Method, terminal device, and network device

Abstract

Embodiments of the present disclosure provide a communication method, a communication device, and a computer-readable medium. The method includes: determining, at a terminal device, link qualities of reference signals in a first set and a second set of reference signals received from a network device, where the first set of reference signals is associated with a first control resource set and the second set of reference signals is associated with a second control resource set; and, according to determining that the link quality of each reference signal in the first set is lower than a first threshold quality, transmitting signaling for link recovery to the network device, the signaling including a first instruction for the first control resource set. The method includes receiving the signaling for link recovery at the network device and performing a link recovery procedure for the first control resource set. In this way, BFR is performed for each TRP, thereby achieving reduced delay and improved efficiency.

Description

Technical Field

[0001] Embodiments of the present disclosure generally relate to the field of telecommunications, and more particularly to a communication method, a communication device, and a computer-readable medium for beam failure recovery (BFR).

Background Art

[0002] Due to the increased free space path loss in the higher frequency bands supported in New Radio access (NR), channel or signal transmission relies on highly directional links. However, a directional link requires precise alignment of the transmitter beam and the receiver beam, which is achieved by a set of operations known as beam management. For example, beam management can generally include operations such as beam sweeping, beam measurement, beam determination, and beam reporting. These operations can be repeated periodically to update the optimal transmitter and receiver beam pairs over time.

[0003] Beam failure may occur when the quality of one or more beam pairs of the associated control channel degrades sufficiently. A mechanism for recovering from beam failure can be triggered when a beam failure (also referred to herein as a link failure) occurs. The BFR mechanism on the terminal device side typically includes at least one of beam failure detection (BFD), identification of new candidate beams, transmission of a BFR request, and monitoring of the response from the network device to the BFR request. In NR, the network device can include multiple transmission and reception points or antenna panels. However, in the conventional BFR mechanism, even if all the BFR RSs of one TRP fail, in some cases, the BFR procedure may not be triggered, which causes an increase in delay and a decrease in network performance.

Summary of the Invention

Problems to be Solved by the Invention

[0004] Overall, the exemplary embodiments of the present disclosure provide a communication method, a communication device, and a computer-readable medium for BFR.

Means for Solving the Problems

[0005] In a first aspect, a communication method is provided. The method includes determining, at a terminal device, a link quality of reference signals in a first set and a second set of reference signals for link failure detection received from a network device, wherein the first set of reference signals is associated with a first control resource set and the second set of reference signals is associated with a second control resource set; and transmitting, to the network device, signaling for link recovery according to a determination that the link quality of each reference signal in the first set is lower than a first threshold quality, wherein the signaling includes a first indication regarding the first control resource set.

[0006] In a second aspect, a communication method is provided. The method includes receiving, at a network device, from a terminal device, signaling for link recovery that includes a first indication regarding a first control resource set associated with a first set of reference signals for link failure detection; and performing a link recovery procedure for the first control resource set.

[0007] In a third aspect, a terminal device is provided. The terminal device includes a processor and a memory coupled to the processor. The memory stores instructions that, when executed by the processor, cause the terminal device to perform the method according to the first aspect of the present disclosure.

[0008] In a fourth aspect, a network device is provided. The network device includes a processor and a memory coupled to the processor. The memory stores instructions that, when executed by the processor, cause the network device to perform the method according to the second aspect of the present disclosure.

[0009] In a fifth aspect, a computer-readable medium storing instructions is provided. When the instructions are executed on at least one processor, the at least one processor is caused to execute the method according to the first aspect of the present disclosure.

[0010] In a sixth aspect, a computer-readable medium storing instructions is provided. When the instructions are executed on at least one processor, the at least one processor is caused to execute the method according to the second aspect of the present disclosure.

[0011] Other features of the present disclosure should be easily understood from the following description.

Brief Description of the Drawings

[0012] Some embodiments of the present disclosure will be described in more detail with reference to the drawings, so that the above-mentioned and other objects, features, and advantages of the present disclosure will become more apparent.

[0013]

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Embodiments for Carrying Out the Invention

[0014] Here, the principles of the present disclosure will be described with reference to some exemplary embodiments. It should be understood that these embodiments are described for illustrative purposes only and are intended to assist those skilled in the art in understanding and implementing the present disclosure, without suggesting any limitation on the scope of the present disclosure. The disclosure described in the text can be implemented in various ways different from the methods described below.

[0015] In the following description and claims, unless otherwise defined, all technical and scientific terms used in the text have the same meaning as commonly understood by one of ordinary skill in the art of the present disclosure.

[0016] As used herein, the term "terminal device" means any device having wireless or wired communication capabilities. Examples of terminal devices include, but are not limited to, user equipment (UE), personal computers, desktop computers, mobile phones, cellular phones, smartphones, personal digital assistants (PDAs), portable computers, tablets, wearable devices, Internet of Things (IoT) devices, any Internet of Everything (IoE) device, machine type communication (MTC) devices, in-vehicle devices for vehicle-to-everything (V2X) communication, etc. Here, "X" in V2X represents a pedestrian, a vehicle, or an infrastructure / network, or an image acquisition device such as a digital camera, a game device, a music storage and playback device, or an Internet appliance that enables wireless or wired Internet access and browsing. The term "terminal device" can be used interchangeably with UE, mobile station, subscriber station, mobile terminal, user terminal, or wireless device. Also, the term "network device" means a device that can provide or host a cell or coverage with which a terminal device can communicate. Examples of network devices include, but are not limited to, Node B (NodeB or NB), evolved Node B (eNodeB or eNB), next-generation Node B (gNB), transmission and reception point (TRP), remote radio unit (RRU), radio head (RH), remote radio head (RRH), femto node, pico node, and other low-power nodes.

[0017] As used herein, the term "network device" or "base station" (BS) means a device that can provide or host a cell or coverage with which a terminal device can communicate. Examples of network devices include, but are not limited to, Node B (NodeB or NB), evolved Node B (eNodeB or eNB), next-generation Node B (gNB), remote radio unit (RRU), radio head (RH), remote radio head (RRH), femto node, pico node, and other low-power nodes.

[0018] As used herein, the term "TRP" means an antenna array (having one or more antenna elements) that is available to a network device located at a particular geographical location. For example, a network device may be coupled to multiple TRPs at different geographical locations to achieve better coverage.

[0019] In one embodiment, a terminal device can be connected to a first network device and a second network device. One of the first network device and the second network device may be a master node and the other may be a secondary node. The first network device and the second network device may utilize different RATs. In one embodiment, the first network device may be a first RAT device and the second network device may be a second RAT device. In one embodiment, the first RAT device is an eNB and the second RAT device is a gNB. Information regarding different RATs can be transmitted from at least one of the first network device and the second network device to the terminal device. In one embodiment, the first information may be transmitted from the first network device to the terminal device, and the second information may be transmitted from the second network device directly or via the first network device to the terminal device. In one embodiment, information regarding the settings of the terminal device set by the second network device can be transmitted from the second network device via the first network device. Information regarding the re - settings of the terminal device set by the second network device can be transmitted from the second network device directly or via the first network device to the terminal device.

[0020] As used herein, the singular forms "a", "an", and "the" include the plural forms as well, unless the context clearly dictates otherwise. The term "comprising" and variations thereof are to be understood as an open-ended term meaning "including, but not limited to". The term "based on" is to be understood as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be understood as "at least one embodiment". The term "another embodiment" is to be understood as "at least one another embodiment". The terms "first", "second", etc. can refer to different or the same objects. The terms "BFR", "LRR", "beam failure recovery", "link recovery", "BFRQ", "beam failure recovery request", "link recovery request" can be used interchangeably. Other explicit and implicit definitions may be included below.

[0021] In some examples, values, procedures, or devices are referred to as "best", "lowest", "highest", "minimum", "maximum", etc. Such descriptions are intended to indicate that a selection can be made from among many available functional alternatives, and it should be understood that such a selection need not be better, smaller, higher, or otherwise more preferred than other selections.

[0022] In a conventional BFR procedure, a terminal device can monitor a BFD reference signal (RS) to evaluate whether a beam failure has occurred. If all RSs fail, the terminal device can monitor beam identification information RS to find a new candidate beam. Once the candidate beam is identified, the terminal device can send BFR signaling to the network device that holds information about the identified candidate beam. The terminal device can monitor a control channel search space to detect a response from the network device to the BFR signaling. When the terminal device receives a beam recovery confirmation response from the network device, a new beam pair can be considered established and the beam failure can be considered recovered.

[0023] However, even if all the BFD RSs of one TRP fail, the BFR procedure may not be triggered due to other properly connected BFD RSs of other TRPs. This causes an increase in delay and a degradation of network performance.

[0024] In view of this, embodiments of the present disclosure provide a solution for BFR for each TRP, also referred to as partial BFR based on multi-TRP. In this solution, when all the BFD RSs of one TRP fail, the BFR procedure is triggered. In one aspect, embodiments of the present disclosure provide a procedure for BFR for each TRP. In another aspect, embodiments of the present disclosure provide a solution for BFD RS setting and candidate beam RS setting for BFR for each TRP. In still another aspect, embodiments of the present disclosure provide a solution for a combination of a partial BFR procedure and a normal BFR procedure. Thus, BFR can be executed for each TRP, thereby avoiding an increase in delay and improving network performance. Hereinafter, the principles and embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0025] FIG. 1 shows an exemplary communication network 100 in which embodiments of the present disclosure can be implemented. As shown in FIG. 1, network 100 includes a network device 110 coupled to two TRPs / panels 120-1 and 120-2 (collectively referred to as TRP 120 or individually as TRP 120). Network 100 further includes a terminal device 130 served by network device 110. It should be understood that the numbers of network devices, terminal devices, and TRPs shown in FIG. 1 are for illustrative purposes only and do not imply any limitation. Network 200 can include any suitable number of devices and TRPs suitable for implementing embodiments of the present disclosure.

[0026] As shown in FIG. 1, the network device 110 can communicate with the terminal device 130 via the TRPs 120-1 and 120-2. In the following text, the TRP 120-1 can also be referred to as the first TRP, and the TRP 120-2 can also be referred to as the second TRP. Each of the TRPs 120 can provide a plurality of beams for communicating with the terminal device 130. For example, the TRP 120-1 can include four beams 121-1, 121-2, 121-3, and 121-4 (collectively referred to as "beam 121" or individually referred to as "beam 121"), while the TRP 120-2 can also include four beams 122-1, 122-2, 122-3, and 122-4 (collectively referred to as beam 122 or individually referred to as beam 122). It should be understood that the number of beams shown in FIG. 1 is provided for illustrative purposes only and does not imply any limitation. The TRP 120 can provide any suitable number of beams suitable for implementing the embodiments of the present disclosure.

[0027] Communication in the network 100 can comply with any suitable standard including, but not limited to, New Radio Access (NR), Long Term Evolution (LTE), LTE-Evolution, LTE-Advanced (LTE-A), Wideband Code Division Multiple Access (WCDMA), Code Division Multiple Access (CDMA), and Global System for Mobile Communications (GSM) for mobile communications. Further, the communication can be performed according to any generation of communication protocol known currently or developed in the future. Examples of communication protocols include, but are not limited to, the first generation (1G), second generation (2G), 2.5G, 2.75G, third generation (3G), fourth generation (4G), 4.5G, and fifth generation (5G) communication protocols.

[0028] In some embodiments, due to inaccurate beam adjustment, occlusion effects, movement of the terminal device, or some other reason, if the network device 110 cannot reach the terminal device 130 via the downlink control channel (e.g., PDCCH), a beam failure may occur. For example, the terminal device 130 can detect this situation by estimating the quality of the hypothetical PDCCH reception transmitted on the beam (e.g., the beam from TRP 120-1 or 120-2) that the network device 110 uses to reach the terminal device 130. To perform BFD, the terminal device 130 can estimate the quality of the hypothetical PDCCH reception based on the reception of a certain reference signal (RS). In the following text, this reference signal can also be referred to as "BFD RS" or "RS for BFD". Examples of BFD RS can include, but are not limited to, periodic channel state information reference signals (CSI-RS), synchronization signal / physical broadcast channel blocks (SS / PBCH blocks), or combinations thereof.

[0029] In some embodiments, if the quality of the hypothetical PDCCH reception of the beam is worse than a threshold, the terminal device 130 can determine that the beam has failed. In some embodiments, the terminal device 130 can detect that all the beams of one TRP have failed, but the other beams of other TRPs are still well-connected. FIG. 2 shows an exemplary scenario 200 of multi-TRP transmission according to some embodiments of the present disclosure. For the sake of convenience, it will be described in relation to the example of FIG. 1. As shown in FIG. 2, the terminal device 130 can detect that all the beams 122 of TRP 120-2 and the beam 121-4 of TRP 120-1 have failed, but the beams 121-1, 121-2, and 121-3 are still well-connected. In this case, the BFR procedure is not triggered by the conventional solution. However, according to the embodiments of the present disclosure, the terminal device 130 triggers the BFR procedure for TRP 120-2. The BFR procedure for each TRP will be described in more detail with reference to FIG. 3.

[0030] FIG. 3 is a schematic diagram showing a communication process 300 during BFR according to an embodiment of the present disclosure. For the sake of explanation, process 300 will be described with reference to FIG. 1. Network device 110 and terminal device 130 as shown in FIG. 1 may be involved in process 300.

[0031] As shown in FIG. 3, network device 110 can transmit (301) resource configuration information associated with BFR for each TRP. In some embodiments, network device 110 can transmit resource configuration information via RRC upper layer signaling. Of course, any other suitable method is also possible.

[0032] In some embodiments, network device 110 can configure at least one control resource set (CORESET) for terminal device 130. In some embodiments, network device 110 can transmit R CORESETs to terminal device 130, where R is a positive integer. For example, 1≤R≤5. For example, the R CORESETs can be configured for an active bandwidth part (BWP). For example, the R CORESETs can be configured for a cell. In some embodiments, each CORESET can be configured to have a parameter such as CORESETPoolIndex. In some embodiments, at least one CORESET can be configured to have a parameter such as CORESETPoolIndex. In some embodiments, there may be S CORESETs that are not configured to have a parameter such as CORESETPoolIndex, where S is an integer. For example, 0≤S≤5. In some embodiments, CORESETPoolIndex may have N different values, where 1≤N≤4. For example, N = 2. In this case, CORESETPoolIndex can have the value 0 or 1. Of course, any other suitable value is also possible.

[0033] In some embodiments, there may be T CORESETs within the R CORESETs, where T is an integer. For example, 0 ≤ T ≤ 5. For the T CORESETs, the terminal device 130 may not be provided with a CORESETPoolIndex, or the terminal device 130 may be provided with a CORESETPoolIndex having a value of 0. For example, the T CORESETs can be assumed to be the first set of CORESETs (represented as C1). For example, C1 is associated with the TRP 120-1. For the R-T CORESETs, the terminal device 130 can be provided with a CORESETPoolIndex having a value of 1. For example, the R-T CORESETs can be assumed to be the second set of CORESETs (represented as C2). For example, C2 is associated with the TRP 120-2.

[0034] In some embodiments, the network device 110 can set M sets of BFD RSs and L sets of candidate beam RSs for the terminal device 130. For example, M is an integer and 0 ≤ M ≤ N. For example, L is an integer and 0 ≤ L ≤ N. In some embodiments, L = M. In some embodiments, M ≤ L. Of course, the present application is not limited thereto, and any other suitable embodiments are also possible. In some embodiments, each set of BFD RSs is associated with a CORESET set such that each has the same value of CORESETPoolIndex, and each set of candidate beam RSs is also associated with a CORESET set such that each has the same value of CORESETPoolIndex. In some embodiments, each set of BFD RSs is associated with either the first set C1 of CORESETs or the second set C2 of CORESETs. In some embodiments, each set of candidate beam RSs is associated with either the first set C1 of CORESETs or the second set C2 of CORESETs.

[0035] For example, the network device 110 is a set of BFD RSs

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[0036] In some alternative embodiments, the network device 110 may not set the BFD RS for the terminal device 130. In some alternative embodiments, the network device 110 may set only one set of BFD RS (e.g.,

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[0037] In some alternative embodiments, the network device 110 can set only one set of candidate beams RS (e.g.,

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[0038] In some embodiments, the set

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[0039] In some embodiments, the set

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[0040] Referring to FIG. 3, the terminal device 130 determines (302) whether a link failure has occurred for at least one of the set

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[0041] In some embodiments where the BFD RS set is not configured, for example, the set

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[0042] In some embodiments where a set of BFD RS is not configured, for example, the set

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[0043] In some alternative embodiments, the terminal device 130 determines a set of RS based on C1 and C2,

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[0044] In some embodiments, the set

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[0045] only one set [Number] is set (e.g., set [Number] is set but set [Number] is not set, or vice versa) In some embodiments, e.g., set [Number] None of the RSs within are QCLed (e.g., QCL type D) with the RSs within the RS set indicated / updated by the TCI state for a CORESET (configured to have CORESETPoolIndex = 1, e.g., C2). For example, the terminal device 130 may determine another set or subset of BFD RSs associated with C2

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[0046] For example, the terminal device 130 may set a set

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[0047] As another example, the terminal device 130 is set to include a periodic CSI-RS resource setting index having the same value as the RS index in the RS set indicated / updated by the TCI state for each CORESET (e.g., C2) used by the terminal device 130 to monitor the PDCCH and configured to have CORESETPoolIndex = 1

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[0048] Set

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[0049] In some embodiments, the terminal device 130 can determine whether the link quality of each of the RSs within the set

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[0050] In some embodiments, the threshold values Q out,LR and Q out,LR_1Any of them can be set to a predetermined value. For example, the threshold Q out,LR may be the same as or different from Q out,LR_1 . For example, for the first set (C1) of CORESETs on the active DL BWP of the serving cell, when the CORESETPoolIndex is not provided to the terminal device 130 or a CORESETPoolIndex having a value of 0 is provided, and for the second set (C2) of CORESETs on the active DL BWP of the serving cell, when a CORESETPoolIndex having a value of 1 is provided to the terminal device 130, and / or when the terminal device 130 is set to have multi-TRP / partial beam failure recovery, the threshold Q out,LR may correspond to the default value of rlmInSyncOutOfSyncThreshold as described in [10, TS 38.133] for Q out . For example, the threshold Q out,LR_1 may also correspond to the default value of rlmInSyncOutOfSyncThreshold as described in [10, TS 38.133] for Q out . For another example, the threshold Q out,LR_1 may correspond to a different default value of rlmInSyncOutOfSyncThreshold - 1 as described in [10, TS 38.133] for Q out_1 .

[0051] In some alternative embodiments, either the threshold Q out,LR or Q out,LR_1 may be set. For example, an offset (e.g., Q out,LR_offset ) can be set for the terminal device 130, and the threshold Q out,LR_1 = Q out,LR + Q out,LR_offset can be applied to C2. Note that the thresholds Q out,LR and Q out,LR_1 can be any other appropriate values. Also, the thresholds Q out,LR and Q out,LR_1 may be different or the same values.

[0052] set [Number] and [Number] If it is determined that a link failure has occurred for one of them, the terminal device 130 transmits (303) BFR signaling to the network device 110. For example, the BFR signaling may be signaling for link recovery (also referred to as BFR signaling). For another example, the signaling may be set [Number] and [Number] It can include an instruction regarding at least one of C1 and C2 associated with at least one of them. For example, in this way, the BFR procedure can be triggered for each TRP or for each set of CORESETs.

[0053] set [Number] In some embodiments where a link failure occurs for, for example, for the first set C1 of CORESETs. For another example, for TRP 120-1. In these embodiments, the terminal device 130 set [Number] from a subset of RS (also referred to as at least one first RS, herein [Number] determine (expressed as), and can transmit BFR signaling including an instruction regarding C1 and information regarding the determined subset.

[0054] set

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[0055] set

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[0056] In some embodiments where only a plurality of RSs for link recovery are set, the terminal device 130 sets a first portion associated with C1 among the plurality of RSs [Number] and determines it as such, and sets a second portion associated with C2 among the plurality of RSs [Number] can be determined. In some embodiments, the terminal device 130 sets a first portion among the plurality of RSs that is set to have a first value of parameter Y [Number] and determines it as such, and sets a second portion among the plurality of RSs that is set to have a second value of parameter Y [Number] can be determined. The first value and the second value can be any appropriate values, such as 0 or 1, for example. In some embodiments, the terminal device 130 sets a first portion among the plurality of RSs that is not set to have parameter Y [Number] and determines it as such, and sets a second portion among the plurality of RSs that is set to have parameter Y [Number] can be determined as. In some embodiments, the terminal device 130 sets a first portion of the plurality of RSs that is not set to have parameter Y or is set to have a first value of parameter Y

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[0057] In some embodiments, when a link failure occurs for at least one set or subset of BFD RSs, the terminal device 130 sends to the upper layer an indication or index regarding the associated set of CORESETs corresponding to the set / subset of BFD RSs, an indication or index regarding the set / subset of BFD RSs, and a corresponding Layer-1 reference signal received power (L1-RSRP) measurement value that is greater than or equal to the corresponding threshold (Q in,LR or Q in,LR_1 ) for a new beam candidate, and a corresponding set of RSs (i.e., the corresponding

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[0058] set

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[0059] In some embodiments, the set

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[0060] For example, two sets

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[0061] In some embodiments, the terminal device 130 has a radio link quality of Q out,LRA parameter V (e.g., an index or an index having a value 0, for example) for a set of corresponding CORESETs (C1) with worse handling, and for the set of corresponding CORESETs (C1)

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[0062] For example, the parameter V is for a set / subset of newly identified RSs (e.g.,

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[0063] In some alternative embodiments, the parameter V may not need to be explicitly reported. For example, if the reported index of the CSI-RS and / or SS / PBCH block is in the set

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[0064] Set

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[0065] or subset S

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[0066] For example, two sets

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[0067] In some embodiments, the terminal device 130 may transmit at least one of a parameter V (e.g., one or more indices) for a corresponding set of CORESETs (C2) with a wireless link quality worse than Q out,LR or Q out,LR_1 , an indication of the existence of

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[0068] For example, the parameter V may be a set / subset for the newly identified RS (e.g.,

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[0069] In some alternative embodiments, the parameter V may not need to be explicitly reported. For example, if the reported indexes of CSI-RS and / or SS / PBCH blocks are in the set

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[0070] Upon receiving the BFR signaling, the network device 110 executes (304) a link recovery procedure for the TRP or for a set of CORESETs. Set

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[0071] The terminal device 130 monitors (305) the downlink control channel within at least one of the sets C1 and C2. When the terminal device 130 receives a response to the BFR signaling via the downlink control channel, the beam failure is recovered.

[0072] Set

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[0073] In some embodiments, the terminal device 130 uses the same spatial region filter corresponding to that for periodic CSI-RS or SS / PBCH block reception, and

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[0074] set

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[0075] In some embodiments, the terminal device 130 uses the same spatial region filter corresponding to that for periodic CSI-RS or SS / PBCH block reception, and

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[0076] In some embodiments, the terminal device 130 is a set

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[0077] In some embodiments, the terminal device 130 is a set

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[0078] For example, two sets

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[0079] In some embodiments, A and / or B and / or C are non - negative integers. For example, A may be any one of {0, 1, 2}. For another example, A = 0. For example, B may be any one of {0, 1, 2}. For another example, B = 1. For example, C may be any one of {0, 1, 2}. For another example, C = 2. For another example, the value of A may be different from the value of H. For another example, the value of A may be different from the value of C. For another example, the value of A may be different from the value of C. In some embodiments, F and / or G and / or H are non - negative integers. For example, F may be any one of {0, 1, 2}. For another example, F = 0. For example, G may be any one of {0, 1, 2}. For another example, G = 1. For example, H may be any one of {0, 1, 2}. For another example, H = 2. For another example, the value of F may be different from the value of G. For another example, the value of F may be different from the value of H. For another example, the value of G may be different from the value of H.

[0080] In some embodiments, two sets [Number] and

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[0081] In some embodiments, the terminal device 130 has a parameter V (e.g., an index or an index having a value 2 or a value 0) for a corresponding set of CORESETs (C1) with a wireless link quality worse than Q out,LR and an indication of the presence of

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[0082] In some embodiments, the parameter V is a set

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[0083] In some embodiments,

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[0084] In some embodiments,

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[0085] In some embodiments,

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[0086] In some alternative embodiments,

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[0087] In some embodiments,

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[0088] In some embodiments

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[0089] In some alternative embodiments, the terminal device 130 has a larger L1-RSRP for periodic CSI-RS or SS / PBCH block reception [Number] or [Number] Use the same spatial region filter as that corresponding to, and has a larger L1-RSRP [Number] ,

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[0090] In some embodiments, the terminal device 130, for link recovery (i.e., new beam candidates), the set

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[0091] and may provide the periodic CSI-RS configuration index and / or SS / PBCH block index from the set in,LR and the corresponding L1-RSRP measurement value greater than or equal to the threshold Q

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[0092] In some embodiments,

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[0093] In some embodiments, for the Pcell or PScell, upon request from the upper layer, the terminal device 130 can (a set corresponding to the larger L1-RSRP)

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[0094] In some embodiments, for the Scell, (

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[0095] In some embodiments, for the Scell, ( [Number] and [Number] both sets or the subset S of and 1_0 and S 1_1 ​When RS is satisfied in both subsets with it), upon request from the upper layer, the terminal device 130 provides the upper layer with the corresponding L1-RSRP measurement value that is greater than or equal to Q in,LR A set with a larger L1-RSRP value that is greater than or equal to the threshold

Number

Number

Number

Number

[0096] In some embodiments

Number

Number

[0097] In some embodiments, the terminal device 130 can report the ability regarding whether partial BFR is supported.

Number

Number

Number

Number

Number

Number

[0098] In some embodiments, the terminal device 130 can report the ability regarding whether partial BFR is supported.

[0099] Returning to FIG. 3, the set [Number] or subset S 0_0 In some embodiments where a link failure occurs for the set [Number] or subset S 0_1 if the link quality of each RS within is lower than Q out,LR_1 and it is determined (308) that the downlink control information for set C1 has been received via the downlink control channel, the terminal device 130 can send (309) another signaling for link recovery to the network device 110, including a third indication regarding set C2. Thus, the link recovery procedure is triggered individually for another TRP or for another set of CORESETs. Of course, any other suitable method for determining a link failure is also possible.

[0100] For example, (the set [Number] or subset S 0_0 ) or (the set [Number] or subset S 0_1 if the radio link quality for all corresponding resource settings within either one (e.g., J1) of (the set out,LR or threshold Q out,LR_1 is worse, a partial BFR (as disclosed in some embodiments) is processed, and before the terminal device 130 monitors the corresponding PDCCH, (the set [Number] or subset S 1_0 ) or (the set [Number] or subset S 1_1 ) for all corresponding resource settings within the other one (e.g., J1) of them, the radio link quality is lower than threshold Q out,LR or threshold Q out,LR_1 is worse, and if the terminal device 130 successfully receives the PDCCH (before a timing that is predetermined or can be set via at least one of RRC, MAC CE, and DCI), the terminal device 130 applies partial BFR for J2 (as disclosed in some embodiments). In some embodiments, if the terminal device 130 does not successfully receive the PDCCH (before a timing that is predetermined or reported / decided as the capability of the terminal device 130, or reported / decided as the capability of the terminal device 130, or can be set via at least one of RRC, MAC CE, and DCI), the terminal device 130 applies normal BFR (e.g., the current specification procedure disclosed in Article 6 of TS 38.213 v16.2.0) for the BWP / cell.

[0101] In some embodiments, for a BWP / cell configured to have two sets of CORESETs C1 and C2, BFR or LRR can be applied in the order of partial BFR (as disclosed in some embodiments), then normal BFR or LRR (e.g., the current specification procedure disclosed in Article 6 of TS 38.213 v16.2.0). In some embodiments, for the Pcell and Pscell, (the set

Number

Number

Number

Number

[0102] Using the process of FIG. 3, procedures for BFR for each TRP or for each set of CORESETs are provided. An increase in delay can be avoided and efficiency can be improved. Accordingly, embodiments of the present disclosure also provide a communication method and apparatus for BFR. This will be described below in connection with FIGS. 4 to 6.

[0103] FIG. 4 is a flowchart illustrating an exemplary method 400 for BFR implemented in a terminal device according to some embodiments of the present disclosure. The method 400 can be implemented in the terminal device 130 as shown in FIG. 1. For the sake of explanation, the method 400 will be described with reference to FIG. 1. The method 400 can include additional operations not shown and / or can omit some of the operations shown, and it should be understood that the scope of the present disclosure is not limited in this regard.

[0104] In block 410, the terminal device 130 determines the link quality of the RSs in the first set and the second set of RSs received from the network device 110 for link failure detection. In some embodiments, the first set of RSs is associated with a first CORESET (e.g., C1), and the second set of RSs is associated with a second CORESET (e.g., C2). In some embodiments, each RS in the first set of RSs may be set to have a first value of the CORESETPoolIndex, and each RS in the second set of RSs may be set to have a second value of the CORESETPoolIndex. In some embodiments, the first CORESET is associated with a first TRP (e.g., TRP 120-1) of the network device 110, and the second CORESET is associated with a second TRP (e.g., TRP 120-2) of the network device 110. In these embodiments, the first set and the second set of RSs are BFD RSs. Thus, the terminal device 130 can perform BFD for each TRP.

[0105] In some embodiments, the terminal device 130 is the first set and the second set (e.g.,

Number

Number

[0106] In some embodiments, the terminal device 130 receives information regarding a plurality of RSs for link failure detection from the network device 110, determines a first portion of the plurality of RSs as the first set, the first portion is associated with the first CORESET, and determines a second portion of the plurality of RSs as the second set, the second portion is associated with the second CORESET. In some embodiments, the first portion may be set to have a first value of a parameter associated with the first CORESET, and the second portion may be set to have a second value of a parameter associated with the second CORESET.

[0107] In some embodiments, the RSs in the first set may be different from the RSs in the second set. In some embodiments, the RSs in the first set may not be QCLed (e.g., QCL type D) with the RSs in the second set.

[0108] In some embodiments, the terminal device 130 can determine the first set based on the configuration parameters for the first CORESET and determine the second set based on the configuration parameters for the second CORESET. In some embodiments, this configuration parameter may be a TCI state. Of course, any other suitable parameter is also possible.

[0109] In some embodiments, the terminal device 130 determines a plurality of RSs based on the configuration parameters for the first CORESET and the second CORESET, determines a first portion associated with the first CORESET within the plurality of RSs as the first set, and determines a second portion associated with the second CORESET within the plurality of RSs as the second set. In some embodiments, this configuration parameter may be a TCI state. Of course, any other suitable parameters are also possible.

[0110] In some embodiments, the terminal device 130 receives information regarding the first set from the network device 110 and can determine the first set from the RSs received from the network device 110 based on this information. In these embodiments, the terminal device 130 can determine the second set from the received RSs based on the configuration parameters for the second CORESET. In some embodiments, this configuration parameter may be a TCI state. Of course, any other suitable parameters are also possible.

[0111] In block 420, the terminal device 130 can determine whether the link quality of each RS within the first set is lower than a first threshold quality (e.g., Q out,LR ). If it is determined that the link quality of each RS within the first set is lower than the first threshold quality, that is, if a link failure occurs at the first TRP, the process proceeds to block 430. In block 430, the terminal device 130 can send signaling for link recovery to the network device 110 that includes a first indication regarding the first CORESET. Thereby, the link failure at the first TRP is notified to the network side, and a link recovery procedure can be triggered for each TRP. This will be described in more detail in relation to FIG. 5.

[0112] FIG. 5 is a flowchart showing another exemplary method 500 for BFR implemented in a terminal device according to some embodiments of the present disclosure. The method 500 can be implemented in the terminal device 130 as shown in FIG. 1. For the sake of explanation, the method 500 will be described with reference to FIG. 1. The method 500 can include additional operations not shown and / or can omit some of the operations shown, and it should be understood that the scope of the present disclosure is not limited in this regard. In the present embodiment, a link failure has occurred for the first CORESET (for example, the first TRP).

[0113] As shown in FIG. 5, at block 510, the terminal device 130 determines whether a third set of RSs (for example,

Number

Number

[0114] In some embodiments, the terminal device 130 receives information regarding a plurality of RSs for link recovery from the network device 110, determines a first portion associated with the first CORESET within the plurality of RSs as the third set, and determines a second portion associated with the second CORESET within the plurality of RSs as a fourth set of RSs (for example,

Number

[0115] In some embodiments, the terminal device 130 can receive information regarding the third and fourth sets from the network device 110, and based on the received information, determine the third and fourth sets from the RS received from the network device 110. In some embodiments, the terminal device 130 can receive information by means of upper layer parameters such as candidateBeamRSList or candidateBeamRSListExt-r16 or candidateBeamRSList-r16 for wireless link quality measurement. Of course, this is just an example, and any other appropriate method is also possible.

[0116] In some embodiments, the RSs in the third set may be different from the RSs in the fourth set. In some embodiments, the RSs in the third set may not be QCLed (e.g., QCL type D) with the RSs in the fourth set.

[0117] In block 510, if it is determined that the third set includes the first RS, the process proceeds to block 520. In block 520, the terminal device 130 can transmit signaling for link recovery, including a first indication regarding the first CORESET, a second indication regarding the presence of the first RS, and an index regarding the first RS. In some embodiments, the information regarding the first RS may be an index for periodic CSI-RS configuration. In an embodiment, the information regarding the first RS may be an index for SS / PBCH block.

[0118] If it is determined in block 510 that the third set does not include the first RS, in block 530, the terminal device 130 can transmit the first indication regarding the first CORESET and the second indication regarding the presence of the first RS in the signaling for link recovery.

[0119] In block 540, the terminal device 130 can monitor the downlink control channel from the network device 110 in one of the first CORESET and the second CORESET for link recovery of the first CORESET. In some embodiments, the terminal device 130 can monitor the downlink control channel in the first CORESET. For example, the terminal device 130 can monitor the downlink control channel in the first CORESET using the same antenna port quasi-collocation parameters associated with the first RS.

[0120] In some alternative embodiments, the terminal device 130 can monitor the downlink control channel in the second CORESET. For example, the terminal device 130 can monitor the downlink control channel in the second CORESET using the antenna port quasi-collocation parameters set or updated for the second CORESET. For example, the TCI state or QCL parameters for the first CORESET can be updated using the downlink control channel.

[0121] In block 550, the terminal device 130 can determine whether the link quality of each RS in the second set is lower than a second threshold quality (e.g., Q out,LR_1 ). If it is determined that the link quality of each RS in the second set is lower than the second threshold quality, that is, if a link failure also occurs at the second TRP, the process can proceed to block 560.

[0122] In block 560, the terminal device 130 can determine whether the downlink control information is received via the downlink control channel for the first TRP. In some embodiments, the terminal device 130 can determine whether the downlink control information is received within a timing. For example, the timing can be predetermined as a capability of the terminal device 130, determined by reporting, or set via at least one of RRC, MAC CE, and DCI. Of course, this is just an example, and any other appropriate method is also possible. If it is determined that the downlink control information is received, the process proceeds to block 570.

[0123] In block 570, the terminal device 130 can send another signaling for link recovery to the network device 110, including a third indication regarding the second CORESET. Thus, a separate BFR is also applied to the second TRP.

[0124] In some embodiments, the terminal device 130 can determine whether a fourth set of RSs for link recovery includes a second RS (e.g., in,LR_1 ) with a received power greater than or equal to a second threshold power (e.g., Q

Number

[0125] If it is determined in block 560 that the downlink control information has not been received normally, the process proceeds to block 580, where the terminal device 130 can apply the normal BFR to the BWP / cell. In some embodiments, the terminal device 130 sets

Number

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Number

[0126] In some embodiments, for a BWP / cell configured to have a first CORESET and a second CORESET, the BFR can be applied in the order of partial BFR and then normal BFR. In some embodiments, for the Pcell and the Pscell, if only one of the first set and the second set is faulty, the partial BFR can be applied; otherwise, the PRACH is applied for the normal BFR. In some embodiments, for one Scell, if only one of the first set and the second set is faulty, the partial BFR can be applied; otherwise, the normal BFR is applied. In some embodiments, if a first uplink control channel with partial BFR and a second uplink control channel with normal BFR overlap on one cell, the first uplink control channel can be discarded.

[0127] In some alternative embodiments, when it is determined that the link quality of the RSs in the first set is lower than the first threshold quality and the link quality of the RSs in the second set is lower than the second threshold quality, the terminal device 130 may send another signaling for link recovery including another instruction regarding the first CORESET and the second CORESET to the network device 110.

[0128] In these embodiments, the terminal device 130 may determine whether a third set of RSs for link recovery includes a first RS whose received power is greater than or equal to the first threshold power, and determine whether a fourth set of RSs for link recovery includes a second RS whose received power is greater than or equal to the second threshold power. When it is determined that the third set includes the first RS and the fourth set includes the second RS, the terminal device 130 may send, in the another signaling, the another instruction and information regarding at least one of the first RS and the second RS.

[0129] In some embodiments, the terminal device 130 may select one of the first RS and the second RS having a greater received power and send information regarding the selected one of the first RS and the second RS in the another signaling. In some embodiments, the terminal device 130 may also send information regarding the power difference of the other RS of the first RS and the second RS with respect to the selected RS. In some embodiments, the terminal device 130 may report to the network device 110 the ability regarding whether partial BFR is supported.

[0130] So far, the methods implemented in the terminal device have been described. Similarly, embodiments of the present disclosure also provide methods implemented in the network device. This will be described below with reference to FIG. 6.

[0131] FIG. 6 is a flowchart illustrating an exemplary method 600 for BFR implemented in a network device according to some embodiments of the present disclosure. The method 600 can be implemented in the network device 110 as shown in FIG. 1. For the sake of explanation, the method 600 will be described with reference to FIG. 1. The method 600 can include additional operations not shown and / or can omit some of the operations shown, and it should be understood that the scope of the present disclosure is not limited in this regard.

[0132] As shown in FIG. 6, at block 610, the network device 110 receives signaling from the terminal device 130 for link recovery. The signaling includes a first indication regarding a first CORESET (e.g., C1) associated with a first set of RSs (e.g.,

Number

[0133] In some embodiments, the network device 110 can also receive a second indication regarding the presence of a first RS (e.g.,

Number

Number

[0134] At block 620, the network device 110 executes a link recovery procedure for the first CORESET (i.e., the first TRP). In some embodiments, the network device 110 can transmit downlink control information associated with the first RS for link recovery.

[0135] In some embodiments, the network device 110 can transmit information regarding a first set of RSs and a second set of RSs (e.g.,

Number

[0136] In some embodiments, the network device 110 can transmit information regarding a set of RSs for link failure detection to the terminal device 130. In some embodiments, the network device 110 can transmit information regarding the first set to the terminal device 130.

[0137] In some embodiments, the network device 110 can transmit information regarding a third set of RSs and a fourth set of RSs (e.g.,

Number

[0138] In some embodiments, the network device 110 can further receive from the terminal device 130 another signaling for link recovery, including another indication regarding the first CORESET and the second CORESET. In some embodiments, the network device 110 receives, within the another signaling, information regarding at least one of a first RS (e.g.,

Number

Number

[0139] In some embodiments, the first CORESET is associated with a first TRP of the network device 110 , and the second CORESET is associated with a second TRP of the network device 110 .

[0140] Embodiments of the present disclosure provide a solution for BFR for each TRP. Embodiments of the present disclosure achieve a BFR that is faster than conventional beam recovery schemes.

[0141] FIG. 7 is a schematic block diagram of an apparatus 700 suitable for implementing an embodiment of the present disclosure. The apparatus 700 can be considered as another exemplary embodiment of the network apparatus 110 or the terminal apparatus 130 as shown in FIG. 1. Accordingly, the apparatus 700 can be implemented in the network apparatus 110 or the terminal apparatus 130, or as at least a part thereof.

[0142] As shown, the apparatus 700 includes a processor 710, a memory 720 coupled to the processor 710, a suitable transmitter (TX) and receiver (RX) 740 coupled to the processor 710, and a communication interface coupled to the TX / RX 740. The memory 720 stores at least a part of the program 730. The TX / RX 740 is used for two-way communication. The TX / RX 740 has at least one antenna to facilitate communication, although the access nodes referred to herein can actually have multiple antennas. The communication interface can represent any interface necessary for communication with other network elements, such as an X2 interface for two-way communication between eNBs, an S1 interface for communication between a mobility management entity (MME) / serving gateway (S-GW) and an eNB, a Un interface for communication between an eNB and a relay node (RN), or a Uu interface for communication between an eNB and a terminal apparatus.

[0143] Assume that program 730, when executed by an associated processor 710 as described in the text with reference to FIGS. 3 to 6, includes program instructions that enable device 700 to operate in accordance with embodiments of the present disclosure. Embodiments of the present text can be realized by computer software executable by processor 710 of device 700, or by hardware, or by a combination of software and hardware. Processor 710 can be configured to implement various embodiments of the present disclosure. Further, the combination of processor 710 and memory 720 can form processing means 750 suitable for realizing various embodiments of the present disclosure.

[0144] Memory 720 can be of any type suitable for a local technology network and can be realized using any suitable data storage technology, such as, by way of non-limiting example, a non-transitory computer-readable storage medium, a semiconductor-based memory device, a magnetic memory device and system, an optical memory device and system, a fixed memory, and a removable memory. Although only one memory 720 is shown within device 700, there may be several physically different memory modules within device 700. Processor 710 can be of any type suitable for a local technology network and can include, by way of non-limiting example, one or more of a general-purpose computer, a dedicated computer, a microprocessor, a digital signal processor (DSP), and a processor based on a multi-core processor architecture. Device 700 can have a plurality of processors, for example, an application-specific integrated circuit chip that is temporally dependent on a clock that synchronizes a main processor.

[0145] As a whole, various embodiments of the present disclosure can be implemented in hardware or dedicated circuits, software, logic, or any combination thereof. Some aspects may be implemented in hardware, and other aspects may be implemented in firmware or software executable by a controller, a microprocessor, or other computing device. Although various aspects of the embodiments of the present disclosure are illustrated and described using block diagrams, flowcharts, or other pictorial representations, the blocks, devices, systems, techniques, or methods described herein are, by way of non-limiting example, hardware, software, firmware, dedicated circuits or logic, general-purpose hardware or controllers or other computing devices, or any combination thereof.

[0146] The present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer-readable storage medium. The computer program product includes computer-executable instructions, such as instructions included in program modules, that are executed within a device on a target physical processor or virtual processor to perform the processes or methods described above with reference to FIGS. 3 to 6. Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, etc. that perform specific tasks or implement specific abstract data types. In various embodiments, the functions of program modules can be combined or divided among program modules as needed. The machine-executable instructions of program modules can be executed within a local or distributed device. In a distributed device, program modules may be located in both local and remote storage media.

[0147] The program code for executing the method of the present disclosure can be described in any combination of one or more programming languages. These program codes are provided to a processor or a controller of a general-purpose computer, a dedicated computer, or other programmable data processing devices, and when executed by the processor or the controller, the program codes implement the functions / operations specified in the flowchart and / or block diagram. The program code can be executed entirely on the machine, partially on the machine, as an independent software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0148] The above program code can be implemented on a machine-readable medium, and the machine-readable medium may be any tangible medium that can be used by or include or store a program related to an instruction execution system, apparatus, or device. The machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. The machine-readable medium can include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing media. More specific examples of machine-readable storage media can include electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable optical disc read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0149] Although the operations have been described in a particular order, it should be understood that in order to obtain the desired results, these operations need not be performed in the particular order shown or in a sequential order, or that all of the operations described must be performed. In some cases, multitasking or parallel processing may be advantageous. Similarly, although some specific implementation details are included in the above discussion, these should not be construed as limitations on the scope of the present disclosure, but rather as descriptions of features that may be specific to a particular embodiment. Some of the features described in the context of individual embodiments may be combined and implemented in a single embodiment. Conversely, various features described in the context of a single embodiment may be implemented separately in multiple embodiments or in any suitable subcombination.

[0150] Although the present disclosure has been described in language specific to structural features and / or methodological acts, it should be understood that the disclosure defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as illustrative forms of implementing the claims.

Claims

1. A method executed by a terminal device, comprising: determining, in a cell, two sets of reference signals (RS) for beam obstacle detection; transmitting beam obstacle recovery information to a network device; wherein, if beam obstacle is detected for only one of the two RS sets, the beam obstacle recovery information includes the index of the one RS set among the two RS sets, whether a reference signal whose received power is equal to or greater than a first threshold is included in one of two candidate RS sets for the one RS set among the two RS sets, and, if the reference signal is included in the one candidate RS set for the one RS set among the two RS sets, the index of the reference signal; if beam obstacle is detected for both of the two RS sets, the beam obstacle recovery information includes an indication associated with both of the two RS sets, whether a first reference signal whose received power is equal to or greater than the first threshold is included in a first candidate RS set of two candidate RS sets for a first RS set among the two RS sets, whether a second reference signal whose received power is equal to or greater than the first threshold is included in a second candidate RS set of two candidate RS sets for a second RS set among the two RS sets, the index of the first reference signal if the first reference signal is included in the first candidate RS set for the first RS set among the two RS sets, and the index of the second reference signal if the second reference signal is included in the second candidate RS set for the second RS set among the two RS sets; a method.

2. The reference signal included in the one candidate RS set of the two candidate RS sets is a channel state information reference signal (CSI-RS) or a synchronization signal / physical broadcast channel block (SS / PBCH block), the method according to claim 1.

3. The reference signals included in the two RS sets are channel state information reference signals (CSI-RS), the method according to claim 1.

4. A method executed by a network device, comprising: receiving beam obstacle recovery information from a terminal device; ​ ​ comprising in a cell, when a beam failure occurs in only one of two RS sets the beam failure recovery information includes an index of the one of the two RS sets, whether a reference signal whose received power is equal to or greater than a first threshold is included in one of two candidate RS sets for the one of the two RS sets, and an index of the reference signal when the reference signal is included in the one of the two candidate RS sets for the one of the two RS sets in the cell, when the beam failure occurs in both of the two RS sets the beam failure recovery information includes an instruction associated with both of the two RS sets, whether a first reference signal whose received power is equal to or greater than the first threshold is included in a first candidate RS set of the two candidate RS sets for a first RS set of the two RS sets, whether a second reference signal whose received power is equal to or greater than the first threshold is included in a second candidate RS set of the two candidate RS sets for a second RS set of the two RS sets, an index of the first reference signal when the first reference signal is included in the first candidate RS set for the first RS set of the two RS sets, and an index of the second reference signal when the second reference signal is included in the second candidate RS set for the second RS set of the two RS sets method

5. The reference signal included in the two candidate RS sets is a channel state information reference signal (CSI-RS) or a synchronization signal / physical broadcast channel block (SS / PBCH block). The method according to claim 4.

6. The reference signal included in the two RS sets is a channel state information reference signal (CSI-RS). The method according to claim 4.

7. Means for determining two reference signal (RS) sets for beam failure detection in a cell, and means for transmitting beam failure recovery information to a network device comprising when a beam failure is detected for only one of the two RS sets The beam failure recovery information includes the index of the one RS set out of the two RS sets, whether a reference signal whose received power is equal to or greater than a first threshold is included in one of the two candidate RS sets for the one RS set out of the two RS sets, and the index of the reference signal when the reference signal is included in the one candidate RS set for the one RS set out of the two RS sets. When the beam failure is detected for both of the two RS sets, the beam failure recovery information includes an instruction associated with both of the two RS sets, whether a first reference signal whose received power is equal to or greater than the first threshold is included in a first candidate RS set out of the two candidate RS sets for a first RS set out of the two RS sets, whether a second reference signal whose received power is equal to or greater than the first threshold is included in a second candidate RS set out of the two candidate RS sets for a second RS set out of the two RS sets, the index of the first reference signal when the first reference signal is included in the first candidate RS set for the first RS set out of the two RS sets, and the index of the second reference signal when the second reference signal is included in the second candidate RS set for the second RS set out of the two RS sets. Terminal device.

8. The reference signal included in the two candidate RS sets is a channel state information reference signal (CSI-RS) or a synchronization signal / physical broadcast channel block (SS / PBCH block). The terminal device according to claim 7.

9. The reference signal included in the two RS sets is a channel state information reference signal (CSI-RS). The terminal device according to claim 7.

10. Means for receiving beam failure recovery information from a terminal device, comprising In a cell, when a beam failure occurs only in one of the two RS sets, The beam failure recovery information includes the index of the one RS set out of the two RS sets, whether a reference signal whose received power is equal to or greater than a first threshold is included in one candidate RS set out of the two candidate RS sets for the one RS set out of the two RS sets, and the index of the reference signal when the reference signal is included in the one candidate RS set for the one RS set out of the two RS sets. When beam failure occurs in both of the two RS sets in the cell, The beam failure recovery information includes an instruction associated with both of the two RS sets, whether a first reference signal whose received power is equal to or greater than the first threshold is included in a first candidate RS set out of the two candidate RS sets for a first RS set out of the two RS sets, whether a second reference signal whose received power is equal to or greater than the first threshold is included in a second candidate RS set out of the two candidate RS sets for a second RS set out of the two RS sets, the index of the first reference signal when the first reference signal is included in the first candidate RS set for the first RS set out of the two RS sets, and the index of the second reference signal when the second reference signal is included in the second candidate RS set for the second RS set out of the two RS sets. Network device.

11. The reference signals included in the two candidate RS sets are channel state information reference signals (CSI-RS) or synchronization signal / physical broadcast channel blocks (SS / PBCH blocks). The network device according to claim 10.

12. The reference signals included in the two RS sets are channel state information reference signals (CSI-RS). The network device according to claim 10.

13. The link quality of each reference signal included in at least one of the two RS sets is less than a second threshold. The method according to claim 1.

14. The link quality of each reference signal included in at least one of the two RS sets is less than a second threshold. The terminal device according to claim 7.

15. The link quality of each reference signal included in at least one of the two RS sets is less than a second threshold value. The network device according to claim 10.

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