Optimization of Learning Time for Learning-Assisted Rendezvous Channel in Cognitive Radio System

Osamu TAKYU  Takayuki YAMAKITA  Takeo FUJII  Mai OHTA  Fumihito SASAMORI  Shiro HANDA  

IEICE TRANSACTIONS on Communications   Vol.E98-B   No.2   pp.360-369
Publication Date: 2015/02/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E98.B.360
Type of Manuscript: PAPER
Category: Terrestrial Wireless Communication/Broadcasting Technologies
cognitive radio,  rendezvous channel,  Channel Occupancy Rate (COR),  

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This paper derives the optimal learning time for the learning-assisted rendezvous channel. One problem with the dynamic spectrum access system of cognitive radio is access channel mismatch between two wireless terminals. In the learning-assisted rendezvous channel, before exchanging packets for link connection, the rate of channel occupancy by the other system is estimated within the learning time; it is referred to as the channel occupancy rate (COR). High speed packet exchange is made possible by selecting a low COR channel. However, the optimal learning time and the impact of COR estimation errors have not been clarified yet. This paper analyzes the time to rendezvous channel (TTR), where TTR is the time needed to complete the rendezvous with a certain probability. The results indicate that the learning time and TTR have a concave relationship which means that the optimal learning time can be determined.