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WO-2026095580-A1 - UE POWER CLASS FALLBACK IN WIRELESS COMMUNICATION SYSTEMS

WO2026095580A1WO 2026095580 A1WO2026095580 A1WO 2026095580A1WO-2026095580-A1

Abstract

data transmission rate. Apparatuses and methods for transmit power in wireless communication systems. A method for operating a user equipment (UE) includes receiving first information for an uplink (UL) transmission on an UL carrier provided for UL carrier aggregation and receiving second information associated with a UE maximum output power mode for UL carrier aggregation. The method further includes determining, based on the first and the second information, a UE maximum output power for an UL transmission bandwidth on the UL carrier according to a UE power class, determining an UL transmit power based on the UE maximum output power, and transmitting, based on the UL transmit power, an UL signal or channel on the UL carrier.

Inventors

  • RUDOLF, MARIAN
  • PAPASAKELLARIOU, ARISTIDES

Assignees

  • SAMSUNG ELECTRONICS CO., LTD.

Dates

Publication Date
20260507
Application Date
20251028
Priority Date
20251003

Claims (15)

  1. A method for operating a user equipment (UE), the method comprising: receiving first information for an uplink (UL) transmission on an UL carrier provided for UL carrier aggregation; receiving second information associated with a UE maximum output power mode for UL carrier aggregation; determining, based on the first and the second information, a UE maximum output power for an UL transmission bandwidth on the UL carrier according to a UE power class; determining an UL transmit power based on the UE maximum output power; and transmitting, based on the UL transmit power, an UL signal or channel on the UL carrier.
  2. The method of claim 1, wherein: the UL carrier is a first UL carrier, a second UL carrier is provided for carrier aggregation, and the UE maximum output power associated with the first and second UL carriers corresponds to at least one of: a same determined UE maximum output power for UL transmissions in the first and second UL carriers, a separately determined UE maximum output power for UL transmissions in the first UL carrier and the second UL carrier, and a jointly determined UE maximum output power for a first UL transmission in the first UL carrier and a second UL transmission in the second UL carrier in a same time-domain resource.
  3. The method of claim 1, wherein: the UL carrier is a first UL carrier, a second UL carrier is provided for carrier aggregation, and the method further comprises determining the UE maximum output power mode according to the UE power class on a band combination or a frequency range combination for the first and second UL carriers.
  4. The method of claim 1, wherein receiving the second information associated with the UE maximum output power mode further comprises receiving an indication corresponding to the UE maximum output power mode, and determining the UL transmit power based on the UE maximum output power further comprises determining the UL transmit power based on the indication.
  5. The method of claim 1, wherein: the UL carrier is a first UL carrier, a second UL carrier is provided for carrier aggregation, and the method further comprises transmitting, via uplink control information (UCI), a medium-access-control (MAC) control element (CE), or a radio resource control (RRC) message, (i) values for first and second supported or indicated UE maximum output powers corresponding to the first and second UL carriers, respectively, or (ii) a value for a supported or indicated UE maximum output power mode corresponding to the first and second UL carriers.
  6. The method of claim 1, wherein: the UL carrier is a first UL carrier, a second UL carrier is provided for carrier aggregation, and the method further comprises: determining the UE maximum output power mode for UL carrier aggregation based on the UE maximum output power for the first UL carrier in case that a simultaneous UL transmission using the first and second UL carriers in a same time-domain resource is not indicated; and determining the UE maximum output power mode for UL carrier aggregation based on a first UE maximum output power associated with the first UL carrier and a second UE maximum output power associated with the second UL carrier in case that a simultaneous UL transmission using the first and second UL carriers in a same time-domain resource is indicated.
  7. A user equipment (UE) (116), comprising: at least one transceiver (310); at least one processor (340) communicatively coupled to the at least one transceiver (310); and at least one memory (360), communicatively coupled to the at least one processor (340), storing instructions executable by at least one processor (340) individually or in any combination to cause the UE to: receive first information for an uplink (UL) transmission on an UL carrier provided for UL carrier aggregation; and receive second information associated with a UE maximum output power mode for UL carrier aggregation; determine, based on the first and the second information, a UE maximum output power for an UL transmission bandwidth on the UL carrier according to a UE power class; determine an UL transmit power based on the UE maximum output power; and transmit, based on the UL transmit power, an UL signal or channel on the UL carrier.
  8. The UE (116) of claim 7, wherein: the UL carrier is a first UL carrier, a second UL carrier is provided for carrier aggregation, and the UE maximum output power associated with the first and second UL carriers corresponds to at least one of: a same determined UE maximum output power for UL transmissions in the first and second UL carriers, a separately determined UE maximum output power for UL transmissions in the first UL carrier and the second UL carrier, and a jointly determined UE maximum output power for a first UL transmission in the first UL carrier and a second UL transmission in the second UL carrier in a same time-domain resource.
  9. The UE (116)of claim 7, wherein: the UL carrier is a first UL carrier, a second UL carrier is provided for carrier aggregation, and the at least one processor (340) is further configured to determine the UE maximum output power mode according to a band combination or a frequency range combination for the first and second UL carriers.
  10. The UE (116)of claim 7, wherein: the transceiver is further configured to receive an indication corresponding to the UE maximum output power mode for UL carrier aggregation, and the at least one processor (340) is further configured to determine the UL transmit power based on the indication.
  11. The UE (116)of claim 7, wherein: the UL carrier is a first UL carrier, a second UL carrier is provided for carrier aggregation, and the at least one processor (340) is further configured to transmit, via uplink control information (UCI), a medium-access-control (MAC) control element (CE), or a radio resource control (RRC) message, (i) values for first and second supported or indicated UE maximum output powers corresponding to the first and second UL carriers, respectively, or (ii) a value for a supported or indicated UE maximum output power mode corresponding to the first and second UL carriers.
  12. The UE (116)of claim 7, wherein: the UL carrier is a first UL carrier, a second UL carrier is provided for carrier aggregation, and the at least one processor (340) is further configured to: determine the UE maximum output power mode for UL carrier aggregation based on the UE maximum output power for the first UL carrier when a simultaneous UL transmission using the first and second UL carriers in a same time-domain resource is not indicated; and determine the UE maximum output power mode for UL carrier aggregation based on a first UE maximum output power associated with the first UL carrier and a second UE maximum output power associated with the second UL carrier when a simultaneous UL transmission using the first and second UL carriers in a same time-domain resource is indicated.
  13. A base station (BS), comprising: at least one transceiver (210); at least one processor (225) communicatively coupled to the at least one transceiver (210); and at least one memory (230), communicatively coupled to the at least one processor (225), storing instructions executable by at least one processor (225) individually or in any combination to cause the BS to transmit first information for an uplink (UL) transmission on an UL carrier provided for UL carrier aggregation; transmit second information associated with a UE maximum output power mode for UL carrier aggregation; and receive an UL signal or channel on the UL carrier, the UL signal or channel transmitted based on an UL transmit power that is based on an UE maximum output power for an UL transmission bandwidth on the UL carrier according to a UE power class, the UE maximum output power based on the first and the second information.
  14. The BS of claim 13, wherein: the UL carrier is a first UL carrier, a second UL carrier is provided for carrier aggregation, and the UE maximum output power associated with the first and second UL carriers corresponds to at least one of: a same determined UE maximum output power for UL transmissions in the first and second UL carriers, a separately determined UE maximum output power for UL transmissions in the first UL carrier and the second UL carrier, and a jointly determined UE maximum output power for a first UL transmission in the first UL carrier and a second UL transmission in the second UL carrier in a same time-domain resource.
  15. The BS of claim 13, wherein: the UL carrier is a first UL carrier, a second UL carrier is provided for carrier aggregation, and the UE maximum output power mode is further based on a band combination or a frequency range combination for the first and second UL carriers.

Description

UE POWER CLASS FALLBACK IN WIRELESS COMMUNICATION SYSTEMS The present disclosure relates generally to wireless communication systems and, more specifically, to user equipment (UE) power class fallback in wireless communication systems. 5G mobile communication technologies define broad frequency bands such that high transmission rates and new services are possible, and can be implemented not only in "Sub 6GHz" bands such as 3.5GHz, but also in "Above 6GHz" bands referred to as mmWave including 28GHz and 39GHz. In addition, it has been considered to implement 6G mobile communication technologies (referred to as Beyond 5G systems) in terahertz bands (for example, 95GHz to 3THz bands) in order to accomplish transmission rates fifty times faster than 5G mobile communication technologies and ultra-low latencies one-tenth of 5G mobile communication technologies. At the beginning of the development of 5G mobile communication technologies, in order to support services and to satisfy performance requirements in connection with enhanced Mobile BroadBand (eMBB), Ultra Reliable Low Latency Communications (URLLC), and massive Machine-Type Communications (mMTC), there has been ongoing standardization regarding beamforming and massive MIMO for mitigating radio-wave path loss and increasing radio-wave transmission distances in mmWave, supporting numerologies (for example, operating multiple subcarrier spacings) for efficiently utilizing mmWave resources and dynamic operation of slot formats, initial access technologies for supporting multi-beam transmission and broadbands, definition and operation of BWP (BandWidth Part), new channel coding methods such as a LDPC (Low Density Parity Check) code for large amount of data transmission and a polar code for highly reliable transmission of control information, L2 pre-processing, and network slicing for providing a dedicated network specialized to a specific service. Currently, there are ongoing discussions regarding improvement and performance enhancement of initial 5G mobile communication technologies in view of services to be supported by 5G mobile communication technologies, and there has been physical layer standardization regarding technologies such as V2X (Vehicle-to-everything) for aiding driving determination by autonomous vehicles based on information regarding positions and states of vehicles transmitted by the vehicles and for enhancing user convenience, NR-U (New Radio Unlicensed) aimed at system operations conforming to various regulation-related requirements in unlicensed bands, NR UE Power Saving, Non-Terrestrial Network (NTN) which is UE-satellite direct communication for providing coverage in an area in which communication with terrestrial networks is unavailable, and positioning. Moreover, there has been ongoing standardization in air interface architecture/protocol regarding technologies such as Industrial Internet of Things (IIoT) for supporting new services through interworking and convergence with other industries, IAB (Integrated Access and Backhaul) for providing a node for network service area expansion by supporting a wireless backhaul link and an access link in an integrated manner, mobility enhancement including conditional handover and DAPS (Dual Active Protocol Stack) handover, and two-step random access for simplifying random access procedures (2-step RACH for NR). There also has been ongoing standardization in system architecture/service regarding a 5G baseline architecture (for example, service based architecture or service based interface) for combining Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technologies, and Mobile Edge Computing (MEC) for receiving services based on UE positions. As 5G mobile communication systems are commercialized, connected devices that have been exponentially increasing will be connected to communication networks, and it is accordingly expected that enhanced functions and performances of 5G mobile communication systems and integrated operations of connected devices will be necessary. To this end, new research is scheduled in connection with eXtended Reality (XR) for efficiently supporting AR (Augmented Reality), VR (Virtual Reality), MR (Mixed Reality) and the like, 5G performance improvement and complexity reduction by utilizing Artificial Intelligence (AI) and Machine Learning (ML), AI service support, metaverse service support, and drone communication. Furthermore, such development of 5G mobile communication systems will serve as a basis for developing not only new waveforms for providing coverage in terahertz bands of 6G mobile communication technologies, multi-antenna transmission technologies such as Full Dimensional MIMO (FD-MIMO), array antennas and large-scale antennas, metamaterial-based lenses and antennas for improving coverage of terahertz band signals, high-dimensional space multiplexing technology using OAM (Orbital Angular Momentum), and RIS (Reconfigurable Intelligent