Geometric Spanners for Wireless Ad Hoc Networks
ICDCS '02 Proceedings of the 22 nd International Conference on Distributed Computing Systems (ICDCS'02)
Capacity of multi-channel wireless networks: impact of number of channels and interfaces
Proceedings of the 11th 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
NeXt generation/dynamic spectrum access/cognitive radio wireless networks: a survey
Computer Networks: The International Journal of Computer and Telecommunications Networking
Multicast capacity for large scale wireless ad hoc networks
Proceedings of the 13th annual ACM international conference on Mobile computing and networking
Multicast capacity for hybrid wireless networks
Proceedings of the 9th ACM international symposium on Mobile ad hoc networking and computing
The capacity of wireless networks
IEEE Transactions on Information Theory
Achievable rates in cognitive radio channels
IEEE Transactions on Information Theory
Dynamic spectrum access in open spectrum wireless networks
IEEE Journal on Selected Areas in Communications
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This work studies the capacity limits of Cognitive Radio (CR) networks with a hybrid relay scheme in which PRimary (PR) nodes dominate the spectrum usage, while coordinating with secondary or CR nodes in forwarding packets. This is in contrast to previous efforts that are focused on the analysis with cooperative relay scheme where only secondary (CR) nodes participate in relay operation [1]-[3]. Intuitively, it is expected that the hybrid scheme can improve network capacity because primary nodes have higher power and transmission capacity compared to CR nodes and data transmission with hybrid relay scheme can be much faster and more reliable. Therefore, we aim to investigate such potential benefits with respect to cooperative relay. However, we find that given the total data rate W, number of usable channels ||C|| and the number of CR nodes n in a network, the achievable capacity of CR networks with hybrid relay is of the order of Θ(W/||C||n). This result is much lower than the capacity of cooperative relay, which is of the same order as the capacity of multi-channel wireless networks (e.g., multi-channel multi-radio (MC-MR) networks), Θ(W1/√n log n). It is plausible that PR nodes can potentially become bottlenecks when they are used as high-priority relay nodes in the hybrid scheme. Thus, our study suggests that for delay-sensitive applications such as realtime traffic, hybrid relay is a good option; otherwise, cooperative relay is preferred.