CN110572854B

CN110572854B - Beam recovery method, system, base station, terminal and computer-readable storage medium

Info

Publication number: CN110572854B
Application number: CN201810573637.8A
Authority: CN
Inventors: 郭婧; 蒋峥; 陈鹏; 杨峰义; 毕奇
Original assignee: China Telecom Corp Ltd
Current assignee: China Telecom Corp Ltd
Priority date: 2018-06-06
Filing date: 2018-06-06
Publication date: 2021-10-22
Anticipated expiration: 2038-06-06
Also published as: CN110572854A

Abstract

The present disclosure relates to a beam recovery method, a system, a base station, a terminal and a computer-readable storage medium, and relates to the field of communication technologies. The method of the present disclosure comprises: a base station receives a quick wave beam failure recovery request sent by a terminal, wherein the quick wave beam failure recovery request carries a failed transmitted wave beam identifier; the base station determines candidate transmitting beams to be switched from a pre-established candidate transmitting beam set according to a preset switching rule; and the base station switches the downlink information sent to the terminal by the failed transmitting wave beam to the transmitting candidate wave beam to be switched for transmitting. Aiming at the scene requirements of 5G high speed and low time delay, the scheme of the disclosure reduces the signaling interaction between the base station and the terminal, and reduces the beam failure recovery time delay and the system overhead spent in the beam failure recovery process.

Description

Beam recovery method, system, base station, terminal and computer-readable storage medium

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to a method, a system, a base station, a terminal, and a computer-readable storage medium for beam recovery.

Background

Future 5G (5th-Generation, fifth Generation mobile communication technology) mobile communication systems face the demands of ultra-large traffic density, ultra-high transmission rate, lower transmission delay, more reliable network performance and coverage capability, etc.

Beamforming techniques are proposed in 3GPP (3rd Generation Partnership Project) standardization meetings, where a base station may cover its serving cell with multiple beams. In the downlink communication process, the base station negotiates with the terminal to determine the optimal transmitting beam through the measurement of the terminal on different beams, so that the terminal can receive downlink signals through the optimal transmitting beam.

Disclosure of Invention

The inventor finds that: in the communication process, a transmission beam of downlink communication between the base station and the terminal may have a beam failure problem due to various problems, and at this time, the terminal needs to reestablish downlink connection with the base station and needs to perform beam recovery. Currently, specific schemes regarding beam recovery are still under discussion.

One technical problem to be solved by the present disclosure is: how to realize beam recovery in the downlink communication process.

According to some embodiments of the present disclosure, there is provided a beam recovery method, including: a base station receives a quick wave beam failure recovery request sent by a terminal, wherein the quick wave beam failure recovery request carries a failed transmitted wave beam identifier; the base station determines candidate transmitting beams to be switched from a pre-established candidate transmitting beam set according to a preset switching rule; and the base station switches the downlink information sent to the terminal by the failed transmitting wave beam to the transmitting candidate wave beam to be switched for transmitting.

In some embodiments, the set of candidate transmit beams comprises: candidate transmitting beams and priorities corresponding to the candidate transmitting beams; the base station determines candidate transmitting beams to be switched from a pre-established candidate beam set according to a preset switching rule, wherein the candidate transmitting beams to be switched comprise: and the base station selects candidate transmitting beams with the priority lower than the failed transmitting beams from a pre-established candidate transmitting beam set according to the switching sequence of the priorities of the candidate transmitting beams from high to low, and determines the candidate transmitting beams to be switched.

In some embodiments, the candidate transmit beam set is determined by the base station in response to a beam reporting message of the terminal during a last beam scanning process, the beam reporting message including an identification of the candidate beam and corresponding signal quality information; the priority corresponding to the candidate transmit beam is determined by the base station based on the signal quality information of the candidate transmit beam.

In some embodiments, the determining, by the base station, the candidate transmit beam to be switched from the pre-established candidate transmit beam set according to the preset switching rule includes: the base station judges whether the times of the terminal sending the rapid wave beam failure recovery request reach preset times or not; and the base station determines the candidate transmitting wave beam to be switched from the pre-established candidate transmitting wave beam set according to a preset switching rule under the condition that the frequency of the terminal sending the quick wave beam failure recovery request is less than the preset frequency.

In some embodiments, the method further comprises: and the base station sends a downlink beam scanning instruction to the terminal under the condition that the frequency of the rapid beam failure recovery request sent by the terminal reaches a preset frequency, so that beam switching is carried out according to the transmitted beam obtained by beam scanning.

In some embodiments, the method further comprises: the base station determines whether to start a rapid wave beam failure recovery function according to the data transmission requirement of the current terminal and informs the terminal; the base station receives a fast beam failure recovery request sent by a terminal, and the fast beam failure recovery request comprises the following steps: and under the condition that the rapid wave beam failure recovery function is started, the base station receives a rapid wave beam failure recovery request sent by the terminal.

In some embodiments, the method further comprises: a base station receives a quick wave beam failure recovery function starting request or a quick wave beam failure recovery function closing request sent by a terminal; the base station determines whether to start a rapid wave beam failure recovery function according to the data transmission requirement of the current terminal and informs the terminal; the base station receives a fast beam failure recovery request sent by a terminal, and the fast beam failure recovery request comprises the following steps: and under the condition that the rapid wave beam failure recovery function is started, the base station receives a rapid wave beam failure recovery request sent by the terminal.

According to further embodiments of the present disclosure, there is provided a beam recovery method including: the terminal sends a quick wave beam failure recovery request to the base station, wherein the quick wave beam failure recovery request carries a failed transmitted wave beam identifier; the terminal determines candidate transmitting beams to be switched from a pre-established candidate transmitting beam set according to a preset switching rule; and the terminal receives the downlink information originally sent by the base station through the failed transmitting wave beam through the candidate transmitting wave beam to be switched.

In some embodiments, the pre-established set of candidate transmit beams comprises: candidate transmitting beams and priorities corresponding to the candidate transmitting beams; the terminal determines candidate transmitting beams to be switched from a pre-established candidate transmitting beam set according to a preset switching rule, wherein the candidate transmitting beams to be switched comprise: and the terminal selects the candidate transmitting wave beam with the priority lower than the failed transmitting wave beam from the pre-established candidate transmitting wave beam set according to the switching sequence of the priority of the candidate transmitting wave beam from high to low, and determines the candidate transmitting wave beam to be switched.

In some embodiments, the candidate transmit beam set is determined by the terminal according to a beam reporting message sent to the base station in the last beam scanning process, where the beam reporting message includes an identifier of the candidate beam and corresponding signal quality information; the priority corresponding to the candidate transmission beam is determined by the terminal according to the signal quality information of the candidate transmission beam.

In some embodiments, the determining, by the terminal, the candidate transmission beam to be switched from the pre-established candidate transmission beam set according to the preset switching rule includes: and under the condition that the terminal does not receive a downlink beam scanning instruction sent by the base station, determining the candidate transmitting beam to be switched from the pre-established candidate transmitting beam set according to a preset switching rule.

In some embodiments, the method further comprises: the terminal executes the beam scanning process under the condition of receiving a downlink beam scanning instruction sent by the base station so as to switch beams according to the emitted beams obtained by beam scanning; the downlink beam scanning instruction is sent by the base station under the condition that the base station judges that the frequency of the rapid beam failure recovery request sent by the terminal reaches a preset frequency.

In some embodiments, the terminal sending the fast beam failure recovery request to the base station comprises: under the condition that the rapid wave beam failure recovery function is started, the terminal sends a rapid wave beam failure recovery request to the base station; the fast beam failure recovery function is that the base station determines whether to start and informs the terminal according to the data transmission requirement of the current terminal.

In some embodiments, the method further comprises: the terminal sends a quick wave beam failure recovery function starting request to the base station and receives a quick wave beam failure recovery function starting response sent by the base station; the terminal sends the fast beam failure recovery request to the base station, and the fast beam failure recovery request comprises the following steps: under the condition that the rapid wave beam failure recovery function is started, the terminal sends a rapid wave beam failure recovery request to the base station; the fast beam failure recovery function is that the base station determines whether to be started according to the data transmission requirement of the current terminal.

According to still other embodiments of the present disclosure, there is provided a base station including: the receiver is used for receiving a fast beam failure recovery request sent by the terminal, wherein the fast beam failure recovery request carries a failed transmitted beam identifier; the beam selection module is used for determining candidate transmitting beams to be switched from a pre-established candidate transmitting beam set according to a preset switching rule; and the transmitter is used for switching the downlink information which passes the failed transmitting wave beam to the terminal to the transmitting candidate wave beam to be switched to transmit.

In some embodiments, the set of candidate transmit beams comprises: candidate transmitting beams and priorities corresponding to the candidate transmitting beams; the beam selection module is used for selecting candidate transmitting beams with the priority lower than that of failed transmitting beams from a pre-established candidate transmitting beam set according to the switching sequence of the priorities of the candidate transmitting beams from high to low, and determining the candidate transmitting beams to be switched.

In some embodiments, the base station further comprises: and the request frequency judging module is used for judging whether the frequency of the rapid beam failure recovery request sent by the terminal reaches the preset frequency, and under the condition that the frequency of the rapid beam failure recovery request sent by the terminal is less than the preset frequency, the trigger beam selecting module determines the candidate transmitting beam to be switched from the pre-established candidate transmitting beam set according to the preset switching rule.

In some embodiments, the request number judging module is configured to notify the transmitter when the number of times that the terminal sends the fast beam failure recovery request reaches a preset number of times; the transmitter is used for sending a downlink beam scanning instruction to the terminal so as to switch beams according to the transmitting beams obtained by beam scanning.

In some embodiments, the base station further comprises: the first function starting module is used for determining whether to start the rapid beam failure recovery function according to the data transmission requirement of the current terminal and informing the terminal; the receiver is configured to receive a fast beam failure recovery request sent by the terminal when the fast beam failure recovery function is turned on.

In some embodiments, the receiver is further configured to receive a fast beam failure recovery function on request or a fast beam failure recovery function off request sent by the terminal; the base station further comprises: the second function starting module is used for determining whether to start the rapid beam failure recovery function according to the data transmission requirement of the current terminal and informing the terminal; the receiver is configured to receive a fast beam failure recovery request sent by the terminal when the fast beam failure recovery function is turned on.

According to still further embodiments of the present disclosure, there is provided a terminal including: the transmitter is used for sending a fast wave beam failure recovery request to the base station, wherein the fast wave beam failure recovery request carries a failed transmitted wave beam identifier; the beam selection module is used for determining candidate transmitting beams to be switched from a pre-established candidate transmitting beam set according to a preset switching rule; and the receiver is used for receiving the downlink information originally sent by the base station through the failed transmitting wave beam through the candidate transmitting wave beam to be switched.

In some embodiments, the pre-established set of candidate transmit beams comprises: candidate transmitting beams and priorities corresponding to the candidate transmitting beams; the beam selection module is used for selecting candidate transmitting beams with the priority lower than that of failed transmitting beams from a pre-established candidate transmitting beam set according to the switching sequence of the priorities of the candidate transmitting beams from high to low, and determining the candidate transmitting beams to be switched.

In some embodiments, when the receiver does not receive a downlink beam scanning instruction sent by the base station, the beam selection module is configured to determine a candidate transmit beam to be switched from a pre-established candidate transmit beam set according to a preset switching rule.

In some embodiments, the terminal further comprises: the beam scanning module is used for executing a beam scanning process under the condition that the receiver receives a downlink beam scanning instruction sent by the base station so as to switch beams according to the transmitted beams obtained by beam scanning; the downlink beam scanning instruction is sent by the base station under the condition that the base station judges that the frequency of the rapid beam failure recovery request sent by the terminal reaches a preset frequency.

In some embodiments, the transmitter is configured to transmit a fast beam failure recovery request to the base station if the fast beam failure recovery function is on; the fast beam failure recovery function is that the base station determines whether to start and informs the terminal according to the data transmission requirement of the current terminal.

In some embodiments, the transmitter is further configured to send a fast beam failure recovery function on request to the base station, and send the fast beam failure recovery request to the base station when the fast beam failure recovery function is on; the receiver is also used for receiving a quick wave beam failure recovery function starting response sent by the base station; the fast beam failure recovery function is that the base station determines whether to be started according to the data transmission requirement of the current terminal.

According to still other embodiments of the present disclosure, there is provided a base station including: a memory; and a processor coupled to the memory, the processor configured to perform the method of beam recovery on the base station side as in any of the preceding embodiments based on instructions stored in the memory device.

According to still further embodiments of the present disclosure, there is provided a terminal including: a memory; and a processor coupled to the memory, the processor configured to perform the method of beam recovery on the terminal side as in any of the preceding embodiments based on instructions stored in the memory device.

According to further embodiments of the present disclosure, there is provided a computer readable storage medium having a computer program stored thereon, wherein the program, when executed by a processor, implements the steps of the beam recovery method of any of the preceding embodiments.

The scheme of the disclosure relates to a fast beam failure recovery method, after a base station receives a fast beam failure recovery request sent by a terminal, the base station immediately determines a candidate transmitting beam to be switched from a pre-established candidate transmitting beam set according to a preset switching rule, so that downlink information sent to the terminal through the failed transmitting beam is switched to the candidate transmitting beam to be switched for transmitting. Aiming at the scene requirements of 5G high speed and low time delay, the scheme of the disclosure reduces the signaling interaction between the base station and the terminal, and reduces the beam failure recovery time delay and the system overhead spent in the beam failure recovery process.

Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 illustrates a flow diagram of a beam recovery method of some embodiments of the present disclosure.

Fig. 2 shows a flow diagram of a beam recovery method of further embodiments of the present disclosure.

Fig. 3 shows a flow diagram of a beam recovery method of further embodiments of the present disclosure.

Fig. 4 shows a flow diagram of a beam recovery method of further embodiments of the present disclosure.

Fig. 5 shows a schematic structural diagram of a base station of some embodiments of the present disclosure.

Fig. 6 shows a schematic structural diagram of a base station of further embodiments of the present disclosure.

Fig. 7 illustrates a schematic structural diagram of a terminal of some embodiments of the present disclosure.

Fig. 8 shows a schematic structural diagram of a base station of further embodiments of the present disclosure.

Fig. 9 shows a schematic structural diagram of a base station of further embodiments of the present disclosure.

Fig. 10 shows a schematic structural diagram of a terminal of further embodiments of the present disclosure.

Fig. 11 shows a schematic structural diagram of a terminal according to further embodiments of the present disclosure.

Fig. 12 shows a schematic structural diagram of a beam recovery system of some embodiments of the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

For the 5G scenario and requirement, a beam recovery method is proposed, and some embodiments of the beam recovery method of the present disclosure are described below with reference to fig. 1.

Fig. 1 is a flow diagram of some embodiments of the disclosed beam recovery methods. As shown in fig. 1, the method of this embodiment includes: steps S102 to S106.

Step S102, the terminal sends a fast wave beam failure recovery request to the base station, and correspondingly, the base station receives the fast wave beam failure recovery request sent by the terminal.

The terminal may determine whether the currently used downlink transmission beam fails by determining whether Reference Signal Receiving Power (RSRP) of the measurement beam is lower than an RSRP threshold or whether Block Error Rate (BLER) of the measurement beam is higher than a BLER threshold. If the RSRP of the currently used downlink transmission beam is lower than the RSRP threshold or the BLER is higher than the BLER threshold, the terminal may immediately initiate a fast beam failure recovery request, where the fast beam failure recovery request carries the failed transmission beam identifier.

And step S104, the base station determines candidate transmitting beams to be switched from the pre-established candidate transmitting beam set according to a preset switching rule. Correspondingly, the terminal determines the candidate transmitting wave beam to be switched from the pre-established candidate transmitting wave beam set according to the preset switching rule.

The preset switching can be configured in advance in the terminal and the base station, the terminal initiates a fast beam failure recovery request, and the base station receives the fast beam failure recovery request, and then the terminal or the base station can be triggered to inquire a switching rule agreed in advance, and candidate transmitting beams to be switched are determined from a candidate transmitting beam set established in advance.

The pre-established candidate transmitting beam sets can be respectively stored at the base station side and the terminal side, and the contents are the same. The set of candidate transmit beams includes at least one candidate transmit beam. If the candidate transmit beam set only includes one candidate transmit beam, the preset switching rule may be configured to directly select the candidate transmit beam of the candidate transmit beam set to determine as the candidate transmit beam to be switched.

In some embodiments, the set of candidate transmit beams comprises: the candidate transmit beams and the corresponding priorities or selection orders of the candidate transmit beams. The candidate transmit beams may be represented by a unique identification of the candidate transmit beam. The candidate transmit beam identifications may be arranged according to a priority from large to small, indicating the priority of the candidate transmit beams. For example, the identities of the candidate transmit beams are arranged in descending order of priority {3,2,1,0}, which set may represent the actual stored set of candidate transmit beams. The specific representation manner of the candidate transmission beam set may be selected according to actual requirements, for example, the candidate transmission beam set is represented in a vector or a table, and is not limited to the illustrated example.

Further, the preset switching rule may be configured to sequentially select the candidate transmit beams to be switched according to a switching order from high priority to low priority of the candidate transmit beams. The candidate transmitting beams with the priority lower than the failed transmitting beam can be selected from the pre-established candidate transmitting beam set according to the switching order of the priority of the candidate transmitting beams from high to low, and the candidate transmitting beams to be switched can be determined. The failed transmit beam may be one of the candidate transmit beams. If the candidate transmission beams in the candidate transmission beam set are arranged in the order from high priority to low priority, the candidate transmission beams can be sequentially selected according to the arrangement order.

The preset rules and the candidate transmitting beams in the candidate transmitting beam set can be configured according to actual requirements, and the preset rules and the candidate transmitting beam set of the base station side and the terminal side are ensured to be consistent, so that the candidate transmitting beams to be switched determined by the base station side and the terminal side are the same.

To further reduce signaling interaction between devices, system overhead is reduced. The candidate transmit beam sets may be generated automatically at the base station side and the terminal side, respectively, without requiring interaction between the base station and the terminal, or other devices, for generation of the sets.

In some embodiments, the set of candidate transmit beams is determined at the base station side by the base station in response to signal quality information of the transmit beams reported by the terminal. Accordingly, the candidate transmit beam set is determined by the terminal according to the measured signal quality information of the transmit beam at the terminal side. For example, the set of candidate transmit beams includes: the signal quality measured by the terminal exceeds the transmission beam corresponding to the threshold value. The better the signal quality the higher the priority of the candidate transmit beam.

In some embodiments, the candidate transmit beam set is determined at the base station side in response to a beam report message from the terminal during a last beam sweep. Correspondingly, the candidate transmission beam set is determined by the terminal according to the beam reporting message sent to the base station in the last beam scanning process at the terminal side. The terminal sends the beam reporting message and generates the candidate transmitting beam set without sequence. The beam reporting message may include: identification of candidate beams and corresponding signal quality information. Further, the priority corresponding to the candidate transmission beam is determined by the base station or the terminal according to the signal quality information of the candidate transmission beam.

In the beam scanning process, the base station may transmit the wireless signal using the transmission beams of different orientations in sequence. Meanwhile, the terminal measures the quality information of the wireless signals transmitted by different wave beams and reports the quality information of the wireless signals to the base station. The beam report message may include signal quality information of at least one candidate transmission beam measured by the terminal. For example, the beam reporting message may include signal quality information for 1, 2, 4, or 8 candidate transmit beams.

The base station can determine the best transmitting beam aiming at the terminal according to the beam reporting message, and can also determine the priority of each candidate transmitting beam to obtain a candidate transmitting beam set. Meanwhile, the terminal obtains a candidate transmitting beam set according to the measurement result. The better the signal quality the higher the priority of the candidate transmit beam. The beam scanning process can be performed according to the indication of the base station, and can also be performed periodically. The signal quality information of the candidate transmit beams includes, for example: at least one of RSRP and BLER of the candidate transmit beam.

And step S106, the base station switches the downlink information which is sent to the terminal through the failed transmitting wave beam to the transmitting candidate wave beam to be switched to transmit. Correspondingly, the terminal receives the downlink information originally sent by the base station through the failed transmitting beam through the candidate transmitting beam to be switched.

Before switching downlink signals, the base station may send a switching preparation message to the terminal to notify the terminal that the base station has selected a candidate transmit beam to be switched to prepare for switching. The terminal can return a switching confirmation message to the base station to inform the base station that the terminal also completes the determination of the candidate transmitting beam to be switched, and switching can be carried out. The switching preparation message and the switching confirmation message can not include the identification of the candidate transmitting beam to be switched, thereby reducing the complexity of signaling and reducing the information transmission quantity.

The method of the embodiment relates to a fast beam failure recovery method, wherein a base station immediately determines a candidate transmitting beam to be switched from a pre-established candidate transmitting beam set according to a preset switching rule after receiving a fast beam failure recovery request sent by a terminal, so that downlink information sent to the terminal through the failed transmitting beam is switched to the transmitting candidate beam to be switched for transmitting. Aiming at the scene requirements of 5G high speed and low time delay, the scheme of the embodiment reduces the signaling interaction between the base station and the terminal, and reduces the beam failure recovery time delay and the system overhead spent in the beam failure recovery process.

Compared with the scheme that the base station comprehensively considers the system condition according to the beam failure recovery request to determine whether to perform beam switching or perform beam scanning again, and feeds back the beam failure recovery response to the terminal, the method of the embodiment can greatly reduce the system overhead and the beam recovery time delay, and is more suitable for 5G application scenes. In addition, the method of the embodiment determines the candidate beam to be switched according to the signal quality information of the candidate transmitting beam, so that the beam recovery efficiency can be improved, and the probability of beam recovery failure can be reduced.

Further embodiments of the disclosed beam recovery method are described below in conjunction with fig. 2.

Fig. 2 is a flow chart of further embodiments of the beam recovery method of the present disclosure. As shown in fig. 2, the method of this embodiment includes: steps S202 to S208.

In step S202, the terminal sends a fast beam failure recovery request to the base station in response to detecting the transmission beam failure.

In step S204, the base station, in response to receiving the fast beam failure recovery request, determines whether the number of times that the terminal sends the fast beam failure recovery request reaches a preset number of times, if so, performs step S205, otherwise, performs step S206.

The base station may add one to the number of fast beam requests corresponding to the terminal each time the base station receives a fast beam failure recovery request sent by the terminal. The predetermined number of times is less than or equal to the number of candidate transmit beams in the set of candidate transmit beams.

Step S205, the base station sends a downlink beam scanning instruction to the terminal.

The base station sends a downlink beam scanning command to the terminal, and can simultaneously return the number of times of the fast beam requests corresponding to the terminal to zero.

Step S207, the base station and the terminal perform beam switching according to the transmission beam obtained by beam scanning.

And the terminal performs beam scanning and beam reporting again, can reselect the optimal transmitting beam and generate a candidate transmitting beam set. And the base station switches the downlink information sent to the terminal through the failed transmitting wave beam to the re-determined optimal transmitting candidate wave beam for transmitting. Correspondingly, the terminal receives the downlink information originally sent by the base station through the failed transmitting beam through the re-determined optimal transmitting beam.

Step S206, the base station and the terminal determine candidate transmitting wave beams to be switched from the pre-established candidate transmitting wave beam set according to the preset switching rule.

And step S208, the base station switches the downlink information which is sent to the terminal through the failed transmitting wave beam to the transmitting candidate wave beam to be switched to transmit. Correspondingly, the terminal receives the downlink information originally sent by the base station through the failed transmitting beam through the candidate transmitting beam to be switched.

In the method of the embodiment, the beam scanning is performed again under the condition that the failure times of the terminal to report the transmitted beam reach the preset times. And under the condition that the frequency of the beam failure reporting and transmitting by the terminal does not reach the preset frequency, the rapid beam failure recovery is carried out, and the success rate of the beam recovery is improved while the beam failure recovery time delay and the system overhead spent in the beam failure recovery process are reduced.

The base station and the terminal may also turn on and off the fast beam failure recovery function, which is described below in conjunction with fig. 3.

Fig. 3 is a flow chart of still other embodiments of the disclosed beam recovery methods. As shown in fig. 3, the method of this embodiment includes: steps S302 to S306.

Step S302, the base station determines whether to turn on or turn off the fast beam failure recovery function according to the data transmission requirement of the current terminal. If the fast beam failure recovery function is turned on, step S304 is performed, otherwise, step S306 is performed.

The base station judges the data transmission requirement of the current terminal, the required time delay is lower than a time delay threshold value, the required speed is higher than a speed threshold value, and the required data transmission with the channel quality lower than a channel quality threshold value can start a rapid beam failure recovery function. The fast beam failure recovery function may be turned off for other data transmission needs.

According to experience and test results, application scenarios corresponding to different data transmission requirements can be configured in advance, and whether the application scenarios correspond to the fact that the rapid beam failure recovery function is started or not can be judged. For example, a data transmission requirement with low latency and high rate and less channel quality requirement corresponds to an application scenario of voice call, in which beam recovery needs to be performed immediately, and therefore, corresponds to a function of starting fast beam failure recovery. For another example, for an application scenario where the data transmission requirement with low delay and rate requirements corresponds to a video, in such a scenario, beam recovery may not be required to be performed immediately, and therefore, the fast beam failure recovery function may be turned off.

The base station may monitor a delay and a rate of data transmission of the terminal within a preset time period, and if the delay is lower than a delay threshold, the rate is higher than a rate threshold, and a current communication scenario of the terminal is lower than a channel quality threshold for a channel quality, a fast beam failure recovery function may be started.

Step S304, the base station sends an instruction for starting the fast beam failure recovery function to the terminal.

An instruction to turn on the Fast Beam Failure Recovery function is, for example, BS _ Fast _ BFR _ Open, (BFR, Beam Failure Recovery). The terminal may reply to the base station with an acknowledgement message that the fast beam failure recovery function is on.

Step S306, the base station sends an instruction of closing the fast beam failure recovery function to the terminal.

An instruction to turn off the Fast beam failure recovery function is, for example, BS _ Fast _ BFR _ Close. The terminal may reply to the base station with an acknowledgement message that the fast beam failure recovery function is off.

Under the condition that the fast beam failure recovery function is turned on, the terminal may initiate a fast beam failure recovery request.

The base station may determine whether to turn on the fast beam failure recovery function based on a communication scenario of the terminal. The terminal can also request whether to start the fast beam failure recovery function according to the requirement. Described below in conjunction with fig. 4.

Fig. 4 is a flow chart of still other embodiments of the disclosed beam recovery method. As shown in fig. 4, the method of this embodiment includes: steps S402 to S406.

Step S402, the terminal sends a fast beam failure recovery function opening request or a fast beam failure recovery function closing request to the base station. Correspondingly, the base station receives a fast beam failure recovery function opening request or a fast beam failure recovery function closing request sent by the terminal.

The Fast beam failure recovery function on Request is, for example, UE _ Fast _ BFR _ Open _ Request, and the Fast beam failure recovery function off Request is, for example, UE _ Fast _ BFR _ Close _ Request.

Step S404, the base station determines whether to turn on or turn off the fast beam failure recovery function according to the data transmission requirement of the current terminal.

Turning on or off the fast beam failure recovery function may refer to the methods of the previous embodiments.

Step S406, the base station sends a fast beam failure recovery function response to the terminal. Correspondingly, the terminal receives the fast beam failure recovery function response sent by the base station.

The Fast beam failure recovery function request Response is, for example, BS _ Fast _ BFR _ Response, and it may be designed that 1 bit represents on or off of the Fast beam failure recovery function. For example, "0" indicates turning off the fast beam failure recovery function, and "1" indicates turning on the fast beam failure recovery function. Under the condition that the fast beam failure recovery function is turned on, the terminal may initiate a fast beam failure recovery request.

In the method of the embodiment, the base station or the terminal can trigger the on or off of the rapid beam failure recovery function, so that the flexibility of beam recovery is improved. Further, the base station determines whether to start the rapid beam failure recovery function based on the data transmission requirement of the terminal, and the transmitted beam may be switched to a beam with slightly poor quality due to the rapid beam failure recovery, so that the success rate of beam recovery is improved through the judgment of the base station.

One application example of the disclosed beam recovery method is described below.

(1) And the terminal reports N candidate transmitting beams through the beam scanning process.

The N candidate transmit beams may be determined by an RSRP or BLER value measured by the terminal, and then the terminal reports the ID numbers of the N candidate transmit beams and the corresponding RSRP or BLER values to the base station by beam reporting.

(2) And the base station and the terminal sequence the candidate transmitting beams according to the RSRP or BLER values of the N candidate transmitting beams to generate a candidate transmitting beam set.

The rank of the candidate transmit beams indicates the corresponding priority, and for example, a rank table of candidate beam usage and handover known to both parties may be formulated to indicate the set of candidate transmit beams. As shown in table 1, the right column indicates candidate transmission beam IDs, and the priorities of the candidate transmission beams are sequentially lowered in order from top to bottom, and at the same time, the order may reflect the switching order of the candidate transmission beams.

TABLE 1

(3) And under the condition that the rapid wave beam failure recovery function is started, the terminal initiates a rapid wave beam failure recovery request to the base station.

For example, when a beam failure occurs in the transmission beam 3, the terminal sends a fast beam failure recovery request to the base station, carrying the identifier 3 of the failed transmission beam.

(4) And the base station judges whether the times of the terminal initiating the rapid beam failure recovery request reach preset times.

The preset number of times is, for example, N, the number of beams in the candidate transmit beam set. If M > is equal to N, step (5) is executed, and if M < N, step (6) is executed.

(5) And the base station informs the terminal to perform downlink beam scanning again so as to re-determine the N candidate transmitting beams.

(6) And the base station realizes beam switching according to the fast beam failure recovery scheme and updates the fast beam failure recovery request number M to be M + 1.

The base station and the terminal inquire a predetermined switching rule and immediately switch to the corresponding available candidate transmitting wave beam. I.e. the base station and the terminal fail to transmit the candidate transmission beam 3 according to table 1 and may choose to switch to the candidate transmission beam 2. If the candidate transmit beam 2 fails, switch to candidate transmit beam 1, and so on.

The present disclosure also provides a base station, described below in conjunction with fig. 5.

Fig. 5 is a block diagram of some embodiments of a base station of the present disclosure. As shown in fig. 5, the base station 50 of this embodiment includes: a receiver 502, a beam selection module 504, and a transmitter 506.

The receiver 502 is configured to receive a fast beam failure recovery request sent by a terminal, where the fast beam failure recovery request carries a failed transmit beam identifier.

A beam selecting module 504, configured to determine a candidate transmit beam to be switched from a pre-established candidate transmit beam set according to a preset switching rule.

In some embodiments, the set of candidate transmit beams comprises: the candidate transmit beams and the priorities corresponding to the candidate transmit beams. The beam selection module 504 is configured to select a candidate transmit beam with a priority lower than that of a failed transmit beam from a pre-established candidate transmit beam set according to a switching order of priorities of the candidate transmit beams from high to low, and determine the candidate transmit beam as a candidate transmit beam to be switched.

A transmitter 506, configured to switch the downlink information sent to the terminal by the failed transmission beam to a transmission candidate beam to be switched for transmission.

In some embodiments, the base station 50 further comprises: the request frequency determining module 508 is configured to determine whether the frequency of the fast beam failure recovery request sent by the terminal reaches a preset frequency, and when the frequency of the fast beam failure recovery request sent by the terminal is smaller than the preset frequency, the trigger beam selecting module determines a candidate transmit beam to be switched from a pre-established candidate transmit beam set according to a preset switching rule.

In some embodiments, the request number judging module 508 is configured to notify the transmitter 506 when the number of times that the terminal sends the fast beam failure recovery request reaches a preset number; the transmitter 506 is configured to send a downlink beam scanning instruction to the terminal, so as to perform beam switching according to a transmission beam obtained by beam scanning.

In some embodiments, the base station 50 further comprises: a first function starting module 510, configured to determine whether to start a fast beam failure recovery function according to a data transmission requirement of a current terminal, and notify the terminal; the receiver 502 is configured to receive a fast beam failure recovery request sent by a terminal when the fast beam failure recovery function is turned on.

Further embodiments of the base station of the present disclosure are described below in conjunction with fig. 6.

Fig. 6 is a block diagram of some embodiments of a base station of the present disclosure. As shown in fig. 6, the base station 60 of this embodiment includes: the receiver 602, beam selection module 604, and transmitter 606 are similar to the receiver 502, beam selection module 504, and transmitter 506, respectively.

In some embodiments, the receiver 602 is further configured to receive a fast beam failure recovery function on request or a fast beam failure recovery function off request sent by the terminal. The base station 60 further includes: a second function starting module 608, configured to determine whether to start the fast beam failure recovery function according to a data transmission requirement of the current terminal, and notify the terminal; the receiver 602 is configured to receive a fast beam failure recovery request sent by a terminal when the fast beam failure recovery function is turned on.

The present disclosure also provides a terminal, described below in conjunction with fig. 7.

Fig. 7 is a block diagram of some embodiments of the terminal of the present disclosure. As shown in fig. 7, the terminal 70 of this embodiment includes: a transmitter 702, a beam selection module 704, and a receiver 706.

The transmitter 702 is configured to send a fast beam failure recovery request to the base station, where the fast beam failure recovery request carries a failed transmit beam identifier.

A beam selecting module 704, configured to determine a candidate transmit beam to be switched from a pre-established candidate transmit beam set according to a preset switching rule.

In some embodiments, the pre-established set of candidate transmit beams comprises: candidate transmitting beams and priorities corresponding to the candidate transmitting beams; the beam selecting module 704 is configured to select a candidate transmit beam with a priority lower than that of the failed transmit beam from a pre-established candidate transmit beam set according to a switching order of priorities of the candidate transmit beams from high to low, and determine the candidate transmit beam to be switched.

The receiver 706 is configured to receive, through the candidate transmit beam to be switched, downlink information originally sent by the base station through the failed transmit beam.

In some embodiments, in case that the receiver 706 does not receive the downlink beam scanning instruction sent by the base station, the beam selecting module 704 is configured to determine a candidate transmit beam to be switched from a pre-established candidate transmit beam set according to a preset switching rule.

In some embodiments, the terminal 70 further comprises: a beam scanning module 708, configured to execute a beam scanning process when the receiver receives a downlink beam scanning instruction sent by the base station, so as to perform beam switching according to a transmission beam obtained by beam scanning; the downlink beam scanning instruction is sent by the base station under the condition that the base station judges that the frequency of the rapid beam failure recovery request sent by the terminal reaches a preset frequency.

In some embodiments, the transmitter 702 is configured to transmit a fast beam failure recovery request to the base station if the fast beam failure recovery function is on; the fast beam failure recovery function is that the base station determines whether to start and informs the terminal according to the data transmission requirement of the current terminal.

In some embodiments, the transmitter 702 is further configured to send a fast beam failure recovery function on request to the base station, and in case the fast beam failure recovery function is on, send the fast beam failure recovery request to the base station; the receiver 706 is further configured to receive a fast beam failure recovery function start response sent by the base station; and the quick beam failure recovery function is that the base station determines whether to be started according to the data transmission requirement of the current terminal.

The base stations in embodiments of the present disclosure may each be implemented by various computing devices or computer systems, described below in conjunction with fig. 8 and 9.

Fig. 8 is a block diagram of some embodiments of a base station of the present disclosure. As shown in fig. 8, the base station 80 of this embodiment includes: a memory 810 and a processor 820 coupled to the memory 810, the processor 820 being configured to perform the beam recovery method at the base station side in any of some embodiments of the present disclosure based on instructions stored in the memory 810.

Memory 810 may include, for example, system memory, fixed non-volatile storage media, and the like. The system memory stores, for example, an operating system, an application program, a Boot Loader (Boot Loader), a database, and other programs.

Fig. 9 is a block diagram of further embodiments of a base station of the present disclosure. As shown in fig. 9, the base station 90 of this embodiment includes: the memory 910 and the processor 920 are similar to the memory 810 and the processor 820, respectively. An input output interface 930, a network interface 940, a storage interface 950, and the like may also be included. These

interfaces

930, 940, 950 and the memory 910 and the processor 920 may be connected, for example, by a bus 960. The input/output interface 930 provides a connection interface for input/output devices such as a display, a mouse, a keyboard, and a touch screen. The network interface 940 provides a connection interface for various networking devices, such as a database server or a cloud storage server. The storage interface 950 provides a connection interface for external storage devices such as an SD card and a usb disk.

The terminals in the embodiments of the present disclosure may each be implemented by various computing devices or computer systems, which are described below in conjunction with fig. 10 and 11.

Fig. 10 is a block diagram of some embodiments of the terminal of the present disclosure. As shown in fig. 10, the terminal 100 of this embodiment includes: a memory 1010 and a processor 1020 coupled to the memory 1010, the processor 1020 configured to perform a method of beam recovery at a terminal side in any of the embodiments of the present disclosure based on instructions stored in the memory 1010.

Memory 1010 may include, for example, system memory, fixed non-volatile storage media, and the like. The system memory stores, for example, an operating system, an application program, a Boot Loader (Boot Loader), a database, and other programs.

Fig. 11 is a block diagram of further embodiments of the terminal of the present disclosure. As shown in fig. 11, the terminal 110 of this embodiment includes: the memory 1110 and the processor 1120 are similar to the memory 1010 and the processor 1020, respectively. Input-output interfaces 1130, network interfaces 1140, storage interfaces 1150, etc. may also be included. These

interfaces

1130, 1140, 1150 and the memory 1110 and the processor 1120 may be connected via a bus 1160, for example. The input/output interface 1130 provides a connection interface for input/output devices such as a display, a mouse, a keyboard, and a touch screen. The network interface 1140 provides a connection interface for various networked devices, such as may connect to a database server or a cloud storage server, etc. The storage interface 1150 provides a connection interface for external storage devices such as an SD card and a usb disk.

The present disclosure also provides a beam recovery system, described below in conjunction with fig. 12.

Fig. 12 is a block diagram of some embodiments of the disclosed beam recovery system. As shown in fig. 12, the system 12 of this embodiment includes: a base station 50/60/80/90 in any of the preceding embodiments, and a terminal 70/100/110 in any of the preceding embodiments.

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

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

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

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

The above description is only exemplary of the present disclosure and is not intended to limit the present disclosure, so that any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.

Claims

1. A method of beam recovery, comprising:

a base station receives a quick wave beam failure recovery request sent by a terminal, wherein the quick wave beam failure recovery request carries a failed transmitted wave beam identifier;

the base station determines candidate transmitting wave beams to be switched from a pre-established candidate transmitting wave beam set according to a preset switching rule;

the base station switches the downlink information which is sent to the terminal through the failed transmitting wave beam to the transmitting candidate wave beam to be switched for transmitting;

the set of candidate transmit beams comprises: candidate transmit beams and priorities corresponding to the candidate transmit beams;

the base station determines candidate transmitting beams to be switched from a pre-established candidate beam set according to a preset switching rule, wherein the candidate transmitting beams to be switched comprise:

the base station selects candidate transmitting beams with the priority lower than the failed transmitting beams from a pre-established candidate transmitting beam set according to the switching sequence of the priorities of the candidate transmitting beams from high to low, and determines the candidate transmitting beams to be switched;

the candidate transmitting beam set is determined by the base station in response to a beam reporting message of the terminal in the latest beam scanning process, wherein the beam reporting message comprises the identification of the candidate beam and the corresponding signal quality information;

the priority corresponding to the candidate transmitting beam is determined by the base station according to the signal quality information of the candidate transmitting beam.

2. The beam recovery method of claim 1, wherein the base station determines the candidate transmit beam to be switched from a pre-established candidate transmit beam set according to a preset switching rule, comprising:

the base station judges whether the times of the terminal sending the rapid wave beam failure recovery request reach preset times or not;

and the base station determines the candidate transmitting wave beam to be switched from the pre-established candidate transmitting wave beam set according to a preset switching rule under the condition that the frequency of the terminal sending the quick wave beam failure recovery request is less than the preset frequency.

3. The beam recovery method of claim 2, further comprising:

and the base station sends a downlink beam scanning instruction to the terminal under the condition that the frequency of the rapid beam failure recovery request sent by the terminal reaches a preset frequency, so as to carry out beam switching according to the transmitted beam obtained by beam scanning.

4. The beam recovery method of any of claims 1-3, further comprising:

the base station determines whether to start a rapid beam failure recovery function according to the data transmission requirement of the current terminal and informs the terminal;

the base station receiving the fast beam failure recovery request sent by the terminal comprises:

and under the condition that the rapid wave beam failure recovery function is started, the base station receives a rapid wave beam failure recovery request sent by a terminal.

5. The beam recovery method of any of claims 1-3, further comprising:

the base station receives a quick wave beam failure recovery function starting request or a quick wave beam failure recovery function closing request sent by the terminal;

6. A method of beam recovery, comprising:

a terminal sends a fast wave beam failure recovery request to a base station, wherein the fast wave beam failure recovery request carries a failed transmitted wave beam identifier;

the terminal determines candidate transmitting beams to be switched from a pre-established candidate transmitting beam set according to a preset switching rule;

the terminal receives downlink information originally sent by the base station through the failed transmitting wave beam through the candidate transmitting wave beam to be switched;

the pre-established set of candidate transmit beams comprises: candidate transmit beams and priorities corresponding to the candidate transmit beams;

the terminal determines candidate transmitting beams to be switched from a pre-established candidate transmitting beam set according to a preset switching rule, wherein the candidate transmitting beams to be switched comprise:

the terminal selects a candidate transmitting beam with the priority lower than the failed transmitting beam from a pre-established candidate transmitting beam set according to the switching sequence of the priorities of the candidate transmitting beams from high to low, and determines the candidate transmitting beam to be switched;

the candidate transmitting beam set is determined by the terminal according to a beam reporting message sent to the base station in the latest beam scanning process, wherein the beam reporting message comprises the identification of the candidate beam and the corresponding signal quality information;

the priority corresponding to the candidate transmitting beam is determined by the terminal according to the signal quality information of the candidate transmitting beam.

7. The beam recovery method according to claim 6, wherein the terminal determines the candidate transmit beam to be switched from the pre-established candidate transmit beam set according to a preset switching rule, including:

and the terminal determines the candidate transmitting wave beams to be switched from the pre-established candidate transmitting wave beam set according to a preset switching rule under the condition that the terminal does not receive the downlink wave beam scanning instruction sent by the base station.

8. The beam recovery method of claim 7, further comprising:

the terminal executes a beam scanning process under the condition of receiving a downlink beam scanning instruction sent by the base station so as to switch beams according to the emitted beams obtained by beam scanning;

wherein the downlink beam scanning instruction is sent by the base station when the base station judges that the number of times of sending the fast beam failure recovery request by the terminal reaches a preset number of times.

9. The beam recovery method according to any one of claims 6-8,

the terminal sending the fast beam failure recovery request to the base station comprises the following steps:

under the condition that the rapid wave beam failure recovery function is started, the terminal sends a rapid wave beam failure recovery request to a base station;

the fast beam failure recovery function is that the base station determines whether to start and informs the terminal according to the data transmission requirement of the current terminal.

10. The beam recovery method of any of claims 6-8, further comprising:

the terminal sends a quick wave beam failure recovery function starting request to the base station and receives a quick wave beam failure recovery function starting response sent by the base station;

and the quick beam failure recovery function is that the base station determines whether to be started according to the data transmission requirement of the current terminal.

11. A base station, comprising:

the receiver is used for receiving a fast beam failure recovery request sent by a terminal, wherein the fast beam failure recovery request carries a failed transmitted beam identifier;

the beam selection module is used for determining candidate transmitting beams to be switched from a pre-established candidate transmitting beam set according to a preset switching rule;

the transmitter is used for switching the downlink information which passes through the failed transmitting wave beam to the transmitting candidate wave beam to be switched to transmit;

the beam selection module is used for selecting a candidate transmitting beam with a priority lower than the failed transmitting beam from a pre-established candidate transmitting beam set according to the switching sequence of the priorities of the candidate transmitting beams from high to low, and determining the candidate transmitting beam to be switched;

12. The base station of claim 11, further comprising:

and the request frequency judging module is used for judging whether the frequency of the terminal for sending the rapid beam failure recovery request reaches a preset frequency, and under the condition that the frequency of the terminal for sending the rapid beam failure recovery request is less than the preset frequency, the beam selecting module is triggered to determine the candidate transmitting beam to be switched from a preset candidate transmitting beam set according to a preset switching rule.

13. The base station of claim 12, wherein,

the request frequency judging module is used for informing the transmitter when the frequency of the terminal sending the rapid beam failure recovery request reaches a preset frequency;

the transmitter is configured to send a downlink beam scanning instruction to the terminal, so as to perform beam switching according to a transmission beam obtained by beam scanning.

14. The base station according to any of claims 11-13, further comprising:

the first function starting module is used for determining whether to start a rapid beam failure recovery function according to the data transmission requirement of the current terminal and informing the terminal;

the receiver is configured to receive a fast beam failure recovery request sent by a terminal when the fast beam failure recovery function is turned on.

15. The base station of any of claims 11-13,

the receiver is further configured to receive a fast beam failure recovery function on request or a fast beam failure recovery function off request sent by the terminal;

the base station further comprises:

the second function starting module is used for determining whether to start the rapid beam failure recovery function according to the data transmission requirement of the current terminal and informing the terminal;

16. A terminal, comprising:

a transmitter, configured to send a fast beam failure recovery request to a base station, where the fast beam failure recovery request carries a failed transmit beam identifier;

the receiver is used for receiving the downlink information originally sent by the base station through the failed transmitting wave beam through the candidate transmitting wave beam to be switched;

17. The terminal of claim 16, wherein,

and under the condition that the receiver does not receive a downlink beam scanning instruction sent by the base station, the beam selection module is used for determining candidate transmitting beams to be switched from a pre-established candidate transmitting beam set according to a preset switching rule.

18. The terminal of claim 17, further comprising:

a beam scanning module, configured to execute a beam scanning process when the receiver receives a downlink beam scanning instruction sent by the base station, so as to perform beam switching according to a transmission beam obtained by beam scanning;

19. The terminal of any one of claims 16-18,

the transmitter is configured to send a fast beam failure recovery request to a base station when the fast beam failure recovery function is turned on;

20. The terminal of any one of claims 16-18,

the transmitter is further configured to send a fast beam failure recovery function start request to the base station, and send the fast beam failure recovery request to the base station when the fast beam failure recovery function is started;

the receiver is further configured to receive a fast beam failure recovery function start response sent by the base station;

21. A base station, comprising:

a memory; and

a processor coupled to the memory, the processor configured to perform the beam recovery method of any of claims 1-5 based on instructions stored in the memory device.

22. A terminal, comprising:

a memory; and

a processor coupled to the memory, the processor configured to perform the beam recovery method of any of claims 6-10 based on instructions stored in the memory device.

23. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 10.

24. A beam recovery system comprising: the base station of any of claims 11-15, 21 and the terminal of any of claims 16-20, 22.