中文摘要：

无线多媒体业务的爆炸式增长使得D2D（Device-to-Device）通信技术成为下一代移动通信系统的研究热点。用户发现策略,作为D2D关键技术之一,旨在有效发现潜在的D2D邻居用户。基于现有用户发现策略建立D2D链路,正面临着有效性和安全性的巨大挑战。本文考虑到每个用户不可避免地处于移动社交网络中,提出了基于社交关系的按需用户发现策略。主要根据用户请求的文件、具有的社交关系以及基站反馈和更新系统用户的状态信息表,来发现潜在的D2D用户对并建立D2D链路。理论分析及仿真结果表明,该策略可以更有效地发现邻居用户,并提高了D2D链路建立的安全性。

英文摘要：

As the explosion of wireless multimedia services,device-to-device（ D2D） communication technology has naturally become a new focus of the research in the next generation mobile communications. As a main component among the key technologies,the security and effectiveness of establishing D2 D links which are depending on peer discovery aiming to probe the D2 D communication contacts is critically challenging. So,we proposed the user-demand peer discovery strategy based on social relationships,which was according to the documents requested by users,social relationships and the status information feed-backing or updating by base stations to identify potential D2 D users to establish D2 D links. Theoretical analysis and simulation results show that,the proposed strategy can effectively discover neighboring users,and at the same time,the security of constituting D2 D link between users has also been increased.