Research Article
Exploiting Buffers in Cognitive Multi-Relay Systems for Delay-Sensitive Applications
@INPROCEEDINGS{10.1109/WIOPT.2009.5291602, author={Yan Chen and Kin Nang Lau and Shunqing Zhang and Peiliang Qiu}, title={Exploiting Buffers in Cognitive Multi-Relay Systems for Delay-Sensitive Applications}, proceedings={7th International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks}, publisher={IEEE}, proceedings_a={WIOPT}, year={2009}, month={10}, keywords={cognitive multi-relay system (CMR) PU burstiness buffered decode-and-forward (BDF) stability/delay analysis}, doi={10.1109/WIOPT.2009.5291602} }- Yan Chen
Kin Nang Lau
Shunqing Zhang
Peiliang Qiu
Year: 2009
Exploiting Buffers in Cognitive Multi-Relay Systems for Delay-Sensitive Applications
WIOPT
IEEE
DOI: 10.1109/WIOPT.2009.5291602
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.
