CN102209370B - LTE multimode terminal has issued the method for circuit domain voice call at LTE access module - Google Patents
LTE multimode terminal has issued the method for circuit domain voice call at LTE access module Download PDFInfo
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Abstract
The invention provides a kind of LTE multimode terminal has issued circuit domain voice call method at LTE access module, terminal is when initiating circuit domain voice call, and initiate to force cell reselection, gravity treatment is on a GERAN or UTRAN community; Terminal is launch position district renewal process on the community of gravity treatment; Terminal initiates normal circuit domain voice call process of establishing on the community of gravity treatment.Technical scheme of the present invention forces when initiating CS territory voice call to carry out cell reselection by terminal, gravity treatment to GERAN and/or UTRAN community is initiated again the method for normal circuit domain voice call process of establishing, whole call flow is simplified, decrease the Signalling exchange in terminal and network, even if terminal is in LTE access technology Schema Registration process and does not support ISR, only have a location area updating process between terminal and network, what decrease between LTE and GERAN/UTRAN core net is mutual simultaneously.
Description
Technical field
The present invention relates to mobile communication long-term evolution system (to be called for short: the voice technologies LTE).Issued the method for circuit domain (being called for short: CS territory) voice call at LTE access module in particular to a kind of LTE multimode terminal.
Background technology
LTE mobile communication system is that (be called for short: communication system IP), be that a grouping system strengthened (is called for short: EPS), so the core net of LTE system has no longer supported the voice service in CS territory to a full Internet protocol.But at the EPS network networking initial stage; if operator has had ripe Digital Radio mobile radio communication or general land radio access web (is called for short: GERAN/UTRAN) network; (be called for short: the protection of CS) investing and packet-based core networks (are called for short: deployment strategy EPC) for circuit domain; operator can adopt original CS territory speech scheme to provide voice service, so (be called for short: the voice call proposing circuit domain 3GPP) (is called for short: CS Fallback) technology solves this problem in third generation cooperative programme.
According to the technical specification TS23.272V9.2.0 version of 3GPP, clearly give in specification in the packet network system of evolution, the specific requirement of CS Fallback.The mode initiating speech falling mainly contains two kinds of modes, and one is under being in LTE access module, and terminal initiates voice call, needs to carry out CS Fallback process, another calling network terminal, the CS Fallback initiated time terminal is in called situation.
The CS Fallback process that terminal initiation voice call sets out as shown in Figure 1, in figure, eNode B is the base station strengthened, BSS is base station sub-system, RNS is Radio Network System, MME is mobile management device, MSC is mobile switch control centre, SGSN is Serving Gateway Service Node, CSFB represents CS Fallback, SRVCC represents that single wireless audio call is continuous, Extend Service Request is the business request information expanded in LTE, enhanced CSFB indicator represents the CSFB instruction of enhancing, S1 refers to the interface between eNode B and MME, Handover Required refers to the handover request that eNode B sends to MME.
In this process, three phases can be divided into:
First stage, the mobile management process of terminal, is mainly reflected in attaching process and the tracing section updating process of terminal, and in this process, terminal notification network, terminal supports CS Fallback function.
Second stage, terminal is initiated voice call process and is fallen back to GERAN/UTRAN process, in this process, the service request that first terminal sends an expansion (is called for short: Extend Service Request) message is to network, and indicating terminal within the message needs to carry out CS Fallback process; Now, if network has obtained the measurement result of terminal GERAN/UTRAN adjacent cell under LTE pattern, network has directly used the switching command of LTE, by terminal switch on GERAN/UTRAN network; Otherwise network is by initiation measuring process, and indicating terminal is measured and reported the measurement result of GERAN/UTRAN adjacent cell, then uses the switching command of LTE, by terminal switch on GERAN/UTRAN network.
Phase III, terminal switch is to after GREAN/UTRAN network, and terminal initiates normal CS calling procedure on objective network, mainly the call establishment of Call Control Block (being called for short: CC module).
The CS Fallback technology that the CS territory voice call that the terminal that above-mentioned 3GPP proposes is initiated adopts, can realize LTE multimode terminal under LTE access module, initiate CS territory voice call, but also there is following problems:
No matter whether network is supported, and the wireless environment what state residing for terminal, all need between terminal and network to carry out RRC process of establishing, authentication and integrity protection process, Survey control process, handoff procedure, aloft (being called for short: Uu interface) all will send Extend Service Request message to interface, substantially the functional module that LTE and GERAN/UTRAN is all is started, and EPC and GERAN/UTRAN that SRVCC will be used to carry out LTE coordinates just can complete, which increase the signaling burden of air interface, too increase the communications burden between each entity interface of core net.
Summary of the invention
For the problems referred to above existed in CS Fallback technology, the invention provides a kind of LTE multimode terminal pattern under LTE access and initiate the method for CS territory voice call, to reduce the signaling bear burden between air interface and each entity interface of core net.
The method and technology scheme that a kind of LTE multimode terminal of the present invention has issued circuit domain voice call at LTE access module is:
Steps A, terminal are initiated to force cell reselection, and gravity treatment is on a GERAN or UTRAN community;
If the registration process of carrying out under step B terminal LTE access technology pattern does not support idle pulley signaling reduction pattern (being called for short, ISR), then terminal launch position district renewal process on the community of gravity treatment;
Step C, terminal initiate normal circuit domain voice call process of establishing on the community of gravity treatment.
Described steps A comprises further:
The application layer of steps A 1, terminal initiates a normal voice call request to terminal Non-Access Stratum;
Steps A 2, Non-Access Stratum send a compulsory cell re-selection command to terminal Access Layer, require that Access Layer selects the community of GERAN or UTRAN;
Steps A 3, Access Layer select a GERAN or UTRAN community as reselection target cell from neighbor cell list, force to carry out cell reselection, and gravity treatment result is reported Non-Access Stratum;
Wherein, described neighbor cell list is that terminal obtains from LTE cell broadcast system messages.
Described steps A 3 comprises further:
Terminal Access Layer finds out GERAN and UTRAN communities all in adjacent cell list;
If terminal did not carry out cell measurement to these communities, then cell measurement was carried out to respective cell;
Terminal is selected to meet the community of resident condition as Target cell in an adjacent cell list according to measurement result, and initiate cell reselection process, gravity treatment is on this community;
Wherein, described resident condition is, the access criteria parameter S > 0 of UTRAN community, or the access criteria parameter C1 value > 0 of GERAN community, and community is not forbidden by network.
Preferably, described Target cell is:
The prominent UTRAN community of Received signal strength code channel of Primary Common Control Physical Channel;
Or the GERAN community that wireless signal broadband power is maximum.
Preferably, described Target cell is:
The GERAN community that base station identity code (being called for short, BSIC) is acknowledged.
Technical scheme of the present invention initiatively carries out cell reselection by terminal when initiating CS territory voice call, gravity treatment to GERAN and/or UTRAN community is initiated again the method for normal circuit domain voice call process of establishing, whole call flow is simplified, decrease the Signalling exchange in terminal and network, only have a location area updating process between terminal and network, what decrease between LTE and GERAN/UTRAN core net is mutual simultaneously.
Accompanying drawing explanation
Fig. 1 is the flow chart of existing CS Fallback Implementation Technology
Fig. 2 is technical solution of the present invention preferred implementation flow chart
Fig. 3 is the specific embodiment of the invention 1 application scenarios figure
Fig. 4 is the specific embodiment of the invention 2 and 3 application scenarios figure
Embodiment
For further illustrating technical scheme of the present invention, providing preferred embodiment below and being described with reference to the accompanying drawings.
Specific embodiment 1
As shown in Figure 3, the terminal of the present embodiment is TD-SCDMA and LTE dual-mode terminal to the application scenarios of the present embodiment.There are a LTE community and three TD-SCDMA communities in region residing for terminal, wherein three TD-SCDMA communities are all the adjacent cells of LTE.
The overall procedure of the present embodiment as shown in Figure 2.
1, select LTE community resident after starting up of terminal, and carry out normal attaching process or tracing section updating process, terminal finally enters into normal idle pulley, in this process, terminal has understood the system message of LTE, and (is called for short: SIB7), net obtains the information of adjacent cell TD-SCDMA cell1, TD-SCDMA cell2, TD-SCDMA cell3 from the system information 7 of LTE.
2, the application layer of terminal initiates the Call Control Block (be called for short: CC module) of voice call request to Non-Access Stratum of a circuit domain;
3, CC module sends business and sets up the EMM module of request signal to Non-Access Stratum;
4, EMM module sends the RRC module of a selection TD-SCDMA cell request to Access Layer;
5, RRC module selects an available TD-SCDMA community as reselection target cell from neighbor cell list, forces to carry out cell reselection, and gravity treatment result is reported Non-Access Stratum;
Wherein, this community is not forbidden by network in described available referring to;
501, RRC module obtains current TD-SCDMA adjacent cell TD-SCDMA cell1, TD-SCDMA cell2, the information of TD-SCDMA cell3 from neighbor cell list;
502, RRC module judges whether to carry out measurement to these TD-SCDMA adjacent cells according to cell information, if perform step 504, otherwise performs step 503;
503, terminal is measured all TD-SCDMA communities in neighbor cell list;
504, RRC module is according to cell measurement results, select the Received signal strength code channel power of a Primary Common Control Physical Channel (to be called for short: P-CCPCH RSCP) the strongest community is as Target cell in the TD-SCDMA community meeting S > 0, initiate cell reselection, gravity treatment is on Target cell;
6, gravity treatment result is reported EMM module by RRC module;
7, judge whether EMM supports ISR in registration process, if directly perform step 8, otherwise EMM module notice MM module launch position district renewal process;
8, after MM module completes location area updating, notice CC module, CC module initiates normal circuit domain voice call process of establishing on the community of gravity treatment.
Specific embodiment 2
As shown in Figure 4, the terminal of the present embodiment is GSM and LTE dual-mode terminal to the application scenarios of the present embodiment.There is LTE community LTE cell and three GSM community GSM cell1, GSM cell2, a GSM cell3 in region residing for terminal, wherein three GSM communities are all the adjacent cells of LTE.
The overall procedure of the present embodiment as shown in Figure 2.
1, select LTE community resident after starting up of terminal, and carry out normal attaching process or tracing section updating process, terminal finally enters into normal idle pulley, in this process, terminal has understood the system message of LTE, and (is called for short: SIB7), net obtains the information of adjacent cell GSM cell1, GSM cell2, GSM cell3 from the system information 7 of LTE.
2, the application layer of terminal initiates the Call Control Block (be called for short: CC module) of voice call request to Non-Access Stratum of a circuit domain;
3, CC module sends business and sets up the EMM module of request signal to Non-Access Stratum;
4, EMM module sends the RRC module of a selection GSM cell request to Access Layer;
5, RRC module selects an available GSM community as reselection target cell from neighbor cell list, forces to carry out cell reselection, and gravity treatment result is reported Non-Access Stratum;
Wherein, this community is not forbidden by network in described available referring to;
501, RRC module obtains current neighboring GSM cell GSM cell1, GSM cell2, the information of GSMcell3 from neighbor cell list;
502, RRC module judges whether to carry out measurement to these neighboring GSM cell according to cell information, if perform step 504, otherwise performs step 503;
503, terminal is measured all GSM communities in neighbor cell list;
504, RRC module is according to cell measurement results, judge whether to there is the acknowledged community of BSIC in the GSM community of all C1 of meeting > 0 if, the community selecting BSIC acknowledged, as Target cell, performs step 506, otherwise performs step 505;
505, RRC module is according to cell measurement results, selects a community that RSSI is the strongest as Target cell in the GSM community meeting C1 > 0;
506, RRC module initiates cell reselection, and gravity treatment is on Target cell
6, gravity treatment result is reported EMM module by RRC module;
7, judge whether EMM supports ISR in registration process, if directly perform step 8, otherwise EMM module notice MM module launch position district renewal process;
8, after MM module completes location area updating, notice CC module, CC module initiates normal circuit domain voice call process of establishing on the community of gravity treatment.
Specific embodiment 3
As shown in Figure 4, overall procedure as shown in Figure 2 for the present embodiment application scenarios.
Step 1 ~ 4 are identical with specific embodiment 2;
5, RRC module selects an available GSM community as reselection target cell from neighbor cell list, forces to carry out cell reselection, and gravity treatment result is reported Non-Access Stratum;
Wherein, this community is not forbidden by network in described available referring to;
501, RRC module obtains current neighboring GSM cell GSM cell1, GSM cell2, the information of GSMcell3 from neighbor cell list;
502, RRC module judges whether to carry out measurement to these neighboring GSM cell according to cell information, if perform step 504, otherwise performs step 503;
503, terminal is measured all GSM communities in neighbor cell list;
504, RRC module is according to cell measurement results, selects a community that RSSI is the strongest as Target cell in the GSM community meeting C1 > 0;
505, RRC module initiates cell reselection, and gravity treatment result is reported EMM module by gravity treatment to Target cell;
Step 6 ~ 8 are identical with specific embodiment 2.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, 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 (4)
1. LTE multimode terminal has issued a method for circuit domain voice call at LTE access module, it is characterized in that, comprising:
Steps A, terminal are initiated to force cell reselection, and gravity treatment is on a Digital Radio mobile radio communication GERAN or general land radio access web UTRAN community;
If the registration process of carrying out under step B terminal LTE access technology pattern does not support idle pulley signaling reduction pattern, then terminal launch position district renewal process on the community of gravity treatment;
Step C, terminal initiate normal circuit domain voice call process of establishing on the community of gravity treatment;
Wherein, described steps A comprises further:
The application layer of steps A 1, terminal initiates a normal voice call request to terminal Non-Access Stratum;
Steps A 2, Non-Access Stratum send a compulsory cell re-selection command to terminal Access Layer, require that Access Layer selects the community of GERAN or UTRAN;
Steps A 3, Access Layer select a GERAN or UTRAN community as reselection target cell from neighbor cell list, force to carry out cell reselection, and gravity treatment result is reported Non-Access Stratum;
Wherein, described neighbor cell list is that terminal obtains from LTE cell broadcast system messages.
2. a kind of LTE multimode terminal according to claim 1 has issued the method for circuit domain voice call at LTE access module, it is characterized in that, described steps A 3 comprises further:
Terminal Access Layer finds out GERAN and UTRAN communities all in adjacent cell list;
If terminal did not carry out cell measurement to these communities, then cell measurement was carried out to respective cell;
Terminal is selected to meet the community of resident condition as Target cell in an adjacent cell list according to measurement result, and initiate cell reselection process, gravity treatment is on this community;
Wherein, described resident condition is, the access criteria parameter S>0 of UTRAN community, or the access criteria parameter C1 value >0 of GERAN community, and community is not forbidden by network.
3. a kind of LTE multimode terminal according to claim 2 has issued the method for circuit domain voice call at LTE access module, and it is characterized in that, described Target cell is:
The prominent UTRAN community of Received signal strength code channel of Primary Common Control Physical Channel;
Or the GERAN community that wireless signal broadband power is maximum.
4. a kind of LTE multimode terminal according to claim 2 has issued the method for circuit domain voice call at LTE access module, and it is characterized in that, described Target cell is:
The GERAN community that base station identity code BSIC is acknowledged.
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| CN103782629B (en) * | 2012-07-13 | 2017-12-05 | 华为技术有限公司 | It is switched to the methods, devices and systems of circuit commutative field |
| US9332460B2 (en) * | 2012-10-23 | 2016-05-03 | Mediatek Inc. | Apparatus and method for circuit switched fallback |
| CN104272801A (en) * | 2013-02-27 | 2015-01-07 | 华为技术有限公司 | Cell handover method, user equipment and base station |
| CN104284343B (en) * | 2013-07-03 | 2018-05-08 | 中国电信股份有限公司 | Dispositions method, system and the dual-mode terminal of VoLTE |
| CN104936246B (en) * | 2014-03-21 | 2019-01-01 | 中国移动通信集团公司 | The SRVCC measurement method and terminal of terminal |
| US10285163B2 (en) | 2014-06-24 | 2019-05-07 | Telefonaktiebolaget Lm Ericsson (Publ) | Management of wireless devices in limited radio coverage |
| CN105451285B (en) * | 2014-07-29 | 2019-04-30 | 展讯通信（上海）有限公司 | Redirecting cell method based on circuit domain dropping CSFB |
| CN105338583B (en) * | 2014-07-29 | 2019-03-29 | 展讯通信（上海）有限公司 | Method for switching network based on circuit domain dropping CSFB |
| CN105451276B (en) * | 2014-07-29 | 2019-06-07 | 展讯通信（上海）有限公司 | Cell remapping method based on circuit domain dropping CSFB |
| US9860870B2 (en) * | 2015-01-26 | 2018-01-02 | Telefonaktiebolaget Lm Ericsson (Publ) | Wireless communications-dynamic coverage class update and aligning coverage class paging groups |
| CN112995972B (en) * | 2017-02-27 | 2022-05-13 | 荣耀终端有限公司 | Call establishment method and terminal equipment |
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