Page 718 - 5G Basics - Core Network Aspects

2 Transport aspects

Figure 8-3 – Data flow primitives

At the FTU-O side, the upper layers include the control functionality required for coordination of the
resource allocation, vectoring and timing (DRA, VCE and TCE functionality, respectively, as described in
clause 5.1 and as shown in Figure 5-2) over various transceivers in the vectored group.

The DRA primitives at the γO reference point are summarized in Table 8-3. The physical implementation of
these primitives is vendor discretionary.
The DRA primitives at the γR reference point are summarized in Table 8-4. The physical implementation of
these primitives is vendor discretionary.
Table 8-3 – DRA related primitives of the data flow at the γO reference point

Primitive name (parameters) Direction Description
TXOPds.indicate (TBUDGETds, DRA → FTU-O Indicates that the FTU-O shall be configured with
TTRds, TAds, TIQ, IDFds) downstream transmission opportunities according to the
values of the TBUDGETds, TTRds, TAds, TIQ and IDFds
parameters (defined in clause 10.7).
TXOPus.indicate (TBUDGETus, DRA → FTU-O Indicates that the FTU-O shall communicate the
TTRus, TAus, IDFus) configuration of the upstream transmission opportunities
to the FTU-R according to the values of the TBUDGETus,
TTRus, TAus, and IDFus parameters (defined in clause 10.7).
DRRus.request (NDRR, NRM) DRA → FTU-O Requests the FTU-O to send the values of NDRR (Note 1)
and NRM (Note 2) to the FTU-R (see clause 11.2.2.17).
DRRus.confirm FTU-O → DRA Confirms that the FTU-R is configured with the NDRR value
requested by the DRRus.request primitive.
DRRus.indicate (DRRus) FTU-O → DRA Indicates the upstream dynamic resource report (defined
in Table 9-17) as indicated by the FTU-R in the last sent
upstream RMC message.
DRRus.config.request (DRRdata) DRA → FTU-O Requests the FTU-O to send the far-end DRR
configuration request data to the FTU-R (defined in clause
11.2.2.17).
DRRus.config.confirm (DRRdata) FTU-O → DRA Far-end DRR configuration confirmation data in response
to the DRRconfig.request primitive.
Indicates whether or not the FTU-R is operating on
Battery-operation (BAT) FTU-O → DRA
reserve batteries.
Requests the link to either transition to or remain in the
link state indicated by the LinkState parameter: L0, L2.1N,
LinkState.request (LinkState) DRA → FTU-O L2.1B, L2.2, or L3 (see clause 12.1.1.1). Upon a change of
the LinkState parameter, the link shall transition to the
indicated new link state (Note 3).

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