CN106804051A - The method and system of VoLTE and VoWiFi switchings - Google Patents
The method and system of VoLTE and VoWiFi switchings Download PDFInfo
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- CN106804051A CN106804051A CN201611263917.6A CN201611263917A CN106804051A CN 106804051 A CN106804051 A CN 106804051A CN 201611263917 A CN201611263917 A CN 201611263917A CN 106804051 A CN106804051 A CN 106804051A
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
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Abstract
Present invention is disclosed the method and system that a kind of VoLTE and VoWiFi switches, changing method is comprised the following steps：UE initiates the request message switched between VoLTE networks and VoWiFi networks；Wherein, VoLTE networks preserve the carrying information of the VoLTE networks for pre-building, VoWiFi networks preserve the carrying information of the VoLTE networks for pre-building；When request message is from VoWiFi network switchings to VoLTE networks, UE is linked into VoLTE networks according to the carrying information of the VoLTE networks for pre-building；When request message is from VoLTE network switchings to VoWiFi networks, UE is linked into VoWiFi networks according to the carrying information of the VoWiFi networks for pre-building.Continuity is good during switching, and business originally will not be interrupted.
Description
Technical field
The present invention relates to VoLTE and VoWiFi switchings field, the method for especially relating to VoLTE and VoWiFi switchings
And system.
Background technology
The network that existing UE is generally accessed is VoLTE networks or VoWiFi networks, due to the influence of the factors such as signal intensity, is had
When need to network switching；After UE is switched in the prior art, network side can delete the carrying information for establishing, thus when under UE
When once needing to switch the link of last time access, because carrying information is deleted, thus the switching of UE needs wait carrying information
Setting up again to switch successfully so that handoff procedure is discontinuous, and the time of consuming is also more long, and the process of switching is present discontinuously
Property, the business before switching can be interrupted, and cause inconvenience.
The content of the invention
The main object of the present invention be provide it is a kind of after handover network before the business VoLTE and VoWiFi that will not interrupt
The method and system of switching.
The method that the present invention proposes a kind of VoLTE and VoWiFi switchings, including：
UE initiates the request message switched between VoLTE networks and VoWiFi networks；Wherein, VoLTE networks are protected
There is the carrying information of the VoLTE networks for pre-building, VoWiFi networks preserve the carrying letter of the VoLTE networks for pre-building
Breath；
When request message is from VoWiFi network switchings to VoLTE networks, UE is according to the VoLTE networks for pre-building
Carrying information is linked into VoLTE networks；
When request message is from VoLTE network switchings to VoWiFi networks, UE is according to the VoWiFi networks for pre-building
Carrying information be linked into VoWiFi networks.
Further, in certain embodiments, what UE initiations were switched between VoLTE networks and VoWiFi networks please
Ask and also include before message：
Detect the signal strength indication value of current VoLTE networks and VoWiFi networks；
Compare the size of the signal strength indication value of VoLTE networks and the signal strength indication value of VoWiFi networks, obtain
The larger network of signal strength indication value；
Whether the network that judgement is currently accessed is the larger network of signal strength indication value, if it is not, then UE is switched over.
Further, in further embodiments, the UE initiates to be cut between VoLTE networks and VoWiFi networks
Also include before the request message changed：
Obtain the signal strength indication value of present access network；
The signal strength indication value of access network is compared with default signal strength indication value, if being less than default signal
Strength indicator value, then judge that UE is switched over.
Further, when request message is that from VoWiFi network switchings to VoLTE networks, then UE is according to pre-building
The carrying information of VoLTE networks also includes before being linked into VoLTE networks：
Initiate to obtain the request of PGW information to MME；
Receive the PGW information for pre-saving that MME is obtained from HSS；
The carrying information of VoLTE networks is obtained from PGW information.
Further, when request message is that from VoLTE network switchings to VoWiFi networks, then UE is according to pre-building
The carrying information of VoWiFi networks is linked into VoWiFi networks to be included：
Initiate to obtain the request of PGW information to ePDG；
Receive the PGW information for pre-saving that the ePDG is obtained from HSS；
The carrying information of VoWiFi networks is obtained from PGW information.
The system of VoLTE of the present invention and VoWiFi switchings, including switching initiation module, the first handover module and the second switching
Module；
Switching initiation module, for the request message that UE initiates to be switched between VoLTE networks and VoWiFi networks；
Wherein, VoLTE networks preserve the carrying information of the VoLTE networks for pre-building, VoWiFi networks preserve what is pre-build
The carrying information of VoLTE networks；
First handover module, for when the request message is from VoWiFi network switchings to VoLTE networks, UE according to
The carrying information of the VoLTE networks for pre-building is linked into VoLTE networks；
Second handover module, for when request message is from VoLTE network switchings to VoWiFi networks, UE to be according in advance
The carrying information of the VoWiFi networks of foundation is linked into VoWiFi networks.
Further, also including signal detection module, signal comparison module and the first judge module；
Signal detection module, the signal strength indication value for detecting current VoLTE networks and VoWiFi networks；
Signal comparison module, for comparing the signal strength indication value of VoLTE networks and the signal intensity of VoWiFi networks
The size of indicated value, obtains the larger network of signal strength indication value；
First judge module, whether the network for judging to be currently accessed is the larger network of signal strength indication value, if
No, then UE is switched over.
Further, also including current demand signal detection module and the second judge module；
Current demand signal detection module, the signal strength indication value for obtaining present access network；
Second judge module, for by the signal strength indication value of access network and default signal strength indication value ratio
Compared with if less than default signal strength indication value, judging that UE is switched over.
Further, also including the first request module, a PGW extraction modules and a VoLTE data obtaining modules；
First request module, for initiating to obtain the request of PGW information to MME；
First PGW extraction modules, for receiving the PGW information for pre-saving that MME is obtained from HSS；
First VoLTE data obtaining modules, the carrying information for obtaining VoLTE networks from PGW information.
Further, also including the second request module, the 2nd PGW extraction modules and a VoWiFi data obtaining modules；
Second request module, for initiating to obtain the request of PGW information to ePDG；
2nd PGW extraction modules, for receiving the PGW information for pre-saving that ePDG is obtained from HSS；
First VoWiFi data obtaining modules, the carrying information for obtaining VoWiFi networks from PGW information.
In the method and system that VoLTE of the present invention and VoWiFi switches, the mistake continuity of switching is good, is realizing
After VoLTE and VoWiFi switchings, the business that the network for accessing before is carried out will not be interrupted, enhanced convenience, be connected quicker；
When running into work at present network and interrupting suddenly, another network insertion can be switched at once for job network, can also be just
Often work.
Brief description of the drawings
The step of Fig. 1 is the method for VoLTE of the present invention and VoWiFi switchings schematic diagram；
Fig. 2 is the step schematic diagram in a specific embodiment of the method for VoLTE of the present invention and VoWiFi switchings；
Fig. 3 is the step schematic diagram in the another specific embodiment of the method for VoLTE of the present invention and VoWiFi switchings；
Fig. 4 is the structural representation of the embodiment of system one of VoLTE of the present invention and VoWiFi switchings；
Fig. 5 is the structural representation of the specific embodiment of system one of VoLTE of the present invention and VoWiFi switchings；
Fig. 6 is the structural representation of the system another specific embodiment of VoLTE of the present invention and VoWiFi switchings.
The realization of the object of the invention, functional characteristics and advantage will be described further referring to the drawings in conjunction with the embodiments.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
Reference picture 1 a, embodiment of the method for VoLTE of the present invention and VoWiFi switchings, comprises the following steps：
S1, UE initiate the request message switched between VoLTE networks and VoWiFi networks；Wherein, VoLTE networks
The carrying information of the VoLTE networks for pre-building is preserved, VoWiFi networks preserve the carrying of the VoLTE networks for pre-building
Information；
S2, when request message is from VoWiFi network switchings to VoLTE networks, UE is according to the VoLTE nets for pre-building
The carrying information of network is linked into VoLTE networks；
S3, when request message is from VoLTE network switchings to VoWiFi networks, UE is according to the VoWiFi nets for pre-building
The carrying information of network is linked into VoWiFi networks.
In the method that VoLTE of the present invention and VoWiFi switch, due in switching every time, all using pre-building
Carrying information is accessed, and can realized after VoLTE and VoWiFi switchings, and the business that the network for accessing before is carried out will not
Interrupt, continuity is strong, enhanced convenience, greatly save the time of switching, connect quicker；When running into work at present network
When interrupting suddenly, another network insertion can be switched at once for job network, can be with normal work.
It is understood that first time access VoLTE networks and for the first time access VoWiFi networks when, set up UE and
The carrying information of network side.When generation is switched, after UE is switched in the prior art, network side can delete the carrying letter for establishing
Breath, thus when UE need next time switch last time access link when, due to carrying information be deleted, thus UE switching need
Carrying information is waited to set up could switch successfully again so that handoff procedure is discontinuous, and the time of consuming is also more long.And in this Shen
Please embodiment switch when, the carrying information that above-mentioned UE sets up at first time access network (VoLTE networks or VoWiFi networks)
Can be kept, therefore in handoff procedure each time afterwards, UE can believe according to the carrying of the VoLTE networks for pre-building
Breath is linked into VoLTE networks, or, UE is linked into VoWiFi networks according to the carrying information of the VoWiFi networks for pre-building.
In the present embodiment, the carrying information of the VoLTE networks for pre-building is accessed what VoLTE networks and network side were set up by UE first
Carrying information；The carrying information of the VoWiFi networks for pre-building is accessed what VoWiFi networks and network side were set up by UE first
Carrying information.
In above-mentioned steps S1, UE is (user equipment, User Equipment), and UE can be mobile phone, bracelet and flat board electricity
Brain etc.；VoWiFi networks are energy carry voice traffic WiFi network；VoLTE networks are energy carry voice traffic LTE network；Step
S1 initiates handover request, opens handoff procedure.
In above-mentioned steps S2, UE directly receives the carrying information of the VoLTE networks for pre-building, is accessing VoLTE networks
When, more smooth, access speed is faster.When VoLTE networks are linked into, VoLTE networks can be identified being main job network,
VoWiFi networks are then identified as back-up job network.
In above-mentioned steps S3, UE directly receives the carrying information of the VoWiFi networks for pre-building, is accessing VoLTE networks
When, more smooth, access speed is faster.When VoWiFi networks are linked into, VoWiFi networks can be identified being main job network,
VoLTE networks are then identified as back-up job network.
Reference picture 2, in certain embodiments, what UE initiations were switched between VoLTE networks and VoWiFi networks please
Ask and also comprise the following steps before message：
S11, the signal strength indication value for detecting current VoLTE network signal intensities indicated value and VoWiFi networks；
The size of the signal strength indication value of S12, the signal strength indication value for comparing VoLTE networks and VoWiFi networks,
Obtain the larger network of signal strength indication value；
Whether the network that S13, judgement are currently accessed is the larger network of signal strength indication value, if it is not, then UE is cut
Change.
In above-mentioned steps S11, signal strength indication value refer to the currently received VoLTE networks of UE signal strength values and
The signal strength values of the currently received VoWiFi networks of UE.
In above-mentioned steps S12, the signal strength indication value and the signal intensity of VoWiFi networks for comparing VoLTE networks refer to
The size of indicating value is compared by processor in UE according to the signal intensity of detection.
In above-mentioned steps S13, when whether the network that is currently accessed of judgement is signal strength indication value larger network,
If in the case of, the network for now accessing is constant.
The condition that satisfaction is switched between VoLTE networks and VoWiFi networks is triggered by step S11, S12 and S13,
When the conditions are met, UE can just initiate the request message switched between VoLTE networks and VoWiFi networks.
Reference picture 3, in further embodiments, UE initiates what is switched between VoLTE networks and VoWiFi networks
Also comprise the following steps before request message：
S14, the signal strength indication value for obtaining present access network；
S15, the signal strength indication value of access network is compared with default signal strength indication value, if less than default
Signal strength indication value, then judge that UE is switched over.
In above-mentioned steps S14, signal strength indication value refer to the currently received VoLTE networks of UE signal strength values or
The signal strength values of the currently received VoWiFi networks of UE.
In above-mentioned steps S15, default signal strength indication value is the prior threshold value for setting, currently to be received with UE
The signal strength values of VoLTE networks or the signal strength values of the currently received VoWiFi networks of UE be compared, and to compare
Result is decision condition.
In above-mentioned steps S15, the signal strength indication value of access network is compared with default signal strength indication value,
If during more than or equal to default signal strength indication value, maintaining present access network constant.
The condition that satisfaction is switched between VoLTE networks and VoWiFi networks is triggered by step S14 and S15, works as bar
When part meets, UE can just initiate the request message switched between VoLTE networks and VoWiFi networks.
Reference picture 2-3, before above-mentioned steps S2, also including step：
S21, the request that acquisition PGW information is initiated to MME；
The PGW information for pre-saving that S22, reception MME are obtained from HSS；
S23, from PGW information obtain VoLTE networks carrying information.
In above-mentioned steps S21, UE initiates to obtain the request of PGW information to MME.Wherein MME (Mobility
Management Entity) it is the key control node of 3GPP agreement LTE access networks.
In above-mentioned steps S22, the PGW information for pre-saving that MME is obtained from HSS is received.Wherein PGW information is advance
The PGW information of the VoLTE networks of foundation.Wherein HSS is (server home signature user server, Home Subscriber
Server)；PGW (PDN Gateway, PDN GateWay) is the network element of mobile communications network.
In above-mentioned steps S23, the carrying information of VoLTE networks is obtained from PGW information.By above-mentioned steps S21,
S22 and S22 obtain the carrying information of the VoLTE networks for pre-building, UE is accessed VoLTE networks according to pre-building
Path enters, and network switching is continuous, does not have interim card, and business originally will not also be interrupted.
Reference picture 2-3, before above-mentioned steps S3, also including step：
S31, the request that acquisition PGW information is initiated to ePDG；
The PGW information for pre-saving that S32, the reception ePDG are obtained from HSS；
S33, from PGW information obtain VoWiFi networks carrying information.
In above-mentioned steps S31, UE initiates to obtain the request of PGW information to ePDG, and wherein ePDG is evolution grouped data
Gateway.
In above-mentioned steps S32, UE receives the PGW information for pre-saving that the ePDG is obtained from HSS.
In above-mentioned steps S33, UE obtains the carrying information of VoWiFi networks from PGW information.
The carrying information of the VoWiFi networks for pre-building is obtained by above-mentioned steps S31, S32 and S32, UE is accessed
VoWiFi networks can enter according to the path that pre-builds, and network switching is continuous, not have an interim card, original business also will not in
It is disconnected.
Reference picture 4, the system of VoLTE of the present invention and VoWiFi switchings, including switching initiation module 1, the first handover module 2
With the second handover module 3；
Switching initiation module 1, the request for initiating to be switched between VoLTE networks and VoWiFi networks for UE disappears
Breath；Wherein, VoLTE networks preserve the carrying information of the VoLTE networks for pre-building, VoWiFi networks are preserved and pre-build
VoLTE networks carrying information；
First handover module 2, for when the request message is from VoWiFi network switchings to VoLTE networks, UE roots
VoLTE networks are linked into according to the carrying information of the VoLTE networks for pre-building；
Second handover module 3, for when request message is from VoLTE network switchings to VoWiFi networks, UE to be according to pre-
The carrying information of the VoWiFi networks first set up is linked into VoWiFi networks.
In above-mentioned switching initiation module 1, the terminal that UE is used for user can be mobile phone, bracelet and panel computer etc.；
VoWiFi networks are energy carry voice traffic WiFi network；VoLTE networks are energy carry voice traffic LTE network.
In above-mentioned first handover module 2, the carrying information of the VoLTE networks for pre-building is directly received, accessing VoLTE
More smooth during network, access speed is faster.When VoLTE networks are linked into, VoLTE networks can be identified being main working net
Network, VoWiFi networks are then identified as back-up job network.
In above-mentioned second handover module 3, the carrying information of the VoWiFi networks for pre-building is directly received, accessed
More smooth during VoLTE networks, access speed is faster.When VoWiFi networks are linked into, based on VoWiFi networks can be identified
Job network, VoLTE networks are then identified as back-up job network.
Reference picture 5, in one embodiment, the system of VoLTE and VoWiFi switchings also includes signal detection module 11, signal
The judge module 13 of comparison module 12 and first；
Signal detection module 11, the signal strength indication value for detecting current VoLTE networks and VoWiFi networks；
Signal comparison module 12, the signal strength indication value for comparing VoLTE networks is strong with the signal of VoWiFi networks
The size of indicated value is spent, the larger network of signal strength indication value is obtained；
First judge module 13, whether the network for judging to be currently accessed is the larger network of signal strength indication value,
If it is not, then UE is switched over.
In above-mentioned signal detection module 11, signal strength indication value refers to the signal of the currently received VoLTE networks of UE
The signal intensity of strength values and the currently received VoWiFi networks of UE.
In above-mentioned signal comparison module 12, compare the signal strength indication value of VoLTE networks and the letter of VoWiFi networks
The size of number strength indicator value is compared by processor in UE according to the signal intensity of detection.
In above-mentioned first judge module 13, whether the network that judgement is currently accessed is the larger net of signal strength indication value
During network, if in the case of, the network for now accessing is constant.
By signal detection module 11,12 and first judge module of signal comparison module 13 judge triggering VoLTE networks and
The condition of satisfaction is switched between VoWiFi networks, when the conditions are met, UE can be just initiated in VoLTE networks and VoWiFi nets
The request message switched between network.
Reference picture 6, the system of VoLTE and VoWiFi switchings also includes current demand signal detection module in another embodiment
14 and second judge module 15；
Current demand signal detection module 14, the signal strength indication value for obtaining present access network；
Second judge module 15, for by the signal strength indication value of access network and default signal strength indication value ratio
Compared with if less than default signal strength indication value, judging that UE is switched over.
In above-mentioned current demand signal detection module 14, signal strength indication value refers to the currently received VoLTE networks of UE
The signal intensity of signal intensity numerical value or the currently received VoWiFi networks of UE.
In above-mentioned second judge module 15, default signal strength indication value is the prior threshold value for setting, to UE
The signal intensity of the currently received VoWiFi networks of signal intensity numerical value or UE of currently received VoLTE networks is compared,
And with comparative result as decision condition.
In above-mentioned second judge module 15, the signal strength indication value of access network is indicated with default signal intensity
Value compares, if be more than or equal to default signal strength indication value, maintains present access network constant.
Trigger to enter between VoLTE networks and VoWiFi networks by 14 and second judge module of current demand signal detection module 15
The condition that row switching meets, when the conditions are met, UE can just initiate to be switched between VoLTE networks and VoWiFi networks
Request message.
The system of reference picture 5-6, VoLTE and VoWiFi switching also includes the first request module 21, a PGW extraction modules
22 and VoLTE data obtaining modules 23；
First request module 21, for initiating to obtain the request of PGW information to MME；
First PGW extraction modules 22, for receiving the PGW information for pre-saving that MME is obtained from HSS；
First VoLTE data obtaining modules 23, the carrying information for obtaining VoLTE networks from PGW information.
In above-mentioned first request module 21, UE initiates to obtain the request of PGW information to MME.
In an above-mentioned PGW extraction modules 22, the PGW information for pre-saving that MME is obtained from HSS is received.Wherein PGW
Information is the PGW information of the VoLTE networks for pre-building.
In an above-mentioned VoLTE data obtaining modules 23, the carrying information of VoLTE networks is obtained from PGW information.
Obtained by above-mentioned first request module 21, a PGW extraction modules 22 and a VoLTE data obtaining modules 23
The carrying information of the VoLTE networks for pre-building, enables UE to access VoLTE networks and enters according to the path for pre-building, net
Network switching is continuous, does not have interim card, and business originally will not also be interrupted.
The system of reference picture 5-6, VoLTE and VoWiFi switching also includes the second request module 31, the 2nd PGW extraction modules
32 and VoWiFi data obtaining modules 33；
Second request module 31, for initiating to obtain the request of PGW information to ePDG；
2nd PGW extraction modules 32, for receiving the PGW information for pre-saving that ePDG is obtained from HSS；
First VoWiFi data obtaining modules 33, the carrying information for obtaining VoWiFi networks from PGW information.
In above-mentioned second request module 31, UE initiates to obtain the request of PGW information to ePDG.
In above-mentioned 2nd PGW extraction modules 32, UE receives the PGW information for pre-saving that the ePDG is obtained from HSS.
In an above-mentioned VoWiFi data obtaining modules 33, UE obtains the carrying letter of VoWiFi networks from PGW information
Breath.
Obtained by above-mentioned second request module 31, the 2nd PGW extraction modules 32 and a VoWiFi data obtaining modules 33
The carrying information of the VoWiFi networks that must be pre-build, enables UE to access VoWiFi networks and enters according to the path for pre-building
Enter, network switching is continuous, does not have interim card, and business originally will not also be interrupted.
Reference picture 5, the embodiment of system one of VoLTE of the present invention and VoWiFi switchings, including switching initiation module 1, first
Handover module 2, the second handover module 3, signal detection module 11, signal comparison module 12, the first judge module 13, first are asked
Module 21, a PGW extraction modules 22, a VoLTE data obtaining modules 23, the second request module 31, the 2nd PGW extract mould
The VoWiFi data obtaining modules 33 of block 32 and the；The system switched by VoLTE shown in Fig. 5 and VoWiFi, can be continuous
Realize VoLTE networks and the internetwork switchings of VoWiFi.
Reference picture 6, the embodiment of system one of VoLTE of the present invention and VoWiFi switchings, including switching initiation module 1, first
Handover module 2, the second handover module 3, the judge module 15 of current demand signal detection module 14 and second, the first request module 21,
One PGW extraction modules 22, a VoLTE data obtaining modules 23, the second request module 31, the 2nd PGW extraction modules 32 and
One VoWiFi data obtaining modules 33；The system switched by VoLTE shown in Fig. 6 and VoWiFi, can continuously realize VoLTE
Network and the internetwork switchings of VoWiFi.
In the method and system that VoLTE of the present invention and VoWiFi switches, the mistake continuity of switching is good, is realizing
After VoLTE and VoWiFi switchings, the business that the network for accessing before is carried out will not be interrupted, enhanced convenience, be connected quicker；
When running into work at present network and interrupting suddenly, another network insertion can be switched at once for job network, can also be just
Often work.
The preferred embodiments of the present invention are the foregoing is only, the scope of the claims of the invention, every utilization is not thereby limited
Equivalent structure or equivalent flow conversion that description of the invention and accompanying drawing content are made, or directly or indirectly it is used in other correlations
Technical field, be included within the scope of the present invention.
Claims (10)
1. the method that a kind of VoLTE and VoWiFi switches, it is characterised in that including：
UE initiates the request message switched between VoLTE networks and VoWiFi networks；Wherein, the VoLTE networks are protected
There is a carrying information of the VoLTE networks for pre-building, the VoWiFi networks preserve holding for the VoLTE networks that pre-build
Information carrying ceases；
When the request message is from the VoWiFi network switchings to the VoLTE networks, the UE is according to described advance
The carrying information of the VoLTE networks of foundation is linked into the VoLTE networks；
When the request message is from the VoLTE network switchings to the VoWiFi networks, the UE is according to described advance
The carrying information of the VoWiFi networks of foundation is linked into the VoWiFi networks.
2. the method that VoLTE according to claim 1 and VoWiFi switches, it is characterised in that the UE is initiated in VoLTE
Also include before the request message switched between network and VoWiFi networks：
Detect the signal strength indication value of current VoLTE networks and the signal strength indication value of VoWiFi networks；
Compare the signal strength indication value of the VoLTE networks and the size of the signal strength indication value of the VoWiFi networks,
Obtain the larger network of signal strength indication value；
Whether the network that judgement is currently accessed is the larger network of the signal strength indication value, if it is not, then switching over.
3. the method that VoLTE according to claim 1 and VoWiFi switches, it is characterised in that the UE is initiated in VoLTE
Also include before the request message switched between network and VoWiFi networks：
Obtain the signal strength indication value of present access network；
The signal strength indication value of the access network is compared with default signal strength indication value, if being less than default signal
Strength indicator value, then judge that UE is switched over.
4. the method that VoLTE according to claim 1 and VoWiFi switches, it is characterised in that described when the request disappears
Breath be from the VoWiFi network switchings to the VoLTE networks, then the VoLTE networks that the UE pre-builds according to
Carrying information also includes before being linked into the VoLTE networks：
Initiate to obtain the request of PGW information to MME；
Receive the PGW information for pre-saving that the MME is obtained from HSS；
The carrying information of the VoLTE networks is obtained from the PGW information.
5. the method that VoLTE according to claim 1 and VoWiFi switches, it is characterised in that described when the request disappears
Breath is the VoWiFi networks that then UE pre-builds according to from the VoLTE network switchings to the VoWiFi networks
Carrying information be linked into the VoWiFi networks before also include：
Initiate to obtain the request of PGW information to ePDG；
Receive the PGW information for pre-saving that the ePDG is obtained from HSS；
The carrying information of the VoWiFi networks is obtained from the PGW information.
6. the system that a kind of VoLTE and VoWiFi switches, it is characterised in that including：
Switching initiation module, for the request message for initiating to be switched between VoLTE networks and VoWiFi networks；Wherein,
The VoLTE networks preserve the carrying information of the VoLTE networks for pre-building, the VoWiFi networks are preserved and pre-build
VoLTE networks carrying information；
First handover module, for when the request message is from the VoWiFi network switchings to the VoLTE networks, root
The VoLTE networks are linked into according to the carrying information of the VoLTE networks for pre-building；
Second handover module, for when the request message is from the VoLTE network switchings to the VoWiFi networks, root
The VoWiFi networks are linked into according to the carrying information of the VoWiFi networks for pre-building.
7. the system that VoLTE according to claim 6 and VoWiFi switches, it is characterised in that also include：
Signal detection module, the signal intensity for detecting current VoLTE network signal intensities indicated value and VoWiFi networks refers to
Indicating value；
Signal comparison module, for comparing the signal strength indication value of the VoLTE networks and the signal of the VoWiFi networks
The size of strength indicator value, obtains the larger network of signal strength indication value；
First judge module, whether the network for judging to be currently accessed is the larger network of the signal strength indication value, if
It is no, then switch over.
8. the system that VoLTE according to claim 6 and VoWiFi switches, it is characterised in that also include:
Current demand signal detection module, the signal strength indication value for obtaining present access network；
Second judge module, for by the signal strength indication value of the access network and default signal strength indication value ratio
Compared with if less than default signal strength indication value, judging that UE is switched over.
9. the system that VoLTE according to claim 8 and VoWiFi switches, it is characterised in that also include：
First request module, for initiating to obtain the request of PGW information to MME；
First PGW extraction modules, for receiving the PGW information for pre-saving that the MME is obtained from HSS；
First VoLTE data obtaining modules, the carrying information for obtaining the VoLTE networks from the PGW information.
10. the system that VoLTE according to claim 9 and VoWiFi switches, it is characterised in that also include:
Second request module, for initiating to obtain the request of PGW information to ePDG；
2nd PGW extraction modules, for receiving the PGW information for pre-saving that the ePDG is obtained from HSS；
First VoWiFi data obtaining modules, the carrying information for obtaining the VoWiFi networks from the PGW information.
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