Mobility

A Study of TCP Performance in Wireless Environment Using Fixed-Point Approximation

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Executive Summary

Loss of IP packets occurring as a result of imperfect local error correction is one of the major reasons for TCP performance degradation in wireless networks. These losses are misinterpreted by TCP senders as congestion indications and subsequently lead to the sharp decrease of the sending rate. In addition to wireless losses, packets can be lost as a result of buffer overflows at the IP layer. To study performance experienced by TCP sessions sharing a wireless channel, the authors adopt the fixed-point approximation. To do so, they distinguish between two modes of operation: packet losses are mainly caused by imperfect error correction, and the packet loss process is dominated by the buffer overflow.

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