Identification of an alpine blueberry type
Possibly Vaccinium gaultherioides (sometimes considered a subspecies of Vaccinium uliginosum), which are present throughout the Alps.

For example, see InfoFlora*:



 Vaccinium gaultherioides Bigelow, © Konrad Lauber – Flora Helvetica – 2012 Haupt Bern 

You can see the prevelance of this species throughout the Swiss alps in the below range map (also from InfoFlora):



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* the national data center for the Swiss flora 

I don't know the flora of the Alps personally and I feel you post lacks enough detail for me to confidently pick and choose among many Vaccinium candidates. From those I've examined, this species seems most visually similar to yours.