Communication method and communication device

Abstract

The invention provides a communication method and a communication device, which can be applied to a non-ground communication network, such as a satellite network, an unmanned aerial vehicle platform, a high-altitude platform and the like. In the method, a first terminal device receives first information and second information from a first node, the first information comprises public information for carrying out mobility management on at least one terminal device in at least one area corresponding to a second node, and the second information comprises special information for carrying out mobility management on the first terminal device. The at least one region comprises a region served by the first node, and the at least one terminal device comprises the first terminal device; the first terminal equipment executes a mobility management process in an area served by the first node based on the first information and the second information; and the first terminal equipment receives the updated second information from the first node. The signaling overhead in the mobility management process of the first terminal device can be reduced by only receiving the update dedicated information.

Description

Technical Field

[0001] The present application relates to the field of non-terrestrial communication technologies such as satellite networks, and more specifically, to a communication method and a communication device. Background Art

[0002] Non-terrestrial networks (NTN) include nodes such as satellite networks, high-altitude platforms and drones, and are related to the fifth generation (5 th The 5G generation and 5G communication systems together constitute a global integrated communication network with seamless coverage of sea, land, air, space and ground, which can meet the needs of various businesses.

[0003] In non-terrestrial networks (such as beam-hopping satellite communication systems), the movement of satellite nodes may cause group switching or group reselection of user equipment (UE) in a certain area. In group switching / group reselection triggered mainly by network (such as satellite) movement, the signaling overhead transmitted between the source node and the destination node is extremely large, and the efficiency of group switching / group reselection is low. For example, a single satellite covers 1.72×10 6 Square kilometer, the average service time is 5 minutes, assuming that there are 10 radio resource control (RRC) connected UEs per square kilometer, the signaling overhead of the inter-satellite (i.e. source node and destination node) interaction caused by a single UE handover is about 23Kbits, and the inter-satellite signaling overhead caused by the UE group handover can reach several Gbps or even tens of Gbps. Therefore, how to perform efficient and low-cost mobility management of UEs in NTN scenarios is an issue that needs to be considered. Summary of the invention

[0004] The present application provides a communication method and a communication device, which can reduce the signaling overhead of mobility management of terminal equipment in an NTN scenario.

[0005] In a first aspect, a communication method is provided, which can be executed by a first terminal device, or a chip or circuit configured in the first terminal device, which is not limited in this application. The following description is based on the execution by the first terminal device.

[0006] The method includes: a first terminal device receives first information and second information from a first node, the first information includes public information for performing mobility management on at least one terminal device in at least one area corresponding to the second node, and the second information includes dedicated information for performing mobility management on the first terminal device, the at least one area includes an area served by the first node, and the at least one terminal device includes the first terminal device; the first terminal device executes a mobility management process in the area served by the first node based on the first information and the second information; the first terminal device receives the updated second information from the first node.

[0007] Based on the above scheme, by dividing the information used for the mobility management of the terminal device into public information and private information, and only receiving updated private information of the terminal device in the mobility management process of the terminal device, the signaling overhead of the terminal device in the mobility management process can be reduced.

[0008] In combination with the first aspect, in some implementations of the first aspect, the first node may be a node in the NTN, and the first node may carry part of the functions of the base station, for example, carrying part or all of the functions of the gNB-DU.

[0009] In combination with the first aspect, in some implementations of the first aspect, the first node is a first satellite, and the second node is a second satellite or a ground station corresponding to the first satellite.

[0010] In combination with the first aspect, in certain implementations of the first aspect, the first information includes at least one of the following information: an identifier of the interface F1 application protocol AP between the first node and at least one node, a public measurement configuration, a public cell group configuration, a public wireless bearer configuration, and a public synchronization reconfiguration; wherein the at least one node includes the first node; and the second information includes at least one of the following information: a dedicated measurement configuration of the first terminal device, a dedicated cell group configuration of the first terminal device, a dedicated wireless bearer configuration of the first terminal device, and a dedicated synchronization reconfiguration of the first terminal device.

[0011] In combination with the first aspect, in certain implementations of the first aspect, the public measurement configuration includes at least one of the following information: a measurement timing configuration SMTC based on a synchronization signal block, location information of the second node, and measurement priority of at least one area; and, the public synchronization reconfiguration includes at least one of the following information: the time domain configuration, preamble code or frequency domain configuration of the access opportunity RO corresponding to the access target area in the mobility management process, and the validity period of the F1 AP.

[0012] In combination with the first aspect, in certain implementations of the first aspect, the dedicated measurement configuration includes at least one of the following items: multiple measurement timing configurations SMTC based on synchronization signal blocks, a measurement timing configuration SMTC period extension factor based on synchronization signal blocks or a measurement timing configuration SMTC offset value based on synchronization signal blocks, and ephemeris information of the first node; and the dedicated synchronization reconfiguration includes at least one of the following information: an extension factor and / or a continuous number of frames of an access opportunity RO corresponding to the mobility management process accessing the target area, and an offset value of the validity period of the F1 AP.

[0013] In combination with the first aspect, in certain implementations of the first aspect, in an initial access process of the first terminal device, the first terminal device receives the first information and the second information from the first node.

[0014] In a second aspect, a communication method is provided, which may be executed by a first node, or may be a chip or circuit configured in the first node, which is not limited in the present application. The following description is based on the execution by the first node.

[0015] The method includes: a first node sends first information and second information to a first terminal device, the first information includes public information for mobility management of at least one terminal device in at least one area corresponding to the second node, and the second information includes dedicated information for mobility management of the first terminal device, the at least one area includes an area served by the first node, and the at least one terminal device includes the first terminal device; the first node executes a mobility management process for the first terminal device in the area served by the first node based on a measurement report, and the measurement report is determined based on the first information and the second information; the first node sends the updated second information to the first terminal device.

[0016] Based on the above scheme, by dividing the information used for the mobility management of the terminal device into public information and private information, and sending only the updated private information of the terminal device in the mobility management process of the terminal device, the signaling overhead of the first node in the mobility management process can be reduced.

[0017] In combination with the second aspect, in some implementations of the second aspect, the first node may be a node in the NTN, and the first node may carry part of the functions of the base station, for example, carrying part or all of the functions of the gNB-DU.

[0018] In combination with the second aspect, in some implementations of the second aspect, the first node is a first satellite, and the second node is a second satellite or a ground station corresponding to the first satellite.

[0019] In combination with the second aspect, in certain implementations of the second aspect, the first information includes at least one of the following information: an identifier of the interface F1 application protocol AP between the second node and at least one node, a public measurement configuration, a public cell group configuration, a public wireless bearer configuration, and a public synchronization reconfiguration; wherein the at least one node includes the first node; and the second information includes at least one of the following information: a dedicated measurement configuration of the first terminal device, a dedicated cell group configuration of the first terminal device, a dedicated wireless bearer configuration of the first terminal device, and a dedicated synchronization reconfiguration of the first terminal device.

[0020] In combination with the second aspect, in certain implementations of the second aspect, the public measurement configuration includes at least one of the following information: a measurement timing configuration SMTC based on a synchronization signal block, location information of the second node, and measurement priority of at least one area; and, the public synchronization reconfiguration includes at least one of the following information: the time domain configuration, preamble code or frequency domain configuration of the access opportunity RO corresponding to the access target area in the mobility management process, and the validity period of the F1 AP.

[0021] In combination with the second aspect, in certain implementations of the second aspect, the dedicated measurement configuration includes at least one of the following items: multiple measurement timing configurations SMTC based on synchronization signal blocks, a measurement timing configuration SMTC period extension factor based on synchronization signal blocks or a measurement timing configuration SMTC offset value based on synchronization signal blocks, and ephemeris information of the first node; and the dedicated synchronization reconfiguration includes at least one of the following information: an extension factor and / or a continuous number of frames of the access opportunity RO corresponding to the mobility management process accessing the target area, and an offset value of the validity period of the F1 AP.

[0022] In combination with the second aspect, in some implementations of the second aspect, the method further includes: the first node receiving the first information from the second node.

[0023] In combination with the second aspect, in certain implementations of the second aspect, in an initial access process of the first terminal device, the first node receives the first information from the second node.

[0024] In combination with the second aspect, in certain implementations of the second aspect, in an initial access process of the first terminal device, the first node sends the first information and the second information to the first terminal device.

[0025] In a third aspect, a communication method is provided, which can be executed by a first terminal device, or a chip or circuit configured in the first terminal device, which is not limited in this application. The following description is based on the execution by the first terminal device.

[0026] The method includes: a first terminal device receives first information and second information from a first node, the first information includes public information for performing mobility management on at least one terminal device in at least one area corresponding to the second node, the second information includes dedicated information for performing mobility management on the first terminal device, the at least one area includes an area served by the first node, and the at least one terminal device includes the first terminal device; the first terminal device executes a mobility management process from the area served by the first node to the first area based on the first information and the second information, and the first area is an area served by a third node; the first terminal device receives third information from the third node, the third information includes dedicated information for performing mobility management on the first terminal device, the third information is determined by the third node, and the at least one area includes an area served by the third node.

[0027] Based on the above scheme, by dividing the information used for mobility management of terminal devices into public information and private information, and only receiving the private information of the terminal device in the mobility management process of the terminal device from the area served by one node to the area served by another node, the signaling overhead of the terminal device in the mobility management process can be reduced.

[0028] In combination with the third aspect, in certain implementations of the third aspect, the first node and the third node may be nodes in the NTN, and the first node and the third node may carry part of the functions of the base station, for example, carrying part or all of the functions of the gNB-DU.

[0029] In combination with the third aspect, in certain implementations of the third aspect, the first node is a first satellite, the second node is a second satellite or a ground station corresponding to the first satellite, and the third node is a third satellite.

[0030] In combination with the third aspect, in certain implementations of the third aspect, the first information includes at least one of the following information: an identifier of the F1 interface application protocol between the second node and at least one node, a public measurement configuration, a public cell group configuration, a public wireless bearer configuration, and a public synchronization reconfiguration; wherein the at least one node includes the first node and the third node; and the third information includes at least one of the following information: a dedicated measurement configuration of the first terminal device, a dedicated cell group configuration of the first terminal device, a dedicated wireless bearer configuration of the first terminal device, and a dedicated synchronization reconfiguration of the first terminal device.

[0031] In combination with the third aspect, in certain implementations of the third aspect, the public measurement configuration includes at least one of the following information: a measurement timing configuration SMTC based on a synchronization signal block, location information of the second node, and measurement priority of at least one area; and, the public synchronization reconfiguration includes at least one of the following information: the time domain configuration, preamble code or frequency domain configuration of the access opportunity RO corresponding to the access target area in the mobility management process, and the validity period of the F1 AP.

[0032] In combination with the third aspect, in certain implementations of the third aspect, the dedicated measurement configuration includes at least one of the following items: multiple SMTCs, an SMTC period extension factor or an SMTC offset value, and the ephemeris information of the first node; and the dedicated synchronization reconfiguration includes at least one of the following information: an extension factor and / or the number of consecutive frames of the access timing RO corresponding to the mobility management process accessing the target area, and an offset value of the validity period of the F1 AP.

[0033] In combination with the third aspect, in certain implementations of the third aspect, in an initial access process of the first terminal device, the first terminal device receives the first information and the second information from the first node.

[0034] In a fourth aspect, a communication method is provided, which may be executed by a third node, or may be a chip or circuit configured in the third node, which is not limited in the present application. The following description is based on the case where the method is executed by the third node.

[0035] The method includes: a third node executes a mobility management process for a first terminal device from an area served by the first node to a first area, the first area being an area served by the third node, the execution of the mobility management process is determined based on first information and second information, the first information includes public information for mobility management of at least one terminal device in at least one area corresponding to the second node, the second information includes dedicated information for mobility management of the first terminal device, the second information is determined by the first node, the at least one area includes an area served by the first node and an area served by the third node, and the at least one terminal device includes the first terminal device; the third node sends third information to the first terminal device, the third information includes dedicated information for mobility management of the first terminal device, and the third information is determined by the third node.

[0036] Based on the above scheme, by dividing the information used for mobility management of terminal devices into public information and private information, and only sending the private information of the terminal device in the mobility management process from the area served by one node to the area served by another node (such as a third node), the signaling overhead of the third node in the mobility management process can be reduced.

[0037] In combination with the fourth aspect, in some implementations of the fourth aspect, the first node and the third node may be nodes in the NTN, and the first node and the third node may carry part of the functions of the base station, for example, carrying part or all of the functions of the gNB-DU.

[0038] In combination with the fourth aspect, in certain implementations of the fourth aspect, the first node is a first satellite, the second node is a second satellite or a ground station corresponding to the first satellite, and the third node is a third satellite.

[0039] In combination with the fourth aspect, in certain implementations of the fourth aspect, the first information includes at least one of the following information: an identifier of the interface F1 application protocol AP between the second node and at least one node, a public measurement configuration, a public cell group configuration, a public wireless bearer configuration, and a public synchronization reconfiguration; wherein the at least one node includes the first node and the third node; and the third information includes at least one of the following information: a dedicated measurement configuration of the first terminal device, a dedicated cell group configuration of the first terminal device, a dedicated wireless bearer configuration of the first terminal device, and a dedicated synchronization reconfiguration of the first terminal device.

[0040] In combination with the fourth aspect, in certain implementations of the fourth aspect, the public measurement configuration includes at least one of the following information: a measurement timing configuration SMTC based on a synchronization signal block, location information of the second node, and measurement priority of at least one area; and, the public synchronization reconfiguration includes at least one of the following information: the time domain configuration, preamble code or frequency domain configuration of the access opportunity RO corresponding to the access target area in the mobility management process, and the validity period of the F1 AP.

[0041] In combination with the fourth aspect, in certain implementations of the fourth aspect, the dedicated measurement configuration includes at least one of the following items: multiple measurement timing configurations SMTC based on synchronization signal blocks, a measurement timing configuration SMTC period extension factor based on synchronization signal blocks or a measurement timing configuration SMTC offset value based on synchronization signal blocks, and ephemeris information of the first node; and the dedicated synchronization reconfiguration includes at least one of the following information: an extension factor and / or a continuous number of frames of the access opportunity RO corresponding to the mobility management process accessing the target area, and an offset value of the validity period of the F1 AP.

[0042] In combination with the fourth aspect, in certain implementations of the fourth aspect, the first information and the second information are sent by the first node in an initial access process of the first terminal device.

[0043] In a fifth aspect, a communication device is provided, which includes a transceiver unit and a processing unit. The transceiver unit is used to receive first information and second information from a first node, the first information includes public information for mobility management of at least one terminal device in at least one area corresponding to the second node, and the second information includes dedicated information for mobility management of the device, the at least one area includes an area served by the first node, and the at least one terminal device includes the device; the processing unit is used to execute a mobility management process in the area served by the first node based on the first information and the second information; the transceiver unit is also used to receive the updated second information from the first node.

[0044] In combination with the fifth aspect, in certain implementations of the fifth aspect, the first node may be a node in the NTN, and the first node may carry part of the functions of the base station, for example, carrying part or all of the functions of the gNB-DU.

[0045] In combination with the fifth aspect, in certain implementations of the fifth aspect, the first node is a first satellite, and the second node is a second satellite or a ground station corresponding to the first satellite.

[0046] In combination with the fifth aspect, in certain implementations of the fifth aspect, the first information includes at least one of the following information: an identifier of the interface F1 application protocol AP between the first node and at least one node, a public measurement configuration, a public cell group configuration, a public wireless bearer configuration, and a public synchronization reconfiguration; wherein the at least one node includes the first node; and the second information includes at least one of the following information: a dedicated measurement configuration of the device, a dedicated cell group configuration of the device, a dedicated wireless bearer configuration of the device, and a dedicated synchronization reconfiguration of the device.

[0047] In combination with the fifth aspect, in certain implementations of the fifth aspect, the public measurement configuration includes at least one of the following information: a measurement timing configuration SMTC based on a synchronization signal block, location information of the second node, and measurement priority of at least one area; and, the public synchronization reconfiguration includes at least one of the following information: the time domain configuration, preamble code or frequency domain configuration of the access opportunity RO corresponding to the access target area in the mobility management process, and the validity period of the F1 AP.

[0048] In combination with the fifth aspect, in certain implementations of the fifth aspect, the dedicated measurement configuration includes at least one of the following items: multiple measurement timing configurations SMTC based on synchronization signal blocks, a measurement timing configuration SMTC period extension factor based on synchronization signal blocks or a measurement timing configuration SMTC offset value based on synchronization signal blocks, and ephemeris information of the first node; and the dedicated synchronization reconfiguration includes at least one of the following information: an extension factor and / or a continuous number of frames of the access opportunity RO corresponding to the mobility management process accessing the target area, and an offset value of the validity period of the F1 AP.

[0049] In combination with the fifth aspect, in certain implementations of the fifth aspect, in an initial access process of the device, the device receives the first information and the second information from the first node.

[0050] In a sixth aspect, a communication device is provided, which includes a transceiver unit and a processing unit, the transceiver unit being used to send first information and second information to a first terminal device, the first information including public information for mobility management of at least one terminal device in at least one area corresponding to a second node, the second information including dedicated information for mobility management of the first terminal device, the at least one area including an area served by the device, and the at least one terminal device including the first terminal device; the processing unit being used to execute a mobility management process of the first terminal device in the area served by the device based on a measurement report, the measurement report being determined based on the first information and the second information; the transceiver unit being further used to send the updated second information to the first terminal device.

[0051] In combination with the sixth aspect, in certain implementations of the sixth aspect, the device may be a node in the NTN, and the device may carry part of the functions of the base station, for example, carrying part or all of the functions of the gNB-DU.

[0052] In combination with the sixth aspect, in certain implementations of the sixth aspect, the device is a first satellite, and the second node is a second satellite or a ground station corresponding to the first satellite.

[0053] In combination with the sixth aspect, in certain implementations of the sixth aspect, the first information includes at least one of the following information: an identifier of the interface F1 application protocol AP between the second node and at least one node, a public measurement configuration, a public cell group configuration, a public wireless bearer configuration, and a public synchronization reconfiguration; wherein the at least one node includes the device; and the second information includes at least one of the following information: a dedicated measurement configuration of the first terminal device, a dedicated cell group configuration of the first terminal device, a dedicated wireless bearer configuration of the first terminal device, and a dedicated synchronization reconfiguration of the first terminal device.

[0054] In combination with the sixth aspect, in certain implementations of the sixth aspect, the public measurement configuration includes at least one of the following information: a measurement timing configuration SMTC based on a synchronization signal block, location information of the second node, and measurement priority of at least one area; and, the public synchronization reconfiguration includes at least one of the following information: the time domain configuration, preamble code or frequency domain configuration of the access opportunity RO corresponding to the access target area in the mobility management process, and the validity period of the F1 AP.

[0055] In combination with the sixth aspect, in certain implementations of the sixth aspect, the dedicated measurement configuration includes at least one of the following items: multiple measurement timing configurations SMTC based on synchronization signal blocks, a measurement timing configuration SMTC period extension factor based on synchronization signal blocks or a measurement timing configuration SMTC offset value based on synchronization signal blocks, and the ephemeris information of the device; and the dedicated synchronization reconfiguration includes at least one of the following information: an extension factor and / or a continuous number of frames of the access opportunity RO corresponding to the mobility management process accessing the target area, and an offset value of the validity period of the F1 AP.

[0056] In combination with the sixth aspect, in certain implementations of the sixth aspect, the transceiver unit is further used to receive the first information from the second node.

[0057] In combination with the sixth aspect, in certain implementations of the sixth aspect, the transceiver unit is specifically used to receive the first information from the second node during an initial access process of the first terminal device.

[0058] In combination with the sixth aspect, in certain implementations of the sixth aspect, the transceiver unit is specifically used to send the first information and the second information to the first terminal device during an initial access process of the first terminal device.

[0059] In the seventh aspect, a communication device is provided, which includes a transceiver unit and a processing unit, the transceiver unit is used to receive first information and second information from a first node, the first information includes public information for mobility management of at least one terminal device in at least one area corresponding to the second node, the second information includes dedicated information for mobility management of the device, the at least one area includes an area served by the first node, and the at least one terminal device includes the device; the processing unit is used to execute a mobility management process from the area served by the first node to the first area based on the first information and the second information, the first area is an area served by a third node; the transceiver unit is also used to receive third information from the third node, the third information includes dedicated information for mobility management of the device, the third information is determined by the third node, and the at least one area includes the area served by the third node.

[0060] In combination with the seventh aspect, in certain implementations of the seventh aspect, the first node and the third node may be nodes in the NTN, and the first node and the third node may carry part of the functions of the base station, for example, carrying part or all of the functions of the gNB-DU.

[0061] In combination with the seventh aspect, in certain implementations of the seventh aspect, the first node is a first satellite, the second node is a second satellite or a ground station corresponding to the first satellite, and the third node is a third satellite.

[0062] In combination with the seventh aspect, in certain implementations of the seventh aspect, the first information includes at least one of the following information: an identifier of the F1 interface application protocol between the second node and at least one node, a public measurement configuration, a public cell group configuration, a public wireless bearer configuration, and a public synchronization reconfiguration; wherein the at least one node includes the first node and the third node; and the third information includes at least one of the following information: a dedicated measurement configuration of the device, a dedicated cell group configuration of the device, a dedicated wireless bearer configuration of the device, and a dedicated synchronization reconfiguration of the device.

[0063] In combination with the seventh aspect, in certain implementations of the seventh aspect, the public measurement configuration includes at least one of the following information: a measurement timing configuration SMTC based on a synchronization signal block, location information of the second node, and measurement priority of at least one area; and, the public synchronization reconfiguration includes at least one of the following information: the time domain configuration, preamble code or frequency domain configuration of the access opportunity RO corresponding to the access target area in the mobility management process, and the validity period of the F1 AP.

[0064] In combination with the seventh aspect, in certain implementations of the seventh aspect, the dedicated measurement configuration includes at least one of the following items: multiple SMTCs, an SMTC period extension factor or an SMTC offset value, and the ephemeris information of the first node; and the dedicated synchronization reconfiguration includes at least one of the following information: an extension factor and / or the number of consecutive frames of the access timing RO corresponding to the access target area of ​​the mobility management process, and an offset value of the validity period of the F1 AP.

[0065] In combination with the seventh aspect, in certain implementations of the seventh aspect, the transceiver unit is specifically used to receive the first information and the second information from the first node during an initial access process of the device.

[0066] In an eighth aspect, a communication device is provided, which includes a transceiver unit and a processing unit, wherein the processing unit is used to execute a mobility management process for a first terminal device from an area served by a first node to a first area, wherein the first area is an area served by the device, and the execution of the mobility management process is determined based on first information and second information, wherein the first information includes public information for mobility management of at least one terminal device in at least one area corresponding to the second node, and the second information includes dedicated information for mobility management of the first terminal device, and the second information is determined by the first node, the at least one area includes an area served by the first node and an area served by the device, and the at least one terminal device includes the first terminal device; the transceiver unit is used to send third information to the first terminal device, wherein the third information includes dedicated information for mobility management of the first terminal device, and the third information is determined by the device.

[0067] In combination with the eighth aspect, in certain implementations of the eighth aspect, the first node and the device may be nodes in the NTN, and the first node and the device may carry part of the functions of the base station, for example, carrying part or all of the functions of the gNB-DU.

[0068] In combination with the eighth aspect, in certain implementations of the eighth aspect, the first node is a first satellite, the second node is a second satellite or a ground station corresponding to the first satellite, and the device is a third satellite.

[0069] In combination with the eighth aspect, in certain implementations of the eighth aspect, the first information includes at least one of the following information: an identifier of the interface F1 application protocol AP between the second node and at least one node, a public measurement configuration, a public cell group configuration, a public wireless bearer configuration, and a public synchronization reconfiguration; wherein the at least one node includes the first node and the device; and the third information includes at least one of the following information: a dedicated measurement configuration of the first terminal device, a dedicated cell group configuration of the first terminal device, a dedicated wireless bearer configuration of the first terminal device, and a dedicated synchronization reconfiguration of the first terminal device.

[0070] In combination with the eighth aspect, in certain implementations of the eighth aspect, the public measurement configuration includes at least one of the following information: a measurement timing configuration SMTC based on a synchronization signal block, location information of the second node, and measurement priority of at least one area; and, the public synchronization reconfiguration includes at least one of the following information: the time domain configuration, preamble code or frequency domain configuration of the access opportunity RO corresponding to the access target area in the mobility management process, and the validity period of the F1 AP.

[0071] In combination with the eighth aspect, in certain implementations of the eighth aspect, the dedicated measurement configuration includes at least one of the following items: multiple measurement timing configurations SMTC based on synchronization signal blocks, a measurement timing configuration SMTC period extension factor based on synchronization signal blocks or a measurement timing configuration SMTC offset value based on synchronization signal blocks, and the ephemeris information of the first node; and the dedicated synchronization reconfiguration includes at least one of the following information: an extension factor and / or a continuous number of frames of the access opportunity RO corresponding to the mobility management process accessing the target area, and an offset value of the validity period of the F1 AP.

[0072] In combination with the eighth aspect, in certain implementations of the eighth aspect, the first information and the second information are sent by the first node in an initial access process of the first terminal device.

[0073] In a ninth aspect, the present application provides a communication device. In one design, the communication device may include a module for executing the method / operation / step / action described in any one of the first to fourth aspects or the first to fourth aspects. The module may be a hardware circuit, or software, or a combination of a hardware circuit and software. In one design, the communication device may include a processing module and a communication module.

[0074] In a tenth aspect, the present application provides a communication device, the communication device comprising a processor, for implementing the method described in the first aspect or the third aspect, or any implementation of the first aspect or the third aspect. The processor is coupled to a memory, and the memory is used to store instructions and data. When the processor executes the instructions stored in the memory, the method described in the first aspect or the second aspect, or any implementation of the first aspect or the second aspect can be implemented. Optionally, the communication device may also include a memory. Optionally, the communication device may also include a communication interface, and the communication interface is used for the device to communicate with other devices. Exemplarily, the communication interface may be a transceiver, a hardware circuit, a bus, a module, a pin or other types of communication interfaces. In one example, the communication device may be a network device, such as an access network device, or a device, a module or a chip set in the network device, or a device that can be used in combination with the network device.

[0075] In the eleventh aspect, the present application provides a communication device, the communication device includes a processor, and is used to implement the method described in the second aspect or the fourth aspect, or any implementation of the second aspect or the fourth aspect. The processor is coupled to a memory, and the memory is used to store instructions and data. When the processor executes the instructions stored in the memory, the method described in the third aspect or the fourth aspect, or any implementation of the third aspect or the fourth aspect can be implemented. Optionally, the communication device may also include a memory. Optionally, the communication device may also include a communication interface, and the communication interface is used for the device to communicate with other devices. Exemplarily, the communication interface may be a transceiver, a hardware circuit, a bus, a module, a pin or other types of communication interfaces. In one example, the communication device may be a terminal device, or it may be a device, a module or a chip set in the terminal device, or a device that can be used in combination with the terminal device.

[0076] In a twelfth aspect, the present application provides a communication system, including a first node and a third node. Optionally, it also includes at least one of a terminal device and a second node.

[0077] In the thirteenth aspect, the present application also provides a computer program, which, when executed on a computer, enables the computer to execute the method provided in any aspect of the first to fourth aspects above, or in any implementation of the first to fourth aspects.

[0078] In the fourteenth aspect, the present application also provides a computer program product, comprising instructions, which, when executed on a computer, enable the computer to execute the method provided in any aspect of the first to fourth aspects above, or in any implementation of the first to fourth aspects.

[0079] In the fifteenth aspect, the present application also provides a computer-readable storage medium, in which a computer program or instruction is stored. When the computer program or instruction is run on a computer, the computer executes the method provided in any aspect of the first to fourth aspects above, or any implementation of the first to fourth aspects.

[0080] In the sixteenth aspect, the present application also provides a chip, which is used to read a computer program stored in a memory and execute the method provided by any implementation of the first to fourth aspects or the first to fourth aspects; or, the chip includes a circuit for executing the method provided by any aspect of the first to fourth aspects or any aspect of the first to fourth aspects.

[0081] In the seventeenth aspect, the present application further provides a chip system, which includes a processor for supporting a device to implement any aspect of the first to fourth aspects above, or a method provided by any implementation of the first to fourth aspects. In one possible design, the chip system also includes a memory, which is used to store programs and data necessary for the device. The chip system can be composed of chips, or it can include chips and other discrete devices.

[0082] For the technical effects of the solutions provided by any aspect from the ninth to the seventeenth aspect or any implementation method thereof, reference can be made to the corresponding description of the first aspect and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0083] Figure 1 is a schematic diagram of a communication system suitable for the present application.

[0084] Figure 2 It is a schematic architecture diagram of satellite communication.

[0085] Figure 3 It is a schematic diagram of a beam-hopping satellite communication system.

[0086] Figure 4 It is a schematic diagram of the group switching problem in the beam-hopping satellite communication system.

[0087] Figure 5 It is a schematic flow chart of a communication method 500 provided in the present application.

[0088] Figure 6 A schematic diagram of the service range of a first node and a second node.

[0089] Figure 7 It is a schematic flow chart of a communication method 700 provided in the present application.

[0090] Figure 8 This is a schematic flowchart of an initial access provided by this application.

[0091] Fig. 9 It is a schematic flow chart of a communication method 900 provided in the present application.

[0092] Fig.10 It is a schematic flow chart of a communication method 1000 provided in this application.

[0093] Fig.11 It is a schematic block diagram of a communication device 1000 provided in an embodiment of the present application.

[0094] Fig.12 It is a schematic block diagram of a communication device 2000 provided in an embodiment of the present application.

[0095] Fig.13 It is a schematic block diagram of a chip system 3000 provided in an embodiment of the present application. DETAILED DESCRIPTION

[0096] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0097] The technical solution of the present application can be applied to satellite communication systems, high altitude platform station (HAPS) communications, drones and other non-terrestrial network (NTN) systems, such as integrated communication and navigation (IcaN) systems, global navigation satellite systems (GNSS) and ultra-dense low-orbit satellite communication systems. Satellite communication systems can be integrated with traditional mobile communication systems. For example, the mobile communication system can be a fourth generation (4 th The fifth generation (4G) communication system (for example, the long term evolution (LTE) system), the world wide interoperability for microwave access (WiMAX) communication system, the fifth generation (5 th generation, 5G) communication system, the sixth generation (6 th generation, 6G) communication systems, and possible future mobile communication systems, etc.

[0098] Among them, NTN includes satellite networks, high-altitude platforms and drones, etc., with significant advantages such as global coverage, long-distance transmission, flexible networking, convenient deployment and no geographical restrictions, and has been widely used in maritime communications, positioning navigation, disaster relief, scientific experiments, video broadcasting and earth observation, etc. Ground 5G networks and satellite networks are integrated with each other, complementing each other's strengths and weaknesses, and jointly constitute a global seamless coverage of sea, land, air, space and ground integrated integrated communication network, which can meet the various business needs of users.

[0099] As an important part of NTN, the next-generation satellite network generally shows a trend of ultra-dense and heterogeneous: first, the scale of the satellite network has grown from 66 satellites in the Iridium constellation to 720 satellites in the OneWeb constellation, and finally extended to the 12,000+ Starlink ultra-dense LEO satellite constellation; secondly, the satellite network shows heterogeneous characteristics, from the traditional single-layer communication network to the multi-layer communication network, the functions of the communication satellite network also tend to be complex and diversified, gradually compatible with and support functions such as navigation enhancement, earth observation, and multi-dimensional information on-orbit processing.

[0100] Figure 1 : is a schematic diagram of an NTN communication system applicable to an embodiment of the present application. The NTN (satellite) communication system includes satellite 101, satellite 102 and satellite 103, and each satellite can provide services to terminal devices through multiple beams, such as communication services, navigation services and positioning services. The satellite in this scenario is a low earth orbit (LEO) satellite. Satellite 103 is connected to ground station equipment. The satellite uses multiple beams to cover the service area, and different beams can communicate through one or more of time division, frequency division and space division. The satellite communicates wirelessly with the terminal device by broadcasting communication signals and navigation signals. The satellite can communicate wirelessly with the ground station equipment.

[0101] In addition, satellite communication systems can include transparent satellite architecture and non-transparent satellite architecture. Transparent transmission is also called bent-pipe forwarding transmission: the signal only undergoes frequency conversion, signal amplification and other processes on the satellite, and the satellite is transparent to the signal. Non-transparent transmission is also called regenerative (on-board access / processing) transmission: the satellite has some or all base station functions. For example, Figure 1 Satellites 101 and 102 in the system are non-transparent satellite architectures, and satellite 103 is a transparent satellite architecture. In addition, the satellites can operate in a quasi earth-fixed mode or a non-staring earth-moving mode.

[0102] The terminal device mentioned in the embodiments of the present application may include various communication kits (communication kits) with wireless communication functions, the kits may include, for example, antennas, power supply templates, cables, and Wi-Fi modules, etc.), handheld devices, vehicle-mounted devices, or other processing devices connected to a wireless modem, and may specifically refer to user equipment (UE), access terminals, user units, user stations, mobile stations, mobile stations, remote stations, remote terminals, mobile devices, user terminals, terminals, wireless communication devices, user agents, or user devices. The terminal device may also be a communication module with satellite communication functions, a satellite phone or its components, a very small aperture terminal (VSAT), a wireless modem, a machine type communication device, or other processing devices connected to a wireless modem. It can also be a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a terminal in self-driving, a terminal in remote medical, a terminal in smart grid, a terminal in transportation safety, a terminal in smart city, a terminal in smart home, or a terminal device in future communication network, etc. Of course, the terminal device in this application can also refer to a chip, a modem, a system on a chip (SoC) or a communication platform that can include a radio frequency RF part, etc., which is mainly responsible for the relevant communication functions in the device.

[0103] The ground station equipment can be a device in the core network (CN) of the existing mobile communication architecture (such as the 3rd generation partnership project (3GPP) access architecture of the 5G network), or a device in the core network in the future mobile communication architecture, a device used for connecting the satellite and the core network, or a relay device for satellite communication. Among them, the core network provides an interface to the data network as a bearer network, which is used to provide communication connection, authentication, management, policy control and data service bearing for the UE. CN may further include: access and mobility management function (AMF), session management function (SMF), authentication server function (AUSF), policy control function (PCF), user plane function (UPF), etc. Among them, the AMF network element is used to manage the access and mobility of the UE, and is mainly responsible for the authentication of the UE, the mobility management of the UE, the paging of the UE and other functions.

[0104] The network device may include, but is not limited to: an evolved Node B (eNB), a baseband unit (BBU), an access point (AP) in a wireless fidelity (WIFI) system, a wireless relay node, a wireless backhaul node, a transmission point (TP) or a transmission reception point (TRP), etc. The network device may also be a gNB, a TRP or a TP in a 5G system, or one or a group of antenna panels (including multiple antenna panels) of a base station in a 5G system. In addition, the network device may also be a network node constituting a gNB or TP, such as a BBU, etc. Alternatively, the network device is a device-to-device (D2D) communication system, a machine-to-machine (M2M) communication system, an Internet of Things (IoT), an Internet of Vehicles communication system, or a device that undertakes network-side functions in other communication systems.

[0105] The network devices involved in the embodiments of the present application may include a centralized unit (CU) and / or a distributed unit (DU). CU and DU can be understood as a division of network devices from a logical function perspective. CU and DU can be physically separated or deployed together. Multiple DUs can share one CU. A DU can also be connected to multiple CUs. CU and DU can be connected through an interface, such as an F1 interface.

[0106] CU and DU can be divided according to the protocol layer of the wireless network. One possible division method is: CU is used to perform the functions of the radio resource control (RRC) layer, service data adaptation protocol (SDAP) layer and packet data convergence protocol (PDCP) layer; DU is used to perform the functions of the radio link control (RLC) layer, media access control (MAC) layer, physical (PHY) layer, etc.

[0107] It can be understood that the above division of the processing functions of the CU and DU according to the protocol layer is only an example, and the CU and DU can also be divided in other ways. For example, the CU or DU can be divided into functions of more protocol layers than the above division method. For example, the CU or DU can also be divided into some processing functions of the protocol layer of the above division method.

[0108] Alternatively, the functions of CU or DU can be divided according to service type or other system requirements, for example, by latency, where functions whose processing time meets the latency requirement are implemented in DU, and functions that do not meet the latency requirement are implemented in CU.

[0109] Alternatively, the CU may also have one or more functions of the core network. One or more CUs may be centrally set or separately set. For example, the CU may be set on the network side for centralized management. The DU may have multiple radio frequency functions or the radio frequency functions may be remotely set.

[0110] The functions of CU can be implemented by one entity or by different entities. For example, the functions of CU can be further divided, for example, the control plane (CP) and the user plane (UP) are separated. That is, the CU is divided into the control plane (CU-CP) and the CU user plane (CU-UP). CU-CP can also include a further divided architecture, that is, the CU-CP is divided into CU-CP1 and CU-CP2. Among them, CU-CP1 can include various radio resource management functions, and CU-CP2 can include RRC functions and PDCP-C functions (that is, the basic functions of control plane signaling at the PDCP layer).

[0111] In different systems, CU (including CU-CP or CU-UP) or DU may have different names, but those skilled in the art can understand their meanings. For example, in an open radio access network (O-RAN) system, CU may be called an open CU (open CU, O-CU), and DU may be called an open DU (open DU, O-DU). Alternatively, CU-CP may be called O-CU-CP, and CU-UP may be called O-CU-UP. For the convenience of description, CU and DU are used as examples for description in this application.

[0112] The satellites mentioned in the embodiments of the present application may be LEO satellites, medium orbit earth satellites (MEO) satellites, geosynchronous orbit (GEO) satellites, etc., or satellite base stations, or orbital receivers or repeaters for relaying information, or network equipment carried on satellites, that is, satellites have some or all of the functions of network equipment, for example, satellites can be used as gNB-DU. Satellites can provide services to ground terminal equipment through multiple beams. When a satellite uses multiple beams to cover a service area, different beams can provide services to the service area through one or more of time division, frequency division, and space division, and different beams can also use different polarization methods, such as circular polarization (including left-hand circular polarization and right-hand circular polarization). Satellites can communicate wirelessly with terminal equipment through broadcast communication signals and navigation signals, etc. In addition, satellites can communicate wirelessly with ground station equipment.

[0113] According to the working mode of the payload (such as beam), satellite communication systems can usually be divided into staring (earth-fixed or quasi-earth fixed) satellite communication systems and non-staring (earth-moving) satellite communication systems. Figure 2As shown in (a), the beam coverage of satellites (e.g., satellite #1, satellite #2, and satellite #3) in the non-staring satellite communication system moves with the satellites within a period of time (e.g., time T1, time T2, and time T3); Figure 2 As shown in (b), in a staring satellite communication system, the satellite dynamically adjusts the beam pointing so that the beam approximately covers the same area on the ground over a period of time.

[0114] To facilitate understanding of the embodiments of the present application, the terms that may be involved in the present application are explained.

[0115] 1. Wave position

[0116] The service area of ​​the satellite network can be divided into multiple small geographical areas according to the geographical location, and each geographical area can be called a wave position. Alternatively, the wave position in the present application can also be expressed as a geographical area, a region or a service area, etc. In addition, the wave position can be represented by different shapes, such as one or more of a regular hexagon, a pentagon, a circle, an ellipse, a rectangle, etc.

[0117] 2. Beam-hopping satellite communication system

[0118] Generally speaking, the coverage of a single satellite is very wide, reaching several thousand meters or even tens of thousands of kilometers; the coverage of a single beam can be as small as tens of meters or even several thousand meters. Therefore, in order to support wide-area coverage, a single satellite is usually equipped with hundreds or even thousands of beams, which brings huge challenges to the payload of satellites, especially LEO satellites. In order to alleviate the contradiction between the small payload (such as beam) of a single satellite and the wide coverage range, the beam-hopping satellite communication system came into being. Specifically, in the beam-hopping satellite communication system, a single satellite is equipped with only a small number of beams (such as several or dozens of beams), and the beams serve the coverage area of ​​a single satellite in a time-sharing manner.

[0119] Figure 3 Figure 1 is a schematic diagram of a beam-hopping satellite communication system. Figure 3 As shown in the figure, the satellite forms 4 beams at a time to cover the corresponding area (i.e., beam position). For example, at time T1, four beams 0, 1, 4, and 5 are formed; at time T2, four beams 2, 3, 6, and 7 are formed, and so on. All areas covered by a single satellite (i.e., the areas corresponding to the 16 beams) are served in a time-sharing manner at time T1, time T2, time T3, and time T4.

[0120] 3. Mobility Management

[0121] In a beam-hopping satellite communication system, the movement of satellite nodes may cause group switching (connected UEs) or group reselection (idle UEs or inactive UEs) of UEs within a certain area.

[0122] Figure 4 This is a schematic diagram of a group switching. Figure 4 As shown, at time T1, one or more beams of satellite SAT-2 serve UE cluster (UE-Group) 1 located in a single beam position of zone (Zone)-2, abbreviated as UE-G1 (UE-G1 contains at least one UE); at time T2, due to the movement of satellite SAT-2, satellite SAT-2 cannot serve UE-G1, but one or more beams of satellite SAT-1 take over satellite SAT-2 to serve UE-G1. Therefore, group switching may occur in UE-G1. In addition, due to the fast movement speed of the satellite, for example, about 7.5km / s, the frequency of group switching of UE clusters within the coverage of the satellite is about every time / several seconds to tens of seconds. In other words, in the beam-hopping satellite communication system, group switching or group reselection mainly triggered by satellite node movement becomes the norm. The mobility management of UE clusters within the coverage of a single satellite may bring huge signaling overhead between satellites or cells (taking cell switching as an example, the overhead between satellites for a single switching is about 23Kbits, and the total overhead can reach several Gbps or even tens of Gbps).

[0123] Mobility management mainly includes cell switching, cell reselection, registration update and tracking area update. Taking cell switching as an example, the switching process of the ground network mainly includes the following steps:

[0124] 1) Cell handover measurement: The network sends measurement configurations corresponding to multiple cells (including serving cells and neighboring cells) to the UE; the UE measures the signal quality of the cell according to the measurement configuration, such as reference signal received power (RSRP), reference signal received quality (RSRQ), etc.;

[0125] 2) Measurement result reporting: The UE reports the measurement result to the network side. The reporting method can be periodic reporting or event-triggered reporting. In event-triggered reporting, the reporting condition is usually configured as the signal quality of the serving cell is less than the preset threshold and / or the signal quality of the neighboring cell is greater than the preset threshold;

[0126] 3) Handover decision: The network selects a suitable neighboring cell based on the reported measurement results, and interacts with the UE to obtain handover-related context information, admission control, and reserved resources;

[0127] 4) Handover execution: The UE receives handover-related control information from the serving cell and completes the access process in the target cell.

[0128] When the UE switches, the required random access preamble is a dedicated preamble, which is different from the contention-based random access preamble during initial access. In addition, the time domain period of the random access channel (RACH) during switching supports configurations of 10 / 20 / 40 / 80 / 160ms, which is the same as the RACH period configuration for initial access.

[0129] For cell reselection, the network side usually sends neighboring cell-related measurement configuration and other parameters to the UE in the form of broadcast. The UE compares its own measurement values ​​(such as RSRQ, RSRP, etc.) with the parameters sent by the network (such as reselection threshold), and autonomously reselects to the target neighboring cell if the conditions are met. It is worth noting that since the near-far effect is not obvious in NTN (that is, the distance between the UE and different satellites has no obvious impact on the signal quality), the switching / reselection efficiency triggered by signal quality alone is low. Therefore, NR / NTN considers location-assisted switching / reselection enhancement technology, such as time / timer-based, UE location information (for example, the distance between the UE and the reference point of the source cell is greater than the preset threshold, and the distance between the UE and the reference point of the target cell is less than the preset threshold), UE location information combined with timer, UE location information combined with signal quality, and other methods to achieve mobility management in NTN scenarios.

[0130] The existing NR and NTN switching / reselection schemes are usually triggered by UE movement. In NTN networks (especially LEO scenarios), group switching triggered by network (such as satellite) movement has become the norm, and group switching / group reselection triggered by network movement requires a large amount of information exchange, resulting in high signaling overhead.

[0131] In order to facilitate understanding of the embodiments of the present application, the following explanations are made.

[0132] First, in the various embodiments of the present application, unless otherwise specified or logically conflicting, the terms and / or descriptions between the different embodiments are consistent and can be referenced to each other, and the technical features in the different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0133] Second, the first, second and various numerical numbers (e.g., "#1", "#2", etc.) shown in this application are only for convenience of description and are used to distinguish objects, and are not used to limit the scope of the embodiments of the present application. For example, to distinguish different terminal devices, etc., rather than to describe a specific order or sequence. It should be understood that the objects described in this way can be interchangeable where appropriate so as to be able to describe solutions other than the embodiments of the present application.

[0134] Third, in the embodiments of the present application, the words "of", "corresponding, relevant", "corresponding" and "associate" can sometimes be used interchangeably. It should be pointed out that when the distinction between them is not emphasized, the meanings they intend to express are consistent.

[0135] Figure 5 The figure shows a schematic flow chart of a communication method 500 provided by the present application. The method may include the following steps.

[0136] S510: A first node sends first information and second information to a first terminal device. Correspondingly, the first terminal device receives the first information and second information from the first node.

[0137] The first information may include public information for mobility management of at least one terminal device in at least one area corresponding to the second node, and the first information may also be referred to as public part information; the second information may include dedicated information for mobility management of the first terminal device, and the second information may also be referred to as dedicated part information. The at least one area includes an area served by the first node.

[0138] The first terminal device may be any terminal device within the service range of the first node. It is understood that the first terminal device is also within the service range of the second node, or in other words, the at least one terminal device includes the first terminal device. Optionally, the service range of the second node may also include other terminal devices.

[0139] Exemplarily, the mobility management includes cell handover or cell reselection.

[0140] That is, the public part information is for the terminal devices to be switched and / or reselected in the at least one area. In the scenario of cell switching / cell reselection mainly triggered by network mobility, the terminal devices to be switched and / or reselected in the one or more areas are usually groups of terminal devices, hereinafter referred to as terminal device groups or UE groups, etc. In other words, the public part information may include the public information of the terminal device group to be switched and / or reselected in the at least one area; the dedicated part information may include the dedicated information of each terminal device in the terminal device group to be switched and / or reselected in the at least one area.

[0141] Exemplarily, the first information may include at least one of the following information:

[0142] The interface (F1) between the second node and at least one node includes an identification ID(s) of an application protocol (AP), a common measurement configuration (Common-MeasConfig), a common cell group configuration (CellGroupConfig), a common radio bearer configuration (Common-RadioBearerConfig), and a common synchronization reconfiguration (Common-ReconfigurationWithSync). The at least one node includes the first node.

[0143] Among them, the public measurement configuration may include the periodicity and length (duration) of the synchronization signal and physical broadcast channel (PBCH) block (SSB) measurement timing configuration (SMTC), for example, the maximum period of SMTC is 160ms, and the public measurement configuration may also include the reference position of the second node, the measurement priority of at least one area corresponding to the second node and other information; the public cell group configuration may be used to configure the primary cell group or the secondary cell group; the public radio bearer configuration may be used to configure the public signaling bearer (SRB) (such as SRB0, SRB1 and SRB2, etc.) and data bearer configuration; the public synchronization reconfiguration may include the time domain configuration of the corresponding access opportunity (RACH occasion, RO) of the switching, for example, the physical random access channel (physical random access channel) accesschannel, PRACH) configuration index (prach-configurationIndex), preamble, msg1-FDM factor in the frequency domain (used to indicate the number of ROs configured in the frequency domain, that is, the number of ROs contained in the same time domain resources), the public validity period or timer of the F1-AP, etc.

[0144] The second information may include at least one of the following information:

[0145] The dedicated measurement configuration (Dedicated-MeasConfig) of the first terminal device, the dedicated cell group configuration (Dedicated-CellGroupConfig) of the first terminal device, the dedicated radio bearer configuration (RadioBearerConfig) of the first terminal device, and the dedicated synchronization reconfiguration (Dedicated-ReconfigurationWithSync) of the first terminal device.

[0146] Exemplarily, Dedicated-MeasConfig is used to configure multiple SMTCs and SMTC periodic extension factors. Dedicated-MeasConfig may include SMTC-offset to solve the problem of delay difference in measurements between different satellites / cells. Dedicated-MeasConfig may also include ephemeris information of different adjacent satellites at different times; Dedicated-ReconfigurationWithSync may include expansion factors of multiple ROs and the number of RO consecutive frames to adapt to the non-uniform access requirements of different cells or wave positions, and the offset of the public validity period of the F1-AP; Common-RadioBearerConfig may be used to configure dedicated signaling bearers (such as SRB2 and SRB3 dedicated to the first terminal device, etc.).

[0147] In a possible implementation, the first information may be determined by the second node; the second information may be determined by the first node, and the second information is related to the area where the first terminal device is currently located (the serving cell of the terminal device, or the cell or wave position where the terminal device is currently located). For example, for cells with different frequencies, the second information of the terminal device may be different. "Determine" may be replaced by "generate".

[0148] The first node described above may be a node in an NTN communication scenario, and the first node may be used to carry part or all of the functions of a gNB-DU; the second node may be a node or a ground station in an NTN communication scenario, and the second node may be used to carry part or all of the functions of a gNB-CU. Taking a satellite communication scenario as an example, the first node may be a first satellite, and the second node may be a second satellite or a ground station corresponding to the first satellite.

[0149] In one possible scenario, the second node corresponds to at least one geographical area, or different geographical areas can be identified by the second node it serves; the second node corresponds to at least one node. Exemplarily, the second node corresponding to at least one node can be understood as: a geographical area corresponding to the second node can be served by at least one node, or the geographical area includes at least one area (e.g., cell or wave position) corresponding to each node in at least one node.

[0150] Figure 6 Shown is a schematic diagram of the service range of a first node and a second node.

[0151] like Figure 6 As shown, the second node includes gNB-CU#1 and gNB-CU#2, wherein the geographical area served by gNB-CU#1 (e.g., GeographicalAreaSet#1) includes at least one wave position (e.g., wave positions bw#1 to bw#12), and the at least one wave position is served by satellite #1 (an example of at least one node corresponding to the second node); the geographical area served by gNB-CU#2 (e.g., GeographicalAreaSet#2) includes at least one wave position (e.g., wave positions bw#13 to bw#25) which can be served by satellite #2 and satellite #3 (an example of at least one node corresponding to the second node).

[0152] S520: The first terminal device executes a mobility management process within the area served by the first node based on the first information and the second information.

[0153] Exemplarily, when the first node or the first terminal device moves, the mobility process of the first terminal device in the area served by the first node may be triggered. The first terminal device measures the candidate area based on the first information and the second information to obtain a measurement report. The candidate area may be the area served by the first node, and the measurement report may be used to characterize the signal quality of the candidate area. The first terminal device sends the measurement report to the first node so that the first section determines to execute the mobility management process. The specific process of the first terminal device and the first node executing the mobility process can be referred to. Fig. 9 Description in .

[0154] S530: The first node sends the updated second information to the first terminal device.

[0155] The updated second information corresponds to the area where the terminal device is located after the switching.

[0156] Taking the second information including Dedicated-ReconfigurationWithSync as an example, the expansion factors and RO continuous frames of multiple ROs included in Dedicated-ReconfigurationWithSync corresponding to the area where the terminal device is located after switching may be different from the expansion factors and RO continuous frames of multiple ROs included in Dedicated-ReconfigurationWithSync corresponding to the area where the terminal device is located before switching.

[0157] That is, when the first terminal device moves from one area served by the first node to another area through the mobility management process, the first node can only send the updated second information to the first terminal device, or in other words, the first node can send the updated second information to the first terminal device without sending the first information, thereby saving signaling overhead in the mobility management process.

[0158] It should be understood that the above describes the solution of the present application by taking the mobility management process including cell switching as an example, and the mobility management process mentioned in the embodiments of the present application may also be cell reselection, without limitation.

[0159] Based on the above scheme, by dividing the information of the terminal device to be switched and / or reselected into public part information and dedicated part information, and in the mobility management process of the terminal device switching / reselecting from one area of ​​a node to another area, only updating the dedicated part information of the terminal device, the signaling overhead in the mobility management process of the terminal device can be reduced.

[0160] Optionally, the method further comprises:

[0161] S501: A second node sends the first information to a first node. Correspondingly, the first node receives the first information from the second node.

[0162] Exemplarily, in the initial access process of the first terminal device, the second node sends the first information to the first node. The initial access process can be specifically referred to Figure 8 Description.

[0163] Figure 7 The figure shows a schematic flow chart of a communication method 700 provided by the present application. The method can be applied to a terminal device at a second node (for example, Figure 6 gNB-CU#2 in the example Figure 6 In the process of performing cell switching / or cell reselection between satellite #2 and satellite #3 in the example, the different node corresponding to the second node can be understood as the geographical area served by the second node including the area served by the different node. The method may include the following steps.

[0164] S710: The first node sends first information and second information to a first terminal device. Correspondingly, the first terminal device receives the first information and second information from the first node.

[0165] The first node, the second node, the first terminal device, the first information, and the second information may refer to the description in S510.

[0166] S720: The first terminal device performs a mobility management process from the area served by the first node to the first area based on the first information and the second information.

[0167] The first area is an area served by a third node. The third node may be one of at least one node corresponding to the second node, and exemplarily, the third node is a third satellite.

[0168] Exemplarily, when the first node or the first terminal device moves, a mobility process from the area served by the first node to the first area of ​​the first terminal device may be triggered. The first terminal device measures the candidate area based on the first information and the second information to obtain a measurement report. The candidate area may include the area served by the first node and the first area. The measurement report can be used to characterize the signal quality of the candidate area. The first terminal device sends the measurement report to the first node so that the first section determines to execute the mobility management process. The specific process of the first terminal device, the first node and the third node executing the mobility process can be referred to. Fig.10 Description in .

[0169] S730: The third node sends third information to the first terminal device. Correspondingly, the first terminal device receives the third information from the third node.

[0170] The third information includes dedicated information for mobility management of the first terminal device. The third information corresponds to the first area, and the third information can be determined by the third node.

[0171] Exemplarily, the third information may include a dedicated measurement configuration (Dedicated-MeasConfig) of the first terminal device, a dedicated cell group configuration (Dedicated-CellGroupConfig) of the first terminal device, a dedicated radio bearer configuration (RadioBearerConfig) of the first terminal device, and a dedicated synchronization reconfiguration (Dedicated-ReconfigurationWithSync) of the first terminal device.

[0172] Taking the third information including Dedicated-MeasConfig as an example, the correspondence between the third information and the third node can be understood as: the SMTC period extension factor included in the Dedicated-MeasConfigSMTC corresponding to the third node may be different from the SMTC period extension factor included in the Dedicated-MeasConfigSMTC corresponding to the first node.

[0173] For example, the service cell of the terminal device is the cell (e.g., cell#1) of satellite#1 (an example of the first node), and the Dedicated-MeasConfig for the cell#1 may include the ephemeris information of satellite#1. If the terminal device switches from cell#1 to cell#2 (the cell of satellite#2), the Dedicated-MeasConfig for the cell#2 may include the ephemeris information of satellite#2 (an example of the third node). Accordingly, the SMTC-offset corresponding to the cell is also different, such as the SMTC-offset-1 of cell#1 is 1ms, and the SMTC-offset-2 of celll#2 is 1.2ms.

[0174] That is, when executing the mobility management process of the first terminal device from the area served by the first node to the first area (an example of at least one area served by the third node), the third node can only send the dedicated part information of the first terminal device to the first terminal device, or in other words, the third node can send the dedicated part information of the first terminal device to the first terminal device without sending the public part information.

[0175] In addition, the common part information and the dedicated part information of different networks can be configured in a differential manner. Specifically, a reference common part information (recorded as Reference RRC-P1) and / or a reference dedicated part information (recorded as Reference RRC-P2) can be configured for the terminal device, as well as one or more differential configurations relative to the reference part information, for example, the differential configuration corresponding to the reference common part information is recorded as delta RRC-P1, and the differential configuration corresponding to the reference dedicated part information is recorded as delta RRC-P2. When a network device (e.g., a first node or a third node) needs to configure common part information or dedicated part information for a terminal device (e.g., a first terminal device), different Reference RRCs and / or delta RRCs can be indicated.

[0176] Based on the above scheme, by dividing the information of the terminal device to be switched and / or reselected into public part information and dedicated part information, and in the mobility management process from one node to another of the terminal device, only updating the dedicated part information of the terminal device, the signaling overhead in the mobility management process of the terminal device can be reduced.

[0177] Optionally, the method further comprises:

[0178] S701: A second node sends the first information to a first node. Correspondingly, the first node receives the first information from the second node.

[0179] For details, please refer to the description in S501.

[0180] Figure 8 This application provides an initial access method, which may include the following steps.

[0181] S801, UE sends an RRC Setup Request message to gNB-DU#1. In response, gNB-DU receives the RRC Setup Request message from the UE.

[0182] The RRC establishment request message includes the location information of the UE.

[0183] For example, the UE's location information can be determined through its own global navigation satellite system (GNSS) information, or the UE's location information includes information about the UE's geographical location, such as the UE's beam information, beam identification information, beam position information, beam position related identification information, or longitude and latitude information.

[0184] S802, gNB-DU#1 sends information #1 to gNB-CU. Correspondingly, gNB-CU receives information #1 from gNB-DU#1.

[0185] This information #1 includes RRC-P1 information of UE (an example of second information).

[0186] Optionally, the RRC-P1 information includes an ID (dedicated ID) used by the UE within the service range of the gNB-CU, and the dedicated ID may include geographic location information. The dedicated ID information is unique within the service range of the gNB-CU.

[0187] Optionally, the information #1 also includes underlying configuration information, and the underlying configuration information includes configuration information of the physical layer and / or the medium access control (MAC) layer.

[0188] Exemplarily, gNB-DU#1 sends information #1 to gNB-CU via the INITIAL UL RRC MESSAGE TRANSFER message.

[0189] S803, gNB-CU sends information #2 to gNB-DU#1. Correspondingly, gNB-DU#1 receives information #2 from gNB-CU.

[0190] The information #2 may include the RRC-P2 information of the UE (an example of the first information). Optionally, the information #2 may include information related to the F1-AP ID and at least one item of the interface information between the gNB-CU and the gNB-DU #1.

[0191] Among them, the information related to F1-AP ID may include information related to the validity period / timer of F1-AP ID, or the update mechanism of F1-AP ID triggered by the location change of gNB-DU#1.

[0192] Exemplarily, the gNB-CU sends information #2 to the gNB-CU via a downlink RRC message transfer (DL RRC MESSAGE TRANSFER) message.

[0193] S804, gNB-DU#1 sends RRC Setup information to the UE. Correspondingly, the UE receives the RRC Setup information from gNB-DU#1.

[0194] Exemplarily, the RRCSetup information may include the dedicated part information and the public part information of the UE included in the information #1 and the information #2.

[0195] S805: UE sends an RRC connection setup complete (RRCSetupComplete) message to gNB-DU#1. In response, gNB-DU#1 receives an RRC connection setup complete (RRCSetupComplete) message from the UE.

[0196] Exemplarily, after the RRC connection establishment is completed, the UE sends an RRC connection establishment complete message to gNB-DU#1.

[0197] S806: gNB-DU#1 sends an uplink RRC message transfer (UL RRC MESSAGE TRANSFER) message to gNB-CU. Accordingly, gNB-CU receives the UL RRC MESSAGE TRANSFER message from gNB-DU#1.

[0198] The UL RRC MESSAGE TRANSFER message may include an RRC connection establishment complete message.

[0199] S807, gNB-CU sends an INITIAL UE MESSAGE message to AMF. Correspondingly, AMF receives the INITIAL UE MESSAGE message from gNB-CU.

[0200] The INITIAL UE MESSAGE may carry the location information of the UE.

[0201] S808: AMF sends an initial UE context setup request (INITIAL CONTEXT SETUP REQUEST) message to the gNB-CU. Accordingly, the gNB-CU receives the INITIAL CONTEXT SETUP REQUEST message from the AMF.

[0202] S809: gNB-CU sends a UE CONTEXT SETUP REQUEST message to gNB-DU#1. In response, gNB-DU#1 receives the UE CONTEXT SETUP REQUEST message from gNB-CU.

[0203] The UE context establishment request message may be used to request the establishment of SRB and DRB bearers.

[0204] S810, gNB-DU#1 sends a SecurityModeCommand message to the UE.

[0205] The SecurityModeCommand message may carry security algorithm configuration (securityAlgorithmConfig).

[0206] S811, gNB-DU#1 sends a UE CONTEXT SETUP RESPONSE message to gNB-CU.

[0207] S812. The UE sends a SecurityModeComplete message to gNB-DU#1.

[0208] The SecurityModeComplete message is used to confirm that the security mode command is completed.

[0209] S813, gNB-DU#1 sends an UL RRC MESSAGE TRANSFER message to gNB-CU.

[0210] gNB-DU#1 can carry the SecurityModeComplete message to gNB-CU through the UL RRC MESSAGE TRANSFER message.

[0211] The UL RRC MESSAGE TRANSFER message may also include RRC-P1 of the UE (an example of the second information).

[0212] S814, gNB-CU sends a DL RRC MESSAGE TRANSFER message to gNB-DU#1.

[0213] The DL RRC MESSAGE TRANSFER message includes an RRC reconfiguration message, which includes RRC-P2 (an example of the first information). RRC-P2 may include public measurement configuration, public cell group configuration, public radio bearer configuration, and public synchronization reconfiguration in the group / or geographical area where the UE is located.

[0214] Exemplarily, after receiving RRC-P1 from gNB-DU#1, the gNB-CU sends the RRC-P2 to gNB-DU#1 via the DL RRC MESSAGETRANSFER message.

[0215] S815, gNB-DU#1 sends the RRCReconfiguration message to the UE.

[0216] The RRCReconfiguration message may include RRC-P1 and RRC-P2.

[0217] S816. The UE sends an RRCReconfigurationComplete message to gNB-DU#1.

[0218] S817: gNB-DU#1 sends a UL RRC MESSAGE TRANSFER message to gNB-CU. In response, gNB-CU receives the UL RRC MESSAGE TRANSFER message from gNB-DU#1.

[0219] Exemplarily, gNB-DU#1 encapsulates the RRC message in a UL RRC MESSAGE TRANSFER and sends it to the gNB-CU. The RRC message may be an RRCReconfigurationComplete message.

[0220] S818: gNB-CU sends an INITIAL CONTEXT SETUP RESPONSE message to AMF. In response, AMF receives the INITIAL CONTEXT SETUP RESPONSE message from gNB-CU.

[0221] Based on the above initial process scheme, gNB-DU#1 (an example of the first node) can receive the first information from gNB-CU (an example of the second node); thereby gNB-DU#1 sends the first information and the second information to UE (an example of the first terminal device).

[0222] Combine the following Fig. 9 and Fig.10 , the communication method 500 and the method 700 provided in the present application are described in detail by taking the switching of the terminal device between different areas or different nodes of the same node as an example. It can be understood that Fig. 9 and Fig.10 The embodiments shown are respectively Figure 5 and Figure 7 The communication method provided in the present application is described based on the embodiments shown in the drawings. The embodiments can be referenced to each other. Figure 5 and Figure 7 The contents described in the illustrated embodiment will not be repeated. Fig. 9 and Fig.10 The illustrated embodiment is described with UE as the first terminal device, gNB-DU#1 as the first node, gNB-CU as the second node, and gNB-DU#3 as the third node.

[0223] Fig. 9 9 is a schematic flow chart of a communication method 900 provided by the present application. The method may include the following steps.

[0224] S901, gNB-CU sends RRC-P2 information (an example of the first information) to UE. Correspondingly, UE receives RRC-P2 information from gNB-CU.

[0225] Exemplarily, the gNB-CU sends RRC-P2 information to the UE via an RRC reconfiguration message, that is, the RRC-P2 information may be carried in the RRC reconfiguration message. The RRC-P2 information may include public measurement configuration information.

[0226] The measurement configuration information includes information required for measuring the candidate cell, for example, the measurement configuration information may include measurement objects and measurement reporting configurations. Optionally, the measurement configuration information may also include measurement identities, quantity configurations, measurement gaps, and other information.

[0227] The measurement target is used to identify the candidate cell that the UE needs to measure, that is, the cell to be measured. The cell to be measured may also be referred to as the target cell. The measurement target may include the identifiers of one or more candidate cells. For example, if the measurement target includes the identifiers of Cell 1 and Cell 2, it means that the measurement target of the UE is Cell 1 and Cell 2, or the UE needs to measure the signal strength of Cell 1 and Cell 2.

[0228] The measurement report configuration information may include a reporting criterion. That is, when the measurement result of a candidate cell meets the reporting criterion, the UE may report the measurement report of the candidate cell. For example, the reporting criterion may be that the signal strength of the candidate cell is greater than or equal to a threshold value.

[0229] Optionally, the measurement report configuration information may further include measurement parameter information, where the measurement parameter information is used to indicate the measurement results of which parameters need to be included in the measurement report.

[0230] The measurement identifier can be used to associate a measurement object with a measurement report configuration information. By configuring multiple measurement identifiers, multiple measurement objects can be associated with one measurement report configuration, or multiple measurement report configurations can be associated with one measurement object.

[0231] The quantity configuration may indicate the number of cells included in the measurement report by the UE. For example, the quantity configuration indicates that the UE includes the measurement results of 2 cells in the measurement report. In this case, the UE may carry the measurement results of the two candidate cells with the highest signal strength in the measurement report.

[0232] The measurement gap may indicate a period at which the UE performs measurement. For example, the measurement gap indicates that the period at which the UE performs measurement is 30 seconds, and the UE measures the signal of the candidate cell once every 30 seconds.

[0233] S902. The UE sends an RRC Reconfiguration Complete message to the gNB-CU.

[0234] Exemplarily, the UE receives an RRC reconfiguration message from the gNB-CU, and after completing the RRC reconfiguration, sends an RRC reconfiguration complete message to the gNB-CU.

[0235] S903, UE sends a neighbor cell measurement report to gNodeB-DU#1.

[0236] Exemplarily, the UE measures the candidate cell according to the measurement configuration information in S901, and sends a measurement report of the target cell to the gNodeB-DU according to the measurement report configuration information. The measurement report may carry the PCI of the target cell.

[0237] Among them, gNodeB-DU#1 is the gNodeB-DU serving the UE, or the UE is located in a cell served by gNodeB-DU#1. The UE sends a neighbor measurement report to gNodeB-DU#1, that is, this part of the message does not need to be transmitted to the gNB-CU.

[0238] S904, gNodeB-DU#1 determines whether to perform cell switching for the UE.

[0239] Exemplarily, after receiving the measurement report from the UE, gNodeB-DU#1 decides whether to perform cell switching for the UE based on the measurement report.

[0240] For example, gNodeB-DU#1 receives a measurement report of Cell 1 (an example of a target cell) from the UE, and the measurement report includes the measurement result of the signal strength of Cell 1. gNodeB-DU#1 determines whether the measurement result of Cell 1 meets the switching condition, which is a condition for determining whether the UE can be switched from the serving cell to the candidate cell. The switching condition is, for example, that the signal strength of the candidate cell is greater than a set threshold value. If the measurement result of Cell 1 meets the switching condition, gNodeB-DU#1 can decide to perform a cell switching for the UE, or switch the UE to Cell 1, or switch the serving cell of the UE to Cell 1.

[0241] When gNodeB-DU#1 decides to perform cell handover for the UE based on the measurement report, gNodeB-DU#1 determines whether the target cell and the serving cell belong to the same gNodeB-DU based on the PCI of the target cell carried in the measurement report. If they belong to the same gNodeB-DU, the intra-site handover process is started; if they do not belong to the same gNodeB-DU, the inter-site handover process is started.

[0242] S905, gNodeB-DU#1 sends the cell switching decision result to gNodeB-CU.

[0243] Exemplarily, the cell switching decision result may be switching from one cell (serving cell) served by gNodeB-DU#1 to another cell (target cell).

[0244] S906, gNodeB-CU sends a UE CONTEXT SETUP REQUEST message to gNodeB-DU#1. Correspondingly, gNodeB-DU receives the UE CONTEXT SETUP REQUEST message from gNodeB-CU.

[0245] The UE CONTEXT SETUP REQUEST message is used to apply for user resources for the target cell.

[0246] S907, gNodeB-DU#1 sends a UE CONTEXT SETUPRESPONSE message to gNodeB-CU. Correspondingly, gNodeB-CU receives a UE CONTEXT SETUPRESPONSE message from gNodeB-DU#1.

[0247] Exemplarily, after successful resource allocation, gNodeB-DU#1 sends a UE CONTEXT SETUPRESPONSE message to gNodeB-CU.

[0248] S908, gNodeB-CU sends a UE CONTEXT MODIFICATION REQUEST message to gNodeB-DU#1. Correspondingly, gNodeB-DU#1 receives the UE CONTEXT MODIFICATION REQUEST message from gNodeB-CU.

[0249] Among them, UE CONTEXT MODIFICATION REQUEST is used to instruct the gNodeB-DU to stop scheduling layer 2 (layer2, L2) of the source cell (serving cell).

[0250] S909, gNodeB-DU#1 sends a UE CONTEXT MODIFICATION RESPONSE message to gNodeB-CU. Correspondingly, gNodeB-CU receives the UE CONTEXT MODIFICATION RESPONSE message sent by gNodeB-DU#1.

[0251] S910, gNodeB-CU sends RRC-P1 information (an example of the second information) to the UE.

[0252] Exemplarily, the gNodeB-CU sends RRC-P1 information to the UE via an RRCReconfiguration message.

[0253] Optionally, RRCReconfiguration also includes a target frequency for switching, a PCI, a cell radio network temporary identify (CRNTI) and a dedicated preamble configured for the UE.

[0254] S911, the UE initiates a non-contention random access MSG1 message in the target cell.

[0255] For example, the MSG1 carries a dedicated preamble.

[0256] S912, gNodeB-DU#1 sends MSG2 message to UE.

[0257] S913, the UE sends an RRC reconfiguration completion (RRCReconfigurationComplete) message to the gNodeB-CU.

[0258] Exemplarily, RRCReconfigurationComplete is used to notify the UE to access the target cell.

[0259] S914, gNodeB-CU sends a UE CONTEXT RELEASE COMMAND message to gNodeB-DU#1.

[0260] Exemplarily, after receiving the message, gNodeB-DU#1 releases the UE in the source cell.

[0261] S915, after switching to the target cell, gNodeB-DU#1 sends an updated RRC-P1 message to the UE through RRCReconfiguration.

[0262] Exemplarily, the updated RRC-P1 may include measurement configuration information of the target cell, and details may refer to the description in S510.

[0263] Fig.10 1 is a schematic flow chart of a communication method 1000 provided by the present application. The method may include the following steps.

[0264] S1001, gNB-CU sends RRC-P2 information (an example of the first information) to UE. Correspondingly, UE receives RRC-P1 from gNB-CU.

[0265] Exemplarily, the gNB-CU sends the RRC-P1 to the UE through gNB-CU#1, and RR-P1 can refer to the description in S901.

[0266] S1002, gNB-DU#1 sends RRC-P1 information (an example of the second information) to the UE. Correspondingly, the UE receives the RRC-P1 information from gNB-DU#1.

[0267] RRC-P1 may include measurement configuration information. The measurement configuration information may include one or more of the following information: measurement configuration related to broadcast signal (based on SSB) measurement, such as SMTC cycle, SMTC duration, SMTC offset, etc. of the serving cell and the neighboring cell, measurement priority, location and distance threshold of the reference point of the current cell and the neighboring cell, service time, etc.

[0268] S1003, UE sends a neighboring cell measurement report to gNB-DU#1. Correspondingly, gNB-DU#1 receives the neighboring cell measurement report from the UE.

[0269] For this step, please refer to the description of S903.

[0270] S1004, gNB-DU#1 sends a handover request to gNB-DU#2. Accordingly, gNB-DU#2 receives the handover request from gNB-DU#1.

[0271] Exemplarily, when gNB-DU#1 determines that the UE meets the switching conditions based on the neighboring cell measurement report, and the target cell for switching is the cell served by gNB-DU#2, gNB-DU#1 sends the switching request to gNB-DU#2.

[0272] S1005, gNB-DU#2 sends a handover request response message to gNB-DU#1. Correspondingly, gNB-DU#1 receives the handover request response message from gNB-DU#2.

[0273] S1006, gNB-DU#1 sends RRC-P1 information to UE. Correspondingly, UE receives RRC-P1 information from gNB-DU#1.

[0274] The RRC-P1 information may indicate subsequent handover related resources and a conditional handover (CHO) trigger condition, such as that the satellite signal quality is greater than or equal to a preset threshold.

[0275] S1007, gNB-DU#1 and gNB-DU#2 exchange UE context information.

[0276] Exemplarily, gNB-DU#1 and gNB-DU#2 exchange UE context information via an inter-satellite link (ISL).

[0277] S1008, the UE initiates a random access request to gNB-DU#2. Accordingly, gNB-DU#2 receives the random access request from the UE.

[0278] S1009, gNB-DU#2 sends a random access response message to the UE. Correspondingly, the UE receives the random access response message from gNB-DU#2.

[0279] S1010, gNB-DU#2 sends a path switch request message to gNB-CU. The gNB-CU receives the path switch request message from gNB-DU#2.

[0280] Exemplarily, the path switching request message is used to request switching of a user plane path of the UE.

[0281] S1011, gNB-CU returns a path switch request response message to gNB-DU#2. gNB-DU#2 receives the path switch request response message from gNB-CU.

[0282] S1012, gNB-DU#2 sends indication information to gNB-DU#1, where the indication information indicates to release the context information of the UE. Accordingly, gNB-DU#1 receives the indication information from gNB-DU#2.

[0283] S1013, gNB-DU#2 sends RRC-P1 information (an example of the third information) to the UE. Accordingly, the UE receives the RRC-P1 information from gNB-DU#2.

[0284] The third information may refer to the description in S720.

[0285] S1014, UE returns an RRC-P1 configuration success response to gNB-DU#2. Accordingly, gNB-DU#2 receives an RRC-P1 configuration success response from the UE.

[0286] Combination of the above Figures 5 to 10 The method of the embodiment of the present application is described in detail below. Figures 11 to 13 The device of the embodiment of the present application is described in detail. It should be noted that: Figures 11 to 13The device shown can implement each step in the above method, and for the sake of brevity, it will not be described again here.

[0287] Fig.11 1 is a schematic block diagram of a communication device 1000 provided in an embodiment of the present application. Fig.11 As shown, the communication device 1000 may include: a transceiver unit 1010 and a processing unit 1020 .

[0288] In one possible design, the communication device 1000 may be the first node in the above method embodiment, or may be a chip for implementing the function of the first node in the above method embodiment.

[0289] It should be understood that the communication device 1000 may correspond to the first node in the method 500 or the method 700 of the embodiment of the present application, or to the gNB-DU#1 in the methods 800 to 1000 of the embodiments of the present application, and the communication device 1000 may include a unit for executing the method executed by the first node in the method 500 or the method 700, or a unit for the method executed by the gNB-DU#1 in the method 900 or the method 1000. In addition, each unit in the communication device 1000 and the above-mentioned other operations and / or functions are respectively for implementing the corresponding processes of the methods 500 to 1000. It should be understood that the specific process of each unit executing the above-mentioned corresponding steps has been described in detail in the above-mentioned method embodiment, and for the sake of brevity, it will not be repeated here.

[0290] In another possible design, the communication device 1000 may be the second node in the above method embodiment, or may be a chip for implementing the function of the first node in the above method embodiment.

[0291] It should be understood that the communication device 1000 may correspond to the second node in the method 500 or the method 700 of the embodiment of the present application, or to the gNB-CU in the methods 800 to 1000 of the embodiments of the present application, and the communication device 1000 may include a unit for executing the method executed by the second node in the method 500 or the method 700, or include a unit for the method executed by the gNB-CU in the method 900 or the method 1000. In addition, each unit in the communication device 1000 and the above-mentioned other operations and / or functions are respectively for implementing the corresponding processes of the methods 500 to 1000. It should be understood that the specific process of each unit executing the above-mentioned corresponding steps has been described in detail in the above-mentioned method embodiment, and for the sake of brevity, it will not be repeated here.

[0292] In another possible design, the communication device 1000 may be the third node in the above method embodiment, or may be a chip for implementing the function of the third node in the above method embodiment.

[0293] It should be understood that the communication device 1000 may correspond to the first node in the method 500 or the method 700 of the embodiment of the present application, or to the gNB-DU#2 in the methods 800 to 1000 of the embodiments of the present application, and the communication device 1000 may include a unit for executing the method executed by the first node in the method 500 or the method 700, or a unit for the method executed by the gNB-DU#2 in the method 900 or the method 1000. In addition, each unit in the communication device 1000 and the above-mentioned other operations and / or functions are respectively for implementing the corresponding processes of the methods 500 to 1000. It should be understood that the specific process of each unit executing the above-mentioned corresponding steps has been described in detail in the above-mentioned method embodiment, and for the sake of brevity, it will not be repeated here.

[0294] In another possible design, the communication device 1000 may be the first terminal device in the above method embodiment, or may be a chip for implementing the function of the first device in the above method embodiment.

[0295] It should be understood that the communication device 1000 may correspond to the first terminal device in the method 500 or the method 700 of the embodiment of the present application, or correspond to the UE in the method 800 to the method 1000 of the embodiment of the present application, and the communication device 1000 may include a unit for executing the method executed by the first terminal device in the method 500 or the method 700, or include a unit of the method executed by the UE in the method 900 or the method 1000. In addition, each unit in the communication device 1000 and the above-mentioned other operations and / or functions are respectively for implementing the corresponding processes of the method 500 to the method 1000. It should be understood that the specific process of each unit executing the above-mentioned corresponding steps has been described in detail in the above-mentioned method embodiment, and for the sake of brevity, it will not be repeated here.

[0296] It should also be understood that the transceiver unit 1010 in the communication device 1000 may correspond to Fig.12 The transceiver 2020 in the communication device 2000 shown in FIG. 1 may correspond to the processing unit 1020 in the communication device 1000. Fig.12 The processor 2010 in the communication device 2000 shown in FIG.

[0297] It should also be understood that when the communication device 1000 is a chip, the chip includes a transceiver unit. Optionally, the chip may also include a processing unit. The transceiver unit may be an input / output circuit or a communication interface; the processing unit may be a processor or a microprocessor or an integrated circuit integrated on the chip.

[0298] The transceiver unit 1010 is used to implement the signal transceiver operation of the communication device 1000, and the processing unit 1020 is used to implement the signal processing operation of the communication device 1000.

[0299] Optionally, the communication device further includes a storage unit 1030, and the storage unit 1030 is used to store instructions.

[0300] Fig.12 2 is a schematic block diagram of a communication device 2000 provided in an embodiment of the present application. Fig.12 As shown, the communication device 2000 includes: at least one processor 2010 and a transceiver 2020. The processor 2010 is coupled to a memory and is used to execute instructions stored in the memory to control the transceiver 2020 to send and / or receive signals. Optionally, the communication device 2000 also includes a memory 2030 for storing instructions.

[0301] It should be understood that the processor 2010 and the memory 2030 can be combined into one processing device, and the processor 2010 is used to execute the program code stored in the memory 2030 to implement the above functions. In specific implementation, the memory 2030 can also be integrated into the processor 2010, or independent of the processor 2010.

[0302] It should also be understood that the transceiver 2020 may include a receiver (or receiver) and a transmitter (or transmitter). The transceiver 2020 may further include an antenna, and the number of antennas may be one or more. The transceiver 2020 may also be an antenna interface or an interface circuit.

[0303] When the communication device 2000 is a chip, the chip includes a transceiver unit and a processing unit, wherein the transceiver unit may be an input / output circuit or a communication interface; and the processing unit may be a processor or a microprocessor or an integrated circuit integrated on the chip.

[0304] Fig.13 Schematic diagram of a chip system according to an embodiment of the present application. The chip system here may also be a system composed of circuits. Fig.13 The chip system 3000 shown includes: a logic circuit 3010 and an input / output interface (input / output interface) 3020, wherein the logic circuit is used to couple with the input interface and transmit data through the input / output interface to execute Figure 5 , Figure 7 , Figure 8 , Fig. 9 or Fig.10 The method described.

[0305] The present application also provides a processing device, including a processor and an interface. The processor can be used to execute the method in the above method embodiment.

[0306] It should be understood that the above-mentioned processing device can be a chip. For example, the processing device can be a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on chip (SoC), a central processor unit (CPU), a network processor (NP), a digital signal processor (DSP), a micro controller unit (MCU), a programmable logic device (PLD) or other integrated chips.

[0307] In the implementation process, each step of the above method can be completed by an integrated logic circuit of hardware in a processor or an instruction in the form of software. The steps of the method disclosed in conjunction with the embodiment of the present application can be performed by a hardware processor, or by a combination of hardware and software modules in a processor. The software module can be located in a random register, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, and other mature storage media in the art. The storage medium is located in a memory, and the processor reads the information in the memory, and completes the steps of the above method in conjunction with its hardware. To avoid repetition, it is not described in detail here.

[0308] It should be noted that the processor in the embodiment of the present application can be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method embodiment can be completed by an integrated logic circuit of hardware in the processor or an instruction in the form of software. The above processor can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The disclosed methods, steps and logic block diagrams in the embodiments of the present application can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc.

[0309] It can be understood that the memory in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile storage can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory can be a random access memory (RAM), which is used as an external cache.

[0310] According to the method provided in the embodiment of the present application, the present application also provides a computer program product, which includes: a computer program code, when the computer program code is run on a computer, the computer executes Figure 5 , Figure 7 , Figure 8 , Fig. 9 or Fig.10 The method described.

[0311] According to the method provided in the embodiment of the present application, the present application also provides a computer-readable storage medium, which stores a program code, and when the program code is run on a computer, the computer executes Figure 5 , Figure 7 , Figure 8 , Fig. 9 or Fig.10 The method described.

[0312] According to the method provided in the embodiment of the present application, the present application also provides a system, which includes the aforementioned access network device and the first device. Optionally, the system also includes a fusion management function network element and / or a target network computing power fusion function node.

[0313] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or a data center that includes one or more available media integrated. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a high-density digital video disc (digital video disc, DVD)), or a semiconductor medium (e.g., a solid state drive (solid state disc, SSD)), etc.

[0314] In the several embodiments mentioned in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0315] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A communication method, characterized in that: include: The first terminal device receives first information and second information from the first node, the first information including public information for performing mobility management on at least one terminal device in at least one area corresponding to the second node, the second information including dedicated information for performing mobility management on the first terminal device, the at least one area including an area served by the first node, and the at least one terminal device including the first terminal device; The first terminal device performs a mobility management process within an area served by the first node based on the first information and the second information; The first terminal device receives the updated second information from the first node.

2. The method according to claim 1, characterized in that The first node is a first satellite, and the second node is a second satellite or a ground station corresponding to the first satellite.

3. The method according to claim 1 or 2, characterized in that: The first information includes at least one of the following information: The interface F1 between the first node and at least one node applies the identification of the protocol AP, the common measurement configuration, the common cell group configuration, the common radio bearer configuration, and the common synchronization reconfiguration; wherein the at least one node includes the first node; And, the second information includes at least one of the following information: A dedicated measurement configuration of the first terminal device, a dedicated cell group configuration of the first terminal device, a dedicated radio bearer configuration of the first terminal device, and a dedicated synchronization reconfiguration of the first terminal device.

4. The method according to claim 3, characterized in that The public measurement configuration includes at least one of the following information: A measurement timing configuration SMTC based on a synchronization signal block, location information of the second node, and a measurement priority of the at least one area; And, the common synchronous reconfiguration includes at least one of the following information: The time domain configuration, preamble code or frequency domain configuration of the access opportunity RO corresponding to the access target area in the mobility management process, and the validity period of the F1 AP.

5. The method according to claim 3, characterized in that: The dedicated measurement configuration includes at least one of the following: A plurality of SMTCs based on synchronization signal blocks, a SMTC period extension factor based on the synchronization signal block measurement timing configuration or a SMTC offset value based on the synchronization signal block measurement timing configuration, and ephemeris information of the first node; And, the dedicated synchronous reconfiguration includes at least one of the following information: The expansion factor and / or number of consecutive frames of the access opportunity RO corresponding to the access target area of ​​the mobility management process, and the offset value of the validity period of the F1 AP.

6. The method according to any one of claims 1 to 5, characterized in that The first terminal device receives the first information and the second information from the first node, including: In an initial access process of the first terminal device, the first terminal device receives the first information and the second information from the first node.

7. A communication method, characterized in that: include: The first node sends first information and second information to a first terminal device, wherein the first information includes public information for performing mobility management on at least one terminal device in at least one area corresponding to the second node, and the second information includes dedicated information for performing mobility management on the first terminal device, the at least one area includes an area served by the first node, and the at least one terminal device includes the first terminal device; The first node performs a mobility management process for the first terminal device in an area served by the first node based on a measurement report, wherein the measurement report is determined based on the first information and the second information; The first node sends the updated second information to the first terminal device.

8. The method according to claim 7, characterized in that The first node is a first satellite, and the second node is a second satellite or a ground station corresponding to the first satellite.

9. The method according to claim 7 or 8, characterized in that: The first information includes at least one of the following information: The interface F1 between the second node and at least one node applies the identification of the protocol AP, the common measurement configuration, the common cell group configuration, the common radio bearer configuration, and the common synchronization reconfiguration; wherein the at least one node includes the first node; And, the second information includes at least one of the following information: A dedicated measurement configuration of the first terminal device, a dedicated cell group configuration of the first terminal device, a dedicated radio bearer configuration of the first terminal device, and a dedicated synchronization reconfiguration of the first terminal device.

10. The method according to claim 9, characterized in that The public measurement configuration includes at least one of the following information: A measurement timing configuration SMTC based on a synchronization signal block, location information of the second node, and a measurement priority of the at least one area; And, the common synchronous reconfiguration includes at least one of the following information: The time domain configuration, preamble code or frequency domain configuration of the access opportunity RO corresponding to the access target area in the mobility management process, and the validity period of the F1 AP.

11. The method according to claim 9, characterized in that The dedicated measurement configuration includes at least one of the following: A plurality of SMTCs based on synchronization signal blocks, a SMTC period extension factor based on the synchronization signal block measurement timing configuration or a SMTC offset value based on the synchronization signal block measurement timing configuration, and ephemeris information of the first node; And, the dedicated synchronous reconfiguration includes at least one of the following information: The expansion factor and / or number of consecutive frames of the access opportunity RO corresponding to the access target area of ​​the mobility management process, and the offset value of the validity period of the F1 AP.

12. The method according to any one of claims 7 to 11, characterized in that The method further comprises: The first node receives the first information from the second node.

13. The method according to claim 12, characterized in that The first node receiving the first information from the second node includes: In an initial access process of the first terminal device, the first node receives the first information from the second node.

14. The method according to any one of claims 7 to 13, characterized in that The first node sends the first information and the second information to the first terminal device, including: In an initial access process of the first terminal device, the first node sends the first information and the second information to the first terminal device.

15. A communication method, characterized in that: include: The first terminal device receives first information and second information from the first node, the first information including public information for performing mobility management on at least one terminal device in at least one area corresponding to the second node, the second information including dedicated information for performing mobility management on the first terminal device, the at least one area including an area served by the first node, and the at least one terminal device including the first terminal device; The first terminal device performs a mobility management process from an area served by the first node to a first area based on the first information and the second information, where the first area is an area served by a third node; The first terminal device receives third information from the third node, where the third information includes dedicated information for mobility management of the first terminal device, the third information is determined by the third node, and the at least one area includes an area served by the third node.

16. The method according to claim 15, characterized in that The first node is a first satellite, the second node is a second satellite or a ground station corresponding to the first satellite, and the third node is a third satellite.

17. The method according to claim 15 or 16, characterized in that The first information includes at least one of the following information: an identifier of an F1 interface application protocol between the second node and at least one node, a common measurement configuration, a common cell group configuration, a common radio bearer configuration, and a common synchronization reconfiguration; Wherein, the at least one node includes the first node and the third node; And, the third information includes at least one of the following information: A dedicated measurement configuration of the first terminal device, a dedicated cell group configuration of the first terminal device, a dedicated radio bearer configuration of the first terminal device, and a dedicated synchronization reconfiguration of the first terminal device.

18. The method according to claim 17, characterized in that The public measurement configuration includes at least one of the following information: A measurement timing configuration SMTC based on a synchronization signal block, location information of the second node, and a measurement priority of the at least one area; And, the common synchronous reconfiguration includes at least one of the following information: The time domain configuration, preamble code or frequency domain configuration of the access opportunity RO corresponding to the access target area in the mobility management process, and the validity period of the F1 AP.

19. The method according to claim 17, characterized in that The dedicated measurement configuration includes at least one of the following: A plurality of SMTCs, an SMTC period extension factor or an SMTC offset value, and ephemeris information of the first node; And, the dedicated synchronous reconfiguration includes at least one of the following information: The expansion factor and / or number of consecutive frames of the access opportunity RO corresponding to the access target area of ​​the mobility management process, and the offset value of the validity period of the F1 AP.

20. The method according to any one of claims 15 to 19, characterized in that The first terminal device receives the first information and the second information from the first node, including: In an initial access process of the first terminal device, the first terminal device receives the first information and the second information from the first node.

21. A communication method, characterized in that: include: The third node executes a mobility management process for a first terminal device from an area served by the first node to a first area, the first area being an area served by the third node, the execution of the mobility management process being determined based on first information and second information, the first information comprising public information for performing mobility management on at least one terminal device in at least one area corresponding to the second node, the second information comprising dedicated information for performing mobility management on the first terminal device, the second information being determined by the first node, the at least one area comprising an area served by the first node and an area served by the third node, and the at least one terminal device comprising the first terminal device; The third node sends third information to the first terminal device, where the third information includes dedicated information for performing mobility management on the first terminal device, and the third information is determined by the third node.

22. The method according to claim 21, characterized in that The first node is a first satellite, the second node is a second satellite or a ground station corresponding to the first satellite, and the third node is a third satellite.

23. The method according to claim 21 or 22, characterized in that The first information includes at least one of the following information: The interface F1 between the second node and at least one node applies the identification of the protocol AP, the common measurement configuration, the common cell group configuration, the common radio bearer configuration, and the common synchronization reconfiguration; Wherein, the at least one node includes the first node and the third node; And, the third information includes at least one of the following information: A dedicated measurement configuration of the first terminal device, a dedicated cell group configuration of the first terminal device, a dedicated radio bearer configuration of the first terminal device, and a dedicated synchronization reconfiguration of the first terminal device.

24. The method according to claim 23, characterized in that The public measurement configuration includes at least one of the following information: A measurement timing configuration SMTC based on a synchronization signal block, location information of the second node, and a measurement priority of the at least one area; And, the common synchronous reconfiguration includes at least one of the following information: The time domain configuration, preamble code or frequency domain configuration of the access opportunity RO corresponding to the access target area in the mobility management process, and the validity period of the F1 AP.

25. The method according to claim 23, characterized in that The dedicated measurement configuration includes at least one of the following: A plurality of SMTCs based on synchronization signal blocks, a SMTC period extension factor based on the synchronization signal block measurement timing configuration or a SMTC offset value based on the synchronization signal block measurement timing configuration, and ephemeris information of the first node; And, the dedicated synchronous reconfiguration includes at least one of the following information: The expansion factor and / or number of consecutive frames of the access opportunity RO corresponding to the access target area of ​​the mobility management process, and the offset value of the validity period of the F1 AP.

26. The method according to any one of claims 21 to 25, characterized in that The first information and the second information are sent by the first node during the initial access process of the first terminal device.

27. A communication device, characterized in that: include: At least one processor, wherein the at least one processor is used to execute a computer program stored in a memory so that the device performs the method as described in any one of claims 1 to 6; or performs the method as described in any one of claims 7 to 14; or performs the method as described in any one of claims 15 to 20; or performs the method as described in any one of claims 21 to 26.

28. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, which, when executed, causes the device to execute the method as described in any one of claims 1 to 6; or execute the method as described in any one of claims 7 to 14; or execute the method as described in any one of claims 15 to 20; or execute the method as described in any one of claims 21 to 26.

29. A chip system, characterized in that: include: A processor, used to call and run a computer program from a memory so that a communication device equipped with the chip system executes a method as described in any one of claims 1 to 6; or executes a method as described in any one of claims 7 to 14; or executes a method as described in any one of claims 15 to 20; or executes a method as described in any one of claims 21 to 26.

30. A communication system, characterized in that: It includes at least one of a first node, a third node and a first terminal device, the first node is used to execute the method as described in any one of claims 1 to 6, the third node is used to execute the method as described in any one of claims 7 to 14, and the first terminal device is used to execute the method as described in any one of claims 15 to 20, or execute the method as described in any one of claims 21 to 26.

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