05-04-2012, 04:44 PM
Enhanced Data Rates for GSM Evolution
Enhanced Data Rates for GSM Evolution.docx (Size: 954.33 KB / Downloads: 30)
Enhanced Data rates for GSM Evolution (EDGE) (also known as Enhanced GPRS (EGPRS), or IMT Single Carrier (IMT-SC), or Enhanced Data rates for Global Evolution) is a digital mobile phone technology that allows improved data transmission rates as a backward-compatible extension of GSM. EDGE is considered a pre-3G radio technology and is part of ITU's 3G definition. EDGE was deployed on GSM networks beginning in 2003 — initially by Cingular (now AT&T) in the United States.
Evolved EDGE
Evolved EDGE improves on EDGE in a number of ways. Latencies are reduced by lowering the Transmission Time Interval by half (from 20 ms to 10 ms). Bit rates are increased up to 1 Mbit/s peak bandwidth and latencies down to 80 ms using dual carriers, higher symbol rate and higher-order modulation (32QAM and 16QAM instead of 8-PSK), and turbo codes to improve error correction. And finally signal quality is improved using dual antennas
Radio performances impact of EDGE implementation
EDGE is main influence on GSM is on the radio interface.
Upgrade of GSM network with EDGE will influence the radio
conditions
There is a need for carefull radio optimisation
EDGE throughput is highly dependent on interferences (C/I),
especially at the cells’ border
EDGE vs UMTS for indoor coverage
Robustness of Edge :
– Compensation of radio propagation fluctuation thanks to Link Adaptation
Instability of UMTS :
– Throughput Drop due to building penetration and the mobile « Power rise »
phenomenon.
EDGE Status Worldwide
Edge is a GSM - BSS feature to enable highest data throughput (proven
technology)
38 devices are currently Edge compatible
GSM Wireless Industry entirely committed to Edge
111 networks deploying Edge currently
35 commercially available Edge networks