CN102647694B - Speech business call continuity method and system - Google Patents
Speech business call continuity method and system Download PDFInfo
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- CN102647694B CN102647694B CN201110042270.5A CN201110042270A CN102647694B CN 102647694 B CN102647694 B CN 102647694B CN 201110042270 A CN201110042270 A CN 201110042270A CN 102647694 B CN102647694 B CN 102647694B
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Abstract
The present invention relates to a kind of speech business call continuity method and system, this method includes：Core net determines and sends its common single continuous voice call (SRVCC) ability information with the UE of speech business to current wireless access network, and the common SRVCC ability informations show the SRVCC ability informations to different radio access network；The UE is initiated after speech business, and when the current wireless access network judges that the SRVCC ability informations that the core net is issued show that isosystem measurement reports that the SRVCC abilities of corresponding Target cell are enabled, judgement is triggered to the SRVCC of the Target cell.The inventive method and system can cause current wireless access network correctly to trigger SRVCC flows, it is to avoid handoff failure.
Description
Technical field
The present invention relates to GSM, more particularly, to a kind of speech business call continuity implementation method and
System.
Background technology
SRVCC (Single Radio Voice Call Continuity, single continuous voice call) function is to protect
Speech business user is demonstrate,proved from LTE (Long Term Evolution, Long Term Evolution) Network Mobilities to UTRAN (UMTS
Terrestrial Radio Access Network-UMTS land radio access webs)/GERAN (GSM EDGE Radio
Access Network., GSM EDGE Radio Access Network) or CDMA2000 1xRTT (one kind be based on radio transmission techniques
(RTT) CDMA2000 types) system when, the continuity problem of speech business.
At the initial stage arranged net in LTE network, the whole network coverage is not up to, and mainly hot spot region is covered, when
When the LTE network of deployment provides VoIP (voice) business, the user that VoIP business is initiated in the lte networks leaves LTE covering models
When enclosing, the problem of just facing speech business call drop, in order to solve this problem, 3GPP/3GPP2 standards propose LTE and arrived
The SRVCC schemes of UTRAN/GERAN and CDMA20001x networks, can be before the user of speech business leaves LTE network, by voice
Service switching is into adjacent UTRAN/GERAN or CDMA2000 1x networks, so as to ensure not interrupting for voice call.
Because SRVCC schemes are realized based on IMS (IP Multimedia Subsystem, IP multimedia system), because
This is that must dispose IMS to network requirement, i.e., to carry out SRVCC source and destination system core net all needs to connect IMS.SRVCC
Decision-making need to consider UE abilities and core net ability simultaneously, and if only if carries out the UE and core-network side of speech business and all supports
During SRVCC, SRVCC processes are just can trigger.
SRVCC decision-making is completed in eNB (evolved Node B, evolved base station) side, is sent to eNB's in MME
Initial UE Context Setup Request (initial context sets up request) message or Handover Request (are cut
Change request) " SRVCC Operation Possible (SRVCC operates possibility) " cell can be carried in message, the cell is
MME and UE consults the knot after SRVCC abilities by NAS (NetworkAttached Storage, network attached storage) process
Really, represent that current UE and core-network side support SRVCC when being " TRUE ", if there is a side not support not take in SRVCC, message
With the cell, when eNB receives the instruction of " TRUE ", represent that eNB can trigger SRVCC processes to the UE, speech business is switched
Gone to objective network.
Current 3GPP/3GPP2 standards define two kinds of SRVCC processes, are respectively：
SRVCC process of the E-UTRAN networks to UTRAN/GERAN networks；
SRVCC process of the E-UTRAN networks to CDMA2000 1x networks.
It is fixed in UE two kinds of SRVCC abilities, 24.301 agreements to be respectively defined for the different SRVCC schemes of both the above
Adopted UE is carrying out NAS processes transmission " Attach Request (attach request) " or " Tracking Area Update
When Request (tracking area update request) " message is to MME, " UE Network Capability (UE nets can be carried in message
Network ability) " cell and " MS NetworkCapability (MS network capabilities) " cell, wherein " UE Network
1 bit in Capability " represents whether UE supports the SRVCC of E-UTRAN to CDMA2000 1x networks；
" 1 bit in MSNetwork Capability " represents whether UE supports E-UTRAN to UTRAN/GERAN networks
SRVCC。
When MME receives UE NAS message, UE SRVCC abilities and the SRVCC abilities of core net can be integrated, when and only
When both meeting, MME is being sent to eNB UE ContextSetup Request message or Handover Request
Will " SRVCCOperation Possible " cells be filled out as " Possible ", and other situations are not carried in (handover request) message
The cell, as shown in Figure 1.
Here it there is problem：Because UE is corresponded to respectively for two kinds of different SRVCC processes of different target system
Two kinds of UE abilities, and MME be issued to eNB " SRVCC Operation Possible " indication field only one of which, thus
In the case that UE only supports a kind of SRVCC, the field can not show that UE is really the SRVCC mistakes supported to which kind of goal systems
Journey, mistake can be all triggered when MME fills in cell and eNB carries out SRVCC decision-makings.
Such as UE only supports the SRVCC of UTRAN/GERAN networks, and the SRVCC of CDMA20001xRTT networks is not supported,
Then UE, which is sent in MME NAS signaling Attach Request or Tracking Area Update Request, can represent it
SRVCC to UTRAN/GERAN networks are supported, without supporting SRVCC to CDMA2000 1xRTT networks, if current E-UTRAN covers
There is UTRAN/GERAN and CDMA2000 1xRTT networks simultaneously around cover area, and UTRAN/GERAN core net is connected to
IMS, then the SRVCC process UE abilities and core net ability to UTRAN/GERAN are satisfied by, and arrive CDMA2000 1xRTT's
SRVCC is unsatisfactory for due to UE abilities, then does not possess the SRVCC abilities to CDMA2000 1xRTT networks.
Problem 1：MME is sent to eNB UE Context Setup Request message or HandoverRequest message
It is middle to incite somebody to action " how SRVCC Operation Possible " fields fill inIf extending this as " Possible ", it is likely that cause
ENB is in decision-making UE to CDMA2000 1xRTT different system switching, false triggering SRVCC processes；If not carrying the cell, cause
ENB can not be triggered to UTRAN/GERAN SRVCC processes.
Problem 2：Assuming that in problem 1 MME will " SRVCC Operation Possible " fields are set to " Possible ", if
Now UE initiates speech business in E-UTRAN networks, and because reaches E-UTRAN network edges, adjacent CDMA2000 1x
Adjacent area quality meets isosystem measurement criterion, reporting measurement reports to eNB, and eNB passes through " the SRVCC Operation that have preserved
Possible " fields take for UE and target CDMA2000 1xRTT networks all support SRVCC, therefore triggering SRVCC flows are arrived
Target CDMA2000 1x adjacent areas, cause handoff failure, and speech business is interrupted, and influences the impression of user.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of speech business call continuity method and system, to keep away
Exempt to be triggered to the problem of SRVCC flows of false target system cause handoff failure.
To solve above technical problem, the invention provides a kind of speech business call continuity implementation method, this method
Including：
Core net determines and sends its common single audio call with the UE of speech business to current wireless access network
Continuity (SRVCC) ability information, the common SRVCC ability informations show the SRVCC abilities to different radio access network
Information；
The UE is initiated after speech business, and the current wireless access network judges the SRVCC abilities that the core net is issued
When information shows that isosystem measurement reports that the SRVCC abilities of corresponding Target cell are enabled, judgement is triggered to the Target cell
SRVCC.
Further, the wireless access network includes E-UTRAN, UTRAN, GERAN or CDMA2000 1xRTT.
Further, the SRVCC ability informations that the SRVCC ability informations and the core net that the UE is reported are issued are used
Display or implicit mode represent the SRVCC abilities of different radio access network.
Further, the SRVCC ability informations that the core net is issued are shown at least two using at least two fields
The SRVCC abilities of wireless access network.
Further, the core net issues initial context and sets up request (Initial UE Context
SetupRequest) message or the common SRVCC abilities letter is carried during handover request (Handover Request) message
Breath.
Further, the core net is entered as using SRVCC to UTRAN/GERAN Operation Possible
UTRAN/GERAN SRVCC abilities are represented during Possible, using SRVCC toCDMA2000 1x Operation
Possible is entered as representing CDMA2000 1x SRVCC during Possible.
To solve above technical problem, system is realized present invention also offers a kind of speech business call continuity, this is
System includes：
The ability information of the core net issues module, for determining and sending the core net to current wireless access network
With the UE of speech business common single continuous voice call (SRVCC) ability information, the common SRVCC abilities letter
Breath shows the SRVCC ability informations to different radio access network；
The SRVCC triggering judging modules of the wireless access network, the UE is initiated after speech business, for deciding whether to touch
SRVCC is sent out, wherein the SRVCC ability informations that the core net is issued show that isosystem measurement reports corresponding Target cell
When SRVCC abilities are enabled, judgement is triggered to the SRVCC of the Target cell.
Further, the SRVCC ability informations that the SRVCC ability informations and the core net that the UE is reported are issued are used
Display or implicit mode show the SRVCC abilities to different radio access network.
Further, the core net issues initial context and sets up request (Initial UE Context
SetupRequest) message or the common SRVCC abilities letter is carried during handover request (Handover Request) message
Breath.
Further, the core net is entered as using SRVCC to UTRAN/GERAN Operation Possible
UTRAN/GERAN SRVCC abilities are represented during Possible, using SRVCC toCDMA2000 1x Operation
Possible is entered as representing CDMA2000 1x SRVCC during Possible.
Core net issues it to current wireless access network in speech business call continuity method and system of the present invention
The common SRVCC ability informations with user equipment (UE), the common SRVCC ability informations show to different radio access network
SRVCC ability informations, so that current wireless access network can correctly trigger SRVCC according to the common SRVCC ability informations
Flow, it is to avoid handoff failure.
Brief description of the drawings
Fig. 1 indicates situation schematic diagram for SRVCC abilities in the prior art；
Fig. 2 is the schematic diagram of speech business call continuity implementation method of the present invention；
Fig. 3 is the specific signal of speech business call continuity implementation method of the present invention；
Fig. 4 is the schematic diagram of the embodiment of the present invention 1, and UE abilities only support UTRAN/GERAN's in the embodiment
SRVCC, switching target small area is UTRAN/GERAN cells；
Fig. 5 is the schematic diagram of the embodiment of the present invention 2, and UE abilities only support UTRAN/GERAN's in the embodiment
SRVCC, switching target small area is CDMA2000 1xRTT cells；
Fig. 6 is the schematic diagram of the embodiment of the present invention 3, and UE abilities support two kinds of SRVCC processes, but core net in the embodiment
Only support to arrive UTRAN/GERAN SRVCC, switching target small area is UTRAN/GERAN cells；
Fig. 7 is the schematic diagram of the embodiment of the present invention 4, and UE abilities support two kinds of SRVCC processes, but core net in the embodiment
Only support to arrive UTRAN/GERAN SRVCC, switching target small area is CDMA2000 1xRTT cells.
Embodiment
The main thought of speech business call continuity method and system of the present invention is, core net is to currently wirelessly connecing
Networking issues its SRVCC ability information common with user equipment (UE), and the common SRVCC ability informations show to different nothings
The SRVCC ability informations of line access, so that current wireless access network can be correct according to the common SRVCC ability informations
Trigger SRVCC flows, it is to avoid handoff failure.
As shown in Fig. 2 speech business call continuity implementation method of the present invention includes：
Step 201：Core net is determined and to send it to current wireless access network common single with the UE of speech business
Continuous voice call (SRVCC) ability information, the common SRVCC ability informations show to different radio access network
SRVCC ability informations；
Step 202：The UE is initiated after speech business, and the current wireless access network judges what the core net was issued
When SRVCC ability informations show that isosystem measurement reports that the SRVCC abilities of corresponding Target cell are enabled, judgement is triggered to described
The SRVCC of Target cell, is not otherwise triggered.
Wireless access network described in the present invention includes E-UTRAN, UTRAN/GERAN or CDMA2000 1xRTT.
The SRVCC ability informations that the SRVCC ability informations and the core net that the UE is reported are issued are using display or hidden
The mode of formula represents the SRVCC abilities of different radio access network.Implicitly refer to system default with or without wireless to certain
GL information is not sent during the SRVCC abilities of access network.
Preferably, the core net is by the way of display, and the SRVCC ability informations issued use at least two field lists
The bright SRVCC abilities at least two wireless access networks, by the different assignment of each field (such as TRUE and FALSE, or
Possible and Impossible) represent to support respectively or do not support the SRVCC abilities of specific wireless access network.
Below with the SRVCC processes and E-UTRAN networks of E-UTRAN networks to UTRAN/GERAN networks to CDMA2000
Illustrated exemplified by the SRVCC processes of 1x networks：
As shown in Figure 3, it is preferable that by S1 mouthfuls of Initial UE Context Setup Request message,
In Handover Request message " SRVCC Operation Possible " fields, modification be refined as two fields
" SRVCC to UTRAN/GERAN Operation Possible (SRVCC to UTRAN/GERAN operation possibility) " and
" SRVCC to CDMA2000 1x OperationPossible (SRVCC to CDMA2000 1x operation possibility) ", respectively
Indicate whether the SRVCC supported to UTRAN/GERAN, and whether support CDMA2000 1xRTT SRVCC, when MME is received
After UE two kinds of SRVCC abilities, the core net ability of correspondence goal systems can be combined, to field " SRVCC to UTRAN/
GERAN Operation Possible " and " SRVCC toCDMA2000 1x Operation Possible " difference assignment.
So, when the UE of speech business has reported isosystem measurement to report at E-UTRAN coverings edge, eNB can root
According to the Target cell said system reported, judge that its corresponding enables indicates, if " the SRVCC Operation of correspondence system
Possible " is indicated, if " Possible ", then be can trigger the SRVCC processes of the system, otherwise, is not triggered SRVCC.
In order that technical scheme and advantage are clearer, the various implementations to the present invention below in conjunction with the accompanying drawings are walked
Suddenly it is described in further detail.
Embodiment 1
In the embodiment, UE abilities only support that the SRVCC core net abilities to UTRAN/GERAN support UTRAN/
GERAN and the SRVCC abilities to CDMA2000 1xRTT, switching target small area show for the processing mode of UTRAN/GERAN cells
Intention is shown in Fig. 4.
UE passes through the " UE in NAS signaling Attach Request or Tracking Area Update Request message
Network Capability " fields and " MS Network Capability " fields indicate MME, its ability support arrive
UTRAN/GERAN SRVCC processes, without supporting the SRVCC processes to CDMA20001xRTT；
MME judges that core net ability supports UTRAN/GERAN and the SRVCC abilities to CDMA2000 1xRTT, comprehensive
After the SRVCC abilities for closing UE, in Initial UE the ContextSetup Request or Handover issued to eNB
Only by " SRVCC to UTRAN/GERANOperation Possible " fields are set to " possible " in Request message；
UE initiates speech business in E-UTRAN, due to reaching E-UTRAN network coverages edges, thus triggering report it is different
Systematic survey reports that Target cell is UTRAN/GERAN cells in measurement report, and MME issues " SRVCC before eNB sides judge
To UTRAN/GERAN OperationPossible " fields are " possible ", then trigger UE to UTRAN/GERAN's
SRVCC processes, UTRAN/GERAN networks are switched to by speech business.
Embodiment 2
In the embodiment, UE abilities only support UTRAN/GERAN SRVCC, and core net ability supports UTRAN/
GERAN and the SRVCC abilities to CDMA2000 1xRTT, switching target small area are the processing mode of CDMA2000 1xRTT cells
Schematic diagram is shown in Fig. 5.
UE passes through the " UE in NAS signaling Attach Request or Tracking Area Update Request message
Network Capability " fields and " MS Network Capability " fields indicate MME, its ability support arrive
UTRAN/GERAN SRVCC processes, without supporting the SRVCC processes to CDMA20001xRTT；
MME judges that core net ability supports UTRAN/GERAN and the SRVCC abilities to CDMA2000 1xRTT, comprehensive
After the SRVCC abilities for closing UE, in Initial UE the ContextSetup Request or Handover issued to eNB
Only by " SRVCC to UTRAN/GERANOperation Possible " fields are set to " possible " in Request message；
UE initiates speech business in E-UTRAN, due to reaching E-UTRAN network coverages edges, thus triggering report it is different
Systematic survey reports that Target cell is CDMA2000 1xRTT cells in measurement report, and MME is issued before eNB sides judge
" SRVCC to CDMA2000 1x Operation Possible " fields are not " possible ", therefore do not trigger UE and arrive
CDMA2000 1xRTT SRVCC processes.
Embodiment 3：
In the embodiment, UE abilities support two kinds of SRVCC processes, but core net only supports UTRAN/GERAN SRVCC,
Fig. 6 is seen in switching target small area for the processing mode schematic diagram of UTRAN/GERAN cells.
UE passes through the " UE in NAS signaling Attach Request or Tracking Area Update Request message
Network Capability " fields and " MS Network Capability " fields indicate MME, its ability simultaneously support arrive
UTRAN/GERAN SRVCC processes and the SRVCC processes to CDMA2000 1xRTT；
MME judges that core net ability only supports UTRAN/GERAN SRVCC, without supporting to arrive CDMA2000 1xRTT
SRVCC abilities, after comprehensive UE SRVCC abilities, in the Initial UE Context Setup Request issued to eNB
Or only by " SRVCC to UTRAN/GERAN Operation Possible " fields are set in Handover Request message
“possible”。
UE initiates speech business in E-UTRAN, due to reaching E-UTRAN network coverages edges, thus triggering report it is different
Systematic survey reports that Target cell is UTRAN/GERAN cells in measurement report, and MME issues " SRVCC before eNB sides judge
To UTRAN/GERAN OperationPossible " fields are " possible ", then trigger UE to UTRAN/GERAN's
SRVCC processes, UTRAN/GERAN networks are switched to by speech business.
Embodiment 4：
In the embodiment, UE abilities support two kinds of SRVCC processes, but core net only supports UTRAN/GERAN SRVCC,
Fig. 7 is seen in switching target small area for the processing mode schematic diagram of CDMA2000 1xRTT cells.
UE passes through the " UE in NAS signaling Attach Request or Tracking Area Update Request message
Network Capability " fields and " MS Network Capability " fields indicate MME, its ability simultaneously support arrive
UTRAN/GERAN SRVCC processes and the SRVCC processes to CDMA2000 1xRTT；
MME judges that core net ability only supports UTRAN/GERAN SRVCC, without supporting to arrive CDMA2000 1xRTT
SRVCC abilities, after comprehensive UE SRVCC abilities, in the Initial UE Context Setup Request issued to eNB
Or only by " SRVCC to UTRAN/GERAN Operation Possible " fields are set in Handover Request message
“possible”。
UE initiates speech business in E-UTRAN, due to reaching E-UTRAN network coverages edges, thus triggering report it is different
Systematic survey reports that Target cell is CDMA2000 1xRTT cells in measurement report, and MME is issued before eNB sides judge
" SRVCC to CDMA2000 1x Operation Possible " fields are not " possible ", therefore do not trigger UE and arrive
CDMA2000 1xRTT SRVCC processes.
It is used to show that the field to the SRVCC abilities of different radio access network is only signal above, when implementing, to word
The title of section and the specific assignment of field are not limited, as long as core net and current wireless access network can be recognized correctly i.e.
Can.
Above example is switching to E-UTRAN to UTRAN/GERAN and E-UTRAN to CDMA2000 1xRTT
What example was illustrated, it will be appreciated that, as long as being related to the switching between different radio access network, all applicable the inventive method.
Corresponding to above method, system is realized present invention also offers a kind of speech business call continuity, the system bag
Include：
The ability information of the core net issues module, for determining and sending the core net to current wireless access network
With the UE of speech business common SRVCC ability informations, the common SRVCC ability informations show to different radio to access
The SRVCC ability informations of net；
The SRVCC triggering judging modules of the wireless access network, when the UE initiates switching, for deciding whether triggering
SRVCC, wherein the SRVCC ability informations that the core net is issued show that isosystem measurement reports corresponding Target cell
When SRVCC abilities are enabled, judgement is triggered to the SRVCC of the Target cell, does not otherwise trigger.
Understandably, corresponding to previous embodiment, the ability information of core net, which issues module, to be realized in MME network element, when
So when MME network element function setting is changed, the ability information issues module and can also realized in other respective network elements.Wireless access
The SRVCC triggering judging modules of net realize can there is the corresponding of different base station systems corresponding to different wireless access networks in eNB
Equipment realizes that the present invention is not limited this.
Further, the wireless access network includes E-UTRAN, UTRAN, GERAN or CDMA2000 1xRTT.
Further, the SRVCC ability informations that the SRVCC ability informations and the core net that the UE is reported are issued are used
Display or implicit mode show the SRVCC abilities to different radio access network.
Further, the SRVCC ability informations that the core net is issued are shown at least two using at least two fields
The SRVCC abilities of wireless access network.
Preferably, the core net issues initial context and sets up request (Initial UE Context
SetupRequest) message or the common SRVCC abilities letter is carried during handover request (Handover Request) message
Breath.Further, the core net is entered as using SRVCC to UTRAN/GERAN OperationPossible
UTRAN/GERAN SRVCC abilities are represented during Possible, using SRVCC to CDMA2000 1x Operation
Possible is entered as representing CDMA2000 1x SRVCC during Possible.
One of ordinary skill in the art will appreciate that all or part of step in the above method can be instructed by program
Related hardware is completed, and described program can be stored in computer-readable recording medium, such as read-only storage, disk or CD
Deng.Alternatively, all or part of step of above-described embodiment can also use one or more integrated circuits to realize.Accordingly
Each module in ground, above-described embodiment can be realized in the form of hardware, it would however also be possible to employ the form of software function module is real
It is existing.The present invention is not restricted to the combination of the hardware and software of any particular form.
Claims (12)
1. a kind of speech business call continuity implementation method, it is characterised in that this method includes：
Core net determines and sends its common single voice with the user equipment (UE) of speech business to current wireless access network
Call continuity SRVCC ability informations, the common SRVCC ability informations show the SRVCC energy to different radio access network
Force information；
The UE is initiated after speech business, and the current wireless access network judges the SRVCC ability informations that the core net is issued
When showing that isosystem measurement reports that the SRVCC abilities of corresponding Target cell are enabled, judgement is triggered to the Target cell
SRVCC。
2. the method as described in claim 1, it is characterised in that：The wireless access network includes E-UTRAN, UTRAN, GERAN
Or CDMA2000 1xRTT.
3. the method as described in claim 1, it is characterised in that：SRVCC ability informations and the core net that the UE is reported
The SRVCC ability informations issued using display or it is implicit by the way of represent the SRVCC abilities of different radio access network.
4. the method as described in claim 1, it is characterised in that：The SRVCC ability informations that the core net is issued are using at least
Two fields show the SRVCC abilities at least two wireless access networks.
5. the method as described in claim 1, it is characterised in that：The core net issues initial context and sets up request
Carry described common when Initial UE Context Setup Request message or handover request HandoverRequest message
Same SRVCC ability informations.
6. the method as described in claim 1 or 5, it is characterised in that：The core net uses SRVCCto UTRAN/GERAN
Operation Possible are entered as representing UTRAN/GERAN SRVCC abilities during Possible, using SRVCC to
CDMA2000 1x Operation Possible are entered as representing CDMA2000 1x SRVCC during Possible.
7. a kind of speech business call continuity realizes system, it is characterised in that the system includes：
The ability information of core net issues module, for determining and sending the core net and voice industry to current wireless access network
The common single continuous voice call SRVCC ability informations of the user equipment (UE) of business, the common SRVCC ability informations
Show the SRVCC ability informations to different radio access network；
The SRVCC triggering judging modules of the wireless access network, the UE is initiated after speech business, for deciding whether triggering
SRVCC, wherein the SRVCC ability informations that the core net is issued show that isosystem measurement reports corresponding Target cell
When SRVCC abilities are enabled, judgement is triggered to the SRVCC of the Target cell.
8. system as claimed in claim 7, it is characterised in that：The wireless access network includes E-UTRAN, UTRAN/GERAN
Or CDMA2000 1xRTT.
9. system as claimed in claim 7, it is characterised in that：SRVCC ability informations and the core net that the UE is reported
The SRVCC ability informations issued using display or it is implicit by the way of show SRVCC abilities to different radio access network.
10. system as claimed in claim 7, it is characterised in that：The SRVCC ability informations that the core net is issued are using at least
Two fields show the SRVCC abilities at least two wireless access networks.
11. system as claimed in claim 7, it is characterised in that：The core net issues initial context and sets up request
Carried when Initial UE Context Setup Request message or handover request Handover Request message described
Common SRVCC ability informations.
12. the system as described in claim 7 or 11, it is characterised in that：The core net uses SRVCC to UTRAN/
GERAN Operation Possible are entered as representing UTRAN/GERAN SRVCC abilities during Possible, use
SRVCC to CDMA2000 1x Operation Possible are entered as representing CDMA2000 1x's during Possible
SRVCC。
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| CN201110042270.5A CN102647694B (en) | 2011-02-18 | 2011-02-18 | Speech business call continuity method and system |
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| CN201110042270.5A CN102647694B (en) | 2011-02-18 | 2011-02-18 | Speech business call continuity method and system |
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| CN102647693B (en) * | 2011-02-18 | 2016-11-23 | 中兴通讯股份有限公司 | Speech business call continuity method and system |
| WO2019061445A1 (en) * | 2017-09-30 | 2019-04-04 | 深圳市云中飞网络科技有限公司 | Csfb fallback result detecting method and device and computer storage medium |
| CN108419230B (en) * | 2018-02-13 | 2021-03-16 | Oppo广东移动通信有限公司 | Communication method, base station and storage medium |
| CN110856229B (en) * | 2019-11-21 | 2021-12-07 | 中国联合网络通信集团有限公司 | Network switching method, device and communication system |
| CN111246530B (en) * | 2020-02-06 | 2022-10-18 | 北京小米移动软件有限公司 | Network switching method and device and storage medium |
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| US20110280217A1 (en) * | 2008-11-10 | 2011-11-17 | Nicolas Drevon | Support of cs domain services over a packet only mobile system |
| CN101959269B (en) * | 2009-07-15 | 2013-04-24 | 华为技术有限公司 | Switching method and device |
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