8 Out of band gain

25.1163GPPRelease 17TSUTRA repeater radio transmission and reception (LCR TDD)

Out of band gain refers to the gain of the repeater outside the pass band.

8.1 Minimum requirement

The intended use of a repeater in a system is to amplify the in band signals and not to amplify the out of band emission of the donor base station.

In the intended application of the repeater, the out of band gain is less than the donor coupling loss.

The repeater minimum donor coupling loss shall be declared by the manufacturer. This is this the minimum required attenuation between the donor BS and the repeater for proper repeater operation.

The gain outside the pass band shall not exceed the maximum level specified in table 8.1, where:

– f_offset is the distance from the centre frequency of the first or last channel within the pass band.

Table 8.1: Out of band gain limits 1

Frequency offset from the carrier frequency, f_offset	Maximum gain
1,0  f_offset < 1,8 MHz	60 dB
1,8  f_offset < 5,8 MHz	45 dB
5,8  f_offset < 10,8 MHz	45 dB
10,8 MHz  f_offset	35 dB

For 10,8 MHz  f_offset the out of band gain shall not exceed the maximum gain of table 8.2 or the maximum gain stated in table 8.1 whichever is lower.

Table 8.2: Out of band gain limits 2

Repeater maximum output power as in 9.1.1.1	Maximum gain
P < 31 dBm	Out of band gain  minimum donor coupling loss
31 dBm  P < 43 dBm	Out of band gain  minimum donor coupling loss
P  43 dBm	Out of band gain  minimum donor coupling loss – (P-43dBm)
NOTE 1: The out of band gain is considered with 10,8 MHz  f_offset