北京大学学报(自然科学版)

一种基于单播方式提高VoWLAN系统话音容量的方案设计

王东1,刘志敏, 赵玉萍,罗艳,李红刚,乐济麟,曹阳   

  • 收稿日期:2006-01-05 出版日期:2007-01-20 发布日期:2007-01-20

A Novel Unicast Based Multiplexing Scheme to Improve the Capacity of VoWLAN

WANG Dong1, LIU Zhimin, ZHAO Yuping, LUO Yan, LI Honggang, LE Jilin, CAO Yang   

  • Received:2006-01-05 Online:2007-01-20 Published:2007-01-20

摘要: VoIP(IP语音)与WLAN(无线局域网)两者结合,产生了一种新型的无线话音传送平台:VoWLAN。针对WLAN的研究热点,分析了VoWLAN中存在的容量瓶颈,指出现有解决方案(M-M)存在的问题,提出一种基于单播方式提高VoWLAN话音容量的方案(U-M,Unicast Multiplexing),对VoIP业务性能进行了理论分析和仿真验证。结果显示,U-M方案相对于传统方案提高系统话音容量近一倍,相对于M-M方案丢包率降低10%左右,较好地保证了VoIP业务的服务质量。该方案在以话音业务为主的VoWLAN中节省了系统的功耗,是一种性能优良 的提高VoWLAN系统话音容量的方案。

关键词: IP语音, 无线局域网, 媒体访问控制, 丢包率, 时延特性

Abstract: The mergence of VoIP and WLAN created a new wireless platform for voice service delivery, VoWLAN. This paper figured out the capacity bottleneck of VoWLAN, and analyzed the problems in current solutions such as M-M. A novel unicast based multiplexing scheme (U-M, Unicast Multiplexing) to improve the capacity and performance of VoWLAN was proposed. Both theoretical and simulation results showed that this scheme improved the voice capacity to nearly 100% comparing to the traditional un-multiplexed scheme, and reduced the packet lost ratio by 10% compared with the M-M scheme. Meanwhile, the U-M scheme is a power-saving scheme in the voice-oriented application as well. Therefore the proposed U-M scheme is an effective solution to increase the voice capacity of WLAN and improve the performance of VoIP service.

Key words: VoIP, WLAN, MAC, packet loss rate, ETE delay

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