摘要
针对IEEE802.11e Medium Access Control层的QoS机制高负载时存在远端节点冲突和低优先级业务资源被耗尽的问题,提出在牺牲较小带宽的基础上增加一条忙音信道,取代CTS帧在数据信道上的广播,减少远端节点的冲突.仿真结果表明,该方案具有较小的冲突概率,有效地减少了远端节点冲突.同时提出一个解决公平性问题的新思路:在避退时间发送忙音抢占信道,以期提高低优先级业务的接入概率.
The IEEE802.11e MAC layer QoS mechanism has two problems： low-priority traffic depletion and remote node collision under high loads. To reduce remote nodes collisions, a busy-tone channel is added at the cost of low bandwidth to replace the broadcasting of CTS frames in data channel. The simulation results indicate the modifcafion, with lesser collision probability, can reduce remote node collisions effectively. Meanwhile, a new idea for fairness issue is proposed： seizing channel by sending busy tone during back off time to increase the access possibility of lowpriority traffic.
出处
《南通大学学报（自然科学版）》
CAS
2009年第3期6-9,共4页
Journal of Nantong University(Natural Science Edition)
基金
国家自然科学基金项目(60872002)
江苏省高校自然科学重大基础研究项目(07KJA51007)
