CN100461967C - Exception processing method and system in packet switching process - Google Patents
Exception processing method and system in packet switching process Download PDFInfo
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Abstract
The invention discloses an abnormal processing method in a packet switch process. The method includes that in the packet switch process of a movable station (MS), after the process of packet switch request is accomplished and a target service general packet radio service supporting node (SGSN) does not receive a switch response, the target SGSN informs a resource base station system (BSS) to release to be resources distributed by the MS; or the resource base station system BBS automatically releases to be the resources distributed by the MS after sending out a packet switch order to MS and with no response. Besides, the invention also provides an abnormal processing system during a packet switch process, a target SGSN and a resource base station system BSS. The invention can reduce resource waste.
Description
Technical field
The present invention relates to the handoff technique that divides into groups, relate in particular to abnormality eliminating method and system in the packet switch process.
Background technology
In packet domain (PS, Packet Switched), real-time packet services such as conversation class and stream class have strict requirement to service quality (QoS, Quality of Service), and the introducing that grouping is switched can improve the QoS of real-time packet service.The grouping switching can be divided into following a few class according to the network element that relates to: base station system (BSS, Base Station System) switches (Intra BSS), service universal packet wireless business affair (GPRS in, General Packet Radio Service) switches switching (Inter SGSN) between (Intra SGSN) and SGSN in the support node (SGSN, ServiceGPRS Supporting Node).Wherein, switching is meant that the cell-of-origin at preceding place is switched in travelling carriage (MS, Mobile Station) grouping and the Target cell at place, grouping switching back is administered by same BSS in the BSS; Switch in the SGSN and be meant that cell-of-origin and Target cell are administered by same SGSN; Switch between SGSN and be meant that cell-of-origin and Target cell are administered by different SGSN.
Below to switch to the existing grouping switching flow of example explanation in the SGSN, for switching in the SGSN, source SGSN and target SGSN are same SGSN, wherein, source SGSN is the SGSN of control MS grouping switching source BSS at preceding place, and target SGSN is the SGSN of the target BS S at place, control MS grouping switching back.Referring to shown in Figure 1, the change owner of SGSN inscribe will may further comprise the steps:
Step 101: after source BSS determines the initiation packet switching, send grouping to target SGSN and switch requirement (PS Handover Required), carry switch reasons value, cell-of-origin sign and Target Cell Identifier etc. during this grouping switching requires.
Step 102: target SGSN is determined target BS S according to Target Cell Identifier after receiving that requirement is switched in grouping, and sends grouping handoff request (PS Handover Request) to target BS S.
After step 103: target BS S receives the grouping handoff request, according to allocation strategy and current assignable Radio Resource, for MS distributes and the reservation Radio Resource.
Step 104: target BS S sends grouping switching request response (PS HandoverRequest Acknowledge) to target SGSN.
So far, grouping handoff request process is finished, below the implementation of switching for grouping.
Step 105: after target SGSN is received the grouping switching request response, send grouping to source BSS and switch requirement response (PS Handover Required Acknowledge), notification source BSS prepares to switch.
Step 106: source BSS sends grouping switching command (PS Handover Command) to MS after receiving that the grouping switching requires response, notifies MS to divide into groups to switch, and carries target BS S sign in this switching command.
After step 107:MS receives the grouping switching command, carry out switching command and divide into groups to switch, if handover success, then execution in step 108, enter normal flow; Otherwise execution in step 110 enters unusual flow process.
Step 108: target BS S sends grouping handoff completion message (PS HandoverComplete) to target SGSN, and notification target SGSN grouping switching is finished.
Step 109: after target SGSN is received the PS Handover Complete message that target BS S sends, send deletion packet flow context message (Delete BSS PFC) to source BSS, notification source BSS is released in the resource of distributing for this MS in the cell-of-origin, after source BSS receives Delete BSS PFC message, carry out resource and discharge.
If switch between SGSN, after then target SGSN is received the PS HandoverComplete message that target BS S sends, send the forward direction reorientation to source SGSN and finish message (Forward RelocationComplete), after source SGSN receives Forward Relocation Complete message, send DeleteBSS PFC message to source BSS, after source BSS receives Delete BSS PFC message, be released in the resource of distributing for this MS in the cell-of-origin.
Step 110: if handoff failure, MS gets back to the cell-of-origin, and sends packet cell gravity treatment failed message (Packet Cell Change Failure) to source BSS.
Step 111: after source BSS receives Packet Cell Change Failure message, send packet switch cancellation message (PS Handover Cancel), notification target SGSN handoff failure to target SGSN.
Step 112: after target SGSN was received PS Handover Cancel message, notification target BSS was released to the resource that this MS distributes.
If switch between SGSN, after then source BSS receives Packet Cell Change Failure message, send PS Handover Cancel message, notification source SGSN handoff failure to source SGSN; After source SGSN receives PS Handover Cancel message, send reorientation cancellation message (Relocation Cancel Request), notification target SGSN handoff failure to target SGSN; After target SGSN was received Relocation Cancel Request message, notification target BSS was released in the resource of distributing for this MS in the Target cell.
In addition, target SGSN is after receiving the grouping switching request response that target BS S sends, also can start one and be used for monitoring the timer that execution is switched in grouping, that is to say, this timer starts after grouping handoff request process is finished, in some agreements this timer is called timer T14, target SGSN is after receiving the grouping handoff completion message that target BS S sends, with this timer out of service.If take place unusual in the handoff procedure, target SGSN is not also received the grouping handoff completion message from target BS S after the timer expiry of carrying out is switched in the monitoring grouping, so, target SGSN will be released in the resource of distributing for this MS in the Target cell by notification target BSS behind this timer expiry.
If MS can not get back to the cell-of-origin behind handoff failure, can't the informing network handoff failure, that is to say, after grouping handoff request process is finished, when target SGSN can not receive the handoff response of any expression handover success or handoff failure, so, after the timer expiry of carrying out was switched in the monitoring grouping, target SGSN was released to the resource that this MS distributes with notification target BSS, still, the resource that source BSS distributes for this MS in the cell-of-origin but can't obtain discharging, and causes the waste of resource easily.
Summary of the invention
In view of this, the object of the present invention is to provide abnormality eliminating method and system, target SGSN and source BSS in the packet switch process, reduce the wasting of resources.
For achieving the above object, the abnormality eliminating method in first kind of packet switch process provided by the invention is as follows:
In the packet switch process of mobile station MS, after grouping handoff request process was finished, after destination service universal grouping wireless business supporting node SGSN did not receive handoff response, target SGSN notification source base station system BSS was released to the resource that this MS distributes.
Wherein, also comprise after described grouping handoff request process is finished: target SGSN starts timer;
Described target SGSN notification source BSS further comprises before discharging resource: described timer expiry.
Described timer is used to monitor the execution that grouping is switched.
Described grouping switches to when switching in interior switching of BSS or the SGSN,
Described target SGSN notification source BSS discharges resource and comprises: target SGSN sends deletion packet flow context message Delete BSS PFC to source BSS, and source BSS is released to the resource that described MS distributes after receiving Delete BSS PFC message.
Described grouping switches to when switching between SGSN,
Described target SGSN notification source BSS discharges resource and comprises: target SGSN notification source SGSN handoff failure, source SGSN sends Delete BSS PFC message to source BSS after learning handoff failure, and source BSS is released to the resource that described MS distributes after receiving Delete BSS PFC message.
Described handoff response comprises handover success message and switch failure information.
Described handover success message is the grouping handoff completion message PS HandoverComplete from target BS S.
Described switch failure information is from the packet switch cancellation message PS HandoverCancel of source BSS or is the reorientation cancellation message Relocation Cancel Request from source SGSN.
Corresponding first method, the present invention also provides the abnormality processing system in a kind of packet switch process, and this system comprises: target SGSN and source BSS, wherein,
Target SGSN is used for the packet switch process at MS, after grouping handoff request process is finished, do not receive handoff response after, notification source BSS is released to the resource that this MS distributes;
Source BSS is used for being released to the resource that this MS distributes after notified.
Described target SGSN comprises receiver module and notification module, and wherein, receiver module is used for the packet switch process at MS, after grouping handoff request process is finished, do not receive handoff response after, sending to notification module does not have the response indication; Notification module is used for receiving that not having response indication back notification source BSS is released to the resource that this MS distributes.
Described source BSS comprises receiver module and release module, and wherein, the notice from target SGSN that receiver module is used for receiving sends to release module; Release module is used for being released to the resource that this MS distributes after notified.
In addition, the present invention also provides a kind of target SGSN, and this target SGSN comprises receiver module and notification module, wherein, receiver module is used for the packet switch process at MS, after grouping handoff request process is finished, after not receiving handoff response, send nothing response indication to notification module; Notification module is used for receiving that not having response indication back notification source BSS is released to the resource that this MS distributes.
The present invention also provides a provenance BSS, this source BSS comprises receiver module and release module, wherein, the notice from target SGSN that receiver module is used for receiving sends to release module, wherein, in the packet switch process of mobile station MS, after grouping handoff request process was finished, target SGSN was not sent this notice after receiving handoff response; Release module is used for being released to the resource that this MS distributes after receiving this notice.
This shows that in the packet switch process of MS, after grouping handoff request process was finished, after target SGSN was not received handoff response, the target SGSN among the present invention can be released in the resource of distributing for this MS in the cell-of-origin by notification source BSS; Perhaps, source BSS initiatively is not released to the resource that this MS distributes, thereby has reduced the waste of resource receive handoff response after transmission grouping switching command is to MS after.
Description of drawings
Fig. 1 is the grouping switching flow figure that switches in the SGSN in the prior art.
Fig. 2 is the abnormality processing flow chart in the packet switch process in the embodiment of the invention one.
Fig. 3 is the abnormality processing system schematic diagram in the packet switch process of the present invention.
Fig. 4 is the constructed embodiment schematic diagram of abnormality processing system of the present invention.
Fig. 5 is the abnormality processing flow chart in the packet switch process in the embodiment of the invention two.
Fig. 6 is the source BSS structural representation among the present invention.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, the embodiment that develops simultaneously with reference to the accompanying drawings is described in further detail the present invention.
The basic thought of the abnormality eliminating method in first kind of packet switch process provided by the invention is: in the packet switch process of MS, after grouping handoff request process is finished, after target SGSN was not received handoff response, target SGSN notification source BSS was released to the resource that this MS distributes.
Referring to shown in Figure 2, to switch to first kind of abnormality eliminating method of example explanation in the SGSN, in the packet switch process of MS, target SGSN is after grouping handoff request process is finished, after just receiving the grouping switching request response PS Handover Request Acknowledge that target BS S sends, start a timer, such as being the timer that is used for monitoring grouping switching execution; If switching, grouping takes place unusually, cause dividing into groups after the handoff request process finishes, target SGSN is not received any handoff response, so, in order to reduce the waste of resource, behind this timer expiry, target SGSN not only wants notification target BSS to be released in the resource of distributing for this MS in the Target cell, also wants notification source BSS to be released in the resource of distributing for this MS in the cell-of-origin.Target SGSN described here is same SGSN with the source SGSN of control MS grouping switching the preceding place source BSS.
Wherein, described handoff response comprises handover success message and switch failure information, such as, belong to handover success message from the grouping handoff completion message PS Handover Complete of target BS S; All belong to switch failure information from the packet switch cancellation message PS Handover Cancel of source BSS or from the reorientation cancellation message Relocation Cancel Request of source SGSN.
When in grouping switches to BSS, switching, after the timer expiry of carrying out is switched in the monitoring grouping, target SGSN can send deletion packet flow context message Delete BSS PFC to source BSS, notification source BSS is released in the resource of distributing for this MS in the cell-of-origin, after source BSS receives the Delete BSS PFC message that target SGSN sends, be released in the resource of distributing for this MS in the cell-of-origin.Need to prove, switch interior switching of BSS that is meant that SGSN participates in the BSS described here.For switching in the BSS, target SGSN and source SGSN are same SGSN; Target BS S and source BSS are same BSS.
When switching in grouping switches to SGSN, after the timer expiry of carrying out was switched in the monitoring grouping, target SGSN also can send Delete BSS PFC message to source BSS, after source BSS receives Delete BSS PFC message, is released to the resource that this MS distributes.For switching in the SGSN, target SGSN and source SGSN are same SGSN, but target BS S and source BSS are not same BSS.
When grouping switches to when switching between SGSN, target SGSN can notification source SGSN handoff failure, after source SGSN learns handoff failure, sends Delete BSS PFC message to source BSS, after source BSS receives the Delete BSS PFC message that source SGSN sends, be released to the resource that this MS distributes.For switching between SGSN, not only target BS S is different BSS with source BSS, and target SGSN also is different SGSN with source SGSN.
Need to prove that the form of message of target SGSN or source SGSN notification source BSS release resource is not limited to above-mentioned a kind of, also can take other form of message.
Corresponding above-mentioned first method, the present invention also provides the abnormality processing system in a kind of packet switch process, referring to shown in Figure 3, this system comprises: target SGSN and source BSS, wherein, target SGSN is used for the packet switch process at MS, after grouping handoff request process is finished, after not receiving handoff response, notification source BSS is released to the resource that this MS distributes; Source BSS is used for being released to the resource that this MS distributes after notified.
Referring to shown in Figure 4, wherein, target SGSN comprises receiver module and notification module, and receiver module is used for the packet switch process at MS, after grouping handoff request process is finished, do not receive handoff response after, sending to notification module does not have the response indication; Notification module is used for receiving that not having response indication back notification source BSS is released to the resource that this MS distributes.
Source BSS comprises receiver module and release module, and the notice from target SGSN that receiver module is used for receiving sends to release module; Release module is used for being released to the resource that this MS distributes after notified.
The present invention also provides the abnormality eliminating method in another packet switch process, the basic thought of this method is: in the packet switch process of MS, when source BSS sending the grouping switching command to MS after, do not receive handoff response after, source BSS is released to the resource that this MS distributes.
Wherein, described handoff response comprises handover success message and switch failure information, such as, behind the handover success, belong to handover success message from the deletion packet flow context message Delete BSS PFC of source SGSN; Behind the handoff failure, belong to switch failure information from the packet cell gravity treatment failed message Packet Cell Change Failure of MS.
Here can determine that source BSS discharges the time of resource by timer is set, referring to shown in Figure 5, to switch to this abnormality eliminating method of example explanation in the SGSN, in the packet switch process of MS, source BSS is after transmission grouping switching command PS Handover Command is to MS, start this timer, if behind this timer expiry, source BSS does not receive any handoff response, that is to say that source BSS had not both received handover success message, also do not receive switch failure information, so, source BSS will be released in the resource of distributing for this MS in the cell-of-origin automatically.Wherein, timer duration can be provided with according to actual needs.
In addition, source BSS has discharged the resource of distributing for this MS in the cell-of-origin after, can be released in the resource of distributing for this MS in the Target cell by notification target SGSN.
Such as, when in grouping switches to BSS, switching in switching or the SGSN, source BSS sends packet switch cancellation message PS Handover Cancel to source SGSN, and after source SGSN received PS Handover Cancel message, notification target BSS was released to the resource that this MS distributes.
When grouping switches to when switching between SGSN, source BSS sends packet switch cancellation message PS Handover Cancel to source SGSN, after source SGSN receives PS Handover Cancel message, send reorientation cancellation message Relocation Cancel Request to target SGSN, after target SGSN was received RelocationCancel Request message, notification target BSS was released to the resource that this MS distributes.
Corresponding second method, the present invention also provides a provenance BSS, referring to shown in Figure 6, this source BSS comprises receiver module and release module, wherein, receiver module is used for the packet switch process at MS, source BSS send the grouping switching command to MS after, after not receiving handoff response, the notice release module is released to the resource that this MS distributes; Release module is used for being released to the resource that this MS distributes after notified.
In addition, describe as seen by background technology, target SGSN is behind the packet switch cancellation message PS Handover Cancel or the reorientation cancellation message RelocationCancel Request from source SGSN that receive from source BSS, can be released to the resource that this MS distributes by notification target BSS, if and monitoring grouping this moment is switched the timer of execution still in operation, so, behind this timer expiry, target SGSN notification target BSS again is released in the resource of distributing for this MS in the Target cell, causes uncertain unusual generation easily and discharge once more.
For fear of owing to discharging the uncertain unusual generation that causes once more, in the packet switch process of MS, after target SGSN was received switch failure information, target SGSN notification target BSS was released to the resource that this MS distributes, and stopped to monitor the timer that execution is switched in grouping.
Such as, for switching in switching or the SGSN in the BSS, target SGSN can be behind the packet switch cancellation message PS Handover Cancel that receives from source BSS, and notification target BSS is released in the resource of distributing for this MS in the Target cell, and stops to monitor the timer that execution is switched in grouping; For switching between SGSN, target SGSN can be behind the reorientation cancellation message Relocation CancelRequest that receives from source SGSN, and notification target BSS is released to the resource that this MS distributes, and stops to monitor the timer that execution is switched in grouping.Like this, target SGSN just can be after the timer expiry of carrying out not be switched in the monitoring grouping, and notification target BSS is released to the resource that this MS distributes again, thereby has avoided uncertain unusual generation.
The above has carried out further detailed description to purpose of the present invention, technical scheme and beneficial effect; institute is understood that; the above is not in order to restriction the present invention; within the spirit and principles in the present invention all; any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. the abnormality eliminating method in the packet switch process, it is characterized in that, this method comprises: in the packet switch process of mobile station MS, after grouping handoff request process is finished, after destination service universal grouping wireless business supporting node SGSN did not receive handoff response, target SGSN notification source base station system BSS was released to the resource that this MS distributes.
2. method according to claim 1 is characterized in that, also comprises after described grouping handoff request process is finished: target SGSN starts timer;
Described target SGSN notification source BSS further comprises before discharging resource: described timer expiry.
3. method according to claim 2 is characterized in that, described timer is used to monitor the execution that grouping is switched.
4. according to claim 1,2 or 3 described methods, it is characterized in that described grouping switches to when switching in interior switching of BSS or the SGSN,
Described target SGSN notification source BSS discharges resource and comprises: target SGSN sends deletion packet flow context message Delete BSS PFC to source BSS, and source BSS is released to the resource that described MS distributes after receiving Delete BSS PFC message.
5. according to claim 1,2 or 3 described methods, it is characterized in that described grouping switches to when switching between SGSN,
Described target SGSN notification source BSS discharges resource and comprises: target SGSN notification source SGSN handoff failure, source SGSN sends Delete BSS PFC message to source BSS after learning handoff failure, and source BSS is released to the resource that described MS distributes after receiving Delete BSS PFC message.
6. method according to claim 1 is characterized in that described handoff response comprises handover success message and switch failure information.
7. method according to claim 6 is characterized in that, described handover success message is the grouping handoff completion message PS Handover Complete from target BS S.
8. method according to claim 6 is characterized in that, described switch failure information is from the packet switch cancellation message PS Handover Cancel of source BSS or is the reorientation cancellation message Relocation Cancel Request from source SGSN.
9. the abnormality processing system in the packet switch process is characterized in that this system comprises target SGSN and source BSS, wherein,
Target SGSN is used for the packet switch process at MS, after grouping handoff request process is finished, do not receive handoff response after, notification source BSS is released to the resource that this MS distributes;
Source BSS is used for being released to the resource that this MS distributes after notified.
10. system according to claim 9 is characterized in that described target SGSN comprises receiver module and notification module, wherein,
Receiver module is used for the packet switch process at MS, after grouping handoff request process is finished, do not receive handoff response after, sending to notification module does not have the response indication;
Notification module is used for receiving that not having response indication back notification source BSS is released to the resource that this MS distributes.
11. system according to claim 9 is characterized in that, described source BSS comprises receiver module and release module, wherein,
The notice from target SGSN that receiver module is used for receiving sends to release module;
Release module is used for being released to the resource that this MS distributes after notified.
12. a target SGSN is characterized in that this target SGSN comprises receiver module and notification module, wherein,
Receiver module is used for the packet switch process at MS, after grouping handoff request process is finished, do not receive handoff response after, sending to notification module does not have the response indication;
Notification module is used for receiving that not having response indication back notification source BSS is released to the resource that this MS distributes.
13. a provenance BSS is characterized in that, this source BSS comprises receiver module and release module, wherein,
The notice from target SGSN that receiver module is used for receiving sends to release module, and wherein, in the packet switch process of mobile station MS, after grouping handoff request process was finished, target SGSN was not sent described notice after receiving handoff response;
Release module is used for being released to the resource that this MS distributes after receiving described notice.
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| CNA2007101814789A Division CN101155430A (en) | 2006-08-09 | 2006-08-09 | Method and system for handling exception in grouping switch-over course |
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| CN101754311B (en) * | 2008-12-20 | 2013-06-05 | 华为技术有限公司 | Network switching resource processing methods and device |
| WO2011050528A1 (en) * | 2009-10-29 | 2011-05-05 | 华为技术有限公司 | Method, network device and network system for resources release |
| CN102421149B (en) * | 2010-09-28 | 2017-03-22 | 中兴通讯股份有限公司 | Informing method of switching information and base station |
| CN102665246B (en) * | 2012-04-25 | 2015-10-28 | 大唐移动通信设备有限公司 | Its recovery method as resource after the handoff failure of path and equipment |
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