CAJ | 학술논문

研究了移动Ad Hoc网络中的媒体接入控制问题. 首先, 基于IEEE 802. 11媒体接入控制协议, 提出了应用于MANET网络媒体接入控制的2个机制: 自适应回退窗转发优先机制(FPF)和多跳链邀请发送机制(MFCTI). FPF机制根据业务优先级自适应调整竞争窗大小, 而MFCTI机制则充分利用了网络层路由信息和无线传播的广播特性. 在此基础上对所提出的机制进行了仿真研究并与原IEEE 802. 11媒体接入控制进行了比较. 结果表明, 所提机制可以有效地提高网络吞吐率, 降低端对端迟延, 缓解网络局部拥塞, 从而提高了MANET网络的性能. 其另一优点是只需对IEEE 802. 11媒体接入控制作少量的补充和改动.
연구료이동Ad Hoc망락중적매체접입공제문제. 수선, 기우IEEE 802. 11매체접입공제협의, 제출료응용우MANET망락매체접입공제적2개궤제: 자괄응회퇴창전발우선궤제(FPF)화다도련요청발송궤제(MFCTI). FPF궤제근거업무우선급자괄응조정경쟁창대소, 이MFCTI궤제칙충분이용료망락층로유신식화무선전파적엄파특성. 재차기출상대소제출적궤제진행료방진연구병여원IEEE 802. 11매체접입공제진행료비교. 결과표명, 소제궤제가이유효지제고망락탄토솔, 강저단대단지연, 완해망락국부옹새, 종이제고료MANET망락적성능. 기령일우점시지수대IEEE 802. 11매체접입공제작소량적보충화개동.
The medium access control (MAC) issue is discussed in mobile Ad Hoc networks (MANETs). Based on the IEEE 802. 11 MAC protocol, this paper proposes two schemes, the forward-packet-first (FPF) scheme based on the adaptive backoff contention window and multihop forward chain transmission by invitation (MFCTI) scheme. In the FPF scheme, the contention window is adjusted adaptively according to the traffic priority. Route information and the broadcast characteristic of radio are utilized in MFCTI scheme. The performance of these schemes is studied in multihop environments by simulations. The results show that the proposed schemes can improve the network throughput, reduce the end-to-end average delay, and mitigate local congestion effectively. Another attractive feature is that the schemes can be implemented with minor modifications to the IEEE 802. 11 MAC.