NDSL Lab. CSIE, CGU - 1 6-1. Bluetooth Architecture Overview.

NDSL Lab. CSIE, CGU - 1

6-1. Bluetooth Architecture Overview


Agenda

• Who is Bluetooth?– History and Background

• What does Bluetooth do for you?– Usage Model

• What is Bluetooth?– Compliance, compatibility

• What does Bluetooth do?– Technical points

• Architectural Overview of Bluetooth


Who is Bluetooth?

• Harald Blaatand “Bluetooth” II

• King of Denmark 940-981– Son of Gorm the Old (King of Denmark) and Thyra Da

nebod (daughter of King Ethelred of England)

• This is one of two Runic stones erected in his capitol city of Jelling (central Jutland)

• The stone’s inscription (“runes”) say: Harald controlled Denmark and No

rway Harald thinks “notebooks” and “cel

lular phones” should seamlessly communicate


Bluetooth Background

• 1997. - Designed by Ericsson

• 1998.2 - Established the Special interest group (form SIG 1) Ericsson, Nokia, IBM, Toshiba, Intel

• 1998.5 - Bluetooth Consortium is established formally.

• 1999.7 - Bluetooth v1.0beta Core Specification and Foundation Profile

• 1999.12 - Lucent、 3Com、Motorola、Microsoft (form SIG 2) • 2001.2 - Bluetooth v1.1

• 2002 – IEEE 802.15 WPAN

IEEE 802.15.1 Wireless Personal Area Networks (Bluetooth)IEEE 802.15.1 Wireless Personal Area Networks (Bluetooth) IEEE 802.15.2 CoexistenceIEEE 802.15.2 Coexistence IEEE 802.15.3 WPAN Higher RateIEEE 802.15.3 WPAN Higher Rate IEEE 802.15.4 WPAN Low RateIEEE 802.15.4 WPAN Low Rate


Bluetooth Background

Bluetooth SIG代表性成員（按產業別分類）

半導體電信電腦與周邊消費性電子網路汽車和其他 Fujitsu Hewlett-Packard Hitachi Semi IBM Intel LSI Logic Mitsubishi Motorola NEC Philsar PrairieComm Philips Samsung Silicon Wave TI Toshiba …Etc.

Alcatel AT&T Wireless British Telecom Daewoo Telecom Ericsson France Telecom Hitachi LG Telecom Motorola Nokia NTT DoKoMo Taiwan Telcom Symbian Sprint PCS Qualcomm

Acer Canon Compaq Dell Computer Gateway 200 Hitachi IBM NCR NEC Palm Ricoh Seiko Epson

Canon Casio Fuji Photo Hitachi LG Electronics Nokia Philips Radio Shack Samsung Sanyo Sharp Sony Toshiba

3Com Broadcom Harris Hitachi Intel Lucent Nortel Networks Siemens AG Xircom

BMW British Airways Federal Express Ford Harris Saab Tektronix Thomson Tokyo Gas Co. Volvo

資料來源：Bluetooth SIG，2000年 1月


Personal Ad-hoc NetworksPersonal Ad-hoc Networks

Cable Cable ReplacementReplacement

Landline

Data/Voice Data/Voice Access PointsAccess Points

(internet access)(internet access)

What does Bluetooth do for you?

three major applicationsthree major applications

most important in most important in voice applicationsvoice applications


Usage Model (Ultimate Headset)


Usage Model (Ultimate Headset)

• Keep your hands free for– Car– Office– Road


Usage Model (Automatic Synchronizer)

• Background Synchronization– PDA– Cellular Phone– Notebook


Usage Model (Three in One Phone)

• Intercom (Walki Talki)• Cordless• Cellular


Usage Model (Three in One Phone)

• Office (No telephone charge)• Home (Fixed line charge)• Outdoor (Mobile phone charge)


Usage Model (Remote Control &Transmission)


Usage Model (Conference Scenario)

• Conference Table– Share and exchange data


Usage Model (killer application)


Key Characteristics

• Low cost– Market consideration

• Low power consumption– Portable device consideration– Short Range

• Unlicensed Used – ISM band used

• Robust operation– Fast frequency hopping– Short packet length

• Multiple links

• Mixed voice and data

• Sized 0.5 squire inches


Mobile = Battery life

• Low power consumption*– Standby current < 0.3 mA

3 months– Voice mode 8-30 mA

75 hours

– Data mode average 5 mA

(0.3-30mA, 20 kbit/s, 25%)

120 hours

• Low Power Architecture– Programmable data length (else radio sleeps)

– Hold and Park modes 60 µA (rough)

» Devices connected but not participating

» Hold retains AMA address, Park releases AMA, gets PMA address

» Device can participate within 2 ms


Bluetooth Specifications

(Single chip with RS-232,USB or PC card interface)

RF

Baseband

AudioLink Manager

L2CAP

Data

SDP RFCOMM

IP

Con

trol

Applications

Bluetooth chip

Firmware

Applications


Bluetooth Certifications

RF

Baseband

AudioLink Manager

L2CAP

Data

SDP RFCOMM

IP

Con

trol

Applications

Basic Layer Certification

Application Framework Certification

HCI: Host Controller Interface


Host Control Interface (HCI) (1/3)

Program

Profile Spec

L2CAPAudio Host

HCI (Host control Interface)

HCI (Host control Interface)

Baseband

LMPAudio

RF

Bluetooth chip


HCI (2/3)

HCI

Bluetooth Host

Bluetooth Module

HCI Transport Firmware

Host Drives and Applications

Bluetooth HCI Transport driver

(USB, PC Card, PCI)

Transport Bus

Bluetooth HCI driver

Bluetooth Host Controller

Link Manager

Bluetooth Radio

Bluetooth Baseband

HCI : Host Controller Interface provides a common interfac

e between the bluetooth host and the bluetooth module.


HCI (3/3)

– All HCI transactions are framed in packets:– Commands– Event– Data (ACL)– Data (SCO)


Bluetooth Products

• Blue-Dongle• Blue-Connect• BluePort• Bluetooth printer• Bluetooth Modem• Etc.,


BT Trend (1/2)

• 2 chips solution– RF transceiver

– Baseband BB chip

• integrated single chip (BB+RF) solution will be provided

• Chip design house co-work with software design company to provide total solution of bluetooth technology


BT Trend (2/2)

2-chip

Single-chip

Cost

Year

BB RF

$30

BB+RF

$10

Host+BB+RF

$4

HeadsetVersion

Full BluetoothPerformance Data Only

Version

2000 2001 2003

Host+RF

?

Single-chip

Soft. modem


Bluetooth Module• CPU core : ARM, 8051, MIPS, etc.,

HOST

RFTransceiver


Bluetooth Module• Software modem is possible nowaday

HOST


RF Transceiver


Bluetooth Specifications

• 2.4 GHz ISM Unlicensed band• Microwave ovens also use this band• Frequency Hopping Spread Spectrum

– Avoid interference– 23/79 channels– 1 MHz per channel– 1 Mbps link rate (GFSK modulation)– Fast frequency hopping and short data packets avoids

interference» Nominally hops at 16001600 times a second (vs. 2.5 hops/sec in IEEE

802.11)» 625us625us per hop (366us366us for data only)» 3200 times a second during inquiry and paging modes

• Multiple uncoordinated networks may exist and cause interference– CVSD (Continuous Variable Slope Delta Modulation) voice

coding (FEC) enables operation at high bit error rates


ISM Unlicensed Band

2.4GHz

2.402

Guard band Guard band

2.48 2.483

2.402-2.480 GHz79 hopping channels

ISM unlicensed band

Licensedband

• 79 channels in 2.4GHz (in USA and most Europe)

Licensedband


Frequency Range

. . .

1MHz

1 2 3 79

83.5 MHz

• 2.4GHz ISM Frequency Range

Country Frequency Range RF Channels Europe* & USA 2400 – 2483.5 MHz f=2402 + k MHz k=0,…,78 Japan 2471 – 2497 MHz f=2473 + k MHz k=0,…,22 Spain 2445 – 2475 MHz f=2449 + k MHz k=0,…,22 France 2446.5 – 2483.5 MHz f=2454 + k MHz k=0,…,22


Transmit Power

• transmit power and range 0 dbm (up to 20dbm with power control) 10-100 m

PowerClass

Max Output

Min Output

PowerControl

1100mW(20dBm)

1mW(0dB)

-4db/timeMax twice

22.5mW(4dBm)

0.25mW(-6dBm)

Optional

31mW

(0dBm)N/A Optional

Power 1mW (class 3)•3% power of cellular phone•10meters of transmission distance or 100m by PA

Power 100mW(class 1)•100 meters of transmission distance


Frequency Hopping

Time

Frequency

0

78


FHSS

DataSource

HoppingCode

Generator

+d(t)

DigitalModulator

Frequencysynthesizer

Front-endFilter

+

Frequencysynthesizer

DataDetector

d(t)^

Local hoppingcode generator

Receiver

Transmitter


Modulation and Symbol Rate

• Symbol Rate : 1M symbols/sec (1MHz)• GFSK (Gaussian Frequency Shift Keying) (Gaussian Frequency Shift Keying)

– Binary One (1) : Positive frequency deviation

– Binary Zero (0) : Negative frequency deviation

• Maximum frequency deviation– Between 140kHz and 175kHz

fo fo+ffo-ffrequency

Magnitude


Adaptive Frequency Hopping

• When no interference is detected, hop over the entire frequency band

• If interference is detected at a level which cause packet error

– Actively avoid these frequency hop locations.

– This technique is currently legal for Class 3 Bluetooth units.

– Hop locations must be maintained


Interference Simulations

– 1 Bluetooth piconet + 1 WLAN unit

– PER (Packet Error Rate) without adaptation =11%

– PER with adaptation = 0%

– 5 Bluetooth piconets separated by 5 meters + 1 WLAN unit

– PER without adaptation =15%

– PER with adaptation = 8.4%


Radio 2 WG

• Radio 2 WG mandated to be backward compatible and interoperable with Radio 1– 5.8G ISM band

– is optional extensions for providing additional capabilities for applications

– Higher data rates:• Multimedia (streaming audio/video)• High speed image transfer• High speed transfer of large files to (e.g.) printers• Data rate alignment with 2.5/3G cellar networks

– 10M-12Mbps goal


MM

S

S S

S

P

sb

sb

P

P

Network Topology

• Radio Designation– Connected radios can be mastermaster

or slaveslave

– Radios are symmetric (same radio can be master or slave)

• PiconetPiconet– Master can connect to 7 simultan

eous or 200+ active slaves per piconet

– Each piconet has maximum capacity (1 Msps and 1 Mbps)

» Unique hopping pattern/ID

• ScatternetScatternet– High capacity system

» Minimal impact with up to 10 piconets within range

– Radios can share piconets!


Piconet vs. Scatternet• A scatternet contains two piconets

ScatternetPiconet

PiconetMaster

Slave

Slave

Slave

Slave

Slave

Master


Piconet and Scatternet

point-to-point(piconet)

multi-point(piconet)

scatternet

Master host Slave host


Device Addressing (1/2)• Every Bluetooth device has unique 48-bit Bluetooth Device

Address (BD_ADDR(BD_ADDR) which is assigned by SIG

• The BD_ADDR is used to control the system functions : – Hopping sequence

– Channel access code

– Encryption key

• The BD_ADDR contains 3 parts:– 24-bit Lower Address Part (LAP)

» Used to identify unique BT device (reduce overhead)

– 8-bit Upper Address Part (UAP)» Used to determine the hopping sequence

– 16-bit Non-significant Address Part (NAP)

NAP UAP LAP

16 8 24 bits

BD_ADDR


Device Addressing (2/2)

• AM_ADDRAM_ADDR (Active Member Address)– Each slave is assigned a 3-bit address

– 77 slaves in a piconet is available

– 000000 : for broadcasting packets (I.e. master address)» An exception is FHS (FFrequency HHopping SSynchronization) packet

which may use “000” address but is not a broadcast message

– Slaves that are disconnected or parked give up their AM_ADDRs

• PM_ADDRPM_ADDR (Parked Member Address)– Slaves that enter the park mode will obtain a 8-bit PM_ADDR

– At most 256 slaves are in park mode in a piconet


Clock Synchronization

• CLKNCLKN (Native Clock)(Native Clock)– Exist in each bluetooth device

– The counter can not be frozen and adjusted

– Clock resolution : 312.5us (half slot time : used for paging/inquiry procedures)

– slave follows its master CLKN to hop in a piconet» Master need inform the slave its CLKN and BD_ADDR

» Slave adds offset into its CLKN to synchronize with master

same hopping sequence3, 56, 7, 23, 44, …

MasterBD_ADDR

Slave Native CLK

+

offset

Master clock

BD_ADDR


Clock Synchronization

• CLKECLKE (Estimated Clock)(Estimated Clock)– Is used when master pages a known slave device (has

been inquired)

– Master uses the slave’s BD_ADDR to estimate the slave’s CLKN

estimated slave’s hopping sequence3, 56, 7, 23, 44, …

SlaveBD_ADDR

Slave CLKE

+ Slave clock

BD_ADDR

paging


A

D

C

B

E

ID b

ID a

ID c

ID d

ID e

The Piconet

• All devices in a piconet hop together– In forming a piconet, master gives slaves its clock and device ID (B

D_ADDR) via FHS packet» Hopping pattern determined by device ID (48-bit)

» Phase in hopping pattern determined by Clock

• Non-piconet devices are in standbystandby

• Piconet Addressing– Active Member Address (AMA, 3-bits)

– Parked Member Address (PMA, 8-bits)

M

P

S

S

sb

ID a

ID c

ID d

ID a

IDa

IDa

ID e

ID a

P

M Sor

sb

ID b


Basic Baseband Protocol

• Spread spectrum frequency hopping radio– Hops every packet

» Packets are 1, 3 or 51, 3 or 5 slots long– Frame consists of two packets

» Transmit followed by receive– Nominally hops at 1600 times a second (1 slot

packets)

O neSlot

Packet

Three S lot Packet

Fram e

M aster

S lave

625 usO ne S lo t

fk fk+1

O neSlot

Packet

Fram e

M aster

S lave

625 usO ne S lo t

fk fk+1

O neSlot

Packet

(1.25 ms)


Time Division Duplex (TDD)

• Master : even numbered slots• Slave : odd numbered slots• The Slot Number ranges from 0- 227-1.

Access code/Header Payload guard time for hopping

Master

Slave

f(2k) f(2k+1) f(2k+2)

Packet

odd (625s)even (625s) eventimeslot

guardtime

220 s+/-10 s


Multi-slot Packets• Different packet overhead will result in different throughput

– DH1 : 172.8Kbps in Sym. and Asyn. modes– DH3 : 390.4Kbps in Sym. mode; 387.2 and 54.4Kbps in Asyn. Mode– DH5 : 433.9Kbps in Sym. mode; 721 and 57.6Kbps in Aysn.

» DH : without FEC

f(2k+2)f(2k) f(2k+1) f(2k+3) f(2k+4)

f(2k+2)f(2k) f(2k+1) f(2k+3) f(2k+4)

f(2k+2)f(2k) f(2k+1) f(2k+3) f(2k+4)

3-slotPacket(DH3)

5-slotPacket(DH5)

1-slotPacket(DH1)

odd (625s)even (625s) odd (625s)even (625s)


Connection Procedure (1/3)

• StandbyStandby– Waiting to join a piconet

• InquireInquire– Ask about radios to connect

to

• PagePage– Connect to a specific radio

• ConnectedConnected– Actively on a piconet (mast

er or slave)

• Park/Sniff/HoldPark/Sniff/Hold– Low Power connected state

s



ID packet

FHS packet

FHS packet

ID packet

ID packet

Data packet

ID : GIAC/DIAC

FHS : slave’s BD_ADDR, CLKN, Class of Devise(CoD), Page Scan Interval

ID : DIAC

FHS : master’s BD_ADDR, CLKN, CoD, BCH parity, AMA


ID Packet

• Access Code

• During a connection– identifies the packet as being from or to a specific Master

• Other modes– in inquiry to produce the Inquiry Access Code (IAC)

LAP

24 bits

Barker

Sequence

BCH Parity

Word

34bits 24bits 6bits


FHS Packet Format

• Used when

1. Master inquiries device during inquiry procedure, return from Slave

2. Master pages a Slave during page procedure, sent from Master

3. A device switches as Master



Inquiry Page

C onnectedAM A

Transm itdataAM A

T typ ica l=0.6s

T typ ica l=2s

H O LDAM A

PAR KPM A

T typ ica l=2 m s T typ ica l=2 m s

R e leasesA M A

A ddress

Low Pow erStates

ActiveStates

Standby

ConnectingStates

UnconnectedStandby


Page and Inquire Scans

• A radio must be enabled to accept pages or inquires

– Consumes 18 slots every 1.25 s (or so) for each scan slot is 0.625 ms

InquireScan

Page Scan

T typ ica l=1.25Sleep

T typ ica l=11 m s18 s lo ts


Standby

InquireScan

Page Scan

T typ ica l=1.25C onnected



Connected


Page and Inquire Scans

• Inquiry scan:– 32 channels (of 79 channels) are assigned for inquiry

procedure

– 32 channels are divided as 2 trains (Trains A and B), each one contains 16 channels.

• Page scan:– 32 channels (of 79 channels) are assigned for page procedure

– 32 channels are divided as 2 trains (Trains A and B), each one contains 16 adjacent channels.

– Train A : f(k-8), f(k-7), … f(k), f(k+1), … , f(k+7)

– Train B : f(k-16), f(k-15), … f(k-9), f(k+8), … , f(k+15)

• 3200 hop/sec

• Broadcast ID packet (with specified GIAC or DIAC)


Inquiring for Radios

• Radio wants to find other radios in the area

A

D

C

BID b

ID a

ID c

ID d



• Radio Wants to find other radios in the area– Radio A issues an Inquire (pages with the Inquire ID)

» Radios B, C and D are doing an Inquire Scan

A

D

C

BID b

ID a

ID c

ID d

InquireIN Q

IN Q IN Q




» Radios B, C and D are doing a Inquire Scan– Radio B recognizes Inquire and responds with an FHS

packet» Has slave’s Device ID and Clock

A

D

C

BID b

ID a

ID c

ID d

ID b




» Radios B, C and D are doing a Inquire Scan

– Radio B recognizes Inquire and responds with an FHS packet

» Has slave’s Device ID and Clock

A

D

C

BID b

ID a

ID c

ID d

Inquire

ID b

IN Q

IN Q IN Q



• Radio Wants to find other radios in the area– Radio A Issues an Inquire (again) – Radios C and D respond with FHS packets

» As radios C & D respond simultaneously packets are corrupted and Radio A won’t respond

» Each radio waits a random number of slots and listens

ID b

ID a

ID c

ID dID b

ID c

ID d

A

D

C

B



• Radio Wants to find other radios in the area– Radio A Issues an Inquire (again)

A

D

C

BID b

ID a

ID c

ID d

Inquire

ID b

IN Q

IN Q IN Q




– Radios C respond with FHS packets

ID b

ID a

ID c

ID dID b

ID c

A

D

C

B




A

D

C

BID b

ID a

ID c

ID d

IN Q

ID b

ID c

IN Q IN QInquire




– Radios D respond with FHS packets

ID b

ID a

ID c

ID d

ID d

A

D

C

B

ID b

ID c




– Radios D respond with FHS packets

– Radio A now has information of all radios within range

ID b

ID a

ID c

ID d

A

D

C

B

ID b

ID c

ID d


Inquiry Procedure

• Inquiry has unique device address (all BT radio use)– ID packet with dedicated or general access code– Unique set of “Inquiry” hop frequencies

• Any device can inquire by paging the Inquiry address• Correlater hit causes slave to respond with FHS packet

– Device ID– Clock– Etc.

ID a

ID b

625 s

IN Q IN Q

fk+1fk

fk+1

ID b

FHS

fk+1fk

IN Q

fk+4

INQUIRER

STANDBY


Inquiry Procedure

• 3232 channels are allocated as inquiry procedure– They are divided as two trains : A Train and B Train (16 channels for each)

• Multiple slaves are expected to respond– Correlater hit causes slave to

» respond with FHS packet» Wait a random number of slots» Wait for another Inquiry page and repeat

• Master should end up with a list of slave FHS packets in area

train A A A A B

10 ms

INQUIRER

STANDBY

Listen 11.25 ms (18 slots)

AFHS

scan fksleep RAND2

fk+1

1.25ms

fk

A

fk+1

FHS

fk+2sleep RAND1

A A A

A A A A

2 slots

1 2 3 15 16

Fully scan Train A:16*0.625ms=10ms (1) Train A will be scanned 256 times: 2.56s (2) Train B will be scanned 256 times: 2.56sRepeat scan Trains A and B two complete cycles:2*(2.56+2.56)=10.24s

16 slots = 10ms

repeat 256 times


Inquire Summary

• Inquiring radio Issues inquiry packet with Inquire ID (GIAC or DIAC access code)

• Any radio doing an Inquire scan will respond with an FHS packet– FHS packet gives Inquiring radio information to page

» Device ID

» Clock

– If there is a collision then radios wait a random number of slots before responding to the page inquire

• After process is done, Inquiring radio has Device IDs and Clocks of all radios in range

• Slave listens one of 16 channels for sufficient time (e.g., 18 slots=11.25ms)

ID a


Master Paging a Slave

• Paging assumes master has slaves Device ID and an idea of its Clock

A

C

ID a

ID c

ID c



• Paging assumes master has slaves Device ID and an idea of its Clock

– A pages C with C’s Device ID and CLKE

A

C

ID a

ID c

ID c

ID c

Page



• Paging assumes master has slaves Device ID and an idea of its Clock– A pages C with C’s Device ID (DAC)

– C Replies to A with C’s Device ID

A

C

ID a

ID c

ID c

ID c



• Paging assumes master has slaves Device ID and an idea of its Clock– A pages C with C’s Device ID


– A sends C its Device ID and Clock (FHS packet)

A

C

ID a

ID c

ID c

ID a



• Paging assumes master has slaves Device ID and an idea of its Clock– A pages C with C’s Device ID


– A sends C its Device ID and Clock (FHS packet)

– A connects as a master to C

A

C

ID a

ID c

ID c

IDa


Master Paging a slave

• Master pages slave (packet has slave ID) at slave page frequency (1 of 32)– Master sends page train of 16 most likely frequencies in slave hop set

» Slave ID sent twice a transmit slot on slave page frequencySlave ID sent twice a transmit slot on slave page frequency

» Master listens twice at receive slot for a responseMaster listens twice at receive slot for a response

– If misses, master sends second train on remaining 16 frequencies

• Slave listens for 11.25 ms (page scan)– If correlater triggers, slave wakes-up and relays packet at response frequency

– Master responds with FHS packet (provides master’s Device ID and Clock)

– Slave joins piconet

625 s

fmfk+2

Master

Slave

fk+1fk

fk+1

ID c ID c

fk+1fk

ID c ID c

FHS

fk+2

ID a

ID a

ID c


Paging Procedure

• Each slave page scans on unique sequence of 32 channels fk

– Master pages 16 most likely channels for entire sleep period (nominally 1.251.25 seconds)

• If clocks are off, then second train sent on last 16 frequencies for entire sleep period

train A A A A B B

10 ms

Pager

Paged

11.25 ms

B B

FHS

scan fkSleep (1.25 s)

CONNECTION

fk+1

1.25ms


Physical Link Definition

• circuit switching• symmetric, synchronous services• slot reservation at fixed intervals• For voice transmission• Point-to-point connection• No packet retransmission

• packet switching• (a)symmetric, asynchronous services• polling access scheme• For data transmission (ex:program)• Point-to-multipoint connection• Packet retransmission

• SYNCHRONOUS CONNECTION-SYNCHRONOUS CONNECTION- ORIENTED (SCO) LINKORIENTED (SCO) LINK

• ASYNCHRONOUS CONNECTION-ASYNCHRONOUS CONNECTION- LESS (ACL) LINKLESS (ACL) LINK


Physical Link

HV3 : 6 slots gap


Packet Types/Data Rates

0000000100100011

NULLPOLLFHSDM1

NULLPOLLFHSDM1

1

0100010101100111

HV1HV2HV3

DH1

2

DV10001001

101010111100

DM3DH3

3

1101

11101111

DM5DH5

4

TYPESEGMENT ACL link

SCO link

AUX1

DM1

DH1

DM3

DH3

DM5

DH5

108.8

172.8

258.1

390.4

286.7

432.6

108.8

172.8

387.2

585.6

477.8

721.0

108.8

172.8

54.4

86.4

36.3

57.6

TYPE symmetric asymmetricData Rates (Kbps)

Packet Types


Bluetooth Protocols

Still Image

WAE

WAP

vCard/vCal

OBEXPrinting

Audio

HID TCP/UDP RFCOMM

Service Discovery IP TCS

L2CAP

Host Controller Interface


THANK YOU

Q&A

NDSL Lab. CSIE, CGU - 1 6-1. Bluetooth Architecture Overview.

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Transcript of NDSL Lab. CSIE, CGU - 1 6-1. Bluetooth Architecture Overview.