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KR-20260062848-A - Method and apparatus of transmitting signal for channel state information feedback in wireless communication system

KR20260062848AKR 20260062848 AKR20260062848 AKR 20260062848AKR-20260062848-A

Abstract

A method of a terminal may include: receiving configuration information for measuring channel state information (CSI) from a first cell; generating CSI from a downlink (DL) reference signal (RS) received from a second cell based on the configuration information; receiving a first MAC (medium access control) CE (control element) from the first cell; and transmitting a CSI report including the generated CSI to the second cell based on the first MAC CE.

Inventors

  • 김철순
  • 김지형
  • 문성현
  • 이정훈
  • 정회윤

Assignees

  • 한국전자통신연구원

Dates

Publication Date
20260507
Application Date
20251022
Priority Date
20241028

Claims (20)

  1. By means of the terminal, A step of receiving setting information for measuring channel state information (CSI) from a first cell; Based on the above setting information, a step of generating a CSI from a downlink (DL) reference signal (RS) received from a second cell; A step of receiving a first MAC (medium access control) CE (control element) from the first cell; and Based on the first MAC CE, the method comprises the step of transmitting a CSI report containing the generated CSI to the second cell. method.
  2. In claim 1, The first cell above is a serving cell, and the second cell above is a lower-layer triggered mobility (LTM) candidate cell, method.
  3. In claim 2, The first cell and the second cell are operated by the same central unit (CU) of the same base station, operated by different CUs of the same base station, or operated by different CUs of different base stations. method.
  4. In claim 1, The above configuration information includes a CSI report configuration and a CSI resource configuration, wherein the CSI resource configuration includes at least one of a set of at least one channel measurement resource (CMR) or a set of at least one interference measurement resource (IMR). method.
  5. In claim 4, A step of receiving a second MAC CE from the first cell for adding, updating, or releasing attributes of at least one CMR set, a CMR resource belonging to the at least one CMR set, or a CMR resource belonging to the at least one CMR set; and The method further includes the step of adding, updating, or deleting the attributes of the at least one CMR set, the CMR resource belonging to the at least one CMR set, or the CMR resource belonging to the at least one CMR set, based on the above second MAC CE. The addition, updating, or deletion of a CMR resource belonging to the at least one CMR set or an attribute of a CMR resource belonging to the at least one CMR set is performed by the addition, updating, or deletion of a TCI (transmission configuration indicator) status identifier corresponding to the CMR resource belonging to the at least one CMR set or an attribute of a CMR resource belonging to the at least one CMR set. method.
  6. In claim 4, A step of receiving a second MAC CE from the first cell for adding, updating, or releasing attributes of at least one IMR set, a CMR resource belonging to the at least one IMR set, or an IMR resource belonging to the at least one IMR set; and The method further includes the step of adding, updating, or removing attributes of at least one IMR set, an IMR resource belonging to the at least one IMR set, or an IMR resource belonging to the at least one IMR set based on the above second MAC CE. The addition, updating, or deletion of an IMR resource belonging to the at least one IMR set or an attribute of an IMR resource belonging to the at least one IMR set is performed by the addition, updating, or deletion of a TCI (transmission configuration indicator) status identifier corresponding to the IMR resource belonging to the at least one IMR set or an attribute of an IMR resource belonging to the at least one IMR set. method.
  7. In claim 1, The above CSI report is transmitted to the second cell via a PUSCH (physical uplink shared channel) within a random access (RA) procedure for the second cell, method.
  8. In claim 7, The modulation and coding scheme (MCS) applied to the above CSI report is determined based on at least one field among the uplink (UL) grant fields included in the random access response (RA) Msg2 (message 2) received from the first cell within the RA procedure, and the beta offset for determining the code rate of the above CSI report is received via radio resource control (RRC) signaling, method.
  9. By the method of the first base station, A step of transmitting configuration information for measuring channel state information (CSI) to a terminal through a first cell operated by the first base station; and The method includes the step of transmitting a first MAC (medium access control) CE (control element) to the terminal through the first cell, and The first MAC CE causes the terminal to transmit to the second cell a CSI report including a CSI derived from a downlink (DL) reference signal (RS) of the second cell operated by the first base station or a second base station different from the first base station, method.
  10. In claim 9, The first cell above is a serving cell, and the second cell above is a lower-layer triggered mobility (LTM) candidate cell, method.
  11. In claim 9, The above configuration information includes a CSI report configuration and a CSI resource configuration, wherein the CSI resource configuration includes at least one of a set of at least one channel measurement resource (CMR) or a set of at least one interference measurement resource (IMR). method.
  12. In claim 11, The method further includes the step of transmitting a second MAC CE to the terminal through the first cell for adding, changing, or releasing attributes of the at least one CMR set, the CMR resource belonging to the at least one CMR set, or the CMR resource belonging to the at least one CMR set. The addition, updating, or deletion of a CMR resource belonging to the at least one CMR set or an attribute of a CMR resource belonging to the at least one CMR set is performed by the addition, updating, or deletion of a TCI (transmission configuration indicator) status identifier corresponding to the CMR resource belonging to the at least one CMR set or an attribute of a CMR resource belonging to the at least one CMR set. method.
  13. In claim 11, The method further includes the step of transmitting a second MAC CE to the terminal through the first cell for adding, changing, or releasing attributes of the at least one IMR set, the CMR resource belonging to the at least one IMR set, or the IMR resource belonging to the at least one IMR set. The addition, updating, or deletion of an IMR resource belonging to the at least one IMR set or an attribute of an IMR resource belonging to the at least one IMR set is performed by the addition, updating, or deletion of a TCI (transmission configuration indicator) status identifier corresponding to the IMR resource belonging to the at least one IMR set or an attribute of an IMR resource belonging to the at least one IMR set. method.
  14. In claim 10, The above CSI report is transmitted to the second cell via a physical uplink shared channel (PUSCH) within a random access (RA) procedure for the second cell, method.
  15. In claim 14, The modulation and coding scheme (MCS) applied to the above CSI report is determined based on at least one field among the uplink (UL) grant fields included in the random access response (RA) Msg2 (message 2) transmitted from the first cell within the above RA procedure, and the beta offset for determining the code rate of the above CSI report is transmitted via radio resource control (RAC) signaling, method.
  16. As a terminal including at least one processor, The above at least one processor is the terminal: A step of receiving setting information for measuring channel state information (CSI) from a first cell; A step of generating a CSI from a downlink (DL) reference signal (RS) received from a second cell based on the above setting information; A step of receiving a first MAC (medium access control) CE (control element) from the first cell; and Based on the first MAC CE above, performing the step of transmitting a CSI report including the generated CSI to the second cell. Terminal.
  17. In claim 16, The first cell above is a serving cell, and the second cell above is a lower-layer triggered mobility (LTM) candidate cell, Terminal.
  18. In claim 16, The above configuration information includes a CSI report configuration and a CSI resource configuration, wherein the CSI resource configuration includes at least one of a set of at least one channel measurement resource (CMR) or a set of at least one interference measurement resource (IMR). Terminal.
  19. In claim 18, The above at least one processor is the terminal: A step of receiving a second MAC CE from the first cell for adding, updating, or releasing attributes of at least one CMR set, a CMR resource belonging to the at least one CMR set, or a CMR resource belonging to the at least one CMR set; and Based on the above second MAC CE, additionally perform the step of adding, updating, or deleting the attributes of the at least one CMR set, the CMR resource belonging to the at least one CMR set, or the CMR resource belonging to the at least one CMR set. The addition, updating, or deletion of a CMR resource belonging to the at least one CMR set or an attribute of a CMR resource belonging to the at least one CMR set is performed by the addition, updating, or deletion of a TCI (transmission configuration indicator) status identifier corresponding to the CMR resource belonging to the at least one CMR set or an attribute of a CMR resource belonging to the at least one CMR set. Terminal.
  20. In claim 18, The above at least one processor is the terminal: A step of receiving a second MAC CE from the first cell for adding, updating, or releasing attributes of at least one IMR set, a CMR resource belonging to the at least one IMR set, or an IMR resource belonging to the at least one IMR set; and Based on the above second MAC CE, additionally perform the step of adding, updating, or removing the attributes of the at least one IMR set, the IMR resource belonging to the at least one IMR set, or the IMR resource belonging to the at least one IMR set. The addition, updating, or deletion of an IMR resource belonging to the at least one IMR set or an attribute of an IMR resource belonging to the at least one IMR set is performed by the addition, updating, or deletion of a TCI (transmission configuration indicator) status identifier corresponding to the IMR resource belonging to the at least one IMR set or an attribute of an IMR resource belonging to the at least one IMR set. Terminal.

Description

Method and apparatus of transmitting signal for channel state information feedback in wireless communication system The present invention relates to communication technology for a wireless communication system, and more specifically, to a method and apparatus for transmitting a signal for channel state information (CSI) feedback. Along with the advancement of information and communication technology, various wireless communication technologies are being developed. Representative wireless communication technologies include LTE (long term evolution) and NR (new radio), which are defined in the 3GPP (3rd generation partnership project) standards. LTE can be one of the wireless communication technologies among 4G (4th Generation) wireless communication technologies, and NR can be one of the wireless communication technologies among 5G (5th Generation) wireless communication technologies. To handle the surge in wireless data following the commercialization of 4G communication systems (e.g., communication systems supporting LTE), 5G communication systems (e.g., communication systems supporting NR) that use frequency bands higher than those of 4G communication systems (e.g., frequency bands below 6 GHz) are being considered. 5G communication systems can support eMBB (enhanced Mobile BroadBand), URLLC (Ultra-Reliable and Low Latency Communication), and mMTC (massive Machine Type Communication). Meanwhile, in 5G and 6G communication systems, lower-layer triggered mobility (LTM) procedures and multi-transmission and reception point (TRP) environments are being considered. Accordingly, various improvements are required in the procedure for a terminal to derive channel state information and report it to a base station. FIG. 1 is a conceptual diagram illustrating a first embodiment of a communication system. FIG. 2 is a block diagram illustrating a first embodiment of a communication node constituting a communication system. FIG. 3 is a conceptual diagram illustrating a multi-TRP environment to which embodiments of the present disclosure are applied. Figure 4 is a flowchart illustrating the procedure for a terminal to perform a CSI report. FIG. 5 is a conceptual diagram illustrating the CSI reporting settings instructed to the terminal and the settings of CSI resources belonging to the CSI reporting settings. FIG. 6 is a conceptual diagram illustrating the format of the CSC MAC CE applied to the embodiments of the present disclosure. FIGS. 7 to 12 are conceptual diagrams for explaining UEI CSI reporting operations according to embodiments of the present disclosure. The present disclosure is capable of various modifications and may have various embodiments, and specific embodiments are illustrated in the drawings and described in detail. However, this is not intended to limit the present disclosure to specific embodiments, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the present disclosure. Terms such as "first," "second," etc., may be used to describe various components, but said components should not be limited by said terms. Such terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present disclosure, the first component may be named the second component, and similarly, the second component may be named the first component. The term "and/or" includes a combination of a plurality of related described items or any of a plurality of related described items. In embodiments of the present disclosure, "at least one of A and B" may mean "at least one of A or B" or "at least one of one or more combinations of A and B". Additionally, in embodiments of the present disclosure, "at least one of A and B" may mean "at least one of A or B" or "at least one of one or more combinations of A and B". When it is stated that one component is "connected" or "connected" to another component, it should be understood that while it may be directly connected or connected to that other component, there may also be other components in between. On the other hand, when it is stated that one component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between. The terms used in this disclosure are used merely to describe specific embodiments and are not intended to limit this disclosure. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this disclosure, terms such as “comprising” or “having” are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. Unless otherwise defined, all term