Beam indication method, terminal, network device, system, medium, and computer program product

Abstract

The present disclosure relates to a beam indication method, a terminal, a network device, a system, a medium, and a computer program product. The method executed by a terminal comprises: determining indexes of channel state information reference signals (CSI-RSs) corresponding to a quasi co-location (QCL) relationship in a transmission configuration indicator (TCI) state, wherein one index is associated with one CSI-RS, one CSI-RS corresponds to N downlink beams in different directions, and one downlink beam corresponds to one frequency domain subband, N being an integer greater than 1; determining M frequency domain subbands for a network device to send the CSI-RSs, wherein M is an integer greater than or equal to 1 and less than or equal to N; and determining corresponding receiving beams on the basis of M downlink beams corresponding to the M frequency domain subbands. The present disclosure facilitates terminals to more accurately identify and select receiving beams, thereby improving the efficiency and quality of signal reception.

Description

Beam indication method, terminal, network device, system, medium and computer program product TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of communication, and particularly relates to a beam indication method, a terminal, a network device, a system, a medium and a computer program product. BACKGROUND

[0002] With the continuous development of wireless communication, the requirement for communication capability is also higher and higher. For future-oriented application scenarios such as Augmented Reality (AR), Virtual Reality (VR), Internet of Vehicles, Internet of Things, holographic communication, and ultra-high-definition video transmission, ultra-high speed, ultra-low latency, and ultra-large bandwidth communication become the norm. The existing frequency range 1 (FR1) and FR2 have limited bandwidth and cannot support the above-mentioned services. Therefore, higher frequency bands, such as sub-THz and THz, need to be used. According to the electromagnetic wave space loss model, the free space loss of high frequency is higher, and the same transmission power results in a shorter radiation distance. Therefore, large-scale Multiple Input Multiple Output (MIMO) beamforming is needed to solve the problem of short transmission distance. However, in a high-frequency system, the bandwidth is generally large. Due to the large difference in wavelength of different subcarriers, beam squint phenomenon occurs under the action of the same analog beamforming vector, the beam will deviate from the sighting line and spread to other directions like the dispersion of light, and the angle of beam deviation from the sighting line changes with the change of signal frequency, which may affect the reception of signals.

[0003] SUMMARY

[0004] The present disclosure provides a beam indication method, a terminal, a network device, a system, a medium and a computer program product.

[0005] According to a first aspect of the present disclosure, a beam indication method is provided, which is performed by a terminal, and the method comprises: determining an index of a channel state information reference signal (CSI-RS) corresponding to a quasi co-location (QCL) relationship in a transmission configuration indication (TCI) state, one index being associated with one CSI-RS, one CSI-RS corresponding to N downlink beams in different directions, one downlink beam corresponding to one frequency domain subband, and N being an integer greater than 1; determining M frequency domain subbands in which a network device transmits the CSI-RS, wherein M is an integer greater than or equal to 1 and less than or equal to N; and determining a corresponding receiving beam according to M downlink beams corresponding to the M frequency domain subbands.

[0006] According to a second aspect of the embodiments of the present disclosure, a beam indication method is provided, which is performed by a network device, and includes: determining indexes of channel state information reference signals (CSI-RSs) corresponding to quasi co-location (QCL) relationships in transmission configuration indication (TCI) states, one index being associated with one CSI-RS, one CSI-RS corresponding to N downlink beams in different directions, one downlink beam corresponding to one frequency domain sub-band, and N being an integer greater than 1; determining M frequency domain sub-bands used for transmitting the CSI-RSs, where M is an integer greater than or equal to 1 and less than or equal to N; and determining M downlink beams corresponding to the M frequency domain sub-bands.

[0007] According to a third aspect of the embodiments of the present disclosure, a terminal is provided, which includes: a processing module configured to determine indexes of channel state information reference signals (CSI-RSs) corresponding to quasi co-location (QCL) relationships in transmission configuration indication (TCI) states, one index being associated with one CSI-RS, one CSI-RS corresponding to N downlink beams in different directions, one downlink beam corresponding to one frequency domain sub-band, and N being an integer greater than 1; determine M frequency domain sub-bands used for transmitting the CSI-RSs by a network device, where M is an integer greater than or equal to 1 and less than or equal to N; and determine corresponding receiving beams according to M downlink beams corresponding to the M frequency domain sub-bands.

[0008] According to a fourth aspect of the embodiments of the present disclosure, a network device is provided, which includes: a processing module configured to determine indexes of channel state information reference signals (CSI-RSs) corresponding to quasi co-location (QCL) relationships in transmission configuration indication (TCI) states, one index being associated with one CSI-RS, one CSI-RS corresponding to N downlink beams in different directions, one downlink beam corresponding to one frequency domain sub-band, and N being an integer greater than 1; determine M frequency domain sub-bands used for transmitting the CSI-RSs, where M is an integer greater than or equal to 1 and less than or equal to N; and a transceiver configured to determine M downlink beams corresponding to the M frequency domain sub-bands according to the M frequency domain sub-bands.

[0009] According to a fifth aspect of the embodiments of the present disclosure, a terminal is provided, which includes: one or more processors; and a memory coupled to the processors and having stored thereon executable instructions that, when executed by the processors, cause the beam indication method of the first aspect to be performed.

[0010] According to a sixth aspect of the embodiments of the present disclosure, a network device is provided, which includes: one or more processors; and a memory coupled to the processors and having stored thereon executable instructions that, when executed by the processors, cause the beam indication method of the second aspect to be performed.

[0011] According to a seventh aspect of the embodiments of the present disclosure, a communication system is provided, including a terminal and a network device, wherein the terminal is configured to implement the beam indication method of the first aspect, and the network device is configured to implement the beam indication method of the second aspect.

[0012] According to an eighth aspect of the embodiments of the present disclosure, a storage medium is provided, which stores instructions, when the instructions are executed on a communication device, causing the communication device to perform the beam indication method of the first aspect or the second aspect.

[0013] According to a ninth aspect of the embodiments of the present disclosure, a computer program product is provided, including a computer program and / or instructions, which, when executed by a communication device, implement the beam indication method of the first aspect or the second aspect.

[0014] With the above technical solutions, at least the following beneficial technical effects can be achieved:

[0015] In the case that the QCL relationship in the TCI state corresponds to the index of the CSI-RS, one index is associated with one CSI-RS, one CSI-RS corresponds to N different direction downlink beams, one downlink beam corresponds to one frequency domain sub-band, and N is an integer greater than 1, the terminal determines M frequency domain sub-bands in which the network device transmits the CSI-RS, wherein M is an integer greater than or equal to 1 and less than or equal to N, and determines the corresponding receiving beam according to the M downlink beams corresponding to the M frequency domain sub-bands. This way can make the terminal determine which downlink beam or downlink beams the network device uses, so as to facilitate the terminal to more accurately identify and select the corresponding receiving beam, thereby improving the receiving efficiency and receiving quality. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following describes the drawings required for the embodiments, and the following drawings are only some embodiments of the present disclosure, and do not specifically limit the protection scope of the present disclosure.

[0017] FIG. 1A is an exemplary schematic diagram of an architecture of a communication system according to an embodiment of the present disclosure.

[0018] FIG. 1B is a schematic diagram of a beam squint according to an embodiment of the present disclosure.

[0019] FIG. 1C is a schematic diagram of a radio frequency link according to an embodiment of the present disclosure.

[0020] FIG. 1D is a schematic diagram of a beam representation mode 1 according to an embodiment of the present disclosure.

[0021] FIG. 1E is a schematic diagram of a beam representation mode 2 according to an embodiment of the present disclosure.

[0022] FIG. 1F is an emulated effect diagram provided by an embodiment of the present disclosure.

[0023] FIG. 2 is an interaction diagram of a beam indication method according to an embodiment of the present disclosure.

[0024] FIG. 3A is a flow diagram of a beam indication method according to an embodiment of the present disclosure.

[0025] FIG. 3B is a flow diagram of a beam indication method according to an embodiment of the present disclosure.

[0026] FIG. 3C is a flow diagram of a beam indication method according to an embodiment of the present disclosure.

[0027] FIG. 4A is a flow diagram of a beam indication method according to an embodiment of the present disclosure.

[0028] FIG. 4B is a flow diagram of a beam indication method according to an embodiment of the present disclosure.

[0029] FIG. 4C is a flow diagram of a beam indication method according to an embodiment of the present disclosure.

[0030] FIG. 5 is an interaction diagram of a beam indication method according to an embodiment of the present disclosure.

[0031] FIG. 6 is a structural diagram of a terminal according to an embodiment of the present disclosure.

[0032] FIG. 7 is a structural diagram of a network device according to an embodiment of the present disclosure.

[0033] FIG. 8A is a structural diagram of a communication device according to an embodiment of the present disclosure.

[0034] FIG. 8B is a structural diagram of a chip according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0035] The present disclosure provides a beam indication method, a terminal, a network device, a system, a medium and a computer program product.

[0036] In a first aspect, a beam indication method is provided. The method is performed by a terminal and includes determining an index of a channel state information reference signal (CSI-RS) corresponding to a quasi co-location (QCL) relationship in a transmission configuration indication (TCI) state, one index being associated with one CSI-RS, one CSI-RS corresponding to N downlink beams in different directions, one downlink beam corresponding to one frequency domain subband, N being an integer greater than 1; determining M frequency domain subbands in which a network device transmits the CSI-RS, M being an integer greater than or equal to 1 and less than or equal to N; and determining a corresponding receiving beam according to M downlink beams corresponding to the M frequency domain subbands.

[0037] In the above embodiment, in a case where the index of the CSI-RS corresponding to the QCL relationship in the TCI state is determined, one index is associated with one CSI-RS, one CSI-RS corresponds to N downlink beams in different directions, one downlink beam corresponds to one frequency domain subband, and N is an integer greater than 1, the terminal determines M frequency domain subbands in which the network device transmits the CSI-RS, M being an integer greater than or equal to 1 and less than or equal to N, and determines a corresponding receiving beam according to M downlink beams corresponding to the M frequency domain subbands. In this way, the terminal can determine which downlink beam or which downlink beams are used by the network device, so as to facilitate the terminal to accurately identify and select a receiving beam, thereby improving the receiving accuracy of signals and data.

[0038] In some embodiments of the first aspect, the determination of the M frequency domain subbands in which the network device transmits the CSI-RS includes determining first indication information, the first indication information including M frequency domain subband positions indicated by the network device, and determining the M frequency domain subbands according to the first indication information.

[0039] In the above embodiment, in a case where one CSI-RS corresponds to N downlink beams in different directions, the first indication information can be transmitted to the terminal, so as to facilitate the terminal to determine M downlink beams corresponding to the M frequency domain subbands, thereby facilitating the terminal to determine a corresponding receiving beam and improving the receiving effect.

[0040] In some embodiments of the first aspect, the first indication information is included in at least one of the following:

[0041] an indication information field of the TCI state;

[0042] the QCL relationship;

[0043] the index;

[0044] a first message transmitted by the network device.

[0045] In the above embodiments, the indication manners of the plurality of first indication information are specified to adapt to different scene requirements.

[0046] In some embodiments of the first aspect, in some embodiments, the determining the M frequency domain subbands in which the network device transmits the CSI-RS comprises: if the resource configuration of the CSI-RS comprises a first configuration item, determining that M is equal to N, the first configuration item being used to indicate the total number of frequency domain subbands.

[0047] In the above embodiments, according to whether the resource configuration of the CSI-RS comprises the first configuration item, it can be determined whether all (i.e., N) downlink beams associated with the CSI-RS are received. For example, in the case where the resource configuration of the CSI-RS comprises the first configuration item, the terminal needs to receive all the downlink beams associated with the CSI-RS by default, i.e., the terminal needs to receive N downlink beams.

[0048] In some embodiments of the first aspect, in some embodiments, the method further comprises: determining the frequency domain range corresponding to each frequency domain subband according to the starting resource block, the number of resource blocks, and the information that the bandwidths of the frequency domain subbands are the same in the resource configuration.

[0049] In the above embodiments, it can be defaulted that the bandwidths of the N frequency domain subbands corresponding to the N downlink beams are the same, so that the frequency domain ranges corresponding to the N frequency domain subbands can be determined according to the starting resource block and the number of resource blocks configured in the resource configuration.

[0050] In some embodiments of the first aspect, in some embodiments, the method further comprises: if the resource configuration further comprises a second configuration item, determining the frequency domain range corresponding to each frequency domain subband according to the starting resource block, the number of resource blocks, and the second configuration item in the resource configuration, wherein the second configuration item is used to indicate the bandwidth information corresponding to each frequency domain subband.

[0051] In the above embodiments, by configuring the second configuration item in the resource configuration of the CSI-RS, the terminal can be facilitated to determine the bandwidths corresponding to the N frequency domain subbands corresponding to the N downlink beams.

[0052] In the second aspect, the embodiments of the present disclosure provide a beam indication method, executed by a network device, the method comprising: determining an index of a CSI-RS corresponding to a QCL relationship in a TCI state, one index being associated with one CSI-RS, one CSI-RS corresponding to N downlink beams of different directions, one downlink beam corresponding to one frequency domain subband, N being an integer greater than 1; determining M frequency domain subbands used to transmit the CSI-RS, wherein M is an integer greater than or equal to 1 and less than or equal to N; and determining M downlink beams corresponding to the M frequency domain subbands according to the M frequency domain subbands.

[0053] In some embodiments of the second aspect, in some embodiments, the method further includes: sending, to the terminal, first indication information, the first indication information including the M frequency domain sub-band positions indicated by the network device.

[0054] In some embodiments of the second aspect, in some embodiments, the first indication information is included in at least one of:

[0055] an indication information field of the TCI state;

[0056] a QCL relationship;

[0057] an index;

[0058] a first message sent by the network device.

[0059] In some embodiments of the second aspect, in some embodiments, the method further includes: configuring a first configuration item in a resource configuration of the CSI-RS, the first configuration item being a total number of frequency domain sub-bands, the resource configuration including the first configuration item being used to indicate that M is equal to N.

[0060] In some embodiments of the second aspect, in some embodiments, the method further includes: configuring a second configuration item in a resource configuration of the CSI-RS, the second configuration item being used to indicate bandwidth information corresponding to each frequency domain sub-band respectively.

[0061] In some embodiments of the second aspect, in some embodiments, the method further includes: the resource configuration of the CSI-RS not including a second configuration item, the second configuration item being used to indicate bandwidth information corresponding to each frequency domain sub-band respectively, the resource configuration not including the second configuration item being used to indicate that the bandwidths of the frequency domain sub-bands are the same.

[0062] In a third aspect, the embodiments of the present disclosure provide a terminal, the terminal including at least one of a transceiver module and a processing module; wherein the terminal is configured to perform the optional implementation manners of the first aspect.

[0063] In a fourth aspect, the embodiments of the present disclosure provide a network device, the network device including at least one of a transceiver module and a processing module; wherein the network device is configured to perform the optional implementation manners of the second aspect.

[0064] In a fifth aspect, the embodiments of the present disclosure provide a terminal, the terminal including one or more processors; wherein the terminal is configured to perform the optional implementation manners of the first aspect.

[0065] In a sixth aspect, the embodiments of the present disclosure provide a network device, the network device comprising: one or more processors; wherein the network device is configured to perform the method described in the optional implementation of the second aspect.

[0066] In a seventh aspect, the embodiments of the present disclosure provide a communication system, the communication system comprising: a terminal, a network device; wherein the terminal is configured to perform the method described in the optional implementation of the first aspect, and the network device is configured to perform the method described in the optional implementation of the second aspect.

[0067] In an eighth aspect, the embodiments of the present disclosure provide a storage medium, the storage medium storing instructions that, when executed on a communication device, cause the communication device to perform the method described in the optional implementation of the first aspect and / or the second aspect.

[0068] In a ninth aspect, the embodiments of the present disclosure provide a program product, the program product, when executed by a communication device, causing the communication device to perform the method described in the optional implementation of the first aspect and / or the second aspect.

[0069] In a tenth aspect, the embodiments of the present disclosure provide a computer program, when executed on a computer, causing the computer to perform the method described in the optional implementation of the first aspect and / or the second aspect.

[0070] In an eleventh aspect, the embodiments of the present disclosure provide a chip or chip system. The chip or chip system comprises processing circuitry configured to perform the method described in the optional implementation of the first aspect and / or the second aspect.

[0071] It can be understood that the terminal, the network device, the communication device, the communication system, the storage medium, the program product, the computer program, the chip or the chip system are all used to perform the method proposed in the embodiments of the present disclosure. Therefore, the beneficial effects they can achieve can refer to the beneficial effects in the corresponding method, which will not be described here.

[0072] The embodiments of the present disclosure provide a beam indication method, a terminal, a network device, a system, a medium and a computer program product. In some embodiments, the terms of beam indication method, information processing method and communication method can be replaced with each other, the terms of beam indication device, information processing device and communication device can be replaced with each other, and the terms of communication system, information processing system and beam indication system can be replaced with each other.

[0073] The embodiments of the present disclosure are not exhaustive, but only illustrate some embodiments, and are not specific limitations on the protection scope of the present disclosure. In the case of no contradiction, each step in an embodiment can be implemented as an independent embodiment, and the steps can be combined arbitrarily, for example, the scheme after removing part of the steps in an embodiment can also be implemented as an independent embodiment, and the order of the steps in an embodiment can be exchanged arbitrarily, in addition, the optional implementation manners in an embodiment can be combined arbitrarily; in addition, the embodiments can be combined arbitrarily, for example, part or all steps of different embodiments can be combined arbitrarily, an embodiment can be combined with optional implementation manners of other embodiments arbitrarily.

[0074] In each embodiment of the present disclosure, the terms and / or descriptions between the embodiments are consistent if there is no special description and logical conflict, and can be referred to each other, and the technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0075] The terms used in the embodiments of the present disclosure are only for the purpose of describing the specific embodiments, and not as a limitation on the present disclosure.

[0076] In the embodiments of the present disclosure, unless otherwise specified, the elements expressed in singular form, such as "one", "a", "the", "above", "said", "preceding", "this" and the like, can represent "one and only one", and can also represent "one or more", "at least one" and the like. For example, in the case of using articles such as "a", "an", "the" and the like in English, the noun after the article can be understood as singular expression, and can also be understood as plural expression.

[0077] In the embodiments of the present disclosure, "a plurality of" means two or more.

[0078] In some embodiments, the terms "at least one of", "one or more", "a plurality of", "multiple" and the like can be replaced with each other.

[0079] In some embodiments, "at least one of A, B", "A and / or B", "in one case A, in another case B", "responsive to case A, responsive to case B" and the like, can be used to represent one or more of the following technical solutions: in some embodiments, A (A is executed regardless of B); in some embodiments, B (B is executed regardless of A); in some embodiments, A and B are selected from (A and B are selectively executed); in some embodiments, A and B (A and B are executed). When there are more branches such as A, B, C, and the like, the above is similar.

[0080] In some embodiments, "A or B" and the like can include the following technical solutions according to the case: in some embodiments, A (A is executed regardless of B); in some embodiments, B (B is executed regardless of A); in some embodiments, A and B are selected from (A and B are selectively executed). When there are more branches such as A, B, C, and the like, the above is similar.

[0081] In the embodiments of the present disclosure, the prefix words "first", "second" and the like are only used to distinguish different description objects, and do not constitute limitation on the position, order, priority, quantity or content of the description objects. The description of the description objects should be referred to the description in the context of the claims or embodiments, and should not be limited by the prefix words. For example, the description object is "field", and the ordinal words before "field" in "first field" and "second field" do not limit the position or order between "fields", and "first" and "second" do not limit whether the "fields" modified thereby are in the same message or not, nor limit the order of "first field" and "second field". For another example, the description object is "level", and the ordinal words before "level" in "first level" and "second level" do not limit the priority between "levels". For another example, the quantity of the description object is not limited by the ordinal words, and can be one or more. For example, "first device", wherein the quantity of "device" can be one or more. In addition, the objects modified by different prefix words can be the same or different, for example, the description object is "device", and "first device" and "second device" can be the same device or different devices, and the types thereof can be the same or different; for another example, the description object is "information", and "first information" and "second information" can be the same information or different information, and the content thereof can be the same or different.

[0082] In some embodiments, "including A", "containing A", "for indicating A", "carrying A" can be interpreted as directly carrying A, or indirectly indicating A.

[0083] In some embodiments, the terms "in response to", "in response to determining", "in the case of", "when", "when", "if", "if" and the like can be replaced with each other.

[0084] In some embodiments, the terms "greater than", "greater than or equal to", "not less than", "more than", "more than or equal to", "not less than", "higher than", "higher than or equal to", "not lower than", "above", and the like can be replaced with each other, and the terms "less than", "less than or equal to", "not greater than", "fewer than", "fewer than or equal to", "not more than", "lower than", "lower than or equal to", "not higher than", "below", and the like can be replaced with each other.

[0085] In some embodiments, an apparatus and the like can be interpreted as an entity, and can also be interpreted as virtual, and the name thereof is not limited to the name recited in the embodiments, and the terms "apparatus", "equipment", "device", "circuit", "network element", "node", "function", "unit", "section", "system", "network", "chip", "chip system", "entity", "subject", and the like can be replaced with each other.

[0086] In some embodiments, "network" can be interpreted as an apparatus (for example, an access network device, a core network device, and the like) included in the network.

[0087] In some embodiments, the terms “access network device (AN device),” “radio access network device (RAN device),” “base station (BS),” “radio base station,” “fixed station,” “node,” “access point,” “transmission point (TP),” “reception point (RP),” “transmission / reception point (TRP),” “panel,” “antenna panel,” “antenna array,” “cell,” “macro cell,” “small cell,” “femto cell,” “pico cell,” “sector,” “cell group,” “serving cell,” “carrier,” “component carrier,” “bandwidth part (BWP),” and the like can be used interchangeably.

[0088] In some embodiments, the terms "terminal," "terminal device," "user equipment (UE)," "user terminal," "mobile station (MS)," "mobile terminal (MT)," "subscriber station," "mobile unit," "subscriber unit," "wireless unit," "remote unit," "mobile device," "wireless device," "wireless communication device," "remote device," "mobile subscriber station," "access terminal," "mobile terminal," "wireless terminal," "remote terminal," "handset," "user agent," "mobile client," "client," and so on can be replaced with each other.

[0089] In some embodiments, the access network device, the core network device, or the network device can be replaced with a terminal. For example, the embodiments of the present disclosure can also be applied to a structure in which communication between the access network device, the core network device, or the network device and the terminal is replaced with communication between a plurality of terminals (e.g., device-to-device (D2D), vehicle-to-everything (V2X), etc.). In this case, the terminal can also be configured to have all or part of the functions of the access network device. In addition, the terms "uplink," "downlink," and the like can also be replaced with terms corresponding to the inter-terminal communication (e.g., "side"). For example, the uplink channel, the downlink channel, and the like can be replaced with the side channel, and the uplink, the downlink, and the like can be replaced with the sidelink.

[0090] In some embodiments, the terminal can be replaced with the access network device, the core network device, or the network device. In this case, the access network device, the core network device, or the network device can also be configured to have all or part of the functions of the terminal.

[0091] In some embodiments, the data, information, etc. can be obtained in compliance with the laws and regulations of the country where the location is situated.

[0092] In some embodiments, the data, information, etc. can be obtained after obtaining the consent of the user.

[0093] In addition, each element, each row, or each column in the table of the embodiments of the present disclosure can be implemented as an independent embodiment, and any combination of any element, any row, or any column can also be implemented as an independent embodiment.

[0094] FIG. 1A is a schematic diagram of an architecture of a communication system according to an embodiment of the present disclosure. As shown in FIG. 1A, the communication system 100 can include a terminal 101 and a network device 102.

[0095] In some embodiments, the terminal 101 includes at least one of a mobile phone, a wearable device, an Internet of Things device, a communication-capable automobile, a smart automobile, a tablet computer (Pad), a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical surgery, a wireless terminal device in smart grid, a wireless terminal device in transportation safety, a wireless terminal device in smart city, a wireless terminal device in smart home, etc., but is not limited thereto.

[0096] In some embodiments, the network device 102 can include at least one of an access network device and a core network device.

[0097] Optionally, the network device 102 is an access network device. Optionally, the access network device is at least one of a node or device that accesses a terminal to a wireless network, and can include at least one of an evolved NodeB (eNB) in a 5G communication system, a next generation eNB (ng-eNB), a next generation NodeB (gNB), a node B (NB), a home node B (HNB), a home evolved node B (HeNB), a wireless backhaul device, a radio network controller (RNC), a base station controller (BSC), a base transceiver station (BTS), a base band unit (BBU), a mobile switching center, a base station in a 6G communication system, an Open RAN, a Cloud RAN, a base station in other communication systems, an access node in a Wi-Fi system, but is not limited thereto.

[0098] In some embodiments, the network device 102 is a base station. Optionally, the base station is at least one of a macro base station, a micro base station (also referred to as a small station), a relay station, an access point, a 5G base station or a future base station, a satellite, a Transmitting and Receiving Point (TRP), a Transmitting Point (TP), a mobile switching center, or other devices that perform a base station function in a communication system, etc., and the embodiments of the present disclosure are not limited thereto. For convenience of description, in all embodiments of the present disclosure, devices that provide a wireless communication function for a terminal device are collectively referred to as network devices or base stations.

[0099] In some embodiments, the network device 102 is a core network device. Optionally, the core network device can be one device including all or part of a first network element, a second network element, etc., or can be a plurality of devices or device groups including all or part of the first network element, the second network element, etc. The network element can be virtual or physical. The core network includes at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), etc.

[0100] In some embodiments, the technical solutions of the present disclosure can be applied to an Open RAN architecture, at this time, the interfaces between or within the access network devices involved in the embodiments of the present disclosure can become internal interfaces of the Open RAN, and the processes and information interactions between these internal interfaces can be implemented through software or programs.

[0101] In some embodiments, the access network device can be composed of a central unit (CU) and a distributed unit (DU), where the CU can also be referred to as a control unit. The CU-DU structure can split the protocol layers of the access network device, and some of the functions of the protocol layers are controlled by the CU, and the remaining or all of the functions of the protocol layers are distributed in the DU and controlled by the CU. However, the present disclosure is not limited thereto.

[0102] It can be understood that the communication system described in the embodiments of the present disclosure is for more clearly illustrating the technical solutions of the embodiments of the present disclosure, and does not constitute a limitation on the technical solutions proposed by the embodiments of the present disclosure. It can be known by those skilled in the art that, as the system architecture evolves and new business scenarios appear, the technical solutions proposed by the embodiments of the present disclosure are also applicable to similar technical problems.

[0103] The following embodiments of the present disclosure can be applied to the communication system 100 shown in FIG. 1A or part of the subject, but are not limited thereto. The subjects shown in FIG. 1A are exemplary, and the communication system can include all or part of the subjects in FIG. 1A, or other subjects other than FIG. 1A. The number and form of each subject is arbitrary, each subject can be physical or virtual, the connection relationship between each subject is exemplary, each subject can not be connected or can be connected, the connection can be in any way, can be direct connection or indirect connection, can be wired connection or wireless connection.

[0104] Embodiments of the present disclosure can be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 5G New Radio (NR), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (Bluetooth (registered trademark)), Public Land Mobile Network (PLMN) network, Device-to-Device (D2D) system, Machine to Machine (M2M) system, Internet of Things (IoT) system, Vehicle-to-Everything (V2X), system using other communication methods, next-generation system expanded based thereon, and the like. Further, a plurality of systems can be applied in combination (for example, combination of LTE or LTE-A and 5G, and the like).

[0105] In some embodiments, according to the electromagnetic wave space loss model, the free space loss of high frequency is higher, and the same transmission power results in a shorter radiation distance, so it is necessary to solve the problem of short transmission distance by large-scale MIMO beamforming. The width of the beam is related to the size of the antenna array and the frequency, that is, the higher the frequency, the narrower the beam, and the larger the size of the antenna array, the narrower the beam. This results in a very narrow beam of high-frequency large-scale MIMO, so the high-frequency large-scale MIMO system needs more beams than the New Radio (NR) system to cover the same cell. And because the reflection and diffraction ability of high-frequency electromagnetic waves is poor, it is generally considered that only the Line-of-Sight path (Los path).

[0106] In some embodiments, in a high-frequency system, the bandwidth is generally large, and because the wavelength difference of different subcarriers is large, it will cause beam squint phenomenon under the action of the same analog beamforming vector. The beam will deviate from the aiming line and spread to other directions like the dispersion of light, and the angle of beam deviation from the aiming line changes with the change of signal frequency. This phenomenon will cause the loss of antenna array gain, and will change the original narrow beam into a wide beam related to the subcarrier. See FIG. 1B for details.

[0107] In some embodiments, for the beam squint phenomenon, on the one hand, beam squint may cause array gain loss. Research shows that a layer of true-time-delay (TTD) or delay-phase-precoding (DPP) network can be added before the antenna array phase shifter to compensate for the array gain loss caused by beam squint by carefully designing the TTD or DPP parameters. On the other hand, beam squint expands the width of a single analog beam, changing it from a narrow beam to a wide beam. Based on this, the gNB can cover more users at the same time, and by carefully designing the TTD or DPP parameters, the direction of beam deviation of different subcarriers can be controlled to align the beam with the target user direction.

[0108] Referring to FIGS. 1C, 1D, and 1E, by designing the values of each delay, beam behavior 1 in FIG. 1D and beam behavior 2 in FIG. 1E can be achieved. Wherein, beam behavior 1 indicates that the beams corresponding to different subcarriers cover a continuous angle range, and beam behavior 2 indicates that the directions of beams corresponding to different subcarriers are independent and unrelated. The simulation effect diagram is shown in FIG. 1F. In FIG. 1C, t 1～N represents the value of the delay, represents the phase value, and 1-M represents the antenna.

[0109] In some embodiments, the downlink beam indication is indicated by a transmission configuration indicator (TCI) state, wherein one reference signal ID (CSI-RS / SSB) is included in the TCI state. When the reference signal is CSI-RS, if beam behavior 2 is used for transmission, it means that one CSI-RS is associated with two analog beams at the same time. If the entire bandwidth resource is configured to one terminal, it also means that the terminal needs to use two analog beams to receive the transmission beam. However, the CSI-RS resource configuration is a continuous resource configuration, that is, the CSI-RS corresponds to only one CSI-RS ID. Therefore, in this way, the terminal cannot determine which analog beam is used by the base station for transmission, and further cannot determine the receiving beam according to the TCI state. Therefore, it is necessary to further indicate the frequency domain index information or other information to assist the terminal to select the corresponding receiving beam.

[0110] In some embodiments, the present disclosure proposes a beam indication method, a terminal, a network device, a system, a medium and a computer program product. When one CSI-RS is associated with at least two analog beams in the system, that is, the base station can transmit at least two different direction CSI-RS beams at the same time, the present disclosure can assist the terminal to determine the actual transmission beam of the base station, and further assist the terminal to select the corresponding receiving beam, thereby improving the efficiency and quality of signal reception.

[0111] FIG. 2 is an interaction schematic diagram of a beam indication method according to an embodiment of the present disclosure. As shown in FIG. 2, the present embodiment relates to a beam indication method, which is performed by the communication system 100, and the above method comprises:

[0112] In step S201, the network device 102 indicates an activated TCI state to the terminal 101.

[0113] In some embodiments, the network device sends downlink control information (DCI) to the terminal, and the downlink control information indicates the activated TCI state. The terminal receives the downlink control information and determines the activated TCI state.

[0114] In some embodiments, the network device indicates one or more activated TCI states to the terminal.

[0115] Before step S201, the network device can activate the corresponding TCI state according to the needs.

[0116] In some embodiments, if a Quasi Co-Location (QCL) relationship in a TCI state activated by the network device corresponds to an index of a CSI-RS, and one index is associated with one CSI-RS, one CSI-RS corresponds to N downlink beams of different directions, and one downlink beam corresponds to one frequency domain subband, the network device can determine or select M frequency domain subbands for transmitting the CSI-RS corresponding to the TCI state, for example, the M frequency domain subbands can be selected based on beam sweeping or beam measurement results. Further, the network device can determine M downlink beams corresponding to the M frequency domain subbands. The M downlink beams corresponding to the M frequency domain subbands are the beams used by the network device to transmit the CSI-RS to the terminal. The network device can use the M downlink beams to transmit any data, message, or signal.

[0117] In some embodiments, when the network device needs to transmit Physical Downlink Shared Channel (PDSCH) data, Physical Downlink Control Channel (PDCCH) data, or other communication data to the terminal, the corresponding TCI state can be activated to indicate to the terminal that these data are transmitted using the same transmission beam as the CSI-RS associated with the TCI state, i.e., using the M downlink beams of the CSI-RS indicated by the TCI state, thereby facilitating the terminal to determine the corresponding reception beam to receive these data.

[0118] In some embodiments, the M downlink beams can also be referred to as M transmission beams.

[0119] It should be explained that the QCL relationship refers to, in 5G NR, if signals on two different antenna ports have certain common large-scale channel properties, these properties can be inferred from each other, then the two ports are considered to have a QCL relationship.

[0120] In some embodiments, the association of the TCI state with the QCL allows a specific TCI state to be mapped / associated to a specific beam direction or transmission point.

[0121] Optionally, N is an integer greater than 1. For example, N is equal to 2.

[0122] Optionally, M is an integer greater than or equal to 1 and less than or equal to N. For example, M is equal to 1, or M is equal to N.

[0123] In some embodiments, the implementation of the network device using M frequency domain subbands corresponding to M downlink beams to send messages or signals to the terminal can be understood as that the network device concentrates energy on the M downlink beams corresponding to the M frequency domain subbands to send messages or signals to the terminal. The remaining N-M beams can not be used to send messages or signals, or the remaining N-M beams can not need to be received by the terminal, or the terminal cannot receive the remaining N-M beams.

[0124] In step S202, the terminal 101 determines the indexes of the CSI-RS corresponding to the QCL relationship in the TCI state, one index is associated with one CSI-RS, one CSI-RS corresponds to N downlink beams of different directions, and one downlink beam corresponds to one frequency domain subband.

[0125] In some embodiments, the N downlink beams of different directions refer to N downlink beams that are independent and irrelevant to each other. Among them, a beam has directionality, one beam corresponds to one direction, one beam corresponds to one frequency domain subband, and the selection of the beam means the selection of the frequency domain subband, that is, the signal energy is concentrated and sent to a specific direction.

[0126] In some embodiments, the TCI state includes the QCL relationship, or the TCI state corresponds to the QCL relationship.

[0127] In step S203, the terminal 101 determines M frequency domain subbands.

[0128] In some embodiments, the terminal determines the M frequency domain subbands of the CSI-RS indicated by the network device to send the TCI state. The M frequency domain subbands are the subbands of the CSI-RS indicated by the network device to send the TCI state.

[0129] In step S204, the terminal 101 determines M downlink beams corresponding to the M frequency domain subbands.

[0130] In some embodiments, the terminal determines the M frequency domain subbands of the CSI-RS used by the network device to send the TCI state indication, and determines the M downlink beams corresponding to the M frequency domain subbands. That is, it can be understood that the terminal determines the M downlink beams corresponding to the CSI-RS indicated by the TCI state. The M downlink beams are the transmission beams corresponding to the CSI-RS indicated by the TCI state.

[0131] In some embodiments, the implementation of the terminal determining the M frequency domain subbands of the CSI-RS sent by the network device includes that the terminal determines first indication information and determines the M frequency domain subbands according to the first indication information, wherein the first indication information includes the position of the M frequency domain subbands indicated by the network device. For example, the first indication information includes the frequency domain position of the M frequency domain subbands.

[0132] In some embodiments, the name of the first indication information is not limited, which is, for example, frequency domain index information, auxiliary information, and the like.

[0133] In some embodiments, the first indication information includes at least one of the following:

[0134] indication information field of the TCI state;

[0135] QCL relationship;

[0136] index;

[0137] The first message sent by the network device.

[0138] The length of the first indication information is not limited in the disclosure, which is, for example, 1 bit, 2 bits, and the like.

[0139] For example, the network device can send the first message to the terminal, and the first message includes the first indication information. The terminal receives the first message and obtains the first indication information. Wherein, the first message can be a system message, RRC signaling, downlink control information, and the like, which is not limited in the disclosure.

[0140] For example, assuming that N is equal to 2 and M is equal to 1. K (K is greater than or equal to 1) bits can be added to the index of the CSI-RS indicated by the TCI state, which is used to carry the first indication information. When the K (assuming K is equal to 1) bit position 0, it can represent that the beam corresponding to the CSI-RS indicated by the TCI state is the beam corresponding to the high frequency part, and when the K (assuming K is equal to 1) bit position 1, it can represent that the beam corresponding to the CSI-RS indicated by the TCI state is the beam corresponding to the low frequency part.

[0141] For example, assuming that N is equal to 2 and M is equal to 1. K (K is greater than or equal to 1) bits can be added to the indication information field contained in the TCI state, which is used to carry the first indication information. When the K (assuming K is equal to 1) bit position 0, it can represent that the beam corresponding to the CSI-RS indicated by the TCI state is the beam corresponding to the low frequency part, and when the K (assuming K is equal to 1) bit position 1, it can represent that the beam corresponding to the CSI-RS indicated by the TCI state is the beam corresponding to the high frequency part.

[0142] In some embodiments, in addition to the above, the M frequency domain subbands / downlink beams corresponding to the CSI-RS associated with the TCI state can also be indicated to the terminal in an implicit manner through the first indication information.

[0143] In some embodiments, the terminal determines the implementation of the M frequency domain subbands in which the network device transmits the CSI-RS, including: determining the M frequency domain subbands in which the network device transmits the CSI-RS according to the specific configuration item included in the resource configuration of the CSI-RS.

[0144] Optionally, in the case where the resource configuration of the CSI-RS includes the first configuration item, it can be determined that M is equal to N. Wherein, the first configuration item is used to indicate the total number of frequency domain subbands. For example, by adding the first configuration item in the resource configuration of the CSI-RS, and the value of the first configuration item is not empty, it can be defaulted that M is equal to N, that is, the terminal needs to receive all (i.e. N) different direction downlink beams corresponding to the CSI-RS. And when M is equal to N, it means that the entire bandwidth resource is configured to the terminal 101.

[0145] In some embodiments, the terminal can determine that the bandwidth of each frequency domain subband is the same according to the protocol specification or default information. The terminal can determine the frequency domain range corresponding to each frequency domain subband according to the starting resource block, the number of resource blocks, and the information that the bandwidth of each frequency domain subband is the same configured in the resource configuration.

[0146] For example, assuming that the QCL relationship contained in the TCI state corresponds to the index of the CSI-RS, and one index is associated with two beams. When the gNB configures the CSI-RS resource, the current continuous resource is further indicated by sub-band through RRC signaling. Specifically: in addition to configuring the current CSI-RS frequency domain resource information including starting resource block (startingRB) and number of resource blocks (nrofRBs) in the RRC signaling, a first configuration item (sub-bandNums) for indicating the total number of frequency domain subbands can also be configured, wherein each subband corresponds to a downlink beam. Specifically, when the first configuration item is configured as 2, it means that the sending end divides the entire bandwidth into two subbands, and each subband corresponds to a different downlink beam. And the bandwidth of the two subbands is the same, that is, the bandwidth of each subband is equal to half of the total bandwidth. At this time, it is defaulted that the starting position of the subband 1 is equal to startingRB. In this way, the frequency domain range corresponding to the two subbands can be determined according to the starting resource block and the number of resource blocks configured in the resource configuration.

[0147] In some embodiments, the terminal can determine the frequency domain range of each frequency domain subband according to the specific configuration item included in the resource configuration of the CSI-RS.

[0148] Optionally, if the terminal determines that the resource configuration also includes a second configuration item, it can determine the frequency domain range corresponding to each frequency domain sub-band based on the starting resource block, the number of resource blocks configured in the resource configuration, and the second configuration item. The second configuration item is used to indicate the bandwidth information corresponding to each frequency domain sub-band.

[0149] For example, assume that the QCL relationship contained in the TCI state corresponds to the CSI-RS index, and one index is associated with two beams. When configuring CSI-RS resources in the gNB, subband indication is further performed on the current continuous resources through RRC signaling. Specifically, in addition to configuring the current CSI-RS frequency domain resource information, including the starting resource block (startingRB), the number of resource blocks (nrofRBs), and the first configuration item (sub-bandNums), a second configuration item can also be configured to indicate the coefficient sub-bandNumsFactor for each subband width. Specifically, when the first configuration item is 2, the second configuration item also needs to be configured to include two sub-bandNumsFactor parameters, where the sum of the two sub-bandNumsFactor parameters is 1, which can be [1 / 2, 1 / 2], [1 / 3, 2 / 3], etc. In this case, the default starting position of subband 1 is equal to startingRB. In this way, the frequency domain range corresponding to the two sub-bands can be determined based on the starting resource block, the number of resource blocks, and the second configuration item configured in the resource configuration.

[0150] In step S205, terminal 101 determines the receiving beams corresponding to the M downlink beams.

[0151] In some embodiments, the number of receiving beams is M.

[0152] In some embodiments, the receiving beams corresponding to the M downlink beams are used to receive data or signals transmitted through the M downlink beams.

[0153] In some embodiments, a network device may transmit any message or signal through M downlink beams, and a terminal may receive the arbitrary message or signal transmitted through the M downlink beams using a receiving beam corresponding to the M downlink beams.

[0154] In some embodiments, the terminal selects the corresponding receiving beam based on the M downlink beams, and the terminal uses the determined receiving beam to receive the M downlink beams, which can improve the reception quality and effect.

[0155] In some embodiments, the names of information and the like are not limited to the names described in the embodiments, and terms such as "information", "message", "signal", "signaling", "report", "configuration", "indication", "instruction", "command", "channel", "parameter", "field", "symbol", "codebook", "codeword", "codepoint", "bit", "data", "program", "chip", and the like can be replaced with each other.

[0156] In some embodiments, terms such as "downlink control information (DCI)", "downlink (DL) assignment", "DL DCI", "uplink (UL) grant", "UL DCI", and the like can be replaced with each other.

[0157] In some embodiments, terms such as "synchronization signal (SS)", "synchronization signal block (SSB)", "reference signal (RS)", "pilot", "pilot signal", and the like can be replaced with each other.

[0158] In some embodiments, terms such as "resource block (RB)", "physical resource block (PRB)", "sub-carrier group (SCG)", "resource element group (REG)", "PRB pair", "RB pair", "resource element (RE)", "sub-carrier", and the like can be replaced with each other.

[0159] In some embodiments, "acquire", "obtain", "get", "receive", "transmit", "bidirectionally transmit", "send and / or receive" can be replaced by each other, which can be interpreted as receiving from other subjects, acquiring from protocols, acquiring from higher layers, obtaining by self-processing, autonomously implementing, and the like.

[0160] In some embodiments, the terms "send", "transmit", "report", "issue", "transmit", "bidirectionally transmit", "send and / or receive", and the like can be replaced by each other.

[0161] In some embodiments, the terms "certain", "preset", "preset", "set", "indicated", "certain", "arbitrary", "first", and the like can be replaced by each other. "Certain A", "preset A", "preset A", "set A", "indicated A", "certain A", "arbitrary A", "first A" can be interpreted as A specified in advance in protocols and the like, A obtained by setting, configuration, or indication, and the like, A specified, certain, arbitrary, or first A, but not limited thereto.

[0162] The communication method related to the embodiments of the present disclosure can include at least one of steps S201-S205. For example, step S201 can be implemented as an independent embodiment, step S202 can be implemented as an independent embodiment, steps S202, S203, S204, and S205 can be implemented as independent embodiments, but not limited thereto.

[0163] In some embodiments, the order of any two steps in steps S201-S205 can be exchanged or executed simultaneously. For example, steps S202 and S203 can be exchanged or executed simultaneously.

[0164] In some embodiments, steps S202-S205 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0165] In some embodiments, steps S201, S203-S205 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0166] In some embodiments, step S201 is optional.

[0167] In some embodiments, other optional implementations described before or after the corresponding description of FIG. 2 can be referred to.

[0168] FIG. 3A is a flowchart illustrating a beam indication method according to an embodiment of the present disclosure. As shown in FIG. 3A, the present embodiment relates to a beam indication method, which is performed by a terminal side, and the method comprises the following steps.

[0169] In step S3101, first indication information is received.

[0170] The optional implementation of step S3101 can refer to the optional implementation of step S203 in FIG. 2 and other associated parts in the embodiments related to FIG. 2, which will not be repeated here.

[0171] In some embodiments, the terminal 101 receives the first indication information sent by the network device 102, but is not limited thereto, and can also receive the first indication information sent by other subjects.

[0172] In some embodiments, the terminal 101 obtains the first indication information specified by a protocol.

[0173] In some embodiments, the terminal 101 obtains the first indication information from an upper layer.

[0174] In some embodiments, the terminal 101 processes to obtain the first indication information.

[0175] In some embodiments, step S3101 is omitted, and the terminal 101 autonomously implements the function indicated by the first indication information, or the above function is default or default.

[0176] In step S3102, the index of the CSI-RS corresponding to the QCL relationship in the TCI state is determined, one index is associated with one CSI-RS, one CSI-RS corresponds to N downlink beams with different directions, and one downlink beam corresponds to one frequency domain sub-band.

[0177] The optional implementation of step S3102 can refer to the optional implementation of steps S201 and S202 in FIG. 2 and other associated parts in the embodiments related to FIG. 2, which will not be repeated here.

[0178] In step S3103, M downlink beams corresponding to M frequency domain sub-bands are determined according to the first indication information.

[0179] The optional implementation of step S3103 can refer to the optional implementation of steps S203 and S204 in FIG. 2 and other associated parts in the embodiments related to FIG. 2, which will not be repeated here.

[0180] In step S3104, a receiving beam corresponding to the M downlink beams is selected.

[0181] The optional implementation of step S3104 can refer to the optional implementation of step S205 in FIG. 2 and other associated parts in the embodiments related to FIG. 2, which are not described herein again.

[0182] The communication method related to the embodiments of the present disclosure can include at least one of steps S3101-S3104. For example, step S3102 can be implemented as an independent embodiment, steps S3102 and S3103 can be implemented as independent embodiments, steps S3102, S3103 and S3104 can be implemented as independent embodiments, but are not limited thereto.

[0183] In some embodiments, the order of any two of steps S3101-S3104 can be exchanged or executed simultaneously. For example, steps S3101 and S3102 can be exchanged or executed simultaneously.

[0184] In some embodiments, steps S3101, S3103 and S3104 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0185] In some embodiments, steps S3101 and S3104 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0186] In some embodiments, step S3101 is optional.

[0187] FIG. 3B is a flow diagram of a beam indication method according to an embodiment of the present disclosure. As shown in FIG. 3B, the embodiments of the present disclosure relate to a beam indication method, which is performed by the terminal side, and the above method includes:

[0188] In step S3201, the indexes of the CSI-RS corresponding to the QCL relationship in the TCI state are determined, one index is associated with one CSI-RS, one CSI-RS corresponds to N downlink beams with different directions, and one downlink beam corresponds to one frequency domain sub-band.

[0189] The optional implementation of step S3201 can refer to the optional implementation of step S202 in FIG. 2, the optional implementation of step S3102 in FIG. 3A, and other associated parts in the embodiments related to FIG. 2 and FIG. 3A, which are not described herein again.

[0190] In step S3202, M frequency domain sub-bands are determined according to the resource configuration of the CSI-RS including the first configuration item, and M is equal to N.

[0191] The optional implementation of step S3202 can refer to the optional implementation of step S203 in FIG. 2 and other associated parts in the embodiments involved in FIG. 2, which will not be repeated here.

[0192] In step S3203, the frequency domain ranges corresponding to the M frequency domain subbands are determined.

[0193] The optional implementation of step S3203 can refer to the optional implementation of step S203 in FIG. 2 and other associated parts in the embodiments involved in FIG. 2, which will not be repeated here.

[0194] In step S3204, the receiving beams of the transmitting beams corresponding to the M frequency domain subbands are determined.

[0195] The optional implementation of step S3204 can refer to the optional implementation of steps S204 and S205 in FIG. 2 and other associated parts in the embodiments involved in FIG. 2, which will not be repeated here.

[0196] The communication method involved in the embodiments of the present disclosure can include at least one of steps S3201 to S3204. For example, step S3201 can be implemented as an independent embodiment, step S3202 can be implemented as an independent embodiment, and step S3203 can be implemented as an independent embodiment, but is not limited thereto.

[0197] In some embodiments, the order of any two of steps S3201 to S3204 can be exchanged or executed simultaneously.

[0198] In some embodiments, steps S3202 to S3204 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0199] In some embodiments, steps S3201, S3203 and S3204 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0200] In some embodiments, steps S3201, S3202 and S3204 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0201] In some embodiments, steps S3202 and S3203 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0202] In the embodiments of the present disclosure, step S3201 can be combined with step S201 in FIG. 2.

[0203] FIG. 3C is a flow diagram of a beam indication method according to an embodiment of the present disclosure. As shown in FIG. 3C, the embodiment of the present disclosure relates to a beam indication method, which is performed by a terminal side, and the above method comprises the following steps.

[0204] In step S3301, indexes of CSI-RSs corresponding to QCL relationships in the TCI state are determined, one index is associated with one CSI-RS, one CSI-RS corresponds to N downlink beams of different directions, and one downlink beam corresponds to one frequency domain sub-band.

[0205] The optional implementation of step S3301 can refer to the optional implementation of step S201, step S202 of FIG. 2, step S3102 of FIG. 3A, and other associated parts in the embodiments related to FIG. 2 and FIG. 3A, which will not be repeated here.

[0206] In step S3302, M frequency domain sub-bands in which the network device transmits the CSI-RS are determined.

[0207] The optional implementation of step S3302 can refer to step S203 of FIG. 2, step S3103 of FIG. 3A, step S3202, step S3203 of FIG. 3B, and other associated parts in the embodiments related to FIG. 2, FIG. 3A and FIG. 3B, which will not be repeated here.

[0208] In step S3303, the corresponding receiving beam is determined according to the M downlink beams corresponding to the M frequency domain sub-bands.

[0209] The optional implementation of step S3303 can refer to step S204, step S205 of FIG. 2, step S3104 of FIG. 3A, and the optional implementation of step S3204 of FIG. 3B, and other associated parts in the embodiments related to FIG. 2, FIG. 3A and FIG. 3B, which will not be repeated here.

[0210] The communication method related to the embodiments of the present disclosure can comprise at least one of steps S3301-S3303. For example, step S3301 can be implemented as an independent embodiment, step S3302 can be implemented as an independent embodiment, and step S3303 can be implemented as an independent embodiment, but is not limited thereto.

[0211] In some embodiments, the order between any two steps of steps S3301-S3303 can be exchanged or executed simultaneously.

[0212] In some embodiments, steps S3302 and S3303 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0213] In some embodiments, steps S3301 and S3303 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0214] In some embodiments, steps S3301 and S3302 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0215] FIG. 4A is a flow diagram of a beam indication method according to an embodiment of the present disclosure. As shown in FIG. 4A, the embodiment of the present disclosure relates to a beam indication method, which is performed by a network device side, and the above method comprises the following steps:

[0216] In step S4101, indexes of CSI-RSs corresponding to QCL relationships in TCI states are determined, one index is associated with one CSI-RS, one CSI-RS corresponds to N downlink beams of different directions, and one downlink beam corresponds to one frequency domain subband.

[0217] For optional implementation of step S4101, reference can be made to the optional implementation of step S201 of FIG. 2 and other associated parts in the embodiments involved in FIG. 2, which will not be repeated here.

[0218] In step S4102, M frequency domain subbands used for transmitting CSI-RSs are determined.

[0219] For optional implementation of step S4102, reference can be made to the optional implementation of step S201 of FIG. 2 and other associated parts in the embodiments involved in FIG. 2, which will not be repeated here.

[0220] In step S4103, M downlink beams corresponding to the M frequency domain subbands are determined.

[0221] For optional implementation of step S4103, reference can be made to the optional implementation of step S201 of FIG. 2 and other associated parts in the embodiments involved in FIG. 2, which will not be repeated here.

[0222] The communication method involved in the embodiments of the present disclosure can comprise at least one of steps S4101 to S4103. For example, step S4101 can be implemented as an independent embodiment, step S4102 can be implemented as an independent embodiment, and step S4103 can be implemented as an independent embodiment, but is not limited thereto.

[0223] In some embodiments, the order of any two of steps S4101 to S4103 can be exchanged or executed simultaneously.

[0224] In some embodiments, steps S4102 and S4103 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0225] In some embodiments, steps S4101 and S4103 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0226] In some embodiments, steps S4101 and S4102 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0227] FIG. 4B is a flow diagram of a beam indication method according to an embodiment of the present disclosure. As shown in FIG. 4B, the embodiment of the present disclosure relates to a beam indication method, which is performed by the network device side, and the above method comprises the following steps:

[0228] In step S4201, first indication information is transmitted.

[0229] The optional implementation of step S4201 can refer to the optional implementation of step S203 in FIG. 2 and other associated parts in the embodiments involved in FIG. 2, which will not be described here.

[0230] In some embodiments, the network device 102 transmits the first indication information to the terminal 101, but is not limited thereto, and can also transmit the first indication information to other subjects.

[0231] FIG. 4C is a flow diagram of a beam indication method according to an embodiment of the present disclosure. As shown in FIG. 4C, the embodiment of the present disclosure relates to a beam indication method, which is performed by the network device side, and the above method comprises the following steps:

[0232] In step S4301, a first configuration item and / or a second configuration item are configured in the resource configuration of the CSI-RS.

[0233] The optional implementation of step S4301 can refer to the optional implementation of step S203 in FIG. 2 and other associated parts in the embodiments involved in FIG. 2, which will not be described here.

[0234] FIG. 5 is an interaction diagram of a beam indication method according to an embodiment of the present disclosure. As shown in FIG. 5, the embodiment of the present disclosure relates to a beam indication method, which is performed by the network device side, and the above method comprises the following steps:

[0235] In step S501, the network device determines that the QCL relationship in the TCI state corresponds to the index of the CSI-RS, one index is associated with one CSI-RS, one CSI-RS corresponds to N different direction downlink beams, and one downlink beam corresponds to one frequency domain subband.

[0236] The optional implementation of step S501 can refer to step S201 in FIG. 2, the optional implementation of step S4101 in FIG. 4A, and other associated parts in the embodiments related to FIG. 2 and FIG. 4A, which will not be repeated here.

[0237] In step S502, the network device determines M frequency domain subbands for sending the CSI-RS, and determines M downlink beams corresponding to the M frequency domain subbands.

[0238] The optional implementation of step S502 can refer to step S201 in FIG. 2, the optional implementation of steps S4102 and S4103 in FIG. 4A, and other associated parts in the embodiments related to FIG. 2 and FIG. 4A, which will not be repeated here.

[0239] In step S503, the network device sends data to the terminal through the M downlink beams.

[0240] The optional implementation of step S503 can refer to step S201 in FIG. 2, the optional implementation of step S4103 in FIG. 4A, and other associated parts in the embodiments related to FIG. 2 and FIG. 4A, which will not be repeated here.

[0241] In step S504, the terminal determines an index of the CSI-RS corresponding to the QCL relationship in the TCI state, one index is associated with one CSI-RS, one CSI-RS corresponds to N downlink beams of different directions, and one downlink beam corresponds to one frequency domain subband.

[0242] The optional implementation of step S504 can refer to step S201 in FIG. 2, step S202, the optional implementation of step S3102 in FIG. 3A, and other associated parts in the embodiments related to FIG. 2 and FIG. 3A, which will not be repeated here.

[0243] In step S505, the terminal determines M frequency domain subbands for sending the CSI-RS by the network device.

[0244] The optional implementation of step S505 can refer to step S203 in FIG. 2, step S3103 in FIG. 3A, step S3202 and step S3203 in FIG. 3B, and other associated parts in the embodiments related to FIG. 2, FIG. 3A, and FIG. 3B, which will not be repeated here.

[0245] In step S506, the terminal determines a corresponding receiving beam according to M downlink beams corresponding to the M frequency domain subbands.

[0246] The optional implementation of step S506 can refer to the optional implementation of step S204, step S205, step S3104 of FIG. 3A, step S3204 of FIG. 3B, and other associated parts in the embodiments related to FIG. 2, FIG. 3A, and FIG. 3B, which are not described herein.

[0247] The terminal determines a receiving beam for receiving data transmitted through the M downlink beams.

[0248] In some embodiments, the above method can include the method described in the embodiments of the terminal side, network device side, and the like, which are not described herein.

[0249] In some embodiments, the disclosure proposes that the terminal receives a TCI state signal indicated by the base station, determines the corresponding reference signal index according to the QCL association relationship in the TCI state, determines the transmitting beam of the transmitting end based on the reference signal, and selects the corresponding receiving beam based on the transmitting beam. The problem of determining the transmitting beam of the transmitting end is that the terminal cannot determine whether the base station transmits by using a single analog beam or multiple analog beams, and each analog beam corresponds to a sub-band. Therefore, the determination of the transmitting beam scheme is as follows:

[0250] Embodiment 1, assuming that the QCL relationship contained in the TCI state corresponds to a CSI-RS index, and one CSI-RS index is associated with two beams. A k (K is greater than or equal to 1) bit frequency domain index information indication bit is added on the CSI-RS index, where when the bit is zero, it indicates that the beam corresponding to the reference signal indicated by the current TCI state is the beam corresponding to the high frequency part, and when the bit is one, it indicates that the beam corresponding to the reference signal indicated by the current TCI state is the beam corresponding to the low frequency part.

[0251] Embodiment 2, assuming that the QCL relationship contained in the TCI state corresponds to a CSI-RS index, and one CSI-RS index is associated with two beams. A frequency domain position information indication field is added on the basis of the indication information field contained in the current TCI state, which is used to indicate the specific beam associated with the current CSI-RS index.

[0252] In Embodiment 3, it is assumed that the QCL relationship contained in the TCI state corresponds to a CSI-RS index, and one CSI-RS index is associated with two beams. When the gNB configures the CSI-RS resource, the current continuous resource is further indicated by sub-band in RRC signaling. Specifically, in addition to configuring the current CSI-RS frequency domain resource information: startingRB (Starting Resource Block) and nrofRBs (Number of Resource Blocks), the number of frequency domain sub-bands: sub-bandNums also needs to be configured in the RRC signaling, where each sub-band corresponds to an analog beam. Specifically, when the number of sub-bands is configured as 2, it means that the transmitter divides the entire bandwidth into two sub-bands, and each sub-band corresponds to a different analog beam. Moreover, the two sub-bands have the same bandwidth, i.e., the sub-band bandwidth is equal to half of the total bandwidth. At this time, the starting position of sub-band 1 is equal to startingRB by default. The terminal receives all the beams corresponding to the sub-bands respectively.

[0253] In Embodiment 4, on the basis of Embodiment 3, in addition to configuring the current CSI-RS frequency domain resource information: startingRB and nrofRBs, a plurality of frequency domain sub-bands sub-bandNums and corresponding bandwidths or a coefficient sub-bandNumsFactor indicating the width of each sub-band also need to be configured. Specifically, when the number of sub-bands sub-bandNums is 2, two sub-bandNumsFactor parameters also need to be configured, where the sum of the two sub-bandNumsFactor parameters is 1, which can be [1 / 2, 1 / 2], [1 / 3, 2 / 3], etc. At this time, the starting position of sub-band 1 is equal to startingRB by default. The terminal receives all the beams corresponding to the sub-bands respectively.

[0254] In some embodiments, the downlink beam information is indicated by the TCI state. The RRC configures a terminal with a maximum of 128 TCI states, and then the MAC CE activates a maximum of 8 TCI state groups to be mapped to the 3-bit TCI information field in the DCI. In R16, the MAC CE signaling is enhanced, and each TCI state group in the MAC CE can contain a maximum of 2 TCI states. However, the two TCI states are used to indicate the downlink beams of different TRPs (Transmit / Receive Point), so the current scheme cannot indicate the case that one TXRU (Transmitter Receiver Unit) on the same TRP transmits different analog beams in different frequency bands.

[0255] In the embodiments of the present disclosure, part or all of the steps, and optional implementation manners thereof, can be combined with part or all of the steps in other embodiments, or combined with optional implementation manners of other embodiments.

[0256] The embodiments of the present disclosure also propose a device for implementing any of the above methods, for example, a device comprising units or modules for implementing the steps performed by a terminal in any of the above methods. For another example, another device is proposed, comprising units or modules for implementing the steps performed by a network device (such as an access network device, a core network function node, a core network device, etc.) in any of the above methods.

[0257] It should be understood that the division of units or modules in the above device is only a logical functional division, and all or part of them can be integrated into one physical entity, or physically separated. In addition, the units or modules in the device can be implemented in the form of processor calling software: for example, the device includes a processor, the processor is connected with a memory, the memory stores instructions, and the processor calls the instructions stored in the memory to implement any of the above methods or the functions of the units or modules of the device, wherein the processor is, for example, a general processor, such as a central processing unit (CPU) or a microprocessor, and the memory is a memory within the device or a memory outside the device. Alternatively, the units or modules in the device can be implemented in the form of hardware circuit, and the functions of part or all of the units or modules can be implemented by designing the hardware circuit, and the hardware circuit can be understood as one or more processors; for example, in one implementation, the hardware circuit is an application-specific integrated circuit (ASIC), and the functions of part or all of the units or modules are implemented by designing the logical relationship of elements in the circuit; for another example, in another implementation, the hardware circuit is a programmable logic device (PLD), and a field programmable gate array (FPGA) is taken as an example, which can include a large number of logic gate circuits, and the connection relationship between the logic gate circuits is configured by a configuration file, so as to implement the functions of part or all of the units or modules. All units or modules of the above device can be implemented in the form of processor calling software, or all units or modules can be implemented in the form of hardware circuit, or part of the units or modules can be implemented in the form of processor calling software, and the remaining part can be implemented in the form of hardware circuit.

[0258] In the embodiments of the present disclosure, the processor is a circuit with signal processing capability. In one implementation, the processor can be a circuit with instruction reading and running capability, such as a central processing unit (CPU), a microprocessor, a graphics processing unit (GPU) (which can be understood as a microprocessor), a digital signal processor (DSP), or the like. In another implementation, the processor can implement certain functions through a logical relationship of a hardware circuit, and the logical relationship of the hardware circuit is fixed or can be reconfigured. For example, the processor is a hardware circuit implemented by an application-specific integrated circuit (ASIC) or a programmable logic device (PLD), such as an FPGA. In the reconfigurable hardware circuit, the processor loads a configuration document to implement the configuration of the hardware circuit. It can be understood that the processor loads instructions to implement the functions of the above part or all units or modules. In addition, it can also be a hardware circuit designed for artificial intelligence, which can be understood as an ASIC, such as a neural network processing unit (NPU), a tensor processing unit (TPU), a deep learning processing unit (DPU), and the like.

[0259] FIG. 6 is a structural schematic diagram of a terminal according to an embodiment of the present disclosure. As shown in FIG. 6, the terminal 600 can include at least one of a transceiver module 601, a processing module 602, and the like. In some embodiments, the processing module 602 is configured to determine an index of a channel state information reference signal (CSI-RS) corresponding to a quasi co-location (QCL) relationship in a transmission configuration indication (TCI) state, one index is associated with one CSI-RS, one CSI-RS corresponds to N downlink beams of different directions, one downlink beam corresponds to one frequency domain sub-band, and N is an integer greater than 1; determine M frequency domain sub-bands for transmitting the CSI-RS, where M is an integer greater than or equal to 1 and less than or equal to N; and determine a corresponding receiving beam according to M downlink beams corresponding to the M frequency domain sub-bands. Optionally, the transceiver module is configured to perform at least one of the communication steps (for example, step S201, but not limited thereto) of transmitting and / or receiving performed by the terminal 101 in any of the above methods, and details are not described herein again. Optionally, the processing module is configured to perform at least one of the other steps (for example, step S202, step S203, step S204, and step S205, but not limited thereto) performed by the terminal 101 in any of the above methods, and details are not described herein again.

[0260] FIG. 7 is a structural schematic diagram of a network device according to an embodiment of the present disclosure. As shown in FIG. 7, the network device 700 can include at least one of a transceiver module 701, a processing module 702, and the like. In some embodiments, the processing module 702 is configured to determine an index of a CSI-RS corresponding to a QCL relationship in a TCI state, one index is associated with one CSI-RS, one CSI-RS corresponds to N downlink beams of different directions, one downlink beam corresponds to one frequency domain sub-band, and N is an integer greater than 1; determine M frequency domain sub-bands for transmitting the CSI-RS, where M is an integer greater than or equal to 1 and less than or equal to N; and the transceiver module 701 is configured to determine M downlink beams corresponding to the M frequency domain sub-bands. Optionally, the transceiver module is configured to perform at least one of the communication steps (for example, step S201, but not limited thereto) of transmitting and / or receiving performed by the network device 102 in any of the above methods, and details are not described herein again. Optionally, the processing module is configured to perform at least one of the other steps (for example, step S202, step S203, step S204, and step S205, but not limited thereto) performed by the network device 102 in any of the above methods, and details are not described herein again.

[0261] In some embodiments, the transceiver module can include a transmitting module and / or a receiving module, which can be separate or integrated together. Optionally, the transceiver module can be mutually replaced with a transceiver.

[0262] In some embodiments, the processing module can be one module, or can include a plurality of sub-modules. Optionally, the plurality of sub-modules respectively perform all or part of the steps required to be performed by the processing module. Optionally, the processing module can be mutually replaced with the processor.

[0263] FIG. 8A is a structural schematic diagram of a communication device 8100 according to an embodiment of the present disclosure. The communication device 8100 can be a network device (for example, an access network device, a core network device, etc.), a terminal (for example, a user equipment, etc.), a chip, a chip system, or a processor supporting the network device to implement any of the above methods, or a chip, a chip system, or a processor supporting the terminal to implement any of the above methods. The communication device 8100 can be used to implement the methods described in the above method embodiments, and details can be referred to the descriptions in the above method embodiments.

[0264] As shown in FIG. 8A, the communication device 8100 includes one or more processors 8101. The processor 8101 can be a general-purpose processor or a special-purpose processor, for example, a baseband processor or a central processing unit. The baseband processor can be used to process communication protocols and communication data, and the central processing unit can be used to control the communication device (for example, a base station, a baseband chip, a terminal device, a terminal device chip, a DU or a CU, etc.), execute programs, and process data of the programs. Optionally, the communication device 8100 is used to execute any of the above methods. Optionally, the one or more processors 8101 are used to call instructions to enable the communication device 8100 to execute any of the above methods.

[0265] In some embodiments, the communication device 8100 further includes one or more transceivers 8102. When the communication device 8100 includes the one or more transceivers 8102, the transceiver 8102 performs at least one of the communication steps (for example, step S201, but not limited to this) in the above method, and the processor 8101 performs at least one of the other steps (for example, step S202, step S203, step S204, step S205, but not limited to this). In an optional embodiment, the transceiver can include a receiver and / or a transmitter, which can be separate or integrated together. Optionally, the terms of transceiver, transceiving unit, transceiver, transceiving circuit, interface circuit, interface, etc. can be mutually replaced, and the terms of transmitter, transmitting unit, transmitter, transmitting circuit, etc. can be mutually replaced, and the terms of receiver, receiving unit, receiver, receiving circuit, etc. can be mutually replaced.

[0266] In some embodiments, the communication device 8100 further includes one or more memories 8103 for storing data. Alternatively, all or part of the memories 8103 can be external to the communication device 8100. In optional embodiments, the communication device 8100 can include one or more interface circuits 8104. Optionally, the interface circuit 8104 is connected to the memory 8103, and the interface circuit 8104 can be used to receive data from the memory 8103 or other devices, and can be used to send data to the memory 8103 or other devices. For example, the interface circuit 8104 can read data stored in the memory 8103 and send the data to the processor 8101.

[0267] The communication device 8100 described in the above embodiments can be a network device or a terminal, but the scope of the communication device 8100 described in the present disclosure is not limited thereto, and the structure of the communication device 8100 can not be limited by Figure 8A. The communication device can be a standalone device or can be part of a larger device. For example, the communication device can be: 1) a standalone integrated circuit (IC), or a chip, or a chip system or subsystem; (2) a set of one or more ICs, which can optionally include a storage component for storing data, programs; (3) an ASIC, such as a modem; (4) a module that can be embedded in other devices; (5) a receiver, a terminal device, a smart terminal device, a cellular phone, a wireless device, a handset, a mobile unit, a vehicle-mounted device, a network device, a cloud device, an artificial intelligence device, etc.; (6) other devices, etc.

[0268] Figure 8B is a structural schematic diagram of a chip 8200 according to an embodiment of the present disclosure. For the case where the communication device 8100 is a chip or a chip system, the structural schematic diagram of the chip 8200 shown in Figure 8B can be referred to, but is not limited thereto.

[0269] The chip 8200 includes one or more processors 8201. The chip 8200 is configured to execute any of the above methods.

[0270] In some embodiments, the chip 8200 further includes one or more interface circuits 8202. Optionally, the terms interface circuit, interface, transceiver pin, etc. can be replaced by each other. In some embodiments, the chip 8200 further includes one or more memories 8203 for storing data. Optionally, all or part of the memories 8203 can be external to the chip 8200. Optionally, the interface circuit 8202 is connected to the memory 8203, and the interface circuit 8202 can be used to receive data from the memory 8203 or other devices, and the interface circuit 8202 can be used to send data to the memory 8203 or other devices. For example, the interface circuit 8202 can read data stored in the memory 8203 and send the data to the processor 8201.

[0271] In some embodiments, the interface circuit 8202 performs at least one of the communication steps (for example, step S201, but not limited thereto) of transmitting and / or receiving and / or the like in the above method. The interface circuit 8202 performing the communication steps of transmitting and / or receiving and / or the like in the above method refers to, for example, the interface circuit 8202 performing data interaction between the processor 8201, the chip 8200, the memory 8203, or a transceiver device. In some embodiments, the processor 8201 performs at least one of the other steps (for example, step S202, step S203, step S204, step S205, but not limited thereto).

[0272] The various modules and / or devices described in each of the embodiments of the virtual device, the physical device, the chip, and / or the like can be combined or separated according to the circumstances. Optionally, part or all of the steps can also be performed by a plurality of modules and / or devices in cooperation, which is not limited here.

[0273] The disclosure also proposes a storage medium, and the above storage medium stores instructions, which, when executed on the communication device 8100, cause the communication device 8100 to perform any of the above methods. Optionally, the above storage medium is an electronic storage medium. Optionally, the above storage medium is a computer readable storage medium, but is not limited thereto, and it can also be a storage medium readable by other devices. Optionally, the above storage medium can be a non-transitory storage medium, but is not limited thereto, and it can also be a transitory storage medium.

[0274] The disclosure also proposes a program product, and the above program product is executed by the communication device 8100, so that the communication device 8100 performs any of the above methods. Optionally, the above program product is a computer program product.

[0275] The disclosure also proposes a computer program, which, when executed on a computer, causes the computer to perform any of the above methods.

Claims

1. A beam pointing method, characterized in that, The method is performed by a terminal, and the method comprises: determining an index corresponding to a channel state information reference signal (CSI-RS) in a quasi co-location (QCL) relationship in a transmission configuration indication (TCI) state, one index being associated with one CSI-RS, one CSI-RS corresponding to N downlink beams of different directions, one downlink beam corresponding to one frequency domain sub-band, N being an integer greater than 1; determining M frequency domain sub-bands in which a network device transmits the CSI-RS, wherein M is an integer greater than or equal to 1 and less than or equal to N; determining a corresponding receiving beam according to M downlink beams corresponding to the M frequency domain sub-bands.

2. The method of claim 1, wherein, The determination of the M frequency domain sub-bands in which the network device transmits the CSI-RS comprises: determining first indication information, the first indication information comprising M frequency domain sub-band positions indicated by the network device; determining the M frequency domain sub-bands according to the first indication information.

3. The method of claim 2, wherein, The first indication information is included in at least one of the following: indication information field of the TCI state; the QCL relationship; the index; a first message transmitted by the network device.

4. The method of claim 1, wherein, The determination of the M frequency domain sub-bands in which the network device transmits the CSI-RS comprises: if resource configuration of the CSI-RS comprises a first configuration item, determining that M is equal to N, the first configuration item being used to indicate a total number of frequency domain sub-bands.

5. The method of claim 4, wherein, The method further comprises: determining a frequency domain range corresponding to each frequency domain sub-band according to a starting resource block, a number of resource blocks, and information that bandwidths of the frequency domain sub-bands are the same in the resource configuration.

6. The method of claim 4, wherein, The method further comprises: if the resource configuration further comprises a second configuration item, determining a frequency domain range corresponding to each frequency domain sub-band according to a starting resource block, a number of resource blocks, and the second configuration item in the resource configuration, wherein the second configuration item is used to indicate bandwidth information corresponding to each frequency domain sub-band respectively.

7. A beam pointing method, characterized in that, The method is performed by a network device, and the method comprises: determining an index corresponding to a channel state information reference signal (CSI-RS) in a quasi co-location (QCL) relationship in a transmission configuration indication (TCI) state, one index being associated with one CSI-RS, one CSI-RS corresponding to N downlink beams of different directions, one downlink beam corresponding to one frequency domain sub-band, N being an integer greater than 1; determining M frequency domain sub-bands for transmitting the CSI-RS, wherein M is an integer greater than or equal to 1 and less than or equal to N; determining M downlink beams corresponding to the M frequency domain sub-bands.

8. The method of claim 7, wherein, The method further comprises: transmitting, to the terminal, first indication information, the first indication information comprising M frequency domain sub-band positions indicated by the network device.

9. The method of claim 8, wherein, The first indication information is included in at least one of the following: indication information field of the TCI state; the QCL relationship; the index; a first message transmitted by the network device.

10. The method of claim 7, wherein, The method further comprises: configuring a first configuration item in resource configuration of the CSI-RS, the first configuration item being a total number of frequency domain sub-bands, the resource configuration comprising the first configuration item being used to indicate that M is equal to N.

11. The method of claim 10, wherein, The method further comprises: configuring a second configuration item in resource configuration of the CSI-RS, the second configuration item being used to indicate bandwidth information corresponding to each frequency domain sub-band respectively. ​ 12. The method of claim 10, wherein, The method further includes: The resource configuration of the CSI-RS does not include a second configuration item for indicating bandwidth information corresponding to each frequency domain sub-band, and the resource configuration without the second configuration item is used to indicate that the bandwidths of the frequency domain sub-bands are the same.

13. A terminal, characterized by Comprise: The processing module is configured to determine an index of a channel state information reference signal (CSI-RS) corresponding to a quasi co-location (QCL) relationship in a transmission configuration indication (TCI) state, one index being associated with one CSI-RS, one CSI-RS corresponding to N downlink beams with different directions, one downlink beam corresponding to one frequency domain sub-band, and N being an integer greater than 1; determine M frequency domain sub-bands for transmitting the CSI-RS, where M is an integer greater than or equal to 1 and less than or equal to N; and determine a corresponding receiving beam according to M downlink beams corresponding to the M frequency domain sub-bands.

14. A network device, comprising: Comprise: The processing module is configured to determine an index of a channel state information reference signal (CSI-RS) corresponding to a quasi co-location (QCL) relationship in a transmission configuration indication (TCI) state, one index being associated with one CSI-RS, one CSI-RS corresponding to N downlink beams with different directions, one downlink beam corresponding to one frequency domain sub-band, and N being an integer greater than 1; determine M frequency domain sub-bands for transmitting the CSI-RS, where M is an integer greater than or equal to 1 and less than or equal to N; The transceiver module is configured to determine M downlink beams corresponding to the M frequency domain sub-bands.

15. A terminal, characterized by Comprise: One or more processors; A memory coupled to the processors, the memory having stored thereon executable instructions that, when executed by the processors, cause the beam indication method of any of claims 1-6 to be performed.

16. A network device, comprising: Comprise: One or more processors; A memory coupled to the processors, the memory having stored thereon executable instructions that, when executed by the processors, cause the beam indication method of any of claims 7-12 to be performed.

17. A communication system, characterized by Comprise a terminal and a network device, wherein the terminal is configured to implement the beam indication method of any of claims 1-6, and the network device is configured to implement the beam indication method of any of claims 7-12.

18. A storage medium, the storage medium storing instructions, wherein, The instructions, when executed on a communication device, cause the communication device to perform the beam indication method of any of claims 1-12.

19. A computer program product comprising computer programs and / or instructions, characterized in that, The computer program and / or instructions, when executed on a communication device, implement the beam indication method of any of claims 1-12.

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