Chiti Francesco, Fantacci Romano, Picano Benedetta, Pierucci Laura
Department of Information Engineering, Università di Firenze, Via di Santa Marta 3, 50139 Firenze, Italy.
Sensors (Basel). 2020 Sep 18;20(18):5347. doi: 10.3390/s20185347.
The upcoming fifth generation (5G) wireless networks making use of higher-frequency spectrum bands suffer from serious propagation issues due to high path loss and beam directivity requirements. This promotes the device-to-device communications to boost the transmission reliability at the network edges, providing remarkable benefits in terms of the energy and spectrum efficiency, essential for a wide class of sensors networks and Internet-of-Things. More in general, applications where devices are usually constrained in computational and transmission range capabilities. In such a context, the selection of the proper number of devices arranged as a relay plays a crucial role. Towards this goal, this paper proposes an efficient relay selection scheme minimizing both the delivery transmission delay and the overall energy consumption, i.e., the overall number of relays to be used. By focusing on a multicast content delivery application scenario the problem of interest is formulated as a one-sided preferences matching game. In addition, the strategy designed takes into account specific information, named reputation coefficient, associated to each device jointly with link propagation conditions for allowing the selection of suitable relays for disseminating the content among the devices. The effectiveness of the proposed solution is underpinned by computer simulations, and the performance is evaluated in terms of power consumption, end-to-end delay, and number of selected relays. As confirmed by results, the proposed approach improves network performance compared to the greedy approach, the random algorithm, a scheme previously proposed in literature, and with two game theory-based strategies.
即将到来的利用更高频段频谱的第五代（5G）无线网络，由于高路径损耗和波束方向性要求，面临严重的传播问题。这促使设备到设备通信提升网络边缘的传输可靠性，在能量和频谱效率方面带来显著益处，这对于众多传感器网络和物联网至关重要。更一般地说，在设备通常受计算和传输范围能力限制的应用中也是如此。在这种背景下，选择合适数量的作为中继的设备起着关键作用。为实现这一目标，本文提出一种高效的中继选择方案，可同时最小化传输延迟和总能耗，即所使用中继的总数。通过聚焦多播内容传输应用场景，将感兴趣的问题表述为单边偏好匹配博弈。此外，所设计的策略考虑了与每个设备相关的特定信息，即声誉系数，以及链路传播条件，以便选择合适的中继在设备间传播内容。所提解决方案的有效性通过计算机模拟得到支持，并从功耗、端到端延迟和所选中继数量方面评估性能。结果证实，与贪婪方法、随机算法、文献中先前提出的一种方案以及两种基于博弈论的策略相比，所提方法提高了网络性能。
