CN105228200A - The fast cell changing method that a kind of network assistance UE controls and device - Google Patents
The fast cell changing method that a kind of network assistance UE controls and device Download PDFInfo
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- CN105228200A CN105228200A CN201510642978.2A CN201510642978A CN105228200A CN 105228200 A CN105228200 A CN 105228200A CN 201510642978 A CN201510642978 A CN 201510642978A CN 105228200 A CN105228200 A CN 105228200A
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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
- H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
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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
- H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point
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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
- H04W36/0077—Transmission or use of information for re-establishing the radio link of access information of target access point
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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
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
Abstract
The invention discloses fast cell changing method and the device of the control of a kind of network assistance user equipment (UE), for carrying out fast cell switching.This fast cell changing method comprises: source base station obtains one or more candidate cell according to the Neighboring Cell List of configuration; Source base station prepares resource for UE switches alternately with the base station belonging to candidate cell respectively; Source base station organization network supplementary, then passes through radio resource control RRC connection reconfiguration message arrangement to UE; UE according to configuration switching mode measure, during switch decision from configuration candidate cell preferably one as switching target small area, the Target cell of right backward selection is carried out synchronously.The present invention controls switching mode by network assistance UE, optimize switching flow, decrease handover delay, reduce the risk of UE call drop in cell merge, improve handover success rate, ensure that the continuity of business, improve the experience of user, be particularly useful for the high mobility scene such as high ferro or course line covering.
Description
Technical field
The present invention relates in Long Term Evolution (LTE:Long-TermEvolution) communication system, cell merge problem, especially fast cell switching problem under the high mobility scene such as high-speed railway.
Background technology
In order to ensure to be in wireless heterogeneous networks (RRC, RadioResourceConnection) subscriber equipment (UE of connected state RRC_CONNECTED, UserEquipment) business continuance, LTE system adopts the auxiliary mode of network control UE to switch.Whole switching flow comprises switching preparation, switching performs and switching completes three phases.Concrete switching flow is as follows:
In handoff preparation phase, source base station (note: in LTE system, base station refers to evolved node B (eNB, EvolvedNodeB) UE) is received according to after measuring the measurement report that reports of configuration requirement, based on the channel quality information of the local area carried in measurement report and adjacent area, be specially Reference Signal Received Power (RSRP, or Reference Signal Received Quality (RSRQ ReferenceSignalReceivedPower), ReferenceSignalReceivedQuality), and wireless resource management information carries out handover decisions, select final handover candidate cells list, optimum switching target small area is selected from candidate list, source base station sends handover request to target BS, and target BS carries out call access control, for UE prepares switchable resource, replys switching request response to source base station.
In handover execution stage, source base station sends the switching command of target BS generation to UE, and instruction UE switches to Target cell; Source base station carries out up-downgoing data inverse-transmitting to target BS.UE is successfully linked into Target cell and sets up uplink synchronous, sends to switch to confirm to target BS, carries out switching and completes the stage.
Complete the stage in switching, core network element completes the conversion of downlink path, and target BS sends according to the order of sequence to forward pass and the new data received, meanwhile, and source base station release UE context.
In existing cell switching method, need experience to switch after UE reporting measurement reports and prepare could realize setting up with Target cell eating dishes without rice or wine to be connected with switching two stages of execution, handover delay is long, adds the risk of UE call drop, especially the high mobility scene such as high-speed railway.
Summary of the invention
Given this, the object of this invention is to provide the fast cell changing method that a kind of network assistance UE controls, make it the above deficiency overcoming prior art.
The technical solution adopted for the present invention to solve the technical problems is as follows:
1. a fast cell changing method for network assistance UE control, is applied in high mobility scene, it is characterized in that, comprise following step:
The first step: source base station obtains one or more candidate cell according to the Neighboring Cell List of configuration;
Second step: source base station prepares resource for UE switches alternately with the base station belonging to candidate cell respectively, and the candidate cell obtaining correspondence is the information that the wave point switching preparation is correlated with;
3rd step: source base station organization network supplementary, comprises the information that the wave point of switching mode and switching judgment information, candidate cell mark and candidate cell is relevant, then connects reconfiguration message by RRC and configure to UE;
4th step: UE measures, UE measures corresponding parameter according to the switching mode of configuration, then carries out switch decision, from the candidate cell of configuration preferably one as switching target small area, the Target cell of right backward selection is carried out synchronously, and reports switch indicating information;
5th step: perform switching and complete the stage, source base station, respectively to base station transmission handover cancelling message that is not selected but that switch belonging to the successful candidate cell of preparation, is released to switchable resource and the context of UE distribution.
When described step 1 source base station obtains handover candidate cells, the formation that source base station obtains the adjacent area collection of configuration is:
The adjacent area quantity concentrated when adjacent area is greater than preset gate in limited time, according to geography information or/and translational speed information is or/and historical information concentrates preferred one or more adjacent area as handover candidate cells from adjacent area; The adjacent area quantity concentrated when adjacent area is not more than preset gate in limited time, and alternatively community, all adjacent areas is concentrated in adjacent area.
Prepare switchable resource in described 3rd step to comprise: source base station asks switching candidate target base station to be that UE prepares switchable resource by sending handover request message respectively; Candidate handover target base station is carried out call access control and is distributed switchable resource, then takes back the information that the evolved wireless access bearer E-RAB of receiving and wave point are correlated with to source base station by replying response message.
Switching mode described in 3rd step comprises based on measurement with based on geographical location information; If be configured to based on measurement, then switching judgment information carries measurement configuration information; If be configured to based on geographical location information, then switching judgment information carries the geographical location information (longitude and latitude) of handover candidate cells, and covering radius is with biased.
The invention has the beneficial effects as follows, on the basis of existing technology, switching mode is controlled by network assistance UE, optimize switching flow, decrease handover delay, reduce the risk of UE call drop in cell merge, improve handover success rate, ensure that the continuity of business, improve the experience of user, be particularly useful for the high mobility scene such as high ferro or course line covering.
Accompanying drawing explanation
Fig. 1 is overall process schematic diagram of the present invention.
Fig. 2 is the network assistance UE control switching schematic diagram based on X2.
Fig. 3 is the network assistance UE control switching schematic diagram based on S1.
Fig. 4 is the process chart that source base station obtains candidate cell.
Fig. 5 (a) is the process chart based on the preferred switching target small area of switching UE measured.
Fig. 5 (b) is the process chart of the preferred switching target small area of switching UE based on geographical location information.
Fig. 6 (a) is the process chart that source base station independently detects the data inverse-transmitting of triggering.
Fig. 6 (b) is the process chart of the data inverse-transmitting of UE notification source base station triggers.
Fig. 7 (a) is the process chart of the switching wait timeout based on X2.
Fig. 7 (b) is the process chart of the switching wait timeout based on S1.
Fig. 8 (a) is the process chart of switching target small area not in the candidate cell of configuration based on X2.
Fig. 8 (b) is the process chart of switching target small area not in the candidate cell of configuration based on S1.
Fig. 9 is the enforcement block diagram of network-assist information device of the present invention.
Figure 10 is the enforcement block diagram of switch processing device of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
Embodiment 1:
Overall process of the present invention as shown in Figure 1.
101st step: source base station obtains one or more candidate cell according to the Neighboring Cell List of configuration, jumps to the 102nd step;
102nd step: it is that UE switches the relevant information of the wave point for preparing that source base station obtains corresponding candidate cell to the base station belonging to candidate cell by handover request flow process respectively alternately, jumps to the 103rd step;
103rd step: source base station organization network supplementary, comprises the information that the wave point of switching mode and switching judgment information, candidate cell mark and candidate cell is relevant, then connects reconfiguration message by RRC and configure to UE, jump to the 104th step;
104th step: UE measures according to the switching mode of configuration, obtains measurement result; During switch decision, from configuration candidate cell preferably one as switching target small area, the Target cell of right backward selection is carried out synchronously, and reports switch indicating information, jumps to the 105th step;
105th step: perform switching and complete the stage.Then, source base station, respectively to not selected but switch the base station prepared belonging to successful candidate cell and send handover cancelling message, is released to switchable resource that UE distributes and context etc.
Embodiment 2:
Network assistance UE based on X2 controls to switch as shown in Figure 2.In this embodiment, total N number of selection candidate cell, and UE preferred candidate community 1 is as switching target small area.
201st step: source base station, according to the preferred N number of candidate cell in adjacent area of configuration, jumps to the 202nd step;
202nd step: it is that UE switches Resources allocation that source base station sends handover request message request respectively to target BS 1 to the N belonging to candidate cell, jumps to the 203rd step;
203rd step: target BS 1 to the N belonging to candidate cell carries out call access control successively, for UE switches Resources allocation; Target BS 1 to N belonging to candidate cell replys handover request response to source base station successively, carries the information that wave point is correlated with and the evolved wireless access bearer E-RAB be successfully established and sets up failed E-RAB etc., jumping to the 204th step;
204th ~ 205 steps: the network-assist information needed for source base station tissue switches, comprise the information that the wave point of switching mode and switching judgment information, candidate cell mark and candidate cell is relevant, wherein, described switching mode comprises based on measurement with based on geographical location information.If be configured to based on measurement, then switching judgment information carries measurement configuration information; If be configured to based on geographical location information, then switching judgment information carries the geographical location information (longitude and latitude) of handover candidate cells, covering radius and biased etc.Then connect reallocation message by RRC and send to UE; And the RRC connection reprovision of replying after receiving UE process success completes message, jumps to the 206th step;
206th step: UE measures corresponding parameter according to the switching mode of configuration, then carries out switch decision, from the candidate cell that network-assist information carries preferably one as switching target small area, jump to the 207th step;
207th step: downlink data anti-pass, comprise: source base station know UE start to Target cell switch, then respectively to target BS 1 to the base station N belonging to candidate cell transmit Sequence Number state transitions message migration switch during up-downgoing PDCP PDCP sequence number and Hyper Frame Number HFN; And be transmitted to target BS 1 to base station N belonging to candidate cell by receiving respectively from the downlink data of gateway S-GW, jump to the 208th step;
208th step: UE sends switch indicating information to target BS 1.Here, UE is synchronized to the Target cell of selection by random access procedure, to target BS 1 send switch indicating information instruction UE successful switch to Target cell, jump to the 209th step;
209th step: target BS 1, to Mobility Management Entity MME transmit path transition request message, is asked descending general packet wireless service tunnel protocol GTP tunnel to the conversion of a new GTP tunnel end points, jumped to the 210th step;
210th ~ 211 steps: MME sends amendment bearing request message request amendment carrying to S-GW, and receives the amendment bearing response message of S-GW reply, jumps to the 212nd step;
212nd step: MME sends the grouping of one or more end mark immediately after transduction pathway on old path, and is transmitted to target BS 1 by source base station, reorders, jump to the 213rd step with auxiliary mark base station 1;
213rd step: MME is to target BS 1 reverse-path convert requests response message, and the path of notification target base station evolution block core EPC has been changed successfully, jumps to the 214th step;
214th step: target BS 1 sends customer equipment context release message to source base station, instruction source base station releasing resource, jumps to the 215th step;
215th step: source base station prepares successfully but target BS 2 to N transmission handover cancelling message belonging to not selected candidate cell to switching successively, is released to the switchable resource of UE distribution and context etc.
Embodiment 3:
Network assistance UE based on S1 controls to switch as shown in Figure 3.In this embodiment, total N number of selection candidate cell, and UE preferred candidate community 1 is as switching target small area.
301st step: source base station, according to the preferred N number of candidate cell in adjacent area of configuration, jumps to the 302nd step;
302nd step: source base station sends handover request message respectively to MME, the resource of request target side prepares, and jumps to the 303rd step;
303rd step: MME sends handover request message respectively to target BS 1 to the N belonging to candidate cell, and request resource prepares, and jumps to the 304th step;
304th step: target BS 1 to the N belonging to candidate cell carries out call access control successively, for UE switches Resources allocation; Target BS 1 to N belonging to candidate cell replys handover request response to MME successively, carries the information that wave point is correlated with and the evolved wireless access bearer E-RAB be successfully established and sets up failed E-RAB etc., jumping to the 305th step;
305th step: MME sends switching command message to source base station successively, carries the information that wave point is correlated with and the evolved wireless access bearer E-RAB be successfully established and sets up failed E-RAB etc., jumping to the 306th step;
306th ~ 307 steps: the network-assist information needed for source base station tissue switches, comprise the information that the wave point of switching mode and switching judgment information, candidate cell mark and candidate cell is relevant, and send to UE by RRC connection reallocation message; And the RRC connection reprovision of replying after receiving UE process success completes message, jumps to the 206th step;
308th step: UE measures corresponding parameter according to the switching mode of configuration, then carries out switch decision, from the candidate cell that network-assist information carries preferably one as switching target small area, jump to the 309th step;
309th step: data inverse-transmitting, is specially: source base station sends base station state Transfer Message transfer PDCP sequence number to MME successively and receives and the state of transmission; MME sends mobile management entity state transitions message transfers PDCP sequence number respectively to target BS 1 to the N belonging to candidate cell and receives and the state of transmission; Downlink data anti-pass from S-GW to target BS 1 to the N belonging to candidate cell, is jumped to the 310th step by source base station;
310th step: UE sends switch indicating information to target BS 1.Here, UE is synchronized to the Target cell of selection by random access procedure, to target BS send switch indicating information instruction UE successful switch to Target cell, jump to the 311st step;
311st step: target BS 1 sends handoff notification message to MME, notice MMEUE is identified in Target cell, and S1 switching completes, and jumps to 312 steps;
312nd ~ 313 steps: MME, after relevant treatment, sends customer equipment context release command message to source base station, and the S1 logic of request release UE association connects; And the customer equipment context Release complete of replying after receiving source base station process success, jump to the 314th step;
314th step: source base station sends handover cancelling message respectively to MME, request switches and prepares successfully but target BS cancellation switching belonging to not selected candidate cell, jumps to the 315th step;
315th ~ 316 steps: MME to prepare successfully but target BS 2 to N belonging to not selected candidate cell sends customer equipment context release command message, the S1 logic connection that request release UE associates to switching successively; And receiving target base station 2 to N processes the customer equipment context Release complete of replying successively successfully, jump to the 317th step;
317th step: MME replys handover cancelling response message to source base station successively, confirms target BS 2 to the N handover cancelling belonging to not selected candidate cell.
Embodiment 4:
Source base station obtains the process of candidate cell as shown in Figure 4.
401st step: source base station obtains the adjacent area of this cell configuration, is designated as adjacent area collection, jumps to the 402nd step;
402nd step: judge that adjacent area concentrates the quantity of adjacent area whether to be greater than preset thresholding, if be greater than preset thresholding, jumps to the 403rd step, otherwise, jump to the 404th step;
403rd step: according to geographical location information, translational speed information or/and historical information concentrates preferred one or more candidate cell from adjacent area.
404th step: alternatively community, all adjacent areas is concentrated in adjacent area.
Embodiment 5:
When switching mode is based on measurement, the process of the preferred switching target small area of UE is as shown in Fig. 5 (a).
501st step: UE measures the channel quality of adjacent cell, exporting measurement result, comprising the RSRP of adjacent cell or/and RSRQ, jumping to the 502nd step when satisfying condition;
502nd step: filter measurement result, obtains the measurement result of the candidate cell configured, jumps to the 503rd step;
503rd step: the measurement result of the candidate cell obtained after filtration is sorted according to RSRP or RSRQ, jumps to the 504th step;
504th step: the candidate cell selecting RSRP or RSRQ best is as switching target small area.
When switching mode is based on geographical location information, the process of the preferred switching target small area of UE is as shown in Fig. 5 (b).
501st step: UE according to certain period measurement geographical location information, and exports the geographical location information at current place.Wherein, UE configures the such as module such as global position system GPS or the Big Dipper and can realize geography information measurement.Jump to the 502nd step;
The geographical location information of the handover candidate cells that the 502nd step: UE carries according to current geographical location information and network-assist information calculates the distance d of UE to handover candidate cells, jumps to the 503rd step;
503rd step: the difference of calculation plot covering radius r and distance d and biased offset, computing formula is: difference=coverage radius of cell r-(distance d+ is biased offset).Jump to the 504th step;
504th step: the handover candidate cells that filtering difference is less than 0, then sorts to handover candidate cells from big to small according to difference, and the handover candidate cells selecting difference maximum is as switching target small area.
Embodiment 6:
The process of source base station trigger data anti-pass is as shown in Fig. 6 (a).
601st step: source base station detects data transmission scenarios, jumps to the 602nd step;
602nd step: source base station judges whether data cannot arrive UE.If data cannot arrive UE, jump to the 603rd step; Otherwise, jump to the 604th step;
603rd step: source base station thinks that UE switches to Target cell, log-on data anti-pass.
604th step: source base station thinks UE still in cell-of-origin, not log-on data anti-pass.
Alternatively, source base station can also carry out data inverse-transmitting, as shown in Fig. 6 (b) by following process.
601st step: when UE prepares to switch to Target cell, notification source base station, jumps to the 602nd step;
602nd step: source base station log-on data anti-pass.
Embodiment 7:
Based on the process of the switching wait timeout of X2 as shown in Fig. 7 (a).
701st step: switch waiting timer time-out, jump to the 702nd step;
702nd step: source base station sends handover cancelling message respectively to target BS 1 to the N belonging to candidate cell, is released to switchable resource that UE distributes and context etc., jumps to the 703rd step;
703rd ~ 704 steps: source base station sends wireless heterogeneous networks to UE and connects reallocation message, deletes the information that the wave point of candidate cell and the correspondence configured is relevant; The wireless heterogeneous networks of replying after receiving UE process success connects reprovision and completes message.
Based on the process of the switching wait timeout of S1 as shown in Fig. 7 (b).
701st step: switch waiting timer time-out, jump to the 702nd step;
702nd step: source base station sends handover cancelling message respectively to MME, the switching cancelling target prepares, and jumps to the 703rd step;
703rd ~ 704 steps: MME sends customer equipment context release command message respectively to target BS 1 to the N belonging to candidate cell, and the S1 logic of release UE management connects; And receiving target base station processes the customer equipment context Release complete of replying successfully, jumps to the 705th step;
705th step: MME replys handover cancelling response message to source base station, confirms that target handover cancelling completes, jumps to the 706th step;
706th ~ 707 steps: source base station sends wireless heterogeneous networks to UE and connects reallocation message, deletes the information that the wave point of candidate cell and the correspondence configured is relevant; The wireless heterogeneous networks of replying after receiving UE process success connects reprovision and completes message.
Embodiment 8:
Be based on measurement for switching mode, when X2 switches, the process of switching target small area not in the candidate list of configuration is as shown in Fig. 8 (a).
801st step: UE measures, finds when performing switch decision that switching target small area is not in the candidate list of configuration, to source base station reporting measurement reports, jumps to the 802nd step;
802nd step: source base station sends handover cancelling message respectively to target BS 1 to the N belonging to candidate cell, cancels and switching, jump to the 803rd step;
803rd ~ 804 steps: source base station carries out switch decision, select new handover-target base station, and send handover request message to new handover-target base station, ask to prepare resource into switching; And the handoff request acknowledgment message of replying after receiving new handover-target base station process success, jump to the 805th step;
805th step: source base station sends Radio Resource connection control reallocation message to UE, carries switching command and deletes the network-assist informations such as candidate cell, jumping to 806 steps;
806th step: data inverse-transmitting.Source base station transmits Sequence Number to fresh target base station state transitions message, and the downlink data received from S-GW is transmitted to fresh target base station, jumps to the 807th step;
807th step: UE is synchronized to Target cell by Stochastic accessing, and connect reprovision by Radio Resource and complete message and carry switch acknowledgment message, jump to the 808th step;
808th step: perform switching and complete the stage, comprise and carry out path integration, source of release base station user context etc.
In addition, be based on measurement for switching mode, when S1 switches, the process of switching target small area not in the candidate list of configuration is as shown in Fig. 8 (b).
801st step: UE measures, finds when performing switch decision that switching target small area is not in the candidate list of configuration, to source base station reporting measurement reports, jumps to the 802nd step;
802nd ~ 805 steps: cancel original switching and prepare, be specially: source base station sends handover cancelling message to MME; Then MME sends customer equipment context release command message respectively to target BS 1 to the N belonging to candidate cell; Target BS 1 to N discharges UE context and replys customer equipment context Release complete to MME; MME replys handover cancelling response message to source base station and confirms handover cancelling, jumps to the 806th step;
806th ~ 809 steps: switch and prepare, be specially: source base station carries out switch decision, select new handover-target base station, and send handover request message to MME, request target resource prepares; MME sends handover request message request resource and prepares to fresh target base station; Call access control is carried out in fresh target base station, prepares switchable resource, and the backward MME of success replys the ready resource of handoff request acknowledgment message notice MME target; MME sends target side, switching command message notification source base station for switching all set resource to source base station, jumps to the 810th step;
810th step: source base station sends Radio Resource connection control reallocation message to UE, carries switching command and deletion comprises the network-assist informations such as candidate cell mark, jumps to 811 steps;
811st step: data inverse-transmitting, is specially: source base station sends base station state migration message migration PDCP sequence number to MME and receives and the state of transmission; MME sends Mobility Management Entity state transitions message migration PDCP sequence number and receives and the state of transmission to fresh target base station, and the downlink data received from S-GW is transmitted to fresh target base station, jumps to the 812nd step;
812nd step: UE is synchronized to Target cell by Stochastic accessing, and connect reprovision by Radio Resource and complete message and carry switch acknowledgment message, jump to the 813rd step;
808th step: perform switching and complete the stage, comprise and send handoff notification message to MME, MME release command source base station releasing user context etc.
Shown in Figure 9, network-assist information device comprises:
Network-assist information device comprises receiver module 910, and receiving from the target BS belonging to candidate cell for described source base station is the switchable resource information that described UE prepares; Knockdown block 920 is described UE organization network supplementary for described source base station; And sending module 930, send configuration messages for described source base station to described UE, described configuration messages comprises network-assist information.
Shown in Figure 10, switch processing device comprises:
Switch processing device comprises receiver module 1010, and receive the configuration messages issued from described source base station for described UE, described configuration messages comprises network-assist information; Measurement module 1020, the switching mode of carrying according to network-assist information for described UE performs measurement; Judging module 1030, carries out switch decision for described UE according to measurement result, preferred switching target small area from the candidate cell that network-assist information carries; And synchronization module 1040, the Target cell switched to preferred switching target small area or the instruction of described source base station for described UE is carried out synchronously.
Finally illustrate, although method, only for LTE communication system, is not limited only to this in the present invention, as long as relate to this cell switching method and device all in protection scope of the present invention.Although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (10)
1. a fast cell changing method for network assistance UE control, is characterized in that, comprise following step:
The first step: source base station obtains one or more candidate cell according to the Neighboring Cell List of configuration;
Second step: source base station respectively with the base station belonging to candidate cell alternately for UE prepares switchable resource, and to obtain corresponding candidate cell be switch the relevant information of the wave point for preparing;
3rd step: source base station organization network supplementary, comprises the information that the wave point of switching mode and switching judgment information, candidate cell mark and candidate cell is relevant, then connects reconfiguration message by RRC and configure to UE;
4th step: UE measures according to the switching mode of configuration, obtains corresponding measurement result; During switch decision, from configuration candidate cell preferably one as switching target small area, the Target cell of right backward selection is carried out synchronously, and reports switch indicating information;
5th step: perform switching and complete the stage, source base station, respectively to base station transmission handover cancelling message that is not selected but that switch belonging to the successful candidate cell of preparation, is released to switchable resource and the context of UE distribution.
2. method according to claim 1, is characterized in that, when described step 1 source base station obtains handover candidate cells, the formation that source base station obtains the adjacent area collection of configuration is:
The adjacent area quantity concentrated when adjacent area is greater than preset gate in limited time, according to geography information or/and translational speed information is or/and historical information concentrates preferred one or more adjacent area as handover candidate cells from adjacent area; The adjacent area quantity concentrated when adjacent area is not more than preset gate in limited time, and alternatively community, all adjacent areas is concentrated in adjacent area.
3. method according to claim 1, is characterized in that, prepares switchable resource and comprise in described 3rd step:
Source base station asks switching candidate target base station to be that UE prepares switchable resource by sending handover request message respectively; Candidate handover target base station is carried out call access control and is distributed switchable resource, then takes back the information that the evolved wireless access bearer E-RAB of receiving and wave point are correlated with to source base station by replying response message.
4. method according to claim 1, is characterized in that, switching mode described in the third step comprises based on measurement with based on geographical location information; If be configured to based on measurement, then switching judgment information carries measurement configuration information; If be configured to based on geographical location information, then switching judgment information carries the geographical location information (longitude and latitude) of handover candidate cells, and covering radius is with biased.
5. method according to claim 1, it is characterized in that, described in the 4th step, UE carries out switch decision, from the handover candidate cells that network-assist information carries preferably one as switching target small area, if switching mode is based on measurement, the treatment step of the preferred switching target small area of UE is:
501st step: UE measures the channel quality of adjacent cell, exporting measurement result, comprising the RSRP of adjacent cell or/and RSRQ, jumping to the 502nd step when satisfying condition;
502nd step: filter measurement result, obtains the measurement result of the candidate cell configured, jumps to the 503rd step;
503rd step: the measurement result of the candidate cell obtained after filtration is sorted according to RSRP or RSRQ, jumps to the 504th step;
504th step: the candidate cell selecting RSRP or RSRQ best is as switching target small area.
6. method according to claim 1, it is characterized in that, described in the 4th step, UE carries out switch decision, from the handover candidate cells that network-assist information carries preferably one as switching target small area, if switching mode is based on geographical location information, the treatment step of the preferred switching target small area of UE is:
501st step: UE according to certain period measurement geographical location information, and exports the geographical location information at current place, and wherein, UE configures the such as module such as global position system GPS or the Big Dipper can realize geography information measurement, jumps to the 502nd step;
The geographical location information of the handover candidate cells that the 502nd step: UE carries according to current geographical location information and network-assist information calculates the distance d of UE to handover candidate cells, jumps to the 503rd step;
503rd step: the difference of calculation plot covering radius r and distance d and biased offset, computing formula is: difference=coverage radius of cell r-(distance d+ is biased offset) jumps to the 504th step;
504th step: the handover candidate cells that filtering difference is less than 0, then sorts to handover candidate cells from big to small according to difference, and the handover candidate cells selecting difference maximum is as switching target small area.
7. method according to claim 1, is characterized in that, the process that described source base station switches waiting timer time-out comprises:
Described source base station and the base station belonging to candidate cell are carried out alternately, are released to the switchable resource that UE prepares;
Described source base station sends RRC to described UE and connects the network-assist information that reallocation message deletes configuration.
8. method according to claim 1, is characterized in that, described UE carries out measurement and switch decision process also comprises:
When described UE performs the switching based on measuring, judge the candidate cell whether measurement result that output meets measuring condition comprises network-assist information and carry, if not, described UE is to described source base station reporting measurement reports;
After described source base station receives measurement report, preferred handover-target base station; And carry out alternately with described target BS, for UE prepares switchable resource, and send switching command to described UE;
Described UE, after receiving switching command, carries out synchronously to described target BS; Described target BS and described source base station alternately, complete switching.
9. a device for fast cell switching, is characterized in that, comprise
Receiver module, receiving from the target BS belonging to candidate cell for described source base station is the switchable resource information that described UE prepares;
Knockdown block is described UE organization network supplementary for described source base station, and
Sending module, send configuration messages for described source base station to described UE, described configuration messages comprises network-assist information.
10. a device for fast cell switching, is characterized in that, also comprise
Receiver module, receive the configuration messages issued from described source base station for described UE, described configuration messages comprises network-assist information;
Measurement module, the switching mode of carrying according to network-assist information for described UE performs measurement;
Judging module, carries out switch decision for described UE according to measurement result, preferred switching target small area from the candidate cell that network-assist information carries, and
Synchronization module, the Target cell switched to preferred switching target small area or the instruction of described source base station for described UE is carried out synchronously.
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