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題名 | Quality of Service Guarantee for Real-Time VBR Traffic Flows with Different Delay Bound and Loss Probability Requirements in WLANs= |
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作者 | Lee, Tsern-huei; Huang, Yu-wen; |
期刊 | Journal of The Chinese Institute of Engineers |
出版日期 | 20130600 |
卷期 | 36:4 2013.06[民102.06] |
頁次 | 頁471-487 |
分類號 | 448.6 |
語文 | eng |
關鍵詞 | Quality of service; Wireless LAN; Scheduling; |
英文摘要 | The Medium Access Control (MAC) 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 (HCCA), a contention-free channel access function of HCF, is only suitable for constant bit rate (CBR) traffic. For variable bit rate (VBR) traffic, packet loss may occur seriously. In this paper, we generalize the reference design with an efficient TXOP allocation algorithm, a multiplexing mechanism, and the 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. |
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