Study and Experiment on Transport Protocol for Network Greening

在网络设备节能方案和节能路由的性能评估中，流量被假定为UDP，即到达交换机/路由器的业务量的时间变化相对较小。因此，降低这种设备的链路/端口上的传输率是有效的，只需要它们上的业务量。然而，由于假设传输路径上的流量具有一定的流量/拥塞控制机制，导致实际带宽的降低而导致性能下降，本文首先研究了一种有效的节能路径选择方案，在此基础上提出了一种能量感知的TCP协议，该机制根据路径上的利用率强制延迟数据(段)的传输，同时增加传输数据(段)的数量以缓解传输性能下降。

On performance evaluation of power-saving scheme of network equipments and energy efficient routing, traffic has been assumed to UDP, namely, time variance of the amount of traffic arriving at switches/routers is relatively small. Therefore, it is effective to reduce the transmission rate on links/ports of such equipments with only the amount of traffic on them. However, by assuming TCP traffic, which has some flow/congestion control mechanism in accordance with the amount of traffic on transmission path, it results in performance degradation of due to the reduction of actual bandwidth.In this study, we firstly investigated the effective path selection scheme for energy efficient routing and then proposed the energy-aware TCP in which data(segments) transmission is forced to delay in accordance with the utilization on its path for power-saving and the amount of transmission data(segments) is simultaneously increasing for relieving transmission performance degradation.