Abstract
Standardization is currently in progress to specify Enhanced Data rates for GSM Evolution (EDGE). The two components of EDGE, Enhanced Circuit-Switched Data (ECSD) and Enhanced General Packet Radio Service (EGPRS), define enhancements for circuit-mode and packet-mode data, respectively. EGPRS is also intended to provide a high-rate North American digital time division multiple access (TDMA) packet data service. To achieve higher data rates, 8-ary phase shift keying (8-PSK) modulation has been introduced. Enhanced radio link control (RLC) procedures are being defined based on link adaptation and incremental redundancy to achieve superior delay/throughput performance over a wide range of operating conditions. This paper describes a candidate proposal for (RLC) block segmentation for EGPRS that provides combined link adaptation and incremental redundancy; short, fixed-length blocks to achieve lower block error rates; seamless transition between coding schemes without loss in throughput; segmentation to provide a robust Gaussian minimum shift keying (GMSK) fallback mode; and short and extended header formats. We present performance tradeoffs for the proposed scheme. Many of the features of this proposal have been included in the EGPRS specification. We provide a brief description of the block and header formats being standardized.
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