what's blocking signals?

Following is a description of a DCS-1800 specification. But I don't know what's the blocking signals. Can anyone tell me?

3.4 From DCS Standard to Receiver Specifications
The DCS-1800 standard [ETSI] specifies the minimum reception quality that must be guaranteed under certain ?loading? conditions, like e.g. adjacent interference, blocking signals, low input powers etc.

Hello,

I think that the blocking signal refers to the blocking performing test case in the ETSI rec. Therefore, it should be a non modulated CW wave, as far I remember.
Hope this helps.

RFCMOS

Blocking tests verify correct receiver operation in the presence of out-of-channel signals and monitor the receivers' susceptibility to internally generated spurious responses.

In GSM there are three key test that define the receiver performance:
-spurious immunity (using an un-modulated interferer signal)
-adjacent channel selectivity (using a modulated interferer signal)
-intermodulation immunity (using one modulated and one un-modulated signal)

I noticed that my refrigerator was blocking signals, so I moved the phone!

Actually the fridge is not the main blocker...but the beer inside (in big quantities) could create problems receiving calls.

Yes, beer can cause a major blockage in reading usable signals. That is why I only use a good quality Scotch Whiskey, such as a Glenmorangie. The test signals seem much clearer that way. I also keep a jug of Woodford's Bourbon in the lab--just for test emergencies.