CN110708720B - Switching method, distribution unit, terminal, concentration unit and computer storage medium - Google Patents

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

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Publication number
CN110708720B
CN110708720B CN201810752888.2A CN201810752888A CN110708720B CN 110708720 B CN110708720 B CN 110708720B CN 201810752888 A CN201810752888 A CN 201810752888A CN 110708720 B CN110708720 B CN 110708720B
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data transmission
data
sends
transmission status
processor
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CN110708720A (en
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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 concentration unit and a computer storage medium, wherein the method comprises the following steps: after a first Distribution Unit (DU) sends a handover related command to a User Equipment (UE), continuing data transmission among a Centralized Unit (CU), the first DU and the UE; and stopping data transmission among the CU, the first DU and the UE when the first DU receives a switching completion instruction sent by the CU.

Description

Switching method, distribution unit, terminal, concentration unit and computer storage medium
Technical Field
The present invention relates to wireless communication technologies, and in particular, to a switching method, a distribution unit, a terminal, a centralized 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, the 3GPP RAN group of 12 months in 2015 starts a 5G scenario and requirement study project, and the 5G scenario and requirement study report passed by the RAN group of 71 clearly indicates the requirement of the 5G access network architecture, wherein the most typical requirement distinguished from the 4G access network is that the access network supports a logical functional division of distributed Remote Units (RU) and Central Units (CU), and supports migration of protocol stack functions between CU and Distributed Units (DU).
A CU is a centralized node that is capable of controlling and coordinating multiple cells, including protocol stack higher layer control and data functions, and possibly some baseband processing functions. The DU is a distributed unit for realizing a radio frequency front end (RRH) function and other baseband processing functions, and the CU and the DU are connected through a forwarding interface. According to the 3gpp RAN3 conclusion, the standardized PDCP-RLC segmentation scheme, i.e. the packet data convergence protocol (Packet Data Convergence Protocol, PDCP) layer and the radio resource control protocol (Radio Resource Control, RRC) layer, will be located in the CU, while the radio link control layer protocol (Radio link Control, RLC), medium access control (Media Access Control, MAC) layer and the physical layer (PHY) layer are located in the DUs.
The ITU defines three general classes of application scenarios for 5G and proposes a key indicator capability that is more challenging than 4G, in terms of air interface (NR), requiring a lossless handover that maintains continuity of traffic when switching inside the NR, i.e. a low or even zero interruption delay.
Each cell under the CU-DU architecture can only be controlled and serviced by one DU. In this way, when a handover from a source cell to a target cell is involved, the terminal needs to do a cell handover across DUs if they are not under the control of the same DU. How to implement lossless switching across DU "zero" interrupt latency inside one CU is a critical 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 to a target eNB, the source eNB directs the UE to initiate a handover procedure to the target eNB in the RRC reconfiguration signaling sent to the UE, and then stops sending downlink data to the UE. Before the synchronization and random access processes are completed to the target base station, the data link between the UE and the network is broken, i.e. the switching requirement of zero interruption delay cannot be satisfied. For this problem, there is no effective solution in the related art.
Disclosure of Invention
In view of the foregoing, embodiments of the present invention wish 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 command related to switching to the UE, continuing data transmission among the CU, the first DU and the UE;
and stopping data transmission among the CU, the first DU and the UE when the first DU receives a switching completion instruction sent by the CU.
In the above scheme, the method further comprises:
the first DU sends a data transmission status for a UE to the CU.
In the above scheme, continuing data transmission among the CU, the first DU and the UE includes:
and the first DU continuously keeps the F1 interface connection with the CU, and the first DU is connected with the air interface of the UE, so that the CU continuously sends data to the DU.
In the above scheme, the switching completion indication is encapsulated by a special message;
or encapsulating the switching completion indication into a non-special 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 status report adopts special message encapsulation;
or, encapsulating the data transmission status report into a non-dedicated F1 interface message;
or, encapsulating the data transmission status report into a data plane GTP-U extension head.
The switching method of the embodiment of the invention comprises the following steps:
the UE receives the connection reconfiguration related information 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 carry out data transmission with the first DU.
In the above scheme, the method further comprises:
the UE sends information about 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 for UE switching based on the related information of the measurement report;
and continuing to perform 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 receiving the information about the measurement report forwarded from the UE via the first DU, the CU sends a UE context setup request to the second DU, and the CU receives a UE context setup request reply fed back by the second DU.
In the above scheme, the method further comprises: after receiving information about a measurement report forwarded from a UE via a first DU, the CU sends a radio resource configuration request to a second DU;
and after receiving a 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:
after receiving the radio resource configuration completion instruction fed back by the second DU, the CU sends information about 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 connection reconfiguration is completed;
the CU sends a handover complete indication to the first DU with 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 connection reconfiguration is completed;
the CU sends a handover complete indication to the first DU with a UE context modification request message.
In the above scheme, the method further comprises:
the CU receives a data transmission status report for a UE sent via the first DU.
In the above scheme, the method further comprises: after receiving the data transmission status report for the UE sent via the first DU, the CU sends feedback of data that the first DU did not successfully receive to the UE via the first DU.
In the above scheme, the method further comprises: after receiving the data transmission status report for the UE sent via the first DU, the CU sends feedback to the UE that the first DU successfully received new data via the first DU.
In the above scheme, the method further comprises:
the CU receives a data transmission status for the UE sent via the first DU;
the CU sends data for the UE to a second DU according to the data transmission condition;
the data for the UE includes: the UE does not successfully receive data from the first DU and new data.
In the above scheme, the switching completion indication is encapsulated by a special message;
or encapsulating the switching completion indication into a non-special 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 status report adopts special message encapsulation;
or, encapsulating the data transmission status report into a non-dedicated F1 interface message;
or, encapsulating the data transmission status report into a data plane GTP-U extension head.
The switching method of the embodiment of the invention comprises the following steps:
the second DU receives a request for resource configuration of the CU;
the DU replies configuration completion information to the CU.
In the above scheme, the method further comprises:
the second DU sends information about completion of connection reconfiguration to the CU.
In the above scheme, the method further comprises:
the second DU sends data for the UE to the UE;
the data for the UE includes: the UE does not successfully receive data 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 schemes when the computer program is run.
The UE of the embodiment of the invention comprises the following steps: 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 schemes when the computer program is run.
The CU 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 schemes when the computer program is run.
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 schemes when the computer program is run.
The computer storage medium of an embodiment of the present invention has a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the method of any of the above aspects.
By adopting the embodiment of the invention, after the first DU sends the command related to the switching to the UE, the data transmission is continued among the CU, the first DU and the UE; and stopping data transmission among the CU, the first DU and the UE when the first DU receives a switching completion instruction sent by the CU. 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 interrupt time delay is met.
Drawings
FIG. 1 is a flow chart of a method of implementing an embodiment of the present invention;
FIG. 2 is a flow chart of a CU-DU architecture zero interrupt latency switch to which embodiments of the present invention are applied;
fig. 3 is another flowchart of a CU-DU architecture zero interrupt latency switch to which embodiments of the present invention are applied.
Detailed Description
The implementation of the technical solution is described in further detail below with reference to the accompanying drawings.
The switching method in the embodiment of the invention, as shown in fig. 1, includes:
and step 101, after a first DU sends a command related to switching to the UE, continuing data transmission among the CU, the first DU and the UE.
Here, the first DU may be a source DU, and after transmitting a handover command (handover command) to the UE, data transmission is continued among the CU, the source DU, and the UE.
Step 102, stopping data transmission among the CU, the first DU and the UE when the first DU receives a handover complete instruction sent by the CU.
Here, the first DU may be a source DU, and the second DU may be a target DU, and when the source DU receives a handover complete indication (indicated as handover complete) transmitted by the CU, data transmission between the CU, the first DU and the UE is stopped.
In one practical application, after the source DU sends a command related to the handover to the UE, data transmission with the CU and the UE is continued until the UE successfully accesses the target DU and the CU sends an indication of completion of the handover to the source DU, the CU, the source DU and the UE stop data transmission, the source DU sends a data transmission condition for the UE to the CU, the CU sends data for the UE to the target DU according to the data transmission condition of the source DU for the UE, and continuity of data transmission for the UE is ensured while implementing handover across DUs.
In an embodiment of the present invention, the first DU sends a data transmission status for a UE to the CU, so that the CU sends data for the UE to a second DU according to the data transmission status of the first DU for the UE.
In an embodiment of the present invention, continuing data transmission among the CU, the first DU and the UE includes: and the first DU continuously keeps the F1 interface connection with the CU, and the first DU is connected with the air interface of the UE, so that the CU continuously sends data to the DU. For the F1 interface, the CU and the DU are connected through the F1 interface.
In one practical application, after the source DU sends the handover command to the UE, the CU continues to keep 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 complete indication is encapsulated by a special message. Or encapsulating the switching completion indication into a non-special F1 interface message.
In one practical application, the CU sends an indication of handover complete to the source DU informing the source DU to stop sending data to the UE, either using a dedicated message or encapsulating the indication IE into a non-dedicated F1 interface message.
In an embodiment of the present invention, the data transmission status is sent in the form of a data transmission status report; the data transmission status report adopts special message encapsulation; or, encapsulating the data transmission status report into a non-dedicated F1 interface message; or, encapsulating the data transmission status report into a data plane GTP-U extension head.
In one practical application, the source DU sends a data transmission status report to the CU, which may use either a dedicated message or an indication IE encapsulated to a non-dedicated F1 interface message, or encapsulated in a data plane GTP-U extension header.
The embodiment of the invention is suitable for a brand-new CU-DU architecture in 5G, especially for a scene of inter-DU switching in CU, and can realize switching of zero interrupt delay. And the method does not depend on the double transceiving of the terminal, but coordinates the time of establishing and interrupting the connection between two DUs and the user through the CU, thereby ensuring that the user data is not interrupted. Including but not limited to the following core content:
1. the source DU forwards the 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 to the CU that the handover preparation work is completed;
4. the CU sends RRC connection reconfiguration information to the UE through the source DU;
5. the UE initiates random access to the target DU and continues to interact data with the source DU;
6. after confirming that the RRC connection reconfiguration is completed, the CU stops sending data to the source DU;
7. the CU sends a switching completion message to the source DU, and the source DU stops sending data to the UE;
8. the source DU replies the CU with the status of sending data to the UE;
9. the CU sends to the target DU data that the UE did not successfully receive from the source DU, as well as new data.
The core points described above are specifically set forth in the following examples.
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), so that the first DU forwards the related information of the measurement report to the CU; and the UE receives a handover related command (such as a handover command) sent by the DU, and the CU makes a decision for switching the UE based on the related information of the measurement report. And continuing to perform data transmission among the CU, the first DU and the UE until the first DU receives a switching completion instruction (such as handover complete instruction) 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: the UE receives information about connection reconfiguration (e.g., RRC connection reconfiguration information) transmitted 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 carry out data transmission with the first DU.
In an implementation manner of the embodiment of the present invention, the method further includes: and the UE transmits the information related to the connection reconfiguration to the CU through the second DU, so that the CU terminates transmitting a downlink data packet to the first DU.
The switching method of the embodiment of the invention comprises the following steps:
the CU receives information about measurement reports (e.g., measurement reports of the UE) forwarded from the UE via a first DU (e.g., source DU). The CU makes a decision to switch the UE based on the information about the measurement report. And continuing to perform data transmission among the CU, the first DU and the UE until the first DU receives a switching completion instruction (handover complete instruction) 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 establishing the UE context and configuring the wireless resource to a second DU, so that the second DU establishes the corresponding UE context and configures the wireless resource according to the information in the request.
In an implementation manner of the embodiment of the present invention, the method further includes: after receiving the radio resource configuration completion instruction sent by the DU, the CU sends connection reconfiguration related information (such as RRC connection reconfiguration information) to the UE through the first DU, so that the UE initiates random access to the second DU according to the connection reconfiguration related information.
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 connection reconfiguration is completed; the CU sends a handover complete indication (handover complete indication) to the first DU, stopping the first DU from sending data to the UE.
In an implementation manner of the embodiment of the present invention, the method further includes: the CU receives a data transmission status for the UE sent via the first DU; the CU sends data for the UE to a second DU according to the data transmission condition; the data for the UE includes: the UE does not successfully receive data from the first DU and new data.
In an embodiment of the present invention, the handover complete indication is encapsulated by a special message. Or encapsulating the switching completion indication into a non-special F1 interface message.
In one practical application, the CU sends an indication of handover complete to the source DU informing the source DU to stop sending data to the UE, either using a dedicated message or encapsulating the indication IE into a non-dedicated F1 interface message.
In an embodiment of the present invention, the data transmission status is sent in the form of a data transmission status report. The data transmission status report adopts special message encapsulation; or, encapsulating the data transmission status report into a non-dedicated F1 interface message; or, encapsulating the data transmission status report into a data plane GTP-U extension head.
In one practical application, a CU receives a data transmission status report sent by a source DU, where the status report may use a dedicated message, or may encapsulate an indication IE into a non-dedicated F1 interface message, or may encapsulate the indication IE into a data plane GTP-U extension header.
The switching method of the embodiment of the invention comprises the following steps:
after the second DU makes a decision to switch the UE based on the information about the UE forwarding the measurement report via the first DU, the second DU continues data transmission among the CU, the first DU and the UE until the first DU receives a switch completion instruction (handover complete instruction) sent by the CU, and stops data transmission among the CU, the first DU and the UE.
In an embodiment of the present invention, the second DU receives a request for resource allocation of the CU; 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 for establishing a UE context and configuring radio resources, which are sent by the CU; and the second DU establishes 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 confirming that the second DU has completed the handoff preparation.
In an implementation manner of the embodiment of the present invention, the method further includes: the second DU sends information about connection reconfiguration complete (e.g., RRC reconfiguration complete signaling) to the CU to inform 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 sends data for the UE to the UE; the data for the UE includes: the UE does not successfully receive data 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.
Application scenario one: the CU sends a handover complete notification indication to the source DU, which uses dedicated messaging.
The specific flow is shown in fig. 2, and comprises the following steps:
step 201, the UE sends information about 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 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.
Step 204, the target DU sends a response, such as a UE context setup request reply, to the CU to confirm that the target DU has completed the handover preparation.
Step 205, the CU sends the RRC connection reconfiguration information to the UE via the source base station.
Step 206, according to the RRC connection reconfiguration information, the UE performs random access to the target DU, and at the same time, the UE continues to perform data interaction with the source DU.
Step 207, after the UE sends the RRC reconfiguration complete signaling to the CU through the target DU, the CU terminates sending the downlink packet to the source DU.
Step 208, the CU sends a handover complete notification indication to the source DU, which uses dedicated messaging, at which point the source DU stops sending packets to the UE.
Step 209, the source DU replies to the CU with a current downstream data status report containing the Sequence Number (SN) of the failed Packet Data Convergence Protocol (PDCP). Wherein the status report is transmitted in the data plane GTP-U extension header. Alternatively, the status report is transmitted to the CU using dedicated signaling.
Step 210, the CU sends to the target DU the PDCP packets and the new downstream PDCP packets 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 the air interface.
It should be noted that: the network element device types of the source DU and the target DU may be base stations, i.e. the source DU may be a source base station and the target DU may be a target base station.
And (2) an application scene II: the CU sends a handover complete notification indication to the source DU, which indication is encapsulated in a non-dedicated F1 interface message for delivery.
The specific flow is shown in fig. 3, and comprises the following steps:
step 301, the UE sends information about the RRC measurement report to the source DU.
In 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 content related to the RRC measurement report.
And 303, the CU sends a request for F1UE Context establishment and DRB configuration to the target DU, and the target DU establishes a corresponding UE Context and configures wireless resources according to the information in the request.
Step 304, the target DU sends a response, such as a UE context setup request reply, to the CU to confirm that the target DU has completed the handover preparation.
Step 305, CU sends RRC connection reconfiguration information to the UE via the source base station.
Step 306, according to the RRC connection reconfiguration information, the UE performs random access to the target DU, and at the same time, continues to perform data interaction with the source DU.
Step 307, after the UE sends the RRC reconfiguration complete signaling to the CU through the target DU, the CU terminates sending the downlink packet to the source DU.
Step 308, the CU sends a handover complete notification indication to the source DU, where the indication is encapsulated in a non-dedicated F1 interface message, and the source DU stops sending packets to the UE.
Step 309, the source DU replies to the CU a current downlink data status report, including SN numbers of the PDCP that were not successfully transmitted. Wherein the status report IE is encapsulated into a non-dedicated F1 interface message. Alternatively, the status report is transmitted to the CU using dedicated signaling. Or, the CU sends the PDCP data packet which is not successfully received by the UE from the source DU and the new downlink PDCP data packet to the target DU.
Step 310, the target DU sends the downlink data packet to the UE through the air interface.
It should be noted that: the network element device types of the source DU and the target DU may be base stations, i.e. the source DU may be a source base station and the target DU may be a target base station.
A first DU 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 according to any of the above embodiments when the computer program is run.
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 according to any of the above embodiments when the computer program is run.
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 according to any of the above embodiments when the computer program is run.
A second DU 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 according to any of the above embodiments when the computer program is run.
A computer storage medium of an embodiment of the invention has stored thereon a computer program, wherein the computer program when executed by a processor implements the steps of the method of any of the above embodiments.
The integrated modules of the embodiments of the present invention may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product. Based on such understanding, the technical solutions of the embodiments of the present invention may be embodied in essence or a part contributing to the prior art in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) 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, random Access Memory), a magnetic disk, or an optical disk, or 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 foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention.

Claims (15)

1. A method of handover, the method comprising:
after a first distribution unit DU sends a command related to switching to User Equipment (UE), continuing data transmission among a centralized unit CU, the first DU and the UE; the command related to the handover is a decision made by the CU to handover the UE based on information related to a measurement report of the UE;
and stopping data transmission among the CU, the first DU and the UE when the first DU receives a switching completion instruction sent by the CU.
2. The method according to claim 1, wherein the method further comprises:
the first DU sends a data transmission status for a UE to the CU.
3. The method of claim 1, wherein continuing data transmission between the CU, the first DU and the UE comprises:
and the first DU continuously keeps the F1 interface connection with the CU, and the first DU is connected with the air interface of the UE, so that the CU continuously sends data to the DU.
4. A method according to any of claims 1 to 3, characterized in that the handover complete indication is encapsulated with a special message;
or encapsulating the switching completion indication into a non-special F1 interface message.
5. The method according to claim 2, wherein the data transmission status is sent in the form of a data transmission status report;
the data transmission status report adopts special message encapsulation;
or, encapsulating the data transmission status report into a non-dedicated F1 interface message;
or, encapsulating the data transmission status report into a data plane GTP-U extension head.
6. A method of handover, the method comprising:
the centralization unit CU receives information about measurement reports forwarded from the UE via the first distribution unit DU;
the CU makes a decision for UE switching based on the related information of the measurement report;
and continuing to perform 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.
7. The method of claim 6, wherein the method further comprises:
the CU sends a request for UE context establishment and radio resource configuration to a second DU.
8. The method of claim 6, wherein the method further comprises:
after receiving the radio resource configuration completion instruction sent by the second DU, the CU sends information about connection reconfiguration to the UE through the first DU.
9. The method of claim 6, wherein the method further comprises:
stopping sending data to the first DU after the CU confirms that connection reconfiguration is completed;
the CU sends a handover complete indication to the first DU.
10. The method of claim 6, wherein the method further comprises:
the CU receives a data transmission status for the UE sent via the first DU;
the CU sends data for the UE to a second DU according to the data transmission condition;
the data for the UE includes: the UE does not successfully receive data from the first DU and new data.
11. The method of claim 6, wherein the handover complete indication is encapsulated with a specialized message;
or encapsulating the switching completion indication into a non-special F1 interface message.
12. The method according to claim 10, wherein the data transmission status is sent in the form of a data transmission status report;
the data transmission status report adopts special message encapsulation;
or, encapsulating the data transmission status report into a non-dedicated F1 interface message;
or, encapsulating the data transmission status report into a data plane GTP-U extension head.
13. 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 implement the steps of the method of any of claims 1-5 when the computer program is run.
14. A central unit CU, characterized by comprising: a processor and a memory for storing a computer program capable of running on the processor;
wherein the processor is adapted to implement the steps of the method of any of claims 6-12 when the computer program is run.
15. A computer storage medium having stored thereon a computer program, wherein the computer program when executed by a processor realizes the steps of the method of any of claims 1-5, 6-12.
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Family Cites Families (4)

* Cited by examiner, † Cited by third party
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CN107889172A (en) * 2016-09-29 2018-04-06 中兴通讯股份有限公司 The method, apparatus and system of cell switching

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
CATT.R3-182351 "CR to 38.401 on DL user data to DU".3GPP tsg_ran\WG3_Iu.(第TSGR3_99bis期),全文. *
Huawei.R3-171227 "Analysis of the latency between CU and DU".3GPP tsg_ran\WG3_Iu.(第TSGR3_95bis期),全文. *

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