Page 997 - 5G Basics - Core Network Aspects

Transport aspects 2

13.4.1.5.2 Maximum Net Data Rate in L2.1 (L2.1_NDR_max)

The L2.1_NDR_max is a control parameter that specifies the maximum allowed value for the net data rate
at L2.1 entry and during the L2.1 link state, L2.1_NDR (see clause 13.4.4.2).
It is used in the L2.1 entry policy and in the L2.1 operation policy.
The field shall be formatted as a 16-bit unsigned integer with LSB weight of 16 kbit/s and has a valid range
16
of values from 4 × L2.1_ETR_min kbit/s to (2 -1)×16 kbit/s (see clause 13.4.4.1), further limited to the
possible values based on valid values of framing parameters.
The control parameter L2.1_NDR_max is derived by the DRA from the DPU-MIB maximum net data rate in
the L2.1 link state (L2.1-MAXNDR) configuration parameters.
This control parameter is defined separately for upstream and downstream.

13.4.1.5.3 Target SNR margin in L2 (L2_TARSNRM)
The L2_TARSNRM is a control parameter that specifies the target SNR margin for the FTU receiver. This is
the SNRM value that the FTU receiver shall achieve, or better, to successfully complete L2.1 entry.
It is used in the L2.1 entry policy, L2.1 L2TSA procedure and L2.2 entry policy.

The field shall be formatted as a 16-bit unsigned integer with LSB weight of 0.1 dB and has a valid range of
values from 0 to 31.0 dB (013616) (see clause 13.4.4.1).
The control parameter L2_TARSNRM shall be set to the same value as the DPU-MIB configuration
parameter L2TARSNRM.
The parameter values may be different for upstream and downstream.

13.4.1.5.4 Maximum SNR margin in L2.1 (L2.1_MAXSNRM)
The L2.1_MAXSNRM is a control parameter that specifies the maximum SNR margin for the

FTU receiver. This is the maximum SNRM value that the FTU receiver shall achieve, or lower, to successfully
complete L2.1 entry.

It is used in the L2.1 entry policy and L2.1 L2TSA procedure.
The field shall be formatted as a 16-bit unsigned integer with LSB weight of 0.1 dB and has a valid range of
values from 0 to 31.0 dB (013616) (see clause 13.4.4.1).
NOTE – Configuration of too high L2.1_MAXSNRM values may lead to lower power savings.
The control parameter L2.1_MAXSNRM shall be set to the same value as the DPU-MIB configuration
parameter L2.1MAXSNRM.
The parameter values may be different for upstream and downstream.

13.4.1.5.5 Maximum PSD reduction in L2 (L2_PSDR_max)

The L2_PSDR_max is a control parameter that specifies the maximum PSD reduction L2_PSDR allowed to be
requested by the FTU-O in the L2.1-Entry-Request (i.e. L2_PSDR≤ L2_PSDR_max).

It is used in the L2.1 entry policy.
The field shall be formatted as a 16-bit unsigned integer with LSB weight of 1 dB and has a valid range of
values from 0 to 10 dB (000A16) (see clause 13.4.4.1).
The control parameter L2_PSDR_max shall be set to the same value as the DPU-MIB configuration
parameter L2-MAXPSDR.
The parameter value is identical for upstream and downstream.

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