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In this paper, a time-threshold based multi-guard bandwidth allocation scheme for voice calls is presented. The main idea of the new scheme is based on monitoring the elapsed real time of handoff calls and according to a time threshold (te) , a handoff call is either slightly-prioritized or fully-prioritized. A slightly-prioritized handoff call has higher priority than a new call and lower priority than a fully-prioritized handoff call. Also in this paper, the performances of different bandwidth allocation schemes are measured using a crucial general performance metric Z. Z, which is a performance/cost ratio, is a function of the new call blocking probability, handoff call dropping probability and system utilization all together. The simulation and analytical results show very good agreement. The results indicate that our scheme outperforms other traditional schemes in terms of performance/cost ratio, and maintains its superiority under different network circumstances.
Date of Conference: 29-31 July 2006