An adaptive random access strategy for multi-channel relaying networks |
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Authors: | Fan Jiang Hui Tian Ping Zhang |
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Affiliation: | Key Laboratory of Universal Wireless Communications, Ministry of Education, Wireless Technology Innovation Institute, Beijing University of Posts and Telecommunications, Beijing 100876, China |
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Abstract: | In this paper, an adaptive random access strategy is presented for multi-channel relaying networks to address the issue of
random access of the non-real-time (NRT) services. In the proposed scheme, NRT services access the base station (BS) by first
accessing the nearest relay node (RN). When collision occurs, for the sake of fast and efficient access, the user will begin
a frequency domain backoff rather than randomly retry in time domain. A remarkable feature of this scheme is that the RN will
adaptively determine the maximum allowed frequency backoff window at each access period. This is achieved according to the
new arrival rate as well as the number of available access channels. Moreover, to alleviate the interference caused by sub-channel
reuse among RNs, a fractional frequency reuse scheme is also considered. The analysis and numerical results demonstrate that
our scheme achieves higher throughput, lower collision probability and lower access delay than conventional slotted Aloha
as well as the scheme without frequency backoff window adaptation. |
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Keywords: | multi-channel relay random access backoff policies interference coordination |
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