CN1798427A - Method for switching languages - Google Patents
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- CN1798427A CN1798427A CN 200410101602 CN200410101602A CN1798427A CN 1798427 A CN1798427 A CN 1798427A CN 200410101602 CN200410101602 CN 200410101602 CN 200410101602 A CN200410101602 A CN 200410101602A CN 1798427 A CN1798427 A CN 1798427A
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Abstract
The method for use in supporting two modes mobile phone based on WLAN and 2G/3G network to make switch from the voice of WLAN to the voice of 2G/3G includes following steps: after the two modes mobile phone builds VoWLAN link with called party through relay gateway, detects the two modes mobile phone to decide if it leaves the area covered by WLAN; if yes, the soft exchange builds 2G/3G link with the two modes mobile phone through relay gateway and 2G/3G network, and then connects the 2G/3G link to the link between the relay gateway and the called party to implement the voice switch.
Description
Technical field
The present invention relates to cordless communication network, refer to the method that dual-mode handset switches to the conversation of 2G/3G voice-over-net from wlan voice conversation (VoWLAN) especially.
Background technology
Along with the maturation of VoIP (Voice over IP, ip voice) technology and WLAN (Wireless Local AreaNetwork, WLAN (wireless local area network)) technology, integrated VoWLAN module becomes the focus that industry is paid close attention in the 2G/3G mobile phone.Leading cell phone manufacturer has all announced to develop the dual-mode handset plan of integrated VoWLAN module.Some operators wish that also the user utilizes dual-mode handset to be linked into the IP network of operator at the WLAN focus, provides rate cheap VoIP business by soft switch for the user.Because the WLAN hotspot range is limited, also require the terminal use can when withdrawing from hotspot range, can also use network such as 2G/3G to communicate technically; Under talking state, also want to take over seamlessly the 2G/3G network from VoWLAN and continue conversation.
Yet the method for switching languages that does not also propose a kind of maturation in the prior art realizes that dual-mode handset switches to the 2G/3G voice-over-net from VoWLAN, causes dual-mode handset communication effect difference after leaving the local area network (LAN) focus maybe can't communicate by letter.
Summary of the invention
The invention provides a kind of method that realizes that dual-mode handset switches to the 2G/3G voice-over-net from VoWLAN, to solve the dual-mode handset problem that the communication effect difference maybe can't be communicated by letter after leaving the local area network (LAN) focus in the prior art.
The dual-mode handset that the inventive method is adapted to support WLAN (wireless local area network) and 2G/3G net is from based on the switching to 2G/3G net voice of the voice (VoWLAN) of WLAN (wireless local area network), this method comprises: after described dual-mode handset is by Tandem Gateway and the called VoWLAN of setting up path, carry out the following step:
A: confirm that this dual-mode handset has left the wireless lan (wlan) focus;
B: soft switch is set up the 2G/3G path by Tandem Gateway and 2G/3G network with this dual-mode handset;
C: soft switch is connected 2G/3G path and the Tandem Gateway set up to called subscriber's path, realize that voice switch.
In the described steps A, whether online by send heartbeat message to dual-mode handset if detecting dual-mode handset in soft switch, and confirm that this dual-mode handset has left the WLAN focus when detecting less than the receiveing the response of dual-mode handset.
Determine according to the speech quality of dual-mode handset whether this dual-mode handset has left the WLAN focus in the described steps A, and notice soft switch when definite dual-mode handset has left the WLAN focus.
According to said method of the present invention, when the user determines that according to current sound effect dual-mode handset has left the WLAN focus, send handoff request to soft switch by manual operation; Perhaps, when dual-mode handset is determined to have left the WLAN focus by detecting current speech quality automatically, send handoff request from the trend soft switch.
Dual-mode handset determines whether to have left the WLAN focus automatically by following step:
A1: dual-mode handset detects the signal to noise ratio of current access point;
A2: judge whether described signal to noise ratio is reduced to the Cell searching threshold value of setting, if then continue step a3, otherwise change step a1;
A3: dual-mode handset begins to start the access point of searching near, and in contiguous access point that will search and the contiguous access point tabulation of corresponding signal to noise ratio information stores to thereof;
A4: dual-mode handset is judged when the signal to noise ratio of current access point is reduced to the sub-district switching threshold of setting, search in the described contiguous access point tabulation whether the access point of signal to noise ratio greater than the sub-district switching threshold is arranged, if have, the WLAN of dual-mode handset connection just automatically switches on this access point; Otherwise confirm that this dual-mode handset has left the WLAN focus.
After confirming that dual-mode handset has left the WLAN focus, dual-mode handset is to user's display reminding information.
According to said method of the present invention, described manual operation is meant presses the switching push button that is arranged on the dual-mode handset or sends switching command by menu mode.
According to said method of the present invention, carry the handoff request that described dual-mode handset sends to soft switch by the INFO of expanding session initiation protocol.
According to said method of the present invention, described step B comprises:
B1: as called number, the mobile switch by Tandem Gateway and 2G/3G network makes a call to dual-mode handset the VoWLAN number that this dual-mode handset is used in soft switch as the 2G/3G network No. sign indicating number of calling number, this dual-mode handset;
B2: dual-mode handset is according to described call prompt user call accepted or call accepted automatically, to set up the 2G/3G path.
Whether soft switch is communicated by letter with attaching position register by signalling system No.7 earlier before carrying out step B1, can reach with the 2G/3G network No. sign indicating number of confirming dual-mode handset.
Among the described step B2, when dual-mode handset judges that the calling number of calling out from 2G/3G is not the VoWLAN number of self, then shield this calling.
If dual-mode handset does not leave the WLAN focus, then keep the VoWLAN passage of foundation in the described steps A, carry out the VoWLAN conversation.
If during the VoWLAN conversation, dual-mode handset is received the calling from the 2G/3G net again, then point out user's call accepted or call accepted automatically; And can switch in VoWLAN conversation and the circulation of 2G/3G call office.
Among the described step C, after 2G/3G path of setting up and Tandem Gateway are connected to called subscriber's path, discharge the VoWLAN path of original foundation.
The beneficial effect that technical solution of the present invention is brought is as follows:
1, dual-mode handset can at the WLAN focus, can adopt the VoWLAN conversation at wlan network and 2G/3G inter-network roaming, saves telephone expenses; When the user left the WLAN focus, dual-mode handset can take over seamlessly between VoWLAN and 2G/3G, guaranteed that user's conversation is not interrupted.
2, dual-mode terminal supports manual switchover and automatic switchover, auto-pickup, the non-switching of shielding 2G/3G to call out and support 2G/3G and VoWLAN to call out characteristics such as existence simultaneously, and is user-friendly.
3, the present invention adopts the method based on automatic access point searching, judges that accurately dual-mode handset is leaving the WLAN focus, in time starts and switches, and satisfy requirement that speech switch less than 50ms switching time.
Description of drawings
Fig. 1 is the inventive method flow chart;
Fig. 2 switches one of schematic diagram for path of the present invention;
Fig. 3 switches two of schematic diagram for path of the present invention;
Fig. 4 changes schematic diagram for the automatic access point searching signal to noise ratio of the present invention;
Fig. 5 for the present invention from VoWLAN to 2G/3G hand off signaling sequential chart.
Embodiment
Dual-mode handset has two conversation modules: VoWLAN module and 2G/3G module.The VoWLAN module inserts the IP broadband networks by AP (Access Point, access point), and registering in soft switch becomes VoWLAN user, and its corresponding number resource is the VoWLAN number.The 2G/3G module of dual-mode handset inserts mobile network by the 2G/3G base station, registers at HLR (attaching position register), becomes 2G/3G user, and its corresponding number is MSISDN (Mobile station international ISDN number; The 2G/3G phone number) number.
Referring to Fig. 1,, comprise the steps: for the inventive method flow chart
Step 11: dual-mode handset is by first Trunk Media Gateway and the called VoWLAN path of setting up;
Step 12: confirm whether described dual-mode handset has left the WLAN focus; If not, execution in step 13, if, execution in step 14;
Step 13: keep the VoWLAN path, carry out the VoWLAN conversation, do not carry out voice and switch;
Step 14: start voice and switch, soft switch is set up the 2G/3G path by second Trunk Media Gateway and 2G/3G network with this dual-mode handset;
Step 15: soft switch is connected the 2G/3G path and first Trunk Media Gateway set up to called subscriber's path, realize that voice switch.
In the said method step, first Trunk Media Gateway can be same physical entity gateway or different physical entity gateways with second Trunk Media Gateway.
Below in conjunction with accompanying drawing the inventive method step is elaborated.
Dual-mode handset is when the WLAN hotspot range, and the user can preferentially adopt VoWLAN to carry out the VoIP conversation, and as Fig. 2, shown in Figure 3, the VoWLAN module of dual-mode handset is by Trunk Media Gateway TMG1 and PSTN (Public Switch Telephone Network; Public switch telephone network) base is conversed.
After the VoWLAN conversation is set up, need to confirm whether dual-mode handset has left the WLAN focus, and one of method sees also Fig. 2, and soft switch periodically sends heartbeat message to dual-mode handset, and whether detect dual-mode handset online.When the user left the WLAN focus in conversation after, the IP path can interrupt between dual-mode handset and the soft switch, can not respond the heartbeat message of soft switch; Soft switch can not receive receiveing the response of dual-mode handset, thinks that dual-mode handset is not online, can confirm that dual-mode handset has left the WLAN focus.
Two of method sees also Fig. 3, for another kind confirms whether dual-mode handset has left the method for WLAN focus, detects the current talking quality by dual-mode handset, if the speech quality variation thinks that then dual-mode handset is away from the WLAN focus.
Concrete detection method sees also Fig. 4, and dual-mode handset judges by automatic search AP mechanism whether dual-mode handset is leaving the WLAN focus.Transverse axis is the dual-mode handset moving direction among the figure, and the longitudinal axis is a signal to noise ratio (snr).Initial dual-mode handset is connected with AP1 (access point 1), and when dual-mode handset was mobile from left to right along transverse axis, the signal to noise ratio between dual-mode handset and AP1 reduced.When dual-mode handset moves to position shown in 1, when the signal to noise ratio between dual-mode handset and the AP1 is reduced to Cell searching threshold value (Cell Search Threshold), dual-mode handset is thought and is left AP1, at this moment begin to start searching near AP, and set up contiguous AP tabulation, contiguous AP and the corresponding signal to noise ratio that searches is stored in the described contiguous AP tabulation.When dual-mode handset continues when X moves right, the signal to noise ratio between dual-mode handset and the AP1 continues to reduce.When dual-mode handset moves to position shown in 2, when the signal to noise ratio between dual-mode handset and the AP1 is reduced to sub-district switching threshold (Cell Switching Threshold), if in the contiguous AP tabulation the contiguous AP (as AP2) of signal to noise ratio greater than the sub-district switching threshold arranged, the WLAN connection of dual-mode handset just switches on the AP2, this moment, dual-mode handset was also at wlan network, so need not start the voice switching flow; If there is not the better contiguous AP of signal in the contiguous AP tabulation, confirm that then dual-mode handset is leaving wlan network, need to start the voice switching flow.
Wherein, start the voice switching and can adopt manual and automatic dual mode.
Manual mode is: when dual-mode handset detects the signal quality variation, need carry out voice when switching, to user's display reminding information; The user can be by pressing the switching push button that is arranged on the dual-mode handset or sending switching command by menu mode, start the voice switching flow, send handoff request message by dual-mode handset to soft switch, this handoff request message adopts SIP (Session Initiation Protocol, session initiation protocol) protocol of I NFO message (a kind of technology of Session Initiation Protocol, be used for transmitting interaction content in call proceeding) expansion realize, band user switch indication shows that the user forces to switch in INFO.
Automated manner is: when dual-mode handset detects the signal quality variation, in the time of need carrying out the voice switching, send handoff request message by dual-mode handset from the trend soft switch.Band bad voice indication shows that mobile phone automaticallyes switch in the INFO.
After handoff request message is received in soft switch, need set up the 2G/3G passage of this dual-mode handset, and the 2G/3G path and first Trunk Media Gateway set up are connected to called subscriber's path,, realize that voice switch as Fig. 2, shown in Figure 3.Wherein, shown in Figure 2 is to report by the detection of heartbeat message whether current dual-mode handset has left the WLAN focus, therefore, send the delay time of the length influence switching in heartbeat message cycle, though can be by shortening the time that the heartbeat message cycle accelerates to switch, but a lot of users are supported in soft switch if desired, then might have performance bottleneck.Shown in Figure 3 is to report by the current signal quality of dual-mode handset detection to leave the WLAN focus whether, has overcome the shortcoming of Fig. 2 switching mode fully, can realize VoWALN taking over seamlessly to the 2G/3G voice.
The inventive method Signalling exchange schematic diagram as shown in Figure 5, among the figure:
" 1 " expression dual-mode handset is set up WLAN with AP and is connected;
" 2 " expression dual-mode handset VoWLAN module is conversed by Tandem Gateway 1 and PSTN base under soft switch control;
" 3 " expression dual-mode handset starts voice by manual or automated manner and switches, and sends handoff request message to soft switch;
Whether " 4 " expression soft switch is online to HLR (attaching position register) and MSC (mobile switch) inquiry dual-mode handset 2G/3G module by Signaling System Number 7;
" 5 " expression HLR and MSC return whether online information of dual-mode handset 2G/3G module;
" 6 " if expression is online, 2 preparations of soft switch command auto repeat gateway are established to the connection of dual-mode handset;
" 7 " expression Tandem Gateway 2 is ready to soft switch report connection;
" 8 " expression soft switch is called out dual-mode handset by MSC, and main calling out the numbers is the VoWLAN number, and being called out the numbers is MSISDN;
" 9 " expression MSC calls out dual-mode handset, and main calling out the numbers is the VoWLAN number;
" 10 " expression dual-mode handset 2G/3G module receives connection;
" 11 " expression dual-mode handset is set up the 2G/3G voice and is connected;
" 12 " expression SoftSwitch is hung up the VoWLAN path of dual-mode handset;
" 13 " expression dual-mode handset confirms to hang up the VoWLAN path;
The path that " 14 " expression soft switch control Tandem Gateway 1 will arrive the PSTN base switches on the 2G/3G path of Tandem Gateway 2 foundation;
" 15 " expression Tandem Gateway 1 is finished the switching of path;
" 16 " expression dual-mode handset 2G/3G voice module continues conversation by Tandem Gateway (TMG1) and PSTN base.
After the dual-mode handset that described above is is in the VoWLAN conversation leaves the WLAN hot spot region, the complete procedure of switching to the 2G/3G voice.Certainly, dual-mode handset switches with regard to not needing to carry out voice if do not leave the WLAN focus, continues the original VoWLAN path of setting up of protection, carries out the VoWLAN conversation.Dual-mode handset if receive from the calling of 2G/3G net, then can mask this calling during carrying out normal VoWLAN conversation, promptly can hang up 2G/3G automatically and call out, and guarantees that the VoWLAN conversation is unaffected; Also can point out user's call accepted or call accepted automatically; And can switch in VoWLAN conversation and the circulation of 2G/3G call office.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (14)
1, a kind of method for switching languages, the dual-mode handset that is adapted to support WLAN (wireless local area network) and 2G/3G net is from based on the switching to 2G/3G net voice of the voice (VoWLAN) of WLAN (wireless local area network), it is characterized in that after described dual-mode handset is by Tandem Gateway and the called VoWLAN of setting up path, carry out the following step:
A: confirm that this dual-mode handset has left the wireless lan (wlan) focus;
B: soft switch is set up the 2G/3G path by Tandem Gateway and 2G/3G network with this dual-mode handset;
C: soft switch is connected 2G/3G path and the Tandem Gateway set up to called subscriber's path, realize that voice switch.
2, method for switching languages as claimed in claim 1, it is characterized in that, in the described steps A, whether online by send heartbeat message to dual-mode handset if detecting dual-mode handset in soft switch, and confirm that this dual-mode handset has left the WLAN focus when detecting less than the receiveing the response of dual-mode handset.
3, method for switching languages as claimed in claim 1 is characterized in that, determines according to the speech quality of dual-mode handset whether this dual-mode handset has left the WLAN focus in the described steps A, and notice soft switch when definite dual-mode handset has left the WLAN focus.
4, method as claimed in claim 3 is characterized in that, when the user determines that according to current sound effect dual-mode handset has left the WLAN focus, sends handoff request by manual operation to soft switch; Perhaps, when dual-mode handset is determined to have left the WLAN focus by detecting current speech quality automatically, send handoff request from the trend soft switch.
5, method for switching languages as claimed in claim 4 is characterized in that, dual-mode handset determines whether to have left the WLAN focus automatically by following step:
A1: dual-mode handset detects the signal to noise ratio of current access point;
A2: judge whether described signal to noise ratio is reduced to the Cell searching threshold value of setting, if then continue step a3, otherwise change step a1;
A3: dual-mode handset begins to start the access point of searching near, and in contiguous access point that will search and the contiguous access point tabulation of corresponding signal to noise ratio information stores to thereof;
A4: dual-mode handset is judged when the signal to noise ratio of current access point is reduced to the sub-district switching threshold of setting, search in the described contiguous access point tabulation whether the access point of signal to noise ratio greater than the sub-district switching threshold is arranged, if have, the WLAN of dual-mode handset connection just automatically switches on this access point; Otherwise confirm that this dual-mode handset has left the WLAN focus.
6, method for switching languages as claimed in claim 5 is characterized in that, after confirming that dual-mode handset has left the WLAN focus, dual-mode handset is to user's display reminding information.
7, method for switching languages as claimed in claim 4 is characterized in that, described manual operation is meant presses the switching push button that is arranged on the dual-mode handset or send switching command by menu mode.
8, as claim 5 or 7 described method for switching languages, it is characterized in that: the INFO by the expansion session initiation protocol carries the handoff request that described dual-mode handset sends to soft switch.
9, method for switching languages as claimed in claim 1 is characterized in that, described step B comprises:
B1: as called number, the mobile switch by Tandem Gateway and 2G/3G network makes a call to dual-mode handset the VoWLAN number that this dual-mode handset is used in soft switch as the 2G/3G network No. sign indicating number of calling number, this dual-mode handset;
B2: dual-mode handset is according to described call prompt user call accepted or call accepted automatically, to set up the 2G/3G path.
Whether 10, method for switching languages as claimed in claim 9 is characterized in that, carries out the preceding soft switch of step B1 and communicates by letter with attaching position register by signalling system No.7 earlier, can reach with the 2G/3G network No. sign indicating number of confirming dual-mode handset.
11, method for switching languages as claimed in claim 10 is characterized in that, among the described step B2, when dual-mode handset judges that the calling number of calling out from 2G/3G is not the VoWLAN number of self, then shields this calling.
12, method for switching languages as claimed in claim 1 is characterized in that, if dual-mode handset does not leave the WLAN focus, then keeps the VoWLAN passage of foundation in the described steps A, carries out the VoWLAN conversation.
13, method for switching languages as claimed in claim 12 is characterized in that: if during the VoWLAN conversation, dual-mode handset is received the calling from the 2G/3G net again, then point out user's call accepted or call accepted automatically; And can switch in VoWLAN conversation and the circulation of 2G/3G call office.
14, method for switching languages as claimed in claim 1 is characterized in that: among the described step C, after 2G/3G path of setting up and Tandem Gateway are connected to called subscriber's path, discharge the VoWLAN path of original foundation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004101016022A CN100417278C (en) | 2004-12-21 | 2004-12-21 | Method for switching languages |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004101016022A CN100417278C (en) | 2004-12-21 | 2004-12-21 | Method for switching languages |
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| Publication Number | Publication Date |
|---|---|
| CN1798427A true CN1798427A (en) | 2006-07-05 |
| CN100417278C CN100417278C (en) | 2008-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004101016022A Expired - Fee Related CN100417278C (en) | 2004-12-21 | 2004-12-21 | Method for switching languages |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101720132A (en) * | 2009-12-23 | 2010-06-02 | 宇龙计算机通信科技(深圳)有限公司 | WLAN-based communication method and WLAN network equipment |
| CN104541552A (en) * | 2012-07-20 | 2015-04-22 | 奥林奇公司 | Management of roaming in a communication network as a function of a credits usage profile |
| WO2016101179A1 (en) * | 2014-12-24 | 2016-06-30 | Telefonaktiebolaget Lm Ericsson (Publ) | Vowlan call handover method, ue and core network node |
| CN106559848A (en) * | 2015-09-30 | 2017-04-05 | 苹果公司 | For enhanced handover mechanism and the devices, systems and methods of cell reselection |
| CN106900021A (en) * | 2017-02-20 | 2017-06-27 | 惠州Tcl移动通信有限公司 | A kind of processing method and system of mobile terminal VoWiFi calls |
| CN107277876A (en) * | 2017-08-04 | 2017-10-20 | 广东欧珀移动通信有限公司 | Method for switching network, device and terminal device |
| CN107852656A (en) * | 2016-04-29 | 2018-03-27 | 华为技术有限公司 | A kind of call handover method, terminal device and storage medium |
| WO2018095079A1 (en) * | 2016-11-25 | 2018-05-31 | 中兴通讯股份有限公司 | Method and apparatus for switching voice service, mobile terminal and computer storage medium |
| CN110599705A (en) * | 2019-09-09 | 2019-12-20 | 南京东屋电气有限公司 | Method and system for tracking cash box of automatic teller machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1479493A (en) * | 2002-08-31 | 2004-03-03 | 深圳市中兴通讯股份有限公司 | Interconnectioin system |
| EP1602201A2 (en) * | 2003-03-12 | 2005-12-07 | Persona Software, Inc. | Extension of a local area phone system to a wide area network with handoff |
| CN1549634A (en) * | 2003-05-09 | 2004-11-24 | �ʼҷ����ֵ��ӹɷ�����˾ | System and method for seamless roaming between radio wide area net and radio local area net |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101720132A (en) * | 2009-12-23 | 2010-06-02 | 宇龙计算机通信科技(深圳)有限公司 | WLAN-based communication method and WLAN network equipment |
| CN104541552B (en) * | 2012-07-20 | 2018-08-10 | 奥林奇公司 | Management according to telephone expenses service condition to being roamed in communication network |
| CN104541552A (en) * | 2012-07-20 | 2015-04-22 | 奥林奇公司 | Management of roaming in a communication network as a function of a credits usage profile |
| WO2016101179A1 (en) * | 2014-12-24 | 2016-06-30 | Telefonaktiebolaget Lm Ericsson (Publ) | Vowlan call handover method, ue and core network node |
| US10057829B2 (en) | 2014-12-24 | 2018-08-21 | Telefonaktiebolaget Lm Ericsson (Publ) | VoWLAN call handover method, UE and core network node |
| CN106559848A (en) * | 2015-09-30 | 2017-04-05 | 苹果公司 | For enhanced handover mechanism and the devices, systems and methods of cell reselection |
| CN106559848B (en) * | 2015-09-30 | 2020-04-03 | 苹果公司 | Apparatus, system and method for enhanced handover mechanism and cell reselection |
| CN107852656B (en) * | 2016-04-29 | 2020-07-24 | 华为技术有限公司 | Call switching method, terminal equipment and storage medium |
| CN107852656A (en) * | 2016-04-29 | 2018-03-27 | 华为技术有限公司 | A kind of call handover method, terminal device and storage medium |
| US10819850B2 (en) | 2016-04-29 | 2020-10-27 | Huawei Technologies Co., Ltd. | Call switching method, terminal device, and storage medium |
| WO2018095079A1 (en) * | 2016-11-25 | 2018-05-31 | 中兴通讯股份有限公司 | Method and apparatus for switching voice service, mobile terminal and computer storage medium |
| CN106900021A (en) * | 2017-02-20 | 2017-06-27 | 惠州Tcl移动通信有限公司 | A kind of processing method and system of mobile terminal VoWiFi calls |
| CN106900021B (en) * | 2017-02-20 | 2020-08-11 | 惠州Tcl移动通信有限公司 | VoWiFi call processing method and system for mobile terminal |
| US10798629B2 (en) | 2017-02-20 | 2020-10-06 | Tcl Communications (Ningbo) Co., Ltd. | VoWifi call processing method of mobile terminal, system, and mobile terminal |
| CN107277876A (en) * | 2017-08-04 | 2017-10-20 | 广东欧珀移动通信有限公司 | Method for switching network, device and terminal device |
| CN110599705A (en) * | 2019-09-09 | 2019-12-20 | 南京东屋电气有限公司 | Method and system for tracking cash box of automatic teller machine |
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| CN100417278C (en) | 2008-09-03 |
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