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An inter-frequency handoff execution method in a mobile communication system according to the present invention includes the steps of: transmitting from a base station a data frame in which a data transmission section and a frequency search section exist to an arbitrary mobile terminal; executing da

An inter-frequency handoff execution method in a mobile communication system according to the present invention includes the steps of: transmitting from a base station a data frame in which a data transmission section and a frequency search section exist to an arbitrary mobile terminal; executing data transmission in the data transmission section; searching a frequency of other base station in the frequency search section; and determining whether or not handoff is executed in accordance with the searched result.

대표청구항 ▼

An inter-frequency handoff execution method in a mobile communication system according to the present invention includes the steps of: transmitting from a base station a data frame in which a data transmission section and a frequency search section exist to an arbitrary mobile terminal; executing da

An inter-frequency handoff execution method in a mobile communication system according to the present invention includes the steps of: transmitting from a base station a data frame in which a data transmission section and a frequency search section exist to an arbitrary mobile terminal; executing data transmission in the data transmission section; searching a frequency of other base station in the frequency search section; and determining whether or not handoff is executed in accordance with the searched result. receiver converts the received digital radio signals to encoded digital signals and outputs them to an input of the digital buffer that stores a quantity of the encoded digital signals, the digital buffer having an output coupled to an input of the playback circuit which converts the encoded digital signals to audio signals for playing through the output circuit; the device comprising: a digital converter, for converting the encoded digital signals to decoded industry standard audio storage format signals, said converter having an input for receiving the encoded digital signals from the output of the buffer in the satellite digital audio service receiver, an output for outputting the decoded signals, and an enabling input for enabling said digital converter to convert the decoded digital signals to decoded signals; smartcard module for receiving a smartcard having a prepaid account balance stored thereon, said smartcard module having an enabling output coupled to said enabling input; a digital recorder having an input coupled to said output of said digital converter for receiving the decoded signals, said digital recorder adapted to receive a recording medium and record thereon the decoded signals; and means for enabling said digital recorder if the account balance on said smartcard is above a predetermined amount. 9. The invention of claim 8 wherein said digital recorder is adapted to receive a CD-ROM recording medium. 10. The invention of claim 8 wherein said digital recorder is adapted to receive a Mini-Disk recording medium. 11. The invention of claim 8 wherein said digital recorder is adapted to receive a Digital Audio Tape recording medium. 12. The invention of claim 8 wherein said digital recorder is adapted to receive a memory card recording medium. 13. The invention of claim 8 wherein said digital recorder further comprises a playback circuit adapted to read the decoded signals from said recording medium, said playback circuit having a converter for converting the decoded signals to audio signals, said playback circuit having an output four outputting said audio signals. 14. The invention of claim 13 wherein said output of said playback circuit is coupled to the input of the output circuit of the satellite digital audio service receiver. 15. The invention of claim 8 further comprising: a digital buffer having an output coupled to said input of said digital converter and having an input coupled to receive encoded digital signals for storage in said digital buffer, and wherein stored encoded digital signals are output to said digital converter for playback through said playback circuit. 16. A system for prepaid recording of decoded digital audio signals from a satellite digital radio broadcast system; the system comprising: a satellite digital audio service receiver, for receiving digital radio signals, further comprising; a digital radio receiver having an input for receiving the digital radio signals and an output for outputting encoded digital signals, said digital radio receiver adapted to convert the digital radio signals to encoded digital signals; a buffer for storing a quantity of encoded digital signals, and having an input coupled to said output of said digital radio receiver and an output for outputting stored encoded digital signals, a playback circuit adapted to convert the encoded digital signals to audio signals, and having an input coupled to said output of said buffer, and an output for outputting said audio signals; an output circuit for outputting said audio signals, and having an input for receiving said audio signals from said output of said playback circuit and a device for recording decoded digital signals, further comprising; a digital converter, for converting said encoded digital signals to decoded industry standard audio storage format signals, said converter having an input for receiving said encoded digital signals from said output of said buffer in said satellite digi tal audio service receiver, an output for outputting said decoded signals, and an enabling input for enabling said digital converter to convert said encoded digital signals to decoded signals; a smartcard module for receiving a smartcard having a prepaid account balance stored thereon, said smartcard module having an enabling output coupled to said enabling input, and wherein said enabling output enables said enabling input if a smartcard having a prepaid account balance greater than zero is presently inserted into said smartcard module; a digital recorder having an input coupled to said output of said digital converter for receiving said decoded signals, said digital recorder adapted to receive a recording medium and record thereon the decoded signals. 17. The invention of claim 16 wherein said digital recorder is adapted to receive a CD-ROM recording medium. 18. The invention of claim 16 wherein said digital recorder is adapted to receive a Mini-Disk recording medium. 19. The invention of claim 16 wherein said digital recorder is adapted to receive a Digital Audio Tape recording medium. 20. The invention of claim 16 wherein said digital recorder is adapted to receive a memory card recording medium. 21. The invention of claim 16 wherein said digital recorder further comprises a playback circuit adapted to read the decoded signals from said recording medium, said playback circuit having a converter for converting the decoded signals to audio signals, said playback circuit having an output for outputting said audio signals. 22. The invention of claim 16 wherein said output of said playback circuit is coupled to said input of said output circuit of said satellite digital audio service receiver. 23. A method of prepaid recording of decoded digital audio signals from a satellite digital radio broadcast system by a satellite digital audio service receiver and a device for recording decoded digital signals, which include a digital radio receiver, a buffer, a digital converter, a digital reorder for recording to a digital medium, a smartcard module, and a smartcard having an account balance stored thereon; comprising the steps of: receiving digital radio signals by the digital radio receiver and outputting encoded digital signals; storing a portion of said encoded digital signals in the buffer; initiating a recording function to record a selection of said decoded digital signals; reading the smartcard by the smartcard module to determine the value of an account balance stored thereon and if said account balance value is greater than zero, enabling the digital converter to convert said encoded digital signals to decoded industry standard audio storage format signals; recording said decoded signals by the digital recorder to a recording medium, and writing to the smartcard thereby reducing said account balance value in accordance with the quantity of decoded digital signals recorded on said medium. 24. The method of claim 23 wherein the recording and writing steps are not accomplished unless the beginning of the present selection of decoded data is stored in said buffer at the time the initiating step is executed. 25. The method of claim 23 further comprising the step of: checking by the digital recorder for the availability of recording space on the recording medium and wherein the recording and writing step are not accomplished unless there is sufficient recording space to record the presently selected selection of decoded signals. a traffic channel in a telecommunication system, characterized in that the transmitting equipment (TAF IWF, LES) is arranged to monitor whether user data elements of end-to-end protocol data units are received at the terminal interface, the transmitting equipment (TAF, IWF, LES) is arranged to transmit the terminal interface status information in the redundant data elements of said end-to-end protocol data units through the traffic channel or group of traffic channels when user data elements are received, the transmitting equipment (TAF, IWF, LES) is arranged to generate auxiliary frames and to transmit the terminal interface status information in the auxiliary frames when no user data elements are received, the receiving equipment (TAF, IWF, LES) is arranged to separate the terminal interface status information from said redundant data elements or said auxiliary frames at the receiving end, and to restore the original redundancy to the data elements. 9. A transmitting and receiving equipment according to claim 8, characterized in that the equipment is a terminal adaptation function (TAF) of a mobile station, an interworking function (IWF) of a mobile communications network, or a land earth station (LES) of a satellite system. 10. A transmitting and receiving equipment according to claim 8 or 9, characterized in that the nominal user data rate of the traffic channel, the radio interface rate, and the user data rate of the terminal interface are equal, e.g. 14400 bit/s or 4800 bit/s. 11. A transmitting and receiving equipment according to claim 8, characterized in that the equipment is arranged to transmit the terminal interface status information in the auxiliary frames in at least one of the following situations: at a call set-up stage before user data transmission is started, during a call set-down after the user data transmission has ended, during a pause in the user data transmission initiated by flow control, and due to failures appearing in sections of an end-to-end connection other than said traffic channel. 12. An equipment according to claim 8, characterized in that said redundant data element of the end-to-end protocol data unit comprises at least one of the following: the address field of an end-to-end protocol data unit supporting point-to-multipoint transmission in a telecommunication system that supports point-to-point transmission, a facsimile service synchronization frame, a status frame, and stuffing information at the end of a facsimile-coded line. 13. An equipment according to claim 8, characterized in that said redundant data element of the end-to-end protocol data unit comprises start and stop bits (START, STOP) of asynchronous data characters concatenated to form a single protocol unit.