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Cooperative Cognitive Transmission Scheme Based on Adaptive Multi-dimensional Resource Allocation |
LI Zhao LI Yiwen |
(State Key Laboratory of Integrated Service Networks, Xidian University, Xi’an 710071, China) |
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Abstract A transmission mechanism based on the joint management of time, frequency and space domain resources is proposed in the Cooperative Cognitive Radio Network (CCRN), with which the cooperative cognitive users can obtain proper reward under the premise of improving the primary user’s transmission. The proposed scheme employs multi-antenna cognitive user as a relay. Via adaptive time-slot and bandwidth allocation, bottleneck in the two-hop transmission can be eliminated. Furthermore, a relay selection algorithm taking fairness into account is given for the situation where multiple cooperative cognitive users exist. On one hand, the relay selection utilizes proportional fair to achieve inter-cognitive-user fairness. On the other hand, proper reward is determined by adjusting the incentive factor. Simulation results show that the proposed mechanism can improve the data rate of both primary and cognitive systems, and afford fair reward to the cognitive relays.
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Received: 17 November 2015
Published: 19 July 2016
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Fund: The National Natural Science Foundation of China (61401354, 61401320, 61501285, 61102057), The 111 Project (B08038) |
Corresponding Authors:
LI Zhao
E-mail: zli@xidian.edu.cn
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