Method performed by terminal or network in wireless communication system, and device therefor

Abstract

A terminal according to at least one of embodiments disclosed in the present specification: receives, from a serving cell, information about one or more candidate cells for L1 / L2-triggered mobility (LTM); and transmits, to the serving cell, a channel state information (CSI) report for LTM on the basis of a CSI reference resource for the one or more candidate cells, wherein the information about the one or more candidate cells includes information about candidate cell subcarrier spacing (SCS), and the CSI reference resource can be determined on the basis of the information about the candidate cell SCS.

Description

A method performed by a terminal or network in a wireless communication system and an apparatus for the same

[0001] The present disclosure relates to a wireless communication system, and more specifically, to a method and apparatus performed between a mobile terminal and a network operating a plurality of cells in a wireless communication system.

[0002] Wireless communication systems are being widely deployed to provide various types of communication services, such as voice and data. Generally, a wireless communication system is a multiple access system capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.). Examples of multiple access systems include CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), and SC-FDMA (single carrier frequency division multiple access) systems.

[0003] In wireless communication systems, particularly in mobile communication systems, terminal mobility is an important consideration, and various techniques for low-latency and rapid mobility management and support are being discussed.

[0004] The technical problem to be solved by the present disclosure is to provide a method and apparatus for supporting lower-layer triggered mobility (LTM) for rapid mobility. As an example, a method for reporting a calculated CSI for a candidate cell for LTM may be provided. Additionally, a method for determining a reference CSI resource to calculate the CSI for a candidate cell may be provided.

[0005] In addition to the technical challenges described above, other technical challenges can be inferred from the description below.

[0006] According to one aspect of the present disclosure, a method performed by a terminal comprises receiving information about one or more candidate cells for LTM (L1 / L2-triggered mobility) from a serving cell; and transmitting a CSI report for LTM to the serving cell based on a CSI (channel state information) reference resource for the one or more candidate cells, wherein the information about the one or more candidate cells includes information about candidate cell SCS (subcarrier spacing), and the CSI reference resource may be determined based on the information about the candidate cell SCS.

[0007] Information regarding the above candidate cell SCS may provide at least one of the DL (downlink) SCS or UL (uplink) SCS for each candidate cell.

[0008] The CSI reference resource can be determined based on the SCS having the smallest value within an SCS set that includes the SCSs of one or more of the above candidate cells.

[0009] The above CSI reference resource is a parameter (n) calculated based on information regarding the above candidate cell SCS.CSI_ref It can be determined based on ) and slot offset.

[0010] The above slot offset can be determined based on whether the terminal is synchronized to a specific candidate cell related to the above CSI reference resource.

[0011] Based on the fact that the terminal is synchronized with the specific candidate cell, the terminal can calculate the slot offset based on the specific candidate cell.

[0012] Based on the fact that the terminal is not synchronized with the specific candidate cell, a specific slot offset received from the serving cell can be used as the slot offset.

[0013] The above CSI reference resource may be associated with an effective DL (downlink) slot of a specific candidate cell.

[0014] The above valid DL slot may include at least one of the DL symbol or Flexible symbol of the specific candidate cell.

[0015] The information regarding one or more of the above candidate cells may include TDD (time divisional duplexing) UL (uplink)-DL setting information of the specific candidate cell.

[0016] The above TDD UL-DL setting information may include information regarding the DL / Flexible / UL slot or symbol configuration of the specific candidate cell.

[0017] The above effective DL slot can be located within the measurement gap set for LTM.

[0018] According to another aspect of the present disclosure, a computer-readable non-transitory recording medium may be provided that records a program for performing the method described above.

[0019] An apparatus according to another aspect of the present disclosure comprises: at least one processor; and at least one memory configured to store instructions that, when executed by the at least one processor, cause the at least one processor to perform operations, wherein the operations of the at least one processor include receiving information about one or more candidate cells for LTM (L1 / L2-triggered mobility) from a serving cell; and transmitting a CSI report for LTM to the serving cell based on a CSI (channel state information) reference resource for the one or more candidate cells, wherein the information about the one or more candidate cells includes information about candidate cell SCS (subcarrier spacing), and the CSI reference resource may be determined based on the information about the candidate cell SCS.

[0020] The above device may further include a transmitter and receiver.

[0021] The above device may be a terminal.

[0022] The above device may be a processing device configured to control a terminal.

[0023] According to another aspect of the present disclosure, a method performed by a base station comprises: transmitting information about one or more candidate cells for LTM (L1 / L2-triggered mobility) through a serving cell of a terminal; and receiving a CSI (channel state information) report for LTM from the terminal through the serving cell, wherein the CSI report relates to a CSI reference resource for the one or more candidate cells, and the information about the one or more candidate cells includes information about candidate cell SCS (subcarrier spacing), and the CSI reference resource may be determined based on the information about the candidate cell SCS.

[0024] A base station according to another aspect of the present disclosure comprises at least one processor; and at least one memory configured to store instructions that, when executed by the at least one processor, cause the at least one processor to perform operations, wherein the operations of the at least one processor include transmitting information about one or more candidate cells for LTM (L1 / L2-triggered mobility) through a serving cell of a terminal; and receiving a CSI (channel state information) report for LTM from the terminal through the serving cell, wherein the CSI report relates to a CSI reference resource for the one or more candidate cells, and the information about the one or more candidate cells includes information about candidate cell SCS (subcarrier spacing), and the CSI reference resource may be determined based on the information about the candidate cell SCS.

[0025] According to one embodiment, by providing a method for calculating and reporting CSI for candidate cells for LTM, it is possible to support terminal mobility more accurately and efficiently. By setting / defining a CSI reference resource for calculating the CSI of candidate cells, the criteria for CSI calculation in LTM can be clearly defined, and more accurate candidate cell measurement and LTM can be performed.

[0026] In addition to the technical effects described above, other technical effects can be inferred from the description below.

[0027] FIG. 1 illustrates physical channels used in a 3GPP system, which is an example of a wireless communication system, and a general signal transmission method using them.

[0028] Figure 2 illustrates the structure of a radio frame.

[0029] Figure 3 illustrates a resource grid of slots.

[0030] Figure 4 illustrates an example where a physical channel is mapped within a slot.

[0031] Figure 5 shows an example of a CSI-related procedure.

[0032] Figure 6 illustrates an example of an LTM procedure.

[0033] FIG. 7 is a diagram illustrating operations performed by a terminal and a network according to one embodiment.

[0034] FIG. 8 illustrates the flow of a method performed by a terminal according to one embodiment.

[0035] FIG. 9 illustrates the flow of a method performed by a base station according to one embodiment.

[0036] FIGS. 10 to 13 illustrate a communication system (1) and a wireless device applicable to the present disclosure.

[0037] The following technologies can be used in various wireless access systems such as CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), and SC-FDMA (single carrier frequency division multiple access). CDMA can be implemented using radio technologies such as UTRA (Universal Terrestrial Radio Access) or CDMA2000. TDMA can be implemented using radio technologies such as GSM (Global System for Mobile Communications), GPRS (General Packet Radio Service), and EDGE (Enhanced Data Rates for GSM Evolution). OFDMA can be implemented using radio technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and E-UTRA (Evolved UTRA). UTRA is part of the UMTS (Universal Mobile Telecommunications System). 3GPP (3rd Generation Partnership Project) LTE (long term evolution) is part of E-UMTS (Evolved UMTS) using E-UTRA, and LTE-A (Advanced) is an evolved version of 3GPP LTE. 3GPP NR (New Radio or New Radio Access Technology) is an evolved version of 3GPP LTE / LTE-A.

[0038] As more communication devices require larger communication capacities, the need for enhanced mobile broadband communication compared to existing Radio Access Technology (RAT) is emerging. Additionally, massive Machine Type Communications (MTC), which connects multiple devices and objects to provide various services anytime and anywhere, is one of the major issues to be considered in next-generation communication. Furthermore, communication system designs that take into account services and terminals sensitive to reliability and latency are being discussed. As such, the introduction of next-generation RAT considering enhanced Mobile Broadband Communication (eMBB), massive MTC, and Ultra-Reliable and Low Latency Communication (URLLC) is being discussed, and for convenience, this technology is referred to as NR (New Radio or New RAT) in this specification.

[0039] For clarity of explanation, the description is based primarily on 3GPP NR, but the technical concept of the present disclosure is not limited thereto.

[0040] In this specification, the expression "setting" may be replaced with the expression "configure / configuration," and the two may be used interchangeably. Additionally, conditional expressions (e.g., "if," "in a case," or "when") may be replaced with expressions such as "based on that" or "in a state / status." Furthermore, the operation of a terminal / base station or SW / HW configuration based on the fulfillment of the corresponding conditions may be inferred or understood. Moreover, regarding signal transmission and reception between wireless communication devices (e.g., base station, terminal), if the process of the receiving (or transmitting) side can be inferred or understood from the process of the transmitting (or receiving) side, such description may be omitted. For example, signal determination / generation / encoding / transmission by the transmitting side may be understood as signal monitoring reception / decoding / determination by the receiving side. Furthermore, the expression that the terminal performs (or does not perform) a specific operation can also be interpreted as the base station operating under the expectation / assumption (or expectation / assumption that the terminal does not perform) the specific operation. The expression that the base station performs (or does not perform) a specific operation can also be interpreted as the terminal operating under the expectation / assumption (or expectation / assumption that the base station does not perform) the specific operation. Additionally, the classification and indexing of each section, embodiment, example, option, method, or plan in the following description are for the convenience of explanation and should not be interpreted as implying that each necessarily constitutes an independent invention or that each must necessarily be implemented individually. Furthermore, in describing each section, embodiment, example, option, method, or plan, if there are no explicitly conflicting or opposing technologies, it can be inferred / interpreted that at least some of them may be combined and implemented together, or that at least some may be omitted.

[0041] In a wireless communication system, a terminal receives information from a base station via a downlink (DL) and transmits information to the base station via an uplink (UL). The information transmitted and received by the base station and the terminal includes data and various control information, and various physical channels exist depending on the type and purpose of the information they transmit and receive.

[0042] <Abbreviations / Terms>

[0043] - IAB: Integrated Access and Backhaul

[0044] - CSI-RS: Channel State Information Reference Signal

[0045] - DgNB: Donor gNB

[0046] - AC: Access

[0047] - BH: Backhaul

[0048] - DU: Distributed Unit

[0049] - MT: Mobile terminal

[0050] - CU: Centralized Unit

[0051] - IAB-MT: IAB mobile terminal

[0052] - NGC: Next-Generation Core network

[0053] - SA: Stand-alone

[0054] - NSA: non-stand-alone

[0055] - EPC: Evolved Packet Core

[0056] - IAB-node: A RAN node that supports UE wireless access and forwards access traffic via wireless backhaul.

[0057] - IAB-donor: A RAN node that provides terminal interfaces to the core network and wireless backhaul functions to IAB nodes.

[0058] - LTM: L1 / L2-triggered mobility

[0059] - L1: Layer 1, meaning Physical layer. For example, PDCCH (DCI) is one of the downlink L1 signals.

[0060] - L2: Layer 2, meaning MAC layer. For example, MAC CE included in PDSCH is one of the downlink L2 signals.

[0061] FIG. 1 is a diagram illustrating physical channels used in 3GPP NR systems and a general signal transmission method using them.

[0062] When a terminal is turned on again after being turned off, or when it newly enters a cell, it performs an initial cell search operation, such as synchronizing with a base station in step S101. To do this, the terminal receives a Synchronization Signal Block (SSB) from the base station. The SSB includes a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH). Based on the PSS / SSS, the terminal synchronizes with the base station and obtains information such as the cell identity. Additionally, the terminal can obtain in-cell broadcast information based on the PBCH. Meanwhile, during the initial cell search phase, the terminal can receive a Downlink Reference Signal (DL RS) to check the downlink channel status.

[0063] After completing the initial cell search, the terminal can obtain more specific system information by receiving the Physical Downlink Control Channel (PDCCH) and the Physical Downlink Shared Channel (PDSCH) based on the Physical Downlink Control Channel information in step S102.

[0064] Subsequently, the terminal may perform a Random Access Procedure, such as steps S103 through S106, to complete the connection to the base station. To this end, the terminal may transmit a preamble through a Physical Random Access Channel (PRACH) (S103) and receive a response message for the preamble through a Physical Downlink Control Channel and a corresponding Physical Downlink Shared Channel (S104). In the case of contention-based random access, a Contention Resolution Procedure may be performed, such as transmitting an additional Physical Random Access Channel (S105) and receiving a Physical Downlink Control Channel and a corresponding Physical Downlink Shared Channel (S106).

[0065] A terminal that has performed the procedure described above may subsequently perform the reception of a physical downlink control channel / physical downlink shared channel (S107) and the transmission of a physical uplink shared channel (PUSCH) / physical uplink control channel (PUCCH) (S108) as a general uplink / downlink signal transmission procedure. The control information transmitted by the terminal to the base station is collectively referred to as Uplink Control Information (UCI). UCI includes HARQ ACK / NACK (Hybrid Automatic Repeat and reQuest Acknowledgement / Negative-ACK), SR (Scheduling Request), CSI (Channel State Information), etc. CSI includes CQI (Channel Quality Indicator), PMI (Precoding Matrix Indicator), RI (Rank Indication), etc. UCI is generally transmitted via PUCCH, but if control information and traffic data need to be transmitted simultaneously, it may be transmitted via PUSCH. In addition, UCI can be transmitted non-periodically via PUSCH in response to network requests / instructions.

[0066] Figure 2 illustrates the structure of a radio frame. In NR, uplink and downlink transmissions consist of frames. Each radio frame has a length of 10 ms and is divided into two 5 ms half-frames (HF). Each half-frame is divided into five 1 ms subframes (SF). Subframes are divided into one or more slots, and the number of slots within a subframe depends on the subcarrier spacing (SCS). Each slot contains 12 or 14 Orthogonal Frequency Division Multiplexing (OFDM) symbols depending on the cyclic prefix (CP). When a normal CP is used, each slot contains 14 OFDM symbols. When an extended CP is used, each slot contains 12 OFDM symbols.

[0067] Table 1 illustrates how the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary depending on the SCS when a standard CP is used.

[0068] SCS (15*2^u)N slot symb N frame,u slot N subframe,u slot 15KHz (u=0)1410130KHz (u=1)1420260KHz (u=2)14404120KHz (u=3)14808240KHz (u=4)1416016

[0069] * N slot symb : Number of symbols in the slot

[0070] * N frame,u slot : Number of slots in the frame

[0071] * N subframe,u slot : Number of slots in the subframe

[0072] Table 2 illustrates how the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary depending on the SCS when an extended CP is used.

[0073] SCS (15*2^u)N slot symb N frame,u slot N subframe,u slot 60KHz (u=2)12404

[0074] The frame structure is merely an example, and the number of subframes, slots, and symbols within the frame can be varied.

[0075] In an NR system, the OFDM numerology (e.g., SCS) can be configured differently among multiple cells merged into a single terminal. Accordingly, the (absolute time) intervals of a time resource (e.g., SF, slot, or TTI) (collectively referred to as TU (Time Unit) for convenience) composed of the same number of symbols can be configured differently among the merged cells. Here, the symbols may include OFDM symbols (or CP-OFDM symbols) and SC-FDMA symbols (or Discrete Fourier Transform-spread-OFDM, DFT-s-OFDM symbols).

[0076] FIG. 3 illustrates a resource grid of slots. A slot contains multiple symbols in the time domain. For example, in the case of a standard CP, one slot contains 14 symbols, whereas in the case of an extended CP, one slot contains 12 symbols. A carrier contains multiple subcarriers in the frequency domain. A Resource Block (RB) is defined as multiple (e.g., 12) consecutive subcarriers in the frequency domain. A Bandwidth Part (BWP) is defined as multiple consecutive Physical Blocks (PRB) in the frequency domain and can correspond to a single numerology (e.g., SCS, CP length, etc.). A carrier can contain up to N (e.g., 5) BWPs. Data communication is performed through the active BWPs, and only one BWP can be active for a single terminal. Each element in the resource grid is referred to as a Resource Element (RE), and a single complex symbol can be mapped to it.

[0077] FIG. 4 illustrates an example where physical channels are mapped within a slot. PDCCH can be transmitted in the DL control area, and PDSCH can be transmitted in the DL data area. PUCCH can be transmitted in the UL control area, and PUSCH can be transmitted in the UL data area. GP provides a time gap during the process of the base station and the terminal switching from transmit mode to receive mode or from receive mode to transmit mode. Some symbols at the time of transition from DL to UL within a subframe can be set as GP.

[0078] Below, each physical channel is explained in more detail.

[0079] The PDCCH carries Downlink Control Information (DCI). For example, the PCCCH (i.e., DCI) carries the transmission format and resource allocation for the DL-SCH (downlink shared channel), resource allocation information for the UL-SCH (uplink shared channel), paging information for the PCH (paging channel), system information on the DL-SCH, resource allocation information for higher-layer control messages such as random connection acknowledgments transmitted over the PDSCH, transmission power control commands, and the activation / deactivation of the CS (Configured Scheduling). The DCI includes a Cyclic Redundancy Check (CRC), which is masked or scrambled with various identifiers (e.g., Radio Network Temporary Identifier, RNTI) depending on the owner or use of the PDCCH. For example, if the PDCCH is for a specific terminal, the CRC is masked with the terminal identifier (e.g., Cell-RNTI, C-RNTI). If PDCCH is for paging, the CRC is masked by P-RNTI (Paging-RNTI). If PDCCH is for system information (e.g., System Information Block, SIB), the CRC is masked by SI-RNTI (System Information RNTI). If PDCCH is for a random access response, the CRC is masked by RA-RNTI (Random Access-RNTI).

[0080] A PDCCH consists of 1, 2, 4, 8, or 16 Control Channel Elements (CCEs) depending on the Aggregation Level (AL). A CCE is a logical allocation unit used to provide a PDCCH of a specified code rate according to the radio channel conditions. A CCE consists of 6 Resource Element Groups (REGs). A REG is defined by one OFDM symbol and one (P)RB. A PDCCH is transmitted via a Control Resource Set (CORESET). A CORESET is defined as a set of REGs with a given pneumonology (e.g., SCS, CP length, etc.). Multiple CORESETs for a single terminal may overlap in the time / frequency domain. A CORESET can be configured via system information (e.g., Master Information Block, MIB) or terminal-specific (UE-specific) upper-layer signaling (e.g., Radio Resource Control, RRC layer). Specifically, the number of RBs and the number of OFDM symbols (up to 3) constituting the CORESET can be set by the upper layer signaling.

[0081] PDSCH carries downlink data (e.g., DL-SCH transport block, DL-SCH TB), and modulation methods such as QPSK (Quadrature Phase Shift Keying), 16 QAM (Quadrature Amplitude Modulation), 64 QAM, and 256 QAM are applied. A codeword is generated by encoding the TB. PDSCH can carry up to two codewords. Scrambling and modulation mapping are performed for each codeword, and the modulation symbols generated from each codeword can be mapped to one or more layers. Each layer is mapped to a resource along with the DMRS (Demodulation Reference Signal) to generate an OFDM symbol signal, which is then transmitted through the corresponding antenna port.

[0082] PUCCH carries UCI (Uplink Control Information). UCI includes at least one of the following:

[0083] - SR(Scheduling Request): Information used to request UL-SCH resources.

[0084] - HARQ (Hybrid Automatic Repeat reQuest)-ACK (Acknowledgement): This is an acknowledgment for a downlink data packet (e.g., codeword) on the PDSCH. It indicates whether the downlink data packet was successfully received. A 1-bit HARQ-ACK is transmitted in response to a single codeword, and a 2-bit HARQ-ACK can be transmitted in response to two codewords. The HARQ-ACK response includes a positive ACK (simply ACK), a negative ACK (NACK), a DTX, or a NACK / DTX. Here, HARQ-ACK is used interchangeably with HARQ ACK / NACK and ACK / NACK.

[0085] - CSI (Channel State Information): This is feedback information regarding the downlink channel. MIMO (Multiple Input Multiple Output) related feedback information includes RI (Rank Indicator) and PMI (Precoding Matrix Indicator).

[0086] PUSCH carries uplink data (e.g., UL-SCH transport block, UL-SCH TB) and / or uplink control information (UCI) and is transmitted based on a CP-OFDM (Cyclic Prefix - Orthogonal Frequency Division Multiplexing) waveform or a DFT-s-OFDM (Discrete Fourier Transform - spread - Orthogonal Frequency Division Multiplexing) waveform. When PUSCH is transmitted based on a DFT-s-OFDM waveform, the terminal transmits PUSCH by applying transform precoding. For example, if transform precoding is disabled, the terminal transmits PUSCH based on a CP-OFDM waveform, and if transform precoding is enabled, the terminal can transmit PUSCH based on a CP-OFDM waveform or a DFT-s-OFDM waveform. PUSCH transmissions can be dynamically scheduled by UL grants within DCI or semi-statically scheduled based on upper layer (e.g., RRC) signaling (and / or Layer 1 (L1) signaling (e.g., PDCCH)) configured grants. PUSCH transmissions can be performed in a codebook-based or non-codebook-based manner.

[0087] Figure 5 shows an example of a CSI-related procedure.

[0088] The terminal receives configuration information related to CSI from the base station via RRC signaling (710). The configuration information related to CSI may include at least one of CSI-IM (interference management) resource information, CSI measurement configuration information, CSI resource configuration information, CSI-RS resource information, or CSI report configuration information.

[0089] - A CSI-IM resource may be configured for interference measurement (IM) of a terminal. In the time domain, the CSI-IM resource set may be configured periodic, semi-permanent, or non-periodic. The CSI-IM resource may be configured as Zero Power (ZP)-CSI-RS for the terminal. ZP-CSI-RS may be configured separately from Non-Zero Power (NZP)-CSI-RS.

[0090] - UE can assume that the CSI-RS resource(s) for channel measurement set for one CSI reporting and the CSI-IM / NZP CSI-RS resource(s) for interference measurement (when NZP CSI-RS resource(s) are used for interference measurement) have a QCL relationship with respect to 'QCL-TypeD' on a resource-by-resource basis.

[0091] - The CSI resource configuration may include at least one of a CSI-IM resource for interference measurement, an NZP CSI-RS resource for interference measurement, and an NZP CSI-RS resource for channel measurement. The CMR (channel measurement resource) may be an NZP CSI-RS for CSI acquisition, and the IMR (Interference measurement resource) may be an NZP CSI-RS for CSI-IM and IM.

[0092] - CSI-RS may be configured for one or more terminals. Different CSI-RS configurations may be provided for each terminal, or the same CSI-RS configuration may be provided for multiple terminals. CSI-RS may support up to 32 antenna ports. CSI-RS corresponding to N (N is 1 or more) antenna ports may be mapped to N RE positions within a time-frequency unit corresponding to one slot and one RB. If N is 2 or more, N-port CSI-RS may be multiplexed using CDM, FDM, and / or TDM methods. CSI-RS may be mapped to the remaining REs, excluding the REs to which CORESET, DMRS, and SSB are mapped. In the frequency domain, CSI-RS may be configured for the entire bandwidth, a portion of the bandwidth (BWP), or a portion of the bandwidth. CSI-RS may be transmitted at each RB within the configured bandwidth (i.e., density=1), or at every second RB (e.g., even or odd RB) (i.e., density=1 / 2). When CSI-RS is used as a Tracking Reference Signal (TRS), a single-port CSI-RS may be mapped to three subcarriers in each resource block (i.e., density=3). In the time domain, one or more CSI-RS resource sets may be configured for the terminal. Each CSI-RS resource set may include one or more CSI-RS configurations. Each CSI-RS resource set may be configured periodicly, semipersistently, or non-periodically.

[0093] - CSI report configuration may include settings for feedback type, measurement resources, report type, etc. NZP-CSI-RS resource sets may be used for the CSI report configuration of the terminal. NZP-CSI-RS resource sets may be associated with CSI-RS or SSB. Additionally, multiple periodic NZP-CSI-RS resource sets may be configured as TRS resource sets. (i) Feedback types may include Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI), CRI (CSI-RS Resource Indicator), SSBRI (SSB Resource block Indicator), LI (Layer Indicator), Rank Indicator (RI), Layer 1-Reference Signal Received Strength (RSRP), etc. (ii) Measurement resources may include settings for downlink signals and / or downlink resources for which the terminal performs measurements to determine feedback information. Measurement resources may be set as ZP and / or NZP CSI-RS resource sets associated with CSI reporting settings. NZP CSI-RS resource sets may include CSI-RS sets or SSB sets. For example, L1-RSRP may be measured against CSI-RS sets or against SSB sets. (iii) Report type may include settings for the timing and uplink channel, etc. for which the terminal performs reporting. Report timing may be set to periodic, semi-persistent, or non-periodic. Periodic CSI reporting may be transmitted over PUCCH. Semi-persistent CSI reporting may be transmitted over PUCCH or PUSCH based on MAC CE indicating activation / deactivation. Non-periodic CSI reporting may be indicated by DCI signaling.For example, the CSI request field of an uplink grant can specify one of various report trigger sizes. Non-periodic CSI reports can be transmitted over PUSCH.

[0094] The terminal measures the CSI based on configuration information related to the CSI. The CSI measurement may include a procedure for receiving the CSI-RS (720) and acquiring the CSI (730) by computing the received CSI-RS.

[0095] The terminal can transmit CSI reports to the base station (740). For CSI reporting, the time and frequency resources available to the UE are controlled by the base station. The channel state information (CSI) may include at least one of a channel quality indicator (CQI), a precoding matrix indicator (PMI), a CSI-RS resource indicator (CRI), an SS / PBCH block resource indicator (SSBRI), a layer indicator (LI), a rank indicator (RI), an L1-RSRP, and / or an L-SINR.

[0096] The time domain behavior of CSI reporting supports periodic, semi-persistent, and aperiodic. i) Periodic CSI reporting is performed on short PUCCH or long PUCCH. The periodicity and slot offset of periodic CSI reporting can be set to RRC; refer to CSI-ReportConfig IE. ii) Semi-periodic (SP) CSI reporting is performed on short PUCCH, long PUCCH, or PUSCH. In the case of SP CSI on short / long PUCCH, the periodicity and slot offset are set to RRC, and CSI reporting is activated / deactivated by separate MAC CE / DCI. In the case of SP CSI on PUSCH, the periodicity of SP CSI reporting is set to RRC, but the slot offset is not set to RRC, and SP CSI reporting is activated / deactivated by DCI (format 0_1). For SP CSI reporting over PUSCH, a separate RNTI (SP-CSI C-RNTI) is used. The timing of the initial CSI report follows the PUSCH time domain allocation value specified in the DCI, while subsequent CSI reporting timing follows the period set by the RRC. DCI format 0_1 ​​includes a CSI request field and can activate / deactivate specific configured SP-CSI trigger states. SP CSI reporting has the same or similar activation / deactivation mechanisms as those used for data transmission over SPS PUSCH.iii) aperiodic CSI reporting is performed on PUSCH and triggered by DCI. In this case, information related to the trigger of aperiodic CSI reporting can be transmitted / instructed / set via MAC-CE. For an AP CSI with AP CSI-RS, the AP CSI-RS timing is set by RRC, and the timing for AP CSI reporting is dynamically controlled by DCI.

[0097] L1-RSRP / L1-SINR Measurement and Reporting

[0098] The terminal can be configured to measure based on CSI-RS resources, SS / PBCH block resources, or both to calculate L1-RSRP. In this case, each resource may have a quasi-co-location relationship with type-C and type-D on a resource-by-resource basis as needed.

[0099] The terminal can configure up to 16 sets of CSI-RS resources, and each set can contain up to 64 CSI-RS resources. The total number of resources is limited to 128 or fewer.

[0100] When the above terminal reports the L1-RSRP value, it may report in one of the following ways depending on the setting of the upper layer parameters nrofReportedRS, nrOfReportedCells, or nrOfReportedRS-PerCell:

[0101] - Single value report: Reports as a 7-bit value quantized to 1 dB increments within the range of [-140, -44] dBm.

[0102] - Differential Reporting: Quantize the maximum value to 7 bits, and differentially quantize the remaining resources to 4 bits (2 dB increments) based on the maximum value.

[0103] Additionally, if group-based beam reporting is enabled, the CSI Resource Set and associated CRI / SSBRI of the resource that measured the largest L1-RSRP may be reported first.

[0104] Depending on whether the upper layer parameter timeRestrictionForChannelMeasurements is set, the terminal may be configured to calculate the L1-RSRP value based on the most recent measurement resource among SS / PBCH or NZP CSI-RS.

[0105] Additionally, if SSB-MTC-AdditionalPCI is configured in CSI-ReportConfig, CSI-SSB-ResourceSet for L1-RSRP reporting may include pairs of SSB indexes and PCI indexes.

[0106] If the above reporting amount setting is set to cri-RSRP-Index or ssb-Index-RSRP-Index, the terminal may also report a Capability Index indicating the maximum number of supported SRS antenna ports of the terminal along with the SSBRI / CRI and L1-RSRP values.

[0107] To calculate L1-SINR, the terminal may be configured to perform channel and interference measurements based on the following resources:

[0108] - Channel Measurement: NZP CSI-RS and / or SS / PBCH Block

[0109] - Interference measurement: NZP CSI-RS or CSI-IM

[0110] The resource configuration may include up to 16 sets of CSI-RS resources, and each set may include up to 64 CSI-RS or SS / PBCH Block resources.

[0111] The L1-SINR reporting method is as follows:

[0112] - Single value report: 7-bit value quantized to 0.5 dB increments in the [-23, 40] dB range

[0113] - Differential Reporting: The maximum value is quantized to 7 bits, and the remaining resources are differentially quantized to 4 bits (1 dB unit) based on the maximum value.

[0114] When NZP CSI-RS is used for channel / interference measurements, correction values ​​such as powerControlOffset defined in the upper layer are not applied.

[0115] In addition, depending on whether timeRestrictionForChannelMeasurements and timeRestrictionForInterferenceMeasurements are set, the terminal may be configured to calculate measurements based on the latest measurement resources.

[0116] If the above reporting amount setting is set to cri-SINR-Index or ssb-Index-SINR-Index, a Capability Index indicating the maximum number of supported SRS antenna ports of the terminal may be reported along with the SSBRI / CRI and L1-SINR values.

[0117] The terminal may be configured to perform CSI-RS-based radio resource measurement (RRM) according to the above CSI-RS-ResourceConfigMobility information element. The configuration may include the following:

[0118] - List of cells to be measured (csi-RS-CellList-Mobility)

[0119] - Cell identifier (cellId), measurement bandwidth (nrofPRBs, startPRB), resource density (density), CSI-RS resource list

[0120] - Configure CSI-RS index, period and slot offset (slotConfig), frequency and time domain allocation, sequence ID, etc. for each CSI-RS resource

[0121] In particular, if the CSI-RS resource includes an associatedSSB field, the resource may be measured based on the timing of the associated SS / PBCH block, and if it does not include one, the timing reference may be set based on the serving cell or refServCellIndex.

[0122] slotConfig includes periodicity in milliseconds and slot-unit offset based on the subcarrier interval, which defines the transmission timing of CSI-RS resources.

[0123] LTM- Lower-layer (eg, L1 / L2) Triggered Mobility

[0124] 5G communication systems aim to support very high data transfer rates and low transmission latency to support various services. When a terminal moves from the coverage area of ​​one cell to another, a serving cell handover must be performed at some point; prior to 5G NR Release 18, serving cell handovers were performed via L3 measurement. In L3 handovers, handover command messages are relatively large, which can cause signal overhead and latency due to retransmissions required as the UE moves away from the source gNB, potentially leading to the handover being triggered too late. This can result in the wireless link to the source gNB being disconnected before the handover is performed, causing the UE to undergo recovery procedures and leading to prolonged service interruptions. Such handover downtime can cause performance degradation for services requiring low latency, such as Time-Critical Communication (TCC) or Ultra-Reliable Low-Latency Communication (URLLC) (e.g., Extended Reality (XR) applications in the cloud, remote control, or mobility automation).

[0125] In 5G NR Release 18, Lower-layer Triggered Mobility (LTM) was introduced to address the issues associated with L3 handover. The core concept of LTM is to detect mobility at the physical layer (L1) or data link layer (L2) and provide a trigger mechanism that allows for faster handover processing. This enables the minimization of latency and packet loss by rapidly detecting and processing handoffs at lower layers before going through the complex procedures of L3 handover. Consequently, LTM has established itself as a key technology that resolves the problems of existing L3 handover while ensuring high-speed mobility and stability in 5G networks.

[0126] LTM is a procedure that receives an L1 layer (PHY) measurement report from a terminal (UE) and, based on this, allows the terminal's serving cell to be changed according to a cell switch command signaled by the base station via MAC CE. The cell switch command instructs an LTM candidate configuration that the base station has prepared in advance and provided to the terminal via an RRC signal, and the terminal performs a switch to the target configuration in accordance with the command. The LTM procedure can be used to reduce mobility delay.

[0127] When configured by the network, TCI states for one or more cells different from the current serving cell can be pre-activated. For example, the TCI states of LTM candidate cells can be pre-activated before they become serving cells. This allows the terminal to maintain down-synchronization with those cells, enabling faster switching when a cell switch is triggered. When an LTM cell switch is executed, all other activated TCI states are deactivated, except for the TCI state received in the cell switch command.

[0128] Additionally, if configured by the network, the UL TA (Timing Advance) acquisition procedure (Early TA) can be initiated for one or more cells different from the current serving cell. If the cell is N, which is the same as the current serving cells TA Have a value or N TA If is 0, prior TA acquisition is not required. The network may request the terminal to perform early TA acquisition for specific candidate cells prior to cell switching. This early TA acquisition procedure may be triggered by a PDCCH command or performed via terminal-based TA measurement configured by the RRC. In the former case, the BS or BS-DU to which the candidate cell belongs calculates the TA value and transmits it to the BS or BS-DU to which the serving cell belongs via the BS-CU. The serving cell includes the corresponding TA value within the MAC CE of the LTM cell switch command and transmits it to the terminal. In the latter case, the terminal performs TA measurement independently for candidate cells configured by the RRC, and the timing of such measurement is determined by the terminal implementation. If the terminal receives the cell switch command and a valid TA value is not included, it may perform LTM without a random access procedure (RACH-less) by applying the TA value it measured itself. Additionally, the network may include the TA value within the MAC CE of the cell switch command without the early TA acquisition procedure.

[0129] Depending on whether a valid TA value exists, the terminal performs a RACH-less LTM or a RACH-based LTM cell switch. If the cell switch command includes a valid TA value, the terminal applies that value according to network instructions. If terminal-based TA measurement is configured but the cell switch command does not include a valid TA value, the terminal may apply a valid TA value measured by itself. If a valid TA value exists, the terminal performs a RACH-less LTM cell switch, and otherwise performs a RACH-based LTM cell switch.

[0130] Regardless of whether terminal-based TA measurement is configured for a specific candidate cell, the terminal can still perform random access procedures for candidate cells according to the PDCCH command. This applies equally to candidate cells from which the terminal can derive TA values ​​itself. Additionally, even if the terminal has already performed random access to candidate cells, it must follow the terminal-based measurement configuration configured by the network.

[0131] In the case of RACH-less LTM, the terminal connects to the target cell using a configured grant (CG) or a dynamic grant (DG). The CG is included in the LTM candidate configuration, and the terminal selects a grant opportunity associated with the beam indicated by the cell switch command. When the LTM cell switch to the target cell begins, the terminal starts PDCCH monitoring for dynamic scheduling in the target cell. Until the RACH-less LTM procedure is complete, the terminal must not trigger random access if there are no valid PUCCH resources for the triggered SR.

[0132] LTM supports intra-BS-DU and inter-BS-DU mobility within the same BS-CU. It also supports both intra-frequency and inter-frequency mobility, including mobility to frequencies other than the currently serving cell. LTM is supported only for licensed spectrum. The following scenarios are supported:

[0133] - PCell changes in non-CA and non-DC scenarios

[0134] - Changes to PCell and SCell in the CA scenario

[0135] - Dual connectivity scenario: PCell and MCG SCell change, PSCell and SCG SCell change within SN (no MN involvement). However, simultaneous change of PCell and PSCell is not supported in LTM.

[0136] While the terminal stores LTM candidate configurations, it can perform all L3 handovers except DAPS handovers. In L3 handover-related RRC messages applied by the terminal, the target cell may add, modify, or remove LTM candidate configurations.

[0137] The cell switch command is transmitted through a MAC control element (MAC CE) containing the information necessary to perform an LTM cell switch.

[0138] Subsequently, LTM is performed by repeating the steps of initial synchronization, LTM cell switch execution, and LTM cell switch completion, without releasing other stored LTM candidate configurations even after each LTM cell switch is completed. General procedures on the wireless interface are also applicable to SCG LTM.

[0139] Figure 6 illustrates an example of an LTM procedure.

[0140] Referring to FIG. 6, the terminal (UE) transmits a MeasurementReport message to the base station (gNB). The base station determines the LTM setting and initiates the LTM preparation procedure (501).

[0141] The base station sends an RRC reconfiguration message containing LTM candidate configurations to the terminal (502).

[0142] The terminal saves the LTM candidate configuration and sends an RRC Reconfiguration Complete message to the base station (503).

[0143] The terminal performs down-synchronization (DL synchronization) with LTM candidate cells before receiving a cell switch command. The terminal can enable or disable the TCI status of the LTM candidate cells according to a trigger from the base station (504a).

[0144] The terminal may perform uplink synchronization (UL synchronization) with LTM candidate cells prior to receiving a cell switch command, either through terminal-based TA measurement or by transmitting a preamble triggered by the base station, if configured. If terminal-based TA measurement is configured, the terminal obtains the TA values ​​for the candidate cells by measurement (504b). If requested by the network, the terminal performs pre-TA acquisition with the candidate cells. In this case, a CFRA is triggered by a PDCCH command from the source cell, and the terminal transmits a preamble to the designated candidate cell. To minimize data interruption in the source cell due to the CFRA for the candidate cells, the terminal does not receive a random access response from the network for the purpose of obtaining the TA value, and the TA value of the candidate cell is specified within the cell switch command. The terminal does not maintain a TA timer for the candidate cell, and TA validity guarantees depend on the network implementation.

[0145] The terminal performs L1 measurements on the configured LTM candidate cells and transmits the L1 measurement report to the base station (505). L1 measurements must be performed while RRC reconfiguration (step 502) is active.

[0146] The base station determines the cell switch to the target cell and transmits an LTM cell switch command MAC CE that triggers the cell switch (506). This command includes a target configuration ID indicating the candidate configuration index of the target cell, a beam indicated by a TCI state or multiple beams indicated by a DL / UL TCI state, and, if possible, a TA command for the target cell. The terminal switches to the target cell according to the indicated target configuration ID and applies the candidate configuration.

[0147] If the terminal does not have a valid TA value for the target cell, the terminal performs a random access procedure for the target cell (507).

[0148] The terminal completes the LTM cell switch procedure by sending an RRCReconfigurationComplete message to the target cell (508). If the terminal performs a random access procedure in step 507, the LTM cell switch execution is considered to have been successfully completed when the random access procedure is successfully completed. In the case of RACH-less LTM, the terminal considers the LTM cell switch execution to have been completed when it determines that the first UL data has been successfully received by the network.

[0149] Steps 504 through 508 can be performed iteratively using the LTM candidate configuration provided in Step 502.

[0150] The procedure on the wireless interface shown in Fig. 6 can be applied to both intra-BS-DU LTM and inter-BS-DU LTM.

[0151] For LTM and L1 measurement reporting, 1) LTM-CSI-ResourceConfig information elements and 2) LTM-CSI-ReportConfig information elements may be provided to the terminal through upper layer signals.

[0152] 1) The LTM-CSI-ResourceConfig information element may be configured to define one or more CSI resource groups associated with one or more LTM candidate configurations. LTM-CSI-ResourceConfig may include ltm-CSI-ResourceConfigId-r18 and ltm-CSI-SSB-ResourceSet-r18. ltm-CSI-SSB-ResourceSet-r18 is a set comprising multiple SS / PBCH block resources and LTM candidate identifiers associated therewith, and includes the following items:

[0153] ltm-CSI-SSB-ResourceList-r18: An index list identifying one or more SS / PBCH block resources, which can be configured across different LTM candidate cells.

[0154] ltm-CandidateIdList-r18: This is a list of LTM candidate cell IDs corresponding to each SSB resource. It is configured such that the first candidate cell ID is linked to the first SSB index, and the second candidate cell ID is linked to the second SSB index.

[0155] 2) LTM-CSI-ReportConfig is an information element for configuring LTM-related CSI-based measurement reporting performed for a specific cell, and the reporting target cell is defined as the cell containing the LTM-CSI-ReportConfig.

[0156] LTM-CSI-ReportConfig may include the following: (i) ltm-CSI-ReportConfigId-r18, (ii) ltm-ResourcesForChannelMeasurement-r18 (represents the reference CSI resource configuration for measurement and is identified by LTM-CSI-ResourceConfigId), (iii) ltm-ReportConfigType-r18 (periodic / semiPersistentOnPUCCH / semiPersistentOnPUSCH / aperiodic), (iv) ltm-ReportContent-r18

[0157] ltm-ReportContent-r18 defines the content to be included in a single L1 measurement report instance and may include the following parameters.

[0158] - nrOfReportedCells-r18: Number of reported cells (e.g., 1–4)

[0159] - nrOfReportedRS-PerCell-r18: Number of reported RSs per cell (e.g., 1–4)

[0160] - spCellInclusion-r18: Defines whether to include the current serving cell (SpCell) in the report, and is configurable only if the SpCell is set as an LTM candidate.

[0161] CSI reference resource for LTM

[0162] In NR Rel-18, LTM procedures can be based on SSBs (SS / PBCH blocks). For example, a serving cell / base station provides information about the SSB of a candidate (e.g., neighbor) cell / base station to a terminal, and based on the results of the terminal measuring and reporting the SSB of the candidate cell / base station, an LTM cell switch determination and command is executed.

[0163] Meanwhile, SSB is generally transmitted with fewer resources / frequencies than CSI-RS in the frequency / time domain, and the beam applied to SSB may have coarse characteristics than the beam applied to CSI-RS. In order for measurement reporting and cell switch determination for LTM to be performed more accurately and efficiently, CSI-RS needs to be supported for LTM. In NR Rel-19, CSI acquisition for candidate cell(s) is being discussed to support LTM operation based on CSI-RS resources.

[0164] The following describes the LTM procedure based on CSI-RS and the related terminal / base station operations. Specifically, a method for setting and instructing the CSI reference resource for terminal LTM measurement is proposed.

[0165] Before describing the proposed content, we will look at the CSI reference resources defined in existing NR standards by referring to Table 3.

[0166]

[0167] As shown in Table 3, in existing NR standards, the CSI reference resource is defined for the serving cell, and the time domain slot location of the CSI reference resource is defined based on parameters such as the uplink slot location where the terminal is expected to report CSI to the base station, the CSI request slot location, CA slot offset, SCS configuration for DL / UL, and delay requirement. In addition, the time domain slot location of the CSI reference resource is restricted by the valid DL slot condition, which is determined based on the slot format of the serving cell.

[0168] The CSI reference resource defined in the existing NR standard is used as a reference for the location of the resource measured by the UE. The UE calculates the CSI reference resource based on the uplink slot location where the triggered CSI report is to be executed, and performs the report based on measurements of resources received prior to the CSI reference resource; however, if there is no resource indicated in the report configuration prior to the CSI reference resource, the UE does not perform the report. Additionally, if a channel (or interference) measurement time restriction is set, the UE performs and reports a one-shot measurement based on the most recent measurement resource prior to the CSI reference resource.

[0169] Meanwhile, at a recent standardization meeting, it was agreed to introduce a CSI report for CQI acquisition purposes (rather than L1-RSRP or L1-SINR) as a report quantity for LTM of candidate cell(s). For example, a terminal can measure CSI for candidate cell(s) configured for LTM and report it to the serving cell.

[0170] When measuring CSI for candidate cell(s), if the terminal measures the CSI resource by defining the CSI reference resource based on the serving cell as in the existing NR standard, there is a possibility of measuring an outdated resource, and the link quality may deteriorate after cell switching to the candidate cell.

[0171] In addition, the delay requirement used in existing NR standards to define the time domain location of a CSI reference resource creates ambiguity when the CSI report triggered for LTM is an inter-frequency measurement.

[0172] Considering these backgrounds and issues, this specification proposes a method for setting / determining / instructing CSI reference resource(s) for CSI reporting when a terminal receives CSI reporting for the measurement resources of candidate cell(s) for LTM purposes. The method for setting / determining / instructing CSI reference resource(s) described below may be applied to CSI reference resource(s) for LTM candidate cell(s). For example, when a terminal receives CSI reporting for the measurement resources of candidate cell(s) from a serving base station for LTM purposes, a method for the terminal to determine the CSI reference resource for CSI reporting is proposed.

[0173] [Proposal 1] Calculation of computation time gap for measurement reporting

[0174] In 3GPP NR Rel-18, when setting / instructing a CSI reference resource for a serving cell, in order to consider the time required for the terminal measuring the CSI resource to measure, calculate, and report the resource, a specific time (e.g., n) from the uplink slot where CSI reporting is expected (e.g., UL slot n' in Table 3) is taken into account (e.g., n CSI_ref + K offset * 2 uDL / 2 uKoffsetThe slot preceding by ) is defined as the time domain location of the CSI reference resource. Specifically, n CSI_ref The value defines the computation time gap, and for Periodic and Semi-persistent CSI reporting, n is based on the SCS configuration for DL. CSI_ref The value is calculated, and in the case of Aperiodic CSI reporting, n is based on the delay requirement Z'. CSI_ref A value is calculated. For example, the Z' value may be related to the time length from the last symbol of the CSI-RS resource to the first symbol of the CSI report. Specifically, Z' is determined based on the minimum value among the SCS of the PDCCH that received the CSI request, the SCS of the PUSCH that must report the CSI, and the SCS(s) of the AP CSI-RS(s) (TS 38.214 Clause 5.4).

[0175] Computation time gap (n) for measurement reporting when setting / instructing the CSI reference resource for the above-proposed candidate cell(s) CSI_ref To calculate the SCS considered for ) a method based on the SCS of the serving cell and a method based on the SCS of the candidate cell can be proposed. Each is described separately as option 1 and option 2.

[0176] Option 1) Calculate computation time gap based on serving cell SCS

[0177] Computation time gap (n) for measurement reporting on the measurement resources of the above-proposed candidate cell(s) CSI_refThe SCS considered to calculate ) can be determined based on the serving cell's SCS. As a specific example, in the case of Periodic and Semi-persistent CSI reporting, the computation time gap(n) is determined based on the serving cell's SCS configuration for DL. CSI_ref ) can be calculated. In the case of Aperiodic CSI reporting, it can be calculated based on the delay requirement Z', where Z' is determined based on the minimum value among the SCS of the PDCCH of the serving cell that received the CSI request, the SCS of the PUSCH of the serving cell that needs to report the CSI, and the SCS(s) of the AP CSI-RS(s).

[0178] Option 2) Receive SCS information of the corresponding cell from the candidate cell and calculate the computation time gap based on the SCS

[0179] For LTM, the terminal synchronizes DL / UL with multiple candidate cells as needed and, upon receiving a command, immediately switches to the corresponding cell to perform transmission and reception. Since the terminal has found a beam to service in the candidate cell, it can perform transmission and reception immediately after receiving a cell switch command, based on the configured or dynamic grant for that cell. Based on this background, the terminal can receive information related to the BWP to be used in the candidate cell (specifically, SCS information of the active BWP in that cell) and receive instructions for CSI reporting based on this information. Through this, the terminal can improve the link quality within the cell immediately after switching to the candidate cell.

[0180] Computation time gap (n) for measurement reporting on the measurement resources of the above-proposed candidate cell(s) CSI_refThe SCS considered for calculating ) can be calculated based on the candidate cell's SCS, and the cell's SCS information can be set / instructed from the serving cell to the terminal after being received by the serving cell from the candidate cell via the X2 interface. A specific example of how the terminal receives SCS information to be applied when reporting the CSI of LTM candidate cell(s) from the serving cell may be receiving it via RRC / MAC-CE / DCI signaling from the serving cell. And / or, the smallest SCS among all SCSs of all candidate cell(s) set for LTM and the serving cell's SCS can be applied to CSI reporting. As a specific example of how SCS information is applied to CSI reporting, in the case of Periodic and Semi-persistent CSI reporting, when one or more CSI-RS / SSBs are set for channel measurement, μ representing the candidate cell's SCS configuration for DL ​​is used for each. cellx, DL Considering 4*2^(μ cellx, DL ), 4*2^(μ cellx, DL The time domain location of the CSI reference resource can be defined by applying a slot offset of ). In the case of Aperiodic CSI reporting, it can be calculated based on the delay requirement Z', where Z' can be determined based on the minimum value among the SCS of the PDCCH that received the CSI request from the serving cell, the SCS of the PUSCH that needs to report the CSI to the serving cell, and the SCS(s) of the AP CSI-RS(s) received from the candidate cell.

[0181] In addition, a method may be proposed to define the SCS used when calculating the computation time gap differently depending on whether the terminal reports a specific capability. As a specific example, if the terminal reports "the capability of supporting inter-frequency measurements without gap" to the serving base station, the time gap can be calculated by applying the above options based on the smaller of the SCS of the terminal's serving cell and the SCS of the candidate cell.

[0182] [Proposal 2] Setting slot offset between serving cell and candidate cell(s)

[0183] In existing NR standards, regarding the setting / instruction of CSI reference resources for serving cells, an additional scheduling offset (e.g., K) in non-terrestrial network (NTN) scenarios is required. offset ) and slot offset during Carrier aggregation (CA) (e.g., N CA It is defined to calculate the CSI reference resource in the time domain considering slot and offset. In Table 3, K offset is a parameter for considering additional scheduling offsets for NTN, and K offset Cell-specific K broadcasted via SIB19 offset UE-specific K instructed by the Differential Koffset MAC CE command from the base station offset It is calculated as the sum of. Meanwhile, if it is not a CSI report for NTN, K offset The value is set to 0. N in Table 3 CAslot,offset defines the slot offset between PCell / PScell ​​and SCell to align frame boundaries during CA, and N CA slot,offset is determined based on the parameter ca-SlotOffset, which is set by RRC signaling, and the configured SCSs of the cells.

[0184] A method for setting a slot offset between a serving cell and a candidate cell can be proposed to define the location of a CSI reference resource in the time domain for setting / instructing the CSI reference resource for the above-mentioned candidate cell(s).

[0185] In the current LTM procedure, the terminal synchronizes DL / UL with multiple candidate cells in some cases prior to L1 measurement reporting (early DL / UL synchronization), and when it receives a Cell switch command (CSC) from the base station via MAC for the synchronized cell, it can immediately perform data transmission and reception based on the configured / dynamic grant to the cell without a RACH procedure. Based on this background, a method for setting a slot offset between a serving cell and a candidate cell to define the position of the CSI reference resource in the time domain may be proposed in such a way that the terminal's operation differs depending on whether the terminal performs Early sync with the corresponding candidate cell.

[0186] Scenario 1) Case where the terminal is expected to perform Early Sync with the cell transmitting the RS to be measured

[0187] When setting the slot offset between the serving cell and the candidate cell as proposed above, if it is expected that the terminal is performing Early Sync with the corresponding candidate cell, the terminal [requires] the above parameters (e.g., K offset and / or N CA slot,offset) for (K for candidate cells where Early Sync was performed offset and / or N CA The slot location of the CSI reference resource can be determined by applying the corresponding slot offset and calculating the value of n by replacing it with slot and offset parameters. At this time, the terminal can expect the base station to perform Early synchronization for the candidate cell by receiving a TCI activation setting / instruction for the candidate cell(s) from the base station and transmitting an ACK signal in response.

[0188] Scenario 2) Case where Early Sync of the terminal with the corresponding candidate cell is not expected

[0189] When setting the slot offset between the serving cell and the candidate cell as proposed above, if the terminal is not expected to perform Early Sync with the corresponding candidate cell, a separate Koffset value and / or SCS for Koffset value may be set for each candidate cell.

[0190] For example, cell-specific Koffset values ​​of the corresponding cell(s) can be received from the candidate cell(s), and when setting the slot offset between the serving cell and the candidate cell, the Koffset value can be defined as a single offset value that considers only the cell-specific Koffset and does not consider the UE-specific Koffset.

[0191] And / or, as a method for setting a slot offset between a serving cell and a candidate cell to define the position of the above CSI reference resource in the time domain, the terminal operation may be proposed differently from the existing NR standard, regardless of whether the terminal performs Early sync with the corresponding candidate cell. As a specific example, when the terminal calculates a CSI reference resource for candidate cell(s) for LTM purposes, the slot offset between the serving cell and the candidate cell may be considered as 0, and the slot position of the CSI reference resource may be determined.

[0192] [Proposal 3] Definition of valid DL slot condition

[0193] A method for setting conditions of a valid DL slot can be proposed to define the location of a CSI reference resource in the time domain for setting / instructing a CSI reference resource for the above-proposed candidate cell(s).

[0194] Referring to Table 3, according to the existing NR standard, the valid DL slot condition for a CSI reference resource for a Serving cell is a slot that satisfies the following two conditions.

[0195] - Includes at least one higher layer configured D / F symbol.

[0196] - It is not within the measurement gap set for the terminal.

[0197] Regarding the first condition mentioned above, existing standards define the condition based on the slot format set by the serving cell, but other conditions may be defined for setting / instructing the CSI reference resource for the proposed candidate cell(s).

[0198] Option A) A slot containing at least one configured D / F symbol(s) of a candidate cell

[0199] As mentioned in Proposal 1 above, the terminal may receive information related to the BWP to be used in the candidate cell and may be instructed to perform CSI reporting based on said information. As an example of BWP-related information, DL / Flexible symbol setting information of the candidate cell may be included. In this case, the DL / Flexible symbol setting information of the candidate cell may be used to determine whether the conditions of the valid DL slot are satisfied.

[0200] As a specific example, the following condition may be applied by replacing the first condition of the existing valid DL slot: (i) "Includes at least one higher layer configured D / F symbol of the corresponding candidate cell." (ii) Or, as another specific example, the following condition may be applied by modifying the first condition of the existing valid DL slot: "Includes at least one higher layer configured D / F symbol or a higher layer configured D / F symbol of the corresponding candidate cell." (iii) Or, as another specific example, the following condition may be applied by modifying the first condition of the existing valid DL slot: "Includes at least one higher layer configured D / F symbol common to the corresponding candidate cell and the serving cell." In this case, the serving cell may operate by receiving slot format information (as a specific example, intended TDD DL-UL configuration) expected to be used commonly between cells from the candidate cell via the X2 interface and then instructing the terminal.

[0201] Option B) A slot containing at least one configured D / F symbol(s) of a serving cell

[0202] To define the location of a CSI reference resource in the time domain for the proposed candidate cell(s), a slot containing at least one configured D / F symbol(s) of the serving cell can be defined as a condition for a valid DL slot. In this case, the terminal may be expected to receive resources for CSI reporting from the candidate cell limited to the symbol / slot location set as the D / F of the serving cell. The proposed method has the advantage of being implementable even without receiving information related to the BWP of the candidate cell(s).

[0203] Regarding the second condition mentioned above, existing standards define the condition as being outside the range where the measurement gap (MG), which is the range where the terminal excludes receiving the DL signal of the serving cell, is set in order to find a slot where the RS of the serving cell can be received; however, for setting / instructing the CSI reference resource for the proposed candidate cell(s), a different definition of the condition may be proposed.

[0204] Option 1) Do not apply MG interval conditions

[0205] For the setting / direction of a CSI reference resource for the proposed candidate cell(s) above, a condition for a valid DL slot to define the location of the CSI reference resource in the time domain may include a slot within the MG interval set from the serving cell. In existing standards, the condition for a valid DL slot of a CSI reference resource for a serving cell is constrained to be outside the configured MG interval, but such a condition may not apply to the determination of a valid DL slot of a CSI reference resource for a candidate cell(s).

[0206] And / or, valid DL slot(s) for defining the location in the time domain of a CSI reference resource for setting / instructing the CSI reference resource for the proposed candidate cell(s) may include slots within the LTM-purpose MG (hereinafter LTM-MG) interval set from the serving cell. In this case, terminal operation within the LTM-MG may be supported differently depending on the measurement purpose of the CSI-RS resource, and accordingly, the conditions for the valid DL slot of the CSI reference resource for the candidate cell(s) may also differ. For example, if the terminal is not expected to receive other DL signals other than the CSI-RS resource for beam reporting within the LTM-MG, the slot within the LTM-MG may not be determined as a valid DL slot.

[0207] Option 2) Operation based on whether the terminal has inter-freq. measurement without gap capability

[0208] For setting / instructing a CSI reference resource for the proposed candidate cell(s) above, a terminal having "the capability of supporting inter-frequency measurements without gap" as a condition for a valid DL slot to define the location of the CSI reference resource in the time domain can apply the above option 1 method as is.

[0209] And / or, a terminal without the above capability may not expect a slot outside the LTM-MG interval to be a valid DL slot for inter-frequency measurement.

[0210] FIG. 7 is a diagram illustrating operations performed by a terminal and a network according to one embodiment. FIG. 7 is an example of implementation based on at least some of the methods / options / proposals described above, and the previously described contents may be referenced to aid in understanding FIG. 7 even without separate explanation.

[0211] Referring to FIG. 7, the terminal can transmit a terminal capability report to the network (A05). The terminal capability report can be transmitted via upper layer signaling. The terminal capability report may include information about LTM-related candidate cell measurement capabilities that the terminal can support (e.g., inter-frequency measurements without gap).

[0212] The terminal can receive LTM-related configuration information from the network through at least one upper layer signaling (A10). For example, the LTM-related configuration information may include information about candidate cells for the LTM. The information about the candidate cells may include at least one of the BWP-related information, slot offset, and / or TDD UL-DL configuration information, and CSI-RS resource information of the candidate cells.

[0213] The terminal receives at least one CSI-RS from the corresponding cell (e.g., serving cell or LTM candidate cell) (A20) and can perform a measurement based thereon (A25). The terminal determines a CSI reference resource for the candidate cell and can measure the CSI based thereon.

[0214] The terminal can report CSI for LTE to the network (A30).

[0215] The terminal can receive a cell switch command from the network (A35). The cell switch command can be received via L1 and / or L2 signaling. For example, the cell switch command can be received via MAC CE.

[0216] The terminal can perform a cell switch to the corresponding candidate cell based on a cell switch command (A40).

[0217] FIG. 8 illustrates the flow of a method performed by a terminal according to one embodiment. FIG. 8 is an example of implementation based on at least some of the methods / options / proposals described above, and the previously described contents may be referenced to aid in understanding FIG. 8 without further explanation.

[0218] Referring to FIG. 8, the terminal can receive information about one or more candidate cells for LTM (L1 / L2-triggered mobility) from a serving cell (B05). The information about one or more candidate cells may include information about candidate cell SCS (subcarrier spacing).

[0219] The terminal can transmit a CSI report for LTM to the serving cell based on a CSI (channel state information) reference resource for one or more of the candidate cells (B10). The CSI reference resource may be determined based on information regarding the candidate cell SCS.

[0220] Information regarding the above candidate cell SCS may provide at least one of the DL (downlink) SCS or UL (uplink) SCS for each candidate cell.

[0221] The CSI reference resource can be determined based on the SCS having the smallest value within an SCS set that includes the SCSs of one or more of the above candidate cells.

[0222] The above CSI reference resource is a parameter (n) calculated based on information regarding the above candidate cell SCS. CSI_ref It can be determined based on ) and slot offset.

[0223] The above slot offset can be determined based on whether the terminal is synchronized to a specific candidate cell related to the above CSI reference resource.

[0224] Based on the fact that the terminal is synchronized with the specific candidate cell, the terminal can calculate the slot offset based on the specific candidate cell.

[0225] Based on the fact that the terminal is not synchronized with the specific candidate cell, a specific slot offset received from the serving cell can be used as the slot offset.

[0226] The above CSI reference resource may be associated with an effective DL (downlink) slot of a specific candidate cell.

[0227] The above valid DL slot may include at least one of the DL symbol or Flexible symbol of the specific candidate cell.

[0228] The information regarding one or more of the above candidate cells may include TDD (time divisional duplexing) UL (uplink)-DL setting information of the specific candidate cell.

[0229] The above TDD UL-DL configuration information may include information regarding the configuration of DL / Flexible / UL resources (e.g., slots or symbols) of the specific candidate cell.

[0230] The above effective DL slot can be located within the measurement gap set for LTM.

[0231] FIG. 9 illustrates the flow of a method performed by a base station according to one embodiment. FIG. 9 is an example of implementation based on at least some of the methods / options / proposals described above, and the previously described contents may be referenced to aid in understanding FIG. 9 without further explanation.

[0232] Referring to FIG. 9, the base station can transmit information about one or more candidate cells for LTM (L1 / L2-triggered mobility) through the terminal's serving cell (C05). The information about one or more candidate cells may include information about candidate cell SCS (subcarrier spacing).

[0233] The base station can receive a CSI (channel state information) report for LTM from the terminal through the serving cell (C10). The CSI report may relate to a CSI reference resource for one or more candidate cells. The CSI reference resource may be determined based on information regarding the candidate cell SCS.

[0234] Information regarding the above candidate cell SCS may provide at least one of the DL (downlink) SCS or UL (uplink) SCS for each candidate cell.

[0235] The CSI reference resource can be determined based on the SCS having the smallest value within an SCS set that includes the SCSs of one or more of the above candidate cells.

[0236] The above CSI reference resource can be determined based on the slot offset and the parameter (nCSI_ref) calculated based on the information regarding the above candidate cell SCS.

[0237] The above slot offset can be determined based on whether the terminal is synchronized to a specific candidate cell related to the above CSI reference resource.

[0238] Based on the fact that the terminal is synchronized with the specific candidate cell, the slot offset can be calculated based on the specific candidate cell.

[0239] Based on the fact that the terminal is not synchronized with the specific candidate cell, a specific slot offset indicated through the serving cell can be used as the slot offset.

[0240] The above CSI reference resource may be associated with an effective DL (downlink) slot of a specific candidate cell.

[0241] The above valid DL slot may include at least one of the DL symbol or Flexible symbol of the specific candidate cell.

[0242] The information regarding one or more of the above candidate cells may include TDD (time divisional duplexing) UL (uplink)-DL setting information of the specific candidate cell.

[0243] The above TDD UL-DL configuration information may include information regarding the configuration of DL / Flexible / UL resources (e.g., slots or symbols) of the specific candidate cell.

[0244] The above effective DL slot can be located within the measurement gap set for LTM.

[0245] FIG. 10 illustrates a communication system (1) applicable to the present disclosure.

[0246] Referring to FIG. 10, the communication system (1) includes a wireless device, a base station, and a network. Here, the wireless device refers to a device that performs communication using wireless access technology (e.g., 5G NR (New RAT), LTE (Long Term Evolution)) and may be referred to as a communication / wireless / 5G device. Although not limited thereto, the wireless device may include a robot (100a), a vehicle (100b-1, 100b-2), an XR (eXtended Reality) device (100c), a hand-held device (100d), a home appliance (100e), an IoT (Internet of Thing) device (100f), and an AI device / server (400). For example, the vehicle may include a vehicle equipped with wireless communication capabilities, an autonomous vehicle, a vehicle capable of performing inter-vehicle communication, etc. Here, the vehicle may include an Unmanned Aerial Vehicle (UAV) (e.g., a drone). XR devices include AR (Augmented Reality) / VR (Virtual Reality) / MR (Mixed Reality) devices and can be implemented in the form of HMDs (Head-Mounted Devices), HUDs (Head-Up Displays) equipped in vehicles, televisions, smartphones, computers, wearable devices, home appliances, digital signage, vehicles, robots, etc. Portable devices may include smartphones, smartpads, wearable devices (e.g., smartwatches, smart glasses), computers (e.g., laptops, etc.). Home appliances may include TVs, refrigerators, washing machines, etc. IoT devices may include sensors, smart meters, etc. For example, base stations and networks may be implemented as wireless devices, and a specific wireless device (200a) may operate as a base station / network node to other wireless devices.

[0247] Wireless devices (100a to 100f) can be connected to a network (300) through a base station (200). Artificial Intelligence (AI) technology may be applied to the wireless devices (100a to 100f), and the wireless devices (100a to 100f) can be connected to an AI server (400) through the network (300). The network (300) can be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. The wireless devices (100a to 100f) may communicate with each other through the base station (200) / network (300), but they may also communicate directly (e.g., sidelink communication) without going through the base station / network. For example, vehicles (100b-1, 100b-2) can communicate directly (e.g., V2V (Vehicle to Vehicle) / V2X (Vehicle to everything) communication). Also, IoT devices (e.g., sensors) can communicate directly with other IoT devices (e.g., sensors) or other wireless devices (100a to 100f).

[0248] Wireless communication / connection (150a, 150b, 150c) can be established between wireless devices (100a~100f) / base station (200) and base station (200) / base station (200). Here, wireless communication / connection can be achieved through various wireless access technologies (e.g., 5G NR), such as uplink / downlink communication (150a), sidelink communication (150b) (or D2D communication), and inter-base station communication (150c) (e.g., relay, IAB (Integrated Access Backhaul)). Through wireless communication / connection (150a, 150b, 150c), wireless devices and base stations / wireless devices, and base stations and base stations can transmit / receive wireless signals to / from each other. For example, wireless communication / connection (150a, 150b, 150c) can transmit / receive signals through various physical channels. To this end, based on various proposals of the present disclosure, at least some of the following may be performed: various configuration information setting processes for transmitting / receiving wireless signals, various signal processing processes (e.g., channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.), resource allocation processes, etc.

[0249] FIG. 11 illustrates a wireless device that can be applied to the present disclosure.

[0250] Referring to FIG. 11, the first wireless device (100) and the second wireless device (200) can transmit and receive wireless signals through various wireless access technologies (e.g., LTE, NR). Here, {the first wireless device (100), the second wireless device (200)} may correspond to {wireless device (100x), base station (200)} and / or {wireless device (100x), wireless device (100x)} of FIG. 10.

[0251] The first wireless device (100) includes one or more processors (102) and one or more memories (104), and may additionally include one or more transceivers (106) and / or one or more antennas (108). The processor (102) controls the memory (104) and / or transceivers (106) and may be configured to implement the descriptions, functions, procedures, proposals, methods and / or flowcharts of operation disclosed in this document. For example, the processor (102) may process information within the memory (104) to generate a first information / signal and then transmit a wireless signal containing the first information / signal through the transceiver (106). Additionally, the processor (102) may receive a wireless signal containing a second information / signal through the transceiver (106) and then store information obtained from the signal processing of the second information / signal in the memory (104). The memory (104) may be connected to the processor (102) and may store various information related to the operation of the processor (102). For example, the memory (104) may store software code containing instructions for performing some or all of the processes controlled by the processor (102) or for performing the descriptions, functions, procedures, proposals, methods, and / or operation sequence diagrams disclosed in this document. Here, the processor (102) and the memory (104) may be part of a communication modem / circuit / chip designed to implement wireless communication technology (e.g., LTE, NR). The transceiver (106) may be connected to the processor (102) and may transmit and / or receive wireless signals through one or more antennas (108). The transceiver (106) may include a transmitter and / or receiver. The transceiver (106) may be combined with an RF (Radio Frequency) unit. In the present disclosure, a wireless device may refer to a communication modem / circuit / chip.

[0252] The second wireless device (200) includes one or more processors (202) and one or more memories (204), and may additionally include one or more transceivers (206) and / or one or more antennas (208). The processor (202) controls the memory (204) and / or transceivers (206) and may be configured to implement the descriptions, functions, procedures, proposals, methods and / or operation sequences disclosed in this document. For example, the processor (202) may process information within the memory (204) to generate a third information / signal and then transmit a wireless signal containing the third information / signal through the transceiver (206). Additionally, the processor (202) may receive a wireless signal containing a fourth information / signal through the transceiver (206) and then store information obtained from the signal processing of the fourth information / signal in the memory (204). Memory (204) may be connected to the processor (202) and may store various information related to the operation of the processor (202). For example, memory (204) may store software code containing instructions for performing some or all of the processes controlled by the processor (202) or for performing the descriptions, functions, procedures, proposals, methods, and / or flowcharts of operation disclosed in this document. Here, the processor (202) and memory (204) may be part of a communication modem / circuit / chip designed to implement wireless communication technology (e.g., LTE, NR). A transceiver (206) may be connected to the processor (202) and may transmit and / or receive wireless signals through one or more antennas (208). The transceiver (206) may include a transmitter and / or receiver. The transceiver (206) may be interchangeable with an RF unit. In this disclosure, a wireless device may refer to a communication modem / circuit / chip.

[0253] Hereinafter, hardware elements of the wireless device (100, 200) will be described in more detail. Although not limited thereto, one or more protocol layers may be implemented by one or more processors (102, 202). For example, one or more processors (102, 202) may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). One or more processors (102, 202) may generate one or more Protocol Data Units (PDUs) and / or Service Data Units (SDUs) according to the descriptions, functions, procedures, proposals, methods, and / or flowcharts of operation disclosed in this document. One or more processors (102, 202) may generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or flowcharts of operation disclosed in this document. One or more processors (102, 202) may generate a signal (e.g., baseband signal) containing a PDU, SDU, message, control information, data, or information according to the functions, procedures, proposals, and / or methods disclosed in this document and provide it to one or more transceivers (106, 206). One or more processors (102, 202) may receive a signal (e.g., baseband signal) from one or more transceivers (106, 206) and may obtain a PDU, SDU, message, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or flowcharts disclosed in this document.

[0254] One or more processors (102, 202) may be referred to as a controller, microcontroller, microprocessor, or microcomputer. One or more processors (102, 202) may be implemented by hardware, firmware, software, or a combination thereof. For example, one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), one or more Digital Signal Processing Devices (DSPDs), one or more Programmable Logic Devices (PLDs), or one or more Field Programmable Gate Arrays (FPGAs) may be included in one or more processors (102, 202). The descriptions, functions, procedures, proposals, methods, and / or flowcharts disclosed in this document may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, etc. Firmware or software configured to perform the descriptions, functions, procedures, proposals, methods, and / or operation sequences disclosed in this document may be contained in one or more processors (102, 202) or stored in one or more memories (104, 204) and driven by one or more processors (102, 202). The descriptions, functions, procedures, proposals, methods, and / or operation sequences disclosed in this document may be implemented using firmware or software in the form of code, instructions, and / or sets of instructions.

[0255] One or more memories (104, 204) may be connected to one or more processors (102, 202) and may store various forms of data, signals, messages, information, programs, codes, instructions, and / or commands. One or more memories (104, 204) may be composed of ROM, RAM, EPROM, flash memory, hard drive, registers, cache memory, computer read storage media, and / or combinations thereof. One or more memories (104, 204) may be located inside and / or outside of one or more processors (102, 202). Additionally, one or more memories (104, 204) may be connected to one or more processors (102, 202) through various technologies such as wired or wireless connections.

[0256] One or more transceivers (106, 206) may transmit user data, control information, wireless signals / channels, etc., as mentioned in the methods and / or operation flowcharts, etc., of this document to one or more other devices. One or more transceivers (106, 206) may receive user data, control information, wireless signals / channels, etc., as mentioned in the descriptions, functions, procedures, proposals, methods and / or operation flowcharts, etc., disclosed in this document from one or more other devices. For example, one or more transceivers (106, 206) may be connected to one or more processors (102, 202) and may transmit and receive wireless signals. For example, one or more processors (102, 202) may control one or more transceivers (106, 206) to transmit user data, control information, or wireless signals to one or more other devices. Additionally, one or more processors (102, 202) may control one or more transceivers (106, 206) to receive user data, control information, or wireless signals from one or more other devices. Additionally, one or more transceivers (106, 206) may be connected to one or more antennas (108, 208), and one or more transceivers (106, 206) may be configured to transmit and receive user data, control information, wireless signals / channels, etc., as described in the descriptions, functions, procedures, proposals, methods, and / or flowcharts of operation disclosed in this document through one or more antennas (108, 208). In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers (106, 206) can convert the received wireless signal / channel, etc. from an RF band signal to a baseband signal in order to process the received user data, control information, wireless signal / channel, etc. using one or more processors (102, 202).One or more transceivers (106, 206) can convert user data, control information, wireless signals / channels, etc. processed using one or more processors (102, 202) from baseband signals to RF band signals. To this end, one or more transceivers (106, 206) may include (analog) oscillators and / or filters.

[0257] FIG. 12 illustrates another example of a wireless device to which the present disclosure applies. The wireless device may be implemented in various forms depending on the use—example / service (see FIG. 10).

[0258] Referring to FIG. 12, the wireless device (100, 200) corresponds to the wireless device (100, 200) of FIG. 11 and may be composed of various elements, components, units / parts, and / or modules. For example, the wireless device (100, 200) may include a communication unit (110), a control unit (120), a memory unit (130), and additional elements (140). The communication unit may include a communication circuit (112) and transceiver(s) (114). For example, the communication circuit (112) may include one or more processors (102, 202) and / or one or more memories (104, 204) of FIG. 11. For example, the transceiver(s) (114) may include one or more transceivers (106, 206) and / or one or more antennas (108, 208) of FIG. 11. The control unit (120) is electrically connected to the communication unit (110), the memory unit (130), and additional elements (140) and controls the general operation of the wireless device. For example, the control unit (120) may control the electrical / mechanical operation of the wireless device based on a program / code / command / information stored in the memory unit (130). Additionally, the control unit (120) may transmit information stored in the memory unit (130) to an external (e.g., another communication device) via a wireless / wired interface through the communication unit (110), or store information received from an external (e.g., another communication device) via a wireless / wired interface through the communication unit (110) in the memory unit (130).

[0259] The additional element (140) can be configured in various ways depending on the type of wireless device. For example, the additional element (140) may include at least one of a power unit / battery, an input / output unit (I / O unit), a driving unit, and a computing unit. Although not limited thereto, the wireless device may be implemented in the form of a robot (Fig. 10, 100a), a vehicle (Fig. 10, 100b-1, 100b-2), an XR device (Fig. 10, 100c), a portable device (Fig. 10, 100d), a home appliance (Fig. 10, 100e), an IoT device (Fig. 10, 100f), a digital broadcasting terminal, a hologram device, a public safety device, an MTC device, a medical device, a fintech device (or financial device), a security device, a climate / environment device, an AI server / device (Fig. 10, 400), a base station (Fig. 10, 200), a network node, etc. Wireless devices can be used in a movable or fixed location depending on the use—e.g., service.

[0260] In FIG. 12, various elements, components, units / parts, and / or modules within the wireless device (100, 200) may be entirely interconnected via a wired interface, or at least partially connected via a communication unit (110). For example, within the wireless device (100, 200), the control unit (120) and the communication unit (110) may be connected via a wire, and the control unit (120) and the first unit (e.g., 130, 140) may be connected wirelessly via the communication unit (110). Additionally, each element, component, unit / part, and / or module within the wireless device (100, 200) may include one or more additional elements. For example, the control unit (120) may be composed of one or more sets of processors. For example, the control unit (120) may be composed of a set of a communication control processor, an application processor, an Electronic Control Unit (ECU), a graphics processing processor, a memory control processor, etc. As another example, the memory unit (130) may be composed of RAM (Random Access Memory), DRAM (Dynamic RAM), ROM (Read Only Memory), flash memory, volatile memory, non-volatile memory and / or a combination thereof.

[0261] FIG. 13 illustrates a vehicle or autonomous vehicle to which the present disclosure applies. The vehicle or autonomous vehicle may be implemented as a mobile robot, vehicle, train, manned or unmanned aerial vehicle (AV), ship, etc.

[0262] Referring to FIG. 13, a vehicle or autonomous vehicle (100) may include an antenna unit (108), a communication unit (110), a control unit (120), a driving unit (140a), a power supply unit (140b), a sensor unit (140c), and an autonomous driving unit (140d). The antenna unit (108) may be configured as part of the communication unit (110). Blocks 110 / 130 / 140a to 140d each correspond to blocks 110 / 130 / 140 of FIG. 12.

[0263] The communication unit (110) can transmit and receive signals (e.g., data, control signals, etc.) with external devices such as other vehicles, base stations (e.g., base stations, roadside base stations (Roadside units), etc.), and servers. The control unit (120) can perform various operations by controlling elements of the vehicle or autonomous vehicle (100). The control unit (120) may include an Electronic Control Unit (ECU). The driving unit (140a) can drive the vehicle or autonomous vehicle (100) on the ground. The driving unit (140a) may include an engine, motor, power train, wheels, brakes, steering device, etc. The power supply unit (140b) supplies power to the vehicle or autonomous vehicle (100) and may include wired / wireless charging circuits, batteries, etc. The sensor unit (140c) can obtain vehicle status, surrounding environment information, user information, etc. The sensor unit (140c) may include an IMU (inertial measurement unit) sensor, a collision sensor, a wheel sensor, a speed sensor, an inclination sensor, a weight detection sensor, a heading sensor, a position module, a vehicle forward / reverse sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illuminance sensor, a pedal position sensor, etc. The autonomous driving unit (140d) may implement technologies such as maintaining the driving lane, technologies for automatically adjusting speed such as adaptive cruise control, technologies for automatically driving along a predetermined path, and technologies for automatically setting a path and driving when a destination is set.

[0264] For example, the communication unit (110) can receive map data, traffic information data, etc. from an external server. The autonomous driving unit (140d) can generate an autonomous driving path and a driving plan based on the acquired data. The control unit (120) can control the drive unit (140a) so that the vehicle or the autonomous vehicle (100) moves along the autonomous driving path according to the driving plan (e.g., speed / direction control). During autonomous driving, the communication unit (110) can acquire the latest traffic information data from an external server non-periodically and can acquire surrounding traffic information data from surrounding vehicles. Additionally, during autonomous driving, the sensor unit (140c) can acquire vehicle status and surrounding environment information. The autonomous driving unit (140d) can update the autonomous driving path and the driving plan based on the newly acquired data / information. The communication unit (110) can transmit information regarding the vehicle location, autonomous driving path, driving plan, etc. to an external server. An external server can predict traffic information data in advance using AI technology, etc., based on information collected from vehicles or autonomous vehicles, and can provide the predicted traffic information data to vehicles or autonomous vehicles.

[0265] The embodiments described above are combinations of the components and features of the present disclosure in a specific form. Each component or feature should be considered optional unless otherwise explicitly stated. Each component or feature may be implemented in a form not combined with other components or features. Additionally, it is possible to construct embodiments of the present disclosure by combining some components and / or features. The order of operations described in the embodiments of the present disclosure may be changed. Some components or features of one embodiment may be included in another embodiment, or may be replaced with corresponding components or features of another embodiment. It is obvious that embodiments may be constructed by combining claims that are not explicitly related in the claims, or that they may be included as new claims by amendment after filing.

[0266] It is obvious to those skilled in the art that the present invention may be embodied in other specific forms without departing from the features. Accordingly, the foregoing detailed description should not be interpreted restrictively in all respects but should be considered exemplary. The scope of the invention shall be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the invention are included within the scope of the invention.

[0267] The present disclosure may be used in a terminal, base station, or other equipment of a wireless mobile communication system.

Claims

1. In a method performed by a terminal, Receive information about one or more candidate cells for LTM (L1 / L2-triggered mobility) from a serving cell; and It includes transmitting a CSI report for LTM to the serving cell based on a CSI (channel state information) reference resource for one or more of the candidate cells mentioned above, and The information regarding one or more of the above candidate cells includes information regarding candidate cell SCS (subcarrier spacing), and A method in which the above CSI reference resource is determined based on information regarding the above candidate cell SCS.

2. In Paragraph 1, A method for providing information on the above candidate cell SCS, wherein at least one of a DL (downlink) SCS or an UL (uplink) SCS is provided for each candidate cell.

3. In Paragraph 1, A method in which the CSI reference resource is determined based on the SCS having the smallest value within an SCS set including the SCSs of one or more candidate cells.

4. In Paragraph 1, The above CSI reference resource is a parameter (n) calculated based on information regarding the above candidate cell SCS. CSI_ref Determined based on ) and slot offset, A method in which the slot offset is determined based on whether the terminal is synchronized to a specific candidate cell related to the CSI reference resource.

5. In Paragraph 4, A method in which the terminal calculates the slot offset based on the specific candidate cell, based on the terminal being synchronized with the specific candidate cell.

6. In Paragraph 4, A method in which a specific slot offset received from the serving cell is used as the slot offset based on the fact that the terminal is not synchronized with the specific candidate cell.

7. In Paragraph 1, The above CSI reference resource is a method related to the valid DL (downlink) slot of a specific candidate cell.

8. In Paragraph 7, A method in which the valid DL slot comprises at least one of the DL symbol or Flexible symbol of the specific candidate cell.

9. In Paragraph 8, The information regarding the one or more of the above candidate cells includes TDD (time divisional duplexing) UL (uplink)-DL configuration information of the specific candidate cell, and A method in which the above TDD UL-DL setting information includes information regarding the DL / Flexible / UL slot or symbol configuration of the above specific candidate cell.

10. In Paragraph 7, A method in which the above effective DL slot is located within a measurement gap set for LTM.

11. A computer-readable non-transitory recording medium storing a program for performing the method described in claim 1.

12. Regarding the device, At least one processor; and When executed by the at least one processor, the memory includes at least one memory configured to store instructions that cause the at least one processor to perform operations, and The operations of the above-mentioned at least one processor are, Receive information about one or more candidate cells for LTM (L1 / L2-triggered mobility) from a serving cell; and It includes transmitting a CSI report for LTM to the serving cell based on a CSI (channel state information) reference resource for one or more of the candidate cells mentioned above, and The information regarding one or more of the above candidate cells includes information regarding candidate cell SCS (subcarrier spacing), and The above CSI reference resource is a device determined based on information regarding the above candidate cell SCS.

13. In Paragraph 12, The above device is a device that is a terminal including a transceiver or a processing device configured to control the terminal.

14. In a method performed by a base station, Transmitting information about one or more candidate cells for LTM (L1 / L2-triggered mobility) through the terminal's serving cell; and It includes receiving a CSI (channel state information) report for LTM from the terminal through the serving cell, and The above CSI report relates to a CSI reference resource for one or more of the above candidate cells, and The information regarding one or more of the above candidate cells includes information regarding candidate cell SCS (subcarrier spacing), and A method in which the above CSI reference resource is determined based on information regarding the above candidate cell SCS.

15. Regarding base stations, At least one processor; and When executed by the at least one processor, the memory includes at least one memory configured to store instructions that cause the at least one processor to perform operations, and The operations of the above-mentioned at least one processor are, Transmitting information about one or more candidate cells for LTM (L1 / L2-triggered mobility) through the terminal's serving cell; and It includes receiving a CSI (channel state information) report for LTM from the terminal through the serving cell, and The above CSI report relates to a CSI reference resource for one or more of the above candidate cells, and The information regarding one or more of the above candidate cells includes information regarding candidate cell SCS (subcarrier spacing), and The above CSI reference resource is a base station determined based on information regarding the above candidate cell SCS.

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