CN114585034A - DAPS switching method, network equipment and user equipment - Google Patents

DAPS switching method, network equipment and user equipment Download PDF

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Publication number
CN114585034A
CN114585034A CN202210483677.XA CN202210483677A CN114585034A CN 114585034 A CN114585034 A CN 114585034A CN 202210483677 A CN202210483677 A CN 202210483677A CN 114585034 A CN114585034 A CN 114585034A
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China
Prior art keywords
base station
message
rrc reconfiguration
target base
downlink
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Chinese (zh)
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王贻先
邵世才
颜志凌
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Wuhan Shiju Information Technology Co ltd
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Wuhan Shiju Information Technology Co ltd
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    • 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
    • H04W36/08—Reselecting an access point
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The invention relates to a DAPS switching method, network equipment and user equipment, and belongs to the technical field of wireless communication. The method comprises the following steps: the source base station receives an RRC reconfiguration completion message; responding to the RRC reconfiguration completion message, sending an SN state transmission message to the target base station based on an Xn interface, or sending an uplink RAN state transmission message to a 5GC based on an Ng interface, indicating that forwarding of uplink and downlink data SN information is completed, indicating the target base station to downlink a next PDCP SN, indicating an uplink first lost PDCP SDU, and receiving the RRC reconfiguration completion message and the SN state transmission message/downlink RAN state transmission message by the target base station; responding to the RRC reconfiguration completion message and the SN state transmission message/downlink RAN state transmission message, sending a path switching request to the 5GC, and triggering path switching.

Description

DAPS switching method, network equipment and user equipment
Technical Field
The invention relates to a DAPS switching method, network equipment and user equipment, and belongs to the technical field of wireless communication.
Background
Conventional 4G LTE (long term evolution) networks and 5G NR (new radio) networks up to release R15, a UE (user equipment) typically releases a connection from a source cell before establishing a connection with a target cell. Therefore, UL (uplink) and DL (downlink) transmissions are completed in the source cell before the UE starts communicating with the target cell, resulting in a communication interruption between the UE and the base station of several tens of milliseconds. Such interruption is a very critical issue for URLCC (ultra reliable low latency communication) scenarios using 5G.
The DAPS handover is a dual active protocol stack handover proposed by the 3GPP R16 release. In the whole switching process, the UE keeps normal data receiving and sending functions in the source cell and does not release the communication connection with the source cell when the UE receives the switching command. When the UE can send and receive user data in the target cell, the target cell explicitly indicates the UE to release the source cell connection, otherwise, the UE keeps the source cell communication connection. The problem of data interruption in the switching process caused by the prior art can be effectively solved through DAPS switching, and the wide development of URLLC service scenes is realized.
Disclosure of Invention
The invention aims to overcome the defects of the existing DAPS switching and provides a switching method for canceling the message for informing the source base station of completing the switching by the target base station, thereby reducing the time delay of a control plane, gradually reducing the types of the messages and reducing the complexity of the process.
The invention is realized by adopting the following technical scheme:
in a first aspect, a DAPS handover method is provided, where handover is based on an Xn interface, and includes: the source base station receives an RRC reconfiguration completion message; and responding to the RRC reconfiguration completion message, sending an SN state transmission message to the target base station based on the Xn interface, indicating that the forwarding of the SN information of the uplink and downlink data is completed, and indicating the downlink next PDCP SN of the target base station and indicating the uplink first lost PDCP SDU by the source base station.
With reference to the first aspect, in a first possible implementation manner of the first aspect, the method further includes: the target base station receives the RRC reconfiguration completion message and the SN state transmission message; and sending a path switching request to the 5GC in response to the RRC reconfiguration complete message and the SN state transmission message, and triggering path switching.
With reference to the first aspect and the foregoing implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the handover method further includes: after receiving the RRC reconfiguration complete message, the destination base station indicates that the UE and the base station have completed synchronization and completed random access, and the destination base station starts downlink buffer data transmission and transmits downlink forwarding data to the UE.
With reference to the first aspect and the foregoing implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the handover method further includes: and the target base station discards SDU with SN less than the numerical value in the message according to the indication of the SN state transmission message, distributes the next PDCP SN, and sends uplink data to the 5 GC.
In a second aspect, a DAPS handover method is provided, where handover is based on an Ng interface, and the method includes: the source base station receives an RRC reconfiguration completion message; and responding to the RRC reconfiguration complete message, and sending an uplink RAN state transmission message to the 5GC based on the Ng interface, wherein the uplink RAN state transmission message indicates that the forwarding of the uplink and downlink data SN information is completed. And the source base station indicates the target base station to downlink the next PDCP SN and indicates the uplink first lost PDCP SDU.
With reference to the second aspect, in a first possible implementation manner of the second aspect, the method further includes: the switching method further comprises the following steps: the target base station receives an RRC reconfiguration completion message and a downlink RAN state transmission message; and responding to the RRC reconfiguration complete message and the downlink RAN state transmission message, sending a switching notification to the 5GC, and triggering the path switching.
With reference to the second aspect and the foregoing implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the handover method further includes: after receiving the RRC reconfiguration complete message, the destination base station indicates that the UE and the base station have completed synchronization and completed random access, and the destination base station starts downlink buffer data transmission and transmits downlink forwarding data to the UE.
With reference to the second aspect and the foregoing implementation manner of the second aspect, in a third possible implementation manner of the second aspect, the handover method further includes: and the target base station discards SDU with SN less than the numerical value in the message according to the indication of the downlink RAN state transmission message, distributes the next PDCP SN, and sends uplink data to the 5 GC.
In a third aspect, a user equipment is provided, the user equipment comprising a transceiver; and a controller configured to:
and after receiving the switching command issued by the base station, the UE completes the establishment of the related DAPS according to the DAPS configuration.
And simultaneously, the UE starts to synchronize to the target base station, initiates a random access process, and sends an RRC reconfiguration completion message to the target base station after the random access is completed. And after receiving the RRC reconfiguration completion feedback confirmation of the target base station, the UE sends an RRC reconfiguration completion message to the source base station.
And in the fourth aspect, a source base station in DAPS handover is provided, configured to receive an RRC reconfiguration complete message and send an SN status transmission message to a target base station based on an Xn interface in response to the RRC reconfiguration complete message, or send an uplink RAN status transmission message to a 5GC based on an Ng interface, to indicate that forwarding of uplink and downlink data SN information has been completed.
In a fifth aspect, a target base station in DAPS handover is provided, configured to receive an RRC reconfiguration complete message and an SN status transmission message; responding to the RRC reconfiguration completion message and the SN state transmission message, sending a path switching request to the 5GC, and triggering path switching; or receiving an RRC reconfiguration complete message and a downlink RAN state transmission message; and sending a switching notification to the 5GC in response to the RRC reconfiguration complete message and the downlink RAN state transmission message, wherein the switching notification indicates that the switching is completed.
The invention adds an RRC reconfiguration complete message sent to the source cell for informing the source cell of the completion of the switching of the target cell after the UE confirms that the target cell receives the switching RRC reconfiguration complete message, and cancels the message for informing the source base station of the completion of the switching by the target base station when the RRC reconfiguration complete message is added, thereby reducing the time delay of a control plane, reducing the types of messages and reducing the complexity of the process.
In addition, by adjusting the DAPS switching process based on the Ng, the sequence of the RAN state transmission messages is advanced, and compared with the technology enjoyed, the target base station realizes earlier uplink data forwarding aiming at the UE/5GC, so that the process of switching based on the Ng can effectively reduce the data plane time delay caused by the uplink data forwarding.
Drawings
Fig. 1 is a schematic diagram of a DAPS handover procedure based on an Xn interface according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a procedure of DAPS handover based on an Ng interface according to an embodiment of the present invention;
fig. 3 is a flow chart of DAPS handover based on an Xn interface in the prior art;
fig. 4 is a flowchart of a DAPS handover based on an Ng interface according to an embodiment of the present invention;
fig. 5 is a flow chart of DAPS handover based on an Xn interface in the prior art;
fig. 6 is a flowchart of a DAPS handover based on an Ng interface according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. In order to better understand the scheme of the embodiments of the present application, the following first introduces the related terms and concepts that may be involved in the embodiments of the present application.
Taking an Xn interface switching process as an example, the whole switching process is divided into the following three stages:
(1) preparing for switching: including measurement control and reporting, handover requests and acknowledgements.
(2) And (3) switching execution: the user equipment immediately executes the switching process after receiving the switching command, namely the user equipment disconnects the source base station and is connected with the target base station (for example, random access is executed, and an RRC switching completion message is sent to the target base station and the like); SN state transfer, data forwarding.
(3) And (3) completing the switching: the target base station performs path switching with an access and mobility management function AMF and a user plane function UPF, and releases the UE context of the source base station.
As shown in fig. 1, an embodiment of the present invention provides a DAPS handover method based on an Xn interface, including:
step 101: and after receiving the switching command issued by the base station, the UE completes the establishment of the related DAPS according to the DAPS configuration.
And simultaneously, the UE starts to synchronize to the target base station, initiates a random access process, and sends an RRC reconfiguration completion message to the target base station after the random access is completed.
And after receiving the feedback confirmation of the RRC reconfiguration complete message of the target base station, the UE sends the RRC reconfiguration complete message to the source base station.
The existing DAPS switching method needs to wait for UE to finish the random access process of a target cell, and after reporting an RRC reconfiguration completion message to the target cell, the target cell informs a source cell of the completion of switching through a switching success message. This process is a serial process, which increases the control plane signaling delay. In this embodiment, the UE directly notifies the source base station through the air interface, so as to reduce the time delay for switching the control plane.
Further, the method further comprises: the target base station receives the RRC reconfiguration complete message to indicate that the UE and the base station complete synchronization and random access, starts downlink cache data transmission and transmits downlink forwarding data to the UE.
Step 102: and the source base station receives the RRC reconfiguration complete message, responds to the RRC reconfiguration complete message, and sends an SN state transmission message to the target base station based on the Xn interface to indicate the SN information of the uplink and downlink data which is forwarded. And the source base station indicates the target base station to downlink the next PDCP SN and indicates the uplink first lost PDCP SDU.
Step 103: and the target base station receives the RRC reconfiguration completion message and the SN state transmission message, responds to the RRC reconfiguration completion message and the SN state transmission message, sends a path switching request to the 5GC and triggers path switching.
Further, the method further comprises: and the target base station discards SDUs with SNs smaller than the numerical value in the message according to the indication of the SN state transmission message, distributes the next PDCP SN, and sends uplink data to the 5 GC.
The specific handover procedure is shown in fig. 5, and includes steps 501 to 513, and the following steps are described in detail, and the DAPS handover procedure based on the Xn interface in the prior art is shown in fig. 3.
Step 501: and the source base station selects a proper adjacent cell as a target base station for switching according to the measurement report content reported by the UE and the switching strategy.
Step 502: and the source base station selects a switching mode according to the Xn link establishment condition and executes the Xn switching. The source base station sends a switching request message to the target base station, wherein the message carries information required by the switching preparation stage of the target base station.
Step 503: the target base station receives the switching request message through the Xn interface, establishes UE context in the target base station and allocates related resources for the UE.
And simultaneously, establishing an uplink and downlink data forwarding tunnel for switching, and distributing tunnel ID. And carrying related data forwarding information to a switching request notification message according to the data forwarding strategy. The handover request notification message needs to configure RB bearer DAPS for DAPS handover. The target base station sends a 'handover request notification' message to the source base station.
Step 504: and the source base station receives the switching request notification message and configures a related PDU Session and DRB (data radio bearer) forwarding tunnel according to the carried data forwarding information.
And simultaneously extracting the RRC reconfiguration content in the switching request notification message and sending a switching command to the UE.
After the switching command is sent, the source base station sends an early state transition message to the target base station to start data forwarding. The source base station continues to allocate downlink data SN (sequence number) and send to the UE, and meanwhile, continuously sends uplink data to the 5 GC.
Step 505: after receiving the 'early state transfer' message, the target base station starts up the uplink and downlink forwarding data cache, and discards SDU (service data unit) with SN less than the median value of the message according to the information carried in the message.
Step 506: and after receiving the switching command issued by the base station, the UE completes the establishment of the related DAPS according to the DAPS configuration.
And simultaneously, the UE starts to synchronize to the target base station, initiates a random access process, and sends an RRC reconfiguration completion message to the target base station after the random access is completed.
And after receiving the RRC reconfiguration complete feedback confirmation of the target base station, the UE sends an RRC reconfiguration complete message to the source base station.
Step 507: the target base station receives the RRC reconfiguration complete message, which indicates that the UE and the base station complete synchronization and random access.
And the target base station starts downlink cache data transmission and transmits downlink forwarding data to the UE.
Step 508: and after receiving the RRC reconfiguration completion message, the source base station stops distributing the downlink PDCP SN and simultaneously stops sending uplink data to the 5 GC.
And the source base station sends an SN state transfer message to the target base station to indicate the SN information of the uplink and downlink data which is forwarded. And the source base station indicates the target base station to downlink the next PDCP SN and indicates the uplink first lost PDCP SDU.
Step 509: after receiving the SN state transfer message, the target base station discards SDU with SN less than the median of the message according to the message indication, and is responsible for maintaining the downlink PDCP SN, distributing the next PDCP SN, and simultaneously sending the uplink data to the 5 GC.
Step 510: after receiving the messages of 'RRC reconfiguration completion' and 'SN state transfer', the target base station starts path switching, sends a 'path switching request' message to an AMF (access and mobility function unit in a 5G core network) and switches a downlink data path.
Step 511: and 5GC detects that the downlink data transmission is finished, and transmits a data end mark (data end mark) to the source base station.
And after receiving the data end mark, the source base station deletes the related forwarding tunnel and forwards the data end mark to the target base station.
And after receiving the data end mark, the target base station also deletes the forwarding tunnel.
Step 512: after receiving the 'path switching notification' message of the 5GC, the destination base station indicates that the downlink path switching is completed, and sends a 'UE context release' message to the source base station to notify the release of the UE context.
Step 513: and after receiving the UE context release message, the source base station deletes the UE context of the source base station.
As shown in fig. 2, an embodiment of the present invention provides a DAPS handover method based on Ng interface,
step 201: and after receiving the switching command issued by the base station, the UE completes the establishment of the related DAPS according to the DAPS configuration.
And simultaneously, the UE starts to synchronize to the target base station, initiates a random access process, and sends an RRC reconfiguration completion message to the target base station after the random access is completed.
And after receiving the feedback confirmation of the RRC reconfiguration complete message of the target base station, the UE sends the RRC reconfiguration complete message to the source base station.
The existing DAPS switching method needs to wait for UE to finish the random access process of a target cell, and after reporting an RRC reconfiguration completion message to the target cell, the target cell informs a source cell of the completion of switching through a switching success message. This process is a serial process, which increases the control plane signaling delay. In this embodiment, the UE directly notifies the source base station through the air interface, so as to reduce the time delay for switching the control plane.
Further, the method further comprises: the target base station receives the RRC reconfiguration complete message to indicate that the UE and the base station complete synchronization and random access, starts downlink cache data transmission and transmits downlink forwarding data to the UE.
Step 202: the source base station receives an RRC reconfiguration completion message; and responding to the RRC reconfiguration complete message, and sending an uplink RAN state transmission message to the 5GC based on the Ng interface, wherein the uplink RAN state transmission message indicates that the forwarding of the uplink and downlink data SN information is completed. And the source base station indicates the target base station to downlink the next PDCP SN and indicates the uplink first lost PDCP SDU.
Step 203: the target base station receives the RRC reconfiguration completion message and the downlink RAN state transmission message; and sending a switching notification to the 5GC in response to the RRC reconfiguration complete message and the downlink RAN state transmission message, wherein the switching notification indicates that the switching is completed.
The sequence of the uplink RAN state transmission message and the downlink RAN state transmission message is advanced, so that compared with the prior art, a target base station can forward uplink data aiming at UE/5GC earlier without waiting for a switching notification and a switching success message and then sending the switching notification and the switching success message, and therefore the Ng switching can effectively reduce data plane time delay caused by the uplink data forwarding.
Further, the method further comprises: and the target base station discards SDU with SN less than the numerical value in the message according to the indication of the downlink RAN state transmission message, distributes the next PDCP SN, and sends uplink data to the 5 GC.
The specific handover procedure is shown in fig. 6, and includes steps 601 to 613, which are described in detail below, and the DAPS handover procedure based on the Xn interface in the prior art is shown in fig. 4.
Step 601: and the source base station selects a proper adjacent cell as a target base station for switching according to the measurement report content reported by the UE and the switching strategy.
Step 602: and the source base station selects a switching mode according to the Xn link establishment condition and executes the Ng switching. The source base station sends a 'switching request' message to the 5GC, wherein the message carries the information required by the switching preparation stage of the target base station.
And after receiving the switching request message, the 5GC sends the switching request message to the target base station according to the ID of the target base station.
Step 603: and the target base station receives the switching request message through the Ng interface, establishes the UE context in the target base station and allocates related resources for the UE.
And simultaneously establishing an uplink and downlink data forwarding tunnel for switching, and distributing tunnel ID. And carrying related data forwarding information to a switching request notification message according to the data forwarding strategy. The handover request notification message needs to configure RB bearer DAPS for DAPS handover.
The target base station transmits a handover request notification message to the 5 GC. After receiving the message, the 5GC sends a 'handover command' message to the source base station.
Step 604: and the source base station receives the switching command message, and configures related PDU Session and DRB (data radio bearer) forwarding tunnels according to the carried data forwarding information.
And simultaneously, extracting the RRC reconfiguration content in the switching command message and sending a switching command to the UE.
After sending the handover command, the source base station sends an "uplink RAN early state transition" message to the 5GC, and starts data forwarding. And 5, after receiving the message, the GC sends a downlink RAN early state transition message to the target base station.
The source base station continues to allocate downlink data SN (sequence number) and sends the downlink data SN to the UE, and simultaneously continuously sends uplink data to the 5 GC.
Step 605: after receiving the message of 'early state transfer of downlink RAN', the target base station starts up the buffer of uplink and downlink forwarding data, and discards SDU with SN less than the median of the message according to the information carried in the message.
Step 606: and after receiving the switching command issued by the base station, the UE completes the establishment of the related DAPS according to the DAPS configuration.
And simultaneously, the UE starts to synchronize with the target base station, initiates a random access process, and sends an RRC reconfiguration completion message to the target base station after the random access is completed.
And after receiving the RRC reconfiguration complete feedback confirmation of the target base station, the UE sends an RRC reconfiguration complete message to the source base station.
Step 607: the target base station receives the RRC reconfiguration complete message, which indicates that the UE and the base station complete synchronization and random access.
And the target base station starts downlink cache data transmission and transmits downlink forwarding data to the UE.
Step 608: and after receiving the RRC reconfiguration completion message, the source base station stops distributing the downlink PDCP SN and simultaneously stops sending uplink data to the 5 GC.
And the source base station sends an uplink RAN state transfer message to the 5GC, and the 5GC sends a downlink RAN state transfer message to the target base station after receiving the message, and indicates the forwarded uplink and downlink data SN information. And the source base station indicates the target base station to downlink the next PDCP SN and indicates the uplink first lost PDCP SDU.
Step 609: after receiving the message of 'downlink RAN state transfer', the target base station discards SDU with SN less than the median of the message according to the message indication, and is responsible for maintaining downlink PDCP SN, distributing next PDCP SN, and simultaneously sending uplink data to 5 GC.
Step 610: and after receiving the messages of 'RRC reconfiguration completion' and 'SN state transfer', the target base station informs 5GC of completion of switching, performs path switching, sends a 'switching notification' message to the AMF, and switches a downlink data path.
Step 611: 5GC detects the completion of the downlink data transmission, and transmits a data end mark (data end mark) to the source base station.
And after receiving the data end mark, the source base station deletes the related forwarding tunnel and forwards the data end mark to the target base station.
And after receiving the data end mark, the target base station also deletes the forwarding tunnel.
Step 612: the 5GC sends a 'UE context release order' message to the source base station, and informs the source base station to release the UE context.
Step 613: and after receiving the UE context release command message, the source base station deletes the UE context of the source base station, sends a UE context release completion message to the 5GC and informs the 5GC of the completion of the UE context deletion.
The embodiment of the invention also provides the user equipment, which comprises a transceiver; and a controller configured to:
and after receiving the switching command issued by the base station, the user equipment completes the establishment of the related DAPS according to the DAPS configuration.
And simultaneously, the user equipment starts to synchronize to the target base station, initiates a random access process, and sends an RRC reconfiguration completion message to the target base station after the random access is completed. And after receiving the RRC reconfiguration completion feedback confirmation of the target base station, the UE sends an RRC reconfiguration completion message to the source base station.
The embodiment of the invention also provides a source base station in DAPS switching, which is used for receiving the RRC reconfiguration complete message and responding to the RRC reconfiguration complete message, and sending the SN state transmission message to the target base station based on the Xn interface, or sending the uplink RAN state transmission message to the 5GC based on the Ng interface, and indicating the SN information of the uplink and downlink data which are already forwarded.
The embodiment of the invention also provides a target base station in DAPS switching, which is used for receiving the RRC reconfiguration completion message and the SN state transmission message; responding to the RRC reconfiguration completion message and the SN state transmission message, sending a path switching request to the 5GC, and triggering path switching; or receiving an RRC reconfiguration complete message and a downlink RAN state transmission message; and responding to the RRC reconfiguration complete message and the downlink RAN state transmission message, sending a switching notification to the 5GC, and triggering the path switching.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. A DAPS handover method, the method comprising:
the source base station receives an RRC reconfiguration completion message;
in response to the RRC reconfiguration complete message,
and sending an SN state transmission message to the target base station based on the Xn interface, and indicating the SN information of the uplink and downlink data which is already forwarded.
2. The DAPS handover method according to claim 1, wherein:
further comprising: the target base station receives the RRC reconfiguration completion message and the SN state transmission message;
and responding to the RRC reconfiguration complete message and the SN state transmission message, sending a path switching request to the 5GC, and triggering path switching.
3. The DAPS handover method according to claim 2, wherein:
further comprising: and after receiving the RRC reconfiguration completion message, the target base station sends downlink forwarding data to the UE.
4. The DAPS handover method according to claim 2, wherein:
further comprising: and the target base station discards SDU with SN less than the numerical value in the message according to the indication of the SN state transmission message, distributes the next PDCP SN, and sends uplink data to the 5 GC.
5. A DAPS handover method, the method comprising:
the source base station receives an RRC reconfiguration completion message;
in response to the RRC reconfiguration complete message,
and sending an uplink RAN state transmission message to the 5GC based on the Ng interface, and indicating the information of the SN of the uplink and downlink data which is already forwarded.
6. The DAPS handover method according to claim 5, wherein:
further comprising: the target base station receives the RRC reconfiguration completion message and the downlink RAN state transmission message;
and responding to the RRC reconfiguration complete message and the downlink RAN state transmission message, sending a switching notification to the 5GC, and triggering the path switching.
7. The DAPS handover method according to claim 6, wherein:
further comprising: and after receiving the RRC reconfiguration completion message, the target base station sends downlink forwarding data to the UE.
8. The DAPS handover method according to claim 6, wherein:
further comprising: and the target base station discards SDU with SN less than the numerical value in the message according to the indication of the downlink RAN state transmission message, distributes the next PDCP SN, and sends uplink data to the 5 GC.
9. A network device comprising a memory and a processor, the memory having stored thereon a computer program operable on the processor, wherein the processor, when executing the computer program, performs the steps of the DAPS handover method according to any of claims 1-8.
10. User equipment, characterized in that, the user equipment comprises
A transceiver; and
a controller configured to:
and after the target base station completes random access and receives the feedback confirmation of RRC reconfiguration completion from the target base station, sending an RRC reconfiguration completion message to the source base station.
CN202210483677.XA 2022-05-06 2022-05-06 DAPS switching method, network equipment and user equipment Pending CN114585034A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
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CN115334607A (en) * 2022-10-12 2022-11-11 武汉世炬信息技术有限公司 Method and system for reducing DAPS switching time delay based on NG interface
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