TY - JOUR
T1 - Dynamic spectrum access in heterogeneous unlicensed wireless networks
AU - He, Jianhua
AU - Zhang, Yan
AU - Kaleshi, Dritan
AU - Munro, Alistair
AU - McGeehan, Joseph
N1 - Copyright 2011 Elsevier B.V., All rights reserved.
PY - 2008/7/1
Y1 - 2008/7/1
N2 - Existing wireless systems are normally regulated by a fixed spectrum assignment strategy. This policy leads to an undesirable situation that some systems may only use the allocated spectrum to a limited extent while others have very serious spectrum insufficiency situation. Dynamic Spectrum Access (DSA) is emerging as a promising technology to address this issue such that the unused licensed spectrum can be opportunistically accessed by the unlicensed users. To enable DSA, the unlicensed user shall have the capability of detecting the unoccupied spectrum, controlling its spectrum access in an adaptive manner, and coexisting with other unlicensed users automatically. In this article, we propose a radio system Transmission Opportunity-based spectrum access control protocol with the aim to improve spectrum access fairness and ensure safe coexistence of multiple heterogeneous unlicensed radio systems. In the scheme, multiple radio systems will coexist and dynamically use available free spectrum without interfering with licensed users. Simulation is carried out to evaluate the performance of the proposed scheme with respect to spectrum utilisation, fairness and scalability. Comparing with the existed studies, our strategy is able to achieve higher scalability and controllability without degrading spectrum utilisation and fairness performance.
AB - Existing wireless systems are normally regulated by a fixed spectrum assignment strategy. This policy leads to an undesirable situation that some systems may only use the allocated spectrum to a limited extent while others have very serious spectrum insufficiency situation. Dynamic Spectrum Access (DSA) is emerging as a promising technology to address this issue such that the unused licensed spectrum can be opportunistically accessed by the unlicensed users. To enable DSA, the unlicensed user shall have the capability of detecting the unoccupied spectrum, controlling its spectrum access in an adaptive manner, and coexisting with other unlicensed users automatically. In this article, we propose a radio system Transmission Opportunity-based spectrum access control protocol with the aim to improve spectrum access fairness and ensure safe coexistence of multiple heterogeneous unlicensed radio systems. In the scheme, multiple radio systems will coexist and dynamically use available free spectrum without interfering with licensed users. Simulation is carried out to evaluate the performance of the proposed scheme with respect to spectrum utilisation, fairness and scalability. Comparing with the existed studies, our strategy is able to achieve higher scalability and controllability without degrading spectrum utilisation and fairness performance.
KW - dynamic spectrum access
KW - scalability
KW - fairness
KW - spectrum utilisation
KW - simulation
KW - spectrum access control
KW - unlicensed wireless networks
KW - DSA
KW - cognitive radio
UR - http://www.scopus.com/inward/record.url?scp=73949125429&partnerID=8YFLogxK
UR - http://www.inderscience.com/dev/search/index.php?action=record&rec_id=19204
U2 - 10.1504/IJAACS.2008.019204
DO - 10.1504/IJAACS.2008.019204
M3 - Article
AN - SCOPUS:73949125429
SN - 1754-8632
VL - 1
SP - 148
EP - 163
JO - International Journal of Autonomous and Adaptive Communications Systems
JF - International Journal of Autonomous and Adaptive Communications Systems
IS - 1
ER -