CN110708720A - Switching method, distribution unit, terminal, central unit and computer storage medium - Google Patents

Switching method, distribution unit, terminal, central unit and computer storage medium Download PDF

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Publication number
CN110708720A
CN110708720A CN201810752888.2A CN201810752888A CN110708720A CN 110708720 A CN110708720 A CN 110708720A CN 201810752888 A CN201810752888 A CN 201810752888A CN 110708720 A CN110708720 A CN 110708720A
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China
Prior art keywords
data transmission
data
sends
processor
computer program
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CN201810752888.2A
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CN110708720B (en
Inventor
刘亮
李刚
刘洋
杨光
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China Mobile Communications Group Co Ltd
China Mobile Communications Ltd Research Institute
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China Mobile Communications Group Co Ltd
China Mobile Communications Ltd Research Institute
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • 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
    • 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
    • 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

Abstract

The invention discloses a switching method, a distribution unit, a terminal, a centralized unit and a computer storage medium, wherein the method comprises the following steps: after a first Distribution Unit (DU) sends a command related to handover to User Equipment (UE), data transmission continues among a Central Unit (CU), the first DU and the UE; and when the first DU receives a switching completion indication sent by the CU, stopping data transmission among the CU, the first DU and the UE.

Description

Switching method, distribution unit, terminal, central unit and computer storage medium
Technical Field
The present invention relates to wireless communication technologies, and in particular, to a handover method, a distribution unit, a terminal, a central unit, and a computer storage medium.
Background
How to design a flexible and robust access network architecture is the key of a mobile communication system, a 3GPP RAN congress initiates a 5G scenario and requirement research project in 12 months in 2015, a 5G scenario and requirement research report passed by a 71 th RAN congress explicitly indicates requirements for the 5G access network architecture, wherein the most typical requirements different from a 4G access network are that the access network supports logical function division of a distributed Remote Unit (RU) and a Central Unit (CU), and that a protocol stack function is migrated between the CU and a Distributed Unit (DU).
A CU is a centralized node that can control and coordinate multiple cells, including protocol stack high-level control and data functions, and possibly also a portion of the baseband processing functions. The DU realizes the radio frequency front end (RRH) function and other baseband processing functions by the distributed unit, and the CU is connected with the DU through a forward interface. According to the 3GPP RAN3 conclusion, the standardized PDCP-RLC segmentation scheme, i.e., a Packet Data Convergence Protocol (PDCP) layer and a Radio Resource Control (RRC) layer, will be located in the CU, while a Radio Link Control (RLC) layer, a Medium Access Control (MAC) layer and a physical layer (PHY) layer are located in the DU.
The ITU defines three broad classes of application scenarios for 5G and proposes a key indicator capability that is more challenging than 4G, requiring, in terms of the air interface (NR), a lossless handover with low or even "zero" interruption delay while switching within the NR, maintaining continuity of traffic.
Each cell under CU-DU architecture can only be controlled and served by one DU. Thus, when handover from a source cell to a target cell is involved, the terminal needs to perform cell handover across DUs if they are not under the control of the same DU. How to implement lossless handover across DU "zero" interruption latency inside one CU is a key issue that is not yet clear.
In the existing LTE protocol, when a User Equipment (UE) needs to be handed over from a source enhanced eNB (eNB) to a target eNB, the source eNB instructs the UE to initiate a handover process to the target eNB in an RRC reconfiguration signaling sent to the UE, and then stops sending downlink data to the UE. Before the synchronization and random access process is completed to the target base station, the data link between the UE and the network is broken, that is, the switching requirement of "zero" interruption delay cannot be satisfied. There is no effective solution to this problem in the related art.
Disclosure of Invention
In view of the above, embodiments of the present invention are to provide a handover method, a DU, a UE, a CU, and a computer storage medium, which at least solve the problems in the prior art.
The technical scheme of the embodiment of the invention is realized as follows:
the switching method of the embodiment of the invention comprises the following steps:
after a first DU sends a switching related command to UE, data transmission is continued among a CU, the first DU and the UE;
and when the first DU receives a switching completion indication sent by the CU, stopping data transmission among the CU, the first DU and the UE.
In the above scheme, the method further comprises:
the first DU sends data transmission status for the UE to the CU.
In the foregoing solution, continuing data transmission among the CU, the first DU, and the UE includes:
and the first DU continues to maintain the F1 interface connection with the CU, and the air interface connection of the first DU and the UE, so that the CU continues to send data to the DU.
In the above scheme, the switching completion indication is encapsulated by a special message;
or, encapsulating the handover complete indication into a non-dedicated F1 interface message.
In the above scheme, the data transmission status is sent in the form of a data transmission status report;
the data transmission state report adopts special message encapsulation;
or, encapsulating the data transmission status report into a non-dedicated F1 interface message;
or, the data transmission state report is packaged into a data plane GTP-U extension header.
The switching method of the embodiment of the invention comprises the following steps:
the UE receives the relevant information of connection reconfiguration sent by the CU through the first DU;
and the UE initiates random access to a second DU according to the related information of the connection reconfiguration and continues to perform data transmission with the first DU.
In the above scheme, the method further comprises:
and the UE sends the related information of the connection reconfiguration to the CU through the second DU.
The switching method of the embodiment of the invention comprises the following steps:
the CU receives relevant information of a measurement report forwarded from the UE via the first DU;
the CU makes a decision to switch the UE based on the relevant information of the measurement report;
and continuing data transmission among the CU, the first DU and the UE until the first DU receives a switching completion instruction sent by the CU, and stopping data transmission among the CU, the first DU and the UE.
In the above scheme, the method further comprises: after the CU receives the relevant information of the measurement report transmitted from the UE through the first DU, the CU sends a UE context establishment request to the second DU, and the CU receives a UE context establishment request reply fed back by the second DU.
In the above scheme, the method further comprises: after the CU receives relevant information of a measurement report forwarded from the UE through the first DU, the CU sends a radio resource configuration request to the second DU;
and after receiving the UE context establishment request reply fed back by the second DU, the CU sends an RRC connection reconfiguration instruction to the second DU.
In the above scheme, the method further comprises:
and after receiving the wireless resource configuration completion indication fed back by the second DU, the CU sends the relevant information of connection reconfiguration to the UE through the first DU.
In the above scheme, the method further comprises:
stopping sending data to the first DU after the CU confirms that the connection reconfiguration is finished;
the CU sends a handover complete indication to the first DU in a handover complete indication message.
In the above scheme, the method further comprises:
stopping sending data to the first DU after the CU confirms that the connection reconfiguration is finished;
the CU sends a handover complete indication to the first DU in a UE context modification request message.
In the above scheme, the method further comprises:
the CU receives a data transmission status report for the UE sent via the first DU.
In the above scheme, the method further comprises: after the CU receives the data transmission status report for the UE sent via the first DU, the CU sends feedback of the data that was not successfully received by the first DU to the UE via the first DU.
In the above scheme, the method further comprises: after the CU receives the data transmission status report for the UE sent via the first DU, the CU sends feedback to the UE via the first DU that the first DU successfully receives new data.
In the above scheme, the method further comprises:
the CU receiving data transmission conditions for the UE sent via the first DU;
the CU sends data aiming at the UE to a second DU according to the data transmission condition;
the data for the UE includes: data that the UE did not successfully receive from the first DU and new data.
In the above scheme, the switching completion indication is encapsulated by a special message;
or, encapsulating the handover complete indication into a non-dedicated F1 interface message.
In the above scheme, the data transmission status is sent in the form of a data transmission status report;
the data transmission state report adopts special message encapsulation;
or, encapsulating the data transmission status report into a non-dedicated F1 interface message;
or, the data transmission state report is packaged into a data plane GTP-U extension header.
The switching method of the embodiment of the invention comprises the following steps:
the second DU receives a request of resource configuration of the CU;
and the DU replies configuration completion information to the CU.
In the above scheme, the method further comprises:
and the second DU sends the related information of connection reconfiguration completion to the CU.
In the above scheme, the method further comprises:
the second DU transmits data for the UE to the UE;
the data for the UE includes: data that the UE did not successfully receive from the first DU and new data.
In the above scheme, the method further comprises:
and the second DU sends the downlink data packet to the UE through an air interface.
The first DU of the embodiment of the present invention includes: a processor and a memory for storing a computer program capable of running on the processor;
wherein the processor is configured to implement the steps of the method of any one of the above aspects when running the computer program.
The UE of the embodiment of the invention comprises: a processor and a memory for storing a computer program capable of running on the processor;
wherein the processor is configured to implement the steps of the method of any one of the above aspects when running the computer program.
A CU of an embodiment of the present invention includes: a processor and a memory for storing a computer program capable of running on the processor;
wherein the processor is configured to implement the steps of the method of any one of the above aspects when running the computer program.
The second DU of the embodiment of the present invention includes: a processor and a memory for storing a computer program capable of running on the processor;
wherein the processor is configured to implement the steps of the method of any one of the above aspects when running the computer program.
The computer storage medium of the embodiment of the present invention stores thereon a computer program, wherein the computer program realizes the steps of the method of any one of the above schemes when being executed by a processor.
By adopting the embodiment of the invention, after the first DU sends the switching related command to the UE, data transmission is continued among the CU, the first DU and the UE; and when the first DU receives a switching completion indication sent by the CU, stopping data transmission among the CU, the first DU and the UE. In the UE switching process, data transmission can be kept among the CU, the first DU and the UE, so that the switching requirement of zero interruption time delay is met.
Drawings
FIG. 1 is a flow chart of a method according to an embodiment of the present invention;
FIG. 2 is a flow chart of "zero" interrupt latency switching for a CU-DU architecture in accordance with an embodiment of the present invention;
fig. 3 is another flow chart of the CU-DU architecture "zero" interrupt latency switch applying the embodiment of the present invention.
Detailed Description
The following describes the embodiments in further detail with reference to the accompanying drawings.
As shown in fig. 1, the handover method of the embodiment of the present invention includes:
step 101, after the first DU sends a handover-related command to the UE, data transmission continues among the CU, the first DU, and the UE.
Here, the first DU may be a source DU, and after a handover command (handover command) is sent to the UE, data transmission is continued among the CU, the source DU, and the UE.
Step 102, when the first DU receives a handover complete indication sent by the CU, stopping data transmission among the CU, the first DU, and the UE.
Here, the first DU may be a source DU, the second DU may be a target DU, and when the source DU receives a handover complete indication (e.g., handover complete indication) sent by the CU, the data transmission among the CU, the first DU, and the UE is stopped.
In a practical application, after the source DU sends a handover-related command to the UE, data transmission is continued between the CU and the UE until the UE successfully accesses the target DU and the CU sends a handover completion instruction to the source DU, the data transmission is not stopped among the CU, the source DU, and the UE, the source DU sends a data transmission status for the UE to the CU, the CU sends data for the UE to the target DU according to the data transmission status for the UE from the source DU, and the continuity of data transmission for the UE is ensured while achieving the inter-DU handover.
In an embodiment of the present invention, the first DU sends a data transmission status for the UE to the CU, and the CU sends data for the UE to the second DU according to the data transmission status for the UE of the first DU.
In an embodiment of the present invention, continuing data transmission among the CU, the first DU, and the UE includes: and the first DU continues to maintain the F1 interface connection with the CU, and the air interface connection of the first DU and the UE, so that the CU continues to send data to the DU. For the F1 interface, the CU and the DU are connected by an F1 interface.
In an actual application, after sending the handover command to the UE, the source DU continues to maintain the F1 connection with the CU and the air interface connection with the UE, and the CU continues to send data to the source DU.
In an embodiment of the present invention, the handover completion indication is encapsulated by a special message. Or, encapsulating the handover complete indication into a non-dedicated F1 interface message.
In one practical application, the CU sends a handover complete indication to the source DU, informing the source DU to stop sending data to the UE, and the indication may use a dedicated message or encapsulate the indication IE into a non-dedicated F1 interface message.
In an implementation manner of an embodiment of the present invention, the data transmission status is sent in a form of a data transmission status report; the data transmission state report adopts special message encapsulation; or, encapsulating the data transmission status report into a non-dedicated F1 interface message; or, the data transmission state report is packaged into a data plane GTP-U extension header.
In one practical application, the source DU sends a data transmission status report to the CUs, which may use a dedicated message or encapsulate the indication IE into a non-dedicated F1 interface message or into a data plane GTP-U extension header.
The embodiment of the invention is suitable for a brand-new CU-DU framework in 5G, and particularly can realize the switching of zero interrupt time delay in a scene of switching among inter-DUs in a CU. And does not depend on the double receiving and sending of the terminal, and the CU coordinates the time of establishing and interrupting the connection between the two DUs and the user, so as to ensure that the user data is not interrupted. Including but not limited to the following core:
1. the source DU forwards a measurement report of the UE to the CU, and the CU makes a switching decision;
2. the CU sends a UE context establishment and radio resource configuration request to the target DU;
3. the target DU confirms that the switching preparation work is completed to the CU;
4. the CU sends RRC connection reconfiguration information to the UE through the source DU;
5. UE initiates random access to a target DU and continues to perform data interaction with a source DU;
6. stopping sending data to the source DU after the CU confirms that the RRC connection reconfiguration is finished;
7. CU sends a switching completion message to the source DU, and the source DU stops sending data to UE;
8. the source DU replies the data sending status to the UE to the CU;
9. the CU sends to the target DU the data that the UE did not successfully receive from the source DU, as well as new data.
The above core points are specifically described in the following embodiments.
The switching method of the embodiment of the invention comprises the following steps:
the UE sends the related information of the measurement report (such as the measurement report of the UE) to a first DU (such as a source DU), and the first DU forwards the related information of the measurement report to the CU; the UE receives a handover-related command (e.g. handover command) sent by the DU, and the CU makes a decision to handover the UE based on the information related to the measurement report. And continuing data transmission among the CU, the first DU, and the UE until the first DU receives a handover complete indication (e.g., handover complete indication) sent by the CU, stopping data transmission among the CU, the first DU, and the UE.
In an implementation manner of the embodiment of the present invention, the method further includes: the UE receives information (e.g., RRC connection reconfiguration information) related to connection reconfiguration sent by the CU via the first DU. And the UE initiates random access to a second DU according to the related information of the connection reconfiguration and continues to perform data transmission with the first DU.
In an implementation manner of the embodiment of the present invention, the method further includes: and the UE sends the related information of the connection reconfiguration to the CU through the second DU, so that the CU stops sending the downlink data packet to the first DU.
The switching method of the embodiment of the invention comprises the following steps:
the CU receives information related to a measurement report (e.g., a measurement report of the UE) forwarded from the UE via a first DU (e.g., a source DU). The CU makes a decision to have the UE switch based on the information related to the measurement report. And continuing data transmission among the CU, the first DU and the UE until the first DU receives a handover completion indication (handover indication) sent by the CU, and stopping data transmission among the CU, the first DU and the UE.
In an implementation manner of the embodiment of the present invention, the method further includes: and the CU sends a request for UE context establishment and wireless resource configuration to a second DU, so that the second DU establishes a corresponding UE context and configures wireless resources according to the information in the request.
In an implementation manner of the embodiment of the present invention, the method further includes: after the CU receives the radio resource configuration completion indication sent by the DU, the CU sends the relevant information of connection reconfiguration (e.g., RRC connection reconfiguration information) to the UE via the first DU, so that the UE initiates random access to the second DU according to the relevant information of connection reconfiguration.
In an implementation manner of the embodiment of the present invention, the method further includes: stopping sending data to the first DU after the CU confirms that the connection reconfiguration is finished; and the CU sends a handover completion indication (handover indication) to the first DU, so that the first DU stops sending data to the UE.
In an implementation manner of the embodiment of the present invention, the method further includes: the CU receiving data transmission conditions for the UE sent via the first DU; the CU sends data aiming at the UE to a second DU according to the data transmission condition; the data for the UE includes: data that the UE did not successfully receive from the first DU and new data.
In an embodiment of the present invention, the handover completion indication is encapsulated by a special message. Or, encapsulating the handover complete indication into a non-dedicated F1 interface message.
In one practical application, the CU sends a handover complete indication to the source DU, informing the source DU to stop sending data to the UE, and the indication may use a dedicated message or encapsulate the indication IE into a non-dedicated F1 interface message.
In an implementation manner of the embodiment of the present invention, the data transmission status is sent in a form of a data transmission status report. The data transmission state report adopts special message encapsulation; or, encapsulating the data transmission status report into a non-dedicated F1 interface message; or, the data transmission state report is packaged into a data plane GTP-U extension header.
In one practical application, the CU receives a data transmission status report sent by the source DU, and the status report may be encapsulated in a non-dedicated F1 interface message or in a data plane GTP-U extension header, using a dedicated message or an indication IE.
The switching method of the embodiment of the invention comprises the following steps:
after a CU makes a decision to switch the UE based on information related to a measurement report forwarded by the UE via a first DU, a second DU continues to transmit data among the CU, the first DU, and the UE until the first DU receives a handover complete indication (handover complete indication) sent by the CU, and stops transmitting data among the CU, the first DU, and the UE.
In an embodiment of the present invention, a second DU receives a request for resource allocation of a CU; and the DU replies configuration completion information to the CU.
In an implementation manner of the embodiment of the present invention, the method further includes: the second DU receives a request of UE context establishment and radio resource configuration sent by the CU; and the second DU establishes a corresponding UE context and configures wireless resources according to the information in the request.
In an implementation manner of the embodiment of the present invention, the method further includes: the second DU sends a response to the CU to confirm that the second DU has completed the handover preparation task.
In an implementation manner of the embodiment of the present invention, the method further includes: the second DU sends information (e.g., RRC reconfiguration complete signaling) about the completion of the connection reconfiguration to the CU, so as to notify the CU to terminate sending downlink packets to the first DU.
In an implementation manner of the embodiment of the present invention, the method further includes: the second DU transmits data for the UE to the UE; the data for the UE includes: data that the UE did not successfully receive from the first DU and new data.
In an implementation manner of the embodiment of the present invention, the method further includes: and the second DU sends the downlink data packet to the UE through an air interface.
The application scene one: the CU sends a handover complete notification indication to the source DU, which indication uses special messaging.
The specific process is shown in fig. 2, and comprises the following steps:
step 201, the UE sends related information of the RRC measurement report to the source DU.
Step 202, the DU forwards the RRC measurement report to the source CU, and the CU makes a decision to switch the UE according to the relevant content of the RRC measurement report.
Step 203, the CU sends a request for F1UE Context (Context) establishment and DRB configuration to the target DU, and the target DU establishes a corresponding UE Context and configures radio resources according to information in the request.
In step 204, the target DU sends a response to the CU, such as a UE context setup request reply, to confirm that the target DU has completed the handover preparation task.
And step 205, the CU sends the RRC connection reconfiguration information to the UE through the source base station.
Step 206, according to the RRC connection reconfiguration message, the UE performs random access to the target DU, and meanwhile, the UE continues to perform data interaction with the source DU.
And step 207, after the UE sends the RRC reconfiguration complete signaling to the CU through the target DU, the CU stops sending the downlink data packet to the source DU.
In step 208, the CU sends a handover complete notification indication to the source DU, which is delivered using a dedicated message, at which point the source DU stops sending data packets to the UE.
Step 209, the source DU replies the current downlink data status report to the CU, including the Sequence Number (SN) of the unsuccessfully transmitted Packet Data Convergence Protocol (PDCP). Wherein, the status report is transmitted in the GTP-U extension header of the data plane. Alternatively, the status report is transmitted to the CUs using dedicated signaling.
In step 210, the CU sends to the target DU a PDCP packet and a new downlink PDCP packet that the UE did not successfully receive from the source DU.
Step 211, the target DU sends the downlink data packet to the UE through an air interface.
It should be noted that: the network element device types of the source DU and the target DU may be base stations, that is, the source DU may be a source base station, and the target DU may be a target base station.
Application scenario two: the CU sends a handover complete notification indication to the source DU, which is encapsulated in a non-dedicated F1 interface message for delivery.
The specific process is shown in fig. 3, and comprises the following steps:
step 301, the UE sends related information of the RRC measurement report to the source DU.
Step 302, the source DU forwards the RRC measurement report to the CU, and the CU makes a decision to switch the UE according to the related content of the RRC measurement report.
Step 303, CU sends F1UE Context setup and DRB configuration request to target DU, which sets up corresponding UE Context and configures radio resource according to the information in the request.
Step 304, the target DU sends a response to the CU, such as a UE context setup request reply, to confirm that the target DU has completed the handover preparation.
Step 305, the CU sends the RRC connection reconfiguration information to the UE via the source base station.
Step 306, according to the RRC connection reconfiguration message, the UE performs random access to the target DU, and meanwhile, continues to perform data interaction with the source DU.
And 307, after the UE sends the RRC reconfiguration complete signaling to the CU through the target DU, the CU stops sending the downlink data packet to the source DU.
In step 308, the CU sends a handover complete notification indication to the source DU, and the indication information is encapsulated in the non-dedicated F1 interface message, at this time, the source DU stops sending data packets to the UE.
Step 309, the source DU replies the current downlink data status report to the CU, including the SN number of the unsuccessfully transmitted PDCP. Wherein the status report IE is encapsulated into a non-dedicated F1 interface message. Alternatively, the status report is transmitted to the CUs using dedicated signaling. Or, the CU sends to the target DU a PDCP packet that the UE did not successfully receive from the source DU and a new downlink PDCP packet.
Step 310, the target DU sends the downlink data packet to the UE through an air interface.
It should be noted that: the network element device types of the source DU and the target DU may be base stations, that is, the source DU may be a source base station, and the target DU may be a target base station.
A first DU according to an embodiment of the present invention includes: a processor and a memory for storing a computer program capable of running on the processor; wherein the processor is configured to implement the steps of the method of any one of the above embodiments when running the computer program.
The UE of the embodiment of the invention comprises: a processor and a memory for storing a computer program capable of running on the processor; wherein the processor is configured to implement the steps of the method of any one of the above embodiments when running the computer program.
A CU of an embodiment of the present invention includes: a processor and a memory for storing a computer program capable of running on the processor; wherein the processor is configured to implement the steps of the method of any one of the above embodiments when running the computer program.
A second DU according to an embodiment of the present invention includes: a processor and a memory for storing a computer program capable of running on the processor; wherein the processor is configured to implement the steps of the method of any one of the above embodiments when running the computer program.
A computer storage medium of an embodiment of the present invention has a computer program stored thereon, where the computer program is executed by a processor to implement the steps of any of the methods of the above embodiments.
The integrated module according to the embodiment of the present invention may also be stored in a computer-readable storage medium if it is implemented in the form of a software functional module and sold or used as an independent product. Based on such understanding, the technical solutions of the embodiments of the present invention may be essentially implemented or a part contributing to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes. Thus, embodiments of the invention are not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims (23)

1. A method of handover, the method comprising:
after a first distribution unit DU sends a switching related command to user equipment UE, data transmission is continued among a central unit CU, the first DU and the UE;
and when the first DU receives a switching completion indication sent by the CU, stopping data transmission among the CU, the first DU and the UE.
2. The method of claim 1, further comprising:
the first DU sends data transmission status for the UE to the CU.
3. The method of claim 1, wherein continuing data transmission between a CU, the first DU, and the UE comprises:
and the first DU continues to maintain the F1 interface connection with the CU, and the air interface connection of the first DU and the UE, so that the CU continues to send data to the DU.
4. The method according to any of claims 1 to 3, wherein the handover complete indication is encapsulated with a special message;
or, encapsulating the handover complete indication into a non-dedicated F1 interface message.
5. The method of claim 2, wherein the data transmission condition is sent in the form of a data transmission status report;
the data transmission state report adopts special message encapsulation;
or, encapsulating the data transmission status report into a non-dedicated F1 interface message;
or, the data transmission state report is packaged into a data plane GTP-U extension header.
6. A method of handover, the method comprising:
the user equipment UE receives the relevant information of connection reconfiguration sent by the central unit CU through the first distribution unit DU;
and the UE initiates random access to a second DU according to the related information of the connection reconfiguration and continues to perform data transmission with the first DU.
7. The method of claim 6, further comprising:
and the UE sends the related information of the connection reconfiguration to the CU through the second DU.
8. A method of handover, the method comprising:
the central unit CU receives information about measurement reports forwarded from the UE via the first distribution unit DU;
the CU makes a decision to switch the UE based on the relevant information of the measurement report;
and continuing data transmission among the CU, the first DU and the UE until the first DU receives a switching completion instruction sent by the CU, and stopping data transmission among the CU, the first DU and the UE.
9. The method of claim 8, further comprising:
the CU sends a request for UE context establishment and radio resource configuration to the second DU.
10. The method of claim 8, further comprising:
and after receiving the wireless resource configuration completion indication sent by the second DU, the CU sends the relevant information of connection reconfiguration to the UE through the first DU.
11. The method of claim 8, further comprising:
stopping sending data to the first DU after the CU confirms that the connection reconfiguration is finished;
the CU sends a handover complete indication to the first DU.
12. The method of claim 8, further comprising:
the CU receiving data transmission conditions for the UE sent via the first DU;
the CU sends data aiming at the UE to a second DU according to the data transmission condition;
the data for the UE includes: data that the UE did not successfully receive from the first DU and new data.
13. The method of claim 8, wherein the handover complete indication is encapsulated with a special message;
or, encapsulating the handover complete indication into a non-dedicated F1 interface message.
14. The method of claim 12, wherein the data transmission condition is sent in the form of a data transmission status report;
the data transmission state report adopts special message encapsulation;
or, encapsulating the data transmission status report into a non-dedicated F1 interface message;
or, the data transmission state report is packaged into a data plane GTP-U extension header.
15. A method of handover, the method comprising:
the second distribution unit DU receives a request for resource allocation from the central unit CU;
and the DU replies configuration completion information to the CU.
16. The method of claim 15, further comprising:
and the second DU sends the related information of connection reconfiguration completion to the CU.
17. The method of claim 15, further comprising:
the second DU transmits data for the UE to the UE;
the data for the UE includes: data that the UE did not successfully receive from the first DU and new data.
18. The method of claim 15, further comprising:
and the second DU sends the downlink data packet to the UE through an air interface.
19. A first distribution unit, DU, comprising: a processor and a memory for storing a computer program capable of running on the processor;
wherein the processor is adapted to carry out the steps of the method according to any of claims 1-5 when running the computer program.
20. A User Equipment (UE), comprising: a processor and a memory for storing a computer program capable of running on the processor;
wherein the processor is adapted to carry out the steps of the method according to any one of claims 6 to 7 when executing the computer program.
21. A Central Unit (CU), comprising: a processor and a memory for storing a computer program capable of running on the processor;
wherein the processor is adapted to carry out the steps of the method according to any one of claims 8 to 14 when running the computer program.
22. A second distribution unit, DU, comprising: a processor and a memory for storing a computer program capable of running on the processor;
wherein the processor is adapted to carry out the steps of the method of any one of claims 15 to 18 when executing the computer program.
23. A computer storage medium having a computer program stored thereon, wherein the computer program when executed by a processor implements the steps of the method of any of claims 1-5, claims 6-7, claims 8-14, claims 15-18.
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