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

Abstract

A method performed by a terminal, according to at least one of embodiments in the present specification, comprises: receiving a plurality of channel state information-reference signal (CSI-RS) resource configurations by means of higher-layer signaling; performing a CSI-RS measurement on the basis of at least one from among the plurality of CSI-RS resource configurations; and transmitting a measurement report on the basis of the CSI-RS measurement, wherein the plurality of CSI-RS resource configurations include CSI-RS resource configurations for lower-layer triggered mobility (LTM), and second active CSI-RSs related to the CSI-RS resource configurations for the LTM from among the plurality of CSI-RS resource configurations can be separately counted from first active CSI-RSs related to the remaining CSI-RS resource configurations.

Description

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

[0001] The present disclosure relates to a wireless communication system, and more particularly, to a method and device performed between a terminal having mobility and a network operating a plurality of cells in a wireless communication system.

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

[0003] In wireless communication systems, especially 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 task to be achieved in the present disclosure is to provide a method and device for supporting LTM (lower-layer triggered mobility) for rapid mobility. As an example, a method for supporting LTM using CSI-RS resources 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 includes receiving a plurality of channel state information-reference signal (CSI-RS) resource configurations through higher layer signaling; performing CSI-RS measurement based on at least one of the plurality of CSI-RS resource configurations; and transmitting a measurement report based on the CSI-RS measurement, wherein the plurality of CSI-RS resource configurations include CSI-RS resource configurations for lower-layer triggered mobility (LTM), and wherein second active CSI-RSs related to the CSI-RS resource configurations for LTM among the plurality of CSI-RS resource configurations can be counted separately from first active CSI-RSs related to the remaining CSI-RS resource configurations.

[0007] The number of ports of the first active CSI-RSs may be counted separately from the number of ports of the second active CSI-RSs, and the number of resources of the first active CSI-RSs may be counted separately from the number of resources of the second active CSI-RSs.

[0008] The CSI-RS resource settings for the above LTM may be CSI-RS resource settings of candidate cells for LTM-based cell switching.

[0009] The terminal may transmit a terminal capability report to the network. The terminal capability report may include (i) first information regarding the number of first resources and the number of first ports supported by the terminal for the first active CSI-RSs, and (ii) second information regarding the number of second resources and the number of second ports supported by the terminal for the second active CSI-RSs.

[0010] The first active CSI-RSs of the terminal may not exceed the first number of resources or the first number of ports, and the second active CSI-RSs of the terminal may not exceed the second number of resources or the second number of ports.

[0011] The terminal may perform the CSI-RS measurement for at least one of the second active CSI-RSs during a specific time interval.

[0012] During the above specific time period, the terminal can perform the CSI-RS measurement without transmitting or receiving a signal to the serving cell.

[0013] The above specific time interval can be determined based on a time offset for the CSI-RS resource.

[0014] The terminal may perform the CSI-RS measurement for at least one of the second active CSI-RSs based on activation of a transmission configuration indicator (TCI) state for LTM.

[0015] According to another aspect of the present disclosure, a non-transitory computer-readable recording medium having recorded thereon a program for performing the method described above may be provided.

[0016] According to another aspect of the present disclosure, a device 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 a plurality of channel state information-reference signal (CSI-RS) resource configurations via higher-layer signaling; performing CSI-RS measurement based on at least one of the plurality of CSI-RS resource configurations; and transmitting a measurement report based on the CSI-RS measurement, wherein the plurality of CSI-RS resource configurations include CSI-RS resource configurations for lower-layer triggered mobility (LTM), and second active CSI-RSs associated with the CSI-RS resource configurations for LTM among the plurality of CSI-RS resource configurations can be counted separately from first active CSI-RSs associated with the remaining CSI-RS resource configurations.

[0017] The above device may further include a transmitter and receiver.

[0018] The above device may be a terminal.

[0019] The above device may be a processing device configured to control a terminal.

[0020] According to another aspect of the present disclosure, a method performed by a base station includes transmitting a plurality of channel state information-reference signal (CSI-RS) resource configurations to a terminal via upper layer signaling; and receiving a measurement report for CSI-RS measurement of the terminal, wherein the plurality of CSI-RS resource configurations include CSI-RS resource configurations for lower-layer triggered mobility (LTM), and wherein second active CSI-RSs related to the CSI-RS resource configurations for LTM among the plurality of CSI-RS resource configurations can be counted separately from first active CSI-RSs related to the remaining CSI-RS resource configurations.

[0021] According to another aspect of the present disclosure, a base station 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 a plurality of channel state information-reference signal (CSI-RS) resource configurations to a terminal via higher-layer signaling; and receiving a measurement report for CSI-RS measurement of the terminal, wherein the plurality of CSI-RS resource configurations include CSI-RS resource configurations for lower-layer triggered mobility (LTM), and wherein second active CSI-RSs related to the CSI-RS resource configurations for LTM among the plurality of CSI-RS resource configurations can be counted separately from first active CSI-RSs related to the remaining CSI-RS resource configurations.

[0022] In one embodiment, by providing CSI-RS resources for LTM, more accurate and efficient support for terminal mobility can be achieved. For example, since CSI-RS resources for LTM are counted as separate active CSI-RS resources / ports from existing CSI-RS resources for non-LTM, not only can the ambiguity problem regarding active CSI-RS counts be resolved, but also the problem of exceeding terminal capabilities due to CSI-RS resource configurations of multiple candidate cells for LTM can be resolved.

[0023] In addition to the technical effects described above, other technical effects can be inferred from the description below.

[0024] Figure 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 the channels.

[0025] Figure 2 illustrates the structure of a radio frame.

[0026] Figure 3 illustrates a resource grid of slots.

[0027] Figure 4 illustrates an example of physical channels being mapped within a slot.

[0028] Figure 5 shows an example of a CSI-related procedure.

[0029] Figure 6 illustrates an example of an LTM procedure.

[0030] FIG. 7 is a diagram for explaining operations performed by a terminal and a network according to one embodiment.

[0031] Figure 8 illustrates a flow of a method performed by a terminal according to one embodiment.

[0032] FIG. 9 illustrates a flow of a method performed by a base station according to one embodiment.

[0033] Figures 10 to 13 illustrate a communication system (1) and a wireless device applicable to the present disclosure.

[0034] 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 with radio technologies such as UTRA (Universal Terrestrial Radio Access) or CDMA2000. TDMA can be implemented with radio technologies such as GSM (Global System for Mobile communications) / GPRS (General Packet Radio Service) / EDGE (Enhanced Data Rates for GSM Evolution). OFDMA can be implemented with radio technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and E-UTRA (Evolved UTRA). UTRA is a part of UMTS (Universal Mobile Telecommunications System). 3GPP (3rd Generation Partnership Project) LTE (long term evolution) is part of E-UMTS (Evolved UMTS) that uses 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.

[0035] As more and more communication devices demand greater communication capacity, the need for improved mobile broadband communications compared to existing Radio Access Technology (RAT) is emerging. Furthermore, massive Machine Type Communications (MTC), which connects multiple devices and objects to provide diverse services anytime, anywhere, is also a key issue to be considered in next-generation communications. Furthermore, communication system design that considers reliability and latency-sensitive services / terminals is being discussed. Accordingly, the introduction of next-generation RATs, such as enhanced Mobile BroadBand Communication (eMBB), massive MTC, and Ultra-Reliable and Low Latency Communication (URLLC), is being discussed. For convenience, these technologies are referred to as NR (New Radio or New RAT) in this specification.

[0036] For clarity of explanation, the description will focus on 3GPP NR, but the technical idea of ​​the present disclosure is not limited thereto.

[0037] In this specification, the expression "setting" can be replaced with the expression "configure / configuration", and the two can be used interchangeably. In addition, conditional expressions (e.g., "if", "in a case", or "when", etc.) can be replaced with the expression "based on that ~~" or "in a state / status". In addition, the operation of the terminal / base station or the SW / HW configuration according to the satisfaction of the condition can be inferred / understood. In addition, if the process of the receiving (or transmitting) side can be inferred / understood from the process of the transmitting (or receiving) side in signal transmission / reception between wireless communication devices (e.g., base stations, terminals), the description thereof can be omitted. For example, signal determination / generation / encoding / transmission, etc. of the transmitting side can be understood as signal monitoring reception / decoding / determination, etc. of the receiving side. In addition, the expression that the terminal performs (or does not perform) a specific operation can also be interpreted as meaning that the base station operates while expecting / assuming (or expecting / assuming that the terminal does not perform) the specific operation. In addition, the expression that the base station performs (or does not perform) a specific operation can also be interpreted as meaning that the terminal operates while expecting / assuming (or expecting / assuming that the base station does not perform) the specific operation. In addition, the division and index of each section, embodiment, example, option, method, plan, etc. in the following description are for the convenience of explanation and should not be interpreted as meaning that each constitutes an independent invention or that each must be implemented only individually. In addition, in describing each section, embodiment, example, option, method, plan, etc., if there is no explicitly conflicting / opposing description, it can be inferred / interpreted that at least some of them can be combined and implemented together, or at least some can be implemented with the omission of each.

[0038] In a wireless communication system, a terminal receives information from a base station via the downlink (DL) and transmits it to the base station via the uplink (UL). The information transmitted and received between 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 being transmitted and received.

[0039] <Abbreviations / Terms>

[0040] - IAB: Integrated Access and Backhaul

[0041] - CSI-RS: Channel State Information Reference Signal

[0042] - DgNB: Donor gNB

[0043] - AC: Access

[0044] - BH: Backhaul

[0045] - DU: Distributed Unit

[0046] - MT: Mobile terminal

[0047] - CU: Centralized Unit

[0048] - IAB-MT: IAB mobile terminal

[0049] - NGC: Next-Generation Core network

[0050] - SA: Stand-alone

[0051] - NSA: non-stand-alone

[0052] - EPC: Evolved Packet Core

[0053] - IAB-node: RAN node that supports wireless access of UE and transmits access traffic through wireless backhaul.

[0054] - IAB-donor: RAN node that provides terminal interfaces to the core network and wireless backhaul functions to IAB nodes.

[0055] Figure 1 is a drawing for explaining physical channels used in a 3GPP NR system and a general signal transmission method using them.

[0056] When a terminal is powered on again from a powered-off state or enters a new cell, it performs an initial cell search operation, such as synchronizing with the base station, in step S101. To this end, 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 a cell ID (cell identity). In addition, the terminal can obtain broadcast information within the cell based on the PBCH. Meanwhile, the terminal can check the downlink channel status by receiving a Downlink Reference Signal (DL RS) during the initial cell search phase.

[0057] After completing the initial cell search, the terminal can obtain more specific system information by receiving a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) based on the physical downlink control channel information in step S102.

[0058] Thereafter, the terminal may perform a random access procedure such as steps S103 to S106 to complete 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 to 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 such as transmission of an additional physical random access channel (S105) and reception of a physical downlink control channel and a corresponding physical downlink shared channel (S106) may be performed.

[0059] The terminal that has performed the procedure as described above can then perform the general uplink / downlink signal transmission procedure, such as receiving a physical downlink control channel / physical downlink shared channel (S107) and transmitting a physical uplink shared channel (PUSCH) / physical uplink control channel (PUCCH) (S108). The control information that the terminal transmits 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 through PUCCH, but can be transmitted through PUSCH when control information and traffic data must be transmitted simultaneously. Additionally, UCI can be transmitted aperiodically via PUSCH upon request / instruction from the network.

[0060] Figure 2 illustrates the structure of a radio frame. In NR, uplink and downlink transmissions are organized into frames. Each radio frame is 10 ms long and is divided into two 5 ms half-frames (HF). Each half-frame is divided into five 1 ms sub-frames (SF). A sub-frame is divided into one or more slots, and the number of slots within a sub-frame depends on the subcarrier spacing (SCS). Each slot contains 12 or 14 OFDM (Orthogonal Frequency Division Multiplexing) 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.

[0061] Table 1 illustrates that when CP is normally used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary depending on the SCS.

[0062] 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

[0063] * N slot symb : Number of symbols in the slot

[0064] * N frame,u slot : Number of slots in the frame

[0065] * N subframe,u slot : Number of slots in a subframe

[0066] Table 2 illustrates that when extended CP is used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary depending on the SCS.

[0067] SCS (15*2^u)N slot symb N frame,u slot N subframe,u slot 60KHz (u=2)12404

[0068] The structure of the frame is only an example, and the number of subframes, number of slots, and number of symbols in the frame can be varied.

[0069] In an NR system, OFDM numerology (e.g., SCS) may be set differently between multiple cells that are merged into a single terminal. Accordingly, the (absolute time) interval of a time resource (e.g., SF, slot, or TTI) (conveniently referred to as TU (Time Unit)) consisting of the same number of symbols may be set differently between the merged cells. Here, the symbol may include an OFDM symbol (or CP-OFDM symbol), an SC-FDMA symbol (or Discrete Fourier Transform-spread-OFDM, DFT-s-OFDM symbol).

[0070] Figure 3 illustrates a resource grid of a slot. A slot contains multiple symbols in the time domain. For example, in the case of a regular CP, one slot contains 14 symbols, but 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 RBs (PRBs) 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 activated BWPs, and only one BWP can be activated for a single terminal. Each element in the resource grid is referred to as a Resource Element (RE), to which one complex symbol can be mapped.

[0071] Figure 4 illustrates an example of how physical channels are mapped within a slot. A PDCCH can be transmitted in the DL control region, and a PDSCH can be transmitted in the DL data region. A PUCCH can be transmitted in the UL control region, and a PUSCH can be transmitted in the UL data region. GP provides a time gap between the base station and the terminal when switching from transmission mode to reception mode or from reception mode to transmission mode. Some symbols within a subframe at the time of transition from DL to UL can be set as GP.

[0072] Below, each physical channel is described in more detail.

[0073] The PDCCH carries Downlink Control Information (DCI). For example, the PCCCH (i.e., DCI) carries the transmission format and resource allocation of the downlink shared channel (DL-SCH), resource allocation information for the uplink shared channel (UL-SCH), paging information for the paging channel (PCH), system information on the DL-SCH, resource allocation information for upper layer control messages such as random access responses transmitted on the PDSCH, transmission power control commands, activation / deactivation of Configured Scheduling (CS), etc. The DCI includes a cyclic redundancy check (CRC), which is masked / scrambled with various identifiers (e.g., Radio Network Temporary Identifier, RNTI) depending on the owner or usage of the PDCCH. For example, if the PDCCH is for a specific terminal, the CRC is masked with a terminal identifier (e.g., Cell-RNTI, C-RNTI). If the PDCCH is for paging, the CRC is masked with the Paging-RNTI (P-RNTI). If the PDCCH is for system information (e.g., a System Information Block, SIB), the CRC is masked with the System Information RNTI (SI-RNTI). If the PDCCH is for a random access response, the CRC is masked with the Random Access-RNTI (RA-RNTI).

[0074] The 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 with a predetermined code rate depending on the radio channel status. A CCE consists of six Resource Element Groups (REGs). A REG is defined as one OFDM symbol and one (P)RB. The PDCCH is transmitted through a Control Resource Set (CORESET). A CORESET is defined as a set of REGs with a given numerology (e.g., SCS, CP length, etc.). Multiple CORESETs for a single UE can overlap in the time / frequency domain. A CORESET can be configured through system information (e.g., Master Information Block, MIB) or UE-specific upper layer (e.g., Radio Resource Control, RRC, layer) signaling. Specifically, the number of RBs and the number of OFDM symbols (up to 3) that constitute the CORESET can be set by upper layer signaling.

[0075] PDSCH carries downlink data (e.g., DL-SCH transport block, DL-SCH TB) and applies modulation methods such as Quadrature Phase Shift Keying (QPSK), 16 Quadrature Amplitude Modulation (QAM), 64 QAM, and 256 QAM. TB is encoded to generate a codeword. PDSCH can carry up to two codewords. Scrambling and modulation mapping are performed for each codeword, and modulation symbols generated from each codeword can be mapped to one or more layers. Each layer is mapped to resources along with a Demodulation Reference Signal (DMRS), generated as an OFDM symbol signal, and transmitted through the corresponding antenna port.

[0076] PUCCH carries Uplink Control Information (UCI). UCI contains at least one of the following:

[0077] - SR (Scheduling Request): Information used to request UL-SCH resources.

[0078] - HARQ(Hybrid Automatic Repeat reQuest)-ACK(Acknowledgement): This is a response to a downlink data packet (e.g., codeword) on the PDSCH. It indicates whether the downlink data packet was successfully received. One HARQ-ACK bit can be transmitted in response to a single codeword, and two HARQ-ACK bits 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.

[0079] - CSI (Channel State Information): Feedback information for the downlink channel. MIMO (Multiple Input Multiple Output)-related feedback information includes the Rank Indicator (RI) and Precoding Matrix Indicator (PMI).

[0080] 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 the PUSCH is transmitted based on a DFT-s-OFDM waveform, the UE transmits the PUSCH by applying transform precoding. For example, when transform precoding is disabled (e.g., transform precoding is disabled), the UE transmits the PUSCH based on the CP-OFDM waveform, and when transform precoding is enabled (e.g., transform precoding is enabled), the UE can transmit the PUSCH based on the CP-OFDM waveform or the DFT-s-OFDM waveform. PUSCH transmissions can be dynamically scheduled by UL grants in DCI, or semi-statically scheduled (configured grant) based on higher layer (e.g., RRC) signaling (and / or Layer 1 (L1) signaling (e.g., PDCCH)). PUSCH transmissions can be performed in a codebook-based or non-codebook-based manner.

[0081] Figure 5 shows an example of a CSI-related procedure.

[0082] 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-related information, CSI measurement configuration-related information, CSI resource configuration-related information, CSI-RS resource-related information, or CSI report configuration-related information.

[0083] - CSI-IM resources can be configured for interference measurement (IM) of the terminal. In the time domain, the CSI-IM resource set can be configured periodically, semi-persistently, or aperiodicly. The CSI-IM resources can be configured as Zero Power (ZP)-CSI-RS for the terminal. The ZP-CSI-RS can be configured separately from the Non-Zero Power (NZP)-CSI-RS.

[0084] - The UE may assume that the CSI-RS resource(s) for channel measurement configured 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) are in a QCL relationship with respect to 'QCL-TypeD' per resource.

[0085] - 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.

[0086] - CSI-RS can 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 to multiple terminals. CSI-RS can support up to 32 antenna ports. CSI-RS corresponding to N (N is 1 or greater) antenna ports can be mapped to N RE locations within a time-frequency unit corresponding to one slot and one RB. When N is 2 or greater, N-port CSI-RS can be multiplexed using CDM, FDM, and / or TDM schemes. CSI-RS can be mapped to REs other than REs to which CORESET, DMRS, and SSB are mapped. In the frequency domain, CSI-RS can be configured for the entire bandwidth, a portion of the bandwidth (BWP), or a portion of the bandwidth. CSI-RS may be transmitted in each RB within the bandwidth for which CSI-RS is configured (i.e., density = 1), or in 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 on three subcarriers in each resource block (i.e., density = 3). One or more CSI-RS resource sets may be configured for a UE in the time domain. Each CSI-RS resource set may include one or more CSI-RS configurations. Each CSI-RS resource set may be configured periodically, semi-persistently, or aperiodicly.

[0087] - The CSI report configuration may include configurations for feedback type, measurement resources, report type, etc. The NZP-CSI-RS resource set may be used for the CSI report configuration of the corresponding terminal. The NZP-CSI-RS resource set may be associated with CSI-RS or SSB. In addition, multiple periodic NZP-CSI-RS resource sets may be configured as TRS resource sets. (i) The feedback type may include a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a CSI-RS Resource Indicator (CRI), an SSB Resource block Indicator (SSBRI), a Layer Indicator (LI), a Rank Indicator (RI), a Layer 1-Reference Signal Received Strength (RSRP), etc. (ii) Measurement resources may include configurations for downlink signals and / or downlink resources on which the terminal performs measurements to determine feedback information. The measurement resources may be configured as ZP and / or NZP CSI-RS resource sets associated with CSI reporting configurations. The NZP CSI-RS resource set may include a CSI-RS set or an SSB set. For example, L1-RSRP may be measured for a CSI-RS set or an SSB set. (iii) Reporting types may include configurations for a time point at which the terminal performs reporting and an uplink channel, etc. The reporting time point may be configured as periodic, semi-persistent, or aperiodic. Periodic CSI reporting may be transmitted on PUCCH. Semi-persistent CSI reporting may be transmitted on PUCCH or PUSCH based on a MAC CE indicating activation / deactivation. Aperiodic CSI reporting may be indicated by DCI signaling.For example, the CSI request field of an uplink grant may indicate one of several report trigger sizes. Aperiodic CSI reports may be transmitted on the PUSCH.

[0088] The terminal measures CSI based on configuration information related to CSI. CSI measurement may include a procedure of receiving a CSI-RS (720) and computing the received CSI-RS to acquire CSI (730).

[0089] The UE can transmit a CSI report to the base station (740). For the CSI report, the time and frequency resources that the UE can use are controlled by the base station. The CSI (channel state information) can 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), L1-RSRP, and / or L-SINR.

[0090] The time domain behavior of CSI reporting supports periodic, semi-persistent, and aperiodic. i) Periodic CSI reporting is performed on short PUCCH and long PUCCH. The periodicity and slot offset of periodic CSI reporting can be configured by RRC, and refer to the CSI-ReportConfig IE. ii) SP (semi-periodic) CSI reporting is performed on short PUCCH, long PUCCH, or PUSCH. In case of SP CSI on short / long PUCCH, the periodicity and slot offset are configured by RRC, and CSI reporting is activated / deactivated by separate MAC CE / DCI. In case of SP CSI on PUSCH, the periodicity of SP CSI reporting is configured by RRC, but the slot offset is not configured by RRC, and SP CSI reporting is activated / deactivated by DCI (format 0_1). For SP CSI reporting on PUSCH, a separate RNTI (SP-CSI C-RNTI) is used. The initial CSI reporting timing follows the PUSCH time domain allocation value indicated in the DCI, and subsequent CSI reporting timings follow the cycle set by RRC. DCI format 0_1 ​​includes a CSI request field and can activate / deactivate a specific configured SP-CSI trigger state. SP CSI reporting has the same or similar activation / deactivation mechanism as the data transmission mechanism on the SPS PUSCH.iii) Aperiodic CSI reporting is performed on PUSCH and is triggered by DCI. In this case, information related to the triggering of aperiodic CSI reporting can be transmitted / indicated / configured via MAC-CE. For AP CSI with AP CSI-RS, the AP CSI-RS timing is configured by RRC, and the timing for AP CSI reporting is dynamically controlled by DCI.

[0091] L1-RSRP / L1-SINR Measurement and Reporting

[0092] The terminal can be configured to measure based on CSI-RS resources, SS / PBCH block resources, or both to calculate L1-RSRP. Each resource can have a quasi-colocation relationship with type-C and type-D resources as needed.

[0093] A terminal can configure up to 16 CSI-RS resource sets, each of which can contain up to 64 CSI-RS resources. The total number of resources is limited to 128.

[0094] When reporting an L1-RSRP value, the above terminal may report in one of the following ways depending on the setting of the upper layer parameters nrofReportedRS, nrOfReportedCells, or nrOfReportedRS-PerCell:

[0095] - Single value reporting: Reported as a 7-bit value, quantized in 1 dB increments in the range [-140, -44] dBm.

[0096] - Differential value reporting: Quantize the maximum value to 7 bits, and differentially quantize the remaining resources to 4 bits (in 2 dB increments) based on the maximum value.

[0097] Additionally, when group-based beam reporting is set, the CSI Resource Set and associated CRI / SSBRI of the resource that measured the largest L1-RSRP may be reported first.

[0098] 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, depending on whether the upper layer parameter timeRestrictionForChannelMeasurements is set.

[0099] Additionally, if SSB-MTC-AdditionalPCI is set in CSI-ReportConfig, the CSI-SSB-ResourceSet for L1-RSRP reporting may contain a pair of SSB indices and PCI indices.

[0100] When 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 SRS antenna ports supported by the terminal along with the SSBRI / CRI and L1-RSRP values.

[0101] The terminal may be configured to perform channel and interference measurements based on the following resources to calculate L1-SINR:

[0102] - Channel Measurement: NZP CSI-RS and / or SS / PBCH Block

[0103] - Interference measurement: NZP CSI-RS or CSI-IM

[0104] A resource configuration can include up to 16 CSI-RS resource sets, and each set can include up to 64 CSI-RS or SS / PBCH Block resources.

[0105] The L1-SINR reporting method is as follows:

[0106] - Single value reporting: 7-bit values ​​in the range [-23, 40] dB, quantized in 0.5 dB steps.

[0107] - Differential value reporting: The maximum value is quantized to 7 bits, and the remaining resources are differentially quantized to 4 bits (in 1 dB increments) based on the maximum value.

[0108] When NZP CSI-RS is used for channel / interference measurements, corrections such as powerControlOffset defined in higher layers are not applied.

[0109] Additionally, depending on whether timeRestrictionForChannelMeasurements and timeRestrictionForInterferenceMeasurements are set, the terminal can be configured to produce measurements based on the latest measurement resources.

[0110] When 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 together with the SSBRI / CRI and L1-SINR values.

[0111] The terminal may be configured to perform CSI-RS-based radio resource measurement (RRM) according to the CSI-RS-ResourceConfigMobility information element. The configuration may include:

[0112] - List of cells to be measured (csi-RS-CellList-Mobility)

[0113] - Identifier of each cell (cellId), measurement bandwidth (nrofPRBs, startPRB), resource density (density), CSI-RS resource list

[0114] - Configure CSI-RS index, period and slot offset (slotConfig), frequency and time domain allocation, sequence ID, etc. for each CSI-RS resource.

[0115] 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 not included, the timing reference may be set based on the serving cell or refServCellIndex.

[0116] slotConfig contains a periodicity in ms and an offset in slots based on the subcarrier spacing, which defines the transmission timing of the CSI-RS resource.

[0117] LTM- Lower-layer (eg, L1 / L2) Triggered Mobility

[0118] LTM is a procedure that allows a base station to change the serving cell of a terminal (UE) based on a cell switch command signaled via MAC CE by receiving an L1 layer (PHY) measurement report from the terminal (UE). The cell switch command indicates an LTM candidate configuration that the base station prepared in advance and provided to the terminal via an RRC signal, and the terminal performs a switch to the target configuration according to the command. The LTM procedure can be used to reduce mobility delay.

[0119] If configured by the network, the TCI state for one or more cells other than the current serving cell can be pre-activated. For example, the TCI states of LTM candidate cells can be pre-activated before these cells become the serving cell. This allows the UE to maintain downlink synchronization with these cells, enabling faster transitions when a cell switch is triggered. When the LTM cell switch is executed, all activated TCI states except the TCI state received in the cell switch command are deactivated.

[0120] Additionally, if configured by the network, the UL Timing Advance (TA) acquisition procedure (early TA) can be initiated for one or more cells other than the current serving cell, provided that the cells have the same N as the current serving cells. TA have a value, or N TA If is 0, no pre-TA acquisition is required. The network can request the UE to perform early TA acquisition for a specific candidate cell before the cell switch. This early TA acquisition procedure can be triggered by a PDCCH command or by UE-based TA measurement configured by 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 through the BS-CU. The serving cell includes the TA value in the MAC CE of the LTM cell switch command and transmits it to the UE. In the latter case, the UE performs TA measurement on its own for the candidate cells after it is configured by RRC, and the timing of the measurement depends on the UE implementation. If a valid TA value is not included when the cell switch command is received, the UE can perform LTM without a random access procedure (RACH-less) by applying the TA value measured by itself. In addition, the network can include the TA value in the cell switch command MAC CE without the early TA acquisition procedure.

[0121] Depending on the presence of a valid TA value, the UE performs a RACH-less LTM cell switch or a RACH-based LTM cell switch. If the cell switch command includes a valid TA value, the UE applies the value according to the network instruction. If the UE-based TA measurement is configured but the cell switch command does not include a valid TA value, the UE may apply a valid TA value measured by itself. If a valid TA value exists, the UE performs a RACH-less LTM cell switch, and otherwise, it performs a RACH-based LTM cell switch.

[0122] Regardless of whether a UE has configured terminal-based TA measurements for a specific candidate cell, the UE can still perform random access procedures for candidate cells based on PDCCH commands. This also applies to candidate cells for which the UE can derive its own TA values. Furthermore, even if the UE has already performed random access to candidate cells, it must still follow the terminal-based measurement configuration configured by the network.

[0123] In RACH-less LTM, the UE accesses the target cell using a configured grant (CG) or dynamic grant (DG). The CG is included in the LTM candidate configuration, and the UE selects a grant opportunity associated with the beam indicated by the cell switch command. When the LTM cell switch to the target cell is initiated, the UE begins monitoring the PDCCH for dynamic scheduling in the target cell. Until the RACH-less LTM procedure is completed, the UE must not trigger a random access if there are no valid PUCCH resources for the triggered SR.

[0124] 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 movement to frequencies other than the current serving cell. LTM is supported only in licensed spectrum. The following scenarios are supported:

[0125] - PCell changes in non-CA and non-DC scenarios

[0126] - PCell and SCell changes in CA scenario

[0127] - Dual connectivity scenario: PCell and MCG SCell changes, PSCell and SCG SCell changes within the SN (without MN involvement). However, simultaneous changes of PCell and PSCell are not supported in LTM.

[0128] While the UE is storing the LTM candidate configuration, all L3 handovers except DAPS handovers can be performed. In the L3 handover-related RRC messages applied by the UE, the target cell can add, modify, or release the LTM candidate configuration.

[0129] The cell switch command is conveyed via a MAC Control Element (MAC CE), which contains the information required to perform an LTM cell switch.

[0130] Subsequently, LTM is performed by repeating the initial synchronization, LTM cell switch execution, and LTM cell switch completion steps without releasing other stored LTM candidate configurations after each LTM cell switch completion. The general procedure on the wireless interface is also applicable to SCG LTM.

[0131] Figure 6 illustrates an example of an LTM procedure.

[0132] Referring to FIG. 6, a terminal (UE) transmits a Measurement Report message to a base station (gNB). The base station determines an LTM setting and initiates an LTM preparation procedure (501).

[0133] The base station transmits an RRCReconfiguration message including an LTM candidate configuration to the terminal (502).

[0134] The terminal stores the LTM candidate configuration and transmits an RRCReconfigurationComplete message to the base station (503).

[0135] The terminal performs downlink synchronization (DL synchronization) with LTM candidate cells before receiving a cell switch command. The terminal can activate or deactivate the TCI state of the LTM candidate cells according to a trigger from the base station (504a).

[0136] The UE can perform uplink synchronization (UL synchronization) with LTM candidate cells before receiving a cell switch command, either through UE-based TA measurement or preamble transmission according to a base station trigger, if configured. If UE-based TA measurement is configured, the UE acquires TA values ​​for candidate cells through measurement (504b). If requested by the network, the UE 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 UE transmits a preamble to the indicated candidate cell. To minimize data interruption of the source cell due to CFRA for candidate cells, the UE does not receive a random access response from the network for the purpose of TA value acquisition, and the TA value of the candidate cell is specified in the cell switch command. The UE does not maintain a TA timer for the candidate cell, and TA validity guarantee depends on the network implementation.

[0137] The terminal performs L1 measurements on the configured LTM candidate cells and transmits the corresponding L1 measurement report to the base station (505). The L1 measurements must be performed while the RRC reconfiguration (step 502) is valid.

[0138] The base station determines a cell switch to the target cell and transmits an LTM cell switch command MAC CE (506) that triggers the cell switch. This command includes a target configuration ID indicating a 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 available, 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.

[0139] 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).

[0140] The UE completes the LTM cell switch procedure by sending an RRCReconfigurationComplete message to the target cell (508). If the UE performed a random access procedure in step 507, the LTM cell switch is considered to have been successfully completed when the random access procedure is successfully completed. In the case of RACH-less LTM, the UE considers the LTM cell switch to have been completed when it determines that the first UL data has been successfully received by the network.

[0141] Steps 504 to 508 can be performed iteratively by utilizing the LTM candidate configuration provided in step 502.

[0142] The procedure on the wireless interface illustrated in Fig. 6 can be applied to both intra-BS-DU LTM and inter-BS-DU LTM.

[0143] For LTM and L1 measurement reporting, 1) LTM-CSI-ResourceConfig information element and 2) LTM-CSI-ReportConfig information element may be provided to the terminal through upper layer signaling.

[0144] 1) The LTM-CSI-ResourceConfig information element may be configured to define one or more CSI resource groups related to 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 including multiple SS / PBCH block resources and associated LTM candidate identifiers, and includes the following items:

[0145] ltm-CSI-SSB-ResourceList-r18: An index list identifying one or more SS / PBCH block resources, which may be configured across different LTM candidate cells.

[0146] ltm-CandidateIdList-r18: A list of LTM candidate cell IDs corresponding to each SSB resource. The first candidate cell ID is associated with the first SSB index, the second candidate cell ID is associated with the second SSB index, and so on.

[0147] 2) LTM-CSI-ReportConfig is an information element for configuring an LTM-related CSI-based measurement report performed for a specific cell, and the reporting target cell is defined as a cell that includes the LTM-CSI-ReportConfig.

[0148] LTM-CSI-ReportConfig may contain: (i) ltm-CSI-ReportConfigId-r18, (ii) ltm-ResourcesForChannelMeasurement-r18 (representing reference CSI resource configuration for measurements, identified by LTM-CSI-ResourceConfigId), (iii) ltm-ReportConfigType-r18 (periodic / semiPersistentOnPUCCH / semiPersistentOnPUSCH / aperiodic), (iv) ltm-ReportContent-r18

[0149] ltm-ReportContent-r18 defines what will be included in a single L1 measurement report instance and can include the following parameters:

[0150] - nrOfReportedCells-r18: Number of cells reported (e.g. 1 to 4)

[0151] - nrOfReportedRS-PerCell-r18: Number of RS reported per cell (e.g. 1 to 4)

[0152] - spCellInclusion-r18: Defines whether to include the current serving cell (SpCell) in the report. Configurable only when SpCell is set as an LTM candidate.

[0153] CSI-RS based LTM

[0154] The LTM procedure discussed above is based on the SSB (SS / PBCH block). For example, the serving cell / base station provides the UE with information about the SSB of a candidate (e.g., neighboring) cell / base station, and the LTM cell switch decision and command are performed based on the UE's measurement and reporting of the candidate cell / base station's SSB.

[0155] Meanwhile, SSB is typically transmitted with fewer resources / frequency than CSI-RS in the frequency / time domain, and beams applied to SSB may have coarse characteristics compared to those applied to CSI-RS. To ensure more accurate and efficient measurement reporting and cell switch decisions for LTM, CSI-RS needs to support LTM.

[0156] Below, we describe the LTM procedure based on CSI-RS and the related terminal / base station operations.

[0157] Intra-frequency measurement, as discussed in 3GPP, can refer to measurements where the resource has the same center frequency as the data reception, is confined within the active BWP, and has the same reference SCS as the active BWP. Inter-frequency measurement can refer to all measurements that do not fall under intra-frequency measurement. In the Rel-18 RAN1 discussion, there was an attempt to support the two separately, but it was concluded that this belongs to the domain of RAN4, not RAN 1. Therefore, this specification also assumes and describes cases where intra- / inter-frequency measurement is not supported separately.

[0158] In order to support the intra- / inter-frequency CSI-RS based LTM measurement operation of the terminal, a method for the base station to configure / instruct the CSI-RS resources used for measurement must be supported.

[0159] Since the UE measures the measurement resources for beam reports and transmits the reports to the BS via UCI, the UE expects that the resources will not collide with other DL signals / channels. Since SS / PBCH blocks (SSBs) always have a high priority, it is natural for the BS to adjust them to avoid collisions with SSBs and other DL signals / channels. However, since CSI-RS has a large number of resources and has a lower priority than SSBs, it is difficult for the BS to prevent collisions with other signals for all CSI-RS resources. Furthermore, since the bandwidth of CSI-RS (e.g., up to 276 RBs) is much larger than that of SSB (e.g., 20 RBs), most of them are likely not covered by the UE's active DL BWP. Therefore, the ambiguity regarding whether the UE can measure the configured resources for CSI-RS-based LTM measurement needs to be resolved.

[0160] In addition, in the current 3GPP NR Rel-18 standard, a terminal cannot have more active CSI-RS port(s) or active CSI-RS resource(s) within an active BWP than the 'capability reported to the base station'. Specifically, Section 5.2.1.6 of the Rel-18 standard 38.214 specifies the number of active CSI-RSs as shown in Table 3 below.

[0161] In no slot is a UE expected to have more active CSI-RS ports or active CSI-RS resources in the active BWP than the value reported by the UE Capability. The active duration of an NZP CSI-RS resource is defined as follows, depending on the resource type: - Aperiodic CSI-RS: From the end of the PDCCH containing the request to the end of the scheduled PUSCH containing the report related to this aperiodic CSI-RS. If there are two PDCCH candidates belonging to the search space set linked by searchSpaceLinkingId, the PDCCH candidate that ends later among the two candidates is used for determining the NZP CSI-RS active duration. - Semi-persistent CSI-RS: From the end of the activation command to the end of the deactivation command. - Periodic CSI-RS: From the time when the periodic CSI-RS is configured by upper layer signaling to the end of the periodic CSI-RS configuration. Until the point of release.

[0162] As shown in Table 3, aperiodic / SPS / periodic CSI-RS belonging to the active duration are counted as active CSI-RS, and the terminal may be configured not to have the number of active CSI-RS ports or resources per slot exceeding the number of active CSI-RS ports / resources reported by the terminal.

[0163] Meanwhile, the name of the parameter indicating the number of active CSI-RS resources / ports in the terminal's capability report may also be expressed as the number of simultaneous CSI-RS resources / ports.

[0164] If Rel-19 or the next-generation wireless communication standard supports inter-frequency CSI-RS for LTM purposes, the corresponding CSI-RS resource can be configured outside the active BWP, and the ambiguity of the terminal as to whether the corresponding resource should be counted should be resolved.

[0165] Considering these technical backgrounds and challenges, this specification proposes a method to support terminals to ensure measurement of intra- / inter-frequency CSI-RS resources for LTM purposes. Furthermore, when intra- / inter-frequency CSI-RS resources for LTM purposes are configured, a method for counting the number of active CSI-RS ports / CSI-RS resources within an active BWP is proposed.

[0166] As an example, we propose a configuration / instruction method for ensuring measurement operation of a corresponding resource for intra- / inter-frequency CSI-RS based LTM measurement of a terminal, and a method for a terminal to determine whether the corresponding resource is active CSI-RS resource counting. In the following description, intra- / inter-frequency CSI-RS for LTM may be briefly referred to as intra- / inter-frequency CSI-RS, and intra- / inter-frequency measurement for LTM may also be briefly referred to as intra- / inter-frequency measurement.

[0167] [Method 1] A method for setting / instructing a terminal to measure the CSI-RS measurement resources of a candidate cell set for LTM purposes.

[0168] [Method 1-1] A method for setting / instructing a terminal to measure CSI-RS resources set by LTM CSI configuration 'only when they exist within a specific measurement time interval'.

[0169] For example, a terminal can be configured / instructed to measure only when the CSI-RS resources configured by the LTM CSI configuration exist within a specific measurement time interval. Specifically, two methods can be proposed: 1) explicitly configuring / instructing the measurement interval, and 2) implicitly configuring / instructing the measurement interval, including the forward and backward offsets of the measurement resources. Each of these is described as option 1 and option 2.

[0170] Option 1) A method to guarantee the UE's measurement operation by explicitly setting the time interval for inter-frequency measurement.

[0171] When CSI-RS-based inter-frequency LTM is supported and inter-frequency CSI-RS resources of a candidate cell are set for LTM purposes, a method of setting / instructing a time interval (hereinafter, a first measurement interval) that guarantees measurement of the corresponding resource in order to set / instruct the corresponding CSI-RS resource so that the terminal can measure it may be proposed.

[0172] Within the first measurement interval proposed above, the terminal may not expect transmission or reception of other signals / channels of the serving cell except for the CSI-RS for LTM resources of the adjacent cell set by the LTM CSI configuration. Hereinafter, the term "adjacent cell" may be replaced with the term "LTM candidate cell." If some or all of the other signals / channels of the serving cell overlap with the first measurement interval, the terminal may not transmit or receive the corresponding signals / channels of the serving cell existing within the first measurement interval.

[0173] For example, the first measurement interval can be directly configured from the base station to the terminal via NR RRC signaling. The RRC configuration information can include at least one of an offset, a periodicity, and / or a duration of the first measurement interval. As a specific example, a L1-MeasGapConfig IE can be newly defined within an LTM CSI RRC configuration IE that configures a CSI-RS resource outside active BWP for LTM purposes, and fields for configuring an offset, a periodicity, and / or a duration can be defined within the IE.

[0174] Option 2) A method to guarantee the UE's measurement operation by implicitly setting the time interval for inter-frequency measurement.

[0175] In order to ensure the inter-frequency CSI-RS based LTM operation of the proposed terminal, a method may be proposed in which the inter-frequency CSI-RS resource set for LTM purpose includes a first offset before / after the set time period, so that the corresponding time period operates as a first measurement period. For example, when the terminal wants to measure an inter-frequency CSI-RS resource, an additional time period / gap may be required before / after the point in time of the inter-frequency CSI-RS resource. For example, in the case of inter-frequency, an additional time period / gap may be further required due to a preparation period such as frequency re-tuning. This requirement can be satisfied by setting the first offset period before and / or after the inter-frequency CSI-RS resource to be measured.

[0176] For example, within the first measurement interval, the terminal may not expect transmission or reception of other signals / channels of the serving cell, except for the CSI-RS for LTM resources of the adjacent cell set by the LTM CSI configuration. If some or all of the other signals / channels of the serving cell overlap with the first measurement interval, the terminal may not transmit or receive the corresponding signals / channels of the serving cell.

[0177] For example, the first offset can be configured by the base station. The first offset can be preset / instructed by the base station based on the capability report reported by the terminal to the base station. And / or, if the terminal does not receive configuration / instruction related to the first offset from the base station, the proposed first offset can be considered based on the capability report reported by the terminal to the base station. For example, if there is no signaling of an explicit first offset value, the terminal can be configured to apply / use a (default) offset based on the capability reported by the terminal.

[0178] The implicit configuration method may have the advantage of reducing configuration / instruction signal overhead and latency because the base station does not need a separate configuration / instruction of the measurement section to ensure the terminal's inter-frequency CSI resource measurement operation.

[0179] When option 1 and / or option 2 of the above proposed [Method 1-1] are applied, the operation of the terminal may be based on at least some of the cases below.

[0180] Case 1. If the CSI-RS configured for LTM includes both intra- and inter-frequency measurements in the number of existing active CSI-RS port(s) / resource(s):

[0181] In case option 1 and / or option 2 of the above proposed [Method 1-1] are applied, if an intra-frequency measurement CSI-RS resource for LTM purpose is configured, the terminal may count the resource based on the active duration determined according to the resource type (e.g., periodic / aperiodic / SPS) of the resource, regardless of whether the resource exists within the first measurement interval proposed above. Hereinafter, the number of existing active CSI-RS port(s) / resource(s) may mean the number of active CSI-RS port(s) / resource(s) defined and counted in Rel.18 or earlier standards in which CSI-RS-based LTM is not introduced (e.g., Table 3). For example, even if the intra-frequency measurement CSI-RS resource is not included in the first measurement interval, the terminal can count the intra-frequency measurement CSI-RS resource as the number of active CSI-RS port(s) / resource(s) in the existing (e.g., Table 3) if the active condition is satisfied based on the active duration.

[0182] When an inter-frequency measurement CSI-RS resource for LTM purposes is set within the first measurement interval proposed above, the UE can count it by including it in the number of existing active CSI-RS port(s) / resource(s) according to the rule of active CSI-RS port(s) / resource(s) determined according to the resource type of the corresponding resource. As a specific example, in the case of an aperiodic intra- / inter-frequency measurement CSI-RS resource for LTM purposes, the UE counts the active duration of the corresponding resource from the end of the PDCCH containing the request to the end of the scheduled PUSCH containing the report for the corresponding CSI-RS resource. As another example, in the case of a semi-persistent intra- / inter-frequency measurement CSI-RS resource for LTM purposes, the UE counts the active duration of the corresponding resource from the end of the time when the activation command is applied to the end of the time when the deactivation command is applied. As another example, in the case of periodic intra- / inter-frequency measurement CSI-RS resources for LTM purposes, the terminal counts the active duration of the resource from the time the resource is configured by higher layer signaling to the time the configuration is released.If the inter-frequency measurement CSI-RS resource is not included in the first measurement interval, the terminal may not count the inter-frequency measurement CSI-RS resource in the number of existing active CSI-RS port(s) / resource(s) (regardless of the active duration or without determining whether the active duration exists).

[0183] Case 2. If the CSI-RS set for LTM is counted as an intra-frequency measurement, it is included in the number of existing active CSI-RS ports(s) / resource(s).

[0184] - Case 2-1. In case of inter-frequency measurement, separate capability signaling is introduced and counted separately.

[0185] In case option 1 and / or option 2 of the above proposed [Method 1-1] are applied, if an intra-frequency measurement CSI-RS resource for LTM purpose is configured, the terminal may count the resource by including it in the number of existing active CSI-RS port(s) / resource(s) based on the active duration determined according to the resource type (e.g., periodic / aperiodic / SPS) of the resource, regardless of whether the resource exists within the first measurement interval proposed above (e.g., even if it does not exist within the first measurement interval).

[0186] When an inter-frequency measurement CSI-RS resource for LTM purposes is configured, the terminal can count the resource based on the active duration determined according to the resource type (e.g., periodic / aperiodic / SPS) of the resource only if the resource exists within the first measurement interval proposed above. For example, the terminal may be configured with multiple active CSI-RS resource / port count values ​​(counters), and the first active CSI-RS resource / port counter is for counting the intra-frequency measurement CSI-RS resource / port for the existing CSI-RS and LTM as shown in Table 3, and the newly added second active CSI-RS resource / port counter is for counting the inter-frequency measurement CSI-RS resource / port for LTM included in the first measurement interval. Meanwhile, a resource counter and a port counter may be included for each counter.

[0187] In this way, when counting the active number of CSI-RS resource(s) / port(s) for LTM separately from the existing active number of CSI-RS resource(s) / port(s) of active BWP, the UE may report the maximum active number of CSI-RS resource(s) / port(s) (supported by the UE) for LTM to the base station in advance through separate capability signaling, and apply the counting method described below based on that value.

[0188] And / or, in case of counting the active number of CSI-RS resource(s) / port(s) for LTM separately from the existing active number of CSI-RS resource(s) / port(s) of active BWP, the UE may derive the maximum active number of CSI-RS resource(s) / port(s) for LTM in advance based on the active number of CSI-RS resource(s) / port(s) reported as a capability to the existing base station. In this case, the base station may derive the value based on the previously reported capability value even without performing separate capability signaling to the base station. The above-described counting method may be applied based on that value.

[0189] And / or the terminal may be expected to report to the serving cell if the counted active resources exceed a separate active CSI-RS resource capability and / or not measure / report the active resources.

[0190] - Case 2-2. In case of inter-frequency measurement, only if the resource is guaranteed measurement by a specific measurement interval in [Method 1-1], it is counted separately / existingly.

[0191] In case option 1 and / or option 2 of the above proposed [Method 1-1] are applied, if an intra-frequency measurement CSI-RS resource for LTM purpose is configured, the terminal may count the resource by including it in the number of existing active CSI-RS port(s) / resource(s) based on the active duration determined according to the resource type (e.g., periodic / aperiodic / SPS) of the resource, regardless of whether the resource exists within the first measurement interval proposed above (e.g., even if it does not exist within the first measurement interval).

[0192] When an inter-frequency measurement CSI-RS resource for LTM purposes is set, the terminal may count the resource based on the active duration determined according to the resource type (e.g., periodic / aperiodic / SPS) of the resource only if the resource exists within the first measurement interval proposed above, and include the resource in the number of existing / separate active CSI-RS port(s) / resource(s).

[0193] Case 3. When the number of active resources for CSI-RS set for LTM is counted separately from the number of existing active CSI-RS port(s) / resource(s)

[0194] For example, a method is proposed to count CSI-RS for LTM separately from the number of existing active CSI-RS port(s) / resource(s) (e.g., Table 3). When performing LTM measurement, the UE has not yet performed cell switching to a candidate cell but is still operating in the existing serving cell, and it is necessary to perform reception / measurement operations for the existing CSI-RS for non-LTM purposes (referred to as non-LTM CSI-RS for convenience) configured in the serving cell. However, when the CSI-RSs of multiple candidate cells for LTM are configured and counted together with the non-LTM CSI-RS (e.g., counted with the same counter value), the maximum number of resources / ports reported by the UE in its Capability may frequently be exceeded. In such a situation where the UE exceeds its Capability, a problem may arise in which correct measurement / reporting of non-LTM CSI-RS cannot be guaranteed. As an example to address this issue, a method has been proposed to count the number of active ports / resources for (at least some) LTM CSI-RSs separately from non-LTM CSI-RSs. To achieve this separate counting, the number of active (simultaneous) CSI-RS resources / ports supported by the terminal for LTM could be additionally reported as a capability.

[0195] - Case 3-1. Count intra- / inter-frequency measurements together

[0196] In case option 1 and / or option 2 of the above proposed [Method 1-1] are applied, if intra- / inter-frequency measurement CSI-RS resources for LTM purposes are set, the terminal may count the intra- / inter-frequency measurement CSI-RS resources by including them in the number of active CSI-RS port(s) / resource(s) separately from the number of existing active CSI-RS port(s) / resource(s) according to the resource type (e.g., periodic / aperiodic / SPS) of the corresponding resources.

[0197] For example, the terminal may count intra- / inter-frequency measurement CSI-RS resources in the number of separate active CSI-RS port(s) / resource(s) according to the resource type (e.g., periodic / aperiodic / SPS) of the resource, regardless of whether the resource exists within the proposed first measurement interval (e.g., even if it does not exist within the first measurement interval).

[0198] In this way, intra- / inter-frequency measurement CSI-RS resources of a candidate cell / base station for LTM can be counted together without distinction between intra- / inter-frequency, and a separate active CSI-RS port(s) / resource(s) counter for LTM (e.g., the second counter) can be additionally set to the existing active CSI-RS port(s) / resource(s) counter (e.g., the first counter as in Table 3). Meanwhile, each counter can include a resource counter and a port counter.

[0199] If the active number of CSI-RS resource(s) / port(s) for LTM is counted separately from the existing active number of CSI-RS resource(s) / port(s) of active BWP, the UE may report the maximum active number of CSI-RS resource(s) / port(s) for LTM to the base station in advance through separate capability signaling, and apply the counting method described below based on that value.

[0200] And / or, in case of counting the active number of CSI-RS resource(s) / port(s) for LTM separately from the existing active number of CSI-RS resource(s) / port(s) of active BWP, the UE derives the maximum active number of CSI-RS resource(s) / port(s) for LTM in advance based on the active number of CSI-RS resource(s) / port(s) reported as a capability to the existing base station, and even if separate capability signaling is not performed to the base station, the base station can derive it based on the previously reported capability value. The above-described counting method can be applied based on that value.

[0201] And / or the terminal may be expected to report to the serving cell if the counted active resources exceed a separate active CSI-RS resource capability and / or not measure / report the active resources.

[0202] - Case 3-2. Count intra- and inter-frequency measurements separately.

[0203] In case option 1 and / or option 2 of the above proposed [Method 1-1] are applied, if an intra-frequency measurement CSI-RS resource for LTM purpose is configured, the terminal may count the resource by including it in the number of active CSI-RS port(s) / resource(s) separately (e.g., separate from the existing first counter described in Table 3) based on the active duration determined according to the resource type (e.g., periodic / aperiodic / SPS), regardless of whether the resource exists within the first measurement interval proposed above (e.g., even if it does not exist within the first measurement interval) (e.g., second counter). At this time, when counting the active number of CSI-RS resource(s) / port(s) for LTM separately from the existing active number of CSI-RS resource(s) / port(s) of active BWP, the UE may report the maximum active number of CSI-RS resource(s) / port(s) for LTM to the base station in advance through separate capability signaling, and apply the counting method described below based on that value.And / or when counting the active number of CSI-RS resource(s) / port(s) for LTM separately from the existing active number of CSI-RS resource(s) / port(s) of active BWP, the UE derives the maximum active number of CSI-RS resource(s) / port(s) for LTM based on the active number of CSI-RS resource(s) / port(s) previously reported as a capability to the existing base station, and the base station can derive it based on the previously reported capability value even without performing separate capability signaling to the base station. The counting method described above can be applied based on that value. And / or, the UE can be expected to report to the serving cell and / or not measure / report the corresponding active resource if the counted active resource exceeds a separate active CSI-RS resource capability.

[0204] In case option 1 and / or option 2 of the above proposed [Method 1-1] are applied, if an inter-frequency measurement CSI-RS resource for LTM purpose is configured, the terminal may count the resource by including it in the number of separate active CSI-RS port(s) / resource(s) based on the active duration determined according to the resource type (e.g., periodic / aperiodic / SPS) of the resource, regardless of whether the resource exists within the proposed first measurement interval (e.g., even if the resource does not exist within the first measurement interval) or only if the resource exists within the first measurement interval (e.g., third counter). At this time, when counting the active number of CSI-RS resource(s) / port(s) for LTM separately from the existing active number of CSI-RS resource(s) / port(s) of active BWP, the UE may report the maximum active number of CSI-RS resource(s) / port(s) for LTM to the base station in advance through separate capability signaling, and apply the counting method described below based on that value.And / or when counting the active number of CSI-RS resource(s) / port(s) for LTM separately from the existing active number of CSI-RS resource(s) / port(s) of active BWP, the UE derives the maximum active number of CSI-RS resource(s) / port(s) for LTM based on the active number of CSI-RS resource(s) / port(s) previously reported as a capability to the existing base station, and the base station can derive it based on the previously reported capability value even without performing separate capability signaling to the base station. The counting method described above can be applied based on that value. And / or, the UE can be expected to report to the serving cell and / or not measure / report the corresponding active resource if the counted active resource exceeds a separate active CSI-RS resource capability.

[0205] [Method 1-2] How to configure / instruct the terminal to measure the CSI-RS resources set by the LTM CSI configuration 'regardless of inter- or intra-frequency measurement'

[0206] For example, we propose a method for configuring / instructing a terminal to measure CSI-RS resources set by LTM CSI configuration 'regardless of inter- or intra-frequency measurement' and the corresponding operation of the terminal.

[0207] For example, if the terminal is set to measure based on CSI-RS by LTM CSI configuration, it can be determined that measurement can always be performed regardless of whether it is intra-frequency measurement or inter-frequency measurement.

[0208] When the above proposed [Method 1-2] is applied, the operation of the terminal may be based on at least some of the cases below.

[0209] Case 1. If the CSI-RS configured for LTM includes both intra- and inter-frequency measurements in the number of existing active CSI-RS port(s) / resource(s)

[0210] When the above proposed [Method 1-2] is applied, the UE can count the active duration of the intra- / inter-frequency measurement CSI-RS resource for LTM purposes based on the resource type (e.g., periodic / aperiodic / SPS) of the resource by including the resource in the number of existing active CSI-RS port(s) / resource(s). As a specific example, in the case of an aperiodic intra- / inter-frequency measurement CSI-RS resource for LTM purposes, the UE counts the active duration of the resource from the end of the PDCCH containing the request to the end of the scheduled PUSCH containing the report for the CSI-RS resource. As another example, in the case of a semi-persistent intra- / inter-frequency measurement CSI-RS resource for LTM purposes, the UE counts the active duration of the resource from the end of the time when the activation command is applied to the end of the time when the deactivation command is applied. As another example, in the case of periodic intra- / inter-frequency measurement CSI-RS resources for LTM purposes, the terminal counts the active duration of the resource from the time the resource is configured by higher layer signaling to the time the configuration is released.

[0211] Case 2. When the number of active resources for CSI-RS set for LTM is counted separately from the number of existing active CSI-RS port(s) / resource(s)

[0212] Case 2-1. Count intra- / inter-frequency measurements together

[0213] When the above proposed [Method 1-2] is applied, the terminal may count the intra- / inter-frequency measurement CSI-RS resource for LTM purposes by including the resource in the number of separate active CSI-RS port(s) / resource(s) based on the active duration determined according to the resource type (e.g., periodic / aperiodic / SPS) of the resource. For example, the terminal may be configured with multiple active CSI-RS resource / port count values ​​(counters), and the first active CSI-RS resource / port counter is for counting the existing CSI-RS as shown in Table 3, and the newly added second active CSI-RS resource / port counter is for counting the (intra / inter-frequency measurement) CSI-RS resource / port for LTM. Meanwhile, a resource counter and a port counter may be included for each counter.

[0214] In this way, when counting the active number of CSI-RS resource(s) / port(s) for LTM separately from the existing active number of CSI-RS resource(s) / port(s) of active BWP, the UE may report the maximum active number of CSI-RS resource(s) / port(s) for LTM to the base station in advance through separate capability signaling, and apply the counting method described below based on that value.

[0215] And / or, in case of counting the active number of CSI-RS resource(s) / port(s) for LTM separately from the existing active number of CSI-RS resource(s) / port(s) of active BWP, the UE derives the maximum active number of CSI-RS resource(s) / port(s) for LTM in advance based on the active number of CSI-RS resource(s) / port(s) reported as a capability to the existing base station, and even if separate capability signaling is not performed to the base station, the base station can derive it based on the previously reported capability value. The above-described counting method can be applied based on that value.

[0216] And / or the terminal may be expected to report to the serving cell if the counted active resources exceed a separate active CSI-RS resource capability and / or not measure / report the active resources.

[0217] Case 2-2. Intra-frequency measurement is counted in the number of existing active CSI-RS ports(s) / resources(s), and inter-frequency measurement is counted separately.

[0218] When the above proposed [Method 1-2] is applied, the terminal can count the resource by including it in the number of existing active CSI-RS port(s) / resource(s) based on the active duration determined according to the resource type (e.g., periodic / aperiodic / SPS) of the intra-frequency measurement CSI-RS resource for LTM purposes.

[0219] When the above proposed [Method 1-2] is applied, the terminal can count the resource by including it in the number of separate active CSI-RS port(s) / resource(s) based on the active duration determined according to the resource type (e.g., periodic / aperiodic / SPS) of the inter-frequency measurement CSI-RS resource for LTM purposes.

[0220] For example, a terminal may be configured with multiple active CSI-RS resource / port count values ​​(counters), and a first active CSI-RS resource / port counter is for counting intra-frequency measurement CSI-RS resource / ports for existing CSI-RS and LTM as shown in Table 3, and a newly added second active CSI-RS resource / port counter is for counting inter-frequency measurement CSI-RS resource / ports for LTM included in the first measurement interval. Meanwhile, each counter may include a resource counter and a port counter.

[0221] In this way, when counting the active number of CSI-RS resource(s) / port(s) for LTM separately from the existing active number of CSI-RS resource(s) / port(s) of active BWP, the UE may report the maximum active number of CSI-RS resource(s) / port(s) for LTM to the base station in advance through separate capability signaling, and apply the counting method described below based on that value.

[0222] And / or, in case of counting the active number of CSI-RS resource(s) / port(s) for LTM separately from the existing active number of CSI-RS resource(s) / port(s) of active BWP, the UE derives the maximum active number of CSI-RS resource(s) / port(s) for LTM in advance based on the active number of CSI-RS resource(s) / port(s) reported as a capability to the existing base station, and even if separate capability signaling is not performed to the base station, the base station can derive it based on the previously reported capability value. The above-described counting method can be applied based on that value.

[0223] And / or the terminal may be expected to report to the serving cell if the counted active resources exceed a separate active CSI-RS resource capability and / or not measure / report the active resources.

[0224] [Method 2] A method of setting / instructing the terminal to measure only the resources of candidate cells with activated TCI state ID among the CSI-RS measurement resources of candidate cells set for LTM purposes.

[0225] We propose a method for configuring / instructing a terminal to measure only the resources of candidate cells with activated TCI state ID among the CSI-RS resources of candidate cells set by LTM CSI configuration.

[0226] In the following description, the resource of a candidate cell with an activated TCI state ID may refer to a case where a TCI state activation instruction exists for the corresponding cell, but may also refer to a case where a TCI state ID associated with a specific LTM CSI-RS resource is activated. Furthermore, the activation of a TCI state ID may mean that the TCI state with that ID is activated.

[0227] Scenario 1. If TCI state activation is indicated for candidate cell(s),

[0228] Case 1. If the CSI-RS configured for LTM includes both intra- and inter-frequency measurements in the number of existing active CSI-RS port(s) / resource(s)

[0229] When the above proposed method is applied, the terminal may count the resource based on the active duration determined according to the resource type (e.g., periodic / aperiodic / SPS) of the resource only when the intra- / inter-frequency measurement CSI-RS resource for LTM purpose is set and TCI state activation is indicated for the candidate cell to which the resource belongs.

[0230] For example, if the TCI state is activated for the candidate cell (or the LTM CSI-RS resource of the cell), and the resource is currently in the active duration, it can be counted as the number of active CSI-RS port(s) / resource(s) (e.g., Table 3). Conversely, if the TCI state is not activated (regardless of whether the resource is currently in the active duration), it may not be counted as the number of active CSI-RS port(s) / resource(s) (e.g., Table 3). Counting of CSI-RS resources / ports for LTM can be performed regardless of intra- / inter-frequency measurement.

[0231] For example, in the case of an aperiodic intra- / inter-frequency measurement CSI-RS resource for LTM purposes, the UE counts the active duration of the resource from the end of the PDCCH containing the request to the end of the scheduled PUSCH containing the report for the CSI-RS resource. As another example, in the case of a semi-persistent intra- / inter-frequency measurement CSI-RS resource for LTM purposes, the UE counts the active duration of the resource from the end of the time when the activation command is applied to the end of the time when the deactivation command is applied. As another example, in the case of a periodic intra- / inter-frequency measurement CSI-RS resource for LTM purposes, the UE counts the active duration of the resource from the time when the resource is configured by higher layer singaling to the time when the configuration is released.

[0232] And / or, if intra- / inter-frequency measurement CSI-RS resources for LTM purposes are configured, if TCI state activation is not indicated or deactivation is performed for the candidate cell to which the resources belong, the terminal may not be expected to measure / report the resources, and / or may not include them in the counting of the number of existing active CSI-RS port(s) / resource(s).

[0233] Case 2. If the CSI-RS set for LTM is counted as an intra-frequency measurement, it is included in the number of existing active CSI-RS ports(s) / resource(s).

[0234] Case 2-1. Not counted in case of inter-frequency measurement.

[0235] When the above proposed method is applied, the terminal can count the resource by including it in the number of existing active CSI-RS port(s) / resource(s) based on the active duration determined according to the resource type (e.g., periodic / aperiodic / SPS) of the resource only when the intra-frequency measurement CSI-RS resource for LTM purpose is set and TCI state activation is indicated for the candidate cell to which the resource belongs.

[0236] For example, inter-frequency measurement CSI-RS resources may not be counted.

[0237] Case 2-2. In case of inter-frequency measurement, separate capability signaling is introduced and counted separately.

[0238] When the above proposed method is applied, the terminal can count the resource by including it in the number of existing active CSI-RS port(s) / resource(s) based on the active duration determined according to the resource type (e.g., periodic / aperiodic / SPS) of the resource only when the intra-frequency measurement CSI-RS resource for LTM purpose is set and TCI state activation is indicated for the candidate cell to which the resource belongs.

[0239] When an inter-frequency measurement CSI-RS resource for LTM purposes is configured, the terminal can count the resource based on the active duration determined according to the resource type (e.g., periodic / aperiodic / SPS) of the resource only when TCI state activation is indicated for the candidate cell to which the resource belongs. For example, the terminal may configure multiple active CSI-RS resource / port count values ​​(counters), and the first active CSI-RS resource / port counter is for counting the intra-frequency measurement CSI-RS resource / port for the existing CSI-RS and LTM as shown in Table 3, and the newly added second active CSI-RS resource / port counter is for counting the inter-frequency measurement CSI-RS resource / port for LTM. Meanwhile, a resource counter and a port counter may be included for each counter. At this time, when counting the active number of CSI-RS resource(s) / port(s) for LTM separately from the existing active number of CSI-RS resource(s) / port(s) of active BWP, the UE may report the maximum active number of CSI-RS resource(s) / port(s) for LTM to the base station in advance through separate capability signaling, and apply the counting method described below based on that value.And / or when counting the active number of CSI-RS resource(s) / port(s) for LTM separately from the existing active number of CSI-RS resource(s) / port(s) of active BWP, the UE derives the maximum active number of CSI-RS resource(s) / port(s) for LTM based on the active number of CSI-RS resource(s) / port(s) previously reported as a capability to the existing base station, and the base station can derive it based on the previously reported capability value even without performing separate capability signaling to the base station. The counting method described above can be applied based on that value. And / or, the UE can be expected to report to the serving cell and / or not measure / report the corresponding active resource if the counted active resource exceeds a separate active CSI-RS resource capability.

[0240] Case 2-3. In case of inter-frequency measurement, existing / separate count is applied only when the resource is guaranteed measurement by a specific measurement interval in [Method 1-1].

[0241] When the above proposed method is applied, the terminal can count the resource by including it in the number of existing active CSI-RS port(s) / resource(s) based on the active duration determined according to the resource type (e.g., periodic / aperiodic / SPS) of the resource only when the intra-frequency measurement CSI-RS resource for LTM purpose is set and TCI state activation is indicated for the candidate cell to which the resource belongs.

[0242] If the terminal has an inter-frequency measurement CSI-RS resource set for LTM purposes within the first measurement interval of [Method 1-1] and TCI state activation is indicated for the candidate cell to which the resource belongs, the terminal may count the resource based on the active duration determined according to the resource type (e.g., periodic / aperiodic / SPS) of the resource in the number of existing / separate active CSI-RS port(s) / resource(s).

[0243] For example, if an LTM CSI-RS resource is (i) for intra-frequency measurement, it may be counted as active CSI-RS port(s) / resource(s) based on TCI state activation and active duration, and if it is (ii) for inter-frequency measurement, it may be counted as active CSI-RS port(s) / resource(s) based on TCI state activation, the first measurement interval, and the active duration.

[0244] And / or, if the intra- / inter-frequency measurement CSI-RS resource for LTM purpose is set and TCI state activation is not indicated or deactivated for the candidate cell to which the resource belongs, the terminal may not be expected to measure / report the resource regardless of whether it exists within the first measurement interval of [Method 1-1], and / or may not include it in the counting of the number of existing / separate active CSI-RS port(s) / resource(s).

[0245] Case 3. When the number of active resources for CSI-RS set for LTM is counted separately from the number of existing active CSI-RS port(s) / resource(s)

[0246] For example, a method is proposed to count CSI-RS for LTM separately from the number of existing active CSI-RS port(s) / resource(s) (e.g., Table 3). When performing LTM measurement, the UE has not yet performed cell switching to a candidate cell but is still operating in the existing serving cell, and it is necessary to perform reception / measurement operations for the existing CSI-RS for non-LTM purposes (referred to as non-LTM CSI-RS for convenience) configured in the serving cell. However, when the CSI-RSs of multiple candidate cells for LTM are configured and counted together with the non-LTM CSI-RS (e.g., counted with the same counter value), the maximum number of resources / ports reported by the UE in its Capability may frequently be exceeded. In such a situation where the UE exceeds its Capability, a problem may arise in which correct measurement / reporting of non-LTM CSI-RS cannot be guaranteed. As an example to address this issue, a method has been proposed to count the number of active ports / resources for (at least some) LTM CSI-RSs separately from non-LTM CSI-RSs. To achieve this separate counting, the number of active (simultaneous) CSI-RS resources / ports supported by the terminal for LTM could be additionally reported as a capability.

[0247] Case 3-1. Count intra- / inter-frequency measurements together

[0248] When the above proposed method is applied, the terminal can count the resource in the number of separate active CSI-RS resources / ports based on the active duration determined according to the resource type (e.g., periodic / aperiodic / SPS) of the resource only when the intra- / inter-frequency measurement CSI-RS resource for LTM purpose is set and TCI state activation is indicated for the candidate cell to which the resource belongs.

[0249] In this way, intra- / inter-frequency measurement CSI-RS resources of a candidate cell / base station for LTM can be counted together without distinction of intra- / inter-frequency under the conditions of TCI state activation and active duration, and a separate active CSI-RS port(s) / resource(s) counter for LTM (e.g., the second counter) can be additionally set to the existing active CSI-RS port(s) / resource(s) counter (e.g., the first counter as in Table 3). Meanwhile, each counter can include a resource counter and a port counter.

[0250] In this way, when counting the active number of CSI-RS resource(s) / port(s) for LTM separately from the existing active number of CSI-RS resource(s) / port(s) of active BWP, the UE may report the maximum active number of CSI-RS resource(s) / port(s) for LTM to the base station in advance through separate capability signaling, and apply the counting method described below based on that value. And / or, when counting the active number of CSI-RS resource(s) / port(s) for LTM separately from the existing active number of CSI-RS resource(s) / port(s) of active BWP, the UE may derive the maximum active number of CSI-RS resource(s) / port(s) for LTM based on the active number of CSI-RS resource(s) / port(s) previously reported to the base station as a capability, and the base station may derive it based on the previously reported capability value even without performing separate capability signaling to the base station. Based on that value, the counting method described above can be applied.

[0251] And / or the terminal may be expected to report to the serving cell if the counted active resources exceed a separate active CSI-RS resource capability and / or not measure / report the active resources.

[0252] Case 3-2. Count intra- and inter-frequency measurements separately.

[0253] When the above proposed method is applied, if an intra-frequency measurement CSI-RS resource for LTM purpose is configured and TCI state activation is indicated for the candidate cell to which the resource belongs, the UE may count the resource by including it in the number of active CSI-RS resources / ports separately (e.g., a second counter separate from the existing first counter described in Table 3) based on the active duration determined according to the resource type (e.g., periodic / aperiodic / SPS) of the resource. In this case, if the active number of CSI-RS resource(s) / port(s) for LTM is counted separately from the existing active number of CSI-RS resource(s) / port(s) of active BWP, the UE may report the maximum active number of CSI-RS resource(s) / port(s) for LTM to the base station in advance through separate capability signaling, and apply the counting method described below based on that value. And / or, when counting the active number of CSI-RS resource(s) / port(s) for LTM separately from the existing active number of CSI-RS resource(s) / port(s) of active BWP, the UE derives the maximum active number of CSI-RS resource(s) / port(s) for LTM in advance based on the active number of CSI-RS resource(s) / port(s) reported as a capability to the existing base station, and the base station can derive it based on the previously reported capability value even without performing separate capability signaling to the base station.Based on that value, the counting method described above can be applied. And / or, the terminal can be expected to report to the serving cell if the counted active resource exceeds a separate active CSI-RS resource capability and / or not measure / report the active resource.

[0254] When an inter-frequency measurement CSI-RS resource for LTM purposes is configured, the UE may count the resource by including it in the number of active CSI-RS resources / ports separately based on the active duration determined according to the resource type (e.g., periodic / aperiodic / SPS) only when TCI state activation is indicated for the candidate cell to which the resource belongs (e.g., the third counter). In this case, when counting the active number of CSI-RS resource(s) / port(s) for LTM separately from the existing active number of CSI-RS resource(s) / port(s) of active BWP, the UE may report the maximum active number of CSI-RS resource(s) / port(s) for LTM to the base station in advance through separate capability signaling, and apply the counting method described below based on that value. And / or, in case of counting the active number of CSI-RS resource(s) / port(s) for LTM separately from the existing active number of CSI-RS resource(s) / port(s) of active BWP, the UE derives the maximum active number of CSI-RS resource(s) / port(s) for LTM in advance based on the active number of CSI-RS resource(s) / port(s) reported as a capability to the existing base station, and even if separate capability signaling is not performed to the base station, the base station can derive it based on the previously reported capability value. The above-described counting method can be applied based on that value.And / or the terminal may be expected to report to the serving cell if the counted active resources exceed a separate active CSI-RS resource capability and / or not measure / report the active resources.

[0255] And / or, if intra- / inter-frequency measurement CSI-RS resources for LTM purposes are configured, if TCI state activation is not indicated or deactivation is performed for the candidate cell to which the resources belong, the terminal may not be expected to measure / report the resources, and / or may not include them in the counting of the number of separate active CSI-RS port(s) / resource(s).

[0256] Scenario 2. If no candidate cell's TCI state ID is activated,

[0257] (As an additional method for Scenario 1 or as a separate method from Scenario 1) If none of the candidate cells of the UE has TCI state activated (and / or the TCI state is not activated for any LTM CSI-RS resource), the proposed [Method 1] may be followed. The operation of the UE for each of the following cases may be proposed as follows.

[0258] Scenario 2-1. If the above proposed [Method 1-1] is applied,

[0259] Case 1. If the CSI-RS configured for LTM includes both intra- and inter-frequency measurements in the number of existing active CSI-RS port(s) / resource(s):

[0260] In case the above proposed [Method 1-1] is applied, if an intra-frequency measurement CSI-RS resource for LTM purpose is set, the terminal can count the resource by including it in the number of existing active CSI-RS port(s) / resource(s) based on the active duration determined according to the resource type (e.g., periodic / aperiodic / SPS) of the resource, regardless of whether the resource exists within the first proposed measurement interval (e.g., even if it does not exist within the first measurement interval). If an inter-frequency measurement CSI-RS resource for LTM purpose is set within the first proposed measurement interval, the terminal can count the resource by including it in the number of existing active CSI-RS port(s) / resource(s) according to the rule of active CSI-RS port(s) / resource(s) determined according to the resource type (e.g., periodic / aperiodic / SPS) of the resource. If the inter-frequency measurement CSI-RS resource is not included in the first measurement interval, the terminal may not count the inter-frequency measurement CSI-RS resource in the number of existing active CSI-RS port(s) / resource(s) (regardless of the active duration or without determining whether the active duration exists).

[0261] Case 2. If the CSI-RS set for LTM is counted as an intra-frequency measurement, it is included in the number of existing active CSI-RS ports(s) / resource(s).

[0262] Case 2-1. In case of inter-frequency measurement, separate capability signaling is introduced and counted separately.

[0263] In case the above proposed [Method 1-1] is applied, if an intra-frequency measurement CSI-RS resource for LTM purpose is configured, the terminal can count the resource by including it in the number of existing active CSI-RS port(s) / resource(s) based on the active duration determined according to the resource type (e.g., periodic / aperiodic / SPS) of the resource, regardless of whether the resource exists within the first proposed measurement interval (e.g., even if it does not exist within the first measurement interval). If an inter-frequency measurement CSI-RS resource for LTM purpose is configured, the terminal can count the resource by including it in the number of separate active CSI-RS resources / ports based on the active duration determined according to the resource type (e.g., periodic / aperiodic / SPS) of the resource, only if the resource exists within the first proposed measurement interval. For example, a terminal may be configured with multiple active CSI-RS resource / port count values ​​(counters), and a first active CSI-RS resource / port counter is for counting intra-frequency measurement CSI-RS resource / ports for existing CSI-RS and LTM as shown in Table 3, and a newly added second active CSI-RS resource / port counter is for counting inter-frequency measurement CSI-RS resource / ports for LTM included in the first measurement interval. Meanwhile, each counter may include a resource counter and a port counter.

[0264] In this way, when counting the active number of CSI-RS resource(s) / port(s) for LTM separately from the existing active number of CSI-RS resource(s) / port(s) of active BWP, the UE may report the maximum active number of CSI-RS resource(s) / port(s) for LTM to the base station in advance through separate capability signaling, and apply the counting method described below based on that value.

[0265] And / or, in case of counting the active number of CSI-RS resource(s) / port(s) for LTM separately from the existing active number of CSI-RS resource(s) / port(s) of active BWP, the UE derives the maximum active number of CSI-RS resource(s) / port(s) for LTM in advance based on the active number of CSI-RS resource(s) / port(s) reported as a capability to the existing base station, and even if separate capability signaling is not performed to the base station, the base station can derive it based on the previously reported capability value. The above-described counting method can be applied based on that value.

[0266] And / or the terminal may be expected to report to the serving cell if the counted active resources exceed a separate active CSI-RS resource capability and / or not measure / report the active resources.

[0267] Case 2-2. In case of inter-frequency measurement, existing / separate count is applied only when the resource is guaranteed measurement by a specific measurement interval in [Method 1-1].

[0268] In case the above proposed [Method 1-1] is applied, if an intra-frequency measurement CSI-RS resource for LTM purpose is configured, the terminal can count the resource by including it in the number of existing active CSI-RS port(s) / resource(s) based on the active duration determined according to the resource type (e.g., periodic / aperiodic / SPS) of the resource, regardless of whether the resource exists within the first proposed measurement interval (e.g., even if it does not exist within the first measurement interval). If an inter-frequency measurement CSI-RS resource for LTM purpose is configured, the terminal can count the resource by including it in the number of existing / separate active CSI-RS port(s) / resource(s) based on the active duration determined according to the resource type (e.g., periodic / aperiodic / SPS) of the resource, only if the resource exists within the first proposed measurement interval.

[0269] Case 3. When the number of active resources for CSI-RS set for LTM is counted separately from the number of existing active CSI-RS port(s) / resource(s)

[0270] For example, a method is proposed to count CSI-RS for LTM separately from the number of existing active CSI-RS port(s) / resource(s) (e.g., Table 3). When performing LTM measurement, the UE has not yet performed cell switching to a candidate cell but is still operating in the existing serving cell, and it is necessary to perform reception / measurement operations for the existing CSI-RS for non-LTM purposes (referred to as non-LTM CSI-RS for convenience) configured in the serving cell. However, when the CSI-RSs of multiple candidate cells for LTM are configured and counted together with the non-LTM CSI-RS (e.g., counted with the same counter value), the maximum number of resources / ports reported by the UE in its Capability may frequently be exceeded. In such a situation where the UE exceeds its Capability, a problem may arise in which correct measurement / reporting of non-LTM CSI-RS cannot be guaranteed. As an example to address this issue, a method has been proposed to count the number of active ports / resources for (at least some) LTM CSI-RSs separately from non-LTM CSI-RSs. To achieve this separate counting, the number of active (simultaneous) CSI-RS resources / ports supported by the terminal for LTM could be additionally reported as a capability.

[0271] Case 3-1. Count intra- / inter-frequency measurements together

[0272] In case the above proposed [Method 1-1] is applied, if an intra- / inter-frequency measurement CSI-RS resource for LTM purpose is set, the terminal can count the resource by including it in the number of separate active CSI-RS port(s) / resource(s) according to the resource type (e.g., periodic / aperiodic / SPS) of the resource, regardless of whether the resource exists within the first measurement interval proposed above (e.g., even if it does not exist within the first measurement interval).

[0273] In this way, intra- / inter-frequency measurement CSI-RS resources of a candidate cell / base station for LTM can be counted together without distinction between intra- / inter-frequency, and a separate active CSI-RS port(s) / resource(s) counter for LTM (e.g., the second counter) can be additionally set to the existing active CSI-RS port(s) / resource(s) counter (e.g., the first counter as in Table 3). Meanwhile, each counter can include a resource counter and a port counter.

[0274] If the active number of CSI-RS resource(s) / port(s) for LTM is counted separately from the existing active number of CSI-RS resource(s) / port(s) of active BWP, the UE may report the maximum active number of CSI-RS resource(s) / port(s) for LTM to the base station in advance through separate capability signaling, and apply the counting method described below based on that value.

[0275] And / or, in case of counting the active number of CSI-RS resource(s) / port(s) for LTM separately from the existing active number of CSI-RS resource(s) / port(s) of active BWP, the UE derives the maximum active number of CSI-RS resource(s) / port(s) for LTM in advance based on the active number of CSI-RS resource(s) / port(s) reported as a capability to the existing base station, and even if separate capability signaling is not performed to the base station, the base station can derive it based on the previously reported capability value. The above-described counting method can be applied based on that value.

[0276] And / or the terminal may be expected to report to the serving cell if the counted active resources exceed a separate active CSI-RS resource capability and / or not measure / report the active resources.

[0277] Case 3-2. Count intra- and inter-frequency measurements separately.

[0278] In case the above proposed [Method 1-1] is applied, if an intra-frequency measurement CSI-RS resource for LTM purpose is configured, the UE may count the resource by including it in the number of active CSI-RS port(s) / resource(s) separately (e.g., separate from the existing first counter described in Table 3) based on the active duration determined according to the resource type (e.g., periodic / aperiodic / SPS) of the resource, regardless of whether the resource exists within the first measurement interval proposed above (e.g., even if it does not exist within the first measurement interval) (e.g., a second counter). In this case, if the active number of CSI-RS resource(s) / port(s) for LTM is counted separately from the existing active number of CSI-RS resource(s) / port(s) of active BWP, the UE may report the maximum active number of CSI-RS resource(s) / port(s) for LTM to the base station in advance through separate capability signaling, and apply the counting method described below based on the value. And / or, when counting the active number of CSI-RS resource(s) / port(s) for LTM separately from the existing active number of CSI-RS resource(s) / port(s) of active BWP, the UE derives the maximum active number of CSI-RS resource(s) / port(s) for LTM in advance based on the active number of CSI-RS resource(s) / port(s) reported as a capability to the existing base station, and the base station can derive it based on the previously reported capability value even without performing separate capability signaling to the base station.Based on that value, the counting method described above can be applied. And / or, the terminal can be expected to report to the serving cell if the counted active resource exceeds a separate active CSI-RS resource capability and / or not measure / report the active resource.

[0279] In case option 1 and / or option 2 of the above proposed [Method 1-1] are applied, if an inter-frequency measurement CSI-RS resource for LTM purpose is configured, the terminal may count the resource by including it in the number of separate active CSI-RS port(s) / resource(s) based on the active duration determined according to the resource type (e.g., periodic / aperiodic / SPS) of the resource, regardless of whether the resource exists within the proposed first measurement interval (e.g., even if the resource does not exist within the first measurement interval) or only if the resource exists within the first measurement interval (e.g., third counter). At this time, when counting the active number of CSI-RS resource(s) / port(s) for LTM separately from the existing active number of CSI-RS resource(s) / port(s) of active BWP, the UE may report the maximum active number of CSI-RS resource(s) / port(s) for LTM to the base station in advance through separate capability signaling, and apply the counting method described below based on that value.And / or when counting the active number of CSI-RS resource(s) / port(s) for LTM separately from the existing active number of CSI-RS resource(s) / port(s) of active BWP, the UE derives the maximum active number of CSI-RS resource(s) / port(s) for LTM based on the active number of CSI-RS resource(s) / port(s) previously reported as a capability to the existing base station, and the base station can derive it based on the previously reported capability value even without performing separate capability signaling to the base station. The counting method described above can be applied based on that value. And / or, the UE can be expected to report to the serving cell and / or not measure / report the corresponding active resource if the counted active resource exceeds a separate active CSI-RS resource capability.

[0280] Scenario 2-2. If the above proposed [Method 1-2] is applied,

[0281] Case 1. If the CSI-RS configured for LTM includes both intra- and inter-frequency measurements in the number of existing active CSI-RS port(s) / resource(s)

[0282] When the above proposed [Method 1-2] is applied, the terminal can count the resource by including it in the number of existing active CSI-RS port(s) / resource(s) based on the active duration determined according to the resource type (e.g., periodic / aperiodic / SPS) of the intra- / inter-frequency measurement CSI-RS resource for LTM purposes.

[0283] Case 2. When the number of active resources for CSI-RS set for LTM is counted separately from the number of existing active CSI-RS port(s) / resource(s)

[0284] For example, a method is proposed to count CSI-RS for LTM separately from the number of existing active CSI-RS port(s) / resource(s) (e.g., Table 3). When performing LTM measurement, the UE has not yet performed cell switching to a candidate cell but is still operating in the existing serving cell, and it is necessary to perform reception / measurement operations for the existing CSI-RS for non-LTM purposes (referred to as non-LTM CSI-RS for convenience) configured in the serving cell. However, when the CSI-RSs of multiple candidate cells for LTM are configured and counted together with the non-LTM CSI-RS (e.g., counted with the same counter value), the maximum number of resources / ports reported by the UE in its Capability may frequently be exceeded. In such a situation where the UE exceeds its Capability, a problem may arise in which correct measurement / reporting of non-LTM CSI-RS cannot be guaranteed. As an example to address this issue, a method has been proposed to count the number of active ports / resources for (at least some) LTM CSI-RSs separately from non-LTM CSI-RSs. To achieve this separate counting, the number of active (simultaneous) CSI-RS resources / ports supported by the terminal for LTM could be additionally reported as a capability.

[0285] Case 2-1. Count intra- / inter-frequency measurements together

[0286] When the above proposed [Method 1-2] is applied, the terminal may count the intra- / inter-frequency measurement CSI-RS resource for LTM purposes by including the resource in the number of separate active CSI-RS port(s) / resource(s) based on the active duration determined according to the resource type (e.g., periodic / aperiodic / SPS) of the resource. For example, the terminal may be configured with multiple active CSI-RS resource / port count values ​​(counters), and the first active CSI-RS resource / port counter is for counting the existing CSI-RS as shown in Table 3, and the newly added second active CSI-RS resource / port counter is for counting the (intra / inter-frequency measurement) CSI-RS resource / port for LTM. Meanwhile, a resource counter and a port counter may be included for each counter.

[0287] In this way, a separate active CSI-RS resource is based on the capability reported by the terminal to the serving cell, and the terminal can be expected to ensure that the counted active resources do not exceed the separate active CSI-RS resource capability.

[0288] And / or the terminal may be expected to report to the serving cell if the counted active resources exceed a separate active CSI-RS resource capability and / or not measure / report the active resources.

[0289] Case 2-2. Intra-frequency measurement is counted in the number of existing active CSI-RS ports(s) / resources(s), and inter-frequency measurement is counted separately.

[0290] In case the above proposed [Method 1-2] is applied, if an intra-frequency measurement CSI-RS resource for LTM purposes is configured, the terminal can count the resource by including the resource in the number of existing active CSI-RS port(s) / resource(s) based on the active duration determined according to the resource type (e.g., periodic / aperiodic / SPS) of the corresponding resource. If an inter-frequency measurement CSI-RS resource for LTM purposes is configured, the terminal can count the resource by including the resource in the number of separate active CSI-RS port(s) / resource(s) based on the active duration determined according to the resource type (e.g., periodic / aperiodic / SPS) of the corresponding resource.

[0291] For example, a terminal may be configured with multiple active CSI-RS resource / port count values ​​(counters), and a first active CSI-RS resource / port counter is for counting intra-frequency measurement CSI-RS resource / ports for existing CSI-RS and LTM as shown in Table 3, and a newly added second active CSI-RS resource / port counter is for counting inter-frequency measurement CSI-RS resource / ports for LTM included in the first measurement interval. Meanwhile, each counter may include a resource counter and a port counter.

[0292] In this way, a separate active CSI-RS resource is based on the capability reported by the terminal to the serving cell, and the terminal can be expected to ensure that the counted active resources do not exceed the separate active CSI-RS resource capability.

[0293] And / or the terminal may be expected to report to the serving cell if the counted active resources exceed a separate active CSI-RS resource capability and / or not measure / report the active resources.

[0294] Figure 7 is a diagram illustrating operations performed by a terminal and a network according to one embodiment. Figure 7 is an implementation example based on at least some of the methods / options / proposals described above. Even without a separate description, the previously described contents may be referenced to aid in understanding Figure 7.

[0295] Referring to FIG. 7, a terminal may transmit a terminal capability report to a network (A05). The terminal capability report may be transmitted via higher layer signaling. The terminal capability report may include information on CSI-RSs (e.g., active CSI-RSs) that the terminal can simultaneously support. The terminal may report information on the number of CSI-RS ports and the number of CSI-RS resources. For example, the terminal may report information on the number of CSI-RS ports and the number of CSI-RS resources supported for LTM and information on the number of CSI-RS ports and the number of CSI-RS resources (of the existing Rel. 18) supported for non-LTM. These CSI-RSs may be related to NZP CSI-RSs.

[0296] The terminal may receive CSI-RS resource configuration information through at least one higher layer signaling (A10). For example, the terminal may receive first CSI-RS resource configuration(s) for non-LTM. The terminal may receive second CSI-RS resource configuration(s) for LTM. The second CSI-RS resource configuration(s) may include CSI-RS resource configuration(s) of candidate cells for LTM.

[0297] The terminal may receive at least one CSI-RS from a corresponding cell (e.g., a serving cell or an LTM candidate cell) based on at least one CSI-RS resource configuration (A20) and perform a measurement based thereon (A25). The measurement performed at the terminal may include, for example, at least one of a measurement for CSI based on the first CSI-RS resource configuration(s), a beam measurement (e.g., L1-RSRP / SINR) and / or an RRM measurement, and an L1 measurement (e.g., L1-RSRP / SINR) for a candidate cell based on the second CSI-RS resource configuration(s).

[0298] The CSI-RS measured by the terminal may be an active CSI-RS. The terminal may be restricted / configured to not have more active CSI-RS(es) than the number of CSI-RS resources or CSI-RS ports reported by the terminal through the terminal capability report. Active CSI-RSs are divided into active CSI-RSs for LTM and CSI-RSs for non-LTM, and the number of ports / resources may be counted separately for each.

[0299] The terminal can report measurement results to the network (A30). For convenience of explanation, the measurement result report is assumed to be an L1 measurement report for LTM.

[0300] 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.

[0301] The terminal can perform a cell switch to the corresponding candidate cell based on the cell switch command (A40).

[0302] Figure 8 illustrates a flowchart of a method performed by a terminal according to one embodiment. Figure 8 is an example implementation based on at least some of the methods / options / suggestions described above, and even without separate description, the previously described contents may be referenced to aid in understanding Figure 8.

[0303] Referring to FIG. 8, a terminal can receive multiple CSI-RS (channel state information-reference signal) resource settings through upper layer signaling (B05).

[0304] The terminal can perform CSI-RS measurement based on at least one of the plurality of CSI-RS resource settings (B10).

[0305] The terminal can transmit a measurement report based on the CSI-RS measurement (B15).

[0306] The above multiple CSI-RS resource settings may include CSI-RS resource settings for LTM (lower-layer triggered mobility).

[0307] Among the plurality of CSI-RS resource configurations, the second active CSI-RSs related to the CSI-RS resource configurations for the LTM may be counted separately from the first active CSI-RSs related to the remaining CSI-RS resource configurations. The number of ports of the first active CSI-RSs may be counted separately from the number of ports of the second active CSI-RSs, and the number of resources of the first active CSI-RSs may be counted separately from the number of resources of the second active CSI-RSs.

[0308] The CSI-RS resource settings for the above LTM may be CSI-RS resource settings of candidate cells for LTM-based cell switching.

[0309] The terminal may transmit a terminal capability report to the network. The terminal capability report may include (i) first information regarding the number of first resources and the number of first ports supported by the terminal for the first active CSI-RSs, and (ii) second information regarding the number of second resources and the number of second ports supported by the terminal for the second active CSI-RSs.

[0310] The first active CSI-RSs of the terminal may not exceed the first number of resources or the first number of ports, and the second active CSI-RSs of the terminal may not exceed the second number of resources or the second number of ports.

[0311] The terminal may perform the CSI-RS measurement for at least one of the second active CSI-RSs during a specific time interval.

[0312] During the above specific time period, the terminal can perform the CSI-RS measurement without transmitting or receiving a signal to the serving cell.

[0313] The above specific time interval can be determined based on a time offset for the CSI-RS resource.

[0314] The terminal may perform the CSI-RS measurement for at least one of the second active CSI-RSs based on activation of a transmission configuration indicator (TCI) state for LTM.

[0315] Figure 9 illustrates a flowchart of a method performed by a base station according to one embodiment. Figure 9 is an implementation example based on at least some of the methods / options / suggestions described above, and even without separate description, the previously described contents may be referenced to aid in understanding Figure 9.

[0316] Referring to FIG. 9, a base station can transmit multiple CSI-RS (channel state information-reference signal) resource settings to a terminal through upper layer signaling (C05).

[0317] The base station can receive a measurement report for CSI-RS measurement of the terminal (C10).

[0318] The above multiple CSI-RS resource settings may include CSI-RS resource settings for LTM (lower-layer triggered mobility).

[0319] Among the plurality of CSI-RS resource configurations, the second active CSI-RSs related to the CSI-RS resource configurations for the LTM may be counted separately from the first active CSI-RSs related to the remaining CSI-RS resource configurations. The number of ports of the first active CSI-RSs may be counted separately from the number of ports of the second active CSI-RSs, and the number of resources of the first active CSI-RSs may be counted separately from the number of resources of the second active CSI-RSs.

[0320] The CSI-RS resource settings for the above LTM may be CSI-RS resource settings of candidate cells for LTM-based cell switching.

[0321] The base station may receive a terminal capability report from the terminal. The terminal capability report may include (i) first information regarding the number of first resources and the number of first ports supported by the terminal for the first active CSI-RSs, and (ii) second information regarding the number of second resources and the number of second ports supported by the terminal for the second active CSI-RSs.

[0322] The first active CSI-RSs of the terminal may not exceed the first number of resources or the first number of ports, and the second active CSI-RSs of the terminal may not exceed the second number of resources or the second number of ports.

[0323] The CSI-RS measurement may be performed for at least one of the second active CSI-RSs in a specific time interval.

[0324] During the above specific time period, the base station may not transmit or receive a signal to the terminal through the serving cell.

[0325] The above specific time interval can be determined based on a time offset for the CSI-RS resource.

[0326] The CSI-RS measurement may be performed for at least one of the second active CSI-RSs based on activation of a transmission configuration indicator (TCI) state for LTM.

[0327] Fig. 10 illustrates a communication system (1) applicable to the present disclosure.

[0328] Referring to FIG. 10, a 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 a 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 Things) device (100f), and an AI device / server (400). For example, the vehicle may include a vehicle equipped with a wireless communication function, an autonomous vehicle, a vehicle capable of performing vehicle-to-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 HMD (Head-Mounted Device), HUD (Head-Up Display) installed in a vehicle, television, smartphone, computer, wearable device, home appliance, digital signage, vehicle, robot, etc. Mobile devices can include smartphone, smart pad, wearable device (e.g., smart watch, smart glass), computer (e.g., laptop, etc.), etc. Home appliances can include TV, refrigerator, washing machine, etc. IoT devices can include sensors, smart meters, etc. For example, base stations and networks can also be implemented as wireless devices, and a specific wireless device (200a) can act as a base station / network node to other wireless devices.

[0329] Wireless devices (100a to 100f) can be connected to a network (300) via a base station (200). Artificial Intelligence (AI) technology can be applied to the wireless devices (100a to 100f), and the wireless devices (100a to 100f) can be connected to an AI server (400) via the network (300). The network (300) can be configured using a 3G network, a 4G (e.g., LTE) network, a 5G (e.g., NR) network, etc. The wireless devices (100a to 100f) can communicate with each other via the base station (200) / network (300), but can 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). In addition, IoT devices (e.g., sensors) can communicate directly with other IoT devices (e.g., sensors) or other wireless devices (100a to 100f).

[0330] Wireless communication / connection (150a, 150b, 150c) can be established between wireless devices (100a~100f) / base stations (200), and base stations (200) / base stations (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 communication between base stations (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 each other. For example, wireless communication / connection (150a, 150b, 150c) can transmit / receive signals through various physical channels. To this end, at least some of 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.), and resource allocation processes can be performed based on various proposals of the present disclosure.

[0331] Figure 11 illustrates a wireless device applicable to the present disclosure.

[0332] 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)} can correspond to {the wireless device (100x), the base station (200)} and / or {the wireless device (100x), the wireless device (100x)} of FIG. 10.

[0333] A first wireless device (100) includes one or more processors (102) and one or more memories (104), and may further include one or more transceivers (106) and / or one or more antennas (108). The processor (102) controls the memories (104) and / or the transceivers (106), and may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document. For example, the processor (102) may process information in the memory (104) to generate first information / signal, and then transmit a wireless signal including the first information / signal via the transceiver (106). In addition, the processor (102) may receive a wireless signal including second information / signal via the transceiver (106), and then store information obtained from 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 perform some or all of the processes controlled by the processor (102), or may store software code including commands for performing the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. Here, the processor (102) and the memory (104) may be part of a communication modem / circuit / chip designed to implement a 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 via one or more antennas (108). The transceiver (106) may include a transmitter and / or a receiver. The transceiver (106) may be used interchangeably with an RF (Radio Frequency) unit. In the present disclosure, a wireless device may also mean a communication modem / circuit / chip.

[0334] The second wireless device (200) includes one or more processors (202), one or more memories (204), and may further include one or more transceivers (206) and / or one or more antennas (208). The processor (202) controls the memories (204) and / or the transceivers (206), and may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document. For example, the processor (202) may process information in the memory (204) to generate third information / signals, and then transmit a wireless signal including the third information / signals via the transceivers (206). Furthermore, the processor (202) may receive a wireless signal including fourth information / signals via the transceivers (206), and then store information obtained from signal processing of the fourth information / signals in the memory (204). The memory (204) may be connected to the processor (202) and may store various information related to the operation of the processor (202). For example, the memory (204) may perform some or all of the processes controlled by the processor (202), or may store software code including commands for performing the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. Here, the processor (202) and the memory (204) may be part of a communication modem / circuit / chip designed to implement wireless communication technology (e.g., LTE, NR). The transceiver (206) may be connected to the processor (202) and may transmit and / or receive wireless signals via one or more antennas (208). The transceiver (206) may include a transmitter and / or a receiver. The transceiver (206) may be used interchangeably with an RF unit. In the present disclosure, a wireless device may also mean a communication modem / circuit / chip.

[0335] Hereinafter, the 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 one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts 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 operation flowcharts disclosed in this document. One or more processors (102, 202) can generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data or information according to the functions, procedures, proposals and / or methods disclosed herein, and provide the signals to one or more transceivers (106, 206). One or more processors (102, 202) can receive signals (e.g., baseband signals) from one or more transceivers (106, 206) and obtain PDUs, SDUs, messages, control information, data or information according to the descriptions, functions, procedures, proposals, methods and / or operational flowcharts disclosed herein.

[0336] One or more processors (102, 202) may be referred to as a controller, a microcontroller, a microprocessor, or a 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 operational 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. The descriptions, functions, procedures, suggestions, methods and / or operation flowcharts disclosed in this document may be implemented using firmware or software configured to perform one or more processors (102, 202) or stored in one or more memories (104, 204) and executed by one or more processors (102, 202). The descriptions, functions, procedures, suggestions, methods and / or operation flowcharts disclosed in this document may be implemented using firmware or software in the form of codes, instructions and / or sets of instructions.

[0337] One or more memories (104, 204) may be coupled to one or more processors (102, 202) and may store various forms of data, signals, messages, information, programs, codes, instructions, and / or commands. The one or more memories (104, 204) may be configured as ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer-readable storage media, and / or combinations thereof. The one or more memories (104, 204) may be located internally and / or externally to the one or more processors (102, 202). Additionally, the one or more memories (104, 204) may be coupled to the one or more processors (102, 202) via various technologies, such as wired or wireless connections.

[0338] One or more transceivers (106, 206) can transmit user data, control information, wireless signals / channels, etc., as mentioned in the methods and / or flowcharts of this document, to one or more other devices. One or more transceivers (106, 206) can receive user data, control information, wireless signals / channels, etc., as mentioned in the descriptions, functions, procedures, proposals, methods and / or flowcharts of this document, from one or more other devices. For example, one or more transceivers (106, 206) can be connected to one or more processors (102, 202) and can transmit and receive wireless signals. For example, one or more processors (102, 202) can 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 coupled 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, or the like, as referred to in the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed herein, via 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 received user data, control information, wireless signals / channels, etc. from RF band signals to baseband signals in order to process the received user data, control information, wireless signals / channels, etc. using one or more processors (102, 202).One or more transceivers (106, 206) may convert user data, control information, wireless signals / channels, etc. processed by one or more processors (102, 202) from baseband signals to RF band signals. For this purpose, one or more transceivers (106, 206) may include an (analog) oscillator and / or filter.

[0339] Figure 12 illustrates another example of a wireless device applicable to the present disclosure. The wireless device may be implemented in various forms depending on the use case / service (see Figure 10).

[0340] 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 / units, 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 an additional element (140). The communication unit may include a communication circuit (112) and a 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 the additional elements (140) and controls the overall operation of the wireless device. For example, the control unit (120) may control the electrical / mechanical operation of the wireless device based on the program / code / command / information stored in the memory unit (130). In addition, the control unit (120) may transmit information stored in the memory unit (130) to an external device (e.g., another communication device) via a wireless / wired interface through the communication unit (110), or store information received from an external device (e.g., another communication device) via a wireless / wired interface in the memory unit (130).

[0341] The additional element (140) may be configured in various ways depending on the type of the 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 a financial device), a security device, a climate / environmental device, an AI server / device (Fig. 10, 400), a base station (Fig. 10, 200), a network node, etc. Wireless devices may be mobile or stationary depending on the use / service.

[0342] 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 some may be wirelessly 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 wired, and the control unit (120) and a first unit (e.g., 130, 140) may be wirelessly connected via the communication unit (110). In addition, each element, component, unit / part, and / or module within the wireless device (100, 200) may further include one or more elements. For example, the control unit (120) may be composed of a set of one or more 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.

[0343] Figure 13 illustrates a vehicle or autonomous vehicle applicable to the present disclosure. The vehicle or autonomous vehicle may be implemented as a mobile robot, a car, a train, a manned or unmanned aerial vehicle (AV), a ship, or the like.

[0344] 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 a part of the communication unit (110). Blocks 110 / 130 / 140a to 140d correspond to blocks 110 / 130 / 140 of FIG. 12, respectively.

[0345] 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, road side units, etc.), and servers. The control unit (120) can control elements of the vehicle or autonomous vehicle (100) to perform various operations. The control unit (120) can include an ECU (Electronic Control Unit). The drive unit (140a) can drive the vehicle or autonomous vehicle (100) on the ground. The drive unit (140a) can include an engine, a motor, a power train, wheels, brakes, a steering device, etc. The power supply unit (140b) supplies power to the vehicle or autonomous vehicle (100) and can include a wired / wireless charging circuit, a battery, 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 incline sensor, a weight detection sensor, a heading sensor, a position module, a vehicle forward / backward 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 a technology for maintaining a driving lane, a technology for automatically controlling speed such as adaptive cruise control, a technology for automatically driving along a set path, a technology for automatically setting a path and driving when a destination is set, etc.

[0346] 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 route and driving plan based on the acquired data. The control unit (120) can control the drive unit (140a) so that the vehicle or autonomous vehicle (100) moves along the autonomous driving route according to the driving plan (e.g., speed / direction control). During autonomous driving, the communication unit (110) can irregularly / periodically acquire the latest traffic information data from an external server and can acquire surrounding traffic information data from surrounding vehicles. In addition, 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 route and driving plan based on newly acquired data / information. The communication unit (110) can transmit information regarding the vehicle location, autonomous driving route, driving plan, etc. to the external server. External servers can predict traffic information data in advance using AI technology or other technologies based on information collected from vehicles or autonomous vehicles, and provide the predicted traffic information data to the vehicles or autonomous vehicles.

[0347] The embodiments described above are combinations of components and features of the present disclosure in a predetermined form. Each component or feature should be considered optional unless explicitly stated otherwise. Each component or feature may be implemented without being combined with other components or features. Furthermore, it is also possible to form 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 self-evident that claims that do not have an explicit citation relationship in the patent claims may be combined to form embodiments or incorporated as new claims through post-application amendments.

[0348] It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit or scope of the invention. Therefore, the above detailed description should not be construed as limiting in any respect, but rather as illustrative. The scope of the present invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the scope of equivalents are intended to be included within the scope of the present invention.

[0349] 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 multiple CSI-RS (channel state information-reference signal) resource settings through upper layer signaling; Performing CSI-RS measurement based on at least one of the plurality of CSI-RS resource settings; and Including transmitting a measurement report based on the above CSI-RS measurement, The above multiple CSI-RS resource settings include CSI-RS resource settings for LTM (lower-layer triggered mobility), A method wherein the second active CSI-RSs related to the CSI-RS resource settings for the LTM among the plurality of CSI-RS resource settings are counted separately from the first active CSI-RSs related to the remaining CSI-RS resource settings.

2. In paragraph 1, The number of ports of the first active CSI-RSs is counted separately from the number of ports of the second active CSI-RSs, A method wherein the number of resources of the first active CSI-RSs is counted separately from the number of resources of the second active CSI-RSs.

3. In paragraph 1, The CSI-RS resource settings for the above LTM are CSI-RS resource settings of candidate cells for LTM-based cell switching.

4. In paragraph 1, Further comprising transmitting a terminal capability report, A method wherein the terminal capability report includes (i) first information about the number of first resources and the number of first ports supported by the terminal for the first active CSI-RSs, and (ii) second information about the number of second resources and the number of second ports supported by the terminal for the second active CSI-RSs.

5. In paragraph 4, The first active CSI-RSs of the terminal do not exceed the number of the first resources or the number of the first ports, A method wherein the second active CSI-RSs of the terminal do not exceed the number of the second resources or the number of the second ports.

6. In paragraph 1, A method wherein the terminal performs the CSI-RS measurement for at least one of the second active CSI-RSs in a specific time interval.

7. In paragraph 6, A method in which the terminal performs the CSI-RS measurement without transmitting or receiving a signal to the serving cell during the specific time period.

8. In paragraph 6, A method wherein the above specific time interval is determined based on a time offset for CSI-RS resources.

9. In paragraph 1, A method wherein the terminal performs the CSI-RS measurement for at least one of the second active CSI-RSs based on activation of a transmission configuration indicator (TCI) state for LTM.

10. A non-transitory computer-readable recording medium having recorded thereon a program for performing the method described in paragraph 1.

11. In the device, at least one processor; and At least one memory configured to store instructions that, when executed by said at least one processor, cause said at least one processor to perform operations; The operations of at least one processor are: Receive multiple CSI-RS (channel state information-reference signal) resource settings through upper layer signaling; Performing CSI-RS measurement based on at least one of the plurality of CSI-RS resource settings; and Including transmitting a measurement report based on the above CSI-RS measurement, The above multiple CSI-RS resource settings include CSI-RS resource settings for LTM (lower-layer triggered mobility), A device wherein the second active CSI-RSs related to the CSI-RS resource settings for the LTM among the plurality of CSI-RS resource settings are counted separately from the first active CSI-RSs related to the remaining CSI-RS resource settings.

12. In paragraph 11, The above device further comprises a transmitter and receiver, The above device is a terminal device.

13. In paragraph 11, The above device is a processing device configured to control a terminal.

14. In a method performed by a base station, Transmitting multiple CSI-RS (channel state information-reference signal) resource settings to the terminal through upper layer signaling; and Including receiving a measurement report for CSI-RS measurement of the above terminal, The above multiple CSI-RS resource settings include CSI-RS resource settings for LTM (lower-layer triggered mobility), A method wherein the second active CSI-RSs related to the CSI-RS resource settings for the LTM among the plurality of CSI-RS resource settings are counted separately from the first active CSI-RSs related to the remaining CSI-RS resource settings.

15. At the base station, at least one processor; and At least one memory configured to store instructions that, when executed by said at least one processor, cause said at least one processor to perform operations; The operations of at least one processor are: Transmitting multiple CSI-RS (channel state information-reference signal) resource settings to the terminal through upper layer signaling; and Including receiving a measurement report for CSI-RS measurement of the above terminal, The above multiple CSI-RS resource settings include CSI-RS resource settings for LTM (lower-layer triggered mobility), A base station, wherein the second active CSI-RSs related to the CSI-RS resource settings for the LTM among the plurality of CSI-RS resource settings are counted separately from the first active CSI-RSs related to the remaining CSI-RS resource settings.

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