Beam indication method, device, and storage medium

Abstract

Embodiments of the present invention relate to a beam indication method, a device, and a storage medium. The method comprises: receiving first information sent by a first network device, wherein the first information triggers a terminal device to execute handover to a target cell, and the first network device is a network device corresponding to a current serving cell of the terminal device; determining a first transmission configuration indication (TCI) state on the basis of the first information, wherein the first TCI state indicates a first beam, and the first beam is a beam used in the process of the terminal device executing the handover to the target cell; and determining a second TCI state, wherein the second TCI state indicates a second beam, the second beam is a beam used by the terminal device after handover to the target cell, and the second TCI state is the same as or different from the first TCI state. In this way, the terminal device can determine the second beam used after handover to the target cell, so that the terminal device hands over to the target cell and communicates by means of the target cell, thereby improving the handover success rate and the communication efficiency.

Description

Beam indication method, device and storage medium Technical Field

[0001] The present disclosure relates to the field of communication technologies, and in particular to a beam indication method, device, and storage medium. Background Art

[0002] In wireless communication systems, the 3rd Generation Partnership Project (3GPP) introduced Layer 1 (L1) or Layer 2 (L2)-triggered mobility (LTM) to reduce handover latency and signaling overhead. LTM allows network equipment to configure multiple candidate cells (or candidate cell groups) for a terminal device and control handover of the terminal device through L1 or L2 signaling.

[0003] Summary of the Invention

[0004] The embodiments of the present disclosure provide a beam indication method, device, and storage medium.

[0005] According to a first aspect of an embodiment of the present disclosure, a beam indication method is proposed, the method including:

[0006] Receiving first information sent by a first network device, where the first information triggers a terminal device to perform a handover to a target cell, where the first network device is a network device corresponding to a current serving cell of the terminal device;

[0007] Determine a first transmission configuration indication TCI state according to the first information, where the first TCI state indicates a first beam, where the first beam is a beam used by the terminal device when performing a handover to the target cell;

[0008] Determine a second TCI state, where the second TCI state indicates a second beam, and the second beam is the beam used by the terminal device after switching to the target cell. The second TCI state is the same as or different from the first TCI state.

[0009] According to a second aspect of an embodiment of the present disclosure, a beam indication method is proposed, the method including:

[0010] A first message is sent to a terminal device, where the first message triggers the terminal device to perform a switch to a target cell, and the first network device is a network device corresponding to a current serving cell of the terminal device.

[0011] According to a third aspect of an embodiment of the present disclosure, a beam indication method is proposed, the method including:

[0012] Send fourth information to the terminal device, where the fourth information is used to determine that the terminal device has successfully switched to the target cell, and the second network device is the network device corresponding to the target cell.

[0013] According to a fourth aspect of an embodiment of the present disclosure, a terminal device is provided, including:

[0014] a transceiver module configured to receive first information sent by a first network device, where the first information triggers the terminal device to perform a handover to a target cell, the first network device being a network device corresponding to a current serving cell of the terminal device;

[0015] The processing module is configured to determine a first transmission configuration indication TCI state based on the first information, the first TCI state indicating a first beam, and the first beam is the beam used by the terminal device when performing a handover to the target cell; and determine a second TCI state, the second TCI state indicating a second beam, and the second beam is the beam used by the terminal device after switching to the target cell, and the second TCI state is the same as or different from the first TCI state.

[0016] According to a fifth aspect of an embodiment of the present disclosure, a first network device is provided, including:

[0017] The transceiver module is configured to send first information to the terminal device, where the first information triggers the terminal device to perform a switch to a target cell, and the first network device is a network device corresponding to the current serving cell of the terminal device.

[0018] According to a sixth aspect of an embodiment of the present disclosure, a second network device is provided, including:

[0019] The transceiver module is configured to send fourth information to the terminal device, where the fourth information is used to determine that the terminal device has successfully switched to the target cell, and the second network device is the network device corresponding to the target cell.

[0020] According to a seventh aspect of an embodiment of the present disclosure, a communication device is proposed, comprising: one or more processors; wherein the communication device can be used to execute an optional implementation of the first aspect, the second aspect, or the third aspect.

[0021] According to an eighth aspect of an embodiment of the present disclosure, a storage medium is proposed, which stores instructions. When the instructions are executed on a communication device, the communication device executes the method described in the optional implementation of the first aspect, the second aspect or the third aspect.

[0022] According to the ninth aspect of an embodiment of the present disclosure, a communication system is proposed, which may include: a terminal device, a first network device, and a second network device; wherein, the terminal device is configured to execute the method described in the optional implementation manner of the first aspect, the first network device is configured to execute the method described in the optional implementation manner of the second aspect, and the second network device is configured to execute the method described in the optional implementation manner of the third aspect.

[0023] The technical solution provided by the embodiment of the present disclosure may include the following beneficial effects: receiving first information sent by a first network device, the first information triggering the terminal device to perform a switch to a target cell, the first network device being the network device corresponding to the current serving cell of the terminal device; determining a first transmission configuration indication TCI state based on the first information, the first TCI state indicating a first beam, the first beam being the beam used by the terminal device in performing a switch to the target cell; determining a second TCI state, the second TCI state indicating a second beam, the second beam being the beam used by the terminal device after switching to the target cell, the second TCI state being the same as or different from the first TCI state. In this way, the terminal device can determine the second beam to be used after switching to the target cell, so that the terminal device switches to the target cell and communicates through the target cell, thereby improving the switching success rate and communication efficiency.

[0024] In some embodiments of the present disclosure, a terminal device needs to use a corresponding beam to transmit signals (such as data or signaling) after switching to a target cell. Therefore, how to determine the transmission beam becomes an urgent problem to be solved.

[0025] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following drawings required for describing the embodiments are introduced. The following drawings are merely some embodiments of the present disclosure and do not impose specific limitations on the protection scope of the present disclosure.

[0027] FIG1A is a schematic diagram showing the architecture of a communication system according to an embodiment of the present disclosure.

[0028] FIG1B is a schematic diagram showing configuration information according to an embodiment of the present disclosure.

[0029] FIG2A is an interactive schematic diagram illustrating a beam indication method according to an embodiment of the present disclosure.

[0030] FIG2B is an interactive schematic diagram illustrating a beam indication method according to an embodiment of the present disclosure.

[0031] FIG2C is an interactive schematic diagram illustrating a beam indication method according to an embodiment of the present disclosure.

[0032] FIG3A is a schematic flow chart of a beam indication method according to an embodiment of the present disclosure.

[0033] FIG3B is a flow chart illustrating a beam indication method according to an embodiment of the present disclosure.

[0034] FIG3C is a flow chart illustrating a beam indication method according to an embodiment of the present disclosure.

[0035] FIG4A is a schematic flow chart of a beam indication method according to an embodiment of the present disclosure.

[0036] FIG4B is a flow chart illustrating a beam indication method according to an embodiment of the present disclosure.

[0037] FIG4C is a flow chart illustrating a beam indication method according to an embodiment of the present disclosure.

[0038] FIG5A is a schematic flow chart of a beam indication method according to an embodiment of the present disclosure.

[0039] FIG5B is a flow chart illustrating a beam indication method according to an embodiment of the present disclosure.

[0040] FIG5C is a flow chart illustrating a beam indication method according to an embodiment of the present disclosure.

[0041] FIG6 is a schematic flow chart of a beam indication method according to an embodiment of the present disclosure.

[0042] FIG7A is a schematic structural diagram of a terminal device according to an embodiment of the present disclosure.

[0043] FIG7B is a schematic structural diagram of a first network device according to an embodiment of the present disclosure.

[0044] FIG7C is a schematic structural diagram of a second network device according to an embodiment of the present disclosure.

[0045] FIG8A is a schematic structural diagram of a communication device according to an embodiment of the present disclosure.

[0046] FIG8B is a schematic structural diagram of a chip according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0047] The embodiments of the present disclosure provide a beam indication method, device, and storage medium.

[0048] In a first aspect, an embodiment of the present disclosure provides a beam indication method, the method comprising:

[0049] Receiving first information sent by a first network device, where the first information triggers a terminal device to perform a handover to a target cell, where the first network device is a network device corresponding to a current serving cell of the terminal device;

[0050] Determine a first transmission configuration indication TCI state according to the first information, where the first TCI state indicates a first beam, where the first beam is a beam used by the terminal device when performing a handover to the target cell;

[0051] Determine a second TCI state, where the second TCI state indicates a second beam, and the second beam is the beam used by the terminal device after switching to the target cell. The second TCI state is the same as or different from the first TCI state.

[0052] In the above embodiment, the terminal device can determine the second beam to be used after switching to the target cell, so that the terminal device switches to the target cell and communicates through the target cell, thereby improving the switching success rate and communication efficiency.

[0053] In combination with some embodiments of the first aspect, in some embodiments, the first information includes a first identifier and / or a second identifier, the first identifier is the cell identifier of the target cell, and the second identifier is used to determine the first TCI state.

[0054] In the above embodiment, the terminal device can determine the target cell for switching and the first TCI state based on the first information, thereby improving the flexibility of beam indication during the switching process.

[0055] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0056] Receive the second information sent by the first network device, the second information includes the first TCI set and the parameters of the candidate cell pre-configured by the first network device for the terminal device, the first TCI set includes the TCI status corresponding to the candidate cell, and the candidate cell is the cell configured by the first network device for the terminal device to perform beam measurement.

[0057] In the above embodiment, the first TCI set can be preconfigured through the second information, thereby improving the flexibility of handover control.

[0058] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0059] Receive the third information sent by the first network device, where the third information is the TCI status corresponding to one or more candidate cells in the first TCI set activated by the terminal device.

[0060] In the above embodiment, the TCI state can be activated through the third information, thereby further improving the flexibility of switching control.

[0061] In conjunction with some embodiments of the first aspect, in some embodiments, the first TCI state is any one of the following:

[0062] at least one of the TCI states corresponding to the target cell in the first TCI set;

[0063] At least one of the TCI states in the first TCI set that is in an activated state and corresponds to the target cell.

[0064] In the above embodiment, the first TCI state used in the handover process can be flexibly determined, so that the handover process can be flexibly controlled.

[0065] In conjunction with some embodiments of the first aspect, in some embodiments, the second TCI state is any one of the following:

[0066] the first TCI state;

[0067] At least one TCI state in the first TCI set that is activated and corresponds to the target cell is different from the first TCI state.

[0068] In the above embodiment, the first TCI state used after the switching can be flexibly determined, so that the signal transmission after the switching can be flexibly controlled.

[0069] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0070] Receive fourth information sent by a second network device, where the second network device is the network device corresponding to the target cell, and the fourth information is used to determine whether the terminal device has successfully switched to the target cell.

[0071] In the above embodiment, the fourth information can indicate that the terminal device has successfully switched to the target cell, thereby improving the switching reliability.

[0072] In conjunction with some embodiments of the first aspect, in some embodiments,

[0073] The fourth information is the first scheduling new transmission of the terminal device on the target cell; or

[0074] The fourth information is preset information, and the preset information is transmitted on the physical downlink shared channel PDSCH scheduled for the first time by the target cell.

[0075] In the above embodiment, any of the above fourth information can be used to indicate that the terminal device has successfully switched to the target cell, thereby improving the flexibility of switching control.

[0076] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0077] Receive fifth information sent by the second network device, where the fifth information instructs the terminal device to deactivate a third TCI state, where the third TCI state is all or part of the TCI states in the first TCI set.

[0078] In the above embodiment, the third TCI state can be deactivated through the fifth information, thereby reducing the TCI states activated by the terminal device and reducing the power consumption of the terminal device.

[0079] In conjunction with some embodiments of the first aspect, in some embodiments, the TCI state includes a quasi-co-located QCL source, and the QCL source includes at least one of the following:

[0080] Synchronization signal block SSB of the candidate cell;

[0081] The channel state information reference signal CSI-RS of the candidate cell.

[0082] In the above embodiment, SSB and / or CSI-RS can be used as QCL sources, and beam indication can be performed flexibly.

[0083] In conjunction with some embodiments of the first aspect, in some embodiments,

[0084] The first TCI set is the union of the second TCI sets of each candidate cell, and the second TCI set is the TCI set of the candidate cell itself; or

[0085] The first TCI set includes at least one TCI identifier, and one TCI identifier corresponds to one TCI state in the second TCI set.

[0086] In the above embodiment, the first TCI set is associated with the second TCI set of the candidate cell, so that the first TCI set used for switching can be flexibly implemented.

[0087] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0088] After determining that the terminal device switches to the target cell, maintaining the fourth TCI state in an activated state, the fourth TCI state includes any one of the following:

[0089] the first TCI state;

[0090] a TCI state in the first TCI set that is activated and corresponds to the target cell;

[0091] The TCI state in the first TCI set is in an activated state.

[0092] In the above embodiment, the terminal device can flexibly control the fourth TCI state to remain activated, thereby improving the flexibility of beam indication based on the TCI state.

[0093] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0094] Receive sixth information sent by the second network device, where the sixth information indicates a fifth TCI state, and the fifth TCI state is the TCI state of the target cell itself.

[0095] In the above embodiment, the terminal device can activate the fifth TCI state according to the instruction of the second network device, thereby improving the flexibility of beam indication.

[0096] In combination with some embodiments of the first aspect, in some embodiments, the sixth information is used to instruct the terminal device to activate the fifth TCI state and deactivate the second TCI state.

[0097] In this way, the target cell can deactivate the second TCI state and activate the fifth TCI state, further improving the flexibility of beam indication.

[0098] In combination with some embodiments of the first aspect, in some embodiments, the manner in which the terminal device switches to the target cell is based on switching without random access.

[0099] In the above embodiment, the success rate and communication efficiency of the terminal device based on non-random access switching can be improved.

[0100] In a second aspect, an embodiment of the present disclosure provides a beam indication method, the method comprising:

[0101] A first message is sent to a terminal device, where the first message triggers the terminal device to perform a switch to a target cell, and the first network device is a network device corresponding to a current serving cell of the terminal device.

[0102] In the above embodiment, the first network device can instruct the terminal device to determine the second beam to be used after switching to the target cell, so that the terminal device switches to the target cell and communicates through the target cell, thereby improving the switching success rate and communication efficiency.

[0103] In combination with some embodiments of the second aspect, in some embodiments, the first information includes a first identifier and / or a second identifier, the first identifier is the cell identifier of the target cell, the second identifier is used to determine a first transmission configuration indication TCI state, the first TCI state indicates a first beam, and the first beam is the beam used by the terminal device after switching to the target cell.

[0104] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes:

[0105] Send second information to the terminal device, the second information including the first TCI set and the parameters of the candidate cell pre-configured by the first network device for the terminal device, the first TCI set including the TCI status corresponding to the candidate cell, and the candidate cell being the cell configured by the first network device for beam measurement for the terminal device.

[0106] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes:

[0107] Send third information to the terminal device, where the third information is for the terminal device to activate the TCI status corresponding to one or more candidate cells in the first TCI set.

[0108] In conjunction with some embodiments of the second aspect, in some embodiments, the first TCI state is any one of the following:

[0109] at least one of the TCI states corresponding to the target cell in the first TCI set;

[0110] At least one of the TCI states in the first TCI set that is in an activated state and corresponds to the target cell.

[0111] In combination with some embodiments of the second aspect, in some embodiments, the terminal device determines the second beam through a second TCI state, where the second beam is the beam used by the terminal device after switching to the target cell; the second TCI state is any one of the following:

[0112] the first TCI state;

[0113] At least one TCI state in the first TCI set that is activated and corresponds to the target cell is different from the first TCI state.

[0114] In conjunction with some embodiments of the second aspect, in some embodiments, the TCI state includes a quasi-co-located QCL source, and the QCL source includes at least one of the following:

[0115] Synchronization signal block SSB of the candidate cell;

[0116] The channel state information reference signal CSI-RS of the candidate cell.

[0117] In conjunction with some embodiments of the second aspect, in some embodiments,

[0118] The first TCI set is the union of the second TCI sets of each candidate cell, and the second TCI set is the TCI set of the candidate cell itself; or

[0119] The first TCI set includes at least one TCI identifier, and one TCI identifier corresponds to one TCI state in the second TCI set.

[0120] In combination with some embodiments of the second aspect, in some embodiments, the manner in which the terminal device switches to the target cell is based on switching without random access.

[0121] In a third aspect, an embodiment of the present disclosure provides a beam indication method, the method comprising:

[0122] Send fourth information to the terminal device, where the fourth information is used to determine that the terminal device has successfully switched to the target cell, and the second network device is the network device corresponding to the target cell.

[0123] In the above embodiment, in this way, the second network device can instruct the terminal device to successfully switch to the target cell, thereby improving the switching success rate and communication efficiency.

[0124] In conjunction with some embodiments of the third aspect, in some embodiments,

[0125] The fourth information is the first scheduling new transmission of the terminal device on the target cell; or

[0126] The fourth information is preset information, and the preset information is transmitted on the physical downlink shared channel PDSCH scheduled for the first time by the target cell.

[0127] In conjunction with some embodiments of the third aspect, in some embodiments, the method further includes:

[0128] Send fifth information to the terminal device, the fifth information instructing the terminal device to deactivate the third TCI state, the third TCI state is all or part of the TCI state in the first TCI set, the first TCI set includes the TCI state corresponding to the candidate cell, and the candidate cell is the cell configured by the first network device for the terminal device to perform beam measurement.

[0129] In conjunction with some embodiments of the third aspect, in some embodiments, the TCI state includes a quasi-co-located QCL source, and the QCL source includes at least one of the following:

[0130] Synchronization signal block SSB of the candidate cell;

[0131] The channel state information reference signal CSI-RS of the candidate cell.

[0132] In conjunction with some embodiments of the third aspect, in some embodiments,

[0133] The first TCI set is the union of the second TCI sets of each candidate cell, and the second TCI set is the TCI set of the candidate cell itself; or

[0134] The first TCI set includes at least one TCI identifier, and one TCI identifier corresponds to one TCI state in the second TCI set.

[0135] In conjunction with some embodiments of the third aspect, in some embodiments, the method further includes:

[0136] Send sixth information to the terminal device, where the sixth information indicates a fifth TCI state, and the fifth TCI state is the TCI state of the target cell itself.

[0137] In combination with some embodiments of the third aspect, in some embodiments, the sixth information is used to instruct the terminal device to activate the fifth TCI state and deactivate the second TCI state.

[0138] In combination with some embodiments of the third aspect, in some embodiments, the manner in which the terminal device switches to the target cell is based on switching without random access.

[0139] In a fourth aspect, an embodiment of the present disclosure proposes a terminal device, which may include at least one of a transceiver module and a processing module; wherein the terminal device can be used to execute the optional implementation method of the first aspect.

[0140] In a fifth aspect, an embodiment of the present disclosure proposes a first network device, which may include at least one of a transceiver module and a processing module; wherein the first network device can be used to execute the optional implementation method of the second aspect.

[0141] In a sixth aspect, an embodiment of the present disclosure proposes a second network device, which may include at least one of a transceiver module and a processing module; wherein the second network device can be used to execute the optional implementation method of the third aspect.

[0142] In a seventh aspect, an embodiment of the present disclosure proposes a communication device, which may include: one or more processors; wherein the communication device can be used to execute an optional implementation of the first aspect, the second aspect or the third aspect.

[0143] In an eighth aspect, an embodiment of the present disclosure proposes a storage medium storing instructions, which, when executed on a communication device, enables the communication device to execute the method described in the optional implementation of the first aspect, the second aspect, or the third aspect.

[0144] In the ninth aspect, an embodiment of the present disclosure proposes a communication system, which may include: a terminal device, a first network device and a second network device; wherein, the terminal device is configured to execute the method described in the optional implementation manner of the first aspect, the first network device is configured to execute the method described in the optional implementation manner of the second aspect, and the second network device is configured to execute the method described in the optional implementation manner of the third aspect.

[0145] In a tenth aspect, an embodiment of the present disclosure proposes a program product, which, when executed by a communication device, enables the communication device to execute the method described in the optional implementation manner of the first aspect, the second aspect, or the third aspect.

[0146] In an eleventh aspect, an embodiment of the present disclosure proposes a computer program, which, when executed on a computer, enables the computer to execute the method described in the optional implementation of the first aspect, the second aspect, or the third aspect.

[0147] In a twelfth aspect, an embodiment of the present disclosure provides a chip or a chip system, wherein the chip or chip system includes a processing circuit configured to execute the method described in the optional implementation of the first aspect, the second aspect, or the third aspect.

[0148] It is understandable that the above-mentioned terminal device, first network device, second network device, communication device, communication system, storage medium, program product, computer program, chip or chip system can be used to perform the method proposed in the embodiment of the present disclosure. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects of the corresponding method and will not be repeated here.

[0149] The present disclosure provides a beam pointing method, device, and storage medium. In some embodiments, the terms "beam pointing method," "information processing method," and "communication method" are interchangeable; "beam pointing device," "information processing device," "communication device," and "communication equipment" are interchangeable; and "information processing system," "communication system," and "communication system" are interchangeable.

[0150] The embodiments of the present disclosure are not exhaustive and are merely illustrative of some embodiments, and are not intended to be a specific limitation on the scope of protection of the present disclosure. In the absence of contradiction, each step in a certain embodiment can be implemented as an independent embodiment, and the steps can be arbitrarily combined. For example, a solution after removing some steps in a certain embodiment can also be implemented as an independent embodiment, and the order of the steps in a certain embodiment can be arbitrarily exchanged. In addition, the optional implementation methods in a certain embodiment can be arbitrarily combined; in addition, the embodiments can be arbitrarily combined. For example, some or all steps of different embodiments can be arbitrarily combined, and a certain embodiment can be arbitrarily combined with the optional implementation methods of other embodiments.

[0151] In each embodiment of the present disclosure, unless otherwise specified or provided for by logic, the terms and / or descriptions between the embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form a new embodiment based on their inherent logical relationships.

[0152] The terms used in the embodiments of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure.

[0153] In the embodiments of the present disclosure, unless otherwise specified, elements expressed in the singular, such as "a", "an", "the", "above", "said", "the", "the", etc., may mean "one and only one", or "one or more", "at least one", etc. For example, when using articles such as "a", "an", "the" in English in translation, the noun following the article may be understood as a singular expression or a plural expression.

[0154] In some embodiments, "plurality" may refer to two or more.

[0155] In some embodiments, the terms "at least one," "one or more," "a plurality of," "multiple," etc. may be used interchangeably.

[0156] In some embodiments, descriptions such as "at least one of A and B," "A and / or B," "A in one case, B in another case," or "in response to one case A, in response to another case B" may include the following technical solutions depending on the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed); and in some embodiments, A and B (both A and B are executed). The above is also applicable when there are more branches such as A, B, and C.

[0157] In some embodiments, "A or B" and other descriptions may include the following technical solutions depending on the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed). The above is also applicable when there are more branches such as A, B, C, etc.

[0158] The prefixes such as "first" and "second" in the embodiments of the present disclosure are only used to distinguish different description objects and do not constitute any restriction on the position, order, priority, quantity or content of the description objects. For the statement of the description object, please refer to the description in the context of the claims or embodiments, and no unnecessary restriction should be constituted due to the use of prefixes. For example, if the description object is a "field", the ordinal number before the "field" in the "first field" and the "second field" does not limit the position or order between the "fields". "First" and "second" do not limit whether the "fields" they modify are in the same message, nor do they limit the order of the "first field" and the "second field". For another example, if the description object is a "level", the ordinal number before the "level" in the "first level" and the "second level" does not limit the priority between the "levels". For another example, the number of description objects is not limited by the ordinal number and can be one or more. Taking "first device" as an example, the number of "devices" can be one or more. In addition, the objects modified by different prefixes can be the same or different. For example, if the description object is "device", then the "first device" and the "second device" can be the same device or different devices, and their types can be the same or different; for another example, if the description object is "information", then the "first information" and the "second information" can be the same information or different information, and their contents can be the same or different.

[0159] In some embodiments, “including A,” “comprising A,” “used to indicate A,” and “carrying A” can be interpreted as directly carrying A or indirectly indicating A.

[0160] In some embodiments, terms such as "in response to...", "in response to determining...", "in the case of...", "at the time of...", "when...", "if...", "if...", etc. can be used interchangeably.

[0161] In some embodiments, terms such as "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 less than", and "above" can be replaced with each other, and terms such as "less than", "less than or equal to", "not greater than", "less than", "less than or equal to", "not more than", "lower than", "lower than or equal to", "not higher than", and "below" can be replaced with each other.

[0162] In some embodiments, devices and the like can be interpreted as physical or virtual, and their names are not limited to those described in the embodiments. Terms such as "device," "equipment," "device," "circuit," "network element," "node," "function," "unit," "section," "system," "network," "chip," "chip system," "entity," and "subject" can be used interchangeably.

[0163] In some embodiments, "network" can be interpreted as devices included in the network (eg, network equipment, access network equipment, core network equipment, etc.).

[0164] In some embodiments, the network device may include at least one of an access network device and a core network device.

[0165] In some embodiments, the terms "Access Network Device (AN Device)", "Radio Access Network Device (RAN Device)", "Base Station (BS)", "Radio Base Station (Radio Base Station)", "Fixed Station (Fixed Station)", "Node (Node)", "Access Point (Access Point)", "Transmission Point (TP)", "Reception Point (RP)", "Transmission and / or Reception Point (TRP))", "Panel (Panel)", "Antenna Panel (Antenna Panel)", "Antenna Array (Antenna Array)" "Cell (Cell)", "Macro Cell (Macro Cell)", "Small Cell (Small Cell)", "Femto Cell (Femto Cell)", "Pico Cell (Pico Cell)" "Sector (Sector)", "Cell Group (Cell Group)", "Serving Cell (Cell)", "Carrier (Carrier)", "Component Carrier (Component Carrier)", "Bandwidth Part (BWP)" and the like may be used interchangeably.

[0166] In some embodiments, the terms "terminal", "terminal device", "terminal side device", "user equipment (UE)", "user terminal" "mobile station (MS)", "mobile terminal (MT)", subscriber station (Subscriber Station), mobile unit (Mobile Unit), subscriber unit (Subscriber Unit), wireless unit (Wireless Unit), remote unit (Remote Unit), mobile device (Mobile Device), wireless device (Wireless Device), wireless communication device (Wireless Communication Device), remote device (Remote Device), mobile subscriber station (Mobile Subscriber Station), access terminal (Access Terminal), mobile terminal (Mobile Terminal), wireless terminal (Wireless Terminal), remote terminal (Remote Terminal), handset (Handset), user agent (User Agent), mobile client (Mobile Client), client (Client) and the like can be used interchangeably.

[0167] In some embodiments, the access network device, the core network device, or the network device can be replaced by a terminal device. For example, the various embodiments of the present disclosure can also be applied to a structure in which the communication between the access network device, the core network device, or the network device and the terminal device is replaced by the communication between multiple terminal devices (for example, device-to-device (D2D), vehicle-to-everything (V2X), etc.). In this case, it is also possible to set the structure in which the terminal device has all or part of the functions of the access network device. In addition, terms such as "uplink" and "downlink" can also be replaced by terms corresponding to communication between terminal devices (for example, "side"). For example, uplink channels, downlink channels, etc. can be replaced by side channels or direct channels, and uplinks, downlinks, etc. can be replaced by side links or direct links.

[0168] In some embodiments, the terminal device may be replaced by an access network device, a core network device, or a network device. In this case, the access network device, the core network device, or the network device may have a structure that has all or part of the functions of the terminal device.

[0169] In some embodiments, obtaining data, information, etc. may comply with the laws and regulations of the country where the data is obtained.

[0170] In some embodiments, data, information, etc. may be obtained with the user's consent.

[0171] In addition, each element, each row, or each column in the table of the embodiment of the present disclosure can be implemented as an independent embodiment, and the combination of any elements, any rows, and any columns can also be implemented as an independent embodiment.

[0172] FIG1A is a schematic diagram illustrating an architecture of a communication system according to an embodiment of the present disclosure. As shown in FIG1A , the communication system 100 may include a terminal device 101 and a network device 102 .

[0173] In some embodiments, the terminal device 101 may include at least one of a mobile phone, a wearable device, an Internet of Things device, a car with communication function, a smart car, a vehicle-mounted terminal, a tablet computer, a computer with wireless transceiver function, a road side unit (RSU), 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, and a wireless terminal device in smart home, but is not limited thereto.

[0174] In some embodiments, the network device 102 may include at least one of an access network device and a core network device.

[0175] In some embodiments, the access network device may be a node or device that accesses the terminal device to the wireless network. The access network device may include an evolved NodeB (eNB), a next generation evolved NodeB (ng-eNB), a next generation NodeB (gNB), a node B (NB), a home node B (HNB), a home evolved nodeB (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 base station (Open RAN), a cloud base station (Cloud RAN), a base station in other communication systems, and at least one of an access node in a Wi-Fi system, but is not limited thereto.

[0176] In some embodiments, the technical solution of the present disclosure can be applied to the Open RAN architecture. In this case, the interfaces between or within the access network devices involved in the embodiments of the present disclosure can be transformed into internal interfaces of the Open RAN, and the processes and information interactions between these internal interfaces can be implemented through software or programs.

[0177] In some embodiments, the access network device can be composed of a centralized unit (CU) and a distributed unit (DU), where the CU can also be called a control unit (Control Unit). The CU-DU structure can be used to split the protocol layer of the access network device, with the functions of some protocol layers centrally controlled by the CU, and the functions of the remaining part or all of the protocol layers distributed in the DU, which is centrally controlled by the CU, but is not limited to this.

[0178] In some embodiments, the core network device may be a single device, or may be multiple devices or a group of devices. The core network may include at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), and a Next Generation Core (NGC).

[0179] It can be understood that the communication system described in the embodiment of the present disclosure is for the purpose of more clearly illustrating the technical solution of the embodiment of the present disclosure, and does not constitute a limitation on the technical solution proposed in the embodiment of the present disclosure. Ordinary technicians in this field can know that with the evolution of the system architecture and the emergence of new business scenarios, the technical solution proposed in the embodiment of the present disclosure is also applicable to similar technical problems.

[0180] The following embodiments of the present disclosure may be applied to the communication system 100 shown in FIG1A , or a portion thereof, but are not limited thereto. The entities shown in FIG1A are examples. The communication system may include all or part of the entities shown in FIG1A , or may include other entities outside of FIG1A . The number and form of the entities are arbitrary. The entities may be physical or virtual. The connection relationship between the entities is an example. The entities may be connected or disconnected. The connection may be in any manner, whether direct or indirect, and may be wired or wireless.

[0181] The embodiments of the present disclosure may 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 802.17 (WiMAX (registered trademark)), IEEE 802.18 (WiMAX (registered trademark)), IEEE 802.19 (WiMAX (registered trademark)), IEEE 802.20 (WiMAX (registered trademark)), IEEE 802.21 (WiMAX (registered trademark)), IEEE 802.22 (WiMAX (registered trademark)), IEEE 802.23 (WiMAX (registered trademark)), IEEE 802.24 (WiMAX (registered trademark)), IEEE 802.25 (WiMAX (registered trademark)), IEEE 802.26 (WiMAX (registered trademark)), IEEE 802.27 (WiMAX (registered trademark)), IEEE 802.28 (WiMAX (registered trademark)), IEEE 802.29 (WiMAX (registered trademark)), IEEE 802.30 (WiMAX (registered trademark)), IEEE 802.31 (WiMAX (registered trademark)), IEEE 802.32 (WiMAX (registered trademark)), IEEE 802.33 (WiMAX (registered trademark)), 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), Public Land Mobile Network (PLMN) networks, Device-to-Device (D2D) systems, Machine-to-Machine (M2M) systems, Internet of Things (IoT) systems, Vehicle-to-Everything (V2X), systems utilizing other communication methods, and next-generation systems based on and extending these methods. Furthermore, multiple systems may be combined (for example, a combination of LTE or LTE-A with 5G).

[0182] In some embodiments of the present disclosure, as shown in FIG. 1A , the network device 102 may include a first network device 1021 and a second network device 1022 .

[0183] In some embodiments, the terminal device can perform cell switching between the first network device 1021 and the second network device 1022. For example, the first network device 1021 can be the network device corresponding to the current serving cell of the terminal device, and the serving cell can also be called the source cell (Source Cell) of the switching, that is, the cell where the terminal device performs signal transmission before the switching. The second network device 1022 can be the network device corresponding to the target cell (Target Cell) of the terminal device, that is, the cell where the terminal device performs signal transmission after the switching. Based on mobility management, the terminal device can switch from the source cell of the first network device 1021 to the target cell of the second network device 1022.

[0184] In some embodiments, the first network device 1021 and the second network device 1022 may be different access network devices (e.g., base stations), and the source cell and the target cell may be cells belonging to different access network devices (e.g., base stations). In this way, the terminal device can perform inter-station and inter-cell handover.

[0185] In other embodiments, the first network device 1021 and the second network device 1022 may be two cells under the same access network device (e.g., a base station), one being a source cell and the other being a target cell. In this way, the terminal device may perform intra-cell handover.

[0186] In some embodiments, the above-mentioned communication system may support LTM (L1 / L2-triggered Mobility). Based on LTM, the network device may configure one or more candidate cells (or candidate cell groups) for the terminal device, and the network device may control the terminal device to switch to the target cell through L1 signaling or L2 signaling. The target cell may be a cell (or cell group) selected by the serving cell from one or more candidate cells (or candidate cell groups) based on the beam measurement result.

[0187] For example, the terminal device can perform switching based on the L1 signaling or L2 signaling of the network device, for example, changing the service cell (or cell group) from the "source cell" to the target cell, which is the cell (or cell group) selected by the service cell from one or more candidate cells (or candidate cell groups) based on the beam measurement results.

[0188] In some embodiments, the L1 signaling may include downlink control information (DCI).

[0189] In some embodiments, the above-mentioned L2 signaling may include a Medium Access Control Control Element (MAC CE).

[0190] Optionally, the above-mentioned cell may also be a transmission and / or reception point (Transmission / Reception Point, TRP), and the above-mentioned cell group may also be a TRP group.

[0191] In some embodiments, based on LTM, the terminal device can perform signal measurement on one or more candidate cells, for example, the signal measurement can be based on a reference signal. Optionally, the reference signal can be a synchronization signal block (SSB), a channel state information reference signal (CSI-RS), or other reference signals. Optionally, terms such as "Synchronization Signal Block (SSB)" and "Synchronization Signal And Physical Downlink Broadcast Channel Block" can be used interchangeably.

[0192] In some embodiments, the signal measurements may be measurements for LTM (Layer 1 or Layer 2 Triggered Mobility).

[0193] Optionally, the name of the signal measurement is not limited, for example, it can be "beam measurement", "L1 measurement", "LTM-based measurement", "same-frequency measurement", "neighboring area measurement", "same-frequency neighboring area measurement", "same-frequency L1 measurement", "L1-RSRP measurement", "L1-SINR measurement", "L1-RSRQ measurement", "same-frequency L1-RSRP measurement", "same-frequency L1-SINR measurement", "same-frequency L1-RSRQ measurement", etc.

[0194] In some embodiments, through the above signal measurement, the terminal device can obtain at least one of the following measurement results:

[0195] Physical layer reference signal receiving power (Layer 1 Reference Signal Receiving Power, L1-RSRP);

[0196] Physical layer signal to interference plus noise ratio (Layer 1Signal to Interference plus Noise Ratio, L1-SINR);

[0197] Physical layer reference signal receiving quality (Layer 1 Reference Signal Receiving Quality, L1-RSRQ).

[0198] In some embodiments of the present disclosure, the terminal device may perform cell switching based on a RACH-less switching method. For example, the terminal device may implement switching from a source cell to a target cell based on RACH-less LTM. In the RACH-less LTM process, the source cell may indicate the beam of the target cell to the terminal device based on a cell switch command. The terminal device may send "first uplink data" to the target cell based on the configured grant (CG) resource through the beam. The "first uplink data" may be a confirmation message or an access message, which is used to notify or inform the target cell that the terminal device will switch to the target cell. After receiving the first uplink data, the target cell may send a DCI with scheduling information to the terminal device via the PDCCH (Physical Downlink Control Channel). After receiving the scheduling information, or receiving the predefined information transmitted in the resources scheduled by the DCI, the terminal device may determine that the switching is complete.

[0199] Optionally, the above-mentioned CG resource may be a pre-configured CG PUSCH (Physical Uplink Shared Channel).

[0200] In some embodiments, the beam may also be referred to as beam, Quasi co-location (QCL) Type D, spatial setting, spatial filter, spatial relation info, spatial RX parameters, spatial Tx parameter, Transmission Configuration Indication state (TCI state for short), etc., which is not limited in the embodiments of the present disclosure.

[0201] In some embodiments, the beam can be determined based on a TCI state, which can include a quasi-co-located QCL source and a QCL type. Different QCL types contain different channel parameters, and two reference signals with a QCL relationship have the same channel parameters (channel parameters contained in the QCL type). The channel parameters may include one or more of Doppler shift, Doppler spread, average delay, delay spread, and spatial Rx parameters.

[0202] In some embodiments, the QCL type may be any of the following:

[0203] QCL Type A, the channel parameters included in QCL Type A are Doppler frequency deviation, Doppler spread, average delay, and delay spread;

[0204] QCL Type B: The channel parameters included in QCL Type B are Doppler frequency deviation and Doppler spread;

[0205] QCL Type C: The channel parameters included in QCL Type C are average delay and Doppler frequency deviation;

[0206] QCL Type D: The channel parameters included in the QCL Type D are spatial reception parameters.

[0207] Optionally, the QCL Type D may be used to indicate beam information, i.e., spatial reception parameters. Assuming beam correspondence, the spatial transmission parameters and spatial reception parameters of the terminal device are the same.

[0208] In some embodiments of the present disclosure, the source cell may indicate the beam of the target cell to the terminal device, so that the terminal device can access the target cell through the beam. For the beam indication during the handover process, one or more TCI states of the candidate cell may be pre-configured for the terminal device.

[0209] In one implementation, the source cell may activate some or all of the pre-configured TCI states before sending a cell switching control, and indicate the TCI state of the target cell while triggering the switching through a cell switching control (cell switch command), where the TCI state indicates the beam (transmission beam) of the target cell.

[0210] In another implementation, the source cell may not activate the TCI state in advance, but directly indicate the activation of a TCI state when the cell switch control (cell switch command) indicates triggering the switch. The TCI state can be used to determine the transmission beam of the terminal device and the target cell.

[0211] Figure 1B is a schematic diagram showing configuration information according to an embodiment of the present disclosure. As shown in Figure 1B, the network device may send configuration information to the terminal device, and the configuration information may include serving cell configuration and handover configuration.

[0212] In some embodiments, the serving cell configuration may include a third TCI set, which may include one or more TCI states of the serving cell itself.

[0213] In some embodiments, the handover configuration may also be referred to as an LTM configuration, and the handover configuration may include parameters of the first TCI set and at least one candidate cell.

[0214] In one implementation, the first TCI set may be referred to as an LTM TCI state pool.

[0215] In one implementation, the candidate cell parameters may include a second TCI set, which may include one or more TCI states of the candidate cell itself. As shown in FIG1B , candidate cell-1 corresponds to second TCI set-1, and candidate cell-2 corresponds to second TCI set-2.

[0216] In some embodiments, the above configuration information may be referred to as RRC pre-configuration. Optionally, the RRC pre-configuration may be RRC reconfiguration (RRCReconfiguration) or other configuration information.

[0217] In some embodiments of the present disclosure, a terminal device needs to use a corresponding beam to transmit signals (such as data or signaling) after switching to a target cell. Therefore, how to determine the transmission beam becomes an urgent problem to be solved.

[0218] FIG2A is an interactive diagram illustrating a beam direction method according to an embodiment of the present disclosure. The method may be performed by the above-mentioned communication system. As shown in FIG2A , the method may include:

[0219] Step S2101: The first network device sends second information to the terminal device.

[0220] In some embodiments, the terminal device may receive the second information. For example, the terminal device may receive the second information sent by the first network device.

[0221] In some embodiments, the first network device is a network device corresponding to a service cell of the terminal device.

[0222] In some embodiments, the second information may include parameters of a first TCI set and a candidate cell preconfigured by the first network device for the terminal device. The first TCI set may include a TCI state corresponding to the candidate cell, and the candidate cell is configured by the first network device for the terminal device.

[0223] In some embodiments, the second information can be used to configure a first TCI set for the terminal device.

[0224] In some embodiments, the second information may be used to configure parameters (eg, RRC parameters) of one or more candidate cells for the terminal device.

[0225] In some embodiments, the second information may be used to configure configuration information related to cell switching (eg, LTM switching) for the terminal device.

[0226] In some embodiments, the name of the second information is not limited, for example, it can be "configuration information", "pre-configuration information", "switching pre-configuration information", "LTM pre-configuration information", "TCI pre-configuration information", "RRC pre-configuration information", etc.

[0227] In some embodiments, the first TCI set may include one or more TCI states for beam measurement.

[0228] In some embodiments, the first TCI set may include a TCI state corresponding to a candidate cell, and the candidate cell may be a cell configured by the first network device for beam measurement for the terminal device.

[0229] Optionally, a candidate cell may correspond to one or more TCI states, and the first TCI set may include N candidate cells, each candidate cell corresponding to at least one TCI state, for a total of M TCI states, where M and N are both positive integers, and M may be greater than or equal to N.

[0230] In some embodiments, the name of the first TCI set is not limited, for example, it can be "LTM TCI state pool", "LTM TCI state list", "TCI state set for signal measurement", "TCI state set for LTM", "TCI state list for LTM", "beam indication TCI states during switching", etc.

[0231] In some embodiments, the TCI state in the first TCI set may include a quasi-co-located QCL source, and the QCL source may include at least one of the following:

[0232] Synchronization signal block SSB of the candidate cell;

[0233] Channel State Information Reference Signal (CSI-RS) of the candidate cell.

[0234] In one implementation, the CSI-RS may be a Tracking Reference Signal (TRS). Information of the TRS may be independently configured, and a QCL source of the TRS may be an SSB measured by L1.

[0235] In some embodiments, the first TCI set may be independent of the second TCI set, wherein a second TCI set is a TCI set of a candidate cell itself.

[0236] For example, the TCI status of each candidate cell in the first TCI set may be the same as the TCI status configuration of each candidate cell itself.

[0237] In some embodiments, the first TCI set may be associated with the TCI state of the candidate cell itself. For example:

[0238] In one implementation, the TCI state corresponding to each candidate cell in the first TCI set may be part or all of the second TCI set corresponding to the candidate cell itself.

[0239] For example, the TCI state configuration parameters in the first TCI set may be the same as the TCI state configuration parameters of the candidate cells. For example, the TCI state corresponding to each candidate cell in the first TCI set may be part or all of the second TCI set of each candidate cell.

[0240] Optionally, the first TCI set may be a set that is identical to the TCI status of the candidate cell but is configured separately. For example, the first TCI set may be a separate information field in the second information, the TCI status of the candidate cell is also a separate information field, and the content of the information field of the first TCI set is identical to the TCI status of the candidate cell.

[0241] In another implementation, the first TCI set may include at least one TCI identifier, where one TCI identifier corresponds to a TCI state in the second TCI set of a candidate cell.

[0242] For example, the first TCI set may only include an identifier list of each candidate cell, corresponding to the TCI state configured under each candidate cell.

[0243] Optionally, the first network device may obtain and process the RRC parameters of each candidate cell in advance to obtain the TCI status and CSI-RS configuration, and then perform beam indication.

[0244] Optionally, there may be no actual first TCI set (LTM TCI state), and the beam during and after handover may actually be determined by the TCI state of the target cell itself.

[0245] In this way, by associating the first TCI set with the candidate cell TCI set, the TCI status can be determined.

[0246] In some embodiments, the first network device may send a second message, which may include the second information. For example, the first network device may send the second message to the terminal device. Optionally, the terminal device may receive the second message.

[0247] The second message may include at least one of a radio resource control RRC (Radio Resource Control) message, a medium access control control element MAC CE (Medium Access Control Control Element), downlink control information DCI (Downlink Control Information), or other messages sent by the first network device to the terminal device.

[0248] In one implementation, the second message is an RRC message.

[0249] In some embodiments, step S2101 may be omitted, and the terminal device may autonomously implement the function indicated by the second information, or the function may be defaulted or acquiesced. For example, the terminal device may autonomously obtain the first TCI set, or obtain the first TCI set based on other messages.

[0250] Step S2102: The terminal device performs signal measurement.

[0251] In some embodiments, the terminal device may perform beam measurement on the candidate cell based on a preconfigured measurement reference signal.

[0252] In some embodiments, the beam measurement may be a measurement used for cell handover.

[0253] In some embodiments, the beam measurements may be measurements used for LTM.

[0254] Optionally, the name of the signal measurement is not limited, for example, it can be "beam measurement", "L1 measurement", "LTM-based measurement", "L1-RSRP measurement", etc.

[0255] Step S2103: The terminal device sends a first measurement report to the first network device.

[0256] In some embodiments, the first network device may receive the first measurement report. For example, the first network device may receive the first measurement report sent by the terminal device.

[0257] In some embodiments, the first measurement report can be used to report beam measurement results of each candidate cell or a candidate cell and a serving cell to the first network device.

[0258] In some embodiments, the name of the first measurement report is not limited, and may be, for example, "LTM measurement report", "measurement result information", etc.

[0259] In some embodiments, the terminal device may send a first report message, which may include the first measurement report. For example, the terminal device may send the first report message to the first network device. Optionally, the first network device may receive the first report message.

[0260] Step S2104: The first network device sends third information to the terminal device.

[0261] In some embodiments, the terminal device may receive the third information. For example, the terminal device may receive the third information sent by the first network device.

[0262] In some embodiments, the third information may be a TCI state corresponding to one or more candidate cells in the first TCI set activated by the terminal device.

[0263] In some embodiments, the third information may be activation of at least one TCI state in the first TCI set for the terminal device.

[0264] In some embodiments, the third information may be used to instruct the terminal device to activate at least one TCI state in the first TCI set.

[0265] In some embodiments, the third information may be used to instruct the terminal device to activate at least one TCI state for signal measurement.

[0266] In some embodiments, the name of the third information is not limited, for example, it can be "TCI status activation information", "information for activating TCI status", "activation information", etc.

[0267] In some embodiments, the first network device may determine at least one TCI state to be activated based on the first measurement report, and transmit the third information to activate the TCI state using the third information. For example, based on the first measurement report, the first network device may select a candidate cell with the highest probability of handover, or a candidate cell with the strongest signal strength, and use one or more TCI states of the selected candidate cell as the TCI state to be activated.

[0268] In other embodiments, the first network device may autonomously determine at least one TCI state to be activated and send the third information.

[0269] In some embodiments, the first network device may send a third message, which may include the third information. For example, the first network device may send the third message to the terminal device. Optionally, the terminal device may receive the third message.

[0270] The third message may include at least one of an RRC message, a MAC CE, a DCI, or other messages sent by the first network device to the terminal device.

[0271] In one implementation, the third message is MAC CE or DCI.

[0272] In some embodiments, step S2104 may be omitted.

[0273] Step S2105: The first network device sends first information to the terminal device.

[0274] In some embodiments, the terminal device may receive the first information. For example, the terminal device may receive the first information sent by the first network device.

[0275] In some embodiments, the first information may trigger the terminal device to switch to the target cell or perform a handover to the target cell.

[0276] In some embodiments, the name of the first information is not limited, and may be, for example, "cell switch command", "switching indication", "switching command", etc.

[0277] In some embodiments, the terminal device may switch to the target cell based on RACH-less switching.

[0278] In some embodiments, the first information may include a first identifier and / or a second identifier, wherein: the first identifier may be a cell identifier of the target cell, and the second identifier may be used to determine the first TCI state.

[0279] In some embodiments, the first TCI state may indicate a first beam, which may be a beam used by the terminal device when performing a handover to a target cell.

[0280] In some embodiments, the first TCI state may be a TCI state in a first TCI set, for example:

[0281] In one implementation, the first TCI state may be at least one of the TCI states corresponding to the target cell in the first TCI set.

[0282] In another implementation, the first TCI state may be at least one of the TCI states in the first TCI set that is in an activated state and corresponds to the target cell.

[0283] In some embodiments, the first TCI state may be a TCI state corresponding to the target cell.

[0284] In some embodiments, the first network device may determine a target cell and use at least one of the TCI states corresponding to the target cell as the first TCI state. For example, the first network device may determine the target cell and the first TCI state of the target cell based on beam measurement. For example, the candidate cell with the strongest signal strength may be used as the target cell for handover. For another example, the first network device may determine the target cell based on other criteria.

[0285] In some embodiments, the first network device may send a first message that may include the first information. For example, the first network device may send the first message to the terminal device. Optionally, the terminal device may receive the first message. Optionally, the first message may also include the third information.

[0286] The first message may include at least one of an RRC message, a MAC CE, a DCI, or other messages sent by the first network device to the terminal device.

[0287] In one implementation, the first message is a MAC CE or a DCI.

[0288] Step S2106: The terminal device determines the first TCI state.

[0289] In some embodiments, the terminal device may determine the first TCI state based on the first information.

[0290] In some embodiments, the terminal device may determine a first TCI state in response to receiving the first information.

[0291] In some embodiments, the terminal device may determine the first TCI state based on the second identifier in the first message.

[0292] In some embodiments, the terminal device may determine a first beam based on the first TCI state and use the first beam for signal transmission during handover to the target cell. For example, the terminal device may use the first beam to send signals to the target cell or receive signals from the target cell.

[0293] Step S2107: The terminal device sends seventh information to the second network device.

[0294] In some embodiments, the second network device may receive the seventh information. For example, the second network device may receive the seventh information sent by the terminal device.

[0295] In some embodiments, the second network device may be a network device corresponding to the target cell.

[0296] In some embodiments, the seventh information can be used to instruct the terminal device to access the second network device.

[0297] In some embodiments, the seventh information may be an access message or a confirmation message.

[0298] In some embodiments, the name of the seventh information is not limited, for example, it can be "access message", "confirmation message", "switching indication", "access indication", "first uplink data", "First UL data", etc.

[0299] In some embodiments, the terminal device may send the seventh information via the first beam. Similarly, the second network device may also receive the seventh information via the first beam.

[0300] Step S2108: The second network device sends fourth information to the terminal device.

[0301] In some embodiments, the terminal device may receive the fourth information. For example, the terminal device may receive the fourth information sent by the second network device.

[0302] In some embodiments, the fourth information may be used to indicate that the seventh information sent by the terminal device is successfully received by the target cell.

[0303] In some embodiments, the fourth information can be used to determine whether the terminal device has successfully switched to the target cell.

[0304] In some embodiments, the fourth information may be used to indicate that the terminal device has successfully switched to the target cell.

[0305] In some embodiments, the name of the fourth information is not limited, and may be, for example, "switching completion information", "switching success information", "first PDCCH scheduling", etc.

[0306] In some embodiments, the second network device may send the fourth information via the first beam. Similarly, the terminal device may also receive the fourth information via the first beam.

[0307] In some embodiments, the fourth information may be a DCI of resources scheduled for the first time received by the terminal device on the target cell. For example, the resources scheduled by the fourth information may be PUSCH or PDSCH resources.

[0308] In some other embodiments, the fourth information is scheduled on a PDSCH and transmits preset information. For example, the fourth information may be preset information specified by a protocol and transmitted on the PDSCH scheduled by the fourth information sent by the target cell.

[0309] Step S2109: The second network device sends the eighth information to the terminal device.

[0310] In some embodiments, the terminal device may receive the eighth information. For example, the terminal device may receive the eighth information sent by the second network device.

[0311] In some embodiments, the eighth information may be used to indicate a sixth TCI state.

[0312] In some embodiments, the eighth information is transmitted on the PDSCH scheduled by the fourth information.

[0313] In some embodiments, the terminal device may determine the sixth TCI state based on the eighth information and keep the sixth TCI state activated.

[0314] In some embodiments, step S2109 is an optional step, and the terminal device can autonomously determine the sixth TCI state in response to receiving the fourth information.

[0315] In some embodiments, the sixth TCI state may be at least one of the fourth TCI states, and the fourth TCI state may be a TCI state in which the terminal device remains in an active state after switching.

[0316] In some embodiments, after determining that the terminal device has switched to the target cell (for example, receiving the fourth information), the fourth TCI state may be kept activated. The fourth TCI state may include any one of the following:

[0317] First TCI status;

[0318] The TCI state in the first TCI set that is in an activated state and corresponds to the target cell;

[0319] The fourth TCI state is an activated TCI state in the first TCI set. In an optional implementation, the fourth TCI state may be the first TCI state.

[0320] For example, after the handover is completed, all TCI states in the activated TCI state (LTM TCI state) except the first TCI state indicated by the first information (handover signaling) are deactivated. Optionally, before the target cell indicates the TCI state under its own configuration, the terminal device can use the first beam indicated by the first TCI state.

[0321] In another optional implementation, the fourth TCI state may be a TCI state that is in an activated state in the first TCI set and corresponds to the target cell.

[0322] For example, after the handover is completed, the terminal device can deactivate all activated TCI states of other candidate cells, but maintain the activated TCI state of the target cell.

[0323] Optionally, identification information may be included in the above, the second information or the third information, and the identification information may be used to determine which candidate cell the TCI state in the first TCI set corresponds to, or which candidate cell the activated TCI state corresponds to, or which candidate cell the indicated TCI state corresponds to.

[0324] Optionally, before the target cell indicates the TCI state under its own configuration, the target cell may indicate a TCI state in the fourth TCI state for updating the transmission beam.

[0325] In another optional implementation, the fourth TCI state may be an activated TCI state in the first TCI set.

[0326] For example, after the handover is completed, the terminal device may retain all activated TCI states in the first TCI set to support subsequent LTM.

[0327] Optionally, before the target cell indicates the TCI state under its own configuration, the target cell may indicate the TCI state corresponding to the target cell in the fourth TCI state for updating the transmission beam.

[0328] Optionally, explicit deactivation signaling may be defined, for example, the second network device may deactivate the TCI state through the fifth information.

[0329] In some embodiments, the target cell (second network device) may indicate its own TCI status. For example, the second network device indicates its own TCI status to the terminal device through the sixth information.

[0330] In some embodiments of the present disclosure, different fourth TCI states may be determined corresponding to different designs of the first TCI set. For example:

[0331] In a first optional implementation manner, the first TCI set may be designed independently (not associated with the second TCI set of the candidate cell), and the QCL source is SSB.

[0332] In this manner, after determining that the terminal device is switched to the target cell, the fourth TCI state may be kept activated, where the fourth TCI state is the first TCI state.

[0333] In a second optional implementation, the first TCI set may be designed independently (not associated with the second TCI set of the candidate cell), and the QCL source is a CSI-RS (eg, a TRS).

[0334] In this manner, after determining that the terminal device has switched to the target cell, the fourth TCI state may be maintained in an activated state. The fourth TCI state is any one of the following: the first TCI state; an activated TCI state in the first TCI set corresponding to the target cell; or an activated TCI state in the first TCI set.

[0335] In a third optional implementation, the first TCI set may be associated with the second TCI set of the candidate cell, and the first TCI set may be a union of at least one second TCI set, where a second TCI set is a TCI set of a candidate cell itself.

[0336] In this manner, after determining that the terminal device has switched to the target cell, the fourth TCI state may be maintained in an activated state. The fourth TCI state is any one of the following: a TCI state in the first TCI set that is activated and corresponds to the target cell; or a TCI state in the first TCI set that is activated.

[0337] In a fourth optional implementation, the first TCI set may be associated with the second TCI set of the candidate cell, and the first TCI set may include at least one TCI identifier, where one TCI identifier corresponds to one TCI state in the second TCI set.

[0338] In this manner, after determining that the terminal device has switched to the target cell, the fourth TCI state may be maintained in an activated state. The fourth TCI state is any one of the following: a TCI state in the first TCI set that is activated and corresponds to the target cell; or a TCI state in the first TCI set that is activated.

[0339] Step S2110: The terminal device determines the second TCI state.

[0340] In some embodiments, the second TCI state may indicate a second beam, which may be a beam used by the terminal device after handover to the target cell. For example, after successful handover to the target cell, the terminal device may send data and / or signaling to the target cell via the second beam.

[0341] In some embodiments, the second TCI state may be the same as or different from the first TCI state.

[0342] In some embodiments, the second TCI state may be the first TCI state described above.

[0343] In other embodiments, the second TCI state may be the sixth TCI state, that is, the TCI state indicated by the eighth information. For example, the second TCI state may be at least one TCI state that is activated in the first TCI set and corresponds to the target cell and is different from the first TCI state.

[0344] In some other embodiments, the second TCI state may be at least one of the TCI states in the first TCI set that is in an activated state and corresponds to the target cell, for example, other TCI states except the above-mentioned first TCI state and sixth TCI state.

[0345] Step S2111: The second network device sends fifth information to the terminal device.

[0346] In some embodiments, the terminal device may receive the fifth information. For example, the terminal device may receive the fifth information sent by the second network device.

[0347] In some embodiments, the fifth information can be used to instruct the terminal device to deactivate the TCI state.

[0348] In some embodiments, the fifth information can be used to instruct the terminal device to deactivate the third TCI state.

[0349] In one implementation, the third TCI state may be all or part of the TCI states in the first TCI set.

[0350] In another implementation, the third TCI state may be a subset or a complete set of the activated TCI states in the first TCI set.

[0351] In another implementation, the third TCI state may be a TCI state that is currently in an activated state and the network device determines that it does not need to remain activated (eg, a TCI state that is currently not used for data transmission).

[0352] In yet another implementation, the third TCI state does not include the second TCI state.

[0353] In yet another implementation, the third TCI state may be another TCI state among the activated TCI states in the first TCI set except the second TCI state.

[0354] In some embodiments, the name of the fifth information is not limited, for example, it can be "deactivation information", "deactivation signaling", "TCI state deactivation signaling", etc.

[0355] In this way, the corresponding TCI state can be deactivated through the fifth information, avoiding the terminal device from maintaining too many TCI states activated, reducing the power consumption of the terminal device, and improving the performance of the terminal device.

[0356] In some embodiments, the second network device may send a fifth message, which may include the fifth information. For example, the second network device may send the fifth message to the terminal device. Optionally, the terminal device may receive the fifth message.

[0357] The fifth message may include at least one of an RRC message, a MAC CE, a DCI, or other messages sent by the second network device to the terminal device.

[0358] In some embodiments, the fifth information may be a MAC CE or a DCI.

[0359] In some embodiments, step S2111 may be omitted, and the terminal device may autonomously implement the function indicated by the fifth information, or the above function may be default or acquiescent. For example, the terminal device may autonomously deactivate the third TCI state.

[0360] Step S2112: The second network device sends sixth information to the terminal device.

[0361] In some embodiments, the terminal device may receive the sixth information. For example, the terminal device may receive the sixth information sent by the second network device.

[0362] In some embodiments, the sixth information may indicate a fifth TCI state, which may be the TCI state of the target cell itself.

[0363] In some embodiments, the sixth information can be used to activate the fifth TCI state for the terminal device.

[0364] In some embodiments, the sixth information may be used to indicate the fifth TCI state for the terminal device.

[0365] In some embodiments, the name of the sixth information is not limited, for example, it can be "TCI status configuration information", "TCI status activation information", "TCI status indication information", etc.

[0366] In some embodiments, after receiving the sixth information, the terminal device may deactivate the second TCI state and activate the fifth TCI state.

[0367] In some embodiments, after receiving the sixth information, the terminal device may deactivate all TCI states except the fifth TCI state.

[0368] In some embodiments, the second network device may send a sixth message, which may include the sixth information. For example, the second network device may send the sixth message to the terminal device. Optionally, the terminal device may receive the sixth message.

[0369] The sixth message may include at least one of an RRC message, a MAC CE, a DCI, or other messages sent by the second network device to the terminal device.

[0370] In some embodiments, step S2112 may be omitted. For example, the terminal device may always use the second TCI state.

[0371] The method involved in the embodiment of the present disclosure may include at least one of the above steps S2101 to S2112. For example, step S2105 can be implemented as an independent embodiment, step S2110 can be implemented as an independent embodiment, steps S2105+S2106+S2110 can be implemented as an independent embodiment, steps S2101+S2104+S2105+S2106+S2108+S2110 can be implemented as an independent embodiment, steps S2101+S2104+S2105+S2106+S2107+S2108+S2110 can be implemented as an independent embodiment, steps S2101+S2104+S2105+S2106+S2107+S2108+S2110 can be implemented as an independent embodiment, and steps S2101+S2104+S2105+S2106+S2107+S2108+S2110+S2111 can be implemented as an independent embodiment. 112 can be implemented as an independent embodiment, steps S2101+S2104+S2105+S2106+S2107+S2108+S2110+S2111+S2112 can be implemented as an independent embodiment, steps S2105+S2106+S2107+S2108+S2110 can be implemented as an independent embodiment, and steps S2105+S2106+S2107+S2108+S2110 can be implemented as an independent embodiment. 07+S2108+S2110+S2112 can be implemented as an independent embodiment, steps S2105+S2106+S2107+S2108+S2110+S2111 can be implemented as an independent embodiment, and steps S2105+S2106+S2107+S2108+S2110+S2111+S2112 can be implemented as an independent embodiment, but are not limited to this.

[0372] In some embodiments, the above steps S2101 to S2112 can be executed in a swapped order or simultaneously.

[0373] In some embodiments, the above steps S2101 to S2112 are all optional steps.

[0374] In some embodiments, reference may be made to other optional implementations described before or after the description corresponding to FIG. 2A .

[0375] In this way, the terminal device can use the first beam to switch to the target cell during the switching process, use the second beam to transmit signals after switching to the target cell, and deactivate or activate the TCI state according to the instructions of the target cell after switching, thereby providing a flexible beam indication and control method, which can improve the switching success rate and communication efficiency.

[0376] FIG2B is an interactive diagram illustrating a beam direction method according to an embodiment of the present disclosure. As shown in FIG2B , an embodiment of the present disclosure relates to a beam direction method, which can be performed by a communication system and may include:

[0377] Step S2201: The first network device sends second information to the terminal device.

[0378] The optional implementation of step S2201 can refer to the optional implementation of step S2101 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0379] Step S2202: The first network device sends third information to the terminal device.

[0380] The optional implementation of step S2202 can refer to the optional implementation of step S2104 in FIG. 2A and other related parts in the embodiment involved in FIG. 2A , which will not be described in detail here.

[0381] Step S2203: The first network device sends first information to the terminal device.

[0382] The optional implementation of step S2203 can refer to the optional implementation of step S2105 in FIG2A and other related parts in the embodiment involved in FIG2A , which will not be described in detail here.

[0383] Step S2204: The terminal device determines the first TCI state.

[0384] The optional implementation of step S2204 can refer to the optional implementation of step S2106 in FIG2A and other related parts in the embodiment involved in FIG2A , which will not be described in detail here.

[0385] Step S2205: The terminal device sends seventh information to the second network device.

[0386] The optional implementation of step S2205 can refer to the optional implementation of step S2107 in FIG2A and other related parts in the embodiment involved in FIG2A , which will not be described in detail here.

[0387] Step S2206: The second network device sends fourth information to the terminal device.

[0388] The optional implementation of step S2206 can refer to the optional implementation of step S2108 in FIG2A and other related parts in the embodiment involved in FIG2A , which will not be described in detail here.

[0389] Step S2208: The terminal device determines the second TCI state.

[0390] The optional implementation of step S2208 can refer to the optional implementation of step S2110 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0391] Step S2208: The second network device sends sixth information to the terminal device.

[0392] The optional implementation of step S2208 can refer to the optional implementation of step S2112 in FIG. 2A and other related parts in the embodiment involved in FIG. 2A , which will not be described in detail here.

[0393] In some embodiments, the above steps S2201 to S2208 can be executed in a swapped order or simultaneously.

[0394] In some embodiments, the above steps S2201 to S2208 are all optional steps.

[0395] In some embodiments, the embodiment shown in FIG. 2B may also be combined with any one or more steps in the embodiment shown in FIG. 2A to form a new embodiment.

[0396] In this way, the terminal device can use the first beam to switch to the target cell during the switching process, use the second beam to transmit signals after switching to the target cell, and activate the TCI state of the target cell according to the instructions of the target cell after switching, thereby improving the switching success rate and communication efficiency.

[0397] FIG2C is an interactive diagram illustrating a beam direction method according to an embodiment of the present disclosure. As shown in FIG2C , an embodiment of the present disclosure relates to a beam direction method, which can be performed by a communication system and may include:

[0398] Step S2301: The first network device sends first information to the terminal device.

[0399] The optional implementation of step S2301 can refer to the optional implementation of step S2105 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0400] Step S2302: The terminal device determines the first TCI state.

[0401] The optional implementation of step S2302 can refer to the optional implementation of step S2106 in FIG2A and other related parts in the embodiment involved in FIG2A , which will not be described in detail here.

[0402] Step S2303: The terminal device determines the second TCI state.

[0403] The optional implementation of step S2303 can refer to the optional implementation of step S2110 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0404] In some embodiments, the above steps S2301 to S2303 can be executed in a swapped order or simultaneously.

[0405] In some embodiments, the above steps S2301 to S2303 are all optional steps.

[0406] In some embodiments, the embodiment shown in FIG. 2C may also be combined with any one or more steps in the embodiment shown in FIG. 2A to form a new embodiment.

[0407] In this way, the terminal device can determine the second beam to be used after switching to the target cell, so that the terminal device switches to the target cell and communicates through the target cell, thereby improving the switching success rate and communication efficiency.

[0408] FIG3A is a flow chart illustrating a beam direction method according to an embodiment of the present disclosure. As shown in FIG3A , an embodiment of the present disclosure relates to a beam direction method, which can be performed by a terminal device. The method may include:

[0409] Step S3101: Obtain second information.

[0410] The optional implementation of step S3101 can refer to the optional implementation of step S2101 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0411] In some embodiments, the terminal device may receive the second information sent by the first network device, but is not limited thereto. The terminal device may also receive the second information sent by other entities.

[0412] In some embodiments, the terminal device may obtain second information specified by the protocol.

[0413] In some embodiments, the terminal device may obtain the second information from upper layer(s).

[0414] In some embodiments, the terminal device may perform processing to obtain the second information.

[0415] In some embodiments, step S3101 may be omitted, and the terminal device may autonomously implement the function indicated by the second information, or the above function may be default or by default.

[0416] Step S3102: perform signal measurement.

[0417] The optional implementation of step S3102 can refer to the optional implementation of step S2102 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0418] Step S3103: Send a first measurement report.

[0419] The optional implementation of step S3103 can refer to the optional implementation of step S2103 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0420] In some embodiments, the terminal device may send the first measurement report to the first network device, but is not limited thereto. The terminal device may also send the first measurement report to other entities.

[0421] Step S3104: Obtain third information.

[0422] The optional implementation of step S3104 can refer to the optional implementation of step S2104 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0423] In some embodiments, the terminal device may receive the third information sent by the first network device, but is not limited thereto. The terminal device may also receive the third information sent by other entities.

[0424] In some embodiments, the terminal device may obtain third information specified by the protocol.

[0425] In some embodiments, the terminal device may obtain the third information from upper layer(s).

[0426] In some embodiments, the terminal device may perform processing to obtain the third information.

[0427] In some embodiments, step S3104 may be omitted, and the terminal device may autonomously implement the function indicated by the third information, or the above function may be default or by default.

[0428] Step S3105: Obtain first information.

[0429] The optional implementation of step S3105 can refer to the optional implementation of step S2105 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0430] In some embodiments, the terminal device may receive the first information sent by the first network device, but is not limited thereto. The terminal device may also receive the first information sent by other entities.

[0431] In some embodiments, the terminal device may obtain first information specified by the protocol.

[0432] In some embodiments, the terminal device may obtain the first information from an upper layer(s).

[0433] In some embodiments, the terminal device may perform processing to obtain the first information.

[0434] In some embodiments, step S3105 may be omitted, and the terminal device may autonomously implement the function indicated by the first information, or the above function may be default or by default.

[0435] Step S3106: Determine the first TCI state.

[0436] The optional implementation of step S3106 can refer to the optional implementation of step S2106 in FIG2A and other related parts in the embodiment involved in FIG2A , which will not be described in detail here.

[0437] Step S3107: Send the seventh information.

[0438] The optional implementation of step S3107 can refer to the optional implementation of step S2107 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0439] In some embodiments, the terminal device may send the seventh information to the second network device, but is not limited thereto. The terminal device may also send the seventh information to other entities.

[0440] Step S3108: Obtain fourth information.

[0441] The optional implementation of step S3108 can refer to the optional implementation of step S2108 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0442] In some embodiments, the terminal device may receive the fourth information sent by the second network device, but is not limited thereto. The terminal device may also receive the fourth information sent by other entities.

[0443] In some embodiments, the terminal device may obtain fourth information specified by the protocol.

[0444] In some embodiments, the terminal device may obtain the fourth information from upper layer(s).

[0445] In some embodiments, the terminal device may perform processing to obtain the fourth information.

[0446] In some embodiments, step S3108 may be omitted, and the terminal device may autonomously implement the function indicated by the fourth information, or the above function may be default or by default.

[0447] Step S3110: Determine the second TCI state.

[0448] The optional implementation of step S3110 can refer to the optional implementation of step S2110 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0449] Step S3111: Obtain the fifth information.

[0450] The optional implementation of step S3111 can refer to the optional implementation of step S2111 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0451] In some embodiments, the terminal device may receive the fifth information sent by the second network device, but is not limited thereto. The terminal device may also receive the fifth information sent by other entities.

[0452] In some embodiments, the terminal device may obtain fifth information specified by the protocol.

[0453] In some embodiments, the terminal device may obtain the fifth information from upper layer(s).

[0454] In some embodiments, the terminal device may perform processing to obtain the fifth information.

[0455] In some embodiments, step S3111 may be omitted, and the terminal device may autonomously implement the function indicated by the fifth information, or the above function may be default or by default.

[0456] Step S3112: Obtain sixth information.

[0457] The optional implementation of step S3112 can refer to the optional implementation of step S2112 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0458] In some embodiments, the terminal device may receive the sixth information sent by the second network device, but is not limited thereto. The terminal device may also receive the sixth information sent by other entities.

[0459] In some embodiments, the terminal device may obtain sixth information specified by the protocol.

[0460] In some embodiments, the terminal device may obtain the sixth information from upper layer(s).

[0461] In some embodiments, the terminal device may perform processing to obtain the sixth information.

[0462] In some embodiments, step S3112 may be omitted, and the terminal device may autonomously implement the function indicated by the sixth information, or the above function may be default or by default.

[0463] The method involved in the embodiment of the present disclosure may include at least one of the above-mentioned steps S3101 to S3112. For example, step S3105 can be implemented as an independent embodiment, step S3110 can be implemented as an independent embodiment, steps S3105+S3106+S3110 can be implemented as an independent embodiment, steps S3101+S3104+S3105+S3106+S3108+S3110 can be implemented as an independent embodiment, steps S3101+S3104+S3105+S3106+S3107+S3108+S3110 can be implemented as an independent embodiment, steps S3101+S3104+S3105+S3106+S3107+S3108+S3109+S3110 can be implemented as an independent embodiment, and steps S3101+S3104+S3105+S3106+S3107+S3108+S3110+S3111 can be implemented as an independent embodiment. 112 can be implemented as an independent embodiment, steps S3101+S3104+S3105+S3106+S3107+S3108+S3110+S3111+S3112 can be implemented as an independent embodiment, steps S3105+S3106+S3107+S3108+S3110 can be implemented as an independent embodiment, and steps S3105+S3106+S3107+S3108+S3110 can be implemented as an independent embodiment. 07+S3108+S3110+S3112 can be implemented as an independent embodiment, steps S3105+S3106+S3107+S3108+S3110+S3111 can be implemented as an independent embodiment, and steps S3105+S3106+S3107+S3108+S3110+S3111+S3112 can be implemented as an independent embodiment, but are not limited to this.

[0464] In some embodiments, the above steps S3101 to S3112 can be executed in a swapped order or simultaneously.

[0465] In some embodiments, the above steps S3101 to S3112 are all optional steps.

[0466] In this way, the terminal device can use the first beam to switch to the target cell during the switching process, use the second beam to transmit signals after switching to the target cell, and deactivate or activate the TCI state according to the instructions of the target cell after switching, thereby providing a flexible beam indication and control method, which can improve the switching success rate and communication efficiency.

[0467] FIG3B is a flow chart illustrating a beam direction method according to an embodiment of the present disclosure. As shown in FIG3B , the embodiment of the present disclosure relates to a beam direction method, which can be performed by a terminal device. The method may include:

[0468] Step S3201: Obtain second information.

[0469] The optional implementation of step S3201 can be found in step S2101 of FIG. 2A , the optional implementation of step S3101 of FIG. 3A , and other related parts in the embodiments involved in FIG. 2A and FIG. 3A , which will not be repeated here.

[0470] Step S3202: Obtain third information.

[0471] The optional implementation of step S3202 can be found in step S2104 of FIG. 2A , the optional implementation of step S3104 of FIG. 3A , and other related parts in the embodiments involved in FIG. 2A and FIG. 3A , which will not be described in detail here.

[0472] Step S3203: Obtain first information.

[0473] The optional implementation of step S3203 can be found in step S2105 of FIG. 2A , the optional implementation of step S3105 of FIG. 3A , and other related parts in the embodiments involved in FIG. 2A and FIG. 3A , which will not be described in detail here.

[0474] Step S3204: Determine the first TCI state.

[0475] Optional implementations of step S3204 may be found in step S2106 of FIG. 2A , optional implementations of step S3106 of FIG. 3A , and other related parts in the embodiments involved in FIG. 2A and FIG. 3A , which will not be described in detail here.

[0476] Step S3205: Send the seventh information.

[0477] The optional implementation of step S3205 can be found in step S2107 of FIG. 2A , the optional implementation of step S3107 of FIG. 3A , and other related parts in the embodiments involved in FIG. 2A and FIG. 3A , which will not be described in detail here.

[0478] Step S3206: Obtain fourth information.

[0479] Optional implementations of step S3206 may be found in step S2108 of FIG. 2A , optional implementations of step S3108 of FIG. 3A , and other related parts in the embodiments involved in FIG. 2A and FIG. 3A , which will not be described in detail here.

[0480] Step S3207: Determine the second TCI state.

[0481] The optional implementation of step S3207 can be found in step S2110 of FIG. 2A , the optional implementation of step S3110 of FIG. 3A , and other related parts in the embodiments involved in FIG. 2A and FIG. 3A , which will not be repeated here.

[0482] Step S3208: Obtain sixth information.

[0483] The optional implementation of step S3208 can be found in step S2112 of FIG. 2A , the optional implementation of step S3112 of FIG. 3A , and other related parts in the embodiments involved in FIG. 2A and FIG. 3A , which will not be described in detail here.

[0484] In some embodiments, the above steps are all optional steps.

[0485] In some embodiments, the above steps can be performed in a different order or simultaneously.

[0486] In some embodiments, the embodiment shown in FIG. 3B may also be combined with any one or more steps in the embodiment shown in FIG. 3A to form a new embodiment.

[0487] In this way, the terminal device can use the first beam to switch to the target cell during the switching process, use the second beam to transmit signals after switching to the target cell, and activate the TCI state of the target cell according to the instructions of the target cell after switching, thereby improving the switching success rate and communication efficiency.

[0488] FIG3C is a flow chart illustrating a beam direction method according to an embodiment of the present disclosure. As shown in FIG3C , an embodiment of the present disclosure relates to a beam direction method, which can be performed by a terminal device. The method may include:

[0489] Step S3301: Obtain first information.

[0490] The optional implementation of step S3301 can be found in step S2105 of FIG. 2A , the optional implementation of step S3105 of FIG. 3A , and other related parts in the embodiments involved in FIG. 2A and FIG. 3A , which will not be repeated here.

[0491] In some embodiments, the first information triggers the terminal device to perform a handover to a target cell, and the first network device is a network device corresponding to a current serving cell of the terminal device.

[0492] Step S3302: Determine the first TCI state.

[0493] The optional implementation of step S3302 can be found in step S2106 of FIG. 2A , the optional implementation of step S3106 of FIG. 3A , and other related parts in the embodiments involved in FIG. 2A and FIG. 3A , which will not be described in detail here.

[0494] In some embodiments, the first TCI state indicates a first beam, which is a beam used by the terminal device when performing a handover to the target cell.

[0495] Step S3303: Determine the second TCI state.

[0496] The optional implementation of step S3303 can be found in step S2110 of FIG. 2A , the optional implementation of step S3110 of FIG. 3A , and other related parts in the embodiments involved in FIG. 2A and FIG. 3A , which will not be described in detail here.

[0497] In some embodiments, the second TCI state indicates a second beam, where the second beam is the beam used by the terminal device after switching to the target cell, and the second TCI state is the same as or different from the first TCI state.

[0498] In some embodiments, the above steps are all optional steps.

[0499] In some embodiments, the above steps can be performed in a different order or simultaneously.

[0500] In some embodiments, the embodiment shown in FIG. 3C may also be combined with any one or more steps in the embodiment shown in FIG. 3A to form a new embodiment.

[0501] In this way, the terminal device can determine the second beam to be used after switching to the target cell, so that the terminal device switches to the target cell and communicates through the target cell, thereby improving the switching success rate and communication efficiency.

[0502] In some embodiments, the first information includes a first identifier and / or a second identifier, the first identifier is a cell identifier of the target cell, and the second identifier is used to determine the first TCI state.

[0503] In some embodiments, the method further comprises:

[0504] Receive the second information sent by the first network device, the second information includes the first TCI set and the parameters of the candidate cell pre-configured by the first network device for the terminal device, the first TCI set includes the TCI status corresponding to the candidate cell, and the candidate cell is the cell configured by the first network device for the terminal device to perform beam measurement.

[0505] In some embodiments, the method further comprises:

[0506] Receive the third information sent by the first network device, where the third information is the TCI status corresponding to one or more candidate cells in the first TCI set activated by the terminal device.

[0507] In some embodiments, the first TCI state is any one of the following:

[0508] at least one of the TCI states corresponding to the target cell in the first TCI set;

[0509] At least one of the TCI states in the first TCI set that is in an activated state and corresponds to the target cell.

[0510] In some embodiments, the second TCI state is any one of the following:

[0511] the first TCI state;

[0512] At least one TCI state in the first TCI set that is activated and corresponds to the target cell is different from the first TCI state.

[0513] In some embodiments, the method further comprises:

[0514] Receive fourth information sent by a second network device, where the second network device is the network device corresponding to the target cell, and the fourth information is used to determine whether the terminal device has successfully switched to the target cell.

[0515] In some embodiments, the fourth information is the first scheduled new transmission of the terminal device on the target cell; or, the fourth information is preset information, and the preset information is transmitted on the physical downlink shared channel PDSCH of the first scheduling of the target cell.

[0516] In some embodiments, the method further comprises:

[0517] Receive fifth information sent by the second network device, where the fifth information instructs the terminal device to deactivate a third TCI state, where the third TCI state is all or part of the TCI states in the first TCI set.

[0518] In some embodiments, the TCI state includes a quasi-co-located QCL source, the QCL source including at least one of the following:

[0519] Synchronization signal block SSB of the candidate cell;

[0520] The channel state information reference signal CSI-RS of the candidate cell.

[0521] In some embodiments, the first TCI set is the union of the second TCI sets of each candidate cell, and the second TCI set is the TCI set of the candidate cell itself; or, the first TCI set includes at least one TCI identifier, and one TCI identifier corresponds to one TCI state in the second TCI set.

[0522] In some embodiments, the method further comprises:

[0523] After determining that the terminal device switches to the target cell, maintaining the fourth TCI state in an activated state, the fourth TCI state includes any one of the following:

[0524] the first TCI state;

[0525] a TCI state in the first TCI set that is activated and corresponds to the target cell;

[0526] The TCI state in the first TCI set is in an activated state.

[0527] In some embodiments, the method further comprises:

[0528] Receive sixth information sent by the second network device, where the sixth information indicates a fifth TCI state, and the fifth TCI state is the TCI state of the target cell itself.

[0529] In some embodiments, the sixth information is used to instruct the terminal device to activate the fifth TCI state and deactivate the second TCI state.

[0530] In some embodiments, the terminal device switches to the target cell based on switching without random access.

[0531] FIG4A is a flow chart of a beam indication method according to an embodiment of the present disclosure. As shown in FIG4A , the embodiment of the present disclosure relates to a beam indication method, which can be executed by a first network device. The method includes:

[0532] Step S4101: Send the second information.

[0533] The optional implementation of step S4101 can refer to the optional implementation of step S2101 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0534] In some embodiments, the first network device may send the second information to the terminal device, but is not limited thereto. The first network device may also send the second information to other entities.

[0535] Step S4102: Obtain a first measurement report.

[0536] The optional implementation of step S4102 can refer to the optional implementation of step S2103 in FIG2A and other related parts in the embodiment involved in FIG2A , which will not be described in detail here.

[0537] Step S4103: Send the third information.

[0538] The optional implementation of step S4103 can refer to the optional implementation of step S2104 in FIG2A and other related parts in the embodiment involved in FIG2A , which will not be described in detail here.

[0539] In some embodiments, the first network device may send the third information to the terminal device, but is not limited thereto. The first network device may also send the third information to other entities.

[0540] Step S4104: Send the first information.

[0541] The optional implementation of step S4104 can refer to the optional implementation of step S2105 in FIG2A and other related parts in the embodiment involved in FIG2A , which will not be described in detail here.

[0542] In some embodiments, the first network device may send the first information to the terminal device, but is not limited thereto. The first network device may also send the first information to other entities.

[0543] The method involved in the embodiments of the present disclosure may include at least one of the above steps S4101 to S4104. For example, step S4104 can be implemented as an independent embodiment, step S4101 can be implemented as an independent embodiment, step S4103 can be implemented as an independent embodiment, steps S4103+S4104 can be implemented as an independent embodiment, steps S4101+S4104 can be implemented as an independent embodiment, steps S4101+S4103+S4104 can be implemented as an independent embodiment, and steps S4101+S4102+S4103+S4104 can be implemented as an independent embodiment, but are not limited thereto.

[0544] In some embodiments, the above steps S4101 to S4104 can be executed in a swapped order or simultaneously.

[0545] In some embodiments, the above steps S4101 to S4104 are all optional steps.

[0546] In this way, the first network device can instruct the terminal device to use the first beam during the switching process, and use the second beam for signal transmission after switching to the target cell, thereby providing a flexible beam indication and control method that can improve the switching success rate and communication efficiency.

[0547] FIG4B is a flow chart illustrating a beam direction method according to an embodiment of the present disclosure. As shown in FIG4B , the embodiment of the present disclosure relates to a beam direction method, which can be performed by a first network device. The method may include:

[0548] Step S4201: Send the second information.

[0549] The optional implementation of step S4201 can be found in step S2101 of FIG. 2A , the optional implementation of step S4101 of FIG. 4A , and other related parts in the embodiments involved in FIG. 2A and FIG. 4A , which will not be repeated here.

[0550] Step S4202: Send the third information.

[0551] The optional implementation of step S4202 can be found in step S2103 of FIG. 2A , the optional implementation of step S4103 of FIG. 4A , and other related parts in the embodiments involved in FIG. 2A and FIG. 4A , which will not be described in detail here.

[0552] Step S4203: Send the first information.

[0553] The optional implementation of step S4203 can be found in step S2105 of FIG. 2A , the optional implementation of step S4104 of FIG. 4A , and other related parts in the embodiments involved in FIG. 2A and FIG. 4A , which will not be described in detail here.

[0554] In some embodiments, the above steps are all optional steps.

[0555] In some embodiments, the above steps can be performed in a different order or simultaneously.

[0556] In some embodiments, the embodiment shown in FIG. 4B may also be combined with any one or more steps in the embodiment shown in FIG. 4A to form a new embodiment.

[0557] In this way, the first network device can instruct the terminal device to use the first beam during the switching process, and use the second beam for signal transmission after switching to the target cell, thereby providing a flexible beam indication and control method that can improve the switching success rate and communication efficiency.

[0558] FIG4C is a flow chart illustrating a beam indication method according to an embodiment of the present disclosure. As shown in FIG4C , an embodiment of the present disclosure relates to a beam indication method, which can be performed by a first network device. The method may include:

[0559] Step S4301: Send the first message.

[0560] The optional implementation of step S4301 can be found in step S2105 of FIG. 2A , the optional implementation of step S4104 of FIG. 4A , and other related parts in the embodiments involved in FIG. 2A and FIG. 4A , which will not be described in detail here.

[0561] In some embodiments, the embodiment shown in FIG. 4C may also be combined with any one or more steps in the embodiment shown in FIG. 4A to form a new embodiment.

[0562] In some embodiments, the first information triggers the terminal device to perform a handover to a target cell, and the first network device is a network device corresponding to a current serving cell of the terminal device.

[0563] In this way, the first network device can instruct the terminal device to determine the second beam to be used after switching to the target cell, so that the terminal device switches to the target cell and communicates through the target cell, thereby improving the switching success rate and communication efficiency.

[0564] In some embodiments, the first information includes a first identifier and / or a second identifier, the first identifier is the cell identifier of the target cell, the second identifier is used to determine a first transmission configuration indication TCI state, the first TCI state indicates a first beam, and the first beam is the beam used by the terminal device after switching to the target cell.

[0565] In some embodiments, the method further comprises:

[0566] Send second information to the terminal device, the second information including the first TCI set and the parameters of the candidate cell pre-configured by the first network device for the terminal device, the first TCI set including the TCI status corresponding to the candidate cell, and the candidate cell being the cell configured by the first network device for beam measurement for the terminal device.

[0567] In some embodiments, the method further comprises:

[0568] Send third information to the terminal device, where the third information is for the terminal device to activate the TCI status corresponding to one or more candidate cells in the first TCI set.

[0569] In some embodiments, the first TCI state is any one of the following:

[0570] at least one of the TCI states corresponding to the target cell in the first TCI set;

[0571] At least one of the TCI states in the first TCI set that is in an activated state and corresponds to the target cell.

[0572] In some embodiments, the terminal device determines a second beam through a second TCI state, where the second beam is a beam used by the terminal device after switching to the target cell; the second TCI state is any one of the following:

[0573] the first TCI state;

[0574] At least one TCI state in the first TCI set that is activated and corresponds to the target cell is different from the first TCI state.

[0575] In some embodiments, the TCI state includes a quasi-co-located QCL source, the QCL source including at least one of the following:

[0576] Synchronization signal block SSB of the candidate cell;

[0577] The channel state information reference signal CSI-RS of the candidate cell.

[0578] In some embodiments, the first TCI set is the union of the second TCI sets of each candidate cell, and the second TCI set is the TCI set of the candidate cell itself; or, the first TCI set includes at least one TCI identifier, and one TCI identifier corresponds to one TCI state in the second TCI set.

[0579] In some embodiments, the terminal device switches to the target cell based on switching without random access.

[0580] FIG5A is a flow chart of a beam indication method according to an embodiment of the present disclosure. As shown in FIG5A , the embodiment of the present disclosure relates to a beam indication method, which can be performed by a second network device. The method includes:

[0581] Step S5101: Obtain the seventh information.

[0582] The optional implementation of step S5101 can refer to the optional implementation of step S2107 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0583] Step S5102: Send the fourth information.

[0584] The optional implementation of step S5102 can refer to the optional implementation of step S2108 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0585] In some embodiments, the second network device may send the fourth information to the terminal device, but is not limited thereto. The second network device may also send the fourth information to other entities.

[0586] Step S5103: Send the eighth information.

[0587] The optional implementation of step S5103 can refer to the optional implementation of step S2109 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0588] In some embodiments, the second network device may send the eighth information to the terminal device, but is not limited thereto. The second network device may also send the eighth information to other entities.

[0589] Step S5104: Send the fifth information.

[0590] The optional implementation of step S5104 can refer to the optional implementation of step S2111 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0591] In some embodiments, the second network device may send the fifth information to the terminal device, but is not limited thereto. The second network device may also send the fifth information to other entities.

[0592] Step S5105: Send the sixth information.

[0593] The optional implementation of step S5105 can refer to the optional implementation of step S2112 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0594] In some embodiments, the second network device may send the sixth information to the terminal device, but is not limited thereto. The second network device may also send the sixth information to other entities.

[0595] The method involved in the embodiments of the present disclosure may include at least one of the above steps S5101 to S5105. For example, step S5102 can be implemented as an independent embodiment, step S5104 can be implemented as an independent embodiment, step S5105 can be implemented as an independent embodiment, steps S5101+S5102 can be implemented as an independent embodiment, steps S5102+S5105 can be implemented as an independent embodiment, steps S5101+S5102+S5104 can be implemented as an independent embodiment, and steps S5101+S5102+S5105 can be implemented as an independent embodiment, but the present invention is not limited thereto.

[0596] In some embodiments, the above steps S5101 to S5105 can be executed in a swapped order or simultaneously.

[0597] In some embodiments, the above steps S5101 to S5105 are all optional steps.

[0598] In this way, the second network device can instruct the terminal device to successfully switch to the target cell, provide signal transmission for the terminal device through the second beam, and instruct the terminal device to deactivate or activate the TCI state after switching, thereby providing a flexible beam indication and control method, which can improve the switching success rate and communication efficiency.

[0599] FIG5B is a flow chart illustrating a beam direction method according to an embodiment of the present disclosure. As shown in FIG5B , the embodiment of the present disclosure relates to a beam direction method, which can be performed by a second network device. The method may include:

[0600] Step S5201: Obtain the seventh information.

[0601] The optional implementation of step S5201 can be found in step S2107 of FIG. 2A , the optional implementation of step S5101 of FIG. 5A , and other related parts in the embodiments involved in FIG. 2A and FIG. 5A , which will not be repeated here.

[0602] Step S5202: Send the fourth information.

[0603] The optional implementation of step S5202 can be found in step S2108 of FIG. 2A , the optional implementation of step S5102 of FIG. 5A , and other related parts in the embodiments involved in FIG. 2A and FIG. 5A , which will not be described in detail here.

[0604] Step S5203: Send the sixth information.

[0605] The optional implementation of step S5203 can be found in step S2112 of FIG. 2A , the optional implementation of step S5105 of FIG. 5A , and other related parts in the embodiments involved in FIG. 2A and FIG. 5A , which will not be repeated here.

[0606] In some embodiments, the above steps are all optional steps.

[0607] In some embodiments, the above steps can be performed in a different order or simultaneously.

[0608] In some embodiments, the embodiment shown in FIG. 5B may also be combined with any one or more steps in the embodiment shown in FIG. 5A to form a new embodiment.

[0609] In this way, the second network device can instruct the terminal device to successfully switch to the target cell, provide signal transmission for the terminal device through the second beam, and instruct the terminal device to activate the TCI state after switching, thereby providing a flexible beam indication and control method, which can improve the switching success rate and communication efficiency.

[0610] FIG5C is a flow chart illustrating a beam indication method according to an embodiment of the present disclosure. As shown in FIG5C , the embodiment of the present disclosure relates to a beam indication method, which can be performed by a second network device. The method may include:

[0611] Step S5301: Send the fourth information.

[0612] The optional implementation of step S5301 can be found in step S2108 of FIG. 2A , the optional implementation of step S5102 of FIG. 5A , and other related parts in the embodiments involved in FIG. 2A and FIG. 5A , which will not be described in detail here.

[0613] In some embodiments, the embodiment shown in FIG. 5C may also be combined with any one or more steps in the embodiment shown in FIG. 5A to form a new embodiment.

[0614] In some embodiments, the fourth information is used to determine that the terminal device has successfully switched to the target cell, and the second network device is the network device corresponding to the target cell.

[0615] In this way, the second network device can instruct the terminal device to successfully switch to the target cell, thereby improving the switching success rate and communication efficiency.

[0616] In some embodiments, the fourth information is the first scheduled new transmission of the terminal device on the target cell; or, the fourth information is preset information, and the preset information is transmitted on the physical downlink shared channel PDSCH of the first scheduling of the target cell.

[0617] In some embodiments, the method further comprises:

[0618] Send fifth information to the terminal device, the fifth information instructing the terminal device to deactivate the third TCI state, the third TCI state is all or part of the TCI state in the first TCI set, the first TCI set includes the TCI state corresponding to the candidate cell, and the candidate cell is the cell configured by the first network device for the terminal device to perform beam measurement.

[0619] In some embodiments, the TCI state includes a quasi-co-located QCL source, the QCL source including at least one of the following:

[0620] Synchronization signal block SSB of the candidate cell;

[0621] The channel state information reference signal CSI-RS of the candidate cell.

[0622] In some embodiments, the first TCI set is the union of the second TCI sets of each candidate cell, and the second TCI set is the TCI set of the candidate cell itself; or, the first TCI set includes at least one TCI identifier, and one TCI identifier corresponds to one TCI state in the second TCI set.

[0623] In some embodiments, the method further comprises:

[0624] Send sixth information to the terminal device, where the sixth information indicates a fifth TCI state, and the fifth TCI state is the TCI state of the target cell itself.

[0625] In some embodiments, the sixth information is used to instruct the terminal device to activate the fifth TCI state and deactivate the second TCI state.

[0626] In some embodiments, the terminal device switches to the target cell based on switching without random access.

[0627] FIG6 is a flow chart of a beam indication method according to an embodiment of the present disclosure. As shown in FIG6 , an embodiment of the present disclosure relates to a beam indication method, which can be performed by a communication system and may include:

[0628] Step S6101: The first network device sends second information to the terminal device.

[0629] In some embodiments, the terminal device may receive the second information.

[0630] In some embodiments, the first network device may be a network device corresponding to a service cell of the terminal device.

[0631] In some embodiments, the second information can be used to pre-configure a second parameter for switching for the terminal device, and the second parameter may include at least one of the following: RRC parameters of at least one candidate cell; beam indication TCI states during switching; a first TCI set, which can also be called an LTM TCI state pool.

[0632] In some embodiments, the second information can be used to pre-configure RRC parameters of each candidate cell for the terminal device, and to indicate TCI states during the switching process.

[0633] In some embodiments of the present disclosure, the first TCI set may have different forms.

[0634] In some embodiments, the first TCI set is designed independently (not associated) with the TCI set (second TCI set) of each candidate cell. For example:

[0635] In one implementation, the QCL source in the first TCI set is an SSB for beamforming measurement.

[0636] In another implementation, the QCL in the first TCI set is a TRS, the TRS information can be independently configured, and the QCL source of the TRS is the SSB measured by L1. Optionally, the TRS information can be included in the second information.

[0637] In some other embodiments, the first TCI set is associated with the TCI set (second TCI set) of each candidate cell (non-independent design), for example:

[0638] In one implementation, the first TCI set is an independent set, but the TCI state configuration in the first TCI set is exactly the same as the TCI state of the candidate cell.

[0639] In another implementation, the first TCI set may only include an ID list of TCI states configured in each candidate cell.

[0640] Step S6102: The first network device sends third information to the terminal device.

[0641] In some embodiments, the terminal device may receive the third information.

[0642] In some embodiments, the third information may be to activate one or more TCI states in the first TCI set for the terminal device.

[0643] In some embodiments, the third information may be a TCI state for activating one or more candidate cells for the terminal device.

[0644] Step S6103: The first network device sends first information to the terminal device.

[0645] In some embodiments, the first information may be used to trigger user switching to a target cell and indicate a transmission beam of the target cell.

[0646] In some embodiments, the first information may include at least a first identifier and a second identifier, the first identifier may be a cell identifier of the target cell, and the second identifier may be a TCI state identifier.

[0647] Step S6104: The terminal device sends seventh information to the second network device.

[0648] In some embodiments, the second network device may receive the seventh information.

[0649] In some embodiments, the seventh information can be used to instruct the terminal device to access the second network device.

[0650] In some embodiments, the seventh information may be first uplink data (First UL data).

[0651] In some embodiments, the terminal device may send the seventh information via the first beam.

[0652] Step S6105: The second network device sends fourth information to the terminal device.

[0653] In some embodiments, the terminal device may receive the fourth information sent by the second network device, determine that the target cell has been successfully accessed, and complete the handover.

[0654] In some embodiments, the fourth information is the first scheduled new transmission (new transmission resource PUSCH / PDSCH).

[0655] In some embodiments, the fourth information is a specific message specified by the protocol and is transmitted on the PDSCH scheduled for the first time in the target cell.

[0656] In some embodiments, the fourth information is a PDCCH for scheduling new transmission data (PDCCH scheduling a new transmission).

[0657] Step S6106: The terminal device determines the transmission beam of the target cell.

[0658] In some embodiments, the terminal device may determine the transmission beam of the target cell after the handover is completed. Optionally, the transmission beam of the target cell may also be referred to as the first beam.

[0659] In some embodiments, the terminal device may determine an activated first TCI state, and determine a transmission beam (ie, a first beam) of the target cell based on the activated first TCI state.

[0660] In some embodiments, different methods may be used to determine the activated first TCI state according to different forms of the first TCI set (LTM TCI state).

[0661] In some embodiments, the first TCI set is independently designed, and the source reference signal is SSB.

[0662] For example, the first TCI set is designed independently (not associated) with the TCI sets of each candidate cell (the second TCI set), and the QCL source in the first TCI set is the SSB used for beam measurement.

[0663] In an optional implementation, after the handover is completed, all activated LTM TCI states are deactivated by default, except for the TCI state indicated by the handover signaling. Before the target cell indicates the TCI state configured by itself, the beam indicated in the first information can be used.

[0664] The target cell indication method may be to activate a TCI state through MAC CE, or to indicate through DCI after activating multiple TCI states through MAC CE.

[0665] In another optional implementation, the terminal device can retain all activated LTM TCI states (that is, retain the LTM TCI state activated before the cell handover) to support subsequent LTM.

[0666] Optionally, active zone activation or signaling can be introduced to deactivate the LTM TCI state. This can avoid the terminal device having to maintain all activated LTM TCI states. By deactivating some or all LTM TCI states, the power consumption of the terminal device can be reduced.

[0667] Optionally, before the target cell indicates its own TCI state, the LTM TCI state is continued to be used for subsequent beam indication, but identification differentiation needs to be introduced.

[0668] In some other embodiments, the first TCI set is independently designed, and the source reference signal is a TRS.

[0669] In an optional implementation, after the handover is completed, all activated LTM TCI states except the TCI state indicated by the handover signaling are deactivated. Before the target cell indicates the TCI state configured by itself, the beam indicated in the handover signaling can be used.

[0670] In another optional implementation, the LTM TCI states of other candidate cells are all deactivated, but the LTM TCI states of the target cell are maintained activated.

[0671] Optionally, before the target cell activates its own TCI state, it may continue to use the activated LTM TCI state for subsequent beam indication. Optionally, it may be limited to the activated LTM TCI states.

[0672] Optionally, an identifier may be introduced into the activation information / indication signaling, and the identifier is used to distinguish whether the activation / indication is the LTM TCI state or the TCI state of the target cell.

[0673] In another optional implementation, the terminal device may retain all activated LTM TCI states to facilitate support for subsequent LTM. In this case, explicit deactivation signaling may be defined.

[0674] Optionally, the target cell may indicate its own TCI state, and before the indication, the terminal device uses the beam indicated by the switching signaling.

[0675] Optionally, it is allowed to continue to use the LTM TCI state for subsequent beam indication before the target cell indicates its own TCI state, but it is necessary to introduce an identifier to distinguish it.

[0676] In some other embodiments, the TCI state in the first TCI set is associated with the TCI state of the candidate cell. The first TCI set may be an independent set, but the TCI state configuration in the first TCI set is exactly the same as the TCI state of the candidate cell.

[0677] Optionally, the beam can be determined using the source reference signal (SSB) of the CSI-RS in the indicated TCI state. Optionally, to avoid the serving cell having to process the CSI-RS configuration information of each candidate cell, the configuration of the CSI-RS as the QCL source can be placed outside the configuration of each candidate cell, for example, in the second information used to configure the first TCI set.

[0678] In an optional implementation, the TCI state configuration in the first TCI set is exactly the same as the TCI state of the candidate cell. It is considered that the LTM TCI states of the target cell remain activated after the handover is completed, and the TCI state configured in the target cell itself is also considered to be activated. These activated TCI states can be directly indicated, and the reactivated TCI states indicated in subsequent default signaling are all the TCI states of the target cell itself.

[0679] In another optional implementation, all activated LTM TCI states can be retained to facilitate support for subsequent LTM, and explicit deactivation signaling can also be introduced. It can also be considered that the TCI state configured by the target cell itself is also activated, and the subsequent target cell can directly indicate these activated TCI states

[0680] In some other embodiments, the first TCI set only includes an ID list of TCI states configured in each candidate cell.

[0681] The serving cell needs to process the RRC parameters of each candidate cell in advance to obtain the TCI state and CSI-RS configuration and enter beam indication.

[0682] Optionally, there may be no actual LTM TCI state, and the beam indication during and after handover is actually the TCI state of the target cell itself.

[0683] It should be noted that step S6106 can be executed after any one of steps S6101 to S6105.

[0684] Step S6107: The second network device sends sixth information to the terminal device.

[0685] In some embodiments, the terminal device may receive sixth information sent by the second network device.

[0686] In some embodiments, the sixth information may be used to indicate a TCI state of the target cell. The TCI state is different from the LTM TCI state, but is a TCI state under the user's own RRC parameters.

[0687] In some embodiments, the sixth information is a MAC CE.

[0688] In other embodiments, the sixth information is DCI.

[0689] In some embodiments of the present disclosure, the first TCI set may be an LTM TCI state pool. Based on the LTM TCI state pool, any of the following beam indication methods may be designed:

[0690] Method 1: The LTM TCI state pool and the TCI state pool of each candidate cell are designed independently.

[0691] The first method may include the following example 1 and example 2.

[0692] Example 1: The QCL source in the LTM TCI state is the SSB used for beam measurement. In this case, the LTM TCI state can only be used during the handover process. After the handover is completed, the TCI state of the target cell needs to be used for beam indication. Specifically,

[0693] Optionally, after the handover is completed, all activated LTM TCI states, except the TCI state indicated by the handover signaling, are deactivated by default.

[0694] Before the target cell indicates the TCI state configured in its own cell, the beam indicated in the handover signaling is used. The indication here is when the MAC CE activates a TCI state, or when the MAC CE activates multiple TCI states and then indicates through the DCI

[0695] Optionally, all LTM TCI states activated before cell switch are retained to support subsequent LTM.

[0696] At this time, deactivation signaling is introduced to deactivate the LTM TCI state, otherwise the user will need to maintain all activated LTM TCI states.

[0697] The beam indicated by the handover signaling is used until the target cell indicates its own TCI state.

[0698] Example 2: In the LTM TCI state, the QCL is a TRS, the TRS information is independently configured, and the TRS QCL source is the SSB measured by L1. The TRS can be a CSI-RS.

[0699] The transmission beam can be determined by using the same beam as the source reference signal SSB of TRS in the TCI state.

[0700] The beam indication after switching may include multiple methods, for example:

[0701] For example, after the handover is completed, all activated LTM TCI states are deactivated except the TCI state indicated by the handover signaling. Before the target cell indicates the TCI state configured by itself, the beam indicated in the handover signaling is used.

[0702] For another example, all other candidate cells are deactivated, but the LTM TCI states of the activated target cell are maintained. Optionally, before the target cell activates its own TCI state, the LTM TCI state can continue to be used for subsequent beam indication. Optionally, it can be specified that only the activated LTM TCI states are used. An identifier is introduced in the activation information / indication signaling to distinguish whether the activation / indication is the LTM TCI state or the TCI state of the target cell.

[0703] For another example, retaining all activated LTM TCI states is convenient for supporting subsequent LTM, in which case explicit deactivation signaling is required (unlike Option 1-Case 2, where TCI can be used for transmission, while Option 1-Case 2 TCI can only be used for measurement). Optionally, it can be stipulated that the target cell must indicate its own TCI state, and use the beam indicated by the handover signaling before the indication. Alternatively, it can be allowed to continue to use the LTM TCI state for subsequent beam indication before the target cell indicates its own TCI state, but it is necessary to introduce an identifier to distinguish them.

[0704] Method 2: The TCI state in the LTM TCI state pool is associated with the TCI state of the candidate cell.

[0705] The second method may include the following example three and example four.

[0706] Example 3: Independent pool, but the TCI state configuration in the pool is exactly the same as the TCI state of the candidate cell

[0707] Optionally, the beam determination method may include: using the source reference signal SSB of the CSI-RS in the indicated TCI state. In order to avoid the serving cell having to process the CSI-RS configuration information of each candidate cell, the configuration of the CSI-RS as the QCL source can also be placed outside the configuration of each candidate cell.

[0708] The beam indication after switching may include multiple methods, for example:

[0709] For example, since the LTM TCI states are identical, consider retaining the activated target cell's LTM TCI states after handover, and consider the TCI states configured in the target cell itself to be activated. These activated TCI states can be directly indicated, and any subsequent default signaling indicates reactivation of the target cell's own TCI state.

[0710] For example, retaining all activated LTM TCI states to facilitate support for subsequent LTM also requires explicit deactivation signaling. Similarly, the TCI states configured in the target cell itself can also be considered activated, and the target cell can subsequently directly indicate these activated TCI states.

[0711] Example 4: The LTM TCI state pool only contains an ID list of the TCI state configured under each candidate cell.

[0712] The serving cell needs to process the RRC parameters of each candidate cell in advance to obtain the TCI state and CSI-RS configuration and enter beam indication.

[0713] At this time, there is no actual LTM TCI state, and the beam indication during and after handover is actually the TCI state of the target cell itself.

[0714] In this way, through the above-mentioned beam indication method, the transmission beam of the target cell can be indicated to the terminal device during the switching process, so that the terminal device can successfully switch to the target cell and be provided with data services by the target cell.

[0715] In some embodiments of the present disclosure, a communication system is provided, which may include a terminal device, a first network device, and a second network device, wherein the terminal device can execute the beam indication method executed by the terminal device in the aforementioned embodiment of the present disclosure; the first network device can execute the beam indication method executed by the first network device in the aforementioned embodiment of the present disclosure; and the second network device can execute the beam indication method executed by the second network device in the aforementioned embodiment of the present disclosure.

[0716] The embodiments of the present disclosure further provide an apparatus for implementing any of the above methods. For example, an apparatus is provided, comprising units or modules for implementing each step performed by a terminal device in any of the above methods. For another example, another apparatus is provided, comprising units or modules for implementing each step performed by a network device (e.g., an access network device, a core network function node, a core network device, etc.) in any of the above methods.

[0717] It should be understood that the division of the various units or modules in the above device is merely a division of logical functions. In actual implementation, they may be fully or partially integrated into a physical entity, or they may be physically separated. In addition, the units or modules in the device may be implemented in the form of a processor calling software: for example, the device includes a processor, the processor is connected to a memory, and the memory stores instructions. The processor calls the instructions stored in the memory to implement any of the above methods or implement the functions of the various units or modules of the above device, wherein the processor is, for example, a general-purpose 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 circuits, and the functions of some or all of the units or modules can be realized by designing the hardware circuits. The above-mentioned hardware circuits can be understood as one or more processors; for example, in one implementation, the above-mentioned hardware circuit is an application-specific integrated circuit (ASIC), and the functions of some or all of the above units or modules are realized by designing the logical relationship of the components in the circuit; for example, in another implementation, the above-mentioned hardware circuit can be realized by a programmable logic device (PLD). Taking a field programmable gate array (FPGA) as an example, it can include a large number of logic gate circuits, and the connection relationship between the logic gate circuits is configured by configuring the configuration file, thereby realizing the functions of some or all of the above units or modules. All units or modules of the above devices can be realized in the form of software called by the processor, or in the form of hardware circuits, or in part by the form of software called by the processor, and the rest by hardware circuits.

[0718] In the embodiments of the present disclosure, the processor is a circuit with signal processing capabilities. In one implementation, the processor can be a circuit with instruction reading and execution capabilities, such as a central processing unit (CPU), a microprocessor, a graphics processing unit (GPU) (which can be understood as a microprocessor), or a digital signal processor (DSP). In another implementation, the processor can implement certain functions through the logical relationship of a hardware circuit. The logical relationship of the above-mentioned hardware circuit is fixed or reconfigurable. 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 a reconfigurable hardware circuit, the process of the processor loading a configuration document to implement the hardware circuit configuration can be understood as the process of the processor loading instructions to implement the functions of some or all of the above units or modules. In addition, it can also be a hardware circuit designed for artificial intelligence, which can be understood as ASIC, such as a neural network processing unit (NPU), a tensor processing unit (TPU), a deep learning processing unit (DPU), etc.

[0719] Figure 7A is a structural diagram of a terminal device proposed in an embodiment of the present disclosure. As shown in Figure 7A, the terminal device 101 may include: at least one of a transceiver module 7101, a processing module 7102, etc. In some embodiments, the transceiver module 7101 is configured to receive first information sent by a first network device, the first information triggering the terminal device to perform a handover to a target cell, the first network device being the network device corresponding to the current serving cell of the terminal device; the processing module 7102 is configured to determine a first transmission configuration indication TCI state according to the first information, the first TCI state indicating a first beam, the first beam being the beam used by the terminal device in performing a handover to the target cell; and determine a second TCI state, the second TCI state indicating a second beam, the second beam being the beam used by the terminal device after switching to the target cell, the second TCI state being the same as or different from the first TCI state.

[0720] In some embodiments, the first information includes a first identifier and / or a second identifier, the first identifier is a cell identifier of the target cell, and the second identifier is used to determine the first TCI state.

[0721] In some embodiments, the transceiver module 7101 is further configured to receive second information sent by the first network device, the second information including the first TCI set and parameters of the candidate cell pre-configured by the first network device for the terminal device, the first TCI set including the TCI status corresponding to the candidate cell, and the candidate cell being the cell configured by the first network device for beam measurement for the terminal device.

[0722] In some embodiments, the transceiver module 7101 is further configured to receive third information sent by the first network device, where the third information is the TCI status corresponding to the activation of one or more candidate cells in the first TCI set by the terminal device.

[0723] In some embodiments, the first TCI state is any one of the following:

[0724] at least one of the TCI states corresponding to the target cell in the first TCI set;

[0725] At least one of the TCI states in the first TCI set that is in an activated state and corresponds to the target cell.

[0726] In some embodiments, the second TCI state is any one of the following:

[0727] the first TCI state;

[0728] At least one TCI state in the first TCI set that is activated and corresponds to the target cell is different from the first TCI state.

[0729] In some embodiments, the transceiver module 7101 is further configured to receive fourth information sent by a second network device, where the second network device is a network device corresponding to the target cell, and the fourth information is used to determine that the terminal device has successfully switched to the target cell.

[0730] In some embodiments, the fourth information is the first scheduled new transmission of the terminal device on the target cell; or, the fourth information is preset information, and the preset information is transmitted on the physical downlink shared channel PDSCH of the first scheduling of the target cell.

[0731] In some embodiments, the transceiver module 7101 is further configured to receive fifth information sent by the second network device, wherein the fifth information instructs the terminal device to deactivate a third TCI state, where the third TCI state is all or part of the TCI state in the first TCI set.

[0732] In some embodiments, the TCI state includes a quasi-co-located QCL source, the QCL source including at least one of the following:

[0733] Synchronization signal block SSB of the candidate cell;

[0734] The channel state information reference signal CSI-RS of the candidate cell.

[0735] In some embodiments, the first TCI set is the union of the second TCI sets of each candidate cell, and the second TCI set is the TCI set of the candidate cell itself; or, the first TCI set includes at least one TCI identifier, and one TCI identifier corresponds to one TCI state in the second TCI set.

[0736] In some embodiments, the processing module 7102 is further configured to determine that after the terminal device switches to the target cell, a fourth TCI state is maintained in an activated state, where the fourth TCI state includes any one of the following:

[0737] the first TCI state;

[0738] a TCI state in the first TCI set that is activated and corresponds to the target cell;

[0739] The TCI state in the first TCI set is in an activated state.

[0740] In some embodiments, the transceiver module 7101 is further configured to receive sixth information sent by the second network device, where the sixth information indicates a fifth TCI state, and the fifth TCI state is the TCI state of the target cell itself.

[0741] In some embodiments, the sixth information is used to instruct the terminal device to activate the fifth TCI state and deactivate the second TCI state.

[0742] In some embodiments, the terminal device switches to the target cell based on switching without random access.

[0743] Figure 7B is a schematic diagram of the structure of a first network device according to an embodiment of the present disclosure. As shown in Figure 7B , the first network device 1021 may include at least one of a transceiver module 7201 and a processing module 7202. In some embodiments, the transceiver module 7201 is configured to send first information to a terminal device, the first information triggering the terminal device to perform a handover to a target cell. The first network device is the network device corresponding to the terminal device's current serving cell.

[0744] In some embodiments, the first information includes a first identifier and / or a second identifier, the first identifier is the cell identifier of the target cell, the second identifier is used to determine a first transmission configuration indication TCI state, the first TCI state indicates a first beam, and the first beam is the beam used by the terminal device after switching to the target cell.

[0745] In some embodiments, the transceiver module 7201 is configured to send second information to the terminal device, where the second information includes parameters of a first TCI set and a candidate cell pre-configured by the first network device for the terminal device, where the first TCI set includes a TCI status corresponding to the candidate cell, and the candidate cell is a cell configured by the first network device for beam measurement for the terminal device.

[0746] In some embodiments, the transceiver module 7201 is configured to send third information to the terminal device, where the third information is the TCI status corresponding to one or more candidate cells in the first TCI set activated by the terminal device.

[0747] In some embodiments, the first TCI state is any one of the following

[0748] at least one of the TCI states corresponding to the target cell in the first TCI set;

[0749] At least one of the TCI states in the first TCI set that is in an activated state and corresponds to the target cell.

[0750] In some embodiments, the terminal device determines a second beam through a second TCI state, where the second beam is a beam used by the terminal device after switching to the target cell; the second TCI state is any one of the following:

[0751] the first TCI state;

[0752] At least one TCI state in the first TCI set that is activated and corresponds to the target cell is different from the first TCI state.

[0753] In some embodiments, the TCI state includes a quasi-co-located QCL source, the QCL source including at least one of the following:

[0754] Synchronization signal block SSB of the candidate cell;

[0755] The channel state information reference signal CSI-RS of the candidate cell.

[0756] In some embodiments, the first TCI set is the union of the second TCI sets of each candidate cell, and the second TCI set is the TCI set of the candidate cell itself; or, the first TCI set includes at least one TCI identifier, and one TCI identifier corresponds to one TCI state in the second TCI set.

[0757] In some embodiments, the terminal device switches to the target cell based on switching without random access.

[0758] Figure 7C is a schematic diagram of the structure of a second network device according to an embodiment of the present disclosure. As shown in Figure 7C , the second network device 1022 may include at least one of a transceiver module 7301 and a processing module 7302. In some embodiments, the transceiver module 7301 is configured to send fourth information to a terminal device, the fourth information being used to confirm that the terminal device has successfully switched to a target cell, and the second network device is the network device corresponding to the target cell.

[0759] In some embodiments, the fourth information is the first scheduled new transmission of the terminal device on the target cell; or, the fourth information is preset information, and the preset information is transmitted on the physical downlink shared channel PDSCH of the first scheduling of the target cell.

[0760] In some embodiments, the transceiver module 7301 is configured to send fifth information to the terminal device, wherein the fifth information instructs the terminal device to deactivate a third TCI state, wherein the third TCI state is all or part of the TCI state in the first TCI set, wherein the first TCI set includes TCI states corresponding to candidate cells, and the candidate cells are cells configured by the first network device for beam measurement for the terminal device.

[0761] In some embodiments, the TCI state includes a quasi-co-located QCL source, the QCL source including at least one of the following:

[0762] Synchronization signal block SSB of the candidate cell;

[0763] The channel state information reference signal CSI-RS of the candidate cell.

[0764] In some embodiments, the first TCI set is the union of the second TCI sets of each candidate cell, and the second TCI set is the TCI set of the candidate cell itself; or, the first TCI set includes at least one TCI identifier, and one TCI identifier corresponds to one TCI state in the second TCI set.

[0765] In some embodiments, the transceiver module 7301 is configured to send sixth information to the terminal device, where the sixth information indicates a fifth TCI state, and the fifth TCI state is the TCI state of the target cell itself.

[0766] In some embodiments, the sixth information is used to instruct the terminal device to activate the fifth TCI state and deactivate the second TCI state.

[0767] In some embodiments, the terminal device switches to the target cell based on switching without random access.

[0768] In some embodiments, the transceiver module may include a transmitting module and / or a receiving module, and the transmitting module and the receiving module may be separate or integrated. Optionally, the transceiver module may be interchangeable with the transceiver.

[0769] In some embodiments, the processing module can be a single module or can include multiple submodules. Optionally, the multiple submodules respectively execute all or part of the steps required to be executed by the processing module. Optionally, the processing module can be interchangeable with the processor.

[0770] Figure 8A is a schematic diagram of the structure of a communication device 8100 proposed in an embodiment of the present disclosure. Communication device 8100 can be a network device (e.g., an access network device, a core network device, a first network device, a second network device, etc.), or a terminal device (e.g., a user device, etc.). It can also be a chip, chip system, or processor that supports a network device to implement any of the above methods, or a chip, chip system, or processor that supports a terminal device to implement any of the above methods. Communication device 8100 can be used to implement the methods described in the above method embodiments. For details, please refer to the description of the above method embodiments.

[0771] As shown in Figure 8A, the communication device 8100 includes one or more processors 8101. The processor 8101 can be a general-purpose processor or a dedicated processor, for example, a baseband processor or a central processing unit. The baseband processor can be used to process the communication protocol and communication data, and the central processing unit can be used to control the communication device (such as a base station, a baseband chip, a terminal device, a terminal device chip, a DU or a CU, etc.), execute programs, and process program data. Optionally, the communication device 8100 can be used to perform any of the above methods. Optionally, one or more processors 8101 are used to call instructions to enable the communication device 8100 to perform any of the above methods.

[0772] In some embodiments, the communication device 8100 may further include one or more transceivers 8102. When the communication device 8100 includes one or more transceivers 8102, the transceiver 8102 may perform at least one of the communication steps such as sending and / or receiving in the above method (for example, step S2101, step S2103, step S2104, step S2105, step S2107, step S2108, step S2111, and step S2112, but not limited thereto), and the processor 8101 may perform at least one of the other steps (for example, step S2102, step S2106, and step S2110, but not limited thereto).

[0773] In some embodiments, a transceiver may include a receiver and / or a transmitter. The receiver and transmitter may be separate or integrated. Optionally, the terms transceiver, transceiver unit, transceiver, transceiver circuit, interface circuit, and interface may be used interchangeably; the terms transmitter, transmitting unit, transmitter, and transmitting circuit may be used interchangeably; and the terms receiver, receiving unit, receiver, and receiving circuit may be used interchangeably.

[0774] 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 may be located outside the communication device 8100. In alternative embodiments, the communication device 8100 may include one or more interface circuits 8104. Optionally, the interface circuits 8104 are connected to the memories 8103 and may be configured to receive data from the memories 8103 or other devices, or to send data to the memories 8103 or other devices. For example, the interface circuits 8104 may read data stored in the memories 8103 and send the data to the processor 8101.

[0775] The communication device 8100 described in the above embodiment may be a network device or a terminal device, 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 may not be limited by FIG. 8A. The communication device may be an independent device or may be part of a larger device. For example, the communication device may be: (1) an independent integrated circuit IC, or a chip, or a chip system or subsystem; (2) a collection of one or more ICs, optionally, the above IC collection may also include a storage component for storing data or programs; (3) an ASIC, such as a modem; (4) a module that can be embedded in other devices; (5) a receiver, a terminal device, an intelligent terminal device, a cellular phone, a wireless device, a handheld device, a mobile unit, an in-vehicle device, a network device, a cloud device, an artificial intelligence device, etc.; (6) others, etc.

[0776] FIG8B is a schematic diagram of the structure of a chip 8200 according to an embodiment of the present disclosure. If the communication device 8100 can be a chip or a chip system, please refer to the schematic diagram of the structure of the chip 8200 shown in FIG8B , but the present disclosure is not limited thereto.

[0777] The chip 8200 includes one or more processors 8201 , and the chip 8200 is configured to execute any of the above methods.

[0778] In some embodiments, chip 8200 further includes one or more interface circuits 8204. Alternatively, the terms interface circuit, interface, and transceiver pins may be used interchangeably. In some embodiments, chip 8200 further includes one or more memories 8203 for storing data. Alternatively, all or part of memories 8203 may be located external to chip 8200.

[0779] Optionally, the interface circuit 8204 is connected to the memory 8203. The interface circuit 8204 can be used to receive data from the memory 8203 or other devices, and the interface circuit 8204 can be used to send data to the memory 8203 or other devices. For example, the interface circuit 8204 can read data stored in the memory 8203 and send the data to the processor 8201.

[0780] In some embodiments, the interface circuit 8204 performs at least one of the communication steps of sending and / or receiving in the above method (e.g., step S2101, step S2103, step S2104, step S2105, step S2107, step S2108, step S2111, and step S2112, but not limited thereto). The interface circuit 8204 performing the communication steps of sending and / or receiving in the above method, for example, means that the interface circuit 8204 performs data exchange between the processor 8201, chip 8200, memory 8203, or transceiver device. In some embodiments, the processor 8201 may perform at least one of the other steps (e.g., step S2102, step S2106, and step S2110, but not limited thereto).

[0781] The modules and / or devices described in various embodiments, such as virtual devices, physical devices, and chips, can be arbitrarily combined or separated according to circumstances. Optionally, some or all steps can also be performed collaboratively by multiple modules and / or devices, which is not limited here.

[0782] The embodiments of the present disclosure further provide a storage medium having instructions stored thereon. When the instructions are executed on the communication device 8100, the communication device 8100 executes any of the above methods. Optionally, the storage medium is an electronic storage medium. Optionally, the storage medium is a computer-readable storage medium, but is not limited thereto and may also be a storage medium readable by other devices. Optionally, the storage medium may be a non-transitory storage medium, but is not limited thereto and may also be a temporary storage medium.

[0783] The present disclosure also provides a program product, which, when executed by the communication device 8100, enables the communication device 8100 to perform any of the above methods. Optionally, the program product may be a computer program product.

[0784] The embodiments of the present disclosure also provide a computer program, which, when executed on a computer, enables the computer to execute any one of the above methods.

Claims

1. A beam indication method, It is characterized in that Executed by a terminal device, the method includes: Receiving first information sent by a first network device, where the first information triggers the terminal device to perform a handover to a target cell, and the first network device is a network device corresponding to a current serving cell of the terminal device; Determine a first transmission configuration indication TCI state according to the first information, where the first TCI state indicates a first beam, and the first beam is a beam used by the terminal device in a process of performing a handover to the target cell; Determine a second TCI state, where the second TCI state indicates a second beam, where the second beam is the beam used by the terminal device after switching to the target cell, and the second TCI state is the same as or different from the first TCI state.

2. The method according to claim 1, It is characterized in that The first information includes a first identifier and / or a second identifier, the first identifier is a cell identifier of the target cell, and the second identifier is used to determine the first TCI state.

3. The method according to claim 1 or 2, It is characterized in that The method further comprises: Receive second information sent by the first network device, the second information including parameters of a first TCI set and a candidate cell preconfigured by the first network device for the terminal device, the first TCI set including a TCI state corresponding to the candidate cell, and the candidate cell being a cell configured by the first network device for beam measurement for the terminal device.

4. The method according to claim 3, It is characterized in that The method further comprises: Receive the third information sent by the first network device, where the third information is the TCI state corresponding to the activation of one or more candidate cells in the first TCI set by the terminal device.

5. The method according to claim 3 or 4, It is characterized in that The first TCI status is any one of the following: at least one of the TCI states corresponding to the target cell in the first TCI set; At least one of the TCI states in the first TCI set that is in an activated state and corresponds to the target cell.

6. The method according to any one of claims 3 to 5, It is characterized in that The second TCI status is any one of the following: the first TCI state; At least one of the TCI states in the first TCI set that is activated and corresponds to the target cell is different from the first TCI state.

7. The method according to any one of claims 3 to 6, It is characterized in that The method further comprises: Receive fourth information sent by a second network device, where the second network device is a network device corresponding to the target cell, and the fourth information is used to determine whether the terminal device has successfully switched to the target cell.

8. The method according to claim 7, It is characterized in that The fourth information is the first scheduling new transmission of the terminal device on the target cell; or, The fourth information is preset information, and the preset information is transmitted on a physical downlink shared channel PDSCH scheduled for the first time by the target cell.

9. The method according to any one of claims 3 to 8, It is characterized in that The method further comprises: Receive the fifth information sent by the second network device, where the fifth information instructs the terminal device to deactivate a third TCI state, where the third TCI state is all or part of the TCI states in the first TCI set.

10. The method according to any one of claims 3 to 9, It is characterized in that The TCI state includes a quasi-co-located QCL source, wherein the QCL source includes at least one of the following: Synchronization signal block SSB of the candidate cell; The channel state information reference signal CSI-RS of the candidate cell.

11. The method according to any one of claims 3 to 9, It is characterized in that The first TCI set is a union of the second TCI sets of each candidate cell, and the second TCI set is the TCI set of the candidate cell itself; or, The first TCI set includes at least one TCI identifier, and one TCI identifier corresponds to one TCI state in the second TCI set.

12. The method according to any one of claims 3 to 11, It is characterized in that The method further comprises: After determining that the terminal device switches to the target cell, keep the fourth TCI state in an activated state, where the fourth TCI state includes any one of the following: the first TCI state; A TCI state in the first TCI set that is in an activated state and corresponds to the target cell; The TCI states in the first TCI set are in an activated state.

13. The method according to any one of claims 1 to 12, It is characterized in that The method further comprises: Receive sixth information sent by the second network device, where the sixth information indicates a fifth TCI state, and the fifth TCI state is the TCI state of the target cell itself.

14. The method according to claim 13, It is characterized in that The sixth information is used to instruct the terminal device to activate the fifth TCI state and deactivate the second TCI state.

15. A beam indication method, It is characterized in that Executed by a first network device, the method includes: A first information is sent to a terminal device, wherein the first information triggers the terminal device to perform a switch to a target cell, and the first network device is a network device corresponding to a current serving cell of the terminal device.

16. The method according to claim 15, It is characterized in that The first information includes a first identifier and / or a second identifier, the first identifier is the cell identifier of the target cell, the second identifier is used to determine a first transmission configuration indication TCI state, the first TCI state indicates a first beam, and the first beam is the beam used by the terminal device after switching to the target cell.

17. The method according to claim 16, It is characterized in that The method further comprises: Send second information to the terminal device, the second information including parameters of a first TCI set and a candidate cell preconfigured by the first network device for the terminal device, the first TCI set including a TCI state corresponding to the candidate cell, and the candidate cell being a cell configured by the first network device for beam measurement for the terminal device.

18. The method according to claim 17, It is characterized in that The method further comprises: Send third information to the terminal device, where the third information is for the terminal device to activate the TCI status corresponding to one or more candidate cells in the first TCI set.

19. The method according to claim 17 or 18, It is characterized in that The first TCI status is any one of the following: at least one of the TCI states corresponding to the target cell in the first TCI set; At least one of the TCI states in the first TCI set that is in an activated state and corresponds to the target cell.

20. The method according to any one of claims 17 to 19, It is characterized in that The terminal device determines a second beam through a second TCI state, where the second beam is a beam used by the terminal device after switching to the target cell; the second TCI state is any one of the following: the first TCI state; At least one of the TCI states in the first TCI set that is activated and corresponds to the target cell is different from the first TCI state.

21. The method according to any one of claims 17 to 20, It is characterized in that The TCI state includes a quasi-co-located QCL source, wherein the QCL source includes at least one of the following: Synchronization signal block SSB of the candidate cell; The channel state information reference signal CSI-RS of the candidate cell.

22. The method according to any one of claims 17 to 20, It is characterized in that The first TCI set is a union of the second TCI sets of each candidate cell, and the second TCI set is the TCI set of the candidate cell itself; or, The first TCI set includes at least one TCI identifier, and one TCI identifier corresponds to one TCI state in the second TCI set.

23. The method according to any one of claims 15 to 22, It is characterized in that The way in which the terminal device switches to the target cell is based on switching without random access.

24. A beam indication method, It is characterized in that Executed by the second network device, the method includes: Send fourth information to the terminal device, where the fourth information is used to determine that the terminal device has successfully switched to the target cell, and the second network device is the network device corresponding to the target cell.

25. The method according to claim 24, It is characterized in that The fourth information is the first scheduling new transmission of the terminal device on the target cell; or, The fourth information is preset information, and the preset information is transmitted on a physical downlink shared channel PDSCH scheduled for the first time by the target cell.

26. The method according to claim 24 or 25, It is characterized in that The method further comprises: Send fifth information to the terminal device, the fifth information instructing the terminal device to deactivate a third TCI state, the third TCI state is all or part of the TCI state in the first TCI set, the first TCI set includes TCI states corresponding to candidate cells, and the candidate cells are cells configured by the first network device for beam measurement for the terminal device.

27. The method according to claim 26, It is characterized in that The TCI state includes a quasi-co-located QCL source, wherein the QCL source includes at least one of the following: Synchronization signal block SSB of the candidate cell; The channel state information reference signal CSI-RS of the candidate cell.

28. The method according to claim 26, It is characterized in that The first TCI set is a union of the second TCI sets of each candidate cell, and the second TCI set is the TCI set of the candidate cell itself; or, The first TCI set includes at least one TCI identifier, and one TCI identifier corresponds to one TCI state in the second TCI set.

29. The method according to any one of claims 25 to 28, It is characterized in that The method further comprises: Send sixth information to the terminal device, where the sixth information indicates a fifth TCI state, and the fifth TCI state is the TCI state of the target cell itself.

30. The method according to any one of claims 25 to 29, It is characterized in that The sixth information is used to instruct the terminal device to activate the fifth TCI state and deactivate the second TCI state.

31. A terminal device, It is characterized in that include: A transceiver module is configured to receive first information sent by a first network device, wherein the first information triggers the terminal device to perform a handover to a target cell, and the first network device is a network device corresponding to a current serving cell of the terminal device; The processing module is configured to determine a first transmission configuration indication TCI state based on the first information, the first TCI state indicating a first beam, and the first beam is a beam used by the terminal device when performing a switch to the target cell; determine a second TCI state, the second TCI state indicating a second beam, and the second beam is a beam used by the terminal device after switching to the target cell, and the second TCI state is the same as or different from the first TCI state.

32. A first network device, It is characterized in that include: The transceiver module is configured to send first information to the terminal device, wherein the first information triggers the terminal device to perform a switch to a target cell, and the first network device is a network device corresponding to a current serving cell of the terminal device.

33. A second network device, It is characterized in that include: The transceiver module is configured to send fourth information to the terminal device, where the fourth information is used to determine that the terminal device has successfully switched to the target cell, and the second network device is the network device corresponding to the target cell.

34. A communication device, It is characterized in that include: one or more processors; The communication device is used to execute the beam indication method described in any one of claims 1 to 14, claims 15 to 23, or claims 24 to 30.

35. A storage medium storing instructions, It is characterized in that When the instruction is executed on a communication device, the communication device is enabled to perform the beam indication method according to any one of claims 1 to 14, claims 15 to 23, or claims 24 to 30.

36. A communication system, It is characterized in that The communication system includes a terminal device, a second network device and a second network device, wherein the terminal device is configured to implement the beam indication method described in any one of claims 1 to 14, the first network device is configured to implement the beam indication method described in any one of claims 15 to 23, and the second network device is configured to implement the beam indication method described in any one of claims 24 to 30.

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