Interaction Between Multi-User Diversity Scheduling And TCP Flow Control Mechanisms

Transport Control Protocol has achieved great success in wired networks, but has performed poorly in wireless environment. Higher bit error rate, bigger data transmission delay and more disconnections of wireless links would be caused by multi-path fading, co-channel interferences, host mobility. When TCP mistakenly initiates the combined slow start with congestion avoidance algorithm to slow down the traffic sent over the connection as a response to a segment loss due to the reasons existing uniquely in wireless networks, the TCP performance in terms of throughput and end-to-end delay degrades significantly and unnecessarily. Thus, there are many researches on link-layer and network-layer protocol and algorithm improvement.Non-real-time traffic is generally allocated to transfer through shared channel; in this case, the design of link-layer scheduling mechanisms, which, is an important part of link-layer protocol research, would influence data transmission performance. The final goal of the scheduling mechanisms design is maximizing wireless resource utilization and meeting the QoS demand of users. Nowadays, there are many research on wireless packet scheduling algorithms, most of which have guaranteed the QoS demand of users at link-layer, however, not take the interaction characteristic between link-layer scheduling and TCP flow control mechanisms as consideration. We find that, through computer simulation, the interaction characteristic between link-layer scheduling and TCP flow control mechanisms is: On one hand, TCP...