Research And Implementation Of The WCDMA Air Interface RLC Layer Protocol

WCDMA is one of the main techniques in the 3rd generation mobile communication system. Researchers, manufacturers and users over the world are paying more and more attentions to its development. Based on the "863" project of China 3rd generation mobile communication system , This paper is a part of system control software in 863 project-"develop and ASIC design of WCDMA MT experiment subsystem". Based on 3GPP standard, the author analyzed and researched the higher protocol layers of radio interface in WCDMA, including radio resource control layer (RRC), medium access control layer (MAC) and radio link control layer (RLC), in which, the RLC is emphasis.Based on 3GPP release'99 standard, the system control soft of the project is written for the three protocol layers mentioned above. The implement tools are the real time multi-tasking operating system, pSOS, and specification description language, SDL.The emphasis of this paper is the realization of the services in the RLC layer using the multi-tasking operation system, including software structured design of RLC layer, three kinds of data transfer module (TR, UM, AM) and the definition of relevant data structure. In which, final system tests of TR and UM module has been passed. According to the requirement of the project, the author simplifies the generation of the status report and gives a complete design scheme. Using the SDL design language, the scheme is simulated and the result can meet the requirement of the high reliability for the data transfer in a mobile communication environment.