| With the acceleration of informatization,users' demand for mobile communication is growing.It brings a huge challenge to the wireless mobile broadband systems in terms of frequency,technology and operation.5G(Fifth generation)is not only an air interface technology with higher speed,greater bandwidth,stronger ability,but also a intelligent network oriented for business applications and users' experience.Recently,D2D(Device-to-Device)communication has been widely concerned due to the growth of the local business.D2D communication allows the direct communication between the two devices,without the base station.It can significantly increase the network capacity and improve the utilization of resources.However,due to the immaturity of the technology,D2D communications are facing with many challenges.First,this paper will introduce the development history of D2D communication technology and its performance characteristics.We will analyze the key technology of D2D communication,such as the synchronization technology,and the wireless resource management technology.Then,this paper analyzes the D2D scheduling algorithm based on millimeter wave,and designs a concurrent scheduling algorithm for multimedia broadcasting.The algorithm combines the multi-hop path selection algorithm and the concurrent scheduling algorithm.It makes full use of the spatial reuse.System simulation proves that the performance of the proposed algorithm is improved in terms of delay and system capacity.What's more,D2D communications can be integrated with a variety of technologies,deriving more different applications to enhance the users'experience.This paper proposes an uplink transmission scheme based on D2D coordination in LTE system.Users use D2D communication to monitor each other,and then independently finish the configuration of uplink transmission resources.The scheme is able to avoid the collision caused by the competition.It is proved that this scheme can improve the resource utilization and reduce delay. |
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