Study and Experiment on Transport Protocol for Network Greening

在对网络设备节能方案和节能路由的性能评估中，假设流量为UDP，即到达交换机/路由器的流量时变较小。因此，降低这些设备的链路/端口上的传输速率是有效的。但是，假设TCP流量，根据传输路径上的流量有一定的流量/拥塞控制机制，由于实际带宽的减少，导致性能下降。在本研究中，我们首先研究了高效节能路由的有效路径选择方案，然后提出了能量感知的TCP，其中数据（段）的传输根据其路径上的利用率强制延迟，以节省电力，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.