CN1112814C - Method for reducting message loss rate by call protection - Google Patents
Method for reducting message loss rate by call protection Download PDFInfo
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- CN1112814C CN1112814C CN 99120200 CN99120200A CN1112814C CN 1112814 C CN1112814 C CN 1112814C CN 99120200 CN99120200 CN 99120200 CN 99120200 A CN99120200 A CN 99120200A CN 1112814 C CN1112814 C CN 1112814C
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Abstract
The present invention discloses a method for reducing message loss rate by call protection. When a main or prepared machine of a main storage controller (MSC) is switched, the main or prepared machine process relevant modules with the call of a user in a conversation or ringing state. When the call of the TUP and ISUP of the original signaling No. 7 and a China signaling No. 1 is protected, call protection processing for a BSSAP application layer is added, and particularly, basic temporary data facing to a connection service of SCCP is protected so that the MSC can not break the call processing of a user in the conversation or ringing state. Message loss rate is effectively reduced, and the present invention can be applied to the MSC of a mobile communication system.
Description
The present invention relates to a kind of method of utilizing call protection to reduce cutting off rate in the mobile communication system.
In mobile switch system, for ensureing the reliability of MSC, generally speaking, the MSC main computer all is furnished with guest machine, forms the working method of active/standby usefulness.Main computer work at ordinary times in case main computer breaks down, is carried out active/standbyly switching with machine immediately, allows guest machine take over main computer work, and is bad if call protection is handled in this process, just may produce call drop.
In general, in stored-program control exchange, guest machine has two kinds of working methods, cold standby and stand-by heats.All power up at ordinary times with machine as the active/standby of control assembly.
From the angle stand-by heat and the cold standby of call treatment data protection, its characteristics are as follows:
Stand-by heat: active/standby at ordinary times with machine holding calling deal with data all, in case when swinging to guest machine because of the main computer fault, the temporary transient data of call treatment are not lost substantially, the user who is in conversation or ringing condition is not originally interrupted.The just just calling in processing procedure of loss.
Cold standby: guest machine holding calling deal with data not at ordinary times, in case because of main computer breaks down when swinging to guest machine, data are all lost.New main computer need reinitialize, and restarts.All ongoing conversations or ring are all interrupted.
According to different processing methods, stand-by heat has the different operating mode, comprising:
(1) synchronous working mode
In this manner, two processors receive information simultaneously, carry out an instruction simultaneously, and compare its execution result.If identical, then change next bar instruction over to, they seem that same processor is in work.But have only issue an order of a processor pair peripheral hardware and dateout.When if this processor breaks down, then by another processor issue an order and dateout.
(2) the arrangement works mode of helping each other
Two or some processors are shared work by traffic at ordinary times, and promptly each processor is born a part of telephone traffic separately, in case there is a processor to break down, then its part work is by other processor burden.
(3) active/standby machine working method
Under this working method, having only main computer to participate in operation handles, guest machine is only switched on, do not move, but main computer will with the temporary transient data of conversation or the subscriber-related call treatment of ringing condition when writing the main computer memory, also pass to guest machine, write the memory of guest machine, make being consistent of interior data of guest machine memory and main computer, thereby data is effective in real time in the assurance guest machine memory.When main computer broke down and swings to guest machine, guest machine just can utilize the data in the own memory to carry out work.
Active/standby with in the machine working method, when switching with machine, for the call treatment of keeping conversation or ringing condition user is not interrupted, the module that requirement is relevant with conversation or the processing of ringing condition customer call all participates in call protection active/standby.If wherein a certain module do not participate in call protection, temporary transient data of this module call protection not just in guest machine so.Therefore,, owing to there is the module do not carry out call protection in the guest machine, cause probably conversing or ringing condition user's call treatment is interrupted, produce call drop even other module has all been carried out call protection.
In traditional stored-program control exchange; when active/standby when switching with machine; participating in module that call protection handles has ISUP, TUP, DUP, Home Exchange Call, Chinese No.1 signaling (call out with the road outbound call, with the road incoming call, with road tandem exchange etc.), and SCCP is not carried out the processing of call protection.
In the MSC of mobile communication system, with reference to the way of traditional stored-program control exchange, SCCP not to be handled accordingly usually, agreement does not have the requirement of this respect yet.Because BSSAP is the agreement on the SCCP basis; active/standby when switching with machine; if SCCP does not carry out the processing of call protection; then in guest machine; the existing connection of SCCP can not be corresponding with the existing connection among the BSSAP; SCCP or BSSAP are with asynchronous, and as the part of abnormality processing, SCCP connects corresponding processing and discharges.In guest machine, these connect corresponding processing is call treatment of shielded conversation or ringing condition, and such processing mode can cause conversation or ring to be interrupted when switching with machine active/standby.Therefore, in mobile switch, also do not realize call protection truly at present to conversation or ringing condition user.
The objective of the invention is to by SCCP being connected and the call protection of BSSAP is handled, the MSC that makes mobile communication system converses when switching with machine or ring is not interrupted active/standby, thereby has reduced cutting off rate effectively.
When mobile communication system MSC active/standby switched with machine; not only to TUP, the ISUP of No.7 signaling; China No.1 signaling is carried out call protection and is handled; but also to the temporary transient data of the basic connection-oriented service of SCCP, BSSAP (corresponding A interface and calling controling CC process) application layer also carried out call protection handle, promptly handle relevant module and all participated in the call protection processing with conversation or ringing condition customer call.Main computer in time will be handled relevant temporary transient data message informing guest machine with conversation or ringing condition customer call, and the data of guest machine and the data of main computer are consistent, and guarantee its real-time effectiveness.
The described method of utilizing call protection to reduce cutting off rate, its treatment step is as follows:
1. each process that participates in call protection is when guest machine powers on and the main computer data sync;
2. enter protected state in certain processing in real time and when (as entering ringing condition) temporary transient data are passed to guest machine from main computer from handshaking procedure;
3. when the protected state of certain processing changes (as entering talking state from ringing condition), temporary transient data are passed to guest machine from main computer in real time;
When the state of certain processing from protected state transition to not protected state, main computer requires the temporary transient data deletion of guest machine with alignment processing.
5. active/standby when switching with machine, each process of participation protective is checked shielded processing in the guest machine, and each process will be checked inconsistent processing and discharge; The process that participates in call protection in the former main computer discharges and is in the not processing of protected state.
After adopting above-mentioned call protection method, take place active/standbyly when switching with machine at MSC, the temporary transient data that are in ring or talking state user are effectively protected, therefore, MSC does not interrupt the processing of these customer calls, has reduced cutting off rate effectively.
Below in conjunction with accompanying drawing the embodiment of described call protection method in mobile communication system MSC is further described:
The flow chart of Fig. 1 call protection when to be that MSC is active/standby switch with machine
Fig. 2 is A interface signaling Protocol REference Model figure.
Fig. 3 is the flow chart of SCCP main computer when handling active/standby machine and switching.
Fig. 4 is the flow chart of SCCP guest machine when handling active/standby machine and switching.
Fig. 5-the 1st, when the guest machine of MSC powers on from the flow chart of main computer receipt of call protected data.
Fig. 5-the 2nd, the guest machine of MSC and the protected data of main computer keep synchronous flow chart.
Fig. 5-the 3rd, the active/standby machine of MSC utilize protected data to handle the flow chart of calling out when switching.
In mobile communication system, the A interface among Fig. 2 is the interface between BSC (base station controller) and the MSC.The support of A interface provides all business to mobile communication system user, allows in PLMN (Public Land Mobile Network) distributing radio resource simultaneously and to the operation and maintenance of these resources.The signaling protocol reference model of A interface as shown in Figure 2.MTP (Message Transfer Part) provides reliable transmission for signaling message, and SCCP (SCCP) provides the refer-mechanisms of certain processing of identification (for example certain specific call).The SCCP that uses between MSC and BSS (base station sub-system) is the subclass of full SCCP.BSSAP (Base Station Subsystem Application Part, corresponding A interface and CC process) is as based on the application layer of No.7 signaling system MTP and SCCP, mainly based on the wave point rules, and the identification of handling when also comprising the control program of Radio Resource and using SCCP.So what participate in call treatment on the A interface has MTP, SCCP, a BSSAP several sections.
SCCP uses not have substantially on the A interface and connects and basic towards being connected two class business, wherein the basic connection-oriented service (except the paging) of call treatment use.
In the MSC of mobile communication system; MSC is in order to guarantee to converse or the user of ringing condition call drop not when the Active/Standby Changeover; when TUP, the ISUP of No.7 signaling and Chinese No.1 signaling are carried out call protection, increased again SCCP process, BSSAP (calling controling CC process, A interface process) have been carried out call protection.Reason is as follows: in talking state, what participate in call treatment has a SCCP process, the calling controling CC process, and A mouth process, the TUP of No.7 signaling, ISUP and channel associated signalling need be carried out call protection to these several processes.Ringing condition divided by on outside the process; also having some supplementary service (as: Call Forwarding No Reply, user determination user busy forward shifting etc.) to need VLR (VLR Visitor Location Register) participates in handling; MSC sets up dialogue relation by MAP (MAP) and VLR and comes Coordination Treatment; what VLR and MSC adopted is internal interface; if behind ringing condition, there is supplementary service to take place; by setting up new dialogue between the MAP of MSC and the VLR, so the MAP process of VLR and MSC needn't be carried out call protection.
In the MSC of mobile communication system, as shown in Figure 3 and Figure 4, corresponding each processing, the SCCP process is corresponding with the A interface process by connection identifier, and the A interface process is corresponding with calling control process CC by handling index Index.To the processing of call protection the time; should guarantee when data stabilization; corresponding relation in A interface process, CC process and SCCP process is corresponding one by one; the several processes that promptly participate in the call protection processing all exist; avoid the processing of some or several processes to discharge, and the situation that the processing of other process exists.
When guest machine powers on, carry out the active/standby machine data Synchronous Processing of using earlier.Each process that participates in call protection sends to main computer asks for protection data-message; send protected data message to guest machine after each process of main computer participation call protection is received this message, the corresponding process of guest machine writes the corresponding data district with data after receiving this message.
Protection mechanism with regard to each process illustrates one by one below:
The call protection treatment step of one SCCP:
The first step: as Fig. 3, main connection request or the CONNect Acknowledgement message of receiving the A interface process with the SCCP process of state, with after application layer A interface is set up SCCP and is connected, between main computer SCCP process and guest machine SCCP process, set up communication, these temporary transient data that connect alignment processing are passed to guest machine by message.As Fig. 4, guest machine is with these writing data into memory.
Second step: as Fig. 3, SCCP receives the SCCP disconnection message of application layer, and main computer is by the message informing guest machine, and as Fig. 4, guest machine connects corresponding processing with this and discharges.
The 3rd step:, after main computer SCCP receives switching messages, state is changed to stand-by state as Fig. 3; As Fig. 4, after guest machine SCCP receives masterslave switchover message, state is changed to the main state of using.At this moment, the temporary transient data of all basic connection-oriented services all exist in new main computer (former guest machine), and the existing processing that connects correspondence may be a call treatment (except that paging) among the new main computer SCCP any stage or position renewal wait other business.Even for call treatment, the SCCP of new main computer is as the bottom of application layer BSSAP and do not know that existing connect corresponding user and whether be in conversation or ringing condition this moment.Have SCCP to connect, but the user who is not in conversation or ringing condition does not do call protection.
In order to distinguish the call protection state; between SCCP and its upper layer application BSSAP, increase message (BSSAP can confirm whether the user converses or ringing condition); be used for SCCP and carry out the checking that SCCP is connected with BSSAP two interlayers, this message comprises the existing connection identifier that connects.As Fig. 3, after SCCP receives checking message from BSSAP, compare having the connection identifier that is connected in the existing connection identifier that connects in this message and this process.As identical, show that this connects corresponding upper BSSAP processing and has also done call protection, SCCP keeps this and connects corresponding processing; So connection identifier BSSAP takies, and SCCP is vacant, and SCCP sends release message to BSSAP, discharges this connection; BSSAP is vacant if any connection identifier, and SCCP takies, and SCCP discharges the processing of relevant this connection.
The 4th step: the connection that main computer SCCP causes when abnormality processing discharges, and by sending message informing guest machine SCCP, after guest machine SCCP receives this message, discharges the processing of corresponding this connection.
Two A interface process call protection treatment steps:
The first step: as Fig. 5-1; when certain call treatment of calling outgoing enters ringing condition or talking state; require call protection message by main computer calling controling CC process to the transmission of main computer A interface process, notice main computer A interface process is carried out call protection to this processing.After main computer A interface process is received this message, set up communication active/standby with the A interface process between the machine, main computer sends message to guest machine, and this message is carried the relevant temporary transient data of this call treatment, after guest machine is received this message, in writing data into memory.
Second step: as Fig. 5-2, when certain call treatment of main computer A interface process causes end of conversation owing to user's on-hook or other reason, main computer A interface process sends message to guest machine A interface process, after guest machine A interface process is received this message, corresponding processing is discharged.
The 3rd step: as Fig. 5-3, main computer A interface process is after receiving switching messages, and the processing that need not protect discharges, and state is changed to the guest machine state.After guest machine is received switching messages, corresponding state is changed to the main computer state, this moment, guest machine became new main computer.New main computer A interface process is sent connection identifier checking message to SCCP, carries the existing connection identifier that connects in the message.The A interface process is checked the A interface process processing index Index corresponding with the calling controling CC process according to the public processing index Index table of A interface process and CC process in the new main computer.If the processing index Index of A interface process takies, the processing index Index of calling controling CC process correspondence takies, and then handles and continues; If the processing index Index of A interface process takies, the processing index Index of calling controling CC process correspondence is vacant, then discharges this process and handles, and removes SCCP and connects, and avoids resource from suspending.
The 4th step: if the decision of A interface process is not protected some calling, main computer sends a notification message to guest machine, after guest machine is received this message, will handle release accordingly.
The call protection treatment step of three calling controling CC processes:
The first step:, when main computer calling controling CC process judges that according to state certain call treatment of calling outgoing enters ringing condition or talking state, ask call protection message to the transmission of main computer A interface process as Fig. 5-1.Active/standbyly set up communication, the temporary transient data of this call treatment are passed to guest machine in the mode of message from main computer, after guest machine is received this message, writing data into memory with machine calling controling CC process.
Second step: as Fig. 5-2, main computer calling controling CC process in certain call treatment because user's on-hook or other abnormal cause when causing end of conversation, main computer calling controling CC process sends a notification message to guest machine, after guest machine is received this message, discharges corresponding processing.
The 3rd step: as Fig. 5-3, main computer calling controling CC process discharges not shielded processing after receiving switching messages, state is changed to guest machine.After guest machine calling controling CC process is received switching messages, state is changed to the main computer state.The call treatment that is in talking state is normally carried out.The CC process is checked the A interface process processing index Index corresponding with the calling controling CC process according to the public processing index Index table of A interface process and CC process in the new main computer.If the processing index Index of A interface process takies, the processing index Index of calling controling CC process correspondence takies, and then handles and continues; If the calling controling CC process handle index Index and take, the processing index Index of A interface process correspondence is vacant, then discharges this process and handles, and discharges the interlock circuit resource, sends release message to associated process, avoids resource from suspending.
The 4th step: if the decision of main computer calling controling CC process is not protected some calling; go to protect message to associated process TUP, channel associated signalling transmission; main computer calling controling CC process sends a notification message to guest machine, after guest machine is received this message, will handle release accordingly.
The TUP process of four No.7 signalings, channel associated signalling call protection treatment step:
The first step: as Fig. 5-1, when main computer TUP process, channel associated signalling judge that according to this process status certain call treatment of calling outgoing enters ringing condition or talking state, active/standbyly set up communication with machine TUP process, channel associated signalling, the temporary transient data of this call treatment are passed to guest machine in the mode of message from main computer, after guest machine is received this message, with writing data into memory.
Second step: as Fig. 5-2, main computer TUP process, channel associated signalling in certain call treatment because user's on-hook or other abnormal cause when causing end of conversation, main computer TUP process, channel associated signalling send a notification message to guest machine, after guest machine is received this message, discharge corresponding processing.
The 3rd step: as Fig. 5-3, main computer TUP process, channel associated signalling discharge not shielded processing after receiving switching messages, state is changed to guest machine.After guest machine TUP process, channel associated signalling are received switching messages, state is changed to the main computer state.The call treatment that is in talking state is normally carried out.Attached: english abbreviation note: BSC: base station controller BSS: base station sub-system BSSAP: Base Station Subsystem Application Part DUP: DUP GSM: global mobile switch system ISUP: integrated service User Part MSC: the MTP of mobile switching centre: Message Transfer Part PLMN: Public Land Mobile Network SCCP: SCCP TUP: Telephone User Part VLR: VLR Visitor Location Register MAP: MAP
Claims (5)
1 one kinds of methods of utilizing call protection to reduce cutting off rate, comprise: when MSC active/standby switched with machine, TUP, ISUP to the No.7 signaling, China No.1 signaling is carried out call protection and is handled, it is characterized in that: also comprise to the call protection of the temporary transient data of the basic connection-oriented service of SCCP handle, the call protection of A interface process and calling controling CC process handles, the data of guest machine and the data of main computer are consistent, guarantee its real-time effectiveness;
The step that described call protection is handled is as follows:
(1) each process that participates in call protection is when guest machine powers on and main computer data data sync;
(2) when certain processing enters protected state, temporary transient data are passed to guest machine from main computer in real time;
(3) when the protected state of certain processing changes, temporary transient data are passed to guest machine from main computer in real time;
(4) when the state of certain processing from protected state transition to not protected state, main computer requires the temporary transient data deletion of guest machine with alignment processing;
When (5) active/standby machine was switched, each process of participation protective was checked shielded processing in the guest machine, and each process will be checked inconsistent processing and discharge; The process that participates in call protection in the former main computer discharges and is in the not processing of protected state.
2 utilize call protection to reduce the method for cutting off rate according to claim 1; it is characterized in that: between SCCP and its upper layer application BSSAP, increase message; this message comprises the existing connection identifier that connects, and is used for active/standby machine and switches back SCCP and carry out the checking that SCCP is connected with BSSAP two interlayers.
3 utilize call protection to reduce the method for cutting off rate according to claim 1, it is characterized in that:
The call protection treatment step of the temporary transient data of the basic connection-oriented service of described SCCP is as follows:
The first step: main connection request or the CONNect Acknowledgement message of receiving A mouth process with the SCCP process of state, with after application layer A mouth is set up SCCP and is connected, between main computer SCCP process and guest machine SCCP process, set up communication, these temporary transient data that connect alignment processing are passed to guest machine by message, and guest machine is with these writing data into memory;
Second step: SCCP receives the SCCP disconnection message of application layer, and main computer is by the message informing guest machine, and guest machine connects corresponding processing with this and discharges;
The 3rd step: after main computer SCCP receives switching messages, state is changed to stand-by state; After guest machine SCCP receives masterslave switchover message, state is changed to the main state of using; Be in the user of ring or talking state, use the message that between SCCP and its upper layer application BSSAP, increases, verify that SCCP is connected with the SCCP of BSSAP two interlayers;
The 4th step: the connection that main computer SCCP causes when abnormality processing discharges, and by sending message informing guest machine SCCP, after guest machine SCCP receives this message, discharges the processing of corresponding this connection.
4 utilize call protection to reduce the method for cutting off rate according to claim 1, it is characterized in that:
The treatment step of described A mouth process is as follows:
The first step: when certain call treatment of calling outgoing enters conversation, require call protection message by main computer calling controling CC process to the transmission of main computer A mouth process, notice is carried out call protection without machine A mouth process to this processing, after main computer A mouth process is received this message, A mouth process between active/standby machine is set up communication, main computer sends message to guest machine, after guest machine is received this message, in writing data into memory;
Second step: because user's on-hook or other reasons when causing end of conversation, main computer A mouth process sends message to guest machine A mouth process, after guest machine A mouth process is received this message, corresponding processing is discharged when certain call treatment of main computer A mouth process;
The 3rd the step: main computer A mouth process is changed to the guest machine state with state after receiving switching messages, standby receive switching messages after, become new main computer; New main computer A mouth process is sent connection identifier checking message to SCCP, carry the existing connection identifier that connects in the message, new main computer A mouth process is checked the A mouth process processing index Index corresponding with the calling controling CC process according to the public processing index Index table of A mouth process and CC process;
The 4th step: if the decision of A mouth process is not protected some calling, main computer sends a notification message to guest machine, after guest machine is received this message, will handle release accordingly.
5 utilize call protection to reduce the method for cutting off rate according to claim 1, it is characterized in that:
The treatment step of calling controling CC process is as follows:
The first step: when main computer calling controling CC process judges that according to state certain call treatment of calling outgoing enters conversation, ask call protection message to the transmission of main computer A mouth process, active/standby machine calling controling CC process is set up communication, the temporary transient data of this call treatment are passed to guest machine in the mode of message from main computer, after guest machine is received this message, with writing data into memory;
Second step: when main computer calling controling CC process caused end of conversation in certain call treatment owing to user's on-hook or the normal reason of other Yi, a legendary monarch of Youqiong State in the xia Dynastys, main computer calling controling CC process sent a notification message to guest machine, after guest machine is received this message, discharged corresponding processing;
The 3rd step: main computer calling controling CC process discharges not protected and processing after receiving switching messages, and state is changed to guest machine, after guest machine calling controling CC process is received switching messages, state is changed to the main computer state; The CC process is checked the A mouth process processing index Index table corresponding with the calling controling CC process according to the public processing index Index table of A mouth process and CC process in the new main computer;
The 4th step: if the decision of main computer calling controling CC process is not protected some calling; go to protect message to associated process TUP, channel associated signalling transmission; main computer calling controling CC process sends a notification message with machine to blood, after calling controling CC process guest machine is received this message, respective handling is discharged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99120200 CN1112814C (en) | 1999-09-18 | 1999-09-18 | Method for reducting message loss rate by call protection |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 99120200 CN1112814C (en) | 1999-09-18 | 1999-09-18 | Method for reducting message loss rate by call protection |
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| CN1283049A CN1283049A (en) | 2001-02-07 |
| CN1112814C true CN1112814C (en) | 2003-06-25 |
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| CN 99120200 Expired - Fee Related CN1112814C (en) | 1999-09-18 | 1999-09-18 | Method for reducting message loss rate by call protection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012167620A1 (en) * | 2011-06-08 | 2012-12-13 | 中兴通讯股份有限公司 | Method and system for reducing calling failure of color ring back tone service |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1219360C (en) * | 2002-01-24 | 2005-09-14 | 华为技术有限公司 | Backup method for mobile exchange center |
| CN102573110B (en) * | 2008-08-14 | 2014-11-05 | 华为技术有限公司 | Call release method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2012167620A1 (en) * | 2011-06-08 | 2012-12-13 | 中兴通讯股份有限公司 | Method and system for reducing calling failure of color ring back tone service |
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