CN105451285A - Cell redirection method based on circuit switched domain fall back (CSFB) - Google Patents
Cell redirection method based on circuit switched domain fall back (CSFB) Download PDFInfo
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Abstract
The invention relates to a cell redirection method based on circuit switched domain fall back (CSFB). The method comprises the following steps: carrying out packet domain service in a current service cell, wherein the current service cell does not support circuit switched domain service; redirecting a terminal to a first target cell capable of carrying out circuit switched domain service; and if the redirection fails, residing in a circuit switched domain continuously, the terminal carrying out cell selection and connecting the terminal to a second target cell capable of carrying out circuit switched domain service. The method can improve conversation establishment success rate when the CSFB-based cell redirection fails, and thus communication quality is improved.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of redirecting cell method based on circuit domain dropping CSFB.
Background technology
Circuit domain dropping (CircuitSwitchedDomainFallBack, be called for short CSFB) subscriber equipment (UserEquipment can be realized, be called for short UE) under LTE access, initiate the circuit switching (CircuitSwitched such as voice, be called for short CS) business, receive the paging of the CS business such as voice, and can to terminal at Long Term Evolution (LongTermEvolution, being called for short LTE) ongoing packet switching under system access (PacketSwitch is called for short PS) business correctly processes.In CSFB technology, in two overlay areas of LTE and 2G/3G, to voice, location service (LocationServices, be called for short LCS) and supplementary service, subscriber equipment can trigger and return back to Generation Mobile Telecommunication System technology (2rd-generation from LTE access, be called for short 2G)/G mobile communication (3rd-generation, be called for short 3G) network insertion carry out CS business.
Current CSFB has become operator the disposes initial stage voice solution choice of technology at LTE.Adopting CSFB to fall after rise to 2G/3G provides the scheme of speech business to make full use of conventional network resources, for user provide reliably, high-quality speech service.
In the prior art, when subscriber equipment (being also terminal) is positioned at the overlapping covered of the networks such as 2G, 3G and LTE, terminal preferentially resides in LTE community.When needs carry out speech business, under terminal needs to reside at 2G or 3G network, to carry out speech business, above-mentioned CSFB process can be carried out.Now, terminal needs to reselect a 2G or 3G community, if under LTE network, LTE determines community to need UE to be redirected to 2G or 3G community, then the radio network controller (RNC) of LTE will cover the mark of 2G or the 3G community of UE current location by wireless heterogeneous networks (RadioResourceControl, being called for short RRC) release message occurs to UE, UE gets a 2G or 3G community, and obtain the system information of this 2G or 3G community, and access this community based on this system information.
But, when the above-mentioned redirecting cell of prior art is failed, can LTE network be returned to, first set up RRC link, under active call or called paging, user/application layer can initiate audio call again, re-start CSFB process and above-mentioned redirecting cell, cause linking expense, calling time delay, system response time is slack-off, affects communication quality and Consumer's Experience.
Summary of the invention
The technical problem that technical solution of the present invention solves is, how during in the redirecting cell failure based on CSFB process, avoids again calling out, to improve communication quality.
In order to solve the problems of the technologies described above, technical solution of the present invention provides a kind of redirecting cell method based on circuit domain dropping CSFB, comprising:
Carry out packet switch domain service in current service cell, circuit domain business is not supported in described current service cell;
Redirect the terminal to the first object community can carrying out circuit domain business;
If described redirected failure, then continue to reside in circuit domain, described terminal performs community and selects, and is connected to the second Target cell can carrying out circuit domain business.
Optionally, the network type of described current service cell and described packet switch domain service type matching, the network type of described first object community and the second Target cell and described circuit domain business type matching.
Optionally, the network type of described current service cell is LTE network, and the network type of described first object community and the second Target cell is 2G network or 3G network.
Optionally, described packet switch domain service is data service, and described circuit domain business is speech business.
Optionally, redirect the terminal to the first object community can carrying out circuit domain business described in comprise: if the circuit domain business notice received, then terminal is redirected described first object community.
Optionally, redirect the terminal to the first object community can carrying out circuit domain business described in comprise:
The base station controller of current service cell receives the cell list of the retargetable that core net sends, and determines the different system neighbor cell list that can carry out circuit domain business;
Issue RRC release message by Radio Resource, the subdistrict frequency point list of the carried out circuit domain business covering terminal current location is sent to this terminal;
Select a community as described first object community based on described subdistrict frequency point list;
Reside at described first object community according to the identification information of described first object community and system information and initiate access.
Optionally, redirect the terminal to the first object community can carrying out circuit domain business described in comprise:
The base station controller of current service cell receives the cell list of the retargetable that core net sends, and determines the different system neighbor cell list that can carry out circuit domain business;
Issue RRC release message by Radio Resource, by covering the subdistrict frequency point list of carried out circuit domain business of terminal current location, the system information of the identification information of first object community and first object community is sent to this terminal;
Reside at described first object community according to the identification information of described first object community and system information and initiate access.
Optionally, if described access failure, then described redirected failure, describedly continues to reside in circuit domain and comprises: described terminal continues to reside at described first object community.
Optionally, described terminal execution community is selected to comprise:
Based on the cell list of the carried out circuit domain business of covering terminal current location, select described second target adjacent area.
Optionally, described terminal execution community is selected also to comprise:
If be connected to based on the second target adjacent area failure selected by the cell list of the carried out circuit domain business covering terminal current location, then the Neighboring Cell List based on terminal Historic preservation selects described second target adjacent area.
Optionally, described terminal execution community is selected also to comprise:
If the second target adjacent area failure that the Neighboring Cell List be connected to based on described terminal Historic preservation is selected, then terminal carries out frequency sweep to obtain initial cell list;
Described second target adjacent area is selected based on the list of described initial cell.
Optionally, described terminal execution community is selected also to comprise:
If described connection failure, then described terminal continues to reside at described second Target cell.
Optionally, described method also comprises:
In advance the cell identity information that there is the carried out circuit domain business occured simultaneously with described current service cell coverage is configured in described base station controller;
The cell identity information covering the carried out circuit domain business of terminal current location is all cell identity information of carrying out circuit domain business be configured in described base station controller.
Optionally, described system information is that described base station controller obtains.
The beneficial effect of technical solution of the present invention at least comprises:
Technical solution of the present invention is when redirecting cell failure, not return to LTE network and re-establish RRC link, but continue to reside in the first object adjacent area (also namely continuing to reside in circuit domain) that network provides, directly attempting finding suitable community in network by terminal (subscriber equipment) carries out resident, and prepare under residing mode, to initiate access, to carry out circuit domain business (can be speech business).
Technical solution of the present invention can reduce again return to LTE network and set up RRC link resource overhead, can in the resident period of redirecting cell and redirecting cell failure, directly continue to select community resident based on the initial call of circuit domain business or initial Page, suitable community can be searched out during the initial call of circuit domain business or initial Page, greatly shorten the time delay again initiated required for circuit domain business, improve system response time, call can also be improved and be created as power, also can shorten and again set up call required time, thus improve communication quality and Consumer's Experience.
In the possibility of technical solution of the present invention, in redirecting cell failure and when selecting community failed based on the Neighboring Cell List of current service cell, terminal can be expanded and select the scope of community: the community resided in the Neighboring Cell List of terminal history maintenance can be selected, or attempt residing at the community that terminal searches net gained comprehensively, to improve reliability and the success rate that terminal selects community.
Accompanying drawing explanation
Fig. 1 is the distribution schematic diagram of LTE network in technical solution of the present invention, 3G network and 2G network coverage;
Fig. 2 is a kind of redirection process Signalling exchange schematic diagram of LTE network;
The schematic flow sheet of a kind of redirecting cell method based on circuit domain dropping CSFB that Fig. 3 provides for technical solution of the present invention;
The method flow schematic diagram of a kind of redirecting cell that Fig. 4 provides for technical solution of the present invention;
The method flow schematic diagram that a kind of community is selected after redirecting cell failure that Fig. 5 provides for technical solution of the present invention.
Embodiment
In order to enable object of the present invention, characteristic sum effect becomes apparent more, elaborates to the specific embodiment of the present invention below in conjunction with accompanying drawing.
Set forth a lot of detail in the following description so that fully understand the present invention, but the present invention can also adopt other to be different from mode described here to implement, therefore the present invention is not by the restriction of following public specific embodiment.
As shown in Figure 1, when deployment of LTE network, the coverage of 2G network can think all standing of gamut 10 to 12, and 3G network may be the continuous covering to scope 11 and scope 12, and LTE network then may realize the covering of scope 12 high speed data service.
For ensureing the continuity of customer service, in conjunction with the progress of LTE, need the interoperability principle that LTE and 3G/2G network is rationally set.Further, the impact also needing the introducing considering to reduce LTE system how to greatest extent to bring to original 3G/2G network.
Continue with reference to figure 1, scope 12 is in current service cell, packet switch domain service (PS business) can be carried out based on LTE network, if and user initiatively initiates audio call or terminal (UE) is called and be subject to paging, then terminal receives circuit domain business notice, can initiate circuit domain business, now carry out CSFB process, namely network falls back to circuit domain by packet domain, and network can be redirected to the 2G cell in scope 12, and terminal this 2G cell resident also initiates to connect.
Adopt and be redirected mode support terminal (UE) from LTE network to the switching of 2G or 3G network, terminal mainly first discharges by its function from evolved UTRAN (E-UTRAN) network, UTRAN (2G or 3G network) frequency point information is carried by being redirected in (redirectionInformation) information of RRC release message (RRCConnectionRelease), also can carry cell identity information and cell broadcast messages further, notifying redirection to terminal is in UTRAN network.After terminal gets back to Idle state, according to the UTRAN frequency point information of LTE network side instruction, again initiate access in UTRAN community.
With reference to figure 2, LTE network comprises to UTRAN network (comprising 2G and 3G network) redirection process:
First, the metrical information between terminal (UE) and LTE network base station (eNB) is mutual:
Base station to terminal transmission MeasurementControl signaling, to carry out frequency Survey control;
Terminal feedback terminal MeasurementReport signaling, with to LTE network base station feedback frequency measurement result.
Secondly, LTE network base station determines that terminal needs to carry out being redirected to UTRAN network (comprising 2G and 3G network), then make being redirected determining (RedirectionDecision).
Then, the mark of 2G or the 3G community covering UE current location occurs to UE by RRC release message by LTE network base station, and the signaling wherein transmitted is RRCConnectionReleasewithRedirection.
Terminal, according to the feedback of LTE network base station, according to the UTRAN frequency point information of base station instruction, is initiated in UTRAN community to access (RandomAccessProcedureinUTRAN) again.
When LTE network is based on reasons such as covering, load, business, translational speeds, cannot for terminal continue to provide good communication service time, now can adopt above-mentioned redirected mode by terminal switch to other network systems.
In the embodiment of the application, the mode of above-mentioned redirected community is specifically because LTE network cannot support circuit domain business (speech business), and when the terminal of resident LTE network needs to carry out circuit domain business, must by terminal switch to 2G or 3G network, with realizing circuit territory business.
Based on the content of above-mentioned redirecting cell, this application provides a kind of redirecting cell method based on circuit domain dropping CSFB, with reference to figure 3, comprise the steps:
Step S100, carries out packet switch domain service in current service cell, and circuit domain business is not supported in described current service cell.
When being in current service cell, terminal can receive the system information of current service cell broadcast, and in the application, the network type of current service cell specially refers to LTE network, and LTE network is supported data business only, is also described packet switch domain service.
The adjacent area network type information of current service cell can be specifically:
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 business and data services, but data transmission bauds is lower.
The system information of the current service cell broadcast that terminal receives carries the network type information of adjacent area, current service cell.Network Recognition current service cell, thinks that terminal provides redirected community.
Described terminal is specifically as follows support multimode terminal, is specially mobile phone, notebook computer, palmtop PC, car-mounted terminal or other-end.Described support multimode terminal refer to can support simultaneously LTE and above-mentioned mention other any one or more than one the terminal of network type.
Continue with reference to figure 3, the described redirecting cell method based on circuit domain dropping CSFB also comprises:
Step S101, redirects the terminal to the first object community can carrying out circuit domain business.
The activation pattern of step S101 can have multiple: when LTE network is based on reasons such as covering, load, business, translational speeds, cannot for terminal continue LTE network service time, can the execution of triggered step S101.The present embodiment receives circuit domain business notice for terminal, because LTE network does not support circuit domain business, therefore can be by above-mentioned redirecting cell, by terminal switch to 2G or 3G community, to carry out circuit domain business.
The type of service of terminal comprises: speech business is main and data service is main.
If the service feature of terminal is based on speech business, the network type of the target adjacent area then matched with the type of service of terminal is 2G/3G, if the service feature type of terminal data service is main, then the network type of the target adjacent area matched with the type of service of terminal is LTE.
In concrete enforcement, terminal both can perform speech business, also can perform data service.Terminal at a time performs speech business, then performs data service in another moment.
If the service feature type of terminal is based on speech business, specifically can refer to that terminal mainly performs speech business, or perform the application of a certain preference speech business;
If the service feature type of terminal is based on data service, specifically can refer to that terminal mainly performs data service, or perform the application of a certain preference data business.
That type of service all may relate to speech business, and terminal can judge whether to receive circuit domain business notice according to its implementation status:
When terminal performs a certain application, it is based on speech business, so, performs data business even if may have, and also can think to have received circuit domain business notice, is redirected to and the community of executive circuit territory business can carries out the Business Processing of this application;
When terminal performs a certain application, it is based on data service, and so, when it performs speech business, terminal is then considered to be and have received circuit domain business notice, is redirected to and the community of executive circuit territory business can carries out the Business Processing of this application.
Whether terminal can also initiate audio call or called by direct-detection terminal, judges whether at execution institute voice traffic.
When terminal judges, it receives circuit domain business notice, then its application layer initiates circuit domain business, and carries out circuit domain dropping process, performs redirecting cell.
With reference to figure 4, described in redirect the terminal to the first object community can carrying out circuit domain business and can comprise the steps:
Step S200, the base station controller of current service cell receives the cell list of the retargetable that core net sends, and determines the different system neighbor cell list that can carry out circuit domain business.
May be there is one or more 2G or 3G community in the surrounding of current service cell, the cell list of described retargetable is 2G or the 3G community of the surrounding of the current service cell that core net gets.
Step S201, issues RRC release message by Radio Resource, and the subdistrict frequency point list of the carried out circuit domain business covering terminal current location is sent to this terminal.
Step S202, selects a community as described first object community based on described subdistrict frequency point list.
Step S203, resides at described first object community according to the identification information of described first object community and system information and initiates access.
In step S201 in step S202, the mode of optimization Network Based is different, the information being sent to terminal can be only adjacent cell frequency list information, it only sends subdistrict frequency point list to terminal, then UE obtains the identification information of the community on these frequencies again based on selected frequency, and and then obtains the system information choosing community.LTE network can follow redirected cell-reselection procedure, and network side, according to end-user scenarios, network congestion situation, provides redirected target frequency.
And under another kind of network optimization mode, being sent in the information of terminal not only to have adjacent cell frequency list information, identification information and the system information of the first object community that network can also be chosen are sent to terminal in the lump.
Wherein, the cell identity information covering the carried out circuit domain business of terminal current location is configured in base station controller in advance, and the cell identity information covering the carried out circuit domain business of terminal current location is all cell identity information of carrying out circuit domain business be configured in described base station controller.And said system information is the acquisition of described base station controller.
Terminal is fed to the redirected cell information of terminal according to network, resides at this community, and circuit domain business can be carried out in this community.
Described community of carrying out circuit domain business is 2G cell or 3G community.Terminal, when receiving circuit domain business notice, directly resides at the redirected community of network-feedback and selection.
Continue with reference to figure 3, the described redirecting cell method based on circuit domain dropping CSFB also comprises:
Step S102, if described redirected failure, then continues to reside in circuit domain, and described terminal performs community and selects, and is connected to the second Target cell can carrying out circuit domain business.
When carrying out redirecting cell according to step S101, and terminal is when residing at first object community, terminal attempts connecting, but, described first object adjacent area may not exist, also may there is the adjacent cell with its co-channel interference in described first object adjacent area, in this case, above-mentioned redirecting cell process may failure.
When described redirecting cell failure, be different from prior art, the terminal network of the application does not return the LTE network of packet domain, but continues to reside in circuit-domain network (can be continue to reside at first object community).
When terminal resides at circuit-domain network community, terminal is selected suitable 2G or 3G community resident voluntarily and is attempted connecting.
Fig. 5 illustrates when step S101 performs cell reselection failure, and terminal performs the process that community is selected:
Step S300, based on the cell list of the carried out circuit domain business of covering terminal current location, selects described second target adjacent area.
In this step, due in the implementation of step S100 and step S101, terminal is based on the system broadcasts of described current service cell, 2G or the 3G Neighboring Cell List of current service cell can be got, when first object adjacent area is redirected unsuccessfully, again based on above-mentioned Neighboring Cell List, again by terminal can be carried out resident and connect in row selection community.
Certainly its selection mode can according to terminal profile, prioritizing selection is carried out: such as according to certain criterion, can by the detection of terminal initiation to signal level or signal quality on the subdistrict frequency point in the cell list of historical storage, selection meets network standard, and (WCDMA network standard is based on RSCP or Ec/N0 index, TD-SCDMA network standard is based on RSCP index, and GSM, GPRS and EDGE network standard are based on RSSI index) historical cell connect; Also can connect based on cell load.
Certainly, if in step S300, the community selected based on the cell list of the carried out circuit domain business covering terminal current location still cannot chosen successfully (community select failed reason can reference cell be redirected failed reason), then continue with reference to figure 5, terminal performs the process selected community and also comprises:
Step S301, the Neighboring Cell List based on terminal Historic preservation selects described second target adjacent area.
From prior art, terminal may store the system broadcasts of received history Serving cell, wherein, stores the Neighboring Cell List of history Serving cell entrained in legacy system broadcast.
Terminal based on current service cell Neighboring Cell List select can executive circuit territory business community failure time, the scope of selected community can be expanded, extend to the Neighboring Cell List of the history Serving cell of terminal storage.Its selection mode can be similar with the selection mode of the Neighboring Cell List based on current service cell: the detection can initiating signal level or signal quality on the subdistrict frequency point in the cell list of historical storage by terminal, selects the historical cell meeting network standard to connect; Also can connect based on cell load.
But, step S301 based on described terminal Historic preservation Neighboring Cell List and the second target adjacent area of selecting also may occur to select unsuccessfully, continue with reference to figure 5, the process that terminal performs community selection also comprises:
Step S302, terminal carries out frequency sweep to obtain initial cell list, selects described second target adjacent area based on the list of described initial cell.
In step s 302, spontaneous having carried out of terminal searches network process, the effective frequency in its searching neighboring area, and attempts resident and connect, and can guarantee the success that the second Target cell is selected and connected.
Certainly, when above-mentioned selection failure, described terminal still continues (the second Target cell after a community selection) that reside in circuit domain community.
Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; the Method and Technology content of above-mentioned announcement can be utilized to make possible variation and amendment to technical solution of the present invention; therefore; every content not departing from technical solution of the present invention; the any simple modification done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all belong to the protection range of technical solution of the present invention.
Claims (14)
1., based on a redirecting cell method of circuit domain dropping CSFB, it is characterized in that, comprising:
Carry out packet switch domain service in current service cell, circuit domain business is not supported in described current service cell;
Redirect the terminal to the first object community can carrying out circuit domain business;
If described redirected failure, then continue to reside in circuit domain, described terminal performs community and selects, and is connected to the second Target cell can carrying out circuit domain business.
2. the method for claim 1, is characterized in that, the network type of described current service cell and described packet switch domain service type matching, the network type of described first object community and the second Target cell and described circuit domain business type matching.
3. method as claimed in claim 1 or 2, it is characterized in that, the network type of described current service cell is LTE network, and the network type of described first object community and the second Target cell is 2G network or 3G network.
4. the method for claim 1, is characterized in that, described packet switch domain service is data service, and described circuit domain business is speech business.
5. the method for claim 1, is characterized in that, described in redirect the terminal to the first object community can carrying out circuit domain business and comprise: if the circuit domain business notice received, then terminal is redirected described first object community.
6. the method for claim 1, is characterized in that, described in redirect the terminal to the first object community can carrying out circuit domain business and comprise:
The base station controller of current service cell receives the cell list of the retargetable that core net sends, and determines the different system neighbor cell list that can carry out circuit domain business;
Issue RRC release message by Radio Resource, the subdistrict frequency point list of the carried out circuit domain business covering terminal current location is sent to this terminal;
Select a community as described first object community based on described subdistrict frequency point list;
Reside at described first object community according to the identification information of described first object community and system information and initiate access.
7. the method for claim 1, is characterized in that, described in redirect the terminal to the first object community can carrying out circuit domain business and comprise:
The base station controller of current service cell receives the cell list of the retargetable that core net sends, and determines the different system neighbor cell list that can carry out circuit domain business;
Issue RRC release message by Radio Resource, by covering the subdistrict frequency point list of carried out circuit domain business of terminal current location, the system information of the identification information of first object community and first object community is sent to this terminal;
Reside at described first object community according to the identification information of described first object community and system information and initiate access.
8. method as claimed in claims 6 or 7, is characterized in that, if described access failure, then described redirected failure, describedly continues to reside in circuit domain and comprise: described terminal continues to reside at described first object community.
9. method as claimed in claims 6 or 7, is characterized in that, described terminal performs community and selects to comprise:
Based on the cell list of the carried out circuit domain business of covering terminal current location, select described second target adjacent area.
10. method as claimed in claim 9, is characterized in that, described terminal performs community and selects also to comprise:
If be connected to based on the second target adjacent area failure selected by the cell list of the carried out circuit domain business covering terminal current location, then the Neighboring Cell List based on terminal Historic preservation selects described second target adjacent area.
11. methods as claimed in claim 10, is characterized in that, described terminal performs community and selects also to comprise:
If the second target adjacent area failure that the Neighboring Cell List be connected to based on described terminal Historic preservation is selected, then terminal carries out frequency sweep to obtain initial cell list;
Described second target adjacent area is selected based on the list of described initial cell.
12. methods as described in claim 10 or 11, is characterized in that, described terminal performs community and selects also to comprise:
If described connection failure, then described terminal continues to reside at described second Target cell.
13. methods as claimed in claims 6 or 7, is characterized in that, also comprise:
In advance the cell identity information that there is the carried out circuit domain business occured simultaneously with described current service cell coverage is configured in described base station controller;
The cell identity information covering the carried out circuit domain business of terminal current location is all cell identity information of carrying out circuit domain business be configured in described base station controller.
14. methods as claimed in claims 6 or 7, is characterized in that, described system information is that described base station controller obtains.
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