High-speed data transmission in a mobile communications system

A data transmission method in a digital mobile communications system, the method comprising steps of

• transmitting data in radio frames via N traffic channels over a radio interface between a base station and a mobile station, where N≧2,
• providing the transmitted radio frames with at least one of frame and channel numbering in the mobile station and the base station,
• transmitting the data in transmission frames via M transmission channels between the base station and an interworking function, where M≧2N,
• providing the transmitted transmission frames with at least one of frame and channel numbering in the mobile station and the interworking function,
• placing, in the base station, the data of the radio frames in the transmission frames in an uplink direction, and
• placing, in the base station, the data of the transmission frames in the radio frames in a downlink direction,
• placing, in the base station, also the frame and channel numbering of the transmission frames in addition to the data as a payload of the radio frames in the downlink direction, and
• restoring order of the data frames in the mobile station by means of at least one of the frame and channel numbering of the radio frames,
• extracting at least one of the data and the frame and channel numbering of the transmission frames from the data frames,
• restoring order of the data in the mobile station based on as least one of said frame and channel numbering of the transmission frames,
• placing, in the base station, also at least one of the frame and channel numbering of the radio frames in addition to the data as the payload of the transmission frames in the uplink direction,
• restoring order of the transmission frames in the interworking function by means of at least one of the frame and channel numbering of the transmission frames,
• extracting the data and at least one of the frame and channel numbering of the radio frames from the transmission frames,
• restoring order of the data in the interworking function on the basis of at least one of said frame and channel numbering of the radio frames.

A digital mobile communications system, wherein

• a channel configuration of a transparent data call comprises N traffic channels at a radio interface between a base station and a mobile station, and M transmission channels between the base station and an interworking function, where N and M are positive integers and M≧2N, the data being transferred in transmission frames on transmission channels and in radio frames on radio interface traffic channels,
• the base station and the interworking function are configured to provide the transmitted transmission frames with at least one of frame and channel numbering in the base station and in the interworking function, the numbering enabling the restoration of order of the data,
• the base station being configured to place not only the data but also at least one of the frame and channel numbering of the transmission frames as a payload of the radio frames, and
• the mobile station being configured to restore the order of the data on the basis of at least one of said frame and channel numbering of the transmission frames.

A digital mobile communications system, wherein

• a channel configuration of a transparent data call comprises N traffic channels at a radio interface between a base station and a mobile station, and M transmission channels between the base station and an interworking function, where N≧2 and M≧2N, the data being transferred in transmission frames on transmission channels and in radio frames on radio interface traffic channels,
• the base station and the interworking function are configured to provide the transmitted transmission frames with at least one of first frame and channel numbering,
• the base station and the mobile station are configured to provide the transmitted radio frames with at least one of second frame and channel numbering,
• the base station being configured to place not only the data but also at least one of the first frame and channel numbering of the transmission frames as a payload of the radio frames in a downlink direction,
• the mobile station being configured to restore order of the radio frames, or to restore order of their payload by means of at least one of said second frame and channel numbering,
• the mobile station being configured to extract the data and at least one of said first frame and channel numbering from the payload of the radio frames,
• the mobile station being configured to restore order of the data on the basis of at least one of said first frame and channel numbering,
• the base station being configured to place not only the data but also at least one of the second frame and channel numbering of the radio frames as the payload of the transmission frames in an uplink direction,
• the interworking function being configured to restore order of the transmission frames, or to restore order of their payload by means of at least one of said first frame and channel numbering,
• the interworking function being configured to extract the data and at least one of said second frame and channel numbering from the payload of the transmission frames,
• the interworking function being configured to restore order of the data on the basis of at least one of said second frame and channel numbering.

A mobile station in a mobile communications system where a channel configuration of a transparent data call comprises N traffic channels at a radio interface between a base station and a mobile station, and M transmission channels between the base station and an interworking function, where N≧2 and M≧2N, the data being transferred in transmission frames on transmission channels and in radio frames on radio interface traffic channels, the transmission channels comprising at least one of frame and channel numbering that enables restoration of order of data if the order changes due to different transmission properties of the transmission channels, and the radio frames comprising at least one of second frame and channel numbering that enables restoration of order of data if the order changes due to different transmission properties of the radio interface traffic channels, the mobile station comprising

• means for receiving radio frames, which comprise at least one of said second frame and channel numbering, and the payload of which comprises, in addition to data, also at least one of said first frame and channel numbering,
• means for restoring order of the radio frames or their payload by means of at least one of said second frame and channel numbering,
• means for extracting the data and at least one of said first frame and channel numbering from the payload of the radio frames,
• means for restoring order of the data based on at least one of said first frame and channel numbering.