Abstract: By combining multiple packets in a single broadcast transmission, network coding can greatly improve the ca- pacity of multi hop wireless networks. I}his paper proposed a diffscrv-based network coding protocol (DI3NC) for hetero- geneous wireless sensor networks. The main idea is to compute periodically the mean and standard deviation of resi-dual energy of nodes, together with a dynamic node classification. On this basis, the QoS reduirements are mapped to network coding metrics. For this purpose, we introduced an energy-aware forwarding mechanism for coded-packet. Meanwhile, a multi-priority packet scheduling strategy was designed to increase the opportunities for coding. Our simulation results demonstrate that DI3NC achieves a significant improvement in energy efficiency, as well as in reliability of data transmis- lion.

Key words: Heterogeneous wireless sensor networks, Wireless network coding,DiffServ, Energy-aware