一种基于单播方式提高VoWLAN系统话音容量的方案设计

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。

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

The mergence of VoIP and WLAN created a new wireless platform for voice service delivery, VoWLAN. Focusing on the hot spot of WLAN research, 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.