Mobile Ad Hoc Networks (MANETs) is an active research area with a number of proposals being made to support real-time applications that are based upon the interaction between the routing scheme and a QoS provisioning mechanism. This paper builds upon such ideas and presents QoS-aware Shortest Multipath Source (Q-SMS) routing protocol that have been shown to offer significant network improvement when compared to best protocol proposed schemes. Q-SMS essentially modifies the previously proposed SMS scheme to explicitly provide QoS assurance. The new proposed scheme allows nodes to obtain and then use estimation of the residual capacity to make appropriate admission control decisions. In this paper we compare a QOS-based, Robust Multipath Routing (QRMR) protocol for mobile ad hoc networks and a cross layer based multipath routing (CBRM) protocol to improve QoS in mobile ad hoc networks to allot weights to individual links, depending on the metrics link quality, channel quality and end-to-end delay is developed. This paper presents a new approach based on multipath routing backbones (MRB) for supporting enhanced QoS in MANETs. The objective of this multipath routing is to improve the reliability and throughput and favour load balancing. The bulkiness of our protocol achieves improved packet delivery ratio with reduced latency was established.
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