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下一代无线蜂窝网的关键问题之一是能够提供多业务服务,这就要求呼叫接入策略能够满足各种业务的不同Qos要求,同时有效地利用带宽资源。本文采用双阈值带宽预留策略处理多种业务呼叫的接入,并利用实验仿真比较分析了基于此策略的数据业务可变模型和数据业务排队模型的性能。仿真结果表明数据业务可变模型能够减小切换语音呼叫掉话率而且提高整个系统的性能,数据业务排队模型能够明显降低数据呼叫阻塞率并提高信道利用率。
One of the key issues of the next generation of wireless cellular networks is the ability to provide multiservice services. This requires that the call-access strategy be able to meet different Qos requirements for various services while efficiently utilizing bandwidth resources. In this paper, a dual-threshold bandwidth reservation strategy is adopted to handle the access of multiple service calls. The performance of the data service variable model and the data service queuing model based on this strategy is compared and analyzed by experimental simulation. The simulation results show that the data service variable model can reduce the call drop rate of voice calls and improve the performance of the whole system. The data traffic queuing model can significantly reduce the data call blocking rate and improve the channel utilization rate.