Abstract
The Carrier Sense Multiple Access with Collision Av oidance (CSMA/CA) based Medium Access Control (MAC) protocol uses a short request-to-send (RTS) and clear-to-send (CTS) contr ol packets prior of actual data packet transmission . The function of the CSMA/CA based MAC protocol in wireless communication is to facilitate wireless nodes (i.e. laptop, PC, smart p hones and etc) to access a wireless medium efficiently. Besides, it is also efficiently manage the wireless medium when more wire less nodes involving in transmission activity in the network. This protocol allows all wireless nodes in the network to commun icate between each other without collision. Since collisions may only occurr ed on the RTS control packets thus it can reduce th e actual data collision on the medium. The RTS/CTS control handshake provides bett er performance and reduce the duration of collision especially when long data packets are transmitted over wireless medium. Howev er, even though the CSMA/CA based MAC protocol work ing effectively and provides better throughput performance over single hop communication but it performance degrade signif icantly when directly applied in multihop Wireless Mesh Network (WMN). Th e reason behind this poor performance is due to the inefficient packet delivery of CSMA/CA based MAC protocol in multihop network. The exchange of RTS and CTS signaling that required at each hop throughout the multihop network eventually will cause the larg e overheads and subsequently degrade network throug hput. Therefore, in this paper, an enhancement of RTS/CTS handshake has been proposed in order reduces the signaling overheads and ultimately allows a smooth packet delivery in the multihop network with out any collision. In this work, the multihop netw ork performances are evaluated analytically in terms of throughput and overhead. I t is proven that the new method of RTS/CTS handshak e provides significant improvement in throughput and overhead.
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