Page 827 - 5G Basics - Core Network Aspects

Transport aspects 2

Table 11-13 – Packing of the subcarrier field into bytes for OLR type 2

Byte MSB LSB

k gi [3:0] bi [3:0]
k+1 gi [11:4]
k+2 index_i [7:0]
k+3 00002 index_i [11:8]

Each gi value shall be represented as an unsigned 12-bit fixed-point quantity with format 12(1Q11). For
example, a gi with binary representation (MSB listed first) 0.010000000002 would correspond to a gain of
0.25, so that the power of that subcarrier would be 12.04 dB lower than it was during MEDLEY. Valid values
are defined in clause 10.2.1.5.2.
For OLR commands of OLR request type 3 (TIGA) with real relative gain compensation factors, each
subcarrier parameter field shall be formatted as shown in Table 11-14.

Table 11-14 – Subcarrier parameter field format for OLR type 3 with
real relative gain compensation factors

Bit Length (bits) Parameter (Notes 1 and 2) Format
3-0 4 bi Unsigned integer
6-4 3 Exponent of ri E3/4

15-7 9 Mantissa of ri M9(0Q9) unsigned
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).

One subcarrier parameter field shall be mapped into two bytes as shown in Table 11-15. 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 11-15 – Packing of subcarrier fields into bytes for OLR type 3
with real relative gain compensation factors

Byte MSB LSB
k Mantissa of ri [0] Exponent of ri [2:0] bi [3:0]
k+1 Mantissa of ri [8:1]

The gain ri shall be formatted as floating point 12 M9(0Q9) E3/4 unsigned.
The valid range of ri values expressed in dB is -18 dB < 20 × log10 (ri) < +18 dB
A special value is ri = 0, which is coded with a mantissa=0 and exponent=0, and shall be accompanied with
bi = 0.
For OLR commands of OLR request type 3 (TIGA) with complex relative gain compensation factors, each
subcarrier parameter field shall be formatted as shown in Table 11-16.

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