Effective TXOP Allocation Scheme for Real-Time VBR Traffic Flows with Different Delay Bounds

نویسندگان

  • Tsern-Huei Lee
  • Yu-Wen Huang
چکیده

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 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 propose a TXOP allocation scheme to efficiently allocate bandwidth and meet the QoS requirements in terms of both delay bound and packet loss probability. To achieve high bandwidth efficiency, we take advantage of not only intra-flow multiplexing gain of traffic flows with large delay bounds but also inter-flow multiplexing gain of multiple traffic flows with different delay bounds. According to numerical results obtained by computer simulations, our proposed TXOP allocation scheme results in much higher bandwidth efficiency than previous algorithms under the same constraints of delay bounds and packet loss probability.

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Effective transmission opportunity allocation scheme for real-time variable bit rate traffic flows with different delay bounds

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تاریخ انتشار 2007