CN108243463A - A kind of cell switching method of LTE high ferros - Google Patents
A kind of cell switching method of LTE high ferros Download PDFInfo
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- CN108243463A CN108243463A CN201611227331.4A CN201611227331A CN108243463A CN 108243463 A CN108243463 A CN 108243463A CN 201611227331 A CN201611227331 A CN 201611227331A CN 108243463 A CN108243463 A CN 108243463A
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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
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
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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
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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Abstract
The present invention discloses a kind of cell switching method of LTE high ferros, including：Source base station receives the measurement report that the UE on moving train is sent, and the measurement report includes：The velocity information of cell ID, the measurement result of neighboring community's receptivity, the location information of UE, UE where UE；Determined whether to meet trigger condition according to measurement report；If satisfied, then starting Target cell Channel Activation flow, and obtain the switching command that UE is switched on activated Target cell channel；After receiving the measurement report that UE is sent again, judge whether the measurement report of the last reception meets the trigger condition, if satisfied, switching command is sent UE, so that the UE is switched on activated Target cell channel；Wherein, the Target cell is to determine the to be switched cells of the UE according to the measurement result of neighboring community's receptivity.The above method shortens switching time, improves handover success rate.
Description
Technical field
The present invention relates to the communication technologys, and in particular to a kind of cell switching method of LTE high ferros.
Background technology
LTE is the mobile communication technology that 3GPP dominates formulation, TD-LTE can be matched by different uplink and downlink timeslots come
Meet multiple business demand, with the business experience being optimal and the best availability of frequency spectrum, therefore TD-LTE technologies are at a high speed
The optimal selection of Railway Mobile Radio.
From networking covering performance angle, high ferro LTE uses construction of professional network, using binary channels remote radio unit (RRU)
(RRU) technology carries out covering networking, and network data service rate is promoted, while be total to cell skill using more RRU using MIMO technology
Art, reduces handover between cells, promotes network performance, is suitable for along complicated high ferro, the scenes such as tunnel.LTE high ferros at present
The switching of private network includes measuring, judgement and performs three processes, and wherein judging process carries out in the eNodeB of cell-of-origin, at this section
Prolong and can be ignored.Handover delay is mainly generated by measuring and performing two steps.
It measures time delay and depends primarily on the measurement result processing delay that UE and eNodeB are measured, the data with required processing
It is related to measure size.Perform switching time delay again in two sub-sections：First, the time that activation Target cell resource needs；Second is that UE from
The time that Kaiyuan channel adjustment is needed to new channel.The time that switching performs depends primarily on the complexity and network of signaling process
Equipment is to the processing time of signaling.
For this purpose, existing handoff procedure, for the covering of LTE high ferros, handover delay is long, and it is low to be easy to cause downloading rate,
Handover failure often, goes offline the problems such as high.
Invention content
In view of the above problems, the present invention proposes the one kind for overcoming the above problem or solving the above problems at least partly
The cell switching method of LTE high ferros.
For this purpose, in a first aspect, the present invention proposes a kind of cell switching method of LTE high ferros, including：
Source base station receives the measurement report that the UE on moving train is sent, and the measurement report includes：It is small where UE
Area's mark, the velocity information of the measurement result of neighboring community's receptivity, the location information of UE, UE；
The source base station determines whether to meet trigger condition according to the measurement report；
If satisfied, then the source base station starts Target cell Channel Activation flow, and obtain the UE and switch to and activated
Target cell channel on switching command；
After the source base station receives the measurement report of UE transmissions again, judge whether the measurement report of the last reception is full
The foot trigger condition, if satisfied, the switching command is sent the UE, so that the UE is switched to activated Target cell
On channel；
Wherein, the Target cell is to determine that the UE is to be switched according to the measurement result of neighboring community's receptivity
Cell.
Optionally, the step of source base station determines whether to meet trigger condition according to the measurement report, including：
The source base station judges whether the velocity information of UE is more than pre-set velocity thresholding；
If so, mark of the source base station according to the Target cell, searches cutting when UE switches to the Target cell
Change reference point and switching type；
Source base station cell ID according to where the location information of the UE and the UE obtains UE and reaches switching reference
The time T of point；
Time T switching time thresholdings corresponding with switching type are compared；
If it is less than, it is determined that meet the trigger condition.
Optionally, according to the mark of the Target cell, search switching reference point when UE switches to the Target cell and
Switching type, including：
The source base station searches the switching reference point according to the Target Cell Identifier from preset neighboring cell list；
And
According to the mark of the source base station and the Target Cell Identifier, the switching type is determined；
Wherein, it is described to cut when the MME belonging to source base station mark and MME belonging to the Target Cell Identifier is identical
Type is changed as base station switching in MME；
When MME belonging to source base station mark and MME differences belonging to the Target Cell Identifier, the switching type
Base station switches between MME.
Optionally, source base station cell ID according to where the location information of the UE and the UE obtains UE and reaches
The step of switching the time T of reference point, including：
The time T is determined according to formula one；
Formula one：
Wherein, the coordinate for switching reference point is (An, Bn), and the location information of UE is (X, Y)；L is UE to switching reference point
Distance；S is the speed of UE.
Optionally, before the step of switching command being sent the UE, the method further includes：
The source base station checks whether the Target cell channel resource has activated；
If so, perform the step of switching command is sent into the UE.
Optionally, the step of UE switches to the switching command on activated Target cell channel is obtained, including：
When switching type is base station switching in MME, the source base station sends switching demand Handover to MME
Required；
The source base station receives the switching command for the switching demand that the MME is sent, and the switching command is the MME roots
According to what is sent after the switching demand and the Target cell alternate acknowledge.
Optionally, the step of UE switches to the switching command on activated Target cell channel is obtained, including：
When base station switches switching type between MME, the source base station sends switching demand Handover to source MME
Required；
The source base station receives the switching command for the switching demand that the source MME is sent, and the switching command is the source
MME is by sending after the target MME of Target cell and the Target cell alternate acknowledge.
Optionally, the method further includes：
The source base station sends eNB state transinformations to the MME, so that the MME is shifted according to the eNB states
Information sends MME state transinformations to Target cell；And
The source base station is to Target cell transmission data forwarding information data forwarding；
The source base station receives the UE context release commands that the MME is sent；The UE contexts release command is institute
It states MME and receives what the handoff notification message was sent later, the MME handoff notification messages is described in Target cell receptions
It sends after the completion of the RRC connection reconfigurations that UE is sent are put and to the MME；
The source base station discharges the context of the UE according to the UE contexts release command.
Optionally, the method further includes：
The source base station sends eNB state transinformations to source MME, so that source MME is according to the eNB states transinformation
PDCP state transinformations are sent to target MME；And
The source base station is to Target cell transmission data forwarding information data forwarding；
After the completion of the RRC connection reconfigurations that the source base station is sent in UE are put, the UE contexts that the source base station is sent are received
Release command；The UE contexts release command for source MME receive after the PDCP states transinformation by target MME with
Target cell interaction is sent to source MME；
The source base station discharges the context of the UE according to the UE contexts release command.
Second aspect, the present invention also provides a kind of cell switching method of LTE high ferros, including：
Base station belonging to UE to the UE on moving train sends measurement report, and the measurement report includes：UE institutes
Cell ID, the measurement result of neighboring community's receptivity, the location information of UE, UE velocity information；So that the base station
Start Target cell Channel Activation flow when determining that the UE meets trigger condition, and obtain to make according to the measurement report
UE switches to the switching command on activated Target cell channel,
After the UE sends measurement report to the base station again, receive the base station and determining the last measurement report
The switching command sent during sufficient trigger condition of declaring a full house, and interacted according to the switching command with Target cell, it switches to
On the Target cell channel of activation.
As shown from the above technical solution, the cell switching method of LTE high ferros proposed by the present invention, by measurement report
Increase the location information and velocity information of UE, and then realize and Target cell channel resource is completed before the cell handover trigger of UE
Activation, cut-out execution time delay during so as to reduce between LTE high ferro private networks eNB using S1 switchings shortens switching time, carries
High handover success rate provides higher reliability and validity for mobile communication system.
Description of the drawings
Figure 1A and Figure 1B is the flow diagram of the cell switching method of LTE high ferros that one embodiment of the invention provides；
Fig. 2 is the high ferro private network cell schematic diagram covered using individual layer；
Fig. 3 and Fig. 4 is respectively the signalling diagram of the cell switching method for the LTE high ferros that one embodiment of the invention provides；
Fig. 5 is the flow diagram of the cell switching method of LTE high ferros that another embodiment of the present invention provides；
Fig. 6 and Fig. 7 is respectively the structure diagram for the base station that one embodiment of the invention provides.
Specific embodiment
Purpose, technical scheme and advantage to make the embodiment of the present invention are clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical solution in the embodiment of the present invention is explicitly described, it is clear that described embodiment be the present invention
Part of the embodiment, instead of all the embodiments.
Switching is switched using S1 between LTE high ferros private network eNodeB in the embodiment of the present invention, the high ferro website switched using X2
Inapplicable this programme.This programme shortens handover delay and is also based on S1 switchings.
Open GPS switches in the embodiment of the present invention in UE sides first so that UE reports position and speed with measurement report
To network side.
Secondly, the measurement report reported when source eNodeB switches over UE is largely measured (comprising UE positions)
Statistics determines the switching method using the embodiment of the present invention or conventional switching flow of the prior art.
As shown in Figure 1A, Figure 1A shows the flow of the cell switching method for the LTE high ferros that one embodiment of the invention provides
Schematic diagram, the method for the present embodiment include the following steps
101st, source base station receives the measurement report that the UE on moving train is sent, and the measurement report includes：UE institutes
Cell ID, the measurement result of neighboring community's receptivity, the location information of UE, UE velocity information.
102nd, source base station determines whether to meet trigger condition according to the measurement report, if satisfied, step 103 is performed, it is no
Then, it is carried out according to normal changeover program in the prior art.
103rd, if satisfied, then the source base station starts Target cell Channel Activation flow, and obtains the UE and switch to
Switching command on the Target cell channel of activation.
Wherein, the Target cell is to determine that the UE is to be switched according to the measurement result of neighboring community's receptivity
Cell.
104th, after source base station receives the measurement report of UE transmissions again, judge whether the measurement report of the last reception is full
The foot trigger condition；
105th, if satisfied, the switching command is sent the UE by source base station, so that the UE is switched to activated target
On cell channel.
The cell switching method of the present embodiment, by increasing the location information and velocity information of UE in measurement report, into
And realize the activation that Target cell channel resource is completed before the cell handover trigger of UE, it is special so as to reduce LTE high ferros
Cut-out execution time delay when between net eNB using S1 switchings, shortens switching time, improves handover success rate, for mobile communication system
Higher reliability and validity are provided.
To be better understood from the present invention, Figure 1B shows the cell switching side for the LTE high ferros that one embodiment of the invention provides
The flow diagram of method, as shown in Figure 1B, the method for the present embodiment include the following steps.
101st, source base station receives the measurement report that the UE on moving train is sent, and the measurement report includes：UE institutes
Cell ID, the measurement result of neighboring community's receptivity, the location information of UE, UE velocity information.
In the present embodiment, UE can periodic reporting measurement reports, in the present embodiment during the interval of reporting measurement reports
Between can be 480ms.
1021st, source base station judges whether the velocity information of UE is more than pre-set velocity thresholding, if so, sub-step 1022 is performed,
Otherwise, conventional cell switching flow is performed.
That is, start the method for the embodiment of the present invention if train running speed is higher than this speed threshold, otherwise
It is carried out according to normal changeover program.
If the 1022, the velocity information of UE is more than pre-set velocity thresholding in step 1021, source base station is according to described adjacent small
The measurement result of area's receptivity determines the to be switched Target Cell Identifier of the UE.
1023rd, source base station searches switching reference point when UE switches to the Target cell according to the Target Cell Identifier
And switching type.
For example, the source base station in the step can be looked into according to the Target Cell Identifier from preset neighboring cell list
Look for the switching reference point；And the mark according to the source base station and the Target Cell Identifier, determine the switching type.
Wherein, when the MME and MME belonging to the Target Cell Identifier belonging to source base station mark is identical, the switching class
Type is base station switching in MME；
When MME belonging to source base station mark and MME differences belonging to the Target Cell Identifier, the switching type
Base station switches between MME.
It should be noted that the switching reference point in neighboring cell list is the coordinate points obtained based on big measurement statistical result,
The point is the multiple assembly average for measuring position when train triggering switches.
In practical applications, for switching the sustainable progress of statistics of reference point, the switching ginseng in preset neighboring cell list
Examination point can regularly update.
1024th, source base station cell ID according to where the location information of the UE and the UE obtains UE and reaches switching ginseng
The time T of examination point.
It will be appreciated that source eNodeB receives the periodic measurement report of UE every time, all estimate that a UE reaches switching ginseng
The time T of examination point.
In the present embodiment, source base station can determine the time T according to formula one；
Formula one：
Wherein, the coordinate for switching reference point is (An, Bn), and the location information of UE is (X, Y)；L is UE to switching reference point
Distance；S is the speed of UE.
1025th, time T switching time thresholdings corresponding with switching type are compared, if being less than, perform step
103, otherwise, perform conventional cell switching flow.
If the 103, being less than, the source base station starts Target cell Channel Activation flow, and net corresponding with switching type
Member interaction, obtains the switching command that the UE is switched on activated Target cell channel.
That is, UE drives to the time T (discreet value) of switching reference point locations less than switching type from current location
Corresponding switching time thresholding then starts the distribution activation of Target cell channel.Switching time thresholding in the present embodiment
Value it is related with handover event type.
104th, source base station receives the measurement report of UE transmissions again；Judge whether the measurement report of the last reception meets
The trigger condition if satisfied, performing following step 105, otherwise, cell switching is realized according to existing switching flow.
It should be noted that the judgement of trigger condition and the judgement of following sub-steps 1021 to sub-step 1025 in the step
Flow is consistent.
105th, if satisfied, the switching command is sent the UE by source base station, so that the UE is switched to activated target
On cell channel.
In practical applications, after the measurement report for receiving UE transmissions again in the source base station of step 104, step 105
Before the middle UE by switching command transmission, the above method may also include following step 104a being not shown in figure：
104a, source base station check whether the Target cell channel resource has activated；
If so, perform step 105；Otherwise, conventional cell switching flow is performed.
That is, source eNodeB will handle measurement report and carry out switch decision.If meeting switching condition, eNodeB
Also to confirm to whether Target cell channel resource has activated, if activation if eNodeB directly transmit switching command to
UE, it is desirable that UE is adjusted on the channel of Target cell, and in case of exception, Target cell channel not yet activates, then carries out routine
Changeover program.
The concept of switching reference point is proposed in the embodiment of the present invention, train is driven into switching reference point from current location
Time T then starts Target cell channel resource activation program compared with corresponding handoff threshold, less than handoff threshold, otherwise waits for
Next measurement report recalculates judgement.
The cell switching method of above-mentioned LTE high ferros, by increasing the location information and velocity information of UE in measurement report,
And then realize the activation that Target cell channel resource is completed before the cell handover trigger of UE, so as to reduce LTE high ferros
Cut-out execution time delay when between private network eNB using S1 switchings, shortens switching time, improves handover success rate, is mobile communication system
System provides higher reliability and validity.
To be better understood from present disclosure, may specify that as follows.
Assuming that LTE is covered using single net, i.e., the adjacent area of serving cell is only 2 front and rear, and specific implementation process includes：
1) application target cell specifies method, cell of the shielding in train operation rear, eNodeB by system message to
UE broadcast contains only unique adjacent cell PCI information, i.e. train operation ahead cell.
2) measurement report content is changed：In addition to related with unique adjacent cell comprising this cell in the measurement report reported in UE
Outside the measurement result of receptivity, also by the position comprising UE and velocity information.Location information includes cell CGI and position coordinates
(X,Y)；UE speed is S (m/s).
3) change eNodeB in cell list information, cell schematic diagram as shown in Fig. 2, modified cell list (i.e.
Corresponding above-mentioned preset neighboring cell list) it is as shown in table 1 below.
Table 1eNodeB cells/neighboring cell list
| CGI | Switch reference point | Affiliated MME |
| CGI(0) | - | MME(N-1) |
| CGI(1) | (X0, Y0), (X1, Y1) | MME(N) |
| CGI(2) | (X1, Y1), (X2, Y2) | MME(N) |
| … | … | … |
| CGI(n) | (Xn-1, Yn-1), (Xn, Yn) | MME(N) |
| CGI(n+1) | MME(N+1) |
In table 1, cell identification CGI is arranged by the sequence of positions of cell；Switch reference point locations coordinate, certain cell and
Front and rear 2 adjacent cells have 2 switching reference points；The affiliated MME of cell identification CGI indicate the ownership MME of certain cell.
In addition, switching class can be determined in above-mentioned steps 104 according to Target cell affiliated eNodeB and MME in table 1 and Fig. 2
Type switches between switching and MME between eNodeB.Switching needs to select different switching time thresholdings between switching and MME between eNodeB, such as
Shown in table 2
2 switching type table of table
| Switching type | Switching time thresholding | Threshold value |
| Switch between eNodeB in MME | time_threshold-A | 2*Time_save_E |
| Switch between eNodeB between MME | time_threshold-B | 2*Time_save_M |
Time_save_E and Time_save_M represents to switch the eNodeB between MME in MME between eNodeB respectively in table 2
Switching saved time, explanation in greater detail below.
The time T that UE is such as driven to switching reference point from current location is compared with corresponding handoff threshold, if small
In then starting Target cell channel activation procedure；Otherwise, then it waits for and recalculates judgement after receiving next measurement report.
As shown in figure 3, Fig. 3 shows that the signaling of the cell switching method for the LTE high ferros that one embodiment of the invention provides is shown
It is intended to, which switches corresponding schematic diagram for the eNodeB in same MME.The following institute of method of the present embodiment
It states.
301st, UE sends measurement report to source base station, and the measurement report includes：Cell ID, neighboring community connect where UE
Receive the measurement result of performance, the location information of UE, UE velocity information.
302nd, source base station judges whether to meet trigger condition according to measurement report, if satisfied, then starting Target cell channel
Activation process.
The step can be to judge whether to meet trigger condition for the first time, when meeting, be confirmed as a trigger point.In addition,
Trigger condition at this can correspond to the sub-step 1021 in above-mentioned Figure 1B to the process of sub-step 1025, should with reference to foregoing description
Place is no longer described in detail.
In addition, it is necessary to explanation, source base station is after measurement report is received, according to the processing stream after reception measurement report
Journey also continues to handle the measurement report.
303rd, when switching type is base station switching in MME, the source base station sends switching demand Handover to MME
Required；
304th, MME sends handover request according to the switching demand to Target cell；
305th, MME receives the Target cell and is responded according to the confirmation that handover request is replied.
306th, source base station receives the switching command for the switching demand that the MME is sent.
The switching command of the step can be the MME according to being sent out after the switching demand and the Target cell alternate acknowledge
It send.
307th, source base station stores the switching command.
308th, source base station receives the measurement report that UE is reported.
309th, source base station judges whether to meet trigger condition again according to the measurement report that the last time reports, if satisfied,
Switching command is then sent into the UE.
At this point, source base station judges whether to meet trigger condition on the basis of first time trigger point again, when meeting, really
Think secondary trigger point.In addition, the trigger condition at this can correspond to sub-step 1021 in above-mentioned Figure 1B to sub-step 1025
Process is no longer described in detail with reference to foregoing description, at this.
310th, after source base station sends switching command, eNB state transinformations are sent to the MME.
311st, MME sends MME state transinformations according to the eNB states transinformation to Target cell.
312nd, source base station is to Target cell transmission data forwarding information data forwarding.
313rd, the UE sends RRC connection reconfigurations to Target cell according to switching command and puts completion.
314th, MME receives the Target cell and puts completion, MME states according to data forwarding, RRC connection reconfigurations
The switching notice response that transinformation is sent；
315th, MME is responded to source base station according to the switching notice and is sent UE context release commands.
That is, source base station receives the UE context release commands that the MME is sent；The UE contexts release command
Receive what the handoff notification message was sent later for the MME, the MME handoff notification messages are that the Target cell receives
It sends after the completion of the RRC connection reconfigurations that the UE is sent are put and to the MME.
316th, source base station discharges the context of the UE according to the UE contexts release command.
Switch accordingly, between the eNodeB in MME, meeting the 1st triggering, (Target cell channel resource swashs in advance
It is living) condition opisthogenesis eNodeB is to target eNodeB transmission Channel Activation orders, in the 2nd triggering (performing switching) condition of satisfaction
Afterwards, switching command is sent to UE immediately, order UE is adjusted on activated Target cell channel.
As shown in figure 4, Fig. 4 shows that the signaling of the cell switching method for the LTE high ferros that one embodiment of the invention provides is shown
It is intended to, eNodeB of the signaling shown in Fig. 4 between different MME switches corresponding schematic diagram.The following institute of method of the present embodiment
It states.
401st, UE sends measurement report to source base station, and the measurement report includes：Cell ID, neighboring community connect where UE
Receive the measurement result of performance, the location information of UE, UE velocity information.
402nd, source base station judges whether to meet first time trigger condition according to measurement report, if satisfied, it is small then to start target
Area's Channel Activation flow.
The step can be to judge whether to meet trigger condition for the first time, when meeting, be confirmed as a trigger point.In addition,
Trigger condition at this can correspond to the sub-step 1021 in above-mentioned Figure 1B to the process of sub-step 1025, should with reference to foregoing description
Place is no longer described in detail.
403rd, when base station switches switching type between MME, the source base station sends switching demand Handover to source MME
Required；
404th, source MME sends forward relocation request according to switching demand to target MME.
405th, target MME sends handover request according to forward relocation request to Target cell.
406th, target MME receives the Target cell and is responded according to the confirmation that handover request is replied.
407th, source MME receives target MME according to the sound of forward relocation request for confirming that response is sent
Answer (i.e. forward relocation response)
408th, source base station receives the switching command for the switching demand that source MME is sent.
The switching command of the step can be that the source MME is interacted by the target MME of Target cell with the Target cell
It is sent after response.
409th, source base station stores the switching command.
410th, source base station receives the measurement report that UE is reported again.
411st, source base station judges whether to meet trigger condition according to the measurement report that the last time reports.
At this point, source base station judges whether to meet trigger condition on the basis of first time trigger point again, when meeting, really
Think secondary trigger point.In addition, the trigger condition at this can correspond to sub-step 1021 in above-mentioned Figure 1B to sub-step 1025
Process is no longer described in detail with reference to foregoing description, at this.
412nd, if satisfied, switching command then is sent the UE.
413rd, after source base station sends switching command, eNB states transinformation (eNB status are sent to the MME
transter)。
414th, source MME sends PDCP state transinformations according to the eNB states transinformation to target MME.
415th, target MME sends target MME status transter according to PDCP states transinformation to Target cell
(MME states transinformation).
416th, source base station is to Target cell transmission data forwarding information data forwarding.
417th, UE sends RRC connection reconfigurations to Target cell according to switching command and puts completion.
418th, target MME receives the Target cell and puts completion, target according to data forwarding, RRC connection reconfigurations
The switching notice response that MME states transinformation is sent；
419th, target MME is responded to source base station according to the switching notice and is sent forward relocation
complete.
420th, source base station sends forward relocation complete ACK to target MME.
421st, after tracking area update procedure (partly), source base station receives source MME and sends
UE context release commands.
That is, the UE contexts release command passes through after receiving the PDCP states transinformation for source MME
What target MME was sent with Target cell interaction to source MME.
422nd, source base station discharges the context of the UE according to the UE contexts release command.
Switch between the eNodeB in MME as a result, the total time for switching execution is sent from source eNodeB to MME
HANDOVER REQUIRED message receives the RRC Connection Reconfiguration of UE transmissions to target eNodeB
Time interval between Complete message, is defined as Time_total_N.The quickening of handover process is mainly due to source eNodeB
It would have been completed the activation of Target cell channel before sending switching command to UE, it is from source eNodeB to MME to save the time
HANDOVER REQUIRED are sent to the time interval received between HANDOVER COMMAND, are defined as Time_save.
Further, switch between MME, the total time for switching execution is transmission HANDOVER from source eNodeB to source MME
The RRC Connection Reconfiguration Complete that REQUIRED message receives UE transmissions to target eNodeB disappear
Time interval between breath, is defined as Time_total_M.The time of saving is transmission HANDOVER from source eNodeB to source MME
REQUIRED message is defined as Time_save to the time interval received between source MME transmission HANDOVER COMMAND.
It illustrating, switching is similar with switching between eNodeB in MME shown in Fig. 3 between above-mentioned MME shown in Fig. 4,
Difference lies in the differences of switching time thresholding, and more due to switching the equipment being related between MME, signaling is more complicated, the time needed
Also it is longer than the former, it is become apparent using this algorithm effect.
Fig. 5 shows the signalling diagram of the cell switching method for the LTE high ferros that one embodiment of the invention provides, this implementation
The method of example is as described below.
501st, the base station belonging to the UE on moving train to the UE sends measurement report, and the measurement report includes：
The velocity information of cell ID, the measurement result of neighboring community's receptivity, the location information of UE, UE where UE；It is so that described
Base station starts Target cell Channel Activation flow when determining that the UE meets trigger condition, and is obtained and used according to the measurement report
In the switching command that UE is made to switch on activated Target cell channel,
502nd, UE sends measurement report to the base station again.
503rd, it is cut described in being sent when measurement report of the UE receptions base station in determining the last time meets trigger condition
Order is changed, and is interacted according to the switching command with Target cell, is switched on activated Target cell channel.
LTE high ferro private network coverage modes in the present embodiment frequently occur, switching due to switching in train travelling process
Can have a great impact to the service quality of system, therefore the factor for influencing handover delay is analyzed, shorten switching and hold
Row time delay, especially when MME switches effect become apparent from, can preferably be suitable for high velocity environment, by shortening switching time, from
And handover success rate is improved, provide higher reliability and validity for mobile communication system.
The embodiment of the present invention compensates for the technological deficiency that existing LTE switching flows are applied to high ferro private network, from actual demand
It sets out, the distribution and activation of Target cell channel resource is first completed using the Timing Advance based on switching reference point, further according to
Measurement report switches over judgement, and order mobile station is adjusted on new channel, shortens handover delay, promotes user and perceives.
Fig. 6 shows the structure diagram for the base station that one embodiment of the invention provides, as shown in fig. 6, the base of the present embodiment
Station includes：Receiving unit 61, determination unit 62, switching command acquiring unit 63 and transmitting element 64；
Wherein, the measurement report that receiving unit 61 sends for UE of the reception on moving train, the measurement report
Including：The velocity information of cell ID, the measurement result of neighboring community's receptivity, the location information of UE, UE where UE；
Determination unit 62 is used to determine whether to meet trigger condition according to the measurement report；
Switching command acquiring unit 63 is used for when determination unit 62 determines to meet trigger condition, starts Target cell channel
Activation process, and obtain the switching command that the UE is switched on activated Target cell channel；
After the receiving unit 61 receives the measurement report of UE transmissions again, determination unit 62 is used to judge that the last time connects
Whether the measurement report of receipts meets the trigger condition, if satisfied, transmitting element 64 for will the switching command send described in
UE, so that the UE is switched on activated Target cell channel；
Wherein, the Target cell is to determine that the UE is to be switched according to the measurement result of neighboring community's receptivity
Cell.
The base station of the present embodiment can be the source base station in above method embodiment, implement for performing above-mentioned any means
The content of example is no longer described in detail referring to foregoing description, at this.
In addition, Fig. 7 shows the structure diagram for the base station that one embodiment of the invention provides, as shown in fig. 7, the present embodiment
Base station include：Processor (processor) 71, memory (memory) 72, communication interface (Communications
Interface) 73 and bus 74；
Wherein, the processor 71, memory 72, communication interface 73 complete mutual communication by the bus 74；
The communication interface 73 is used to implement the information transmission between the base station and other communication equipments；
The processor 71 is used to call the program instruction in the memory 72, to perform above-mentioned each method embodiment institute
The method of offer, such as including：Source base station receives the measurement report that the UE on moving train is sent, the measurement report packet
It includes：The velocity information of cell ID, the measurement result of neighboring community's receptivity, the location information of UE, UE where UE；
The source base station determines whether to meet trigger condition according to the measurement report；
If satisfied, then the source base station starts Target cell Channel Activation flow, and obtain the UE and switch to and activated
Target cell channel on switching command；
After the source base station receives the measurement report of UE transmissions again, judge whether the measurement report of the last reception is full
The foot trigger condition, if satisfied, the switching command is sent the UE, so that the UE is switched to activated Target cell
On channel；
Wherein, the Target cell is to determine that the UE is to be switched according to the measurement result of neighboring community's receptivity
Cell.
The scheme of the base station of the present embodiment and UE interactions can compensate for the skill that existing LTE switching flows are applied to high ferro private network
From actual demand, Target cell channel resource is first completed using the Timing Advance based on switching reference point for art defect
Distribution and activation, judgement is switched over further according to measurement report, and order mobile station is adjusted on new channel, shortens handover delay,
User is promoted to perceive.
It will be appreciated by those of skill in the art that although some embodiments described herein include being wrapped in other embodiments
The certain features rather than other feature included, but the combination of the feature of different embodiment mean in the scope of the present invention it
It is interior and form different embodiments.
It will be understood by those skilled in the art that each step in embodiment can with hardware realization or at one or
The software module run on the multiple processors of person is realized or is realized with combination thereof.Those skilled in the art should manage
Solution, can realize according to embodiments of the present invention one using microprocessor or digital signal processor (DSP) in practice
The some or all functions of a little or whole components.The present invention is also implemented as performing method as described herein
Some or all equipment or program of device (for example, computer program and computer program product).
Although being described in conjunction with the accompanying embodiments of the present invention, those skilled in the art can not depart from this hair
Various modifications and variations are made in the case of bright spirit and scope, such modifications and variations are each fallen within by appended claims
Within limited range.
Claims (10)
1. a kind of cell switching method of LTE high ferros, which is characterized in that including：
Source base station receives the measurement report that the UE on moving train is sent, and the measurement report includes：Cell mark where UE
Knowledge, the velocity information of the measurement result of neighboring community's receptivity, the location information of UE, UE；
The source base station determines whether to meet trigger condition according to the measurement report；
If satisfied, then the source base station starts Target cell Channel Activation flow, and obtain the UE and switch to activated mesh
Mark the switching command on cell channel；
After the source base station receives the measurement report of UE transmissions again, judge whether the measurement report of the last reception meets institute
Trigger condition is stated, if satisfied, the switching command is sent the UE, so that the UE is switched to activated Target cell channel
On；
Wherein, the Target cell is to determine to be switched small of the UE according to the measurement result of neighboring community's receptivity
Area.
2. according to the method described in claim 1, it is characterized in that, the source base station determines whether completely according to the measurement report
The step of sufficient trigger condition, including：
The source base station judges whether the velocity information of UE is more than pre-set velocity thresholding；
If so, mark of the source base station according to the Target cell, searches switching ginseng when UE switches to the Target cell
Examination point and switching type；
Source base station cell ID according to where the location information of the UE and the UE obtains UE and reaches switching reference point
Time T；
Time T switching time thresholdings corresponding with switching type are compared；
If it is less than, it is determined that meet the trigger condition.
3. according to the method described in claim 2, it is characterized in that, according to the mark of the Target cell, search UE and switch to
Switching reference point and switching type during the Target cell, including：
The source base station searches the switching reference point according to the Target Cell Identifier from preset neighboring cell list；And
According to the mark of the source base station and the Target Cell Identifier, the switching type is determined；
Wherein, when the MME belonging to source base station mark and MME belonging to the Target Cell Identifier is identical, the switching class
Type is base station switching in MME；
When MME belonging to source base station mark and MME differences belonging to the Target Cell Identifier, the switching type is
Base station switches between MME.
4. according to the method described in claim 2, it is characterized in that, the source base station is according to the location information of the UE and described
Cell ID where UE obtains the step of UE reaches the time T of switching reference point, including：
The time T is determined according to formula one；
Formula one：
Wherein, the coordinate for switching reference point is (An, Bn), and the location information of UE is (X, Y)；L be UE to switch reference point away from
From；S is the speed of UE.
5. according to the method described in claim 1, it is characterized in that, by the switching command send the UE the step of before,
The method further includes：
The source base station checks whether the Target cell channel resource has activated；
If so, perform the step of switching command is sent into the UE.
6. according to the method described in claim 1, it is characterized in that, obtaining the UE switches to activated Target cell channel
On switching command the step of, including：
When switching type is base station switching in MME, the source base station sends switching demand Handover Required to MME；
The source base station receives the switching command for the switching demand that the MME is sent, and the switching command is the MME according to institute
State what is sent after switching demand and the Target cell alternate acknowledge.
7. according to the method described in claim 1, it is characterized in that, obtaining the UE switches to activated Target cell channel
On switching command the step of, including：
When base station switches switching type between MME, the source base station sends switching demand Handover to source MME
Required；
The source base station receives the switching command for the switching demand that the source MME is sent, and the switching command leads to for the source MME
Cross after the target MME of Target cell and the Target cell alternate acknowledge what is sent.
8. according to the method described in claim 6, it is characterized in that, the method further includes：
The source base station sends eNB state transinformations to the MME, so that the MME is according to the eNB states transinformation
MME state transinformations are sent to Target cell；And
The source base station is to Target cell transmission data forwarding information data forwarding；
The source base station receives the UE context release commands that the MME is sent；The UE contexts release command is the MME
Receive what the handoff notification message was sent later, the MME handoff notification messages receive the UE hairs for the Target cell
It is sent after the completion of the RRC connection reconfigurations sent are put and to the MME；
The source base station discharges the context of the UE according to the UE contexts release command.
9. the method according to the description of claim 7 is characterized in that the method further includes：
The source base station sends eNB state transinformations to source MME so that source MME according to the eNB states transinformation to mesh
It marks MME and sends PDCP state transinformations；And
The source base station is to Target cell transmission data forwarding information data forwarding；
After the completion of the RRC connection reconfigurations that the source base station is sent in UE are put, the UE contexts release that the source base station is sent is received
Order；The UE contexts release command passes through target MME and target after receiving the PDCP states transinformation for source MME
Cell interaction is sent to source MME；
The source base station discharges the context of the UE according to the UE contexts release command.
10. a kind of cell switching method of LTE high ferros, which is characterized in that including：
Base station belonging to UE to the UE on moving train sends measurement report, and the measurement report includes：It is small where UE
Area's mark, the velocity information of the measurement result of neighboring community's receptivity, the location information of UE, UE；So that the base station is true
The fixed UE starts Target cell Channel Activation flow when meeting trigger condition, and is obtained according to the measurement report to cut UE
The switching command on activated Target cell channel is shifted to,
After the UE sends measurement report to the base station again, receive the base station expires in the measurement report for determining the last time
The switching command sent during sufficient trigger condition, and interacted according to the switching command with Target cell, it switches to and has activated
Target cell channel on.
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| CN112312501A (en) * | 2020-11-06 | 2021-02-02 | 中国联合网络通信集团有限公司 | Method for determining access network equipment and terminal |
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| CN111836313B (en) * | 2019-04-17 | 2022-08-09 | 华为技术有限公司 | Indication method for cell switching measurement, network equipment and terminal |
| CN114727345A (en) * | 2019-06-14 | 2022-07-08 | 小米通讯技术有限公司 | Aggregation connection establishment method, device and storage medium |
| CN112449380A (en) * | 2019-08-28 | 2021-03-05 | 深圳市优克联新技术有限公司 | Method, device, base station and storage medium for switching control |
| CN112449303A (en) * | 2019-08-30 | 2021-03-05 | 华为技术有限公司 | Communication method and related equipment |
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| CN111935806A (en) * | 2020-08-10 | 2020-11-13 | 河北电信设计咨询有限公司 | Road coverage base station operation method based on service perception |
| CN111935806B (en) * | 2020-08-10 | 2024-04-30 | 河北电信设计咨询有限公司 | Road coverage base station operation method based on service perception |
| CN112312501A (en) * | 2020-11-06 | 2021-02-02 | 中国联合网络通信集团有限公司 | Method for determining access network equipment and terminal |
| WO2023241510A1 (en) * | 2022-06-16 | 2023-12-21 | 华为技术有限公司 | Cell handover method and communication device |
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