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Enhanced Data rates for GSM Evolution (EDGE)

Overview  |  Reverse/Forward Process  |  Library Components

 

    EDGE - Overview

Beyond GPRS, EDGE takes the cellular community one step closer to UMTS. It provides higher data rates than GPRS and introduces a new modulation scheme called 8-PSK. EDGE is also being adopted by the TDMA community for their migration to UMTS. Nuntius has solutions for the EDGE handset functions to help reach handset deployment quicker. For more information, contact Nuntius Systems, Inc.

 
Data rates:
384 kbps and above
 
Channel coding
Outer block coding
Inner Convolutional coding
Interleaving scheme for error bursts
Modulation
GMSK (Gaussian Minimum Shift Keying)
8-PSK (Phase Shift Keying)

 
Multiple Access
Combination of TDMA & FDMA
       
 
Transmit Frequency bands

Mobile station    
Base station
Uplink
Downlink    
Reverse ch. 890 - 915 MHz
Forward ch. 935 - 960 MHz    

Duplex seperation 45 MHz
RF carrier spacing     200 kHz
 
Number of TDMA slots on each carrier     8
 
Channel allocation     1 to 8 time slots per TDMA
 
One time slot (Physical channel)     0.577 ms
 
Frame Interval:     4.615 ms
 
Asymmetric data traffic     different time slots for Uplink and downlink
 
Frequency Hopping:     217 hops/s (slow)
 
Equalizer:     16 Ás time dispersion
 
Connectivity:     Packet switched data networks such as IP and X.25
 
Asymmetric data traffic     different time slots for Uplink and downlink
 
Modulation
Gateway GPRS Support Node (GGSN) and
Serving GPRS Support Node (SGSN)
 
Channel coding schemes :
CS-1 through CS-4, MCS1-MCS9

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    EDGE - Reverse/Forward Link
Composition
Packet data traffic channels
Packet common control channels
Packet dedicated control channels
 
 
Transmission
Channel coder
Block encoder
Precoding of Uplink Status Flag (USF)
Add Tail bits
Convolutional encoder
Puncturing
 
Channel coding schemes(in addition to GPRS)
Scheme
Peak Rate per slot (kbps)
RLC Block size Code
Rate
MCS-1
MCS-2
MCS-3
MCS-4
MCS-5
MCS-6
MCS-7
MCS-8
MCS-9
GMSK
GMSK
GMSK
GMSK
8-PSK
8-PSK
8-PSK
8-PSK
8-PSK
8.8
11.2
14.8
17.6
17.6
17.6
17.6
54.5
59.2
.5
.66
.75
1.0
1.0
.37
.49
.76
1.0
Reception
GMSK Demodulator
Viterbi equaliser
Deinterleaver
Viterbi decoding

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    EDGE - Standard Library Functions

The following is a list of the standard library functions to perform the various aspects of GPRS. These functions can be implemented in a DSP or the ARM RISC architecture. In general, the layer 1 functions are usually implemented in the DSP while upper layer protocols such as SNDCP are implemented in the ARM RISC. The channel models are used for simulating the channel operating environment and are not a function that would be implemented in a mobile handset or base station.

Channel codes
Block encoder
Fire coder
Precoding of uplink status flags
Convolutional coder (1/2, 2/3 and 3/4)

Puncturing
Interleaver / deinterleaver
Interleaver of depth 4 / deinterleaver
Channel models
Rayleigh distribution
Rice distribution
Propogation models for urban and rural areas
Modulation / Demodulation
GMSK modulation / demodulation

Channel Decoder
Viterbi decoder

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