CN115589792A

CN115589792A - BFR (bidirectional Forwarding response) method for beam failure recovery, and sending method and device for aperiodic CSI-RS

Info

Publication number: CN115589792A
Application number: CN202180001173.3A
Authority: CN
Inventors: 罗星熠
Original assignee: Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing Xiaomi Mobile Software Co Ltd
Priority date: 2021-05-06
Filing date: 2021-05-06
Publication date: 2023-01-10
Also published as: WO2022233001A1

Abstract

The embodiment of the application discloses a BFR (bidirectional Forwarding response) method for beam failure recovery, a sending method and a sending device for aperiodic CSI-RS (channel state information-reference signal), which can be applied to a communication system, wherein the method comprises the following steps: receiving an aperiodic CSI-RS for beam failure detection in response to receiving a first downlink control message DCI of the network device, wherein the first DCI is used for triggering the terminal device to receive the aperiodic CSI-RS; in response to determining that a beam failure occurs based on the measurement of the aperiodic CSI-RS, a recovery procedure is initiated based on the selected target candidate beam. By implementing the embodiment of the application, the terminal equipment can receive the aperiodic CSI-RS for measurement in the time interval of the two first periodic CSI-RSs under the condition that the network equipment does not successfully send the first periodic CSI-RS, so that the aperiodic CSI-RS can be used for carrying out beam failure detection in time.

Description

BFR (bidirectional Forwarding response) method for beam failure recovery, and sending method and device for aperiodic CSI-RS

Technical Field

The present application relates to the field of communications technologies, and in particular, to a method for BFR recovery from beam failure, a method and an apparatus for sending aperiodic CSI-RS.

Background

A Beam Failure Recovery (BFR) process in the related art is divided into a Beam Failure detection, a candidate Beam selection, and a Recovery process. In the beam failure detection, the terminal device detects a current beam (beam) of the terminal device according to a Channel-state-information reference signal (CSI-RS) periodically transmitted by the network device. Since the channel detection needs to be performed by using a Listen Before Talk (LBT) mechanism in the unlicensed spectrum, and the reference signal can be transmitted only when the channel is determined to be idle, a periodic reference signal may not be transmitted, so that it is difficult to perform the current beam detection in time and find out the condition of beam failure in time.

Disclosure of Invention

The embodiment of the application provides a BFR (bidirectional Forwarding response) method for beam failure recovery, a sending method of an aperiodic CSI-RS (channel state information-reference signal) and a device, which can be applied to a communication system, and terminal equipment can timely detect beam failure by receiving the aperiodic CSI-RS.

In a first aspect, an embodiment of the present application provides a beam failure recovery BFR method, which is applied to a terminal device, and the method includes:

receiving an aperiodic CSI-RS for beam failure detection in response to receiving a first downlink control message DCI of a network device, wherein the first DCI is used for triggering the terminal device to receive the aperiodic CSI-RS;

initiating a recovery process according to the selected target candidate beam in response to determining that a beam failure occurs according to the measurement result of the aperiodic CSI-RS.

In the technical scheme, the terminal equipment can receive the aperiodic CSI-RS for measurement in the time interval of two first periodic CSI-RSs under the condition that the network equipment does not successfully send the first periodic CSI-RS, so that the aperiodic CSI-RS can be received in time, and beam failure detection can be performed in time.

In one possible implementation, the conditions for the occurrence of the beam failure are that the number of BFIs of the beam failure instances is greater than a first number threshold, and the number of non-BFIs between adjacent BFIs is less than or equal to a second number threshold;

the BFI indicates that the measurement result of the CSI-RS is smaller than a first measurement threshold value of the corresponding CSI-RS;

the non-BFI indicates that the measurement result of the CSI-RS is greater than or equal to a second measurement threshold value of the corresponding CSI-RS.

In one possible implementation manner, determining whether a beam failure occurs according to the measurement result of the aperiodic CSI-RS includes:

updating a historical beam failure example counting value BFI _ COUNTER and a historical non-beam failure example counting value nonBFI _ COUNTER according to the measurement result of the aperiodic CSI-RS to obtain a current BFI _ COUNTER and a current nonBFI _ COUNTER;

determining that a beam failure occurs in response to the current BFI _ COUNTER being greater than a first quantity threshold;

determining that no beam failure has occurred in response to the current BFI _ COUNTER being less than or equal to the first number threshold.

In a possible implementation manner, the updating, according to the measurement result of the aperiodic CSI-RS, the historical beam failure instance count value BFI _ COUNTER and the historical non-beam failure instance count value nonBFI _ COUNTER to obtain a current BFI _ COUNTER and a current nonBFI _ COUNTER includes:

responding to the fact that the measurement result of the aperiodic CSI-RS is smaller than a first measurement threshold of the aperiodic CSI-RS, adding 1 to the historical BFI _ COUNTER, and carrying out zero clearing on the historical nonBFI _ COUNTER to obtain the current BFI _ COUNTER and the current nonBFI _ COUNTER;

alternatively, the first and second electrodes may be,

responding to the fact that the measurement result of the aperiodic CSI-RS is larger than or equal to a second measurement threshold of the aperiodic CSI-RS, and adding 1 to the historical nonBFI _ COUNTER to obtain the current nonBFI _ COUNTER;

and responding to the situation that the current nonBFI _ COUNTER is larger than a second quantity threshold value, and carrying out zero clearing treatment on the historical BFI _ COUNTER to obtain the current nonBFI _ COUNTER.

In the technical scheme, the terminal device may receive the aperiodic CSI-RS for measurement in a time interval of two first periodic CSI-RSs under the condition that the network device does not successfully transmit the first periodic CSI-RS, and update the historical beam failure instance count value BFI _ COUNTER and the historical non-beam failure instance count value nonBFI _ COUNTER according to a measurement result of the aperiodic CSI-RS to obtain the current BFI _ COUNTER and the current non-BFI _ COUNTER, and further determine whether a beam failure occurs, thereby avoiding a situation that a beam failure detection is wrong when a certain first periodic CSI-RS is unsuccessfully transmitted in a manner of determining a beam failure by using the BFI _ COUNTER and a time threshold.

In one possible implementation, the selecting the target candidate beam includes:

receiving an aperiodic CSI-RS for candidate beam selection in response to receiving a second DCI for the network device;

selecting the target candidate beam according to a measurement result of the aperiodic CSI-RS for candidate beam selection.

In one possible implementation manner, before receiving the aperiodic CSI-RS for beam failure detection, the method further includes:

receiving Radio Resource Control (RRC) information of the network equipment, wherein the RRC information configures aperiodic CSI-RS used for beam failure detection and aperiodic CSI-RS used for candidate beam selection;

alternatively, the first and second electrodes may be,

receiving RRC information of the network equipment, wherein the RRC information configures aperiodic CSI-RS for candidate beam selection;

determining aperiodic CSI-RS used for beam failure detection according to the configured first aperiodic CSI-RS table; wherein the first aperiodic CSI-RS table stores information of a plurality of aperiodic CSI-RSs for beam failure detection.

In a second aspect, an embodiment of the present application provides a method for sending an aperiodic CSI-RS, which is applied to a network device, and the method includes:

in response to unsuccessful transmission of a first periodic CSI-RS caused by historical LBT failure and successful current LBT, transmitting a first downlink control message (DCI) to a terminal device, wherein the first DCI is used for triggering the terminal device to receive the aperiodic CSI-RS;

and sending the aperiodic CSI-RS for beam failure detection to the terminal equipment.

In the technical scheme, the network equipment can send the aperiodic CSI-RS within the time interval of two first periodic CSI-RSs under the condition that the first periodic CSI-RS is not sent successfully, so that the terminal equipment can receive the aperiodic CSI-RS in time and measure the aperiodic CSI-RS, and beam failure detection can be carried out in time.

In one possible implementation, the method further includes: responding to unsuccessful sending of a second period CSI-RS caused by historical LBT failure and successful current LBT, and sending a second DCI to the terminal equipment;

and sending the aperiodic CSI-RS for candidate beam selection to the terminal equipment.

In one possible implementation manner, before transmitting the aperiodic CSI-RS for beam failure detection to the terminal device, the method further includes:

transmitting Radio Resource Control (RRC) information to the terminal equipment, wherein the RRC information configures aperiodic CSI-RS used for beam failure detection and aperiodic CSI-RS used for candidate beam selection; alternatively, the first and second electrodes may be,

and sending RRC information to the terminal equipment, wherein the RRC information configures aperiodic CSI-RS used for candidate beam selection.

In a third aspect, an embodiment of the present application provides a communication apparatus, where the communication apparatus has a function of implementing part or all of the functions of the terminal device in the method according to the first aspect, for example, the function of the communication apparatus may have the functions in part or all of the embodiments in the present application, or may have the functions of implementing any one of the embodiments in the present application separately. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more units or modules corresponding to the above functions.

In one implementation, the communication device may include a transceiver unit and a processing unit in a structure, and the processing unit is configured to support the communication device to execute corresponding functions in the above method. The transceiver unit is used for supporting communication between the communication device and other equipment. The communication device may further comprise a memory unit for coupling with the transceiving unit and the processing unit, which saves computer programs and data necessary for the communication device.

As an example, the processing unit may be a processor, the transceiving unit may be a transceiver or a communication interface, and the storage unit may be a memory.

In a fourth aspect, the present invention provides another communication apparatus, where the communication apparatus has some or all of the functions of the network device in the method example described in the second aspect, for example, the functions of the communication apparatus may have the functions in some or all of the embodiments in the present application, or may have the functions of implementing any of the embodiments in the present application separately. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more units or modules corresponding to the above functions.

In one implementation, the communication device may include a transceiver unit and a processing unit in a structure, and the processing unit is configured to support the communication device to execute the corresponding functions in the method. The transceiver unit is used for supporting communication between the communication device and other equipment. The communication device may further comprise a memory unit for coupling with the transceiving unit and the processing unit, which saves computer programs and data necessary for the communication device.

In a fifth aspect, an embodiment of the present application provides a communication device, which includes a processor, and when the processor calls a computer program in a memory, the processor performs the method according to the first aspect.

In a sixth aspect, an embodiment of the present application provides a communication device, which includes a processor, and when the processor calls a computer program in a memory, the processor executes the method according to the second aspect.

In a seventh aspect, an embodiment of the present application provides a communication apparatus, including a processor and a memory, where the memory stores a computer program; the computer program, when executed by the processor, causes the communication apparatus to perform the method of the first aspect.

In an eighth aspect, an embodiment of the present application provides a communication apparatus, including a processor and a memory, where the memory stores a computer program; the computer program, when executed by the processor, causes the communication device to perform the method of the second aspect described above.

In a ninth aspect, embodiments of the present application provide a communication device, which includes a processor and an interface circuit, where the interface circuit is configured to receive code instructions and transmit the code instructions to the processor, and the processor is configured to execute the code instructions to cause the device to perform the method according to the first aspect.

In a tenth aspect, an embodiment of the present application provides a communication apparatus, which includes a processor and an interface circuit, where the interface circuit is configured to receive code instructions and transmit the code instructions to the processor, and the processor is configured to execute the code instructions to cause the apparatus to perform the method according to the second aspect.

In an eleventh aspect, the present invention provides a communication system, which includes the communication apparatus in the third aspect and the communication apparatus in the fourth aspect, or the system includes the communication apparatus in the fifth aspect and the communication apparatus in the sixth aspect, or the system includes the communication apparatus in the seventh aspect and the communication apparatus in the eighth aspect, or the system includes the communication apparatus in the ninth aspect and the communication apparatus in the tenth aspect.

In a twelfth aspect, an embodiment of the present invention provides a computer-readable storage medium for storing instructions, which when executed, implement the method according to the first aspect.

In a thirteenth aspect, the present invention provides a readable storage medium for storing instructions, which when executed, implement the method according to the second aspect.

In a fourteenth aspect, the present application also provides a computer program product comprising a computer program which, when run on a computer, causes the computer to perform the method of the first aspect described above.

In a fifteenth aspect, the present application also provides a computer program product comprising a computer program which, when run on a computer, causes the computer to perform the method of the second aspect described above.

In a sixteenth aspect, the present application provides a chip system, which includes at least one processor and an interface, and is configured to enable a terminal device to implement the functions according to the first aspect, for example, to determine or process at least one of data and information related to the method. In one possible design, the chip system further includes a memory for storing computer programs and data necessary for the terminal device. The chip system may be formed by a chip, or may include a chip and other discrete devices.

In a seventeenth aspect, the present application provides a chip system, which includes at least one processor and an interface, for enabling a network device to implement the functions related to the second aspect, for example, to determine or process at least one of data and information related to the method. In one possible design, the system-on-chip further includes a memory for storing computer programs and data necessary for the network device. The chip system may be formed by a chip, or may include a chip and other discrete devices.

In an eighteenth aspect, the present application provides a computer program which, when run on a computer, causes the computer to perform the method of the first aspect described above.

In a nineteenth aspect, the present application provides a computer program which, when run on a computer, causes the computer to perform the method of the second aspect described above.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the background art of the present application, the drawings required to be used in the embodiments or the background art of the present application will be described below.

Fig. 1 is a schematic architecture diagram of a communication system according to an embodiment of the present application;

fig. 2 is a flowchart illustrating a method for recovering BFR from beam failure according to an embodiment of the present application;

fig. 3 is a schematic flowchart of another BFR method for beam failure recovery according to an embodiment of the present application;

fig. 4 is a schematic flowchart of another BFR method for beam failure recovery according to an embodiment of the present application;

fig. 5 is a schematic flowchart of another BFR method for beam failure recovery according to an embodiment of the present application;

fig. 6 is a flowchart illustrating a method for transmitting an aperiodic CSI-RS according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of another communication device provided in an embodiment of the present application;

fig. 9 is a schematic structural diagram of a chip according to an embodiment of the present application.

Detailed Description

In order to better understand the BFR method for beam failure recovery, the sending method and the apparatus for aperiodic CSI-RS disclosed in the embodiments of the present application, a communication system to which the embodiments of the present application are applied is first described below.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a communication system according to an embodiment of the present disclosure. The communication system may include, but is not limited to, one network device and one terminal device, the number and form of the devices shown in fig. 1 are only for example and do not constitute a limitation to the embodiments of the present application, and two or more network devices and two or more terminal devices may be included in practical applications. The communication system shown in fig. 1 includes a network device 101 and a terminal device 102 as an example.

It should be noted that the technical solutions of the embodiments of the present application can be applied to various communication systems. For example: a Long Term Evolution (LTE) system, a fifth generation (5 th generation, 5G) mobile communication system, a 5G New Radio (NR) system, or other future new mobile communication systems.

The network device 101 in the embodiment of the present application is an entity for transmitting or receiving signals on the network side. For example, the network device 101 may be an evolved NodeB (eNB), a transmission point (TRP), a next generation base station (gNB) in an NR system, a base station in other future mobile communication systems, or an access node in a wireless fidelity (WiFi) system. The embodiments of the present application do not limit the specific technologies and the specific device forms used by the network devices. The network device provided by the embodiment of the present application may be composed of a Central Unit (CU) and a Distributed Unit (DU), where the CU may also be referred to as a control unit (control unit), and a protocol layer of a network device, such as a base station, may be split by using a structure of CU-DU, functions of a part of the protocol layer are placed in the CU for centralized control, and functions of the remaining part or all of the protocol layer are distributed in the DU, and the DU is centrally controlled by the CU.

The terminal device 102 in the embodiment of the present application is an entity, such as a mobile phone, on the user side for receiving or transmitting signals. A terminal device may also be referred to as a terminal device (terminal), a User Equipment (UE), a Mobile Station (MS), a mobile terminal device (MT), etc. The terminal device may be a vehicle having a communication function, a smart vehicle, a mobile phone (mobile phone), a wearable device, a tablet computer (Pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal device in industrial control (industrial control), a wireless terminal device in self-driving (self-driving), a wireless terminal device in remote surgery (remote medical supply), a wireless terminal device in smart grid (smart grid), a wireless terminal device in transportation safety (transportation safety), a wireless terminal device in smart city (smart city), a wireless terminal device in smart home (smart home), and the like. The embodiment of the present application does not limit the specific technology and the specific device form adopted by the terminal device.

In the communication between the terminal device 102 and the network device 101, in order to ensure the throughput of the terminal device, the terminal device may perform a Beam Failure Recovery (BFR) process in real time. The BFR procedure is divided into beam failure detection, candidate beam selection and recovery procedures. In the beam failure detection, the terminal device 102 detects a beam (beam) of a Physical Downlink Control Channel (PDCCH) of the terminal device according to a Channel-state-information reference signal (CSI-RS) periodically transmitted by the network device 101. Since a Listen Before Talk (LBT) mechanism needs to be used for channel detection in an unlicensed spectrum to confirm that a channel is idle before sending a reference signal, a periodic reference signal may not be sent, so that it is difficult to perform current beam detection in time and find a condition of beam failure in time.

It is to be understood that the communication system described in the embodiment of the present application is for more clearly illustrating the technical solution of the embodiment of the present application, and does not constitute a limitation to the technical solution provided in the embodiment of the present application, and as a person having ordinary skill in the art knows that along with the evolution of the system architecture and the appearance of a new service scenario, the technical solution provided in the embodiment of the present application is also applicable to similar technical problems.

The BFR method, the sending method of aperiodic CSI-RS and the apparatus thereof provided by the present application are described in detail below with reference to the accompanying drawings.

Referring to fig. 2, fig. 2 is a flowchart illustrating a method for BFR recovery from beam failure according to an embodiment of the present application. The method is applied to the terminal equipment. As shown in fig. 2, the method may include, but is not limited to, the steps of:

step S201: and in response to receiving a first downlink control message DCI of the network equipment, receiving an aperiodic CSI-RS for beam failure detection, wherein the first DCI is used for triggering the terminal equipment to receive the aperiodic CSI-RS.

In the present application, the first Downlink Control Information (DCI) is a message that is sent when the first period CSI-RS is unsuccessfully sent and the current LBT is successful due to a history Listen Before Talk (LBT) failure of the network device. In the application, for an unlicensed spectrum, a network device performs channel detection in real time by using an LBT mechanism, and only when the channel is determined to be idle and a first period CSI-RS transmission time period is reached, the first period CSI-RS is transmitted to a terminal device; if the LBT fails and the transmission time period of the first periodic CSI-RS is reached, the first periodic CSI-RS cannot transmit. In this case, the network device may send the first DCI to the terminal device, triggering the terminal device to receive the aperiodic CSI-RS, when the next LBT is successful.

In the present application, the first periodic CSI-RS and the aperiodic CSI-RS are both used for beam failure detection of the terminal device. The aperiodic CSI-RS used for beam failure detection may be, for example, an aperiodic CSI-RS quasi co-located with a beam of a current PDCCH of the terminal device.

In the application, after receiving the first DCI, the terminal device may determine, according to a pre-configuration, a downlink resource for the network device to send the aperiodic CSI-RS, and receive the aperiodic CSI-RS on the downlink resource.

Step S202: in response to determining that a beam failure occurs based on the measurement of the aperiodic CSI-RS, a recovery procedure is initiated based on the selected target candidate beam.

In this application, in an example, the condition that the Beam Failure occurs may be that the number of Beam Failure Instances (BFIs) is greater than a first number threshold (beamfailure Instance maxcount), and the time interval between adjacent BFIs is less than a time threshold (beamfailure detection timer). The BFI indicates that the measurement result of the CSI-RS is smaller than a first measurement threshold value of the corresponding CSI-RS; a non-BFI indicating that the measurement result of the CSI-RS is greater than or equal to a second measurement threshold value of the corresponding CSI-RS.

In another example, the condition that the beam failure occurs may be that the number of BFIs of the beam failure instances is greater than a first number threshold, and the number of non-BFIs between adjacent BFIs is less than or equal to a second number threshold. The BFI indicates that the measurement result of the CSI-RS is smaller than a first measurement threshold value of the corresponding CSI-RS; a non-BFI indicating that the measurement result of the CSI-RS is greater than or equal to a second measurement threshold value of the corresponding CSI-RS.

In the two examples, the terminal device may determine whether a beam failure occurs according to the measurement result of the aperiodic CSI-RS, the measurement results of the multiple historical CSI-RSs, and the condition of the occurrence of the beam failure. The plurality of historical CSI-RSs are CSI-RSs received by the terminal equipment before the aperiodic CSI-RSs are received. The CSI-RSs in the plurality of historical CSI-RSs can be periodic CSI-RSs; or part of the periodic CSI-RS and part of the aperiodic CSI-RS are determined according to whether LBT failure exists before and the condition of the transmission time period of the first periodic CSI-RS is reached.

It should be noted that the measurement threshold may be the same or different for different CSI-RSs. The first and second measurement thresholds may be the same or different for the same CSI-RS. The measurement threshold may be, for example, a Reference Signal Receiving Power (RSRP) threshold of the L1 layer (physical layer), and/or a Signal to Interference plus Noise Ratio (SINR) threshold of the L1 layer. Under the condition that the measurement threshold value is the RSRP of the L1 layer, the measurement result is the received power of the CSI-RS; in the case where the measurement threshold is SINR of L1 layer, the measurement result is a signal-to-interference-plus-noise ratio of CSI-RS.

In this application, the terminal device may select the target candidate beam in a plurality of manners, and in an example, the manner for the terminal device to select the target candidate beam may include: receiving a periodic CSI-RS for candidate beam selection; selecting a target candidate beam according to the measurement result of the periodic CSI-RS for candidate beam selection.

In this application, in another example, the manner for the terminal device to select the target candidate beam may include: receiving an aperiodic CSI-RS for candidate beam selection in response to receiving a second DCI for the network device; selecting a target candidate beam according to the measurement result of the aperiodic CSI-RS for candidate beam selection.

In this example, the second DCI is used to trigger the terminal device to receive the aperiodic CSI-RS for candidate beam selection. The second DCI is information that is transmitted by the network device when the CSI-RS of the second period is not successfully transmitted due to the historical LBT failure and the current LBT is successful. The second periodic CSI-RS and the aperiodic CSI-RS used for candidate beam selection are both used for candidate beam selection of the terminal device. The aperiodic CSI-RS used for candidate beam selection may be, for example, an aperiodic CSI-RS quasi co-located with the candidate beam.

In this example, after receiving the second DCI, the terminal device may determine, according to a pre-configuration, a downlink resource on which the network device transmits the aperiodic CSI-RS, and receive the aperiodic CSI-RS for candidate beam selection on the downlink resource.

By implementing the embodiment of the application, the terminal equipment can receive the aperiodic CSI-RS for measurement in the time interval of the two first periodic CSI-RSs under the condition that the network equipment does not successfully send the first periodic CSI-RS, so that the aperiodic CSI-RS can be used for carrying out beam failure detection in time.

As a possible implementation manner, please refer to fig. 3, where fig. 3 is a schematic flow chart of another method for recovering BFR for beam failure according to an embodiment of the present application. The method is applied to the terminal equipment. As shown in fig. 3, the method may include, but is not limited to, the following steps:

step S301: receiving Radio Resource Control (RRC) information of the network equipment, wherein the RRC information configures aperiodic CSI-RS used for beam failure detection and aperiodic CSI-RS used for candidate beam selection.

In the application, the aperiodic CSI-RS (q 0') configured by the network device and used for beam failure detection is determined by the network device according to a configured first aperiodic CSI-RS table (candidate detection prslist), wherein the first aperiodic CSI-RS table stores information of a plurality of aperiodic CSI-RSs used for beam failure detection.

The network device may select, from the first aperiodic CSI-RS table, information of an aperiodic CSI-RS quasi co-located with a beam of a current PDCCH of the terminal device, and further determine an aperiodic CSI-RS used for beam failure detection. The first aperiodic CSI-RS table is a table determined by the network device according to the configured N first aperiodic trigger states (aperiodic trigger states). Each of the N first aperiodic trigger states includes a CSI-RS set, and each aperiodic CSI-RS in the CSI-RS set is configured with a Transmission Indication Configuration state (Transmission Configuration Indication state) corresponding to a different beam, so as to determine a quasi-co-location relationship between the beam and the aperiodic CSI-RS. Where N represents the total number of beams of the network device. Each CSI-RS set comprises one aperiodic CSI-RS.

It should be noted that the reportQuantity in the CSI-ReportConfig corresponding to the first aperiodic trigger state may be set to be a none, so as to avoid the network device waiting for the terminal device to feed back the aperiodic CSI-RS for beam failure detection.

In the present application, the aperiodic CSI-RS (q 1') configured by the network device for candidate beam selection is determined by the network device according to a configured second aperiodic CSI-RS table (candidaaprlist), where the second aperiodic CSI-RS table stores information of a plurality of aperiodic CSI-RSs for candidate beam selection.

And the aperiodic CSI-RS in the second aperiodic CSI-RS table is the aperiodic CSI-RS used for candidate beam selection. And the second aperiodic CSI-RS table is a table determined by the network device according to the configured M second aperiodic trigger states (aperiodic trigger states). Each of the M second aperiodic trigger states includes a CSI-RS set, and each aperiodic CSI-RS in the CSI-RS set is configured with a Transmission Indication Configuration state (Transmission Configuration Indication state) corresponding to a different candidate beam for determining a quasi-co-location relationship between the candidate beam and the aperiodic CSI-RS. Wherein M is 1, the CSI-RS set comprises at least one aperiodic CSI-RS, and the number of the aperiodic CSI-RS in the CSI-RS set is consistent with the number of the candidate beams.

It should be noted that the reportQuantity in the CSI-ReportConfig corresponding to the second aperiodic trigger state may be set to be a none, so as to avoid the network device waiting for the terminal device to feed back the aperiodic CSI-RS for selecting the candidate beam.

Step S302: and in response to receiving a first downlink control message DCI of the network equipment, receiving an aperiodic CSI-RS for beam failure detection, wherein the first DCI is used for triggering the terminal equipment to receive the aperiodic CSI-RS.

Step S303: and determining whether beam failure occurs according to the measurement result of the aperiodic CSI-RS.

Step S304: receiving an aperiodic CSI-RS for candidate beam selection in response to receiving the second DCI for the network device.

In this application, the second DCI is used to trigger the terminal device to receive the aperiodic CSI-RS for candidate beam selection. The second DCI is information transmitted by the network device when the second-period CSI-RS is not successfully transmitted due to the historical LBT failure and the current LBT is successful. The second periodic CSI-RS and the aperiodic CSI-RS used for candidate beam selection are both used for candidate beam selection by the terminal device. The aperiodic CSI-RS used for candidate beam selection may be, for example, an aperiodic CSI-RS quasi co-located with the candidate beam.

In the application, after receiving the second DCI, the terminal device may determine, according to a pre-configuration, a downlink resource where the network device sends the aperiodic CSI-RS, and receive the aperiodic CSI-RS for selecting the candidate beam on the downlink resource.

Step S305: selecting the target candidate beam according to a measurement result of the aperiodic CSI-RS for candidate beam selection.

The steps S304 and S305 may be performed simultaneously with the steps S302 and S303. That is, the terminal device may perform beam failure detection and candidate beam selection at the same time.

Step S306: in response to determining that a beam failure occurs based on the measurement of the aperiodic CSI-RS, a recovery procedure is initiated based on the selected target candidate beam.

In the present application, the detailed descriptions of step S302, step S303, and step S306 may refer to any one or more embodiments in the present application, for example, refer to steps S201 and S202 in the embodiment shown in fig. 2, and are not described in detail here.

By implementing the embodiment of the application, after the network equipment configures the aperiodic CSI-RS for beam failure detection and the aperiodic CSI-RS for candidate beam selection, the terminal equipment can receive the aperiodic CSI-RS for beam failure detection in the time interval of two first periodic CSI-RSs for measurement under the condition that the network equipment does not successfully send the first periodic CSI-RS; the terminal equipment can also receive the aperiodic CSI-RS for candidate beam selection in the time interval of two second periodic CSI-RSs for measurement under the condition that the network equipment does not successfully send the second periodic CSI-RS; therefore, the aperiodic CSI-RS used for the beam failure detection can be used for carrying out the beam failure detection in time, and the aperiodic CSI-RS used for the candidate beam selection can be used for carrying out the candidate beam selection in time.

As a possible implementation manner, please refer to fig. 4, where fig. 4 is a flowchart illustrating another method for recovering BFR from beam failure according to an embodiment of the present application. The method is applied to the terminal equipment. As shown in fig. 4, the method may include, but is not limited to, the following steps:

step S401: receiving RRC information of the network equipment, wherein the RRC information configures aperiodic CSI-RS for candidate beam selection.

Step S402: determining aperiodic CSI-RS used for beam failure detection according to the configured first aperiodic CSI-RS table; the first aperiodic CSI-RS table stores information of a plurality of aperiodic CSI-RSs used for beam failure detection.

In the present application, the terminal device may select, from a first aperiodic CSI-RS table (candidate detection on prslist), information of an aperiodic CSI-RS quasi co-located with a beam of a current PDCCH of the terminal device, and further determine an aperiodic CSI-RS (q 0') used for beam failure detection. The first aperiodic CSI-RS table is a table determined by the network device according to the configured N first aperiodic trigger states (aperiodic trigger state). Each of the N first aperiodic trigger states includes a CSI-RS set, and each aperiodic CSI-RS in the CSI-RS set is configured with a Transmission Indication Configuration state (Transmission Configuration Indication state) corresponding to a different beam, so as to determine a quasi-co-location relationship between the beam and the aperiodic CSI-RS. Where N represents the total number of beams of the network device. Each CSI-RS set comprises one aperiodic CSI-RS.

In this application, the first aperiodic CSI-RS table may be sent to the terminal device by the network device through RRC information. The first aperiodic CSI-RS table and the aperiodic CSI-RS information used for candidate beam selection can be carried in the same RRC information and sent to the terminal equipment by the network equipment; or the first aperiodic CSI-RS table and the aperiodic CSI-RS information used for candidate beam selection may be carried in different RRC information and sent to the terminal device by the network device.

In the application, the network device may further send the second aperiodic CSI-RS table to the terminal device through RRC information, and the second aperiodic CSI-RS table may be sent to the terminal device through separate RRC information, or sent to the terminal device through RRC information carried in the same RRC information as the first aperiodic CSI-RS table and the aperiodic CSI-RS information used for candidate beam selection. The RRC message is not specifically limited, and one or more RRC messages may be selected according to actual needs.

Step S403: and in response to receiving a first downlink control message DCI of the network equipment, receiving an aperiodic CSI-RS for beam failure detection, wherein the first DCI is used for triggering the terminal equipment to receive the aperiodic CSI-RS.

Step S404: and determining whether beam failure occurs according to the measurement result of the aperiodic CSI-RS.

Step S405: receiving an aperiodic CSI-RS for candidate beam selection in response to receiving the second DCI for the network device.

In this application, the second DCI is used to trigger the terminal device to receive the aperiodic CSI-RS for candidate beam selection. The second DCI is information transmitted by the network device when the second-period CSI-RS is not successfully transmitted due to the historical LBT failure and the current LBT is successful. The second periodic CSI-RS and the aperiodic CSI-RS used for candidate beam selection are both used for candidate beam selection of the terminal device. The aperiodic CSI-RS used for candidate beam selection may be, for example, an aperiodic CSI-RS quasi co-located with the candidate beam.

In this application, after receiving the second DCI, the terminal device may determine, according to a pre-configuration, a downlink resource where the network device transmits the aperiodic CSI-RS, and receive the aperiodic CSI-RS for selecting the candidate beam on the downlink resource.

Step S406: selecting the target candidate beam according to a measurement result of the aperiodic CSI-RS for candidate beam selection.

The execution of steps S405 and S406 may be performed simultaneously with the execution of steps S403 and S404. That is, the terminal device may perform beam failure detection and candidate beam selection at the same time.

Step S407: in response to determining that a beam failure occurs based on the measurement of the aperiodic CSI-RS, a recovery procedure is initiated based on the selected target candidate beam.

In the present application, detailed descriptions of step S403, step S404, and step S407 may refer to any one or more embodiments in the present application, for example, refer to steps S201 and S202 in the embodiment shown in fig. 2, and are not described in detail here.

By implementing the embodiment of the application, under the condition that the network equipment configures the aperiodic CSI-RS for candidate beam selection and the terminal equipment determines the aperiodic CSI-RS for beam failure detection according to the first aperiodic CSI-RS table, the terminal equipment can receive the aperiodic CSI-RS for beam failure detection in the time interval of two first periodic CSI-RSs for measurement under the condition that the network equipment does not successfully send the first periodic CSI-RS; the terminal equipment can also receive the aperiodic CSI-RS for candidate beam selection in the time interval of two second periodic CSI-RSs for measurement under the condition that the network equipment does not successfully send the second periodic CSI-RS; therefore, the aperiodic CSI-RS used for beam failure detection can be used for beam failure detection in time, and the aperiodic CSI-RS used for candidate beam selection can be used for candidate beam selection in time.

As a possible implementation manner, please refer to fig. 5, and fig. 5 is a flowchart illustrating another method for recovering BFR due to beam failure according to an embodiment of the present application. The method is applied to the terminal equipment. As shown in fig. 5, the method may include, but is not limited to, the following steps:

step S501: and in response to receiving a first downlink control message DCI of the network equipment, receiving an aperiodic CSI-RS for beam failure detection, wherein the first DCI is used for triggering the terminal equipment to receive the aperiodic CSI-RS.

Step S502: and updating the historical beam failure example counting value BFI _ COUNTER and the historical non-beam failure example counting value nonBFI _ COUNTER according to the measurement result of the aperiodic CSI-RS to obtain the current BFI _ COUNTER and the current nonBFI _ COUNTER.

In the application, the historical BFI _ COUNTER and the historical nonBFI _ COUNTER are determined according to the historical CSI-RS received before the aperiodic CSI-RS. The determination method of the historical BFI _ COUNTER and the historical nonBFI _ COUNTER can be as follows: after the last time BFI _ COUNTER and nonBFI _ COUNTER are reset to zero values; and according to the time sequence, sequentially aiming at each historical CSI-RS, performing an updating process on the BFI _ COUNTER and the nonBFI _ COUNTER to obtain the historical BFI _ COUNTER and the historical nonBFI _ COUNTER.

Wherein, for each historical CSI-RS, the updating procedure performed on BFI _ COUNTER and nonBFI _ COUNTER may include: responding to the fact that the measurement result of the historical CSI-RS is smaller than a first measurement threshold value of the historical CSI-RS, adding 1 to BFI _ COUNTER, and carrying out zero clearing on nonBFI _ COUNTER to obtain updated BFI _ COUNTER and nonBFI _ COUNTER; or responding to the measurement result of the historical CSI-RS being larger than or equal to the second measurement threshold of the historical CSI-RS, and adding 1 to the nonBFI _ COUNTER to obtain an updated nonBFI _ COUNTER; and responding to the condition that the nonBFI _ COUNTER is larger than a second quantity threshold value, carrying out zero clearing treatment on the BFI _ COUNTER to obtain the updated nonBFI _ COUNTER.

In this application, the process of updating, by the terminal device, the historical beam failure instance count value BFI _ COUNTER and the historical non-beam failure instance count value nonBFI _ COUNTER according to the measurement result of the aperiodic CSI-RS to obtain the current BFI _ COUNTER and the current nonBFI _ COUNTER may include: responding to the fact that the measurement result of the aperiodic CSI-RS is smaller than a first measurement threshold of the aperiodic CSI-RS, adding 1 to the historical BFI _ COUNTER, and carrying out zero clearing processing on the historical nonBFI _ COUNTER to obtain the current BFI _ COUNTER and the current nonBFI _ COUNTER; or responding to the measurement result of the aperiodic CSI-RS being greater than or equal to a second measurement threshold of the aperiodic CSI-RS, and adding 1 to the historical nonBFI _ COUNTER to obtain the current nonBFI _ COUNTER; and responding to the condition that the current nonBFI _ COUNTER is larger than a second quantity threshold value, and carrying out zero clearing treatment on the historical BFI _ COUNTER to obtain the current nonBFI _ COUNTER.

Step S503: in response to the current BFI _ COUNTER being greater than the first number threshold, it is determined that a beam failure occurred.

Step S504: in response to the current BFI _ COUNTER being less than or equal to the first number threshold, it is determined that no beam failure has occurred.

Step S505: in response to determining that a beam failure occurs based on the measurement of the aperiodic CSI-RS, a recovery procedure is initiated based on the selected target candidate beam.

In the present application, the detailed description of step S501 and step S505 may refer to any one or more embodiments in the present application, for example, refer to step S201 and step S202 in the embodiment shown in fig. 2, and will not be described in detail here.

Compared with the method for judging whether the beam failure occurs specified in the existing protocol, the method for judging whether the beam failure occurs specified in the existing protocol determines that the time interval between two adjacent BFIs is greater than a time threshold value under the condition that a certain first period CSI-RS is not successfully transmitted, so that the condition that the beam failure occurs can be misjudged to be unsatisfied; the method for judging whether the beam failure occurs is determined according to the measurement result of the aperiodic CSI-RS, and if the measurement result of the aperiodic CSI-RS is smaller than the first measurement threshold of the aperiodic CSI-RS, an opposite result can be obtained, namely the condition that the beam failure occurs is met. Therefore, compared with the method for judging whether the beam failure occurs specified in the existing protocol, the method for judging whether the beam failure occurs has high judgment accuracy, and can discover the condition of the beam failure more timely.

By implementing the embodiment of the application, the terminal device can receive the aperiodic CSI-RS for measurement in the time interval of two first periodic CSI-RSs under the condition that the network device does not successfully send the first periodic CSI-RS, and update the historical beam failure instance count value BFI _ COUNTER and the historical non-beam failure instance count value nonBFI _ COUNTER according to the measurement result of the aperiodic CSI-RS to obtain the current BFI _ COUNTER and the current non-BFI _ COUNTER, and further determine whether beam failure occurs or not, so that the condition that beam failure detection errors are caused when a certain first periodic CSI-RS is unsuccessfully sent in a mode of determining beam failure by adopting the BFI _ COUNTER and a time threshold is avoided.

Referring to fig. 6, fig. 6 is a flowchart illustrating a method for sending an aperiodic CSI-RS according to an embodiment of the present application. The method is applied to the network equipment. As shown in fig. 6, the method may include, but is not limited to, the steps of:

step S601: and in response to the first periodic CSI-RS unsuccessfully transmitted due to the historical LBT failure and the current LBT success, transmitting a first downlink control message DCI to the terminal equipment, wherein the first DCI is used for triggering the terminal equipment to receive the aperiodic CSI-RS.

In the application, for an unlicensed spectrum, a Listen Before Talk (LBT) mechanism is adopted by a network device in real time to perform channel detection, and when the channel is confirmed to be idle and reaches a sending time period of a first period CSI-RS, the first period CSI-RS is sent to a terminal device; if the LBT fails and the transmission time period of the first periodic CSI-RS is reached, the first periodic CSI-RS cannot transmit. In this case, the network device may send the first DCI to the terminal device, triggering the terminal device to receive the aperiodic CSI-RS, when the next LBT is successful.

Step S602: and transmitting the aperiodic CSI-RS for beam failure detection to the terminal equipment.

In this application, optionally, when step S601 and step S602 are executed or not, the network device may further execute the following process: responding to unsuccessful sending of a second period CSI-RS caused by historical LBT failure and successful current LBT, and sending a second DCI to the terminal equipment; and sending the aperiodic CSI-RS for candidate beam selection to the terminal equipment.

In this application, the second DCI is used to trigger the terminal device to receive the aperiodic CSI-RS for candidate beam selection. The second periodic CSI-RS and the aperiodic CSI-RS used for candidate beam selection are both used for candidate beam selection by the terminal device. The aperiodic CSI-RS used for candidate beam selection may be, for example, an aperiodic CSI-RS quasi co-located with the candidate beam.

In this application, optionally, before step S601, the network device may further perform the following process: transmitting Radio Resource Control (RRC) information to the terminal equipment, wherein the RRC information configures aperiodic CSI-RS used for beam failure detection and aperiodic CSI-RS used for candidate beam selection; or sending RRC information to the terminal equipment, wherein the RRC information configures the aperiodic CSI-RS for candidate beam selection.

It should be noted that the aperiodic CSI-RS configured by the network device and used for beam failure detection is determined and obtained by the network device according to the configured first aperiodic CSI-RS table, where the first aperiodic CSI-RS table stores information of a plurality of aperiodic CSI-RSs used for beam failure detection.

It should be further noted that the aperiodic CSI-RS configured by the network device and used for candidate beam selection is determined and obtained by the network device according to a configured second aperiodic CSI-RS table, where the second aperiodic CSI-RS table stores information of a plurality of aperiodic CSI-RSs used for candidate beam selection.

And the aperiodic CSI-RS in the second aperiodic CSI-RS table is the aperiodic CSI-RS used for candidate beam selection. And the second aperiodic CSI-RS table is a table determined by the network device according to the configured M second aperiodic trigger states (aperiodic trigger states). Each of the M second aperiodic trigger states comprises a CSI-RS set, each aperiodic CSI-RS in the CSI-RS set is configured with a Transmission Indication Configuration state (Transmission Configuration Indication state) corresponding to a different candidate beam, and the Transmission Indication Configuration state is used for determining quasi-co-location relation between the candidate beam and the aperiodic CSI-RS. Wherein M is 1, the CSI-RS set comprises at least one aperiodic CSI-RS, and the number of the aperiodic CSI-RS in the CSI-RS set is consistent with the number of the candidate beams.

By implementing the embodiment of the application, the network equipment can send the aperiodic CSI-RS within the time interval of two first periodic CSI-RSs under the condition that the first periodic CSI-RS is not successfully sent, so that the terminal equipment can timely receive the aperiodic CSI-RS and carry out measurement, and beam failure detection can be timely carried out.

In the embodiments provided in the present application, the methods provided in the embodiments of the present application are introduced from the perspective of the terminal device and the network device, respectively. In order to implement the functions in the method provided by the embodiment of the present application, the terminal device and the network device may include a hardware structure and a software module, and the functions are implemented in the form of a hardware structure, a software module, or a hardware structure and a software module. Some of the above functions may be implemented by a hardware structure, a software module, or a hardware structure plus a software module.

Fig. 7 is a schematic structural diagram of a communication device 70 according to an embodiment of the present disclosure. The communication device 70 shown in fig. 7 may include a transceiving unit 701 and a processing unit 702. The transceiver unit 701 may include a transmitting unit and/or a receiving unit, where the transmitting unit is configured to implement a transmitting function, the receiving unit is configured to implement a receiving function, and the transceiver unit 701 may implement a transmitting function and/or a receiving function.

The communication device 70 may be a terminal device, or may be a device in the terminal device, for example, a beam failure recovery BFR device, or may be a device that can be used in cooperation with the terminal device. Alternatively, the communication device 70 may be a network device, or may be a device in a network device, for example, a transmission device of the aperiodic CSI-RS, or may be a device that can be used in cooperation with a network device.

The communication device 70 is a terminal apparatus including:

a transceiving unit, configured to receive an aperiodic CSI-RS for beam failure detection in response to receiving a first downlink control message DCI of a network device, where the first DCI is used to trigger the terminal device to receive the aperiodic CSI-RS;

and the processing unit is used for responding to the fact that the beam failure is determined to occur according to the measurement result of the aperiodic CSI-RS, and initiating a recovery process according to the selected target candidate beam.

In one possible implementation, the processing unit is specifically configured to,

responding to the fact that the measurement result of the aperiodic CSI-RS is smaller than a first measurement threshold of the aperiodic CSI-RS, adding 1 to the historical BFI _ COUNTER, and conducting zero clearing on the historical nonBFI _ COUNTER to obtain the current BFI _ COUNTER and the current nonBFI _ COUNTER;

alternatively, the first and second electrodes may be,

In a possible implementation manner, the transceiver unit is further configured to receive radio resource control, RRC, information of the network device, where the RRC information configures an aperiodic CSI-RS used for beam failure detection and an aperiodic CSI-RS used for candidate beam selection;

alternatively, the first and second electrodes may be,

the transceiver unit is further configured to receive RRC information of the network device, where the RRC information configures an aperiodic CSI-RS used for candidate beam selection;

the processing unit is further configured to determine an aperiodic CSI-RS for beam failure detection according to the configured first aperiodic CSI-RS table; wherein the first aperiodic CSI-RS table stores information of a plurality of aperiodic CSI-RSs for beam failure detection.

The communication device 70 is a network apparatus including:

a transceiving unit, configured to send a first downlink control message DCI to a terminal device in response to unsuccessful transmission of a first periodic CSI-RS caused by a historical LBT failure and successful current LBT, where the first DCI is used to trigger the terminal device to receive the aperiodic CSI-RS;

the transceiver unit is further configured to send an aperiodic CSI-RS for beam failure detection to the terminal device.

In a possible implementation manner, the transceiver unit is further configured to send a second DCI to the terminal device in response to that the second-period CSI-RS is not successfully sent due to the historical LBT failure and the current LBT is successful;

the transceiver unit is further configured to transmit an aperiodic CSI-RS for candidate beam selection to the terminal device.

In a possible implementation manner, the transceiver unit is further configured to transmit radio resource control RRC information to the terminal device, where the RRC information configures an aperiodic CSI-RS for beam failure detection and an aperiodic CSI-RS for candidate beam selection;

alternatively, the first and second electrodes may be,

the transceiver unit is further configured to send RRC information to the terminal device, where the RRC information configures an aperiodic CSI-RS for candidate beam selection.

Referring to fig. 8, fig. 8 is a schematic structural diagram of another communication device 80 according to an embodiment of the present disclosure. The communication device 80 may be a network device, a terminal device, a chip, a system-on-chip, or a processor that supports the network device to implement the method, or a chip, a system-on-chip, or a processor that supports the terminal device to implement the method. The apparatus may be configured to implement the method described in the method embodiment, and refer to the description in the method embodiment.

The communication device 80 may include one or more processors 801. The processor 801 may be a general purpose processor, a special purpose processor, or the like. For example, a baseband processor or a central processor. The baseband processor may be configured to process communication protocols and communication data, and the central processor may be configured to control a communication device (e.g., a base station, a baseband chip, a terminal device chip, a DU or CU, etc.), execute a computer program, and process data of the computer program.

Optionally, the communication apparatus 80 may further include one or more memories 802, on which a computer program 804 may be stored, and the processor 801 executes the computer program 804, so that the communication apparatus 80 performs the method described in the above method embodiment. Optionally, the memory 802 may further store data. The communication device 80 and the memory 802 may be provided separately or may be integrated together.

Optionally, the communication device 80 may further include a transceiver 805, an antenna 806. The transceiver 805 may be referred to as a transceiving unit, a transceiver, or a transceiving circuit, etc. for implementing transceiving functions. The transceiver 805 may include a receiver and a transmitter, and the receiver may be referred to as a receiver or a receiving circuit, etc. for implementing a receiving function; the transmitter may be referred to as a transmitter or a transmission circuit, etc. for implementing the transmission function.

Optionally, one or more interface circuits 807 may also be included in the communications device 80. The interface circuit 807 is used to receive code instructions and transmit them to the processor 801. The processor 801 executes the code instructions to cause the communication device 80 to perform the methods described in the above method embodiments.

The communication device 80 is a terminal apparatus: the processor 801 is configured to execute step S202 in fig. 2; performing step S303, step S305, and step S306 in fig. 3; steps S402, S404, S406, and S407 in fig. 4; steps S502, S503, S504, and S505 in fig. 5. The transceiver 805 is configured to perform step S201 in fig. 2; executing step S301, step S302, and step S304 in fig. 3; steps S401, S403, and S405 in fig. 4; step S501 in fig. 5.

The communication device 80 is a network device: the transceiver 805 is configured to perform step S601 and step S602 in fig. 6.

In one implementation, the processor 801 may include a transceiver to perform receive and transmit functions. The transceiver may be, for example, a transceiver circuit, or an interface circuit. The transmit and receive circuitry, interfaces or interface circuitry used to implement the receive and transmit functions may be separate or integrated. The transceiver circuit, the interface circuit or the interface circuit may be used for reading and writing code/data, or the transceiver circuit, the interface circuit or the interface circuit may be used for transmitting or transferring signals.

In one implementation, the processor 801 may have a computer program 803 stored thereon, and the computer program 803 running on the processor 801 may cause the communication apparatus 80 to perform the method described in the above method embodiments. The computer program 803 may be solidified in the processor 801, in which case the processor 801 may be implemented in hardware.

In one implementation, the communication device 80 may include circuitry that may implement the functionality of transmitting or receiving or communicating in the foregoing method embodiments. The processors and transceivers described herein may be implemented on Integrated Circuits (ICs), analog ICs, radio Frequency Integrated Circuits (RFICs), mixed signal ICs, application Specific Integrated Circuits (ASICs), printed Circuit Boards (PCBs), electronic devices, and the like. The processor and transceiver may also be fabricated using various IC process technologies, such as Complementary Metal Oxide Semiconductor (CMOS), N-type metal oxide semiconductor (NMOS), P-type metal oxide semiconductor (PMOS), bipolar Junction Transistor (BJT), bipolar CMOS (BiCMOS), silicon germanium (SiGe), gallium arsenide (GaAs), and the like.

The communication apparatus in the above description of the embodiment may be a network device or a terminal device (such as the first terminal device in the foregoing embodiment of the method), but the scope of the communication apparatus described in the present application is not limited thereto, and the structure of the communication apparatus may not be limited by fig. 8. The communication means may be a stand-alone device or may be part of a larger device. For example, the communication means may be:

(1) A stand-alone integrated circuit IC, or chip, or system-on-chip or subsystem;

(2) A set of one or more ICs, which optionally may also include storage means for storing data, computer programs;

(3) An ASIC, such as a Modem (Modem);

(4) A module that may be embedded within other devices;

(5) Receivers, terminal devices, intelligent terminal devices, cellular phones, wireless devices, handsets, mobile units, in-vehicle devices, network devices, cloud devices, artificial intelligence devices, and the like;

(6) Others, and so forth.

For the case that the communication device may be a chip or a system of chips, see the schematic structural diagram of the chip shown in fig. 9. The chip shown in fig. 9 comprises a processor 901 and an interface 902. The number of the processors 901 may be one or more, and the number of the interfaces 902 may be more.

Optionally, the chip further comprises a memory 903, the memory 903 being used for storing necessary computer programs and data.

Those skilled in the art will also appreciate that the various illustrative logical blocks and steps (step) set forth in the embodiments of the present application may be implemented in electronic hardware, computer software, or combinations of both. Whether such functionality is implemented as hardware or software depends upon the particular application and design requirements of the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the embodiments of the present application.

An embodiment of the present application further provides a communication system, where the system includes the communication apparatus serving as the terminal device in the foregoing embodiment in fig. 7 and the communication apparatus serving as the network device, or the system includes the communication apparatus serving as the terminal device and the communication apparatus serving as the network device in the foregoing embodiment in fig. 8.

The present application also provides a readable storage medium having stored thereon instructions which, when executed by a computer, implement the functionality of any of the above-described method embodiments.

The present application also provides a computer program product which, when executed by a computer, implements the functionality of any of the above-described method embodiments.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs. The procedures or functions according to the embodiments of the present application are wholly or partially generated when the computer program is loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer program can be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer program can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that includes one or more available media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a Digital Video Disk (DVD)), or a semiconductor medium (e.g., a Solid State Disk (SSD)), among others.

Those of ordinary skill in the art will understand that: the various numbers of the first, second, etc. mentioned in this application are only used for the convenience of description and are not used to limit the scope of the embodiments of this application, but also to indicate the sequence.

At least one of the present applications may also be described as one or more, and a plurality may be two, three, four or more, and the present application is not limited thereto. In the embodiment of the present application, for a technical feature, the technical features in the technical feature are distinguished by "first", "second", "third", "a", "B", "C", and "D", and the like, and the technical features described in "first", "second", "third", "a", "B", "C", and "D" are not in a sequential order or a size order.

The correspondence shown in the tables in the present application may be configured or predefined. The values of the information in each table are only examples, and may be configured to other values, which is not limited in the present application. When the correspondence between the information and each parameter is configured, it is not always necessary to configure all the correspondences indicated in each table. For example, in the table in the present application, the correspondence shown in some rows may not be configured. For another example, appropriate modification adjustments, such as splitting, merging, etc., can be made based on the above tables. The names of the parameters in the tables may be other names understandable by the communication device, and the values or the expression of the parameters may be other values or expressions understandable by the communication device. When the above tables are implemented, other data structures may be used, for example, arrays, queues, containers, stacks, linear tables, pointers, linked lists, trees, graphs, structures, classes, heaps, hash tables, or hash tables may be used.

Predefinition in this application may be understood as defining, predefining, storing, pre-negotiating, pre-configuring, curing, or pre-firing.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

A BFR method for recovering beam failure is characterized in that the BFR method is applied to a terminal device, and the method comprises the following steps:

receiving an aperiodic CSI-RS for beam failure detection in response to receiving a first downlink control message DCI of a network device, wherein the first DCI is used for triggering the terminal device to receive the aperiodic CSI-RS;

initiating a recovery process according to the selected target candidate beam in response to determining that a beam failure occurs according to the measurement result of the aperiodic CSI-RS.
The method of claim 1, wherein the beam failure occurs on a condition that a number of beam failure instances, BFIs, is greater than a first number threshold and a number of non-BFIs between adjacent BFIs is less than or equal to a second number threshold;

the BFI indicates that the measurement result of the CSI-RS is smaller than a first measurement threshold value of the corresponding CSI-RS;

the non-BFI indicates that the measurement result of the CSI-RS is greater than or equal to a second measurement threshold value of the corresponding CSI-RS.
The method of claim 1 or 2, wherein determining whether a beam failure occurs according to the measurement result of the aperiodic CSI-RS comprises:

according to the measurement result of the non-periodic CSI-RS, updating a historical wave beam failure example counting value BFI _ COUNTER and a historical non-wave beam failure example counting value nonBFI _ COUNTER to obtain a current BFI _ COUNTER and a current nonBFI _ COUNTER;

determining that a beam failure occurs in response to the current BFI _ COUNTER being greater than a first quantity threshold;

determining that no beam failure has occurred in response to the current BFI _ COUNTER being less than or equal to the first number threshold.
The method according to claim 3, wherein the updating the historical BFI _ COUNTER and the historical non-beam failure instance COUNTER value nonBFI _ COUNTER according to the measurement result of the aperiodic CSI-RS to obtain a current BFI _ COUNTER and a current nonBFI _ COUNTER comprises:

responding to the fact that the measurement result of the aperiodic CSI-RS is smaller than a first measurement threshold of the aperiodic CSI-RS, adding 1 to the historical BFI _ COUNTER, and carrying out zero clearing on the historical nonBFI _ COUNTER to obtain the current BFI _ COUNTER and the current nonBFI _ COUNTER;

alternatively, the first and second electrodes may be,

responding to the fact that the measurement result of the aperiodic CSI-RS is larger than or equal to a second measurement threshold of the aperiodic CSI-RS, and adding 1 to the historical nonBFI _ COUNTER to obtain the current nonBFI _ COUNTER;

and responding to the situation that the current nonBFI _ COUNTER is larger than a second quantity threshold value, and carrying out zero clearing treatment on the historical BFI _ COUNTER to obtain the current nonBFI _ COUNTER.
The method of claim 1, wherein selecting the target candidate beam comprises:

receiving an aperiodic CSI-RS for candidate beam selection in response to receiving a second DCI for the network device;

selecting the target candidate beam according to a measurement result of the aperiodic CSI-RS for candidate beam selection.
The method of claim 1 or 5, further comprising, prior to receiving the aperiodic CSI-RS for beam failure detection:

receiving Radio Resource Control (RRC) information of the network equipment, wherein the RRC information configures aperiodic CSI-RS used for beam failure detection and aperiodic CSI-RS used for candidate beam selection;

alternatively, the first and second electrodes may be,

receiving RRC information of the network equipment, wherein the RRC information configures aperiodic CSI-RS for candidate beam selection;

determining aperiodic CSI-RS used for beam failure detection according to the configured first aperiodic CSI-RS table; wherein the first aperiodic CSI-RS table stores information of a plurality of aperiodic CSI-RSs for beam failure detection.
A method for transmitting aperiodic CSI-RS, which is applied to a network device, the method comprising:

in response to unsuccessful transmission of a first periodic CSI-RS caused by historical LBT failure and successful current LBT, transmitting a first downlink control message (DCI) to a terminal device, wherein the first DCI is used for triggering the terminal device to receive the aperiodic CSI-RS;

and sending the aperiodic CSI-RS for beam failure detection to the terminal equipment.
The method of claim 7, further comprising:

responding to unsuccessful sending of a second period CSI-RS caused by historical LBT failure and successful current LBT, and sending a second DCI to the terminal equipment;

and sending the aperiodic CSI-RS for candidate beam selection to the terminal equipment.
The method according to claim 7 or 8, wherein before transmitting the aperiodic CSI-RS for beam failure detection to the terminal device, further comprising:

transmitting Radio Resource Control (RRC) information to the terminal equipment, wherein the RRC information configures aperiodic CSI-RS used for beam failure detection and aperiodic CSI-RS used for candidate beam selection; alternatively, the first and second electrodes may be,

and sending RRC information to the terminal equipment, wherein the RRC information configures aperiodic CSI-RS used for candidate beam selection.
A Beam Failure Recovery (BFR) device is applied to a terminal device, and the device comprises:

a transceiving unit, configured to receive an aperiodic CSI-RS for beam failure detection in response to receiving a first downlink control message DCI of a network device, where the first DCI is used to trigger the terminal device to receive the aperiodic CSI-RS;

and the processing unit is used for responding to the fact that the beam failure is determined to occur according to the measurement result of the aperiodic CSI-RS, and initiating a recovery process according to the selected target candidate beam.
The apparatus of claim 10, wherein a condition for occurrence of a beam failure is that a number of beam failure instances, BFIs, is greater than a first number threshold, and a number of non-BFIs between adjacent BFIs less than or equal to a second number threshold;

the BFI indicates that the measurement result of the CSI-RS is smaller than a first measurement threshold value of the corresponding CSI-RS;

the non-BFI indicates that the measurement result of the CSI-RS is greater than or equal to a second measurement threshold value of the corresponding CSI-RS.
The device according to claim 10 or 11, characterized in that the processing unit is specifically configured to,

updating a historical beam failure example counting value BFI _ COUNTER and a historical non-beam failure example counting value nonBFI _ COUNTER according to the measurement result of the aperiodic CSI-RS to obtain a current BFI _ COUNTER and a current nonBFI _ COUNTER;

determining that a beam failure occurs in response to the current BFI _ COUNTER being greater than a first quantity threshold;

determining that no beam failure has occurred in response to the current BFI _ COUNTER being less than or equal to the first number threshold.
The apparatus according to claim 12, characterized in that the processing unit is specifically configured to,

responding to the fact that the measurement result of the aperiodic CSI-RS is smaller than a first measurement threshold of the aperiodic CSI-RS, adding 1 to the historical BFI _ COUNTER, and carrying out zero clearing on the historical nonBFI _ COUNTER to obtain the current BFI _ COUNTER and the current nonBFI _ COUNTER;

alternatively, the first and second electrodes may be,

responding to the fact that the measurement result of the aperiodic CSI-RS is larger than or equal to a second measurement threshold of the aperiodic CSI-RS, and adding 1 to the historical nonBFI _ COUNTER to obtain the current nonBFI _ COUNTER;

and responding to the condition that the current nonBFI _ COUNTER is larger than a second quantity threshold value, and performing zero clearing processing on the historical BFI _ COUNTER to obtain the current nonBFI _ COUNTER.
The apparatus according to claim 10, characterized in that the processing unit is specifically configured to,

receiving an aperiodic CSI-RS for candidate beam selection in response to receiving a second DCI for the network device;

selecting the target candidate beam according to a measurement result of the aperiodic CSI-RS for candidate beam selection.
The apparatus according to claim 10 or 14, wherein the transceiver unit is further configured to receive radio resource control, RRC, information of the network device, where the RRC information configures aperiodic CSI-RS for beam failure detection and aperiodic CSI-RS for candidate beam selection;

alternatively, the first and second electrodes may be,

the transceiver unit is further configured to receive RRC information of the network device, where the RRC information configures an aperiodic CSI-RS for candidate beam selection;

the processing unit is further configured to determine an aperiodic CSI-RS for beam failure detection according to the configured first aperiodic CSI-RS table; wherein the first aperiodic CSI-RS table stores information of a plurality of aperiodic CSI-RSs for beam failure detection.
An aperiodic CSI-RS transmitting device, which is applied to a network device, and comprises:

a transceiving unit, configured to send a first downlink control message DCI to a terminal device in response to unsuccessful transmission of a first periodic CSI-RS caused by a historical LBT failure and successful current LBT, where the first DCI is used to trigger the terminal device to receive the aperiodic CSI-RS;

the transceiver unit is further configured to send an aperiodic CSI-RS for beam failure detection to the terminal device.
The apparatus of claim 16, wherein the transceiving unit is further configured to send a second DCI to the terminal device in response to the second periodic CSI-RS being unsuccessfully sent due to the historical LBT failure and the current LBT being successful;

the transceiver unit is further configured to transmit an aperiodic CSI-RS for candidate beam selection to the terminal device.
The apparatus according to claim 16 or 17, wherein the transceiver unit is further configured to transmit radio resource control, RRC, information to the terminal device, wherein the RRC information configures aperiodic CSI-RS for beam failure detection and aperiodic CSI-RS for candidate beam selection;

alternatively, the first and second electrodes may be,

the transceiver unit is further configured to send RRC information to the terminal device, where the RRC information configures an aperiodic CSI-RS used for candidate beam selection.
A communication apparatus, characterized in that the apparatus comprises a processor and a memory, in which a computer program is stored which, when being executed by the processor, causes the apparatus to carry out the method according to any one of claims 1 to 6.
A communication apparatus, characterized in that the apparatus comprises a processor and a memory, in which a computer program is stored which, when executed by the processor, causes the apparatus to carry out the method according to any one of claims 7 to 9.
A communications apparatus, comprising: a processor and an interface circuit;

the interface circuit is used for receiving code instructions and transmitting the code instructions to the processor;

the processor to execute the code instructions to perform the method of any one of claims 1 to 6.
A communications apparatus, comprising: a processor and an interface circuit;

the interface circuit is used for receiving code instructions and transmitting the code instructions to the processor;

the processor to execute the code instructions to perform the method of any one of claims 7 to 9.
A computer-readable storage medium storing instructions that, when executed, implement the method of any one of claims 1 to 6.
A computer-readable storage medium storing instructions that, when executed, implement the method of any one of claims 7 to 9.