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5G NR RRC: UE measurements

prodevelopertutorial February 8, 2022

UE in RRC_CONNECTED, it will measure multiple beams of the cell to determine cell quality.

Then it will report the measurements to network, based on that, network can inform UE to perform handover.

There are 2 types of measurement reporting:
1. Periodic reporting
2. Event reporting.

Event reporting refers to the situation that meets the conditions specified in the protocol.

The measurement events mentioned above, described in 38.331 Section 5.4, include

A1 – Serving cell measurement result is better threshold

Entering condition:Ms – Hys > Thresh
Leaving condition:Ms + Hys < Thresh

A2 – Serving cell measurement result is worse threshold

Entering condition:Ms + Hys < Thresh
Leaving condition:Ms – Hys > Thresh

A3 – The neighbor cell measurement result is higher than the serving cell measurement result + offset

Entering condition:Mn + Ofn + Ocn – Hys > Mp + Ofp + Ocp + Off
Leaving condition:Mn + Ofn + Ocn + Hys < Mp + Ofp + Ocp + Off

A4 – Neighbor measurement result is above threshold

Entering condition:Mn + Ofn + Ocn – Hys > Thresh
Leaving condition:Mn + Ofn + Ocn + Hys < Thresh

A5 – The serving cell measurement is below the threshold and the neighbor measurement is above the threshold

Entering condition 1:Mp + Hys < Thresh1
Entering condition 2:Mn + Ofn + Ocn – Hys > Thresh2
Leaving condition 1:Mp – Hys > Thresh1
Leaving condition 2:Mn + Ofn + Ocn + Hys < Thresh2

A6 – The measurement result of the neighbor cell is higher than the measurement result of the Scell + offset

Entering condition:Mn + Ocn – Hys > Ms + Ocs + Off
Leaving condition:Mn + Ocn + Hys < Ms + Ocs + Off

B1 – Inter-system cell measurement result is higher than the threshold

Entering condition:Mn + Ofn + Ocn – Hys > Thresh
Leaving condition:Mn + Ofn + Ocn + Hys < Thresh

B2 – Inter-system cell measurement result is higher than the threshold, SPcell measurement result is lower than the threshold

Entering condition 1:Mp + Hys < Thresh1
Entering condition 2:Mn + Ofn + Ocn – Hys > Thresh2
Leaving condition 1:Mp – Hys > Thresh1
Leaving condition 2:Mn + Ofn + Ocn + Hys < Thresh2

Source TS 38.331

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