دانلود رایگان مقاله طرح مدیریت منابع رادیویی و تحلیل زمان قطع برق برای ارتباطات D2D چند هاپ

Abstract

In a cellular network it's very difficult to make spectrum resource more efficiently. Device-to-Device (D2D) technology enables new service opportunities, and provides high throughput and reliable communication while reducing the base station load. For better total performance, short-range D2D links and cellular links share the same radio resource and the management of interference becomes a crucial task. Here we argue that single-hop D2D technology can be used to further improve cellular networks performance if the key D2D radio resource management algorithms are suitably extended to support multi-hop D2D communications. Aiming to establish a new paradigm for the analysis and design of multi-hop D2D communications, We propose a radio resource allocation for multi-hop D2D routes based on interference avoidance approach in LTE-A networks. On top of that, we investigate the outage probability of D2D communication. We first introduce a new definition of outage probability by considering the maximum distance to be allowable for single-hop transmission. Then we study and analyze the outage performance of a multi-hop D2D route. We derive the general closed form expression of outage probability of the multi-hop D2D routes. The results demonstrate that the D2D radio, sharing the same resources as the cellular network, provide higher capacity compared to pure cellular communication where all the data is transmitted through the base station. They also demonstrate that the new method of calculation of D2D multi hop outage probability has better performance than classical method defined in the literature.

6. Conclusion

In this paper We have analyzed multi hop D2D communications underlying a cellular network. We have shown that given coordination mechanisms and proper power control it is possible to have D2D connections that reuse cellular band and still cause only minimal interference to the cellular communication. We considered several allocation strategies, including traditional cellular communications. The results have shown that significant gains in total throughput can be achieved by enabling single hop D2D or multi- hop D2Dcommunications compared to the conventional cellular system. Further, we have performed analytical studies to analyze how much gain can be expected in terms of outage probability for the multi- hop D2D communication. The simulation results have shown the impact of the rmax we note that a change in value in the down level has a greater impact on the outage probability of the system performance. Equally, because D2D mode has been ideal for shorter distances, the normally harmful affects of pathloss actually help manage the interference at the eNB. When pathloss exponent is larger, D2Ds become more isolated from the base station making shorter distance hops more efficient. In addition, we can observe that the probability of outage depends on the number of hops in the D2D multi-hop route.