Journal of Computer Applications ›› 2011, Vol. 31 ›› Issue (05): 1162-1165.DOI: 10.3724/SP.J.1087.2011.01162

• Network and communications • Previous Articles     Next Articles

Improving VoIP capacity in mobile WiMAX network through traffic priority

LI Ming1,WU Yan-ling2,YANG Lei1,HAN Qing-tao1   

  1. 1. School of Electronic Engineering, Dongguan University of Technology, Dongguan Guangdong 523808, China
    2. Department of Computer and Science Information, City College, Dongguan University of Technology, Dongguan Guangdong 523106, China
  • Received:2010-11-03 Revised:2011-01-01 Online:2011-05-01 Published:2011-05-01
  • Contact: WU Yan-ling

移动WiMAX网络中的VoIP调度机制

李明1,吴燕玲2,杨雷1,韩清涛1   

  1. 1. 东莞理工学院 电子工程学院,广东 东莞 523808
    2. 东莞理工学院城市学院计算机与信息科学系,广东 东莞 523106
  • 通讯作者: 吴燕玲
  • 作者简介:李明(1971-),男,江西南昌人,副教授,硕士,主要研究方向:移动通信、计算机网络; 吴燕玲(1971-),女,江西南昌人,讲师,硕士,CCF会员,主要研究方向:计算机网络、无线通信; 杨雷(1964-),男,河南邓州人,教授,博士,主要研究方向:网络通信; 韩清涛(1965-),男,河北沧州人,副教授,硕士,主要研究方向:图像处理、图像识别。
  • 基金资助:

    国家自然科学基金资助项目(10890095);东莞市高等院校科研机构科技计划项目(2008108101022;200910814047;201010814018)。

Abstract: Five scheduling mechanisms have been proposed to ensure Quality of Service (QoS) in WiMAX network. Three of them are designed for real-time applications. However, fairness has not been considered while assigning resources in these scheduling mechanisms. In order to guarantee the existing services, new service requests will be rejected when lacking network resources. For resolving this problem, a new scheduling mechanism was proposed for Voice over Internet Protocol (VoIP) service, in which a Priority Decision Maker (PDM) was implanted. When new services and the existing services requested resources simultaneously, higher priority would be assigned to new service requests; and resource allocation would be achieved based on different level priorities by a resource distribution center for guaranteeing fairness. Detailed performance analysis was performed. The simulation results show the proposed scheduling mechanism could significantly increase number of VoIP connections and total throughput, about 15% and 11% respectively.

Key words: mobile Worldwide interoperability for Microwave Access (WiMAX), scheduling mechanism, service priority, Voice over Internet Protocol (VoIP) service, fairness

摘要: 移动微波存取全球互通(WiMAX)网络使用了5种调度机制来保证服务质量,其中的3种被设计用于实时性业务。但是,这3种调度机制都缺乏公平性。在资源不足的时候,通过丢弃新用户的请求来保证旧用户的服务质量(QoS)。为此,针对WiMAX中的因特网语音(VoIP)服务提出了一种基于优先权的新调度机制。该机制中,不同用户的业务请求将被赋予不同的优先权。新旧用户同时请求资源时,新用户的请求拥有更高的优先权;资源分配中心再根据优先权的高低为用户分配资源,从而在最大限度上保证了资源分配的公平性。仿真结果显示,新调度机制可以将网络中的因特网语音服务的连接数和总吞吐量分别提高15%和11%左右。

关键词: 移动微波存取全球互通, 调度机制, 业务优先权, 因特网语音服务, 公平性