Random access method and device, equipment and storage medium

Abstract

The invention relates to a random access method and device, equipment and a storage medium. The random access method comprises: sending first information to a first network device, the first information being used by the first network device for timing advance (TA) measurement, the first network device being a network device of a candidate cell; and receiving second information sent by a second network device, the second information comprising the TA corresponding to the first network device, and the second network device being a network device of the serving cell. According to the method and the device, the TA of the candidate cell is sent to the terminal through the serving cell, so that the terminal can receive the TA corresponding to the candidate cell through the serving cell, the time delay of cell switching is further reduced, and the efficiency of cell switching is improved.

Description

Random access method, device, equipment and storage medium Technical Field

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

[0002] To reduce the latency of traditional handovers, the technology considers pre-configuring multiple candidate cells for a terminal. As the terminal moves, the network equipment determines whether a handover is necessary based on the beam measurement results of the serving cell and candidate cells reported by the terminal. When a cell handover is necessary, the serving cell triggers the terminal to switch to the target cell through cell handover signaling. The target cell is selected from multiple candidate cells.

[0003] Summary of the Invention

[0004] When a terminal performs cell handover, it often needs to obtain the timing advance (TA) corresponding to different cells in advance. However, if the cell where the TA is measured is not the serving cell connected to the terminal, the terminal will not receive the TA, which will cause problems such as long cell handover delay and interruption.

[0005] The embodiments of the present disclosure provide a random access method, apparatus, device, and storage medium.

[0006] According to a first aspect of an embodiment of the present disclosure, a random access method is proposed, which is executed by a terminal. The method includes: sending first information to a first network device, where the first information is used to determine a timing advance TA, where TA is a TA corresponding to the first network device, and the first network device is a network device of a candidate cell; and receiving second information sent by a second network device, where the second information is used to indicate the TA, and the second network device is a network device of a serving cell.

[0007] According to a second aspect of an embodiment of the present disclosure, a random access method is proposed, which is performed by a second network device. The method includes: sending second information, where the second information is used to indicate a timing advance TA, where TA is determined by the first network device based on the first information, where TA is the TA corresponding to the first network device, the second network device is a network device of a serving cell, and the first network device is a network device of a candidate cell.

[0008] According to a third aspect of an embodiment of the present disclosure, a random access method is proposed, comprising: a terminal sending first information to a first network device, the first information being used to determine a timing advance TA, where TA is a TA corresponding to the first network device, and the first network device is a network device of a candidate cell; a second network device sending second information to the terminal, where the second information is used to indicate the TA, and the second network device is a network device of a serving cell; and the terminal receiving the second information sent by the second network device.

[0009] According to a fourth aspect of an embodiment of the present disclosure, a terminal is proposed, including: a transceiver module; the transceiver module is used to send first information to a first network device, the first information is used to determine a timing advance TA, TA is a TA corresponding to the first network device, and the first network device is a network device of a candidate cell; the transceiver module is also used to receive second information sent by a second network device, the second information is used to indicate the TA, and the second network device is a network device of a serving cell.

[0010] According to a 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 second information, the second information is used to indicate a timing advance TA, TA is determined by a first network device based on the first information, TA is the TA corresponding to the first network device, the second network device is a network device of a serving cell, and the first network device is a network device of a candidate cell.

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

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

[0014] According to the ninth aspect of an embodiment of the present disclosure, a storage medium is proposed, which stores instructions. When the instructions are executed on a communication device, the communication device executes a random access method such as the first aspect and any one of the first aspect or the second aspect and any one of the second aspect.

[0015] The present disclosure sends the TA of the candidate cell to the terminal through the serving cell, so that the terminal can receive the TA corresponding to the candidate cell through the serving cell, thereby reducing the delay of cell switching and improving the efficiency of cell switching. 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] FIG1 b is a schematic diagram showing a terminal movement scenario according to an embodiment of the present disclosure.

[0019] FIG1c is a schematic diagram showing a cell handover signaling interaction according to an embodiment of the present disclosure.

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

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

[0022] Fig. 3b is a flow chart showing another random access method according to an exemplary embodiment.

[0023] Fig. 3c is a flow chart showing another random access method according to an exemplary embodiment.

[0024] Fig. 3d is a flow chart showing yet another random access method according to an exemplary embodiment.

[0025] Fig. 3e is a flow chart showing another random access method according to an exemplary embodiment.

[0026] Fig. 4a is a flow chart showing another random access method according to an exemplary embodiment.

[0027] Fig. 4b is a flow chart showing yet another random access method according to an exemplary embodiment.

[0028] Fig. 4c is a flow chart showing another random access method according to an exemplary embodiment.

[0029] Fig. 4d is a flow chart showing another random access method according to an exemplary embodiment.

[0030] Fig. 4e is a flow chart showing yet another random access method according to an exemplary embodiment.

[0031] Fig. 4f is a flow chart showing another random access method according to an exemplary embodiment.

[0032] Fig. 4g is a flow chart showing another random access method according to an exemplary embodiment.

[0033] Fig. 5 is a flow chart showing yet another random access method according to an exemplary embodiment.

[0034] Fig. 6a is a schematic diagram showing a first time window according to an exemplary embodiment.

[0035] Fig. 6b is a schematic diagram showing another first time window according to an exemplary embodiment.

[0036] Fig. 6c is a schematic diagram showing another first time window according to an exemplary embodiment.

[0037] Fig. 7a is a schematic diagram of a random access apparatus according to an exemplary embodiment.

[0038] Fig. 7b is a schematic diagram of another random access apparatus according to an exemplary embodiment.

[0039] Fig. 8a is a schematic diagram showing a communication device according to an exemplary embodiment.

[0040] FIG8 b is a schematic diagram of a chip according to an exemplary embodiment. DETAILED DESCRIPTION

[0041] The embodiments of the present disclosure provide a random access method, apparatus, device, and storage medium.

[0042] In a first aspect, an embodiment of the present disclosure proposes a random access method, which is executed by a terminal and includes: sending first information to a first network device, where the first information is used to determine a timing advance TA, where TA is a TA corresponding to the first network device, and the first network device is a network device of a candidate cell; and receiving second information sent by a second network device, where the second information is used to indicate TA, and the second network device is a network device of a serving cell.

[0043] In the above embodiment, the TA of the candidate cell is sent to the terminal through the serving cell, so that the terminal can receive the TA corresponding to the candidate cell through the serving cell. For example, in the scenario of cell handover, the delay of cell handover can be reduced and the efficiency of cell handover can be improved.

[0044] In combination with some embodiments of the first aspect, receiving the second information sent by the second network device includes: receiving the second information sent by the second network device within a first time window, wherein the first time window is determined based on a first time domain position and a first duration.

[0045] In the above embodiment, by determining the first time window for sending the second information and receiving the second information based on the first time window, the terminal can accurately receive the second information and obtain the TA corresponding to the candidate cell. For example, in a cell handover scenario, this can reduce the cell handover latency and improve the efficiency of the cell handover.

[0046] In combination with some embodiments of the first aspect, the first duration is determined by at least one of the following methods: based on a first predefined rule, wherein the first predefined rule predefines the first duration; based on a network device configuration; based on a second duration and a third duration, wherein the second duration is the duration configured by the network device, and the third duration is determined by the network device configuration or based on the first predefined rule.

[0047] In the above embodiment, a plurality of configuration modes of the duration corresponding to the first time window are provided, so as to be applicable to receiving the second information based on the first time window in a variety of scenarios, thereby improving universality.

[0048] In combination with some embodiments of the first aspect, the first duration is determined based on the second duration and the third duration; and the second information includes information for indicating a system frame number.

[0049] In the above embodiment, the system frame number can be used to accurately indicate which frame the received second information corresponds to, thereby effectively avoiding RAR conflicts between different frames.

[0050] In combination with some embodiments of the first aspect, it is characterized in that the first time domain position is determined by at least one of the following methods: based on a second predefined rule, wherein the second predefined rule predefines the first time domain position; based on the network device configuration; based on the second time domain position and a fourth duration, wherein the second time domain position is the end position of the random access transmission resource RO for sending the first information, and the fourth duration is used to indicate the time domain offset between the first time domain position and the second time domain position.

[0051] In the above embodiment, a plurality of configuration modes of the starting position corresponding to the first time window are provided, so as to be applicable to receiving the second information based on the first time window in a variety of scenarios, thereby improving universality.

[0052] In combination with some embodiments of the first aspect, the first time domain position is determined based on the second time domain position and the fourth duration; the first time domain position is the first orthogonal frequency division multiplexing OFDM symbol after the second time domain position has passed the fourth duration.

[0053] In the above embodiment, a relatively specific first time domain location is provided so that an accurate first time window can be determined based on the first time domain location and the second information can be received. This allows the terminal to accurately receive the second information and obtain the TA corresponding to the candidate cell. For example, in a cell handover scenario, this can reduce the cell handover latency and improve the efficiency of the cell handover.

[0054] In combination with some embodiments of the first aspect, the first time domain position is determined based on the second time domain position and the fourth duration; the first time domain position is the first OFDM symbol of the control resource set CORESET corresponding to the type 1 common search space set of the physical downlink control channel of the first network device or the second network device after the fourth duration has passed since the second time domain position.

[0055] In the above embodiment, a relatively specific first time domain location is provided so that an accurate first time window can be determined based on the first time domain location and the second information can be received. This allows the terminal to accurately receive the second information and obtain the TA corresponding to the candidate cell. For example, in a cell handover scenario, this can reduce the cell handover latency and improve the efficiency of the cell handover.

[0056] In combination with some embodiments of the first aspect, the method further includes: receiving third information sent by the second network device, where the third information is used to instruct to send the first information to the first network device.

[0057] In the above embodiment, the network device can trigger the terminal to obtain the TA of the candidate cell through signaling, thereby preventing the terminal from frequently performing random access to obtain the cell TA, thereby improving communication stability.

[0058] In combination with some embodiments of the first aspect, sending first information to the first network device includes: sending the first information to the first network device based on the target RO; wherein the target RO is determined by at least one of the following methods: determined based on the fourth information, the third information includes the fourth information, and the fourth information is used to indicate the target RO; determined based on the fourth information and the fifth information, the third information includes the fourth information and the fifth information, the fourth information is used to indicate multiple ROs, and the fifth information is used to indicate that one of the multiple ROs is the target RO; determined based on the fourth information and the third predefined rule, the third information includes the fourth information, the fourth information is used to indicate multiple ROs, and the third predefined rule predefines the selection of one of the multiple ROs as the target RO.

[0059] In the above embodiments, multiple methods for determining the target RO are provided to accurately determine the first time window in various RO scenarios. This allows accurate reception of the second information based on the first time window to obtain the TA corresponding to the candidate cell. For example, in a cell handover scenario, this can reduce the delay of the cell handover and improve the efficiency of the cell handover.

[0060] In combination with some embodiments of the first aspect, the target RO is determined based on the fourth information and the third predefined rule; the method further includes: sending sixth information, where the sixth information is used to indicate the selected RO to the second network device.

[0061] In the above embodiment, the terminal can report the RO selected by itself so that the RO determined by the second network device is the same as the RO selected by the terminal, thereby avoiding the terminal and the second network device having different first time window positions due to different ROs, thereby preventing the terminal from being unable to receive the second information.

[0062] In combination with some embodiments of the first aspect, the method further includes: sending seventh information, where the seventh information is used to indicate a downlink time difference between the first network device and the second network device.

[0063] In the above embodiment, the terminal may report the downlink time difference between different network devices to avoid the first time window position being different due to asynchrony between cells, thereby preventing the terminal from receiving the second information.

[0064] In combination with some embodiments of the first aspect, the second information is carried in at least one of the following ways: a defined media access control protocol data unit MAC PDU command; a newly added media access control element MAC CE for carrying the second information.

[0065] In the above embodiments, multiple carrying modes of the second information are provided to be applicable to receiving the second information in multiple scenarios, thereby improving universality.

[0066] In combination with some embodiments of the first aspect, the second information includes at least one of the following parameters: a TA of the candidate cell; a cell identifier of the candidate cell; a logical identifier of the candidate cell; and a timing advance group TAG identifier of the candidate cell.

[0067] In the above embodiment, multiple possible parameters included in the second information are provided, so as to accurately indicate the TA of the candidate cell. For example, in the scenario of cell handover, the random access efficiency can be improved.

[0068] In combination with some embodiments of the first aspect, the type 1 common search space set of the physical downlink control channel and its associated CORESET are resources of the first network device or resources of the second network device.

[0069] In the above embodiment, the second time window may be determined based on the type 1 common search space set of the physical downlink control channel corresponding to the serving cell or the candidate cell and its associated CORESET, and the second information may be received to improve universality.

[0070] In combination with some embodiments of the first aspect, receiving second information sent by a second network device within a first time window includes: receiving a physical downlink control channel PDCCH for scheduling physical downlink shared channel PDSCH resources within the first time window, wherein the PDSCH resources are used to send the second information.

[0071] In the above embodiment, accurate second information can be received based on the PDSCH scheduled by the PDCCH within the first time window. For example, in a cell handover scenario, the cell handover delay can be reduced and the efficiency of the cell handover can be improved.

[0072] According to a second aspect of an embodiment of the present disclosure, a random access method is provided, which is performed by a second network device. The method includes: sending second information, where the second information is used to indicate a timing advance TA, where TA is determined by a first network device based on the first information, where TA is a TA corresponding to the first network device, the second network device is a network device of a serving cell, and the first network device is a network device of a candidate cell.

[0073] In the above embodiment, the TA of the candidate cell is sent to the terminal through the serving cell, so that the terminal can receive the TA corresponding to the candidate cell through the serving cell. For example, in the scenario of cell handover, the delay of cell handover can be reduced and the efficiency of cell handover can be improved.

[0074] In combination with some embodiments of the second aspect, sending the second information includes: sending the second information within a first time window, wherein the first time window is determined based on a first time domain position and a first duration.

[0075] In combination with some embodiments of the second aspect, the first duration is determined by at least one of the following methods: based on a first predefined rule, wherein the first predefined rule predefines the first duration; based on a network device configuration; based on a second duration and a third duration, wherein the second duration is the duration configured by the network device, and the third duration is determined by the network device configuration or based on the first predefined rule.

[0076] In combination with some embodiments of the second aspect, the second information includes information used to indicate a system frame number.

[0077] In combination with some embodiments of the second aspect, the first time domain position is determined by at least one of the following methods: based on a second predefined rule, wherein the second predefined rule predefines the first time domain position; based on the network device configuration; based on the second time domain position and a fourth duration, wherein the second time domain position is the end position of the random access transmission resource RO for sending the first information, and the fourth duration is used to indicate the time domain offset between the first time domain position and the second time domain position.

[0078] In combination with some embodiments of the second aspect, the first time domain position is the first orthogonal frequency division multiplexing OFDM symbol after the second time domain position has passed through a fourth duration.

[0079] In combination with some embodiments of the second aspect, the first time domain position is the first OFDM symbol of the control resource set CORESET corresponding to the type 1 common search space set of the physical downlink control channel sent by the first network device or the second network device after the fourth duration.

[0080] In combination with some embodiments of the second aspect, the method further includes: sending third information, where the third information is used to instruct the terminal to send the first information to the first network device.

[0081] In combination with some embodiments of the second aspect, the third information is also used to instruct the terminal to send the first information to the first network device based on the target RO; wherein, the target RO is determined by at least one of the following methods: determined based on the fourth information, the third information includes the fourth information, and the fourth information is used to indicate the target RO; determined based on the fourth information and the fifth information, the third information includes the fourth information and the fifth information, the fourth information is used to indicate multiple ROs, and the fifth information is used to indicate one RO among the multiple ROs as the target RO; determined based on the fourth information and the third predefined rule, the third information includes the fourth information, the fourth information is used to indicate multiple ROs, and the third predefined rule predefines the selection of one RO among the multiple ROs as the target RO.

[0082] In combination with some embodiments of the second aspect, the target RO is determined based on the fourth information and the third predefined rule; the method further includes: receiving sixth information, where the sixth information is used to indicate the RO selected by the terminal.

[0083] In combination with some embodiments of the second aspect, the method further includes: receiving seventh information, where the seventh information is used to indicate a downlink time difference between the first network device and the second network device.

[0084] In combination with some embodiments of the second aspect, the second information is carried in at least one of the following ways: a defined media access control protocol data unit MAC PDU command; a newly added media access control element MAC CE for carrying the second information.

[0085] In combination with some embodiments of the second aspect, the second information includes at least one of the following parameters: a TA of the candidate cell; a cell identifier of the candidate cell; a logical identifier of the candidate cell; and a timing advance group TAG identifier of the candidate cell.

[0086] In combination with some embodiments of the second aspect, the type 1 common search space set of the physical downlink control channel and its associated CORESET are resources of the first network device or resources of the second network device.

[0087] In combination with some embodiments of the second aspect, sending the second information within the first time window includes: sending a physical downlink control channel PDCCH for scheduling physical downlink shared channel PDSCH resources within the first time window, wherein the PDSCH resources are used to send the second information.

[0088] According to a third aspect of an embodiment of the present disclosure, a random access method is provided, the method comprising: a terminal sends first information to a first network device, the first information being used to determine a timing advance TA measurement, where TA is a TA corresponding to the first network device, and the first network device is a network device of a candidate cell; a second network device sends second information to the terminal, where the second information packet is used to indicate the TA, and the second network device is a network device of a serving cell; and the terminal receives the second information sent by the second network device.

[0089] In the above embodiment, the TA of the candidate cell is sent to the terminal through the serving cell, so that the terminal can receive the TA corresponding to the candidate cell through the serving cell. For example, in the scenario of cell handover, the delay of cell handover can be reduced and the efficiency of cell handover can be improved.

[0090] According to a fourth aspect of an embodiment of the present disclosure, a terminal is provided, including: a transceiver module; the transceiver module is used to send first information to a first network device, the first information is used to determine a timing advance TA, TA is a TA corresponding to the first network device, and the first network device is a network device of a candidate cell; the transceiver module is also used to receive second information sent by a second network device, the second information is used to indicate the TA, and the second network device is a network device of a serving cell.

[0091] In the above embodiment, the TA of the candidate cell is sent to the terminal through the serving cell, so that the terminal can receive the TA corresponding to the candidate cell through the serving cell. For example, in the scenario of cell handover, the delay of cell handover can be reduced and the efficiency of cell handover can be improved.

[0092] According to a 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 second information, the second information is used to indicate a timing advance TA, TA is determined by a first network device based on the first information, TA is the TA corresponding to the first network device, the second network device is a network device of a serving cell, and the first network device is a network device of a candidate cell.

[0093] In the above embodiment, the TA of the candidate cell is sent to the terminal through the serving cell, so that the terminal can receive the TA corresponding to the candidate cell through the serving cell. For example, in the scenario of cell handover, the delay of cell handover can be reduced and the efficiency of cell handover can be improved.

[0094] According to a sixth aspect of an embodiment of the present disclosure, a terminal is provided, comprising: one or more processors; wherein the terminal is configured to execute the first aspect and any one of the random access methods in the first aspect.

[0095] In the above embodiment, the TA of the candidate cell is sent to the terminal through the serving cell, so that the terminal can receive the TA corresponding to the candidate cell through the serving cell. For example, in the scenario of cell handover, the delay of cell handover can be reduced and the efficiency of cell handover can be improved.

[0096] According to a seventh aspect of an embodiment of the present disclosure, a network device is provided, comprising: one or more processors; wherein the network device is configured to execute the second aspect and any one of the random access methods in the second aspect.

[0097] In the above embodiment, the TA of the candidate cell is sent to the terminal through the serving cell, so that the terminal can receive the TA corresponding to the candidate cell through the serving cell. For example, in the scenario of cell handover, the delay of cell handover can be reduced and the efficiency of cell handover can be improved.

[0098] According to an 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 random access methods in the first aspect, and the network device is configured to implement the second aspect and any one of the random access methods in the second aspect.

[0099] In the above embodiment, the TA of the candidate cell is sent to the terminal through the serving cell, so that the terminal can receive the TA corresponding to the candidate cell through the serving cell. For example, in the scenario of cell handover, the delay of cell handover can be reduced and the efficiency of cell handover can be improved.

[0100] 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 a random access method such as the first aspect and any one of the first aspect or the second aspect and any one of the second aspect.

[0101] In the above embodiment, the TA of the candidate cell is sent to the terminal through the serving cell, so that the terminal can receive the TA corresponding to the candidate cell through the serving cell. For example, in the scenario of cell handover, the delay of cell handover can be reduced and the efficiency of cell handover can be improved.

[0102] According to a tenth aspect of an embodiment of the present disclosure, an embodiment of the present disclosure proposes 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.

[0103] 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.

[0104] 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.

[0105] It is understood that the terminals, access network devices, network elements, core network devices, communication systems, storage media, program products, computer programs, chips, or chip systems involved in each embodiment of the present disclosure are all used to perform the methods proposed in the embodiments of the present disclosure. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects of the corresponding methods and will not be repeated here.

[0106] The present disclosure provides random access methods, apparatuses, devices, and storage media. In some embodiments, the terms "random access method" and "information processing method" and "communication method" are interchangeable; the terms "random access apparatus" and "information processing apparatus" and "communication apparatus" are interchangeable; and the terms "information processing system" and "communication system" are interchangeable.

[0107] 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.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] In the embodiments of the present disclosure, “plurality” refers to two or more.

[0112] In some embodiments, the terms "at least one," "one or more," "a plurality of," "multiple," etc. may be used interchangeably.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] In some embodiments, "network" can be interpreted as devices included in the network, such as access network equipment, core network equipment, etc.

[0121] 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.

[0122] 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.

[0123] In some embodiments, obtaining data, information, etc. may comply with the laws and regulations of the country where the data is obtained.

[0124] In some embodiments, data, information, etc. may be obtained with the user's consent.

[0125] 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.

[0126] FIG1a is a schematic diagram showing a communication system architecture according to an embodiment of the present disclosure.

[0127] As shown in FIG. 1 a , a communication system 100 includes a terminal 101 and a network device 102 .

[0128] 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.

[0129] In some embodiments, the network device 102 may include at least one of an access network device and a core network device.

[0130] 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.

[0131] 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.

[0132] 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.

[0133] 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).

[0134] 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.

[0135] 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.

[0136] 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).

[0137] In the embodiment of the present disclosure, a scenario of L1 / L2based inter-cell mobility is proposed in version (R) 18. Figure 1b shows the LTM 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 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.

[0138] 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.

[0139] It is clear that the terminal needs to perform L1 measurement on each candidate cell and report the measurement results to the network equipment of the source cell. The network equipment of the source cell can then determine whether the terminal needs to perform cell handover based on the measurement results. The source cell can also be called a serving cell.

[0140] In some embodiments, the terminal also needs to consider measuring the TA value of the terminal to each cell in advance. In some cases, at least a measurement method based on the physical downlink control channel (PDCCH) order of the random access channel (RACH) can be supported. In the process of measuring the TA of the candidate cell through the random access process, after the terminal sends the preamble sequence, it can receive the random access response (RAR) sent by the network device. For the random access process of measuring the candidate cell, the RAR of the candidate cell is not sent by the candidate cell that receives the preamble sequence, but may be sent by the serving cell.

[0141] Therefore, in this solution where the terminal sends a preamble sequence to a certain cell and another cell feeds back the RAR, it is currently unclear how the terminal receives the RAR sent by the serving cell.

[0142] In some embodiments, a schematic diagram of RAR reception in a RACH process is shown in FIG1c. After a terminal sends a message (MSG) 1 to a candidate cell in a random access channel occasion (RO), it receives a type 1 PDCCH within a RAR window. MSG1 includes a preamble sequence. In some examples, MSG1 can be a preamble sequence. The above-mentioned type 1 PDCCH can schedule a physical downlink shared channel (PDSCH) for the terminal. The candidate cell that receives MSG 1 will send a RAR to the terminal in the PDSCH. The starting position of the RAR can be the first symbol of the control resource set (CORESET) of the earliest type 1-PDCCH common search space (CSS) set after the RO. The length of the RAR window can be configured by the network device. In some examples, it can be 10 milliseconds (ms).

[0143] In some embodiments, RO may also be referred to as random access opportunity, random access time-frequency resource, etc. The present disclosure does not limit the name of RO.

[0144] However, in the PDCCH-ordered RACH for TA measurements on a candidate cell, the RAR is sent to the terminal via the serving cell. However, the RAR windows of the serving cell and the terminal do not match. For example, the serving cell does not know the location of the candidate cell's RO, and therefore cannot determine the location of the RAR window on the terminal side. Meanwhile, the candidate cell receives MSG 1, and then the serving cell needs to interact with the candidate cell before sending the RAR. This interaction takes time. By the time the serving cell completes the interaction with the candidate cell and prepares to send the RAR, the RAR window for the terminal may have already expired.

[0145] FIG2 is a schematic diagram illustrating an interaction of a random access method according to an embodiment of the present disclosure. As shown in FIG2 , the embodiment of the present disclosure relates to a random access method for a communication system 100, the method comprising:

[0146] Step S2101: The second network device sends third information to the terminal 101.

[0147] In some embodiments, the second network device sends third information to the terminal 101 .

[0148] In some embodiments, the terminal 101 receives third information sent by the second network device.

[0149] 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.

[0150] In some embodiments, terms such as "send", "transmit", "report", "download", "transmit", "bidirectional transmission", "send and / or receive" can be used interchangeably.

[0151] In some embodiments, the second network device is the network device 102. The network device 102 may be an access network device, or a core network device.

[0152] In some embodiments, the second network device may be a network device corresponding to the serving cell.

[0153] In some embodiments, the serving cell may be considered as a cell that establishes a connection with the terminal 101 and provides a service for the terminal 101. The serving cell may be a cell where the terminal 101 resides.

[0154] In some embodiments, the third information is used to instruct the terminal 101 to send the first information to the first network device.

[0155] In some embodiments, the third information is used to trigger the terminal to initiate random access to the candidate cell to perform TA measurement.

[0156] In some embodiments, the terms "component carrier (CC)", "cell", "frequency carrier", "carrier frequency" and the like can be used interchangeably.

[0157] In some embodiments, the third information may be called "indication information", "random access trigger information", "random access indication information", etc. The present disclosure does not limit the name of the third information.

[0158] In some embodiments, the third information may include the fourth information.

[0159] In some embodiments, the fourth information may indicate a synchronization signal / physical broadcast channel block (SSB) identifier. The third information may also indicate a physical random access channel (PRACH) mask identifier.

[0160] In some embodiments, the identifier may be an identity (ID) or an index.

[0161] In some embodiments, terms such as "synchronization signal (SS)", "synchronization signal block (SSB)", "reference signal (RS)", "pilot", and "pilot signal" can be used interchangeably.

[0162] In some embodiments, the fourth information may indicate an SSB index. The fourth information may also indicate a PRACH mask index.

[0163] In some embodiments, the fourth information may indicate a target RO, so that the terminal sends the first information to the first network device based on the target RO.

[0164] In some embodiments, terms such as "target", "certain", "preset", "preset", "setting", "indicated", "some", "any", and "first" can be interchangeable. "Specific A", "preset A", "preset A", "setting A", "indicated A", "some A", "any A", and "first A" can be interpreted as A pre-specified in a protocol, etc., or as A obtained through setting, configuration, or indication, etc., or as specific A, some A, any A, or first A, etc., but not limited to this.

[0165] In some embodiments, the fourth information is used to determine a unique RO. For example, the SSB index and the PRACH mask index are used to determine a unique RO. The RO can serve as a target RO. The target RO is the time-frequency resource for the terminal to send the first information to the first network device.

[0166] In some embodiments, the fourth information is used to determine multiple ROs. For example, the SSB index and the PRACH mask index can be used to determine multiple ROs. The terminal determines one RO from the multiple ROs as the target RO.

[0167] In some embodiments, the fourth information is used to determine multiple ROs. The terminal can determine one RO from the multiple ROs as the target RO based on its own specific implementation. Of course, the specific implementation of the terminal can be set accordingly according to actual conditions and is not limited by this disclosure.

[0168] For example, the terminal determines, based on its own implementation, an RO that is closest to the time when the third information is received, such as determining an RO that is closest to the time when the third information is currently received.

[0169] In some embodiments, the terminal may determine the target RO based on the fourth information and a third predefined rule, wherein the third predefined rule predefines which RO to select from a plurality of ROs.

[0170] For example, the terminal determines multiple ROs according to the fourth information, and selects one RO from the multiple ROs according to the third predefined rule. The selected RO may serve as the target RO.

[0171] In some embodiments, the fourth information is used to determine a plurality of ROs. In this case, the third information may further include fifth information. The fifth information is used to indicate one of the plurality of ROs.

[0172] For example, the terminal may determine multiple ROs based on the fourth information, and determine one RO as the target RO from the multiple ROs based on the fifth information. In this case, it can also be considered that the serving cell indicates a unique RO in the third information, and the method used is to further determine a fixed RO from the multiple ROs.

[0173] 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.

[0174] In some embodiments, the sending of information from a network device to a terminal may be referred to as downlink communication. The network device may be a first network device or a second network device.

[0175] In some embodiments, the first network device and the second network device may be different network devices that perform cell switching between different cells under the same gNB.

[0176] In some embodiments, the terms "downlink", "physical downlink", etc. can be used interchangeably.

[0177] In some embodiments, the solutions involved in various embodiments of the present disclosure may be used in a cell handover scenario, for example, a cell handover under the same central unit (CU).

[0178] Step S2102: Terminal 101 sends sixth information to the second network device.

[0179] In some embodiments, the terminal 101 receives sixth information sent by the second network device.

[0180] In some embodiments, the second network device sends sixth information to the terminal 101 .

[0181] In some embodiments, the sixth information is used to indicate the target RO selected by the terminal.

[0182] For example, the terminal implements the target RO selected from the plurality of ROs indicated by the fourth information based on itself.

[0183] In some embodiments, when the target RO is indicated by the fourth information and the fifth information, considering that the fourth information and the fifth information are both included in the third information sent by the second network device, it can be considered that the second network device knows the target RO in this case. Therefore, in this case, step S2102 can be directly skipped.

[0184] In some embodiments, the sending of information from a terminal to a network device may be referred to as uplink communication, wherein the network device may be a first network device or a second network device.

[0185] In some embodiments, the terms "uplink", "uplink", "physical uplink", etc. can be used interchangeably.

[0186] Step S2103: Terminal 101 sends seventh information to the second network device.

[0187] In some embodiments, the terminal 101 receives seventh information sent by the second network device.

[0188] In some embodiments, the second network device sends seventh information to the terminal 101 .

[0189] In some embodiments, the seventh information is used to indicate a downlink time difference between the first network device and the second network device.

[0190] For example, the terminal may determine the downlink time difference between the first network device and the second network device based on the downlink timing of the serving cell and the downlink timing of the candidate cell, and report the time difference to the second network device.

[0191] It can be understood that the terminal sends the downlink time difference between the first network device and the second network device to the second network device, so that the second network device can determine the time domain location of the target RO based on the time difference, thereby facilitating the subsequent sending of the second information by the second network device and the reception of the second information by the terminal.

[0192] Of course, in some embodiments, if the downlink times between the first network device and the second network device are synchronized, or in other words, the downlink time difference is 0, step S2103 may be skipped.

[0193] In some embodiments, the second network device can determine the downlink time difference between the first network device and the second network device based on the interaction with the first network device. In this case, step S2103 can be skipped and the subsequent step S2104 can be directly executed.

[0194] In some embodiments, terms such as "moment", "time point", "time", and "time position" can be replaced with each other, and terms such as "duration", "period", "time window", "window", and "time" can be replaced with each other.

[0195] In some embodiments, the order of step S2103 and step S2102 is not strictly defined. Step S2102 may be performed first, followed by step S2103; step S2103 may be performed first, followed by step S2102; or step S2102 and step S2103 may be performed simultaneously. This disclosure does not limit this.

[0196] In some embodiments, the order of step S2103 and step S2101 is not strictly defined. Step S2101 may be performed first, followed by step S2103; step S2103 may be performed first, followed by step S2101; or step S2101 and step S2103 may be performed simultaneously. This disclosure does not limit this.

[0197] In some embodiments, step S2103 is performed first, and then step S2101 is performed.

[0198] Of course, if step S2102 and step S2103 are executed simultaneously, step S2101 and step S2103 cannot be executed simultaneously; and if step S2101 and step S2103 are executed simultaneously, step S2102 and step S2103 cannot be executed simultaneously. In other words, step S2101 and step S2102 cannot be executed simultaneously.

[0199] Step S2104: Terminal 101 sends first information to the first network device.

[0200] In some embodiments, the terminal 101 receives first information sent by the first network device.

[0201] In some embodiments, the first network device sends first information to the terminal 101 .

[0202] In some embodiments, the first network device is network device 102. Network device 102 may be an access network device or a core network device. The access network device may be a base station, a transmission and receiving point (TRP), or the like. Of course, the terminal has not yet established random access with the first network device. Therefore, it should be understood that the access network device referred to in this disclosure is not necessarily a network device to which the terminal has successfully accessed.

[0203] In some embodiments, the first network device may be a network device corresponding to the candidate cell.

[0204] It can be understood that the first network device and the second network device are different network devices. It can also be considered that the cells corresponding to the first network device and the second network device are not the same cell.

[0205] In some embodiments, the candidate cell is a target cell that the terminal is preparing to perform random access.

[0206] In some embodiments, the first information is used by the first network device to perform TA measurement.

[0207] In some embodiments, the first message may be MSG 1 .

[0208] In some embodiments, the first information may be a preamble code. The first information may also be referred to as a preamble code sequence.

[0209] In some embodiments, the first information may be referred to as "message 1", "information 1", "preamble code", "preamble code sequence", "random access message 1", "MSG 1", "pseudo-random sequence", etc. The present disclosure does not limit the name of the first information.

[0210] Step S2105: The first network device sends eighth information to the second network device.

[0211] In some embodiments, the second network device receives the eighth information sent by the first network device.

[0212] In some embodiments, the first network device sends eighth information to the second network device.

[0213] In some embodiments, the eighth information is used to indicate a TA value measured by the first network device.

[0214] In some embodiments, after receiving the first information sent by the terminal 101, the first network device sends eighth information indicating the TA to the second network device, so that the second network device can indicate the TA value measured by the first network device to the terminal.

[0215] For example, after the first network device receives the preamble sequence sent by the terminal 101, it measures and obtains the TA corresponding to the first network device. The first network device sends the eighth information indicating the TA to the second network device. So that the second network device can indicate the TA value measured by the first network device to the terminal based on the eighth information. In some embodiments, the eighth information may include a random access radio network temporary identity (RA-RNTI). The eighth information may also include a cell radio network temporary identity (C-RNTI). Furthermore, whether the eighth information includes RA-RNTI and / or C-RNTI is related to whether the terminal 101 sends MSG 3 to the first network device in accordance with the normal process.

[0216] Step S2106: The second network device sends second information to the terminal 101.

[0217] In some embodiments, the second network device sends second information to the terminal 101 .

[0218] In some embodiments, terminal 101 receives second information sent by a second network device.

[0219] In some embodiments, the second information is used to indicate a TA corresponding to the first network device.

[0220] For example, the second information includes a TA value measured by the first network device.

[0221] In some embodiments, the second information may be referred to as RAR.

[0222] In some embodiments, the second information may also be referred to as "random access response information", "random access response message", "candidate cell RAR", "candidate cell random access corresponding information", etc. The present disclosure does not limit the name of the second information.

[0223] In some embodiments, the second information may be carried by a defined medium access control protocol data unit (MAC PDU) command.

[0224] For example, a new MAC PDU is defined to carry the second information.

[0225] In some embodiments, the second information may be carried by a newly added medium access control element (MAC CE).

[0226] For example, a MAC CE dedicated to carrying the second information is added, and the second information is carried through the added MAC CE.

[0227] In some embodiments, the second information can be carried by either MAC PDU or MAC CE.

[0228] In some embodiments, the second information may include the TA of the candidate cell.

[0229] In some embodiments, the second information may include an identification of the candidate cell.

[0230] For example, the second information includes a candidate cell ID.

[0231] In some embodiments, the second information may include a logical identifier of the candidate cell.

[0232] For example, the second information includes a candidate cell logical ID, where the logical ID may be an RRC configuration parameter ID.

[0233] In some embodiments, the second information may include a timing advance group (TAG) identifier of the candidate cell.

[0234] For example, the second information includes the TAG ID of the candidate cell.

[0235] In some embodiments, the second information may further include: at least one of the TA of the candidate cell, the identifier of the candidate cell, the logical identifier of the candidate cell, and the timing advance group identifier of the candidate cell.

[0236] In some embodiments, the second network device may transmit a Type 1 PDCCH for scheduling a PDSCH for transmitting the second information based on the first time window.

[0237] In some embodiments, the terminal may receive a Type 1 PDCCH for scheduling a PDSCH for transmitting the second information within the first time window.

[0238] For example, the terminal receives a type-1 PDCCH in the first time window. The type-1 PDCCH is used to schedule PDSCH resources, and the second network device can send the second information through the PDSCH resources. The terminal 101 can receive the second information on the PDSCH resources.

[0239] Of course, the PDSCH may be located within the first time window or outside the first time window, which is not limited in the present disclosure.

[0240] It is worth noting that in each embodiment of the present disclosure, the terminal receives the second information on the PDSCH resource scheduled by the type-1 PDCCH within the first time window, which can also be referred to as receiving the second information within the first time window, that is, the above different description methods can be used interchangeably, and the present disclosure does not limit this.

[0241] In some embodiments, the terms "physical downlink shared channel (PDSCH)", "DL data", etc. may be used interchangeably.

[0242] In some embodiments, the first time window may be considered as a time window in which the terminal 101 receives a Type 1 PDCCH for scheduling a PDSCH for transmitting the second information.

[0243] In some embodiments, the first time window may also be considered as a time window for the second network device to send the second information.

[0244] In some embodiments, the first time window may be referred to as a RAR time window, or RAR window. The present disclosure does not limit the name of the first time window.

[0245] In some embodiments, the first time window may be determined by configuration information of the serving cell.

[0246] For example, the first time window is determined by the RACH configuration (config) of the serving cell.

[0247] In some embodiments, the first time window can be considered as the RAR window corresponding to the second network device. Compared to the RAR window corresponding to the candidate cell, the starting position of the RAR window corresponding to the second network device can be later than the starting position of the RAR window corresponding to the candidate cell. For another example, the ending position of the RAR window corresponding to the second network device can be later than the ending position of the RAR window corresponding to the candidate cell. The duration of the RAR window corresponding to the second network device can be greater than the duration of the RAR window corresponding to the candidate cell.

[0248] In some embodiments, the first time window includes a first duration, wherein the first duration is the duration of the first time window.

[0249] In some embodiments, the first duration may be determined based on a first predefined rule, wherein the first predefined rule predefines the first duration.

[0250] For example, the first predefined rule predefines the duration of the RAR window, so that the terminal can correctly receive the second information within the first time window.

[0251] In some embodiments, the first duration may be based on a network device configuration.

[0252] For example, the first duration is determined based on the second network device configuration.

[0253] In some embodiments, the first duration may be determined based on a second duration and a third duration, wherein the second duration is a duration configured by the network device, and the third duration is configured by the network device or determined based on a first predefined rule.

[0254] For example, the second network device can be configured with a second duration. This second duration can be considered the duration of a RAR window known in the related art. It is understood that this second duration does not take into account the time generated by the interaction between the first and second network devices. Therefore, the terminal may be unable to receive the second information based on the second duration. For example, when the second network device sends the second information, the RAR window corresponding to the second duration has already expired.

[0255] For another example, the third duration may be configured by the second network device.

[0256] For another example, the third duration may be predefined by the first predefined rule.

[0257] In some embodiments, the second duration may be at most 10 ms.

[0258] In some embodiments, the third duration may be greater than or equal to the duration of the interaction between the first network device and the second network device.

[0259] For example, the third duration may be recorded as L.

[0260] In some embodiments, the first duration may be equal to the sum of the second duration and L.

[0261] In some embodiments, considering that the first duration is equal to the sum of the second duration and L, the first duration may exceed 10 ms. That is, if the terminal receives the second information after 10 ms of the first time window, the RAR may conflict with the RAR of other frames. In this case, the second information may include information indicating the system frame number (SFN).

[0262] For example, if RAR window 1, in which the terminal receives the second information, corresponds to the first frame, the starting position of RAR window 1 can also be considered within the first frame. Assuming that a frame can be 10 ms long, and the first duration is the sum of the second duration and L, and is greater than 10 ms, then RAR window 1 will span the first frame and its adjacent second frame. However, the second frame also has its own corresponding RAR window, such as RAR window 2. If the terminal receives the second information in RAR window 1 of the second frame, it will not know whether the second information corresponds to the RAR corresponding to the first frame or the second frame.

[0263] For another example, terminal 1 initiates random access in RO 1 within frame A, while terminal 2 initiates random access in the same RO 1 within frame B. Assume that frame B precedes and is adjacent to frame A. If the RAR window corresponding to terminal 2 spans frames A and B, the RAR corresponding to terminal 2 may not be received until frame A. However, terminal 1 may receive the RAR corresponding to terminal 2 during reception, resulting in a RAR conflict.

[0264] Of course, similar situations caused by other possible principles are not excluded. Therefore, the second information may also include information indicating the SFN. The SFN indicated by this information can be used to determine which system frame the received RAR corresponds to, thereby avoiding RAR conflicts between RACHs of different SFNs.

[0265] In some embodiments, terms such as "frame", "radio frame", "slot", "sub-slot", "mini-slot", "symbol", "symbol", and "transmission time interval (TTI)" can be used interchangeably.

[0266] In some embodiments, the first time window includes a first time domain position, wherein the first time domain position may be a starting position of the first time window.

[0267] In some embodiments, the first time domain position may be determined based on a second predefined rule, wherein the second predefined rule predefines the first time domain position.

[0268] For example, the second predefined rule predefines the starting time domain position of the RAR window.

[0269] In some embodiments, the first time-domain location may be based on a network device configuration.

[0270] For example, the first time domain position is determined based on the second network device configuration.

[0271] In some embodiments, the first time domain position may be determined based on the second time domain position and a fourth duration, wherein the second time domain position is the end position of the RO that sends the first information, and the fourth duration is the time domain offset between the first time domain position and the second time domain position.

[0272] In some embodiments, the time domain offset between the first time domain position and the second time domain position may be denoted as T or offset.

[0273] For example, the second time domain position can be determined based on the end position of the target RO. The time domain offset between the first time domain position and the second time domain position can be configured by the second network device, or the time domain offset between the first time domain position and the second time domain position can be specified by the protocol. The first time domain position is determined based on the end position of the target RO and T, that is, the first time domain position is the time domain position after the end position of the target RO and T.

[0274] In some embodiments, the terminal may receive type-1 PDCCH in the RAR window according to the Type 1 common search space and the corresponding CORESET configuration. Of course, how the terminal determines the timing of detecting type-1 PDCCH can refer to relevant solutions, and the specific process will not be repeated in this disclosure.

[0275] In some embodiments, the terms "search space", "search space set", "search space configuration", "search space set configuration", etc. can be used interchangeably.

[0276] In some embodiments, when the first time domain position is determined based on the second time domain position and the fourth duration, the first time domain position may be the first orthogonal frequency division multiplexing (OFDM) symbol after the second time domain position passes through the fourth duration.

[0277] For example, the starting position of the RAR window may be the first OFDM symbol after T after the target RO ends.

[0278] In some embodiments, for the case where the first time domain position is determined based on the second time domain position and the fourth duration, the first time domain position may be the first OFDM symbol of the control resource set CORESET corresponding to the type 1 common search space set of the physical downlink control channel of the first network device or the second network device received by the terminal after the fourth duration of the second time domain position.

[0279] For example, the starting position of the RAR window may be the first OFDM symbol of the earliest CORESET corresponding to the type-1 CSS set for receiving the PDCCH after T ends after the target RO ends.

[0280] In some embodiments, the type-1 CSS set and the corresponding CORESET configuration may be for a serving cell.

[0281] In some embodiments, the type-1 CSS set and the corresponding CORESET configuration may be for a candidate cell.

[0282] In some embodiments, after receiving the second information, the terminal may perform RAR descrambling on the second information.

[0283] For example, when the RAR is scrambled using the RA-RNTI, the terminal can descramble the RAR based on the RA-RNTI. For details on the RAR scrambling and descrambling processes, please refer to the relevant solutions, which will not be described in detail in this disclosure.

[0284] In some embodiments, if the terminal does not receive the eighth information sent by the second network device, the terminal may choose to resend the first information to the first network device.

[0285] Of course, considering the possibility that the first network device may not receive the first information due to low power for sending the first information, the terminal may increase the sending power to resend the first information to the first network device.

[0286] In some embodiments, the solutions involved in various embodiments of the present disclosure can be applied to non-contention random access scenarios.

[0287] The perception communication method involved in the embodiments of the present disclosure may include at least one of steps S2101 to S2106. For example, steps S2104+S2106 may be implemented as an independent embodiment, steps S2104+S2105+S2106 may be implemented as an independent embodiment, steps S2101+S2104+S2106 may be implemented as an independent embodiment, steps S2101+S2104+S2105+S2106 may be implemented as an independent embodiment, steps S2101+S2102+S2104+S2106 may be implemented as an independent embodiment, steps S2101+S2103+S2104+S2106 may be implemented as an independent embodiment, and steps S2101+S2102+S2103+S2104+S2106 may be implemented as an independent embodiment, but the present invention is not limited thereto.

[0288] In some embodiments, steps S2102 and S2103 may be executed in an interchangeable order or simultaneously with S2101 .

[0289] In some embodiments, step S2102 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0290] In some embodiments, step S2103 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0291] In some embodiments, step S2101 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0292] In some embodiments, reference may be made to other optional implementations described before or after the description corresponding to FIG. 2 .

[0293] Figure 3a is a flow chart of a random access method according to an exemplary embodiment. As shown in Figure 3a, the embodiment of the present disclosure relates to a random access method that can be executed on a terminal. The method includes:

[0294] Step S3101, obtain third information.

[0295] 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.

[0296] In some embodiments, the terminal obtains third information specified by the protocol.

[0297] In some embodiments,

[0298] In some embodiments, the terminal performs processing to obtain the third information.

[0299] Step S3102, sending the sixth information.

[0300] The optional implementation of step S3102 can refer to the optional implementation of step S2102 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0301] Step S3103, sending the seventh information.

[0302] The optional implementation of step S3103 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.

[0303] Step S3104, sending the first information.

[0304] The optional implementation of step S3104 can refer to the optional implementation of step S2104 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0305] Step S3105, obtaining the second information.

[0306] The optional implementation of step S3105 can refer to the optional implementation of step S2106 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0307] In some embodiments, the terminal obtains second information specified by the protocol.

[0308] In some embodiments, the terminal obtains the second information from a higher layer.

[0309] In some embodiments, the terminal performs processing to obtain the second information.

[0310] In some embodiments, step S3105 is omitted, and the terminal autonomously implements the function indicated by the second information, or the above function is default or acquiescent.

[0311] FIG3b is a flow chart of another random access method according to an exemplary embodiment. As shown in FIG3b, the embodiment of the present disclosure relates to a random access method that can be executed on a terminal. The method includes:

[0312] Step S3201, obtain third information.

[0313] The optional implementation of step S3201 can refer to the optional implementation of step S2101 in Figure 2, the optional implementation of step S3101 in Figure 3a, and other related parts in the embodiment involved in Figure 2 and other related parts in the embodiment involved in Figure 3a, which will not be repeated here.

[0314] In some embodiments, step S3201 is omitted, and the terminal autonomously implements the function indicated by the third information, or the above function is default or by default.

[0315] Step S3202, sending the sixth information.

[0316] The optional implementation of step S3202 can refer to the optional implementation of step S2102 in Figure 2, the optional implementation of step S3102 in Figure 3a, and other related parts in the embodiment involved in Figure 2 and other related parts in the embodiment involved in Figure 3a, which will not be repeated here.

[0317] Step S3203, sending the first information.

[0318] The optional implementation of step S3203 can refer to the optional implementation of step S2104 in Figure 2, the optional implementation of step S3104 in Figure 3a, and other related parts in the embodiment involved in Figure 2 and other related parts in the embodiment involved in Figure 3a, which will not be repeated here.

[0319] Step S3204, obtaining the second information.

[0320] The optional implementation of step S3204 can refer to the optional implementation of step S2106 in Figure 2, the optional implementation of step S3105 in Figure 3a, and other related parts in the embodiment involved in Figure 2 and other related parts in the embodiment involved in Figure 3a, which will not be repeated here.

[0321] In some embodiments, step S3204 is omitted, and the terminal autonomously implements the function indicated by the second information, or the above function is default or by default.

[0322] Figure 3c is a flow chart of another random access method according to an exemplary embodiment. As shown in Figure 3c, the embodiment of the present disclosure relates to a random access method that can be executed on a terminal. The method includes:

[0323] Step S3301, obtain third information.

[0324] The optional implementation method of step S3301 can be found in the optional implementation method of step S2101 in Figure 2, the optional implementation method of step S3101 in Figure 3a, the optional implementation method of step S3201 in Figure 3b, and other related parts in the embodiment involved in Figure 2, other related parts in the embodiment involved in Figure 3a, and other related parts in the embodiment involved in Figure 3b, which will not be repeated here.

[0325] In some embodiments, step S3301 is omitted, and the terminal autonomously implements the function indicated by the third information, or the above function is default or by default.

[0326] Step S3302, sending the seventh information.

[0327] The optional implementation of step S3302 can refer to the optional implementation of step S2103 in Figure 2, the optional implementation of step S3103 in Figure 3a, and other related parts in the embodiment involved in Figure 2 and other related parts in the embodiment involved in Figure 3a, which will not be repeated here.

[0328] Step S3303, sending the first information.

[0329] The optional implementation method of step S3303 can be found in the optional implementation method of step S2104 in Figure 2, the optional implementation method of step S3104 in Figure 3a, the optional implementation method of step S3203 in Figure 3b, and other related parts in the embodiment involved in Figure 2, other related parts in the embodiment involved in Figure 3a, and other related parts in the embodiment involved in Figure 3b, which will not be repeated here.

[0330] Step S3304, obtain the second information.

[0331] The optional implementation method of step S3304 can refer to the optional implementation method of step S2106 in Figure 2, the optional implementation method of step S3105 in Figure 3a, the optional implementation method of step S3204 in Figure 3b, and other related parts in the embodiment involved in Figure 2, other related parts in the embodiment involved in Figure 3a, and other related parts in the embodiment involved in Figure 3b, which will not be repeated here.

[0332] In some embodiments, step S3304 is omitted, and the terminal autonomously implements the function indicated by the second information, or the above function is default or by default.

[0333] Figure 3d is a flow chart of another random access method according to an exemplary embodiment. As shown in Figure 3d, the embodiment of the present disclosure relates to a random access method that can be executed on a terminal. The method includes:

[0334] Step S3401, obtain third information.

[0335] The optional implementation method of step S3401 can refer to the optional implementation method of step S2101 in Figure 2, the optional implementation method of step S3101 in Figure 3a, the optional implementation method of step S3201 in Figure 3b, the optional implementation method of step S3301 in Figure 3c, and other related parts in the embodiment involved in Figure 2, other related parts in the embodiment involved in Figure 3a, other related parts in the embodiment involved in Figure 3b, and other related parts in the embodiment involved in Figure 3c, which will not be repeated here.

[0336] In some embodiments, step S3401 is omitted, and the terminal autonomously implements the function indicated by the third information, or the above function is default or by default.

[0337] Step S3402, sending the first information.

[0338] The optional implementation method of step S3402 can refer to the optional implementation method of step S2104 in Figure 2, the optional implementation method of step S3104 in Figure 3a, the optional implementation method of step S3203 in Figure 3b, the optional implementation method of step S3303 in Figure 3c, and other related parts in the embodiment involved in Figure 2, other related parts in the embodiment involved in Figure 3a, other related parts in the embodiment involved in Figure 3b, and other related parts in the embodiment involved in Figure 3c, which will not be repeated here.

[0339] Step S3403, obtain the second information.

[0340] For the optional implementation of step S3403, please refer to the optional implementation of step S2106 in Figure 2, the optional implementation of step S3105 in Figure 3a, the optional implementation of step S3204 in Figure 3b, the optional implementation of step S3304 in Figure 3c, and other related parts in the embodiment involved in Figure 2, other related parts in the embodiment involved in Figure 3a, other related parts in the embodiment involved in Figure 3b, and other related parts in the embodiment involved in Figure 3c, which will not be repeated here.

[0341] In some embodiments, step S3403 is omitted, and the terminal autonomously implements the function indicated by the second information, or the above function is default or by default.

[0342] Figure 3e is a flow chart of another random access method according to an exemplary embodiment. As shown in Figure 3e, the embodiment of the present disclosure relates to a random access method that can be executed on a terminal. The method includes:

[0343] Step S3501, sending the first information.

[0344] For the optional implementation of step S3501, please refer to the optional implementation of step S2104 in Figure 2, the optional implementation of step S3104 in Figure 3a, the optional implementation of step S3203 in Figure 3b, the optional implementation of step S3303 in Figure 3c, the optional implementation of step S3402 in Figure 3d, and other related parts in the embodiment involved in Figure 2, other related parts in the embodiment involved in Figure 3a, other related parts in the embodiment involved in Figure 3b, other related parts in the embodiment involved in Figure 3c, and other related parts in the embodiment involved in Figure 3d, which will not be repeated here.

[0345] In some embodiments, the method further includes: receiving third information sent by the second network device, where the third information is used to instruct the first information to be sent to the first network device.

[0346] In some embodiments, sending first information to a first network device includes: sending first information to the first network device based on a target RO; wherein the target RO is determined by at least one of the following methods: determined based on fourth information, the third information includes fourth information, and the fourth information is used to indicate the target RO; determined based on fourth information and fifth information, the third information includes fourth information and fifth information, the fourth information is used to indicate multiple ROs, and the fifth information is used to indicate that one of the multiple ROs is the target RO; determined based on the fourth information and a third predefined rule, the third information includes fourth information, the fourth information is used to indicate multiple ROs, and the third predefined rule predefines the selection of one of the multiple ROs as the target RO.

[0347] In some embodiments, the target RO is determined based on the fourth information and the third predefined rule; the method further includes: sending sixth information, the sixth information being used to indicate the selected RO to the second network device.

[0348] In some embodiments, the method further includes: sending seventh information, where the seventh information is used to indicate a downlink time difference between the first network device and the second network device.

[0349] Step S3502, obtaining second information.

[0350] For the optional implementation of step S3502, please refer to the optional implementation of step S2106 in Figure 2, the optional implementation of step S3105 in Figure 3a, the optional implementation of step S3204 in Figure 3b, the optional implementation of step S3304 in Figure 3c, the optional implementation of step S3403 in Figure 3d, and other related parts in the embodiment involved in Figure 2, other related parts in the embodiment involved in Figure 3a, other related parts in the embodiment involved in Figure 3b, other related parts in the embodiment involved in Figure 3c, and other related parts in the embodiment involved in Figure 3d, which will not be repeated here.

[0351] In some embodiments, step S3502 is omitted, and the terminal autonomously implements the function indicated by the second information, or the above function is default or by default.

[0352] In some embodiments, receiving the second information sent by the second network device includes: receiving the second information sent by the second network device within a first time window, wherein the first time window is determined based on a first time domain position and a first duration.

[0353] In some embodiments, the first duration is determined in at least one of the following ways: based on a first predefined rule, wherein the first predefined rule predefines the first duration; based on a network device configuration; based on a second duration and a third duration, wherein the second duration is the duration configured by the network device, and the third duration is determined by the network device configuration or based on the first predefined rule.

[0354] In some embodiments, the first duration is determined based on the second duration and the third duration; and the second information includes information indicating a system frame number.

[0355] In some embodiments, the first time domain position is determined by at least one of the following methods: based on a second predefined rule, wherein the second predefined rule predefines the first time domain position; based on the network device configuration; based on the second time domain position and a fourth duration, wherein the second time domain position is the end position of the random access transmission resource RO for sending the first information, and the fourth duration is used to indicate the time domain offset between the first time domain position and the second time domain position.

[0356] In some embodiments, the first time domain position is determined based on the second time domain position and a fourth duration; the first time domain position is the first orthogonal frequency division multiplexing OFDM symbol after the second time domain position has passed the fourth duration.

[0357] In some embodiments, the first time domain position is determined based on the second time domain position and the fourth duration; after the first time domain position is the second time domain position after the fourth duration, the terminal receives the first OFDM symbol of the control resource set CORESET corresponding to the first type 1 common search space set for sending the physical downlink control channel of the first network device or the second network device.

[0358] In some embodiments, the second information is carried in at least one of the following ways: a defined Media Access Control Protocol Data Unit (MAC PDU) command; or a newly added Media Access Control Element (MAC CE) for carrying the second information.

[0359] In some embodiments, the second information includes at least one of the following parameters: a TA of the candidate cell; a cell identifier of the candidate cell; a logical identifier of the candidate cell; and a timing advance group TAG identifier of the candidate cell.

[0360] In some embodiments, the type 1 common search space set of the physical downlink control channel and its associated CORESET are resources of the first network device or resources of the second network device.

[0361] In some embodiments, receiving second information sent by a second network device within a first time window includes: receiving a physical downlink control channel PDCCH for scheduling physical downlink shared channel PDSCH resources within the first time window, wherein the PDSCH resources are used to send the second information.

[0362] FIG4a is a flow chart of another random access method according to an exemplary embodiment. As shown in FIG4a, the embodiment of the present disclosure relates to a random access method, which can be executed on a second network device. The method includes:

[0363] Step S4101, sending the third information.

[0364] The optional implementation of step S4101 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.

[0365] Step S4102, obtaining sixth information.

[0366] The optional implementation of step S4102 can refer to the optional implementation of step S2102 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0367] In some embodiments, the second network device obtains sixth information specified by the protocol.

[0368] In some embodiments, the second network device obtains the sixth information from a higher layer.

[0369] In some embodiments, the second network device performs processing to obtain the sixth information.

[0370] In some embodiments, step S4102 is omitted, and the second network device autonomously implements the function indicated by the sixth information, or the above function is default or by default.

[0371] Step S4103, obtain the seventh information.

[0372] The optional implementation of step S4103 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.

[0373] In some embodiments, the second network device obtains seventh information specified by the protocol.

[0374] In some embodiments, the second network device obtains the seventh information from a higher layer.

[0375] In some embodiments, the second network device performs processing to obtain the seventh information.

[0376] In some embodiments, step S4103 is omitted, and the second network device autonomously implements the function indicated by the seventh information, or the above function is default or by default.

[0377] Step S4104, obtaining first information.

[0378] The optional implementation of step S4104 can refer to the optional implementation of step S2104 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0379] In some embodiments, the second network device obtains first information specified by the protocol.

[0380] In some embodiments, the second network device obtains the first information from a higher layer.

[0381] In some embodiments, the second network device performs processing to obtain the first information.

[0382] In some embodiments, step S4104 is omitted, and the second network device autonomously implements the function indicated by the first information, or the above function is default or acquiescent.

[0383] Step S4105, obtain the eighth information.

[0384] The optional implementation of step S4105 can refer to the optional implementation of step S2105 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0385] In some embodiments, the second network device obtains eighth information specified by the protocol.

[0386] In some embodiments, the second network device obtains the eighth information from a higher layer.

[0387] In some embodiments, the second network device performs processing to obtain the eighth information.

[0388] In some embodiments, step S4105 is omitted, and the second network device autonomously implements the function indicated by the eighth information, or the above function is default or acquiescent.

[0389] Step S4106, sending the second information.

[0390] The optional implementation of step S4106 can refer to the optional implementation of step S2106 in Figure 2 and other related parts in the embodiment involved in Figure 2, which will not be repeated here.

[0391] FIG4b is a flow chart of another random access method according to an exemplary embodiment. As shown in FIG4b, the embodiment of the present disclosure relates to a random access method that can be executed on a second network device. The method includes:

[0392] Step S4201, sending the third information.

[0393] The optional implementation of step S4201 can refer to the optional implementation of step S2101 in Figure 2, the optional implementation of step S4101 in Figure 4a, and other related parts in the embodiment involved in Figure 2 and other related parts in the embodiment involved in Figure 4a, which will not be repeated here.

[0394] Step S4202, obtain sixth information.

[0395] The optional implementation of step S4202 can refer to the optional implementation of step S2102 in Figure 2, the optional implementation of step S4102 in Figure 4a, and other related parts in the embodiment involved in Figure 2 and other related parts in the embodiment involved in Figure 4a, which will not be repeated here.

[0396] In some embodiments, step S4202 is omitted, and the second network device autonomously implements the function indicated by the sixth information, or the above function is default or by default.

[0397] Step S4203, obtain first information.

[0398] The optional implementation of step S4203 can refer to the optional implementation of step S2104 in Figure 2, the optional implementation of step S4104 in Figure 4a, and other related parts in the embodiment involved in Figure 2 and other related parts in the embodiment involved in Figure 4a, which will not be repeated here.

[0399] In some embodiments, step S4203 is omitted, and the second network device autonomously implements the function indicated by the first information, or the above function is default or by default.

[0400] Step S4204, obtain the eighth information.

[0401] The optional implementation of step S4204 can refer to the optional implementation of step S2105 in Figure 2, the optional implementation of step S4105 in Figure 4a, and other related parts in the embodiment involved in Figure 2 and other related parts in the embodiment involved in Figure 4a, which will not be repeated here.

[0402] In some embodiments, step S4204 is omitted, and the second network device autonomously implements the function indicated by the eighth information, or the above function is default or by default.

[0403] Step S4205, sending the second information.

[0404] The optional implementation of step S4205 can refer to the optional implementation of step S2106 in Figure 2, the optional implementation of step S4106 in Figure 4a, and other related parts in the embodiment involved in Figure 2 and other related parts in the embodiment involved in Figure 4a, which will not be repeated here.

[0405] Figure 4c is a flow chart of another random access method according to an exemplary embodiment. As shown in Figure 4c, the embodiment of the present disclosure relates to a random access method that can be executed on a second network device. The method includes:

[0406] Step S4301, sending the third information.

[0407] The optional implementation method of step S4301 can refer to the optional implementation method of step S2101 in Figure 2, the optional implementation method of step S4101 in Figure 4a, the optional implementation method of step S4201 in Figure 4b, and other related parts in the embodiment involved in Figure 2, other related parts in the embodiment involved in Figure 4a, and other related parts in the embodiment involved in Figure 4b, which will not be repeated here.

[0408] Step S4302, obtain the seventh information.

[0409] The optional implementation of step S4302 can refer to the optional implementation of step S2103 in Figure 2, the optional implementation of step S4103 in Figure 4a, and other related parts in the embodiment involved in Figure 2 and other related parts in the embodiment involved in Figure 4a, which will not be repeated here.

[0410] In some embodiments, step S4302 is omitted, and the second network device autonomously implements the function indicated by the sixth information, or the above function is default or by default.

[0411] Step S4303, obtain first information.

[0412] The optional implementation method of step S4303 can be found in the optional implementation method of step S2104 in Figure 2, the optional implementation method of step S4104 in Figure 4a, the optional implementation method of step S4203 in Figure 4b, and other related parts in the embodiment involved in Figure 2, other related parts in the embodiment involved in Figure 4a, and other related parts in the embodiment involved in Figure 4b, which will not be repeated here.

[0413] In some embodiments, step S4303 is omitted, and the second network device autonomously implements the function indicated by the first information, or the above function is default or by default.

[0414] Step S4304, obtain the eighth information.

[0415] The optional implementation method of step S4304 can refer to the optional implementation method of step S2105 in Figure 2, the optional implementation method of step S4105 in Figure 4a, the optional implementation method of step S4204 in Figure 4b, and other related parts in the embodiment involved in Figure 2, other related parts in the embodiment involved in Figure 4a, and other related parts in the embodiment involved in Figure 4b, which will not be repeated here.

[0416] In some embodiments, step S4304 is omitted, and the second network device autonomously implements the function indicated by the eighth information, or the above function is default or by default.

[0417] Step S4305, sending the second information.

[0418] The optional implementation method of step S4305 can be found in the optional implementation method of step S2106 in Figure 2, the optional implementation method of step S4106 in Figure 4a, the optional implementation method of step S4205 in Figure 4b, and other related parts in the embodiment involved in Figure 2, other related parts in the embodiment involved in Figure 4a, and other related parts in the embodiment involved in Figure 4b, which will not be repeated here.

[0419] FIG4 d is a flow chart of another random access method according to an exemplary embodiment. As shown in FIG4 d , the embodiment of the present disclosure relates to a random access method that can be executed on a second network device. The method includes:

[0420] Step S4401, sending the third information.

[0421] The optional implementation method of step S4401 can refer to the optional implementation method of step S2101 in Figure 2, the optional implementation method of step S4101 in Figure 4a, the optional implementation method of step S4201 in Figure 4b, the optional implementation method of step S4301 in Figure 4c, and other related parts in the embodiment involved in Figure 2, other related parts in the embodiment involved in Figure 4a, other related parts in the embodiment involved in Figure 4b, and other related parts in the embodiment involved in Figure 4c, which will not be repeated here.

[0422] Step S4402, obtaining first information.

[0423] The optional implementation method of step S4402 can refer to the optional implementation method of step S2104 in Figure 2, the optional implementation method of step S4104 in Figure 4a, the optional implementation method of step S4203 in Figure 4b, the optional implementation method of step S4303 in Figure 4c, and other related parts in the embodiment involved in Figure 2, other related parts in the embodiment involved in Figure 4a, other related parts in the embodiment involved in Figure 4b, and other related parts in the embodiment involved in Figure 4c, which will not be repeated here.

[0424] In some embodiments, step S4303 is omitted, and the second network device autonomously implements the function indicated by the first information, or the above function is default or by default.

[0425] Step S4403, obtain the eighth information.

[0426] The optional implementation method of step S4403 can refer to the optional implementation method of step S2105 in Figure 2, the optional implementation method of step S4105 in Figure 4a, the optional implementation method of step S4204 in Figure 4b, the optional implementation method of step S4304 in Figure 4c, and other related parts in the embodiment involved in Figure 2, other related parts in the embodiment involved in Figure 4a, other related parts in the embodiment involved in Figure 4b, and other related parts in the embodiment involved in Figure 4c, which will not be repeated here.

[0427] In some embodiments, step S4403 is omitted, and the second network device autonomously implements the function indicated by the eighth information, or the above function is default or by default.

[0428] Step S4404, sending the second information.

[0429] The optional implementation method of step S4404 can refer to the optional implementation method of step S2106 in Figure 2, the optional implementation method of step S4106 in Figure 4a, the optional implementation method of step S4205 in Figure 4b, the optional implementation method of step S4305 in Figure 4c, and other related parts in the embodiment involved in Figure 2, other related parts in the embodiment involved in Figure 4a, other related parts in the embodiment involved in Figure 4b, and other related parts in the embodiment involved in Figure 4c, which will not be repeated here.

[0430] Figure 4e is a flow chart of another random access method according to an exemplary embodiment. As shown in Figure 4e, the embodiment of the present disclosure relates to a random access method that can be executed on a second network device. The method includes:

[0431] Step S4501, obtain first information.

[0432] For the optional implementation of step S4501, please refer to the optional implementation of step S2104 in Figure 2, the optional implementation of step S4104 in Figure 4a, the optional implementation of step S4203 in Figure 4b, the optional implementation of step S4303 in Figure 4c, the optional implementation of step S4402 in Figure 4d, and other related parts in the embodiment involved in Figure 2, other related parts in the embodiment involved in Figure 4a, other related parts in the embodiment involved in Figure 4b, other related parts in the embodiment involved in Figure 4c, and other related parts in the embodiment involved in Figure 4d, which will not be repeated here.

[0433] In some embodiments, step S4501 is omitted, and the second network device autonomously implements the function indicated by the first information, or the above function is default or by default.

[0434] Step S4502, obtain the eighth information.

[0435] For the optional implementation of step S4502, please refer to the optional implementation of step S2105 in Figure 2, the optional implementation of step S4105 in Figure 4a, the optional implementation of step S4204 in Figure 4b, the optional implementation of step S4304 in Figure 4c, the optional implementation of step S4403 in Figure 4d, and other related parts in the embodiment involved in Figure 2, other related parts in the embodiment involved in Figure 4a, other related parts in the embodiment involved in Figure 4b, other related parts in the embodiment involved in Figure 4c, and other related parts in the embodiment involved in Figure 4d, which will not be repeated here.

[0436] In some embodiments, step S4403 is omitted, and the second network device autonomously implements the function indicated by the eighth information, or the above function is default or by default.

[0437] Step S4503, sending the second information.

[0438] For the optional implementation of step S4503, please refer to the optional implementation of step S2106 in Figure 2, the optional implementation of step S4106 in Figure 4a, the optional implementation of step S4205 in Figure 4b, the optional implementation of step S4305 in Figure 4c, the optional implementation of step S4404 in Figure 4d, and other related parts in the embodiment involved in Figure 2, other related parts in the embodiment involved in Figure 4a, other related parts in the embodiment involved in Figure 4b, other related parts in the embodiment involved in Figure 4c, and other related parts in the embodiment involved in Figure 4d, which will not be repeated here.

[0439] Figure 4f is a flow chart of another random access method according to an exemplary embodiment. As shown in Figure 4f, the embodiment of the present disclosure relates to a random access method that can be executed on a second network device. The method includes:

[0440] Step S4601, obtain first information.

[0441] For the optional implementation of step S4601, please refer to the optional implementation of step S2104 in Figure 2, the optional implementation of step S4104 in Figure 4a, the optional implementation of step S4203 in Figure 4b, the optional implementation of step S4303 in Figure 4c, the optional implementation of step S4402 in Figure 4d, the optional implementation of step S4501 in Figure 4e, and other related parts in the embodiment involved in Figure 2, other related parts in the embodiment involved in Figure 4a, other related parts in the embodiment involved in Figure 4b, other related parts in the embodiment involved in Figure 4c, other related parts in the embodiment involved in Figure 4d, and other related parts in the embodiment involved in Figure 4e, which will not be repeated here.

[0442] In some embodiments, step S4501 is omitted, and the second network device autonomously implements the function indicated by the first information, or the above function is default or by default.

[0443] Step S4602, sending the second information.

[0444] For the optional implementation of step S4602, please refer to the optional implementation of step S2106 in Figure 2, the optional implementation of step S4106 in Figure 4a, the optional implementation of step S4205 in Figure 4b, the optional implementation of step S4305 in Figure 4c, the optional implementation of step S4404 in Figure 4d, the optional implementation of step S4503 in Figure 4e, and other related parts in the embodiment involved in Figure 2, other related parts in the embodiment involved in Figure 4a, other related parts in the embodiment involved in Figure 4b, other related parts in the embodiment involved in Figure 4c, other related parts in the embodiment involved in Figure 4d, and other related parts in the embodiment involved in Figure 4e, which will not be repeated here.

[0445] FIG4g is a flow chart of another random access method according to an exemplary embodiment. As shown in FIG4g, the embodiment of the present disclosure relates to a random access method that can be executed on a second network device. The method includes:

[0446] Step S4701, sending the second information.

[0447] For the optional implementation of step S4701, please refer to the optional implementation of step S2106 in Figure 2, the optional implementation of step S4106 in Figure 4a, the optional implementation of step S4205 in Figure 4b, the optional implementation of step S4305 in Figure 4c, the optional implementation of step S4404 in Figure 4d, the optional implementation of step S4503 in Figure 4e, the optional implementation of step S4602 in Figure 4f, and other related parts in the embodiment involved in Figure 2, other related parts in the embodiment involved in Figure 4a, other related parts in the embodiment involved in Figure 4b, other related parts in the embodiment involved in Figure 4c, other related parts in the embodiment involved in Figure 4d, other related parts in the embodiment involved in Figure 4e, and other related parts in the embodiment involved in Figure 4f, which will not be repeated here.

[0448] In some embodiments, sending the second information includes: sending the second information within a first time window, wherein the first time window is determined based on the first time domain position and the first duration.

[0449] In some embodiments, the first duration is determined in at least one of the following ways: based on a first predefined rule, wherein the first predefined rule predefines the first duration; based on a network device configuration; based on a second duration and a third duration, wherein the second duration is the duration configured by the network device, and the third duration is determined by the network device configuration or based on the first predefined rule.

[0450] In some embodiments, the second information includes information indicating a system frame number.

[0451] In some embodiments, the first time domain position is determined by at least one of the following methods: based on a second predefined rule, wherein the second predefined rule predefines the first time domain position; based on the network device configuration; based on the second time domain position and a fourth duration, wherein the second time domain position is the end position of the random access transmission resource RO for sending the first information, and the fourth duration is used to indicate the time domain offset between the first time domain position and the second time domain position.

[0452] In some embodiments, the first time domain position is the first orthogonal frequency division multiplexing (OFDM) symbol after the second time domain position has passed through a fourth duration.

[0453] In some embodiments, the first time domain position is the first OFDM symbol of the control resource set CORESET corresponding to the type 1 common search space set for sending a physical downlink control channel, sent by the first network device or the second network device after the fourth duration of the second time domain position.

[0454] In some embodiments, the method further includes: sending third information, where the third information is used to instruct the terminal to send the first information to the first network device.

[0455] In some embodiments, the third information is also used to instruct the terminal to send the first information to the first network device based on the target RO; wherein, the target RO is determined by at least one of the following methods: determined based on the fourth information, the third information includes the fourth information, and the fourth information is used to indicate the target RO; determined based on the fourth information and the fifth information, the third information includes the fourth information and the fifth information, the fourth information is used to indicate multiple ROs, and the fifth information is used to indicate one RO among the multiple ROs as the target RO; determined based on the fourth information and the third predefined rule, the third information includes the fourth information, the fourth information is used to indicate multiple ROs, and the third predefined rule predefines the selection of one RO among the multiple ROs as the target RO.

[0456] In some embodiments, the target RO is determined based on the fourth information and the third predefined rule; the method further includes: receiving sixth information, where the sixth information is used to indicate the RO selected by the terminal.

[0457] In some embodiments, the method further includes: receiving seventh information, where the seventh information is used to indicate a downlink time difference between the first network device and the second network device.

[0458] In some embodiments, the second information is carried in at least one of the following ways: a defined Media Access Control Protocol Data Unit (MAC PDU) command; or a newly added Media Access Control Element (MAC CE) for carrying the second information.

[0459] In some embodiments, the second information includes at least one of the following parameters: a TA of the candidate cell; a cell identifier of the candidate cell; a logical identifier of the candidate cell; and a timing advance group TAG identifier of the candidate cell.

[0460] In some embodiments, the type 1 common search space set of the physical downlink control channel and its associated CORESET are resources of the first network device or resources of the second network device.

[0461] In some embodiments, sending the second information within the first time window includes: sending a physical downlink control channel PDCCH for scheduling physical downlink shared channel PDSCH resources within the first time window, wherein the PDSCH resources are used to send the second information.

[0462] FIG5 is a flow chart of another random access method according to an exemplary embodiment. As shown in FIG5 , the embodiment of the present disclosure relates to a random access method, which includes:

[0463] Step S5101: Terminal 101 sends first information to a first network device.

[0464] For the optional implementation of step S5101, please refer to the optional implementation of step S2104 in Figure 2, the optional implementation of step S4104 in Figure 4a, the optional implementation of step S4203 in Figure 4b, the optional implementation of step S4303 in Figure 4c, the optional implementation of step S4402 in Figure 4d, the optional implementation of step S4501 in Figure 4e, and other related parts in the embodiment involved in Figure 2, other related parts in the embodiment involved in Figure 4a, other related parts in the embodiment involved in Figure 4b, other related parts in the embodiment involved in Figure 4c, other related parts in the embodiment involved in Figure 4d, and other related parts in the embodiment involved in Figure 4e, which will not be repeated here.

[0465] Step S5102: The second network device sends second information to the terminal 101.

[0466] For the optional implementation of step S5102, please refer to the optional implementation of step S2106 in Figure 2, the optional implementation of step S4106 in Figure 4a, the optional implementation of step S4205 in Figure 4b, the optional implementation of step S4305 in Figure 4c, the optional implementation of step S4404 in Figure 4d, the optional implementation of step S4503 in Figure 4e, the optional implementation of step S4602 in Figure 4f, the optional implementation of step S4701 in Figure 4g, and other related parts in the embodiment involved in Figure 2, other related parts in the embodiment involved in Figure 4a, other related parts in the embodiment involved in Figure 4b, other related parts in the embodiment involved in Figure 4c, other related parts in the embodiment involved in Figure 4d, other related parts in the embodiment involved in Figure 4e, other related parts in the embodiment involved in Figure 4f, and other related parts in the embodiment involved in Figure 4g, which will not be repeated here.

[0467] Next, the present disclosure will describe the above solution with more detailed embodiments.

[0468] In some embodiments, the RO location is determined:

[0469] In some embodiments, for the asynchronous problem between different cells: the network implements the time difference by interaction between networks, or the user reports the time difference to the serving cell.

[0470] In some embodiments, RO selection: Even if the serving cell only has SSB and PRACH mask index, the RO available to the user may not be unique, and it is necessary to synchronize which RO is actually selected.

[0471] In some embodiments, Option 1: The protocol specifies that the selection of the RO is unique.

[0472] In some embodiments, Option 2: the serving cell indicates only one RO in the PDCCH order.

[0473] In some embodiments, Option 3: the user reports the selected RO to the serving cell.

[0474] In some embodiments, the determination of the RAR window:

[0475] Method 1: Extend the length of the window.

[0476] In some embodiments, the RAR window length is increased to include the inter-cell interaction time. Considering that the window length may exceed 10ms after increasing L, it is necessary to indicate the SFN (system frame number) information in the RAR to avoid RAR conflicts between RACHs of different SFNs.

[0477] Method 2: Modify the starting position of the RAR window.

[0478] In some embodiments, Case 1: the interval from RO to RAR window is increased by a fixed T, that is, the starting position of the RAR window is the first symbol of the earliest type 1 PDCCH after T time units after the end of RO; or more directly, because there is no need to receive the DCI of the target cell, the starting position of the RAR window is considered to be defined as the first symbol after T time units after RO.

[0479] In some embodiments, Case 2: defines an offset for the RAR window, where the offset is configured by the network.

[0480] Method 3: Modify the starting position and extend the window length.

[0481] In some embodiments, the starting position and length of the RAR can be configured by the network, and a starting position offset and a window duration or an additional length L can be configured. The specific starting position can be after the end of the offset or the first symbol of the earliest type 1 PDCCH after the end.

[0482] It is worth noting that, in the above method, when determining the specific starting position through type 1 PDCCH, considering that the RAR is received from the serving cell, the type 1 PDCCH may also be from the serving cell.

[0483] In some embodiments, RAR transmission mode: after receiving the TA value exchanged by the candidate cell, the serving cell schedules the PDSCH through the type 1 PDCCH in the RAR window.

[0484] In some embodiments, the transmission beam is: the transmission beam ordered by the PDCCH, or the transmission beam most recently indicated to the user.

[0485] In some embodiments, the RAR payload: still uses the MAC PDU in the random access process, which at least includes the TA value of the candidate cell, the cell ID / logical ID of the candidate cell, or the TAG ID; or defines a new MAC CE.

[0486] Figure 6a shows a possible first time window, where the first duration of the first time window is the sum of the second duration and the third duration. The second duration can be the duration of the default RAR window specified by the protocol, i.e., the RAR window shown in Figure 6a. The third duration, L, is used to compensate for the time required for interaction between different cells.

[0487] FIG6b shows a possible first time window, where the starting position of the RAR window may be the first OFDM symbol of the first type 1 PDCCH after the RO ends and after the time domain offset, wherein the time domain offset may be the T or offset mentioned above.

[0488] It can be seen that if the position after the RO ends and the time domain offset happens to be within a certain type 1 PDCCH opportunity, the next type 1 PDCCH after the type 1 PDCCH can be used as the first type 1 PDCCH.

[0489] Figure 6c shows a possible first time window, where the starting position of the RAR window can be the first OFDM symbol after the RO ends and after the time domain offset. The time domain offset can be the T or offset mentioned above. In this example, regardless of whether the position after the RO ends and after the time domain offset falls within a type 1 PDCCH opportunity, the first OFDM symbol after the RO ends and after the time domain offset can be used as the starting position of the RAR window.

[0490] 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.

[0491] The embodiments of the present disclosure also provide an apparatus for implementing any of the above methods. For example, a random access apparatus is provided, which includes units or modules for implementing each step performed by a terminal (e.g., a terminal) in any of the above methods. For another example, another random access apparatus is provided, which includes units or modules for implementing each step performed by a second network device (e.g., an access network device, a core network function node, a core network device, etc.) in any of the above methods.

[0492] 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.

[0493] In the embodiments of the present disclosure, the processor is a circuit with signal processing capabilities. In one implementation, the processor can be a circuit with instruction reading and execution capabilities, such as a central processing unit (CPU), a microprocessor, a graphics processing unit (GPU) (which can be understood as a microprocessor), or a digital signal processor (DSP). In another implementation, the processor can implement certain functions through the logical relationship of a hardware circuit. The logical relationship of the above-mentioned hardware circuit is fixed or reconfigurable. For example, the processor is a hardware circuit implemented by an application-specific integrated circuit (ASIC) or a programmable logic device (PLD), such as an FPGA. In a reconfigurable hardware circuit, the process of the processor loading a configuration document to implement the hardware circuit configuration can be understood as the process of the processor loading instructions to implement the functions of some or all of the above units or modules. In addition, it can also be a hardware circuit designed for artificial intelligence, which can be understood as ASIC, such as a neural network processing unit (NPU), a tensor processing unit (TPU), a deep learning processing unit (DPU), etc.

[0494] Figure 7a is a schematic diagram of a random access device according to an exemplary embodiment. As shown in Figure 7a, the random access device 7100 can be, for example, the terminal mentioned above, and the device 7100 includes: a transceiver module 7101. Of course, the device 7100 can also include any possible modules such as a processing module, which is not limited by this disclosure. In some embodiments, the transceiver module 7101 is used to send first information to the first network device. Optionally, the transceiver module 7101 is used to execute at least one of the communication steps S2101, S2102, S2103, S2104, and S2106 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.

[0495] Figure 7b is a schematic diagram of another random access device according to an exemplary embodiment. As shown in Figure 7b, the random access device 7200 can be, for example, the second network device mentioned above, and 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 by 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 S2101, S2102, S2103, S2104, S2105, and S2106 of sending and / or receiving performed by the second network device in any of the above methods, but is not limited to this and will not be repeated here.

[0496] 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.

[0497] 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.

[0498] 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.

[0499] 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, S2103, S2104, S2105, and S2106 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.

[0500] 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.

[0501] 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.

[0502] 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. 8a. The communication device may be an independent device or may be part of a larger device. For example, the communication device may be: 1) an independent integrated circuit IC, or a chip, or a chip system or subsystem; (2) a collection of one or more ICs, optionally, the above IC collection may also include a storage component for storing data or programs; (3) an ASIC, such as a modem; (4) a module that can be embedded in other devices; (5) a receiver, a terminal device, an intelligent terminal device, a cellular phone, a wireless device, a handheld device, a mobile unit, an in-vehicle device, a network device, a cloud device, an artificial intelligence device, etc.; (6) others, etc.

[0503] 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.

[0504] The chip 8200 includes one or more processors 8201 , and the chip 8200 is configured to execute any of the above methods.

[0505] 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.

[0506] In some embodiments, the interface circuit 8202 performs at least one of the steps S2101, S2102, S2103, S2104, S2105, and S2106 of the method for transmitting and / or receiving communications, but is not limited thereto. The processor 8201 performs other steps, but is not limited thereto.

[0507] In some embodiments, terms such as interface circuit, interface, transceiver pin, and transceiver may be used interchangeably.

[0508] 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.

[0509] 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.

[0510] 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.

[0511] 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.

[0512] The present disclosure proposes a RAR receiving method, which enables a terminal to smoothly receive the RAR from a serving cell to obtain the TA value of a candidate cell, thereby eliminating the need for uplink transmission during a cell switching process and reducing cell switching delay / interruption time.

Claims

1. A random access method, characterized in that: The method is executed by a terminal, and includes: Sending first information to a first network device, where the first information is used to determine a timing advance TA, where the TA is a TA corresponding to the first network device, and the first network device is a network device of a candidate cell; Receive second information sent by a second network device, where the second information is used to indicate the TA, and the second network device is a network device of a serving cell.

2. The method according to claim 1, characterized in that The receiving the second information sent by the second network device includes: The second information sent by the second network device is received within a first time window, wherein the first time window is determined based on a first time domain position and a first duration.

3. The method according to claim 2, characterized in that The first duration is determined by at least one of the following methods: Determining based on a first predefined rule, wherein the first predefined rule predefines the first duration; Based on network device configuration; The method is determined based on a second duration and a third duration, wherein the second duration is a duration configured by the network device, and the third duration is a duration configured by the network device or determined based on the first predefined rule.

4. The method according to claim 3, characterized in that The first duration is determined based on the second duration and the third duration; and the second information includes information for indicating a system frame number.

5. The method according to any one of claims 2 to 4, characterized in that: The first time domain position is determined by at least one of the following methods: Determining based on a second predefined rule, wherein the second predefined rule predefines the first time domain position; Based on network device configuration; Determined based on a second time domain position and a fourth duration, wherein the second time domain position is the end position of the random access transmission resource RO for sending the first information, and the fourth duration is used to indicate the time domain offset between the first time domain position and the second time domain position.

6. The method according to claim 5, characterized in that The first time domain position is determined based on the second time domain position and a fourth duration; the first time domain position is the first orthogonal frequency division multiplexing OFDM symbol after the second time domain position has passed through the fourth duration.

7. The method according to claim 5, characterized in that The first time domain position is determined based on the second time domain position and the fourth duration; the first time domain position is the first OFDM symbol of the control resource set CORESET corresponding to the type 1 common search space set of the physical downlink control channel of the first network device or the second network device received by the terminal after the second time domain position has passed the fourth duration.

8. The method according to any one of claims 1 to 7, characterized in that: The method further comprises: Receive third information sent by the second network device, where the third information is used to instruct to send the first information to the first network device.

9. The method according to claim 8, characterized in that The sending the first information to the first network device includes: Sending the first information to the first network device based on the target RO; The target RO is determined by at least one of the following methods: Determining based on fourth information, the third information includes the fourth information, and the fourth information is used to indicate the target RO; Determining based on the fourth information and the fifth information, the third information includes the fourth information and the fifth information, the fourth information is used to indicate a plurality of ROs, and the fifth information is used to indicate that one of the plurality of ROs is the target RO; It is determined based on the fourth information and a third predefined rule that the third information includes the fourth information, the fourth information is used to indicate a plurality of ROs, and the third predefined rule predefines selecting one of the plurality of ROs as the target RO.

10. The method according to claim 9, characterized in that The method further comprises: determining the target RO based on the fourth information and the third predefined rule; Send sixth information, where the sixth information is used to indicate the selected RO to the second network device.

11. The method according to any one of claims 1 to 10, characterized in that: The method further comprises: Send seventh information, where the seventh information is used to indicate a downlink time difference between the first network device and the second network device.

12. The method according to any one of claims 1 to 11, characterized in that: The second information is carried in at least one of the following ways: Defined Media Access Control Protocol Data Unit MAC PDU commands; A media access control unit MAC CE is newly added for carrying the second information.

13. The method according to any one of claims 1 to 12, characterized in that: The second information includes at least one of the following parameters: TA of the candidate cell; a cell identifier of the candidate cell; The logical identifier of the candidate cell; Timing advance group TAG identifier of the candidate cell.

14. The method according to claim 7, characterized in that The type 1 common search space set of the physical downlink control channel and its associated CORESET are resources of the first network device or resources of the second network device.

15. The method according to claim 7 or 14, characterized in that The receiving, within the first time window, second information sent by the second network device includes: A physical downlink control channel PDCCH for scheduling a physical downlink shared channel PDSCH resource is received within the first time window, wherein the PDSCH resource is used to send the second information.

16. A random access method, characterized in that: The method is performed by a second network device, and the method includes: Send second information, where the second information is used to indicate a timing advance TA, where the TA is determined by the first network device based on the first information, where the TA is the TA corresponding to the first network device, where the second network device is a network device of a serving cell, and where the first network device is a network device of a candidate cell.

17. The method according to claim 16, characterized in that The sending of the second information comprises: The second information is sent within a first time window, wherein the first time window is determined based on a first time domain position and a first duration.

18. The method according to claim 17, characterized in that The first duration is determined by at least one of the following methods: Determining based on a first predefined rule, wherein the first predefined rule predefines the first duration; Based on network device configuration; The method is determined based on a second duration and a third duration, wherein the second duration is a duration configured by the network device, and the third duration is a duration configured by the network device or determined based on the first predefined rule.

19. The method according to claim 18, characterized in that The second information includes information for indicating a system frame number.

20. The method according to any one of claims 17 to 19, characterized in that: The first time domain position is determined by at least one of the following methods: Determining based on a second predefined rule, wherein the second predefined rule predefines the first time domain position; Based on network device configuration; Determined based on a second time domain position and a fourth duration, wherein the second time domain position is the end position of the random access transmission resource RO for sending the first information, and the fourth duration is used to indicate the time domain offset between the first time domain position and the second time domain position.

21. The method according to claim 20, characterized in that The first time domain position is the first orthogonal frequency division multiplexing OFDM symbol after the second time domain position has passed through the fourth duration.

22. The method according to claim 20, characterized in that The first time domain position is the first OFDM symbol of the control resource set CORESET corresponding to the type 1 common search space set of the physical downlink control channel sent by the first network device or the second network device after the second time domain position has passed the fourth duration.

23. The method according to any one of claims 16 to 22, characterized in that: The method further comprises: Send third information, where the third information is used to instruct the terminal to send the first information to the first network device.

24. The method according to claim 23, characterized in that The third information is also used to instruct the terminal to send the first information to the first network device based on the target RO; The target RO is determined by at least one of the following methods: Determining based on fourth information, the third information includes the fourth information, and the fourth information is used to indicate the target RO; Determining based on the fourth information and the fifth information, the third information includes the fourth information and the fifth information, the fourth information is used to indicate a plurality of ROs, and the fifth information is used to indicate that one of the plurality of ROs is the target RO; It is determined based on the fourth information and a third predefined rule that the third information includes the fourth information, the fourth information is used to indicate a plurality of ROs, and the third predefined rule predefines selecting one of the plurality of ROs as the target RO.

25. The method according to claim 24, characterized in that The method further comprises: determining the target RO based on the fourth information and the third predefined rule; Sixth information is received, where the sixth information is used to indicate the RO selected by the terminal.

26. The method according to any one of claims 16 to 25, characterized in that: The method further comprises: Receive seventh information, where the seventh information is used to indicate a downlink time difference between the first network device and the second network device.

27. The method according to any one of claims 16 to 26, characterized in that: The second information is carried in at least one of the following ways: Defined Media Access Control Protocol Data Unit MAC PDU commands; A media access control unit MAC CE is newly added for carrying the second information.

28. The method according to any one of claims 16 to 27, characterized in that: The second information includes at least one of the following parameters: TA of the candidate cell; a cell identifier of the candidate cell; The logical identifier of the candidate cell; Timing advance group TAG identifier of the candidate cell.

29. The method according to claim 22, characterized in that The type 1 common search space set of the physical downlink control channel and its associated CORESET are resources of the first network device or resources of the second network device.

30. The method according to claim 22 or 29, characterized in that The sending the second information within the first time window includes: A physical downlink control channel PDCCH for scheduling a physical downlink shared channel PDSCH resource is sent within the first time window, wherein the PDSCH resource is used to send the second information.

31. A random access method, characterized in that: The method comprises: The terminal sends first information to the first network device, where the first information is used to determine a timing advance TA, where the TA is a TA corresponding to the first network device, and the first network device is a network device of a candidate cell; The second network device sends second information to the terminal, where the second information is used to indicate the TA, and the second network device is a network device of a serving cell; The terminal receives the second information sent by the second network device.

32. A terminal, characterized in that: include: Transceiver module; The transceiver module is used to send first information to the first network device, where the first information is used to determine the timing advance TA, where the TA is a TA corresponding to the first network device, and the first network device is a network device of the candidate cell; The transceiver module is further used to receive second information sent by a second network device, where the second information is used to indicate the TA, and the second network device is a network device of a serving cell.

33. A network device, characterized in that: include: Transceiver module; The transceiver module is used to send second information, where the second information is used to indicate a timing advance TA, where the TA is determined by the first network device based on the first information, where the TA is the TA corresponding to the first network device, where the second network device is a network device of a serving cell, and where the first network device is a network device of a candidate cell.

34. A terminal, characterized in that: include: one or more processors; The terminal is used to execute the random access method according to any one of claims 1 to 15.

35. A network device, characterized in that: include: one or more processors; The network device is used to execute the random access method described in any one of claims 16-30.

36. A communication system, characterized in that: The method comprises a terminal and a network device, wherein the terminal is configured to implement the random access method according to any one of claims 1 to 15, and the network device is configured to implement the random access method according to any one of claims 16 to 30.

37. A storage medium storing instructions, characterized in that: When the instruction is executed on a communication device, the communication device is enabled to perform the random access method according to any one of claims 1 to 15 or 16 to 30.

Images