IEEE 802.11 WLAN支持语音与数据业务的自适应传输方案研究

李长乐; 李建东; 蔡雪莲

IEEE 802.11 WLAN支持语音与数据业务的自适应传输方案研究

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出版历程
- 收稿日期: 2003-11-18
- 修回日期: 2004-03-15
- 刊出日期: 2005-03-19

A Study of Self-adaptive Transmission for Integrated Voice and Data Services over an IEEE 802.11 WLAN

摘要

摘要: IEEE 802.11标准中的MAC协议当采用DCF和PCF时是一种随机竞争接入与轮询相结合的协议。该文通过仿真在分析研究此MAC协议对语音、数据业务综合传输性能的基础上,提出了一种支持语音与数据业务的自适应传输方案。仿真结果表明,在满足语音业务最大允许时延的前提下,自适应传输方案通过动态、合理地调整协议参数,可以提高数据业务的传输性能,从而增加网络容量。特别地,本方案不需要改动协议本身,易于实现。
- 无线局域网; IEEE802.11; 多址接入; 分组语音; 数据业务; 自适应传输
Abstract: The IEEE 802.11 standard MAC is a hybrid protocol of random access and polling when both DCF (Distributed Coordination Function) and PCF (Point Coordination Function) are used. On the base of the performance analysis of the MAC protocol for integrated data and voice transmission by simulation, this paper puts forward a self-adaptive transmission scheme to support multi-service over the IEEE 802.11 WLAN. The simulation results show that, on the premise of satisfying the maximum allowable delay of packet voice, the self-adaptive transmission scheme can improve the data traffic performance and increase the WLAN capacity through dynamic and appropriate adjustment of the protocol parameters. Especially, the scheme is easy to be realized for no change in the MAC protocol is needed.

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参考文献(1)

IEEE 802.11 WG. Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specification. 1999.[2]IEEE 802.11b WG. Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specification:High-Speed Physical Layer Extension in the 2.4 GHz Band. 1999.[3]IEEE 802.11a WG. Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specification:High-Speed Physical Layer in the 5 GHz Band. 1999.[4]Crow B P, Widjaja I, Kim J G, et al.. EEE 802.11 wireless local area networks. IEEE Communications Magazine, 1997, 35(9):116- 126.[5]Veeraraghavan M, Cocker N, Moors T. Support of voice services in IEEE 802.11 wireless LANs. INFOCOM 2001, Vol.1,Anchorage, 2001:488 - 497.[6]Prasad A R. Performance comparison of voice over IEEE 802.11 schemes. VTC99, Vol.5, Amsterdam, 1999:2636 - 2640.[7]Zahedi A, Pahlavan K. Capacity of a wireless LAN with voice and data services[J].IEEE Trans. on Communications.2000, 48(7):1160-[8]Zahedi A.[J].Pahlavan K. Voice and data integration on TCP/IP wireless networks. PIMRC97, Vol.2, Helsinki.1997,:-[9]Liu H H, Wu J L C. Packet telephony support for the IEEE 802.1lwireless LAN. IEEE Communications Letters, 2000, 4(9):286 - 288.[10]Suzuki T.[J].Tasaka S. Performance evaluation of integrated video and data transmission with the IEEE 802.11 standard MAC protocol. GLOBECOM99, Vol. IB, Rio de Janeiro.1999,:-[11]VisserM A.[J].Zarki M E. Voice and data transmission over an 802.11 wireless network. PIMRC95, Vol.2, Toronto.1995,:-[12]李长乐,李建东,蔡雪莲,等.支持语音业务的IEEE 802.11WLAN性能分析.西安电子科技大学学报,2003,30(7):1-5.

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