Page 981 - 5G Basics - Core Network Aspects

Transport aspects 2

Figure 13-6 – TIGA procedure with non-segmented messages

In response to a TIGA-ACK or TIGARESP message, the VCE shall instruct (over the γ_MGMT interface), the
FTU-O to either:

– send an SRA-R RMC command (see Table 9-4 and Table 9-15), to indicate the symbol position on
which both FTU-O and FTU-R implement the new parameters values (see clause 13.2.2.1.2 for
details and timing). The value of SCCC that the FTU-O shall send in the SRA-R command, shall be
instructed by the VCE over the γ_MGMT interface with one of the following options:
• the value of SCCC as received in the TIGARESP message, to indicate that the FTU-O did receive
the TIGARESP message, and that the precoder, the relative gain compensation factors ri, the
baseline bit loading table and all other parameter values shall be established corresponding to
the values requested in the TIGARESP message, or
• the special value SCCC=1111, to indicate that the FTU-O did not receive the TIGARESP
message, but that nevertheless the precoder, the relative gain compensation factors ri, and
the baseline bit loading table shall be established corresponding to the values indicated in the
TIGA command, while all other parameter values which are part of a TIGARESP message shall
stay unchanged, or
• the special value SCCC=1110, to indicate that the FTU-O did not receive the TIGARESP
message, but that nevertheless the precoder and the relative gain compensation factors ri
shall be established corresponding to the values indicated in the TIGA command, while the
baseline bit loading tables and all other parameter values that are part of a TIGARESP message
shall stay unchanged, or
• the special value SCCC=1101, to indicate that the FTU-O did not receive a TIGA-ACK, but that
nevertheless the precoder and the relative gain compensation factors ri shall be established
corresponding to the values indicated in the TIGA command while the baseline bit loading
table and all other parameter values that are part of a TIGARESP message shall stay
unchanged, or
• resend the OLR request type 3 (TIGA) command in case the FTU-O did not receive the TIGA
ACK.

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