Lmplementation Of User Equipment Function Ln TD-SCDMA

This paper mainly discuss the software design and implementation of SLM protocol module which is used in the user equipment of the 3g mobile t~lecomniunication system TD-SCDMA.The software make the user equipment not only holding the GSM needed fiinctions,but also having the double mode function accoding to the need of TD-SCDMA through which can the user equipment access the multimedia service that TD-SCDMA provide.Accoding to the layer structure of the mobile telecommunicaton system,the software is divided into two module:upper and bottom. The bottom module is to implement the reset of the SIM card and communication with the SIM card. the upper module communication with the module of the upper layer with the mailbox mechanism.to protect the access to the IIC bus of the hardware from the collision,use the semaphore mechanism.