Abstract
Previous TCP performance investigations for wireless systems focus on TCP throughput degradation due to packet loss on the error-prone wireless link. Since cellular mobile networks like GPRS and UMTS include a strong link layer error protection, using adaptive Forward Error Correction and Automatic Repeat Request schemes, a bad quality of the wireless link does not mainly result in IP packet loss but rather in an additional packet delay. Furthermore TCP congestion control has to deal with hand-offs and temporary link layer disconnections in cellular mobile networks leading to a significant packet delay variation and packet disordering. This paper analyzes the performance of TCP in cellular mobile networks, focusing on the packet delay and disordering problem. We find spurious retransmissions and TCP timeouts being a dominant cause for throughput degradation. Finally we propose an algorithm to filter spurious TCP retransmissions at the Base Station to increase TCP performance and increase overall wireless link capacity.
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