Mobile ad hoc networks (MANETs) are characterized by its dynamic topology which has limited channel bandwidth and limited power at the nodes. Because of these characteristics in the MANETs the paths connecting source nodes with destinations may be very unstable and go down at any time, making communication over mobile ad hoc networks difficult. To overcome these issues, in this paper, we propose a Multipath QoS Routing protocol for traffic splitting in MANET. In this protocol, initially multiple disjoint paths are discovered and the data packets are transmitted through the path which satisfies the routing constraints based on bandwidth, delay and path stability. If the path does not satisfy the routing constraints, then the traffic can be distributed along the multiple disjoint paths, using the Traffic Splitting algorithm. By simulation results, we show that the proposed protocol reduces the packet drop and delay with improved throughput.
The loss recovery techniques ARQ and error correction coding mechanisms have some drawbacks. By combining these proactive and reactive techniques, we can design a hybrid loss recovery technique which will achieve better performance. In this paper, a hybrid loss recovery technique is proposed for multipath routing. The sender initiates encoding process using partial network coding and then forwards the coded data to intermediate nodes for re-encoding. After reprocessing the encoding packets, the intermediate nodes forward those packets to the receiver for decoding operations without the need of all encoded packets. Suppose if the proactive mechanism fails to help all receivers to recover the lost packet reactive mechanism is used that consisting of Automatic Repeat Request (ARQ) protocol, which use, retransmission mechanism for those packets are lost by sending ACK from the receiver to sender. By simulation results, we show that the proposed protocol reduces the packet drop and delay with improved throughput.Keywords-ARQ protocol, proactive and reactive mechanisms.
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