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应用于4G系统的动态优先级切换算法研究

Research on Dynamic Priority Queue Handover Scheme with 4G System

【作者】 赵晶

【导师】 张英海; 王卫东;

【作者基本信息】 北京邮电大学 , 微电子学与固体电子学, 2008, 硕士

【摘要】 当今,第三代移动通信已经逐渐商业化,对于下一代移动通信系统的研究也引起了广泛的关注。随着移动通信技术的发展,人们对于移动业务的需求日益增多,数据业务占据越来越重要的地位,视频通话、网络业务等都将成为未来的主要业务。未来的移动通信系统必须能够提供针对不同业务的服务质量(quality of service,QoS),所以对于下一代移动通信系统的无线资源管理技术的研究具有重要的意义。切换过程在移动通信过程中是一个比较特殊的阶段,期间移动台需要完成从一个服务基站过渡到另一个服务基站的连接,切换算法的优劣直接影响着整个系统的性能。在4G系统中,移动业务将会更加的多样化,切换需要适应不同的QoS需求。针对不同业务在切换中的特性不同,本文提出一种动态优先级排队(dynamic priority queue,DPQ)切换算法。在DPQ切换算法中,创新性的为业务设置优先级函数,并且根据排队业务的等待时间动态调整优先级函数的大小,在接收端设置通用队列管理器对排队业务进行统一管理,充分考虑到了各种业务的QoS需求,防止优先级低的业务始终得不到服务。另外,将小区资源分等级预留,从而保证高优先级的业务的服务。仿真结果显示,DPQ切换算法在保证话音业务的情况下,使各种分组业务的阻塞率和掉话率得到了很大的改善。

【Abstract】 The 3rd generation (3G) mobile communications is coming into commercial applications, and the next generation (Beyond 3G and 4G) mobile communications is being researched extensively. With the development of mobile telecommunication technology and the increasing requirement for various digital services, digital services are more important in B3G and 4G systems. The next generation (Beyond 3G and 4G) mobile communications need to provide quality of service (QoS) for different traffics, so the research of radio resource management (RRM) for the next generation mobile communications is very important.The handover is the special process in the mobile communicaton. During the handover process, the mobile station will connect the target base station instead of the original base station. So the handover scheme influences system performance directly.Mobile service will be more various and handover have to adapt different quality-of-service (QoS) requirements of all kinds of service in 4G mobile communication systems. In the paper, a dynamic priority queue handover scheme is proposed. With the scheme, the innovative priority function is set and the common queue manager (CQM) is appended. The priority in the queue can be changed according to the variety of waiting delay. Furthermore, the resource is graded and reserved, which can insure the access of high priority service. The proposed handover scheme, which is adapted to different QoS requirements, can significantly improve the system performance, and reduce the drop rate and the block rate.

【关键词】 4G切换服务质量动态优先级队列资源预留
【Key words】 4GHandoverQoSDynamic priority queueResource reserved
  • 【分类号】TN929.5
  • 【下载频次】243
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