Matches 151 - 190 out of 190 < 1 2 3 4
Match Document Document Title
5533019 Packet data in an analog cellular radiotelephone system  
A method and apparatus for circuit-switched and single-user traffic channel packet data communication in a cellular radiotelephone system, including a base station and mobile data unit both...
5519760 Cellular network-based location system  
In a cellular system configuration, the location of a mobile station is determined from the acquisition of cellular network data pertaining to the mobile station, and the translation of such...
5490088 Method of handling data retrieval requests  
A method of handling data retrieval requests is provided. A data server (108) receives a message, which message at least identifies a particular data set (202). The data server (108) determines...
5465397 Method and apparatus for selecting the best fixed communication unit  
A portable communication unit (120) capable to communicating on a plurality of communication channels. The portable communication unit (120) includes a method for selecting one of an at least two...
5463646 Method for error correction of a transmitted data word  
The process of the present invention error corrects sub-audible data words that have been transmitted over a voice channel. A data word may be transmitted up to three times if an acknowledge is not...
5442553 Wireless motor vehicle diagnostic and software upgrade system  
A transceiver and additional memory are connected to the microprocessor in a vehicle so that all, or selected portions, of operating data is stored in the memory and periodically transmitted to a...
5440542 Method and apparatus for multiplexing control information into a user signal stream of a CDMA cellular system  
A method and apparatus is offered of multiplexing control information into a user signal stream in a cellular communication system using code division multiple access. The method includes the steps...
EP0663785A2 Method of data transfer and a data interface unit.  
This invention relates to a method of data transfer via a radio telephone network between a LAN (1) and a Mobile Station and to a data interface unit that applies the method. According to the...
5432843 Method of performing handoff in a cellular communication system  
The method consists of analyzing a handoff request received from a source base station at a source base site controller (BSC). If the handoff request contains a preferred base site list (is from a...
5396539 Cellular data overlay system for storing data identifying selected data allocated channels  
A cellular telephone system includes a packet-switched digital data communication subsystem overlaying a circuit-switched (e.g., voice) communication subsystem, with voice and data services sharing...
5392331 Method and apparatus for performing a hand-off in a wireless communication system  
A method and apparatus in a digital wireless communication system (100) controls an inter-cell hand-off. First and second fixed units (102) receive a common synchronization signal from a controller...
5377185 Multisite RF system with a centralized telephone interconnect  
A centralized telephone interconnect system for an RF multisite system. Multiple publicly trunked radio sites are networked together through a multisite switch. The centralized telephone...
5357380 Method and apparatus for indicating when each track is in burst in a multitrack tape device  
A method and apparatus which first calculates track to track skew in a tape device and then uses the results of that calculation to adjust the windows for detection of sync and resync characters....
5301356 Prioritization between handoff and new call requests in a cellular communications system  
A method and system for ensuring that handoff requests take priority over new cell requests to engage voice channels assigned to a particular target cell are provided. A certain number of channels...
5287541 Global satellite communication system with geographic protocol conversion  
A satellite communication system (1110) provides geographic protocol conversion for message delivery between communication transceivers (1118, 1118') operating within at least two geographic areas...
5268933 Data packet alignment in a communication system  
A communication system provides data packet timing alignment to facilitate soft handoff. A vocoder (315) transmits compressed voice frames to base-stations (130,131) along links (110,112) of...
5258980 Radio channel switching control method  
A radio channel switching control method for a digital mobile communication system employing TDMA techniques, in which a mobile station stores the synchronized state in the current channel,...
5241548 Method for error correction of a transmitted data word  
The process of the present invention error corrects sub-audible data words that have been transmitted over a voice channel. A data word may be transmitted up to three times if an acknowledge is not...
5226071 Call path resource allocation in a wireless telecommunications system  
A wireless telecommunications system where call path resources are allocated in an orderly manner by queuing call requests during, for example, radio channel unavailability, and assigning radio...
5212823 Radio communication system  
In a radio communication system, a base station transmits a signal including a component which designates a power level. A mobile station receives the signal from the base station. In the mobile...
5206863 Processor-to-processor communications protocol for a public service trunking system  
A downlink between a communications dispatch console and a digitally trunked radio repeater system site controller efficiently transfers message data between the site controller and the console...
5200957 Mobile assisted handoff  
The invention relates to a method for communication and handoff in a cellular mobile radio system and a base station and a mobile station for communication and handoff in such a system, in which...
5168516 Radio telephone having improved modulation characteristics for data transmission  
A radio telephone system of the multi-channel access type using an empty channel selected from a plurality of channels for radio telephone communication of voice audio or data signals and a method...
RE34034 Cellular telephone data communication system and method  
The cellular telephone data communication system and method involves the use of a mobile data processing interface and a cooperating static data processing interface to effectively transmit data...
5140627 Handoff procedure that minimizes disturbances to DTMF signalling in a cellular radio system  
Disturbances to DTMF signaling between mobile stations and the land-based system caused by handoff are minimized. DTMF signals are transmitted in real time between a mobile station and its...
5128930 Processor-to-processor communications protocol for a public service trunking system  
A downlink between a communications dispatch console and a digitally trunked radio repeater system site controller efficiently transfers message data between the site controller and the console...
5047762 Method and apparatus for increasing co-channel utilization in a multi-station data communications network with overlapping coverage  
A digital radio system having improved co-channel utilization is disclosed. A remote terminal receives a station identification from one of the fixed stations having an overlapping radio coverage...
5042082 Mobile assisted handoff  
The invention relates to a method for communication and handoff in a cellular mobile radio system and a base station and a mobile station for communication and handoff in such a system, in which...
5020090 Apparatus for removably connecting a cellular portable telephone to a computer  
Apparatus for removably connecting a cellular portable telephone to a laptop or portable computer is disclosed and comprises a track formed in the housing of the computer and is structured to...
5008953 Mobile station link supervision utilizing digital voice color codes  
A method and apparatus are disclosed for supervising a communication link in a cellular mobile radio system between a base station and a mobile station on a digital voice channel by utilizing...
4998289 Signal integrity control technique for an RF communication system  
An interference detecting circuit is used in a cellular radiotelephone communication system which employs angular modulated frequencies in order to determine when to change the communication...
4984290 Method of controlling communications in a cellular radiotelephone system  
A cellular system employs a subaudible signalling control protocol. The protocol includes transmitting supervisory related signals between the radiotelephone and one of the cell sites at a first...
4941167 Telephone system with customized central message center  
A telephone system employs a novel message system for calling parties. The switch controller includes selectable and programmable announcement machines, while the telephone devices include...
4912756 Method and apparatus for error-free digital data transmission during cellular telephone handoff, etc.  
A system for providing error-free data communication between first and second personal computers over a conventional cellular telephone system includes an interface adapter coupling the first...
4866710 Reuse groups for scan monitoring in digital cellular systems  
An improved TDMA radiotelephone cellular communication system employs an improved cell site scan monitoring technique. The technique includes monitoring radiotelephone calls, and tracking and...
4837800 Cellular data telephone system and cellular data telephone therefor  
A unique cellular data telephone system includes a cellular telephone system (CTS 150), a cellular data switch (CDS 170), and a telephone central office (130) for providing both voice and data...
4835731 Processor-to-processor communications protocol for a public service trunking system  
A downlink between a communications dispatch console and a digitally trunked radio repeater system site controller efficiently transfers message data between the site controller and the console...
4811380 Cellular radiotelephone system with dropped call protection  
An improved cellular telephone communication system is described having operational steps which prevent a call from being dropped due to a radiotelephone not receiving a handoff instruction from...
4803726 Bit synchronization method for a digital radio telephone system  
A method and means for maintaining continuous bit synchronization of data transmitted from a remote unit through a base unit to a landline unit is disclosed. An input data stream at a first bit...
4776034 Radio communication system operable in cooperation with a VOX system  
In a radio communication system, a mobile station (11) includes a detecting circuit (16) for producing a detection signal during presence of an audio signal, a producing circuit (31) for delivering...
Matches 151 - 190 out of 190 < 1 2 3 4