Device-to-Device Communications in Unlicensed Spectrum: Mode Selection and Resource Allocation
Device-to-Device Communications in Unlicensed Spectrum: Mode Selection and Resource Allocation
复制标题
免许可频谱中的设备到设备通信：模式选择和资源分配
DOI：
10.1109/access.2016.2603237
复制
发表时间：
2016-01-01
期刊：
影响因子：
3.9
通讯作者：
Zhang, Zihan
中科院分区：
文献类型：
--
作者：
Liu, Rui;Yu, Guanding;Zhang, Zihan
In this paper, a novel technology, namely, device-to-device communications in the unlicensed spectrum (D2D-U) is proposed, which can allow D2D users to transmit on the unlicensed spectrum and coexist with the incumbent Wi-Fi networks. In D2D-U networks, D2D users can share the licensed spectrum with the existing cellular users or share the unlicensed spectrum with legacy Wi-Fi networks. Therefore, mutual interference across different networks and different users should be properly coordinated to optimize the system performance. In this paper, within the framework of D2D-U, we propose a joint mode selection and resource allocation algorithm to minimize the overall interference that cellular and Wi-Fi users suffer from the D2D communications while guaranteeing the signal-to-noise-and-interference ratio requirements of all users, including those of cellular, D2D, and Wi-Fi. Through theoretical analysis and numerical simulation, we show that using unlicensed spectrum can significantly mitigate the interference to both cellular and Wi-Fi users. Moreover, the duty cycle-based unlicensed spectrum access method achieves better system throughput than the listen-before-talk-based access method in most of the cases.
