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1 1 See examples at https://www.ericsson.com/en/mobility-report/mobility-visualizer.

2 2 The interested reader may refer to [9, 2-27] for a thorough discussion on LTE-M evolution, which is out of the scope of this book.

3 3. One more cellular IoT standard is the extended coverage GSM IoT (EC-GSM-IoT), which is optimized to harness the already available GSM infrastructure deployed in previous generations, thus operating in-band with GSM [30].

4 4. For further details on URLLC please refer to [31, 32].

5 5. A detailed account of the historical background and foundations of this technique can be found in [72].

6 6. We coined the term massive WET already in 2019 in a pre-print version of [78].