This can already be done with ordinary WiFI hardware. Here is one of multiple papers about it:
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5713643/
How much easier will "device free localization and identification" be with 5G's higher frequencies and beamforming antenna arrays?
Consider, why else would people be writing papers like these?
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6929065/
- https://www.researchgate.net/publication/337698696_WiFreeze_...
- https://www.5gitaly.eu/2018/wp-content/uploads/2019/01/5G-It...
- https://dl.acm.org/doi/10.5555/3324320.3324370
- https://ieeexplore.ieee.org/document/7947692
I don't like the way 5G is pitched to the public. It feels icky. All the marketing is like "this will change the world and bring internet to rural areas plus you'll be able to watch netflix on your phone omg can you believe that!"
But in a few years they'll suddenly be saying "Awe golly shucks whaddya know, who knew 5G radios can also be used to spy on your aging parents breathing habits... how convenient! Now we can send an ambulance before you even call!" etc.