CN112399441A - Wireless link monitoring method and related device - Google Patents

Wireless link monitoring method and related device Download PDF

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Publication number
CN112399441A
CN112399441A CN201910760885.8A CN201910760885A CN112399441A CN 112399441 A CN112399441 A CN 112399441A CN 201910760885 A CN201910760885 A CN 201910760885A CN 112399441 A CN112399441 A CN 112399441A
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China
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channel
reference signal
lbt
indication message
terminal device
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CN201910760885.8A
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CN112399441B (en
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吴霁
张佳胤
贾琼
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN201910760885.8A priority Critical patent/CN112399441B/en
Priority to PCT/CN2020/108953 priority patent/WO2021031980A1/en
Publication of CN112399441A publication Critical patent/CN112399441A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states

Abstract

The embodiment of the application discloses a wireless link monitoring method and a related device, wherein the method comprises the following steps: the network equipment sends a first indication message to the network equipment, and correspondingly, the terminal equipment receives the first indication message; the network equipment sends a second indication message to the network equipment, and correspondingly, the terminal equipment receives the second indication message; the network equipment sends a reference signal to the network equipment on a channel with successful LBT based on the configuration parameter of the reference signal, and correspondingly, the terminal equipment receives the reference signal; and the terminal equipment carries out wireless link monitoring according to the configuration parameters of the reference signals included in the received first indication message, the COT of the reference signals included in the second indication message and the successful channel identification of the LBT. The embodiment of the application can provide a wireless link monitoring scheme suitable for an NR-U scene.

Description

Wireless link monitoring method and related device
Technical Field
The present application relates to the field of communications technologies, and in particular, to a wireless link monitoring method and a related device.
Background
In Long Term Evolution (LTE), a User Equipment (UE) connected to a Radio Resource Control (RRC) layer continuously monitors a downlink reference signal (e.g., a channel state information-reference signal (CSI-RS)) configured by an LTE base station (eNodeB, eNB) for the UE to estimate a radio link quality (or state) between the UE and the base station. The basic workflow of Radio Link Monitoring (RLM) in LTE is as follows: when the Reference Signal Received Power (RSRP) and/or the Reference Signal Received Quality (RSRQ) of the N CSI-RS signals received by the UE continuously are lower than a set threshold, the timer T310 is started. If the RSRP and/or the RSRQ of the M CSI-RS signals continuously received by the UE is higher than the set threshold value before the timer T310 is overtime, the wireless link between the UE and the base station is recovered, the timer T310 stops, and normal communication is carried out between the UE and the base station at the moment; otherwise, the radio link is considered to be failed (failed), and the connection between the UE and the base station needs to be reestablished. Where N, M is a positive integer, N is the threshold of counter N310, and M is the threshold of counter N311.
The basic workflow of RLM in New Radio (NR) of the fifth generation mobile communication (5th-generation, 5G) is similar to that of RLM in LTE, and is not described herein. However, for a NR-U (NR-in-unlicensed spectrum), a base station (gnnodeb, gNB) of the NR-U needs to use a listen-before-talk (LBT) channel contention access mechanism to sense whether a channel is idle before transmitting data, and when the channel is idle, the base station can occupy the channel and transmit data. And because the bandwidth of the NR-U for LBT is 20MHz, that is, when some 1 or some 20MHz bandwidths pass LBT, the gNB or the UE may perform data transmission on the successful bandwidth of LBT. Therefore, when the transmission bandwidth of the CSI-RS is greater than 20MHz (e.g., 80MHz, 160MHz), the gNB may only transmit a part of the CSI-RS because only a part of the transmission bandwidth passes LBT, and the base station of LTE and NR does not need LBT before transmitting data, and the base station may transmit a complete reference signal, so the existing RLM of LTE or NR cannot be applied to the NR-U scenario.
Disclosure of Invention
The embodiment of the application provides a wireless link monitoring method and a related device, and can provide a wireless link monitoring scheme suitable for an NR-U scene.
In a first aspect, an embodiment of the present application provides a method for monitoring a radio link, where the method is applied to a terminal device in radio link monitoring, and the method includes: the terminal equipment receives the first indication message from the network equipment, receives the second indication message from the network equipment, and monitors the wireless link according to the COT of the reference signal, the successful channel identifier of the LBT and the configuration parameters of the reference signal. The first indication message is used for indicating the configuration parameters of the reference signal, and the second indication message is used for indicating the COT and the LBT successful channel identification of the reference signal. When the terminal equipment works in the NR-U system, the terminal equipment determines to carry out wireless link monitoring only on a channel which is successful in LBT by receiving various indication messages without carrying out wireless link monitoring on all channels between the terminal equipment and the network equipment, and a wireless link monitoring scheme suitable for an NR-U scene is provided.
In a possible design, the configuration parameters include a starting transmission time, a transmission period, and a transmission channel, and each of the channels identified by the LBT-successful channel identifier is a channel in the transmission channel. The performing, by the terminal device, radio link monitoring according to the COT of the reference signal, the successful channel identifier of the LBT, and the configuration parameter of the reference signal may include: when it is determined that the network device sends the reference signal within the COT of the reference signal based on the starting transmission time and the transmission period of the reference signal, the terminal device may perform radio link monitoring on each channel identified by the successful channel identifier of the LBT. When the transmission channel configured by the network device for the reference signal is completely the same as the channel successfully LBT of the network device, the terminal device only needs to perform wireless link monitoring on the channel successfully LBT, and a wireless link monitoring scheme under a certain specific condition is provided.
In a possible design, the method for the terminal device to perform radio link monitoring on each channel identified by the above LBT successful channel identifier may specifically be: when the channel quality measured on any channel identified by the successful channel identification of LBT based on the reference signal is less than a first threshold value, the terminal device may perform a first updating operation on the first counter N310; when the channel quality measured on each channel identified by the successful channel identification for LBT based on the reference signal is greater than or equal to the first threshold value, the terminal device may set the value of the first counter N310 to 0. When the value of the first counter N310 is greater than the first threshold, the terminal device may start a timer T310, and may perform radio link reestablishment after the timer T310 expires (indicating that a radio link between the terminal device and the network device fails). Since the first counter N310 is updated when the channel quality measured by the terminal device on any channel where LBT succeeds is less than the threshold, the time that the counter N310 reaches the preset threshold (first threshold) can be shortened, thereby quickly finding out the radio link failure and shortening the time for monitoring the radio link quality.
In a possible design, the performing, by the terminal device, the first updating operation on the first counter N310 may specifically include: the terminal device may determine a weight of each of the channels identified by the successful channel identifier of LBT, and may update the value of the first counter N310 according to a sum of weights of channels whose channel quality is less than the first threshold value among the channels identified by the successful channel identifier of LBT. For example, the value of the first counter N310 is increased by the weight. The terminal device updates the value of the counter N310 according to the weight of the channel, so that the update of the counter N310 is more diversified.
In a possible design, the method for the terminal device to perform radio link monitoring on each channel identified by the above LBT successful channel identifier may further be: if the terminal device does not receive the reference signal on each channel identified by the successful LBT channel identifier, the terminal device may increase the value of the first counter N310 by a fixed value (e.g., 1). If the terminal device receives a reference signal on any one of the channels identified by the above LBT successful channel identifiers, the terminal device may set the value of the first counter N310 to 0. When the value of the first counter N310 is greater than the first threshold, the terminal device may start a timer T310, and may perform radio link reestablishment after the timer T310 expires (indicating that a radio link between the terminal device and the network device fails). A condition is provided that may trigger the update of the counter N310, i.e. a possible scheme for radio link monitoring on the respective channels on which LBT succeeds.
In a possible design, when performing radio link reestablishment, the terminal device may receive a third indication message from the network device, where the third indication message may include a random access parameter corresponding to the reference signal, and may send a preamble sequence to the network device according to the random access parameter to perform radio link reestablishment. The terminal equipment directly receives the random access parameters (namely the time frequency resources of random access) for the reconstruction of the wireless link from the network equipment, and the terminal equipment does not need to acquire specific time frequency resources for random access, so that the time for reconstructing the wireless link can be shortened, and the wireless link can be quickly recovered.
In a possible design, the configuration parameters may further include a transmission time window. The terminal device may perform radio link monitoring within the transmission time window of the reference signal according to the COT of the reference signal and the successful channel identifier of the LBT. The terminal equipment monitors the quality of the wireless link only in the sending time window, continuous monitoring on the whole COT is not needed, the monitoring times of the terminal equipment are reduced, and therefore the power consumption of the terminal equipment is reduced.
In one possible design, the configuration parameters include a starting transmission time, a transmission period, and a transmission channel, and among the channels identified by the LBT successful channel identifier, there are channels different from each of the transmission channels. The performing, by the terminal device, radio link monitoring according to the COT of the reference signal, the successful channel identifier of the LBT, and the configuration parameter of the reference signal may include: when it is determined that the network device sends out the reference signal within the COT of the reference signal based on the starting transmission time and the transmission period of the reference signal, the terminal device may determine, as a first channel, a channel that is the same as each channel of the transmission channels among the channels identified by the channel identifier where the LBT succeeds, where the first channel may include at least one channel; the terminal device may perform radio link monitoring on each of the first channels. When the transmission channel configured by the network device for the reference signal is not identical to the channel successfully LBT of the network device, the terminal device can only perform radio link monitoring on the channel successfully LBT and the channel identical to the transmission channel, and another radio link monitoring scheme under a specific condition is provided.
In a second aspect, an embodiment of the present application provides a radio link monitoring method, where the method is applied to a network device in radio link monitoring, and the method includes: the network device may send a first indication message to the terminal device, send a second indication message, and send a reference signal on each channel where LBT is successful based on configuration parameters of the reference signal. The first indication message includes configuration parameters of a reference signal, where the reference signal is used for radio link monitoring, and the second indication message includes a channel identifier of successful LBT of the network device and a channel occupancy time COT of the reference signal. When the network equipment works in the NR-U system, the network equipment assists the terminal equipment in wireless link monitoring by sending various indication messages, and a wireless link monitoring scheme suitable for the NR-U scene is provided.
In one possible design, the configuration parameters include a start transmission time, a transmission period, and a transmission channel. The network device sends the reference signal on each channel where LBT succeeds based on the configuration parameters of the reference signal, which specifically includes: the network device may transmit the reference signal on the same channels on which LBT succeeds as the channels of the transmission channel based on the transmission start time of the reference signal, the transmission period, and the COT of the reference signal.
In one possible design, the configuration parameter includes a transmission time window, and the transmission time window is used for performing radio link monitoring in combination with the reference signal.
In one possible design, the method further includes: the network device may generate a third indication message and may send the third indication message to the terminal device. Wherein, the third indication message includes a random access parameter corresponding to the reference signal, and the random access parameter is used for radio link reestablishment.
In a third aspect, an embodiment of the present application provides a terminal device, where the terminal device includes a unit and/or a module for performing the radio link monitoring method provided in the first aspect and/or any one of the possible implementations of the first aspect, so that beneficial effects (or advantages) of the radio link monitoring method provided in the first aspect can also be achieved.
In a fourth aspect, the present invention provides a network device, which includes a unit and/or a module for performing the radio link monitoring method provided in the second aspect and/or any one of the possible implementations of the second aspect, so that the beneficial effects (or advantages) of the radio link monitoring method provided in the second aspect can also be achieved.
In a fifth aspect, an embodiment of the present application provides a terminal device, including a processor, a transceiver, and a memory, where the memory is used to store a computer program, and the computer program includes program instructions, and when the processor executes the program instructions, the method for monitoring a radio link according to the first aspect is performed.
In a sixth aspect, an embodiment of the present application provides a network device, including a processor, a transceiver, and a memory, where the memory is used to store a computer program, and the computer program includes program instructions, and when the processor executes the program instructions, the wireless link monitoring method of the second aspect is performed.
In a seventh aspect, an embodiment of the present application provides a computer-readable storage medium, where computer program instructions are stored, and when the computer program instructions are run on the computer, the computer is caused to execute the radio link monitoring method in the first aspect.
In an eighth aspect, the present invention provides a computer-readable storage medium, in which computer program instructions are stored, and when the computer program instructions are run on the computer, the computer is caused to execute the radio link monitoring method in the second aspect.
In a ninth aspect, the present application provides a computer program product, which includes computer program code, when the computer program code runs on a computer, the computer is caused to execute the wireless link monitoring method of the first aspect.
In a tenth aspect, embodiments of the present application provide a computer program product, which includes computer program code, when the computer program code runs on a computer, the computer is caused to execute the wireless link monitoring method of the second aspect.
In an eleventh aspect, an embodiment of the present application provides a communication apparatus, where the communication apparatus has a function of implementing a terminal device in any possible implementation manner of the first aspect. These functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software includes one or more units (or modules) corresponding to the functions.
In a twelfth aspect, an embodiment of the present application provides a communication apparatus, where the communication apparatus has a function of implementing a network device in any possible implementation manner of the first aspect. These functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software includes one or more units (or modules) corresponding to the functions.
In a thirteenth aspect, an embodiment of the present application provides a chip including a processor. The processor is configured to read and execute a computer program stored in the memory to perform the radio link monitoring method in any possible implementation manner of the first aspect or the second aspect. Optionally, the chip further comprises a memory, and the memory is connected with the processor through a circuit or a wire. Further optionally, the chip further comprises a communication interface, and the processor is connected to the communication interface. The communication interface is used for receiving data and/or information needing to be processed, and the processor acquires the data and/or information from the communication interface, processes the data and/or information and outputs a processing result through the communication interface. The communication interface may be an input output interface.
Alternatively, the processor and the memory may be physically separate units, or the memory and the processor may be integrated together.
By implementing the embodiment of the application, on one hand, a radio link monitoring scheme suitable for an NR-U scene can be provided, on the other hand, the time for judging the quality of the radio link under an unlicensed spectrum can be shortened, and the monitoring efficiency of RLM is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below.
FIG. 1 is a system architecture diagram of an NR-U system provided by an embodiment of the present application;
fig. 2 is a schematic flow chart of a radio link monitoring method according to an embodiment of the present application;
FIG. 3 is a schematic illustration of LBT provided by embodiments of the present application;
fig. 4 is a schematic diagram of a terminal device receiving a reference signal according to an embodiment of the present application;
fig. 5 is another schematic flow chart of a radio link monitoring method provided in an embodiment of the present application;
FIG. 6 is another schematic illustration of LBT provided by an embodiment of the present application;
fig. 7 is another schematic diagram of a terminal device receiving a reference signal according to an embodiment of the present application;
FIG. 8 is a flowchart illustrating a first update operation provided by an embodiment of the present application;
fig. 9 is a schematic diagram of updating the first counter N310 according to an embodiment of the present application;
fig. 10 is a schematic diagram of a terminal device RLM provided in an embodiment of the present application;
fig. 11 is a schematic structural diagram of a terminal device provided in an embodiment of the present application;
fig. 12 is a schematic structural diagram of a network device according to an embodiment of the present application;
fig. 13 is a schematic structural diagram of a communication device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
The wireless link monitoring method provided by the embodiment of the application can be applied to an NR-U system and can also be applied to other communication systems working in unlicensed spectrum (unlicensed band). For the sake of understanding, the embodiment of the present application is described by taking an NR-U system as an example. As shown in fig. 1, fig. 1 is a system architecture diagram of an NR-U system provided by an embodiment of the present application. As shown in fig. 1, the UEs 1-6 and the Base Station (BS) may form an NR-U communication system, in which the frequency bands for communication between the UEs 1-6 and the BS are one or more frequency bands in unlicensed spectrum (e.g., 5.925GHz-6.425GHz and 6.525GHz-6.875 GHz). The UEs 1 to 6 may send uplink data to the BS, the BS may receive the uplink data sent by the UEs 1 to 6, and the BS may also send downlink information to the UEs 1 to 6. Optionally, the UEs 4 to 6 may form a small communication system, and in the communication system formed by the UEs 4 to 6, the frequency band for communication between the UEs 4 to 6 may also be a frequency band in an unlicensed spectrum. The UE1, the UE2, the UE3, and the UE5 may send uplink data to the BS, and the BS may send downlink information to the UE1, the UE2, the UE3, and the UE 5; UE4 and UE6 may send uplink data to UE5, and UE5 may also send downlink information to UE4 and UE 6. The UE1, the UE2, the UE3, and the UE5 may monitor a radio link state with the BS, respectively, and then the UE1, the UE2, the UE3, and the UE5 are all terminal devices, and the BS is a network device; UE4 and UE6 may also monitor the radio link status with UE5, respectively, so that UE4 and UE6 are both terminal devices, and UE5 is a network device.
In some possible embodiments, for convenience of description, the present embodiment is described by taking a wireless link between the UE5 and a BS as an example, where the UE5 is a terminal device and the BS is a network device. The frequency bands used by the BS to communicate with the UE5 (UE5 transmits uplink data to the BS, and/or BS transmits downlink information to UE 5) are one or more frequency bands in an unlicensed spectrum (e.g., 5.925GHz-6.425GHz and 6.525GHz-6.875 GHz). The BS may configure the UE5 with a reference signal (the transmission bandwidth of the reference signal may be wideband, i.e., the transmission bandwidth is greater than 20MHz) for monitoring the quality (or status) of the wireless link, such as CSI-RS or a synchronization signal/PBCH block (SS/PBCH block), and may generate a first indication message based on the configured reference signal, where the first indication message may include configuration parameters (e.g., time domain parameters and frequency domain parameters) of the reference signal. The BS may send the first indication message to the UE 5. Due to devices operating in unlicensed spectrum, it is necessary to detect whether a channel is idle and access the channel for operation before transmitting a signal. Therefore, in order to ensure coexistence among devices operating in the unlicensed spectrum, each device operating in the unlicensed spectrum employs a channel contention access mechanism (LBT, also called Carrier Sense Multiple Access (CSMA)) of LBT to avoid collision before transmitting data. Therefore, the BS needs to perform LBT before transmitting data and transmit data on a channel on which LBT succeeds. The BS may perform LBT before transmitting the reference signal, and may generate a second indication message based on a channel on which LBT succeeds, where the second indication message may include a channel identification (LBT) of the LBT succeeds and a Channel Occupancy Time (COT) of the reference signal. Within one COT, the BS may perform downlink transmission on the LBT successful channel, or may schedule the UE5 associated with the BS to perform uplink transmission on the LBT successful channel. The BS may send the second indication message to the UE 5. The BS may transmit the configured reference information on each channel on which LBT succeeds based on the configuration parameters of the reference signal. The UE5 may receive the first indication message from the BS and may receive the second indication message from the BS. The UE5 performs radio link monitoring according to the configuration parameter of the reference signal in the first indication message, the COT of the reference signal in the second indication message, and the successful LBT channel identifier. The second indication message may be sent in the form of downlink control channel (PDCCH) signaling or RRC signaling, such as group-common PDCCH (GC-PDCCH) signaling or UE-specific downlink control channel (UE-specific PDCCH) signaling.
In the embodiment of the present application, when the transmission bandwidth of the reference signal is greater than 20MHz (that is, the transmission bandwidth is a broadband, such as 80MHz or 160NHz, etc.), the BS sends a plurality of different indication messages to the UE, and the UE monitors the quality (or state) of the wireless link between the UE and the BS on the UE side according to the received various indication messages, thereby providing a wireless link monitoring scheme applicable to an NR-U scenario.
The following describes in detail a radio link monitoring method provided in an embodiment of the present application with reference to fig. 2 to 10.
In some possible embodiments, the terminal device in the embodiments of the present application may refer to an entity, such as a UE, on the user side for receiving and/or transmitting signals; a network device in this embodiment may refer to an entity, such as a base station, on a network side for transmitting and/or receiving signals. The wireless link monitoring method provided by the embodiment of the application can be used for monitoring the quality or the state of the wireless link between the terminal equipment and the network equipment.
In some possible embodiments, the channels mentioned in the embodiments of the present application may be equivalent to subbands or carriers, and each channel/subband/subcarrier has a bandwidth of 20 MHz. In the embodiment of the present application, the number of channels included in the transmission channel is the same as the number of subbands included in the transmission bandwidth, and the transmission bandwidth may also be referred to as a bandwidth part (BWP), that is, the BWP may include one or more subbands. For convenience of description, the following will describe a radio link monitoring method provided in the embodiments of the present application by taking a channel as an example.
Referring to fig. 2, fig. 2 is a schematic flow chart of a radio link monitoring method according to an embodiment of the present application. As shown in fig. 2, a method for monitoring a wireless link according to an embodiment of the present application may include:
s201, the network device sends a first indication message to the terminal device. Accordingly, the terminal device receives the first indication message.
In some embodiments, the first indication message may include configuration parameters of the reference signal. The reference signal may be a CSI-RS or a synchronization signal block. The configuration parameters may include time and/or frequency domain parameters such as a starting transmission time, a transmission period, a transmission port, an initial sequence, a transmission bandwidth (and/or a transmission channel), a frame/subframe/symbol where the transmission bandwidth (and/or the transmission channel) is located, a starting Resource Block (RB) position, a number of persistent RBs (RBs), and the like. The first indication message may be sent to the terminal device in the form of signaling, for example, the first indication message is RRC signaling configured by the CSI-RS: NZP-CSI-RS-Resource information element.
In some embodiments, the network device may configure the terminal device with a reference signal for monitoring a radio link state, and may generate the first indication message based on a configuration parameter of the reference signal. The network device may send the first indication message to the terminal device. The first indication message may be used to indicate configuration parameters of the reference signal (or resource information of the reference signal). The network device operates in a communication system of an unlicensed spectrum (e.g., an NR-U system), so that the first indication message may be sent by the network device on the unlicensed frequency band. Therefore, the network device may perform listen before talk LBT before sending the first indication message, and after the LBT of a certain channel is successful, the network device may send the first indication message on the channel on which the LBT is successful. Optionally, the transmission bandwidth of the reference signal configured by the network device for the terminal device may be greater than 20MHz, that is, the reference signal is a wideband reference signal, and the transmission channel of the reference signal includes multiple channels, and the bandwidth of each channel is 20 MHz. For example, assuming that the transmission bandwidth of the reference signal is 80MHz, the transmission channel of the reference signal includes 4 channels. The wideband reference signal in the embodiment of the present application may refer to a reference signal with a transmission bandwidth greater than 20 MHz.
In other embodiments, the network device may configure the terminal device with a set of reference signals for monitoring the radio link status. The transmission bandwidth of each reference signal in the reference signal set may be 20MHz, that is, each reference signal is a narrowband reference signal, and the transmission channel of each reference signal may include 1 channel and may be different from each other. The network device may generate a first indication message based on the configuration parameters of each reference signal in the set of reference signals, and may send the first indication message to the terminal device. The first indication message may be used to indicate configuration parameters of the reference signal (or resource information of the reference signal). The number of channels (or the number of subbands) for the network device to communicate with the terminal device may be determined by a frequency band used for the network device to communicate with the terminal device. For example, the frequency band used by the network device to communicate with the terminal device is 6.1GHz-6.18GHz, which is a total bandwidth of 80MHz, and assuming that the channel bandwidth of each channel is 20MHz, the number of channels (or the number of subbands) used by the network device to communicate with the terminal device is 4 (80/20 is 4), and then the reference signal set includes 4 narrowband reference signals. The narrowband reference signal in the embodiment of the present application may refer to a reference signal with a transmission bandwidth of 20 MHz.
In some embodiments, the wideband reference signal and the narrowband reference signal are different in transmission bandwidth, transmission channel, starting RB position of frequency domain, and number of persistent RBs.
S202, the network equipment sends a second indication message to the terminal equipment. Accordingly, the terminal device receives the second indication message.
In some embodiments, the second indication message may include a channel identifier of a primary channel (primary channel) for which LBT of the network device succeeds and a channel occupancy time COT of the reference signal. The primary channel may be one randomly selected from among the transmission channels of the reference signal. The COT of the reference signal may be used to indicate a maximum occupied time of the network device for occupying the primary channel to transmit the reference signal. The second indication message may be sent to the terminal device in the form of signaling. For example, the second indication message is sent to the terminal device in any one of the following manners: (a) a group common downlink control channel GC-PDCCH signaling or UE-specific downlink control channel (UE-specific PDCCH) signaling in the downlink control channel PDCCH signaling; (b) or increasing the channel identifier of the main channel with successful LBT and the COT of the reference signal in RRC signaling (NZP-CSI-RS-Resource information element) configured by the CSI-RS; (c) or a new RRC signaling (RRC signaling dedicated to indicate the channel identity of the primary channel where LBT succeeds and the COT of the reference signal).
In some embodiments, since the frequency band used by the network device for communicating with the terminal device is an unlicensed frequency band, the network device needs to perform LBT before sending data (or sending downlink information) to avoid data collision. For a wideband reference signal (i.e., a reference signal with a transmission bandwidth greater than 20MHz), the network device may randomly select a channel on the transmission channel of the reference signal, and may use the selected channel as a primary channel. The network device may determine a backoff priority (i.e., an LBT priority) according to the importance and data size of the reference signal to be transmitted on the primary channel, and then may determine a backoff number according to the backoff priority. The backoff number is the number of time slots to wait for listening to the idle channel. The network device may also determine the COT of the reference signal according to the backoff priority. And the network equipment performs back-off interception only on the selected main channel. When it is continuously monitored that the backoff time slots are all idle on the selected primary channel, it indicates that the primary channel is idle at this time, and also indicates that the primary channel LBT succeeds (or the primary channel passes LBT), the network device may generate a second indication message based on the channel identifier of the primary channel that the LBT succeeds and the COT of the reference signal, and may send the second indication message to the terminal device. The second indication message may be used to indicate the successful channel identification of LBT and the COT of the reference signal. When continuously monitoring that a plurality of backoff time slots are all idle on the selected main channel, the network device may perform review of one-slot idle channel assessment (25us clear channel assessment, CCA) on other channels (other channels except the main channel) (back to detect whether the channel is idle at the end time of the last backoff time slot). If a channel is seen back to be idle, data transmission can be carried out on the channel, and if a channel is seen back to be not idle, the channel cannot carry out data transmission at the moment.
For example, as shown in fig. 3, fig. 3 is a schematic diagram of LBT provided in the embodiments of the present application. It is assumed that the transmission channel of the reference signal includes 4 channels, i.e., channels 0,1,2, and 3. Assuming that the network device randomly selects channel 0 from channels 0,1,2, and 3 as a primary channel, the network device determines that the backoff number on channel 0 is 5, and the determined COT of the reference signal is 5 ms. The network device listens on channel 0 whether consecutive 5 time slots are free. If the network device detects that 5 consecutive time slots are all idle on the channel 0, indicating that LBT of the channel 0 is successful, the network device may occupy the channel 0 within 5ms to perform downlink information transmission or schedule the terminal device to perform uplink data transmission. When the network device monitors that 5 consecutive timeslots are all idle on channel 0, the network device may perform one-slot CCA review on channels 1,2, and 3, respectively, as shown in fig. 3, see back that channel 1 and channel 2 are idle, and see back that channel 3 is not idle, then data transmission may be performed on channel 1 and channel 2, which indicates that channel 1 and channel 2 are also successful channels of LBT, and data transmission cannot be performed on channel 3 at this time, which indicates that channel 3 is a failed channel of LBT. The network device may generate GC-PDCCH signaling based on the channel identification (channel 0) of the primary channel (channel 0) for which LBT succeeds and the COT (5ms) of the reference signal, and may transmit the GC-PDCCH signaling to the terminal device. Optionally, if the network device detects on the channel 0 that a certain time slot of the consecutive 5 time slots is not idle, which indicates that LBT of the channel 0 fails, the network device may reselect the primary channel and the backoff number, and perform LBT again.
In some embodiments, when the time that the network device actually occupies the primary channel reaches the COT of the reference signal, the network device needs to perform LBT again to determine the primary channel again, that is, the primary channel may change with time. The network device may notify the terminal device through the second indication message every time the primary channel changes. For example, the time-varying policy for the primary channel may be: the same channel cannot be selected as the primary channel for a period of time (e.g., 10 ms). Optionally, the network device may configure a primary channel with each terminal device associated with the network device, and the primary channel configured by each terminal device may be the same or different.
In other embodiments, for a narrowband reference signal (i.e., a reference signal with a transmission bandwidth of 20MHz), all channels of the network device communicating with the terminal device may become primary channels since the primary channels may vary over time. Therefore, the network device configures a reference signal set for monitoring the wireless link state for the terminal device, the reference signal set comprises a plurality of narrowband reference signals, each narrowband reference signal in the reference signal set can be transmitted on one channel, and the transmission channel of each narrowband reference signal in the reference signal set can be different from each other. The network device may select a narrowband reference signal from the set of reference signals for RLM, and may use the transmission channel of the selected narrowband reference signal as the primary channel. The network device may perform LBT on the primary channel, generate a second indication message based on the channel identifier of the primary channel where LBT succeeds and the COT of the narrowband reference signal determined in the LBT process, and may send the second indication message to the terminal device.
S203, the network device transmits the reference signal on the primary channel with LBT (listen before talk) success based on the configuration parameter of the reference signal. Accordingly, the terminal device receives the reference signal.
In some embodiments, the network device may send the reference signal to the terminal device on the primary channel where LBT succeeds according to the configuration parameters (time domain and frequency domain parameters) of the reference signal, and does not send the reference signal on other channels where LBT succeeds.
If the transmission bandwidth of the reference signal for the RLM configured by the network device to the terminal device is a wide band (greater than 20MHz), the network device sends a partial signal corresponding to the primary channel in the reference signal on the primary channel with successful LBT according to the configuration parameters of the reference signal. For example, assume that the wideband reference signal is a sequence s0,s1,s2,...,sn-1The sequence is transmitted over 4 channels, i.e. channels 0,1,2,3, and each channel is configured with a partial sequence (part sequence) of the sequence, and the partial sequences configured on channels 0,1,2,3 are different from each other. Suppose that the 0 th partial sequence (part0sequence) s of the wideband reference signal is configured on channel 00,s1,s2,...,si-1I is less than n-1; configuring part1 sequence (part1 sequence) s of wideband reference signal on channel 1i,si+1,si+2,...,sjJ is greater than i and less than n-1(ii) a Configuring part2sequence (part2sequence) s of wideband reference signal on channel 2j+1,sj+2,sj+3,...,skK is greater than j and less than n-1; configuring part3sequence (part3sequence) s of wideband reference signal on channel 3k+1,sk+2,sk+3,...,sn-1. The length of each part of the sequence in the broadband reference signal can be the same or different. Assuming that the channel 0 is a primary channel, the network device sends the 0 th part sequence of the wideband reference signal, i.e. s, to the terminal device on the channel 0 (primary channel) where LBT succeeds according to the configuration parameters of the wideband reference signal0,s1,s2,...,si-1That is, when the transmission bandwidth of the reference signal is greater than 20MHz, the network device transmits a partial signal (part sequence) of the complete reference signal (sequence) on the primary channel where LBT succeeds.
If the transmission bandwidth of the reference signal for RLM configured by the network device to the terminal device is a narrow band (equal to 20MHz), the network device sends the reference signal corresponding to the primary channel on the primary channel with successful LBT according to the configuration parameter of the reference signal corresponding to the primary channel. For example, the main channel is channel 0, and the narrowband reference signal configured on the main channel is S0(S0 includes the sequence: S0)0,s01,s02,...,s0n-1) The network device sends the narrowband reference signal S0 (i.e. sequence S0) to the terminal device on LBT successful channel 0 (primary channel) according to the configuration parameters of the narrowband reference signal S00,s01,s02,...,s0n-1)。
And S204, the terminal equipment carries out wireless link monitoring on the primary channel which is successfully LBT and is included in the second indication message according to the configuration parameters of the reference signal included in the received first indication message and the channel occupation time COT of the reference signal included in the second indication message.
In some embodiments, the terminal device may receive the first indication message from the network device, and may receive the second indication message from the network device. The first indication message may include the configuration parameters of the reference signal, and the second indication message may include the COT of the reference signal and the channel identifier of the primary channel on which the LBT of the network device succeeds. The terminal device may detect whether the network device sends the reference signal in the COT based on the initial sending time and the sending period of the configuration parameter. For example, the initial transmission time is 2s, the transmission period is 2s, and the COT lasts 8s from the 3 s. Since the network device transmits the reference signal periodically, the terminal device may determine that the network device transmits the reference signal at 2s for the 1 st time, 4s for the 2 nd time, 6s for the 3 rd time, and so on. Since the COT is 8s from the 3 st, the time (2 nd s) when the network device transmits the reference signal for the 1 st time is not within the COT, and the network device does not transmit the reference signal for the 2 nd s. However, the times of sending the reference signal by the network device 2 nd time and 3 rd time are both within the COT, the terminal device may determine that the network device sends the reference signal within the COT.
If the terminal device determines that the network device has sent the reference signal in the COT, the terminal device may monitor whether the reference signal is received on the primary channel where LBT succeeds based on the frame/subframe/symbol where the reference signal is located in the configuration parameters of the reference signal. Optionally, the terminal device may generate the reference signal sequence according to the initial sequence in the configuration parameters. The terminal device may receive a signal on the primary channel where LBT succeeds, may obtain a sequence of the signal on a frame/subframe/symbol where the reference signal is located, and may perform correlation detection on the obtained sequence and the generated reference signal sequence. When the result of the correlation detection exceeds the correlation threshold, the terminal device determines that the reference signal sent by the network device is received on the primary channel with successful LBT. When the result of the correlation detection does not exceed the correlation threshold, the terminal device determines that the reference signal sent by the network device is not received on the primary channel with successful LBT.
In other embodiments, the configuration parameter may further include a transmission time window (i.e., a monitoring window duration parameter). The transmission time window may also be fixed by a standard (e.g., 5ms or 10ms) without requiring an additional indication message. Alternatively, the duration of the transmission time window configured for the reference signal may be shorter than the transmission period configured for the reference signal. The terminal device may monitor whether the reference signal is received on the primary channel where LBT succeeds within the transmission time window based on the frame/subframe/symbol where the reference signal is located in the configuration parameters of the reference signal. The terminal equipment monitors whether the reference signal is received on the main channel only in the sending time window, so that the frequency of monitoring whether the reference signal is received on the main channel is reduced, and the power consumption of the terminal equipment is reduced.
For example, as shown in fig. 4, fig. 4 is a schematic diagram of a terminal device receiving a reference signal according to an embodiment of the present application. As shown in fig. 4, the reference signal is CSI-RS, and the transmission channel/transmission subband (UE downlink part bandwidth in fig. 4) of the reference signal includes channels 0,1,2,3 (or subbands 0,1,2, 3). The terminal equipment monitors whether the reference signal is received on the primary channel with successful LBT in a sending time window. In fig. 4, on the first two sending time windows, channel 0 is the main channel, and the terminal device monitors that the reference signal is received on channel 0 in sending time windows 0 and 1, respectively; in the last two sending time windows, the main channel changes into channel 3, and the terminal device monitors that the reference signal is received on channel 3 in sending time windows 2 and 3 respectively.
In some embodiments, if the terminal device receives the reference signal on the primary channel where LBT succeeds, the terminal device may measure the channel quality on the primary channel where LBT succeeds based on the reference signal received from the network device. Optionally, the channel quality may be characterized by a Reference Signal Received Power (RSRP) and/or a Reference Signal Received Quality (RSRQ) of the reference signal. The terminal device may measure the RSRP and/or RSRQ of the reference signals received on the primary channel for which LBT was successful. When the measured RSRP and/or RSRQ is smaller than the first threshold, which indicates that the measured channel quality is also lower than the first threshold, the terminal device may perform an update operation a on the first counter N310, for example, increase the value of the first counter N310 by a fixed value (e.g., 1). When the measured RSRP and/or RSRQ is greater than or equal to the first threshold, which indicates that the measured channel quality is also higher than the first threshold, the terminal device may perform an update operation B on the first counter N310, for example, set the value of the first counter N310 to 0. The first threshold may be a preset value.
In other embodiments, if the terminal device does not receive the reference signal sent by the network device on the primary channel where LBT succeeds, the terminal device may perform the above-mentioned updating operation a on the above-mentioned first counter N310.
In some embodiments, when the value of the first counter N310 is greater than the first threshold, the terminal device may start a timer T310, and may perform radio link reestablishment after the timer T310 expires, which indicates that a radio link between the terminal device and the network device fails. The radio link re-establishment procedure may be a random access procedure. Specifically, the method comprises the following steps: (1) the terminal equipment sends a preamble sequence capable of identifying the identity of the terminal equipment on a specific time frequency resource to carry out uplink synchronization; (2) the network equipment detects the preamble sequence at the corresponding time frequency resource, and sends a random access response after the sequence detection is completed; (3) after the terminal equipment sends the preamble sequence, the random access response sent by the base station is detected in a subsequent period of time; (4) the terminal equipment detects a random access response belonging to the terminal equipment, wherein the random access response comprises resource scheduling information for uplink transmission of the terminal equipment; (5) the network device sends a conflict resolution response, and the terminal device judges whether the competition is successful.
In this embodiment, the network device configures a broadband reference signal (a reference signal with a transmission bandwidth greater than 20MHz is a broadband reference signal) to the terminal device, and sends various indication messages (a first indication message and a second indication message) to the terminal device, so as to assist the terminal device in performing wireless link monitoring. And the network equipment sends the partial signals corresponding to the main channel in the broadband reference signal to the terminal equipment only on the main channel with successful LBT. And the terminal equipment receives various indication messages sent by the network equipment and carries out wireless link monitoring on the primary channel with successful LBT based on the various indication messages. An RLM solution for wideband reference signals suitable for NR-U systems is provided.
The radio link monitoring method provided by the embodiment of the application can not only perform RLM on a main channel (one channel) successful in LBT and provide a solution of the RLM for the broadband reference signal applicable to the NR-U system, but also perform RLM on each channel (a plurality of channels) successful in LBT, thereby shortening the time for judging the quality of the radio link under an unlicensed spectrum and improving the monitoring efficiency of the RLM. Referring to fig. 5, fig. 5 is another schematic flow chart of a wireless link monitoring method provided in an embodiment of the present application. As shown in fig. 5, a method for monitoring a wireless link according to an embodiment of the present application may include:
s501, the network device sends a first indication message to the terminal device. Accordingly, the terminal device receives the first indication message.
In some embodiments, the implementation manner of step S501 in the embodiment of the present application may refer to the implementation manner of step S201 in fig. 2, and is not described herein again.
S502, the network device sends a second indication message to the terminal device. Accordingly, the terminal device receives the second indication message.
In some embodiments, the second indication message may include a channel identifier of successful LBT of the network device and the COT of the reference signal. The COT of the reference signal may be used to indicate a maximum occupation time of the network device for transmitting the reference signal on each channel on which LBT succeeds. The second indication message may be sent to the terminal device in the form of signaling. For example, the second indication message is sent to the terminal device in any one of the following manners: (a) GC-PDCCH signaling or UE-specific PDCCH signaling; (b) or increasing the channel identifier of each channel with successful LBT and the COT of the reference signal in RRC signaling (NZP-CSI-RS-Resource information element) configured by the CSI-RS; (c) or a new RRC signaling (RRC signaling dedicated to indicate the channel identity of each channel for which LBT succeeds and the COT of the reference signal).
In some embodiments, the network device needs to perform LBT before sending data. Specifically, the network device may determine the COT of the reference signal according to the backoff priority of each channel. The network device may perform independent back-off listening on multiple channels. When backoff listening on a certain channel is completed, other channels still in backoff listening are waited for. After all channels performing LBT complete backoff listening, the network device may perform data transmission on each channel that the LBT succeeds. The network device may generate a second indication message based on the respective channels for which LBT succeeds and the COT of the reference signal, and may send the second indication message to the terminal device. The second indication message may be used to indicate the successful channel identification of LBT and the COT of the reference signal.
For example, as shown in fig. 6, fig. 6 is another schematic diagram of LBT provided in the embodiments of the present application. Fig. 6 shows 2 LBTs on 4 channels 0,1,2, 3. The network device performs independent backoff listening on channels 0,1,2, and 3, respectively. For convenience of description, the first LBT on 4 channels, i.e. channels 0,1,2, and 3, is taken as an example. As shown in fig. 6, the backoff number on channel 0 is 3, and when channel 0 continuously senses that 3 timeslots are idle, which indicates that LBT of channel 0 is successful, it waits for other channels still being monitored in backoff; after continuously listening that 2 time slots are idle on the channel 1, the channel 1 is occupied by other devices (Wi-Fi nodes in fig. 6), that is, LBT of the channel 1 fails; the backoff number on the channel 2 is 4, when the channel 2 continuously senses that 4 time slots are idle, the LBT of the channel 2 is successful, and other channels which are still monitored in a backoff mode are waited; the backoff number on the channel 3 is 7, when the channel 3 continuously senses that 6 timeslots are all idle, one-slot CCA is simultaneously reviewed on the channels 0,2, and 3, and if the channels 0,2, and 3 are all idle, the network device may simultaneously perform data transmission on the channels 0,2, and 3, where the channels where LBT succeeds at this time include the channels 0,2, and 3. Optionally, if the network device backs off and senses that none of the 4 channels 0,1,2, and 3 are idle, which indicates that there is no channel for which LBT is successful, the network device may perform LBT again.
In some embodiments, the execution sequence between step S501 and step S502 in the embodiments of the present application is not limited. For example, step S501 may be performed before step S502, step S501 may be performed after step S502, step S501 may be performed simultaneously with step S502, and so on.
S503, the network device transmits the reference signal on each channel where LBT (listen before talk) succeeds based on the configuration parameters of the reference signal. Accordingly, the terminal device receives the reference signal.
In some embodiments, the transmission bandwidth of the reference signal is broadband (greater than 20 MHz). If each of the channels that the LBT succeeds is a channel in the transmission channel of the reference signal, the network device may send, according to the configuration parameters (time domain and frequency domain parameters) of the reference signal, a partial signal corresponding to each channel in the reference signal to the terminal device on each channel that the LBT succeeds. For example, assuming that the transmission channels of the reference signal include channels 0,1,2,3, and the channels for which LBT succeeds include channels 0,2,3, each channel ( channel 0,2,3) indicating that LBT succeeds belongs to a channel ( channel 0,1,2,3) in the transmission channels of the reference signal, that is, it indicates that the reference signal can be transmitted on each channel for which LBT succeeds. If the reference signal is a sequence, the 0 th part sequence of the reference signal is configured on the channel 0, the 1 st part sequence of the reference signal is configured on the channel 1, the 2 nd part sequence of the reference signal is configured on the channel 2, the 3 rd part sequence of the reference signal is configured on the channel 3, and the 0 th, 1 st, 2 nd and 3 rd part sequences jointly form the reference signal. The network equipment transmits the 0 th part sequence of the reference signal to the terminal equipment on a channel 0 according to the configuration parameters of the reference signal, transmits the 2 nd part sequence of the reference signal to the terminal equipment on a channel 2, and transmits the 3 rd part sequence of the reference signal to the terminal equipment on a channel 3.
In some embodiments, if there is a channel different from the transmission channel of the reference signal in the respective channels that are successful in LBT, the network device may determine an intersection between the respective channels that are successful in LBT and the respective channels of the transmission channel, and may send, to the terminal device, a partial signal corresponding to each channel in the reference signal on each channel of the intersection according to the configuration parameters (time domain and frequency domain parameters) of the reference signal. For example, the respective channels for which LBT succeeds are channels 0,2, and 3, respectively, and the transmission channel includes channel 0 and channel 3, then the intersection between the respective channels for which LBT succeeds and the respective channels of the transmission channel is channel 0 and channel 3. The network device sends the partial signal corresponding to the channel 0 in the reference signal to the terminal device on the channel 0 according to the configuration parameter of the reference signal, and sends the partial signal corresponding to the channel 3 in the reference signal to the terminal device on the channel 3.
In some embodiments, the network device may send a third indication message to the terminal device. Accordingly, the terminal device may receive the reference signal from the network device. The third indication message is used for the terminal device to perform radio link reestablishment when Radio Link Failure (RLF) is monitored. The third indication message may include the random access parameter corresponding to the reference signal. The random access parameter may be a time-frequency resource in a random access process. The reference signal (which may be a complete reference signal or a partial signal in the complete reference signal) configured on each channel in the transmission channels of the reference signal may correspond to a time-frequency resource for random access (or radio link reconstruction); or the reference signal (here, a complete reference signal) configured on all channels in the transmission channel of the reference signal may correspond to a time-frequency resource for random access (or radio link reconstruction), which is not limited in this embodiment of the present application.
S504, the terminal device monitors the wireless link according to the configuration parameters of the reference signal included in the received first indication message, the channel occupation time COT of the reference signal included in the second indication message, and the channel identifier of the successful LBT.
In some embodiments, each channel identified by the LBT-successful channel identifier is a channel in the transmission channel of the reference signal. The terminal device may receive the first indication message from the network device, and may receive the second indication message from the network device. The first indication message may include the configuration parameters of the reference signal, and the second indication message may include the COT of the reference signal and the channel identifier of successful LBT of the network device. The terminal device may detect whether the network device sends the reference signal in the COT based on the initial sending time and the sending period of the configuration parameter. If the terminal device determines that the network device has sent the reference signal in the COT, the terminal device may perform radio link monitoring on each channel identified by the successful channel identifier of LBT.
In other embodiments, there are different channels from the transmission channels in the channels identified by the LBT successful channel identifier. If the terminal device determines that the network device has sent the reference signal in the COT based on the initial sending time and the sending period of the reference signal, the terminal device may determine, as a first channel, a channel that is the same as each channel of the transmission channel among the channels identified by the channel identifier with successful LBT, where the first channel may include at least one channel. The terminal device may perform radio link monitoring on each of the first channels.
In some embodiments, the monitoring of the wireless link on the respective channels identified by the successful channel identification for LBT may include: the terminal device may monitor whether the reference signal is received on each channel identified by the channel identifier with successful LBT based on the frame/subframe/symbol where the reference signal is located in the configuration parameter. When the channel quality measured on any channel identified by the successful channel identification of LBT based on the received reference signal is less than the first threshold value, the terminal device performs a first updating operation on the first counter N310. The first update operation may be: the terminal device determines the number of channels with the channel quality smaller than the first threshold value measured on each channel identified by the successful channel identifier of LBT, and increases the value of the first counter N310 by the number of channels. For example, if the number of channels whose measured channel quality is smaller than the first threshold value is 3, the terminal device increases the value of the first counter N310 by 3. When the channel quality measured on each channel identified by the successful channel identification for LBT based on the received reference signal is greater than or equal to the first threshold, the terminal device performs a second updating operation on the first counter N310. The second update operation may be to set the value of the first counter N310 to 0. When the value of the first counter N310 is greater than the first threshold, the terminal device may start a timer T310, and after the timer T310 expires, it indicates that the radio link between the terminal device and the network device fails, and performs radio link reestablishment. The terminal device performs RLM on each channel where LBT succeeds, so that the time for the counter N310 to reach a preset threshold (first threshold) can be shortened, thereby quickly discovering that the radio link fails and shortening the time for monitoring the quality (state) of the radio link.
Optionally, if the terminal device does not receive the reference signal on any channel identified by the successful channel identifier of LBT, the terminal device may perform a third updating operation on the first counter N310. The third update operation may be: the terminal equipment determines the number of channels on which the reference signal is not received on each channel identified by the successful channel identification of the LBT, and increases the value of the first counter N310 by the number of channels. For example, if the number of channels on which the reference signal is not received on each channel identified by the successful LBT channel identification is 2, the terminal device increases the value of the first counter N310 by 2. When the value of the first counter N310 is greater than the first threshold, the terminal device may start a timer T310, and after the timer T310 expires, it indicates that the radio link between the terminal device and the network device fails, and performs radio link reestablishment.
Further optionally, if the terminal device does not receive the reference signal on each channel identified by the successful channel identifier of LBT, the terminal device may perform a fourth updating operation on the first counter N310. The fourth update operation may be: the value of the first counter N310 is incremented by a fixed value (e.g., 1). If the terminal device receives the reference signal on any one of the channels identified by the successful channel identifier of LBT, the terminal device may set the value of the first counter N310 to 0. When the value of the first counter N310 is greater than the first threshold, the terminal device may start a timer T310, and after the timer T310 expires, it indicates that the radio link between the terminal device and the network device fails, and performs radio link reestablishment.
In some embodiments, the configuration parameters may further include a transmission time window. The monitoring, by the terminal device, whether the reference signal is received on each channel identified by the successful LBT channel identifier may specifically include: and the terminal equipment monitors whether the reference signal is received on each channel identified by the successful channel identification of the LBT in a sending time window based on the frame/subframe/symbol of the reference signal in the configuration parameters.
For example, as shown in fig. 7, fig. 7 is another schematic diagram that a terminal device provided in the embodiment of the present application receives a reference signal. As shown in fig. 7, the reference signal is CSI-RS, and the transmission channel/transmission subband of the reference signal includes channels 0,1,2,3 (or subbands 0,1,2, 3). In the 1 st sending time window, the channel identifiers of LBT success are 0,1,3, and the terminal device monitors that the channels 0,1,3 all receive the reference signal in the 1 st sending time window. In the 2 nd transmission time window, the channel identifier of LBT success is 0, and the terminal device monitors that the reference signal is received on the channel 0 in the 2 nd transmission time window. In the 3 rd transmission time window, the channel identifiers of successful LBT are 1,2, and the terminal device monitors that both channels 1 and 2 receive the reference signal in the 3 rd transmission time window. In the 4 th transmission time window, the channel identifier of LBT success is 0,2, and the terminal device monitors that both channels 0 and 2 receive the reference signal in the 4 th transmission time window.
In some embodiments, the radio link re-establishment procedure may be a one-time random access procedure. Specifically, the performing, by the terminal device, the radio link reestablishment may include: when the terminal device initiates the radio link re-establishment, the terminal device may still receive the reference signal sent by the network device. The network device configures the reference signal with the corresponding random access parameter, and sends the reference signal to the terminal device through the third indication message. Therefore, the terminal device may receive the third indication message from the network device, and may send the preamble sequence to the network device for random access according to the random access parameter carried in the third indication message, so as to implement the reestablishment of the wireless link. The terminal equipment directly receives the random access parameters (namely the time frequency resources of random access) for the reconstruction of the wireless link from the network equipment, and the terminal equipment does not need to acquire specific time frequency resources for random access, so that the time for reconstructing the wireless link can be shortened, and the wireless link can be quickly recovered.
As an alternative implementation, the flow of the first update operation may also be as shown in fig. 8, where fig. 8 is a schematic flow diagram of the first update operation provided in this embodiment of the application.
S801, the terminal device determines the weight of each channel in the channels identified by the channel identification with successful LBT.
In some embodiments, the weight of each of the channels identified by the successful LBT channel identification may be the same or different. The sum of the weights of the individual channels identified by the successful LBT channel identification is 1. For example, if the channel identified by the successful LBT identifier is 4 channels, i.e. channels 0,1,2, and 3, the weights of channels 0,1,2, and 3 may be the same, i.e. the weights of channels 0,1,2, and 3 are 1/4; the weights of channels 0,1,2, and 3 may also be different, such as 1/2,1/4,1/8, and 1/8 for channels 0,1,2, and 3, respectively. Optionally, the weight of each channel in the respective channels identified by the successful LBT channel identifier may also be configured by the network device, and then sent to the terminal device.
S802, the terminal equipment updates the value of the first counter according to the sum of the weights of the channels with the channel quality smaller than the first threshold value in each channel identified by the LBT successful channel identification.
In some embodiments, the terminal device may determine channels whose channel quality measured on each channel identified by the LBT-successful channel identifier is less than the first threshold, and may calculate a sum of weights of the channels whose channel quality is less than the first threshold. The terminal device may increase the value of the above-mentioned first counter N310 by the sum of the weights.
As shown in fig. 9, fig. 9 is a schematic diagram of updating the first counter N310 according to the embodiment of the present application. Fig. 9 shows the variation of the value of the counter N310 in one COT. Within one COT, the channel on which the LBT succeeds does not change. Assume that the channels for which LBT succeeds in fig. 9 are identified as 0,1,2, 3. Rule 1(rule 1) indicates that the weight of each of channels 0,1,2,3 is the same, 1/4; rule 2(rule 2) indicates that the weight of each of channels 0,1,2, and 3 is different, e.g., the weights of channels 0,1,2, and 3 are 1/2,1/4,1/8, and 1/8, respectively. Assuming rule 1, the value of counter N310 is denoted N1; under rule 2, the value of counter N310 is denoted by N2. In the 1 st sending time window, if the channel quality measured on the channels 0,1,2,3 is all greater than or equal to the first threshold, then both N1 and N2 are 0. In the 2 nd transmission time window, only if the channel quality measured on the channel 2 is greater than or equal to the first threshold value, N1 is (1/4) × 3 ═ 3/4, and N2 is 1/2+1/4+1/8 ═ 7/8. In the 3 rd transmission time window, only if the channel quality measured on the channels 0 and 3 is greater than or equal to the first threshold, N1 is 3/4+ (1/4) × 2 is 5/4, and N2 is 7/8+1/4+1/8 is 5/4. In the 4 th transmission time window, if the channel qualities measured on the channels 1,2, and 3 are all greater than or equal to the first threshold, N1 is 5/4+1/4 is 3/2, and N2 is 5/4+1/4+1/8+1/8 is 7/4.
As another alternative, the network device sends the second indication message periodically. And the terminal equipment receives the first indication message from the network equipment. If the terminal device does not receive the second indication message within a sending time window, which indicates that the terminal device cannot determine which channels the network device LBT succeeds within the sending time window, the terminal device may buffer the reference signal received within the sending time window. Since the second indication message includes the successful channel identifier of LBT and the COT of the reference signal, and because the successful channel of LBT does not change in one COT, the successful channel identifier of LBT does not change, that is, the second indication messages periodically sent by the network device in one COT are the same. Therefore, when the terminal device receives the second indication message sent next by the network device, the terminal device may measure the channel quality on each channel identified by the channel identifier of the LBT success included in the received second indication message, in combination with the reference signal buffered last time. When the measured channel quality is smaller than the first threshold, the terminal device may perform the first updating operation on the first counter N310.
Optionally, if the terminal device does not receive the second indication message within a sending time window, which indicates that the terminal device cannot determine which channels the network device LBT succeeds, the terminal device may buffer the reference signal received within the sending time window, and may measure the channel quality on each channel of the transmission channels based on the reference signal received within the sending time window. When the measured channel quality is smaller than the first threshold, the terminal device may perform a first updating operation on the first counter N310. When the terminal device receives the second indication message sent by the network device next time, the terminal device may correct the value of the first counter N310 by combining the last buffered reference signal. When the terminal equipment does not receive the second indication message in a certain sending time window, two different processing modes are provided, and the solution of wireless link monitoring under the NR-U scene is enriched.
For example, as shown in fig. 10, fig. 10 is a schematic diagram of a terminal device RLM provided in the embodiment of the present application. Fig. 10 shows a case where the terminal device performs RLM channels within 4 transmission time windows. The reference signal is assumed to be a CSI-RS, and the second indication message is a GC-PDCCH. In the 1 st sending time window, if the channel identifiers of successful LBT carried by the GC-PDCCH received by the terminal device are 0,1, and 3, the terminal device measures the channel quality on the channels 0,1, and 3, respectively. In the 2 nd transmission time window, the terminal device does not receive the GC-PDCCH, and the terminal device cannot determine which channels are successful in LBT in the 2 nd transmission time window, and at this time, it may be assumed that all channels 0,1,2, and 3 are successful in LBT, that is, it is assumed that the network device transmits CSI-RS on channels 0,1,2, and 3, so the terminal device measures channel quality on channels 0,1,2, and 3, respectively. After the terminal device receives the GC-PDCCH sent by the network device next time, the terminal device measures the channel quality on the channels (i.e. channels 2 and 3 in fig. 10) on which LBT actually succeeds in the 2 nd sending time window in combination with the last buffered reference signal (i.e. CSI-RS actually transmitted by the network device in the 2 nd sending time window in fig. 10). In the 3 rd transmission time window, if the channel identifier of successful LBT carried by the GC-PDCCH received by the terminal device is 1,2, the terminal device measures the channel quality on channels 1 and 2, respectively. In the 4 th transmission time window, if the channel identifiers, which are carried by the GC-PDCCH and successfully receive the LBT, are 1 and 3, the terminal device measures the channel quality on the channels 1 and 3, respectively.
In the embodiment of the present application, a network device configures a broadband reference signal (a reference signal with a transmission bandwidth greater than 20MHz is a broadband reference signal) to a terminal device, and sends various indication messages (a first indication message and a second indication message) to the terminal device to assist the terminal device in performing wireless link monitoring, and also sends a third indication message to the terminal device to perform wireless link reconstruction when a wireless link fails. And the network equipment sends partial signals corresponding to the channels with successful LBT in the broadband reference signals to the terminal equipment on the channels with successful LBT. And the terminal equipment receives various indication messages sent by the network equipment, monitors a radio link on each channel with successful LBT based on the various indication messages, and reestablishes the radio link based on the random access parameters in the third indication message when the radio link fails. The method not only provides a solution for the RLM of the broadband reference signal suitable for the NR-U system, but also shortens the time for judging the quality of the radio link under the unlicensed spectrum and the time (or flow) for rebuilding the radio link, and improves the monitoring efficiency of the RLM.
The foregoing describes in detail a wireless link monitoring method according to an embodiment of the present application, and in order to better implement the foregoing scheme according to the embodiment of the present application, the embodiment of the present application further provides a corresponding device.
Referring to fig. 11, fig. 11 is a schematic structural diagram of a terminal device provided in an embodiment of the present application. As shown in fig. 11, the terminal device 10 may include:
the transceiver module 101 is configured to receive a first indication message from a network device and receive a second indication message from the network device. The first indication message includes configuration parameters of a reference signal, and the second indication message includes a channel identifier that the network device listens before talks LBT successfully and a channel occupancy time COT of the reference signal. A processing module 102, configured to perform radio link monitoring according to the COT of the reference signal in the second indication message received by the transceiver module, the successful channel identifier of the LBT, and the configuration parameter of the reference signal in the first indication message.
In some embodiments, the configuration parameters include a starting transmission time, a transmission period, and a transmission channel, and each of the channels identified by the LBT-successful channel identifier is a channel in the transmission channel. The processing module 102 is specifically configured to perform radio link monitoring on each channel identified by the successful channel identifier of LBT when it is determined that the network device sends the reference signal within the COT of the reference signal based on the initial sending time and the sending period of the reference signal.
In some embodiments, the processing module 102 includes an updating unit 1021 and a link rebuilding unit 1022. The updating unit 1021, configured to perform a first updating operation on the first counter N310 when the channel quality measured on any one of the channels identified by the LBT successful channel identification based on the reference signal is less than a first threshold value. The link reestablishing unit 1022 is configured to start the timer T310 when the value of the first counter N310 is greater than a first threshold, and reestablish the radio link after the timer T310 expires.
In some embodiments, the update unit 1021 is specifically configured to: determining a weight of each channel in the channels identified by the successful channel identification of the LBT; and updating the value of the first counter N310 according to the sum of the weights of the channels with the channel quality less than the first threshold value in each channel identified by the successful channel identification of LBT.
In some embodiments, the transceiver module 101 is further configured to receive a third indication message from the network device, where the third indication message includes the random access parameter corresponding to the reference signal. The link reestablishing unit 1022 is specifically configured to send a preamble sequence to the network device according to the random access parameter to reestablish the radio link when the radio link is reestablished.
In some embodiments, the configuration parameter includes a transmission time window. The processing module 102 is further specifically configured to perform radio link monitoring within the sending time window of the reference signal of the first indication message received by the transceiver module according to the COT of the reference signal and the successful channel identifier of the LBT in the second indication message received by the transceiver module.
In some embodiments, the configuration parameters include a starting transmission time, a transmission period, and a transmission channel, and the LBT successful channel identifier identifies that different channels exist in the different channels identified by the transmission channel. The processing module 102 is further specifically configured to determine, as a first channel, a channel that is the same as each channel of the transmission channels and is identified by the successful LBT channel identifier, when it is determined that the network device sends the reference signal within the COT of the reference signal based on the initial sending time and the sending period of the reference signal, where the first channel includes at least one channel; radio link monitoring is performed on each of the first channels.
The updating unit 1021 and the link rebuilding unit 1022 may be a single unit, such as a processing unit.
In a specific implementation, the implementation of each module or unit may also correspond to the corresponding description of the terminal device in the method embodiment shown in fig. 2, fig. 5, or fig. 8, and execute the method and the function executed by the terminal device in the foregoing embodiment.
When the terminal device works in the NR-U system, the terminal device determines to perform wireless link monitoring only on a channel which is successful in LBT by receiving various indication messages, and does not need to perform wireless link monitoring on all channels between the terminal device and the network device, thereby providing a wireless link monitoring scheme suitable for an NR-U scene.
Referring to fig. 12, fig. 12 is a schematic structural diagram of a network device according to an embodiment of the present application. As shown in fig. 12, the network device 20 may include:
a transceiver module 201, configured to send the first indication message to a terminal device, send the second indication message to the terminal device, and send the reference signal on each channel where LBT succeeds based on the configuration parameters of the reference signal. The first indication message includes configuration parameters of a reference signal, where the reference signal is used for radio link monitoring, and the second indication message includes a channel identifier of successful LBT of the network device and a channel occupancy time COT of the reference signal.
In some embodiments, the configuration parameters include a start transmission time, a transmission period, and a transmission channel. The transceiver module 201 is specifically configured to transmit the reference signal on the same channel as each channel of the transmission channel, where LBT succeeds, based on the transmission start time and the transmission period of the reference signal and the COT of the reference signal.
In some embodiments, the configuration parameter includes a transmission time window, and the transmission time window is used for performing radio link monitoring in combination with the reference signal.
In some embodiments, the network device 20 further includes a processing module 202. The processing module 202 is configured to generate a third indication message, where the third indication message includes a random access parameter corresponding to the reference signal, and the random access parameter is used for radio link reestablishment. The transceiver module 201 is further configured to send the third indication message to the terminal device.
In a specific implementation, the implementation of each unit may also correspond to the corresponding description of the network device in the method embodiment shown in fig. 2 or fig. 5, and execute the method and the function executed by the network device in the foregoing embodiment.
Referring to fig. 13, fig. 13 is a schematic structural diagram of a communication device according to an embodiment of the present application. As shown in fig. 13, a communication device 1000 provided in the embodiment of the present application includes a processor 1001, a memory 1002, a transceiver 1003, and a bus system 1004. The communication device provided by the embodiment of the application can be any one of terminal equipment and network equipment.
The processor 1001, the memory 1002, and the transceiver 1003 are connected by a bus system 1004.
The memory 1002 is used for storing programs. In particular, the program may include program code including computer operating instructions. The memory 1002 includes, but is not limited to, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), or a portable read-only memory (CD-ROM). Only one memory is shown in fig. 10, but of course, the memory may be provided in plural numbers as necessary. The memory 1002 may also be a memory in the processor 1001, which is not limited herein.
The memory 1002 stores elements, executable units or data structures, or subsets thereof, or expanded sets thereof:
and (3) operating instructions: including various operational instructions for performing various operations.
Operating the system: including various system programs for implementing various basic services and for handling hardware-based tasks.
The processor 1001 controls the operation of the communication device 1000, and the processor 1001 may be one or more Central Processing Units (CPUs), and in the case where the processor 1001 is one CPU, the CPU may be a single-core CPU or a multi-core CPU.
In a particular application, the various components of the communications device 1000 are coupled together by a bus system 1004, where the bus system 1004 may include a power bus, a control bus, a status signal bus, and the like, in addition to a data bus. For clarity of illustration, however, the various buses are labeled as bus system 1004 in FIG. 13. For ease of illustration, it is only schematically drawn in fig. 13.
Fig. 2, fig. 5 or fig. 8 provided in the foregoing embodiments of the present application, or a method of a terminal device disclosed in each of the foregoing embodiments; or fig. 2 or fig. 5 provided in the foregoing embodiment of the present application, or the method of the network device in the foregoing embodiments may be applied to the processor 1001, or implemented by the processor 1001. The processor 1001 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be implemented by integrated logic circuits of hardware or instructions in the form of software in the processor 1001. The processor 1001 may be 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, or discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 1002, and the processor 1001 reads the information in the memory 1002, and executes, in conjunction with hardware thereof, the method steps of fig. 2, fig. 5, or fig. 8, or the terminal device described in the foregoing embodiments; or in combination with hardware thereof, to perform the method steps of fig. 2 or fig. 5, or the network device as described in the various embodiments above.
Embodiments of the present application also provide a computer program product comprising computer program code to, when run on a computer, cause the computer to perform the method steps of the terminal device described in fig. 2, 5 or 8; or cause the computer to perform the method steps of the network device described in fig. 2 or fig. 5, when the computer program code runs on the computer.
The embodiment of the application also provides a chip which comprises a processor. The processor is configured to read and execute a computer program stored in the memory to perform the wireless link monitoring method in any possible implementation of fig. 2, 5 or 8. Optionally, the chip further comprises a memory, and the memory is connected with the processor through a circuit or a wire. Further optionally, the chip further comprises a communication interface, and the processor is connected to the communication interface. The communication interface is used for receiving data and/or information needing to be processed, and the processor acquires the data and/or information from the communication interface, processes the data and/or information and outputs a processing result through the communication interface. The communication interface may be an input output interface.
Alternatively, the processor and the memory may be physically separate units, or the memory and the processor may be integrated together.
One of ordinary skill in the art will appreciate that all or part of the processes in the methods of the above embodiments may be implemented by hardware related to instructions of a computer program, which may be stored in a computer-readable storage medium, and when executed, may include the processes of the above method embodiments. And the aforementioned storage medium includes: various media capable of storing program codes, such as ROM or RAM, magnetic or optical disks, etc.

Claims (26)

1. A method of wireless link monitoring, comprising:
the method comprises the steps that terminal equipment receives a first indication message from network equipment, wherein the first indication message comprises configuration parameters of a reference signal;
the terminal device receives a second indication message from the network device, where the second indication message includes a channel identifier that the network device listens before talks LBT successfully and a channel occupation time COT of the reference signal;
and the terminal equipment monitors a wireless link according to the COT of the reference signal, the successful channel identifier of the LBT and the configuration parameter of the reference signal.
2. The method of claim 1, wherein the configuration parameters include a starting transmission time, a transmission period, and a transmission channel, and each channel identified by the successful LBT channel identifier is a channel in the transmission channel;
the terminal device performs radio link monitoring according to the COT of the reference signal, the channel identifier of the successful LBT and the configuration parameter of the reference signal, and includes:
and if the network equipment is determined to send the reference signal in the COT of the reference signal based on the initial sending time and the sending period of the reference signal, the terminal equipment carries out wireless link monitoring on each channel identified by the channel identification with successful LBT.
3. The method of claim 2, wherein the terminal device performs radio link monitoring on each channel identified by the LBT-successful channel identifier, comprising:
if the channel quality measured on any channel identified by the successful channel identification of the LBT based on the reference signal is less than a first threshold value, the terminal device performs a first updating operation on a first counter N310;
when the value of the first counter N310 is greater than a first threshold, the terminal device starts a timer T310, and performs radio link reestablishment after the timer T310 times out.
4. The method of claim 3, wherein performing the first update operation on the first counter comprises:
determining a weight of each of the channels identified by the successful channel identification for the LBT;
and updating the value of the first counter N310 according to the sum of the weights of the channels with the channel quality smaller than the first threshold value in each channel identified by the successful channel identification of LBT.
5. The method according to claim 3 or 4, wherein the performing radio link re-establishment comprises:
the terminal device receives a third indication message from the network device, wherein the third indication message comprises a random access parameter corresponding to the reference signal;
and the terminal equipment sends a preamble sequence to the network equipment according to the random access parameter to carry out wireless link reconstruction.
6. The method of any of claims 1-5, wherein the configuration parameters include a transmission time window;
the terminal device performs radio link monitoring according to the COT of the reference signal, the channel identifier of the successful LBT and the configuration parameter of the reference signal, and includes:
and the terminal equipment monitors a wireless link in a sending time window of the reference signal according to the COT of the reference signal and the successful channel identifier of the LBT.
7. The method of claim 1, wherein the configuration parameters comprise a starting transmission time, a transmission period, and a transmission channel, and wherein the LBT-successful channel identifier identifies that different channels exist in the channels identified by the LBT-successful channel identifier than the channels of the transmission channel;
the terminal device performs radio link monitoring according to the COT of the reference signal, the channel identifier of the successful LBT and the configuration parameter of the reference signal, and includes:
if it is determined that the network device sends the reference signal within the COT of the reference signal based on the initial sending time and the sending period of the reference signal, the terminal device determines, as a first channel, a channel that is the same as each channel of the transmission channels in each channel identified by the channel identifier that the LBT succeeds, where the first channel includes at least one channel;
and the terminal equipment carries out wireless link monitoring on each channel of the first channel.
8. A method of wireless link monitoring, comprising:
the network equipment sends the first indication message to terminal equipment, wherein the first indication message comprises configuration parameters of a reference signal, and the reference signal is used for wireless link monitoring;
the network device sends the second indication message to the terminal device, where the second indication message includes a channel identifier of the successful LBT of the network device and a channel occupation time COT of the reference signal;
the network equipment transmits the reference signals on various channels with successful LBT based on the configuration parameters of the reference signals.
9. The method of claim 8, wherein the configuration parameters include a start transmission time, a transmission period, and a transmission channel;
the network device sends the reference signal on each channel with successful LBT based on the configuration parameters of the reference signal, and the method comprises the following steps:
and the network equipment transmits the reference signals on the same channels of each channel with successful LBT and each channel of the transmission channels based on the transmission starting time, the transmission period and the COT of the reference signals.
10. The method according to claim 8 or 9, wherein the configuration parameters comprise a transmission time window for radio link monitoring in combination with the reference signal.
11. The method according to any one of claims 8-10, further comprising:
the network device generates a third indication message, wherein the third indication message comprises a random access parameter corresponding to the reference signal, and the random access parameter is used for wireless link reconstruction;
and the network equipment sends the third indication message to the terminal equipment.
12. A terminal device, comprising:
a transceiver module, configured to receive a first indication message from a network device, where the first indication message includes a configuration parameter of a reference signal;
the transceiver module is further configured to receive a second indication message from the network device, where the second indication message includes a channel identifier of the network device that the listen before talk LBT succeeds and a channel occupancy time COT of the reference signal;
a processing module, configured to perform radio link monitoring according to the COT of the reference signal in the second indication message received by the transceiver module, the successful channel identifier of the LBT, and the configuration parameter of the reference signal in the first indication message.
13. The terminal device according to claim 12, wherein the configuration parameters include a starting transmission time, a transmission period, and a transmission channel, and each channel identified by the successful LBT channel identifier is a channel in the transmission channel;
the processing module is specifically configured to:
and when the network equipment is determined to send the reference signal in the COT of the reference signal based on the initial sending time and the sending period of the reference signal, carrying out wireless link monitoring on each channel identified by the successful channel identification of the LBT.
14. The terminal device of claim 13, wherein the processing module comprises:
an updating unit, configured to perform a first updating operation on the first counter N310 when a channel quality measured on any one of the channels identified by the successful channel identification for LBT based on the reference signal is less than a first threshold value;
a link reestablishing unit, configured to start a timer T310 when the value of the first counter N310 is greater than a first threshold, and perform radio link reestablishment after the timer T310 times out.
15. The terminal device according to claim 14, wherein the updating unit is specifically configured to:
determining a weight of each of the channels identified by the successful channel identification for the LBT;
and updating the value of the first counter N310 according to the sum of the weights of the channels with the channel quality smaller than the first threshold value in each channel identified by the successful channel identification of LBT.
16. The terminal device according to claim 14 or 15, wherein the transceiver module is further configured to receive a third indication message from the network device, where the third indication message includes a random access parameter corresponding to the reference signal;
when the link reestablishment unit reestablishes the wireless link, the link reestablishment unit is specifically configured to:
and sending a preamble sequence to the network equipment according to the random access parameter to reconstruct the wireless link.
17. A terminal device according to any of claims 12-16, wherein the configuration parameters comprise a transmission time window;
the processing module is further specifically configured to:
and according to the COT of the reference signal and the channel identifier of the successful LBT in the second indication message received by the transceiver module, performing radio link monitoring in a sending time window of the reference signal of the first indication message received by the transceiver module.
18. The terminal device according to claim 12, wherein the configuration parameters include a starting transmission time, a transmission period, and a transmission channel, and wherein the LBT-successful channel identifier identifies that there are different channels from the transmission channels;
the processing module is further specifically configured to:
when it is determined that the network device sends the reference signal within the COT of the reference signal based on the initial sending time and the sending period of the reference signal, determining a channel, which is the same as each channel of the transmission channels, in each channel identified by the channel identifier with successful LBT as a first channel, where the first channel includes at least one channel;
and monitoring a wireless link on each channel of the first channels.
19. A network device, comprising:
a transceiver module, configured to send the first indication message to a terminal device, where the first indication message includes a configuration parameter of a reference signal, and the reference signal is used for radio link monitoring;
the transceiver module is further configured to send the second indication message to the terminal device, where the second indication message includes a channel identifier of the successful LBT of the network device and a channel occupation time COT of the reference signal;
the transceiver module is further configured to transmit the reference signal on each channel where LBT succeeds based on the configuration parameter of the reference signal.
20. The network device of claim 19, wherein the configuration parameters include a start transmission time, a transmission period, and a transmission channel;
the transceiver module is specifically configured to:
and transmitting the reference signal on the same channel of each channel with successful LBT and each channel of the transmission channel based on the transmission starting time and the transmission period of the reference signal and the COT of the reference signal.
21. The network device of claim 19 or 20, wherein the configuration parameters comprise a transmission time window for radio link monitoring in conjunction with the reference signal.
22. The network device of any one of claims 19-21, wherein the network device further comprises:
a processing module, configured to generate a third indication message, where the third indication message includes a random access parameter corresponding to the reference signal, and the random access parameter is used for radio link reconstruction;
the transceiver module is further configured to send the third indication message to the terminal device.
23. A terminal device comprising a processor, a transceiver and a memory, wherein the memory is configured to store a computer program comprising program instructions that, when executed by the processor, cause the reflecting device to perform the method according to any one of claims 1-7.
24. A network device comprising a processor, a transceiver and a memory, wherein the memory is configured to store a computer program comprising program instructions that, when executed by the processor, cause the reflecting device to perform the method of any one of claims 8-11.
25. A computer-readable storage medium having computer program instructions stored therein, which when run on the computer, cause the computer to perform the method of any one of claims 1-7.
26. A computer-readable storage medium having stored therein computer program instructions which, when run on the computer, cause the computer to perform the method of any one of claims 8-11.
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