CN112654069A - Non-independent networking switching method and network side equipment - Google Patents
Non-independent networking switching method and network side equipment Download PDFInfo
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Abstract
The invention provides a non-independent networking switching method and network side equipment, and belongs to the technical field of wireless communication. One of the methods comprises: and after the target main node is successfully switched, the source main node indicates the source auxiliary node to disconnect the user plane data transmission and delete the RRC connection of the source auxiliary node. The other method comprises the following steps: and the source main node sends the related information of the RRC load of the source auxiliary node side to the target main node. The invention can reduce the user plane time delay during the switching of the non-independent networking and improve the user experience.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a non-independent network switching method and a network device.
Background
A Non-independent Networking System (NSA) may use two handover methods, one is handover with an auxiliary Node (SN), and the other is handover without an SN. Referring to fig. 1, the main procedures of handover are described below with a Master Node (MN) as an eNB (4G base station), a secondary Node as a gbb (5G base station), and a Core Network as an Evolved packet switched Core Network (EPC):
1. a source master node (source MN) sends a Handover Request (Handover Request) message to a target master node (target MN).
2. The target MN sends a secondary node Addition Request (e.g., SgNB Addition Request) message to the target SN.
3. The target SN sends a secondary node Addition Request acknowledgement feedback (e.g., SgNB Addition Request Ack) message to the target MN.
4. The target MN sends a Handover Request acknowledgement feedback (Handover Request Acknowledge) message to the source MN.
Source MN sends a secondary node Release Request (e.g. SgNB Release Request) message to the source SN.
And 5b, the source SN sends a secondary node Release Request acknowledgement feedback (such as an SgNB Release Request acknowledgement) message to the source MN.
6. The source MN transmits a Radio Resource Control connection reconfiguration (RRCConnectionReconfiguration, where RRC: Radio Resource Control) message to a terminal (User Equipment, UE).
7. And a Random Access Procedure (Random Access Procedure) is carried out between the terminal and the target MN.
8. The terminal transmits an RRC connection reconfiguration complete (rrcconnectionreconfiguration complete) message to the target MN. So far, the MN handover is successful.
9. And carrying out a random access process between the terminal and the target SN.
10. The target MN sends a secondary node Reconfiguration Complete (SgNB Reconfiguration Complete) message to the target SN.
The source SN sends a Secondary radio access Data Usage Report (Secondary RAT Data Usage Report) to the source MN.
Source MN forwards secondary wireless access data usage reports to Mobility Management Entity (MME).
12. The source MN sends SN Status Transfer (SN Status Transfer) information to the target MN.
13. A Serving Gateway (S-GW) initiates Data Forwarding.
14. The target MN sends Path Switch Request (Path Switch Request) information to the MME.
And 15, carrying out a Bearer Modification procedure (Bearer Modification) between the S-GW and the MME.
New Path between S-GW and target MN (MN final bearer) is established 16a.
New Path (SN final bearer) between S-GW and target SN is established 16b.
The MME sends a Path switch Request acknowledgement feedback (Path switch Request acknowledgement) message to the target MN.
18. The target MN sends a terminal Context Release (UE Context Release) message to the source MN.
19. The source MN sends a terminal context release message to the source SN.
When switching with SN, the source SN and the target SN are the same SN.
Currently, the SN-side user plane data transmission is disconnected at the beginning of the handover procedure, for example, the SN-side user plane data transmission is instructed to be disconnected in the secondary node release request message in step 5a, which results in the user plane data being reduced from several hundred megabits (Mbps) to 0 bit rate. After the target MN completes adding the SN in step 12, the SN data bearer can be reconstructed, and the end user plane data transmission is recovered. The interval between step 5a and step 12 can be more than 500 milliseconds (ms), so that the link loss of the data transmission of the terminal user plane can cause the increase of the time delay and influence the user experience, especially the user experience of low-time delay and high-speed service is greatly influenced.
Disclosure of Invention
In view of this, the present invention provides a non-independent network switching method and a network side device, which are used to solve the problem that user experience is affected by an increase in user plane data transmission delay caused by the current MN switching process.
In order to solve the above technical problem, in a first aspect, the present invention provides a non-independent network switching method, including:
after the target main node is successfully switched, the source main node indicates the source auxiliary node to disconnect the user plane data transmission and deletes the RRC connection of the source auxiliary node; alternatively, the first and second electrodes may be,
and the source main node sends the related information of the RRC load of the source auxiliary node side to the target main node.
Optionally, the step of instructing, by the source master node, the source secondary node to disconnect the user plane data transmission and delete the RRC connection of the source secondary node after the target master node is successfully switched includes:
and the source main node is successfully switched on the target main node, and the target main node determines the target auxiliary node, and then instructs the source auxiliary node to disconnect the user plane data transmission and delete the RRC connection of the source auxiliary node.
In a second aspect, the present invention provides a non-independent network switching method, including:
the target main node receives related information of RRC load of a source auxiliary node side, which is sent by a source main node;
and the target main node determines the source auxiliary node as a target auxiliary node so as to maintain the RRC connection between the source auxiliary node and the terminal.
Optionally, the method further comprises at least one of the following steps:
the target main node acquires a control plane bearer through an RRC reconfiguration message between the target main node and the terminal;
the target main node updates the secret key through RRC reconfiguration information between the target main node and the terminal;
and the target main node instructs the target auxiliary node to update the secret key through RRC reconfiguration information between the target auxiliary node and the terminal.
In a third aspect, the present invention provides a non-independent network switching method, including:
after the target main node is successfully switched, the source auxiliary node disconnects the user plane data transmission and deletes the RRC connection according to the indication of the source main node; alternatively, the first and second electrodes may be,
in the handover process, the source secondary node serves as a target secondary node to maintain the RRC connection with the terminal.
Optionally, after the target master node is successfully switched, the step of disconnecting the user plane data transmission and deleting the RRC connection by the source secondary node according to the indication of the source master node includes:
and the source auxiliary node is successfully switched on the target main node, and after the target main node determines the target auxiliary node, the user plane data transmission is disconnected and the RRC connection is deleted according to the indication of the source main node.
Optionally, the source auxiliary node and the target auxiliary node are the same node.
In a fourth aspect, the present invention further provides a network side device, including:
the indication module is used for indicating the source auxiliary node to disconnect the user plane data transmission and delete the RRC connection of the source auxiliary node after the target main node is successfully switched; alternatively, the first and second electrodes may be,
and the sending module is used for sending the related information of the RRC load of the source auxiliary node side to the target main node.
Optionally, the indicating module is configured to, after the target master node is successfully switched and the target master node determines the target secondary node, indicate the source secondary node to disconnect the user plane data transmission and delete the RRC connection of the source secondary node.
In a fifth aspect, the present invention further provides a network side device, including:
the receiving module is used for receiving related information of the RRC load of the source auxiliary node side, which is sent by the source main node;
a determining module, configured to determine that the source-secondary node is a target-secondary node, so as to maintain an RRC connection between the source-secondary node and a terminal.
Optionally, the network side device further includes at least one of:
the control plane bearer updating module is used for acquiring a control plane bearer through an RRC reconfiguration message between the control plane bearer updating module and the terminal;
the first secret key updating module is used for updating the secret key through an RRC reconfiguration message between the first secret key updating module and the terminal;
and the second secret key updating module is used for indicating the target auxiliary node to update the secret key through the RRC reconfiguration message between the target auxiliary node and the terminal.
In a sixth aspect, the present invention further provides a network side device, including:
the disconnection and deletion module is used for disconnecting the user plane data transmission and deleting the RRC connection according to the indication of the source main node after the target main node is successfully switched; alternatively, the first and second electrodes may be,
and the maintaining module is used for maintaining the RRC connection with the terminal in the switching process.
Optionally, the disconnection and deletion module is configured to, after the target master node is successfully switched and the target master node determines the target secondary node, disconnect the user plane data transmission and delete the RRC connection according to the instruction of the source master node.
Optionally, the source auxiliary node and the target auxiliary node are the same node.
In a seventh aspect, the present invention further provides a network side device, including: a transceiver and a processor;
the transceiver is used for indicating the source auxiliary node to disconnect the user plane data transmission and deleting the RRC connection of the source auxiliary node after the target main node is successfully switched; alternatively, the first and second electrodes may be,
and the transceiver is used for sending the related information of the RRC load of the source auxiliary node side to the target main node.
Optionally, the transceiver is configured to instruct the source secondary node to disconnect the user plane data transmission and delete the RRC connection of the source secondary node after the target primary node is successfully switched and the target primary node determines the target secondary node.
In an eighth aspect, the present invention further provides a network side device, including: a transceiver and a processor;
the transceiver is used for receiving related information of RRC load-bearing at the source auxiliary node side sent by the source main node;
the processor is configured to determine that the source secondary node is a target secondary node, so as to maintain RRC connection between the source secondary node and a terminal.
Optionally, the transceiver is further configured to acquire a control plane bearer through an RRC reconfiguration message with the terminal; and/or the presence of a gas in the gas,
the transceiver is further configured to update the key through an RRC reconfiguration message with the terminal; and/or the presence of a gas in the gas,
the transceiver is further configured to instruct the target secondary node to update the key through an RRC reconfiguration message with the terminal.
In a ninth aspect, the present invention further provides a network side device, including: a transceiver and a processor;
the processor is used for disconnecting the user plane data transmission and deleting the RRC connection according to the indication of the source main node after the target main node is successfully switched; alternatively, the first and second electrodes may be,
the processor is configured to maintain an RRC connection with the terminal during the handover.
Optionally, the processor is configured to, after the target master node is successfully switched and the target master node determines the target secondary node, disconnect the user plane data transmission and delete the RRC connection according to the instruction of the source master node.
Optionally, the source auxiliary node and the target auxiliary node are the same node.
In a tenth aspect, the present invention further provides a network-side device, including a memory, a processor, and a computer program stored in the memory and executable on the processor; the processor implements the steps of any of the above-described non-independent network switching methods when executing the computer program.
In an eleventh aspect, the present invention further provides a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements the steps in any of the above-mentioned non-independent network switching methods.
The technical scheme of the invention has the following beneficial effects:
in the embodiment of the invention, the source SN is indicated to disconnect the user plane data transmission and delete the RRC connection of the SN under the source MN after the target MN is successfully switched, so that the user plane data can be transmitted before the MN is successfully switched. Compared with the mode of disconnecting the user plane data transmission when the MN is switched, the time delay of more than 100 milliseconds can be reduced, namely the user plane time delay (also called as pit dropping time delay) can be reduced from more than 500 milliseconds to more than 300 milliseconds, and the user experience is improved.
In the embodiment of the invention, the source master node does not immediately indicate the source SN to disconnect the user plane data transmission and delete the RRC connection of the source auxiliary node after the target master node is switched, but indicates the source SN to disconnect the user plane data transmission and delete the RRC connection of the source auxiliary node after the target master node determines the target auxiliary node, thereby further reducing the user plane time delay.
In the embodiment of the invention, the source main node does not instruct the source auxiliary node to delete the RRC connection in the whole switching process, namely the source SN always keeps the RRC connection, and the source MN transmits the related information of the RRC bearing at the source SN side to the target MN, so that the SN air interface and the bearing information are unchanged after the MN is successfully switched. Compared with the scheme that the source SN disconnects the RRC connection of the user plane after the MN is switched, and then the terminal initiates the RRC connection establishment process of the SN again, the method can further reduce the time delay of the user plane.
Drawings
Fig. 1 is a schematic diagram of MN handoff procedure with or without SN;
fig. 2 is a flowchart illustrating a non-independent network switching method according to a first embodiment of the present invention;
fig. 3 is a schematic diagram of a user plane bearer and a control plane bearer in an embodiment of the present invention;
fig. 4 is a schematic flow chart of SN adding after MN handover is successful;
fig. 5 is a flowchart illustrating a non-independent network switching method according to a second embodiment of the present invention;
fig. 6 is a flowchart illustrating a non-independent network switching method according to a third embodiment of the present invention;
fig. 7 is a flowchart illustrating a non-independent network switching method according to a fourth embodiment of the present invention;
fig. 8 is a flowchart illustrating a non-independent network switching method according to a fifth embodiment of the present invention;
fig. 9 is a schematic structural diagram of a network-side device in a sixth embodiment of the present invention;
fig. 10 is a schematic structural diagram of a network-side device in a seventh embodiment of the present invention;
fig. 11 is a schematic structural diagram of a network-side device in an eighth embodiment of the present invention;
fig. 12 is a schematic structural diagram of a network-side device in a ninth embodiment of the present invention;
fig. 13 is a schematic structural diagram of a network-side device in a tenth embodiment of the present invention;
fig. 14 is a schematic structural diagram of a network-side device in an eleventh embodiment of the present invention;
fig. 15 is a schematic structural diagram of a network-side device in a twelfth embodiment of the present invention;
fig. 16 is a schematic structural diagram of a network-side device in a thirteenth embodiment of the present invention;
fig. 17 is a schematic structural diagram of a network-side device in a fourteenth embodiment of the present invention;
fig. 18 is a schematic structural diagram of a network-side device in fifteen embodiments of the present invention;
fig. 19 is a schematic structural diagram of a network-side device in a sixteenth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
Referring to fig. 2, fig. 2 is a schematic flow chart of a non-independent network switching method according to an embodiment of the present invention, including the following steps:
step 201: and after the target main node is successfully switched, the source main node indicates the source auxiliary node to disconnect the user plane data transmission and delete the RRC connection of the source auxiliary node.
It should be noted that the source primary node may be a fourth generation mobile communication technology (4G) base station (eNB), and the source secondary node may be a fifth generation mobile communication technology (5G) base station (gNB) or an evolved 5G base station (en-gNB). Alternatively, the source primary node may be a gNB and the source secondary node may be an eNB or an evolved 4G base station (ng-eNB). Of course, this is only an example and is not a limitation to the embodiment of the present invention, and the source master node may also be another evolved node b, and the source slave node may also be another evolved node b.
In the embodiment of the invention, the source MN can use a message to indicate to the source SN to disconnect the user plane data transmission and delete the RRC connection at the SN side under the source MN. Alternatively, the source MN may use two messages to indicate to the source SN to disconnect the user plane data transmission and delete the RRC connection on the SN side under the source MN, for example, first send first indication information to the source-secondary node, where the first indication information is used to indicate to disconnect the user plane data transmission, and then send second indication information to the source-secondary node, where the second indication information is used to indicate to delete the RRC connection on the SN side under the source MN.
In the prior art, the first indication information is carried in the secondary node release request message in step 5a in fig. 1, and the second indication information is carried in the RRC connection reconfiguration message in step 6 in fig. 1. The second indication information may specifically be an en-dc releaseeadd r15 message. However, in the embodiment of the present invention, the secondary node release request message in step 5a in fig. 1 does not carry the first indication information, and the RRC connection reconfiguration message in step 6 does not carry the second indication information, which may be specifically configured to set an en-dc releaselanded r15 message in the RRC connection reconfiguration message to false. That is, different from the prior art, the embodiment of the present invention does not disconnect the user plane data transmission and also does not delete the user plane RRC information of the source SN before the MN is successfully switched, and the source SN also does not issue the terminal RRC release message, that is, does not delete the RRC connection of the source SN, but maintains the user plane information of the source SN, and continuously transmits the user plane data on the source SN side.
In the embodiment of the invention, the source MN indicates the source SN to disconnect the user plane data transmission and delete the RRC connection of the SN under the source MN after the target MN is successfully switched, namely, the source MN does not delete the source SN bearing and the RRC connection at first during the switching, so that the user plane data can be transmitted before the MN is successfully switched. Compared with the mode of disconnecting the user plane data transmission when the MN is switched, the time delay of more than 100 milliseconds can be reduced, namely the user plane time delay (also called as pit dropping time delay) can be reduced from more than 500 milliseconds to more than 300 milliseconds, and the user experience is improved.
The embodiment of the invention is particularly suitable for the NSA networking non-shunting scene. This is because: in a non-shunting scenario, SN user plane Data transmission is theoretically related to only key update and user plane Bearer (i.e., Data Radio Bearer (DRB)) change, and is not related to MN control plane Bearer, MN control plane change does not affect SN user plane Data transmission, and before MN handover is successful, SN key and SN user plane Bearer do not change. That is, as shown in fig. 3, in the NSA non-offload scenario, the control plane bearer is switched from the source MN to the target MN, but the user plane bearer is still from the core network (e.g., EPC) to the terminal via the source SN, so that the user plane data can still be transmitted during the MN switching process.
Specifically, after the handover is successful, the target MN sends indication information indicating that the handover of the target MN is successful to the source MN.
Referring to fig. 4, the following illustrates a specific flow of adding SNs after the MN handover is successful in the MN handover process:
1. the random access process of the terminal accessing the target MN is as follows: the terminal sends a random access Preamble (MSG1: RA Preamble) to the target MN.
2. The random access process of the terminal accessing the target MN is as follows: the target MN sends a random access Response (MSG2: RA Response) message to the terminal.
3. The random access process of the terminal accessing the target MN is as follows: the terminal sends an RRC connection request (MSG3: RRCConnectionRequest) message to the target MN.
4. The random access process of the terminal accessing the target MN is as follows: the target MN sends an RRC connection setup (MSG4: RRCConnectionSetup) message to the terminal.
5. The random access process of the terminal accessing the target MN is as follows: the terminal sends an RRC connection complete (MSG5: RRCConnectionComplete) message containing an attach request (AttachRequest) message, a packet data network connection request (pdnconnectionrequest) message to the target MN.
It should be noted that after the random access procedure is completed, it indicates that the MN is successfully handed over.
6. The target MN sends an Initial terminal message (Initial UE message) to the MME.
The MME sends an Initial Context Setup Request (Initial Context Setup Request) message to the target MN.
13. The target MN sends a security mode command (SecurityModeCommand) message to the terminal.
14. The terminal transmits a security mode complete (SecurityModeComplete) message to the target MN.
15. The target MN sends an RRC connection reconfiguration (RRCConnectionReconfiguration) message to the terminal, and the message is mainly used for sending 5G measurement and control information.
16. The terminal transmits an RRC connection reconfiguration complete (rrcconnectionreconfiguration complete) message to the target MN.
17. The target MN sends an Initial Context Setup Response (Initial Context Setup Response) message to the MME.
An uplink information transfer (ULInformationTransfer) (terminal to target MN).
UPLINK non-access stratum message Transport (UPLINK NAS Transport) (target MN towards MME).
20. The terminal sends a measurement report (MeasurementReport) to the target MN.
21. The target MN sends a secondary node Addition Request (SgNB Addition Request) message to the target SN.
22. The target SN sends a secondary node Addition Request acknowledgement feedback (SgNB Addition Request acknowledgement) message to the target MN.
23. The target MN issues an RRC connection reconfiguration (RRCConnectionReconfiguration) message to the terminal, which is mainly used to add the SN.
24. The terminal transmits an RRC connection reconfiguration complete (rrcconnectionreconfiguration complete) message to the target MN.
25. The target MN sends a secondary node reconfiguration Complete (SgNBReconfiguration Complete) message to the target SN.
26. And the terminal accesses the random access process of the target SN.
(target MN towards target SN) secondary node state Transfer (SN Status Transfer).
(S-GW → target MN → target SN) Data Forwarding (Data Forwarding).
29. Path updating process: the target MN sends an evolved radio access bearer Modification Indication (E-RAB Modification Indication) message to the MME.
30. Path updating process: bearer Modification (Bearer Modification) procedure between S-GW and MME.
31. Path updating process: the S-GW sends an End Marker Packet (End Marker Packet) to the target MN, and the target MN forwards the End Marker Packet to the target SN.
32. Path updating process: the target MN sends an evolved radio access bearer Modification acknowledgement (E-RAB Modification configuration) message to the MME.
In an optional specific embodiment, the step of instructing, by the source master node, the source secondary node to disconnect the user plane data transmission and delete the RRC connection of the source secondary node after the target master node is successfully switched includes:
and the source main node is successfully switched on the target main node, and the target main node determines the target auxiliary node, and then instructs the source auxiliary node to disconnect the user plane data transmission and delete the RRC connection of the source auxiliary node.
In the embodiment of the invention, the source main node does not immediately indicate the source SN to disconnect the user plane data transmission and delete the RRC connection of the source auxiliary node after the target main node is switched, but indicates the source SN to disconnect the user plane data transmission and delete the RRC connection of the source auxiliary node after the target main node determines the target auxiliary node. Taking fig. 4 as an example, the source master node according to the technical solution provided in the embodiment of the present invention does not immediately send an indication after step 5(RRC connection complete), but waits until step 20 before sending to the source SN. After step 20, the target MN can determine the target SN from the measurement report of the terminal. That is, from step 6 to step 20, the user plane data can still be transmitted, so that the user plane delay can be further reduced (approximately 100 milliseconds can be saved).
Referring to fig. 5, fig. 5 is a flowchart illustrating a non-independent network switching method according to a second embodiment of the present invention, including the following steps:
step 501: and after the target main node is successfully switched, the source auxiliary node disconnects the user plane data transmission and deletes the RRC connection according to the indication of the source main node.
It should be noted that the target primary node and the source primary node may be enbs, and the source secondary node may be a gNB or an en-gNB. Alternatively, the target primary node and the source primary node may be a gNB, and the source secondary node may be an eNB or an ng-eNB. Of course, this is only an example and is not a limitation to the embodiments of the present invention, and the target master node and the source master node may also be other evolved node bs, and the source secondary node may also be other evolved node bs.
In the embodiment of the invention, the source auxiliary node receives the indication that the source main node disconnects the user plane data transmission and deletes the RRC connection after the target main node is successfully switched, so that the user plane data can be transmitted before MN switching is successful. Compared with the mode of disconnecting the user plane data transmission when the MN is switched, the time delay of more than 100 milliseconds can be reduced, namely the user plane time delay (also called as pit dropping time delay) can be reduced from more than 500 milliseconds to more than 300 milliseconds, and the user experience is improved. The embodiment of the invention is particularly suitable for the NSA networking non-shunting scene.
Further optionally, after the target master node is successfully switched, the step of disconnecting the user plane data transmission and deleting the RRC connection by the source secondary node according to the indication of the source master node includes:
and the source auxiliary node is successfully switched on the target main node, and after the target main node determines the target auxiliary node, the user plane data transmission is disconnected and the RRC connection is deleted according to the indication of the source main node.
In the embodiment of the invention, the source auxiliary node does not immediately disconnect the user plane data transmission and delete the RRC connection after the target main node is switched, but disconnects the user plane data transmission and deletes the RRC connection after the target main node determines the target auxiliary node. Taking fig. 4 as an example, the technical solution provided in the embodiment of the present invention does not disconnect the user plane data transmission and delete the RRC connection immediately after step 5(RRC connection complete), but disconnects the user plane data transmission and deletes the RRC connection after step 20. After step 20, the target MN can determine the target SN from the measurement report of the terminal. That is, from step 6 to step 20, the user plane data can still be transmitted, so that the user plane delay can be further reduced.
In addition, after the source secondary node deletes the RRC connection and the target secondary node is determined, the terminal needs to initiate an RRC reestablishment procedure to establish the RRC connection with the target secondary node, that is, the terminal needs to reinitiate an RRC connection establishment request of the SN to add the RRC connection under the target MN and the target SN. For example, the target MN can complete the addition of the target SN through steps 21 and 22 in fig. 4, and then notify the terminal of the target SN that needs to be accessed through steps 23 and 24. The target SN may establish an RRC connection with the terminal through step 26 in fig. 4, i.e., a random access procedure initiated by the terminal.
Optionally, the source secondary node and the target secondary node may be the same node, that is, the handover method provided in the embodiment of the present invention may be handover with an SN.
The embodiments of the present invention provide technical solutions corresponding to the above embodiments and having the same inventive concept, and can achieve the same technical effects.
Referring to fig. 6, fig. 6 is a schematic flow chart of a non-independent network switching method according to a third embodiment of the present invention, including the following steps:
step 601: and the source main node sends the related information of the RRC load of the source auxiliary node side to the target main node.
It should be noted that the source primary node and the target primary node may be enbs, and the source secondary node may be a gNB or an en-gNB. Alternatively, the source primary node and the target primary node may be a gNB, and the source secondary node may be an eNB or an ng-eNB. Of course, this is only an example and is not a limitation to the embodiments of the present invention, and the source primary node and the target primary node may also be other evolved node bs, and the source secondary node may also be other evolved node bs.
In the embodiment of the invention, the source main node does not indicate the source auxiliary node to delete the RRC connection in the whole switching process.
As shown in fig. 3, in the scenario of no offloading in NSA networking, both the RRC connection of the SN user plane data interface and the network side bearer are unrelated to the MN. Therefore, when the MN is switched, the source MN can not indicate to delete the RRC connection of the SN under the source MN so as to keep the transmission of the user plane data and reduce the user plane time delay. Then, after the MN is successfully switched, the source MN transmits the relevant information of the RRC bearer at the source SN side to the target MN, so as to ensure that the SN air interface and the bearer information are unchanged after the MN is successfully switched, that is, the source SN and the target SN are the same SN. Specifically, the source MN may transmit the related information of the RRC bearer at the source SN side to the target MN through the X2 interface. Of course, the source MN can also pass the related information of the RRC bearer at the source SN side to the target MN before the MN handover is successful, especially in the case that it has been determined in advance that it is a handover with SN.
In the embodiment of the invention, the source SN always keeps RRC connection, and the source MN transmits the related information loaded by the RRC at the source SN side to the target MN, so that an SN air interface and the loaded information are unchanged after the MN is successfully switched. Compared with the scheme that the source SN disconnects the RRC (radio resource control) connection of the user plane after the MN is switched, and then the terminal initiates the RRC connection establishment process of the SN again, the method can further reduce the time delay of the user plane, namely reduce the time delay of the user plane from hundreds of milliseconds to tens of milliseconds, and improve the user experience.
Referring to fig. 7, fig. 7 is a flowchart illustrating a non-independent network switching method according to a fourth embodiment of the present invention, including the following steps:
step 701: the target main node receives related information of RRC load of a source auxiliary node side, which is sent by a source main node;
step 702: and the target main node determines the source auxiliary node as a target auxiliary node so as to maintain the RRC connection between the source auxiliary node and the terminal.
The order of steps 701 and 702 may be reversed.
It should be noted that the source primary node and the target primary node may be enbs, and the source secondary node may be a gNB or an en-gNB. Alternatively, the source primary node and the target primary node may be a gNB, and the source secondary node may be an eNB or an ng-eNB. Of course, this is only an example and is not a limitation to the embodiments of the present invention, and the source primary node and the target primary node may also be other evolved node bs, and the source secondary node may also be other evolved node bs.
According to the fourth embodiment, in the MN handover process, the source SN always maintains RRC connection, and the source MN transmits related information of RRC bearer at the source SN side to the target MN, so that an SN air interface and bearer information are unchanged after MN handover is successful. Compared with the scheme that the source SN disconnects the RRC connection of the user plane after the MN is switched, and then the terminal initiates the RRC connection establishment process of the SN again, the method can further reduce the time delay of the user plane. The embodiment of the invention is particularly suitable for the NSA networking non-shunting scene.
Optionally, the method further comprises at least one of the following steps:
the target main node acquires a control plane bearer (also called a signaling plane bearer) through an RRC reconfiguration message between the target main node and the terminal;
the target main node updates the secret key through RRC reconfiguration information between the target main node and the terminal;
and the target main node instructs the target auxiliary node to update the secret key through RRC reconfiguration information between the target auxiliary node and the terminal.
In the embodiment of the invention, after the MN is successfully switched, the terminal does not need to initiate an RRC reestablishment process to establish the RRC connection of the SN, but needs to obtain the signaling plane bearer and a new key through RRC reconfiguration. Specifically, after the target MN completes the handover, the target MN updates the key and notifies the target SN to update the key. The key updating employs an RRC reconfiguration procedure, and specifically, the target primary node may update the key through an RRC reconfiguration message with the terminal (e.g., steps 23 and 24 in fig. 4), or the target primary node notifies the target secondary node to update using the RRC reconfiguration procedure. That is, in the embodiment of the present invention, the key is updated through the RRC reconfiguration procedure, and is not updated through the RRC reestablishment procedure.
In the embodiment of the invention, the remaining user plane time delay is mainly due to the fact that the signaling plane carries updating and key updating.
The embodiments of the present invention provide technical solutions corresponding to the third embodiment and having the same inventive concept, and can achieve the same technical effects, and reference may be made to the third embodiment in detail, which is not described herein again.
Referring to fig. 8, fig. 8 is a schematic flowchart of a non-independent network switching method according to a fifth embodiment of the present invention, including the following steps:
step 801: in the handover process, the source secondary node serves as a target secondary node to maintain the RRC connection with the terminal.
It should be noted that, in the embodiment of the present invention, the target SN and the source SN are the same SN, that is, the handover process is a handover with an SN.
According to the fourth and fifth embodiments, in the MN handover process, the source SN always maintains RRC connection, and the source MN transmits related information of RRC bearer at the source SN side to the target MN, so that an SN air interface and bearer information are unchanged after MN handover is successful. Compared with the scheme that the source SN disconnects the RRC connection of the user plane after the MN is switched, and then the terminal initiates the RRC connection establishment process of the SN again, the method can further reduce the time delay of the user plane. The remaining user plane delay is mainly due to signaling plane bearer update and key update.
The embodiment of the invention is particularly suitable for the NSA networking non-shunting scene.
The embodiments of the present invention provide technical solutions corresponding to the third and fourth embodiments and having the same inventive concept, and can achieve the same technical effects, and reference may be made to the third and fourth embodiments in detail, which are not described herein again.
Referring to fig. 9, fig. 9 is a schematic structural diagram of a network-side device according to a sixth embodiment of the present invention, where the network-side device 900 serves as a source master node, and includes:
an indicating module 901, configured to indicate the source secondary node to disconnect the user plane data transmission and delete the RRC connection of the source secondary node after the target primary node is successfully switched.
In the embodiment of the invention, the source MN indicates the source SN to disconnect the user plane data transmission and delete the RRC connection of the SN under the source MN after the target MN is successfully switched, so that the user plane data can be transmitted before the MN is successfully switched. Compared with the mode of disconnecting the user plane data transmission when the MN is switched, the time delay of more than 100 milliseconds can be reduced, namely the user plane time delay (also called as pit dropping time delay) can be reduced from more than 500 milliseconds to more than 300 milliseconds, and the user experience is improved.
Optionally, the indicating module 901 is configured to, after the target master node is successfully switched and the target master node determines the target secondary node, instruct the source secondary node to disconnect the user plane data transmission and delete the RRC connection of the source secondary node.
The embodiment of the present invention is a product embodiment corresponding to the above method embodiment, and therefore, detailed description is omitted here, and please refer to the first embodiment in detail.
Referring to fig. 10, fig. 10 is a schematic structural diagram of a network-side device according to a seventh embodiment of the present invention, where the network-side device 1000 serves as a source-slave node, and includes:
a disconnecting and deleting module 1001, configured to disconnect user plane data transmission and delete the RRC connection according to an instruction of the source host node after the target host node is successfully switched.
In the embodiment of the invention, the source auxiliary node receives the indication that the source main node disconnects the user plane data transmission and deletes the RRC connection after the target main node is successfully switched, so that the user plane data can be transmitted before MN switching is successful. Compared with the mode of disconnecting the user plane data transmission when the MN is switched, the time delay of more than 100 milliseconds can be reduced, namely the user plane time delay (also called as pit dropping time delay) can be reduced from more than 500 milliseconds to more than 300 milliseconds, and the user experience is improved. The embodiment of the invention is particularly suitable for the NSA networking non-shunting scene.
Optionally, the disconnecting and deleting module 1001 is configured to disconnect the user plane data transmission and delete the RRC connection according to the instruction of the source master node after the target master node is successfully switched and the target master node determines the target secondary node.
Optionally, the source auxiliary node and the target auxiliary node are the same node.
The embodiment of the present invention is a product embodiment corresponding to the above method embodiment, and therefore, detailed description is omitted here, and please refer to the second embodiment.
Referring to fig. 11, fig. 11 is a schematic structural diagram of a network-side device according to an eighth embodiment of the present invention, where the network-side device 1100 serves as a source master node, and includes:
a sending module 1101, configured to send relevant information of an RRC bearer at the source secondary node side to the target primary node.
In the embodiment of the invention, the source SN always keeps RRC connection, and the source MN transmits the related information loaded by the RRC at the source SN side to the target MN, so that an SN air interface and the loaded information are unchanged after the MN is successfully switched. Compared with the scheme that the source SN disconnects the RRC (radio resource control) connection of the user plane after the MN is switched, and then the terminal initiates the RRC connection establishment process of the SN again, the method can further reduce the time delay of the user plane, namely reduce the time delay of the user plane from hundreds of milliseconds to tens of milliseconds, and improve the user experience.
The embodiment of the present invention is a product embodiment corresponding to the third embodiment of the method, and therefore, detailed description is omitted here, and please refer to the third embodiment.
Referring to fig. 12, fig. 12 is a schematic structural diagram of a network-side device according to a ninth embodiment of the present invention, where the network-side device serving as a target master node 1200 includes:
a receiving module 1201, configured to receive related information of an RRC bearer on a source secondary node side sent by a source master node;
a determining module 1202, configured to determine that the source secondary node is a target secondary node, so as to maintain an RRC connection between the source secondary node and a terminal.
In the embodiment of the invention, the source SN always keeps RRC connection in the MN switching process, and the source MN transmits the related information loaded by the RRC at the source SN side to the target MN, so that the SN air interface and the loading information are unchanged after the MN switching is successful. Compared with the scheme that the source SN disconnects the RRC connection of the user plane after the MN is switched, and then the terminal initiates the RRC connection establishment process of the SN again, the method can further reduce the time delay of the user plane. The embodiment of the invention is particularly suitable for the NSA networking non-shunting scene.
Optionally, the network side device further includes at least one of:
the control plane bearer updating module is used for acquiring a control plane bearer through an RRC reconfiguration message between the control plane bearer updating module and the terminal;
the first secret key updating module is used for updating the secret key through an RRC reconfiguration message between the first secret key updating module and the terminal;
and the second secret key updating module is used for indicating the target auxiliary node to update the secret key through the RRC reconfiguration message between the target auxiliary node and the terminal.
The embodiment of the present invention is a product embodiment corresponding to the fourth embodiment of the method, and therefore, details are not repeated here, and please refer to the fourth embodiment in detail.
Referring to fig. 13, fig. 13 is a schematic structural diagram of a network-side device according to a tenth embodiment of the present invention, where the network-side device 1300, as a source secondary node, includes:
a holding module 1301, configured to hold an RRC connection with the terminal during the handover procedure.
In the embodiment of the invention, the source SN always keeps RRC connection in the MN switching process, and the source MN transmits the related information loaded by the RRC at the source SN side to the target MN, so that the SN air interface and the loading information are unchanged after the MN switching is successful. Compared with the scheme that the source SN disconnects the RRC connection of the user plane after the MN is switched, and then the terminal initiates the RRC connection establishment process of the SN again, the method can further reduce the time delay of the user plane.
In the embodiment of the invention, the source auxiliary node and the target auxiliary node are the same node.
The embodiment of the present invention is a product embodiment corresponding to the fifth embodiment of the method, and therefore, details are not repeated here, and please refer to the fifth embodiment in detail.
Referring to fig. 14, fig. 14 is a schematic structural diagram of a network-side device according to an eleventh embodiment of the present invention, where the network-side device 1400, as a source master node, includes: a transceiver 1401 and a processor 1402;
the transceiver 1401 is configured to instruct the source secondary node to disconnect the user plane data transmission and delete the RRC connection of the source secondary node after the target primary node is successfully switched; alternatively, the first and second electrodes may be,
the transceiver 1401 is configured to send related information of the RRC bearer at the source secondary node side to the target primary node.
Optionally, the transceiver 1401 is configured to, after the target master node is successfully switched and the target master node determines the target secondary node, instruct the source secondary node to disconnect the user plane data transmission and delete the RRC connection of the source secondary node.
The embodiments of the present invention are product embodiments corresponding to the first and third embodiments of the method, and therefore, detailed descriptions thereof are omitted, and for specific technical solutions and technical effects thereof, please refer to the first and third embodiments.
Referring to fig. 15, fig. 15 is a schematic structural diagram of a network-side device according to a twelfth embodiment of the present invention, where the network-side device 1500 is used as a target master node, and includes: a transceiver 1501 and a processor 1502;
the transceiver 1501 is configured to receive related information of an RRC bearer on the source secondary node side sent by the source primary node;
the processor 1502 is configured to determine that the source secondary node is a target secondary node, so as to maintain an RRC connection between the source secondary node and a terminal.
Optionally, the transceiver 1501 is further configured to acquire a control plane bearer through an RRC reconfiguration message with the terminal; and/or the presence of a gas in the gas,
the transceiver 1501 is further configured to update a key through an RRC reconfiguration message with the terminal; and/or the presence of a gas in the gas,
the transceiver 1501 is further configured to instruct the target secondary node to update the key through an RRC reconfiguration message with the terminal.
The embodiment of the present invention is a product embodiment corresponding to the fourth embodiment of the method, and therefore details are not repeated herein, and please refer to the fourth embodiment for a specific technical scheme and a generated technical effect.
Referring to fig. 16, fig. 16 is a schematic structural diagram of a network-side device according to a thirteenth embodiment of the present invention, where the network-side device 1600 serves as a source secondary node, and includes: a transceiver 1601 and a processor 1602;
the processor 1602 is configured to, after the target master node is successfully switched, disconnect the user plane data transmission and delete the RRC connection according to the instruction of the source master node; alternatively, the first and second electrodes may be,
the processor 1602 is configured to maintain an RRC connection with a terminal during a handover procedure.
Optionally, the processor 1602 is configured to, after the target master node is successfully switched and the target master node determines the target secondary node, disconnect the user plane data transmission and delete the RRC connection according to the instruction of the source master node.
Optionally, the source auxiliary node and the target auxiliary node are the same node.
The embodiments of the present invention are product embodiments corresponding to the second and fifth embodiments of the method, and therefore, detailed descriptions thereof are omitted, and for specific technical solutions and technical effects thereof, refer to the second and fifth embodiments.
Referring to fig. 17, fig. 17 is a schematic structural diagram of a network-side device according to a fourteenth embodiment of the present invention, where the network-side device 1700 serves as a source master node, and includes a processor 1701, a memory 1702, and a computer program stored in the memory 1702 and capable of running on the processor 1701; the processor 1701, when executing the computer program, implements the steps of:
after the target main node is successfully switched, indicating the source auxiliary node to disconnect the user plane data transmission and deleting the RRC connection of the source auxiliary node; alternatively, the first and second electrodes may be,
and sending the related information of the RRC load of the source auxiliary node side to the target main node.
Optionally, the processor 1701 may further implement the following steps when executing the computer program:
the step of instructing the source secondary node to disconnect the user plane data transmission and delete the RRC connection of the source secondary node after the target primary node is successfully switched comprises the following steps:
and after the target main node is successfully switched and the target main node determines the target auxiliary node, indicating the source auxiliary node to disconnect the user plane data transmission and deleting the RRC connection of the source auxiliary node.
The specific working process of the embodiment of the present invention is the same as that of the first and third embodiments of the method, and therefore, detailed description thereof is omitted, and for specific technical solutions and technical effects, reference is made to the description of the method steps in the first and third embodiments.
Referring to fig. 18, fig. 18 is a schematic structural diagram of a network-side device according to a fifteenth embodiment of the present invention, where the network-side device 1800 serves as a target master node, and includes a processor 1801, a memory 1802, and a computer program stored in the memory 1802 and capable of running on the processor 1801; the processor 1801, when executing the computer program, implements the following steps:
receiving related information of RRC load bearing at a source auxiliary node side, which is sent by a source main node;
and determining the source auxiliary node as a target auxiliary node so as to maintain the RRC connection between the source auxiliary node and the terminal.
Optionally, when the processor 1801 executes the computer program, at least one of the following steps may also be implemented:
acquiring a control plane bearer through an RRC reconfiguration message with a terminal;
updating the key through an RRC reconfiguration message with the terminal;
and instructing the target auxiliary node to update the secret key through an RRC reconfiguration message with the terminal.
The specific working process of the embodiment of the present invention is the same as that of the fourth embodiment of the method, and therefore, details are not repeated herein, and for the specific technical scheme and the generated technical effects, reference is made to the description of the method steps in the fourth embodiment.
Referring to fig. 19, fig. 19 is a schematic structural diagram of a network-side device according to a sixteenth embodiment of the present invention, where the network-side device 1900 includes, as a source and a slave node, a processor 1901, a memory 1902, and a computer program stored in the memory 1902 and capable of running on the processor 1901; the processor 1901, when executing the computer program, performs the following steps:
after the target main node is successfully switched, disconnecting the user plane data transmission and deleting the RRC connection according to the indication of the source main node; alternatively, the first and second electrodes may be,
in the handover procedure, the RRC connection with the terminal is maintained.
Optionally, the processor 1901 may further implement the following steps when executing the computer program:
the step of disconnecting the user plane data transmission and deleting the RRC connection according to the indication of the source main node after the target main node is successfully switched comprises the following steps:
and after the target main node is successfully switched and the target main node determines the target auxiliary node, disconnecting the user plane data transmission and deleting the RRC connection according to the indication of the source main node.
Optionally, the source auxiliary node and the target auxiliary node are the same node.
The specific working process of the embodiment of the present invention is the same as that of the second and fifth embodiments of the method, and therefore, detailed descriptions thereof, specific technical schemes, and technical effects thereof are omitted herein, and please refer to the description of the method steps in the second and fifth embodiments.
Seventeenth embodiment of the present invention provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the method implements the steps in the non-independent network switching method in any one of the first to fifth embodiments. Please refer to the above description of the method steps in the corresponding embodiments.
The network side device in the embodiment of the present invention may be a Base Transceiver Station (BTS) in Global System for Mobile communication (GSM) or Code Division Multiple Access (CDMA), may also be a Base Station (NodeB, NB) in Wideband Code Division Multiple Access (WCDMA), may also be an evolved Node B (evolved Node B, eNB or eNodeB) in LTE, or a relay Station or Access point, or a Base Station in a future 5G network, and the like, which is not limited herein.
The computer-readable storage media described above, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (15)
1. A non-independent network switching method is characterized by comprising the following steps:
after the target main node is successfully switched, the source main node indicates the source auxiliary node to disconnect the user plane data transmission and deletes the RRC connection of the source auxiliary node; alternatively, the first and second electrodes may be,
and the source main node sends the related information of the RRC load of the source auxiliary node side to the target main node.
2. The method of claim 1, wherein the step of the source primary node instructing the source secondary node to disconnect the user plane data transmission and delete the RRC connection of the source secondary node after the target primary node is successfully handed over comprises:
and the source main node is successfully switched on the target main node, and the target main node determines the target auxiliary node, and then instructs the source auxiliary node to disconnect the user plane data transmission and delete the RRC connection of the source auxiliary node.
3. A non-independent network switching method is characterized by comprising the following steps:
the target main node receives related information of RRC load of a source auxiliary node side, which is sent by a source main node;
and the target main node determines the source auxiliary node as a target auxiliary node so as to maintain the RRC connection between the source auxiliary node and the terminal.
4. The method of claim 3, further comprising at least one of:
the target main node acquires a control plane bearer through an RRC reconfiguration message between the target main node and the terminal;
the target main node updates the secret key through RRC reconfiguration information between the target main node and the terminal;
and the target main node instructs the target auxiliary node to update the secret key through RRC reconfiguration information between the target auxiliary node and the terminal.
5. A non-independent network switching method is characterized by comprising the following steps:
after the target main node is successfully switched, the source auxiliary node disconnects the user plane data transmission and deletes the RRC connection according to the indication of the source main node; alternatively, the first and second electrodes may be,
in the handover process, the source secondary node serves as a target secondary node to maintain the RRC connection with the terminal.
6. The method of claim 5, wherein the step of the source secondary node disconnecting the user plane data transmission and deleting the RRC connection according to the indication of the source primary node after the target primary node is successfully switched comprises:
and the source auxiliary node is successfully switched on the target main node, and after the target main node determines the target auxiliary node, the user plane data transmission is disconnected and the RRC connection is deleted according to the indication of the source main node.
7. The method of claim 5, wherein the source secondary node and the target secondary node are the same node.
8. A network-side device, comprising:
the indication module is used for indicating the source auxiliary node to disconnect the user plane data transmission and delete the RRC connection of the source auxiliary node after the target main node is successfully switched; alternatively, the first and second electrodes may be,
and the sending module is used for sending the related information of the RRC load of the source auxiliary node side to the target main node.
9. A network-side device, comprising:
the receiving module is used for receiving related information of the RRC load of the source auxiliary node side, which is sent by the source main node;
a determining module, configured to determine that the source-secondary node is a target-secondary node, so as to maintain an RRC connection between the source-secondary node and a terminal.
10. A network-side device, comprising:
the disconnection and deletion module is used for disconnecting the user plane data transmission and deleting the RRC connection according to the indication of the source main node after the target main node is successfully switched; alternatively, the first and second electrodes may be,
and the maintaining module is used for maintaining the RRC connection with the terminal in the switching process.
11. A network-side device, comprising: a transceiver and a processor;
the transceiver is used for indicating the source auxiliary node to disconnect the user plane data transmission and deleting the RRC connection of the source auxiliary node after the target main node is successfully switched; alternatively, the first and second electrodes may be,
and the transceiver is used for sending the related information of the RRC load of the source auxiliary node side to the target main node.
12. A network-side device, comprising: a transceiver and a processor;
the transceiver is used for receiving related information of RRC load-bearing at the source auxiliary node side sent by the source main node;
the processor is configured to determine that the source secondary node is a target secondary node, so as to maintain RRC connection between the source secondary node and a terminal.
13. A network-side device, comprising: a transceiver and a processor;
the processor is used for disconnecting the user plane data transmission and deleting the RRC connection according to the indication of the source main node after the target main node is successfully switched; alternatively, the first and second electrodes may be,
the processor is configured to maintain an RRC connection with the terminal during the handover.
14. A network-side device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor; characterized in that the processor, when executing the computer program, implements the steps in the dependent network switching method according to any of claims 1 to 7.
15. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the non-standalone network handover method according to any of claims 1 to 7.
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Application publication date: 20210413 |