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5GNRFR2Beam ManagementBeam Correspondence

Beam Correspondence in 5G NR FR2

WirelessBrew Team
July 20, 2024
3 min read
  • What is Beam Correspondence?
  • Conditions for Beam Correspondence
  • Beam Correspondence in 5G-NR
  • UE Capability Indication
  • Capability Parameters
  • Beam Correspondence for Carrier Aggregation (CA)
  • References

What is Beam Correspondence?

Beam Correspondence is a term used when the beams selected for downlink (DL) transmission and reception can also be used for uplink (UL) transmission and reception.

  • This means DL and UL transmissions will happen on the same beam.
  • It is one of the fundamental elements of the Beam Management Concept.

3GPP defines Beam Correspondence as the ability of the UE to select a suitable beam for UL transmission based on DL measurements with or without relying on UL beam sweeping.

  • The beam correspondence requirement is satisfied assuming the presence of both SSB and CSI-RS signals.
  • Type D QCL is maintained between SSB and CSI-RS.

Conditions for Beam Correspondence

Tx/Rx beam correspondence at gNB holds if at least one of the following is satisfied:

  • gNB is able to determine a gNB Rx beam for the uplink reception based on UE’s downlink measurement on gNB’s one or more Tx beams.
  • gNB is able to determine a gNB Tx beam for the downlink transmission based on gNB’s uplink measurement on gNB’s one or more Rx beams.

Tx/Rx beam correspondence at UE holds if at least one of the following is satisfied:

  • UE is able to determine a UE Tx beam for the uplink transmission based on UE’s downlink measurement on UE’s one or more Rx beams.
  • UE is able to determine a UE Rx beam for the downlink reception based on gNB’s indication based on uplink measurement on UE’s one or more Tx beams.

Beam Correspondence in 5G-NR

UE Capability Indication

Does the UE need to indicate to the network if Beam Correspondence is supported?

Yes, the UE indicates to the network in the UE Capability Information message by including the parameter beamCorrespondenceWithoutUL-BeamSweeping.

Capability Parameters

ParameterExplanation
beamCorrespondenceWithoutUL-BeamSweepingIndicates whether UE supports FR2 beam correspondence. Applicable to FR2 only. Set per band capability. Bit = 1 (Supported): UE fulfills requirement without UL beam sweeping. Bit = 0: UE does not support correspondence and supports Uplink beam sweeping. Mandatory parameter in UE Capability Information.
beamCorrespondenceCAIndicates whether a UE configured with Carrier Aggregation (CA) supports the same beam correspondence across all Component Carriers (CCs).
uplinkBeamManagementDefines support of beam management for UL. Includes: Max number of SRS resources per SRS resource set. Max number of SRS resource sets. If beamCorrespondenceWithoutUL-BeamSweeping is 0, the UE shall set this field to 1.

Beam Correspondence for Carrier Aggregation (CA)

For intra-band CA in FR2:

  • The same beam correspondence relationship for beam management is supported across CCs in Rel-15.
  • No specific requirement is specified.
  • Beam correspondence performance for intra-band CA is fulfilled if the requirements are met for the non-CA cases.

References

  • 3GPP TS 38.101-2: NR; User Equipment (UE) radio transmission and reception.
  • 3GPP TS 38.306: User Equipment (UE) radio access capabilities.
WirelessBrew Team
Written by

WirelessBrew Team

Technical expert at WirelessBrew, specializing in 5G NR, LTE, and wireless system optimization. Committed to providing accurate, 3GPP-compliant engineering tools.

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