基于LTE－A系统邻近业务（ProSe）直接通信的设计与实现

摘要

3GPP在LTE－A系统中引入了邻近业务（proximity－based services， ProSe）来提高频谱利用率和降低基站负荷。终端通过基站分配的频谱资源进行直接通信，从而提高无线频谱资源的利用率，而UE间邻近业务成功建立后，基站的负荷得以降低。提供了邻近业务直接通信场景，提出了2种邻近业务直接发现方式，并基于第二种发现方式设计了直接通信建立的流程，搭建了基于TTCN－3（Testing and Test Control Notation version 3，测试与测试控制描述第三版）测试系统的多终端一致性测试平台，而后将设计流程抽象化，在搭建的平台上进行一致性测试，最终验证了邻近业务（ ProSe ）直接通信的流程设计与协议的一致性，为该业务的开发奠定了基础。%In order to improve the utilization of the spectrum resource and reduce the load of base stations , the 3GPP are introduced proximity-based services (ProSe) in the LTE-A system.Terminals find terminals in proximity and communicate directly on the resources allocated by the base station .The load of base station were reduced when direct communication is totally set up .In this paper , firstly direct communication scenarios of proximity-based services are provided , then two methods of direct discovery are proposed and a test process based on the second method is designed , lastly a platform of protocol conformance testing to test multiple terminals is built .Then the test process is abstracted and done protocol conformance testing automatically on the platform using TTCN -3 core language.Finally, the test passes and the process design of proximity-based services (ProSe) is totally in accord-ance with the 3 GPP protocol specification , which lays a foundation for the development of proximity-based services ( ProSe).