Enhanced Data Rates For GSM Evolution(EDGE)

Presented By : Sidharth Mahapatra

Guided By : Prof. Smita Mohanty

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About EDGE

Enhanced data rates for GSM Evolution (EDGE) or Enhanced GPRS (EGPRS).

It is a digital mobile phone technology that allows improved data transmission rates and reliability.

EDGE is considered as pre-3G radio technology and was deployed on GSM networks beginning in 2003 – initially by Cingular (now AT&T) in the United States.

EDGE can function on any network with GPRS deployed on it, provided the carrier implements the necessary upgrades.

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About EDGE

It is a technology that gives GSM the capacity to handle services for the third generation of mobile network.

It enables services like multimedia file transfer, web browsing and video conferencing to be easily accessible from wireless terminals.

Using EDGE, operators can handle triple subscribers than GPRS, triple their data rate and add extra capacity to their voice communications.

EDGE is capable of offering data rates of 384 kbps and theoretically, up to 473.6 kbps.

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Why Evolve EDGE ?

EDGE provides an evolutionary migration path from GPRS to UMTS.

Broadband-like speed is achievable on the current 200 kHz GSM radio carrier.

Easy to offer global service to subscribers – 82% of global market is GSM. Hence easy roaming and billing.

Economic forces - less costly than upgrading to third generation technology.

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ServicesservicesServices

Voice

SMS

Internet Access

MMS

Streaming

Bandwidth

Services

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PC or LAPTO

P

MOBILE MS

CBSC

GGSN

SGSNBT

S

BTS

EDGE in GSM Network

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Implementation of EDGE

No hardware or software changes to be made in GSM core networks, only base stations must be modified.

EDGE compatible transceiver units must be installed in Base Station Subsystem hardware.

Software upgrades to the Base Station Controller (BSCs) and Base Stations (BS). EDGE is just an “add-on” to the BSS.

A new modulation scheme “8-PSK” is introduced to provide high data rate and high spectral efficiency.

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Reasons for using 8-PSK

To achieve higher bit rates than that of GPRS, the existing GMSK modulation technique must be modified.

EDGE is specified to reuse the channel structure, width, coding and existing mechanism of GPRS.

The modulation technique used for EDGE i.e. “8-PSK” fulfills all those requirements.

This makes it possible to integrate new EDGE channels into an existing frequency plan of GSM network.

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GMSK vs. 8-PSK

I/Q Diagram showing EDGE Modulation Benefits

Q

P

Q

P

GMSK Modulation 8-PSK Modulation

(000)

(001)

(010)

(011)

(111)

(110)

(101)

(100)

1

0

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8-PSK Modulation

The 8-PSK modulation is a method in which 1 symbol carries 3 bits of information.

The total data rate is therefore increased by a factor of three.

The distance between the symbols are shorter than that of GMSK. Hence increase the risk of misinterpretation of symbols.

Each set of bits is just one bit different from its neighbor. So if the radio receiver makes an error in reading the symbol, most likely this will result in only one bit being misinterpreted.

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Series1 MIA HSCSD GPRS EDGE UMTSD. C.FAX / DATA /SMS

9.6 Kbps

19 Kbps

22.8 Kbps

57.6 Kbps

170 Kbps

473.6 Kbps

2000 Kbps

Evolution of Mobile Data Services

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Technical Difference Between GPRS and EDGE

EDGE is a subsystem within the GSM standard. But GPRS has introduced Packet-Switched Data into GSM networks.

EDGE is an “add-on” to GPRS and can not work alone.

EDGE can transmit three times as many bits as GPRS during the same period of time.

EDGE requires less number of radio resources to support the same traffic, thus freeing up capacity for more data and voice services.

Technical Difference Between GPRS and EDGE

GPRS uses 4 coding schemes whereas EDGE uses 9 coding schemes.

GPRS and EDGE have different protocols and behavior on the base station system side.

GPRS allows average data rates of 115 Kbps and theoretically up to 160 Kbps whereas EDGE offers average data rate of 384 Kbps and theoretically up to 473.6 Kbps.

GPRS and EDGE share the same symbol rate but the modulation bit rate differs.

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0

10

20

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60

70

CS

1 CS

2 CS

3

CS

4

MC

S1

MC

S2

MC

S3 M

CS

4

MC

S5

MC

S6

MC

S7 M

CS

8

MC

S9

GPRS EDGE

Coding Schemes for GPRS and EDGE

Kbps

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Advantages of EDGE

User Benefits

1. Speed

2. An “always-on” connection

3. Value

4. Coverage

5. Phone selection

Advantages of EDGE

Operator Benefits

1. Spectrally efficient and flexible

2. Ease of upgrade

3. Compatibility

4. Cost-efficiency

5. Volumes

Conclusion

EDGE filling the gap between GPRS and 3G.

EDGE evolution can satisfy increased data demand and produce increased revenue.

EDGE Evolution will improve performance and coverage even further, with bit-rates of up to 1 Mbit/s.

EDGE will provide the solution for operators wanting to increase the data capacity in their GSM network prior to UMTS deployment.

Advantages of EDGE

Operator Benefits

1. Spectrally efficient and flexible

2. Ease of upgrade

3. Compatibility

4. Cost-efficiency

5. Volumes

Any Questions ?

Thanking you all…...