6.4 Output power dynamics

25.1413GPPBase Station (BS) conformance testing (FDD)Release 17TS

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

Power control is used to limit the interference level. The BS transmitter uses a quality-based power control on the downlink. The physical channels for the following test(s) shall be set-up according to clause 6.1.1.2.

6.4.1 Inner loop power control

Inner loop power control in the downlink is the ability of the BS transmitter to adjust the code domain power of a code channel in accordance with the corresponding TPC symbols received in the uplink.

6.4.2 Power control steps

The power control step is the required step change in the code domain power of a code channel in response to the corresponding power control command. The combined output power change is the required total change in the DL transmitter output power of a code channel in response to multiple consecutive power control commands corresponding to that code channel.

6.4.2.1 Definition and applicability

Inner loop power control in the downlink is the ability of the BS transmitter to adjust the transmitter output power of a code channel in accordance with the corresponding TPC symbols received in the uplink.

The power control step is the required step change in the DL transmitter output power of a code channel in response to the corresponding power control command. The combined output power change is the required total change in the DL transmitter output power of a code channel in response to multiple consecutive power control commands corresponding to that code channel.

6.4.2.2 Minimum Requirement

The minimum requirement is in TS 25.104 [1] clause 6.4.1.1.1.

Table 6.9: (void)

Table 6.10: (void)

6.4.2.3 Test purpose

To verify those requirements for the power control step size and response are met as specified in clause 6.4.2.2.

6.4.2.4 Method of test

6.4.2.4.1 Initial conditions

Test environment: normal; see clause 4.4.1.

RF channels to be tested: B, M and T; see clause 4.8

1) Connect the suitable measurement equipment to the BS antenna connector as shown in annex B.

2) Set the BS to transmit a signal in accordance to TM2, clause 6.1.1.2, at manufacturer’s declared rated output power, Prated,c.

The DPCH intended for power control is on channel 120 starting at -3 dB.

3) Establish downlink power control with parameters as specified in table 6.11.

Table 6.11

Parameter	Level/status	Unit
UL signal mean power	Ref.sens + 10 dB	dBm
Data sequence	PN9

6.4.2.4.2 Procedure

1) Set and send alternating TPC bits from the UE simulator or UL signal generator.

2) Measure mean power level of the code under the test each time TPC command is transmitted. All steps within power control dynamic range declared by manufacturer shall be measured. Use the code domain power measurement method defined in annex E.

3) Measure the 10 highest and the 10 lowest power step levels within the power control dynamic range declared by manufacturer by sending 10 consecutive equal commands as described table 6.10.

In addition, for a multi-band capable BS, the following step shall apply:

4) For multi-band capable BS and single band tests, repeat the steps above per involved band where single carrier test models shall apply with no carrier activated in the other band. For multi-band capable BS with separate antenna connector, the antenna connector not being under test shall be terminated.

6.4.2.5 Test requirement

a) BS shall fulfil step size requirement shown in Table 6.12 for all power control steps declared by manufacture as specified in clause 6.4.2.2.

b) For all measured Up/Down cycles, the difference of code domain power between before and after 10 equal commands (Up and Down), derived in step (3), shall not exceed the prescribed tolerance in table 6.13.

Table 6.12: Transmitter power control step tolerance

Power control commands in the downlink	Transmitter power control step tolerance
	2 dB step size		1.5 dB step size		1 dB step size		0.5 dB step size
	Lower	Upper	Lower	Upper	Lower	Upper	Lower	Upper
Up(TPC command "1")	+0.9 dB	+3.1 dB	+0.65 dB	+2.35 dB	+0.4 dB	+1.6 dB	+0.15 dB	+0.85 dB
Down(TPC command "0")	-0.9 dB	-3.1 dB	-0.65 dB	-2.35 dB	-0.4 dB	-1.6 dB	-0.15 dB	-0.85 dB

Table 6.13: Transmitter aggregated power control step range

Power control commands in the downlink	Transmitter aggregated power control step range after 10 consecutive equal commands (up or down)
	2 dB step size		1.5 dB step size		1 dB step size		0.5 dB step size
	Lower	Upper	Lower	Upper	Lower	Upper	Lower	Upper
Up(TPC command "1")	+15.9 dB	+24.1 dB	+11.9 dB	+18.1 dB	+7.9 dB	+12.1 dB	+3.9 dB	+6.1 dB
Down(TPC command "0")	-15.9 dB	-24.1 dB	-11.9 dB	-18.1 dB	-7.9 dB	-12.1 dB	-3.9 dB	-6.1 dB

NOTE: If the above Test Requirement differs from the Minimum Requirement then the Test Tolerance applied for this test is non-zero. The Test Tolerance for this test is defined in clause 4.2 and the explanation of how the Minimum Requirement has been relaxed by the Test Tolerance is given in Annex F.

6.4.3 Power control dynamic range

6.4.3.1 Definition and applicability

The power control dynamic range is the difference between the maximum and the minimum code domain power of a code channel for a specified reference condition. Transmit modulation quality shall be maintained within the whole dynamic range as specified in TS 25.104 [1] clause 6.8.

6.4.3.2 Minimum Requirement

The minimum requirement is in TS 25.104 [1] clause 6.4.2.1.

6.4.3.3 Test purpose

To verify that the minimum power control dynamic range is met as specified by the minimum requirement.

6.4.3.4 Method of test

6.4.3.4.1 Initial conditions

Test environment: normal; see clause 4.4.1.

RF channels to be tested: B, M and T; see clause 4.8Connect the measurement equipment to the BS antenna connector as shown in annex B.

6.4.3.4.2 Procedure

1) Set the BS to transmit a signal in accordance to TM2, clause 6.1.1.2, at manufacturers declared rated output power, Prated,c.

2) Using TM2,set the code domain power of the DPCH under test to Prated,c – 3 dB. Power levels for other code channels may be adjusted if necessary.

3) Measure the code domain power of the code channel under test. Use the code domain power measurement method defined in annex E.

4) Set the code domain power of the DPCH under test to Prated,c – 28 dB by means determined by the manufacturer. The power levels for the other code channels used in step 2 shall remain unchanged (the overall output power will drop by approximately 3 dB).

5) Measure the code domain power of the code channel under test.

In addition, for a multi-band capable BS, the following step shall apply:

6) For multi-band capable BS and single band tests, repeat the steps above per involved band where single carrier test models shall apply with no carrier activated in the other band. For multi-band capable BS with separate antenna connector, the antenna connector not being under test shall be terminated.

6.4.3.5 Test requirement

Downlink (DL) power control dynamic range:

– maximum code domain power: BS maximum output power -4.1 dB or greater;

– minimum code domain power: BS maximum output power -26.9 dB or less.

6.4.4 Total power dynamic range

6.4.4.1 Definition and applicability

The downlink total power dynamic range is the difference between the maximum and the minimum output power per carrier for a specified reference condition.

6.4.4.2 Minimum Requirement

The minimum requirement is in TS 25.104 [1] clause 6.4.3.1.

6.4.4.3 Test purpose

To verify that the total power dynamic range is met as specified by the minimum requirement. The test is to ensure that the total output power can be reduced while still transmitting a single code. This is to ensure that the interference to neighbouring cells is reduced.

6.4.4.4 Method of test

6.4.4.4.1 Initial Conditions

Test environment: normal; see clause 4.4.1.

RF channels to be tested: B, M and T; see clause 4.8

Base Station RF Bandwidth positions to be tested for multi-carrier: B_RFBW, M_RFBW and T_RFBW in single band operation; see subclause 4.8.1.

Refer to annex B for a functional block diagram of the test set-up.

1) Connect the base station antenna connector to the measurement equipment.

6.4.4.4.2 Procedure

The downlink total dynamic range is computed as the difference of the maximum carrier output power, measured as defined in step 2 in clause 6.2.1.4.2 and the carrier power measured at step 3 of the Error Vector Magnitude test, as described in clause 6.7.1.4.2.

In addition, for a multi-band capable BS, the following step shall apply:

1) For multi-band capable BS and single band tests, repeat the steps above per involved band where single carrier test models shall apply with no carrier activated in the other band. For multi-band capable BS with separate antenna connector, the antenna connector not being under test shall be terminated.

6.4.4.5 Test requirement

The downlink total power dynamic range shall be 17.7 dB or greater.

6.4.5 IPDL time mask

6.4.5.1 Definition and applicability

To support IPDL location method, the Node B shall interrupt all transmitted signals in the downlink (i.e. common and dedicated channels).

The IPDL time mask specifies the limits of the BS output power during these idle periods.

The requirement in this section shall apply to BS supporting IPDL. The requirement applies to all output powers within the total power dynamic range as specified in TS 25.104 [1] clause 6.4.3.

6.4.5.2 Minimum Requirement

The minimum requirement is in TS 25.104 [1] clause 6.4.5.1.

6.4.5.3 Test purpose

The test purpose is to verify the ability of the BS to temporarily reduce its output power below a specified value to improve time difference measurements made by UE for location services.

6.4.5.4 Method of test

6.4.5.4.1 Initial conditions

Test environment: normal; see clause 4.4.1.

RF channels to be tested: B, M and T; see clause 4.8.

1) Connect the power measuring equipment to the BS antenna connector.

2) Set the BS to transmit a signal in accordance to TM1, clause 6.1.1.1, at manufacturer’s declared rated output power, Prated,c.

3) Configure the BS to produce idle periods in continuous mode. The IPDL parameters as defined in TS 25.214 [12] shall have the following values:

IP_Spacing = 5

IP_Length = 10 CPICH symbols

Seed = 0

6.4.5.4.2 Procedure

1) Measure the mean power at the BS antenna connector over a period starting 27 chips after the beginning of the IPDL period and ending 27 chips before the expiration of the IPDL period.

In addition, for a multi-band capable BS, the following step shall apply:

2) For multi-band capable BS and single band tests, repeat the step above per involved band where single carrier test models shall apply with no carrier activated in the other band. For multi-band capable BS with separate antenna connector, the antenna connector not being under test shall be terminated.

6.4.5.5 Test Requirements

The mean power measured according to step (1) in clause 6.4.5.4.2 shall be equal to or less than

BS maximum output power – 34.3 dB.

6.4.6 Home base station output power for adjacent channel protection

6.4.6.1 Definition and applicability

The Home BS shall be capable of adjusting the transmitter output power to minimize the interference level on the adjacent channels licensed to other operators in the same geographical area while optimize the Home BS coverage. These requirements are only applicable to Home BS. The requirements in this clause are applicable for AWGN radio propagation conditions.

The output power, Pout, of the Home BS shall be as specified in Table 6.13A under the following input conditions:

– CPICH Êc, measured in dBm, is the code power of the Primary CPICH on one of the adjacent channels presented at the Home BS antenna connector for the CPICH received on the adjacent channels. If Tx diversity is applied on the Primary CPICH, CPICH Êc shall be the sum in [W] of the code powers of the Primary CPICH transmitted from each antenna.

– Ioh, measured in dBm, is the total received power density, including signals and interference but excluding the own Home BS signal, presented at the Home BS antenna connector on the Home BS operating channel.

In case that both adjacent channels are licensed to other operators, the most stringent requirement shall apply for Pout. In case the Home BS’s operating channel and both adjacent channels are licensed to the same operator, the requirements of this clause do not apply.

The input conditions defined for the requirements in this section are specified at the antenna connector of the Home BS. For Home BS receivers with diversity, the requirements apply to each antenna connector separately, with the other one(s) terminated or disabled .The requirements are otherwise unchanged. For Home BS(s) without measurement capability, a reference antenna with a gain of 0 dBi is assumed for converting these power levels into field strength requirements.

Table 6.13A: Home BS output power for adjacent operator channel protection

Input Conditions

Output power, Pout

(without transmit diversity or any MIMO mode)

Output power, Pout

(with transmit diversity or MIMO mode)

Output power, Pout

(with MIMO mode with four transmit antennas)

Ioh > CPICH Êc + 43 dB

and CPICH Êc ≥ -105dBm

≤ 10 dBm

≤ 7dBm

≤ 4dBm

Ioh ≤ CPICH Êc + 43 dB

and CPICH Êc ≥ -105dBm

≤ max(8 dBm, min(20 dBm, CPICH Êc + 100 dB))

≤ max(5 dBm, min(17 dBm, CPICH Êc + 97 dB))

≤ max (2 dBm, min(14 dBm, CPICH Êc + 94 dB))

NOTE 1: The Home BS transmitter output power specified in Table 6.13A assumes a Home BS reference antenna gain of 0 dBi, an target outage zone of 47dB around the Home BS for an UE on the adjacent channel, with an allowance of 2 dB for measurement errors, an ACIR of 33 dB, an adjacent channel UE CPICH Ec/Io target of -18 dB and the same CPICH Êc value at the adjacent channel UE as for the Home BS.

NOTE 2: For CPICH Êc < -105dBm, the requirement in section 6.2.1 applies.

6.4.6.2 Minimum Requirement

The minimum requirement is in TS 25.104 [1] clause 6.4.6.

6.4.6.3 Test purpose

The test purpose is to verify the capability of the Home BS to adjust the transmitter output power according to the input conditions, as specified in Table 6.13A, across the frequency range and under normal and extreme conditions for all transmitters in the BS.

6.4.6.4 Method of test

6.4.6.4.1 Initial conditions

Test environment: normal; see clause 4.4.1.

RF channels to be tested: M; see clause 4.8

In addition, on one UARFCN only, the test shall be performed under extreme power supply as defined in clause 4.4.4

NOTE: Tests under extreme power supply also test extreme temperature.

Signal generators delivering co-channel and adjacent channel interferers are switched off.

1) Set-up the equipment as shown as shown in Annex B.1.7.

2) The Home BS is configured such that the adjacent channel is known to belong to another operator.

6.4.6.4.2 Procedure

1) Connect the combined downlink interfering signals (referred to as point D in Figure B.7) to the dedicated measurement port (referred to as point 1 in Figure B.7) if available, otherwise connect to point 2.

2) Configure the signal generator for co-channel interference to transmit AWGN over a 3.84MHz bandwidth centred on RF channel M.

3) Configure the signal generator for adjacent channel DL signal to transmit TM1 at the centre frequency equal to RF channel M +5 MHz.

4) Switch on signal generators delivering co-channel and adjacent channel interferers, and adjust the ATT1 and ATT2 such that CPICH Êc = -80 dBm and Ioh = -50 dBm.

5) Trigger the Home BS power adjustment mechanism.

6) Set the Home BS to transmit a signal in accordance to TM1, clause 6.1.1.1

NOTE: The signal shall be transmitted with the maximum allowed output power.

7) Measure Home BS output power, Pout, and check it is below the required value according to the CPICH Êc and Ioh values determined in step 4.

8) Repeat steps 3) to 7) with the frequency in step 3 set to RF channel M -5 MHz.

9) Repeat steps 3) to 8) with different settings for ATT1 and ATT2 to arrive the CPICH Êc and Ioh pairs as specified in Table 6.13B.

Table 6.13B: CPICH Êc and Ioh pairs

Test Case	CPICH Êc (dBm)	Ioh (dBm)
2	-90	-60
3	-100	-70
4	-100	-50

6.4.6.5 Test Requirements

In normal operating conditions, the output power, Pout, of the Home BS shall be equal to or less than the value specified in Table 6.13A plus 2.7 dB.

In extreme operating conditions, the output power, Pout, of the Home BS shall be equal to or less than the value specified in Table 6.13A plus 3.2 dB.