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Performance Improvement of ARQ Protocol using HARQ Feedback Information in IEEE 802.16m Systems  

Lee, Jong-Min (서강대학교 전자공학과)
Hong, Dae-Hyoung (서강대학교 전자공학과)
So, Jae-Woo (서강대학교 전자공학과)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.35, no.12A, 2010 , pp. 1136-1144 More about this Journal
Abstract
In this paper, the effects of HARQ feedback error are evaluated in IEEE 802.16m system when the HARQ and ARQ interactions that utilize the HARQ feedback information is used. Also, the HARQ and ARQ interaction scheme considering HARQ feedback errors are proposed. The HARQ and ARQ interaction scheme improve the system throughput by using the HARQ feedback information instead of the ARQ feedback message, which reduce retransmission time. However, errors in the HARQ feedback information generate severe performance degradation. Especially, the local NAK errors between HARQ feedback error critically degrade the performance, because the local NAK errors lead the loss of ARQ blocks. We propose a channel state-based schemes for HARQ and ARQ interactions to mitigate the throughput degradation due to HARQ feedback errors. Simulation results show that the proposed scheme improves the throughput and the delay performance.
Keywords
ARQ; IEEE 802.16m; interactions; HARQ residual error; Local NAK;
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