CN1867191A - Method and system for call hold - Google Patents
Method and system for call hold Download PDFInfo
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- CN1867191A CN1867191A CNA2006100327517A CN200610032751A CN1867191A CN 1867191 A CN1867191 A CN 1867191A CN A2006100327517 A CNA2006100327517 A CN A2006100327517A CN 200610032751 A CN200610032751 A CN 200610032751A CN 1867191 A CN1867191 A CN 1867191A
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Abstract
The invention relates to a method for keeping calling, which comprises following steps that: SMSC receives the switch failure information, to keep former communication channel; SMSC sends the message that informing about the MS switch failure to the AMSC; AMSC receives said message, to instruct the target BSC to release built service channel. The invention also provides a relative system, which comprises original BSC, SMSC, AMSC and target BSC, while the original BSC is used to receive the MS switch information and control MS to switch channel; the target BSC is used to build and release the communication channel according to the instruction of AMSC; SMSC is used to send the message that informing about MS switch failure to the AMSC; and the AMSC is used to receive said switch failure message and instruct target BSC to release built service channel. The invention can keep the call continuity when the backward switch is failing, to improve the application effect and the service quality.
Description
Technical field
The present invention relates to a kind of method and system of calling out maintenance, particularly a kind of afterwards under the situation of handoff failure, based on predefined handover cancelling message, make to call out and return the system that former channel carries out and realizes calling out the method that keeps and support this method, belong to the mobile communication technology field.
Background technology
Current, mobile communication business is development and universal constantly, the area coverage of mobile communication signal also enlarges day by day, therefore, operator must guarantee the user in communication process, crosses over base station controller (BaseStation Controller is called for short BSC) even crosses over (the Mobile SwitchCenter of mobile switching centre, be called for short MSC) when moving, occurrence positions can keep the continuation of calling out, reduce cutting off rate.
In the prior art, when move the position that BSC or MSC take place to cross in communication process the user, all adopt the method for direct-cut operation to switch.
At the situation of crossing over BSC, can keep calling out and not interrupt, specifically be divided into handover success and switch to keep calling out under unsuccessful two kinds of situations and do not interrupt.Referring to Fig. 1, the signaling process figure for BSC handover success and maintenance traffic continuation under same MSC or the Visited Location Registor (Visitor Location Register is called for short VLR) may further comprise the steps:
Step 1a, travelling carriage (Mobile Station, abbreviation MS) signal that detects from purpose BSC is better than the source BSC signal of current use and sends measurement report to source BSC, source BSC sends handover request (Handoff Required) message to MSC/VLR, and application is switched;
Step 1b, MSC/VLR send handoff request (HandoffRequest) message to purpose BSC after receiving handover request message, and request purpose BSC sets up air traffic channel and is used for switching;
After step 1c, purpose BSC set up air traffic channel success, return handoff request to MSC/VLR and confirm that (Handoff Request Ack) message shows that air traffic channel sets up successfully;
Step 1d, MSC/VLR send switching command (Handoff Command) message to source BSC, and instruct MS is attempted the Traffic Channel that application target BSC sets up, and simultaneously, MSC/VLR starts timer and waits for handoff completion message;
Step 1e, after purpose BSC detects MS and successfully uses the Traffic Channel of being set up by purpose BSC, show handover success, purpose BSC sends to switch to MSC/VLR and finishes (Handoff Complete) message, timer quits work.
At this moment, switching is finished, and the Traffic Channel of MS application target BSC is carried out service communication, and the call drop phenomenon does not take place therebetween.Further, switch finish after because the speech data of travelling carriage transmits by purpose BSC fully, realize the service interaction with another correspondent, do not needed to keep for the Traffic Channel of source BSC, therefore, further comprising the steps of:
Step 1f, MSC/VLR send clear command (Clear Command) message, the Traffic Channel of source of release BSC to source BSC;
After step 1g, source BSC discharge the Traffic Channel success, return removing to MSC/VLR and finish (ClearComplete) message.
Referring to Fig. 2,, may further comprise the steps for BSC under the same MSC/VRL switches signaling process figure unsuccessful and maintenance traffic continuation:
The signal that step 2a, MS detect from purpose BSC is better than the source BSC signal of current use and sends measurement report to source BSC, and source BSC sends handover request (Handoff Required) message to MSC/VRL, and application is switched;
After step 2c, purpose BSC set up air traffic channel success, return handoff request to MSC/VRL and confirm that (Handoff Request Ack) message shows that air traffic channel sets up successfully;
After step 2g, purpose BSC discharge the Traffic Channel success, return removing to MSC/VRL and finish (ClearComplete) message.
As seen, do not complete successfully though switch, travelling carriage can use the Traffic Channel of source BSC to carry out service communication, and the call drop phenomenon does not take place therebetween.
Wherein, the described A interface of step 2e is the interconnect interface between MSC and the BSC, and the information that this interface transmits comprises travelling carriage and BTS management, mobility and call proceeding management etc.
There is certain problem in switching at crossing over MSC in the prior art.
So-called switching of crossing over MSC, promptly the handoff procedure from a MSC to another MSC is referred to as inter-office switchover.The participation MSC of inter-office switchover comprises controlling MSC (Anchor MSC is called for short AMSC) and service MSC (Serving MSC is called for short SMSC).Wherein, SMSC is current for MS provides the MSC of service, and AMSC is the MSC that MS sets up Traffic Channel during for call setup, and promptly AMSC is used for after receiving handoff request message, and BSC is that MS sets up new Traffic Channel under the indication.Therefore inter-office switchover is divided into specifically again that forward direction from AMSC to SMSC switches and back to switching two kinds of situations from SMSC to AMSC.
For the situation of back to switching, source BSC is in the SMSC coverage, target BS C is in the AMSC coverage, when user MS detects signal from purpose BSC and is better than the signal of source BSC and source BSC and adheres to different MSC separately with purpose BSC, the switching from SMSC to AMSC takes place.Can guarantee the continuity of traffic in the prior art under the situation of handover success in the back, its signaling process figure may further comprise the steps as shown in Figure 3:
The signal that step 3a, MS detect from purpose BSC is better than the signal of source BSC and sends measurement report to source BSC, and source BSC sends handover request (Handoff Required) message to SMSC, and application is switched;
After step 3d, purpose BSC set up the air traffic channel success, return handoff request to AMSC and confirm (Handoff Request Ack) message;
At this moment, switching is finished, and the Traffic Channel of MS application target BSC is carried out service communication, the call drop phenomenon can not take place therebetween.
Further, switch finish after because the speech data of travelling carriage transmits by purpose BSC fully, realize the service interaction with another correspondent, do not needed to keep for the Traffic Channel of source BSC, therefore, further comprising the steps of:
Step 3i, SMSC send clear command (Clear Command) message, the Traffic Channel of source of release BSC to source BSC;
After step 3j, source BSC discharge the Traffic Channel success, return removing to SMSC and finish (ClearComplete) message;
In order afterwards to handoff failure the time, to guarantee the traffic continuity, keep the successional technical scheme of traffic as can be known with reference to the above-mentioned BSC of striding handoff failure: if MS does not successfully capture the service channel that purpose BSC sets up, after detecting, source BSC needs to send switch failure information to SMSC, and indicate and need return former channel, transmit this message by SMSC again and give AMSC; Promptly need through following flow process: source BSC → SMSC → AMSC sends the message that has showed " handoff failure returns former channel " implication successively, in order to stop the timer work of AMSC.
But the interface between MSC and the MSC is an E interface, is the interface between the different MS C of adjacent area, be used for MS from a MSC controlled area to another MSC controlled area time exchange for information about, to finish handover.Owing in this interface protocol, do not define the message that any message specification is transmitted " handoff failure; return a former channel " class, therefore, back when handoff failure from SMSC to AMSC, AMSC will can not receive handoff completion message, can not receive switch failure information yet.
Both do not receiving handoff completion message based on MSC, when also not receiving switch failure information, timer can not quit work automatically and cause overtimely, and MSC is calling out the measure that will take to remove Traffic Channel under the overtime situation.Therefore, when afterwards to handoff failure, AMSC can carry out abnormal protection behind timer expiry handles, and removes whole calling, discharges whole Traffic Channels.Obviously, can't realize that afterwards to handoff failure the time conversation keeps.
In sum, promptly do not support the system of the message of " handoff failure returns former channel " class in the prior art, also do not support the method for the message of " handoff failure; return former channel " class, therefore can't under failed handoff scenario, realize calling out in the back keeping.
Summary of the invention
The objective of the invention is in order to overcome above-mentioned defective, a kind of method of calling out maintenance is proposed, by the transmission of definition handover cancelling message E interface between the different MS C of adjacent area, be implemented in the back under the situation of handoff failure, call out continuing of returning former channel and keep calling out.
Another object of the present invention is in order to overcome above-mentioned defective, a kind of system of calling out maintenance is proposed, transmission by definition handover cancelling message E interface between the different MS C of adjacent area, realization in the back under the situation of handoff failure, call out the support return former channel and to keep calling out the method that continues.For achieving the above object, the invention provides a kind of method of calling out maintenance, travelling carriage switches between source base station controller and purpose base station controller, described source base station controller and purpose base station controller belong to serving mobile switching center and Controlling MSC respectively, may further comprise the steps:
A, described serving mobile switching center receive switch failure information, keep original communication channel;
B, described serving mobile switching center send the information of indication travelling carriage handoff failure to described Controlling MSC;
C, described Controlling MSC receive the information of described indication travelling carriage handoff failure, and indication purpose base station controller discharges the Traffic Channel that it is set up.
The present invention also provides a kind of system of calling out maintenance, comprise source base station controller, serving mobile switching center, Controlling MSC and purpose base station controller, described source base station controller is used for receiving mobile and switches message, and the control travelling carriage carries out the channel switching; Described purpose base station controller is used for setting up and the release communication channel according to the instruction of Controlling MSC, and described serving mobile switching center is used for sending the information of indicating the travelling carriage handoff failure to Controlling MSC; Described Controlling MSC is used to receive the information of described indication travelling carriage handoff failure, and indicates the purpose base station controller to discharge the Traffic Channel that it is set up.
As shown from the above technical solution, the present invention adopts definition handover cancelling message in the MSC interface protocol, by the transmission of this message at E interface, has following beneficial effect:
1, in the back under the situation of handoff failure, kept the continuity of calling out;
2, the service quality of operator and user's result of use have been improved.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Fig. 1 is a BSC handover success and keep the signaling process figure of traffic continuation under the same MSC/VLR in the prior art;
Fig. 2 is a BSC handoff failure and keep the signaling process figure of traffic continuation under the same MSC/VLR in the prior art;
Fig. 3 is back to handover success and the successional signaling process figure of assurance traffic in the prior art;
Fig. 4 calls out the flow chart of embodiment 1 of the method for maintenance for the present invention;
Fig. 5 calls out the flow chart of embodiment 2 of the method for maintenance for the present invention;
Fig. 6 is Fig. 4 or the middle signaling process figure that sets up the back to switching embodiment illustrated in fig. 5;
Fig. 7 is complete signaling process figure embodiment illustrated in fig. 5;
Fig. 8 calls out the schematic diagram of embodiment of the system of maintenance for the present invention.
Embodiment
The present invention calls out the embodiment 1 of the method that keeps under the situation of handoff failure in the back, referring to Fig. 4, MS switches between source BSC and purpose BSC, and this source BSC and purpose BSC belong to SMSC and AMSC respectively, specifically may further comprise the steps:
After step 103, AMSC received the information of this instruct MS handoff failure, control purpose BSC discharged the Traffic Channel that it is set up.
As seen, by above-mentioned steps, handover cancelling message can pass to AMSC by SMSC, because AMSC can receive and identify this handover cancelling message in the present embodiment, has therefore avoided causing conversation to be removed owing to communicating.
Better embodiment 2 of the present invention is on the basis of embodiment 1, and the conversation after specifically avoiding by the control switching timer when handoff failure is removed, and referring to Fig. 5, may further comprise the steps:
When step 201, MS successfully do not catch the Traffic Channel of purpose base station controller foundation, return original communication channel and communicate, and send handoff failure (Handoff Failure) message to the source base station controller;
Step 202, source BSC send handoff failure (Handoff Failure) message to SMSC;
Step 203, SMSC receive handoff failure (Handoff Failure) message, keep original communication channel;
Step 204, SMSC send indication handover cancelling message HANDCANCEL to AMSC;
Step 205, AMSC return handover cancelling response message (handcancel) to SMSC, and the handover cancelling response message is the response message of this indication travelling carriage handoff failure information; By this handover cancelling response message, guarantee that on flow process AMSC has received handover cancelling message, if SMSC does not receive this handover cancelling response message within a certain period of time, then can take to resend accordingly operation, the certain hour of mentioning here must be removed the overtime qualification of conversation less than the AMSC timer;
Step 206, AMSC remove switching timer, this switching timer receives purpose BSC at AMSC and sets up and start when Traffic Channel is finished Indication message, arrive purpose BSC at the MS successful switch, or, when AMSC receives the information of indication travelling carriage handoff failure, stop timing, avoided the situation of removing by conversation under the timer-operated situation;
Step 207, AMSC send clear command (Clear Command) message to purpose BSC, and described purpose BSC discharges the Traffic Channel of described foundation, in order to avoid take too much system resource.
After the step 207, the step of return instruction can also be set, AMSC can be known remove the message of finishing, specific as follows:
After step 208, described purpose BSC discharge the Traffic Channel success, return removing to AMSC and finish (Clear Complete) message.
Wherein, embodiment 1 and 2 has finished back transmission to handoff failure information by predefined handover cancelling message.Any signaling message form that this handover cancelling message can adopt MSC to discern defines realization.In TCP/IP signaling and signalling system No.7, to be defined as example; Following form is followed in the definition of message in the above-mentioned signaling:
Message header+source address+destination address+application layer messages+...;
Application layer messages is made of message name/Digital ID, and each Digital ID all has clear and definite implication, and when the Digital ID in the MSC identification application layer messages, the information that just can understand wherein to be comprised is also operated accordingly.Therefore, definition handover cancelling message in the E interface agreement of SMSC and AMSC in advance in this example, as the step of HANDCANCEL can for:
Searching the Digital ID that is not used by other message name as yet in the described E interface agreement, such as 99, certainly, also can be other Digital ID that is not used;
Set up linking of handover cancelling message and described Digital ID, promptly these Digital ID 99 correspondences is exactly handover cancelling message;
Preserving described handover cancelling message and Digital ID 99 in SMSC and AMSC, further, is that the correspondence relationship information between handover cancelling message, Digital ID 99 and handover cancelling message and the Digital ID 99 is kept in the application layer messages.
Like this, by carrying out the definition of handover cancelling message, finished the matching treatment of handover cancelling message and Digital ID.When AMSC received HANDCANCEL message, can discern its implication was handover cancelling, therefore, had avoided causing conversation to be removed owing to communicating.
Because embodiment 1 and 2 is treatment steps that take the back, before step 101 or step 201, comprise also and set up the back therefore that its signaling process figure is specially as shown in Figure 6 to the step of switching when handoff failure:
The signal that 4a, MS detect from purpose BSC is better than the signal of source BSC and sends measurement report to source BSC, and source BSC sends handover request (Handoff Required) message to SMSC, and application is switched;
4b, SMSC send the back to handoff request (HANDBACK2) message to the AMSC at purpose BSC place after receiving handover request message;
4c, AMSC receive that the back sends handoff request (HandoffRequest) message to purpose BSC after handoff request message, and request purpose BSC sets up air traffic channel and is used for switching;
After 4d, purpose BSC set up the air traffic channel success, return handoff request to AMSC and confirm (HandoffRequest Ack) message;
4e, AMSC send the back to SMSC and confirm (handback2) message to handoff request, and the Traffic Channel of notice SMSC purpose BSC is set up successfully, and while AMSC starts timer and waits for handoff completion message;
4f, SMSC send switching command (Handoff Command) message to source BSC, and instruct MS is attempted the Traffic Channel that application target BSC sets up.
Referring to Fig. 7, for embodiments of the invention 2 are called out the complete signaling process figure of maintenance method, because after the step 4f, MS does not successfully catch the Traffic Channel that purpose BSC sets up, return handoff failure (Handoff Failure) message to source BSC, and remain on the session of former Traffic Channel, therefore, following step is:
4g, source BSC return handoff failure (Handoff Failure) message to SMSC;
4h, SMSC send handover cancelling message HANDCANCEL to AMSC;
4i, AMSC send handover cancelling response message handcancel to SMSC;
4j, AMSC send clear command (Clear Command) message to purpose BSC;
After 4k, purpose BSC discharge the Traffic Channel success, return removing to AMSC and finish (ClearComplete) message.
Referring to Fig. 8, call out the schematic diagram of embodiment of the system of maintenance for the present invention, comprise source BSC11, the SMSC12, AMSC13 and the purpose BSC14 that connect successively; This source BSC11 is used to receive MS and switches message, and control MS carries out the channel switching; Purpose BSC14 is used for setting up and the release communication channel according to the instruction of AMSC13.
This SMSC12 is used for sending to AMSC13 the information of instruct MS handoff failure, such as handover cancelling message HANDCANCEL;
This AMSC13 is used to receive the information of this instruct MS handoff failure, such as handover cancelling message HANDCANCEL; And indication purpose BSC14 discharges the Traffic Channel that it is set up.
Like this, by defining handover cancelling message HANDCANCEL in the E interface between SMSC12, AMSC13 in advance, realize that handover cancelling message HANDCANCEL can pass to AMSC13 by SMSC12, carry out information interaction, AMSC13 avoids carrying out the channel dismantling operation by this handover cancelling message of identification.
Can be provided with among the AMSC13 according to the switching timer (not shown) of described handover cancelling message control time status and avoid carrying out the channel dismantling operation, be specially: AMSC13 is by this handover cancelling message of identification HANDLE, control the operation that its switching timer takes timing to stop, having avoided causing conversation to be removed owing to communicating.
In the present embodiment, connect by the E interface of supporting handover cancelling message HANDCANCEL between SMSC12 and the AMSC13.
In the present embodiment, this E interface can also define the handover cancelling response message handcancel that AMSC13 sends to SMSC12, this handover cancelling response message is the response message at this instruct MS handoff failure information, guarantees that on flow process AMSC13 has received handover cancelling message.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the spirit and scope of technical solution of the present invention.
Claims (6)
1, a kind of method of calling out maintenance, it is characterized in that, travelling carriage switches between source base station controller and purpose base station controller, and described source base station controller and purpose base station controller belong to serving mobile switching center and Controlling MSC respectively, may further comprise the steps:
A, described serving mobile switching center receive switch failure information, keep original communication channel;
B, described serving mobile switching center send the information of indication travelling carriage handoff failure to described Controlling MSC;
C, described Controlling MSC receive the information of described indication travelling carriage handoff failure, and indication purpose base station controller discharges the Traffic Channel that it is set up.
2, the method for claim 1 is characterized in that, before the described step a, further comprises:
When a1, described travelling carriage are not successfully caught the Traffic Channel of purpose base station controller foundation, return original communication channel and communicate, and send switch failure information to the source base station controller;
A2, described source base station controller send switch failure information to described serving mobile switching center.
3, the method for claim 1 is characterized in that, Controlling MSC receives after the information of described indication travelling carriage handoff failure among the described step c, also comprises:
C1, described Controlling MSC send the response message of indication travelling carriage handoff failure information to described serving mobile switching center;
C2, described Controlling MSC are removed switching timer.
4, method as claimed in claim 3, it is characterized in that, described switching timer receives the purpose base station controller at Controlling MSC and sets up and start when Traffic Channel is finished Indication message, arrive the purpose base station controller at the portable terminal successful switch, or, when Controlling MSC receives the information of indication travelling carriage handoff failure, stop timing.
5, a kind of calling keeps system, comprises source base station controller, serving mobile switching center, Controlling MSC and purpose base station controller, and described source base station controller is used for receiving mobile and switches message, and the control travelling carriage carries out the channel switching; Described purpose base station controller is used for setting up and the release communication channel according to the instruction of Controlling MSC, it is characterized in that,
Described serving mobile switching center is used for sending the information of indicating the travelling carriage handoff failure to Controlling MSC;
Described Controlling MSC is used to receive the information of described indication travelling carriage handoff failure, and indicates the purpose base station controller to discharge the Traffic Channel that it is set up.
6, a kind of calling as claimed in claim 5 keeps system, it is characterized in that described Controlling MSC also is used for returning to serving mobile switching center the response message of described indication travelling carriage handoff failure information.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100327517A CN100525534C (en) | 2006-01-05 | 2006-01-05 | Method and system for call hold |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100327517A CN100525534C (en) | 2006-01-05 | 2006-01-05 | Method and system for call hold |
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| Publication Number | Publication Date |
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| CN1867191A true CN1867191A (en) | 2006-11-22 |
| CN100525534C CN100525534C (en) | 2009-08-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006100327517A Expired - Fee Related CN100525534C (en) | 2006-01-05 | 2006-01-05 | Method and system for call hold |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101459738B (en) * | 2007-12-14 | 2011-06-08 | 华为技术有限公司 | Processing method, system and device for call holding sound |
| CN101299878B (en) * | 2007-04-30 | 2011-09-14 | 华为技术有限公司 | Method for monitoring channel switching process as well as terminal |
| CN102215569A (en) * | 2010-04-12 | 2011-10-12 | 华为技术有限公司 | Circuit switched fall back (CSFB) process notification method and device |
| CN104380818A (en) * | 2012-06-28 | 2015-02-25 | 苹果公司 | Responding to a page message |
-
2006
- 2006-01-05 CN CNB2006100327517A patent/CN100525534C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101299878B (en) * | 2007-04-30 | 2011-09-14 | 华为技术有限公司 | Method for monitoring channel switching process as well as terminal |
| CN101459738B (en) * | 2007-12-14 | 2011-06-08 | 华为技术有限公司 | Processing method, system and device for call holding sound |
| CN102215569A (en) * | 2010-04-12 | 2011-10-12 | 华为技术有限公司 | Circuit switched fall back (CSFB) process notification method and device |
| CN104380818A (en) * | 2012-06-28 | 2015-02-25 | 苹果公司 | Responding to a page message |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100525534C (en) | 2009-08-05 |
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