CN107371198A - The method and system of cell switching - Google Patents
The method and system of cell switching Download PDFInfo
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- CN107371198A CN107371198A CN201610316523.6A CN201610316523A CN107371198A CN 107371198 A CN107371198 A CN 107371198A CN 201610316523 A CN201610316523 A CN 201610316523A CN 107371198 A CN107371198 A CN 107371198A
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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
- H04W36/0055—Transmission or use of information for re-establishing the radio link
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/19—Connection re-establishment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/20—Manipulation of established connections
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/20—Manipulation of established connections
- H04W76/27—Transitions between radio resource control [RRC] states
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Abstract
The present invention relates to a kind of method and system of cell switching, including：First object base station sends switching information record message to switching record node, so that switching records nodes records handover information first, first object base station is the target BS that source base station determines according to the target physical cell ID of reported by user equipment UE, and target physical cell ID is the Physical Cell Identifier of the cell for the second target BS that UE is determined；If UE accesses to the failure of the second target BS, the second target BS inquires about to obtain handover-target base station first；First object base station coordinates with the second target BS carries out secondary switching preparation, and first object base station is sent to source base station switches completion notice first；Second target BS sends RRC connection re-establishments to UE and reconfigured, and configures RRC using the second switchable resource so that UE is successfully accessed in the second target BS；Second target BS transmitting path handover request, so that Deta bearer passage switches to the second target BS, improves cell handover success rate.
Description
Technical field
The present invention relates to field of mobile communication, more particularly to a kind of method and system of cell switching.
Background technology
In Long Term Evolution (Long Term Evolution, LTE) system, user equipment (User Equipment, UE)
After initiating data service calls, in different macro base stations (evolved Node B, eNB) or family macro base station (Home
ENodeB, HeNB) minizone movement when, it is necessary to switch over, ensure data service continuity.
During actual deployment, Physical Cell Identifier (the Physical Cell of source base station peripheral adjacent base station cell be present
Identifier, PCI) identical situation, eNB can not accurately identify the desired target BS of UE in switch decision, may cut
False target base station is changed to, causes handoff failure.
The content of the invention
Based on this, it is necessary to for above-mentioned technical problem, there is provided a kind of method and system of cell switching, improve cell and cut
Change power into.
A kind of method of cell switching, methods described include：
First object base station sends switching information record message to switching record node, so that the switching record node note
Handover information, the first object base station are that source base station is true according to the target physical cell ID of reported by user equipment UE first for record
Fixed target BS, the Physical Cell Identifier are the physics of the cell for the second target BS for meeting handoff threshold that UE is determined
Cell ID；
If the first switchable resource that UE is distributed using first object base station accesses to the failure of the second target BS, described the
It is the first object base station that the two target BS inquiry switching record node, which obtains handover-target base station first,；
The first object base station coordinates with second target BS carries out secondary switching preparation, the second target base
Stand and distribute the second switchable resource；
The first object base station is sent to the source base station switches completion notice first；
Second target BS is connected with RRC to UE transmission radio resource control RRC connection re-establishments and reconfigured, and is used
Second switchable resource configures RRC so that UE accesses to the success of the second target BS according to second switchable resource, to institute
State the second target BS send configuration success response；
The second target BS transmitting path handover request, so that Deta bearer passage switches to the second target BS.
A kind of system of cell switching, the system include：
Secondary handover source base station processing module, for making first object base station send handover information note to switching record node
Message is recorded, so that handover information, the first object base station are source base station according to user to the switching record nodes records first
The target BS that the target physical cell ID that equipment UE reports determines, the target physical cell ID are the satisfaction that UE is determined
The Physical Cell Identifier of the cell of second target BS of handoff threshold；
Secondary handover-target base station processing module, if the first switchable resource distributed for UE using first object base station
The failure of the second target BS is accessed to, the second target BS inquiry switching record node is switched target first
Base station is the first object base station；
The secondary handover source base station processing module is additionally operable to coordinate with secondary handover-target base station processing module, makes described
First object base station coordinates with second target BS carries out secondary switching preparation, and the second target BS distribution second is cut
Change resource；
The secondary handover source base station processing module is additionally operable to make the first object base station send head to the source base station
Secondary switching completion notice；
The secondary handover-target base station processing module is additionally operable to make second target BS send Radio Resource to UE
Control RRC connection re-establishments connects with RRC and reconfigured, and use second switchable resource configuration RRC so that UE is according to described the
Two switchable resources access to the success of the second target BS, to the second target BS send configuration success response；
The secondary handover-target base station processing module is additionally operable to make the second target BS transmitting path handover request,
So that Deta bearer passage switches to the second target BS.
The method and system of above-mentioned cell switching, handover information is sent to switching record node by first object base station and remembered
Message is recorded, so that handover information, first object base station are source base station according on user equipment (UE) to switching record nodes records first
The target BS that the target physical cell ID of report determines, target physical cell ID are meet handoff threshold that UE is determined
The Physical Cell Identifier of the cell of two target BS, if the first switchable resource that UE is distributed using first object base station accesses to
Second target BS fails, and it is first object base that the second target BS inquiry switching record node, which obtains handover-target base station first,
Stand, first object base station coordinates with the second target BS carries out secondary switching preparation, the second target BS distribution the second switching money
Source, first object base station is sent to source base station switches completion notice first, and the second target BS sends RRC connection re-establishments to UE
Connect and reconfigure with RRC, configure RRC using the second switchable resource so that UE accesses to the second target according to the second switchable resource
Base station success, to the second target BS send configuration success response, the second target BS transmitting path handover request, so that
Deta bearer passage switches to the second target BS, even if the Physical Cell Identifier of neighbor cell is identical, causes to switch mistake first
Lose, also handoff error target BS first can be obtained by handover information first, so as to carry out false target base station and correct mesh
Mark the resource reconfiguration between base station so that switch successfully again, improve the success rate of cell switching.
A kind of system of cell switching, the system include：First object base station, the second target BS, switching record section
Point；
The first object base station, for sending switching information record message to switching record node, so that the switching
Handover information, the first object base station are target of the source base station according to reported by user equipment UE first described in record nodes records
The target BS that Physical Cell Identifier determines, the target physical cell ID are the second mesh for meeting handoff threshold that UE is determined
Mark the Physical Cell Identifier of the cell of base station；
Second target BS, if accessing to for UE the first switchable resources distributed using first object base station
Two target BS fail, and it is the first object base station to inquire about the switching record node and obtain handover-target base station first；
The first object base station, which is additionally operable to coordinate with the second target BS, carries out secondary switching preparation；
Second target BS is additionally operable to distribute the second switchable resource；
The first object base station is additionally operable to send to the source base station switches completion notice first；
Second target BS is additionally operable to send radio resource control RRC connection re-establishment to UE and connect with RRC to match somebody with somebody again
Put, use second switchable resource configuration RRC so that UE according to second switchable resource access to the second target BS into
Work(, to the second target BS send configuration success response；
Second target BS is additionally operable to transmitting path handover request, so that Deta bearer passage switches to the second target
Base station.
The system of above-mentioned cell switching, the cooperation of node is recorded by first object base station, the second target BS, switching,
Switching information record message is sent from first object base station to switching record node, so that switching record nodes records switch first
Information, first object base station are the target BS that source base station determines according to the target physical cell ID of reported by user equipment UE,
Target physical cell ID is the Physical Cell Identifier of the cell for the second target BS for meeting handoff threshold that UE is determined, if
The first switchable resource that UE is distributed using first object base station accesses to the failure of the second target BS, and the inquiry of the second target BS is cut
It is first object base station to change record node and obtain handover-target base station first, first object base station and the second target BS coordinate into
The secondary switching of row prepares, and the second target BS distributes the second switchable resource, and first object base station is sent to source base station to be switched first
Completion notice, the second target BS send radio resource control RRC connection re-establishment to UE and connect and reconfigure with RRC, use the
Two switchable resources configure RRC so that UE accesses to the success of the second target BS according to the second switchable resource, to the second target BS
Send configuration success response, the second target BS transmitting path handover request, so that Deta bearer passage switches to the second target
Base station, even if the Physical Cell Identifier of neighbor cell is identical, cause handoff failure first, can also be obtained by handover information first
Handoff error target BS first, so as to carry out the resource reconfiguration between false target base station and correct target BS so that again
Secondary handover success, improve the success rate of cell switching.
Brief description of the drawings
Fig. 1 is the applied environment figure of the method that cell switches in one embodiment；
Fig. 2 is the flow chart of the method that cell switches in one embodiment；
Fig. 3 is the timing diagram that eNB carries out S1 switchings to eNB in one embodiment；
Fig. 4 is the timing diagram that eNB carries out X2 switchings to eNB in one embodiment；
Fig. 5 is the timing diagram that eNB carries out S1 switchings to HeNB in one embodiment；
Fig. 6 is the timing diagram that eNB carries out X2 switchings to HeNB when there is X2 GW in one embodiment；
Fig. 7 is the timing diagram that eNB carries out X2 switchings to HeNB when without X2 GW in one embodiment；
Fig. 8 is the structured flowchart of the system that cell switches in one embodiment；
Fig. 9 is the structured flowchart of the system of another cell switching in one embodiment.
Embodiment
Fig. 1 is the applied environment figure for the method operation that cell switches in one embodiment, as shown in figure 1, the application environment
It is real including macro base station eNB, family macro base station HeNB, family macro base station gateway HeNB GW, X2 gateway X2 GW roads, mobile management
Body MME and gateway S-GW, wherein eNB, HeNB are the network equipments for providing the user wireless access, and MME and S-GW belong to
The node of core net.ENB individually establishes S1 with MME and is connected, and X2 connections can be established between eNB and periphery eNB.HeNB need by
S1 is established with MME to be connected, X2 connections can be directly established between HeNB after HeNB GW progress S1 convergences, between HeNB and eNB,
X2 connections can be directly established, X2 GW routing forwardings can also be passed through.Source base station can divide to the handoff scenario of target BS
Switch for S1 switching of the X2 switchings, eNB of S1 switchings of the eNB to eNB, eNB to eNB to HeNB, eNB to HeNB X2.
As shown in Fig. 2 in one embodiment, there is provided a kind of method of cell switching, applied to above-mentioned application environment,
Comprise the following steps：
Step S610, first object base station sends switching information record message to switching record node, so that switching records
Handover information, first object base station are target physical cell ID of the source base station according to reported by user equipment UE to nodes records first
The target BS of determination, target physical cell ID are the thing of the cell for the second target BS for meeting handoff threshold that UE is determined
Manage cell ID.
Specifically, the method that UE determines to meet the second target BS eNB2 of handoff threshold cell can customize, such as source
Base station eNB issues configuration message to UE, carries measurement strategies, and UE is met according to measurement strategies to the measurement of periphery related cell
The cell of second target BS of handoff threshold, or UE meet the second target BS of handoff threshold according to historical information determination
Cell etc..The Physical Cell Identifier for obtaining the cell of the second target BS obtains target physical cell ID.UE reports to source eNB
Target physical cell ID, report the mode of target physical cell ID not limit, target physical cell ID can such as be carried
In measurement report.Source eNB searches the neighboring BS information safeguarded by target physical cell ID, confirms handover-target base station for the
One target BS eNB1.Because neighbor cell has identical PCI, cause to search neighboring BS information by target physical cell ID
The target BS of determination is not eNB2, but the target BS of mistake is eNB1.In one embodiment, source eNB is according to autonomous
Decision-making determines a target BS, and the target BS determined is eNB1, and the second target BS eNB2 just determined with UE is not
Together, may also occur switching in this case unsuccessful.Source eNB initiates switching flow to eNB1, according to the class of target BS
The difference of type and switching type, switching flow is also different, and switching type includes but is not limited to S1 switchings, X2 switchings, and wherein X2 is cut
Change and be divided into the X2 switchings for there are X2 GW, the X2 switchings without X2 GW, eNB1 type includes but is not limited to macro base station, the grand base of family
Stand.After initiating switching flow, eNB1 can be that UE distributes the first switchable resource, and source eNB issues RRC connections configuration message to UE, by
In UE determine meet handoff threshold be eNB2 cell, UE according to RRC connections configure message use first object base station divide
The first switchable resource matched somebody with somebody switches to the second target BS.Because resource and target BS mismatch, switch unsuccessful, UE first
The second target BS can not be accessed.
First object base station sends switching information record message to switching record node, and transmission time point can adjust as needed
Whole, the back that the second target BS of access is such as attempted in UE is sent, it is ensured that can be immediately from switching record section after handoff failure
Point inquires about handover information first.Switching record node is the equipment for storing switching information record, receives switching information record
After message, obtain handover information first and recorded.Different set can be corresponded to according to the type and switching type of target BS
It is standby, switching record node can be one or more, necessary to can be switching flow in node one of them or be and switching stream
Cheng Wuguan other independent equipment.Handover information includes source base station mark, the mark that user distributes in source base station, target BS
Information, the forms and sending method of information such as mark do not limit.Handover information records the storage form of node not in switching first
Limit, such as carry out being converted to the form for being easy to search and stored.
Step S620, if the first switchable resource that UE is distributed using first object base station accesses to the mistake of the second target BS
Lose, it is first object base station that the second target BS inquiry switching record node, which obtains handover-target base station first,.
Specifically, UE after handoff failure, sends to eNB2 and re-establishes request message, carrying cause value is handoff failure,
ENB2 initiates to inquire about the process of handover-target base station first to switching record node, such as sends source base station mark to switching record node
Know, user in the mark that source base station distributes is first object base station so as to inquire about to obtain handover-target base station first, also can be to cutting
The key word of the inquiry that record node is sent after conversion is changed to be inquired about.
Step S630, first object base station coordinates with the second target BS carries out secondary switching preparation, the second target BS
Distribute the second switchable resource.
Specifically, secondary switching preparation needs to prepare switchable resource, secondary handover request message is sent to eNB2 by eNB1,
ENB2 responds secondary handover request ack message after distributing the second switchable resource.
Step S640, first object base station is sent to source base station switches completion notice first.
Specifically, according to switching type and the difference of target BS type, it can directly send to source base station and switch first
The release of UE context resources is carried out into notice, can also be switched first by other nodes, such as MME, HeNBGW, X2 GW transfer
Completion notice.The resource and other relevant informations that user distributes on base station are UE context resources.And according to switching type and
The difference of target BS type, the time point for sending switching completion notice first can be different, such as can be in secondary switching completion notice
The step of after carry out UE context resources release.
In one embodiment, when switching to X2 to switch, step S140 please in the switching of the second target BS transmitting path
Ask, so as to be performed after the step of Deta bearer passage switches to the second target BS.
Specifically, after Deta bearer passage switches to the second target BS, the second target basis can be to first object base station
Secondary switching is notified to complete, first object base station sends UE context resource releasing requests to source base station, can also pass through other sections
Point, such as HeNB GW, X2 GW transfer UE context resource releasing requests, carry out the release of resource.It is logical that completion will then be switched first
Know and merge with the secondary release for switching resource corresponding to completion notice, reduce unnecessary data interaction flow, improve effect
Rate.
Step S650, the second target BS sends radio resource control RRC connection re-establishment and connected with RRC to UE matches somebody with somebody again
Put, use the second switchable resource configuration RRC so that UE accesses to the success of the second target BS according to the second switchable resource, to the
Two target BS send configuration success responses.
Specifically, RRC connection re-establishment message, it is the second switchable resource to carry new distribution resource, it is desirable to which UE is according to new money
Source rebuilds RRC, and after UE receives RRC connection re-establishment message, UE signaling bear is established using the second switchable resource, rebuilds
RRC successes then send RRC connection re-establishment completion messages to eNB2.Second target BS sends RRC connections to UE and reconfigured, UE
RRC is configured using the second switchable resource, is configured by signaling bear and data bearer parameters, configuration successful causes UE according to second
Switchable resource accesses to the success of the second target BS, then sends RRC connections configuration completion message to eNB2.
Step S660, the second target BS transmitting path handover request, so that Deta bearer passage switches to the second target
Base station.
Specifically, the second target BS sends road directly to MME or by transit node such as HeNB GW, X2 GW to MME
Footpath handover request, by core net and eNB1 Deta bearer passage, switch to core net and eNB2 Deta bearer passage, path
Switch successfully MME return path switching request acknowledgement messages.Second target BS receives path switching request acknowledgement message, may be used also
The switching of first object base station secondary is notified to complete, in order to which first object base station is handled accordingly.
In the present embodiment, switching information record message is sent to switching record node by first object base station, so as to cut
Record nodes records handover information first is changed, first object base station is that source base station is small according to the target physical of reported by user equipment UE
The target BS that area's mark determines, target physical cell ID are the small of the second target BS for meeting handoff threshold that UE is determined
The Physical Cell Identifier in area, if the first switchable resource that UE is distributed using first object base station accesses to the mistake of the second target BS
Lose, it is first object base station that the second target BS inquiry switching record node, which obtains handover-target base station first, first object base
Stand to coordinate with the second target BS and carry out secondary switching preparation, the second target BS distributes the second switchable resource, first object base
Stand to send to source base station and switch completion notice first, the second target BS sends RRC connection re-establishments and connected with RRC to UE matches somebody with somebody again
Put, RRC is configured using the second switchable resource so that UE accesses to the success of the second target BS according to the second switchable resource, to institute
State the second target BS send configuration success response, the second target BS transmitting path handover request, so that Deta bearer passage
The second target BS is switched to, even if the Physical Cell Identifier of neighbor cell is identical, causes handoff failure first, can also pass through head
Secondary handover information obtains handoff error target BS first, so as to carry out the resource between false target base station and correct target BS
Reconfigure so that switch successfully again, improve the success rate of cell switching.
In one embodiment, switching record node includes server, family according to the type of switching type and target BS
At least one of front yard macro base station gateway, X2 gateways.
Specifically, due to the difference of target BS type, the switching type of selection is different, the required node of handoff procedure
Difference, S1 can be individually established with MME if target BS is eNB and be connected, also X2 can be established between the eNB of periphery is connected, no
Family's macro base station gateway, X2 gateways are needed, then switching record node can be independent server, there is provided to the branch of switching flow
Hold.If target BS is HeNB, then needs to establish S1 with MME after HeNB GW carry out S1 convergences and be connected, can be between HeNB
X2 connections directly are established, between HeNB and eNB, you can, can also be by X2 GW routing forwardings, then directly to establish X2 connections
Independent server can be not provided with, directly switching record node is arranged in family's macro base station gateway or X2 gateways.It can manage
Solution, switching record node can include multiple, and such as when switching to switching of the macro base station to macro base station, switching records node
For server.When switching to macro base station to switch to the S1 of family's macro base station, switching record node includes server, the grand base of family
Stand at least one of gateway.When switching to macro base station to switch to the X2 of family's macro base station, switching record node includes service
At least one of device, family's macro base station gateway, X2 gateways.Switching record is disposed according to the type of switching type and target BS
Node, resource can be saved, flexibly and easily.
In one embodiment, source base station is macro base station, first object base station be in macro base station, family's macro base station at least
One kind, the second target BS are at least one of macro base station, family's macro base station, wherein first object base station and the second target base
The base station type stood is identical, switches to S1 switchings or X2 switchings.
Specifically, source base station is to the handoff scenario of target BS can be divided into S1 switchings of the eNB to eNB, eNB is to eNB's
The X2 switchings of S1 switchings, eNB to HeNB of X2 switchings, eNB to HeNB.X2 switchings of the wherein eNB to HeNB is divided into again X2 GW
X2 switching, without X2 GW X2 switching.It can guarantee that the raising of handover success rate is applied to different handoff scenarios.
In one embodiment, after step S660, in addition to：Second target BS sends secondary to first object base station
Switch completion notice, first object base station sends data dump message to switching logging modle, to remove handover information first.
Specifically, memory space can be saved by removing handover information first, invalid data are avoided to look into next handover information
Interference is ask, improves response speed.
Due to different handoff scenarios, the specific steps of the method for cell switching are variant, below in conjunction with the accompanying drawings to cell
The implementation of the method for switching is described in further detail for common typical scene, it is to be understood that the side of cell switching
The application of method is not limited to following application scenarios.
Scene one, eNB carry out S1 switchings to periphery eNB, and switching record node can be deployed on independent server, accompanying drawing
3 describe the implementation steps figure that eNB carries out S1 switchings to periphery eNB, and source eNB is handover source base station first in figure；ENB1 is mistake
Target BS by mistake, i.e. first object base station, and secondary handover source base station.ENB2 is it is expected target BS, i.e. the second target base
Stand, Server is independent server, and first object base station is responsible for notifying server record and removes handover information.Cell switches
Method comprise the following steps that：
101 UE measurements determine that eNB2 meets handoff threshold；
102 UE reporting measurement reports carry eNB2 PCI to source eNB；
103 source eNB search the neighboring BS information safeguarded by PCI, and confirmation target BS is eNB1；
104 source eNB initiate S1 switchings to MME and prepare message Handover Required, target switching
Base station is eNB1；
105 MME initiate handover request message Handover Request to eNB1；
106 eNB1 are that UE distributes the first switchable resource, and return to switching request acknowledgement message Handover
Request ACK to MME；
107 MME issue switching command Handover Command to source eNB；
108 source eNB issue RRC connections configuration message RRC Connection to UE
Reconfiguration；
109 eNB1 send switching information record and notified to Server；
110 Server record handover information first；
111 UE send RRC connections configuration completion message RRC Connection to eNB2
Reconfiguration Complete, perform switching, are provided using the first switching of eNB1 distribution
Source switches to eNB2；
112 UE send to eNB2 after handoff failure and re-establish request message, carrying cause value is handoff failure；
113 eNB2 initiate inquiry handover-target base station process first, Query Result eNB1 to Server；
114 eNB1 and eNB2, which coordinate, carries out secondary switching preparation, and eNB2 distributes the second switchable resource；
115 eNB1 send switching notice Handover Notify to MME, and notice first complete by switching；
116 MME send UE context release command UE Context Release to source eNB
Commnad, discharge UE context resources；
117 source eNB discharge resource, and UE context Release complete UE Context are responded to MME
Release Complete；
118 eNB2 send RRC connection re-establishment message RRC Connection to UE
Reestablishment message, RRC is established using new resources；
119 UE send RRC connection re-establishment completion message RRC Connection to eNB2
Reestablishment Complete, re-establish success；
120 eNB2 send RRC connection reconfiguration message RRC Connection to UE
Reconfiguration message, RRC is configured using new resources；
121 UE send RRC Connection Reconfiguration Complete message to eNB2, match somebody with somebody
It is set to work(；
122 eNB2 are to MME transmitting path handover request message Path Switch Request, request path
Switching；
123 MME to eNB2 Response Path switching request acknowledgement message Path Switch Request ACK,
Path switches successfully；
124 eNB2 notify secondary switching to complete to eNB1；
125 eNB1 send handover information to Server and remove message；
126 Server remove switching information record.
Scene two, eNB carry out X2 switchings to periphery eNB, and switching record node can be deployed on independent server, accompanying drawing
4 describe the implementation steps figure that eNB carries out X2 switchings to periphery eNB, and source eNB is handover source base station first in figure；ENB1 is mistake
Target BS by mistake, i.e. first object base station, and secondary handover source base station.ENB2 is it is expected target BS, i.e. the second target base
Stand, Server is independent server, and first object base station is responsible for notifying server record and removes handover information.Cell switches
Method comprise the following steps that：
201 UE measurements determine that eNB2 meets handoff threshold；
202 UE reporting measurement reports carry eNB2 PCI to source eNB；
203 source eNB search the neighboring BS information safeguarded by PCI, and confirmation target BS is eNB1；
204 source eNB initiate X2 handover request message Handover Request to eNB1；
205 eNB1 are that UE distributes the first switchable resource, and return to Handover Request ACK extremely
eNB1；
206 source eNB issue RRC Connection Reconfiguration message to UE；
207 eNB1 send switching information record and notified to Server；
208 Server record handover information first；
209 UE send RRC Connection Reconfiguration Complete message to eNB2, hold
Row switching, eNB2 is switched to using eNB1 the first switchable resources distributed；
210 UE send to eNB2 after handoff failure and re-establish request message, carry cause value as switching
Failure；
211 eNB2 initiate inquiry handover-target base station process first to Server, are as a result eNB1；
212 eNB1 and eNB2, which coordinate, carries out secondary switching preparation, and eNB2 distributes the second switchable resource；
213 eNB2 send RRC Connection Reestablishment message to UE, use new resources
Establish RRC；
214 UE send RRC Connection Reestablishment Complete message, weight to eNB2
It is successfully established；
215 eNB2 send RRC Connection Reconfiguration message to UE, use new resources
Configure RRC.
216 UE send RRC Connection Reconfiguration Complete message to eNB2, match somebody with somebody
It is set to work(；
217 eNB2 send Path Switch Request message, request path switching to MME；
218 MME respond Path Switch Request ACK messages to eNB2, and path switches successfully；
219 eNB2 notify secondary switching to complete to eNB1；
220 eNB1 send UE Context Release message, source eNB release releases UE to source eNB
Context resource；
221 eNB1 send handover information to Server and remove message；
222 Server remove switching information record.
Scene three, eNB carry out S1 switchings to periphery HeNB.Disposed for HeNB, S1 convergence logical nes HeNB be present
GW, when S1 switchings are carried out from eNB to HeNB, it can also be deployed in independence by switching record node deployment on HeNB GW
On server, accompanying drawing 5 describes the implementation steps figure that eNB carries out S1 switchings to periphery HeNB, and source eNB is handover source first in figure
Base station；HeNB1 is false target base station, i.e. first object base station, and secondary handover source base station；HeNB2 is expectation target base
Stand, i.e. the second target BS, switching record node deployment on HeNB GW, be responsible for notifying HeNB GW records by first object base station
With removing handover information.The method of cell switching comprises the following steps that：
301 UE measurements determine that HeNB2 meets handoff threshold；
302 UE reporting measurement reports carry HeNB2 PCI to source eNB；
303 source eNB search the neighboring BS information safeguarded by PCI, and confirmation target BS is HeNB1；
304 source eNB initiate S1 switchings to MME and prepare message Handover Required, target switching
Base station is HeNB1；
305 MME initiate Handover Request message to HeNB GW, and targeted handoff base station is
HeNB1；
306 HeNB GW initiate Handover Request message to HeNB1；
307 HeNB1 are that UE distributes the first switchable resource, and return to Handover Request ACK extremely
HeNB GW；
308 HeNB GW forward Handover Request ACK to MME；
309 MME issue Handover Command message to source eNB；
310 source eNB issue RRC Connection Reconfiguration message to UE；
311 HeNB1 send switching information record and notified to HeNB GW；
312 HeNB GW record handover information first；
313 UE send RRC Connection Reconfiguration Complete message to HeNB2, hold
Row switching, eNB2 is switched to using eNB1 the first switchable resources distributed；
314 UE send to HeNB2 after handoff failure and re-establish request message, carry cause value to cut
Change unsuccessfully；
To HeNB GW initiations inquiry, handover-target base station process, Query Result are 315 HeNB2 first
HeNB1；
316 HeNB1 and HeNB2, which coordinate, carries out secondary switching preparation, and HeNB2 distributes the second switchable resource；
317 HeNB1 send Handover Notify to HeNB GW, and notice first complete by switching；
318 HeNB forward Handover Notify to MME；
319 MME send UE Context Release Commnad message to source eNB, discharge on UE
Context resource；
320 source eNB discharge resource, and UE Context Release Complete are responded to MME；
321 HeNB2 send RRC Connection Reestablishment message to UE, use new resources
Establish RRC；
322 UE send RRC Connection Reestablishment Complete message to HeNB2,
Re-establish success；
323 HeNB2 send RRC Connection Reconfiguration message to UE, use new resources
Configure RRC；
324 UE send RRC Connection Reconfiguration Complete message to HeNB2, match somebody with somebody
It is set to work(；
325 HeNB2 send Path Switch Request message, request path switching to HeNB GW；
326 HeNB GW forward Path Switch Request message to MME；
327 MME respond Path Switch Request ACK messages to HeNB GW, and path switches to
Work(；
328 HeNB GW respond Path Switch Request ACK messages to HeNB2；
329 HeNB2 notify secondary switching to complete to HeNB1；
330 HeNB1 send handover information to HeNB GW and remove message；
331 HeNB GW remove switching information record.
Scene four, eNB carry out X2 switchings to periphery HeNB (having X2 GW).Disposed for HeNB, eNB and HeNB can lead to
X2 GW routing forwardings are crossed, i.e. X2 message between eNB and HeNB is encapsulated in X2AP MESSAGE TRANSFER message, by X2
GW carries out two-way route.Under this X2GW routing forwardings scene, can will switching record node deployment on X2 GW or
On HeNB GW, naturally it is also possible to be deployed on separate server.HeNB GW and X2 GW are often deployed in one in actual use
Rise, but logic function is separated, in the following description, is still described according to two logical nes.Accompanying drawing 6 describes eNB
Switch the implementation steps figure of (there are X2 GW) to HeNB X2, wherein, source eNB is handover source base station, HeNB1 are wrong mesh first
Mark base station, i.e. first object base station, and secondary handover source base station；HeNB2 is it is expected target BS, i.e. the second target BS；
Switching record node deployment is on X2 GW, and first object base station is responsible for notifying X2 GW records and removes handover information, and cell is cut
The method changed comprises the following steps that：
401 UE measurements determine that HeNB2 meets handoff threshold；
402 UE reporting measurement reports give source eNB, carry HeNB2 PCI；
403 source eNB search the neighboring BS information safeguarded by PCI, and confirmation target BS is HeNB1；
404 source eNB initiate X2 handover request Handover Request to X2 GW；
405 X2 GW are to HeNB1 routing forwarding message Handover Request；
406 HeNB1 are that UE distributes the first switchable resource, and respond Handover Request ACK extremely
X2 GW；
407 X2 GW routing forwarding message Handover Request ACK to source eNB；
408 source eNB issue RRC Connection Reconfiguration message to UE；
409 HeNB1 send switching information record and notify to give X2 GW；
410 X2 GW record handover information first；
411 UE send RRC Connection Reconfiguration Complete message to HeNB2, hold
Row switching, eNB2 is switched to using eNB1 the first switchable resources distributed；
412 UE send to HeNB2 after handoff failure and re-establish request message, carry cause value to cut
Change unsuccessfully；
To X2 GW initiations inquiry, handover-target base station process, Query Result are 413 HeNB2 first
HeNB1；
414 HeNB1 and HeNB2, which coordinate, carries out secondary switching preparation, and HeNB2 distributes the second switchable resource；
415 HeNB2 send RRC Connection Reestablishment message to UE, use new resources
Establish RRC.
416 UE send RRC Connection Reestablishment Complete message to HeNB2,
Re-establish success；
417 HeNB2 send RRC Connection Reconfiguration message to UE, use new resources
Configure RRC.
418 UE send RRC Connection Reconfiguration Complete message to HeNB2, match somebody with somebody
It is set to work(；
419 HeNB2 send Path Switch Request message, request path switching to HeNB GW；
420 HeNB GW forward Path Switch Request message to MME；
421 MME respond Path Switch Request ACK messages to HeNB GW, and path switches to
Work(；
422 HeNB GW respond Path Switch Request ACK messages to HeNB2；
423 HeNB2 notify secondary switching to complete to HeNB1；
424 HeNB1 send UE Context Release message, notice source eNB releases UE to X2 GW
Context resource；
425 X2 GW routing forwarding UE Context Release message are to source eNB；
426 eNB1 send handover information to X2 GW and remove message；
427 X2 GW remove switching information record.
Scene five, eNB carry out X2 switchings to periphery HeNB (no X2 GW).ENB can directly establish X2 with HeNB and be connected,
In such a scenario, switching logging modle can be deployed on HeNB GW, can also be deployed on separate server.Accompanying drawing 7
The implementation steps figure that eNB switches (no X2 GW) to HeNB X2 is described, wherein, source eNB is handover source base station first, HeNB1
For false target base station, i.e. first object base station, and secondary handover source base station；HeNB2 is it is expected target BS, i.e. the second mesh
Mark base station；Switching record node deployment on HeNB GW, be responsible for notifying HeNB GW records and remove switching by first object base station
Information, the method for cell switching comprise the following steps that：
501 UE measurements determine that HeNB2 meets handoff threshold；
502 UE reporting measurement reports give source eNB, carry HeNB2 PCI；
503 source eNB search the neighboring BS information safeguarded by PCI, and confirmation target BS is HeNB1；
504 source eNB initiate X2 handover request Handover Request to HeNB1；
505 HeNB1 are that UE distributes the first switchable resource, and respond Handover Request ACK to source
eNB；
506 source eNB issue RRC Connection Reconfiguration message to UE；
507 HeNB1 send switching information record and notify to give HeNB GW；
508 HeNB GW record handover information first；
509 UE send RRC Connection Reconfiguration Complete message to HeNB2, hold
Row switching, eNB2 is switched to using eNB1 the first switchable resources distributed；
510 UE send to HeNB2 after handoff failure and re-establish request message, carry cause value to cut
Change unsuccessfully；
To HeNB GW initiations inquiry, handover-target base station process, Query Result are 511 HeNB2 first
HeNB1；
512 HeNB1 and HeNB2, which coordinate, carries out secondary switching preparation, and HeNB2 distributes the second switchable resource.
513 HeNB2 send RRC Connection Reestablishment message to UE, use new resources
Establish RRC.
514 UE send RRC Connection Reestablishment Complete message to HeNB2,
Re-establish success；
515 HeNB2 send RRC Connection Reconfiguration message to UE, use new resources
Configure RRC.
516 UE send RRC Connection Reconfiguration Complete message to HeNB2, match somebody with somebody
It is set to work(；
517 HeNB2 send Path Switch Request message, request path switching to HeNB GW；
518 HeNB GW forward Path Switch Request message to MME；
519 MME respond Path Switch Request ACK messages to HeNB GW, and path switches to
Work(；
520 HeNB GW respond Path Switch Request ACK messages to HeNB2；
521 HeNB2 notify secondary switching to complete to HeNB1；
522 HeNB1 send UE Context Release message, notice source eNB releases UE to source eNB
Context resource；
523 eNB1 send handover information to HeNB GW and remove message；
524 HeNB GW remove switching information record.
In one embodiment, as shown in Figure 8, there is provided a kind of system of cell switching, including：
Secondary handover source base station processing module 710, for making first object base station send switching letter to switching record node
Breath record message, so that handover information, first object base station are source base station according to user equipment to switching record nodes records first
The target BS that the target physical cell ID that UE is reported determines, target physical cell ID meet handoff threshold for what UE was determined
The second target BS cell Physical Cell Identifier.
Secondary handover-target base station processing module 720, if the first switching distributed for UE using first object base station
Resource accesses to the failure of the second target BS, the second target BS inquiry switching record node is obtained handover-target base station first
For first object base station.
Secondary handover source base station processing module 710 is additionally operable to coordinate with secondary handover-target base station processing module 720, makes
One target BS and the second target BS, which coordinate, carries out secondary switching preparation, and the second target BS distributes the second switchable resource.
Secondary handover source base station processing module 710 is additionally operable to make first object base station send switching completion first to source base station
Notice.
Secondary handover-target base station processing module 720 is additionally operable to make the second target BS send wireless heterogeneous networks to UE
RRC connection re-establishments connect with RRC to be reconfigured, and configures RRC using the second switchable resource so that UE connects according to the second switchable resource
Enter to the success of the second target BS, to the second target BS send configuration success response.
Secondary handover-target base station processing module 720 is additionally operable to make the second target BS transmitting path handover request, so that
Deta bearer passage switches to the second target BS.
In one embodiment, switching record node includes server, family according to the type of switching type and target BS
At least one of front yard macro base station gateway, X2 gateways.
In one embodiment, source base station be macro base station, first object base station be in macro base station, family's macro base station at least
One kind, the second target BS are at least one of macro base station, family's macro base station, wherein first object base station and the second target base
The base station type stood is identical, switches to S1 switchings or X2 switchings.
In one embodiment, secondary handover-target base station processing module 720 is additionally operable to make the second target BS to first
Target BS sends secondary switching completion notice, secondary handover source base station processing module 710 be additionally operable to make first object base station to
Switch logging modle and send data dump message, to remove handover information first.
In one embodiment, as shown in Figure 9, there is provided a kind of system of cell switching, including：First object base station
810th, the second target BS 820, switching record node 830.
First object base station 810, for sending switching information record message to switching record node 830, so that switching is remembered
Record node 830 records handover information first, and first object base station is that source base station is small according to the target physical of reported by user equipment UE
The target BS that area's mark determines, target physical cell ID are the small of the second target BS for meeting handoff threshold that UE is determined
The Physical Cell Identifier in area.
Second target BS 820, if accessing to for UE the first switchable resources distributed using first object base station
Two target BS fail, and it is first object base station that inquiry switching record node 830, which obtains handover-target base station first,.
First object base station 810, which is additionally operable to coordinate with the second target BS 820, carries out secondary switching preparation.
Second target BS 820 is additionally operable to distribute the second switchable resource.
First object base station 810 is additionally operable to send to source base station switches completion notice first.
Second target BS 820 is additionally operable to send radio resource control RRC connection re-establishment to UE and connect with RRC to match somebody with somebody again
Put, use the second switchable resource configuration RRC so that UE accesses to the success of the second target BS according to the second switchable resource, to the
Two target BS send configuration success responses.
Second target BS 820 is additionally operable to transmitting path handover request, so that Deta bearer passage switches to the second target
Base station.
In one embodiment, source base station is macro base station, and first object base station 810 is in macro base station, family's macro base station
At least one, the second target BS 820 are macro base station, at least one of family's macro base station, wherein first object base station 810 with
The base station type of second target BS 820 is identical, switches to S1 switchings or X2 switchings.
In one embodiment, switching record node 830 according to the type of switching type and target BS include server,
At least one of family's macro base station gateway, X2 gateways.
One of ordinary skill in the art will appreciate that realize all or part of flow in above-described embodiment method, being can be with
The hardware of correlation is instructed to complete by computer program, described program can be stored in a computer read/write memory medium
In, in the embodiment of the present invention, the program can be stored in the storage medium of computer system, and by the computer system
At least one computing device, to realize the flow for including the embodiment such as above-mentioned each method.Wherein, the storage medium can be
Magnetic disc, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access
Memory, RAM) etc..
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope that this specification is recorded all is considered to be.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously
Can not therefore it be construed as limiting the scope of the patent.It should be pointed out that come for one of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (11)
1. a kind of method of cell switching, methods described include：
First object base station sends switching information record message to switching record node, so that the switching record nodes records are first
Secondary handover information, the first object base station are what source base station determined according to the target physical cell ID of reported by user equipment UE
Target BS, the target physical cell ID are the physics of the cell for the second target BS for meeting handoff threshold that UE is determined
Cell ID；
If the first switchable resource that UE is distributed using first object base station accesses to the failure of the second target BS, second mesh
It is the first object base station that switching record node, which obtains handover-target base station first, described in mark base station inquiry；
The first object base station coordinates with second target BS carries out secondary switching preparation, second target BS point
With the second switchable resource；
The first object base station is sent to the source base station switches completion notice first；
Second target BS is connected with RRC to UE transmission radio resource control RRC connection re-establishments and reconfigured, using described
Second switchable resource configures RRC so that UE accesses to the success of the second target BS according to second switchable resource, to described the
Two target BS send configuration success responses；
The second target BS transmitting path handover request, so that Deta bearer passage switches to the second target BS.
2. according to the method for claim 1, it is characterised in that the switching record node is according to switching type and target base
The type stood includes at least one of server, family's macro base station gateway, X2 gateways.
3. according to the method for claim 1, it is characterised in that the source base station is macro base station, the first object base station
For at least one of macro base station, family's macro base station, second target BS is at least one in macro base station, family's macro base station
Kind, wherein the first object base station is identical with the base station type of the second target BS, it is described to switch to S1 switchings or X2 switchings.
4. according to the method for claim 1, it is characterised in that the second target BS transmitting path handover request, with
After the step of making Deta bearer passage switch to the second target BS, in addition to：
Second target BS sends secondary switching completion notice to first object base station；
The first object base station sends data dump message to switching logging modle, with handover information first described in removing.
5. according to the method for claim 1, it is characterised in that when it is described switch to X2 to switch when, the first object base
Stand and send the step of switching completion notice first in the second target BS transmitting path handover request to the source base station, with
Performed after the step of making Deta bearer passage switch to the second target BS.
6. a kind of system of cell switching, it is characterised in that the system includes：
Secondary handover source base station processing module, disappear for making first object base station send switching information record to switching record node
Breath, so that handover information, the first object base station are source base station according to user equipment to the switching record nodes records first
The target BS that the target physical cell ID that UE is reported determines, the target physical cell ID are the satisfaction switching that UE is determined
The Physical Cell Identifier of the cell of second target BS of thresholding；
Secondary handover-target base station processing module, if accessed for UE the first switchable resources distributed using first object base station
Fail to the second target BS, the second target BS inquiry switching record node is obtained handover-target base station first
For the first object base station；
The secondary handover source base station processing module is additionally operable to coordinate with secondary handover-target base station processing module, makes described first
Target BS coordinates with second target BS carries out secondary switching preparation, the second switching of the second target BS distribution money
Source；
The secondary handover source base station processing module is additionally operable to make the first object base station cut first to source base station transmission
Change completion notice；
The secondary handover-target base station processing module is additionally operable to make second target BS send wireless heterogeneous networks to UE
RRC connection re-establishments connect with RRC to be reconfigured, and configures RRC using second switchable resource so that UE is cut according to described second
Change resource and access to the success of the second target BS, to the second target BS send configuration success response；
The secondary handover-target base station processing module is additionally operable to make the second target BS transmitting path handover request, so that
Deta bearer passage switches to the second target BS.
7. system according to claim 6, it is characterised in that the switching record node is according to switching type and target base
The type stood includes at least one of server, family's macro base station gateway, X2 gateways.
8. system according to claim 6, it is characterised in that the source base station is macro base station, the first object base station
For at least one of macro base station, family's macro base station, second target BS is at least one in macro base station, family's macro base station
Kind, wherein the first object base station is identical with the base station type of the second target BS, it is described to switch to S1 switchings or X2 switchings.
9. a kind of system of cell switching, it is characterised in that the system includes：First object base station, the second target BS, cut
Change record node；
The first object base station, for sending switching information record message to switching record node, so that the switching record
Handover information, the first object base station are target physical of the source base station according to reported by user equipment UE first described in nodes records
The target BS that cell ID determines, the target physical cell ID are the second target base for meeting handoff threshold that UE is determined
The Physical Cell Identifier for the cell stood；
Second target BS, if accessing to the second mesh for UE the first switchable resources distributed using first object base station
Base station failure is marked, it is the first object base station to inquire about the switching record node and obtain handover-target base station first；
The first object base station, which is additionally operable to coordinate with the second target BS, carries out secondary switching preparation；
Second target BS is additionally operable to distribute the second switchable resource；
The first object base station is additionally operable to send to the source base station switches completion notice first；
Second target BS is additionally operable to connect with RRC to UE transmission radio resource control RRC connection re-establishments and reconfigured, and makes
RRC is configured with second switchable resource so that UE accesses to the success of the second target BS according to second switchable resource, to
The second target BS send configuration success response；
Second target BS is additionally operable to transmitting path handover request, so that Deta bearer passage switches to the second target base
Stand.
10. system according to claim 9, it is characterised in that the source base station is macro base station, the first object base station
For at least one of macro base station, family's macro base station, second target BS is at least one in macro base station, family's macro base station
Kind, wherein the first object base station is identical with the base station type of the second target BS, it is described to switch to S1 switchings or X2 switchings.
11. system according to claim 9, it is characterised in that the switching record node is according to switching type and target
The type of base station includes at least one of server, family's macro base station gateway, X2 gateways.
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| CN201610316523.6A CN107371198B (en) | 2016-05-12 | 2016-05-12 | Method and system for cell switching |
| PCT/CN2016/104301 WO2017193555A1 (en) | 2016-05-12 | 2016-11-02 | Cell handover method and system |
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| CN201610316523.6A CN107371198B (en) | 2016-05-12 | 2016-05-12 | Method and system for cell switching |
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| CN111194058A (en) * | 2018-11-14 | 2020-05-22 | 华为技术有限公司 | Out-of-order control method and device for downlink data |
| US12052626B2 (en) | 2021-12-23 | 2024-07-30 | T-Mobile Usa, Inc. | Steering non-mobile connected-mode user equipment to higher capacity radio cells |
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| EP3827615A4 (en) * | 2018-09-25 | 2022-04-27 | Nokia Solutions and Networks Oy | Context preparation for consecutive conditional handovers |
| CN112399489B (en) * | 2019-08-14 | 2024-07-12 | 夏普株式会社 | Cell switching method and user equipment |
| CN113766587A (en) * | 2021-09-02 | 2021-12-07 | 恒安嘉新（北京）科技股份公司 | Method, device and equipment for determining switching type and storage medium |
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| CN109982394A (en) * | 2017-12-27 | 2019-07-05 | 中国移动通信集团北京有限公司 | A kind of method and device of Signalling exchange |
| CN109982394B (en) * | 2017-12-27 | 2021-03-16 | 中国移动通信集团北京有限公司 | Signaling interaction method and device |
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| CN111194058B (en) * | 2018-11-14 | 2021-01-12 | 华为技术有限公司 | Out-of-order control method and device for downlink data |
| US11910244B2 (en) | 2018-11-14 | 2024-02-20 | Huawei Technologies Co., Ltd. | Method and apparatus for controlling disorder of downlink data |
| US12052626B2 (en) | 2021-12-23 | 2024-07-30 | T-Mobile Usa, Inc. | Steering non-mobile connected-mode user equipment to higher capacity radio cells |
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| WO2017193555A1 (en) | 2017-11-16 |
| CN107371198B (en) | 2020-07-10 |
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