CN105451285B - Redirecting cell method based on circuit domain dropping CSFB - Google Patents
Redirecting cell method based on circuit domain dropping CSFB Download PDFInfo
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- CN105451285B CN105451285B CN201410366718.2A CN201410366718A CN105451285B CN 105451285 B CN105451285 B CN 105451285B CN 201410366718 A CN201410366718 A CN 201410366718A CN 105451285 B CN105451285 B CN 105451285B
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Abstract
The present invention relates to the redirecting cell methods based on circuit domain dropping CSFB.The described method includes: be grouped domain business in current service cell, the current service cell not support circuits domain business；Redirect the terminal to the first object cell that can carry out circuit domain business；If the redirection failure, continue to reside in circuit domain, the terminal executes cell selection, and is connected to the second Target cell that can carry out circuit domain business.The present invention can improve call and be created as power, to improve communication quality when the redirecting cell based on CSFB process fails.
Description
Technical field
The present invention relates to field of communication technology, in particular to a kind of redirecting cell side based on circuit domain dropping CSFB
Method.
Background technique
Circuit domain dropping (Circuit Switched Domain Fall Back, abbreviation CSFB) can be realized user and set
Standby (User Equipment, abbreviation UE) initiates the circuit switching such as voice (Circuit Switched, abbreviation under LTE access
CS) business receives the paging of the CS business such as voice, and can be to terminal in long term evolution (Long Term
Evolution, abbreviation LTE) ongoing packet switch (Packet Switch, abbreviation PS) business carries out under system access
It properly processes.In CSFB technology, in double overlay areas of LTE and 2G/3G, to voice, location service (Location
Services, abbreviation LCS) and supplementary service, user equipment, which can trigger to access from LTE, return back to Generation Mobile Telecommunication System technology
(2rd-generation, abbreviation 2G)/3rd generation mobile communication technology (3rd-generation, abbreviation 3G) network insertion is gone forward side by side
Row CS business.
CSFB has become operator in the choice of technology of LTE deployment initial stage voice solution at present.It is returned using CSFB
The scheme for dropping down onto 2G/3G offer voice service can make full use of conventional network resources, provide reliable, high quality language for user
Sound service.
In the prior art, when user equipment (namely terminal) is located at the overlapping covered of the networks such as 2G, 3G and LTE
Interior, terminal preferentially resides in LTE cell.When needing to carry out voice service, because terminal needs to reside under 2G or 3G network, with
Voice service is carried out, will do it above-mentioned CSFB process.At this point, terminal needs to reselect a 2G or 3G cell, if LTE network
Under, the determination of LTE cell needs for UE to be redirected to 2G or 3G cell, then the radio network controller (RNC) of LTE is worked as UE is covered
The mark of the 2G or 3G cell of front position is discharged by wireless heterogeneous networks (Radio Resource Control, abbreviation RRC)
Message occurs to get a 2G or 3G cell to UE, UE, and obtains the system information of the 2G or 3G cell, and is based on the system
The information access cell.
But when the prior art above-mentioned redirecting cell failure, LTE network can be returned to, RRC link is first established, in master
Under dynamic calling or called paging, user/application layer can initiate audio call again, re-start CSFB process and above-mentioned cell weight
Orientation causes to link expense, and calling delay, system response time is slack-off, influences communication quality and user experience.
Summary of the invention
The technical issues of technical solution of the present invention is solved is, how in the redirecting cell failure based on CSFB process
When, it avoids calling again, to improve communication quality.
In order to solve the above-mentioned technical problem, technical solution of the present invention provides a kind of cell based on circuit domain dropping CSFB
Reorientation method, comprising:
Domain business is grouped in current service cell, the current service cell not support circuits domain business；
Redirect the terminal to the first object cell that can carry out circuit domain business；
If redirection failure, continue to reside in circuit domain, the terminal executes cell selection, and being connected to can be into
Second Target cell of row circuit domain business.
Optionally, the network type of the current service cell and the packet switch domain service type matching, first mesh
The network type and the circuit domain business type matching of mark cell and the second Target cell.
Optionally, the network type of the current service cell is LTE network, the first object cell and the second target
The network type of cell is 2G network or 3G network.
Optionally, the packet switch domain service is data service, and the circuit domain business is voice service.
Optionally, if described redirect the terminal to that can to carry out the first object cell of circuit domain business include: to receive
Circuit domain business notice, then terminal is redirected into the first object cell.
Optionally, described redirect the terminal to can carry out the first object cell of circuit domain business and include:
The base station controller of current service cell receives the cell list of the retargetable of core net transmission, and determination can
Carry out the different system neighbor cell list of circuit domain business；
RRC release message is issued by radio resource, carries out the small of circuit domain business for cover terminal current location
Area's frequency point list is sent to the terminal；
Select a cell as the first object cell based on the subdistrict frequency point list；
The first object cell is resided at according to the identification information of the first object cell and system information and is initiated
Access.
Optionally, described redirect the terminal to can carry out the first object cell of circuit domain business and include:
The base station controller of current service cell receives the cell list of the retargetable of core net transmission, and determination can
Carry out the different system neighbor cell list of circuit domain business；
RRC release message is issued by radio resource, carries out the small of circuit domain business for cover terminal current location
The system information of area's frequency point list, the identification information of first object cell and first object cell is sent to the terminal；
The first object cell is resided at according to the identification information of the first object cell and system information and is initiated
Access.
Optionally, if the access failure, the redirection failure is described to continue to reside in circuit domain to include: described
Terminal continues to reside at the first object cell.
Optionally, the terminal executes cell selection and includes:
Based on the cell list for carrying out circuit domain business of covering terminal current location, select second target adjacent
Area.
Optionally, the terminal executes cell selection further include:
If being connected to the cell list selected second for carrying out circuit domain business based on covering terminal current location
The failure of target adjacent area, then the neighboring cell list based on terminal Historic preservation selects second target adjacent area.
Optionally, the terminal executes cell selection further include:
If be connected to based on the terminal Historic preservation neighboring cell list selection the second target adjacent area failure, terminal into
Row frequency sweep is to obtain initial cell list；
Second target adjacent area is selected based on the initial cell list.
Optionally, the terminal executes cell selection further include:
If the connection failure, the terminal continues to reside at second Target cell.
Optionally, the method also includes:
In advance by there are the cell IDs for carrying out circuit domain business of intersection with the current service cell coverage area
Information configuration is in the base station controller；
The cell identity information for carrying out circuit domain business for covering terminal current location is that configuration is controlled in the base station
All cell identity informations for carrying out circuit domain business in device.
Optionally, the system information is that the base station controller obtains.
The beneficial effect of technical solution of the present invention includes at least:
Technical solution of the present invention not returns to LTE network and re-establishes RRC link when redirecting cell fails,
And it is to continue with the first object adjacent area (namely continuing to reside in circuit domain) that network offer is provided, directly by terminal, (user is set
It is standby) it attempts to find suitable cell in network and is resident, and prepare to initiate access under residing mode, to carry out circuit domain industry
It is engaged in (can be voice service).
Technical solution of the present invention can reduce the resource overhead for returning to LTE network again and establishing RRC link, Neng Gou
Redirecting cell and redirecting cell failure resident period, be directly based upon circuit domain business initial call or initial Page and
Persistently selection cell is resident, can search out suitable cell during the initial call or initial Page of circuit domain business, significantly
Shorten and initiate delay required for circuit domain business again, improves system response time, additionally it is possible to it improves call and is created as power,
It can also shorten the time required to establishing call again, to improve communication quality and user experience.
In the optinal plan of technical solution of the present invention, in redirecting cell failure and adjacent area based on current service cell
When list selects cell failure, the range of terminal selection cell can be expanded: can choose the neighbour for residing at the holding of terminal history
Cell in area's list, or trial reside at terminal and search the resulting cell of net comprehensively, to improve the reliable of terminal selection cell
Property and success rate.
Detailed description of the invention
Fig. 1 is the distribution schematic diagram of LTE network, 3G network and 2G network coverage in technical solution of the present invention；
Fig. 2 is a kind of redirection process Signalling exchange schematic diagram of LTE network；
Fig. 3 is a kind of stream of the redirecting cell method based on circuit domain dropping CSFB provided by technical solution of the present invention
Journey schematic diagram；
Fig. 4 is a kind of method flow schematic diagram of redirecting cell provided by technical solution of the present invention；
Fig. 5 is to show provided by technical solution of the present invention in the method flow of redirecting cell failure latter cell selection
It is intended to.
Specific embodiment
In order to keep the purpose of the present invention, feature and effect more obvious and easy to understand, with reference to the accompanying drawing to of the invention
Specific embodiment elaborates.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, but the present invention can be with
Implemented using other than the one described here mode, therefore the present invention is not limited by the specific embodiments disclosed below.
As shown in Figure 1, the coverage area of 2G network may be considered entire scope 10 to 12 in deployment of LTE network
All standing, and 3G network may be the continuous covering to range 11 and range 12, LTE network can then be able to achieve 12 high speed of range
The covering of data service.
Need rationally to be arranged the mutual behaviour of LTE and 3G/2G network in conjunction with the progress of LTE for the continuity for guaranteeing customer service
Make principle.And it is further desired that considering how to reduce the introducing of LTE system to greatest extent to original 3G/2G network bring
It influences.
It continues to refer to figure 1, is in range 12 in current service cell, domain business (PS can be grouped based on LTE network
Business), and if user actively initiates that audio call or terminal (UE) are called and paged, and it is logical that terminal receives circuit domain business
Know, circuit domain business can be initiated, carry out CSFB process at this time, is i.e. network falls back to circuit domain by packet domain, and network can redirect
2G cell to range 12, terminal are resident the 2G cell and are initiated the connection.
Support terminal (UE) from LTE network to the switching of 2G or 3G network using redirection mode, function mainly will
Terminal is first discharged from evolved UTRAN (E-UTRAN) network, passes through RRC release message (RRC Connection
Release UTRAN (2G or 3G network) frequency point information is carried in redirection (redirection Information) information),
Cell identity information and cell broadcast messages can also be further carried, notifying redirection to terminal is into UTRAN network.In terminal
After returning to Idle state, according to the UTRAN frequency point information that LTE network side indicates, access is re-initiated in UTRAN cell.
With reference to Fig. 2, LTE network to UTRAN network (including 2G and 3G network) redirection process includes:
Firstly, the metrical information between terminal (UE) and LTE network base station (eNB) interacts:
Base station is to terminal transmission Measurement Control signaling, to carry out frequency point measurement control；
Terminal feedback terminal Measurement Report signaling, with to LTE network base station feedback frequency point measurement result.
Secondly, LTE network base station determines that terminal needs redirect UTRAN network (including 2G and 3G network), then
It makes redirection and determines (Redirection Decision).
Then, the mark for covering 2G the or 3G cell of the current location UE is occurred by RRC release message for LTE network base station
To UE, wherein the signaling transmitted is RRC Connection Release with Redirection.
Terminal is according to the feedback of LTE network base station, according to the UTRAN frequency point information that base station indicates, UTRAN cell again
Initiate access (Random Access Procedure in UTRAN).
When LTE network is based on the reasons such as covering, load, business, movement speed, can not continue to provide good lead to for terminal
When telecommunications services, above-mentioned redirection mode can be used at this time and switch the terminal into other network systems.
In embodiments herein, the mode of above-mentioned redirection cell is particularly due to LTE network can not support circuits
Domain business (voice service), and when the terminal of resident LTE network needs to carry out circuit domain business, it is necessary to switch the terminal into 2G
Or 3G network, to realize circuit domain business.
Based on the content of above-mentioned redirecting cell, this application provides a kind of cells based on circuit domain dropping CSFB to reset
Include the following steps: to method with reference to Fig. 3
Step S100 is grouped domain business in current service cell, the current service cell not support circuits domain industry
Business.
When in current service cell, terminal can receive the system information of current service cell broadcast, in the application, when
The network type of preceding serving cell refers exclusively to LTE network, and LTE network only supports data service namely the packet switch domain service.
The adjacent area network type information of current service cell specifically may is that
GSM；
CDMA；
CDMA2000；
WCDMA；
TD-SCDMA；And
LTE。
Wherein, GSM and CDMA belongs to 2G network, and CDMA2000, WCDMA and TD-SCDMA belong to 3G network.2G network and
3G network can support voice service and data service, but data transmission bauds is lower.
The system information for the current service cell broadcast that terminal receives carries the network class of current service cell adjacent area
Type information.Network Recognition current service cell, to provide redirection cell for terminal.
The terminal is specifically as follows support multimode terminal, specially mobile phone, laptop, palm PC, vehicle-mounted end
End or other terminals.It is described support multimode terminal refer to supporting simultaneously LTE and it is mentioned above any other a kind of or
The terminal of more than one network type.
With continued reference to Fig. 3, the redirecting cell method based on circuit domain dropping CSFB further include:
Step S101 redirects the terminal to the first object cell that can carry out circuit domain business.
The triggering form of step S101 can there are many: when LTE network is based on the originals such as covering, load, business, movement speed
Cause can trigger the execution of step S101 when can not continue LTE network service for terminal.The present embodiment receives electricity with terminal
For the service announcements of road domain, because of LTE network not support circuits domain business, therefore can be for by above-mentioned redirecting cell, by terminal
2G or 3G cell is switched to, to carry out circuit domain business.
The type of service of terminal includes: based on voice service and based on data service.
If the service feature of terminal is based on voice service, the net of the target adjacent area to match with the type of service of terminal
Network type is 2G/3G, if based on the service feature type data service of terminal, the mesh that matches with the type of service of terminal
The network type for marking adjacent area is LTE.
In specific implementation, terminal can both execute voice service, can also execute data service.Terminal is at a time
Voice service is executed, then executes data service at another moment.
If the service feature type of terminal is that can specifically refer to that terminal mainly executes voice service based on voice service,
Or execute the application of a certain preference voice service；
If the service feature type of terminal is that can specifically refer to that terminal mainly executes data service based on data service,
Or execute the application of a certain preference data business.
No matter that type of service may all be related to voice service, and terminal can judge whether to connect according to its executive condition
Receive circuit domain business notice:
When terminal executes a certain application, based on voice service, then, even if might have execution data service,
It may be considered and have received circuit domain business notice, the cell for being redirected to executable circuit domain business carries out the industry of the application
Business processing；
When terminal executes a certain application, based on data service, then, when it executes voice service, terminal is then answered
When being considered to have received circuit domain business notice, the cell for being redirected to executable circuit domain business carries out the business of the application
Processing.
Whether terminal can also initiate audio call by directly detecting terminal or be called, and judge whether executing institute's predicate
Sound business.
When terminal judges that it receives circuit domain business notice, then its application layer initiates circuit domain business, and carries out circuit
Domain dropping process executes redirecting cell.
It is described to redirect the terminal to that carry out the first object cell of circuit domain business may include walking as follows with reference to Fig. 4
It is rapid:
Step S200, the base station controller of current service cell receive the cell column of the retargetable of core net transmission
Table, and determination can carry out the different system neighbor cell list of circuit domain business.
There may be one or more 2G or 3G cell around current service cell, the cell of the retargetable is arranged
Table is 2G the or 3G cell around the current service cell that core net is got.
Step S201 issues RRC release message by radio resource, carries out circuit domain for cover terminal current location
The subdistrict frequency point list of business is sent to the terminal.
Step S202 selects a cell as the first object cell based on the subdistrict frequency point list.
It is small to reside at the first object according to the identification information of the first object cell and system information by step S203
It simultaneously initiates to access in area.
In step S201 into step S202, the mode based on the network optimization is different, and the information for being sent to terminal can be only
It is adjacent cell frequency point list information, only sends subdistrict frequency point list to terminal, then UE is obtained based on selected frequency point again
The identification information of cell on these frequency points, and the system information for choosing cell is obtained in turn.It is small that LTE network can follow redirection
Area selects process, and network side is according to end-user scenarios, network congestion situation, to provide the target frequency point of redirection.
And under another network optimization mode, adjacent cell frequency point list letter can be had by being sent in the information of terminal not only
Breath, can also be sent to together terminal for the identification information of the selected first object cell of network and system information.
Wherein, the cell identity information for carrying out circuit domain business for covering terminal current location is to be configured in base in advance
In station control, covering the cell identity information for carrying out circuit domain business of terminal current location is configuration in the base station
All cell identity informations for carrying out circuit domain business in controller.And above system information is that the base station controller obtains
It takes.
Terminal is fed to the redirection cell information of terminal according to network, resides at the cell, which can carry out circuit domain
Business.
The cell for carrying out circuit domain business is 2G cell or 3G cell.Terminal is receiving circuit domain business notice
When, directly reside at the redirection cell of network-feedback and selection.
With continued reference to Fig. 3, the redirecting cell method based on circuit domain dropping CSFB further include:
Step S102 continues to reside in circuit domain if the redirection fails, and the terminal executes cell selection, and
It is connected to the second Target cell that can carry out circuit domain business.
When carrying out redirecting cell according to step S101, and when terminal resides at first object cell, terminal attempts connection,
But the first object adjacent area may be not present, it is also possible to which the first object adjacent area exists small with the neighbour of its co-channel interference
Area, in this case, above-mentioned redirecting cell process may fail.
In the case where redirecting cell failure, it is different from the prior art, the terminal network of the application is not retracted
The LTE network of packet domain, and be to continue with and reside in circuit-domain network (can be to continue with and reside at first object cell).
When terminal resides at circuit-domain network cell, terminal voluntarily selects suitable 2G or 3G cell to be resident and the company of trial
It connects.
Fig. 5 is illustrated in the case where step S101 executes cell reselection failure, and terminal executes the process of cell selection:
Step S300 selects described the based on the cell list for carrying out circuit domain business of covering terminal current location
Two target adjacent areas.
In this step, since in the implementation procedure of step S100 and step S101, terminal is based on the current service
The system broadcasts of cell can get 2G the or 3G neighboring cell list of current service cell, redirect and lose in first object adjacent area
When losing, it can be again based on above-mentioned neighboring cell list, row selection cell is resident and is connected again by terminal.
Its certain selection mode can preferentially be selected according to terminal profile according to certain criterion: for example, can be by terminal
The detection to signal level or signal quality on the subdistrict frequency point in the cell list of historical storage is initiated, selection meets network
Standard (WCDMA network standard be based on RSCP Ec/N0 index, TD-SCDMA network standard be based on RSCP index, and GSM,
GPRS and EDGE network standard are based on RSSI index) historical cell be attached；It may be based on cell load to be connected
It connects.
Certainly, if in step S300, the cell list for carrying out circuit domain business based on covering terminal current location
The cell of selection still can not it is chosen successfully (cell selection failure the reason of can with reference cell redirect failure the reason of), then after
Continuous to refer to Fig. 5, terminal executes the process of cell selection further include:
Step S301, the neighboring cell list based on terminal Historic preservation select second target adjacent area.
From the prior art it is found that terminal may to the system broadcasts of received history serving cell store,
In, it is stored with the neighboring cell list of history serving cell entrained in legacy system broadcast.
Terminal, can be with when the neighboring cell list based on current service cell selects the cell failure of executable circuit domain business
The range for expanding selected cell, extends to the neighboring cell list of the history serving cell of terminal storage.Its selection mode can be with base
Selection mode in the neighboring cell list of current service cell is similar: can be initiated by terminal to small in the cell list of historical storage
The detection of signal level or signal quality on area's frequency point, the historical cell that selection meets network standard are attached；It can also base
It is attached in cell load.
However, neighboring cell list of the step S301 based on the terminal Historic preservation and the second target adjacent area for selecting may also
Selection failure occurs, with continued reference to Fig. 5, terminal executes the process of cell selection further include:
Step S302, terminal are carried out frequency sweep to obtain initial cell list, are selected based on the initial cell list
Second target adjacent area.
In step s 302, terminal is spontaneous has carried out searching network process, the effective frequency point in searching neighboring area, and attempts resident and connect
It connects, it can be ensured that the success of the selection of the second Target cell and connection.
Certainly, in the case where above-mentioned selection failure, the terminal be also to continue with reside in it is (primary in circuit domain cell
The second Target cell after cell selection).
Although the invention has been described by way of example and in terms of the preferred embodiments, but it is not for limiting the present invention, any this field
Technical staff without departing from the spirit and scope of the present invention, may be by the methods and technical content of the disclosure above to this hair
Bright technical solution makes possible variation and modification, therefore, anything that does not depart from the technical scheme of the invention, and according to the present invention
Technical spirit any simple modifications, equivalents, and modifications to the above embodiments, belong to technical solution of the present invention
Protection scope.
Claims (14)
1. a kind of redirecting cell method based on circuit domain dropping CSFB characterized by comprising
Domain business is grouped in current service cell, the current service cell not support circuits domain business；
Terminal is fed to the redirection cell information of terminal according to network, and the first of circuit domain business can be carried out by redirecting the terminal to
Target cell, terminal reside at first object cell；
If the redirection failure, terminal do not retract the network of packet domain, the first object for continuing to reside in network offer is small
Area, the terminal executes cell selection, and is connected to the second Target cell that can carry out circuit domain business, is ready for next time
Circuit domain business, thus improve it is subsequent again initiate circuit domain business when response speed；
It attempts to carry out another secondary circuit domain business.
2. the method as described in claim 1, which is characterized in that the network type of the current service cell and the packet domain
Type of service matching, the network type and the circuit domain business type of the first object cell and the second Target cell
Match.
3. method according to claim 1 or 2, which is characterized in that the network type of the current service cell is LTE net
The network type of network, the first object cell and the second Target cell is 2G network or 3G network.
4. the method as described in claim 1, which is characterized in that the packet switch domain service is data service, the circuit domain industry
Business is voice service.
5. the method as described in claim 1, which is characterized in that described redirect the terminal to can carry out the of circuit domain business
If a Target cell includes: the circuit domain business notice received, terminal is redirected into the first object cell.
6. the method as described in claim 1, which is characterized in that described redirect the terminal to can carry out the of circuit domain business
One Target cell includes:
The base station controller of current service cell receives the cell list of the retargetable of core net transmission, and determination can carry out
The different system neighbor cell list of circuit domain business；
RRC release message is issued by radio resource, the cell frequency for carrying out circuit domain business of terminal current location will be covered
Point list is sent to the terminal；
Select a cell as the first object cell based on the subdistrict frequency point list；
The first object cell is resided at according to the identification information of the first object cell and system information and initiates to access.
7. the method as described in claim 1, which is characterized in that described redirect the terminal to can carry out the of circuit domain business
One Target cell includes:
The base station controller of current service cell receives the cell list of the retargetable of core net transmission, and determination can carry out
The different system neighbor cell list of circuit domain business；
RRC release message is issued by radio resource, the cell frequency for carrying out circuit domain business of terminal current location will be covered
The system information of point list, the identification information of first object cell and first object cell is sent to the terminal；
The first object cell is resided at according to the identification information of the first object cell and system information and initiates to access.
8. method according to claim 6 or 7, which is characterized in that if the access failure, the redirection failure, institute
State that continue to reside in circuit domain include: that the terminal continues to reside at the first object cell.
9. method according to claim 6 or 7, which is characterized in that the terminal executes cell selection and includes:
Based on the cell list for carrying out circuit domain business of covering terminal current location, second target adjacent area is selected.
10. method as claimed in claim 9, which is characterized in that the terminal executes cell selection further include:
If being connected to selected second target of the cell list for carrying out circuit domain business based on covering terminal current location
Adjacent area failure, then the neighboring cell list based on terminal Historic preservation selects second target adjacent area.
11. method as claimed in claim 10, which is characterized in that the terminal executes cell selection further include:
If being connected to the second target adjacent area failure of the neighboring cell list selection based on the terminal Historic preservation, terminal is swept
Frequency is to obtain initial cell list；
Second target adjacent area is selected based on the initial cell list.
12. method as described in claim 10 or 11, which is characterized in that the terminal executes cell selection further include:
If the connection failure, the terminal continues to reside at second Target cell.
13. method according to claim 6 or 7, which is characterized in that further include:
In advance by there are the cell identity informations for carrying out circuit domain business of intersection with the current service cell coverage area
Configuration is in the base station controller；
The cell identity information for carrying out circuit domain business for covering terminal current location is configuration in the base station controller
All cell identity informations for carrying out circuit domain business.
14. method according to claim 6 or 7, which is characterized in that the system information is that the base station controller obtains
's.
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| CN201410366718.2A CN105451285B (en) | 2014-07-29 | 2014-07-29 | Redirecting cell method based on circuit domain dropping CSFB |
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