Conference Paper

A Comparison of Multicast Adaptive Techniques in Reliable Delivery over GEO Satellite Networks

Dept. of Comput. & Commun. Syst., Univ. Putra Malaysia, Serdang
DOI: 10.1109/VETECS.2009.5073287 Conference: Vehicular Technology Conference, 2009. VTC Spring 2009. IEEE 69th
Source: IEEE Xplore


In this paper, we compare two multicast adaptive techniques for reliable data delivery in GEO satellite networks. Specifically, a channel-aware scheduling algorithm is compared with a multicast link adaptation technique, in the face of fluctuating channel conditions in downlink. The aim of the techniques is to maximise system throughput whilst increasing resource utilization. The scheduling technique is implemented within one forward bearer subtype, whereas the link adaptation mechanism considers transmission rates from a list of possible forward bearer subtypes. Simulation results are analysed and it is found that multicast link adaptation technique outperforms channel-aware scheduling algorithm, in terms of reduced session delay and retransmitted number of segments.

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    • "A brief survey of adaptive unicast transmission protocols is available in [1]. Previous contributions to adaptive multicast transmission include [2], which requires the source to estimate the states of all D channels from the source to the destinations, and [3], which requires each destination to know the signal-to-noise ratio (SNR) on its incoming link from the source. No channel or parameter estimation is needed for our adaptive multicast transmission protocol. "
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    ABSTRACT: A low-complexity protocol is described and evaluated for adaptation of the modulation and coding for multicast transmission in half-duplex packet radio networks. The adaptive multicast transmission protocol is designed to compensate for changes in propagation conditions that occur from packet to packet during a session with one sender and multiple receivers. The protocol relies on simple receiver statistics to obtain the control information for adapting the modulation and coding, and it also provides scheduling to avoid collisions among acknowledgments from the receivers. The throughput provided by the protocol is compared with performance results for hypothetical ideal adaptive multicast transmission protocols that are given perfect channel state information. We illustrate the importance of adaptive modulation and channel coding in systems that employ fountain coding for packet erasure correction.
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