CN100382528C - Flow treatment method for business supporting node of general grouped wireless service network - Google Patents
Flow treatment method for business supporting node of general grouped wireless service network Download PDFInfo
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Abstract
The present invention discloses a method for processing a flow in a service support node (SGSN) in a general packet radio service (GPRS) network. GSNs which need and try to be initiated with flows are filtered by maintaining the path state information of a GPRS tunnel protocol (GTP) among the SGSN and other GPRS support nodes (GSN) by the method and by utilizing the maintained path state information when a flow for activating a packet data protocol (PDP) and an updating (INTER-SGSN RAU) flow of routing areas among SGSNs are initiated by a user so as to delete fault GSNs in the GSNs and initiate flows for the current usable GSN directly. Thus, flows can be directly initiated to the current usable GSN by filtering the fault GSNs at an SSGN by the present invention when users' flows are processed by the SGSN. Thus, the success ratio of flows is increased.
Description
Technical field
The present invention relates to the flow path processing method in the service support node (SGSN) in general packet radio service (GPRS) network, specifically, relate to the method for SGSN inner filtration fault GPRS Support Node (GSN) raising flow process success rate in the GPRS network.
Background technology
At present, the GPRS network and Wideband Code Division Multiple Access (WCDMA) (WCDMA) network development that are applied to high speed Internet access are swift and violent, GPRS network especially, and the commercialization on a large scale in a lot of countries and regions, its network architecture is as shown in Figure 1.As can be seen from Figure 1, the GPRS network user connects with packet data protocol (PDP) network by SGSN and GGSN (GGSN).
Under the GPRS/WCDMA application scenarios, after the cellphone subscriber activates PDP success, the user can surf the web webpage, send EMAIL, transmission or receive multimedia message etc.If the user be in when using packet switching (PS) territory professional advance or moving process in, even see that from the angle of network the user has arrived another SGSN overlay area from a SGSN overlay area, the user can not feel that business has any interruption yet.In these application scenarioss, relate to two more basic flow processs: the Routing Area Update between PDP context activation flow process and SGSN (INTER-SGSN RAU) flow process.
When travelling carriage (MS) is initiated PDP context activation flow process or Inter-SGSN RAU flow process, SGSN need and other GSN (GGSN or SGSN) between carry out interacting message.Routing Area Update flow process between simple PDP context activation flow process and SGSN is distinguished as shown in Figures 2 and 3, because the present invention pays close attention to SGSN and the internodal flow process of other GSN, this paper does not describe the flow process between other network nodes.
Communication is based on GPRS Tunnel Protocol/user datagram protocol/the Internet protocol (GTP/UDP/IP), because UDP does not guarantee the reliability transmitted to provide overtime retransmission mechanism by application layer between the GSN node.According to 3GPP 29.060 agreements, if GSN not response in opposite end is waited for T3 after the time, SGSN will continue to retransmit this message, up to reaching maximum number of times of transmission N3 time.If the response of still not receiving opposite end GSN after retransmitting for N3 time, so this time PDP context activation flow process or Inter-SGSNRAU flow process have just been failed.Be exactly to activate failure for the user, perhaps current service is interrupted, and can not use PS territory business.According to the operation conditions of existing network, GSN really delays machine and the probability that can't respond is seldom, and GTP message is overtime to have accounted for bigger proportion owing to IP network reason between GSN causes.If can guarantee message issues a normal GSN of communication and can reduce PDP context activation flow process or the failure of Inter-SGSN RAU flow process former owing to network thereby that cause undoubtedly greatly.
On some SGSN equipment of existing network, after the SGSN node is obtained corresponding GSN address according to APN (APN) or old Routing Area Identifier (old RAI) information, whether can reach, attempt successively according to the sufficient address tabulation when initiating PDP context activation flow process or INTER-SGSN RAU flow process if not considering that this GSN node is current.Shown in Fig. 4 prior art flow chart, SGSN obtains the GSN address ip 1 that needs to attempt initiating PDP context activation flow process or INTER-SGSN RAU flow process by dns resolution, IP2, behind IP3 and the IP4, although SGSN is unusual to link between the GSN IP1, SGSN still sends a request message to it.N3*T3 is after the time, because opposite end GSN does not have response, SGSN has to select next GSN to continue to attempt, i.e. GSN IP2, if but GSN IP2 does not still have response, need also to wait for once more that N3*T3 after the time, just can issue normal GSN IP3.But at this moment the agreement timer of MS side may be overtime, and this time PDP context activation flow process or INTER-SGSN RAU flow process end in failure.
Summary of the invention
The object of the present invention is to provide the flow path processing method in the SGSN in a kind of GPRS network,, improve the flow process success rate with filter faults GSN.
The present invention is achieved through the following technical solutions:
Flow path processing method in a kind of GPRS network in the SGSN, this method may further comprise the steps at least:
A) safeguard GTP routing information table between GSN, failure path in the information table of path and available path are carried out detecting periodically, upgrade described routing information table, comprise two ends, path address information, path status according to result of detection by ECHO message;
B) in initiating PDP context activation flow process or INTER-SGSN RAU flow process, when SGSN need connect with other GSN, according to A) the middle GTP routing information table filter faults GSN that safeguards, the only request that connects to the normal GSN initiation of state.
Wherein, described steps A comprises:
To the failure path in the current path information table, SGSN periodically sends ECHO message to this failure path and surveys, if reply, the state that then changes this failure path is a upstate, otherwise this path status remains malfunction;
To the available path in the current path information table, SGSN periodically sends ECHO message to this available path and surveys, if reply, then path status remains upstate, if the no response of ECHO message continues N3 time, the state that then changes this available path is a malfunction.
GTP path among the above-mentioned steps A, ECHO message, reply, detective path cycle and N3 be 3GPP agreement defined.
Send the cycle of ECHO message and send cycle of ECHO message identical or different to current available path to current failure path.
Wherein, described step B comprises:
B01) obtain the IP address list of the GSN of the start flow of wanting by dns resolution according to APN or old RAI information;
B02) SGSN is according to the GTP routing information list deletion B01 that is safeguarded) IP address list after obtaining fault GSN address in the tabulation and obtaining filtering;
B03) SGSN is to B02) in GSN start flow in the IP address list after the filtration that obtains.
Fault GSN in the tabulation of obtaining deletion B01 described step B02)) comprises that first list item begins from tabulation at every turn, deletes successively until last list item.
Described B02) in the operation of deletion fault GSN, the order of deletion back address space left remains unchanged in the described IP address list.
The present invention is by safeguarding the GTP path status information between this SGSN and other GSN at SGSN, when the user initiates to activate PDP flow process and Inter-SGSN RAU flow process, utilize the GTP path status information of being safeguarded that the GSN that needs start flow is filtered, deletion fault GSN wherein, directly attempt current available GSN, thereby saved the time of attempting fault GSN, improved the success rate of flow process.
Description of drawings
Fig. 1 is the GPRS network framework map.
Fig. 2 is the PDP context activation flow chart.
Fig. 3 is the Routing Area Update flow chart between SGSN.
Fig. 4 is the prior art flow chart.
Fig. 5 is a flow chart of the present invention.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
In the present invention, SGSN need safeguard the GTP routing information table between this SGSN and other GSN, realizes in the following manner:
At any time, GTP routing information table between SGSN all in store one and other GSN, this is the in service acquisition of SGSN before this moment, in this routing information table, exists the path of two states, failure path and available path, if GTP routing information table is empty, i.e. in service before SGSN, the GTP path is not set up as yet or is deleted, in this case, all paths all are regarded as available path;
To the failure path in the current path information table, SGSN periodically sends ECHO message to this failure path and surveys, if reply, the state that then changes this failure path is a upstate, otherwise this failure path state remains malfunction;
To the available path in the current path information table, SGSN periodically sends ECHO message to this available path and surveys, if reply, then remain can all states for the state of this available path, if the no response of ECHO message continues N3 time, changing this available path state is malfunction.
The present invention to the processing of PDP context activation flow process and Inter-SGSN RAU flow process referring to shown in Figure 5.
When MS initiates PDP context activation flow process (referring to Fig. 2), can determine to handle this flow process by certain SGSN in the GPRS network with the MS position.After this SGSN receives that MS activates the PDP Context request, obtain the IP address list (this APN may corresponding one or more GSN address) of the APN that MS will connect by dns resolution, according to this SGSN that SGSN safeguarded and the GTP path status information filtering fault GSN address between other GSN, directly initiate the PDP context activation flow process then to current available GSN.In this flow process, if only corresponding GSN address of APN, the present invention is identical with the function of existing techniques in realizing so: if this GSN fault, after filtering, SGSN will obtain the GSN address list of a sky, directly response MS flow process failure, with existing scheme send message to fault GSN, to wait for that N3*T3 reinforms MS failure effect after the time the same; If this GSN is normal, SGSN will obtain this GSN address after filtering, and initiate the PDP context activation flow process to this GSN.Under the situation of the corresponding a plurality of GSN of APN address, certain GSN may be configured to first-selection in the dns resolution process, promptly in the IP address list of obtaining by the DNS inquiry, this GSN address is in first row in table, when its just often, obtaining with this GSN after SGSN filters is the address list of first-selection, and subsequent treatment is identical with existing scheme, and the GSN in address list initiates the PDP context activation flow process successively; When it breaks down, SGSN will obtain other normal GSN address lists, to these normal GSN start flows, the flow process of having avoided causing because of this GSN fault is failed, in case and this GSN path recovers normal, because the deletion of fault GSN all is that first list item begins from tabulation in the IP address list that inquiry obtains to DNS at every turn, carry out successively until last list item, and in the operation of deletion fault GSN, the order of deletion back address space left remains unchanged in the IP address list, thus SGSN promptly to revert to still be the first-selection of start flow with this GSN.
After MS activates the PDP success, bring into use PS territory business, if when in use the MS position enters into another SGSN overlay area by a SGSN overlay area, MS need carry out Inter-SGSN RAU flow process (referring to Fig. 3).In this flow process, MS at first sends the Routing Area Update request to new SGSN, after new SGSN receives request, obtain the address list of the SGSN that is connected with MS by dns resolution according to the old RAI information of MS, according to this SGSN that SGSN safeguarded and the GTP path status information filtering fault GSN address between other SGSN, directly initiate Inter-SGSN RAU flow process then to current available SGSN.
Above-mentioned general packet radio service tunnel protocol path, ECHO message, reply, detective path cycle and N3 be 3GPP agreement defined.
The present invention is not limited to the concrete introduction of the foregoing description.The present invention can further upgrade, and perhaps new in addition to feature disclosed in this invention combination also can be upgraded or newly makes up any method disclosed in this invention or process.
Claims (6)
1. the flow path processing method of a business supporting node of general grouped wireless service network is characterized in that, this method may further comprise the steps at least:
A) safeguard general grouped wireless service network tunnel protocol routing information table between the general grouped wireless service network support node, by ECHO message failure path in the information table of path and available path are carried out detecting periodically, upgrade described routing information table according to result of detection, routing information comprises two ends, path address information, path status at least;
B) between initiation packet data protocol contexts activation process or business supporting node of general grouped wireless service network in the Routing Area Update flow process, when business supporting node of general grouped wireless service network need connect with other general grouped wireless service network support nodes, according to A) the middle general grouped wireless service network tunnel protocol routing information table filter faults general grouped wireless service network support node of safeguarding, the only request that connects to the normal general grouped wireless service network support node initiation of state.
2. method according to claim 1 is characterized in that, described steps A comprises:
To the failure path in the current path information table, business supporting node of general grouped wireless service network periodically sends ECHO message to this failure path and surveys, if reply, the state that then changes this failure path is a upstate, otherwise this path status remains malfunction;
To the available path in the current path information table, business supporting node of general grouped wireless service network periodically sends ECHO message to this available path and surveys, if reply, then path status remains upstate, if the no response of ECHO message continues N3 time, the state that then changes this available path is a malfunction.
3. method according to claim 2 is characterized in that, send the cycle of ECHO message to current available path identical or different with the cycle that sends ECHO message to current failure path.
4. method according to claim 1 and 2 is characterized in that, described step B comprises:
B01) APN that will connect according to the user or user's former Routing Area Identifier information are resolved the IP address list of the general grouped wireless service network support node that obtains the start flow of wanting by domain name system;
B02) business supporting node of general grouped wireless service network is according to the general packet radio service tunnel protocol path information table of being safeguarded, deletion B01) IP address list after fault general grouped wireless service network support node in the tabulation of obtaining obtains filtering;
B03) business supporting node of general grouped wireless service network is to B02) in general grouped wireless service network support node start flow in the IP address list after the filtration of obtaining.
5. method according to claim 4, it is characterized in that, fault general grouped wireless service network support node in the tabulation of obtaining described deletion B01 step B02)) comprises that first list item begins from tabulation at every turn, deletes successively until last list item.
6. method according to claim 4 is characterized in that, B02) in the operation of deletion fault general grouped wireless service network support node, the order of deletion back address space left remains unchanged in the described IP address list.
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| CN101448251B (en) * | 2008-04-28 | 2011-05-11 | 中兴通讯股份有限公司 | Method for assigning tunnel identifier and service gateway thereof |
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| US20040032865A1 (en) * | 2002-08-16 | 2004-02-19 | Pharmacia Corporation | Apparatus and method for establishing a call connection state in a packet data communication system |
| CN1535546A (en) * | 2001-04-30 | 2004-10-06 | 温福瑞阿网络有限公司 | System and method of selecting GGSN in mobile communications network |
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| CN1535546A (en) * | 2001-04-30 | 2004-10-06 | 温福瑞阿网络有限公司 | System and method of selecting GGSN in mobile communications network |
| US20040032865A1 (en) * | 2002-08-16 | 2004-02-19 | Pharmacia Corporation | Apparatus and method for establishing a call connection state in a packet data communication system |
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