2D邻居发现中基于时延性能的资源自适应分配方案

2D communication, which promises direct communication between devices without relaying via base stations, turns out to be a key technology for LTE-A, due to its potential in improving the spectrum efficiency and reducing energy consumption. D2D discovering is a key step in D2D communication. Resource allocation plays an essential role in D2D discovery procedure, since it directly affects system performance such as discovery range, energy consumption, discovery ratio and delay. To solve the problem that current resource allocation shcemes has a poor adaptation capability to different dense of user deployment,we propose two resource allocation schemes. Delay-based sub-frame adaption scheme and delay-based joint sub-frame and discovery period adaption scheme can provision the delay-sensitive service or serve as an universal adaption strategy to some extent. It should be emphasized that the joint sub-frame and discovery period adaption scheme can maximize the resource utilization while guaranteeing delay performance. Both numerical analysis and simulation results highlight the correctness and efficiency of the proposed schemes.