高铁隧道内LTE FDD系统上下行受限问题研究

Research on Up Link and Down Link Restricted Problems of LTE FDD System in High-speed Railway Tunnel

在高铁隧道内LTE FDD系统设计过程中有的设计认为LTE FDD为下行受限系统,有的设计认为LTEFDD为上行受限系统,为理清LTE FDD系统的上下行受限问题,有必要对LTE FDD系统上下行链路平衡进行详细研究,得出有说服力的结论,为今后一段时间内的LTE FDD系统以及LTE-R系统的工程建设提供指导.本文从LTE FDD系统底层结构出发,结合设计规范、产品标准的相关指标以及无线通信传播理论,对LTE FDD系统的上下行链路平衡进行详细推导,从而得出LTE FDD为上行受限系统的结论,供设计人员参考.

In the LTE FDD system design process, some engineers consider LTE FDD as a down link restricted system, and some engineers consider LTE FDD as an up link restricted system, so it is necessary to do a detailed research on the up link and down link balance of the LTE FDD system to provide guidance for the construction of LTE FDD system and LTE-R system. In this paper, the author deduced the up link and down link balance of LTE FDD system in detail from the underlying structure of LTE FDD system in combination with design code, relevant indicators of product standards and wireless communication propagation theory. The derivation process and conclusion can be used for reference by the majority of engineering designers.