Page 948 - 5G Basics - Core Network Aspects

2 Transport aspects

2) The FTU-R replies by sending the R-MSG 2 message, which indicates the FTU-R's TPS-TC, PMS-TC
and PMD related capabilities and time synchronization requirement and period.
3) The FTU-O sends the O-TPS message to indicate the configuration of the TPS-TC and its required
capabilities for both the upstream and the downstream directions.
4) The FTU-R acknowledges the O-TPS message with the R-ACK 1 message.
5) The FTU-O conveys the required PMS-TC parameters by sending the O-PMS message.
6) The FTU-R conveys the required PMS-TC parameters by sending the R-PMS message.
7) The FTU-O sends the O-PMD message, which contains the bit loading and tone ordering tables for
the upstream.
8) The FTU-R sends the R-PMD message, which contains the bit loading and tone ordering tables for
the downstream.
9) After exchanging O-PMD and R-PMD messages, the FTUs are ready to transition to showtime. The
FTU-O acknowledges R-PMD message by sending O-ACK message and further triggers the
transition into showtime by transmitting the O-P-SYNCHRO 6 signal.
The PMD, PMS-TC and TPS-TC parameter settings negotiated during the channel analysis and exchange
phase shall be applied starting from the first symbol of showtime. During the showtime some of these
parameters can be modified using various OLR procedures (see clause 13), although in the range
determined by the exchanged FTU capabilities.

12.3.4.2 SOC messages exchanged during channel analysis and exchange phase
Figure 12-13 illustrates the SOC message exchange between the FTU-O and FTU-R during the channel
analysis and exchange phase. It also summarizes the main content of each message.

O-MSG 1
– Conveys FTU-O capabilities (e.g., TPS-TC, PMS-TC, ToD)
R-MSG 2
– Conveys FTU-R capabilities (e.g., TPS-TC, PMS-TC, ToD)
O-TPS
– Sets properties of TPS-TCs
– Sets properties of NTR and ToD
R-ACK 1
– Acknowledge reception of the O-TPS message
O-PMS
– Conveys PMS-TC parameter selection for upstream
R-PMS
– Conveys PMS-TC parameter selection for downstream
O-PMD
– Conveys (bi, ti) for use in upstream
R-PMD
– Conveys (bi, ti) for use in downstream
O-ACK
– Acknowledge reception of the R-PMD message

Figure 12-13 – SOC messages exchanged during the channel analysis and exchange phase
12.3.4.2.1 O-MSG 1

The O-MSG 1 message contains the capabilities of the FTU-O and the main requirements for downstream
transmission (such as margin). The list of parameters carried by the O-MSG 1 message is shown
in Table 12-38.

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