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US-12628093-B2 - Power headroom report for a serving cell

US12628093B2US 12628093 B2US12628093 B2US 12628093B2US-12628093-B2

Abstract

Methods and apparatuses for PHR for a serving cell, wherein an active BWP of the serving cell is a dormant BWP. A UE sends a PHR to at least a network node to report PH of the serving cell; the network node receives the PHR from the UE to report PH of the serving cell and obtains PH value from the PHR for the serving cell. Herein at least one of the following is reported for the serving cell: 1) Type 1 PH; 2) Type 3 PH; 3) a designated field indicating whether the PH is Type 1 or Type 3; 4) a designated field indicating whether the serving cell is on a dormant BWP or non-dormant BWP.

Inventors

  • Jarkko Koskela
  • Samuli Turtinen
  • Chunli Wu
  • Tero Henttonen

Assignees

  • NOKIA TECHNOLOGIES OY

Dates

Publication Date
20260512
Application Date
20200520

Claims (12)

  1. 1 . A user equipment (UE) for a Power Headroom Report (PHR) for a serving cell, comprising: at least one processor; and at least one memory including computer program code; the at least one memory and the computer program code configured to, with the at least one processor, cause the UE at least to perform: triggering the PHR to a network node to report Power Headroom (PH) of the serving cell, wherein the PHR is triggered upon the following event: activation of the serving cell if a first Bandwidth Part (BWP) of the serving cell is not a dormant BWP and if the serving cell is a Secondary Cell (SCell) of a medium access control (MAC) entity, wherein the MAC entity is with configured uplink; and continuing downlink Reference Signal measurements without reporting to a network node until the PHR is triggered after the active BWP switches from a dormant to a non-dormant BWP or the active BWP on the serving cell switches from a non-dormant BWP to a dormant BWP.
  2. 2 . The UE of claim 1 , wherein the reported PH is indicated by one of the following: Type 1 PH; Type 3 PH; a designated field indicating whether the PH is Type 1 or Type 3; or a designated field indicating whether the serving cell is on a dormant BWP or non-dormant BWP.
  3. 3 . The UE of claim 1 , wherein the reported PH for the serving cell is Type 1 PH with a virtual field indicating a PUSCH reference format is used, or wherein the reported PH for the serving cell is Type 3 PH depending on whether there is a Sounding Reference Signal (SRS) transmission on the dormant BWP when the PHR is reported.
  4. 4 . The UE of claim 1 , wherein the PHR triggering is upon switching the active BWP from a dormant BWP to a non-dormant BWP if no PHR is reported for the serving cell when the active BWP is a dormant BWP.
  5. 5 . The UE of claim 1 , wherein the PHR triggering is upon activation of the serving cell when the active BWP of the serving cell is not a dormant BWP.
  6. 6 . The UE of claim 1 , wherein the triggering of the PHR is configured by the network node.
  7. 7 . The UE of claim 1 , wherein the triggering of the PHR is made on a per serving cell when the active BWP is a dormant BWP.
  8. 8 . A system for a Power Headroom Report (PHR) for a serving cell, comprising a user equipment (UE) and at least a network node, wherein an active Bandwidth Part (BWP) of the serving cell is a dormant BWP; wherein the UE comprises: at least one first processor; and at least one first memory including first computer program code; the at least one first memory and the first computer program code configured to, with the at least one first processor, cause the UE at least to perform: triggering the PHR to the network node to report Power Headroom (PH) of the serving cell, wherein the PHR is triggered upon the following event: activation of the serving cell if a first Bandwidth Part (BWP) of the serving cell is not a dormant BWP and if the serving cell is a Secondary Cell (SCell) of a medium access control (MAC) entity, wherein the MAC entity is with configured uplink; and continuing downlink Reference Signal measurements without reporting to the network node, until the PHR is triggered after the active BWP switches from a dormant to a non-dormant BWP or the active BWP on the serving cell switches from a non-dormant BWP to a dormant BWP; wherein the network node comprises: at least one second processor; and at least one second memory including second computer program code; the at least one second memory and the second computer program code configured to, with the at least one second processor, cause the network node at least to perform: receiving the PHR from the UE to report PH of the serving cell; and obtaining a PH value for the serving cell from the PHR.
  9. 9 . A method for power headroom reporting to a network node associated with a plurality of serving cells, comprising: triggering, by a user equipment (UE), a power headroom report (PHR) to the network node to report Power Headroom (PH) of a serving cell, wherein the PHR is triggered upon the following event: activating of the serving cell if a first Bandwidth Part (BWP) of the serving cell is not a dormant BWP and if the serving cell is a Secondary Cell (SCell) of a medium access control (MAC) entity, wherein the MAC entity is with configured uplink; and continuing downlink Reference Signals measurements without reporting to the network node, until the PHR is triggered after the active BWP switches from a dormant BWP to a non-dormant BWP.
  10. 10 . The method of claim 9 , wherein the reported PH for the serving cell is indicated by one of the following: Type 1 PH; Type 3 PH; a designated field indicating whether the PH is Type 1 or Type 3; or a designated field indicating whether the serving cell is on a dormant BWP or non-dormant BWP.
  11. 11 . The method of claim 9 , wherein the reported PH for the serving cell is Type 1 PH with a virtual field indicating a PUSCH reference format is used, or wherein the reported PH for the serving cell is Type 3 PH depending on whether there is a Sounding Reference Signal (SRS) transmission on the dormant BWP when the PHR is reported.
  12. 12 . The method of claim 9 , wherein the PHR triggering is upon switching the active BWP from a dormant BWP to a non-dormant BWP if no PHR is reported for the serving cell when the active BWP is a dormant BWP.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a national phase entry of International Application No. PCT/CN2020/091438, filed May 20, 2020, the contents of which are hereby incorporated by reference in their entirety. TECHNICAL FIELD The teachings in accordance with example embodiments of present disclosure relate generally to wireless communication and, more specifically, relate to PHR for a serving cell. BACKGROUND This section is intended to provide a background or context to example embodiments of the present disclosure. The description herein may include concepts that could be pursued, but are not necessarily ones that have been previously conceived or pursued. Therefore, unless otherwise indicated herein, what is described in this section is not prior art to the description and claims in this application and is not admitted to be prior art by inclusion in this section. Certain abbreviations that may be found in the description and/or in the Figures are herewith defined as follows: A-CSI Aperiodic CSIBFD Beam Failure DetectionBFR Beam Failure RecoveryBWP Bandwidth PartCSI Channel State InformationDL-SCH Downlink Shared ChannelgNB 5G Node B/Base StationHARQ Hybrid Automatic Repeat RequestLS Liaison StatementsLTE Long Term EvolutionMAC CE Medium Access Control Control ElementNR New Radio (5G)NW NetworkPCell Primary CellPDCCH Physical Downlink Control ChannelPH Power HeadroomPHR Power Headroom ReportP-SRS Periodic SRSPSCell Primary Secondary CellPUCCH Physical Uplink Control ChannelRAN Radio Access NetworkRel ReleaseRRC Radio Resource ControlSCell Secondary CellSP/A-SRS Semi-persistent/Aperiodic-SRSSpCell Special Cell (PCell/PSCell)SRS Sounding Reference SignalUE User EquipmentUL UplinkUL-SCH Uplink Shared Channel In LTE, the so-called “dormant SCell state” was introduced in Rel-15 according to the following: No PDCCH monitoring;No UL transmissions;Only periodic CSI reporting allowed via PCell. The introduction of this state was to allow power saving while also having faster activation of SCells than with deactivated SCells. In NR, a similar concept was introduced via a “Dormant BWP” introduced in Rel-16 [TS 38.321 from e R2-2004183]. 1> if a BWP is activated and it is dormant BWP: 2> stop the bwp-Inandorsed CRctivityTimer of this Serving Cell, if running.2> not monitor the PDCCH on the BWP;2> not monitor the PDCCH for the BWP;2> not receive DL-SCH on the BWP;2> perform CSI measurement for the BWP, if configured;2> not transmit SRS on the BWP;2> not transmit on UL-SCH on the BWP;2> not transmit PUCCH on the BWP.2> clear any configured downlink assignment and any configured uplink grant Type 2 associated with the SCell respectively;2> suspend any configured uplink grant Type 1 associated with the SCell;2> if configured, perform beam failure detection and beam failure recovery for the SCell if beam failure is detected. SUMMARY The scope of protection sought for various embodiments of the present disclosure is set out by the independent claims. The embodiments and features, if any, described in this specification that do not fall under the scope of the independent claims are to be interpreted as examples useful for understanding various embodiments of the present disclosure. According to a first aspect, various embodiments provide a method for PHR for a serving cell, wherein an active BWP of the serving cell is a dormant BWP. A UE sends a PHR to a network node to report PH of the serving cell; wherein at least one of the following is reported for the serving cell: Type 1 PH;Type 3 PH;a designated field indicating whether the PH is Type 1 or Type 3;a designated field indicating whether the serving cell is on a dormant BWP or non-dormant BWP. According to a second aspect, various embodiments provide a method for PHR for a serving cell, wherein an active BWP of the serving cell is a dormant BWP. A NW node receives a PHR from a UE to report PH of the serving cell and obtains PH value for the serving cell from the PHR. Herein, at least one of the following is reported for the serving cell: Type 1 PH;Type 3 PH;a designated field indicating whether the PH is Type 1 or Type 3;a designated field indicating whether the serving cell is on a dormant BWP or non-dormant BWP. According to a third aspect, various embodiments provide a method for PHR for a serving cell. A UE sends a PHR to a network node to report PH of the serving cell when the PHR is triggered upon a switching event that an active BWP on the serving cell switching from a dormant BWP to a non-dormant BWP or that the active BWP on the serving cell switching from a non-dormant BWP to a dormant BWP. According to a fourth aspect, various embodiments provide a method for PHR for a serving cell, wherein an active BWP of the serving cell is a dormant BWP. A UE sends a PHR to at least a network node to report PH of the serving cell; the network node receives the PHR from the UE to report PH of the serving cell and obtains PH value from the PH