Communication method, terminal, source node, target node, communication system and medium

Abstract

The embodiment of the invention relates to a communication method, a terminal, a source node, a target node, a communication system and a medium. The communication method can be applied to a terminal, and the method comprises: receiving random access configuration information associated with a first cell, the random access configuration information being determined by negotiation of a source node and a target node; thus, in the embodiments of the present disclosure, the terminal can obtain the timing advance in the random access configuration information, and send the random access signal according to the timing advance, thereby reducing switching delay.

Description

Communication method, terminal, source node, target node, communication system and medium TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of communication, and in particular to a communication method, a terminal, a source node, a target node, a communication system and a medium. BACKGROUND

[0002] In various types of cell handover procedures or cell group change procedures, since the terminal initiates a random access procedure in the target cell, the delay of the cell handover procedure or the cell group change procedure is increased. However, the current random access channel-less (RACH-less) handover procedure requires that the time advance (TA) of the target cell and the source cell be the same or equal to 0. For the case where the TA of the target cell and the source cell is not the same or not equal to 0, the terminal still initiates a random access procedure in the target cell, which increases the delay of the cell handover procedure or the cell group change procedure.

[0003] SUMMARY

[0004] For various types of cell handover procedures or cell group change procedures, it is necessary to consider how to reduce the handover delay of the terminal in the handover procedure.

[0005] Embodiments of the present disclosure provide a communication method, a terminal, a source node, a target node, a communication system and a medium, which can enable the terminal to obtain the time advance in the random access configuration information and send a random access signal according to the time advance, thereby reducing the handover delay.

[0006] According to a first aspect of embodiments of the present disclosure, a communication method applied to a terminal is provided, and the method includes: receiving random access configuration information associated with a first cell, the random access configuration information being determined by negotiation between a source node and a target node.

[0007] According to a second aspect of embodiments of the present disclosure, a communication method applied to a source node is provided, and the method includes: sending random access configuration information associated with a first cell, the random access configuration information being determined by negotiation between the source node and a target node.

[0008] According to a third aspect of embodiments of the present disclosure, a communication method applied to a target node is provided, and the method includes: receiving a second message sent by a source node, wherein the second message is a random access configuration request message; and sending a first message to the source node, wherein the first message is a response message of the second message, and the first message carries random access configuration information associated with a first cell, the random access configuration information being determined by negotiation between the source node and the target node.

[0009] According to a fourth aspect of the embodiments of the present disclosure, a communication apparatus is provided, which comprises a first transceiver configured to receive first cell associated random access configuration information.

[0010] According to a fifth aspect of the embodiments of the present disclosure, a communication apparatus is provided, which comprises a second transceiver configured to send first cell associated random access configuration information, the random access configuration information being determined by negotiation between a source node and a target node.

[0011] According to a sixth aspect of the embodiments of the present disclosure, a communication apparatus is provided, which comprises a third transceiver configured to receive a second message sent by a source node, wherein the second message is a random access configuration request message; the third transceiver is further configured to send a first message to the source node, wherein the first message is a response message of the second message, and the first message carries first cell associated random access configuration information, the random access configuration information being determined by negotiation between the source node and a target node.

[0012] According to a seventh aspect of the embodiments of the present disclosure, a terminal is provided. The terminal comprises at least one processor and a memory storing instructions. The instructions, when executed by the terminal, cause the terminal to implement the communication method according to the first aspect.

[0013] According to an eighth aspect of the embodiments of the present disclosure, a source node is provided. The source node comprises at least one processor and a memory storing instructions. The instructions, when executed by the source node, cause the source node to implement the communication method according to the second aspect.

[0014] According to a ninth aspect of the embodiments of the present disclosure, a target node is provided. The target node comprises at least one processor and a memory storing instructions. The instructions, when executed by the target node, cause the target node to implement the communication method according to the third aspect.

[0015] According to a tenth aspect of the embodiments of the present disclosure, a communication system is provided. The communication system comprises a terminal, a source node and a target node. The terminal is configured to implement the communication method according to the first aspect, the source node is configured to implement the communication method according to the second aspect, and the target node is configured to implement the communication method according to the third aspect.

[0016] According to an eleventh aspect of the embodiments of the present disclosure, a storage medium is provided, which stores instructions, when the instructions are run on a communication device, cause the communication device to execute the communication method according to the first aspect, the second aspect or the third aspect.

[0017] According to a twelfth aspect of the embodiments of the present disclosure, a computer program product is provided. The computer program product, when executed by a communication device, causes the communication device to perform the communication method according to the first aspect, the second aspect, or the third aspect.

[0018] According to a thirteenth aspect of the embodiments of the present disclosure, a computer program is provided. The computer program, when executed on a computer, causes the computer to perform the communication method according to the first aspect, the second aspect, or the third aspect.

[0019] According to a fourteenth aspect of the embodiments of the present disclosure, a chip or chip system is provided. The chip or chip system includes processing circuitry. The processing circuitry is configured to perform the communication method according to the first aspect, the second aspect, or the third aspect.

[0020] According to the embodiments of the present disclosure, the terminal obtains the timing advance in the random access configuration information by receiving the random access configuration information indicated by the first cell, and transmits the random access signal according to the timing advance, thereby reducing the handover delay.

[0021] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and do not constitute a limitation on the embodiments of the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following describes the drawings required for the embodiment description. The following drawings are only some embodiments of the present disclosure, and do not specifically limit the protection scope of the present disclosure.

[0023] FIG. 1 is a schematic diagram of an architecture of a communication system according to an embodiment of the present disclosure.

[0024] FIG. 2 is a schematic diagram of an interaction of a communication method according to an embodiment of the present disclosure.

[0025] FIG. 3A is a schematic diagram of a flow of a communication method performed at a terminal side according to an embodiment of the present disclosure.

[0026] FIG. 3B is a schematic diagram of a flow of a communication method performed at a source node side according to an embodiment of the present disclosure.

[0027] FIG. 3C is a schematic diagram of a flow of a communication method performed at a target node side according to an embodiment of the present disclosure.

[0028] FIG. 4A is another schematic diagram of a flow of a communication method performed at a terminal side according to an embodiment of the present disclosure.

[0029] FIG. 4B is another schematic diagram of a flow of a communication method performed at a source node side according to an embodiment of the present disclosure.

[0030] FIG. 5A is a structural schematic diagram of a communication apparatus according to an embodiment of the present disclosure.

[0031] FIG. 5B is a structural schematic diagram of a communication apparatus according to an embodiment of the present disclosure.

[0032] FIG. 5C is a structural schematic diagram of a communication apparatus according to an embodiment of the present disclosure.

[0033] FIG. 6A is a structural schematic diagram of a communication apparatus according to an embodiment of the present disclosure.

[0034] FIG. 6B is a structural schematic diagram of a chip according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0035] Embodiments of the present disclosure provide a communication method, a terminal, a source node, a target node, a communication system and a medium.

[0036] In a first aspect, embodiments of the present disclosure provide a communication method applied to a terminal, the method comprising: receiving random access configuration information associated with a first cell, the random access configuration information being determined by negotiation between a source node and a target node.

[0037] In embodiments of the present disclosure, the terminal can obtain a timing advance in the random access configuration information by receiving the random access configuration information indicating the random access configuration information associated with the first cell, and transmit a random access signal according to the timing advance, thereby reducing handover delay.

[0038] In some embodiments, the random access configuration information comprises the timing advance.

[0039] In some embodiments, the method further comprises: transmitting the random access signal in the first cell according to the random access configuration information.

[0040] In some embodiments, the random access signal is transmitted in the first cell when at least one of the following conditions is met: the first signaling is received; the random access configuration information is received; uplink timing of the first cell is unavailable.

[0041] In some embodiments, the method further comprises: determining a random access resource contained in the random access configuration information according to the first signaling; and transmitting the random access signal in the first cell according to the random access resource.

[0042] In some embodiments, determining the random access resource contained in the random access configuration information according to the first signaling comprises: determining identification information of the random access configuration information according to the first signaling; and determining the random access resource according to the identification information of the random access configuration information.

[0043] In some embodiments, the identification information is determined by one of: numbering the identification information of the random access configuration information and the identification information of the serving cell; numbering the identification information of the random access configuration information and the identification information of the secondary cell; numbering the identification information of the random access configuration information, the identification information of the serving cell, and the identification information of the candidate cell; numbering the identification information of the random access configuration information, the identification information of the serving cell, and the identification information of the candidate cell group; numbering the identification information of the random access configuration information, the identification information of the secondary cell, and the identification information of the candidate cell; and numbering the identification information of the random access configuration information, the identification information of the secondary cell, and the identification information of the candidate cell group.

[0044] In some embodiments, the method further comprises: in a case where a first trigger condition is met, sending a random access signal at the first cell, the first trigger condition being indicated by the random access configuration information.

[0045] In some embodiments, the uplink timing unavailability comprises an uplink timer timeout, a length of the uplink timer being determined according to the random access configuration information.

[0046] In some embodiments, the first cell comprises a serving cell and / or a non-serving cell, the non-serving cell having a different timing advance than the serving cell.

[0047] In some embodiments, the random access configuration information is sent in a first message, the first message being a response message of a second message sent by the target node to the source node, the second message being a random access configuration request message sent by the source node to the target node.

[0048] In some embodiments, the random access configuration information comprises at least one of: a random access resource configuration; a configuration of the first cell; a random access feedback reception configuration.

[0049] In some embodiments, the random access resource configuration comprises at least one of: frequency point information corresponding to the random access resource; frequency band information corresponding to the random access resource; subcarrier spacing corresponding to the random access resource; transmission power control configuration information corresponding to the random access resource; time domain resource configuration information of the random access; frequency domain resource configuration information of the random access; code domain resource configuration information of the random access.

[0050] In some embodiments, the configuration of the first cell comprises at least one of: a cell identity of the first cell; time domain configuration information of the first cell; frequency domain configuration information of the first cell; spatial domain configuration information of the first cell.

[0051] In some embodiments, the random access feedback receiving configuration comprises at least one of: physical control channel configuration information for receiving the random access feedback; and random access feedback receiving duration configuration information.

[0052] In a second aspect, the embodiments of the present disclosure provide a communication method applied to a source node, the method comprising: receiving first cell associated random access configuration information, the random access configuration information being determined by the source node and a target node.

[0053] In the embodiments of the present disclosure, the source node receives the first cell associated random access configuration information and sends the random access configuration information to the terminal, so that the terminal obtains the timing advance in the random access configuration information and sends the random access signal according to the timing advance, thereby reducing the handover delay.

[0054] In some embodiments, the random access configuration information comprises the timing advance.

[0055] In some embodiments, the random access configuration information is used for sending the random access signal in the first cell.

[0056] In some embodiments, sending the random access signal in the first cell needs to satisfy at least one of the following: receiving first signaling; receiving the random access configuration information; and uplink timing of the first cell being unavailable.

[0057] In some embodiments, the first signaling is used for determining random access resources contained in the random access configuration information; and the random access resources are used for sending the random access signal in the first cell.

[0058] In some embodiments, the first signaling is used for determining identification information of the random access configuration information; and the identification information of the random access configuration information is used for determining the random access resources.

[0059] In some embodiments, the identification information is determined by one of the following: numbering the identification information of the random access configuration information and identification information of a serving cell; numbering the identification information of the random access configuration information and identification information of a secondary cell; numbering the identification information of the random access configuration information, the identification information of the serving cell and identification information of a candidate cell; numbering the identification information of the random access configuration information, the identification information of the serving cell and identification information of a candidate cell group; numbering the identification information of the random access configuration information, the identification information of the secondary cell and the identification information of the candidate cell; and numbering the identification information of the random access configuration information, the identification information of the secondary cell and the identification information of the candidate cell group.

[0060] In some embodiments, the random access configuration information is used for transmitting the random access signal in the first cell in a case that a first trigger condition is met, and the first trigger condition is indicated by the random access configuration information.

[0061] In some embodiments, the uplink timing unavailability comprises an uplink timer timeout, and a length of the uplink timer is determined according to the random access configuration information.

[0062] In some embodiments, the first cell comprises a serving cell and / or a non-serving cell, and the non-serving cell has a different timing advance than the serving cell.

[0063] In some embodiments, the method further comprises: transmitting a second message to the target node, the second message being a random access configuration request message; and receiving a first message transmitted by the target node, the first message being a response message of the second message, and the random access configuration information being carried in the first message.

[0064] In some embodiments, the random access configuration information comprises at least one of: a random access resource configuration; a configuration of the first cell; and a random access feedback reception configuration.

[0065] In some embodiments, the random access resource configuration comprises at least one of: frequency point information corresponding to the random access resource; frequency band information corresponding to the random access resource; subcarrier spacing corresponding to the random access resource; transmission power control configuration information corresponding to the random access resource; time domain resource configuration information of the random access; frequency domain resource configuration information of the random access; and code domain resource configuration information of the random access.

[0066] In some embodiments, the configuration of the first cell comprises at least one of: a cell identity of the first cell; time domain configuration information of the first cell; frequency domain configuration information of the first cell; and spatial domain configuration information of the first cell.

[0067] In some embodiments, the random access feedback reception configuration comprises at least one of: physical control channel configuration information used for receiving the random access feedback; and random access feedback reception duration configuration information.

[0068] In a third aspect, the embodiments of the present disclosure provide a communication method applied to a target node, the method comprising: receiving a second message transmitted by a source node, wherein the second message is a random access configuration request message; and transmitting a first message to the source node, wherein the first message is a response message of the second message, and the random access configuration information associated with the first cell is carried in the first message, and the random access configuration information is determined by negotiation between the source node and the target node.

[0069] In the embodiments of the present disclosure, the timing advance in the random access configuration information can enable the terminal to send the random access signal according to the timing advance, thereby reducing the handover delay.

[0070] In some embodiments, the random access configuration information includes the timing advance.

[0071] In some embodiments, the random access configuration information is used for sending the random access signal in the first cell.

[0072] In some embodiments, at least one of the following needs to be met for sending the random access signal in the first cell: receiving the first signaling; receiving the random access configuration information; and the uplink timing of the first cell being unavailable.

[0073] In some embodiments, the first signaling is used to determine the random access resource included in the random access configuration information; and the random access resource is used for sending the random access signal in the first cell.

[0074] In some embodiments, the first signaling is used to determine the identification information of the random access configuration information; and the identification information of the random access configuration information is used to determine the random access resource.

[0075] In some embodiments, the identification information is determined by one of the following: numbering the identification information of the random access configuration information and the identification information of the serving cell; numbering the identification information of the random access configuration information and the identification information of the secondary cell; numbering the identification information of the random access configuration information, the identification information of the serving cell, and the identification information of the candidate cell; numbering the identification information of the random access configuration information, the identification information of the serving cell, and the identification information of the candidate cell group; numbering the identification information of the random access configuration information, the identification information of the secondary cell, and the identification information of the candidate cell; and numbering the identification information of the random access configuration information, the identification information of the secondary cell, and the identification information of the candidate cell group.

[0076] In some embodiments, the random access configuration information is used for sending the random access signal in the first cell when a first trigger condition is met, and the first trigger condition is indicated by the random access configuration information.

[0077] In some embodiments, the uplink timing being unavailable includes the uplink timer being timed out, and the length of the uplink timer is determined according to the random access configuration information.

[0078] In some embodiments, the first cell includes a serving cell and / or a non-serving cell, and the timing advance of the non-serving cell is different from that of the serving cell.

[0079] In some embodiments, the random access configuration information comprises at least one of: a random access resource configuration; a configuration of the first cell; a random access feedback receiving configuration.

[0080] In some embodiments, the random access resource configuration comprises at least one of: frequency point information corresponding to the random access resource; frequency band information corresponding to the random access resource; subcarrier spacing corresponding to the random access resource; transmit power control configuration information corresponding to the random access resource; time domain resource configuration information of the random access; frequency domain resource configuration information of the random access; code domain resource configuration information of the random access.

[0081] In some embodiments, the configuration of the first cell comprises at least one of: a cell identity of the first cell; time domain configuration information of the first cell; frequency domain configuration information of the first cell; spatial domain configuration information of the first cell.

[0082] In some embodiments, the random access feedback receiving configuration comprises at least one of: physical control channel configuration information for receiving the random access feedback; random access feedback receiving duration configuration information.

[0083] In a fourth aspect, the embodiments of the present disclosure provide a communication apparatus, comprising: a first transceiving module configured to receive random access configuration information associated with a first cell, the random access configuration information being determined by negotiation between a source node and a target node.

[0084] In some embodiments, the random access configuration information comprises a timing advance.

[0085] In some embodiments, the communication apparatus described above further comprises: a processing module configured to: transmit a random access signal in the first cell according to the random access configuration information.

[0086] In some embodiments, the random access signal is transmitted in the first cell when at least one of the following conditions is met: the first signaling is received; the random access configuration information is received; uplink timing of the first cell is unavailable.

[0087] In some embodiments, the processing module is further configured to: determine, according to the first signaling, a random access resource contained in the random access configuration information; and the processing module is further configured to: transmit the random access signal in the first cell according to the random access resource.

[0088] In some embodiments, the processing module is further configured to: determine, according to the first signaling, identification information of the random access configuration information; and determine the random access resource according to the identification information of the random access configuration information.

[0089] In some embodiments, the identification information is determined by one of: numbering the identification information of the random access configuration information and the identification information of the serving cell; numbering the identification information of the random access configuration information and the identification information of the secondary cell; numbering the identification information of the random access configuration information, the identification information of the serving cell and the identification information of the candidate cell; numbering the identification information of the random access configuration information, the identification information of the serving cell and the identification information of the candidate cell group; numbering the identification information of the random access configuration information, the identification information of the secondary cell and the identification information of the candidate cell; and numbering the identification information of the random access configuration information, the identification information of the secondary cell and the identification information of the candidate cell group.

[0090] In some embodiments, the processing module is further configured to: in case that the first trigger condition is met, send the random access signal in the first cell, the first trigger condition being indicated by the random access configuration information.

[0091] In some embodiments, the uplink timing unavailability comprises uplink timer timeout, and a length of the uplink timer is determined according to the random access configuration information.

[0092] In some embodiments, the first cell comprises a serving cell and / or a non-serving cell, and the non-serving cell has a different timing advance than the serving cell.

[0093] In some embodiments, the random access configuration information is sent in a first message, the first message being a response message of a second message sent by the target node to the source node, and the second message being a random access configuration request message sent by the source node to the target node.

[0094] In some embodiments, the random access configuration information comprises at least one of: random access resource configuration; configuration of the first cell; random access feedback reception configuration.

[0095] In some embodiments, the random access resource configuration comprises at least one of: frequency point information corresponding to the random access resource; frequency band information corresponding to the random access resource; subcarrier spacing corresponding to the random access resource; transmission power control configuration information corresponding to the random access resource; time domain resource configuration information of the random access; frequency domain resource configuration information of the random access; code domain resource configuration information of the random access.

[0096] In some embodiments, the configuration of the first cell comprises at least one of: cell identification of the first cell; time domain configuration information of the first cell; frequency domain configuration information of the first cell; spatial domain configuration information of the first cell.

[0097] In some embodiments, the random access feedback receiving configuration comprises at least one of: physical control channel configuration information for receiving the random access feedback; random access feedback receiving duration configuration information.

[0098] In a fifth aspect, the embodiments of the present disclosure provide a communication apparatus, comprising: a second transceiving module configured to send first cell associated random access configuration information, the random access configuration information being determined by negotiation between a source node and a target node.

[0099] In some embodiments, the random access configuration information comprises a timing advance.

[0100] In some embodiments, the random access configuration information is used for sending a random access signal in the first cell.

[0101] In some embodiments, sending the random access signal in the first cell needs to satisfy at least one of: receiving first signaling; receiving the random access configuration information; uplink timing of the first cell being unavailable.

[0102] In some embodiments, the first signaling is used to determine random access resources contained in the random access configuration information; the random access resources are used to send the random access signal in the first cell.

[0103] In some embodiments, the first signaling is used to determine identification information of the random access configuration information; the identification information of the random access configuration information is used to determine the random access resources.

[0104] In some embodiments, the identification information is determined by one of: numbering the identification information of the random access configuration information and identification information of a serving cell; numbering the identification information of the random access configuration information and identification information of a secondary cell; numbering the identification information of the random access configuration information, the identification information of the serving cell and identification information of a candidate cell; numbering the identification information of the random access configuration information, the identification information of the serving cell and identification information of a candidate cell group; numbering the identification information of the random access configuration information, the identification information of the secondary cell and identification information of a candidate cell; and numbering the identification information of the random access configuration information, the identification information of the secondary cell and identification information of a candidate cell group.

[0105] In some embodiments, the random access configuration information is used to send the random access signal in the first cell in a case where a first trigger condition is satisfied, the first trigger condition being indicated by the random access configuration information.

[0106] In some embodiments, the uplink timing being unavailable comprises an uplink timer being timed out, a length of the uplink timer being determined according to the random access configuration information.

[0107] In some embodiments, the first cell comprises a serving cell and / or a non-serving cell, and the non-serving cell is different from the serving cell in a timing advance.

[0108] In some embodiments, the second transceiver module is further configured to send a second message to the target node, the second message being a random access configuration request message; receive a first message sent by the target node, the first message being a response message of the second message, and the random access configuration information being sent in the first message.

[0109] In some embodiments, the random access configuration information comprises at least one of: random access resource configuration; configuration of the first cell; random access feedback reception configuration.

[0110] In some embodiments, the random access resource configuration comprises at least one of: frequency point information corresponding to the random access resource; frequency band information corresponding to the random access resource; subcarrier spacing corresponding to the random access resource; transmission power control configuration information corresponding to the random access resource; time domain resource configuration information of the random access; frequency domain resource configuration information of the random access; code domain resource configuration information of the random access.

[0111] In some embodiments, the configuration of the first cell comprises at least one of: cell identification of the first cell; time domain configuration information of the first cell; frequency domain configuration information of the first cell; spatial domain configuration information of the first cell.

[0112] In some embodiments, the random access feedback reception configuration comprises at least one of: physical control channel configuration information for receiving random access feedback; random access feedback reception duration configuration information.

[0113] In a sixth aspect, the embodiments of the present disclosure provide a communication device, comprising: a third transceiver module configured to receive a second message sent by a source node, wherein the second message is a random access configuration request message; and the third transceiver module is further configured to send a first message to the source node, wherein the first message is a response message of the second message, and the first message carries random access configuration information associated with a first cell, and the random access configuration information is determined by negotiation between the source node and the target node.

[0114] In some embodiments, the random access configuration information is used for sending a random access signal in the first cell.

[0115] In some embodiments, the random access configuration information comprises a timing advance.

[0116] In some embodiments, sending a random access signal in the first cell needs to satisfy at least one of the following: receiving a first signaling; receiving the random access configuration information; and uplink timing of the first cell being unavailable.

[0117] In some embodiments, the first signaling is used to determine random access resource contained in the random access configuration information; the random access resource is used to send a random access signal in the first cell.

[0118] In some embodiments, the first signaling is used to determine identification information of the random access configuration information; the identification information of the random access configuration information is used to determine the random access resource.

[0119] In some embodiments, the identification information is determined by one of the following: numbering the identification information of the random access configuration information and the identification information of the serving cell; numbering the identification information of the random access configuration information and the identification information of the secondary cell; numbering the identification information of the random access configuration information, the identification information of the serving cell and the identification information of the candidate cell; numbering the identification information of the random access configuration information, the identification information of the serving cell and the identification information of the candidate cell group; numbering the identification information of the random access configuration information, the identification information of the secondary cell and the identification information of the candidate cell; and numbering the identification information of the random access configuration information, the identification information of the secondary cell and the identification information of the candidate cell group.

[0120] In some embodiments, the random access configuration information is used to send a random access signal in the first cell when a first trigger condition is met, and the first trigger condition is indicated by the random access configuration information.

[0121] In some embodiments, the uplink timing being unavailable includes that an uplink timer is timed out, and a length of the uplink timer is determined according to the random access configuration information.

[0122] In some embodiments, the first cell includes a serving cell and / or a non-serving cell, and the non-serving cell has a different timing advance than the serving cell.

[0123] In some embodiments, the random access configuration information includes at least one of the following: random access resource configuration; configuration of the first cell; random access feedback reception configuration.

[0124] In some embodiments, the random access resource configuration includes at least one of the following: frequency point information corresponding to the random access resource; frequency band information corresponding to the random access resource; subcarrier spacing corresponding to the random access resource; transmission power control configuration information corresponding to the random access resource; time domain resource configuration information of the random access; frequency domain resource configuration information of the random access; code domain resource configuration information of the random access.

[0125] In some embodiments, the configuration of the first cell includes at least one of the following: cell identification of the first cell; time domain configuration information of the first cell; frequency domain configuration information of the first cell; spatial domain configuration information of the first cell.

[0126] In some embodiments, the random access feedback receiving configuration comprises at least one of: physical control channel configuration information for receiving the random access feedback; and random access feedback receiving duration configuration information.

[0127] In a seventh aspect, the embodiments of the present disclosure provide a terminal. The terminal comprises at least one processor and a memory storing instructions. The instructions, when executed by the terminal, cause the terminal to implement the communication method in the first aspect and possible implementation manners thereof.

[0128] In an eighth aspect, the embodiments of the present disclosure provide a source node. The source node comprises at least one processor and a memory storing instructions. The instructions, when executed by the source node, cause the source node to implement the communication method in the second aspect and possible implementation manners thereof.

[0129] In a ninth aspect, the embodiments of the present disclosure provide a target node. The target node comprises at least one processor and a memory storing instructions. The instructions, when executed by the target node, cause the target node to implement the communication method in the third aspect and possible implementation manners thereof.

[0130] In a tenth aspect, the embodiments of the present disclosure provide a communication system. The communication system comprises a terminal, a source node and a target node. The terminal is configured to implement the communication method in the first aspect and possible implementation manners thereof, the source node is configured to implement the communication method in the second aspect and possible implementation manners thereof, and the target node is configured to implement the communication method in the third aspect and possible implementation manners thereof.

[0131] In an eleventh aspect, the embodiments of the present disclosure provide a storage medium, which stores instructions. When the instructions are run on a communication device, the communication device implements the communication method in the first aspect, the second aspect, the third aspect and possible implementation manners thereof.

[0132] In a twelfth aspect, the embodiments of the present disclosure provide a computer program product. When the computer program product is executed by a communication device, the communication device implements the communication method in the first aspect, the second aspect, the third aspect and possible implementation manners thereof.

[0133] In a thirteenth aspect, the embodiments of the present disclosure provide a computer program. When the computer program is run on a computer, the computer implements the communication method in the first aspect, the second aspect, the third aspect and possible implementation manners thereof.

[0134] In a fourteenth aspect, the embodiments of the present disclosure provide a chip or chip system. The chip or chip system includes processing circuitry. The processing circuitry is configured to perform the communication method as described in the first aspect, the second aspect, the third aspect, and possible implementation manners thereof.

[0135] It can be understood that the terminal, the source node, the target node, the communication system, the storage medium, the computer program product, the computer program, the chip or the chip system are used to execute the method provided by the embodiments of the present disclosure. Therefore, the beneficial effects achieved by the terminal, the source node, the target node, the communication system, the storage medium, the computer program product, the computer program, the chip or the chip system can refer to the beneficial effects in the corresponding method, which will not be described here.

[0136] The embodiments of the present disclosure provide a communication method, a terminal, a source node, a target node, a communication system, and a medium. In some embodiments, the terms of the communication method, the information processing method, the information transmission method, and the method of indicating the timing advance can be replaced with each other. The terms of the terminal, the source node, the target node, the communication device, the information processing device, and the device of indicating the timing advance can be replaced with each other. The terms of the information processing system, the communication system, and the system of indicating the timing advance can be replaced with each other.

[0137] The embodiments of the present disclosure are not exhaustive, but only illustrate some embodiments, and are not specific limitations on the protection scope of the present disclosure. In the case of no contradiction, each step in an embodiment can be implemented as an independent embodiment, and the steps can be combined arbitrarily, for example, the scheme after removing some steps in an embodiment can also be implemented as an independent embodiment, and the order of the steps in an embodiment can be exchanged arbitrarily, in addition, the optional implementation manners in an embodiment can be combined arbitrarily; in addition, the embodiments can be combined arbitrarily, for example, the steps of different embodiments or part or all of the steps of different embodiments can be combined arbitrarily, an embodiment can be combined with the optional implementation manners of other embodiments.

[0138] In each embodiment of the present disclosure, the terms and / or descriptions between the embodiments are consistent if there is no special description and logical conflict, and can be referred to each other, and the technical features in different embodiments can be combined to form a new embodiment according to the logical relationship between them.

[0139] The terms used in the embodiments of the present disclosure are only for the purpose of describing specific embodiments, and not as a limitation on the present disclosure.

[0140] In the embodiments of the present disclosure, an element expressed in singular form, such as "a", "an", "the", "said", "the aforementioned", "the foregoing", "this", and the like, unless otherwise specified, can represent "one and only one", or can represent "one or more", "at least one", and the like. For example, in the case of using an article such as "a", "an", "the" in English, the noun after the article can be understood as a singular expression, or can be understood as a plural expression.

[0141] In the embodiments of the present disclosure, "plurality" refers to two or more.

[0142] In some embodiments, the terms "at least one of", "one or more", "a plurality of", "multiple", and the like can be replaced with each other.

[0143] In some embodiments, the description modes such as "at least one of A, B", "A and / or B", "A in one case and B in another case", "in response to a case A, in response to a case B", and the like can include the following technical solutions according to the case: in some embodiments, A is executed regardless of B; in some embodiments, B is executed regardless of A; in some embodiments, A and B are selectively executed from A and B; in some embodiments, A and B are executed (A and B are both executed). When there are more branches such as A, B, C, and the like, it is similar to the above.

[0144] In some embodiments, the description modes such as "A or B" and the like can include the following technical solutions according to the case: in some embodiments, A is executed regardless of B; in some embodiments, B is executed regardless of A; in some embodiments, A and B are selectively executed from A and B; when there are more branches such as A, B, C, and the like, it is similar to the above.

[0145] The prefixes "first," "second," etc., used in the embodiments of this disclosure are merely for distinguishing different descriptive objects and do not impose restrictions on the position, order, priority, quantity, or content of the descriptive objects. The description of the descriptive objects is found in the claims or the context of the embodiments, and the use of prefixes should not constitute unnecessary restrictions. For example, if the descriptive object is a "field," the ordinal numbers preceding "field" in "first field" and "second field" do not restrict the position or order of the "fields." "First" and "second" do not restrict whether the "fields" they modify are in the same message, nor do they restrict the order of "first field" and "second field." Similarly, if the descriptive object is a "level," the ordinal numbers preceding "level" in "first level" and "second level" do not restrict the priority between "levels." Furthermore, the number of descriptive objects is not limited by ordinal numbers and can be one or more. For example, in "first device," the number of "devices" can be one or more. Furthermore, the objects modified by different prefixes can be the same or different. For example, if the object being described is "device", then "first device" and "second device" can be the same device or different devices, and their types can be the same or different. Similarly, if the object being described is "information", then "first information" and "second information" can be the same information or different information, and their content can be the same or different.

[0146] In some embodiments, “including A,” “containing A,” “for indicating A,” and “carrying A” can be interpreted as directly carrying A or indirectly indicating A.

[0147] In some embodiments, "in response to...", "in response to determining...", "in the case of...", "when...", "when..."

[0148] Terms such as “when”, “if…”, and “if…” can be used interchangeably.

[0149] In some embodiments, the terms “greater than,” “greater than or equal to,” “not less than,” “more than,” “more than or equal to,” “not less than,” “higher than,” “higher than or equal to,” “not lower than,” and “above” can be used interchangeably, as can the terms “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”.

[0150] In some embodiments, an apparatus or the like can be interpreted as an entity, and can also be interpreted as virtual, and the name thereof is not limited to the name described in the embodiments. The terms "apparatus", "equipment", "device", "circuit", "network element", "node", "function", "unit", "section", "system", "network", "chip", "chip system", "entity", "subject" and the like can be replaced with each other.

[0151] In some embodiments, a "network" can be interpreted as an apparatus (for example, an access network device, a core network device, and the like) included in the network.

[0152] In some embodiments, the terms "network device", "access network device (AN device)", "radio access network device (RAN device)", "base station (BS)", "radio base station", "fixed station", "node", "access network node", "access point", "transmission point (TP)", "reception point (RP)", "transmission / reception point (TRP)", "panel", "antenna panel", "antenna array", "cell", "macro cell", "small cell", "femtocell", "picocell", "sector", "cell group", "serving cell", "carrier", "component carrier", "bandwidth part (BWP)" and the like can be replaced with each other.

[0153] In some embodiments, the terms "terminal," "terminal device," "user equipment" (UE), "user terminal," "mobile station" (MS), "mobile terminal" (MT), subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, and the like can be used interchangeably.

[0154] In some embodiments, an access network device, a core network device, a source node, a target node, or a network device can be replaced with a terminal. For example, the embodiments of the present disclosure can also be applied to a structure in which communication between an access network device, a core network device, a source node, a target node, or a network device and a terminal is replaced with communication between a plurality of terminals (e.g., device-to-device (D2D), vehicle-to-everything (V2X), etc.). In this case, the terminal can also be configured to have all or part of the functions of the access network device. In addition, the terms "uplink," "downlink," and the like can also be replaced with terms corresponding to inter-terminal communication (e.g., "side"). For example, an uplink channel, a downlink channel, and the like can be replaced with a side channel, and an uplink, a downlink, and the like can be replaced with a sidelink.

[0155] In some embodiments, a terminal can be replaced with an access network device, a core network device, a source node, a target node, or a network device. In this case, the access network device, the core network device, the source node, the target node, or the network device can also be configured to have all or part of the functions of the terminal.

[0156] In some embodiments, the data, information, etc. can be obtained in compliance with the laws and regulations of the country in which the location is situated.

[0157] In some embodiments, the data, information, etc. can be obtained after obtaining the consent of the user.

[0158] In addition, each element, each row, or each column in the table of the embodiments of the present disclosure can be implemented as an independent embodiment, and any combination of any element, any row, or any column can also be implemented as an independent embodiment.

[0159] FIG. 1 is a schematic diagram of an architecture of a communication system according to an embodiment of the present disclosure. As shown in FIG. 1, the communication system 100 includes a terminal 101 and a network device 102. The network device 102 can also be referred to as an access network device.

[0160] In some embodiments, the terminal 101 includes at least one of a mobile phone, a wearable device, an Internet of Things device, a car with communication function, a smart car, a Pad, a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical surgery, a wireless terminal device in smart grid, a wireless terminal device in transportation safety, a wireless terminal device in smart city, a wireless terminal device in smart home, etc., but is not limited thereto.

[0161] In some embodiments, the network device 102, for example, is a node or device that accesses a terminal to a wireless network, and the network device 102 can include at least one of an evolved NodeB (eNB), a next generation eNB (ng-eNB), a next generation NodeB (gNB), a node B (NB), a home node B (HNB), a home evolved node B (HeNB), a source node, a target node, 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, an access node in a Wi-Fi system, but is not limited thereto.

[0162] In some embodiments, the network device 102 can be composed of a central unit (CU) and a distributed unit (DU), wherein the CU can also be referred to as a control unit, and the CU-DU structure can split the protocol layers of the network device 102, and the functions of part of the protocol layers are controlled by the CU, and the functions of the remaining part or all of the protocol layers are distributed in the DU and controlled by the CU, but are not limited thereto.

[0163] In some embodiments, the CU and the DU can be centrally deployed in one network device, or can be distributedly deployed in multiple network devices.

[0164] In some embodiments, one network device 102 can include one CU and at least one DU. One CU can be connected with multiple DUs, and one DU can only be connected with one CU.

[0165] It can be understood that the communication system described in the embodiments of the present disclosure is for more clearly illustrating the technical solutions of the present disclosure, and does not constitute a limitation on the technical solutions proposed in the present disclosure. It can be known by those skilled in the art that, with the evolution of system architecture and the appearance of new business scenarios, the technical solutions proposed in the present disclosure are also applicable to similar technical problems.

[0166] The following embodiments of the present disclosure can be applied to the communication system 100 shown in FIG. 1, or part of the subjects, but are not limited thereto. The subjects shown in FIG. 1 are illustrative, and the communication system can include all or part of the subjects in FIG. 1, or other subjects other than those in FIG. 1. The number and form of each subject is arbitrary, each subject can be physical or virtual, the connection relationship between each subject is illustrative, each subject can not be connected or can be connected, and the connection can be in any manner, can be direct connection or indirect connection, can be wired connection or wireless connection.

[0167] 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-Wide Band (UWB), Bluetooth (Bluetooth (registered trademark)), Public Land Mobile Network (PLMN) network, Device-to-Device (D2D) system, Machine to Machine (M2M) system, Internet of Things (IoT) system, Vehicle-to-Everything (V2X), system using other communication methods, next-generation system expanded based thereon, and the like. In addition, a plurality of systems can be combined (for example, combination of LTE or LTE-A and 5G, and the like).

[0168] Hereinafter, terms related to the present disclosure are explained and interpreted.

[0169] I. Introduction to handover procedure

[0170] In a conventional cell handover procedure or cell group change procedure (e.g., primary secondary cell (PSCell) or primary cell (PCell) change), a source node sends a handover request message to a target node, and the target node sends a handover command to a terminal through the source node. After receiving the handover command, the terminal initiates a random access procedure in a target cell according to a random access configuration of the target cell (e.g., PSCell or PCell) in the handover command, thereby establishing an uplink synchronization relationship with the target cell and then being able to send uplink data.

[0171] II. Introduction to RACH-less handover

[0172] In a cell handover procedure or cell group change procedure, if a source cell is the same as a target cell, the target cell can reuse a TA value of the source cell. The network side can indicate the terminal to reuse the TA value of the source cell when accessing the target cell in the handover command, or, for a case where the target cell has a small coverage, indicate that the target cell TA = 0. In this way, the terminal can not initiate a random access procedure when accessing the target cell, thereby reducing the handover delay.

[0173] III. Introduction to dual connectivity (DC)

[0174] A UE can be configured with two cell groups at the same time, i.e., a master cell group (MCG) and a secondary cell group (SCG).

[0175] In some embodiments, the MCG can include at least one PCell and can also include one or more secondary cells (SCells). The SCG can include at least one PSCell and can also include one or more SCells.

[0176] In some embodiments, a network node for managing the MCG is a master node (MN), and a network node for managing the SCG is a secondary node (SN). The PCell and the PSCell can be collectively referred to as a special cell (SpCell).

[0177] IV. Introduction to dynamic cell (or cell group) change

[0178] In the 5G system, the network side can provide the terminal with multiple "candidate cells or cell groups". The network side can control the terminal to change in multiple "candidate cells or cell groups" through layer 1 (L1) (such as downlink control information (DCI)) or layer 2 (L2) (such as medium access control-control element (MAC-CE)) signaling, for example, changing the working cell or cell group from "candidate cell or cell group-1" to "candidate cell or cell group-2". Wherein, one serving cell or cell group can correspond to one or more "candidate cells or cell groups".

[0179] The above process can also be referred to as an L1 / L2 triggered mobility (LTM) handover process.

[0180] Five, introduce the source node and the target node

[0181] The source node can be a source base station, a base station to which a serving cell belongs, a serving base station, a serving node, etc. For example, for MCG change, the source node can be a source MN; for example, for SCG change, the source node can be a source SN.

[0182] The target node can be a target base station, a base station to which a target cell belongs, a target base station, etc. For example, for MCG change, the target node can be a target MN; for example, for SCG change, the target node can be a target SN.

[0183] For various types of cell handover processes or cell group change processes, since the terminal initiates a random access process in the target cell, it will increase the delay of the cell handover process or the cell group change process. And the current RACH-less handover process requires that the TA of the target cell and the TA of the source cell be the same or 0, so for the case where the TA of the target cell and the TA of the source cell are not the same or the TA is not 0, the terminal still needs to initiate a random access process in the target cell, and how to make the terminal reduce the handover delay in the handover process needs to be considered.

[0184] FIG. 2 is an interaction diagram of a communication method according to an embodiment of the present disclosure. As shown in FIG. 2, the present disclosure relates to a communication method, and the method includes steps S2101-S2104.

[0185] The following describes the communication process of the above communication method, taking the source node as a source base station and the target node as a target base station as an example. In the following steps, the source base station can perform the steps, or the steps can be performed by the base station to which the serving cell belongs, the serving base station, the serving node, etc. The target base station can perform the steps, or the steps can be performed by the base station to which the target cell belongs, the target base station, etc.

[0186] In step S2101, the source base station sends a second message.

[0187] In some embodiments, the target base station receives the second message. In some embodiments, the target base station can be one base station or multiple base stations.

[0188] In some embodiments, the source base station sends the second message to the target base station through an interface such as X2, Xn, etc.

[0189] In some embodiments, the second message is used to trigger random access configuration negotiation between the source base station and the target base station. In some embodiments, the second message is used to request the target base station to indicate the random access configuration information associated with the first cell. In some embodiments, the second message is used to request the target base station to send the first message. In an embodiment, the first message is used to indicate the random access configuration information associated with the first cell. In some embodiments, the random access configuration information is determined by negotiation between the source node and the target node.

[0190] In some embodiments, the first message is a response message, a feedback message, an acknowledgement message, etc. of the second message. In an example, the second message can be an X2 interface or Xn interface establishment request (X2 / Xn setup request) message, and the first message can be an X2 interface or Xn interface establishment response (X2 / Xn setup response) message. In an example, the second message can be a handover request (handover request) message, and the first message can be a handover request acknowledgement (handover request acknowledge) message. In an example, the second message can be an eNB / NG-RAN node configuration update message, and the first message can be an eNB / NG-RAN node configuration update acknowledgement message.

[0191] In some embodiments, the name of the second message is not limited, for example, it can be a configuration request message, a random access configuration request message, a request message, etc. In some embodiments, the name of the first message is not limited, for example, it can be a configuration response message, a random access configuration message, a configuration message, etc.

[0192] In some embodiments, the second message is also used to indicate the related information of the first cell. In this case, the fourth information is included in the second message, and the fourth information includes the related information of one or more first cells. In an example, the fourth information can include at least one of the cell information of the first cell, the measurement information of the first cell, and the terminal information of the terminal associated with the first cell. In an embodiment, the first cell can be a non-serving cell of the terminal. In an embodiment, the non-serving cell can be used for cell change and / or handover. In an embodiment, the first cell can be a cell under the target base station. In an embodiment, the serving cell of the terminal can be at least one serving cell corresponding to the configuration of the serving cell of the terminal, and the non-serving cell of the terminal can include other cells such as neighbor cells, candidate cells, etc. in addition to the serving cell. Based on this, the source base station can request the random access configuration information of the first cell from the target base station by sending the second message, so as to realize the negotiation of the random access configuration between the base stations, or also can be called to realize the synchronization of the random access configuration between the base stations. In an embodiment, the first cell can be a serving cell of the terminal. In an embodiment, the terminal can be instructed to send a random access signal on the SCG by the DCI of the MCG in the case of configuring the DC, and the terminal can obtain the uplink timing of the SCG, so as to reduce the uplink synchronization delay in the case of SCG activation and deactivation, and the SCG is still a serving cell.

[0193] In some embodiments, the cell information of the first cell can include at least one of the cell identifier of the first cell, the frequency point information of the first cell, and the frequency band information of the first cell. In an example, the cell identifier can be a physical cell identifier (PhysCellId). In an example, the frequency point information can include an absolute radio frequency channel number (ARFCN), an evolved universal terrestrial radio access absolute radio frequency channel number (EARFCN), etc. In an example, the frequency point information can be the center frequency of the frequency band. In an example, the frequency band information can be the band number.

[0194] In some embodiments, the measurement information of the first cell can comprise one or more measurement quantities of the first cell. In an example, the one or more measurement quantities can comprise at least one of: a reference signal received power (RSRP), a reference signal receiving quality (RSRQ), a signal-to-noise ratio, a signal-to-interference-and-noise ratio, a cell level, a signal quality, etc.

[0195] In some embodiments, the terminal associated with the first cell can be a terminal configured with the random access configuration associated with the first cell. In an embodiment, the terminal associated with the first cell can be a terminal requiring to access the first cell, the first cell being a candidate cell, a target cell, etc. of the terminal.

[0196] In some embodiments, the terminal information of the terminal associated with the first cell can be a terminal identifier of the terminal associated with the first cell. In an example, the terminal identifier can be a cell radio network temporary identifier (C-RNTI). In an example, the terminal identifier can be a UE ID.

[0197] In step S2102, the target base station transmits a first message.

[0198] In some embodiments, the source base station receives the first message.

[0199] In some embodiments, the target base station receives the first message transmitted by the source base station through an interface such as X2, Xn, etc.

[0200] In some embodiments, the first message can comprise first information. In an embodiment, the first information is used to indicate the random access configuration associated with the first cell.

[0201] In some embodiments, the name of the first information is not limited, for example, it can be configuration information, random access configuration information, etc. In an embodiment, the random access configuration information can comprise at least one of the third information, the fifth information, the sixth information and the seventh information.

[0202] In some embodiments, the third information can be used to indicate that the terminal transmits a random access signal in the first cell.

[0203] In some embodiments, the third information can be used to indicate a first trigger condition. In some embodiments, the first trigger condition is used for the terminal to transmit a random access signal in the first cell according to the random access configuration information indicated by the first information in a case where it is determined that the first trigger condition is met.

[0204] In some embodiments, the first trigger condition can be a trigger event of conditional handover. In some embodiments, in the case that the first trigger condition is a trigger event of conditional handover, the terminal performs conditional handover in the first cell according to the random access configuration information indicated by the first information if the first trigger condition is met.

[0205] In some embodiments, the name of the third information is not limited, for example, it can be indication information, information indicating the terminal to send a random access signal, etc.

[0206] In some embodiments, the fifth information can be used to indicate the random access resource configuration associated with the first cell. In some embodiments, the name of the fifth information is not limited, for example, it can be resource configuration information, random access resource configuration information, etc.

[0207] In some embodiments, the random access resource configuration can include at least one of frequency point information corresponding to the random access resource, frequency band information corresponding to the random access resource, subcarrier spacing corresponding to the random access resource, transmission power control configuration information corresponding to the random access resource, time domain resource configuration information of the random access, frequency domain resource configuration information of the random access, code domain resource configuration information of the random access, and timing advance (TA).

[0208] In an example, the frequency point information corresponding to the random access resource can include an ARFCN, a center frequency of a frequency band, and the like. In an example, the frequency band information corresponding to the random access resource can include a band number. In an example, the transmission power control configuration information corresponding to the random access resource can include at least one of a maximum transmission power (p-Max), a frequency band leakage requirement (additionalSpectrumEmission), a power ramping value (powerRampingStep), and an initial power (preambleReceivedTargetPower). In an example, the time domain resource configuration information of the random access can include a period of the time domain resource. In an example, the time domain resource configuration information of the random access can include a slot position. In an example, the time domain resource configuration information of the random access can include a symbol position. In an example, the frequency domain resource configuration information of the random access can include a starting position of the frequency domain resource. In an example, the starting position of the frequency domain resource can include a number of a starting physical resource block (PRB). In an example, the code domain resource configuration information of the random access can include an index of a preamble (preambleIndex). In an example, the code domain resource configuration information of the random access can include a preamble code root sequence (prach-RootSequenceIndex). In an example, the timing advance can be indicated by a timing advance offset. In an example, the timing advance offset can be n-TimingAdvanceOffset. The terminal can determine the timing advance by the timing advance offset to achieve uplink synchronization.

[0209] In some embodiments, after the terminal determines the timing advance by the timing advance offset, the terminal can terminate the random access procedure in the first cell according to the timing advance.

[0210] In some embodiments, the sixth information can be used to indicate the configuration of the first cell. In some embodiments, the configuration information of the first cell can include at least one of a cell identity of the first cell, time domain configuration information of the first cell, frequency domain configuration information of the first cell, and spatial domain configuration information of the first cell. In some embodiments, the name of the sixth information is not limited, for example, it can be cell configuration information corresponding to the random access resource, configuration information of the first cell, and the like.

[0211] In an embodiment, the configuration information of the first cell can comprise at least one of: a cell identity of the first cell, synchronization signal configuration information of the first cell, frequency point information of the first cell, frequency band information of the first cell, frequency band range configuration information of the first cell, subcarrier spacing of the first cell, and cyclic prefix (CP) length of an orthogonal frequency division multiplexing (OFDM) symbol of the first cell.

[0212] In an example, the cell identity of the first cell can be PhysCellId. In an example, the identity information of the first cell can be SCell identity (e.g., SCell Index). In an example, the identity information of the first cell can be cell group identity (e.g., MCG or SCG).

[0213] In some embodiments, the synchronization signal configuration information of the first cell can comprise at least one of: frequency point information of the synchronization signal, frequency band information of the synchronization signal, transmission period of the synchronization signal, and transmission time location of each period of the synchronization signal.

[0214] In an example, the frequency point information of the synchronization signal can be ARFCN, EARFCN, center frequency of a frequency band, etc. In an example, the frequency band information of the synchronization signal can be band number. In an example, the transmission time location of each period of the synchronization signal can be at least one of: subframe location, slot location, and symbol location. In an example, the frequency point information of the first cell can be ARFCN, EARFCN, center frequency of a frequency band, etc. In an example, the frequency band information of the first cell can be band number. In an example, the frequency band range configuration information of the first cell can be bandwidth part (BWP) configuration. In an example, the BWP configuration can comprise at least one of: frequency band range identity (e.g., BWP ID), frequency band range type (e.g., initial BWP), and frequency band bandwidth indication (e.g., 20MHz or 20 PRBs, etc.). In an example, the subcarrier spacing of the first cell can be 15 kilohertz (kHz).

[0215] In some embodiments, the seventh information can be used to indicate random access feedback reception configuration. In some embodiments, the name of the seventh information is not limited, for example, it can be random access feedback reception configuration information, feedback reception configuration information, etc.

[0216] In an embodiment, the random access feedback reception configuration information can comprise: physical control channel configuration information used for receiving random access feedback and / or random access feedback reception duration configuration information.

[0217] In some embodiments, the physical control channel configuration information for receiving the random access feedback can comprise time domain resource configuration information and / or frequency domain resource configuration information of the physical control channel. In an example, the frequency domain resource configuration information of the physical control channel can comprise at least one of a search space (searchSpace), a control resource set (CORESET), and the like.

[0218] In an example, the random access feedback reception duration configuration information can comprise a random access feedback reception duration after sending the random access signal, such as ra-ResponseWindow.

[0219] In some embodiments, one first cell can be associated with one or more random access configuration information. In an embodiment, in the case where a first cell is associated with multiple random access configuration information, the first information can further comprise an index of the multiple random access configuration information. In an example, different random access configuration information can be identified by different indexes.

[0220] In some embodiments, the first message can further comprise the fourth information described above. In an embodiment, the first message can further comprise terminal information of a terminal associated with the first cell.

[0221] In step S2103, the source base station sends the first information.

[0222] In some embodiments, the terminal receives the first information.

[0223] In some embodiments, the terminal can send a random access signal in the first cell according to the random access configuration information indicated by the first information.

[0224] In some embodiments, the source base station can send the first information to the terminal through, for example, RRC message, DCI, MAC-CE signaling, or other high layer signaling, which is not specifically limited in the embodiments of the present disclosure.

[0225] In an example, the first information can be contained in, for example, RRC connection configuration (RRCconnectionconfiguration) message, RRC connection reconfiguration (RRCconnectionreconfiguration) message, RRC connection complete (RRCconnectioncomplete) message, and the like.

[0226] In some embodiments, the source base station can indicate the first cell by a cell identity of the non-serving cell. In this case, the sixth information in the first information comprises the cell identity of the first cell. In some embodiments, the source base station can indicate the first cell by frequency domain configuration information of the first cell in the configuration information of the cell. In this case, the sixth information in the first information comprises the frequency domain configuration information of the first cell. In this case, the source base station does not distinguish the serving cell and the non-serving cell.

[0227] In step S2104, the terminal transmits a random access signal in the first cell according to the random access configuration information.

[0228] In some embodiments, after receiving the first information, the terminal can transmit a random access signal in the first cell according to the random access configuration information indicated by the first information. In some embodiments, after receiving the first information, the terminal can first determine the timing advance of the first cell according to the first information, and then transmit a random access signal in the first cell based on the timing advance. In this way, the terminal can access the first cell and directly transmit a random access signal on the first cell without performing part or all of the random access process, thereby reducing the access delay.

[0229] In some embodiments, the timing advance of the non-serving cell is different from that of the serving cell. In some embodiments, the timing advance of the non-serving cell can or can not be equal to that of the serving cell in value, which is not limited in the embodiments of the present disclosure. In some embodiments, the terminal can trigger step S2104 in different cases. In an embodiment, the above-mentioned different cases can be and are not limited to the following three cases:

[0230] Case 1: the terminal transmits a random access signal in the first cell according to the random access configuration information indicated by the first information in the case that the first trigger condition is met. In this case, step S2104 is triggered in the case that the first trigger condition is met.

[0231] In some embodiments, the first trigger condition is indicated by the third information in the random access configuration information.

[0232] Case 2: the terminal transmits a random access signal in the first cell in the case that the uplink timing is unavailable. In this case, step S2104 is triggered in the case that the uplink timing is unavailable.

[0233] In some embodiments, the uplink timing being unavailable can include the uplink timer being timed out.

[0234] In some embodiments, the length of the uplink timer can be determined according to the random access configuration information. In some embodiments, the length of the uplink timer can be determined according to the determination of the timing advance in the random access configuration information.

[0235] Case 3: The terminal, after receiving the first signaling (may also be referred to as physical control signaling), determines the random access resource contained in the random access configuration information according to the physical control signaling, and then transmits the random access signal in the first cell according to the random access resource. At this time, step S2104 is triggered in the case where the terminal receives the physical control signaling.

[0236] In some embodiments, for case 3, the terminal, after receiving the physical control signaling, determines the identification information of the random access configuration information according to the physical control signaling, then determines the random access resource according to the identification information of the random access configuration information, and finally transmits the random access signal in the first cell according to the random access resource.

[0237] In some embodiments, the terminal, after receiving the physical control signaling, can determine the identification information of the random access configuration information according to the second information included in the physical control signaling, then determine the random access resource contained in the random access configuration information according to the identification information of the random access configuration information, and finally transmit the random access signal in the first cell according to the random access resource.

[0238] In some embodiments, the physical control signaling is used to instruct the terminal to transmit the random access signal in the first cell after receiving the physical control signaling.

[0239] In some embodiments, the physical control signaling can be RRC signaling, MAC-CE signaling, DCI, physical downlink control channel (PDCCH) signaling, etc.

[0240] In some embodiments, the second information can be included in the physical control signaling.

[0241] In some embodiments, the second information can be used to indicate the identification information of the random access configuration information. In some embodiments, the second information can be determined by various methods. In an embodiment, the above-mentioned various methods can be, but are not limited to, the following six methods:

[0242] Method 1: Determine the second information by numbering the identification information of the random access configuration information and the identification information of the serving cell.

[0243] Method 2: Determine the second information by numbering the identification information of the random access configuration information and the identification information of the secondary cell.

[0244] Method 3: Determine the second information by numbering the identification information of the random access configuration information, the identification information of the serving cell, and the identification information of the candidate cell.

[0245] Method 4: The second information is determined by numbering the identification information of the random access configuration information and the identification information of the serving cell and the identification information of the candidate cell group.

[0246] Method 5: The second information is determined by numbering the identification information of the random access configuration information and the identification information of the secondary cell and the identification information of the candidate cell.

[0247] Method 6: The second information is determined by numbering the identification information of the random access configuration information and the identification information of the secondary cell and the identification information of the candidate cell group.

[0248] In some embodiments, in method 1, the identification information of the random access configuration information and the identification information of the serving cell can be numbered, and the identification information of the random access configuration information (also referred to as the index of the random access configuration information) can be specified by indicating the number in the physical control signaling. In an example, in method 1, the numbers can be sequentially numbered in the order of the serving cell first and then the random access configuration information, 4 bits in total, 16 numbers. Assuming that the terminal is configured with 8 serving cells (such as 8 serving cells in MCG), and the terminal is configured with 8 random access configuration information, [0, 7] of the 16 numbers are allocated to indicate the 8 serving cells, and [8, 15] of the 16 numbers are allocated to indicate the 8 random access configuration information.

[0249] In some embodiments, in method 2, the identification information of the random access configuration information and the identification information of the secondary cell can be numbered, and the identification information of the random access configuration information can be specified by indicating the number in the physical control signaling. In an example, in method 2, the numbers can be sequentially numbered in the order of the secondary cell first and then the random access configuration information, 4 bits in total, 16 numbers. Assuming that the terminal is configured with 8 secondary cells (such as 8 SCells in MCG), and the terminal is configured with 8 random access configuration information, [0, 7] of the 16 numbers are allocated to indicate the 8 secondary cells, and [8, 15] of the 16 numbers are allocated to indicate the 8 random access configuration information.

[0250] In some embodiments, in method 3, the identification information of the random access configuration information, the identification information of the serving cells, and the identification information of the candidate cells can be numbered, and the identification information of the random access configuration information can be specified by indicating the number in the physical control signaling. In an example, in method 3, the sequential numbering can be performed in the order of the serving cells first, the candidate cells second, and the random access configuration information last, 4 bits in total 16 numbers, assuming that the terminal is configured with 4 serving cells (such as 4 serving cells of MCG), 4 candidate cells, and 4 random access configuration information, [0, 3] of the 16 numbers are allocated for indicating the 4 serving cells, [4, 7] of the 16 numbers are allocated for indicating the 4 candidate cells, and [8, 12] of the 16 numbers are allocated for indicating the 4 random access configuration information. In an example, in method 3, the sequential numbering can be performed in the order of the serving cells first, the random access configuration information second, and the candidate cells last, 4 bits in total 16 numbers, the terminal is configured with 4 serving cells, 4 candidate cells, and 4 random access configuration information, [0, 3] of the 16 numbers are allocated for indicating the 4 serving cells, [4, 7] of the 16 numbers are allocated for indicating the 4 random access configuration information, and [8, 12] of the 16 numbers are allocated for indicating the 4 candidate cells.

[0251] In some embodiments, in method 4, the identification information of the random access configuration information, the identification information of the serving cells, and the identification information of the candidate cell groups can be numbered, and the identification information of the random access configuration information can be specified by indicating the number in the physical control signaling. In an example, in method 4, the sequential numbering can be performed in the order of the serving cells first, the candidate cell groups second, and the random access configuration information last, 4 bits in total 16 numbers, assuming that the terminal is configured with 4 serving cells (such as 4 serving cells of MCG), 4 candidate cell groups, and 4 random access configuration information, [0, 3] of the 16 numbers are allocated for indicating the 4 serving cells, [4, 7] of the 16 numbers are allocated for indicating the 4 candidate cell groups, and [8, 12] of the 16 numbers are allocated for indicating the 4 random access configuration information. In an example, in method 4, the sequential numbering can be performed in the order of the serving cells first, the random access configuration information second, and the candidate cell groups last, 4 bits in total 16 numbers, the terminal is configured with 4 serving cells, 4 candidate cell groups, and 4 random access configuration information, [0, 3] of the 16 numbers are allocated for indicating the 4 serving cells, [4, 7] of the 16 numbers are allocated for indicating the 4 random access configuration information, and [8, 12] of the 16 numbers are allocated for indicating the 4 candidate cell groups.

[0252] In some embodiments, in method 5, the identification information of the random access configuration information, the identification information of the secondary cell, and the identification information of the candidate cell can be numbered, and the identification information of the random access configuration information can be specified by indicating the number in the physical control signaling. In an example, in method 5, the numbers can be sequentially numbered in the order of secondary cell first, then candidate cell, and finally random access configuration information, 4 bits, a total of 16 numbers, assuming that the terminal is configured with 4 secondary cells (such as 4 SCells in MCG), 4 candidate cells, and 4 random access configuration information, [0, 3] of the 16 numbers are allocated for indicating 4 secondary cells, [4, 7] of the 16 numbers are allocated for indicating 4 candidate cells, and [8, 12] of the 16 numbers are allocated for indicating 4 random access configuration information. In an example, in method 5, the numbers can be sequentially numbered in the order of secondary cell first, then random access configuration information, and finally candidate cell, 4 bits, a total of 16 numbers, the terminal is configured with 4 secondary cells, 4 candidate cells, and 4 random access configuration information, [0, 3] of the 16 numbers are allocated for indicating 4 secondary cells, [4, 7] of the 16 numbers are allocated for indicating 4 random access configuration information, and [8, 12] of the 16 numbers are allocated for indicating 4 candidate cells.

[0253] In some embodiments, in method 6, the identification information of the random access configuration information, the identification information of the secondary cell, and the identification information of the candidate cell group can be numbered, and the identification information of the random access configuration information can be specified by indicating the number in the physical control signaling. In an example, in method 6, the numbers can be sequentially numbered in the order of secondary cell first, then candidate cell group, and finally random access configuration information, 4 bits, a total of 16 numbers, assuming that the terminal is configured with 4 secondary cells (such as 4 SCells in MCG), 4 candidate cell groups, and 4 random access configuration information, [0, 3] of the 16 numbers are allocated for indicating 4 secondary cells, [4, 7] of the 16 numbers are allocated for indicating 4 candidate cell groups, and [8, 12] of the 16 numbers are allocated for indicating 4 random access configuration information. In an example, in method 6, the numbers can be sequentially numbered in the order of secondary cell first, then random access configuration information, and finally candidate cell group, 4 bits, a total of 16 numbers, the terminal is configured with 4 secondary cells, 4 candidate cell groups, and 4 random access configuration information, [0, 3] of the 16 numbers are allocated for indicating 4 secondary cells, [4, 7] of the 16 numbers are allocated for indicating 4 random access configuration information, and [8, 12] of the 16 numbers are allocated for indicating 4 candidate cell groups.

[0254] In some embodiments, the identification information of the random access configuration information can be the configuration number of the random access configuration information.

[0255] In some embodiments, the terminal can determine the identification information of the random access configuration information according to the second information included in the physical control signaling after receiving the physical control signaling. After determining the identification information of the random access configuration information, the terminal can determine the random access resource included in the random access configuration information according to the identification information of the random access configuration information. Finally, the terminal transmits the random access signal according to the random access resource in the first cell.

[0256] The communication method related to the embodiments of the present disclosure can include at least one of steps S2101 to S2104. For example, step S2103 can be implemented as an independent embodiment. For example, step S2102 can be implemented as an independent embodiment. For example, a combination of step S2101 and step S2102 can be implemented as an independent embodiment. For example, a combination of step S2101, step S2102 and step S2103 can be implemented as an independent embodiment. For example, a combination of step S2103 and step S2104 can be implemented as an independent embodiment, but is not limited thereto.

[0257] In some embodiments, steps S2101, S2102, S2104 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0258] In some embodiments, steps S2101, S2103, S2104 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0259] In some embodiments, steps S2101, S2102, S2104 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0260] In some embodiments, step S2104 is optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0261] In some embodiments, steps S2101, S2102 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0262] In some embodiments, the names of information and the like are not limited to the names described in the embodiments, and terms such as "information", "message", "signal", "signaling", "report", "configuration", "indication", "instruction", "command", "channel", "parameter", "domain", "field", "symbol", "symbol", "codebook", "codeword", "code point", "bit", "data", "program", "chip", and the like can be replaced with each other.

[0263] In some embodiments, terms such as "carrying", "including", "containing", and the like can be replaced with each other.

[0264] In some embodiments, terms such as "first type of mobility", "second type of mobility", "first mobility", "second mobility", and the like can be replaced with each other, and terms such as "downlink", "physical downlink", and the like can be replaced with each other. Terms such as "side", "sidelink", "sidelink communication", "direct", "direct link", "direct communication", "direct link communication", and the like can be replaced with each other.

[0265] In some embodiments, "acquire", "obtain", "get", "receive", "transmit", "bidirectional transmission", "send and / or receive", and the like can be replaced with each other, and can be interpreted as receiving from other subjects, acquiring from protocols, acquiring from higher layers, obtaining by processing oneself, autonomously implementing, and the like.

[0266] In some embodiments, terms such as "send", "transmit", "report", "issue", "transmit", "request", "bidirectional transmission", "send and / or receive", and the like can be replaced with each other.

[0267] In some embodiments, the terms "certain", "preset", "pre-set", "set", "indicated", "any", "first", and the like can be replaced with each other, and "certain A", "preset A", "pre-set A", "set A", "indicated A", "any A", "first A" can be interpreted as A predetermined in a protocol or the like, or A obtained by setting, configuration, or indication, or a specific A, any A, or first A, but are not limited thereto.

[0268] In some embodiments, the determination or judgment can be performed by a value represented by 1 bit (0 or 1), or by a true or false value (Boolean value) represented by true or false, or by comparison of numerical values (for example, comparison with a predetermined value), but is not limited thereto.

[0269] FIG. 3A is a flow diagram of a method of performing communication on a terminal side according to an embodiment of the present disclosure. As shown in FIG. 3A, the embodiment of the present disclosure relates to a method of performing communication, applied to the terminal, and the method includes steps S3101 to S3102.

[0270] In step S3101, first information is acquired.

[0271] The optional implementation of step S3101 can be referred to the step S2103 in FIG. 2 and other associated parts in the embodiments related to FIG. 2, which will not be repeated here.

[0272] In step S3102, a random access signal is transmitted in the first cell according to the random access configuration information.

[0273] The optional implementation of step S3102 can be referred to the step S2104 in FIG. 2 and other associated parts in the embodiments related to FIG. 2, which will not be repeated here.

[0274] The method of performing communication according to the embodiments of the present disclosure can include at least one of steps S3101 to S3102. For example, step S3101 can be implemented as an independent embodiment. For example, the combination of step S3101 and step S3102 can be implemented as an independent embodiment, but is not limited thereto.

[0275] In some embodiments, step S3102 is optional, and one or more of the steps can be omitted or replaced in different embodiments.

[0276] FIG. 3B is a flow diagram illustrating a method for performing communication at a source node according to an embodiment of the present disclosure. As shown in FIG. 3B, the embodiment of the present disclosure relates to a method for performing communication, which is applied to the source node. The method includes steps S3201-S3203.

[0277] In step S3201, the second message is sent.

[0278] The optional implementation of step S3201 can be referred to the step S2101 in FIG. 2 and other associated parts in the embodiments related to FIG. 2, which will not be repeated here.

[0279] In step S3202, the first message is acquired.

[0280] The optional implementation of step S3202 can be referred to the step S2102 in FIG. 2 and other associated parts in the embodiments related to FIG. 2, which will not be repeated here.

[0281] In step S3203, the first information is sent.

[0282] The optional implementation of step S3203 can be referred to the step S2103 in FIG. 2 and other associated parts in the embodiments related to FIG. 2, which will not be repeated here.

[0283] The method for performing communication according to the embodiments of the present disclosure can include at least one of steps S3201-S3203. For example, step S3202 can be implemented as an independent embodiment. For example, step S3203 can be implemented as an independent embodiment. For example, step S3201 and step S3202 can be implemented as independent embodiments. For example, the combination of step S3201, step S3202 and step S3203 can be implemented as an independent embodiment, but is not limited thereto.

[0284] In some embodiments, steps S3201 and S3203 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0285] In some embodiments, steps S3201 and S3202 are optional, and one or more of these steps can be omitted or replaced in different embodiments.

[0286] FIG. 3C is a flow diagram illustrating a method for performing communication at a target node according to an embodiment of the present disclosure. As shown in FIG. 3B, the embodiment of the present disclosure relates to a method for performing communication, which is applied to the target node. The method includes steps S3301-S3302.

[0287] In step S3301, the second message is acquired.

[0288] The optional implementation of step S3301 can refer to step S2101 in FIG. 2 and other associated parts in the embodiments related to FIG. 2, and details are not described herein.

[0289] In step S3302, the first message is sent.

[0290] The optional implementation of step S3302 can refer to step S2102 in FIG. 2 and other associated parts in the embodiments related to FIG. 2, and details are not described herein.

[0291] FIG. 4A is a flow diagram of a method for performing communication on a terminal side according to an embodiment of the present disclosure. As shown in FIG. 4A, the embodiment of the present disclosure relates to a method for performing communication, which is applied to a terminal. The method includes step S4101.

[0292] In step S4101, the first information is acquired.

[0293] The optional implementation of step S4101 can refer to step S2103 in FIG. 2 and other associated parts in the embodiments related to FIG. 2, and details are not described herein.

[0294] FIG. 4B is a flow diagram of a method for performing communication on a source node side according to an embodiment of the present disclosure. As shown in FIG. 4B, the embodiment of the present disclosure relates to a method for performing communication, which is applied to a source node. The method includes step S4201.

[0295] In step S4201, the first information is acquired.

[0296] In some embodiments, the first information is carried in the first message and sent. In this case, acquiring the first information can be acquiring the first message.

[0297] The optional implementation of step S4201 can refer to step S2102 in FIG. 2 and other associated parts in the embodiments related to FIG. 2, and details are not described herein.

[0298] In the following, the technical solutions of the embodiments of the present disclosure are exemplarily described through specific embodiments.

[0299] In some embodiments, the network side provides the terminal side with the random access configuration information of the specified cell.

[0300] In some embodiments, the "specified cell" type includes any one of the following:

[0301] Non-serving cell: for example, the serving cell configuration of the terminal corresponds to multiple serving cells (such as serving cell), and other cells in addition to the serving cells);

[0302] Any cell: e.g., including serving cell or non-serving cell; or e.g., the network side can provide the random access configuration information corresponding to the "physical cell identity and frequency" by indicating the "physical cell identity and frequency", without limiting the "physical cell identity and frequency" belonging to serving cell or non-serving cell.

[0303] In some embodiments, the random access configuration information includes at least one of: random access resource configuration, cell configuration corresponding to random access resource, and random access feedback reception configuration.

[0304] In some embodiments, the "random access resource configuration" includes at least one of:

[0305] Frequency information corresponding to random access resource: e.g., ARFCN;

[0306] Frequency band information corresponding to random access resource: e.g., band number;

[0307] Subcarrier spacing corresponding to random access resource;

[0308] Transmission power control configuration corresponding to random access resource: e.g., maximum transmission power (p-Max), additional spectrum emission requirement (additionalSpectrumEmission), time domain resource configuration of random access signal (e.g., period, slot position, symbol position, etc.), or frequency domain resource configuration of random access signal (e.g., starting frequency position, starting physical resource block number;

[0309] Code domain resource configuration of random access signal: e.g., preamble number (preambleIndex) or preamble code root sequence (prach-RootSequenceIndex);

[0310] Uplink transmission timing offset of random access signal: e.g., n-TimingAdvanceOffset.

[0311] In some embodiments, the "cell configuration corresponding to random access resource" includes at least one of:

[0312] Cell identity information;

[0313] Synchronization signal configuration corresponding to cell: e.g., synchronous signal block (SSB) configuration;

[0314] Frequency information corresponding to cell: e.g., ARFCN;

[0315] Frequency band information corresponding to cell: e.g., band number;

[0316] Frequency band range configuration corresponding to the cell: e.g., BWP configuration;

[0317] Subcarrier spacing: e.g., 15 kHz;

[0318] CP length of OFDM symbol.

[0319] In some embodiments, the cell identification information can include at least one of:

[0320] Physical cell identity: e.g., PhysCellId;

[0321] Serving cell identity: e.g., serving cell Index;

[0322] SCell identity: e.g., SCell Index;

[0323] Cell group identity: e.g., MCG or SCG.

[0324] In some embodiments, the “downlink synchronization signal configuration corresponding to the cell” includes at least one of:

[0325] Frequency point information of synchronization signal: e.g., ARFCN;

[0326] Frequency band information of synchronization signal: e.g., band number;

[0327] Transmission period of synchronization signal;

[0328] Specific transmission time position of each period of synchronization signal: e.g., specific subframe, slot or symbol position.

[0329] In some embodiments, the “frequency band range configuration corresponding to the cell” can include any of:

[0330] Frequency band range identity: e.g., BWP ID;

[0331] Frequency band range type: e.g., initial BWP;

[0332] Frequency band bandwidth indication: e.g., 20 MHz; or 20 PRBs.

[0333] In some embodiments, the “random access feedback reception configuration” includes at least one of:

[0334] Physical control channel configuration for receiving random access feedback;

[0335] Random access feedback reception duration configuration: e.g., random access feedback reception duration (ra-ResponseWindow) after transmitting random access signal.

[0336] In some embodiments, the "physical control channel configuration for receiving random access feedback" includes a time domain resource configuration and / or a frequency domain resource configuration.

[0337] In some embodiments, the frequency domain resource configuration can include a search space or a CORESET.

[0338] In some embodiments, the network side can configure one or more random access configuration information of a specified cell. When the network side configures multiple random access configuration information of a specified cell, the multiple random access configuration information of a specified cell can be numbered, e.g., the "configuration number" corresponding to the random access configuration information of a specified cell.

[0339] In some embodiments, according to the random access configuration information of a specified cell, the terminal transmits a random access signal in the specified cell.

[0340] In some embodiments, the transmission trigger condition of the random access signal includes any one of the following:

[0341] Condition 1: Physical control signaling trigger: e.g., trigger by PDCCH indication (e.g., indicate the "configuration number" corresponding to the random access configuration information of a specified cell in PDCCH). Then the terminal triggers to transmit a random access signal after receiving the "physical control signaling".

[0342] In some embodiments, the random access trigger indication method of the physical control signaling for the specified cell includes any one of the following:

[0343] Method 1: The "configuration number" corresponding to the "random access configuration information of a specified cell" is numbered with the "service cell or SCell number", and the "configuration number" corresponding to the "random access configuration information of a specified cell" is indicated by indicating a specific number of bits in the physical control signaling.

[0344] In an example, according to the sequential numbering of "service cell or SCell" first and then "random access configuration information of a specified cell", 4 bits (bit) are 16 numbers in total, the terminal is configured with 8 service cells or SCells (e.g., 8 service cells or SCells in MCG), 8 "random access configuration information of a specified cell", [0, 7] of the 16 numbers are allocated to indicate 8 service cells or SCells, and [8, 15] of the 16 numbers are allocated to indicate 8 "random access configuration information of a specified cell".

[0345] Method 2: The "configuration number" corresponding to the "random access configuration information of the specified cell" is numbered together with the "serving cell or SCell number" and the "candidate cell or cell group number", and the "configuration number" corresponding to the "random access configuration information of the specified cell" is indicated by indicating a specific number in the physical control signaling.

[0346] In an example, the 4bit is numbered in the order of "serving cell or SCell", then "candidate cell or cell group number", and then "random access configuration information of the specified cell", 4 serving cells or SCells (such as 4 serving cells or SCells in MCG), 4 LTM "candidate cells or cell groups", and 4 "random access configuration information of the specified cell" are configured for the terminal, [0, 3] of the 16 numbers is allocated to indicate the 4 serving cells or SCells, [4, 7] of the 16 numbers is allocated to indicate the 4 "candidate cells or cell groups", and [8, 12] of the 16 numbers is allocated to indicate the 4 "random access configuration information of the specified cell".

[0347] In an example, the 4bit is numbered in the order of "serving cell (or SCell)", then "random access configuration information of the specified cell", and then "candidate cell (or cell group) number", 4 serving cells (or SCells) (such as 4 serving cells (or SCells) in MCG), 4 LTM "candidate cells (or cell groups)", and 4 "random access configuration information of the specified cell" are configured for the terminal, [0, 3] of the 16 numbers is allocated to indicate the 4 serving cells (or SCells), [4, 7] of the 16 numbers is allocated to indicate the 4 "random access configuration information of the specified cell", and [8, 12] of the 16 numbers is allocated to indicate the 4 "candidate cells (or cell groups)".

[0348] Condition 2: Triggered in the "random access configuration information of the specified cell". After receiving the "random access configuration information of the specified cell", the terminal triggers to send a random access signal.

[0349] Condition 3: Triggered when the uplink timing corresponding to the specified cell is unavailable.

[0350] In an example, after the terminal obtains the TA value information, the terminal starts an uplink timing timer (such as TAT) for the cell, and after the timer expires, the terminal considers that the uplink timing corresponding to the specified cell is unavailable. At this time, the terminal triggers to send a random access signal in the specified cell.

[0351] In some embodiments, the source node sends the "random access configuration request information" to the target node.

[0352] In some embodiments, the source node can comprise a source base station, such as, for an MCG change, the source base station can be a source MN; or such as, for an SCG change, the source base station can be a source SN.

[0353] In some embodiments, the target node can comprise a target base station, such as, for an MCG change, the target base station can be a target MN; or such as, for an SCG change, the target base station can be a target SN.

[0354] In some embodiments, the “random access configuration request information” comprises at least one of:

[0355] Cell information corresponding to the “random access configuration”;

[0356] Measurement information of the cell corresponding to the “random access configuration”, such as, RSRP or RSRQ;

[0357] Terminal information using the “random access configuration”, such as, terminal identification: C-RNTI or UE ID.

[0358] In some embodiments, the cell information corresponding to the “random access configuration” comprises at least one of:

[0359] Physical cell identification, such as, PhysCellId;

[0360] Frequency point information corresponding to the cell, such as, ARFCN;

[0361] Band information corresponding to the cell, such as, band number.

[0362] In some embodiments, the target node sends “random access configuration request response information” to the source node.

[0363] In some embodiments, the “random access configuration request response information” comprises “random access configuration information of specified cell”.

[0364] In some embodiments, the “random access configuration request response information” can further comprise terminal information corresponding to the “random access configuration information of specified cell”.

[0365] For example, the terminal information can comprise C-RNTI or UE ID.

[0366] The embodiments of the present disclosure further provide a device for implementing any of the above methods, for example, a device comprising units or modules for implementing the steps performed by the terminal in any of the above methods. For another example, another device is provided, comprising units or modules for implementing the steps performed by the source node in any of the above methods. For another example, another device is provided, comprising units or modules for implementing the steps performed by the target node in any of the above methods.

[0367] It should be understood that the division of each unit or module in the above device is only a logical function division, and all or part of the units or modules can be integrated into one physical entity or physically separated in actual implementation. In addition, the units or modules in the device can be implemented in the form of processor calling software: for example, the device comprises a processor connected with a memory, the memory stores instructions, and the processor calls the instructions stored in the memory to implement any of the above methods or to implement the functions of the units or modules of the device, wherein the processor is a general processor such as a central processing unit (CPU) or a microprocessor, and the memory is a memory in the device or a memory outside the device. Alternatively, the units or modules in the device can be implemented in the form of hardware circuit, and the functions of part or all of the units or modules can be implemented by the design of the hardware circuit, and the hardware circuit can be understood as one or more processors; for example, in one implementation, the hardware circuit is an application-specific integrated circuit (ASIC), and the functions of part or all of the units or modules are implemented by the design of the logical relationship of the elements in the circuit; for another example, in another implementation, the hardware circuit is a programmable logic device (PLD), and 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 a configuration file, so as to implement the functions of part or all of the units or modules. All units or modules of the above device can be implemented in the form of processor calling software, or all units or modules can be implemented in the form of hardware circuit, or part of the units or modules are implemented in the form of processor calling software, and the remaining part is implemented in the form of hardware circuit.

[0368] In embodiments of the present disclosure, the processor is a circuit with signal processing capability. In one implementation, the processor can be a circuit with instruction reading and running capability, such as a CPU, a microprocessor, a graphics processing unit (GPU) (which can also be understood as a microprocessor), a digital signal processor (DSP), or the like. In another implementation, the processor can implement certain functions through a logical relationship of hardware circuits, and the logical relationship of the hardware circuits is fixed or can be reconfigured. For example, the processor is an ASIC or a PLD implemented hardware circuit, such as an FPGA. In the reconfigurable hardware circuit, the processor loads a configuration document to implement the hardware circuit configuration. It can be understood that the processor loads instructions to implement the functions of the above part or all units or modules. In addition, it can also be a hardware circuit designed for artificial intelligence, which can be understood as an ASIC, such as a neural network processing unit (NPU), a tensor processing unit (TPU), a deep learning processing unit (DPU), and the like.

[0369] As shown in FIG. 5A, FIG. 5A is a structural schematic diagram of a communication apparatus provided by an embodiment of the present disclosure. The structure of the communication apparatus 5100 can be as shown in FIG. 5A. The communication apparatus 5100 can be a terminal. The communication apparatus 5100 includes at least one of a first transceiver module 5101, a processing module 5102, and the like. In some embodiments, the first transceiver module 5101 is configured to receive first cell associated random access configuration information.

[0370] In some embodiments, the first transceiver module 5101 described above is configured to perform at least one of the communication steps (for example, step S3101) of sending and / or receiving performed by the terminal in any of the above methods, and details are not described herein. In some embodiments, the processing module 5102 described above is configured to perform at least one of the other steps (for example, step 3102, but not limited to this) performed by the terminal in any of the above methods, and details are not described herein.

[0371] In some embodiments, the first transceiving module 5101 can include a transmitting module and / or a receiving module, which can be separate or integrated together. Alternatively, the first transceiving module 5101 can be replaced with a transceiver. In some embodiments, the processing module 5102 can be one module or include multiple sub-modules. Alternatively, the multiple sub-modules perform all or part of the steps required by the processing module 5102 to perform. Alternatively, the processing module 5102 can be replaced with a processor.

[0372] As shown in FIG. 5B, FIG. 5B is a structural schematic diagram of a communication apparatus according to an embodiment of the present disclosure. The structure of the communication apparatus 5200 can be as shown in FIG. 5B. The communication apparatus 5200 can be a source node. The communication apparatus 5200 includes a second transceiving module 5201. In some embodiments, the second transceiving module 5201 is configured to transmit first cell associated random access configuration information, which is determined by the source node and the target node.

[0373] In some embodiments, the second transceiving module 5201 is configured to perform at least one of the communication steps (e.g., steps S3201, S3202, S3203) of transmitting and / or receiving performed by the source node in any of the above methods, which will not be repeated here.

[0374] In some embodiments, the second transceiving module 5201 can include a transmitting module and / or a receiving module, which can be separate or integrated together. Alternatively, the second transceiving module 5201 can be replaced with a transceiver.

[0375] As shown in FIG. 5C, FIG. 5C is a structural schematic diagram of a communication apparatus according to an embodiment of the present disclosure. The structure of the communication apparatus 5200 can be as shown in FIG. 5C. The communication apparatus 5300 can be a target node. The communication apparatus 5300 includes a third transceiving module 5301. In some embodiments, the third transceiving module 5301 is configured to receive a second message transmitted by a source node, where the second message is a random access configuration request message; and transmit a first message to the source node, where the first message is a response message of the second message, and the first message carries first cell associated random access configuration information, which is determined by the source node and the target node.

[0376] In some embodiments, the third transceiving module 5301 is configured to perform at least one of the communication steps (e.g., steps S3301, S3302) of transmitting and / or receiving performed by the target node in any of the above methods, which will not be repeated here.

[0377] In some embodiments, the third transceiver module 5301 can include a sending module and / or a receiving module, which can be separate or integrated together. Optionally, the third transceiver module 5301 can be mutually replaced with a transceiver.

[0378] FIG. 6A is a structural schematic diagram of a communication device according to an embodiment of the present disclosure. The communication device 6100 can be a source node, a target node, a terminal (e.g., a user equipment, etc.), a chip, a chip system, or a processor supporting the communication device to implement any of the above methods, or a chip, a chip system, or a processor supporting the terminal to implement any of the above methods. The communication device 6100 can be used to implement the methods described in the above method embodiments, and specific implementation can be referred to the descriptions in the above method embodiments.

[0379] As shown in FIG. 6A, the communication device 6100 includes one or more processors 6101. The processor 6101 can be a general-purpose processor or a special-purpose processor, for example, a baseband processor or a central processing unit. The baseband processor can be used to process communication protocols and communication data, and the central processing unit can be used to control a network node (e.g., a base station, a baseband chip, a terminal device, a terminal device chip, a DU or a CU, etc.), execute a program, and process data of the program. Optionally, the communication device 6100 is configured to implement any of the above methods. Optionally, the one or more processors 6101 are configured to invoke instructions to cause the communication device 6100 to implement any of the above methods.

[0380] In some embodiments, the communication device 6100 further includes one or more transceivers 6102. When the communication device 6100 includes the one or more transceivers 6102, the transceiver 6102 performs at least one of the communication steps (e.g., steps S2101, S2102, S2103, but not limited to) in the above methods, and the processor 6101 performs at least one of the other steps (e.g., step S2104, but not limited to). In an optional embodiment, the transceiver can include a receiver and / or a transmitter, which can be separate or integrated together. Optionally, the terms of transceiver, transceiving unit, transceiver, transceiving circuit, interface circuit, interface, etc. can be mutually replaced, and the terms of transmitter, transmitting unit, transmitter, transmitting circuit, etc. can be mutually replaced, and the terms of receiver, receiving unit, receiver, receiving circuit, etc. can be mutually replaced.

[0381] In some embodiments, the communication device 6100 further includes one or more memories 6103 for storing data. Alternatively, all or part of the memories 6103 can be external to the communication device 6100. In optional embodiments, the communication device 6100 can include one or more interface circuits 6104. Optionally, the interface circuit 6104 is connected to the memory 6103, and the interface circuit 6104 can be used to receive data from the memory 6103 or other devices, and can be used to send data to the memory 6103 or other devices. For example, the interface circuit 6104 can read data stored in the memory 6103 and send the data to the processor 6101.

[0382] The communication device 6100 described in the above embodiments can be a source node, a target node, or a terminal, but the scope of the communication device 6100 described in the present disclosure is not limited thereto, and the structure of the communication device 6100 can not be limited by FIG. 6A. The communication device 6100 can be a standalone device or can be part of a larger device. For example, the communication device 6100 can be: (1) a standalone integrated circuit (IC), or a chip, or a chip system or subsystem; (2) a set of one or more ICs, which can optionally include a storage component for storing data, programs; (3) an ASIC, such as a modem; (4) a module that can be embedded in other devices; (5) a receiver, a terminal device, a smart terminal device, a cellular phone, a wireless device, a handset, a mobile unit, a vehicle-mounted device, a network device, a cloud device, an artificial intelligence device, and the like; (6) other devices, and the like.

[0383] FIG. 6B is a structural schematic diagram of a chip according to an embodiment of the present disclosure. For the case where the communication device 6100 is a chip or a chip system, the structure of the chip 6200 can be referred to the structural schematic diagram of the chip 6200 shown in FIG. 6B, but is not limited thereto.

[0384] The chip 6200 includes one or more processors 6201. The chip 6200 is configured to perform any of the above methods.

[0385] In some embodiments, the chip 6200 further includes one or more interface circuits 6202. Optionally, the terms interface circuit, interface, and transceiver pin can be replaced with each other. In some embodiments, the chip 6200 further includes one or more memories 6203 for storing data. Optionally, all or part of the memories 6203 can be external to the chip 6200. Optionally, the interface circuit 6202 is connected to the memory 6203, and the interface circuit 6202 can be used to receive data from the memory 6203 or other devices, and can be used to send data to the memory 6203 or other devices. For example, the interface circuit 6202 can read data stored in the memory 6203 and send the data to the processor 6201.

[0386] In some embodiments, the interface circuit 6202 performs at least one of the communication steps such as transmitting and / or receiving in the above method. The interface circuit 6202 performing the communication steps such as transmitting and / or receiving in the above method refers to, for example, the interface circuit 6202 performing data interaction between the processor 6201, the chip 6200, the memory 6203, or a transceiver device.

[0387] The modules and / or devices described in each of the embodiments of the virtual device, the physical device, the chip, etc. can be combined or separated according to actual conditions. Alternatively, part or all of the steps can also be executed by a plurality of modules and / or devices in cooperation, which is not limited here.

[0388] The embodiments of the present disclosure further provide a storage medium having instructions stored thereon, which, when executed on the communication device 6100, cause the communication device 6100 to perform any of the above methods. Alternatively, the storage medium is an electronic storage medium. Alternatively, the storage medium is a computer-readable storage medium, but is not limited to this, and it can also be a storage medium readable by other devices. Alternatively, the storage medium can be a non-transitory storage medium, but is not limited to this, and it can also be a transitory storage medium.

[0389] The embodiments of the present disclosure further provide a computer program product, which, when executed by the communication device 6100, causes the communication device 6100 to perform any of the above methods.

[0390] The embodiments of the present disclosure further provide a computer program, which, when executed on a computer, causes the computer to perform any of the above methods.

[0391] Other embodiments of the present disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the embodiments disclosed herein. The present disclosure is intended to cover any variations, uses or adaptations of the present disclosure following, in general, the principles of the present disclosure and including such features that are evident to those skilled in the art or are known in the art and can be used in the practice of the present disclosure. The specification and examples are to be regarded as exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0392] It should be understood that the present disclosure is not limited to the precise structures herein described and illustrated above and that various modifications and changes in the embodiments can be made by those skilled in the art without departing from the scope of the present disclosure. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A communication method, performed by a terminal, the method comprising: receiving first cell-associated random access configuration information, the random access configuration information being determined by negotiation between a source node and a target node.

2. The method of claim 1, wherein, The random access configuration information comprises a timing advance.

3. The method of claim 1 or 2, wherein, The method further comprises: transmitting a random access signal in the first cell according to the random access configuration information.

4. The method of claim 3, wherein, transmitting a random access signal in the first cell in the case that at least one of the following conditions is met: receiving a first signaling; receiving the random access configuration information; uplink timing of the first cell is unavailable.

5. The method of claim 4, wherein, The method further comprises: determining a random access resource contained in the random access configuration information according to the first signaling; transmitting a random access signal in the first cell according to the random access resource. 6.The method of claim 5, wherein the determining a random access resource contained in the random access configuration information according to the first signaling comprises: determining identification information of the random access configuration information according to the first signaling; determining the random access resource according to the identification information of the random access configuration information.

7. The method of claim 6, wherein, The identification information is determined by one of the following: numbering the identification information of the random access configuration information and identification information of a serving cell; numbering the identification information of the random access configuration information and identification information of a secondary cell; numbering the identification information of the random access configuration information, identification information of a serving cell, and identification information of a candidate cell; numbering the identification information of the random access configuration information, identification information of a serving cell, and identification information of a candidate cell group; numbering the identification information of the random access configuration information, identification information of a secondary cell, and identification information of a candidate cell; numbering the identification information of the random access configuration information, identification information of a secondary cell, and identification information of a candidate cell group.

8. The method according to any one of claims 4 to 7, wherein, The method further comprises: transmitting a random access signal in the first cell in the case that a first triggering condition is met, the first triggering condition being indicated by the random access configuration information.

9. The method according to any one of claims 4 to 8, wherein, The uplink timing being unavailable comprises an uplink timer being timed out, a length of the uplink timer being determined according to the random access configuration information.

10. The method according to any one of claims 1 to 9, wherein, The first cell comprises a serving cell and / or a non-serving cell, the non-serving cell having a different timing advance from the serving cell.

11. The method according to any one of claims 1 to 10, wherein, The random access configuration information is transmitted in a first message, the first message being a response message of a second message transmitted by the target node to the source node, the second message being a random access configuration request message transmitted by the source node to the target node.

12. The method according to any one of claims 1 to 11, wherein, The random access configuration information comprises at least one of the following: random access resource configuration; configuration of the first cell; random access feedback reception configuration.

13. The method of claim 12, wherein, The random access resource configuration comprises at least one of the following: frequency point information corresponding to the random access resource; frequency band information corresponding to the random access resource; subcarrier spacing corresponding to the random access resource; transmit power control configuration information corresponding to the random access resource; time domain resource configuration information of random access; frequency domain resource configuration information of random access; Code domain resource configuration information of random access.

14. The method of claim 12 or 13, wherein, The configuration of the first cell comprises at least one of: a cell identity of the first cell; time domain configuration information of the first cell; frequency domain configuration information of the first cell; space domain configuration information of the first cell.

15. The method according to any one of claims 12 to 14, wherein, The random access feedback reception configuration comprises at least one of: physical control channel configuration information for receiving random access feedback; random access feedback reception duration configuration information. 16.A communication method performed by a source node, the method comprising: sending first cell associated random access configuration information, the random access configuration information being determined by the source node and a target node in negotiation.

17. The method of claim 16, wherein, The random access configuration information comprises a timing advance.

18. The method of claim 16 or 17, wherein, The random access configuration information is used for sending a random access signal in the first cell.

19. The method of claim 18, wherein, The sending of the random access signal in the first cell needs to satisfy at least one of: receiving a first signaling; receiving the random access configuration information; uplink timing of the first cell being unavailable.

20. The method of claim 19, wherein, The first signaling is used for determining random access resources contained in the random access configuration information; the random access resources are used for sending a random access signal in the first cell.

21. The method of claim 20, wherein, The first signaling is used for determining identification information of the random access configuration information; the identification information of the random access configuration information is used for determining the random access resources.

22. The method of claim 21, wherein, The identification information is determined by one of: numbering the identification information of the random access configuration information and the identification information of a serving cell; numbering the identification information of the random access configuration information and the identification information of a secondary cell; numbering the identification information of the random access configuration information, the identification information of the serving cell and the identification information of a candidate cell; numbering the identification information of the random access configuration information, the identification information of the serving cell and the identification information of a candidate cell group; numbering the identification information of the random access configuration information, the identification information of the secondary cell and the identification information of a candidate cell; numbering the identification information of the random access configuration information, the identification information of the secondary cell and the identification information of a candidate cell group.

23. The method according to any one of claims 19 to 22, wherein, The random access configuration information is used for sending a random access signal in the first cell in the case that a first triggering condition is satisfied, the first triggering condition being indicated by the random access configuration information.

24. The method of claims 19-23, wherein, The uplink timing being unavailable comprises uplink timer timeout, a length of the uplink timer being determined according to the random access configuration information.

25. The method of any one of claims 16 to 24, wherein, The first cell comprises a serving cell and / or a non-serving cell, the non-serving cell having a different timing advance from the serving cell.

26. The method of any one of claims 16 to 25, wherein, The method further comprises: sending a second message to the target node, the second message being a random access configuration request message; receiving a first message sent by the target node, the first message being a response message of the second message, the random access configuration information being sent in the first message.

27. The method of any one of claims 16 to 26, wherein, The random access configuration information comprises at least one of: random access resource configuration; configuration of the first cell; random access feedback reception configuration.

28. The method of claim 27, wherein, The random access resource configuration comprises at least one of the following: Frequency point information corresponding to the random access resource; Frequency band information corresponding to the random access resource; Subcarrier spacing corresponding to the random access resource; Transmission power control configuration information corresponding to the random access resource; Time domain resource configuration information of the random access; Frequency domain resource configuration information of the random access; Code domain resource configuration information of the random access.

29. The method of claim 27 or 28, wherein, The configuration of the first cell comprises at least one of the following: Cell identification of the first cell; Time domain configuration information of the first cell; Frequency domain configuration information of the first cell; Space domain configuration information of the first cell.

30. The method of any one of claims 27 to 29, wherein, The random access feedback reception configuration comprises at least one of the following: Physical control channel configuration information for receiving the random access feedback; Random access feedback reception duration configuration information.

31. A communication method, performed by a target node, the method comprising: receiving a second message sent by a source node, wherein the second message is a random access configuration request message; sending a first message to the source node, wherein the first message is a response message of the second message, and the first message carries random access configuration information associated with a first cell, the random access configuration information being determined by negotiation between the source node and the target node.

32. The method of claim 31, wherein, The random access configuration information comprises a timing advance.

33. The method of claim 31 or 32, wherein, The random access configuration information is used for sending a random access signal in the first cell.

34. The method of claim 33, wherein, The sending of the random access signal in the first cell needs to satisfy at least one of the following: receiving a first signaling; receiving the random access configuration information; The uplink timing of the first cell is unavailable.

35. The method of claim 34, wherein, The first signaling is used to determine random access resources contained in the random access configuration information; the random access resources are used to send a random access signal in the first cell.

36. The method of claim 35, wherein, The first signaling is used to determine identification information of the random access configuration information; the identification information of the random access configuration information is used to determine the random access resources.

37. The method of claim 36, wherein, The identification information is determined by one of the following: numbering the identification information of the random access configuration information and the identification information of a serving cell; numbering the identification information of the random access configuration information and the identification information of a secondary cell; numbering the identification information of the random access configuration information, the identification information of the serving cell, and the identification information of a candidate cell; numbering the identification information of the random access configuration information, the identification information of the serving cell, and the identification information of a candidate cell group; numbering the identification information of the random access configuration information, the identification information of the secondary cell, and the identification information of a candidate cell; numbering the identification information of the random access configuration information, the identification information of the secondary cell, and the identification information of a candidate cell group.

38. The method of any one of claims 34 to 37, wherein, The random access configuration information is used to send a random access signal in the first cell under the condition that a first trigger condition is met, and the first trigger condition is indicated by the random access configuration information.

39. The method of claims 34-38, wherein, The uplink timing being unavailable comprises that an uplink timer is timed out, and the length of the uplink timer is determined according to the random access configuration information.

40. The method of any one of claims 31 to 39, wherein, The first cell comprises a serving cell and / or a non-serving cell, and the non-serving cell is different from the serving cell in terms of timing advance.

41. The method of any one of claims 31 to 40, wherein, The random access configuration information comprises at least one of the following: Random access resource configuration; Configuration of the first cell; Random access feedback reception configuration.

42. The method of claim 41, wherein, The random access resource configuration comprises at least one of the following: Frequency point information corresponding to the random access resource; Frequency band information corresponding to the random access resource; Subcarrier spacing corresponding to the random access resource; Transmission power control configuration information corresponding to the random access resource; Time domain resource configuration information of the random access; Frequency domain resource configuration information of the random access; Code domain resource configuration information of the random access.

43. The method of claim 41 or 42, wherein, The configuration of the first cell comprises at least one of the following: Cell identity of the first cell; Time domain configuration information of the first cell; Frequency domain configuration information of the first cell; Space domain configuration information of the first cell.

44. The method of any one of claims 41 to 43, wherein, The random access feedback reception configuration comprises at least one of the following: Physical control channel configuration information for receiving random access feedback; Random access feedback reception duration configuration information. 45.A communication apparatus comprising: a first transceiver module configured to receive random access configuration information associated with a first cell, the random access configuration information being determined by negotiation between a source node and a target node. 46.A communication apparatus comprising: a second transceiver module configured to send random access configuration information associated with a first cell, the random access configuration information being determined by negotiation between a source node and a target node. 47.A communication apparatus comprising: a third transceiver module configured to receive a second message sent by a source node, wherein the second message is a random access configuration request message; the third transceiver module is further configured to send a first message to the source node, wherein the first message is a response message of the second message, and the first message carries random access configuration information associated with a first cell, the random access configuration information being determined by negotiation between the source node and the target node. 48.A terminal comprising: at least one processor; a memory storing instructions; wherein the instructions, when executed by the terminal, cause the terminal to implement the communication method according to any one of claims 1 to 15. 49.A source node comprising: at least one processor; a memory storing instructions; wherein the instructions, when executed by the source node, cause the source node to implement the communication method according to any one of claims 16 to 30. 50.A target node comprising: at least one processor; a memory storing instructions; wherein the instructions, when executed by the target node, cause the target node to implement the communication method according to any one of claims 31 to 44. 51.A communication system comprising: a terminal configured to implement the communication method according to any one of claims 1 to 15; a source node configured to implement the communication method according to any one of claims 16 to 30; and a target node configured to implement the communication method according to any one of claims 31 to 44.

52. A storage medium storing instructions, wherein, When the instructions are run on a communications device, cause the communications device to perform a communications method as claimed in any of claims 1 to 44.

53. A computer program product comprising computer programs which, when run on a communications device, cause the communications device to perform a communications method as claimed in any of claims 1 to 44.

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