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| Number | Title | Issue Date |
| 5377267 | Method of authentication with improved security for secrecy of authentication key A method of subscriber authentication suitable for a roaming service in a telecommunication capable of realizing an improved security for the secrecy of the authentication key. In this method, an authentication data Indicative of a tentative authenticatio... | 12/27/1994 |
| 5375254 | Method of operating a communications system, a communications system and a secondary station for use in the system A communications system, such as the DECT, comprises a plurality of geographically separate primary stations and a plurality of secondary stations which are able to roam relative to the primary stations. Communication between a primary and a secondary sta... | 12/20/1994 |
| 5369684 | Apparatus and method for directing calls to mobile station subscribers The present invention provides a mobile communications system in which the home exchange of a mobile subscriber maintains information indicative of where the mobile subscriber might be found, Upon receipt of a call, the home exchange requests the exchange... | 11/29/1994 |
| 5353340 | Dynamic allocation of roamer routing numbers system and method The present invention provides a communications system including at least one mobile transceiver; at least one mobile switching center, at least one mobile switching center including means for allocating a temporary routing number for at least one mobile ... | 10/04/1994 |
| 5335262 | Radio communication adapter connected to mobile station and mobile communication system using the radio communication adapter A radio communication adapter is used in a mobile communication system including a first mobile communication network, first mobile stations registered in the first mobile communication network, a second mobile communication network connected to the first... | 08/02/1994 |
| 5325362 | Scalable and efficient intra-domain tunneling mobile-IP scheme The present invention provides an improved method and apparatus for internetwork communication between fixed host and mobile host data processing devices. A home network includes at least one mobility support border router (MSBR) coupled between the home ... | 06/28/1994 |
| 5303286 | Wireless telephone/satellite roaming system A wireless telephone system capable of servicing a roaming wireless telephone user includes a satellite communications system consisting of one or more orbiting satellites, each carrying a database of users, destination codes and call codes, within a sate... | 04/12/1994 |
| 5255307 | Status indicator control for cellular mobile telephone system In a cellular mobile telephone system wherein a mobile station is provided with a status indicator which provides a HOME indication when the mobile station communicates with a base station in its home system and a ROAM indication when the mobile station c... | 10/19/1993 |
| 5159625 | Method of selecting the cellular system with which a cellular mobile radiotelephone communicates A remotely programmable cellular mobile radiotelephone (CMR 12) is configured to select (1300) a cellular system (14-16) with which to communicate while roaming. The CMR (12) utilizes a default system selection process. The system selected using this defa... | 10/27/1992 |
| 5153902 | Multi-exchange paging system for locating a mobile telephone in a wide area telephone network A mobile communications system in which a mobile subscriber may roam includes a number of exchanges having coverage areas in which the mobile subscriber may roam. An interrogation exchange receives incoming calls to the mobile subscriber and requests info... | 10/06/1992 |
| 5150362 | Beacon carrier In a cellular mobile radio system a method of choosing at a mobile station an appropriate base station and time slot on a time division multiplexed radio channel for the purpose of call set up or handover, wherein each base station transmits in one time s... | 09/22/1992 |
| 5123111 | Cellular radiotelephone system, a method of protecting the data base of a visitor location register against saturation In a cellular radiotelephone system, the data base of a visitor location register is protected from saturation by releasing n-tuplets from the data base corresponding to those temporary mobile identity words corresponding to mobiles which announced their ... | 06/16/1992 |
| 5095529 | Intersystem group call communication system and method Communication systems having dedicated communication resources are provided with receivers that monitor the communication resources of other communication systems, and roamers are preregistered in non-home systems. Using this infrastructure, a group call ... | 03/10/1992 |
| 5093926 | Trunked communication system scanning method and apparatus A communication unit having a dynamic control resource scan list utilizes the scan list to more effectively roam from the current trunked communication system to other trunked communication systems. The scan list contains control resource information of t... | 03/03/1992 |
| 5090050 | Method and apparatus for communicating with radio telephones A radio telephone communication system is provided for communicating with radio telephones associated with a radio telephone system when the radio telephones are operating in a remote geographical area served by another radio telephone system. The radio t... | 02/18/1992 |
| 4980907 | Telecommunication combination comprising a telepoint and a portable radio terminal The invention relates to a combination of a switched telecommunication network, a telepoint connected to the network and a portable radio terminal constituting part of a residential equipment or an extension to a PABX, the portable radio terminal when ser... | 12/25/1990 |
| 4972460 | Automatic equivalent temporary talkgroup assignment in a roaming trunking environment A trunked communication system utilizes talkgroup synchronization for roaming communication units. By automatically matching the communication unit's talkgroup in a first area-wide system with an talkgroup in a second area-wide system, the communication s... | 11/20/1990 |
| 4916728 | Cellular telephone unit with prioritized frequency acquisition A cellular telephone unit includes selective carrier signal acquisition. Priority of acquisition is given to carrier signals associated with home system identification codes (SIDs), then to any carrier signal associated with a non-excluded SID. Any attemp... | 04/10/1990 |
| 4879740 | Wide area cordless telephone system having means for avoiding double registrations A wide area cordless telephone system covers a service area which is divided into a plurality of local areas to each of which belong a plurality of home position cordless telephones having multi-channel access capability. A plurality of access units are p... | 11/07/1989 |
| 4833701 | Trunked communication system with nationwide roaming capability Selected regional trunking systems are equipped with telephone interconnect capability and provided with local computers (106), which communicate with a national hub computer (110). At each selected trunking system, several IDs are reserved as "roaming ID... | 05/23/1989 |
| 4829554 | Cellular mobile telephone system and method A cellular mobile telephone system and method in which channel assignment and telephone call routing are controlled by a central control station and in which each communications channel is separately controlled at a cell station by a radio interface modul... | 05/09/1989 |
| 4670905 | Method and apparatus for coordinating independent communications systems A method and apparatus for coordinating the transfer of communications control from one independent radio communications system to another is disclosed. A remote unit which communicates data messages is associated with a home system which has a plurality ... | 06/02/1987 |
| 4644351 | Two way personal message system with extended coverage 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 un... | 02/17/1987 |
| 4233473 | Comprehensive automatic mobile radio telephone system In a multi-channel mobile radio telephone system with multiple base stations covering different geographical areas, mobiles may move freely from area to area and automatically originate and receive calls to and from a landswitched telephone network by dir... | 11/11/1980 |
