CN109041149A - Method for switching network and device - Google Patents
Method for switching network and device Download PDFInfo
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- CN109041149A CN109041149A CN201811050349.0A CN201811050349A CN109041149A CN 109041149 A CN109041149 A CN 109041149A CN 201811050349 A CN201811050349 A CN 201811050349A CN 109041149 A CN109041149 A CN 109041149A
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/56—Provisioning of proxy services
- H04L67/59—Providing operational support to end devices by off-loading in the network or by emulation, e.g. when they are unavailable
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/14—Session management
- H04L67/141—Setup of application sessions
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
- H04W36/00224—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]
- H04W36/00226—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB] wherein the core network technologies comprise IP multimedia system [IMS], e.g. single radio voice call continuity [SRVCC]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/14—Reselecting a network or an air interface
- H04W36/144—Reselecting a network or an air interface over a different radio air interface technology
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/12—Setup of transport tunnels
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
This application discloses a kind of method for switching network and devices, for solving the problems, such as that terminal device can not carry out IMS voice service.This method comprises: the first access network equipment receives the first session management information from session management network element, the first session management information is used to request to establish user face tunnel for the voice service of terminal device；First access network equipment sends switching request to first movement managed network element according to the first session management information and first condition, switching request is used to terminal device switching to the second network from first network, and first condition includes: that first network can not carry out voice service.The application is suitable for field of communication technology.
Description
Technical field
This application involves field of communication technology more particularly to a kind of method for switching network and device.
Background technique
At present, on the one hand, many operators there is no or be not intended at the 5th generation (fifth-generation, abbreviation 5G)
Wireless communication system disposes internet protocol multi-media sub-system (internet protocol multimedia
Subsystem, abbreviation IMS) voice service, on the other hand, the frequency spectrum in 5G network is in high band, high-frequency signal covering mostly
Range is small, and the range of IMS voice service requirement signal covering is bigger, can not so as to cause the terminal device in 5G network
Carry out IMS voice service.
Summary of the invention
The embodiment of the present application provides a kind of method for switching network and device, can not carry out IMS for solving terminal device
The problem of voice service.
In order to achieve the above objectives, the embodiment of the present application provides the following technical solutions:
In a first aspect, providing a kind of method for switching network, comprising: the first access network equipment, which receives, comes from session management net
First session management information of member, the first session management information are used to request to establish user face tunnel for the voice service of terminal device
Road；First access network equipment sends switching to first movement managed network element according to the first session management information and first condition and asks
It asks, switching request is used to terminal device switching to the second network from first network, and first condition includes: that first network can not be into
Row voice service.
The method that first aspect provides can be by will be whole when the terminal device in first network carries out voice service
End equipment switches to the second network, so that terminal device can carry out voice service in the second network, solves the first net
The problem of terminal device in network can not carry out voice service.
In a kind of possible design, first condition further include: the signal of the second networks support both voice business, the second network
Quality meets the network equipment of voice service demand and first network and terminal device is supported between first network and the second network
At least one of switching.
In a kind of possible design, this method further include: the first access network equipment sends second to session management network element
Session management information, the second session management information include that received information is established in the user face tunnel of voice service.This kind
Possible design, the network element in first network can establish user face tunnel for the voice service of terminal device.
In a kind of possible design, the second session management information is sent to session management network element in the first access network equipment
Before, this method further include: the first access network equipment determines not to be voice industry according to the first session management information and first condition
The user face tunnel distributing radio resource of business.This kind of possible design, the network element in first network can be the voice of terminal device
Business establishes user face tunnel.
In a kind of possible design, this method further include: the first access network equipment sends third to session management network element
Session management information, third session management information include the information that the foundation in the user face tunnel of voice service is rejected.This kind
Possible design, after terminal device is completed from first network to the switching of the second network, the network element in the second network can be for eventually
User face tunnel is established in the voice service of end equipment.
In a kind of possible design, the information that the foundation in the user face tunnel of voice service is rejected includes the original of refusal
Because of information.This kind of possible design, after terminal device is completed from first network to the switching of the second network, in the second network
Network element can establish user face tunnel for the voice service of terminal device.
In a kind of possible design, cause information are as follows: terminal device is executing switching flow.This kind of possible design,
After terminal device is completed from first network to the switching of the second network, the network element in the second network can be the voice of terminal device
Business establishes user face tunnel.
In a kind of possible design, first condition further include: the second network can not carry out voice service, and this method is also wrapped
Include: the first access network equipment sends the 4th session management information to session management network element, and the 4th session management information includes voice
The information that the foundation in the user face tunnel of business is rejected, the information that the foundation in the user face tunnel of voice service is rejected include
Radio resource is insufficient.This kind of possible design, after terminal device is completed from first network to the switching of the second network, the second net
Network element in network will not establish user face tunnel for the voice service of terminal device.
Second aspect provides a kind of method for switching network, comprising: session management network element receives the first access network equipment hair
The third session management information sent, third session management information include the foundation in the user face tunnel of the voice service of terminal device
The reason of being rejected information；Session management network element determines that terminal device switches to the second network from first network；Session management net
Member is that user face tunnel is established in voice service in the second network according to cause information.
The method that second aspect provides, when the terminal device in first network switches to the second network, meeting from first network
Words managed network element is that user face tunnel is established in voice service in the second network according to cause information, if the second network can carry out language
Sound business, then user face tunnel can establish success, so that terminal device can carry out voice service in the second network,
Solve the problems, such as that the terminal device in first network can not carry out voice service.
In a kind of possible design, cause information are as follows: terminal device is executing switching flow.
In a kind of possible design, session management network element is that use is established in voice service in the second network according to cause information
Family face tunnel, comprising: session management network element is according to cause information and second condition in the second network after the first preset time period
User face tunnel is established for voice service, second condition includes that the second network can not carry out voice service.This kind of possible design,
Combined registering, which is completed, for terminal device has reserved the first preset time period, by the reasonable setting to the first preset time period,
Terminal device can be made to complete combined registering and then initiate CSFB calling, to guarantee that terminal device is successfully initiated
CSFB calling.
In a kind of possible design, session management network element is according to cause information and second condition in the first preset time period
It is afterwards that user face tunnel is established in voice service in the second network, comprising: session management network element is according to cause information and second condition
Tunnel is sent to the gateway of the second network after the first preset time period and establishes request, and tunnel is established request and built for requesting
The user face tunnel of vertical voice service.
In a kind of possible design, session management network element according to by cause information and second condition in the first preset time
It in the second network is that user face tunnel is established in voice service after section, comprising: session management network element is according to cause information to the second net
The gateway of network sends tunnel and establishes request, and tunnel establishes request and establishes voice service user face tunnel for requesting；Session
Managed network element receives the tunnel that gateway is sent and establishes response, includes the user face tunnel of voice service in tunnel foundation response
Establish the information being rejected；Session management network element controls network element to policing feature after the first preset time period according to second condition
First message is sent, failure is established in the user face tunnel that first message is used to indicate voice service.
The third aspect provides a kind of method for switching network, comprising: the second mobile management network element receives gateway hair
Request is established in the tunnel sent, and user face tunnel of the request for requesting to establish voice service for terminal device is established in tunnel；Second
Mobile management network element sends tunnel to gateway according to second condition and establishes response, and it includes terminal device that response is established in tunnel
The user face tunnel of voice service establish the information that is rejected, second condition includes that the second network can not carry out voice service.
The method that the third aspect provides, the second mobile management network element is when the second network can not carry out voice service to clothes
Business gateway sends tunnel and establishes response, so that the information being rejected is established in user face tunnel by gateway is transferred to IMS net
Network, so that the CSFB business of IMS network triggering terminal equipment, so that terminal device carries out CS voice service.
In a kind of possible design, second condition further include: terminal device is to switch to the second network from first network
Terminal device.
In a kind of possible design, the second mobile management network element sends tunnel to gateway according to second condition and builds
Before vertical response, this method further include: the second mobile management network element determines that terminal device completes combined registering.This kind of possibility
Design can guarantee terminal device successfully initiate CSFB calling.
In a kind of possible design, the second mobile management network element determines that terminal device completes combined registering, comprising:
Second mobile management network element determines that receiving the combined registering from terminal device completes message.
Fourth aspect provides a kind of method for switching network, comprising: the second mobile management network element is set to the second access net
Preparation send wireless tunnel to establish request, and wireless tunnel establishes request for requesting the voice service for terminal device to establish user face
Tunnel；Second mobile management network element receives the wireless tunnel that the second access network equipment is sent and establishes response, and wireless tunnel is established
Response includes that the information being rejected is established in the user face tunnel of the voice service of terminal device；Second mobile management network element according to
Second condition sends tunnel to gateway and establishes response, and the user face that response includes the voice service of terminal device is established in tunnel
The information being rejected is established in tunnel, and second condition includes that the second network can not carry out voice service.
The information that is rejected is established to clothes in user face tunnel by the method that fourth aspect provides, the second mobile management network element
Gateway of being engaged in is sent so that the information that is rejected is established in user face tunnel by gateway is transferred to IMS network, so as to so that
The CSFB business of IMS network triggering terminal equipment is obtained, so that terminal device carries out CS voice service.
In a kind of possible design, second condition further include: terminal device is to switch to the second network from first network
Terminal device.
In a kind of possible design, the second mobile management network element sends tunnel to gateway according to second condition and builds
Vertical response, comprising: the second mobile management network element determines that second condition is set up and terminal device completes combined registering；Second is mobile
Property managed network element to gateway send tunnel establish response.This kind of possible design can guarantee that terminal device is successfully initiated
CSFB calling.
In a kind of possible design, the second mobile management network element determines that terminal device completes combined registering, comprising: the
Two mobile management network elements determine that receiving the registration from terminal device completes message.
5th aspect, provides a kind of method for switching network, comprising: the second mobile management network element receives gateway hair
Request is established in the tunnel sent, and user face tunnel of the request for requesting to establish voice service for user equipment terminal device is established in tunnel
Road；If second condition is set up, the second mobile management network element determines that terminal device completes combined registering, and second condition includes second
Network can not carry out voice service；Second mobile management network element sends wireless tunnel to the second access network equipment and establishes request,
Wireless tunnel establishes request for requesting the voice service for terminal device to establish user face tunnel；Second mobile management network element
The wireless tunnel for receiving the transmission of the second access network equipment establishes response, and wireless tunnel establishes the voice industry that response includes terminal device
The information being rejected is established in the user face tunnel of business；Second mobile management network element establishes response to service network according to wireless tunnel
It closes and sends tunnel foundation response, what the user face tunnel foundation that the voice service that response includes terminal device is established in tunnel was rejected
Information.
The method that 5th aspect provides, the second mobile management network element determine user after terminal device completes combined registering
Face tunnel is established the information being rejected and is sent to gateway, so that the letter being rejected is established in user face tunnel by gateway
Breath is transferred to IMS network so that the CSFB business of IMS network triggering terminal equipment so that terminal device into
Row CS voice service, it can also be ensured that terminal device successfully initiates CSFB calling.
In a kind of possible design, second condition further include: terminal device is to switch to the second network from first network
Terminal device.
In a kind of possible design, the second mobile management network element determines that terminal device completes combined registering, comprising: the
Two mobile management network elements determine that message is completed in the registration for receiving terminal device transmission.
6th aspect, provides a kind of method for switching network, comprising: the second access network equipment receives the second mobile management
The wireless tunnel that network element is sent establishes request, and wireless tunnel establishes request for requesting the second access network equipment to be built for terminal device
The user face tunnel of vertical voice service；Second access network equipment sends according to second condition to the second mobile management network element wireless
Response is established in tunnel, and it includes that the information being rejected, Article 2 are established in the user face tunnel of voice service that wireless tunnel, which establishes response,
Part includes that the second network can not carry out voice service.
The method that 6th aspect provides, the second access network equipment are refused to use when the second network can not carry out voice service
Family face tunnel distributing radio resource, and the user face tunnel of voice service is established to the information carrying being rejected and is built in wireless tunnel
It is sent in vertical response to the second mobile management network element, user face tunnel can be established and is rejected by the second mobile management network element
Information pass to IMS network so that the CSFB business of IMS network triggering terminal equipment so that terminal device into
Row CS voice service.
In a kind of possible design, second condition further include: terminal device is to switch to the second network from first network
Terminal device.
7th aspect, provides a kind of method for switching network, comprising: IMS network element is received as terminal device and establishes in ps domain
The request message of voice service；The determination of IMS network element can not establish voice service in the ps domain of first network or the second network；IMS
Network element determines that terminal device completes combined registering；The CSFB business of IMS network element triggering terminal equipment.
The method that 7th aspect provides, IMS network element can not establish language in the ps domain of first network or the second network in determination
When sound business and terminal device completion combined registering, the CSFB business of triggering terminal equipment, since terminal device is completed to combine
Registration is the necessary condition that terminal device initiates CSFB calling, and therefore, the method that the 7th aspect provides can also guarantee that terminal is set
It is standby successfully to initiate CSFB calling, so that terminal device carries out CS voice service.
In a kind of possible design, terminal device is received as in IMS network element and is disappeared in the request that ps domain establishes voice service
After breath, this method further include: IMS network element determines that terminal device is registered in first network.
In a kind of possible design, the determination of IMS network element can not establish voice in the ps domain of first network or the second network
Business, comprising: IMS network element obtains the voice service from first network ps domain and establishes failure information；Come or, IMS network element obtains
Failure information is established from the voice service of the second network PS field.
In a kind of possible design, IMS network element determines that terminal device completes combined registering, comprising: IMS network element determines nothing
For method after the second preset time period that the ps domain of first network or the second network establishes that voice service rises, IMS network element determines terminal
Equipment completes combined registering；Alternatively, IMS network element is according to the terminal device obtained from policy control network element or home subscriber server
Registered location information, determine terminal device complete combined registering.
In a kind of possible design, terminal device is the calling terminal equipment of voice service, and IMS network element triggering terminal is set
Standby CSFB business, comprising: IMS network element sends second message to calling terminal equipment, and second message is for triggering calling terminal
Equipment initiates CSFB calling service.
In a kind of possible design, terminal device is the called terminal equipment of voice service, and IMS network element triggering terminal is set
Standby CSFB business, comprising: IMS network element sends third message to called domain optional equipment, and third message is used to indicate in the first net
The called voice service of the ps domain of network or the second network establishes failure, so that called domain optional equipment triggering called terminal equipment
CSFB called voice service.
Eighth aspect provides a kind of method for switching network, comprising: the second mobile management network element receives first movement
The 4th message that managed network element is sent, the 4th message is for confirming that terminal device completes reorientation；Second mobile management network element
Tunnel modification request is sent to gateway according to second condition, the voice service for modifying terminal device is requested in tunnel modification
Signaling plane tunnel information, second condition include the second network can not carry out voice service.
Eighth aspect provide method, when the second network can not carry out voice service, the second mobile management network element to
Gateway sends tunnel modification request, and tunnel can be modified request and be forwarded to session management network element by gateway, due to session
Managed network element can be just sent to terminal device and exhale for triggering terminal equipment initiation CSFB after receiving tunnel modification request
The message (second message i.e. hereinafter) cried, therefore, the method that eighth aspect provides can not carry out language in the second network
Triggering terminal equipment initiates CSFB calling when sound business, so that terminal device carries out CS voice service.
In a kind of possible design, the second mobile management network element sends tunnel to gateway according to second condition and repairs
Change request, comprising: the second mobile management network element determines that second condition is set up and UE completes combined registering；Second mobile management
Network element sends tunnel modification request to gateway.This kind of possible design can guarantee that terminal device is successfully initiated CSFB and exhaled
It cries.
9th aspect, provides a kind of network registering method, this method comprises: first movement managed network element is set from terminal
Standby to receive registration request, terminal device is registered in first network for requesting by registration request；If third condition is set up, first is moved
Mobility management network element sends the first instruction information to terminal device, and the voice service that the first instruction information is used to indicate ps domain is propped up
It holds, third condition includes: that first network is supported terminal device being moved to the second network.The method that 9th aspect provides, no matter
Whether first network supports the voice service of terminal device, leads to as long as first network has when terminal device initiates voice service
Switching or other modes are crossed to fall the terminal device to the ability for the network that can provide voice service after rise, then the terminal device to
When first network is registered, the voice service of first movement managed network element just instruction terminal equipment ps domain is supported, to guarantee
Terminal device, which is registered and resides in first network, saves Internet resources without reselecting to other networks, and guarantees terminal device
Ps domain voice service register flow path is normally executed by first network and initiates ps domain audio call process.
In a kind of possible design, the core net of first network and the second network is identical, and access standard is different；Alternatively,
The core net of first network and the second network and access standard are different.
In a kind of possible design, first network is supported terminal device being moved to the second network, comprising: first network
In the first access network equipment support when receiving from the first session management information of session management network element, by terminal device
The second network is accessed, the first session management information is used to request to establish user face tunnel for the voice service of terminal device.
In a kind of possible design, third condition further include: switching mutually behaviour is supported between first network and the second network
Make, and, the second network can support at least one of voice service of ps domain.
Switching interoperability is supported in a kind of possible design, between first network and the second network, comprising: first network
And second have switching interworkng interface between network.
In a kind of possible design, first movement managed network element to terminal device send first instruction information it
Before, the method also includes: first movement managed network element determines that terminal device is the terminal device based on voice service.By
It is unrelated with voice service in the terminal device based on data service, the optional method can with distinguishing terminal type, for
Terminal device based on data service does not need to execute this sets of plan, that is, does not need to determine whether third condition is true, not yet
Need to send the first instruction information.
In a kind of possible design, carried terminal equipment is the terminal device based on voice service in registration request
Indicate information, first movement managed network element determines that terminal device is the terminal device based on voice service, comprising: first moves
Mobility management network element determines that terminal device is the terminal device based on voice service according to registration request.
In a kind of possible design, first movement managed network element to terminal device send first instruction information it
Before, this method further include: first movement managed network element determines that terminal device is supported during voice service is initiated from first
Network Mobility continues the initiation process of voice service to the second network and by the second network.Due to only having terminal device to support
Voice service is moved to the second network from first network during initiating and continues the initiation of voice service by the second network
In the case where journey, the method that first aspect provides just be can be implemented, and therefore, can determine the information in advance, avoid influence can not
It supports to be moved to the second network from first network during voice service is initiated and voice service is continued by the second network
The terminal device of initiation process.
In a kind of possible design, gone back in registration request carried terminal equipment support voice service initiate during from
First network is moved to the second network and continues the instruction information of the initiation process of voice service, first movement by the second network
Property managed network element determine that terminal device is supported to be moved to the second network during voice service is initiated from first network and pass through
The initiation process of second network continuation voice service, comprising: first movement managed network element determines that terminal is set according to registration request
It is standby to support to be moved to the second network from first network during voice service is initiated and voice service is continued by the second network
Initiation process.
Tenth aspect, provides a kind of network registering method, this method comprises: terminal device generates registration request, registration
Terminal device is registered in first network for requesting by request, and carried terminal equipment is based on voice service in registration request
The instruction information of terminal device；Terminal device sends registration request to first movement managed network element.
In a kind of possible design, further include in registration request terminal device support voice service initiate during from
First network is moved to the second network and continues the instruction information of the initiation process of voice service by the second network.
In a kind of possible design, the core net of first network and the second network is identical, and access standard is different；Alternatively,
The core net of first network and the second network and access standard are different.
On the one hand tenth, provides a kind of network equipment, which can be the first access network equipment, session management
Network element, the second mobile management network element, the second access network equipment, IMS network element or first movement managed network element, when the network is set
When for being the first access network equipment, which has the function of realizing any one method that first aspect provides；When this
When the network equipment is session management network element, which has the function of realizing any one method that second aspect provides；
When the network equipment is the second mobile management network element, which, which has, realizes the third aspect, fourth aspect, the 5th side
The function for any one method that face or eighth aspect provide；When the network equipment is the second access network equipment, which is set
Standby any one method for having the function of realizing that the 6th aspect provides；When the network equipment is IMS network element, the network equipment
Have the function of realizing any one method that the 7th aspect provides；When the network equipment is first movement managed network element,
The network equipment has the function of realizing any one method that the 9th aspect provides.The function that the network equipment is realized can pass through
Hardware realization can also execute corresponding software realization by hardware.The hardware or software include one or more and above-mentioned side
The corresponding functional unit of method.
12nd aspect, provides a kind of terminal device, which, which has, realizes any one of the tenth aspect offer
The function of kind method, the function that terminal device is realized can also execute corresponding software by hardware realization by hardware
It realizes.The hardware or software include one or more functional units corresponding with the methods of the tenth aspect offer.
13rd aspect provides a kind of network equipment, comprising: memory, processor and communication interface；Memory is used for
Computer executed instructions are stored, processor executes the computer executed instructions of memory storage, and makes net by communication interface
Network equipment realizes the method that above-mentioned aspect provides, specifically, the network equipment can be the first access network equipment, session management net
Member, the second mobile management network element, the second access network equipment, IMS network element or first movement managed network element, when the network equipment
When for the first access network equipment, which may be implemented any one method of first aspect offer；When the network equipment
When for session management network element, which may be implemented any one method of second aspect offer；When the network equipment is
When the second mobile management network element, which may be implemented the third aspect, fourth aspect, the 5th aspect or eighth aspect and mentions
Any one method supplied；When the network equipment is the second access network equipment, which may be implemented the 6th aspect and mentions
Any one method supplied；When the network equipment is IMS network element, which may be implemented any of the 7th aspect offer
A kind of method；When the network equipment is first movement managed network element, which, which has, realizes what the 9th aspect provided
The function of any one method.
Fourteenth aspect provides a kind of terminal device, comprising: memory, processor and communication interface；Memory is used for
Computer executed instructions are stored, processor executes the computer executed instructions of memory storage, and makes end by communication interface
End equipment realizes any one method that the tenth aspect provides.
15th aspect provides a kind of computer readable storage medium, including instruction, when it runs on computers
When, so that computer executes any one method that first aspect provides.
16th aspect provides a kind of computer readable storage medium, including instruction, when it runs on computers
When, so that computer executes any one method that second aspect provides.
17th aspect provides a kind of computer readable storage medium, including instruction, when it runs on computers
When, so that computer executes any one method that the third aspect provides.
18th aspect provides a kind of computer readable storage medium, including instruction, when it runs on computers
When, so that computer executes any one method that fourth aspect provides.
19th aspect provides a kind of computer readable storage medium, including instruction, when it runs on computers
When, so that computer executes any one method that the 5th aspect provides.
20th aspect provides a kind of computer readable storage medium, including instruction, when it runs on computers
When, so that computer executes any one method that the 6th aspect provides.
20th on the one hand, a kind of computer readable storage medium, including instruction is provided, when it runs on computers
When, so that computer executes any one method that the 7th aspect provides.
22nd aspect provides a kind of computer readable storage medium, including instruction, when it runs on computers
When, so that computer executes any one method that eighth aspect provides.
23rd aspect provides a kind of computer readable storage medium, including instruction, when it runs on computers
When, so that computer executes any one method that the 9th aspect provides.
Twenty-fourth aspect provides a kind of computer readable storage medium, including instruction, when it runs on computers
When, so that computer executes any one method that the tenth aspect provides.
25th aspect, provides a kind of computer program product comprising instruction, when run on a computer,
So that computer executes any one method that first aspect provides.
26th aspect, provides a kind of computer program product comprising instruction, when run on a computer,
So that computer executes any one method that second aspect provides.
27th aspect, provides a kind of computer program product comprising instruction, when run on a computer,
So that computer executes any one method that the third aspect provides.
Twenty-eighth aspect provides a kind of computer program product comprising instruction, when run on a computer,
So that computer executes any one method that fourth aspect provides.
29th aspect, provides a kind of computer program product comprising instruction, when run on a computer,
So that computer executes any one method that the 5th aspect provides.
30th aspect, provide a kind of computer program product comprising instruction makes when run on a computer
It obtains computer and executes any one method that the 6th aspect provides.
On the one hand 30th, provides a kind of computer program product comprising instruction, when run on a computer,
So that computer executes any one method that the 7th aspect provides.
32nd aspect, provides a kind of computer program product comprising instruction, when run on a computer,
So that computer executes any one method that eighth aspect provides.
33rd aspect, provides a kind of computer program product comprising instruction, when run on a computer,
So that computer executes any one method that the 9th aspect provides.
34th aspect, provides a kind of computer program product comprising instruction, when run on a computer,
So that computer executes any one method that the tenth aspect provides.
Tenth one side technical effect brought by any design method into the 34th aspect can be found in first party
Face technical effect brought by different designs mode into the tenth aspect, details are not described herein again.
Detailed description of the invention
Fig. 1 is a kind of configuration diagram of 5G network provided by the embodiments of the present application；
Figure 1A is the schematic diagram that a kind of terminal device provided by the embodiments of the present application accesses 5G CN；
Fig. 2 is a kind of configuration diagram of EPS network provided by the embodiments of the present application；
Fig. 3 is the network architecture schematic diagram after 5G network provided by the embodiments of the present application and EPS Network integration；
Fig. 4 is the communication scheme of EPS network and IMS network provided by the embodiments of the present application；
Fig. 5 carries out the schematic diagram of IMS voice communication between terminal device provided by the embodiments of the present application；
Fig. 6 is a kind of composition schematic diagram of the network equipment provided by the embodiments of the present application；
Fig. 6 A is a kind of composition schematic diagram of terminal device provided by the embodiments of the present application；
Fig. 7 is a kind of interaction diagrams of method for switching network provided by the embodiments of the present application；
Fig. 8 and Fig. 9 is respectively a kind of process flow diagram flow chart of network switching provided by the embodiments of the present application；
Figure 10-Figure 12 is respectively the process schematic that a kind of user face tunnel provided by the embodiments of the present application is established；
Figure 13-Figure 17 is respectively a kind of side for guaranteeing terminal device and successfully initiating CSFB calling provided by the embodiments of the present application
Method schematic diagram；
Figure 18-Figure 28 is respectively a kind of interaction diagrams of method for switching network provided by the embodiments of the present application；
Figure 28 A is a kind of flow chart of network registering method provided by the embodiments of the present application；
Figure 28 B is the flow chart of another network registering method provided by the embodiments of the present application；
Figure 29 is a kind of schematic diagram of the network equipment provided by the embodiments of the present application；
Figure 29 A is a kind of schematic diagram of terminal device provided by the embodiments of the present application.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application is described.Its
In, in the description of the present application, unless otherwise indicated, "/" indicate or the meaning, for example, A/B can indicate A or B；Herein
"and/or" be only a kind of incidence relation for describing affiliated partner, indicate may exist three kinds of relationships, for example, A and/or B,
Can indicate: individualism A exists simultaneously A and B, these three situations of individualism B.In addition, in the description of the present application, it is " more
It is a " refer to two or more.
Method provided by the embodiments of the present application can be applied to wireless communication system, such as: global mobile communication (global
System of mobile communication, abbreviation GSM) system, CDMA (code division multiple
Access, abbreviation CDMA) system, wideband code division multiple access (wideband code division multiple access
Wireless, abbreviation WCDMA) system, General Packet Radio Service (general packet radio service, referred to as
GPRS) system, and Universal Mobile Communication System (universal mobile melecommunications system, referred to as
UMTS), EPS network and 5G network can be also used for following wireless communication system.
Specifically, method provided by the embodiments of the present application can be applied to 5G network shown in FIG. 1, as shown in Figure 1, the 5G
Network may include: authentication server function (authentication server function, abbreviation AUSF) network element, access
With mobile management function (mobility management function, abbreviation AMF) network element, data network (data
Network, abbreviation DN), uniform data management (unified data management, abbreviation UDM) network element, policy control function
It can (policy control function, abbreviation PCF) network element, (wireless) access net ((radio) access network, letter
Claim (R) AN) equipment, user plane functions (user plane function, abbreviation UPF) network element, terminal device, application function
(application function, abbreviation AF) network element, conversation management functional (session management function, letter
Claim SMF) network element.
Wherein, (R) AN equipment of 5G network can be next-generation (next generation, abbreviation NG) RAN equipment,
It can be Evolved UTRAN (evolved universal terrestrial radio access
Network, abbreviation E-UTRAN) equipment, 5G network can be connected to above two access network equipment simultaneously namely 5G network may
It is provided simultaneously with two kinds of different radio accesses standard (radio access type, abbreviation RAT).Referring to Figure 1A, terminal device can be with
By E-UTRAN equipment or NG RAN equipment access 5G core net (core network, abbreviation CN), the embodiment of the present application is with end
End equipment is registered in 5G network by NG RAN and implements for initiating voice service under NG RAN accesses standard to the application
The method that example provides illustrates.
Control plane (control plane, abbreviation CP) functional network element includes: UDM network element, AUSF network element, PCF network element, AMF
Network element and SMF network element.
Specifically, (R) AN equipment major function includes: offer wireless connection；UPF network element major function includes: to make data
Packet routing and forwarding, mobility anchor, uplink classifier support more ownership packet datas to support routing service to flow to DN, BP
Unit (packet data unit, abbreviation PDU) session etc.；DN can be carrier service, linking Internet or third party
Service；AMF network element major function includes managing users registration, accessible detecting, the selection of SMF node, moving condition crossover connection
Reason etc.；SMF network element major function includes: to control foundation, modification and the deletion of session, the selection etc. of user face nodes；PCF network element
Major function includes: policy decision point, is provided based on business data flow and application detection, gate, service quality (quality of
Service, abbreviation QoS) and charging control based on stream etc. it is regular；AF network element major function includes: and third generation affiliate
Plan the interaction of (3rd generation partnership project, abbreviation 3GPP) core net to provide service, to influence
Business Stream routing, access net ability opening, policy control etc.；AUSF network element major function includes: offer authentication service；UDM net
First major function includes: storing user subscription data.
Wherein, terminal device is referred to as user equipment (user equipment, abbreviation UE), access terminal, user
Unit, subscriber station, movement station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication are set
Standby, user agent or user apparatus.Terminal device can also be WLAN (wireless local area
Networks, abbreviation WLAN) in website (station, abbreviation ST), can be cellular phone, wireless phone, session initiation association
Discuss (session initiation protocol, abbreviation SIP) phone, wireless local loop (wireless local loop,
Abbreviation WLL) it stands, personal digital assistant (personal digital assistant, abbreviation PDA) equipment, there is wireless communication
The handheld device of function, mobile unit, wearable is set the other processing equipments for calculating equipment or being connected to radio modem
Standby (being referred to as wearable intelligent equipment).Terminal device can also be the terminal device in next generation communication system, for example,
Public land mobile network (public land mobile network, the abbreviation of terminal device or the following evolution in 5G
PLMN the terminal device in), the terminal device etc. in new wireless (new radio, abbreviation NR) communication system.
Specifically, method provided by the embodiments of the present application can also be applied to evolved packet system shown in Fig. 2
(evolved packet system, abbreviation EPS) network (i.e. usually said 4G network), as shown in Fig. 2, the EPS network can
To include following multiple functional network elements: terminal device, E-UTRAN (being specifically as follows eNodeB), Service Gateway (serving
Gateway, abbreviation SGW), packet data gateway (packet data network gateway, abbreviation PGW), mobile management
Network element (mobility management entity, abbreviation MME), home subscriber server (home subscriber
Server, abbreviation HSS), mobile switching centre (mobile switching center, abbreviation MSC) and strategy and charging regulation
Function (policy and charging rules function, abbreviation PCRF) network element.
It, can be by the functional network element and EPS network in 5G network in the case where not only disposing 5G network but also disposing EPS network
In functional network element integrated, 5G network and EPS network are interacted, referring to Fig. 3, in the network after integration
Functional network element include: HSS+UDM functional network element (referring to both have the function of HSS but also with the functional network element of the function of UDM),
PCF+PCRF functional network element (referring to both have the function of PCF but also with the functional network element of the function of PCRF), SMF+PGW-C function
Network element (refers to the function of both having SMF but also with packet data network gateway-control plane (packet data network
Gateway-control plane, abbreviation PGW-C) function functional network element), UPF+PGW-U functional network element (refers to both and has
The function of standby UPF is but also with packet data network gateway-user face (packet data network gateway-user
Plane, abbreviation PGW-U) function functional network element), SGW, MME, E-UTRAN, AMF, NGRAN and terminal device.In this Shen
Please in each embodiment in, HSS+UDM functional network element, PCF+PCRF functional network element, SMF+PGW-C functional network element, UPF+PGW-U
It is merely illustrative, each network element is also possible to be separated from each other two network elements, it is not limited here.
The voice service scheme of comparative maturity includes in the IMS voice service scheme and 2G/3G network in EPS network at present
Circuit switching (circuit switching, abbreviation CS) voice service scheme.Since 5G network is not supported in the prior art
IMS and CS voice service, the embodiment of the present application provide a kind of method for switching network, and terminal device is allowed to need to carry out
When voice service, voice service is carried out from 5G network switching to EPS network or 2G/3G network.
Referring to fig. 2, if the IP operation of operator is IMS voice service, the communication scheme of EPS network and IMS network
It may refer to Fig. 4, wherein IMS network includes: Proxy-Call Session Control Function (Proxy-Call Session Control
Funtion, abbreviation P-CSCF)/session Edge position control (Session Border Control, abbreviation SBC), query call session
Control function (interrogating-call session control funtion, abbreviation I-CSCF)/service call session
Control function (serving-call session control funtion, abbreviation S-CSCF), telco application server
(telephony application server, abbreviation TAS) and IMS Media Gateway (IMS media gateway, abbreviation IMS
MGW), wherein select functional module (terminating access domain selection, abbreviation T-ADS) can be in called domain
It is comprised in TAS, therefore, called domain optional equipment hereinafter may be considered TAS.TAS may be service set and company
Continuous property application server (service centralization and continuity application server, abbreviation
SCC AS)。
Terminal device is when carrying out IMS voice service, the process of calling terminal equipment and called terminal communication between devices
May refer to Fig. 5, specifically include: information relevant to calling is accessed net to caller and sent by calling terminal equipment, with calling phase
The information of pass is by caller access net, caller core net, caller IMS network, called IMS network, called core net and called connects
Called terminal equipment is reached after networking, the information that called terminal equipment is fed back to calling terminal equipment is sent in opposite directions
?.
It should include extremely as shown in fig. 6, being a kind of hardware structural diagram of the network equipment 60 provided by the embodiments of the present application
A few processor 601, communication bus 602, memory 603 and at least one communication interface 604.The network equipment 60 can be with
It is the first access network equipment in the application or the second access network equipment or first movement managed network element or the second mobility
Managed network element or session management network element or IMS network element or user plane gateway or gateway.
Processor 601 can be a general central processor (central processing unit, abbreviation CPU), micro-
Processor, application-specific integrated circuit (application-specific integrated circuit, abbreviation ASIC), or
One or more is for controlling the integrated circuit of application scheme program execution.
Communication bus 602 may include an access, and information is transmitted between said modules.
Communication interface 604, using the device of any transceiver one kind, for other equipment or communication, such as
Ethernet, wireless access network (radio access network, abbreviation RAN), WLAN (wireless local
Area networks, abbreviation WLAN) etc..
Memory 603 can be read-only memory (read-only memory, abbreviation ROM) or can store static information and
Instruction other kinds of static storage device, random access memory (random access memory, abbreviation RAM) or
The other kinds of dynamic memory that information and instruction can be stored, is also possible to Electrically Erasable Programmable Read-Only Memory
(electrically erasable programmable read-only memory, abbreviation EEPROM), CD-ROM
(compact disc read-only memory, abbreviation CD-ROM) or other optical disc storages, optical disc storage (including squeezed light
Dish, laser disc, optical disc, Digital Versatile Disc, Blu-ray Disc etc.), magnetic disk storage medium or other magnetic storage apparatus or energy
Be enough in carrying or storage have instruction or data structure form desired program code and can by computer access times
What his medium, but not limited to this.Memory, which can be, to be individually present, and is connected by bus with processor.Memory can also
To be integrated with processor.
Wherein, memory 603 is used to store the application code for executing application scheme, and is controlled by processor 601
System executes.Processor 601 is for executing the application code stored in memory 603, thus side described in realization hereafter
Method.
In the concrete realization, as one embodiment, processor 601 may include one or more CPU, such as in Fig. 6
CPU0 and CPU1.
In the concrete realization, as one embodiment, the network equipment 60 may include multiple processors, such as in Fig. 6
Processor 601 and processor 608.Each of these processors can be monokaryon (single-CPU) processor,
It can be multicore (multi-CPU) processor.Here processor can refer to one or more equipment, circuit, and/or use
In the processing core of processing data (such as computer program instructions).
In the concrete realization, as one embodiment, the network equipment 60 can also include output equipment 605 and input equipment
606.Output equipment 605 and processor 601 communicate, and can show information in many ways.
It as shown in Figure 6A, is a kind of hardware structural diagram of terminal device 60A provided by the embodiments of the present application, the terminal
Equipment 60A includes at least one processor 601A, communication bus 602A, memory 603A and at least one communication interface
604A。
In the concrete realization, as one embodiment, processor 601A may include one or more CPU, such as Fig. 6 A
In CPU0 and CPU1.
In the concrete realization, as one embodiment, terminal device 60A may include multiple processors, such as Fig. 6 A
In processor 601A and processor 608A.
In the concrete realization, as one embodiment, terminal device 60A can also include output equipment 605A and input
Equipment 606A.The effect of each device shown in Fig. 6 A and other explanation property of can be exemplified are seen above.
In the embodiment of the present application, first network and the second network, which can be, refers to the accession to that standard is different and core net is also different
Two networks, for example, have NG RAN access standard 5G network and have E-UTRAN access standard EPS network；It can also
To be to refer to the accession to standard difference but identical two networks of core net, for example, having the 5G network and tool of NG RAN access standard
The 5G network of standby E-UTRAN access standard.It with first network and the second network is access standard and core in the embodiment of the present application
Two different networks of net do exemplary illustration to method provided by the embodiments of the present application, but this should not be considered as to this Shen
Please protection scope restriction, method provided by the embodiments of the present application be equally applicable to core net it is identical but access standard it is different two
A network.
Scheme provided by the embodiments of the present application can be based on serviceization framework, and the communication between each network element can be based on clothes
The legacy interface of businessization interface or non-serving, the embodiment of the present application do not make specific limit to this.
The embodiment of the present application provides a kind of method for switching network, as shown in fig. 7, this method may include:
701, the first access network equipment receives the from session management (session management, abbreviation SM) network element
One session management information, the first session management information are used to request to establish user face tunnel for the voice service of terminal device.
Specifically, the first session management information is used to request to establish user in the voice service that first network is terminal device
Face tunnel.The voice service of terminal device can be IMS voice service.
Terminal device can be the calling terminal equipment of voice service, or the called terminal equipment of voice service.
User face tunnel is properly termed as QoS flow (QoS flow) in 5G network.
702, the first access network equipment is according to the first session management information and first condition to first movement managed network element
It sends switching request (handover required), switching request is used to terminal device switching to the second net from first network
Network, first condition include: that first network can not carry out voice service.
Wherein, the first access network equipment can be NG RAN, and session management network element can be SMF+PGW-C functional network element,
First movement managed network element can be AMF, and first network can be 5G network, and the second network can be EPS network, in addition,
First network and the second network can be 5G network, and difference is that the access standard of first network and the second network is different.
First session management information is session management relevant to the user face tunnel of IMS voice service of terminal device letter
It ceases, may include the qos parameter in the user face tunnel of the IMS voice service of terminal device in the first session management information, for example,
5G QoS indicates (5G QoS indicator, hereinafter referred to 5QI)=1, distribution/holding priority (allocation/
Retention priority, abbreviation ARP), guarantee bit rate (guaranteed bit rate, abbreviation GBR) and high specific
The parameters such as special rate (maximum bit rate, abbreviation MBR) can also include other information in the first session management information.
SMF+PGW-C functional network element can carry the first session management information in the session pipe for carrying PDU modification order
It is sent in reason request (session management with PDU modification command) to AMF, AMF is again by the
One session management information, which is carried, to be sent in N2 session request (N2session request) to NG RAN.
Method provided by the embodiments of the present application, when in 5G network terminal device carry out voice service when, can pass through by
Terminal device switches to EPS network, so that terminal device can carry out IMS voice service in EPS network, solves 5G net
The problem of terminal device in network can not carry out IMS voice service.
According to the regulation in current 5G network protocol, for the terminal device of based on voice (voice centric), if
The network side of 5G network does not support IMS voice service, then the terminal device based on voice initially should not just select NR to access
5G core net (5G core network, abbreviation 5GC), or even if access 5GC, also want gravity treatment access E-UTRAN and evolved
Packet-based core networks (evolved packet core, abbreviation EPC), then if 5G network does not support IMS voice service, terminal
Equipment cannot rest on 5G network, enjoy the data service service of high speed.And method provided by the embodiments of the present application, in 5G net
When network can not carry out IMS voice service, NG RAN can send switching request to AMF so that terminal device in 5G network from
5G network switching to EPS network, terminal device can carry out IMS voice service in EPS network, so that terminal device can be with
It first rests in 5G network and enjoys the data service service of high speed, when needing to carry out IMS voice service, then switch to EPS net
Network carries out IMS voice service.
Further, in order to which the terminal device guaranteed in 5G network can smoothly carry out voice service, the application is implemented
Example provides under two kinds of scenes, the method that terminal device carries out network switching.
Scene one, first network can not carry out voice service, and the second network can carry out voice service.
Under the scene, first condition can also include: the signal quality of the second networks support both voice business, the second network
The network equipment and terminal device for meeting voice service demand and first network support first network internetwork to cut with second
At least one of change.
Under the scene, terminal device can by the following manner one and in a manner of any one mode in two carry out network
Switching.
Mode one establishes received information by the user face tunnel of announcement session managed network element voice service, makes
The network equipment in first network is that user face tunnel is established in the voice service of terminal device, in terminal device from first network
During switching to the second network, the network equipment in first network is the user face tunnel that the voice service of terminal device is established
Road will be switched to the user face tunnel of the voice service in the second network.
Referring to Fig. 8, mode one be can specifically include:
S11, the first access network equipment send the second session management information, the second session management information to session management network element
Received information is established in user face tunnel including voice service.
Specifically, the first access network equipment can carry the second session management information in N2 conversational response (N2session
Response it is sent in) to first movement managed network element, first movement managed network element again takes the second session management information
Band responds (session management with PDU in the session management for carrying PDU session modification order
Modification command ack) in session management network element send.
It should be noted that since first network can not carry out voice service, although the second session management information packet
The received information of establishing in the user face tunnel of voice service is included, but in fact, the first access network equipment does not give voice
Traffic assignments radio resource.
Optionally, referring to Fig. 8, before step S11, this method can also include: the first access network equipment according to first
Session management information and first condition determine the not user face tunnel distributing radio resource for voice service.
S12, session management network element receive the second session management information that the first access network equipment is sent, according to the second session
Management information determines the user face tunnel relevant information of voice service.
Specifically, the user face tunnel relevant information of the voice service of terminal device is specifically as follows the user of voice service
The relevant Data Detection in face tunnel (packet detection), implementation strategy (enforcement rule), reporting policy
(reporting rule), core network tunnels information (core network tunnel information) etc..
S13, session management network element send the user face tunnel relevant information of voice service to user plane gateway.
Wherein, user plane gateway can be UPF+PGW-U functional network element.
The user face tunnel relevant information of voice service can be carried and be asked in N4 session modification by SMF+PGW-C functional network element
It asks in (N4session modification request) and is sent to UPF+PGW-U functional network element.
S14, user plane gateway receive the user face tunnel relevant information for the voice service that session management network element is sent, and root
User face tunnel relevant information according to voice service is that user face tunnel is established in voice service.
Step S11-S14 can be executed before step 702, can also after step 702, the user face of voice service
Tunnel starts to execute before switching, then can be voice industry by user plane gateway by the switching in the user face tunnel of voice service
The user face tunnel that business is established also switches to the user face tunnel of the voice service in the second network, so that terminal device can
To carry out voice service in the second network.
Mode two, the reason of being rejected by the foundation in the user face tunnel of announcement session managed network element voice service letter
Breath, so that session management network element is the voice industry of terminal device after terminal device completes switching of the first network to the second network
Business re-establishes user face tunnel.
Referring to Fig. 9, mode two be can specifically include:
S21, the first access network equipment send third session management information, third session management information to session management network element
The reason of foundation in the user face tunnel of the voice service including terminal device is rejected information.
It is sent in N2 conversational response to AMF specifically, NG RAN can carry third session management information, AMF is again
Third session management information is carried in the session management response for carrying PDU session modification order to SMF+PGW-C function
Network element is sent.
Optionally, information can be with the reason of refusal are as follows: terminal device is executing switching flow.
S22, session management network element receive the third session management information that the first access network equipment is sent.
S23, session management network element determine that terminal device switches to the second network from first network.
Step S23 in specific implementation can by pass-through mode (1) and in a manner of any one mode in (2) realize, mode
(1) in session management network element be arranged a timer, when the timer times out after, determine terminal device from first network switch
To the second network, mode two is to work as to receive tunnel modification request (modify bearer request), and session management network element is true
Determine terminal device and switch to the second network from first network, the letter for modifying the voice service of terminal device is requested in tunnel modification
Enable face tunnel information.
S24, session management network element are that user face tunnel is established in voice service in the second network according to cause information.
Step S24 in specific implementation, when session management network element determine third session management information be cause information or
Cause information be terminal device when executing switching flow, can after terminal device switches to the second network from first network,
It is that user face tunnel is established in voice service in the second network.
In mode two, although the network equipment in first network is not that user face tunnel is established in voice service,
It is terminal in the second network by making session management network element after determining terminal device and switching to the second network from first network
User face tunnel is established in the voice service of equipment, so that terminal device can carry out voice service in the second network.
Mode two, which provides a kind of first network, can not carry out voice service but the second network can carry out voice service
Scene under terminal device handover network method, the first access network equipment when receiving the first session management information, can and
When switching first network in terminal device to the second network, so that the terminal device in first network continues to hold in the second network
Row audio call Establishing process, while the first access network equipment is executing switching flow as cause information refusal language using terminal device
The foundation in the user face tunnel of sound business rebuilds language to trigger user plane gateway after terminal device successful switch to the second network
The user face tunnel of sound business is (since under the scene, the second network can carry out voice conversation, so that the user face tunnel can be with
It is successfully established) so that terminal device carries out voice service in the second network.
Scene two, first network and the second network can not carry out voice service.
Under the scene, first condition can also include: that the second network can not carry out voice service.
Under the scene, terminal device can by the following manner three and in a manner of any one mode in four carry out network
Switching.
Mode three, the reason of being rejected by the foundation in the user face tunnel of announcement session managed network element voice service letter
Breath, so that session management network element is the voice industry of terminal device after terminal device completes switching of the first network to the second network
Business re-establishes user face tunnel and carries out so that terminal device is fallen after rise into 2G/3G network when user face tunnel establishes unsuccessful
Voice service.
Mode three can specifically include:
S31-S34。
Step S31-S34 and step S21-S24 respectively corresponds identical, i.e., step S31 is identical as step S21, step S32 with
Step S22 is identical, and step S33 is identical as step S23, and step S34 is identical as step S24.For details, reference can be made to Fig. 9.
In specific implementation, the process that user face tunnel is established specifically can be by following procedure P1 into P4 by step S34
Any one process realize.
Referring to Figure 10, process P1 may include:
(11), gateway sends tunnel to the second mobile management network element and establishes request (creat bearer
Request), user face tunnel of the request for requesting to establish voice service for terminal device is established in tunnel.
Wherein, gateway can be SGW, and the second mobile management network element can be MME, the user face tunnel of voice service
Road can be the proprietary of QCI=1 (QCI refers to QoS Class Identifier, and full name in English is qos class identifier)
Carrying.
(12) second mobile management network elements receive gateway send tunnel establish request, and according to second condition to
Gateway sends tunnel and establishes response (creat bearer response).
Wherein, the information being rejected is established in the user face tunnel that the voice service that response includes terminal device is established in tunnel.
Second condition includes that the second network can not carry out voice service, and second condition can also include that terminal device is from the
The terminal device of one network switching to the second network.
Specifically, when the second mobile management network element determines that second condition is set up, the second mobile management network element refusal
User face tunnel is established for voice service, and the information is included in tunnel and is established in response to gateway transmission.
After step (12), the user face tunnel of voice service can be established the information being rejected and pass through meeting by gateway
Managed network element, policy control functions network element informing IMS network element are talked about, so that the circuit domain of IMS network element triggering terminal equipment exchanges back
Fall (circuit switched fallback, abbreviation CSFB) business.IMS network element can be P-CSCF.
Referring to Figure 11, process P2 may include:
(21), gateway sends tunnel to the second mobile management network element and establishes request, and request is established for asking in tunnel
Seek the user face tunnel that voice service is established for terminal device.
(22), the second mobile management network element sends wireless tunnel to the second access network equipment and establishes request (bearer
Setup request), wireless tunnel establishes request for requesting the voice service for terminal device to establish user face tunnel.
Wherein, the second access network equipment can be eNB, and the user face tunnel of voice service can be the proprietary of QCI=1 and hold
It carries.
(23), the wireless tunnel that the second access network equipment receives that the second mobile management network element is sent establishes request, and root
Wireless tunnel, which is sent, to the second mobile management network element according to second condition establishes response (bearer setup response).
Wherein, it includes that the information being rejected is established in the user face tunnel of voice service that wireless tunnel, which establishes response,.Article 2
Part includes that the second network can not carry out voice service, and second condition can also include that terminal device is that the is switched to from first network
The terminal device of two networks.
Specifically, the second access network equipment refusal is voice industry when the second access network equipment determines that second condition is set up
User face tunnel is established in business, and the information is included in wireless tunnel and is established in response to the transmission of the second mobile management network element.
(24) second mobile management network elements receive the wireless tunnel that the second access network equipment is sent and establish response and basis
Second condition sends tunnel to gateway and establishes response.
Wherein, the information being rejected is established in the user face tunnel that the voice service that response includes terminal device is established in tunnel.
After step (24), the user face tunnel of voice service can be established the information being rejected and pass through meeting by gateway
Managed network element, policy control functions network element informing IMS network element are talked about, so as to the CSFB business of IMS network element triggering terminal equipment.
Wherein, policy control functions network element can be PCF+PCRF functional network element.
Referring to Figure 12, process P3 may include:
(31), gateway sends tunnel to the second mobile management network element and establishes request, and request is established for asking in tunnel
Seek the user face tunnel that voice service is established for terminal device.
(32), the tunnel that the second mobile management network element receives that gateway is sent is established request and is set to the second access net
Preparation send wireless tunnel to establish request, and wireless tunnel establishes request for requesting the voice service for terminal device to establish user face
Tunnel.
(33) second access network equipments receive the wireless tunnel foundation that the second mobile management network element is sent and request, and according to
Second condition sends wireless tunnel to the second mobile management network element and establishes response.
Wherein, it includes that the information being rejected is established in the user face tunnel of voice service that wireless tunnel, which establishes response,.Article 2
Part includes that the second network can not carry out voice service, and second condition can also include that terminal device is that the is switched to from first network
The terminal device of two networks.
Specifically, the second access network equipment refusal is voice industry when the second access network equipment determines that second condition is set up
User face tunnel is established in business, and the information is included in wireless tunnel and is established in response to the transmission of the second mobile management network element.
(34) second mobile management network elements receive the wireless tunnel that the second access network equipment is sent and establish response and basis
Wireless tunnel establishes response and sends tunnel foundation response to gateway.
The information being rejected, tunnel are established in the user face tunnel that wireless tunnel establishes the voice service that response includes terminal device
The information being rejected is established in the user face tunnel that the voice service that response includes terminal device is established in road.
After step (34), the user face tunnel of voice service can be established the information being rejected and pass through meeting by gateway
Managed network element, policy control functions network element informing IMS network element are talked about, so as to the CSFB business of IMS network element triggering terminal equipment.
Since under the scene, the second network can not carry out voice conversation, therefore, the user face tunnel of voice service can not be built
It stands successfully.In this case, terminal device can be made, which to fall after rise, carries out voice service into 2G/3G network, then terminal device is needed
CSFB business is carried out, and combined registering is the subsequent prerequisite condition for initiating CSFB calling of terminal device, terminal device is completed
Combined registering refers to that terminal device completes the combined registering process in the domain EPS and CS.Therefore, in order to guarantee that terminal device is successfully initiated
CSFB calling can specifically pass through it is required that terminal device completes the CSFB business of triggering terminal equipment after combined registering
Any one mode of following four mode W1 into W4 is realized.
Mode W1:
Referring to Figure 10, in process P1, after the second mobile management network element determines that terminal device completes combined registering
Step (12) are executed again, specifically, when the second mobile management network element determines that receive the combined registering from terminal device complete
At message, combined registering completes message and is specifically as follows tracing section updating completion (tracking area update
Complete) message, the second mobile management network element determine that terminal device completes combined registering.
Referring to Figure 11, in process P2, in step (24), the second mobile management network element determine second condition set up and
After terminal device completes combined registering, the second mobile management network element sends tunnel to gateway and establishes response.Specifically, working as
Second mobile management network element determines that receiving the combined registering from terminal device completes message, the second mobile management network element
Determine that terminal device completes combined registering.
Referring to Figure 12, in process P3, if second condition is set up, the second mobile management network element determines that terminal device is completed
Step (32) are executed again after combined registering.Specifically, when the determination of the second mobile management network element is received from terminal device
Combined registering complete message, the second mobile management network element determines that terminal device completes combined registering.
In this approach, due to IMS network element be the user face tunnel for receiving voice service establish the information that is rejected it
The CSFB business of triggering terminal equipment afterwards, the second mobile management network element after determining that terminal device completes combined registering again
Tunnel is sent to gateway and establishes response, so that IMS network element is triggered after terminal device completes combined registering
The CSFB business of terminal device, to guarantee that terminal device successfully initiates CSFB calling.
Mode W2:
In specific implementation, session management network element is according to cause information and second condition in the first preset time by step S34
User face tunnel is established for voice service in the second network after section.
Specifically can by pass-through mode m1 and in a manner of m2 realize.
Mode m1 are as follows: session management network element is according to cause information and second condition to the second net after the first preset time period
Request is established in the gateway transmission tunnel of network, and the user face tunnel that request is used to request to establish voice service is established in tunnel.
Specifically, the start time point of the first preset time period can be the time point for receiving cause information.
Mode m2 are as follows: session management network element sends tunnel foundation to the gateway of the second network according to cause information and asks
It asks, tunnel establishes request and establishes voice service user face tunnel for requesting；Session management network element receives what gateway was sent
Response is established in tunnel, and it includes that the information being rejected is established in the user face tunnel of voice service that tunnel, which is established in response,；Session management
Network element sends first message to policing feature control network element after the first preset time period according to second condition, and first message is used for
Indicate that failure is established in the user face tunnel of voice service.Wherein, first message can be credit control request (credit
Control request, abbreviation CCR), the information that failure is established in user face tunnel may be embodied in CCR.
Specifically, the start time point of the first preset time period can be the time point for receiving cause information.
In this approach, it is believed that when IMS network element postpones the CSFB business of the first preset time period triggering terminal equipment, terminal
Equipment has been completed combined registering, specifically can send tunnel by making session management network element postpone the first preset time period
It establishes request or first message makes the CSFB business of IMS network element the first preset time period triggering terminal equipment of delay, to protect
Card terminal device successfully initiates CSFB calling.
Mode W3:
Referring to Figure 13, mode W3 may include:
W3-1, IMS network element are received as terminal device and establish language in the domain packet switch (packet switching, abbreviation PS)
The request message of sound business.
The request message is specifically as follows invitation (invite) message.
The determination of W3-2, IMS network element can not establish voice service in the ps domain of first network or the second network.
W3-3, IMS network element determine that terminal device completes combined registering.
The CSFB business of W3-4, IMS network element triggering terminal equipment.
In which, determine that terminal device completes the CSFB industry of combined registering and then triggering terminal equipment by IMS network element
Business, to guarantee that terminal device successfully initiates CSFB calling.
Optionally, after step W3-1, this method can also include: that IMS network element according in packet-switched domain establishes language
The request message of sound business determines that terminal device is registered in first network, and then determination is to receive the request in first network
Message.
Optionally, W3-2 can specifically include: IMS network element obtains the voice service from first network ps domain and establishes failure
Information, specifically, IMS network element is set when the information of failure is established in the user face tunnel for receiving voice service by determining terminal
The standby first network that is registered in determines that the ps domain that the information to fail comes from first network is established in the user face tunnel of voice service；
Or, IMS network element, which obtains the voice service from the second network PS field, establishes failure information, specifically, IMS network element is receiving voice
When the information of failure is established in the user face tunnel of business, voice service is determined by determining that terminal device is registered in the second network
The information that failure is established in user face tunnel comes from the ps domain of the second network.
Failure information is established in voice service can be from other network equipments to IMS reported by network elements.
Optionally, W3-3 can specifically include: the determination of IMS network element can not be established in the ps domain of first network or the second network
After the second preset time period that voice service rises, IMS network element determines that terminal device completes combined registering；Alternatively, IMS network element according to
The terminal device obtained from policy control network element or home subscriber server (home subscriber server, abbreviation HSS)
Registered location information, determine terminal device complete combined registering.
Specifically, policy control network element or home subscriber server can actively by the registered location information of terminal device to
IMS reported by network elements can also be inquired from policy control network element or home subscriber server by IMS network element.
When terminal device is the calling terminal equipment of voice service, W3-4 be can specifically include: IMS network element is whole to caller
End equipment sends second message, and second message initiates CSFB caller voice service for triggering calling terminal equipment.
When the called terminal equipment that terminal device is voice service, W3-4 can specifically include: IMS network element is selected to called domain
Equipment sends third message, and third message is used to indicate the called voice service foundation in the ps domain of first network or the second network
Failure, so that the CSFB called voice service of called domain optional equipment triggering called terminal equipment.
Second message and third message can be 500 response messages or 380 response messages or 503 response messages.
Mode four, the first access network equipment announcement session managed network element voice service the foundation in user face tunnel be rejected
Information, if the information being rejected includes that radio resource is insufficient (or resource allocation failure), session management network element is in terminal device
After completing first network to the switching of the second network user face tunnel, user face tunnel are not established for the voice service of terminal device
Road establishes unsuccessful information and is transferred to IMS network by first network, so that the CSFB industry of IMS network triggering terminal equipment
Business.
Mode four specifically includes: the first access network equipment to session management network element send the 4th session management information, the 4th
Session management information includes the information that the foundation in the user face tunnel of voice service is rejected, the user face tunnel of voice service
Establishing the information being rejected includes radio resource deficiency.
In which, session management network element is not set after terminal device switches to the second network from first network for terminal
Standby voice service re-establishes user face tunnel, but by being improved in switching flow, to guarantee terminal device success
CSFB calling is initiated, can specifically be realized by any one mode of above-mentioned W3 and following manner W4 into W8, wherein
W5 and W6 is directed to the case where terminal device is caller terminal device.
Mode W4:
Referring to Figure 14, mode W4 includes:
W4-1, the second mobile management network element receive the 4th message that first movement managed network element is sent, the 4th message
For confirming that terminal device completes reorientation.
4th message is specifically as follows re-positioning request and completes response (relocatioon request complete
Acknowledge) message, reorientation here refer to that terminal device switches in the second flow through a network from first network, terminal
The corresponding mobile management network element of equipment relocates, and relocates from first movement managed network element into the second mobile management
Network element.
W4-2, the second mobile management network element determine that second condition is set up and terminal device completes combined registering.
Second condition includes that the second network can not carry out voice service, and second condition can also include that terminal device is from the
The terminal device of one network switching to the second network.
W4-3, the second mobile management network element send tunnel modification request to gateway, and tunnel modification request is for asking
Seek the signaling plane tunnel information of the voice service of modification terminal device.
After gateway receives tunnel modification request, tunnel modification request, session management net are sent to session management network element
Member sends tunnel modification request to user plane gateway in turn, so that user plane gateway is according to the signaling plane tunnel information of voice service
Establish the signaling plane tunnel of corresponding voice service.Here the signaling plane tunnel of voice service specifically can be the special of QCI=5
With carrying.
It should be noted that IMS network element after knowing that failure is established in user face tunnel, can send second to terminal device
Message (meaning of second message with mentioned hereinabove identical), which is the signaling plane tunnel needed by voice service
Road (i.e. the dedicated bearing of QCI=5) is transferred to terminal device, and user plane gateway can be requested and be completed receiving tunnel modification
After the foundation in the signaling plane tunnel of voice service, second message is sent by signaling plane tunnel to terminal device.In which
In, the second mobile management network element just sends tunnel to gateway after determining that terminal device completes combined registering and modifies
Request, to guarantee that terminal device successfully initiates CSFB calling.
Mode W5:
Referring to Figure 15, mode W5 includes:
W5-1, MME determine that terminal device completes combined registering.
The determination of W5-2, IMS network element can not establish voice service in the ps domain of first network or the second network.
W5-3, IMS network element send second message to terminal device.
The implementation method of each step in mode W5 may refer to above, and details are not described herein.
In which, after MME determines that terminal device completes combined registering, what IMS network element was just sent to terminal device
Second message, it may therefore be assured that terminal device successfully initiates CSFB calling.
Mode W6:
Referring to Figure 16, mode W6 includes:
The determination of W6-1, IMS network element can not establish voice service in the ps domain of first network or the second network.
W6-2, IMS network element send second message to user plane gateway.
W6-3, user plane gateway cache second message.
W6-4, MME determine that terminal device completes combined registering.
W6-5, MME send tunnel modification request to user plane gateway.
W6-6, user plane gateway receive and send second message to terminal device after tunnel modification is requested.
The implementation method of each step and the meaning of related terms in mode W6 may refer to above, no longer superfluous herein
It states.
In which, user plane gateway first caches the second message of IMS network element transmission, after receiving tunnel modification request
Second message is sent to terminal device, since tunnel modification request is after MME determines that terminal device completes combined registering
It is sent to user plane gateway, it may therefore be assured that terminal device successfully initiates CSFB calling.
Mode W7:
Referring to Figure 17, mode W7 includes:
The determination of W7-1, IMS network element can not establish institute's voice traffic in the ps domain of first network or the second network.
W7-2, when terminal device is caller terminal device, the IMS network element postpones the second preset time period and sets to terminal
Preparation send second message；When terminal device is called terminal equipment, the IMS network element postpones the second preset time period to called
Domain optional equipment sends third message.
The implementation method of each step and the meaning of related terms in mode W7 may refer to above, no longer superfluous herein
It states.
In this approach, it is believed that when IMS network element postpones the CSFB business of the second preset time period triggering terminal equipment, terminal
Equipment has been completed combined registering, to guarantee that terminal device successfully initiates CSFB calling.
Above-mentioned first preset time period and the second preset time period can be preset according to actual network condition, and first
Preset time period and the second preset time period can be the same or different, for example, the first preset time period can be 500ms,
Second preset time period can be 100ms.
It should be noted that 5G network does not dispose the special domain CS as 2G/3G network, therefore can not be set for terminal
Standby to provide the CS voice service for being similar to traditional voice, pass-through mode three and mode four, method provided by the embodiments of the present application is also
Terminal device can be made in the case where IMS voice service can not be carried out, carry out CS voice service.
Present invention also provides following 4 embodiments, for illustrating to the above method, wherein embodiment
(1) and the application scenarios of embodiment (2) are that 5G network can not carry out IMS voice service but EPS network can carry out IMS voice industry
The application scenarios of the scene of business, embodiment (3) and embodiment (4) are that 5G network can not carry out IMS voice service and EPS net
Network can not also carry out the scene of IMS voice service.Calling Side and callee side can be divided into again in each example, if without special
Illustrate, describes the UE in the method for Calling Side and each network element refers both to the UE and network element of Calling Side, the method for describing callee side
In UE and each network element refer both to the UE and network element of callee side.
Embodiment (1)
This embodiment offers a kind of methods that calling UE carries out network switching, referring to Figure 18, this method comprises:
1801, UE sends invitation message to P-CSCF, and invitation message establishes IMS voice service for requesting.
The UE is the UE in 5G network, which is for requesting to be that the UE of 5G network establishes voice service in ps domain
Message.
1802, the invitation message that P-CSCF is sent according to the UE received is that UE establishes IMS voice conversation.
Invitation message can be also sent to node (such as S-CSCF and TAS etc. in subsequent caller IMS network by P-CSCF
IMS node), the node in subsequent IMS network starts to process the invitation message received, and called UE is likely to be received called
The invitation message of the calling UE of IMS network forwarding.
1803, P-CSCF sends Authentication Authorization to PCF+PCRF and requests (authentication authorization
Request, abbreviation AAR) to trigger the foundation in the user face tunnel of the IMS voice service of UE.
AAR can carry the user identifier of UE, IMS application layer charging identifier and media description information of IMS voice service etc.,
Media description information may include at least one of following information: classifier mark, the description of bandwidth requirement description information, medium type
Information and qos parameter.
It should be noted that P-CSCF directly can send AAR to PCF+PCRF, it can also be in receiving IMS network
S-CSCF send 183 response messages it is rear to PCF+PCRF send AAR.
1804, the media description information carried in the AAR that PCF+PCRF is sent according to P-CSCF sends to SMF+PGW-C and divides
Group data cell-connection accesses network (packet data unit-connectivity access network, abbreviation PDU-
CAN) the IMS voice industry that session modification (session modification) process is requested to trigger the network element in 5G network as UE
User face tunnel is established in business.
PDU-CAN session modification carries QoS regular (rules), QoS rule include qos parameter set (profile) and
Packet filtering (packet filter) etc., qos parameter set is usually again by one or more in following QoS key parameter
A composition: GBR, ARP, 5QI and MBR etc..
Usually, user face tunnel typically refers to QoS flow, the IMS language for being used for transmission user face data in 5G network
The 5QI in the user face tunnel of sound business can be equal to 1, or other values, with IMS voice service in the embodiment of the present application
Method provided by the embodiments of the present application is illustrated for the 5QI=1 in user face tunnel.
1805, SMF+PGW-C receive PCF+PCRF network element transmission PDU-CAN session modification process request after, to
AMF sends the session management request for carrying PDU session modification order, includes the first SM information, the first SM information in the request
For SM information relevant to the user face tunnel of IMS voice service of UE, user face tunnel may include in the first SM information
Qos parameter can also include other information in the first SM information for example, the parameters such as 5QI=1 and ARP, GBR and MBR.
1806, AMF sends N2 session request to NG RAN according to the first SM information that the SMF+PGW-C received is sent,
Wherein the first SM information of transparent transmission gives NG RAN, so that NG RAN is the user face tunnel distributing pair of 5QI=1 according to the first SM information
The radio resource answered.
1807, NG RAN is determined not according to the first SM information and first condition as the user face tunnel of the IMS voice service of UE
Road distributing radio resource.
It should be noted that step 1807 can execute or not execute, the embodiment of the present application does not limit this specifically
It is fixed.
First condition may include the following conditions: (1) 5G network can not carry out IMS voice service, which indicates 5G net
Network does not dispose IMS voice service, or current 5G network signal covering difference is insufficient for the requirement of IMS voice service；(2)
EPS networks support both voice business, the condition can by operator as local policy configuration on NG RAN；(3) EPS network
Signal quality meets voice service demand, and NG RAN can go to measure and report the signal matter of periphery EPS cell by instruction UE
It measures and determines whether the signal quality of EPS network meets voice service demand；(4) network equipment (AMF, NG RAN etc.) of 5G network
5G network and the internetwork switching of EPS are supported with UE, wherein whether UE and AMF supports 5G network and the internetwork switching of EPS,
NG RAN can be informed by N2 message when UE becomes connecting (connected) state from free time (idle) state from AMF.
1808, NG RAN sends N2 conversational response (N2session response) to AMF.
It include the 2nd SM information in N2 conversational response, the 2nd SM information includes the user face tunnel of the IMS voice service of UE
Establish received information.
1809, AMF carries PDU session modification order to SMF+PGW-C transmission according to the N2 conversational response received
Session management response, wherein to the 2nd SM information of SMF+PGW-C transparent transmission.
1810, SMF+PGW-C is rung according to the session management for carrying PDU session modification order that the AMF received is sent
N4 session modification request should be sent to UPF+PGW-U.Here it is N4 interface that N4, which refers between SMF+PGW-C and UPF+PGW-U,
But the embodiment of the present application does not limit the interface name, namely does not limit the message name as N4 session modification request.
Relevant Data Detection (the packet in user face tunnel of 5QI=1 is carried in N4 session modification request
Detection), implementation strategy (enforcement rule), reporting policy (reporting rule), core network tunnels information
(CN tunnel information) etc., so that UPF+PGW-U can establish corresponding core for the user face tunnel of 5QI=1
Net tunnel.
1811, UPF+PGW-U receives the N4 session modification request that SMF+PGW-C is sent, and according to N4 session modification request
Corresponding core network tunnels are established for the user face tunnel of 5QI=1.
It should be noted that user face tunnel typically refers to the QoS flow for being used for transmission user face data in 5G network,
And user face tunnel typically refers to the carrying (bearer) for being used for transmission user face data in EPS network.UPF+PGW-U is 5QI
=1 user face tunnel is established after the tunnel of corresponding user face, during UE is from 5G network switching to EPS network, meeting
By the user face, tunnel is also switched over, namely the dedicated bearer of QCI=1 is switched to from the QoS flow of 5QI=1.Specifically,
The tunnel modification request that SMF+PGW-C can be sent by the SGW received has judged the user face tunnel of the 5QI=1 of UE
From 5G network switching at the user face tunnel of the QCI=1 of EPS network, and the user face tunnel of QCI=1 has built up success.
UE is after from 5G network switching to EPS network, and after UE receives the related signaling of the IMS voice service of EPS forwarded, UE is in EPS
Network continues subsequent IMS audio call Establishing process, to completely establish IMS voice conversation.
After step 1811, UPF+PGW-U can also send the response of N4 session modification, SMF+PGW-C meeting to SMF+PGW-C
PDU-CAN session modification is sent to PCF+PCRF, PCF+PCRF can send re-authentication to P-CSCF and request (Re-
Authentication Request, abbreviation RAR), P-CSCF can send credit re-authorization response (re- to PCF+PCRF
Authentication answer, abbreviation RAA), thus the user face tunnel of IMS voice service known to P-CSCF is successfully established.
1812, NG RAN sends switching request to AMF according to the first SM information and first condition received to trigger UE
From 5G network switching to EPS network.
Specifically, when first condition is set up, when NG RAN determines the user for having a 5QI=1 according to the first SM information
When face tunnel needs to establish, switching request can be sent to AMF.
UE may refer to standard agreement from 5G network switching to the switching flow of EPS network, and details are not described herein.UE is from 5G
After network switching to EPS network, after UE receives the related signaling of IMS voice service of EPS forwarded, UE EPS network after
Continue subsequent IMS audio call Establishing process, to completely establish IMS voice conversation.
The embodiment additionally provides a kind of method that called UE carries out network switching, referring to Figure 19, this method comprises:
1901, P-CSCF receives the invitation message that S-CSCF is sent, and is that UE establishes IMS voice meeting according to invitation message
Words.
The invitation message is for requesting to be that the UE of 5G network establishes in ps domain the message of voice service.
1902, P-CSCF sends invitation message to UE.
1903, UE receives the invitation message of P-CSCF transmission and replys 183 response messages to P-CSCF.
1904, P-CSCF receives 183 response messages that UE is sent, and sends 183 response messages to S-CSCF.
S-CSCF further can send 183 response messages to calling party S-CSCF, and calling party S-CSCF is further to caller
Square P-CSCF sends 183 response messages, can be to if calling party P-CSCF receives 183 response messages of calling party S-CSCF transmission
Calling UE forwards 183 response messages.
1905-1914。
Step 1905-1914 and step 1803-1812 respectively corresponds identical, i.e., step 1905 is identical as step 1803, step
Rapid 1906 is identical as step 1804, and so on, step 1914 is identical as step 1812, similar description meaning phase hereinafter
Together.
Above-described embodiment (1), which provides a kind of 5G network, can not carry out IMS voice service but EPS network can carry out
The method of terminal device handover network under the scene of IMS voice service, NG RAN are established in the user face tunnel for receiving 5QI=1
When request, 5G terminal can be switched in time to EPS network, exhaled so that the terminal device in 5G continues to execute IMS voice in EPS network
It is Establishing process.
Embodiment (2)
This embodiment offers a kind of method that calling UE carries out network switching, referring to fig. 20, this method comprises:
2001-2006。
Step 2001-2006 and step 1801-1806 respectively corresponds identical.
2007, NG RAN sends N2 conversational response to AMF according to the first SM information and first condition.
NG RAN can determine that request to establish is the user face tunnel of IMS voice service according to the first SM information, specifically
For the user face tunnel of 5QI=1.
It include the 3rd SM information in N2 conversational response, the 3rd SM information, which may include, shows that NG RAN refusal is 5QI=1's
The SM information of user face tunnel distributing radio resource, and information the reason of carry refusal, cause information are that UE is executing switching
Process, further, cause information can be carrying out the switching of 5G network to EPS network for UE, so as to SMF+PGW-C according to
The cause information determines after the switching flow of UE, re-initiates the foundation in the user face tunnel of the IMS voice service of UE.
First condition may include the following conditions: (1) 5G network can not carry out IMS voice service, which indicates 5G net
Network does not dispose IMS voice service, or current 5G network signal covering difference is insufficient for the requirement of IMS voice service；(2)
EPS networks support both voice business, the condition can by operator as local policy configuration on NG RAN；(3) EPS network
Signal quality meets voice service demand, and NG RAN can go to measure and report the signal matter of periphery EPS cell by instruction UE
It measures and determines whether the signal quality of EPS network meets voice service demand；(4) network equipment (AMF, NG RAN etc.) of 5G network
5G network and the internetwork switching of EPS are supported with UE, wherein whether UE and AMF supports 5G network and the internetwork switching of EPS,
NG RAN can be informed by N2 message when UE becomes connected state from Idle state from AMF.
2008, AMF carries PDU session modification order to SMF+PGW-C transmission according to the N2 conversational response received
Session management request, wherein to the 3rd SM information of SMF+PGW-C transparent transmission.
2009, SMF+PGW-C is asked according to the session management for carrying PDU session modification order that the AMF received is sent
The 3rd SM information in asking, the IMS voice industry that determination is again UE in EPS network after from 5G network switching to EPS network in UE
User face tunnel is established in business.
It should be noted that establishing user face tunnel in the IMS voice service that EPS network is UE again refers to QCI=1
User face tunnel foundation.
During UE is from 5G network switching to EPS network, SMF+PGW-C can pass through what the SGW received was sent
Tunnel modification request judges that UE has succeeded from 5G network switching to EPS network.In addition, SMF+PGW-C can also be by setting
Timer is set, timer timing is triggered since receiving the 3rd SM information, timer timing terminates, and judges that UE has succeeded
From 5G network switching to EPS network.
2010, NG RAN sends switching request to AMF according to the first SM information and first condition received to trigger UE
From 5G network switching to EPS network.
Specifically, when first condition is set up, when NG RAN determines the user for having a 5QI=1 according to the first SM information
When face tunnel needs to establish, switching request can be sent to AMF.
UE may refer to standard agreement from 5G network switching to the switching flow of EPS network, and details are not described herein.
2011, SMF+PGW-C sends tunnel to SGW and establishes request (create bearer after the completion of UE switches
Quest) to trigger the foundation in the user face tunnel of QCI=1.
Subsequent, the user face tunnel of QCI=1 is successfully established in EPS network, and EPS network feeds back IMS language to IMS network
The user face tunnel of sound business is successfully established, and the user face tunnel Establishing process and IMS voice conversation of QCI=1 is in EPS network
Establishing process is specifically shown in standard agreement, and details are not described herein again.
The embodiment additionally provides a kind of method that called UE carries out network switching, and referring to fig. 21, this method comprises:
2101-2113。
Wherein, step 2101-2104 and step 1901-1904 respectively corresponds identical, step 2105-2113 and step
2003-2111 respectively corresponds identical.
Above-described embodiment (2), which provides a kind of 5G network, can not carry out IMS voice service but EPS network can carry out
The method of terminal device handover network under the scene of IMS voice service, NG RAN are established in the user face tunnel for receiving 5QI=1
When request, 5G terminal can be switched in time to EPS network, exhaled so that the terminal device in 5G continues to execute IMS voice in EPS network
It is Establishing process, while NG RAN to be to switch the foundation in the user face tunnel for refuse for cause information 5QI=1, with
Triggering core network gateway rebuilds the user face tunnel of QCI=1 after UE successful switch to EPS network.
Embodiment (3)
This embodiment offers a kind of method that calling UE carries out network switching, referring to fig. 22, this method comprises:
2201-2210。
Step 2201-2210 and step 2001-2010 respectively corresponds identical.
2211, SMF+PGW-C sends tunnel to SGW and establishes request to trigger the user of QCI=1 after the completion of UE switches
The foundation in face tunnel.
2212, SGW is established to MME forwarding tunnel and is requested.
After step 2212, MME receives tunnel and establishes request and execute process one (including a1), process in following procedure
Any one process in two (including b1-b4) and process three (including c1-c4).
Process one:
A1, MME send tunnel to SGW according to second condition and establish response, and the voice service that response includes UE is established in tunnel
User face tunnel establish the information that is rejected.
In process one, second condition may include that the second network can not carry out voice service, can also be from 5G including UE
The UE and UE of network switching to EPS network complete at least one of combined registering, wherein the second network can not carry out voice
Business, which can specifically refer to, can not carry out IMS voice service, and UE completes combined registering and refers to that UE completes the connection in the domain EPS and CS
Close register flow path.
Specifically, message is completed in the registration that MME can be sent according to the UE received determines that UE completes combined registering.
Before a1, MME can send wireless tunnel foundation to eNB for IMS voice service and request and receive response message,
Wireless tunnel can not also be sent to establish request and receive response message, herein without limitation.
Process two:
B1, MME send wireless tunnel to eNB and establish request, and wireless tunnel establishes request for requesting the IMS voice for UE
Business establishes user face tunnel, and specifically, the user face tunnel of IMS voice service can refer to the dedicated bearing of QCI=1.
B2, eNB receive wireless tunnel and establish request, send wireless tunnel to MME according to second condition and establish response, wirelessly
The information being rejected is established in the user face tunnel that IMS voice service of the response including UE is established in tunnel.
In process two, second condition includes that the second network can not carry out IMS voice service, can also be from 5G net including UE
Network switches to the UE of EPS network.
B3, MME receive the wireless tunnel that eNB is sent and establish response, if second condition is set up, MME determines that UE completes joint
Registration.
The information being rejected is established in the user face tunnel that wireless tunnel establishes IMS voice service of the response including UE.
Specifically, step b3 is in specific implementation, when MME determines that message is completed in the registration for receiving UE transmission, MME is true
Determine UE and completes combined registering.
B4, MME send tunnel to SGW and establish response, and the user face tunnel of IMS voice service of the response including UE is established in tunnel
The information being rejected is established in road.
Process three:
If c1, second condition are set up, MME determines that UE completes combined registering.
Specifically, step c1 is in specific implementation, when MME determines that message is completed in the registration for receiving UE transmission, MME is true
Determine UE and completes combined registering.
In process three, second condition includes that the second network can not carry out IMS voice service, can also be from 5G net including UE
Network switches to the UE of EPS network.
C2, MME send wireless tunnel to eNB and establish request, and wireless tunnel establishes request for requesting the IMS voice for UE
Business establishes user face tunnel.
C3, eNB receive the wireless tunnel that MME is sent and establish request, send wireless tunnel to MME according to second condition and establish
The information being rejected is established in response, the user face tunnel that wireless tunnel establishes IMS voice service of the response including UE.
C4, MME receive the wireless tunnel that eNB is sent and establish response, establish response according to wireless tunnel and send tunnel to SGW
Response is established, the information being rejected is established in the user face tunnel that IMS voice service of the response including UE is established in tunnel.
2213, response is established in the tunnel that SGW receives that MME is sent, and is sent tunnel to SMF+PGW-C and established response.
2214, SMF+PGW-C sends CCR to PCF+PCRF.
CCR carries the instruction that failure is established in the user face tunnel for illustrating QCI=1, can also carry tunnel and establish mistake
The reason of losing information, the cause information establish the reason of response carries information with specific reference to the tunnel that SGW is sent to be arranged.Here
CCR can also be replaced the message by other titles, herein without limitation, such as IP-CAN session modification request.
2215, PCF+PCRF sends Credit Control Answer (credit control answer, abbreviation to SMF+PGW-C
CCA)。
2216, PCF+PCRF sends RAR to P-CSCF according to CCR, and RAR, which can be carried, is used to indicate the insufficient finger of radio resource
Show information (or the instruction information for being used to indicate resource allocation failure).
2217, P-CSCF sends RAA to PCF+PCRF.
2218, P-CSCF according to the radio resource got it is insufficient instruction information (or resource allocation failure instruction believe
Breath) after, determination can not establish the IMS voice service of UE in ps domain.
2219, P-CSCF sends 500 response messages to UE.
After step 2219, after UE receives 500 response messages of P-CSCF transmission, it can select concurrently in caller domain again
CSFB calling is played, the side UE and network side cooperation execute CSFB process, may finally establish audio call in the domain CS.
After step 2219, if 183 response messages have been received in P-CSCF, P-CSCF can be to the IMS net such as S-CSCF
Node in network, which is sent, cancels (cancel) message, to cancel the IMS voice service associated call having requested that.
It should be noted that servicing the mobile management network element of UE during UE is from 5G network switching to EPS network
It is transformed into MME from AMF, therefore, MME can distribute a new globally unique temporary identifier (globally for the UE
Unique temporary identity, abbreviation GUTI).Referring to fig. 22, after switching flow, UE sends tracking area more to MME
Newly (tracking area update, abbreviation TAU) is requested, and MME, can be by institute in the TAU request for receiving NG RAN transmission
Distribution new GUTI bring UE by TAU received message, in order to UE receive carry new GUTI TAU received message it is backward
MME replys TAU and completes message (i.e. combined registering completion message).
In the foregoing description of the embodiment, MME determined UE complete the domain EPS and CS combined registering process after,
Just to SGW send tunnel establish response purpose be, guarantee the user face tunnel of QCI=1 establish unsuccessful message be
The combined registering process that UE completes the domain EPS and CS just reaches IMS network later, 500 response messages sent in order to IMS network
UE can be just reached after the combined registering process that UE completes the domain EPS and CS, it is final to guarantee that UE successfully initiates CSFB calling.
In order to guarantee IMS network send 500 response messages can UE complete the domain EPS and CS combined registering process it
UE is just reached afterwards, in addition to making MME after the combined registering process that UE completes the domain EPS and CS has been determined, just sends tunnel to SGW
Road is established except response, 1 any one mode into mode 5 can also be realized in the following manner.
Mode 1, SMF+PGW-C postpone the first preset time period according to second condition and send tunnel foundation request to SGW.
In mode 1, second condition includes that EPS network can not carry out IMS voice service.
Mode 2, SMF+PGW-C postpone the first preset time period and send CCR to PCF+PCRF.
After mode 3, P-CSCF get the insufficient instruction information of radio resource or the instruction information of resource allocation failure,
Postpone second preset time period and sends 500 response messages to UE.
After sending CCR to PCF+PCRF, SMF+PGW-C instruction UPF+PGW-U caching is sent to by mode 4, SMF+PGW-C
One the first preset time period of data on the user face tunnel of the QCI=5 of UE, after the first preset time period, UPF+PGW-U
It can continue to send to UE.
Mode 5, P-CSCF determine that UE completes the rear of combined registering and sends 500 response messages to UE.
Mode 5 may include: that P-CSCF determination can not establish language in the ps domain of 5G network or EPS network in specific implementation
After the second preset time period that sound business rises, P-CSCF determines that terminal device completes combined registering；Alternatively, P-CSCF according to from
The registered location letter for the terminal device that HSS/ home location register (home location register, abbreviation HLR) obtains
Breath determines that terminal device completes combined registering.
Wherein, the first preset time period and the second preset time period can be set according to actual network traffic conditions
It sets, for example, the first preset time period and the second preset time period all can be 500ms.
The embodiment additionally provides a kind of method that called UE carries out network switching, and referring to fig. 23, this method comprises:
2301-2304。
Step 2301-2304 and step 1901-1904 respectively corresponds identical.
2305-2320。
Step 2305-2320 and step 2203-2218 respectively corresponds identical.
2321, P-CSCF according to the radio resource got it is insufficient instruction information (or resource allocation failure instruction believe
Breath) after, the TAS through S-CSCF into IMS network sends 500 response messages, wherein 500 response messages are specifically destined to TAS
In called domain select functional module T-ADS.
2322, after P-CSCF gets the insufficient instruction information of radio resource (or instruction information of resource allocation failure),
It is sent to UE and cancels message, to cancel the IMS voice service associated session having requested that.
Step 2321 and step 2322 do not limit precedence relationship.
After step 2322, the TAS in IMS network is by the called session again domain domain Xuan ZhiCS, and through equipment such as S-CSCF
It initiates to exhale to the domain CS call control device (such as mobile switching centre (mobile switching center, abbreviation MSC))
It crying, the domain CS call control device initiates to call through SGs interface to MME, the CSFB process of MME triggering UE, the CSFB process through UE,
UE finally may establish voice conversation in the domain CS.Detailed process details is shown in the associated description in 3GPP TS 23.272.Herein not
It repeats again.
In the foregoing description of the embodiment, MME determined UE complete the domain EPS and CS combined registering process after,
Just to SGW send tunnel establish response purpose be, guarantee the user face tunnel of QCI=1 establish unsuccessful message be
The combined registering process that UE completes the domain EPS and CS just reaches IMS network later, 500 response messages sent in order to IMS network
TAS can be just reached after the combined registering process that UE completes the domain EPS and CS, final guarantee IMS is called to be converted to
CSFB is called to reach UE.
In order to guarantee IMS network send 500 response messages can UE complete the domain EPS and CS combined registering process it
TAS is just reached afterwards, in addition to making MME after the combined registering process that UE completes the domain EPS and CS has been determined, is just sent to SGW
Tunnel is established except response, 1 any one mode into mode 5 can also be realized in the following manner.
Mode 1, SMF+PGW-C postpone the first preset time period according to second condition and send tunnel foundation request to SGW.
In mode 1, second condition includes that EPS network can not carry out IMS voice service.
Mode 2, SMF+PGW-C postpone the first preset time period and send CCR to PCF+PCRF.
After mode 3, P-CSCF get the insufficient instruction information of radio resource (or instruction information of resource allocation failure),
Postpone second preset time period and sends 500 response messages to TAS.
After sending CCR to PCF+PCRF, SMF+PGW-C instruction UPF+PGW-U caching is sent to by mode 4, SMF+PGW-C
First preset time period of data (can be cancellation message) on the user face tunnel of the QCI=5 of UE, the first preset time
After section, UPF+PGW-U can continue to send to UE.
Mode 5, P-CSCF determine that UE completes the rear of combined registering and sends 500 response messages to TAS.
Mode 5 may include: that P-CSCF determination can not establish language in the ps domain of 5G network or EPS network in specific implementation
After the second preset time period that sound business rises, P-CSCF determines that terminal device completes combined registering；Alternatively, P-CSCF according to from
The registered location information for the terminal device that HSS/HLR is obtained determines that terminal device completes combined registering.
Wherein, the first preset time period and the second preset time period can be set according to actual network traffic conditions
It sets, for example, the first preset time period and the second preset time period all can be 500ms.
Embodiment (4)
This embodiment offers a kind of method that calling UE carries out network switching, 4, Figure 25, Figure 26 and Figure 27 referring to fig. 2,
This method comprises:
2401-2406。
Step 2401-2406 and step 1801-1806 respectively corresponds identical.
Since the scene of embodiment application is that 5G network can not carry out IMS voice service and EPS network also can not be into
The scene of row IMS voice service, therefore, in order to guarantee that UE successfully initiates CSFB calling, 500 response messages that IMS network is sent
It needs just to reach UE after the combined registering process that UE completes the domain EPS and CS.
It, can be by following procedure 1 (referring to figure after step 2406 in order to guarantee that UE successfully initiates CSFB calling
24), any one process in process 2 (referring to fig. 2 5), process 3 (referring to fig. 2 6) and process 4 (referring to fig. 2 7) completes UE's
Network switching.
Process 1:
A1, NG RAN according to the first SM information and first condition received to AMF send switching request with trigger UE from
5G network switching is to EPS network.
In this case, first condition may include the following conditions: (1) 5G network can not carry out IMS voice service, the condition
Indicate that 5G network does not dispose IMS voice service, or current 5G network signal covering difference is insufficient for IMS voice service
It is required that；(2) network equipment (AMF, NG RAN etc.) of 5G network and UE support 5G network and the internetwork switching of EPS, wherein UE
5G network and the internetwork switching of EPS whether are supported with AMF, can pass through N2 when UE becomes connected state from Idle state from AMF
Message informs NG RAN.(3) EPS network does not support voice service, which can be existed by operator as local policy configuration
On NG RAN；(4) signal quality of EPS network is unsatisfactory for voice service demand, and NG RAN can be by indicating that UE goes measurement simultaneously
The signal quality of periphery EPS cell is reported to determine whether the signal quality of EPS network meets voice service demand.
A2, during UE is from 5G network switching to EPS network, to be switched preparation process terminates, and NG RAN is sent out to UE
Send switching command (handover command).
A3, NG RAN send N2 conversational response to AMF according to first condition, which carries the 4th SM information,
The information that the foundation in the user face tunnel of the 4th SM packet including IMS voice service is rejected, the user face tunnel of IMS voice service
The information that the foundation in road is rejected includes that radio resource is insufficient (or resource allocation failure).
A4, AMF send the meeting for carrying PDU session modification order according to the N2 conversational response received to SMF+PGW-C
Managing response is talked about, wherein to the 4th SM information of SMF+PGW-C transparent transmission.
After A5, SMF+PGW-C parse the 4th SM information, PDU-CAN session modification message is sent to PCF+PCRF.
It include the letter for being used to indicate the user face tunnel foundation failure of IMS voice service in PDU-CAN session modification message
Breath, the instruction information can be the insufficient instruction information of radio resource (or instruction information of resource allocation failure), the present embodiment
In, the message name is not limited as PDU-CAN session modification message, can be other message names, such as CCR.
A6, PCF+PCRF send RAR to P-CSCF, and RAR, which can be carried, to be used to indicate the user face tunnel of IMS voice service and build
The information of vertical failure.
A7, P-CSCF can not be built according to the information determination for being used to indicate the foundation failure of user face tunnel received in ps domain
Vertical IMS voice service.
A8, P-CSCF send 500 response messages to UE, which reaches UPF+PGW-U.
Wherein 500 response message is to be transferred to UE's by the tunnel (specifically certain QoS flow) of 5G network.
A9, during UE is from 5G network switching to EPS network, MME determines that UE completes combined registering.
A10, MME by SGW to SMF+PGW-C send QCI=5 user face tunnel tunnel modify request, for
SMF+PGW-C indicates SGW user face address and the tunnel information of the downlink of QCI=5 dedicated bearing.
A11, SMF+PGW-C send tunnel modification request to UPF+PGW-U, indicate that QCI=5 is proprietary to UPF+PGW-U and hold
The SGW user face address of the downlink of load and tunnel information.Hereafter SMF+PGW-C feeds back tunnel modification response to MME by SGW.
The user face data of A12, UPF+PGW-U on UE forwarding QCI=5 dedicated bearing, i.e. 500 response messages are addressed to
UE。
After step A12, UE initiates CSFB caller voice service, and the side UE and network side cooperation execute CSFB process, finally
Audio call may be established in the domain CS.
Since UE has been moved off 5G network at this time, EPS network is accessed, it, will after 500 response messages reach UPF+PGW-U
UE can be sent to by the IMS signaling tunnel (the user face tunnel of QCI=5) of EPS network by UPF+PGW-U.If P-CSCF is
183 response messages are received, P-CSCF can be sent to the node in the IMS networks such as S-CSCF cancels message, to cancel
The associated call of the IMS voice service of request.
In process 1, disappear since UPF+PGW-U just can send 500 responses to UE after receiving tunnel modification request
Breath, by make MME determine UE complete combined registering after again to SMF+PGW-C so as to UPF+PGW-U transmission QCI=5
User face tunnel tunnel modify request so that IMS network send 500 response messages UE complete the domain EPS and CS
Combined registering process after just reach UE, successfully initiated for UE CSFB call provide guarantee.
Process 2:
B1, NG RAN send N2 conversational response to AMF according to first condition, and N2 conversational response carries the 4th SM information, the
The information that the foundation in the user face tunnel of four SM packet including IMS voice services is rejected, the user face tunnel of IMS voice service
The information that is rejected of foundation include that radio resource is insufficient (or resource allocation failure).
Specifically, NG RAN can determine the 4th SM information according to first condition.
In this case, first condition may include the following conditions: (1) 5G network can not carry out IMS voice service, the condition
Indicate that 5G network does not dispose IMS voice service, or current 5G network signal covering difference is insufficient for IMS voice service
It is required that；(2) network equipment (AMF, NG RAN etc.) of 5G network and UE support 5G network and the internetwork switching of EPS, wherein UE
5G network and the internetwork switching of EPS whether are supported with AMF, can pass through N2 when UE becomes connected state from Idle state from AMF
Message informs NG RAN；(3) EPS network does not support voice service, which can be existed by operator as local policy configuration
On NG RAN；(4) signal quality of EPS network is unsatisfactory for voice service demand, and NG RAN can be by indicating that UE goes measurement simultaneously
The signal quality of periphery EPS cell is reported to determine whether the signal quality of EPS network meets voice service demand.
B2, AMF send the meeting for carrying PDU session modification order according to the N2 conversational response received to SMF+PGW-C
Managing response is talked about, wherein to the 4th SM information of SMF+PGW-C transparent transmission.
B3, SMF+PGW-C determine the notice kept to PCF+PCRF, that is, postpone the use that voice service is notified to PCF+PCRF
The information that the foundation in family face tunnel is rejected.
B4, NG RAN send switching request to AMF according to first condition and the first SM information.
In B5, handoff procedure, MME determines that UE completes combined registering.
B6, MME by SGW to SMF+PGW-C send QCI=5 user face tunnel tunnel modify request, for
The SGW user face address of SMF+PGW-C indicating downlink and tunnel information.
B7, SMF+PGW-C send tunnel modification request to UPF+PGW-U, indicate QCI=5 dedicated bearing to UPF+PGW-U
Downlink SGW user face address and tunnel information.Hereafter SMF+PGW-C feeds back tunnel modification response to MME by SGW.
B8, SMF+PGW-C send IP CAN session modification message to PCF+PCRF.
IP CAN session modification message carries the information for being used to indicate the user face tunnel foundation failure of IMS voice service,
The instruction information can be the insufficient instruction information of radio resource (or instruction information of resource allocation failure).In the present embodiment,
The message name is not limited as IP-CAN session modification message, can be other message names, such as CCR.
B9, PCF+PCRF send RAR to P-CSCF, and RAR carries the user face tunnel foundation for being used to indicate IMS voice service
The information of failure.
B10, P-CSCF can not be in ps domains according to the information determination for being used to indicate the foundation failure of user face tunnel received
Establish IMS voice service.
B11, P-CSCF send 500 response messages to UE.
After step B11, UE initiates CSFB caller voice service, and the side UE and network side cooperation execute CSFB process, finally
Audio call may be established in the domain CS.
In process 2, since P-CSCF can just be sent out after failure is established in the user face tunnel for determining IMS voice service to UE
500 response messages are sent, by making MME after determining that UE completes combined registering, PCF+PCRF is sent to P-CSCF for referring to
Show that the information of failure is established in the user face tunnel of IMS voice service, so that 500 response messages that IMS network is sent are in UE
It completes just to reach UE after the combined registering process in the domain EPS and CS, CSFB calling is successfully initiated for UE and provides guarantee.
Process 3:
C1, NG RAN send N2 conversational response to AMF according to first condition, and N2 conversational response carries the 4th SM information, the
The information that the foundation in the user face tunnel of four SM packet including IMS voice services is rejected, the user face tunnel of IMS voice service
The information that is rejected of foundation include that radio resource is insufficient (or resource allocation failure).
Specifically, NG RAN can determine the 4th SM information according to first condition.
In this case, first condition may include the following conditions: (1) 5G network can not carry out IMS voice service, the condition
Indicate that 5G network does not dispose IMS voice service, or current 5G network signal covering difference is insufficient for IMS voice service
It is required that；(2) network equipment (AMF, NG RAN etc.) of 5G network and UE support 5G network and the internetwork switching of EPS, wherein UE
5G network and the internetwork switching of EPS whether are supported with AMF, can pass through N2 when UE becomes connected state from Idle state from AMF
Message informs NG RAN；(3) EPS network does not support voice service, which can be existed by operator as local policy configuration
On NG RAN；(4) signal quality of EPS network is unsatisfactory for voice service demand, and NG RAN can be by indicating that UE goes measurement simultaneously
The signal quality of periphery EPS cell is reported to determine whether the signal quality of EPS network meets voice service demand.
C2, AMF send the meeting for carrying PDU session modification order according to the N2 conversational response received to SMF+PGW-C
Managing response is talked about, wherein to the 4th SM information of SMF+PGW-C transparent transmission.
C3, SMF+PGW-C are responded according to the session management for carrying PDU session modification order that the AMF received is sent
N4 session modification request is sent to UPF+PGW-U.
It include the first order in N4 session modification request, the first order is used to indicate the use of UPF+PGW-U caching 5QI=5
Data on the tunnel of family face.
C4, UPF+PGW-U are responded according to the N4 session modification request received to SMF+PGW-C feedback N4 session modification.
C5, SMF+PGW-C send PDU CAN session modification message to PCF+PCRF.
PDU CAN session modification message carries the information for being used to indicate the user face tunnel foundation failure of IMS voice service,
The instruction information can be the insufficient instruction information of radio resource (or instruction information of resource allocation failure).In the present embodiment,
The message name is not limited as IP-CAN session modification message, can be other message names, such as CCR.
C6, PCF+PCRF send RAR to P-CSCF, and RAR carries the user face tunnel foundation for being used to indicate IMS voice service
The information of failure.
C7, P-CSCF feed back RAA to PCF+PCRF.
C8, P-CSCF can not be built according to the information determination for being used to indicate the foundation failure of user face tunnel received in ps domain
Vertical IMS voice service.
C9, P-CSCF send 500 response messages to UE, which reaches UPF+PGW-U.
C10, UPF+PGW-U cache the data on the user face tunnel of 5QI=5.
Data on the user face tunnel of 5QI=5 may include 500 response messages.
C11, NG RAN send switching request to AMF according to first condition and the first SM information.
C12, MME determine that UE completes combined registering.
C13, MME send the tunnel modification request (modify in the user face tunnel of QCI=5 by SGW to SMF+PGW-C
Bearer request), for the SGW user face address of SMF+PGW-C indicating downlink and tunnel information.
C14, SMF+PGW-C send tunnel modification request to UPF+PGW-U, and tunnel modification request includes the second order,
Second order is used to indicate the information for the data that UPF+PGW-U stops on caching QCI=1.
After step C14, UPF+PGW-U can send 500 response messages to UE, and UE initiates CSFB caller voice industry
Business, the side UE and network side cooperation execute CSFB process, may finally establish audio call in the domain CS.
In process 3, by the first order so that 500 response messages that P-CSCF is sent are buffered in UPF+PGW-
U is ordered by second after MME determines that UE completes combined registering so that P-CSCF sends out 500 response messages to terminal device
It send, so that 500 response messages that IMS network is sent just reach after the combined registering process that UE completes the domain EPS and CS
UE successfully initiates CSFB calling for UE and provides guarantee.
Process 4:
D1, NG RAN send N2 conversational response to AMF according to first condition, and N2 conversational response carries the 4th SM information, the
The information that the foundation in the user face tunnel of four SM packet including IMS voice services is rejected, the user face tunnel of IMS voice service
The information that is rejected of foundation include that radio resource is insufficient (or resource allocation failure).
Specifically, NG RAN can determine the 4th SM information according to first condition.
In this case, first condition may include the following conditions: (1) 5G network can not carry out IMS voice service, the condition
Indicate that 5G network does not dispose IMS voice service, or current 5G network signal covering difference is insufficient for IMS voice service
It is required that；(2) network equipment (AMF, NG RAN etc.) of 5G network and UE support 5G network and the internetwork switching of EPS, wherein UE
5G network and the internetwork switching of EPS whether are supported with AMF, can pass through N2 when UE becomes connected state from Idle state from AMF
Message informs NG RAN.(3) EPS network does not support voice service, which can be existed by operator as local policy configuration
On NG RAN；(4) signal quality of EPS network is unsatisfactory for voice service demand, and NG RAN can be by indicating that UE goes measurement simultaneously
The signal quality of periphery EPS cell is reported to determine whether the signal quality of EPS network meets voice service demand.
D2, AMF send the meeting for carrying PDU session modification order according to the N2 conversational response received to SMF+PGW-C
Managing response is talked about, wherein to the 4th SM information of SMF+PGW-C transparent transmission.
D3, SMF+PGW-C send PDU CAN session modification message to PCF+PCRF.In the present embodiment, the message is not limited
Entitled IP-CAN session modification message, can be other message names, such as CCR.
PDU CAN session modification message carries the information for being used to indicate the user face tunnel foundation failure of IMS voice service,
The instruction information can be the insufficient instruction information of radio resource (or instruction information of resource allocation failure).
D4, PCF+PCRF send RAR to P-CSCF, and RAR carries the user face tunnel foundation for being used to indicate IMS voice service
The information of failure.
D5, P-CSCF can not be built according to the information determination for being used to indicate the foundation failure of user face tunnel received in ps domain
Vertical IMS voice service.
D6, P-CSCF feed back RAA message to PCF+PCRF.
D7, P-CSCF determine that the second preset time period of delay sends 500 response messages.
D8, NG RAN according to the first SM information and first condition received to AMF send switching request with trigger UE from
5G network switching is to EPS network.
After step D8, UE executes switching flow, and after to be switched process, P-CSCF sends 500 responses to UE and disappears
Breath, UE initiate CSFB caller voice service, and the side UE and network side cooperation execute CSFB process, may finally establish voice in the domain CS
Calling.
In process 4, P-CSCF postpones the second preset time period and sends 500 response messages, so that IMS network is sent
500 response messages UE complete the domain EPS and CS combined registering process after just reach UE, for UE successfully initiate CSFB calling
Provide guarantee.
The embodiment additionally provides a kind of method that called UE carries out network switching, since the scene of embodiment application is
5G network can not carry out IMS voice service and EPS network can not also carry out the scene of IMS voice service, therefore, in order to guarantee
UE successfully initiates CSFB calling, and 500 response messages that IMS network is sent need to complete the combined registering stream in the domain EPS and CS in UE
TAS is just reached after journey, in order to which UE is called the domain domain Xuan ZhiCS by TAS again, guarantees CSFB access success.Referring to fig. 28, it should
Method includes:
2801-2808。
Step 2801-2808 and step 1901-1908 respectively corresponds identical.
2809-2814。
Step 2809-2814 and step D1-D6 respectively corresponds identical.
2815, P-CSCF postpones the second preset time period to TAS 500 response messages of transmission.Wherein, 500 response messages have
Body is destined to the called domain in TAS and selects functional module T-ADS.
P-CSCF postpones the second preset time period and sends 500 response messages, so that 500 responses that P-CSCF is sent disappear
It ceases and just reaches TAS after the combined registering process that UE completes the domain EPS and CS, provide guarantee for CSFB access success.
The method for switching network that embodiment (3) and embodiment (4) provide, can just make in IMS voice conversation establishment stage
It obtains 5G terminal device and switches to EPS network, then fall UE to 2G/3G network after rise using CSFB technology in EPS network, finally exist
Initiate audio call in the domain network C S 2G/3G.The application reuses traditional 2G/3G network architecture using EPS network as springboard,
A kind of scene that IMS voice service can not be all carried out in 5G network and EPS network is provided for the terminal device in 5G network
The lower method for carrying out voice service.
500 response messages of the above-described embodiment (1) into embodiment (4) can also be 380 response messages or 503 responses
Message, RAR message can also request (abort-session-request, abbreviation ASR) message for session stop, in this case,
RAA message can be session stop response (abort-session-answer, abbreviation ASA) message.
The embodiment of the present application also provides a kind of network registering methods, as shown in Figure 28 A, this method comprises:
2801A, first movement managed network element receive registration request (registration request) from terminal device,
Terminal device is registered in first network for requesting by registration request.
Wherein, first movement managed network element can be AMF, and first network can be 5G network.
If 2802A, third condition are set up, first movement managed network element sends the first instruction information to terminal device, the
The voice service that one instruction information is used to indicate ps domain is supported.
Wherein, third condition may include: that first network is supported terminal device being moved to the second network.First network branch
It holds and terminal device is moved to the second network can refer to that first network is supported through switching or redirected or other modes are by terminal
Equipment is moved to the second network.
Optionally, first network is supported terminal device being moved to the second network, may include: first in first network
Access network equipment is supported when receiving from the first session management information of session management network element, and terminal device is accessed second
Network, the first session management information are used to request to establish user face tunnel for the voice service of terminal device.Wherein, the first access
Net equipment can be NG RAN, and session management network element can be SMF+PGW-C functional network element.
Illustratively, the first instruction information can carry in registration received message, and voice service can be IMS voice industry
Business, terminal device specifically can be the terminal device for initiating caller or called voice service.
Specifically, first movement managed network element can in the following manner in any one mode or other modes it is true
Whether true determine third condition:
(1) during terminal device is registered in first network, first movement managed network element is current whole by obtaining
Whether access network equipment and/or core network element equipment where end equipment have the energy that terminal device is moved to the second network
Power determines whether third condition is true.
(2) first movement managed network element determines whether third condition is true by the configuration condition of itself, the configuration
Whether the access network equipment and/or core network element equipment being configured with where terminal device in condition can be mobile by terminal device
To the second network.
Optionally, the core net of first network and the second network is identical, and access standard is different；Alternatively, first network and
The core net and access standard of two networks are different.
In the case where the core net of first network and the second network and different access standard, the second network can be
EPS network, in the case where the identical access standard of core net of first network and the second network is different, first network and second
Network can be 5G network, and difference is that the access standard of first network and the second network is different.
Specifically, the first access network equipment can be by sending terminal device to first movement managed network element from first
Terminal device is accessed the second network by the switching request of network switching to the second network.It should be noted that when terminal device is sent out
When playing ps domain voice service, terminal device is just accessed the second network by the first access network equipment, and terminal device can be initiation master
The terminal device for crying ps domain voice service is also possible to initiate the terminal device of called ps domain voice service.
Optionally, third condition can also include: that switching interoperability is supported between first network and the second network.The situation
Under, first network supports that terminal device is moved to the second network by switching.
Optionally, switching interoperability is supported between first network and the second network, comprising: first network and the second network it
Between exist switching interworkng interface.Illustratively, switching interworkng interface is specifically as follows N26 interface.
Optionally, the second network can support ps domain voice service, can not also support ps domain voice service.If limiting the
Two network support ps domain voice services, then third condition can also include: that the second network can support ps domain voice service.
Optionally, before step 2803A, this method can also include: that first movement managed network element determines that terminal is set
The standby terminal device for based on voice service.Since the terminal device based on data service is unrelated with voice service, this can
The method of choosing can not need the terminal device based on data service to execute this sets of plan, i.e., with distinguishing terminal type
Do not need to determine whether third condition is true, also no need to send the first instruction information.
Optionally, this method can also include: that terminal device generates registration request, and carried terminal equipment is in registration request
The instruction information of terminal device based on voice service；Terminal device sends registration request to first movement managed network element；
In this case, first movement managed network element determines that terminal device is the terminal device based on voice service, comprising: first moves
Mobility management network element determines that terminal device is the terminal device based on voice service according to registration request.
In this case, terminal device passes through the terminal device that registration request carried terminal equipment is based on voice service
Indicate information, thus do not have to individually send the signaled first movement managed network element instruction information, can saving signaling open
Pin.
Optionally, before step 2803A, this method can also include: that first movement managed network element determines that terminal is set
It is standby to support to be moved to the second network from first network during voice service is initiated and voice service is continued by the second network
Initiation process.Due to only having terminal device to support to be moved to the second network simultaneously from first network during voice service is initiated
In the case where the initiation process for continuing voice service by the second network, the above method just be can be implemented, therefore, can be true in advance
The fixed information avoids influencing not supporting being moved to the second network from first network during voice service is initiated and by the
Two networks continue the terminal device of the initiation process of voice service.
Optionally, carried terminal equipment is gone back in registration request to support during voice service is initiated from first network movement
Continue the instruction information of the initiation process of voice service to the second network and by the second network, first movement managed network element is true
Determine terminal device to support to be moved to the second network from first network during voice service is initiated and continue by the second network
The initiation process of voice service, comprising: first movement managed network element determines that terminal device is supported in voice according to registration request
Business is moved to the second network from first network during initiating and continues the initiation process of voice service by the second network.
In this case, terminal device is supported during voice service is initiated by registration request carried terminal equipment from the
The instruction information of one Network Mobility to the second network and the initiation process by the continuation voice service of the second network, to not have to single
The signaled first movement managed network element instruction information is solely sent, it being capable of saving signaling expense.
It should be noted that the method that the embodiment provides, can execute any one method in Figure 28 foregoing description
Before.In addition, first movement managed network element may not also be sent to terminal device under other conditions under third condition
First instruction information.
The method that the embodiment provides, no matter whether first network supports the voice service of terminal device, as long as the first net
Network has when terminal device initiates voice service by switching or other modes fall the terminal device to can provide voice after rise
The ability of the network of business, then when the terminal device is registered to first network, first movement managed network element just instruction terminal
The voice service of equipment ps domain is supported, to guarantee that terminal device is registered and resides in first network without reselecting to other nets
Network saves Internet resources, and guarantees that terminal device normally executes ps domain voice service register flow path and hair by first network
Play ps domain audio call process.
The embodiment of the present application also provides a kind of network registering methods, as shown in Figure 28 B, for side shown in Figure 28 A
Method illustrates, this method comprises:
2801B, UE send registration request to AMF.
Specifically, UE is registered in first network for requesting by registration request, UE can send registration request to NG RAN,
NG RAN forwards the registration request to AMF.
UE can be carried in registration request to support for the instruction information and UE of the UE based on voice service in voice service
The second network is moved to from first network during initiation and continues the instruction of the initiation process of voice service by the second network
Information.
2802B, AMF receive registration request from UE.
2803B, AMF determine that UE supports to be moved to the from first network during voice service is initiated according to registration request
Two networks and the initiation process for continuing voice service by the second network.
2804B, AMF determine that UE is the UE based on voice service according to registration request.
The execution sequence of step 2803B and step 2804B are in no particular order.
2805B, AMF determine whether third condition is true.
If so, executing step 2806B.Wherein, third condition includes: that first network is supported UE being moved to the second network,
Second network can support the voice service of ps domain.It is drawn so that AMF determines that third condition is set up as an example in Figure 28 B.
2806B, AMF send the first instruction information to UE, and the voice service that the first instruction information is used to indicate ps domain is propped up
It holds.
Wherein, the first instruction information can carry in registration received message.
After step 2806B, UE continues follow-up process.
It is above-mentioned that mainly scheme provided by the embodiments of the present application is described from the angle of interaction between each network element.It can
With understanding, in order to realize the above functions, it comprises execute each corresponding hardware knot of function for above-mentioned each network equipment
Structure and/or software module.Those skilled in the art should be readily appreciated that, described in conjunction with the examples disclosed in this document
Each exemplary unit and algorithm steps, the application can be realized with the combining form of hardware or hardware and computer software.Certain
A function is executed in a manner of hardware or computer software driving hardware actually, depending on technical solution specific application and
Design constraint.Professional technician can realize described function using distinct methods to each specific application
Can, but this realization is it is not considered that exceed scope of the present application.
The embodiment of the present application can carry out the division of functional module, example according to above method example to each network equipment
Such as, each functional module of each function division can be corresponded to, two or more functions can also be integrated at one
It manages in module.Above-mentioned integrated module both can take the form of hardware realization, can also use the form of software function module
It realizes.It should be noted that being schematical, only a kind of logic function stroke to the division of module in the embodiment of the present application
Point, there may be another division manner in actual implementation.
Illustratively, a kind of functional module for illustratively giving the network equipment provided by the embodiments of the present application below is drawn
The mode of dividing.
The embodiment of the present application also provides a kind of network equipment 290, referring to fig. 29, including processing unit 2901 and transmitting-receiving it is single
Member 2902.
The network equipment can connect for the first access network equipment, session management network element, the second mobile management network element, second
Log equipment, IMS network element or first movement managed network element.
Specifically, processing unit 2901 is for passing through receipts when being the schematic diagram of the first access network equipment shown in Figure 29
Bill member 2902 receives the first session management information from session management network element, and the first session management information is for requesting as eventually
User face tunnel is established in the voice service of end equipment；By Transmit-Receive Unit 2902 according to the first session management information and first condition
Switching request is sent to first movement managed network element, switching request is used to terminal device switching to the second net from first network
Network, first condition include: that first network can not carry out voice service.
Optionally, first condition further include: the second networks support both voice business, the second network signal quality meet voice
The network equipment and terminal device of business demand and first network are supported in first network and the second internetwork switching extremely
It is one few.
Optionally, processing unit 2901 is also used to send the second session pipe to session management network element by Transmit-Receive Unit 2902
Information is managed, the second session management information includes that received information is established in the user face tunnel of voice service.
Optionally, processing unit 2901 is also used to be determined not according to the first session management information and first condition as voice industry
The user face tunnel distributing radio resource of business.
Optionally, processing unit 2901 is also used to send third session pipe to session management network element by Transmit-Receive Unit 2902
Information is managed, third session management information includes the information that the foundation in the user face tunnel of voice service is rejected.
Optionally, the reason of information that the foundation in the user face tunnel of voice service is rejected includes refusal information.
Optionally, cause information is that terminal device is executing switching flow.
Optionally, first condition further include: the second network can not carry out voice service, and processing unit 2901 is also used to pass through
Transmit-Receive Unit 2902 sends the 4th session management information to session management network element, and the 4th session management information includes voice service
The information that the foundation in user face tunnel is rejected, the information that the foundation in the user face tunnel of voice service is rejected include wireless money
Source is insufficient.
When the terminal device in first network carries out voice service, the network equipment 290 can be by cutting terminal device
The second network is shifted to, so that terminal device can carry out voice service in the second network, solves the end in first network
End equipment can not carry out the problem of voice service.
When being the schematic diagram of session management network element shown in Figure 29, processing unit 2901 is used to pass through Transmit-Receive Unit 2902
The third session management information of the first access network equipment transmission is received, the third session management information includes the language of terminal device
The reason of foundation in the user face tunnel of sound business is rejected information；Determine that the terminal device switches to second from first network
Network；User face tunnel is established for institute's voice traffic in second network according to the cause information.
Optionally, the cause information is that the terminal device is executing switching flow.
Optionally, processing unit 2901 is specifically used for according to the cause information and second condition in the first preset time period
User face tunnel is established for institute's voice traffic in second network afterwards, the second condition includes second network can not
Carry out institute's voice traffic.
Optionally, processing unit 2901 is specifically used for through Transmit-Receive Unit 2902 according to the cause information and described second
Condition sends tunnel to the gateway of second network after first preset time period and establishes request, and the tunnel is built
Vertical request is used to request to establish the user face tunnel of institute's voice traffic.
Optionally, processing unit 2901 is specifically used for through Transmit-Receive Unit 2902 according to the cause information to described second
The gateway of network sends tunnel and establishes request, and the tunnel establishes request and establishes voice service user face tunnel for requesting
Road；The tunnel that the gateway is sent is received by Transmit-Receive Unit 2902 and establishes response, and the tunnel, which is established in response, includes
The information being rejected is established in the user face tunnel of institute's voice traffic；By Transmit-Receive Unit 2902 according to the second condition in institute
It states and sends first message to policing feature control network element after the first preset time period, the first message is used to indicate the voice
Failure is established in the user face tunnel of business.
When the terminal device in first network switches to the second network from first network, the network equipment 290 is believed according to reason
Breath is that user face tunnel is established in voice service in the second network, if the second network can carry out voice service, user face tunnel
It can establish success, so that terminal device can carry out voice service in the second network, solve in first network
Terminal device can not carry out the problem of voice service.
When being the schematic diagram of the second mobile management network element shown in Figure 29, the network equipment 290 can execute following dynamic
Make one, movement two, movement three or movement four.
Movement one, processing unit 2901 are used to receive the tunnel foundation that gateway is sent by Transmit-Receive Unit 2902 and ask
It asks, user face tunnel of the request for requesting to establish voice service for terminal device is established in the tunnel；Pass through Transmit-Receive Unit
2902, which send tunnel to the gateway according to second condition, establishes response, and it includes that the terminal is set that response is established in the tunnel
The information being rejected is established in the user face tunnel of standby voice service, and the second condition includes described in the second network can not carry out
Voice service.
Optionally, the second condition further include: the terminal device is to switch to second network from first network
Terminal device.
Optionally, processing unit 2901 is also used to determine that the terminal device completes combined registering.
Processing unit 2901 is specifically used for determining that receiving the combined registering from the terminal device completes message.
The network equipment 290 sends tunnel to gateway when the second network can not carry out voice service and establishes response, with
So that the information being rejected is established in user face tunnel by gateway is transferred to IMS network, so that IMS network triggering terminal
The CSFB business of equipment, so that terminal device carries out CS voice service.
Movement two, processing unit 2901 are used to send wireless tunnel to the second access network equipment by Transmit-Receive Unit 2902 and build
Vertical request, the wireless tunnel establish request for requesting the voice service for terminal device to establish user face tunnel；Pass through receipts
Bill member 2902 receives the wireless tunnel that second access network equipment is sent and establishes response, and the wireless tunnel establishes response bag
The information being rejected is established in the user face tunnel for including the voice service of the terminal device；By Transmit-Receive Unit 2902 according to second
Condition sends tunnel to gateway and establishes response, and the use that response includes the voice service of the terminal device is established in the tunnel
The information being rejected is established in family face tunnel, and the second condition includes that the second network can not carry out institute's voice traffic.
Optionally, the second condition further include: the terminal device is to switch to second network from first network
Terminal device.
Optionally, processing unit 2901 is specifically used for determining that the second condition is set up and the terminal device completes joint
Registration；Tunnel, which is sent, to the gateway by Transmit-Receive Unit 2902 establishes response.
Optionally, processing unit 2901 is specifically used for determining that receiving the registration from the terminal device completes message.
User face tunnel is established the information being rejected and sent to gateway by the network equipment 290, so that gateway
The information being rejected is established into user face tunnel and is transferred to IMS network, so that the CSFB industry of IMS network triggering terminal equipment
Business, so that terminal device carries out CS voice service.
Movement three, processing unit 2901 are used to receive the tunnel foundation that gateway is sent by Transmit-Receive Unit 2902 and ask
It asks, user face tunnel of the request for requesting to establish voice service for user equipment terminal device is established in the tunnel；If second
Condition is set up, and determines that the terminal device completes combined registering, the second condition includes that the second network can not carry out institute's predicate
Sound business；Wireless tunnel is sent to the second access network equipment by Transmit-Receive Unit 2902 and establishes request, and the wireless tunnel is established
Request is for requesting the voice service for the terminal device to establish user face tunnel；Described is received by Transmit-Receive Unit 2902
The wireless tunnel that two access network equipments are sent establishes response, and the wireless tunnel establishes the voice that response includes the terminal device
The information being rejected is established in the user face tunnel of business；Response is established to institute according to the wireless tunnel by Transmit-Receive Unit 2902
It states gateway and sends tunnel foundation response, the user face that response includes the voice service of the terminal device is established in the tunnel
The information being rejected is established in tunnel.
Optionally, the second condition further include: the terminal device is to switch to second network from first network
Terminal device.
Optionally, processing unit 2901 is specifically used for determining that receiving the registration that the terminal device is sent completes message.
The determining terminal device of the network equipment 290 completes the information for being rejected the foundation of user face tunnel after combined registering to clothes
Business gateway is sent, so that the information being rejected is established in user face tunnel by gateway is transferred to IMS network, so that
The CSFB business of IMS network triggering terminal equipment, so that terminal device carries out CS voice service, it can also be ensured that terminal is set
It is standby successfully to initiate CSFB calling.
Movement four, processing unit 2901 are used to receive that first movement managed network element is sent by Transmit-Receive Unit 2902
Four message, the 4th message is for confirming that terminal device completes reorientation；By Transmit-Receive Unit 2902 according to second condition to
Gateway sends tunnel modification request, and the signaling for modifying the voice service of the terminal device is requested in the tunnel modification
Face tunnel information, the second condition include that the second network can not carry out institute's voice traffic.
Optionally, processing unit 2901 is specifically used for determining that the second condition is set up and the UE completes combined registering；
The tunnel modification request is sent to the gateway by Transmit-Receive Unit 2902.
When the second network can not carry out voice service, the network equipment 290 sends tunnel modification request, clothes to gateway
Business gateway can by tunnel modify request be forwarded to session management network element, due to session management network element be receive tunnel modification ask
After asking, it can just be sent to terminal device and initiate message that CSFB calls (i.e. second disappearing above for triggering terminal equipment
Breath), therefore, the network equipment 290 triggering terminal equipment can initiate CSFB calling when the second network can not carry out voice service,
So that terminal device carries out CS voice service.
When being the schematic diagram of the second access network equipment shown in Figure 29, processing unit 2901 is for passing through Transmit-Receive Unit
2902, which receive the wireless tunnel that the second mobile management network element is sent, establishes request, and the wireless tunnel establishes request for requesting
Second access network equipment is the user face tunnel that terminal device establishes voice service；By Transmit-Receive Unit 2902 according to second
Condition sends wireless tunnel to second mobile management network element and establishes response, and it includes described that the wireless tunnel, which establishes response,
The information being rejected is established in the user face tunnel of voice service, and the second condition includes that the second network can not carry out the voice
Business.
Optionally, the second condition further include: the terminal device is to switch to second network from first network
Terminal device.
The network equipment 290 is refused to be user face tunnel distributing radio resource when the second network can not carry out voice service,
And the user face tunnel of voice service is established to the information being rejected and is carried in wireless tunnel is established and responded to the second mobility
Managed network element is sent, and user face tunnel can be established the information being rejected and pass to IMS network by the second mobile management network element,
So that the CSFB business of IMS network triggering terminal equipment, so that terminal device carries out CS voice service.
When being the schematic diagram of IMS network element shown in Figure 29, processing unit 2901 is used to receive by Transmit-Receive Unit 2902
The request message of voice service is established in packet switched ps domain for terminal device；Determination can not be in first network or the second network
Ps domain establishes institute's voice traffic；Determine that the terminal device completes combined registering；The circuit domain for triggering the terminal device is handed over
It gains and falls CSFB business.
Optionally, processing unit 2901 is also used to determine that the terminal device is registered in the first network.
Optionally, processing unit 2901 is specifically used for obtaining institute's voice traffic foundation from the first network ps domain
Failure information；Or, obtaining institute's voice traffic from second network PS field establishes failure information.
Optionally, processing unit 2901 can not be in the ps domain of the first network or second network specifically for determination
After establishing the second preset time period that institute's voice traffic rises, determine that the terminal device completes combined registering；Alternatively, according to from
The registered location information for the terminal device that policy control network element or home subscriber server obtain, determines the terminal device
Complete combined registering.
Optionally, the terminal device is the calling terminal equipment of institute's voice traffic, and processing unit 2901 is specifically used for
Second message is sent to the calling terminal equipment by Transmit-Receive Unit 2902, the second message is whole for triggering the caller
End equipment initiates CSFB calling service.
Optionally, the terminal device is the called terminal equipment of institute's voice traffic, and processing unit 2901 is specifically used for
Third message is sent to called domain optional equipment by Transmit-Receive Unit 2902, the third message is used to indicate in the first network
Or the called voice service of the ps domain of second network establishes failure, so that the called domain optional equipment triggers the called end
The CSFB called voice service of end equipment.
The network equipment 290 can not establish voice service and terminal in the ps domain of first network or the second network in determination
When equipment completes combined registering, the CSFB business of triggering terminal equipment, completing combined registering due to terminal device is terminal device
The necessary condition of CSFB calling is initiated, it may therefore be assured that terminal device successfully initiates CSFB calling, so that terminal device
Carry out CS voice service.
When being the schematic diagram of first movement managed network element shown in Figure 29, processing unit 2901 is used for single by transmitting-receiving
Member 2902 receives registration request from terminal device, and terminal device is registered in first network for requesting by registration request；Processing is single
Member 2901 is also used to determine that third condition is set up, and third condition includes: that first network is supported terminal device being moved to the second net
Network, the second network can support the voice service of ps domain；Processing unit 2901 is also used to set by Transmit-Receive Unit 2902 to terminal
Preparation send the first instruction information, and the voice service that the first instruction information is used to indicate ps domain is supported.
Optionally, the core net of first network and the second network is identical, and access standard is different；Alternatively, first network and
The core net and access standard of two networks are different.
Optionally, first network is supported terminal device being moved to the second network, comprising: the first access in first network
Net equipment is supported when receiving from the first session management information of session management network element, and terminal device is accessed the second net
Network, the first session management information are used to request to establish user face tunnel for the voice service of terminal device.
Optionally, third condition further include: switching interoperability is supported between first network and the second network.
Optionally, switching interoperability is supported between first network and the second network, comprising: first network and the second network it
Between exist switching interworkng interface.
Optionally, processing unit 2901 is also used to determine that terminal device is the terminal device based on voice service.
Optionally, instruction information of the carried terminal equipment for the terminal device based on voice service, place in registration request
Reason unit 2901 is specifically used for determining that terminal device is the terminal device based on voice service according to registration request.
Optionally, processing unit 2901 is also used to determine that terminal device is supported during voice service is initiated from the first net
Network is moved to the second network and continues the initiation process of voice service by the second network.
Optionally, carried terminal equipment is gone back in registration request to support during voice service is initiated from first network movement
Continue the instruction information of the initiation process of voice service to the second network and by the second network, processing unit 2901 is specifically used for
Determine that terminal device is supported to be moved to the second network during voice service is initiated from first network and lead to according to registration request
Cross the initiation process that the second network continues voice service.
No matter whether first network supports the voice service of terminal device, initiates as long as first network has in terminal device
The terminal device is fallen after rise to the ability for the network that can provide voice service by switching or other modes when voice service, then is existed
When the terminal device is registered to first network, the voice service of first movement managed network element just instruction terminal equipment ps domain is propped up
It holds, so that guaranteeing that terminal device is registered and resides in first network saves Internet resources without reselecting to other networks, and protects
Card terminal device normally executes ps domain voice service register flow path by first network and initiates ps domain audio call process.
The embodiment of the present application also provides a kind of terminal device 290A, referring to fig. 2 9A, including processing unit 2901A and receipts
Bill member 2902A.Processing unit 2901A is for generating registration request, and registration request is for requesting for terminal device to be registered in the
One network, carried terminal equipment is the instruction information of the terminal device based on voice service in registration request；Processing unit
2901A is also used to send registration request to first movement managed network element by Transmit-Receive Unit 2902A.
It optionally, further include that terminal device is supported during voice service is initiated from first network movement in registration request
Continue the instruction information of the initiation process of voice service to the second network and by the second network.
Optionally, the core net of first network and the second network is identical, and access standard is different；Alternatively, first network and
The core net and access standard of two networks are different.
Have in first network and passes through switching or other modes when terminal device initiates voice service for the terminal device
Fall after rise to the network that voice service can be provided ability when, terminal device according to receive first movement managed network element transmission
The first instruction information, register and reside in first network and save Internet resources without reselecting to other networks, and guarantee end
End equipment normally executes ps domain voice service register flow path by first network and initiates ps domain audio call process.
The embodiment of the present application also provides a kind of network equipments, comprising: memory, processor and communication interface；Memory
For storing computer executed instructions, processor executes the computer executed instructions of memory storage, and is made by communication interface
It obtains the network equipment and realizes the corresponding method of instruction.The structural schematic diagram of the network equipment may refer to Fig. 6.
The network equipment can connect for the first access network equipment, session management network element, the second mobile management network element, second
Log equipment, IMS network element or first movement managed network element.Specifically, working as is the first access network equipment shown in Fig. 6 and Figure 29
Schematic diagram when, processing unit 2901 can be processor 601, Transmit-Receive Unit 2902 can be communication interface 604；As Fig. 6 and
When being the schematic diagram of session management network element shown in Figure 29, processing unit 2901 can be processor 601, and Transmit-Receive Unit 2902 can
Think communication interface 604；When being the schematic diagram of the second mobile management network element shown in Fig. 6 and Figure 29, processing unit 2901
It can be processor 601, Transmit-Receive Unit 2902 can be communication interface 604；It is set for the second access net shown in Fig. 6 and Figure 29
When standby schematic diagram, processing unit 2901 can be processor 601, and Transmit-Receive Unit 2902 can be communication interface 604；Work as Fig. 6
When with being the schematic diagram of IMS network element shown in Figure 29, processing unit 2901 can be processor 601, and Transmit-Receive Unit 2902 can be with
For communication interface 604；When being the schematic diagram of first movement managed network element shown in Fig. 6 and Figure 29, processing unit 2901 can
Think that processor 601, Transmit-Receive Unit 2902 can be communication interface 604.
The embodiment of the present application also provides a kind of terminal devices, comprising: memory, processor and communication interface；Memory
For storing computer executed instructions, processor executes the computer executed instructions of memory storage, and is made by communication interface
It obtains terminal device and realizes the corresponding method of instruction.The structural schematic diagram of terminal device may refer to Fig. 6 A.Processing unit 2901A can
Think that processor 601A, Transmit-Receive Unit 2902A can be communication interface 604A.
The embodiment of the present application also provides a kind of computer readable storage mediums, including instruction, when it is transported on computers
When row, so that computer executes the above method.
The embodiment of the present application also provides a kind of computer program products comprising instruction, when it runs on computers
When, so that computer executes the above method.
In the above-described embodiments, can come wholly or partly by software, hardware, firmware or any combination thereof real
It is existing.When being realized using software program, can entirely or partly realize in the form of a computer program product.The computer
Program product includes one or more computer instructions.On computers load and execute computer program instructions when, all or
It partly generates according to process or function described in the embodiment of the present application.The computer can be general purpose computer, dedicated meter
Calculation machine, computer network or other programmable devices.The computer instruction can store in computer readable storage medium
In, or from a computer readable storage medium to the transmission of another computer readable storage medium, for example, the computer
Instruction can pass through wired (such as coaxial cable, optical fiber, number from a web-site, computer, server or data center
Word user line (digital subscriber line, abbreviation DSL)) or wireless (such as infrared, wireless, microwave etc.) mode to
Another web-site, computer, server or data center are transmitted.The computer readable storage medium can be meter
Any usable medium that calculation machine can access either includes server, the data center that one or more can use medium to integrate
Equal data storage devices.The usable medium can be magnetic medium (for example, floppy disk, hard disk, tape), optical medium (for example,
) or semiconductor medium (such as solid state hard disk (solid state disk, abbreviation SSD)) etc. DVD.
Although the application is described in conjunction with each embodiment herein, however, implementing the application claimed
In the process, those skilled in the art are by checking the attached drawing, disclosure and the appended claims, it will be appreciated that and it is real
Other variations of the existing open embodiment.In the claims, " comprising " (comprising) word is not excluded for other compositions
Part or step, "a" or "an" are not excluded for multiple situations.Claim may be implemented in single processor or other units
In several functions enumerating.Mutually different has been recited in mutually different dependent certain measures, it is not intended that these are arranged
It applies to combine and generates good effect.
Although the application is described in conjunction with specific features and embodiment, it is clear that, do not departing from this Shen
In the case where spirit and scope please, it can be carry out various modifications and is combined.Correspondingly, the specification and drawings are only institute
The exemplary illustration for the application that attached claim is defined, and be considered as covered within the scope of the application any and all and repair
Change, change, combining or equivalent.Obviously, those skilled in the art the application can be carried out various modification and variations without
It is detached from spirit and scope.If in this way, these modifications and variations of the application belong to the claim of this application and its
Within the scope of equivalent technologies, then the application is also intended to include these modifications and variations.
Claims (25)
1. a kind of network registering method characterized by comprising
Mobile management network element receives registration request from terminal device, and the registration request infuses the terminal device for requesting
Volume is in first network；
If third condition set up, the mobile management network element to the terminal device send first instruction information, described first
The voice service that instruction information is used to indicate packet switched ps domain is supported, wherein the third condition includes: first net
Network is supported the terminal device being moved to the second network.
2. the method according to claim 1, wherein the core net phase of the first network and second network
Together, access standard is different.
3. the method according to claim 1, wherein the core net of the first network and second network and
It is different to access standard.
4. method described in any one of -3 according to claim 1, which is characterized in that the first network was supported the end
End equipment is moved to second network, comprising:
The first access network equipment support in the first network is receiving the session management information from session management network element
When, the terminal device is accessed into second network, the session management information is used to request the language for the terminal device
Sound business establishes user face tunnel.
5. method described in any one of -4 according to claim 1, which is characterized in that the third condition further include: described
Switching interoperability is supported between first network and second network.
6. method described in any one of -5 according to claim 1, which is characterized in that the third condition further include: described
Second network can support the voice service of ps domain.
7. according to the method described in claim 5, it is characterized in that, supporting to cut between the first network and second network
Change interoperability, comprising: there is switching interworkng interface between the first network and second network.
8. method according to any one of claims 1-7, which is characterized in that in the mobile management network element to institute
Before stating terminal device transmission the first instruction information, the method also includes:
The mobile management network element determines that the terminal device is the terminal device based on voice service.
9. according to the method described in claim 8, it is characterized in that, carrying the terminal device in the registration request is with language
The instruction information of terminal device based on sound business,
The mobile management network element determines that the terminal device is the terminal device based on voice service, comprising:
The mobile management network element determines that the terminal device is the terminal based on voice service according to the registration request
Equipment.
10. a kind of network registering method characterized by comprising
Terminal device generates registration request, and the terminal device is registered in first network for requesting by the registration request, institute
State the instruction information for carrying that the terminal device is the terminal device based on voice service in registration request；
The terminal device sends the registration request to mobile management network element.
11. according to the method described in claim 10, it is characterized in that, the method also includes:
The terminal device receives the first instruction information that the mobile management network element is sent, and the first instruction information is used for
Indicate that the voice service of packet switched ps domain is supported；
The terminal device initiates ps domain audio call process according to the first instruction information.
12. a kind of network equipment characterized by comprising Transmit-Receive Unit, for receiving registration request from terminal device, wherein
The terminal device is registered in first network for requesting by the registration request；
Processing unit, for determining that third condition is set up, wherein the third condition includes: that the first network is supported institute
It states terminal device and is moved to the second network；
The Transmit-Receive Unit is also used to send the first instruction information to the terminal device, and the first instruction information is used to indicate
The voice service of ps domain is supported.
13. the network equipment according to claim 12, which is characterized in that the core of the first network and second network
Heart net is identical, and access standard is different.
14. the network equipment according to claim 12, which is characterized in that the core of the first network and second network
Heart net and access standard are different.
15. the network equipment described in any one of 2-14 according to claim 1, which is characterized in that the first network is supported
The terminal device is moved to second network, comprising:
The first access network equipment support in the first network is receiving the session management information from session management network element
When, the terminal device is accessed into second network, the session management information is used to request the language for the terminal device
Sound business establishes user face tunnel.
16. the network equipment described in any one of 2-15 according to claim 1, which is characterized in that the third condition is also wrapped
It includes: supporting switching interoperability between the first network and second network.
17. the network equipment described in any one of 2-16 according to claim 1, which is characterized in that the third condition is also wrapped
Include: second network can support the voice service of ps domain.
18. the network equipment according to claim 16, which is characterized in that between the first network and second network
Support switching interoperability, comprising: there is switching interworkng interface between the first network and second network.
19. the network equipment described in any one of 2-18 according to claim 1, which is characterized in that the processing unit is also used
In determining that the terminal device is terminal device based on voice service.
20. the network equipment according to claim 19, which is characterized in that carry the terminal device in the registration request
For the instruction information of the terminal device based on voice service,
The processing unit is used to determine that the terminal device sets for the terminal based on voice service according to the registration request
It is standby.
21. a kind of terminal device characterized by comprising
Processing unit, for generating registration request, the terminal device is registered in the first net for requesting by the registration request
Network carries the instruction information that the terminal device is the terminal device based on voice service in the registration request；
Transmit-Receive Unit, for sending the registration request to mobile management network element.
22. terminal device according to claim 21, which is characterized in that the Transmit-Receive Unit is also used to receive the movement
Property managed network element send first instruction information, according to it is described first instruction information initiate ps domain audio call process, wherein institute
It states the first instruction information and is used to indicate the voice service of packet switched ps domain and be supported.
23. a kind of network equipment, comprising:
Memory, for storing computer executed instructions；
Processor, for executing the computer executed instructions of memory storage, so that the network equipment executes such as claim 1
To method described in any one of 9.
24. a kind of terminal device, comprising:
Memory, for storing computer executed instructions；
Processor, for executing the computer executed instructions of memory storage, so that the terminal device executes such as claim
Method described in 10 or 11.
25. a kind of computer readable storage medium, including instruction, when run on a computer, so that computer executes such as
Method described in any one of claim 1 to 9 or 10-11.
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| CN201810602051.XA Active CN109257788B (en) | 2017-07-14 | 2017-08-14 | Network switching method and device |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2019011107A1 (en) | 2019-01-17 |
| CN109257788B (en) | 2021-06-22 |
| CN109041149B (en) | 2020-01-03 |
| CN109257788A (en) | 2019-01-22 |
| CN109257780B (en) | 2021-06-01 |
| CN109257780A (en) | 2019-01-22 |
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