Beam failure recovery method, device and communication system
​TECHNICAL FIELD
[0001]
​The present application relates to the field of communications, and in particular, to a beam failure recovery method and apparatus, and a communication system.
​BACKGROUND OF THE INVENTION
[0002]
​Beam failure (beam failure) mainly refers to the influence of factors such as weather, obstacle and direction angle of a communication link in a high-frequency communication scenario, so as to transmit a failure in an original beam direction.
[0003]
​Beam failure recovery (BFR) technology mainly refers to, in the case of beam failure, quickly positioning a new reliable beam direction by using a measurement result of beam power in different directions, thereby completing fast recovery of the link.
[0004]
​A terminal device detects a reference signal (RS) associated with a downlink control channel (PDCCH), thereby determining whether a beam failure occurs; and when it is determined that the beam failure occurs, sending a beam failure request to the network device, and monitoring feedback of the network device for the beam failure request. When the terminal device receives a BFR response sent by the network device and that is related to the beam failure recovery sent by the network device through the downlink control information (DCI), the original direction of the beam used for data reception is switched to the direction of another candidate beam, so that the failed link can be quickly recovered, and the reduction of delay and system throughput caused by link failure is reduced.
[0005]
​It should be noted that the above description of the technical background is only for a clear and complete explanation of the technical solutions of the present application, and it is convenient for a person skilled in the art to understand.. The above technical solutions are not considered to be known to those skilled in the art only because these solutions are set forth in the background section of the present application.
[0006]
​SUMMARY OF THE INVENTION
[0007]
​The inventor of the present application finds that, in the existing beam failure recovery technology, the resource used for receiving the beam failure recovery related response (BFR response) is the same as the control channel resource that is reset after the beam recovery succeeds, but when the two are not the same, how the terminal device resets the spatial direction of the downlink is not described.
[0008]
​In addition, the inventor of the present application also finds that the existing beam failure recovery technology can only be used for one carrier. In a multi-carrier scenario, at a certain moment, the connection on different carriers may only have a part of beam failure, in this case, after receiving a BFR response related to beam failure recovery, the terminal device sets the spatial direction of the downlink and does not explicitly specify.
[0009]
​In addition, in a multi-carrier scenario, one subcarrier may not be used to receive a control channel resource, how to reset the spatial direction of the data channel of the subcarrier, and there is no clear requirement at present.
[0010]
​In another scenario, one terminal device is most likely to configure 32 sub-carriers, beam failure measurement is performed on each sub-carrier respectively, and recovery may cause the terminal to interact too frequently with the network side, and there is no reliable method to solve this problem at present.
[0011]
​In order to solve at least one of the above technical problems, an embodiment of the present application provides a beam failure recovery method and apparatus, and a communication system. In the beam failure recovery method in this embodiment, after receiving a period of time that a response (BFR response) related to beam failure recovery is received, the terminal device switches the beam direction even if the control channel resource receiving the BFR response is different from the reset control channel resource, or in a scenario of multiple carriers, the terminal device can reliably perform beam direction switching in sufficient time, thereby improving system performance.
[0012]
​According to a first aspect of the embodiments of this application, a beam failure recovery apparatus is provided, which is disposed at a terminal device, and the apparatus includes: a receiving unit configured to monitor and/or receive a downlink signal in a first cell of the terminal device according to a Quasi-co-located (QCL) parameter in a first cell of the terminal device according to an antenna Quasi co-located (QCL) parameter that is the same as the selected reference signal (Q_new) or the reference signal (Q_new) indicated by the higher layer before the terminal device receives a response (BFR response) related to beam failure recovery.
[0013]
​According to a second aspect of the embodiments of the present application, there is provided a beam failure recovery apparatus, applied to a network device, the apparatus comprising: a first indication unit, configured to send, to a terminal device, signaling indicating that beam failure recovery is jointly performed between two or more cells of the terminal device; or, the apparatus comprises: a second indication unit, configured to send, to the terminal device, a cell for monitoring and/or receiving a downlink signal, and/or a bandwidth part, and/or a signaling of a control resource set (CORESET).
[0014]
​The beam failure recovery method is applied to a terminal device, and the method comprises: before the terminal device receives a period of time related to beam failure recovery, the terminal device monitoring and/or receiving a downlink signal in a first cell according to the same antenna Quasi co-located (QCL) parameter as the selected reference signal (Q_new) or the reference signal (Q_new) indicated by the higher layer.
[0015]
​According to a third aspect of the embodiments of the present application, there is provided a communication system, the communication system comprising a terminal device and a network device, the terminal device comprising the beam failure recovery device according to the first aspect of the above embodiments.
[0016]
​The beneficial effects of the embodiments of the present application are that: after receiving a period of time of a response (BFR response) related to beam failure recovery, the terminal device switches the beam direction, so that the terminal device can reliably switch the beam direction with sufficient time, thereby improving system performance.
[0017]
​With reference to the following description and drawings, specific embodiments of the present application are disclosed in detail, and the manner in which the principles of the present application may be employed is indicated. It should be understood that the embodiments of the present application are not limited in scope. Within the scope of the appended claims, embodiments of the present application include many changes, modifications, and equivalents.
[0018]
​Features described and/or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.
[0019]
​It should be emphasized that the term "comprising/comprising" when used herein refers to the presence of features, integers, steps or components, but does not preclude the presence or addition of one or more other features, integers, steps or components.
​BRIEF DESCRIPTION OF THE DRAWINGS
[0020]
​Elements and features described in one or more embodiments of the embodiments of this application may be combined with elements and features illustrated in one or more other figures or implementations. In addition, in the drawings, like reference numerals designate corresponding parts in several drawings, and may be used to indicate corresponding components used in more than one embodiment.
[0021]
​The accompanying drawings are included to provide a further understanding of the embodiments of this application, and constitute a part of the specification, which is used to exemplify the embodiments of the present application and explain the principles of the present disclosure together with the text description.. Obviously, the drawings in the following description are merely some embodiments of the present application, and those of ordinary skill in the art can obtain other drawings according to these drawings without creative efforts.. In the drawings:
[0022]
​FIG. 1 is a schematic diagram of a communication system according to this application;
[0023]
​FIG. 2 is a schematic diagram of a beam failure recovery method according to Embodiment 1 of this application;
[0024]
​FIG. 3 (A) is a schematic diagram of a beam failure recovery method applied to a single carrier scenario according to Embodiment 1 of this application;
[0025]
​FIG. 3 (B) is a schematic diagram of a beam failure recovery method applied to a multi-carrier scenario according to Embodiment 1 of this application;
[0026]
​FIG. 4 is a schematic diagram of a beam failure recovery apparatus according to Embodiment 2 of this application;
[0027]
​FIG. 5 is a schematic diagram of a terminal device according to Embodiment 3 of this application;
[0028]
​FIG. 6 is a schematic diagram of a beam failure recovery method according to Embodiment 4 of this application;
[0029]
​FIG. 7 is a schematic diagram of a beam failure recovery method according to Embodiment 5 of this application;
[0030]
​FIG. 8 is a schematic diagram of a beam failure recovery apparatus according to Embodiment 6 of this application;
[0031]
​FIG. 9 is a schematic diagram of a beam failure recovery apparatus according to Embodiment 7 of this application;
[0032]
​FIG. 10 is a schematic diagram of a network device according to Embodiment 8 of this application;
​DETAILED DESCRIPTION OF THE EMBODIMENTS
[0033]
​The foregoing and other features of the present application will become apparent from the following description with reference to the accompanying drawings.. In the specification and the drawings, specific embodiments of the present application are specifically disclosed, which show some embodiments in which the principles of the present application may be employed, and it should be understood that the present application is not limited to the described embodiments, but on the contrary, the present application includes all modifications, variations, and equivalents falling within the scope of the appended claims.. Various embodiments of the present disclosure will be described below with reference to the accompanying drawings.. These embodiments are exemplary only, and are not intended to limit the present application.
[0034]
​In this embodiment of this application, the terms "first", "second" and the like are used to distinguish different elements from names, but do not indicate the spatial arrangement or chronological order of these elements, etc. and these elements should not be limited by these terms. The term "and/or" includes any and all combinations of one or more of the associated listed terms. The terms "comprising," " including, " "having," and the like refer to the presence of stated features, elements, elements, or components, but do not preclude the presence or addition of one or more other features, elements, elements, or components.
[0035]
​In the embodiments of this application, the singular forms "a," " the, "and the like include plural forms and should be construed broadly to mean" a "or" a type "and not to limit the meaning of" an "; in addition, the term" the "should be understood to include both the singular and the plural as well, unless the context clearly indicates otherwise. In addition, the term" according to "should be understood as" based at least in part on. The term "based on" should be understood as "based at least in part on." Unless the context clearly dictates otherwise.
[0036]
​In this embodiment of this application, the term "communication network" or "wireless communication network" may refer to a network conforming to any communication standard, such as Long Term Evolution (LTE), enhanced Long Term Evolution (LTE-A, LTE-Advanced), Wideband Code Division Multiple Access (WCDMA), Wideband Code Division Multiple Access (WCDMA), High Speed Packet Access (HSPA), High-Speed Packet Access (HSPA), etc.
[0037]
​In addition, the communication between devices in the communication system may be performed according to a communication protocol at any stage, for example, may include, but is not limited to, the following communication protocols: 1G (Generation), 2G, 2.5 G, 2.75 G, 3G, 4G, 4.5 G, and future 5G, New Radio (NR, New Radio, etc.), and/or other communication protocols currently known or future to be developed.
[0038]
​In this embodiment of this application, the term "network device", for example, refers to a device in a communication system for accessing a terminal device to a communication network and providing a service for the terminal device. The network device may include, but is not limited to, a base station (BS), an access point (AP), a transmission reception point (TRP), a transmission reception point (AP), a broadcast transmitter, a mobility management entity (MME), a mobile management entity (RNC), a gateway, a server, a radio network controller (RNC), and a radio network controller (RNC).​For example, the Base Station Controller (BSC) and the Base Station Controller (BSC), etc.
[0039]
​The base station may include, but is not limited to, a Node B (NodeB or NB), an evolved Node B (eNodeB or eNB), and a 5G base station (GMS), and the like, and may further include a Remote Radio Head (RRH), a Remote Radio Unit (RRU), a Remote Radio Unit (RRU), a relay or a low power node (eg, a Femto, a Pico, etc.). And the term "base station" may include some or all of their functionalities, each of which may provide communication coverage for a particular geographic area. The term "cell" may refer to a base station and/or its coverage area, depending on the context in which the term is used
[0040]
​In this embodiment of this application, the term "user equipment" (UE) or "terminal device" (TE) refers to a device that accesses a communication network through a network device and receives a network service. The terminal device may be fixed or mobile, and may also be referred to as a mobile station (MS), a terminal, a subscriber station (SS), an access terminal (AT), a station, etc.
[0041]
​The terminal device may include, but is not limited to, a Cellular Phone, a Personal Digital Assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a machine-type communication device, a laptop computer, a cordless telephone, a smartphone, a smart watch, a Digital camera, etc.
[0042]
​For another example, in a scenario such as an Internet of Things (Internet of Things), a terminal device may also be a machine or a device for monitoring or measuring, for example, may include, but is not limited to, a machine-type communication (MTC) terminal, a vehicle-mounted communication terminal, a device-to-device (D2D) terminal, a machine-to-machine (M2M) terminal, and the like.
[0043]
​The following describes the scenario of the embodiments of this application by way of example, but the present application is not limited thereto.
[0044]
​FIG. 1 is a schematic diagram of a communication system according to the present application, and schematically illustrates a case in which a terminal device and a network device are used as an example, as shown in FIG. 1, the communication system 100 May include a network device 101 and a terminal device 102 (for simplicity, FIG. 1 is merely illustrative for one terminal device).
[0045]
​In this embodiment of this application, existing services or future implementations may be implemented between the network device 101 and the terminal device 102. For example, these services include, but are not limited to: Enhanced Mobile Broadband (Enhanced Mobile Broadband), Large-Scale Machine Type Communication (MWU), Massive Machine Type Communication (URLLC), and High Reliability Low Latency Communication (URLLC), etc.
[0046]
​The terminal device 102 May send data to the network device 101, for example, using an authorization or grant-free transmission mode. The terminal device 101 May receive data sent by the one or more terminal devices 102 and feed back information to the terminal device 102, for example, to confirm ACK/NACK information, etc. and the terminal device 102 May confirm the end transmission process according to the feedback information, or may further perform new data transmission, or may perform data retransmission.
[0047]
​In addition, before the terminal device 102 accesses the network device 101, the network device 101 May send information related to the system information to the terminal device 102, and the terminal device 102 detects the received information to realize downlink synchronization, and establishes a connection with the network device 101.
[0048]
​In the following, the network device in the communication system is used as a sending end, and the terminal device is used as an example for description, but the present application is not limited thereto, and the sending end and/or the receiving end may also be other devices.. For example, the present application is not only applicable to signal transmission between a network device and a terminal device, but also applicable to signal transmission between two terminal devices.
[0049]
​Embodiment 1
[0050]
​Embodiment 1 of the present application provides a Beam Failure Recovery (BFR) method, and the method may be performed by a terminal device.
[0051]
​FIG. 2 is a schematic diagram of a beam failure recovery method according to an embodiment, as shown in FIG. 2, the method includes:
[0052]
​Step 201: The terminal device monitors and/or receives the downlink signal in the first cell according to the same antenna Quasi-co-located (QCL) parameter as the reference signal (Q_new) selected or indicated by the higher layer before the terminal device receives a period of time related to beam failure recovery.
[0053]
​In this embodiment, the terminal device monitors and/or receives the downlink signal in the first cell according to the same antenna Quasi co-located (QCL) parameter as the reference signal Q_new indicated by the selected or higher layer, and refers to the terminal device switching the beam direction to a beam direction corresponding to the reference signal Q_new, thereby realizing the beam direction switching.
[0054]
​According to the present embodiment, after receiving a period of time in which a response (BFR response) related to beam failure recovery is received, the terminal device switches the beam direction, so that in a single carrier scenario, if the control channel resource of the response (BFR response) related to receiving the beam failure recovery is different from the control channel resource terminal device reset by the terminal device after receiving the response, the terminal device can perform corresponding signal processing in the period of time, so that there is enough time to adjust the direction of the beam, so that the beam direction can be reliably switched. In addition, in a scenario of multiple carriers (eg, more than two carriers), the terminal device can also reliably perform beam direction switching with sufficient time, thereby improving system performance.
[0055]
​FIG. 3 (A) is a schematic diagram of a beam failure recovery method applied to a single carrier scenario according to an embodiment. As shown in FIG. 3 (A), the terminal device receives a response (BFR response) related to beam failure recovery at time t1, and adjusts the antenna Quasi-co-located (QCL) parameter to be the same as the selected reference signal Q_new indicated by the selected or higher layer after a period of time k, and monitors and/or receives the downlink signal in the switched beam direction.
[0056]
​As shown in (A) in FIG. 3, in the case that the downlink control information (DCI) used when the beam failure is detected (DCI) is different from the downlink control information (DCI) used for receiving the beam failure recovery, the terminal device can perform corresponding signal processing in the period of time K, so that there is enough time to adjust the direction of the beam, so that in the time period K1, the downlink signal can be reliably monitored and/or received in the switched beam direction.​The signal processing performed by the terminal device in the period of time k may include, for example, demodulating the received BFR response, and then preparing the corresponding downlink receiving beam according to the reference signal Q_new.. Alternatively, after receiving the BFR response, the terminal device is configured to apply the time required by the QCL information corresponding to the Q_new.
[0057]
​As shown in FIG. 3 (A), the terminal device receives a cell of a response (BFR response) related to beam failure recovery and a cell that monitors and/or receives the downlink signal as the same cell, for example, the cell 300
[0058]
​FIG. 3 (B) is a schematic diagram of a beam failure recovery method applied to a multi-carrier scenario according to an embodiment. As shown in FIG. 3 (B), the terminal device receives a response (BFR response) related to beam failure recovery at time t1, and adjusts the antenna Quasi-co-located (QCL) parameter to be the same as the selected reference signal Q_new indicated by the selected or higher layer after a period of time k, and monitors and/or receives the downlink signal in the switched beam direction.
[0059]
​As shown in FIG. 3 (B), the terminal device may receive a BFR response related to beam failure recovery in the second cell 302, and listen and/or receive the downlink signal in the first cell 301. The second cell 302 and the first cell 301 May be different, for example, the second cell 302 is the primary cell PCell or the secondary cell SCell # 0, and the first cell 301 is the secondary cell SCell # 1.
[0060]
​As shown in (B) of FIG. 3, in the case that the first cell and the second cell are different, the terminal device can perform corresponding signal processing in the period of time k, so that there is enough time to adjust the direction of the beam, and therefore, in the time period K1, the downlink signal can be reliably monitored and/or received in the switched beam direction.. The signal processing performed by the terminal device in the period of time k may include, for example, demodulating the received BFR response, and then preparing the corresponding downlink receiving beam according to the reference signal Q_new.. Alternatively, after receiving the BFR response, the terminal device is configured to apply the time required by the QCL information corresponding to the Q_new.
[0061]
​In this embodiment, the first cell 301 and the second cell 302 belong to the same cell group, and the cell group may be, for example, a primary cell group (MCG) or a secondary cell group (SCG).
[0062]
​In this embodiment, the downlink signal monitored or received by the terminal device includes at least one of the following signals: a physical downlink control channel (PDCCH), a physical downlink data channel (PDSCH), a channel state information reference signal (CSI-RS), and a synchronization signal block (SSB). In addition, the present embodiment may not be limited thereto, and the downlink signal may also be another signal.
[0063]
​In the following description of this embodiment, the beam failure recovery method in this embodiment is illustrated by taking the downlink signal as a physical downlink control channel (PDCCH) and/or a physical downlink data channel (PDSCH) as an example.. In addition, for the description of the beam failure recovery method in the case that the downlink signal is a channel state information reference signal (CSI-RS) or a synchronization signal block (SSB), reference may be made to the description of a beam failure recovery method corresponding to a physical downlink control channel (PDCCH) or a physical downlink data channel (PDSCH).
[0064]
​In this embodiment, in the case that there is an opportunity for monitoring a physical downlink control channel (PDCCH) in the first cell, the terminal device can monitor the physical downlink control channel (PDCCH) in the first cell. For example, in the case that there is an opportunity for monitoring a physical downlink control channel (PDCCH) in the first cell, the terminal device monitors the physical downlink control channel (PDCCH) in the first cell, or monitors the physical downlink control channel (PDCCH) in the first cell and receives a physical downlink data channel (PDSCH).
[0065]
​In addition, if there is no opportunity for monitoring the physical downlink control channel (PDCCH) in the first cell, the terminal device does not monitor the physical downlink control channel (PDCCH) in the first cell.
[0066]
​In this embodiment, in the case that the terminal device monitors the physical downlink control channel (PDCCH) in the first cell, the control resource set (CORESET) or the search space corresponding to the PDCCH may satisfy at least one of the following conditions:
[0067]
​(1) all control resource sets (CORESETs) or all search spaces corresponding to the physical downlink control channel (PDCCH) on the activated bandwidth part (BWP) in the first cell 301;
[0068]
​(2) a control resource set (CORESET) or a search space corresponding to the physical downlink control channel (PDCCH) is a default control resource set (CORESET) or a search space, wherein the default control resource set (CORESET) or search space may be, for example, a control resource set (CORESET) or a search space with a minimum identification code (ID) or a maximum identification code (ID);
[0069]
​(3) The control resource set (CORESET) or search space corresponding to the physical downlink control channel (PDCCH) is a control resource set (CORESET) or search space indicated by radio resource control (RRC) signaling.
[0070]
​In this embodiment, the physical downlink data channel (PDSCH) received in the first cell by the terminal device may be at least one of the following:
[0071]
​(1) a physical downlink data channel (PDSCH) in the first cell, wherein the physical downlink data channel (PDSCH) may be predetermined, for example, all physical downlink data channels (PDSCH) in the first cell;
[0072]
​(2) in the case that there is an opportunity for monitoring a physical downlink control channel (PDCCH) in the first cell, a physical downlink data channel (PDSCH) scheduled by the monitored physical downlink control channel (PDCCH);
[0073]
​(3) a physical downlink data channel (PDSCH) scheduled by a physical downlink control channel (PDCCH) that receives the response (BFR response) related to beam failure recovery.
[0074]
​In this embodiment, a format of a response (BFR response) related to beam failure recovery may be, for example, a downlink control signaling (DCI) format scrambled by a cell radio network temporary identifier (C-RNTI); or a downlink control signaling (DCI) format that is modulated and scrambled with a coding policy cell radio network temporary identifier (MCS-C-RNTI).
[0075]
​In this embodiment, a response (BFR response) related to beam failure recovery is detected in a search space for a random access response (BFR RAR) for beam failure recovery, for example, a response (BFR response) related to beam failure recovery is a first physical downlink control channel (PDCCH) in the search space.
[0076]
​In this embodiment, the search space may be configured by a radio resource control (RRC) signaling, and the name of the radio resource control (RRC) signaling may be, for example, a recovery search space identifier (recovery search space ID). In addition, the search space may be a search space of the first cell 301, for example, a search space of the secondary cell SCell # 1; the search space may also be a search space of the second cell 302, for example, a search space of the primary cell PCell or a search space of the first secondary cell SCell # 0.
[0077]
​In the present embodiment, the length of the period of time k may be expressed as an absolute time, eg, 3 milliseconds (ms); or a number of slots or symbols associated with a subcarrier spacing (SCS), for example, k = 14 symbols for 15 kHz and 30 kHz, k = 28 symbols for 60 kHz and 120 kHz.. For another example, ​Symbol, where mu cell refers to a subcarrier spacing corresponding to the downlink signal, and mu 15 kHz refers to a subcarrier spacing corresponding to 15 kHz, M refers to a normalized length of K, M may be a natural number, such as M = 28, another example is, ​The MU DCI refers to a subcarrier spacing corresponding to the BFR response, and mu DL refers to a subcarrier spacing corresponding to the downlink signal, M refers to a normalized length of K, and M may be a natural number, such as M = 28.
[0078]
​In this embodiment, the subcarrier spacing (SCS) may include: a subcarrier spacing of the first cell 301; or, a subcarrier spacing of a cell where a response (BFR response) related to the beam failure recovery is received, for example, a subcarrier spacing of the second cell 302.
[0079]
​In this embodiment, the length of the time k may be related to the capability of the terminal device. The level of the capability of the terminal device is different, and the length of the corresponding time k (on the corresponding subcarrier) is also different, for example, the higher the capability of the terminal device, the faster the processing speed of the terminal device, the shorter the length of the corresponding time k.
[0080]
​In this embodiment, the starting point T1 of the period of time K may be any one of the following cases:
[0081]
​(1) receiving a slot of a response (BFR response) related to beam failure recovery;
[0082]
​(2) a last symbol of a response (BFR response) related to beam failure recovery;
[0083]
​(3) Receive the last symbol in the control resource set (CORESET) of the response (BFR response) related to beam failure recovery.
[0084]
​In this embodiment, the end point T2 of the period of time k may be any one of the following cases:
[0085]
​(1) a time slot for receiving the downlink signal, wherein if the downlink signal occupies only one slot in the time domain, the end point of the period of time k may be a time slot where the downlink signal is located; if the downlink signal occupies a plurality of time slots in the time domain (for example, the downlink signal is a PDSCH, the value of the RRC signaling PDSCH-Aggregate factor corresponding to the PDSCH transmission is greater than 1), the end point of the period of time k may be the first slot in the plurality of time slots;
[0086]
​(2) a first symbol of a downlink signal;
[0087]
​(3) a first symbol in a control resource set (CORESET) or a search space for monitoring the downlink signal, for example, a first symbol in a control resource set (CORESET) or a search space for monitoring a PDCCH.
[0088]
​The control resource set (CORESET) or the search space used for monitoring the PDCCH described above satisfies at least one of the following conditions:
[0089]
​(1) all control resource sets (CORESETs) or all search spaces corresponding to the physical downlink control channel (PDCCH) on the activated bandwidth part (BWP) in the first cell 301;
[0090]
​(2) a control resource set (CORESET) or a search space corresponding to the physical downlink control channel (PDCCH) is a default control resource set (CORESET) or a search space, wherein the default control resource set (CORESET) or search space may be, for example, a control resource set (CORESET) or a search space with a minimum identification code (ID) or a maximum identification code (ID);
[0091]
​(3) The control resource set (CORESET) or search space corresponding to the physical downlink control channel (PDCCH) is a control resource set (CORESET) or search space indicated by radio resource control (RRC) signaling.
[0092]
​In this embodiment, the activation or reconfiguration signaling received at time t2 May include: activation or reconfiguration signaling for the first cell 301; or, for activation or reconfiguration signaling of the second cell 302 associated with the first cell 301, wherein the second cell 302 May be a secondary cell SCell # 0, and the first cell 301 and the second cell 302 jointly perform a beam failure recovery (BFR) procedure, or jointly perform beam failure recovery measurement. Or, an activation or reconfiguration signaling for a primary cell PCell of the terminal device, wherein the primary cell PCell and the first cell 301 jointly perform beam failure recovery (BFR) procedure, or jointly perform beam failure recovery measurement.
[0093]
​In this embodiment, the activation or reconfiguration signaling may have a medium access control layer control unit (MAC-CE) signaling for activating a Transmission Configuration Indication (TCI) state of a control resource set (CORESET) corresponding to the downlink signal, where the downlink signal is, for example, a PDCCH. Or, a medium access control layer control unit (MAC-CE) signaling for activating a TCI state set corresponding to the downlink signal, where the downlink signal is, for example, a PDSCH; or​The Radio Resource Control (RRC) signaling for reconfiguring the TCI state set of the control resource set (CORESET) corresponding to the downlink signal is, for example, a PDCCH, and the radio resource control (RRC) signaling may be, for example, a TCI-Taatestesa, a TCI-Taatesbecan, or a TCI-Taatesce. Or a Radio Resource Control (RRC) signaling for reconfiguring a set of TCI states corresponding to the downlink signal, for example, a PDSCH, and the radio resource control (RRC) signaling may be, for example, a TCI-Ttaateskodak Odak Odak.​, or TCI-Taatesbeckorean Elemacheist.
[0094]
​In this embodiment, the first cell 301 May include a cell corresponding to the cell information reported by the terminal device to the network device, where the reporting of the cell information may occur after the beam failure, for example, the terminal device may report an identification code (ID) of the first cell 301, and the cell 301 is detected to send a beam failure. Or a cell associated with the second cell 302 corresponding to the cell information reported by the terminal device to the network device, for example, the terminal device may report an identification code (ID) of the second cell 302, the second cell 302 is associated with the first cell 301, and the cell 302 is detected to send a beam failure; or, the cell indicated by the higher layer of the terminal device, for example,​For example, the cell associated with the second cell 302 indicated by the medium access control (MAC) layer of the terminal device, for example, the secondary cell SCell # 1 associated with the beam failure indicated by the medium access control (MAC) layer of the terminal device; or, the cell associated with the second cell 302 of the BFR response associated with the beam failure recovery is received.
[0095]
​In this embodiment, the association between the second cell 302 and the first cell 301 May be configured by radio resource control (RRC) signaling, for example, the radio resource control (RRC) signaling configuration is used as the secondary cell SCell # 1 of the first cell 301 and the secondary cell SCell # 0 or the primary cell PCell serving as the second cell 302 for beam failure recovery (BFR).
[0096]
​In this embodiment, the reference signal Q_new may be a selected reference signal or a reference signal indicated by a higher layer. The selected reference signal Q_new may be a reference signal selected by the terminal device from a reference signal (RS) list comprising a group for determining a beam failure recovery candidate beam (BFR candidate beam); the reference signal indicated by the higher layer may be a reference signal indicated by a higher layer (eg, a MAC layer) of the terminal device in the last time to the physical layer.
[0097]
​In this embodiment, as shown in FIG. 2, the beam failure recovery method further includes:
[0098]
​Step 202: The terminal device reports information of the selected reference signal Q_new to the network device.
[0099]
​The information of the selected reference signal Q_new may be, for example, an identification code (ID) of the reference signal Q_new.
[0100]
​In step 202, the terminal device may report information of the selected reference signal Q_new to the network device through a medium access control layer control unit message (MAC-CE message), a physical uplink control channel (PUCCH), or a physical random access channel (PRACH).. The medium access control layer control unit message (MAC-CE message) may be sent through a physical uplink data channel (PUSCH); the information of Q_new may also be transmitted using a time-frequency resource position corresponding to the PUCCH, or a resource ID of the PUCCH; in addition, different PRACH resources may also be associated with different candidate RSs for BFR.​According to the corresponding RS resource of the transmitted PRACH resource, the network side may know the corresponding Q_new.
[0101]
​In one embodiment of the present embodiment, step 202 May be performed before step 201, for example.
[0102]
​In this embodiment, the first cell 301 May not be configured to receive a random access response (RAR) search space related to beam failure recovery, in this case, the terminal device may perform beam failure recovery in the manner shown in (B) of FIG. 3, and receive a response (BFR response) related to beam failure recovery in the second cell 302.
[0103]
​In addition, in this embodiment, the first cell 301 May also be configured to receive a random access response (RAR) search space of a response (BFR response) related to beam failure recovery, in which case:
[0104]
​The terminal device may perform beam failure recovery in the manner shown in (A) of FIG. 3, that is, receive a BFR response related to beam failure recovery in the same cell, monitor and/or receive a downlink signal, and monitor and/or receive a downlink signal in a time period K1 before the terminal device receives a response (BFR response) related to beam failure recovery until a time period K1 before activation or reconfiguration signaling T2 is received;
[0105]
​Alternatively, the terminal device may receive a BFR response related to beam failure recovery in the same cell, monitor and/or receive the downlink signal, and monitor and/or receive the downlink signal after the terminal device receives the response (BFR response) related to the beam failure recovery, that is, the search space used by the PDCCH is monitored and/or received, that is, the search space used for monitoring the PDCCH is the same as the search space used for receiving the BFR response
[0106]
​According to the present embodiment, after a period of time of receiving a response (BFR response) related to beam failure recovery, the terminal device switches the beam direction, so that in a single carrier scenario, if the control channel resource of the response (BFR response) related to the beam failure recovery is different from the control channel resource reset by the terminal device after receiving the response, the terminal device can perform corresponding signal processing in the period of time, so that there is enough time to adjust the direction of the beam, so that the beam direction can be reliably switched. In addition, in a scenario of multiple carriers (eg, more than two carriers), the terminal device can also reliably perform beam direction switching with sufficient time, thereby improving system performance.
[0107]
​Embodiment 2
[0108]
​Embodiment 2 provides a beam failure recovery apparatus.. Since the principle of the apparatus to solve the problem is similar to the method of Embodiment 1, the specific implementation thereof May refer to the implementation of the method of Embodiment 1, and the same is not repeated here.
[0109]
​FIG. 4 is a schematic diagram of a beam failure recovery apparatus according to Embodiment 2 of the present disclosure.. As shown in FIG. 4, the apparatus 400 includes a receiving unit 401
[0110]
​In this embodiment, after the terminal device receives a period of time k related to the beam failure recovery, the receiving unit 401 May monitor and/or receive the downlink signal in the first cell of the terminal device according to the same antenna Quasi co-located (QCL) parameter as the reference signal Q_new or the reference signal Q_new indicated by the higher layer.
[0111]
​In this embodiment, the downlink signal includes at least one of the following signals:
[0112]
​a physical downlink control channel (PDCCH), a physical downlink data channel (PDSCH), a channel state information reference signal (CSI-RS), and a synchronization signal block (SSB).
[0113]
​In this embodiment, in the case that there is an opportunity for monitoring the physical downlink control channel (PDCCH) in the first cell, the receiving unit 401 monitors the physical downlink control channel (PDCCH) in the first cell.
[0114]
​In this embodiment, in the case that the terminal device monitors the physical downlink control channel (PDCCH) in the first cell, the control resource set (CORESET) or the search space corresponding to the PDCCH may satisfy at least one of the following conditions:
[0115]
​(1) all control resource sets (CORESETs) or all search spaces corresponding to the physical downlink control channel (PDCCH) on the activated bandwidth part (BWP) in the first cell 301;
[0116]
​(2) a control resource set (CORESET) or a search space corresponding to the physical downlink control channel (PDCCH) is a default control resource set (CORESET) or a search space, wherein the default control resource set (CORESET) or search space may be, for example, a control resource set (CORESET) or a search space with a minimum identification code (ID) or a maximum identification code (ID);
[0117]
​(3) The control resource set (CORESET) or search space corresponding to the physical downlink control channel (PDCCH) is a control resource set (CORESET) or search space indicated by radio resource control (RRC) signaling.
[0118]
​In this embodiment, the physical downlink data channel (PDSCH) comprises:
[0119]
​A Physical Downlink Data Channel (PDSCH) in the first cell; or when there is an opportunity for monitoring the physical downlink control channel (PDCCH) in the first cell, a physical downlink data channel (PDSCH) scheduled by the monitored physical downlink control channel (PDCCH); or, a physical downlink data channel (PDSCH) scheduled by the physical downlink control channel (PDCCH) receiving the response (BFR response) related to the beam failure recovery.
[0120]
​In this embodiment, a format of a response (BFR response) related to beam failure recovery may be, for example, a cell radio network temporary identifier (C-RNTI) format, or a downlink control signaling (DCI) format that is modulated and scrambled with a coding policy cell radio network temporary identifier (MCS-C-RNTI).
[0121]
​In this embodiment, the response (BFR response) related to beam failure recovery is detected in a search space for a random access response (BFR RAR) for beam failure recovery. The BFR response related to the beam failure recovery is the first physical downlink control channel (PDCCH) in the search space.
[0122]
​In the present embodiment, the period of time k may be expressed as: an absolute time; or a number of time slots or symbols related to a subcarrier spacing.
[0123]
​The subcarrier spacing includes: a subcarrier spacing of the first cell; or, a subcarrier spacing of a cell where a response (BFR response) related to beam failure recovery is received.
[0124]
​In this embodiment, the length of the time k is related to the performance of the terminal device. For example, the higher the performance level of the terminal device, the shorter the time k.
[0125]
​In this embodiment, the start point T1 of the period of time is: a slot in which the terminal device receives a response (BFR response) related to beam failure recovery; or, a last symbol of a response (BFR response) related to beam failure recovery; or, the terminal device receives a last symbol in a control resource set (CORESET) of a response (BFR response) related to beam failure recovery.
[0126]
​In this embodiment, the end point T2 of the period of time is: a slot for receiving the downlink signal; or, a first symbol in a control resource set (CORESET) or a search space for monitoring the downlink signal (eg, PDCCH); or, a first symbol of the downlink signal.
[0127]
​When the downlink signal is a physical downlink control channel (PDCCH), the control resource set (CORESET) or search space used for monitoring the downlink signal satisfies at least one of the following conditions:
[0128]
​All control resource sets (CORESETs) or all search spaces corresponding to the physical downlink control channel (PDCCH) on the activated bandwidth part (BWP) in the first cell 301;
[0129]
​a control resource set (CORESET) or a search space corresponding to a physical downlink control channel (PDCCH) is a default control resource set (CORESET) or a search space;
[0130]
​The control resource set (CORESET) or search space corresponding to the physical downlink control channel (PDCCH) is a control resource set (CORESET) or search space indicated by radio resource control (RRC) signaling.
[0131]
​In this embodiment, the activation or reconfiguration signaling may be: activation or reconfiguration signaling for the first cell; or activation or reconfiguration signaling for a second cell associated with the first cell; or activation or reconfiguration signaling for the primary cell of the terminal device.
[0132]
​In this embodiment, the activation or reconfiguration signaling may be used to: activate the MAC-CE signaling of the TCI state of the control resource set (CORESET) corresponding to the downlink signal. Or, activating MAC-CE signaling of a TCI state set corresponding to the downlink signal; or reconfiguring radio resource control (RRC) signaling of a TCI state set of a control resource set (CORESET) corresponding to the downlink signal; or reconfiguring radio resource control (RRC) signaling of a TCI state set corresponding to the downlink signal.
[0133]
​In this embodiment, the first cell includes a cell corresponding to the cell information reported by the terminal device to the network device; or a cell associated with the cell corresponding to the cell information reported by the terminal device to the network device; or, a cell indicated by a higher layer of the terminal device; or, a cell associated with the cell indicated by the higher layer of the terminal device; or, receiving a cell associated with the cell of the beam failure recovery related cell.
[0134]
​In this embodiment, the cell information corresponding to the cell information reported by the terminal device to the network device, and the association relationship between cells associated with the cell are configured by radio resource control (RRC) signaling.
[0135]
​In this embodiment, a cell indicated by a higher layer of the terminal device and an association relationship between cells associated with the cell are configured by radio resource control (RRC) signaling
[0136]
​In this embodiment, the selected reference signal (Q_new) is selected from a list comprising a set of reference signal (RS) for determining a beam failure recovery candidate beam (BFR candidate beam). The reference signal indicated by the higher layer is the reference signal (Q_new) that is most recently indicated by the higher layer (eg, the MAC layer of the terminal device).
[0137]
​As shown in FIG. 4, the apparatus 400 May further include a sending unit 402
[0138]
​The sending unit 402 is configured to report information of the selected reference signal Q_new to the network device.
[0139]
​For example, the sending unit 402 reports information of the selected reference signal (Q_new) to the network device through a MAC-CE message, a physical uplink control channel (PUCCH), or a physical random access channel (PRACH).
[0140]
​The information of the selected reference signal Q_new may be, for example, an identification code of the selected reference signal Q_new.
[0141]
​In this embodiment, the first cell may have no RAR search space configured to receive a response (BFR response) related to beam failure recovery.
[0142]
​In addition, in this embodiment, the first cell may also be configured to receive an RAR search space of a response (BFR response) related to beam failure recovery.
[0143]
​According to the present embodiment, after receiving a period of time of a response (BFR response) related to beam failure recovery, the terminal device switches the beam direction, so that the terminal device can reliably switch the beam direction with sufficient time, thereby improving system performance.
[0144]
​Embodiment 3
[0145]
​Embodiment 3 provides a terminal device. Since the principle of the device solution is similar to the method of Embodiment 1, the specific implementation thereof May be implemented with reference to the method of Embodiment 1, and the contents thereof are not repeated here.
[0146]
​FIG. 5 is a schematic structural diagram of a terminal device according to an embodiment of this application.. As shown in FIG. 5, the terminal device 500 May include a central processing unit (CPU) 501 and a memory 502; the memory 502 is coupled to the central processor 501, wherein the memory 502 May store various data; and in addition, a program for data processing is stored, and the program is executed under the control of the central processor 501 to instruct the terminal device according to the received signaling.
[0147]
​In one embodiment, the functionality of the apparatus 400 of Example 2 May be integrated into a central processor 501 of the terminal device 500. The central processing unit 501 May be configured to implement the beam failure recovery method according to Embodiment 1.
[0148]
​For example, the central processing unit 501 May be configured to perform control, so that the terminal device 500 executes the method of Embodiment 1.
[0149]
​In addition, other configurations of the central processor 501 May refer to Embodiment 1, and details are not described herein again.
[0150]
​In another embodiment, the apparatus 400 May be separately configured with the central processor 501, for example, the apparatus 400 May be configured as a chip connected to the central processing unit 501, such as the unit shown in FIG. 5, and the function of the apparatus 400 is realized by the control of the central processing unit 501.
[0151]
​In addition, as shown in FIG. 5, the terminal device 500 May further have a communication module 503, an input unit 504, a display 506, an audio processor 505, an antenna 507, and a power supply 508.
[0152]
​According to the present embodiment, the terminal device can reliably perform beam direction switching with sufficient time, thereby improving system performance.
[0153]
​Embodiment 4
[0154]
​Embodiment 4 of the present application provides a beam failure recovery method, and the method may be performed by a network device.
[0155]
​FIG. 6 is a schematic diagram of a beam failure recovery method according to an embodiment, as shown in FIG. 6, the method includes:
[0156]
​Step 601: A network device sends, to a terminal device, first signaling associated with a beam failure recovery process between two or more cells of the terminal device.
[0157]
​The first signaling in step 601 May be, for example, RRC signaling or the like.
[0158]
​According to the present embodiment, the network device may associate two or more carriers through the first signaling, so that their beam failure recovery (BFR) processes are associated. Thus, the carriers (with similar spatial characteristics) may be measured by the BFR using the same reference signal (RS), and when a beam failure occurs and the terminal device recovers from the beam failure (after the reception of BFR response), the terminal device may reset the downlink signal receiving space direction of the carrier indicated by the first signaling.. Therefore, the problem that the terminal device and the network device may interact too frequently when beam failure measurement and recovery are performed on each sub-carrier are avoided.
[0159]
​In this embodiment, as shown in FIG. 6, the method may further include:
[0160]
​Step 602: The network device sends a BFR response related to the beam failure recovery to the terminal device.
[0161]
​In this embodiment, when the terminal device determines that the beam fails, and the beam failure request is sent to the network device, the network device may send a BFR response related to the beam failure recovery to the terminal device.
[0162]
​After receiving the period of time K related to the beam failure recovery, the terminal device may monitor and/or receive the downlink signal in the first cell of the terminal device according to the same antenna Quasi co-located (QCL) parameter as the selected reference signal (Q_new) or the reference signal (Q_new) indicated by the higher layer.. For a detailed description of monitoring and/or receiving a downlink signal by the terminal device, reference may be made to Embodiment 1.
[0163]
​Embodiment 5
[0164]
​Embodiment 5 of the present application provides a beam failure recovery method, and the method may be performed by a network device.
[0165]
​FIG. 7 is another schematic diagram of a beam failure recovery method according to an embodiment, as shown in FIG. 7, the method may include:
[0166]
​Step 603: The network device sends, to the terminal device, a cell for indicating monitoring and/or receiving a downlink signal, and/or a bandwidth part, and/or a control resource set (CORESET) or a second signaling of the search space.
[0167]
​The second signaling in step 603 May be, for example, RRC signaling or the like.
[0168]
​The terminal device may receive the downlink signal according to the indication of the second signaling.
[0169]
​The second signaling includes a cell, and/or a BWP, and/or a mapping relationship between the control resource set (CORESET) or the search space.. The terminal device may then receive the downlink signal on the corresponding CORESET or search space according to the mapping relationship, the cell information indicated by the higher layer signaling, and the activated BWP on the cell.. For example, the second signaling includes the following mapping relationship:
[0170]
​Mapping relationship 1 cell # 1 → BWP # 1 → CORESET # 2
[0171]
​mapping relationship 2 cell # 1 → BWP # 2 → CORESET # 4
[0172]
​mapping relationship 3 cell # 3 → BWP # 1 → CORESET # 1
[0173]
​Based on the above mapping relationship 1, when the terminal device receives an indication of a cell (cell ID = 1), and the activated BWP of the cell is BWP # 1, the terminal device receives the PDCCH in the CORESET # 2 of the BWP # 1 of the cell # 1, that is, the PDCCH is received according to the QCL parameter of the Q_new.
[0174]
​Based on the foregoing mapping relationship 2, when the terminal device receives an indication of a cell (cell ID = 1), and the activated BWP of the cell is BWP # 2, the terminal device receives the PDCCH in the CORESET # 4 of the BWP # 2 of the cell # 1, that is, the PDCCH is received according to the QCL parameter of the Q_new.
[0175]
​Based on the above mapping relationship 3, when the terminal device receives an indication of the cell with respect to the higher layer (cell ID = 3), and the activated BWP of the cell is BWP # 1, the terminal device receives the PDCCH in the CORESET # 1 of the BWP # 1 of the cell # 3, that is, the PDCCH is received according to the QCL parameter of the Q_new.
[0176]
​In this embodiment, as shown in FIG. 7, the method may further include:
[0177]
​Step 602: The network device sends a BFR response related to the beam failure recovery to the terminal device.
[0178]
​For illustration of step 602, reference may be made to the description of Embodiment 4 above
[0179]
​In one embodiment of the present embodiment, step 603 May be performed before step 602, for example.
[0180]
​Embodiment 6
[0181]
​Embodiment 6 provides a beam failure recovery apparatus.. Since the principle of the apparatus to solve the problem is similar to the method of Embodiment 4, the specific implementation thereof May refer to the implementation of the method of Embodiment 4, and the contents are not repeated here.
[0182]
​FIG. 8 is a schematic diagram of a beam failure recovery apparatus according to Embodiment 6 of the present disclosure.. As shown in FIG. 8, the apparatus 700 includes a first indicating unit 701
[0183]
​The first indication unit 701 sends, to the terminal device, first signaling indicating that beam failure recovery is jointly performed between two or more cells of the terminal device.
[0184]
​Thus, carriers with similar spatial characteristics may be measured using the same reference signal (RS), and when a beam failure occurs and the terminal device recovers from the beam failure (after the reception of BFR response), the terminal device may reset the downlink signal receiving space direction of the plurality of carriers at the same time.. Therefore, the problem that the terminal device and the network device may interact too frequently when beam failure measurement and recovery are performed on each sub-carrier are avoided.
[0185]
​As shown in FIG. 8, the apparatus 700 further includes:
[0186]
​The third indication unit 703 is configured to send a BFR response related to the beam failure recovery to the terminal device.
[0187]
​In this embodiment, when the terminal device determines that the beam fails, and the beam failure request is sent to the network device, the network device may send a BFR response related to the beam failure recovery to the terminal device.
[0188]
​Embodiment 7
[0189]
​Embodiment 7 provides a beam failure recovery apparatus.. Since the principle of the apparatus to solve the problem is similar to the method of Embodiment 5, the specific implementation thereof May refer to the implementation of the method of Embodiment 5, and the contents are not repeated here.
[0190]
​FIG. 9 is a schematic diagram of a beam failure recovery apparatus according to Embodiment 7 of the present disclosure.. As shown in FIG. 9, the apparatus 700 A includes:
[0191]
​The second indication unit 702 is configured to send, to the terminal device, signaling for indicating to monitor and/or receive a downlink signal, and/or a bandwidth part, and/or a control resource set (CORESET) or search space.
[0192]
​The terminal device may determine, according to the indication of the second signaling, which cell, which BWP, which control resource set (CORESET) or search space is to receive the downlink signal.
[0193]
​For example, the second signaling includes a cell, and/or a BWP, and/or a mapping relationship between a control resource set (CORESET) or a search space. The terminal device may then receive the downlink signal on the corresponding CORESET or search space according to the mapping relationship, the cell information indicated by the higher layer signaling, and the activated BWP on the cell.
[0194]
​In addition, as shown in FIG. 9, the apparatus 700 A further includes:
[0195]
​The third indication unit 703 is configured to send a BFR response related to the beam failure recovery to the terminal device.
[0196]
​The description of the third indication unit 703 is the same as the above embodiment 6.
[0197]
​Embodiment 8
[0198]
​Embodiment 8 provides a network device. Since the principle of the device solution is similar to the method of Embodiment 4 or 5, the specific implementation thereof May be implemented with reference to the method of Embodiment 4 or 5, and the contents thereof are not repeated here.
[0199]
​FIG. 8 is a schematic diagram of a network device according to an embodiment of the present invention.. As shown in FIG. 8, the terminal device 800 May include a central processing unit (CPU) 801 and a memory 802. The memory 802 is coupled to the central processing unit 801. The memory 802 May store various data
[0200]
​In one embodiment, the functionality of the apparatus 700 or 700 A of Embodiment 6 or 7 May be integrated into the central processor 801. The central processing unit 801 May be configured to implement the method according to Embodiment 4 or 5.
[0201]
​For example, the central processing unit 801 May be configured to perform control to cause the network device 800 to perform the method according to Embodiment 4 or 5.
[0202]
​In addition, other configurations of the central processor 801 May refer to embodiment 4 or 5, and details are not described herein again.
[0203]
​In another embodiment, the apparatus 700 or 700A may be configured separately from the central processor 801, for example, the apparatus 700 or 700A may be configured as a chip connected to the central processor 801, and as shown in FIG. 8, the apparatus 700 or 700A may be implemented by controlling the central processor 801.
[0204]
​In addition, as shown in FIG. 8, the terminal device 800 May further include a transceiver 803, an antenna 804, a display, an audio processor, and a power supply. The functions of the foregoing components are similar to those of the prior art, and details are not described herein again.. It should be noted that the network device 800 is not necessarily all the components shown in FIG. 8; in addition, the network device 800 May further include the components not shown in FIG. 8, and may refer to the prior art.
[0205]
​Embodiment 9
[0206]
​Embodiment 9 provides a communication system, which at least includes the network device in Embodiment 8 and the content of Embodiment 3 and Embodiment 8 of the terminal device 500 in Embodiment 3, and details are not described herein again.
[0207]
​An embodiment of the present invention further provides a storage medium storing a computer readable program, wherein the computer readable program causes a beam failure recovery apparatus or a terminal device to perform the beam failure recovery method according to Embodiment 1.
[0208]
​An embodiment of the present invention further provides a computer readable program, wherein when the program is executed in a beam failure recovery apparatus or a terminal device, the program causes the beam failure recovery apparatus or the terminal device to perform the beam failure recovery method according to Embodiment 1.
[0209]
​An embodiment of the present invention further provides a storage medium storing a computer readable program, wherein the computer readable program causes a beam failure recovery apparatus or a network device to perform the beam failure recovery method according to Embodiment 4 or 5.
[0210]
​Embodiments of the present invention further provide a computer readable program, wherein when the program is executed in a beam failure recovery apparatus or a network device, the program causes the beam failure recovery apparatus or the network device to perform the beam failure recovery method according to Embodiment 4 or 5.
[0211]
​The above apparatus and method of the present invention may be implemented by hardware, or may be implemented by hardware in combination with software. The present invention relates to a computer readable program that, when executed by a logic component, enables the logic to implement the apparatus or constituent components described above, or to enable the logic to implement the various methods or steps described above.. The present invention also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a Flash memory, etc.
[0212]
​The processing methods described in connection with the embodiments of the present disclosure may be embodied directly as hardware, a software module executed by a processor, or a combination of the two. For example, one or more combinations of one or more of the functional blocks shown in FIGS. 4, 8, and 9 May correspond to various software modules of a computer program flow, or may correspond to various hardware modules. These software modules may correspond to the various steps shown in FIG. 2, respectively. These hardware modules may, for example, be implemented using a field programmable gate array (FPGA) to cure these software modules.
[0213]
​A software module may be located in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. A storage medium may be coupled to the processor, so that the processor can read information from the storage medium and write information to the storage medium; or the storage medium may be an integral part of the processor. The processor and the storage medium may be located in an ASIC. The software module may be stored in a memory of the mobile terminal, or may be stored in a memory card that can be inserted into the mobile terminal.​For example, if a device (eg, a mobile terminal) uses a MEGA-SIM card or a large-capacity flash memory device with a larger capacity, the software module may be stored in the MEGA-SIM card or a large-capacity flash memory device.
[0214]
​One or more combinations of one or more of the functional block diagrams described with respect to FIGS. 4, 8, and 9 May be implemented as a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, or any suitable combination thereof for performing the functions described herein. One or more combinations of one or more of the functional block diagrams described with respect to FIGS. 4, 8, and 9 May also be implemented as a combination of computing devices, eg, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in communication with a DSP, or any other such configuration.
[0215]
​The present invention has been described above in conjunction with specific embodiments, but it should be clear to those skilled in the art that these descriptions are exemplary and are not intended to limit the scope of the present invention.. Various variations and modifications can be made to the invention by those skilled in the art in accordance with the principles of the invention, which are also within the scope of the invention.
[0216]
​The present application also provides the following additional notes:
[0217]
1. ​A beam failure recovery method, applied to a terminal device, the method comprising:
[0218]
​After the terminal device receives a period of time related to beam failure recovery, the terminal device monitors and/or receives the downlink signal in the first cell according to the same antenna Quasi co-located (QCL) parameter as the selected reference signal (Q_new) or the reference signal (Q_new) indicated by the higher layer.
[0219]
2. ​The method of Annex 1, wherein
[0220]
​The downlink signal includes at least one of the following signals:
[0221]
​a physical downlink control channel (PDCCH), a physical downlink data channel (PDSCH), a channel state information reference signal (CSI-RS), and a synchronization signal block (SSB).
[0222]
3. ​The method of Annex 2, wherein
[0223]
​In the case where there is an opportunity for monitoring the physical downlink control channel (PDCCH) in the first cell, the terminal device monitors the physical downlink control channel (PDCCH) in the first cell.
[0224]
4. ​The method of Annex 2, wherein
[0225]
​The physical downlink data channel (PDSCH) comprises:
[0226]
​a Physical Downlink Data Channel (PDSCH) in the first cell; or
[0227]
​in the case where there is an opportunity for monitoring the physical downlink control channel (PDCCH) in the first cell, a physical downlink data channel (PDSCH) scheduled by the monitored physical downlink control channel (PDCCH); or
[0228]
​a physical downlink data channel (PDSCH) scheduled by a physical downlink control channel (PDCCH) that receives the response (BFR response) related to beam failure recovery.
[0229]
5. ​Method according to any one of the appended claims 1 to 4,
[0230]
​The BFR response related to beam failure recovery has a cell radio network temporary identity (C-RNTI), or a downlink control signaling (DCI) format that is modulated and scrambled with a coding policy cell radio network temporary identity (MCS-C-RNTI).
[0231]
6. ​Method according to any one of the appended claims 1 to 5,
[0232]
​The response (BFR response) related to beam failure recovery is detected in a search space for a random access response (BFR RAR) for beam failure recovery.
[0233]
7. ​The method of Annex 6, wherein
[0234]
​The BFR response related to the beam failure recovery is the first physical downlink control channel (PDCCH) in the search space.
[0235]
8. ​Method according to any one of the appended claims 1 to 7,
[0236]
​The period of time is expressed as:
[0237]
​absolute time; or
[0238]
​Number of time slots or symbols associated with subcarrier spacing
[0239]
9. ​The method of Annex 8, wherein
[0240]
​The subcarrier spacing includes:
[0241]
​a subcarrier spacing of the first cell; or
[0242]
​receive the subcarrier spacing of the cell where the response (BFR response) related to the beam failure recovery is located.
[0243]
10. ​The method of Annex 8, wherein
[0244]
​The length of the period of time is related to the performance of the terminal device
[0245]
11. ​Method according to any one of the appended claims 1 to 10,
[0246]
​The starting point (T1) of the period of time is:
[0247]
​receive a slot of a response (BFR response) related to beam failure recovery; or
[0248]
​a last symbol of a response (BFR response) related to beam failure recovery; or
[0249]
​The last symbol in the control resource set (CORESET) of the response (BFR response) related to beam failure recovery is received.
[0250]
12. ​Method according to any one of the appended claims 1 to 11,
[0251]
​The end point (T2) of the period of time is:
[0252]
​a slot for receiving the downlink signal; or
[0253]
​a first symbol in a control resource set (CORESET) or a search space for monitoring the downlink signal; or
[0254]
​a first symbol of the downlink signal.
[0255]
13. ​The method according to any one of claims 1 to 12, wherein the downlink signal comprises a physical downlink control channel (PDCCH), and is configured to monitor a control resource set (CORESET) or a search space of the downlink signal to satisfy at least one of the following conditions:
[0256]
​all control resource sets (CORESETs) or all search spaces corresponding to the physical downlink control channel (PDCCH) on the activated bandwidth part (BWP) in the first cell;
[0257]
​a control resource set (CORESET) or a search space corresponding to the physical downlink control channel (PDCCH) is a default control resource set (CORESET) or a search space;
[0258]
​The control resource set (CORESET) or search space corresponding to the physical downlink control channel (PDCCH) is a control resource set (CORESET) or search space indicated by radio resource control (RRC) signaling.
[0259]
14. ​Method according to any one of the appended claims 1 to 13,
[0260]
​The activation or reconfiguration signaling includes:
[0261]
​Activation or reconfiguration signaling for the first cell; or
[0262]
​Activation or reconfiguration signaling for a second cell associated with the first cell; or
[0263]
​ACTIVATION OR RECONFIGURATION SIGNALING FOR A PRIMARY CELL OF THE TERMINAL DEVICE
[0264]
15. ​Method according to any one of the appended claims 1 to 14,
[0265]
​The activation or reconfiguration signaling includes:
[0266]
​MAC-CE signaling for activating a TCI state of a control resource set (CORESET) corresponding to the downlink signal; or
[0267]
​MAC-CE signaling for activating a TCI state set corresponding to the downlink signal; or
[0268]
​radio resource control (RRC) signaling for reconfiguring a TCI state set of a control resource set (CORESET) corresponding to the downlink signal; or
[0269]
​Radio Resource Control (RRC) signaling for reconfiguring the TCI state set corresponding to the downlink signal.
[0270]
16. ​Method according to any one of the appended claims 1 to 15,
[0271]
​The first cell includes:
[0272]
​a cell corresponding to cell information reported by the terminal device to a network device; or
[0273]
​a cell associated with a cell corresponding to cell information reported by the terminal device to a network device; or
[0274]
​a cell indicated by a higher layer of the terminal device; or
[0275]
​a cell associated with a cell indicated by a higher layer of the terminal device; or
[0276]
​receive a cell associated with a cell of the beam failure recovery-related response (BFR response).
[0277]
17. ​The method of Annex 16, wherein
[0278]
​A cell corresponding to cell information reported by the terminal device to a network device, and an association relationship between cells associated with the cell are configured by radio resource control (RRC) signaling.
[0279]
18. ​The method of Annex 16, wherein
[0280]
​A cell indicated by a higher layer of the terminal device, and an association relationship between cells associated with the cell is configured by a radio resource control (RRC) signaling.
[0281]
19. ​Method according to any one of the appended claims 1 to 18,
[0282]
​The selected reference signal (Q_new) is selected from a list comprising a set of reference signals (RS) for determining a beam failure recovery candidate beam (BFR candidate beam).
[0283]
20. ​The method according to any one of the appended claims 1 to 19, wherein the method further comprises:
[0284]
​The terminal device reports information of the selected reference signal (Q_new) to the network device.
[0285]
21. ​The method of Annex 20, wherein
[0286]
​The terminal device reports information of the selected reference signal (Q_new) to the network device through a MAC-CE message, a physical uplink control channel (PUCCH), or a physical random access channel (PRACH).
[0287]
22. ​Method according to any one of the appended claims 1 to 21,
[0288]
​The reference signal indicated by the higher layer is the reference signal (Q_new) which is recently indicated by the higher layer.
[0289]
23. ​Method according to any one of the appended claims 1 to 22,
[0290]
​The first cell has no RAR search space configured to receive a response (BFR response) related to beam failure recovery.
[0291]
24. ​Method according to any one of the appended claims 1 to 22,
[0292]
​The first cell is configured to receive an RAR search space for a response (BFR response) related to beam failure recovery.
[0293]
25. ​A beam failure recovery method, applied to a network device, the method comprising:
[0294]
​The network device sends, to the terminal device, first signaling indicating that beam failure recovery is jointly performed between two or more cells of the terminal device.
[0295]
26. ​A beam failure recovery method, applied to a network device, the method comprising:
[0296]
​The network device sends, to the terminal device, a cell for indicating monitoring and/or receiving a downlink signal, and/or a bandwidth part (BWP), and/or a second signaling of a control resource set (CORESET).
[0297]
27. ​The method of Annex 26, wherein
[0298]
​The second signaling includes a cell, and/or a BWP, and/or a mapping relationship between a control resource set (CORESET) or a search space.
[0299]
28. ​The method according to any one of the appended claims 25 to 27, wherein the method further comprises:
[0300]
​sending, by the network device, a BFR response related to beam failure recovery to the terminal device.
​Claims
​[Claim 1]
​A beam failure recovery apparatus, provided in a terminal device, the apparatus comprising: a receiving unit configured to monitor and/or receive a downlink signal in a first cell of the terminal device according to a Quasi-co-located (QCL) parameter in a first cell of the terminal device according to an antenna Quasi co-located (QCL) parameter that is the same as the selected reference signal (Q_new) or the reference signal (Q_new) indicated by the higher layer before the terminal device receives a response (BFR response) related to beam failure recovery.
​[Claim 2]
​The apparatus of claim 1, wherein the downlink signal comprises at least one of a physical downlink control channel (PDCCH), a physical downlink data channel (PDSCH), a channel state information reference signal (CSI-RS), and a synchronization signal block (SSB).
​[Claim 3]
​The apparatus according to claim 2, wherein in a case where there is an opportunity for monitoring the physical downlink control channel (PDCCH) in the first cell, the receiving unit monitors the physical downlink control channel (PDCCH) in the first cell.
​[Claim 4]
​The apparatus of claim 2, wherein the physical downlink data channel (PDSCH) comprises: a physical downlink data channel (PDSCH) in the first cell; or when there is an opportunity for monitoring the physical downlink control channel (PDCCH) in the first cell, a physical downlink data channel (PDSCH) scheduled by the monitored physical downlink control channel (PDCCH); or a physical downlink data channel (PDSCH) scheduled by a physical downlink control channel (PDCCH) that receives the response (BFR response) related to the beam failure recovery.
​[Claim 5]
​The apparatus of claim 1, wherein the response to beam failure recovery (BFR response) has a cell radio network temporary identity (C-RNTI), or a downlink control signaling (DCI) format that is modulated and scrambled with a coding policy cell radio network temporary identity (MCS-C-RNTI).
​[Claim 6]
​The apparatus of claim 1, wherein the response to beam failure recovery (BFR response) is detected in a search space for a random access response (BFR RAR) for beam failure recovery.
​[Claim 7]
​The apparatus of claim 6, wherein the response to beam failure recovery (BFR response) is a first physical downlink control channel (PDCCH) in the search space.
​[Claim 8]
​The apparatus of claim 1, wherein the period of time is expressed as: an absolute time; or a number of time slots or symbols associated with a subcarrier spacing.
​[Claim 9]
​The apparatus according to claim 8, wherein the subcarrier spacing comprises: a subcarrier spacing of the first cell; or, a subcarrier spacing of a cell where the response (BFR response) related to the beam failure recovery is located.
​[Claim 10]
​The apparatus according to claim 1, wherein the start point (T1) of the period of time is: a slot in which the terminal device receives a response (BFR response) related to beam failure recovery; or a last symbol of a response (BFR response) related to beam failure recovery; or the terminal device receives a last symbol in a control resource set (CORESET) of a response (BFR response) related to beam failure recovery.
​[Claim 11]
​The apparatus of claim 1, wherein the end point (T2) of the period of time is: a slot for receiving the downlink signal; or a first symbol in a control resource set (CORESET) or a search space for monitoring the downlink signal; or a first symbol of the downlink signal.
​[Claim 12]
​The apparatus according to claim 1, wherein the downlink signal comprises a physical downlink control channel (PDCCH), and the control resource set (CORESET) or the search space for monitoring the downlink signal satisfies at least one of the following conditions: all control resource sets (CORESETs) or all search spaces corresponding to the physical downlink control channel (PDCCH) on an activated bandwidth part (BWP) in the first cell.​a control resource set (CORESET) or a search space corresponding to the physical downlink control channel (PDCCH) is a default control resource set (CORESET) or a search space; a control resource set (CORESET) or search space corresponding to the physical downlink control channel (PDCCH) is a control resource set (CORESET) or search space indicated by a radio resource control (RRC) signaling.
​[Claim 13]
​The apparatus of claim 1, wherein the activation or reconfiguration signaling comprises: activation or reconfiguration signaling for the first cell; or activation or reconfiguration signaling for a second cell associated with the first cell; or activation or reconfiguration signaling for a primary cell of the terminal device.
​[Claim 14]
​The apparatus according to claim 1, wherein the activation or reconfiguration signaling comprises: MAC-CE signaling for activating a TCI state of a control resource set (CORESET) corresponding to the downlink signal. Or MAC-CE signaling for activating a TCI state set corresponding to the downlink signal; or radio resource control (RRC) signaling for reconfiguring a TCI state set of a control resource set (CORESET) corresponding to the downlink signal; or radio resource control (RRC) signaling for reconfiguring a TCI state set corresponding to the downlink signal.
​[Claim 15]
​The apparatus according to claim 1, wherein the first cell comprises: a cell corresponding to cell information reported by the terminal device to a network device. Or a cell associated with a cell corresponding to cell information reported by the terminal device to a network device; or a cell indicated by a higher layer of the terminal device; or a cell associated with a cell indicated by a higher layer of the terminal device; or receiving a cell associated with a cell of the beam failure recovery related cell.
​[Claim 16]
​The apparatus of claim 1, wherein the reference signal indicated by the higher layer is a reference signal (Q_new) that is recently indicated by the higher layer.
​[Claim 17]
​A beam failure recovery apparatus, applied to a network device, the apparatus comprising: a first indication unit, configured to send, to a terminal device, signaling for indicating joint beam failure recovery between two or more cells of the terminal device.
​[Claim 18]
​A beam failure recovery apparatus, applied to a network device, the apparatus comprising: a second indication unit, configured to send, to the terminal device, a cell for indicating monitoring and/or receiving a downlink signal, and/or a bandwidth part, and/or signaling of a control resource set (CORESET).
​[Claim 19]
​The apparatus of claim 18, wherein the second signaling comprises a cell, and/or a BWP, and/or a mapping relationship between a control resource set (CORESET) or a search space.
​[Claim 20]
​The apparatus according to claim 17, wherein the apparatus further comprises: a third indication unit, configured to send a BFR response related to beam failure recovery to the terminal device.