Evolution from 2G to LTE (Part 3 – EDGE)

GSM Edge TEchnology

Beyond GPRS, EDGE(Enhanced Data rates for GSM Evolution) 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.

Transition to EDGE technology is expensive, because modulation system is changing and new medias are coming. Beside these, BTSes must be upgraded and new handsets must be used.

EDGE Protocol Stack

Some Important Points for EDGE

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 Uplink Reverse ch. 890 – 915 MHz
Base Station Downlink 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 Chn) : 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 µs time dispersion
Connectivity : Packet switched data networks such as IP and X.25
Asymmetric data traffic : different time slots for Uplink and downlink
Channel coding schemes : CS-1 through CS-4, MCS1-MCS9

You can continue with the other Evolution from 2G to LTE articles…

Evolution from 2G to LTE (Part 1 – GSM)
Evolution from 2G to LTE (Part 2 – GPRS)
Evolution from 2G to LTE (Part 3 – EDGE)

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