Optimal throughput analysis of multiple channel access in cognitive radio networks

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In this paper we consider a time slotted cognitive radio (CR) network with N wireless channels and M secondary users (SUs). We focus on a multiple channel access policy where each SU stochastically decides whether to access idle channels or not based on the given access probability (AP) that is adapted to the channel state information (CSI), if possible. The AP plays an important role in the random access policy because it can control the number of SUs who can access idle channels in a simple manner and hence alleviate packet collisions among SUs. We assume that each SU can access at most L idle channels simultaneously at a time slot whenever possible. We consider three cases—(a) all SUs have full CSI, (b) all SUs have no CSI, and (c) all SUs have partial CSI. We analyze the throughput of an arbitrary SU for the three cases, and rigorously derive a closed-form expression of the optimal AP values that maximize the throughput of an arbitrary SU for the three cases. From the analysis, we show the impact of multiple channel access and the acquisition of CSI on throughput performance.
Publisher
SPRINGER
Issue Date
2019-06
Language
English
Article Type
Article
Citation

ANNALS OF OPERATIONS RESEARCH, v.277, no.2, pp.345 - 370

ISSN
0254-5330
DOI
10.1007/s10479-017-2648-3
URI
http://hdl.handle.net/10203/262357
Appears in Collection
MA-Journal Papers(저널논문)EE-Journal Papers(저널논문)
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