Method for performing communication in wireless communication system and device therefor

Abstract

A device, according to various embodiments, may: receive a report configuration including information on at least one candidate cell related to L1 / L2 triggered mobility (LTM) and at least one channel measurement resource on the basis of a channel state information-reference signal (CSI-RS) resource; receive interference resource configuration information related to the report configuration; and perform channel measurement or interference measurement on the at least one candidate cell, on the basis of at least one of the report configuration and the interference resource configuration information.

Description

Method for performing communication in a wireless communication system and device therefor

[0001] The present invention relates to a method for a terminal to perform measurement and reporting in a wireless communication system and a device therefor.

[0002] Wireless communication systems are multiple access systems that support communication with multiple users by sharing available system resources (e.g., bandwidth, transmission power, etc.). 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), single carrier frequency division multiple access (SC-FDMA), and multi-carrier frequency division multiple access (MC-FDMA).

[0003] As more and more communication devices demand greater communication capacity, the need for improved mobile broadband communication compared to existing radio access technology (RAT) is emerging. Furthermore, massive Machine Type Communications (MTC), which connects numerous devices and objects to provide various services anytime, anywhere, is also a key issue to be considered in next-generation communication. Furthermore, communication system design that considers reliability and latency-sensitive services / terminals is being discussed. The introduction of next-generation radio access technologies that take into account enhanced mobile broadband communication, massive MTC, and URLLC (Ultra-Reliable and Low Latency Communication) is being discussed. For convenience, these technologies are referred to as new RAT or NR in the present invention.

[0004] The technical challenge is to provide a method for terminals to transmit mobility-related measurement information more accurately and efficiently.

[0005] The technical challenges are not limited to the technical challenges mentioned above, and other technical challenges not mentioned will be clearly understood by those skilled in the art to which the present invention pertains from the description below.

[0006] A method according to one aspect includes the steps of: receiving, by a User Equipment (UE), a reporting configuration including information on at least one candidate cell related to LTM (L1 / L2 Triggered Mobility) and at least one channel measurement resource based on a CSI-RS (channel state information-reference signal) resource; receiving interference resource configuration information related to the reporting configuration; and performing channel measurement or interference measurement for the at least one candidate cell based on at least one of the reporting configuration and the interference resource configuration information, wherein the interference resource configuration information can configure at least one interference measurement resource for each of the at least one candidate cell.

[0007] Alternatively, the interference resource setting information may set one or more candidate cells associated with the at least one candidate cell for each of the at least one candidate cell in relation to the interference measurement.

[0008] Alternatively, interference measurement for a specific candidate cell among the at least one candidate cell may be performed for one or more interference measurement resources set for one or more candidate cells associated with the specific candidate cell among the at least one interference measurement resource.

[0009] Alternatively, the UE may derive an interference value for the particular candidate cell based on a sum of a Received Signal Strength Indicator (RSSI) or a Reference Signal Received Power (RSRP) measured for the one or more interference measurement resources.

[0010] Alternatively, the UE may derive an interference value for the particular candidate cell based on a linear average of the measured Received Signal Strength Indicator (RSSI) or Reference Signal Received Power (RSRP) for the one or more interference measurement resources.

[0011] Alternatively, based on the fact that the report setting includes a report quantity related to interference measurement, the UE may perform interference measurement for each of the at least one candidate cell based on the report setting.

[0012] Alternatively, the above reporting metric may be L1-SINR (layer1-signal to interference plus noise ratio).

[0013] Alternatively, the UE may determine whether to perform interference measurement for the at least one candidate cell in the at least one interference measurement resource based on the report type of the report setting.

[0014] In another aspect, at least one non-transitory computer-readable recording medium comprises instructions that, when executed by at least one processor, perform operations, the operations comprising: receiving a reporting configuration including information about at least one candidate cell associated with LTM (L1 / L2 Triggered Mobility) and at least one channel measurement resource based on a CSI-RS (channel state information-reference signal) resource; receiving interference resource configuration information associated with the reporting configuration; and performing channel measurement or interference measurement for the at least one candidate cell based on at least one of the reporting configuration and the interference resource configuration information, wherein the interference resource configuration information can configure at least one interference measurement resource for each of the at least one candidate cell.

[0015] According to another aspect, a UE (User Equipment) includes an RF (Radio Frequency) transceiver; and a processor connected to the RF transceiver, wherein the processor controls the RF transceiver to receive a reporting configuration including information on at least one candidate cell related to LTM (L1 / L2 Triggered Mobility) and at least one channel measurement resource based on a CSI-RS (channel state information-reference signal) resource, receive interference resource configuration information related to the reporting configuration, and perform channel measurement or interference measurement on the at least one candidate cell based on at least one of the reporting configuration and the interference resource configuration information, and the interference resource configuration information can configure at least one interference measurement resource for each of the at least one candidate cell.

[0016] According to another aspect, a processing device for controlling a UE (User Equipment) comprises: at least one processor; and at least one memory connected to the at least one processor and storing instructions that perform operations when executed by the at least one processor, wherein the operations include receiving a reporting configuration including information on at least one candidate cell related to LTM (L1 / L2 Triggered Mobility) and at least one channel measurement resource based on a CSI-RS (channel state information-reference signal) resource; receiving interference resource configuration information related to the reporting configuration; and performing channel measurement or interference measurement for the at least one candidate cell based on at least one of the reporting configuration and the interference resource configuration information, wherein the interference resource configuration information can configure at least one interference measurement resource for each of the at least one candidate cell.

[0017] In another aspect, a method by a base station includes the steps of transmitting a reporting configuration including information about at least one candidate cell associated with LTM (L1 / L2 Triggered Mobility) and at least one channel measurement resource based on a channel state information-reference signal (CSI-RS) resource; transmitting interference resource configuration information associated with the reporting configuration; and receiving a measurement report for a channel measurement or interference measurement for the at least one candidate cell, wherein the interference resource configuration information can configure at least one interference measurement resource for each of the at least one candidate cell.

[0018] According to another aspect, a base station includes a Radio Frequency (RF) transceiver; and a processor connected to the RF transceiver, wherein the processor controls the RF transceiver to transmit a reporting configuration including information on at least one candidate cell related to LTM (L1 / L2 Triggered Mobility) and at least one channel measurement resource based on a CSI-RS (channel state information-reference signal) resource, transmit interference resource configuration information related to the reporting configuration, and receive a measurement report on channel measurement or interference measurement for the at least one candidate cell, wherein the interference resource configuration information can configure at least one interference measurement resource for each of the at least one candidate cell.

[0019] Various embodiments enable a terminal to accurately and efficiently transmit mobility-related measurement information. Alternatively, according to one example, interference measurement resources related to the LTM procedure can be configured cell-by-cell, thereby providing candidate cell-level interference measurement values ​​appropriate for the mobility characteristics of the LTM procedure.

[0020] The effects that can be obtained in various embodiments are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art to which the present invention pertains from the description below.

[0021] The drawings attached to this specification are intended to provide an understanding of the present invention, illustrate various embodiments of the present invention, and together with the description of the specification serve to explain the principles of the present invention.

[0022] Figure 1 shows the structure of an LTE system.

[0023] Figure 2 shows the structure of the NR system.

[0024] Figure 3 shows the structure of a radio frame of NR.

[0025] Figure 4 shows the slot structure of an NR frame.

[0026] FIG. 5 is a diagram for explaining physical channels that can be used in various embodiments and a signal transmission method using the same.

[0027] Figure 6 illustrates a process in which a terminal transmits ACK / NACK via PUSCH.

[0028] Figure 7 shows an example of a CSI-related procedure.

[0029] Figure 8 illustrates an example of an LTM procedure.

[0030] FIG. 9 and FIG. 10 are diagrams for explaining a method of setting interference measurement resources in relation to LTM.

[0031] FIG. 11 is a diagram illustrating a method for a UE to perform mobility-related measurements.

[0032] Figure 12 is a diagram illustrating a method for a base station to receive a measurement report related to mobility.

[0033] Figure 13 illustrates a communication system applied to the present invention.

[0034] Figure 14 illustrates a wireless device applicable to the present invention.

[0035] Fig. 15 shows another example of a wireless device applied to the present invention.

[0036] A wireless communication system is a multiple access system that supports communication with multiple users by sharing available system resources (e.g., bandwidth, transmission power, etc.). 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), single carrier frequency division multiple access (SC-FDMA), and multi-carrier frequency division multiple access (MC-FDMA).

[0037] Sidelink refers to a communication method that establishes a direct link between user equipment (UE), allowing voice or data to be exchanged directly between terminals without going through a base station (BS). Sidelink is being considered as a solution to address the burden on base stations due to rapidly increasing data traffic.

[0038] V2X (vehicle-to-everything) refers to a communication technology that exchanges information with other vehicles, pedestrians, and infrastructure-based objects through wired / wireless communication. V2X can be divided into four types: V2V (vehicle-to-vehicle), V2I (vehicle-to-infrastructure), V2N (vehicle-to-network), and V2P (vehicle-to-pedestrian). V2X communication can be provided through the PC5 interface and / or Uu interface.

[0039] Meanwhile, as more and more communication devices demand greater communication capacity, the need for improved mobile broadband communication compared to existing radio access technology (RAT) is emerging. Accordingly, communication systems that consider services or terminals sensitive to reliability and latency are being discussed. Next-generation wireless access technologies that consider improved mobile broadband communication, massive MTC, and URLLC (Ultra-Reliable and Low Latency Communication) can be called new radio access technology (RAT) or new radio (NR). NR can also support V2X (vehicle-to-everything) communication.

[0040] The following technologies can be used in various wireless communication 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 wireless technologies such as UTRA (universal terrestrial radio access) or CDMA2000. TDMA can be implemented with wireless 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 wireless technologies such as IEEE (Institute of Electrical and Electronics Engineers) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and E-UTRA (evolved UTRA). IEEE 802.16m is an evolution of IEEE 802.16e, providing backward compatibility with systems based on IEEE 802.16e. UTRA is part of UMTS (universal mobile telecommunications system). 3GPP (3rd generation partnership project) LTE (long term evolution) is a part of E-UMTS (evolved UMTS) that uses E-UTRA (evolved-UMTS terrestrial radio access), employing OFDMA in the downlink and SC-FDMA in the uplink.LTE-A (advanced) is an evolution of 3GPP LTE.

[0041] 5G NR, the successor to LTE-A, is a new clean-slate mobile communications system featuring high performance, low latency, and high availability. 5G NR can utilize all available spectrum resources, from low-frequency bands below 1 GHz, mid-frequency bands between 1 GHz and 10 GHz, and high-frequency (millimeter wave) bands above 24 GHz.

[0042] For clarity, the description will focus on LTE-A or 5G NR, but the technical ideas of the embodiment(s) are not limited thereto.

[0043] Figure 1 illustrates the architecture of an applicable LTE system. This may be referred to as an Evolved-UMTS Terrestrial Radio Access Network (E-UTRAN) or a Long Term Evolution (LTE) / LTE-A system.

[0044] Referring to FIG. 1, the E-UTRAN includes a base station (20; BS) that provides a control plane and a user plane to a terminal (10). The terminal (10) may be fixed or mobile, and may be referred to by other terms such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), a wireless device, etc. The base station (20) refers to a fixed station that communicates with the terminal (10), and may be referred to by other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, etc.

[0045] Base stations (20) can be connected to each other via the X2 interface. The base station (20) is connected to an EPC (Evolved Packet Core, 30) via the S1 interface, more specifically, to an MME (Mobility Management Entity) via the S1-MME, and to an S-GW (Serving Gateway) via the S1-U.

[0046] The EPC (30) consists of an MME, an S-GW, and a P-GW (Packet Data Network-Gateway). The MME holds information about terminal access and capabilities, and this information is primarily used for terminal mobility management. The S-GW is a gateway with the E-UTRAN as its endpoint, and the P-GW is a gateway with the PDN as its endpoint.

[0047] The layers of the radio interface protocol between the terminal and the network can be divided into L1 (Layer 1), L2 (Layer 2), and L3 (Layer 3) based on the three lower layers of the Open System Interconnection (OSI) standard model, which is widely known in communication systems. Among these, the physical layer belonging to Layer 1 provides an information transfer service using a physical channel, and the RRC (Radio Resource Control) layer located in Layer 3 controls radio resources between the terminal and the network. To this end, the RRC layer exchanges RRC messages between the terminal and the base station.

[0048] Figure 2 shows the structure of the NR system.

[0049] Referring to FIG. 2, the NG-RAN may include a gNB and / or an eNB that provides user plane and control plane protocol termination to the UE. FIG. 1 illustrates a case where only a gNB is included. The gNB and eNB are connected to each other via an Xn interface. The gNB and eNB are connected to the 5th generation core network (5G Core Network: 5GC) via the NG interface. More specifically, the gNB is connected to the access and mobility management function (AMF) via the NG-C interface, and the gNB is connected to the user plane function (UPF) via the NG-U interface.

[0050] Figure 3 shows the structure of a radio frame of NR.

[0051] Referring to FIG. 3, radio frames can be used for uplink and downlink transmission in NR. A radio frame has a length of 10 ms and can be defined as two 5 ms half-frames (Half-Frames, HF). A half-frame can include five 1 ms sub-frames (Subframes, SF). A sub-frame can be divided into one or more slots, and the number of slots within a sub-frame can be determined by the Subcarrier Spacing (SCS). Each slot can include 12 or 14 OFDM (A) symbols depending on the cyclic prefix (CP).

[0052] When normal CP is used, each slot can contain 14 symbols. When extended CP is used, each slot can contain 12 symbols. Here, the symbols can include OFDM symbols (or CP-OFDM symbols), SC-FDMA (Single Carrier - FDMA) symbols (or DFT-s-OFDM (Discrete Fourier Transform-spread-OFDM) symbols).

[0053] Table 1 below shows the number of symbols per slot ((N)) depending on the SCS setting (u) when normal CP is used. slot symb ), number of slots per frame ((N frame,u slot ) and the number of slots per subframe ((N subframe,u slot ) is an example.

[0054] 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

[0055] Table 2 illustrates the number of symbols per slot, the number of slots per frame, and the number of slots per subframe according to SCS when extended CP is used.

[0056] SCS (15*2 u )N slot symb N frame,u slot N subframe,u slot 60KHz (u=2)12404

[0057] In an NR system, OFDM(A) numerologies (e.g., SCS, CP length, etc.) can be configured differently across multiple cells that are merged into a single terminal. Accordingly, the (absolute time) interval of a time resource (e.g., subframe, slot, or TTI) (conveniently referred to as a TU (Time Unit)) consisting of the same number of symbols can be configured differently across the merged cells. In NR, multiple numerologies or SCSs can be supported to support various 5G services. For example, when the SCS is 15 kHz, a wide area in traditional cellular bands can be supported, and when the SCS is 30 kHz / 60 kHz, dense-urban, lower latency, and wider carrier bandwidth can be supported. When the SCS is 60 kHz or higher, bandwidths greater than 24.25 GHz may be supported to overcome phase noise.

[0058] The NR frequency band can be defined by two types of frequency ranges. The two types of frequency ranges can be FR1 and FR2. The numerical values ​​of the frequency ranges can be changed, and for example, the two types of frequency ranges can be as shown in Table 3 below. Among the frequency ranges used in the NR system, FR1 can mean the "sub 6 GHz range", and FR2 can mean the "above 6 GHz range" and can be called millimeter wave (mmW).

[0059] Frequency Range designationCorresponding frequency rangeSubcarrier Spacing (SCS)FR1450MHz - 6000MHz15, 30, 60kHzFR224250MHz - 52600MHz60, 120, 240kHz

[0060] As described above, the numerical value of the frequency range of the NR system can be changed. For example, FR1 may include a band from 410 MHz to 7125 MHz, as shown in Table 4 below. That is, FR1 may include a frequency band above 6 GHz (or 5850, 5900, 5925 MHz, etc.). For example, the frequency band above 6 GHz (or 5850, 5900, 5925 MHz, etc.) included within FR1 may include an unlicensed band. The unlicensed band may be used for various purposes, such as for vehicular communications (e.g., autonomous driving).

[0061] Frequency Range designationCorresponding frequency rangeSubcarrier Spacing (SCS)FR1410MHz - 7125MHz15, 30, 60kHzFR224250MHz - 52600MHz60, 120, 240kHz

[0062] Figure 4 shows the slot structure of an NR frame.

[0063] Referring to Figure 4, a slot includes multiple symbols in the time domain. For example, in the case of a normal CP, one slot may include 14 symbols, but in the case of an extended CP, one slot may include 12 symbols. Alternatively, in the case of a normal CP, one slot may include 7 symbols, but in the case of an extended CP, one slot may include 6 symbols.

[0064] A carrier includes multiple subcarriers in the frequency domain. An RB (Resource Block) can be defined as multiple (e.g., 12) consecutive subcarriers in the frequency domain. A BWP (Bandwidth Part) can be defined as multiple consecutive (P)RBs ((Physical) Resource Blocks) in the frequency domain, and can correspond to one numerology (e.g., SCS, CP length, etc.). A carrier can include up to N (e.g., 5) BWPs. Data communication can be performed through activated BWPs. Each element can be referred to as a Resource Element (RE) in the resource grid, and one complex symbol can be mapped to it.

[0065] Meanwhile, the wireless interface between terminals or between terminals and a network may be composed of an L1 layer, an L2 layer, and an L3 layer. In various embodiments of the present disclosure, the L1 layer may refer to a physical layer. Furthermore, for example, the L2 layer may refer to at least one of a MAC layer, an RLC layer, a PDCP layer, and an SDAP layer. Furthermore, for example, the L3 layer may refer to an RRC layer.

[0066] Bandwidth part (BWP)

[0067] The NR system can support up to 400 MHz per component carrier (CC). If a terminal operating in such a wideband CC always operates with the RF on for the entire CC, the terminal battery consumption may increase. Alternatively, when considering multiple use cases (e.g., eMBB, URLLC, MMTC, V2X, etc.) operating within a wideband CC, different numerologies (e.g., sub-carrier spacing) may be supported for each frequency band within the CC. Alternatively, each terminal may have different capabilities for maximum bandwidth. Considering this, the base station can instruct the terminal to operate only in a portion of the bandwidth rather than the entire bandwidth of the wideband CC, and this portion of bandwidth is conveniently defined as a bandwidth part (BWP). A BWP can be composed of consecutive resource blocks (RBs) on the frequency axis and can correspond to a single numerology (e.g., sub-carrier spacing, CP length, slot / mini-slot duration).

[0068] Meanwhile, the base station can set multiple BWPs even within a single CC configured for the UE. For example, in the PDCCH monitoring slot, a BWP occupying a relatively small frequency range can be set, and the PDSCH indicated by the PDCCH can be scheduled on a larger BWP. Alternatively, if UEs are concentrated in a specific BWP, some UEs can be set to a different BWP for load balancing. Alternatively, considering frequency domain inter-cell interference cancellation between neighboring cells, a portion of the spectrum in the middle of the total bandwidth can be excluded, and both BWPs can be set within the same slot. That is, the base station can configure at least one DL / UL BWP for a terminal associated with a wideband CC, and can activate at least one DL / UL BWP among the configured DL / UL BWP(s) at a specific point in time (by L1 signaling or MAC CE or RRC signaling, etc.), and switching to another configured DL / UL BWP can be indicated (by L1 signaling or MAC CE or RRC signaling, etc.), or switching to a predetermined DL / UL BWP when the timer value expires based on a timer. At this time, the activated DL / UL BWP is defined as the active DL / UL BWP. However, the terminal may not receive the configuration for the DL / UL BWP in situations such as when the terminal is in the initial access process or before the RRC connection is set up. In such situations, the DL / UL BWP assumed by the terminal is defined as the initial active DL / UL BWP.

[0069] FIG. 5 is a diagram for explaining physical channels that can be used in various embodiments and a signal transmission method using the same.

[0070] Referring to FIG. 5, a terminal that is powered on again after being powered off or that has newly entered a cell 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). The terminal synchronizes with the base station based on the PSS / SSS and obtains information such as a cell ID. 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.

[0071] A terminal that has completed initial cell search can obtain more specific system information by receiving a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) based on physical downlink control channel information (S12).

[0072] Thereafter, the terminal may perform a random access procedure to complete connection to the base station (S13 to S16). To this end, the terminal may transmit a preamble through a physical random access channel (PRACH) (S13) and receive a random access response (RAR) for the preamble through a physical downlink control channel and a corresponding physical downlink shared channel (S14). The terminal may transmit a physical uplink shared channel (PUSCH) using scheduling information in the RAR (S15) and perform a contention resolution procedure such as receiving a physical downlink control channel signal and a corresponding physical downlink shared channel signal (S16).

[0073] Meanwhile, in addition to the random access process performed in 4 steps as above (4-step RACH, type-1 random access procedure), when the random access process is performed in 2 steps (2-step RACH, type-2 random access procedure), S13 / S15 may be performed as one operation in which the terminal performs transmission (e.g., transmission operation of message A including PRACH preamble and / or PUSCH), and S14 / S16 may be performed as one operation in which the base station performs transmission (e.g., transmission operation of message B including RAR and / or collision resolution information).

[0074] A terminal that has performed the procedure described above can then perform general uplink / downlink signal transmission procedures, such as receiving a physical downlink control channel signal and / or a physical downlink shared channel signal (S17) and transmitting a physical uplink shared channel (PUSCH: Physical Uplink Shared Channel) signal and / or a physical uplink control channel (PUCCH: Physical Uplink Control Channel) signal (S18).

[0075] Control information transmitted from a terminal to a base station is collectively referred to as uplink control information (UCI). UCI includes information such as HARQ-ACK / NACK (Hybrid Automatic Repeat and reQuest Acknowledgement / Negative-ACK), SR (Scheduling Request), CQI (Channel Quality Indication), PMI (Precoding Matrix Indication), and RI (Rank Indication).

[0076] UCI is typically transmitted periodically over the PUCCH, but can also be transmitted over the PUSCH when control information and data must be transmitted simultaneously. Furthermore, terminals can transmit UCI aperiodically over the PUSCH at the request / instruction of the network.

[0077] Figure 6 illustrates a process in which a terminal transmits ACK / NACK via PUSCH.

[0078] Referring to FIG. 6, the terminal can detect a PDCCH in slot #n. Here, the PDCCH includes downlink scheduling information (e.g., DCI formats 1_0, 1_1), and the PDCCH indicates a DL assignment-to-PDSCH offset (K0) and a PDSCH-HARQ-ACK reporting offset (K1). For example, DCI formats 1_0, 1_1 can include the following information:

[0079] - Frequency domain resource assignment: Indicates the set of RBs allocated to the PDSCH.

[0080] - Time domain resource assignment: K0 (e.g., slot offset), indicates the starting position of the PDSCH within slot #n+K0 (e.g., OFDM symbol index), and the length of the PDSCH (e.g., number of OFDM symbols).

[0081] - PDSCH-to-HARQ_feedback timing indicator: Indicates K1

[0082] - HARQ process number (4 bits): Indicates the HARQ process ID (Identity) for data (e.g., PDSCH, TB)

[0083] - PUCCH resource indicator (PRI): Indicates the PUCCH resource to be used for UCI transmission among multiple PUCCH resources within the PUCCH resource set.

[0084] Afterwards, the terminal receives PDSCH from slot #(n+K0) according to the scheduling information of slot #n, and when reception of PDSCH is finished in slot #n1 (where, n+K0≤n1), UCI can be transmitted through PUCCH in slot #(n1+K1). Here, UCI may include HARQ-ACK response for PDSCH. In Fig. 6, for convenience, it is assumed that SCS for PDSCH and SCS for PUCCH are the same and slot # n1 = slot #n+K0, but the present invention is not limited thereto. If the SCSs are different, K1 can be indicated / interpreted based on the SCS of PUCCH.

[0085] When the PDSCH is configured to transmit at most 1 TB, the HARQ-ACK response may consist of 1 bit. When the PDSCH is configured to transmit at most 2 TB, the HARQ-ACK response may consist of 2 bits if spatial bundling is not configured, and may consist of 1 bit if spatial bundling is configured. When the HARQ-ACK transmission timing for multiple PDSCHs is designated as slot #(n+K1), the UCI transmitted in slot #(n+K1) includes HARQ-ACK responses for multiple PDSCHs.

[0086] Whether a UE should perform spatial bundling for a HARQ-ACK response can be configured (e.g., via RRC / higher layer signaling) for each cell group. For example, spatial bundling can be individually configured for each HARQ-ACK response transmitted over the PUCCH and / or each HARQ-ACK response transmitted over the PUSCH.

[0087] Spatial bundling can be supported when the maximum number of TBs (or codewords) that can be received at a time (or scheduled via 1 DCI) in the serving cell is 2 (or more than 2) (e.g., when the upper layer parameter maxNrofCodeWordsScheduledByDCI corresponds to 2-TB). Meanwhile, more than 4 layers can be used for 2-TB transmission, and up to 4 layers can be used for 1-TB transmission. Consequently, when spatial bundling is configured for the cell group, spatial bundling can be performed for serving cells that can schedule more than 4 layers among the serving cells in the cell group. On the serving cell, a UE that wishes to transmit a HARQ-ACK response via spatial bundling can generate the HARQ-ACK response by performing a (bit-wise) logical AND operation on the A / N bits for multiple TBs.

[0088] For example, assuming that a terminal receives a DCI scheduling 2 TB and receives 2 TB via PDSCH based on the DCI, the terminal performing spatial bundling can generate a single A / N bit by logically ANDing the first A / N bit for the first TB and the second A / N bit for the second TB. Consequently, if both the first TB and the second TB are ACK, the terminal reports the ACK bit value to the base station, and if either TB is NACK, the terminal reports the NACK bit value to the base station.

[0089] For example, if only 1-TB is actually scheduled on a serving cell configured to receive 2-TB, the terminal can generate a single A / N bit by logically ANDing the A / N bit for the 1-TB with bit value 1. Consequently, the terminal reports the A / N bit for the 1-TB to the base station as is.

[0090] A base station / terminal has multiple parallel DL HARQ processes for DL ​​transmission. These multiple parallel HARQ processes allow DL transmissions to be performed continuously while waiting for HARQ feedback regarding the successful or unsuccessful reception of a previous DL transmission. Each HARQ process is associated with a HARQ buffer in the MAC (Medium Access Control) layer. Each DL HARQ process manages state variables such as the number of transmissions of MAC Physical Data Blocks (PDUs) in the buffer, HARQ feedback for MAC PDUs in the buffer, and the current redundancy version. Each HARQ process is identified by a HARQ process ID.

[0091] Below, the PUSCH transmission process is described.

[0092] The terminal can detect the PDCCH in slot #n. Here, the PDCCH includes uplink scheduling information (e.g., DCI formats 0_0 and 0_1). DCI formats 0_0 and 0_1 can include the following information.

[0093] - Frequency domain resource assignment: Indicates the set of RBs allocated to PUSCH.

[0094] - Time domain resource assignment: Slot offset K2 indicates the starting position (e.g., symbol index) and length (e.g., number of OFDM symbols) of the PUSCH within the slot. The starting symbol and length can be indicated through SLIV (Start and Length Indicator Value) or can be indicated separately.

[0095] Thereafter, the terminal can transmit a PUSCH in slot #(n+K2) according to the scheduling information of slot #n. Here, the PUSCH includes a UL-SCH TB.

[0096] CSI-related actions

[0097] Figure 7 shows an example of a CSI-related procedure.

[0098] 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.

[0099] - 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.

[0100] - 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.

[0101] - 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.

[0102] - 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.

[0103] - 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.

[0104] 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).

[0105] 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.

[0106] The time domain operation of CSI reporting supports periodic, semi-persistent, and aperiodic operations. 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) Semi-periodic (SP) 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 set to RRC, but the slot offset is not set to RRC, and SP CSI reporting is activated / deactivated by DCI (format 0_1). A separate RNTI (SP-CSI C-RNTI) is used for SP CSI reporting on PUSCH. The timing of the first CSI report follows the PUSCH time domain allocation value indicated in the DCI, and the timing of subsequent CSI reports follows the period 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 that of data transmission on SPS PUSCH.iii) Aperiodic CSI reporting is performed on PUSCH and is triggered by DCI. In this case, information related to the trigger 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.

[0107] CSI codebooks defined in the NR standard (e.g., PMI codebooks) can be broadly divided into Type I and Type II codebooks. Type I codebooks are primarily targeted at SU (Single User)-MIMO, which supports both high-order and low-order signals. Type II codebooks can primarily support MI-MIMO, which supports up to two layers. Compared to Type I, Type II codebooks can provide more accurate CSI, but may increase signaling overhead. Meanwhile, Enhanced Type II codebooks were introduced to address the CSI overhead shortcomings of existing Type II codebooks. Enhanced Type II codebooks were introduced by reducing the codebook payload by considering frequency-axis correlation.

[0108] CSI reporting via PUSCH can be configured as Part 1 and Part 2. Part 1 has a fixed payload size and is used to identify the number of information bits in Part 2. Part 1 is transmitted in its entirety before Part 2.

[0109] - For Type I CSI feedback, Part 1 contains the RI (if reported), the CRI (if reported), and the CQI of the first code word. Part 2 contains the PMI, and when RI > 4, Part 2 contains the CQI.

[0110] - For Type II CSI feedback, Part 1 contains the RI (if reported), CQI, and an indication of the number of non-zero WB amplitude coefficients per layer of Type II CSI. Part 2 contains the PMI of Type II CSI.

[0111] - For Enhanced Type II CSI feedback, Part 1 contains the RI (if reported), CQI, and the total number of non-zero WB amplitude coefficients for all layers of Enhanced Type II CSI. Part 2 contains the PMI of Enhanced Type II CSI.

[0112] If a CSI report on PUSCH includes two parts and the CSI payload to be reported is less than the payload size provided by the PUSCH resources allocated for CSI reporting, the UE may omit part of Part 2 CSI.

[0113] Meanwhile, semi-persistent CSI reporting performed in PUCCH format 3 or 4 supports Type II CSI feedback, but only Part 1 of Type II CSI feedback.

[0114] For CSI reporting, the time and frequency resources available to the UE are controlled by the base station.

[0115] CSI (channel state information) may include at least one of a channel quality indicator (CQI), a precoding matrix indicator (PMI), a CSI-RS resource indicator (CRI), an SS / PBCH block resource indicator (SSBRI), a layer indicator (LI), a rank indicator (RI), L1-RSRP, and / or L-SINR.

[0116] For CQI, PMI, CRI, SSBRI, LI, RI, and L1-RSRP, the UE is configured by a higher layer with N≥1 CSI-ReportConfig reporting settings, M≥1 CSI-ResourceConfig resource settings, and a list of one or two trigger states (provided by CSI-AperiodicTriggerStateList and CSI-SemiPersistentOnPUSCH-TriggerStateList). Each trigger state in the CSI-AperiodicTriggerStateList includes an associated list of CSI-ReportConfigs indicating resource set IDs for channel and optionally interference. Each trigger state in the CSI-SemiPersistentOnPUSCH-TriggerStateList includes one associated CSI-ReportConfig.

[0117] Additionally, the time domain behavior of CSI reporting supports periodic, semi-persistent, and aperiodic.

[0118] i) Periodic CSI reporting is performed on short PUCCH and long PUCCH. The periodicity and slot offset of periodic CSI reporting can be configured via RRC, and refer to the CSI-ReportConfig IE.

[0119] ii) SP (semi-periodic) CSI reporting is performed on short PUCCH, long PUCCH, or PUSCH.

[0120] In case of SP CSI on short / long PUCCH, the period and slot offset are set by RRC, and CSI reporting is activated / deactivated with a separate MAC CE / DCI.

[0121] In the case of SP CSI on PUSCH, the periodicity of SP CSI reporting is set to RRC, but the slot offset is not set to RRC, and SP CSI reporting is activated / deactivated by DCI (format 0_1). For SP CSI reporting on PUSCH, a separate RNTI (SP-CSI C-RNTI) is used.

[0122] The initial CSI reporting timing follows the PUSCH time domain allocation value indicated in the DCI, and subsequent CSI reporting timing follows the cycle set by RRC.

[0123] DCI format 0_1 ​​contains 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 data transmission on the SPS PUSCH.

[0124] 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.

[0125] For AP CSI with AP CSI-RS, AP CSI-RS timing is set by RRC, and timing for AP CSI reporting is dynamically controlled by DCI.

[0126] NR does not apply the method of dividing CSI into multiple reporting instances (e.g., transmitting in the order of RI, WB PMI / CQI, and SB PMI / CQI) used for PUCCH-based CSI reporting in LTE. Instead, NR restricts specific CSI reporting on short / long PUCCHs and defines CSI omission rules. Furthermore, with respect to AP CSI reporting timing, PUSCH symbol / slot locations are dynamically indicated by DCI. Candidate slot offsets are configured by RRC. For CSI reporting, the slot offset (Y) is configured for each reporting setting. For UL-SCH, the slot offset K2 is configured separately.

[0127] Two CSI latency classes (low latency class, high latency class) are defined from the perspective of CSI computation complexity. Low latency CSI is WB CSI including up to 4 ports Type-I codebook or up to 4-port non-PMI feedback CSI. High latency CSI refers to any CSI other than low latency CSI. For a normal terminal, (Z, Z') is defined in units of OFDM symbols. Here, Z represents the minimum CSI processing time from receiving an aperiodic CSI triggering DCI to performing a CSI report. In addition, Z' represents the minimum CSI processing time from receiving a CSI-RS for channel / interference to performing a CSI report.

[0128] Additionally, the terminal reports the number of CSIs it can calculate simultaneously.

[0129] QCL (quasi-co location)

[0130] Two antenna ports are quasi-co-located if the channel properties of one antenna port can be inferred from the channel properties of the other antenna port. The channel properties may include one or more of Delay spread, Doppler spread, Frequency / Doppler shift, Average received power, Received Timing / average delay, and Spatial RX parameters.

[0131] A terminal can configure a list of multiple TCI-State configurations via the upper layer parameter PDSCH-Config. Each TCI-State is associated with one or two DL reference signals and a QCL configuration parameter between the DM-RS port of the PDSCH. The QCL can include qcl-Type1 for the first DL RS and qcl-Type2 for the second DL RS. The QCL type can correspond to one of the following:

[0132] - 'QCL-TypeA': {Doppler shift, Doppler spread, average delay, delay spread}

[0133] - 'QCL-TypeB': {Doppler shift, Doppler spread}

[0134] - 'QCL-TypeC': {Doppler shift, average delay}

[0135] - 'QCL-TypeD': {Spatial Rx parameter}

[0136] Beam Management (BM)

[0137] The BM process is a process for acquiring and maintaining a set of BS (or transmission and reception point (TRP)) and / or UE beams that can be used for downlink (DL) and uplink (UL) transmission / reception, and may include the following processes and terms.

[0138] - Beam measurement: An operation in which a BS or UE measures the characteristics of a received beamforming signal.

[0139] - Beam determination: An operation in which a BS or UE selects its own transmit beam (Tx beam) / receive beam (Rx beam).

[0140] - Beam sweeping: An operation of covering a spatial domain using transmit and / or receive beams over a predetermined time interval in a predetermined manner.

[0141] - Beam report: An operation in which a UE reports information about a beamformed signal based on beam measurement.

[0142] The BM process can be divided into (1) a DL BM process using SSB or CSI-RS, and (2) a UL BM process using SRS (sounding reference signal). In addition, each BM process can include Tx beam sweeping to determine a Tx beam and Rx beam sweeping to determine an Rx beam.

[0143] At this time, the DL BM process may include (1) transmission of beamformed DL RSs (e.g., CSI-RS or SSB) by the BS and (2) beam reporting by the UE.

[0144] Here, the beam report may include preferred DL RS ID(s) and corresponding reference signal received power (RSRP). The DL RS ID may be an SSB Resource Indicator (SSBRI) or a CSI-RS Resource Indicator (CRI).

[0145] Figure 8 illustrates an example of an LTM procedure.

[0146] Referring to FIG. 8, 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).

[0147] The base station transmits an RRCReconfiguration message including an LTM candidate configuration to the terminal (502).

[0148] The terminal stores the LTM candidate configuration and transmits an RRCReconfigurationComplete message to the base station (503).

[0149] 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).

[0150] 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.

[0151] 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 (502) is valid.

[0152] 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.

[0153] 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).

[0154] 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.

[0155] Steps 504 to 508 can be performed iteratively by utilizing the LTM candidate configuration provided in step 502.

[0156] The procedure on the wireless interface illustrated in Fig. 8 can be applied to both intra-BS-DU LTM and inter-BS-DU LTM.

[0157] 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.

[0158] 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:

[0159] 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.

[0160] 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.

[0161] 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.

[0162] 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

[0163] ltm-ReportContent-r18 defines what will be included in a single L1 measurement report instance and can include the following parameters:

[0164] - nrOfReportedCells-r18: Number of cells reported (e.g. 1 to 4)

[0165] - nrOfReportedRS-PerCell-r18: Number of RS reported per cell (e.g. 1 to 4)

[0166] - spCellInclusion-r18: Defines whether to include the current serving cell (SpCell) in the report. Configurable only when SpCell is set as an LTM candidate.

[0167] Meanwhile, with regard to the above-described LTM procedure, reinforcement measures such as those in Tables 5 and 6 below are being discussed.

[0168] Enhancements for L1 Inter-Cell Beam Management (ICBM) (1) L1 Measurements for ICBM1) Measurement Resources- L1 intra- / inter-frequency measurements- CD-SSB-- SSB periodicity, position of SSB within burst are provided as time domain information for both intra-cell and inter-cell frequencies-- In terms of configuration, PCI is associated with SSB within LTM-CSI-SSB-ResourceSet: ① For serving cell, it is provided within ServingCellConfig ② For candidate cell, it is provided within CellGroupConfig, separate from ServingCellConfig of serving cell2) Beam Direction- Beam direction for candidate cell in Rel-18 LTM is designed based on Rel-17 Unified TCI Framework-- For more than one candidate cell, TCI state activation via MAC CE is allowed before cell switching command.- For TCI state configuration:-- Within QCL-Info of each TCI state, maximum 2 QCL types and each QCL type source RS is based on RS configuration for LTM Provided: ① In Rel-18 LTM, provided as a QCL source in TCI state before / during cell switch command ② For candidate cells, SSB or TRS can be configured in TCI state before / during cell switch command.(2) L1 Measurement Report1) Report as UCI - Periodic PUCCH, Semi-persistent PUCCH / PUSCH, Aperiodic PUSCH2) Report quantity: L1-RSRP3) Within one reporting instance, reports on serving cell and candidate cells (including intra-cell frequencies and / or inter-cell frequencies) can be included - Among the configured L cells, M beams can be selected for each cell (the maximum M / L is determined by the UE performance) (e.g., M×L beams are reported within one reporting instance) - SSBRI between the configured candidate cells is included in each L1-RSRP report - The bit size of SSBRI is log2(K_SSB), where K_SSB is the number of SSBs configured in the resource set for the corresponding report4) With CSI report - LTM CSI report processing occupies 1 CPU - According to the priority rule of CSI report, LTM CSI report has priority over the existing CSI report. (3) Cell switch command (CSC) via MAC-CE1) Information items that may be included in the CSC (at a minimum): - Information to identify the target cell - Timing Advance (TA) related information - Active DL / UL BWP for the target cell - One unified or UL / DL unified TCI state index pair for the target cell - Beam indication for the target cell and TCI state activation for the candidate cell are performed via Rel-17 TCI state index indication - After the RACH procedure, the UE follows the TCI state indicated in the cell switch command until a new TCI state is indicated by the target cell (at least for CFRA triggered by the cell switch command) - Beam application timing is supported, which starts after the last symbol of the PUCCH or PUSCH carrying the HARQ-ACK for the PDSCH containing the MAC-CE.

[0169] Timing Advance (TA) Management for Delay Reduction (1) Mechanism for TA Acquisition of Candidate Cell (PDCCH-based RACH) 1) PDCCH ordered RACH (CBRA, CFRA) - PDCCH order from source cell contains information indicating candidate cell. -- Reserved bits in DCI format 1_0 for PDCCH command can be used to indicate cell identity. -- The size of N bits in DCI format 1_0 for cell indication is determined by the number of candidate cells (C) for which RACH configuration for early TA acquisition is provided: ① N = ceil (log₂(C + 1)) ② The number of cells for bit calculation is the number of candidate cells for which RACH configuration for early TA acquisition is provided + 1 (including the serving cell) - PDCCH command is triggered only by the source cell2) RACH-less mechanism - UE-based TA measurement (UE derives TA based on the reception timing difference between the current serving cell and candidate cells and the TA value of the serving cell) is supported.-- UE capability to support UE-based TA measurement is introduced-- UE-based TA measurement configuration is supported if the UE reports support for the corresponding capability (2) RACH for TA acquisition1) Configuration - RACH resources for candidate cells Configuration is provided prior to the PDCCH command - For Rel-18 LTM, RACH occasion information is configured along with the SSB index associated with the random access preamble index for each candidate cell. 2) Transmit power - The SSB of the candidate cell indicated by the PDCCH command is used as the path loss reference RS for PRACH transmit power estimation - If RAR is not configured: -- Explicitly indicates whether the PRACH is an initial transmission or a retransmission via a 1-bit field in the PDCCH command -- Whether power ramping is performed is determined by the PDCCH command: If power ramping is performed, a power increase value is configured.Otherwise, power is determined by open loop power control. - For CFRA, - UE maintains only one power ramping counter. - Upon receiving a PDCCH command indicating initial transmission of PRACH, the power ramping counter is reset. - Upon receiving a PDCCH command indicating retransmission of PRACH for the same candidate cell and the same SSB, the counter is incremented by 1. - The power ramping counter is reset when: The candidate cell in the PDCCH command indicating retransmission is different from the one in the previous PDCCH command.3) RAR - Whether RAR is received is configured by RRC. - If RAR reception is configured: - If RAR is received from the serving cell (including both intra- / inter-DU situations) - If RAR includes at least TAs of candidate cells: ① UE stores (remembers / maintains / processes) TAs for at least one candidate cell. ② The maximum number of TAs that the UE can store is determined by UE capabilities. - If RAR reception is not configured, regardless of the PreambleTransMax setting, the UE PRACH autonomous retransmission.4) Simultaneous / parallel transmission- In case of PDCCH command-based PRACH transmission for a candidate cell, if the UE capability does not support simultaneous / parallel transmission, if the PRACH transmission (or the delay time for preparing the transmission, carrier / BWP switching time, UL / DL RF tuning time, etc.) overlaps with a subsequent UL transmission for the serving cell by one or more symbols, or if the time interval between the two transmissions is shorter than a certain threshold (N symbols), the UL transmission for the serving cell is aborted-- PRACH transmission-- PUCCH / PUSCH transmission including HARQ-ACK, SR, P / SP CSI, aperiodic CSI-- SRS transmission-- Any other PUCCH / PUSCH transmission- If the UE supports simultaneous / parallel transmission:-- PRACH transmission for the LTM candidate cell has the highest priority in terms of power allocation.(3) TA update for candidate cells can be triggered by the network 1) RACH execution within candidate cells based on PDCCH command (reuse of initial TA acquisition method).

[0170] Existing RRM (Radio Resource Management) reporting supports periodic reporting and event triggered reporting based on cell quality, but it was agreed to support Layer 1 (L1) signaling for LTM (L1 / L2 triggered mobility, or Layer Two Mobility).

[0171] Mobility enhancement up to Rel-18 was performed based on SSB. For example, beam reporting for the target cell to which the UE will hand over is supported, and the beam reporting can be performed using Layer 1 signaling. In this regard, in Rel-19, operations related to mobility enhancement, such as the LTM procedure, have been extended to be based on CSI-RS. Compared to SSB, CSI-RS has a narrow beam width, a wide bandwidth (BW), and can have a larger number of corresponding resources. Against this backdrop, although resource-based measurements of CSI-RS can result in relatively accurate RSRP measurements due to the narrow beam width and wide BW, their reliability may deteriorate if they are directly mapped to cell quality and used for handover decisions. Therefore, it is appropriate to use L1-SINR as the reporting indicator to improve reliability. For example, in order to improve the reliability of the measurement based on the CSI-RS, the reporting index of the CSI-RS related to the LTM procedure can be set / defined as L1-SINR. For this purpose, resource configuration for interference measurement may be required. For example, resources for interference measurement need to be configured considering the time-varying property of interference and the property that the measurement is for a candidate cell other than the serving cell (e.g., a cell to which the UE is expected to perform a handover using the LTM procedure in the future). Hereinafter, a method for configuring resources for interference measurement in relation to CSI-RS measurement related to the LTM procedure will be described in detail.

[0172] IMR configuration and related UE behavior for mobility case

[0173] In the existing RRM (Radio Resource Management) measurement, when reporting SINR (Signal-to-Interference-plus-Noise Ratio), resources for interference measurement are not set up separately, and interference measurement is set to be performed in the RE where the reference signal (SSB or CSI-RS) is transmitted (see TS 38.215 CSI-SINR, SS-SINR). Currently, the configuration of a resource set (e.g., channel measurement resource; CMR) for SSB-based LTM reporting is in the form of individually assigning / setting a cell ID for each resource (e.g., each of multiple resources included in the resource set). Therefore, SSBs for multiple cells can be set up in a single resource set. In the existing L1 CSI reporting, the configuration of IMR (interference measurement resource) resources can individually set resources corresponding to each CMR.

[0174] Therefore, there are two main ways to set up CMR in the reporting settings that can be considered in Rel-19.

[0175] In the first method, similar to the existing SSB-based LTM reporting, CMR for CSI-RS resources can be configured with resources for multiple cells within a resource set (e.g., multiple resources of multiple cells can be mixed within a CMR or resource set). In the case of the first method, multiple candidate cells can be detected depending on the UE location. For example, measurements for multiple candidate cells can be obtained within the resource set of one CMR configuration. In this case, there is an advantage that the gNB can determine the best cell and best beam of the UE at once through the trigger of one (single) reporting configuration (or CMR configuration). For example, CMR for CSI-RS resources can be advantageous in that multiple resources for multiple cells can be included within one resource set, and measurements for multiple cells can be performed with one resource set or reporting configuration thereof. However, since the first method operates a site-specific resource set, the configured resource set may become invalid due to changes in time and environment, and it may be difficult to distinguish the reporting configuration unit through intra-frequency / inter-frequency measurements. Furthermore, in order to achieve the above-described advantages, it may be important to appropriately configure / include the resources of the necessary candidate cells within the resource set. For example, if the resource set includes all resources for possible (all) candidate cells, the number of activated NZP (non-zero power) CSI-RS resources may unnecessarily increase when measurement / reporting for the reporting configuration related to the resource set is triggered. Conversely, if too few resources are configured / included in the resource set, the gNB may need to trigger multiple reporting configurations to obtain the desired information.In this case, signaling overhead may increase significantly. To address these issues, a method of indicating activation / deactivation of some / all resources within a resource set using MAC-CE (such as TCI state activation / deactivation) may be considered. For example, the resource set may include all resources for possible candidate cells, but the gNB may indicate activation / deactivation of some of the resources within the resource set using MAC-CE, thereby preventing too many NZP CSI-RS resources from being activated.

[0176] The second method may be a case where only resources of a single cell ID are included in the resource set of the CMR belonging to the reporting configuration for LTM, similar to the CSI reporting of the existing serving cell MIMO. That is, it may be a method of configuring a CMR with only CSI-RS resources of a single candidate cell. This second method may be appropriate when measuring CSI-RS is not for judging cell quality, but for determining beam information to be indicated along with handover (for example, when the gNB determines cell quality based on SSB, but determines beam to be indicated along with handover based on CSI-RS). For example, the second method can prevent beam quality information of a specific cell required by the gNB from being omitted due to resources of cells with poor cell quality but only good beam quality. In addition, the second method may be easy to distinguish reporting units by intra- / inter-frequency measurement. However, if a candidate cell for a potential handover is incorrectly selected / determined, there may be a disadvantage in that the CMR setting for the incorrectly selected candidate cell is unnecessarily signaled.

[0177] FIG. 9 and FIG. 10 are diagrams for explaining a method of setting interference measurement resources in relation to LTM.

[0178] Hereinafter, a method for setting up a resource or a set of resources for interference measurement (e.g., an interference measurement resource or a set of interference measurement resources for the LTM procedure) when measurements are reported via L1 signaling for an LTM procedure (e.g., when beam reporting for a candidate cell is performed based on a CSI reporting framework) is described in detail. The method for setting up an interference measurement resource or a set of interference measurement resources for the LTM procedure described below (or a method for setting up a CMR for interference measurement) may consider both the first and second methods described above. And / or, the resource setting up for interference measurement may assume / presuppose both CSI-IM (Interference Measurement) and NZP CSI-RS, which were used for interference measurement resources in the existing CSI reporting framework. For example, when CSI-IM is used as an interference measurement resource, the UE may measure the received power (RSSI) in the time / frequency resources set as the interference measurement resource, and calculate the measured RSSI as an interference term. And / or, when NZP CSI-RS is used as an interference measurement resource, the UE can measure the strength of the received signal (e.g., RSRP) of the resource set as the interference measurement resource, and calculate the measured received signal strength as an interference term. In addition, the resource or resource set (e.g., interference measurement resource or interference measurement resource set for LTM procedure) set by the method proposed below can be applied to both the case where the UE is instructed to report based on a specific reporting index that takes interference into account from the gNB when the reporting index is SINR. Meanwhile, when handing over to a candidate cell through the LTM procedure (e.g., when handover to a candidate cell is performed based on the LTM procedure), reporting CQI may be reporting on IMR.

[0179] 1. Method for UE to determine interference measurement resources from LTM's CSI report.

[0180] Based on the above, the UE may be instructed to report beam quality (beam quality) of a candidate cell for mobility (and / or LTM) to UCI by at least one of the methods described below, and may be configured with interference measurement resources (or a set of interference measurement resources) in resource configuration.

[0181] (1) Option 1-1

[0182] In Option 1-1, the UE may derive SINR by deriving interference from the resources configured for channel measurement when a separate measurement resource for interference measurement is not configured through the CSI resource / reporting configuration for LTM configured by the gNB, but L1-SINR is indicated / configured as a reporting indicator. For example, the CSI resource / reporting configuration for LTM may not configure a separate interference measurement resource / set of interference measurement resources, but may configure L1-SINR as a reporting indicator. In this case, the UE may derive / induce interference / SINR related to LTM using the measurement resources for channel measurement, and transmit a measurement report including the derived / induced interference / SINR to the gNB.

[0183] The quality of the target / candidate cell to be handed over may need to take into account scheduling of the candidate cell (intra-cell interference) and / or coordination between the candidate cell and the serving cell (or between candidate cells) (inter-cell interference). Therefore, the method according to Option 1-1 may be a more appropriate method to enable reporting of the beam-level SINR that the UE will experience in the event of an actual handover to the candidate cell. For example, the UE may only have CMR configured in the reporting configuration received from the gNB, and SINR may be indicated as the reporting metric. In this case, the UE may derive interference through the difference between the measured RSSI and RSRP in the measurement resource configured in the CMR, and report SINR based on the derived interference.

[0184] The gNB that receives the UE's report information may perform additional filtering, and may process the report information as needed. In this case, the method according to option 1-1 can eliminate ambiguity in UE operation between channel measurement (e.g., when the report metric depends only on channel measurement) and interference measurement (e.g., when the report metric depends only on interference measurement or requires interference measurement). In this case, since the UE derives both channel measurement and interference measurement for the same measurement resource configured, the L1 filter applied to each of the channel measurement and interference measurement may be considered as follows. For example, the UE may apply an L1 filter / filtering according to the UE implementation to each of the channel measurement and interference measurement, and in this case, the two L1 filters may always perform the same filtering for the same time interval. This is because the ambiguity in filtering can be eliminated in that the channel measurement and the interference measurement are combined to perform the reporting of the SINR.

[0185] Alternatively, in order to improve the reliability of measurements due to the time-varying nature of interference, a different L1 filter may be enforced for interference measurements than for channel measurements. For example, parameters of the L1 filter (e.g., the number of measured samples and / or coefficients for performing filtering, etc.) may be introduced / defined only for interference measurements, or filtering may not always be performed for interference measurements (e.g., interference measurements may always be performed based on one-shot measurements because the UE determines that a time constraint has been set for the measurement). Such a method may be efficient in achieving / securing the accuracy of interference measurements required by the network / gNB.

[0186] (2) Option 1-2

[0187] In options 1-2, the UE may optionally configure IMR settings for interference measurements for the CSI resource / reporting configuration for LTM configured by the gNB. In this case, the resources configured as the configured IMR / IMR may include / configure one or more measurement / interference resources for each candidate cell.

[0188] In the existing IMR configuration for beam management, IMR resources corresponding to CMR measurement resources are set. However, since the purpose of LTM measurement / reporting is to determine the target cell for handover, it may be more appropriate to set interference measurement resources on a cell-by-cell basis rather than beam-level interference measurement resources in the IMR configuration for LTM measurement / reporting. Furthermore, considering the HetNet scenario, such cell-specific IMR configuration may be necessary.

[0189] Referring to FIG. 9, in a HetNet (e.g., Heterogeneous Network) scenario, the serving cell to which the UE belongs may be a small cell overlaid with candidate cell 1. At this time, candidate cells 1 and 2 of LTM may be set for the UE, and cell-specific interference measurements may be required depending on the area where the UE moves and a handover is or is expected to be performed. For example, when the UE moves to the serving area of ​​candidate cell #2, all signals / channels of candidate cell #1 and the serving cell may be measured as interference, and the quality of the cell needs to be determined based on the measured interference. For example, when the UE moves to the serving area of ​​candidate cell #2, the serving cell needs to measure interference caused by all signals / channels of candidate cell #1 and the serving cell in order to determine the quality of candidate cell #2.

[0190] For such interference measurement to work, a cell-specific set of interference resources (or IMRs, interference measurement resources) must be established. For example, the UE can perform CSI reporting for LTM based on interference measurements and derive interference values ​​through computations on measurement values ​​for multiple measurement resources of a specific candidate cell. The UE can then use the derived interference values ​​as interference measurements and report them. The following proposed methods may be considered for such interference measurements.

[0191] Specifically, when the UE receives a reporting configuration for CSI reporting for LTM (hereinafter, LTM CSI reporting) from the gNB, the UE may configure IMRs (e.g., a pair of candidate cells and IMRs) for each cell through a separate configuration. For example, the UE may configure one IMR per candidate cell (or candidate cell for LTM) through signaling such as RRC / MAC-CE / DCI from the gNB. Here, as illustrated in FIG. 10 (a), each IMR may be configured with one or more (measurement) resources for the corresponding candidate cell. And / or, the IMR may be configured among the channel measurement resources (e.g., CMRs).

[0192] In addition, as illustrated in FIG. 10 (b), when the UE derives SINR, the UE may set / map at least one IMR candidate cell ID (e.g., IMR candidate cell x0, x1, x2, y0, z0, z1, etc.) corresponding to the CMR candidate cell ID (e.g., CMR candidate cell #0 to CMR candidate cell #10) used for channel measurement. At this time, the UE may determine / specify the CMR candidate cell ID corresponding to each channel measurement resource when the reporting indicator indicates a value requiring interference measurement (e.g., L1-SINR), and perform interference measurement through a measurement operation on the IMRs mapped / paired for at least one IMR candidate cell ID corresponding to the CMR candidate cell ID. For example, at least one IMR candidate cell may be set for each CMR candidate cell, and at least one IMR may be set for each IMR candidate cell ID. In this case, when the UE performs measurement based on the reporting configuration for a specific CMR candidate cell in which the reporting indicator is set to L1-SINR, the UE can derive an interference value through a measurement operation for IMRs set for at least one IMR candidate cell corresponding to the specific CMR candidate cell, and perform a report on interference measurement based on the derived interference value.

[0193] At this time, if there are multiple resources set as IMR or multiple IMR candidate cells mapped / set to CMR candidate cells, the UE can derive interference values ​​for reporting L1-SINR, etc. from the multiple resources set as IMR. For example, if there are multiple resources set as IMR or multiple IMR candidate cells mapped / set to CMR candidate cells, the number of resources set as IMR for performing interference measurements may be multiple. In this case, the UE can derive interference values ​​from the multiple resources set as IMR. The method for deriving interference from the multiple resources may be as follows.

[0194] For example, the UE can derive an interference value based on the sum of RSSI or RSRP values ​​measured across multiple resources configured as IMRs. This approach may be appropriate in overlaid cells or HetNet scenarios, as illustrated in Fig. 10 (a). For example, in the presence of overlaid cells or in the HetNet scenario, inter-gNB transmission coordination may not be performed or may be difficult to perform (e.g., when candidate cells are inter-CU). Even in this case, it may be useful to know the SINR actually received when the UE performs a handover to the candidate cell. For example, as illustrated in FIG. 10 (a), in a case where transmission coordination between gNBs / cells is difficult in a HetNet scenario, the reception strength of signals transmitted by adjacent / neighboring candidate cells (e.g., IMR candidate cells mapped to the target candidate cell) to a target candidate cell (e.g., a CMR candidate cell) to perform handover may correspond to the magnitude of interference (SINR) to the target candidate cell.

[0195] And / or, the UE can derive the interference value through a linear average (e.g., a weighted average) of the RSSI or RSRP values ​​measured from multiple resources configured as IMRs. This method can be useful for increasing the reliability of interference measurements by mimicking the function of L3 filtering through linear averaging, especially when the measurement resource is CSI-IM.

[0196] The above-described interference value derivation methods (e.g., interference value derivation methods using the sum or linear average of multiple RSSI or RSRP values) may be operations performed based on the remaining RSSI or RSRP values ​​excluding the X highest and / or Y lowest resources among the measured RSSI or RSRP values, by the configuration of the gNB or by a prior promise or agreement. This may be useful for preventing unreliable measurement values ​​from being derived due to L1 filtering according to the UE implementation.

[0197] (3) Options 1-3

[0198] In options 1-3, the UE may optionally configure IMR for interference measurement for the reporting configuration (or CSI resource / reporting configuration) for LTM configured from the gNB. In this case, resources configured as IMR may have a one-to-one correspondence with resources configured as CMR.

[0199] For example, Option 1-3 may be an appropriate method for handling interference experienced by a UE at a cell edge as well as for the purpose of handover when coordination between candidate cells to be handed over via LTM is smooth (e.g., intra-CU case). In this case, each resource set to IMR may be set with a candidate cell ID. Meanwhile, if a resource set to IMR in a 1:1 correspondence with a resource set to CMR is not set (even if it is expected that a resource set to IMR and a resource set to CMR in a 1:1 correspondence relationship will be set) (e.g., if L1-SINR reporting is set without setting a resource set to IMR corresponding to a resource set to CMR), the UE may perform interference measurement using the method of Option 1-1 or Option 1-2 and report the measured interference, L1-SINR.

[0200] 2. Determining how the UE performs interference measurements from the CSI report of LTM.

[0201] The UE can perform interference measurements related to LTM based on the methods described in Section "1" or other methods. The UE can determine / configure which method among the methods described in Section "1" or other methods to measure interference by based on an explicit indication of the gNB via RRC / MAC-CE / DCI, etc., or a configuration of a triggered reporting configuration. For example, the UE can perform interference measurements based on channel measurement resources according to the configuration or an instruction of the gNB through the above-described methods, or can perform interference measurements based on separately configured interference measurement resources. Hereinafter, the UE performing interference measurements based on configured interference measurement resources may mean performing interference measurements based on Option 1-1, Option 1-2, and / or Option 1-3 described in Section "1".

[0202] (2) Option 2-1

[0203] In Option 2-1, the UE can be explicitly instructed / configured how to perform interference measurements.

[0204] For example, the UE can receive separate signaling from the gNB as to whether to perform interference measurements using the method of Option 1-1 (e.g., deriving interference from channel measurement resources) or whether to perform interference measurements from the configured interference measurement resources. This can be useful in that the gNB has flexibility in setting / instructing interference measurements, as the gNB can effectively use both the RRM measurement results reported from the UE and the measurement results reported via LTM CSI reports when determining a candidate cell to which the UE will be handed over, since the derivation of SINR of the existing RRM measurement derives interference from the resources configured for channel measurement as in Option 1-1, and performs an operation of measuring interference from interference measurement resources configured separately from the channel measurement resources in the signaling of Layer 1.

[0205] For example, the UE can be instructed on how to perform interference measurement through the field of MAC-CE or DCI, and can apply the instructed interference measurement method. For example, the UE performs interference measurement (for LTM) through the method of Option 1-1 by default (e.g., a method of deriving interference from channel measurement resources) even if interference measurement resources are configured, but the UE can perform interference measurement based on the configured interference measurement resources when receiving a separate instruction from the gNB through signaling such as RRC / MAC-CE / DCI. Alternatively, the UE performs interference measurement based on interference measurement resources configured by default (e.g., interference measurement resources configured by Option 1-2 or Option 1-3), but can perform interference measurement based on Option 1-1 only when receiving a separate instruction from the gNB through signaling such as RRC / MAC-CE / DCI.

[0206] And / or, the UE may perform interference measurement using the method of Option 1-1, or may perform interference measurement based on interference measurement resources configured according to Option 1-2 (or Option 1-3) depending on the configuration / reporting type of the time-domain of the report. For example, the UE may derive interference values ​​from channel measurement resources for reporting configurations configured as periodic reporting or semi-persistent reporting (e.g., the method according to Option 1-1), and may perform interference measurements from the configured interference measurement resources for reporting configurations configured as aperiodic reporting (e.g., the method according to Option 1-2). This may be useful when periodic / semi-persistent reporting targets RRM measurement / reporting and long term measurement, and aperiodic reporting targets short term measurement of the channel. The UE may perform interference measurements based on values ​​derived from channel measurement resources for reporting configurations configured for periodic reporting, and may perform interference measurements from the configured interference measurement resources for reporting configurations configured for semi-persistent reporting and / or aperiodic reporting. This may be useful when targeting short-term channel measurements, as periodic reporting is similar to RRM measurement / reporting in that it targets long-term, while semi-persistent / aperiodic reporting operates based on activation / deactivation or triggering.

[0207] (2) Option 2-2

[0208] In Option 2-2, the UE can determine / determine how to perform interference measurements based on the reporting settings.

[0209] The UE may perform interference measurements using the method of Option 1-1 (e.g., deriving interference from channel measurement resources) or may perform interference measurements from configured interference measurement resources (e.g., configured via Option 1-2 or Option 1-3) depending on the triggered reporting configuration.

[0210] For example, the UE may be triggered to report based on interference measurements from the gNB even if interference measurement resources are not configured (e.g., interference measurement resources configured via Option 1-2 or Option 1-3). In this case, the UE may report interference measurements by deriving signal power and interference power respectively from the channel measurement resources configured for channel measurements according to the method described in Option 1-1. Alternatively, the UE may be triggered to report from the gNB that resources for interference measurements are configured, and in this case, the UE may report channel measurements and interference measurements by deriving interference from the configured resources respectively according to Option 1-2 or Option 1-3.

[0211] FIG. 11 is a diagram illustrating a method for a UE to perform mobility-related measurements.

[0212] Referring to FIG. 11, a UE can receive a reporting configuration including information about at least one candidate cell related to LTM (L1 / L2 Triggered Mobility) and at least one channel measurement resource based on a channel state information-reference signal (CSI-RS) resource (S111). For example, the UE can receive a reporting configuration for the at least one candidate cell and the channel measurement resource based on the CSI-RS resource through the RRC parameter of ltm-CSI-ReportConfig. Here, the reporting configuration can correspond / map each of the at least one channel measurement resource and each of the at least one candidate cell.

[0213] Next, the UE can receive interference resource configuration information related to the above reporting configuration (S113). For example, the interference resource configuration information can configure at least one indirect resource capable of performing interference measurement related to the LTM procedure with respect to the at least one candidate cell, and can configure the at least one interference resource to correspond to each cell / cell ID, as illustrated in FIG. 10 (a). In addition, as illustrated in FIG. 10 (b), the interference resource configuration information can configure one or more candidate cells (e.g., IMR candidate cells) related to interference measurement to be associated with each of the at least one candidate cell (e.g., CMR candidate cells).

[0214] Next, the UE can perform channel measurement or interference measurement for the at least one candidate cell based on at least one of the reporting configuration and the interference resource configuration information (S115). For example, if the reporting indicator (report quantity) set in the reporting configuration is L1-SINR (layer1-signal to interference plus noise ratio), the UE can perform interference measurement for the at least one candidate cell. Alternatively, if the reporting indicator set in the reporting configuration is SBRI (SS / PBCH Block Resource Indicator) or RSRP (Reference Signal Received Power), the UE can perform channel measurement for the at least one candidate cell. Meanwhile, the measurement based on the reporting configuration and the reporting of the measurement information are triggered by an instruction of DCI (CSI request field of DCI) if the reporting configuration is an aperiodic reporting configuration, triggered by an instruction of MAC-CE if the reporting configuration is a semi-persistent reporting configuration, and can be performed according to a cycle set by the reporting configuration if the reporting configuration is a periodic reporting configuration.

[0215] For example, when the reporting index set in the reporting configuration is related to interference measurement, the UE may perform interference measurement for the at least one candidate cell. Specifically, when measuring interference for a specific candidate cell among the at least one candidate cell, the UE may determine one or more candidate cells associated with the specific candidate cell based on the interference resource configuration information, and measure interference for the specific candidate cell in one or more interference measurement resources mapped / corresponded to the one or more candidate cells among the at least one interference resource. For example, the UE may derive an interference value for the specific candidate cell based on a sum (or average) of Received Signal Strength Indicators (RSSIs) or Reference Signal Received Powers (RSRPs) measured for the one or more interference measurement resources. Alternatively, the UE may derive an interference value for the specific candidate cell based on a linear average of Received Signal Strength Indicators (RSSIs) or Reference Signal Received Powers (RSRPs) measured for the one or more interference measurement resources.

[0216] Alternatively, the UE may determine whether to perform interference measurements for the at least one candidate cell on the at least one interference measurement resource based on a report type (e.g., periodic, aperiodic, semi-persistent) of the reporting configuration. For example, if the reporting configuration is configured for aperiodic measurement reporting, the UE may perform the interference measurements (option 1-2 described above) based on the at least one interference resource. Alternatively, if the reporting configuration is configured for periodic measurement reporting or semi-persistent measurement reporting, the UE may perform interference measurements (option 1-1 described above) based on the at least one channel measurement resource without considering the at least one interference resource.

[0217] Figure 12 is a diagram illustrating a method for a base station to receive a measurement report related to mobility.

[0218] Referring to FIG. 12, the base station can transmit to the UE a reporting configuration including information on at least one candidate cell related to LTM (L1 / L2 Triggered Mobility) and at least one channel measurement resource based on CSI-RS (channel state information-reference signal) resources (S121). For example, the base station can set, to the UE, a reporting configuration for the at least one candidate cell and the channel measurement resource based on CSI-RS resources through the RRC parameter of ltm-CSI-ReportConfig. Here, the reporting configuration can correspond / map each of the at least one channel measurement resource and each of the at least one candidate cell.

[0219] Next, the base station can transmit interference resource configuration information related to the above-described reporting configuration to the UE (S123). For example, the interference resource configuration information can configure at least one indirect resource capable of performing interference measurements related to the LTM procedure in relation to the at least one candidate cell, and as illustrated in FIG. 10 (a), the at least one interference resource can be configured to correspond to each cell / cell ID. In addition, as illustrated in FIG. 10 (b), the interference resource configuration information can be configured to associate one or more candidate cells related to interference measurements with each of the at least one candidate cell.

[0220] Next, the base station can receive a measurement report on a channel measurement or interference measurement for the at least one candidate cell (S125). For example, if the report quantity set in the report setting is L1-SINR (layer1-signal to interference plus noise ratio), the base station can receive a measurement report on an interference measurement measured for the at least one candidate cell. Alternatively, if the report quantity set in the report setting is SBRI (SS / PBCH Block Resource Indicator) or RSRP (Reference Signal Received Power), the base station can receive a measurement report on a channel measurement measured for the at least one candidate cell.

[0221] For example, the measurement report for the interference measurement may include interference measurement information for each of the at least one candidate cell. For example, an interference measurement value for a specific candidate cell among the at least one candidate cell may include a value measured in one or more interference measurement resources mapped / configured for one or more candidate cells associated with the specific candidate cell. The interference measurement value for the one or more interference measurement resources may be a value derived based on a sum (or average) of Received Signal Strength Indicators (RSSIs) or Reference Signal Received Powers (RSRPs) measured in the one or more interference measurement resources, or a value derived based on a linear average of Received Signal Strength Indicators (RSSIs) or Reference Signal Received Powers (RSRPs) measured in the one or more interference measurement resources.

[0222] Alternatively, the base station may receive a measurement report in which interference measurement is performed on the at least one channel measurement resource, or may receive a measurement report in which interference measurement is performed on the at least one interference measurement resource, depending on the report type of the reporting configuration (e.g., periodic, aperiodic, semi-persistent). For example, if the reporting configuration is a configuration for aperiodic measurement reporting, the base station may receive a measurement report in which interference measurement (according to the above-described option 1-2) is performed on the at least one interference resource. Alternatively, if the reporting configuration is a configuration for periodic measurement reporting or semi-persistent measurement reporting, the base station may receive a measurement report in which interference measurement (the above-described option 1-1) is performed on the at least one channel measurement resource without considering the at least one interference resource.

[0223] In this way, the proposed method can effectively support interference measurement and reporting in the LTM procedure by configuring interference measurement resources associated with the LTM procedure. Furthermore, by configuring interference measurement resources associated with the LTM procedure on a cell-by-cell basis, the proposed invention can provide candidate cell-level interference measurement values ​​appropriate for the mobility characteristics of the LTM procedure. Furthermore, by additionally considering cell-level interference measurement information in the LTM procedure, the proposed method can ensure effective cell movement even in situations where coverage overlaps between multiple cells.

[0224] Examples of communication systems to which the invention applies

[0225] Although not limited thereto, the various descriptions, functions, procedures, proposals, methods and / or operational flowcharts of the present invention disclosed in this document may be applied to various fields requiring wireless communication / connection (e.g., 5G) between devices.

[0226] Hereinafter, more specific examples will be provided with reference to the drawings. In the drawings / descriptions below, the same drawing reference numerals may represent identical or corresponding hardware blocks, software blocks, or functional blocks, unless otherwise described.

[0227] Figure 13 illustrates a communication system applied to the present invention.

[0228] Referring to FIG. 13, a communication system (1) applied to the present invention 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.

[0229] 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).

[0230] 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 invention.

[0231] Examples of wireless devices to which the present invention is applied

[0232] Figure 14 illustrates a wireless device applicable to the present invention.

[0233] Referring to FIG. 14, 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. 13.

[0234] 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 / chipset designed to implement wireless communication technology (e.g., LTE, NR). The transceiver (106) may be connected to the processor (102) and may transmit and / or receive wireless signals 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 invention, a wireless device may also mean a communication modem / circuit / chipset.

[0235] According to one example, the first wireless device or UE (100) may include a processor (102) and a memory (104) connected to the RF transceiver. The memory (104) may include at least one program capable of performing operations related to the embodiments described in FIGS. 8 to 12. The operations include receiving a reporting configuration including information about at least one candidate cell associated with LTM (L1 / L2 Triggered Mobility) and at least one channel measurement resource based on a CSI-RS (channel state information-reference signal) resource; receiving interference resource configuration information related to the reporting configuration; and performing channel measurement or interference measurement for the at least one candidate cell based on at least one of the reporting configuration and the interference resource configuration information, wherein the interference resource configuration information may configure at least one interference measurement resource for each of the at least one candidate cell.

[0236] Specifically, the processor (102) of the first wireless device or UE (100) controls the transceiver (106) to receive a reporting configuration including information on at least one candidate cell related to LTM (L1 / L2 Triggered Mobility) and at least one channel measurement resource based on a CSI-RS (channel state information-reference signal) resource, receive interference resource configuration information related to the reporting configuration, and perform channel measurement or interference measurement for the at least one candidate cell based on at least one of the reporting configuration and the interference resource configuration information, and the interference resource configuration information can configure at least one interference measurement resource for each of the at least one candidate cell.

[0237] Alternatively, a processing device may be configured including a processor (102) and a memory (104) storing instructions that perform operations when executed by the processor (102). The operations include receiving a reporting configuration including information about at least one candidate cell associated with LTM (L1 / L2 Triggered Mobility) and at least one channel measurement resource based on a CSI-RS (channel state information-reference signal) resource; receiving interference resource configuration information associated with the reporting configuration; and performing channel measurement or interference measurement for the at least one candidate cell based on at least one of the reporting configuration and the interference resource configuration information, wherein the interference resource configuration information may configure at least one interference measurement resource for each of the at least one candidate cell. Alternatively, at least one non-transitory computer-readable recording medium having instructions for performing the operations recorded thereon may be configured.

[0238] 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 invention, a wireless device may also mean a communication modem / circuit / chip.

[0239] According to one example, the second wireless device or base station (200) may include a processor (202) and a memory (204) connected to the RF transceiver. The memory (204) may include at least one program capable of performing operations related to the embodiments described in FIGS. 8 to 12.

[0240] Specifically, the processor (202) of the second wireless device or base station (200) controls the transceiver (206) or the RF transceiver to transmit a report configuration including information about at least one candidate cell related to LTM (L1 / L2 Triggered Mobility) and at least one channel measurement resource based on a CSI-RS (channel state information-reference signal) resource, transmit interference resource configuration information related to the report configuration, and receive a measurement report for channel measurement or interference measurement for the at least one candidate cell, wherein the interference resource configuration information can configure at least one interference measurement resource for each of the at least one candidate cell.

[0241] 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.

[0242] 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.

[0243] 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.

[0244] 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.

[0245] Examples of wireless devices to which the present invention is applied

[0246] Figure 15 illustrates another example of a wireless device applicable to the present invention. The wireless device may be implemented in various forms depending on the use case / service.

[0247] Referring to FIG. 15, the wireless device (100, 200) corresponds to the wireless device (100, 200) of FIG. 14 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. 15. For example, the transceiver(s) (114) may include one or more transceivers (106, 206) and / or one or more antennas (108, 208) of FIG. 14. 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).

[0248] 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. 13, 100a), a vehicle (Fig. 13, 100b-1, 100b-2), an XR device (Fig. 13, 100c), a portable device (Fig. 13, 100d), a home appliance (Fig. 13, 100e), an IoT device (Fig. 13, 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. 13, 400), a base station (Fig. 13, 200), a network node, etc. Wireless devices may be mobile or stationary depending on the use / service.

[0249] In FIG. 15, 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.

[0250] Here, the wireless communication technology implemented in the wireless device (XXX, YYY) of the present specification may include not only LTE, NR, and 6G, but also Narrowband Internet of Things for low-power communication. At this time, for example, NB-IoT technology may be an example of LPWAN (Low Power Wide Area Network) technology, and may be implemented with standards such as LTE Cat NB1 and / or LTE Cat NB2, and is not limited to the above-described names. Additionally or alternatively, the wireless communication technology implemented in the wireless device (XXX, YYY) of the present specification may perform communication based on LTE-M technology. At this time, for example, LTE-M technology may be an example of LPWAN technology, and may be called by various names such as eMTC (enhanced Machine Type Communication). For example, LTE-M technology can be implemented by at least one of various standards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-BL (non-Bandwidth Limited), 5) LTE-MTC, 6) LTE Machine Type Communication, and / or 7) LTE M, and is not limited to the above-described names. Additionally or alternatively, the wireless communication technology implemented in the wireless device (XXX, YYY) of the present specification can include at least one of ZigBee, Bluetooth, and Low Power Wide Area Network (LPWAN) considering low-power communication, and is not limited to the above-described names. For example, ZigBee technology can create PAN (personal area networks) related to small / low-power digital communication based on various standards such as IEEE 802.15.4, and can be called by various names.

[0251] The embodiments described above are combinations of components and features of the present invention 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 an embodiment of the present invention by combining some components and / or features. The order of operations described in the embodiments of the present invention 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 an embodiment or may be incorporated as a new claim through a post-application amendment.

[0252] In this document, embodiments of the present invention have been described primarily focusing on the signal transmission and reception relationship between a terminal and a base station. This transmission and reception relationship is equally / similarly extended to signal transmission and reception between a terminal and a relay or a base station and a relay. Certain operations described as being performed by a base station in this document may, in some cases, be performed by its upper node. That is, it is obvious that various operations performed for communication with a terminal in a network composed of multiple network nodes including a base station may be performed by the base station or other network nodes other than the base station. The base station may be replaced by terms such as fixed station, Node B, eNode B (eNB), and access point. In addition, the terminal may be replaced by terms such as UE (User Equipment), MS (Mobile Station), MSS (Mobile Subscriber Station).

[0253] Embodiments of the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In the case of hardware implementation, an embodiment of the present invention may be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, etc.

[0254] When implemented via firmware or software, an embodiment of the present invention may be implemented in the form of modules, procedures, functions, etc. that perform the functions or operations described above. The software code may be stored in a memory unit and executed by a processor. The memory unit may be located within or outside the processor and may exchange data with the processor via various known means.

[0255] 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 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 of the present invention are intended to be included within the scope of the present invention.

[0256] The embodiments of the present invention as described above can be applied to various mobile communication systems.

Claims

1. In the method, A step of receiving a reporting configuration including information about at least one candidate cell related to LTM (L1 / L2 Triggered Mobility) and at least one channel measurement resource based on CSI-RS (channel state information-reference signal) resources by a UE (User Equipment); The step of the UE receiving interference resource setting information related to the reporting setting; and The UE comprises a step of performing channel measurement or interference measurement for the at least one candidate cell based on at least one of the reporting setting and the interference resource setting information, A method in which the above interference resource setting information sets at least one interference measurement resource for each of the at least one candidate cell.

2. In paragraph 1, A method for setting the interference resource configuration information, wherein for each of the at least one candidate cell, one or more candidate cells among the at least one candidate cell are set in relation to the interference measurement.

3. In paragraph 2, A method wherein interference measurement for a specific candidate cell among the at least one candidate cell is performed for one or more interference measurement resources set for one or more candidate cells associated with the specific candidate cell among the at least one interference measurement resource.

4. In paragraph 3, A method in which the UE derives an interference value for the specific candidate cell based on the sum of the measured Received Signal Strength Indicator (RSSI) or Reference Signal Received Power (RSRP) for the one or more interference measurement resources.

5. In paragraph 3, A method wherein the UE derives an interference value for the specific candidate cell based on a linear average of the measured Received Signal Strength Indicator (RSSI) or Reference Signal Received Power (RSRP) for the one or more interference measurement resources.

6. In paragraph 1, A method wherein the UE performs interference measurements for each of the at least one candidate cell based on the report settings, wherein the report settings include a report quantity related to interference measurements.

7. In paragraph 6, The above reporting index is L1-SINR (layer1-signal to interference plus noise ratio), the method.

8. In paragraph 1, A method wherein the UE determines whether to perform interference measurement for the at least one candidate cell in the at least one interference measurement resource based on the report type of the report setting.

9. In at least one non-transitory computer-readable recording medium, Contains instructions that perform operations when executed by at least one processor, The above actions are, Receive a reporting configuration including information about at least one candidate cell associated with LTM (L1 / L2 Triggered Mobility) and at least one channel measurement resource based on CSI-RS (channel state information-reference signal) resources; Receive interference resource setting information related to the above reporting settings; and Comprising performing channel measurement or interference measurement for the at least one candidate cell based on at least one of the above reporting settings and the above interference resource setting information, At least one non-transitory computer-readable recording medium, wherein the interference resource setting information sets at least one interference measurement resource for each of the at least one candidate cell.

10. In UE (User Equipment), RF (Radio Frequency) transmitter and receiver; and A processor connected to the RF transceiver, The processor controls the RF transceiver to receive a reporting configuration including information about at least one candidate cell related to LTM (L1 / L2 Triggered Mobility) and at least one channel measurement resource based on a CSI-RS (channel state information-reference signal) resource, receives interference resource configuration information related to the reporting configuration, and performs channel measurement or interference measurement for the at least one candidate cell based on at least one of the reporting configuration and the interference resource configuration information. The above interference resource configuration information is a UE that configures at least one interference measurement resource for each of the at least one candidate cell.

11. In paragraph 10, The above interference resource setting information is a UE that sets one or more candidate cells associated with the at least one candidate cell for each of the at least one candidate cell in relation to the interference measurement.

12. In paragraph 11, A UE in which interference measurement for a specific candidate cell among the at least one candidate cell is performed for one or more interference measurement resources set for one or more candidate cells associated with the specific candidate cell among the at least one interference measurement resource.

13. In a processing device that controls UE (User Equipment), at least one processor; and At least one memory connected to said at least one processor and storing instructions that perform operations when executed by said at least one processor; The above actions are, Receive a reporting configuration including information about at least one candidate cell associated with LTM (L1 / L2 Triggered Mobility) and at least one channel measurement resource based on CSI-RS (channel state information-reference signal) resources; Receive interference resource setting information related to the above reporting settings; and Comprising performing channel measurement or interference measurement for the at least one candidate cell based on at least one of the above reporting settings and the above interference resource setting information, A processing device, wherein the interference resource setting information sets at least one interference measurement resource for each of the at least one candidate cell.

14. In the method, A step in which a base station transmits a reporting configuration including information about at least one candidate cell related to LTM (L1 / L2 Triggered Mobility) and at least one channel measurement resource based on CSI-RS (channel state information-reference signal) resources; The step of the base station transmitting interference resource setting information related to the reporting setting; and The step of the base station receiving a measurement report for channel measurement or interference measurement for the at least one candidate cell, A method in which the above interference resource setting information sets at least one interference measurement resource for each of the at least one candidate cell.

15. At the base station, RF (Radio Frequency) transmitter and receiver; and A processor connected to the RF transceiver, The processor controls the RF transceiver to transmit a report configuration including information about at least one candidate cell related to LTM (L1 / L2 Triggered Mobility) and at least one channel measurement resource based on a CSI-RS (channel state information-reference signal) resource, transmit interference resource configuration information related to the report configuration, and receive a measurement report for a channel measurement or interference measurement for the at least one candidate cell. A base station, wherein the above interference resource setting information sets at least one interference measurement resource for each of the at least one candidate cell.

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