Research And Implementation Of CPRI Controller In Radio Unit

With the wide spread deployment of remote base stations, the CPRI protocol for the communication between the remote base station and the radio unit is used by the major of equipment manufacturers. CPRI protocol improves the flexibility and efficiency of the base station production, and thus the REC and RE can be designed and upgraded independently. On this thesis,the design and implementation of the radio unit link monitoring and management software are accomplished based on the CPRI protocol, and one method based on bucket algorithm is proposedto handle bit error alarms.Firstly, the CPRI protocol and the distributed real-time operating system OSE are introduced, and the link handler mechanism which the protocol’s state machineand RBS software systemdependent on is studied. Then the software requirements analysis and detailed design are introduced. Software mainly contains four functional modules:link establishment and monitoring module in slave mode, link establishment module in master mode, delay processing module, error handling module and two external interfaces:RICRAI interface and RICI interface for upper application software.Then the details of the implementation of the software are given, including the structure of code and processes, the implementation of I2C interface used to communicate with SFP module, and the leak bucket detection algorithm of the bit error.Finally, the test scheme and result of the software module are introduced.The software was evaluated through static code test, function test and robustness test.The results show that the software module meet the requirements of monitoring and controlling the link, and the performance is good.