On the Spectrum Handoff for Cognitive Radio Ad Hoc Networks without Common Control Channel

Computer Science – Information Theory

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

book chapter of Cognitive Radio Mobile Ad Hoc Networks, Springer, July 2011

Scientific paper

Cognitive radio (CR) technology is a promising solution to enhance the spectrum utilization by enabling unlicensed users to exploit the spectrum in an opportunistic manner. Since unlicensed users are temporary visitors to the licensed spectrum, they are required to vacate the spectrum when a licensed user reclaims it. Due to the randomness of the appearance of licensed users, disruptions to both licensed and unlicensed communications are often difficult to prevent. In this chapter, a proactive spectrum handoff framework for CR ad hoc networks is proposed to address these concerns. In the proposed framework, channel switching policies and a proactive spectrum handoff protocol are proposed to let unlicensed users vacate a channel before a licensed user utilizes it to avoid unwanted interference. Network coordination schemes for unlicensed users are also incorporated into the spectrum handoff protocol design to realize channel rendezvous. Moreover, a distributed channel selection scheme to eliminate collisions among unlicensed users is proposed. In our proposed framework, unlicensed users coordinate with each other without using a common control channel. We compare our proposed proactive spectrum handoff protocol with a reactive spectrum handoff protocol, under which unlicensed users switch channels after collisions with licensed transmissions occur. Simulation results show that our proactive spectrum handoff outperforms the reactive spectrum handoff approach in terms of higher throughput and fewer collisions to licensed users. In addition, we propose a novel three dimensional discrete-time Markov chain to characterize the process of reactive spectrum handoffs and analyze the performance of unlicensed users. We validate the numerical results obtained from our proposed Markov model against simulation and investigate other parameters of interest in the spectrum handoff scenario.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

On the Spectrum Handoff for Cognitive Radio Ad Hoc Networks without Common Control Channel does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with On the Spectrum Handoff for Cognitive Radio Ad Hoc Networks without Common Control Channel, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the Spectrum Handoff for Cognitive Radio Ad Hoc Networks without Common Control Channel will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-65589

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.