Energy saving and channel access algorithm of unlicensed D2D networks in power Internet of things
Chen SUN1(),Zhe-yi WU2(),Jian-tao YUAN2
1. Zhejiang Huayun Information Technology Limited Company, Hangzhou 310052, China 2. School of Information and Electronic Engineering, Zhejiang University, Hangzhou 310058, China
Joint spectrum and power allocation was analyzed to find the allocation which minimizes the power consumption by considering the power consumption of terminals in unlicensed device-to-device (D2D) communication. A channel access protocol on unlicensed channels was proposed, which determines the unlicensed channels used by the D2D pairs and the time fraction used on the unlicensed channels with the assistance of the licensed channels. Then an optimization problem was raised, whose objective was to minimize the total transmission power of the system. The data rates of D2D pairs and interference to base station (BS) were considered. The optimization problem can be transformed to a convex one and solved by the interior point method. The effectiveness of unlicensed D2D (D2D-U) networks was verified by numerical simulation results. The optimal allocation can be obtained by the proposed algorithm.
Chen SUN,Zhe-yi WU,Jian-tao YUAN. Energy saving and channel access algorithm of unlicensed D2D networks in power Internet of things. Journal of ZheJiang University (Engineering Science), 2020, 54(10): 1867-1873.
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