B

WSU Vancouver - Engineering amp Computer Science WSU Vancouver - Engineering amp Computer Science

CS558 Advanced Topics in CS558 Advanced Topics in Wireless NetworksWireless Networks

Dr Wenzhan Song

Assistant Professor Computer Science

Wireless Ad Hoc amp Sensor Networks Wireless Ad Hoc amp Sensor Networks MAC Protocol

2

Ethernet uses CSMACDEthernet uses CSMACD

No slots adapter doesnrsquot transmit if it

senses that some other adapter is transmitting that is carrier sense

transmitting adapter aborts when it senses that another adapter is transmitting that is collision detection

Before attempting a retransmission adapter waits a random time that is random access


3

CSMACD (Collision CSMACD (Collision Detection)Detection)

CSMACD carrier sensing deferral as in CSMA collisions detected within short time colliding transmissions aborted reducing channel wastage

collision detection easy in wired LANs measure signal strengths compare

transmitted received signals difficult in wireless LANs receiver shut off while transmitting


4

Ethernet CSMACD algorithmEthernet CSMACD algorithm1 Adaptor receives datagram

from net layer amp creates frame

2 If adapter senses channel idle it starts to transmit frame If it senses channel busy waits until channel idle and then transmits

3 If adapter transmits entire frame without detecting another transmission the adapter is done with frame

4 If adapter detects another transmission while transmitting aborts and sends jam signal

5 After aborting adapter enters exponential backoff after the mth collision adapter chooses a K at random from 012hellip2m-1 Adapter waits K512 bit times and returns to Step 2


5

Ethernetrsquos CSMACD (more)Ethernetrsquos CSMACD (more)

Jam Signal make sure all other transmitters are aware of collision 48 bits

Bit time 1 microsec for 10 Mbps Ethernet for K=1023 wait time is about 50 msec

Exponential Backoff Goal adapt retransmission

attempts to estimated current load

heavy load random wait will be longer

first collision choose K from 01 delay is K 512 bit transmission times

after second collision choose K from 0123hellip

after ten collisions choose K from 01234hellip1023


6


CSMACD can be in one of three states contention transmission or idle


7

CSMACD efficiencyCSMACD efficiency

See equation on textbook page 280 Much better than ALOHA also

decentralized simple and cheap


8

Elements of a wireless networkElements of a wireless network

network infrastructure

wireless hosts laptop PDA IP phone run applications may be stationary

(non-mobile) or mobile

wireless does not always mean mobility


9



base station typically connected

to wired network relay - responsible

for sending packets between wired network and wireless host(s) in its ldquoareardquo

eg cell towers 80211 access points


10



wireless link typically used to

connect mobile(s) to base station

also used as backbone link

multiple access protocol coordinates link access

various data rates transmission distance


11



infrastructure mode base station

connects mobiles into wired network

handoff mobile changes base station providing connection into wired network


12


Ad hoc mode no base stations nodes can only

transmit to other nodes within link coverage

nodes organize themselves into a network route among themselves


13

Wireless Link CharacteristicsWireless Link Characteristics

Differences from wired link hellip

decreased signal strength radio signal attenuates as it propagates through matter (path loss)

interference from other sources standardized wireless network frequencies (eg 24 GHz) shared by other devices (eg phone) devices (motors) interfere as well

multipath propagation radio signal reflects off objects ground arriving ad destination at slightly different times

hellip make communication across (even a point to point) wireless link much more ldquodifficultrdquo


14

Wireless network Wireless network characteristicscharacteristics

Multiple wireless senders and receivers create additional problems (beyond multiple access)

AB

C

Hidden terminal problem B A hear each other B C hear each other A C can not hear each

othermeans A C unaware of their

interference at B

A B C

Arsquos signalstrength

space

Crsquos signalstrength

Signal fading B A hear each other B C hear each other A C can not hear each

other interferring at B


15

Characteristics of selected Characteristics of selected wireless link standardswireless link standards

384 Kbps384 Kbps

56 Kbps56 Kbps

54 Mbps54 Mbps

5-11 Mbps5-11 Mbps

1 Mbps1 Mbps

80215

80211b

80211ag

IS-95 CDMA GSM

UMTSWCDMA CDMA2000

11 p-to-p link

2G

3G

Indoor

10 ndash 30m

Outdoor

50 ndash 200m

Mid rangeoutdoor

200m ndash 4Km

Long rangeoutdoor

5Km ndash 20Km

80216

80216 10-66GHz 80211a 5GHz ISM band80211bg 24GHz ISM band80215 24GHz ISM band


16

IEEE 80211 Wireless LANIEEE 80211 Wireless LAN

80211b 24-2485 GHz

unlicensed radio spectrum

up to 11 Mbps direct sequence

spread spectrum (DSSS) in physical layer

all hosts use same chipping code

widely deployed using base stations

80211a 5-58 GHz range up to 54 Mbps

80211g 24-2485 GHz range up to 54 Mbps

All use CSMACA for multiple access

All have base-station and ad-hoc network versions


17

80211 LAN architecture80211 LAN architecture

wireless host communicates with base station

base station = access point (AP)

Basic Service Set (BSS) (aka ldquocellrdquo) in infrastructure mode contains

wireless hosts access point (AP)

base station ad hoc mode hosts

only

BSS 1

BSS 2

Internet

hub switchor routerAP

AP


18

80211 Channels 80211 Channels associationassociation

80211b 24GHz-2485GHz spectrum divided into 11 channels at different frequencies AP admin chooses frequency for AP interference possible channel can be same as

that chosen by neighboring AP host must associate with an AP

scans channels listening for beacon frames containing APrsquos name (SSID) and MAC address

selects AP to associate with may perform authentication [Chapter 8] will typically run DHCP to get IP address in APrsquos

subnet


19

80211 Wireless LANs80211 Wireless LANs

MAC protocols DCF CSMACA

80211 Frame format and addressing Physical layer issues


20

IEEE 80211 Protocol IEEE 80211 Protocol ArchitectureArchitecture

Point Coordination Function (PCF)

OFDM


21

Media Access ControlMedia Access Control

Distributed wireless foundation MAC (DWFMAC) Distributed access control mechanism Optional centralized control on top

Lower sublayer is distributed coordination function (DCF)

Contention algorithm to provide access to all traffic Asynchronous traffic

Point coordination function (PCF) Centralized MAC algorithm Contention free Built on top of DCF


22

Distributed Coordination Function Distributed Coordination Function (DCF)(DCF)

DCF sublayer uses CSMACA Uses both physical and virtual carrier sensing

1 MACAW(Multiple Access with Collision Avoidance for Wireless) with virtual carrier sensing

2 1-persistent physical carrier sensing No collision detection

Not practical on wireless network Dynamic range of signals very large Transmitting station cannot distinguish incoming weak

signals from noise and effects of own transmission DCF includes delays

Amounts to priority scheme Interframe space


23

CSMACACSMACA

80211 sender1 if sense channel idle for DIFS then

transmit entire frame (no CD)2 if sense channel busy then

start random backoff timetimer counts down while channel idletransmit when timer expiresif no ACK increase random backoff

interval repeat 2

80211 receiver- if frame received OK

return ACK after SIFS (ACK needed due to hidden terminal problem)

sender receiver

DIFS

data

SIFS

ACK


24

Avoiding collisions in Avoiding collisions in CSMACACSMACA

idea allow sender to ldquoreserverdquo channel rather than random access of data frames avoid collisions of long data frames

sender first transmits small request-to-send (RTS) packets to BS using CSMA

RTSs may still collide with each other (but theyrsquore short) BS broadcasts clear-to-send CTS in response to RTS RTS heard by all nodes

sender transmits data frame other stations defer transmissions

Avoid data frame collisions completely using small reservation packets


25

Collision Avoidance RTS-CTS Collision Avoidance RTS-CTS exchangeexchange

APA B

time

RTS(A)RTS(B)

RTS(A)

CTS(A) CTS(A)

DATA (A)

ACK(A) ACK(A)

reservation collision

defer


26

virtual channel sensing in virtual channel sensing in CSMACACSMACA

The use of virtual channel sensing in CSMACA

A B

C D


27

Point Coordination Function Point Coordination Function (PCF)(PCF)

Alternative access method implemented on top of DCF Polling by centralized polling master (point coordinator) Uses PIFS when issuing polls

PIFS smaller than DIFS Can seize medium and lock out all asynchronous traffic while it

issues polls and receives responses Eg wireless network configured so number of stations with

time-sensitive traffic controlled by point coordinator Remaining traffic contends for access using CSMA

Point coordinator polls to stations asking if any frames to send When poll issued polled station may respond using SIFS Once a station has signed up for polling service at a certain

rate it is effectively guaranteed a certain fraction of the bandwidth


28

IEEE 80211 MAC LogicIEEE 80211 MAC Logic


29


Single delay known as interframe space (IFS) Using IFS rules for CSMA

Station with frame senses mediumbull If idle wait to see if remains idle for one IFS If so may

transmit immediatelybull If busy (either initially or becomes busy during IFS)

station defers transmission1 Continue to monitor until current transmission is over2 Once current transmission over delay another IFS

bull If remains idle back off random time and again sensebull If medium still idle station may transmitbull During backoff time if becomes busy backoff

timer is halted and resumes when medium becomes idle

To ensure stability binary exponential backoff used


30

IEEE 80211 MAC Timing Basic Access IEEE 80211 MAC Timing Basic Access MethodMethod


31

Priority Priority Interframe Space Interframe Space ValuesValues

Use three values for IFS SIFS (short IFS)

Shortest IFS For all immediate response actions

Acknowledgment (ACK) Clear to send (CTS) Poll response

PIFS (point coordination function IFS) Midlength IFS Used by the centralized controller in PCF scheme when issuing polls

Takes precedence over normal contention traffic eg DCF Frames using SIFS have precedence over PCF poll

DIFS (distributed coordination function IFS) Longest IFS Used as minimum delay for asynchronous frames contending for

access


32





33

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

80211 frame addressing80211 frame addressing

Address 2 MAC addressof wireless host or AP transmitting this frame

Address 1 MAC addressof wireless host or AP to receive this frame

Address 3 MAC addressof router interface to which AP is attached

Address 4 used only in ad hoc mode


34

Internetrouter

AP

H1 R1

AP MAC addr H1 MAC addr R1 MAC addr

address 1 address 2 address 3

80211 frame

R1 MAC addr AP MAC addr

dest address source address

8023 frame



35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt

Retry RsvdProtocolversion

2 2 4 1 1 1 1 1 11 1

80211 frame more80211 frame more

duration of reserved transmission time (RTSCTS)

frame seq (for reliable ARQ)

frame type(RTS CTS ACK data)


36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1

80211 mobility within same 80211 mobility within same subnetsubnet

router H1 remains in same

IP subnet IP address can remain same

switch which AP is associated with H1

self-learning switch will see frame from H1 and ldquorememberrdquo which switch port can be used to reach H1


37





38



OFDM


39

Wireless Physical Layer Wireless Physical Layer Physical layer conforms to OSI (five options)

1997 80211 infrared FHSS DHSS 1999 80211a OFDM and 80211b HR-DSSS 2001 80211g OFDM

80211 Infrared Two capacities 1 Mbps or 2 Mbps Range is 10 to 20 meters and cannot penetrate walls Does not work outdoors

80211 FHSS (Frequence Hopping Spread Spectrum) Offers good resistance to multipath fading 79 non-overlapping channels each 1 Mhz wide at low end of 24

GHz ISM band Same pseudo-random number generator used by all stations Dwell time min time on channel before hopping (400msec)

Multipath Fading

The deflection of a radio signal off obstacles which can cause interference during signal reception Multipath occurs when a radio signal is received directly by an antenna and later the same signal is received again reflected from a building or mountain Ghosting of a TV signal is a form of muiltipath Under certain conditions two or more of the signals can interfere with each other and create fading (a loss of signal) in the communications link


40

Wireless Physical Layer Wireless Physical Layer 80211 DSSS (Direct Sequence Spread Spectrum)

Spreads signal over entire spectrum using pseudo-random sequence (similar to CDMA see Tanenbaum sec 262)

Each bit transmitted using an 11 chips Barker sequence PSK at 1Mbaud

1 or 2 Mbps 80211a OFDM (Orthogonal Frequency Divisional

Multiplexing) Compatible with European HiperLan2 Good immunity to multipath fading 54Mbps in wider 55 GHz band transmission range is limited Uses 52 FDM channels (48 for data 4 for synchronization) Encoding is complex ( PSM up to 18 Mbps and QAM above this

capacity) Eg at 54Mbps 216 data bits encoded into into 288-bit symbols More difficulty penetrating walls


41

Wireless Physical Layer Wireless Physical Layer

80211b HR-DSSS (High Rate Direct Sequence Spread Spectrum)

11a and 11b shows a split in the standards committee 11b approved and hit the market before 11a Up to 11 Mbps in 24 GHz band using 11 million chipssec Note in this bandwidth all these protocols have to deal with

interference from microwave ovens cordless phones and garage door openers

Range is 7 times greater than 11a 11b and 11a are incompatible


42

Wireless Physical Layer Wireless Physical Layer 80211g OFDM(Orthogonal Frequency Division

Multiplexing) An attempt to combine the best of both 80211a and

80211b Supports bandwidths up to 54 Mbps Uses 24 GHz frequency for greater range Is backward compatible with 80211b


43

Data Link Layer Data Link Layer Road Road MapMap

Data link layer design issues Framing Error Control Reliable data transfer and flow control

Example data link protocols HDLC and PPP

Multiple Access Protocols Static channel allocation Dynamic channel allocation

LAN technologies and their MAC protocols Ethernet WiFi and WiMax and WPAN


44

Broadband WirelessBroadband Wireless

Wireless MAN or Wi-Max IEEE 80216 standard for bridging the ldquolast milerdquo between

ISPs and their customers as replacement for costly-todeploy fiber opticDSLcable modem links (Broadband Wireless Access BWA)

Original PHY-Layer 10-66 GHz line-of-sight connections with fixed directed

outdoor antennas single-carrier TDD or FDD with TDMA in the uplink

In 80216a a second PHY-layer was added to make the standard suitable for residential applications (no line-of-sight more multi-path propagation)

2-11 GHz both licensed and license-exempt non-line-of-sight operation possible support for advanced antenna systems three air interfaces single carrier OFDM with TDMA or OFDMA


45

Comparison of 80211 and Comparison of 80211 and 80216a80216a

IEEE 80211 IEEE 80216a

Spectrum License-exempt (ISM)

License-exempt or licensed

Max Speed 54 Mbps (11a amp g) 70 Mbps

Range 100 m 40 km

QoS None Yes

Coverage Indoor Opt Outdoor Opt

Users Hundreds Thousands

Security WPAWEP Triple-DES (128-bit) and RSA (1024-bit)

Service Levels None Yes


46

The 80216 Protocol StackThe 80216 Protocol Stack

The 80216 Protocol Stack


47

The 80216 Physical LayerThe 80216 Physical Layer

The 80216 transmission environmentUse error-correction code Hamming code


48

The 80216 Physical Layer (2)The 80216 Physical Layer (2)

FDD + TDD

Example Frames and time slots for time division duplexing(TDD)


49

The 80216 MAC Sublayer The 80216 MAC Sublayer ProtocolProtocol

bull Downstream channelbull Base station decide

bull Upstream channelbull Competing uncoordinated subscribersbull Related to QoS issuesbull Four Connection-Oriented Service Classes

bull Constant bit rate service (uncompressed voice)bull Real-time variable bit rate service (compressed

multimedia)bull Non-real-time variable bit rate service (not real time

heavy transmissions large file transfers)bull Best efforts service (everything else)

bull Decided when connection is set up


50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device

Parked device (inactive)P

80215 personal area network80215 personal area network

less than 10 m diameter replacement for cables

(mouse keyboard headphones)

ad hoc no infrastructure masterslaves

slaves request permission to send (to master)

master grants requests 80215 evolved from

Bluetooth specification 24-25 GHz radio band up to 721 kbps


51

Bluetooth HistoryBluetooth History 1994 ndash Ericsson study completevision 1995 ndash Engineering work begins 1997 ndash Intel agrees to collaborate 1998 ndash Bluetooth SIG formed

Ericsson Intel IBM Nokia and Toshiba 1999 ndash Bluetooth Specification 10A

SIG promoter group expanded 3Com Lucent Microsoft amp Motorola

2000 ndash Bluetooth Specification 10B 2000+ adopters 2001 ndash First retail products released Specification 11 2003 ndash Bluetooth Specification 12 2004 ndash Bluetooth Specification 20


52

Special Interest Group

httpswwwbluetoothorg


53

Bluetooth ArchitectureBluetooth Architecture

Piconet Basic unit of Bluetooth networking Master and one to seven slave devices Master determines channel (hop frequency)

and phase Scatternet

Inter-piconet communication Device in one piconet may exist as master or

slave in another piconet Allows many devices to share same area Makes efficient use of bandwidth


54

PiconetPiconet Before a connection is created

a device is in ldquostandbyrdquo mode periodically listen for messages every 128 sec

Devices are connected in an ad hoc fashion called piconet

8 active devices in a piconet each piconet has 1 master and up to 7 slaves

Other devices within the piconet will be considered ldquoparkedrdquo (255 parked)

Parked devices as well as the slaves are synchronized to the master

M = MasterS = Slave

P = ParkedSB = Standby

M

S

P

SB

S

S

P

P

SB


55

ScatternetScatternet

Linking of multiple co-located piconets through the sharing of common master or slave devices

A device can be slave in one piconet and master of another No device can be master of two piconets

M=MasterS=SlaveP=ParkedSB=Standby

M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56

ScatternetsScatternets


57

Bluetooth ApplicationsBluetooth Applications

Originally conceived as a cable replacement technology Eliminates need for numerous cable attachments for connection

Other usage models began to develop Personal Area Network (PAN) Datavoice access points Ad-hoc networks


58

Core Bluetooth ProductsCore Bluetooth Products

Notebook PCs amp desktop computers

Printers PDAs Other handheld devices Cell phones Wireless periperals

Headsets Cameras

Access Points

CD Player TVVCRDVD Telephone Answering

Devices Cordless Phones Cars


59

Costs of Bluetooth ChipsCosts of Bluetooth Chips

$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60

Bluetooth Standards Bluetooth Standards DocumentsDocuments

Core specifications Details of various layers of Bluetooth protocol

architecture Profile specifications

Use of Bluetooth technology to support various applications


61

Bluetooth Protocol StackBluetooth Protocol Stack

The 80215 version of the Bluetooth protocol architecture


62

Protocol ArchitectureProtocol Architecture

Bluetooth is a layered protocol architecture Core protocols Cable replacement and telephony control

protocols Adopted protocols

Core protocols Radio Baseband Link manager protocol (LMP) Logical link control and adaptation protocol

(L2CAP) Service discovery protocol (SDP)


63

Bluetooth Radio LayerBluetooth Radio Layer

24 GHz ISM (Industrial Scientific Medical) Open Band

Globally free available frequency 79 MHz of spectrum = 79 channels Frequency Hopping (FHSS Frequency Hopping Spread

Spectrum) amp Time Division Duplex (1600 hopssecond) Disadvantage interfere with IEEE 80211b products


64

Unlicensed Radio SpectrumUnlicensed Radio Spectrum

902 Mhz

928 Mhz

26 Mhz 835 Mhz 125 Mhz

24 Ghz

24835 Ghz5725 Ghz

5785 Ghz

cordless phonesbaby monitorsWireless LANs

80211BluetoothMicrowave oven

80211aHyperLan

33cm 12cm 5cm


65

Frequency HoppingFrequency Hopping

Total bandwidth divided into 1MHz physical channels

FH occurs by jumping from one channel to another in pseudorandom sequence

Hopping sequence shared with all devices on piconet


66


frequency hopping spread spectrum 2402 GHz + k MHz k=0 hellip 78 1600 hops per second

1Mhz

1 2 3 79

835 Mhz


67

Radio SpecificationRadio Specification Low Power Consumption

Three power classes defined with max output power from 1 mW (Class 3) to 100 mW (Class 1)

Class 1 Outputs 100 mW for maximum range Power control mandatory Provides greatest distance

Class 2 Outputs 24 mW at maximum Power control optional

Class 3 Nominal output is 1 mW Lowest power

Short Range 10-100 Meter Class 1 ndash 100 meter (300 feet) Class 2 ndash 20 meter (60 feet) Class 3 ndash 10 meter (30 feet)


68

Baseband LayerBaseband Layer

MAC sublayer + some elements of physical layer

Deal with how the master controls time slots and how these slots are grouped into frames

Piconet access Bluetooth devices use time division duplex

(TDD) Access technique is TDMA


69

QuizQuiz

Describe Non-persistent CSMA and p-Persistent CSMA (including 1-persistent)


70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


2

Ethernet uses CSMACDEthernet uses CSMACD

No slots adapter doesnrsquot transmit if it

senses that some other adapter is transmitting that is carrier sense

transmitting adapter aborts when it senses that another adapter is transmitting that is collision detection

Before attempting a retransmission adapter waits a random time that is random access


3






4








5











6




7





8







9








10









11







12






13








14



AB

C



interference at B

A B C


space





15


384 Kbps384 Kbps

56 Kbps56 Kbps

54 Mbps54 Mbps

5-11 Mbps5-11 Mbps

1 Mbps1 Mbps

80215

80211b

80211ag

IS-95 CDMA GSM

UMTSWCDMA CDMA2000

11 p-to-p link

2G

3G

Indoor

10 ndash 30m

Outdoor

50 ndash 200m

Mid rangeoutdoor

200m ndash 4Km

Long rangeoutdoor

5Km ndash 20Km

80216



16


80211b 24-2485 GHz











17







only

BSS 1

BSS 2

Internet


AP


18






subnet


19





20



OFDM


21







22









23

CSMACACSMACA




interval repeat 2



sender receiver

DIFS

data

SIFS

ACK


24








25


APA B

time

RTS(A)RTS(B)

RTS(A)

CTS(A) CTS(A)

DATA (A)

ACK(A) ACK(A)


defer


26



A B

C D


27









28



29










30



31








access


32





33

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol







34

Internetrouter

AP

H1 R1



80211 frame



8023 frame



35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt


2 2 4 1 1 1 1 1 11 1






36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


3






4








5











6




7





8







9








10









11







12






13








14



AB

C



interference at B

A B C


space





15


384 Kbps384 Kbps

56 Kbps56 Kbps

54 Mbps54 Mbps

5-11 Mbps5-11 Mbps

1 Mbps1 Mbps

80215

80211b

80211ag

IS-95 CDMA GSM

UMTSWCDMA CDMA2000

11 p-to-p link

2G

3G

Indoor

10 ndash 30m

Outdoor

50 ndash 200m

Mid rangeoutdoor

200m ndash 4Km

Long rangeoutdoor

5Km ndash 20Km

80216



16


80211b 24-2485 GHz











17







only

BSS 1

BSS 2

Internet


AP


18






subnet


19





20



OFDM


21







22









23

CSMACACSMACA




interval repeat 2



sender receiver

DIFS

data

SIFS

ACK


24








25


APA B

time

RTS(A)RTS(B)

RTS(A)

CTS(A) CTS(A)

DATA (A)

ACK(A) ACK(A)


defer


26



A B

C D


27









28



29










30



31








access


32





33

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol







34

Internetrouter

AP

H1 R1



80211 frame



8023 frame



35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt


2 2 4 1 1 1 1 1 11 1






36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


4








5











6




7





8







9








10









11







12






13








14



AB

C



interference at B

A B C


space





15


384 Kbps384 Kbps

56 Kbps56 Kbps

54 Mbps54 Mbps

5-11 Mbps5-11 Mbps

1 Mbps1 Mbps

80215

80211b

80211ag

IS-95 CDMA GSM

UMTSWCDMA CDMA2000

11 p-to-p link

2G

3G

Indoor

10 ndash 30m

Outdoor

50 ndash 200m

Mid rangeoutdoor

200m ndash 4Km

Long rangeoutdoor

5Km ndash 20Km

80216



16


80211b 24-2485 GHz











17







only

BSS 1

BSS 2

Internet


AP


18






subnet


19





20



OFDM


21







22









23

CSMACACSMACA




interval repeat 2



sender receiver

DIFS

data

SIFS

ACK


24








25


APA B

time

RTS(A)RTS(B)

RTS(A)

CTS(A) CTS(A)

DATA (A)

ACK(A) ACK(A)


defer


26



A B

C D


27









28



29










30



31








access


32





33

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol







34

Internetrouter

AP

H1 R1



80211 frame



8023 frame



35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt


2 2 4 1 1 1 1 1 11 1






36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


5











6




7





8







9








10









11







12






13








14



AB

C



interference at B

A B C


space





15


384 Kbps384 Kbps

56 Kbps56 Kbps

54 Mbps54 Mbps

5-11 Mbps5-11 Mbps

1 Mbps1 Mbps

80215

80211b

80211ag

IS-95 CDMA GSM

UMTSWCDMA CDMA2000

11 p-to-p link

2G

3G

Indoor

10 ndash 30m

Outdoor

50 ndash 200m

Mid rangeoutdoor

200m ndash 4Km

Long rangeoutdoor

5Km ndash 20Km

80216



16


80211b 24-2485 GHz











17







only

BSS 1

BSS 2

Internet


AP


18






subnet


19





20



OFDM


21







22









23

CSMACACSMACA




interval repeat 2



sender receiver

DIFS

data

SIFS

ACK


24








25


APA B

time

RTS(A)RTS(B)

RTS(A)

CTS(A) CTS(A)

DATA (A)

ACK(A) ACK(A)


defer


26



A B

C D


27









28



29










30



31








access


32





33

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol







34

Internetrouter

AP

H1 R1



80211 frame



8023 frame



35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt


2 2 4 1 1 1 1 1 11 1






36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


6




7





8







9








10









11







12






13








14



AB

C



interference at B

A B C


space





15


384 Kbps384 Kbps

56 Kbps56 Kbps

54 Mbps54 Mbps

5-11 Mbps5-11 Mbps

1 Mbps1 Mbps

80215

80211b

80211ag

IS-95 CDMA GSM

UMTSWCDMA CDMA2000

11 p-to-p link

2G

3G

Indoor

10 ndash 30m

Outdoor

50 ndash 200m

Mid rangeoutdoor

200m ndash 4Km

Long rangeoutdoor

5Km ndash 20Km

80216



16


80211b 24-2485 GHz











17







only

BSS 1

BSS 2

Internet


AP


18






subnet


19





20



OFDM


21







22









23

CSMACACSMACA




interval repeat 2



sender receiver

DIFS

data

SIFS

ACK


24








25


APA B

time

RTS(A)RTS(B)

RTS(A)

CTS(A) CTS(A)

DATA (A)

ACK(A) ACK(A)


defer


26



A B

C D


27









28



29










30



31








access


32





33

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol







34

Internetrouter

AP

H1 R1



80211 frame



8023 frame



35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt


2 2 4 1 1 1 1 1 11 1






36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


7





8







9








10









11







12






13








14



AB

C



interference at B

A B C


space





15


384 Kbps384 Kbps

56 Kbps56 Kbps

54 Mbps54 Mbps

5-11 Mbps5-11 Mbps

1 Mbps1 Mbps

80215

80211b

80211ag

IS-95 CDMA GSM

UMTSWCDMA CDMA2000

11 p-to-p link

2G

3G

Indoor

10 ndash 30m

Outdoor

50 ndash 200m

Mid rangeoutdoor

200m ndash 4Km

Long rangeoutdoor

5Km ndash 20Km

80216



16


80211b 24-2485 GHz











17







only

BSS 1

BSS 2

Internet


AP


18






subnet


19





20



OFDM


21







22









23

CSMACACSMACA




interval repeat 2



sender receiver

DIFS

data

SIFS

ACK


24








25


APA B

time

RTS(A)RTS(B)

RTS(A)

CTS(A) CTS(A)

DATA (A)

ACK(A) ACK(A)


defer


26



A B

C D


27









28



29










30



31








access


32





33

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol







34

Internetrouter

AP

H1 R1



80211 frame



8023 frame



35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt


2 2 4 1 1 1 1 1 11 1






36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


8







9








10









11







12






13








14



AB

C



interference at B

A B C


space





15


384 Kbps384 Kbps

56 Kbps56 Kbps

54 Mbps54 Mbps

5-11 Mbps5-11 Mbps

1 Mbps1 Mbps

80215

80211b

80211ag

IS-95 CDMA GSM

UMTSWCDMA CDMA2000

11 p-to-p link

2G

3G

Indoor

10 ndash 30m

Outdoor

50 ndash 200m

Mid rangeoutdoor

200m ndash 4Km

Long rangeoutdoor

5Km ndash 20Km

80216



16


80211b 24-2485 GHz











17







only

BSS 1

BSS 2

Internet


AP


18






subnet


19





20



OFDM


21







22









23

CSMACACSMACA




interval repeat 2



sender receiver

DIFS

data

SIFS

ACK


24








25


APA B

time

RTS(A)RTS(B)

RTS(A)

CTS(A) CTS(A)

DATA (A)

ACK(A) ACK(A)


defer


26



A B

C D


27









28



29










30



31








access


32





33

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol







34

Internetrouter

AP

H1 R1



80211 frame



8023 frame



35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt


2 2 4 1 1 1 1 1 11 1






36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


9








10









11







12






13








14



AB

C



interference at B

A B C


space





15


384 Kbps384 Kbps

56 Kbps56 Kbps

54 Mbps54 Mbps

5-11 Mbps5-11 Mbps

1 Mbps1 Mbps

80215

80211b

80211ag

IS-95 CDMA GSM

UMTSWCDMA CDMA2000

11 p-to-p link

2G

3G

Indoor

10 ndash 30m

Outdoor

50 ndash 200m

Mid rangeoutdoor

200m ndash 4Km

Long rangeoutdoor

5Km ndash 20Km

80216



16


80211b 24-2485 GHz











17







only

BSS 1

BSS 2

Internet


AP


18






subnet


19





20



OFDM


21







22









23

CSMACACSMACA




interval repeat 2



sender receiver

DIFS

data

SIFS

ACK


24








25


APA B

time

RTS(A)RTS(B)

RTS(A)

CTS(A) CTS(A)

DATA (A)

ACK(A) ACK(A)


defer


26



A B

C D


27









28



29










30



31








access


32





33

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol







34

Internetrouter

AP

H1 R1



80211 frame



8023 frame



35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt


2 2 4 1 1 1 1 1 11 1






36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


10









11







12






13








14



AB

C



interference at B

A B C


space





15


384 Kbps384 Kbps

56 Kbps56 Kbps

54 Mbps54 Mbps

5-11 Mbps5-11 Mbps

1 Mbps1 Mbps

80215

80211b

80211ag

IS-95 CDMA GSM

UMTSWCDMA CDMA2000

11 p-to-p link

2G

3G

Indoor

10 ndash 30m

Outdoor

50 ndash 200m

Mid rangeoutdoor

200m ndash 4Km

Long rangeoutdoor

5Km ndash 20Km

80216



16


80211b 24-2485 GHz











17







only

BSS 1

BSS 2

Internet


AP


18






subnet


19





20



OFDM


21







22









23

CSMACACSMACA




interval repeat 2



sender receiver

DIFS

data

SIFS

ACK


24








25


APA B

time

RTS(A)RTS(B)

RTS(A)

CTS(A) CTS(A)

DATA (A)

ACK(A) ACK(A)


defer


26



A B

C D


27









28



29










30



31








access


32





33

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol







34

Internetrouter

AP

H1 R1



80211 frame



8023 frame



35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt


2 2 4 1 1 1 1 1 11 1






36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


11







12






13








14



AB

C



interference at B

A B C


space





15


384 Kbps384 Kbps

56 Kbps56 Kbps

54 Mbps54 Mbps

5-11 Mbps5-11 Mbps

1 Mbps1 Mbps

80215

80211b

80211ag

IS-95 CDMA GSM

UMTSWCDMA CDMA2000

11 p-to-p link

2G

3G

Indoor

10 ndash 30m

Outdoor

50 ndash 200m

Mid rangeoutdoor

200m ndash 4Km

Long rangeoutdoor

5Km ndash 20Km

80216



16


80211b 24-2485 GHz











17







only

BSS 1

BSS 2

Internet


AP


18






subnet


19





20



OFDM


21







22









23

CSMACACSMACA




interval repeat 2



sender receiver

DIFS

data

SIFS

ACK


24








25


APA B

time

RTS(A)RTS(B)

RTS(A)

CTS(A) CTS(A)

DATA (A)

ACK(A) ACK(A)


defer


26



A B

C D


27









28



29










30



31








access


32





33

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol







34

Internetrouter

AP

H1 R1



80211 frame



8023 frame



35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt


2 2 4 1 1 1 1 1 11 1






36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


12






13








14



AB

C



interference at B

A B C


space





15


384 Kbps384 Kbps

56 Kbps56 Kbps

54 Mbps54 Mbps

5-11 Mbps5-11 Mbps

1 Mbps1 Mbps

80215

80211b

80211ag

IS-95 CDMA GSM

UMTSWCDMA CDMA2000

11 p-to-p link

2G

3G

Indoor

10 ndash 30m

Outdoor

50 ndash 200m

Mid rangeoutdoor

200m ndash 4Km

Long rangeoutdoor

5Km ndash 20Km

80216



16


80211b 24-2485 GHz











17







only

BSS 1

BSS 2

Internet


AP


18






subnet


19





20



OFDM


21







22









23

CSMACACSMACA




interval repeat 2



sender receiver

DIFS

data

SIFS

ACK


24








25


APA B

time

RTS(A)RTS(B)

RTS(A)

CTS(A) CTS(A)

DATA (A)

ACK(A) ACK(A)


defer


26



A B

C D


27









28



29










30



31








access


32





33

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol







34

Internetrouter

AP

H1 R1



80211 frame



8023 frame



35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt


2 2 4 1 1 1 1 1 11 1






36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


13








14



AB

C



interference at B

A B C


space





15


384 Kbps384 Kbps

56 Kbps56 Kbps

54 Mbps54 Mbps

5-11 Mbps5-11 Mbps

1 Mbps1 Mbps

80215

80211b

80211ag

IS-95 CDMA GSM

UMTSWCDMA CDMA2000

11 p-to-p link

2G

3G

Indoor

10 ndash 30m

Outdoor

50 ndash 200m

Mid rangeoutdoor

200m ndash 4Km

Long rangeoutdoor

5Km ndash 20Km

80216



16


80211b 24-2485 GHz











17







only

BSS 1

BSS 2

Internet


AP


18






subnet


19





20



OFDM


21







22









23

CSMACACSMACA




interval repeat 2



sender receiver

DIFS

data

SIFS

ACK


24








25


APA B

time

RTS(A)RTS(B)

RTS(A)

CTS(A) CTS(A)

DATA (A)

ACK(A) ACK(A)


defer


26



A B

C D


27









28



29










30



31








access


32





33

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol







34

Internetrouter

AP

H1 R1



80211 frame



8023 frame



35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt


2 2 4 1 1 1 1 1 11 1






36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


14



AB

C



interference at B

A B C


space





15


384 Kbps384 Kbps

56 Kbps56 Kbps

54 Mbps54 Mbps

5-11 Mbps5-11 Mbps

1 Mbps1 Mbps

80215

80211b

80211ag

IS-95 CDMA GSM

UMTSWCDMA CDMA2000

11 p-to-p link

2G

3G

Indoor

10 ndash 30m

Outdoor

50 ndash 200m

Mid rangeoutdoor

200m ndash 4Km

Long rangeoutdoor

5Km ndash 20Km

80216



16


80211b 24-2485 GHz











17







only

BSS 1

BSS 2

Internet


AP


18






subnet


19





20



OFDM


21







22









23

CSMACACSMACA




interval repeat 2



sender receiver

DIFS

data

SIFS

ACK


24








25


APA B

time

RTS(A)RTS(B)

RTS(A)

CTS(A) CTS(A)

DATA (A)

ACK(A) ACK(A)


defer


26



A B

C D


27









28



29










30



31








access


32





33

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol







34

Internetrouter

AP

H1 R1



80211 frame



8023 frame



35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt


2 2 4 1 1 1 1 1 11 1






36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


15


384 Kbps384 Kbps

56 Kbps56 Kbps

54 Mbps54 Mbps

5-11 Mbps5-11 Mbps

1 Mbps1 Mbps

80215

80211b

80211ag

IS-95 CDMA GSM

UMTSWCDMA CDMA2000

11 p-to-p link

2G

3G

Indoor

10 ndash 30m

Outdoor

50 ndash 200m

Mid rangeoutdoor

200m ndash 4Km

Long rangeoutdoor

5Km ndash 20Km

80216



16


80211b 24-2485 GHz











17







only

BSS 1

BSS 2

Internet


AP


18






subnet


19





20



OFDM


21







22









23

CSMACACSMACA




interval repeat 2



sender receiver

DIFS

data

SIFS

ACK


24








25


APA B

time

RTS(A)RTS(B)

RTS(A)

CTS(A) CTS(A)

DATA (A)

ACK(A) ACK(A)


defer


26



A B

C D


27









28



29










30



31








access


32





33

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol







34

Internetrouter

AP

H1 R1



80211 frame



8023 frame



35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt


2 2 4 1 1 1 1 1 11 1






36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


16


80211b 24-2485 GHz











17







only

BSS 1

BSS 2

Internet


AP


18






subnet


19





20



OFDM


21







22









23

CSMACACSMACA




interval repeat 2



sender receiver

DIFS

data

SIFS

ACK


24








25


APA B

time

RTS(A)RTS(B)

RTS(A)

CTS(A) CTS(A)

DATA (A)

ACK(A) ACK(A)


defer


26



A B

C D


27









28



29










30



31








access


32





33

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol







34

Internetrouter

AP

H1 R1



80211 frame



8023 frame



35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt


2 2 4 1 1 1 1 1 11 1






36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


17







only

BSS 1

BSS 2

Internet


AP


18






subnet


19





20



OFDM


21







22









23

CSMACACSMACA




interval repeat 2



sender receiver

DIFS

data

SIFS

ACK


24








25


APA B

time

RTS(A)RTS(B)

RTS(A)

CTS(A) CTS(A)

DATA (A)

ACK(A) ACK(A)


defer


26



A B

C D


27









28



29










30



31








access


32





33

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol







34

Internetrouter

AP

H1 R1



80211 frame



8023 frame



35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt


2 2 4 1 1 1 1 1 11 1






36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


18






subnet


19





20



OFDM


21







22









23

CSMACACSMACA




interval repeat 2



sender receiver

DIFS

data

SIFS

ACK


24








25


APA B

time

RTS(A)RTS(B)

RTS(A)

CTS(A) CTS(A)

DATA (A)

ACK(A) ACK(A)


defer


26



A B

C D


27









28



29










30



31








access


32





33

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol







34

Internetrouter

AP

H1 R1



80211 frame



8023 frame



35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt


2 2 4 1 1 1 1 1 11 1






36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


19





20



OFDM


21







22









23

CSMACACSMACA




interval repeat 2



sender receiver

DIFS

data

SIFS

ACK


24








25


APA B

time

RTS(A)RTS(B)

RTS(A)

CTS(A) CTS(A)

DATA (A)

ACK(A) ACK(A)


defer


26



A B

C D


27









28



29










30



31








access


32





33

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol







34

Internetrouter

AP

H1 R1



80211 frame



8023 frame



35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt


2 2 4 1 1 1 1 1 11 1






36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


20



OFDM


21







22









23

CSMACACSMACA




interval repeat 2



sender receiver

DIFS

data

SIFS

ACK


24








25


APA B

time

RTS(A)RTS(B)

RTS(A)

CTS(A) CTS(A)

DATA (A)

ACK(A) ACK(A)


defer


26



A B

C D


27









28



29










30



31








access


32





33

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol







34

Internetrouter

AP

H1 R1



80211 frame



8023 frame



35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt


2 2 4 1 1 1 1 1 11 1






36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


21







22









23

CSMACACSMACA




interval repeat 2



sender receiver

DIFS

data

SIFS

ACK


24








25


APA B

time

RTS(A)RTS(B)

RTS(A)

CTS(A) CTS(A)

DATA (A)

ACK(A) ACK(A)


defer


26



A B

C D


27









28



29










30



31








access


32





33

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol







34

Internetrouter

AP

H1 R1



80211 frame



8023 frame



35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt


2 2 4 1 1 1 1 1 11 1






36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


22









23

CSMACACSMACA




interval repeat 2



sender receiver

DIFS

data

SIFS

ACK


24








25


APA B

time

RTS(A)RTS(B)

RTS(A)

CTS(A) CTS(A)

DATA (A)

ACK(A) ACK(A)


defer


26



A B

C D


27









28



29










30



31








access


32





33

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol







34

Internetrouter

AP

H1 R1



80211 frame



8023 frame



35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt


2 2 4 1 1 1 1 1 11 1






36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


23

CSMACACSMACA




interval repeat 2



sender receiver

DIFS

data

SIFS

ACK


24








25


APA B

time

RTS(A)RTS(B)

RTS(A)

CTS(A) CTS(A)

DATA (A)

ACK(A) ACK(A)


defer


26



A B

C D


27









28



29










30



31








access


32





33

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol







34

Internetrouter

AP

H1 R1



80211 frame



8023 frame



35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt


2 2 4 1 1 1 1 1 11 1






36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


24








25


APA B

time

RTS(A)RTS(B)

RTS(A)

CTS(A) CTS(A)

DATA (A)

ACK(A) ACK(A)


defer


26



A B

C D


27









28



29










30



31








access


32





33

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol







34

Internetrouter

AP

H1 R1



80211 frame



8023 frame



35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt


2 2 4 1 1 1 1 1 11 1






36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


25


APA B

time

RTS(A)RTS(B)

RTS(A)

CTS(A) CTS(A)

DATA (A)

ACK(A) ACK(A)


defer


26



A B

C D


27









28



29










30



31








access


32





33

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol







34

Internetrouter

AP

H1 R1



80211 frame



8023 frame



35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt


2 2 4 1 1 1 1 1 11 1






36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


26



A B

C D


27









28



29










30



31








access


32





33

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol







34

Internetrouter

AP

H1 R1



80211 frame



8023 frame



35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt


2 2 4 1 1 1 1 1 11 1






36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


27









28



29










30



31








access


32





33

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol







34

Internetrouter

AP

H1 R1



80211 frame



8023 frame



35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt


2 2 4 1 1 1 1 1 11 1






36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


28



29










30



31








access


32





33

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol







34

Internetrouter

AP

H1 R1



80211 frame



8023 frame



35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt


2 2 4 1 1 1 1 1 11 1






36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


29










30



31








access


32





33

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol







34

Internetrouter

AP

H1 R1



80211 frame



8023 frame



35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt


2 2 4 1 1 1 1 1 11 1






36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


30



31








access


32





33

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol







34

Internetrouter

AP

H1 R1



80211 frame



8023 frame



35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt


2 2 4 1 1 1 1 1 11 1






36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


31








access


32





33

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol







34

Internetrouter

AP

H1 R1



80211 frame



8023 frame



35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt


2 2 4 1 1 1 1 1 11 1






36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


32





33

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol







34

Internetrouter

AP

H1 R1



80211 frame



8023 frame



35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt


2 2 4 1 1 1 1 1 11 1






36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


33

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol







34

Internetrouter

AP

H1 R1



80211 frame



8023 frame



35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt


2 2 4 1 1 1 1 1 11 1






36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


34

Internetrouter

AP

H1 R1



80211 frame



8023 frame



35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt


2 2 4 1 1 1 1 1 11 1






36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


35

framecontrol

durationaddress

1address

2address

4address

3payload CRC

2 2 6 6 6 2 6 0 - 2312 4

seqcontrol

TypeFromAP

SubtypeToAP

More frag

WEPMoredata

Powermgt


2 2 4 1 1 1 1 1 11 1






36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


36

hub or switch

AP 2

AP 1

H1 BBS 2

BBS 1







37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


37





38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


38



OFDM


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


39






Multipath Fading



40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


40








41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


41







42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


42





43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


43







44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


44









45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


45






Range 100 m 40 km

QoS None Yes






46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


46




47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


47




48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


48


FDD + TDD



49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


49









50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


50

Mradius ofcoverage

S

SS

P

P

P

P

M

S

Master device

Slave device










51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


51






52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


52




53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


53







54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


54







M = MasterS = Slave


M

S

P

SB

S

S

P

P

SB


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


55





M

S

P

SB

S

S

P

P

SB

M

S

S

P

SB

Piconets


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


56



57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


57





58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


58




Headsets Cameras

Access Points




59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


59


$1500

$750

$450$315 $252 $202

$000

$200

$400

$600

$800

$1000

$1200

$1400

$1600

2000 2001 2002 2003 2004 2005


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


60






61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


61




62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


62







63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


63






64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


64


902 Mhz

928 Mhz


24 Ghz

24835 Ghz5725 Ghz

5785 Ghz



80211aHyperLan

33cm 12cm 5cm


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


65






66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


66



1Mhz

1 2 3 79

835 Mhz


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


67








68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


68







69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


69

QuizQuiz



70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


70

QuizQuiz

Describe CSMACD


71

QuizQuiz

Describe CSMACA


71

QuizQuiz

Describe CSMACA

B

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