Page 828 - 5G Basics - Core Network Aspects

2 Transport aspects

Table 11-16 – Subcarrier parameter field format for OLR type 3
with complex relative gain compensation factors

Bit Length (bits) Parameter Format
3-0 4 bi (Notes 1 and 2) Unsigned integer
6-4 3 Exponent of ri (Notes 1 and 2) E3/4
16-7 10 Mantissa of imaginary part of ri (Notes 1 M10(1Q9) signed
and 2)
26-17 10 Mantissa of real part of ri (Notes 1 and 2) M10(1Q9) signed
27 1 Reserved by ITU-T Bit shall be set to 0
NOTE 1 – The values of b i and r i for subcarriers that are in the specified range but not part of the MEDLEY set shall be included.
They shall be set to zero by the transmitter and ignored by the receiver.
NOTE 2 – The values of b i and r i shall follow each other in ascending order of subcarrier index (not re-ordered).

Packing of the subcarrier parameter field into bytes shall be as shown in Table 11-17. Bytes of the
subcarrier parameter field shall be transmitted in the order of increasing indices, i.e., byte k is the first
transmitted byte.

Table 11-17 – Packing of the subcarrier field into bytes for OLR type 3
with complex relative gain compensation factors

Byte MSB LSB
k Mantissa of imag ri [0] Exponent of ri [2:0] bi [3:0]
k+1 Mantissa of imag ri [8:1]
k+2 Mantissa of real ri [6:0] Mantissa of imag ri [9]
k+3 00002 02 Mantissa of real ri [9:7]

The valid range of ri values expressed in dB is –18 dB < 20 × log10(abs(ri)) < +18 dB,
where abs(x) is the modulus of a complex value x. The real and imaginary part of the gain ri shall both be
formatted as M10(1Q9) E3/4 signed, with a common exponent.
A special value is ri = 0, which is coded with a mantissa=0 and exponent=0 for both real and imaginary part,
and shall be accompanied with bi = 0.

For OLR request type 4, each subcarrier parameter field shall be formatted as shown in Table 11-18.

Table 11-18 – Subcarrier parameter field format for OLR type 4

Bit numbers Length (bits) Parameter Format

3-0 4 bi Unsigned integer
15-4 12 Subcarrier index i Unsigned integer
Packing of the subcarrier parameter field into bytes shall be as shown in Table 11-18.1. Bytes of the
subcarrier parameter field shall be transmitted in the order of increasing indices, i.e., byte k is the first
transmitted byte.

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