Resource Scheduling for LTE in Unlicensed Bands with Delay Priority.

Nowadays, the shortage of the licensed spectrum and the rapid development of mobile communication technologies have brought new challenges on the spectrum utilization. LTE in the unlicensed band, namely LTE-U, under the carrier aggregation technology has been widely concerned. In the multiple LTE-U base station scenario, the main problem is to design a proper access mechanism in the unlicensed band to avoid mutual interference. Meanwhile, LTE-U can not continuously transmit in the unlicensed band, which would affect the transmission performance of delay-sensitive users. In this paper, we proposes a delay-based priority resource scheduling scheme for multiple LTE-Us that could ensure the fairness resource allocation among LTE-U, the transmission performance of WiFi, as well as the transmission quality of delay-sensitive LTE-U users. The optimization problem is solved by two steps: delay-based priority resource scheduling and price-based resource allocation scheme. Simulation results demonstrate the effectiveness of the proposed algorithm.