Opportunistic Multiple Access for Cognitive Radio Networks
- 24 March 2011
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Journal on Selected Areas in Communications
- Vol. 29 (4), 704-715
- https://doi.org/10.1109/jsac.2011.110404
Abstract
In this paper, opportunistic multiple access to the under-utilized channel resources is investigated. Exploiting source burstiness, secondary cognitive nodes utilizes primary nodes' periods of silence to access the channel and transmit their packets. Cognitive relays could also make use of these silence periods to offer spatial diversity without incurring bandwidth efficiency losses. First, we consider the cognitive cooperation protocol and propose two different relay assignment schemes. Comparison between the proposed schemes is carried out through a maximum stable throughput analysis of the network. Then, secondary nodes access to the remaining idle channel resources is investigated. Queueing theoretical analysis and numerical results reveal that despite the fact that relays occupy part of the idle resources to provide cooperation, secondary nodes surprisingly achieve higher throughput in the presence of relays. The rationale is that relays help primary nodes empty their queues at faster rates, therefore, secondary nodes observe increased access opportunities to the channel.Keywords
This publication has 15 references indexed in Scilit:
- Cooperative Communications and NetworkingPublished by Cambridge University Press (CUP) ,2008
- Cognitive multiple access via cooperation: Protocol design and performance analysisIEEE Transactions on Information Theory, 2007
- Achievable rates in cognitive radio channelsIEEE Transactions on Information Theory, 2006
- Implementation issues in spectrum sensing for cognitive radiosPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2005
- Cognitive radio: brain-empowered wireless communicationsIEEE Journal on Selected Areas in Communications, 2005
- Stability of N interacting queues in random-access systemsIEEE Transactions on Information Theory, 1999
- Stability conditions for some distributed systems: buffered random access systemsAdvances in Applied Probability, 1994
- On the stability of interacting queues in a multiple-access systemIEEE Transactions on Information Theory, 1988
- Performance evaluation of multiple access spread spectrum systems in the presence of interferenceIEEE Transactions on Vehicular Technology, 1988
- The stability of a queue with non-independent inter-arrival and service timesMathematical Proceedings of the Cambridge Philosophical Society, 1962