Abstract
Device-to-Device (D2D) communications have recently attracted researchers, attention because of their numerous applications in industry verticals. It enables communications among devices without or with the partial involvement of a central system. To initiate a D2D communications device discovery and radio resource allocation is a critical task when devices have high mobility. Maintaining the quality-of-service and continuous connectivity requires a signaling burden. An efficient mobility management procedure is necessary to discover the neighboring devices in D2D communications systems. The Discovery of a massive number of devices requires an effective radio resource management procedure that causes signaling overhead. In 5G and beyond communication system, two mobility management methods exist; device discovery and beaconing. Since device density and traffic increases exponentially with high mobility, hence device discovery and beaconing increase the signaling overhead and energy consumption in power-limited devices. Thus, signaling overhead research needs much attention in 5G and beyond systems to meet the service requirements like accuracy, latency, and battery life. Therefore, the challenges and the techniques related to signaling overhead in D2D communications are presented.
Highlights
Device-to-Device (D2D) communications are becoming a prominent choice for telecom operators with the speedy growth of wireless devices and personal communication technology
The base station decides the number of resources required for the transmission, and the scheduling algorithm figures out the number of resource blocks that must be allocated, a scheduling quota is assigned to the device
Signaling overhead reduction parameters are elaborated by group-based device discovery and frequency correlation
Summary
Device-to-Device (D2D) communications are becoming a prominent choice for telecom operators with the speedy growth of wireless devices and personal communication technology. In this article, centralized control of in-band D2D communications includes a potentially massive amount of signaling overhead in terms of device discovery signaling, resource allocation, etc., which are the key challenges. Device discovery is the initial step to initiate the D2D communications, which has signaling overhead that includes discovery area update, discovery area list allocation, and the number of cells in the discovery area. The existence of signaling overhead causes inefficiency, delay, and ineffective mobility management of the devices in D2D communications. We analytically examine signaling overhead issues in a D2D communication system and assess them with a viewpoint of the next-generation networks It proves that as compared with the existing LTE system, D2D has a long device battery time. We presented the consequences of the existing signaling overhead procedures and summarized the challenges for both the device and network performance.
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