Teletraffic Analysis for the Performance Evaluation of De-Allocation/Re-Allocation Strategies in GSM/GPRS Cellular Networks

A teletraffic analysis for the performance evaluation of the joint use of dynamic resource allocation (DRA), channel de-allocation (DAS), and channel re-allocation (RAS) strategies in GSM/GPRS networks is developed. In addition, an efficient DRA strategy with a link quality awareness policy, channel de-allocation and re-allocation policies as well as user prioritization (called DRA LA DAS RAS) is proposed. To the authors´ knowledge, most related works have either studied link adaptation (LA) or dynamic resource allocation (DRA) strategies as independent topics but have failed to address their combined effect on GSM/GPRS systems. DRA LA DAS RAS uses both call degradation and call compensation techniques. Calls with the largest number of channels allocated and the worst link quality are degraded first. Conversely, calls with the lowest number of channels allocated and the best link quality are upgraded first. This allows upgraded calls to release resources more rapidly, making them readily available for new calls. Numerical results show that the proposed DRA LA DAS RAS strategy significantly improves system performance, i.e. up to 82% (74%) {58%} [37%] <27%> less blocking probability relative to the DRA (DRA LA with p=0.75) {DRA DAS} [DRA LA DAS with p=0.75] <DRA DAS RAS> strategy.