Performance evaluation of a single-slot packet data channel in GSM

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Abstract
Within ETSI SMG, a general packet radio service (GPRS) is being specified as part of GSM Phase 2+. GPRS may be based on a new type of logical radio channel optimized for packet data. Thus, the need has arisen to evaluate, through simulations, the performance of such a channel. The simulation model used is based upon a preliminary system description and an assumed radio link protocol. This paper presents an investigation of the performance of one (master) single-slot packet data channel. The emphasis is put on finding the optimum coding scheme which gives the best performance in terms of throughput, packet delay (mean value together with 95% confidence interval) and channel stability. Special attention is given to the points where the input load doubles the delay across the air-interface compared to the delay at low input load. The random access based packet reservation mechanism is also highlighted because optimization in the slotted random access strategies have a direct impact on the overall throughput of the data channel. Furthermore, the use of appropriate adaptive backoff policies can result in stable throughput-delay characteristics. The results are compared to the values stated in "Requirements of General Packet Radio Service (GPRS)" which is a working document in the standardization process.

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