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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。
For wireless communication networks with limited channel resources, how to improve channel utilization as much as possible is the first issue to be considered; and how to guarantee the quality of service for real-time services such as voice is also a crucial issue. In order to effectively address these two issues, the ITU-T and ATM Forums have developed the AAL2 adaptation standard. There is a parameter called “Timer_CU” in this adaptation standard, which is used to guarantee the end-to-end delay of cell transmission. However, this parameter is not discussed in the AAL2 standard document. By analyzing the influence of this parameter on the network efficiency and end-to-end delay, it provides a basis for how to set this parameter value reasonably.