Exploiting buffers in cognitive multi-relay systems for delay-sensitive applications

Authors:
Yan Chen;Vincent K. N. Lau;Shunqing Zhang;Peiliang Qiu
Affiliations:
Institute of Information and Communication Engineering, Zhejiang University, Haagzhou, China;Department of Electronic and Computer Engineering, Hong Kong, University of Science and Technology, Kowloon, Hong Kong;Department of Electronic and Computer Engineering, Hong Kong, University of Science and Technology, Kowloon, Hong Kong;Institute of Information and Communication Engineering, Zhejiang University, Haagzhou, China
Venue:
WiOPT'09 Proceedings of the 7th international conference on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks
Year:
2009

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Abstract

Cognitive and cooperative technologies are two core components in the design of next generation wireless networks. One key issue associated with cognitive transmission is the inefficient spectrum sharing of the secondary system, especially for secondary communications separated by long distance. To boost the spectrum sharing efficiency, cognitive multi-relay system appears to be an attractive solution for the cognitive transmission systems. In this paper, we consider a cognitive multi-relay (CMR) system and propose a novel CMR buffered decode-and-forward protocol that exploit the buffers in the source and each relay node. Moreover, we derive the closed-form average end-to-end delay and the stability region by exploiting the birth-death nature of the queue dynamics and the methods of state aggregation and queue dominance. Comparing with the baseline protocols through analytical and numerical results, the proposed CMR-BDF scheme can dynamically adjust the cognitive transmission to exploit the spatial PU burstiness while simultaneously benefits from the advantage of double-sided selection diversity in both the source-relay and relay-destination interfaces.