초록 ▼

A communications system for carrying messages via a radio channel between one central site of a plurality of central sites and a plurality of two-way remote data units is disclosed. Each central site has a radio coverage area and each remote unit has a unique address and association with one of the

A communications system for carrying messages via a radio channel between one central site of a plurality of central sites and a plurality of two-way remote data units is disclosed. Each central site has a radio coverage area and each remote unit has a unique address and association with one of the central sites. When a message addressed to one of the remote units is received in a central site, a file of remote unit addresses is searched to find the location and central site association of the remote unit to which the message is addressed. If an address match is found indicating that the remote transceiver is in the coverage area of the message-receiving central site, the addressed message is stored and transmitted in that site. If an address match is found indicating that the remote transceiver is in another central site, the addressed message is conveyed to that site for transmission.

대표청구항 ▼

A communications system for carrying messages via a radio channel between one central site of a plurality of central sites, each central site having at least one essentially distinct radio coverage area, and a plurality of two-way remote units, each remote unit having a unique address and an associa

A communications system for carrying messages via a radio channel between one central site of a plurality of central sites, each central site having at least one essentially distinct radio coverage area, and a plurality of two-way remote units, each remote unit having a unique address and an association with one of the central sites, comprising: means for accepting messages in a first central site, each of said messages having an address identifying at least one remote unit; means for maintaining a file of remote unit addresses, their central site associations, and location information for those remote units associated with said first central site but located in a second central site; means for storing an accepted message and address at said first central site for later communication to an addressed selected remote unit if said selected remote unit is associated with said first central site; means for routing any of said accepted messages and addresses from said first central site to said second central site when an addressed remote unit is determined to be in said second central site location; means for selecting the radio coverage area of said first central site which is most likely to contain said addressed remote unit and for transmitting said stored message to said addressed remote unit; means for receiving and storing said transmitted message at said addressed remote unit and for transmitting a message received acknowledgement signal in response thereto; means for deleting said stored message and address at said first central site upon receipt of said acknowledgement signal; and means at each remote unit associated with said first central site for transmitting its unique address to said second central site when located in the radio coverage area of said second central site thereby logging in to said second central site and causing location information to be added to said maintained file.