CN109391405B

CN109391405B - Method, device, terminal and network equipment for recovering beam failure

Info

Publication number: CN109391405B
Application number: CN201710682088.3A
Authority: CN
Inventors: 黄秋萍; 陈润华; 高秋彬
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2017-08-10
Filing date: 2017-08-10
Publication date: 2021-01-22
Anticipated expiration: 2037-08-10
Also published as: CN109391405A

Abstract

The invention provides a method, a device, a terminal and network equipment for recovering beam failure, wherein the method comprises the following steps: if the M effective wave beams are detected to have wave beam failure, sending a wave beam failure recovery request to the network; configuring a physical downlink control channel in a second control resource set and a downlink reference signal corresponding to at least one downlink transmitting beam to be switched as a spatial QCL; monitoring a physical downlink control channel by using a downlink receiving beam corresponding to a downlink reference signal in a second control resource set; in the embodiment of the invention, a network side configures a second control resource set corresponding to a physical downlink control channel for beam recovery for a terminal, so that the resource management of the physical downlink control channel under beam failure and recovery events is realized; and further, the terminal can more accurately obtain the downlink receiving beam corresponding to the physical downlink control channel through the setting of the spatial QCL, so that the physical downlink control channel can be more accurately monitored.

Description

Method, device, terminal and network equipment for recovering beam failure

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, a terminal, and a network device for recovering a beam failure.

Background

In view of the important role of MIMO (Multiple-Input Multiple-Output) technology in improving peak rate and system spectrum utilization, wireless access technology standards such as LTE (long Term evolution)/LTE-a (LTE-Advanced) are constructed based on MIMO + OFDM (Orthogonal Frequency Division Multiplexing) technology. The performance gain of the MIMO technology comes from the space freedom degree that can be obtained by the multi-antenna system, so that one of the most important evolution directions of the MIMO technology in the standardization development process is the extension of dimension.

In the air interface NR, a downlink control resource for transmitting downlink control information is referred to as a CORESET (control resource set). Each CORESET includes a plurality of PDCCH candidates (Physical Downlink Control channels), each PDCCH candidate including a specific time/frequency resource on which a DCI can be transmitted. The UE may configure one or more CORESETS on which the UE should monitor the PDCCH. Different CORESET may use the same or different beam transmissions. In one CORESET, different PDCCH candidates may also be transmitted using the same or different beams.

Considering a radio link, the base station BS has M Tx beams (transmit beams) and the terminal UE has N Rx beams (receive beams), for a total of M x N Tx-Rx beam pairs. Since the number of Tx/Rx beams in the mm wave band is typically large in order to achieve sufficient coverage boosting, an efficient beam measurement and reporting procedure is important to ensure low system operating overhead and UE complexity in the 5G NR.

For a UE that has generated beam quality measurements for M x N beam pairs, it is necessary to report the beam quality and/or beam index of a subset of beam pairs, and in subsequent downlink transmissions, the base station may select one of the reported beams received for transmission (e.g., the best one reported by the UE). The base station also needs to indicate to the UE the index of its selected transmit beam. After receiving an indication of the transmit beam selected by the base station for downlink transmission, the UE can look up from its memory the best receive beam corresponding to the indication. In summary, the downlink transmit beam indication of a transmit signal needs to be sent to the receiver for determining the receive beam.

The UE needs to know the downlink transmit beam of the DCI to determine the appropriate receive beam. This can be done by spatial QCL (Quasi co-location) signaling. The definition of spatial QCL is: the two signal spaces QCL are called if the transmit filter (transmit beam) of one signal can be assumed to be the same as the transmit filter of the other signal. Therefore, the UE may use the same receive spatial filter (receive beam) as the first signal to receive the second signal.

For downlink control channels, the CORESET/PDCCH may be indicated as having a spatial QCL with a particular DL RS (downlink reference signal). Here, the DL RS is a reference signal for beam measurement/reporting. When the UE receives the CORESET/PDCCH, the DL RS may be received using the same reception beam.

In order for the network to maintain a connection with the UE, a prerequisite is that any downlink control channel transmitted by the network must be able to be reliably decoded by the UE. It is assumed that the downlink control channel can be transmitted on a set of M active beams, each associated with one DL RS, which means that the signal quality of at least one of the M active beams must be sufficiently high. If the quality of a certain beam drops below a certain threshold, the DCI on that beam cannot be turbo decoded by the UE, and the beam may be considered "failed". If all M active beams fail, the network will not be able to send any downlink control information to the UE, which is defined as "beam failure". In order to obtain a connection, a new link re-establishment is required.

After a beam fails in the prior art, a terminal sends a beam failure recovery request to a base station, where the request may include a new candidate beam recommended to the base station; after receiving the request, the base station sends a response signaling to the terminal, where the response signaling includes switching to a new candidate beam or restarting beam search or other indications. The beam failure recovery mechanism can be quickly switched to a spare Beam Pair Link (BPL) to continuously transmit control messages and data, so that the beam quick recovery is realized. However, the beam failure recovery mechanism in the prior art describes how to control and manage the downlink control channel resources in the event of beam failure and recovery.

Disclosure of Invention

The invention aims to provide a method, a device, a terminal and a network device for recovering beam failure, so as to solve the problem that how to control and manage downlink control channel resources under the beam failure and recovery events is not described in the prior art.

In order to solve the above problem, an embodiment of the present invention provides a method for recovering a beam failure, including:

monitoring a physical downlink control channel in a first control resource set, and if detecting that M effective beams for transmitting the downlink control channel all have beam failure, sending a beam failure recovery request to a network; the beam failure recovery request includes: the terminal selects the indication information of at least one downlink transmission beam to be switched and the indication information indicating that the M effective beams all have beam failure; m is an integer greater than or equal to 1;

configuring a physical downlink control channel in a second control resource set and a downlink reference signal corresponding to the at least one downlink transmission beam to be switched as a spatial quasi co-location QCL;

and monitoring a physical downlink control channel by using a downlink receiving beam corresponding to the downlink reference signal in the second control resource set.

Preferably, the step of monitoring a physical downlink control channel using a downlink receive beam corresponding to the downlink reference signal in the second control resource set includes:

and after receiving a beam failure recovery response sent by a network, monitoring a physical downlink control channel by using a downlink receiving beam corresponding to the downlink reference signal in the second control resource set.

Preferably, the method further comprises:

receiving the configuration of the first control resource set and the configuration of the second control resource set sent by a network side; or,

receiving configuration of a preset control resource set sent by a network side, wherein the preset control resource set is used as the first control resource set and the second control resource set;

wherein, the first control resource set is a set of physical downlink control channel resources corresponding to M effective beams; the second set of control resources is a set of physical downlink control channel resources for beam recovery.

Preferably, the step of receiving the configuration of the first control resource set and the configuration of the second control resource set sent by the network side includes:

receiving the configuration of the first control resource set and the configuration of the second control resource set sent by a network side through semi-static signaling or dynamic signaling; or,

the step of receiving the configuration of a preset control resource set sent by the network side includes:

and receiving the preset control resource set sent by the network side through semi-static signaling or dynamic signaling.

Preferably, before configuring the physical downlink control channel in the second control resource set and the downlink reference signal corresponding to the at least one downlink transmission beam to be switched as the spatial quasi co-located QCL, the method further includes:

acquiring a corresponding relation between a pre-configured downlink transmitting wave beam to be switched and a downlink reference signal;

and determining a downlink reference signal corresponding to the at least one downlink transmitting beam to be switched according to the corresponding relation.

Preferably, the step of configuring the physical downlink control channel in the second control resource set and the downlink reference signal corresponding to the at least one downlink transmission beam to be switched as a spatial quasi co-located QCL includes:

and configuring the downlink receiving beam for receiving the downlink reference signal corresponding to the at least one downlink transmitting beam to be switched as the downlink receiving beam for receiving the physical downlink control channel in the second control resource set.

Preferably, the method further comprises:

and stopping monitoring the first physical downlink control channel in the first control resource set at a preset time.

Preferably, the preset time is as follows:

after the terminal determines that all the M effective wave beams have wave beam failure; or,

after the terminal sends the beam failure recovery request to the network; or,

and the terminal sends the beam failure recovery request to the network and receives a beam failure recovery response sent by the network.

Preferably, the first physical downlink control channel includes: a common physical downlink control channel and/or a dedicated physical downlink control channel;

or, the first physical downlink control channel includes: and the physical downlink control channel carries the uplink grant information and/or the physical downlink control channel carries the downlink grant information.

Preferably, the method further comprises:

and continuously monitoring a second physical downlink control channel in the first control resource set.

Preferably, the second physical downlink control channel includes: a common physical downlink control channel and/or a dedicated physical downlink control channel.

Or, the second physical downlink control channel includes: and the physical downlink control channel carries the uplink grant information and/or the physical downlink control channel carries the downlink grant information.

The embodiment of the invention also provides a method for recovering the beam failure, which comprises the following steps:

receiving a beam failure recovery request sent by a terminal; the beam failure recovery request includes: the indication information of at least one downlink transmitting wave beam to be switched selected by the terminal and the indication information indicating that the wave beams of M effective wave beams used for transmitting the downlink control channel all fail; m is an integer greater than or equal to 1;

selecting at least one downlink transmitting beam from the downlink transmitting beams to be switched as a target downlink transmitting beam according to the beam failure recovery request;

and transmitting the physical downlink control channel on a second control resource set by using the selected target downlink transmitting beam.

Preferably, before the physical downlink control channel is transmitted on the second set of control resources using the selected target downlink transmission beam, the method further includes:

and sending a beam failure recovery response to the terminal.

Preferably, the method further comprises:

sending the configuration of the first control resource set and the configuration of the second control resource set to the terminal; or,

sending the configuration of a preset control resource set to a terminal; wherein the preset control resource set is used as a first control resource set and a second control resource set;

Preferably, the step of sending the configuration of the first control resource set and the configuration of the second control resource set to the terminal includes:

sending the configuration of a first control resource set and the configuration of a second control resource set to a terminal through semi-static signaling or dynamic signaling; or,

the step of sending the configuration of a preset control resource set to the terminal includes:

and sending the preset control resource set to a terminal through semi-static signaling or dynamic signaling.

An embodiment of the present invention further provides a device for recovering a beam failure, including:

a request sending module, configured to monitor a physical downlink control channel in a first control resource set, and send a beam failure recovery request to a network if it is detected that all M effective beams used for transmitting the downlink control channel have beam failure; the beam failure recovery request includes: the terminal selects the indication information of at least one downlink transmission beam to be switched and the indication information indicating that the M effective beams all have beam failure; m is an integer greater than or equal to 1;

a configuration module, configured to configure a physical downlink control channel in a second control resource set and a downlink reference signal corresponding to the at least one downlink transmission beam to be switched as a spatial quasi co-located QCL;

a first monitoring module, configured to monitor a physical downlink control channel in the second control resource set by using a downlink receive beam corresponding to the downlink reference signal.

Preferably, the first monitoring module comprises:

and the monitoring submodule is used for monitoring a physical downlink control channel by using a downlink receiving beam corresponding to the downlink reference signal in the second control resource set after receiving a beam failure recovery response sent by a network.

Preferably, the apparatus further comprises:

a first control resource set configuration receiving module, configured to receive configuration of the first control resource set and configuration of the second control resource set sent by a network side; and/or the presence of a gas in the gas,

a second control resource set configuration receiving module, configured to receive configuration of a preset control resource set sent by a network side, where the preset control resource set is used as the first control resource set and the second control resource set;

Preferably, the first control resource set configuration receiving module includes:

a first sub-module, configured to receive a configuration of the first control resource set and a configuration of the second control resource set that are sent by a network side through a semi-static signaling or a dynamic signaling; and/or the presence of a gas in the gas,

the second controlling resource set configuration receiving module comprises:

and the second sub-module is used for receiving the preset control resource set sent by the network side through the semi-static signaling or the dynamic signaling.

Preferably, the apparatus further comprises:

the relation acquisition module is used for acquiring the corresponding relation between the downlink transmitting wave beam to be switched and the downlink reference signal which is configured in advance;

and the reference signal determining module is used for determining a downlink reference signal corresponding to the at least one downlink transmitting beam to be switched according to the corresponding relation.

Preferably, the configuration module includes:

a configuration submodule, configured to configure a downlink receive beam for receiving a downlink reference signal corresponding to the at least one downlink transmit beam to be switched to receive a downlink receive beam of a physical downlink control channel in the second control resource set.

Preferably, the apparatus further comprises:

and the stopping module is used for stopping monitoring the first physical downlink control channel in the first control resource set at a preset time.

Preferably, the preset time is as follows:

after the terminal sends the beam failure recovery request to the network; or,

Preferably, the first physical downlink control channel includes: a common physical downlink control channel and/or a dedicated physical downlink control channel.

Preferably, the apparatus further comprises:

and the second monitoring module is used for continuously monitoring a second physical downlink control channel in the first control resource set.

The embodiment of the invention also provides a terminal, which comprises a memory, a processor and a computer program which is stored on the memory and can be run on the processor, wherein the processor executes the program to realize the following steps:

An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the following steps:

a request receiving module, configured to receive a beam failure recovery request sent by a terminal; the beam failure recovery request includes: the indication information of at least one downlink transmitting wave beam to be switched selected by the terminal and the indication information indicating that the wave beams of M effective wave beams used for transmitting the downlink control channel all fail; m is an integer greater than or equal to 1;

a beam selection module, configured to select at least one downlink transmission beam from the to-be-switched downlink transmission beams as a target downlink transmission beam according to the beam failure recovery request;

a transmission module, configured to transmit a physical downlink control channel on a second control resource set using the selected target downlink transmit beam.

Preferably, the apparatus further comprises:

and the response sending module is used for sending the beam failure recovery response to the terminal.

Preferably, the apparatus further comprises:

a first configuration module, configured to send, to the terminal, a configuration of the first control resource set and a configuration of the second control resource set; and/or the presence of a gas in the gas,

the second configuration module is used for sending the configuration of a preset control resource set to the terminal; wherein the preset control resource set is used as a first control resource set and a second control resource set;

Preferably, the first configuration module includes:

the first configuration submodule is used for sending the configuration of a first control resource set and the configuration of a second control resource set to the terminal through semi-static signaling or dynamic signaling; and/or the presence of a gas in the gas,

the second configuration module comprises:

and the second configuration submodule is used for sending the preset control resource set to the terminal through semi-static signaling or dynamic signaling.

The embodiment of the present invention further provides a network device, which includes a memory, a processor, and a computer program stored in the memory and capable of running on the processor, and when the processor executes the computer program, the processor implements the following steps:

The technical scheme of the invention at least has the following beneficial effects:

according to the technical scheme of the embodiment of the invention, the network side configures a second control resource set corresponding to the physical downlink control channel for beam recovery for the terminal, so that the resource management of the physical downlink control channel under the beam failure and recovery events is realized; further, when the beam is recovered, it is assumed that a physical downlink control channel in a second control resource set and a downlink reference signal corresponding to the at least one downlink transmission beam to be switched are spatial quasi co-located QCLs, so that a downlink reception beam corresponding to the downlink reference signal is used in the second control resource set to monitor the physical downlink control channel, so that the terminal can more accurately obtain the downlink reception beam corresponding to the physical downlink control channel, and thus the physical downlink control channel is more accurately monitored.

Drawings

Fig. 1 is a flowchart illustrating steps of a method for recovering a beam failure according to an embodiment of the present invention;

fig. 2 is a schematic diagram illustrating a relative relationship between a first control resource set and a second control resource set in a method for recovering a beam failure according to an embodiment of the present invention;

fig. 3 is a second schematic diagram illustrating a relative relationship between a first control resource set and a second control resource set in the method for recovering a beam failure according to the embodiment of the present invention;

fig. 4 is a third schematic diagram illustrating a relative relationship between a first control resource set and a second control resource set in the method for recovering a beam failure according to the embodiment of the present invention;

fig. 5 is a flowchart illustrating a second step of the method for recovering from beam failure according to the embodiment of the present invention;

fig. 6 is a schematic structural diagram of a beam failure recovery apparatus according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a terminal according to an embodiment of the present invention;

fig. 8 is a second schematic structural diagram of a beam failure recovery apparatus according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a network device according to an embodiment of the present invention.

Detailed Description

The technical solutions of the embodiments of the present invention are described in detail with reference to the drawings and the specific embodiments, and it should be understood that the specific features of the embodiments and the embodiments of the present invention are detailed descriptions of the technical solutions of the embodiments of the present invention, and are not limited to the technical solutions of the embodiments of the present invention, and the technical features of the embodiments and the embodiments of the present invention may be combined with each other without conflict.

The embodiment of the invention can be applied to a 5G system; the present invention is also applicable to other wireless Communication systems, such as Long Term Evolution (LTE) System, Global System for Mobile Communication (GSM) System, Mobile Communication System (UMTS), Code Division Multiple Access (CDMA) System, and new network equipment System.

A terminal according to embodiments of the present invention may refer to a device that provides voice and/or data connectivity to a user, a handheld device having wireless connectivity, or other processing device connected to a wireless modem. Wireless user equipment may communicate with one or more core networks via a Radio Access Network (RAN), and terminals may be mobile terminals such as mobile telephones (or "cellular" telephones) and computers having mobile terminals, such as portable, pocket, hand-held, computer-included, or vehicle-mounted mobile devices, that exchange language and/or data with the RAN. Examples of such devices include Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), and the like. A Terminal may also be referred to as a system, a Subscriber Unit (Subscriber Unit), a Subscriber Station (Subscriber Station), a Mobile Station (Mobile), a Remote Station (Remote Station), an Access Point (Access Point), a Remote Terminal (Remote Terminal), an Access Terminal (Access Terminal), a User Terminal (User Terminal), a User Agent (User Agent), a User Device (User Device), and a wireless Device (wireless Device).

The network device according to embodiments of the present invention may be a router for converting received air frames and IP packets to each other as between a wireless terminal device and the rest of the access network, where the rest of the access network may include an Internet Protocol (IP) network device. The network device may also be a device that coordinates management of attributes for the air interface. For example, the network device may be a network device in a 5G System, such as a Next generation Base Station (Next generation Node B, gNB), a Base Transceiver Station (BTS) in a Global System for Mobile Communication (GSM) or Code Division Multiple Access (CDMA), a Base Station (NodeB) in a Wideband Code Division Multiple Access (WCDMA), or an evolved Node B (eNB or e-NodeB) in LTE, which is not limited in the embodiments of the present invention.

It is to be understood that the terms first, second, and the like in the description of the embodiments of the invention are used for distinguishing between the descriptions and not necessarily for describing a sequential or chronological order. "plurality" in the description of the embodiments of the present invention means two or more.

As shown in fig. 1, an embodiment of the present invention provides a method for recovering a beam failure, including:

step 11, monitoring a physical downlink control channel in a first control resource set, and if detecting that all M effective beams for transmitting the downlink control channel have beam failure, sending a beam failure recovery request to a network; the beam failure recovery request includes: the terminal selects the indication information of at least one downlink transmission beam to be switched and the indication information indicating that the M effective beams all have beam failure; m is an integer greater than or equal to 1.

In this step, M effective beams exist for the transmission of the PDCCH from the network device (e.g., base station) to the terminal. The set of active beams may be semi-statically configured through radio resource control, RRC, signaling. One PDCCH may be transmitted using any one or more of the M active beams.

Specifically, the indication information of the downlink transmission beam to be switched may specifically be: the identifier or indication of the downlink transmission beam to be switched, the identifier or indication of the resource using the channel state information reference signal CSI-RS of the downlink transmission beam to be switched, the identifier or indication of the port using the channel state information reference signal CSI-RS of the downlink transmission beam to be switched, and the like, which are not specifically limited herein.

Preferably, the quality of the received signal corresponding to the downlink transmission beam to be switched needs to be higher than a certain threshold. The signal quality here may be reference signal received power RSRP of the downlink reference signal, signal-to-noise ratio SNR of the downlink reference signal, reference signal received quality RSRQ of the downlink reference signal, channel quality indicator CQI of the downlink reference signal, or capacity corresponding to the downlink reference signal, and is not limited specifically here.

Preferably, the terminal receives the signal by using a downlink receiving beam corresponding to the downlink transmitting beam to be switched, and measures the quality of the received signal. The signal quality here may be reference signal received power RSRP of the downlink reference signal, signal-to-noise ratio SNR of the downlink reference signal, reference signal received quality RSRQ of the downlink reference signal, channel quality indicator CQI of the downlink reference signal, or capacity corresponding to the downlink reference signal, and is not limited specifically here. The receiving beam corresponding to the downlink transmitting beam to be switched may be obtained and stored by the terminal in advance.

And step 12, configuring a physical downlink control channel in the second control resource set and a downlink reference signal corresponding to the at least one downlink transmission beam to be switched as a spatial quasi co-location QCL.

In this step, the spatial quasi-co-location QCL is specifically defined as: and receiving the downlink receiving beam of the physical downlink control channel in the second control resource set and receiving the downlink reference signal corresponding to the at least one downlink transmitting beam to be switched are the same.

Therefore, the step 12 specifically includes:

step 121, configuring the downlink receiving beam for receiving the downlink reference signal corresponding to the at least one to-be-switched downlink transmitting beam as a downlink receiving beam for receiving the physical downlink control channel in the second control resource set, and then the physical downlink control channel in the second control resource set and the downlink reference signal corresponding to the to-be-switched downlink transmitting beam are spatial quasi co-located QCLs.

In this step, in order to enable the terminal to more accurately obtain and receive the downlink receiving beam for the physical downlink control channel, in the embodiment of the present invention, it is assumed that the physical downlink control channel in the second control resource set and the downlink reference signal corresponding to the at least one downlink transmitting beam to be switched are spatial quasi co-located QCLs.

And step 13, monitoring a physical downlink control channel by using a downlink receiving beam corresponding to the downlink reference signal in the second control resource set.

In this step, the downlink receive beam of the physical downlink control channel in the second control resource set can be determined according to the downlink receive beam of the downlink reference signal, so that the physical downlink control channel is monitored on the determined downlink receive beam.

Further, step 13 in the above embodiment of the present invention includes:

Specifically, after receiving a beam failure recovery response sent by a network, the terminal determines that a beam is recovered and determines that the network switches to at least one to-be-switched downlink transmission beam selected by the terminal to transmit a physical downlink control channel; and the terminal can monitor the physical downlink control channel by using the downlink receiving beam corresponding to the downlink reference signal in the second control resource set.

It should be noted that, in the above embodiment of the present invention, the method further includes: receiving the configuration of the first control resource set and the configuration of the second control resource set sent by a network side; or,

receiving configuration of a preset control resource set sent by a network side, wherein the preset control resource set is used as the first control resource set and the second control resource set; wherein, the first control resource set is a set of physical downlink control channel resources corresponding to M effective beams; the second set of control resources is a set of physical downlink control channel resources for beam recovery.

Each active beam and one downlink reference signal or a plurality of downlink reference signals are spatial quasi co-located QCLs. A set of time/frequency resources for a terminal to monitor a physical downlink control channel PDCCH before a beam failure occurs in all M active beams is defined as a first set of control resources. A different PDCCH in the first set of control resources may correspond to one of the M active beams. When the terminal decodes one PDCCH, the terminal uses the same receive beam (which may be analog, digital, or analog-digital mixed) as the downlink reference signal corresponding to the active beam corresponding to the PDCCH.

Preferably, the method further comprises:

the configuration of the first control resource set and the configuration of the second control resource set sent to the terminal may be sent simultaneously or independently.

It should be noted that the network can independently send the configuration of the first set of control resources and the configuration of the second set of control resources. For example, the configuration of the first set of control resources and the configuration of the second set of control resources may be transmitted in the same DCI or in different DCIs. For another example, the configuration of the first set of control resources is sent using semi-static signaling and the configuration of the second set of control resources is sent using DCI. For another example, the configuration of the first control resource set uses semi-static signaling (e.g., RRC signaling or MAC CE signaling) transmission at time 1, the configuration of the second control resource set uses semi-static signaling transmission at time 2, and so on.

It should be noted that, in the above embodiment of the present invention, the first control resource set and the second control resource set are substantially the set of time-frequency resources of the physical downlink control channel monitored by the terminal. The first and second sets of control resources have the same characteristics as follows (for convenience of description, the first and second sets of control resources are collectively referred to herein as control resource sets):

1. one control resource set and one downlink reference signal are spatial quasi co-located QCLs; that is, all PDCCHs transmitted within the control resource set and the downlink reference signal are spatial quasi co-located QCLs. The terminal monitors the PDCCH using the same downlink reception beam as the downlink reference signal.

It should be noted that the terminal monitors the PDCCH as a blind detection method, and the terminal only knows that the PDCCH may exist in the control resource set, but does not know a specific location. Therefore, the terminal monitors the PDCCH at some possible positions by using the downlink receiving beam which is the same as the downlink reference signal, and if the PDCCH is monitored, the PDCCH is decoded; and if the monitoring is not successful, the PDCCH does not exist in the control resource set or the monitoring of the downlink transmitting beam corresponding to the downlink receiving beam is failed.

2. One control resource set and a plurality of downlink reference signals are spatial quasi co-located QCLs; one mode is that the terminal simultaneously uses a plurality of downlink receiving beams corresponding to the downlink reference signals to carry out PDCCH monitoring; the other mode is that the terminal adopts different downlink receiving beams corresponding to the downlink reference signals at different time to perform PDCCH monitoring. One time may correspond to only one downlink reference signal corresponding to a receiving beam, or one time may correspond to a group of downlink receiving beams corresponding to a group of downlink reference signals.

Here, the downlink reception beam may correspond to an analog beam, a digital beam, or a digital-analog hybrid beam. For example, when a terminal has only one antenna panel, one time corresponds to only one analog receive beam. If the digital beam is a digital beam, the digital beam can correspond to a plurality of receiving beams; when the terminal has multiple antenna panels, multiple analog receive beams may be used simultaneously for reception.

It should be further noted that the control resource set generally refers to a physical resource block (block) for physical downlink control channel transmission. It may contain one or more blocks of such resources, each block may be referred to as a "control resource set", and a terminal may also be configured with multiple "control resource sets". For example, the system configures the UE with multiple sets of control resources, where each set of control resources corresponds to one of the M active beams. When the UE decodes the PDCCH in each control resource set, the terminal uses the same reception beam as the downlink reference signal corresponding to the beam. Regardless of the manner in which the configuration of the system defines a "control resource set," or the terminology defines resources having the same functionality as the control resource set herein, these differences are merely differences in definition and do not limit the applicability of the present invention.

Further, in the above embodiment of the present invention, the method further includes:

receiving the configuration of the first control resource set and the configuration of the second control resource set sent by a network side through semi-static signaling or dynamic signaling; i.e. the time/frequency resources of the first set of control resources and the second set of control resources are configured separately by the network, e.g. by semi-static signaling. As shown in fig. 2, the second set of control resources and the first set of control resources may be completely non-overlapping; or as shown in fig. 3, the second set of control resources and the first set of control resources may partially overlap; alternatively, as shown in FIG. 4, the second controlling resource set falls within the first controlling resource set. Of course, the first set of control resources may also fall within the second set of control resources.

The first set of control resources is configured as a set of time/frequency resources for which the terminal monitors the old PDCCH (PDCCH transmitted using one or more of the M active beams); the second set of control resources is configured as a set of time/frequency resources for which the terminal monitors a new PDCCH (PDCCH for beam-recovery transmission). The new PDCCH is transmitted using a new alternate beam selected from the K candidate beams. When the terminal tries to decode the PDCCH in the second control resource set, it should be assumed that the downlink reference signal corresponding to the new PDCCH and the downlink transmission beam to be switched is a spatial quasi co-located QCL. The downlink transmission beam to be switched may be reported by the terminal recently or may be reported by the terminal before a preset time interval. The preset time interval may be predetermined by the network and the terminal, or notified to the terminal by the base station, or determined by the terminal itself.

Or, receiving the preset control resource set sent by the network side through semi-static signaling or dynamic signaling, where the preset control resource set is used as the first control resource set and the second control resource set. That is, the network configures a preset control resource set for both the old PDCCH (PDCCH for M active beam transmissions) and the new PDCCH (PDCCH for beam-recovery transmissions) monitoring.

The terminal monitors the quality of the M PDCCH beams while monitoring a preset control resource set (corresponding to the first control resource set) to obtain the old PDCCH. If monitoring of all the M candidate PDCCH beams fails, and the UE detects at least one new downlink transmission beam and reports the new downlink transmission beam to the network, the terminal starts monitoring the new PDCCH in a preset control resource set (corresponding to a second control resource set), and assumes that a downlink reference signal associated with the new PDCCH and the new alternative beam is spatial QCL.

Further, in the foregoing embodiment of the present invention, before step 22, the method further includes:

determining a downlink reference signal corresponding to the at least one downlink transmitting beam to be switched according to the corresponding relation; the downlink transmission beam to be switched can select a beam with higher quality from the K candidate beams. The network side may preset one or more downlink reference signals corresponding to the K candidate beams.

It should be further noted that, when the terminal detects that all of the M effective beams are failed and finds a new alternative downlink transmission beam, the terminal may continue to monitor the old PDCCH in the first control resource set, or the terminal may stop monitoring the old PDCCH in the first control resource set.

Specifically, the method in the above embodiment of the present invention further includes:

When all M candidate beams are detected to fail, the terminal stops monitoring the PDCCH in the first control resource set. This is especially important for uplink grant monitoring, since if a terminal erroneously detects an uplink grant (on an old beam), the terminal may erroneously transmit a physical uplink shared channel, PUSCH, which has not been scheduled yet, so that the base station BS and other cells generate unnecessary interference. Therefore, the terminal should stop monitoring the PDCCH in the first control resource set.

Specifically, the preset time is as follows:

after the terminal determines that the M effective wave beams all have wave beam failure (no matter whether the terminal reports the downlink transmitting wave beams to be switched to the base station or not); if the avoidance of erroneous PDCCH monitoring on the old beam is of high priority, then preferably the terminal stops monitoring PDCCH in the first set of control resources after determining that all M active beams have failed in beam.

Or the terminal sends the beam failure recovery request to the network.

Or, the terminal sends the beam failure recovery request to the network and receives a beam failure recovery response sent by the network; if the control signal connection with the base station is kept as high priority before the beam to be switched is determined, the monitoring of the PDCCH in the first control resource set is preferably stopped after the terminal sends the beam failure recovery request to the network and receives a beam failure recovery response sent by the network.

Preferably, the first physical downlink control channel includes: a common physical downlink control channel and/or a dedicated physical downlink control channel. For example, different processing manners are adopted for the common PDCCH and the dedicated PDCCH, and the terminal stops monitoring the dedicated PDCCH in the first control resource set and continues monitoring the common PDCCH in the first control resource set.

Preferably, the first physical downlink control channel includes:

and the physical downlink control channel carries the uplink grant information and/or the physical downlink control channel carries the downlink grant information. For example, the terminal continues to monitor the PDCCH carrying downlink grant DL information on the first set of control resources while stopping monitoring the PDCCH carrying uplink grant UL information on the first set of control resources.

Alternatively, the method further comprises:

Preferably, the second physical downlink control channel includes: a common physical downlink control channel and/or a dedicated physical downlink control channel. For example, different processing manners are adopted for the common PDCCH and the dedicated PDCCH, and the terminal continues to monitor the dedicated PDCCH in the first control resource set and simultaneously stops monitoring the common PDCCH in the first control resource set.

Preferably, the second physical downlink control channel includes: and the physical downlink control channel carries the uplink grant information and/or the physical downlink control channel carries the downlink grant information. For example, the terminal stops monitoring the PDCCH carrying the downlink grant DL information on the first control resource set while continuing to monitor the PDCCH carrying the uplink grant UL information on the first control resource set.

In summary, in the above embodiments of the present invention, the network side configures, for the terminal, the physical downlink control channel for beam recovery to correspond to the second control resource set, so as to implement resource management of the physical downlink control channel in the event of beam failure and recovery; further, when the beam is recovered, it is assumed that a physical downlink control channel in a second control resource set and a downlink reference signal corresponding to the at least one downlink transmission beam to be switched are spatial quasi co-located QCLs, so that a downlink reception beam corresponding to the downlink reference signal is used in the second control resource set to monitor the physical downlink control channel, so that the terminal can more accurately obtain the downlink reception beam corresponding to the physical downlink control channel, and thus the physical downlink control channel is more accurately monitored.

As shown in fig. 5, an embodiment of the present invention further provides a method for recovering a beam failure, including:

step 51, receiving a beam failure recovery request sent by a terminal; the beam failure recovery request includes: the indication information of at least one downlink transmitting wave beam to be switched selected by the terminal and the indication information indicating that the wave beams of M effective wave beams used for transmitting the downlink control channel all fail; m is an integer greater than or equal to 1.

Specifically, the indication information of the downlink transmission beam to be switched may specifically be: the identity of the downlink transmission beam to be switched, the resource of the channel state information reference signal CSI-RS of the downlink transmission beam to be switched, the port indication of the channel state information reference signal CSI-RS of the downlink transmission beam to be switched, and the like, which are not specifically limited herein.

Preferably, the signal quality of the downlink transmission beam to be switched needs to be higher than a certain threshold. The signal quality here may be reference signal received power RSRP of the downlink reference signal, signal-to-noise ratio SNR of the downlink reference signal, reference signal received quality RSRQ of the downlink reference signal, channel quality indicator CQI of the downlink reference signal, or capacity corresponding to the downlink reference signal, and is not limited specifically here.

Step 52, according to the beam failure recovery request, selecting at least one downlink transmission beam from the downlink transmission beams to be switched as a target downlink transmission beam;

and 53, using the selected target downlink transmission beam to transmit the physical downlink control channel in the second control resource set.

Further, before step 53 in the above embodiment of the present invention, the method further includes:

and sending a beam failure recovery response to the terminal.

Specifically, the method further comprises:

and sending a beam failure recovery response to the terminal through semi-static signaling or dynamic signaling. For example, by RRC signaling, or by DCI signaling.

sending the configuration of a preset control resource set to a terminal; wherein the preset control resource set is used as a first control resource set and a second control resource set; wherein, the first control resource set is a set of physical downlink control channel resources corresponding to M effective beams; the second set of control resources is a set of physical downlink control channel resources for beam recovery.

1. one control resource set and one downlink reference signal are spatial quasi co-located QCLs; that is, all PDCHHs transmitted within the control resource set and the downlink reference signal are spatial quasi co-located QCLs. The terminal monitors the PDCCH using the same downlink reception beam as the downlink reference signal.

Here, the downlink reception beam may correspond to an analog beam or a reception beam. When the terminal only has one antenna panel, one time can only correspond to one analog receiving beam, and if the terminal is a digital beam, the terminal can correspond to a plurality of receiving beams; when the terminal has multiple antenna panels, multiple analog receive beams may be used simultaneously for reception.

Further, the method in the above embodiment of the present invention further includes:

sending the configuration of a first control resource set and the configuration of a second control resource set to a terminal through semi-static signaling or dynamic signaling; i.e. the time/frequency resources of the first set of control resources and the second set of control resources are configured separately by the network, e.g. by semi-static signaling. As shown in fig. 2, the second set of control resources and the first set of control resources may be completely non-overlapping; or as shown in fig. 3, the second set of control resources and the first set of control resources may partially overlap; alternatively, as shown in FIG. 4, the second controlling resource set falls within the first controlling resource set. Of course, the first set of control resources may also fall within the second set of control resources.

The first set of control resources is configured as a set of time/frequency resources for which the terminal monitors the old PDCCH (PDCCH of M active beam transmissions); the second set of control resources is configured as a set of time/frequency resources for which the terminal monitors a new PDCCH (PDCCH for beam-recovery transmission). The new PDCCH is transmitted using a new alternate beam selected from the K candidate beams. When the terminal tries to decode the PDCCH in the second control resource set, it should be assumed that the downlink reference signal corresponding to the new PDCCH and the downlink transmission beam to be switched is a spatial quasi co-located QCL. The downlink transmission beam to be switched may be reported by the terminal recently or may be reported by the terminal before a preset time interval. The preset time interval may be predetermined by the network and the terminal, or notified to the terminal by the base station, or determined by the terminal itself.

Or, the preset control resource set is sent to the terminal through a semi-static signaling or a dynamic signaling; wherein the preset set of control resources is used as the first set of control resources and the second set of control resources. That is, the network configures a preset control resource set for both the old PDCCH (PDCCH for M active beam transmissions) and the new PDCCH (PDCCH for beam-recovery transmissions) monitoring.

In summary, in the above embodiments of the present invention, the network side configures, for the terminal in advance, the second control resource set for monitoring the physical downlink control channel after the beam failure occurs and the beam recovery is implemented, so as to implement resource management of the physical downlink control channel in the event of the beam failure and the recovery.

As shown in fig. 6, an embodiment of the present invention further provides a device for recovering a beam failure, including:

a request sending module 61, configured to monitor a physical downlink control channel in a first control resource set, and send a beam failure recovery request to a network if it is detected that all M effective beams used for transmitting the downlink control channel have beam failure; the beam failure recovery request includes: the terminal selects the indication information of at least one downlink transmission beam to be switched and the indication information indicating that the M effective beams all have beam failure; m is an integer greater than or equal to 1;

a configuration module 62, configured to configure a physical downlink control channel in a second control resource set and a downlink reference signal corresponding to the at least one downlink transmission beam to be switched as a spatial quasi co-located QCL;

a first monitoring module 63, configured to monitor a physical downlink control channel in the second control resource set by using a downlink receive beam corresponding to the downlink reference signal.

Specifically, the apparatus in the above embodiment of the present invention further includes:

the response receiving module is used for receiving a beam failure recovery response sent by a network;

the first monitoring module includes:

Specifically, in the foregoing embodiment of the present invention, the first control resource set configuration receiving module includes:

the second controlling resource set configuration receiving module comprises:

Specifically, the configuration module in the above embodiment of the present invention includes:

Specifically, in the above embodiment of the present invention, the preset time is:

after the terminal sends the beam failure recovery request to the network; or,

Specifically, in the foregoing embodiment of the present invention, the first physical downlink control channel includes:

a common physical downlink control channel and/or a dedicated physical downlink control channel.

and the physical downlink control channel carries the uplink grant information and/or the physical downlink control channel carries the downlink grant information.

Specifically, in the foregoing embodiment of the present invention, the second physical downlink control channel includes:

In summary, in the embodiment of the present invention, the network side configures, for the terminal, the second control resource set corresponding to the physical downlink control channel for beam recovery, so as to implement resource management of the physical downlink control channel in the event of beam failure and recovery; further, when the beam is recovered, it is assumed that a physical downlink control channel in a second control resource set and a downlink reference signal corresponding to the at least one downlink transmission beam to be switched are spatial quasi co-located QCLs, so that a downlink reception beam corresponding to the downlink reference signal is used in the second control resource set to monitor the physical downlink control channel, so that the terminal can more accurately obtain the downlink reception beam corresponding to the physical downlink control channel, and thus the physical downlink control channel is more accurately monitored.

It should be noted that, the terminal provided in the embodiments of the present invention is a terminal capable of executing the method for recovering from a beam failure, and all embodiments of the method for recovering from a beam failure are applicable to the terminal and can achieve the same or similar beneficial effects.

As shown in fig. 7, an embodiment of the present invention further provides a terminal, which includes a memory 710, a processor 700, a transceiver 720, a user interface 730, and a computer program stored on the memory 710 and operable on the processor 700, where the processor 700 executes the computer program to implement the following steps:

The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.

As shown in fig. 8, an embodiment of the present invention further provides a device for recovering a beam failure, including:

a request receiving module 81, configured to receive a beam failure recovery request sent by a terminal; the beam failure recovery request includes: the indication information of at least one downlink transmitting wave beam to be switched selected by the terminal and the indication information indicating that the wave beams of M effective wave beams used for transmitting the downlink control channel all fail; m is an integer greater than or equal to 1;

a beam selection module 82, configured to select at least one downlink transmission beam from the to-be-switched downlink transmission beams as a target downlink transmission beam according to the beam failure recovery request;

a transmission module 83, configured to transmit a physical downlink control channel on a second control resource set using the selected target downlink transmit beam.

Preferably, the apparatus in the above embodiment of the present invention further includes:

Preferably, in the above embodiment of the present invention, the first configuration module includes:

the second configuration module comprises:

In summary, in the above embodiments of the present invention, the network side configures, for the terminal, the second control resource set corresponding to the physical downlink control channel for beam recovery, so as to implement resource management of the physical downlink control channel in the event of beam failure and recovery.

As shown in fig. 9, an embodiment of the present invention further provides a network device, which includes a memory 910, a processor 900, a transceiver 920, and a computer program stored on the memory 910 and executable on the processor 900, where the processor 900 implements the following steps when executing the computer program:

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-readable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block or blocks.

These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A method for recovering from a beam failure, comprising:

determining a physical downlink control channel in a second control resource set and a downlink reference signal corresponding to the at least one downlink transmission beam to be switched as a spatial quasi co-location QCL;

2. The method of claim 1, wherein the step of monitoring a physical downlink control channel within the second set of control resources using a downlink receive beam corresponding to the downlink reference signal comprises:

3. The method according to claim 1 or 2, characterized in that the method further comprises:

4. The method of claim 3, wherein the step of receiving the configuration of the first set of control resources and the configuration of the second set of control resources sent by the network side comprises:

5. The method according to claim 1 or 2, wherein before configuring the physical downlink control channel in the second control resource set and the downlink reference signal corresponding to the at least one downlink transmission beam to be switched as the spatial quasi co-located QCL, the method further comprises:

6. The method according to claim 1 or 2, wherein the step of configuring the physical downlink control channel in the second control resource set and the downlink reference signal corresponding to the at least one downlink transmission beam to be switched as a spatial quasi co-located QCL comprises:

7. The method according to claim 1 or 2, characterized in that the method further comprises:

8. The method according to claim 7, wherein the preset time is:

after the terminal sends the beam failure recovery request to the network; or,

9. The method of claim 7, wherein the first physical downlink control channel comprises: a common physical downlink control channel and/or a dedicated physical downlink control channel;

10. The method according to claim 1 or 2, characterized in that the method further comprises:

11. The method of claim 10, wherein the second physical downlink control channel comprises: a common physical downlink control channel and/or a dedicated physical downlink control channel;

12. A method for recovering from a beam failure, comprising:

transmitting a physical downlink control channel on a second set of control resources using the selected target downlink transmit beam; wherein, the physical downlink control channel in the second control resource set and the downlink reference signal corresponding to the at least one downlink transmission beam to be switched are spatial quasi co-located QCLs.

13. The method of claim 12, wherein the transmitting a physical downlink control channel on a second set of control resources using the selected target downlink transmit beam further comprises:

and sending a beam failure recovery response to the terminal.

14. The method according to claim 12 or 13, characterized in that the method further comprises:

15. The method of claim 14, wherein the step of sending the configuration of the first set of control resources and the configuration of the second set of control resources to the terminal comprises:

16. An apparatus for recovering from a beam failure, comprising:

a configuration module, configured to determine that a physical downlink control channel in a second control resource set and a downlink reference signal corresponding to the at least one downlink transmission beam to be switched are spatial quasi co-located QCLs;

17. The apparatus of claim 16, wherein the first monitoring module comprises:

18. The apparatus of claim 16 or 17, further comprising:

19. The apparatus of claim 18, wherein the first control resource set configuration receiving module comprises:

the second controlling resource set configuration receiving module comprises:

20. The apparatus of claim 16 or 17, further comprising:

21. The apparatus of claim 16 or 17, wherein the configuration module comprises:

22. The apparatus of claim 16 or 17, further comprising:

23. The apparatus according to claim 22, wherein the preset time is:

after the terminal sends the beam failure recovery request to the network; or,

24. The apparatus of claim 22, wherein the first physical downlink control channel comprises: a common physical downlink control channel and/or a dedicated physical downlink control channel;

25. The apparatus of claim 16 or 17, further comprising:

26. The apparatus of claim 25, wherein the second physical downlink control channel comprises: a common physical downlink control channel and/or a dedicated physical downlink control channel;

27. A terminal comprising a memory, a processor and a computer program stored on the memory and executable on the processor; wherein the processor implements the following steps when executing the program:

28. A computer-readable storage medium, on which a computer program is stored, which program, when executed by a processor, carries out the steps of:

29. An apparatus for recovering from a beam failure, comprising:

a transmission module, configured to transmit a physical downlink control channel on a second control resource set using the selected target downlink transmit beam; wherein, the physical downlink control channel in the second control resource set and the downlink reference signal corresponding to the at least one downlink transmission beam to be switched are spatial quasi co-located QCLs.

30. The apparatus of claim 29, further comprising:

31. The apparatus of claim 29 or 30, further comprising:

32. The apparatus of claim 31, wherein the first configuration module comprises:

the second configuration module comprises:

33. A network device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor; wherein the processor implements the following steps when executing the program:

34. A computer-readable storage medium, on which a computer program is stored, which program, when executed by a processor, carries out the steps of: