Resource Allocation Of D2D Communication

As a key component of the next-generation wireless cellular system,D2D (Device-to-Device) underlay communication has received great attention for offloading trafficburden of BS (Base Station), improving spectral efficiency, and providing better user experience. Different from the traditional network in which services are provided to user equipments through the BS, the user equipments in D2D mode can communicate directly with each other over the short distance direct communication links. Although D2D communication may enhance the spectral efficiency and increase the systemcapacity, it also causes interference to cellular network as well receives interference from cellular user. Proper resource allocation scheme can help reduce the aforementioned interference,improve spectral efficiency and system throughput. Thus, in this paper,we mainly study the resource allocation of D2D communication.Main contributions and results are as follows:Firstly, in the D2D underlay commnunication scenario in sigle cell,we propose a Kuhn-Munkres algorithm based iteratives cheme that can allocate resource and manage power control with low computational complexity. The proposed scheme allows that mutiple D2D links simultaneously reuse same resource of one cellular user while a D2D link reuses multiple resource blocks of different cellular users. This scheme can improve the system performance efficiently.Secondly, we study the resource scheduling for content downloading network with D2D support. In the content downloading network senario,we propose a low complexity two step scheme for resource allocation.The proposed scheme matches content helper for content downloader,and matches cellular user who offers resource for that D2D link. The proposed scheme can efficiently decrease downloading time, improve users' experience and show advantage when contents reuse rate is high.Thirdly, we studied resource scheduling for V2X (Vehicle to Vehicle,Person, Infrastructure) network with D2D suport. According to the characteristics of V2X network, we propose a distributed, flexible network resource allocation and power control scheme. The proposed scheme can efficiently allocate communication resource, manage power control, greatly improve the spectrum efficiency, enhance communication capacity of the system, reduce mutual interference between users who share the same resource, and avoid causing too much burden to the base station, releasing base station from excessive computing and decision behavior.