CN110166084B - Downlink LBT method, device, medium and base station - Google Patents

Downlink LBT method, device, medium and base station Download PDF

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Publication number
CN110166084B
CN110166084B CN201810150680.3A CN201810150680A CN110166084B CN 110166084 B CN110166084 B CN 110166084B CN 201810150680 A CN201810150680 A CN 201810150680A CN 110166084 B CN110166084 B CN 110166084B
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monitored
downlink
data transmission
beams
monitoring
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CN110166084A (en
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王化磊
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Spreadtrum Communications Shanghai Co Ltd
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Spreadtrum Communications Shanghai Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0408—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more beams, i.e. beam diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0868—Hybrid systems, i.e. switching and combining
    • H04B7/088—Hybrid systems, i.e. switching and combining using beam selection

Abstract

The embodiment of the invention discloses a method, a device, a medium and a base station for downlink LBT, wherein the method comprises the following steps: determining a beam direction to be monitored of one or more beams to be monitored, wherein the beam to be monitored is selected from beams in an unlicensed spectrum range; and monitoring the one or more beams to be monitored to determine beams suitable for data transmission. The technical scheme of the invention can carry out downlink LBT under the NR scene.

Description

Downlink LBT method, device, medium and base station
Technical Field
The present invention relates to the field of communications, and in particular, to a method, an apparatus, a medium, and a base station for downlink LBT.
Background
The 3rd Generation Partnership Project (3 GPP) is currently introducing New Radio access technology (NR), including at least fifth Generation mobile communication technology (5G).
In the wireless technology, in order to improve the quality of communication service, communication may be performed using an unlicensed spectrum, that is, a Licensed Assisted Access (LAA) technology. Listen Before Talk (LBT) technology is an important part of unlicensed spectrum communication technology. So far, LAAs based on LTE protocols have had many new features over the original LAAs.
With the evolution of communication technologies, NR-based unlicensed spectrum communication technologies become a new technological hotspot. Based on the new properties of NR, LBT techniques need to be adapted accordingly. However, there is currently no LBT technique in the NR scenario.
Disclosure of Invention
The technical problem solved by the embodiment of the invention is how to carry out downlink LBT in an NR scene.
To solve the foregoing technical problem, an embodiment of the present invention provides a method for downlink LBT, including: determining a beam direction to be monitored of one or more beams to be monitored, wherein the beam to be monitored is selected from beams in an unlicensed spectrum range; and monitoring the one or more beams to be monitored to determine beams suitable for data transmission.
Optionally, the determining a beam direction to be listened for one or more beams to be listened includes: and determining the direction of the downlink wave beam which carries out downlink transmission at the last time as the direction of the wave beam to be monitored.
Optionally, the determining the beam direction of one or more beams to be listened to includes: and determining to send any type of downlink beam of CSI-RS, SSB, PDCCH, PDSCH and DRS in the downlink beam which is transmitted at the latest time, and taking the direction of the downlink beam as the direction of the beam to be monitored.
Optionally, the determining the beam direction of one or more beams to be listened to includes: and determining an uplink beam which receives uplink transmission at the last time, and taking the direction of a downlink beam corresponding to the uplink beam or the direction of the uplink beam as the direction of the beam to be monitored.
Optionally, the determining the beam direction of one or more beams to be listened to includes: and in an uplink beam which receives uplink transmission last time, determining to receive any type of uplink beam of SRS, PUSCH and PUCCH, and taking the direction of a downlink beam corresponding to the uplink beam or the direction of the uplink beam as the direction of the beam to be monitored.
Optionally, the listening for the one or more beams to be listened includes: and monitoring a beam to be monitored at the same time.
Optionally, the monitoring a beam to be monitored at the same time includes: after determining that one beam to be monitored is not suitable for data transmission, finishing monitoring the beam to be monitored; and after the monitoring of the beam to be monitored is finished, starting to monitor another beam to be monitored.
Optionally, determining that one beam to be listened to is not suitable for data transmission includes: and in a preset time length, the beam to be monitored does not meet the condition suitable for data transmission.
Optionally, the listening for the one or more beams to be listened includes: determining the window duration of a time window; monitoring any beam to be monitored in the window duration; after the monitoring of any beam to be monitored is finished, or before the monitoring of any beam to be monitored is finished, starting monitoring another beam to be monitored in the window time length, wherein the monitoring is finished, and the condition that the beam to be monitored does not meet the condition suitable for data transmission in the window time length is included.
Optionally, the listening for the one or more beams to be listened includes: and monitoring a plurality of beams to be monitored at the same time.
Optionally, monitoring a plurality of beams to be monitored at the same time includes: and simultaneously starting to monitor all the beams to be monitored until the beams suitable for data transmission are found in all the beams to be monitored, or confirming that all the beams to be monitored are not suitable for data transmission.
Optionally, the suitability for data transmission is determined by: all timeslots are measured to be free for one delay period and all timeslots are measured to be free for an integer number of additional delay periods.
Optionally, the number of the additional delay durations is determined according to priorities of different beams to be monitored, and the higher the priority of the beams to be monitored is, the smaller the number of the additional delay durations to be measured is.
Optionally, the priority of the different beams to be listened to is determined according to the priority of the terminal transmitting on the LAA.
Optionally, the monitoring multiple beams to be monitored at the same time includes: monitoring each beam to be monitored in the delay time; setting Ni＝NinitIn which N isiCorresponding to each beam direction to be monitored, i belongs to m, m is the number of beams to be monitored, NinitIs the interval [0, CW]The CW is configured according to the priority transmitted by the terminal on the LAA; for each beam direction to be monitored, if any N isiA value of 0, and the NiIf all time slots corresponding to the beams to be monitored are idle in the delay time length, the N is confirmediThe corresponding beam to be monitored is suitable for data transmission; for each beam direction to be monitored, if N isi> 0, and grant NiWhen the value is changed, N is obtainedi＝Ni-1; repeating the pair N when the monitoring result is idle in the time slot of the additional delay duration in the beam monitoring directioniAnd (5) judging the value.
Optionally, the downlink LBT method further includes: and utilizing the beam suitable for data transmission to assist data transmission.
Optionally, the downlink LBT method further includes: and informing the terminal of the beam direction suitable for downlink data transmission.
Optionally, the terminal is notified of the beam direction suitable for downlink data transmission through the authorized primary cell.
Optionally, the terminal is notified of the beam direction suitable for downlink data transmission through at least one of a PDCCH, a MAC-CE, and an RRC in the authorized primary cell.
Optionally, the terminal is notified of the beam direction suitable for downlink data transmission through an unauthorized LAA.
Optionally, the terminal is notified of the beam direction suitable for downlink data transmission through at least one of a PDCCH, a MAC-CE, and an RRC carried by the unlicensed LAA.
Optionally, the informing, by the PDCCH, the terminal of the beam direction suitable for downlink data transmission includes: and informing the terminal of the beam direction suitable for downlink data transmission through the TCI state in the DCI.
Optionally, the informing the terminal of the beam direction suitable for downlink data transmission includes: and receiving the receiving capability reported by the terminal, and determining and informing the terminal of the number of the beam directions suitable for downlink data transmission according to the receiving capability.
An embodiment of the present invention further provides a downlink LBT apparatus, including: a beam direction determining unit, adapted to determine a beam direction to be monitored of one or more beams to be monitored, the beam to be monitored being selected from beams within an unlicensed spectrum range; and the monitoring unit is suitable for monitoring the one or more beams to be monitored so as to determine the beams suitable for data transmission.
Optionally, the beam direction determining unit is adapted to determine a direction of a downlink beam that has performed downlink transmission last time as the beam direction to be monitored.
Optionally, the beam direction determining unit is adapted to determine, in a downlink beam that has been downlink transmitted last time, to send any one type of downlink beam among CSI-RS, SSB, PDCCH, PDSCH, and DRS, and use a direction of the downlink beam as the beam direction to be monitored.
Optionally, the beam direction determining unit is adapted to determine an uplink beam that has received uplink transmission last time, and use a direction of a downlink beam corresponding to the uplink beam or a direction of the uplink beam as the beam direction to be monitored.
Optionally, the beam direction determining unit is adapted to determine, in an uplink beam that has received uplink transmission last time, that an uplink beam of any type of SRS, PUSCH, and PUCCH is received, and use a direction of a downlink beam corresponding to the uplink beam or a direction of the uplink beam as the beam direction to be monitored.
Optionally, the listening unit is adapted to listen to one beam to be listened to at the same time.
Optionally, the monitoring unit is adapted to, after determining that one beam to be monitored is not suitable for data transmission, end monitoring of the beam to be monitored, and after ending monitoring of the beam to be monitored, start monitoring another beam to be monitored.
Optionally, determining that one beam to be listened to is not suitable for data transmission includes: and in a preset time length, the beam to be monitored does not meet the condition suitable for data transmission.
Optionally, the listening unit includes: a window duration determining subunit adapted to determine a window duration of the time window; the window monitoring subunit is suitable for monitoring any beam to be monitored in the window duration; and the window monitoring new subunit is suitable for starting monitoring of another beam to be monitored in the window time length after the monitoring of any beam to be monitored is finished or before the monitoring of any beam to be monitored is finished, wherein the monitoring is finished and the beam to be monitored does not meet the condition suitable for data transmission in the window time length.
Optionally, the listening unit is adapted to listen to a plurality of beams to be listened to at the same time.
Optionally, the listening unit is adapted to start listening to all beams to be listened to simultaneously until a beam suitable for data transmission is found in all beams to be listened to, or it is confirmed that all beams to be listened to are not suitable for data transmission.
Optionally, the suitability for data transmission is determined by: all timeslots are measured to be free for one delay period and all timeslots are measured to be free for an integer number of additional delay periods.
Optionally, the number of the additional delay durations is determined according to priorities of different beams to be monitored, and the higher the priority of the beams to be monitored is, the smaller the number of the additional delay durations to be measured is.
Optionally, the priority of the different beams to be listened to is determined according to the priority of the terminal transmitting on the LAA.
Optionally, the listening unit includes: the delay time monitoring subunit is suitable for monitoring each beam to be monitored in the delay time; a variable setting subunit adapted to set Ni＝NinitIn which N isiCorresponding to each beam direction to be monitored, i belongs to m, m is the number of beams to be monitored, NinitIs the interval [0, CW]The CW is configured according to the priority transmitted by the terminal on the LAA; a confirmation subunit, for each beam direction to be monitored, if any NiA value of 0, and the NiIf all time slots corresponding to the beams to be monitored are idle in the delay time length, the N is confirmediThe corresponding beam to be monitored is suitable for data transmission; the variable value changes the sub-unit, for each beam direction to be monitored, if Ni> 0, and grant NiWhen the value is changed, N is obtainedi＝Ni-1; a repeating subunit adapted to repeat the pair N when the monitoring result is idle in the time slot of the additional delay duration in the monitoring beam directioniAnd (5) judging the value.
Optionally, the apparatus of downlink LBT further includes: and the data transmission unit is suitable for carrying out data transmission by utilizing the beam which is suitable for carrying out data transmission to assist.
Optionally, the apparatus of downlink LBT further includes: and the notification unit is suitable for notifying the terminal of the beam direction suitable for downlink data transmission.
Optionally, the notifying unit is adapted to notify the terminal of the beam direction suitable for downlink data transmission through the authorized primary cell
Optionally, the notifying unit is adapted to notify the terminal of the beam direction suitable for downlink data transmission through at least one of PDCCH, MAC-CE and RRC in the authorized primary cell.
Optionally, the notifying unit is adapted to notify the terminal of the beam direction suitable for downlink data transmission through an unlicensed LAA.
Optionally, the notifying unit is adapted to notify the terminal of the beam direction suitable for downlink data transmission through at least one of a PDCCH, a MAC-CE, and an RRC carried by the unlicensed LAA.
Optionally, the notifying unit notifies the terminal of the beam direction suitable for downlink data transmission through the PDCCH includes: and informing the terminal of the beam direction suitable for downlink data transmission through the TCI state in the DCI.
Optionally, the notifying unit is adapted to receive a receiving capability reported by the terminal, and determine and notify the terminal of the number of beam directions suitable for downlink data transmission according to the receiving capability.
An embodiment of the present invention further provides a computer-readable storage medium, on which computer instructions are stored, and when the computer instructions are executed, the computer instructions perform any of the steps of the downlink LBT method described above.
The embodiment of the present invention further provides a system including a memory and a processor, where the memory stores computer instructions capable of being executed on the processor, and the processor executes the computer instructions to perform any of the steps of the downlink LBT method described above.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
in the NR scenario, data transmission may be based on multiple beams, with different beam directions for different beams. In the embodiment of the present invention, the beam direction of one or more beams to be monitored, that is, the beam direction to be monitored, is determined, so that a beam to be monitored that needs to be monitored can be determined, one or more beams to be monitored are monitored, so as to determine a beam suitable for data transmission, and then downlink LBT in an NR scenario can be completed.
Drawings
Fig. 1 is a flowchart of a method for downlink LBT according to an embodiment of the present invention;
fig. 2 is a flowchart of a specific implementation of monitoring a beam to be monitored by a base station side in an embodiment of the present invention;
FIG. 3 is a diagram illustrating a time domain distribution of a time window in an embodiment of the present invention;
fig. 4 is a flowchart of another specific implementation of the base station side monitoring a beam to be monitored in the embodiment of the present invention;
fig. 5 is a schematic structural diagram of an apparatus for downlink LBT according to an embodiment of the present invention;
fig. 6 is a schematic diagram of time distribution for listening to beams to be listened to in the embodiment of the present invention.
Detailed Description
As described above, the NR-based unlicensed spectrum communication technology has become a new technology hotspot. Based on the new properties of NR, LBT techniques need to be adapted accordingly. However, there is currently no downlink LBT technique based on beam direction in NR scenarios.
In the NR scenario, data transmission may be performed based on a plurality of beams, which may be distinguished by the type and sequence number of the RS carrying the beam. The beam directions of the different beams are different. The beam direction in the embodiment of the present invention may be distinguished by spatial configuration (spatial configuration) of resources carrying any one or more of a channel state information Reference Signal (CSI-RS), a channel Sounding Signal (SRS), a Tracking Reference Signal (TRS), a synchronization Signal and broadcast channel block (SS/PBCH block, SSB), and a Discovery Reference Signal (DRS).
For example, the PDCCH, PDSCH, PRACH, PUCCH, or PUSCH may be associated with any one or more of the above-mentioned reference signals, and indicate that they have the same spatial configuration (spatial configuration), so that the transmission or reception beam direction thereof may be determined. In addition, the spatial configuration (spatial configuration) of any one of the resources in the reference signal may be associated with the spatial configuration (spatial configuration) of another one of the resources in the reference signal, indicating that they have the same spatial configuration (spatial configuration), and may determine the transmission or reception beam direction. The following directions related to transmission or reception of channels PDCCH, PDSCH, PRACH, PUCCH, PUSCH, uplink transmission, downlink transmission and various reference signals may be determined by their associated CSI-RS resources (or CSI-RS resource set or CSI-RS), TRS resources (or TRS resource set or TRS), SSBs, SRS resources (or SRS resource set or SRS) or DRSs (or DRS resource set).
In the embodiment of the present invention, the beam direction of one or more beams to be monitored, that is, the beam direction to be monitored, is determined, so that a beam to be monitored that needs to be monitored can be determined, one or more beams to be monitored are monitored, so as to determine a beam suitable for data transmission, and then downlink LBT in an NR scenario can be completed.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 1 is a flowchart of a method for downlink LBT in an embodiment of the present invention, which specifically includes the following steps:
step S11, determining the beam direction to be monitored of one or more beams to be monitored, wherein the beams to be monitored are selected from beams in an unlicensed spectrum range;
and step S12, listening to the one or more beams to be listened to determine a beam suitable for data transmission.
The beam to be monitored is a downlink beam, the direction of the beam to be monitored is the direction of the beam to be monitored, and is referred to as the direction of the beam to be monitored for convenience of description. In specific implementation, the determination manner of the beam direction to be monitored may be various, and is described below separately.
In a specific implementation, the base station side may determine that the direction of the downlink beam that has performed downlink transmission last time is the beam direction to be monitored. The number of downlink beams for downlink transmission at the last time may be one or more.
Further, the base station side may determine to send any one type of downlink beam of CSI-RS, SSB, PDCCH, PDSCH, and DRS in the downlink beam that has been downlink transmitted last time, and use the direction of the downlink beam as the direction of the beam to be monitored. The sending of the CSI-RS type downlink wave beam may include sending any one of a CSI-RS, a CSI-RS resource and a CSI-RS resource set; transmitting the downlink beam of the DRS type may include transmitting a downlink beam of any one of a DRS, a DRS resource, and a DRS resource set.
In another specific implementation, the base station side may determine an uplink beam that has received uplink transmission last time, and use a direction of a downlink beam or a direction of an uplink beam corresponding to the uplink beam as the beam direction to be monitored. The number of uplink beams that have received uplink transmission last time may be one or more.
Further, the base station side may determine that any type of uplink beam among SRS, PUSCH, and PUCCH is received, and take a direction of a downlink beam or a direction of an uplink beam corresponding to the uplink beam as the beam direction to be monitored. The uplink beam receiving the SRS type may be an uplink beam receiving any one of the SRS, the SRS resource, and the SRS resource set.
It will be appreciated by those skilled in the art that in LTE-LAA, where DRS are present for purposes of UE synchronization, channel measurement, etc., the DRS includes PSS, SSS and CRS, and optionally CSI-RS.
And in NR-LAA, the DRS may be any combination of: PSS and SSS; PSS, SSS and PBCH; PSS, SSS, and TRS; PSS, SSS, PBCH, and TRS; PSS, SSS and CSI-RS; PSS, SSS, PBCH and CSI-RS. Alternatively, DRS may be other combinations.
In addition, various signals, channels and other technical terms mentioned in the embodiments of the present invention may be the same as or similar to those in LTE, or may also be different from LTE, but may implement similar functions.
The above describes how the base station side obtains the possible directions of the beams to be monitored and the obtaining manner, which may be used singly or in combination according to the needs.
In a specific implementation, when the base station side monitors one or more beams to be monitored, one beam to be monitored may be monitored at the same time, or multiple beam directions may also be monitored at the same time, which will be described in more detail below.
In one specific implementation, the base station side monitors a beam to be monitored at the same time. Specifically, the base station side may end monitoring the beam to be monitored after determining that one beam to be monitored is not suitable for data transmission; and after the monitoring of the beam to be monitored is finished, starting to monitor another beam to be monitored.
Determining that one beam to be monitored is not suitable for data transmission may include: and in a preset time length, the beam to be monitored does not meet the condition suitable for data transmission. This implementation may be applied when the base station side has limited listening capabilities, e.g. when the base station side can listen to beams in only one direction at the same time, or it may be chosen depending on the configuration of the base station side.
In another specific implementation, referring to fig. 2, the monitoring, by the base station side, the one or more beams to be monitored may include the following steps:
step S21, determining the window duration of the time window;
step S22, monitoring any beam to be monitored in the window duration;
step S23, after the end of monitoring any beam to be monitored, or before the end of monitoring any beam to be monitored, start monitoring another beam to be monitored within the window duration.
When the monitoring of any beam to be monitored is finished, the beam to be monitored does not meet the condition suitable for data transmission in the window duration.
In a specific implementation, a fixed time duration may be set, and after the monitoring on the previous beam to be monitored is started, the monitoring is started, and after the fixed time duration is waited, if none of the previous beams to be monitored meets the condition suitable for data transmission, the monitoring on a new beam to be monitored in the window time duration is started.
For further explanation in conjunction with fig. 2 and 3, fig. 3 shows 3 time windows, time window W1, time window W2, and time window W3. And monitoring different beams to be monitored in each time window. At time T1, the base station side listens to one beam to be monitored, and at time T2, the base station side listens to two beams to be monitored simultaneously. By setting the length of the time window and the initial position for monitoring the next beam to be monitored, the number of beams monitored by the base station side at the same time can be controlled, and the efficiency of the downlink LBT method can be improved.
In fig. 3, after a beam to be monitored starts to be monitored in the time window W1, a fixed time period t is waited for3Then, if the beam monitored in the time window W1 does not satisfy the condition for data transmission, (or the duration of the time window W1 is over), monitoring another beam to be monitored in the time window W2 is started. After listening to a beam to be listened to in the time window W2 is started, if the duration of the time window W1 has ended (or the beam listening in the time window W1 has not yet satisfied the condition suitable for data transmission), and the beam listening in the time window W2 has not satisfied the condition suitable for data transmission (or the duration of the time window W2 has ended), then listening to another beam to be listened to in the time window W3 is started.
In a specific implementation, the window duration may not be set for each beam to be monitored, and the total window duration may be set for all beams, for example, referring to fig. 6, after monitoring the beam to be monitored B1, the beam to be monitored B1 may wait for a fixed timeLength t3If the beam B1 to be monitored does not satisfy the condition suitable for data transmission, then starting monitoring the beam B2 to be monitored; waiting for a fixed time duration t again after listening to the beam B2 to be listened3If the condition for data transmission is not satisfied by the beam to be listened to B1 and the condition for data transmission is not satisfied by the beam to be listened to B2, then the listening to the beam to be listened to B3 is started.
The process of listening to each beam may be stopped at finding a beam suitable for data transmission among all beams to be listened to, or confirming that all beams to be listened to are not suitable for data transmission. For example, the window duration t can be set4And in the time length, if no beam suitable for data transmission is found, stopping monitoring all beams to be monitored.
In other specific implementations, the base station side may also monitor multiple beams to be monitored at the same time.
Specifically, the monitoring of the multiple beams to be monitored at the same time may be started simultaneously until a beam suitable for data transmission is found in all the beams to be monitored; or may stop according to the configuration, for example, when all the beams to be listened to are determined to be not suitable for data transmission within a predetermined time.
Further, the suitability for data transmission may be determined by: all timeslots are measured to be free for one delay period and all timeslots are measured to be free for an integer number of additional delay periods. The number of the additional delay durations can be determined according to the priorities of different beams to be monitored, and the higher the priority of the beams to be monitored, the smaller the number of the additional delay durations to be measured.
Further, the priority of the beams to be listened to may be determined according to the priority of the terminal transmitting on the LAA.
Fig. 4 is a partial flowchart of another specific implementation of the base station side monitoring a beam to be monitored in the embodiment of the present invention, where Step1 to Step6 may be included.
Step1, setting Ni＝NinitIn which N isiCorresponding to each beam direction to be listened to.
Wherein i belongs to m, m is the number of beams to be monitored, NinitIs the interval [0, CW]The CW is configured according to the priority of the terminal transmission on the LAA.
Step4, determine whether there is any NiIf there is any N, the value of (A) is 0iIf it is 0, it is ended, otherwise, Step2 is executed.
Step2, for each beam direction to be monitored, if N isi> 0, and grant NiWhen the value varies, N is madei＝Ni-1。
And Step3, judging whether the monitoring result in the time slot with the additional delay time length is idle, if so, executing Step4, otherwise, executing Step 5.
And judging whether the monitoring result in the time slot with the additional delay time length is idle or not, wherein the judgment is carried out on all the time slots of each beam to be monitored in the additional delay time length.
Step4, if any N is presentiAt a value of 0, stop, otherwise Step2 is executed.
Step5 listens until a busy slot is detected for an additional delay period, or all slots are free for an additional delay period.
Here, the listening in Step5 is continued for each beam to be listened whose listening result in Step3 is not idle.
Step6, if all slots are free within an additional delay period, then Step4 is executed, otherwise Step5 is executed.
In the specific implementation, if the monitoring result for any beam to be monitored in the delay duration is idle, and in Step4, its corresponding N isiThe value is 0 first, it can be determined that the beam to be listened to is suitable for data transmission. Listening to the other beams to be listened to may be stopped at this point.
The time domain length of the delay duration (defer duration) and the additional delay duration (additional delay duration), the relationship between the delay duration and the additional delay duration, and how to determine that one beam to be monitored is idle in the two beams, may refer to the configuration of the beam in LTE. It should be noted that specific parameter values of parameters appearing in the configuration in LTE are merely exemplary descriptions, and the present invention is not limited thereto, and in the case of satisfying the above similar rules, values of related parameters are other parameter values, which also belongs to the protection scope of the present invention.
The method for determining whether each beam to be monitored performs data transmission in the embodiment of the present invention may also be applied to the foregoing scenario in which a beam to be monitored is monitored at the same time, and may also be applied to the foregoing scenario in which a beam to be monitored is monitored by setting a time window.
In a specific implementation, after determining a beam to be monitored suitable for data transmission, the base station side may perform downlink data transmission using the beam.
With continued reference to fig. 1, the method for downlink LBT in the embodiment of the present invention may further include: step S13, the terminal is informed of the beam direction suitable for downlink data transmission. That is, the terminal is informed of the beam direction in which the base station side may perform downlink data transmission, and the beam direction may be selected from the beam directions to be monitored.
Specifically, the base station side may receive the receiving capability reported by the terminal, and determine and inform the terminal of the number of beam directions suitable for downlink data transmission according to the receiving capability. For example, the base station side may have 5 beam directions for downlink data transmission, but the terminal can only receive 2 of the beam directions, and then the terminal may be informed of only the 2 beam directions suitable for downlink data transmission, so that the terminal can receive downlink data in the 2 beam directions.
The terminal may indicate its receiving capability, that is, the maximum number of supported receiving beams, by reporting, to the base station, the maximum number of supported SRS resources (or SRS resource sets or SRSs), or the maximum number of supported CSI-RS resources (or CSI-RS resource sets or CSI-RSs), or the maximum number of supported TRS resources (or TRS resource sets or TRSs), or the maximum number of supported SSBs, or the maximum number of supported DRS (or DRS resources or DRS resource sets).
In a specific implementation, a beam direction suitable for downlink data transmission may be indicated by the authorized primary cell. Further, the indication may be performed by authorizing at least one of a Physical Downlink Control Channel (PDCCH), a Media Access Control-Control Element (MAC-CE), and a Radio Resource Control (RRC) in the primary cell.
Further, when a beam direction suitable for Downlink data Transmission is indicated by using the PDCCH, a region may be set in Downlink Control Information (DCI) to indicate a Transmission Configuration Indication (TCI) state to indicate a beam direction in which Downlink data Transmission is possible on the base station side.
Wherein, one or more TCI states may be included in the DCI. Each TCI state may contain one or more CSI-RS resources (or sets of CSI-RS resources or CSI-RSs), TRS resources (or sets of TRS resources or TRSs), SSBs, SRS resources (or sets of SRS resources or SRSs), or DRSs (or sets of DRS resources or DRS resources). When the DCI may include a plurality of TCI states, the base station may indicate a plurality of possible downlink data transmission beam directions to the terminal. Or when the DCI includes one TCI state, but the TCI contains multiple CSI-RS resources (or CSI-RS resource sets or CSI-RSs), TRS resources (or TRS resource sets or TRSs), SSBs, SRS resources (or SRS resource sets or SRSs), or DRSs (or DRS resources or DRS resource sets), the base station side may indicate multiple beam directions to the terminal.
As described above, if the base station side receives the receiving capability reported by the terminal, the number of beam directions suitable for downlink data transmission can be determined and notified to the terminal according to the receiving capability. For example, the number of TCI states included in the DCI may match the reception capability reported by the terminal.
In another specific implementation, the base station side may indicate, to the terminal, a beam direction in which the base station side may perform downlink data transmission through an unlicensed LAA carrier. Specifically, the base station side may inform the terminal of a beam direction in which the base station side may perform downlink data transmission through at least one of a PDCCH, a MAC-CE, and an RRC carried by the unlicensed LAA. The indication of the beam direction may be implemented by indicating one or more CSI-RS resources (or CSI-RS resource sets or CSI-RSs), TRS resources (or TRS resource sets or TRSs), SSBs, SRS resources (or SRS resource sets or SRSs), or DRSs (or DRS resources or DRS resource sets).
Similar to informing the terminal base station side of the beam direction in which downlink data transmission is possible through the authorized primary cell, when the PDCCH is used to indicate the beam direction information, a region may be set in the DCI to indicate the TCI state, thereby informing the terminal base station side of the beam direction in which downlink data transmission is possible. Each TCI state may contain one or more CSI-RS resources (or sets of CSI-RS resources or CSI-RSs), TRS resources (or sets of TRS resources or TRSs), SSBs, SRS resources (or sets of SRS resources or SRSs), or DRSs (or sets of DRS resources or DRS resources). When the DCI may include a plurality of TCI states, the base station may indicate a plurality of possible downlink data transmission beam directions to the terminal. Or when the DCI includes one TCI state, but the TCI contains multiple CSI-RS resources (or CSI-RS resource sets or CSI-RSs), TRS resources (or TRS resource sets or TRSs), SSBs, SRS resources (or SRS resource sets or SRSs), or DRSs (or DRS resources or DRS resource sets), the base station side may indicate multiple beam directions to the terminal.
In a specific implementation, the PDCCH may be a PDCCH that is transmitted last time by the UE on an unlicensed LAA bearer or a cell. Similarly, the MAC-CE may be the MAC-CE that was last transmitted by the corresponding UE on the unlicensed LAA bearer or on the cell.
In NR systems, the types of unlicensed spectrum supported are generally divided into two categories: one is an independent LAA (standalon LAA) and the other is a non-independent LAA (non-standalon LAA). Wherein, the latter clock is configured with a licensed primary cell (licensed pcell), which can assist in the transmission of some channels or reference signals or configuration information. The downlink LBT method in the embodiment of the present invention is applicable to both of the above two scenarios.
An embodiment of the present invention further provides a downlink LBT device, which is applicable to a base station side, and a schematic structural diagram of the downlink LBT device is shown in fig. 5, where the downlink LBT device specifically includes:
a beam direction determining unit 51 adapted to determine a beam direction to be listened for one or more beams to be listened for, the beams to be listened for being selected from beams in an unlicensed spectrum range;
a listening unit 52 adapted to listen to the one or more beams to be listened to determine a beam suitable for data transmission.
In a specific implementation, the beam direction determining unit 51 is adapted to determine a direction of a downlink beam that has performed downlink transmission last time as the beam direction to be monitored.
In a specific implementation, the beam direction determining unit 51 is adapted to determine, in a downlink beam that has been downlink transmitted last time, to send any one type of downlink beam among CSI-RS, SSB, PDCCH, PDSCH, and DRS, and use a direction of the downlink beam as the beam direction to be monitored. The sending of the CSI-RS type downlink wave beam may include sending any one of a CSI-RS, a CSI-RS resource and a CSI-RS resource set; transmitting the downlink beam of the DRS type may include transmitting a downlink beam of any one of a DRS, a DRS resource, and a DRS resource set.
In a specific implementation, the beam direction determining unit 51 is adapted to determine an uplink beam that has received uplink transmission last time, and use a direction of a downlink beam or a direction of an uplink beam corresponding to the uplink beam as the beam direction to be monitored.
In a specific implementation, the beam direction determining unit 51 is adapted to determine that any type of uplink beam among SRS, PUSCH, and PUCCH is received in an uplink beam that has received an uplink transmission last time, and take a direction of the downlink beam or a direction of the uplink beam corresponding to the uplink beam as the beam direction to be monitored. The uplink beam receiving the SRS type may be an uplink beam receiving any one of the SRS, the SRS resource, and the SRS resource set.
In a specific implementation, the listening unit 52 is adapted to listen to a beam to be listened to at the same time.
In a specific implementation, the monitoring unit 52 is adapted to, after determining that one beam to be monitored is not suitable for data transmission, end monitoring on the beam to be monitored, and after ending monitoring on the beam to be monitored, start monitoring on another beam to be monitored.
In a specific implementation, determining that one beam to be monitored is not suitable for data transmission includes: and in a preset time length, the beam to be monitored does not meet the condition suitable for data transmission. Wherein the preset duration may be predefined. In addition, the preset duration may also be a Timer (Timer), and the preset duration is stopped when the Timer expires (Timer expires) to confirm that all the beams to be monitored are not suitable for data transmission.
Before the monitoring of any beam to be monitored is finished, the beam to be monitored does not meet the condition suitable for data transmission yet in the process of monitoring the beam to be monitored, and the monitoring time is less than the window duration. Therefore, when any one or more beams to be monitored are monitored, the condition for starting monitoring another beam to be monitored in the window duration is that none of the beams to be monitored which are monitoring meets the condition suitable for data transmission.
In a specific implementation, the listening unit 52 may include: a window duration determining subunit adapted to determine a window duration of the time window; the window monitoring subunit is suitable for monitoring any beam to be monitored in the window duration; and the window monitoring new subunit is suitable for starting monitoring of another beam to be monitored in the window time length after the monitoring of any beam to be monitored is finished or before the monitoring of any beam to be monitored is finished, wherein the monitoring is finished and the beam to be monitored does not meet the condition suitable for data transmission in the window time length.
In a specific implementation, the listening unit 52 is adapted to listen to a plurality of beams to be listened to at the same time.
In a specific implementation, the listening unit 52 is adapted to start listening to all beams to be listened to simultaneously until a beam suitable for data transmission is found in all beams to be listened to, or it is determined that all beams to be listened to are not suitable for data transmission.
In a specific implementation, the suitability for data transmission is determined by: all timeslots are measured to be free for one delay period and all timeslots are measured to be free for an integer number of additional delay periods.
In a specific implementation, the number of the additional delay durations may be determined according to priorities of different beams to be monitored, and the higher the priority of the beams to be monitored, the smaller the number of the additional delay durations to be measured.
In a specific implementation, the priorities of the different beams to be monitored may be determined according to the priorities of the transmissions on the LAA by the terminal.
In a specific implementation, the listening unit 52 may include: the delay time monitoring subunit is suitable for monitoring each beam to be monitored in the delay time; the variable setting subunit is suitable for setting Ni as Ninit, wherein Ni corresponds to each beam direction to be monitored, i belongs to m, m is the number of beams to be monitored, Ninit is a uniformly distributed random number in an interval [0, CW ], and CW is configured according to the priority transmitted by the terminal on the LAA; a confirming subunit, configured to, for each beam direction to be monitored, if any Ni value is 0 and all time slots of the beam to be monitored corresponding to Ni are idle in the delay duration, confirm that the beam to be monitored corresponding to Ni is suitable for data transmission; a variable value changing subunit that, for each beam direction to be monitored, if Ni > 0 and a variation in Ni value is permitted, makes Ni equal to Ni-1; and the repeating subunit is suitable for repeating the judgment of the Ni value when the monitoring result is idle in the time slot with the additional delay duration in the beam monitoring direction.
In a specific implementation, the apparatus for downlink LBT may further include: and the data transmission unit is suitable for carrying out data transmission by utilizing the beam which is suitable for carrying out data transmission to assist.
In a specific implementation, the apparatus for downlink LBT may further include: and the notification unit is suitable for notifying the terminal of the beam direction suitable for downlink data transmission. The indication of the beam direction may be implemented by indicating one or more CSI-RS resources (or CSI-RS resource sets or CSI-RSs), TRS resources (or TRS resource sets or TRSs), SSBs, SRS resources (or SRS resource sets or SRSs), or DRSs (or DRS resources or DRS resource sets).
In a specific implementation, the notifying unit is adapted to notify the terminal of the beam direction suitable for downlink data transmission through an authorized primary cell. The indication of the beam direction may be implemented by indicating one or more CSI-RS resources (or CSI-RS resource sets or CSI-RSs), TRS resources (or TRS resource sets or TRSs), SSBs, SRS resources (or SRS resource sets or SRSs), or DRSs (or DRS resources or DRS resource sets).
In a specific implementation, the notifying unit is adapted to notify the terminal of the beam direction suitable for downlink data transmission through at least one of PDCCH, MAC-CE and RRC in the authorized primary cell. The indication of the beam direction may be implemented by indicating one or more CSI-RS resources (or CSI-RS resource sets or CSI-RSs), TRS resources (or TRS resource sets or TRSs), SSBs, SRS resources (or SRS resource sets or SRSs), or DRSs (or DRS resources or DRS resource sets).
In a specific implementation, the notification unit is adapted to notify the terminal of the beam direction suitable for downlink data transmission through an unauthorized LAA. The indication of the beam direction may be implemented by indicating one or more CSI-RS resources (or CSI-RS resource sets or CSI-RSs), TRS resources (or TRS resource sets or TRSs), SSBs, SRS resources (or SRS resource sets or SRSs), or DRSs (or DRS resources or DRS resource sets).
In a specific implementation, the notifying unit is adapted to notify the terminal of the beam direction suitable for downlink data transmission through at least one of a PDCCH, a MAC-CE, and an RRC carried by an unlicensed LAA. The indication of the beam direction may be implemented by indicating one or more CSI-RS resources (or CSI-RS resource sets or CSI-RSs), TRS resources (or TRS resource sets or TRSs), SSBs, SRS resources (or SRS resource sets or SRSs), or DRSs (or DRS resources or DRS resource sets).
In a specific implementation, the notifying unit notifies, through the PDCCH, the terminal of the beam direction suitable for downlink data transmission, including: and informing the terminal of the beam direction suitable for downlink data transmission through the TCI state in the DCI. The indication of the beam direction may be implemented by indicating one or more CSI-RS resources (or CSI-RS resource sets or CSI-RSs), TRS resources (or TRS resource sets or TRSs), SSBs, SRS resources (or SRS resource sets or SRSs), or DRSs (or DRS resources or DRS resource sets).
In a specific implementation, the notification unit is adapted to receive a receiving capability reported by a terminal, and determine and notify the terminal of the number of beam directions suitable for downlink data transmission according to the receiving capability.
For specific implementation and beneficial effects of the apparatus for downlink LBT in the embodiment of the present invention, reference may be made to the method for downlink LBT in the embodiment of the present invention, which is not described herein again.
The embodiment of the present invention further provides a computer-readable storage medium, on which computer instructions are stored, and the computer instructions, when executed, perform the steps of the downlink LBT method. The computer readable storage medium may be an optical disc, a mechanical hard disk, a solid state hard disk, etc.
The embodiment of the present invention further provides a base station, which includes a memory and a processor, where the memory stores computer instructions capable of being executed on the processor, and the processor executes the steps of the downlink LBT method when executing the computer instructions.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (46)

1. A method for downlink LBT, comprising:
determining a beam direction to be monitored of one or more beams to be monitored, wherein the beam to be monitored is selected from beams in an unlicensed spectrum range;
monitoring the one or more beams to be monitored to determine beams suitable for data transmission; wherein monitoring the one or more beams to be monitored comprises:
determining the window duration of a time window;
monitoring any beam to be monitored in the window duration;
after the monitoring of any beam to be monitored is finished or before the monitoring of any beam to be monitored is finished, starting monitoring another beam to be monitored in the window time length, wherein the monitoring is finished and the beam to be monitored does not meet the condition suitable for data transmission in the window time length;
and controlling the number of the beams monitored at the same time by configuring the length of the time window and the initial position for monitoring the beam to be monitored later.
2. The method of downlink LBT as claimed in claim 1, wherein said determining the beam direction to be monitored of the one or more beams to be monitored comprises: and determining the direction of the downlink wave beam which carries out downlink transmission at the last time as the direction of the wave beam to be monitored.
3. The method of downlink LBT as claimed in claim 1, wherein said determining the beam direction of one or more beams to be listened to comprises: and determining to send any type of downlink beam of CSI-RS, SSB, PDCCH, PDSCH and DRS in the downlink beam which is transmitted at the latest time, and taking the direction of the downlink beam as the direction of the beam to be monitored.
4. The method of downlink LBT as claimed in claim 1, wherein said determining the beam direction of one or more beams to be listened to comprises: and determining an uplink beam which receives uplink transmission at the last time, and taking the direction of a downlink beam corresponding to the uplink beam or the direction of the uplink beam as the direction of the beam to be monitored.
5. The method of downlink LBT as claimed in claim 1, wherein said determining the beam direction of one or more beams to be listened to comprises: and in an uplink beam which receives uplink transmission last time, determining to receive any type of uplink beam of SRS, PUSCH and PUCCH, and taking the direction of a downlink beam corresponding to the uplink beam or the direction of the uplink beam as the direction of the beam to be monitored.
6. The method of downlink LBT as claimed in claim 1, wherein the monitoring the one or more beams to be monitored comprises: and monitoring a beam to be monitored at the same time.
7. The method of downlink LBT as claimed in claim 6, wherein said monitoring a beam to be monitored at the same time includes:
after determining that one beam to be monitored is not suitable for data transmission, finishing monitoring the beam to be monitored;
and after the monitoring of the beam to be monitored is finished, starting to monitor another beam to be monitored.
8. The method of downlink LBT as claimed in claim 7, wherein determining that one beam to be monitored is not suitable for data transmission comprises: and in a preset time length, the beam to be monitored does not meet the condition suitable for data transmission.
9. The method of downlink LBT as claimed in claim 1, wherein the monitoring the one or more beams to be monitored comprises: and monitoring a plurality of beams to be monitored at the same time.
10. The method of downlink LBT as claimed in claim 9, wherein the monitoring multiple beams to be monitored at the same time includes: and simultaneously starting to monitor all the beams to be monitored until the beams suitable for data transmission are found in all the beams to be monitored, or confirming that all the beams to be monitored are not suitable for data transmission.
11. The downlink LBT method as claimed in claim 10, wherein said data transmission suitability is determined by the following conditions: all timeslots are measured to be free for one delay period and all timeslots are measured to be free for an integer number of additional delay periods.
12. The downlink LBT method according to claim 11, wherein the number of the additional delay durations is determined according to priorities of different beams to be monitored, and the higher the priority of the beams to be monitored, the smaller the number of the additional delay durations to be measured.
13. The downlink LBT method according to claim 12, wherein the priority of different beams to be monitored is determined according to the priority of the terminal transmitting on LAA.
14. The method of downlink LBT as claimed in claim 9, wherein said monitoring multiple beams to be monitored at the same time includes:
monitoring each beam to be monitored in the delay time;
setting Ni＝NinitIn which N isiCorresponding to each beam direction to be monitored, i belongs to m, m is the number of beams to be monitored, NinitIs the interval [0, CW]The CW is configured according to the priority transmitted by the terminal on the LAA;
for each beam direction to be monitored, if any N isiA value of 0, and the NiCorresponding to the beam to be monitoredIf all time slots in the delay time length are idle, the N is confirmediThe corresponding beam to be monitored is suitable for data transmission;
for each beam direction to be monitored, if N isi> 0, and grant NiWhen the value is changed, N is obtainedi＝Ni-1；
Repeating the pair N when the monitoring result is idle in the time slot of the additional delay duration in the beam monitoring directioniAnd (5) judging the value.
15. The method of downlink LBT according to claim 1, further comprising: and utilizing the beam suitable for data transmission to assist data transmission.
16. The method of downlink LBT according to claim 1, further comprising: and informing the terminal of the beam direction suitable for downlink data transmission.
17. The method of downlink LBT as claimed in claim 16, wherein the terminal is informed of the beam direction suitable for downlink data transmission through the authorized primary cell.
18. The method of downlink LBT as claimed in claim 17, wherein the terminal is informed of the beam direction suitable for downlink data transmission through at least one of PDCCH, MAC-CE and RRC in the authorized primary cell.
19. The method of downlink LBT as claimed in claim 16, wherein the terminal is informed of the beam direction suitable for downlink data transmission through an unlicensed LAA.
20. The method of downlink LBT as claimed in claim 19, wherein the terminal is informed of the beam direction suitable for downlink data transmission through at least one of PDCCH, MAC-CE and RRC carried by unlicensed LAA.
21. The method of downlink LBT according to any one of claims 18 or 20, wherein informing the terminal of the beam direction suitable for downlink data transmission through the PDCCH comprises: and informing the terminal of the beam direction suitable for downlink data transmission through the TCI state in the DCI.
22. The method of downlink LBT as claimed in claim 16, wherein informing the terminal of the beam direction suitable for downlink data transmission comprises: and receiving the receiving capability reported by the terminal, and determining and informing the terminal of the number of the beam directions suitable for downlink data transmission according to the receiving capability.
23. An apparatus for downlink LBT, comprising:
a beam direction determining unit, adapted to determine a beam direction to be monitored of one or more beams to be monitored, the beam to be monitored being selected from beams within an unlicensed spectrum range;
the monitoring unit is suitable for monitoring the one or more beams to be monitored so as to determine the beams suitable for data transmission;
wherein the listening unit comprises:
a window duration determining subunit adapted to determine a window duration of the time window;
the window monitoring subunit is suitable for monitoring any beam to be monitored in the window duration;
the new window monitoring subunit is adapted to start monitoring another beam to be monitored in the window duration after the end of monitoring any beam to be monitored or before the end of monitoring any beam to be monitored, where the end of monitoring includes that the beam to be monitored does not satisfy a condition suitable for data transmission in the window duration;
and controlling the number of the beams monitored at the same time by configuring the length of the time window and the initial position for monitoring the beam to be monitored later.
24. The apparatus according to claim 23, wherein the beam direction determining unit is adapted to determine a direction of a downlink beam that has been transmitted last time as the beam direction to be monitored.
25. The apparatus according to claim 23, wherein the beam direction determining unit is adapted to determine, in a downlink beam for which downlink transmission has been performed last time, to transmit any one type of downlink beam among CSI-RS, SSB, PDCCH, PDSCH and DRS, and take a direction of the downlink beam as the beam direction to be monitored.
26. The apparatus according to claim 23, wherein the beam direction determining unit is adapted to determine an uplink beam that has received uplink transmission last time, and take a direction of the downlink beam corresponding to the uplink beam or a direction of the uplink beam as the beam direction to be monitored.
27. The apparatus according to claim 23, wherein the beam direction determining unit is adapted to determine that any type of uplink beam among SRS, PUSCH, and PUCCH is received in an uplink beam that has received the uplink transmission last time, and the direction of the downlink beam or the direction of the uplink beam corresponding to the uplink beam is taken as the beam direction to be monitored.
28. The apparatus of downlink LBT as claimed in claim 23, wherein said listening unit is adapted to listen to a beam to be listened to at the same time.
29. The apparatus of downlink LBT as claimed in claim 28, wherein said listening unit is adapted to terminate listening to a beam to be listened to after determining that the beam to be listened to is not suitable for data transmission, and start listening to another beam to be listened to after terminating listening to the beam to be listened to.
30. The apparatus of downlink LBT as claimed in claim 29, wherein determining that one beam to be listened to is not suitable for data transmission comprises: and in a preset time length, the beam to be monitored does not meet the condition suitable for data transmission.
31. The apparatus of downlink LBT as claimed in claim 23, wherein said listening unit is adapted to listen to a plurality of beams to be listened to at the same time.
32. The apparatus of downlink LBT as claimed in claim 31, wherein said listening unit is adapted to start listening to all beams to be listened to simultaneously until finding a beam suitable for data transmission in all beams to be listened to or confirming that all beams to be listened to are not suitable for data transmission.
33. The apparatus of downlink LBT as claimed in claim 32, wherein said adaptation for data transmission is determined by: all timeslots are measured to be free for one delay period and all timeslots are measured to be free for an integer number of additional delay periods.
34. The apparatus of claim 33, wherein the number of the additional delay durations is determined according to priorities of different beams to be monitored, and the higher the priority of the beams to be monitored, the smaller the number of the additional delay durations to be measured.
35. The apparatus of claim 34, wherein the priority of the different beams to be monitored is determined according to the priority of the terminal transmitting on the LAA.
36. The apparatus of downlink LBT as claimed in claim 31, wherein said listening unit comprises:
the delay time monitoring subunit is suitable for monitoring each beam to be monitored in the delay time;
a variable setting subunit adapted to set Ni＝NinitIn which N isiCorresponding to each beam direction to be monitored, i belongs to m, m is the number of beams to be monitored, NinitIs the interval [0, CW]The CW is configured according to the priority transmitted by the terminal on the LAA;
a confirmation subunit, for each beam direction to be monitored, if any NiA value of 0, and the NiIf all time slots corresponding to the beams to be monitored are idle in the delay time length, the N is confirmediThe corresponding beam to be monitored is suitable for data transmission;
the variable value changes the sub-unit, for each beam direction to be monitored, if Ni> 0, and grant NiWhen the value is changed, N is obtainedi＝Ni-1；
A repeating subunit adapted to repeat the pair N when the monitoring result is idle in the time slot of the additional delay duration in the monitoring beam directioniAnd (5) judging the value.
37. The apparatus of downlink LBT as claimed in claim 23, further comprising: and the data transmission unit is suitable for carrying out data transmission by utilizing the beam which is suitable for carrying out data transmission to assist.
38. The apparatus of downlink LBT as claimed in claim 23, further comprising: and the notification unit is suitable for notifying the terminal of the beam direction suitable for downlink data transmission.
39. The apparatus according to claim 38, wherein the notifying unit is adapted to notify the terminal of the beam direction suitable for downlink data transmission through the authorized primary cell.
40. The apparatus according to claim 39, wherein the notifying unit is adapted to notify the terminal of the beam direction suitable for downlink data transmission through at least one of PDCCH, MAC-CE, and RRC in the authorized primary cell.
41. The apparatus according to claim 38, wherein the notifying unit is adapted to notify the terminal of the beam direction suitable for downlink data transmission through an unlicensed LAA.
42. The apparatus of downlink LBT as claimed in claim 41, wherein the notifying unit is adapted to notify the terminal of the beam direction suitable for downlink data transmission through at least one of PDCCH, MAC-CE and RRC carried by unlicensed LAA.
43. The apparatus of downlink LBT according to any one of claims 40 or 42, wherein the notifying unit notifies the terminal of the beam direction suitable for downlink data transmission through PDCCH comprises: and informing the terminal of the beam direction suitable for downlink data transmission through the TCI state in the DCI.
44. The apparatus of claim 38, wherein the notifying unit is adapted to receive a receiving capability reported by the terminal, and determine, according to the receiving capability, to notify the terminal of the number of beam directions suitable for downlink data transmission.
45. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, performs the steps of the method for downlink LBT according to any one of claims 1 to 22.
46. A base station comprising a memory and a processor, said memory having stored thereon a computer program operable on said processor, wherein said processor, when executing said computer program, performs the steps of the method for downlink LBT according to any of claims 1 to 22.
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