CN100479591C

CN100479591C - Double attaching system of CDMA and its service returning method

Info

Publication number: CN100479591C
Application number: CNB2006101066586A
Authority: CN
Inventors: 李云飞
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2006-07-21
Filing date: 2006-07-21
Publication date: 2009-04-15
Anticipated expiration: 2026-07-21
Also published as: CN1901749A

Abstract

This invention discloses a CDMA dual-home system and its turning-back method, in which, after the primary MSCe resumes work, the call set up by the backup MSCe remains normal, after the backup MSCe tests that the primary MSCe resumes normal, it switches the call belonging to the primary MSCe by a forward switch flow to update or rebuild the call circuit laod and signaling connection and instructs that this time of switch is the analog one after the turning back by switching specific label in related information and carries with the circuit ID before the BSC in the switch information to let related device reuse the set up load and empty channel resources.

Description

Double attaching system of CDMA and service returning method thereof

Technical field

The present invention relates to moving communicating field, particularly code division multiple access (Code Division MultipleAccess is called for short " CDMA ") system.

Background technology

Fast development along with the user's request and the communication technology, mobile communication is (The Second Generation from analogue technique to second generation mobile communication, be called for short " 2G "), and constantly developing to the direction of 3G (Third Generation) Moblie (The Third Generation is called for short " 3G ").In evolution, introduced soft-exchange construction, according to controlling the soft switch thought of separating with carrying, (the Mobile Switching Center of the mobile switching centre among the CDMA mobile network, abbreviation " MSC ") network element is split as mobile soft switch center (Mobile Switching Center emulation, be called for short " MSCe ") and two CN network elements of media gateway (Media Gateway is called for short " MGW ").

For A mouth message, the function of the built-in SGW SG of MGW, its protocol stack is as shown in Figure 1.

After adopting soft-exchange construction,, introduced dual-homed in order to improve the disaster tolerance ability of system.A MGW can meet two MSCe, and is subordinated to this two MSCe.And these two MSCe can be with active/standby mode work, and under the normal operation, a MGW can only be registered on the MSCe, and this MSCe is the main MSCe of MGW; When this MSCe broke down, this MGW would subscribe on another MSCe, and changed the resource that continues as this MGW management by this MSCe service is provided, and the MSCe that takes over main MSCe work is for being equipped with MSCe.This also is so-called dual-homed.

Under normal circumstances, MGW1 belongs to MSCe1, and MGW2 belongs to MSCe2.Dispose dual-homed after, as shown in Figure 2, MSCe1 is the main MSCe of MGW1, the MSCe that is equipped with of MGW1 is MSCe2, MSCe2 is the main MSCe of MGW2, MGW2 to be equipped with MSCe be MSCe1.Be MSCe1 except that the resource of configuration MGW1 yet, also dispose the resource of MGW2, MSCe1 does not use the resource of MGW2 under the normal condition; MSCe2 also disposes the resource of MGW1 except that the resource of configuration MGW2, MSCe2 does not use the resource of MGW1 under the normal condition.When operate as normal, MGW1 is registered on the MSCe1, and MGW2 is registered on the MSCe2, and the signaling that BSC1 transmits through MGW1 sends on the MSCe1 of its registration, and the signaling that BSC2 transmits through MGW2 sends on the MSCe2 of its registration.

When one of them MSCe lost efficacy for a certain reason, be MSCe1 for example, the MGW1 under it will be registered to and be equipped with on the MSCe2; Be equipped with MSCe2 and detect the heartbeat interruption, activate related resource, the work of taking over main MSCe1.After MSCe1 recovered normally, the MGW1 under it re-registered on the main MSCe1, was equipped with MSCe2 and detected heartbeating recovery, finished to take over the work of main MSCe1.

Normal SCCP (Signaling Connection Control Part is called for short " SCCP ") connects and sets up process as shown in Figure 3.

In step 301, SCCP A (A end) receives the service request of upper-layer service, distributes the connection reference of oneself, and the link information of record upper-layer service is initiated to connect the request of foundation to opposite end SCCP B (B end), and the connection reference of carrying SCCP A.

In step 302, SCCP B distributes the connection reference of oneself, writes down the connection reference of SCCP A end, and data are sent to upper-layer service.After receiving the affirmation message of upper-layer service, the link information of record upper-layer service.Then, send to connect and confirm to SCCP A, the connection reference of carrying SCCP B end is connected reference with SCCP A end.

Both sides connect to set up and finish after knowing that local terminal connection reference is connected reference with the opposite end.

In step 303, when follow-up upper-layer service will send data, send out message and give SCCP, for example be the A end, promptly upper-layer service sends to SCCP A with message, and carries the link information of SCCP, by SCCPA this message is sent to the opposite end, the connection reference of band opposite end SCCP B.

In step 304, opposite end SCCP B receives after the message according to the connection in the message and with reference to the data record that finds local terminal data to be sent to the upper-layer service module.

Call reversed process being equipped with the process that MSCe takes over main MSCe.Main MSCe is recovered normal, take over professional process again and be called the process of refunding.

In actual applications, there is following problem in dual-homed scheme: after main MSCe resumes work, can't normally be kept by the calling that is equipped with MSCe foundation.

Cause the main cause of this situation to be, when main MSCe lost efficacy, for example the main MSCe1 of MGW1 as shown in Figure 2 lost efficacy, and MGW1 is registered to MSCe2 fully, and the signaling that BSC1 transmits through MGW1 sends to fully on the MSCe2.After main MSCe1 recovers normally, take over the calling signaling that main MSCe1 duration of work sets up and be forwarded on the main MSCe1 being equipped with MSCe2 through MGW1, but be not equipped with call information that MSCe2 set up on the main MSCe1 this moment, owing to can not find corresponding connection reference, therefore, relevant signaling process can't go on, and carries out abnormal call clearing, and this calling also can't normally be kept.

In addition, introduce normal forward direction switching flow, as shown in Figure 4, wherein, end points concerns as shown in Figure 5.

In step 401, BSC1 initiates handover request to MSCe1, promptly sends " HANDOFFREQUIRED " message.

In step 402, MSCe1 adds end points 7 in MGW1.

In step 403, after end points 7 was added successfully, MGW1 returned response message to MSCe1.

In step 404, MSCe1 sends " FACDIR2 " message to MSCe2.

In step 405, MSCe2 adds end points 8,9 according to " FACDIR2 " message of receiving in MGW2.

In step 406, after end points 8,9 was added successfully, MGW2 returned response message to MSCe2.

In step 407, MSCe2 sends " HANDOFF REQUEST " to BSC2, wherein, comprises the connection reference of MSCe2 side.

In step 408, after BSC2 receives " HANDOFF REQUEST " message, distribute local terminal to connect reference, and the connection reference of record MSCe side.In the switching request acknowledgement message of returning (also being " HANDOFF REQUEST ACK " message), carry the connection reference of BSC2 side and the reference that is connected of MSCe2 side.After MSCe receives, connect reference according to the MSCe side in the message and find the local terminal link information, and record BSC side connects reference.

In step 409, MSCe2 returns the response message of " FACDIR2 ", i.e. " facdir2 " message to MSCe1.

In step 410, after MSCe1 receives " facdir2 " message, send switching command, i.e. " HANDOFF COMMAND " message to BSC1.

In step 411, beginning (HANDOFF COMMENCED) is switched in the BSC1 indication.Wherein, annexation is as shown in Figure 5 between end points.

In step 412, when finishing switching, (HANDOFFCOMPLETE) finished in BSC2 notice MSCe2 switching.

In step 413, MSCe2 sends " MSONCH " message to MSCe1.

In step 414, the end points 5 that MSCe1 indication MGW1 deletion is set up.

In step 415, behind the MGW1 deletion end points 5, return response message to MSCe1.

In step 416, MSCe1 sends clear command (CLEAR COMMAND) to BSC1.

In step 417, BSC1 removes and finishes, and returns response message.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of double attaching system of CDMA and service returning method thereof, makes after main MSCe resumes work, and still can normally be kept by the calling that is equipped with MSCe foundation.

For achieving the above object, the invention provides a kind of double attaching system of CDMA service returning method, comprise following steps:

Be equipped with MSCe detect main MSCe recover normal after, the forward direction switching flow is initiated in the calling that belongs to this main MSCe, these callings are switched to this main MSCe, upgrade or rebuild that these calling signaling connect and circuit carries by this main MSCe;

Described these callings are switched to this main MSCe, upgrade or rebuild that these calling signaling connect and circuit carries and comprises following substep by this main MSCe:

The described MSCe of being equipped with is by sending the related news that forward direction switches to main MSCe, this switches to the sign that the simulation after refunding is switched to carry expression in this message, indicate described main MSCe to notify subordinate's media gateway MGW to set up two end points, respectively corresponding and described circuit between the MSCe fully and and this main MSCe under base station controller BSC between circuit, and send the related news that switch to this BSC, this switches to the sign that the simulation after refunding is switched wherein to carry expression, and circuit identifier, described circuit identifier be new circuit identifier or refund before circuit identifier among the BSC under this main MSCe;

Described BSC upgrades or connection of reconstruction calling signaling and circuit carrying according to the related news of the switching of receiving.

In this external described method, the related news that the forward direction that the described MSCe of being equipped with sends to main MSCe switches are equipment indication " FACDIR2 " message, and the related news that described main MSCe sends to the switching of BSC are handoff request " HANDOFF REQUEST " message.

In this external described method, described be equipped with carry in " FACDIR2 " message that MSCe sends to described main MSCe refund before circuit identifier among the BSC.

In this external described method, carry the circuit identifier of refunding among the preceding BSC by in described " FACDIR2 ", increasing parameter.

In this external described method, after described BSC receives and carries described expression this switches to " HANDOFF REQUEST " message of the sign that the simulation after refunding switches, find original calling according to the user ID in this message, and upgrade this calling signaling connection control section link information.

In this external described method, after described BSC receives and carries described expression this switches to " HANDOFF REQUEST " message of the sign that the simulation after refunding switches, check the circuit identifier in this message, the ifs circuit sign is consistent with the circuit identifier of former calling, then continue to use the A mouthpiece between original mobile switching centre and the BSC to carry, otherwise rebuild the carrying of A mouth circuit.

In this external described method, after described BSC receives and carries described expression this switches to " HANDOFF REQUEST " message of the sign that the simulation after refunding switches, continue to use the BSC of former calling and the carrying between the base station, and continue to use the channel of eating dishes without rice or wine of former calling.

The present invention also provides a kind of double attaching system of CDMA, comprises the BSC under active and standby MSCe and the main MSCe;

Described MSCe fully is used to detect the state of described main MSCe, if main MSCe reverts to normal state from fault case, then sends the related news that forward direction switches to main MSCe, and this switches to the sign that the simulation after refunding is switched to carry expression in this message;

Described main MSCe is used for after receiving the related news that switch from the described described forward direction that is equipped with MSCe, notify this main MSCe subordinate's media gateway MGW to set up two end points, respectively corresponding and described circuit between the MSCe fully and and this main MSCe under base station controller BSC between circuit, and send the related news that switch to this BSC, this switches to the sign that the simulation after refunding is switched wherein to carry expression, and circuit identifier, described circuit identifier be new circuit identifier or refund before circuit identifier among the BSC under this main MSCe;

Described BSC is used for upgrading or connection of reconstruction calling signaling and circuit carrying according to the related news of the switching of receiving.

By relatively finding, the main distinction of technical scheme of the present invention and prior art is, after MSCe detected main MSCe recovery normally fully, the calling that will belong to main MSCe switched to main MSCe by the forward direction switching flow, and the circuit of renewal or reconstruction calling carries and is connected with signaling.Thereby avoided taking over calling that main MSCe duration of work sets up and recovering normal back at main MSCe and removed unusually being equipped with MSCe, guaranteed the continuity of customer service, promoted user's professional experience.

Indicate this simulation that switches to after refunding to switch by sign specific in the handover-related message, and in switching message, carry the circuit identifier of refunding among the preceding BSC.Thereby make relevant device reuse resources such as the carrying of having set up and the channel of eating dishes without rice or wine to greatest extent, reduce the mutual of unnecessary message such as " HANDOFFCOMPLETE ", the processing burden of mitigation system.

Description of drawings

Fig. 1 is an A mouth protocol stack schematic diagram in the prior art;

Fig. 2 is the dual-homed structure chart of cdma system in the prior art;

Fig. 3 is that normal SCCP connects the method for building up flow chart in the prior art;

Fig. 4 is the normal changing method flow chart of system in the prior art;

Fig. 5 is that CDMA double attaching system end points concerns schematic diagram in the prior art;

Fig. 6 is the CDMA double attaching system service returning method flow chart according to first embodiment of the invention;

Fig. 7 is that the CDMA double attaching system end points according to first embodiment of the invention concerns schematic diagram;

Fig. 8 is the CDMA double attaching system service returning method flow chart according to second embodiment of the invention;

Fig. 9 is that the CDMA double attaching system end points according to second embodiment of the invention concerns schematic diagram.

Embodiment

For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.

The CDMA double attaching system service returning method of first embodiment of the invention as shown in Figure 6.Wherein, MSCe1 is the MSCe that is equipped with of main MSCe2, and MGW1 belongs to MSCe1 fully, and MGW2 belongs to main MSCe2, and BSC1 is the BSC under the MSC1, and BSC2 is the BSC under the MSC2.Main for a certain reason MSCe2 inefficacy, the MGW2 under it initiates registration to being equipped with MSCe1, is equipped with MSCe1 and detects the heartbeat interruption, takes over the access device under the main MSCe2.The calling that BSC2 initiates, signaling is through being equipped with on the MSCe1 that MGW2 transmits.

After dual-homed service is refunded, after also promptly main MSCe2 recovers normally, be equipped with MSCe1 and detect main MSCe2 heartbeating recovery, check the office call that belongs to main MSCe2, initiate the forward direction switching flow by being equipped with MSCe to main MSCe.The end points relation as shown in Figure 7.After MSCe1 detected main MSCe2 recovery normally fully, the calling that will belong to main MSCe2 switched to main MSCe2 by the forward direction switching flow, and the circuit of renewal or reconstruction calling carries and is connected with signaling.Thereby avoided taking over calling that main MSCe2 duration of work sets up and recovering normal back at main MSCe2 and removed unusually being equipped with MSCe1, guaranteed the continuity of customer service, promoted user's professional experience.

In step 601, office call therein in MSCe2 paralysis period, takies two end points 3,4 on the MGW2, respectively the circuit of corresponding calling and called.MSCe1 again to MGW1 send to add request message, set up two end points 5,6, corresponding respectively two circuit to MSCe2.

In step 602, MGW1 builds up the carrying back and returns response to MSCe1.

And MSCe1 initiates the switching flow of calling and called respectively.Wherein, calling and called switch and carry out simultaneously, and are for convenience, described separately them.

In step 603, MSCe1 structure forward direction switches message " FACDIR2 ", wherein carry user ID, for example, international mobile station identity number (International Mobile Station Identity, be called for short " IMSI ") or mobile identification number (Mobile Identification Number is called for short " MIN ").The corresponding end points 6 of circuit identifier information wherein increases sign and shows it is that the analogue forward of initiating after dual-homed service is refunded is switched in message.Build the A mouth circuit identifier that carries usefulness but expansion bands is original in message with BSC.

In step 604, after MSCe2 receives " FACDIR2 " message, send to add request to MGW2, set up two

end points

7,8, the circuit between end points 7 correspondences and MSCe1 wherein, the circuit between end points 8 correspondences and BSC2.If have in the FACDIR2 message and original build the A mouth circuit identifier of carrying usefulness with BSC, the circuit between the promptly originally corresponding and BSC of end points 8 then.

In step 605, MGW2 builds up the carrying back and returns response to MSCe2.

In step 606, MSCe2 sends " HANDOFF REQUEST " message to BSC2, the corresponding end points 8 of circuit identifier wherein, and carry user ID, and as IMSI, and the sign that switches of the simulation of dual-homed service after refunding.In message, comprise the connection reference of MSCe2 side.

In step 607, BSC2 distributes local terminal to connect reference according to " HANDOFF REQUEST " message of receiving, and the connection reference of record MSCe side.The sign that simulation after discovery has dual-homed service to refund is switched, then find original call information according to user ID IMSI, connecting reference with new local terminal is connected with the opposite end with reference to upgrading original SCCP link information, replace original A mouth circuit with circuit entrained in " HANDOFFREQUEST " message, again build the carrying of A mouth circuit, carrying between BSC and BTS need not be rebuild, and the channel of eating dishes without rice or wine also adopts the good channel of eating dishes without rice or wine of original foundation.After A mouth circuit was rebuild and finished, BSC2 returned " HANDOFF REQUEST ACK " message to MSCe2.If HANDOFF REQUEST " in the message with A mouth circuit identifier consistent with original A mouth circuit identifier, then still use original A mouth circuit carrying, need not rebuild the carrying of A mouth circuit.

In step 608, the connection reference of MSCe2 record BSC side, the A message connection rebulids.MSCe2 returns the response message " facdir2 " of " FACDIR2 " to MSCe1.Indicate this simulation that switches to after refunding to switch by sign specific in the handover-related message, and in switching message, carry the circuit identifier of refunding among the preceding BSC.Thereby make relevant device reuse resources such as the carrying of having set up and the channel of eating dishes without rice or wine to greatest extent, therefore, BSC need not send " HANDOFFCOMPLETE " message to MSC.Reduce the mutual of unnecessary message such as " HANDOFF COMPLETE ", the processing burden of mitigation system.

Step 609 is similar to step 608 with step 603 respectively to step 614, for the opposite side user rebuilds, repeats no more herein.

Switch finish after, follow-up call signaling can lead to main MSCe2 passes fully that MSCe1 proceeds to handle back.

The CDMA double attaching system service returning method of second embodiment of the invention as shown in Figure 8.Similar with above-mentioned execution mode, main MSCe2 lost efficacy, and was equipped with the work that MSCe1 takes over main MSCe2.Be equipped with the calling that MSCe1 takes over main MSCe2 duration of work foundation: caller is at BSC1, called at BSC2.When main MSCe2 recovers just often, be equipped with MSCe1 and check the calling of setting up, the discovery callee side should be taken over by main MSCe2, initiates the forward direction switching flow.Wherein, the end points relation as shown in Figure 9.

In step 801, MSCe1 structure forward direction switches message " FACDIR2 ", and carry user ID, for example, IMSI or MIN, the corresponding end points 3 of circuit identifier information wherein (promptly still with the carrying of refunding preceding foundation) increases sign and shows it is the analogue forward switching that dual-homed service is refunded the back initiation in message.If the carrying between MGW and called BSC then increases the circuit identifier of parameter identification target side BSC also with the carrying of setting up before refunding in message.

In step 802, after MSCe2 receives " FACDIR2 " message, send to add request to MGW2, set up two end points 4,5, the circuit between end points 4 correspondences and MSCe1 wherein, the circuit between end points 5 correspondences and BSC2.

Though carry the still original end points of usefulness, do not have corresponding beared information among the MSCe2, so MSCe2 still needs to send the message of building end points to MGW2, after receiving, builds MGW2 beared information again.

In step 803, MGW2 returns response after building up carrying.

In step 804, MSCe2 sends " HANDOFF REQUEST " message to BSC2, and the corresponding end points 5 of circuit identifier wherein carries user ID IMSI, and the sign that switches of the simulation of dual-homed service after refunding.After BSC2 received message, the sign that the simulation after refunding according to dual-homed service is switched rebulid SCCP and connects; Find original call information according to user ID IMSI, upgrade the SCCP link information.If BSC2 finds that the circuit of band in " HANDOFF REQUEST " is the same with original circuit, then only upgrade the SCCP link information, carrying is still with original carrying of setting up.

In step 805, after the signaling link information was upgraded and finished, BSC2 returned " HANDOFF REQUEST ACK " message to MSCe2.The connection reference of MSCe2 record BSC side, the A message connection rebulids.

In step 806, MSCe2 returns " facdir2 " to MSCe1, i.e. " FACDIR2 " response message.Channel need not be rebuild owing to eat dishes without rice or wine, and BSC need not send " HANDOFFCOMPLETE " message to MSC.

In the respective embodiments described above, this switches to the sign that the simulation after refunding is switched to carry expression in the related news that forward direction switches.Wherein, the related news that forward direction switches send " FACDIR2 " message of main MSCe in order to MSCe and " HANDOFF REQUEST " message that main MSCe sends to BSC is that example describes, those of ordinary skills understand easily, adopt other similar message, this switches to the sign that the simulation after refunding is switched to carry expression, does not all depart from spirit of the present invention.

The CDMA double attaching system of third embodiment of the invention wherein, comprises active and standby MSCe.

Specifically, be equipped with the state that MSCe is used to detect main MSCe,, then the forward direction switching flow initiated in the calling that belongs to this main MSCe, these callings are switched to this main MSCe if main MSCe reverts to normal state from fault case; And main MSCe is used for being equipped with the forward direction switching flow that MSC initiates, and upgrades or connection of reconstruction calling signaling and circuit carrying.

Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.

Claims

1. a double attaching system of CDMA service returning method is characterized in that, comprises following steps:

Be equipped with mobile soft switch center MSCe detect main MSCe recover normal after, the forward direction switching flow is initiated in the calling that belongs to this main MSCe, these callings are switched to this main MSCe, upgrade or rebuild that these calling signaling connect and circuit carries by this main MSCe;

The described MSCe of being equipped with is by sending the related news that forward direction switches to main MSCe, this switches to the sign that the simulation after refunding is switched to carry expression in this message, indicate described main MSCe to notify subordinate's media gateway MGW to set up two end points, respectively corresponding and described circuit between the MSCe fully and and this main MSCe under base station controller BSC between circuit, described main MSCe sends the related news that switch to this BSC, this switches to the sign that the simulation after refunding is switched wherein to carry expression, and circuit identifier, described circuit identifier be new circuit identifier or refund before circuit identifier among the BSC under this main MSCe;

2. double attaching system of CDMA service returning method according to claim 1, it is characterized in that, the related news that the forward direction that the described MSCe of being equipped with sends to main MSCe switches are " FACDIR2 " message, and the related news that described main MSCe sends to the switching of BSC are " HANDOFFREQUEST " message.

3. double attaching system of CDMA service returning method according to claim 2 is characterized in that, described be equipped with carry in " FACDIR2 " message that MSCe sends to described main MSCe refund before circuit identifier among the BSC.

4. double attaching system of CDMA service returning method according to claim 3 is characterized in that, carries the circuit identifier of refunding among the preceding BSC by increase parameter in described " FACDIR2 ".

5. double attaching system of CDMA service returning method according to claim 2, it is characterized in that, after described BSC receives and carries described expression this switches to " HANDOFF REQUEST " message of the sign that the simulation after refunding switches, find original calling according to the user ID in this message, and upgrade this calling signaling connection control section link information.

6. double attaching system of CDMA service returning method according to claim 2, it is characterized in that, after described BSC receives and carries described expression this switches to " HANDOFF REQUEST " message of the sign that the simulation after refunding switches, check the circuit identifier in this message, the ifs circuit sign is consistent with the circuit identifier of former calling, then continue to use original A mouthpiece to carry, otherwise rebuild the carrying of A mouth circuit.

7. double attaching system of CDMA service returning method according to claim 2, it is characterized in that, after described BSC receives and carries described expression this switches to " HANDOFF REQUEST " message of the sign that the simulation after refunding switches, continue to use the BSC of former calling and the carrying between the base station, and continue to use the channel of eating dishes without rice or wine of former calling.

8. a double attaching system of CDMA is characterized in that, comprises the BSC under active and standby mobile soft switch center MSCe and the main MSCe;

Described main MSCe is used for after receiving the related news that switch from the described described forward direction that is equipped with MSCe, notify this main MSCe subordinate's media gateway MGW to set up two end points, respectively corresponding and described circuit between the MSCe fully and and this main MSCe under base station controller BSC between circuit, described main MSCe sends the related news that switch to this BSC, this switches to the sign that the simulation after refunding is switched wherein to carry expression, and circuit identifier, described circuit identifier be new circuit identifier or refund before circuit identifier among the BSC under this main MSCe;