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KR-20260066722-A - Method and apparatus for transmitting and receiving an uplink channel

KR20260066722AKR 20260066722 AKR20260066722 AKR 20260066722AKR-20260066722-A

Abstract

A method according to an embodiment of the present specification includes the steps of receiving a DCI for scheduling a PUSCH and transmitting the PUSCH based on a precoder. A TPMI and/or SRI for determining the precoder is indicated based on the DCI. The TPMI is indicated based on a first field representing one of first indices. The precoder is associated with one or more RBs among scheduled resource blocks (RBs). The first indices are characterized by being associated with TPMIs based on the same PTRS port.

Inventors

  • 정찬호
  • 김형태
  • 강지원
  • 박해욱

Assignees

  • 엘지전자 주식회사

Dates

Publication Date
20260512
Application Date
20240912
Priority Date
20230918

Claims (15)

  1. In terms of method, A step of receiving Downlink Control Information (DCI) for scheduling a Physical Uplink Shared Channel (PUSCH), determining a precoder based on the DCI; and The step of transmitting the PUSCH based on the above precoder; wherein A Transmit Precoding Matrix Index (TPMI) and/or a Sounding Reference Signal Resource Indicator (SRI) for determining the above precoder are indicated based on the above DCI, and The above TPMI is indicated based on a first field representing one of the first indices, and The above precoder is associated with one or more RBs among the scheduled resource blocks (RBs), and A method characterized in that the above first indices are associated with TPMIs based on the same Phase Tracking Reference Signal (PTRS) port.
  2. In Article 1, The above PUSCH is associated with four antenna ports 1000 to 1003, and A method characterized in that the same PTRS port is PTRS port 0 or PTRS port 1 associated with two of the four antenna ports.
  3. In Article 2, A method characterized in that the TPMIs based on the same PTRS port are associated with precoding matrices in which the elements associated with the remaining two antenna ports among the four antenna ports are zero.
  4. In Paragraph 3, Based on the fact that the above identical PTRS port is PTRS port 0 associated with antenna ports 1000 and 1002, A method characterized in that the TPMIs based on the same PTRS ports are associated with the precoding matrices in which the second and fourth elements associated with antenna ports 1001 and 1003 are 0.
  5. In Paragraph 3, Based on the fact that the above identical PTRS port is PTRS port 1 associated with antenna ports 1001 and 1003, A method characterized in that the TPMIs based on the same PTRS ports are associated with the precoding matrices in which the first and third elements associated with antenna ports 1000 and 1002 are 0.
  6. In Article 1, A method characterized in that the first field is a precoding information and number of layers field.
  7. In Article 6, A method characterized in that the first indexes are indexes of a table defined based on the TPMIs based on the same PTRS port.
  8. In Article 1, The above SRI is indicated based on an SRI field representing one of the second indices, and A method characterized in that the above second indices are related to SRIs based on the same PTRS port.
  9. In Article 8, The above SRIs based on the same PTRS port are, A method characterized by being related to SRS resources in which the same PTRS port is configured among the SRS resources within the SRS resource set.
  10. In Article 8, i) based on the number of SRS resources in the SRS resource set being 4, and ii) the same PTRS port being configured on 2 of the 4 SRS resources: A method characterized in that the SRIs based on the same PTRS port are two SRIs associated with two SRS resources among four SRIs.
  11. In the terminal, One or more transmitters/receivers; One or more processors; and It includes one or more memories connected to the above one or more processors and storing instructions, A terminal characterized by the above instructions being set so that the one or more processors perform all steps of the method according to any one of claims 1 to 10, based on execution by the one or more processors.
  12. In a device comprising one or more memories and one or more processors functionally connected to the one or more memories, An apparatus characterized in that the above one or more memories store instructions that set the one or more processors to perform all steps of the method according to any one of claims 1 to 10, based on execution by the above one or more processors.
  13. In one or more non-transitory computer-readable media storing instructions, One or more non-transitory computer-readable media characterized by instructions executable by one or more processors, wherein the one or more processors are configured to perform all steps of the method according to any one of claims 1 to 10.
  14. In terms of method, A step of transmitting Downlink Control Information (DCI) for scheduling a Physical Uplink Shared Channel (PUSCH), determining a precoder based on the DCI; and The method includes the step of receiving the PUSCH based on the above-mentioned precoder; A Transmit Precoding Matrix Index (TPMI) and/or a Sounding Reference Signal Resource Indicator (SRI) for determining the above precoder are indicated based on the above DCI, and The above TPMI is indicated based on a first field mapped to one of the defined indices, and The above precoder is associated with one or more RBs among the scheduled resource blocks (RBs), and A method characterized in that the indices defined above are related to TPMIs based on the same Phase Tracking Reference Signal (PTRS) port.
  15. In the case of a base station, One or more transmitters/receivers; One or more processors; and It includes one or more memories connected to the above one or more processors and storing instructions, A base station characterized by the above instructions being set so that the one or more processors perform all steps of the method according to claim 14, based on execution by the one or more processors.

Description

Method and apparatus for transmitting and receiving an uplink channel This specification relates to a method and apparatus for transmitting and receiving an uplink channel. Mobile communication systems were developed to provide voice services while ensuring user mobility. However, mobile communication systems have expanded their scope to include data services as well as voice. Currently, due to the explosive increase in traffic leading to resource shortages and users demanding higher-speed services, more advanced mobile communication systems are required. The requirements for next-generation mobile communication systems largely include the ability to accommodate explosive data traffic, a dramatic increase in transmission rates per user, a significantly increased number of connected devices, very low end-to-end latency, and high energy efficiency. To achieve this, various technologies are being researched, such as dual connectivity, massive multiple input multiple output (MMIMO), in-band full duplex, non-orthogonal multiple access (NOMA), super wideband support, and device networking. According to existing operation, in the case of PUSCH, the same precoding is applied to scheduled RBs (wideband precoding). In the future, subband precoding may be supported in frequency selective channel environments (subband precoding). Figure 1 is a diagram showing an example of an uplink transmission and reception operation. FIG. 2 is a flowchart for explaining a method according to one embodiment of the present specification. FIG. 3 is a flowchart illustrating a method according to another embodiment of the present specification. FIG. 4 is a diagram showing the configuration of a first device and a second device according to an embodiment of the present specification. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. The detailed description disclosed below, together with the accompanying drawings, is intended to describe exemplary embodiments of the present invention and is not intended to represent the only embodiment in which the present invention may be practiced. The following detailed description includes specific details to provide a complete understanding of the present invention. However, those skilled in the art will know that the present invention may be practiced without such specific details. In some cases, to avoid obscuring the concept of the present invention, known structures and devices may be omitted or illustrated in the form of a block diagram focusing on the core functions of each structure and device. In the following, the downlink (DL) refers to communication from a base station to a terminal, and the uplink (UL) refers to communication from a terminal to a base station. In the downlink, the transmitter may be part of the base station and the receiver may be part of the terminal. In the uplink, the transmitter may be part of the terminal and the receiver may be part of the base station. The base station may be referred to as the first communication device and the terminal as the second communication device. The base station (BS) may be replaced by terms such as fixed station, Node B, eNB (evolved-NodeB), gNB (Next Generation NodeB), BTS (base transceiver system), Access Point (AP), network (5G network), AI system, RSU (road side unit), vehicle, robot, drone (Unmanned Aerial Vehicle, UAV), AR (Augmented Reality) device, VR (Virtual Reality) device, etc. In addition, the terminal may be fixed or mobile and may be replaced with terms such as UE (User Equipment), MS (Mobile Station), UT (user terminal), MSS (Mobile Subscriber Station), SS (Subscriber Station), AMS (Advanced Mobile Station), WT (Wireless terminal), MTC (Machine-Type Communication) device, M2M (Machine-to-Machine) device, D2D (Device-to-Device) device, vehicle, robot, AI module, drone (Unmanned Aerial Vehicle, UAV), AR (Augmented Reality) device, VR (Virtual Reality) device. DMRS (demodulation reference signal) DMRS reception procedure We will examine the DMRS-related operations for PDSCH reception. When receiving a PDSCH scheduled by DCI format 1_0 or when receiving a PDSCH before any dedicated upper layer configuration of dmrs-AdditionalPosition, maxLength, and dmrs-Type parameters, the terminal assumes that there is no PDSCH in any symbol carrying DM-RS except for a PDSCH with a duration of 2 symbols with PDSCH mapping type B, a single symbol front-loaded DM-RS of configuration type 1 is transmitted on DM-RS port 1000, and that all remaining orthogonal antenna ports are not involved in the transmission of PDSCH to other terminals. Additionally, for a PDSCH with mapping type A, the terminal assumes that there are up to two additional single-symbol DM-RS symbols with dmrs-AdditionalPosition='pos2' in the slot according to the PDSCH duration specified in the DCI. For a PDSCH with a mapping type B and an allocation duration of 7 symbols for a nor