In a wireless LAN, since two or more terminals in a service area do the random access in a signal channel, it is necessary to achieve an efficient access that reduces the frame collision. Under the standard IEEE 802.11 protocol, each terminal sets a random backoff. Collision avoidance are being achieved while it generates useless standby time and acheives low throughput. To solve that problem, this paper proposes a channel access method which fixed backoff after success transmission. Via simulation, the proposed method reduces frame collisions and improves throughput . Furthermore, our method provides less frame loss probability and smaller file transfer delay.

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In web service, the server is normally responsible for the connection termination. That would produce useless connections. In this paper, to improve quality of web service, we propose two methods in which a client terminates the connection, and evaluate their performance via simulation. One method is to terminate a persistent connection under HTTP/1.1 by the client. As the simulation result, we confirmed the effectiveness of this method by comparing with the existing one. The other method is that, by using a TCP reset packet, a client terminates the suspended connection which is revealed when the client quits the browse. As the simulation result, we confirmed that this method reduces a connection loss probability when the listenbacklog parameter value is large.

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