Cellular voice and data radiotelephone system
First Claim
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1. A radiotelephone data message transmission system for communicating data message via radio channels between remote subscriber stations and fixed site stations comprising:
- means for accepting a data message in a first format and for converting said first format to a second format;
means for transmitting said data message in said second format on a first radio channel;
means for receiving and reconverting said second format data message to said first format data message;
means for generating a command to cease transmission of said data message;
means for ceasing transmission of said data message upon receiving a command so instructing; and
means for changing transmission from said first radio channel to a second radio channel and for commencing and transmitting said data message in said second format on said second radio channel thereby realizing a handoff.
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Abstract
A data message transmission system for a cellular radiotelephone system is disclosed. Data to be transmitted is converted into a format compatible with radio transmission prior to transmission. The data is reconverted to its original format following reception. Handoff is accomplished by halting the data transmission prior to handoff and resuming data transmission after handoff. Call supervision occurs via busy-idle bit coding.
320 Citations
63 Claims
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1. A radiotelephone data message transmission system for communicating data message via radio channels between remote subscriber stations and fixed site stations comprising:
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means for accepting a data message in a first format and for converting said first format to a second format; means for transmitting said data message in said second format on a first radio channel; means for receiving and reconverting said second format data message to said first format data message; means for generating a command to cease transmission of said data message; means for ceasing transmission of said data message upon receiving a command so instructing; and means for changing transmission from said first radio channel to a second radio channel and for commencing and transmitting said data message in said second format on said second radio channel thereby realizing a handoff. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A cellular radiotelephone system communicating data messages via radio channels between a plurality of remote subscriber stations having data terminals and at least one fixed site station connected to data terminals comprising:
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means for requesting data mode service by one of the remote subscriber stations; means for assigning a data radio channel to said requesting remote subscriber station and for communicating said assignment to said requesting remote subscriber station; means, at said requesting remote subscriber station, for acknowledging said assignment and responsively entering a data mode for transmission of a data message on said assigned data radio channel; means for converting the format of said data message to a radio channel format at said requesting remote subscriber station before transmission of said data message and for reconversion of said radio channel format to said data message format following reception of said message at the fixed site station; and means for monitoring at the fixed site station said data message for predetermined data bits identifying a particular fixed site station. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A cellular radiotelephone system communicating data messages and handoff commands via radio channels between a plurality of remote subscriber stations having data terminals and a network of fixed site stations connected to data terminals comprising:
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means for transmitting a handoff imminent command on a first radio channel from a first fixed site station to a remote subscriber station communicating a data message between first and second data terminals on said first radio channel; means for generating a signal for said first and second data terminals in response to said handoff imminent command thereby halting data communications between said first and second data terminals; means for detecting a lack of data transmitted by said first and second data terminals and for transmitting an acknowledge signal thereby initiating handoff; and means for changing from said first radio channel to a second radio channel of a second fixed site station and resuming data communication on said second radio channel thereby completing handoff. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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25. A data message communications system for a cellular radiotelephone system including a frame of data words preceeded by a predetermined bit pattern bit synchronization and a predetermined bit pattern word synchronization, each frame comprising:
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a first data word having a plurality of data bits comprising a control field, at least one character field for transmission of message data, and a parity field essentially developed, according to a predetermined code, from the bits of said control and character fields in said first data word; a second data word of a plurality of data bits comprising at least one character field for transmission of message data and a parity field essentially developed, according to said predetermined code, from the bits of said character field of said second data word; and a plurality of control bits interspersed at predetermined intervals with said data bits of said first and second data words. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A method of communicating data messages via radio channesl between remote subscriber stations and fixed site stations in a radiotelephone system comprising the steps of:
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accepting a data message in a first format and converting said first format to a second format; transmitting said data message in said second data format on a first radio channel; receiving and reconverting said second format data message to said first format data message; generating a command to cease transmission of said data message; ceasing transmission of said data message in said second data format upon detecting said generated command; and changing transmission from said first radio channel to a second radio channel, and commencing and transmitting said data message in said second data format on said second radio channel thereby realizing a handoff. - View Dependent Claims (38)
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39. A method of communicating data messages via radio channels in a cellular radiotelephone system between a plurality of remote subscriber stations having data terminals and at least one fixed site station connected to data terminals comprising the steps of:
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requesting data mode service by one of the remote subscriber stations; granting said data mode service to said requesting remote subscriber station; acknowledging said grant and entering said data mode with said requesting remote subscriber station for transmission of a data message on a data radio channel; converting the format of said data message into a radio channel format at said requesting remote subscriber station before transmission of said data message and reconverting said radio channel format to said data message format following reception of said message at the fixed site station; and monitoring said data message at the fixed site station for predetermined data bits identifying a particular fixed site station. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
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51. A method of communicating data messages and effecting handoff via a radio channel in a cellular radiotelephone system between a plurality of remote subscriber stations having data terminals and a network of fixed site stations connected with to data terminals comprising the steps of:
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transmitting a handoff imminent command on a first radio channel from a first fixed station to a remote subscriber station communicating a data message between first and second data terminals on said first radio channel; generating a signal for said first and second data terminals in response to said handoff imminent command, thereby halting data communications between said first and second data terminals; detecting a lack of data transmitted by said first and second data terminals and transmitting an acknowledge signal thereby initiating handoff; and changing from said first radio channel to a second radio channel of a second fixed site, and resuming data communication on said second radio channel thereby completing handoff. - View Dependent Claims (52, 53, 54, 55, 56)
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57. A radio data message transmission system for communicating data messages via radio channels between remote subscriber stations and fixed site stations comprising:
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means for accepting a data message in a first format and for converting said first format to a second format; means for transmitting said data message in said second format on a first radio channel; means for ceasing transmission of said data message and for changing transmission from said first radio channel to a second radio channel; and means for commencing and transmitting said data message in said second format on said second radio channel thereby realizing a handoff. - View Dependent Claims (58, 59, 60)
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61. A method of communicating data messages via radio channels between remote subscriber stations and fixed site stations in a radio system, comprising the steps of:
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accepting a data message in a first format and converting said first format to a second format; transmitting said data message in said second data format on a first radio channel; ceasing transmission of said data message in said second data format and changing transmission from said first radio channel to a second radio channel; and commencing and transmitting said data message in said second data format on said second radio channel thereby realizing a handoff. - View Dependent Claims (62, 63)
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Specification