Method of selecting transport format combination, and mobile terminal apparatus

#This invention relates to a method of selecting a transport format combination (TFC) and to a mobile terminal apparatus. More particularly, the invention relates to a TFC selection method for performing a TFC selection in such a manner that maximum transmission power of the apparatus will not be exceeded or in such a manner that an appropriate transmission power will be obtained, and to a mobile terminal that employs this method.

#FIG. 13 is a block diagram illustrating a CDMA mobile terminal device according to the prior art. User data and control data, sent from a plurality of terminal access function units (abbreviated to “TAF” below) la to in and a host application 2 upon being mapped to prescribed local channels (abbreviated to “LCH” below), is collected together in a terminal access function interface (abbreviated to “TAF IF” below) 3. The TAF IF 3 has a TFC decision unit 3a for checking the state of a connection between an LCH and a transport channel (abbreviated to “TrCH” below) from connection information designated beforehand by a higher layer. If the LCH has been connected to the TrCH, then, in accordance with transport format information (a TFI table) that specifies one or more transport data lengths of prescribed transmission time intervals TTI of the TrCHs designated similarly by the higher layer, the TFC decision unit 3a decides a combination TFC of transport formats of TrCHs capable of transmitting as much data as possible. Here TTI, TFI and TFC are the abbreviations of Transmission Time Interval, Transport Format Indicator and Transport Format Combination, respectively.

#The TAF IF 3 has a TrCH data demultiplexer 3b for recognizing transport data length every transmission time interval TTI of each TrCH based upon the TFC that has been decided, separating the transport data of each TrCH every transmission time interval TTI based upon the transport data length, and inputting the separated data to a channel codec. In the description that follows, it is assumed that the number of TrCHs is four and that the TTIs of respective ones of the TrCHs are 10 ms, 20 ms, 40 ms and 80 ms.

#FIG. 1 is a block diagram illustrating the structure of a mobile terminal (mobile station) according to the present invention;

#FIG. 2 is a block diagram of a transmission power monitor and peripheral units;

#FIG. 3 is a block diagram of a class changeover unit;

#(A) Structure of Mobile Communication Terminal (Mobile Station) According to the Invention

#FIG. 1 is a block diagram illustrating the structure of a mobile communication terminal (mobile station) according to the present invention. User data and control data, sent from a plurality of terminal access function units (abbreviated to “TAF” below) 51a to 51n and a host application 52 upon being mapped to prescribed local channels (LCH), is collected together in a terminal access function interface TAF IF 53. The TAF IF 53 has a TFC decision unit 53a for checking the state of a connection between an LCH and a transport channel (abbreviated to “TrCH” below) from connection information designated beforehand by a higher layer. If the LCH has been connected to the TrCH, then, in accordance with transport format information (a TFI table) that specifies transport data lengths of prescribed transmission time intervals TTI of the TrCHs designated similarly by the higher layer, the TFC decision unit 53a decides a combination TFC of transport formats of TrCHs capable of transmitting as much data as possible.

#The TAF IF 53 has a TrCH data demultiplexer 53b for recognizing transport data length every transmission time interval TTI of each TrCH based upon the TFC that has been decided, separating the transport data of each TrCH every transmission time interval TTI based upon the transport data length, and inputting the separated data to a channel codec 54.