Method and apparatus for transmitting and receiving channel state information - reference signal (csi-rs)

{
  "publication_number": "US2020127724A1",
  "country": "US",
  "kind": "A1",
  "title": "Method and apparatus for transmitting and receiving channel state information - reference signal (csi-rs)",
  "abstract": "Disclosed is a method for transmitting and receiving a channel state information (CSI)-reference signal (RS) in a wireless communication system. Specifically, the method performed by a base station may include: configuring control information indicating that an antenna port for all CSI-RS resources included in a CSI-RS resource set is same, wherein the CSI-RS resource set is used for tracking at least one of a time or a frequency; transmitting the configured control information to a user equipment (UE); and transmitting the CSI-RS to the UE through all the CSI-RS resources. In doing so, the UE is capable of performing time/frequency tracking more precisely.",
  "claims": [
    "1. A method of transmitting, by a base station, a channel state information (CSI)-reference signal (RS) in a wireless communication system, the method comprising: configuring control information for a plurality of CSI-RS resources, with the control information indicating that antenna ports for all of the plurality of CSI-RS resources included in a CSI-RS resource set configured for tracking at least one of a time or a frequency are the same; transmitting, to a user equipment (UE), the control information; and transmitting, to the UE, the CSI-RS on same antenna ports of the plurality of CSI-RS resources based on the control information. 2. The method of claim 1, wherein each of the plurality of CSI-RS resources are configured with the same periodicity. 3. The method of claim 1, wherein the UE is in a radio resource control (RRC) connected state. 4. The method of claim 1, wherein the CSI-RS is a periodic CSI-RS. 5. The method of claim 1, wherein all of the plurality of CSI-RS resources are configured in a single slot or configured over multiple slots. 6. The method of claim 5, wherein the multiple slots are consecutive slots. 7. The method of claim 5, wherein in a state in which the plurality of CSI-RS resources are configured in a single slot, symbol locations of the plurality of CSI-RS resources are different. 8. The method of claim 1, wherein code division multiplexing (CDM) is not applied to the plurality of CSI-RS resources. 9. The method of claim 1, wherein a frequency domain density of each of the plurality of CSI-RS resources is greater than 1. 10. The method of claim 1, wherein the plurality of 1 -port CSI-RS resources are not configured both for the tracking and for beam management. 11. The method of claim 1, wherein a first CSI-RS resource, among the plurality of CSI-RS resources that are used for the tracking is quasi co-located (QCL) with (i) a second CSI-RS resource that is used for CSI acquisition, (ii) a third CSI-RS resource that is used for beam management, or (iii) an synchronization signal/physical broadcast channel block (SSB). 12. The method of claim 1, wherein a linkage between the plurality of CSI-RS resources and a specific report setting is set. 13. The method of claim 11, wherein the specific report setting is null report setting. 14. The method of claim 1, further comprising: receiving, from the UE, information related to a time-domain density of the CSI-RSs. 15. The method of claim 14, wherein the CSI-RSs are configured in the time domain in a single slot or over consecutive slots. 16. A method of receiving, by a user equipment (UE), a channel state information (CSI)-reference signal (RS) in a wireless communication system, the method comprising: receiving, from a base station, configuration information for a plurality of CSI-RS resources, wherein the configuration information comprises control information indicating that antenna ports for all of the plurality of CSI-RS resources included in a CSI-RS resource set configured for tracking at least one of a time or a frequency are the same; receiving, from the base station, the CSI-RS on same antenna ports of the plurality of CSI-RS resources based on the control information; and tracking at least one of the time or the frequency based on the CSI-RS. 17. The method of claim 16, wherein each of the plurality of CSI-RS resources are configured with the same periodicity. 18. A base station configured to transmit a channel state information (CSI)-reference signal (RS) in a wireless communication system, the base station comprising: a transmitter configured to transmit a wireless signal; a receiver configured to receive a wireless signal; at least one processor; and at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor perform operations comprising: configuring control information for a plurality of CSI-RS resources, with the control information indicating that antenna ports for all of the plurality of CSI-RS resources included in a CSI-RS resource set configured for tracking at least one of a time or a frequency are the same; transmitting, to a user equipment (UE), the control information; and transmitting, to the UE, the CSI-RS on same antenna ports of the plurality of CSI-RS resources based on the control information, wherein each of the plurality of CSI-RS resources are configured with the same periodicity."
  ],
  "description_excerpt": "The present disclosure relates to a wireless communication system and, more particularly, to a method for transmitting and receiving a channel state information (CSI)-reference signal (RS) and an apparatus supporting the same.\n\nMobile communication systems have been generally developed to provide voice services while guaranteeing user mobility. Such mobile communication systems have gradually expanded their coverage from voice services through data services up to high-speed data services. However, as current mobile communication systems suffer resource shortages and users demand even higher-speed services, development of more advanced mobile communication systems is needed.\n\nThe requirements of the next-generation mobile communication system may include supporting huge data traffic, a remarkable increase in the transfer rate of each user, the accommodation of a significantly increased number of connection devices, very low end-to-end latency, and high energy efficiency. To this end, various techniques, such as small cell enhancement, dual connectivity, massive multiple input multiple output (MIMO), in-band full duplex, non-orthogonal multiple access (NOMA), supporting super-wide band, and device networking, have been researched.\n\nThe present disclosure is to provide a method of designing a reference signal (RS) (e.g., TRS) to be used for time/frequency tracking.\n\nThe present disclosure proposes a method of explicitly or implicitly providing configuration of a TRS.",
  "cpc": [
    "H04B 7/0626",
    "H04B 7/0456",
    "H04B 7/0695",
    "H04J 13/16",
    "H04L 27/261",
    "H04L 5/0023",
    "H04L 5/0048",
    "H04L 5/005",
    "H04L 5/0053",
    "H04L 5/0082",
    "H04L 5/0094",
    "H04W 24/10",
    "H04W 72/0446",
    "H04W 76/27"
  ],
  "ipc": [
    "H04B 7/0456",
    "H04B 7/06",
    "H04J 13/16",
    "H04L 5/00",
    "H04W 76/27"
  ],
  "assignees": [
    "LG Electronics Inc"
  ],
  "inventors": [
    "Jiwon Kang",
    "Jonghyun Park",
    "Kilbom LEE",
    "Kijun KIM",
    "Sukhyon Yoon"
  ],
  "filing_date": "2019-12-17",
  "publication_date": "2020-04-23",
  "priority_date": "2017-07-21",
  "application_number": "US-201916717357-A",
  "family_id": "65015450",
  "cited_by_count": 11
}