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A Simple MAC Protocol for Cognitive Wireless Networks Abdorasoul GHASEMI S. Mohammad RAZAVIZADEH Publication IEICE TRANSACTIONS on Communications Vol.E92-B No.12 pp.3693-3700 Publication Date: 2009/12/01 Online ISSN: 1745-1345 DOI: 10.1587/transcom.E92.B.3693 Print ISSN: 0916-8516 Type of Manuscript: Special Section PAPER (Special Section on Dynamic Spectrum Access) Category: Protocols Keyword: medium access control (MAC), opportunistic spectrum access, spectrum utilization, Full Text: PDF(410.2KB)>>
Summary: A simple distributed Medium Access Control (MAC) protocol for cognitive wireless networks is proposed. It is assumed that the network is slotted, the spectrum is divided into a number of channels, and the primary network statistical aggregate traffic model on each channel is given by independent Bernoulli random variables. The objective of the cognitive MAC is to maximize the exploitation of the channels idle time slots. The cognitive users can achieve this aim by appropriate hopping between the channels at each decision stage. The proposed protocol is based on the rule of least failures that is deployed by each user independently. Using this rule, at each decision stage, a channel with the least number of recorded collisions with the primary and other cognitive users is selected for exploitation. The performance of the proposed protocol for multiple cognitive users is investigated analytically and verified by simulation. It is shown that as the number of users increases the user decision under this protocol comes close to the optimum decision to maximize its own utilization. In addition, to improve opportunity utilization in the case of a large number of cognitive users, an extension to the proposed MAC protocol is presented and evaluated by simulation. | |||||
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