標題: Quality of service guarantee for real-time VBR traffic flows with different delay bound and loss probability requirements in WLANs
作者: Lee, Tsern-Huei
Huang, Yu-Wen
傳播研究所
Institute of Communication Studies
關鍵字: quality of service;wireless LAN;scheduling
公開日期: 2013
摘要: The medium access control of IEEE 802.11e defines a novel coordination function, namely hybrid coordination function (HCF), which allocates transmission opportunity (TXOP) to stations taking their quality of service (QoS) requirements into account. However, the reference TXOP allocation scheme of HCF controlled channel access, a contention-free channel access function of HCF, is only suitable for constant bit rate traffic. For variable bit rate (VBR) traffic, serious packet loss may occur. In this article, we generalize the reference design with an efficient TXOP allocation algorithm, a multiplexing mechanism, and an associated admission control unit to guarantee QoS for VBR flows with different delay bound and packet loss probability requirements. We define equivalent flows and aggregate packet loss probability to take advantage of both intra-flow and inter-flow multiplexing gains so that high bandwidth efficiency can be achieved. Moreover, the concept of weighted-loss fair service scheduling is adopted to allocate the aggregate TXOP to individual flows. From numerical results obtained by computer simulations, we found that our proposed scheme meets QoS requirements and results in much higher bandwidth efficiency than previous algorithms.
URI: http://hdl.handle.net/11536/22455
http://dx.doi.org/10.1080/02533839.2012.732264
ISSN: 0253-3839
DOI: 10.1080/02533839.2012.732264
期刊: JOURNAL OF THE CHINESE INSTITUTE OF ENGINEERS
Volume: 36
Issue: 4
起始頁: 471
結束頁: 487
顯示於類別:期刊論文


文件中的檔案:

  1. 000320028500006.pdf