Routing in multi-radio, multi-hop wireless mesh networks
Proceedings of the 10th annual international conference on Mobile computing and networking
Proceedings of the 11th annual international conference on Mobile computing and networking
Characterizing the capacity region in multi-radio multi-channel wireless mesh networks
Proceedings of the 11th annual international conference on Mobile computing and networking
A high-throughput path metric for multi-hop wireless routing
Wireless Networks - Special issue: Selected papers from ACM MobiCom 2003
Cooperative diversity in wireless networks: Efficient protocols and outage behavior
IEEE Transactions on Information Theory
Cooperative communication in wireless networks
IEEE Communications Magazine
Distributed Channel Assignment and Routing in Multiradio Multichannel Multihop Wireless Networks
IEEE Journal on Selected Areas in Communications
Cognitive Wireless Mesh Networks with Dynamic Spectrum Access
IEEE Journal on Selected Areas in Communications
Reliable link routing in cognitive radio networks
CAR'10 Proceedings of the 2nd international Asia conference on Informatics in control, automation and robotics - Volume 3
QoS multicast routing in cognitive radio ad hoc networks
International Journal of Communication Systems
Routing in Distributed Cognitive Radio Networks: A Survey
Wireless Personal Communications: An International Journal
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Cognitive radio has been proposed in recent years to promote spectrum efficiency by exploiting the existence of spectrum holes. The heterogeneity of both spectrum availability and traffic demand among secondary users has brought significant challenge for efficient spectrum allocation in cognitive radio networks. Observing that spectrum resource can be better matched to traffic demand of secondary users with the help of relay nodes, in this paper we propose to utilize cooperative relays to assist the transmission and improve spectrum efficiency. Different from traditional cooperative communication within a single channel, in our scheme a relay node may be selected for a link to bridge the link's source and destination using its different common channels with those two nodes. With these new logical links composed of both direct link and relay link, new routing protocols are needed so that end-to-end performance can be better improved. Therefore, we define a new link cost, relay-aware link cost, which considers several aspects including channel availability, channel condition, channel utilization and potential relays. Based on this link cost, a relay-assisted routing (RAR) protocol is proposed which includes routing discovery and local adjustment. Simulation results demonstrate the effectiveness of the proposed routing scheme.