4.2.14 Transport format detection
25.2223GPPMultiplexing and channel coding (TDD)Release 17TS
Transport format detection can be performed both with and without Transport Format Combination Indicator (TFCI). If a TFCI is transmitted, the receiver detects the transport format combination from the TFCI. When no TFCI is transmitted, so called blind transport format detection may be used, i.e. the receiver side uses the possible transport format combinations as a priori information.
4.2.14.1 Blind transport format detection
Blind Transport Format Detection is optional both in the UE and the UTRAN. Therefore, for all CCTrCH a TFCI shall be transmitted, including the possibility of a TFCI code word length zero, if only one TFC is defined.
4.2.14.2 Explicit transport format detection based on TFCI
4.2.14.2.1 Transport Format Combination Indicator (TFCI)
The Transport Format Combination Indicator (TFCI) informs the receiver of the transport format combination of the CCTrCHs. As soon as the TFCI is detected, the transport format combination, and hence the individual transport channels’ transport formats are known, and decoding of the transport channels can be performed.