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AssigneeNone recorded
InventorsUlrich Dropmann, Ralf Haferbeck, Eva-Maria Lanig
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The invention allows a voice data transmission in a mobile radio network to be optimized by means of a conversion device. Said device converts voice data that has been transmitted a TRAU 3 in a TFO mode into a packet data format, for transmission to an additional switching device via a long-distance switching network, thereby adapting the signaling if necessary.
A method for transmitting voice data in a mobile radio network, characterized in that voice data that have been transmitted in a conventional manner (4) from an end device (ME 1) to a transcoding and rate adaptation unit (TRAU 3) are converted, without transcoding, into a format having a larger bandwidth (64 Kbit) by a conversion unit (TFO-TrFO converter 7), then transmitted from a trunk-junction unit (MSC 5) into a packet-switching telecommunications network (6) for transmission to a further switching device.
The method according to one of the foregoing claims, characterized in that the packet-data format is an Internet-protocol format or an ATM-protocol format, particularly ATM-AAL2.
The method according to one of the foregoing claims, characterized in that parameters are derived from the signaling transmitted from a transcoding and rate adaptation unit (TRAU 3) via a TFO voice-data channel to the conversion device, and are used to determine parameters for a codec parameter negotiation (codec negotiation) with devices of the mobile radio network, and/or for a codec mode modification.
The method according to one of the foregoing claims, characterized in that a conversion device (7) emulates a transcoding and rate adaptation unit (TRAU 3) in the non-TRAU transcoding mode (=TFO).
The method according to one of the foregoing claims, characterized in that the conversion device is located in a switching device (MSC) of the mobile radio network for transmitting voice data into/from a trunk-junction telecommunications network for the mobile radio network.
An apparatus (MSC 5;
The apparatus according to one of the foregoing claims, characterized in that it is embodied such that it converts the voice data into a predetermined format (TFO) and transmits them to a transcoding and rate adaptation unit (TRAU) for further switching to an end device.
The apparatus according to one of the foregoing apparatus claims, characterized in that the packet-data format is an Internet-protocol format or an ATM-protocol format, particularly ATM-AAL2.
The apparatus according to one of the foregoing apparatus claims, characterized in that it is embodied such that, in the conversion device, parameters are derived from the signaling transmitted from a transcoding and rate adaptation unit (TRAU 3) via a TFO voice-data channel to the conversion device, and are used to generate a signaling from the switching device to a further switching device.
The apparatus according to one of the foregoing apparatus claims, characterized in that it is embodied such that parameters are derived from the signaling transmitted from a transcoding and rate adaptation unit (TRAU 3) via a TFO voice-data channel to the conversion device, and are used to determine parameters for a codec parameter negotiation (codec negotiation) with devices of the mobile radio network, and/or for a codec mode modification.
The apparatus according to one of the foregoing apparatus claims, characterized in that it is embodied such that a conversion device (7) emulates a transcoding and rate adaptation unit (TRAU 3) in the non-TRAU transcoding mode (TFO).
The apparatus according to one of the foregoing apparatus claims, characterized in that the conversion device is located in a switching device (MSC) of the mobile radio network for transmitting voice data into/from a trunk-junction telecommunications network for the mobile radio network.
Dependencies are inferred from the claim text.
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Service support devices; Network management devices: transcoding devices; Rate adaptation devices
Wireless communication networks
Term end not estimated
Mobile radio networks are known to persons skilled in the art from, for example, the technical book by Jacek Biala, “Mobilfunk und intelligente Netze [Mobile Radio and Intelligent Networks],” Vieweg-Verlag [publisher], ISBN 3-528-15302-4, particularly pp. 124-125. A mobile radio network of this type can include a Transcoding and Rate Adaptation Unit (TRAU) in a BSS, which converts voice data coming from radio channels (at, for example, 16 Kbit/s full rate) for transmitting over 64-Kbit/s channels of a trunk junction (e.g., transmitting over a lengthy fixed-network segment, etc., for the core network of a mobile radio network). In a transmission from a mobile station via a TRAU, a trunk-junction telecommunications network and a further TRAU to another mobile station, the multiple conversions in the two TRAUs (that is, in the TRAU tandem) lead to a loss of quality; consequently, a so-called Tandem Free Operation (TFO), namely a transmission without a conversion in the two aforementioned TRAUs of a data path between two Mobile Stations MS, has been proposed for GSM mobile radio networks (GSM 03.53 version 8.00, R1999).
It is the object of the present invention to improve the efficiency of a transmission between end devices via a mobile radio network. The object is accomplished by the subjects of the respective independent claims.
A method and a conversion device (TFO-TRFO converter), respectively, according to the invention permit a simple, efficient, UMTS-compatible (3GPP TS 23.153) bandwidth utilization for a voice-data transmission on a trunk-junction segment.
Further features and advantages of the invention ensue from the claims and the following description of an exemplary embodiment, with reference to the drawings. Shown are:
FIG. 1 a block diagram of the transmission of data from a mobile station via a TRAU to an MSC with a conversion device; and
FIG. 2 a block diagram of the functional blocks of a conversion device, in particular.
FIG. 1 illustrates a mobile station 1, which utilizes a voice-data and signaling connection 2 (air interface) to a transcoding and rate adaptation unit TRAU 3. The TRAU 3 has a voice-data and signaling connection 4 to a switching device (MSC) 5. Disposed in the switching device MSC 5 is a conversion device (converter) according to the invention, which is used to repackage the voice data coming from the TRAU 3 (4) into ATM-AAL2 packets, IP packets or other packets for further transmission via a trunk-junction telecommunications network (to another MSC, etc.). The signaling data transmitted from the TRAU 3 are employed in generating the necessary signaling (inband and/or outband) for the transmission of voice data via the voice-data and signaling channel 6.
FIG. 2 clarifies the design of the conversion device in or at the switching device MSC 5. In FIG. 2, voice data and signaling data come from a radio system (for example, GSM-BSS) via a transcoding and rate adaptation unit TRAU 3 with a TFO capability (capability of transmitting without transcoding), and the channel 4 to an MSC having a conversion unit. On the side of the MSC 5, the conversion device 7 effects the conversion of the inband TFO signaling (transmitted via the channel 4) transmitted from a TRAU 3 via the channel 4 to the MSC 5 into an interworking with a CC signaling (BICC) and/or an interworking with an IU-UP protocol (for example, with respect to a rate control). Moreover, on the side of the switching device MSC, the conversion device 7 effects an emulation of a peer TRAU (9) in the TFO signaling mode. Voice data transmitted from the TRAU 3 via a voice channel/signaling channel 4 are extracted from the module 10 and transmitted further, as packet data (here ATM-AAL2 or IP), via a channel 6 to a further switching device, etc., via a trunk-junction telecommunications network.
Corresponding to a conversion of voice data and signaling data coming from a TRAU 3 in a converter 7 on the side of an MSC 5, a converter on the side of a further MSC converts the voice data and signaling data (after the signaling data and voice data have been transmitted via a channel 6) into a conventional form for transmission to a further TRAU.