Patent Description:
The 5th generation mobile communication (<NUM>) system is also known as the new radio (NR) system, which introduces beamforming as one of its key technologies.

Beamforming refers to the formation of specific spatial directivity by superimposing signals transmitted by multiple antennas by assigning specific weights to these antennas. In a <NUM> system, a sending device can send beam signals to multiple receiving devices simultaneously through different beams, thereby realizing reuse of the same time-frequency resources in different spaces (i.e., space division multiplexing), greatly increasing system capacity.

Accordingly, in a <NUM> system, a receiving device may simultaneously detect multiple beams sent by the sending device, and before receiving the data sent by the sending device, the receiving device needs to separately perform measurements on the multiple beams sent by the sending device to identify the beam with good signal quality among the multiple beams for the receiving, and the process of performing measurements on multiple beams sent by the sending device separately requires more measurement time, resulting in high complexity and latency of data reception.

<CIT> discloses an apparatus and method for selecting the best beam in a wireless communication system. An operation of a Base Station (BS) includes repeatedly transmitting reference signals beamformed with a first width, receiving a feedback signal indicating at least one preferred-beam having the first width from at least one terminal, determining a direction range within which reference signals beamformed with a second width are to be transmitted and a transmission pattern, based on the at least one preferred-beam having the first width, repeatedly transmitting the reference signals beamformed with the second width within the determined direction range according to the transmission pattern, and receiving a feedback signal indicating at least one preferred-beam having the second width from the at least one terminal.

<CIT> discloses a method of beam misalignment detection for wireless communication system with beamforming is proposed. To identify a misaligned beam, a relative beam quality degradation is applied by comparing a dedicated beam quality with a reference beam quality. The reference beam favors similar transmission path as the dedicated beam, and has better mobility robustness. In one embodiment, the reference beam is an associated control beam of the dedicated beam. To detect beam misalignment, a first dedicated beam SINR is compared with a second associated control beam SINR.

Embodiments of the present invention provide a beam selection method, device and system for solving the problem that the receiving device separately performing measurements on the multiple beams sent by the sending device requires a large amount of measurement time, resulting in high complexity and latency of data reception. The technical solution is as follows.

According to a first aspect of the embodiments of the present invention, a beam selection method is provided, the method including:.

In an optional embodiment, the association relation between the first beam and the at least one second beam further includes at least one of:
an association relation between a beam ID of the first beam and a beam ID of the at least one second beam; an association relation between a physical resource associated with the first beam and a physical resource associated with each of the at least one second beam; and an association relation between a reference signal associated with the first beam and a reference signal associated with each of the at least one second beam.

In an optional embodiment, the reference signal associated with the first beam and the reference signal associated with each of the at least one second beam includes:
a Demodulation Reference Signal (DMRS) used by a downlink physical channel of an associated beam transmission.

In an optional embodiment, the receiving, by a receiving device, at least one set of beam associating information sent by a sending device, includes: receiving, by the receiving device, the at least one set of beam associating information sent by the sending device through dedicated signaling or broadcast signaling.

In an optional embodiment, the receiving device is an access network device, and the sending device is a terminal.

According to a second aspect of the embodiments of the present invention, a beam selection method is provided, the method including:.

In an optional embodiment, the sending, by the sending device, the at least one set of beam information to the receiving device, includes:
Sending, by the sending device, the at least one set of beam associating information to the receiving device through dedicated signaling or broadcast signaling.

According to a fifth aspect of the embodiments of the present invention, a beam selection apparatus is provided, the beam selection apparatus includes at least one unit, wherein the at least one unit is configured to implement the beam selection method provided by the first aspect or any of the optional implementations of the first aspect.

According to a sixth aspect of the embodiments of the present invention, a beam selection apparatus is provided, the beam selection apparatus includes at least one unit, wherein the at least one unit is configured to implement the beam selection method provided by the second aspect or any of the optional implementations of the second aspect.

The beneficial effects of the technical solutions provided by the embodiments of the present invention are:
the sending device sends the association relation between the first beam and the second beam to the receiving device, and the receiving device, in the process of receiving the data sent by the sending device, may quickly selects, according to the association relation between the first beam and the second beam sent by the sending device, a beam to be received among beams sent by the sending device, so that the step or times for measuring the signal quality of beams during data receiving process are reduced, thereby reducing the time spent on measuring beams, accelerating the process of beam measurement and selection of the receiving device, simplifying the complexity of data receiving, and lowering the latency of data receiving.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention, other drawings may also be obtained by those of ordinary skill in the art without any creative work according to these drawings.

In order to make the objectives, technical schemes and advantages of the present invention more clear, implementations of the present invention will be further described in detail below with reference to the accompanying drawings.

A "module" as used herein generally refers to a program or instruction stored in a memory and is capable of performing particular functions; "unit" as used herein generally refers to a functional structure that is logically divided, the "unit" can be implemented by hardware alone or a combination of hardware and software.

"Multiple" as used herein means two or more. "and/or" describes the association relationship of the associated objects, indicating that there may be three relationships, for example, A and/or B, which may indicate that there are three cases: A existing alone, A and B existing together, and B existing alone. The character "/" generally indicates that the contextual object is an "or" relation.

Please refer to <FIG>, which is a schematic structural diagram of a mobile communication system according to an embodiment of the present invention. The mobile communication system can be a <NUM> system, also known as an NR system. The mobile communication system includes an access network device <NUM> and a terminal <NUM>.

The access network device <NUM> may be a base station. For example, the base station may be a base station (gNB) adopting a centralized distributed architecture in a <NUM> system. When the access network device <NUM> adopts a centralized distributed architecture, it generally includes a central unit (CU) and at least two distributed units (DUs). The central unit is provided with a Packet Data Convergence Protocol (PDCP) layer, a Radio Link Control (RLC) layer, and a Media Access Control (MAC) layer protocol stack; and the distributed unit is provided with a physical (PHY) layer protocol stack. The specific implementation manner of the access network device <NUM> is not limited in the embodiment of the present invention.

The access network device <NUM> and the terminal <NUM> establish a wireless connection through a wireless air interface. In an embodiment, the wireless air interface is a wireless air interface based on the fifth generation mobile communication network technology (<NUM>) standard. For example, the wireless air interface may be a new radio (NR); or the wireless air interface may alternatively be a wireless air interface based on the next generation of <NUM> mobile communication network technology standards.

The terminal <NUM> may be a device that provides voice and/or data connectivity to a user. The terminal can communicate with one or more core networks via a Radio Access Network (RAN). The terminal <NUM> can be a mobile terminal, such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal. For example, it can be a portable, pocket, handheld, computer built-in or in-vehicle mobile device, e.g., a subscriber unit, a subscriber station, a mobile station, a mobile, a remote station, an access point, a remote terminal, an access terminal, a user terminal, a user agent, a user device, or user equipment.

It should be noted that, in the mobile communication system shown in <FIG>, a plurality of access network devices <NUM> and/or a plurality of terminals <NUM> may be included, and one access network device <NUM> and one terminal <NUM> are shown in <FIG> as an example, but this embodiment is not limited thereto.

In a <NUM> system, a sending device can send data to a receiving device in a specific direction through a beam. The sending device may be the access network device <NUM> in the mobile communication system as shown in <FIG>, and the receiving device may be the terminal <NUM>. In this instance, the beam sent by the sending device to the receiving device may be referred to as a downlink beam. Or, the sending device may be the terminal <NUM> in the mobile communication system as shown in <FIG> above, and the receiving device may be the access network device <NUM>. In this instance, the beam sent by the sending device to the receiving device may be referred to as an uplink beam.

The width of different beams sent by the sending device can be different. For example, in the embodiment of the present invention, the beam sent by the sending device may be categorized into two types: a first beam and a second beam. In an embodiment, one first beam may cover at least one second beam.

In a scheme of the present invention, a first beam covers at least one second beam, that is, the first beam spatially covers at least one second beam, or the coverage of the at least one second beam is within the coverage of the first beam. In some scenarios, the first beam may be referred to as a wide beam, the second beam may be referred to as a narrow beam, or the first beam may be referred to as a large beam, and the second beam may be referred to as a small beam. The specific naming of the first beam and the second beam is not limited in the embodiment of the present invention.

Different types of beams can transmit different physical channels. For example, the second beam can be used to transmit a data channel, so that the number of beams used for transmitting the data channel is larger, enabling more effective space division multiplexing while expanding system capacity. The first beam can be used to transmit a common channel or control channel to increase the coverage of the common channel or control channel. Of course, the embodiments of the present invention do not limit the physical channels to be transmitted by various types of beams. For example, in practical applications, the first beam may also be used to transmit a data channel, and the second beam may also be used to transmit a common channel or a control channel. In another possible implementation manner, the foregoing first beam may also not correspond to a specific physical channel.

Specifically, please refer to <FIG>, which shows a schematic diagram of a beam provided by an embodiment of the present invention. As shown in <FIG>, the sending device sends six beams, which are beam <NUM> to beam <NUM>, respectively, where beam <NUM> to beam <NUM> are second beams, that is, narrow beams, and beam <NUM> and beam <NUM> are first beams, that is, wide beams. Also, beam <NUM> covers beam <NUM> and beam <NUM>, and beam <NUM> covers beam <NUM> and beam <NUM>. The sending device can send data of the data channel through the beam <NUM> to the beam <NUM>, and send the data of the control channel through the beam <NUM> and the beam <NUM>.

The schematic diagram shown in <FIG> is an example in which the sending device sends six beams and one first beam covers two second beams. In practical applications, the number of beams sent by the sending device is not limited to six, and the number of second beams covered by one first beam is not limited to two, that is, the number of beams sent by the sending device may be more or less, and the number of second beams covered by one first beam may also be more or less. For example, please refer to <FIG>, which is a schematic diagram of a beam according to an embodiment of the present invention. As shown in <FIG>, the sending device sends <NUM> beams, which are beam <NUM> to beam <NUM>, and beam <NUM> to beam <NUM> are second beams, that is, narrow beams, while beam <NUM> to the beam <NUM> are first beams, that is, wide beams. Also, beam <NUM> covers beam <NUM> to beam <NUM>, beam <NUM> covers beam <NUM> to beam <NUM>, and beam <NUM> covers beam <NUM> to beam <NUM>.

Please refer to <FIG>, which shows a flowchart of a beam selection method according to an embodiment of the present invention. This embodiment is exemplified by applying the beam selection method to the mobile communication system shown in <FIG>. The method includes:
Step <NUM>:a sending device generates at least one set of beam associating information, where each set of the beam associating information includes an association relation between a first beam and at least one second beam.

The first beam and the second beam may be beams sent by the sending device, and the first beam covers the associated at least one second beam.

In an embodiment, when generating the beam associating information, the sending device generates beam associating information according to the coverage relation between the first beam and the second beam that is sent by the sending device, that is, generates the association relation between the first beam and at least one second beam covered by the first beam.

For example, taking <FIG> as an illustration, where beam <NUM> covers beam <NUM> and beam <NUM>, beam <NUM> covers beam <NUM> and beam <NUM>, and the sending device can generate an association relation between beam <NUM> and beam <NUM> and beam <NUM> as one set of beam associating information, and another association relation between beam <NUM> and beam <NUM> and beam <NUM> as another set of beam associating information.

Or, taking <FIG> as an example, where beam <NUM> covers beam <NUM> to beam <NUM>, beam <NUM> covers beam <NUM> to beam <NUM>, and beam <NUM> covers beam <NUM> to beam <NUM>, and the sending device can generate an association relation between beam <NUM> and beam <NUM> and beam <NUM> as a set of beam associating information, an association relation between beam <NUM> and beam <NUM> to beam <NUM> as another set of beam associating information, and an association relation between beam <NUM> and beam <NUM> to beam <NUM> as yet another set of beam associating information.

In the embodiment of the present invention, the association relation between the first beam and the at least one second beam in the set of beam associating information may be a explicit association relation or an implicit association relation.

The explicit association may be an association relation between the beam IDs of the first beam and the at least one second beam.

Or, the implicit association relation may be an association relation between a physical resource associated with the first beam and physical resources associated with each of the at least one second beam. The physical resource may be at least one of a time domain resource, a frequency domain resource, and a code domain resource.

And/or, the implicit association relation may be an association relation between a reference signal associated with the first beam and reference signals associated with each of the at least one second beam.

And/or, the implicit association relation may be an association between a physical resource associated with the first beam and a reference signal associated with each of the at least one second beam.

And/or, the implicit association relation may be an association between a reference signal associated with the first beam and a physical resource associated with each of the at least one second beam.

Of course, in a practical application, an association relation between the first beam and the at least one second beam in a set of beam associating information may simultaneously include the explicit association relation and the implicit association relation. In other words, for a set of association relation, indications may be made in a form including both explicit and implicit association relations.

In an embodiment of the present invention, when the first beam and the second beam are used to transmit different physical channels, the association relation between the first beam and the at least one second beam may include a first physical channel associated with the at least one second beam, and a second physical channel associated with the first beam.

Specifically, the association relation between the first beam and the at least one second beam includes: an identifier of the first physical channel associated with the at least one second beam, and an identifier of the second physical channel associated with the first beam.

Or, the association relation between the first beam and the at least one second beam includes: a channel type of the first physical channel associated with the at least one second beam, and a channel type of the second physical channel associated with the first beam.

For example, the second beam is used to transmit a data channel, and the first beam is used to transmit a control channel. When the first beam and the second beam are downlink beams, for example, the sending device is an access network device and the receiving device is a terminal, the first physical channel is a downlink data channel, and the second physical channel is a downlink control channel. Accordingly, when the first beam and the second beam are uplink beams, for example, the sending device is a terminal and the receiving device is an access network device, the first physical channel is an uplink data channel, and the second physical channel is an uplink control channel, and the sending device indicates, by the beam associating information, that the physical channel is associated with the first beam and the physical channel is associated with the second beam to the receiving device.

In an embodiment, when the first beam and the second beam are uplink beams, the reference signals used in the implicit association relation include: DMRS used by uplink physical channels of associated beam transmissions, and/or SRS used by the uplink physical channel of associated beam transmissions.

Or, when the first beam and the second beam are downlink beams, the reference signal used in the implicit association relation includes: DMRS used by a downlink physical channel of associated beam transmissions, and/or beam specific RS of associated beams, and/or CSI-RS of associated beams.

In practical applications, the reference signals used in the implicit association relation are not limited to the above four, i.e., DMRS, SRS, beam specific RS, and CSI-RS. The sending device may also select other reference signals according to actual usage scenarios to indicate the association relation between the first beam and the second beam. Meanwhile, these reference signals can also be replaced by other reference signals serving the same or similar pilot functions but having different names.

Step <NUM>: the sending device sends at least one set of beam associating information to the receiving device.

In an embodiment, the sending device sends the at least one set of beam associating information through dedicated signaling or broadcast signaling. For example, when the sending device is an access network device, the sending device may send the at least one set of beam associating information through dedicated signaling or broadcast signaling; when the sending device is a terminal, the sending device may send the at least one set of beam associating information through dedicated signaling.

The dedicated signaling may be Radio Resource Control (RRC) signaling, etc., and the broadcast signaling may be system information broadcasting, etc..

Step <NUM>: the receiving device receives at least one set of beam associating information sent by the sending device.

Accordingly, the receiving device receives the at least one set of beam associating information sent by the sending device through dedicated signaling or broadcast signaling. For example, when the sending device is an access network device, the receiving device may receive the at least one set of beam associating information through dedicated signaling or broadcast signaling; when the sending device is a terminal, the receiving device may receive the at least one set of beam associating information through dedicated signaling.

Step <NUM>: the receiving device selects a beam to be received among beams sent by the sending device according to the at least one set of beam associating information.

In the embodiment of the present invention, receiving a beam may mean receiving data or signaling in a physical channel transmitted through the beam. Accordingly, receiving a channel, as will be described in the following, may mean receiving data or a signaling in that channel.

In the embodiment of the present invention, the scenario of the receiving device selecting a beam to be received among beams sent by the sending device according to the at least one set of beam associating information may include, but not limited to, the following three cases.

In a first case, when the receiving device receives a first physical channel through a second beam, a first beam associated with the second beam may be selected as a beam for receiving the second physical channel according to the at least one set of beam associating information.

For example, the first beam is used for transmitting a control channel, and the second beam is used for transmitting a data channel. When the receiving device is receiving the data channel through a second beam, if the receiving device needs to receive the control channel, it can quickly select the first beam associated with the second beam according to the received beam associating information, and does not need to separately measure each first beam sent by the sending device, thereby reducing the steps of measurements on the signal quality of the beams during data receiving process.

In a second case, when the second physical channel is being received through the first beam, the receiving device measures the signal quality of the at least one second beam associated with the first beam according to the at least one set of beam associating information, and selects the second beam with the beat signal quality in the at least one second beam associated with the first beam as the beam for receiving the first physical channel.

For example, the first beam is used for transmitting the control channel, and the second beam is used for transmitting the data channel. When the receiving device is receiving the control channel through the first beam, if the receiving device needs to receive the data channel, it may determine a part of the second beam associated with the first beam according to the received beam associating information, and select a second beam with the optimal signal quality from the determined part of second beam for receiving the data channel, without any need to measure all the second beams sent by the sending device separately, thereby reducing the number of measurements to be performed on the signal quality of the beam during data reception.

In a third case, when the at least one set of beam associating information includes at least two sets of beam associating information, the receiving device measures signal quality of the first beam of each of the at least two sets of beam associating information, and then measures the signal quality of the at least one second beam associated with the first beam with the optimal signal quality among the first beam of each of the at least two sets of beam associating information, and selects the second beam with the optimal signal quality among the at least one second beam associated with the first beam as the received beam.

Through the above method, when the sending device sends multiple second beams in the direction in which the receiving device is located, the receiving device does not need to perform signal quality measurement on each of the multiple second beams. Rather, it only need to perform measurement on the first beam covering the multiple second beams, find a first beam with the optimal signal quality, and at least one second beam covered by the first beam with the optimal signal quality can be taken as the set of second beams with the optimal signal quality. The receiving device then performs measurement on the set of second beams with the optimal signal quality and selects the second beam with the optimal signal quality. Compared with performing measurement of the signal quality for each of the second beams separately, the present solution can reduce the number of measurements performed about the signal quality of the beam during data reception process.

In summary, in the beam selection method shown in the embodiment of the present invention, the sending device sends the association relation between the first beam and the second beam to the receiving device, and the receiving device may, while receiving the data sent by the sending device, quickly select according to the association relation between the first beam and the second beam sent by the sending device, a beam to be received among beams sent by the sending device, so that the steps or number for measuring the signal quality of beams during data receiving process are reduced, thereby reducing the time spent on performing measurements on the beams, accelerating the process of beam measurement and selection of the receiving device, simplifying the complexity of data receiving, and lowering the latency of data receiving.

It should be noted that the steps performed by the receiving device in the embodiment shown in <FIG> may be separately implemented as a beam selecting method on the receiving device side, and the steps performed by the sending device in the foregoing embodiments may be separately implemented as a beam selection method on the sending device side.

Please refer to <FIG>, which is a flowchart of a beam selection method according to an embodiment of the present invention. In this embodiment, as an example for illustration, the beam selection method is applied to the mobile communication system shown in <FIG>, the sending device is an access network device, the receiving device is a terminal, and the access network device sends a downlink data channel through a second beam, and sends a downlink control channel through a first channel. The method includes:
Step <NUM>: the access network device generates at least one set of beam associating information, where each set of beam associating information includes an association relation between a first beam and at least one second beam.

In an embodiment of the present invention, the association relation between the first beam and the at least one second beam further includes at least one downlink data channel associated with the second beam, and a downlink control channel associated with the first beam.

Or, the association relation between the first beam and the at least one second beam may also include an identifier or a channel type of the uplink physical channel associated with the at least one second beam, and/or an identifier or a channel type of the uplink physical channel associated with the first beam.

Step <NUM>: the access network device sends at least one set of beam associating information to the terminal.

In an embodiment, the access network device may send the at least one set of beam associating information through dedicated signaling or broadcast signaling.

Step <NUM>: the terminal receives the at least one set of beam associating information sent by the access network device.

Accordingly, the terminal may receive the at least one set of beam associating information through dedicated signaling or broadcast signaling.

Step <NUM>: the terminal selects the first beam associated with the second beam as a beam for receiving the downlink control channel when the downlink data channel is received through the second beam.

For example, a beam sent by the access network device may be as shown in <FIG>, and the access network device transmits the downlink data channel through the second beam (beam <NUM> to beam <NUM>) and transmits the downlink control channel through the first beam (beam <NUM> and beam <NUM>). When the terminal is receiving the downlink data channel through beam <NUM>, if the terminal needs to receive the downlink control channel, it does not have to separately perform measurements on beam <NUM> and beam <NUM>. Rather, it may directly select a first beam associated with beam <NUM>, i.e., beam <NUM>, according to the received beam associating information, and receive the downlink control channel through beam <NUM>.

In summary, in the beam selection method provided by the embodiment of the present invention, the access network device transmits the downlink data channel through the second beam, transmits the downlink control channel through the first beam, and notifies the terminal the association relation between the first beam and the second sent by the access network device, when the terminal receives the downlink data channel transmitted by the access network device through the second beam, if the downlink control channel needs to be received, the terminal may receive the downlink control channel directly through the first beam associated with the second beam according to the association relation between the first beam and the second beam, without having to perform measurements on each first beam sent by the access network device, thereby reducing the steps of measuring the signal quality of the beam during the process of receiving the downlink control channel.

In an alternative embodiment based on <FIG>, the terminal may also select a second beam for receiving the downlink data channel through an association relation between the first beam and the second beam sent by the access network device. In this instance, Step <NUM> can alternatively be implemented as step 504a and step 504b, as shown in <FIG>.

Step 504a: the terminal performs measurement about signal quality of the at least one second beam associated with the first beam according to the at least one set of beam associating information when the downlink control channel is received through the first beam.

For example, the beam sent by the access network device is as shown in <FIG>, and the access network device transmits the downlink data channel through the second beam (beam <NUM> to beam <NUM>) and transmits the downlink control channel through the first beam (beam <NUM> and beam <NUM>). When the terminal is receiving the downlink control channel through beam <NUM>, if the terminal needs to receive the downlink data channel, it may select the second beam (beam <NUM> and beam <NUM>) associated with beam <NUM> to perform measurement about signal quality according to the received beam associating information, without having to measure the signal quality of beam <NUM> and beam <NUM>, separately.

Step 504b: the terminal selects the second beam with the optimal signal quality among the at least one second beam associated with the first beam as the beam for receiving the downlink data channel.

For example, after performing measurements about the signal quality on beam <NUM> and beam <NUM>, respectively, the terminal selects the beam with the optimal signal quality among beam <NUM> and beam <NUM> to receive the downlink data channel.

In summary, in the beam selection method provided by the embodiment of the present invention, the access network device transmits the downlink data channel through the second beam, transmits the downlink control channel through the first beam, and notifies the terminal the association relation between the first beam and the second beam sent by the access network device. When the terminal receives the downlink data channel transmitted by the access network device through the first beam, if a downlink control channel needs to be received, the terminal only have to perform measurement on the second beam associated with the first beam according to the association relation between the first beam and the second beam, rather than all the second beam sent by the access network device, thereby reducing the number of measurements to be performed about the signal quality of the beam during the process of receiving the downlink control channel.

Please refer to <FIG>, which is a flowchart of a beam selection method according to an embodiment of the present invention. In this embodiment, the beam selection method is applied to the mobile communication system shown in <FIG>, where the sending device is an access network device, and the receiving device is a terminal. The method includes:
Step <NUM>: the access network device generates at least two sets of beam associating information, each set of beam associating information including an association relation between a first beam and at least one second beam.

In the embodiment of the present invention, the first beam does not have to be any specific downlink physical channel. For example, the different downlink physical channel can be transmitted through any of the first beam or the second beam.

Or, similar to the embodiment shown in <FIG> or <FIG>, in the embodiment of the present invention, the first beam and the second beam may also be used to transmit different downlink physical channels, respectively.

Step <NUM>: the access network device sends the generated at least two sets of beam associating information to the terminal.

Step <NUM>: the terminal receives the at least two sets of beam information sent by the sending device.

Step <NUM>: the terminal performs measurement about signal quality of each first beam of each of the at least two sets of beam associating information.

For example, the beam sent by the access network device is as shown in <FIG>, and the access network device sends nine second beams, i.e., beam <NUM> to beam <NUM>. When the terminal needs to receive the signaling or data sent by the access network device through a second beam, the second beam with the optimal signal quality needs to be selected from beam <NUM> to beam <NUM>. In the solution shown in the embodiment of the present invention, after receiving the beam associating information sent by the access network device, the terminal may firstly perform measurements on the three first beams associated with the nine second beams when selecting the received second beam, i.e., perform measurements about the signal quality of beam <NUM>, beam <NUM> and beam <NUM> in <FIG>.

Step <NUM>: the terminal performs measurement about signal quality of at least one second beam associated with the first beam with the optimal signal quality in the first beam of each of the two sets of beam associating information.

After measuring the signal quality of beam <NUM>, beam <NUM> and beam <NUM> in <FIG>, the terminal determines the first beam with the optimal signal quality. For example, assuming that the first beam with the optimal signal quality is the beam <NUM>, further, the terminal performs signal quality measurement on the three second beams (i.e., beam <NUM> to beam <NUM>) associated with beam <NUM>.

Step <NUM>: the terminal selects, among the at least one second beam associated with the first beam with the optimal signal quality, the second beam with the optimal signal quality as a beam to be received.

Specifically, the terminal may select, in the at least one second beam associated with the first beam with the optimal signal quality, the second beam with the optimal signal quality as a beam for receiving data or signaling sent by the access network device.

For example, after measuring the signal quality of the second beam associated with the first beam with the optimal signal quality (i.e., beam <NUM> to beam <NUM> in <FIG>), the terminal may select the beam with the optimal signal quality in the received beam <NUM> to beam <NUM>, and receives data or signaling sent by the access network device through the selected beam.

For example, taking the beam associating information including the association relation between the reference signal of the first beam and the reference signal of each of the associating second beam as an example, the terminal may measure the signal quality of beam <NUM>, beam <NUM> and beam <NUM> according to the reference signals of beam <NUM>, beam <NUM> and beam <NUM>. After determining that beam <NUM> has the optimal signal quality among the three beams, a query may be performed to obtain the association relation between the reference signal of beam <NUM> and the reference signal of beam <NUM> to beam <NUM>, According to the reference signals of beam <NUM> to beam <NUM>, the signal quality of beam <NUM> to beam <NUM> is measured, and the second beam with the optimal signal quality is selected therefrom.

In the above process of the embodiment of the present invention, when selecting a second beam from the nine second beams shown in <FIG>, the terminal only needs to measure the three first beams first, and then measure the signal quality of the three second beams associated with the first beam with the optimal signal quality, and can determine the received second beam through six measurements before and after without measuring the nine second beams separately.

In summary, in the beam selection method provided by the embodiment of the present invention, the access network device notifies the terminal of the association relation between the first beam and the second beam sent by the access network device; when selecting a second beam from the second beams sent by the access network device for receiving, the terminal only needs to perform measurements on individual first beams sent by the access network device and then on the second beam associated with the first beam with the optimal signal quality to determine the second beam to be received, without having to separately perform measurements on all the second beams sent by the access network device, thereby reducing the number measurements to be performed about the signal quality of the beam during the process of receiving data or signaling through the second beam.

The solution shown in <FIG> is described by way of example illustrating the sending device as the access network device and the receiving device as the terminal. The beam selection method provided by the present invention is also applicable to the case where the access network device selects a beam sent by the terminal.

Please refer to <FIG>, which is a flowchart of a beam selection method according to an embodiment of the present invention. This embodiment will be illustrated by way of example, in which the beam selection method is applied to the mobile communication system as shown in <FIG>, the sending device is a terminal, the receiving device is an access network device, and the terminal sends an uplink data channel through the second beam, and sends an uplink control channel through the first beam. The method includes the following.

Step <NUM>: the terminal generates at least one set of beam associating information, where each set of beam associating information includes an association relation between a first beam and at least one second beam.

In an embodiment of the present invention, the association relation between the first beam and the at least one second beam further includes an uplink data channel associated with the at least one second beam, and an uplink control channel associated with the first beam.

Or, the association relation between the first beam and the at least one second beam may also include an identifier or a channel type of the uplink physical channel associated with the at least one second beam, and an identifier or channel type of the uplink physical channel associated with the first beam.

Step <NUM>: the terminal sends at least one set of beam information to the access network device.

In an embodiment, the terminal sending the at least one set of beam associating information through dedicated signaling, such as RRC signaling.

Step <NUM>: the access network device receives at least one set of beam information sent by the terminal.

Accordingly, the access network device receiving the at least one set of beam associating information sent by the terminal through dedicated signaling.

Step <NUM>: the access network device selects the first beam associated with the second beam as a beam for receiving the uplink control channel when the uplink data channel is received through the second beam.

For example, the beam transmitted by the terminal may be as shown in <FIG>, and the terminal transmits the uplink data channel through the second beam (beam <NUM> to beam <NUM>), and transmits the uplink control channel through the first beam (beam <NUM> and beam <NUM>). When the access network device is receiving the uplink data channel through beam <NUM> (i.e., the second beam), if the access network device needs to receive the uplink control channel, rather than having to measure the beam <NUM> and the beam <NUM> separately, it may go straight to select the first beam (beam <NUM>) associated with beam <NUM> according to the received beam associating information and receive the uplink control channel through beam <NUM>.

In summary, in the beam selection method provided by the embodiment of the present invention, the terminal transmits the uplink data channel through the second beam, transmits the uplink control channel through the first beam, and notifies the access network device of the association relation between the first beam and the second sent by the terminal; when the access network device receives the uplink data channel transmitted by the terminal through the second beam, if the uplink control channel needs to be received, the access network device may directly receive the uplink control channel through the first beam associated with the second beam according to the association relation between the first beam and the second beam, without having to perform measurements on each first beam sent by the access network device, thereby reducing the steps of measuring the signal quality of the beam during the process of receiving the uplink control channel.

In an alternative embodiment based on <FIG>, the terminal may also select a second beam for receiving the downlink data channel through an association relation between the first beam and the second beam sent by the access network device. In this instance, Step <NUM> can alternatively be implemented as Step 804a and Step 804b, as shown in <FIG>:
Step 804a: the access network device performs measurement about signal quality of the at least one second beam associated with the first beam according to the at least one set of beam associating information when the uplink control channel is received through the first beam.

For example, the beam sent by the access network device is as shown in <FIG>, and the terminal transmits the downlink data channel through the second beam (beam <NUM> to beam <NUM>) and transmits the downlink control channel through the first beam (beam <NUM> and beam <NUM>). When the access network device receives the downlink control channel through beam <NUM>, if the downlink data channel needs to be received, the access network device may select the second beam (beam <NUM> and beam <NUM>) associated with beam <NUM> to perform measurement of signal quality according to the received beam associating information, without having to measure the signal quality of beam <NUM> and beam <NUM> separately.

Step 804b: the access network device selects the second beam with the optimal signal quality among the at least one second beam associated with the first beam as the beam for receiving the uplink data channel.

For example, as shown in <FIG>, after performing signal quality measurement on beam <NUM> and beam <NUM>, respectively, the access network device selects to receive the uplink data channel through the beam with the optimal signal quality in beam <NUM> and beam <NUM>.

In summary, in the beam selection method provided by the embodiment of the present invention, the terminal transmits the downlink data channel through the second beam, transmits the downlink control channel through the first beam, and notifies the access network device the association relation between the first beam and the second sent by the terminal; when the access network device receives the uplink data channel transmitted by the terminal through the first beam, if the uplink control channel needs to be received, the access network device can simply perform measurement on the second beam associated with the first beam according to the association relation between the first beam and the second beam, without having to perform measurement on all the second beam sent by the terminal, thereby reducing the number of measurements about the signal quality of the beam during the process of receiving the uplink control channel.

Please refer to <FIG>, which is a flowchart of a beam selection method according to an embodiment of the present invention. In this embodiment, the beam selection method is applied to the mobile communication system as shown in <FIG>, where the sending device is a terminal, and the receiving device is an access network device. The method includes the following.

Step <NUM>: the terminal generates at least two sets of beam associating information, each set of beam associating information including an association relation between a first beam and at least one second beam.

In the embodiment of the present invention, the first beam may not correspond to a specific downlink physical channel. For example, different downlink physical channels can be transmitted through the first beam or the second beam.

Alternatively, similar to the embodiment shown in <FIG> or <FIG>, in the embodiment of the present invention, the first beam and the second beam may also be used to transmit different downlink physical channels, respectively.

Step <NUM>: the terminal sends the generated at least two sets of beam information to the terminal.

In an embodiment, the terminal sending the at least one set of beam associating information through dedicated signaling.

Step <NUM>: the access network device receives the at least two sets of beam information sent by the sending device.

Accordingly, the access network device receiving the at least one set of beam associating information through dedicated signaling.

Step <NUM>: the access network device performs measurement about signal quality of the first beam of each of the at least two sets of beam associating information.

For example, the beam sent by the terminal is as shown in <FIG>, and the terminal transmits the nine second beams of beam <NUM> to beam <NUM>. When the access network device needs to receive the signaling or data sent by the terminal through the second beam, the second beam with the optimal signal quality needs to be selected from beam <NUM> to beam <NUM>. In the solution shown in the embodiment of the present invention, the access network device may first measure the three first beams associated with the nine second beams when selecting the second beam, i.e. measure the signal quality of beam <NUM>, beam <NUM> and beam <NUM> in <FIG>.

Step <NUM>: the access network device performs measurement about signal quality of at least one second beam associated with the first beam with the optimal signal quality in the first beam of each of the two sets of beam associating information.

After measuring the signal quality of beam <NUM>, beam <NUM> and beam <NUM> in <FIG>, the access network device determines the first beam with the optimal signal quality, for example, assuming that the first beam with the optimal signal quality is the beam <NUM>, further, the access network device performs signal quality measurement on the three second beams (i.e., beam <NUM> to beam <NUM>) associated with beam <NUM>.

Step <NUM>: the access network device selects in the at least one second beam associated with the first beam with the optimal signal quality, the second beam with the optimal signal quality as the received beam.

Specifically, the access network device may select, in the at least one second beam associated with the first beam with the optimal signal quality, the second beam with the optimal signal quality as a beam for receiving data or signaling sent by the terminal.

For example, after the access network device measures the signal quality of beam <NUM> to beam <NUM> in <FIG>, the beam with the optimal signal quality in beam <NUM> to beam <NUM> is selected as the beam for receiving data or signaling.

In the above process of the embodiment of the present invention, when selecting a second beam from the nine second beams shown in <FIG>, the access network device only needs to measure the three first beams first, and then measure the signal quality of the three second beams associated with the first beam with the optimal signal quality, and can determine the received second beam through six measurements before and after without measuring the nine second beams separately.

In summary, in the beam selection method provided by the embodiment of the present invention, the terminal notifies the access network device of the association relation between the first beam and the second beam sent by the terminal, when selecting a second beam from the second beams sent by the terminal for receiving, the access network device only needs to measure each of the first beams sent by the terminal, and then measure the second beam associated with the first beam with the optimal signal quality, and determine the received second beam without separately measuring all the second beams sent by the terminal, thereby reducing the number of times of measuring the signal quality of the beam during the process of receiving data or signaling through the second beam.

It should be noted that, in the foregoing embodiments shown in <FIG>, the steps performed by the access network device may be separately implemented as a beam selection method on the access network device side, and the steps performed by the terminal in each of the foregoing embodiments shown in <FIG> may be separately implemented as a beam selection method on the terminal side.

Please refer to <FIG>, which is a flowchart of a method of a beam selection method according to an embodiment of the present invention. This embodiment is exemplified by applying the beam selection method to the mobile communication system shown in <FIG>. The method includes:
Step <NUM>: a sending device generates at least one set of beam associating information, where each set of beam associating information includes an association relation between a beam where a first signal is borne and a beam where a second signal is borne.

In an embodiment, the beam where the first signal is borne is the same beam as the beam where the second signal is borne.

In the embodiment of the present invention, when the sending device performs multi-beam sending by using the beamforming technology, different signals belonging to the same type may be sent on different beams, and multiple signals of different types may be sent on the same beam. The sending device may generate a set of beam associating information according to the first signal and the second signal on each beam sent by the sending device.

For example, taking <FIG> as an example, where beam <NUM> to beam <NUM> each sends a first signal and a second signal, wherein the first signal sent in beam <NUM> is signal <NUM> and the second signal sent in beam <NUM> is <NUM>, the first signal sent in beam <NUM> is signal <NUM>, and the second signal sent in beam <NUM> is <NUM>, the first signal sent in beam <NUM> is signal <NUM>, and the second signal sent in beam <NUM> is <NUM>, the first signal sent in beam <NUM> is signal <NUM> and the second signal sent in beam <NUM> is <NUM>. The set of beam associating information associated with beam <NUM> includes the association relation between the beam where the signal <NUM> is borne and the beam where the signal <NUM> is borne. Accordingly, the set of beam associating information associated with beam <NUM> includes association relation between the beam where the signal <NUM> is borne and the beam where the signal <NUM> is borne, the set of beam associating information associated with beam <NUM> includes the association relation between the beam where the signal <NUM> is borne and the beam where the signal <NUM> is borne, and the set of beam associating information associated with beam <NUM> includes the association relation between the beam where the signal <NUM> is borne and the beam where the signal <NUM> is borne.

The relation between the beam where the first signal is borne and the beam where the second signal is borne may directly be the association relation between the signal content of the first signal and the signal content of the second signal, or may be the association relation between the identifier of the first signal and the identifier of the second signal, or may be the association relation between the signal content of the first signal and the identifier of the second signal, or may be the association relation between the identifier of the first signal and the signal content of the second signal and so on.

Step <NUM>: the sending device sends, at least one set of beam associating information to the receiving device.

In the embodiment of the present invention, the sending device may send the beam associating information through a Quasi Co-Located (QCL) parameter, that is, the sending device sends a Quasi Co-Located parameter indicating the at least one set of beam associating information to the receiving device.

Or,
In the embodiment of the present invention, the sending device may also send the beam associating information through dedicated signaling, that is, the sending device sends the dedicated signaling including the at least one set of beam associating information to the receiving device, such as radio resource control (RRC) signaling.

Step <NUM>: the receiving device receives the at least one set of beam associating information.

Accordingly, when the sending device can send the beam associating information through the Quasi Co-Located parameter, the receiving device receives the Quasi Co-Located parameter sent by the sending device, and obtains at least one set of beam associating information indicated by the Quasi Co-Located parameter.

Or,
When the sending device sends the beam associating information through the dedicated signaling, the receiving device receives at least one set of beam associating information sent by the sending device through the dedicated signaling.

Step <NUM>: the receiving device selects, a beam to be received among beams sent by the sending device according to the at least one set of beam associating information.

Specifically, in the embodiment of the present invention, the receiving device can obtain the signal quality of each beam obtained by performing measurement on the first signal in each beam; the receiving device queries each second signal associated with the first signal in the beam with the optimal signal quality according to at least one set of beam associating information; the receiving device selects the beam with the optimal signal quality as the beam for receiving the second signal associated with the first signal in the beam with the optimal signal quality.

With the method shown in the embodiment of the present invention, the receiving device may perform measurement on the first signal in each beam sent by the sending device to obtain the signal qualities of the respective beams, so as to subsequently directly query to determine which signal is the second signal carried in the beam with the strongest signal according to the received beam associating information while receiving the second signal, thereby receiving the determined second signal directly through the beam with the strongest signal, without beam scanning for the second signal.

In summary, in the method shown in the embodiment of the present invention, when the receiving device needs to receive the second signal after performing measurement on the first signal, the receiving device does not need to measure the second signal, and can directly select the beam for receiving according to the beam associating information, thereby reducing the steps or times of measuring various signals in the beam, thereby reducing the time taken for beam measurement, accelerating the process of beam measurement and selection of the receiving device, and simplifying system complexity, reducing the latency of data reception.

It should be noted that the steps performed by the receiving device in the foregoing embodiment shown in <FIG> may be separately implemented as a beam selection method on the receiving device side, and the steps performed by the sending device in the foregoing embodiments may be separately implemented as a beam selection method on the sending device side.

The <NUM> system can cover the entire cell through different beams, that is, each beam covers a smaller range, and the effect of multiple beams covering the entire cell is realized by sweeping in time. Different sync signal blocks (SS blocks) are transmitted on different beams, and the terminal can distinguish different beams by different SS blocks.

The terminal starts beam sweeping during the process of searching for the cell, and measures different SS blocks to obtain the optimal downlink beam (i.e., the beam with the optimal signal quality). When the terminal is in the idle mode, it also needs to select the beam with the optimal signal quality when listening to the paging channel/signal. When the terminal enters the connected state, the terminal may need to measure CSI-RS, different CSI-RS configurations correspond to different beams; similarly, at other times, the terminal may also need to measure the beam associated with the downlink DMRS. Since the terminal has already measured the SS block when doing the cell selection, the system can indicate the association relation between the SS block and the beams of other signals/channels by the solution shown in <FIG> above, and the beam selection process can be greatly simplified when selecting beams measuring other signals/channels.

Please refer to <FIG>, which is a flowchart of a method of a beam selection method according to an embodiment of the present invention. In this embodiment, the beam selection method is applied to the mobile communication system shown in <FIG>, where the sending device is an access network device, and the receiving device is a terminal. The method includes:
Step <NUM>: the access network device generates, at least one set of beam associating information, where each set of beam associating information includes an association relation between a beam where the SS block (first signal) is borne and a beam where the second signal is borne.

The first signal is a synchronization signal block (SS block); and the second signal includes at least one of a paging signal, a channel state information reference signal (CSI-RS), and a Demodulation Reference Signal (DMRS).

In the embodiment of the present invention, when the second signal includes a paging signal, the foregoing association relation may include: an association relation between the SS block and the paging channel/signal.

When the second signal includes a channel state information reference signal (CSI-RS), the association relation includes: an association relation between an SS block and a CSI-RS resource; and/or an association relation between an SS block and a CSI-RS port.

When the second signal includes a Demodulation Reference Signal (DMRS), the association relation includes: an association relation between an SS block and a DMRS port or port set.

In the embodiment of the present invention, the access network device may send a system information block (SIB) to the terminal in a broadcast manner, and the QCL parameter carried in the SIB indicates the at least one set of beam associating information.

Or, the access network device may also send the at least one set of beam associating information to the terminal through dedicated signaling, such as RRC signaling.

Step <NUM>: the terminal receives, the at least one set of beam associating information.

Accordingly, when the access network device sends the beam associating information through the QCL parameter, the middle and high end receives the QCL parameter in the SIB sent by the access network device through broadcasts, and acquires at least one set of beam associating information indicated by the QCL parameter.

Or,
When the access network device sends the beam associating information through the RRC signaling, the terminal receives at least one set of beam associating information sent by the access network device through the RRC signaling.

Step <NUM>: the terminal selects a beam to be received among beams sent by the access network device according to the at least one set of beam associating information.

In the embodiment of the present invention, the terminal may acquire the signal quality of each beam obtained by measuring the SS block in each beam in advance, and query the second signal associated with the SS block in the beam with the optimal signal quality in each beam according to at least one set of beam associating information, and select the beam with the optimal signal quality as the beam for receiving the second signal associated with the SS block in the beam with the optimal signal quality.

After receiving the beam associating information generated and sent by the access network device, such as the QCL parameter, the terminal accelerates the beam selection process by using the association relation between SS bock and other signals/channels. Specifically, for example, the access network device broadcasts two SS blocks in a <NUM> period, and the access network device also uses two beams to broadcast paging messages. Meanwhile, the access network device indicates the association relation between the two SS blocks and the two beams broadcasting the paging message through the SIB. For example, the QCL parameters indicating SS block1 and paging message1 show that SS block1 and paging message1 are sent on the same beam, and the QCL parameters indicating SS block <NUM> and paging message <NUM> show that SS block <NUM> and paging message <NUM> are sent on another beam. The terminal finds that the signal quality in the beam direction associated with the SS block1 is the strongest when performs the cell search, the terminal can directly listen to the paging message1 in the beam direction associated with the SS block1 according to the above signal association relation. It does not need to perform beam scanning on paging message1 and paging message <NUM> first, and then determine to listen to paging message1 or paging message2 according to the result of beam scanning, thereby speeding up the process of beam selection by the terminal.

In summary, in the method shown in the embodiment of the present invention, the receiving device may perform measurement on the first signal in each beam sent by the sending device to obtain the signal qualities of the respective beams, so as to subsequently directly query to determine which signal is the second signal carried in the beam with the strongest signal according to the received signal association relation while receiving the second signal, thereby receiving the determined second signal directly through the beam with the strongest signal, without beam scanning for the second signal, thereby reducing the steps or times of measuring various signals in the beam, thereby reducing the time taken for beam measurement, accelerating the process of beam measurement and selection of the receiving device, and simplifying system complexity, reducing the latency of data reception.

The following is an apparatus embodiment of an embodiment of the present invention. For the parts that are not elaborated in the apparatus embodiment, reference may be made to the technical details disclosed in the foregoing method embodiments.

Please refer to <FIG>, which is a schematic structural diagram of a beam selection apparatus according to an embodiment of the present invention. The beam selection apparatus can be implemented as all or part of the receiving device by software, hardware, and a combination of both. The beam selection apparatus includes: a receiving unit <NUM> and a processing unit <NUM>;.

Please refer to <FIG>, which is a schematic structural diagram of a beam selection apparatus according to an embodiment of the present invention. The beam selection apparatus can be implemented as all or part of the sending device by software, hardware and a combination of both. The beam selection apparatus includes: a processing unit <NUM> and a sending unit <NUM>;.

Please refer to <FIG>, which is a schematic structural diagram of a receiving device according to an exemplary embodiment of the present invention. The receiving device includes: a processor <NUM>, a receiver <NUM>, a transmitter <NUM>, a memory <NUM>, and a bus <NUM>.

The receiver <NUM> and the transmitter <NUM> can be implemented as a communication component. The communication component can be a communication chip. The communication chip can include a receiving module, a sending module, a modem module, etc., for modulating and/or demodulating information, and receiving or sending the information via wireless signal.

The memory <NUM> is connected to the processor <NUM> via a bus <NUM>.

The memory <NUM> can be used to store software programs and modules.

The memory <NUM> can store at least one of the application modules <NUM> described by the functions. The application module <NUM> can include a receiving module <NUM> and a selecting module <NUM>.

The processor <NUM> is configured to execute the receiving module <NUM> to implement the functions related to the receiving step in the foregoing various method embodiments; the processor <NUM> is configured to execute the selecting module <NUM> to implement the functions related to the beam selecting step in the foregoing various method embodiments.

Moreover, memory <NUM> can be implemented by any type of volatile or non-volatile memory device, or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read only memory (EEPROM), erasable programmable read only memory (EPROM), programmable read only memory (PROM), read only memory (ROM), magnetic memory, flash memory, disk or optical disk.

Please refer to <FIG> , which is a schematic structural diagram of a sending device according to an exemplary embodiment of the present invention. The sending device includes a processor <NUM>, a receiver <NUM>, a transmitter <NUM>, a memory <NUM>, and a bus <NUM>.

The receiver <NUM> and the transmitter <NUM> can be implemented as a communication component. The communication component can be a communication chip. The communication chip can include a receiving module, a sending module, a modem module, etc., for modulating and demodulating information, and receiving or sending the information via wireless signal.

The memory <NUM> can store at least one of the application modules <NUM> described by the functions. The application module <NUM> can include a generating module <NUM> and a sending module <NUM>.

The processor <NUM> is configured to execute the generating module <NUM> to implement the functions of the steps of generating beam associating information in the foregoing various method embodiments; the processor <NUM> is configured to execute the sending module <NUM> to implement the functions related to the sending step in the foregoing method embodiments;.

The embodiment of the invention further provides a beam selection system, which can include a receiving device and a sending device.

The receiving device may include the beam selection apparatus provided in <FIG> above, and the sending device may be the beam selection apparatus provided in <FIG> above.

Or, the receiving device may be the receiving device provided in <FIG> above, and the sending device may be the sending device provided in <FIG> above.

Those skilled in the art should appreciate that in one or more of the above examples, the functions described in the embodiments of the present invention may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored in a computer readable medium or transmitted as one or more instructions or code on a computer readable medium. Computer readable media includes both computer storage media and communication media, the communication media includes any medium that facilitates transfer of a computer program from one location to another. A storage medium may be any available media that can be accessed by a general purpose or special purpose computer.

Claim 1:
A beam selection method, comprising:
receiving (S403), by a receiving device, at least one set of beam associating information sent by a sending device, each set of the beam associating information comprising an association relation between a first beam and at least one second beam, wherein the first beam covers the at least one second beam;
selecting (S404), by the receiving device, according to the at least one set of beam associating information, a beam to be received among beams sent by the sending device;
wherein the association relation between the first beam and the at least one second beam comprises:
a first physical channel associated with the at least one second beam, and a second physical channel associated with the first beam, wherein the first physical channel is a downlink data channel, and the second physical channel is a downlink control channel;
wherein the selecting (S404), by the receiving device, according to the at least one set of beam associating information, a beam to be received among beams sent by the sending device comprises:
when the receiving device receives the first physical channel through a second beam, selecting the first beam associated with the second beam as a beam for receiving the second physical channel according to the at least one set of beam associating information.