DECT-NR+, the first non-cellular 5G protocols is a cluster tree mesh operating in the DECT frequencies. It is an emerging wireless technology, promoted mainly by Wirepas and Nordic Semiconductors. This post focused on the DECT-NR+ mobility process

The standard is published via ETSI, and is currently v1.0.

The following flowchart illustrates the DECT-NR+ mobility process, but before it is explained we need to first elaborate on some terminology.

Types of nodes

DECT-NR+ defines radio devices which can be in FT, PT, or FT PT simultaneously.

PT Mode: The node acts as a client on the network, and has no other nodes connected to it (other than the upstream node)

FT Mode: The node is acting as a router and has PT nodes connected to it

FT, PT Mode: The node is acting as a router, but also a client to another router.

Cluster Beacons

There are two types of beacons that exist in DECT-NR+, Cluster and Network beacons. Network beacons are global to the network, and cluster beacons are localised to a FT node

RSSI Measurements

There are two types of RSSI measurements performed, RSSI-1 and RSSI-2.

RSSI-1: Is performed before the signal is demodulated. It is the physical signal coming into the network card.

RSSI-2: Is measured after the signal is demodulated.

DECT-NR+ Mobility Flowchart

The following flowchart illustrates the process.

The RSSI-2 measurement is based off either the network or the cluster beacon. A counter is decreased if the beacon has a demodulated signal strength greater than that of the currently associated node.

When the counter reaches to 0, association will occur – if the new radio is accepting associations.

DECT-NR+ Mobility flow chart

What about other technologies?

Want more information about 5G? Read more of our articles by visiting our 5G category. DECT-NR+ is an open standard managed via ETSI and supported by the DECT Forum

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