摘要：
现有TCP机制无法有效区分网络丢包是拥塞丢包还是“失聪”丢包。针对该问题，提出一种在无线Mesh网络环境下跨层显示“失聪”丢包通告机制。该机制在系统使用定向天线条件下采用基于忙音的媒体接入控制机制区分数据丢包原因，通过IP和TCP跨层设计显示通告帧和定义的多跳转发规则向源端进行正确的通告。利用该机制对线性无线Mesh网络进行理论推导和分析，并通过数值实验证明其可行性和有效性。
关键词:
无线Mesh网络,
丢包通告机制,
定向天线,
跨层,
失聪,
拥塞丢包,
媒体接入控制
Abstract:
The existing TCP mechanisms can not effectively distinguish the cause of packet loss in wireless networks whether it is triggered by congestion or deafness. In order to solve the problem, this paper proposes a Cross-layer Explicit Deafness Notification(CLEDN) in wireless Mesh network. It adopts Media Access Control(MAC) based on busy tones when system uses directional antennas, and an explicit notification frame is designed between IP and TCP, which is passed to source node through the user-defined multi-hop forwarding rule. The mechanism is applied to theoretical deduction and analysis in linear wireless Mesh networks, and numerical analysis verifies its feasibility and validity.
Key words:
wireless Mesh networks,
packet loss notification mechanism,
directional antenna,
cross-layer,
deafness,
packet loss by congestion,
Media Access Control(MAC)
中图分类号:
廖勇, 王聪, 王丹, 徐昌彪. 一种无线Mesh网络跨层丢包通告机制[J]. 计算机工程, 2011, 37(13): 1-4.
LIAO Yong, WANG Cong, WANG Dan, XU Chang-Biao. Cross-layer Packet Loss Notification Mechanism in Wireless Mesh Networks[J]. Computer Engineering, 2011, 37(13): 1-4.