CN107040957A - A kind of switching method centered on user terminal - Google Patents
A kind of switching method centered on user terminal Download PDFInfo
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- CN107040957A CN107040957A CN201610078372.5A CN201610078372A CN107040957A CN 107040957 A CN107040957 A CN 107040957A CN 201610078372 A CN201610078372 A CN 201610078372A CN 107040957 A CN107040957 A CN 107040957A
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/34—Reselection control
- H04W36/36—Reselection control by user or terminal equipment
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/15—Setup of multiple wireless link connections
Abstract
This application provides a kind of switching method centered on user terminal.This method includes：When user terminal determine need to switch immediately, and target CCU for itself set up VCU when, then to service VCU send tunnel handover request, after tunnel building by service VCU come the handoff procedure of managing user terminal to target BS；When setting up tunnel, target CCU sets up the VCU of the user, when setting up completion and user has completed tunnel switching, then the VCU that target CCU is set up can be consigned to by the management control to user by servicing VCU.The seamless switching of customer-centric can be realized by the program.
Description
Technical field
The present invention relates to communication technical field, more particularly to a kind of switching side centered on user terminal
Method.
Background technology
The signal transmission of mobile communication is divided into chain of command and data surface, and chain of command is used for the access control of user
System, handover between cells, bearer connection management, RRM etc., data surface are used for user and effectively led to
The transmission of letter data.Current control plane is intended to centralized management, data surface and is intended to Distributed Multi association
Transmit.The reason for chain of command is intended to centralized management is that the expense of control signaling can be reduced, subtracted
Lack user's handover between cells, unified management Radio Resource preferably to provide the user channel resource on demand,
And preferably carry out interference control etc..Data surface be intended to Distributed Multi transmission be then can effectively profit
With the diversity and spatial multiplexing gain of multi-chain circuit transmission, improve message transmission rate and ensure communication quality.By
The Radio Access Network framework of this centralized management and control turns into a development trend of mobile communication naturally.
The Radio Access Network framework of so-called centralized management and control, i.e., multiple base stations are connected to a center control
Unit (Central Control Unit, CCU), unified resource pipe is carried out by the unit to connection base station
Manage, provide Access Control, base station to the data distribution core net etc. to base station range user.
Network function virtualization (NFV) technology is the development trend of mobile communication network device.In future
Heart control unit will be made up of the general hardware platform based on NFV technologies and virtualization control software.It is general
Hardware platform is mainly responsible for realizing the physical connection between centralized control unit and other equipment, virtualization control
The function that software processed is mainly responsible for general hardware platform is realized, and triggering centralized control unit is connected thereto
Other equipment between transmit specific data and signaling.
The equipment of one centralized control unit connection mainly includes access network side base station, other centers control list
Member, core-network side data gateway.Thus, the coverage of centralized control unit management and control is no longer simple
Directly there is the coverage sum of the base station of physical connection, but by being carried on general hardware platform
On virtualization control software determine, software under certain condition can by local centralized control unit with
The base station of other centralized control units connection is controlled, therefore, and centralized control unit management and control is covered
Lid scope is a virtual subdistrict determined by virtualization control actually.
In traditional access planar network architecture, when user terminal from a base station range is moved to another
, it is necessary to occur the switching of minizone during base station range.And this handover mechanism is no longer desirable for being based on
The new access network framework of virtual platform control.The user terminal switching problem of new access network framework,
It is not the switching in the meaning of conventional cell, but according to specific virtualization control function design, data and letter
Make between centralized control unit, between centralized control unit and base station, centralized control unit and core network
According to the change of the specific transmission path between gateway, and how to change what is carried depending on centralized control unit
Virtualize the specific works mechanism of control platform.
The content of the invention
In view of this, the application provide a kind of switching method centered on user terminal, can realize with
The seamless switching of user-center.
In order to solve the above technical problems, what the technical scheme of the application was realized in：
A kind of switching method centered on user terminal, this method includes：
When user terminal determines to be more than by the probability that service CCU is switched to target CCU according to measurement result
During first threshold, however, it is determined that target CCU does not set up destination virtual control unit for this user terminal
(Virtual Control Unit, VCU), then the user terminal by serving BS by measurement result, with
And tunnel handover request is transmitted to the service VCU of this user terminal；
Service VCU receives the measurement result, and during tunnel handover request, by measurement result and
Tunnel handover request recorded in the status information of the user terminal；And by servicing CCU and target CCU
Interface channel send the measurement result, tunnel handover request to target CCU, and be the user
The information that terminal is set up needed for VCU；
Target CCU is that the user is whole according to receiving as the information needed for the user terminal sets up VCU
Target VCU is set up at end, and the information needed for setting up service VCU to tunnel between target BS is passed through into clothes
Business CCU is sent to service VCU；
Information of the service VCU according to needed for the foundation service VCU to tunnel between target BS received is built
Vertical tunnel, and the data message and signalling of the user terminal are switched into target BS by serving BS；
If it is determined that being switched to target VCU manages the user terminal, then by the transfer management of user by servicing VCU
Target VCU is switched to, the data that user terminal is not transmitted on service VCU are sent to target
VCU, makes target VCU manage the user terminal；To core network data gateway transmitting path switching notice,
Make the gateway that the transmission path related to the user terminal is switched into target VCU by servicing VCU,
And set up data and signaling paths with target VCU.
As can be seen from the above technical solution, it is high in the application in the wireless access network based on virtual platform
Effect is set up dynamic user according to the mobility of user and connected using calculating, storage and the transfer resource of network
Administrative mechanism is connect, so as to realize the seamless switching centered on user terminal.
Brief description of the drawings
Fig. 1 is a kind of switching flow schematic diagram centered on user terminal of the embodiment of the present application；
Fig. 2 is the switching flow schematic diagram in the embodiment of the present application two centered on user terminal；
Fig. 3 is the switching flow schematic diagram in the embodiment of the present application three centered on user terminal；
Fig. 4 is the handling process schematic diagram in the embodiment of the present application four centered on user terminal；
Fig. 5 is the handling process schematic diagram in the embodiment of the present application five centered on user terminal.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with the accompanying drawings simultaneously
For embodiment, technical scheme is described in detail.
The application provides a kind of switching method centered on user terminal, in the wireless access based on virtual platform
In net, efficiently using calculating, storage and the transfer resource of network, set up dynamic according to the mobility of user
User's connection management mechanism, so as to realize the seamless switching centered on user terminal.
In the embodiment that the application is provided, when accessing user terminal to network, corresponding CCU can be the user
Terminal sets up a special VCU, for user terminal connection control management, and records the correlation of user terminal
Status information and data.
Base station, CCU and VCU in the embodiment of the present application can be deployed as same equipment, can also distinguish portion
Administration on different devices, can be deployed in an equipment, specific deployment way the application is implemented with two combinations
It is not limited in example.
VCU can be as the exclusive storage of a user terminal and control function, and function can be based on the virtual of CCU
Change control software to realize.
For VCU store function, then for recording the status information and data of user terminal, wherein, shape
State information includes user terminal basic configuration information, metrical information, connection and transmission state information etc., for example
Connection status, the resource allocation of user terminal association base station between user terminal ID, user terminal and base station
Channel measurement, user terminal transmission mode, user terminal switching between state, user terminal and base station
Request and response etc..
For VCU control function, then on the one hand according to user terminal state information, management, coordination are with using
The processes such as family terminal related transfer resource distribution, serving BS and transmission mode selection, and by correlated results
It is recorded in the status information of user terminal；On the other hand then manage and control associated transport passage in user
The interaction of the related data of terminal and signaling.
Specifically it may include：VCU reads the data and signaling related to user terminal for reaching CCU, and records
Into user terminal related status information；VCU is according to the transmission demand, status information and phase of user terminal
Close and transmit the data and signaling related to user terminal on signaling, triggering related channel program.
Various channel transfer resources can be carried out virtualization control by VCU, and each passage is specifically exported according to VCU
Instruction perform the transmission of related data and signaling.Related channel program may include passage between CCU and data gateway,
Passage, base station and the user between passage, CCU and user terminal association base station between CCU and other CCU
Terminal room is eated dishes without rice or wine.
Each passage is not the direct transmission channel between two equipment in traditional sense for VCU, but
The transmission path related to user terminal, may relate to the connection between multiple equipment, such as CCU and user
Passage between terminal association base station, it is a kind of be CCU and its there is passage between the base station of direct physical connection,
It is another can be CCU by the interface channel with other CCU, other CCU are connected in the way of tunnel
The base station of association.
User terminal sends signal in moving process, to peripheral base station and makees measurement of correlation, with according to measurement result
Judge itself whether need to switch over operation.
Metrical information may include that channel information, the user terminal between user terminal and peripheral base station move out base station and covered
Remaining time of lid scope etc..
Below in conjunction with the accompanying drawings, the switching realized in the embodiment of the present application centered on user terminal is described in detail
Journey.
Embodiment one
The embodiment is to determine to need to switch immediately in user terminal, and target CCU is not built for the user terminal
In the case of vertical target VCU, the handoff procedure centered on user terminal is realized.
Referring to Fig. 1, Fig. 1 is a kind of switching flow schematic diagram centered on user terminal of the embodiment of the present application.
Concretely comprise the following steps:
Step 101, when user terminal determines to be switched to the general of target CCU by servicing CCU according to measurement result
When rate is more than first threshold, however, it is determined that target CCU does not set up target VCU for this user terminal, then the user
Measurement result, and tunnel handover request are transmitted to the service of this user terminal by terminal by serving BS
VCU。
When user terminal according to measurement result determines that the probability that target CCU is switched to by servicing CCU is more than the
During one threshold value, determine that the user terminal needs to switch immediately, that is, switch more urgent.
First threshold is configured according to practical application.
It can store which CCU establishes VCU for which user terminal on base station, therefore, user terminal passes through
Current serving BS determines whether target CCU is that this user terminal sets up VCU.
The tunnel handover request that user terminal is sent, for asking service VCU to be set up by target CCU
Communication tunnel between target BS, service VCU can be obtained from target CCU needed for the switching of completion tunnel
Information.
When implementing, measurement result, and tunnel handover request are first sent to serving BS by user terminal,
Measurement result, and tunnel handover request are sent to service CCU by serving BS, and service CCU again will measurement
As a result, and tunnel handover request be transmitted to service VCU.
Step 102, service VCU receives the measurement result, and during tunnel handover request, will measure
As a result in the status information that the user terminal is recorded with tunnel handover request；And by servicing CCU and target
CCU interface channel sends the measurement result, tunnel handover request to target CCU, and is the user
The information that terminal is set up needed for VCU.
Step 103, target CCU is this according to receiving as the information needed for the user terminal sets up VCU
User terminal sets up target VCU, and the information needed for setting up service VCU to tunnel between target BS is led to
The service CCU of mistake is sent to service VCU.
Target CCU sets up target VCU, and will set up needed for service VCU to tunnel between target BS
Information by service CCU be sent to service VCU operation in no particular order order, can carry out simultaneously.
Step 104, service VCU is according to needed for the foundation service VCU to tunnel between target BS received
Information set up tunnel, and the data message and signalling of the user terminal are switched into mesh by serving BS
Mark base station.
In step 103, target CCU, which is set up, to be completed after target VCU, can send target to service VCU
CCU sets up the confirmation message for completing target VCU.
Perform after step 104, service VCU is receiving target CCU foundation completion targets VCU really
When recognizing message, step 105 is performed.
Step 105, service VCU manages the user terminal if it is determined that being switched to target VCU, then will use
The transfer management at family switches to target VCU by servicing VCU, and user terminal is not transmitted on service VCU
The data of completion are sent to target VCU, target VCU is managed the user terminal；To core network data net
Transmitting path switching notice is closed, makes the gateway by the transmission path related to the user terminal by servicing VCU
Target VCU is switched to, and data and signaling paths are set up with target VCU.
Service VCU manages the user terminal if it is determined that not switching to target VCU, then using the tunnel set up
Road is connected to the transmission management and control of target BS and implementation to user terminal.
Embodiment two
The embodiment is to determine to need to switch immediately in user terminal, and target CCU sets up for the user terminal
In the case of target VCU, the handoff procedure centered on user terminal is realized.
Referring to Fig. 2, Fig. 2 is the switching flow schematic diagram in the embodiment of the present application two centered on user terminal.
Concretely comprise the following steps：
Step 201, when user terminal determines to be switched to the general of target CCU by servicing CCU according to measurement result
Rate be more than first threshold when, however, it is determined that target CCU be this terminal set up target VCU, then the user terminal with
Target BS sets up interface channel.
When user terminal sets up interface channel with target BS, user terminal is initiated connection to target BS and set up
Process, interface channel is set up with target BS.Target BS, can be to target after the completion of interface channel foundation
VCU sends connection and sets up confirmation message.
Step 202, when target VCU receives the interface channel foundation completion confirmation message of target BS transmission,
In the status information that the connection status of user terminal and target BS recorded to the user；By the user terminal
Data message and signalling target BS is switched to by serving BS.
Step 203, target VCU sends the data that user terminal is not transmitted on service VCU
Target VCU is given, target VCU is managed the user terminal；And cut to core network data gateway transmitting path
Notice is changed, makes the gateway that the transmission path related to the user terminal is switched into target by servicing VCU
VCU, and set up data and signaling paths with target VCU.
Embodiment three
The embodiment is to determine to need to switch immediately in user terminal, and target CCU sets up for the user terminal
In the case of target VCU, the handoff procedure centered on user terminal is realized.
Referring to Fig. 3, Fig. 3 is the switching flow schematic diagram in the embodiment of the present application three centered on user terminal.
Concretely comprise the following steps：
Step 301, when user terminal determines to be switched to the general of target CCU by servicing CCU according to measurement result
When rate is more than first threshold, however, it is determined that target CCU is that this terminal sets up target VCU, then passes through serving BS
Measurement result, and tunnel handover request are transmitted to the service VCU of this user terminal.
Step 302, service VCU receives the measurement result, and during tunnel handover request, will measure
As a result in the status information that the user terminal is recorded with tunnel handover request；And by servicing CCU and target
CCU interface channel sends the measurement result, and tunnel handover request to target CCU.
Step 303, target CCU is receiving the measurement result, and during tunnel handover request, will build
Information needed for vertical service VCU to tunnel between target BS is sent to service VCU by servicing CCU.
Step 304, service VCU is according to needed for the foundation service VCU to tunnel between target BS received
Information set up tunnel, and the data message and signalling of the user terminal are switched into mesh by serving BS
Mark base station.
Step 305, service VCU manages the user terminal if it is determined that being switched to target VCU, then will use
The transfer management at family switches to target VCU by servicing VCU, and user terminal is not transmitted on service VCU
The data of completion are sent to target VCU, target VCU is managed the user terminal；To core network data net
Transmitting path switching notice is closed, makes the gateway by the transmission path related to the user terminal by servicing VCU
Target VCU is switched to, and data and signaling paths are set up with target VCU.
Service VCU manages the user terminal if it is determined that not switching to target VCU, then using the tunnel set up
Road is connected to the transmission management and control of target BS and implementation to user terminal.
Example IV
The embodiment is to determine to switch in user terminal, and target CCU is not built for the user terminal
In the case of vertical target VCU, the processing procedure centered on user terminal is realized；When it is determined that may cut
Change, and target CCU for the user terminal set up target VCU when, it is without any processing.
Referring to Fig. 4, Fig. 4 is the handling process schematic diagram in the embodiment of the present application four centered on user terminal.
Concretely comprise the following steps：
Step 401, when user terminal determines to be switched to the general of target CCU by servicing CCU according to measurement result
When rate is more than Second Threshold and is not less than first threshold, however, it is determined that target CCU does not set up target for this terminal
VCU, then the user terminal target VCU is set up by measurement result, and in target CCU by serving BS
Request be transmitted to the corresponding service VCU of service CCU.
When user terminal according to measurement result determines that the probability that target CCU is switched to by servicing CCU is more than the
Two threshold values and not less than first threshold when, user terminal determines itself to switch, it is necessary to target CCU
Target VCU is established for user terminal.
Second Threshold is configured according to practical application, and Second Threshold is less than first threshold.
Step 402, service VCU receives the measurement result, and sets up target VCU in target CCU
Request when, measurement result and request recorded in the status information of user；And by servicing CCU and mesh
The interface channel for marking CCU sends the measurement result to target CCU, sets up target VCU in target CCU
Request, and for the information needed for the user terminal sets up VCU.
Step 403, if target CCU is defined as according to the measurement result and own resource state that receive
The user terminal sets up target VCU, then sets up target VCU for the user terminal, by target CCU to
Service VCU, which is sent, sets up target VCU responses, and notifies target BS to be initiated and target in the user terminal
Selection accesses the user terminal when connection between base station is set up.
If target CCU determines whole not for the user according to the measurement result and own resource state received
Target VCU is set up at end, then the response for not setting up target VCU is directly sent to service VCU, and by servicing
VCU notifies user terminal by serving BS.
Step 404, target VCU is set up response and is sent to user terminal by serving BS by service VCU.
Embodiment five
The embodiment is to determine temporarily switch in user terminal, and target CCU is that the user terminal is built
In the case of vertical target VCU, the processing procedure centered on user terminal is realized.
Referring to Fig. 5, Fig. 5 is the handling process schematic diagram in the embodiment of the present application five centered on user terminal.
Concretely comprise the following steps：
Step 501, when user terminal determines to be switched to the general of target CCU by servicing CCU according to measurement result
When rate is not more than Second Threshold, however, it is determined that target CCU is that this terminal sets up target VCU, then the user terminal
The request that delete target VCU is set up is sent to the corresponding service VCU of service CCU by serving BS.
When user terminal determines to be not more than by the probability that service CCU is switched to target CCU according to measurement result
During Second Threshold, that is, determine that user terminal need not temporarily be switched over, if target CCU is whole for the user
Target VCU is set up at end, then sends removal request, set up with being released to the user terminal shared by VCU
Resource.
Step 502, service VCU believes the state that the delete target VCU requests set up record the user terminal
In breath, and the request that delete target VCU is set up is sent to target CCU.
Step 503, when target VCU receives the request that the delete target VCU is set up, it is according to determination
Resource shared by no release target VCU carries out respective handling, and sends carrying result to service VCU
Response.
When it is determined that discharging resource shared by target VCU, the target VCU is deleted, and send out to service VCU
When sending response, carry delete target VCU and identify；When it is determined that not discharging resource shared by target VCU,
When sending response to service VCU, carry not delete target VCU and identify.
Step 504, service VCU is sent when receiving the response for carrying result by serving BS
The user terminal is given, makes user terminal be known whether to have deleted the target VCU's according to the result
Set up.
Serving BS and target BS in the embodiment of the present application are not limited to single base station.Service CCU and
Target CCU is not limited to single CCU.
In above-mentioned processing procedure, in fact it could happen that user terminal is all set up at service CCU and target CCU
There are the VCU situations that oneself is exclusive, now need to keep the user between service VCU and target VCU
Terminal related information is synchronous.Work as user terminal simultaneously to complete to be switched from current service VCU to target VCU,
When not discharging current service VCU, original service VCU turns into new target VCU, former target VCU
As new service VCU, now user can be initiated to discharging target using step 501 to step 504
VCU implementation process, can also take money by the automatic former service VCU of release after the completion of VCU switchings
Source.I.e. when user terminal is switched to target VCU by servicing VCU, the service VCU set up is deleted.
In summary, the application is by the wireless access network based on virtual platform, efficiently utilizing network
Calculating, storage and transfer resource, dynamic user's connection management mechanism is set up according to the mobility of user,
So as to realize the seamless switching centered on user terminal.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all at this
Within the spirit and principle of invention, any modification, equivalent substitution and improvements done etc. should be included in
Within the scope of protection of the invention.
Claims (8)
1. a kind of switching method centered on user terminal, it is characterised in that this method includes：
When user terminal determines to be switched to target CCU by service center controls unit CCU according to measurement result
Probability when being more than first threshold, however, it is determined that target CCU does not set up the special control of destination virtual for this user terminal
Unit VCU processed, then the user terminal is by serving BS by measurement result, and tunnel handover request is forwarded
Service VCU to this user terminal；
Service VCU receives the measurement result, and during tunnel handover request, by measurement result and tunnel
Handover request recorded in the status information of the user terminal；And by servicing CCU and target CCU company
Connect road and send the measurement result, tunnel handover request to target CCU, and set up for the user terminal
Information needed for VCU；
Target CCU is the user terminal according to receiving as the information needed for the user terminal sets up VCU
Target VCU is set up, and by the information needed for foundation service VCU to tunnel between target BS by servicing CCU
It is sent to service VCU；
Information of the service VCU according to needed for the foundation service VCU to tunnel between target BS received is set up
Tunnel, and the data message and signalling of the user terminal are switched into target BS by serving BS；If
It is determined that being switched to target VCU manages the user terminal, then by the transfer management of user by servicing VCU switchings
To target VCU, the data that user terminal is not transmitted on service VCU are sent to target VCU,
Target VCU is set to manage the user terminal；To core network data gateway transmitting path switching notice, make the net
Close the transmission path related to the user terminal and target VCU switched to by service VCU, and with target VCU
Set up data and signaling paths.
2. according to the method described in claim 1, it is characterised in that methods described further comprises：
When user terminal according to measurement result determines that the probability that target CCU is switched to by servicing CCU is more than the
During one threshold value, however, it is determined that target CCU is that this terminal sets up target VCU, then the user terminal and target BS
Set up interface channel；
It is when the interface channel that target VCU receives target BS transmission sets up completion confirmation message, user is whole
End and the connection status of target BS recorded in the status information of the user；The data of the user terminal are believed
Breath and signalling switch to target BS by serving BS；User terminal is not transferred on service VCU
Into data be sent to target VCU, target VCU is managed the user terminal；And to core network data net
Transmitting path switching notice is closed, makes the gateway by the transmission path related to the user terminal by servicing VCU
Target VCU is switched to, and data and signaling paths are set up with target VCU.
3. according to the method described in claim 1, it is characterised in that methods described further comprises：
When user terminal according to measurement result determines that the probability that target CCU is switched to by servicing CCU is more than the
During one threshold value, however, it is determined that target CCU is that this terminal sets up target VCU, then it will be measured and tied by serving BS
Really, and tunnel handover request is transmitted to the service VCU of this user terminal；
Service VCU receives the measurement result, and during tunnel handover request, by measurement result and tunnel
Handover request recorded in the status information of the user terminal；And by servicing CCU and target CCU company
Connect road and send the measurement result, and tunnel handover request to target CCU；
Target CCU is receiving the measurement result, and during tunnel handover request, VCU is serviced by setting up
To the information needed for tunnel between target BS service VCU is sent to by servicing CCU；
Information of the service VCU according to needed for the foundation service VCU to tunnel between target BS received is set up
Tunnel, and the data message and signalling of the user terminal are switched into target BS by serving BS；If
It is determined that being switched to target VCU manages the user terminal, then by the transfer management of user by servicing VCU switchings
To target VCU, the data that user terminal is not transmitted on service VCU are sent to target VCU,
Target VCU is set to manage the user terminal；To core network data gateway transmitting path switching notice, make the net
Close the transmission path related to the user terminal and target VCU switched to by service VCU, and with target VCU
Set up data and signaling paths.
4. according to the method described in claim 1, it is characterised in that methods described further comprises：
When user terminal according to measurement result determines that the probability that target CCU is switched to by servicing CCU is more than the
Two threshold values and during not less than first threshold, however, it is determined that target CCU does not set up target VCU for this terminal, then should
User terminal is turned by serving BS by measurement result, and in the target CCU requests for setting up target VCU
Issue the corresponding service VCU of service CCU；
Service VCU receives the measurement result, and when target CCU sets up target VCU request,
Measurement result and request recorded in the status information of user；And by servicing CCU and target CCU's
Interface channel sends the measurement result to target CCU, target VCU request is set up in target CCU,
And for the information needed for the user terminal sets up VCU；
If target CCU is defined as the user terminal according to the measurement result and own resource state that receive
Target VCU is set up, then sets up target VCU for the user terminal, is sent out by target CCU to service VCU
Send and set up target VCU responses, and notify target BS to initiate the connection between target BS in the user terminal
Selection accesses the user terminal when setting up；
Target VCU is set up response and is sent to user terminal by serving BS by service VCU.
5. according to the method described in claim 1, it is characterised in that methods described further comprises：
When user terminal determines to be not more than by the probability that service CCU is switched to target CCU according to measurement result
During Second Threshold, however, it is determined that target CCU is that this terminal sets up target VCU, then the user terminal passes through service
Base station sends the request that delete target VCU is set up to the corresponding service VCU of service CCU；
Service VCU records the delete target VCU requests set up in the status information of the user terminal, and
The request of delete target VCU foundation is sent to target CCU；
When target VCU receives the request that the delete target VCU is set up, according to determining whether to discharge mesh
Mark resource shared by VCU and carry out respective handling, and the response for carrying result is sent to service VCU；
It is whole that service VCU is sent to the user when receiving the response for carrying result, by serving BS
End, makes user terminal be known whether to have deleted the foundation of the target VCU according to the result.
When user has found temporarily switch, and it has been oneself foundation that user, which has found target CCU place,
During VCU, VCU can be sent to service VCU and sets up cancellation request, release has may be selected in target CCU
Resource is taken for the VCU that user sets up.
6. according to the method described in claim 1, it is characterised in that methods described further comprises：
When user terminal is completed from service VCU to target VCU switching, the service set up is deleted
VCU。
7. the method according to claim 1-6 any one, it is characterised in that
The CCU user sets up and deleted VCU.
8. the method according to claim 1-6 any one, it is characterised in that
The VCU is used to be corresponding user terminal storage state information and data；According to user state information,
Management, coordination transfer resource distribution, serving BS and the transmission mode selection related to user terminal；And manage
The interaction of the data and signaling related to user in reason and control associated transport passage.
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