Multi-Hop Wireless Networks - Improved Congestion Control Mechanism

Multi-hop wireless networks are the networks in which the communication is performed from one node to another using various intermediate nodes. Such networks are built using existing wireless protocols based on IEEE 802.11 and IEEE802.11e which are having various techniques to handle the congestion in the network. The basic idea of handling congestion is to use DROPTAIL protocol, which starts dropping packets as soon the as the networks starts congesting. This research focuses on the issue of handling congestion control by dropping packets, which leads to resend the packets again by the downstream nodes once the congestion is reduced. The process is more verse due to reproduction of packets at random times. In this paper, a new approach of controlling congestion is being proposed on the basis of a few more information maintained by nodes locally to slow down the network traffic inflow so that information shall not be gathered on a node and hence no need of dropping access packets in the network. The mechanism proposed is having various threshold values of the queue and flow rates decided in advance locally on each node and on occurrence of RTS (request to send) signal, CTS (clear to send) signal is sent back if and only if queue is not full or on the ratio of flow rates already decided.

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