Method of transmitting data, in particular GSM data
First Claim
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1. A method for transmitting digitized data between a calling subscriber unit and a called subscriber unit of a mobile radio network using a predefined frame format, comprising:
- establishing a connection between the calling subscriber unit and the called subscriber unit, signaling, with the aid of a first transcoding device assigned to the calling subscriber unit, to a second transcoding device assigned to the called subscriber unit, that the first transcoding device is capable of tandem-free operation, the signaling taking place for a predefined period of time;
switching over the first and second transcoding devices to a tandem-free operation, after they have detected the signaling; and
exchanging speech parameters between the first and second transcoding devices;
wherein a data stream between the first and second transcoding devices is subdivided into a first data stream having speech sampling values and a second data stream, during both the signaling and the exchanging of speech parameters, and wherein the second data stream contains identification information during the signaling and contains speech parameters for speech-data reconstruction during the exchanging, and wherein the signal parameters are transmitted in transcoding rate adaption unit frames immediately after the transmission of the identification information.
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Abstract
The data stream between the transcoders (TCE1, TCE2) of a mobile wireless system is subdivided into a first data stream with samples for transmission and a second data stream with signal parameters for reconstruction of user data and/or for signaling. Both data streams are transmitted at the same time in particular in a handshake phase.
The invention permits an improvement in the quality of transmitted data, e.g., speech data in a GSM network in tandem operation between mobile subscribers, in particular during a handshake phase.
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8 Claims
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1. A method for transmitting digitized data between a calling subscriber unit and a called subscriber unit of a mobile radio network using a predefined frame format, comprising:
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establishing a connection between the calling subscriber unit and the called subscriber unit, signaling, with the aid of a first transcoding device assigned to the calling subscriber unit, to a second transcoding device assigned to the called subscriber unit, that the first transcoding device is capable of tandem-free operation, the signaling taking place for a predefined period of time;
switching over the first and second transcoding devices to a tandem-free operation, after they have detected the signaling; and
exchanging speech parameters between the first and second transcoding devices;
wherein a data stream between the first and second transcoding devices is subdivided into a first data stream having speech sampling values and a second data stream, during both the signaling and the exchanging of speech parameters, and wherein the second data stream contains identification information during the signaling and contains speech parameters for speech-data reconstruction during the exchanging, and wherein the signal parameters are transmitted in transcoding rate adaption unit frames immediately after the transmission of the identification information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification