3G Wireless Data Connectivity

7/30/2019 3G Wireless Data Connectivity

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There was Analog, and it was easy

AMPS (Advanced Mobile Phone System)

FCC designated industry standard

2 licensed carriers in each market (A and B side) All carriers operate in the 800 Mhz band

Consistent technology

Seamless roaming (although costly)

Limited data applications (slow and unreliable)

First Commercially deployed in The U.S. in 1983

In The Beginning..
http://www.verizonwireless.com/index.html


2/21

Then Came Digital..

AMPS

CDPD

1G


3/21

Cellular Digit Packet Data

Digital overlay to the analog cellular network

Designed specifically for data transmission

Dedicated channel capacity Industry standard, TCP/IP based technology

Reliable and connectionless

Cost effective-billed only for data passed, not

length of connection Secure-private connection solutions available

Most commonly used in public safety

CDPD


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Then Came Digital..

AMPS

CDPD

1G 2G

CDMA


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CDMA Qualcomm based spread spectrum technology A digital Cellular technology that uses spread-

spectrum techniques. Unlike competing systems,

such as GSM, that use a form of TDMA, CDMA doesnot assign a specific frequency to each user.Instead, every channel uses the full availablespectrum. Individual conversations are encoded witha pseudo-random digital sequence.

Most common digital technology in the U.S. Capacity increases of 8 - 10 times that of an AMPS

analog system Enhancedprivacy Clear path to next generation technology(3G)

CDMA (IS-95A)

Optional information for those that need to know


6/21

Then Came Digital..

AMPS

CDPD

1G 2G

CDMA

TDMA


7/21


TDMA First digital technology deployed in the U.S. Operates in the 800 Mhz and 1900 Mhz bands digital systems get their name, Time Division Multiple Access,

by dividing a single channel into a number of timeslots. Each

user gets to use only one out of every few slots. First, a smallamount of the voice conversation of one user is transmitted,and then the second, and so on until all users on one channelhave transmitted when the cycle repeats. Obviously, it isnecessary to compress voice conversations with TDMAsystems. Consider a TDMA system with 5 users in eachfrequency band, alternating every 10 milliseconds. Each user

only gets 2 milliseconds (less, considering overhead) for each10 milliseconds of conversation.

No wireless data capabilities (except analog) No path to next generation technology(3G) Technology will be phased out in the U.S

TDMA (IS-54)


8/21

Then Came Digital..

AMPS

CDPD

1G 2G

CDMA

TDMA

GSM


9/21

Global System for MobileCommunications

Although a form of TDMA, incompatible with

IS-54 used in the U.S. Operates at 1900Mhz in the U.S. (T-Mobile)

Uses smart card technology

The only all GSM carrier in the U.S. is T-Mobile (Voice Stream)

Wireless data rate is only 9.6 kbps

GSM


10/21

Then Came Digital..

AMPS

CDPD

1G 2G

CDMA

TDMA

GSM

IDEN


11/21

Integrated Digital Enhanced

Network

Technology designed by Motorola

Nextel and Southern LINC use thistechnology in the U.S.

Limited to Motorola hardware only

Also a TDMA technology derivative Commonly known for push to talk feature

Coverage often a limitation

IDEN


12/21

Then Came Digital..

AMPS

CDPD

1G 2G

CDMA

TDMA

GSM

IDEN

2.5G

GPRS


13/21

General Packet Radio Service

Theoretical maximum speeds of up to 171.2kilobits per second (kbps)

Download speeds of approximately 40 kbps Upload speeds of approximately 9.6 kbps

Average recognized speed 20-30 kbps

Availability limited due to carrier technologychanges

T-Mobile offers this service in the localmarket-limited coverage

GPRS
http://www.verizonwireless.com/index.htmlhttp://www.verizonwireless.com/index.html


14/21

Then Came Digital..

AMPS

CDPD

1G 2G

CDMA

TDMA

GSM

IDEN

2.5G

GPRS

1XRTT


15/21

Single Carrier Radio Transmission

Technology

Technology currently available from VerizonWireless (Express Network) and Sprint PCS

(Vision) Theoretical maximum speeds of up to 153

kilobits per second (kbps)

Average recognizable data rates between 40

and 70 kbps Strong and growing coverage-easy overlay

to existing technology

1XRTT


16/21

Then Came Digital..

AMPS

CDPD

1G 2G

CDMA

TDMA

GSM

IDEN

2.5G

GPRS

1XRTT

3G

1X-EVDO

EDGE


17/21

1X Evolution, Data Optimized

Also referred to as HDR, High Data Rate Peak data rates of up to 2.4 Mbps Recognizable throughput between 300-600

Kbps Currently being tested by Verizon Wireless in

the Washington/Baltimore, San Diegomarkets

National Deployment just announced!

Already commercially available in Korea

1XEV-DO


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Enhanced Data rates for GSM Evolution

Can increase the capacity and datathroughput typically to 3-4-fold over GPRS

Theoretical maximum speeds of up to 473kilobits per second (kbps)

Average recognizable data rates between 80and 130 kbps

TDMA carriers must still convert to GSM,then add GPRS before deploying EDGEtechnology

EDGE


19/21

Then Came Digital..

AMPS

CDPD

1G 2G

CDMA

TDMA

GSM

IDEN

2.5G

GPRS

1XRTT

3G

1X-EVDO

EDGE

WAN LAN

80

2.11


20/21

802.11 specifies an over-the-air

interface between a wireless client anda base station or between two wirelessclients.

802.11


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802.11 -- applies to wireless LANs and provides 1 or 2 Mbps

transmission in the 2.4 GHz band using either frequencyhopping spread spectrum (FHSS) or direct sequence spreadspectrum (DSSS).

802.11a -- an extension to 802.11 that applies to wirelessLANs and provides up to 54 Mbps in the 5GHz band. 802.11auses an orthogonal frequency division multiplexing encodingscheme rather than FHSS or DSSS.

802.11b (also referred to as 802.11 High Rate or Wi-Fi) --anextension to 802.11 that applies to wireless LANS and provides11 Mbps transmission (with a fallback to 5.5, 2 and 1 Mbps) in

the 2.4 GHz band. 802.11b uses only DSSS. 802.11b was a1999 ratification to the original 802.11 standard, allowingwireless functionality comparable toEthernet.

802.11g -- applies to wireless LANs and provides 20+ Mbps inthe 2.4 GHz band

802.11


3G Wireless Data Connectivity

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