Search

EP-4740341-A1 - METHOD AND DEVICE FOR REPORTING CHANNEL STATE INFORMATION IN WIRELESS COMMUNICATION SYSTEM

EP4740341A1EP 4740341 A1EP4740341 A1EP 4740341A1EP-4740341-A1

Abstract

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. According to various embodiments, a method performed by a user equipment (UE) in a wireless communication system, the method comprising: receiving, from a base station, information configuring a channel state information-reference signal (CSI-RS) resource with more than 32 antenna ports, wherein the CSI-RS resource is an aggregation of a plurality of CSI-RS resources; and receiving, from the base station, a CSI-RS on the CSI-RS resource, wherein each of the plurality of CSI-RS resources has an equal number of antenna ports, and wherein a number of the plurality of CSI-RS resources is one of two, three, or four.

Inventors

  • JANG, Youngrok
  • ABEBE, Ameha Tsegaye
  • LIM, Seongmok
  • Ji, Hyoungju
  • CHOI, Kyungjun

Assignees

  • Samsung Electronics Co., Ltd.

Dates

Publication Date
20260513
Application Date
20240730

Claims (15)

  1. A user equipment (UE) in a wireless communication system, the UE comprising: a transceiver; and a controller coupled to the transceiver, and configured to: receive, from a base station, information configuring a channel state information -reference signal (CSI-RS) resource with more than 32 antenna ports, wherein the CSI-RS resource is an aggregation of a plurality of CSI-RS resources, and receive, from the base station, a CSI-RS on the CSI-RS resource, wherein each of the plurality of CSI-RS resources has an equal number of antenna ports, and wherein a number of the plurality of CSI-RS resources is one of two, three, or four.
  2. The UE of claim 1, wherein each of the plurality of CSI-RS resources has at least one of a same power control offset value, a same power control offset value for a synchronization signal, or a same quasi co-located (QCL) value.
  3. The UE of claim 1, wherein a CSI processing time for the CSI-RS resource with more than 32 antenna ports is scaled based on a total number of antenna ports for the plurality of CSI-RS resources, and wherein a CSI processing unit (CPU) occupation is determined according to a value of the total number of antenna ports divided by 32.
  4. The UE of claim 1, wherein, in case that information on a time restriction for channel measurements is received, an occasion for each of the plurality of CSI-RS resources for computing a CSI report is located most recent and no later than an occasion for a CSI reference resource.
  5. A base station in a wireless communication system, the base station comprising: a transceiver; and a controller coupled to the transceiver, and configured to: transmit, to a user equipment (UE), information configuring a channel state information-reference signal (CSI-RS) resource with more than 32 antenna ports, wherein the CSI-RS resource is an aggregation of a plurality of CSI-RS resources, and transmit, to the UE, a CSI-RS on the CSI-RS resource, wherein each of the plurality of CSI-RS resources has an equal number of antenna ports, and wherein a number of the plurality of CSI-RS resources is one of two, three, or four.
  6. The base station of claim 5, wherein each of the plurality of CSI-RS resources has at least one of a same power control offset value, a same power control offset value for a synchronization signal, or a same quasi co-located (QCL) value.
  7. The base station of claim 5, wherein a CSI processing time for the CSI-RS resource with more than 32 antenna ports is scaled based on a total number of antenna ports for the plurality of CSI-RS resources, and wherein a CSI processing unit (CPU) occupation is determined according to a value of the total number of antenna ports divided by 32.
  8. The base station of claim 5, wherein, in case that information on a time restriction for channel measurements is transmitted, an occasion for each of the plurality of CSI-RS resources for computing a CSI report is located most recent and no later than an occasion for a CSI reference resource.
  9. A method performed by a user equipment (UE) in a wireless communication system, the method comprising: receiving, from a base station, information configuring a channel state information-reference signal (CSI-RS) resource with more than 32 antenna ports, wherein the CSI-RS resource is an aggregation of a plurality of CSI-RS resources; and receiving, from the base station, a CSI-RS on the CSI-RS resource, wherein each of the plurality of CSI-RS resources has an equal number of antenna ports, and wherein a number of the plurality of CSI-RS resources is one of two, three, or four.
  10. The method of claim 9, wherein each of the plurality of CSI-RS resources has at least one of a same power control offset value, a same power control offset value for a synchronization signal, or a same quasi co-located (QCL) value.
  11. The method of claim 9, wherein a CSI processing time for the CSI-RS resource with more than 32 antenna ports is scaled based on a total number of antenna ports for the plurality of CSI-RS resources, and wherein a CSI processing unit (CPU) occupation is determined according to a value of the total number of antenna ports divided by 32.
  12. The method of claim 9, wherein, in case that information on a time restriction for channel measurements is received, an occasion for each of the plurality of CSI-RS resources for computing a CSI report is located most recent and no later than an occasion for a CSI reference resource.
  13. A method performed by a base station in a wireless communication system, the method comprising: transmitting, to a user equipment (UE), information configuring a channel state information-reference signal (CSI-RS) resource with more than 32 antenna ports, wherein the CSI-RS resource is an aggregation of a plurality of CSI-RS resources; and transmitting, to the UE, a CSI-RS on the CSI-RS resource, wherein each of the plurality of CSI-RS resources has an equal number of antenna ports, and wherein a number of the plurality of CSI-RS resources is one of two, three, or four.
  14. The method of claim 13, wherein each of the plurality of CSI-RS resources has at least one of a same power control offset value, a same power control offset value for a synchronization signal, or a same quasi co-located (QCL) value.
  15. The method of claim 13, wherein a CSI processing time for the CSI-RS resource with more than 32 antenna ports is scaled based on a total number of antenna ports for the plurality of CSI-RS resources, and wherein a CSI processing unit (CPU) occupation is determined according to a value of the total number of antenna ports divided by 32.

Description

METHOD AND DEVICE FOR REPORTING CHANNEL STATE INFORMATION IN WIRELESS COMMUNICATION SYSTEM The disclosure relates to an operation of a terminal and a base station in a wireless communication system. Specifically, the disclosure relates to a method of reporting channel state information in a wireless communication system, and a device capable of performing same. 5th generation (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 (THz) 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 coverag