| 摘要: |
| 在MANET 中,通信节点的移动会造成端到端通信路由的时常中断.传统TCP 协议只有拥塞控制机制,对由于节点移动造成的数据包传输丢失和超时也作为拥塞处理,使得端到端传输性能低下.为解决这一问题,采用跨层设计思想,将传输控制与链路稳定性路由结合,提出了一种基于链路生存时间概率的传输控制协议(transmission control protocol based on probability of link residual lifetime,简称TCP-PLRT).该协议通过在路由稳定时跨层收集路由层链路生 |
| 关键词: 传输控制协议 跨层 路由中断 链路稳定性路由 链路生存时间概率 |
| DOI：10.3724/SP.J.1001.2011.03840 |
| 分类号: |
| 基金项目:国家重点基础研究发展计划(973)(2009CB320405); 国家科技重大专项(2010ZX03005-002) |
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| Cross Layer Transmission Control Protocol Interacting with Link Reliable Routing in MANET |
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SUN Jie, GUO Wei
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National Key Laboratory of Science and Technology on Communications, University of Electronic Science and Technology of China, Chengdu 611731, China
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| Abstract: |
| Routing fails frequently because of the node mobility of MANET. The regular TCP works badly in MANET because the congestion control algorithm takes all the problems in MANET (disconnections, route changes, etc.) as congestion. To improve the efficiency of end to end transmission, this paper proposes a cross-layer transmission control protocol that interacts with link reliable routing protocols, which are called TCP-PLRT (transmission control protocol based on probability of link residual lifetime). TCP-PLRT judges the stability of end to end connection through information about the probability of the link residual lifetime that feedback from routing layer. Three complementary mechanisms have been proposed: ROUTING SWITCH, if the link is not stable enough, SAVE THEN FORWARD, if the link is about to break, and ACK RECONFIRM, if the routing has been rebuilt. Therefore, TCP-PLRT can do prediction before routing failure, and do remediation after it happens. It has been shown by computer simulation that results of TCP-PLRT have significantly improved the packet loss, caused by routing failure, and have increased the throughput much more. |
| Key words: transmission control protocol cross layer routing failure link reliable routing probability of link residual lifetime |
