Communication method and related device

Abstract

The invention relates to the field of communication, and provides a communication method and a related device, in the method, a terminal device can autonomously make a decision of synchronously activating an auxiliary cell according to information configured by a network side in combination with a measurement report, and can directly use a measurement result to synchronously activate the auxiliary cell in a subsequent inter-station switching process, so that the communication efficiency is improved. The network flexibility is improved, and better communication service is provided for the terminal.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of communication, in particular to a communication method and related apparatus. BACKGROUND

[0002] In a mobile communication network, when a terminal device moves from the coverage of one base station to the coverage of another base station, the movement of the terminal device can trigger inter-station handover, which refers to that the source base station and the target base station belong to different network devices. In order to reduce the service interruption and latency of the terminal device during inter-station handover, a layer 1 / layer 2 triggered mobility (LTM) mechanism is proposed.

[0003] In a carrier aggregation (CA) scenario, the serving cells of the terminal device include a primary cell and at least one activated secondary cell. When inter-station handover is performed based on the LTM mechanism, the terminal device first accesses the primary cell of the target base station, and then the target base station reconfigures a new secondary cell for the terminal device. However, the current processing mode of the secondary cell is not flexible and efficient enough, which affects the service efficiency of the terminal device and the user experience is not good. SUMMARY

[0004] The communication method and related apparatus provided by the embodiments of the present application can be used to enable the terminal device to make a decision on synchronously activating a secondary cell based on the information configured by the network side and in combination with the measurement report, so as to improve the network flexibility and provide better communication services for the terminal.

[0005] In a first aspect, a communication method is provided. The method can be applied to a terminal device, or a module in the terminal device (wherein the module in the terminal device includes a communication module and a computing module), or a circuit or chip responsible for communication functions in the terminal device (such as a modem chip, also known as a baseband chip, or a system on chip (SoC) chip or a system in package (SIP) chip containing a modem core), or the terminal device can also be a logical module or software that can realize all or part of the functions of the communication device. The method includes: receiving first information of a first communication node, wherein the first information includes one or more of the following: a first parameter, a second parameter, and a first condition, the first parameter is used to indicate a carrier aggregation (CA) type, the second parameter is used to indicate a layer 1 / layer 2 triggered mobility (LTM) type, and the first condition includes a trigger condition of a first event, and the first event includes synchronously activating a secondary cell when the terminal device performs inter-station handover; In a case where the first parameter indicates that the CA type is collocated CA and the second parameter indicates that the LTM type is one-time LTM, the second information is sent to the first communication node in response to the first condition being met, where the second information includes a third parameter, and the third parameter is used to represent that the terminal device synchronously activates a target secondary cell when performing inter-site handover.

[0006] In some examples, inter-site handover refers to that a source cell and a target cell belong to different network devices. In an open RAN (O-RAN or ORAN) system, the first communication node includes a centralized unit (CU) and a distributed unit (DU), and the inter-site handover includes Inter-CU handover.

[0007] In the above method, the network side can configure the terminal device with parameters such as CA type, LTM type, and activation event threshold, and then the terminal device can autonomously determine whether the target secondary cell can be synchronously activated when performing inter-site handover based on the above parameters, and then the secondary cell can be synchronously activated when the network triggers LTM handover, so as to further reduce interruption delay, ensure service efficiency of the terminal device, and improve user experience.

[0008] In a possible implementation of the first aspect, the sending of the second information to the first communication node in response to the first condition being met includes: The second information is sent to the first communication node in response to the first measurement result meeting the first condition, where the first measurement result includes a layer 1 measurement result of a first serving cell of the terminal device, and the first serving cell includes a target primary cell and a to-be-activated secondary cell.

[0009] In the embodiments of the present application, the target primary cell refers to a control function entity that is about to provide master cell group (MCG) services for the terminal device.

[0010] For example, the network side can configure the terminal device with an LTM candidate cell, and the LTM candidate cell includes a special cell (SpCell) in a target cell group and one or more secondary cells. The first measurement result measured by the terminal device specifically includes layer 1 measurement results of the special cell (SpCell) and the one or more secondary cells.

[0011] In the above method, when the first measurement result (which can be specifically a measurement result of the to-be-activated secondary cell) satisfies a set L1 trigger condition (such as a reference signal received power (RSRP) threshold / reference signal received quality (RSRQ)), the terminal device determines that the target secondary cell can be activated synchronously when performing inter-site handover. It can be understood that the measurement action is performed by the terminal device, so that the judgment and feedback of the judgment result (i.e., the third parameter) by the terminal device can improve the processing efficiency and conform to the processing logic.

[0012] In a possible implementation of the first aspect, the second information further includes the first measurement result and beam synchronization information of the to-be-activated secondary cell, and the first communication node is configured to determine the target secondary cell from the to-be-activated secondary cell based on the first measurement result and the beam synchronization information of the to-be-activated secondary cell.

[0013] In the above method, when the terminal device determines that the secondary cell can be activated synchronously, the measurement result, the activation state, and the beam synchronization information are reported to the network side in a one-step manner, and the network side is configured to activate the secondary cell synchronously.

[0014] In a possible implementation of the first aspect, the first information further includes a first version number, and the first version number is used to indicate a version number corresponding to the first matter in a pre-configuration stage. The method further includes: receiving third information, the third information including a first identifier, a second identifier, and a second version number, wherein the first identifier is used to indicate the target primary cell, the second identifier is used to indicate the target secondary cell, and the second version number is used to indicate a version number corresponding to the first matter in a handover request stage; In the process of switching to the target primary cell, when the first version number and the second version number are the same, the target secondary cell is activated based on the beam synchronization information of the to-be-activated secondary cell.

[0015] In the method, a secondary cell activation configuration version number mechanism is introduced, the version number is determined by the network side based on the current network environment, and in the case of consistent version number, the secondary cell can be activated synchronously, thereby enhancing the rigor in the synchronous activation process. In addition, the third information can be carried in a medium access control control element (MAC CE), the MAC CE belongs to layer 2 signaling, the configuration and the version number are transmitted between CUs in the inter-CU switching process through layer 2 signaling, the terminal device is allowed to judge and execute the activation according to whether the version number matches, that is, the measurement result before the multiplexing switching is reused and the synchronous activation is executed through the version number verification, thereby the signaling efficiency of the synchronous process can be enhanced without the configuration change through inefficient radio resource control (RRC) signaling.

[0016] In a possible implementation of the first aspect, the method further includes: sending fourth information to the second communication node, wherein the fourth information includes first indication information and second indication information, the first indication information is used to indicate that the terminal device switches to the target primary cell based on the LTM mechanism, and the second indication information is used to indicate that the target secondary cell has been activated, and the target primary cell and the target secondary cell are located in the coverage of the wireless network of the second communication node.

[0017] In the method, the fourth information can be carried in the MAC CE, and the activation state is synchronously fed back to the target CU through the MAC CE, thereby the configuration fault problem in the inter-CU scenario can be solved, the switching interruption delay is reduced, the target secondary cell activation efficiency and configuration consistency are improved, and the primary cell switching and the secondary cell synchronous activation are realized.

[0018] In the second aspect, an embodiment of the present application provides a communication method, which can be applied to a network device (such as a first communication node), or a module in the network device (wherein the module in the network device includes a communication module and a calculation module), or a circuit or chip responsible for a communication function in the network device (such as a modem chip, also known as a baseband chip, or a system on chip (SoC) chip or a system in package (SIP) chip containing a modem core), or the network device can also be a logic module or software that can realize all or part of the communication device function. The method includes: sending first information to a terminal device, wherein the first information comprises one or more of the following: a first parameter, a second parameter, and a first condition, the first parameter is used to indicate a carrier aggregation (CA) type, the second parameter is used to indicate a layer 1 / layer 2 triggered mobility (LTM) type, and the first condition comprises a trigger condition of a first matter, the first matter comprises synchronously activating a secondary cell when the terminal device performs an inter-site handover; receiving second information of the terminal device, wherein the second information is sent by the terminal device when the first parameter indicates that the CA type is a co-sited CA, the second parameter indicates that the LTM type is a one-time LTM, and the first condition is met, and the second information comprises a third parameter, the third parameter is used to represent a target secondary cell that is synchronously activated by the terminal device when performing an inter-site handover.

[0019] In a possible implementation of the second aspect, the first condition is met when a first measurement result meets the first condition, the first measurement result comprises a layer 1 measurement result of a first serving cell of the terminal device, and the first serving cell comprises a target primary cell and an activated secondary cell.

[0020] In a possible implementation of the second aspect, the method further comprises: The second information further comprises the first measurement result and beam synchronization information of the activated secondary cell. The target secondary cell is determined from the activated secondary cell based on the first measurement result and the beam synchronization information of the activated secondary cell.

[0021] In a possible implementation of the second aspect, the method further comprises: sending third information, the third information comprises a first identifier, a second identifier, and a second version number, wherein the first identifier is used to indicate the target primary cell, the second identifier is used to indicate the target secondary cell, and the second version number is used to indicate a version number corresponding to the first matter in a handover request phase. The first information further comprises a first version number, the first version number is used to indicate a version number corresponding to the first matter in a pre-configuration phase, and in a process in which the terminal device is handed over to the target primary cell, the beam synchronization information of the activated secondary cell is used for the terminal device to activate the target secondary cell when the first version number and the second version number are the same.

[0022] In a possible implementation of the second aspect, the method further comprises: sending, to a second communication node, handover request information, wherein the handover request information comprises configuration information of the target secondary cell and beam synchronization information of the target secondary cell, the second communication node is configured to reserve resources for the target secondary cell based on the configuration information of the target secondary cell and the beam synchronization information of the target secondary cell, the target primary cell and the target secondary cell are located in a coverage of a wireless network of the second communication node; receiving handover request confirmation information of the second communication node, wherein the handover request confirmation information is used to indicate that resources have been reserved for the target secondary cell.

[0023] In the above method, the activation configuration of the target secondary cell can be synchronized in the handover request information by means of a logical interface (such as an Xn-application protocol (AP) interface), so as to effectively solve the configuration fault problem in the Inter-CU scenario, reduce the handover interruption delay, improve the SCell activation efficiency and configuration consistency, and realize the primary cell handover and the secondary cell synchronous activation.

[0024] In a third aspect, an embodiment of the present application provides a communication apparatus, which can be a network device, a component (for example, a processor, a chip, a circuit, or a chip system) in the network device, or a logic module or software capable of realizing all or part of the network device functions.

[0025] In a possible implementation, the communication apparatus can include a module or unit or means corresponding to each of the methods / operations / steps / actions described in the first aspect, which can be a hardware circuit, software, or a combination of hardware circuit and software.

[0026] In a possible implementation, the communication apparatus includes a processing unit and a transceiver unit, and the transceiver unit is configured to receive first information of a first communication node, wherein the first information comprises one or more of the following: a first parameter, a second parameter, and a first condition, the first parameter is used to indicate a carrier aggregation (CA) type, the second parameter is used to indicate a layer 1 / layer 2 triggered mobility (LTM) type, and the first condition comprises a trigger condition of a first event, and the first event comprises a synchronous activation of a secondary cell when the terminal device performs an inter-site handover. The processing unit is configured to send, by the transceiving unit, second information to the first communication node in response to the first condition being satisfied, when the first parameter indicates that the CA type is collocated CA and the second parameter indicates that the LTM type is one-time LTM, wherein the second information comprises a third parameter, and the third parameter is used to represent that the terminal device synchronously activates a target secondary cell when performing inter-station handover.

[0027] In a fourth aspect, an embodiment of the present application provides a communication apparatus, which can be a terminal device, a component (for example, a processor, a chip, a circuit, or a chip system) in the terminal device, or a logic module or software capable of realizing all or part of the functions of the terminal device.

[0028] In a possible implementation, the communication apparatus can include a module or unit or means (means) corresponding to each of the methods / operations / steps / actions described in the second aspect, which can be a hardware circuit, software, or a combination of hardware circuit and software.

[0029] In a possible implementation, the communication apparatus includes a processing unit and a transceiving unit, the processing unit is configured to generate first information, and the transceiving unit is configured to send the first information to a terminal device, wherein the first information comprises one or more of the following: a first parameter, a second parameter, and a first condition, the first parameter is used to indicate a carrier aggregation (CA) type, the second parameter is used to indicate a layer 1 / layer 2 triggered mobility (LTM) type, and the first condition comprises a trigger condition of a first event, and the first event comprises synchronously activating a secondary cell when the terminal device performs inter-station handover. The transceiving unit is further configured to receive second information of the terminal device, wherein the second information is sent by the terminal device when the first parameter indicates that the CA type is collocated CA, the second parameter indicates that the LTM type is one-time LTM, and the first condition is satisfied, and the second information comprises a third parameter, and the third parameter is used to represent that the terminal device synchronously activates a target secondary cell when performing inter-station handover.

[0030] In a fifth aspect, an embodiment of the present application provides a communication apparatus, which includes one or more processors. Optionally, the communication apparatus further includes a memory, which is configured to store part or all of necessary computer programs or instructions for realizing the functions involved in the first aspect. The one or more processors can execute the computer programs or instructions, and when the computer programs or instructions are executed, the one or more processors cause the communication apparatus to implement the method in any possible design or implementation manner in the first aspect.

[0031] In a possible design, the communication apparatus further includes an interface circuit, and the processor is configured to communicate with other apparatuses or components via the interface circuit.

[0032] In a possible design, the communication apparatus further includes the memory.

[0033] The communication apparatus can be a network device, a communication module in a network device, a chip responsible for communication functions in a network device, such as a modem chip, also known as a baseband chip, or a system on chip (SoC) chip or a system in package (SIP) chip containing a modem core.

[0034] In a sixth aspect, this application provides a communication apparatus, which includes one or more processors. Optionally, the communication apparatus further includes a memory, which is configured to store part or all of the necessary computer programs or instructions for implementing the functions in the second aspect. The one or more processors can execute the computer programs or instructions, and when the computer programs or instructions are executed, the communication apparatus implements the method in any possible design or implementation manner in the second aspect.

[0035] In a possible design, the communication apparatus further includes an interface circuit, and the processor is configured to communicate with other apparatuses or components via the interface circuit.

[0036] In a possible design, the communication apparatus further includes the memory.

[0037] The communication apparatus can be a terminal device, a communication module in a terminal device, a chip responsible for communication functions in a terminal device, such as a modem chip, or a SoC chip or a SIP chip containing a modem module.

[0038] In a seventh aspect, this application provides a chip apparatus, which includes at least one processor configured to invoke computer programs or instructions to implement the method in any aspect or possible implementation manner of any aspect.

[0039] In a possible implementation manner, an input of the chip apparatus corresponds to the receiving operation in any aspect or possible implementation manner of any aspect, and an output of the chip apparatus corresponds to the sending operation in any aspect or possible implementation manner of any aspect.

[0040] Optionally, the processor is coupled with the memory via an interface.

[0041] Optionally, the chip device further comprises a memory, and the memory stores the computer program or instructions.

[0042] In an eighth aspect, an embodiment of the present application provides a computer readable storage medium, which stores computer programs or instructions, and when the computer programs or instructions are run on a processor, a method of any of the above aspects is implemented.

[0043] In a ninth aspect, an embodiment of the present application provides a computer program product, which comprises computer programs or instructions, and when the computer programs or instructions are run on a processor, a method of any of the above aspects is implemented.

[0044] In a tenth aspect, an embodiment of the present application provides a communication system, which comprises the apparatus of the fifth aspect and the apparatus of the sixth aspect. The communication system can further comprise a second communication node.

[0045] It should be understood that the description of technical features, technical solutions, advantages or the like in the present application does not imply that all features and advantages can be realized in any single embodiment. On the contrary, it can be understood that the description of a feature or advantage means that the specific technical feature, technical solution or advantage is included in at least one embodiment. Therefore, the description of technical features, technical solutions or advantages in the specification does not necessarily refer to the same embodiment. Furthermore, the technical features, technical solutions and advantages described in the embodiments can be combined in any appropriate manner. Those skilled in the art will understand that the embodiments can be implemented without one or more specific technical features, technical solutions or advantages of a specific embodiment. In other embodiments, additional technical features and advantages can be identified in specific embodiments that do not embody all embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0046] The following describes the drawings used in the embodiments of the present application.

[0047] Figure 1 An architecture schematic diagram of a communication system provided by the present application is provided. Figure 2 An ORAN system provided by an embodiment of the present application is shown. Figure 3 An interaction flow schematic diagram of a communication method provided by an embodiment of the present application is shown. Figure 4 A flow schematic diagram of a communication method provided by an embodiment of the present application is shown. Figure 5 A signaling interaction schematic diagram in a split architecture of an ORAN system provided by an embodiment of the present application is shown. Figure 6is a structural schematic diagram of a communication device provided by an embodiment of the present application. Figure 7 is a structural schematic diagram of another communication device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0048] The terms "system" and "network" can be used interchangeably in the present application. Unless otherwise specified, " / " means that the objects before and after the " / " are in an "or" relationship, for example, A / B can mean A or B; "and / or" in the present application is only a description of the relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone, where A and B can be singular or plural. In addition, in the description of the present application, unless otherwise specified, "multiple" means two or more than two. "At least one of the following" or the like means any combination of the items, including any combination of single item or multiple items. For example, at least one of a, b or c can mean a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, and c can be one or more. In addition, in order to clearly describe the technical solutions of the present application, in the embodiments of the present application, the same items or similar items with basically the same function are distinguished by "first", "second", etc. The skilled in the art can understand that "first", "second", etc. do not limit the quantity and execution order, and "first", "second", etc. do not necessarily mean different.

[0049] In the present application, the reference "in an implementation" or "exemplarily" or "in an implementation" means that in one or more embodiments of the present application, the specific features, structures or characteristics described in connection with the embodiment are included. Therefore, the statements "in an embodiment", "in some embodiments", "in other some embodiments", "in some other embodiments" and the like in the specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized. The terms "include", "contain", "have" and their variants mean "include but are not limited to", unless otherwise specifically emphasized.

[0050] It can be understood that in the present application, "indication" can include direct indication, indirect indication, display indication, implicit indication. When describing that certain indication information is used to indicate A, it can be understood that the indication information carries A, directly indicates A, or indirectly indicates A.

[0051] In the present application, the information indicated by the indication information is referred to as to-be-indicated information. In the specific implementation process, there are many ways to indicate the to-be-indicated information, for example, but not limited to, the to-be-indicated information can be directly indicated, such as the to-be-indicated information itself or the index of the to-be-indicated information, or the to-be-indicated information can be indirectly indicated by indicating other information, wherein the other information and the to-be-indicated information have an association relationship. It can also only indicate part of the to-be-indicated information, and the other part of the to-be-indicated information is known or agreed in advance. For example, the indication of a specific information can also be achieved by means of the arrangement order of each information agreed in advance (for example, the protocol stipulates), thereby reducing the indication overhead to a certain extent.

[0052] The to-be-indicated information can be sent as a whole, or can be sent separately into multiple sub-information, and the sending period and / or sending occasion of the sub-information can be the same or different. The specific sending method is not limited in the present application. The sending period and / or sending occasion of the sub-information can be predefined, for example, predefined according to the protocol, or configured by the transmitting end device by sending configuration information to the receiving end device.

[0053] It can be understood that the "sending" and "receiving" in the present application represent the direction of signal transmission. For example, "sending information to XX" can be understood as that the destination of the information is XX, which can include direct sending through the air interface, or indirect sending through the air interface by other units or modules. "Receiving information from YY" can be understood as that the source of the information is YY, which can include direct receiving from YY through the air interface, or indirect receiving from YY through the air interface from other units or modules. "Sending" can also be understood as "output" of the chip interface, and "receiving" can also be understood as "input" of the chip interface.

[0054] In other words, the sending and receiving can be between devices, for example, between network devices and terminal devices, or within a device, for example, between components, modules, chips, software modules or hardware modules in the device through a bus, wire or interface.

[0055] It can be understood that the information between the source and the destination of the information sending can be processed as necessary, such as encoding, modulation, etc., but the destination can understand the effective information from the source. Similar expressions in the present application can be understood similarly, and will not be repeated here.

[0056] The technical solutions provided in this application can be applied to various communication systems, such as Long Term Evolution (LTE) systems, LTE frequency division duplex (FDD) systems, LTE time division duplex (TDD) systems, 5th generation (5G) systems, or new radio (NR) systems. In addition, they can also be applied to future communication systems, such as 6th generation (6G) communication systems.

[0057] Furthermore, the embodiments of this application can be applied to scenarios of cell handover, such as cell handover scenarios of layer 1 / layer 2 triggered mobility (LTM) mechanism (hereinafter referred to as LTM handover), etc. This application does not limit the specific handover scenario.

[0058] To facilitate understanding of the embodiments of this application, the communication system architecture provided in the embodiments of this application will first be described by way of example. Please refer to... Figure 1 , Figure 1 This application provides a schematic diagram of the architecture of a communication system. The communication system 100 includes a network device 101 and a terminal device 102. Exemplarily, the network device 101 can provide communication coverage (cell) and can communicate with the terminal device 102 located within the communication coverage (cell). The apparatus provided in this application embodiment can be applied to the network device 101 or to the terminal device 102. It is understood that... Figure 1 This application only illustrates one possible communication system architecture that can be applied to an embodiment of the present application. In other possible scenarios, the communication system architecture may also include other devices.

[0059] The network device 101 includes a radio access network (RAN) and can also include a core network device. For example, the network device can be a node in a radio access network, which can also be referred to as a base station, and can also be referred to as a RAN node (or device). Currently, some examples of the network device 101 are: a transmission reception point (TRP), an evolved Node B (eNB), a radio network controller (RNC), a Node B (NB), a base station controller (BSC), a base transceiver station (BTS), a home base station (for example, a home evolved Node B, or home Node B, HNB), a base band unit (BBU), a next generation Node B (gNB), a new radio Node B (NR-NB), or a wireless fidelity (Wifi) access point (AP), a satellite device, or a network device in a 5G communication system, or a network device in a future possible communication system. The network device 101 can also be other devices with network device functions, for example, the network device 101 can also be a device that plays a network device function in device to device (D2D) communication, vehicle-to-vehicle communication, machine communication, and the like. The network device 101 can also be a network device in a future possible communication system.

[0060] In some deployments, the network device can also be an access network device in an open RAN (O-RAN or ORAN). Exemplarily, taking the access network device as a gNB, the gNB can include a centralized unit (CU) and a distributed unit (DU). The gNB can also include a radio unit (RU). The CU implements part of the functions of the gNB, and the DU implements part of the functions of the gNB, for example, the CU implements the functions of the radio resource control (RRC) layer and the packet data convergence protocol (PDCP) layer, and the DU implements the functions of the radio link control (RLC) layer, the media access control (MAC) layer, and the physical (PHY) layer. Since the information of the RRC layer will eventually become the information of the PHY layer, or be converted from the information of the PHY layer, under this architecture, high-layer signaling such as RRC layer signaling or PDCP layer signaling can also be considered as being sent by the DU, or by the DU+RU. It can be understood that the network device can be a CU node, or a DU node, or a device including a CU node and a DU node. In addition, the CU can be divided into a network device in an access network RAN, or the CU can be divided into a network device in a core network CN, which is not limited here.

[0061] Exemplarily, the network device serves a cell, and a terminal device communicates with the cell through a transmission resource (for example, a frequency domain resource, or a spectrum resource) allocated by the network device. The cell can belong to a macro base station (for example, a macro eNB or a macro gNB, etc.), or a base station corresponding to a small cell. The small cell here can include a metro cell, a micro cell, a pico cell, a femto cell, etc., which have the characteristics of small coverage and low transmit power, and are suitable for providing high-speed data transmission services.

[0062] The terminal device 102, which can also be referred to as a user equipment (UE), a mobile station (MS), a mobile terminal (MT), etc., is a device that provides voice or data connectivity to a user, and can also be an Internet of Things (IoT) device. For example, the terminal device includes a handheld device having wireless connection capability, a vehicle-mounted device, etc. Currently, the terminal device can be a mobile phone, a tablet computer, a notebook computer, a palm computer, a mobile Internet device (MID), a wearable device (e.g., a smart watch, a smart bracelet, a pedometer, etc.), a vehicle-mounted device (e.g., a car, a bicycle, an electric vehicle, an airplane, a ship, a train, a high-speed rail, etc.), a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a smart home device (e.g., a refrigerator, a television, an air conditioner, an electricity meter, etc.), a smart robot, a workshop device, a wireless terminal in unmanned driving, a wireless terminal in remote surgery, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, or a wireless terminal in a smart home, a flight device (e.g., a smart robot, a hot air balloon, a drone, an airplane), etc. The terminal device can also be other devices with terminal functions, for example, the terminal device can also be a device that plays a terminal function in D2D communication. In this application, the terminal device with wireless transceiver function and the chip that can be arranged in the terminal device are collectively referred to as the terminal device. The terminal device can also be a terminal device in an Internet of Things (IoT) system. IoT is an important part of future information technology development, and its main technical feature is to connect objects through communication technology and network, so as to realize the intelligent network of man-machine interconnection and object-object interconnection.

[0063] Exemplarily, the network device provides services for a cell, such as transmission resources (for example, frequency domain resources or spectrum resources), and the terminal device 102 can communicate with the network device 101 through the cell managed by the network device 101. Alternatively, the movement of the terminal device 102, the change of the service, the change of the network coverage, or other reasons can cause the current cell to be unable to continue to provide services for the terminal device 102 or the quality of services provided by the current cell for the terminal device 102 to be poor. In order not to interrupt the service, the terminal device 102 is switched to other cells that are more suitable, and the other cells provide services for the terminal device 102. Alternatively, the above-mentioned cell can belong to a macro base station (for example, a macro eNB or a macro gNB, etc.), or a base station corresponding to a small cell (small cell), and the small cell here can include a metro cell, a micro cell, a pico cell, a femto cell, etc.

[0064] Please refer to Figure 2 , Figure 2 is a schematic diagram of an ORAN system provided by an embodiment of the present application. As shown in Figure 2 , the ORAN system includes a core network device, an access network device, and a terminal. Optionally, the ORAN system can also include other components in addition to the components shown in Figure 2 , and the specific embodiments of the present application are not limited.

[0065] In some examples, the access network device can communicate with the core network (CN) through a backhaul link. The access network device can communicate with the terminal through an air interface. Specifically, the BBU in the access network device communicates with the core network through the backhaul link. The RU in the access network device communicates with at least one terminal through the air interface. The BBU communicates with at least one RU through a front-haul link, and the BBU and the RU can be co-located or not co-located.

[0066] Exemplarily, the BBU includes at least one CU and at least one DU, and the CU and the DU can communicate through at least one middle-haul link.

[0067] First, the related names or terms involved in the embodiments of the present application are described.

[0068] 1. Measurement, measurement refers to real-time monitoring of the communication quality of the serving cell and / or the neighbor cell (i.e., non-serving cell) of the UE, so that when necessary, the UE can change the serving cell through handover or cell selection / reselection, etc., and maintain the communication link between the network and the UE. In NR, measurement can be divided into cell-level measurement and beam-level measurement: Beam level measurement: UE measures and reports information related to one or more beams (synchronization signal / physical broadcast channel block (SSB) or channel state information-reference signal (CSI-RS)) of a cell. Specifically, the reported information includes the index of the beam, and (based on network configuration) optionally the measurement result of the beam.

[0069] Cell level measurement: UE performs averaging processing on the measurement results of one or more beams (SSB or CSI-RS) of a cell to obtain and report the measurement result of the cell (i.e., the quality of the cell is essentially measured by measuring the quality of several beams of the cell). For example, UE measures the quality of each of beams 0~beam7, and averages the quality of these beams to obtain a result as the cell level quality of the cell.

[0070] 2. Cell, in a communication system, a cell is described from the perspective of resource management or mobility management or service unit by a higher layer. The coverage of each network device can be divided into one or more cells, and each cell can correspond to one or more frequency points, or in other words, each cell can be regarded as an area formed by the coverage of one or more frequency points.

[0071] In some examples, one or more cells currently providing wireless connection services for a UE can be referred to as serving cells, and in the case of carrier aggregation (CA), the serving cells of a UE can be a set including a primary cell (PCell) and at least one currently activated secondary cell (SCell). Among them, the primary cell is used to be responsible for all control plane signaling, security and basic data transmission, and the secondary cell is used to enhance the user plane data transmission rate.

[0072] It should be noted that the cell can be an area in the coverage range of the wireless network of the network device, and different cells can correspond to the same or different network devices. For example, the network device to which the cell 1 belongs and the network device to which the cell 2 belongs can be different network devices (such as base stations), that is, the cell 1 and the cell 2 can be managed by different base stations. Or, for another example, the network device managing the cell 1 and the network device managing the cell 2 can also be different radio frequency processing units of the same base station, for example, radio remote units (RRUs), that is, the cell 1 and the cell 2 can be managed by the same base station, have the same baseband processing unit and intermediate frequency processing unit, but have different radio frequency processing units. Or, for another example, the network device to which the cell 1 belongs and the network device to which the cell 2 belongs can be the same network device (such as a base station). That is, the cell 1 and the cell 2 can be managed by the same base station, which can be referred to as co-sited cell 1 and cell 2. The present application does not particularly limit this.

[0073] In some possible deployments, the base station can include a CU and a DU. In such a deployment, the cell 1 and the cell 2 can be managed by the same CU and the same DU, that is, co-CU and co-DU; the cell 1 and the cell 2 can be managed by the same CU and different DUs, that is, co-CU but not co-DU; the cell 1 and the cell 2 can also be managed by different CUs and different DUs, that is, not co-CU and not co-DU.

[0074] 3. Cell switching. In a communication system, due to the movement of the location of the terminal device, in order to maintain uninterrupted communication of the terminal device, the terminal device can perform cell switching. In order to facilitate differentiation and understanding, the cell division described in the embodiments of the present application is divided into the following three categories: (1) Source cell: the cell to which the terminal device belongs before performing cell switching.

[0075] (2) Candidate cell: at least one cell to which the terminal device can switch when performing cell switching. Exemplarily, the at least one candidate cell of the terminal device includes a target cell.

[0076] (3) Target cell: the cell to which the terminal device needs to switch finally.

[0077] (4) Serving cell: the terminal device needs to establish a wireless connection with the cell managed by the network device in order to communicate with the network device. The cell with which the terminal device establishes a wireless connection can be referred to as the serving cell of the terminal device. In the embodiments of the present application, before the terminal device performs cell switching, the serving cell is the source cell. After the terminal device performs cell switching, the serving cell is the target cell.

[0078] The cell handover includes an intra-station handover and an inter-station handover. For example, the intra-station handover refers to a case where the source cell and the target cell belong to the same network device (for example, a base station), and the source cell and the target cell can be the same cell or different cells. In some examples, the intra-station handover includes intra-CU handover, that is, handover from a cell under one DU to a cell under another DU, and the two DUs belong to the same CU, that is, the source cell and the target cell belong to different DUs but belong to the same CU. For another example, the inter-station handover refers to a case where the source cell and the target cell belong to different network devices (for example, base stations). In some examples, the inter-station handover can also be referred to as inter-CU handover, that is, the control plane anchor point connected by the terminal device is switched from one CU to another CU, that is, the source cell and the target cell belong to different CUs.

[0079] It should be understood that the cell is the coverage area of the network device, the source cell corresponds to the source network device (for example, a source base station), and the candidate cell corresponds to the candidate network device (for example, a candidate base station).

[0080] 4. LTM handover, that is, mobility conditional handover based on L1 / L2 signaling or mobility conditional handover based on beam measurement results. That is, the terminal device performs cell handover through L1 / L2 signaling, which can reduce the handover delay.

[0081] In the process of performing cell handover based on L1 / L2 signaling, the terminal device is allowed to acquire the uplink timing advance (TA) of the candidate cell to be switched through random access before performing cell handover. For example, L1 can refer to the physical layer, and L2 can refer to any one or more of the media access control (MAC) layer, the packet data convergence protocol (PDCP) layer, and the service data adaptation protocol (SDAP) layer. It can be understood that L1 / L2 handover can also be understood as L1 and / or L2 handover. In one implementation, when it is an “and” relationship, the operations related to the handover process are mainly completed by L1 and L2 together. In another implementation, when it is an “or” relationship, the operations related to the handover process are mainly completed by L1 or L2. Since L1 and L2 are located in a lower protocol stack, L1 / L2 handover can also be referred to as low-layer handover, bottom-layer handover, or lower-layer handover, and the application does not limit the name of the specific handover technology.

[0082] For example, the trigger condition of LTM handover includes one or more of the following: (1) Based on signal quality. The signal quality involved in the embodiments of the present application is the result of signal quality or signal energy measurement based on a reference signal. For example, one or more of the following: reference signal received power (RSRP), reference signal received quality (RSRQ), received signal strength indicator (RSSI), signal to interference plus noise ratio (SINR). The meanings of the above terms can be referred to the provisions of the protocols or standards of communication technology. Among them, the trigger condition information of LTM switching can include the trigger event type, trigger quantity and corresponding threshold value of LTM switching. The trigger event type of LTM switching can include event A3, event A4, event A5, event B1, event B2 or other trigger event types, etc. For specific details, please refer to the provisions of the protocols or standards of communication technology. The trigger quantity is the signal quality of the terminal device. For example, assuming that the terminal device is configured with the trigger event type A3 of conditional LTM switching, and the trigger quantity is the signal quality, in the case that the signal quality of the candidate cell of the terminal device is higher than the signal quality of the current serving cell by a threshold value, it can be considered that the terminal device meets the trigger condition of conditional LTM switching, and the terminal device can perform cell switching.

[0083] For example, the reference signal received power (RSRP) is defined as the linear average of the power of the resource elements (REs) carrying the reference signal (SSB or CSI-RS) within the measurement bandwidth. According to the reference signal being SSB or CSI-RS, the corresponding RSRP can be called SS-RSRP or CSI-RSRP. The unit of RSRP is decibel milliwatt (dBm).

[0084] The reference signal received quality (RSRQ) is defined as the ratio of , where the carrier received signal strength indicator (RSSI) is the linear average of the total received power observed by the UE on N resource blocks (RBs), including co-channel serving cells and non-serving cells, adjacent channel interference, thermal noise, etc. N is the number of resource blocks (RBs) in the RSSI measurement of the carrier, and RSRP can be SS-RSRP or CSI-RSRP. The unit of RSRQ is decibel (dB).

[0085] Signal to interference noise ratio (SINR), defined as the ratio between the linear average of the power of the REs carrying the reference signal (SSB or CSI-RS) and the linear average of the power of the noise and interference on the REs within the measurement bandwidth under consideration, i.e. .

[0086] (2) Based on location information. The trigger condition information of the LTM handover can include location information. In a possible implementation, the location information can be the location information of the terminal device on the ground, such as latitude and longitude values, which can be used to determine a certain area or a certain fixed point. When the geographical position of the terminal device meets the latitude and longitude requirements (for example, the terminal device moves to the area indicated by the latitude and longitude values or the fixed point position), the terminal device can perform handover. In another possible implementation, the location information can include the distance between the terminal device and the location reference point 1 corresponding to the source cell and the distance between the terminal device and the location reference point 2 corresponding to the target cell. For example, the trigger condition information of the LTM handover can include a first distance threshold value and a second distance threshold value. When the distance between the terminal device and the location reference point 1 corresponding to the source cell is greater than or equal to the first distance threshold value, and the distance between the terminal device and the location reference point 2 corresponding to the target cell is less than or equal to the second distance threshold value, the UE can perform handover.

[0087] (3) Based on time information or timer. The trigger condition information of the LTM handover can include time information. In a possible implementation, the trigger condition information of the LTM handover can be an absolute time, for example, a time point such as (coordinated universal time (UTC) 12:00, a time period (for example, UTC 12:00-UTC 13:00, or a start time and a time period duration, etc.), when the absolute time arrives, the terminal device can perform handover. In another possible implementation, the trigger condition information of the LTM handover can be a relative time, for example, the effective duration of a timer. For example, after the terminal device receives the configuration information of the LTM handover, the timer is started. When the effective duration of the timer arrives, the terminal device can perform handover.

[0088] In a possible implementation, at least one of the above-mentioned three trigger condition information of the LTM handover can be configured as the execution condition information of the LTM handover. For example, the execution event type of the LTM handover and the corresponding threshold value, the absolute time value can be configured as the execution condition information of the LTM handover. When the absolute time arrives, and the signal quality of the corresponding candidate cell meets the condition, the terminal device can determine the candidate cell as the target cell and perform handover.

[0089] In yet another possible implementation, one candidate cell can correspond to one or more pieces of trigger condition information of LTM switching. The pieces of trigger condition information of LTM switching corresponding to different candidate cells can be the same or different.

[0090] It should be understood that although the LTM mechanism introduced in Release 18 (Rel-18) of the 3rd generation partnership project (3GPP) can reduce the probability of switching interruption and delay, it only supports intra-CU switching and relies on SSB reference signals, which has limitations. Subsequent Rel-19 adds inter-CU switching based on LTM, event-triggered L2 reporting, and CSI-RS reference signal support through optimization enhancement of the Mobility Enhancement Ph4, but it requires a large amount of signaling coordination on the network side to generate the RRC configuration of the UE, resulting in lower configuration change efficiency. It should be understood that in the current inter-CU switching based on LTM, the UE first switches to the target primary cell, and then adds and activates the target secondary cell through a conventional process (i.e., RRC configuration and MAC CE activation), that is, the secondary cell activation cannot be controlled in the LTM switching command, and carrier aggregation can only take effect according to the pre-stored RRC configuration. Rel-20 is studying to allow the network to dynamically activate the secondary cell through the LTM command when switching the primary cell, to improve flexibility.

[0091] Based on this, the embodiments of the present application provide a communication method and related apparatus, in which, in the method, the terminal device can make a decision on synchronous activation of a secondary cell according to information configured by the network side in combination with a measurement report, and in a subsequent inter-site handover process, the measurement result can be used to synchronously activate the secondary cell, to improve network flexibility and provide better communication services for the terminal.

[0092] The following will be described in combination with Figure 3The communication method provided by the embodiments of the present application is described in detail. The method can be implemented by a terminal device and a network device. Exemplarily, the network device includes a first communication node and a second communication node. It should be understood that the steps performed by the terminal device in the method can also be performed by components (such as chips, modules or circuits, etc.) in the terminal device, and / or the steps performed by the network device in the method can also be performed by components (such as chips, modules or circuits, etc.) in the network device. Exemplarily, in the case where the source serving cell of the terminal device and the target serving cell (for example, the target primary cell and the target secondary cell) to which the terminal device is to be handed over belong to different network devices, the first communication node and the second communication node are different network devices. In the following description, the first communication node manages the source serving cell of the terminal device, and the second communication node manages the target serving cell of the terminal device is taken as an example for description.

[0093] Please refer to Figure 3 , Figure 3 is a communication method provided by an embodiment of the present application, which can be implemented based on the architecture shown in Figure 1 or other architectures. The method includes but is not limited to the steps shown in steps S301 to S306, which are described below.

[0094] Step S301: The first communication node sends first information to the terminal device, and the first information includes one or more of the following: a first parameter, a second parameter and a first condition. Correspondingly, the terminal device receives the first information.

[0095] Optionally, before the first communication node sends the first information to the terminal device, the first communication node generates the first information.

[0096] The first information includes one or more of the following: The first parameter is used to indicate the carrier aggregation (CA) type, and exemplarily, the CA type includes co-sited CA and non-co-sited CA. The core difference between the co-sited CA and the non-co-sited CA lies in whether the cells corresponding to the aggregated multiple carriers (CCs) are deployed at the same physical location by the same set of radio frequency devices (such as CU and DU). That is, in the co-sited CA, the cells corresponding to all component carriers are provided by the same station and the same set of radio frequency devices; in the non-co-sited CA, the cells corresponding to all component carriers are provided by different stations or independent radio frequency devices at the same station but in different physical locations. In some examples, the first parameter can be represented as CATypeFlag, which is a 1-bit flag. When the value of the first parameter is 1, the first parameter indicates that the CA type is co-sited CA, and when the value of the first parameter is 0, the first parameter indicates that the CA type is non-co-sited CA.

[0097] A second parameter is used to indicate an LTM type. Exemplarily, the LTM type includes a one-time LTM and a continuous LTM (c-LTM). The one-time LTM refers to that the terminal device only performs cell switching once in the LTM mechanism, and the continuous LTM refers to that the terminal device can perform multiple cell switching in the LTM mechanism, for example, the terminal device switches from a cell 1 to a cell 2, and then switches from the cell 2 to a cell 3. In some examples, the second parameter can be represented as LTMTypeFlag, which is a 1-bit flag. When the second parameter takes a value of 1, the second parameter indicates that the LTM type is the one-time LTM, and when the second parameter takes a value of 0, the second parameter indicates that the LTM type is the continuous LTM.

[0098] A first condition includes a trigger condition of a first event, and the first event refers to (includes) simultaneous activation of a secondary cell when the terminal device performs inter-site handover (based on the LTM mechanism). That is, the first condition includes a trigger condition of simultaneous activation of the secondary cell when the terminal device performs inter-site handover. In other words, in the case where the first condition is met, the terminal device can simultaneously activate the secondary cell when performing inter-site handover. In some examples, the first condition can be represented as SCellActivation EventConfiguration (SCellActEventConfig), which specifically includes an L1 event trigger measurement threshold (such as an RSRP threshold, an RSRP threshold, and the like).

[0099] In an implementation, the first information further includes a first version number, which can be referred to as a SCellActConfigVersion. The first version number is used to indicate a version number corresponding to the first event in the pre-configuration stage. That is, the version number corresponding to the event of simultaneous activation of the secondary cell when the terminal device performs inter-site handover in the pre-configuration stage. The version number can be determined by the first communication node in combination with the network environment of the pre-configuration stage, and is used to ensure consistency of the secondary cell activation configuration of the target serving cell and the terminal device in the inter-site handover (such as inter-CU) scenario. That is, in the case where the version numbers are consistent, the secondary cell configuration can be activated. In other words, the version number is determined based on the current network environment, and therefore the consistent version numbers indicate consistent network environments.

[0100] In another implementation, the first information can further include at least one of the following: a candidate cell list including a candidate cell ID, and a secondary cell list including at least one secondary cell ID (SCell ID) that can be used by the terminal device in a carrier aggregation scenario.

[0101] Further, in the LTM switching, the first information further comprises configuration information of the candidate cell and a trigger condition of the LTM switching. Exemplarily, the candidate cell can be one or more. In the LTM switching, these candidate cells are also referred to as LTM candidate cells. Optionally, the configuration information of the candidate cell can comprise one or more of the following: a cell radio network temporary identifier allocated to the terminal device by the candidate cell, a random access channel for accessing the candidate cell, a physical layer configuration parameter corresponding to the candidate cell, a medium access control layer configuration parameter, a radio link control layer configuration parameter, a packet data convergence protocol layer configuration parameter, a service data adaptation protocol layer configuration parameter, a radio resource control layer configuration parameter, and the like. Optionally, the first information can further carry an identifier corresponding to the configuration information of the candidate cell.

[0102] As an example, the first information can be carried in RRC signaling (such as RRCReconfiguration signaling). That is, the first communication node can pre-configure the first information for the terminal device through RRC signaling.

[0103] In a possible implementation, in a split architecture of an ORAN system, the first communication node comprises a source CU and a source DU, the source CU is responsible for high-layer signaling processing, and the source DU is responsible for bottom-layer protocol processing and can directly interact with the terminal for air interface data, and executes the configuration instructions issued by the source CU. When pre-configuring the terminal device, the source CU sends RRCReconfiguration signaling to the source DU, which can include the first parameter for indicating the CA type, the second parameter for indicating the LTM type, and the first condition including the trigger condition of the first information in addition to the candidate cell list and the secondary cell list to be added / modified. After receiving the configuration, the source DU can add a secondary cell to the terminal device and / or modify the parameters of the configured secondary cell to determine the secondary cell list, and then send the above-mentioned first information to the terminal device through RRCReconfiguration signaling. The terminal device stores the configuration parameters corresponding to the first information, and sends RRCReconfigurationComplete to the source DU to confirm the completion of the pre-configuration.

[0104] Step S302: in the case that the first parameter indicates that the CA type is co-sited CA and the second parameter indicates that the LTM type is one-time LTM, the second information is sent to the first communication node in response to the satisfaction of the first condition. Correspondingly, the first communication node receives the first information.

[0105] Optionally, before the terminal device sends the second information to the first communication node, the terminal device generates the second information.

[0106] The second information includes a third parameter, and the third parameter is used to represent that the terminal device can synchronously activate a target secondary cell when performing inter-station switching.

[0107] It should be understood that, in the case of the CA type being co-sited CA, the cells corresponding to the carrier of the co-sited CA are usually included in the same master cell group (MCG), and the MCG refers to a cell group to which the terminal device is connected for the first time by initiating random access, and the cell group at least includes one master cell, and a secondary cell can be added by carrier aggregation. The cells in the same cell group share part of the basic configuration, such as the same set of transmission configuration indicator (TCI) states, TA-related parameters, and the like. The network device (such as the first communication node) can pre-download the LTM candidate configuration (including the above basic configuration) to the terminal by RRC signaling. In this way, in the case of cell switching in the same cell group based on the LTM mechanism, the source cell and the candidate cell belong to the same cell group and can share part of the basic configuration, so that the terminal device has the condition of synchronously activating the secondary cell.

[0108] In a possible implementation, the terminal device receives and executes the configuration of the first information, and then performs measurement on the first service cell (including at least one target master cell and at least one to-be-activated secondary cell) to determine a first measurement result, and the first measurement result includes L1-level measurement of the first service cell of the terminal device. Further, the first measurement result can also include L3-level measurement of the first service cell of the terminal device. Illustratively, the MCG is configured to the user equipment by the network side, and the MCG at least includes one special cell (SpCell) and one or more secondary cells (SCell), and the SpCell refers to the PCell. In the LTM mechanism, the first communication node can include the SpCell in the target cell group in the LTM candidate cell list, and the first communication node downloads the LTM candidate cell configuration to the terminal device, and the terminal device receives and stores the configuration and starts measurement when the trigger condition is met. Illustratively, the target SpCell measured by the terminal device refers to the main service cell of the terminal device after switching. It should be understood that the terminal device can also perform measurement on the surrounding / adjacent cells to determine the signal measurement result of the surrounding / adjacent cells when performing measurement.

[0109] Further, the terminal device determines whether the secondary cell can be synchronously activated in performing the inter-site handover according to the parameters in the preconfigured first information. Specifically, in the case that the CA type indicated by the first parameter configured by the first communication node for the terminal device is co-sited CA and the LTM type indicated by the second parameter is one-time LTM, it is indicated that the terminal device has the condition to implement the synchronous activation of the secondary cell. Then, in the case that the first measurement result satisfies the first condition, it is indicated that the signal quality measurement result of the first secondary cell reaches the trigger threshold (including RSRP threshold, RSRP threshold) and the logical condition preconfigured by the network, without the complex processing of L2 / L3 layers, the terminal device can determine that the secondary cell can be synchronously activated in performing the inter-site handover, and further, the terminal device sends the second information to the first communication node in response to the first measurement result, and the second information carries the third parameter for representing that the terminal device can synchronously activate the target secondary cell in performing the inter-site handover.

[0110] Exemplarily, the third parameter can be an activation flag, which is a 1-bit flag. When the third parameter takes the value of 1, it represents that the terminal device can synchronously activate the target secondary cell in performing the inter-site handover. When the third parameter takes the value of 0, it represents that the terminal device cannot synchronously activate the target secondary cell in performing the inter-site handover.

[0111] In one implementation, in the case that the CA type indicated by the first parameter configured by the first communication node for the terminal device is co-sited CA and the LTM type indicated by the second parameter is one-time LTM, in the case that the measured RSRP / RSRP of the first secondary cell is greater than or equal to the trigger threshold, the third parameter is set to 1, and the second information carrying the third parameter with the value of 1 is sent to the first communication node. In this case, the terminal device determines that the secondary cell can be synchronously activated.

[0112] In another implementation, in the case that the CA type indicated by the first parameter configured by the first communication node for the terminal device is co-sited CA and the LTM type indicated by the second parameter is one-time LTM, in the case that the measured RSRP / RSRP of the first secondary cell is less than the trigger threshold, the third parameter is set to 0, and the second information carrying the third parameter with the value of 0 is sent to the first communication node. In this case, the terminal device determines that the secondary cell cannot be synchronously activated.

[0113] In another implementation, in the case that the CA type indicated by the first parameter configured by the first communication node for the terminal device is non-co-sited CA and / or the LTM type indicated by the second parameter is continuous LTM, the third parameter is set to 0. That is, in this case, the judgment of the first condition can not be performed, that is, regardless of whether the measured RSRP / RSRP of the first secondary cell is greater than or equal to the trigger threshold, the terminal device determines that the secondary cell cannot be synchronously activated.

[0114] In yet another possible implementation, the second information can be a measurement report of the terminal device, which includes signal measurement results of surrounding / adjacent cells. Further, in the case that the second information includes the third parameter, the second information sent by the terminal device to the first communication node can further include one or more of the following: first measurement results (including L1 measurement results of the target primary cell and the to-be-activated secondary cell, and optionally, L3 measurement results of the target primary cell and the to-be-activated secondary cell), RSRP / channel quality indicator (CQI) information of the to-be-activated secondary cell, and beam synchronization information of the to-be-activated secondary cell.

[0115] Exemplarily, the RSRP / CQI information of the to-be-activated secondary cell is associated with a secondary cell association / addition result (SCellAssResult). If the measured RSRP / CQI meets the preset threshold of the network, the SCellAssResult will be identified as a successful addition related state, and the terminal will report the RSRP / CQI information at this time, and the network can subsequently activate the SCell through MAC CE signaling. If the measured RSRP / CQI does not meet the preset threshold of the network, the SCellAssResult will be identified as a failed addition or to-be-optimized state, and the terminal will report the RSRP / CQI information at this time, and the network can subsequently adjust the SCell configuration through RRC reconfiguration signaling, such as replacing other candidate SCells or resetting the measurement threshold.

[0116] The beam synchronization information (SCellBeamSyncInfo) of the to-be-activated secondary cell includes but is not limited to at least one of the following: a valid timing advance (TA), acquired TCI state information, uplink beam association parameters, and the like. It should be understood that before activating the first secondary cell, the terminal device can receive the SCell configuration (including frequency point, physical cell identifier (PCI), transmission period and time domain location of SSB, and the like) issued by the network side, and after receiving the SCell configuration, the terminal device can perform scanning and synchronization detection on the to-be-activated SCell, thereby obtaining the beam state information of the to-be-activated secondary cell and buffering the beam state information. In this way, with the help of the beam synchronization information of the to-be-activated secondary cell, RACH-less can be achieved, that is, the terminal can complete synchronization with the secondary cell (uplink and / or downlink) without initiating a RACH process.

[0117] In a possible implementation, in a split architecture of the ORAN system, the first communication node comprises a source CU and a source DU. The terminal device sends second information to the source DU, which can be a measurement report of the terminal device, and the source DU sends the second information to the source CU.

[0118] Step S303 (optional): The first communication node determines a target secondary cell.

[0119] As an optional example, step S303 is an optional step.

[0120] Specifically, the first communication node receives second information of the terminal device, which can be a measurement report of the terminal device. In some examples, when a third parameter (such as an activation flag) carried in the second information has a value of 1, the first communication node can determine a target secondary cell from the secondary cells to be activated (i.e., candidate secondary cells) in combination with network load and the reported second information (such as one or more of the first measurement result and beam synchronization information of the secondary cell to be activated).

[0121] In yet some examples, when the third parameter (such as the activation flag) carried in the second information has a value of 0, the first communication node performs LTM switching according to a conventional process, without synchronously activating the secondary cell, i.e., without performing steps S303 to S306. In this example, the first communication node first determines a target primary cell after switching, and then determines and activates a target secondary cell after the terminal device accesses the target primary cell.

[0122] In a possible implementation, in a split architecture of the ORAN system, the first communication node comprises a source CU and a source DU, and the source DU receives second information of the terminal device. When a third parameter (such as an activation flag) carried in the second information has a value of 0, the source DU performs LTM switching according to a conventional process, without synchronously activating the secondary cell, i.e., without performing steps S303 to S306. When the third parameter (such as the activation flag) carried in the second information has a value of 1, the source DU determines a target secondary cell to be activated in combination with network load and terminal reported information, and reports to the source CU through a UE mobility command (UE Mobility Command), which in some examples carries a second identifier and beam synchronization information (SCellBeamSyncInfo) of the target secondary cell. Exemplarily, the second identifier can be represented as ActSCellIndex, which is used to indicate an index of the SCell to be activated.

[0123] Step S304 (optionally): The first communication node sends handover request information to the second communication node. Correspondingly, the second communication node receives the handover request information.

[0124] As an optional example, step S304 is an optional step.

[0125] In some examples, in the handover phase, the first communication node can filter out the LTM candidate cells meeting the conditions according to the measurement report message reported by the terminal device, and then the first communication node can further determine whether the candidate cells meet the handover standard by combining the network deployment scenario and the preset LTM event rule, and then determine the target serving cell from the candidate cells. After determining the target serving cell, the first communication node sends handover request information to the second communication node where the target serving cell is located, wherein the handover request information includes but is not limited to at least one of the following: configuration information of the target secondary cell and beam synchronization information of the target secondary cell, and then the second communication node can reserve resources for the target secondary cell based on the configuration information of the target secondary cell and the beam synchronization information of the target secondary cell.

[0126] In an implementation, the handover request information can further include a second version number, which is used to indicate the configuration version number of the first item in the handover request phase. Specifically, in the handover request phase, the first communication node can determine the second version number in combination with the current network environment. It should be understood that the network environment in the handover request phase can be different from that in the pre-configuration phase. In order to ensure the consistency of the secondary cell activation configuration, the current network environment needs to be evaluated again in the handover request phase to determine the configuration version number of the first item in this phase.

[0127] In yet another implementation, the handover request information can further include a first parameter and a second parameter to synchronize the current network configuration to the second communication node.

[0128] In one possible implementation, in the split architecture of the ORAN system, the first communication node includes a source CU and a source DU, and the second communication node includes a target CU and a target DU. The source CU sends a HANDOVER REQUEST signaling message to the target CU, which adds at least one of the following: sCellActConfiguration information element (configuration information of the target secondary cell) for synchronizing the configuration of the SCell to be activated; SCellBeamSyncInfo (beam synchronization information of the target secondary cell), CATypeFlag (CA type identifier, i.e., the first parameter), LTMTypeFlag (LTM type identifier, i.e., the second parameter); NewSCellActConfigVer (new SCell activation configuration version number, i.e., the second version number) to realize the configuration verification of the target CU. The source CU further sends NewSCellActConfigVer to the source DU through an LTM handover command (LTM_SwitchCommand).

[0129] Step S305 (optionally): The first communication node sends third information to the terminal device. Correspondingly, the terminal device receives the third information.

[0130] As an optional example, step S305 is an optional step.

[0131] In some examples, during handover, i.e., after determining the target secondary cell, the first communication node sends third information to the terminal device. This third information includes, but is not limited to, at least one of the following: a first identifier (e.g., PCellIndex), a second identifier, and a second version number (e.g., NewSCellActConfigVer). The first identifier indicates the target primary cell during inter-site handover, and the second version number indicates the configuration version number corresponding to the first item during the handover request phase. The second identifier includes the index of the target secondary cell (e.g., SCellIndex) and a third parameter (e.g., activationFlag). When the third parameter is 1 (or true), the second identifier indicates that the target secondary cell can be activated synchronously during inter-site handover; when the third parameter is 0 (or false), the second identifier indicates that the target secondary cell is not activated synchronously during inter-site handover.

[0132] In one possible implementation, in the split architecture of the ORAN system, the first communication node includes a source CU and a source DU. During handover, the source DU sends a configuration including activationFlag, SCellIndex, PCellIndex and NewSCellActConfigVer to the terminal device via MAC CE to trigger the handover to the target secondary cell.

[0133] Step S306 (optionally): The terminal device activates the target secondary cell based on third information.

[0134] In some examples, the terminal device receives third information to perform a handover operation. During the handover to the target primary cell corresponding to the first identifier, if the first version number in the pre-configuration phase is consistent with the second version number in the handover phase, it indicates that the current network situation is basically consistent with the network situation of the pre-configured node, indicating that the channel state has not changed much. The terminal device can activate the target secondary cell based on the beam synchronization information of the secondary cell to be activated while handing over to the target primary cell, so as to complete the uplink and downlink synchronization with the target secondary cell.

[0135] In some other examples, if the first version number in the pre-configuration phase is inconsistent with the second version number in the handover phase, it indicates that the current network situation is inconsistent with the network situation of the pre-configured node, indicating that the channel state has changed. The terminal device cannot activate the target secondary cell based on the beam synchronization information of the secondary cell to be activated. In this case, the terminal device only switches to the target primary cell and does not activate the target secondary cell synchronously.

[0136] In one possible implementation, in the separate architecture of the ORAN system, after the terminal device receives the MACCE from the source CU, it first verifies the consistency of NewSCellActConfigVer. If the two version numbers are consistent, when performing the target PCell handover, the pre-stored SCellBeamSyncInfo is reused to directly complete the SCell synchronization activation, skipping the re-measurement step after the handover.

[0137] In some other examples, after the terminal device switches to the target primary cell and activates the target secondary cell, it sends a fourth message to the second communication node (such as the target DU). The fourth message includes a first indication message and a second indication message. The first indication message is used to instruct the terminal device to switch from the source primary cell to the target primary cell based on the LTM mechanism. The second indication message is used to indicate that the target secondary cell has been activated and that the target primary cell and the target secondary cell are within the coverage area of ​​the second communication node's wireless network.

[0138] In the split architecture of the ORAN system, the second communication node includes a target CU and a target DU, the terminal device sends a MAC CE to the target DU, the MAC CE indicates an LTM cell switch complete, and the MAC CE adds SCellIndex and SCellActStatus (i.e., SCell activation status) to feed back the activation result of the SCell (for example, activated, not activated, or dormant state). Then, the target DU forwards the terminal feedback result to the target CU through MessageTransfer signaling, the target CU receives the feedback and confirms that the switching and SCell activation are completed, starts the CA resource scheduling of the PCell and the SCell in the MCG, and sends a resource-release-command signaling to the source CU to complete the release of the relevant resources on the source side.

[0139] Exemplarily, in the inter-CU MCG LTM scenario, the cells involved in the switching belong to two different CUs respectively, and the switching is for the cells in the MCG, for example, the primary cell of the current MCG of the UE (i.e., the source primary cell) belongs to the management of the first communication node (for example, CU1), when the network side judges that the switching is needed according to the L1 measurement report of the UE, the target cell belongs to the second communication node (for example, CU2), and the target cell after the switching will become the new MCG primary cell. In order to guarantee the switching efficiency, the network will configure the target cell across the CUs as the LTM candidate cell through the RRC signaling in advance, so that the whole switching process can be completed through the LTM mechanism without complex L3 layer signaling interaction.

[0140] Please refer to Figure 4 , Figure 4 is a flowchart of a communication method provided by an embodiment of the present application, and the method includes but is not limited to the following steps: S41: The source CU issues an activation configuration to the UE.

[0141] Wherein, the activation configuration refers to RRC Reconfiguration, including but not limited to at least one of the following: candidateCellId (candidate cell identifier), sCellToAddModList (to be added / modified secondary cell list), CATypeFlag for indicating CA type; LTMTypeFlag for distinguishing LTM and C-LTM; SCellActConfigVersion for ensuring consistency of target CU and UE on SCell activation configuration in Inter-CU scenario; SCellActEventConfig for providing L1 event triggered measurement threshold (such as specific RSRP threshold / RSRQ threshold) to support UE autonomous judgment of activation condition.

[0142] S42: UE performs L1 / L3 measurement and autonomously judges the activation condition, and reports the measurement result to the source DU.

[0143] Exemplarily, the UE performs L1 / L3 level measurement on the target SpCell and SCell, and judges the activation condition according to the preconfigured SCellActEventConfig: only when CATypeFlag=1 (co-site CA), LTMTypeFlag=1 (LTM mode) and the L1 trigger condition set by SCellActEventConfig is met, the activationFlag (activation flag) is set to 1, indicating that synchronous activation can be performed.

[0144] Then, the UE reports the measurement result, i.e. MeasurementReport, to the source DU, which needs to include the L1 / L3 measurement result of the target SpCell / SCell, sCellAssResult of RSRP / CQI information of the synchronous feedback SCell, activationFlag for judging the activation condition, and SCellBeamSyncInfo indicating the DL / UL synchronization state (such as the acquired TCI state, valid TA value) of the SCell to be activated to support RACH-less synchronous activation.

[0145] S43: The source DU determines the SCell to be activated and its configuration and reports to the source CU.

[0146] Exemplarily, if activationFlag=0, the source DU performs LTM switching according to the conventional process without synchronously activating the SCell; if activationFlag=1, the source DU determines the SCell to be activated in combination with the network load and the UE reported information, and reports the SCell to be activated to the source CU through the UEMobilityCommand, and the command needs to add ActsCellIndex (SCell index to be activated) and SCellBeamSyncInfo.

[0147] S44: Switching preparation, the source CU sends a handover request to the target CU for synchronous configuration.

[0148] Exemplarily, in the switching preparation stage, the source CU sends a handover request signaling to the target CU, and the signaling adds: an sCellActConfiguration information element for synchronously configuring the SCell to be activated; SCellBeamSyncInfo, CATypeFlag, and LTMTypeFlag; and NewSCellActConfigVer (new SCell activation configuration version number) for realizing configuration verification of the target CU. The source CU further sends the NewSCellActConfigVer to the source DU through an LTM_SwitchCommand.

[0149] S45: The source DU sends a MAC CE to the UE to trigger PSCell switching and SCell synchronous activation.

[0150] Exemplarily, when the switching is performed, the source DU sends a configuration including activationFlag, sCellIndex, and NewSCellActConfigVer to the UE through a MAC CE to trigger the switching. S46: The UE verifies the version number and determines whether to perform synchronous activation according to the verification result.

[0151] Exemplarily, after the UE receives the MAC CE, the UE first verifies the consistency of the NewSCellActConfigVer. If the version numbers are consistent, the UE performs target PCell switching and directly completes SCell synchronous activation by reusing the pre-stored SCellBeamSyncInfo, and skips the re-measurement link after the switching.

[0152] S47: After the switching is completed, the UE feeds back an activation state, and the target CU triggers the source CU to release resources.

[0153] Exemplarily, after the handover is completed, the UE sends an LTM Cell Switch Complete MAC CE to the target DU, the MAC CE adds sCellIndex and sCellActStatus (SCell activation status) to feed back the activation result of the SCell. Then the target DU forwards the UE feedback result to the target CU through MessageTransfer signaling. After the target CU receives the feedback and confirms that the handover and SCell activation are both completed, it starts the CA resource scheduling of the PCell and the SCell in the MCG, and sends a Resource-Release-Command signaling to the source CU to complete the release of the relevant resources on the source side. In this way, the MCG link (such as the user plane data path) of the terminal device can be seamlessly migrated from the current master node CU (i.e. the source CU) serving it to another target CU (the target CU).

[0154] Please refer to Figure 5 , Figure 5 is a signaling interaction schematic diagram in a split architecture of an ORAN system provided by an embodiment of the present application, as shown in Figure 5 , the ORAN system includes two control units CU_A and CU_B, and the ORAN system can also include at least one DU subordinate to CU_A and CU_B, such as DU_A1 subordinate to CU_A. Among them, CU_A and DU_A1 belong to a first communication node, and CU_B belongs to a second communication node.

[0155] As can be seen from Figure 5 , the terminal device UE1 is in the PCell_A covered by CU_A. Due to the movement of UE1, CU_A detects that UE1 may soon be handed over to the PCell_B of CU_B, and the PCell_A, the PCell_B and at least one SCell are in the same MCG. In this case, the signaling interaction includes but is not limited to the following steps: S1: CU_A sends RRCReconfiguration to DU_A1.

[0156] Among them, RRCReconfiguration includes at least one of the following parameters: CATypeFlag=1; LTMTypeFlag=1; SCellActCongfigVersion=v1.0; SCellActEventConfig, including Activation_Threshold_A1, Threshold: RSRP>-90dBm, RSRQ>=-10dB.

[0157] S2: DU_A1 sends RRCReconfiguration to UE1.

[0158] S3: UE1 performs L1 / L3 measurement and makes a decision.

[0159] Illustratively, UE1 measures the candidate cell and obtains the RSRQ of the target PCell = -95dBm; UE measures the candidate cell and obtains the RSRP of the target SCell = -88dBm, RSRQ = -8dB, because the measured RSRP of the SCell = -88dBm meets the SCellActEventConfig, it is determined that the decision result is activationFlag = 1.

[0160] S4: UE1 sends MeasurementReport to DU_A1.

[0161] Wherein, MeasurementReport includes the RSRP / RSRQ measurement result of the target PCell; activationFlag = 1; SCellAssResult: includes the RSRP / CQI of the SCell; SCellBeamSyncInfo: includes the synchronized Beamindex = 2, and the effective TA offset = 1.2μs, etc.

[0162] S5: DU_A1 sends UEMobilityCommand to CU_A.

[0163] Wherein, UEMobilityCommand includes ActSCellIndex = 5, SCellBeamSyncInfo, etc.

[0164] S6: CU_A sends handover request to CU_B.

[0165] Wherein, handover request includes the handover information of the target PScell; SCellActConfiguration, including the configuration information of the SCell with ActSCellIndex = 5, SCellBeamSyncInfo, NewSCellActCongfigVersion = v2.0. It can be seen that, at the time of handover, because of the change of network environment, the configuration is changed, therefore, the SCell activation configuration version number (ActCongfigVersion) also changes.

[0166] S7: CU_A sends LTM_Switch command to DU_A1.

[0167] Wherein, the LTM_Switch command includes candidateCellID, NewSCellActCongfigVersion = v2.0, and the like.

[0168] S8: DU_A1 sends a MAC CE to UE1.

[0169] Wherein, the MAC CE includes activationFlag = 1, SCellIndex = 5, NewSCellActCongfigVersion = v2.0, and the like.

[0170] S9: UE1 performs switching.

[0171] In some examples, since SCellActCongfigVersion and NewSCellActCongfigVersion do not match, UE1 only switches to the target PCell, and does not activate the target SCell.

[0172] It should be understood that each step in the above method embodiments provided by the present application can be completed by integrated logic circuits of hardware in the processor or instructions in the form of software. The method steps disclosed in combination with the embodiments of the present application can be directly embodied as hardware processor execution, or executed by a combination of hardware and software modules in the processor.

[0173] The present application divides the function modules of the communication device according to the above method embodiments, for example, each function module can be divided according to each function, or two or more functions can be integrated in one processing module. The above integrated module can be realized in the form of hardware or software function module. It should be noted that the division of the modules in the present application is illustrative, and is only a logical function division. In actual implementation, there can be another division method. The communication device of the present application will be described in detail below. Figure 6 and Figure 7 The communication device of the present application embodiment is described in detail.

[0174] Figure 6 is a structural schematic diagram of a communication device provided by the present application embodiment, as shown in Figure 6As shown, the communication apparatus includes a processing module 601 and a transceiver module 602. The transceiver module 602 can implement corresponding communication functions, and can also be referred to as an interface, a communication interface, or a communication module, etc. The processing module 601 is configured to perform data processing, such as generating information operations, etc. The transceiver module 602 can have a control logic or can be controlled by the processing module 601 to perform corresponding operations. In some embodiments of the present application, the communication apparatus can be used to perform the actions performed by the sending end in the above method embodiments, such as the sending end being the device itself or a chip or functional module configurable in the device, etc. The transceiver module 602 is configured to perform the operations related to information transmission in the above method embodiments, and the processing module 601 is configured to perform the operations related to data processing in the above method embodiments. The processing module 601 can perform corresponding operations by invoking a computer program, or can perform corresponding operations by a corresponding hardware circuit. The transceiver module 602 can independently perform the transmission and reception operations, or can perform the corresponding transmission and reception operations under the control of the processing module 601.

[0175] For example, Figure 6 The communication apparatus can be a terminal device or a device in a terminal device, and the processing module 601 and the transceiver module 602 in the communication apparatus can perform the following operations respectively. The transceiver module 602 is configured to receive first information of a first communication node, wherein the first information includes one or more of the following: a first parameter, a second parameter, and a first condition, the first parameter is used to indicate a carrier aggregation (CA) type, the second parameter is used to indicate a layer 1 / layer 2 triggered mobility (LTM) type, and the first condition includes a trigger condition of a first event, the first event including synchronously activating a secondary cell when the terminal device performs an inter-site handover; The processing module 601 is configured to, in a case where the first parameter indicates that the CA type is a co-sited CA and the second parameter indicates that the LTM type is one-time LTM, send, in response to the first condition being met, second information to the first communication node through the transceiver module 602, wherein the second information includes a third parameter, and the third parameter is used to represent that the terminal device synchronously activates a target secondary cell when performing the inter-site handover.

[0176] In a possible implementation, the processing module 601 is specifically configured to, in response to the first measurement result meeting the first condition, send the second information to the first communication node through the transceiver module 602, wherein the first measurement result includes a layer 1 measurement result of a first serving cell of the terminal device, and the first serving cell includes a target primary cell and an activated secondary cell.

[0177] In some examples, the second information further includes the first measurement result and beam synchronization information of the activated secondary cell, and the first communication node is configured to determine a target secondary cell from the activated secondary cell based on the first measurement result and the beam synchronization information of the activated secondary cell.

[0178] In a further possible implementation, the first information further comprises a first version number, the first version number being used to indicate a version number corresponding to the first matter in the pre-configuration phase, and the transceiver 602 is further configured to receive third information, the third information comprising the first identifier, a second identifier, and a second version number, wherein the first identifier is used to indicate the target primary cell, the second identifier is used to indicate the target secondary cell, and the second version number is used to indicate a version number corresponding to the first matter in the handover request phase; In the process of switching to the target primary cell, in the case that the first version number and the second version number are the same, the transceiver 602 is configured to activate the target secondary cell based on the beam synchronization information of the secondary cell to be activated.

[0179] In a further possible implementation, the transceiver 602 is further configured to send fourth information to the second communication node, wherein the fourth information comprises first indication information and second indication information, the first indication information is used to indicate that the terminal device switches to the target primary cell based on the LTM mechanism, and the second indication information is used to indicate that the target secondary cell has been activated, and the target primary cell and the target secondary cell are located in the coverage of the wireless network of the second communication node.

[0180] Multiplexing Figure 6 In some embodiments of the present application, exemplary, Figure 6 The communication apparatus can be a network device (such as the first communication node) or a device of the network device, and the processing module 601 and the transceiver 602 in the communication apparatus can perform the following operations respectively: The processing module 601 is configured to generate first information. The transceiver 602 is configured to send the first information to the terminal device, wherein the first information comprises one or more of the following: a first parameter, a second parameter, and a first condition, the first parameter is used to indicate a carrier aggregation (CA) type, the second parameter is used to indicate a layer 1 / layer 2 triggered mobility (LTM) type, and the first condition comprises a trigger condition of a first matter, the first matter comprising synchronously activating a secondary cell when the terminal device performs an inter-site handover; The transceiver 602 is further configured to receive second information of the terminal device, wherein the second information is sent by the terminal device in the case that the first parameter indicates that the CA type is co-sited CA, the second parameter indicates that the LTM type is one-time LTM, and the first condition is met, and the second information comprises a third parameter, the third parameter being used to represent that the terminal device synchronously activates a target secondary cell when performing an inter-site handover.

[0181] In some examples, the first condition is met, comprising that a first measurement result meets the first condition, the first measurement result comprising a layer 1 measurement result of a first serving cell of the terminal device, and the first serving cell comprising the target primary cell and the secondary cell to be activated.

[0182] In a possible implementation, the second information further comprises the first measurement result and beam synchronization information of the to-be-activated secondary cell; the processing module 601 is configured to determine a target secondary cell from the to-be-activated secondary cell based on the first measurement result and the beam synchronization information of the to-be-activated secondary cell.

[0183] In another possible implementation, the transceiver module 602 is further configured to send third information, the third information comprising a first identifier, a second identifier and a second version number, wherein the first identifier is used to indicate the target primary cell, the second identifier is used to indicate the target secondary cell, and the second version number is used to indicate a version number corresponding to the first matter in the handover request phase. The first information further comprises a first version number, the first version number being used to indicate a version number corresponding to the first matter in the pre-configuration phase, and in the process of switching the terminal device to the target primary cell, the beam synchronization information of the to-be-activated secondary cell is used to activate the target secondary cell by the terminal master device in the case that the first version number and the second version number are the same.

[0184] In another possible implementation, the transceiver module 602 is further configured to send handover request information to the second communication node, wherein the handover request information comprises configuration information of the target secondary cell and beam synchronization information of the target secondary cell, the second communication node is configured to reserve resources for the target secondary cell based on the configuration information of the target secondary cell and the beam synchronization information of the target secondary cell, and the target primary cell and the target secondary cell are located in the coverage of a wireless network of the second communication node. The transceiver module 602 is further configured to receive handover request confirmation information of the second communication node, wherein the handover request confirmation information is used to indicate that the resources have been reserved for the target secondary cell.

[0185] The specific description of the transceiver module and the processing module in each of the above embodiments is only an example. For the specific functions or steps of the transceiver module and the processing module, reference can be made to the above method embodiments, and details are not described here.

[0186] The above introduces the communication device of the embodiment of the application, and the following introduces possible product forms of the communication device. Any form of product that has the functions of the communication device described above falls within the protection scope of the embodiment of the application. Figure 6 The above introduces the communication device of the embodiment of the application, and the following introduces possible product forms of the communication device. Any form of product that has the functions of the communication device described above falls within the protection scope of the embodiment of the application.

[0187] The following introduction is only an example, and the product form of the communication device of the embodiment of the application is not limited to this.

[0188] In a possible implementation, Figure 6In the illustrated communication apparatus, the processing module 601 can be one or more processors, and the transceiver module 602 can be a transceiver, or the transceiver module 602 can also be a sending module and a receiving module, the sending module can be a transmitter, and the receiving module can be a receiver, which are integrated in one device, for example, a transceiver. In the embodiments of the present application, the processor and the transceiver can be coupled, and the connection mode of the processor and the transceiver is not limited in the embodiments of the present application. In the process of executing the above method, the process of sending information in the above method can be the process of outputting the above information by the processor. When the above information is output, the processor outputs the above information to the transceiver, so that the transceiver transmits. After the above information is output by the processor, it can also need to be processed further, and then reach the transceiver. Similarly, the process of receiving information in the above method can be the process of receiving the input above information by the processor. When the processor receives the input information, the transceiver receives the above information and inputs it to the processor. In addition, after the transceiver receives the above information, the above information can need to be processed further, and then input to the processor.

[0189] As shown in Figure 7 , the communication apparatus 70 includes one or more processors 720 and a transceiver 710. For example, the transceiver 710 is configured to perform the functions or steps performed by the transceiver module 602 as shown in Figure 6 , and the processor 720 is configured to perform the functions or steps performed by the processing module 601 as shown in Figure 6 . The transceiver 710 can have processing logic itself or perform operations under the control of the processor 720. Optionally, the communication apparatus 70 can further include a memory 730, which can store computer programs. The processor 720 performs some operations, such as generating the first registration request, generating the first inventory response, and the like, by invoking the computer programs in the memory 730. For specific descriptions of the processor 720 and the transceiver 710, refer to the method embodiments in Figure 6 or the above, which will not be described here in detail. In each of the above embodiments, refer to the descriptions of related steps and information in the above method embodiments, which will not be described here one by one. In Figure 7 each implementation of the communication apparatus shown, the transceiver can include a receiver and a transmitter, the receiver is configured to perform the functions (or operations) of receiving, and the transmitter is configured to perform the functions (or operations) of transmitting. The transceiver is configured to communicate with other devices / apparatuses through a transmission medium.

[0190] The application further provides a chip system comprising at least one processor for implementing the functions involved in the method performed by the communication node, or the access network device, or the core network device in any one of the above embodiments.

[0191] In a possible design, the chip system further comprises a memory for storing program instructions and data, and the memory is located in or out of the processor.

[0192] The chip system can be composed of a chip, or can comprise a chip and other discrete devices.

[0193] Optionally, the processor in the chip system can be one or more. The processor can be implemented by hardware or software. When implemented by hardware, the processor can be a logic circuit, an integrated circuit, etc. When implemented by software, the processor can be a general-purpose processor, and the implementation is achieved by reading software codes stored in the memory.

[0194] Optionally, the memory in the chip system can also be one or more. The memory can be integrated with the processor, or can be arranged separately from the processor, and the embodiments of the application do not make any limitation in this aspect. For example, the memory can be a non-transient processor such as a read-only memory (ROM), which can be integrated on the same chip as the processor, or can be arranged on different chips respectively, and the embodiments of the application do not make any limitation on the type of the memory and the arrangement manner of the memory and the processor.

[0195] For example, the chip system 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 chip.

[0196] The present application also provides a computer program product, which comprises a computer program (also referred to as code or instructions), which, when executed, causes a computer to perform the method performed by the communication node, or the access network device, or the core network device in any one of the above embodiments.

[0197] The present application also provides a computer readable storage medium, which stores a computer program (also referred to as code or instructions). When the computer program is executed, it causes a computer to perform the method performed by the communication node, or the access network device, or the core network device in any one of the above embodiments.

[0198] The embodiments of the present application can be combined in any manner to achieve different technical effects.

[0199] In the above embodiments, all or part of the embodiments can be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part of the embodiments can be implemented in the form of a computer program product. The computer program product comprises one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the present application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network or other programmable device. The computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another, for example, the computer instructions can be transferred from one website, computer, server or data center to another website, computer, server or data center through wired (such as coaxial cable, optical fiber, digital subscriber line) or wireless (such as infrared, wireless, microwave, etc.) mode. The computer readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains one or more available media sets. The available media can be magnetic media (such as floppy disk, hard disk, magnetic tape), optical media (such as DVD), or semiconductor media (such as solid state disk), etc.

[0200] Those of ordinary skill in the art can understand that all or part of the processes in the above embodiments can be implemented by a computer program to instruct the relevant hardware, which can be stored in a computer readable storage medium. The program, when executed, can include the processes of the above method embodiments. The storage medium mentioned above includes ROM or random access memory (RAM), magnetic disk or optical disk, and various media that can store program codes.

[0201] In summary, the above only describes the embodiments of the technical scheme of the present application, and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made according to the disclosure of the present application shall be included in the protection scope of the present application.

[0202] In various embodiments of the present application, the terms and / or descriptions between different embodiments are consistent and can be mutually referred to if there is no special description and logical conflict. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0203] In the description of the present application, the words "first", "second", "S301", or "S302" and the like are only used for the purpose of distinguishing the description and the convenience of context writing, and the different order numbers themselves do not have specific technical meanings, cannot be understood as indicating or implying relative importance, and cannot be understood as indicating or implying the execution order of the operation. The execution order of each process should be determined according to its function and inherent logic.

Claims

1. A communication method characterized by comprising: The method is applied to a terminal device and comprises: receiving first information of a first communication node, wherein the first information comprises one or more of a first parameter, a second parameter, and a first condition, the first parameter is used to indicate a carrier aggregation (CA) type, the second parameter is used to indicate a layer 1 / layer 2 triggered mobility (LTM) type, and the first condition comprises a trigger condition of a first event, the first event comprising synchronous activation of a target secondary cell when the terminal device performs an inter-site handover; in a case where the first parameter indicates that the CA type is a co-sited CA and the second parameter indicates that the LTM type is one-time LTM, sending second information to the first communication node in response to the first condition being met, wherein the second information comprises a third parameter, and the third parameter is used to represent synchronous activation of the target secondary cell when the terminal device performs an inter-site handover.

2. The method of claim 1, wherein, The sending of the second information to the first communication node in response to the first condition being met comprises: sending the second information to the first communication node in response to a first measurement result meeting the first condition, wherein the first measurement result comprises a layer 1 measurement result of a first serving cell of the terminal device, and the first serving cell comprises a target primary cell and an activated secondary cell.

3. The method of claim 2, wherein, The second information further comprises the first measurement result and beam synchronization information of the activated secondary cell, and the first communication node is configured to determine the target secondary cell from the activated secondary cell based on the first measurement result and the beam synchronization information of the activated secondary cell.

4. The method of claim 3, wherein, The first information further comprises a first version number, the first version number is used to indicate a version number corresponding to the first event in a pre-configuration stage, and the method further comprises: receiving third information, the third information comprising a first identifier, a second identifier, and a second version number, wherein the first identifier is used to indicate the target primary cell, the second identifier is used to indicate the target secondary cell, and the second version number is used to indicate a version number corresponding to the first event in a handover request stage; in a process of handover to the target primary cell, in a case where the first version number and the second version number are the same, activating the target secondary cell based on the beam synchronization information of the activated secondary cell.

5. The method of claim 4, wherein, The method further comprises: sending fourth information to a second communication node, wherein the fourth information comprises first indication information and second indication information, the first indication information is used to indicate that the terminal device performs handover to the target primary cell based on an LTM mechanism, and the second indication information is used to indicate that the target secondary cell has been activated, and the target primary cell and the target secondary cell are located in a coverage range of a wireless network of the second communication node.

6. A communication method characterized by comprising: The method is applied to a first communication node and comprises: sending first information to a terminal device, wherein the first information comprises one or more of the following: a first parameter, a second parameter, and a first condition, the first parameter is used to indicate a carrier aggregation (CA) type, the second parameter is used to indicate a layer 1 / layer 2 triggered mobility (LTM) type, and the first condition comprises a trigger condition of a first event, the first event comprises synchronously activating a secondary cell when the terminal device performs an inter-site handover; receiving second information of the terminal device, wherein the second information is sent by the terminal device when the first parameter indicates that the CA type is a co-sited CA, the second parameter indicates that the LTM type is a one-time LTM, and the first condition is met, and the second information comprises a third parameter, the third parameter is used to represent a target secondary cell that is synchronously activated by the terminal device when performing an inter-site handover.

7. The method of claim 6, wherein, The first condition is met by a first measurement result meeting the first condition, and the first measurement result comprises a layer 1 measurement result of a first serving cell of the terminal device, and the first serving cell comprises a target primary cell and an activated secondary cell.

8. The method of claim 7, wherein, The method further comprises: The second information further comprises the first measurement result and beam synchronization information of the activated secondary cell. The target secondary cell is determined from the activated secondary cell based on the first measurement result and the beam synchronization information of the activated secondary cell.

9. The method of claim 8, wherein, The method further comprises: sending third information, the third information comprises a first identifier, a second identifier, and a second version number, wherein the first identifier is used to indicate the target primary cell, the second identifier is used to indicate the target secondary cell, and the second version number is used to indicate a version number corresponding to the first event in a handover request phase; The first information further comprises a first version number, the first version number is used to indicate a version number corresponding to the first event in a pre-configuration phase, and in a process of the terminal device switching to the target primary cell, the beam synchronization information of the activated secondary cell is used for the terminal device to activate the target secondary cell when the first version number and the second version number are the same.

10. The method of claim 9, wherein, The method further comprises: sending handover request information to a second communication node, wherein the handover request information comprises configuration information of the target secondary cell and beam synchronization information of the target secondary cell, the second communication node is used to reserve resources for the target secondary cell based on the configuration information of the target secondary cell and the beam synchronization information of the target secondary cell, and the target primary cell and the target secondary cell are located within a coverage range of a wireless network of the second communication node; receiving handover request confirmation information of the second communication node, wherein the handover request confirmation information is used to indicate that resources have been reserved for the target secondary cell.

11. A communications device, characterized by The communication device comprises a module for performing the method of any one of claims 1 to 5; or the communication device is configured to perform the method of any one of claims 6 to 10. ​ 12. A communications device, characterized by The communication device comprises a processor for executing computer programs or computer instructions in a memory to perform the method of any of claims 1 to 10.

13. A computer-readable storage medium, characterized in that, The computer readable storage medium is for storing a computer program which, when executed by a communication device, causes the communication device to perform the method of any of claims 1 to 10.

14. A computer program product comprising instructions, characterized in that, The computer program product, when running on a processor, implements the method of any of claims 1 to 10.

15. A chip system, characterized by comprises a processor; The processor is configured to execute computer instructions to cause a device in which the chip system is installed to perform the method of any of claims 1 to 10.

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