8.9 Downlink compressed mode

25.1013GPPRelease 17TSUser Equipment (UE) radio transmission and reception (FDD)

Downlink compressed mode is used to create gaps in the downlink transmission, to allow the UE to make measurements on other frequencies.

The requirements in this subclause were derived with the assumption that the UTRAN responds immediately to the uplink TPC commands by adjusting the power of the first pilot field of the DL DPCCH that commences after end of the received TPC command.

8.9.1 Single link performance

The receiver single link performance of the Dedicated Traffic Channel (DCH) in compressed mode is determined by the Block Error Ratio (BLER) and transmitted DPCH_Ec/Ior power ratio in the downlink.

The compressed mode parameters are given in clause A.5.

8.9.1.1 Minimum requirements

For the parameters specified in Table 8.35 the downlink power ratio measured values, which are averaged over one slot, shall be below the specified value in Table 8.36 more than 90% of the time. The measured quality on DTCH shall be as required in Table 8.36.

Downlink power control is ON during the test. Uplink TPC commands shall be error free.

Table 8.35: Test parameter for downlink compressed mode

Parameter		Unit		Test 1		Test 2
Delta SIR1		dB		0		3
Delta SIR after1		dB		0		3
Delta SIR2		dB		0		0
Delta SIR after2		dB		0		0
Compressed mode patterns		–		Set 2 in table A.21 in clause A.5 of TS 25.101		Set 1 in table A.21 in clause A.5 of TS 25.101
		dB		9
		dBm/3.84 MHz		-60
Information Data Rate		kbps		12.2
Propagation condition				Case 3		Case 2
Target quality value on DTCH		BLER		0.01
Maximum_DL_Power		dB		7
Minimum_DL_Power		dB		-18
DL Power Control step size, TPC		dB		1
Limited Power Increase		–		"Not used"

Table 8.36: Requirements in downlink compressed mode

Parameter	Unit	Test 1	Test 2
	dB	-13.7	No requirements
Measured quality of compressed and recovery frames	BLER	No requirements	<0.001
Measured quality on DTCH	BLER	0.01 ± 30 %