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The performance degradation of TCP in wireless and wired-wireless hybrid networks is mostly due to lack of its ability to differentiate the packet losses caused by network congestions from the wireless transmission losses. In IEEE 802.16 networks, wireless loss can occur due to wireless link errors and when the number of bandwidth requests exceeds the maximum. ARQ retransmits the blocks in these two cases repeatedly for a specified number of times till the expiry of block life time and drops the block if the transmission is not successful. Block life time and Request Retries for bandwidth requests are static parameters which are set by the service provider irrespective of the current Round Trip Time, wireless nature and network load.
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