Improvement of TCP Performance on Asymmetric Channels Based on enhancements of Compressing TCP/IP Header Algorithm

摘要

Since asymmetric channels will be common in the emerging Internet, the compressing TCP/IP header algorithm in RFC1144 is regarded as a key solution to a low-speed ack channel. However, this algorithm has a problem in nature, i.e., if one frame containing ack is discarded due to frame CRC error, the successive acks within the window will be discarded, that results in the throughput degradation on channel downstream. To solve this problme, we propose two algorithms: (1) introduce a counter to control sending compressed and uncompressed header; (2) define a new compressed header alternatively. The simulation resutls show that the proposed algorithms significantly improve the TCP performance.