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EP-4277366-B1 - METHOD AND APPARATUS FOR TRANSMITTING POWER HEADROOM REPORT BY USER EQUIPMENT IN WIRELESS COMMUNICATION SYSTEM

EP4277366B1EP 4277366 B1EP4277366 B1EP 4277366B1EP-4277366-B1

Inventors

  • LEE, Hanul
  • LEE, SUNYOUNG

Dates

Publication Date
20260506
Application Date
20230201

Claims (8)

  1. A method for transmitting a power headroom report, PHR, by a user equipment (100), UE, in a wireless communication system, the method comprising: selecting a first power headroom value among power headroom values for two or more Transmission and Reception Points, TRPs, of a first serving cell belonging to a first cell group configured with twoPHRmode by prioritizing a power headroom value calculated based on a real transmission over a power headroom value calculated based on a virtual transmission; generating the PHR including the first power headroom value; transmitting the PHR to a network through a second cell group not configured with the twoPHRmode.
  2. The method of claim 1, further comprising obtaining a second power headroom value for a second serving cell belonging to the second cell group not configured with the twoPHRmode, wherein the PHR further includes the second power headroom value.
  3. The method of claim 2, wherein the first power headroom value and the second power headroom value are included in the PHR in ascending order of a serving cell index.
  4. The method of claim 3, wherein another PHR to be transmitted through the first cell group configured with the twoPHRmode includes all of the power headroom values for the two or more TRPs of the first serving cell belonging to the first cell group and the second power headroom value for the second serving cell belonging to the second cell group.
  5. A user equipment (100), UE, in a wireless communication system, the UE (100) comprising: at least one transceiver (106); at least one processor (102); and at least one computer memory (104) operably connectable to the at least one processor (102) and storing instructions that, when executed by the at least one processor (102), cause the UE (100) to perform operations comprising: selecting a first power headroom value among power headroom values for two or more Transmission and Reception Points, TRPs, of a serving cell belonging to a first cell group configured with twoPHRmode by prioritizing a power headroom value calculated based on a real transmission over a power headroom value calculated based on a virtual transmission; generating a power headroom report, PHR, including the first power headroom value; transmitting the PHR to a network through a second cell group not configured with the twoPHRmode, wherein the first power headroom value is related to a TRP on which a real transmission occurs among the two or more TRPs.
  6. The UE (100) of claim 5, wherein the operations further comprise obtaining a second power headroom value for a serving cell belonging to the second cell group not configured with the twoPHRmode, wherein the PHR further includes the second power headroom value.
  7. The UE (100) of claim 6, wherein the first power headroom value and the second power headroom value are included in the PHR in ascending order of a serving cell index.
  8. The UE (100) of claim 7, wherein another PHR to be transmitted through the first cell group configured with the twoPHRmode includes all of the power headroom values for the two or more TRPs of the first serving cell belonging to the first cell group and the second power headroom value for the second serving cell belonging to the second cell group.

Description

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a wireless communication system, and more particularly, to a method for transmitting a Power Headroom Report (PHR) by a user equipment (UE) in a wireless communication system and an apparatus therefor. Discussion of the Related Art Introduction of new radio communication technologies has led to increases in the number of user equipments (UEs) to which a base station (BS) provides services in a prescribed resource region, and has also led to increases in the amount of data and control information that the BS transmits to the UEs. Due to typically limited resources available to the BS for communication with the UE(s), new techniques are needed by which the BS utilizes the limited radio resources to efficiently receive/transmit uplink/downlink data and/or uplink/downlink control information. In particular, overcoming delay or latency has become an important challenge in applications whose performance critically depends on delay/latency. 3GPP Contribution by Interdigital, titled "Reporting procedure for multi-TRP PHR", R2-2205960, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE discloses a method for transmitting a power headroom report (PHR) by a user equipment (UE) in a wireless communication system, involving calculating two PHRs for serving cells configured with mTRP PUSCH repetition when twoPHRMode is active, generating Enhanced PHR MAC CE including two PHRs for mTRP cells and one for sTRP cells and reporting across MAC entities. SUMMARY OF THE INVENTION The invention is defined by the appended independent claims. Dependent claims constitute embodiments of the invention. Accordingly, the present disclosure is directed to a method for transmitting a Power Headroom Report (PHR) by a user equipment (UE) in a wireless communication system and an apparatus therefor, which substantially obviate one or more problems due to limitations and disadvantages of the related art. Additional advantages, objects, and features of the specification will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the specification. The objectives and other advantages of the specification may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. It will be appreciated by persons skilled in the art that the effects that can be achieved through the present invention are not limited to what has been particularly described hereinabove and other advantages of the present invention will be more clearly understood from the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates an example of a communication system to which implementations of the present disclosure is applied;FIG. 2 is a block diagram illustrating examples of communication devices which can perform a method according to the present disclosure;FIG. 3 illustrates another example of a wireless device which can perform implementations of the present invention;FIG. 4 illustrates an example of protocol stacks in a third generation partnership project (3GPP) based wireless communication system;FIG. 5 illustrates an example of a frame structure in a 3GPP based wireless communication system;FIG. 6 illustrates a data flow example in the 3GPP new radio (NR) system;FIG. 7 illustrates an example of PDSCH time domain resource allocation by PDCCH, and an example of PUSCH time resource allocation by PDCCH;FIG. 8 illustrates an example of physical layer processing at a transmitting side;FIG. 9 illustrates an example of physical layer processing at a receiving side.FIG. 10 illustrates operations of the wireless devices based on the implementations of the present disclosure;FIG. 11 shows an example of Enhanced Single Entry PHR;FIG. 12 shows an example of Enhanced Multiple Entry PHR;FIG. 13 shows an example of Enhanced Single Entry PHR for multiple TRP MAC CE;FIG. 14 shows an example of Enhanced Multiple Entry PHR for multiple TRP MAC CE;FIG. 15 shows an example of transmitting PHR to gNB supporting twoPHRMode;FIG. 16 shows another example of transmitting PHR to gNB not supporting twoPHRMode; andFIG. 17 shows an example of transmitting PHR to gNB not supporting twoPHRMode according to the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The technical objects that can be achieved through the present disclosure are not limited to what has been particularly described hereinabove and other technical objects not described herein will be more clearly understood by persons skilled in the art from the following detailed description. Reference will now be made in detail to the exemplary implementations of the present disclosure, examples of which are il