Method and apparatus in a node for wireless communication

Abstract

The invention provides a method and a device in a node for wireless communication. The method comprises the following steps: a first node receives first information; wherein the first information comprises configuration information of at least two candidate cells for carrier aggregation, and the configuration information comprises primary and secondary types of a first cell and a second cell; when the first node is switched to the first cell based on a layer 1 / layer 2, carrier aggregation communication is carried out at least on the first cell and the second cell, the first cell is used as a main cell of carrier aggregation, and the second cell is used as an auxiliary cell of carrier aggregation.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and more particularly, to a method and apparatus in a node for wireless communication. Background Art

[0002] With the continuous development of communication technology, various mobility management methods have emerged, one of which is the Layer 1 / 2 triggered mobility (LTM) mechanism. In the LTM mechanism, due to the lengthy radio resource control (RRC) process, the terminal cannot transmit data at a high data rate for a period of time after being handed over to the target cell before carrier aggregation (CA) is configured, resulting in a window of low data transmission rate. Summary of the Invention

[0003] The present application provides a method and apparatus in a node for wireless communication. The following introduces various aspects of the present application.

[0004] In a first aspect, a method in a first node for wireless communication is provided, comprising: receiving first information; wherein the first information includes configuration information of at least two candidate cells for carrier aggregation, the configuration information including primary and secondary types of the first cell and the second cell;

[0005] When the first node switches to the first cell based on layer 1 / layer 2, carrier aggregation communication is performed on at least the first cell and the second cell, wherein the first cell is used as a primary cell for carrier aggregation and the second cell is used as a secondary cell for carrier aggregation.

[0006] In a second aspect, a method in a first node for wireless communication is provided, comprising: receiving a first handover command message and a second handover command message, the first handover command message being used to notify the first node to hand over to a first cell, the second handover command message being used to notify the first node to hand over to a second cell;

[0007] When the first node switches to the first cell based on layer 1 / layer 2, carrier aggregation communication is performed on at least the first cell and the second cell, wherein the first cell is used as a primary cell for carrier aggregation and the second cell is used as a secondary cell for carrier aggregation.

[0008] According to a third aspect, a method is provided in a second node for wireless communication, comprising: sending first information; wherein the first information includes configuration information of at least two candidate cells for carrier aggregation, and the configuration information includes the primary and secondary types of the first cell and the second cell; the first information is used to indicate that when the first node switches to the first cell based on layer 1 / layer 2, carrier aggregation communication is performed at least on the first cell and the second cell, wherein the first cell is used as the primary cell for carrier aggregation, and the second cell is used as the secondary cell for carrier aggregation.

[0009] In a fourth aspect, a method is provided in a second node for wireless communication, comprising: sending a first switching command message and a second switching command message, the first switching command message being used to notify the first node to switch to the first cell, and the second switching command message being used to notify the first node to switch to the second cell; the first switching command message and the second switching command message being used to indicate that when the first node switches to the first cell based on layer 1 / layer 2, carrier aggregation communication is performed at least on the first cell and the second cell, wherein the first cell is used as the primary cell for carrier aggregation, and the second cell is used as the secondary cell for carrier aggregation.

[0010] In a fifth aspect, a first node for wireless communication is provided, comprising a first transceiver module, configured to receive first information; wherein the first information includes configuration information of at least two candidate cells for carrier aggregation, the configuration information including primary and secondary types of the first cell and the second cell;

[0011] The first processing module is used to perform carrier aggregation communication on at least the first cell and the second cell when the first node switches to the first cell based on layer 1 / layer 2, wherein the first cell is used as the primary cell for carrier aggregation and the second cell is used as the secondary cell for carrier aggregation.

[0012] In a sixth aspect, a first node for wireless communication is provided, comprising a first transceiver module configured to receive a first handover command message and a second handover command message, wherein the first handover command message is used to notify the first node to handover to a first cell, and the second handover command message is used to notify the first node to handover to a second cell;

[0013] The first processing module is used to perform carrier aggregation communication on at least the first cell and the second cell when the first node switches to the first cell based on layer 1 / layer 2, wherein the first cell is used as the primary cell for carrier aggregation and the second cell is used as the secondary cell for carrier aggregation.

[0014] In the seventh aspect, a second node for wireless communication is provided, comprising a second transceiver module for sending first information; wherein, the first information includes configuration information of at least two candidate cells for carrier aggregation, and the configuration information includes the primary and secondary types of the first cell and the second cell; the first information is used to indicate that when the first node switches to the first cell based on layer 1 / layer 2, carrier aggregation communication is performed at least on the first cell and the second cell, wherein the first cell is used as the primary cell for carrier aggregation, and the second cell is used as the secondary cell for carrier aggregation.

[0015] In the eighth aspect, a second node for wireless communication is provided, including a second transceiver module, used to send a first switching command message and a second switching command message, the first switching command message is used to notify the first node to switch to the first cell, and the second switching command message is used to notify the first node to switch to the second cell; the first switching command message and the second switching command message are used to indicate that when the first node switches to the first cell based on layer 1 / layer 2, carrier aggregation communication is performed at least on the first cell and the second cell, wherein the first cell is used as the main cell for carrier aggregation, and the second cell is used as the secondary cell for carrier aggregation.

[0016] In a ninth aspect, an embodiment of the present application provides a communication system, the system including the first node and / or the second node described above. In another possible design, the system may also include other devices that interact with the first node or the second node in the solution provided in the embodiment of the present application.

[0017] In the tenth aspect, an embodiment of the present application provides a computer-readable storage medium, which stores a computer program, and the computer program enables a communication device (for example, a first node or a second node) to perform some or all of the steps in the methods of the above aspects.

[0018] In an eleventh aspect, embodiments of the present application provide a computer program product, wherein the computer program product includes a non-transitory computer-readable storage medium storing a computer program, wherein the computer program is operable to cause a communication device (e.g., a terminal device or a network device) to perform some or all of the steps of the methods described in each of the above aspects. In some implementations, the computer program product may be a software installation package.

[0019] In the twelfth aspect, an embodiment of the present application provides a chip, which includes a memory and a processor. The processor can call and run a computer program from the memory to implement some or all of the steps described in the methods of the above aspects.

[0020] This application achieves the purpose of high data rate transmission by enabling the terminal device to use the primary and secondary cells to form carrier aggregation in a timely manner after LTM switching, thereby improving the "low data rate window period" caused by LTM and achieving the purpose of stable high data rate transmission, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the LTM process for performing Layer 1 / Layer 2 triggering for a terminal.

[0022] Figure 2 The following is an example diagram of the system architecture of a wireless communication system to which the embodiments of the present application can be applied.

[0023] Figure 3 Schematic diagram of a network architecture to which the embodiments of the present application can be applied.

[0024] Figure 4 A flowchart of a method in a node for wireless communication provided in an embodiment of the present application.

[0025] Figure 5 A schematic diagram of configuration information including cell parameters in an embodiment of the present application can be applied.

[0026] Figure 6 A schematic diagram of configuration information including cell types in an embodiment of the present application can be applied.

[0027] Figure 7 A schematic diagram comparing LTM switching scenarios to which the embodiments of the present application can be applied.

[0028] Figure 8 A schematic diagram comparing another LTM switching scenario to which the embodiments of the present application can be applied.

[0029] Figure 9 A flowchart of another method in a node for wireless communication to which an embodiment of the present application can be applied is provided.

[0030] Figure 10 A schematic structural diagram of a first node for wireless communication provided in an embodiment of the present application.

[0031] Figure 11 A schematic structural diagram of a second node for wireless communication provided in an embodiment of the present application.

[0032] Figure 12 It is a structural diagram of a communication device provided in an embodiment of the present application.

[0033] Figure 13 A schematic diagram of the hardware modules of the communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0034] In some wireless communication systems, to reduce handover latency, terminal devices can be configured to perform Layer 1 (L1) / Layer 2 (L2) triggered mobility (LTM) procedures. That is, the target cell is pre-configured through RRC. When handover is required, the network side sends a MAC CE to notify the UE to switch to the target cell, such as Figure 1 As shown in Figure 2. In LTM, the UE can perform lower layer measurements on multiple candidate cells and report the measurement results to the network node via the lower layer (e.g., L1). Based on the reported measurement results, the network node can trigger the UE's cell handover behavior using lower layer signaling, such as triggering the UE's cell handover behavior via downlink control information (DCI) or media access control (MAC) control element (CE).

[0035] Compared with the traditional cell switching process triggered by RRC messages, the LTM process can avoid transmitting RRC switching commands that are too large in size when the channel between the UE and the source cell is very poor, thereby avoiding switching failures caused by switching command transmission failures and reducing communication interruptions caused by the switching process.

[0036] Figure 1 The flowchart of the LTM process is exemplarily described. The LTM process may include four phases: an LTM preparation phase, an advance synchronization phase, an LTM cell handover execution phase, and / or an LTM cell handover completion phase.

[0037] During the LTM preparation phase, at S105, the UE may be in an RRC connected state (also known as RRC_CONNECTED) with the source cell. At S110, the UE may send a measurement report to the gNB. The measurement report may indicate signal strength measurements or similar signal strength measurements associated with the source cell and / or one or more neighboring cells. At S115, the gNB initiates LTM cell preparation based on the received measurement report.

[0038] Subsequently, in S120, the source cell (the gNB corresponding to the source cell) may send an RRC reconfiguration message to the UE, which may include LTM candidate configuration information. Specifically, the RRC reconfiguration message may indicate the configuration of one or more LTM candidate target cells, which may refer to candidate cells that may subsequently become the UE's serving cell. In S125, the UE may store the configuration of the one or more LTM candidate cell configurations and, in response, send an RRC Reconfiguration Complete message to the source cell.

[0039] In the early synchronization phase, in S130a and S130b, the UE may perform downlink (DL) / uplink (UL) synchronization with one or more candidate cells associated with the LTM candidate cell configuration. For example, the UE may perform uplink and downlink synchronization and timing advance acquisition with one or more candidate target cells before receiving the LTM handover command. It should be understood that performing early synchronization with one or more candidate cells can reduce the waiting time associated with performing a random access channel (RACH) procedure later in the LTM process.

[0040] During the LTM cell handover execution phase, in S135, the UE may perform L1 measurements on the configured LTM candidate target cell and thereby send a lower layer (e.g., L1) measurement report to the source cell. In S140, the source cell may decide to perform LTM cell handover to the target cell. In S145, the source cell sends a command to the UE to trigger LTM cell handover, such as a MAC CE or similar message (MAC CE or similar message is sometimes referred to as a cell handover command in this document). The cell handover command may include an indication of a candidate configuration index associated with the candidate target cell. In S150, the UE receives the cell handover command, and the UE may apply the configuration parameters of the target cell to enable handover to the LTM candidate target cell (e.g., the UE may disconnect from the source cell and use the configuration of the target candidate cell). In addition, in S155, when the timing advance associated with the target candidate cell is not available, the UE performs a physical random access channel (RACH) process.

[0041] In the LTM cell handover completion phase, in S160 , the UE may complete the cell handover by sending a message to the base station; or the base station may complete the cell handover by sending a message or uplink resource allocation to the UE.

[0042] In summary, compared with the L3 switching process, the switching delay of LTM is lower.

[0043] However, in Figure 1 In the LTM handover process shown, when the UE's data rate is high, carrier aggregation (CA) needs to be configured. After the UE switches to the target cell, a secondary cell (SCell) must be configured and activated for the UE through the RRC process to support the high data rate. Because the RRC process is time-consuming, the UE cannot transmit data at a high data rate during this period, resulting in a window of low data rate.

[0044] To this end, this application provides some new technologies and devices to enable the UE to prepare SCell before LTM, so that after LTM, the UE uses the primary and secondary cells to form carrier aggregation to achieve the purpose of high data rate transmission, thereby improving the "low data rate window period" caused by LTM and achieving the purpose of stable high data rate transmission, thereby improving the user experience.

[0045] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0046] Communication system architecture

[0047] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: global system of mobile communication (GSM) system, code division multiple access (CDMA) system, wideband code division multiple access (WCDMA) system, general packet radio service (GPRS), long term evolution (LTE) system, advanced long term evolution (LTE-A) system, new radio (NR) system, NR system evolution system, LTE on unlicensed spectrum (LTE-U) system, NR on unlicensed spectrum (NR-U) system, non-terrestrial network (NTN) system, universal mobile telecommunication system (UMTS), wireless local area networks (WLAN), wireless fidelity (WLAN), etc. fidelity, WiFi), fifth-generation communication (5G) systems or other communication systems, such as future communication systems, such as sixth-generation mobile communication systems, and satellite communication systems.

[0048] Generally speaking, traditional communication systems support a limited number of connections and are easy to implement. However, with the development of communication technology, mobile communication systems will not only support traditional communications, but will also support, for example, device-to-device (D2D) communication, machine-to-machine (M2M) communication, machine-type communication (MTC), vehicle-to-vehicle (V2V) communication, or vehicle-to-everything (V2X) communication, and the embodiments of the present application can also be applied to these communication systems.

[0049] The communication system in the embodiment of the present application can be applied to a carrier aggregation (CA) scenario, a dual connectivity (DC) scenario, and a standalone (SA) networking scenario.

[0050] The communication system in the embodiment of the present application can be applied to an unlicensed spectrum, where the unlicensed spectrum can also be considered as a shared spectrum; or, the communication system in the embodiment of the present application can also be applied to an authorized spectrum, where the authorized spectrum can also be considered as a dedicated spectrum.

[0051] The embodiments of the present application can be applied to non-terrestrial network (NTN) systems as well as terrestrial network (TN) systems. By way of example and not limitation, NTN systems include NR-based NTN systems and cellular internet of things (IoT)-based NTN systems.

[0052] The embodiments of the present application describe various embodiments in conjunction with network equipment and terminal equipment, wherein the terminal equipment may also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station (MS), mobile terminal (MT), remote station, remote terminal, mobile device, user terminal, terminal, wireless communication equipment, user agent or user device, etc.

[0053] In an embodiment of the present application, the terminal device may be a station (STATION, ST) in a WLAN, a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA) device, a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a next-generation communication system such as a terminal device in an NR network, or a terminal device in a future-evolved public land mobile network (PLMN) network, etc.

[0054] In an embodiment of the present application, a terminal device may be a device that provides voice and / or data connectivity to a user and can be used to connect people, objects, and machines, such as a handheld device with wireless connection capabilities, an in-vehicle device, etc. The terminal device in the embodiment of the present application may be a mobile phone, a tablet computer, a laptop computer, a PDA, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, etc. Optionally, the terminal device can be used to act as a base station. For example, the terminal device can act as a scheduling entity that provides sidelink signals between terminal devices in V2X or D2D, etc. For example, a cellular phone and a car communicate with each other using sidelink signals. Cellular phones and smart home devices communicate with each other without relaying the communication signal through a base station.

[0055] In an embodiment of the present application, the terminal device can be deployed on land, including indoors or outdoors, handheld, wearable or vehicle-mounted; it can also be deployed on the water surface (such as ships, etc.); it can also be deployed in the air (such as airplanes, balloons and satellites, etc.).

[0056] In the embodiments of the present application, the terminal device may be a mobile phone, a tablet computer, a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical, a wireless terminal device in smart grid, a wireless terminal device in transportation safety, a wireless terminal device in smart city, or a wireless terminal device in smart home, etc. The terminal device involved in the embodiments of the present application may also be referred to as a terminal, user equipment (UE), access terminal device, vehicle-mounted terminal, industrial control terminal, UE unit, UE station, mobile station, mobile station, remote station, remote terminal device, mobile device, UE, wireless communication device, UE agent or UE device, etc. The terminal device may also be fixed or mobile.

[0057] As an example and not a limitation, in the embodiment of the present application, the terminal device may also be a wearable device. Wearable devices may also be called wearable smart devices, which are a general term for wearable devices that are intelligently designed and developed using wearable technology for daily wear, such as glasses, gloves, watches, clothing, and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothes or accessories. Wearable devices are not only hardware devices, but also achieve powerful functions through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include those that are fully functional, large in size, and can achieve complete or partial functions without relying on smartphones, such as smart watches or smart glasses, as well as those that only focus on a certain type of application function and need to be used in conjunction with other devices such as smartphones, such as various smart bracelets and smart jewelry for vital sign monitoring.

[0058] The network device in the embodiments of the present application may be a device for communicating with a terminal device, and may also be referred to as an access network device or a radio access network device. For example, the network device may be a base station. The network device in the embodiments of the present application may refer to a radio access network (RAN) node (or device) that connects a terminal device to a wireless network. A base station may broadly cover various names as follows, or be replaced with the following names, such as: NodeB, evolved NodeB (eNB), next generation NodeB (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point (TP), master station MeNB, secondary station SeNB, multi-standard radio (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. A base station may be a macro base station, a micro base station, a relay node, a donor node, or the like, or a combination thereof. The base station may also refer to a communication module, modem or chip provided in the aforementioned device or apparatus. The base station may also be a mobile switching center and a device-to-device D2D, vehicle-to-everything (V2X), machine-to-machine (M2M) communication device that performs the base station function, a network side device in a 6G network, a device that performs the base station function in a future communication system, etc. The base station may support networks with the same or different access technologies. The embodiments of the present application do not limit the specific technology and specific device form adopted by the network equipment.

[0059] Base stations can be fixed or mobile. For example, a helicopter or drone can be configured to act as a mobile base station, and one or more cells can move based on the location of the mobile base station. In other examples, a helicopter or drone can be configured to act as a device that communicates with another base station.

[0060] In some deployments, the network device in the embodiments of the present application may refer to a CU or a DU, or the network device may include a CU and a DU. The gNB may also include an AAU.

[0061] The network equipment and terminal devices can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; they can also be deployed in the air on aircraft, balloons, and satellites. The embodiments of this application do not limit the scenarios in which the network equipment and terminal devices are located.

[0062] As an example and not a limitation, in an embodiment of the present application, the network device may have a mobile feature, for example, the network device may be a mobile device. In some embodiments of the present application, the network device may be a satellite or a balloon station. For example, the satellite may be a low earth orbit (LEO) satellite, a medium earth orbit (MEO) satellite, a geostationary earth orbit (GEO) satellite, a high elliptical orbit (HEO) satellite, etc. In some embodiments of the present application, the network device may also be a base station set up in a location such as land or water.

[0063] In an embodiment of the present application, the network device can provide services for a cell, and the terminal device communicates with the network device through the transmission resources used by the cell (for example, frequency domain resources, or spectrum resources). The cell can be a cell corresponding to the network device (for example, a base station). The cell can belong to a macro base station or a base station corresponding to a small cell. The small cells here may include: metro cells, micro cells, picocells, femtocells, etc. These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-speed data transmission services.

[0064] It should be understood that all or part of the functions of the communication device in this application can also be implemented through software functions running on hardware, or through virtualization functions instantiated on a platform (such as a cloud platform).

[0065] Cell handover (HO) aims to improve the continuity of services provided by the communication system to terminal devices. In a wireless communication system, when a terminal device moves from one cell (also known as the "source cell") to another, in order to maintain communication, the terminal device needs to hand over to another cell (also known as the "target cell"). The cell can be a primary cell (PCell), a secondary cell (SCell), or a primary secondary cell (PSCell).

[0066] The cell switching in the embodiment of the present application can be a traditional switching mechanism or a conditional switching mechanism.

[0067] For example, Figure 2 This is a schematic diagram of the architecture of a communication system provided in an embodiment of the present application. Figure 2 As shown, the communication system 200 may include a network device 210, which may be a device that communicates with a terminal device 220 (or a communication terminal or terminal). The network device 210 may provide communication coverage for a specific geographic area and may communicate with terminal devices within the coverage area.

[0068] Figure 2 A network device and two terminal devices are shown as an example. In some embodiments of the present application, the communication system 200 may include multiple network devices and the coverage area of ​​each network device may include other numbers of terminal devices, which is not limited in the embodiments of the present application.

[0069] This application also provides various application scenarios associated with the LTM process, such as Figure 3 Three different cell handover scenarios are shown. Figure 3 In (a), the source cell and the target cell belong to the same DU, and the source cell and the target cell belong to the same CU. This switching method is called intra-CU cell switching. Figure 3 In (b), the source cell and the target cell belong to different DUs, but the source cell and the target cell belong to the same CU. This switching method is called intra-CU cell switching. Figure 3 In (c), the source cell and the target cell belong to different DUs, and the source cell and the target cell belong to different CUs. This switching mode is called inter-CU cell switching.

[0070] The following combination Figure 4 , a detailed introduction to the wireless communication method provided in the embodiments of the present application is given.

[0071] See also Figure 4, including the following steps: S410 and S420.

[0072] In S410 , a first node receives first information.

[0073] The first information includes configuration information of at least two LTM candidate cells (also referred to as candidate cells), and the configuration information includes primary and secondary types of the LTM candidate cells.

[0074] In S420, when the first node switches to the first cell based on layer 1 / layer 2, carrier aggregation communication is performed at least on the first cell (also known as the first candidate cell) and the second cell (also known as the second candidate cell), wherein the first cell is used as the primary cell for carrier aggregation and the second cell is used as the secondary cell for carrier aggregation.

[0075] In one possible implementation, the first node may be one of multiple terminal devices. The second node may be a network device corresponding to the current serving cell of the first node. The second node may also be referred to as a base station of a source cell, a CU of a source cell, or a CU of a serving cell.

[0076] In a possible implementation, the source cell or protocol may indicate the cell type of the LTM candidate cell.

[0077] In a possible implementation, the source cell may indicate the primary and secondary types of the LTM candidate cells in an RRC message in the LTM handover process, or indicate in the RRC message which cell in the LTM candidate is the PCell and which cell is the SCell.

[0078] Optionally, a single LTM candidate cell identifier (LTM-Candidate ID) in the RRC message structure may be bound to cell parameters of at least two cells, that is, a single LTM candidate may include N groups of cell parameters, each group of cell parameters corresponds to one cell, and N is a natural number greater than 1.

[0079] For example, Figure 5 As shown, Figure 5 (a) in the figure illustrates the configuration information of the LTM candidate cell sent by the traditional base station. The configuration information includes an LTM candidate cell identifier, and the LTM candidate cell identifier is bound to the parameters of a cell. Figure 5 (b) in FIG. 1 illustrates the configuration information of the LTM candidate cell sent by the base station in this embodiment. The configuration information includes an LTM candidate cell identifier. An LTM candidate includes two groups of cell parameters. It should be understood that Figure 5 (b) is just an example, and an LTM candidate may also include three or more groups of cell parameters.

[0080] In this embodiment, each group of cell parameters may include LTM-CandidatePCI, LTM-SSB-Config, LTM-Candidate Config, LTM-EarlyUL-SynConfig, LTM-EarlyUL-SynConfigSUL, and LTM-TCL-Info. Among them, the candidate cell's physical layer identifier (Candidate physical cell identity, CandidatePCI) is used to uniquely identify the target cell; the candidate cell's synchronization signal block configuration parameter (Synchronization Signal BlockConfiguration, SSB-Config) is used to help the terminal quickly synchronize with the target cell and obtain system information. The candidate cell's global resource configuration parameter set (Candidate Cell Configuration, Candidate Config) is used to ensure that the terminal pre-configures the target cell parameters before switching, thereby reducing switching delay. The early uplink synchronization configuration (EarlyUplink Synchronization Configuration, EarlyUL-SynConfig) is used to configure uplink parameters in advance before the switching command is issued, thereby shortening the switching interruption time (HO Interruption). Early Uplink Synchronization Configuration for SUL (EarlyUL-SynConfigSUL) is used to enhance uplink coverage (such as for edge users) or in scenarios with high capacity requirements. Transmission Configuration Layer Information (TCL-Info) is used to transmit configuration layer information related to beam management and QoS assurance.

[0081] In the first possible implementation, the source cell uses the cell parameters of the LTM candidate cell to explicitly indicate the primary and secondary types of the cell. Figure 5 An enumeration type variable can be added to the cell parameters in (b) in the example. When the variable exists, it indicates that the cell corresponding to the group of parameters is a primary cell (PCell) type. When the variable does not exist, it indicates that the cell corresponding to the group of cell parameters is a secondary cell (SCell) type. For example, in Figure 5Add a bit to the cell parameter in (b), when the value of this bit is 1, it indicates PCell, when it is 0, it indicates SCell, or when the value of this bit is 0, it indicates PCell, when it is 1, it indicates SCell. Or, Figure 5 A cell parameter in (b) can be reused to indicate the primary or secondary type of the cell. For example, LTM-CandidatePCI can be used to indicate PCell / SCell. Alternatively, other parameters besides cell parameters, such as cell global identity (CGI), can be used to indicate PCell / SCell.

[0082] In the second possible implementation, the protocol can stipulate the primary and secondary types of LTM candidate cells. For example, the protocol stipulates that the cell corresponding to the first group of cell parameters (subscript 1) is PCell, and the cells corresponding to the remaining groups of cell parameters are SCell; for another example, the protocol stipulates that the cell corresponding to the last group of cell parameters is PCell, and the cells corresponding to the remaining groups of cell parameters are SCell; for another example, the protocol stipulates that if a group of cell parameters contains LTE-EarlyUL-SynConfig, it means that the cell corresponding to this group of cell parameters is PCell, and if it does not contain it, it means that the cell corresponding to this group of cell parameters is SCell. In this case, the base station ensures that among multiple groups of cell parameters, only one cell's cell parameters contain LTE-EarlyUL-SynConfig.

[0083] In another possible implementation, the source cell may indicate the primary and secondary types of the LTM candidate cells in the MAC CE in the LTM handover process, or in other words, the MAC CE indicates which cell is the PCell and which cell is the SCell. Alternatively, the MAC CE may only indicate which cell is the PCell, so that the remaining cells are SCells. Alternatively, the MAC CE may indicate whether the type of each cell in the LTM candidate cells is the PCell or the SCell, for example, using a bitmap in the MAC CE, where 1 indicates the PCell and 0 indicates the SCell. For example, this may be used Figure 6 Add a new field Cell index in , or use Figure 6 The reserved field of the ellipse mark indicates which cell is the PCell and which cell is the SCell. It is worth noting that the bit of the ellipse mark is just one example, and the present application can also use other reserved bits to indicate the primary and secondary cell types.

[0084] In other possible implementations, after the first node switches to the target cell through the LTM handover process, the target cell sends a notification message to the first node, where the notification message indicates the cell type among the LTM candidate cells. For example, after a successful LTM handover, the UE monitors the PDCCH in multiple candidate cells indicated by the LTM candidate cell identifier (LTM-Candidate ID). The base station sends the notification message to the UE via one of the multiple cells to inform the UE which cell is the PCell.

[0085] For another example, after receiving the LTM, the UE monitors the PDCCH in multiple cells indicated by the LTM candidate cell identifier (LTM-Candidate ID). If the UE monitors the indication in the kth cell earliest, the UE considers the kth cell monitored earliest to be the PCell. In other words, if the UE first monitors DCI in the k-th cell, it considers the k-th cell to be the PCell; or, if the UE first monitors downlink data indicated by PDCCH DCI in the k-th cell, it considers the k-th cell to be the PCell; or, if the UE first monitors uplink resource allocation indicated by DCI in the k-th cell, it considers the k-th cell to be the PCell; or, if the UE first monitors downlink data or uplink resource allocation indicated by PDCCH DCI in the k-th cell, it considers the k-th cell to be the PCell; or, if the UE first monitors a specific MACCE in the k-th cell, such as a MAC CE notifying that the k-th cell is the Pcell, it considers the k-th cell to be the PCell; or, if the UE first monitors a specific RRC message in the k-th cell, such as an RRC message notifying that the k-th cell is the Pcell, it considers the k-th cell to be the PCell, where 1≤k≤N, and N is the total number of candidate cells.

[0086] In this embodiment, the base station may send the notification message in the form of DCI, MAC CE, or RRC message, and this application does not impose any restrictions on this.

[0087] In a possible embodiment, after the source cell completes configuring the LTM candidate target cell, it further sends a first message to the first node. The first indication information in the first message is used to instruct the first node to send a random access signal in a k-th candidate cell of at least two candidate cells, where k is a positive integer. The random access information is used to determine the timing advance (TA) of the first cell and the second cell. For example, the base station sends a PDCCH order to the UE, where the PDCCH order is used to notify the UE to send a random access code (preamble) to the first cell to obtain a timing advance (TA) in advance.

[0088] For example, in the early synchronization phase of the LTM process, after the base station completes the configuration of the LTM candidate target cells, it can instruct the UE to send a preamble in the kth (1≤k≤N) candidate cell through the indication information in the PDCCHorder. Exemplarily, the indication information in the PDCCHorder is used to instruct the UE to send a preamble in the first candidate cell, or to instruct the UE to send a preamble in the Nth candidate cell. It should be understood that the indication information in the PDCCH order can also instruct the UE to send a preamble in a middle cell among at least two candidate cells, or, the kth candidate cell is a cell among the at least two candidate cells that is configured with a physical random access channel (PRACH) resource, and the indication information in the PDCCH order sends a preamble in a candidate cell that is configured with PRACH resources.

[0089] The traditional PDCCH order usually directly indicates the UE Figure 5 The cell corresponding to the cell parameters shown in (a) initiates random access. Figure 5 As shown in (b) of FIG, because a single LTM candidate cell identifier (LTM-Candidate ID) corresponds to multiple sets of cell parameters, that is, when corresponding to multiple cells, the traditional indication method in the PDCCH order cannot clearly indicate in which cell the UE sends the preamble. Therefore, in this embodiment, at least one of the following methods can be used to indicate in which cell the first node sends the preamble:

[0090] Method 1: The first node sends a preamble through the first cell among the LTM candidate target cells.

[0091] In the second method, the first node sends a preamble through the last cell among the LTM candidate target cells.

[0092] Method three: adding indication information to the PDCCH order or other messages, where the indication information is used to notify the first node to send the preamble through the kth cell in the candidate configuration.

[0093] Method 4: When the RRC message configures that the kth cell is a PCell, the PDCCH order does not need to be changed, and the UE directly sends the preamble in the kth cell.

[0094] In a possible embodiment, the first information may be carried in a cell handover command sent by the source cell to the UE, such as Figure 1The first node identifies the PCell and the SCell from the first information, and transmits data through the PCell and the SCell simultaneously after the LTM handover is successful.

[0095] For example, Figure 7 As shown in (a) of FIG, in the traditional LTM switching process, the UE switches from the primary and secondary cells (PCell1 and SCell1) to cell 2 (Cell2), while in this embodiment, as shown in FIG. Figure 7 As shown in (b) of the figure, by configuring the configuration information of at least two cells, during LTM handover, the UE switches from the primary and secondary cells (PCell1 and SCell1) to PCell2, and transmits data via PCell2 and SCell2 carrier aggregation. In comparison, the handover method provided in this embodiment can achieve high data rate transmission, thereby reducing the "low data rate window" caused by LTM, achieving stable data rates and improving user experience.

[0096] For example, Figure 8 As shown in (a) in FIG, the source cell can configure configuration information of at least two candidate cell groups for the UE, so that during LTM switching, the UE switches from the serving cell group to the candidate cell group 2 and transmits data through the PCell and SCell in the candidate cell group 2, as shown in FIG. Figure 8 It is worth noting that if the candidate cell group 1 contains only one cell, the UE does not use CA transmission after LTM, as shown in (b). Figure 8 As shown in (c) in .

[0097] In a possible embodiment, the source cell may also notify the TA to the first node if the source cell Figure 1 In step S145, the MAC CE notifies the TA (i.e., the TA field indicated in the MAC CE is a valid value). The UE can monitor the PDCCH in both the PCell and the SCell (if the base station configures the UE to monitor the PDCCH in the SCell). In this scenario, the base station is considered to have configured CA. Optionally, when at least two cells are notified of the TA by the MAC CE, and the TA is a valid value, the primary cell of the at least two cells can be determined according to the order of the LTM candidate cells configured in the RRC message. For example, if both cell 1 and cell 2 are notified of a valid TA value, cell 1 is determined to be the PCell because cell 1 ranks higher in the LTM candidate cell order configured in the RRC message.

[0098] On the contrary, if the source cell does not notify the first node of the TA (for example, the TA field indicated in the MAC CE is an invalid value), the first node needs to initiate random access to obtain the TA. Taking the first node as a UE as an example, the UE selects which cell to initiate random access in as follows:

[0099] Method A: If the UE identifies the PCell and SCell through the configuration message when configuring the candidate cell, and the source cell does not Figure 1 If the MAC CE in step S145 notifies the TA (ie, the TA field indicated in the MAC CE is an invalid value), the UE initiates random access through the PCell to obtain the TA value.

[0100] Method B: If the UE identifies the PCell and SCell when configuring the candidate cell, and the source cell does not Figure 1 If the MAC CE in step S145 notifies the TA (ie, the TA field indicated in the MAC CE is an invalid value), the UE initiates random access through the first or last cell in the configuration and obtains the TA value.

[0101] Method C: If the UE identifies the PCell and SCell through the configuration message when configuring the candidate cell, and the source cell does not Figure 1 If the MAC CE in step S145 notifies the TA (i.e., the TA field indicated in the MAC CE is an invalid value), the UE initiates random access through the SCell to obtain the TA value. If multiple SCells are configured, random access is initiated through the first or last SCell.

[0102] Mode D: If the UE identifies the PCell and SCell through the configuration message when configuring the candidate cell, and the base station does not Figure 1 If the MAC CE in step S145 notifies the TA (ie, the TA field indicated in the MAC CE is an invalid value), the UE initiates random access through any cell in the configuration to obtain the TA value.

[0103] Method E: If the UE identifies the PCell and SCell through the configuration message when configuring the candidate cell, and the base station does not Figure 1 If the MAC CE in step S145 notifies the TA (i.e., the TA field indicated in the MAC CE is an invalid value), the base station notifies the UE in which cell to initiate random access in addition to the LTM command. The base station can notify the UE "in which cell to initiate random access" through another MAC CE, or add a field in the LTM command to notify the UE in which cell to initiate random access. For example, using Figure 6The one or more reserved bits R in the last row indicate in which cell the UE initiates random access. The specific bits used may be specified by the protocol, such as Figure 6 As shown in the middle ellipse, here we only need to indicate the cell in Figure 5 Alternatively, a field cell index (Cell index) can be added to the LTM to indicate which cell the UE initiates random access, such as Figure 6 shown.

[0104] Mode F: When the kth cell in a group of candidate cells is configured with PRACH resources, random access is initiated through the kth cell to obtain a TA value, where k is a positive integer.

[0105] Method G can also be used Figure 6 Some specific values ​​of the Timing Advance Command in the protocol inform the UE in which cell to initiate random access. For example, in the existing protocol, the TA value of 0XFFF indicates an invalid value, and if it is other values, it indicates a valid TA value. In fact, there are several other values ​​that also exceed the current cell radius requirements, so these values ​​can be used to indicate to the UE "which cell to initiate random access". For example, 0XFFE means in Figure 5 The first cell in the cell list shown in (b) initiates random access, and 0XFFD indicates that Figure 5 The second cell in the cell list shown in (b) initiates random access.

[0106] In a possible embodiment, the source cell may send a first LTM cell handover command and a second LTM cell handover command to the first node in sequence, where the first LTM cell handover command is used to notify the first node to switch to the first candidate cell, and the second LTM cell handover command is used to notify the first node to switch to the second candidate cell. After receiving the first LTM cell handover command and the second LTM cell handover command, the first node determines the primary and secondary cell types and uses the first candidate cell and the second candidate cell for transmission. It can be seen that this embodiment does not change the LTM cell handover command and RRC message format. Instead, the source cell sends two LTM cell handover commands to the first node, allowing the UE to obtain the configuration information of the two cells, thereby performing carrier aggregation.

[0107] In a possible embodiment, the first node determines the PCell and SCell according to two LTM handover commands. There may be the following two situations:

[0108] In scenario 1, the MAC CE indicating the first candidate cell and the MAC CE indicating the second candidate cell are transmitted through the same TB. After the UE decodes the TB, it can know the order of the first candidate cell and the second candidate cell. The UE determines that the cell corresponding to the first LTM cell switching command in the TB is the PCell, or the UE determines that the cell corresponding to the last LTM cell switching command in the TB is the PCell.

[0109] In scenario 2, the MAC CE indicating the first candidate cell and the MAC CE indicating the second candidate cell are transmitted via different TBs. The UE determines that the cell corresponding to the first successfully received LTM cell handover command is the PCell. Since the UE sends an ACK / NACK signal to the base station after receiving the LTM cell handover command, the base station and the UE have the same cell type identification.

[0110] It should be understood that in other possible embodiments, the base station may also send an additional notification message to indicate that the first candidate cell and the second candidate cell are PCell and SCell respectively. The notification message may be a MAC CE or a DCI.

[0111] For example, in the LTM preparation phase, the source cell configures five LTM candidate cells for the UE: ABCDE. Figure 1 compared to, Figure 9 The improvement in the LTM cell handover execution phase is that if the source cell receives the measurement report sent by the UE, determines to configure the handover target cell for the UE, and configures CA at the same time, then in the LTM cell handover execution phase, when the source cell sends the LTM handover command to the UE ( Figure 1 In step S145), another LTM cell handover command is sent to notify candidate cell B and candidate cell D. After receiving the two LTM cell handover commands, the UE considers the candidate cell B in the notification message received first as the PCell and the candidate cell D as the Scell.

[0112] It is worth noting that Figure 9 In the example shown, the source cell instructs two cells to perform CA, such as cell B and cell D. The source cell may also instruct three or more cells to perform CA. In this case, the method for instructing PCell is the same as described above.

[0113] In the above embodiment, for the distributed base station application scenario, the CU where the source cell is located notifies the DU where the source cell is located of "which cell combinations can be CA and which cell combinations cannot be CA", so that the source cell can determine "which cell combinations can be CA and which cell combinations cannot be CA"; then the DU where the source cell is located sends a MAC CE notification to the UE to determine the primary and secondary cells.

[0114] In a possible embodiment, after LTM switching, the UE default SCell is in an activated state; or after LTM switching, the first SCell in the UE default RRC configuration is in an activated state; or after LTM switching, the kth SCell in the UE default RRC configuration is in an activated state; or after LTM switching, all SCells in the UE default RRC configuration are in an activated state.

[0115] In a possible embodiment, the LTM switching command instructs the UE that "after LTM switching, the kth SCell is in an activated state / deactivated state"; or the LTM switching command instructs the UE that "after LTM switching, the kth SCell is in an activated state / deactivated state"; or the LTM switching command instructs the UE that "after LTM switching, all SCells are in an activated state / deactivated state".

[0116] In a possible embodiment, the RRC message configures the UE that "after LTM switching, the kth SCell is in an activated state / deactivated state"; or the RRC message configures the UE that "after LTM switching, the kth SCell is in an activated state / deactivated state"; or the RRC message configures the UE that "after LTM switching, all SCells are in an activated state / deactivated state".

[0117] Using the above embodiment to perform cell switching, on the one hand, there is no need to change the protocol, that is, there is no need to change the configuration information of the candidate cell, that is, the Figure 5 The data structure shown in (a) above does not require changes to the LTM MAC CE structure. Furthermore, the base station can notify multiple candidate cells and flexibly combine these multiple candidate cells, eliminating the need to notify multiple combinations of multiple cells in the RRC configuration message, thereby reducing the size of the RRC configuration message. As can be seen, the above embodiment optimizes the L1 / L2 handover process. Because CA is configured during the LTM handover process, the UE can immediately use CA after entering the target cell through the LTM handover process, thereby improving data transmission rates and reducing the low data rate window caused by handover.

[0118] Combined with the above Figures 1 to 9 , describes the method embodiment of the present application in detail, and the following is combined with Figures 10 to 13 , the device embodiment of the present application is described in detail. It should be understood that the description of the method embodiment corresponds to the description of the device embodiment, so for parts not described in detail, reference can be made to the previous method embodiment.

[0119] Figure 10 This is a schematic block diagram of a first node 1000 provided in an embodiment of the present application. Figure 10 The first node 1000 shown can be any terminal device or network device described above. Figure 10The first node 1000 shown may include a first transceiver module 1010 and a first processing module 1020 .

[0120] The first transceiver module 1010 is configured to receive first information; wherein the first information includes configuration information of at least two candidate cells for carrier aggregation, the configuration information including primary and secondary types of the first cell and the second cell;

[0121] The first processing module 1020 is used to perform carrier aggregation communication on at least the first cell and the second cell when the first node switches to the first cell based on layer 1 / layer 2, wherein the first cell is used as the primary cell for carrier aggregation and the second cell is used as the secondary cell for carrier aggregation.

[0122] In a possible embodiment, the first information is carried in an RRC message or a MAC CE message in a layer 1 / layer 2 handover process.

[0123] In a possible embodiment, the primary and secondary types of the first cell and the second cell are indicated by any one of the following methods:

[0124] Indicating the primary and secondary types of the first cell and the second cell by using a cell parameter in an RRC message structure;

[0125] A primary and secondary type of the first cell and the second cell is agreed upon through a protocol;

[0126] The primary and secondary types of the first cell and the second cell are indicated through a MAC CE message.

[0127] In a possible embodiment, the manner in which the first processing module 1020 agrees on the primary and secondary types of the first cell and the second cell through a protocol includes at least one of the following:

[0128] It is agreed that the cell corresponding to the first group of cell parameters bound to the LTM candidate cell identifier is the primary cell, and the cells corresponding to the remaining groups of cell parameters are secondary cells;

[0129] It is agreed that the cell corresponding to the last set of cell parameters bound to the LTM candidate cell identifier is the primary cell, and the cells corresponding to the remaining sets of cell parameters are secondary cells;

[0130] It is agreed that when a group of cell parameters bound to the LTM candidate cell identifier includes parameters related to uplink early synchronization configuration, the cell corresponding to the cell parameters is a primary cell; otherwise, the cell corresponding to the cell parameters is a secondary cell.

[0131] In a possible embodiment, the first transceiver module 1010 is further used to receive a first message, where the first message is used to request the first node to perform early synchronization for the carrier aggregation, where the early synchronization includes early uplink synchronization and / or early downlink synchronization.

[0132] In a possible embodiment, the first indication information in the first message is used to instruct the first node to send a random access signal in a kth candidate cell of at least two candidate cells, where k is a positive integer, and the random access information is used to determine the timing advance TA of the first cell and the second cell.

[0133] In a possible embodiment, the first transceiver module 1010 is further configured to: receive a handover command message, where the handover command message is used to instruct the first node to handover to the first cell.

[0134] In a possible embodiment, the kth candidate cell satisfies any one of the following conditions:

[0135] The kth candidate cell is the first cell among the at least two candidate cells;

[0136] The kth candidate cell is the last cell among the at least two candidate cells;

[0137] The kth candidate cell is a middle cell among the at least two candidate cells;

[0138] The kth candidate cell is a cell among the at least two candidate cells configured with physical random access channel PRACH resources.

[0139] In a possible embodiment, the advance synchronization method includes uplink and downlink synchronization based on configuration information of the candidate cell or a random access method; when the TA is not obtained through the switching command message, the first processing module 1020 obtains the TA by initiating random access.

[0140] In a possible embodiment, the first processing module 1020 acquires the TA by initiating random access in at least one of the following ways:

[0141] Initiate random access through the primary cell to obtain the TA value;

[0142] Initiate random access through the first or last candidate cell in the configuration information to obtain the TA value;

[0143] Initiate random access through the secondary cell to obtain the TA value;

[0144] If the configuration information configures multiple secondary cells, random access is initiated through the first or last secondary cell to obtain the TA value;

[0145] Initiate random access through any cell configured in the configuration information to obtain the TA value;

[0146] Initiate random access through the target cell indicated by the timing advance command to obtain the TA value;

[0147] When the kth cell in a group of candidate cells is configured with PRACH resources, random access is initiated through the kth cell to obtain a TA value.

[0148] In a possible embodiment, the first transceiver module 1010 is used to receive a first switching command message and a second switching command message, the first switching command message is used to notify the first node to switch to the first cell, and the second switching command message is used to notify the first node to switch to the second cell; the first processing module 1020 is used to perform carrier aggregation communication on at least the first cell and the second cell when the first node switches to the first cell based on layer 1 / layer 2, wherein the first cell is used as the primary cell for carrier aggregation and the second cell is used as the secondary cell for carrier aggregation.

[0149] In a possible embodiment, the first processing module 1020 is further configured to: determine the primary and secondary cell types according to the first handover command message and the second handover command message.

[0150] In a possible embodiment, the first processing module 1020 determines the primary and secondary cell types according to the first handover command message and the second handover command message, including:

[0151] When the first handover command message and the second handover command message are transmitted through the same TB, determining the primary and secondary cell types according to the order of the first handover command message and the second handover command message in the TB;

[0152] or, when the first handover command message and the second handover command message are transmitted through different TBs, the primary and secondary cell types are determined according to the order in which the handover command messages are received;

[0153] Alternatively, the primary and secondary cell types are determined according to a received notification message, where the notification message indicates the primary and secondary cell types of the first candidate cell and the second candidate cell.

[0154] In an optional embodiment, the first transceiver module 1010 may be Figure 12 The transceiver 1230 in the first processing module 1020 can be Figure 10 The first node 1000 may further include a memory 1220, specifically as follows Figure 12 shown.

[0155] Figure 11 This is a schematic block diagram of a second node 1100 provided in an embodiment of the present application. Figure 11 The second node 1100 shown may be any terminal device described above. Figure 11 The second node 1100 shown may include a second transceiver module 1110 .

[0156] In a possible embodiment, the first transceiver module 1110 is used to send first information; wherein, the first information includes configuration information of at least two candidate cells for carrier aggregation, and the configuration information includes the primary and secondary types of the first cell and the second cell; the first information is used to indicate that when the first node switches to the first cell based on layer 1 / layer 2, carrier aggregation communication is performed at least on the first cell and the second cell, wherein the first cell is used as the primary cell for carrier aggregation, and the second cell is used as the secondary cell for carrier aggregation.

[0157] In a possible embodiment, the first information is carried in an RRC message or a MAC CE message in a layer 1 / layer 2 handover process.

[0158] In a possible embodiment, the primary and secondary types of the first cell and the second cell are indicated by any one of the following methods:

[0159] Indicating the primary and secondary types of the first cell and the second cell by using a cell parameter in an RRC message structure;

[0160] A primary and secondary type of the first cell and the second cell is agreed upon through a protocol;

[0161] The primary and secondary types of the first cell and the second cell are indicated through a MAC CE message.

[0162] In a possible embodiment, a manner of agreeing on the primary and secondary types of the first cell and the second cell through a protocol includes at least one of the following:

[0163] It is agreed that the cell corresponding to the first group of cell parameters bound to the LTM candidate cell identifier is the primary cell, and the cells corresponding to the remaining groups of cell parameters are secondary cells;

[0164] It is agreed that the cell corresponding to the last set of cell parameters bound to the LTM candidate cell identifier is the primary cell, and the cells corresponding to the remaining sets of cell parameters are secondary cells;

[0165] It is agreed that when a group of cell parameters bound to the LTM candidate cell identifier includes parameters related to uplink early synchronization configuration, the cell corresponding to the cell parameters is a primary cell; otherwise, the cell corresponding to the cell parameters is a secondary cell.

[0166] In a possible embodiment, the second transceiver module 1110 is used to receive a first message, where the first message is used to request the first node to perform early synchronization for the carrier aggregation, where the early synchronization includes early uplink synchronization and / or early downlink synchronization.

[0167] In a possible embodiment, the first indication information in the first message is used to instruct the first node to send a random access signal in a kth candidate cell of at least two candidate cells, where k is a positive integer, and the random access information is used to determine the timing advance TA of the first cell and the second cell.

[0168] In a possible embodiment, the second transceiver module 1110 is further configured to receive a handover command message, where the handover command message is used to instruct the first node to handover to the first cell.

[0169] In a possible embodiment, the kth candidate cell satisfies any one of the following conditions:

[0170] The kth candidate cell is the first cell among the at least two candidate cells;

[0171] The kth candidate cell is the last cell among the at least two candidate cells;

[0172] The kth candidate cell is a middle cell among the at least two candidate cells;

[0173] The kth candidate cell is a cell among the at least two candidate cells configured with physical random access channel PRACH resources.

[0174] In a possible embodiment, the advance synchronization method includes uplink and downlink synchronization based on configuration information of the candidate cell or a random access method; when the TA is not obtained through the switching command message, the second transceiver module 1110 obtains the TA by initiating random access.

[0175] In a possible embodiment, a manner of acquiring a TA by initiating random access includes at least one of the following:

[0176] Initiate random access through the primary cell to obtain the TA value;

[0177] Initiate random access through the first or last candidate cell in the configuration information to obtain the TA value;

[0178] Initiate random access through the secondary cell to obtain the TA value;

[0179] If the configuration information configures multiple secondary cells, random access is initiated through the first or last secondary cell to obtain the TA value;

[0180] Initiate random access through any cell configured in the configuration information to obtain the TA value;

[0181] Initiate random access through the target cell indicated by the timing advance command to obtain the TA value;

[0182] When the kth cell in a group of candidate cells is configured with PRACH resources, random access is initiated through the kth cell to obtain a TA value.

[0183] In a possible embodiment, the second transceiver module is used to send a first switching command message and a second switching command message, the first switching command message is used to notify the first node to switch to the first cell, and the second switching command message is used to notify the first node to switch to the second cell; the first switching command message and the second switching command message are used to indicate that when the first node switches to the first cell based on layer 1 / layer 2, carrier aggregation communication is performed at least on the first cell and the second cell, wherein the first cell is used as the primary cell for carrier aggregation, and the second cell is used as the secondary cell for carrier aggregation.

[0184] In a possible embodiment, the first handover command message and the second handover command message are used to determine the primary and secondary cell types.

[0185] In a possible embodiment, the first handover command message and the second handover command message are used to determine the primary and secondary cell types, including:

[0186] When the first handover command message and the second handover command message are transmitted through the same TB, the primary and secondary cell types are determined according to the order of the first handover command message and the second handover command message in the TB;

[0187] or, when the first handover command message and the second handover command message are transmitted through different TBs, the primary and secondary cell types are determined according to the order in which the handover command messages are received;

[0188] Alternatively, the primary and secondary cell types are determined according to a received notification message, where the notification message indicates the primary and secondary cell types of the first candidate cell and the second candidate cell.

[0189] In an optional embodiment, the second transceiver module 1110 may be Figure 12The transceiver 1230 in the second node 1100 may further include a memory 1220 and a processor 1210, as shown in FIG. Figure 12 shown.

[0190] Figure 12 It is a schematic structural diagram of a communication device according to an embodiment of the present application. Figure 12 The dotted line in the figure indicates that the unit or module is optional. The apparatus 1200 can be used to implement the method described in the above method embodiment. The apparatus 1200 can be a chip, a user equipment or a network device.

[0191] The device 1200 may include one or more processors 1210. The processor 1210 may support the device 1200 to implement the method described in the above method embodiment. The processor 1210 may be a general-purpose processor or a special-purpose processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may be another general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, etc. The general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0192] The apparatus 1200 may further include one or more memories 1220. The memories 1220 store programs that can be executed by the processor 1210, causing the processor 1210 to perform the methods described in the above method embodiments. The memories 1220 may be independent of the processor 1210 or integrated into the processor 1210.

[0193] The apparatus 1200 may further include a transceiver 1230. The processor 1210 may communicate with other devices or chips via the transceiver 1230. For example, the processor 1210 may transmit and receive data with other devices or chips via the transceiver 1230.

[0194] Figure 13 The hardware module diagram of the communication device provided in the embodiment of the present application. Specifically, Figure 13 A block diagram is shown of a first communication device 1350 and a second communication device 1310 communicating with each other in an access network.

[0195] The first communication device 1350 includes a controller / processor 1359, a memory 1360, a data source 1367, a transmit processor 1368, a receive processor 1356, a multi-antenna transmit processor 1357, a multi-antenna receive processor 1358, a transmitter / receiver 1354 and an antenna 1352.

[0196] The second communication device 1310 includes a controller / processor 1375, a memory 1376, a data source 1377, a receive processor 1370, a transmit processor 1316, a multi-antenna receive processor 1372, a multi-antenna transmit processor 1371, a transmitter / receiver 1318 and an antenna 1320.

[0197] During transmission from the second communications device 1310 to the first communications device 1350, at the second communications device 1310, upper layer data packets from the core network or from a data source 1377 are provided to a controller / processor 1375. The core network and data source 1377 represent all protocol layers above the L2 layer. The controller / processor 1375 implements L2 layer functionality. During transmission from the second communications device 1310 to the first communications device 1350, the controller / processor 1375 provides header compression, encryption, packet segmentation and reordering, multiplexing between logical and transport channels, and radio resource allocation to the first communications device 1350 based on various priority metrics. The controller / processor 1375 is also responsible for retransmission of lost packets and signaling to the first communications device 1350. The transmit processor 1316 and the multi-antenna transmit processor 1371 implement various signal processing functions for the L1 layer (i.e., the physical layer). The transmit processor 1316 implements coding and interleaving to facilitate forward error correction at the second communication device 1310, as well as mapping of signal constellations based on various modulation schemes (e.g., binary phase shift keying, quadrature phase shift keying, M-phase shift keying, and M-quadrature amplitude modulation). The multi-antenna transmit processor 1371 performs digital spatial precoding, including codebook-based and non-codebook-based precoding, and beamforming on the coded and modulated symbols to generate one or more spatial streams. The transmit processor 1316 then maps each spatial stream to a subcarrier, multiplexes it with a reference signal (e.g., a pilot) in the time and / or frequency domain, and then uses an inverse fast Fourier transform to generate a physical channel carrying the time-domain multicarrier symbol stream. The multi-antenna transmit processor 1371 then performs transmit analog precoding / beamforming operations on the time-domain multicarrier symbol stream. Each transmitter 1318 converts the baseband multi-carrier symbol stream provided by the multi-antenna transmit processor 1371 into a radio frequency stream, and then provides it to a different antenna 1320.

[0198] During transmission from the second communications device 1310 to the first communications device 1350, at the first communications device 1350, each receiver 1354 receives a signal via its corresponding antenna 1352. Each receiver 1354 recovers the information modulated onto the RF carrier and converts the RF stream into a baseband multi-carrier symbol stream, which is provided to the receive processor 1356. The receive processor 1356 and the multi-antenna receive processor 1358 implement various L1 layer signal processing functions. The multi-antenna receive processor 1358 performs receive analog precoding / beamforming operations on the baseband multi-carrier symbol stream from the receiver 1354. The receive processor 1356 uses a fast Fourier transform to convert the baseband multi-carrier symbol stream, after the receive analog precoding / beamforming operations, from the time domain to the frequency domain. In the frequency domain, the receive processor 1356 demultiplexes the physical layer data signal and reference signal, where the reference signal is used for channel estimation. The data signal undergoes multi-antenna detection in the multi-antenna receive processor 1358 to recover any spatial streams destined for the first communications device 1350. The symbols on each spatial stream are demodulated and recovered in the receive processor 1356, and soft decisions are generated. The receive processor 1356 then decodes and deinterleaves the soft decisions to recover the upper layer data and control signals transmitted by the second communication device 1310 on the physical channel. The upper layer data and control signals are then provided to the controller / processor 1359. The controller / processor 1359 implements the functions of the L2 layer. The controller / processor 1359 may be associated with a memory 1360 that stores program codes and data. The memory 1360 may be referred to as a computer-readable medium. During transmission from the second communication device 1310 to the first communication device 1350, the controller / processor 1359 provides demultiplexing between transport and logical channels, packet reassembly, decryption, header decompression, and control signal processing to recover the upper layer data packets from the second communication device 1310. The upper layer data packets are then provided to all protocol layers above the L2 layer. Various control signals may also be provided to the L3 layer for L3 processing.

[0199] During transmission from the first communications device 1350 to the second communications device 1310, upper layer data packets are provided to the controller / processor 1359 at the first communications device 1350 using a data source 1367. Data source 1367 represents all protocol layers above the L2 layer. Similar to the transmission functionality at the second communications device 1310 described in the transmission from the second communications device 1310 to the first communications device 1350, the controller / processor 1359 implements header compression, encryption, packet segmentation and reordering, and multiplexing between logical and transport channels, implementing L2 layer functions for both the user plane and the control plane. The controller / processor 1359 is also responsible for retransmission of lost packets and signaling to the second communications device 1310. The transmit processor 1368 performs modulation mapping and channel coding, while the multi-antenna transmit processor 1357 performs digital multi-antenna spatial precoding, including codebook-based and non-codebook-based precoding, and beamforming. The transmit processor 1368 then modulates the resulting spatial stream into a multi-carrier / single-carrier symbol stream. After analog precoding and beamforming operations in the multi-antenna transmit processor 1357, the stream is provided to different antennas 1352 via the transmitter 1354. Each transmitter 1354 first converts the baseband symbol stream provided by the multi-antenna transmit processor 1357 into a RF symbol stream before providing it to the antenna 1352.

[0200] In a transmission from the first communication device 1350 to the second communication device 1310, the functionality at the second communication device 1310 is similar to the reception functionality at the first communication device 1350 described for the transmission from the second communication device 1310 to the first communication device 1350. Each receiver 1318 receives a radio frequency signal via its corresponding antenna 1320, converts the received radio frequency signal into a baseband signal, and provides the baseband signal to a multi-antenna receive processor 1372 and a receive processor 1370. The receive processor 1370 and the multi-antenna receive processor 1372 collectively implement the L1 layer functionality. The controller / processor 1375 implements the L2 layer functionality. The controller / processor 1375 may be associated with a memory 1376 that stores program codes and data. The memory 1376 may be referred to as a computer-readable medium. During transmission from the first communications device 1350 to the second communications device 1310, the controller / processor 1375 provides demultiplexing between transport and logical channels, packet reassembly, decryption, header decompression, and control signal processing to recover upper layer data packets from the first communications device 1350. The upper layer data packets from the controller / processor 1375 may be provided to the core network or all protocol layers above the L2 layer, and various control signals may also be provided to the core network or L3 for L3 processing.

[0201] As an embodiment, the first communication device 1350 includes: at least one processor and at least one memory, the at least one memory including computer program code; the at least one memory and the computer program code are configured to be used together with the at least one processor.

[0202] As an embodiment, the first communication device 1350 apparatus includes: a memory storing a computer-readable instruction program, wherein the computer-readable instruction program generates an action when executed by at least one processor.

[0203] As an embodiment, the first communication device 1350 corresponds to the first node in this application.

[0204] As an embodiment, the second communication device 1310 corresponds to the second node in this application.

[0205] As an embodiment, the first communication device 1350 is a user equipment, which can serve as a relay node.

[0206] As an embodiment, the first communication device 1350 is a Network Control Relay (NCR).

[0207] As an embodiment, the first communication device 1350 is a relay wireless repeater.

[0208] As an embodiment, the first communication device 1350 is a relay.

[0209] As an embodiment, the second communication device 1310 is a location management function (LMF).

[0210] As an embodiment, the first communication device 1350 corresponds to the first node in this application, and the controller / processor 1359 is used to execute the above method.

[0211] The present application also provides a computer-readable storage medium for storing a program. The computer-readable storage medium can be applied to a terminal or network device provided in the present application, and the program enables a computer to execute the methods performed by the terminal device, network device, or core network entity in various embodiments of the present application.

[0212] The present application also provides a computer program product. The computer program product includes a program. The computer program product can be applied to a terminal or network device provided in the present application, and the program causes a computer to execute the methods performed by the terminal device, network device, or core network entity in various embodiments of the present application.

[0213] The present application also provides a computer program that can be applied to a terminal or network device provided in the present application, and enables a computer to execute the methods performed by the terminal device, network device, or core network entity in various embodiments of the present application.

[0214] It should be understood that the terms "system" and "network" in this application can be used interchangeably. In addition, the terms used in this application are only used to explain the specific embodiments of this application and are not intended to limit this application. The terms "first", "second", "third", and "fourth" in the specification and claims of this application and the accompanying drawings are used to distinguish different objects rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0215] In the embodiments of this application, the term "indication" may refer to a direct indication, an indirect indication, or an indication of an association. For example, "A indicates B" may refer to a direct indication of B, e.g., B can obtain information through A; it may refer to an indirect indication of B, e.g., A indicates C, e.g., B can obtain information through C; or it may refer to an association between A and B.

[0216] In the embodiment of the present application, "B corresponding to A" means that B is associated with A and B can be determined based on A. However, it should be understood that determining B based on A does not mean determining B based solely on A, but B can also be determined based on A and / or other information.

[0217] In the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between the two, or an association relationship between the two, or a relationship between indication and indication, configuration and configuration, etc.

[0218] In the embodiments of the present application, "pre-defined" or "pre-configured" may be implemented by pre-storing corresponding codes, tables, or other methods that can be used to indicate relevant information in a device (e.g., including a user device and a network device). The present application does not limit the specific implementation method. For example, pre-defined may refer to information defined in a protocol.

[0219] In the embodiments of the present application, the “protocol” may refer to a standard protocol in the communications field, for example, it may include an LTE protocol, an NR protocol, and related protocols used in future communication systems, and the present application does not limit this.

[0220] In the embodiments of this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0221] In various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0222] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0223] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0224] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0225] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer 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 transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be read by a computer or a data storage device such as a server or data center that includes one or more available media integrated therein. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital versatile disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0226] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A method in a first node for wireless communication, characterized in that include: Receive first information; wherein the first information includes configuration information of at least two candidate cells for carrier aggregation, the configuration information including primary and secondary types of the first cell and the second cell; When the first node switches to the first cell based on layer 1 / layer 2, carrier aggregation communication is performed on at least the first cell and the second cell, wherein the first cell is used as a primary cell for carrier aggregation and the second cell is used as a secondary cell for carrier aggregation.

2. The method according to claim 1, characterized in that The first information is carried in a radio resource control RRC message or a media access control element MAC CE message in a layer 1 / layer 2 handover process.

3. The method according to claim 1 or 2, characterized in that The primary and secondary types of the first cell and the second cell are indicated in any one of the following ways: Indicating the primary and secondary types of the first cell and the second cell by using a cell parameter in an RRC message structure; A primary and secondary type of the first cell and the second cell is agreed upon through a protocol; The primary and secondary types of the first cell and the second cell are indicated through a MAC CE message.

4. The method according to claim 3, characterized in that The manner of agreeing on the primary and secondary types of the first and second cells through a protocol includes at least one of the following: It is agreed that the cell corresponding to the first group of cell parameters bound to the LTM candidate cell identifier is the primary cell, and the cells corresponding to the remaining groups of cell parameters are secondary cells; It is agreed that the cell corresponding to the last set of cell parameters bound to the LTM candidate cell identifier is the primary cell, and the cells corresponding to the remaining sets of cell parameters are secondary cells; It is agreed that when a group of cell parameters bound to the LTM candidate cell identifier includes parameters related to uplink early synchronization configuration, the cell corresponding to the cell parameters is a primary cell; otherwise, the cell corresponding to the cell parameters is a secondary cell.

5. The method according to any one of claims 1 to 4, characterized in that A first message is received, where the first message is used to request the first node to perform early synchronization for the carrier aggregation, where the early synchronization includes early uplink synchronization and / or early downlink synchronization.

6. The method according to claim 5, characterized in that The first indication information in the first message is used to instruct the first node to send a random access signal in a kth candidate cell of at least two candidate cells, where k is a positive integer, and the random access information is used to determine the timing advance TA of the first cell and the second cell.

7. The method according to any one of claims 1 to 6, characterized in that Also includes: A handover command message is received, where the handover command message is used to instruct the first node to hand over to the first cell.

8. The method according to claim 6, characterized in that The kth candidate cell satisfies any of the following conditions: The kth candidate cell is the first cell among the at least two candidate cells; The kth candidate cell is the last cell among the at least two candidate cells; The kth candidate cell is a middle cell among the at least two candidate cells; The kth candidate cell is a cell among the at least two candidate cells configured with physical random access channel PRACH resources.

9. The method according to claim 5 or 6, characterized in that The early synchronization method includes uplink and downlink synchronization based on configuration information of the candidate cell or a random access method; If the TA is not obtained through the handover command message, the TA is obtained by initiating random access.

10. The method according to claim 9, characterized in that The method of acquiring the TA by initiating random access includes at least one of the following: Initiate random access through the primary cell to obtain the TA value; Initiate random access through the first or last candidate cell in the configuration information to obtain the TA value; Initiate random access through the secondary cell to obtain the TA value; If the configuration information configures multiple secondary cells, random access is initiated through the first or last secondary cell to obtain the TA value; Initiate random access through any cell configured in the configuration information to obtain the TA value; Initiate random access through the target cell indicated by the timing advance command to obtain the TA value; When the kth cell in a group of candidate cells is configured with PRACH resources, random access is initiated through the kth cell to obtain a TA value.

11. A method in a first node for wireless communication, characterized in that: include: receiving a first handover command message and a second handover command message, where the first handover command message is used to notify the first node to switch to the first cell, and the second handover command message is used to notify the first node to switch to the second cell; When the first node switches to the first cell based on layer 1 / layer 2, carrier aggregation communication is performed on at least the first cell and the second cell, wherein the first cell is used as a primary cell for carrier aggregation and the second cell is used as a secondary cell for carrier aggregation.

12. The method according to claim 11, characterized in that Also includes: The primary and secondary cell types are determined according to the first handover command message and the second handover command message.

13. The method according to claim 12, characterized in that Determining the primary and secondary cell types according to the first handover command message and the second handover command message includes: When the first handover command message and the second handover command message are transmitted through the same TB, determining the primary and secondary cell types according to the order of the first handover command message and the second handover command message in the TB; or, when the first handover command message and the second handover command message are transmitted through different TBs, the primary and secondary cell types are determined according to the order in which the handover command messages are received; Alternatively, the primary and secondary cell types are determined according to a received notification message, where the notification message indicates the primary and secondary cell types of the first candidate cell and the second candidate cell.

14. A method in a second node for wireless communication, characterized in that: include: Send first information; wherein, the first information includes configuration information of at least two candidate cells for carrier aggregation, and the configuration information includes the primary and secondary types of the first cell and the second cell; the first information is used to indicate that when the first node switches to the first cell based on layer 1 / layer 2, carrier aggregation communication is performed on at least the first cell and the second cell, wherein the first cell is used as the primary cell for carrier aggregation, and the second cell is used as the secondary cell for carrier aggregation.

15. The method according to claim 14, characterized in that The first information is carried in a radio resource control RRC message or a media access control element MAC CE message in a layer 1 / layer 2 handover process.

16. The method according to claim 14 or 15, characterized in that The primary and secondary types of the first cell and the second cell are indicated in any one of the following ways: Indicating the primary and secondary types of the first cell and the second cell by using a cell parameter in an RRC message structure; A primary and secondary type of the first cell and the second cell is agreed upon through a protocol; The primary and secondary types of the first cell and the second cell are indicated through a MAC CE message.

17. The method according to claim 16, characterized in that The manner of agreeing on the primary and secondary types of the first and second cells through a protocol includes at least one of the following: It is agreed that the cell corresponding to the first group of cell parameters bound to the LTM candidate cell identifier is the primary cell, and the cells corresponding to the remaining groups of cell parameters are secondary cells; It is agreed that the cell corresponding to the last set of cell parameters bound to the LTM candidate cell identifier is the primary cell, and the cells corresponding to the remaining sets of cell parameters are secondary cells; It is agreed that when a group of cell parameters bound to the LTM candidate cell identifier includes parameters related to uplink early synchronization configuration, the cell corresponding to the cell parameters is a primary cell; otherwise, the cell corresponding to the cell parameters is a secondary cell.

18. The method according to any one of claims 14 to 17, characterized in that A first message is received, where the first message is used to request the first node to perform early synchronization for the carrier aggregation, where the early synchronization includes early uplink synchronization and / or early downlink synchronization.

19. The method according to claim 18, characterized in that The first indication information in the first message is used to instruct the first node to send a random access signal in a kth candidate cell of at least two candidate cells, where k is a positive integer, and the random access information is used to determine the timing advance TA of the first cell and the second cell.

20. The method according to any one of claims 14 to 19, characterized in that Also includes: A handover command message is received, where the handover command message is used to instruct the first node to hand over to the first cell.

21. The method according to claim 19, wherein The kth candidate cell satisfies any of the following conditions: The kth candidate cell is the first cell among the at least two candidate cells; The kth candidate cell is the last cell among the at least two candidate cells; The kth candidate cell is a middle cell among the at least two candidate cells; The kth candidate cell is a cell among the at least two candidate cells configured with physical random access channel PRACH resources.

22. The method according to claim 18 or 19, characterized in that The early synchronization method includes uplink and downlink synchronization based on configuration information of the candidate cell or a random access method; If the TA is not obtained through the handover command message, the TA is obtained by initiating random access.

23. The method according to claim 22, characterized in that The method of acquiring the TA by initiating random access includes at least one of the following: Initiate random access through the primary cell to obtain the TA value; Initiate random access through the first or last candidate cell in the configuration information to obtain the TA value; Initiate random access through the secondary cell to obtain the TA value; If the configuration information configures multiple secondary cells, random access is initiated through the first or last secondary cell to obtain the TA value; Initiate random access through any cell configured in the configuration information to obtain the TA value; Initiate random access through the target cell indicated by the timing advance command to obtain the TA value; When the kth cell in a group of candidate cells is configured with PRACH resources, random access is initiated through the kth cell to obtain a TA value.

24. A method in a second node for wireless communication, characterized in that: include: A first switching command message and a second switching command message are sent, the first switching command message is used to notify the first node to switch to the first cell, and the second switching command message is used to notify the first node to switch to the second cell; the first switching command message and the second switching command message are used to indicate that when the first node switches to the first cell based on layer 1 / layer 2, carrier aggregation communication is performed at least on the first cell and the second cell, wherein the first cell is used as the primary cell for carrier aggregation, and the second cell is used as the secondary cell for carrier aggregation.

25. The method according to claim 24, characterized in that The first handover command message and the second handover command message are used to determine the primary and secondary cell types.

26. The method according to claim 25, characterized in that The first handover command message and the second handover command message are used to determine the primary and secondary cell types, including: When the first handover command message and the second handover command message are transmitted through the same TB, the primary and secondary cell types are determined according to the order of the first handover command message and the second handover command message in the TB; or, when the first handover command message and the second handover command message are transmitted through different TBs, the primary and secondary cell types are determined according to the order in which the handover command messages are received; Alternatively, the primary and secondary cell types are determined according to a received notification message, where the notification message indicates the primary and secondary cell types of the first candidate cell and the second candidate cell.

27. A communication device, characterized in that: The method comprises a unit or module for executing the method according to any one of claims 1 to 10 or 11 to 13.

28. A communication device, characterized in that: The method comprises a unit or module for performing the method according to any one of claims 14 to 23 or 24 to 26.

29. A first node used for wireless communication, characterized in that: The node comprises a transceiver, a memory and a processor, wherein the memory is used to store a program, and the processor is used to call the program in the memory and control the transceiver to receive or send a signal so that the node executes the method according to any one of claims 1 to 10 or 11 to 13.

30. A second node used for wireless communication, characterized in that: The node comprises a transceiver, a memory and a processor, wherein the memory is used to store a program, and the processor is used to call the program in the memory and control the transceiver to receive or send a signal so that the node executes the method as described in any one of claims 14-23 or 24-26.

31. A communication device, characterized in that: comprising at least one processor; and One or more non-transitory computer-readable storage media, coupled to the at least one processor and storing programming instructions for execution by the at least one processor, wherein the programming instructions, when executed, cause the at least one processor to perform the method of any one of claims 1-10, 11-13, 14-23, or 24-26.

32. A chip, characterized in that: The device comprises a processor configured to call a program from a memory so that a device equipped with the chip executes the method according to any one of claims 1 to 10, 11 to 13, 14 to 23 or 24 to 26.

33. A computer-readable storage medium, characterized in that A program is stored thereon, the program causing a computer to execute the method according to any one of claims 1-10, 11-13, 14-23 or 24-26.

34. A computer program product, characterized in that The method comprises a program for causing a computer to execute the method according to any one of claims 1 to 10, 11 to 13, 14 to 23 or 24 to 26.

35. A computer program, characterized in that The computer program causes a computer to execute the method of any one of claims 1-10, 11-13, 14-23 or 24-26.

Images