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Welcome

By

Karthik

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EDGE TECHNOLOGY

AN EVOLUTION IN

MOBILE

TECHNOLOGY

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History

• In 1st G AMPS(Advanced Mobile system) developed in U.S in 1983

• In 2nd G there was introduction of CDMA,TDMA and GSM

• Between 2nd and 2.5th G of GPRS

• Between 2.5th and 3rd G there was an introduction EDGE TECHNOLOGY

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Then Came Digital………..Then Came Digital……….. Then Came Digital………..Then Came Digital………..

AMPS

CDPD

1G 2G

CDMA

TDMA

GSM

IDEN

2.5G

GPRS

1XRTT

3G

1X-EVDO

EDGE

WAN LAN

80

2.1

1

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Introduction

• Enhanced data for global evolution(EDGE) is a high speed mobile data standard,intended to enable second generation global system for mobile communication (GSM) and time division multiple access(TDMA).

• Transmits data at up to 384 kilobits per second(Kbps)

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Topics of Discussion

• Mobile evolution

• Edge technology

• GPRS

• EDGE system performance

• Channel coding and frame structure

• Applications

• Conclusion

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Mobile evolution

• 1st generation mobile communication

• 2nd generation mobile communication

• 2.5th generation mobile communication

• 3rd generation mobile communication

• 3G and above

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EDGE Technology

• Evolutionary path to 3G services for GSM and TDMA operators

• Builds on General Packet Radio Service (GPRS) air interface and networks

• Phase 1 (Release’99 & 2002 deployment) supports best effort packet data at speeds up to about 384 kbps

• Phase 2 (Release’2000 & 2003 deployment) will add Voice over IP capability

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Enhanced Data rates for GSM Evolution

• Can increase the capacity and data throughput typically to 3-4-fold over GPRS

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

• Average recognizable data rates between 80 and 130 kbps

• TDMA carriers must still convert to GSM, then add GPRS before deploying EDGE technology

EDGEEDGE EDGEEDGE

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2.5G (Between 2G and 3G)

• Uses General Packet Radio Services (GPRS) technology.

• GSM and TDMA were enhanced to packet based networks

• GPRS is primarily a simple software upgrade on GSM and TDMA

• Easy for the service providers to update their networks

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GPRS• Packet based networked over existing

circuit switched GSM network.• GPRS radio resources are used only when

users are actually sending or receiving data. • Rather than dedicating a radio channel to a

mobile data user for a fixed period of time, the available radio resource can be concurrently shared between several users.

• Brings desktop experience to wireless such as web browsing and chat.

• Enables file transfer and home automation.

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2.5G characteristics

• Data rates 64 – 144 Kbps.

• A leap from 9.6kbps of 2G to 64Kbps

• Packet based networks.

• Always-on connectivity.

• Instant messaging + small attachments.

• New wireless standards started emerging.

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GPRS shortcomings

• GPRS packets are sent in all different directions to reach the same destination

• Potential for packet getting lost or corrupted during the data transmission over the radio link.

• Though it incorporates data integrity and retransmission strategies, potential transit delays can occur.

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EDGE Technology

• EDGE – Enhanced Data GSM Environment.

• Developed to increase the bandwidth of GPRS technology.

• EDGE increased the bandwidth of GSM from 144 Kbps to 384 Kbps.

• Migration towards 3G technology started.

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Courtesy: http://www.gsmworld.com/technology/index.shtml

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EDGE System Performance

0102030405060708090100

0 10 20 30 40 50 60 70

Probability throughput < = X per timeslot

X (kb/s)

26 users/sector at 3.84 kbps average load per user

0102030405060708090100

0 1000 2000 3000 4000 5000

Probability packet delay < = X

X (msec)

%%

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EDGE modulations

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EDGE Channel Coding and Frame Structure

464 bits1 data block

Convolution CodingRate = 1/3Length = 7

Puncture Interleave

Burst N

Burst N+1

Burst N+2

Burst N+3 Burst Format

8PSK Modulate

1392 bits 1392 bits

348 bits/burst

348 bits468.75 bits

156.25 symbols/slot

0 1 2 3 4 5 6 7

8 Time Slots

1 Time Slot = 576.92 µs

Tail symbols

3

Data symbols

58

Tail symbols

3

Data symbols

58

Training symbols

26

Guard symbols

8.25

Modulation: 8PSK, 3 bits/symbolSymbol rate: 270.833 kspsPayload/burst: 348 bitsGross bit rate/time slot: 69.6 kbps - overhead = 59.2 kbps user data

20 msec frame with 4 time-slots for each of 8 bearers

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Some of the generation mobile phones

• 2nd generation phones

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Personal Digital Assistants & 2.5 G phones

Wireless via Bluetooth

Internet

Wireless via GPRS

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Combined PDAs and 2.5 G phones

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3G phones

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Applications

 • EDGE enables operators to introduce 3G data

applications into existing GSM existing GSM networks and thereby increase the speed of packet oriented transmission three-fold.

        Mobile Internet access        Mobile Office        Field sales/service        Wireless access to databases

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Application cont

        Electronic commerce: Point of sale Electronic banking  Electronic cash Electronic payment        Messaging        Fleet management        Road guide systems        Security/supervisory systems•

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Application cont

• Reservation system (e.g. hotel, theater, flights)

• Highway charging systems

• Location based info service

• Video telephony

• Telescoping

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Conclusion

• EDGE paves the way into mobile multimedia applications whilst offering the maximum of investment protection:

  No need for new network elements

• Low risk of investment thanks to the dual mode of GSM/EDGE (Slot by slot)

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Conclusion cont

• 1.     Smooth evolution path• 2.     Supporting same type of services as GPRS but

with higher data rates of more than 400 kbit/s• 3.     Use of GSM spectrum, bandwidth, protocol,

carrier structure and cell planning process•      i.      Additional step towards UMTS –enables

smooth network evolution•      ii.     New business opportunities in a market

with tremendous growth potential•      iii.      Better ratio of cost to bandwidth

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THANK YOU

THANK YOU FOR YOUR PRECIOUS TIME