presentation on edge

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PRESENTATION ON EDGE BY- MAYANK SINGH POOJA YADAV TULIKA SAHU RAKESHWARI LAHRE AAKANKSHA SONI

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PRESENTATION ON EDGE. BY- MAYANK SINGH POOJA YADAV TULIKA SAHU RAKESHWARI LAHRE AAKANKSHA SONI. EDGE. What is EDGE EDGE Modulation and coding schemes Link Adaptation EDGE Management ARQ Window sizing. What is EDGE. E nhanced D ata Rate for G PRS E volution - PowerPoint PPT Presentation

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Page 1: PRESENTATION  ON  EDGE

PRESENTATION ON

EDGE

BY- MAYANK SINGH POOJA YADAV TULIKA SAHU RAKESHWARI LAHRE AAKANKSHA SONI

Page 2: PRESENTATION  ON  EDGE

EDGE What is EDGE EDGE

Modulation and coding schemes Link Adaptation

EDGE Management ARQ Window sizing

Page 3: PRESENTATION  ON  EDGE

What is EDGE Enhanced Data Rate for GPRS Evolution

In GSM standards also known as EGPRS (Enhanced GPRS)

Wireless packet data access to Internet Same as GPRS only faster and more robust

Supports asymmetric traffic on the radio link

Difference between EDGE and GPRS is only on air interface

Page 4: PRESENTATION  ON  EDGE

EDGE Bandwidth Requirements EDGE introduces:

8PSK modulation. Increases raw throughput by a factor of

three (over GMSK) More efficient use of Spectrum Increases the

New coding schemes MCS1 to MCS9

EDGE impacts: Air interface Backhaul requirements

Page 5: PRESENTATION  ON  EDGE

GPRS Vs. EDGE

Page 6: PRESENTATION  ON  EDGE

New EDGE Modulation & Coding Schemes

GSM/GPRS uses GMSK modulation (Gaussian Modulated Shift Keying) and 4 Coding Schemes are defined in GPRS : CS1 to CS4.

EDGE introduces a new modulation : 8PSK (8 Phase Shift Keying).

8PSK defines 8 states of the radio signal instead of 2 for GMSK.

3 bits can be coded with 8PSK instead of 1 for GMSK.

Page 7: PRESENTATION  ON  EDGE

GMSK vs 8PSK Modulation

Page 8: PRESENTATION  ON  EDGE

Link Adaptation

• The modulation and coding scheme is selected based on the radio channel condition— For high interference conditions, coding with lower data rates and

better error correcting capability is used— For low interference conditions, coding with higher data rates and

less error correcting capability is used

• Link adaptation improves the through put for the network

• Base station determines coding and modulation schemes to be used for the uplink and the downlink

Page 9: PRESENTATION  ON  EDGE

Link Adaptation mechanism

• Measurement• MS measures the signal quality of

each received block.

• Report• MS reports the signal

measurement to PCU.

• Adaptation• PCU selects the accurate MCS

based on MS measurements.

Page 10: PRESENTATION  ON  EDGE

EDGE Performance More users with more throughput.

Peak Throughput of 473kbps - Average Throughput 120 kbps

2.5 x GPRS Throughput, or 6.5 x GPRS traffic

Up to 2.5x data throughput for equal trafficGPRS

EDGE

GPRSEDGE

Up to 6.5x traffic for same bandwidth (15 kbps/slot)

DataThroughput

Users

Equal Traffic Model

Equal QoS Model(Data Equivalent to Erlang’s Law)

Or

EDGE Significantly improves GPRS Performance

Page 11: PRESENTATION  ON  EDGE

EDGE Management ~ARQ Windows

ARQ Window determines how many MAC blocks can be transmitted before the first block in the window gets acknowledged

If the ARQ window limit is reached before the first block in the windows gets acknowledged, a stalling condition is reached

No new blocks are transmitted Only retransmission of the first unacknowledged block Result in loss of throughputs

Page 12: PRESENTATION  ON  EDGE

Summary EDGE is EGPRS or Enhanced GPRS

Brings speed and robustness New modulation and coding schemes Link adaptation Incremental redundancy

Uses the GSM/GPRS Radio Access equipment

Page 13: PRESENTATION  ON  EDGE

THANK YOU