CN103167575B - Terminating circuit domain business falls cut-in method and respective network elements after rise in LTE system - Google Patents
Terminating circuit domain business falls cut-in method and respective network elements after rise in LTE system Download PDFInfo
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- CN103167575B CN103167575B CN201110409351.4A CN201110409351A CN103167575B CN 103167575 B CN103167575 B CN 103167575B CN 201110409351 A CN201110409351 A CN 201110409351A CN 103167575 B CN103167575 B CN 103167575B
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Abstract
The invention discloses terminating circuit domain business in a kind of LTE system to fall cut-in method and respective network elements after rise, and the circuit domain business under reducing in a manner of CSFB calls through time delay.The described method includes：After MME receives the CS service calls of UE initiations, by the interface between the preconfigured wireless communication system with 2G or 3G, the wireless controller into 2G or 3G wireless communication systems sends the signaling connection foundation request for the UE；After wireless controller in 2G or 3G systems receives signaling connection foundation request, RRC connections are established for the UE, for the Radio Resource of the UE assignment signallings and CS voice services, and Radio Link process is established to base station initiation for the UE, the Radio Link of signaling and CS voice services is established, resource information is returned into the MME；MME sends the switching command for carrying the resource information to the UE, UE is switched to 2G or 3G wireless communication systems and carries out CS business.
Description
Technical field
The present invention relates to wireless communication system, and in particular to a kind of LTE (Long Term Evolution, Long Term Evolution)
UE (User Equipment, user equipment or terminal) CS (CircuitSwitch, circuit domain) business falls access after rise in system
Method and respective network elements.
Background technology
With the further evolution of wireless communication technique, wireless communication system has evolved to forth generation, namely LTE at present
(Long Term Evolution, Long Term Evolution) wireless communication system, it improves the wireless communication technique eated dishes without rice or wine, employs
OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) technology, it is with higher
Peak throughput, improve power system capacity and reduce system delay the advantages of.
But the LTE system not operation of support circuits domain (CS, Circuit Switch) business in itself, therefore when a nothing
After deploying LTE system in gauze network, the operation for voice service, it has two kinds of implementations：One kind is to use VOIP
(Voice over Internet Protocol, voice transfer protocol or the networking telephone) mode, this mode need to dispose
IMS (IP Mult-imedia Subsystem, IP multimedia subsystem) so that voice service is no longer by circuit domain mode
Access, but is accessed by packet domain (PS, Packet Switch) mode, wireless upper in LTE system access, passes through QoS
(Qualityof Service, service quality) is controlled to ensure the quality of packet domain voice service；Another mode is to use
CSFB (CS Fall Back, circuit domain dropping) mode, this mode need to have deployed 2G or 3G when network is disposed
Wireless communication system, when residing in the user's initiation or the calling in receiving circuit domain of LTE wireless communication systems, then returns to
2G either 3G wireless communication systems and 2G or 3G wireless communication systems initiate circuit domain business.
Network for having deployed 2G or 3G wireless communication systems, the generally use second way carry out circuit
The operation of domain business.Because CSFB modes need user to initiate calling from LTE wireless communication systems and then performed by LTE system
The processing that CSFB is fallen after rise, has directly exhaled circuit domain business to have the increase of time delay compared to user in 2G or 3G network.In order to reduce
The processing delay, at present 3GPP standards introduce RIM (RAN Information Management, RAN information management) process,
For the user that the process to reside in LTE wireless communication systems when initiating circuit domain business, LTE wireless communication systems can be pre-
The information of the Target cell of goal systems first notified the user so that the target that the user can reduce in goal systems is small
The synchronization time in area, so as to reduce access delay.But because the user carries out service call in LTE wireless communication systems, so
After fall back to goal systems and initiate RRC (Radio Connection Control, wireless connection control) connections again and established
Journey, realizes phone domain business using existing CSFB technologies anyway, has directly been exhaled compared to user in 2G or 3G network
Circuit domain business, calls through time delay and is also the increase in.
The content of the invention
The technical problem to be solved in the present invention is to provide in a kind of LTE system terminating circuit domain business fall after rise cut-in method and
Respective network elements, circuit domain business under reducing in a manner of CSFB call through time delay.
Connect in order to solve the above technical problems, being fallen after rise the present invention provides terminating circuit domain (CS) business in a kind of LTE system
Enter method, including：
After mobile management entity (MME) receives the CS service calls of terminal (UE) initiation, pass through preconfigured and 2G
Interface between wireless communication system, the wireless controller transmission into 2G wireless communication systems are built for the signaling connection of the UE
Vertical request, or by the interface between the preconfigured wireless communication system with 3G, it is wireless into 3G wireless communication systems
Controller sends the signaling connection foundation request for the UE；
After wireless controller in 2G the or 3G wireless communication systems receives the signaling connection foundation request, for the UE
RRC connections are established, for the Radio Resource of the UE assignment signallings and CS voice services, and initiate to base station for the UE to establish radio chains
Journey is passed by, establishes the Radio Link of signaling and CS voice services, resource information is returned into the MME；
The MME sends the switching command for carrying the resource information to the UE, UE is switched to 2G or 3G wireless communications
System carries out CS business.
Further, the wireless controller in the 2G wireless communication systems includes base station controller (BSC)；The MME
Interface between 2G wireless communication systems refers to：Interface between the MME and BSC.
Further, the wireless controller in the 3G wireless communication systems includes radio network controller (RNC)；It is described
Interface between MME and 3G wireless communication systems refers to：Interface between the MME and RNC.
Further, wireless controllers of the MME into 2G or 3G wireless communication systems sends the signaling for the UE
Request is established in connection, including：
Wireless controllers of the MME into 2G or 3G wireless communication systems sends signaling connection and establishes request, in request
Carry the identification information of the UE, signaling connection establishes reason and Target Cell Identifier number.
Further, the resource information includes：The radio bearer information of signaling and CS voice services, signaling and CS speeches
The transmitting channel information of business, and physic channel information；
The MME sends the switching command for carrying the resource information to the UE, UE is switched to 2G or 3G wireless communications
System carries out CS business, including：The MME sends switching command to UE, and the signaling and CS words are carried in the switching command
The transmitting channel information of the radio bearer information of sound business, signaling and CS voice services, and physic channel information, the UE are received
To after the switching command, wireless link synchronization is carried out, wireless controller is its foundation in 2G or 3G wireless communication systems
Launch position area renewal process on Radio Link, carries out CS voice services between 2G or 3G wireless communication systems and core net
CS service communications are carried out after appointment process.
Further, the method further includes：While the MME is to UE initiation switching commands, a resource is set to release
Timer is put, after timer time arrival, LTE system discharges the RRC connections of the UE.
Further, the 3G wireless communication systems include wideband code division multiple access (WCDMA) wireless communication system or time-division
S-CDMA-Synchronous Code Division Multiple Access (TD-SCDMA) wireless communication system.
In order to solve the above technical problems, present invention also offers one kind to realize terminating circuit domain (CS) business in LTE system
Fall the mobile management entity (MME) of access after rise, the MME is wireless with wireless controller or 3G in 2G wireless communication systems is led to
The interface of wireless controller in communication system, the MME establish initiation module and handover module including signaling connection, wherein：
The signaling connection establishes initiation module, for receive UE initiation CS service calls after, by with it is described
Interface in 2G wireless communication systems between wireless controller, into the 2G wireless communication systems, wireless controller sends to be directed to and is somebody's turn to do
The signaling connection of UE establishes request, or by the interface between wireless controller in the 3G wireless communication systems, to this
Wireless controller sends the signaling connection foundation request for the UE in 3G wireless communication systems；
The handover module, for the wireless controller in the 2G wireless communication systems are received or 3G wireless communications system
After the resource information that wireless controller returns in system, the switching command for carrying the resource information is sent to the UE, is made described
UE is switched to 2G or 3G wireless communication systems and carries out CS business.
Further, the wireless controller in the 2G wireless communication systems includes base station controller (BSC)；The 3G without
Wireless controller in line communication system includes radio network controller (RNC).
Further, the signaling connection, which establishes initiation module, is used in the following ways into 2G wireless communication systems
Wireless controller sends the signaling connection foundation request for the UE in wireless controller or 3G wireless communication systems：
The signaling connection establishes initiation module wireless controller or 3G wireless communication systems into 2G wireless communication systems
Middle wireless controller sends signaling connection and establishes request, the identification information of the UE is carried in request, signaling connection establishes reason
With Target Cell Identifier number.
Further, the resource information includes：The radio bearer information of signaling and CS voice services, signaling and CS speeches
The transmitting channel information of business, and physic channel information.
Further, the MME further includes timing module, for initiating switching command to the UE in the handover module
When, a resource release timer is set, and after timer time arrival, notice LTE system discharges the RRC connections of the UE.
In order to solve the above technical problems, present invention also offers one kind to realize terminating circuit domain (CS) business in LTE system
Falling the wireless controller of access after rise, the wireless controller has the interface for leading to mobile management entity in LTE system (MME),
The wireless controller includes receiving module, wireless link module and feedback module, wherein：
The receiving module, the signaling connection for certain UE for being sent by the interface MME between MME are built
Vertical request；
The wireless link module, for establishing RRC connections for the UE, for the UE assignment signallings and CS voice services
Radio Resource, and for the UE to base station initiate establish Radio Link process, establish the Radio Link of signaling and CS voice services；
The feedback module, for the resource information established of wireless link module to be returned to the MME.
Further, the wireless controller in the 2G wireless communication systems includes base station controller (BSC)；The 3G without
Wireless controller in line communication system includes radio network controller (RNC).
Further, the signaling connection that the receiving module receives, which is established in request, carries following information：The mark of UE
Information, signaling connection establish reason and Target Cell Identifier number；Information is the wireless link module in accordance with the above
The UE establishes RRC connections, for the Radio Resource of the UE assignment signallings and CS voice services, and initiates to base station for the UE to establish nothing
Wired link process.
Further, the resource information includes：The radio bearer information of signaling and CS voice services, signaling and CS speeches
The transmitting channel information of business, and physic channel information.
The present embodiment method, passes through the mobility management entity (MME in LTE system.MobilityManagement
Entity) increase interface (Iur-L) between the wireless controller of 2G systems or 3G systems, distribute carrier signaling in advance for user
Radio Resource, when the UE being resident in LTE wireless communication systems from 2G or 3G wireless communication systems access CS business when, can keep away
Exempt from user in target access system initiating random access procedure again, compared to existing CSFB technologies, reduce in Target cell
The time that process is established in RRC connections is initiated again, and have the advantages that reduction CS business calls through time delay, in addition, by being built in RRC
Just the Radio Resource of CS voice services is all configured immediately, follow-up RAB (radio access bearer) appointments is reduced and resettles
The time of business radio bearer, further reduces and calls through time delay.
Brief description of the drawings
Fig. 1 is the flow chart of the embodiment of the present invention 1；
Fig. 2 is the flow chart of the embodiment of the present invention 2；
Fig. 3 is the flow chart of the embodiment of the present invention 3；
Fig. 4 is 4 structure diagram of the embodiment of the present invention.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with attached drawing to the present invention
Embodiment be described in detail.It should be noted that in the case where there is no conflict, in the embodiment and embodiment in the application
Feature can mutually be combined.
Embodiment 1
As shown in Figure 1, including：
Step 110, reside in the UE in LTE system and CS service calls are initiated in LTE system；
UE is established in request in the RRC connections sent to LTE system during CS service calls are initiated and is carried TMSI
(Temporary Mobile Subscriber Identity, interim identity) or IMSI (International Mobile
Subscriber Identity, international mobile subscriber identity).
Step 120, the mobile management entity in LTE system (Mobility Management Entity, abbreviation MME) connects
After the CS service calls for receiving UE initiations, by the interface between the preconfigured wireless communication system with 2G, to 2G channel radios
Wireless controller in letter system sends the signaling connection foundation request for the UE, or by preconfigured wireless with 3G
Interface between communication system, the wireless controller transmission into 3G wireless communication systems is established for the signaling connection of the UE please
Ask；
For 2G wireless communication systems, in advance LTE system MME and 2G systems BSC (BaseStation
Controller, base station controller) between configure interface；For 3G wireless communication systems, in advance in the MME and 3G of LTE system
Interface is configured between the RNC (Radio Network Controller, radio network controller) of system, is hereinafter connect above-mentioned
Mouth is referred to as Iur-L interfaces.
Above-mentioned wireless controller includes the RNC in BSC the or 3G systems in 2G systems.
MME to wireless controller initiate signaling connection establish process, while carry the UE identification information (TMSI or
IMSI), signaling connection establishes the information such as reason, Target Cell Identifier number.Wherein, if in step 110, UE is sent to MME
RRC connection request in that carry is TMSI, then the UE identification informations carried in this step are TMSI；If in step 110,
That carried in the RRC connection request that UE is sent to MME is IMSI, then the UE identification informations carried in this step are IMSI.It is above-mentioned
Target Cell Identifier number can be pre-configured with definite by the network planning.
MME decide in its sole discretion to 2G systems initiate signaling connection establish process still to 3G systems initiation signaling connection established
Journey.
Step 130, after the wireless controller in 2G or 3G wireless communication systems receives the signaling connection foundation request, it is
The UE establishes RRC connections, for the Radio Resource of the UE assignment signallings and CS voice services, and initiates to base station for the UE to establish nothing
Wired link process, establishes the Radio Link of signaling and CS voice services, and resource information is returned to the MME of LTE system；
Resource information includes：The radio bearer information of signaling and CS voice services, the transmission letter of signaling and CS voice services
Road information, and physic channel information.If wireless controller establishes RRC connection failures for the UE, or is UE distribution letters
The Radio Resource of order and CS voice services fails, or establishes Radio Link procedure failure for UE initiations, then returns and lose to MME
Response is lost, wherein failure cause can be carried.
Step 140, the MME of LTE wireless communication systems sends the switching command for carrying resource information to the UE, switches UE
CS business is carried out to 2G or 3G wireless communication systems.
Preferably, MME can set a resource release timer (T_Release) at the same time to UE initiation switching commands,
After timer time arrival, LTE system discharges the RRC connections of the UE.
UE is switched to 2G or 3G systems, including：The UE carries out wireless link synchronization (switching with 2G or 3G wireless communication systems
Complete backward 2G or 3G wireless communication systems and return to switching command completion message), which initiates in 2G or 3G wireless communication systems
Location area updating process (UE carries out information exchange with core net), carries out CS words between 2G or 3G wireless communication systems and core net
The appointment process of sound business.Afterwards, UE proceeds by the communication process of CS voice services.
Above-mentioned steps 120 and step 140 are the operations that MME is performed in LTE system, and step 130 is nothing in 2G or 3G systems
The operation that lane controller performs.
The above-mentioned 3G systems being previously mentioned include WCDMA (Wideband Code Division MultipleAccess, it is wide
Band CDMA) wireless communication system or TD-SCDMA (TimeDivision-Synchronous Code Division
Multiple Access, TD SDMA) wireless communication system.
Illustrate the method for embodiment 1 by taking 3G systems are WCDMA and TD-SCDMA as an example separately below.
Embodiment 2
It is as shown in Figure 2, pre-configured this gives the processing method that CS falls back to WCDMA wireless communication systems
Condition：There are Iur-L interfaces between the RNC of the MME and WCDMA wireless communication systems of LTE wireless communication systems.Including following step
Suddenly：
Step 210：UE initiates CS voice service calls in LTE wireless communication systems, wherein carrying the TMSI of UE；
Step 220：The MME entities of LTE wireless communication systems initiate signaling by Iur-L interfaces to the RNC of WCDMA system
Process is established in connection；
Specifically, MME is to the RNC signaling connections sent establish in request message the TMSI for carrying the UE, signaling connection is built
The information such as vertical reason, Target Cell Identifier number；
Signaling connection described herein, which establishes request message, to be included being useful for carrying out the message that signaling connection establishes request.
Step 230：The RNC of WCDMA wireless communication systems is received after the signaling connection establishes request message, then is the UE
RRC connections are established, and are the Radio Resource of the UE assignment signallings and CS voice services；
Step 240：The RNC of WCDMA wireless communication systems initiates to establish Radio Link process for the UE to base station, establishes letter
Order and the Radio Link of CS voice services；
Step 250：The RNC of WCDMA wireless communication systems returns to signaling connection to the MME of LTE wireless communication systems and establishes
Response, wherein the resource information carried includes：The radio bearer information of signaling and CS voice services, signaling and CS voice services
Transmitting channel information, and physic channel information；
Step 260：The MME of LTE wireless communication systems sends the switching command for carrying resource information to the UE, and starts and determine
When device T_release；
Step 270：UE the and WCDMA wireless communication systems carry out wireless link synchronization, and complete to RNC return switching commands
Into message；
Step 2701：Predetermined timer T_release then after, LTE wireless communication systems discharge the RRC of the user
Connection；
Explanation：As long as this step performs after step 260, with step 270,280,290 and 295 without certainty
Precedence relationship.
Step 280：The UE is in WCDMA wireless communication system launch positions area renewal process；
Wherein：Location area updating process is that UE and core net carry out information exchange.
Step 290：The appointment process of CS voice services is carried out between WCDMA wireless communication systems and core net；
Step 295：The UE proceeds by the communication process of CS voice services.
Embodiment 3
This gives the processing method that CS falls back to TD-SCDMA wireless communication systems, as shown in Figure 3.It is prewired
Put condition：There are Iur-L interfaces between the RNC of the MME and TD-SCDMA wireless communication systems of LTE wireless communication systems.Including
Following steps：
Step 310：UE initiates CS voice service calls in LTE wireless communication systems, wherein carrying the IMSI of UE；
Step 320：The MME entities of LTE wireless communication systems are initiated by Iur-L interfaces to the RNC of TD-SCDMA system
Signaling connection establishes process；
Specifically, MME is to the RNC signaling connections sent establish in request message the IMSI for carrying the UE, signaling connection is built
The information such as vertical reason, Target Cell Identifier number；
Step 330：The RNC of TD-SCDMA wireless communication systems is received after the signaling connection establishes request message, then for
The UE establishes RRC connections, and is the Radio Resource of the UE assignment signallings and CS voice services；
Step 340：The RNC of TD-SCDMA wireless communication systems initiates to establish Radio Link process for the UE to base station, builds
The Radio Link of vertical signaling and CS voice services；
Step 350：The RNC of TD-SCDMA wireless communication systems returns to signaling connection to the MME of LTE wireless communication systems and builds
Vertical response, wherein the resource information carried includes：The radio bearer information of signaling and CS voice services, signaling and CS voice services
Transmitting channel information, and physic channel information；
Step 360：The MME of LTE wireless communication systems sends the switching command for carrying resource information to the UE, and starts and determine
When device T_release；
Step 370：UE the and TD-SCDMA wireless communication systems carry out wireless link synchronization, and return to switching life to RNC
Make completion message；
Step 3701：Predetermined timer T_release then after, LTE wireless communication systems discharge the RRC of the user
Connection；
Explanation：This step performs after step 260, with step 370,380,390 and 395 without inevitable priority
Relation.
Step 380：The UE is in TD-SCDMA wireless communication system launch positions area renewal process；
Wherein：Location area updating process is that UE and core net carry out information exchange.
Step 390：The appointment process of CS voice services is carried out between TD-SCDMA wireless communication systems and core net；
Step 395：The UE proceeds by the communication process of CS voice services.
Embodiment 4
Realize terminating circuit domain (CS) business in LTE system fall the system of access after rise as shown in figure 4, including：2G or 3G without
Wireless controller in line communication system, and mobile management entity (MME), it is pre-configured between the wireless controller and MME to connect
Mouthful, wherein：
The MME, for after the CS service calls of UE initiations are received, passing through preconfigured and 2G wireless communications system
Interface between system, the wireless controller into 2G wireless communication systems send the signaling connection foundation request for the UE, or
By the interface between the preconfigured wireless communication system with 3G, the wireless controller into 3G wireless communication systems is sent person
Request is established for the signaling connection of the UE；And for receive wireless controller return resource information after, to the UE
The switching command for carrying the resource information is sent, UE is switched to 2G or 3G wireless communication systems and carries out CS business；
The wireless controller, after establishing request in the signaling connection for receiving MME transmissions, establishes RRC for the UE and connects
Connect, for the Radio Resource of the UE assignment signallings and CS voice services, and initiate to base station for the UE to establish Radio Link process, build
The Radio Link of vertical signaling and CS voice services, the MME is returned to by resource information.
● specifically, it should connect with the MME for leading to wireless controller interface in 2G or 3G wireless communication systems including signaling
Connect and establish initiation module and handover module, wherein：
The signaling connection establishes initiation module, for receive UE initiation CS service calls after, by with it is described
Interface in 2G wireless communication systems between wireless controller, into the 2G wireless communication systems, wireless controller sends to be directed to and is somebody's turn to do
The signaling connection of UE establishes request, or by the interface between wireless controller in the 3G wireless communication systems, to this
Wireless controller sends the signaling connection foundation request for the UE in 3G wireless communication systems；
The handover module, for the wireless controller in the 2G wireless communication systems are received or 3G wireless communications system
After the resource information that wireless controller returns in system, the switching command for carrying the resource information is sent to the UE, is made described
UE is switched to 2G or 3G wireless communication systems and carries out CS business.
Specifically, the signaling connection establish initiation module be used for it is wireless into 2G wireless communication systems in the following ways
Wireless controller sends the signaling connection foundation request for the UE in controller or 3G wireless communication systems：Signaling connection is established
Into 2G wireless communication systems, wireless controller sends signaling connection to initiation module in wireless controller or 3G wireless communication systems
Request is established, the identification information of the UE is carried in request, signaling connection establishes reason and Target Cell Identifier number.
Preferably, which further includes timing module, for the handover module to the UE initiate switching command when,
One resource release timer is set, and after timer time arrival, notice LTE system discharges the RRC connections of the UE.
● specifically, should include receiving module with the wireless controller for leading to MME interfaces, wireless link module with
Feedback module, wherein：
The receiving module, the signaling connection for certain UE for being sent by the interface MME between MME are built
Vertical request；
The wireless link module, for establishing RRC connections for the UE, for the UE assignment signallings and CS voice services
Radio Resource, and for the UE to base station initiate establish Radio Link process, establish the Radio Link of signaling and CS voice services；
The feedback module, for the resource information established of wireless link module to be returned to the MME.
Specifically, the signaling connection which receives, which is established in request, carries following information：The identification information of UE,
Signaling connection establishes reason and Target Cell Identifier number；The wireless link module in accordance with the above for the UE build by information
Vertical RRC connections, for the Radio Resource of the UE assignment signallings and CS voice services, and establish Radio Link for the UE to base station initiation
Process.
Above-mentioned resource information includes：The biography of the radio bearer information of signaling and CS voice services, signaling and CS voice services
Defeated channel information, and physic channel information.
Wireless controller in above-mentioned 2G wireless communication systems includes base station controller (BSC)；In 3G wireless communication systems
Wireless controller include radio network controller (RNC).
One of ordinary skill in the art will appreciate that all or part of step in the above method can be instructed by program
Related hardware is completed, and described program can be stored in computer-readable recording medium, such as read-only storage, disk or CD
Deng.Alternatively, all or part of step of above-described embodiment can also be realized using one or more integrated circuits.Accordingly
Ground, each module/unit in above-described embodiment can be realized in the form of hardware, can also use the shape of software function module
Formula is realized.The present invention is not restricted to the combination of the hardware and software of any particular form.
Certainly, the present invention can also have other various embodiments, ripe in the case of without departing substantially from spirit of the invention and its essence
Know those skilled in the art and make various corresponding changes and deformation in accordance with the present invention, but these change and become accordingly
Shape should all belong to the protection domain of appended claims of the invention.
Claims (14)
1. terminating circuit domain (CS) business falls cut-in method after rise in a kind of LTE system, including：
After mobile management entity (MME) receives the CS service calls of terminal (UE) initiation, by preconfigured wireless with 2G
Interface between communication system, the wireless controller transmission into 2G wireless communication systems is established for the signaling connection of the UE please
Ask, or by the interface between the preconfigured wireless communication system with 3G, the wireless control into 3G wireless communication systems
Device sends the signaling connection foundation request for the UE；
After wireless controller in 2G the or 3G wireless communication systems receives the signaling connection foundation request, established for the UE
RRC connections, for the Radio Resource of the UE assignment signallings and CS voice services, and initiate to establish radio chains and pass by for the UE to base station
Journey, establishes the Radio Link of signaling and CS voice services, and resource information is returned to the MME；
The MME sends the switching command for carrying the resource information to the UE, UE is switched to 2G or 3G wireless communication systems
Carry out CS business；
Wherein, the wireless controller in the 2G wireless communication systems includes base station controller (BSC)；The 3G wireless communications system
Wireless controller in system includes radio network controller (RNC).
2. the method as described in claim 1, it is characterised in that：
Interface between MME the and 2G wireless communication systems refers to：Interface between the MME and BSC.
3. the method as described in claim 1, it is characterised in that：
Interface between MME the and 3G wireless communication systems refers to：Interface between the MME and RNC.
4. the method as described in claim 1 or 2 or 3, it is characterised in that：
Wireless controllers of the MME into 2G or 3G wireless communication systems sends the signaling connection foundation request for the UE,
Including：
Wireless controllers of the MME into 2G or 3G wireless communication systems sends signaling connection and establishes request, is carried in request
There are the identification information of the UE, signaling connection to establish reason and Target Cell Identifier number.
5. the method as described in claim 1 or 2 or 3, it is characterised in that：
The resource information includes：The radio bearer information of signaling and CS voice services, the transmission letter of signaling and CS voice services
Road information, and physic channel information；
The MME sends the switching command for carrying the resource information to the UE, UE is switched to 2G or 3G wireless communication systems
CS business is carried out, including：The MME sends switching command to UE, and the signaling and CS speech industry are carried in the switching command
The transmitting channel information of the radio bearer information of business, signaling and CS voice services, and physic channel information, the UE receive institute
After stating switching command, wireless link synchronization is carried out, wireless controller is the wireless of its foundation in 2G or 3G wireless communication systems
Launch position area renewal process on link, carries out the appointment of CS voice services between 2G or 3G wireless communication systems and core net
CS service communications are carried out after process.
6. the method as described in claim 1 or 2 or 3, it is characterised in that：
The method further includes：While the MME is to UE initiation switching commands, a resource release timer is set, fixed
When the device time reach after, LTE system discharges the RRC connections of the UE.
7. the method as described in claim 1 or 2 or 3, it is characterised in that：
The 3G wireless communication systems include wideband code division multiple access (WCDMA) wireless communication system or TD SDMA
(TD-SCDMA) wireless communication system.
8. one kind realizes that terminating circuit domain (CS) business falls the mobile management entity (MME) accessed, the MME after rise in LTE system
With the interface for leading to wireless controller in wireless controller in 2G wireless communication systems or 3G wireless communication systems, the MME
Initiation module and handover module are established including signaling connection, wherein：
The signaling connection establishes initiation module, for receive UE initiation CS service calls after, by with the 2G without
Interface in line communication system between wireless controller, into the 2G wireless communication systems, wireless controller is sent for the UE's
Signaling connection establishes request, or by the interface between wireless controller in the 3G wireless communication systems, to the 3G without
Wireless controller sends the signaling connection foundation request for the UE in line communication system；
The handover module, in wireless controller in receiving the 2G wireless communication systems or 3G wireless communication systems
After the resource information that wireless controller returns, the switching command for carrying the resource information is sent to the UE, cuts the UE
Change to 2G or 3G wireless communication systems and carry out CS business；
Wherein, the wireless controller in the 2G wireless communication systems includes base station controller (BSC)；The 3G wireless communications system
Wireless controller in system includes radio network controller (RNC).
9. mobile management entity as claimed in claim 8, it is characterised in that：
The signaling connection establish initiation module be used in the following ways into 2G wireless communication systems wireless controller or
Wireless controller sends the signaling connection foundation request for the UE in 3G wireless communication systems：
The signaling connection establishes initiation module nothing in wireless controller or 3G wireless communication systems into 2G wireless communication systems
Lane controller sends signaling connection and establishes request, the identification information of the UE is carried in request, signaling connection establishes reason and mesh
Mark Cell Identity CI.
10. mobile management entity as claimed in claim 8, it is characterised in that：
The resource information includes：The radio bearer information of signaling and CS voice services, the transmission letter of signaling and CS voice services
Road information, and physic channel information.
11. mobile management entity as claimed in claim 8, it is characterised in that：
The MME further includes timing module, for when the handover module initiates switching command to the UE, setting a resource
Release timer, after timer time arrival, notice LTE system discharges the RRC connections of the UE.
12. one kind realizes that terminating circuit domain (CS) business falls the wireless controller accessed, the wireless controller after rise in LTE system
With the interface for leading to mobile management entity in LTE system (MME), the wireless controller includes receiving module, Radio Link
Module and feedback module are established, wherein：
The receiving module, the signaling connection for certain UE for being sent by the interface MME between MME is established please
Ask；
The wireless link module, for establishing RRC connections for the UE, for the UE assignment signallings and the nothing of CS voice services
Line resource, and Radio Link process is established to base station initiation for the UE, establish the Radio Link of signaling and CS voice services；
The feedback module, for the resource information established of wireless link module to be returned to the MME；
Wherein, the wireless controller includes the base station controller (BSC) or 3G wireless communication systems in 2G wireless communication systems
In radio network controller (RNC)；
The receiving module, the signaling connection for certain UE for being sent by the interface MME between MME is established please
Ask including：
After the CS service calls that the MME receives UE initiations, sent by the interface MME between the BSC and MME
The signaling connection for the UE establish request, or being directed to by what interface MME between the RNC and MME was sent
The signaling connection of the UE establishes request.
13. wireless controller as claimed in claim 12, it is characterised in that：
The signaling connection that the receiving module receives is established in request and carries following information：The identification information of UE, signaling connection
Establish reason and Target Cell Identifier number；Information establishes RRC companies to the wireless link module for the UE in accordance with the above
Connect, for the Radio Resource of the UE assignment signallings and CS voice services, and initiate to base station for the UE to establish Radio Link process.
14. wireless controller as claimed in claim 12, it is characterised in that：
The resource information includes：The radio bearer information of signaling and CS voice services, the transmission letter of signaling and CS voice services
Road information, and physic channel information.
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| WO2015066843A1 (en) * | 2013-11-05 | 2015-05-14 | 华为技术有限公司 | Call control method and apparatus |
| CN105228207B (en) * | 2014-05-27 | 2019-06-21 | 中国移动通信集团浙江有限公司 | A kind of method and device for verifying LTE network circuit domain dropping CSFB functional configuration |
| CN105530674A (en) * | 2014-10-23 | 2016-04-27 | 中兴通讯股份有限公司 | Circuit domain fallback method and communication node and system |
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| CN101964965A (en) * | 2009-07-23 | 2011-02-02 | 华为技术有限公司 | Method, device and system for returning voice call to circuit switching domain |
| CN102045805A (en) * | 2009-10-16 | 2011-05-04 | 中兴通讯股份有限公司 | System and method for implementing circuit switched fallback service of evolved packet system |
| CN102238674A (en) * | 2010-04-30 | 2011-11-09 | 电信科学技术研究院 | Service switching method and equipment from PS (Packet Switched) domain to 2G/3G network |
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| CN101489288B (en) * | 2008-01-16 | 2011-04-20 | 华为技术有限公司 | Circuit domain service processing method, system and related device in evolution packet network |
| CN102045803B (en) * | 2009-10-17 | 2013-06-12 | 中兴通讯股份有限公司 | System and method for implementing circuit switched fallback of evolved packet system network |
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| CN101964965A (en) * | 2009-07-23 | 2011-02-02 | 华为技术有限公司 | Method, device and system for returning voice call to circuit switching domain |
| CN102045805A (en) * | 2009-10-16 | 2011-05-04 | 中兴通讯股份有限公司 | System and method for implementing circuit switched fallback service of evolved packet system |
| CN102238674A (en) * | 2010-04-30 | 2011-11-09 | 电信科学技术研究院 | Service switching method and equipment from PS (Packet Switched) domain to 2G/3G network |
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