一种新的卫星网络传输控制协议

为了解决TCP协议在卫星通信网络中性能差的问题，该文提出了一种适合卫星网络的新型传输控制协议TP-Satellite。为了加速在连接开始阶段拥塞窗口(cwnd)增涨速度，该协议不再采用传统的Slow Start策略，而是采用一种新的窗口增涨策略超起始策略。为了将误码与网络拥塞造成的数据丢失区分开，协议还采用基于不同优先级IP数据交错发送的丢失判断策略。另外，协议采用了主动周期应答策略。通过理论分析和仿真比较，TP-Satellite协议能够迅速提升数据发送速率和有效地区分数据丢失原因，明显提高前向链路的吞吐量，同时降低反向链路的带宽占用。

A Novel Transmission Control Protocol for Satellite Networks

To address the problem that TCP performance degrades significantly on the Satellite communication networks, a new transport control protocol, TP-Satellite is introduced. In order to increase the Congestion Window (cwnd) rapidly at the beginning of data transmission, the traditional Slow Start strategy is replaced by a new strategy, named as Super Start. In order to decouple congestion decision from errors, a new scheme, which is based on two class priority IP packets alternately sending, is included in TP-Satellite. Bandwidth asymmetry problem is addressed by adoption of a ACK periodically sending strategy. Theoretical analyses and simulations indicate that TP-Satellite can increase the sending rate rapidly, discriminate the reason of packet loss effectively, enhance throughput performance significantly, and reduce the bandwidth used in the reverse path sharply.