Coordinated Non-Sensing MAC Protocol in Dynamic Spectrum Access Networks

Authors:
Bih-Hwang Lee;Chi-Ming Wong
Affiliations:
Department of Electrical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan 106;Department of Electrical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan 106
Venue:
Wireless Personal Communications: An International Journal
Year:
2011

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Abstract

In this paper, we propose a coordinated non-sensing medium access control (MAC) protocol in dynamic spectrum access networks namely distributed coordinated dynamic spectrum reservation (DCDSR) protocol, which is not based on the cognitive radio technology. All licensed users (LUs) and unlicensed users (UUs) have two transceivers operating in a common control channel and licensed data channels to access control and data packets in the corresponding control and data frames respectively. LUs will inform UUs which channels will be used in next data frame and then UU reserve one of remainder channels by contending with each other during contention interval (CI) in control frame. The available channels which can be reserved by UUs will depend on the channel utilization of LUs and further affect the throughput of UUs. Whenever UU successfully reserves channel in a CI, it will start access the channel in next data frame. This will cause the wasted idle time for UUs which have successfully reserved channel and wait to enter next data frame. UU which couldn't successfully reserve channel in current control frame should try to reserve again in next control frame. Thus, the duration of CI will affect the delay and wasted idle time of UUs. We analyze and simulate the performance of throughput, delay and wasted idle time in DCDSR. The analytical and simulation results show that the proposed DCDSR performs very well.