DIIES Department, University Mediterranea of Reggio Calabria, 89100 Reggio Calabria, Italy.
Sensors (Basel). 2018 Jul 9;18(7):2205. doi: 10.3390/s18072205.
The forthcoming fifth generation (5G) networks are claimed to deliver the large amount of traffic generated by the huge number of heterogeneous devices that constitute the Internet of Things (IoT). This unprecedented volume of both human- and machine-generated traffic to be managed imposes 5G network operators to move the focus from throughput-optimized to energy-efficiency-optimized resource allocation solutions. Device-to-device (D2D) communications are recognized as an effective offloading technique that the 5G network can exploit to boost the capacity and energy efficiency of future 5G networks. In this paper, we design a technique to efficiently deliver multicast traffic in a 5G New Radio (NR) network by exploiting the benefits of D2D communication and single-frequency operation in order to improve the overall network energy efficiency. In the designed solution, the subset of devices in better channel conditions are served through a conventional multicast transmission, while cell-edge devices receive the multicast service from relay nodes that simultaneously transmit in D2D mode the same content. The dimension of the multicast serving area and the set of D2D connections to establish are chosen in order to maximize the overall network energy efficiency. Performed simulation results show the effectiveness of the proposed solution under varying frame configurations and number of multicast devices.
即将到来的第五代（5G）网络据称将传输由构成物联网（IoT）的大量异构设备生成的大量流量。这种前所未有的人类和机器生成的流量都需要 5G 网络运营商将重点从吞吐量优化转移到能效优化的资源分配解决方案。设备到设备（D2D）通信被认为是一种有效的卸载技术，5G 网络可以利用它来提高未来 5G 网络的容量和能效。在本文中，我们设计了一种技术，通过利用 D2D 通信和单频操作的优势，在 5G 新无线电（NR）网络中高效地传输组播流量，以提高整体网络的能效。在设计的解决方案中，信道条件较好的设备子集通过传统的组播传输进行服务，而小区边缘设备则从同时以 D2D 模式传输相同内容的中继节点接收组播服务。组播服务区域的维度和要建立的 D2D 连接集是根据最大化整体网络能效来选择的。所提出的解决方案在不同的帧配置和组播设备数量下的有效性进行了仿真验证。
