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EP-4740316-A1 - UCI PROCESSING

EP4740316A1EP 4740316 A1EP4740316 A1EP 4740316A1EP-4740316-A1

Abstract

Apparatuses and methods for uplink control information (UCI) processing. A method performed by a base station (BS) in an open radio access network (O-RAN) architecture includes receiving, by an O-RAN radio unit (O-RU) hosting a low-physical (PHY) layer and radio frequency (RF) processing, an uplink (UL) transmission and decoding, based on the received UL transmission, UCI including channel state information (CSI). The BS further includes an O-RAN distributed unit (O-DU) operably coupled with the O-RU that hosts a high-PHY layer. The low-PHY and high-PHY layers are based on a lower layer functional split of PHY layer baseband functionalities.

Inventors

  • RAHMAN, Md Saifur
  • ONGGOSANUSI, EKO NUGROHO
  • FARAG, Emad Nader

Assignees

  • Samsung Electronics Co., Ltd.

Dates

Publication Date
20260513
Application Date
20250110

Claims (15)

  1. A base station (BS) in an open radio access network (O-RAN) architecture, the BS comprising: an O-RAN distributed unit (O-DU) hosting a high-physical (PHY) layer, and an O-RAN radio unit (O-RU) operably coupled with the O-DU, the O-RU hosting a low-PHY layer and radio frequency (RF) processing, wherein the O-RU comprises: a transceiver configured to receive an uplink (UL) transmission, and a processor operably coupled with the transceiver, the processor configured to decode, based on the received UL transmission, uplink control information (UCI) including channel state information (CSI), and wherein the low-PHY and high-PHY layers are based on a lower layer functional split of PHY layer baseband functionalities.
  2. The BS of Claim 1, wherein: the processor of the O-RU, based on the received UL transmission, is further configured to transfer information to the O-DU via an interface between the O-DU and the O-RU, and the interface is a fronthaul (FH).
  3. The BS of Claim 2, wherein: the UCI is a first part of a two-part UCI, a processor of the O-DU, based on the information, is further configured to decode a second part of the two-part UCI, and the first part and the second part of the two-part UCI include at least one of: a first precoding matrix indicator (PMI) and a second PMI, respectively, a first codeword (CW) and a second CW, respectively, PMI and remaining components of the CSI, respectively, a CSI part 1 and a CSI part 2, respectively, of the CSI, respectively, and the CSI and at least one of a hybrid automatic repeat request acknowledgement (HARQ-ACK), a negative acknowledgement (NACK), and a scheduling request (SR), respectively.
  4. The BS of Claim 1, wherein the UL transmission includes (i) the UCI only, the UCI carrying the CSI only or (ii) the UCI and UL data.
  5. The BS of Claim 1, wherein: the processor of the O-RU is configured to perform bit-level processing to extract information bits from the UCI, and the bit-level processing includes channel decoding based on polar or low density parity check (LDPC) channel coding and decoding schemes.
  6. The BS of Claim 1, wherein the BS further comprises: multiple O-RUs, each connected to the O-DU, of which the O-RU is one, and an inter-O-RU direct access link to facilitate communication between the multiple O-RUs.
  7. The BS of Claim 1, wherein the processor of the O-RU includes a singular value decomposition (SVD) processor for determining SVD-based precoding.
  8. A method performed by a base station (BS) in an open radio access network (O-RAN) architecture, the method comprising: receiving, by an O-RAN radio unit (O-RU) hosting a low-physical (PHY) layer and radio frequency (RF) processing, an uplink (UL) transmission; and decoding, based on the received UL transmission, uplink control information (UCI) including channel state information (CSI), wherein the BS further includes an O-RAN distributed unit (O-DU) operably coupled with the O-RU, the O-DU hosting a high-PHY layer, and wherein the low-PHY and high-PHY layers are based on a lower layer functional split of PHY layer baseband functionalities.
  9. The method of Claim 8, further comprising: transferring, based on the received UL transmission, information to the O-DU via an interface between the O-DU and the O-RU; and decoding, by the O-DU based on the information, a second part of the two-part UCI, wherein the UCI is a first part of a two-part UCI, and wherein the interface is a fronthaul (FH).
  10. The method of Claim 9, wherein the first part and the second part of the two-part UCI include at least one of: a first precoding matrix indicator (PMI) and a second PMI, respectively, a first codeword (CW) and a second CW, respectively, PMI and remaining components of the CSI, respectively, a CSI part 1 and a CSI part 2, respectively, of the CSI, respectively, and the CSI and at least one of a hybrid automatic repeat request acknowledgement (HARQ-ACK), a negative acknowledgement (NACK), and a scheduling request (SR), respectively.
  11. The method of Claim 8, further comprising: performing, by the O-RU, bit-level processing to extract information bits from the UCI, wherein the bit-level processing includes channel decoding based on polar or low density parity check (LDPC) channel coding and decoding schemes.
  12. The method of Claim 8, wherein the BS further comprises: multiple O-RUs, each connected to the O-DU, of which the O-RU is one, and an inter-O-RU direct access link to facilitate communication between the multiple O-RUs.
  13. The method of Claim 8, wherein the O-RU includes a singular value decomposition (SVD) processor for determining SVD-based precoding.
  14. A user equipment (UE) communicating with a base station (BS) in an open radio access network (O-RAN) architecture, the UE comprising: a transceiver configured to receive information about uplink control information (UCI) including channel state information (CSI); and a processor operably coupled with the transceiver, the processor configured to determine the CSI, and encode the UCI, the UCI including the CSI, wherein the transceiver is further configured to transmit an uplink (UL) transmission including the UCI, and wherein the BS comprises an O-RAN distributed unit (O-DU) hosting a high-physical (PHY) layer and an O-RAN radio unit (O-RU) operably coupled with the O-DU, the O-RU hosting a low-PHY layer and radio frequency (RF) processing, wherein the low-PHY and high-PHY layers are based on a lower layer functional split of PHY layer baseband functionalities, and wherein the O-RU decodes the UCI carrying the CSI.
  15. The UE of Claim 14, wherein the CSI includes at least a precoding matrix indicator (PMI).

Description

UCI PROCESSING The present disclosure relates generally to wireless communication systems and, more specifically, the present disclosure is related to apparatuses and methods for uplink control information (UCI) processing. 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 3.5 GHz, but also in "Above 6 GHz" bands referred to as mmWave including 28 GHz and 39 GHz. In addition, it has been considered to implement 6th generation (6G) mobile communication technologies (referred to as Beyond 5G systems) in terahertz bands (for example, 95 GHz to 3 THz 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 multi input multi output (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 bandwidth part (BWP), new channel coding methods such as a low density parity check (LDPC) 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 vehicle-to-everything (V2X) 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, new radio unlicensed (NR-U) 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, integrated access and backhaul (IAB) 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 dual active protocol stack (DAPS) 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 Augmented Reality (AR), Virtual Reality (VR), Mixed Reality (MR) 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 Orbital Angu