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PRESENTATION ON EDGE

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

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PRESENTATION ON EDGE

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

  2. EDGE • What is EDGE • EDGE • Modulation and coding schemes • Link Adaptation • EDGE Management • ARQ Window sizing

  3. 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

  4. 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

  5. GPRS Vs. EDGE

  6. 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.

  7. GMSK vs 8PSK Modulation

  8. LinkAdaptation • 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

  9. LinkAdaptationmechanism • 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.

  10. Up to2.5x data throughput for equal traffic GPRS Equal Traffic Model DataThroughput EDGE Or • Up to6.5x traffic for same bandwidth (15 kbps/slot) Equal QoS Model (Data Equivalent to Erlang’s Law) GPRS Users 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 EDGE Significantly improves GPRS Performance

  11. 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

  12. 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

  13. THANKYOU

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