Rate Allocation and Adaptation for Incremental Redundancy Truncated HARQ

Abstract : This paper considers incremental redundancy hybrid ARQ (HARQ) transmission over independent block-fading channels. The transmitter, having no knowledge of the instantaneous channel state information (CSI) can or -- allocate the transmission rate knowing the statistics of the channel, or -- adapt the transmissions rates using the outdated CSI, i.e., the one experienced by the receiver in the past transmissions that resulted in a packet decoding failure. Aiming at throughput maximization problems under constraint on the outage probability, we show how to optimize the rate-adaptation and rate-allocation policies using dynamic programming framework. Numerical examples obtained in a Rayleigh-fading channel show that rate adaptation provides notable gains over a rate allocation and non-adaptive HARQ, and, for high SNR, only a few transmissions are necessary to approach closely the ergodic capacity.
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https://hal-supelec.archives-ouvertes.fr/hal-00827950
Contributor : Pierre Duhamel <>
Submitted on : Thursday, May 30, 2013 - 7:07:37 AM
Last modification on : Thursday, April 12, 2018 - 10:56:02 AM

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Leszek Szczecinski, S. Khosravirad, Pierre Duhamel, M. Rahman. Rate Allocation and Adaptation for Incremental Redundancy Truncated HARQ. IEEE Transactions on Communications, Institute of Electrical and Electronics Engineers, 2013, 61 (6), pp.2580 - 2590. ⟨10.1109/TCOMM.2012.041113.120462⟩. ⟨hal-00827950⟩

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