5G Radio Access Network

#5G Radio Access Network has two major challenges:
- best usage of the assigned spectrum (including millimeter bands)
- support of new use cases (MMTC & URLLC — see below)
This led to the definition of a new #wireless access called NR (New Radio).

To satisfy Enhanced mobile broadband requirements there are concepts like:
- wideband carries (up to 100 MHz in mid-frequencies and 400MHz in millimeter bands)
- carrier aggregation (using more than one carrier)
- Massive MIMO (using more than one transceiver both in BT and device)

When supporting Ultra-reliable low latency #communication (URLLC) following features are used:
- Flexible numerology — various symbol duration for different subcarriers options
- Preemptive scheduling — slot takeover for high-priority data

Massive machine type communication (MMTC) require quite a different characteristic of the network including:
- low power communication to enable device working for over 10 years on battery
- high density of devices in a network (up to 1 mln/1km2)
- extensive coverage to enable propagation in places like basements or factories.
More about MMTC and other types of communication features later.