CONGESTION BASED ROUTE RECOVERY TECHNIQUE
For Manet · 2013
In mobile adhoc network (MANET), the previous work of the authors considered route recovery technique based on route failures alone and doesn’t consider the packet drops due to congestion. The congestion is likely to occur when incoming traffic exceeds the network capacity which results in increased delay and packet loss. In order to overcome these issues, in this paper, congestion detection and recovery technique is proposed in mobile ad hoc network. In this technique, each node estimates the parameters such as queue length, data rate, and medium access control (MAC) contention. The upper and lower limit of these parameters is compared and node is marked with the congestion status such as normal, medium or high level. When data is to be transmitted from the source to destination, the intermediate nodes along the path verify its congestion status. If the congestion status of any one node is high or congestion status of more than one node is medium, a warning message will be sent to the source. The source then selects the alternate congestion free path for data transmission. By simulation results, it is estimated that the proposed technique reduces the packet drop due to congestion and increases the packet delivery ratio.