Method and apparatus for adapting non-cellular private radio systems to be compatible with cellular mobile phones

摘要

The air interface of a private radio system is adapted to be compatible with the air interface of a cellular mobile network. The private radio system's beacon channel includes a dual-burst type of frequency correction channel and synchronization channel. The burst formats of these two channels are defined according to the frequency correction channel and synchronization channel burst formats used in the cellular mobile network. An information message carried in the private synchronization channel includes status and identity information related to the private radio system. An access request channel is defined for the private radio system, which enables a mobile terminal to request access to the private radio system. The protocol of the private radio system's access request channel (in the uplink) is similar to the protocol of the cellular network's access grant channel used in the downlink. Alternatively, the protocol of the cellular network's synchronization channel in the downlink can be used for the private radio system's access request channel (in the uplink). Consequently, the mobile terminal can be used as a private cordless phone.