A9.1 BLOCKING LEVELS IN 3GPP AND ETSI SPECIFICATIONS

SINR, ACS, blocking levels or intermodulation thresholds are defined by 3GPP/ETSI for a given desensitisation. These values are used for compliance testing to the specifications.

As an example, in GSM, tests related to blocking are performed with a desensitisation of 20 dB for the two first adjacent channels, and of 3 dB for the following channels. In UMTS and LTE, the following table applies.

Table 69: Desensitisation considered for testing ACS and blocking levels

	1^st adjacent 5 MHz block	Following adjacent 5 MHz blocks	Adjacent narrowband interferer
UMTS BS	6 dB	6 dB	6 dB
LTE BS	6 dB	6 dB	6 dB
UMTS UE	14 dB	3 dB	10 dB
LTE UE	14 dB	6 to 9 dB[1]	13 to 16 dB⁶

It can be noted that the desensitisation considered for testing varies with the frequency offset, while the network is designed for a specific value. In section 7.5.1 of 3GPP TS 25 101 [5] and TS 36 101 [1] related to the UE, the desensitisation value is explicitly mentioned as a testing parameter.

[1] Depending on the LTE channel width