CN105657763A - Method and device for realizing circuit switched fallback - Google Patents
Method and device for realizing circuit switched fallback Download PDFInfo
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- CN105657763A CN105657763A CN201410746377.1A CN201410746377A CN105657763A CN 105657763 A CN105657763 A CN 105657763A CN 201410746377 A CN201410746377 A CN 201410746377A CN 105657763 A CN105657763 A CN 105657763A
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Abstract
The invention discloses a method and a device for realizing CSFB (Circuit Switched Fallback). According to the scheme, a terminal, when determining a target cell to be fallen back is in a cell list composed of each of cells corresponding to preliminarily stored cell system messages, can obtain the cell system message corresponding to the target cell from the preliminarily stored cell system messages, and utilizes the obtained cell system message corresponding to the target cell to establish a CSFB call, so that the effect of shortening the call establishing time delay of the CSFB can be achieved on the basis of not needing to reading the corresponding cell system message from a network place again.
Description
Technical field
The present invention relates to mobile communication technology field, particularly relate to a kind of CSFB (CircuitSwitchedFallback, circuit domain dropping) and realize method and apparatus.
Background technology
LTE (LongTermEvolution, Long Term Evolution) is as the follow-up evolution technology of 3G with its high data rate, low time delay and the unique technology advantage such as band width configuration flexibly, and being known as by industry is the evolution tendency of next generation mobile communication. But, due to current LTE terminal mostly with data card, CPE (CustomerPremiseEquipment, client device) etc. data terminal to be main, product category comparatively single relative to existing 3G terminal, thus user cannot be met to the diversified demand of LTE terminal. Furthermore, it is contemplated that LTE is a kind of pure PS territory (PacketSwitch, packet-switched domain) technology, how to solve the focus that the LTE terminal support to voice service is also the research of current industrial circle each side.
Specifically, voice service around the LTE epoch, it is available that industry proposes multiple solution, such as SVLTE (SimultaneousVoiceandLTE, double; two standby) scheme, CSFB scheme and VoLTE (VoiceoverLTE, based on the voice technology of LTE) scheme etc. Wherein, CSFB refers to that the terminal residing in LTE network is due to the needs of speech business, leaves LTE network and returns to the technology of 2G/3G network initiation CS territory (CircuitSwitchedDomain, circuit commutative field) audio call. Wherein, CSFB terminal can be operated in LTE pattern, it is also possible to is operated in 2G/3G pattern, but can only operate under a kind of pattern at synchronization.
Specifically, when CSFB terminal resides in LTE, during such as TD-LTE (time-division LTE) network, if desired voice caller or the audio call such as called are initiated, then network can pass through RRC (RadioResourceControl, wireless heterogeneous networks) speech business of CS territory fallen back in 2G/3G network and completes by redirection process, and ongoing PS domain data service then needs by temporary suspension.
Such as, as it is shown in figure 1, CSFB call flow is broadly divided into three below sub-process:
First pass, the redirection information issued by network is fallen after rise to 2G/3G network; This first pass specifically can include the step 1��step 3 in Fig. 1, and wherein, step 1 is UE (i.e. terminal) the paging step receiving LTE; Step is exhaled in rising that step 2 is UE; Step 3 guides the UE step fallen after rise for LTE;
Second procedure, search 2G/3G network signal also reads corresponding system message; This second procedure specifically can include the step 4 in Fig. 1 and step 5, wherein, and the step that step 4 is changed for terminal pattern, searched for the 2G/3G frequency specified, synchronizes 2G/3G community etc.; Step 5 reads 2G/3G broadcast to obtain the step of corresponding system message for UE;
3rd flow process, carries out audio call in 2G/3G network; 3rd flow process specifically can include the step 6 in Fig. 1, and wherein, step 6 is for setting up corresponding voice call, such as the step of GSM (GlobalSystemforMobileCommunication, global system for mobile communications) call etc.
As shown in the above, directly initiating audio call relative to 2G/3G terminal, CSFB call flow adds two parts flow process such as first pass and second procedure, so that the time delay of CSFB call setup is longer. This is because, falling after rise to GSM for terminal from LTE, terminal need to read GSM broadcast to obtain corresponding system message in second procedure. Specifically, what must read from GSM broadcast due to terminal is the system messages such as SI1 and SI3, and according to Fig. 2, read the shortest used time of full SI1/SI3 be (51*2+4) frame * 4.615ms/ frame=489ms, the longest used time be (51*8+3) frame * 4.615ms/ frame=1897ms, namely, duration needed for reading corresponding system message is longer, so that the duration shared by second procedure is longer, causes that the time delay of final CSFB call setup is longer.
Summary of the invention
Embodiments provide a kind of CSFB and realize method and apparatus, longer thus the problem that causes CSFB calling establishment time delay longer in order to solve the duration due to read system message that presently, there are.
Embodiments provide a kind of CSFB and realize method, including:
Terminal need to fall Target cell extremely after rise when determining initiation CSFB calling;
Judging that described Target cell is whether in the cell list pre-saved, the described cell list each community corresponding to the cell system message pre-saved forms;
If so, then from the cell system message pre-saved, obtain the cell system message corresponding with described Target cell, and utilize the cell system message corresponding with described Target cell got to carry out CSFB call establishment.
Correspondingly, the embodiment of the present invention additionally provides a kind of terminal unit, including:
Determine unit, during for determining initiation CSFB calling, Target cell extremely need to be fallen after rise;
Judging unit, for judging that described Target cell is whether in the cell list pre-saved, the described cell list each community corresponding to the cell system message pre-saved forms;
Processing unit, for when the judged result of described judging unit is for being, from the cell system message pre-saved, obtain the cell system message corresponding with described Target cell, and utilize the cell system message corresponding with described Target cell got to carry out CSFB call establishment.
The present invention has the beneficial effect that:
Embodiments provide a kind of CSFB and realize method and apparatus, in technical scheme described in the embodiment of the present invention, terminal can determine initiation CSFB calling time need to fall after rise Target cell extremely in the cell list that each community corresponding to the cell system message pre-saved forms time, from the cell system message pre-saved, obtain the cell system message corresponding with described Target cell, and utilize the cell system message corresponding with described Target cell got to carry out CSFB call establishment, thus can without again from network read corresponding cell system message basis on, reach the effect of the calling establishment time delay shortening CSFB.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme in the embodiment of the present invention, below the accompanying drawing used required during embodiment is described is briefly introduced, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 show CSFB call flow schematic diagram;
Fig. 2 show GSM broadcast and reads schematic diagram;
Fig. 3 show CSFB described in the embodiment of the present invention one and realizes the schematic flow sheet of method;
Fig. 4 show the structural representation of terminal unit described in the embodiment of the present invention two.
Detailed description of the invention
In order to make the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments. Based on the embodiment in the present invention, all other embodiments that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
Embodiment one:
The embodiment of the present invention one provides a kind of CSFB and realizes method, as it is shown on figure 3, it realizes the schematic flow sheet of method for CSFB described in the embodiment of the present invention one, described CSFB realizes method and specifically can comprise the following steps that
Step 301: terminal need to fall Target cell extremely after rise when determining initiation CSFB calling.
Specifically, similarly to the prior art, the redirection information (wherein portability has corresponding frequency point information etc.) that described terminal can issue according to network, it is determined that initiating required falling Target cell extremely during CSFB calling, this is not repeated by the embodiment of the present invention.
Step 302: judging that described Target cell is whether in the cell list pre-saved, the described cell list each community corresponding to the cell system message pre-saved forms, if so, then performs step 303.
Wherein, the cell system message that described terminal pre-saves can be that the system message that described terminal initiates once to fall after rise when CSFB calls each community extremely according to described terminal is determined, and/or, it is possible to it is that the system message that described terminal initiates once to fall after rise when CSFB calls the neighbor cell of each community extremely according to described terminal is determined. That is, the cell system message that described terminal pre-saves once fell the system message of the neighbor cell of each community extremely after rise when can include the system message and/or the initiation CSFB calling of described terminal that once fell each community extremely when described terminal initiates CSFB calling after rise, this is not limited in any way by the embodiment of the present invention.
Alternatively, the information such as frequency point information and the base station identity code (BSID) that specifically can preserve each community in described cell list.
Correspondingly, it is judged that whether described Target cell is in the cell list pre-saved, it is possible to including:
Obtain the FCCH (FrequencyCorrectionChannel of described Target cell, frequency correction channel) and SCH (SynchronizationChannel, synchronizing channel), and FCCH and SCH according to described Target cell, obtain frequency point information and the base station identity code of described Target cell;
The frequency point information of the frequency point information of described Target cell and base station identity code and described cell list Zhong Ge community and base station identity code are compared, if it is determined that described cell list exists the frequency point information that possesses and consistent with the frequency point information of described Target cell and the base station identity code respectively community of base station identity code, then determine that described Target cell is present in described cell list, otherwise, it is determined that described Target cell does not exist in described cell list.
Further, it should be noted that, the community corresponding to cell system message pre-saved can be GSM cell, WCDMA (WidebandCodeDivisionMultipleAccess, WCDMA) community, TD-SCDMA (TimeDivision-SynchronousCodeDivisionMultipleAccess, TD SDMA) in community or CDMA1X (CDMA 1X, the i.e. first stage of CDMA2000) community any one or multiple.
It is to say, the CSFB described in the embodiment of the present invention realizes method is applicable to the scene from LTE network falling to networks such as GSM, WCDMA, TD-SCDMA or CDMA1X, this is not limited in any way by the embodiment of the present invention.
Step 303: from the cell system message pre-saved, obtains the cell system message corresponding with described Target cell, and utilizes the cell system message corresponding with described Target cell got to carry out CSFB call establishment.
That is, in technical scheme described in the embodiment of the present invention, terminal can determine initiation CSFB calling time required falling Target cell extremely in the cell list that each community corresponding to the cell system message pre-saved forms time, from the cell system message pre-saved, obtain the cell system message corresponding with described Target cell, and utilize the cell system message corresponding with described Target cell got to carry out CSFB call establishment, thus can without again from network read corresponding cell system message basis on, reach the effect of the calling establishment time delay shortening CSFB, the application improving user is experienced.
Further, in technical scheme described in the embodiment of the present invention, also can pre-saving effective duration of the cell system message pre-saved to some extent in described terminal, correspondingly, described method may also include that
Effective duration according to the cell system message pre-saved, determine whether the cell system message pre-saved is in corresponding effect duration, if not, then reacquire cell system message and update the cell system message (simultaneously, it is possible to update the cell list pre-saved) pre-saved according to the cell system message reacquired.
Correspondingly, if it is determined that the cell system message pre-saved is no longer in corresponding effect duration, namely determine that the cell system message pre-saved lost efficacy, then the cell system message pre-saved is updated (mode also by the corresponding community of the cell system message with this inefficacy deleted in the cell list pre-saved updates corresponding cell list simultaneously) by the mode of cell system message that can pass through to delete this inefficacy.
Wherein, in technical scheme described in the embodiment of the present invention, can be that each cell system message pre-saved arranges same effective duration, certainly, also dependent on practical situation, each cell system message for pre-saving arranges different effective durations, and this is not limited in any way by the embodiment of the present invention.
Further, in technical scheme described in the embodiment of the present invention, when pre-saving effective duration of the cell system message pre-saved to some extent in described terminal, after determining that described Target cell is present in the cell list pre-saved, and from the cell system message pre-saved, before obtaining the cell system message corresponding with described Target cell, can also carry out following steps:
Determine in the effect duration whether cell system message corresponding with described Target cell is in setting, if so, then from the cell system message pre-saved, obtain the cell system message corresponding with described Target cell.
Certainly it should be noted that, when the mode of the community corresponding with the cell system message lost efficacy passed through in the cell list that the cell system message pre-saved is updated and is pre-saved by deletion by the mode deleting the cell system message lost efficacy updates corresponding cell list, then after determining that described Target cell is present in the cell list pre-saved, can directly from the cell system message pre-saved, obtain the cell system message corresponding with described Target cell, without again performing the above-mentioned operation determined in the effect duration whether cell system message corresponding with described Target cell is in setting.
Further, in technical scheme described in the embodiment of the present invention, described method may also include that
If it is determined that required falling Target cell extremely is not in the cell list pre-saved during initiation CSFB calling, then read the system message of this Target cell from network, and utilize the system message of the described Target cell read from network to carry out CSFB call establishment.
Correspondingly, after read the system message of this Target cell from network, also can being saved in described terminal by the system message of reading, to realize the renewal to the cell system message pre-saved with perfect, this is not also repeated by the embodiment of the present invention.
The embodiment of the present invention one provides a kind of CSFB and realizes method, in technical scheme described in the embodiment of the present invention one, terminal can determine initiation CSFB calling time need to fall after rise Target cell extremely in the cell list that each community corresponding to the cell system message pre-saved forms time, from the cell system message pre-saved, obtain the cell system message corresponding with described Target cell, and utilize the cell system message corresponding with described Target cell got to carry out CSFB call establishment, thus can without again from network read corresponding cell system message basis on, reach the effect of the calling establishment time delay shortening CSFB.
Embodiment two:
Based on same inventive concept, the embodiment of the present invention two provides a kind of terminal unit, and as shown in Figure 4, it is the structural representation of terminal unit described in the embodiment of the present invention two, and described terminal unit comprises the steps that
Determine that unit 41 need to fall Target cell extremely after rise when can be used for determining initiation CSFB calling.
Judging unit 42 can be used for judging that described Target cell is whether in the cell list pre-saved, and the described cell list each community corresponding to the cell system message pre-saved forms; Wherein, the community corresponding to cell system message pre-saved can for any one in GSM cell, WCDMA community, TD-SCDMA community or CDMA1X community or multiple.
Processing unit 43 can be used for when the judged result of described judging unit 42 is for being, from the cell system message pre-saved, obtain the cell system message corresponding with described Target cell, and utilize the cell system message corresponding with described Target cell got to carry out CSFB call establishment.
Wherein, the cell system message pre-saved described in is that the system message that described terminal unit initiates once to fall after rise when CSFB calls each community extremely according to described terminal unit is determined; And/or, it is that the system message that described terminal unit initiates once to fall after rise when CSFB calls the neighbor cell of each community extremely according to described terminal unit is determined.
Alternatively, described cell list is preserved frequency point information and the base station identity code of each community.
Correspondingly, described judging unit 42 is particularly used in FCCH and SCH obtaining described Target cell FCCH and SCH according to described Target cell, obtains frequency point information and the base station identity code of described Target cell; And, the frequency point information of the frequency point information of described Target cell and base station identity code and described cell list Zhong Ge community and base station identity code are compared, if it is determined that described cell list exists the frequency point information that possesses and consistent with the frequency point information of described Target cell and the base station identity code respectively community of base station identity code, then determine that described Target cell is present in described cell list, otherwise, it is determined that described Target cell does not exist in described cell list.
Further, described processing unit 43 can be additionally used in the effective duration according to the cell system message pre-saved, determine whether the cell system message pre-saved was in effect duration, if it is not, then reacquire cell system message and update the cell system message pre-saved according to the cell system message reacquired.
The embodiment of the present invention two provides a kind of CSFB and realizes equipment, i.e. terminal unit, in technical scheme described in the embodiment of the present invention two, terminal unit can determine initiation CSFB calling time need to fall after rise Target cell extremely in the cell list that each community corresponding to the cell system message pre-saved forms time, from the cell system message pre-saved, obtain the cell system message corresponding with described Target cell, and utilize the cell system message corresponding with described Target cell got to carry out CSFB call establishment, thus can without again from network read corresponding cell system message basis on, reach the effect of the calling establishment time delay shortening CSFB.
Although preferred embodiments of the present invention have been described, but those skilled in the art are once know basic creative concept, then these embodiments can be made other change and amendment. So, claims are intended to be construed to include preferred embodiment and fall into all changes and the amendment of the scope of the invention.
Obviously, the present invention can be carried out various change and modification without deviating from the spirit and scope of the present invention by those skilled in the art. So, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (10)
1. a circuit domain dropping CSFB realizes method, it is characterised in that including:
Terminal need to fall Target cell extremely after rise when determining initiation CSFB calling;
Judging that described Target cell is whether in the cell list pre-saved, the described cell list each community corresponding to the cell system message pre-saved forms;
If so, then from the cell system message pre-saved, obtain the cell system message corresponding with described Target cell, and utilize the cell system message corresponding with described Target cell got to carry out CSFB call establishment.
2. the method for claim 1, it is characterised in that described in the cell system message that pre-saves to be that described terminal once fell the system message of each community extremely when initiating CSFB calling according to described terminal after rise determined; And/or,
It is that the system message that described terminal initiates once to fall after rise when CSFB calls the neighbor cell of each community extremely according to described terminal is determined.
3. method as claimed in claim 1 or 2, it is characterised in that preserve frequency point information and the base station identity code of each community in described cell list;
Judge that described Target cell is whether in the cell list pre-saved, including:
Obtain frequency correction channel FCCH and the synchronous channel SCH of described Target cell FCCH and SCH according to described Target cell, obtain frequency point information and the base station identity code of described Target cell;
The frequency point information of the frequency point information of described Target cell and base station identity code and described cell list Zhong Ge community and base station identity code are compared, if it is determined that described cell list exists the frequency point information that possesses and consistent with the frequency point information of described Target cell and the base station identity code respectively community of base station identity code, then determine that described Target cell is present in described cell list, otherwise, it is determined that described Target cell does not exist in described cell list.
4. method as claimed in claim 1 or 2, it is characterised in that described method also includes:
Effective duration according to the cell system message pre-saved, it is determined that whether the cell system message pre-saved was in effect duration;If it is not, then reacquire cell system message and update the cell system message pre-saved according to the cell system message reacquired.
5. method as claimed in claim 1 or 2, it is characterized in that, the community corresponding to cell system message pre-saved be in global system for mobile communications GSM cell, WCDMA WCDMA community, TD SDMA TD-SCDMA community or CDMA 1XCDMA1X community any one or multiple.
6. a terminal unit, it is characterised in that including:
Determine unit, during for determining initiation circuit domain dropping CSFB calling, Target cell extremely need to be fallen after rise;
Judging unit, for judging that described Target cell is whether in the cell list pre-saved, the described cell list each community corresponding to the cell system message pre-saved forms;
Processing unit, for when the judged result of described judging unit is for being, from the cell system message pre-saved, obtain the cell system message corresponding with described Target cell, and utilize the cell system message corresponding with described Target cell got to carry out CSFB call establishment.
7. terminal unit as claimed in claim 6, it is characterised in that described in the cell system message that pre-saves to be that described terminal unit once fell the system message of each community extremely when initiating CSFB calling according to described terminal unit after rise determined; And/or,
It is that the system message that described terminal unit initiates once to fall after rise when CSFB calls the neighbor cell of each community extremely according to described terminal unit is determined.
8. terminal unit as claimed in claims 6 or 7, it is characterised in that preserve frequency point information and the base station identity code of each community in described cell list;
Described judging unit, specifically for obtaining frequency correction channel FCCH and the synchronous channel SCH of described Target cell, and FCCH and SCH according to described Target cell, obtain frequency point information and the base station identity code of described Target cell; And, the frequency point information of the frequency point information of described Target cell and base station identity code and described cell list Zhong Ge community and base station identity code are compared, if it is determined that described cell list exists the frequency point information that possesses and consistent with the frequency point information of described Target cell and the base station identity code respectively community of base station identity code, then determine that described Target cell is present in described cell list, otherwise, it is determined that described Target cell does not exist in described cell list.
9. terminal unit as claimed in claims 6 or 7, it is characterised in that
Described processing unit, it is additionally operable to the effective duration according to the cell system message pre-saved, determine whether the cell system message pre-saved was in effect duration, if it is not, then reacquire cell system message and update the cell system message pre-saved according to the cell system message reacquired.
10. terminal unit as claimed in claims 6 or 7, it is characterized in that, the community corresponding to cell system message pre-saved be in global system for mobile communications GSM cell, WCDMA WCDMA community, TD SDMA TD-SCDMA community or CDMA 1XCDMA1X community any one or multiple.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410746377.1A CN105657763A (en) | 2014-12-08 | 2014-12-08 | Method and device for realizing circuit switched fallback |
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| CN201410746377.1A CN105657763A (en) | 2014-12-08 | 2014-12-08 | Method and device for realizing circuit switched fallback |
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| CN201410746377.1A Pending CN105657763A (en) | 2014-12-08 | 2014-12-08 | Method and device for realizing circuit switched fallback |
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| CN108124514A (en) * | 2017-09-30 | 2018-06-05 | 深圳市云中飞网络科技有限公司 | The falling result detection method and device of CSFB a kind of, computer storage media |
| CN108124511A (en) * | 2017-09-30 | 2018-06-05 | 深圳市云中飞网络科技有限公司 | The falling result detection method and device of CSFB a kind of, storage medium |
| CN112333789A (en) * | 2020-11-16 | 2021-02-05 | 中国联合网络通信集团有限公司 | Calling method, calling device and terminal |
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Application publication date: 20160608 |