Opportunistic spectrum access in cognitive radio networks

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Opportunistic spectrum access in cognitive radio networks: when to turn off the spectrum sensors

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ACM International Conference Proceeding Series archive
Proceedings of the 4th Annual International Conference on Wireless Internet table of contents

Maui, Hawaii

SESSION: Cognitive radio networks table of contents

Article No. 13

Year of Publication: 2008

ISBN:978-963-9799-36-3

Authors

Dan Xu	University of California, Davis, CA
Xin Liu	University of California, Davis, CA

Sponsors

: ICST
: Intel
: XIRRUS

Publisher

ICST (Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering) ICST, Brussels, Belgium, Belgium

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ABSTRACT

In cognitive radio networks, spectrum sensing is a critical to both protecting the primary users and creating spectrum access opportunities of secondary users. Channel sensing itself, including active probing and passive listening, often incurs cost, in terms of time overhead, energy consumption, or intrusion to primary users. It is thus not desirable to sense the channel arbitrarily. In this paper, we are motivated to consider the following problem. A secondary user, equipped with spectrum sensors, dynamically accesses a channel. If it transmits without/with colliding with primary users, a certain reward/penalty is obtained. If it senses the channel, accurate channel information is obtained, but a given channel sensing cost incurs. The third option for the user is to turn off the sensor/transmitter and go to sleep mode, where no cost/gain incurs. So when should the secondary user transmit, sense, or sleep, to maximize the total gain? We derive the optimal transmitting, sensing, and sleeping structure, which is a threshold-based policy. Our work sheds light on designing sensing and transmitting scheduling protocols for cognitive radio networks, especially the in-band sensing mechanism in 802.22 networks.

REFERENCES

Note: OCR errors may be found in this Reference List extracted from the full text article. ACM has opted to expose the complete List rather than only correct and linked references.

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