a paging network having a master transmitter and several local radio transmitters is disclosed . the network is designed to allow the transmission of local and global messages . global messages must be sent by all radio transmitters synchronously . local messages are only sent by a single radio transmitter . the master transmitter generates a signal that contains the global messages and sends it to the radio transmitters . if a radio transmitter has no local messages to be sent , it emits the unchanged signal received from the master transmitter . if a radio transmitter has one or more local messages to be added to the signal , it will determine if there are suitable gaps in the signal received from the master transmitter where the local messages can be included . if such gaps are found , the local messages are added to the signal to generate a modified signal which is then emitted by the radio transmitter . in order to allow a forward recognition of gaps in the signal sent by the master transmitter , special gap markers or allocation messages can be added . the proposed method makes it easy to exploit the capacity of the available radio channel .