CN109462873A - A kind of optimization method of communication-based train control system pingpang handoff - Google Patents
A kind of optimization method of communication-based train control system pingpang handoff Download PDFInfo
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- CN109462873A CN109462873A CN201811358959.7A CN201811358959A CN109462873A CN 109462873 A CN109462873 A CN 109462873A CN 201811358959 A CN201811358959 A CN 201811358959A CN 109462873 A CN109462873 A CN 109462873A
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/165—Performing reselection for specific purposes for reducing network power consumption
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Abstract
The invention discloses a kind of optimization methods of communication-based train control system pingpang handoff.The present invention accesses first community own base station in mobile terminal, establishes mapping relations by establishing mapping relations for identifying mobile terminal according to information of mobile terminal；Second community own base station is switched to from first community own base station, mapping relations are established for identifying mobile terminal according to information of mobile terminal, two base stations store this handover information respectively；Starting switching historical information validity verifies cycle timer, verifies result by validity and handles handover information；After mobile terminal is cut into second community own base station by first community own base station, punish that timer and second community own base station handover information carry out anti-pingpang handoff processing according to anti-pingpang handoff；After mobile terminal is by second community own base station switchback first community own base station, punish that timer and first community own base station handover information carry out anti-pingpang handoff processing according to anti-pingpang handoff.
Description
Technical field
The invention belongs to wireless communication technology field more particularly to a kind of communication-based train control system pingpang handoffs
Optimization method.
Background technique
Conventional communication-based train control (Communication Based Train Control System, CBTC)
System is realized based on WiFi technology, the characteristics of due to WiFi technology and without proprietary radio resource, with the more people
With shared radio resource is wirelessly communicated, biggish interference is often resulted in.CBTC system needs to wirelessly communicate guarantor due to its particularity
Hinder higher singal reporting code and reliability, if these requirements are based on WLAN technology and would become hard to reach, and also repeatedly occurs normal
Rule CBTC system leads to the accidents such as withdrawal of train due to signal interference etc..
For the above reason, the new CBTC system based on LTE technology is just come into being.New CBTC system used for the 4th generation
Wireless communication technique can reach higher performance indicator and reliability, so that CBTC system has higher safety
And reliability, for train operation with regard to relatively reliable.
Pingpang handoff refers to that train control system TAU (Train Access Unit) comes between serving cell and adjacent area
The phenomenon that switchback is changed.It is frequent since handoff procedure will lead to certain system performance decline (data delay, packet loss)
Pingpang handoff can make the wireless performance of LTE network decline, and CBTC system has higher requirement to time delay and packet loss, therefore
CBTC system based on LTE network is also due to wireless network performance decline causes the security and reliability of CBTC system to decline.
Pingpang handoff in order to prevent, conventional way are that setting switch penalty timer (or is called the timing of anti-pingpang handoff
Device), timer, which has not timed out, does not allow terminal to switch, i.e., terminal from first community be switched to second community after opening timing device, if
Terminal is want after switching back into the switch penalty timer expiry that first community can only wait until second community own base station from second community
Just allow to switch.If terminal is switched to second community from first community again, Normal practice is also intended to until first is small
Just allow after the switch penalty timing time-out of area's own base station.Because train belongs to unidirectional operation, if the terminal train on train
Control system mobile terminal needs second when being switched to second community from first community, needs etc. according to Normal practice to be switched
Punish that timer expiry, train control system mobile terminal cannot switch in time, this easilys lead to Radio Link Failure, this is right
It requires for very high CBTC system to be extremely serious influence in reliability and stability.So the table tennis under CBTC system
Switching optimization method is particularly important.
Summary of the invention
For it is conventional prevent train control system mobile terminal caused by the way of pingpang handoff cannot switch in time from
And the problem of Radio Link Failure of generation, propose a kind of optimization side of communication-based train control system pingpang handoff
Method, the technical scheme adopted by the invention is as follows:
Step 1: train control system mobile terminal accesses first community own base station, and first community own base station obtains column
The vehicle control mobile terminal first information, the second information of train control system mobile terminal or train control system mobile terminal
Third information, state, train control system of the first community own base station according to the train control system mobile terminal first information
The state of the second information of mobile terminal and the state of train control system mobile terminal third information are sent out to key control node
Send query messages, the first information, second letter of the first community own base station according to the train control system mobile terminal inquired
Breath, third information establish mapping relations, for marking the train control system mobile terminal in inside of base station；
Step 2: train control system mobile terminal leaves from first community own base station wireless signal coverage area, enters
Second community own base station wireless signal coverage area, second community own base station is also for the train control system mobile terminal
The first information, the second information, third information establish mapping relations, mark the train control system mobile eventually for inside of base station
End.And for this switching, first community own base station is to second community own base station respectively by the related letter of this switching
Breath is stored in the information memory cell of respective inside of base station；
Step 3: electricity operation on first community own base station and second community own base station, synchronous averaging first community institute
Belong to base station and second community own base station switching historical information validity verifies regular device, is stored if timer expiry
The validity of information is verified；
Step 4: after train control system mobile terminal is cut into second community own base station by first community own base station,
Second community own base station starts its anti-pingpang handoff punishment timer, and carries out anti-pingpang handoff processing；
Step 5: after train control system mobile terminal is by second community own base station switchback first community own base station, the
One cell own base station starts its anti-pingpang handoff punishment timer, and carries out anti-pingpang handoff processing.
Preferably, the first information of train control system mobile terminal described in step 1 is M1, the train control system
The second information of mobile terminal is M2, and the train control system mobile terminal third information is M3；
The first information state of train control system mobile terminal described in step 1 is W1If M1Information is present in first community
Then W1=1 and by M1As the mobile terminal first information of first community train control system described in step 1 D1,1, otherwise W1=0；
Second information state of train control system mobile terminal described in step 1 is W2If M2Information is present in first community
Then W2=1 and by M2As the second information of mobile terminal of first community train control system described in step 1 D1,2, otherwise W2=0；
The third information state of train control system mobile terminal described in step 1 is W3If M3Information is present in first community
Then W3=1 and by M3As the mobile terminal third information of first community train control system described in step 1 D1,3, otherwise W3=0；
Query messages are sent to key control node described in step 1 are as follows:
If W1=1, W2=1, W3=1 first community own base station does not need to send query messages to key control node,
Directly by D1,1, D1,2, D1,3According to 3GPP protocol construction D1,1, D1,2, D1,3Mapping relations, and pass through { D1,1, D1,2, D1,3Use
To identify train control system mobile terminal；
If WiIt is not all 1, then first community own base station sends query messages to key control node, takes in query messages
Band WiI-th information of the mobile terminal of=1 (i ∈ [1,3]), key control node is according to the i-th information in query messages, together
By the first information M of mobile terminal1, the second information M2, third information M3It is sent to first community own base station, base station receives pass
By W after the message that key control node is sentiIt is set to 1, and by M1、M2And M3It is stored in inside of base station and labeled as D1,1, D1,2,
D1,3According to 3GPP protocol construction D1,1, D1,2, D1,3Mapping relations, and pass through { D1,1, D1,2, D1,3Be used to identify Train Control
System and mobile terminal.
Preferably, train control can be carried in the switching request message that first community own base station described in step 2 is sent
The third information M of system and mobile terminal processed3, second community own base station is by M3Information is stored in inside of base station and labeled as D2,3。
Second community own base station is according to train control system mobile terminal third information D2,3, sent out to key control node
Send train control system mobile terminal enquiry message, key control node is by the first message of the train control system mobile terminal
M1, second message M2, third message M3It is sent to second community own base station together.；
Second community own base station receives the first message M of the terminal after the message that key control node is sent1, second
Message M2It is stored in inside of base station and labeled as D2,1, D2,2, according to 3GPP protocol construction D2,1, D2,2, D2,3Mapping relations, and
Pass through { D2,1, D2,2, D2,3Be used to identify train control system mobile terminal；
There are two information storage is single respectively for first community own base station described in step 2 and second community own base station
Member: terminal cuts out information memory cell and terminal incision information memory cell.Its storage of information memory cell is cut out for terminal
Content be that the first, second and third information, switching purpose cell ID and the terminal of terminal from this cell cuts out the time.And terminal is cut
Enter the first, second and third information that its storage content of information memory cell is terminal, source cell mark and terminal are cut into this cell
Time.
When terminal is switched to second community from first community, first community is the source cell of this switching, and second is small
Area is the purpose cell of this switching.First community own base station is by the first, second and third information { D of the terminal1,1, D1,2,
D1,3, second community mark successfully leaves the time T of first community with terminal1,outIt is stored in the terminal of first community own base station
It cuts out in information memory cell.If there is a situation where be repeatedly switched to second community, first community institute from first community for terminal
Belong to base station terminal cut out can be stored in information memory cell a plurality of terminal the first, second and third information it is identical, switching purpose cell
It is identified as second community but cuts out time T1,outDifferent information.
Corresponding, second community own base station is by the first, second and third information { D of the terminal2,1, D2,2, D2,3, first community
Mark and terminal successfully cut the time T of second community2,inIt is stored in the terminal incision information storage of second community own base station
In unit.If there is a situation where be repeatedly switched to second community, the terminal of second community own base station from first community for terminal
Incision information memory cell in can store a plurality of terminal the first, second and third information it is identical, switching source cell be identified as first community
But cut-in timing T2,inDifferent information.
Similarly, if there is a situation where be repeatedly switched to first community, second community own base station from second community for terminal
Terminal cut out can be stored in information memory cell a plurality of terminal the first, second and third information it is identical, switching purpose cell ID be
First community still cuts out time T2,outDifferent information.In the terminal incision information memory cell of first community own base station
The first, second and third information that can store a plurality of terminal is identical, switching source cell is identified as second community but cut-in timing T1,inNo
Same information.
Preferably, the timer of the switching historical information cycle timer of first community own base station described in step 3 is long
Degree is tcheck, the power-on time of first community own base station is T1；
The timer length that second community own base station described in step 3 switches historical information cycle timer is t'check,
The power-on time of second community own base station is T2；
The validity that information is stored described in step 3 is verified are as follows:
When the secondary time-out of first community own base station switching historical information cycle timer jth (j=1,2,3,4 ...),
The current time is T1+j*tcheck, the terminal of the first community own base station in first community own base station checking step 2 cuts out
The each information stored in information memory cell and terminal incision information memory cell.Specifically: information is cut out for terminal
Every information in storage unit, the T that will be recorded in every information1,outWith current time T1+j*tcheckIt makes comparisons, if T1+j*
tcheck-T1,out>tcheck, then this information deletion, otherwise remains in terminal and cuts out in information memory cell.For terminal
Cut every information in information memory cell, the T that will be recorded in every information1,inWith current time T1+j*tcheckIt makes comparisons,
If T1+j*tcheck-T1,in>tcheck, then this information deletion, otherwise remains in terminal incision information memory cell.
In CBTC system, tcheckValue can be matched according to the speed of service of train, arrangement of base stations situation etc. in system
Set, guarantee terminal cut out be not in information memory cell two and the above terminal the first, second and third information it is identical, cut
Purpose cell ID is changed to be second community but cut out time T1,outDifferent information, while guaranteeing to cut information storage in terminal
Be not in unit two and the above terminal the first, second and third information is identical, switching source cell is identified as second community still
Cut-in timing T1,inDifferent information.
Similarly, when second community own base station switching historical information cycle timer kth (k=1,2,3,4 ...) is secondary super
Constantly, the current time is T2+k*t'check, the end of the second community own base station in second community own base station checking step 2
End cuts out each information stored in information memory cell and terminal incision information memory cell.Specifically: terminal is cut
Every information in information memory cell out, the T that will be recorded in every information2,outWith current time T2+k*t'checkIt makes comparisons,
If T2+k*t'check-T2,out>t'check, then this information deletion, otherwise remains in terminal and cuts out in information memory cell.
For every information in terminal incision information memory cell, the T that will be recorded in every information2,inWith current time T2+k*
tcheckIt makes comparisons, if T2+k*t'check-T2,in>t'check, then this information deletion, otherwise remains in terminal incision information
In storage unit.
t'checkValue also to be configured according to the speed of service of train, arrangement of base stations situation etc. in CBTC system, guarantee
Terminal cut out be not in information memory cell two and the above terminal the first, second and third information it is identical, switching purpose it is small
Area is identified as first community but cuts out time T2,outDifferent information, while guaranteeing to cut in information memory cell not in terminal
First, second and third information of appearance two and the above terminal is identical, switching source cell is identified as first community but cut-in timing
T2,inDifferent information.
Preferably, second community own base station described in step 4 starts the length of its anti-pingpang handoff punishment timer
For tpunish；
Anti- pingpang handoff processing is carried out described in step 4 are as follows:
Mobile terminal access at this time is in second community, if request is switched to first community from second community, second is small at this time
Area's own base station starts anti-pingpang handoff and punishes timer, timer length tpunish.Sync check second community own base station
Terminal cut out information memory cell and terminal incision information memory cell, be not present if being cut out in information memory cell in terminal
First, second and third information is identical as the mobile terminal and switches purpose cell ID as the information of first community, or cuts in terminal
Enter identical with the mobile terminal there is no the first, second and third information in information memory cell and switches source cell to be identified as first small
The information in area, then second community own base station can be until the duration t of anti-pingpang handoff punishment timerpunishJust allow to move afterwards
Terminal is switched to first community from second community.
If the terminal of second community own base station is cut out in information memory cell, there are first, second and third information and this
Mobile terminal is identical and switches the information that purpose cell ID is first community, and deposits in terminal incision information memory cell
It is identical as the mobile terminal in first, second and third information and switch source cell and be identified as the information of first community, then second
Cell own base station directly allows mobile terminal to be switched to first community from second community.
Preferably, first community own base station described in step 5 starts the length of its anti-pingpang handoff punishment timer
For t'punish；
Anti- pingpang handoff processing is carried out described in step 5 are as follows:
Mobile terminal access at this time is in first community, if request is switched to second community from first community, first is small at this time
Area's own base station starts anti-pingpang handoff and punishes timer, timer length t'punish.The affiliated base of sync check first community
The terminal stood cuts out information memory cell and terminal incision information memory cell, does not deposit if cutting out in information memory cell in terminal
And switching purpose cell ID identical as the mobile terminal in the first, second and third information is the information of second community, or in terminal
And switching source cell identical as the mobile terminal there is no the first, second and third information is identified as second in incision information memory cell
The information of cell, then first community own base station can be until the duration t' of anti-pingpang handoff punishment timerpunishJust allow to move afterwards
Dynamic terminal is switched to second community from first community.
If the terminal of first community own base station is cut out in information memory cell, there are first, second and third information and this
Mobile terminal is identical and switches the information that purpose cell ID is second community, and deposits in terminal incision information memory cell
It is identical as the mobile terminal in first, second and third information and switch source cell and be identified as the information of second community, then first
Cell own base station directly allows mobile terminal to be switched to second community from first community.
Advantage possessed by invention compared with the existing technology, feature or good effect:
The relevant information of TAU that base station side saves all accesses or once accessed, and by IMSI, S-TMSI and MME-
UE-S1AP-ID forms mapping relations, it is known that any one in three information can inquire other two information of the TAU.
Because IMSI information is fixed and invariable for terminal, and what when terminal switches carried is MME-UE-S1AP-ID information,
Base station side all stores these three information of IMSI, S-TMSI and MME-UE-S1AP-ID, and record that can be more accurate should
The relevant history handover information of terminal, information is obscured when multiple terminals being avoided to switch.
In the handover request of the TAU of base station record, the source cell preserved in TAU handoff procedure is related to purpose cell
Information, and current time when switching are conducive to the judgement for carrying out pingpang handoff, and the record at time point enhances
Timeliness.
The introducing switching historical information validity of innovation verifies regular device, ensure that the timeliness of record, timer expiry
Record time older handover information is cleared up afterwards, avoids exceeding the time limit to record the judgement of informational influence pingpang handoff state, simultaneously
The loss to base station memory can be reduced.
In the judgement of pingpang handoff, because of the source cell for thering is terminal TA U to switch every time and purpose cell-related information
Record, anti-pingpang handoff process can be optimized, i.e., if it is within a certain period of time, which is to cut from some cell for second
When changing to another cell, just without waiting for switch penalty timer expiry, directly allows to switch, TAU is quickly returned
Onto correctly This train is bound for XXX cell, prevents Radio Link Failure and CBTC system bring is seriously affected.If sentenced
Breaking as the terminal is when being switched to another cell from some cell for the first time, still switch penalty timer expiry to be waited just to permit
Perhaps switch, reduce the number of pingpang handoff.
The present invention avoids CBTC system due to traditional pingpang handoff punishment timing by this optimizing ping-pong switching method
Device designs and bring Radio Link Failure risk, promotes the safety and reliability of CBTC system.
Detailed description of the invention
Fig. 1: identification information flow chart of the base station of the present invention to key control node inquiry train control system mobile terminal；
Fig. 2: UE IDENTITY REQUEST message cell of the present invention；
Fig. 3: UE IDENTITY RESPONSE message cell of the present invention；
Fig. 4: switching flow figure in base station of the present invention.
Fig. 5: the method for the present invention flow chart.
Specific embodiment
Understand for the ease of those of ordinary skill in the art and implement the present invention, with reference to the accompanying drawings and embodiments to this hair
It is bright to be described in further detail, it should be understood that implementation example described herein is merely to illustrate and explain the present invention, not
For limiting the present invention.
Embodiments of the present invention are introduced below with reference to Fig. 1 to Fig. 5.Embodiment of the present invention specific steps are as follows: step 1:
Train control system mobile terminal accesses first community own base station, and it is mobile that first community own base station obtains train control system
The terminal first information, the second information of train control system mobile terminal or train control system mobile terminal third information, first
Cell own base station is believed according to the state of the train control system mobile terminal first information, train control system mobile terminal second
The state of the state of breath and train control system mobile terminal third information sends query messages to key control node, and first
Cell own base station is established according to the first information of the train control system mobile terminal inquired, the second information, third information
Mapping relations, for marking the train control system mobile terminal in inside of base station；
The first information of train control system mobile terminal described in step 1 is M1, M1For international mobile subscriber identity
IMSI, second information of train control system mobile terminal are M2, and M2 is temporary mobile subscriber identity S-TMSI, the column
Vehicle control mobile terminal third information is M3, and M3 is core net UE Context identifier MME-UE-S1AP-ID, key control
Node is core net MME.
The first information state of train control system mobile terminal described in step 1 is W1If M1Information is present in first community
Then W1=1 and by M1As the mobile terminal first information of first community train control system described in step 1 D1,1, otherwise W1=0；
Second information state of train control system mobile terminal described in step 1 is W2If M2Information is present in first community
Then W2=1 and by M2As the second information of mobile terminal of first community train control system described in step 1 D1,2, otherwise W2=0；
The third information state of train control system mobile terminal described in step 1 is W3If M3Information is present in first community
Then W3=1 and by M3As the mobile terminal third information of first community train control system described in step 1 D1,3, otherwise W3=0；
Query messages are sent to key control node described in step 1 are as follows:
If W1=1, W2=1, W3=1 first community own base station does not need to send query messages to key control node,
Directly by D1,1, D1,2, D1,3According to 3GPP protocol construction D1,1, D1,2, D1,3Mapping relations, and pass through { D1,1, D1,2, D1,3Use
To identify train control system mobile terminal；
If WiIt is not all 1, then first community own base station sends query messages to key control node, takes in query messages
Band WiI-th information of the mobile terminal of=1 (i ∈ [1,3]), key control node is according to the i-th information in query messages, together
By the first information M of mobile terminal1, the second information M2, third information M3It is sent to first community own base station, base station receives pass
By W after the message that key control node is sentiIt is set to 1, and by M1、M2And M3It is stored in inside of base station and labeled as D1,1, D1,2,
D1,3According to 3GPP protocol construction D1,1, D1,2, D1,3Mapping relations, and pass through { D1,1, D1,2, D1,3Be used to identify Train Control
System and mobile terminal.
In step 2, in the switching request message that first community own base station is sent, it is mobile eventually that train control system can be carried
The third information M at end3, second community own base station is by M3Information is stored in inside of base station and labeled as D2,3。
Second community own base station is according to train control system mobile terminal third information D2,3, sent out to key control node
Send train control system mobile terminal enquiry message, key control node is by the first message of the train control system mobile terminal
M1, second message M2, third message M3It is sent to second community own base station together.；
Second community own base station receives the first message M of the terminal after the message that key control node is sent1, second
Message M2It is stored in inside of base station and labeled as D2,1, D2,2, according to 3GPP protocol construction D2,1, D2,2, D2,3Mapping relations, and
Pass through { D2,1, D2,2, D2,3Be used to identify train control system mobile terminal；
In step 2, there are two information memory cells respectively for first community own base station and second community own base station: eventually
End cuts out information memory cell and terminal incision information memory cell.The content of its storage of information memory cell is cut out for terminal
The time is cut out from this cell for the first, second and third information of terminal, switching purpose cell ID and terminal.And terminal cuts information
Its storage content of storage unit is the first, second and third information of terminal, and source cell mark and terminal are cut into the time of this cell.
When terminal is switched to second community from first community, first community is the source cell of this switching, and second is small
Area is the purpose cell of this switching.First community own base station is by the first, second and third information { D of the terminal1,1, D1,2,
D1,3, second community mark successfully leaves the time T of first community with terminal1,outIt is stored in the terminal of first community own base station
It cuts out in information memory cell.If there is a situation where be repeatedly switched to second community, first community institute from first community for terminal
Belong to base station terminal cut out can be stored in information memory cell a plurality of terminal the first, second and third information it is identical, switching purpose cell
It is identified as second community but cuts out time T1,outDifferent information.
Corresponding, second community own base station is by the first, second and third information { D of the terminal2,1, D2,2, D2,3, first community
Mark and terminal successfully cut the time T of second community2,inIt is stored in the terminal incision information storage of second community own base station
In unit.If there is a situation where be repeatedly switched to second community, the terminal of second community own base station from first community for terminal
Incision information memory cell in can store a plurality of terminal the first, second and third information it is identical, switching source cell be identified as first community
But cut-in timing T2,inDifferent information.
Similarly, if there is a situation where be repeatedly switched to first community, second community own base station from second community for terminal
Terminal cut out can be stored in information memory cell a plurality of terminal the first, second and third information it is identical, switching purpose cell ID be
First community still cuts out time T2,outDifferent information.In the terminal incision information memory cell of first community own base station
The first, second and third information that can store a plurality of terminal is identical, switching source cell is identified as second community but cut-in timing T1,inNo
Same information.
Preferably, the timer of the switching historical information cycle timer of first community own base station described in step 3 is long
Degree is tcheck, the power-on time of first community own base station is T1；
The timer length that second community own base station described in step 3 switches historical information cycle timer is t'check,
The power-on time of second community own base station is T2；
The validity that information is stored described in step 3 is verified are as follows:
When the secondary time-out of first community own base station switching historical information cycle timer jth (j=1,2,3,4 ...),
The current time is T1+j*tcheck, the terminal of the first community own base station in first community own base station checking step 2 cuts out
The each information stored in information memory cell and terminal incision information memory cell.Specifically: information is cut out for terminal
Every information in storage unit, the T that will be recorded in every information1,outWith current time T1+j*tcheckIt makes comparisons, if T1+j*
tcheck-T1,out>tcheck, then this information deletion, otherwise remains in terminal and cuts out in information memory cell.For terminal
Cut every information in information memory cell, the T that will be recorded in every information1,inWith current time T1+j*tcheckIt makes comparisons,
If T1+j*tcheck-T1,in>tcheck, then this information deletion, otherwise remains in terminal incision information memory cell.
In CBTC system, tcheckValue can be matched according to the speed of service of train, arrangement of base stations situation etc. in system
Set, guarantee terminal cut out be not in information memory cell two and the above terminal the first, second and third information it is identical, cut
Purpose cell ID is changed to be second community but cut out time T1,outDifferent information, while guaranteeing to cut information storage in terminal
Be not in unit two and the above terminal the first, second and third information is identical, switching source cell is identified as second community still
Cut-in timing T1,inDifferent information.
Similarly, when second community own base station switching historical information cycle timer kth (k=1,2,3,4 ...) is secondary super
Constantly, the current time is T2+k*t'check, the end of the second community own base station in second community own base station checking step 2
End cuts out each information stored in information memory cell and terminal incision information memory cell.Specifically: terminal is cut
Every information in information memory cell out, the T that will be recorded in every information2,outWith current time T2+k*t'checkIt makes comparisons,
If T2+k*t'check-T2,out>t'check, then this information deletion, otherwise remains in terminal and cuts out in information memory cell.
For every information in terminal incision information memory cell, the T that will be recorded in every information2,inWith current time T2+k*
tcheckIt makes comparisons, if T2+k*t'check-T2,in>t'check, then this information deletion, otherwise remains in terminal incision information
In storage unit.
t'checkValue also to be configured according to the speed of service of train, arrangement of base stations situation etc. in CBTC system, guarantee
Terminal cut out be not in information memory cell two and the above terminal the first, second and third information it is identical, switching purpose it is small
Area is identified as first community but cuts out time T2,outDifferent information, while guaranteeing to cut in information memory cell not in terminal
First, second and third information of appearance two and the above terminal is identical, switching source cell is identified as first community but cut-in timing
T2,inDifferent information.
Preferably, second community own base station described in step 4 starts the length of its anti-pingpang handoff punishment timer
For tpunish；
Anti- pingpang handoff processing is carried out described in step 4 are as follows:
Mobile terminal access at this time is in second community, if request is switched to first community from second community, second is small at this time
Area's own base station starts anti-pingpang handoff and punishes timer, timer length tpunish.Sync check second community own base station
Terminal cut out information memory cell and terminal incision information memory cell, be not present if being cut out in information memory cell in terminal
First, second and third information is identical as the mobile terminal and switches purpose cell ID as the information of first community, or cuts in terminal
Enter identical with the mobile terminal there is no the first, second and third information in information memory cell and switches source cell to be identified as first small
The information in area, then second community own base station can be until the duration t of anti-pingpang handoff punishment timerpunishJust allow to move afterwards
Terminal is switched to first community from second community.
If the terminal of second community own base station is cut out in information memory cell, there are first, second and third information and this
Mobile terminal is identical and switches the information that purpose cell ID is first community, and deposits in terminal incision information memory cell
It is identical as the mobile terminal in first, second and third information and switch source cell and be identified as the information of first community, then second
Cell own base station directly allows mobile terminal to be switched to first community from second community.
Preferably, first community own base station described in step 5 starts the length of its anti-pingpang handoff punishment timer
For t'punish；
Anti- pingpang handoff processing is carried out described in step 5 are as follows:
Mobile terminal access at this time is in first community, if request is switched to second community from first community, first is small at this time
Area's own base station starts anti-pingpang handoff and punishes timer, timer length t'punish.The affiliated base of sync check first community
The terminal stood cuts out information memory cell and terminal incision information memory cell, does not deposit if cutting out in information memory cell in terminal
And switching purpose cell ID identical as the mobile terminal in the first, second and third information is the information of second community, or in terminal
And switching source cell identical as the mobile terminal there is no the first, second and third information is identified as second in incision information memory cell
The information of cell, then first community own base station can be until the duration t' of anti-pingpang handoff punishment timerpunishJust allow to move afterwards
Dynamic terminal is switched to second community from first community.
If the terminal of first community own base station is cut out in information memory cell, there are first, second and third information and this
Mobile terminal is identical and switches the information that purpose cell ID is second community, and deposits in terminal incision information memory cell
It is identical as the mobile terminal in first, second and third information and switch source cell and be identified as the information of second community, then first
Cell own base station directly allows mobile terminal to be switched to second community from first community.
Fig. 1 is id information flow chart of the base station to MME inquiry TAU, and base station sends UE IDENTITY REQUEST to MME
Message carries MME-UE-S1AP-ID and ENB-UE-S1AP-ID information, after MME receives information, sends UE IDENTITY
RESPONSE message carries IMSI and S-TMSI information.
It should be understood that the above-mentioned description for preferred embodiment is more detailed, can not therefore be considered to this
The limitation of invention patent protection range, those skilled in the art under the inspiration of the present invention, are not departing from power of the present invention
Benefit requires to make replacement or deformation under protected ambit, fall within the scope of protection of the present invention, this hair
It is bright range is claimed to be determined by the appended claims.
Claims (6)
1. a kind of optimization method of communication-based train control system pingpang handoff, which comprises the following steps:
Step 1: train control system mobile terminal accesses first community own base station, and first community own base station obtains train control
The system and mobile terminal first information, the second information of train control system mobile terminal or train control system mobile terminal third processed
Information, first community own base station are mobile according to state, the train control system of the train control system mobile terminal first information
The state of the second information of terminal and the state of train control system mobile terminal third information are looked into key control node transmission
Message is ask, first community own base station is according to the first information of the train control system mobile terminal inquired, the second information, the
Three information establish mapping relations, for marking the train control system mobile terminal in inside of base station；
Step 2: train control system mobile terminal leaves from first community own base station wireless signal coverage area, into second
Cell own base station wireless signal coverage area, second community own base station also for the train control system mobile terminal
One information, the second information, third information establish mapping relations, mark the train control system mobile terminal for inside of base station,
And for this switching, first community own base station and second community own base station respectively deposit this relevant information switched
Storage is in the information memory cell of respective inside of base station；
Step 3: electricity operation on first community own base station and second community own base station, the affiliated base of synchronous averaging first community
It stands and second community own base station switching historical information validity verifies regular device, storage information is carried out if timer expiry
Validity verify；
Step 4: after train control system mobile terminal is cut into second community own base station by first community own base station, second
Cell own base station starts its anti-pingpang handoff punishment timer, and carries out anti-pingpang handoff processing；
Step 5: after train control system mobile terminal is by second community own base station switchback first community own base station, first is small
Area's own base station starts its anti-pingpang handoff punishment timer, and carries out anti-pingpang handoff processing.
2. the optimization method of communication-based train control system pingpang handoff according to claim 1, it is characterised in that:
The first information of train control system mobile terminal described in step 1 is M1, the letter of train control system mobile terminal second
Breath is M2, and the train control system mobile terminal third information is M3；
The first information state of train control system mobile terminal described in step 1 is W1If M1Information is present in first community then W1
=1 and by M1As the mobile terminal first information of first community train control system described in step 1 D1,1, otherwise W1=0；
Second information state of train control system mobile terminal described in step 1 is W2If M2Information is present in first community then W2
=1 and by M2As the second information of mobile terminal of first community train control system described in step 1 D1,2, otherwise W2=0；
The third information state of train control system mobile terminal described in step 1 is W3If M3Information is present in first community then W3
=1 and by M3As the mobile terminal third information of first community train control system described in step 1 D1,3, otherwise W3=0；
Query messages are sent to key control node described in step 1 are as follows:
If W1=1, W2=1, W3=1 first community own base station does not need to send query messages to key control node, directly
By D1,1, D1,2, D1,3According to 3GPP protocol construction D1,1, D1,2, D1,3Mapping relations, and pass through { D1,1, D1,2, D1,3Be used to mark
Know train control system mobile terminal；
If WiIt is not all 1, then first community own base station sends query messages to key control node, carries W in query messagesi
I-th information of the mobile terminal of=1 (i ∈ [1,3]), key control node will move together according to the i-th information in query messages
The first information M of dynamic terminal1, the second information M2, third information M3It is sent to first community own base station, base station receives crucial control
By W after the message that node processed is sentiIt is set to 1, and by M1、M2And M3It is stored in inside of base station and labeled as D1,1, D1,2, D1,3Root
According to 3GPP protocol construction D1,1, D1,2, D1,3Mapping relations, and pass through { D1,1, D1,2, D1,3It is used to identify train control system shifting
Dynamic terminal.
3. the optimization method of communication-based train control system pingpang handoff according to claim 1, it is characterised in that:
In the switching request message that first community own base station described in step 2 is sent, it is mobile eventually that train control system can be carried
The third information M at end3, second community own base station is by M3Information is stored in inside of base station and labeled as D2,3；
Second community own base station is according to train control system mobile terminal third information D2,3, send and arrange to key control node
Vehicle control mobile terminal enquiry message, key control node is by the first message M of the train control system mobile terminal1、
Second message M2, third message M3It is sent to second community own base station together；；
Second community own base station receives the first message M of the terminal after the message that key control node is sent1, second message
M2It is stored in inside of base station and labeled as D2,1, D2,2, according to 3GPP protocol construction D2,1, D2,2, D2,3Mapping relations, and pass through
{D2,1, D2,2, D2,3Be used to identify train control system mobile terminal；
There are two information memory cells respectively for first community own base station described in step 2 and second community own base station: eventually
End cuts out information memory cell and terminal incision information memory cell；The content of its storage of information memory cell is cut out for terminal
The time is cut out from this cell for the first, second and third information of terminal, switching purpose cell ID and terminal；And terminal cuts information
Its storage content of storage unit is the first, second and third information of terminal, and source cell mark and terminal are cut into the time of this cell；
When terminal is switched to second community from first community, first community is the source cell of this switching, and second community is
For the purpose cell of this switching；First community own base station is by the first, second and third information { D of the terminal1,1, D1,2, D1,3, the
Two cell IDs and terminal successfully leave the time T of first community1,outThe terminal for being stored in first community own base station cuts out letter
It ceases in storage unit；If there is a situation where be repeatedly switched to second community, first community own base station from first community for terminal
Terminal cut out can be stored in information memory cell a plurality of terminal the first, second and third information it is identical, switching purpose cell ID be
Second community still cuts out time T1,outDifferent information；
Corresponding, second community own base station is by the first, second and third information { D of the terminal2,1, D2,2, D2,3, first community mark
The time T of second community is successfully cut with terminal2,inIt is stored in the terminal incision information memory cell of second community own base station
In；If there is a situation where be repeatedly switched to second community, the terminal incision of second community own base station from first community for terminal
The first, second and third information that can store a plurality of terminal in information memory cell is identical, switching source cell is identified as first community still
Cut-in timing T2,inDifferent information；
Similarly, if there is a situation where be repeatedly switched to first community, the end of second community own base station from second community for terminal
End cut out can be stored in information memory cell a plurality of terminal the first, second and third information it is identical, switching purpose cell ID be first
Cell still cuts out time T2,outDifferent information；It can also be deposited in the terminal incision information memory cell of first community own base station
The first, second and third information for storing up a plurality of terminal is identical, switching source cell is identified as second community but cut-in timing T1,inDifferent
Information.
4. the optimization method of communication-based train control system pingpang handoff according to claim 1, it is characterised in that:
The timer length that first community own base station described in step 3 switches historical information cycle timer is tcheck, first
The power-on time of cell own base station is T1；
The timer length that second community own base station described in step 3 switches historical information cycle timer is t'check, second
The power-on time of cell own base station is T2；
The validity that information is stored described in step 3 is verified are as follows:
When the secondary time-out of first community own base station switching historical information cycle timer jth (j=1,2,3,4 ...), currently
Time be T1+j*tcheck, the terminal of the first community own base station in first community own base station checking step 2 cuts out information
The each information stored in storage unit and terminal incision information memory cell；Specifically: information storage is cut out for terminal
Every information in unit, the T that will be recorded in every information1,outWith current time T1+j*tcheckIt makes comparisons, if T1+j*tcheck-
T1,out>tcheck, then this information deletion, otherwise remains in terminal and cuts out in information memory cell；Terminal is cut and is believed
Cease every information in storage unit, the T that will be recorded in every information1,inWith current time T1+j*tcheckIt makes comparisons, if T1+j*
tcheck-T1,in>tcheck, then this information deletion, otherwise remains in terminal incision information memory cell；
In CBTC system, tcheckValue can be configured according to the speed of service of train, arrangement of base stations situation etc. in system, protect
Demonstrate,prove terminal cut out be not in information memory cell two and the above terminal the first, second and third information it is identical, switching purpose
Cell ID is second community but cuts out time T1,outDifferent information, while guaranteeing to cut in information memory cell in terminal
Be not in two and the above terminal the first, second and third information it is identical, when switching source cell is identified as second community but cuts
Between T1,inDifferent information；
Similarly, when second community own base station switches historical information cycle timer kth (k=1,2,3,4 ...) secondary time-out
When, the current time is T2+k*t'check, the terminal of the second community own base station in second community own base station checking step 2
Cut out each information stored in information memory cell and terminal incision information memory cell；Specifically: terminal is cut out
Every information in information memory cell, the T that will be recorded in every information2,outWith current time T2+k*t'checkIt makes comparisons, if
T2+k*t'check-T2,out>t'check, then this information deletion, otherwise remains in terminal and cuts out in information memory cell；It is right
Every information in terminal incision information memory cell, the T that will be recorded in every information2,inWith current time T2+k*tcheck
It makes comparisons, if T2+k*t'check-T2,in>t'check, then this information deletion, otherwise remains in terminal incision information storage
In unit；
t'checkValue also to be configured according to the speed of service of train, arrangement of base stations situation etc. in CBTC system, guarantee at end
End cut out be not in information memory cell two and the above terminal the first, second and third information it is identical, switching purpose cell mark
Know and is first community but cuts out time T2,outDifferent information, while guaranteeing to cut in information memory cell not go out in terminal
First, second and third information of existing two and the above terminal is identical, switching source cell is identified as first community but cut-in timing T2,in
Different information.
5. the optimization method of communication-based train control system pingpang handoff according to claim 1, it is characterised in that:
The length that second community own base station described in step 4 starts its anti-pingpang handoff punishment timer is tpunish；
Anti- pingpang handoff processing is carried out described in step 4 are as follows:
Mobile terminal access at this time is in second community, if request is switched to first community from second community, second community institute at this time
Belong to base station and starts anti-pingpang handoff punishment timer, timer length tpunish；The end of sync check second community own base station
End cuts out information memory cell and terminal incision information memory cell, if cutting out in information memory cell in terminal, there is no the
One, two, three information are identical as the mobile terminal and switch the information that purpose cell ID is first community, or cut in terminal
And switching source cell identical as the mobile terminal there is no the first, second and third information is identified as first community in information memory cell
Information, then second community own base station can until anti-pingpang handoff punishment timer duration tpunishJust allow afterwards mobile whole
End is switched to first community from second community；
If the terminal of second community own base station is cut out in information memory cell, there are first, second and third information and the movement
Terminal it is identical and switch purpose cell ID be first community information, and terminal incision information memory cell in there is also
One the first, second and third information is identical as the mobile terminal and switches the information that source cell is identified as first community, then second is small
Area's own base station directly allows mobile terminal to be switched to first community from second community.
6. the optimization method of communication-based train control system pingpang handoff according to claim 1, it is characterised in that:
The length that first community own base station described in step 5 starts its anti-pingpang handoff punishment timer is t 'punish；
Anti- pingpang handoff processing is carried out described in step 5 are as follows:
Mobile terminal access at this time is in first community, if request is switched to second community from first community, first community institute at this time
Belong to base station and starts anti-pingpang handoff punishment timer, timer length t'punish；Sync check first community own base station
Terminal cuts out information memory cell and terminal incision information memory cell, if cutting out in information memory cell in terminal, there is no the
One, two, three information are identical as the mobile terminal and switch the information that purpose cell ID is second community, or cut in terminal
And switching source cell identical as the mobile terminal there is no the first, second and third information is identified as second community in information memory cell
Information, then first community own base station can until anti-pingpang handoff punishment timer duration t'punishJust allow afterwards mobile whole
End is switched to second community from first community；
If the terminal of first community own base station is cut out in information memory cell, there are first, second and third information and the movement
Terminal it is identical and switch purpose cell ID be second community information, and terminal incision information memory cell in there is also
One the first, second and third information is identical as the mobile terminal and switches the information that source cell is identified as second community, then first is small
Area's own base station directly allows the mobile terminal to be switched to second community from first community.
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