CN102209370A - Method for initiating circuit switch (CS) domain voice call by LTE (long term evolution) multimode terminal under LTE access mode - Google Patents
Method for initiating circuit switch (CS) domain voice call by LTE (long term evolution) multimode terminal under LTE access mode Download PDFInfo
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Abstract
The invention provides a method for initiating a circuit switch (CS) domain voice call by an LTE (long term evolution) multimode terminal under an LTE access mode, and the method comprises: the terminal forcibly initiates cell reselection onto a GERAN (GSM EDGE radio access network) or UTRAN (UMTS terrestrial radio access network) cell when initiating the CS domain voice call; the terminal initiates a location area upgrading process on the reselected cell; and the terminal initiates a normal CS domain voice call building process on the reselected cell. In the technical scheme, the cell reselection is forcibly carried out when the terminal initiates the CS domain voice call, and the normal CS domain voice call building process is initiated when being reselected onto the GERAN or UTRAN cell, so that the whole calling flow is simplified, the signaling interaction between the terminal and a network is reduced, only one location area upgrading process is between the terminal and the network even if an ISR (interrupt service routine) is not supported when the terminal is in the registering process of an LTE access technology mode, the interaction of core networks of the LTE and the GERAN/UTRAN is also decreased.
Description
Technical field
The present invention relates to mobile communication long-term evolution system (is called for short: the speech technology LTE).Be particularly related to a kind of LTE multimode terminal and issued circuit domain (abbreviation: the CS territory) method of voice call at the LTE access module.
Background technology
The LTE mobile communication system be a full Internet protocol (be called for short: communication system IP), be an enhancing grouping system (be called for short: EPS), so the core net of LTE system has no longer been supported the voice service in CS territory.But at the EPS network networking initial stage; if ripe global digital mobile communication network has been arranged in operator or general land radio access web (is called for short: GERAN/UTRAN) network; for (be called for short: CS) Tou Zi protection and packet-based core networks (are called for short: deployment strategy EPC) to circuit domain; operator can adopt original CS territory speech scheme that voice service is provided, so (be called for short: (be called for short: CS Fallback) technology solves this problem to have proposed the voice call of circuit domain 3GPP) in third generation cooperative programme.
According to the technical specification TS23.272V9.2.0 version of 3GPP, in standard, clearly provided in the packet network system of evolution the specific requirement of CS Fallback.Initiate the mode that speech falls after rise and mainly contain dual mode, a kind of is to be under the LTE access module, and terminal is initiated voice call, need carry out CS Fallback process, the CS Fallback that initiates when another calling network terminal, terminal are in called situation.
The CS Fallback process that terminal initiation voice call sets out as shown in Figure 1, among the figure, the base station of eNode B for strengthening, BSS is a base station sub-system, RNS is a Radio Network System, MME is a mobile management device, MSC is mobile switching control center, SGSN is the gateway service node, CSFB represents CS Fallback, SRVCC represents that the single wireless audio call is continuous, Extend Service Request is the business request information of expanding among the LTE, enhanced CSFB indicator represents that the CSFB that strengthens indicates, S1 refers to the interface between eNode B and the MME, Handover Required refers to the handoff request that eNode B sends to MME.
In this process, can be divided into three phases:
Phase I, the mobile management process of terminal is mainly reflected in the attaching process and the tracing section updating process of terminal, in this process, and the terminal informing network, terminal is supported CS Fallback function.
Second stage, terminal is initiated the voice call process and is fallen back to the GERAN/UTRAN process, in this process, terminal at first sends the service request of an expansion, and (be called for short: Extend Service Request) message indicates terminal and need carry out CS Fallback process to network in this message; At this moment, if network has obtained the measurement result of terminal GERAN/UTRAN adjacent cell under the LTE pattern, network directly uses the switching command of LTE, and terminal is switched on the GERAN/UTRAN network; Otherwise network will be initiated a measuring process, and the measurement result of GERAN/UTRAN adjacent cell is measured and reported to indicating terminal, use the switching command of LTE then, and terminal is switched on the GERAN/UTRAN network.
Phase III, terminal switches to after the GREAN/UTRAN network, and terminal is initiated normal CS calling procedure on objective network, mainly is that Call Control Block (is called for short: the call establishment CC module).
The CS Fallback technology that the CS territory voice call that terminal that above-mentioned 3GPP proposed is initiated is adopted, can realize that the LTE multimode terminal initiates CS territory voice call under the LTE access module, but also have following problems:
No matter whether network is supported; and the residing wireless environment what state of terminal; all need to carry out RRC between terminal and the network and set up process; authentication and integrity protection process; measure control procedure; handoff procedure; aloft interface (is called for short: all will send Extend Service Request message the Uu interface); substantially all functional modules of LTE and GERAN/UTRAN have been started; and the EPC and the GERAN/UTRAN that will use SRVCC to carry out LTE coordinate just can finish; increase the signaling burden of air interface like this, also increased the communications burden between each entity interface of core net.
Summary of the invention
At the problems referred to above that exist in the CS Fallback technology, the invention provides a kind of LTE multimode terminal pattern under LTE inserts and initiate the method for CS territory voice call, to reduce the signaling bear burden between each entity interface of air interface and core net.
A kind of LTE multimode terminal of the present invention in the method and technology scheme that the LTE access module has issued the circuit domain voice call is:
Steps A, terminal are initiated to force the sub-district gravity treatment, on gravity treatment to a GERAN or the UTRAN sub-district;
If the registration process of carrying out under the step B terminal LTE access technology pattern does not support that (be called for short, ISR), then terminal is initiated the location area updating process to idle pulley signaling reduction pattern on the sub-district of gravity treatment;
Step C, terminal are initiated normal circuit domain voice call and are set up process on the sub-district of gravity treatment.
Described steps A further comprises:
The application layer of steps A 1, terminal is initiated a normal voice call request to the terminal Non-Access Stratum;
Steps A 2, Non-Access Stratum send a compulsory cell re-selection command to the terminal Access Layer, require Access Layer to select the sub-district of a GERAN or UTRAN;
Steps A 3, Access Layer select a GERAN or UTRAN sub-district as the gravity treatment Target cell from neighbor cell list, force to carry out the sub-district gravity treatment, and the gravity treatment result is reported Non-Access Stratum;
Wherein, described neighbor cell list is that terminal obtains from LTE cell broadcasting system message.
Described steps A 3 further comprises:
The terminal Access Layer is found out GERAN all in the adjacent cell list and UTRAN sub-district;
If terminal was not carried out cell measurement to these sub-districts, then respective cell is carried out cell measurement;
Terminal as Target cell, is initiated cell reselection process according to the sub-district that meets resident condition in adjacent cell list of measurement result selection, and gravity treatment is to this sub-district;
Wherein, described resident condition is, access criteria parameter S＞0 of UTRAN sub-district, or access criteria parameter C1 value＞0 of GERAN sub-district, and the sub-district is not forbidden by network.
Preferably, described Target cell is:
The prominent UTRAN of the received signal code channel sub-district of Primary Common Control Physical Channel;
Or the GERAN sub-district of wireless signal broadband power maximum.
Preferably, described Target cell is:
Base station identity code (is called for short the GERAN sub-district of BSIC) confirming.
Technical scheme of the present invention is initiatively carried out the sub-district gravity treatment by terminal when initiating CS territory voice call, gravity treatment is initiated the method that normal circuit domain voice call is set up process again on GERAN and/or UTRAN sub-district, make whole call flow be simplified, reduced Signalling exchange at terminal and network, a location area updating process is only arranged between terminal and the network, also reduced simultaneously mutual between LTE and the GERAN/UTRAN core net.
Description of drawings
Fig. 1 is the flow chart of existing C S Fallback technology implementation method
Fig. 2 is a 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 specifying technical scheme of the present invention, provide preferred embodiment below and be described with reference to the accompanying drawings.
Specific embodiment 1
The application scenarios of present embodiment as shown in Figure 3, the terminal of present embodiment is TD-SCDMA and LTE dual-mode terminal.There are a LTE sub-district and three TD-SCDMA sub-districts, wherein three adjacent cells that the TD-SCDMA sub-district all is LTE in the terminal zone of living in.
The overall procedure of present embodiment as shown in Figure 2.
1, select the LTE sub-district resident after the starting up of terminal, and normal attaching process or tracing section updating process have been carried out, terminal enters into normal idle pulley at last, in this process, terminal has been understood the system message of LTE, and (be called for short: net has obtained the information of adjacent cell TD-SCDMA cell1, TD-SCDMA cell2, TD-SCDMA cell3 SIB7) from the system information 7 of LTE.
2, the application layer of terminal is initiated the Call Control Block (abbreviation: CC module) of the voice call request of a circuit domain to Non-Access Stratum;
3, the CC module sends the professional EMM module of request signal to Non-Access Stratum of setting up;
4, the EMM module sends a RRC module of selecting TD-SCDMA sub-district request to Access Layer;
5, the RRC module selects an available TD-SCDMA sub-district as the gravity treatment Target cell from neighbor cell list, forces to carry out the sub-district gravity treatment, and the gravity treatment result is reported Non-Access Stratum;
Wherein, described available this sub-district that is meant is not forbidden by network;
501, the RRC module obtains current TD-SCDMA adjacent cell TD-SCDMA cell1, the information of TD-SCDMA cell2, TD-SCDMA cell3 from neighbor cell list;
502, the RRC module judges whether these TD-SCDMA adjacent cells to be carried out measurement according to cell information, if execution in step 504, otherwise execution in step 503;
503, terminal is measured all the TD-SCDMA sub-districts in the neighbor cell list;
504, the RRC module is according to cell measurement results, (be called for short: P-CCPCH RSCP) the strongest sub-district is as Target cell at the received signal code channel power of a Primary Common Control Physical Channel of TD-SCDMA cell selecting that satisfies S＞0, initiate the sub-district gravity treatment, gravity treatment is to Target cell;
6, the RRC module reports the EMM module with the gravity treatment result;
7, judge whether EMM supports ISR in registration process, if direct execution in step 8, otherwise EMM module notice MM module is initiated the location area updating process;
8, after MM module completing place district upgrades, notice CC module, the CC module is initiated normal circuit domain voice call and is set up process on the sub-district of gravity treatment.
Specific embodiment 2
The application scenarios of present embodiment as shown in Figure 4, the terminal of present embodiment is GSM and LTE dual-mode terminal.There are a LTE sub-district LTE cell and three GSM sub-district GSM cell1, GSM cell2, GSM cell3, wherein three adjacent cells that the GSM sub-district all is LTE in the terminal zone of living in.
The overall procedure of present embodiment as shown in Figure 2.
1, select the LTE sub-district resident after the starting up of terminal, and carry out normal attaching process or tracing section updating process, terminal enters into normal idle pulley at last, in this process, terminal has been understood the system message of LTE, and (be called for short: net has obtained the information of adjacent cell GSM cell1, GSM cell2, GSM cell3 SIB7) from the system information 7 of LTE.
2, the application layer of terminal is initiated the Call Control Block (abbreviation: CC module) of the voice call request of a circuit domain to Non-Access Stratum;
3, the CC module sends the professional EMM module of request signal to Non-Access Stratum of setting up;
4, the EMM module sends a RRC module of selecting GSM sub-district request to Access Layer;
5, the RRC module selects an available GSM sub-district as the gravity treatment Target cell from neighbor cell list, forces to carry out the sub-district gravity treatment, and the gravity treatment result is reported Non-Access Stratum;
Wherein, described available this sub-district that is meant is not forbidden by network;
501, the RRC module obtains the information of current GSM adjacent cell GSM cell1, GSM cell2, GSMcell3 from neighbor cell list;
502, the RRC module judges whether these neighboring GSM cell to be carried out measurement according to cell information, if execution in step 504, otherwise execution in step 503;
503, terminal is measured all the GSM sub-districts in the neighbor cell list;
504, the RRC module is according to cell measurement results, judges whether to have sub-district that BSIC confirmed in all GSM sub-districts of satisfying C1＞0 if select sub-district that a BSIC confirmed as Target cell, execution in step 506, otherwise execution in step 505;
505, the RRC module is according to cell measurement results, in sub-district that RSSI is the strongest of the GSM cell selecting that satisfies C1＞0 as Target cell;
506, the RRC module is initiated the sub-district gravity treatment, and gravity treatment is to Target cell
6, the RRC module reports the EMM module with the gravity treatment result;
7, judge whether EMM supports ISR in registration process, if direct execution in step 8, otherwise EMM module notice MM module is initiated the location area updating process;
8, after MM module completing place district upgrades, notice CC module, the CC module is initiated normal circuit domain voice call and is set up process on the sub-district of gravity treatment.
Specific embodiment 3
The present embodiment application scenarios as shown in Figure 4, overall procedure is as shown in Figure 2.
Step 1～4 are identical with specific embodiment 2;
5, the RRC module selects an available GSM sub-district as the gravity treatment Target cell from neighbor cell list, forces to carry out the sub-district gravity treatment, and the gravity treatment result is reported Non-Access Stratum;
Wherein, described available this sub-district that is meant is not forbidden by network;
501, the RRC module obtains the information of current GSM adjacent cell GSM cell1, GSM cell2, GSMcell3 from neighbor cell list;
502, the RRC module judges whether these neighboring GSM cell to be carried out measurement according to cell information, if execution in step 504, otherwise execution in step 503;
503, terminal is measured all the GSM sub-districts in the neighbor cell list;
504, the RRC module is according to cell measurement results, in sub-district that RSSI is the strongest of the GSM cell selecting that satisfies C1＞0 as Target cell;
505, the RRC module is initiated the sub-district gravity treatment, and gravity treatment reports the EMM module to Target cell and with the gravity treatment result;
Step 6～8 are identical with specific embodiment 2.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (5)
1. a LTE multimode terminal has issued the method for circuit domain voice call at the LTE access module, it is characterized in that, comprising:
Steps A, terminal initiate to force the sub-district gravity treatment, on gravity treatment to a global digital mobile communication network GERAN or the general land radio access web UTRAN sub-district;
If the registration process of carrying out under the step B terminal LTE access technology pattern is not supported idle pulley signaling reduction pattern, then terminal is initiated the location area updating process on the sub-district of gravity treatment;
Step C, terminal are initiated normal circuit domain voice call and are set up process on the sub-district of gravity treatment.
2. a kind of LTE multimode terminal according to claim 1 has issued the method for circuit domain voice call at the LTE access module, it is characterized in that described steps A further comprises:
The application layer of steps A 1, terminal is initiated a normal voice call request to the terminal Non-Access Stratum;
Steps A 2, Non-Access Stratum send a compulsory cell re-selection command to the terminal Access Layer, require Access Layer to select the sub-district of a GERAN or UTRAN;
Steps A 3, Access Layer select a GERAN or UTRAN sub-district as the gravity treatment Target cell from neighbor cell list, force to carry out the sub-district gravity treatment, and the gravity treatment result is reported Non-Access Stratum;
Wherein, described neighbor cell list is that terminal obtains from LTE cell broadcasting system message.
3. a kind of LTE multimode terminal according to claim 2 has issued the method for circuit domain voice call at the LTE access module, it is characterized in that described steps A 3 further comprises:
The terminal Access Layer is found out GERAN all in the adjacent cell list and UTRAN sub-district;
If terminal was not carried out cell measurement to these sub-districts, then respective cell is carried out cell measurement;
Terminal as Target cell, is initiated cell reselection process according to the sub-district that meets resident condition in adjacent cell list of measurement result selection, and gravity treatment is to this sub-district;
Wherein, described resident condition is, access criteria parameter S＞0 of UTRAN sub-district, or access criteria parameter C1 value＞0 of GERAN sub-district, and the sub-district is not forbidden by network.
4. a kind of LTE multimode terminal according to claim 3 has issued the method for circuit domain voice call at the LTE access module, it is characterized in that described Target cell is:
The prominent UTRAN of the received signal code channel sub-district of Primary Common Control Physical Channel;
Or the GERAN sub-district of wireless signal broadband power maximum.
5. a kind of LTE multimode terminal according to claim 3 has issued the method for circuit domain voice call at the LTE access module, it is characterized in that described Target cell is:
The GERAN sub-district that base station identity code BSIC confirmed.
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| CN105451276A (en) * | 2014-07-29 | 2016-03-30 | 展讯通信（上海）有限公司 | Cell change order method based on circuit switched domain fall back (CSFB) |
| CN105338583A (en) * | 2014-07-29 | 2016-02-17 | 展讯通信（上海）有限公司 | Network switching method based on circuit switched domain fall back CSFB |
| CN107431561A (en) * | 2015-01-26 | 2017-12-01 | 瑞典爱立信有限公司 | Radio communication dynamic coverage class updates and alignment covering class paging group |
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