To meet increasing throughput, delay and reliability demands, future wireless networks will have to rely on increased cooperation both among nodes and among protocol layers in a node. This requires a wide variety of knowledge, from theoretical issues such as graph theory or information theory, to issues at the physical and network layers. A potential solution is the recently proposed network coding because it offers a number of desired properties such as resource efficiency, robustness and security. This paper focuses on two research directions for multimedia transmission over wireless networks based on network coding: (i) source-aware network coding and (ii) physical-layer network coding. These directions follow the cross-layer framework in designing the communication protocol stack. Challenging issues which are related to the practical design of network-coding enabled wireless networks are addressed and discussed.
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