Performance Analysis of TCP Enhancements in Satellite Data Networks
AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING
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This research examines two proposed enhancements to the well-known Transport Control Protocol TCP in the presence of noisy communication links. The Multiple Pipes protocol is an application-level adaptation of the standard TCP protocol, where several TCP links cooperate to transfer data. The Space Communication Protocol Standard - Transport Protocol SCPS-TP modifies TCP to optimize performance in a satellite environment. While SCPS-TP has inherent advantages that allow it to deliver data more rapidly than Multiple Pipes, the protocol, when optimized for operation in a high-error environment, is not compatible with legacy TCP systems, and requires changes to the TCP specification. This investigation determines the level of improvement offered by SCPS-TPs Corruption Mode, which will help determine if migration to the protocol is appropriate in different environments. As the percentage of corrupted packets approaches 5 , Multiple Pipes can take over five times longer than SCPS-TP to deliver data. At high error rates, SCPS-TPs advantage is primarily caused by Multiple Pipes use of congestion control algorithms. The lack of congestion control, however, limits the systems in which SCPS-TP can be effectively used.
- Radio Communications