AAL2在无线网络中的性能分析

Performance Analysis of AAL2in Wireless Network

对于信道资源有限的无线通信网络,如何尽可能地提高信道利用率是首先要考虑的问题;而对于话音等实时业务,如何保证其服务质量也是一个非常关键的问题。为了有效地解决这两个问题,ITU-T和ATM论坛制订了AAL2适配标准。在该适配标准中有一个称为“Timer_CU”的参数,用于为信元传送的端到端时延提供保证,但在AAL2标准文档中并没有讨论如何设置该参数。通过分析这一参数对网络效率和端到端时延的影响,为如何合理设置这一参数值提供了一定的依据。

The limited amount of bandwidth available in wireless network necessita tes an efficient uti-lization of the bandwidth.It is also very important to guarantee the QoS t o some realtime services.So AAL2has been standardized by ITU -T and ATM Forum to resolve these two problems .In the specifications,it is not standardized on how to set a vital parameter called Timer_CU.In thi s paper,we analyze the effect of this parameter on bandwidth efficie ncy and end -to -end delay,and get som e result of how to set the value of the parameter reasonably.