CN111903154B

CN111903154B - Method and apparatus for wireless communication

Info

Publication number: CN111903154B
Application number: CN201980019793.2A
Authority: CN
Inventors: 许阳; 卢前溪
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-02-12
Filing date: 2019-02-12
Publication date: 2022-03-11
Anticipated expiration: 2039-02-12
Also published as: WO2020163999A1; CN111903154A

Abstract

A method and apparatus of wireless communication are provided, the method comprising: the first access network node sends first indication information to the first core network node and/or sends second indication information to the terminal equipment; wherein the first indication information is used to trigger at least one second core network node to send or receive duplicated data packets to or from at least one terminal device via at least one access network node; the second indication information is used for triggering the terminal device to send the duplicated data packets to the at least one second core network node through the at least one access network node or receive the duplicated data packets sent from the at least one second core network node through the at least one access network node.

Description

Method and apparatus for wireless communication

Technical Field

The embodiments of the present application relate to the field of communications, and more particularly, to a method and apparatus for wireless communication.

Background

In a New Radio (NR) system, a time when data transmission is affected is a data jitter time, which may include a data transmission interruption time, for example, when a user using network service moves from one cell to another cell, a communication link between the user and a source cell is disconnected, a communication connection between the user and a New cell is established, that is, a handover process is performed, during which data transmission interruption may occur, which affects normal transmission of data, especially Ultra-Reliable Low Latency Communications (URLLC), and therefore, how to perform uplink and downlink data transmission to reduce the data jitter time is a problem worthy of research.

Disclosure of Invention

A method and apparatus for wireless communication are provided that may enable redundant data transmission to reduce data jitter time.

In a first aspect, a method of wireless communication is provided, including: the first access network node sends first indication information to the first core network node and/or sends second indication information to the terminal equipment; wherein the first indication information is used to trigger at least one second core network node to send or receive duplicated data packets to or from at least one terminal device through at least one access network node; or the first indication information is used for triggering at least one second core network node to send a duplicated data packet to at least one access network node or receive a duplicated data packet sent by the at least one access network node; the second indication information is used for triggering the terminal equipment to send a duplicated data packet to at least one second core network node through at least one access network node or receive a duplicated data packet sent by at least one access network node from at least one second core network node; or the second indication information is used for triggering the terminal device to send the duplicated data packet to at least one access network node or receive the duplicated data packet sent by at least one access network node.

In a second aspect, a method of wireless communication is provided, including: a first core network node receives first indication information sent by a first access network node, wherein the first indication information is used for indicating that the first core network node triggers at least one second core network node to send a duplicated data packet to at least one access network node or receives a duplicated data packet sent by the at least one access network node, or the first indication information is used for indicating that the first core network node triggers the at least one second core network node to send a duplicated data packet to at least one terminal device through the at least one access network node or receives a duplicated data packet sent by the at least one terminal device through the at least one access network node; the first core network node sends a first message to the at least one second core network node, where the first message is used to trigger the at least one second core network node to send or receive a duplicated data packet to or from the at least one access network node, or the first message is used to trigger the at least one second core network node to send or receive a duplicated data packet to or from at least one terminal device through the at least one access network node.

In a third aspect, a method of wireless communication is provided, including: the terminal equipment receives second indication information sent by a first access network node, wherein the second indication information is used for triggering the terminal equipment to send a copied data packet to at least one second core network node through at least one access network node or receiving the copied data packet sent by the at least one second core network node through the at least one access network node; or the second indication information is used for triggering the terminal device to send the duplicated data packet to at least one access network node or receive the duplicated data packet sent by at least one access network node.

In a fourth aspect, a method of wireless communication is provided, comprising: the first access network node sends the replicated data packets to at least one second access network node.

In a fifth aspect, a method of wireless communication is provided, including: the first access network node sends a second message to the first core network node, and/or sends a third message to the terminal device, wherein the second message is used for instructing the first core network node to stop at least one second core network node from sending copied data packets to at least one access network node and/or receiving copied data packets sent by the at least one access network node, and the third message is used for stopping the terminal device from sending copied data packets to the at least one access network node and/or receiving copied data packets sent by the at least one access network node.

A sixth aspect provides a device for wireless communication, configured to perform the method of the first aspect and any one of the possible implementations of the first aspect, or configured to perform the method of the second aspect and any one of the possible implementations of the second aspect, or configured to perform the method of the third aspect and any one of the possible implementations of the third aspect, or configured to perform the method of the fourth aspect and any one of the possible implementations of the fourth aspect, or configured to perform the method of the fifth aspect and any one of the possible implementations of the fifth aspect.

In particular, the apparatus may comprise means for performing the method of the first aspect and any one of the possible implementations of the first aspect, or means for performing the method of the second aspect and any one of the possible implementations of the second aspect, or means for performing the method of the third aspect and any one of the possible implementations of the third aspect, or means for performing the method of the fourth aspect and any one of the possible implementations of the fourth aspect, or means for performing the method of any one of the possible implementations of the fifth aspect.

In a seventh aspect, an apparatus for wireless communication is provided that includes a processor and a memory. The memory is configured to store a computer program, and the processor is configured to call and execute the computer program stored in the memory to perform the method in any one of the possible implementations of the first aspect and the first aspect, or to perform the method in any one of the possible implementations of the second aspect and the second aspect, or to perform the method in any one of the possible implementations of the third aspect and the third aspect, or to perform the method in any one of the possible implementations of the fourth aspect and the fourth aspect, or to perform the method in any one of the possible implementations of the fifth aspect and the fifth aspect.

In an eighth aspect, a chip is provided for implementing the method in any one of the possible implementations of the first to fifth aspects or the first to fifth aspects. Specifically, the chip includes: a processor, configured to call and run a computer program from a memory, so that a device on which the chip is installed executes the method in any one of the above-described first to fifth aspects or any one of the possible implementation manners of the first to fifth aspects.

In a ninth aspect, there is provided a computer readable storage medium for storing a computer program, the computer program causing a computer to perform the method of any one of the possible implementations of the first to fifth aspects or the first to fifth aspects.

A tenth aspect provides a computer program product comprising computer program instructions to cause a computer to perform the method of the first to fifth aspects or any possible implementation manner of the first to fifth aspects.

In an eleventh aspect, there is provided a computer program which, when run on a computer, causes the computer to perform the method of any one of the possible implementations of the first to fifth aspects or the first to fifth aspects described above.

Based on the technical scheme, the first access network node can trigger at least one second core network node to perform redundant transmission through the first indication information and/or trigger the terminal equipment to perform redundant transmission through the second indication information, which is favorable for reducing data jitter time in the scene of data interruption possibly occurring in cell switching and the like.

Drawings

Fig. 1 is a schematic diagram of a communication system architecture provided in an embodiment of the present application.

Fig. 2 is a schematic flow diagram of a cell handover procedure.

Fig. 3 is a signaling interaction diagram of a cell handover procedure.

Fig. 4 is a signaling interaction diagram of another cell handover preparation phase.

Fig. 5 is a schematic flow chart diagram of a method of wireless communication according to an embodiment of the present application.

Fig. 6 is a schematic flow chart diagram of a method of wireless communication according to another embodiment of the present application.

Fig. 7 is a schematic flow chart diagram of a method of wireless communication according to yet another embodiment of the present application.

Fig. 8 is a signaling interaction diagram of a method of wireless communication according to an embodiment of the application.

Fig. 9 is a signaling interaction diagram of a method of wireless communication according to another embodiment of the present application.

Fig. 10 is a schematic diagram of a manner of redundant transmission according to an embodiment of the present application.

Fig. 11 is a schematic diagram of another manner of redundant transmission according to an embodiment of the present application.

Fig. 12 is a schematic block diagram of a device for wireless communication according to an embodiment of the present application.

Fig. 13 is a schematic block diagram of a device for wireless communication according to an embodiment of the present application.

Fig. 14 is a schematic block diagram of a device for wireless communication according to another embodiment of the present application.

Fig. 15 is a schematic block diagram of a device for wireless communication according to yet another embodiment of the present application.

Fig. 16 is a schematic block diagram of a device for wireless communication according to yet another embodiment of the present application.

Fig. 17 is a schematic block diagram of a communication device of an embodiment of the present application.

Fig. 18 is a schematic flow chart of a chip of an embodiment of the present application.

Fig. 19 is a schematic block diagram of a communication system of an embodiment of the present application.

Detailed Description

Technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The technical scheme of the embodiment of the application can be applied to various communication systems, for example: a Global System for Mobile communications (GSM) System, a Code Division Multiple Access (CDMA) System, a Wideband Code Division Multiple Access (WCDMA) System, a General Packet Radio Service (GPRS), a Long Term Evolution (Long Term Evolution, LTE) System, an LTE Frequency Division Duplex (FDD) System, an LTE Time Division Duplex (TDD), a Universal Mobile Telecommunications System (UMTS), a Worldwide Interoperability for Microwave Access (WiMAX) communication System, or a 5G System.

Illustratively, a communication system 100 applied in the embodiment of the present application is shown in fig. 1. The communication system 100 may include an access network device 110, and the access network device 110 may be a device that communicates with a terminal device 120 (or referred to as a communication terminal, a terminal). Access network device 110 may provide communication coverage for a particular geographic area and may communicate with terminal devices located within the coverage area. Optionally, the Access Network device 110 may be a Base Transceiver Station (BTS) in a GSM system or a CDMA system, a Base Station (NodeB, NB) in a WCDMA system, an evolved Node B (eNB or eNodeB) in an LTE system, or a wireless controller in a Cloud Radio Access Network (CRAN), or the Network device may be a Mobile switching center, a relay Station, an Access point, a vehicle-mounted device, a wearable device, a hub, a switch, a bridge, a router, a Network-side device in a 5G Network, or a Network device in a Public Land Mobile Network (PLMN) for future evolution, or the like.

The communication system 100 further comprises at least one terminal device 120 located within a coverage area of a Radio Access Network (RAN) device 110. As used herein, "terminal equipment" includes, but is not limited to, connections via wireline, such as Public Switched Telephone Network (PSTN), Digital Subscriber Line (DSL), Digital cable, direct cable connection; and/or another data connection/network; and/or via a Wireless interface, e.g., to a cellular Network, a Wireless Local Area Network (WLAN), a digital television Network such as a DVB-H Network, a satellite Network, an AM-FM broadcast transmitter; and/or means of another terminal device arranged to receive/transmit communication signals; and/or Internet of Things (IoT) devices. A terminal device arranged to communicate over a wireless interface may be referred to as a "wireless communication terminal", "wireless terminal", or "mobile terminal". Examples of mobile terminals include, but are not limited to, satellite or cellular telephones; personal Communications Systems (PCS) terminals that may combine cellular radiotelephones with data processing, facsimile, and data Communications capabilities; PDAs that may include radiotelephones, pagers, internet/intranet access, Web browsers, notepads, calendars, and/or Global Positioning System (GPS) receivers; and conventional laptop and/or palmtop receivers or other electronic devices that include a radiotelephone transceiver. Terminal Equipment may refer to an access terminal, User Equipment (UE), subscriber unit, subscriber station, mobile station, remote terminal, mobile device, User terminal, wireless communication device, User agent, or User Equipment. An access terminal may be a cellular telephone, a cordless telephone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device having Wireless communication capabilities, a computing device or other processing device connected to a Wireless modem, a vehicle mounted device, a wearable device, a terminal device in a 5G network, or a terminal device in a future evolved PLMN, etc.

Optionally, a Device to Device (D2D) communication may be performed between the terminal devices 120.

Alternatively, the 5G system or the 5G network may also be referred to as a New Radio (NR) system or an NR network.

It should be understood that the terms "system" and "network" are often used interchangeably herein. The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

Fig. 1 exemplarily shows one network device and two terminal devices, and optionally, the communication system 100 may include a plurality of network devices and may include other numbers of terminal devices within the coverage of each network device, which is not limited in this embodiment of the present application.

The communication system 100 may further include core Network devices, such as a control Plane node like an Access Management Function (AMF) and a Session Management Function (SMF), a User Plane node like a Data Network (DN) and a User Plane Function (UPF). Wherein, the UE is connected to the access network device via a Radio Resource Control (RRC) protocol; the access network equipment is connected with the AMF through an N2 interface, and the access network equipment is connected with the UPF through an N3 interface; the UPF is connected with DN through N6 interface, at the same time, the UPF is connected with SMF through N4 interface, SMF is connected with AMF through N11 interface, SMF controls UPF through N4 interface.

It should be understood that the terms "system" and "network" are often used interchangeably herein.

It should be understood that a device having a communication function in a network/system in the embodiments of the present application may be referred to as a communication device. Taking the communication system 100 shown in fig. 1 as an example, the communication device may include an access network device 110 and a terminal device 120 having a communication function, and the access network device 110 and the terminal device 120 may be the above-mentioned specific devices, which are not described herein again; the communication device may also include other devices in the communication system 100, such as other core network entities, for example, a network controller, a mobility management entity, and the like, which is not limited in this embodiment.

It should be understood that the method of the embodiments of the present application may be used to transmit various types of services.

Such as enhanced Mobile broadband service (eMBB), which targets users to obtain multimedia content, services, and data, the demand for eMBB is growing rapidly. Also for example, Ultra-Reliable Low Latency Communications (URLLC), typical applications of URLLC include: industrial automation, electric power automation, remote medical operation (surgery), traffic safety, and the like. For another example, mass Machine Type Communication (mtc), typical characteristics of mtc include: high connection density, small data volume, insensitive time delay service, low cost and long service life of the module, etc.

In the communication system, when a user using network service moves from one cell to another cell or due to the adjustment of wireless transmission traffic load, activation of operation maintenance, equipment failure and the like, in order to ensure the continuity of communication and the quality of service, the system transfers the communication link between the user and the original cell to a new cell, that is, performs a handover process.

Fig. 2 is a schematic flow chart of the Xn interface-based handover procedure, and as shown in fig. 2, the whole handover procedure can be divided into the following three stages:

(1) a switching preparation stage: including measurement control and reporting, handover requests, and acknowledgements.

(2) A switching execution stage: the UE immediately executes the switching process after receiving the switching command, namely the UE disconnects the source cell and is connected with the target cell (for example, random access is executed, and an RRC switching completion message is sent to the target base station and the like); SN state transfer, data forwarding.

(3) And a switching completion stage: the target cell performs Path Switch with the AMF and the UPF, releasing the UE context of the source base station.

In the handover complete phase (S11-S18), it may include:

in 11, the target base station sends a path switch request to the AMF.

In 12, after receiving the path switching Request of the target base station, the AMF sends a Session update Management (SM) context Request (Nsmf _ PDU _ update _ smcontext Request) for updating the PDU Session of the target base station to the SMF entity.

Further, in 13, the SMF entity sends a Session Modification Request to the UPF entity (N4 Session Modification Request).

In 14, the UPF entity sends a Session Modification Response to the SMF entity (N4 Session Modification Response).

In 15, the UPF entity sends an N3 end flag to the source base station, and the source base station sends an N3 end flag to the target base station for clearing the path flag between the UPF entity and the source base station.

And executing path switching with a User Plane Function (UPF) to clear the path mark of the User Plane of the source base station.

In 16, the SMF entity sends a PDU session update SM context Response (Nsmf _ PDU _ update smcontext Response) to the AMF entity.

In 17, after the path switching is completed, the AMF may transmit a path switching acknowledgement message to the target base station.

In 18, the target base station sends a terminal device context release message to the source base station, informs the source base station of successful handover, and triggers the source base station to release the terminal device context. At this point, the handover is completed.

Further, a registration procedure of the terminal device at the target base station may be performed in S19.

Fig. 3 shows a specific signaling interaction flow of the handover procedure, and as shown in fig. 3, the handover preparation phase (201-205) may include:

in 201, the source base station triggers the terminal device to perform the neighbor cell measurement, so that the terminal device can perform the measurement on the neighbor cell and report the measurement result to the source base station.

In 202, the source base station evaluates the measurement result reported by the terminal device, and determines whether to trigger handover.

If the source base station decides to trigger a handover, a handover request may be sent to the target base station at 203.

In 204, after receiving the handover request sent by the source base station, the target base station may start admission according to the service information carried by the source base station, and perform radio resource configuration.

In 205, the target base station sends a handover request acknowledge message to the source base station, and returns the admission result and the radio resource configuration information in the target base station to the source base station. At this point, the handover preparation phase is complete.

In the second phase, the handover execution phases (206-208) may include:

in 206, after receiving the handover request acknowledge message of the target base station, the source base station may trigger the terminal device to perform handover.

In 207, the source base station may forward buffered data, on-going packets, system sequence numbers of the data, etc. to the target base station. Also, the target base station may buffer data received from the source base station

In addition, the terminal equipment can disconnect from the source base station and establish synchronization with the target base station.

In 208, the terminal device synchronizes to the target base station. At this point, the handover execution phase is complete.

In the third stage, the handover completion stage (209-212) may include:

in 209, the target base station sends a path switch request to a Mobility Management Function (AMF).

In 210, after receiving the path switch request from the target base station, the AMF performs path switch with a User Plane Function (UPF) to clear the path flag of the User Plane of the source base station.

In 211, after the path switch is completed, the AMF may transmit a path switch acknowledgement message to the target base station.

In 212, the target base station sends a terminal device context release message to the source base station, informs the source base station of successful handover, and triggers the source base station of the terminal device context. At this point, the handover is completed.

Fig. 4 is a schematic diagram of a handover procedure based on an N2 interface, and fig. 4 is a signaling interaction diagram of a handover preparation phase, and as shown in fig. 4, the following may be included:

the handover preparation phase (S501 to S506) may include:

in S501, the source base station sends a handover request to the core network control plane, for requesting handover to the target base station.

In S502, information interaction is performed between the core network control plane and the core network user plane, so as to modify the PDU session of the UE on the target base station side.

Further, in S503, the core network control plane sends a handover request to the target base station.

In S504, the target base station sends a handover request response to the core network control plane.

In S505, information interaction is performed between the core network control plane and the core network user plane, which is used to update the PDU session of the UE on the target base station side.

In S506, the core network control plane sends a handover command to the source base station to notify the source base station that the handover preparation phase is completed, and the handover execution phase may be executed.

In S507, an air interface handover procedure is performed among the UE, the source base station, and the target base station.

In S508, the UE notifies the target base station of the completion of handover.

Further, in S509, the target base station transmits a handover completion notification to the core network control plane.

In S510, the core network control plane and the core network user plane perform session update, and delete the PDU session on the source base station side.

As can be known from the handover processes shown in fig. 3 to fig. 5, the handover time of the UE from the source base station to the target base station may include air interface handover time and core network interaction time. And the air interface switching time is the time for switching the UE from the source base station to the target base station on the air interface.

The data interruption time is the time between the disconnection of the UE from the source base station and the establishment of the connection with the target base station, and is approximately the same as the air interface switching time.

Data jitter time, the time that data transmission is affected, may include data interruption time and the time required for data to be able to be transmitted but forwarded.

Therefore, the cell switching can increase the data jitter time, which affects the normal transmission of data, especially for URLLC service, and if the data cannot be transmitted in time, the user experience is affected.

Fig. 5 is a schematic flow chart diagram of a method 600 of wireless communication in an embodiment of the present application. The method 600 may be performed by an access network device. Such as access network device 110 shown in fig. 1. As shown in fig. 5, the method 600 includes some or all of the following:

in 601, a first access network node sends first indication information to a first core network node, where the first indication information is used to trigger at least one second core network node to send a duplicated data packet to at least one terminal device through at least one access network node or receive a duplicated data packet from at least one terminal device through the at least one access network node; or the first indication information is used to trigger at least one second core network node to send a duplicated data packet to at least one access network node or receive a duplicated data packet sent by the at least one access network node.

It should be understood that, in this embodiment of the present application, the redundant transmission may include an uplink redundant transmission and a downlink redundant transmission, where the downlink redundant transmission may refer to that at least one core network user plane node sends duplicated downlink data to multiple access network nodes, and further sends the duplicated downlink data to at least one terminal device through the multiple access network nodes, that is, the at least one core network user plane node may send duplicated uplink data packets to at least one terminal device through the multiple access network nodes; the uplink redundant transmission may refer to that at least one terminal device may send duplicated uplink data to multiple access network nodes, and send the duplicated uplink data to at least one core network user plane through the multiple access network nodes, that is, the at least one core network user plane may receive duplicated uplink data packets sent by the at least one terminal device through the multiple access network nodes.

That is, in this embodiment of the present application, the first access network node may instruct, through the first indication information, the first core network node to trigger the at least one second core network node to perform uplink redundant transmission and/or downlink redundant transmission.

Optionally, in some embodiments, the first core network node may be a core network control plane node, such as an AMF entity or an SMF entity, and the second core network node may be a core network user plane node, such as a UPF entity.

Optionally, in other embodiments, the first core network node and the second core network node may be the same core network node, for example, both core network user plane nodes. In this case, the first access network node may include the first indication information in a data packet sent to the first core network node, so as to trigger the first core network node to perform redundant transmission.

After receiving the first indication information, further, in 602, the first core network node may send a first message to at least one second core network node, where the first message is used to trigger the at least one second core network node to send duplicated data packets to multiple access network nodes or receive duplicated data packets sent by the multiple access network nodes.

That is, the first core network node may send a first message to at least one second core network node according to the first indication information, where the first message is used to trigger the second core network node to perform redundant uplink transmission and/or redundant downlink transmission.

Further, in 603, after receiving the first message, the at least one second core network node may send a duplicated data packet to the at least one access network node, where the duplicated data packet is a data packet sent to at least one terminal device, that is, the at least one second core network node may perform downlink redundant transmission through the at least one first access network node; or the at least one second core network node receives a duplicated data packet sent by the at least one access network node, where the duplicated data packet is sent by at least one terminal device, that is, the at least one second core network node may perform redundant uplink transmission through the at least one first access network node.

By way of example and not limitation, the first indication information includes at least one of:

an indication of whether to perform a redundant transmission;

sending an indication of the duplicated data packets to the at least one access network node, i.e. whether to perform redundant downlink transmission;

receiving an indication of the duplicated data packets sent by the at least one access network node, i.e. whether to perform redundant uplink transmission;

the identification information of the at least one access network node, the information of the target access network node executing redundant transmission;

the correspondence between the at least one access network node and the at least one second core network node may be, for example, one-to-one correspondence, or many-to-one correspondence;

characteristic information of a data packet needing redundant transmission;

transmitting time information of the copied data packet;

receiving time information of the duplicated data packet;

an indication of redundant transmission between the core network and the access network;

an indication of redundant transmission is made between the access network and the terminal device.

Optionally, in some embodiments, the characteristic information of the data packet requiring redundant transmission includes at least one of the following:

the network protocol IP address, the media access control MAC address, the port number, the data stream identifier, the session identifier and the application identifier of the terminal equipment and/or the application server.

Optionally, in some embodiments, the time information for sending the duplicated data packet includes a time point and/or a duration of sending the duplicated data packet;

the time information for receiving the duplicated data packet includes a time point and/or a duration of time for receiving the duplicated data packet.

Optionally, in some specific scenarios, for example, a cell handover scenario, the terminal device may be handed over from a source access network node to at least one target access network node, in which case the first access network node may be a source access network node (corresponding to RAN node 1), and the at least one second access network node may include at least one target access network node (corresponding to RAN node 2 to RAN node n) of the terminal device, and optionally, in some cases, the at least one second access network node may also include the source access network node.

In some embodiments, the source access network node may execute a handover preparation request to a plurality of access network nodes, and determine at least one access network node as an access network node to be accessed according to reply information of the plurality of access network nodes, in an implementation, the source access network node may notify the selected at least one access network node to the terminal device, for example, send to the terminal device through a handover command, and optionally, may further include a priority list of the at least one access network node, to which access network node the terminal device determines to handover to. Or, in another implementation manner, the source access network node may determine one or more target access network nodes to which the terminal device is switched, and send the target access network nodes to the terminal device through the switching command, and the terminal device directly accesses the specified access network node according to the information of the target access network node sent by the source access network node.

Without loss of generality, the method for wireless communication according to the embodiment of the present application is described by taking, as an example, a first access network node as a RAN node 1, a first core network node as a core network control plane node, a second core network node as a core network user plane node, and at least one access network node includes at least one of the RAN node 1 to the RAN node n, but the embodiment of the present application is not limited thereto.

It should be understood that, in this embodiment of the present application, there may be one or more terminal devices that send an uplink data packet to a core network user plane node, and there may be one or more core network user plane nodes that receive an uplink data packet of a terminal device, which is not limited in this embodiment of the present application. The embodiment of the present application is described by taking only one UE and one core network user plane node as examples, but the embodiment of the present application is not limited thereto.

Optionally, in some embodiments, the method 600 further comprises:

and the first core network node determines the at least one second core network node for performing redundant transmission in a plurality of second core network nodes according to at least one of Single network slice selection assistance information (S-NSSAI), an external network service node (DNN), subscription information of a user and a user policy of a data stream or a Single network slice selection assistance information of a session corresponding to the data packet.

In this embodiment of the application, in order to enable the terminal device to perform data transmission in time when accessing the target access network node, the source access network node may send first indication information to the first core network node before preparation for handover, or during preparation for handover, or after preparation for handover, to indicate the at least one second core network node to perform downlink redundant transmission and/or uplink redundant transmission, so that the terminal device may immediately receive downlink data sent by the target access network node after handover is completed, reduce data jitter time during handover, and improve user experience.

Optionally, in an embodiment of the present application, as shown in fig. 6, the method 600 may further include:

604, the first access network node sends second indication information to the terminal device, where the second indication information is used to trigger the terminal device to send a duplicated data packet to at least one access network node and/or receive a duplicated data packet sent by the at least one access network node.

That is to say, in this embodiment of the application, the first access network node may trigger the terminal device to perform uplink redundant transmission and/or downlink redundant transmission through the second indication information, that is, trigger the terminal device to send a duplicated data packet to at least one core network user plane node, or receive a duplicated packet sent by at least one core network user plane.

By way of example and not limitation, the second indication information includes at least one of:

the method comprises the steps of executing an indication of redundant transmission, sending an indication of a duplicated data packet to at least one access network node, receiving an indication of a duplicated data packet sent by at least one access network node, identification information of at least one access network node, a corresponding relation between at least one access network node and at least one second core network node, characteristic information of a data packet needing redundant transmission, sending time information of the duplicated data packet, receiving time information of the duplicated data packet, conducting an indication of redundant transmission between a core network and an access network, and conducting an indication of redundant transmission between the access network and a terminal device.

The detailed description of the second indication information may refer to the related description of the first indication information, and is not repeated here.

Further, in 605, the terminal device may send a duplicated uplink data packet to at least one access network node, or receive a duplicated downlink data packet sent by the at least one access network node.

In a handover scenario, the at least one access network node may include a source access network node and/or at least one target access network node, that is, the terminal device may initiate uplink redundant transmission to the at least one access network node, so that after the terminal device is successfully handed over, the at least one access network node may directly send uplink data (for example, URLLC data) sent by the terminal device to the core network user plane node, thereby reducing data jitter time in a handover process and improving user experience.

It should be understood that in the embodiment of the present application, the method 600 may include only 601, 602, and 603, or may also include only 604 and 605, or may also include all the steps described above.

The following describes a method for wireless communication according to an embodiment of the present application in detail in conjunction with a handover scenario of a terminal device.

In this embodiment, the first access network node may be a source access network node, and the source access network node may send the first indication information to the first core network node before handover preparation, or may send the first indication information to the first core network node after handover preparation, as shown in fig. 7, or may send the first indication information to the first core network node in a handover preparation phase, for example, as shown in fig. 8 or 9.

Optionally, in this embodiment of the present application, the first indication information may be carried in any message or signaling for performing communication between an access network node and a core network node, which is not limited in this embodiment of the present application.

Optionally, in some embodiments, an information field may be newly added in an existing message to carry the first indication information, or a reserved information field may also be used to carry the first indication information.

For example, the first indication information may be carried in a Handover Request (Handover Request) or a Handover Request (Handover Required) sent by the first access network node, or may also be carried in another message used for communication between the core network node and the RAN node.

Optionally, in other embodiments, the first indication information may also be carried in an additional message or signaling, that is, the additional message may be used to trigger the core network user plane node to perform redundancy transmission.

Optionally, in this embodiment of the present application, the source access network node may send the second indication information to the terminal device before handover preparation, or may also send the second indication information to the terminal device after handover preparation, as shown in fig. 7, or may also send the second indication information to the terminal device in a handover preparation phase, for example, as shown in fig. 8 or 9.

Optionally, in this embodiment of the application, the second indication information may be carried in any message or signaling for performing communication between the access network node and the terminal device, for example, an RRC message or a physical layer signaling, which is not limited in this embodiment of the application.

Optionally, in some embodiments, an information field may be newly added in an existing message to carry the second indication information, or a reserved information field may also be used to carry the first indication information.

For example, the second indication information may be carried in a Handover request (Handover Command) sent by the first access network node, or may be carried in another message used for communication between the access network node and the terminal device.

Optionally, in other embodiments, the second indication information may also be carried in an additional message or signaling, that is, the additional message may be used to trigger the terminal device to perform redundant transmission.

Fig. 8 is a schematic flow chart of a specific implementation of triggering redundant transmission in a handover preparation process, where fig. 8 is based on the handover process based on the N2 interface shown in fig. 4, and as shown in fig. 8, the following may be included:

in S301, the source base station may send a handover request to the core network control plane, where the handover request may include the first indication information.

Wherein S301 may correspond to S501 in fig. 4.

In S302, the core network control plane may send a session modification request to a core network user plane node, where the session modification request includes the first indication information, so as to trigger the core network user plane node to send a duplicated data packet to at least one access network node and/or receive a duplicated data packet sent by the at least one access network node. I.e. the first message may be a session modification request message.

In S303, the core network control plane may send a handover request to the target base station.

In S304, the target base station may send a handover request response to the core network control plane.

In S305, the core network user plane sends a session modification response to the core network control plane.

In S310, the source base station may further send a Handover Command (Handover Command) to the UE, where the Handover Command includes the second indication information.

It is to be understood that the S302, S303, S304, S305 and S310 may correspond to S502, S503, S504, S505 and S506 in fig. 4.

After S305, in S311, the core network user plane node may send the replicated downlink data to at least one target base station.

Optionally, the core network user plane node may also send the copied downlink data to the source base station at the same time, or the core network user plane node may also send the copied downlink data to the source base station before S304.

Therefore, the first access network node may send a handover request to the core network control plane node in a handover preparation process, and notify the core network control plane node to trigger a core network user plane node to perform redundant transmission through the handover request carrying the first indication information.

Meanwhile, the first access network node may also send a handover command to the UE in a handover preparation process, and trigger the terminal device to perform redundant transmission by using the handover command carrying the second indication information.

Fig. 9 is a schematic flowchart of a specific implementation of triggering redundant transmission in a handover preparation process, where fig. 9 is based on the Xn interface-based handover process shown in fig. 3, and in the handover process, an air interface handover process and a session establishment process are performed in parallel. As shown in fig. 9, the following may be included:

in 401, the target base station may send a session establishment request or a session update request to the core network control plane, where the session establishment request or the session update request may include the first indication information, where the first indication information may be sent by the source base station to the target base station, for example, the source base station sends the first indication information to the target base station through a handover request;

optionally, in some embodiments, in 402, the source base station sends a session establishment request or a session update request to the core network control plane, and the first indication information may be included in the session establishment request or the session update request.

That is, the first indication information may be directly transmitted to the core network control plane node by the source base station, or may be transmitted to the core network control plane node by the target base station.

Further, in 403, the core network control plane node may send a session establishment request or a session update request to the core network user plane node, where the session establishment request or the session update request carries the first indication information. I.e. the first message may be a session establishment request or a session update request message.

In S405, before the terminal device is switched, the target base station may buffer or discard the currently received downlink data, and further send the downlink data to the terminal device after the switching is completed.

In this embodiment, the source base station may send the second indication information to the terminal device in a handover command that triggers air interface handover of the UE.

Optionally, in some embodiments, the access network node and the core network user plane node may correspond to multiple access network nodes with one core network user plane node, for example, as shown in fig. 10, so that the core network user plane node may send the copied downlink data to the multiple access network nodes, and further send the copied downlink data to at least one terminal device through the multiple access network nodes.

Corresponding to the example shown in fig. 10, the core network user plane node corresponds to the RAN node 1 to the RAN node n, and then the core network user plane node may send the copied downlink data to the RAN node 1 to the RAN node n, and further, the RAN node 1 to the RAN node n may send the copied downlink data to the UE. Likewise, the terminal device may send uplink data to the RAN node 1 to RAN node n, and further, the RAN node 1 to RAN node n may send the duplicated uplink data to the core network user plane node.

Optionally, in other embodiments, the access network nodes and the core network user plane nodes may be in one-to-one correspondence, as shown in fig. 11, in this case, the second core network node may send the downlink data to the corresponding access network node, and further, the access network node may send the copied downlink data to another access network node through an Xn interface, so that the access network node that receives the copied downlink data may transmit the copied downlink data to the terminal device.

Corresponding to the example shown in fig. 11, the core network user plane node corresponds to the RAN node 2, and then the core network user plane node may send the downlink data to the RAN node 2, further, the RAN node 2 may send the copied downlink data to the RAN node 1 and other RAN nodes, and further, the RAN nodes 1 to n may send the copied downlink data to the UE. Similarly, the terminal device may send uplink data to the RAN node 2, further, the RAN node 2 may copy the uplink data and send the copied uplink data to the RAN node 1 and other RAN nodes, respectively, and further, the RAN nodes 1 to RAN node n may send the copied uplink data to the core network user plane node.

Optionally, in some embodiments, the first access network node sends the replicated data packets to the at least one second access network node if certain conditions are met.

For example, the specific condition includes at least one of:

the data packet is a specific service, for example, a URLLC service, the Qos parameter of the data packet is a specific Qos parameter, the PDU session of the protocol data unit corresponding to the data packet is a specific PDU session, the data flow corresponding to the data packet is a specific data flow, and the indication of the first core network node.

Hereinafter, a manner of stopping redundant transmission will be described with reference to the specific embodiment.

Optionally, as an embodiment, when a duration of the downlink redundant transmission performed by the at least one second core network node exceeds a first duration, the at least one second core network node stops sending the duplicated data packet to some or all of the at least one access network node; or, under the condition that the time duration of the uplink redundant transmission performed by the at least one second core network node exceeds a second time duration, the at least one second core network node stops receiving the duplicated data packets sent by part or all of the at least one access network node.

Optionally, the first duration is preconfigured or obtained from the first core network node, for example, may be obtained from the first indication information in the first message; the second duration is preconfigured or obtained from the first core network node, e.g. may be obtained from the first indication information in the first message.

Optionally, the first duration and the second duration may be equal or different.

That is, the core network user plane node may stop performing the redundant transmission when the duration of performing the redundant transmission reaches a specific duration.

It should be understood that the core network user plane node may stop the uplink redundant transmission and the downlink redundant transmission at the same time, or may stop the uplink redundant transmission and the downlink redundant transmission at the same time, for example, the uplink redundant transmission and the downlink redundant transmission may be controlled based on one timer, or may be controlled based on different timers, and the durations of the different timers may be equal or may not be equal.

For example, when the core network user plane node starts to perform uplink redundant transmission, a first timer may be started, and when the first timer is overtime, the uplink redundant transmission may be stopped; when the downlink redundancy transmission is started, a second timer is started, and when the second timer is overtime, the downlink redundancy transmission is stopped. Or when starting to perform redundant transmission, a timer is started, and when the timer is overtime, the uplink redundant transmission and the downlink redundant transmission are stopped.

It should be understood that, in the embodiment of the present application, the second core network node stopping redundant transmission may include, but is not limited to, the following cases:

stopping sending redundant downlink data to all access network nodes;

stopping sending redundant downlink data to part of access network nodes;

stopping redundant transmission of a particular data stream on a particular access network node;

stopping redundant transmission of a particular service on a particular access network node;

stopping the uplink redundant transmission;

the downstream redundant transmission is stopped.

Optionally, as another embodiment, when a duration of the redundant transmission performed by the at least one second core network node exceeds a third duration, a fourth message is sent to the at least one second core network node, where the fourth message is used to instruct the at least one second core network node to stop sending the duplicated data packets to part or all of the at least one access network node, or stop receiving the duplicated data packets sent by part or all of the at least one access network node.

Optionally, the third duration is preconfigured or determined according to the first indication information, for example, the third duration may be determined according to the time information of sending or receiving the duplicated data packet in the first indication information.

That is, when the time length for the core network user plane node to perform the redundant transmission reaches a specific time length, the core network control plane node may instruct the core network user plane node to stop performing the redundant transmission.

In some cases, the core network control plane node may consider the core network user plane node to start the redundant transmission after sending the first message to the core network user plane node.

For example, the core network user plane node may start a timer after sending the first message, and send a fourth message to the core network user plane node to instruct the core network user plane node to stop the redundant transmission if the timer expires.

Optionally, as a further embodiment, when a duration of uplink redundant transmission performed by the terminal device exceeds a fourth duration, the terminal device stops sending duplicated data packets to some or all of the at least one access network node;

and under the condition that the time length of the terminal equipment for downlink redundant transmission exceeds a fifth time length, the terminal equipment stops receiving the copied data packet sent by part or all of the access network nodes in the at least one access network node.

Optionally, the fourth duration is preconfigured or determined according to the second indication information; or the fifth time period is preconfigured or determined according to the second indication information.

Optionally, the fourth time period and the fifth time period may be equal, or may not be equal.

That is, when the time length for the terminal device to perform the redundant transmission reaches a specific time length, the terminal device stops performing the redundant transmission.

It should be understood that the terminal device may stop the uplink redundant transmission and the downlink redundant transmission at the same time, or may stop the uplink redundant transmission and the downlink redundant transmission at different times, for example, the uplink redundant transmission and the downlink redundant transmission may be controlled based on one timer, or may be controlled based on different timers, and the durations of the different timers may be equal or may not be equal.

For example, when the terminal device starts to perform uplink redundant transmission, a third timer may be started, and when the third timer is overtime, the uplink redundant transmission is stopped; when the terminal equipment starts to perform downlink redundant transmission, starting a fourth timer, and stopping performing downlink redundant transmission under the condition that the fourth timer is overtime; or when starting to perform redundant transmission, a timer is started, and when the timer is overtime, the uplink redundant transmission and the downlink redundant transmission are stopped.

Optionally, as yet another embodiment, a first access network node sends a second message to a first core network node, and/or sends a third message to a terminal device, where the second message is used to instruct the first core network node to stop at least one second core network node from sending a duplicated data packet to at least one access network node and/or receive a duplicated data packet sent by the at least one access network node, and the third message is used to stop the terminal device from sending a duplicated data packet to the at least one access network node and/or receive a duplicated data packet sent by the at least one access network node.

I.e. the access network node may instruct the core network user plane node or the terminal device to stop redundant transmission.

Optionally, in a handover scenario, the first access network node may be a source access network node, or may also be a target access network node.

In this case, the first access network node may send the second message to the first core network node and/or send the third message to the terminal device after the terminal device performs handover.

After the terminal device completes the handover, the terminal device establishes a connection with the target access network node, and the core network user plane node and the terminal device may directly perform data transmission through the target access network node without performing redundant transmission any more.

As an embodiment, the first access network node is the source access network node, and the first access network node may send the second message to the first core network node and/or send the third message to the terminal device after the first access network node receives the terminal device context release message. Wherein, after receiving the context release message of the terminal device, the terminal device can be considered to be switched completely.

Optionally, the terminal device context release message may be sent by the target access network node, and corresponds to a handover scenario based on an Xn interface.

Alternatively, the terminal device context release message may also be sent by a core network control plane node, and corresponds to a handover scenario based on an N2 interface.

As another embodiment, the first access network node is the target access network node, and the first access network node may send the second message to the first core network node and/or send the third message to the terminal device after receiving the handover complete message sent by the terminal device.

The handover complete message may correspond to the handover complete message in S508 in fig. 4, and after receiving the handover complete message, the terminal device may be considered to have established a connection with the target access network node, and may perform data transmission through the target access network node.

As still another embodiment, the first access network node may also send the second message to the first core network node when the duration of the redundant transmission performed by the at least one second core network node exceeds a sixth duration; and/or

And the first access network node sends the third message to the terminal equipment under the condition that the time length of the redundant transmission of the terminal equipment exceeds a seventh time length.

That is to say, the first access network node may also instruct the core network control plane node to trigger the core network user plane node to stop performing the redundant transmission when the time duration for performing the redundant transmission by the core network user plane node reaches a specific time duration, or the first access network node may instruct the terminal device to stop performing the redundant transmission when the time duration for performing the redundant transmission by the terminal device reaches the specific time duration.

Optionally, the sixth time duration is preconfigured, or the sixth time duration is time information of sending or receiving the duplicated data packet in first indication information, where the first indication information is sent by the first access network node to the first core network node; or

The seventh time duration is preconfigured, or the seventh time duration is time information of sending or receiving the duplicated data packet in second indication information, where the second indication information is sent to the terminal device by the first access network node.

Optionally, in some embodiments, the second message comprises at least one of:

identification information of a second access network node that stops sending or receiving the duplicated data packets, for example, which access network nodes to send or receive the duplicated data packets;

stopping the replicated transmission of the particular data stream on the particular access network node;

stopping the copying transmission of the uplink data and/or the downlink data;

time information of redundant transmission is stopped.

That is to say, the second message may be used to stop the redundant transmission of the core network user plane node, and the specific meaning may refer to the description related to stopping the redundant transmission in the foregoing embodiment, which is not described herein again.

Optionally, in some embodiments, the third message comprises at least one of:

stopping sending the copied data packet or receiving the identification information of the second access network node of the copied data packet;

stopping the copying transmission of the uplink data and/or the downlink data;

time information of redundant transmission is stopped.

Optionally, in some embodiments, the time information for canceling the redundant transmission includes:

the time point and time length information of the redundant transmission are cancelled.

That is to say, the third message may be used to stop the redundant transmission of the terminal device, and specific meanings may refer to the related description about stopping the redundant transmission in the foregoing embodiment, which is not described herein again.

While method embodiments of the present application are described in detail above with reference to fig. 2-11, apparatus embodiments of the present application are described in detail below with reference to fig. 12-19, it being understood that apparatus embodiments correspond to method embodiments and that similar descriptions may be had with reference to method embodiments.

Fig. 12 shows a schematic block diagram of a device 1200 for wireless communication according to an embodiment of the application. As shown in fig. 12, the apparatus 1200 includes:

a communication module 1210, configured to send first indication information to a first core network node, and/or send second indication information to a terminal device;

wherein the first indication information is used to trigger at least one second core network node to send or receive duplicated data packets to or from at least one terminal device through at least one access network node; or the first indication information is used for triggering at least one second core network node to send a duplicated data packet to at least one access network node or receive a duplicated data packet sent by the at least one access network node;

the second indication information is used for triggering the terminal equipment to send a duplicated data packet to at least one second core network node through at least one access network node or receive a duplicated data packet sent by at least one access network node from at least one second core network node; or the second indication information is used for triggering the terminal device to send the duplicated data packet to at least one access network node or receive the duplicated data packet sent by at least one access network node.

Optionally, the first indication information includes at least one of:

Optionally, the second indication information comprises at least one of:

Optionally, the characteristic information of the data packet that needs to be redundantly transmitted includes at least one of the following:

Optionally, the time information for transmitting the duplicated data packet includes a time point and/or a duration of time for transmitting the duplicated data packet;

Optionally, the at least one access network node includes at least one second access network node, and the communication module is specifically configured to: after the device performs handover preparation with the at least one second access network node, sending the first indication information to the first core network node and/or sending the second indication information to the terminal device.

Optionally, the at least one access network node includes at least one second access network node, and the communication module is specifically configured to: sending the first indication information to the first core network node and/or sending the second indication information to the terminal device in preparation for the device to perform handover with the at least one second access network node.

Optionally, the communication module is further configured to:

sending the first indication information to the first core network node through a handover requirement.

Optionally, the communication module is further configured to: and sending the first indication information to the first core network node through a session establishment request or a session update request.

Optionally, the communication module is further configured to: and sending the second indication information to the terminal equipment through a switching command.

Optionally, the at least one access network node comprises at least one second access network node, and the communication module is further configured to: sending the first indication information to the first core network node and/or sending the second indication information to the terminal device before the device performs handover preparation with the at least one second access network node.

Optionally, the at least one second access network node is an access network node to which the terminal device is to be accessed, and the device is an access network node to which the terminal device is currently accessed.

Optionally, the first core network node is a core network control plane node, and the second core network node is a core network user node.

Optionally, the first core network node and the second core network node are the same core network node, and the first core network node and the second core network node are core network user plane nodes or core network control plane nodes.

It should be understood that the device 1200 according to the embodiment of the present application may correspond to a terminal device in the embodiment of the method of the present application, and the above and other operations and/or functions of each unit in the device 1200 are respectively for implementing corresponding flows of the first access network node in the methods shown in fig. 2 to fig. 11, and are not described herein again for brevity.

Fig. 13 shows a schematic block diagram of a device 1300 for wireless communication according to an embodiment of the application. As shown in fig. 13, the apparatus 1300 includes:

a communication module 1310, configured to receive first indication information sent by a first access network node, where the first indication information is used to instruct the device to trigger at least one second core network node to send a duplicated data packet to at least one access network node or receive a duplicated data packet sent by the at least one access network node, or the first indication information is used to instruct the device to trigger at least one second core network node to send a duplicated data packet to at least one terminal device through the at least one access network node or receive a duplicated data packet sent from at least one terminal device through the at least one access network node; and

and sending a first message to the at least one second core network node, where the first message is used to trigger the at least one second core network node to send or receive a duplicated data packet to or from the at least one access network node, or the first message is used to trigger the at least one second core network node to send or receive a duplicated data packet to or from at least one terminal device via the at least one access network node.

Optionally, the first message includes the first indication information, and the first indication information includes at least one of:

Optionally, the at least one access network node includes at least one second access network node, and the communication module is specifically configured to:

receiving the first indication information sent by the first access network node after the first access network node performs handover preparation with the at least one second access network node.

receiving the first indication information sent by the first access network node in preparation for performing handover between the first access network node and the at least one second access network node.

Optionally, the communication module is specifically configured to:

receiving a handover requirement sent by the first access network node, wherein the handover requirement comprises the first indication information.

Optionally, the communication module is further configured to:

sending a session modification message to the at least one second core network node, the session modification message including the first indication information.

Optionally, the communication module is specifically configured to:

receiving a session establishment request or a session update request sent by the first access network node, where the session establishment request or the session update request includes the first indication information.

Optionally, the communication module is further configured to:

sending a session establishment request or a session update request to the at least one second core network node, the session establishment request or the session update request including the first indication information.

receiving first indication information sent by a first access network node before the first access network node performs handover preparation with the at least one second access network node.

Optionally, the at least one second access network node is an access network node to which the terminal device is to be accessed, and the first access network node is an access network node to which the terminal device is currently accessed.

Optionally, the apparatus further comprises:

and the determining module is used for determining the at least one second core network node for performing redundant transmission in the plurality of second core network nodes according to at least one of the auxiliary information S-NSSAI, the external network service node DNN, the subscription information of the user and the user policy of the single network slice selection of the data stream or the session corresponding to the data packet.

Optionally, when the duration of the downlink redundant transmission performed by the at least one second core network node exceeds a first duration, the at least one second core network node stops sending the duplicated data packet to some or all of the at least one access network node; or, under the condition that the time duration of the uplink redundant transmission performed by the at least one second core network node exceeds a second time duration, the at least one second core network node stops receiving the duplicated data packets sent by part or all of the at least one access network node.

Optionally, the first duration is preconfigured or obtained from the device; the second duration is preconfigured or obtained from the device.

Optionally, the communication module is further configured to:

and sending a fourth message to the at least one second core network node when the time length for the at least one second core network node to perform redundant transmission exceeds a third time length, wherein the fourth message is used for instructing the at least one second core network node to stop sending the duplicated data packets to part or all of the at least one access network node, or to stop receiving the duplicated data packets sent by part or all of the at least one access network node.

Optionally, the third duration is preconfigured or determined according to the first indication information.

Optionally, the device is a core network user plane node, and the second core network node is a core network user plane node.

Optionally, the device and the second core network node are the same core network node, and the device and the second core network node are a core network user plane node or a core network control plane node.

It should be understood that the device 1300 according to the embodiment of the present application may correspond to a terminal device in the embodiment of the method of the present application, and the above and other operations and/or functions of each unit in the device 1300 are respectively for implementing corresponding flows of the first core network node in the methods shown in fig. 2 to fig. 11, and are not described herein again for brevity.

Fig. 14 shows a schematic block diagram of a device 1400 for wireless communication according to an embodiment of the application. As shown in fig. 14, the apparatus 1400 includes:

a communication module 1410, configured to receive second indication information sent by a first access network node, where the second indication information is used to trigger the apparatus to send a duplicated data packet to at least one second core network node through at least one access network node or receive a duplicated data packet sent from at least one second core network node through the at least one access network node; or the second indication information is used for triggering the device to send the duplicated data packets to at least one access network node or receive the duplicated data packets sent by at least one access network node.

Optionally, the second indication information comprises at least one of:

the method comprises the steps of executing an indication of redundant transmission, sending an indication of a duplicated data packet to at least one access network node, receiving an indication of a duplicated data packet sent by at least one access network node, identification information of at least one access network node, a corresponding relation between at least one access network node and at least one second core network node, characteristic information of a data packet needing redundant transmission, sending time information of the duplicated data packet, receiving time information of the duplicated data packet, conducting an indication of redundant transmission between a core network and an access network, and conducting an indication of redundant transmission between the access network and equipment.

a network protocol IP address, a media access control MAC address, a port number, a data stream identifier corresponding to the packet, a session identifier, and an application identifier of the device and/or the application server.

Optionally, the communication module is specifically configured to:

and receiving a handover command sent by the first access network node, wherein the handover command comprises the second indication information.

Optionally, the communication module is further configured to:

under the condition that the time length of the equipment for carrying out uplink redundant transmission exceeds a fourth time length, stopping sending the copied data packet to part or all of the access network nodes in at least one access network node;

and under the condition that the time length of the equipment for downlink redundant transmission exceeds a fifth time length, stopping receiving the duplicated data packets sent by part or all of the access network nodes in the at least one access network node.

It should be understood that the device 1400 according to the embodiment of the present application may correspond to a terminal device in the embodiment of the method of the present application, and the above and other operations and/or functions of each unit in the device 1400 are respectively for implementing corresponding flows of the terminal device in the methods shown in fig. 2 to fig. 11, and are not described herein again for brevity.

Fig. 15 shows a schematic block diagram of a device 1500 for wireless communication according to an embodiment of the application. As shown in fig. 15, the apparatus 1500 includes:

a communication module 1510 for sending the replicated data packets to at least one second access network node.

Optionally, the communication module is further configured to:

receiving a downlink data packet sent by at least one second core network node and/or an uplink data packet sent by terminal equipment;

and generating the copied data packet according to the downlink data packet and/or the uplink data packet.

Optionally, the communication module is specifically configured to:

transmitting the duplicated data packets to the at least one second access network node if certain conditions are met.

Optionally, the specific condition comprises at least one of:

the data packet is a specific service, the Qos parameter of the data packet is a specific Qos parameter, the PDU session of the protocol data unit corresponding to the data packet is a specific PDU session, the data flow corresponding to the data packet is a specific data flow, and the indication of the first core network node.

Optionally, the second core network node is a core network user plane node.

It should be understood that the device 1500 according to the embodiment of the present application may correspond to a terminal device in the embodiment of the method of the present application, and the above and other operations and/or functions of each unit in the device 1500 are respectively for implementing corresponding flows of the first access network node in the methods shown in fig. 2 to fig. 11, and are not described herein again for brevity.

Fig. 16 shows a schematic block diagram of a device 1600 for wireless communication according to an embodiment of the application. As shown in fig. 16, the apparatus 1600 includes:

a communication module 1610 configured to send a second message to the first core network node, and/or send a third message to the terminal device,

the second message is used to instruct the first core network node to stop at least one second core network node from sending the duplicated data packets to at least one access network node and/or receive the duplicated data packets sent by the at least one access network node, and the third message is used to stop the terminal device from sending the duplicated data packets to the at least one access network node and/or receive the duplicated data packets sent by the at least one access network node.

Optionally, the communication module is specifically configured to:

and after the terminal equipment completes the switching, sending the second message to the first core network node and/or sending the third message to the terminal equipment.

Optionally, the device is the source access network node, and the communication module is specifically configured to:

and after receiving the context release message of the terminal equipment, sending the second message to the first core network node and/or sending the third message to the terminal equipment.

Optionally, the device is the target access network node, and the communication module is specifically configured to:

and after receiving a handover completion message sent by the terminal device, sending the second message to the first core network node and/or sending the third message to the terminal device.

Optionally, the communication module is specifically configured to:

sending the second message to the first core network node when the time length for the at least one second core network node to perform redundant transmission exceeds a sixth time length; and/or

And sending the third message to the terminal equipment under the condition that the time length of the redundant transmission of the terminal equipment exceeds a seventh time length.

Optionally, the sixth time duration is preconfigured, or the sixth time duration is time information of sending or receiving the duplicated data packet in first indication information, where the first indication information is sent to the first core network node by the device; or

The seventh time duration is preconfigured, or the seventh time duration is time information of sending or receiving the duplicated data packet in second indication information, where the second indication information is sent to the terminal device by the device.

Optionally, the second message comprises at least one of: stopping sending the copied data packet or receiving the identification information of the second access network node of the copied data packet; stopping the replicated transmission of the particular data stream on the particular access network node; stopping the copying transmission of the uplink data and/or the downlink data; time information of redundant transmission is stopped.

Optionally, the third message comprises at least one of: stopping sending the copied data packet or receiving the identification information of the second access network node of the copied data packet; stopping the replicated transmission of the particular data stream on the particular access network node; stopping the copying transmission of the uplink data and/or the downlink data; time information of redundant transmission is stopped.

Optionally, the time information for canceling redundant transmission includes: the time point and time length information of the redundant transmission are cancelled.

It should be understood that the device 1600 according to this embodiment may correspond to a terminal device in this embodiment of the method, and the above and other operations and/or functions of each unit in the device 1600 are respectively for implementing corresponding flows of the first access network node in the methods shown in fig. 2 to fig. 11, and are not described herein again for brevity.

Fig. 17 is a schematic structural diagram of a communication device 1700 according to an embodiment of the present application. The communication device 1700 shown in fig. 17 includes a processor 1710, and the processor 1710 can call and execute a computer program from a memory to implement the method in the embodiment of the present application.

Optionally, as shown in fig. 17, the communication device 1700 may also include a memory 1720. From the memory 1720, the processor 1710 can call and run a computer program to implement the method in the embodiment of the present application.

The memory 1720 may be a separate device from the processor 1710 or may be integrated within the processor 1710.

Optionally, as shown in fig. 17, the communication device 1700 may further include a transceiver 1730, and the processor 1710 may control the transceiver 1730 to communicate with other devices, and in particular, may transmit information or data to other devices or receive information or data transmitted by other devices.

The transceiver 1730 may include a transmitter and a receiver, among others. The transceiver 1730 may further include antennas, which may be one or more in number.

Optionally, the communication device 1700 may specifically be an access network node in the embodiment of the present application, and the communication device 1700 may implement a corresponding process implemented by the access network node in each method in the embodiment of the present application, which is not described herein again for brevity.

Optionally, the communication device 1700 may specifically be a core network node in this embodiment, and the communication device 1700 may implement a corresponding procedure implemented by the core network node in each method in this embodiment, which is not described herein again for brevity.

Optionally, the communication device 1700 may specifically be a mobile terminal/terminal device according to this embodiment, and the communication device 1700 may implement a corresponding process implemented by the mobile terminal/terminal device in each method according to this embodiment, which is not described herein again for brevity.

Fig. 18 is a schematic structural diagram of a chip of an embodiment of the present application. The chip 1800 shown in fig. 18 includes a processor 1810, and the processor 1810 can call and run a computer program from a memory to implement the method in the embodiment of the present application.

Optionally, as shown in fig. 18, chip 1800 may also include memory 1820. From the memory 1820, the processor 1810 may invoke and run a computer program to implement the methods in the embodiments of the present application.

The memory 1820 may be a separate device from the processor 1810 or may be integrated into the processor 1810.

Optionally, the chip 1800 may also include an input interface 1830. The processor 1810 may control the input interface 1830 to communicate with other devices or chips, and in particular, to obtain information or data transmitted by the other devices or chips.

Optionally, the chip 1800 may also include an output interface 1840. The processor 1810 may control the output interface 1840 to communicate with other devices or chips, and in particular, may output information or data to the other devices or chips.

Optionally, the chip may be applied to an access network node or a core network node in this embodiment, and the chip may implement a corresponding procedure implemented by the access network node or the core network node in each method in this embodiment, which is not described herein again for brevity.

Optionally, the chip may be applied to the mobile terminal/terminal device in the embodiment of the present application, and the chip may implement the corresponding process implemented by the mobile terminal/terminal device in each method in the embodiment of the present application, and for brevity, no further description is given here.

It should be understood that the chips mentioned in the embodiments of the present application may also be referred to as a system-on-chip, a system-on-chip or a system-on-chip, etc.

Fig. 19 is a schematic block diagram of a communication system 1900 provided in an embodiment of the present application. As shown in fig. 19, the communication system 1900 includes a terminal device 1910, an access network device 1920, and a core network device 1930.

The terminal device 1910 may be configured to implement the corresponding function implemented by the terminal device in the foregoing method, and the access network device 1920 may be configured to implement the corresponding function implemented by the first access network node in the foregoing method for brevity, and the core network device 1930 may be configured to implement the corresponding function implemented by the first core network node in the foregoing method for brevity, which is not described herein again for brevity.

It should be understood that the processor of the embodiments of the present application may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method embodiments may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The Processor may be a general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, or discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.

It will be appreciated that the memory in the embodiments of the subject application can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. The non-volatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash Memory. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of example, but not limitation, many forms of RAM are available, such as Static random access memory (Static RAM, SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic random access memory (Synchronous DRAM, SDRAM), Double Data Rate Synchronous Dynamic random access memory (DDR SDRAM), Enhanced Synchronous SDRAM (ESDRAM), Synchronous link SDRAM (SLDRAM), and Direct Rambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

It should be understood that the above memories are exemplary but not limiting illustrations, for example, the memories in the embodiments of the present application may also be Static Random Access Memory (SRAM), dynamic random access memory (dynamic RAM, DRAM), Synchronous Dynamic Random Access Memory (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (enhanced SDRAM, ESDRAM), Synchronous Link DRAM (SLDRAM), Direct Rambus RAM (DR RAM), and the like. That is, the memory in the embodiments of the present application is intended to comprise, without being limited to, these and any other suitable types of memory.

The embodiment of the application also provides a computer readable storage medium for storing the computer program.

Optionally, the computer-readable storage medium may be applied to the network device in the embodiment of the present application, and the computer program enables the computer to execute the corresponding process implemented by the network device in each method in the embodiment of the present application, which is not described herein again for brevity.

Optionally, the computer-readable storage medium may be applied to the mobile terminal/terminal device in the embodiment of the present application, and the computer program enables the computer to execute the corresponding process implemented by the mobile terminal/terminal device in each method in the embodiment of the present application, which is not described herein again for brevity.

Embodiments of the present application also provide a computer program product comprising computer program instructions.

Optionally, the computer program product may be applied to the network device in the embodiment of the present application, and the computer program instructions enable the computer to execute corresponding processes implemented by the network device in the methods in the embodiment of the present application, which are not described herein again for brevity.

Optionally, the computer program product may be applied to the mobile terminal/terminal device in the embodiment of the present application, and the computer program instructions enable the computer to execute the corresponding processes implemented by the mobile terminal/terminal device in the methods in the embodiment of the present application, which are not described herein again for brevity.

The embodiment of the application also provides a computer program.

Optionally, the computer program may be applied to the network device in the embodiment of the present application, and when the computer program runs on a computer, the computer is enabled to execute the corresponding process implemented by the network device in each method in the embodiment of the present application, and for brevity, details are not described here again.

Optionally, the computer program may be applied to the mobile terminal/terminal device in the embodiment of the present application, and when the computer program runs on a computer, the computer is enabled to execute the corresponding process implemented by the mobile terminal/terminal device in each method in the embodiment of the present application, which is not described herein again for brevity.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of wireless communication, comprising:

before or during or after a first access network node performs a handover preparation with at least one second access network node, the first access network node sends first indication information to a first core network node and/or sends second indication information to a terminal device;

wherein the first indication information is used to trigger at least one second core network node to send or receive duplicated data packets to or from at least one terminal device through at least one access network node; or the first indication information is used for triggering at least one second core network node to send a duplicated data packet to at least one access network node or receive a duplicated data packet sent by the at least one access network node; wherein the at least one access network node comprises the at least one second access network node;

2. The method of claim 1, wherein the first indication information comprises at least one of:

3. The method of claim 1, wherein the second indication information comprises at least one of:

4. The method according to claim 3, wherein the characteristic information of the data packet requiring redundant transmission comprises at least one of the following:

5. The method according to claim 2, wherein the time information for transmitting the duplicated data packet comprises a time point and/or a duration of time for transmitting the duplicated data packet;

6. The method of claim 1, wherein the first access network node sending first indication information to the first core network node, comprising:

and the first access network node sends the first indication information to the first core network node through a switching requirement.

7. The method of claim 1, wherein the first access network node sending first indication information to the first core network node, comprising:

and the first access network node sends the first indication information to the first core network node through a session establishment request or a session update request.

8. The method of claim 1, wherein the first access network node sends second indication information to the terminal device, comprising:

and the first access network node sends the second indication information to the terminal equipment through a switching command.

9. The method of claim 1, wherein the at least one second access network node is an access network node to which a terminal device is to be accessed, and wherein the first access network node is an access network node to which the terminal device is currently accessed.

10. The method according to any of claims 1 to 9, wherein said first core network node is a core network control plane node and said second core network node is a core network user node.

11. The method according to any of claims 1 to 9, wherein the first core network node and the second core network node are the same core network node, and wherein the first core network node and the second core network node are core network user plane nodes or core network control plane nodes.

12. A method of wireless communication, comprising:

before or during or after a first access network node and at least one second access network node perform handover preparation, the first core network node receives first indication information sent by the first access network node, where the first indication information is used to indicate that the first core network node triggers the at least one second core network node to send or receive a duplicated data packet sent by the at least one access network node to the at least one access network node, or the first indication information is used to indicate that the first core network node triggers the at least one second core network node to send or receive a duplicated data packet to or from at least one terminal device through the at least one access network node; wherein the at least one access network node comprises the at least one second access network node;

the first core network node sends a first message to the at least one second core network node, where the first message is used to trigger the at least one second core network node to send or receive a duplicated data packet to or from the at least one access network node, or the first message is used to trigger the at least one second core network node to send or receive a duplicated data packet to or from at least one terminal device through the at least one access network node.

13. The method of claim 12, wherein the first message comprises the first indication information, and wherein the first indication information comprises at least one of:

14. The method according to claim 13, wherein the characteristic information of the data packet requiring redundant transmission comprises at least one of the following:

15. The method according to claim 13, wherein the time information for transmitting the duplicated data packet comprises a time point and/or a duration of time for transmitting the duplicated data packet;

16. The method of claim 12, wherein the first core network node receiving the first indication information sent by the first access network node comprises:

and the first core network node receives a switching requirement sent by the first access network node, wherein the switching requirement comprises the first indication information.

17. The method of claim 16, wherein the first core network node sending a first message to the at least one second core network node comprises:

the first core network node sends a session modification message to the at least one second core network node, the session modification message including the first indication information.

18. The method of claim 12, wherein the first core network node receiving the first indication information sent by the first access network node comprises:

the first core network node receives a session establishment request or a session update request sent by the first access network node, where the session establishment request or the session update request includes the first indication information.

19. The method of claim 18, wherein the first core network node sending a first message to the at least one second core network node comprises:

the first core network node sends a session establishment request or a session update request to the at least one second core network node, wherein the session establishment request or the session update request comprises the first indication information.

20. The method according to any of claims 12 to 19, wherein the at least one second access network node is an access network node to which a terminal device is to be accessed, and wherein the first access network node is an access network node to which the terminal device is currently accessed.

21. The method according to any one of claims 12 to 19, further comprising:

and the first core network node determines the at least one second core network node for performing redundant transmission in a plurality of second core network nodes according to at least one of auxiliary information S-NSSAI, an external network service node DNN, subscription information of a user and a user policy of the single network slice of the data stream or the session corresponding to the data packet.

22. The method according to any of claims 12 to 19, wherein in case the duration of the downlink redundant transmission by the at least one second core network node exceeds a first duration, the at least one second core network node stops sending duplicated data packets to some or all of the at least one access network node; or, under the condition that the time duration of the uplink redundant transmission performed by the at least one second core network node exceeds a second time duration, the at least one second core network node stops receiving the duplicated data packets sent by part or all of the at least one access network node.

23. The method of claim 22, wherein the first duration is preconfigured or obtained from the first core network node; the second duration is preconfigured or obtained from the first core network node.

24. The method according to any one of claims 12 to 19, further comprising:

25. The method of claim 24, wherein the third duration is preconfigured or determined based on the first indication information.

26. The method according to any of claims 12 to 19, wherein the first core network node is a core network user plane node and the second core network node is a core network user plane node.

27. The method according to any of claims 12 to 19, wherein the first core network node and the second core network node are the same core network node, and wherein the first core network node and the second core network node are core network user plane nodes or core network control plane nodes.

28. A method of wireless communication, the method comprising:

before or during or after a first access network node and at least one second access network node perform handover preparation, a terminal device receives second indication information sent by the first access network node, wherein the second indication information is used for triggering the terminal device to send a copied data packet to at least one second core network node through at least one access network node or receive the copied data packet sent from at least one second core network node through the at least one access network node; or the second indication information is used for triggering the terminal device to send the duplicated data packet to at least one access network node or receive the duplicated data packet sent by at least one access network node.

29. The method of claim 28, wherein the second indication information comprises at least one of:

30. The method of claim 29, wherein the characteristic information of the data packet requiring redundant transmission comprises at least one of the following:

31. The method according to claim 29 or 30, wherein the time information for transmitting the duplicated data packet comprises a time point and/or a duration of time for transmitting the duplicated data packet;

32. The method of claim 28, wherein the receiving, by the terminal device, the second indication information sent by the first access network node comprises:

and the terminal equipment receives a switching command sent by the first access network node, wherein the switching command comprises the second indication information.

33. The method of claim 28, further comprising:

under the condition that the time length of uplink redundant transmission of the terminal equipment exceeds a fourth time length, the terminal equipment stops sending copied data packets to part or all of at least one access network node;

34. The method of claim 33, wherein the fourth duration is preconfigured or determined based on the second indication information; or the fifth time period is preconfigured or determined according to the second indication information.

35. The method according to claim 28, wherein the first core network node is a core network control plane node and the second core network node is a core network user node.

36. The method according to claim 28, wherein a first core network node and the second core network node are the same core network node, and wherein the first core network node and the second core network node are a core network user plane node or a core network control plane node.

37. A method of wireless communication, comprising:

before or during or after a first access network node and at least one second access network node execute a handover preparation, the first access network node receives a downlink data packet sent by at least one second core network node and/or an uplink data packet sent by terminal equipment;

generating a copied data packet according to the downlink data packet and/or the uplink data packet;

the first access network node sends the replicated data packets to the at least one second access network node.

38. The method of claim 37, wherein the first access network node sending the replicated data packets to at least one second access network node, comprising:

the first access network node sends the duplicated data packets to the at least one second access network node if certain conditions are met.

39. The method of claim 38, wherein the specific condition comprises at least one of:

40. The method according to any of claims 37 to 39, wherein said at least one second access network node is an access network node to which a terminal device is to be accessed, and wherein said first access network node is an access network node to which said terminal device is currently accessed.

41. The method of claim 37, wherein the second core network node is a core network user plane node.

42. A method of wireless communication, the method comprising:

after the terminal device performs handover, or after the first access network node receives a handover complete message sent by the terminal device, the first access network node sends a second message to the first core network node, and/or sends a third message to the terminal device,

wherein the second message is used to instruct the first core network node to stop at least one second core network node from sending and/or receiving duplicated data packets sent by the at least one access network node, and the third message is used to stop the terminal device from sending and/or receiving duplicated data packets sent by the at least one access network node; wherein the first access network node is a target access network node.

43. The method of claim 42, wherein the first access network node is a source access network node, and wherein the first access network node sends the second message to the first core network node and/or sends the third message to the terminal device, and wherein the method further comprises:

and after the first access network node receives the context release message of the terminal equipment, sending the second message to the first core network node and/or sending the third message to the terminal equipment.

44. The method of claim 42, wherein the first access network node sending the second message to the first core network node and/or sending the third message to the terminal device, comprises:

the first access network node sends the second message to the first core network node when the time length of the redundant transmission of the at least one second core network node exceeds a sixth time length; and/or

45. The method of claim 44, wherein the sixth time period is preconfigured, or wherein the sixth time period is time information for sending or receiving the duplicated data packet in first indication information sent by the first access network node to the first core network node; or

46. The method according to any of claims 42 to 45, wherein the second message comprises at least one of: stopping sending the copied data packet or receiving the identification information of the second access network node of the copied data packet;

stopping the copying transmission of the uplink data and/or the downlink data;

time information of redundant transmission is stopped.

47. The method of any of claims 42 to 45, wherein the third message comprises at least one of: stopping sending the copied data packet or receiving the identification information of the second access network node of the copied data packet;

stopping the copying transmission of the uplink data and/or the downlink data;

time information of redundant transmission is stopped.

48. The method of claim 46, wherein the time information for stopping redundant transmission comprises:

time point and time length information of stopping redundant transmission.

49. The method according to any of claims 42 to 45, wherein said first core network node is a core network control plane node and said second core network node is a core network user node.

50. An apparatus for wireless communication, comprising:

a communication module, configured to send first indication information to a first core network node and/or send second indication information to a terminal device before the device performs a handover preparation with at least one second access network node, or during the device performs the handover preparation with the at least one second access network node, or after the device performs the handover preparation with the at least one second access network node;

51. The apparatus of claim 50, wherein the first indication information comprises at least one of:

52. The apparatus of claim 50, wherein the second indication information comprises at least one of:

53. The apparatus according to claim 51, wherein the characteristic information of the data packet requiring redundant transmission comprises at least one of the following items:

54. The apparatus according to any one of claims 51 to 53, wherein the time information for transmitting the duplicated data packet includes a time point and/or a time length of duration for transmitting the duplicated data packet;

55. The device of claim 50, wherein the communication module is further configured to:

56. The device of claim 50, wherein the communication module is further configured to:

and sending the first indication information to the first core network node through a session establishment request or a session update request.

57. The device of claim 50, wherein the communication module is further configured to:

and sending the second indication information to the terminal equipment through a switching command.

58. The apparatus of claim 50, wherein the at least one second access network node is an access network node to which a terminal device is to be accessed, and wherein the apparatus is an access network node to which the terminal device is currently accessed.

59. The apparatus according to claim 50, wherein the first core network node is a core network control plane node and the second core network node is a core network user node.

60. The apparatus according to claim 50, wherein the first core network node and the second core network node are the same core network node, and wherein the first core network node and the second core network node are core network user plane nodes or core network control plane nodes.

61. An apparatus for wireless communication, comprising:

a communication module, configured to receive first indication information sent by a first access network node after the first access network node performs handover preparation with at least one second access network node, or during handover preparation between the first access network node and the at least one second access network node, or before handover preparation between the first access network node and the at least one second access network node is performed, where the first indication information is used to instruct the device to trigger at least one second core network node to send a duplicated data packet to at least one access network node or receive a duplicated data packet sent by the at least one access network node, or the first indication information is used to instruct the device to trigger at least one second core network node to send a duplicated data packet to at least one terminal device through the at least one access network node or receive a duplicated number sent by the at least one terminal device through the at least one access network node A packet; and

sending a first message to the at least one second core network node, the first message being used to trigger the at least one second core network node to send or receive duplicated data packets to or from the at least one access network node, or the first message being used to trigger the at least one second core network node to send or receive duplicated data packets to or from at least one terminal device via the at least one access network node; wherein the at least one access network node comprises the at least one second access network node.

62. The apparatus of claim 61, wherein the first message comprises the first indication information, wherein the first indication information comprises at least one of:

63. The apparatus according to claim 62, wherein the characteristic information of the data packet requiring redundant transmission comprises at least one of the following:

64. The apparatus according to claim 62, wherein the time information for transmitting the duplicated data packet comprises a time point and/or a duration of time for transmitting the duplicated data packet;

65. The device of claim 61, wherein the communication module is specifically configured to: receiving a handover requirement sent by the first access network node, wherein the handover requirement comprises the first indication information.

66. The device of claim 61, wherein the communication module is further configured to:

67. The device of claim 61, wherein the communication module is specifically configured to: receiving a session establishment request or a session update request sent by the first access network node, where the session establishment request or the session update request includes the first indication information.

68. The device of claim 67, wherein the communication module is further configured to:

69. The apparatus according to any of claims 61 to 68, wherein the at least one second access network node is an access network node to which a terminal device is to be accessed, and the first access network node is an access network node to which the terminal device is currently accessed.

70. The apparatus of any one of claims 61 to 68, further comprising:

71. The apparatus as claimed in any one of claims 61 to 68, wherein in case the duration of the downlink redundant transmission by the at least one second core network node exceeds a first duration, the at least one second core network node stops sending duplicated data packets to some or all of the at least one access network node; or, under the condition that the time duration of the uplink redundant transmission performed by the at least one second core network node exceeds a second time duration, the at least one second core network node stops receiving the duplicated data packets sent by part or all of the at least one access network node.

72. The device of claim 71, wherein the first duration is preconfigured or obtained from the device; the second duration is preconfigured or obtained from the device.

73. The device of any one of claims 61-68, wherein the communication module is further configured to:

74. The apparatus of claim 73, wherein the third duration is preconfigured or determined based on the first indication information.

75. The apparatus according to any of claims 61-68, wherein the apparatus is a core network user plane node and the second core network node is a core network user plane node.

76. The apparatus according to any of claims 61-68, wherein the apparatus and the second core network node are the same core network node, and wherein the apparatus and the second core network node are a core network user plane node or a core network control plane node.

77. An apparatus for wireless communication, comprising:

a communication module, configured to receive second indication information sent by a first access network node before or during or after a handover preparation is performed between the first access network node and at least one second access network node, where the second indication information is used to trigger the device to send a duplicated data packet to the at least one second core network node through the at least one access network node or receive a duplicated data packet from the at least one second core network node through the at least one access network node; or the second indication information is used for triggering the device to send the duplicated data packets to at least one access network node or receive the duplicated data packets sent by at least one access network node.

78. The apparatus according to claim 77, wherein the second indication information comprises at least one of:

79. The apparatus according to claim 78, wherein the characteristic information of the data packet requiring redundant transmission comprises at least one of: a network protocol IP address, a media access control MAC address, a port number, a data stream identifier corresponding to the packet, a session identifier, and an application identifier of the device and/or the application server.

80. The apparatus according to claim 78, wherein the time information for transmitting the duplicated data packet comprises a time point and/or a duration of time for transmitting the duplicated data packet;

81. The device according to any one of claims 77 to 80, wherein the communication module is specifically configured to:

82. The device of any one of claims 77-80, wherein the communication module is further configured to:

83. The device of claim 82, wherein the fourth duration is preconfigured or determined based on the second indication information; or the fifth time period is preconfigured or determined according to the second indication information.

84. The apparatus according to any of claims 77-80, wherein a first core network node is a core network control plane node and the second core network node is a core network user node.

85. The apparatus according to any of claims 77-80, wherein a first core network node and the second core network node are the same core network node, and wherein the first core network node and the second core network node are core network user plane nodes or core network control plane nodes.

86. An apparatus for wireless communication, comprising:

a communication module, configured to receive a downlink data packet sent by at least one second core network node and/or an uplink data packet sent by a terminal device before a first access network node and at least one second access network node perform a handover preparation, or during or after the handover preparation is performed; generating a copied data packet according to the downlink data packet and/or the uplink data packet; the replicated data packets are sent to at least one second access network node.

87. The device of claim 86, wherein the communication module is specifically configured to:

88. The apparatus according to claim 87, wherein the specific condition comprises at least one of:

89. The apparatus according to any of claims 86 to 88, wherein said at least one second access network node is an access network node to which a terminal device is to be accessed, and wherein said apparatus is an access network node to which said terminal device is currently accessed.

90. The apparatus of claim 86, wherein the second core network node is a core network user plane node.

91. An apparatus for wireless communication, comprising:

a communication module, configured to send a second message to the first core network node and/or send a third message to the terminal device after the terminal device performs handover or after the first access network node receives a handover complete message sent by the terminal device,

92. The device according to claim 91, wherein the device is a source access network node, and the communication module is specifically configured to:

93. The device of claim 91, wherein the communication module is specifically configured to:

sending the second message to the first core network node when the time length for the at least one second core network node to perform redundant transmission exceeds a sixth time length; and/or sending the third message to the terminal equipment under the condition that the time length of the redundant transmission of the terminal equipment exceeds a seventh time length.

94. The apparatus of claim 93, wherein the sixth duration is preconfigured, or wherein the sixth duration is time information of sending or receiving the duplicated data packet in first indication information sent by the apparatus to the first core network node; or

95. The device of any one of claims 91 to 94, wherein the second message comprises at least one of: stopping sending the copied data packet or receiving the identification information of the second access network node of the copied data packet;

stopping the replicated transmission of the particular data stream on the particular access network node; stopping the copying transmission of the uplink data and/or the downlink data; time information of redundant transmission is stopped.

96. The apparatus of any of claims 91-94, wherein the third message comprises at least one of: stopping sending the copied data packet or receiving the identification information of the second access network node of the copied data packet;

stopping the replicated transmission of the particular data stream on the particular access network node; stopping the copying transmission of the uplink data and/or the downlink data;

time information of redundant transmission is stopped.

97. The apparatus according to claim 95, wherein the time information for stopping redundant transmission comprises:

time point and time length information of stopping redundant transmission.

98. The apparatus according to any of claims 91-94, wherein the first core network node is a core network control plane node and the second core network node is a core network user node.

99. An apparatus for wireless communication, comprising: a processor and a memory for storing a computer program, the processor being configured to invoke and execute the computer program stored in the memory, to perform the method of any of claims 1 to 11, or the method of any of claims 12 to 27, or the method of any of claims 28 to 36, or the method of any of claims 37 to 41, or the method of any of claims 42 to 49.

100. A chip, comprising: a processor for calling and running a computer program from a memory so that a device on which the chip is installed performs a method according to any one of claims 1 to 11, or a method according to any one of claims 12 to 27, or a method according to any one of claims 28 to 36, or a method according to any one of claims 37 to 41, or a method according to any one of claims 42 to 49.

101. A computer-readable storage medium for storing a computer program which causes a computer to perform the method of any one of claims 1 to 11, or the method of any one of claims 12 to 27, or the method of any one of claims 28 to 36, or the method of any one of claims 37 to 41, or the method of any one of claims 42 to 49.