WO2018202187A1 - 一种切换的方法、终端设备及网络设备 - Google Patents

一种切换的方法、终端设备及网络设备 Download PDF

Info

Publication number
WO2018202187A1
WO2018202187A1 PCT/CN2018/085743 CN2018085743W WO2018202187A1 WO 2018202187 A1 WO2018202187 A1 WO 2018202187A1 CN 2018085743 W CN2018085743 W CN 2018085743W WO 2018202187 A1 WO2018202187 A1 WO 2018202187A1
Authority
WO
WIPO (PCT)
Prior art keywords
network node
terminal device
data
handover
network
Prior art date
Application number
PCT/CN2018/085743
Other languages
English (en)
French (fr)
Inventor
王曼
戴明增
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to BR112019023221-4A priority Critical patent/BR112019023221A2/pt
Priority to JP2019560759A priority patent/JP6920468B2/ja
Priority to CA3062360A priority patent/CA3062360C/en
Priority to EP18794486.3A priority patent/EP3621350B1/en
Priority to RU2019139385A priority patent/RU2763519C2/ru
Priority to KR1020197035995A priority patent/KR102276720B1/ko
Publication of WO2018202187A1 publication Critical patent/WO2018202187A1/zh
Priority to US16/673,497 priority patent/US11265769B2/en

Links

Images

Classifications

    • 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
    • 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
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • 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
    • H04W36/0064—Transmission or use of information for re-establishing the radio link of control information between different access points
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H04W36/087—Reselecting an access point between radio units of access points
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/02—Data link layer protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/08—Upper layer protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H04W88/085—Access point devices with remote components
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
    • H04W36/023—Buffering or recovering information during reselection
    • H04W36/0235—Buffering or recovering information during reselection by transmitting sequence numbers, e.g. SN status transfer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/36—Reselection control by user or terminal equipment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal

Definitions

  • the present application relates to the field of field communication, and more particularly, to a handover method, a terminal device, and a network device.
  • the CRAN control node Central Unit or Control Unit (CU) and the data unit (Date Unit or Distributed Unit, DU) are introduced, that is, the original The overall deployed Base Band Unit (BBU) is divided into two parts.
  • BBU Base Band Unit
  • the interface between the CU-DUs is introduced due to the division between the CU-DUs.
  • the information originally interacted inside the base station needs to be transmitted through the interface between the CU-DUs.
  • HO handover
  • intra-CU Intra-CU
  • intra-DU Intra-DU
  • Inter-CU inter-CU
  • the HO process involves the handover process in the CU, the handover process in the DU, and the handover process between the CUs, and how each process is implemented, which involves the redesign of the HO solution and the optimization of the design solution.
  • the present application provides a handover method, a terminal device, and a network device, which can ensure that the terminal device performs normal handover when the network device part function is separated into different network nodes.
  • a handover method including: the first network node learns that the terminal device needs to perform handover, and the handover is a handover from the second network node to the third network node, or the handover is from the a handover of a first cell of the second network node to a second cell of the second network node, the first network node comprising at least one of a packet data convergence protocol layer, a service data adaptation layer, and a radio resource control function,
  • the second network node and the third network node include at least one of a radio link layer control protocol layer, a media intervention control layer, and a physical layer function; when the handover is from the second network node to the third network node
  • the first network node sends the radio link setup indication information to the third network node, where the radio link setup indication information is used to indicate that the third network node establishes a radio link for the terminal device;
  • the first cell of the second network node switches to the second cell of the second network node,
  • the second network node and the third network node are managed by the first network node.
  • the method when the switching is a handover from the second network node to the third network node, the method further The first network node receives a data transmission status sent by the second network node, where the data transmission status is used to indicate that the data sequence number is not successfully sent to the terminal device; and the first network node sends a status according to the data transmission status to the first network node.
  • the third network node sends the unsuccessfully transmitted data.
  • the first network node determines, according to data sent by the second network node, a data sending status of the terminal device, where the data sending status is used to indicate that the data sequence number is not successfully sent; The network node sends the unsuccessfully transmitted data sequence number to the terminal device, so that the terminal device continues to send the unsuccessfully transmitted data to the first network node after switching to the third network node.
  • the method before the first network node sends the handover command to the terminal device, the method further includes: the first The network node sends a first handover request message to the third network node; the first network node receives a first handover request acknowledgement message sent by the third network node.
  • the method further includes The first network node receives the random access request sent by the terminal device; the first network node sends a random access response to the terminal device; the first network node receives the radio resource control setup complete message sent by the terminal device; The first network node sends the indication information to the second network node, where the indication information is used to indicate that the second network node releases the context information of the terminal device.
  • the second network node is managed by the first network node, where the third network node is managed by a fourth network node, where the fourth network node includes Packet data aggregation protocol layer and radio resource control functions.
  • the method when the switching is to switch from the second network node to the third network node, the method further The method includes: receiving, by the first network node, a data sending status sent by the second network node, where the data sending status is used to indicate that the terminal device does not send successful data; and the first network node sends the data to the fourth network node. Sending a status, so that the fourth network node sends the unsuccessfully sent data to the third network node, where the data sending status is used to indicate that the data sequence number is not successfully sent to the terminal device.
  • the method before the first network node sends the handover command to the terminal device, the method further includes The first network node sends a second handover request message to the fourth network node; the first network node receives a second handover request acknowledgement message sent by the fourth network node.
  • the method further includes The first network node sends the indication information to the second network node, where the indication information is used to indicate that the second network node releases the context information of the terminal device.
  • the handover method of the embodiment of the present application can ensure that the terminal device performs normal handover when the network device part function is separated into different network nodes.
  • a network device comprising a memory and a processor for storing instructions for invoking instructions in the memory to perform the first aspect or the first aspect An operation in a method in a possible implementation.
  • a handover method includes: the terminal device sends a first message to the first network node, where the first message is used to request the first network node to perform handover on the terminal device, where the handover is a handover of the second network node to the third network node, or the handover is a handover from a first cell of the second network node to a second cell of the second network node, the first network node comprising a packet data convergence protocol layer At least one of a service data adaptation layer and a radio resource control function, the second network node and the third network node including at least one of a radio link layer control protocol layer, a media intervention control layer, and a physical layer function
  • the terminal device receives a handover command sent by the first network node, and the handover command is used to indicate the handover.
  • the second network node and the third network node are managed by the first network node.
  • the terminal device when the handover is a handover from the second network node to the third network node, the terminal device receives the unsuccessfully transmitted data sequence number sent by the first network node, so as to facilitate the After the terminal device switches to the third network node, the unsuccessfully transmitted data is continuously sent to the first network node.
  • the terminal device when the switching is a handover from the second network node to the third network node, the terminal device Before receiving the handover command sent by the first network node, the method further includes: the terminal device establishing a first link and a second link, where the first link is a chain from the first network node to the second network node The second link is a link from the first network node to the third network node; the first link fails to generate a radio link, and the terminal device determines to switch from the first link to the second link a link; the terminal device transmits data on the second link.
  • the method before the terminal device is switched from the first link to the second link, the method further includes The terminal device measures and/or listens to the second link according to the first period.
  • the terminal device when the switching is a handover from the second network node to the third network node, the terminal device Before receiving the handover command sent by the first network node, the method further includes: the terminal device establishing a first link, where the first link is a link from the first network node to the second network node; The radio link fails on the link, the terminal device continues to measure and/or listen to the first link; when the first link returns to normal, the terminal device transmits data on the first link.
  • the terminal device receives the first network node to send After the switching command, the method further includes: the terminal device sending a random access request to the first network node and the third network node; the terminal device receiving the random connection sent by the first network node and the third network node In response, the terminal device sends a radio resource control setup complete message to the first network node and the third network node.
  • the second network node is managed by the first network node, where the third network node is managed by a fourth network node, where the fourth network node includes At least one of a packet data convergence protocol layer, a service data adaptation layer, and a radio resource control function.
  • the method when the switching is a handover from the second network node to the third network node, the method further The method includes: the terminal device sends a random access request to the third network node and the fourth network node; the terminal device receives a random access response sent by the third network node and the fourth network node; The third network node and the fourth network node send a radio resource control setup complete message.
  • the handover method of the embodiment of the present application can ensure that the terminal device performs normal handover when the network device part function is separated into different network nodes.
  • a terminal device comprising a memory and a processor, the memory is configured to store an instruction, and the processor is configured to invoke an instruction in the memory to perform the third aspect or the third aspect An operation in a method in a possible implementation.
  • a fifth aspect provides a handover method, where the method includes: receiving, by a second network node, a handover command sent by a first network node, where the handover command is used to instruct a terminal device to perform handover, where the handover is from a second network node to a Switching of the three network nodes, or the handover is a handover from a first cell of the second network node to a second cell of the second network node, the first network node comprising a packet data convergence protocol layer and a service data adaptation layer And at least one of the radio resource control function, the second network node and the third network node comprise at least one of a radio link layer control protocol layer, a media intervention control layer, and a physical layer function; when the switch is from When the first cell of the second network node switches to the second cell of the second network node, the second network node receives the first network node to send radio link change indication information, where the radio link change indication information is used by The serving cell indicating the terminal device is handed over from the
  • the second network node and the third network node are managed by the first network node.
  • the second network node is managed by the first network node, where the third network node is managed by a fourth network node, where the fourth network node includes Packet data aggregation protocol layer and radio resource control functions.
  • the method when the switching is to switch from the second network node to the third network node, the method is The method further includes: sending, by the second network node, a data sending status to the first network node, where the data sending status is used to indicate that the data sequence number is not successfully sent to the terminal device.
  • the handover method of the embodiment of the present application can ensure that the terminal device performs normal handover when the network device part function is separated into different network nodes.
  • a network device comprising a memory and a processor, the memory is configured to store an instruction, and the processor is configured to invoke an instruction in the memory to perform the fifth aspect or the fifth aspect An operation in a method in a possible implementation.
  • a handover method includes: receiving, by a third network node, a first handover request message sent by the first network node, where the first handover request message is used to indicate that the terminal device performs handover, and the handover is a handover of the second network node to the third network node, or the handover is a handover from a first cell of the second network node to a second cell of the second network node, the first network node comprising a packet data convergence protocol layer At least one of a service data adaptation layer and a radio resource control function, the second network node and the third network node including at least one of a radio link layer control protocol layer, a media intervention control layer, and a physical layer function
  • the third network node receives radio link establishment indication information sent by the first network node, where the radio link setup indication information is used for Instructing the third network node to establish a wireless link for the
  • the second network node and the third network node are managed by the first network node.
  • the second network node is managed by the first network node, and the third network node is managed by a fourth network node, where the fourth network node includes Packet data aggregation protocol layer and radio resource control functions.
  • the method further includes: the third network node node receiving the data segmentation information sent by the second network device, the data segmentation information being used to indicate that the data segment is not successfully sent to the terminal device.
  • the handover method of the embodiment of the present application can ensure that the terminal device performs normal handover when the network device part function is separated into different network nodes.
  • a network device comprising a memory and a processor, the memory is configured to store an instruction, and the processor is configured to invoke an instruction in the memory to perform the seventh aspect or the seventh aspect An operation in a method in a possible implementation.
  • a handover method includes: receiving, by a fourth network node, a second handover request message sent by the first network node, where the second handover request message is used to indicate that the terminal device performs handover, and the handover is Switching of a second network node to a third network node, the second network node being managed by the first network node, the third network node being managed by a fourth network node, the first network node and the fourth network node comprising a packet At least one of a data convergence protocol layer, a service data adaptation layer, and a radio resource control function, where the second network node and the third network node comprise a radio link layer control protocol layer, a media intervention control layer, and a physical layer function At least one of the following: when the switching is a handover from the second network node to the third network node, the fourth network node receives a data transmission status sent by the first network node, where the data transmission status is used to indicate a direction
  • the terminal device includes: receiving, by a fourth network
  • the method further includes: sending, by the fourth network node, the unsuccessfully transmitted data to the third network node according to the data sending state.
  • the method further includes: the fourth network node receiving the random access sent by the terminal device The fourth network node sends a random access response to the terminal device; the fourth network node receives the radio resource control setup complete message sent by the terminal device; the fourth network node sends the indication information to the first network node, The indication information is used to indicate that the second network node releases the context information of the terminal device.
  • the method further includes: The fourth network node sends a third handover request message to the core network; the fourth network node receives the third handover request acknowledgement message sent by the core network.
  • the handover method of the embodiment of the present application can ensure that the terminal device performs normal handover when the network device part function is separated into different network nodes.
  • a network device comprising a memory and a processor, the memory is configured to store an instruction, and the processor is configured to invoke an instruction in the memory to perform the ninth aspect or the ninth aspect An operation in a method in a possible implementation.
  • a network device configured to: a processing module, configured to learn that a terminal device needs to perform handover, the handover is a handover from a second network node to a third network node, or the handover is a slave Switching of the first cell of the second network node to the second cell of the second network node, the first network node comprising at least one of a packet data convergence protocol layer, a service data adaptation layer, and a radio resource control function,
  • the second network node and the third network node include at least one of a radio link layer control protocol layer, a media intervention control layer, and a physical layer function; and a transceiver module configured to: when the handover is from the second network node to And transmitting, by the third network node, radio link establishment indication information, where the radio link establishment indication information is used to instruct the third network node to establish a radio link for the terminal device; the transceiver module further For transmitting to the second network node when the handover is a
  • the second network node and the third network node are managed by the first network node.
  • the transceiver module when the switching is the switching from the second network node to the third network node, The transceiver module is further configured to receive a data sending status sent by the second network node, where the data sending status is used to indicate that the data sequence number is not successfully sent to the terminal device; the processing module is further configured to send the status according to the data The third network node sends the unsuccessfully transmitted data.
  • the transceiver module is further configured to send a first handover request message to the third network node;
  • the module is further configured to receive a first handover request acknowledgement message sent by the third network node.
  • the transceiver module is further configured to receive a random access request sent by the terminal device; The transceiver module is further configured to send a random access response to the terminal device; the transceiver module is further configured to receive a radio resource control setup complete message sent by the terminal device; the transceiver module is further configured to send the indication information to the second network node The indication information is used to indicate that the second network node releases the context information of the terminal device.
  • the second network node is managed by the first network node
  • the third network node is managed by the fourth network node
  • the fourth network The nodes include a packet data convergence protocol layer and radio resource control functions.
  • the transceiver module is further configured to receive a data sending status sent by the second network node, where the data is sent The status is used to indicate that the data is not successfully sent to the terminal device; the transceiver module is further configured to send the data sending status to the fourth network node, so that the fourth network node sends the unsuccessful transmission to the third network node. The data.
  • the transceiver module is further configured to send a second handover request to the fourth network node.
  • the transceiver module is further configured to receive a second handover request acknowledgement message sent by the fourth network node.
  • the transceiver module is further configured to send the indication information to the second network node, where The indication information is used to indicate that the second network node releases the context information of the terminal device.
  • the network device in the embodiment of the present application can ensure that the terminal device performs normal handover when the network device part function is separated into different network nodes.
  • a terminal device includes: a transceiver module, configured to send a first message to the first network node, where the first message is used to request the first network node to switch the terminal device And switching to a handover from the second network node to the third network node, or the handover is a handover from a first cell of the second network node to a second cell of the second network node, the first network node comprising At least one of a packet data convergence protocol layer, a service data adaptation layer, and a radio resource control function, the second network node and the third network node including a radio link layer control protocol layer, a media intervention control layer, and a physical layer function At least one of the transceiver modules is further configured to receive a handover command sent by the first network node, where the handover command is used to indicate the handover.
  • the second network node and the third network node are managed by the first network node.
  • the transceiver module when the handover is a handover from the second network node to the third network node, is further configured to receive a data sequence number that is sent by the first network node and is not successfully sent. So that the terminal device continues to send unsuccessfully transmitted data to the first network node after switching to the third network node.
  • the terminal device when the switching is a handover from the second network node to the third network node, The terminal device further includes: a processing module, configured to establish a first link and a second link, where the first link is a link from the first network node to the second network node, and the second link is from the a link from the first network node to the third network node; the first link has a radio link failure, the processing module is further configured to determine to switch from the first link to the second link; the transceiver module further Used to transmit data on the second link.
  • a processing module configured to establish a first link and a second link, where the first link is a link from the first network node to the second network node, and the second link is from the a link from the first network node to the third network node; the first link has a radio link failure, the processing module is further configured to determine to switch from the first link to the second link; the transceiver module further Used to transmit data on the second link.
  • the processing module is further configured to measure and/or listen to the second link according to the first period.
  • the processing module when the switching is to switch from the second network node to the third network node, The processing module is further configured to establish a first link, where the first link is a link from the first network node to the second network node; the first link fails to generate a radio link, and the processing module is further configured to continue Measuring and/or listening to the first link; the transceiver module is further configured to transmit data on the first link when the first link returns to normal.
  • the transceiver module is further configured to The first network node and the third network node send a random access request; the transceiver module is further configured to receive a random access response sent by the first network node and the third network node; the transceiver module is further configured to A network node and the third network node send a radio resource control setup complete message.
  • the second network node is managed by the first network node, and the third network node is managed by a fourth network node, the fourth network The node includes at least one of a packet data convergence protocol layer, a service data adaptation layer, and a radio resource control function.
  • the transceiver module when the switching is to switch from the second network node to the third network node, The transceiver module is further configured to send a random access request to the third network node and the fourth network node; the transceiver module is further configured to receive a random access response sent by the third network node and the fourth network node; The module is further configured to send a radio resource control setup complete message to the third network node and the fourth network node.
  • the network device in the embodiment of the present application can ensure that the terminal device performs normal handover when the network device part function is separated into different network nodes.
  • a network device includes: a transceiver module, configured to receive a handover command sent by a first network node, where the handover command is used to indicate that the terminal device performs handover, and the handover is from the second network.
  • the transceiver module is further configured to receive the wireless network change indication information, the wireless link, when the handover is performed from the first cell of the second network node to the second cell of the second network node.
  • the change indication information is used to indicate that the serving cell of the terminal device is switched from the first cell to the second cell; and the processing module is configured to use, according to the handover command, Put the context information of the second network node.
  • the second network node and the third network node are managed by the first network node.
  • the second network node is managed by the first network node, and the third network node is managed by a fourth network node, the fourth network
  • the nodes include a packet data convergence protocol layer and radio resource control functions.
  • the transceiver module when the switching is a handover from the second network node to the third network node, is further configured to send a data transmission status to the first network node, where the data transmission status is used to indicate that a successful data sequence number is not sent to the terminal device.
  • the network device in the embodiment of the present application can ensure that the terminal device performs normal handover when the network device part function is separated into different network nodes.
  • a network device includes: a transceiver module, configured to receive a first handover request message sent by a first network node, where the first handover request message is used to indicate that the terminal device performs handover, where Switching to a handover from a second network node to a third network node, or switching to a handover from a first cell of the second network node to a second cell of the second network node, the first network node comprising packet data At least one of a convergence protocol layer, a service data adaptation layer, and a radio resource control function, where the second network node and the third network node comprise a radio link layer control protocol layer, a media intervention control layer, and a physical layer function.
  • the transceiver module is further configured to receive radio link establishment indication information sent by the first network node, where the radio link is established
  • the indication information is used to indicate that the third network node establishes a wireless link for the terminal device
  • the processing module is configured to control the transceiver module to the first network node. Sending a first handover request acknowledgment message, the first handover request acknowledgment message for acknowledging the handover for the terminal device.
  • the second network node and the third network node are managed by the first network node.
  • the second network node is managed by the first network node, and the third network node is managed by a fourth network node, the fourth network
  • the nodes include a packet data convergence protocol layer and radio resource control functions.
  • the transceiver module when the switching is to switch from the second network node to the third network node
  • the transceiver module is further configured to receive data segmentation information sent by the second network device, where the data segmentation information is used to indicate that the data segment is not successfully sent to the terminal device.
  • the network device in the embodiment of the present application can ensure that the terminal device performs normal handover when the network device part function is separated into different network nodes.
  • a network device configured to receive a second handover request message sent by a first network node, where the second handover request message is used to indicate that the terminal device performs handover, and the handover
  • the second network node is managed by the first network node
  • the third network node is managed by the fourth network node
  • the first network node and the fourth network node At least one of a packet data convergence protocol layer, a service data adaptation layer, and a radio resource control function, where the second network node and the third network node comprise a radio link layer control protocol layer, a media intervention control layer, and a physical layer At least one of the functions;
  • the transceiver module is further configured to receive a data transmission status sent by the first network node, where the data transmission status is used And indicating that the data sequence number
  • the transceiver module is further configured to send, according to the data sending status, the unsent to the third network node, under the control of the processing module Successful data.
  • the transceiver module is further configured to receive a random access request sent by the terminal device; The transceiver module is further configured to send a random access response to the terminal device; the transceiver module is further configured to receive a radio resource control setup complete message sent by the terminal device; the transceiver module is further configured to send the indication information to the first network node The indication information is used to indicate that the second network node releases the context information of the terminal device.
  • the transceiver module The method is further configured to send a third handover request message to the core network; the transceiver module is further configured to receive a third handover request acknowledgement message sent by the core network.
  • the network device in the embodiment of the present application can ensure that the terminal device performs normal handover when the network device part function is separated into different network nodes.
  • a computer readable storage medium is provided, the instructions being stored in the computer readable storage medium, when executed on a computer, causing the computer to perform the method of the various aspects described above.
  • a system chip includes an input/output interface, at least one processor, at least one memory, and a bus, the at least one memory is configured to store an instruction, and the at least one processor is configured to invoke the at least one The instructions of the memory perform the operations of the methods of the various aspects described above.
  • FIG. 1 is a schematic diagram of an application scenario according to a technical solution of an embodiment of the present application.
  • FIG. 2 is a schematic diagram of another application scenario of a technical solution according to an embodiment of the present application.
  • FIG. 3 is a schematic diagram of still another application scenario according to the technical solution of the embodiment of the present application.
  • FIG. 4 is a schematic diagram of still another application scenario according to the technical solution of the embodiment of the present application.
  • FIG. 5 is a schematic diagram of still another application scenario according to the technical solution of the embodiment of the present application.
  • FIG. 6 shows a schematic flow chart of a handover method according to an embodiment of the present application.
  • FIG. 7 shows still another schematic flowchart of a handover method according to an embodiment of the present application.
  • FIG. 8 shows a schematic diagram of data state forwarding in accordance with an embodiment of the present application.
  • FIG. 9 shows still another schematic flowchart of a handover method according to an embodiment of the present application.
  • FIG. 10 shows still another schematic flowchart of a handover method according to an embodiment of the present application.
  • FIG. 11 shows another schematic diagram of data state forwarding in accordance with an embodiment of the present application.
  • FIG. 12 is a schematic block diagram of a network device according to an embodiment of the present application.
  • FIG. 13 is a schematic block diagram of a terminal device according to an embodiment of the present application.
  • FIG. 14 is another schematic block diagram of a network device according to an embodiment of the present application.
  • FIG. 15 is still another schematic block diagram of a network device according to an embodiment of the present application.
  • FIG. 16 is still another schematic block diagram of a network device according to an embodiment of the present application.
  • FIG. 17 is a schematic block diagram of a network device according to an embodiment of the present application.
  • FIG. 18 is a schematic block diagram of a terminal device according to an embodiment of the present application.
  • FIG. 19 is another schematic block diagram of a network device according to an embodiment of the present application.
  • FIG. 20 is still another schematic block diagram of a network device according to an embodiment of the present application.
  • FIG. 21 is still another schematic block diagram of a network device according to an embodiment of the present application.
  • FIG. 1 is a schematic diagram of an application scenario of the technical solution of the embodiment of the present application. As shown in FIG. Part of the function is separated into a first network node and a second network node.
  • FIG. 2 is a schematic diagram of another application scenario of the technical solution of the embodiment of the present application.
  • a CU-DU segmentation is introduced, and the DU may correspond to FIG.
  • the first network node in the CU corresponds to the second network node in FIG.
  • first network node and the second network node may be two physical or logical separation modules in an overall network architecture, or may be two logical network elements that are completely independent.
  • embodiments of the present application are applicable to various handover procedures in the CU-DU architecture, including but not limited to intra-CU (Intra-CU) handover, intra-DU (Intra-DU) handover, and inter-CU (Inter- CU) switching.
  • intra-CU Intra-CU
  • Intra-DU Intra-DU
  • Inter- CU Inter-CU
  • FIG. 3 is a schematic diagram of still another application scenario of the technical solution of the embodiment of the present application, where the application scenario mainly relates to handover within the CU.
  • FIG. 4 is a schematic diagram of still another application scenario of the technical solution of the embodiment of the present application, where the application scenario mainly relates to switching within the DU.
  • FIG. 5 is a schematic diagram of still another application scenario of the technical solution of the embodiment of the present application, where the application scenario mainly relates to switching between CUs.
  • the CU has a Radio Resource Control (RRC) or a partial RRC control function, and includes all protocol layer functions or partial protocol layer functions of the existing base station; for example, only the RRC function or part of the RRC function, or the RRC function or service is included.
  • RRC Radio Resource Control
  • SDAP Service Data Adaptation Protocol
  • PDCP Packet Data Convergence Protocol
  • RLC Radio Link layer control protocols
  • MAC Media Access Control
  • the DU has all or part of the protocol layer functions of the existing base station, that is, part of the protocol layer functional units of the RRC/SDAP/PDCP/RLC/MAC/PHY, for example, including protocol layer functions such as PDCP/RLC/MAC/PHY, or includes RLC/ Protocol layer functions such as MAC/PHY may include partial RLC/MAC/PHY functions, or only all or part of PHY functions; it should be noted that the functions of the various protocol layers mentioned herein may change, and are within the scope of this application. Inside.
  • GSM Global System of Mobile Communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • LTE Long Term Evolution
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • UMTS Universal Mobile Telecommunication System
  • 5G fifth-generation
  • the network device in the embodiment of the present application may be a device for communicating with the terminal device, for example, may be a base station (Base Transceiver Station, BTS) and a base station controller (Base Station Controller) in the GSM system or CDMA.
  • BTS Base Transceiver Station
  • Base Station Controller Base Station Controller
  • the combination of the BSC may also be a base station (NodeB, NB) and a radio network controller (RNC) in the WCDMA system, or may be an evolved base station (Evolutional Node B, eNB or eNodeB) in the LTE system.
  • BTS Base Transceiver Station
  • Base Station Controller Base Station Controller
  • the combination of the BSC may also be a base station (NodeB, NB) and a radio network controller (RNC) in the WCDMA system, or may be an evolved base station (Evolutional Node B, eNB or eNodeB) in the LTE system.
  • NodeB NodeB
  • RNC
  • the network device may be a relay station, an access point, an in-vehicle device, a wearable device, and an access network device in a future 5G network, such as a next-generation base station, or a future evolved public land mobile network (PLMN). ) Access network equipment in the network, etc.
  • a future 5G network such as a next-generation base station, or a future evolved public land mobile network (PLMN).
  • PLMN public land mobile network
  • the wireless network control node and the base station are separated.
  • the baseband module and the radio frequency module are separated, that is, the radio frequency.
  • the remote data center (Data Center, DC) scenario requires two different networks to interconnect; the large and small station scenarios, the large and small stations are connected to each other; the LTE and Wifi aggregation (LTE-Wifi aggregation, LWA) scenarios;
  • LTE-Wifi aggregation LTE-Wifi aggregation, LWA
  • There are various non-cell scenarios in the 5G system terminal can freely switch between cells, there is no clear boundary between cells), there is a control node and all cells are connected, or under the cell Connected to each transport node; in the CRAN scenario, there is a scenario where the BBU is split; in the CRAN virtualization scenario, a part of the BBU is deployed in a centralized manner, virtualized, and another part of the functions are deployed separately, and there is a possibility of physical separation between the two parts; It is understood that different system/system coexistence scenarios are within the scope of this application.
  • the present application describes various embodiments in connection with a terminal device.
  • the terminal device may also refer to a user equipment (User Equipment, UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, and a user agent.
  • the access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), with wireless communication.
  • FIG. 6 shows a schematic flowchart of a handover method 100 according to an embodiment of the present application.
  • the first network node may correspond to the CU in FIG. 3, and the second network node may correspond to DU1 in FIG.
  • the third network node may correspond to the DU2 in FIG. 3; or the first network node may correspond to the CU in FIG. 4, the second network node may correspond to the DU in FIG. 4; or the first network node may Corresponding to the source control node (S-CU) in FIG. 5, the second network node may correspond to the source data unit (S-DU) in FIG. 5, and the third network node may correspond to the target data in FIG. Unit (T-DU), as shown in Figure 6, the method 100 includes:
  • the first network node determines that the terminal device needs to perform handover, where the handover is a handover from the second network node to the third network node, or the handover is from the first cell of the second network node to the second network node.
  • the first network node includes at least one of a packet data convergence protocol layer, a service data adaptation layer, and a radio resource control function
  • the second network node and the third network node include a radio link layer At least one of a control protocol layer, a media intervention control layer, and a physical layer function;
  • the first network node sends radio link establishment indication information to the third network node, where the radio link setup indication information is used. Instructing the third network node to establish a wireless link for the terminal device;
  • the first network node sends wireless link change indication information to the second network node, where the wireless The link change indication information is used to indicate that the serving cell of the terminal device is handed over from the first cell to the second cell;
  • the first network node sends a handover command to the terminal device, where the handover command is used to instruct the terminal device to perform the handover.
  • the first network node includes at least one of a packet data convergence protocol layer, a service data adaptation layer, and a radio resource control function, where the second network node and the third network node comprise a radio link layer control protocol. At least one of a layer, a media intervention control layer, and a physical layer function, after the first network node determines that the terminal device needs to perform handover, the first network node sends a handover command to the terminal device, where the handover command is used to indicate The terminal device switches from the second network node to the third network node, or from the first cell of the second network node to the second cell of the second network node.
  • the CU has the PDCP RRC function
  • the DU1 and the DU2 have the RLC/MAC/PHY function
  • the DU1 and the DU2 are managed by the CU.
  • the CU has a PDCP RRC function, and the DU has an RLC/MAC/PHY function.
  • the CU After the CU receives the first message of the terminal device, it determines that the terminal device needs to switch from the first cell under the control of the DU. To the second cell under the control of the DU.
  • the S-CU and the T-CU have the PDCP RRC function
  • the S-DU and the T-DU have the RLC/MAC/PHY function
  • the S-DU is managed by the S-CU
  • the T-DU is managed by the T.
  • - CU management after the CU receives the first message of the terminal device, it is determined that the terminal device needs to be switched from the S-DU under the control of the S-CU to the T-DU under the control of the T-DU.
  • the switching method of the embodiment of the present application can ensure that the terminal device performs fast switching when the functions of the network device are separated into different network nodes.
  • FIG. 7 shows a schematic flowchart of a handover method 200 according to an embodiment of the present application.
  • the first network node may correspond to the CU in FIG. 3, and the second network node may correspond to DU1 in FIG.
  • the three network nodes may correspond to DU2 in FIG. 3.
  • the method 200 includes:
  • the first network node determines that the terminal device needs to perform handover, where the handover is a handover from the second network node to the third network node, where the first network node includes a packet data convergence protocol layer, a service data adaptation layer, and radio resource control.
  • the second network node and the third network node comprise at least one of a radio link layer control protocol layer, a media intervention control layer, and a physical layer function.
  • the first network node may have a packet data convergence protocol layer, a service data adaptation layer, and a radio resource control function
  • the second network node and the third network node may respectively have a radio link layer control protocol layer and media intervention. Control layer and physical layer functions.
  • the method 200 further includes:
  • the terminal device sends a first message to the first network node, where the first message is used to request the first network node to switch the terminal device.
  • the first message may be a measurement report, or may be load information or interference information, and the application is not limited thereto.
  • the first network node determines, according to the first message, that the terminal device needs to perform handover from the second network node to the third network node, where the first network node includes a packet.
  • the second network node and the third network node are managed by the first network node.
  • DU1 and DU2 are managed by the CU. After receiving the first message of the terminal device, the CU determines that the terminal device needs to be switched from the DU1 under the CU control to the DU2 under the CU control, where the CU has the PDCP RRC. Function, DU1 and DU2 have RLC/MAC/PHY functions.
  • the first network node sends radio link establishment indication information to the third network node, where the radio link setup indication information is used. Instructing the third network node to establish a wireless link for the terminal device.
  • the radio link setup indication information is used to indicate that the third network node establishes a radio link for the terminal device, where the radio link is a link from the first network node to the third network node.
  • the first network node when the first network node determines that the terminal device needs to be handed over from the second network node to the third network node, the first network node sends wireless link establishment indication information to the third network node, where The wireless link setup indication information is used to instruct the third network node to establish a wireless link for the terminal device, so that the first network node and/or the terminal device transmits data on the new wireless link.
  • the radio link indication message may be a terminal device context setup request message
  • the first network node sends a context setup request message of the terminal device to the third network node.
  • the third network node establishes a radio link for the terminal device according to the context setup request message of the terminal device.
  • the context setup request of the terminal device includes bearer information, cell information, and the like to be established for the terminal device.
  • the third network node receives the context setup request message of the terminal device, completing the context establishment of the terminal device, such as the establishment of the bearer, means that the wireless link is successfully established.
  • the method 200 further includes:
  • the first network node when the handover is a handover from the second network node to the third network node, the first network node receives a data transmission state sent by the second network node, where the data transmission state is used to indicate to the terminal device. A successful data sequence number was not sent.
  • the first network node determines that the terminal device switches from the second network node to the third network node
  • data forwarding for example, transmission of downlink data from the first link (the first network node -
  • the second network node-terminal device switches to the second link (the first network node - the third network node - the terminal device)
  • data loss may occur, and the first network node is required to perform the lost data.
  • the second network node Retransmitting, in particular, the second network node sends a data transmission status to the first network node, where the data transmission status is used to indicate that the data sequence number is not successfully sent to the terminal device, and the first network node is based on the data
  • the sending status continues to send the unsuccessfully transmitted data to the terminal device to the third network node.
  • the first network node receives the data sent by the second network node, and determines the uplink data transmission status according to the data sent by the second network node.
  • the unsuccessfully transmitted data is also the entire data, and may be part or a segment of the entire data. If the unsent data is also the entire data, the terminal device first sends the data to the second network node.
  • the first data status report the second network node may translate the first data status report into a data transmission status, and notify the first network device of the data transmission status.
  • the second network node translates the latest data status report into a data transmission status, and notifies the first data transmission status to the first Network node.
  • RLF Radio Link Failure
  • the first network node may identify the data transmission status, determine a data sequence number that is successfully sent, and send the unsuccessfully sent data to the third network node, and the third network node may not send the data successfully.
  • the data is sent to the terminal device.
  • the second network node is in addition to transmitting a data transmission status to the first network node, due to segmentation of data at the second network node or the third
  • the second network node further sends the data segmentation information to the third network node, and after receiving the segmentation information, the third network node may send the first network node unsuccessfully sent.
  • the data is segmented, and the data segment that has not been successfully transmitted is sent to the terminal device.
  • the first network node determines, according to the uplink data sent by the second network node, the uplink data transmission status of the terminal device, determines the sequence number of the successfully transmitted data, and sends the data sequence number that is not successfully sent. Giving the terminal device, so that the terminal device continues to send unsuccessfully transmitted data to the first network node after switching to the third network node.
  • FIG. 8 is a schematic diagram of data forwarding in a CU-DU architecture.
  • Lost Radio Link Layer Control Protocol Data Units (Lost RLC PDUs) have two forms, one is a Lost RLC PDU, and the other is a Is the Lost RLC PDU segmentation (data segment).
  • the UE For the Lost RLC PDU, the UE sends the original RLC status report (RLC status report) to the RLC entity (DU1) of the first link (CU-DU1-UE), and the RLC entity of the first link translates to the PDCP status. Report, telling the PDCP entity (CU).
  • the RLC entity of the first link translates the latest RLC status report into a PDCP status report, telling the PDCP entity.
  • the RLC entity only needs to inform the PDCP entity of the last data sequence number (SN number) of consecutive RLC PDUs received, or the SN number of the first RLC PDU that is lost, or the RLC PDU that is lost in consecutive RLC PDUs.
  • the RLC entity of the first link needs to send the data segmentation information to the RLC entity (DU2) of the second link in addition to the PDCP status report to the PDCP entity, and the DU2 receives the data segment.
  • the retransmitted data sent by the PDCP entity may be segmented, and the unsent data segment is sent to the terminal device.
  • the first network node sends a handover command to the terminal device, where the handover command is used to instruct the terminal device to perform the handover.
  • the method 200 further includes:
  • the terminal device establishes a first link and a second link, where the first link is a link from the first network node to a second network node, and the second link is from the first network node to The link of the third network node.
  • the first link and the second link comprise a radio resource control configuration, where the radio resource control configuration comprises at least one of a radio link layer control protocol layer, a media intervention control layer, and a physical layer.
  • the UE may establish two sets of protocol stacks before receiving the handover command, one set of activation (which may be the first link) and another set of deactivation (which may be the second chain) Path), when the UE needs to switch from the active link to the deactivated link, it quickly switches to the deactivated link. All configurations of the link to be activated at this time, including the RLC/MAC/PHY, have been configured at the beginning. When it is necessary to switch to the deactivated link, the deactivated link needs to be activated first, and the UE activates the link. A measurement is made to confirm that the deactivation link is feasible, and then the user plane data is directly transmitted.
  • the terminal device may measure and/or monitor the second link according to a certain period to ensure that the second link is quickly available.
  • the UE may determine the deactivated link according to the measurement result. Directly available, then directly transfer user plane data.
  • the terminal device may measure and/or monitor the second link according to a certain period.
  • the terminal device may set a timer Timer1, and the deactivation chain is always used before the timer expires.
  • the path is measured and/or monitored.
  • the measurement and/or monitoring period can be adjusted to set a longer measurement and/or listening period than the current measurement period.
  • the terminal device in S221 may also establish a link, such as the foregoing first link, where the first link is a link from the first network node to the second network node, and the first link is wireless.
  • the link fails and the terminal device continues to measure and/or listen to the first link.
  • the UE saves all configurations, including the configuration of RLC/MAC/PHY, and the UE is always on this link. In the measurement or monitoring state. User plane data can be transmitted on this link immediately after the radio link recovery of the UE and DU1.
  • the terminal device sets a Timer2, and when the Timer2 does not time out, the configuration is retained and the measurement or listening state is maintained; when the Timer2 times out, the period of measurement or monitoring is extended. It saves resources and keeps the terminal device in the listening state for fast switching.
  • the method before the sending, by the first network node, the handover command to the terminal device, the method further includes:
  • the first network node sends a first handover request message to the third network node.
  • the first network node receives a first handover request acknowledgement message sent by the third network node.
  • the first handover request message when the first network node determines that the terminal device needs to be handed over from the second network node to the third network node, the first handover request message, the first handover request message, may be sent to the third network node. And indicating to the third network node that the terminal device needs to be handed over from the second network node to the third network node, where the third network node receives the first handover request message, and sends the first message to the first network node. Switch request confirmation message.
  • the method 200 further includes:
  • the terminal device sends a random access request to the first network node and the third network node.
  • the first network node and the third network node send a random access response to the terminal device.
  • the terminal device sends a radio resource control RRC establishment complete message to the first network node and the third network node.
  • the first network node sends the first indication information to the second network node, where the first indication information is used to indicate that the second network node releases the context information of the terminal device.
  • the switching method of the embodiment of the present application can ensure that the terminal device performs fast switching when the functions of the network device are separated into different network nodes.
  • FIG. 9 shows a schematic flowchart of a handover method 300 according to an embodiment of the present application.
  • the first network node may correspond to the CU in FIG. 4, and the second network node may correspond to the DU in FIG.
  • the method 300 includes:
  • the first network node determines that the terminal device needs to perform handover, where the handover is a handover from a first cell of the second network node to a second cell of the second network node, where the first network node includes a packet data convergence protocol layer.
  • the handover is a handover from a first cell of the second network node to a second cell of the second network node, where the first network node includes a packet data convergence protocol layer.
  • the second network node comprising at least one of a radio link layer control protocol layer, a media intervention control layer, and a physical layer function.
  • the method 300 further includes:
  • the terminal device sends a first message to the first network node, where the first message is used to request the first network node to switch the terminal device.
  • the first message may be a measurement report, or may be load information or interference information, and the application is not limited thereto.
  • the first network node determines, according to the first message, that the terminal device needs to perform the first cell from the second network node to the second cell of the second network node.
  • the first network node includes at least one of a packet data convergence protocol layer, a service data adaptation layer, and a radio resource control function
  • the second network node includes a radio link layer control protocol layer, a media intervention control layer, and a physical At least one of the layer functions.
  • the second network node is managed by the first network node.
  • the first network node sends wireless link change indication information to the second network node, where the wireless The link change indication information is used to indicate that the serving cell of the terminal device is handed over from the first cell to the second cell.
  • the first network node determines that the terminal device needs to perform a handover from the first cell of the second network node to the second cell of the second network node, and sends a wireless link change to the second network node.
  • the radio link change indication information is used to indicate that the second network node switches the serving cell of the terminal device from the first cell to the second cell.
  • the specific implementation of the radio link update indication message may also be a context modification request message of the terminal device, where the context modification request message of the terminal device includes a service cell for indicating that the terminal device is switched from the first cell to the first cell. Information about the two cells.
  • the second network node grasps all the information of successfully transmitting data, and data forwarding is not required when the inter-cell handover of the second network node.
  • the first network node sends a handover command to the terminal device, where the handover command is used to instruct the terminal device to perform the handover.
  • the method before the sending, by the first network node, the handover command to the terminal device, the method further includes:
  • the first network node sends a first handover request message to the second cell of the second network node.
  • the first network node receives a first handover request acknowledgement message sent by the second cell of the second network node.
  • the first network node may send the second cell to the second network node.
  • a first handover request message the first handover request message is used to indicate to the second cell of the second network node that the terminal device needs to switch from the first cell of the second network node to the second cell of the second network node.
  • the second cell of the second network node receives the first handover request message, and sends a first handover request acknowledgement message to the first network node.
  • the method 300 further includes:
  • the terminal device sends a random access request to the first network node and the second cell.
  • the first network node and the second cell send a random access response to the terminal device.
  • the terminal device sends a radio resource control RRC establishment complete message to the first network node and the second cell.
  • the first network node sends the second indication information to the first cell, where the second indication information is used to indicate that the first cell releases the context information of the terminal device.
  • the switching method of the embodiment of the present application can ensure that the terminal device performs fast switching when the functions of the network device are separated into different network nodes.
  • FIG. 10 shows a schematic flowchart of a handover method 400 according to an embodiment of the present application.
  • the first network node may correspond to a source control node (S-CU) in FIG. 5, and the second network node may correspond to a diagram.
  • a source data unit (S-DU) in 5 the third network node may correspond to a target data unit (T-DU) in FIG. 5, and the fourth network node may correspond to the target control node (S in FIG. 5) -CU), as shown in Figure 10, the method 400 includes:
  • the first network node determines that the terminal device needs to perform handover, where the handover is a handover from a second network node under control of the first network node to a third network node under control of the fourth network node, where the first network node and The fourth network node includes at least one of a packet data convergence protocol layer, a service data adaptation layer, and a radio resource control function, where the second network node and the third network node comprise a radio link layer control protocol layer, and media intervention At least one of a control layer and a physical layer function.
  • the method 400 further includes:
  • the terminal device sends a first message to the first network node, where the first message is used to request the first network node to switch the terminal device.
  • the first message may be a measurement report, or may be load information or interference information, and the application is not limited thereto.
  • the first network node determines, according to the first message, that the terminal device needs to perform control from the second network node under the control of the first network node to the fourth network node.
  • Switching of the third network node, the first network node and the fourth network node comprise at least one of a packet data convergence protocol layer, a service data adaptation layer, and a radio resource control function, the second network node and the first
  • the three network nodes include at least one of a radio link layer control protocol layer, a media intervention control layer, and a physical layer function.
  • the first network node sends radio link establishment indication information to the third network node, where the radio link setup indication information is used. Instructing the third network node to establish a wireless link for the terminal device.
  • the radio link setup indication information is used to indicate that the third network node establishes a radio link for the terminal device, where the radio link is a link from the first network node to the third network node.
  • the first network node when the first network node determines that the terminal device needs to be handed over from the second network node to the third network node, the first network node sends wireless link establishment indication information to the third network node, where The wireless link setup indication information is used to instruct the third network node to establish a wireless link for the terminal device, so that the first network node and/or the terminal device transmits data on the new wireless link.
  • the method 400 further includes:
  • the first network node receives a data sending status sent by the second network node, where the data sending status is used to indicate that the data sequence number that is not successfully sent to the terminal device is sent;
  • the first network node sends a data transmission status to the fourth network node.
  • the first network node determines that the terminal device switches from the second network node under the control of the first network node to the third network node under the control of the fourth network node
  • data forwarding that is, downlink data.
  • Data loss may occur when the transmission is switched from the first link (the first network node - the second network node - the terminal device) to the second link (the fourth network node - the third network node - the terminal device)
  • the first network node needs to retransmit the lost data, and the second network node may send an automatic repeat request (ARQ) to the first network node.
  • ARQ automatic repeat request
  • the second network node sends the The first network node sends a data transmission status, where the data transmission status is used to indicate that the data sequence number is not successfully sent to the terminal device, and the first network node forwards the data transmission status to the fourth network node, so as to facilitate the Transmitting, by the network node, the unsuccessfully transmitted data to the third network node, where the fourth network node follows the data transmission state to the third network node Data transmission is not successfully transmitted to the terminal device.
  • the first network node receives the data sent by the second network node, and determines the uplink data transmission status according to the data sent by the second network node.
  • the unsuccessfully transmitted data is also the entire data, and may be part or a segment of the entire data. If the unsent data is also the entire data, the terminal device first sends the first data state to the second network node. Reporting, the second network node can translate the first data status report into a data transmission status.
  • the first network node determines, according to the uplink data sent by the second network node, the uplink data transmission status of the terminal device, determines the sequence number of the successfully transmitted data, and sends the data sequence number that is not successfully sent. Giving the terminal device, so that the terminal device continues to send unsuccessfully transmitted data to the fourth network node after switching to the third network node.
  • the second network node translates the latest data status report into a data transmission status, and notifies the first data transmission status to the first Network node.
  • RLF Radio Link Failure
  • the first network node may identify the data transmission status, determine a data sequence number that is successfully sent, and send the unsuccessfully sent data to the third network node, and the third network node may not send the data successfully.
  • the data is sent to the terminal device.
  • the second network node is in addition to transmitting a data transmission status to the first network node, due to segmentation of data at the second network node or the third
  • the second network node further sends the data segmentation information to the third network node, and after receiving the segmentation information, the third network node may send the first network node unsuccessfully sent.
  • the data is segmented, and the data segment that has not been successfully transmitted is sent to the terminal device.
  • FIG. 11 is a schematic diagram of data forwarding in a CU-DU architecture.
  • Lost Radio Link Layer Control Protocol Data Units (Lost RLC PDUs) have two forms, one is a Lost RLC PDU, and the other is a Is the Lost RLC PDU segmentation (data segment).
  • the UE sends the original RLC status report (RLC status report) to the RLC entity (S-DU) of the first link ((S-CU)-(S-DU)-UE), by
  • the RLC entity of a link translates into a PDCP status report, telling the PDCP entity (S-CU) of the first link, and the S-CU forwards the PDCP status report to the second link ((T-CU)-(T- DU)-UE) PDCP entity (T-CU).
  • the RLC entity of the first link translates the latest RLC status report into a PDCP status report, telling the PDCP entity.
  • the S-CU or T-CU needs to try to identify the RLC status report: Lost RLC PDU, whose SN number corresponds to the PDCP SN number, so the S-DU only needs to inform the last SN number of consecutive RLC PDUs that the S-CU has received. , or the SN number of the first RLC PDU lost, or the SN number of the RLC PDU lost in consecutive RLC PDUs, and the SN number of the last RLC PDU received, so that the T-CU can pass the PDCP/RLC
  • the correspondence between the SN numbers directly converts the PDCP DU and the RLC PDU, and transmits data to be retransmitted to the T-DU.
  • the S-DU needs to send the PDCP status report to the S-CU, and also needs to send the data segmentation information to the T-DU. After receiving the data segmentation information, the T-DU can The retransmitted data sent by the CU is segmented, and the unsent data segment is sent to the terminal device.
  • the first network node sends a handover command to the terminal device, where the handover command is used to instruct the terminal device to perform the handover.
  • the method 200 further includes:
  • the terminal device establishes a first link and a second link, where the first link is a link from the first network node to a second network node, and the second link is from the fourth network node to The link of the third network node.
  • the first link and the second link comprise a radio resource control configuration, where the radio resource control configuration comprises at least one of a radio link layer control protocol layer, a media intervention control layer, and a physical layer.
  • the UE may establish two sets of protocol stacks before receiving the handover command, one set of activations (which may be the first link) and another set of deactivation (which may be the second chain) Path), when the UE needs to switch from the active link to the deactivated link, it quickly switches to the deactivated link. All configurations of the link to be activated at this time, including the RLC/MAC/PHY, have been configured at the beginning. When it is necessary to switch to the deactivated link, the deactivated link needs to be activated first, and the UE activates the link. A measurement is made to confirm that the deactivation link is feasible, and then the user plane data is directly transmitted.
  • the terminal device may measure and/or monitor the second link according to a certain period to ensure that the second link is quickly available.
  • the active link ((S-CU)-(S-DU)-UE) needs to switch to the deactivated link ((T-CU)-(T-DU)) after RLF occurs.
  • the UE may determine that the deactivation link is directly available according to the measurement report, and then directly transmit the user plane data.
  • the terminal device may measure and/or monitor the second link according to a certain period.
  • the terminal device may set a timer Timer3, and the deactivation chain is always used before the timer expires.
  • the path is measured and/or monitored.
  • the measurement and/or monitoring period can be adjusted to set a longer measurement and/or listening period than the current measurement period.
  • the terminal device in S431 may also establish a link, such as the foregoing first link, where the first link is a link from the first network node to the second network node, and the first link is wireless.
  • the link fails and the terminal device continues to measure and/or listen to the first link.
  • the UE saves all configurations, including the configuration of RLC/MAC/PHY, and the UE is always on this link. In the measurement or monitoring state. User plane data can be transmitted on this link immediately after the radio link recovery of the UE and the S-DU.
  • the terminal device sets a Timer4, and when the Timer4 does not time out, the configuration is retained and the measurement or monitoring state is maintained; when the Timer4 times out, the period of measurement or monitoring is extended. It saves resources and keeps the terminal device in the listening state for fast switching.
  • the method before the sending, by the first network node, the handover command to the terminal device, the method further includes:
  • the first network node sends a third handover request message to the fourth network node.
  • the first network node receives a third handover request acknowledgement message sent by the fourth network node.
  • the fourth network node sends a third handover request message, where the third handover request message is used to indicate to the fourth network node that the terminal device needs to be handed over from the second network node to the third network node, and the fourth network node receives The third handover request message sends a third handover request acknowledgement message to the first network node.
  • the method 400 further includes:
  • the terminal device sends a random access request to the third network node and the fourth network node.
  • the third network node and the fourth network node send a random access response to the terminal device.
  • the terminal device sends a radio resource control RRC establishment complete message to the third network node and the fourth network node.
  • the fourth network node sends third indication information to the first network node, where the third indication information is used to indicate that the second network node releases the context information of the terminal device;
  • the first network node sends the third indication information to the fourth network node.
  • the switching method in the embodiment of the present application can implement switching between CUs in the CU-DU architecture, and helps ensure normal communication of the terminal device under the CU-DU architecture.
  • the fourth network node also needs to request a handover to the core network node, which may be implemented by the following steps.
  • the fourth network node sends a fast handover request message to the core network node.
  • the core network node performs fast handover bearer management.
  • the core network node sends a fast handover request acknowledgement message to the fourth network node.
  • the switching method of the embodiment of the present application can ensure that the terminal device performs fast switching when the functions of the network device are separated into different network nodes.
  • FIG. 12 shows a schematic block diagram of a network device 500 according to an embodiment of the present application. As shown in FIG. 12, the network device 500 includes:
  • the processing module 510 is configured to determine that the terminal device needs to perform handover, where the handover is a handover from the second network node to the third network node, or the handover is from the first cell of the second network node to the second network node.
  • the first network node includes at least one of a packet data convergence protocol layer, a service data adaptation layer, and a radio resource control function
  • the second network node and the third network node include a radio link layer At least one of a control protocol layer, a media intervention control layer, and a physical layer function;
  • the transceiver module 520 is configured to: when the handover is a handover from the second network node to the third network node, the first network node sends radio link establishment indication information to the third network node, where the radio link is established.
  • the indication information is used to instruct the third network node to establish a wireless link for the terminal device;
  • the transceiver module 520 is further configured to: when the handover is a handover from a first cell of the second network node to a second cell of the second network node, the first network node sends a wireless link change to the second network node Instructing information, the radio link change indication information is used to indicate that the serving cell of the terminal device is handed over from the first cell to the second cell;
  • the transceiver module 520 is further configured to send, by the first network node, a handover command to the terminal device, where the handover command is used to instruct the terminal device to perform the handover.
  • the second network node and the third network node are managed by the first network node.
  • the transceiver module 520 is further configured to receive a data sending status sent by the second network node, where the data sending status is used to indicate The data sequence number is not sent to the terminal device; the transceiver module 520 is further configured to send, according to the data transmission status, the unsuccessfully transmitted data to the third network node under the control of the processing module 510.
  • the transceiver module 520 is further configured to:
  • the transceiver module 520 is further configured to:
  • the indication information is used to indicate that the second network node releases the context information of the terminal device.
  • the second network node is managed by the first network node
  • the third network node is managed by a fourth network node
  • the fourth network node comprises a packet data convergence protocol layer and a radio resource control function.
  • the transceiver module 520 is further configured to:
  • the transceiver module 520 is further configured to:
  • the transceiver module 520 is further configured to:
  • the indication information is used to indicate that the second network node releases the context information of the terminal device.
  • the network device in the embodiment of the present application can ensure that the terminal device performs fast handover when the functions of the network device are separated into different network nodes.
  • FIG. 13 is a schematic block diagram of a terminal device 600 according to an embodiment of the present application. As shown in FIG. 13, the terminal device 600 includes:
  • the transceiver module 610 is configured to send, to the first network node, a first message, where the first message is used to request the first network node to perform handover, and the handover is a handover from the second network node to the third network node. Or switching to a handover from a first cell of the second network node to a second cell of the second network node, the first network node comprising a packet data convergence protocol layer, a service data adaptation layer, and a radio resource control function At least one of the second network node and the third network node including at least one of a radio link layer control protocol layer, a media intervention control layer, and a physical layer function;
  • the transceiver module 610 is further configured to receive a handover command sent by the first network node, where the handover command is used to indicate the handover.
  • the second network node and the third network node are managed by the first network node.
  • the terminal device 600 further includes: a processor 620, configured to establish a first link and a second link, where the first link is a link from the first network node to the second network node, where The second link is a link from the first network node to the third network node;
  • the processor 620 is further configured to determine to switch from the first link to the second link;
  • the transceiver module 610 is further configured to transmit user plane data on the second link.
  • the processing module 620 is further configured to: the terminal device measures and/or listens to the second link according to the first period.
  • the processing module 620 is further configured to: establish a first link, where the first link is a link from the first network node to the second network node;
  • the processing module 620 is further configured to continue to measure and/or listen to the first link when the first link fails to generate a radio link;
  • the transceiver module 610 transmits user plane data on the first link when the first link returns to normal.
  • the transceiver module 610 is further configured to: send a random access request to the first network node and the third network node;
  • a radio resource control setup complete message is sent to the first network node and the third network node.
  • the second network node is managed by the first network node
  • the third network node is managed by a fourth network node
  • the fourth network node includes a packet data convergence protocol layer, a service data adaptation layer, and radio resource control. At least one of the functions.
  • the transceiver module 610 is further configured to: send a random access request to the third network node and the fourth network node;
  • a radio resource control setup complete message is sent to the third network node and the fourth network node.
  • the terminal device in the embodiment of the present application can ensure that the terminal device performs fast handover when the functions of the network device are separated into different network nodes.
  • FIG. 14 shows a schematic block diagram of a network device 700 according to an embodiment of the present application.
  • the network device 700 includes:
  • the transceiver module 710 is configured to receive a handover command sent by the first network node, where the handover command is used to instruct the terminal device to perform handover, where the handover is a handover from the second network node to the third network node, or the handover is from the first a handover of a first cell of the second network node to a second cell of the second network node, the first network node comprising at least one of a packet data convergence protocol layer, a service data adaptation layer, and a radio resource control function, the first
  • the second network node and the third network node include at least one of a radio link layer control protocol layer, a media intervention control layer, and a physical layer function;
  • the transceiver module 710 is further configured to receive, by the first network node, a wireless link change indication information, where the handover is performed from a first cell of the second network node to a second cell of the second network node.
  • the link change indication information is used to indicate that the serving cell of the terminal device is handed over from the first cell to the second cell;
  • the processing module 720 is configured to release the context information of the second network node according to the handover command.
  • the second network node and the third network node are managed by the first network node.
  • the second network node is managed by the first network node
  • the third network node is managed by a fourth network node
  • the fourth network node comprises a packet data convergence protocol layer and a radio resource control function.
  • the transceiver module 710 is further configured to:
  • the transceiver module 710 is further configured to:
  • the data segmentation information being used to indicate segmentation information of data that is not successfully transmitted to the terminal device.
  • the network device in the embodiment of the present application can ensure that the terminal device performs fast handover when the functions of the network device are separated into different network nodes.
  • FIG. 15 shows a schematic block diagram of a network device 800 according to an embodiment of the present application.
  • the network device 800 includes:
  • the transceiver module 810 is configured to receive a first handover request message sent by the first network node, where the first handover request message is used to indicate that the terminal device performs handover, where the handover is a handover from the second network node to the third network node, or The handover is a handover from a first cell of the second network node to a second cell of the second network node, where the first network node includes a packet data convergence protocol layer, a service data adaptation layer, and a radio resource control function. At least one of the second network node and the third network node comprising at least one of a radio link layer control protocol layer, a media intervention control layer, and a physical layer function;
  • the transceiver module 810 is further configured to receive, by the first network node, a radio link setup indication message, where the handover is a handover from the second network node to the third network node, where the radio link setup indication information is used to indicate The third network node establishes a wireless link for the terminal device;
  • the processing module 820 is configured to control the transceiver module 810 to send a first handover request acknowledgement message to the first network node, where the first handover request acknowledgement message is used to confirm that the handover is performed on the terminal device.
  • the second network node and the third network node are managed by the first network node.
  • the second network node is managed by the first network node
  • the third network node is managed by a fourth network node
  • the fourth network node comprises a packet data convergence protocol layer and a radio resource control function.
  • the transceiver module 810 is further configured to receive data segmentation information sent by the second network device, where the data segmentation information is used to indicate that the data segment is not successfully sent to the terminal device;
  • the processing module 820 is further configured to send, according to the data segmentation information, a data segment that is not successfully sent to the terminal device.
  • the network device in the embodiment of the present application can ensure that the terminal device performs fast handover when the functions of the network device are separated into different network nodes.
  • FIG. 16 shows a schematic block diagram of a network device 900 according to an embodiment of the present application.
  • the network device 900 includes:
  • the transceiver module 910 is configured to receive a second handover request message sent by the first network node, where the second handover request message is used to indicate that the terminal device performs handover, where the handover is a handover from the second network node to the third network node, where The second network node is managed by the first network node, and the third network node is managed by a fourth network node, where the first network node and the fourth network node comprise a packet data convergence protocol layer, a service data adaptation layer, and a radio resource. At least one of the control functions, the second network node and the third network node comprise at least one of a radio link layer control protocol layer, a media intervention control layer, and a physical layer function;
  • the transceiver module 910 is further configured to receive a data transmission status sent by the first network node, where the data transmission status is used to indicate to the terminal device, when the handover is performed from the second network node to the third network node. Successfully sent a successful data sequence number;
  • the processing module 920 is configured to control the transceiver module 910 to send a second handover request acknowledgement message to the first network node, where the second handover request acknowledgement message is used to confirm that the handover is performed on the terminal device.
  • the processor 920 is further configured to send the unsuccessfully sent data to the third network node according to the data sending status.
  • the transceiver module 910 is further configured to: receive a random access request sent by the terminal device;
  • the indication information is used to indicate that the second network node releases the context information of the terminal device.
  • the transceiver module 910 is further configured to: send a third handover request message to the core network node;
  • the network device in the embodiment of the present invention can ensure that the terminal device performs fast handover when the functions of the network device are separated into different network nodes.
  • FIG. 17 is a schematic structural diagram of a network device 1000 according to an embodiment of the present application.
  • the network device 1000 includes a processor 1001, a memory 1002, a receiver 1003, and a transmitter 1004. Communication between these components.
  • the memory 1002 is configured to store instructions for executing the instructions stored by the memory 1002, and controlling the receiver 1003 to receive information and to control the transmitter 1004 to transmit information.
  • the processor 1001 is configured to execute instructions stored by the memory 1002, and the processor 1001 can be used to perform corresponding operations and/or functions of the processing module 510 in the network device 500.
  • the receiver 1003 and the transmitter 1004 can be used for The corresponding operations and/or functions of the transceiver module 520 in the network device 500 are performed. For brevity, details are not described herein again.
  • FIG. 18 is a schematic structural diagram of a terminal device 1100 according to an embodiment of the present application.
  • the terminal device 1100 includes a processor 1101, a memory 1102, a receiver 1103, and a transmitter 1104. Communication between these components.
  • the memory 1102 is configured to store instructions
  • the processor 1101 is configured to execute instructions stored by the memory 1102, and control the receiver 1103 to receive information and control the transmitter 1104 to transmit information.
  • the processor 1101 is configured to execute instructions stored in the memory 1102, and the processor 1101 can be used to perform corresponding operations and/or functions of the processing module 620 in the terminal device 600.
  • the receiver 1103 and the transmitter 1104 can be used to The corresponding operations and/or functions of the transceiver module 610 in the terminal device 600 are performed. For brevity, details are not described herein again.
  • FIG. 19 is a schematic structural diagram of a network device 1200 according to an embodiment of the present application.
  • the network device 1200 includes a processor 1201, a memory 1202, a receiver 1203, and a transmitter 1204. Communication between these components.
  • the memory 1202 is configured to store instructions
  • the processor 1201 is configured to execute instructions stored by the memory 1202, and control the receiver 1203 to receive information and control the transmitter 1204 to transmit information.
  • the processor 1201 is configured to execute instructions stored by the memory 1202, and the processor 1201 can be used to perform corresponding operations and/or functions of the processing module 720 in the network device 700.
  • the receiver 1203 and the transmitter 1204 can be used to The corresponding operations and/or functions of the transceiver module 710 in the network device 700 are performed. For brevity, details are not described herein again.
  • FIG. 20 is a schematic structural diagram of a network device 1300 according to an embodiment of the present application.
  • the network device 1300 includes a processor 1301, a memory 1302, a receiver 1303, and a transmitter 1304. Communication between these components.
  • the memory 1302 is configured to store instructions
  • the processor 1301 is configured to execute the instructions stored by the memory 1302, and control the receiver 1303 to receive information and control the transmitter 1304 to transmit information.
  • the processor 1301 is configured to execute instructions stored by the memory 1302, and the processor 1301 can be used to perform corresponding operations and/or functions of the processing module 820 in the network device 800.
  • the receiver 1303 and the transmitter 1304 can be used to The corresponding operations and/or functions of the transceiver module 810 in the network device 800 are performed. For brevity, details are not described herein again.
  • FIG. 21 is a schematic structural diagram of a network device 1400 according to an embodiment of the present application.
  • the network device 1400 includes a processor 1401, a memory 1402, a receiver 1403, and a transmitter 1404. Communication between these components.
  • the memory 1402 is configured to store instructions
  • the processor 1401 is configured to execute instructions stored by the memory 1402, and control the receiver 1403 to receive information and control the transmitter 1404 to transmit information.
  • the processor 1401 is configured to execute instructions stored by the memory 1402, and the processor 1401 can be used to perform corresponding operations and/or functions of the processing module 920 in the network device 900.
  • the receiver 1403 and the transmitter 1404 can be used to The corresponding operations and/or functions of the transceiver module 910 in the network device 900 are performed. For brevity, details are not described herein again.
  • the embodiment of the present application further provides a system chip, where the system chip includes an input and output interface, at least one processor, at least one memory, and a bus, the at least one memory is configured to store an instruction, and the at least one processor is configured to invoke the at least one The instructions of the memory perform the operations of the methods of the various aspects described above.
  • a handover method includes: a first network node learns that a terminal device needs to perform handover, the handover is a handover from a second network node to a third network node, or the handover is from a second network node Switching of a cell to a second cell of the second network node, the first network node comprising at least one of a packet data convergence protocol layer, a service data adaptation layer, and a radio resource control function, the second network node and the The third network node includes at least one of a radio link layer control protocol layer, a media intervention control layer, and a physical layer function; when the handover is a handover from the second network node to the third network node, the first The network node sends the radio link setup indication information to the third network node, where the radio link setup indication information is used to indicate that the third network node establishes a radio link for the terminal device; when the handover is from the second network node When the first cell is switched to the second cell of the second network node
  • Embodiment 2 The method according to Embodiment 1, wherein the second network node and the third network node are managed by the first network node.
  • Embodiment 3 The method according to Embodiment 2, when the handover is a handover from the second network node to the third network node, the method further includes: the first network node receiving the second network node to send a data transmission status, the data transmission status is used to indicate that the data sequence number is not successfully transmitted to the terminal device; and the first network node sends the unsuccessfully transmitted data to the third network node according to the data transmission status.
  • Embodiment 4 The method according to Embodiment 3, before the first network node sends a handover command to the terminal device, the method further includes: the first network node sending a first handover request message to the third network node The first network node receives the first handover request acknowledgement message sent by the third network node.
  • Embodiment 5 The method according to Embodiment 3 or 4, after the first network node sends a handover command to the terminal device, the method further comprises: the first network node receiving the random access request sent by the terminal device The first network node sends a random access response to the terminal device; the first network node receives a radio resource control setup complete message sent by the terminal device; the first network node sends indication information to the second network node, where The indication information is used to indicate that the second network node releases the context information of the terminal device.
  • Embodiment 6 The method according to embodiment 1, wherein the second network node is managed by the first network node, the third network node is managed by a fourth network node, and the fourth network node comprises a packet data convergence protocol layer and Wireless resource control function.
  • the method when the switching is a handover from the second network node to the third network node, the method further includes: the first network node sending the fourth network node to the fourth network node And the data sending state, so that the fourth network node sends the unsuccessful data to the third network node, where the data sending status is used to indicate that the data sequence number is not successfully sent to the terminal device.
  • the method before the first network node sends a handover command to the terminal device, the method further includes: the first network node sending the second handover to the fourth network node a request message; the first network node receives a second handover request acknowledgement message sent by the fourth network node.
  • the method further includes: the first network node sending the indication information to the second network node,
  • the indication information is used to indicate that the second network node releases the context information of the terminal device.
  • Embodiment 10 A network device, comprising: a memory for storing an instruction; and a processor for invoking an instruction in the memory to perform the operation of the method according to any one of embodiments 1-9.
  • Embodiment 11 A handover method, comprising: the terminal device sends a first message to the first network node, where the first message is used to request the first network node to perform handover on the terminal device, where the handover is from the second network node a handover to a third network node, or the handover is a handover from a first cell of the second network node to a second cell of the second network node, the first network node comprising a packet data convergence protocol layer, and the service data is adapted At least one of a layering layer and a radio resource control function, the second network node and the third network node including at least one of a radio link layer control protocol layer, a media intervention control layer, and a physical layer function; the terminal device Receiving a handover command sent by the first network node, the handover command is used to indicate the handover.
  • Embodiment 12 The method of embodiment 11, wherein the second network node and the third network node are managed by the first network node.
  • Embodiment 13 The method according to embodiment 12, before the switching is a handover from the second network node to the third network node, before the terminal device receives the handover command sent by the first network node, the method The method further includes: establishing, by the terminal device, a first link and a second link, where the first link is a link from the first network node to a second network node, and the second link is from the first network node a link to the third network node; the terminal device determines to switch from the first link to the second link; the terminal device transmits data on the second link.
  • Embodiment 14 The method of embodiment 13, before the terminal device switches from the first link to the second link, the method further comprises: the terminal device measuring and/or listening to the first period according to the first period Second link.
  • Embodiment 15 The method of embodiment 14, before the switching to the handover from the second network node to the third network node, before the terminal device receives the handover command sent by the first network node, the method The method further includes: the terminal device establishes a first link, where the first link is a link from the first network node to the second network node; the first link fails to generate a radio link, and the terminal device continues to measure and / or listening to the first link; when the first link returns to normal, the terminal device transmits data on the first link.
  • the method further includes: the terminal device to the first network node and the The third network node sends a random access request; the terminal device receives the random access response sent by the first network node and the third network node; the terminal device sends the radio resource to the first network node and the third network node Control the setup completion message.
  • the second network node is managed by the first network node
  • the third network node is managed by a fourth network node
  • the fourth network node comprises a packet data convergence protocol layer, At least one of a service data adaptation layer and a radio resource control function.
  • Embodiment 18 The method of embodiment 17, when the switching is a handover from the second network node to the third network node, the method further comprising: the terminal device to the third network node and the The fourth network node sends a random access request; the terminal device receives the random access response sent by the third network node and the fourth network node; the terminal device sends the radio resource control to the third network node and the fourth network node Create a completion message.
  • Embodiment 19 A terminal device, comprising: a memory for storing an instruction; and a processor for invoking an instruction in the memory to perform the operation of the method according to any one of embodiments 11-18.
  • Embodiment 20 A handover method, comprising: receiving, by a second network node, a handover command sent by a first network node, where the handover command is used to instruct a terminal device to perform handover, where the handover is from a second network node to a third network node.
  • the first network node comprising a packet data convergence protocol layer, a service data adaptation layer, and radio resource control
  • the second network node and the third network node comprise at least one of a radio link layer control protocol layer, a media intervention control layer, and a physical layer function; when the handover is from the second network
  • the second network node receives the first network node to send radio link change indication information, where the radio link change indication information is used to indicate the terminal
  • the serving cell of the device is handed over from the first cell to the second cell; the second network node releases the second network node according to the handover command Text information.
  • Embodiment 21 The method of embodiment 20, wherein the second network node and the third network node are managed by the first network node.
  • Embodiment 22 The method of embodiment 20, wherein the second network node is managed by the first network node, the third network node is managed by a fourth network node, the fourth network node comprises a packet data convergence protocol layer and Wireless resource control function.
  • the method when the switching is a handover from the second network node to the third network node, the method further comprising: the second network node sending the first network node to the first network node a data transmission status, the data transmission status is used to indicate that the data sequence number is not successfully transmitted to the terminal device; or, when the handover is from the first cell of the second network node to the second cell of the second network node
  • the method further includes: the second network node receiving the cell change indication information sent by the first network node, where the cell change indication message is used to indicate that the serving cell of the terminal device is handed over from the first cell to the second cell.
  • Embodiment 24 A network device, comprising: a memory for storing an instruction; and a processor for invoking an instruction in the memory to perform the operation of the method of any one of embodiments 20-23.
  • Embodiment 25 A handover method, comprising: receiving, by a third network node, a first handover request message sent by a first network node, where the first handover request message is used to indicate that the terminal device performs handover, and the handover is from the second network node.
  • the handover is a handover from a first cell of the second network node to a second cell of the second network node, the first network node comprising a packet data convergence protocol layer, and the service data is adapted At least one of a layering layer and a radio resource control function, the second network node and the third network node including at least one of a radio link layer control protocol layer, a media intervention control layer, and a physical layer function;
  • the third network node receives the radio link establishment indication information sent by the first network node, and the radio link establishment indication information is used to indicate the third, when the handover is performed from the second network node to the third network node.
  • the network node establishes a wireless link for the terminal device; the third network node sends a first handover request acknowledgement message to the first network node, where the first cut Request confirmation message to confirm the handover of the terminal device.
  • Embodiment 26 The method of embodiment 25, wherein the second network node and the third network node are managed by the first network node.
  • Embodiment 27 A network device, comprising: a memory for storing an instruction; and a processor for invoking an instruction in the memory to perform the operation of the method according to Embodiment 25 or 26.
  • Embodiment 28 A handover method, comprising: receiving, by a fourth network node, a second handover request message sent by the first network node, where the second handover request message is used to indicate that the terminal device performs handover, and the handover is from the second network node.
  • the second network node is managed by the first network node
  • the third network node is managed by the fourth network node
  • the first network node and the fourth network node comprise a packet data convergence protocol layer At least one of a service data adaptation layer and a radio resource control function, the second network node and the third network node including at least one of a radio link layer control protocol layer, a media intervention control layer, and a physical layer function
  • the fourth network node receives a data transmission status sent by the first network node, where the data transmission status is used to indicate that the terminal device is not Sending a successful data sequence number; the fourth network node sends a second handover request acknowledgement message to the first network node, where the second handover is requested Acknowledgment message is used to confirm the handover of the terminal device.
  • Embodiment 30 A network device, comprising: a memory for storing an instruction; and a processor for invoking an instruction in the memory to perform the operation of the method according to Embodiment 28 or 29.
  • the expression “at least one of the following items: A, B, and C” is taken as an example, and unless otherwise specified, generally refers to the item.
  • the above is an example of three items A, B and C to illustrate the optional items of the item.
  • the expression is "the item includes at least one of the following: A, B, ..., and X", that is When there are more elements in the expression, then the items to which the item can be applied can also be obtained according to the aforementioned rules.
  • the processor may be an integrated circuit chip with signal processing capabilities.
  • each step of the foregoing method embodiment may be completed by an integrated logic circuit of hardware in a processor or an instruction in a form of software.
  • the processor may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a Field Programmable Gate Array (FPGA), or the like. Programming logic devices, discrete gates or transistor logic devices, discrete hardware components.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA Field Programmable Gate Array
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application may be directly implemented by the hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory, and the processor reads the information in the memory and combines the hardware to complete the steps of the above method.
  • the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory may be a read-only memory (ROM), a programmable read only memory (PROM), an erasable programmable read only memory (Erasable PROM, EPROM), or an electric Erase programmable read only memory (EEPROM) or flash memory.
  • the volatile memory can be a Random Access Memory (RAM) that acts as an external cache.
  • RAM Random Access Memory
  • many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (Synchronous DRAM).
  • SDRAM Double Data Rate SDRAM
  • DDR SDRAM Double Data Rate SDRAM
  • ESDRAM Enhanced Synchronous Dynamic Random Access Memory
  • SLDRAM Synchronous Connection Dynamic Random Access Memory
  • DR RAM direct memory bus random access memory
  • system and “network” are used interchangeably herein.
  • the term “and/or” in this context is merely an association describing the associated object, indicating that there may be three relationships, for example, A and / or B, which may indicate that A exists separately, and both A and B exist, respectively. B these three situations.
  • the character "/" in this article generally indicates that the contextual object is an "or" relationship.
  • B corresponding to A means that B is associated with A, and B can be determined according to A.
  • determining B from A does not mean that B is only determined based on A, and that B can also be determined based on A and/or other information.
  • the foregoing embodiment of the present application can implement the foregoing functions of the first network node, the second network node, the third network node, or the fourth network node by providing a network device, where the network device includes: A method of performing each method or action performed by a first network node, a second network node, a third network node, or a fourth network node in any of the methods of the preceding embodiments.
  • the unit included in the network device can be implemented by software and/or hardware. It can be understood that, in any of the methods and designs in the embodiments of the present application, each method or operation or step or action performed by the network device may be implemented by corresponding software or hardware, or a unit module of software and hardware. These unit modules are part of the radio access network equipment proposed by the present application.
  • the computer program product can include one or more computer instructions.
  • the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
  • the computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center Transfer to another website site, computer, server, or data center by wire (eg, coaxial cable, fiber optic, digital subscriber (DSL), or wireless (eg, infrared, wireless, microwave, etc.).
  • the computer readable storage medium can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or the like that includes one or more available media.
  • the usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic disk), an optical medium (eg, a DVD), or a semiconductor medium (such as a solid state disk (SSD)).
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • 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, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product.
  • the technical solution of the present application which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including
  • the instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present application.
  • the foregoing storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read only memory, a random access memory, a magnetic disk, or an optical disk.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

本申请提供了一种切换方法、终端设备和网络设备，该切换方法包括：第一网络节点获知终端设备需要进行切换，该切换为从第二网络节点到第三网络节点的切换，或该切换为从该第二网络节点的第一小区到该第二网络节点的第二小区的切换，该第一网络节点包括分组数据汇聚协议层、业务数据适配层和无线资源控制功能中的至少一种，该第二网络节点和该第三网络节点包括无线链路层控制协议层、媒体介入控制层和物理层功能中的至少一种；该第一网络节点向该终端设备发送切换命令，该切换命令用于指示该终端设备进行该切换。本申请实例的切换方法，可以在网络设备部分功能分离为不同网络节点时，保证终端设备进行正常的切换。

Description

一种切换的方法、终端设备及网络设备
本申请要求于2017年5月5日提交中国专利局、申请号为201710313955.6、申请名称为“一种切换的方法、终端设备及网络设备”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
本申请涉及领域通信领域，并且更具体地，涉及一种切换方法、终端设备及网络设备。
背景技术
云无线接入网(Cloud Radio Access Network，CRAN)架构下，引入了CRAN控制节点(Central Unit or Control Unit，CU)和数据单元(Date Unit or Distributed Unit，DU)的切分，也就是把原先的整体部署的基带处理单元(Building Base Band Unit，BBU)切分成了两部分。与原有的基站的架构相比，由于CU-DU之间的切分，引入了CU-DU之间的接口。原先在基站内部交互的信息就需要通过CU-DU之间的接口传递。
对于一些重要的无线通信过程，比如切换(Handover，HO)流程，包括CU内(Intra-CU)的切换，DU内(Intra-DU)的切换，CU间(Inter-CU)的切换，原来由整个基站统一处理。但是现在由于基站架构的改变，具体的处理过程和处理模块需要重新设计，另外还涉及到切分后两个模块之间的协调。
CU-DU切分架构下，HO流程涉及CU内的切换流程、DU内的切换流程以及CU间的切换流程，各个流程如何来实现，这些都涉及HO方案的重新设计，以及设计方案的优化。
现有技术下无法解决网络设备部分功能分离为不同网络节点时终端设备进行切换的问题。
发明内容
本申请提供一种切换的方法、终端设备和网络设备，能够在网络设备部分功能分离为不同网络节点时，保证终端设备进行正常的切换。
第一方面，提供了一种切换方法，其特征在于，包括：第一网络节点获知终端设备需要进行切换，该切换为从第二网络节点到第三网络节点的切换，或该切换为从该第二网络节点的第一小区到该第二网络节点的第二小区的切换，该第一网络节点包括分组数据汇聚协议层、业务数据适配层和无线资源控制功能中的至少一种，该第二网络节点和该第三网络节点包括无线链路层控制协议层、媒体介入控制层和物理层功能中的至少一种；当该切换为从该第二网络节点到该第三网络节点的切换时，该第一网络节点向该第三网络节点发送无线链路建立指示信息，该无线链路建立指示信息用于指示第三网络节点为该终端设备建立无线链路；当该切换为从该第二网络节点的第一小区到该第二网络节点的第二小区的切换时，该第一网络节点向第二网络节点发送无线链路更改指示信息，该无线链路更改指 示信息用于指示该终端设备的服务小区从该第一小区切换至该第二小区；该第一网络节点向该终端设备发送切换命令，该切换命令用于指示该终端设备进行该切换。
结合第一方面，在第一方面的第一种可能的实现方式中，该第二网络节点和该第三网络节点由该第一网络节点管理。
结合第一方面的第一种可能的实现方式，在第一方面的第二种可能的实现方式中，在该切换为从该第二网络节点到该第三网络节点的切换时，该方法还包括：该第一网络节点接收该第二网络节点发送的数据发送状态，该数据发送状态用于指示向该终端设备未发送成功的数据序列号；该第一网络节点根据该数据发送状态，向该第三网络节点发送该未发送成功的数据。
在一些可能的实现方式中，该第一网络节点根据该第二网络节点发送的数据，确定该终端设备的数据发送状态，该数据发送状态用于指示未发送成功的数据序列号；该第一网络节点向该终端设备发送该未发送成功的数据序列号，以便于该终端设备在切换到第三网络节点后将该未发送成功的数据继续发送给第一网络节点。
结合第一方面的第二种可能的实现方式，在第一方面的第三种可能的实现方式中，在该第一网络节点向该终端设备发送切换命令之前，该方法还包括：该第一网络节点向该第三网络节点发送第一切换请求消息；该第一网络节点接收该第三网络节点发送的第一切换请求确认消息。
结合第一方面的第二种或第三种可能的实现方式，在第一方面的第四种可能的实现方式中，在该第一网络节点向该终端设备发送切换命令之后，该方法还包括：该第一网络节点接收该终端设备发送的随机接入请求；该第一网络节点向该终端设备发送随机接入响应；该第一网络节点接收该终端设备发送的无线资源控制建立完成消息；该第一网络节点向该第二网络节点发送指示信息，该指示信息用于指示该第二网络节点释放该终端设备的上下文信息。
结合第一方面，在第一方面的第五种可能的实现方式中，该第二网络节点由该第一网络节点管理，该第三网络节点由第四网络节点管理，该第四网络节点包括分组数据汇聚协议层和无线资源控制功能。
结合第一方面的第五种可能的实现方式，在第一方面的第六种可能的实现方式中，在该切换为从该第二网络节点到该第三网络节点的切换时，该方法还包括：该第一网络节点接收该第二网络节点发送的数据发送状态，该数据发送状态用于指示向该终端设备未发送成功的数据；该第一网络节点向该第四网络节点发送该数据发送状态，以便于该第四网络节点向该第三网络节点发送该未发送成功的数据，所述数据发送状态用于指示向所述终端设备未发送成功的数据序列号。
结合第一方面的第五种或第六种可能的实现方式，在第一方面的第七种可能的实现方式中，在该第一网络节点向该终端设备发送切换命令之前，该方法还包括：该第一网络节点向该第四网络节点发送第二切换请求消息；该第一网络节点接收该第四网络节点发送的第二切换请求确认消息。
结合第一方面的第六种或第七种可能的实现方式，在第一方面的第八种可能的实现方式中，在该第一网络节点向该终端设备发送切换命令之后，该方法还包括：该第一网络节点向该第二网络节点发送指示信息，该指示信息用于指示该第二网络节点释放该终端设备 的上下文信息。
本申请实施例的切换方法，能够在网络设备部分功能分离为不同网络节点时，保证终端设备进行正常的切换。
第二方面，提供了一种网络设备，该网络设备包括存储器和处理器，该存储器用于存储指令，该处理器用于调用该存储器中的指令，以进行上述第一方面或第一方面的任一种可能的实现方式中的方法中的操作。
第三方面，提供了一种切换方法，该方法包括：终端设备向第一网络节点发送第一消息，该第一消息用于向第一网络节点请求对该终端设备进行切换，该切换为从第二网络节点到第三网络节点的切换，或该切换为从该第二网络节点的第一小区到该第二网络节点的第二小区的切换，该第一网络节点包括分组数据汇聚协议层、业务数据适配层和无线资源控制功能中的至少一种，该第二网络节点和该第三网络节点包括无线链路层控制协议层、媒体介入控制层和物理层功能中的至少一种；该终端设备接收该第一网络节点发送的切换命令，该切换命令用于指示该切换。
结合第三方面，在第三方面的第一种可能的实现方式中，该第二网络节点和该第三网络节点由该第一网络节点管理。
在一些可能的实现方式中，在该切换为从该第二网络节点到该第三网络节点的切换时，该终端设备接收该第一网络节点发送的未发送成功的数据序列号，以便于该终端设备在切换到第三网络节点后将未发送成功的数据继续发送给该第一网络节点。
结合第三方面的第一种可能的实现方式，在第三方面的第二种可能的实现方式中，在该切换为从该第二网络节点到该第三网络节点的切换时，该终端设备接收该第一网络节点发送的切换命令之前，该方法还包括：该终端设备建立第一链路和第二链路，该第一链路为从该第一网络节点到第二网络节点的链路，该第二链路为从该第一网络节点到该第三网络节点的链路；该第一链路发生无线链路失败，该终端设备确定从该第一链路切换到该第二链路；该终端设备在该第二链路上传输数据。
结合第三方面的第二种可能的实现方式，在第三方面的第三种可能的实现方式中，在该终端设备从该第一链路切换到该第二链路之前，该方法还包括：该终端设备按照第一周期测量和/或监听该第二链路。
结合第三方面的第一种可能的实现方式，在第三方面的第四种可能的实现方式中，在该切换为从该第二网络节点到该第三网络节点的切换时，该终端设备接收该第一网络节点发送的切换命令之前，该方法还包括：该终端设备建立第一链路，该第一链路为从该第一网络节点到第二网络节点的链路；该第一链路发生无线链路失败，该终端设备继续测量和/或监听该第一链路；在该第一链路恢复正常时，该终端设备在该第一链路上传输数据。
结合第三方面的第二种至第四种可能的实现方式中的任一种可能的实现方式，在第三方面的第五种可能的实现方式中，该终端设备接收该第一网络节点发送的切换命令之后，该方法还包括：该终端设备向该第一网络节点和该第三网络节点发送随机接入请求；该终端设备接收该第一网络节点和该第三网络节点发送的随机接入响应；该终端设备向该第一网络节点和该第三网络节点发送无线资源控制建立完成消息。
结合第三方面，在第三方面的第六种可能的实现方式中，该第二网络节点由该第一网络节点管理，该第三网络节点由第四网络节点管理，该第四网络节点包括分组数据汇聚协 议层、业务数据适配层和无线资源控制功能中的至少一种。
结合第三方面的第六种可能的实现方式，在第三方面的第七种可能的实现方式中，在该切换为从该第二网络节点到该第三网络节点的切换时，该方法还包括：该终端设备向该第三网络节点和该第四网络节点发送随机接入请求；该终端设备接收该第三网络节点和该第四网络节点发送的随机接入响应；该终端设备向该第三网络节点和该第四网络节点发送无线资源控制建立完成消息。
本申请实施例的切换方法，能够在网络设备部分功能分离为不同网络节点时，保证终端设备进行正常的切换。
第四方面，提供了一种终端设备，该终端设备包括存储器和处理器，该存储器用于存储指令，该处理器用于调用该存储器中的指令，以进行上述第三方面或第三方面的任一种可能的实现方式中的方法中的操作。
第五方面，提供了一种切换方法，该方法包括：第二网络节点接收第一网络节点发送的切换命令，该切换命令用于指示终端设备进行切换，该切换为从第二网络节点到第三网络节点的切换，或该切换为从该第二网络节点的第一小区到该第二网络节点的第二小区的切换，该第一网络节点包括分组数据汇聚协议层、业务数据适配层和无线资源控制功能中的至少一种，该第二网络节点和该第三网络节点包括无线链路层控制协议层、媒体介入控制层和物理层功能中的至少一种；当该切换为从该第二网络节点的第一小区到该第二网络节点的第二小区的切换时，该第二网络节点接收该第一网络节点发送无线链路更改指示信息，该无线链路更改指示信息用于指示该终端设备的服务小区从该第一小区切换至该第二小区；该第二网络节点根据该切换命令，释放该第二网络节点的上下文信息。
结合第五方面，在第五方面的第一种可能的实现方式中，该第二网络节点和该第三网络节点由该第一网络节点管理。
结合第五方面，在第五方面的第二种可能的实现方式中，该第二网络节点由该第一网络节点管理，该第三网络节点由第四网络节点管理，该第四网络节点包括分组数据汇聚协议层和无线资源控制功能。
结合第五方面第一种或第二种可能的实现方式，在第五方面的第三种可能的实现方式中，在该切换为从第二网络节点到第三网络节点的切换时，该方法还包括：该第二网络节点向该第一网络节点发送数据发送状态，该数据发送状态用于指示向该终端设备未发送成功的数据序列号。
本申请实施例的切换方法，能够在网络设备部分功能分离为不同网络节点时，保证终端设备进行正常的切换。
第六方面，提供了一种网络设备，该网络设备包括存储器和处理器，该存储器用于存储指令，该处理器用于调用该存储器中的指令，以进行上述第五方面或第五方面的任一种可能的实现方式中的方法中的操作。
第七方面，提供了一种切换方法，该方法包括：第三网络节点接收第一网络节点发送的第一切换请求消息，该第一切换请求消息用于指示终端设备进行切换，该切换为从第二网络节点到第三网络节点的切换，或该切换为从该第二网络节点的第一小区到该第二网络节点的第二小区的切换，该第一网络节点包括分组数据汇聚协议层、业务数据适配层和无线资源控制功能中的至少一种，该第二网络节点和该第三网络节点包括无线链路层控制协 议层、媒体介入控制层和物理层功能中的至少一种；当该切换为从该第二网络节点到该第三网络节点的切换时，该第三网络节点接收该第一网络节点发送的无线链路建立指示信息，该无线链路建立指示信息用于指示第三网络节点为该终端设备建立无线链路；该第三网络节点向该第一网络节点发送第一切换请求确认消息，该第一切换请求确认消息用于确认对该终端设备进行该切换。
结合第七方面，在第七方面的第一种可能的实现方式中，该第二网络节点和该第三网络节点由该第一网络节点管理。
结合第七方面，在第七方面的第二种可能的实现方式中，该第二网络节点由该第一网络节点管理，该第三网络节点由第四网络节点管理，该第四网络节点包括分组数据汇聚协议层和无线资源控制功能。
结合第七方面的第一种或第二种可能的实现方式，在第七方面的第三种可能的实现方式中，在该切换为从第二网络节点到第三网络节点的切换时，该方法还包括：该第三网络节点结接收该第二网络设备发送的数据分段信息，该数据分段信息用于指示向该终端设备未发送成功的数据段。
本申请实施例的切换方法，能够在网络设备部分功能分离为不同网络节点时，保证终端设备进行正常的切换。
第八方面，提供了一种网络设备，该网络设备包括存储器和处理器，该存储器用于存储指令，该处理器用于调用该存储器中的指令，以进行上述第七方面或第七方面的任一种可能的实现方式中的方法中的操作。
第九方面，提供了一种切换方法，该方法包括：第四网络节点接收第一网络节点发送的第二切换请求消息，该第二切换请求消息用于指示终端设备进行切换，该切换为从第二网络节点到第三网络节点的切换，该第二网络节点由该第一网络节点管理，该第三网络节点由第四网络节点管理，该第一网络节点和该第四网络节点包括分组数据汇聚协议层、业务数据适配层和无线资源控制功能中的至少一种，该第二网络节点和该第三网络节点包括无线链路层控制协议层、媒体介入控制层和物理层功能中的至少一种；当该切换为从该第二网络节点到该第三网络节点的切换时，该第四网络节点接收该第一网络节点发送的数据发送状态，该数据发送状态用于指示向该终端设备未发送成功的数据序列号；该第四网络节点向该第一网络节点发送第二切换请求确认消息，该第二切换请求确认消息用于确认对该终端设备进行该切换。
结合第九方面，在第九方面的第一种可能的实现方式中，该方法还包括：该第四网络节点根据该数据发送状态，向该第三网络节点发送该未发送成功的数据。
结合第九方面或第九方面的第一种可能的实现方式，在第九方面的第二种可能的实现方式中，该方法还包括：该第四网络节点接收该终端设备发送的随机接入请求；该第四网络节点向该终端设备发送随机接入响应；该第四网络节点接收该终端设备发送的无线资源控制建立完成消息；该第四网络节点向该第一网络节点发送指示信息，该指示信息用于指示该第二网络节点释放该终端设备的上下文信息。
结合第九方面、第九方面的第一种和第二种可能的实现方式中的任一种可能的实现方式，在第九方面的第三种可能的实现方式中，该方法还包括：该第四网络节点向核心网发送第三切换请求消息；该第四网络节点接收核心网发送的第三切换请求确认消息。
本申请实施例的切换方法，能够在网络设备部分功能分离为不同网络节点时，保证终端设备进行正常的切换。
第十方面，提供了一种网络设备，该网络设备包括存储器和处理器，该存储器用于存储指令，该处理器用于调用该存储器中的指令，以进行上述第九方面或第九方面的任一种可能的实现方式中的方法中的操作。
第十一方面，提供了一种网络设备，该网络设备包括：处理模块，用于获知终端设备需要进行切换，该切换为从第二网络节点到第三网络节点的切换，或该切换为从该第二网络节点的第一小区到该第二网络节点的第二小区的切换，该第一网络节点包括分组数据汇聚协议层、业务数据适配层和无线资源控制功能中的至少一种，该第二网络节点和该第三网络节点包括无线链路层控制协议层、媒体介入控制层和物理层功能中的至少一种；收发模块，用于当该切换为从该第二网络节点到该第三网络节点的切换时，向该第三网络节点发送无线链路建立指示信息，该无线链路建立指示信息用于指示第三网络节点为该终端设备建立无线链路；该收发模块还用于当该切换为从该第二网络节点的第一小区到该第二网络节点的第二小区的切换时，向第二网络节点发送无线链路更改指示信息，该无线链路更改指示信息用于指示该终端设备的服务小区从该第一小区切换至该第二小区；该收发模块还用于向该终端设备发送切换命令，该切换命令用于指示该终端设备进行该切换。
结合第十一方面，在第十一方面的第一种可能的实现方式中，该第二网络节点和该第三网络节点由该第一网络节点管理。
结合第十一方面的第一种可能的实现方式，在第十一方面的第二种可能的实现方式中，在该切换为从该第二网络节点到该第三网络节点的切换时，该收发模块还用于接收该第二网络节点发送的数据发送状态，该数据发送状态用于指示向该终端设备未发送成功的数据序列号；该处理模块还用于根据该数据发送状态，向该第三网络节点发送该未发送成功的数据。
结合第十一方面的第二种可能的实现方式，在第十一方面的第三种可能的实现方式中，该收发模块还用于向该第三网络节点发送第一切换请求消息；该收发模块还用于接收该第三网络节点发送的第一切换请求确认消息。
结合第十一方面的第二种或第三种可能的实现方式，在第十一方面的第四种可能的实现方式中，该收发模块还用于接收该终端设备发送的随机接入请求；该收发模块还用于向该终端设备发送随机接入响应；该收发模块还用于接收该终端设备发送的无线资源控制建立完成消息；该收发模块还用于向该第二网络节点发送指示信息，该指示信息用于指示该第二网络节点释放该终端设备的上下文信息。
结合第十一方面，在第十一方面的第五种可能的实现方式中，该第二网络节点由该第一网络节点管理，该第三网络节点由第四网络节点管理，该第四网络节点包括分组数据汇聚协议层和无线资源控制功能。
结合第十一方面的第五种可能的实现方式，在第十一方面的第六种可能的实现方式中，该收发模块还用于接收该第二网络节点发送的数据发送状态，该数据发送状态用于指示向该终端设备未发送成功的数据；该收发模块还用于向该第四网络节点发送该数据发送状态，以便于该第四网络节点向该第三网络节点发送该未发送成功的数据。
结合第十一方面的第五种或第六种可能的实现方式，在第十一方面的第七种可能的实 现方式中，该收发模块还用于向该第四网络节点发送第二切换请求消息；该收发模块还用于接收该第四网络节点发送的第二切换请求确认消息。
结合第十一方面的第六种或第七种可能的实现方式，在第十一方面的第八种可能的实现方式中，该收发模块还用于向该第二网络节点发送指示信息，该指示信息用于指示该第二网络节点释放该终端设备的上下文信息。
本申请实施例的网络设备，能够在网络设备部分功能分离为不同网络节点时，保证终端设备进行正常的切换。
第十二方面，提供了一种终端设备，该终端设备包括：收发模块，用于向第一网络节点发送第一消息，该第一消息用于向第一网络节点请求对该终端设备进行切换，该切换为从第二网络节点到第三网络节点的切换，或该切换为从该第二网络节点的第一小区到该第二网络节点的第二小区的切换，该第一网络节点包括分组数据汇聚协议层、业务数据适配层和无线资源控制功能中的至少一种，该第二网络节点和该第三网络节点包括无线链路层控制协议层、媒体介入控制层和物理层功能中的至少一种；该收发模块还用于接收该第一网络节点发送的切换命令，该切换命令用于指示该切换。
结合第十二方面，在第十二方面的第一种可能的实现方式中，该第二网络节点和该第三网络节点由该第一网络节点管理。
在一些可能的实现方式中，在该切换为从该第二网络节点到该第三网络节点的切换时，该收发模块还用于接收该第一网络节点发送的未发送成功的数据序列号，以便于该终端设备在切换到第三网络节点后将未发送成功的数据继续发送给该第一网络节点。
结合第十二方面的第一种可能的实现方式，在第十二方面的第二种可能的实现方式中，在该切换为从该第二网络节点到该第三网络节点的切换时，该终端设备还包括：处理模块，用于建立第一链路和第二链路，该第一链路为从该第一网络节点到第二网络节点的链路，该第二链路为从该第一网络节点到该第三网络节点的链路；该第一链路发生无线链路失败，该处理模块还用于确定从该第一链路切换到该第二链路；该收发模块还用于在该第二链路上传输数据。
结合第十二方面的第二种可能的实现方式，在第十二方面的第三种可能的实现方式中，该处理模块还用于按照第一周期测量和/或监听该第二链路。
结合第十二方面的第一种可能的实现方式，在第十二方面的第四种可能的实现方式中，在该切换为从该第二网络节点到该第三网络节点的切换时，该处理模块还用于建立第一链路，该第一链路为从该第一网络节点到第二网络节点的链路；该第一链路发生无线链路失败，该处理模块还用于继续测量和/或监听该第一链路；在该第一链路恢复正常时，该收发模块还用于在该第一链路上传输数据。
结合第十二方面的第二种至第四种可能的实现方式中的任一种可能的实现方式，在第十二方面的第五种可能的实现方式中，该收发模块还用于向该第一网络节点和该第三网络节点发送随机接入请求；该收发模块还用于接收该第一网络节点和该第三网络节点发送的随机接入响应；该收发模块还用于向该第一网络节点和该第三网络节点发送无线资源控制建立完成消息。
结合第十二方面，在第十二方面的第六种可能的实现方式中，该第二网络节点由该第一网络节点管理，该第三网络节点由第四网络节点管理，该第四网络节点包括分组数据汇 聚协议层、业务数据适配层和无线资源控制功能中的至少一种。
结合第十二方面的第六种可能的实现方式，在第十二方面的第七种可能的实现方式中，在该切换为从该第二网络节点到该第三网络节点的切换时，该收发模块还用于向该第三网络节点和该第四网络节点发送随机接入请求；该收发模块还用于接收该第三网络节点和该第四网络节点发送的随机接入响应；该收发模块还用于向该第三网络节点和该第四网络节点发送无线资源控制建立完成消息。
本申请实施例的网络设备，能够在网络设备部分功能分离为不同网络节点时，保证终端设备进行正常的切换。
第十三方面，提供了一种网络设备，该网络设备包括：收发模块，用于接收第一网络节点发送的切换命令，该切换命令用于指示终端设备进行切换，该切换为从第二网络节点到第三网络节点的切换，或该切换为从该第二网络节点的第一小区到该第二网络节点的第二小区的切换，该第一网络节点包括分组数据汇聚协议层、业务数据适配层和无线资源控制功能中的至少一种，该第二网络节点和该第三网络节点包括无线链路层控制协议层、媒体介入控制层和物理层功能中的至少一种；当该切换为从该第二网络节点的第一小区到该第二网络节点的第二小区的切换时，该收发模块还用于接收该第一网络节点发送无线链路更改指示信息，该无线链路更改指示信息用于指示该终端设备的服务小区从该第一小区切换至该第二小区；处理模块，用于根据该切换命令，释放该第二网络节点的上下文信息。
结合第十三方面，在第十三方面的第一种可能的实现方式中，该第二网络节点和该第三网络节点由该第一网络节点管理。
结合第十三方面，在第十三方面的第二种可能的实现方式中，该第二网络节点由该第一网络节点管理，该第三网络节点由第四网络节点管理，该第四网络节点包括分组数据汇聚协议层和无线资源控制功能。
结合第十三方面第一种或第二种可能的实现方式，在第十三方面的第三种可能的实现方式中，在该切换为从第二网络节点到第三网络节点的切换时，该收发模块还用于向该第一网络节点发送数据发送状态，该数据发送状态用于指示向该终端设备未发送成功的数据序列号。
本申请实施例的网络设备，能够在网络设备部分功能分离为不同网络节点时，保证终端设备进行正常的切换。
第十四方面，提供了一种网络设备，该网络设备包括：收发模块，用于接收第一网络节点发送的第一切换请求消息，该第一切换请求消息用于指示终端设备进行切换，该切换为从第二网络节点到第三网络节点的切换，或该切换为从该第二网络节点的第一小区到该第二网络节点的第二小区的切换，该第一网络节点包括分组数据汇聚协议层、业务数据适配层和无线资源控制功能中的至少一种，该第二网络节点和该第三网络节点包括无线链路层控制协议层、媒体介入控制层和物理层功能中的至少一种；当该切换为从该第二网络节点到该第三网络节点的切换时，该收发模块还用于接收该第一网络节点发送的无线链路建立指示信息，该无线链路建立指示信息用于指示第三网络节点为该终端设备建立无线链路；处理模块，用于控制该收发模块向该第一网络节点发送第一切换请求确认消息，该第一切换请求确认消息用于确认对该终端设备进行该切换。
结合第十四方面，在第十四方面的第一种可能的实现方式中，该第二网络节点和该第 三网络节点由该第一网络节点管理。
结合第十四方面，在第十四方面的第二种可能的实现方式中，该第二网络节点由该第一网络节点管理，该第三网络节点由第四网络节点管理，该第四网络节点包括分组数据汇聚协议层和无线资源控制功能。
结合第十四方面的第一种或第二种可能的实现方式，在第十四方面的第三种可能的实现方式中，在该切换为从第二网络节点到第三网络节点的切换时，该收发模块还用于接收该第二网络设备发送的数据分段信息，该数据分段信息用于指示向该终端设备未发送成功的数据段。
本申请实施例的网络设备，能够在网络设备部分功能分离为不同网络节点时，保证终端设备进行正常的切换。
第十五方面，提供了一种网络设备，该方法包括：收发模块，用于接收第一网络节点发送的第二切换请求消息，该第二切换请求消息用于指示终端设备进行切换，该切换为从第二网络节点到第三网络节点的切换，该第二网络节点由该第一网络节点管理，该第三网络节点由第四网络节点管理，该第一网络节点和该第四网络节点包括分组数据汇聚协议层、业务数据适配层和无线资源控制功能中的至少一种，该第二网络节点和该第三网络节点包括无线链路层控制协议层、媒体介入控制层和物理层功能中的至少一种；当该切换为从该第二网络节点到该第三网络节点的切换时，该收发模块还用于接收该第一网络节点发送的数据发送状态，该数据发送状态用于指示向该终端设备未发送成功的数据序列号；处理模块，用于控制该收发模块向该第一网络节点发送第二切换请求确认消息，该第二切换请求确认消息用于确认对该终端设备进行该切换。
结合第十五方面，在第十五方面的第一种可能的实现方式中，该收发模块还用于在该处理模块的控制下根据该数据发送状态，向该第三网络节点发送该未发送成功的数据。
结合第十五方面或第九方面的第一种可能的实现方式，在第十五方面的第二种可能的实现方式中，该收发模块还用于接收该终端设备发送的随机接入请求；该收发模块还用于向该终端设备发送随机接入响应；该收发模块还用于接收该终端设备发送的无线资源控制建立完成消息；该收发模块还用于向该第一网络节点发送指示信息，该指示信息用于指示该第二网络节点释放该终端设备的上下文信息。
结合第十五方面、第十五方面的第一种和第二种可能的实现方式中的任一种可能的实现方式，在第十五方面的第三种可能的实现方式中，该收发模块还用于向核心网发送第三切换请求消息；该收发模块还用于接收核心网发送的第三切换请求确认消息。
本申请实施例的网络设备，能够在网络设备部分功能分离为不同网络节点时，保证终端设备进行正常的切换。
第十六方面，提供了一种计算机可读存储介质，所述计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机执行上述各个方面的所述的方法。
第十七方面，提供了一种系统芯片，该系统芯片包括输入输出接口、至少一个处理器、至少一个存储器和总线，该至少一个存储器用于存储指令，该至少一个处理器用于调用该至少一个存储器的指令，以进行上述各个方面的方法的操作。
附图说明
图1是根据本申请实施例的技术方案的一种应用场景的示意图。
图2是根据本申请实施例的技术方案的另一种应用场景的示意图。
图3是根据本申请实施例的技术方案的再一种应用场景的示意图。
图4是根据本申请实施例的技术方案的再一种应用场景的示意图。
图5是根据本申请实施例的技术方案的再一种应用场景的示意图。
图6示出了根据本申请实施例的切换方法的示意性流程图。
图7示出了根据本申请实施例的切换方法的再一示意性流程图。
图8示出了根据本申请实施例的数据状态转发的示意性图。
图9示出了根据本申请实施例的切换方法的再一示意性流程图。
图10示出了根据本申请实施例的切换方法的再一示意性流程图。
图11示出了根据本申请实施例的数据状态转发的另一示意性图。
图12是根据本申请实施例的网络设备的示意性框图。
图13是根据本申请实施例的终端设备的示意性框图。
图14是根据本申请实施例的网络设备的另一示意性框图。
图15是根据本申请实施例的网络设备的再一示意性框图。
图16是根据本申请实施例的网络设备的再一示意性框图。
图17是根据本申请实施例的网络设备的示意性框图。
图18是根据本申请实施例的终端设备的示意性框图。
图19是根据本申请实施例的网络设备的另一示意性框图。
图20是根据本申请实施例的网络设备的再一示意性框图。
图21是根据本申请实施例的网络设备的再一示意性框图。
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。
本申请实施例适用于各种形式的包含网络设备中部分功能分离的系统，图1示出了本申请实施例的技术方案的一种应用场景的示意图，如图1所示，该网络设备中部分功能分离为第一网络节点和第二网络节点。
具体地，图2示出了本申请实施例的技术方案的另一种应用场景的示意图，如图2所示，在CRAN架构中，引入了CU-DU的切分，DU可以对应于图1中的第一网络节点，CU对应于图1中的第二网络节点。
应理解，第一网络节点和第二网络节点可以是一个整体网络架构中的两个物理或者逻辑分离模块，也可以是完全独立的两个逻辑网元。
还应理解，本申请实施例适用于CU-DU架构下的各种切换流程，包括但不限于CU内(Intra-CU)的切换，DU内(Intra-DU)的切换，CU间(Inter-CU)的切换。
图3示出了本申请实施例的技术方案的再一种应用场景的示意图，该应用场景主要涉及CU内部的切换。
图4示出了本申请实施例的技术方案的再一种应用场景的示意图，该应用场景主要涉及DU内部的切换。
图5示出了本申请实施例的技术方案的再一种应用场景的示意图，该应用场景主要涉 及CU间的切换。
CU具有无线资源控制(Radio Resource Control，RRC)或者部分RRC控制功能，包含现有基站的所有的协议层功能或者部分协议层功能；比如只包含RRC功能或者部分RRC功能，或者包含RRC功能或者业务数据适配协议(Service Data Adaptation Protocol,SDAP)层功能，或者包含RRC/分组数据汇聚协议(Packet Data Convergence Protocol，PDCP)层功能，或者包含RRC/PDCP以及部分无线链路层控制协议(Radio Link Control，RLC)层功能；或者包含RRC/PDCP/媒体介入控制(Media Access Control，MAC)层，甚至部分或者全部物理层PHY功能，也不排除其它任何可能性；
DU具有现有基站的全部或者部分协议层功能，即RRC/SDAP/PDCP/RLC/MAC/PHY的部分协议层功能单元，比如包含PDCP/RLC/MAC/PHY等协议层功能，或者包含RLC/MAC/PHY等协议层功能或者包含部分RLC/MAC/PHY功能，或者只包含全部或者部分PHY功能；需要注意的是这里提及的各个协议层的功能可能发生变化，均在本申请保护的范围内。
应理解，本申请实施例的技术方案可以应用于各种通信系统，例如：全球移动通讯(Global System of Mobile Communication，GSM)系统、码分多址(Code Division Multiple Access，CDMA)系统、宽带码分多址(Wideband Code Division Multiple Access，WCDMA)系统、长期演进(Long Term Evolution，LTE)系统、LTE频分双工(Frequency Division Duplex，FDD)系统、LTE时分双工(Time Division Duplex，TDD)、通用移动通信系统(Universal Mobile Telecommunication System，UMTS)、未来的第五代(5th-Generation，5G)通信系统以及CRAN等通信系统。
还应理解，本申请实施例的网络设备可以是用于与终端设备进行通信的设备，例如，可以是GSM系统或CDMA中的基站(Base Transceiver Station，BTS)与基站控制器(Base Station Controller，BSC)的结合，也可以是WCDMA系统中的基站(NodeB，NB)与无线网控制器(Radio Network Controller，RNC)，还可以是LTE系统中的演进型基站(Evolutional Node B，eNB或eNodeB)，或者该网络设备可以为中继站、接入点、车载设备、可穿戴设备以及未来5G网络中的接入网设备，比如下一代基站，或未来演进的公共陆地移动网络(Public Land Mobile Network，PLMN)网络中的接入网设备等。
具体地，第三代移动通信技术(3rd-Generation，3G)中的UMTS系统，存在无线网络控制节点和基站分离的场景；在LTE系统中，存在有基带模块和射频模块分离的情景，即射频拉远的场景；数据中心(Data Center，DC)场景，需要两个不同的网络之间互联；大小站场景，大小站相互连接存在接口；LTE与Wifi聚合(LTE-Wifi aggregation，LWA)场景；在5G系统中存在各种无小区(non-cell)场景(终端可以在各个小区之间自由随意切换，各个小区之间没有明确的界线)，存在一个控制节点和所有小区连接，或者在小区下面连接各个传输节点；CRAN场景，存在BBU切分的场景；CRAN虚拟化场景，BBU的某一部分功能集中部署，虚拟化，另外一部分功能分开部署，两个部分之间存在物理分开部署可能性；应理解，不同系统/制式共存场景都在本申请适用的范围内。
本申请结合终端设备描述了各个实施例。终端设备也可以指用户设备(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。接入终端可以是蜂窝电话、无绳电话、会话启动协议(Session Initiation Protocol，SIP)电话、无线本地 环路(Wireless Local Loop，WLL)站、个人数字处理(Personal Digital Assistant，PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备，未来5G网络中的终端设备或者PLMN中的终端设备等。
图6示出了根据本申请实施例的切换方法100的示意性流程图，该第一网络节点可以对应于图3中的CU，该第二网络节点可以对应于图3中的DU1，该第三网络节点可以对应于图3中的DU2；或者，该第一网络节点可以对应于图4中的CU，该第二网络节点可以对应于图4中的DU；或者，该第一网络节点可以对应于图5中的源控制节点(S-CU)，该第二网络节点可以对应于图5中的源数据单元(S-DU)，该第三网络节点可以对应于图5中的目标数据单元(T-DU)，如图6所示，该方法100包括：
S110，第一网络节点确定终端设备需要进行切换，该切换为从第二网络节点到第三网络节点的切换，或该切换为从该第二网络节点的第一小区到该第二网络节点的第二小区的切换，该第一网络节点包括分组数据汇聚协议层、业务数据适配层和无线资源控制功能中的至少一种，该第二网络节点和该第三网络节点包括无线链路层控制协议层、媒体介入控制层和物理层功能中的至少一种；
S120，当该切换为从该第二网络节点到该第三网络节点的切换时，该第一网络节点向该第三网络节点发送无线链路建立指示信息，该无线链路建立指示信息用于指示第三网络节点为该终端设备建立无线链路；
S130，当该切换为从该第二网络节点的第一小区到该第二网络节点的第二小区的切换时，该第一网络节点向第二网络节点发送无线链路更改指示信息，该无线链路更改指示信息用于指示该终端设备的服务小区从该第一小区切换至该第二小区；
S140，该第一网络节点向该终端设备发送切换命令，该切换命令用于指示该终端设备进行该切换。
具体而言，该第一网络节点包括分组数据汇聚协议层、业务数据适配层和无线资源控制功能中的至少一种，该第二网络节点和该第三网络节点包括无线链路层控制协议层、媒体介入控制层和物理层功能中的至少一种，当该第一网络节点确定该终端设备需要进行切换后，该第一网络节点向该终端设备发送切换命令，该切换命令用于指示该终端设备从该第二网络节点切换至该第三网络节点，或者从该第二网络节点的第一小区切换至该第二网络节点的第二小区。
例如，如图3所示，CU具备PDCP RRC功能，DU1和DU2具备RLC/MAC/PHY功能，DU1和DU2由CU管理，在CU接收到终端设备的第一消息后，确定该终端设备需要从CU控制下的DU1切换至CU控制下的DU2。
又例如，如图4所示，CU具备PDCP RRC功能，DU具备RLC/MAC/PHY功能，在CU接收到终端设备的第一消息后，确定该终端设备需要从DU控制下的第一小区切换至DU控制下的第二小区。
再例如，如图5所示，S-CU和T-CU具备PDCP RRC功能，S-DU和T-DU具备RLC/MAC/PHY功能，S-DU由S-CU管理，T-DU由T-CU管理，在CU接收到终端设备的第一消息后，确定该终端设备需要从S-CU控制下的S-DU切换至T-DU控制下的T-DU。
本申请实施例的切换方法，可以实现在网络设备部分功能分离为不同网络节点时，保证终端设备进行快速切换。
图7示出了根据本申请实施例的切换方法200的示意性流程图，该第一网络节点可以对应于图3中的CU，该第二网络节点可以对应于图3中的DU1，该第三网络节点可以对应于图3中的DU2，如图7所示，该方法200包括：
S210，第一网络节点确定终端设备需要进行切换，该切换为从第二网络节点到第三网络节点的切换，该第一网络节点包括分组数据汇聚协议层、业务数据适配层和无线资源控制功能中的至少一种，该第二网络节点和该第三网络节点包括无线链路层控制协议层、媒体介入控制层和物理层功能中的至少一种。例如，该第一网络节点可以具有分组数据汇聚协议层、业务数据适配层和无线资源控制功能，该第二网络节点和该第三网络节点可以分别具有无线链路层控制协议层、媒体介入控制层和物理层功能。
可选地，S210该第一网络节点确定该终端设备需要进行切换之前，该方法200还包括：
S201，该终端设备向该第一网络节点发送第一消息，该第一消息用于向第一网络节点请求对该终端设备进行切换。
应理解，该第一消息可以为测量报告(Measurement Report)，也可以为负载信息或者干扰信息，本申请并不限于此。
具体而言，该第一网络节点收到该第一消息后，根据该第一消息，确定终端设备需要进行从该第二网络节点到该第三网络节点的切换，该第一网络节点包括分组数据汇聚协议层、业务数据适配层和无线资源控制功能中的至少一种，该第二网络节点和该第三网络节点包括无线链路层控制协议层、媒体介入控制层和物理层功能中的至少一种。
可选地，该第二网络节点和该第三网络节点由该第一网络节点管理。
例如，图3中，DU1和DU2由CU管理，在CU接收到终端设备的第一消息后，确定该终端设备需要从CU控制下的DU1切换至CU控制下的DU2，其中，CU具备PDCP RRC功能，DU1和DU2具备RLC/MAC/PHY功能。
S220，当该切换为从该第二网络节点到该第三网络节点的切换时，该第一网络节点向该第三网络节点发送无线链路建立指示信息，该无线链路建立指示信息用于指示第三网络节点为该终端设备建立无线链路。
可选地，该无线链路建立指示信息用于指示第三网络节点为该终端设备建立无线链路，该无线链路为从第一网络节点到该第三网络节点的链路。
具体而言，当该第一网络节点确定该终端设备需要从该第二网络节点切换至该第三网络节点时，该第一网络节点向该第三网络节点发送无线链路建立指示信息，该无线链路建立指示信息用于指示第三网络节点为该终端设备建立无线链路，以使该第一网络节点和/或该终端设备在新的无线链路上传输数据。
具体的，该无线链路指示消息可以为该终端设备上下文建立请求消息，该第一网络节点发送该终端设备的上下文建立请求消息给该第三网络节点。该第三网络节点根据该终端设备的上下文建立请求消息为该终端设备建立无线链路。
例如，该终端设备的上下文建立请求中包括要为该终端设备建立的承载信息，小区信息等。该第三网络节点接收到该终端设备的上下文建立请求消息后完成对该终端设备的上下文建立，如承载的建立等，则意味着该无线链路建立成功。
可选地，该方法200还包括：
S221，当该切换为从该第二网络节点到该第三网络节点的切换时，该第一网络节点接收该第二网络节点发送的数据发送状态，该数据发送状态用于指示向该终端设备未发送成功的数据序列号。
具体而言，该第一网络节点确定终端设备从该第二网络节点切换至该第三网络节点时，存在数据转发的情况，例如，下行数据的传输从第一链路(第一网络节点-第二网络节点-终端设备)切换至第二链路(第一网络节点-第三网络节点-终端设备)时，可能会发生数据丢失的情况，此时需要第一网络节点对丢失的数据进行重传，具体而言，该第二网络节点向该第一网络节点发送数据发送状态，该数据发送状态用于指示向该终端设备未发送成功的数据序列号，该第一网络节点根据该数据发送状态，向该第三网络节点继续发送未发送成功的数据到终端设备。
又例如，对于上行数据，第一网络节点接收第二网络节点发送的数据，根据第二网络节点发送的数据确定上行数据发送状态。
例如，对于下行数据，该未发送成功的数据也为整个数据，也可以为整个数据的一部分或者一段，若该未发送成功的数据也为整个数据，则终端设备先向该第二网络节点发送第一数据状态报告，该第二网络节点可以将该第一数据状态报告翻译为数据发送状态，并将该数据发送状态告诉该第一网络设备。
又例如，若第一链路应经发生无线链路失败(Radio Link Failure，RLF)，该第二网络节点将最新的数据状态报告翻译为数据发送状态，并将该数据发送状态告诉该第一网络节点。
应理解，该第一网络节点可以识别该数据发送状态，确定发送成功的数据序列号，并将该未发送成功的数据发送给该第三网络节点，进而该第三网络节点将该未发送成功的数据发送给该终端设备。
还应理解，对于整个数据的一部分或者一段未发送成功的情况，该第二网络节点除了要向该第一网络节点发送数据发送状态以外，由于对于数据的分段在第二网络节点或第三网络节点完成，该第二网络节点还要向该第三网络节点发送该数据分段信息，该第三网络节点在接收到该分段信息后，可以对该第一网络节点发送的未发送成功的数据进行分段，进而将未发送成功的数据段发送给该终端设备。
应理解，对于上行数据，该第一网络节点根据第二网络节点发送的上行数据，确定该终端设备的上行数据发送状态，确定发送成功数据的序列号，并将未发送成功的数据序列号发送给该终端设备，以便于该终端设备在切换到第三网络节点后将未发送成功的数据继续发送给第一网络节点。
图8示出了在CU-DU架构下的一种数据转发的示意图，丢失的无线链路层控制协议协议数据单元(Lost RLC PDU)有两种形态，一种是Lost RLC PDU，还有一种是Lost RLC PDU segmentatation(数据段)。
对于Lost RLC PDU，UE将原有的RLC状态报告(RLC status report)发给第一链路(CU-DU1-UE)的RLC实体(DU1)，由第一链路的RLC实体翻译成PDCP状态报告，告诉PDCP实体(CU)。
第一链路的RLC实体将最新的RLC status report翻译成PDCP状态报告，告诉PDCP实体。
RLC实体只需告知PDCP实体已经收到的连续的RLC PDU的最后一个数据序列号(SN号)，或者丢失的第一个RLC PDU的SN号，或者在连续的RLC PDU中丢失的RLC PDU的SN号，以及收到的最后一个RLC PDU的SN号，这样可以通过PDCP/RLC的SN号的对应关系直接转换PDCP DU和RLC PDU，并向第二链路(CU-DU2-UE)发送需要重传的数据。
对于Lost RLC PDU segmentatation，第一链路的RLC实体除了需要向PDCP实体发送PDCP状态报告以外，还需要向第二链路的RLC实体(DU2)发送数据分段信息，DU2在收到该数据分段信息后，可以对PDCP实体发送的重传的数据进行分段，进而将该未发送成功的数据段发送给终端设备。
S230，该第一网络节点向该终端设备发送切换命令，该切换命令用于指示该终端设备进行该切换。
可选地，在终端设备接收到该切换命令之前，该方法200还包括：
S222，该终端设备建立第一链路和第二链路，该第一链路为从该第一网络节点到第二网络节点的链路，该第二链路为从该第一网络节点到该第三网络节点的链路。
可选地，该第一链路和该第二链路包括无线资源控制配置，该无线资源控制配置包括无线链路层控制协议层、媒体介入控制层和物理层中的至少一种。
具体而言，如图8所示，UE可以在收到该切换命令之前建立两套协议栈，一套激活(可以为上述第一链路)，另一套去激活(可以为上述第二链路)，当UE需要从激活链路切换至去激活链路时，快速切换到该去激活链路。这个时候去激活的链路的所有配置包括RLC/MAC/PHY已经在一开始配置好，当需要切换到去激活链路上时，需要先激活该去激活链路，UE对该去激活链路进行测量确认该去激活链路可行，然后直接传输用户面数据。
可选地，在S221该终端设备建立第一链路和第二链路后，该终端设备可以按照一定的周期测量和/或监听该第二链路，保证该第二条链路快速可用。
例如，如图8所示，该激活链路(UE-DU1-CU)发生RLF后需要切换到该去激活链路(UE-DU2-CU)时，UE可以根据测量结果确定该去激活链路直接可用，然后直接传输用户面数据。
作为一种实现方式，为了节省资源，该终端设备可以按照一定的周期测量和/或监听该第二链路可以是该终端设备设置一个定时器Timer1，在定时器超时前一直对该去激活链路进行测量和/或监听，当该Timer1超时时，可以调整测量和/或监听的周期，设定比当前的测量周期更长的测量和/或监听周期。
应理解，S221中该终端设备也可以建立一条链路，如上述第一链路，该第一链路为从该第一网络节点到第二网络节点的链路，该第一链路发生无线链路失败，该终端设备继续测量和/或监听该第一链路。
例如，如图8所示，当该终端设备在第一链路由于RLF或者其他原因断开之后，UE保存所有的配置，包括RLC/MAC/PHY的配置，而且UE在这条链路上一直在测量或者监听状态。在UE与DU1的无线链路恢复之后可以立即在此链路传输用户面数据。
作为一种实现方式，为了节省资源，该终端设备设置一个Timer2，当Timer2不超时的时候保留配置并保持测量或者监听状态；当Timer2超时后测量或者监听的周期延长。既节省资源又保持该终端设备一直在监听状态以便于快速切换。
可选地，在S230该第一网络节点向该终端设备发送切换命令之前，该方法还包括：
S223，该第一网络节点向该第三网络节点发送第一切换请求消息；
S224，该第一网络节点接收该第三网络节点发送的第一切换请求确认消息。
具体而言，在该第一网络节点确定该终端设备需要从该第二网络节点切换至该第三网络节点时，可以向该第三网络节点发送第一切换请求消息，该第一切换请求消息用于向该第三网络节点指示该终端设备需要从该第二网络节点切换至该第三网络节点，该第三网络节点收到该第一切换请求消息，向该第一网络节点发送第一切换请求确认消息。
可选地，该方法200还包括：
S231，该终端设备向该第一网络节点和该第三网络节点发送随机接入请求；
S232，该第一网络节点和该第三网络节点向该终端设备发送随机接入响应；
S233，该终端设备向该第一网络节点和该第三网络节点发送无线资源控制RRC建立完成消息；
S234，该第一网络节点向该第二网络节点发送第一指示信息，该第一指示信息用于指示该第二网络节点释放该终端设备的上下文信息。
本申请实施例的切换方法，可以实现在网络设备部分功能分离为不同网络节点时，保证终端设备进行快速切换。
图9示出了根据本申请实施例的切换方法300的示意性流程图，该第一网络节点可以对应于图4中的CU，该第二网络节点可以对应于图4中的DU，如图4所示，该方法300包括：
S310，第一网络节点确定终端设备需要进行切换，该切换为从该第二网络节点的第一小区到该第二网络节点的第二小区的切换，该第一网络节点包括分组数据汇聚协议层、业务数据适配层和无线资源控制功能中的至少一种，该第二网络节点包括无线链路层控制协议层、媒体介入控制层和物理层功能中的至少一种。
可选地，S310该第一网络节点确定该终端设备需要进行切换之前，该方法300还包括：
S301，该终端设备向该第一网络节点发送第一消息，该第一消息用于向第一网络节点请求对该终端设备进行切换。
应理解，该第一消息可以为测量报告，也可以为负载信息或者干扰信息，本申请并不限于此。
具体而言，该第一网络节点收到该第一消息后，根据该第一消息，确定该终端设备需要进行从该第二网络节点的第一小区到该第二网络节点的第二小区的切换，该第一网络节点包括分组数据汇聚协议层、业务数据适配层和无线资源控制功能中的至少一种，该第二网络节点包括无线链路层控制协议层、媒体介入控制层和物理层功能中的至少一种。
可选地，该第二网络节点由该第一网络节点管理。
S320，当该切换为从该第二网络节点的第一小区到该第二网络节点的第二小区的切换时，该第一网络节点向第二网络节点发送无线链路更改指示信息，该无线链路更改指示信息用于指示该终端设备的服务小区从该第一小区切换至该第二小区。
具体而言，该第一网络节点确定该终端设备需要进行从该第二网络节点的第一小区到该第二网络节点的第二小区的切换后，向该第二网络节点发送无线链路更改指示信息，该无线链路更改指示信息用于指示该第二网络节点将该终端设备的服务小区从该第一小区 切换至该第二小区。
该无线链路更新指示消息具体实现形式也可以为该终端设备的上下文修改请求消息，该终端设备的上下文修改请求消息中包括用于指示该终端设备的服务小区从该第一小区切换至该第二小区的信息。
应理解，由于RLC层在该第二网络节点，该第二网络节点掌握所有成功发送数据的信息，在该第二网络节点的小区间切换时无需进行数据转发。
S330，该第一网络节点向该终端设备发送切换命令，该切换命令用于指示该终端设备进行该切换。
可选地，在S330该第一网络节点向该终端设备发送切换命令之前，该方法还包括：
S321，该第一网络节点向该第二网络节点的第二小区发送第一切换请求消息；
S322，该第一网络节点接收该第二网络节点的第二小区发送的第一切换请求确认消息。
具体而言，在该第一网络节点确定该终端设备需要从该第二网络节点的第一小区切换至该第二网络节点的第二小区时，可以向该第二网络节点的第二小区发送第一切换请求消息，该第一切换请求消息用于向该第二网络节点的第二小区指示该终端设备需要从该第二网络节点的第一小区切换至该第二网络节点的第二小区，该第二网络节点的第二小区收到该第一切换请求消息，向该第一网络节点发送第一切换请求确认消息。
可选地，该方法300还包括：
S331，该终端设备向该第一网络节点和该第二小区发送随机接入请求；
S332，该第一网络节点和该第二小区向该终端设备发送随机接入响应；
S333，该终端设备向该第一网络节点和该第二小区发送无线资源控制RRC建立完成消息；
S334，该第一网络节点向该第一小区发送第二指示信息，该第二指示信息用于指示该第一小区释放该终端设备的上下文信息。
本申请实施例的切换方法，可以实现在网络设备部分功能分离为不同网络节点时，保证终端设备进行快速切换。
图10示出了根据本申请实施例的切换方法400的示意性流程图，该第一网络节点可以对应于图5中的源控制节点(S-CU)，该第二网络节点可以对应于图5中的源数据单元(S-DU)，该第三网络节点可以对应于图5中的目标数据单元(T-DU)，该第四网络节点可以对应于图5中的目标控制节点(S-CU)，如图10所示，该方法400包括：
S410，第一网络节点确定终端设备需要进行切换，该切换为从该第一网络节点控制下的第二网络节点到第四网络节点控制下的第三网络节点的切换，该第一网络节点和该第四网络节点包括分组数据汇聚协议层、业务数据适配层和无线资源控制功能中的至少一种，该第二网络节点和该第三网络节点包括无线链路层控制协议层、媒体介入控制层和物理层功能中的至少一种。
可选地，S410该第一网络节点确定该终端设备需要进行切换之前，该方法400还包括：
S401，该终端设备向该第一网络节点发送第一消息，该第一消息用于向第一网络节点请求对该终端设备进行切换。
应理解，该第一消息可以为测量报告，也可以为负载信息或者干扰信息，本申请并不限于此。
具体而言，该第一网络节点收到该第一消息后，根据该第一消息，确定该终端设备需要进行从该第一网络节点控制下的第二网络节点到该第四网络节点控制下的第三网络节点的切换，该第一网络节点和该第四网络节点包括分组数据汇聚协议层、业务数据适配层和无线资源控制功能中的至少一种，该第二网络节点和该第三网络节点包括无线链路层控制协议层、媒体介入控制层和物理层功能中的至少一种。
S420，当该切换为从该第二网络节点到该第三网络节点的切换时，该第一网络节点向该第三网络节点发送无线链路建立指示信息，该无线链路建立指示信息用于指示第三网络节点为该终端设备建立无线链路。
可选地，该无线链路建立指示信息用于指示第三网络节点为该终端设备建立无线链路，该无线链路为从第一网络节点到该第三网络节点的链路。
具体而言，当该第一网络节点确定该终端设备需要从该第二网络节点切换至该第三网络节点时，该第一网络节点向该第三网络节点发送无线链路建立指示信息，该无线链路建立指示信息用于指示第三网络节点为该终端设备建立无线链路，以使该第一网络节点和/或该终端设备在新的无线链路上传输数据。
可选地，该方法400还包括：
S421，该第一网络节点接收该第二网络节点发送的数据发送状态，该数据发送状态用于指示向该终端设备未发送成功的数据序列号；
S422，该第一网络节点向该第四网络节点发送数据发送状态。
具体而言，该第一网络节点确定终端设备从该第一网络节点控制下的第二网络节点切换到该第四网络节点控制下的第三网络节点时，存在数据转发的情况，即下行数据的传输从第一链路(第一网络节点-第二网络节点-终端设备)切换至第二链路(第四网络节点-第三网络节点-终端设备)时，可能会发生数据丢失的情况，此时需要第一网络节点对丢失的数据进行重传，该第二网络节点可以向第一网络节点发送自动重传请求(Automatic Repeat Request，ARQ)，具体而言，该第二网络节点向该第一网络节点发送数据发送状态，该数据发送状态用于指示向该终端设备未发送成功的数据序列号，该第一网络节点向该第四网络节点转发该数据发送状态，以便于该第四网络节点向该第三网络节点发送未发送成功的数据，该第四网络节点根据该数据发送状态，向该第三网络节点继续发送未发送成功的数据到终端设备。
又例如，对于上行数据，第一网络节点接收第二网络节点发送的数据，根据第二网络节点发送的数据确定上行数据发送状态。
例如，该未发送成功的数据也为整个数据，也可以为整个数据的一部分或者一段，若该未发送成功的数据也为整个数据，则终端设备先向该第二网络节点发送第一数据状态报告，该第二网络节点可以将该第一数据状态报告翻译为数据发送状态。
应理解，对于上行数据，该第一网络节点根据第二网络节点发送的上行数据，确定该终端设备的上行数据发送状态，确定发送成功数据的序列号，并将未发送成功的数据序列号发送给该终端设备，以便于该终端设备在切换到第三网络节点后将未发送成功的数据继续发送给第四网络节点。
又例如，若第一链路应经发生无线链路失败(Radio Link Failure，RLF)，该第二网络节点将最新的数据状态报告翻译为数据发送状态，并将该数据发送状态告诉该第一网络节点。
应理解，该第一网络节点可以识别该数据发送状态，确定发送成功的数据序列号，并将该未发送成功的数据发送给该第三网络节点，进而该第三网络节点将该未发送成功的数据发送给该终端设备。
还应理解，对于整个数据的一部分或者一段未发送成功的情况，该第二网络节点除了要向该第一网络节点发送数据发送状态以外，由于对于数据的分段在第二网络节点或第三网络节点完成，该第二网络节点还要向该第三网络节点发送该数据分段信息，该第三网络节点在接收到该分段信息后，可以对该第一网络节点发送的未发送成功的数据进行分段，进而将未发送成功的数据段发送给该终端设备。
图11示出了在CU-DU架构下的一种数据转发的示意图，丢失的无线链路层控制协议协议数据单元(Lost RLC PDU)有两种形态，一种是Lost RLC PDU，还有一种是Lost RLC PDU segmentatation(数据段)。
对于Lost RLC PDU，UE将原有的RLC状态报告(RLC status report)发给第一链路((S-CU)-(S-DU)-UE)的RLC实体(S-DU)，由第一链路的RLC实体翻译成PDCP状态报告，告诉第一链路的PDCP实体(S-CU)，S-CU将该PDCP状态报告转发给第二链路((T-CU)-(T-DU)-UE)的PDCP实体(T-CU)。
如果第一链路已经发生RLF，那么第一链路的RLC实体将最新的RLC status report翻译成PDCP状态报告，告诉PDCP实体。
S-CU或T-CU需要设法识别RLC status report：Lost RLC PDU，其SN号与PDCP SN号对应，所以S-DU只需告知S-CU已经收到的连续的RLC PDU的最后一个SN号，或者丢失的第一个RLC PDU的SN号，或者在连续的RLC PDU中丢失的RLC PDU的SN号，以及收到的最后一个RLC PDU的SN号，这样T-CU可以通过PDCP/RLC的SN号的对应关系直接转换PDCP DU和RLC PDU，并向T-DU发送需要重传的数据。
对于Lost RLC PDU segmentatation，S-DU除了需要向S-CU发送PDCP状态报告以外，还需要向T-DU发送数据分段信息，T-DU在收到该数据分段信息后，可以对T-CU发送的重传的数据进行分段，进而将该未发送成功的数据段发送给终端设备。
S430，该第一网络节点向该终端设备发送切换命令，该切换命令用于指示该终端设备进行该切换。
可选地，在终端设备接收到该切换命令之前，该方法200还包括：
S431，该终端设备建立第一链路和第二链路，该第一链路为从该第一网络节点到第二网络节点的链路，该第二链路为从该第四网络节点到该第三网络节点的链路。
可选地，该第一链路和该第二链路包括无线资源控制配置，该无线资源控制配置包括无线链路层控制协议层、媒体介入控制层和物理层中的至少一种。
具体而言，如图11所示，UE可以在收到该切换命令之前建立两套协议栈，一套激活(可以为上述第一链路)，另一套去激活(可以为上述第二链路)，当UE需要从激活链路切换至去激活链路时，快速切换到该去激活链路。这个时候去激活的链路的所有配置包括RLC/MAC/PHY已经在一开始配置好，当需要切换到去激活链路上时，需要先激活该去激 活链路，UE对该去激活链路进行测量确认该去激活链路可行，然后直接传输用户面数据。
可选地，在S431该终端设备建立第一链路和第二链路后，该终端设备可以按照一定的周期测量和/或监听该第二链路，保证该第二条链路快速可用。
例如，如图11所示，该激活链路((S-CU)-(S-DU)-UE)发生RLF后需要切换到该去激活链路((T-CU)-(T-DU)-UE)时，UE可以根据测量报告确定该去激活链路直接可用，然后直接传输用户面数据。
作为一种实现方式，为了节省资源，该终端设备可以按照一定的周期测量和/或监听该第二链路可以是该终端设备设置一个定时器Timer3，在定时器超时前一直对该去激活链路进行测量和/或监听，当该Timer3超时时，可以调整测量和/或监听的周期，设定比当前的测量周期更长的测量和/或监听周期。
应理解，S431中该终端设备也可以建立一条链路，如上述第一链路，该第一链路为从该第一网络节点到第二网络节点的链路，该第一链路发生无线链路失败，该终端设备继续测量和/或监听该第一链路。
例如，如图11所示，当该终端设备在第一链路由于RLF或者其他原因断开之后，UE保存所有的配置，包括RLC/MAC/PHY的配置，而且UE在这条链路上一直在测量或者监听状态。在UE与S-DU的无线链路恢复之后可以立即在此链路传输用户面数据。
作为一种实现方式，为了节省资源，该终端设备设置一个Timer4，当Timer4不超时的时候保留配置并保持测量或者监听状态；当Timer4超时后测量或者监听的周期延长。既节省资源又保持该终端设备一直在监听状态以便于快速切换。
可选地，在S440该第一网络节点向该终端设备发送切换命令之前，该方法还包括：
S432，该第一网络节点向该第四网络节点发送第三切换请求消息；
S433，该第一网络节点接收该第四网络节点发送的第三切换请求确认消息。
具体而言，在该第一网络节点确定该终端设备需要从该第一网络节点控制下的该第二网络节点切换至该第四网络节点控制下的该第三网络节点时，可以向该第四网络节点发送第三切换请求消息，该第三切换请求消息用于向该第四网络节点指示该终端设备需要从该第二网络节点切换至该第三网络节点，该第四网络节点收到该第三切换请求消息，向该第一网络节点发送第三切换请求确认消息。
可选地，该方法400还包括：
S441，该终端设备向该第三网络节点和该第四网络节点发送随机接入请求；
S442，该第三网络节点和该第四网络节点向该终端设备发送随机接入响应；
S443，该终端设备向该第三网络节点和该第四网络节点发送无线资源控制RRC建立完成消息；
S444，该第四网络节点向该第一网络节点发送第三指示信息，该第三指示信息用于指示该第二网络节点释放该终端设备的上下文信；
S445，该第一网络节点向该第四网络节点发送该第三指示信息。
本申请实施例的切换方法，可以实现CU-DU架构下CU间的切换，有助于保证终端设备在CU-DU架构下的正常通信。
可选地，该第四网络节点还需要向核心网节点请求切换，可以由以下步骤实现。
S451，该第四网络节点向核心网节点发送快速切换请求消息；
S452，该核心网节点进行快速切换承载管理；
S453，该核心网节点向该第四网络节点发送快速切换请求确认消息。
本申请实施例的切换方法，可以实现在网络设备部分功能分离为不同网络节点时，保证终端设备进行快速切换。
上文结合图6至图11，详细描述了根据本申请实施例的切换方法，下文结合图12至图21，详细描述根据本申请实施例的终端设备和网络设备。
图12示出了根据本申请实施例的网络设备500的示意性框图，如图12所示，该网络设备500包括：
处理模块510，用于确定终端设备需要进行切换，该切换为从第二网络节点到第三网络节点的切换，或该切换为从该第二网络节点的第一小区到该第二网络节点的第二小区的切换，该第一网络节点包括分组数据汇聚协议层、业务数据适配层和无线资源控制功能中的至少一种，该第二网络节点和该第三网络节点包括无线链路层控制协议层、媒体介入控制层和物理层功能中的至少一种；
收发模块520，用于当该切换为从该第二网络节点到该第三网络节点的切换时，该第一网络节点向该第三网络节点发送无线链路建立指示信息，该无线链路建立指示信息用于指示第三网络节点为该终端设备建立无线链路；
该收发模块520还用于当该切换为从该第二网络节点的第一小区到该第二网络节点的第二小区的切换时，该第一网络节点向第二网络节点发送无线链路更改指示信息，该无线链路更改指示信息用于指示该终端设备的服务小区从该第一小区切换至该第二小区；
该收发模块520还用于该第一网络节点向该终端设备发送切换命令，该切换命令用于指示该终端设备进行该切换。
可选地，该第二网络节点和该第三网络节点由该第一网络节点管理。
可选地，在该切换为从该第二网络节点到该第三网络节点的切换时，该收发模块520还用于接收该第二网络节点发送的数据发送状态，该数据发送状态用于指示向该终端设备未发送成功的数据序列号；该收发模块520还用于在该处理模块510的控制下，根据该数据发送状态，向该第三网络节点发送该未发送成功的数据。
可选地，该收发模块520还用于：
向该第三网络节点发送第一切换请求消息；
接收该第三网络节点发送的第一切换请求确认消息。
可选地，该收发模块520还用于：
接收该终端设备发送的随机接入请求；
向该终端设备发送随机接入响应；
接收该终端设备发送的无线资源控制建立完成消息；
向该第二网络节点发送指示信息，该指示信息用于指示该第二网络节点释放该终端设备的上下文信息。
可选地，该第二网络节点由该第一网络节点管理，该第三网络节点由第四网络节点管理，该第四网络节点包括分组数据汇聚协议层和无线资源控制功能。
可选地，该收发模块520还用于：
接收该第二网络节点发送的数据发送状态，该数据发送状态用于指示向该终端设备未 发送成功的数据；
向该第四网络节点发送该数据发送状态，以便于该第四网络节点向该第三网络节点发送该未发送成功的数据。
可选地，该收发模块520还用于：
向该第四网络节点发送第二切换请求消息；
接收该第四网络节点发送的第二切换请求确认消息。
可选地，该收发模块520还用于：
向该第二网络节点发送指示信息，该指示信息用于指示该第二网络节点释放该终端设备的上下文信息。
本申请实施例的网络设备，可以实现在网络设备部分功能分离为不同网络节点时，保证终端设备进行快速切换。
图13示出了根据本申请实施例的终端设备600的示意性框图，如图13所示，该终端设备600包括：
收发模块610，用于向第一网络节点发送第一消息，该第一消息用于向第一网络节点请求对该终端设备进行切换，该切换为从第二网络节点到第三网络节点的切换，或该切换为从该第二网络节点的第一小区到该第二网络节点的第二小区的切换，该第一网络节点包括分组数据汇聚协议层、业务数据适配层和无线资源控制功能中的至少一种，该第二网络节点和该第三网络节点包括无线链路层控制协议层、媒体介入控制层和物理层功能中的至少一种；
该收发模块610还用于接收该第一网络节点发送的切换命令，该切换命令用于指示该切换。
可选地，该第二网络节点和该第三网络节点由该第一网络节点管理。
可选地，该终端设备600还包括：处理器620，用于建立第一链路和第二链路，该第一链路为从该第一网络节点到第二网络节点的链路，该第二链路为从该第一网络节点到该第三网络节点的链路；
该处理器620还用于确定从该第一链路切换到该第二链路；
该收发模块610还用于在该第二链路上传输用户面数据。
可选地，该处理模块620还用于：该终端设备按照第一周期测量和/或监听该第二链路。
可选地，该处理模块620还用于：建立第一链路，该第一链路为从该第一网络节点到第二网络节点的链路；
该处理模块620还用于该第一链路发生无线链路失败时，继续测量和/或监听该第一链路；
该收发模块610在该第一链路恢复正常时，该终端设备在该第一链路上传输用户面数据。
可选地，该收发模块610还用于：向该第一网络节点和该第三网络节点发送随机接入请求；
接收该第一网络节点和该第三网络节点发送的随机接入响应；
向该第一网络节点和该第三网络节点发送无线资源控制建立完成消息。
可选地，该第二网络节点由该第一网络节点管理，该第三网络节点由第四网络节点管理，该第四网络节点包括分组数据汇聚协议层、业务数据适配层和无线资源控制功能中的至少一种。
可选地，该收发模块610还用于：向该第三网络节点和该第四网络节点发送随机接入请求；
接收该第三网络节点和该第四网络节点发送的随机接入响应；
向该第三网络节点和该第四网络节点发送无线资源控制建立完成消息。
本申请实施例的终端设备，可以实现在网络设备部分功能分离为不同网络节点时，保证终端设备进行快速切换。
图14示出了根据本申请实施例的网络设备700的示意性框图，如图14所示，该网络设备700包括：
收发模块710，用于接收第一网络节点发送的切换命令，该切换命令用于指示终端设备进行切换，该切换为从第二网络节点到第三网络节点的切换，或该切换为从该第二网络节点的第一小区到该第二网络节点的第二小区的切换，该第一网络节点包括分组数据汇聚协议层、业务数据适配层和无线资源控制功能中的至少一种，该第二网络节点和该第三网络节点包括无线链路层控制协议层、媒体介入控制层和物理层功能中的至少一种；
当该切换为从该第二网络节点的第一小区到该第二网络节点的第二小区的切换时，该收发模块710还用于接收第一网络节点发送无线链路更改指示信息，该无线链路更改指示信息用于指示该终端设备的服务小区从该第一小区切换至该第二小区；
处理模块720，用于根据该切换命令，释放该第二网络节点的上下文信息。
可选地，该第二网络节点和该第三网络节点由该第一网络节点管理。
可选到，该第二网络节点由该第一网络节点管理，该第三网络节点由第四网络节点管理，该第四网络节点包括分组数据汇聚协议层和无线资源控制功能。
可选地，该收发模块710还用于：
向该第一网络节点发送数据发送状态，该数据发送状态用于指示向该终端设备未发送成功的数据序列号；或
接收所述第一网络节点发送的小区更改指示信息，所述小区更改指示消息用于指示所述终端设备的服务小区从所述第一小区切换至所述第二小区。
可选地，该收发模块710还用于：
向该第三网络节点发送数据分段信息，该数据分段信息用于指示向该终端设备未发送成功的数据的分段信息。
本申请实施例的网络设备，可以实现在网络设备部分功能分离为不同网络节点时，保证终端设备进行快速切换。
图15示出了根据本申请实施例的网络设备800的示意性框图，如图15所示，该网络设备800包括：
收发模块810，用于接收第一网络节点发送的第一切换请求消息，该第一切换请求消息用于指示终端设备进行切换，该切换为从第二网络节点到第三网络节点的切换，或该切换为从该第二网络节点的第一小区到该第二网络节点的第二小区的切换，该第一网络节点包括分组数据汇聚协议层、业务数据适配层和无线资源控制功能中的至少一种，该第二网 络节点和该第三网络节点包括无线链路层控制协议层、媒体介入控制层和物理层功能中的至少一种；
当该切换为从该第二网络节点到该第三网络节点的切换时，该收发模块810还用于接收第一网络节点发送无线链路建立指示信息，该无线链路建立指示信息用于指示第三网络节点为该终端设备建立无线链路；
处理模块820，用于控制该收发模块810向该第一网络节点发送第一切换请求确认消息，该第一切换请求确认消息用于确认对该终端设备进行该切换。
可选地，该第二网络节点和该第三网络节点由该第一网络节点管理。
可选地，该第二网络节点由该第一网络节点管理，该第三网络节点由第四网络节点管理，该第四网络节点包括分组数据汇聚协议层和无线资源控制功能。
可选地，该收发模块810还用于接收该第二网络设备发送的数据分段信息，该数据分段信息用于指示向该终端设备未发送成功的数据段；
该处理模块820还用于根据该数据分段信息，向该终端设备发送未发送成功的数据段。
本申请实施例的网络设备，可以实现在网络设备部分功能分离为不同网络节点时，保证终端设备进行快速切换。
图16示出了根据本申请实施例的网络设备900的示意性框图，如图16所示，该网络设备900包括：
收发模块910，用于接收第一网络节点发送的第二切换请求消息，该第二切换请求消息用于指示终端设备进行切换，该切换为从第二网络节点到第三网络节点的切换，该第二网络节点由该第一网络节点管理，该第三网络节点由第四网络节点管理，该第一网络节点和该第四网络节点包括分组数据汇聚协议层、业务数据适配层和无线资源控制功能中的至少一种，该第二网络节点和该第三网络节点包括无线链路层控制协议层、媒体介入控制层和物理层功能中的至少一种；
当该切换为从该第二网络节点到该第三网络节点的切换时，该收发模块910还用于接收该第一网络节点发送的数据发送状态，该数据发送状态用于指示向该终端设备未发送成功的数据序列号；
处理模块920，用于控制该收发模块910向该第一网络节点发送第二切换请求确认消息，该第二切换请求确认消息用于确认对该终端设备进行该切换。
可选地，该处理器920还用于根据该数据发送状态，向该第三网络节点发送该未发送成功的数据。
可选地，该收发模块910还用于：接收该终端设备发送的随机接入请求；
向该终端设备发送随机接入响应；
接收该终端设备发送的无线资源控制建立完成消息；
向该第一网络节点发送指示信息，该指示信息用于指示该第二网络节点释放该终端设备的上下文信息。
可选地，该收发模块910还用于：向核心网节点发送第三切换请求消息；
接收核心网节点发送的第三切换请求确认消息。
本申请实施例的网络设备，可以实现在网络设备部分功能分离为不同网络节点时，保 证终端设备进行快速切换。
图17是根据本申请实施例的网络设备1000的结构示意图。如图17所示，该网络设备1000包括处理器1001、存储器1002、接收器1003和发送器1004。这些部件之间通信连接。该存储器1002用于存储指令，该处理器1001用于执行该存储器1002存储的指令，并控制该接收器1003接收信息以及控制该发送器1004发送信息。
其中，该处理器1001用于执行该存储器1002存储的指令，该处理器1001可以用于执行网络设备500中处理模块510相应的操作和/或功能，该接收器1003和发送器1004可以用于执行网络设备500中收发模块520相应的操作和/或功能，为了简洁，此处不再赘述。
图18是根据本申请实施例的终端设备1100的结构示意图。如图18所示，该终端设备1100包括处理器1101、存储器1102、接收器1103和发送器1104。这些部件之间通信连接。该存储器1102用于存储指令，该处理器1101用于执行该存储器1102存储的指令，并控制该接收器1103接收信息以及控制该发送器1104发送信息。
其中，该处理器1101用于执行该存储器1102存储的指令，该处理器1101可以用于执行终端设备600中处理模块620相应的操作和/或功能，该接收器1103和发送器1104可以用于执行终端设备600中收发模块610相应的操作和/或功能，为了简洁，此处不再赘述。
图19是根据本申请实施例的网络设备1200的结构示意图。如图19所示，该网络设备1200包括处理器1201、存储器1202、接收器1203和发送器1204。这些部件之间通信连接。该存储器1202用于存储指令，该处理器1201用于执行该存储器1202存储的指令，并控制该接收器1203接收信息以及控制该发送器1204发送信息。
其中，该处理器1201用于执行该存储器1202存储的指令，该处理器1201可以用于执行网络设备700中处理模块720相应的操作和/或功能，该接收器1203和发送器1204可以用于执行网络设备700中收发模块710相应的操作和/或功能，为了简洁，此处不再赘述。
图20是根据本申请实施例的网络设备1300的结构示意图。如图20所示，该网络设备1300包括处理器1301、存储器1302、接收器1303和发送器1304。这些部件之间通信连接。该存储器1302用于存储指令，该处理器1301用于执行该存储器1302存储的指令，并控制该接收器1303接收信息以及控制该发送器1304发送信息。
其中，该处理器1301用于执行该存储器1302存储的指令，该处理器1301可以用于执行网络设备800中处理模块820相应的操作和/或功能，该接收器1303和发送器1304可以用于执行网络设备800中收发模块810相应的操作和/或功能，为了简洁，此处不再赘述。
图21是根据本申请实施例的网络设备1400的结构示意图。如图21所示，该网络设备1400包括处理器1401、存储器1402、接收器1403和发送器1404。这些部件之间通信连接。该存储器1402用于存储指令，该处理器1401用于执行该存储器1402存储的指令，并控制该接收器1403接收信息以及控制该发送器1404发送信息。
其中，该处理器1401用于执行该存储器1402存储的指令，该处理器1401可以用于执行网络设备900中处理模块920相应的操作和/或功能，该接收器1403和发送器1404 可以用于执行网络设备900中收发模块910相应的操作和/或功能，为了简洁，此处不再赘述。
本申请实施例还提供了一种系统芯片，该系统芯片包括输入输出接口、至少一个处理器、至少一个存储器和总线，该至少一个存储器用于存储指令，该至少一个处理器用于调用该至少一个存储器的指令，以进行上述各个方面的方法的操作。
本申请还提供了如下相关的实施例(需要说明的是，如下实施例未使用本申请说明书前文所使用的编号方式)：
实施例1、一种切换方法，包括：第一网络节点获知终端设备需要进行切换，该切换为从第二网络节点到第三网络节点的切换，或该切换为从该第二网络节点的第一小区到该第二网络节点的第二小区的切换，该第一网络节点包括分组数据汇聚协议层、业务数据适配层和无线资源控制功能中的至少一种，该第二网络节点和该第三网络节点包括无线链路层控制协议层、媒体介入控制层和物理层功能中的至少一种；当该切换为从该第二网络节点到该第三网络节点的切换时，该第一网络节点向该第三网络节点发送无线链路建立指示信息，该无线链路建立指示信息用于指示该第三网络节点为该终端设备建立无线链路；当该切换为从该第二网络节点的第一小区到该第二网络节点的第二小区的切换时，该第一网络节点向该第二网络节点发送无线链路更改指示信息，该无线链路更改指示信息用于指示该终端设备的服务小区从该第一小区切换至该第二小区；该第一网络节点向该终端设备发送切换命令，该切换命令用于指示该终端设备进行该切换。
实施例2、根据实施例1所述的方法，该第二网络节点和该第三网络节点由该第一网络节点管理。
实施例3、根据实施例2所述的方法，在该切换为从该第二网络节点到该第三网络节点的切换时，该方法还包括：该第一网络节点接收该第二网络节点发送的数据发送状态，该数据发送状态用于指示向该终端设备未发送成功的数据序列号；该第一网络节点根据该数据发送状态，向该第三网络节点发送该未发送成功的数据。
实施例4、根据实施例3所述的方法，在该第一网络节点向该终端设备发送切换命令之前，该方法还包括：该第一网络节点向该第三网络节点发送第一切换请求消息；该第一网络节点接收该第三网络节点发送的第一切换请求确认消息。
实施例5、根据实施例3或4所述的方法，在该第一网络节点向该终端设备发送切换命令之后，该方法还包括：该第一网络节点接收该终端设备发送的随机接入请求；该第一网络节点向该终端设备发送随机接入响应；该第一网络节点接收该终端设备发送的无线资源控制建立完成消息；该第一网络节点向该第二网络节点发送指示信息，该指示信息用于指示该第二网络节点释放该终端设备的上下文信息。
实施例6、根据实施例1所述的方法，该第二网络节点由该第一网络节点管理，该第三网络节点由第四网络节点管理，该第四网络节点包括分组数据汇聚协议层和无线资源控制功能。
实施例7、根据实施例6所述的方法，在该切换为从该第二网络节点到该第三网络节点的切换时，该方法还包括：该第一网络节点向该第四网络节点发送数据发送状态，以便于该第四网络节点向该第三网络节点发送该未发送成功的数据，该数据发送状态用于指示向该终端设备未发送成功的数据序列号。
实施例8、根据实施例6或7所述的方法，在该第一网络节点向该终端设备发送切换命令之前，该方法还包括：该第一网络节点向该第四网络节点发送第二切换请求消息；该第一网络节点接收该第四网络节点发送的第二切换请求确认消息。
实施例9、根据实施例7或8所述的方法，在该第一网络节点向该终端设备发送切换命令之后，该方法还包括：该第一网络节点向该第二网络节点发送指示信息，该指示信息用于指示该第二网络节点释放该终端设备的上下文信息。
实施例10、一种网络设备，包括：存储器，用于存储指令；处理器，用于调用该存储器中的指令，以进行根据实施例1-9中任一项所述的方法的操作。
实施例11、一种切换方法，包括：终端设备向第一网络节点发送第一消息，该第一消息用于向第一网络节点请求对该终端设备进行切换，该切换为从第二网络节点到第三网络节点的切换，或该切换为从该第二网络节点的第一小区到该第二网络节点的第二小区的切换，该第一网络节点包括分组数据汇聚协议层、业务数据适配层和无线资源控制功能中的至少一种，该第二网络节点和该第三网络节点包括无线链路层控制协议层、媒体介入控制层和物理层功能中的至少一种；该终端设备接收该第一网络节点发送的切换命令，该切换命令用于指示该切换。
实施例12、根据实施例11所述的方法，该第二网络节点和该第三网络节点由该第一网络节点管理。
实施例13、根据实施例12所述的方法，在该切换为从该第二网络节点到该第三网络节点的切换时，该终端设备接收该第一网络节点发送的切换命令之前，该方法还包括：该终端设备建立第一链路和第二链路，该第一链路为从该第一网络节点到第二网络节点的链路，该第二链路为从该第一网络节点到该第三网络节点的链路；该终端设备确定从该第一链路切换到该第二链路；该终端设备在该第二链路上传输数据。
实施例14、根据实施例13所述的方法，在该终端设备从该第一链路切换到该第二链路之前，该方法还包括：该终端设备按照第一周期测量和/或监听该第二链路。
实施例15、根据实施例14所述的方法，在该切换为从该第二网络节点到该第三网络节点的切换时，该终端设备接收该第一网络节点发送的切换命令之前，该方法还包括：该终端设备建立第一链路，该第一链路为从该第一网络节点到第二网络节点的链路；该第一链路发生无线链路失败，该终端设备继续测量和/或监听该第一链路；在该第一链路恢复正常时，该终端设备在该第一链路上传输数据。
实施例16、根据实施例13至15中任一项所述的方法，该终端设备接收该第一网络节点发送的切换命令之后，该方法还包括：该终端设备向该第一网络节点和该第三网络节点发送随机接入请求；该终端设备接收该第一网络节点和该第三网络节点发送的随机接入响应；该终端设备向该第一网络节点和该第三网络节点发送无线资源控制建立完成消息。
实施例17、根据实施例11所述的方法，该第二网络节点由该第一网络节点管理，该第三网络节点由第四网络节点管理，该第四网络节点包括分组数据汇聚协议层、业务数据适配层和无线资源控制功能中的至少一种。
实施例18、根据实施例17所述的方法，在该切换为从该第二网络节点到该第三网络节点的切换时，该方法还包括：该终端设备向该第三网络节点和该第四网络节点发送随机接入请求；该终端设备接收该第三网络节点和该第四网络节点发送的随机接入响应；该终 端设备向该第三网络节点和该第四网络节点发送无线资源控制建立完成消息。
实施例19、一种终端设备，包括：存储器，用于存储指令；处理器，用于调用该存储器中的指令，以进行根据实施例11-18中任一项所述的方法的操作。
实施例20、一种切换方法，包括：第二网络节点接收第一网络节点发送的切换命令，该切换命令用于指示终端设备进行切换，该切换为从第二网络节点到第三网络节点的切换，或该切换为从该第二网络节点的第一小区到该第二网络节点的第二小区的切换，该第一网络节点包括分组数据汇聚协议层、业务数据适配层和无线资源控制功能中的至少一种，该第二网络节点和该第三网络节点包括无线链路层控制协议层、媒体介入控制层和物理层功能中的至少一种；当该切换为从该第二网络节点的第一小区到该第二网络节点的第二小区的切换时，该第二网络节点接收该第一网络节点发送无线链路更改指示信息，该无线链路更改指示信息用于指示该终端设备的服务小区从该第一小区切换至该第二小区；该第二网络节点根据该切换命令，释放该第二网络节点的上下文信息。
实施例21、根据实施例20所述的方法，该第二网络节点和该第三网络节点由该第一网络节点管理。
实施例22、根据实施例20所述的方法，该第二网络节点由该第一网络节点管理，该第三网络节点由第四网络节点管理，该第四网络节点包括分组数据汇聚协议层和无线资源控制功能。
实施例23、根据实施例21或22所述的方法，在该切换为从第二网络节点到第三网络节点的切换时，该方法还包括：该第二网络节点向该第一网络节点发送数据发送状态，该数据发送状态用于指示向该终端设备未发送成功的数据序列号；或，在该切换为从第二网络节点的第一小区到第二网络节点的第二小区的切换时，该方法还包括：该第二网络节点接收该第一网络节点发送的小区更改指示信息，该小区更改指示消息用于指示该终端设备的服务小区从该第一小区切换至该第二小区。
实施例24、一种网络设备，包括：存储器，用于存储指令；处理器，用于调用该存储器中的指令，以进行根据实施例20-23中任一项所述的方法的操作。
实施例25、一种切换方法，包括：第三网络节点接收第一网络节点发送的第一切换请求消息，该第一切换请求消息用于指示终端设备进行切换，该切换为从第二网络节点到第三网络节点的切换，或该切换为从该第二网络节点的第一小区到该第二网络节点的第二小区的切换，该第一网络节点包括分组数据汇聚协议层、业务数据适配层和无线资源控制功能中的至少一种，该第二网络节点和该第三网络节点包括无线链路层控制协议层、媒体介入控制层和物理层功能中的至少一种；当该切换为从该第二网络节点到该第三网络节点的切换时，该第三网络节点接收该第一网络节点发送的无线链路建立指示信息，该无线链路建立指示信息用于指示该第三网络节点为该终端设备建立无线链路；该第三网络节点向该第一网络节点发送第一切换请求确认消息，该第一切换请求确认消息用于确认对该终端设备进行该切换。
实施例26、根据实施例25所述的方法，该第二网络节点和该第三网络节点由该第一网络节点管理。
实施例27、一种网络设备，包括：存储器，用于存储指令；处理器，用于调用该存储器中的指令，以进行根据实施例25或26所述的方法的操作。
实施例28、一种切换方法，包括：第四网络节点接收第一网络节点发送的第二切换请求消息，该第二切换请求消息用于指示终端设备进行切换，该切换为从第二网络节点到第三网络节点的切换，该第二网络节点由该第一网络节点管理，该第三网络节点由第四网络节点管理，该第一网络节点和该第四网络节点包括分组数据汇聚协议层、业务数据适配层和无线资源控制功能中的至少一种，该第二网络节点和该第三网络节点包括无线链路层控制协议层、媒体介入控制层和物理层功能中的至少一种；当该切换为从该第二网络节点到该第三网络节点的切换时，该第四网络节点接收该第一网络节点发送的数据发送状态，该数据发送状态用于指示向该终端设备未发送成功的数据序列号；该第四网络节点向该第一网络节点发送第二切换请求确认消息，该第二切换请求确认消息用于确认对该终端设备进行该切换。
实施例29、根据实施例28所述的方法，该方法还包括：该第四网络节点根据该数据发送状态，向该第三网络节点发送该未发送成功的数据。
实施例30、一种网络设备，包括：存储器，用于存储指令；处理器，用于调用该存储器中的指令，以进行根据实施例28或29所述的方法的操作。
关于本申请以上实施例中所涉及的术语“至少一种”的含义，以“如下项目中至少一种：A，B，以及C”的表述为例，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，以此类推。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，当该表达为“项目包括如下中至少一种：A，B，……，以及X”时，即该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。
在本申请中可能出现的对各种消息/信息/设备/网元/系统/装置/动作/操作/流程/概念等各类客体进行了赋名，可以理解的是，这些具体的名称并不构成对相关客体的限定，所赋名称可随着场景，语境或者使用习惯等因素而变更，对本申请中技术术语的技术含义的理解，应主要从其在技术方案中所体现/执行的功能和技术效果来确定。
在本申请实施例中，应注意，本申请实施例上述的方法实施例可以应用于处理器中，或者由处理器实现。处理器可能是一种集成电路芯片，具有信号的处理能力。在实现过程中，上述方法实施例的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器可以是通用处理器、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。可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。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。
可以理解，本申请实施例中的存储器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。
应理解，说明书通篇中提到的“一个实施例”或“一实施例”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，在整个说明书各处出现的“在一个实施例中”或“在一实施例中”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，在本申请的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
另外，本文中术语“系统”和“网络”在本文中常被可互换使用。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。
应理解，在本申请实施例中，“与A相应的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。
可以理解的是，本申请上述实施例可通过提供一种网络设备，以实现前述第一网络节点，第二网络节点，第三网络节点或第四网络节点的功能，该网络设备包括：用于执行前述实施例任一方法中由第一网络节点，第二网络节点，第三网络节点或第四网络节点所执行的每一方法或动作的单元。该网络设备包括的单元可以通过软件和/或硬件方式实现。可以理解，本申请实施例中任一方法及其设计中，需要网络设备所执行的每一个方法或操作或步骤或动作，都可以有相应的软件或者硬件，或者软硬件结合的单元模块来实现，这些单元模块作为本申请所提出的无线接入网设备的组成部分。
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可以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程序指令时，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(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、磁盘)、光介质(例如，DVD)、或者半导体介质(例如固态硬盘Solid State Disk(SSD))等。
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、随机存取存储器、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所述以权利要求的保护范围为准。

Claims (26)

  1. 一种切换方法，其特征在于，包括：
    第一网络节点确定终端设备需要进行切换，所述切换为从第二网络节点向第三网络节点切换；
    所述第一网络节点向所述第三网络节点发送终端设备上下文建立请求消息，所述终端设备上下文建立请求消息用于指示所述第三网络节点为所述终端设备建立无线链路；
    所述第一网络节点向所述终端设备发送切换命令，所述切换命令用于指示所述终端设备进行所述切换；
    所述第一网络节点包括：分组数据汇聚协议层、业务数据适配层和无线资源控制功能这三者中的任意一种或任意两种或者全部；
    所述第二网络节点包括：无线链路层控制协议层、媒体介入控制层和物理层功能这三者中的任意一种或任意两种或全部；
    所述第三网络节点包括：无线链路层控制协议层、媒体介入控制层和物理层功能这三者中的任意一种或任意两种或全部。
  2. 根据权利要求1所述的方法，其特征在于，所述第一网络节点管理所述第二网络节点和所述第三网络节点。
  3. 根据权利要求1或2所述的方法，其特征在于，所述方法还包括：
    所述第一网络节点接收所述第二网络节点发送的数据发送状态，所述数据发送状态用于指示向所述终端设备未发送成功的数据序列号；
    所述第一网络节点根据所述数据发送状态，向所述第三网络节点发送所述未发送成功的数据。
  4. 根据权利要求1或2所述的方法，其特征在于，所述方法还包括：
    所述第一网络节点接收所述第二网络节点发送的数据发送状态，所述数据发送状态用于指示向所述终端设备未发送成功的数据；
    所述第一网络节点根据所述数据发送状态，向所述第三网络节点发送所述未发送成功的数据。
  5. 根据权利要求3或4所述的方法，其特征在于，所述方法还包括：
    所述第一网络节点向所述第三网络节点发送第一切换请求消息；
    所述第一网络节点接收所述第三网络节点发送的第一切换请求确认消息。
  6. 根据权利要求4或5所述的方法，其特征在于，所述方法还包括：
    所述第一网络节点接收所述终端设备发送的随机接入请求；
    所述第一网络节点向所述终端设备发送随机接入响应；
    所述第一网络节点接收所述终端设备发送的无线资源控制建立完成消息；
    所述第一网络节点向所述第二网络节点发送指示信息，所述指示信息用于指示所述第二网络节点释放所述终端设备的上下文信息。
  7. 根据权利要求1所述的方法，其特征在于，所述第二网络节点由所述第一网络节点管理，所述第三网络节点由第四网络节点管理，所述第四网络节点包括分组数据汇聚协议层和无线资源控制功能。
  8. 根据权利要求7所述的方法，其特征在于，所述方法还包括：
    所述第一网络节点向所述第四网络节点发送数据发送状态，以便于所述第四网络节点向所述第三网络节点发送所述未发送成功的数据，所述数据发送状态用于指示向所述终端设备未发送成功的数据序列号。
  9. 根据权利要求7或8所述的方法，其特征在于，所述方法还包括：
    所述第一网络节点向所述第四网络节点发送第二切换请求消息；
    所述第一网络节点接收所述第四网络节点发送的第二切换请求确认消息。
  10. 根据权利要求8或9所述的方法，其特征在于，所述方法还包括：
    所述第一网络节点向所述第二网络节点发送指示信息，所述指示信息用于指示所述第二网络节点释放所述终端设备的上下文信息。
  11. 一种切换方法，应用于从第二网络节点向第三网络节点切换终端设备的过程，其特征在于，包括：
    所述第二网络节点向第一网络节点发送数据发送状态，所述数据发送状态用于指示向终端设备未发送成功的数据序列号，以通知所述第一网络节点根据所述数据发送状态，向所述第三网络节点发送所述未发送成功的数据；
    所述第一网络节点包括：分组数据汇聚协议层、业务数据适配层和无线资源控制功能这三者中的任意一种或任意两种或者全部；
    所述第二网络节点包括：无线链路层控制协议层、媒体介入控制层和物理层功能这三者中的任意一种或任意两种或全部；
    所述第三网络节点包括：无线链路层控制协议层、媒体介入控制层和物理层功能这三者中的任意一种或任意两种或全部。
  12. 一种切换方法，应用于从第二网络节点向第三网络节点切换终端设备的过程，其特征在于，包括：
    所述第二网络节点向第一网络节点发送数据发送状态，所述数据发送状态用于指示向终端设备未发送成功的数据，以通知所述第一网络节点根据所述数据发送状态，向所述第三网络节点发送所述未发送成功的数据；
    所述第一网络节点包括：分组数据汇聚协议层、业务数据适配层和无线资源控制功能这三者中的任意一种或任意两种或者全部；
    所述第二网络节点包括：无线链路层控制协议层、媒体介入控制层和物理层功能这三者中的任意一种或任意两种或全部；
    所述第三网络节点包括：无线链路层控制协议层、媒体介入控制层和物理层功能这三者中的任意一种或任意两种或全部。
  13. 根据权利要求11或12所述的方法，其特征在于，包括：
    所述第二网络节点和所述第三网络节点由所述第一网络节点管理。
  14. 根据权利要求11-13中任一所述的方法，其特征在于，所述方法还包括：
    所述第二网络节点接收来自于所述第一网络节点的指示信息，所述指示信息用于指示所述第二网络节点释放所述终端设备的上下文信息。
  15. 根据权利要求11或12所述的方法，其特征在于，所述第二网络节点由所述第一网络节点管理，所述第三网络节点由第四网络节点管理，所述第四网络节点包括分组数据 汇聚协议层和无线资源控制功能。
  16. 一种切换方法，应用于终端设备从第二网络节点向第三网络节点切换的过程，其特征在于，包括：
    所述第三网络节点接收来自于第一网络节点发送的终端设备上下文建立请求消息，所述终端设备上下文建立请求消息用于指示所述第三网络节点为所述终端设备建立无线链路；
    所述第一网络节点包括：分组数据汇聚协议层、业务数据适配层和无线资源控制功能这三者中的任意一种或任意两种或者全部；
    所述第二网络节点包括：无线链路层控制协议层、媒体介入控制层和物理层功能这三者中的任意一种或任意两种或全部；
    所述第三网络节点包括：无线链路层控制协议层、媒体介入控制层和物理层功能这三者中的任意一种或任意两种或全部。
  17. 根据权利要求16所述的方法，其特征在于，所述第三网络节点和所述第二网络节点由所述第一网络节点管理。
  18. 根据权利要求16或17所述的方法，其特征在于，所述方法还包括：
    所述第三网络节点接收来自于所述第一网络节点发送的数据，所述数据由所述第一网络节点根据来自于所述第二网络节点的数据发送状态确定，所述数据发送状态用于指示向所述终端设备未发送成功的数据序列号。
  19. 根据权利要求16或17所述的方法，其特征在于，所述方法还包括：
    所述第三网络节点接收来自于所述第一网络节点发送的数据，所述数据由所述第一网络节点根据来自于第二网络节点的数据发送状态确定，所述数据发送状态用于指示向所述终端设备未发送成功的数据。
  20. 根据权利要求18或19所述的方法，其特征在于，所述方法还包括：
    所述第三网络节点接收来自于所述第一网络节点发送的第一切换请求消息；
    所述第三网络节点向所述第一网络节点发送第一切换请求确认消息。
  21. 根据权利要求16所述的方法，其特征在于，所述第二网络节点由所述第一网络节点管理，所述第三网络节点由第四网络节点管理，所述第四网络节点包括分组数据汇聚协议层和无线资源控制功能。
  22. 根据权利要求21所述的方法，其特征在于，所述方法还包括：
    所述第三网络节点接收来自于所述第四网络节点的数据，所述数据由所述第四网络节点根据来自于所述第一网络节点的数据发送状态确定，所述数据发送状态用于指示向所述终端设备未发送成功的数据序列号。
  23. 一种网络设备，其特征在于，包括：存储器和处理器，所述存储器用于存储指令；，所述处理器，用于执行所述存储器中的指令，实现根据权利要求1-22所述的方法中在如下任一种设备的功能：第一网络节点，第二网络节点，以及第三网络节点。
  24. 一种计算机程序存储介质，其特征在于，所述计算机程序存储介质具有程序指令，当所述程序指令被直接或者间接执行时，实现根据权利要求1-22中任一所述的方法中在如下任一种设备的功能：第一网络节点，第二网络节点，以及第三网络节点。
  25. 一种芯片系统，其特征在于，所述芯片系统包括至少一个处理器，当程序指令在 所述至少一个处理器中执行时，实现根据权利要求1-22中任一所述的方法中在如下任一种设备的功能：第一网络节点，第二网络节点，以及第三网络节点。
  26. 一种通信系统，其特征在于，所述通信系统包括：根据权利要求23所述的网络设备，或，根据权利要求24所述的计算机程序存储介质，或，根据权利要求25所述的芯片系统。
PCT/CN2018/085743 2017-05-05 2018-05-05 一种切换的方法、终端设备及网络设备 WO2018202187A1 (zh)

Priority Applications (7)

Application Number Priority Date Filing Date Title
BR112019023221-4A BR112019023221A2 (pt) 2017-05-05 2018-05-05 Método de transferência, aparelho, sistema, meio de armazenamento de programa de computador e sistema de chip
JP2019560759A JP6920468B2 (ja) 2017-05-05 2018-05-05 ハンドオーバ方法、端末デバイス及びネットワークデバイス
CA3062360A CA3062360C (en) 2017-05-05 2018-05-05 Handover method, apparatus, system, computer program storage medium and chip system
EP18794486.3A EP3621350B1 (en) 2017-05-05 2018-05-05 Handover method and system
RU2019139385A RU2763519C2 (ru) 2017-05-05 2018-05-05 Способ передачи обслуживания, терминальное устройство и сетевое устройство
KR1020197035995A KR102276720B1 (ko) 2017-05-05 2018-05-05 핸드오버 방법, 단말 디바이스 및 네트워크 디바이스
US16/673,497 US11265769B2 (en) 2017-05-05 2019-11-04 Handover method, terminal device, and network device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201710313955.6 2017-05-05
CN201710313955.6A CN109246770B (zh) 2017-05-05 2017-05-05 一种切换的方法、终端设备及网络设备

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US16/673,497 Continuation US11265769B2 (en) 2017-05-05 2019-11-04 Handover method, terminal device, and network device

Publications (1)

Publication Number Publication Date
WO2018202187A1 true WO2018202187A1 (zh) 2018-11-08

Family

ID=64016827

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2018/085743 WO2018202187A1 (zh) 2017-05-05 2018-05-05 一种切换的方法、终端设备及网络设备

Country Status (9)

Country Link
US (1) US11265769B2 (zh)
EP (1) EP3621350B1 (zh)
JP (1) JP6920468B2 (zh)
KR (1) KR102276720B1 (zh)
CN (1) CN109246770B (zh)
BR (1) BR112019023221A2 (zh)
CA (1) CA3062360C (zh)
RU (1) RU2763519C2 (zh)
WO (1) WO2018202187A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11582659B2 (en) 2019-01-31 2023-02-14 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Network device handover method and terminal device

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109803315B (zh) * 2017-11-17 2022-08-19 中兴通讯股份有限公司 数据传输方法及装置
CN111654887B (zh) * 2019-03-04 2023-03-31 中国移动通信有限公司研究院 切换方法、装置、相关设备及存储介质
EP3949681A1 (en) * 2019-03-28 2022-02-09 Telefonaktiebolaget LM Ericsson (publ) Iab node release procedure
US11032735B2 (en) * 2019-08-08 2021-06-08 At&T Intellectual Property I, L.P. Management of overload condition for 5G or other next generation wireless network
EP4035495A4 (en) * 2019-09-27 2023-06-21 Nokia Technologies Oy DEVICE, METHOD, APPARATUS AND COMPUTER READABLE MEDIUM FOR TRANSFER BETWEEN MASTER NODES
WO2021159371A1 (zh) * 2020-02-13 2021-08-19 Oppo广东移动通信有限公司 一种切换处理方法、终端设备
CN113498125B (zh) * 2020-03-20 2024-09-17 华为技术有限公司 一种通信方法、接入网设备、终端设备和核心网设备
CN114071600B (zh) * 2020-08-04 2023-09-05 大唐移动通信设备有限公司 基于mbms业务的切换方法、装置及处理器可读存储介质
EP4349068A1 (en) * 2021-06-03 2024-04-10 Nokia Solutions and Networks Oy Radio access network data transfer for user equipment mobility
WO2023010367A1 (zh) * 2021-08-04 2023-02-09 富士通株式会社 终端设备的转移方法、装置和系统
WO2024185748A1 (ja) * 2023-03-07 2024-09-12 三菱電機株式会社 通信システムおよび基地局

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101415211A (zh) * 2007-10-16 2009-04-22 华为技术有限公司 一种切换处理方法、系统和装置
US20110261683A1 (en) * 2010-04-26 2011-10-27 Fujitsu Limited Communications system, carrier-side communication apparatus, base station apparatus, and communication method therefor
CN106162730A (zh) * 2016-07-12 2016-11-23 上海华为技术有限公司 一种通信的方法、设备及系统

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1940095B1 (en) * 2002-04-05 2016-05-25 Intel Corporation System for efficient recovery of node b buffered data following serving high speed downlink shared channel cell change
CN100369522C (zh) * 2004-02-26 2008-02-13 大唐移动通信设备有限公司 实现同一基站内不同小区间用户切换的方法
WO2007052916A1 (en) * 2005-10-31 2007-05-10 Lg Electronics Inc. Method for processing control information in a wireless mobile communication system
RU2411660C2 (ru) * 2005-10-31 2011-02-10 Эл Джи Электроникс Инк. Способ передачи и приема информации о радиодоступе в системе беспроводной подвижной связи
GB2449629A (en) * 2007-05-01 2008-12-03 Nec Corp Buffering numbered unsegmented PDCP SDUs in 3GPP system to assist efficient hard handover
JP4465015B2 (ja) * 2008-06-20 2010-05-19 株式会社エヌ・ティ・ティ・ドコモ 移動通信方法
WO2012167496A1 (zh) * 2011-08-02 2012-12-13 华为技术有限公司 基于分层云计算的移动蜂窝网络
WO2013038052A1 (en) * 2011-09-12 2013-03-21 Nokia Corporation Method and apparatus for mobile terminal connected mode mobility
US10772021B2 (en) 2014-12-05 2020-09-08 Qualcomm Incorporated Low latency and/or enhanced component carrier discovery for services and handover
JP6728472B2 (ja) * 2017-03-07 2020-07-22 エルジー エレクトロニクス インコーポレイティド Ｃｕ−ｄｕ分割シナリオにおけるデータを送信する方法及び装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101415211A (zh) * 2007-10-16 2009-04-22 华为技术有限公司 一种切换处理方法、系统和装置
US20110261683A1 (en) * 2010-04-26 2011-10-27 Fujitsu Limited Communications system, carrier-side communication apparatus, base station apparatus, and communication method therefor
CN106162730A (zh) * 2016-07-12 2016-11-23 上海华为技术有限公司 一种通信的方法、设备及系统

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3621350A4

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11582659B2 (en) 2019-01-31 2023-02-14 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Network device handover method and terminal device
US11736994B2 (en) 2019-01-31 2023-08-22 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Network device handover method and terminal device

Also Published As

Publication number Publication date
CN109246770A (zh) 2019-01-18
US20200068453A1 (en) 2020-02-27
KR102276720B1 (ko) 2021-07-12
US11265769B2 (en) 2022-03-01
BR112019023221A2 (pt) 2020-05-26
EP3621350A1 (en) 2020-03-11
CA3062360C (en) 2023-12-12
EP3621350A4 (en) 2020-03-11
RU2763519C2 (ru) 2021-12-30
RU2019139385A3 (zh) 2021-06-29
EP3621350B1 (en) 2021-09-22
JP2020519203A (ja) 2020-06-25
JP6920468B2 (ja) 2021-08-18
RU2019139385A (ru) 2021-06-07
CA3062360A1 (en) 2019-11-04
CN109246770B (zh) 2021-06-22
KR20200003898A (ko) 2020-01-10

Similar Documents

Publication Publication Date Title
WO2018202187A1 (zh) 一种切换的方法、终端设备及网络设备
US10805856B2 (en) Methods and units in a network node for handling communication with a wireless device
US12089102B2 (en) Data transmission method and related device
JP7168028B2 (ja) 命令指示方法及び装置、情報交換方法及び装置
KR20230009483A (ko) 핸드오버 방법 및 장치, 단말 장치 및 네트워크 장치
TWI733083B (zh) 與基地台處理一雙連結的裝置及方法
US20220345951A1 (en) Master node, secondary node and user equipment in mobile communication network and communication methods therebetween
JP2019176495A (ja) 基地局及びユーザ機器
US20200280898A1 (en) Method and device for data transmission
US12041497B2 (en) Optional sending of complete message in conditional handover
JP2023500137A (ja) モビリティ最適化方法および関連する装置
US20220256368A1 (en) Master node, secondary node, and methods therefor
WO2020088305A1 (zh) 一种通信方法、通信装置及系统
CN114339714B (zh) 传输配置的方法、装置和设备
US20220256637A1 (en) Master node, secondary node, and methods therefor
KR102455840B1 (ko) 서빙 노드 업데이트 방법, 단말기와 네트워크 장치
WO2021013219A1 (zh) 一种通信方法、终端设备及计算机可读存储介质
US10827403B2 (en) Data transmission method, user equipment, base station, and system
US11129060B2 (en) Handover method and apparatus, and computer storage medium
JP2023547842A (ja) Ｍｒｏ臨界シーンの判定方法、装置及び機器
WO2023011612A1 (zh) 移动性管理的方法及通信装置
WO2023005919A1 (zh) 分组数据汇聚协议状态报告发送方法、设备及装置
EP3783928A1 (en) Billing method and apparatus in wireless communication system

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18794486

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 3062360

Country of ref document: CA

ENP Entry into the national phase

Ref document number: 2019560759

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

REG Reference to national code

Ref country code: BR

Ref legal event code: B01A

Ref document number: 112019023221

Country of ref document: BR

ENP Entry into the national phase

Ref document number: 20197035995

Country of ref document: KR

Kind code of ref document: A

ENP Entry into the national phase

Ref document number: 2018794486

Country of ref document: EP

Effective date: 20191204

ENP Entry into the national phase

Ref document number: 112019023221

Country of ref document: BR

Kind code of ref document: A2

Effective date: 20191105