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EP-4736344-A1 - METHOD AND APPARATUS FOR CHANNEL STATE INFORMATION REPORTING

EP4736344A1EP 4736344 A1EP4736344 A1EP 4736344A1EP-4736344-A1

Abstract

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. Apparatuses and methods for channel state information (CSI) reporting. A method performed by a user equipment (UE) includes receiving information about a channel state information (CSI) report. The information indicates N g CSI reference signal (CSI-RS) resources, where N g ≥ 1. The method further includes, based on the information: measuring the N g CSI-RS resources; identifying a number of groups of receive antenna ports, N , where N > 1; and determining the CSI report associated with the N g CSI-RS resources based on the number of groups of receive antenna ports. The method further includes transmitting the CSI report. The number of groups of receive antenna ports is according to a UE capability. The CSI report includes a rank indicator (RI) of ν layers, N PMI ≥ 1 precoding matrix indicators (PMIs), and N CQI ≥ 1 channel quality indicators (CQIs).

Inventors

  • LEE, Gilwon
  • RAHMAN, Md Saifur
  • ONGGOSANUSI, EKO NUGROHO

Assignees

  • Samsung Electronics Co., Ltd.

Dates

Publication Date
20260506
Application Date
20240906

Claims (15)

  1. A user equipment (UE) comprising: a transceiver; and a processor operably coupled to the transceiver, the processor configured to: receive information about a channel state information (CSI) report, the information indicating CSI reference signal (CSI-RS) resources, where , based on the information: measure the CSI-RS resources, identify a number of groups of receive antenna ports, , where , determine the CSI report associated with the CSI-RS resources based on the number of groups of receive antenna ports, and transmit the CSI report, wherein the number of groups of receive antenna ports is according to a UE capability, wherein the CSI report includes a rank indicator (RI) of layers, precoding matrix indicators (PMIs), and channel quality indicators (CQIs).
  2. The UE of Claim 1, wherein, in case that the RI indicates , , and , the PMI and CQI is associated with the receive antenna port groups and one codeword, where the one codeword is mapped onto the layers.
  3. The UE of Claim 1, wherein, in case that the RI indicates , , and : one of the PMIs is associated with one receive antenna port group and a first codeword, and another of the PMIs is associated with another receive antenna port group and a second codeword, where: the first codeword is mapped onto layers and associated with one of the CQIs, and the second codeword is mapped onto layers and associated with another of the CQIs, where .
  4. The UE of Claim 1, wherein, in case that the RI indicates , , and , each of the PMIs is associated with a codeword for , where the codeword is mapped onto layers and associated with each CQI for and where .
  5. The UE of Claim 1, wherein: the processor is further configured to determine a layer-splitting indicator (LSI), where the LSI indicates a number of layers for a respective codeword , and the CSI report further includes the LSI.
  6. The UE of Claim 5, wherein, in case that , the LSI is selected from a subset of pairs for a given in a table: .
  7. The UE of Claim 1, wherein: there are only two possible values of , and the UE capability indicates the information via a one bit indicator.
  8. A base station (BS) comprising: a transceiver; and a processor operably coupled to the transceiver, the processor configured to: transmit information about a channel state information (CSI) report, the information indicating CSI reference signal (CSI-RS) resources, where ; and receive the CSI report associated with the CSI-RS resources based on a number of groups of antenna ports, , where , wherein the number of groups of antenna ports is according to a user equipment (UE) capability, and wherein the CSI report includes a rank indicator (RI) of layers, precoding matrix indicators (PMIs), and channel quality indicators (CQIs).
  9. The BS of Claim 8, wherein, in case that the RI indicates , , and , the PMI and CQI is associated with the receive antenna port groups and one codeword, where the one codeword is mapped onto the layers.
  10. The BS of Claim 8, wherein, in case that the RI indicates , , and : one of the PMIs is associated with one receive antenna port group and a first codeword, and another of the PMIs is associated with another receive antenna port group and a second codeword, where: the first codeword is mapped onto layers and associated with one of the CQIs, and the second codeword is mapped onto layers and associated with another of the CQIs, where .
  11. The BS of Claim 8, wherein, in case that the RI indicates , , and , each of the PMIs is associated with a codeword for , where the codeword is mapped onto layers and associated with each CQI for and where .
  12. The BS of Claim 8, wherein: a layer-splitting indicator (LSI) indicates a number of layers for a respective codeword , the CSI report further includes the LSI, and in case that , the LSI is selected from a subset of pairs for a given in a table: .
  13. The BS of Claim 8, wherein: there are only two possible values of , and the UE capability indicates the information via a one bit indicator.
  14. A method performed by a user equipment (UE), the method comprising: receiving information about a channel state information (CSI) report, the information indicating CSI reference signal (CSI-RS) resources, where , based on the information: measuring the CSI-RS resources, identifying a number of groups of receive antenna ports, , where , determining the CSI report associated with the CSI-RS resources based on the number of groups of receive antenna ports, and transmitting the CSI report, wherein the number of groups of receive antenna ports is according to a UE capability, wherein the CSI report includes a rank indicator (RI) of layers, precoding matrix indicators (PMIs), and channel quality indicators (CQIs).
  15. A method performed by a base station (BS), the method comprising: transmitting information about a channel state information (CSI) report, the information indicating CSI reference signal (CSI-RS) resources, where ; and receivting the CSI report associated with the CSI-RS resources based on a number of groups of antenna ports, , where , wherein the number of groups of antenna ports is according to a user equipment (UE) capability, and wherein the CSI report includes a rank indicator (RI) of layers, precoding matrix indicators (PMIs), and channel quality indicators (CQIs).

Description

METHOD AND APPARATUS FOR CHANNEL STATE INFORMATION REPORTING The present disclosure relates generally to wireless communication systems and, more specifically, the present disclosure is related to apparatuses and methods for channel state information (CSI) reporting. Wireless communication has been one of the most successful innovations in modern history. Recently, the number of subscribers to wireless communication services exceeded five billion and continues to grow quickly. The demand of wireless data traffic is rapidly increasing due to the growing popularity among consumers and businesses of smart phones and other mobile data devices, such as tablets, "note pad" computers, net books, eBook readers, and machine type of devices. In order to meet the high growth in mobile data traffic and support new applications and deployments, improvements in radio interface efficiency and coverage are of paramount importance. To meet the demand for wireless data traffic having increased since deployment of 4G communication systems, and to enable various vertical applications, 5G communication systems have been developed and are currently being deployed. 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 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 devi