Page 960 - 5G Basics - Core Network Aspects

2 Transport aspects

Table 12-52 – O-PMD message

Field Field name Format

6 Tone ordering table 3 × ceiling(NSCus/2) bytes coded as follows:
• Bits 0-11: t2n–1
• Bits 12-23: t2n
7 Initialization status One byte
8 Upstream gi table 3 × ceiling(NSCus/2) bytes

9 Upstream FRA sub-bands Sub-band descriptor
Field 1 "Message descriptor" is a unique one-byte code (0A16) that identifies the message. See Table 12-7
for a complete list of codes.
Field 2 "Bit-loading table for data symbol during NOI" contains the bi values for every subcarrier in
MEDLEYus. The bi shall indicate the number of bits to be mapped by the FTU-R to the subcarrier i.

The bi shall only be defined for subcarriers from the MEDLEYus set (as indicated in O-PRM message), and
shall be sent in ascending order of subcarrier index i.

Each bi value shall be represented as an unsigned 4-bit integer with valid range from zero to 12. The four
least significant bits of the first byte of this field represent the bit loading of the first subcarrier from the
MEDLEYus set. The four most significant bits of the first byte of this field represent the bit loading of the
second subcarrier from the MEDLEYus set. The four least significant bits of the second byte of this field
represent the bit loading of the third subcarrier from the MEDLEYus set, etc.

Field 3 "Number of RMC US subcarriers (NSCRus)" indicates the number of subcarriers assigned for
upstream RMC symbol represented as an unsigned integer. The valid range is from 1 to 512 (020016).

Field 4 "Upstream RMC tone set (RTSus)" indicates the indices of the subcarriers used to encode the RMC in
the upstream direction. Each subcarrier index shall be represented as a 12-bit value. Pairs of subcarrier
indices shall be mapped to a field of three bytes. For example, if the value of the nth field is 40020016,
rsc2n−1 = 20016 = 512 and rsc2n = 40016 = 1 024. If the number of subcarriers in the RTSus set is odd, the
last 12 bits of the field shall be set to ZERO (and ignored by the receiver). The first encoded value shall
correspond to the lowest subcarrier used to encode the RMC. The remaining indices shall be sent in
increasing frequency order. The subcarriers for RTSus shall be selected from the MEDLEYus set.
Field 5 "Bit-loading table for RMC US subcarriers" contains the bi values for every subcarrier in upstream
RMC subcarrier set presented in field 3. The bi shall indicate the number of bits to be mapped by the FTU-R
to the subcarrier i. The bi values shall be sent in ascending order of subcarrier index i. Each bi value shall be
represented as an unsigned 4-bit integer with valid values of 0 and from 2 to 6.

Field 6 "Tone ordering table" contains the tone ordering table t for the upstream direction. The tone
ordering table contains the order in which the subcarriers shall be assigned bits in the upstream direction.
The table shall include all subcarriers of the MEDLEYus set and only these subcarriers. Each subcarrier index
shall be represented as a 12-bit value. Pairs of subcarrier indices shall be mapped to a field of three bytes.
For example, if the value of the nth field is 40020016, t2n−1 = 20016 = 512 and t2n = 40016 = 1 024. If the
number of subcarriers in the MEDLEYus set is odd, the last 12 bits of the field shall be set to ZERO (and
ignored by the receiver). The value of the first index sent shall be equal to the index of the first entry in the
tone ordering table (t1, see clause 10.2.1.2). The remaining indices shall be sent in increasing order of the
tone ordering table t entries (t2, t3, ... tNSCus).

Field 7 "Initialization status":
If, within the constraints of the channel initialization policies defined in clause 12.3.7, the receiver is unable
to select a set of configuration parameters, the receiver shall reply with an "Initialization success/failure
code" indicating the initialization failure cause.

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