Ad hoc wireless networks provide infrastructure-free communication, an efficient MAC protocol through which mobile stations can share a common broadcast channel is essential. Present medium access mechanism used are Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA), multiple access with collision avoidance (MACA) and CSMA/CA with RTS/CTS. These protocols are designed to reduce the collision probability between multiple stations accessing a medium. CSMA/CA with RTS/CTS and MACA use RTS/CTS exchange mechanism to reserve the channel. In this paper, First theoretical model of WLAN is developed and the maximum possible throughput is calculated. In later part of the paper, for the verification of theoretical mode, simulation environment is developed and detailed simulation is performed using GloMoSim simulator. Finally theoretical and simulation result are compared, which shows the variation of throughput with the variation of packet arrival rate and variation of average end to end delay with throughput.
Hidden node is a fundamental problem that affects any wireless network where nodes cannot hear each other and leads to data packet collision. IEEE 802.11 wireless networks employ RTS/CTS mechanism for avoiding DATA packet collision .The main design assumption in this method is that all the nodes in the vicinity of a sender and a receiver must hear the RTS and CTS packets. They also defer their transmission appropriately. In this paper first scenarios are discussed which leads to DATA packet collision. In the later part of the paper an analytical model is developed by taking queuing and retransmissions. Expression for probability of packet collision is then derived. Finally detail simulation is performed. Analytical and simulation results are compared as well as the variation of packet error is calculated. Results are presented which show the variation of packet error with the variation of service time and packet arrival rate. These results can be used in future for the evaluation of throughput and delay of the system.
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