WO2021160057A1 - 系统间切换方法和通信装置 - Google Patents

系统间切换方法和通信装置 Download PDF

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Publication number
WO2021160057A1
WO2021160057A1 PCT/CN2021/075718 CN2021075718W WO2021160057A1 WO 2021160057 A1 WO2021160057 A1 WO 2021160057A1 CN 2021075718 W CN2021075718 W CN 2021075718W WO 2021160057 A1 WO2021160057 A1 WO 2021160057A1
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Prior art keywords
access network
network device
terminal device
identifier
core network
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PCT/CN2021/075718
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English (en)
French (fr)
Inventor
胡星星
张宏平
彭文杰
Original Assignee
华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP21754546.6A priority Critical patent/EP4099796A4/en
Priority to JP2022549181A priority patent/JP2023513809A/ja
Priority to KR1020227030537A priority patent/KR20220137711A/ko
Priority to BR112022016019A priority patent/BR112022016019A2/pt
Publication of WO2021160057A1 publication Critical patent/WO2021160057A1/zh
Priority to US17/819,398 priority patent/US20220386186A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0027—Control or signalling for completing the hand-off for data sessions of end-to-end connection for a plurality of data sessions of end-to-end connections, e.g. multi-call or multi-bearer end-to-end data connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0066—Transmission or use of information for re-establishing the radio link of control information between different types of networks in order to establish a new radio link in the target network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H04W36/00698—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using different RATs
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00835—Determination of neighbour cell lists
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/38—Reselection control by fixed network equipment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H04W76/16—Involving different core network technologies, e.g. a packet-switched [PS] bearer in combination with a circuit-switched [CS] bearer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H04W36/144—Reselecting a network or an air interface over a different radio air interface technology

Definitions

  • This application relates to the field of communication, and more specifically, to an inter-system handover method and communication device.
  • one terminal device may communicate with multiple access network devices, that is, multi-radio dual connectivity (MR-DC).
  • Dual connectivity includes multiple types, such as evolved universal terrestrial radio access (E-UTRA) and dual connectivity composed of new wireless (E-UTRA-NR dual connectivity, EN-DC).
  • E-UTRA evolved universal terrestrial radio access
  • EN-DC new wireless
  • the terminal can perform inter-system handover, for example, from connecting to the 5th generation (5G) core network (5G core, 5GC) through accessing the new radio access technology (NR) base station to switching through the access Long term evolution (LTE) base stations are connected to the 4th generation (4G) core network.
  • 5G 5th generation
  • 5G core 5G core
  • 5GC new radio access technology
  • LTE Long term evolution
  • some data packets sent by the source core network to the source access network device are transferred to the target access network device in the target system.
  • the source access network device first transfers the data packet to the source core network of the source system, the source core network is then transferred to the target core network of the target system, and the target core network is then transferred to the target access network device.
  • the source access network device directly transfers the data packet to the target access network device. After the data packet is transferred to the target access network device, the target access network device sends the data packet to the terminal device.
  • the target access network device can configure MR-DC for the terminal device.
  • how to perform data transfer has become a technical problem to be solved urgently.
  • This application provides an inter-system handover method and communication device, which can avoid transferring data corresponding to the bearer terminating in the source access network device when the target secondary access network device is the source access network device. Delay caused by data transfer.
  • an inter-system handover method includes: a first access network device receives a handover request message from a first core network device, where the handover request message includes an identifier of the terminal device, and the first access network device The device provides a service for the terminal device to connect to the first core network, the first core network device belongs to the first core network; the first access network device determines that the auxiliary access network device added for the terminal device is the second access network device , The second access network device provides the terminal device with a service connected to the second core network; the first access network device sends an auxiliary access network device addition request message to the second access network device, and the auxiliary access network device The increase request message includes the identification of the terminal device.
  • the identifier of the terminal device is a cell radio network temporary identifier (C-RNTI) assigned by the terminal device to the terminal device in the serving cell of the second access network device, or the terminal device’s
  • C-RNTI cell radio network temporary identifier
  • the identifier is the identifier of the terminal device in the interface between the second access network device and the second core network device.
  • the second core network device belongs to the second core network.
  • the identifier of the terminal device in the interface between the second access network device and the second core network device may be allocated by the second access network device or may be allocated by the second core network device.
  • the second access network device can provide the first access network device with the identification of the terminal device that will perform the handover process during the handover process, and the first access network device determines that the secondary access network device is connected to the
  • the source access network device ie, the second access network device
  • the source access network device pair can be terminated at the source access network device.
  • the data corresponding to the bearer of the access network device does not undergo data transfer, so that the data transmission delay can be reduced.
  • the handover request message may further include the identifier of the second access network device.
  • the first access network device may determine, according to the identifier of the second access network device, that the secondary access network device added for the terminal device is the second access network device.
  • the identifier of the second access network device is an identifier when the second access network device provides the terminal device with a service connected to the first core network.
  • the content constituting the identity of the second access network device may include one or more of the following:
  • PCI core network identifier
  • the terminal device is in the PCI of the serving cell of the second access network device
  • the second access network device is the terminal
  • the terminal device is at the frequency point of the serving cell of the second access network device
  • the second access network device provides the terminal device with the service connected to the first core network
  • the terminal device The cell global identifier (CGI) of the serving cell of the device in the second access network device.
  • CGI cell global identifier
  • the identifier of the second access network device is an identifier when the second access network device provides the terminal device with a service connected to the second core network.
  • the content constituting the identity of the second access network device may include one or more of the following:
  • the second access network device provides the terminal device with the service of connecting to the second core network, the PCI and the second access of the cell managed by the second access network device
  • the network device provides the terminal device with the service of connecting to the second core network
  • the terminal device is in the PCI of the serving cell of the second access network device
  • the second access network device provides the terminal device with the connection to the second core network.
  • the terminal device is at the frequency point of the serving cell of the second access network device.
  • the terminal device is in the second access network device's service. CGI of the serving cell.
  • the identification when the second access network device provides the terminal device with the service connected to the first core network and the identification when the second access network device provides the terminal device with the service connected to the second core network may be The same can be different.
  • the method may further include: The network access device receives the first mapping relationship from the second access network device, where the first mapping relationship is the identifier and the second access when the second access network device provides the terminal device with a service connected to the first core network.
  • the network access device provides the terminal device with the mapping relationship between the identifiers when connecting to the second core network service; wherein, the first access network device determines that the auxiliary access network device added for the terminal device is the second access network device.
  • the network device includes: the first access network device determines that the auxiliary access network device added for the terminal device is the second access network device according to the identifier of the second access network device and the first mapping relationship.
  • an inter-system handover method includes: a second access network device sends a first message to a second core network device, the first message includes an identifier of the terminal device, and the second access network device is The terminal device provides services connected to the second core network, the first message is used to request the first access network device to allocate resources for the terminal device, and the first access network device provides the terminal device with access to the first core network Service; the second access network device receives the auxiliary access network device addition request message from the first access network device, the first access network device is the primary access network device of the terminal device, and the auxiliary access network device addition request The message includes the identifier of the terminal device, and the auxiliary access network device addition request message is used to request to add the second access network device as the auxiliary access network device of the terminal device.
  • the second core network equipment belongs to the second core network.
  • the identity of the terminal device is the C-RNTI allocated by the terminal device in the serving cell of the second access network device for the terminal device, or the identity of the terminal device is that the terminal device is in the second access network device The identifier in the interface with the second core network device.
  • the identifier of the terminal device in the interface between the second access network device and the second core network device may be allocated by the second access network device or may be allocated by the second core network device.
  • the second access network device After the second access network device receives the auxiliary access network device addition request message, if it is determined according to the identification of the terminal device that the terminal device is the terminal device that the auxiliary access network device is serving (or before handover), Then, the transfer of data corresponding to the bearer terminating in the second access network device can be ignored. That is to say, for the data corresponding to the bearer that terminates in the second access network device, the second access network device does not need to send to the second core network first, and then transfer the data from the second core network to the first core network. A core network is sent to the second access network device.
  • the bearer terminating at the second access network device may include the secondary cell group (SCG) bearer terminating at the second access network device, the separated bearer terminating at the second access network device, and the separate bearer terminating at the second access network device.
  • SCG secondary cell group
  • MCG master cell group
  • the second access network device can provide the first access network device with the identification of the terminal device that will perform the handover process during the handover process, and the first access network device determines the secondary access network
  • the device and the source access network device ie, the second access network device
  • the source access network device pair can be terminated
  • the data corresponding to the bearer of the source access network device does not undergo data transfer, so that the data transmission delay can be reduced.
  • the first message may further include the identifier of the second access network device.
  • the identifier of the second access network device is an identifier when the second access network device provides the terminal device with a service connected to the first core network.
  • the identifier of the second access network device is an identifier when the second access network device provides the terminal device with a service connected to the second core network.
  • the method may further include:
  • the second access network device sends the first mapping relationship to the first access network device, where the first mapping relationship is the identifier and the second access when the second access network device provides the terminal device with a service connected to the first core network.
  • the network access device provides a mapping relationship between the identifiers when the terminal device is connected to the second core network service.
  • the first access network device when the first access network device receives the identifier when the second access network device provides the terminal device with a service connected to the second core network, the first access network device can determine the secondary network device according to the first mapping relationship. Whether the access network device is a second access network device.
  • the method may further include: the second access network device sends to the first access network device data corresponding to the bearer terminated in the first access network device.
  • these data include data already received by the second access network device from the second core network or/and data subsequently received from the second core network.
  • the second access network device can directly send these data to the first access network device, or first to the second core network, and then from the second core network to the first core network, and then the first core network to the The first access network device.
  • the method may further include: the second access network device according to the quality of service (QoS) flow and the radio of the evolved universal terrestrial radio access network
  • QoS quality of service
  • the mapping relationship between the E-UTRAN radio access bearer (E-RAB) is to map the data packet of the QoS flow received from the second core network to the data radio bearer (data radio bearer) corresponding to the E-RAB after the handover. radio bearer, DRB).
  • the method may further include: the second access network device uses the key before the handover to communicate with the terminal device, and uses the key after the handover (ie As the key of the auxiliary access network device), it performs data communication with the terminal device.
  • an inter-system handover method includes: a second core network device receives a first message from a second access network device; The device sends a redirect request message.
  • the first message includes the identification of the terminal device, and the first message is used to request the first access network device to allocate resources for the terminal device.
  • the redirection request message includes the identification of the terminal device.
  • the second access network device provides the terminal device with a service connected to the second core network, and the first access network device provides the terminal device with a service connected to the first core network.
  • the second core network device belongs to the second core network, and the first core network device belongs to the first core network.
  • the second core network device may send the identification of the terminal device to the first access network device through the first core network device.
  • the second access network device can provide the first access network device with the identification of the terminal device that will perform the handover process through the first core network device and the second core network device during the handover process.
  • the first access network device determines that the secondary access network device and the source access network device (ie, the second access network device) are the same access network device, by providing the terminal to the source access network device
  • the identification of the device can make the source access network device not perform data transfer to the data corresponding to the bearer terminated at the source access network device, thereby reducing the data transmission delay.
  • the redirection request message may include the identifier of the second access network device.
  • an inter-system handover method includes: a first core network device receives a redirection request message from a second core network device, the redirection request message includes an identifier of the terminal device, and the second core network device receives a redirection request message.
  • the network access device provides the terminal device with the service of connecting to the second core network
  • the first access network device provides the terminal device with the service of connecting to the first core network
  • the first core network device sends the service to the first access network device A handover request message, where the handover request message includes the identification of the terminal device.
  • the second core network device belongs to the second core network, and the first core network device belongs to the first core network.
  • the second access network device can provide the first access network device with the identification of the terminal device that will perform the handover process through the first core network device and the second core network device during the handover process.
  • the first access network device determines that the secondary access network device and the source access network device (ie, the second access network device) are the same access network device, by providing the terminal to the source access network device
  • the identification of the device can make the source access network device not perform data transfer to the data corresponding to the bearer terminated at the source access network device, thereby reducing the data transmission delay.
  • the redirection request message may include the identifier of the second access network device.
  • the handover request message may include the identifier of the second access network device.
  • a communication device which includes various modules or units for executing the method in the first aspect or the second aspect and any one of the first aspect or the second aspect.
  • a communication device including a processor.
  • the processor is coupled with the memory and can be used to execute instructions in the memory to implement the method in any one of the foregoing first aspect or second aspect and any one of the first aspect or the second aspect.
  • the communication device further includes a memory.
  • the communication device further includes a communication interface, and the processor is coupled with the communication interface.
  • the communication interface is a transceiver, or an input/output interface.
  • the transceiver may be a transceiver circuit.
  • the input/output interface may be an input/output circuit.
  • a communication device which includes various modules or units for executing the method in the third aspect or the fourth aspect and any one of the third aspect or the fourth aspect.
  • a communication device including a processor.
  • the processor is coupled with the memory and can be used to execute instructions in the memory to implement the method in any one of the foregoing third aspect or fourth aspect and the third aspect or fourth aspect.
  • the communication device further includes a memory.
  • the communication device further includes a communication interface, and the processor is coupled with the communication interface.
  • the communication interface is a transceiver, or an input/output interface.
  • the transceiver may be a transceiver circuit.
  • the input/output interface may be an input/output circuit.
  • a processor including: an input circuit, an output circuit, and a processing circuit.
  • the processing circuit is used to receive a signal through the input circuit and transmit a signal through the output circuit, so that the processor executes the method in any one of the first aspect to the fourth aspect and any one of the first aspect to the fourth aspect.
  • the above-mentioned processor may be a chip, the input circuit may be an input pin, the output circuit may be an output pin, and the processing circuit may be a transistor, a gate circuit, a flip-flop, and various logic circuits.
  • the input signal received by the input circuit may be received and input by, for example, but not limited to, a receiver, and the signal output by the output circuit may be, for example, but not limited to, output to the transmitter and transmitted by the transmitter, and the input circuit and output
  • the circuit can be the same circuit, which is used as an input circuit and an output circuit at different times.
  • the embodiments of the present application do not limit the specific implementation manners of the processor and various circuits.
  • a processing device including a processor and a memory.
  • the processor is used to read instructions stored in the memory, receive signals through a receiver, and transmit signals through a transmitter to execute any one of the first aspect to the fourth aspect and any one of the first aspect to the fourth aspect.
  • processors there are one or more processors and one or more memories.
  • the memory may be integrated with the processor, or the memory and the processor may be provided separately.
  • the memory can be a non-transitory (non-transitory) memory, such as a read only memory (ROM), which can be integrated with the processor on the same chip, or can be set in different On the chip, the embodiment of the present application does not limit the type of the memory and the setting mode of the memory and the processor.
  • ROM read only memory
  • the relevant information interaction process may be a process of outputting information from the processor, and receiving information may be a process of receiving information by the processor.
  • the information output by the processing may be output to the transmitter, and the input information received by the processor may come from the receiver.
  • the transmitter and receiver can be collectively referred to as a transceiver.
  • the processing device in the above tenth aspect may be a chip, and the processor may be implemented by hardware or software.
  • the processor When implemented by hardware, the processor may be a logic circuit, an integrated circuit, etc.; when implemented by software, When implemented, the processor may be a general-purpose processor, which is implemented by reading software codes stored in the memory.
  • the memory may be integrated in the processor, may be located outside the processor, and exist independently.
  • a computer program product includes: a computer program (also called code, or instruction), when the computer program is executed, the computer executes the first to fourth aspects. Aspect and the method in any one of the possible implementation manners of the first aspect to the fourth aspect.
  • a computer-readable medium stores a computer program (also called code, or instruction) when it runs on a computer, so that the computer executes the first aspect to the first aspect.
  • a computer program also called code, or instruction
  • the four aspects and the method in any one of the possible implementation manners of the first aspect to the fourth aspect.
  • a communication system including at least two of the aforementioned first access network equipment, second access network equipment, first core network equipment, and second core network equipment.
  • Figure 1 is a schematic diagram of a user plane protocol stack.
  • Figure 2 is a schematic diagram of a protocol stack for MCG bearer, SCG bearer and separate bearer.
  • Fig. 3 is a schematic diagram of the system architecture applied to the present application.
  • Fig. 4 is an exemplary flowchart of the inter-system handover method provided by the present application.
  • Fig. 5 is a schematic block diagram of a communication device provided by the present application.
  • Fig. 6 is a schematic diagram of the structure of the access network device provided by the present application.
  • Fig. 7 is a schematic structural diagram of another communication device provided by the present application.
  • one terminal device may communicate with multiple access network devices, that is, the terminal device may perform dual connectivity (DC) communication.
  • DC dual connectivity
  • the standard or radio access technology (radio access technology, RAT) of the primary access network device and the secondary access network device may be the same or different.
  • Multi-radio dual connectivity is a type of DC.
  • the access network equipment in MR-DC includes primary access network equipment and secondary access network equipment that adopt different or the same RAT.
  • the primary access network device is the access network device that interacts with the core network in control plane signaling in the MR-DC, and the other access network devices in the MR-DC are the auxiliary access network devices.
  • the primary access network device is also called a master node (master node, MN), and the secondary access network device is also called a secondary node (secondary node, SN).
  • MR-DC includes multiple types, for example, evolved universal terrestrial radio access (E-UTRA) and dual connectivity (E-UTRA-NR dual connectivity, EN-DC) composed of new wireless, Next generation radio access network (NG-RAN) evolved universal land-based radio access and dual connectivity (NG-RAN E-UTRA-NR dual connectivity, NGEN-DC), new radio Dual connectivity (NR-E-UTRA dual connectivity, NE-DC) composed of wireless and evolved universal land-based wireless access, and dual connectivity (NR-NR dual connectivity, NR-DC) composed of new wireless and new wireless.
  • E-UTRA evolved universal terrestrial radio access
  • EN-DC evolved universal terrestrial radio access
  • NG-RAN Next generation radio access network evolved universal land-based radio access and dual connectivity
  • NE-DC new radio Dual connectivity
  • NR-NR dual connectivity, NR-DC dual connectivity
  • NR-NR dual connectivity, NR-DC composed of new wireless and new wireless.
  • the main access network equipment and the auxiliary access network equipment in the EN-DC provide terminal equipment with services to connect to the 4th generation (4G) core network.
  • the 4G core network can be called an evolved packet core network (evolved packet core network). packet core, EPC).
  • the primary access network equipment is a long term evolution (LTE) access network equipment, also known as an Evolution Node B (eNB), and the secondary access network equipment is an NR access network equipment, also known as gNB.
  • LTE long term evolution
  • eNB Evolution Node B
  • NR access network equipment also known as gNB.
  • EN-DC is sometimes called non-standalone (NSA) networking.
  • SA standalone
  • SA standalone
  • the primary access network equipment and the secondary access network equipment provide terminal equipment with a service to connect to the fifth generation (5th generation, 5G) core network (5G core, 5GC).
  • the main access network device is an LTE access network device
  • the auxiliary access network device is an NR access network device.
  • the main access network equipment and the auxiliary access network equipment in the NE-DC provide terminal equipment with a service to connect to the 5GC.
  • the main access network device is an NR access network device
  • the auxiliary access network device is an LTE access network device.
  • the main access network equipment and the auxiliary access network equipment provide terminal equipment with a service to connect to the 5GC.
  • the primary access network equipment and the secondary access network equipment are both NR access network equipment.
  • the access network device provides the terminal device with a service connected to the EPC means that the data plane transmission between the terminal device and the EPC is transmitted through the access network device.
  • the access network device provides the terminal device with a service connected to the 5GC means that the data plane transmission between the terminal device and the 5GC is transmitted through the access network device.
  • the eNB when the eNB provides the service of connecting to the 5GC for the UE, the eNB is also called ng-eNB.
  • the gNB When the gNB provides the service of connecting to the EPC for the UE, the gNB is also called en-gNB.
  • RLC radio link control
  • MAC medium access control
  • Data radio bearer (DRB) in MR-DC is divided into primary cell group (master cell group, MCG) bearer (bearer), secondary cell group (secondary cell group, SCG) bearer, and split (split) bearer.
  • MCG bearer means that the RLC/MAC entity of the DRB is only on the primary access network device; SCG bearer means that the RLC/MAC entity of the DRB is only on the secondary access network device; separate bearer refers to the RLC of the DRB
  • the /MAC entity is available on both the primary access network equipment and the secondary access network equipment.
  • packet data convergence protocol packet data convergence protocol, PDCP
  • the downlink data from the core network directly reaches the main access network device, is processed by the PDCP/service data adaptation protocol (SDAP) of the main access network device, and then sent to the terminal via RLC/MAC Device:
  • SDAP service data adaptation protocol
  • the uplink data is processed by the PDCP/SDAP of the main access network device and sent to the core network.
  • the PDCP terminated bearer on the secondary access network device is called an SN terminated bearer.
  • the downlink data from the core network directly reaches the secondary access network equipment, and is processed by the secondary access network equipment through PDCP/SDAP and then sent to the terminal equipment department through RLC/MAC; the uplink data is sent from the secondary access network equipment to the terminal equipment department.
  • PDCP/SDAP is processed and sent to the core network.
  • Figure 1 shows the user plane protocol stack of the EN-DC on the network side and the user plane protocol stack of the MR-DC connected to the 5GC. It should be understood that the transmission of each bearer needs to go through RLC/MAC and PDCP/SDAP.
  • FIG. 2 shows a schematic diagram of a protocol stack of MCG bearer, SCG bearer, and separate bearer on the network side in NGEN-DC/NE-DC/NR-DC.
  • the solution of this application is suitable for switching between systems from non-MR-DC (non-MR-DC) to MR-DC.
  • the terminal device accesses the core network through only one access network device.
  • the terminal device accesses the core network through the DC mode, and the core network before and after the handover is different, for example, one is EPC, one is 5GC.
  • Fig. 3 is a schematic diagram of a communication scenario applicable to the present application.
  • the scenario shown in Figure 3 is an inter-system handover from NR to EN-DC.
  • gNB before handover, gNB provides UE with a service to connect to 5GC.
  • the gNB and the eNB provide services for the UE in a DC manner, where the eNB is the primary access network equipment of the UE, and the gNB is the secondary access network equipment of the UE.
  • the gNB and the eNB provide the UE with the service of connecting to the EPC.
  • the access network device in this application is a device deployed in a wireless access network to provide a wireless communication function for terminal devices.
  • the access network equipment in the 4G network includes but is not limited to: evolved Node B (eNB), Radio Network Controller (RNC), Node B (Node B) B, NB), base station controller (Base Station Controller, BSC), base transceiver station (Base Transceiver Station, BTS), home base station (for example, Home evolved NodeB, or Home Node B, HNB), baseband unit (BaseBand Unit, BBU), the access point (AP), wireless relay node, wireless backhaul node, transmission point (TP), or transmission and reception point in a wireless fidelity (Wireless Fidelity, WIFI) system reception point, TRP), etc.
  • eNB evolved Node B
  • RNC Radio Network Controller
  • Node B Node B
  • BSC Base Station Controller
  • BTS base transceiver station
  • BTS home base station
  • Base station for example, Home evolved Node
  • the access network equipment in the 5G network includes but is not limited to: gNB, transmission point (TRP or TP), one or a group of base stations in the 5G system (including multiple antenna panels) Antenna panel.
  • the access network equipment in the 5G network can also be a network node that constitutes a gNB or transmission point, such as a baseband unit (BBU), or a distributed unit (DU), cloud radio access network (cloud radio access).
  • BBU baseband unit
  • DU distributed unit
  • cloud radio access network cloud radio access
  • network CRAN wireless controllers, wearable devices, or vehicle-mounted devices in the scenario.
  • the gNB may include a centralized unit (CU) and a DU.
  • the gNB may also include a radio unit (RU).
  • CU implements some functions of gNB
  • DU implements some functions of gNB, for example, CU implements radio resource control (radio resource control, RRC), packet data convergence protocol (packet data convergence protocol, PDCP) layer functions
  • RRC radio resource control
  • PDCP packet data convergence protocol
  • DU implements wireless link Functions of the radio link control (RLC) layer, media access control (MAC) layer, and physical (PHY) layer.
  • RLC radio link control
  • MAC media access control
  • PHY physical
  • the network device may be a CU node, or a DU node, or a device including a CU node and a DU node.
  • a CU can be divided into network equipment in an access network (radio access network, RAN), or a CU can be divided into network equipment in a core network (core network, CN), which is not limited in this application.
  • control plane device in the EPC may be a mobility management entity (mobility management entity, MME), or may also be an entity with MME functions.
  • MME mobility management entity
  • the control plane device in the 5GC may be an access and mobility management function (AMF), or may also be an entity with AMF function.
  • AMF access and mobility management function
  • the terminal equipment in this application may also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile equipment, user terminal , Terminal, wireless communication equipment, user agent or user device.
  • the terminal device in the embodiment of the present application may be a mobile phone (mobile phone), a tablet computer (pad), a computer with a wireless transceiver function, a virtual reality (VR) terminal device, and an augmented reality (AR) terminal Equipment, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical, wireless terminals in smart grid, transportation safety ( Wireless terminals in transportation safety, wireless terminals in smart cities, and wireless terminals in smart homes.
  • this application provides an inter-system handover method.
  • the solution of the present application will be described below.
  • the second access network device Before the terminal device is switched, the second access network device provides a service for the terminal device to connect to the second core network. After the terminal device is switched, the second access network device provides the terminal device with a service connected to the first core network, and the first access network device provides the terminal device with a service connected to the first core network.
  • the first core network device is a control plane device in the first core network
  • the second core network device is a control plane device in the second core network.
  • the first core network may be EPC
  • the second core network may be 5GC
  • the first access network device, the second access network device, the first core network device, and the second core network device may respectively correspond to the eNB, gNB, and EPC in the scenario shown in FIG. 3
  • the second core network may be EPC, and the first core network may be 5GC.
  • the first core network may be a 5GC, and the second core network may be a future 6G core network.
  • the first core network device and the second core network device may be completely different, or some functions may be the same.
  • FIG. 3 is only an exemplary scenario applied to this application, and this application can also be applied to other scenarios.
  • Fig. 4 is a schematic flowchart of the inter-system handover method provided by the present application. The steps of the method 400 are described below.
  • the second access network device sends a first message to the second core network device.
  • the second core network device receives the first message.
  • the first message is used to request the first access network device to allocate resources for the terminal device.
  • the terminal device is a terminal device that will perform a handover process. After the first access network device allocates resources to the terminal device, the terminal device can be switched to the first access network device.
  • the first message may include the identification of the terminal device.
  • the identifier of the terminal device is the identifier of the terminal device on the second access network device side.
  • the content constituting the identification of the terminal device may include one or more of the following:
  • the frequency point of the terminal device in the serving cell of the second access network device, the PCI of the terminal device in the serving cell of the second access network device, and the terminal device in the serving cell of the second access network device are in the second session.
  • the transport layer information (such as the IP address of the tunnel port and/or the tunnel port identifier) corresponding to the user plane transmission tunnel between the access network device and the second core network device.
  • the identifier of the terminal device may be the aforementioned C-RNTI.
  • the identification of the terminal device may be jointly represented by the aforementioned frequency point, PCI, and C-RNTI.
  • the identifier of the terminal device in the interface between the second access network device and the second core network device may be assigned by the second access network device or may be assigned by the second core network device.
  • the serving cell of the terminal device in the second access network device refers to the serving cell provided by the second access network device for the terminal device.
  • the interface between the second access network device and the second core network device is an NG interface.
  • the identifier of the terminal device in the interface between the second access network device and the second core network device may be the RAN UE NGAP ID, and the second access network device uses the identifier to uniquely associate the terminal device on the NG interface.
  • the identifier of the terminal device in the interface between the second access network device and the second core network device may also be the AMF UE NGAP ID, and the second core network device uses the identifier to uniquely associate the terminal device on the NG interface.
  • the transmission layer information corresponding to the user plane transmission tunnel of the PDU session corresponding to the data service of the terminal device between the second access network device and the second core network device may be an NG user whose PDU session tunnel is on the second access network device side
  • Surface transport layer information such as GPRS tunneling protocol (GPRS tunneling protocol, GTP) tunnel port IP address and GTP tunnel port identifier.
  • the first message may also include the identification of the second access network device.
  • the first identification will be described below in combination with two scenarios.
  • the identifier when the second access network device provides the terminal device with the service connected to the second core network is the same as the identifier when the second access network device provides the terminal device with the service connected to the first core network.
  • identifier #1 the identifier of the second access network device in the following scenario is recorded as: identifier #1.
  • the content constituting identification #1 may include one or more of the following:
  • the global RAN identifier of the second access network device The global RAN identifier of the second access network device, the frequency of the cell managed by the second access network device, the PCI of the cell managed by the second access network device, and the terminal device in the second access network.
  • the global base station identifier may include a public land mobile network (PLMN) identifier and a base station identifier.
  • PLMN public land mobile network
  • the global base station identifier may be jointly represented by a PLMN identifier and a base station identifier.
  • the global base station identifier of the second access network device is the global NodeB ID of the second access network device. .
  • the identifier #1 may be jointly represented by the frequency point of the cell managed by the second access network device and the PCI of the cell managed by the second access network device.
  • the identifier #1 may be jointly represented by the frequency of the terminal device in the serving cell of the second access network device and the CGI of the terminal device in the serving cell of the second access network device.
  • the identifier when the second access network device provides the terminal device with the service connected to the second core network is different from the identifier when the second access network device provides the terminal device with the service connected to the first core network.
  • the identifier of the second access network device may be the identifier when the second access network device provides the terminal device with a service connected to the first core network.
  • the identifier of the second access network device may be the identifier when the second access network device provides the terminal device with a service connected to the second core network.
  • the identifier of the second access network device in Method 1 under Scenario 2 is recorded as: identifier #2; the identifier of the second access network device in Method 2 under Scenario 2 is recorded as : Logo #3.
  • the content constituting the mark #2 may include one or more of the following:
  • the second access network device provides the terminal device with the service of connecting to the first core network, the PCI and the second access
  • the network access device provides the terminal device with the service of connecting to the first core network
  • the terminal device is in the PCI of the serving cell of the second access network device
  • the second access network device provides the terminal device with the connection to the first core network.
  • the global base station identity may include a PLMN identity and a base station identity.
  • the base station identifier of the second access network device is en-gNB ID.
  • the identifier #2 may be the frequency points of all the cells managed by the second access network device when the second access network device provides the terminal device with the service connected to the first core network, and the second access network device is the When the terminal device provides the service connected to the first core network, the PCI of all the cells managed by the second access network device are collectively represented.
  • the second access network device provides the terminal device with a service connected to the first core network.
  • the global base station identifier of the second access network device is the global base station identifier global en-gNB ID of the second access network device as the access network device in the NSA network.
  • the frequency point of the cell managed by the second access network device is the second access network device as the access network device in the NSA network Frequency of the managed cell.
  • Other situations are similar, so I won't explain them one by one here.
  • the content constituting the mark #3 may include one or more of the following:
  • the frequency point of the cell managed by the second access network device when the second access network device provides the terminal device with the service of connecting to the second core network, the PCI and the second access of the cell managed by the second access network device
  • the network access device provides the terminal device with a service connected to the second core network
  • the terminal device is in the PCI of the serving cell of the second access network device
  • the second access network device provides the terminal device with the connection to the second core network.
  • the second access network device provides the terminal device with a service connected to the second core network when the terminal device is in the second access network device
  • the CGI of the serving cell when the terminal device is in the second access network device.
  • the global base station identity may include a PLMN identity and a base station identity.
  • the global base station identifier of the second access network device is the global base station identifier global gNB ID of the second access network device as the access network device under the SA.
  • the frequency point of the cell managed by the second access network device is managed by the second access network device as the access network device under the SA The frequency of the cell. Other situations are similar, so I won't repeat them here.
  • the first message may be a handover required (handover required) message, but this application does not limit this.
  • the identification of the second access network device and/or the identification of the terminal device may be carried by a source to target transparent container in the handover request message.
  • the second core network device sends a relocation request (relocation request) message to the first core network device.
  • the first core network device receives the redirection request message.
  • the redirection request message is used to request the first access network device to allocate resources for the terminal device.
  • the redirection request message may include the identification of the terminal device.
  • the orientation request message may also include the identifier of the second access network device.
  • redirection request message is only an exemplary name, and the redirection request message may also have other names.
  • the identification of the second access network device and/or the identification of the terminal device may be carried by the source-to-target transparent container in the redirection request message.
  • the first core network device sends a handover request (handover request) message to the first access network device.
  • the first access network device receives the handover request message.
  • the switching request message is used to request the terminal device to be switched to the first access network device, and request the first access network device to allocate resources for the terminal device.
  • the handover request message may include the identification of the terminal device.
  • the handover request message may also include the identifier of the second access network device.
  • handover request message is only an exemplary naming, and the handover request message may also have other names.
  • the identification of the second access network device and/or the identification of the terminal device may be carried by the source-to-target transparent container in the handover request message.
  • the first access network device determines that the secondary access network device added for the terminal device is the second access network device.
  • the first access network device may determine, according to the identifier of the second access network device, that the secondary access network device added to the terminal device is the second access network device.
  • the first access network device can be based on the serving cell identifier before the handover carried in the handover request message (for example, the handover request carries the movement history information of the terminal device, and the terminal device handover can be learned from the movement history information of the terminal device.
  • the previous serving cell, or the handover request directly carries the serving cell identifier before the handover), the second access network device before the handover is learned, so as to determine that the secondary access network device added for the terminal device is the second access network device .
  • S405 The first access network device sends an auxiliary access network device addition request message to the second access network device.
  • the second access network device receives the auxiliary access network device addition request message.
  • the auxiliary access network device addition request message includes the identification of the terminal device.
  • the auxiliary access network device addition request message is used to request to add (or add) the second access network device as the auxiliary access network device of the terminal device.
  • the first access network device may determine to add (or add) the second access network device corresponding to the identifier of the second access network device as the auxiliary device of the terminal device. Access network equipment. Then, S405 is executed.
  • the first access network device may first determine a secondary access network device, and then determine whether the determined secondary access network device is the second access network device according to the identifier of the second access network device ⁇ Net equipment. If the secondary access network device determined by the first access network device is the second access network device, execute S405.
  • the first access network device can determine that the access network device corresponding to the identifier of the second access network device is the second access network device, thereby determining that the auxiliary access network device added for the terminal device is the second access network device. ⁇ Net equipment.
  • the first access network device may, after receiving the handover request message, determine to add the second access network device corresponding to the identifier of the second access network device as the auxiliary access of the terminal device ⁇ Net equipment.
  • the first access network device may first determine a secondary access network device, and then compare whether the determined identity of the secondary access network device is the identity of the second access network device, if it is the second access network device , It can be determined that the secondary access network device is the second access network device.
  • the first access network device may determine that the secondary access network device added for the terminal device is the second access network device according to the identifier of the second access network device and the first mapping relationship.
  • the first mapping relationship is the identifier when the second access network device provides the terminal device with the service connected to the second core network and the second access network device provides the terminal device with the service connected to the first core network.
  • the mapping relationship between the identities That is, the first identifier is the mapping relationship between the identifier #2 and the identifier #3.
  • the first access network device may determine that identifier #3 corresponds to identifier #2 according to the mapping relationship between identifier #2 and identifier #3 . Therefore, the first access network device may use the access network device (ie, the second access network device) identified (or corresponding) with the identifier #2 as the auxiliary access network device. Alternatively, the first access network device may first determine a secondary access network device, and then compare whether the determined identifier of the secondary access network device is the identifier #2, and if it is the identifier #2, it is confirmed that it is added by the terminal device The secondary access network device is the second access network device.
  • the first mapping relationship may be sent by the second access network device to the first access network device.
  • the second access network device may send the first mapping relationship before step S404.
  • the second access network device may send the first mapping relationship to the first access network device.
  • the EN-DC X2 Setup Request or EN-DC X2 Setup Response (Setup Response) message can be carried between the first access network device and the second access network device.
  • a mapping relationship If it is the EN-DC X2 Setup request initiated by the second access network device, the message carries the first mapping relationship. If it is the EN-DC X2 Setup request initiated by the first access network device, the second access network device carries the first mapping relationship in the EN-DC X2 Setup Response.
  • mapping relationship between the identifier of the second access network device and the second identifier may include one or more of the following:
  • the second access network device provides a global base station identifier when the terminal device is connected to the first core network and the second access network device provides a global base station identifier when the terminal device is connected to the second core network.
  • the frequency point of the cell managed by the second access network device and the second access network device provide the terminal device with the connection to the second core network
  • the mapping relationship between the frequency points of the cells managed by the second access network device during the service time
  • the PCI of the cell managed by the second access network device and the second access network device provide the terminal device with the connection to the second core network
  • the mapping relationship between the PCIs of the cells managed by the second access network device during service
  • the terminal device When the second access network device provides the terminal device with the service of connecting to the first core network, the terminal device is in the PCI of the serving cell of the second access network device and the second access network device provides the terminal device with the connection to the first core network.
  • the terminal device When the second access network device provides the terminal device with a service connected to the first core network, the terminal device is at the frequency point of the serving cell of the second access network device and the second access network device provides the terminal device with connection to The mapping relationship between the frequency points of the terminal device in the serving cell of the second access network device during the service of the second core network;
  • the terminal device When the second access network device provides the terminal device with a service connected to the first core network, the terminal device’s CGI in the serving cell of the second access network device and the second access network device provides the terminal device with a connection to the first core network.
  • the first access network device may also select another access network device different from the second access network device as the auxiliary access network device.
  • the second access network device After the second access network device receives the auxiliary access network device addition request message, if it is determined according to the identification of the terminal device that the terminal device is the terminal device that the auxiliary access network device is serving (or before handover), Then, the transfer of data corresponding to the bearer terminating in the second access network device can be ignored. That is to say, for the data corresponding to the bearer terminating in the second access network device, the second access network does not need to be sent to the second core network first, and then transferred from the second core network to the first core network. The core network is sent to the second access network, and it does not need to be sent to the first access network device first, and then transferred from the first access network device to the second access network device.
  • the bearer terminated at the second access network device may include the SCG bearer terminated at the second access network device, the separate bearer terminated at the second access network device, and the MCG bearer terminated at the second access network device.
  • the second access network device can provide the first access network device with the identification of the terminal device that will perform the handover process during the handover process, and the first access network device determines the target auxiliary connection
  • the source access network device is provided with the The identification of the terminal device enables the source access network device to not transfer data corresponding to the bearer terminated at the source access network device, thereby reducing the data transmission delay.
  • the method may further include part or all of steps S406 to S413.
  • the second access network device sends an auxiliary access network device addition response message to the first access network device.
  • the first access network device receives the auxiliary access network device addition response message.
  • the second access network device After the second access network device receives the auxiliary access network device addition request message, if it agrees to be the auxiliary access network device of the terminal device, it sends an auxiliary access network device addition response message to the first access network device.
  • the first access network device will serve as the main access network device of the terminal device.
  • the first access network device sends a handover request confirmation message to the first core network device.
  • the handover request confirmation message may include indication information for maintaining the context of the terminal device.
  • the indication information of the terminal device context may be carried by the target to source transparent container in the handover request confirmation message.
  • the first core network device sends a redirection response message to the second core network device.
  • redirection response message is used to respond to the aforementioned redirection request message.
  • the redirection response message may include indication information for maintaining the context of the terminal device.
  • the indication information of the terminal device context may be carried in the target-to-source transparent container in the redirection response message.
  • S409 The second core network device sends a handover command to the second access network device.
  • the handover command is used to respond to the first message mentioned above.
  • the handover command may include indication information for maintaining the context of the terminal device.
  • the indication information of the terminal device context may be carried by the target-to-source transparent container in the handover command.
  • S410 The second access network device sends an RRC message to the terminal device.
  • the RRC message is used to notify the terminal device to switch to the first access network device.
  • the RRC message may be a mobility command from NR, mobilityfromNRCommand.
  • S411 The terminal device and the first access network device execute a random access procedure.
  • the terminal device sends an RRC connection reconfiguration complete (RRC connection reconfiguration complete) message to the first access network device.
  • RRC connection reconfiguration complete RRC connection reconfiguration complete
  • the terminal device can access the first access network device, and the second access network device can provide the terminal device with a service connected to the first core network.
  • S413 The terminal device and the second access network device perform a random access procedure.
  • This step can be executed or not.
  • the main function of this step is that the terminal device accesses the second access network device, and the second access network device adjusts the uplink timing for the terminal device to avoid interference between the terminal devices served by the second access network device.
  • the first access network device sends a secondary access network device reconfiguration complete message to the second access network device.
  • S415 The second access network device initiates data forwarding.
  • the second access network device sends (after the handover) the data corresponding to the bearer terminated in the first access network device to the first access network device.
  • These data include data that the second access network device has received from the second core network or/and subsequent data that will be received from the second core network.
  • the second access network device can directly send these data to the first access network device, or first to the second core network, and then from the second core network to the first core network, and then the first core network to the The first access network device.
  • the bearer terminating in the first access network device may include an SCG bearer terminating in the first access network device, a separate bearer terminating in the first access network device, and an MCG bearer terminating in the first access network device.
  • S415 may also be executed after S409.
  • S416 The first access network device sends a handover notification message to the first core network device.
  • the handover notification message is used to notify the first core network device that the handover of the terminal device in the first access network device has been completed.
  • the first core network device may send a bearer modification message to the first core network user plane device.
  • the first core network user plane device is an S-GW.
  • the bearer modification message is used to notify that the terminal device has accessed the target side device, and the user plane device of the first core network can notify the user plane device of the second core network to stop sending data to the second access network device.
  • S417 Perform data transmission between the second access network device and the terminal device.
  • the second access network device can be based on the mapping relationship between QoS flow and E-RAB, The data packet of the QoS flow received from the second core network device is mapped to the DRB corresponding to the handover E-RAB and sent to the terminal device.
  • the second access network device can be based on the mapping relationship between QoS flow and E-RAB , Map the E-RAB data packet received from the second core network device to the DRB corresponding to the switched QoS flow and send it to the terminal device.
  • the second access network device when the second access network device is performing data transmission with the terminal device, in order to make the data transmission between the second access network device and the terminal device uninterrupted, the second access network device can continue during the handover process Communicate with terminal equipment.
  • the second access network device continues to use the key before switching to communicate with the terminal device, and the second access network device uses the switched key (that is, as the key of the auxiliary access network device) to communicate with the terminal device. data communication.
  • Solution 1 The second access network device uses the key before the handover, transmits the data packet received from the second core network in the first DRB, and the second access network device uses the key after the handover.
  • the data packet corresponding to the bearer (the data packet received from the first core network) that is terminated at the second access network device is transmitted on the second DRB.
  • the first DRB may be one or more DRBs
  • the second DRB may be one or more DRBs, and there is no intersection between the first DRB and the second DRB.
  • Solution 2 The second access network device first uses the key before the handover to transmit the data packet received from the second core network on one or more DRBs. After the second access network device sends these data to the terminal device, the key after the handover is used to transmit on the one or more DRBs the bearer corresponding data packet that terminates at the second access network device (from the first A data packet received by the core network).
  • the second access network device establishes two logical channels in one DRB.
  • the second access network device uses the key before the handover to transmit the data packet received from the second core network on one of the logical channels, and uses the key after the handover to transmit on the other logical channel and terminates at the first The data packet corresponding to the bearer of the second access network device (the data packet received from the first core network).
  • Fig. 5 is a schematic block diagram of a communication device provided by an embodiment of the present application.
  • the communication device 1000 may include a transceiving unit 1100 and a processing unit 1200.
  • the transceiver unit 1100 may be used to send information to or receive information from other devices. For example, sending or receiving a request message for adding a secondary access network device.
  • the processing unit 1200 may be used to perform internal processing of the apparatus, for example, determining that the secondary access network device added for the terminal device is the second access network device.
  • the communication apparatus 1000 may correspond to the first access network device.
  • the communication device 1000 may be a first access network device or a chip configured in the first access network device, and it may include a unit for performing operations performed by the first access network device, and the communication device 1000 The units in are respectively intended to implement the operations performed by the first access network device in the foregoing method.
  • the transceiving unit 1100 is configured to receive a handover request message from a first core network device, where the handover request message includes an identifier of the terminal device, and the apparatus provides the terminal device with a connection to the first core network device.
  • Service the first core network device belongs to the first core network;
  • the processing unit 1200 is configured to determine that the secondary access network device added for the terminal device is a second access network device, and the second access network device The network device provides the terminal device with a service connected to the second core network;
  • the transceiving unit 1100 is further configured to send an auxiliary access network device addition request message to the second access network device, and the auxiliary access
  • the network device addition request message includes the identification of the terminal device.
  • the identity of the terminal device is a cell radio network temporary identity C-RNTI allocated by the terminal device to the terminal device in the serving cell of the second access network device, or the identity of the terminal device Is the identifier of the terminal device in the interface between the second access network device and the second core network device, and the second core network device belongs to the second core network.
  • the handover request message further includes the identifier of the second access network device.
  • the identifier of the second access network device is an identifier when the second access network device provides the terminal device with a service connected to the first core network.
  • the identifier of the second access network device is an identifier when the second access network device provides the terminal device with a service connected to the second core network.
  • the transceiving unit 1100 is further configured to: receive a first mapping relationship from the second access network device, where the first mapping relationship is that the second access network device provides the terminal device The mapping relationship between the identifier when connected to the service of the first core network and the identifier when the second access network device provides the terminal device with the service connected to the second core network; wherein, the processing The unit 1200 is specifically configured to determine, according to the identifier of the second access network device and the first mapping relationship, that the secondary access network device added for the terminal device is the second access network device.
  • the communication apparatus 1000 may correspond to a second access network device.
  • the communication device 1000 may be a second access network device or a chip configured in the second access network device, and it may include a unit for performing operations performed by the second access network device, and the communication device 1000 The units in are respectively intended to implement the operations performed by the second access network device in the above method.
  • the transceiving unit 1100 is configured to send a first message to the second core network device, the first message including the identification of the terminal device, and the apparatus provides the terminal device with a service connected to the second core network, so
  • the second core network device belongs to the second core network, the first message is used to request the first access network device to allocate resources for the terminal device, and the first access network device provides the terminal device A service connected to the first core network;
  • the transceiving unit 1100 is further configured to receive a secondary access network device addition request message from the first access network device, where the first access network device is the terminal
  • the main access network device of the device, the auxiliary access network device addition request message includes the identification of the terminal device, and the auxiliary access network device addition request message is used to request to add the device as the auxiliary device of the terminal device. Access network equipment.
  • the identifier of the terminal equipment is the cell radio network temporary identifier C-RNTI allocated to the terminal equipment in the serving cell of the apparatus, or the identifier of the terminal equipment is the terminal equipment The identifier in the interface between the device and the second core network device.
  • the first message further includes the identification of the device.
  • the identifier of the second access network device is an identifier when the apparatus provides the terminal device with a service connected to the first core network.
  • the identifier of the second access network device is an identifier when the apparatus provides the terminal device with a service connected to the second core network.
  • the transceiving unit 1100 is further configured to: send a first mapping relationship to the first access network device, where the first mapping relationship is for the apparatus to provide the terminal device with a connection to the first The mapping relationship between the identifier during the service of the core network and the device provides the terminal device with the identifier during the service connected to the second core network.
  • the transceiving unit 1100 is further configured to: send to the first access network device data corresponding to the bearer terminated in the first access network device.
  • the processing unit 1200 is configured to ignore the transfer of data corresponding to the bearer terminated in the device.
  • the processing unit 1200 is further configured to, according to the mapping relationship between the quality of service QoS flow and the radio access bearer E-RAB of the evolved universal terrestrial radio access network, from the second core network device
  • the received data packet of the QoS flow is mapped to the data radio bearer DRB corresponding to the handover E-RAB;
  • the sending unit 1100 is further configured to send the E-RAB mapped to the handover to the terminal device.
  • the data corresponding to the RAB radio bears the data packet on the DRB.
  • the communication apparatus 1000 may correspond to the first core network device.
  • the communication device 1000 may be a first core network device or a chip configured in the first core network device, and it may include a unit for performing operations performed by the first core network device, and each of the communication device 1000 The units are used to implement the operations performed by the first core network device in the foregoing method.
  • the transceiving unit 1100 is configured to receive a first message from the second access network device; the transceiving unit 1100 is further configured to send a redirection request message to the first core network device according to the first message.
  • the first message includes the identification of the terminal device, and the first message is used to request the first access network device to allocate resources for the terminal device.
  • the redirection request message includes the identification of the terminal device.
  • the second access network device provides the terminal device with a service connected to the second core network, and the first access network device provides the terminal device with a service connected to the first core network.
  • the device 1000 belongs to the second core network, and the first core network equipment belongs to the first core network.
  • the communication apparatus 1000 may correspond to a second core network device.
  • the communication device 1000 may be a second core network device or a chip configured in the second core network device, which may include a unit for performing operations performed by the second core network device, and each of the communication device 1000 The units are used to implement the operations performed by the second core network device in the foregoing method.
  • the transceiver unit 1100 is configured to receive a redirection request message from a second core network device, where the redirection request message includes the identification of the terminal device, and the second access network device provides the terminal device with a connection to the second core.
  • Network service the first access network device provides the terminal device with a service connected to the first core network; the transceiver unit is also used to send a handover request message to the first access network device, and the handover request message includes the The identification of the terminal device.
  • the second core network device belongs to the second core network, and the device 1000 belongs to the first core network.
  • the transceiver unit 1100 in the communication device 1000 may correspond to the RRU in the access network device 2000 shown in FIG. 6 2100.
  • the processing unit 1200 in the communication device 1000 may correspond to the BBU 2200 in the access network device 2000 shown in FIG. 6.
  • the transceiver unit 1100 in the communication device 1000 may be an input/output interface.
  • the transceiver unit 1100 in the communication device 1000 may correspond to the transceiver 3002 in the communication device 3000 shown in FIG.
  • the processing unit 1200 in the communication device 1000 may correspond to the processor 3001 in the communication device 3000 shown in FIG. 7.
  • Fig. 6 is a schematic structural diagram of an access network device provided by an embodiment of the present application, for example, it may be a schematic structural diagram of a base station.
  • the base station 2000 can be applied to the system shown in FIG. 3 to perform the functions of the first access network device or the second access network device in the foregoing method embodiment.
  • the base station 2000 may include one or more radio frequency units, such as a remote radio unit (RRU) 2100 and one or more baseband units (BBU) (also known as distributed unit (DU) )) 2200.
  • RRU 2100 may be called a transceiving unit or a communication unit, and corresponds to the transceiving unit 1100 in FIG. 5.
  • the transceiver unit 2100 may also be called a transceiver, a transceiver circuit, or a transceiver, etc., and it may include at least one antenna 2101 and a radio frequency unit 2102.
  • the transceiver unit 2100 may include a receiving unit and a transmitting unit, the receiving unit may correspond to a receiver (or receiver, receiving circuit), and the transmitting unit may correspond to a transmitter (or transmitter or transmitting circuit).
  • the RRU 2100 part is mainly used for receiving and sending radio frequency signals and converting radio frequency signals and baseband signals.
  • the 2200 part of the BBU is mainly used for baseband processing, control of the base station, and so on.
  • the RRU 2100 and the BBU 2200 may be physically set together, or may be physically separated, that is, a distributed base station.
  • the BBU 2200 is the control center of the base station, and may also be called a processing unit, which may correspond to the processing unit 1200 in FIG. 5, and is mainly used to complete baseband processing functions, such as channel coding, multiplexing, modulation, and spreading.
  • the BBU processing unit
  • the BBU may be used to control the base station to execute the operation procedure of the access network device in the foregoing method embodiment.
  • the BBU 2200 may be composed of one or more single boards, and multiple single boards may jointly support a radio access network (such as an LTE network) with a single access standard, or can support different access standards. Wireless access network (such as LTE network, 5G network or other networks).
  • the BBU 2200 further includes a memory 2201 and a processor 2202.
  • the memory 2201 is used to store necessary instructions and data.
  • the processor 2202 is used to control the base station to perform necessary actions, for example, to control the base station to execute the operation procedure of the access network device in the foregoing method embodiment.
  • the memory 2201 and the processor 2202 may serve one or more boards. In other words, the memory and the processor can be set separately on each board. It can also be that multiple boards share the same memory and processor. In addition, necessary circuits can be provided on each board.
  • the base station 2000 shown in FIG. 6 can implement each process involving the first access network device or the second access network device in the foregoing method embodiments.
  • the operation or function of each module in the base station 2000 is to implement the corresponding process in the foregoing method embodiment.
  • the above-mentioned BBU 2200 can be used to perform the actions implemented by the first access network device or the second access network device described in the previous method embodiments, and the RRU 2100 can be used to perform the first access network device described in the previous method embodiments.
  • the sending or receiving action of the network access device or the second access network device please refer to the description in the previous method embodiment, which will not be repeated here.
  • FIG. 7 is a schematic structural diagram of a communication device 3000 provided by an embodiment of the present application.
  • the communication device 3000 includes a processor 3001 and a transceiver 3002.
  • the communication device 3000 may further include a memory 3003.
  • the processor 3001, the transceiver 3002, and the memory 3003 can communicate with each other through internal connection paths to transfer control and/or data signals.
  • the memory 3003 is used to store a computer program, and the processor 3001 is used to call and run the computer program from the memory 3003 to implement the foregoing method embodiments.
  • processor 3001 and memory 3003 can be combined into one processing device. It should be understood that the memory 3003 may also be integrated in the processor 3001 or independent of the processor 3001. This application does not limit this.
  • the communication device 3000 is used to execute the actions performed by the first core network device in the above method embodiment.
  • the program stored in the memory 3003 is executed so that the processor 3001 is used to execute the above In the method embodiment of the text, the internal processing operation (such as the determining step) on the device side of the first core network, the execution of the program stored in the memory 3003, causes the processor 3001 to control the transceiver 3002 to execute the first core in the above method embodiment Receiving and sending steps on the network equipment side.
  • the communication device 3000 is used to perform the actions performed by the second core network device in the above method embodiment.
  • the program stored in the memory 3003 is executed so that the processor 3001 is used to execute the above In the method embodiment of the text, the internal processing operation (such as the determining step) of the second core network device side, the execution of the program stored in the memory 3003, causes the processor 3001 to control the transceiver 3002 to execute the second core in the above method embodiment Receiving and sending steps on the network equipment side.
  • the processing device or processor may be a chip.
  • the processing device or processor may be a field programmable gate array (FPGA), a general-purpose processor, a digital signal processor (digital signal processor, DSP), or an application specific integrated circuit (FPGA).
  • ASIC field programmable gate array
  • FPGA field programmable gate array
  • SoC system on chip
  • CPU central processor unit
  • NP network processor
  • DSP digital signal processing circuit
  • microcontroller unit microcontroller unit
  • MCU MCU
  • PLD programmable logic device
  • the general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a mature storage medium in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers.
  • the storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.
  • the memory 3003 may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory can be read-only memory (ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), and electrically available Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory.
  • the volatile memory may be random access memory (RAM), which is used as an external cache.
  • RAM random access memory
  • static random access memory static random access memory
  • dynamic RAM dynamic RAM
  • DRAM dynamic random access memory
  • synchronous dynamic random access memory synchronous DRAM, SDRAM
  • double data rate synchronous dynamic random access memory double data rate SDRAM, DDR SDRAM
  • enhanced synchronous dynamic random access memory enhanced SDRAM, ESDRAM
  • synchronous connection dynamic random access memory serial DRAM, SLDRAM
  • direct rambus RAM direct rambus RAM, DR RAM
  • memories of the systems and methods described herein are intended to include, but are not limited to, these and any other suitable types of memories.
  • This application also provides a computer program product, the computer program product comprising: computer program code, when the computer program code runs on a computer, causes the computer to execute the foregoing method embodiment by the first access network device, the second A method executed by the access network device, the first core network device, or the second core network device.
  • the present application also provides a computer-readable medium that stores program code, and when the program code runs on a computer, the computer executes the foregoing method embodiment by the first access network device, the second A method executed by the access network device, the first core network device, or the second core network device.
  • the present application also provides a system, which includes at least two of the first access network device, the second access network device, the first core network device, and the second core network device.
  • An embodiment of the present application also provides a processing device, including a processor and an interface; the processor is configured to execute the first access network device, the second access network device, and the first core involved in any of the foregoing method embodiments. The method executed by the network device or the second core network device.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium.
  • the computer instructions may be transmitted from a website, computer, server, or data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center integrated with one or more available media.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a high-density digital video disc (digital video disc, DVD)), or a semiconductor medium (for example, a solid state disk (solid state disc), SSD)) etc.
  • a component may be, but is not limited to, a process, a processor, an object, an executable file, an execution thread, a program, or a computer running on the processor.
  • the application running on the computing device and the computing device can be components.
  • One or more components can reside in a process or thread of execution, and the components can be located on one computer or distributed between two or more computers.
  • these components can be executed from various computer readable media having various data structures stored thereon.
  • a component can pass a local signal based on a signal having one or more data packets (for example, data from two components that interact with another component in a local system, a distributed system, or a network, such as the Internet that interacts with other systems through a signal). Or remote process to communicate.
  • a signal having one or more data packets for example, data from two components that interact with another component in a local system, a distributed system, or a network, such as the Internet that interacts with other systems through a signal.
  • remote process to communicate for example, data from two components that interact with another component in a local system, a distributed system, or a network, such as the Internet that interacts with other systems through a signal.
  • a corresponding to B means that B is associated with A, and B can be determined according to A.
  • determining B based on A does not mean that B is determined only based on A, and B can also be determined based on A and/or other information.
  • the terminal device and/or the network device can perform some or all of the steps in the embodiments of the present application. These steps or operations are only examples, and the embodiments of the present application may also perform other operations or various operations. Deformation of the operation. In addition, each step may be executed in a different order presented in the embodiments of the present application, and it may not be necessary to perform all the operations in the embodiments of the present application.
  • the disclosed system, device, and method can be implemented in other ways.
  • the device embodiments described above are merely illustrative, for example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or It can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium.
  • the technical solution of the present application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read only memory ROM, random access memory RAM, magnetic disk or optical disk and other media that can store program codes.

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Abstract

本申请提供了一种系统间切换方法和通信装置，可以应用于系统间切换的场景。在切换过程中，源接入网设备可以向目标接入网设备提供终端设备的标识，目标接入网设备在确定增加源接入网设备为辅接入网设备的情况下，可以向源接入网设备发送携带该终端设备的标识的辅接入网设备增加请求消息。源接入网设备在确定作为该终端设备的辅接入网的设备的情况下，可以不转移终结于源接入网设备的承载对应的数据，进而能够避免数据转移带来的时延。

Description

系统间切换方法和通信装置
本申请要求于2020年02月14日提交中国专利局、申请号为202010093924.6、申请名称为“系统间切换方法和通信装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信领域，并且更具体地，涉及一种系统间切换方法和通信装置。
背景技术
在无线网络中，一个终端设备可能和多个接入网设备通信，即多无线的双连接(multi-radio dual connectivity，MR-DC)。双连接包括多种类型，比如演进的通用陆基无线接入(evolved universal terrestrial radio access，E-UTRA)和新无线组成的双连接(E-UTRA-NR dual connectivity，EN-DC)。
终端可以进行系统间切换，比如从通过接入新无线接入技术(new radio access technology，NR)基站连接到第五代(5th generation，5G)核心网(5G core，5GC)切换到通过接入长期演进(long term evolution，LTE)基站连接到第4代(4th generation，4G)核心网中。在系统间切换场景下，源核心网发给源接入网设备的一些数据包转移到目标系统中的目标接入网设备中。其中，一种方案是源接入网设备先将数据包转移给源系统的源核心网，源核心网再转移给目标系统的目标核心网，目标核心网再转给目标接入网设备。另一种方案是源接入网设备将数据包直接转移给目标接入网设备。数据包转移到目标接入网设备后，目标接入网设备再将数据包发送给终端设备。
现有技术中提到进行系统间切换时，目标接入网设备可以为终端设备配置MR-DC，这种场景下该如何进行数据转移是成为一项亟待解决的技术问题。
发明内容
本申请提供了一种系统间切换方法和通信装置，能够在目标辅接入网设备为源接入网设备的场景下，不转移终结于源接入网设备的承载对应的数据，进而能够避免数据转移带来的时延。
第一方面，提供了一种系统间切换方法，该方法包括：第一接入网设备接收来自第一核心网设备的切换请求消息，该切换请求消息包括终端设备的标识，第一接入网设备为终端设备提供连接到第一核心网的服务，第一核心网设备属于第一核心网；第一接入网设备确定为该终端设备添加的辅接入网设备是第二接入网设备，第二接入网设备为该终端设备提供连接到第二核心网的服务；第一接入网设备向第二接入网设备发送辅接入网设备增加请求消息，该辅接入网设备增加请求消息包括该终端设备的标识。
可选地，该终端设备的标识为该终端设备在第二接入网设备的服务小区为该终端设备 分配的小区无线网络临时标识(cell radio network temporary identifier,C-RNTI，或者该终端设备的标识为该终端设备在第二接入网设备与第二核心网设备之间的接口中的标识。第二核心网设备属于第二核心网。
终端设备在第二接入网设备与第二核心网设备之间的接口中的标识，可以是第二接入网设备分配的，也可以是第二核心网设备分配的。
根据本申请提供的方法，第二接入网设备可以在切换过程中向第一接入网设备提供将要执行切换流程的终端设备的标识，在第一接入网设备确定辅接入网设备与源接入网设备(即，第二接入网设备)为同一接入网设备的情况下，通过向源接入网设备提供该终端设备的标识，可以使得源接入网设备对终结于源接入网设备的承载对应的数据不进行数据转移，从而能够减低数据传输时延。
结合第一方面，在第一方面的某些实现方式中，该切换请求消息还可以包括第二接入网设备的标识。
可选地，第一接入网设备可以根据第二接入网设备的标识，确定为该终端设备添加的辅接入网设备是第二接入网设备。
可选地，第二接入网设备的标识为第二接入网设备为该终端设备提供连接到第一核心网的服务时的标识。
例如，构成第二接入网设备的标识的内容可以包括下述中的一项或多项：
第二接入网设备为该终端设备提供连接到第一核心网的服务时第二接入网设备的全球基站标识，第二接入网设备为该终端设备提供连接到第一核心网的服务时第二接入网设备管理的小区的频点、第二接入网设备为该终端设备提供连接到第一核心网的服务时第二接入网设备管理的小区的物理小区标识(physical cell identifier，PCI)、第二接入网设备为该终端设备提供连接到第一核心网的服务时该终端设备在第二接入网设备的服务小区的PCI、第二接入网设备为该终端设备提供连接到第一核心网的服务时该终端设备在第二接入网设备的服务小区的频点、第二接入网设备为该终端设备提供连接到第一核心网的服务时该终端设备在第二接入网设备的服务小区的全球小区标识(cell global identifier,CGI)。
可选地，第二接入网设备的标识为第二接入网设备为该终端设备提供连接到所述第二核心网的服务时的标识。
例如，构成第二接入网设备的标识的内容可以包括下述中的一项或多项：
第二接入网设备为该终端设备提供连接到第二核心网的服务时第二接入网设备的全球基站标识，第二接入网设备为该终端设备提供连接到第二核心网的服务时第二接入网设备管理的小区的频点、第二接入网设备为该终端设备提供连接到第二核心网的服务时第二接入网设备管理的小区的PCI、第二接入网设备为该终端设备提供连接到第二核心网的服务时该终端设备在第二接入网设备的服务小区的PCI、第二接入网设备为该终端设备提供连接到第二核心网的服务时该终端设备在第二接入网设备的服务小区的频点、第二接入网设备为该终端设备提供连接到第二核心网的服务时该终端设备在第二接入网设备的服务小区的CGI。
示例性的，第二接入网设备为该终端设备提供连接到第一核心网的服务时的标识和第二接入网设备为该终端设备提供连接到第二核心网的服务时的标识可以相同，也可以不 同。
结合第一方面，在第一方面的某些实现方式中，在第一接入网设备向第二接入网设备发送辅接入网设备增加请求消息之前，该方法还可以包括：第一接入网设备接收来自第二接入网设备的第一映射关系，所述第一映射关系为第二接入网设备为该终端设备提供连接到第一核心网的服务时的标识和第二接入网设备为该终端设备提供连接到第二核心网的服务时的标识之间的映射关系；其中，第一接入网设备确定为该终端设备添加的辅接入网设备是第二接入网设备，包括：第一接入网设备根据第二接入网设备的标识以及第一映射关系，确定为该终端设备添加的辅接入网设备是第二接入网设备。
第二方面，提供了一种系统间切换方法，该方法包括：第二接入网设备向第二核心网设备发送第一消息，第一消息包括终端设备的标识，第二接入网设备为该终端设备提供连接到第二核心网的服务，第一消息用于请求第一接入网设备为该终端设备分配资源，第一接入网设备为该终端设备提供连接到第一核心网的服务；第二接入网设备接收来自第一接入网设备的辅接入网设备增加请求消息，第一接入网设备为该终端设备的主接入网设备，辅接入网设备增加请求消息包括该终端设备的标识，辅接入网设备增加请求消息用于请求添加第二接入网设备为该终端设备的辅接入网设备。第二核心网设备属于第二核心网。
可选地，该终端设备的标识为该终端设备在第二接入网设备的服务小区为该终端设备分配的C-RNTI，或者该终端设备的标识为该终端设备在第二接入网设备与第二核心网设备之间的接口中的标识。
终端设备在第二接入网设备与第二核心网设备之间的接口中的标识，可以是第二接入网设备分配的，也可以是第二核心网设备分配的。
第二接入网设备接收到辅接入网设备增加请求消息后，若根据该终端设备的标识，确定该终端设备是该辅接入网设备正在服务(或者说，切换之前)的终端设备，则可以忽略终结于第二接入网设备的承载对应的数据的转移。也就是说，对于终结于第二接入网设备的承载对应的数据，第二接入网设备不需要先发送给第二核心网，再由第二核心网转给第一核心网，由第一核心网发送给第二接入网设备。
应理解，终结于第二接入网设备的承载可以包括终结于第二接入网设备的辅小区组(secondary cell group，SCG)承载、终结于第二接入网设备的分离承载和终结于第二接入网设备的主小区组(master cell group，MCG)承载。
因此，根据本申请提供的方法，第二接入网设备可以在切换过程中向第一接入网设备提供将要执行切换流程的终端设备的标识，在第一接入网设备确定辅接入网设备与源接入网设备(即，第二接入网设备)为同一接入网设备的情况下，通过向源接入网设备提供该终端设备的标识，可以使得源接入网设备对终结于源接入网设备的承载对应的数据不进行数据转移，从而能够减低数据传输时延。
结合第二方面，在第二方面的某些实现方式中，第一消息还可以包括第二接入网设备的标识。
可选地，第二接入网设备的标识为第二接入网设备为该终端设备提供连接到第一核心网的服务时的标识。
可选地，第二接入网设备的标识为第二接入网设备为该终端设备提供连接到所述第二核心网的服务时的标识。
结合第二方面，在第二方面的某些实现方式中，在第二接入网设备接收来自第一接入网设备的辅接入网设备增加请求消息之前，该方法还可以包括：
第二接入网设备向第一接入网设备发送第一映射关系，第一映射关系为第二接入网设备为该终端设备提供连接到第一核心网的服务时的标识和第二接入网设备为该终端设备提供连接到第二核心网的服务时的标识之间的映射关系。
从而，在第一接入网设备接收到第二接入网设备为该终端设备提供连接到第二核心网的服务时的标识时，第一接入网设备可以根据第一映射关系，确定辅接入网设备是否为第二接入网设备。
结合第二方面，在第二方面的某些实现方式中，该方法还可以包括：第二接入网设备向第一接入网设备发送终结于第一接入网设备的承载对应的数据。
应理解，这些数据包括第二接入网设备已经从第二核心网接收的数据或/和后续将从第二核心网接收的数据。第二接入网设备可以直接把这些数据发送给第一接入网设备，也可以先发送给第二核心网，再由第二核心网转给第一核心网，由第一核心网发送给第一接入网设备。
结合第二方面，在第二方面的某些实现方式中，该方法还可以包括：第二接入网设备根据服务质量(quality of service，QoS)流与演进的通用陆地无线接入网络的无线接入承载(E-UTRAN radio access bearer，E-RAB)之间的映射关系，将从第二核心网接收到的QoS流的数据包映射到切换后的E-RAB对应的数据无线承载(data radio bearer，DRB)上发送。
结合第二方面，在第二方面的某些实现方式中，该方法还可以包括：第二接入网设备使用切换前的密钥与终端设备进行数据通信，并使用切换后的秘钥(即作为辅接入网设备的密钥)与该终端设备进行数据通信。
基于该方案，可以避免切换过程中的数据中断。
第三方面，提供了一种系统间切换方法，该方法包括：第二核心网设备接收来自第二接入网设备的第一消息；第二核心网设备根据第一消息，向第一核心网设备发送重定向请求消息。其中，第一消息包括终端设备的标识，第一消息用于请求第一接入网设备为该终端设备分配资源。该重定向请求消息包括该终端设备的标识。第二接入网设备为该终端设备提供连接到第二核心网的服务，第一接入网设备为该终端设备提供连接到第一核心网的服务。第二核心网设备属于第二核心网，第一核心网设备属于第一核心网。
在本申请中，第二核心网设备可以通过第一核心网设备将该终端设备的标识发送给第一接入网设备。
因此，根据本申请提供的方法，第二接入网设备可以在切换过程中，通过第一核心网设备和第二核心网设备向第一接入网设备提供将要执行切换流程的终端设备的标识，在第一接入网设备确定辅接入网设备与源接入网设备(即，第二接入网设备)为同一接入网设备的情况下，通过向源接入网设备提供该终端设备的标识，可以使得源接入网设备对终结于源接入网设备的承载对应的数据不进行数据转移，从而能够减低数据传输时延。
结合第三方面，在第三方面的某些实现方式中，该重定向请求消息可以包括第二接入网设备的标识。
第四方面，提供了一种系统间切换方法，该方法包括：第一核心网设备接收来自第二 核心网设备从接收重定向请求消息，该重定向请求消息包括终端设备的标识，第二接入网设备为该终端设备提供连接到第二核心网的服务，第一接入网设备为该终端设备提供连接到第一核心网的服务；第一核心网设备向第一接入网设备发送切换请求消息，该切换请求消息包括该终端设备的标识。第二核心网设备属于第二核心网，第一核心网设备属于第一核心网。
因此，根据本申请提供的方法，第二接入网设备可以在切换过程中，通过第一核心网设备和第二核心网设备向第一接入网设备提供将要执行切换流程的终端设备的标识，在第一接入网设备确定辅接入网设备与源接入网设备(即，第二接入网设备)为同一接入网设备的情况下，通过向源接入网设备提供该终端设备的标识，可以使得源接入网设备对终结于源接入网设备的承载对应的数据不进行数据转移，从而能够减低数据传输时延。
结合第四方面，在第四方面的某些实现方式中，该重定向请求消息可以包括第二接入网设备的标识。
结合第四方面，在第四方面的某些实现方式中，该切换请求消息可以包括第二接入网设备的标识。
第五方面，提供了一种通信装置，包括用于执行第一方面或第二方面以及第一方面或第二方面中任一种可能实现方式中的方法的各个模块或单元。
第六方面，提供了一种通信装置，包括处理器。该处理器与存储器耦合，可用于执行存储器中的指令，以实现上述第一方面或第二方面以及第一方面或第二方面中任一种可能实现方式中的方法。可选地，该通信装置还包括存储器。可选地，该通信装置还包括通信接口，处理器与通信接口耦合。
可选地，该通信接口为收发器，或，输入/输出接口。
可选地，该收发器可以为收发电路。可选地，该输入/输出接口可以为输入/输出电路。
第七方面，提供了一种通信装置，包括用于执行第三方面或第四方面以及第三方面或第四方面中任一种可能实现方式中的方法的各个模块或单元。
第八方面，提供了一种通信装置，包括处理器。该处理器与存储器耦合，可用于执行存储器中的指令，以实现上述第三方面或第四方面以及第三方面或第四方面中任一种可能实现方式中的方法。可选地，该通信装置还包括存储器。可选地，该通信装置还包括通信接口，处理器与通信接口耦合。
可选地，该通信接口为收发器，或，输入/输出接口。
可选地，该收发器可以为收发电路。可选地，该输入/输出接口可以为输入/输出电路。
第九方面，提供了一种处理器，包括：输入电路、输出电路和处理电路。该处理电路用于通过该输入电路接收信号，并通过该输出电路发射信号，使得该处理器执行第一方面至第四方面以及第一方面至第四方面任一种可能实现方式中的方法。
在具体实现过程中，上述处理器可以为芯片，输入电路可以为输入管脚，输出电路可以为输出管脚，处理电路可以为晶体管、门电路、触发器和各种逻辑电路等。输入电路所接收的输入的信号可以是由例如但不限于接收器接收并输入的，输出电路所输出的信号可以是例如但不限于输出给发射器并由发射器发射的，且输入电路和输出电路可以是同一电路，该电路在不同的时刻分别用作输入电路和输出电路。本申请实施例对处理器及各种电路的具体实现方式不做限定。
第十方面，提供了一种处理装置，包括处理器和存储器。该处理器用于读取存储器中存储的指令，并可通过接收器接收信号，通过发射器发射信号，以执行第一方面至第四方面以及第一方面至第四方面任一种可能实现方式中的方法。
可选地，该处理器为一个或多个，该存储器为一个或多个。
可选地，该存储器可以与该处理器集成在一起，或者该存储器与处理器分离设置。
在具体实现过程中，存储器可以为非瞬时性(non-transitory)存储器，例如只读存储器(read only memory，ROM)，其可以与处理器集成在同一块芯片上，也可以分别设置在不同的芯片上，本申请实施例对存储器的类型以及存储器与处理器的设置方式不做限定。
应理解，相关信息交互过程可以为从处理器输出信息的过程，接收信息可以为处理器接收信息的过程。具体地，处理输出的信息可以输出给发射器，处理器接收的输入信息可以来自接收器。其中，发射器和接收器可以统称为收发器。
上述第十方面中的处理装置可以是一个芯片，该处理器可以通过硬件来实现也可以通过软件来实现，当通过硬件实现时，该处理器可以是逻辑电路、集成电路等；当通过软件来实现时，该处理器可以是一个通用处理器，通过读取存储器中存储的软件代码来实现，该存储器可以集成在处理器中，可以位于该处理器之外，独立存在。
第十一方面，提供了一种计算机程序产品，该计算机程序产品包括：计算机程序(也可以称为代码，或指令)，当该计算机程序被运行时，使得计算机执行上述第一方面至第四方面以及第一方面至第四方面中任一种可能实现方式中的方法。
第十二方面，提供了一种计算机可读介质，该计算机可读介质存储有计算机程序(也可以称为代码，或指令)当其在计算机上运行时，使得计算机执行上述第一方面至第四方面以及第一方面至第四方面中任一种可能实现方式中的方法。
第十三方面，提供了一种通信系统，包括前述的第一接入网设备、第二接入网设备、第一核心网设备和第二核心网设备中的至少两项。
附图说明
图1是一种用户面协议栈示意图。
图2是一种MCG承载，SCG承载和分离承载的协议栈示意图。
图3是应用于本申请的系统架构的示意图。
图4是本申请提供的系统间切换方法的示例性流程图。
图5是本申请提供的通信装置的示意性框图。
图6是本申请提供的接入网设备的结构示意图。
图7是本申请提供的另一通信装置的结构示意图。
具体实施方式
下面将结合附图，对本申请中的技术方案进行描述。
在无线网络中，一个终端设备可能和多个接入网设备通信，即终端设备可以进行双连接(dual connectivity，DC)通信。DC场景中，主接入网设备和辅接入网设备的制式或者说采用的无线接入技术(radio access technology，RAT)可以相同或者不同。
多无线的双连接(multi-radio dual connectivity，MR-DC)是DC的一种类型。MR-DC中的接入网设备包括采用不同或相同RAT的主接入网设备和辅接入网设备。主接入网设备为MR-DC中与核心网有控制面信令交互的接入网设备，MR-DC中其他的接入网设备为辅接入网设备。一般地，主接入网设备也称为主节点(master node，MN)，辅接入网设备也称为辅节点(secondary node，SN)。
MR-DC包括多种类型，比如，演进的通用陆基无线接入(evolved universal terrestrial radio access，E-UTRA)和新无线组成的双连接(E-UTRA-NR dual connectivity，EN-DC)、下一代无线接入节点(next generation radio access network，NG-RAN)演进的通用陆基无线接入和新无线组成的双连接(NG-RAN E-UTRA-NR dual connectivity，NGEN-DC)、新无线和演进的通用陆基无线接入组成的双连接(NR-E-UTRA dual connectivity，NE-DC)、新无线和新无线组成的双连接(NR-NR dual connectivity，NR-DC)。
其中，EN-DC中主接入网设备和辅接入网设备为终端设备提供连接到第4代(4th generation，4G)核心网的服务，4G核心网可以称为演进型分组核心网(evolved packet core，EPC)。并且，主接入网设备为长期演进(long term evolution，LTE)接入网设备，也称为演进基站(Evolution Node B，eNB)，辅接入网设备为NR接入网设备，也称为gNB。EN-DC有时也称为非独立(non standalone，NSA)组网，在EN-DC网络中，终端设备并不能驻留在NR小区。能驻留终端设备的NR接入网设备有时也称为独立(standalone，SA)NR接入网设备。
NGEN-DC中主接入网设备和辅接入网设备为终端设备提供连接到第五代(5th generation，5G)核心网(5G core，5GC)的服务。并且，主接入网设备为LTE接入网设备，辅接入网设备为NR接入网设备。
NE-DC中主接入网设备和辅接入网设备为终端设备提供连接到5GC的服务。并且，主接入网设备为NR接入网设备，辅接入网设备为LTE接入网设备。
NR-DC中主接入网设备和辅接入网设备为终端设备提供连接到5GC的服务。并且，主接入网设备为和辅接入网设备均为NR接入网设备。
应理解，本申请中，接入网设备为终端设备提供连接到EPC的服务是指，终端设备和EPC之间的数据面传输是经过接入网设备来传输的。接入网设备为终端设备提供连接到5GC的服务是指，终端设备和5GC之间的数据面传输是经过接入网设备来传输的。
需要说明的是，当eNB为UE提供连接到5GC的服务时，eNB也称为ng-eNB.当gNB为UE提供连接到EPC的服务时，gNB也称为en-gNB.MR-DC中各接入网设备具有不同的无线链路控制(radio link control，RLC)RLC/媒体接入控制(medium access control，MAC)实体。MR-DC中数据无线承载(data radio bearer，DRB)分为主小区组(master cell group，MCG)承载(bearer)、辅小区组(secondary cell group，SCG)承载和分离(split)承载。其中，MCG承载是指该DRB的RLC/MAC实体只在主接入网设备上；SCG承载是指该DRB的RLC/MAC实体只在辅接入网设备上；分离承载是指该DRB的RLC/MAC实体在主接入网设备和辅接入网设备上都有。对于包数据汇聚协议(packet data convergence protocol，PDCP)终结在主接入网设备上的承载，称为MN terminated承载。对于MN terminated承载，下行数据从核心网直接到达主接入网设备，经由主接入网设备的PDCP/服务数据适配协议(service data adaptation protocol，SDAP)处理后再经过 RLC/MAC发送给终端设备；上行数据从主接入网设备的PDCP/SDAP处理后发送给核心网。对于PDCP终结在辅接入网设备上的承载，称为SN terminated承载。对于SN terminated承载，下行数据从核心网直接到达辅接入网设备，经由辅接入网设备的PDCP/SDAP处理后再经过RLC/MAC发送给终端设备部；上行数据从辅接入网设备的PDCP/SDAP处理后发送给核心网。
参见图1，图1示出了网络侧EN-DC的用户面协议栈，以及连接到5GC的MR-DC的用户面协议栈。应理解，每个承载的传输需要经由RLC/MAC和PDCP/SDAP。
参见图2，图2示出了NGEN-DC/NE-DC/NR-DC中网络侧的MCG承载，SCG承载和分离承载的协议栈示意图。
本申请的方案适用于非MR-DC(non MR-DC)到MR-DC的系统间切换。也就是说，在切换前，终端设备仅通过一个接入网设备接入核心网，在切换后，终端设备通过DC方式接入核心网，并且切换前和切换后的核心网不同，比如一个为EPC，一个为5GC。
图3是适用于本申请的一个通信场景的示意图。图3所示的场景为从NR到EN-DC的系统间切换。如图3所示，在切换前，gNB为UE提供连接到5GC的服务。在切换后，gNB和eNB通过DC方式为UE提供服务，其中，eNB为UE的主接入网设备，gNB为UE的辅接入网设备。并且，切换后，gNB和eNB为UE提供连接到EPC的服务。
应理解，本申请中的接入网设备是一种部署在无线接入网中为终端设备提供无线通信功能的装置。例如，4G网络中的接入网设备，即LTE接入网设备包括但不限于：演进型节点B(evolved Node B，eNB)、无线网络控制器(Radio Network Controller，RNC)、节点B(Node B，NB)、基站控制器(Base Station Controller，BSC)、基站收发台(Base Transceiver Station，BTS)、家庭基站(例如，Home evolved NodeB，或Home Node B，HNB)、基带单元(BaseBand Unit，BBU)，无线保真(Wireless Fidelity，WIFI)系统中的接入点(Access Point，AP)、无线中继节点、无线回传节点、传输点(transmission point，TP)或者发送接收点(transmission and reception point，TRP)等。再如，5G网络中的接入网设备，即NR接入网设备包括但不限于：gNB，传输点(TRP或TP)，5G系统中的基站的一个或一组(包括多个天线面板)天线面板。或者，5G网络中的接入网设备还可以是构成gNB或传输点的网络节点，如基带单元(BBU)，或，分布式单元(distributed unit，DU)、云无线接入网络(cloud radio access network，CRAN)场景下的无线控制器、可穿戴设备或车载设备等。
在一些部署中，gNB可以包括集中式单元(centralized unit，CU)和DU。gNB还可以包括射频单元(radio unit，RU)。CU实现gNB的部分功能，DU实现gNB的部分功能，比如，CU实现无线资源控制(radio resource control，RRC)，分组数据汇聚层协议(packet data convergence protocol，PDCP)层的功能，DU实现无线链路控制(radio link control，RLC)层、媒体接入控制(media access control，MAC)层和物理(physical，PHY)层的功能。由于RRC层的信息最终会变成PHY层的信息，或者，由PHY层的信息转变而来，因而，在这种架构下，高层信令，如RRC层信令，也可以认为是由DU发送的，或者，由DU+CU发送的。可以理解的是，网络设备可以为CU节点、或DU节点、或包括CU节点和DU节点的设备。此外，CU可以划分为接入网(radio access network，RAN)中的网络设备，也可以将CU划分为核心网(core network，CN)中的网络设备，本申请 对此不做限定。
还应理解，本申请中，EPC中的控制面设备可以是移动性管理实体(mobility management entity，MME)，或者还可以是具有MME功能的实体。5GC中的控制面设备可以是接入和移动管理实体(access and mobility management function，AMF)，或者还可以是具有AMF功能的实体。
还应理解，本申请中的终端设备也可以称为用户设备(user equipment，UE)、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置。本申请的实施例中的终端设备可以是手机(mobile phone)、平板电脑(pad)、带无线收发功能的电脑、虚拟现实(virtual reality，VR)终端设备、增强现实(augmented reality，AR)终端设备、工业控制(industrial control)中的无线终端、无人驾驶(self driving)中的无线终端、远程医疗(remote medical)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端等。
当前技术中，在例如图3所示的场景中，在切换后，即使终结于gNB的承载对应的数据包，也需要重新转移到gNB，这将带来数据传输时延。
为解决上述问题，本申请提供了一种系统间切换方法。下面对本申请的方案进行说明。
为介绍本申请的方案之前，首先对第一接入网设备、第二接入网设备、第一核心网设备、第二核心网设备进行说明。
在终端设备切换之前，第二接入网设备为该终端设备提供连接到第二核心网的服务。在终端设备切换之后，第二接入网设备为该终端设备提供连接到第一核心网的服务，第一接入网设备为终端设备提供连接到第一核心网的服务。
第一核心网设备为第一核心网中的控制面设备，第二核心网设备为第二核心网中的控制面设备。
比如，第一核心网可以是EPC，第二核心网可以是5GC。在此情况下，例如，第一接入网设备、第二接入网设备、第一核心网设备、第二核心网设备可以分别对应于图3所示的场景中的eNB、gNB、EPC中的控制面设备、5GC中的控制面设备。
再如，第二核心网可以是EPC，第一核心网可以是5GC。又如，第一核心网可以是5GC，第二核心网可以是未来的6G核心网。
第一核心网设备和第二核心网设备可以完全不同，或者有些功能可以相同。
应理解，图3仅是应用于本申请的一个示例性场景，本申请还可以应用于其他场景。
图4是本申请提供的系统间切换方法的示意性流程图。下面对该方法400的各步骤进行说明。
S401，第二接入网设备向第二核心网设备发送第一消息。相应地，第二核心网设备接收第一消息。
第一消息用于请求第一接入网设备为终端设备分配资源。该终端设备为将要执行切换流程的终端设备，在第一接入网设备为终端设备分配资源后，该终端设备可以切换到第一接入网设备。
其中，第一消息可以包括该终端设备的标识。该终端设备的标识为该终端设备在第二 接入网设备侧的标识。
示例性的，构成该终端设备的标识的内容可以包括下述中的一项或多项：
该终端设备在第二接入网设备的服务小区的频点、该终端设备在第二接入网设备的服务小区的PCI、该终端设备在第二接入网设备的服务小区为该终端设备分配的C-RNTI、终端设备在第二接入网设备与第二核心网设备之间的接口中的标识、终端设备的数据业务对应的协议数据单元(protocol data unit，PDU)会话在第二接入网设备与第二核心网设备之间的用户面传输隧道对应的传输层信息(比如隧道端口的IP地址和/或隧道端口标识)。
比如，该终端设备的标识可以是上述C-RNTI。又如，该终端设备的标识可以由上述频点、PCI和C-RNTI共同表示。
比如，终端设备在第二接入网设备与第二核心网设备之间的接口中的标识，可以是第二接入网设备分配的，也可以是第二核心网设备分配的。
应理解，该终端设备在第二接入网设备的服务小区是指，由第二接入网设备为该终端设备提供的服务小区。
以第二核心网设备为5GC中的控制面设备为例，第二接入网设备与第二核心网设备之间的接口为NG接口。终端设备在第二接入网设备与第二核心网设备之间的接口中的标识可以是RAN UE NGAP ID，第二接入网设备使用该标识在NG接口唯一关联了该终端设备。终端设备在第二接入网设备与第二核心网设备之间的接口中的标识也可以是AMF UE NGAP ID，第二核心网设备使用该标识在NG接口唯一关联了该终端设备。终端设备的数据业务对应的PDU会话在第二接入网设备与第二核心网设备之间的用户面传输隧道对应的传输层信息可以是PDU会话隧道在第二接入网设备侧的NG用户面传输层信息，例如GPRS隧道协议(GPRS tunneling protocol，GTP)隧道的端口IP地址和GTP隧道端口标识。
可选地，第一消息还可以包括第二接入网设备的标识。
下面结合两种场景对第一标识进行说明。
场景一：
第二接入网设备为该终端设备提供连接到第二核心网的服务时的标识和第二接入网设备为该终端设备提供连接到第一核心网的服务时的标识相同。
本文中，为便于理解，将场景一下第二接入网设备的标识记作：标识#1。
示例性的，构成标识#1的内容可以包括下述中的一项或多项：
第二接入网设备的全球基站标识(global RAN identifier)，第二接入网设备管理的小区的频点、第二接入网设备管理的小区的PCI、该终端设备在第二接入网设备的服务小区的PCI、该终端设备在第二接入网设备的服务小区的频点、该终端设备在第二接入网设备的服务小区的全球小区标识(cell global identifier,CGI)。
比如，全球基站标识可以包括公共陆地移动网(public land mobile network，PLMN)标识和基站标识，比如，全球基站标识可以由PLMN标识和基站标识共同表示。以第二接入网设备为5GC中的控制面设备为例，第二接入网设备的全球基站标识为第二接入网设备的global NodeB ID。.
比如，标识#1可以由第二接入网设备管理的小区的频点，以及第二接入网设备管理的小区的PCI共同表示。或者，标识#1可以由该终端设备在第二接入网设备的服务小区 的频点，以及该终端设备在第二接入网设备的服务小区的CGI共同表示。
场景二：
第二接入网设备为该终端设备提供连接到第二核心网的服务时的标识和第二接入网设备为该终端设备提供连接到第一核心网的服务时的标识不同。
在此场景下，有两种实现方式：
方式1：第二接入网设备的标识可以是第二接入网设备为该终端设备提供连接到第一核心网的服务时的标识。
方式2：第二接入网设备的标识可以是第二接入网设备为该终端设备提供连接到第二核心网的服务时的标识。
不同的实现方式对应的方法流程有所不同，后续步骤中将作详细说明。
本文中，为便于理解，将场景二下的方式1中的第二接入网设备的标识记作：标识#2；将场景二下的方式2中的第二接入网设备的标识记作：标识#3。
示例性的，构成标识#2的内容可以包括下述中的一项或多项：
第二接入网设备为该终端设备提供连接到第一核心网的服务时第二接入网设备的全球基站标识，第二接入网设备为该终端设备提供连接到第一核心网的服务时的第二接入网设备管理的小区的频点、第二接入网设备为该终端设备提供连接到第一核心网的服务时第二接入网设备管理的小区的PCI、第二接入网设备为该终端设备提供连接到第一核心网的服务时该终端设备在第二接入网设备的服务小区的PCI、第二接入网设备为该终端设备提供连接到第一核心网的服务时该终端设备在第二接入网设备的服务小区的频点、第二接入网设备为该终端设备提供连接到第一核心网的服务时该终端设备在第二接入网设备的服务小区的CGI。
比如，全球基站标识可以包括PLMN标识和基站标识。以第一网络系统为连接到4G核心网的系统为例，第二接入网设备的基站标识为en-gNB ID。
比如，标识#2可以由第二接入网设备为该终端设备提供连接到第一核心网的服务时第二接入网设备管理的所有小区的频点，以及第二接入网设备为该终端设备提供连接到第一核心网的服务时第二接入网设备管理的所有小区的PCI共同表示。
以第一核心网设备为EPC中的控制面设备，第二核心网设备为5GC中的控制面设备为例，第二接入网设备为该终端设备提供连接到第一核心网的服务时第二接入网设备的全球基站标识为第二接入网设备作为NSA组网中的接入网设备的全球基站标识global en-gNB ID。第二接入网设备为该终端设备提供连接到第一核心网的服务时的第二接入网设备管理的小区的频点为第二接入网设备作为NSA组网中的接入网设备管理的小区的频点。其他情况类似，这里不再一一说明。
示例性的，构成标识#3的内容可以包括下述中的一项或多项：
第二接入网设备为该终端设备提供连接到第二核心网的服务时第二接入网设备的全球基站标识，第二接入网设备为该终端设备提供连接到第二核心网的服务时的第二接入网设备管理的小区的频点、第二接入网设备为该终端设备提供连接到第二核心网的服务时第二接入网设备管理的小区的PCI、第二接入网设备为该终端设备提供连接到第二核心网的服务时该终端设备在第二接入网设备的服务小区的PCI、第二接入网设备为该终端设备提供连接到第二核心网的服务时该终端设备在第二接入网设备的服务小区的频点、第二接入 网设备为该终端设备提供连接到第二核心网的服务时该终端设备在第二接入网设备的服务小区的CGI。
比如，全球基站标识可以包括PLMN标识和基站标识。
仍以第一核心网设备为EPC中的控制面设备，第二核心网设备为5GC中的控制面设备为例，第二接入网设备为该终端设备提供连接到第二核心网的服务时第二接入网设备的全球基站标识为第二接入网设备作为SA下的接入网设备的全球基站标识global gNB ID。第二接入网设备为该终端设备提供连接到第二核心网的服务时的第二接入网设备管理的小区的频点为第二接入网设备作为SA下的接入网设备管理的小区的频点。其他情况类似，这里不再赘述。
可选地，第一消息可以是切换需求(handover required)消息，但本申请对此不作限定。
可选地，第二接入网设备的标识和/或该终端设备的标识可以通过切换需求消息中的源到目标透明容器(source to Target Transparent container)携带。
S402，第二核心网设备向第一核心网设备发送重定向请求(relocation request)消息。相应地，第一核心网设备接收该重定向请求消息。
该重定向请求消息用于请求第一接入网设备为终端设备分配资源。该重定向请求消息可以包括该终端设备的标识。
可选该，该定向请求消息还可以包括第二接入网设备的标识。
应理解，该重定向请求消息仅是一个示例性命名，该重定向请求消息也可以有其他命名。
可选地，第二接入网设备的标识和/或该终端设备的标识可以通过该重定向请求消息中的源到目标透明容器携带。
S403，第一核心网设备向第一接入网设备发送切换请求(handover request)消息。相应地，第一接入网设备接收该切换请求消息。
该切换请求消息用于请求将终端设备切换至第一接入网设备，并请求第一接入网设备为终端设备分配资源。该切换请求消息可以包括该终端设备的标识。
可选该，该切换请求消息还可以包括第二接入网设备的标识。
应理解，该切换请求消息仅是一个示例性命名，该切换请求消息也可以有其他命名。
可选地，第二接入网设备的标识和/或该终端设备的标识可以通过该切换请求消息中的源到目标透明容器携带。
S404，第一接入网设备确定为终端设备添加的辅接入网设备是第二接入网设备。
例如，第一接入网设备可以根据第二接入网设备的标识，确定为终端设备添加的辅接入网设备是第二接入网设备。或者，第一接入网设备可以根据切换请求消息中携带的切换之前的服务小区标识(比如在切换请求中携带了终端设备的移动历史信息，从终端设备的移动历史信息中可以获知终端设备切换之前的服务小区，或者切换请求中直接携带了切换之前的服务小区标识)，获知切换之前的第二接入网设备，从而确定为终端设备添加的辅接入网设备是第二接入网设备。
S405，第一接入网设备向第二接入网设备发送辅接入网设备增加请求消息。相应地，第二接入网设备接收辅接入网设备增加请求消息。
其中，该辅接入网设备增加请求消息包括该终端设备的标识。该辅接入网设备增加请求消息用于请求添加(或增加)第二接入网设备为该终端设备的辅接入网设备。
比如，在S404中，第一接入网设备可以在接收到切换请求消息后，确定将第二接入网设备的标识对应的第二接入网设备添加(或增加)为该终端设备的辅接入网设备。然后，执行S405。
又如，在S404中，第一接入网设备可以首先确定一个辅接入网设备，然后再根据第二接入网设备的标识，判断所确定的辅接入网设备是否为第二接入网设备。若第一接入网设备所确定的辅接入网设备为第二接入网设备，则执行S405。
下面结合S401中描述的两种场景，对S404进行举例说明。
针对场景一，由于第二接入网设备为该终端设备提供连接到第二核心网的服务时的标识和第二接入网设备为该终端设备提供连接到第一核心网的服务时的标识相同，因此第一接入网设备可以确定第二接入网设备的标识对应的接入网设备为第二接入网设备，从而确定为终端设备添加的辅接入网设备是第二接入网设备。
针对场景二中的方式1，第一接入网设备可以在接收到切换请求消息后，确定将第二接入网设备的标识对应的第二接入网设备添加为该终端设备的辅接入网设备。或者，第一接入网设备可以首先确定一个辅接入网设备，然后再比较所确定的辅接入网设备的标识是否为第二接入网设备的标识，若为第二接入网设备的标识，则可以确定辅接入网设备为第二接入网设备。
针对场景二中的方式2，第一接入网设备可以根据第二接入网设备的标识以及第一映射关系，确定为终端设备添加的辅接入网设备是第二接入网设备。其中，第一映射关系为第二接入网设备为该终端设备提供连接到第二核心网的服务时的标识和第二接入网设备为该终端设备提供连接到第一核心网的服务时的标识之间的映射关系。即，第一标识为标识#2和标识#3之间的映射关系。
具体来讲，第一接入网设备在接收到实际为标识#3的第二接入网设备的标识后，可以根据标识#2和标识#3的映射关系，确定标识#3对应标识#2。从而，第一接入网设备可以将标识#2所标识(或对应)的接入网设备(即，第二接入网设备)作为辅接入网设备。或者，第一接入网设备可以首先确定一个辅接入网设备，然后再比较所确定的辅接入网设备的标识是否为标识#2，若为标识#2，则确认为终端设备添加的辅接入网设备是第二接入网设备。
可选地，第一映射关系可以由第二接入网设备发送给第一接入网设备。
应理解，第二接入网设备可以在步骤S404之前发送第一映射关系。比如，在第二接入网设备与第一接入网设备之间建立Xn/X2接口连接时，第二接入网设备可以将第一映射关系发送给第一接入网设备。
示例性的，对于EN-DC，第一接入网设备和第二接入网设备之间可以通过EN-DC X2建立请求(Setup Request)或者EN-DC X2建立响应(Setup Response)消息携带第一映射关系。如果是第二接入网设备发起的EN-DC X2 Setup request，则在该消息中携带第一映射关系。如果是第一接入网设备发起的EN-DC X2 Setup request，则第二接入网设备在EN-DC X2 Setup Response中携带第一映射关系。
可选地，第二接入网设备的标识和第二标识的映射关系可以包括下述中的一项或多 项：
第二接入网设备为该终端设备提供连接到第一核心网的服务时的全球基站标识和第二接入网设备为该终端设备提供连接到第二核心网的服务时的全球基站标识之间的映射关系；
第二接入网设备为该终端设备提供连接到第一核心网的服务时第二接入网设备管理的小区的频点和第二接入网设备为该终端设备提供连接到第二核心网的服务时第二接入网设备管理的小区的频点之间的映射关系；
第二接入网设备为该终端设备提供连接到第一核心网的服务时第二接入网设备管理的小区的PCI和第二接入网设备为该终端设备提供连接到第二核心网的服务时第二接入网设备管理的小区的PCI之间的映射关系；
第二接入网设备为该终端设备提供连接到第一核心网的服务时该终端设备在第二接入网设备的服务小区的PCI和第二接入网设备为该终端设备提供连接到第二核心网的服务时该终端设备在第二接入网设备的服务小区的PCI之间的映射关系；
第二接入网设备为该终端设备提供连接到第一核心网的服务时该终端设备在第二接入网设备的服务小区的频点和第二接入网设备为该终端设备提供连接到第二核心网的服务时该终端设备在第二接入网设备的服务小区的频点之间的映射关系；
第二接入网设备为该终端设备提供连接到第一核心网的服务时该终端设备在第二接入网设备的服务小区的CGI和第二接入网设备为该终端设备提供连接到第二核心网的服务时该终端设备在第二接入网设备的服务小区的CGI之间的映射关系。
需要说明的是，在实践中，第一接入网设备也可以选择不同于第二接入网设备的其他接入网设备作为辅接入网设备。
第二接入网设备接收到辅接入网设备增加请求消息后，若根据该终端设备的标识，确定该终端设备是该辅接入网设备正在服务(或者说，切换之前)的终端设备，则可以忽略终结于第二接入网设备的承载对应的数据的转移。也就是说，对于终结于第二接入网设备的承载对应的数据，第二接入网不需要先发送给第二核心网，再由第二核心网转给第一核心网，由第一核心网发送给第二接入网，也不需要先发送给第一接入网设备，再由第一接入网设备转给第二接入网设备。
应理解，终结于第二接入网设备的承载可以包括终结于第二接入网设备的SCG承载、终结于第二接入网设备的分离承载和终结于第二接入网设备的MCG承载。
综上，根据本申请提供的方法，第二接入网设备可以在切换过程中向第一接入网设备提供将要执行切换流程的终端设备的标识，在第一接入网设备确定目标辅接入网设备(即，上文中的辅接入网设备)与源接入网设备(即，第二接入网设备)为同一接入网设备的情况下，通过向源接入网设备提供该终端设备的标识，可以使得源接入网设备对终结于源接入网设备的承载对应的数据不进行数据转移，从而能够减低数据传输时延。
可选地，该方法还可以包括步骤S406至S413中的部分或全部步骤。
S406，第二接入网设备向第一接入网设备发送辅接入网设备增加响应消息。
相应地，第一接入网设备接收辅接入网设备增加响应消息。
第二接入网设备接收到辅接入网设备增加请求消息后，若同意作为该终端设备的辅接入网设备，则向第一接入网设备发送辅接入网设备增加响应消息。
应理解，第一接入网设备将作为该终端设备的主接入网设备。
S407，第一接入网设备向第一核心网设备发送切换请求确认消息。
可选的，该切换请求确认消息可以包括保持终端设备上下文的指示信息。
可选地，该终端设备上下文的指示信息可以通过该切换请求确认消息中的目标到源透明容器(Target to source Transparent container)携带。
S408，第一核心网设备向第二核心网设备发送重定向响应消息。
应理解，该重定向响应消息用于响应上述中的重定向请求消息。
可选的，该重定向响应消息可以包括保持终端设备上下文的指示信息。
可选地，该终端设备上下文的指示信息可以通过该重定向响应消息中的目标到源透明容器携带。
S409，第二核心网设备向第二接入网设备发送切换命令。
应理解，该切换命令用于响应上述中的第一消息。
可选的，该切换命令可以包括保持终端设备上下文的指示信息。
可选地，该终端设备上下文的指示信息可以通过该切换命令中的目标到源透明容器携带。
S410，第二接入网设备向该终端设备发送RRC消息。
所述RRC消息用于通知终端设备切换到第一接入网设备。
比如在从NR切换到EN-DC场景中，该RRC消息可以为来自NR的移动命令mobilityfromNRCommand。
S411，该终端设备和第一接入网设备执行随机接入流程。
S412，该终端设备向第一接入网设备向发送RRC连接重配完成(RRC connection reconfiguration complete)消息。
经过步骤S410至S412，该终端设备可以接入第一接入网设备，并且第二接入网设备可以为终端设备提供连接到第一核心网的服务。
关于步骤S410至S412的具体内容，可以参见现有技术。
S413，该终端设备和第二接入网设备执行随机接入过程。
该步骤可以执行，也可以不执行。该步骤主要作用是终端设备接入第二接入网设备，第二接入网设备为终端设备调整上行定时，以避免第二接入网设备服务的终端设备之间的干扰。
S414，第一接入网设备向第二接入网设备发送辅接入网设备重配完成消息。
S415，第二接入网设备发起数据转移(data forwarding)。
即，第二接入网设备向第一接入网设备发送(切换后属于)终结于第一接入网设备的承载对应的数据。这些数据包括第二接入网设备已经从第二核心网接收的数据或/和后续将从第二核心网接收的数据。第二接入网设备可以直接把这些数据发送给第一接入网设备，也可以先发送给第二核心网，再由第二核心网转给第一核心网，由第一核心网发送给第一接入网设备。
应理解，终结于第一接入网设备的承载可以包括终结于第一接入网设备的SCG承载、终结于第一接入网设备的分离承载和终结于第一接入网设备的MCG承载。
还应理解，S415也可以在S409之后执行。
S416，第一接入网设备向第一核心网设备发送切换通知消息。
该切换通知消息用于通知第一核心网设备，该终端设备在第一接入网设备的切换已经完成。
在此之后，第一核心网设备可以向第一核心网用户面设备发送承载修改消息。
比如，第一核心网设备为EPC中的控制面设备时，第一核心网用户面设备为S-GW。
该承载修改消息用于通知终端设备已经接入到目标侧设备，第一核心网用户面设备就可以通知第二核心网的用户面设备可以停止向第二接入网设备发送数据。
S417，第二接入网设备和终端设备之间进行数据传输。
比如，若第二核心网设备为5GC中的控制面设备，第一核心网设备为EPC中的控制面设备，则第二接入网设备可以根据QoS流与E-RAB之间的映射关系，将从第二核心网设备接收到的QoS流的数据包映射到切换后的E-RAB对应的DRB上发送给该终端设备。
又如，若第一核心网设备为5GC中的控制面设备，第二核心网设备为EPC中的控制面设备，则第二接入网设备可以根据QoS流与E-RAB之间的映射关系，将从第二核心网设备接收到的E-RAB的数据包映射到切换后的QoS流对应的DRB上发送给该终端设备。
可选的，第二接入网设备在和终端设备进行数据传输时，为了使得第二接入网设备与终端设备之间的数据传输不中断，第二接入网设备在切换过程中可以继续与终端设备进行通信。第二接入网设备继续使用切换前的密钥与终端设备进行数据通信，同时第二接入网设备使用切换后的密钥(即作为辅接入网设备的密钥)与该终端设备进行数据通信。
比如，方案一：第二接入网设备采用切换前的密钥，在第一DRB传输从第第二核心网接收到的数据包，并且，第二接入网设备采用切换后的密钥，在第二DRB上传输终结于第二接入网设备的承载对应数据包(从第一核心网接收到的数据包)。第一DRB可以是一个或多个DRB，第二DRB可以是一个或多个DRB，第一DRB与第二DRB没有交集。
方案二：第二接入网设备先用切换前的密钥，在一个或多个DRB上传输从第二核心网接收到的数据包。在第二接入网设备都把这些数据发送给终端设备后，再采用切换后的密钥，在该一个或多个DRB上传输终结于第二接入网设备的承载对应数据包(从第一核心网接收到的数据包)。
方案三：第二接入网设备在一个DRB中建立两个逻辑信道。并且，第二接入网设备采用切换前的密钥，在其中一个逻辑信道上传输从第二核心网接收到的数据包，采用切换后的密钥，在另一个逻辑信道上传输终结于第二接入网设备的承载对应数据包(从第一核心网接收到的数据包)。
应理解，本申请并不限定上述步骤之间的先后顺序。方法400中步骤编号的大小并不代表方法的实际执行顺序。在实践中，并非需要执行方法400中的全部步骤，并且步骤之间的先后顺序也可能和图4所示的顺序有所不同。
以上，结合图4详细说明了本申请实施例提供的方法。以下，结合图5至图7详细说明本申请实施例提供的装置。
图5是本申请实施例提供的通信装置的示意性框图。如图5所示，该通信装置1000可以包括收发单元1100和处理单元1200。
其中，收发单元1100可以用于向其他装置发送信息或从其他装置接收信息。比如， 发送或接收辅接入网设备增加请求消息。处理单元1200可以用于进行装置的内部处理，比如，确定为终端设备添加的辅接入网设备是第二接入网设备。
在一种实现方式中，该通信装置1000可对应于第一接入网设备。该通信装置1000可以为第一接入网设备或配置于第一接入网设备中的芯片，其可以包括用于执行第一接入网设备所执行的操作的单元，并且，该通信装置1000中的各单元分别为了实现上述方法中由第一接入网设备所执行的操作。
具体地，收发单元1100用于，接收来自第一核心网设备的切换请求消息，所述切换请求消息包括终端设备的标识，所述装置为所述终端设备提供连接到所述第一核心网的服务，所述第一核心网设备属于所述第一核心网；处理单元1200，用于确定为所述终端设备添加的辅接入网设备是第二接入网设备，所述第二接入网设备为所述终端设备提供连接到第二核心网的服务；所述收发单元1100还用于，向所述第二接入网设备发送辅接入网设备增加请求消息，所述辅接入网设备增加请求消息包括所述终端设备的标识。
可选地，所述终端设备的标识为所述终端设备在所述第二接入网设备的服务小区为所述终端设备分配的小区无线网络临时标识C-RNTI，或者所述终端设备的标识为所述终端设备在所述第二接入网设备与第二核心网设备之间的接口中的标识，所述第二核心网设备属于所述第二核心网。
可选地，所述切换请求消息还包括所述第二接入网设备的标识。
可选地，所述第二接入网设备的标识为所述第二接入网设备为所述终端设备提供连接到所述第一核心网的服务时的标识。
可选地，所述第二接入网设备的标识为所述第二接入网设备为所述终端设备提供连接到所述第二核心网的服务时的标识。
可选地，所述收发单元1100还用于：接收来自所述第二接入网设备的第一映射关系，所述第一映射关系为所述第二接入网设备为所述终端设备提供连接到所述第一核心网的服务时的标识和第二接入网设备为所述终端设备提供连接到所述第二核心网的服务时的标识之间的映射关系；其中，所述处理单元1200具体用于：根据所述第二接入网设备的标识以及所述第一映射关系，确定为所述终端设备添加的辅接入网设备是所述第二接入网设备。
在另一种实现方式中，该通信装置1000可对应于第二接入网设备。该通信装置1000可以为第二接入网设备或配置于第二接入网设备中的芯片，其可以包括用于执行第二接入网设备所执行的操作的单元，并且，该通信装置1000中的各单元分别为了实现上述方法中由第二接入网设备所执行的操作。
具体地，收发单元1100用于，向第二核心网设备发送第一消息，所述第一消息包括终端设备的标识，所述装置为所述终端设备提供连接到第二核心网的服务，所述第二核心网设备属于所述第二核心网，所述第一消息用于请求第一接入网设备为所述终端设备分配资源，所述第一接入网设备为所述终端设备提供连接到第一核心网的服务；所述收发单元1100还用于，接收来自所述第一接入网设备的辅接入网设备增加请求消息，所述第一接入网设备为所述终端设备的主接入网设备，所述辅接入网设备增加请求消息包括所述终端设备的标识，所述辅接入网设备增加请求消息用于请求添加所述装置为所述终端设备的辅接入网设备。
可选地，所述终端设备的标识为所述终端设备在所述装置的服务小区为所述终端设备分配的小区无线网络临时标识C-RNTI，或者所述终端设备的标识为所述终端设备在所述装置与所述第二核心网设备之间的接口中的标识。
可选地，所述第一消息还包括所述装置的标识。
可选地，所述第二接入网设备的标识为所述装置为所述终端设备提供连接到所述第一核心网的服务时的标识。
可选地，所述第二接入网设备的标识为所述装置为所述终端设备提供连接到所述第二核心网的服务时的标识。
可选地，所述收发单元1100还用于：向所述第一接入网设备发送第一映射关系，所述第一映射关系为所述装置为所述终端设备提供连接到所述第一核心网的服务时的标识和装置为所述终端设备提供连接到所述第二核心网的服务时的标识之间的映射关系。
可选地，所述收发单元1100还用于：向所述第一接入网设备发送终结于所述第一接入网设备的承载对应的数据。
可选地，所述处理单元1200用于，忽略终结于所述装置的承载对应的数据的转移。
可选地，所述处理单元还1200用于，根据服务质量QoS流与演进的通用陆地无线接入网络的无线接入承载E-RAB之间的映射关系，将从所述第二核心网设备接收到的QoS流的数据包映射到切换后的E-RAB对应的数据无线承载DRB上；所述发送单元1100还用于，向所述终端设备发送所述映射到所述切换后的E-RAB对应的数据无线承载DRB上的数据包。
在又一种实现方式中，该通信装置1000可对应于第一核心网设备。该通信装置1000可以为第一核心网设备或配置于第一核心网设备中的芯片，其可以包括用于执行第一核心网设备所执行的操作的单元，并且，该通信装置1000中的各单元分别为了实现上述方法中由第一核心网设备所执行的操作。
具体地，收发单元1100用于，接收来自第二接入网设备的第一消息；收发单元1100还用于，根据第一消息，向第一核心网设备发送重定向请求消息。其中，第一消息包括终端设备的标识，第一消息用于请求第一接入网设备为该终端设备分配资源。该重定向请求消息包括该终端设备的标识。第二接入网设备为该终端设备提供连接到第二核心网的服务，第一接入网设备为该终端设备提供连接到第一核心网的服务。装置1000属于第二核心网，第一核心网设备属于第一核心网。
在又一种实现方式中，该通信装置1000可对应于第二核心网设备。该通信装置1000可以为第二核心网设备或配置于第二核心网设备中的芯片，其可以包括用于执行第二核心网设备所执行的操作的单元，并且，该通信装置1000中的各单元分别为了实现上述方法中由第二核心网设备所执行的操作。
具体地，收发单元1100用于，接收来自第二核心网设备从接收重定向请求消息，该重定向请求消息包括终端设备的标识，第二接入网设备为该终端设备提供连接到第二核心网的服务，第一接入网设备为该终端设备提供连接到第一核心网的服务；所述收发单元还用于，向第一接入网设备发送切换请求消息，该切换请求消息包括该终端设备的标识。第二核心网设备属于第二核心网，装置1000属于第一核心网。
应理解，各单元执行相应网元的上述相应步骤的具体过程在上述方法实施例中已经详 细说明，为了简洁，在此不再赘述。
还应理解，该通信装置1000为第一接入网设备或第二接入网设备时，该通信装置1000中的收发单元1100可对应于图6中示出的接入网设备2000中的RRU 2100，该通信装置1000中的处理单元1200可对应于图6中示出的接入网设备2000中的BBU 2200。通信装置1000为配置于第一接入网设备或第二接入网设备中的芯片时，该通信装置1000中的收发单元1100可以为输入/输出接口。
还应理解，该通信装置1000为第一核心网设备或第二核心网设备时，该通信装置1000中的收发单元1100可对应于图7中示出的通信装置3000中的收发器3002，该通信装置1000中的处理单元1200可对应于图7中示出的通信装置3000中的处理器3001。
图6是本申请实施例提供的接入网设备的结构示意图，例如可以为基站的结构示意图。该基站2000可应用于如图3所示的系统中，执行上述方法实施例中第一接入网设备或第二接入网设备的功能。如图所示，该基站2000可以包括一个或多个射频单元，如远端射频单元(remote radio unit，RRU)2100和一个或多个基带单元(BBU)(也可称为分布式单元(DU))2200。所述RRU 2100可以称为收发单元或通信单元，与图5中的收发单元1100对应。可选地，该收发单元2100还可以称为收发机、收发电路、或者收发器等等，其可以包括至少一个天线2101和射频单元2102。可选地，收发单元2100可以包括接收单元和发送单元，接收单元可以对应于接收器(或称接收机、接收电路)，发送单元可以对应于发射器(或称发射机、发射电路)。所述RRU 2100部分主要用于射频信号的收发以及射频信号与基带信号的转换。所述BBU 2200部分主要用于进行基带处理，对基站进行控制等。所述RRU 2100与BBU 2200可以是物理上设置在一起，也可以物理上分离设置的，即分布式基站。
所述BBU 2200为基站的控制中心，也可以称为处理单元，可以与图5中的处理单元1200对应，主要用于完成基带处理功能，如信道编码，复用，调制，扩频等等。例如所述BBU(处理单元)可以用于控制基站执行上述方法实施例中关于接入网设备的操作流程。
在一个示例中，所述BBU 2200可以由一个或多个单板构成，多个单板可以共同支持单一接入制式的无线接入网(如LTE网)，也可以分别支持不同接入制式的无线接入网(如LTE网，5G网或其他网)。所述BBU 2200还包括存储器2201和处理器2202。所述存储器2201用以存储必要的指令和数据。所述处理器2202用于控制基站进行必要的动作，例如用于控制基站执行上述方法实施例中关于接入网设备的操作流程。所述存储器2201和处理器2202可以服务于一个或多个单板。也就是说，可以每个单板上单独设置存储器和处理器。也可以是多个单板共用相同的存储器和处理器。此外每个单板上还可以设置有必要的电路。
应理解，图6所示的基站2000能够实现前述方法实施例中涉及第一接入网设备或第二接入网设备的各个过程。基站2000中的各个模块的操作或功能，分别为了实现上述方法实施例中的相应流程。具体可参见上述方法实施例中的描述，为避免重复，此处适当省略详细描述。
上述BBU 2200可以用于执行前面方法实施例中描述的由第一接入网设备或第二接入网设备内部实现的动作，而RRU 2100可以用于执行前面方法实施例中描述的第一接入网 设备或第二接入网设备发送或接收的动作。具体请见前面方法实施例中的描述，此处不再赘述。
图7是本申请实施例提供的通信装置3000的结构示意图。如图7所示，该通信装置3000包括处理器3001和收发器3002。可选地，该通信装置3000还可以包括存储器3003。其中，处理器3001、收发器3002和存储器3003之间可以通过内部连接通路互相通信，传递控制和/或数据信号。该存储器3003用于存储计算机程序，该处理器3001用于从该存储器3003中调用并运行该计算机程序，以实现上述方法实施例。
上述处理器3001和存储器3003可以合成一个处理装置。应理解，该存储器3003也可以集成在处理器3001中，或者独立于处理器3001。本申请对此不做限定。
作为一种实现方式，该通信装置3000用于执行上文方法实施例中第一核心网设备所执行的动作，这时，对存储器3003中存储的程序的执行，使得处理器3001用于执行上文方法实施例中第一核心网设备侧的内部处理操作(如，确定步骤)，对存储器3003中存储的程序的执行，使得处理器3001控制收发器3002执行上文方法实施例中第一核心网设备侧的接收和发送步骤。
作为一种实现方式，该通信装置3000用于执行上文方法实施例中第二核心网设备所执行的动作，这时，对存储器3003中存储的程序的执行，使得处理器3001用于执行上文方法实施例中第二核心网设备侧的内部处理操作(如，确定步骤)，对存储器3003中存储的程序的执行，使得处理器3001控制收发器3002执行上文方法实施例中第二核心网设备侧的接收和发送步骤。
应理解，所述处理装置或处理器可以是一个芯片。例如，该处理装置或处理器可以是现场可编程门阵列(field programmable gate array，FPGA)，可以是通用处理器、数字信号处理器(digital signal processor，DSP)、专用集成电路(application specific integrated circuit，ASIC)、现成可编程门阵列(field programmable gate array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件，还可以是系统芯片(system on chip，SoC)，还可以是中央处理器(central processor unit，CPU)，还可以是网络处理器(network processor，NP)，还可以是数字信号处理电路(digital signal processor，DSP)，还可以是微控制器(micro controller unit，MCU)，还可以是可编程控制器(programmable logic device，PLD)或其他集成芯片。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件译码处理器执行完成，或者用译码处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器，处理器读取存储器中的信息，结合其硬件完成上述方法的步骤。
所述存储器3003可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(read-only memory，ROM)、可编程只读存储器(programmable ROM，PROM)、可擦除可编程只读存储器(erasable PROM，EPROM)、电可擦除可编程只读存储器(electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(random access memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的RAM可用，例如静态随机存取存 储器(static RAM，SRAM)、动态随机存取存储器(dynamic RAM，DRAM)、同步动态随机存取存储器(synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(double data rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(synchlink DRAM，SLDRAM)和直接内存总线随机存取存储器(direct rambus RAM，DR RAM)。
应注意，本文描述的系统和方法的存储器旨在包括但不限于这些和任意其它适合类型的存储器。
本申请还提供一种计算机程序产品，该计算机程序产品包括：计算机程序代码，当该计算机程序代码在计算机上运行时，使得该计算机执行前述方法实施例中由第一接入网设备、第二接入网设备、第一核心网设备或第二核心网设备所执行的方法。
本申请还提供一种计算机可读介质，该计算机可读介质存储有程序代码，当该程序代码在计算机上运行时，使得该计算机执行前述方法实施例中由第一接入网设备、第二接入网设备、第一核心网设备或第二核心网设备所执行的方法。
本申请还提供一种系统，其包括第一接入网设备、第二接入网设备、第一核心网设备和第二核心网设备中的至少两项。
本申请实施例还提供了一种处理装置，包括处理器和接口；所述处理器用于执行上述任一方法实施例所涉及的第一接入网设备、第二接入网设备、第一核心网设备或第二核心网设备所执行的方法。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)、光介质(例如，高密度数字视频光盘(digital video disc，DVD))、或者半导体介质(例如，固态硬盘(solid state disc，SSD))等。
在本说明书中使用的术语“部件”、“模块”、“系统”等用于表示计算机相关的实体、硬件、固件、硬件和软件的组合、软件、或执行中的软件。例如，部件可以是但不限于，在处理器上运行的进程、处理器、对象、可执行文件、执行线程、程序或计算机。通过图示，在计算设备上运行的应用和计算设备都可以是部件。一个或多个部件可驻留在进程或执行线程中，部件可位于一个计算机上或分布在2个或更多个计算机之间。此外，这些部件可从在上面存储有各种数据结构的各种计算机可读介质执行。部件可例如根据具有一个或多个数据分组(例如来自与本地系统、分布式系统或网络间的另一部件交互的二个部件的数据，例如通过信号与其它系统交互的互联网)的信号通过本地或远程进程来通信。
应理解，说明书通篇中提到的“实施例”意味着与实施例有关的特定特征、结构或特性包括在本申请的至少一个实施例中。因此，在整个说明书各个实施例未必一定指相同的实施例。此外，这些特定的特征、结构或特性可以任意适合的方式结合在一个或多个实施例中。
应理解，在本申请实施例中，编号“第一”、“第二”…仅仅为了区分不同的对象，比如为了区分不同的网络设备，并不对本申请实施例的范围构成限制，本申请实施例并不限于此。
还应理解，在本申请中，“当…时”、“若”以及“如果”均指在某种客观情况下网元会做出相应的处理，并非是限定时间，且也不要求网元实现时一定要有判断的动作，也不意味着存在其它限定。
还应理解，在本申请中，“至少一个”是指一个或者多个，“多个”是指两个或两个以上。
还应理解，在本申请各实施例中，“A对应的B”表示B与A相关联，根据A可以确定B。但还应理解，根据A确定B并不意味着仅仅根据A确定B，还可以根据A和/或其它信息确定B。
还应理解，本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
本申请中出现的类似于“项目包括如下中的一项或多项：A，B，以及C”表述的含义，如无特别说明，通常是指该项目可以为如下中任一个：A；B；C；A和B；A和C；B和C；A，B和C；A和A；A，A和A；A，A和B；A，A和C，A，B和B；A，C和C；B和B，B，B和B，B，B和C，C和C；C，C和C，以及其他A，B和C的组合。以上是以A，B和C共3个元素进行举例来说明该项目的可选用条目，当表达为“项目包括如下中至少一种：A，B，……，以及X”时，即表达中具有更多元素时，那么该项目可以适用的条目也可以按照前述规则获得。
可以理解的，本申请实施例中，终端设备和/或网络设备可以执行本申请实施例中的部分或全部步骤，这些步骤或操作仅是示例，本申请实施例还可以执行其它操作或者各种操作的变形。此外，各个步骤可以按照本申请实施例呈现的不同的顺序来执行，并且有可能并非要执行本申请实施例中的全部操作。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显 示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器ROM、随机存取存储器RAM、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (35)

  1. 一种系统间切换方法，其特征在于，包括：
    第一接入网设备接收来自第一核心网设备的切换请求消息，所述切换请求消息包括终端设备的标识，所述第一接入网设备为所述终端设备提供连接到所述第一核心网的服务，所述第一核心网设备属于所述第一核心网；
    所述第一接入网设备确定将第二接入网设备添加为所述终端设备的辅接入网设备，所述第二接入网设备在作为所述辅接入网设备之前为所述终端设备提供连接到第二核心网的服务；
    所述第一接入网设备向所述第二接入网设备发送辅接入网设备增加请求消息，所述辅接入网设备增加请求消息包括所述终端设备的标识。
  2. 如权利要求1所述的方法，其特征在于，所述终端设备的标识为所述终端设备在所述第二接入网设备的服务小区为所述终端设备分配的小区无线网络临时标识C-RNTI，或者所述终端设备的标识为所述终端设备在所述第二接入网设备与第二核心网设备之间的接口中的标识，所述第二核心网设备属于所述第二核心网。
  3. 如权利要求1或2所述的方法，其特征在于，所述切换请求消息还包括所述第二接入网设备的标识。
  4. 如权利要求3所述的方法，其特征在于，所述第二接入网设备的标识为所述第二接入网设备为所述终端设备提供连接到所述第一核心网的服务时的标识。
  5. 如权利要求3所述的方法，其特征在于，所述第二接入网设备的标识为所述第二接入网设备为所述终端设备提供连接到所述第二核心网的服务时的标识。
  6. 如权利要求5所述的方法，其特征在于，在所述第一接入网设备向所述第二接入网设备发送辅接入网设备增加请求消息之前，所述方法还包括：
    所述第一接入网设备接收来自所述第二接入网设备的第一映射关系，所述第一映射关系为所述第二接入网设备为所述终端设备提供连接到所述第一核心网的服务时的标识和第二接入网设备为所述终端设备提供连接到所述第二核心网的服务时的标识之间的映射关系；
    其中，所述第一接入网设备确定为所述终端设备添加的辅接入网设备是所述第二接入网设备，包括：
    所述第一接入网设备根据所述第二接入网设备的标识以及所述第一映射关系，确定为所述终端设备添加的辅接入网设备是所述第二接入网设备。
  7. 一种系统间切换方法，其特征在于，包括：
    第二接入网设备向第二核心网设备发送第一消息，所述第一消息包括终端设备的标识，所述第二接入网设备为所述终端设备提供连接到所述第二核心网的服务，所述第二核心网设备属于所述第二核心网，所述第一消息用于请求第一接入网设备为所述终端设备分配资源，所述第一接入网设备为所述终端设备提供连接到第一核心网的服务；
    所述第二接入网设备接收来自所述第一接入网设备的辅接入网设备增加请求消息，所述第一接入网设备为所述终端设备的主接入网设备，所述辅接入网设备增加请求消息包括 所述终端设备的标识，所述辅接入网设备增加请求消息用于请求添加所述第二接入网设备为所述终端设备的辅接入网设备。
  8. 如权利要求7所述的方法，其特征在于，所述终端设备的标识为所述终端设备在所述第二接入网设备的服务小区为所述终端设备分配的小区无线网络临时标识C-RNTI，或者所述终端设备的标识为所述终端设备在所述第二接入网设备与所述第二核心网设备之间的接口中的标识。
  9. 如权利要求7或8所述的方法，其特征在于，所述第一消息还包括所述第二接入网设备的标识。
  10. 如权利要求9所述的方法，其特征在于，所述第二接入网设备的标识为所述第二接入网设备为所述终端设备提供连接到所述第一核心网的服务时的标识。
  11. 如权利要求9所述的方法，其特征在于，所述第二接入网设备的标识为所述第二接入网设备为所述终端设备提供连接到所述第二核心网的服务时的标识。
  12. 如权利要求11所述的方法，其特征在于，在所述第二接入网设备接收来自所述第一接入网设备的辅接入网设备增加请求消息之前，所述方法还包括：
    所述第二接入网设备向所述第一接入网设备发送第一映射关系，所述第一映射关系为所述第二接入网设备为所述终端设备提供连接到所述第一核心网的服务时的标识和第二接入网设备为所述终端设备提供连接到所述第二核心网的服务时的标识之间的映射关系。
  13. 如权利要求7至12中任一项所述的方法，其特征在于，所述方法还包括：
    所述第二接入网设备向所述第一接入网设备发送终结于所述第一接入网设备的承载对应的数据。
  14. 如权利要求7至13中任一项所述的方法，其特征在于，所述方法还包括：
    所述第二接入网设备忽略终结于所述第二接入网设备的承载对应的数据的转移。
  15. 如权利要求7至14中任一项所述的方法，其特征在于，所述方法还包括：
    所述第二接入网设备根据服务质量QoS流与演进的通用陆地无线接入网络的无线接入承载E-RAB之间的映射关系，将从所述第二核心网设备接收到的QoS流的数据包映射到切换后的E-RAB对应的数据无线承载DRB上发送。
  16. 一种通信装置，其特征在于，包括：
    收发单元，用于接收来自第一核心网设备的切换请求消息，所述切换请求消息包括终端设备的标识，所述装置为所述终端设备提供连接到所述第一核心网的服务，所述第一核心网设备属于所述第一核心网；
    处理单元，用于确定将第二接入网设备添加为所述终端设备添加的辅接入网设备，所述第二接入网设备在作为所述辅接入网设备之前为所述终端设备提供连接到第二核心网的服务；
    所述收发单元还用于，向所述第二接入网设备发送辅接入网设备增加请求消息，所述辅接入网设备增加请求消息包括所述终端设备的标识。
  17. 如权利要求16所述的装置，其特征在于，所述终端设备的标识为所述终端设备在所述第二接入网设备的服务小区为所述终端设备分配的小区无线网络临时标识C-RNTI，或者所述终端设备的标识为所述终端设备在所述第二接入网设备与第二核心网设备之间的接口中的标识，所述第二核心网设备属于所述第二核心网。
  18. 如权利要求16或17所述的装置，其特征在于，所述切换请求消息还包括所述第二接入网设备的标识。
  19. 如权利要求18所述的装置，其特征在于，所述第二接入网设备的标识为所述第二接入网设备为所述终端设备提供连接到所述第一核心网的服务时的标识。
  20. 如权利要求18所述的装置，其特征在于，所述第二接入网设备的标识为所述第二接入网设备为所述终端设备提供连接到所述第二核心网的服务时的标识。
  21. 如权利要求20所述的装置，其特征在于，所述收发单元还用于：
    接收来自所述第二接入网设备的第一映射关系，所述第一映射关系为所述第二接入网设备为所述终端设备提供连接到所述第一核心网的服务时的标识和第二接入网设备为所述终端设备提供连接到所述第二核心网的服务时的标识之间的映射关系；
    其中，所述处理单元具体用于：
    根据所述第二接入网设备的标识以及所述第一映射关系，确定为所述终端设备添加的辅接入网设备是所述第二接入网设备。
  22. 一种通信装置，其特征在于，包括：
    收发单元，用于向第二核心网设备发送第一消息，所述第一消息包括终端设备的标识，所述装置为所述终端设备提供连接到第二核心网的服务，所述第二核心网设备属于所述第二核心网，所述第一消息用于请求第一接入网设备为所述终端设备分配资源，所述第一接入网设备为所述终端设备提供连接到第一核心网的服务；
    所述收发单元还用于，接收来自所述第一接入网设备的辅接入网设备增加请求消息，所述第一接入网设备为所述终端设备的主接入网设备，所述辅接入网设备增加请求消息包括所述终端设备的标识，所述辅接入网设备增加请求消息用于请求添加所述装置为所述终端设备的辅接入网设备。
  23. 如权利要求22所述的装置，其特征在于，所述终端设备的标识为所述终端设备在所述装置的服务小区为所述终端设备分配的小区无线网络临时标识C-RNTI，或者所述终端设备的标识为所述终端设备在所述装置与所述第二核心网设备之间的接口中的标识。
  24. 如权利要求22或23所述的装置，其特征在于，所述第一消息还包括所述装置的标识。
  25. 如权利要求24所述的装置，其特征在于，所述第二接入网设备的标识为所述装置为所述终端设备提供连接到所述第一核心网的服务时的标识。
  26. 如权利要求24所述的装置，其特征在于，所述第二接入网设备的标识为所述装置为所述终端设备提供连接到所述第二核心网的服务时的标识。
  27. 如权利要求26所述的装置，其特征在于，所述收发单元还用于：
    向所述第一接入网设备发送第一映射关系，所述第一映射关系为所述装置为所述终端设备提供连接到所述第一核心网的服务时的标识和装置为所述终端设备提供连接到所述第二核心网的服务时的标识之间的映射关系。
  28. 如权利要求22至27中任一项所述的装置，其特征在于，所述收发单元还用于：
    向所述第一接入网设备发送终结于所述第一接入网设备的承载对应的数据。
  29. 如权利要求22至28中任一项所述的装置，其特征在于，所述装置还包括：
    处理单元，用于忽略终结于所述装置的承载对应的数据的转移。
  30. 如权利要求29所述的装置，其特征在于，所述处理单元还用于：
    根据服务质量QoS流与演进的通用陆地无线接入网络的无线接入承载E-RAB之间的映射关系，将从所述第二核心网设备接收到的QoS流的数据包映射到切换后的E-RAB对应的数据无线承载DRB上；
    所述发送单元还用于，向所述终端设备发送所述映射到所述切换后的E-RAB对应的数据无线承载DRB上的数据包。
  31. 一种通信装置，包括存储器和处理器，其中，所述存储器存储在所述处理器上运行的程序，其特征在于，所述处理器执行所述程序时实现权利要求1至6中任一项所述的通信方法。
  32. 一种通信装置，包括存储器和处理器，其中，所述存储器存储在所述处理器上运行的程序，其特征在于，所述处理器执行所述程序时实现权利要求7至15中任一项所述的通信方法。
  33. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质存储有计算机程序，当所述计算机程序被运行时，实现如权利要求1至15中任一项所述的通信方法。
  34. 一种芯片，其特征在于，包括处理器，所述处理器与存储器相连，所述存储器用于存储计算机程序，所述处理器用于执行所述存储器中存储的计算机程序，以使得所述芯片执行如权利要求1至15中任一项所述的通信方法。
  35. 一种通信系统，其特征在于，包括第一接入网设备以及第二接入网设备，其中，所述第一接入网设备执行如权利要求1至6中任一项所述的通信方法，所述第二接入网设备执行如权利要求7至15中任一项所述的通信方法。
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105848222A (zh) * 2015-01-16 2016-08-10 北京三星通信技术研究有限公司 切换方法和设备
CN108617025A (zh) * 2016-12-30 2018-10-02 华为技术有限公司 一种双连接方法及接入网设备
WO2019159136A1 (en) * 2018-02-15 2019-08-22 Telefonaktiebolaget Lm Ericsson (Publ) Method for inter-radio access technology handover
WO2020030676A1 (en) * 2018-08-09 2020-02-13 Telefonaktiebolaget Lm Ericsson (Publ) Inter-system handover from single/dual connectivity systems to dual connectivity systems

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9913287B2 (en) * 2013-07-19 2018-03-06 Sharp Kabushiki Kaisha Terminal apparatus, base station apparatus, and control methods for secondary cells
EP3241384B1 (en) * 2014-12-30 2019-07-24 LG Electronics Inc. Method and apparatus for performing inter-menb handover without senb change in a wireless communication system
CN105992292A (zh) * 2015-02-13 2016-10-05 中兴通讯股份有限公司 异构网中的基站切换方法与基站
EP3603180B1 (en) * 2017-03-23 2020-09-02 Telefonaktiebolaget LM Ericsson (PUBL) Inter-system handover
JP7077686B2 (ja) * 2018-03-15 2022-05-31 日本電気株式会社 第１の基地局、第２の基地局、及び方法
US11184821B2 (en) * 2018-08-09 2021-11-23 Qualcomm Incorporated Inter-system handover between standalone mode and non-standalone mode
CN109600805B (zh) * 2018-12-21 2021-02-23 华为技术服务有限公司 通信方法及装置、系统

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105848222A (zh) * 2015-01-16 2016-08-10 北京三星通信技术研究有限公司 切换方法和设备
CN108617025A (zh) * 2016-12-30 2018-10-02 华为技术有限公司 一种双连接方法及接入网设备
WO2019159136A1 (en) * 2018-02-15 2019-08-22 Telefonaktiebolaget Lm Ericsson (Publ) Method for inter-radio access technology handover
WO2020030676A1 (en) * 2018-08-09 2020-02-13 Telefonaktiebolaget Lm Ericsson (Publ) Inter-system handover from single/dual connectivity systems to dual connectivity systems

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
ERICSSON: "Support for inter-system MR DC HO (37.340)", 3GPP DRAFT; R2-1817748 - SUPPORT FOR INTER-SYSTEM MR DC HO (37.340), 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG2, no. Spokane, Washington, USA; 20181112 - 20181116, 12 November 2018 (2018-11-12), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP051557268 *
NOKIA, NOKIA SHANGHAI BELL: "(TP for data forwarding BL CR for TS 38.413) Inter-system direct forwarding with shared SgNB/gNB", 3GPP DRAFT; R3-195354_DIRECTINTWG413, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG3, no. Chongqing, China; 20191014 - 20191018, 4 October 2019 (2019-10-04), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP051792391 *
See also references of EP4099796A4

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US20220386186A1 (en) 2022-12-01
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EP4099796A4 (en) 2023-07-26
JP2023513809A (ja) 2023-04-03
KR20220137711A (ko) 2022-10-12

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