Research On Matching Policy In D2D Video Data Distribution Systems

With the explosive growth of the wireless video traffic,D2D communication technology is applied to video distribution design in order to meet the growing demand.The most important step of D2D video distribution system is to select the appropriate D2D transmitter and D2D receiver to form D2D pairs for video data transmission,and the process is called matching strategy in this thesis.Optimizing the matching strategy of D2D video distribution system is of great significance to improve system performance and improve users' experience.The main research contents in this thesis state as follows:For the matching D2D pairs can not allocate the appropriate spectrum resources,resulting in D2D pairs can not access the network,or have a greater interference on cellular users,then the joint resource allocation match algorithm is proposed,which guarantees the quality of service requirements of cellular users and D2D users.In this paper,the optimization objective function is transformed into the three-dimensional matching problem of D2D requester,D2D helper and cellular user spectrum resource.In order to reduce the complexity of three-dimensional matching problem,the problem is transformed into a two-dimensional matching problem between D2D requesters and HC(the combination of D2D helper and cellular user spectrum resource).The two-dimensional matching problem is divided into three parts.The access control criterion of D2D users is proposed according to the quality of service requirements of users and the maximum power limit;The power allocation of D2D users and cellular users is calculated according to the convex optimization theory;Finding the appropriate HC for the D2D requester using the bilateral matching theory.The diversified trend of mobile users require provide different coding rate data for different users,we can make full use of resources through implements D2D communications among different channels.The proposed matching algorithm based on coding rate conversion can properly arrange the matching between the D2D transmitter and the D2D receiver of different channels,and the corresponding coding rate vedio date can be obtained by D2D users of the different channels in the system.The above research contents are the necessary conditions for D2D communication technology to be applied to the video distribution service,which can provide reference for the deployment and implementation of D2D video distribution system.