Communication method, terminal, network device and storage medium

Abstract

The invention relates to a communication method, a terminal, network equipment and a storage medium. The communication method comprises the following steps: sending first information to a candidate cell, wherein the first information is used for acquiring a timing advance (TA) corresponding to the candidate cell; and determining a first beam indicated by the first transmission configuration indication TCI state, wherein the first beam is used for receiving the TA corresponding to the candidate cell sent by the serving cell. According to the invention, the wave beam for receiving the TA sent by the service cell is determined for the terminal, so that the terminal can accurately receive the TA. Therefore, rapid switching can be carried out based on the TA of the candidate cell in the subsequent cell switching process, the time delay of cell switching is reduced, and the cell switching efficiency is improved.

Description

Communication method, terminal, network device and storage medium Technical Field

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

[0002] In dynamic inter-cell mobility (L1 / L2 based inter-cell mobility, LTM for short), to reduce the time overhead of cell handover, it is considered to perform timing advance (TA) measurements of candidate cells in advance. That is, the serving cell triggers the terminal to initiate random access to the candidate cell to measure the TA, and the measured TA is indicated to the terminal through the serving cell.

[0003] Summary of the Invention

[0004] In the LTM scenario, since the information indicating the timing advance of the candidate cell is sent by the serving cell, rather than the candidate cell receiving the preamble sequence, how the terminal receives the information sent by the serving cell is still undecided.

[0005] The embodiments of the present disclosure provide a communication method, a terminal, a network device, and a storage medium.

[0006] According to the first aspect of an embodiment of the present disclosure, a communication method is proposed, which is applied to a terminal, and the method includes: sending first information to a candidate cell, the first information being used to obtain a timing advance TA corresponding to the candidate cell; determining a first beam indicated by a first transmission configuration indication TCI state, the first beam being used to receive a TA corresponding to the candidate cell sent by a serving cell.

[0007] According to the second aspect of an embodiment of the present disclosure, a communication method is proposed, which is applied to a service cell. The method includes: using a first transmission configuration to indicate a first beam indicated by a TCI state to send a timing advance TA corresponding to a candidate cell to a terminal, and the TA is determined by the candidate cell based on the first information sent by the terminal.

[0008] According to the third aspect of an embodiment of the present disclosure, a communication method is proposed, which includes: the terminal sends first information to a candidate cell, the first information is used to obtain a timing advance TA corresponding to the candidate cell; the candidate cell sends TA to the serving cell; the serving cell uses a first beam indicated by a first transmission configuration indication TCI state to send TA to the terminal.

[0009] According to the fourth aspect of an embodiment of the present disclosure, a terminal is proposed, including: a transceiver module and a processing module; the transceiver module is used to send first information to a candidate cell, and the first information is used to obtain a timing advance TA corresponding to the candidate cell; the processing module is used to determine a first beam indicated by a first transmission configuration indication TCI state, and the first beam is used to receive a TA corresponding to the candidate cell sent by a serving cell.

[0010] According to the fifth aspect of an embodiment of the present disclosure, a network device is proposed, including: a transceiver module; the transceiver module is used to send a timing advance TA corresponding to a candidate cell to a terminal using a first beam indicated by a first transmission configuration indication TCI state, and the TA is determined by the candidate cell based on the first information sent by the terminal.

[0011] According to a sixth aspect of an embodiment of the present disclosure, a terminal is proposed, comprising: one or more processors; wherein the device is configured to execute the first aspect and any one of the communication methods in the first aspect.

[0012] According to a seventh aspect of an embodiment of the present disclosure, a network device is proposed, comprising: one or more processors; wherein the device is used to execute the second aspect and any one of the communication methods in the second aspect.

[0013] According to the eighth aspect of an embodiment of the present disclosure, a communication system is proposed, comprising a terminal and a network device, wherein the terminal is configured to implement the first aspect and any one of the communication methods in the first aspect, and the network device is configured to implement the second aspect and any one of the communication methods in the second aspect.

[0014] According to the ninth aspect of the 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 communication method of the first aspect and any one of the first aspects or the second aspect and any one of the second aspects.

[0015] The present disclosure allows a terminal to determine the beam of the TA sent by the serving cell so that the terminal can accurately receive the TA, thereby enabling rapid switching based on the TA of the candidate cell during subsequent cell switching, reducing the delay of cell switching and improving cell switching efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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.

[0017] FIG1a is a schematic diagram showing a communication system architecture according to an embodiment of the present disclosure.

[0018] Fig. 1b is a schematic diagram showing a terminal movement scenario according to an exemplary embodiment.

[0019] FIG1c is a schematic diagram showing a cell handover signaling interaction according to an exemplary embodiment.

[0020] FIG2 is a schematic diagram showing an interaction of a communication method according to an embodiment of the present disclosure.

[0021] Fig. 3 is a flow chart showing a communication method according to an exemplary embodiment.

[0022] Fig. 4 is a flow chart showing another communication method according to an exemplary embodiment.

[0023] Fig. 5 is a flow chart showing yet another communication method according to an exemplary embodiment.

[0024] FIG6 is a timing diagram according to an exemplary embodiment.

[0025] Fig. 7a is a schematic diagram showing a communication device according to an exemplary embodiment.

[0026] Fig. 7b is a schematic diagram of another communication device according to an exemplary embodiment.

[0027] Fig. 8a is a schematic diagram showing a communication device according to an exemplary embodiment.

[0028] FIG8 b is a schematic diagram of a chip according to an exemplary embodiment. DETAILED DESCRIPTION

[0029] The embodiments of the present disclosure provide a communication method, a terminal, a network device, and a storage medium.

[0030] In the first aspect, an embodiment of the present disclosure proposes a communication method, which is applied to a terminal, and the method includes: sending first information to a candidate cell, the first information being used to obtain a timing advance TA corresponding to the candidate cell; determining a first beam indicated by a first transmission configuration indication TCI state, the first beam being used to receive a TA corresponding to the candidate cell sent by a serving cell.

[0031] In the above embodiment, the present disclosure allows the terminal to determine the beam of the TA sent by the serving cell, so that the terminal can accurately receive the second information. This allows the terminal to quickly switch to the candidate cell TA in the subsequent cell switching process based on the second information, thereby reducing the cell switching delay and improving the cell switching efficiency.

[0032] In combination with some embodiments of the first aspect, the first TCI state is at least one of the following: the TCI state adopted for receiving the second information, wherein the second information is used to trigger the terminal to send the first information to the candidate cell; the serving cell is the TCI state indicated by the terminal; the serving cell is the TCI state indicated by the type 1 physical downlink control channel PDCCH.

[0033] In the above embodiment, multiple possible situations for receiving the TA beam are provided to adapt to different scenarios and adopt the appropriate TA beam for receiving the TA. This facilitates rapid switching based on the candidate cell's TA during subsequent cell switching, reduces cell switching latency, and improves cell switching efficiency.

[0034] In combination with some embodiments of the first aspect, the first TCI state includes: the TCI state indicated by the serving cell for the terminal, and the TCI state indicated by the serving cell for the type1 PDCCH; wherein, the TCI state configured by the serving cell for the type1 PDCCH is used to receive the type1PDCCH, and the TCI state indicated by the serving cell for the terminal is used to receive the PDSCH scheduled by the type1 PDCCH.

[0035] In the above embodiment, the beam for receiving the TA may include multiple different beams. This allows the terminal to use the appropriate beam to receive the PDCCH and the PDSCH scheduled by the PDCCH, and thus receive the TA in the PDSCH. This facilitates rapid switching based on the TA of the candidate cell during subsequent cell switching, reducing cell switching latency and improving cell switching efficiency.

[0036] In combination with some embodiments of the first aspect, the method further includes: the terminal fails to receive the TA using the first beam, and retransmits the first information to the candidate cell.

[0037] In the above embodiment, the first information can also be retransmitted, ensuring that the terminal can accurately receive the TA of the candidate cell. This allows for rapid switching based on the TA of the candidate cell during subsequent cell switching, reducing the delay of cell switching and improving cell switching efficiency.

[0038] In combination with some embodiments of the first aspect, a second beam indicated by a second TCI state is used to receive a TA sent by a serving cell.

[0039] In the above embodiment, the second beam can be used to receive the TA, ensuring that the terminal can accurately receive the TA of the candidate cell. This allows for rapid switching based on the TA of the candidate cell during subsequent cell switching, reducing cell switching latency and improving cell switching efficiency.

[0040] In combination with some embodiments of the first aspect, the second TCI state is at least one of the following: the TCI state adopted for receiving the second information, wherein the second information is used to trigger the terminal to send the first information to the candidate cell; the serving cell is the TCI state indicated by the terminal; the serving cell is the TCI state indicated by the type 1 physical downlink control channel PDCCH.

[0041] In the above embodiment, multiple possible situations for receiving the TA beam are provided to adapt to different scenarios and adopt the appropriate TA beam for receiving the TA. This facilitates rapid switching based on the candidate cell's TA during subsequent cell switching, reduces cell switching latency, and improves cell switching efficiency.

[0042] In combination with some embodiments of the first aspect, the second TCI state includes: the TCI state indicated by the serving cell for the terminal, and the TCI state indicated by the serving cell for the type1 PDCCH; wherein, the TCI state configured by the serving cell for the type1 PDCCH is used to receive the type1PDCCH, and the TCI state indicated by the serving cell for the terminal is used to receive the PDSCH scheduled by the type1 PDCCH.

[0043] In the above embodiment, the beam for receiving the TA may include multiple different beams. This allows the terminal to use the appropriate beam to receive the PDCCH and the PDSCH scheduled by the PDCCH, and thus receive the TA in the PDSCH. This facilitates rapid switching based on the TA of the candidate cell during subsequent cell switching, reducing cell switching latency and improving cell switching efficiency.

[0044] In combination with some embodiments of the first aspect, retransmitting the first information to the candidate cell includes: retransmitting the first information to the candidate cell using a third beam indicated by third information, wherein the third information is used to trigger the terminal to send the first information to the candidate cell.

[0045] In the above embodiment, a beam is provided for retransmitting the first information. The first information is retransmitted via this beam so that the TA can be accurately received. During subsequent cell switching, rapid switching can be performed based on the TA of the candidate cell, reducing cell switching latency and improving cell switching efficiency.

[0046] In combination with some embodiments of the first aspect, retransmitting the first information to the candidate cell includes: using a fourth beam to retransmit the first information to the candidate cell, wherein the fourth beam is a beam determined by the terminal based on the implementation of the terminal to retransmit the first information.

[0047] In the above embodiment, a beam is provided for retransmitting the first information. The first information is retransmitted via this beam so that the TA can be accurately received. During subsequent cell switching, rapid switching can be performed based on the TA of the candidate cell, reducing cell switching latency and improving cell switching efficiency.

[0048] In combination with some embodiments of the first aspect, the method further includes: sending fourth information to the serving cell, wherein the fourth information is used to indicate a first random access transmission resource RO used for retransmitting the first information.

[0049] In the above embodiment, the terminal may also synchronize the first RO corresponding to the retransmitted first information with the serving cell so that the serving cell and the terminal can align the window for sending the TA, so that the terminal can accurately receive the TA.

[0050] In combination with some embodiments of the first aspect, the second beam indicated by the second TCI state is used to receive the TA sent by the service cell, including: using the second beam to receive the TA sent by the service cell within a first time window, wherein the first time window is determined based on the RO indicated by the third information, and wherein the third information is used to trigger the terminal to send the first information to the candidate cell.

[0051] In the above embodiment, the terminal and the network device may determine a window for sending the TA based on the RO when the first information is initially transmitted, so that the terminal may accurately receive the TA based on the window.

[0052] In combination with some embodiments of the first aspect, the first TCI state includes at least one of the following: a downlink TCI state; a joint TCI state, wherein the joint TCI state is used to simultaneously indicate the beam used for uplink communication and the beam used for downlink communication.

[0053] In the above embodiment, multiple possible TCI states are provided to adapt to different scenarios, using appropriate beams to transmit the first information and receive the TA. This facilitates rapid switching based on the candidate cell's TA during subsequent cell switching, reduces cell switching latency, and improves cell switching efficiency.

[0054] In combination with some embodiments of the first aspect, the second TCI state includes at least one of the following: a downlink TCI state; a joint TCI state, wherein the joint TCI state is used to simultaneously indicate the beam used for uplink communication and the beam used for downlink communication.

[0055] In the above embodiment, multiple possible TCI states are provided to adapt to different scenarios, using appropriate beams to transmit the first information and receive the TA. This facilitates rapid switching based on the candidate cell's TA during subsequent cell switching, reduces cell switching latency, and improves cell switching efficiency.

[0056] According to the second aspect of an embodiment of the present disclosure, a communication method is provided, which is applied to a service cell. The method includes: using a first transmission configuration to indicate a first beam indicated by a TCI state to send a timing advance TA corresponding to a candidate cell to a terminal, where the TA is determined by the candidate cell based on the first information sent by the terminal.

[0057] In the above embodiment, the present disclosure allows the terminal to determine the beam of the TA sent by the serving cell so that the terminal can accurately receive the TA. This allows for rapid switching based on the TA of the candidate cell during subsequent cell switching, reducing the delay of cell switching and improving cell switching efficiency.

[0058] In combination with some embodiments of the second aspect, the first TCI state is at least one of the following: the TCI state used to send the second information, wherein the second information is used to trigger the terminal to send the first information to the candidate cell; the serving cell is the TCI state indicated by the terminal; the serving cell is the TCI state indicated by the type 1 physical downlink control channel PDCCH.

[0059] In combination with some embodiments of the second aspect, the first TCI state includes: the TCI state indicated by the serving cell for the terminal, and the TCI state indicated by the serving cell for the type1 PDCCH; wherein, the TCI state configured by the serving cell for the type1 PDCCH is used to send the type1PDCCH, and the TCI state indicated by the serving cell for the terminal is used to send the PDSCH scheduled by the type1 PDCCH.

[0060] In combination with some embodiments of the second aspect, the method also includes: the terminal does not receive the TA using the first beam, and sends the TA using the second beam indicated by the second TCI state, wherein the first information used to determine the TA is retransmitted by the terminal to the candidate cell.

[0061] In combination with some embodiments of the second aspect, the second TCI state is at least one of the following: the TCI state used to send the second information, wherein the second information is used to trigger the terminal to send the first information to the candidate cell; the serving cell is the TCI state indicated by the terminal; the serving cell is the TCI state indicated by the type 1 physical downlink control channel PDCCH.

[0062] In combination with some embodiments of the second aspect, the second TCI state includes: the TCI state indicated by the serving cell for the terminal, and the TCI state indicated by the serving cell for the type1 PDCCH; wherein, the TCI state configured by the serving cell for the type1 PDCCH is used to send the type1PDCCH, and the TCI state indicated by the serving cell for the terminal is used to send the PDSCH scheduled by the type1 PDCCH.

[0063] In combination with some embodiments of the second aspect, the first information is retransmitted by the terminal to the candidate cell using a third beam indicated by third information, wherein the third information is used to trigger the terminal to send the first information to the candidate cell.

[0064] In combination with some embodiments of the second aspect, the first information is retransmitted by the terminal to the candidate cell using a fourth beam, wherein the fourth beam is a beam determined by the terminal based on the implementation of the terminal to be used for retransmitting the first information.

[0065] In combination with some embodiments of the second aspect, the method further includes: receiving fourth information, where the fourth information is used to indicate a first random access transmission resource RO used for retransmitting the first information.

[0066] In combination with some embodiments of the second aspect, the second beam indicated by the second TCI state is used to send TA, including: using the second beam to send TA within a first time window, wherein the first time window is determined based on the RO indicated by the third information, and wherein the third information is used to trigger the terminal to send the first information to the candidate cell.

[0067] In combination with some embodiments of the second aspect, the first TCI state includes at least one of the following: a downlink TCI state; a joint TCI state, wherein the joint TCI state is used to simultaneously indicate the beam used for uplink communication and the beam used for downlink communication.

[0068] In combination with some embodiments of the second aspect, the second TCI state includes at least one of the following: a downlink TCI state; a joint TCI state, wherein the joint TCI state is used to simultaneously indicate the beam used for uplink communication and the beam used for downlink communication.

[0069] According to a third aspect of an embodiment of the present disclosure, a communication method is provided, comprising: a terminal sends first information to a candidate cell, the first information being used to obtain a timing advance TA corresponding to the candidate cell; the candidate cell sends TA to a serving cell; and the serving cell uses a first beam indicated by a first transmission configuration indication TCI state to send TA to the terminal.

[0070] In the above embodiment, the present disclosure allows the terminal to determine the beam of the TA sent by the serving cell so that the terminal can accurately receive the TA. This allows for rapid switching based on the TA of the candidate cell during subsequent cell switching, reducing the delay of cell switching and improving cell switching efficiency.

[0071] According to the fourth aspect of an embodiment of the present disclosure, a terminal is provided, including: a transceiver module and a processing module; the transceiver module is used to send first information to a candidate cell, and the first information is used to obtain a timing advance TA corresponding to the candidate cell; the processing module is used to determine a first beam indicated by a first transmission configuration indication TCI state, and the first beam is used to receive a TA corresponding to the candidate cell sent by a serving cell.

[0072] In the above embodiment, the present disclosure allows the terminal to determine the beam of the TA sent by the serving cell so that the terminal can accurately receive the TA. This allows for rapid switching based on the TA of the candidate cell during subsequent cell switching, reducing the delay of cell switching and improving cell switching efficiency.

[0073] According to the fifth aspect of an embodiment of the present disclosure, a network device is provided, including: a transceiver module; the transceiver module is used to send a timing advance TA corresponding to a candidate cell to a terminal using a first beam indicated by a first transmission configuration indication TCI state, and the TA is determined by the candidate cell according to the first information sent by the terminal.

[0074] In the above embodiment, the present disclosure allows the terminal to determine the beam of the TA sent by the serving cell so that the terminal can accurately receive the TA. This allows for rapid switching based on the TA of the candidate cell during subsequent cell switching, reducing the delay of cell switching and improving cell switching efficiency.

[0075] According to a sixth aspect of an embodiment of the present disclosure, a terminal is provided, comprising: one or more processors; wherein the device is configured to execute the first aspect and any one of the communication methods in the first aspect.

[0076] In the above embodiment, the present disclosure allows the terminal to determine the beam of the TA sent by the serving cell so that the terminal can accurately receive the TA. This allows for rapid switching based on the TA of the candidate cell during subsequent cell switching, reducing the delay of cell switching and improving cell switching efficiency.

[0077] According to a seventh aspect of an embodiment of the present disclosure, a network device is provided, comprising: one or more processors; wherein the device is configured to execute the second aspect and any one of the communication methods in the second aspect.

[0078] In the above embodiment, the present disclosure allows the terminal to determine the beam of the TA sent by the serving cell so that the terminal can accurately receive the TA. This allows for rapid switching based on the TA of the candidate cell during subsequent cell switching, reducing the delay of cell switching and improving cell switching efficiency.

[0079] According to the eighth aspect of an embodiment of the present disclosure, a communication system is provided, including a terminal and a network device, wherein the terminal is configured to implement the first aspect and any one of the communication methods in the first aspect, and the network device is configured to implement the second aspect and any one of the communication methods in the second aspect.

[0080] In the above embodiment, the present disclosure allows the terminal to determine the beam of the TA sent by the serving cell so that the terminal can accurately receive the TA. This allows for rapid switching based on the TA of the candidate cell during subsequent cell switching, reducing the delay of cell switching and improving cell switching efficiency.

[0081] According to the ninth aspect of an embodiment of the present disclosure, a storage medium is provided, which stores instructions. When the instructions are executed on a communication device, the communication device executes the communication method of the first aspect and any one of the first aspects or the second aspect and any one of the second aspects.

[0082] In the above embodiment, the present disclosure allows the terminal to determine the beam of the TA sent by the serving cell so that the terminal can accurately receive the TA. This allows for rapid switching based on the TA of the candidate cell during subsequent cell switching, reducing the delay of cell switching and improving cell switching efficiency.

[0083] According to a tenth aspect of the embodiments of the present disclosure, the embodiments of the present disclosure propose a program product. When the program product is executed by a communication device, the communication device executes the method described in the optional implementation manner of the first aspect or the second aspect.

[0084] According to an eleventh aspect of the embodiments of the present disclosure, the embodiments of the present disclosure propose 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 or the second aspect.

[0085] According to a twelfth aspect of the embodiments of the present disclosure, the embodiments of the present disclosure provide 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 or second aspect.

[0086] It is understandable that the terminal, access network device, first network element, other network elements, core network device, communication system, storage medium, program product, computer program, chip, or chip system involved in each embodiment of the present disclosure are all 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.

[0087] The present disclosure provides a communication method, a terminal, a network device, and a storage medium. In some embodiments, the terms "communication method," "information processing method," and "communication method" are interchangeable; the terms "communication device," "information processing device," and "communication device" are interchangeable; and the terms "information processing system," "communication system," and "communication system" are interchangeable.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] In the embodiments of the present disclosure, “plurality” refers to two or more.

[0093] In some embodiments, the terms "at least one," "one or more," "a plurality of," "multiple," etc. may be used interchangeably.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] In some embodiments, devices and equipment can be interpreted as physical or virtual, and their names are not limited to the names recorded in the embodiments. In some cases, they can also be understood as "equipment", "device", "circuit", "network element", "node", "function", "unit", "section", "system", "network", "chip", "chip system", "entity", "subject", etc.

[0101] In some embodiments, "network" can be interpreted as devices included in the network, such as access network equipment, core network equipment, etc.

[0102] In some embodiments, "access network device (AN device)" may also be referred to as "radio access network device (RAN device)", "base station (BS)", "radio base station", "fixed station", and in some embodiments may also be understood as "node", "access point", "transmission point (TP)", "reception point (RP)", "transmission and / or reception point (TRP)" "panel", "antenna panel", "antenna array", "cell", "macro cell", "small cell", "femto cell", "pico cell", "sector", "cell group", "serving cell", "carrier", "component carrier", "bandwidth part (BWP)", etc.

[0103] In some embodiments, "terminal" or "terminal device" may be referred to as "user equipment (UE)", "user terminal" "mobile station (MS)", "mobile terminal (MT)", subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, etc.

[0104] In some embodiments, obtaining data, information, etc. may comply with the laws and regulations of the country where the data is obtained.

[0105] In some embodiments, data, information, etc. may be obtained with the user's consent.

[0106] 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.

[0107] FIG1a is a schematic diagram showing a communication system architecture according to an embodiment of the present disclosure.

[0108] As shown in FIG. 1 a , a communication system 100 includes a terminal 101 and a network device 102 .

[0109] In some embodiments, the terminal 101 includes, for example, a mobile phone, a wearable device, an Internet of Things device, a car with communication function, a smart car, a tablet computer, a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical surgery, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, and at least one of a wireless terminal device in a smart home, but is not limited thereto.

[0110] In some embodiments, the network device 102 may include at least one of an access network device and a core network device.

[0111] In some embodiments, the access network device is, for example, a node or device that accesses a terminal to a 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.

[0112] 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.

[0113] 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. 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.

[0114] In some embodiments, a core network device may be a device including one or more network elements, or may be multiple devices or device groups, each including all or part of the one or more network elements. The network element may be virtual or physical. The core network may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), and a Next Generation Core (NGC).

[0115] 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.

[0116] 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 illustrative only. The communication system may include all or part of the entities shown in FIG1a, or may include other entities other than those shown in FIG1a. The number and form of the entities may be arbitrary, and the entities may be physical or virtual. The connection relationship between the entities is illustrative only. The entities may be connected or disconnected, and the connection may be in any manner, including direct or indirect, wired or wireless.

[0117] The embodiments of the present disclosure can be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 5G new radio (NR), future radio access (FRA), new radio access technology (RAT), new radio (NR), new radio access (NX), future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (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).

[0118] In an embodiment of the present disclosure, in the scenario of L1 / L2 based inter-cell mobility. Figure 1b shows the scenario. It can be seen from Figure 1b that the terminal moves between cells, for example, according to the direction of the arrow, the terminal moves from cell 1 to cell 3. It can be understood that in the corresponding cell, the terminal can communicate with the network device of the cell through the transmission and receiving point (TRP) of the cell. In the scenario shown in Figure 1b, the network device can maintain multiple candidate cells for the terminal. As the terminal moves, when cell switching is required, a cell can be selected from multiple candidate cells as the target cell, and the terminal can switch to the target cell.

[0119] In some embodiments, to reduce handover latency and complete handover as quickly as possible, unlike traditional cell handover, in this example, radio resource control (RRC) parameters for each candidate cell can be pre-configured to the terminal. The network device can determine whether to perform a cell handover based on the L1 measurement results performed by the terminal. When the network device determines that a cell handover is necessary, it can trigger the terminal to switch to the target cell through dynamic handover signaling.

[0120] Figure 1c is a schematic diagram of a cell handover signaling interaction according to an exemplary embodiment. Figure 1c shows a process of a terminal performing a cell handover, which may include the following steps:

[0121] Step S1101: pre-configure candidate cell parameters for the terminal.

[0122] In some embodiments, the network device may pre-configure parameters of one or more candidate cells for the terminal.

[0123] For example, the network equipment of the serving cell can pre-configure parameters of one or more candidate cells for the terminal based on radio resource management (RRM) measurement results. In some cases, the RRM measurement results can also be referred to as L3 measurement results. It is understood that since the serving cell has established a connection with the terminal and provides services to the terminal, the network equipment of the serving cell can pre-configure parameters of one or more candidate cells for the terminal. However, since the candidate cell has not established a connection with the terminal, it cannot provide services to the terminal and, therefore, cannot configure the corresponding parameters for the terminal.

[0124] For example, the RRC parameters of each candidate cell are sent to the terminal in advance and stored in the terminal.

[0125] In some embodiments, a terminal can use preconfigured candidate cell parameters, such as the beam measurement reference signal of each candidate cell, to perform beam measurement on at least one beam in the candidate cell, thereby obtaining a beam measurement result corresponding to the candidate cell. It will be appreciated that beam measurement is typically performed on multiple beams in a candidate cell. Furthermore, when candidate cell parameters for multiple candidate cells are preconfigured, beam measurement can be performed on multiple different candidate cells using the corresponding beam measurement reference signal of the candidate cell, thereby obtaining beam measurement results corresponding to each of the multiple candidate cells.

[0126] Step S1102: The terminal performs downlink synchronization.

[0127] In some embodiments, the terminal may maintain downlink synchronization with the candidate cell by receiving a synchronization signal / physical broadcast channel block (SSB) of the candidate cell.

[0128] Step S1103: The terminal reports an L1 measurement report to the network equipment of the serving cell.

[0129] In some embodiments, the terminal may report a beam measurement result obtained by the terminal to the network device of the serving cell. The beam measurement result may also be referred to as an L1 measurement result. It is understood that the serving cell may be the cell where the terminal was located before the cell handover.

[0130] In some embodiments, the terminal performs beam measurement on the candidate cell, for example, measuring L1-reference signal receiving power (RSRP), L1-signal interference noise ratio (SINR), etc.

[0131] Step S1104: The network equipment of the serving cell determines whether to perform cell handover based on the L1 measurement report.

[0132] In some embodiments, upon receiving an L1 measurement report sent by a terminal, the network device of the serving cell may determine whether the terminal needs to perform cell handover based on the L1 measurement report.

[0133] For example, the network equipment of the serving cell may determine that the terminal does not need to perform cell handover.

[0134] For another example, the network equipment of the serving cell may determine that the terminal needs to perform a cell handover. Of course, the network equipment of the serving cell may further determine which new cell the terminal should be handed over to. For example, the cell after the terminal performs a cell handover may be referred to as the target cell. That is, the target cell is the serving cell after the terminal performs a cell handover.

[0135] It can be understood that the target cell may be a candidate cell selected by the network equipment of the serving cell from one or more candidate cells as the target cell.

[0136] Step S1105: The network device of the serving cell sends a cell switching signaling to the terminal.

[0137] In some embodiments, when the network equipment of the serving cell determines that the terminal needs to perform cell handover, the network equipment of the serving cell may send cell handover signaling to the terminal. The cell handover signaling may be used to instruct the terminal to perform cell handover.

[0138] In some embodiments, the cell handover signaling may further indicate a target cell.

[0139] Step S1106: The terminal accesses the target cell.

[0140] In some embodiments, upon receiving the cell switching signaling, the terminal may perform random access to access the target cell, thereby completing the cell switching of the terminal.

[0141] It can be understood that in the process shown in FIG1c , the terminal needs to perform L1 measurement on each candidate cell and report the measurement results to the network equipment of the serving cell so that the network equipment of the serving cell can determine whether the terminal needs to perform cell handover based on the measurement results.

[0142] It can be understood that the above FIG. 1c only provides a possible LTM process diagram, and of course it may also include other steps or other possible execution orders, which are not limited in the present disclosure.

[0143] In some embodiments, in order to reduce the handover delay of the terminal during cell handover, it is considered to perform TA measurement of the candidate cell in advance. After the terminal receives the handover signaling, it no longer needs to perform random access to access the target cell, so that the handover can be completed as soon as possible. For example, when performing TA measurement, the terminal is triggered by the serving cell to initiate random access (RA) to the candidate cell to measure the TA of the terminal to each candidate cell. The candidate cell measures the TA based on the preamble sequence sent by the terminal, and the candidate cell feeds back the measured TA to the serving cell. The serving cell can send the TA measured by the candidate cell to the terminal through a random access response (RAR).

[0144] It is understood that in various embodiments of the present disclosure, the serving cell may also be referred to as a source cell, that is, a cell that is currently connected to the terminal and provides communication services to the terminal.

[0145] In some embodiments, during a conventional random access process, after a preamble sequence is sent to a cell, the RAR is also fed back to the terminal by the cell. Therefore, the receiving beam of the RAR can be the same as the transmitting beam of the preamble sequence.

[0146] In some embodiments, if a terminal fails to successfully receive the RAR, it can retransmit the preamble sequence, or perform a random access retransmission. The retransmission beam can then be changed. Specifically, the terminal can reselect an appropriate transmission beam and random access channel occasion (RO) based on measurements of the synchronization signal / physical broadcast channel block (SSB).

[0147] In some embodiments, in a LTM scenario, the random access procedure initiated to a candidate cell for TA measurement will be sent from the serving cell. In other words, the terminal needs to receive the RAR from the serving cell. Therefore, the traditional method of determining the RAR beam is no longer applicable.

[0148] In some embodiments, if RAR reception from the serving cell fails, whether beam reselection is permitted is unclear. If beam reselection is permitted, how to ensure that the terminal can successfully receive the RAR from the serving cell is also unclear.

[0149] FIG2 is a schematic diagram illustrating an interaction of a communication method according to an embodiment of the present disclosure. As shown in FIG2 , the present disclosure embodiment relates to a communication method for use in a communication system 100, the method comprising:

[0150] Step S2101: The terminal sends first information to a candidate cell.

[0151] In some embodiments, the terminal sends the first information to the candidate cell.

[0152] In some embodiments, the candidate cell receives the first information sent by the terminal.

[0153] In some embodiments, the names of information, etc. are not limited to the names described in the embodiments, and terms such as "information", "message", "signal", "signaling", "report", "configuration", "indication", "instruction", "command", "channel", "parameter", "domain", "field", "symbol", "symbol", "codeword", "codebook", "codeword", "codepoint", "bit", "data", "program", and "chip" can be used interchangeably.

[0154] In some embodiments, "obtain", "get", "get", "receive", "transmit", "bidirectional transmission", "send and / or receive" can be interchangeable, and can be interpreted as receiving from other entities, obtaining from protocols, obtaining from higher layers, obtaining by self-processing, autonomous implementation, etc.

[0155] In some embodiments, terms such as "send", "transmit", "report", "download", "transmit", "bidirectional transmission", "send and / or receive" can be used interchangeably.

[0156] It can be understood that the candidate cells mentioned in the various embodiments of the present disclosure can be considered to represent network devices corresponding to the candidate cells.

[0157] In some embodiments, the network device corresponding to the candidate cell may be the network device 102 mentioned above.

[0158] In some embodiments, the first information is used to obtain a TA corresponding to the candidate cell.

[0159] In some embodiments, the first information may be referred to as a random access message (MSG) 1 .

[0160] In some embodiments, the first information may be a preamble sequence.

[0161] In some embodiments, the first information may also be called message 1, TA acquisition information, random access information, etc. The present disclosure does not limit the name of the first information.

[0162] In some embodiments, the serving cell may send the second information to the terminal.

[0163] In some embodiments, the terminal may receive second information sent by the serving cell.

[0164] In some embodiments, the second information is used to trigger the terminal to send the first information to the candidate cell.

[0165] In some embodiments, the second information may be downlink control information (DCI).

[0166] For example, the second information may be carried on a physical downlink control channel (PDCCH). The second information may also be referred to as a PDCCH order.

[0167] It is understandable that the aforementioned PDCCH order can be sent based on the implementation of the serving cell. That is, the serving cell can send the PDCCH order at any time to trigger the terminal to send a preamble sequence to the candidate cell to obtain the TA of the candidate cell.

[0168] In some embodiments, the second information may also be called RACH activation information, RACH triggering information, TA acquisition information, etc. The present disclosure does not limit the name of the second information.

[0169] In some embodiments, after receiving the second information sent by the serving cell, the terminal determines to send the first information to the candidate cell to obtain the TA corresponding to the candidate cell.

[0170] In some embodiments, the terminal may use the beam indicated by the second information to send the first information to the candidate cell.

[0171] For example, the terminal uses the beam indicated by the PDCCH order to send the first information to the candidate cell.

[0172] In some embodiments, a beam may also be referred to as a transmission configuration indication (TCI) state, spatial relation information (spatialrelationinfo), or a spatial filter.

[0173] In some embodiments, the network device corresponding to the serving cell may be the network device 102 mentioned above.

[0174] In some embodiments, the sending of information by a terminal to a network device may be considered uplink communication.

[0175] In some embodiments, the terms "uplink", "uplink", "physical uplink", etc. can be used interchangeably.

[0176] Step S2102: The candidate cell sends fifth information to the serving cell.

[0177] In some embodiments, the candidate cell sends the fifth information to the serving cell.

[0178] In some embodiments, the serving cell receives the fifth information sent by the candidate cell.

[0179] In some embodiments, the fifth information is used to indicate a TA value measured by the candidate cell.

[0180] In some embodiments, after the candidate cell measures the TA based on the first information sent by the terminal 101, the candidate cell sends fifth information indicating the TA to the serving cell, so that the serving cell can indicate the TA value measured by the candidate cell to the terminal.

[0181] For example, after receiving the preamble sequence sent by terminal 101, the candidate cell measures and obtains the TA corresponding to the candidate cell. The candidate cell sends fifth information indicating the TA to the serving cell, so that the serving cell can indicate the TA value measured by the candidate cell to the terminal based on the fifth information.

[0182] Step S2103: The serving cell sends sixth information to the terminal.

[0183] In some embodiments, the serving cell sends the sixth information to the terminal.

[0184] In some embodiments, the terminal receives sixth information sent by the serving cell.

[0185] In some embodiments, the sending of information by a network device to a terminal may be considered as downlink communication.

[0186] In some embodiments, the terms "downlink", "physical downlink", etc. can be used interchangeably.

[0187] In some embodiments, the sixth information includes the TA corresponding to the candidate cell.

[0188] In some embodiments, the sixth information may be RAR.

[0189] In some embodiments, the sixth information may also be called TA indication information, TA feedback information, RAR message, etc. The present disclosure does not limit the name of the sixth information.

[0190] In some embodiments, the terminal determines a first beam indicated by a first TCI state, and the first beam is used to receive the sixth information sent by the serving cell.

[0191] In some embodiments, the first TCI state may be determined to be a TCI state used to receive the second information.

[0192] For example, the first TCI state is a TCI state used for receiving the PDCCH order.

[0193] In some embodiments, the first TCI state may be determined to be a joint TCI state or a downlink TCI state indicated by the serving cell to the terminal.

[0194] In some embodiments, the joint TCI state or downlink TCI state indicated by the serving cell to the terminal may have been configured for the terminal before the serving cell sends the PDCCH order to the terminal. Of course, in some examples, the serving cell may reconfigure a new TCI state for the terminal after sending the PDCCH order to the terminal. That is, the joint TCI state or downlink TCI state indicated by the serving cell to the terminal may also be configured after the serving cell sends the PDCCH order to the terminal.

[0195] In some embodiments, the first TCI state may be determined to be a TCI state indicated by a type 1 PDCCH of the serving cell.

[0196] In some embodiments, the first TCI state includes a joint TCI state or a downlink TCI state indicated by the serving cell for the terminal, and a TCI state indicated by the serving cell for a type 1 PDCCH. The TCI state indicated by the serving cell for a type 1 PDCCH is used for the terminal to receive a type 1 PDCCH; the joint TCI state or the downlink TCI state indicated by the serving cell for the terminal is used for the terminal to receive a physical downlink shared channel (PDSCH) scheduled by a type 1 PDCCH.

[0197] In some embodiments, the serving cell sends the RAR on the PDSCH scheduled by the type 1 PDCCH, and the terminal receives the RAR on the PDSCH scheduled by the type 1 PDCCH.

[0198] In some embodiments, the terms "PDSCH", "DL data", etc. can be used interchangeably.

[0199] In some embodiments, when the terminal retransmits the first information, the terminal uses the second beam indicated by the second TCI state, and the second beam is used to receive the sixth information sent by the serving cell.

[0200] It can be understood that the first beam is the beam used by the terminal to receive the sixth information when initially transmitting the first information, and the second beam is the beam used by the terminal to receive the sixth information when retransmitting the first information.

[0201] In some embodiments, the second TCI state may be determined to be a TCI state used to receive the second information.

[0202] For example, the second TCI state is a TCI state used for receiving the PDCCH order.

[0203] In some embodiments, the second TCI state may be determined to be a joint TCI state or a downlink TCI state indicated by the serving cell to the terminal.

[0204] In some embodiments, the second TCI state may be determined to be the TCI state indicated by the type 1 PDCCH of the serving cell.

[0205] In some embodiments, the second TCI state includes a TCI state indicated by the serving cell for the terminal and a TCI state indicated by the serving cell for type 1 PDCCH. The TCI state indicated by the serving cell for type 1 PDCCH is used for the terminal to receive type 1 PDCCH, and the TCI state indicated by the serving cell for the terminal is used for the terminal to receive PDSCH scheduled by type 1 PDCCH.

[0206] In some embodiments, when the terminal retransmits the first information, the terminal uses the beam indicated by the second TCI state within the first time window to receive the sixth information sent by the serving cell. The first time window may be determined based on the RO indicated by the third information.

[0207] For example, when a terminal retransmits the first information, it may or may not send the fourth information. In other words, the terminal may or may not notify the serving cell of the newly determined first RO. In this case, the RO indicated by the PDCCH order can be uniformly used to determine the RAR window. This ensures alignment of the RAR window positions between the terminal and the serving cell, preventing misalignment of the RAR windows of the terminal and the serving cell, which could result in the terminal not receiving the RAR sent by the serving cell.

[0208] In some embodiments, the terminal does not send the fourth information to the serving cell, and the RAR window is determined based on the RO indicated by the PDCCH order.

[0209] It can be understood that in each embodiment of the present disclosure, the terminal receives the sixth information sent by the serving cell, including receiving the type1 PDCCH within the RAR window and receiving the PDSCH scheduled by the type1 PDCCH. Among them, the sixth information is carried in the PDSCH. Of course, the PDSCH scheduled by the type1 PDCCH may be located within the RAR window or outside the RAR window, which is not limited in this disclosure. However, in each embodiment of the present disclosure, the description of receiving the sixth information within the RAR window can still be used, which can be understood as having the same meaning as the above-mentioned receiving the type1 PDCCH within the RAR window and receiving the PDSCH scheduled by the type1 PDCCH.

[0210] In some embodiments, the first TCI state may include one TCI state or two TCI states. The second TCI state may include one TCI state or two TCI states. If one TCI state is included, the beam indicated by the TCI state may be used to receive the type1 PDCCH in the RAR window, and then the beam indicated by the TCI state may be used to receive the PDSCH scheduled by the type1 PDCCH. If two TCI states are included, the beam indicated by one of the TCI states may be used to receive the type1 PDCCH in the RAR window, and then the beam indicated by the other TCI state may be used to receive the PDSCH scheduled by the type1 PDCCH. For example, the first TCI state of the two TCI states is used to receive the type1 PDCCH in the RAR window; and then the second TCI state of the two TCI states is used to receive the PDSCH scheduled by the type1 PDCCH.

[0211] In some embodiments, if the terminal does not receive the sixth information sent by the serving cell after sending the first information, the terminal may further retransmit the first information to the candidate cell.

[0212] In some embodiments, the terminal may retransmit the first information to the candidate cell.

[0213] In some embodiments, the candidate cell may receive the first information retransmitted by the terminal.

[0214] In some embodiments, if the terminal does not receive the RAR sent by the serving cell, the terminal may retransmit the first information to the candidate cell.

[0215] In some embodiments, the beam in which the terminal retransmits the first information is the same beam as the beam in which the first information was initially transmitted, i.e., a third beam. For example, the third beam can be determined by an SSB index indicated in the third information. The third information is used to trigger the terminal to transmit the first information to the candidate cell.

[0216] In some embodiments, the third information and the second information may be the same information, for example, a PDCCH order.

[0217] In some embodiments, the terminal may use a fourth beam to retransmit the first information to the candidate cell. The fourth beam may be selected by the terminal itself. For example, the terminal may make the selection based on its specific implementation. This selection may be based on factors such as the terminal's current device status, pre-set rules, and the terminal's battery level, which are not specifically limited in this disclosure.

[0218] For example, the terminal reselects a more appropriate beam, that is, the fourth beam, based on the beam measurement result, and retransmits the first information using the fourth beam.

[0219] In some embodiments, when the terminal reselects the beam used for retransmitting the first information, the terminal may send fourth information to the serving cell.

[0220] In some embodiments, the terminal may send the fourth information to the serving cell.

[0221] In some embodiments, the serving cell may receive the fourth information sent by the terminal.

[0222] In some embodiments, the fourth information is used to indicate a first RO used for retransmitting the first information.

[0223] It is understood that when retransmitting the first information, the terminal can reselect the beam for retransmitting the first information. In order for the candidate cell to successfully receive the preamble sequence, the terminal needs to send the preamble sequence on the RO corresponding to the reselected transmission beam, that is, the first RO. However, considering that the first RO is newly determined by the terminal and is unknown to the serving cell, the terminal sends fourth information to the serving cell to indicate the newly determined first RO.

[0224] In some examples, the terminal and the serving cell can determine the RAR window for sending and receiving RARs based on the location of the RO. Therefore, by synchronizing the first RO, the terminal and the serving cell can ensure that the RAR window is aligned. This avoids misalignment of the RAR windows of the terminal and the serving cell, resulting in the terminal not receiving the RAR sent by the serving cell.

[0225] It should be understood that the present disclosure does not limit the order in which the terminal transmits the fourth information and retransmits the first information. For example, the terminal may first transmit the fourth information to the serving cell and then retransmit the first information to the candidate cell. Alternatively, the terminal may first retransmit the first information to the candidate cell and then transmit the fourth information to the serving cell. Alternatively, the terminal may simultaneously transmit the fourth information to the serving cell and retransmit the first information to the candidate cell.

[0226] In some embodiments, the terminal may first send the fourth information to the serving cell, and then retransmit the first information to the candidate cell.

[0227] The perception communication method involved in the embodiment of the present disclosure may include at least one of steps S2101 to S2103. For example, steps S2101+S2102+S2103 may be implemented as an independent embodiment, but are not limited thereto.

[0228] In some embodiments, reference may be made to other optional implementations described before or after the description corresponding to FIG. 2 .

[0229] FIG3 is a flow chart of a communication method according to an exemplary embodiment. As shown in FIG3 , the present disclosure embodiment relates to a communication method that can be executed on a terminal. The method includes:

[0230] Step S3101, sending the first information.

[0231] The optional implementation of step S3101 can refer to the optional implementation of step S2101 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0232] Step S3102, obtain sixth information.

[0233] The optional implementation of step S3102 can refer to the optional implementation of step S2103 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0234] In some embodiments, step S3102 is omitted, and the terminal autonomously implements the function indicated by the second information, or the above function is default or by default.

[0235] In combination with some embodiments of the first aspect, the first TCI state is at least one of the following: the TCI state adopted for receiving the second information, wherein the second information is used to trigger the terminal to send the first information to the candidate cell; the serving cell is the TCI state indicated by the terminal; the serving cell is the TCI state indicated by the type 1 physical downlink control channel PDCCH.

[0236] In combination with some embodiments of the first aspect, the first TCI state includes: the TCI state indicated by the serving cell for the terminal, and the TCI state indicated by the serving cell for the type1 PDCCH; wherein, the TCI state configured by the serving cell for the type1 PDCCH is used to receive the type1PDCCH, and the TCI state indicated by the serving cell for the terminal is used to receive the PDSCH scheduled by the type1 PDCCH.

[0237] In combination with some embodiments of the first aspect, the method further includes: the terminal fails to receive the TA using the first beam, and retransmits the first information to the candidate cell.

[0238] In combination with some embodiments of the first aspect, a second beam indicated by a second TCI state is used to receive a TA sent by a serving cell.

[0239] In combination with some embodiments of the first aspect, the second TCI state is at least one of the following: the TCI state adopted for receiving the second information, wherein the second information is used to trigger the terminal to send the first information to the candidate cell; the serving cell is the TCI state indicated by the terminal; the serving cell is the TCI state indicated by the type 1 physical downlink control channel PDCCH.

[0240] In combination with some embodiments of the first aspect, the second TCI state includes: the TCI state indicated by the serving cell for the terminal, and the TCI state indicated by the serving cell for the type1 PDCCH; wherein, the TCI state configured by the serving cell for the type1 PDCCH is used to receive the type1PDCCH, and the TCI state indicated by the serving cell for the terminal is used to receive the PDSCH scheduled by the type1 PDCCH.

[0241] In combination with some embodiments of the first aspect, retransmitting the first information to the candidate cell includes: retransmitting the first information to the candidate cell using a third beam indicated by third information, wherein the third information is used to trigger the terminal to send the first information to the candidate cell.

[0242] In combination with some embodiments of the first aspect, retransmitting the first information to the candidate cell includes: using a fourth beam to retransmit the first information to the candidate cell, wherein the fourth beam is a beam determined by the terminal based on the implementation of the terminal to retransmit the first information.

[0243] In combination with some embodiments of the first aspect, the method further includes: sending fourth information to the serving cell, wherein the fourth information is used to indicate a first random access transmission resource RO used for retransmitting the first information.

[0244] In combination with some embodiments of the first aspect, the second beam indicated by the second TCI state is used to receive the TA sent by the service cell, including: using the second beam to receive the TA sent by the service cell within a first time window, wherein the first time window is determined based on the RO indicated by the third information, and wherein the third information is used to trigger the terminal to send the first information to the candidate cell.

[0245] In combination with some embodiments of the first aspect, the first TCI state includes at least one of the following: a downlink TCI state; a joint TCI state, wherein the joint TCI state is used to simultaneously indicate the beam used for uplink communication and the beam used for downlink communication.

[0246] In combination with some embodiments of the first aspect, the second TCI state includes at least one of the following: a downlink TCI state; a joint TCI state, wherein the joint TCI state is used to simultaneously indicate the beam used for uplink communication and the beam used for downlink communication.

[0247] FIG4 is a flow chart of another communication method according to an exemplary embodiment. As shown in FIG4, the embodiment of the present disclosure relates to a communication method that can be executed on a serving cell. The method includes:

[0248] Step S4101, sending the sixth information.

[0249] The optional implementation of step S4101 can refer to the optional implementation of step S2103 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0250] In combination with some embodiments of the second aspect, the first TCI state is at least one of the following: the TCI state used to send the second information, wherein the second information is used to trigger the terminal to send the first information to the candidate cell; the serving cell is the TCI state indicated by the terminal; the serving cell is the TCI state indicated by the type 1 physical downlink control channel PDCCH.

[0251] In combination with some embodiments of the second aspect, the first TCI state includes: the TCI state indicated by the serving cell for the terminal, and the TCI state indicated by the serving cell for the type1 PDCCH; wherein, the TCI state configured by the serving cell for the type1 PDCCH is used to send the type1PDCCH, and the TCI state indicated by the serving cell for the terminal is used to send the PDSCH scheduled by the type1 PDCCH.

[0252] In combination with some embodiments of the second aspect, the method also includes: the terminal does not receive the TA using the first beam, and sends the TA using the second beam indicated by the second TCI state, wherein the first information used to determine the TA is retransmitted by the terminal to the candidate cell.

[0253] In combination with some embodiments of the second aspect, the second TCI state is at least one of the following: the TCI state used to send the second information, wherein the second information is used to trigger the terminal to send the first information to the candidate cell; the serving cell is the TCI state indicated by the terminal; the serving cell is the TCI state indicated by the type 1 physical downlink control channel PDCCH.

[0254] In combination with some embodiments of the second aspect, the second TCI state includes: the TCI state indicated by the serving cell for the terminal, and the TCI state indicated by the serving cell for the type1 PDCCH; wherein, the TCI state configured by the serving cell for the type1 PDCCH is used to send the type1PDCCH, and the TCI state indicated by the serving cell for the terminal is used to send the PDSCH scheduled by the type1 PDCCH.

[0255] In combination with some embodiments of the second aspect, the first information is retransmitted by the terminal to the candidate cell using a third beam indicated by third information, wherein the third information is used to trigger the terminal to send the first information to the candidate cell.

[0256] In combination with some embodiments of the second aspect, the first information is retransmitted by the terminal to the candidate cell using a fourth beam, wherein the fourth beam is a beam determined by the terminal based on the implementation of the terminal to be used for retransmitting the first information.

[0257] In combination with some embodiments of the second aspect, the method further includes: receiving fourth information, where the fourth information is used to indicate a first random access transmission resource RO used for retransmitting the first information.

[0258] In combination with some embodiments of the second aspect, the second beam indicated by the second TCI state is used to send TA, including: using the second beam to send TA within a first time window, wherein the first time window is determined based on the RO indicated by the third information, and wherein the third information is used to trigger the terminal to send the first information to the candidate cell.

[0259] In combination with some embodiments of the second aspect, the first TCI state includes at least one of the following: a downlink TCI state; a joint TCI state, wherein the joint TCI state is used to simultaneously indicate the beam used for uplink communication and the beam used for downlink communication.

[0260] In combination with some embodiments of the second aspect, the second TCI state includes at least one of the following: a downlink TCI state; a joint TCI state, wherein the joint TCI state is used to simultaneously indicate the beam used for uplink communication and the beam used for downlink communication.

[0261] FIG5 is a flow chart of another communication method according to an exemplary embodiment. As shown in FIG5 , the embodiment of the present disclosure relates to a communication method, and the method includes:

[0262] Step S5101: The terminal sends first information to a candidate cell.

[0263] The optional implementation of step S5101 can refer to the optional implementation of step S2101 in Figure 2, the optional implementation of step S3101 in Figure 3, and other related parts in the embodiment involved in Figure 2 and other related parts in the embodiment involved in Figure 3, which will not be repeated here.

[0264] Step S5102: The serving cell sends sixth information to the terminal.

[0265] The optional implementation method of step S5102 can refer to the optional implementation method of step S2103 in Figure 2, the optional implementation method of step S3102 in Figure 3, the optional implementation method of step S4101 in Figure 4, and other related parts in the embodiment involved in Figure 2, other related parts in the embodiment involved in Figure 3, and other related parts in the embodiment involved in Figure 4, which will not be repeated here.

[0266] Next, the present disclosure will describe the above solution with more detailed embodiments.

[0267] In some embodiments, the RAR receive beam determination method includes at least one of the following.

[0268] In some embodiments, method 1: using a beam with the same order as the PDCCH that triggers the RACH.

[0269] For example, as shown in Figure 6, the PDCCH order received by the terminal in the first PDCCH can trigger RACH on the corresponding RO to obtain the TA of the candidate cell and receive the RAR sent by the serving cell through the type 1 PDCCH in the RAR window.

[0270] In some embodiments, method 2: the beam is determined by the joint TCI state / downlink TCI state indicated by the current serving cell to the terminal.

[0271] In some embodiments, method three: determining the receiving beam for receiving the RAR by specifically indicating the TCI state for the type 1 PDCCH.

[0272] In some embodiments, the beam of type 1 PDCCH is determined using this specific method, but the beam of PDSCH carrying RAR is determined using method 2.

[0273] In some embodiments, both the beam of the type 1 PDCCH and the beam of the PDSCH transmitting the RAR are determined in this manner.

[0274] In some embodiments, when the RACH is initially transmitted, any one of the above three methods may be used. When the RACH is retransmitted, any one of the above methods may be used, which may be the same or different.

[0275] For example, if the RACH is an initial transmission, the receiving beam of the RAR is determined using method one; if the RACH is a retransmission, its transmitting beam can be determined using method two or method three.

[0276] In some embodiments, the method for determining the RAR retransmission beam includes at least one of the following.

[0277] In some embodiments, method 1: still using the beam indicated in the PDCCH order during initial transmission.

[0278] In some embodiments, method 2: the terminal reselects the beam for sending the preamble to the candidate cell.

[0279] In this case, because the terminal has reselected the beam and the corresponding RO resources, but the serving cell is unaware of this, during the RACH retransmission process, the serving cell does not know the location of the UE's new RAR window and needs to synchronize this information.

[0280] In some embodiments, the terminal reports a newly selected RO, ie, the first RO.

[0281] In some embodiments, the first RO and any SSB index have a unique correspondence. Specifically, the following parameters can only take values ​​of 1, 2, 4, 8, or 16. That is, one RO corresponds to 1 / 2 / 4 / 8 / 16, regardless of the SSB used.

[0282] ssb-perRACH-OccasionAndCB-PreamblesPerSSB CHOICE{

[0283] oneEighth ENUMERATED{n4, n8, n12, n16, n20, n24, n28, n32, n36, n40, n44, n48, n52, n56, n60, n64}

[0284] oneFourth ENUMERATED{n4,n8,n12,n16,n20,n24,n28,n32,n36,n40,n44,n48,n52,n56,n60,n64}

[0285] oneHalf ENUMERATED{n4, n8, n12, n16, n20, n24, n28, n32, n36, n40, n44, n48, n52, n56, n60, n64}

[0286] one ENUMERATED{n4, n8, n12, n16, n20, n24, n28, n32, n36, n40, n44, n48, n52, n56, n60, n64}

[0287] two ENUMERATED{n4, n8, n12, n16, n20, n24, n28, n32}

[0288] four INTEGER{1…16}

[0289] eight INTEGER{1…8}

[0290] sixteen INTEGER{1…4}

[0291] }

[0292] In some embodiments, after the terminal selects a new SSB index and RO, the RAR window is still determined according to the RO position during the initial transmission.

[0293] In the embodiments of the present disclosure, each step can be implemented as an independent embodiment. Part or all of the steps and their optional implementations can be arbitrarily combined with part or all of the steps in other embodiments, or with optional implementations of other embodiments.

[0294] The embodiments of the present disclosure also provide an apparatus for implementing any of the above methods. For example, a communication apparatus is provided, comprising units or modules for implementing each step performed by a terminal in any of the above methods. For another example, another communication 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.

[0295] 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), which realizes the functions of some or all of the above units or modules 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.

[0296] 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 the 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 and implementing 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 an ASIC, such as a neural network processing unit (NPU), a tensor processing unit (TPU), a deep learning processing unit (DPU), etc.

[0297] Figure 7a is a schematic diagram of a communication device according to an exemplary embodiment. As shown in Figure 7a, the communication device 7100 can be, for example, the terminal mentioned above, and the device 7100 includes: a transceiver module 7101 and a processing module 7102. In some embodiments, the transceiver module 7101 is used to send the first information. Optionally, the transceiver module 7101 is used to execute at least one of the communication steps S2101 and S2103 such as sending and / or receiving executed by the terminal in any of the above methods, but is not limited to this and will not be repeated here. Optionally, the processing module 7102 is used to execute the steps related to processing executed by the terminal in any of the above methods, but is not limited to this and will not be repeated here.

[0298] Figure 7b is a schematic diagram of another communication device according to an exemplary embodiment. As shown in Figure 7b, the communication device 7200 can be, for example, the network device mentioned above. The network device can be a network device corresponding to a serving cell, or a network device corresponding to a candidate cell. The device 7200 includes: a transceiver module 7201. Of course, the device 7200 can also include any possible modules such as a processing module, which is not limited in this disclosure. In some embodiments, the transceiver module 7201 is used to send the second information. Optionally, the transceiver module 7201 is used to perform at least one of the communication steps S2102 and S2103 such as sending and / or receiving performed by the network device in any of the above methods, but is not limited to this and will not be repeated here.

[0299] 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, etc.), a terminal (e.g., a user equipment, etc.), a chip, a chip system, or a processor that supports a network device to implement any of the above methods, or a chip, a chip system, or a processor that supports a terminal 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.

[0300] 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 communication protocols and communication data, and the central processing unit can be used to control the communication device (such as a base station, baseband chip, terminal device, terminal device chip, DU or CU, etc.), execute programs, and process program data. The communication device 8100 is used to perform any of the above methods.

[0301] In some embodiments, the communication device 8100 further includes one or more memories 8102 for storing instructions. Optionally, all or part of the memories 8102 may be located outside the communication device 8100.

[0302] In some embodiments, the communication device 8100 further includes one or more transceivers 8103. When the communication device 8100 includes one or more transceivers 8103, the transceiver 8103 performs at least one of the communication steps S2101, S2102, and S2103 of the above method for sending and / or receiving, but is not limited thereto. The processor 8101 performs other steps, but is not limited thereto.

[0303] 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, and transceiver circuit 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.

[0304] In some embodiments, the communication device 8100 may include one or more interface circuits 8104. Optionally, the interface circuit 8104 is connected to the memory 8102. The interface circuit 8104 may be configured to receive signals from the memory 8102 or other devices, and may be configured to send signals to the memory 8102 or other devices. For example, the interface circuit 8104 may read instructions stored in the memory 8102 and send the instructions to the processor 8101.

[0305] The communication device 8100 described in the above embodiment may be a network device or a terminal, but the scope of the communication device 8100 described in the present disclosure is not limited thereto, and the structure of the communication device 8100 may not be limited by FIG. 7a. 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.

[0306] 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, reference can be made to the schematic diagram of the structure of the chip 8200 shown in FIG8b, but the present disclosure is not limited thereto.

[0307] The chip 8200 includes one or more processors 8201 , and the chip 8200 is configured to execute any of the above methods.

[0308] In some embodiments, the chip 8200 further includes one or more interface circuits 8202. Optionally, the interface circuit 8202 is connected to the memory 8203. The interface circuit 8202 can be used to receive signals from the memory 8203 or other devices, and can be used to send signals to the memory 8203 or other devices. For example, the interface circuit 8202 can read instructions stored in the memory 8203 and send the instructions to the processor 8201.

[0309] In some embodiments, the interface circuit 8202 executes at least one of the steps S2101, S2102, and S2103 of the above method for sending and / or receiving communications, but is not limited thereto. The processor 8201 executes other steps, but is not limited thereto.

[0310] In some embodiments, terms such as interface circuit, interface, transceiver pin, and transceiver may be used interchangeably.

[0311] In some embodiments, the chip 8200 further includes one or more memories 8203 for storing instructions. Alternatively, all or part of the memories 8203 may be outside the chip 8200.

[0312] The present disclosure also proposes a storage medium having instructions stored thereon, which, when executed on the communication device 8100, causes the communication device 8100 to execute 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.

[0313] 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 is a computer program product.

[0314] The present disclosure also proposes a computer program, which, when executed on a computer, causes the computer to perform any one of the above methods.

[0315] The present disclosure proposes a transmission beam determination method for a random access process for candidate cell TA measurement in LTM, which enables the terminal to obtain the TA value of the candidate cell in advance, eliminating the need for uplink transmission during cell switching and reducing cell switching delay.

Claims

1. A communication method, characterized in that: Applied to a terminal, the method comprises: Sending first information to a candidate cell, where the first information is used to obtain a timing advance TA corresponding to the candidate cell; Determine the first beam indicated by the first transmission configuration indication TCI state, and the first beam is used to receive the TA corresponding to the candidate cell sent by the serving cell.

2. The method according to claim 1, characterized in that The first TCI state is at least one of the following: receiving a TCI state used by second information, wherein the second information is used to trigger the terminal to send the first information to the candidate cell; The serving cell is a TCI state indicated by the terminal; The serving cell is in the TCI state indicated by the type 1 physical downlink control channel PDCCH.

3. The method according to claim 1, characterized in that The first TCI state includes: a TCI state indicated by the serving cell for the terminal, and a TCI state indicated by the serving cell as a type1 PDCCH; The TCI state indicated by the type1 PDCCH of the serving cell is used to receive the type1 PDCCH, and the TCI state indicated by the serving cell of the terminal is used to receive the PDSCH scheduled by the type1 PDCCH.

4. The method according to any one of claims 1 to 3, characterized in that: The method further comprises: The terminal fails to receive the TA using the first beam and retransmits the first information to the candidate cell.

5. The method according to claim 4, characterized in that The method further comprises: The TA sent by the serving cell is received using a second beam indicated by a second TCI state.

6. The method according to claim 5, characterized in that The second TCI state is at least one of the following: receiving a TCI state used by second information, wherein the second information is used to trigger the terminal to send the first information to the candidate cell; The serving cell is a TCI state indicated by the terminal; The serving cell is in the TCI state indicated by the type 1 physical downlink control channel PDCCH.

7. The method according to claim 5, characterized in that The second TCI state includes: the TCI state indicated by the serving cell for the terminal, and the TCI state indicated by the serving cell as type1 PDCCH; The TCI state indicated by the type1 PDCCH of the serving cell is used to receive the type1 PDCCH, and the TCI state indicated by the serving cell of the terminal is used to receive the PDSCH scheduled by the type1 PDCCH.

8. The method according to any one of claims 4 to 7, characterized in that: The retransmitting the first information to the candidate cell includes: The first information is retransmitted to the candidate cell using a third beam indicated by third information, wherein the third information is used to trigger the terminal to send the first information to the candidate cell.

9. The method according to any one of claims 4 to 7, characterized in that: The retransmitting the first information to the candidate cell includes: The first information is retransmitted to the candidate cell using a fourth beam, wherein the fourth beam is a beam determined by the terminal based on an implementation of the terminal to be used for retransmitting the first information.

10. The method according to claim 9, characterized in that The method further comprises: Sending fourth information to the serving cell, wherein the fourth information is used to indicate a first random access transmission resource RO used for retransmitting the first information.

11. The method according to any one of claims 5 to 7, characterized in that: The receiving the TA sent by the serving cell using a second beam indicated by a second TCI state includes: The TA sent by the serving cell is received using the second beam within a first time window, wherein the first time window is determined based on the RO indicated by third information, wherein the third information is used to trigger the terminal to send the first information to the candidate cell.

12. The method according to any one of claims 1 to 11, characterized in that: The first TCI state includes at least one of the following: Downlink TCI status; A joint TCI state, wherein the joint TCI state is used to simultaneously indicate a beam used for uplink communication and a beam used for downlink communication.

13. A communication method, characterized in that: Applied to a serving cell, the method comprises: A first beam indicated by a first transmission configuration indicating a TCI state is used to send a timing advance TA corresponding to a candidate cell to the terminal, and the TA is determined by the candidate cell according to the first information sent by the terminal.

14. The method according to claim 13, characterized in that The first TCI state is at least one of the following: a TCI state used for sending second information, wherein the second information is used to trigger the terminal to send the first information to the candidate cell; The TCI state indicated by the serving cell for the terminal; The serving cell is in the TCI state indicated by the type 1 physical downlink control channel PDCCH.

15. The method according to claim 13, characterized in that The first TCI state includes: a TCI state indicated by the serving cell for the terminal, and a TCI state indicated by the serving cell as a type1 PDCCH; The TCI state indicated by the type1 PDCCH of the serving cell is used to receive the type1 PDCCH, and the TCI state indicated by the serving cell of the terminal is used to receive the PDSCH scheduled by the type1 PDCCH.

16. The method according to any one of claims 13 to 15, characterized in that: The method further comprises: The terminal does not receive the TA using the first beam, and sends the TA using the second beam indicated by the second TCI state, wherein the first information used to determine the TA is retransmitted by the terminal to the candidate cell.

17. The method according to claim 16, characterized in that The second TCI status is at least one of the following: a TCI state used for sending second information, wherein the second information is used to trigger the terminal to send the first information to the candidate cell; The TCI state indicated by the serving cell for the terminal; The serving cell is in the TCI state indicated by the type 1 physical downlink control channel PDCCH.

18. The method according to claim 16, characterized in that The second TCI state includes: a TCI state indicated by the serving cell for the terminal, and a TCI state indicated by the serving cell as a type1 PDCCH; The TCI state configured by the serving cell for the type1 PDCCH is used to send the type1 PDCCH, and the TCI state indicated by the serving cell for the terminal is used to send the PDSCH scheduled by the type1 PDCCH.

19. The method according to any one of claims 16 to 18, characterized in that: The first information is retransmitted by the terminal to the candidate cell using a third beam indicated by third information, wherein the third information is used to trigger the terminal to send the first information to the candidate cell.

20. The method according to any one of claims 16 to 18, characterized in that: The first information is retransmitted by the terminal to the candidate cell using a fourth beam, wherein the fourth beam is a beam determined by the terminal based on an implementation of the terminal to be used for retransmitting the first information.

21. The method according to claim 20, characterized in that The method further comprises: Fourth information is received, where the fourth information is used to indicate a first random access transmission resource RO used for retransmitting the first information.

22. The method according to any one of claims 16 to 18, characterized in that: The using a second beam indicated by a second TCI state to send the TA includes: The TA is sent using the second beam within a first time window, wherein the first time window is determined based on the RO indicated by third information, wherein the third information is used to trigger the terminal to send the first information to the candidate cell.

23. The method according to any one of claims 13 to 21, characterized in that: The first TCI state includes at least one of the following: Downlink TCI status; A joint TCI state, wherein the joint TCI state is used to simultaneously indicate a beam used for uplink communication and a beam used for downlink communication.

24. A communication method, characterized in that: The method comprises: The terminal sends first information to the candidate cell, where the first information is used to obtain a timing advance TA corresponding to the candidate cell; The candidate cell sends the TA to the serving cell; The serving cell sends the TA to the terminal using a first beam indicated by a first transmission configuration indicating a TCI state.

25. A terminal, characterized in that: include: Transceiver module and processing module; The transceiver module is used to send first information to the candidate cell, where the first information is used to obtain a timing advance TA corresponding to the candidate cell; The processing module is used to determine the first beam indicated by the first transmission configuration indication TCI state, and the first beam is used to receive the TA corresponding to the candidate cell sent by the serving cell.

26. A network device, characterized in that: include: Transceiver module; The transceiver module is used to send a timing advance TA corresponding to a candidate cell to a terminal using a first beam indicated by a first transmission configuration indicating a TCI state, where the TA is determined by the candidate cell according to the first information sent by the terminal.

27. A terminal, characterized in that: include: one or more processors; The terminal is used to execute the communication method according to any one of claims 1 to 12.

28. A network device, characterized in that: include: one or more processors; Wherein, the network device is used to execute the communication method described in any one of claims 13-22.

29. A communication system, characterized in that: It comprises a terminal and a network device, wherein the terminal is configured to implement the communication method according to any one of claims 1 to 12, and the network device is configured to implement the communication method according to any one of claims 13 to 22.

30. A storage medium storing instructions, characterized in that: When the instruction is executed on a communication device, the communication device is caused to execute the communication method according to any one of claims 1-12 or 13-22.

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