WO2020001148A1 - 一种切换方法及装置 - Google Patents

一种切换方法及装置 Download PDF

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Publication number
WO2020001148A1
WO2020001148A1 PCT/CN2019/084147 CN2019084147W WO2020001148A1 WO 2020001148 A1 WO2020001148 A1 WO 2020001148A1 CN 2019084147 W CN2019084147 W CN 2019084147W WO 2020001148 A1 WO2020001148 A1 WO 2020001148A1
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WIPO (PCT)
Prior art keywords
tunnel
source
downlink
instruction information
target
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PCT/CN2019/084147
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English (en)
French (fr)
Inventor
刘爱娟
周叶
张大钧
Original Assignee
电信科学技术研究院有限公司
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Application filed by 电信科学技术研究院有限公司 filed Critical 电信科学技术研究院有限公司
Priority to JP2020572727A priority Critical patent/JP7213898B2/ja
Priority to EP19826499.6A priority patent/EP3817451A4/en
Priority to US17/255,427 priority patent/US11277773B2/en
Priority to KR1020217002616A priority patent/KR102466409B1/ko
Publication of WO2020001148A1 publication Critical patent/WO2020001148A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
    • 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
    • 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
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00837—Determination of triggering parameters for hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/38—Reselection control by fixed network equipment
    • H04W36/385—Reselection control by fixed network equipment of the core network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/34—Modification of an existing route
    • H04W40/36—Modification of an existing route due to handover
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00835—Determination of neighbour cell lists
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—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
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/22—Manipulation of transport tunnels
    • 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

Definitions

  • the present application relates to the field of communication technologies, and in particular, to a handover method and device.
  • the radio access network is composed of multiple base stations.
  • the base station and the core network are connected through the S1 interface, and the base stations are connected through the X2 interface.
  • a central node central unit, CU
  • RRC radio resource control
  • the central node CU, and other functions of the base station are deployed on the distribution node (DU).
  • the interface (NG) between the base station and the core network is terminated at the CU, and the interface (Xn) between the base stations is also terminated at the CU.
  • the 5G system further introduces the separation of the Control Plane (CP) / User Plane (UP), that is, the CU is further separated into the central node control layer CU-CP and the central node user layer CU-UP, so that For better management and communication performance.
  • CP Control Plane
  • UP User Plane
  • the embodiments of the present application provide a handover method and device, which are used to reduce the interruption time of data transmission during the DU handover process and improve the user experience in the scenario where the CU-CP / CU-UP is separated in the base station.
  • An embodiment of the present application provides a handover method, which is applied to an access network device in which a central node CU and a distributed node DU are separated.
  • the CU includes a central node control layer CU-CP and a central node user layer CU-UP.
  • Methods include:
  • the CU-CP determines a target DU for the user equipment
  • the CU-CP sends a notification to the CU-UP; wherein the notification includes: tunnel switching instruction information and holding instruction information, and the tunnel switching instruction information is used to instruct the CU-UP to download a source of the user equipment to a downlink
  • the tunnel is converted into a downlink tunnel corresponding to the target DU, and the holding instruction information is used to instruct the CU-UP to continue sending downlink data through the source downlink tunnel.
  • the notification sent by the CU-CP to the CU-UP not only carries the tunnel conversion instruction information, but also carries the maintenance instruction information.
  • the tunnel conversion instruction information can instruct the CU-UP to convert the source downlink tunnel of the user equipment.
  • the downlink tunnel corresponding to the target DU so that after the user equipment successfully connects with the target DU, the user equipment can receive the downlink data sent by the target DU; by keeping the indication information, it instructs the CU-UP to continue to send downlink data through the source downlink tunnel So that the user equipment can also receive downlink data when it is not connected to the target DU, thereby reducing the interruption time of data transmission during the DU handover process and improving the user experience.
  • the holding instruction information includes: temporarily holding the source downlink tunnel instruction information, which is used to instruct the CU-UP to temporarily hold the source downlink tunnel and continue to send downlink data through the source downlink tunnel; Or, the reason for converting the downlink tunnel of the user equipment to cause information of cell switching is used to instruct the CU-UP to continue sending downlink data through the source downlink tunnel when performing downlink tunnel switching due to cell switching.
  • the content of the holding instruction information when the content of the holding instruction information is set, it is not limited to temporarily holding the instruction information of the source downlink tunnel, but may also be reason information for converting the downlink tunnel of the user equipment, so that the CU-UP can continue to send downlink data through the source downlink tunnel. , Increase the flexibility to keep the instructions set.
  • an embodiment of the present application further provides a handover method, including:
  • the central node user layer CU-UP receives a notification sent by the central node control layer CU-CP; wherein the notification includes: tunnel switching instruction information and holding instruction information, and the tunnel switching instruction information is used to instruct the CU-UP to send
  • the source downlink tunnel of the user equipment is converted into a downlink tunnel corresponding to the target DU, and the hold indication information is used to instruct the CU-UP to continue sending downlink data through the source downlink tunnel;
  • the CU-UP converts the source downlink tunnel of the user equipment into a downlink tunnel corresponding to the target DU according to the tunnel conversion instruction information in the notification, and continues to pass through all the traffic according to the hold instruction information in the notification
  • the source downlink tunnel sends downlink data.
  • the notification sent by the CU-CP to the CU-UP not only carries the tunnel conversion instruction information, but also includes holding instruction information.
  • the CU-UP can be instructed to convert the source downlink tunnel of the user equipment into The downlink tunnel corresponding to the target DU, so that after the user equipment successfully connects with the target DU, the user equipment can receive the downlink data sent by the target DU; by keeping the indication information, instructing the CU-UP to continue to send downlink data through the source downlink tunnel, This enables the user equipment to receive downlink data when it is not connected to the target DU, thereby reducing the interruption time of data transmission during the DU handover process and improving the user experience.
  • it further includes:
  • the CU-UP determines a time to start sending downlink data to the target DU through a downlink tunnel corresponding to the target DU.
  • the determining, by the CU-UP, a time to start sending downlink data to the target DU through a downlink tunnel corresponding to the target DU specifically includes:
  • the CU-UP determines that the quality of the wireless link corresponding to the source DU meets a preset condition, the CU-UP stops sending downlink data through the source downlink tunnel and starts to pass through the downlink tunnel corresponding to the target DU. Sending downlink data to the target DU.
  • the CU-UP Since the CU-UP converts the source downlink tunnel of the user equipment to the downlink tunnel corresponding to the target DU according to the tunnel switching instruction information in the notification, and can continue to pass according to the holding instruction information in the notification
  • the source downlink tunnel sends downlink data
  • the source DU continues to send detection information carrying the quality information of the corresponding wireless link to the CU-UP to the user, so that the CU-UP can learn the quality status of the corresponding wireless link.
  • CU-UP can stop sending downlink data through the source downlink tunnel, but send downlink data through the downlink tunnel corresponding to the target DU to reduce the interruption time of data transmission during the DU switching process. .
  • the determining, by the CU-UP, a time to start sending downlink data to the target DU through a downlink tunnel corresponding to the target DU specifically includes:
  • the CU-UP When the CU-UP receives the connection success message sent by the target DU, the CU-UP stops sending downlink data through the source downlink tunnel, and starts to send to the target DU through the downlink tunnel corresponding to the target DU. Send downlink data.
  • the target DU After the user equipment successfully connects with the target DU, the target DU sends a connection success message to the CU-UP, so when the CU-UP can receive the connection success message, it can stop sending data through the source downlink tunnel and respond through the target DU.
  • the downlink tunnel sends downlink data to reduce the interruption time of data transmission during DU switching.
  • the holding instruction information includes: temporarily holding the source downlink tunnel instruction information, which is used to instruct the CU-UP to temporarily hold the source downlink tunnel and continue to send downlink data through the source downlink tunnel; Or, the reason for converting the downlink tunnel of the user equipment to cause information of cell switching is used to instruct the CU-UP to continue sending downlink data through the source downlink tunnel when performing downlink tunnel switching due to cell switching.
  • an embodiment of the present application further provides a switching device in an access network device in which a central node CU and a distributed node DU are separated, and the CU includes a central node control layer CU-CP and a central node user layer CU-UP, the switching device is CU-CP; the switching device includes:
  • a determining unit configured to determine the target DU for the user equipment by the CU-CP
  • a sending unit configured to send a notification from the CU-CP to the CU-UP; wherein the notification includes: tunnel switching instruction information and holding instruction information, and the tunnel switching instruction information is used to instruct the CU-UP to send the notification to the CU-UP
  • the source downlink tunnel of the user equipment is converted into a downlink tunnel corresponding to the target DU, and the holding instruction information is used to instruct the CU-UP to continue sending downlink data through the source downlink tunnel.
  • the holding instruction information includes: temporarily holding the source downlink tunnel instruction information, which is used to instruct the CU-UP to temporarily hold the source downlink tunnel and continue to send downlink data through the source downlink tunnel; Or, the reason for converting the downlink tunnel of the user equipment to cause information of cell switching is used to instruct the CU-UP to continue sending downlink data through the source downlink tunnel when performing downlink tunnel switching due to cell switching.
  • an embodiment of the present application further provides a switching device, such as a CU-UP, including:
  • a receiving unit configured to receive a notification sent by the central node user layer CU-UP from the central node control layer CU-CP; wherein the notification includes: tunnel switching instruction information and holding instruction information, and the tunnel switching instruction information is used to indicate The CU-UP converts the source downlink tunnel of the user equipment into a downlink tunnel corresponding to the target DU, and the holding instruction information is used to instruct the CU-UP to continue sending downlink data through the source downlink tunnel;
  • a conversion unit configured to convert the source downlink tunnel of the user equipment to a downlink tunnel corresponding to the target DU according to the tunnel conversion instruction information in the notification;
  • a holding unit configured for the CU-UP to continue sending downlink data through the source downlink tunnel according to the holding instruction information in the notification.
  • it further includes:
  • a determining unit configured to determine, by the CU-UP, a time to start sending downlink data to the target DU through a downlink tunnel corresponding to the target DU.
  • the determining unit is specifically configured to receive, by the CU-UP, a detection message sent by a source DU and carrying quality information of a corresponding wireless link; wherein the source DU corresponds to the source downlink tunnel
  • the CU-UP determines that the quality of the wireless link corresponding to the source DU meets a preset condition, the CU-UP stops sending downlink data through the source downlink tunnel and starts to pass through the downlink corresponding to the target DU The tunnel sends downlink data to the target DU.
  • the determining unit is specifically configured to: when the CU-UP receives a connection success message sent by the target DU, the CU-UP stops sending downlink data through the source downlink tunnel and starts to pass The downlink tunnel corresponding to the target DU sends downlink data to the target DU.
  • the holding instruction information includes: temporarily holding the source downlink tunnel instruction information, which is used to instruct the CU-UP to temporarily hold the source downlink tunnel and continue to send downlink data through the source downlink tunnel; Or, the reason for converting the downlink tunnel of the user equipment to cause information of cell switching is used to instruct the CU-UP to continue sending downlink data through the source downlink tunnel when performing downlink tunnel switching due to cell switching.
  • an embodiment of the present application further provides a communication device, such as a CU-CP, including:
  • Memory for storing program instructions
  • a processor configured to call a program instruction stored in the memory and execute the program instruction according to the obtained program:
  • the notification includes: tunnel switching instruction information and holding instruction information
  • the tunnel switching instruction information is used to instruct the CU-UP to convert a source downlink tunnel of the user equipment to the user equipment In the downlink tunnel corresponding to the target DU
  • the holding instruction information is used to instruct the CU-UP to continue sending downlink data through the source downlink tunnel.
  • the holding instruction information includes: temporarily holding the source downlink tunnel instruction information, which is used to instruct the CU-UP to temporarily hold the source downlink tunnel and continue to send downlink data through the source downlink tunnel; Or, the reason for converting the downlink tunnel of the user equipment to cause information of cell switching is used to instruct the CU-UP to continue sending downlink data through the source downlink tunnel when performing downlink tunnel switching due to cell switching.
  • an embodiment of the present application further provides a communication device, such as a CU-UP, including:
  • Memory for storing program instructions
  • a processor configured to call a program instruction stored in the memory and execute the program instruction according to the obtained program:
  • the notification includes: tunnel switching instruction information and holding instruction information, and the tunnel switching instruction information is used to instruct the CU-UP to downlink the source of the user equipment
  • the tunnel is converted into a downlink tunnel corresponding to the target DU, and the holding instruction information is used to instruct the CU-UP to continue sending downlink data through the source downlink tunnel;
  • the processor is further configured to:
  • the CU-UP determines a time to start sending downlink data to the target DU through a downlink tunnel corresponding to the target DU.
  • the processor is specifically configured to receive, by the CU-UP, a detection message sent by a source DU and carrying quality information of a corresponding wireless link; wherein the source DU corresponds to the source downlink tunnel
  • the CU-UP determines that the quality of the wireless link corresponding to the source DU meets a preset condition, the CU-UP stops sending downlink data through the source downlink tunnel and starts to pass through the downlink corresponding to the target DU
  • the tunnel sends downlink data to the target DU.
  • the processor is specifically configured to: when the CU-UP receives a connection success message sent by the target DU, the CU-UP stops sending downlink data through the source downlink tunnel and starts to pass The downlink tunnel corresponding to the target DU sends downlink data to the target DU.
  • the holding instruction information includes: temporarily holding the source downlink tunnel instruction information, which is used to instruct the CU-UP to temporarily hold the source downlink tunnel and continue to send downlink data through the source downlink tunnel; Or, the reason for converting the downlink tunnel of the user equipment to cause information of cell switching is used to instruct the CU-UP to continue sending downlink data through the source downlink tunnel when performing downlink tunnel switching due to cell switching.
  • an embodiment of the present application further provides a computer-readable storage medium, where the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to cause the computer to execute any one of the foregoing. method.
  • the notification sent by the CU-CP to the CU-UP not only carries tunnel switching instruction information, but also includes holding instruction information.
  • FIG. 1 is a schematic structural diagram in a CU / DU separation scenario
  • FIG. 2 is a schematic structural diagram in a CU-CP / CU-UP separation scenario
  • FIG. 3 is a flowchart of a handover method provided in an embodiment of the present application.
  • FIG. 7 to 10 are schematic structural diagrams of a switching device provided in an embodiment of the present application.
  • CU is the central node (Central Unit), which can also be referred to as the central unit
  • DU is the distributed node (Distribute Unit), which can also be referred to as the distributed unit
  • the CU / DU separation method is: Radio Resource Control (Radio Resource Control, RRC) ) And Packet Data Convergence Protocol (PDCP) are deployed in the CU, Radio Link Control (RLC), Media Access Control (MAC), physical layer, and radio frequency (Radio Frequency (RF) is deployed in the DU.
  • RRC Radio Resource Control
  • PDCP Packet Data Convergence Protocol
  • RLC Radio Link Control
  • MAC Media Access Control
  • RF Radio Frequency
  • the RRC message is mapped into the corresponding PDCP data stream through the PDCP layer, and then the PDCP data stream is contained in the form of a container in the interface of the CU / DU.
  • AP Application Protocol
  • the control plane After receiving the data stream, the DU is distributed to the corresponding layer 2 entity, and continues to process the data stream and send it to the user equipment (User Equipment) through RF.
  • SCTP Stream Control Transmission Protocol
  • a dedicated user plane tunnel (Data Tunnel, Resource, Bearer, DRB) is established between the CU and the DU.
  • the CU will process the data corresponding to the DRB through PDCP and pass the corresponding tunnel. Passed to DU.
  • different DUs correspond to different tunnels, and one DU corresponds to one tunnel.
  • the CP in CU-CP is the control plane (Control Plane), which can also be called the control layer;
  • the UP in CU-UP is the user plane (User Plane), which can also be called the user plane.
  • a base station may include: one CU-CP, multiple CU-UPs, and multiple DUs.
  • one CU-CP is connected to the DU through the F1 control interface F1-C, and one CU-UP passes through The F1 user interface F1-U is connected to the DU, one CU-UP is connected to the CU-CP through the interface E1, one DU can only be connected to one CU-CP, one CU-UP can only be connected to one CU-CP, and one DU can be connected To multiple CU-UPs under one CU-CP control, one CU-UP can be connected to multiple DUs under one CU-CP control.
  • the embodiments of the present application provide a switching method and device, which are used to reduce the interruption time of data transmission during the DU switching process and improve the user experience in the scenario of CU-CP / CU-UP separation.
  • an embodiment of the present application provides an access network device, which may include: CU-CP and CU-UP;
  • the CU-CP is used to determine a target DU for the user equipment; then, a notification is sent to the CU-UP.
  • CU-UP which is used to receive the notification sent by the CU-CP; then, according to the tunnel switching instruction information in the notification, converting the source downlink tunnel of the user equipment to the downlink tunnel corresponding to the target DU, and according to the holding instruction information in the notification, Continue to send downlink data through the source downlink tunnel.
  • the notification sent by the CU-CP to the CU-UP may be sent in the form of a Bearer Modification Procedure message; and, in the notification sent by the CU-CP to the CU-UP, It may include: tunnel switching instruction information and holding instruction information; wherein, the tunnel switching instruction information is used to instruct the CU-UP to convert the source downlink tunnel of the user equipment into a downlink tunnel corresponding to the target DU, and the holding instruction information is used to instruct the CU-UP to continue Send downlink data through the source downlink tunnel.
  • the notification sent by the CU-CP enables the CU-UP to switch the downlink tunnel of the user equipment according to the notification, and also instructs the CU-UP to continue to send downlink data through the source downlink tunnel to reduce data transmission during the DU handover process. Outage time to improve user experience.
  • the radio link quality of the source and downlink tunnels can also meet the transmission Data requirements
  • the quality of the wireless link of the source downlink tunnel may also meet the data transmission requirements.
  • the CU-UP can continue to send downlink data through the source downlink tunnel to reduce the interruption time of data transmission during the DU handover process; if the CU-UP receives the notification, it is ready to perform the corresponding operation according to the hold instruction information in the notification.
  • the CU-UP cannot continue to send downlink data through the source downlink tunnel.
  • the CU-UP can continue to send downlink data to the source downlink tunnel according to the hold instruction information in the notification.
  • whether the transmission can be successful is also related to the radio link quality of the source downlink tunnel. related.
  • the maintenance instruction information included in the notification sent by the CU-CP to the CU-UP may specifically be: temporarily maintaining the instruction information of the source downlink tunnel for instructing the CU-UP to temporarily Maintain the source downlink tunnel and continue to send downlink data through the source downlink tunnel; or, the reason for converting the downlink tunnel of the user equipment to the reason for cell switching is used to instruct the CU-UP to continue to pass when the downlink tunnel is switched due to the cell switching
  • the source downlink tunnel sends downlink data.
  • the CU-CP can instruct the CU-UP to continue to send downlink data through the source downlink tunnel in two ways; the first way is that the CU-CP can inform the CU-UP of the operation to be performed in an indirect way, For example, the reason for instructing the CU-UP to change the downlink tunnel of the user equipment is cell switching in the hold instruction information. In this way, the CU-UP can continue to send downlink data through the source downlink tunnel when the reason is clear.
  • the second way is that the CU-CP can directly indicate the action to be performed by the CU-UP in the holding instruction information, so that after receiving the holding instruction information, the CU-UP can directly perform temporary holding of the source downlink tunnel, and can Continue to send downlink data through the source downlink tunnel to speed up processing.
  • the CU-UP needs to start sending downlink data through the downlink tunnel corresponding to the target DU to ensure normal communication of the user equipment.
  • how to determine the time when the CU-UP starts to send downlink data to the target DU through the downlink tunnel corresponding to the target DU becomes particularly important.
  • the following two implementation methods may be adopted:
  • the time when the CU-UP starts to send downlink data to the target DU through the downlink tunnel corresponding to the target DU is determined.
  • the source DU For user plane data, after the CU-UP receives the notification sent by the CU-CP and still sends the downlink data through the source downlink tunnel, the source DU will continue to send the user carrying the corresponding wireless link to the CU-UP for the user. Detection message of quality information; and, the source DU corresponds to the source downlink tunnel.
  • the CU-UP determines that the quality of the wireless link corresponding to the source DU meets a preset condition, if the preset condition is that the quality of the wireless link corresponding to the source DU is less than a threshold, that is, the CU-UP finds When the quality of the wireless link is poor and it is no longer possible to send data, at this time, the CU-UP determines that it can start sending downlink data to the target DU through the downlink tunnel corresponding to the target DU, and at the same time stop sending downlink data through the source downlink tunnel.
  • the preset conditions mentioned in the foregoing content of the embodiments of the present application are not limited to the quality of the radio link corresponding to the source DU being less than a threshold value, and may also be other conditions, which are not limited herein.
  • the second implementation manner is to determine a time when the CU-UP starts to send downlink data to the target DU through a downlink tunnel corresponding to the target DU according to a successful connection message with the user equipment provided by the target DU.
  • the source DU will continue to carry the corresponding wireless link sent by the user to the CU-UP. Detection information of the quality information; and, the source DU corresponds to the source downlink tunnel.
  • the time of starting to send downlink data to the target DU through the downlink tunnel corresponding to the target DU is not determined based on the quality of the wireless link of the source downlink tunnel, so although the CU-UP will receive the source DU The detection information sent on the user plane will not respond to the detection information.
  • the target DU can send a connection success message to the CU-UP to notify the CU-UP that it has completed the connection with the user equipment and can perform data transmission. Therefore, at this time, the CU-UP You can start sending downlink data to the target DU through the downlink tunnel corresponding to the target DU, and stop sending downlink data through the source downlink tunnel.
  • the following process may be adopted:
  • Step 1 The user equipment sends a handover request message to the CU-CP.
  • the handover request message carries relevant information about the active DU, such as the identity of the source DU, the downlink tunnel number corresponding to the source DU, etc .; and the handover request message also carries the quality information of the wireless links of the surrounding cells. That is, the user equipment measures the radio link quality of the surrounding cells, and then aggregates the measurement results and sends them to the CU-CP, so that the CU-CP determines the target DU.
  • Step 2 The CU-CP selects a qualified target cell according to the handover request, and sends a user context establishment request (UE context setup request) to the pending DU.
  • UE context setup request UE context setup request
  • a qualified target cell can be understood as: the quality of the wireless link of the target cell is better, which can improve high-quality business services.
  • a base station includes multiple cells, and one cell corresponds to one DU. Therefore, after the target cell is selected, the DU corresponding to the target cell can be selected.
  • the DU corresponding to the target cell is referred to as a pending DU.
  • Step 3 The pending DU sends a feedback message to the CU-CP when it determines that it can provide resources for the user equipment according to the UE context setup request.
  • the pending DU is no longer able to provide resources and business services to the user equipment, it means that the pending DU is not the target DU, so the CU-CP needs to re-wait the DU, that is, repeat step 2. If the pending DU can provide resources and When serving, it can be determined that the pending DU is the target DU.
  • the manner in which the pending DU determines to be able to provide resources for the user equipment may be to establish the context of the user equipment. If the establishment is successful, it indicates that the resources can be provided for the user equipment.
  • Step 4 After receiving the feedback message, the CU-CP determines that the pending DU is the target DU.
  • the connection process between the user equipment and the target DU needs to be performed. Specifically, the following process can be adopted:
  • Step 1 The CU-CP sends a user context update request (UE context modification request) message to the source DU.
  • UE context modification request UE context modification request
  • the UE context modification request message carries a radio resource control container (RRC container).
  • RRC container radio resource control container
  • Step 2 The source DU sends a radio resource control reconfiguration (RRC reconfiguration) message to the user equipment.
  • RRC reconfiguration radio resource control reconfiguration
  • Step 3 The user equipment sends a random access procedure to the target DU.
  • random access can be accomplished through a random access channel (Radom Access Channel, RACH).
  • RACH Random Access Channel
  • Step 4 The user equipment completes the access process and sends a radio resource control reconfiguration complete (RRC reconfiguration complete) message to the target DU to complete the connection with the target DU.
  • RRC reconfiguration complete radio resource control reconfiguration complete
  • the downlink data can continue to be sent through the source downlink tunnel.
  • the connection process between the user equipment and the target DU refer to the connection process in the current technology, and details are not described again.
  • an embodiment of the present application provides a switching method, which is applied to the CU-CP side.
  • the switching method may include:
  • the central node control plane CU-CP determines a target DU for the user equipment.
  • the target DU is determined for the user equipment in the CU-CP, which can be determined according to the measurement result of the quality of the wireless link of the surrounding cell provided by the user equipment to the CU-CP.
  • the duplicated details will not be repeated .
  • the control plane CU-CP of the central node sends a notification to the user plane CU-UP of the central node.
  • the notification includes: tunnel switching instruction information and holding instruction information.
  • the tunnel switching instruction information is used to instruct the central node user plane CU-UP to send the user
  • the source downlink tunnel of the device is converted into the downlink tunnel corresponding to the target DU, and the holding instruction information is used to instruct the user plane CU-UP of the central node to continue sending downlink data through the source downlink tunnel.
  • connection process between the user equipment and the target DU reference may be made to the foregoing content, and duplicated details are not described again.
  • the notification sent by the CU-CP to the CU-UP not only carries the tunnel conversion instruction information, but also includes holding instruction information.
  • the CU-UP can be instructed to convert the source downlink tunnel of the user equipment into The downlink tunnel corresponding to the target DU, so that after the user equipment successfully connects with the target DU, the user equipment can receive the downlink data sent by the target DU; by keeping the indication information, instructing the CU-UP to continue to send downlink data through the source downlink tunnel, This enables the user equipment to receive downlink data when it is not connected to the target DU, thereby reducing the interruption time of data transmission during the DU handover process and improving the user experience.
  • the holding instruction information may include: temporary holding source downlink tunnel instruction information, which is used to instruct the CU-UP to temporarily hold the source downlink tunnel and continue to send downlink data through the source downlink tunnel; or, convert the downlink tunnel of the user equipment.
  • the reason is the reason information of the cell switching, which is used to instruct the CU-UP to continue to send downlink data through the source downlink tunnel when the downlink tunnel is switched due to the cell switching.
  • the CU-UP when setting the content of the holding instruction information, it is not limited to temporarily holding the instruction information of the source downlink tunnel, but may also be reason information for switching the downlink tunnel of the user equipment, so that the CU-UP can continue to send downlink data through the source downlink tunnel. , Increase the flexibility to keep the instructions set.
  • an embodiment of the present application provides a switching method, which is applied to the CU-UP side.
  • the switching method may include:
  • the user plane CU-UP of the central node receives a notification sent by the central node control plane CU-CP.
  • the notification may include: tunnel switching instruction information and holding instruction information.
  • the tunnel switching instruction information is used to instruct the CU-UP to convert the source downlink tunnel of the user equipment to a downlink tunnel corresponding to the target DU.
  • the holding instruction information is used to indicate the CU-UP. Continue to send downlink data through the source downlink tunnel;
  • the user plane CU-UP of the central node converts the source downlink tunnel of the user equipment into a downlink tunnel corresponding to the target DU according to the tunnel switching instruction information in the notification, and continues to send downlink through the source downlink tunnel according to the holding instruction information in the notification. data.
  • the notification sent by the CU-CP to the CU-UP not only carries the tunnel conversion instruction information, but also includes holding instruction information.
  • the CU-UP can be instructed to convert the source downlink tunnel of the user equipment into The downlink tunnel corresponding to the target DU, so that after the user equipment successfully connects with the target DU, the user equipment can receive the downlink data sent by the target DU; by keeping the indication information, instructing the CU-UP to continue to send downlink data through the source downlink tunnel, This enables the user equipment to receive downlink data when it is not connected to the target DU, thereby reducing the interruption time of data transmission during the DU handover process and improving the user experience.
  • the method may further include:
  • the CU-UP determines the time to start sending downlink data to the target DU through the downlink tunnel corresponding to the target DU.
  • the time when the CU-UP determines to start sending downlink data to the target DU through the downlink tunnel corresponding to the target DU may specifically include:
  • the CU-UP receives a detection message sent by the source DU and carries the quality information of the corresponding wireless link; where the source DU corresponds to the source downlink tunnel;
  • the CU-UP determines that the quality of the wireless link corresponding to the source DU meets a preset condition, the CU-UP stops sending downlink data through the source downlink tunnel and starts sending downlink data to the target DU through the downlink tunnel corresponding to the target DU.
  • step S402 because the source DU continues to send detection information carrying the quality information of the corresponding wireless link to the CU-UP towards the user, the CU-UP can learn the quality status of the wireless link of the source downlink tunnel, and When the quality of the link cannot meet the preset conditions, CU-UP can stop sending downlink data through the source downlink tunnel, but send downlink data through the downlink tunnel corresponding to the target DU to reduce the interruption time of data transmission during the DU switching process. .
  • the preset condition may be set as follows: the quality of the wireless link corresponding to the source DU is less than a threshold, but is not limited to this; and the threshold may be set according to actual conditions to meet various applications The needs of the scenario.
  • the time when the CU-UP determines to start sending downlink data to the target DU through the downlink tunnel corresponding to the target DU may specifically include:
  • the CU-UP When the CU-UP receives the connection success message sent by the target DU, the CU-UP stops sending downlink data through the source downlink tunnel and starts sending downlink data to the target DU through the downlink tunnel corresponding to the target DU.
  • the target DU can send a connection success message to the CU-UP, so when the CU-UP can receive the connection success message, it can stop sending data through the source downlink tunnel, but through the target
  • the downlink tunnel corresponding to the DU sends downlink data to reduce the interruption time of data transmission during the DU switching process.
  • Embodiment 1 In conjunction with the interaction flowchart shown in FIG. 5, an example is performed based on the quality information of the wireless link corresponding to the source DU to determine the time when the CU-UP starts to send downlink data to the target DU through the downlink tunnel corresponding to the target DU. Instructions.
  • the UE provides the CU-CP with a measurement result of the radio link quality of the neighboring cell.
  • the CU-CP selects a suitable target DU according to the measurement result, and the target DU sends a UE context request to enable the target DU to establish the context of the UE.
  • the CU-CP sends a bearer modification procedure message to the CU-UP.
  • the CU-UP updates the downlink tunnel of the UE and can continue to send downlink data to the source DU.
  • the source DU sends a RADIO link quality message to the CU-UP.
  • the CU-CP sends a UE modification message carrying the RRC container to the source DU.
  • the source DU sends an RRC reconfiguration message to the UE.
  • the UE initiates a random access procedure to the target DU.
  • the UE completes the access process and sends an RRC reconfiguration complete message to the target DU.
  • the CU-CP starts to send downlink data to the target DU through the downlink tunnel corresponding to the target DU.
  • Embodiment 2 In conjunction with the interaction flowchart shown in FIG. 6, the time when a CU-UP starts to send downlink data to the target DU through the downlink tunnel corresponding to the target DU is taken as an example according to the successful connection message with the user equipment provided by the target DU as an example. Be explained.
  • the UE provides the CU-CP with a measurement result of the radio link quality of the neighboring cell.
  • the CU-CP selects a suitable target DU according to the measurement result, and the target DU sends a UE context request to enable the target DU to establish the context of the UE.
  • the CU-CP sends a bearer modification procedure message to the CU-UP.
  • the CU-UP updates the downlink tunnel of the UE and can continue to send downlink data to the source DU.
  • the source DU sends a RADIO link quality message to the CU-UP.
  • the CU-CP sends a UE modification message carrying the RRC container to the source DU.
  • the source DU sends an RRC reconfiguration message to the UE.
  • the UE initiates a random access procedure to the target DU.
  • the target DU After the target DU determines that the UE has successfully accessed, it sends a connection success message to the CU-UP.
  • the CU-CP starts to send downlink data to the target DU through the downlink tunnel corresponding to the target DU;
  • the UE sends an RRC reconfiguration complete message to the target DU.
  • an embodiment of the present application further provides a switching device, such as a CU-CP.
  • the switching device may include:
  • a determining unit 701 configured to determine a target distributed node DU for a user equipment by a central node control layer CU-CP;
  • the sending unit 702 is configured to send a notification to the user layer CU-UP of the central node by the CU-CP.
  • the notification includes: tunnel switching instruction information and holding instruction information.
  • the tunnel switching instruction information is used to instruct the CU-UP to send the source of the user equipment to the downlink.
  • the tunnel is converted into a downlink tunnel corresponding to the target DU, and the holding instruction information is used to instruct the CU-UP to continue to send downlink data through the source downlink tunnel.
  • the holding instruction information includes: temporarily holding the source downlink tunnel instruction information, which is used to instruct the CU-UP to temporarily maintain the source downlink tunnel and continue to send downlink data through the source downlink tunnel; or, conversion
  • the cause of the downlink tunnel of the user equipment is the reason information of the cell switching, which is used to instruct the CU-UP to continue to send downlink data through the source downlink tunnel when the downlink tunnel is switched due to the cell switching.
  • an embodiment of the present application further provides a communication device, such as a CU-CP, as shown in FIG. 8, including:
  • the processor 802 is configured to call a program instruction stored in the memory and execute the program instruction according to the obtained program:
  • the notification includes: tunnel switching instruction information and holding instruction information
  • the tunnel switching instruction information is used to instruct the CU-UP to convert the source downlink tunnel of the user equipment to a downlink tunnel corresponding to the target DU
  • the holding instruction information Used to instruct the CU-UP to continue sending downlink data through the source downlink tunnel.
  • the holding instruction information includes: temporarily holding the source downlink tunnel instruction information, which is used to instruct the CU-UP to temporarily maintain the source downlink tunnel and continue to send downlink data through the source downlink tunnel; or, conversion
  • the cause of the downlink tunnel of the user equipment is the reason information of the cell switching, which is used to instruct the CU-UP to continue to send downlink data through the source downlink tunnel when the downlink tunnel is switched due to the cell switching.
  • the switching device may further include a network interface 803, and the network interface 803 may be used to send and receive data under the control of the processor 802.
  • the bus architecture may include any number of interconnected buses and bridges. Specifically, one or more processors represented by the processor 802 and various circuits of the memory represented by the memory 801 are linked together.
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art, so they are not further described herein.
  • the bus interface provides an interface.
  • the network interface 803 may be multiple elements, including a transmitter and a receiver, providing a unit for communicating with various other devices on a transmission medium. For different user devices, the user interface may also be an interface capable of externally connecting and connecting the required devices.
  • the connected devices include, but are not limited to, a keypad, a display, a speaker, a microphone, a joystick, and the like.
  • the processor 802 is responsible for managing the bus architecture and general processing, and the memory 801 may store data used by the processor 802 when performing operations.
  • the processor 802 in the embodiment of the present application may be a central processing unit (CPU), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a complex programmable Logic Device (Complex Programmable Logic Device, CPLD).
  • CPU central processing unit
  • ASIC application specific integrated circuit
  • FPGA field-programmable gate array
  • CPLD complex programmable Logic Device
  • an embodiment of the present application further provides a switching device, such as CU-UP.
  • the switching device may include:
  • the receiving unit 901 is configured to receive a notification sent by the central node user layer CU-UP from the central node control layer CU-CP.
  • the notification includes: tunnel switching instruction information and holding instruction information.
  • the tunnel switching instruction information is used to instruct the CU-UP to send
  • the source downlink tunnel of the user equipment is converted into a downlink tunnel corresponding to the target DU, and the holding instruction information is used to instruct the CU-UP to continue to send downlink data through the source downlink tunnel;
  • a converting unit 902 configured to convert the source downlink tunnel of the user equipment to a downlink tunnel corresponding to the target DU according to the tunnel switching instruction information in the notification;
  • the holding unit 903 is configured for the CU-UP to continue to send downlink data through the source downlink tunnel according to the holding instruction information in the notification.
  • it may further include:
  • a determining unit 904 is configured for the CU-UP to determine a time to start sending downlink data to the target DU through a downlink tunnel corresponding to the target DU.
  • the determining unit 904 is specifically configured to receive the detection message sent by the source DU and carries the quality information of the corresponding wireless link, where the source DU corresponds to the source downlink tunnel ;
  • the CU-UP determines that the quality of the wireless link corresponding to the source DU meets a preset condition, the CU-UP stops sending downlink data through the source downlink tunnel and starts sending downlink data to the target DU through the downlink tunnel corresponding to the target DU.
  • the determining unit 904 is specifically configured to, when the CU-UP receives the connection success message sent by the target DU, the CU-UP stops sending downlink data through the source downlink tunnel and starts to correspond through the target DU.
  • the downlink tunnel sends downlink data to the target DU.
  • an embodiment of the present application further provides a communication device, as shown in FIG. 10, which may include:
  • the processor 1002 is configured to call a program instruction stored in the memory and execute the program instruction according to the obtained program:
  • the notification includes: tunnel switching instruction information and holding instruction information, and the tunnel switching instruction information is used to instruct the central node user layer CU-UP to convert the source downlink tunnel of the user equipment to the target
  • the downlink tunnel corresponding to the DU holds the indication information to instruct the CU-UP to continue to send downlink data through the source downlink tunnel;
  • the source downlink tunnel of the user equipment is converted into a downlink tunnel corresponding to the target DU, and according to the holding instruction information in the notification, downlink data is continuously sent through the source downlink tunnel.
  • the processor is further configured to:
  • the CU-UP determines a time to start sending downlink data to the target DU through a downlink tunnel corresponding to the target DU.
  • the processor is specifically configured to receive, by the CU-UP, a detection message sent by a source DU and carrying quality information of a corresponding wireless link; wherein the source DU corresponds to the source downlink tunnel
  • the CU-UP determines that the quality of the wireless link corresponding to the source DU meets a preset condition, the CU-UP stops sending downlink data through the source downlink tunnel and starts to pass through the downlink corresponding to the target DU
  • the tunnel sends downlink data to the target DU.
  • the processor is specifically configured to: when the CU-UP receives a connection success message sent by the target DU, the CU-UP stops sending downlink data through the source downlink tunnel and starts to pass The downlink tunnel corresponding to the target DU sends downlink data to the target DU.
  • the holding instruction information includes: temporarily holding the source downlink tunnel instruction information, which is used to instruct the CU-UP to temporarily hold the source downlink tunnel and continue to send downlink data through the source downlink tunnel; Or, the reason for converting the downlink tunnel of the user equipment to cause information of cell switching is used to instruct the CU-UP to continue sending downlink data through the source downlink tunnel when performing downlink tunnel switching due to cell switching.
  • the switching device may further include a network interface 1003, and the network interface 1003 may be used to send and receive data under the control of the processor 1002.
  • the bus architecture may include any number of interconnected buses and bridges. Specifically, one or more processors represented by the processor 1002 and various circuits of the memory represented by the memory 1001 are linked together.
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art, so they are not further described herein.
  • the bus interface provides an interface.
  • the network interface 1003 may be a plurality of elements, including a transmitter and a receiver, providing a unit for communicating with various other devices on a transmission medium. For different user devices, the user interface may also be an interface capable of externally connecting and connecting the required devices.
  • the connected devices include, but are not limited to, a keypad, a display, a speaker, a microphone, a joystick, and the like.
  • the processor 1002 is responsible for managing the bus architecture and general processing.
  • the memory 1001 may store data used by the processor 1002 when performing operations.
  • the processor 1002 in the embodiment of the present application may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a complex programmable Logic Device (Complex Programmable Logic Device, CPLD).
  • CPU central processing unit
  • ASIC application-specific integrated circuit
  • FPGA field-programmable gate array
  • CPLD complex programmable Logic Device
  • any memory mentioned in the embodiments of the present application may include a read-only memory (ROM) and a random access memory (RAM), and provide the processor with program instructions and data stored in the memory.
  • the memory may be used to store a program of any method provided in the embodiment of the present application.
  • the processor invokes program instructions stored in the memory, and the processor is configured to execute any method provided in the embodiments of the present application according to the obtained program instructions.
  • an embodiment of the present application further provides a computer-readable storage medium.
  • the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to cause a computer to execute any one of the foregoing methods.
  • a computer-readable storage medium may be any available medium or data storage device that can be accessed by a computer, including but not limited to magnetic storage (e.g., a floppy disk, hard disk, magnetic tape, magneto-optical disk (MO), etc.), optical storage (such as a compact disk (CD) , Digital Versatile Disc (DVD), Blu-ray Disc (BD), High-Definition Versatile Disc (HVD), etc., and Semiconductor Memory (e.g. ROM, Erasable Programmable Read-Only Memory (EPROM), Live Erasable Programmable Read-Write Memory (EEPROM), non-volatile memory (NAND, FLASH), solid-state hard disk (SSD), etc.
  • magnetic storage e.g., a floppy disk, hard disk, magnetic tape, magneto-optical disk (MO), etc.
  • optical storage such as a compact disk (CD) , Digital Versatile Disc (DVD), Blu-ray Disc (BD), High-Definition
  • the terminal may also be referred to as a terminal, a mobile station ("MS" for short), a mobile terminal (Mobile), etc.
  • the terminal Can have the ability to communicate with one or more core networks via a Radio Access Network (RAN).
  • RAN Radio Access Network
  • the terminal can be a mobile phone (or called a "cellular" phone), or a computer with a mobile nature, etc.
  • the terminal may also be a portable, compact, handheld, computer-built or vehicle-mounted mobile device.
  • An access network device may be a base station (for example, an access point), which refers to a device in an access network that communicates with a wireless terminal through one or more sectors on an air interface.
  • the base station can be used to convert the received air frame and the Internet Protocol IP packet into each other and act as a router between the wireless terminal and the rest of the access network, wherein the rest of the access network can include an Internet Protocol (IP) network.
  • IP Internet Protocol
  • the base station can also coordinate the management of the attributes of the air interface.
  • the base station can be a Global System for Mobile Communications (GSM) or a base station in Base Station (BTS), or a base station (NodeB) in Wideband Code Division Multiple Access (CDMA).
  • GSM Global System for Mobile Communications
  • BTS Base Station
  • NodeB base station
  • CDMA Wideband Code Division Multiple Access
  • It may also be an evolved base station (NodeB or base station (eNB) or base station (e-NodeB, evolutional NodeB)) in LTE,
  • the processing flow of the above method may be implemented by a software program, and the software program may be stored in a storage medium.
  • the stored software program is called, the above method steps are performed.
  • this application may be provided as a method, a system, or a computer program product. Therefore, this application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, this application may take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, magnetic disk storage, optical storage, and the like) containing computer-usable program code.
  • computer-usable storage media including, but not limited to, magnetic disk storage, optical storage, and the like
  • These computer program instructions may also be stored in a computer-readable memory that can guide a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including the instruction device, and the instruction device implements The functions specified in one block or blocks of the flowchart or one block or blocks.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of steps can be performed on the computer or other programmable device to produce a computer-implemented process, which can be executed on the computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more flowcharts and / or one or more blocks of the block diagrams.
  • the embodiments of the present application provide a switching method and device, by which the notification sent by the CU-CP to the CU-UP not only carries tunnel switching instruction information, but also includes holding instruction information.
  • the tunnel switching instruction information Instruct CU-UP to convert the source downlink tunnel of the user equipment to the downlink tunnel corresponding to the target DU, so that after the user equipment successfully connects with the target DU, the user equipment can receive the downlink data sent by the target DU; by keeping the indication information, the instruction CU-UP can continue to send downlink data through the source downlink tunnel, so that when the user equipment is not connected to the target DU, it can also receive downlink data, thereby reducing the interruption time of data transmission during the DU handover process and improving the user experience.

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Abstract

本申请公开了一种切换方法及装置，涉及通信技术领域，用以在基站内中心节点控制层/中心节点用户层CU-CP/CU-UP分离的场景下，减少在分布式节点DU切换过程中数据传输的中断时间，提高用户体验。本申请实施例提供的切换方法，使得CU-CP向CU-UP发送的通知中不仅携带有隧道转换指示信息，还包括保持指示信息，通过保持指示信息，指示CU-UP可以继续通过源下行隧道发送下行数据，使得用户设备在与目标DU未连接时，还可以接收到下行数据，从而减少在DU切换过程中数据传输的中断时间，提高用户体验。

Description

一种切换方法及装置
本申请要求在2018年6月26日提交中国专利局、申请号为201810672666.X、申请名称为“一种切换方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，尤指一种切换方法及装置。
背景技术
在长期演进LTE(Long Term Evolution)系统中，无线接入网由多个基站组成，基站与核心网之间通过S1接口连接，基站之间通过X2接口连接。在5G系统中，引入一个中心节点(central unit,CU)进行集中的控制和调度，并且，将无线资源控制(Radio Resource Control,RRC)的功能以及部分层2或/和层1的功能部署在中心节点CU，而基站的其他功能则部署在分布节点(distribute unit,DU)上。基于此，基站与核心网之间的接口(NG)中止于CU，基站之间的接口(Xn)也中止于CU。此外，5G系统进一步引入了控制层(Control Plane,CP)/用户层(User Plane,UP)的分离，即对于CU进一步分离为中心节点控制层CU-CP和中心节点用户层CU-UP，以便于实现更加优异的管理和通信性能。
发明内容
本申请实施例提供了一种切换方法及装置，用以在基站内CU-CP/CU-UP分离的场景下，减少在DU切换过程中数据传输的中断时间提高用户体验。
本申请实施例提供了一种切换方法，应用于中心节点CU和分布式节点DU分离的接入网设备，所述CU包括中心节点控制层CU-CP和中心节点用户层CU-UP，所述方法包括：
所述CU-CP为用户设备确定目标DU；
所述CU-CP向CU-UP发送通知；其中，所述通知包括：隧道转换指示信息和保持指示信息，所述隧道转换指示信息用于指示所述CU-UP将所述用户设备的源下行隧道转换为所述目标DU对应的下行隧道，所述保持指示信息用于指示所述CU-UP继续通过所述源下行隧道发送下行数据。
通过该方法，使得CU-CP向CU-UP发送的通知中不仅携带有隧道转换指示信息，还携带有保持指示信息，通过隧道转换指示信息，可以指示CU-UP将用户设备的源下行隧道转换为目标DU对应的下行隧道，以便于在用户设备成功与目标DU连接之后，用户设备可以接收到目标DU发送的下行数据；通过保持指示信息，指示CU-UP可以继续通过源下行隧道发送下行数据，使得用户设备在与目标DU未连接时，还可以接收到下行数据，从而减少在DU切换过程中数据传输的中断时间，提高用户体验。
可选地，所述保持指示信息包括：暂时保持所述源下行隧道的指示信息，用于指示所述CU-UP暂时保持所述源下行隧道，并继续通过所述源下行隧道发送下行数据；或，转换所述用户设备的下行隧道的原因为小区切换的原因信息，用于指示所述CU-UP在因小区切换进行下行隧道转换时，继续通过所述源下行隧道发送下行数据。
从而，在设置保持指示信息的内容时，并不限于只是暂时保持源下行隧道的指示信息，还可以是转换用户设备的下行隧道的原因信息，使得CU-UP可以继续通过源下行隧道发送下行数据，增加保持指示信息设置的灵活性。
第二方面，本申请实施例还提供了一种切换方法，包括：
中心节点用户层CU-UP接收中心节点控制层CU-CP发送的通知；其中，所述通知包括：隧道转换指示信息和保持指示信息，所述隧道转换指示信息用于指示所述CU-UP将所述用户设备的源下行隧道转换为目标DU对应的下行隧道，所述保持指示信息用于指示所述CU-UP继续通过所述源下行隧道发送下行数据；
所述CU-UP根据所述通知中的隧道转换指示信息，将所述用户设备的源 下行隧道转换为所述目标DU对应的下行隧道，并根据所述通知中的保持指示信息，继续通过所述源下行隧道发送下行数据。
通过该方法，使得CU-CP向CU-UP发送的通知中不仅携带有隧道转换指示信息，还包括保持指示信息，通过隧道转换指示信息，可以指示CU-UP将用户设备的源下行隧道转换为目标DU对应的下行隧道，以便于在用户设备成功与目标DU连接之后，用户设备可以接收到目标DU发送的下行数据；通过保持指示信息，指示CU-UP可以继续通过源下行隧道发送下行数据，使得用户设备在与目标DU未连接时，还可以接收到下行数据，从而减少在DU切换过程中数据传输的中断时间，提高用户体验。
可选地，还包括：
所述CU-UP确定开始通过所述目标DU对应的下行隧道向所述目标DU发送下行数据的时间。
从而，可以确定出CU-UP何时向目标DU发送下行数据。
可选地，所述CU-UP确定开始通过所述目标DU对应的下行隧道向所述目标DU发送下行数据的时间，具体包括：
所述CU-UP接收源DU发送的携带有对应的无线链路的质量信息的检测消息；其中，所述源DU与所述源下行隧道相对应；
所述CU-UP在确定所述源DU对应的无线链路的质量满足预设条件时，所述CU-UP停止通过所述源下行隧道发送下行数据，开始通过所述目标DU对应的下行隧道向所述目标DU发送下行数据。
由于在CU-UP根据所述通知中的隧道转换指示信息，将所述用户设备的源下行隧道转换为所述目标DU对应的下行隧道，并根据所述通知中的保持指示信息，可以继续通过所述源下行隧道发送下行数据时，源DU继续在用户面向CU-UP发送携带有对应的无线链路的质量信息的检测信息，使得CU-UP可以获知相应无线链路的质量状况，在无线链路的质量不能满足预设条件时，CU-UP则可以停止通过源下行隧道继续发送下行数据，而是通过目标DU对应的下行隧道发送下行数据，以减少DU切换过程中数据传输的中断 时间。
可选地，所述CU-UP确定开始通过所述目标DU对应的下行隧道向所述目标DU发送下行数据的时间，具体包括：
所述CU-UP在接收到所述目标DU发送的连接成功消息时，所述CU-UP停止通过所述源下行隧道发送下行数据，开始通过所述目标DU对应的下行隧道向所述目标DU发送下行数据。
在用户设备与目标DU成功连接后，目标DU会向CU-UP发送连接成功消息，所以CU-UP可以在接收到该连接成功消息时，即可停止通过源下行隧道发送数据，通过目标DU对应的下行隧道发送下行数据，以减少DU切换过程中数据传输的中断时间。
可选地，所述保持指示信息包括：暂时保持所述源下行隧道的指示信息，用于指示所述CU-UP暂时保持所述源下行隧道，并继续通过所述源下行隧道发送下行数据；或，转换所述用户设备的下行隧道的原因为小区切换的原因信息，用于指示所述CU-UP在因小区切换进行下行隧道转换时，继续通过所述源下行隧道发送下行数据。
第三方面，本申请实施例还提供了一种切换装置，在中心节点CU和分布式节点DU分离的接入网设备中，且所述CU包括中心节点控制层CU-CP和中心节点用户层CU-UP，所述切换装置如CU-CP；所述切换装置包括：
确定单元，用于所述CU-CP为用户设备确定目标DU；
发送单元，用于所述CU-CP向CU-UP发送通知；其中，所述通知包括：隧道转换指示信息和保持指示信息，所述隧道转换指示信息用于指示所述CU-UP将所述用户设备的源下行隧道转换为所述目标DU对应的下行隧道，所述保持指示信息用于指示所述CU-UP继续通过所述源下行隧道发送下行数据。
可选地，所述保持指示信息包括：暂时保持所述源下行隧道的指示信息，用于指示所述CU-UP暂时保持所述源下行隧道，并继续通过所述源下行隧道发送下行数据；或，转换所述用户设备的下行隧道的原因为小区切换的原因 信息，用于指示所述CU-UP在因小区切换进行下行隧道转换时，继续通过所述源下行隧道发送下行数据。
第四方面，本申请实施例还提供了一种切换装置，如CU-UP，包括：
接收单元，用于中心节点用户层CU-UP接收中心节点控制层CU-CP发送的通知；其中，所述通知包括：隧道转换指示信息和保持指示信息，所述隧道转换指示信息用于指示所述CU-UP将所述用户设备的源下行隧道转换为目标DU对应的下行隧道，所述保持指示信息用于指示所述CU-UP继续通过所述源下行隧道发送下行数据；
转换单元，用于所述CU-UP根据所述通知中的隧道转换指示信息，将所述用户设备的源下行隧道转换为所述目标DU对应的下行隧道；
保持单元，用于所述CU-UP根据所述通知中的保持指示信息，继续通过所述源下行隧道发送下行数据。
可选地，还包括：
确定单元，用于所述CU-UP确定开始通过所述目标DU对应的下行隧道向所述目标DU发送下行数据的时间。
可选地，所述确定单元，具体用于所述CU-UP接收源DU发送的携带有对应的无线链路的质量信息的检测消息；其中，所述源DU与所述源下行隧道相对应；所述CU-UP在确定所述源DU对应的无线链路的质量满足预设条件时，所述CU-UP停止通过所述源下行隧道发送下行数据，开始通过所述目标DU对应的下行隧道向所述目标DU发送下行数据。
可选地，所述确定单元，具体用于所述CU-UP在接收到所述目标DU发送的连接成功消息时，所述CU-UP停止通过所述源下行隧道发送下行数据，开始通过所述目标DU对应的下行隧道向所述目标DU发送下行数据。
可选地，所述保持指示信息包括：暂时保持所述源下行隧道的指示信息，用于指示所述CU-UP暂时保持所述源下行隧道，并继续通过所述源下行隧道发送下行数据；或，转换所述用户设备的下行隧道的原因为小区切换的原因信息，用于指示所述CU-UP在因小区切换进行下行隧道转换时，继续通过所 述源下行隧道发送下行数据。
第五方面，本申请实施例还提供了一种通信装置，如CU-CP，包括：
存储器，用于存储程序指令；
处理器，用于调用所述存储器中存储的程序指令，按照获得的程序执行：
为用户设备确定目标DU；
向CU-UP发送通知；其中，所述通知包括：隧道转换指示信息和保持指示信息，所述隧道转换指示信息用于指示所述CU-UP将所述用户设备的源下行隧道转换为所述目标DU对应的下行隧道，所述保持指示信息用于指示所述CU-UP继续通过所述源下行隧道发送下行数据。
可选的，所述保持指示信息包括：暂时保持所述源下行隧道的指示信息，用于指示所述CU-UP暂时保持所述源下行隧道，并继续通过所述源下行隧道发送下行数据；或，转换所述用户设备的下行隧道的原因为小区切换的原因信息，用于指示所述CU-UP在因小区切换进行下行隧道转换时，继续通过所述源下行隧道发送下行数据。
第六方面，本申请实施例还提供了一种通信装置，如CU-UP，包括：
存储器，用于存储程序指令；
处理器，用于调用所述存储器中存储的程序指令，按照获得的程序执行：
接收中心节点控制层CU-CP发送的通知；其中，所述通知包括：隧道转换指示信息和保持指示信息，所述隧道转换指示信息用于指示所述CU-UP将所述用户设备的源下行隧道转换为目标DU对应的下行隧道，所述保持指示信息用于指示所述CU-UP继续通过所述源下行隧道发送下行数据；
根据所述通知中的隧道转换指示信息，将所述用户设备的源下行隧道转换为所述目标DU对应的下行隧道，并根据所述通知中的保持指示信息，继续通过所述源下行隧道发送下行数据。
可选的，所述处理器还用于：
所述CU-UP确定开始通过所述目标DU对应的下行隧道向所述目标DU发送下行数据的时间。
可选的，所述处理器，具体用于所述CU-UP接收源DU发送的携带有对应的无线链路的质量信息的检测消息；其中，所述源DU与所述源下行隧道相对应；所述CU-UP在确定所述源DU对应的无线链路的质量满足预设条件时，所述CU-UP停止通过所述源下行隧道发送下行数据，开始通过所述目标DU对应的下行隧道向所述目标DU发送下行数据。
可选的，所述处理器，具体用于所述CU-UP在接收到所述目标DU发送的连接成功消息时，所述CU-UP停止通过所述源下行隧道发送下行数据，开始通过所述目标DU对应的下行隧道向所述目标DU发送下行数据。
可选的，所述保持指示信息包括：暂时保持所述源下行隧道的指示信息，用于指示所述CU-UP暂时保持所述源下行隧道，并继续通过所述源下行隧道发送下行数据；或，转换所述用户设备的下行隧道的原因为小区切换的原因信息，用于指示所述CU-UP在因小区切换进行下行隧道转换时，继续通过所述源下行隧道发送下行数据。
第七方面，本申请实施例还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存储有计算机可执行指令，所述计算机可执行指令用于使所述计算机执行上述任一种方法。
本申请有益效果如下：
本申请实施例提供的一种切换方法及装置，通过该方法，使得CU-CP向CU-UP发送的通知中不仅携带有隧道转换指示信息，还包括保持指示信息，通过隧道转换指示信息，可以指示CU-UP将用户设备的源下行隧道转换为目标DU对应的下行隧道，以便于在用户设备成功与目标DU连接之后，用户设备可以接收到目标DU发送的下行数据；通过保持指示信息，指示CU-UP可以继续通过源下行隧道发送下行数据，使得用户设备在与目标DU未连接时，还可以接收到下行数据，从而减少在DU切换过程中数据传输的中断时间，提高用户体验。
附图说明
图1为CU/DU分离场景下的结构示意图；
图2为CU-CP/CU-UP分离场景下的结构示意图；
图3为本申请实施例中提供的一种切换方法的流程图；
图4为本申请实施例中提供的另一种切换方法的流程图；
图5为实施例一的交互流程图；
图6为实施例二的交互流程图；
图7至图10分别为本申请实施例中提供的切换装置的结构示意图。
具体实施方式
下面将结合附图，对本申请实施例提供的一种切换方法及装置的具体实施方式进行详细地说明。需要说明的是，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
首先，对本申请中的部分用语进行解释说明，以便于本领域技术人员理解。
1、接入网设备中CU/DU分离的架构。
CU为中心节点(Central Unit)，也可以称为中心单元；DU为分布式节点(Distribute Unit)，也可以称为分布单元；CU/DU的分离方式为：无线资源控制(Radio Resource Control,RRC)和分组数据汇聚协议(Packet Data Convergence Protocol,PDCP)部署在CU中，无线链路控制(Radio Link Control,RLC)、媒体接入控制(Media Access Control,MAC)、物理层、以及射频(Radio Frequency,RF)部署在DU中。
参见图1所示，对于控制面信令，在CU中，将RRC消息经过PDCP层映射成对应的PDCP数据流，然后将该PDCP数据流以容器(Container)的形式包含在CU/DU的接口AP(Application Protocol,应用协议)消息中，并通过控制面进行传递。DU接收到该数据流后分发到相应的层2实体上，继续 对该数据流进行处理并通过RF发送给用户设备(User Equipment,UE)。其中，由于控制面采用了流控制传输协议(Stream Control Transmission Protocol,SCTP)协议栈，保证了数据传输的可靠性。
对于用户面数据，CU与DU之间会对每一个数据承载(Data Resource Bearer,DRB)建立一个专门的用户面隧道(Tunnel)，CU将DRB对应的数据在经过PDCP处理后，通过相应的Tunnel传递给DU。其中，不同的DU对应不同的Tunnel，且一个DU对应一条Tunnel。
2、CU中CU-CP/CU-UP分离的架构。
CU-CP中的CP为控制面(Control Plane)，也可以称为控制层；CU-UP中的UP为用户面(User Plane)，也可以称为用户层。
参见图2所示，一个基站内可以包括：一个CU-CP，多个CU-UP，以及多个DU；其中，一个CU-CP通过F1控制接口F1-C连接到DU，一个CU-UP通过F1用户接口F1-U连接到DU，一个CU-UP通过接口E1连接到CU-CP，一个DU只能连接一个CU-CP，一个CU-UP只能连接到一个CU-CP，一个DU可以连接到一个CU-CP控制下的多个CU-UP，一个CU-UP可以连接到一个CU-CP控制下的多个DU。
申请人在研究中发现，在CU/DU分离以及CU-CP/CU-UP分离的场景下，UE从一个基站下的DU1切换到DU2，相应的CU-UP会根据CU-CP的命令切换下行Tunnel，这样，在UE接入到DU2的过程中，DU1没有下行数据发送到UE，而DU2由于还未与UE成功连接也不能收发数据，造成较长时间的数据发送中断，最终影响用户的体验。
基于此，本申请实施例提供了一种切换方法及装置，用以在CU-CP/CU-UP分离的场景下，减少在DU切换过程中数据传输的中断时间，提高用户体验。
下面结合附图对本申请的具体实施方式进行说明。
具体地，本申请实施例提供了一种接入网设备，可以包括：CU-CP和CU-UP；
CU-CP，用于为用户设备确定目标DU；然后，向CU-UP发送通知。
CU-UP，用于接收CU-CP发送的通知；然后，根据通知中的隧道转换指示信息，将用户设备的源下行隧道转换为目标DU对应的下行隧道，并根据通知中的保持指示信息，继续通过源下行隧道发送下行数据。
可选地，在本申请实施例中，CU-CP向CU-UP发送的通知，可以采用更新承载(Bearer modification procedure)消息的形式发送；并且，CU-CP向CU-UP发送的通知中，可以包括：隧道转换指示信息和保持指示信息；其中，隧道转换指示信息用于指示CU-UP将用户设备的源下行隧道转换为目标DU对应的下行隧道，保持指示信息用于指示CU-UP继续通过源下行隧道发送下行数据。通过CU-CP发送的通知，可以使得CU-UP根据该通知，转换用户设备的下行隧道，同时还指示CU-UP可以继续通过源下行隧道发送下行数据，以减少在DU切换过程中数据传输的中断时间，以提高用户体验。
需要说明的是，在实际的DU切换过程中，可能会存在以下情况：CU-CP在向CU-UP发送通知的过程中，源下行隧道的无线链路质量(RADIO link quality)还能够满足传输数据的要求，而随着时间的推移，在CU-UP接收到通知后准备按照通知中的保持指示信息执行相应地操作时，源下行隧道的无线链路质量可能同样也满足数据传输的要求，那么此时，CU-UP可以继续通过源下行隧道发送下行数据，以减少因DU切换过程中数据传输的中断时间；若在CU-UP接收到通知后准备按照通知中的保持指示信息执行相应地操作，源下行隧道的无线链路质量已经无法满足数据传输的要求时，那么CU-UP则无法再继续通过源下行隧道发送下行数据。
因此，在CU-UP在接收到通知之后，按照通知中的保持指示信息，CU-UP可以继续向源下行隧道发送下行数据，但具体是否能够发送成功，还与源下行隧道的无线链路质量有关。
可选地，在本申请实施例中，在CU-CP向CU-UP发送的通知中，包括的保持指示信息，可以具体为：暂时保持源下行隧道的指示信息，用于指示CU-UP暂时保持源下行隧道，并继续通过源下行隧道发送下行数据；或者，转换用户设备的下行隧道的原因为小区切换的原因信息，用于指示CU-UP在 因小区切换进行下行隧道转换时，继续通过源下行隧道发送下行数据。
也就是说，CU-CP可以通过两种方式，指示CU-UP可以继续通过源下行隧道发送下行数据；第一种方式为，CU-CP可以通过间接的方式告知CU-UP所要执行的操作，如在保持指示信息中告知CU-UP转换用户设备的下行隧道的原因为小区切换，如此，使得CU-UP在明确了原因了可以继续通过源下行隧道发送下行数据。第二种方式为，CU-CP可以直接在保持指示信息中明确指明CU-UP所要执行的动作，以使CU-UP在接收到保持指示信息后，可以直接执行暂时保持源下行隧道，并可以继续通过源下行隧道发送下行数据的操作，从而加快处理速度。
可选地，在本申请实施例中，在用户设备完成与目标DU的连接后，此时需要CU-UP开始通过目标DU对应的下行隧道发送下行数据，以保证用户设备的通信正常。其中，如何确定出CU-UP开始通过目标DU对应的下行隧道向目标DU发送下行数据的时间，就变得尤为重要。
具体地，在确定CU-UP开始通过目标DU对应的下行隧道向目标DU发送下行数据的时间时，可以采用以下两种实现方式：
第一种实现方式，根据源DU对应的无线链路的质量信息，确定CU-UP开始通过目标DU对应的下行隧道向目标DU发送下行数据的时间。
其中，对于用户面数据，在CU-UP接收到CU-CP发送的通知后，仍然通过源下行隧道发送下行数据时，源DU会继续在用户面向CU-UP发送携带有对应的无线链路的质量信息的检测消息；并且，源DU与源下行隧道是相对应的。
当CU-UP在确定源DU对应的无线链路的质量满足预设条件，若该预设条件为源DU对应的无线链路的质量小于阈值，也就是说，CU-UP发现源下行隧道的无线链路的质量很差，已经无法再继续发送数据时，此时，CU-UP确定可以开始通过目标DU对应的下行隧道向目标DU发送下行数据，而同时停止通过源下行隧道发送下行数据。
当然，本申请实施例上述内容中提及的预设条件并不限于源DU对应的 无线链路的质量小于阈值，还可以是其他条件，在此并不限定。
第二种实现方式，根据目标DU提供的与用户设备的成功连接消息，确定CU-UP开始通过目标DU对应的下行隧道向目标DU发送下行数据的时间。
其中，对于用户面数据，在CU-UP接收到CU-CP发送的通知后，仍然通过源下行隧道发送下行数据时，源DU会继续在用户面向CU-UP发送的携带有对应的无线链路的质量信息的检测消息；并且，源DU与源下行隧道是相对应的。
但在此实现方式中，并不是根据源下行隧道的无线链路的质量，而确定开始通过目标DU对应的下行隧道向目标DU发送下行数据的时间的，所以虽然CU-UP会接收到源DU在用户面发送的检测信息，也不会对该检测信息进行响应。
此外，在用户设备与目标DU成功连接时，目标DU可以向CU-UP发送连接成功消息，以通知CU-UP自身已经与用户设备完成连接，可以进行数据传输；因此，此时CU-UP则可以开始通过目标DU对应的下行隧道向目标DU发送下行数据，同时停止通过源下行隧道发送下行数据。
在具体实施时，为了能够为用户设备确定出目标DU，在本申请实施例中，在CU-CP为用户设备确定目标DU时，可以采用以下过程：
步骤一，用户设备向CU-CP发送切换请求消息。
其中，该切换请求消息中携带有源DU的相关信息，如源DU的标识，源DU对应的下行隧道编号等；并且，该切换请求消息中还携带有周边小区的无线链路的质量信息，也就是说，用户设备会对周边小区的无线链路质量进行测量，然后将测量结果汇总后发送给CU-CP，以便于CU-CP确定目标DU。
步骤二、CU-CP根据切换请求，选择出符合条件的目标小区，并向待定DU发送用户上下文建立请求(UE context setup请求)。
其中，符合条件的目标小区，可以理解为：目标小区的无线链路的质量较好，可以提高优质的业务服务。并且在一个基站中包括多个小区，一个小区对应一个DU，所以在选择出目标小区之后，即可选择出目标小区对应的 DU，此处将目标小区对应的DU称之为待定DU。
步骤三、待定DU在根据UE context setup请求，确定能够为用户设备提供资源时，向CU-CP发送反馈消息。
其中，若待定DU已经无法为用户设备提供资源和业务服务时，说明待定DU并不是目标DU，所以CU-CP需要重新待定DU，即继续重复步骤二；若待定DU可以为用户设备提供资源和服务时，则可以确定待定DU即为目标DU。
并且，待定DU确定能够为用户设备提供资源的方式可以为建立用户设备的上下文，若成功建立则说明能够为用户设备提供资源。
步骤四、CU-CP在接收到反馈消息后，确定该待定DU即为目标DU。
在具体实施时，在本申请实施例中，在CU-UP根据通知中的隧道转换指示信息转换用户设备的下行隧道，且根据通知中的保持指示信息可以继续通过源下行隧道发送下行数据之后，需要进行用户设备与目标DU的连接过程，具体可以采用以下过程：
步骤一、CU-CP向源DU发送用户上下文更新请求(UE context modification request)消息。
其中，UE context modification request消息中携带有无线资源控制容器(RRC container)。
步骤二、源DU向用户设备发送无线资源控制重建(RRC reconfiguration)消息。
步骤三、用户设备向目标DU发送随机接入过程。
其中，可以通过随机接入信道(Radom Access Channel,RACH)来完成随机接入。
步骤四、用户设备完成接入过程，并向目标DU发送无线资源控制重建完成(RRC reconfiguration complete)消息，完成与目标DU的连接。
需要说明的是，在本申请实施例中，在CU-UP根据通知中的隧道转换指示信息转换用户设备的下行隧道，且根据通知中的保持指示信息可以继续通 过源下行隧道发送下行数据之后，用户设备与目标DU进行的连接过程，具体可以参见目前技术中的连接过程，具体不再赘述。
基于同一构思，本申请实施例提供了一种切换方法，应用于CU-CP一侧，如图3所示，该切换方法可以包括：
S301、中心节点控制面CU-CP为用户设备确定目标DU；
其中，在CU-CP为用户设备确定目标DU，可以根据用户设备向CU-CP提供的对周边小区的无线链路的质量的测量结果来确定，具体可参见上述内容，重复之处不再赘述。
S302、中心节点控制面CU-CP向中心节点用户面CU-UP发送通知；其中，通知包括：隧道转换指示信息和保持指示信息，隧道转换指示信息用于指示中心节点用户面CU-UP将用户设备的源下行隧道转换为目标DU对应的下行隧道，保持指示信息用于指示中心节点用户面CU-UP继续通过源下行隧道发送下行数据。
此外，对于用户设备如何与目标DU的连接过程，可以参见上述内容，重复之处不再赘述。
通过该方法，使得CU-CP向CU-UP发送的通知中不仅携带有隧道转换指示信息，还包括保持指示信息，通过隧道转换指示信息，可以指示CU-UP将用户设备的源下行隧道转换为目标DU对应的下行隧道，以便于在用户设备成功与目标DU连接之后，用户设备可以接收到目标DU发送的下行数据；通过保持指示信息，指示CU-UP可以继续通过源下行隧道发送下行数据，使得用户设备在与目标DU未连接时，还可以接收到下行数据，从而减少在DU切换过程中数据传输的中断时间，提高用户体验。
可选地，保持指示信息可以包括：暂时保持源下行隧道的指示信息，用于指示CU-UP暂时保持源下行隧道，并继续通过源下行隧道发送下行数据；或，转换用户设备的下行隧道的原因为小区切换的原因信息，用于指示CU-UP在因小区切换进行下行隧道转换时，继续通过源下行隧道发送下行数据。
从而，在设置保持指示信息的内容时，并不限于只是暂时保持源下行隧 道的指示信息，还可以是切换用户设备的下行隧道的原因信息，使得CU-UP可以继续通过源下行隧道发送下行数据，增加保持指示信息设置的灵活性。
基于同一构思，本申请实施例提供了一种切换方法，应用于CU-UP一侧，如图4所示，该切换方法可以包括：
S401、中心节点用户面CU-UP接收中心节点控制面CU-CP发送的通知；
其中，通知可以包括：隧道转换指示信息和保持指示信息，隧道转换指示信息用于指示CU-UP将用户设备的源下行隧道转换为目标DU对应的下行隧道，保持指示信息用于指示CU-UP继续通过源下行隧道发送下行数据；
S402、中心节点用户面CU-UP根据通知中的隧道转换指示信息，将用户设备的源下行隧道转换为目标DU对应的下行隧道，并根据通知中的保持指示信息，继续通过源下行隧道发送下行数据。
通过该方法，使得CU-CP向CU-UP发送的通知中不仅携带有隧道转换指示信息，还包括保持指示信息，通过隧道转换指示信息，可以指示CU-UP将用户设备的源下行隧道转换为目标DU对应的下行隧道，以便于在用户设备成功与目标DU连接之后，用户设备可以接收到目标DU发送的下行数据；通过保持指示信息，指示CU-UP可以继续通过源下行隧道发送下行数据，使得用户设备在与目标DU未连接时，还可以接收到下行数据，从而减少在DU切换过程中数据传输的中断时间，提高用户体验。
可选地，在本申请实施例中的上述步骤S402之后，还可以包括：
CU-UP确定开始通过目标DU对应的下行隧道向目标DU发送下行数据的时间。
从而，可以确定出CU-UP何时向目标DU发送下行数据。
可选地，在本申请实施例中，CU-UP确定开始通过目标DU对应的下行隧道向目标DU发送下行数据的时间，可以具体包括：
CU-UP接收源DU发送的携带有对应的无线链路的质量信息的检测消息；其中，源DU与源下行隧道相对应；
CU-UP在确定源DU对应的无线链路的质量满足预设条件时，CU-UP停 止通过源下行隧道发送下行数据，开始通过目标DU对应的下行隧道向目标DU发送下行数据。
在上述步骤S402之后，由于源DU继续在用户面向CU-UP发送携带有对应的无线链路的质量信息的检测信息，使得CU-UP可以获知源下行隧道的无线链路的质量状况，在无线链路的质量不能满足预设条件时，CU-UP则可以停止通过源下行隧道继续发送下行数据，而是通过目标DU对应的下行隧道发送下行数据，以减少DU切换过程中数据传输的中断时间。
具体地，在申请实施例中，预设条件可以设置为：源DU对应的无线链路的质量小于阈值，但不限于此；并且，该阈值可以根据实际情况进行设定，以满足各种应用场景的需求。
可选地，在申请实施例中，CU-UP确定开始通过目标DU对应的下行隧道向目标DU发送下行数据的时间，可以具体包括：
CU-UP在接收到目标DU发送的连接成功消息时，CU-UP停止通过源下行隧道发送下行数据，开始通过目标DU对应的下行隧道向目标DU发送下行数据。
在用户设备与目标DU成功连接之后，目标DU可以向CU-UP发送连接成功消息，所以CU-UP可以在接收到该连接成功消息时，即可停止通过源下行隧道发送数据，而是通过目标DU对应的下行隧道发送下行数据，减少DU切换过程中数据传输的中断时间。
下面结合具体实施例，对本申请实施例提供的上述切换方法进行说明。
实施例一：结合图5所示的交互流程图，以根据源DU对应的无线链路的质量信息，确定CU-UP开始通过目标DU对应的下行隧道向目标DU发送下行数据的时间为例进行说明。
S501、UE向CU-CP提供对周边小区的无线链路质量(RADIO link quality)的测量结果；
S502、CU-CP根据测量结果选择合适的目标DU，并且目标DU发送UE context setup请求，以使目标DU建立UE的上下文；
S503、CU-CP向CU-UP发送bearer modification procedure消息；
S504、CU-UP更新UE的下行隧道，同时可以继续向源DU发送下行数据；
S505、源DU向CU-UP发送RADIO link quality消息；
S506、CU-CP向源DU发送携带RRC container的UE context modification request消息；
S507、源DU向UE发送RRC reconfiguration消息；
S508、UE向目标DU发起随机接入过程；
S509、UE完成接入过程，并向目标DU发送RRC reconfiguration complete消息；
S510、当源DU对应的无线链路质量较差时，CU-CP开始通过目标DU对应的下行隧道向目标DU发送下行数据。
实施例二：结合图6所示的交互流程图，以根据目标DU提供的与用户设备的成功连接消息，确定CU-UP开始通过目标DU对应的下行隧道向目标DU发送下行数据的时间为例进行说明。
S601、UE向CU-CP提供对周边小区的无线链路质量(RADIO link quality)的测量结果；
S602、CU-CP根据测量结果选择合适的目标DU，并且目标DU发送UE context setup请求，以使目标DU建立UE的上下文；
S603、CU-CP向CU-UP发送bearer modification procedure消息；
S604、CU-UP更新UE的下行隧道，同时可以继续向源DU发送下行数据；
S605、源DU向CU-UP发送RADIO link quality消息；
S606、CU-CP向源DU发送携带RRC container的UE context modification request消息；
S607、源DU向UE发送RRC reconfiguration消息；
S608、UE向目标DU发起随机接入过程；
S609、目标DU确定UE成功接入后，向CU-UP发送连接成功消息；
S610、CU-CP开始通过目标DU对应的下行隧道向目标DU发送下行数据；
S611、UE向目标DU发送RRC reconfiguration complete消息。
基于同一构思，本申请实施例还提供了一种切换装置，如CU-CP，如图7所示，切换装置可以包括：
确定单元701，用于中心节点控制层CU-CP为用户设备确定目标分布式节点DU；
发送单元702，用于CU-CP向中心节点用户层CU-UP发送通知；其中，通知包括：隧道转换指示信息和保持指示信息，隧道转换指示信息用于指示CU-UP将用户设备的源下行隧道转换为目标DU对应的下行隧道，保持指示信息用于指示CU-UP继续通过源下行隧道发送下行数据。
可选地，在本申请实施例中，保持指示信息包括：暂时保持源下行隧道的指示信息，用于指示CU-UP暂时保持源下行隧道，并继续通过源下行隧道发送下行数据；或，转换用户设备的下行隧道的原因为小区切换的原因信息，用于指示CU-UP在因小区切换进行下行隧道转换时，继续通过源下行隧道发送下行数据。
基于同一构思，本申请实施例还提供了一种通信装置，如CU-CP，如图8所示，包括：
存储器801，用于存储程序指令；
处理器802，用于调用存储器中存储的程序指令，按照获得的程序执行：
为用户设备确定目标DU；
向CU-UP发送通知；其中，通知包括：隧道转换指示信息和保持指示信息，隧道转换指示信息用于指示CU-UP将用户设备的源下行隧道转换为目标DU对应的下行隧道，保持指示信息用于指示CU-UP继续通过源下行隧道发送下行数据。
可选地，在本申请实施例中，保持指示信息包括：暂时保持源下行隧道 的指示信息，用于指示CU-UP暂时保持源下行隧道，并继续通过源下行隧道发送下行数据；或，转换用户设备的下行隧道的原因为小区切换的原因信息，用于指示CU-UP在因小区切换进行下行隧道转换时，继续通过源下行隧道发送下行数据。
可选地，在本申请实施例中，切换装置还可以包括网络接口803，该网络接口803可以用于在处理器802的控制下收发数据。
其中，在图8中，总线架构可以包括任意数量的互联的总线和桥，具体由处理器802代表的一个或多个处理器和存储器801代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口提供接口。网络接口803可以是多个元件，即包括发送机和接收机，提供用于在传输介质上与各种其他装置通信的单元。针对不同的用户设备，用户接口还可以是能够外接内接需要设备的接口，连接的设备包括但不限于小键盘、显示器、扬声器、麦克风、操纵杆等。
处理器802负责管理总线架构和通常的处理，存储器801可以存储处理器802在执行操作时所使用的数据。
本申请实施例中的处理器802，可以是中央处埋器(CPU)、专用集成电路(Application Specific Integrated Circuit，ASIC)、现场可编程门阵列(Field－Programmable Gate Array，FPGA)或复杂可编程逻辑器件(Complex Programmable Logic Device，CPLD)。
基于同一构思，，本申请实施例还提供了一种切换装置，如CU-UP，如图9所示，切换装置可以包括：
接收单元901，用于中心节点用户层CU-UP接收中心节点控制层CU-CP发送的通知；其中，通知包括：隧道转换指示信息和保持指示信息，隧道转换指示信息用于指示CU-UP将用户设备的源下行隧道转换为目标DU对应的下行隧道，保持指示信息用于指示CU-UP继续通过源下行隧道发送下行数据；
转换单元902，用于CU-UP根据通知中的隧道转换指示信息，将用户设 备的源下行隧道转换为目标DU对应的下行隧道；
保持单元903，用于CU-UP根据通知中的保持指示信息，继续通过源下行隧道发送下行数据。
可选地，在本申请实施例中，如图9所示，还可以包括：
确定单元904，用于CU-UP确定开始通过目标DU对应的下行隧道向目标DU发送下行数据的时间。
可选地，在本申请实施例中，确定单元904，具体用于CU-UP接收源DU发送的携带有对应的无线链路的质量信息的检测消息；其中，源DU与源下行隧道相对应；CU-UP在确定源DU对应的无线链路的质量满足预设条件时，CU-UP停止通过源下行隧道发送下行数据，开始通过目标DU对应的下行隧道向目标DU发送下行数据。
可选地，在本申请实施例中，确定单元904，具体用于CU-UP在接收到目标DU发送的连接成功消息时，CU-UP停止通过源下行隧道发送下行数据，开始通过目标DU对应的下行隧道向目标DU发送下行数据。
基于同一构思，本申请实施例还提供了一种通信装置，如图10所示，可以包括：
存储器1001，用于存储程序指令；
处理器1002，用于调用存储器中存储的程序指令，按照获得的程序执行：
接收中心节点控制层CU-CP发送的通知；其中，通知包括：隧道转换指示信息和保持指示信息，隧道转换指示信息用于指示中心节点用户层CU-UP将用户设备的源下行隧道转换为目标DU对应的下行隧道，保持指示信息用于指示CU-UP继续通过源下行隧道发送下行数据；
根据通知中的隧道转换指示信息，将用户设备的源下行隧道转换为目标DU对应的下行隧道，并根据通知中的保持指示信息，继续通过源下行隧道发送下行数据。
可选的，所述处理器还用于：
所述CU-UP确定开始通过所述目标DU对应的下行隧道向所述目标DU 发送下行数据的时间。
可选的，所述处理器，具体用于所述CU-UP接收源DU发送的携带有对应的无线链路的质量信息的检测消息；其中，所述源DU与所述源下行隧道相对应；所述CU-UP在确定所述源DU对应的无线链路的质量满足预设条件时，所述CU-UP停止通过所述源下行隧道发送下行数据，开始通过所述目标DU对应的下行隧道向所述目标DU发送下行数据。
可选的，所述处理器，具体用于所述CU-UP在接收到所述目标DU发送的连接成功消息时，所述CU-UP停止通过所述源下行隧道发送下行数据，开始通过所述目标DU对应的下行隧道向所述目标DU发送下行数据。
可选的，所述保持指示信息包括：暂时保持所述源下行隧道的指示信息，用于指示所述CU-UP暂时保持所述源下行隧道，并继续通过所述源下行隧道发送下行数据；或，转换所述用户设备的下行隧道的原因为小区切换的原因信息，用于指示所述CU-UP在因小区切换进行下行隧道转换时，继续通过所述源下行隧道发送下行数据。
可选地，在本申请实施例中，切换装置还可以包括网络接口1003，该网络接口1003可以用于在处理器1002的控制下收发数据。
其中，在图10中，总线架构可以包括任意数量的互联的总线和桥，具体由处理器1002代表的一个或多个处理器和存储器1001代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口提供接口。网络接口1003可以是多个元件，即包括发送机和接收机，提供用于在传输介质上与各种其他装置通信的单元。针对不同的用户设备，用户接口还可以是能够外接内接需要设备的接口，连接的设备包括但不限于小键盘、显示器、扬声器、麦克风、操纵杆等。
处理器1002负责管理总线架构和通常的处理，存储器1001可以存储处理器1002在执行操作时所使用的数据。
本申请实施例中的处理器1002，可以是中央处埋器(CPU)、专用集成电 路(Application Specific Integrated Circuit，ASIC)、现场可编程门阵列(Field－Programmable Gate Array，FPGA)或复杂可编程逻辑器件(Complex Programmable Logic Device，CPLD)。
需要指出的是，本申请实施例中提及的任意存储器可以包括只读存储器(ROM)和随机存取存储器(RAM)，并向处理器提供存储器中存储的程序指令和数据。在本申请实施例中，存储器可以用于存储本申请实施例提供的任一方法的程序。处理器通过调用存储器存储的程序指令，处理器用于按照获得的程序指令执行本申请实施例提供的任一方法。
基于同一构思，本申请实施例还提供了一种计算机可读存储介质，计算机可读存储介质存储有计算机可执行指令，计算机可执行指令用于使计算机执行上述任一种方法。
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数据存储设备，包括但不限于磁性存储器(例如软盘、硬盘、磁带、磁光盘(MO)等)、光学存储器(例如光盘(CD)、数字通用光盘(DVD)、蓝光盘(BD)、高清通用光盘(HVD)等)、以及半导体存储器(例如ROM、可擦除可编程只读存储器(EPROM)、带电可擦写可编程读写存储器(EEPROM)、非易失性存储器(NAND FLASH)、固态硬盘(SSD))等。
需要说明的是，本申请实施例中提及的用户设备，也可称之为终端、移动台(Mobile Station，简称为“MS”)、移动终端(Mobile Terminal)等，可选的，该终端可以具备经无线接入网(Radio Access Network，RAN)与一个或多个核心网进行通信的能力，例如，终端可以是移动电话(或称为“蜂窝”电话)、或具有移动性质的计算机等，例如，终端还可以是便携式、袖珍式、手持式、计算机内置的或者车载的移动装置。
接入网设备可以为基站(例如，接入点)，指接入网中在空中接口上通过一个或多个扇区与无线终端通信的设备。基站可用于将收到的空中帧与网际协议IP分组进行相互转换，作为无线终端与接入网的其余部分之间的路由器，其中接入网的其余部分可包括网际协议(IP)网络。基站还可协调对空中接口 的属性管理。例如，基站可以是全球移动通信系统(Global System for Mobile communications，GSM)或码分多址CDMA中的基站(BTS，Base Transceiver Station)，也可以是宽带码分多址WCDMA中的基站(NodeB)，还可以是LTE中的演进型基站(NodeB或基站(eNB)或基站(e-NodeB，evolutional Node B))，本方面实施例中不做限定。
上述方法处理流程可以用软件程序实现，该软件程序可以存储在存储介质中，当存储的软件程序被调用时，执行上述方法步骤。
本领域内的技术人员应明白，本申请的实施例可提供为方法、系统、或计算机程序产品。因此，本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器和光学存储器等)上实施的计算机程序产品的形式。
本申请是参照根据本申请实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在计算机可读存储器中的指令产生包括指令装置的制造品，指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图 一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
尽管已描述了本申请的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例作出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本申请范围的所有变更和修改。
本申请实施例提供了一种切换方法及装置，通过该方法，使得CU-CP向CU-UP发送的通知中不仅携带有隧道转换指示信息，还包括保持指示信息，通过隧道转换指示信息，可以指示CU-UP将用户设备的源下行隧道转换为目标DU对应的下行隧道，以便于在用户设备成功与目标DU连接之后，用户设备可以接收到目标DU发送的下行数据；通过保持指示信息，指示CU-UP可以继续通过源下行隧道发送下行数据，使得用户设备在与目标DU未连接时，还可以接收到下行数据，从而减少在DU切换过程中数据传输的中断时间，提高用户体验。
显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (17)

  1. 一种切换方法，其特征在于，应用于中心节点CU和分布式节点DU分离的接入网设备，所述CU包括中心节点控制层CU-CP和中心节点用户层CU-UP，所述方法包括：
    所述CU-CP为用户设备确定目标DU；
    所述CU-CP向CU-UP发送通知；其中，所述通知包括：隧道转换指示信息和保持指示信息，所述隧道转换指示信息用于指示所述CU-UP将所述用户设备的源下行隧道转换为所述目标DU对应的下行隧道，所述保持指示信息用于指示所述CU-UP继续通过所述源下行隧道发送下行数据。
  2. 如权利要求1所述的方法，其特征在于，所述保持指示信息包括：暂时保持所述源下行隧道的指示信息，用于指示所述CU-UP暂时保持所述源下行隧道，并继续通过所述源下行隧道发送下行数据；或，转换所述用户设备的下行隧道的原因为小区切换的原因信息，用于指示所述CU-UP在因小区切换进行下行隧道转换时，继续通过所述源下行隧道发送下行数据。
  3. 一种切换方法，其特征在于，包括：
    中心节点用户层CU-UP接收中心节点控制层CU-CP发送的通知；其中，所述通知包括：隧道转换指示信息和保持指示信息，所述隧道转换指示信息用于指示所述CU-UP将所述用户设备的源下行隧道转换为目标分布式节点DU对应的下行隧道，所述保持指示信息用于指示所述CU-UP继续通过所述源下行隧道发送下行数据；
    所述CU-UP根据所述通知中的隧道转换指示信息，将所述用户设备的源下行隧道转换为所述目标DU对应的下行隧道，并根据所述通知中的保持指示信息，继续通过所述源下行隧道发送下行数据。
  4. 如权利要求3所述的方法，其特征在于，还包括：
    所述CU-UP确定开始通过所述目标DU对应的下行隧道向所述目标DU发送下行数据的时间。
  5. 如权利要求4所述的方法，其特征在于，所述CU-UP确定开始通过所述目标DU对应的下行隧道向所述目标DU发送下行数据的时间，具体包括：
    所述CU-UP接收源DU发送的携带有对应的无线链路的质量信息的检测消息；其中，所述源DU与所述源下行隧道相对应；
    所述CU-UP在确定所述源DU对应的无线链路的质量满足预设条件时，所述CU-UP停止通过所述源下行隧道发送下行数据，开始通过所述目标DU对应的下行隧道向所述目标DU发送下行数据。
  6. 如权利要求4所述的方法，其特征在于，所述CU-UP确定开始通过所述目标DU对应的下行隧道向所述目标DU发送下行数据的时间，具体包括：
    所述CU-UP在接收到所述目标DU发送的连接成功消息时，所述CU-UP停止通过所述源下行隧道发送下行数据，开始通过所述目标DU对应的下行隧道向所述目标DU发送下行数据。
  7. 如权利要求3-6任一项所述的方法，其特征在于，所述保持指示信息包括：暂时保持所述源下行隧道的指示信息，用于指示所述CU-UP暂时保持所述源下行隧道，并继续通过所述源下行隧道发送下行数据；或，转换所述用户设备的下行隧道的原因为小区切换的原因信息，用于指示所述CU-UP在因小区切换进行下行隧道转换时，继续通过所述源下行隧道发送下行数据。
  8. 一种通信装置，其特征在于，包括：
    存储器，用于存储程序指令；
    处理器，用于调用所述存储器中存储的程序指令，按照获得的程序执行：
    为用户设备确定目标分布式节点DU；
    向中心节点用户层CU-UP发送通知；其中，所述通知包括：隧道转换指示信息和保持指示信息，所述隧道转换指示信息用于指示所述CU-UP将所述用户设备的源下行隧道转换为所述目标DU对应的下行隧道，所述保持指示信息用于指示所述CU-UP继续通过所述源下行隧道发送下行数据。
  9. 如权利要求8所述的装置，其特征在于，所述保持指示信息包括：暂时保持所述源下行隧道的指示信息，用于指示所述CU-UP暂时保持所述源下 行隧道，并继续通过所述源下行隧道发送下行数据；或，转换所述用户设备的下行隧道的原因为小区切换的原因信息，用于指示所述CU-UP在因小区切换进行下行隧道转换时，继续通过所述源下行隧道发送下行数据。
  10. 一种通信装置，其特征在于，包括：
    存储器，用于存储程序指令；
    处理器，用于调用所述存储器中存储的程序指令，按照获得的程序执行：
    接收中心节点控制层CU-CP发送的通知；其中，所述通知包括：隧道转换指示信息和保持指示信息，所述隧道转换指示信息用于指示所述中心节点用户层CU-UP将所述用户设备的源下行隧道转换为目标分布式节点DU对应的下行隧道，所述保持指示信息用于指示所述CU-UP继续通过所述源下行隧道发送下行数据；
    根据所述通知中的隧道转换指示信息，将所述用户设备的源下行隧道转换为所述目标DU对应的下行隧道，并根据所述通知中的保持指示信息，继续通过所述源下行隧道发送下行数据。
  11. 如权利要求10所述的装置，其特征在于，所述处理器还用于：
    所述CU-UP确定开始通过所述目标DU对应的下行隧道向所述目标DU发送下行数据的时间。
  12. 如权利要求11所述的装置，其特征在于，所述处理器，具体用于所述CU-UP接收源DU发送的携带有对应的无线链路的质量信息的检测消息；其中，所述源DU与所述源下行隧道相对应；所述CU-UP在确定所述源DU对应的无线链路的质量满足预设条件时，所述CU-UP停止通过所述源下行隧道发送下行数据，开始通过所述目标DU对应的下行隧道向所述目标DU发送下行数据。
  13. 如权利要求11所述的装置，其特征在于，所述处理器，具体用于所述CU-UP在接收到所述目标DU发送的连接成功消息时，所述CU-UP停止通过所述源下行隧道发送下行数据，开始通过所述目标DU对应的下行隧道向所述目标DU发送下行数据。
  14. 如权利要求10-13任一项所述的装置，其特征在于，所述保持指示信息包括：暂时保持所述源下行隧道的指示信息，用于指示所述CU-UP暂时保持所述源下行隧道，并继续通过所述源下行隧道发送下行数据；或，转换所述用户设备的下行隧道的原因为小区切换的原因信息，用于指示所述CU-UP在因小区切换进行下行隧道转换时，继续通过所述源下行隧道发送下行数据。
  15. 一种切换装置，其特征在于，包括：
    确定单元，用于所述中心节点控制层CU-CP为用户设备确定目标分布式节点DU；
    发送单元，用于所述CU-CP向中心节点用户层CU-UP发送通知；其中，所述通知包括：隧道转换指示信息和保持指示信息，所述隧道转换指示信息用于指示所述CU-UP将所述用户设备的源下行隧道转换为所述目标DU对应的下行隧道，所述保持指示信息用于指示所述CU-UP继续通过所述源下行隧道发送下行数据。
  16. 一种切换装置，其特征在于，包括：
    接收单元，用于中心节点用户层CU-UP接收中心节点控制层CU-CP发送的通知；其中，所述通知包括：隧道转换指示信息和保持指示信息，所述隧道转换指示信息用于指示所述CU-UP将所述用户设备的源下行隧道转换为目标分布式节点DU对应的下行隧道，所述保持指示信息用于指示所述CU-UP继续通过所述源下行隧道发送下行数据；
    转换单元，用于所述CU-UP根据所述通知中的隧道转换指示信息，将所述用户设备的源下行隧道转换为所述目标DU对应的下行隧道；
    保持单元，用于所述CU-UP根据所述通知中的保持指示信息，继续通过所述源下行隧道发送下行数据。
  17. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质存储有计算机可执行指令，所述计算机可执行指令用于使所述计算机执行权利要求1至7任一项所述的方法。
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EP3817451A1 (en) 2021-05-05
CN110650502B (zh) 2021-04-09
US20210144594A1 (en) 2021-05-13
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JP7213898B2 (ja) 2023-01-27
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