一种基于CPRI的分布式基站拓扑链路建立方法

An Approach to Setting up Links for Distributed Base Station Based on CPRI Specification

分布式基站将基带模块和射频模块分离,CPRI协议为二者通信提供了一个接口规范。基带模块和拉远射频模块之间链路的建立和维护直接影响无线数字移动通信的质量和容量。基于CPRI协议提出了一个链环拓扑链路的建立方法。该方法利用光口的周期扫描以及主-主端口冲突特性获得链路的跳数来建立拓扑链路,并在基带模块的主控单元里保存到每一个拉远射频单元的路由表。该方法在链路中断时能及时地切换链路保证正常的通信,提高了链路的可靠性。

The CPRI specification providea a standard transmission interface between RF module and base- band module separated in the application of distributed base station. The quality and capacity of the wireless communication depends on the links between RF module and base - band module. Put forward an approach to setting up links based on CPRI specification. By means of periodic port scan and the character of master-master port collision,the number of the hop can be obtained to set up links. In the main processing part of the base -band module there preserves the routing table reaching to every RF module. It is able to switch to other links while the connection breaks up,which improves the reliability of the links.