7.5 Adjacent Channel Selectivity (ACS)

25.1023GPPRelease 17TSUser Equipment (UE) radio transmission and reception (TDD)

Adjacent Channel Selectivity is a measure of a receiver’s ability to receive a wanted signal at its assigned channel frequency in the presence of adjacent channel signal at a given frequency offset from the centre frequency of the assigned channel. ACS is the ratio of the receive filter attenuation on the assigned channel frequency to the receiver filter attenuation on the adjacent channel(s).

7.5.1 Minimum Requirement

7.5.1.1 3.84 Mcps TDD Option

The ACS shall be better than the value indicated in Table 7.4 for the test parameters specified in Table 7.5 where for non-IMB operation the BER shall not exceed 0.001 and for IMB operation, the BLER shall not exceed 0.01.

Table 7.4: Adjacent Channel Selectivity (3.84 Mcps TDD Option)

Power Class	Unit	ACS
2	dB	33
3	dB	33
Note: For the case of an MBSFN-only UE, no power class may be applicable. In this case the same ACS requirement of 33dB shall apply.

Table 7.5: Test parameters for Adjacent Channel Selectivity (3.84 Mcps TDD Option)

Parameter	Unit	Level
	dB	0 *
Îor	dBm/3.84 MHz	-91
Ioac mean power (modulated)	dBm	-52
Fuw offset	MHz	+5 or -5
NOTE *: Subtract 0.77dB when using the IMB DL reference measurement channel. For IMB the term DPCH_Ec refers to the sum of the energy of the physical channels comprising the IMB DL reference measurement channel.

7.5.1.2 1.28 Mcps TDD Option

The UE shall fulfil the minimum requirement specified in Table 7.4A for all values of an adjacent channel interferer up to –25 dBm.

However it is not possible to directly measure the ACS, instead the lower and upper range of test parameters are chosen in Table 7.5A where the BER shall not exceed 0.001.

Table7.4A: Adjacent Channel Selectivity (1.28 Mcps TDD Option)

Power Class	Unit	ACS
2	dB	33
3	dB	33
Note: For the case of an MBSFN-only UE, no power class may be applicable. In this case the same ACS requirement of 33dB shall apply.

Table 7.5A: Test parameters for Adjacent Channel Selectivity (1.28 Mcps TDD Option)

Parameter	Unit	Case 1	Case 2
	dB	0	0
Îor	dBm/1.28MHz	-91	-62
Ioac mean power (modulated)	dBm	-54	-25
Fuw offset	MHz	+1.6 or -1.6	+1.6 or -1.6

7.5.1.3 7.68 Mcps TDD Option

The ACS shall be better than the value indicated in Table 7.4B for the test parameters specified in 7.5B where the BER shall not exceed 0.001

Table 7.4B: Adjacent Channel Selectivity (7.68 Mcps TDD Option)

Power Class	Unit	ACS
2	dB	33
3	dB	33
Note: For the case of an MBSFN-only UE, no power class may be applicable. In this case the same ACS requirement of 33dB shall apply.

Table 7.5B: Test parameters for Adjacent Channel Selectivity (7.68 Mcps TDD Option)

Parameter	Unit	Level
	dB	0
Îor	dBm/7.68 MHz	-91
Ioac mean power (modulated)	dBm	-52
Fuw offset (3.84 Mcps Modulated)	MHz	+7.5 or -7.5
Fuw offset (7.68 Mcps Modulated)	MHz	+10 or -10

7.5.2 Additional requirement of multi-carrier reception for 1.28Mcps TDD Option

The ACS shall be better than the value indicated in table 7.4A for the test parameters specified in table 7.5AA where the BLER measured on each carrier shall not exceed 0.1.

Table 7.5AA: Test parameters for Adjacent Channel Selectivity of multi-carrier reception

Parameter	Unit	Case 1	Case 2
	dB	0	0
Îor	dBm/1.28MHz	-87.8	-58.8
Ioac mean power (modulated)	dBm	-54	-25
Fuw offset(Note)	MHz	+1.6 or -1.6	+1.6 or -1.6
Note: Negative offsets refer to the assigned channel frequency of the lowest carrier frequency used and positive offsets refer to the assigned channel frequency of the highest carrier frequency used.