Two-level Channel Multiplexing: A Novel Radio Resource Allocation Strategy for Satellite Digital Multimedia Broadcast System

Channel mapping is an important issue in the radio resource allocation scheme for the Satellite Digital Multimedia Broadcast (SDMB) system. Existing single-level channel multiplexing scheme performs well only when the bit rate of logical channel exactly matches the corresponding bit rate of the transport channel. In this paper, a novel 2-level channel multiplexing approach is proposed and developed. It performs channel multiplexing at both transport and physical channels, and applies optimised 2-stage bin-packing algorithm for the channel mapping. The results show that, in comparison with existing channel mapping schemes, our approach can require less number of transport channels, has better usage of the residual capacity on the transport channels, and can improve the total transmission capacity on the logical channels.