The problem of guaranteeing Quality-of-Service (QoS) routing in wireless sensor networks (WSNs) with node mobility is a difficult problem, even without possible interference from external radio sources. Difficulties arise because node mobility can cause frequent network topology changes, communication channels can have high error rates, the jitter rate is high and several different applications can be sharing the use of the communication medium. In this paper we propose a reliable and robust QoS routing protocol for WSNs based on a Combined Weight (CW) Value. The CW is based on the QoS parameters link quality, residual energy and available bandwidth. In addition to this, we propose an adaptive rate control mechanism in order to avoid congestion losses. By simulation results, we show that our proposed protocol is reliable and robust when compared to existing routing protocol. General TermsCombined Weight, Adaptive Rate.

Mobile Ad-Hoc Networks (MANETs) are characterized by multi-hop wireless connectivity, frequently changing network topology and the need for efficient dynamic routing protocols.Routing must maintain required paths in such an environment with an acceptable overhead. On-Demand routing protocols discover paths only when they are requested by flooding the request through the network at great cost. Caches are used to reduce the frequency of flooding route requests. Many routing protocols exist for MANETs. On-demand routing protocols have attracted more attention because of their less overhead and wide applicability. This study is on the behavior of DSR protocol, which is based entirely on on-demand behavior.Multipath routing is gaining importance as it increases reliability and aids in load balancing. More traffic than that can be handled by the IFQ of a node reduces throughput and increases routing overhead . In this work an effort is made to integrate the benefits of multipath routing and traffic sensitive routing. Simulation studies show enhanced throughput for Traffic Sensitive Dynamic Source Routing (TSDSR) when compared to DSR.