Link Layer Buffer Size Distributions for FTP and HTTP/1.0 Applications in an IS-2000 System

In this document, we provide the adaptation and retransmission buffer size distributions for an HTTP and FTP application in an IS-2000 system. The results are given for different TCP window size, TCP segment size, air link FER and data rates. For HTTP application, the number of parallel TCP connections is limited to either 1 or 4. We found that smaller (larger) adaptation buffers (larger retransmission buffers) are required at higher data rates. Moreover, for error free transmission over the air link, a large fraction of data (from TCP window) stays in the adaptation buffers while for the case of link errors, the required size for retransmission buffers is also large. The maximum retransmission buffer size is a function of the air link RTT (i.e., number of rounds of RLP NAKs) and is independent of the link error rate.