CN102647694A - Method and system for realizing radio voice call continuity (RVCC) - Google Patents
Method and system for realizing radio voice call continuity (RVCC) Download PDFInfo
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- CN102647694A CN102647694A CN2011100422705A CN201110042270A CN102647694A CN 102647694 A CN102647694 A CN 102647694A CN 2011100422705 A CN2011100422705 A CN 2011100422705A CN 201110042270 A CN201110042270 A CN 201110042270A CN 102647694 A CN102647694 A CN 102647694A
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Abstract
The invention relates to a method and a system for realizing radio voice call continuity (RVCC). The method comprises the following steps that a core network determines and sends single RVCC (SRVCC) ability information shared with user equipment (UE) initiating the radio voice to a current radio access network, wherein the shared SRVCC ability information shows the SRVCC ability information to different radio access networks; and after the UE initiates the radio voice, the current radio access network judges to trigger SRVCC to a target cell when judging that the SRVCC ability information sent by the core network shows the SRVCC ability of the target cell corresponding to the inter-system measurement report is enabled. By adopting the method and the system, the current radio access network can correctly trigger the SRVCC flow and avoid handover failure.
Description
Technical field
The present invention relates to GSM, more specifically, relate 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 guarantee that the speech business user is from LTE (Long Term Evolution; Long Term Evolution) network mobile is to UTRAN (UMTS Terrestrial Radio Access Network-UMTS land radio access web)/GERAN (GSM EDGE Radio Access Network.; GSM EDGE Radio Access Network) or during CDMA2000 1xRTT (a kind of CDMA2000 type) system based on radio transmission techniques (RTT), the continuity problem of speech business.
At the initial stage that the LTE network is arranged net, can not reach the whole network coverage, and mainly the hot spot region covered; When the LTE network of disposing provides VoIP (voice) professional; When the professional user of initiation VoIP leaves the LTE coverage in the LTE network, with regard to facing the problem of speech business call drop, in order to address this problem; The 3GPP/3GPP2 standard has proposed the SRVCC scheme of LTE to UTRAN/GERAN and CDMA20001x network; Before can leaving the LTE network the user of speech business, speech business is switched in adjacent UTRAN/GERAN or the CDMA2000 1x network, thereby guarantee not interrupting of voice call.
Because the SRVCC scheme is based on IMS (IP Multimedia Subsystem, IP multimedia system) realization, be to dispose IMS therefore to network requirement, the source and destination system core net that promptly will carry out SRVCC all need connect IMS.The decision-making of SRVCC need be considered UE ability and core net ability simultaneously, when UE and the core-network side that and if only if carries out speech business all supported SRVCC, just can trigger the SRVCC process.
The decision-making of SRVCC is at eNB (evolved Node B; Evolved base station) side is accomplished; In MME sends to Initial UE Context Setup Request (initial context set up request) message or Handover Request (handoff request) message of eNB, can carry " SRVCC Operation Possible (SRVCC operate possibility) " cell, this cell is MME and UE passes through the result after NAS (NetworkAttached Storage, network attached storage) the process negotiation SRVCC ability; Represent during for " TRUE " that current UE and core-network side all support SRVCC; If there is a side not support SRVCC, then do not carry this cell in the message, when eNB receives the indication of " TRUE "; Expression eNB can trigger the SRVCC process to this UE, and speech business is switched to objective network.
Current 3GPP/3GPP2 standard definition two kinds of SRVCC processes, be respectively:
The E-UTRAN network is to the SRVCC process of UTRAN/GERAN network;
The E-UTRAN network is to the SRVCC process of CDMA2000 1x network.
Two kinds of SRVCC abilities of UE have been defined respectively for above two kinds of different SRVCC schemes; 24.301 definition UE is when carrying out NAS process transmission " Attach Request (attach request) " or " Tracking Area Update Request (tracking area update request) " message to MME in the agreement; Portability in the message " UE Network Capability (UE network capabilities) " cell and " MS NetworkCapability (MS network capabilities) " cell, wherein 1 bit in " UE Network Capability " representes whether UE supports the SRVCC of E-UTRAN to CDMA2000 1x network; 1 bit in " MSNetwork Capability " representes whether UE supports the SRVCC of E-UTRAN to the UTRAN/GERAN network.
When MME receives the NAS message of UE; The SRVCC ability of the comprehensive UE of meeting and the SRVCC ability of core net; And if only if when the both satisfies; MME fills out " SRVCCOperation Possible " cell in UE ContextSetup Request message that sends to eNB or Handover Request (handoff request) message and is " Possible ", and other situation is not carried this cell, and is as shown in Figure 1.
Here existing problems just: since UE to two kinds of the different target system different SRVCC processes corresponding respectively two kinds of UE abilities; And being issued to eNB's " SRVCC Operation Possible " indication field, MME has only one; Therefore only support under the situation of a kind of SRVCC at UE; This field can't show UE actual be the SRVCC process of supporting which kind of goal systems, fill at MME and all can cause mistake when cell and eNB carry out the SRVCC decision-making.
Only support the SRVCC of UTRAN/GERAN network like UE; Do not support the SRVCC of CDMA20001xRTT network; Then UE send among NAS signaling Attach Request or the Tracking Area Update Request of MME can expression its support SRVCC to the UTRAN/GERAN network; And do not support SRVCC to CDMA2000 1xRTT network; If have UTRAN/GERAN and CDMA2000 1xRTT network simultaneously around the current E-UTRAN overlay area, and the core net of UTRAN/GERAN connected IMS, and the SRVCC process UE ability and the core net ability that then arrive UTRAN/GERAN are all satisfied; And do not satisfy owing to the UE ability to the SRVCC of CDMA2000 1xRTT, then do not possess to the SRVCC ability of CDMA2000 1xRTT network.
Is does problem 1:MME send in UE Context Setup Request message or the HandoverRequest message of eNB, and how " SRVCC Operation Possible " field filled in? If extend this as " Possible "; Then might cause eNB at decision-making UE during, false triggering SRVCC process to the different system switching of CDMA2000 1xRTT; If do not carry this cell, then cause eNB can't be triggered to the SRVCC process of UTRAN/GERAN.
Problem 2: suppose that MME is changed to " Possible " with " SRVCC Operation Possible " field in the problem 1; If this moment, UE initiated speech business in the E-UTRAN network, and because arrive the E-UTRAN network edge, adjacent CDMA2000 1x adjacent area quality satisfies the isosystem measurement criterion; Reporting measurement reports is to eNB; ENB takes for UE through " the SRVCC Operation Possible " field of having preserved and target CDMA2000 1xRTT network is all supported SRVCC, therefore triggers the SRVCC flow process to target CDMA2000 1x adjacent area, causes handoff failure; Speech business is interrupted, and influences user's impression.
Summary of the invention
The technical problem that the present invention will solve provides a kind of speech business call continuity implementation method and system, causes the problem of handoff failure with the SRVCC flow process of avoiding being triggered to the false target system.
For solving above technical problem, the invention provides a kind of speech business call continuity implementation method, this method comprises:
Common single continuous voice call (SRVCC) ability information that core net is confirmed and sent the UE of itself and speech business to the current wireless Access Network, said common SRVCC ability information shows the SRVCC ability information of different radio Access Network;
After said UE initiated speech business, said current wireless Access Network judged that the SRVCC ability information that said core net issues shows that judgement was triggered to the SRVCC of said Target cell when the SRVCC ability of the Target cell that the isosystem measurement report is corresponding enabled.
Further, said wireless access network comprises E-UTRAN, UTRAN, GERAN or CDMA2000 1xRTT.
Further, the SRVCC ability information that issues of the SRVCC ability information that reports of said UE and said core net adopts and shows or the mode of implicit expression is represented the SRVCC ability of different radio Access Network.
Further, the SRVCC ability information that issues of said core net adopts at least two fields to show the SRVCC ability of at least two wireless access networks.
Further, said core net issues and carries said common SRVCC ability information when initial context is set up request (Initial UE Context SetupRequest) message or handoff request (Handover Request) message.
Further; The SRVCC ability of representing UTRAN/GERAN when said core net adopts SRVCC to UTRAN/GERAN Operation Possible assignment for Possible is represented the SRVCC of CDMA2000 1x when adopting SRVCC toCDMA2000 1x Operation Possible assignment for Possible.
For solving above technical problem, the present invention also provides a kind of speech business call continuity to realize system, and this system comprises:
The ability information of said core net issues module; Be used for confirming and send to the current wireless Access Network common single continuous voice call (SRVCC) ability information of the UE of said core net and speech business, said common SRVCC ability information shows the SRVCC ability information of different radio Access Network;
The SRVCC of said wireless access network triggers judging module; After said UE initiates speech business; Be used for judgement and whether trigger SRVCC; The SRVCC ability information that wherein said core net issues shows that judgement was triggered to the SRVCC of said Target cell when the SRVCC ability of the Target cell that the isosystem measurement report is corresponding enabled.
Further, the SRVCC ability information that issues of the SRVCC ability information that reports of said UE and said core net adopts and shows or the mode of implicit expression shows the SRVCC ability of different radio Access Network.
Further, said core net issues and carries said common SRVCC ability information when initial context is set up request (Initial UE Context SetupRequest) message or handoff request (Handover Request) message.
Further; The SRVCC ability of representing UTRAN/GERAN when said core net adopts SRVCC to UTRAN/GERAN Operation Possible assignment for Possible is represented the SRVCC of CDMA2000 1x when adopting SRVCC toCDMA2000 1x Operation Possible assignment for Possible.
Core net issues itself and the common SRVCC ability information of subscriber equipment (UE) to the current wireless Access Network in speech business call continuity implementation method of the present invention and the system; This common SRVCC ability information shows the SRVCC ability information of different radio Access Network; Thereby make the current wireless Access Network correctly to trigger the SRVCC flow process, avoid handoff failure according to this common SRVCC ability information.
Description of drawings
Fig. 1 is a SRVCC ability indication situation sketch map in the prior art;
Fig. 2 is the sketch map of speech business call continuity implementation method of the present invention;
Fig. 3 is the concrete signal of speech business call continuity implementation method of the present invention;
Fig. 4 is the sketch map of the embodiment of the invention 1, and the UE ability is only supported the SRVCC of UTRAN/GERAN among this embodiment, and switching target small area is the UTRAN/GERAN sub-district;
Fig. 5 is the sketch map of the embodiment of the invention 2, and the UE ability is only supported the SRVCC of UTRAN/GERAN among this embodiment, and switching target small area is CDMA2000 1xRTT sub-district;
Fig. 6 is the sketch map of the embodiment of the invention 3, and the UE ability is supported two kinds of SRVCC processes among this embodiment, but core net is only supported UTRAN/GERAN SRVCC, and switching target small area is the UTRAN/GERAN sub-district;
Fig. 7 is the sketch map of the embodiment of the invention 4, and the UE ability is supported two kinds of SRVCC processes among this embodiment, but core net is only supported UTRAN/GERAN SRVCC, and switching target small area is CDMA2000 1xRTT sub-district.
Embodiment
The main thought of speech business call continuity implementation method of the present invention and system is; Core net issues itself and the common SRVCC ability information of subscriber equipment (UE) to the current wireless Access Network; This common SRVCC ability information shows the SRVCC ability information of different radio Access Network; Thereby make the current wireless Access Network correctly to trigger the SRVCC flow process, avoid handoff failure according to this common SRVCC ability information.
As shown in Figure 2, speech business call continuity implementation method of the present invention comprises:
Step 201: common single continuous voice call (SRVCC) ability information that core net is confirmed and sent the UE of itself and speech business to the current wireless Access Network, said common SRVCC ability information shows the SRVCC ability information of different radio Access Network;
Step 202: after said UE initiates speech business; Said current wireless Access Network judges that the SRVCC ability information that said core net issues shows when the SRVCC ability of the Target cell that the isosystem measurement report is corresponding enables; Judgement is triggered to the SRVCC of said Target cell, otherwise does not trigger.
The said wireless access network of the present invention comprises E-UTRAN, UTRAN/GERAN or CDMA2000 1xRTT.
The SRVCC ability information that SRVCC ability information that said UE reports and said core net issue adopts the mode of demonstration or implicit expression to represent the SRVCC ability of different radio Access Network.When referring to that system default possesses or do not possess the SRVCC ability to certain wireless access network, implicit expression do not send the correlation energy force information.
Preferably; Said core net adopts the mode that shows; The SRVCC ability information that issues adopts at least two fields to show the SRVCC ability of at least two wireless access networks; Different assignment through each field (like TRUE and FALSE, or Possible and Impossible) come to express support for respectively or do not support the SRVCC ability of specific wireless Access Network.
Below be that example describes with the SRVCC process of E-UTRAN network to the SRVCC process of UTRAN/GERAN network and E-UTRAN network to CDMA2000 1x network:
As shown in Figure 3; Preferably; With the Initial UE Context Setup Request message of S1 mouth, " the SRVCC Operation Possible " field in the Handover Request message; Modification is refined as two fields " SRVCC to UTRAN/GERAN Operation Possible (SRVCC is to the operation possibility of UTRAN/GERAN) " and " SRVCC to CDMA2000 1x OperationPossible (SRVCC is to the operation possibility of CDMA2000 1x) "; Indicate whether to support the SRVCC of UTRAN/GERAN respectively; Whether support the SRVCC of CDMA2000 1xRTT; Receive two kinds of SRVCC abilities of UE as MME after, can combine the core net ability of corresponding goal systems, to field " SRVCC to UTRAN/GERAN Operation Possible " and " SRVCC toCDMA2000 1x Operation Possible " difference assignment.
Like this, when the UE of speech business had reported the isosystem measurement report at E-UTRAN covering edge, eNB can be according to system under the Target cell that reports; Judge the indication that enables of its correspondence; " the SRVCC Operation Possible " if of corresponding system indication, if " Possible " then can be triggered to the SRVCC process of this system; Otherwise, do not trigger SRVCC.
In order to make technical scheme of the present invention and advantage clearer, various implementation steps of the present invention are done further to describe in detail below in conjunction with accompanying drawing.
Embodiment 1
Among this embodiment, the UE ability only supports the SRVCC core net ability of UTRAN/GERAN all to support UTRAN/GERAN and to the SRVCC ability of CDMA2000 1xRTT, switching target small area is that the processing mode sketch map of UTRAN/GERAN sub-district is seen Fig. 4.
UE is through " the UE Network Capability " field in NAS signaling Attach Request or the Tracking Area Update Request message and " MS Network Capability " field indication MME; Its ability is supported the SRVCC process of UTRAN/GERAN, and does not support the SRVCC process of CDMA20001xRTT;
MME judgement core net ability is all supported UTRAN/GERAN and is arrived the SRVCC ability of CDMA2000 1xRTT; After the SRVCC ability of comprehensive UE, in Initial UE ContextSetup Request that issues to eNB or Handover Request message, only " SRVCC to UTRAN/GERANOperation Possible " field is changed to " possible ";
UE initiates speech business in E-UTRAN; Owing to arrive E-UTRAN network coverage edge; Therefore trigger reporting the isosystem measurement report, Target cell is the UTRAN/GERAN sub-district in the measurement report, and MME issued " SRVCC to UTRAN/GERAN OperationPossible " field and is " possible " before the eNB side was judged; Then trigger the SRVCC process of UE, speech business is switched to the UTRAN/GERAN network to UTRAN/GERAN.
Embodiment 2
Among this embodiment, the UE ability is only supported the SRVCC of UTRAN/GERAN, and the core net ability is all supported UTRAN/GERAN and arrive the SRVCC ability of CDMA2000 1xRTT that switching target small area is that the processing mode sketch map of CDMA2000 1xRTT sub-district is seen Fig. 5.
UE is through " the UE Network Capability " field in NAS signaling Attach Request or the Tracking Area Update Request message and " MS Network Capability " field indication MME; Its ability is supported the SRVCC process of UTRAN/GERAN, and does not support the SRVCC process of CDMA20001xRTT;
MME judgement core net ability is all supported UTRAN/GERAN and is arrived the SRVCC ability of CDMA2000 1xRTT; After the SRVCC ability of comprehensive UE, in Initial UE ContextSetup Request that issues to eNB or Handover Request message, only " SRVCC to UTRAN/GERANOperation Possible " field is changed to " possible ";
UE initiates speech business in E-UTRAN; Owing to arrive E-UTRAN network coverage edge; Therefore trigger and report the isosystem measurement report; Target cell is CDMA2000 1xRTT sub-district in the measurement report, and to issue " SRVCC to CDMA2000 1x Operation Possible " field be not " possible " to MME before the eNB side was judged, therefore do not trigger the SRVCC process of UE to CDMA2000 1xRTT.
Embodiment 3:
Among this embodiment, the UE ability is supported two kinds of SRVCC processes, but core net is only supported UTRAN/GERAN SRVCC, and switching target small area is that the processing mode sketch map of UTRAN/GERAN sub-district is seen Fig. 6.
UE is through " the UE Network Capability " field in NAS signaling Attach Request or the Tracking Area Update Request message and " MS Network Capability " field indication MME, and its ability is supported the SRVCC process of UTRAN/GERAN simultaneously and arrived the SRVCC process of CDMA2000 1xRTT;
MME judgement core net ability is only supported the SRVCC of UTRAN/GERAN; And do not support the SRVCC ability of CDMA2000 1xRTT; After the SRVCC ability of comprehensive UE, in Initial UE Context Setup Request that issues to eNB or Handover Request message, only " SRVCC to UTRAN/GERAN Operation Possible " field is changed to " possible ".
UE initiates speech business in E-UTRAN; Owing to arrive E-UTRAN network coverage edge; Therefore trigger reporting the isosystem measurement report, Target cell is the UTRAN/GERAN sub-district in the measurement report, and MME issued " SRVCC to UTRAN/GERAN OperationPossible " field and is " possible " before the eNB side was judged; Then trigger the SRVCC process of UE, speech business is switched to the UTRAN/GERAN network to UTRAN/GERAN.
Embodiment 4:
Among this embodiment, the UE ability is supported two kinds of SRVCC processes, but core net is only supported UTRAN/GERAN SRVCC, and switching target small area is that the processing mode sketch map of CDMA2000 1xRTT sub-district is seen Fig. 7.
UE is through " the UE Network Capability " field in NAS signaling Attach Request or the Tracking Area Update Request message and " MS Network Capability " field indication MME, and its ability is supported the SRVCC process of UTRAN/GERAN simultaneously and arrived the SRVCC process of CDMA2000 1xRTT;
MME judgement core net ability is only supported the SRVCC of UTRAN/GERAN; And do not support the SRVCC ability of CDMA2000 1xRTT; After the SRVCC ability of comprehensive UE, in Initial UE Context Setup Request that issues to eNB or Handover Request message, only " SRVCC to UTRAN/GERAN Operation Possible " field is changed to " possible ".
UE initiates speech business in E-UTRAN; Owing to arrive E-UTRAN network coverage edge; Therefore trigger and report the isosystem measurement report; Target cell is CDMA2000 1xRTT sub-district in the measurement report, and to issue " SRVCC to CDMA2000 1x Operation Possible " field be not " possible " to MME before the eNB side was judged, therefore do not trigger the SRVCC process of UE to CDMA2000 1xRTT.
The field that more than is used to show the SRVCC ability of different radio Access Network is merely signal, when specifically realizing, the title of field and the concrete assignment of field is not all done qualification, as long as core net and current wireless Access Network all can correctly be discerned.
Above embodiment describes with the example that switches to of E-UTRAN to UTRAN/GERAN and E-UTRAN to CDMA2000 1xRTT, and is intelligible, as long as relate to the switching between the different radio Access Network, and all applicable the inventive method.
Corresponding to above method, the present invention also provides a kind of speech business call continuity to realize system, and this system comprises:
The ability information of said core net issues module; Be used for confirming and send to the current wireless Access Network the common SRVCC ability information of the UE of said core net and speech business, said common SRVCC ability information shows the SRVCC ability information of different radio Access Network;
The SRVCC of said wireless access network triggers judging module; When said UE initiates to switch; Be used for judgement and whether trigger SRVCC; The SRVCC ability information that wherein said core net issues shows that judgement was triggered to the SRVCC of said Target cell, otherwise does not trigger when the SRVCC ability of the Target cell that the isosystem measurement report is corresponding enabled.
Understandably, corresponding to previous embodiment, the ability information of core net issues module and can realize at the MME network element, and certainly when the MME Network Element Function is provided with variation, this ability information issues module and also can realize in other respective network elements.The SRVCC of wireless access network triggers judging module and realizes at eNB, can have the relevant device of different base stations system to realize that the present invention does not do qualification to this corresponding to different wireless access networks.
Further, said wireless access network comprises E-UTRAN, UTRAN, GERAN or CDMA2000 1xRTT.
Further, the SRVCC ability information that issues of the SRVCC ability information that reports of said UE and said core net adopts and shows or the mode of implicit expression shows the SRVCC ability of different radio Access Network.
Further, the SRVCC ability information that issues of said core net adopts at least two fields to show the SRVCC ability of at least two wireless access networks.
Preferably, said core net issues and carries said common SRVCC ability information when initial context is set up request (Initial UE Context SetupRequest) message or handoff request (Handover Request) message.Further; The SRVCC ability of representing UTRAN/GERAN when said core net adopts SRVCC to UTRAN/GERAN OperationPossible assignment for Possible is represented the SRVCC of CDMA2000 1x when adopting SRVCC to CDMA2000 1x Operation Possible assignment for Possible.
One of ordinary skill in the art will appreciate that all or part of step in the said method can instruct related hardware to accomplish through program, said program can be stored in the computer-readable recording medium, like read-only memory, disk or CD etc.Alternatively, all or part of step of the foregoing description also can use one or more integrated circuits to realize.Correspondingly, each module in the foregoing description can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
Claims (12)
1. speech business call continuity implementation method is characterized in that this method comprises:
Common single continuous voice call (SRVCC) ability information that core net is confirmed and sent the UE of itself and speech business to the current wireless Access Network, said common SRVCC ability information shows the SRVCC ability information of different radio Access Network;
After said UE initiated speech business, said current wireless Access Network judged that the SRVCC ability information that said core net issues shows that judgement was triggered to the SRVCC of said Target cell when the SRVCC ability of the Target cell that the isosystem measurement report is corresponding enabled.
2. the method for claim 1, it is characterized in that: said wireless access network comprises E-UTRAN, UTRAN, GERAN or CDMA20001xRTT.
3. the method for claim 1 is characterized in that: the SRVCC ability information that SRVCC ability information that said UE reports and said core net issue adopts and shows or the mode of implicit expression is represented the SRVCC ability of different radio Access Network.
4. the method for claim 1 is characterized in that: the SRVCC ability information that said core net issues adopts at least two fields to show the SRVCC ability of at least two wireless access networks.
5. the method for claim 1 is characterized in that: carry said common SRVCC ability information when said core net issues initial context foundation request (Initial UE Context Setup Request) message or handoff request (HandoverRequest) message.
6. like claim 1 or 5 described methods; It is characterized in that: represent the SRVCC ability of UTRAN/GERAN when said core net adopts SRVCCto UTRAN/GERAN Operation Possible assignment for Possible, represent the SRVCC of CDMA20001x when adopting SRVCC to CDMA20001x OperationPossible assignment for Possible.
7. a speech business call continuity is realized system, it is characterized in that this system comprises:
The ability information of said core net issues module; Be used for confirming and send to the current wireless Access Network common single continuous voice call (SRVCC) ability information of the UE of said core net and speech business, said common SRVCC ability information shows the SRVCC ability information of different radio Access Network;
The SRVCC of said wireless access network triggers judging module; After said UE initiates speech business; Be used for judgement and whether trigger SRVCC; The SRVCC ability information that wherein said core net issues shows that judgement was triggered to the SRVCC of said Target cell when the SRVCC ability of the Target cell that the isosystem measurement report is corresponding enabled.
8. system as claimed in claim 7 is characterized in that: said wireless access network comprises E-UTRAN, UTRAN/GERAN or CDMA20001xRTT.
9. system as claimed in claim 7 is characterized in that: the SRVCC ability information that SRVCC ability information that said UE reports and said core net issue adopts the mode of demonstration or implicit expression to show the SRVCC ability of different radio Access Network.
10. system as claimed in claim 7 is characterized in that: the SRVCC ability information that said core net issues adopts at least two fields to show the SRVCC ability of at least two wireless access networks.
11. system as claimed in claim 7 is characterized in that: said core net issues and carries said common SRVCC ability information when initial context is set up request (Initial UE Context Setup Request) message or handoff request (HandoverRequest) message.
12. like claim 7 or 11 described systems; It is characterized in that: represent the SRVCC ability of UTRAN/GERAN when said core net adopts SRVCC to UTRAN/GERAN Operation Possible assignment for Possible, represent the SRVCC of CDMA20001x when adopting SRVCC to CDMA20001x OperationPossible assignment for Possible.
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| CN111246530A (en) * | 2020-02-06 | 2020-06-05 | 北京小米移动软件有限公司 | Network switching method and device and storage medium |
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| CN102647693A (en) * | 2011-02-18 | 2012-08-22 | 中兴通讯股份有限公司 | Method and system for realizing radio voice call continuity (RVCC) |
| 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 |
| CN108124513A (en) * | 2017-09-30 | 2018-06-05 | 深圳市云中飞网络科技有限公司 | The falling result detection method and device of CSFB a kind of, computer storage media |
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| CN108419230A (en) * | 2018-02-13 | 2018-08-17 | 广东欧珀移动通信有限公司 | A kind of communication means, base station and storage medium |
| CN110856229A (en) * | 2019-11-21 | 2020-02-28 | 中国联合网络通信集团有限公司 | Network switching method, device and communication system |
| 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 |
| CN111246530A (en) * | 2020-02-06 | 2020-06-05 | 北京小米移动软件有限公司 | Network switching method and device and storage medium |
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