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arXiv 1002.1687cs.NI
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多跳Ad Hoc网络的无线拥塞控制协议

Wireless Congestion Control Protocol For Multihop Ad Hoc Networks

Mahendra kumar. S, Senthil Prakash. K

摘要:

传统的TCP拥塞控制机制在IEEE 802.11 MAC协议应用于多跳Ad hoc网络时,遇到了许多新的问题,性能受到影响。许多问题是由于MAC层的介质争用造成的。本文首先说明了严重的介质竞争和拥塞是紧密耦合的,TCP的拥塞控制算法粒度过粗,导致吞吐量不稳定和过长的延迟。进一步,我们说明了TCP的严重的不公平性问题,由于介质竞争和总吞吐量和公平性之间的权衡。然后,基于新的使用信道繁忙率,一个更准确的度量来表征网络的利用率和拥塞状态,我提出了一个新的无线拥塞控制协议(WCCP),有效地和公平地支持多跳ad hoc网络中的传输服务。在该协议中,沿业务流的每个转发节点执行节点间和节点内的公平资源分配,并相应地确定MAC层反馈。端到端的反馈最终由流中的瓶颈节点决定,并被带回到源以控制其发送速率。大量的仿真结果表明,WCCP显着优于传统的TCP的信道利用率,延迟和公平性,并消除饥饿问题。

英文摘要:

The traditional TCP congestion control mechanism encounters a number of new problems and suffers a poor performance when the IEEE 802.11 MAC protocol is used in multihop ad hoc networks. Many of the problems result from medium contention at the MAC layer. In this paper, I first illustrate that severe medium contention and congestion are intimately coupled, and TCP s congestion control algorithm becomes too coarse in its granularity, causing throughput instability and excessively long delay. Further, we illustrate TCP s severe unfairness problem due to the medium contention and the tradeoff between aggregate throughput and fairness. Then, based on the novel use of channel busyness ratio, a more accurate metric to characterize the network utilization and congestion status, I propose a new wireless congestion control protocol (WCCP) to efficiently and fairly support the transport service in multihop ad hoc networks. In this protocol, each forwarding node along a traffic flow exercises the internode and intranode fair resource allocation and determines the MAC layer feedback accordingly. The endtoend feedback, which is ultimately determined by the bottleneck node along the flow, is carried back to the source to control its sending rate. Extensive simulations show that WCCP significantly outperforms traditional TCP in terms of channel utilization, delay, and fairness, and eliminates the starvation problem.

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