An Adaptive Packet Injection Rate Control Protocol to Support Priority-based QoS Provisioning in Ad hoc Network with Directional Antenna

The rising popularity of multimedia applications and potential commercial usage of Mobile Ad hoc network (MANET) clearly indicates that Quality of Service (QoS) support in MANETs is an unavoidable task. Essentially, Multimedia traffic should get preference over conventional data traffic during communication through some kind of priority-based mechanism to assure a timely and guaranteed delivery of multimedia data. In this paper, we have proposed a scheme for supporting QoS in MANET by classifying the traffic flows in the network into different priority classes, and giving different treatment to the packet injection rate of the flows belonging to different classes. In our suggested scheme, the MAC protocol of any intermediate node of a flow detects the presence of high priority traffic in its neighborhood (transmission/reception zone) and back-propagates this knowledge back to the source which then can adaptively control packet injection rate of the low priority flow. This will ensure the high priority flow to get desired access to the medium to maintain its flow-rate.