带抢占功能的WiMAX QoS接纳控制技术研究

摘要

As a typical way to achieve broadband wireless IP access,WiMAX technology has many advantages such as high rate,convenient architecture and mobility support.Admission control is one of the key technology in WiMAX which Ras profound impact on the system performance.This thesis analyzes the characteristics owned by admission control of WiMAX,presents Preemption Mechanism which allows real-time services to preempt the bandwidth of on going non-real time services by considering the limitation of existing mechanism and Borrow Mechanism,and shows simulation test.The results prove that by applying Preemption Mechanism,real-time services such as voice telephone which has high priority can be guaranteed from the view of traffic handling,so the problem that bandwidth was occupied by some non-real time services and real-time services were not able to be processed can be avoided.%WiMAX技术作为一种实现宽带无线IP接入的典型方式,具有速率高、架构使用方便、支持移动性等优点.接纳控制是WIMAX系统的关键技术之一,对系统性能有着极其重要的影响.本文分析了WiMAX接纳控制的固有特性,针对现有的常规机制和借用机制的缺陷,提出了一种可以使高优先级的实时业务抢占正在进行的低优先级非实时业务的服务带宽的抢占机制,并进行了仿真实验.实验结果表明,运用抢占机制,高优先级的语音电话等实时业务能够优先被处理,从而避免了一些非实时的业务长期占用带宽,而实时的业务得不到服务的情况发生.