Page 965 - 5G Basics - Core Network Aspects

Transport aspects 2

sending a R-TPS message and shall then wait for reception of an O-PMS message. The FTU-R shall
acknowledge the O-PMS message by sending a R-PMS message and shall then wait for reception of an
O-PMD message.
The FTU-R shall acknowledge the O-PMD message by sending a R-PMD message and shall then wait for
reception of an O-ACK message followed by an O-P-SYNCHRO 6 signal (transmitted six superframes after
O-ACK). After reception of the O-P-SYNCHRO 6 signal, the FTU-R shall transition into showtime as described
in clause 12.3.5.

12.3.5 Transition to showtime
The FTU-O shall transition to showtime starting from the symbol with index 0 of the downstream logical
frame immediately following the O-P-SYNCHRO 6 signal. The FTU-R shall transition to showtime one
superframe after the FTU-O transitions to showtime, starting from the symbol with index 0 of the first
upstream logical frame. Before that transition, the FTU-R shall send R-IDLE. All DTU’s of the downstream
logical frames of the first superframe following O-P-SYNCHRO 6 shall be dummy DTUs.
The baseline bit-loading table of the NOI of the first downstream logical frame in showtime shall be the one
specified in R-PMD message. The baseline bit-loading table and the gi values of the NOI of the first
upstream logical frame in showtime shall be one specified in O-PMD message. The baseline bit-loading
table of the DOI of the first downstream logical frame and the first upstream logical frame in showtime
shall be, respectively, the same as for NOI (both bi and gi values). Those baseline bit-loading tables shall be
indicated with SCCC=0 in the RMC. The FRA adjustment "no adjustment" shall be applied on the baseline
bit-loading tables in the first logical frame of showtime. This adjustment shall have an FCCC equal to 0.

If MB downstream is equal to 1, the configuration of the first downstream logical frame in showtime shall
be TTRds=sds, TAds=0, TBUDGETds=sds. Otherwise, the configuration of the first downstream logical frame is
indicated in the first downstream RMC message. The configuration of the first upstream logical frame in
showtime shall be as specified in previously received downstream RMC messages. If no RMC messages are
decoded correctly, the default value shall be TTRus=sus, TAus=0, TBUDGETus=sus.
The transmit PSD of the first showtime logical frame in the downstream and upstream directions shall be
STPSDds and STPSDus, respectively (NOI symbol position only). The STPSDds and STPSDus in the first
showtime logical frame in the downstream and upstream directions shall use the tssi that was used during
the channel analysis and exchange phase of initialization. The transmit PSD may be further adjusted using
the corresponding OLR procedures (see clauses 13.2.1.1 and 13.2.2.1).
The superframe count after transition into showtime and the probe sequences used during the initialization
for sync symbols shall continue from initialization with no interruption.

12.3.5.1 Establishment of DOI
In the downstream, the establishment of DOI shall be in two steps:
1) The VCE/DRA initiates a TIGA procedure (see clause 13.2.2.1) with a TIGA command containing
settings for the DOI interval (this TIGA command may or may not contain settings for the NOI as
well).
2) After a successful completion of the TIGA procedure, transmission in the DOI may be enabled by
the VCE/DRA by setting TBUDGET > TTR.

In the upstream, the establishment of DOI shall be in two steps:
1) The VCE/DRA initiates a SRA procedure (see clause 13.2.1.1) with an SRA command containing
settings for the DOI interval (this SRA command may or may not contain settings for the NOI as
well).

2) After a successful completion of the SRA procedure, transmission in the DOI may be enabled by
the VCE/DRA by setting TBUDGET > TTR.

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