Page 1038 - 5G Basics - Core Network Aspects

2 Transport aspects

from the FTU-R according to the new Mds value with an US RMC symbol at the correct position. This
completes the DTA update procedure.

The FTU-O may continue sending the 'DTA update' RMC command with the updated Mds value and
DTAFDC=0 in the following frames, until a new request to update the Mds is received from the DRA.

The FTU-O shall not initiate a new DTA update procedure until the current update procedure has been
completed.

X.6.7 Transceiver related DTA control parameters
The following control parameters facilitate DTA and Annex X operation on transceiver level:
• Annex X operation mode (Annex_X_mode);

• DTA allowed (DTA_allowed);
• Handshake Mds (hs_Mds);
• Minimum Mds for DTA (DTA_min_Mds);
• Maximum Mds for DTA (DTA_max_Mds);
• Maximum net data rate for DTA (DTA_NDR_max);

• Maximum net data rate (NDR_max);
• Minimum expected throughput (ETR_min).
Some of the parameters specified in this section are DRA control parameters (see Annex T) that are also
used by the FTUs.

X.6.7.1 Annex X operation mode (Annex_X_mode)
The control parameter Annex_X_mode is used to control the activation of Annex X operation.
This parameter has 3 valid values:

0: AnnexX_FORBIDDEN: Operation according to Annex X is not allowed. Annex X operation mode
shall not be selected during the handshake phase of initialization. In this case the "Annex X
operation" bit in the FTU-O CL message NPar(2) (see Table X.5) shall be set to ZERO.
1: AnnexX_PREFERRED: Operation according to Annex X is preferred. Annex X operation mode shall
be selected during the handshake phase of initialization if and only if both FTUs support Annex X
operation mode and they share a common profile. In this case the "Annex X operation" bit in the
FTU-O CL message NPar(2) (see Table X.5) shall be set to ZERO if the FTU-O does not support
operation according to Annex X and shall be set to ONE if the FTU-O supports operation according
to Annex X.
2: AnnexX_FORCED: Operation according to Annex X is forced. If one or both of the FTUs does not
support Annex X, the handshake procedure shall terminate with 'no mode selected' (see
Figures 12-4 and 12-5). In this case the "Annex X operation" bit in the FTU-O CL message NPar(2)
(see Table X.5) shall be set to ZERO if the FTU-O does not support operation according to Annex X
and shall be set to ONE if the FTU-O supports operation according to Annex X.

The control parameter Annex_X_mode shall be set to the same value as the DPU-MIB configuration
parameter ANNEX_X_MODE.

X.6.7.2 DTA allowed (DTA_allowed)

The control parameter DTA_allowed determines whether DTA operation is allowed with valid values 1
(allowed) and 0 (not allowed). If DTA operation is allowed and Annex X operation mode is selected, the
FTU-O shall enable DTA and indicate this to the FTU-R during initialization (see clause X.7.2.1).
The control parameter DTA_allowed shall be set to the same value as the DPU-MIB configuration
parameter DTA_ALLOWED.

1028