Handling of CSI-RS measurements

Abstract

To handle channel state information reference signal measurement.SOLUTION: An embodiment according to the present disclosure relates to a method, a device, and a computer-readable storage medium of communication. The method implemented in a first device includes determining, at the first device, first timing of a channel state information reference signal from a target cell. The first device is configured by a second device for measuring the channel state information reference signal. The method includes determining second timing used by the first device to measure the channel state information reference signal. The method further includes determining the timing difference between the second timing and the first timing. The method further includes transmitting, to the second device, information regarding the measurement of the channel state information reference signal on the basis of the timing difference.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] Embodiments of the present disclosure generally relate to the field of telecommunications, and more particularly, to devices, methods, and computer-readable storage media for processing channel state information reference signal (CSI-RS) measurements.

Background Art

[0002] CSI-RS is designed for tracking and beam management, as well as for layer 3 (L3) mobility management, and thus for handover (HO). Compared to synchronization signal block (SSB)-based measurements, CSI-RS-based L3 measurements can provide finer beam information. Thus, CSI-RS-based L3 measurements enable a network device to directly handover a user equipment (UE) to a more sophisticated beam in a target cell during a handover procedure. CSI-RS-based L3 measurement values are affected by network synchronization and the array of received signals from different cells in the UE. These aspects together pose the problem of how to handle when there are synchronization issues with CSI-RS-based L3 measurements.

Summary of the Invention

[0003] Generally, exemplary embodiments of the present disclosure provide a solution for processing CSI-RS measurements.

[0004] In a first embodiment, a first device is provided. The first device comprises at least one processor and at least one memory containing computer program code, the at least one memory and the computer program code, using at least one processor, to provide the first device with a first timing for a channel state information reference signal from a target cell, wherein the first device is configured to measure the channel state information reference signal by a second device, and the first device determines a second timing used to measure the channel state information reference signal. The system is configured to perform the steps of determining a timing difference between a first timing and a second timing, and transmitting information regarding the measurement of a channel state information reference signal to a second device based on the timing difference.

[0005] In a second embodiment, a second device is provided, comprising at least one processor and at least one memory containing computer program code, wherein the at least one memory and the computer program code are configured to use at least one processor to cause the second device to configure the first device to measure a channel state reference signal from a target cell, and to cause the second device to receive information from the first device regarding the measurement of the channel state reference signal based on a timing difference between a first timing of the channel state reference signal and a second timing used by the first device to measure the channel state reference signal.

[0006] A third embodiment provides a method, the method comprising: determining a first timing of a channel state reference signal from a target cell in a first device, wherein the first device is configured to be measured by a second device; determining a second timing to be used by the first device to measure the channel state reference signal; determining a timing difference between the first timing and the second timing; and transmitting information regarding the measurement of the channel state reference signal to the second device based on the timing difference.

[0007] A fourth aspect provides a method, comprising the steps of: configuring a first device in a second device to measure a channel state reference signal from a target cell; and receiving information from the first device regarding the measurement of the channel state reference signal based on a timing difference between a first timing of the channel state reference signal and a second timing used by the first device, in order to measure the channel state reference signal.

[0008] In a fifth aspect, a first apparatus is provided, comprising means for determining a first timing of a channel state reference signal from a target cell, wherein the first apparatus is configured by a second apparatus for measuring the channel state reference signal; means for determining a second timing used by the first apparatus for measuring the channel state reference signal; means for determining a timing difference between the first timing and the second timing; and means for transmitting information regarding the measurement of the channel state reference signal to the second apparatus based on the timing difference.

[0009] In a sixth aspect, a second device is provided. The second device includes means for configuring the first device to measure a channel state reference signal from a target cell, and means for receiving information from the first device regarding the measurement of the channel state reference signal based on a timing difference between a first timing of the channel state reference signal and a second timing used by the first device, in order to measure the channel state reference signal.

[0010] In the seventh aspect, a computer-readable medium is provided. The computer-readable medium comprises program instructions for causing the device to perform the method according to at least the third aspect.

[0011] In the eighth aspect, a computer-readable medium is provided. The computer-readable medium comprises program instructions for causing the device to perform at least the method according to the fourth aspect.

[0012] It should be understood that the summary section of the invention is not intended to identify any important or essential features of the embodiments of this disclosure, nor is it intended to be used to limit the technical scope of this disclosure. Other features of this disclosure will be readily apparent from the following description. [Brief explanation of the drawing]

[0013] Herein, several exemplary embodiments are described with reference to the accompanying drawings. [Figure 1] Figure 1 shows an exemplary communications network in which exemplary embodiments of the present disclosure may be implemented. [Figure 2] Figure 2 shows a schematic diagram of the timing difference between different cells. [Figure 3] Figure 3 shows a flowchart illustrating an exemplary process for processing CSI-RS measurements according to several embodiments of the present disclosure. [Figure 4] Figure 4 shows a flowchart illustrating an exemplary process for processing CSI-RS measurements according to several embodiments of the present disclosure. [Figure 5] Figure 5 shows a flowchart illustrating an exemplary process for processing CSI-RS measurements according to several embodiments of the present disclosure. [Figure 6] Figure 6 shows a flowchart illustrating an exemplary process for processing CSI-RS measurements according to several embodiments of the present disclosure. [Figure 7] Figure 7 shows a flowchart of an exemplary method according to several embodiments of the present disclosure. [Figure 8] Figure 8 shows a flowchart illustrating an exemplary method according to several embodiments of the present disclosure. [Figure 9] Figure 9 shows a simplified block diagram of a device suitable for carrying out exemplary embodiments of the present disclosure. [Figure 10] Figure 10 shows a block diagram of an exemplary computer-readable medium according to an exemplary embodiment of the present disclosure.

[0014] Throughout the drawing, identical or similar reference numbers represent identical or similar elements. [Modes for carrying out the invention]

[0015] Next, the principles of this disclosure will be described with reference to several exemplary embodiments. These embodiments are described for illustrative purposes only and are intended to help those skilled in the art understand and implement this disclosure, and should not be considered to imply any limitation on the scope of this disclosure. Furthermore, the present invention can be implemented in various other forms than those described below.

[0016] Unless otherwise defined in the following description and claims, all technical and scientific terms used herein have the same meaning as they are commonly understood by one of the ordinary skills of the art to which this disclosure belongs.

[0017] References to "embodiments", "one embodiment", "exemplary embodiments", etc. in this disclosure indicate that the described embodiments may include specific features, structures, or characteristics, but not all embodiments need to include specific features, structures, or characteristics. Further, such phrases do not necessarily refer to the same embodiment. Additionally, when a specific feature, structure, or characteristic is described in relation to an embodiment, it is submitted that it is within the scope of the knowledge of those skilled in the art to affect such feature, structure, or characteristic in relation to other embodiments, whether explicitly described or not.

[0018] Terms such as "first" and "second" may be used herein to describe various elements, but it should be understood that these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of the exemplary embodiments, the first element can be called the second element, and similarly, the second element can be called the first element. As used herein, the term "and / or" includes any and all combinations of one or more of the listed terms.

[0019] The terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the exemplary embodiments. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "has", "having", "includes", and / or "including", when used herein, define the presence of the described features, elements, and / or components, etc., but do not preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof.

[0020] As used in this application, the term "circuit" can refer to one or more or all of the following. (a) A hardware-only circuit implementation (such as an implementation of only analog and / or digital circuits) and (b) A combination of a hardware circuit and software (where applicable), such as (i) A combination of analog and / or digital hardware circuits and software / firmware, and (ii) Any part of software, software, and a hardware processor having a memory (including a digital signal processor) cooperate to cause a device such as a mobile phone or a server to perform various functions. (c) A hardware circuit and / or processor, such as a microprocessor or a part of a microprocessor, that requires software (e.g., firmware) for operation may not have software when it is not required for operation.

[0021] This definition of a circuit includes any claim and applies to all uses of this term in this application. As a further example, as used in this application, the term "circuit" also includes simply a hardware circuit or processor (or processors), or a part of a hardware circuit or processor, and the implementation of its (or their) accompanying software and / or firmware. The term "circuit" includes, for example, a baseband integrated circuit or a processor integrated circuit for a mobile device or a similar integrated circuit in a server, a cellular network device, or other computing or network device when applicable to a particular claim element.

[0022] As used herein, the term “communication network” refers to a network conforming to any appropriate communication standard, such as Long-Term Evolution (LTE), LTE-A, Broadband Code Division Multiple Access (WCDMA®), High-Speed ​​Packet Access (HSPA), and Narrowband Internet of Things (NB-IoT). Furthermore, communication between terminal devices and network devices within a communication network may be carried out in accordance with any appropriate generation communication protocol, including but not limited to first-generation (1G), second-generation (2G), 2.5G, 2.75G, third-generation (3G), fourth-generation (4G), 4.5G, future fifth-generation (5G) communication protocols, and / or any other protocols currently known or to be developed in the future. Embodiments of this disclosure may be applied to a variety of communication systems. Given the rapid development in communications, there will naturally be future types of communication technologies and systems to which this disclosure can be implemented. The technical scope of this disclosure should not be considered to be limited only to the systems described above.

[0023] As used herein, the term “network device” refers to a node in a communications network from which terminal devices access the network and receive services. Depending on the terminology and technology applied, a network device may refer to a base station (BS) or access point (AP), for example, a node B (node ​​B or NB), an advanced node B (enode B or eNB), an NR NB (also called a gNB), a remote radio unit (RRU), a radio header (RH), a remote radio head (RRH), a repeater, a low-power node such as a femto or pico.

[0024] The term “terminal device” refers to any end device that may be capable of wireless communication. For example, rather than being limited, a terminal device may also be called a communication device, user equipment (UE), subscriber station (SS), portable subscriber station, mobile station (MS), or access terminal (AT). Terminal devices may include, but are not limited to, mobile phones, cell phones, smartphones, voice over IP (VoIP) phones, wireless local loop phones, tablets, wearable terminal devices, personal digital assistants (PDAs), portable computers, desktop computers, image capture terminal devices such as digital cameras, game terminal devices, music recording and playback devices, vehicle wireless terminal devices, wireless endpoints, mobile stations, laptop embedded devices (LEEs), laptop mounted devices (LMEs), USB dongles, smart devices, wireless customer premises equipment (CPEs), Internet of Things (IoT) devices, watches or other wearables, head-mounted displays (HMDs), vehicles, drones, medical devices and applications (e.g., remote surgery), industrial devices and applications (e.g., robots and / or other wireless devices operating in an industrial and / or automated processing chain context), consumer electronic device placement, and devices operating on commercial and / or industrial wireless networks. In the following description, the terms “terminal device,” “communication device,” “terminal,” “user equipment,” and “UE” may be used interchangeably.

[0025] As used herein, a measurement is defined as a "CSI-RS-based in-frequency measurement" or "in-frequency measurement" if one or more of the following conditions are met: the subcarrier spacing (SCS) of the CSI-RS resource on the adjacent cell configured for measurement is the same as the subcarrier spacing of the CSI-RS resource on the serving cell indicated for measurement; the cyclic prefix (CP) type of the CSI-RS resource on the adjacent cell configured for measurement is the same as the CP type of the CSI-RS resource on the serving cell indicated for measurement; or the center frequency of the CSI-RS resource on the adjacent cell configured for measurement is the same as the center frequency of the CSI-RS resource on the serving cell indicated for measurement. Otherwise, the measurement is defined as abbreviated as a "CSI-RS-based inter-frequency measurement" or "inter-frequency measurement".

[0026] Figure 1 shows an exemplary communication environment 100 in which embodiments of the present disclosure may be implemented. As shown in Figure 1, the environment 100 includes a first device 110, a second device 120, and a third device 130. In some exemplary embodiments, the first device 110 may be a terminal device, the second device 120 may be a network device serving the first device 110, and the third device 130 may be a network device adjacent to the second device 120. The second device 120 provides a cell 121 for the first device 110, which may be called a serving cell 121. The third device 130 provides a cell 131 for the first device 110, which may also be called a target cell 131. In some exemplary embodiments, the target cell 130 is an adjacent cell.

[0027] It should be understood that the number and types of the first, second, and third devices shown in Figure 1 are for illustrative purposes only and do not imply any limitation. Environment 100 may include any suitable number and types of first, second, and third devices adapted to implement embodiments of the present disclosure. For example, in some other exemplary embodiments, the third device may not be present, and both the target cell 131 and the serving cell 121 are provided by the second device 120.

[0028] As shown in Figure 1, the first, second, and third devices 110, 120, and 130 can communicate with each other. For example, the second device 120 and the third device 130 can transmit a reference signal (e.g., CSI-RS) over a predetermined resource, and the first device 110 can receive the reference signal based on configuration information for the predetermined resource. Furthermore, the first device 110 can measure the reference signal and transmit the measurement result to the second device 120.

[0029] Communication in communication environment 100 may be implemented according to any suitable communication protocol, including but not limited to, cellular communication protocols such as first-generation (1G), second-generation (2G), third-generation (3G), fourth-generation (4G), and fifth-generation (5G), wireless local network communication protocols such as the Institute of Electrical and Electronics Engineers (IEEE) 802.11, and / or any other protocols currently known or to be developed in the future. Furthermore, communication may utilize any suitable wireless communication technology, including but not limited to, code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), frequency division duplex (FDD), time division duplex (TDD), multiple input multiple output (MIMO), orthogonal frequency division multiple access (OFDM), discrete Fourier transform spread OFDM (DFT-s-OFDM), and / or any other technologies currently known or to be developed in the future.

[0030] The second device 120 may configure the first device 110 to measure at least the CSI-RS from the target cell 131. In some exemplary embodiments, the second device 120 may configure the first device 110 to measure the CSI-RS from a set of cells including the target cell 131. Hereinafter, such cells may be referred to collectively as “measured cells” or individually as “measured cells”.

[0031] Measurement requirements for CSI-RS-based L3 measurements include, for example, the CSI-RS measurement bandwidth for minimum requirements, CSI-RS-based in-frequency and inter-frequency definitions, in-frequency and inter-frequency measurement requirements, accuracy evaluation and specification, the number of frequency layers and additional UE measurement capabilities including the number of cells, as well as aspects of performance requirements. Furthermore, in aspects of synchronization assumptions, a single Fast Fourier Transform (FFT) may be assumed for multiple cell measurements per frequency layer for both in-frequency and inter-frequency measurements in some scenarios.

[0032] Currently, the information element (IE) CSI-RS-ResourceConfigMobility is used to configure CSI-RS-based L3 measurements. A network can be configured to perform L3 CSI-RS for mobility by configuring the UE with the IE CSI-RS-ResourceConfigMobility. This IE may be contained in the carrier-specific MeasObjectNR. Thus, a network can configure CSI-RS for L3 mobility for one or more carriers. The IE CSI-RS-ResourceConfigMobility indicates the CSI-RS resources measured in each cell on a given carrier, and each CSI-RS resource is identified by an index.

[0033] When an associated SSB is configured, the UE determines the timing of the CSI-RS resource indicated in CSI-RS-Resource-Mobility based on the timing of the cell indicated by the cell ID in CSI-RS-CellMobility. In this case, the UE needs to detect the associated SSB and the cell (SS / PBCH block) indicated by the cell ID before measuring the associated CSI-RS.

[0034] Because the configuration options are highly flexible, it was agreed to define the requirements for CSI-RS-based measurement in Rel16 to a limited extent. These requirements are defined in Rel16 only if the associated SSB is configured and detected. The motivation for this is to avoid limiting the overall use of CSI-RS-based measurement for L3 mobility to only synchronized scenarios.

[0035] When an associated SSB is configured, the UE does not need to measure the associated CSI-RS resource for L3 mobility before detecting the SS / PBCH block indicated by this associated SSB and cellId. Therefore, the UE needs to detect the associated SSB in order to obtain timing information for the target cell before it can perform measurements on the corresponding CSI-RS resource (for L3 measurements). The target cell to be measured may or may not be synchronized with the serving cell.

[0036] However, as mentioned above, a single FFT synchronization assumption exists. That is, a single FFT is used by the UE to enable simultaneous processing of CSI-RS (for L3 measurement) from multiple adjacent cells on a single carrier.

[0037] If synchronization between cells is not assumed, a timing difference may exist between the timing of the CSI-RS resources measured by the UE and the timing of a single FFT. This complicates the use of a single FFT on the UE side to perform the required measurements. For example, Figure 2 shows a schematic diagram of the timing difference between different cells. In the example shown in Figure 2, the UE can apply a single FFT within window 201. Under the above assumption regarding synchronization, the UE can apply a single FFT to decode CSI-RS211 and CSI-RS212 from the first adjacent cell and CSI-RS221 and CSI-RS222 from the second adjacent cell.

[0038] For in-frequency CSI-RS based measurements, the UE can be assumed to be using the timing of the serving cell for a single FFT. As shown in Figure 2, a timing difference T1 may exist between the serving cell and the first neighboring cell. A different timing difference T2 may exist between the serving cell and the second neighboring cell. If the timing difference exceeds a certain threshold, such as the length of some CPs, the CSI-RS measurement performance may degrade.

[0039] Degradation of CSI-RS measurement performance due to timing differences can be related to several aspects. One aspect is the cell phase synchronization accuracy on the network side, i.e., how well the cells are synchronized on the network side. Currently, the Third Generation Partnership Project (3GPP®) defines a maximum cell phase synchronization accuracy of 3us in TS 38.133. Another aspect is the influence of downlink (DL) transmission delays from different cells to the UE. Such DL transmission delays also affect cell synchronization as observed on the UE side, and whether the cells to be measured are considered well synchronized. Such DL transmission delays are unknown on both the UE side and the network side, and depend on air interface and channel conditions, so they cannot be set as a fixed value.

[0040] Therefore, the effects of timing differences must be considered under the single FFT assumption. However, none of the existing solutions have addressed the synchronization problem from the perspective of UE measurement. Solutions are needed regarding how to address CSI-RS measurement and related UE behavior in relation to CSI-RS measurement and CSI-RS measurement reporting.

[0041] According to some exemplary embodiments of this disclosure, a solution for processing CSI-RS-based L3 measurements is provided. In this solution, a first device determines a first timing of CSI-RS from a target cell. The first device is configured by a second device to measure CSI-RS from the target cell. The first device then determines a second timing used by the first device to measure CSI-RS. Subsequently, the first device determines the timing difference between the first and second timings. Based on the timing difference, the first device transmits information about the CSI-RS measurement to the second device, which may be referred to hereafter as a CSI-RS measurement. As used herein, the expression “measure CSI-RS” and its variants mean performing a measurement on a CSI-RS resource.

[0042] In this solution, the behavior of terminal devices (e.g., UEs) with respect to CSI-RS measurements is identified based on timing differences, e.g., timing differences observed at the UE. This solution can mitigate the effects of large timing differences, especially under the assumption of a single FFT on the UE side. In this way, the reported degradation of CSI-RS measurements can be known or avoided on the network side when a synchronization problem occurs in the CSI-RS measurements.

[0043] In some exemplary embodiments, if the timing difference is below a threshold, the first device may perform a CSI-RS measurement and report the results of the CSI-RS measurement to the second device. If the timing difference exceeds the threshold, the first device may not perform a CSI-RS measurement and may indicate to the second device that the CSI-RS could not be measured or was not measured because the timing difference exceeded the threshold. Alternatively, if the timing difference exceeds the threshold, the first device may continue to monitor the timing difference. If the timing difference is below the threshold, the first device may perform a CSI-RS measurement.

[0044] In such exemplary embodiments, it is ensured that the reported results of the CSI-RS measurement by the first device have qualified accuracy. If the timing difference is large, the first device (e.g., the UE side) can reduce or even avoid unnecessary CSI-RS measurement effort. Furthermore, marking to a second device (e.g., a network device) can help the second device understand the issue and avoid configuring measurements on the target cell. Additionally, it can help the second device know the quality or accuracy of the measurements reported from the first device.

[0045] In some exemplary embodiments, the first device may perform a CSI-RS measurement and report the results of the CSI-RS measurement, regardless of whether the timing difference exceeds a threshold. In this case, the first device may further indicate to the second device whether the timing difference exceeds a threshold, for example, in the measurement results, in the measurement report, or using some other separate message.

[0046] In such exemplary embodiments, the results of the CSI-RS measurement are reported to a second device, along with an indication of whether the timing difference exceeds a threshold. In this way, the second device (e.g., a network device) can determine whether the reported results are accurate. For example, the reported results may hold a specific value or indicator that shows whether the reported results are accurate.

[0047] Next, several exemplary embodiments will be described in detail below. Figure 3 shows a flowchart illustrating an exemplary process 300 for processing CSI-RS measurements according to some embodiments of the present disclosure. For illustrative purposes, process 300 will be described with reference to Figure 1. Process 300 includes at least a first device 110 and a second device 120, as shown in Figure 1.

[0048] As shown in the figure, the second device 120 configures the first device 110 to measure CSI-RS from a target cell 131, which may be referred to as the “target CSI-RS” in 305. The second device 120 may transmit a configuration for CSI-RS measurement to the first device 110. The configuration for CSI-RS measurement may include a designation of an SSB associated with the configured CSI-RS, which may also be referred to as the “associated SSB”. For example, the second device 120 may transmit an IE CSI-RS-ResourceConfigMobility or other appropriate IE to the first device 110, which may include an index of the associated SSB. In some exemplary embodiments, in addition to the target cell 131, the second device 120 may configure the first device 110 to measure CSI-RS from one or more other cells.

[0049] The first device 110 determines the timing of the CSI-RS from the target cell 131 (also called the "first timing") in 310. The first timing may be the DL timing of the target cell 131 and may be determined by any suitable method. In one example, the first timing may be determined based on the relevant SSB of the target cell 131. The relevant SSB of the target cell 131 may be configured. For example, the index of the relevant SSB may be included in the configuration for the CSI-RS measurement. The first device 110 may detect the relevant SSB of the CSI-RS resource in the target cell 131 and determine the first timing based on the relevant SSB. In this way, the timing of the relevant SSB, and therefore the timing of the CSI-RS from the target cell 131, is determined.

[0050] The first device 110 determines a second timing used by the first device 110 to measure the CSI-RS in 312. The second timing can be considered a reference timing used by the first device 110 when measuring the CSI-RS. For example, under the assumption of a single FFT, the second timing may be the timing of the single FFT to be applied to decode the CSI-RS.

[0051] In some exemplary embodiments, the first device 110 can determine a second timing based on timing information from the serving cell 121. For example, the second timing may be determined based on the SSB of the serving cell 121. If the target CSI-RS measurement is an in-frequency measurement, the second timing may be determined based on the SSB of the serving cell 121.

[0052] In some exemplary embodiments, the first device 110 can determine a reference cell from a set of cells to be measured, including the target cell 131. The second device 120 can configure the first device 110 to measure CSI-RS from a set of cells on a carrier. The first device 110 can then determine a second timing based on the timing information of the reference cell. For example, if the measurement of the target CSI-RS is an inter-frequency measurement, the second timing, i.e., the timing used to measure the CSI-RS resource on the carrier, may be determined based on the timing of the reference cell to be measured, rather than the serving cell 121. For example, the second timing may be determined based on the relevant SSB of the reference cell.

[0053] For interfrequency measurements, any suitable method may be used to determine the second timing, for example, the timing of a single FFT under the assumption of a single FFT. As an example, the first device 110 may determine the second timing based on the timing of the cell with the highest signal strength in the set of cells. As another example, the first device 110 may determine the second timing based on the timing of the first cell detected by the first device 110 in the set of cells. As yet another example, the first device 110 may determine the second timing based on the timing of the cell with the highest or lowest index in the set of cells. As yet another example, the first device 110 may determine the second timing based on the timing of the cell that aligns with as many other cells as possible. Alternatively, the first device 110 may determine the second timing by applying a timing offset to the cell timing so that as many CSI-RS resources as possible are measured within a timing difference within a threshold.

[0054] Continuing with Figure 3, the first device 110 determines the timing difference between the first timing and the second timing (315). In some exemplary embodiments, for example, in the case of in-frequency measurement, the timing difference between the first timing and the second timing may represent the timing difference between the serving cell 121 and the target cell 131. In these exemplary embodiments, the first device 110 determines the timing difference based on the SSB of the serving cell 121 and the associated SSB of the CSI-RS resource in the target cell 131.

[0055] In some other exemplary embodiments, for example, in the case of inter-frequency measurement, the timing difference between the first timing and the second timing may represent the timing difference between the target cell 131 and a reference cell determined from the set of cells to be measured. In these exemplary embodiments, the first device 110 may determine the timing difference based on the relevant SSB of the target cell 131 and the SSB of the reference cell.

[0056] The first device 110 transmits information regarding the measurement of the target CSI-RS at 320 to the second device 120 based on the timing difference. The specific content of the transmitted information may depend on whether the timing difference requirement is met. For example, the timing difference requirement is met if the timing difference is below a threshold. The threshold could be, for example, CP, half of CP, or the number of CPs.

[0057] In some exemplary embodiments, the first device 110 may decide whether to perform and report a target CSI-RS measurement based on whether the timing difference is below a threshold, or the second device 120 may instruct the first device 110 to do so. For example, the first device 110 may perform a target CSI-RS measurement and report the measurement result only if the timing difference is below a threshold. If the timing difference exceeds the threshold, the first device 110 may not perform a target CSI-RS measurement and may indicate to the second device 120 that the target CSI-RS measurement failed. In other words, the first device 110 shall not measure or report a CSI-RS measurement from cells that do not meet the timing difference requirement. Such exemplary embodiments will be described in detail with reference to Figures 4 and 5.

[0058] In some exemplary embodiments, a first device 110 may perform or be instructed by a second device 120 to perform a target CSI-RS measurement and report the measurement result regardless of whether the timing difference exceeds a threshold. In such exemplary embodiments, the first device 110 may further indicate to the second device 120 whether the timing difference exceeds a threshold. Such exemplary embodiments will be described in detail with reference to Figure 6.

[0059] Figure 4 shows a flowchart illustrating an exemplary process 400 for processing CSI-RS measurements according to some exemplary embodiments of the present disclosure. The exemplary process 400 may be considered a specific implementation of process 300. Process 400 includes at least a first device 110, a second device 120, and a third device 130, as shown in Figure 1. As shown in Figure 4, in process 400, the third device 130 may transmit an SSB (e.g., including the associated SSB) and a CSI-RS (e.g., the target CSI-RS) from the target cell 131 to the first device 110.

[0060] As shown in the figure, the second device 120 configures the first device 110 at 305 to measure the target CSI-RS from the target cell 131 provided by the third device 130. The first device 110 detects the associated SSB 405 for the target CSI-RS to obtain the timing of the target cell 131 (410). In this way, the first timing of the target CSI-RS is determined to be the timing of the associated SSB, i.e., the timing of the target cell 131.

[0061] The first device 110 determines a second timing used by the first device 110 to measure the CSI-RS in 412. The second timing can be determined as described above with respect to operation 312 in Figure 3. For example, in the case of an in-frequency measurement, the second timing may be determined to be the timing of serving cell 121, for example, based on the SSB of serving cell 121. In the case of an inter-frequency measurement, the second timing may be determined to be the timing of a reference cell from the set of cells to be measured. For example, the second timing may be determined based on the SSB of the reference cell.

[0062] The first device 110 determines the timing difference between the first timing and the second timing (415). The timing difference can be determined as described above with reference to Figure 3. For example, in the case of in-frequency measurement, the first device 110 may determine the timing difference based on the relevant SSB of the target cell 131 and the SSB of the serving cell 121. In the case of inter-frequency measurement, the first device 110 may determine the timing difference based on the relevant SSB of the target cell 131 and the SSB of the reference cell.

[0063] In block 420, the first device 110 determines whether the timing difference is less than a threshold. If the timing difference is less than a threshold, process 400 proceeds to block 401. As shown in the figure, the first device 110 can measure CSI-RS422 from the target cell 131 provided by the third device 130 (425). In other words, the first device 110 can perform a CSI-RS422 measurement. Then, in 430, the first device 110 transmits the result of the CSI-RS422 measurement to the second device 120. For example, the first device 110 can transmit a measurement report to the second device 120. Thus, the result of the CSI-RS measurement received by the second device can have qualified accuracy. This ensures the performance of the CSI-RS measurement.

[0064] In block 420, if the first device 110 determines that the timing difference exceeds a threshold, process 400 proceeds to block 402. As shown in the figure, the first device 110 may send a notification to the second device 120 indicating that it is unable to measure the CSI-RS from the target cell 131, or that it cannot measure it with adequate accuracy, because the timing difference exceeds a threshold (435). For illustrative purposes only, without limiting the scope of this discussion, such a notification may be referred to below as a “failure notification”. A failure notification may indicate that the second device 120 has failed to measure the CSI-RS from the target cell 131. After receiving a failure notification, the second device 1120 may deconfigure the CSI-RS measurement on the target cell 131. For example, in 440, the second device 120 may send a notification to the first device 110 to disable the measurement of the CSI-RS from the target cell 131 (also called a “configuration notification”).

[0065] Figure 5 shows a flowchart illustrating an exemplary process 500 for processing CSI-RS measurements according to several embodiments of the present disclosure. The exemplary process 500 may be considered a specific implementation of process 300. Process 500 includes at least a first device 110, a second device 120, and a third device 130, as shown in Figure 1. As shown in Figure 5, in process 500, the third device 130 may transmit an SSB (e.g., including the relevant SSB) and a CSI-RS (e.g., target CSI-RS) from a target cell 131 to the first device 110. Only the differences between process 400 and process 500 are described.

[0066] In block 420, if the first device 110 determines that the timing difference exceeds a threshold, process 500 proceeds to block 502. Instead of immediately indicating to the second device 120 that the CSI-RS measurement has failed, the first device 110 may continue tracking the timing difference. As shown in Figure 5, in block 502, the first device 110 may continue tracking the timing of the target cell 131 for a certain period of time. For example, a timer may be started when it is determined that the timing difference exceeds a threshold. If the timing difference falls below the threshold within the period of time or before the timer expires, the first device 110 may perform a CSI-RS measurement from the target cell 131 and report the measurement results to the second device 120. If the timing difference still exceeds the threshold at the end of the period of time, the first device 110 may indicate to the second device 120 that the target CSI-RS and / or target cell 131 cannot be measured or cannot be measured with qualified accuracy.

[0067] As shown in the figure, the first device 110 can detect the associated SSB 530 from the target cell 131 to obtain the updated first timing (535). In other words, the updated timing of the target cell 131 can be obtained. Thus, the first device 110 can update the timing difference based on the updated first and second timings. In block 540, the first device 110 can determine whether the updated timing difference falls below a threshold. If the updated timing difference falls below the threshold within the time period or before the timer expires, process 500 proceeds to block 503. In 545, the first device 110 measures the CSI-RS from the target cell 131. In other words, the first device 110 can perform a CSI-RS measurement. Next, the first device 110 may transmit the results of the CSI-RS measurement to the second device 120 (550). For example, the first device 110 may transmit a measurement report to the second device 120. Thus, the results of the CSI-RS measurement received by the second device 120 can have qualified accuracy. This ensures the performance of the CSI-RS measurement.

[0068] In block 540, if the first device 110 determines that the timing difference still exceeds a threshold at the end of the time period, the first device 110 may transmit a failure indicator to the second device 120 (555) indicating that it is unable to measure the CSI-RS from the target cell 131, or cannot measure it with qualified accuracy, because the timing difference exceeds the threshold. The failure indicator may indicate that the second device 120 has failed to measure the CSI-RS from the target cell 131. Although not shown, the second device 120 may deconfigure the CSI-RS measurement on the target cell 131 after receiving the failure indicator. For example, the second device 120 may transmit a configuration indicator to the first device 110 to disable the measurement of the CSI-RS from the target cell 131.

[0069] In the exemplary embodiments described above with reference to Figures 4 and 5, the principle is to measure the configured CSI-RS from the target cell based on the timing difference. For example, in the case of in-frequency measurement, based on the timing difference between the serving cell and the target cell, the first device (e.g., UE) is only required to measure the configured CSI-RS for L3 if the timing difference is below a defined threshold. Otherwise, the first device does not need to measure the CSI-RS for L3 from the target cell. The first device shall not report the measurement of L3CSI-RS from cells where the timing difference requirement is not met.

[0070] In such exemplary embodiments, the accuracy of the reported results of the CSI-RS measurement can be guaranteed. When the timing difference is large, unnecessary effort for the CSI-RS measurement can be avoided at the first device (e.g., the UE side). Furthermore, marking to a second device (e.g., a network device) can help the second device understand the issue and avoid configuring the measurement on the target cell.

[0071] Figure 6 shows a flowchart illustrating an exemplary process 600 for processing CSI-RS measurements according to several embodiments of the present disclosure. The exemplary process 600 may be considered a specific implementation of process 300. Process 600 includes at least a first device 110, a second device 120, and a third device 130, as shown in Figure 1. As shown in Figure 6, in process 600, the third device 130 may transmit an SSB (e.g., including the relevant SSB) and a CSI-RS (e.g., target CSI-RS) from the target cell 131 to the first device 110. Only the differences between process 400 and process 600 are described.

[0072] In block 420, the first device 110 determines whether the timing difference is below a threshold. The process then proceeds to block 601. As shown in the figure, the first device 110 can measure the CSI-RS620 from the target cell 131 provided by the third device 130 (625). In other words, the first device 110 can perform a measurement of the CSI-RS620. The first device 110 then transmits the result of the CSI-RS620 measurement and an indication (also called a "timing indication") whether the timing difference is below a threshold to the second device 120 in 630. For example, the first device 110 may transmit a measurement report to the second device 120. The first device 110 may add a specific value to the measurement report. This specific value may implicitly indicate that the CSI-RS is measured without meeting the timing difference threshold or with a problematic timing difference. Alternatively, the first device 110 may transmit the measurement results and further transmit an indication that the CSI-RS is measured without meeting the timing difference threshold or with a problematic timing difference. In this way, a second device (e.g., a network device) can know whether the reported results are accurate. In some exemplary embodiments, if the timing indication shows that the timing difference exceeds the threshold, the second device 120 may deconfigure the CSI-RS measurement on the target cell 131. For example, the second device 120 may transmit a configuration indication to the first device 110 to disable the CSI-RS measurement from the target cell 131.

[0073] In exemplary processes 400, 500, and 600, the second device 120 and the third device 130 are shown separately. In some exemplary embodiments, the second device 120 and the third device 130 may be the same, the operations described for the second device 120 may be performed in a serving cell, and the operations described for the third device 130 may be performed in a separate cell.

[0074] Figure 7 shows a flowchart of an exemplary method 700 implemented in a first device 110 according to some exemplary embodiments of the present disclosure. For illustrative purposes, method 700 is described in reference to the first device 110 with respect to Figure 1. In block 710, the first device 110 determines a first timing of a channel state information reference signal from a target cell. The first device 110 is comprised of a second device 120 for measuring the channel state information reference signal. In some exemplary embodiments, the first device 110 may detect a synchronization signal block of the target cell associated with the channel state information reference signal and determine the first timing based on the synchronization signal block.

[0075] In block 720, the first device 110 determines a second timing used by the first device 110 to measure a channel state information reference signal. In some exemplary embodiments, the first device 110 may determine the second timing based on timing information of the serving cell 121 provided by the second device 120.

[0076] In some exemplary embodiments, a first device 110 may determine a cell from a set of cells containing a target cell. A first device 100 is configured to measure a channel state information reference signal from the set of cells. The first device 110 may determine a second timing based on the timing information of the determined cell.

[0077] In block 730, the first device 110 determines the timing difference between the first timing and the second timing. In block 740, based on the timing difference, the first device 110 transmits information regarding the measurement of the channel state information reference signal to the second device 120.

[0078] In some exemplary embodiments, if the timing difference falls below a threshold, the first device 110 may perform a measurement of the channel state information reference signal and transmit the measurement result to the second device 120.

[0079] In some exemplary embodiments, if the timing difference exceeds a threshold, the first device 110 may transmit an indication to the second device 120 that the timing difference exceeds a threshold. In some exemplary embodiments, the first device 110 may receive a configuration indication from the second device 120 to disable the measurement of the channel state information reference signal.

[0080] In some exemplary embodiments, if the timing difference exceeds a threshold, the first device 110 may obtain an updated first timing from the target cell and update the timing difference based on the updated first and second timings. If the updated timing difference falls below the threshold within a time period, the first device 110 may perform a measurement of the channel state information reference signal and transmit the measurement result to the second device 120. In some exemplary embodiments, if the updated timing difference exceeds the threshold for a time period, the first device 110 may transmit an indication to the second device 120 that the time difference exceeds the threshold. In some exemplary embodiments, the first device 110 may further receive a configuration indication from the second device 120 to disable the measurement of the channel state information reference signal.

[0081] In some exemplary embodiments, the first device 110 may perform a measurement of a channel state information reference signal and transmit the measurement result and a timing indicator indicating whether the timing difference exceeds a threshold to the second device 120. In some exemplary embodiments, the timing indicator may indicate a timing difference that exceeds a threshold. The first device 110 may receive a configuration indicator from the second device 120 to disable the measurement of the channel state information reference signal.

[0082] Figure 8 shows a flowchart of an exemplary method 800 implemented in a second device according to some exemplary embodiments of the present disclosure. For illustrative purposes, method 800 is described in reference to the second device 120 with respect to Figure 1.

[0083] In block 810, the second device 120 configures the first device 110 to measure a channel state reference signal from a target cell. In block 820, the second device 120 receives information from the first device 110 regarding the measurement of the channel state reference signal, based on the timing difference between a first timing of the channel state reference signal and a second timing used by the first device 110 to measure the channel state reference signal.

[0084] In some exemplary embodiments, a second device 120 can receive measurement results from the first device 110.

[0085] In some exemplary embodiments, the second device 120 can receive an indication from the first device 110 that the timing difference exceeds a threshold. In some exemplary embodiments, the second device 120 can transmit a configuration indication to the first device 110 to disable the measurement of the channel state information reference signal.

[0086] In some exemplary embodiments, the second device 120 can receive from the first device 110 the measurement results and a timing indicator indicating whether the timing difference exceeds a threshold.

[0087] In some exemplary embodiments, if the timing indicator shows a timing difference exceeding a threshold, the second device 120 may send a configuration indicator to the first device 110 to disable the measurement of the channel state information reference signal.

[0088] In some exemplary embodiments, a first apparatus (e.g., a first device 110) capable of performing any of the methods 700 may comprise means for performing each operation of the methods 700. These means can be implemented in any preferred form. For example, these means may be implemented in a circuit or a software module. The first apparatus may be implemented as or included within the first device 110.

[0089] In some exemplary embodiments, the first device comprises means for determining a first timing of a channel state reference signal from a target cell, the first device is configured by a second device for measuring the channel state reference signal, and the first device comprises means for determining a second timing used by the first device to measure the channel state reference signal, means for determining a timing difference between the first timing and the second timing, and means for transmitting information regarding the measurement of the channel state reference signal to the second device based on the timing difference.

[0090] In some exemplary embodiments, means for determining a first timing include means for detecting a synchronization signal block of a target cell associated with a channel state information reference signal, and means for determining the first timing based on the synchronization signal block.

[0091] In some exemplary embodiments, means for determining a second timing include means for determining a second timing based on the timing of a serving cell provided by a second device.

[0092] In some exemplary embodiments, means for determining a second timing comprises means for determining a cell from a set of cells comprising a target cell, wherein the first device is configured to measure a channel state information reference signal from the set of cells, and means for determining a second timing based on timing information of the determined cell.

[0093] In some exemplary embodiments, the means for transmitting information includes means for performing a measurement of the channel state information reference signal in response to the determination that the timing difference is below a threshold, and transmitting means for transmitting the measurement result to the second device.

[0094] In some exemplary embodiments, the means for transmitting includes means for transmitting a timing difference exceeding a threshold to a second device, in accordance with the determination that the timing difference exceeds a threshold. In some exemplary embodiments, the first device further includes means for receiving a configuration indication from the second device for disabling the measurement of a channel state information reference signal.

[0095] In some exemplary embodiments, means for transmitting information include means for obtaining an updated first timing from a target cell in accordance with a determination that the timing difference exceeds a threshold; means for updating the timing difference based on the updated first and second timings; means for performing a measurement of a channel state information reference signal in accordance with a determination that the updated timing difference falls below a threshold for a time period; and means for transmitting the results of the measurement to a second device. In some exemplary embodiments, the first device further includes means for transmitting an indication to the second device that the time difference exceeds a threshold in accordance with a determination that the updated timing difference exceeds the threshold for the time period. In some exemplary embodiments, the first device further includes means for receiving a configuration indication from the second device for disabling the measurement of the channel state information reference signal.

[0096] In some exemplary embodiments, means for transmitting information include means for performing a measurement of a channel state information reference signal, and means for transmitting the measurement result and a timing indicator indicating whether the timing difference exceeds a threshold to a second device. In some exemplary embodiments, the timing indicator may indicate a timing difference that exceeds a threshold. The first device further includes means for receiving a configuration indicator from the second device for disabling the measurement of the channel state information reference signal.

[0097] In some exemplary embodiments, the second device includes means for configuring the first device to measure a channel state reference signal from a target cell, and means for receiving information from the first device regarding the measurement of the channel state reference signal based on a timing difference between a first timing of the channel state reference signal and a second timing used by the first device for measuring the channel state reference signal.

[0098] In some exemplary embodiments, the first means includes means for receiving measurements from the first device.

[0099] In some embodiments, the means for receiving the information includes means for receiving an indication from the first device that the timing difference exceeds a threshold. In some exemplary embodiments, the second device further includes means for transmitting a configuration indication to the first device for disabling the measurement of the channel state information reference signal.

[0100] In some exemplary embodiments, means for receiving information include means for receiving from a first device the result of a measurement and a timing indication indicating whether the timing difference exceeds a threshold. In some exemplary embodiments, a second device further includes means for transmitting a configuration indication to the first device for disabling the measurement of a channel state information reference signal in accordance with the determination that the timing indication indicates a timing difference exceeding a threshold.

[0101] Figure 9 is a simplified block diagram of a device 900 suitable for carrying out embodiments of the present disclosure. The device 900 may be provided to implement a communication device, for example, a first device 110, a second device 120, and a third device 130, as shown in Figure 1. As shown, the device 900 includes one or more processors 910, one or more memories 920 coupled to the processors 910, and one or more communication modules 940 (such as transmitters and / or receivers) coupled to the processors 910.

[0102] The communication module 940 is for bidirectional communication. The communication module 940 has at least one antenna to facilitate communication. The communication interface may represent any interface necessary for communication with other network elements.

[0103] The processor 910 may be of any type suitable for a local technology network and, in non-limiting examples, may include one or more of general-purpose computers, dedicated computers, microprocessors, digital signal processors (DSPs), and processors based on multicore processor architectures. The device 1200 may have multiple processors, such as application-specific integrated circuit chips that are time-dependent to a clock that synchronizes the main processor.

[0104] Memory 920 may include one or more non-volatile memories and one or more volatile memories. Examples of non-volatile memories include, but are not limited to, ROM (Read Only memory) 924, EPROM (electrically programmable read-only memory), flash memory, hard disks, CDs (compact discs), DVDs (digital video discs), and other magnetic and / or optical storage devices. Examples of volatile memories include, but are not limited to, random access memory (RAM) 922, and other volatile memories that do not last during a power-down period.

[0105] The computer program 930 includes computer executable instructions that are executed by the associated processor 910. The program 930 may be stored in ROM 920. The processor 910 can perform any appropriate operations and processes by loading the program 930 into RAM 920.

[0106] Embodiments of the present disclosure can be implemented by means of program 930 so that device 900 can perform any of the processes of the present disclosure described in relation to Figures 7-8. Embodiments of the present disclosure can also be implemented by hardware or by a combination of software and hardware.

[0107] In some embodiments, the program 930 may be tangibly contained in computer-readable media, which may be contained in device 900 (such as memory 920) or other storage devices accessible by device 900. Device 900 may load the program 930 from the computer-readable media into RAM 922 for execution. The computer-readable media may include any type of tangible non-volatile memory, such as ROM, EPROM, flash memory, hard disk, CD, or DVD. Figure 10 shows an example of computer-readable media 1000 in the form of a CD or DVD. The computer-readable media has the program 930 stored thereon.

[0108] In general, various embodiments of this disclosure may be implemented in hardware or dedicated circuitry, software, logic, or any combination thereof. Some embodiments may be implemented in hardware, while others may be implemented in firmware or software that can be executed by a controller, microprocessor, or other computing device. Various embodiments of this disclosure are illustrated and described using block diagrams, flowcharts, or some other pictograms, but it should be understood that any blocks, apparatus, systems, techniques, or methods described herein may be implemented, in non-limiting examples, in hardware, software, firmware, dedicated circuitry or logic, general-purpose hardware or controllers, or other computing devices, or any combination thereof.

[0109] This disclosure also provides at least one computer program product tangibly stored on a non-temporary computer-readable storage medium. The computer program product includes computer-executable instructions, such as those contained in a program module, which are executed on a device on a target real or virtual processor to perform the methods 700 or 800 described above with reference to Figures 7-8. Generally, a program module includes routines, programs, libraries, objects, classes, components, data structures, etc., that perform a specific task or implement a specific abstract data type. The functionality of program modules can be combined or divided among program modules as desired in various embodiments. The machine-executable instructions for a program module can be executed in a local device or a distributed device. In a distributed device, program modules can reside on both local and remote storage media.

[0110] Program code for performing the methods of this disclosure may be written in any combination of one or more programming languages. This program code may be provided to a processor or controller of a general-purpose computer, a dedicated computer, or other programmable data processing device, so that when executed by the processor or controller, the program code implements the functions / operations specified in the flowcharts and / or block diagrams. The program code may run entirely on a machine, partially on a machine, as a standalone software package, partially on a machine, partially on a remote machine, or entirely on a remote machine or server.

[0111] In the context of this disclosure, computer program code or related data may be carried by any suitable carrier to enable a device, apparatus, or processor to perform the various processes and operations described above. Examples of carriers include signals, computer-readable media, and the like.

[0112] Computer-readable media may be computer-readable signal media or computer-readable storage media. Computer-readable media may include, but are not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. More specific examples of computer-readable storage media include electrical connections having one or more wires, portable computer diskettes, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0113] Furthermore, although the operations are described in a specific order, this should not be understood as requiring that such operations be performed in a specific or sequential order, or that all described operations be performed, in order to achieve the desired result. In certain circumstances, multitasking and parallel processing may be advantageous. Similarly, some specific implementation details are included in the above description, but these should be interpreted not as limitations on the scope of this disclosure, but rather as descriptions of features that may be specific to a particular embodiment. Certain features described in the context of a separate embodiment may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may be implemented separately or in any suitable combination in multiple embodiments.

[0114] While this disclosure has been described in language specific to structural features and / or methodological actions, it should be understood that the disclosure as defined in the attached claims is not necessarily limited to the specific features or actions described above. Rather, the specific features and actions described above are disclosed as exemplary formations for implementing the claims.

Claims

1. A first device (110, 900) for handling CSI-RS measurements, The first device (110, 900) comprises at least one processor (910) and at least one memory (920), The at least one memory (920), together with the at least one processor (910), provides at least the first device (110, 900) A step of determining a first timing of a channel state information reference signal from a target cell, wherein the first device (110, 900) is configured by a second device (120, 900) to measure the channel state information reference signal; The steps include determining a second timing used by the first device (110, 900) to measure the channel state information reference signal, A step of determining the timing difference between the first timing and the second timing, The steps include transmitting information regarding the measurement of the channel state information reference signal to the second device (120, 900) based on the timing difference, In accordance with the determination that the timing difference is less than the threshold, the measurement of the channel state information reference signal is performed, and To transmit the results of the measurement to the second device, The steps include transmitting the aforementioned information, A first device configured to perform the following action.

2. The at least one memory, together with the at least one processor, is provided in the first device. A step of detecting the synchronization signal block of the target cell associated with the channel state information reference signal, The steps include determining the first timing based on the synchronization signal block, The first device according to claim 1, configured to determine the first timing by the above.

3. The at least one memory, together with the at least one processor, is provided in the first device. The step of determining the second timing based on the timing information of the serving cell provided by the second device. The first device according to claim 1 or 2, configured to determine the second timing by the above.

4. The at least one memory, together with the at least one processor, is provided in the first device. A step of determining a cell from a set of cells comprising the target cell, wherein the first device is configured to measure a channel state information reference signal of the cell from the set; The steps include determining the second timing based on the timing information of the cell determined above, The first device according to claim 1 or 2, configured to determine the second timing by the above.

5. The at least one memory, together with the at least one processor, is provided in the first device. Steps to transmit a notification to the second device indicating that the timing difference exceeds the threshold, in accordance with the determination that the timing difference exceeds the threshold. The first device according to claim 1, configured to transmit the aforementioned information.

6. The at least one memory, together with the at least one processor, is provided in the first device. The steps include obtaining the updated first timing from the target cell in accordance with the determination that the timing difference exceeds a threshold, A step of updating the timing difference based on the updated first timing and the second timing, If it is determined that the updated timing difference falls below the threshold within the time, the step of performing the measurement of the channel state information reference signal, The steps include transmitting the measurement results to the second device, The first device according to claim 1, configured to transmit the aforementioned information.

7. The at least one memory, together with the at least one processor, is provided in the first device. The first device according to claim 6, configured to cause the second device to transmit an indication that the timing difference exceeds the threshold, in accordance with the determination that the updated timing difference exceeds the threshold for the given time.

8. The at least one memory, together with the at least one processor, is provided in the first device. The second device receives a configuration indication to disable the measurement of the channel state information reference signal. The first device according to claim 5 or 7, configured as follows.

9. The at least one memory, together with the at least one processor, is provided in the first device. The steps include: performing the measurement of the channel state information reference signal; The steps include transmitting the measurement results and a timing indicator indicating whether the timing difference exceeds a threshold to the second device, The first device according to claim 1, configured to transmit the aforementioned information.

10. The first device in which the timing indicator shows a timing difference exceeding the threshold, The at least one memory, together with the at least one processor, is provided in the first device. The second device receives a configuration indication to disable the measurement of the channel state information reference signal. The first device according to claim 9, configured as described above.

11. A second device (120, 900) for processing CSI-RS measurements, the second device (900) comprising at least one processor (910) and at least one memory (920), The at least one memory (920), together with the at least one processor (910), provides at least the second device (120, 900) The steps include configuring a first device (110, 900) to measure a channel state information reference signal from a target cell, The steps include receiving information regarding the measurement of the channel state information reference signal from the first device (110, 900) based on the timing difference between the first timing of the channel state information reference signal and the second timing used by the first device (110, 900) to measure the channel state information reference signal, The steps include receiving the information by receiving the measurement results from the first device, A second device configured to perform the following action.

12. The at least one memory, together with the at least one processor, is provided to the second device. The step of receiving a signal from the first device indicating that the timing difference exceeds a threshold. The second device according to claim 11, configured to receive the aforementioned information.

13. The at least one memory, together with the at least one processor, is provided to the second device. The first device is instructed to transmit a configuration indication to disable the measurement of the channel state information reference signal. The second device according to claim 12, configured as follows.

14. The at least one memory, together with the at least one processor, is provided to the second device. The first device receives the measurement result and a timing indicator indicating whether the timing difference exceeds a threshold. The second device according to claim 11, configured to receive the aforementioned information.

15. The at least one memory, together with the at least one processor, is provided to the second device. In accordance with the determination that the timing indicator shows a timing difference exceeding the threshold, the first device transmits a configuration indicator to disable the measurement of the channel state information reference signal. The second device according to claim 14, configured as described above.

16. A method for processing CSI-RS measurements, A first device (110, 900) determines a first timing of a channel state information reference signal from a target cell, wherein the first device (110, 900) is configured by a second device (120, 900) to measure the channel state information reference signal. The steps include determining a second timing used by the first device (110, 900) to measure the channel state information reference signal, A step of determining the timing difference between the first timing and the second timing, The steps include transmitting information regarding the measurement of the channel state information reference signal to the second device (120, 900) based on the timing difference, In accordance with the determination that the timing difference is less than the threshold, the measurement of the channel state information reference signal is performed, and To transmit the results of the measurement to the second device, The steps include transmitting the aforementioned information, A method that includes this.

17. A method for processing CSI-RS measurements, The second device (120, 900) is configured to measure a channel state information reference signal from a target cell, and the first device (110, 900) is configured for this purpose. The steps include receiving information regarding the measurement of the channel state information reference signal from the first device (110, 900) based on the timing difference between a first timing for the channel state information reference signal and a second timing used by the first device (110, 900) to measure the channel state information reference signal, The steps include receiving the information by receiving the measurement results from the first device, Methods that include...

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