mMTC
Massive Machine-Type Communications: a 5G service category designed for connecting a very large number of low-power IoT devices with small, infrequent data transmissions.
mMTC flips the usual design priorities on their head. Instead of chasing speed or low latency, the goal is to support a huge number of devices — think tens of thousands per square kilometre — that each send tiny amounts of data, infrequently, while sipping power so a battery can last years. Smart meters, agricultural sensors, asset trackers, environmental monitors: that whole world.
The constraints reshape the radio design. These devices need deep coverage (often buried in basements or out in fields), so the technologies built for this — NB-IoT and LTE-M in the LTE era, carried forward and refined for 5G — use narrow bandwidths, heavy repetition for range, and aggressive sleep modes like PSM and eDRX to stretch battery life. You're not optimising for throughput at all here; you're optimising for density, reach, cost per module, and the years a coin cell has to last.
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