SINR, ACS, blocking levels or intermodulation thresholds are defined by 3GPP/ETSI for a given desensitization. These values are used for compliance testing to the specifications.
As an example, in GSM, tests related to blocking are performed with a desensitization of 20 dB for the two first adjacent channels, and of 3 dB for the following ones. In UMTS and LTE, the following table applies.
Table 68: Desensitization considered for testing ACS and blocking levels
| 1st adjacent | Following adjacent | Adjacent narrowband |
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 desensitization considered for testing varies upon the frequency offset, while the network is designed for a unique desensitization. Moreover, in section 7.5.1 of ETSI TS 125 101 and TS 136 101 related to the UE, the desensitization value is explicitly mentioned as a testing parameter.