无线双通道网络话音业务信道接入性能分析

摘要

无线双通道网络能够有效解决战术环境下码分组网数目过小造成的码分资源浪费问题。混合业务传输环境下，实时话音业务信道接入性能是衡量无线双通道网络性能的关键指标之一。通过使用一种理想的固定时分信道带宽分配方案，在保障话音业务传输实时性的条件下，分别从单跳网络拓扑和多跳网络拓扑结构给出了双通道网络可用信道数目。使用基于优先权的混合业务多服务台离散时间排队模型分析了双通道网络的话音业务平均数目、呼叫阻塞概率、平均网络吞吐量和信道利用率等性能。数值计算结果证明：相比传统网络，双通道网络在混合业务高负载条件下能够容纳更多的话音业务并具有更低的呼叫阻塞概率。%Dual-channel network( DCN) can reduce code resource wastage caused by the condition that a fewer subnets are needed for the tactical very high frequency( VHF) network with code division networking scheme. Under the hybrid services transmission environment,the channel access performance of real-time voice service is one of the key issues to evaluate DCN performance. In this paper,an ideal fixed channel bandwidth allocation scheme based on time division mechanism is employed to analyze the available chan-nel number in DCNs. Then a hybrid service multi-server discrete slot queue model based on access priori-ty is used to derive the network state transition probability and steady state probability distribution. The mathematical expressions of average number, call blocking probability, average network throughput and channel utilization efficiency of voice services in DCNs are also devided according to the model. Numerical results demonstrate that,compared with the traditional network,DCN can own a higher voice service num-ber and a lower call blocking probability.