Page 982 - 5G Basics - Core Network Aspects

2 Transport aspects

Figure 13-7 shows the flowchart of the above TIGA procedure.

NOTE 1 – The detailed behaviour of the decision process by the VCE and management functions above the γ_MGMT
interface are out of the scope of this Recommendation. Appendix II gives example use cases.

Figure 13-7 – Flowchart of TIGA procedure

The FTU-R shall implement the received SRA-R command as follows:
– If the value of SCCC is as initiated in the TIGARESP message, the FTU-R shall implement the
parameter values it indicated in the TIGARESP message.

– If the SCCC value is the special value SCCC=1111, the FTU-R shall adapt its receiver settings in
accordance with the gains and the baseline bit loading table as indicated in the last TIGA command
(all other parameter values which are part of a TIGARESP message shall be unchanged).
– If the SCCC value is the special value SCCC=1110, the FTU-R shall adapt its receiver settings in
accordance with the gains as indicated in the last TIGA command (the baseline bit loading table
and other parameter values which are part of a TIGARESP message shall be unchanged).

– If the SCCC value is the special value SCCC=1101, the FTU-R should expect an unknown change in
received signal magnitude and phase when SFDC reaches zero.
NOTE 2 – Use of the special values SCCC=1111, 1110 and 1101 may cause errors and/or may cause retrain.

13.2.2.1.1 Parameters controlled by the TIGA procedure

13.2.2.1.1.1 Parameters controlled by the TIGA request
The parameters are described in Table 13-7.

Table 13-7 – Parameters in a TIGA request

Parameter Definition

i_start Start subcarrier index.
i_stop Stop subcarrier index.
ri Relative gain compensation factors for the FTU-R receiver gain stage, specified per subcarrier.
Values may be real or complex. Valid values are specified in clause 11.2.2.5.
bi Requested number of bits per subcarrier to be allocated by the FTU-R.
Valid values are all integers in the [0:FTU-O maximum bit loading] range. "FTU-O maximum bit
loading" is a capability indicated during initialization by the FTU-O in the O-MSG 1 message.

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