Aiming at architecture of UMTS R4 core network of TD-SCDMA
some technical issues and solutions on engineering implementation of MRBT service are discussed.Adopting protocol of BICC as primary access method and using IP bearing measure up the IP trends on core network.The protocol of ISUP(ISDN User Part) is added as secondary signal routing in order to enhance reliability of the service system.Since MRBT service would transfer from bridging mode to non-bridging mode in the future
two modes should be considered as a whole on deployment of this service
which is of benefit to transferring smoothly.Leveraging by reasonable policy of networking
preview function of video ring tones in the environment of WAP is implemented based on streaming technology.