LEACH protocol for multimedia traffic with a variable-size packet

The limited energy resources of sensor nodes pose challenging issues on the development of protocols for WSN. Introducing clustering into hierarchical protocol reduces number of transmission in the network to reduce their energy deception, then to maximize network lifetime. But the LEACH case is not really reliable in the case of real-time traffic because real-time applications are characterized by their emergency to deliver data. We presented a technical with two dynamic parameters to improve QoS. Consist the first one is packet size and the second the next time to send data packets sensor on LEACH protocol. Those are varied depending on the state of network to stabilize network state in order to support multimedia traffic. In this ways we minimize delays gathering successive data packets from the same node. With the implementation of our technical in Network Simulator (ns2) we have improved QoS parameters including reducing network congestion end to end delay and traffic overload. Thereafter our result was compared with same preceding studies which consist of an evaluation of LEACH QOS behaviour subject to multimedia traffic.