Page 971 - 5G Basics - Core Network Aspects

Transport aspects 2

The timing to apply SRA is specified in clause 13.2.1.1.5.

Both the receiver and the transmitter shall support all valid bi values and shall support any change of these
values provided the resulting bi value is within the specified valid range.
SRA is accomplished by a change of the following PMS-TC parameters: BD, BDR, KFEC, RFEC and Q
(see Table 9-2).
13.2.1.1.1.2 Parameters controlled by autonomous SRA in upstream

The details on formatting of bits and gains parameters are described in Table 13-3.

Table 13-3 – PMD parameters in autonomous SRA request in upstream

Parameter Definition
bi The number of bits per subcarrier with valid values all integers in the [0:FTU-R maximum bit
loading] range. "FTU-R maximum bit loading" is a capability indicated by the FTU-R during
initialization in the R-MSG 2 message.
gi The subcarrier gain adjustments. Valid values for the upstream are specified in clause 11.2.2.5.

Autonomous SRA in upstream without change in gi may be implemented using OLR request type 1 or 2.
Autonomous SRA in upstream with change in gi shall be implemented using OLR request type 2.
Both the receiver and transmitter shall support all valid bi values and shall support any change of these
values provided the resulting bi value is within the specified valid range.
SRA is accomplished by a change of the following PMS-TC parameters: BD, BDR, KFEC, RFEC and Q (see
Table 9-2).
13.2.1.1.2 Parameters controlling the SRA procedures

The list of parameters controlling SRA procedures is presented in Table 13-4.

Table 13-4 – Parameters controlling the SRA procedures

Parameter Definition
RA-USNRM The rate adaptation upshift SNR margin and time interval.
RA-UTIME These parameters define the interval of time the SNR margin should stay above the upshift SNR
(Note) margin before the FTU shall attempt to increase the net data rate..
The parameter can be different for the FTU-O (RA-USNRMus and RA-UTIMEus) and the FTU-R
(RA-UTIMEds, RA-USNRMds).
FTU-O: Configured through the DPU-MIB.
FTU-R: Configured through the DPU-MIB and communicated to the FTU-R during initialization
(O-MSG 1 message).
The valid values for RA-USNRMus and RA-USNRMds are values from zero to 31.0 dB in steps of 0.1
dB.
The valid values for RA-UTIMEus and RA-UTIMEds are values from 0 to 16 383 s in steps of 1
second.

RA-DSNRM The rate adaptation downshift SNR margin and time interval.
RA-DTIME These parameters define the interval of time the SNR margin should stay below the downshift
(Note) SNR margin before the FTU shall attempt to decrease the net data rate.
The parameter can be different for the FTU-O (RA-DSNRMus and RA-DTIMEus) and the FTU-R
(RA-DTIMEds, RA-DSNRMds).
FTU-O: Configured through the DPU-MIB.
FTU-R: Configured through the DPU-MIB and communicated to the FTU-R during initialization
(O-MSG 1 message).

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