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KR-20260063843-A - Terminal device and operating method of the device

KR20260063843AKR 20260063843 AKR20260063843 AKR 20260063843AKR-20260063843-A

Abstract

The present invention provides a technology that enables CSI-RS transmission of a 6G terminal without affecting the operation of an existing 5G terminal in a cell where 5G and 6G share a frequency (i.e., a 5G terminal and a 6G terminal operate in the same area and the same frequency band), and specifically provides a concrete technical solution for the setup and procedure for 6G CSI-RS transmission.

Inventors

  • 최기완

Assignees

  • 에스케이텔레콤 주식회사

Dates

Publication Date
20260507
Application Date
20241031

Claims (11)

  1. In a terminal device, Memory containing instructions; and By executing the above command, a processor that receives and uses a specific DL-RS (Downlink-Reference Signal) transmitted by the first or second base station in a cell that shares a frequency between the first and second base stations of different communication networks; The above specific DL-RS is, A terminal device characterized by receiving according to the same setting or according to a different setting between the first and second base stations according to the DL-RS setting procedure between the first and second base stations.
  2. In Article 1, The DL-RS setup procedure between the first and second base stations above is A process in which the second base station shares DL-RS configuration and scheduling information of the first base station through an interface defined between the first and second base stations, A process in which the second base station sets up DL-RS transmission at the second base station based on the DL-RS setting and scheduling information, and transmits result information according to the setting to the first base station. A terminal device characterized by including a process in which the first base station changes the DL-RS settings of the first base station when necessary based on the result information.
  3. In Article 2, The above DL-RS configuration and scheduling information includes, The above first base station includes CSI-MeasConfiguration and PDSCH-Configuration information used to configure NZP-CSI-RS, CSI-IM, and ZP-CSI-RS in the terminal, and PDSCH scheduling indication information for each RB. The above result information includes, A terminal device characterized by including CSI-MeasConfiguration and PDSCH-Configuration information used to configure NZP-CSI-RS, CSI-IM, and ZP-CSI-RS in the terminal at the second base station.
  4. In Article 1, The specific DL-RS mentioned above is an NZP (non-zero-power)-CSI-RS, and When the second base station confirms that there is no PDSCH transmission between the first and second base stations in a resource where the CSI-RS of the first base station is configured, A terminal device characterized by setting the NZP-CSI-RS transmission for the terminal to be the same as the NZP-CSI-RS of the first base station or to a different resource from the NZP-CSI-RS of the first base station.
  5. In Article 1, The specific DL-RS mentioned above is NZP-CSI-RS, and When the second base station confirms that there is no PDSCH transmission of the first base station and there is a PDSCH transmission of the second base station in a resource where the CSI-RS of the first base station is configured, Set the NZP-CSI-RS transmission for the terminal to be the same as the NZP-CSI-RS of the first base station, or A terminal device characterized by setting NZP-CSI-RS transmission for the terminal to a resource different from the NZP-CSI-RS of the first base station, and setting ZP-CSI-RS transmission to a resource where the NZP-CSI-RS of the first base station is set.
  6. In Article 5, The above-mentioned second base station is, A terminal device characterized by establishing ZP-CSI-RS transmission for a resource where the CSI-IM of the first base station is set when the CSI-IM setting of the first base station is confirmed.
  7. In Article 1, The specific DL-RS mentioned above is NZP-CSI-RS, and When the second base station confirms that there is a PDSCH transmission of the first base station in a resource where the CSI-RS of the first base station is configured to transmit, NZP-CSI-RS transmission for the terminal is configured to be identical to the NZP-CSI-RS of the first base station or configured to a different resource from the NZP-CSI-RS of the first base station, A terminal device characterized in that, when the first base station recognizes that the NZP-CSI-RS of the second base station is set to a resource different from the NZP-CSI-RS of the first base station, it sets ZP-CSI-RS transmission for the resource on which the NZP-CSI-RS of the second base station is set.
  8. In Article 7, The above-mentioned first base station is, A terminal device characterized by setting ZP-CSI-RS transmission for a resource where the CSI-IM of the second base station is set when the CSI-IM setting of the second base station is recognized.
  9. In the method of operating a terminal device, In a cell that shares a frequency between a first base station and a second base station of different communication networks, the method includes the step of receiving and using a specific DL-RS transmitted by the first or second base station; The above specific DL-RS is, A method of operation of a terminal device characterized by receiving according to the same setting or according to a different setting between the first and second base stations according to the DL-RS setting procedure between the first and second base stations.
  10. In base station devices, Memory containing instructions; and A base station device characterized by including: a processor that, by executing the above command, sets the transmission of a specific DL-RS to a terminal to be the same as or different from the specific DL-RS transmission setting of the other base station based on information sharing with the other base station in a cell that shares a frequency between the base station device of a specific communication network and another base station of another communication network.
  11. In Article 10, The specific DL-RS mentioned above is NZP-CSI-RS, and The above processor is, A base station device characterized by setting the transmission of NZP-CSI-RS for the above terminal to a resource different from the resource where the NZP-CSI-RS of the other base station is set, and setting the transmission of ZP-CSI-RS to the resource where the NZP-CSI-RS of the other base station is set.

Description

Terminal device and operating method of the device The present invention relates to a transmission technology for a downlink interfering signal transmitted by a base station to a terminal. In NR (5G) using MIMO systems and high frequency ranges, instead of the Cell-Specific RS (CRS) allocated to the entire cell that has been used in LTE, various types of RS are defined to suit the various situations of the terminal (UE), and RS suitable for each beam of MIMO are exchanged, thereby evolving to respond to different frequency bands and various scenarios. As such, among the RS defined in 5G, CSI (Channel State Information)-RS is a representative DL-RS (Downlink-Reference Signal) defined to estimate the state of the downlink channel between the base station (gNB) and the terminal (UE). The process of downlink channel estimation using CSI-RS is as follows: when the base station (gNB) transmits CSI-RS, the terminal (UE) reports to the base station (gNB) the results (CSI) of measuring the downlink channel status (CQI, RI, PMI, CRI, LI, etc.) and interference conditions (intra-cell, inter-cell) based on the received CSI-RS. Accordingly, the base station (gNB) can determine the status and interference of the downlink channel with the terminal (UE) based on the CSI Report received from the terminal (UE), and can perform tasks such as link adaptation, beamforming, power control, and downlink scheduling for the terminal (UE). Meanwhile, new frequencies for the newly emerging 6G (or subsequent generations) are being discussed primarily in high-frequency bands (e.g., FR3 - 7~24GHz) that are less favorable for coverage than existing LTE and 5G frequencies, and for 6G terminal coverage upon introduction, it is necessary to utilize low-frequency bands in 6G as well. However, since most low-frequency bands are already saturated and being utilized for existing mobile communication technologies such as LTE and 5G, as well as other services such as broadcasting, it is difficult to discover new ones. Therefore, in order to use low-frequency bands in 6G, it will eventually be necessary to share frequencies with existing 5G through spectrum sharing technology. Accordingly, the present invention proposes a method to accommodate the operation of a 6G terminal without affecting the operation of an existing 5G terminal in a cell where 5G and 6G share a frequency (i.e., where a 5G terminal and a 6G terminal operate in the same area and the same frequency band). FIG. 1 is an example diagram showing a cell environment in which 5G and 6G share a frequency in the present invention. Figure 2 is an example diagram illustrating a CSI-RS setup operating in 5G. FIG. 3 is a block diagram specifically illustrating the configuration of a terminal device and a base station device according to an embodiment of the present invention. FIG. 4 is an example diagram illustrating a method for setting up CSI-RS in 5G and 6G according to the proposal of the present invention. Figure 5 is a call processing scenario illustrating the CSI-RS setup procedure between 5G and 6G according to an embodiment of the present invention. Hereinafter, various embodiments of the present invention will be described with reference to the attached drawings. The present invention relates to a transmission technology for a downlink interfering signal transmitted by a base station to a terminal. In NR (5G) using MIMO systems and high frequency ranges, instead of the Cell-Specific RS (CRS) allocated to the entire cell that has been used in LTE, various types of RS are defined to suit the various situations of the terminal (UE), and RS suitable for each beam of MIMO are exchanged, thereby evolving to respond to different frequency bands and various scenarios. As such, among the RS defined in 5G, CSI (Channel State Information)-RS is a representative DL-RS (Downlink-Reference Signal) defined to estimate the state of the downlink channel between the base station (gNB) and the terminal (UE). The process of downlink channel estimation using CSI-RS is as follows: when the base station (gNB) transmits CSI-RS, the terminal (UE) reports to the base station (gNB) the results (CSI) of measuring the downlink channel status (CQI, RI, PMI, CRI, LI, etc.) and interference conditions (intra-cell, inter-cell) based on the received CSI-RS. Accordingly, the base station (gNB) can determine the status and interference of the downlink channel with the terminal (UE) based on the CSI Report received from the terminal (UE), and can perform tasks such as link adaptation, beamforming, power control, and downlink scheduling for the terminal (UE). Currently, the types of CSI-RS defined in 5G can be classified into the following three types according to their functions and roles. NZP (Non-Zero-Power)-CSI-RS: Channel measurement and intra-cell interference measurement CSI-IM (Interference Measurement): Inter-cell interference measurement ZP(Zero-Power)-CSI-RS: PDSCH rate matching Meanwhile, new frequencies for