Ad Hoc网络中支持拥塞控制的速率自适应协议  

Auto Rate Protocol with Congestion Control for Multi-Hop Ad Hoc Networks

作　　者：夏海轮[1] 丁炜[1] 

机构地区：[1]北京邮电大学宽带通信网络实验室,北京100876

出　　处：《吉林大学学报（信息科学版）》2007年第3期292-299,共8页Journal of Jilin University（Information Science Edition）

基　　金：国家自然科学基金资助项目(60372101);高等学校博士学科点专项科研基金资助项目(20040013010)

摘　　要：Ad Hoc网络中节点需要竞争共享信道,容易使部分节点发生拥塞而丢弃部分分组,造成带宽资源浪费。为了更有效地利用Ad Hoc网络物理层的多速率能力,提出了一种支持拥塞控制的速率自适应协议,引入了可变发送窗口机制,接收节点根据信道质量选择可用的最高传输速率,并根据其队列拥塞程度控制发送端节点的发送窗口,发送节点按照发送窗口的大小连续发送多个数据帧。仿真结果表明,该协议能够充分利用信道条件,在网络重负载的条件下,饱和吞吐量提高80%,并能够调整拥塞节点的分组进出速率,有效地控制了网络拥塞。Nodes in wireless multi-hop Ad Hoc networks need to contend for the shared wireless channel, which could result in congestions and waste the wireless bandwidth resource. To utilize the multirate capability of Ad Hoc physical layer more efficiently, an ACC-AR （Adaptive Congestion Control-Auto Rate） protocol is proposed with dynamic transmission window mechanism. The receiver sets the highest feasible transmission rate allowed by the channel condition, and controls the sender＇s transmission window according to its congestion level. The sender then transmits the back-to-back DATA frames according to the value of transmission window. The simulation results show that ACC-AR can effectively utilize the channel condition, increase the network saturation throughput by about 80% under heavy network load, and achieve congestion control in the MAC （ Media Access Control） layer.

关 键 词：速率自适应 多速率 拥塞控制 AD Hoe网络 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]