Abstract-The design of efficient packet scheduling algorithms, which play a key role in the radio resource management (RRM), is crucial for the multimedia delivery in the satellite digital multimedia broadcasting (SDMB) system. In this paper, a novel packet scheduling scheme, which uses the cross-layer approach in its design, is proposed. This scheme comprises a new service prioritization algorithm and a dynamic rate matching based resource allocation algorithm, aimed at utilizing both the applications' QoS attributes and the physical layer data rate information. The performance of the proposed scheme has been evaluated via simulation. In comparison with existing schemes, the proposed scheme achieves significant performance gain on delay, delay variation and physical channel utilization.Index Terms-Cross-layer design, DDQ, dynamic rate matching, packet scheduling, RRM, SDMB.

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SUMMARYThe inherent broadcast capabilities of satellites make them an attractive solution for the delivery of multimedia services to mobile users in third generation (3G) networks. Reliable delivery of content over a hostile land-mobile satellite channel is one of the key technical system requirements that can be addressed at different protocol layers. In this paper, we focus our attention on some of the mechanisms which can provide partial reliability: the packet-level forward error correction (PLFEC) technique in radio access network (RAN), different interleaving depths at physical layer (inter frame) and power allocation in the satellite radio interface. We rely on an end-to-end simulation platform in order to assess the performance gain achieved by these mechanisms separately, and provide clear indications for the achievable benefits at system level when some of these mechanisms act in co-ordination rather than in isolation.