CN100466595C - Error indication message processing method - Google Patents

Error indication message processing method Download PDF

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Publication number
CN100466595C
CN100466595C CNB2004100537802A CN200410053780A CN100466595C CN 100466595 C CN100466595 C CN 100466595C CN B2004100537802 A CNB2004100537802 A CN B2004100537802A CN 200410053780 A CN200410053780 A CN 200410053780A CN 100466595 C CN100466595 C CN 100466595C
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China
Prior art keywords
indication message
message
context
gsn
time
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Expired - Fee Related
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CNB2004100537802A
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Chinese (zh)
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CN1738285A (en
Inventor
罗鹏
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Shanghai Huawei Technologies Co Ltd
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Shanghai Huawei Technologies Co Ltd
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Abstract

The invention discloses an error indication message processing method, relating to the communication field, which can effectively prevent the illegal attacker damaging the communication network via the error indication message The theory of said invention comprises: adding a time mark on the local PDP context and the RAB context of source GSN or RNC for showing the time that the source GSN or RNC sends the G-PDU message to the target GSN or RNC; when receiving the error indication message from the target GSN or RNC, judging if the difference between the receiving time and the time mark is less than the preset threshold value, to judge if the G-PDU message relative to said PDP or RAB context has been sent, then finding the illegal error indication message to throw away.

Description

Mistake indication message processing method
Technical field
The present invention relates to the communications field, particularly the safe practice in 3G (Third Generation) Moblie (The Third Generation is called for short " the 3G ") system.
Background technology
Along with being the high-tech development of sign with the communication technology and computer technology, cellular mobile communication brings great convenience to people, the three generations has been experienced in its development at present, now third generation cellular mobile communication has been obtained breakthrough, discussion and research through various telecommunications normal structures, it has formed three main world standards, Wideband Code Division Multiple Access (WCDMA) (Wideband Code Division MultipleAccess, be called for short " WCDMA ") is exactly one of technology of wherein tool potentiality.
The WCDMA communication system has adopted Radio Access Network (Radio Access Network is called for short " RAN ") to add the core network structure of (Core Network is called for short " CN ").Wherein RAN is used to handle all and wireless function associated, and CN handles that all voice calls are connected with data in the WCDMA system, and the exchange of realization and external network and routing function.Usually also universal mobile telecommunications system (Universal Mobile Telecommunications System is called for short " UMTS ") system is called the WCDMA communication system.In the WCDMA core net, UMTS/ GPRS (General Packet Radio Service, be called for short " GPRS ") backbone network and wireless universal packet service support node (GPRS SupportNode, what the user data transmission abbreviation " GSN ") adopted is wireless universal packet service tunnel protocol user plane protocol (GPRS Tunneling ProtocolUser is called for short " GTP-U ").Simultaneously, at radio network controller (Radio Network Controller, be called for short " RNC ") and GPRS serving GPRS support node (Serving GPRS SupportNode is called for short " SGSN ") between user data transmission also adopted the GTP-U agreement to carry.
The technical staff who is familiar with the ability city knows that CN is from being divided into circuit switching (CircuitSwitched is called for short " CS ") territory and packet switching (Packet Switched is called for short " PS ") territory in logic.And 3G (Third Generation) Moblie collaborative project (The Third Generation Partnership Project, abbreviation " 3GPP ") regulation among the TS 23.060, when 3G subscription carries out the PS business at needs, initiation packet data protocol (Packet Data Protocol in 3G network at first, be called for short " PDP ") context active flow, be to pass through this flow process in the UMTS network at travelling carriage (Mobile Station, be called for short " MS ") and gateway GPRS supporting node (GGSN) (GPRS Gateway Support Node, abbreviation " GGSN ") creates a wireless universal packet service tunnel protocol (GPRSTunneling Protocal is called for short " GTP ") tunnel between for transfer of data.For the ease of comparative descriptions, under the GPRS network and the PDP context activation flow process contrast down of UMTS network, the two has similar part that difference is also arranged, and below in conjunction with Fig. 1, describes in the agreement flow process of MS activation PDP Context under the GPRS network earlier:
As shown in Figure 1, this process relates to 4 parts and the two kinds of algorithm process processes in the gprs system, be respectively travelling carriage 10, base station sub-system (Base Station System, be called for short " BSS ") 11, second generation GPRS serving GPRS support node (2G-Serving GPRS Support Node, be called for short " 2G-SGSN ") 12, second generation gateway GPRS supporting node (GGSN) (2G-GPRSGateway Support Node, be called for short " 2G-GGSN ") 13, and cell selecting algorithm C1 algorithm 14 and sub-district reselection algorithm C2 algorithm 15.Wherein step 101 and step 102 quilt of C1 algorithm in Fig. 1 uses, and the C2 algorithm uses in a step 106 and step 107 quilt.
At first in step 101, MS10 sends packet data protocol context activation request, i.e. " Activate PDP Context Request " message to 2G-SGSN12.Need to prove that this activates request message is to transmit through the tunnel that the GTP agreement of BSS11 is set up, and is equivalent to through base station system 11 transparent transmissions.
Next, in step 102, carry out security inspection, promptly 2G-SGSN12 carries out discriminating of MS identity and equipment inspection.
Subsequently, in step 103,2G-SGSN12 sends " Invoke Trace " to BSS11, promptly calls the path.
After this, in step 104, if identity is differentiated and equipment inspection has all been passed through, the PDP message information that 2G-SGSN12 provides by MS10 set up and 2G-GGSN12 between the PDP Context request.
In step 105,2G-SGSN12 sets up the response of PDP protocol context request to 2G-GGSN13.
Then, in step 106, BSS11 and 2G-SGSN12 carry out the packet flow context of base station process.
At last, to step 107, insert Network Service Access Point Identifier (Network Service Access Point Identifier is called for short " NSAPI ") behind the GGSN address of 2G-SGSN12 in its PDP context.And return the PDP protocol context activation to MS10 and finish message, be i.e. " Activate PDPContext Accept ".The PDP context activation flow process finishes simultaneously, and the GTP tunnel for transfer of data is created between MS10 and 2G-GGSN13.
Next in conjunction with Fig. 2, the flow process that MS under the UMTS network activates PDP Context is described in the agreement:
As shown in Figure 2, this process relates to 4 parts and the two kinds of algorithm process processes in the UTMS system, be respectively travelling carriage 20, UMTS Terrestrial radio access network 21, third generation GPRS serving GPRS support node (3G-Serving GPRS Support Node, be called for short " 3G-SGSN ") 22, third generation gateway GPRS supporting node (GGSN) (3G-GPRS Gateway Support Node, be called for short " 3G-GGSN ") 23, and cell selecting algorithm C1 algorithm 24 and sub-district reselection algorithm C2 algorithm 25.Wherein step 201 and step 202 quilt of C1 algorithm in Fig. 2 uses, and the C2 algorithm uses in a step 208 and step 209 quilt.
Equally, in the UMTS network, step 201, MS20 sends packet data protocol context activation request, i.e. " Activate PDP Context Request " message to 3G-SGSN22.
After this, in step 202, the PDP message information that 3G-SGSN22 provides by MS20 set up and 3G-GGSN23 between packet data protocol context request.
Step 203 is exactly 3G-GGSN23 sets up the PDP protocol context request to 3G-SGSN22 response.
Next, in step 204, set up RAB (Radio Access Bearer is called for short " RAB ") by RAB Assignment procedure.
Then in the step 205,3G-SGSN22 should send " Invoke Trace " message, promptly calls the path to UTRAN21.
After this, if the QoS attribute is lowered in the context of step 202 and step 203 is connected, step 206,3G-SGSN22 should be by renewal PDP protocol context request, the i.e. relevant 3G-GGSN23 of " Update PDP ContextRequest " message informing.
Later step 207,3G-GGSN23 upgrades the response of PDP context by returning, i.e. service quality (Quality of Service is called for short " the QoS ") attribute that " Update PDP Context Response " message confirmation is new.
At last, in step 208, insert Network Service Access Point Identifier NSAPI behind the GGSN address of 3G-SGSN22 in its " PDP context ".And return the PDP protocol context activation to MS20 and finish message, be i.e. " Activate PDP Context Accept " message.The PDP context activation flow process finishes simultaneously, and the GTP tunnel for transfer of data is created between MS and 3G-GGSN.
Some concrete step is not both because the difference of each subsystem interface forms under above-mentioned two kinds of networks, and is similar on the general principles.As seen from the above, 3G network has all been created relevant PDP Context among MS, SGSN and the GGSN after once successful PDP context activation flow process is finished, created RAB in RNC.The GTP logical tunnel of these PDP Context appointments subsequently will transmit various user data.
In the process that transmits user data, when a GSN or RNC when another GSN or RNC send the GTP data message, purpose GSN or RNC will search corresponding PDP Context or RAB according to the Tunnel Identifier in the GTP message header under the normal condition, according to this message of the information processing among PDP Context or the RAB.But also have under the unusual situation,, then send wrong indication (Error Indication) message to sending source GSN/RNC if can't find the PDP Context or the RAB of activation according to Tunnel Identifier.When source GSN/RNC receives this Error Indication message, will delete this PDP Context.The information part that concrete Error Indication message comprises is seen table by agreement 3GPP TS 23.090 definition:
Information element (informational content) Presence requirement (exist and require) Reference (relating to agreement)
Tunnel Endpoint Identifier Data I (tunneling termination flag data) Mandatory (essential) 7.7.13
GSN Address (GSN address) Mandatory (essential) 7.7.32
Private Extension (privately owned expansion) Optional (optional) 7.7.44
By foregoing description as can be known, when the user in WCDMA carries out the data transmission, run into abnormal conditions, promptly can not find the PDP Context or the RAB of activation according to Tunnel Identifier, need so to start to sending the emergency mechanism that source GSN or RNC send Error Indication message, to guarantee that telecommunication system resources can not taken by exceptional signaling or passage.
In the prior art scheme, processing for this Error Indication message, each big mobile communication equipment manufacturer's common practice as shown in Figure 3, purpose GSN or RNC receive a wireless universal packet service tunnel protocol-protocol Data Unit (GPRS Tunneling Protocal-Protocol DataUnit, be called for short " G-PDU ") after, if do not have corresponding PDP Context or the RAB context that activates, then send Error Indication message immediately.After Error Indication message arrived source GSN or RNC, source GSN or RNC started emergency mechanism immediately, deletion local corresponding PDP Context or RAB context.
Need to prove, after the GTP logical tunnel is set up, when carrying out the user data transmission therein, user data is divided into PDP Packet Data Unit one by one, i.e. G-PDU packet one by one, purpose GSN or RNC send in order, so can check corresponding PDP Context or RAB context at each G-PDU.PDP Context or RAB context that the G-PDU correspondence of transmission is arranged on source GSN or the RNC when data transmit all the time, might under abnormal conditions, there be corresponding PDP Context or the RAB context that activates on purpose GSN or the RNC, feed back to source GSN or RNC so Error Indication message will send, otherwise can take all the time source GSN or RNC system resource and and purpose GSN or RNC between channel.
And on the other hand, in the WCDMA networking plan, prevent from the invalid packet of automatic network to attack by set up the tunnel of encrypting for signaling message usually, thereby guarantee the safety of GTP-C or RANAP signaling message.But, may user's face passage not carried out encryption for guaranteeing the forward efficiency of user data.
In actual applications, there is following problem in such scheme: the safety that can't effectively ensure communication network.
Cause the main cause of this situation to be, the fact that rogue attacks person might not carry out encryption at user's face passage successfully utilizes Error Indication message that network is attacked.Specifically, rogue attacks person can forge a large amount of false Error Indication messages, send to GSN or RNC by public network, all tunnel endpoint identifier to GSN or RNC scan one by one, thereby cause GSN or RNC to delete user's PDP Context or RAB context in a large number, cause the entire equipment paralysis.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of Error Indication message processing method, makes it possible to effectively prevent that rogue attacks person from destroying communication network by Error Indication message.
For achieving the above object, the invention provides a kind of wrong indication message processing method, comprise following steps:
When A creates each local block data protocol context at source wireless universal packet service support node, joining day is stabbed item in this context, and at every turn after purpose wireless universal packet service support node sends wireless universal packet service tunnel protocol-protocol data unit message, record sends the time of described wireless universal packet service tunnel protocol-protocol data unit message on the described timestamp of the described block data protocol context of correspondence;
When B receives from the mistake of described purpose wireless universal packet service support node indication message when described source wireless universal packet service support node, judge time of described timestamp item of the block data protocol context of this mistake indication message correspondence, and whether receive time difference between time of this mistake indication message less than the threshold value that sets in advance, if, then carry out normal process, otherwise, abandon this mistake indication message.
Wherein, among the described step B, when the time of the described timestamp item of the block data protocol context of decision error indication message correspondence and time difference between the time that receives this mistake indication message are not less than the threshold value that sets in advance, also comprise this wrong step of indicating the daily record of packet loss logout.
The present invention also provides a kind of wrong indication message processing method, comprises following steps:
When A creates each local wireless access bearer context at source radio network controller, joining day is stabbed item in this context, and at every turn after the purpose radio network controller sends wireless universal packet service tunnel protocol-protocol data unit message, record sends the time of described wireless universal packet service tunnel protocol-protocol data unit message on the contextual described timestamp of the described RAB of correspondence;
When B receives from the mistake of described purpose radio network controller indication message when described source radio network controller, judge the time of the contextual described timestamp item of RAB of this mistake indication message correspondence, and whether receive time difference between time of this mistake indication message less than the threshold value that sets in advance, if, then carry out normal process, otherwise, abandon this mistake indication message.
Wherein, among the described step B, when the time of the contextual described timestamp item of RAB of decision error indication message correspondence and time difference between the time that receives this mistake indication message are not less than the threshold value that sets in advance, also comprise this wrong step of indicating the daily record of packet loss logout.
By relatively finding, technical scheme difference with the prior art of the present invention is, in source GSN or local PDP Context of RNC and RAB context, increased the timestamp item, be used to represent that source GSN or RNC send the current time of G-PDU message to purpose GSN or RNC.Behind the Error Indication message of receiving from purpose GSN or RNC, the time difference of comparing the moment in current time and the timestamp, judge whether sent the G-PDU message that PDP Context therewith or RAB context interrelate recently, illegal Error Indication message is found out and abandoned thus.
Difference on this technical scheme has brought comparatively significantly beneficial effect, prevents effectively that promptly rogue attacks person from attacking communication network by Error Indication message, improved the fail safe of communication network.
Description of drawings
Fig. 1 is the PDP context activation schematic flow sheet under the GPRS network in the prior art;
Fig. 2 is the PDP context activation schematic flow sheet under the UMTS network in the prior art;
Fig. 3 is an Error Indication message handling process schematic diagram in the prior art;
Fig. 4 is the schematic flow sheet of Error Indication message processing method according to an embodiment of the invention.
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.
Generally speaking, principle of the present invention is, by in source GSN or local PDP Context of RNC and RAB context, increase and be used to represent that source GSN or RNC send the timestamp of the current time of G-PDU message to purpose GSN or RNC, and behind the ErrorIndication message of receiving from purpose GSN or RNC, the time difference of comparing the moment in current time and the timestamp, judge thus and whether sent the G-PDU message that PDP Context therewith or RAB context interrelate recently, if do not have, it is illegal then can doing fixed this Error Indication message, and abandons.Thereby guaranteed effectively to prevent that rogue attacks person from attacking communication network by Error Indication message.
Below in conjunction with Fig. 4, launch according to one embodiment of present invention, further explain and illustrate the principle and the workflow of the Error Indication message processing method that the present invention proposes.
Those of ordinary skill in the art know, as 3-G (Generation Three mobile communication system) (ThirdGeneration, abbreviation " 3G ") Wideband Code Division Multiple Access (WCDMA) (the Wide CodeDivision Multiple Access of one of two big main flow systems, be called for short " WCDMA ") system, on function, form by three parts: core net (Core Network, abbreviation " CN "), UMTS grounding wireless access network (UMTSTerrestrial Radio Access Network, be called for short " UTRAN ") and subscriber equipment (UserEquipment is called for short " UE ").General compatible packet radio service (the General Packet RadioService of CN, be called for short " GPRS ") net, two important network elements that it comprises are respectively GPRS serving GPRS support node (Serving GPRS Support Node, be called for short " SGSN ") and GGSN (Gateway GPRS Support Node is called for short " GGSN ").UTRAN is by one or more RNSs (Radio Network Subsystem, be called for short " RNS ") constitute, a RNS then is made of a radio network controller (Radio Network Controller is called for short " RNC ") and one or more B node.UE then is the interface with the user, generally is our common mobile phone.
When 3G subscription need carry out packet switching (Packet Switch, be called for short " PS ") when professional, must at first be connected on the 3G network, make the user change ready state into from idle condition, this ready state is exactly that the user has been connected to 3G and has been in the state that starts packet data protocol (Packet Data Protocol is called for short " PDP ") connection.When the user is in ready state, then just will enter flow process of the present invention among Fig. 4.
As shown in Figure 4, at first in step 501, initiate and activate the PDP Context flow process.In this flow process, the user at first sends a message that activates the PDP Context request to the source gateway support node (GPRS Support Node is called for short " GSN ") at its place of user; After source GSN receives this message, will judge whether to carry out the authentication ciphering program, if insert then just do not need to carry out the authentication ciphering program for anonymous; After executing the authentication ciphering program, source GSN verifies the user according to related content in the signatory record of PDP Context, sends out to the purpose GSN at grouped data recipient place then and creates the PDP Context request message; Purpose GSN receives and creates after the PDP Context request message, will return one to source GSN and create the PDP Context response message; Source GSN receives after the establishment PDP Context message that purpose GSN sends, and then returns one to the user and activates the message that PDP Context is accepted, and comprises the PDP type in this message, pdp address, the information such as route of user and purpose GSN.The user has just entered the PDP state of activation after receiving that activation PDP Context that source GSN sends over is accepted.
Execution in step 502 subsequently.In this step, source GSN or RNC create relevant local PDP Context or relevant local RAB context.Need to prove that source GSN or RNC have also increased a timestamp item newly among the present invention in PDP Context or RAB context.
The use of this timestamp item is, when source GSN or RNC when purpose GSN or RNC transmit GPRS Tunnel Protocol (GPRS Tunnel Protocol is called for short " GTP ") message, record current forwarding time on the timestamp item.When purpose GSN or RNC receive that the GTP message does not but find corresponding PDP Context or RAB context, feed back to miscue (ErrorIndication to source GSN or RNC, be called for short " EI ") during message, just can judge whether transmitted recently and the pairing GTP message of this Error Indication message according to the forwarding time of writing down on the timestamp, if transmitted the GTP message of Error Indication message correspondence therewith recently really, then corresponding PDP Context or RAB context handled; If do not transmit the message of this EI correspondence, conclude that then this EI is an invalid message, and give up this Error Indication message, this rogue attacks with regard to having prevented that effectively the hacker from utilizing illegal Error Indication message to carry out; In fact this is exactly a kind of overtime thought.And in the prior art, because the not free item that stabs in local PDP Context or the RAB context, therefore even when source GSN or RNC receive illegal Error Indication message, it judges that also this illegal ErrorIndication message is legal, and according to this relevant local PDP Context of illegal Error Indication message deletion or RAB context.
In addition, among the present invention, source GSN or RNC start a counter after purpose GSN or RNC E-Packet, set in advance a threshold values, and this threshold values is that source GSN or RNC judge the foundation that the Error Indication message that receives is whether legal.Therefore this threshold values should rationally be provided with, can not too greatly can not be too little.If the threshold values of setting is too big, it is legal then just the illegal Error Indication message that sends over from other public networks that receives may to be judged to, and corresponding PDP Context or the RAB context of deletion, and system equipment is paralysed; If the threshold values of setting is too little, then just the legal Error Indication message that feeds back from purpose GSN or RNC that receives may be judged to illegally, and abandon this legal Error Indication message, continue to keep PDP Context or the RAB context that to delete, make information redundancy on source GSN or the RNC.So at first should be according to transmission path and current network transmission congestion situation, calculate message and between source GSN or RNC and purpose GSN or RNC, come transmission back needed average time, threshold values is set to equal or is slightly larger than this average time then, so just makes False Rate minimum as much as possible.After source GSN or RNC set threshold values, just enter step 503.
Then, in step 503, purpose GSN or RNC receive the GTP message that source GSN or RNC send over, and judge according to above-mentioned GTP message whether to find corresponding PDP Context or RAB context then.In this step, purpose GSN or RNC search according to the tunnel sign that extracts from the GTP header whether corresponding PDP Context or RAB context are arranged, and this PDP Context or RAB context are created by the activation process of step 501 when business begins.
If purpose GSN or RNC have lost the PDP Context or the RAB context that activate, then, enter step 505 according to the PDP Context or the RAB context of tunnel tag lookup less than the activation of correspondence; If can find the PDP Context or the RAB context of corresponding activation, then enter step 504.
In step 504, the GTP message that PDP Context that purpose GSN or RNC basis find or the contextual information butt joint of RAB are received is handled, return messages are given source GSN or RNC simultaneously, tell source GSN or RNC purpose GSN or RNC to find corresponding PDP Context or RAB context also the GTP message of receiving to be transmitted.Then, purpose GSN or RNC at first are forwarded to message the RNC at purpose user place, after RNC receives message, message are forwarded to the B node at purpose user place, issue the purpose user by the wave point of B node at last, finish transmission of packet data.Then enter step 509.
In step 505, because purpose GSN or RNC do not find the activation PDP Context or the RAB context of correspondence, so send Error Indication message to source GSN or RNC, this ErrorIndication message comprises endpoint of a tunnel identifier data, GSN address, enciphered message.Wherein endpoint of a tunnel identifier data item and GSN address entries must be filled in, and encrypted entry can be filled in and can not filled in, by the signaling message decision of correspondence.If the tunnel of signaling message transmission is encrypted, then encrypted entry need be filled in; If the tunnel of signaling message transmission is not encrypted, then encrypted entry does not need to fill in.In order to guarantee the forward efficiency of user data, generally user's face passage is not carried out encryption in the prior art, this just makes the hacker forge a large amount of false Error Indication messages and utilizes public network to carry out rogue attacks to become possibility.
After source GSN or RNC receive the Error Indication message that is sended over by purpose GSN or RNC, enter step 506, source GSN or RNC check that the timestamp item is by the time of step 502 record on the PDP Context of Error Indication message correspondence or the RAB context, the time that deducts timestamp item record with the current time obtains a time difference then, relatively should the time difference and the size of the threshold values that is provided with of source GSN or RNC, if should the time difference less than threshold values, then enter step 507; If should the time difference greater than threshold values, then enter step 508.
In step 507, because the time difference is less than threshold values, and threshold values is provided with according to minimum False Rate, so we assert that the Error Indication message that this purpose GSN or RNC send over is legal, its also shows simultaneously the PDP Context of purpose GSN or RNC correspondence or RAB context because certain cause specific is lost, can not find the transmission of packet data path, Packet Service can not continue.So the PDP Context that GTP triggers or the RAB context by step 502 transmission of source GSN or RNC deletion Error Indication message correspondence, discharging existing failed PDP connects shared transmission tunnel and connects the resource of being distributed for the PDP of this inefficacy, return messages are given the user who initiates this packet switching service simultaneously, telling this user this time to connect fails, data can not be sent to the purpose user, and then resource waiting list information is checked by system.
In this case, if the system resource waiting list is not empty, then this user is added resource waiting list last-of-chain, and choose the user of resource waiting list begin chain, be begin chain Client-initiated packet switching service application related resource, return messages tell the user please initiation packet reciprocal exchange of business request again after a while for this user simultaneously; If the system resource waiting list is empty, then this user is added resource waiting list begin chain and choose this user, again apply for related resource for this user's packet switching service this time, return messages tell this custom system attempting reconnecting for this user simultaneously, please this user wait.Certainly for fear of infinitely reconnecting owing to certain cause specific (such as the GSN or the temporary transient unavailable or unexpected damage of RNC at purpose user place), system should set and reconnect upper limit number of times, reconnects number of times and just no longer reconnects above the number of times upper limit.
On the other hand, in step 508, because the time difference is greater than threshold values, and threshold values is provided with according to minimum False Rate, so we assert that this Error Indication message that source GSN or RNC receive is illegal, so continue to keep PDP Context or the RAB context of creating by step 502, and abandon this illegal Error Indication message and log.
Certainly, operation still might surpass the legal Error Indication packet loss of counting initial value when arriving source GSN or RNC owing to certain cause specific (such as network congestion) like this, make source GSN or RNC continue to keep PDP Context or the RAB context that had lost efficacy, waste system resource.Take place for fear of this situation, when surpassing the counting initial value, system does not receive also that purpose GSN or RNC return finds corresponding PDP Context or the contextual information of RAB, just resends the GTP message.On the other hand, system also can set one and retransmit the number of times upper limit, retransmit number of times and surpass just no longer repeating transmission in limited time on the number of times, system assert that also purpose GSN or RNC have lost corresponding PDP Context or RAB context this moment, so source GSN or corresponding PDP Context or the RAB context of RNC deletion, discharge that this existing failed PDP connects shared transmission tunnel and connect the resource of being distributed for this PDP that had lost efficacy, return messages are given the user who initiates this packet switching service simultaneously, tell this user this time to connect and fail that data can not be sent to the purpose user.
Ensuing operation and step 507 are just the same, and the resource waiting list is checked by system, if formation is not sky then chooses the queue heads user and apply for related resource for him; If be sky then choose this user to apply for resource again for this user.The concrete operations details just is not repeated here.
In step 509, grouped data has correctly arrived the purpose user, and this time the packet data exchanged business is finished, so system's deexcitation PDP Context.Specifically, at first the user sends the source GSN of deexcitation PDP Context request to its place; Source GSN carries out the authentication ciphering program and verifies the user then, then sends the request of deletion PDP Context to the purpose GSN at purpose user place; Purpose GSN receives after the deletion PDP Context request message, will return a deletion PDP Context response message to source GSN; Source GSN receives after the deletion PDP Context response message that purpose GSN sends, and then returns the message that a deletion PDP Context is accepted to the user; The user receives the deexcitation flow process of just having finished PDP Context after the message that the deletion PDP Context accepts, and system is released to all resources that this packet switching service is distributed.
Though by reference some preferred embodiment of the present invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that, can do various changes to it in the form and details, and the spirit and scope of the present invention that do not depart from appended claims and limited.

Claims (4)

1. a wrong indication message processing method is characterized in that, comprises following steps:
When A creates each local block data protocol context at source wireless universal packet service support node, joining day is stabbed item in this context, and at every turn after purpose wireless universal packet service support node sends wireless universal packet service tunnel protocol-protocol data unit message, record sends the time of described wireless universal packet service tunnel protocol-protocol data unit message on the described timestamp of the described block data protocol context of correspondence;
When B receives from the mistake of described purpose wireless universal packet service support node indication message when described source wireless universal packet service support node, judge this mistake indication message correspondence block data protocol context described timestamp item time with receive this mistake and indicate time difference between the time of message, whether less than the threshold value that sets in advance, if, then carry out normal process, otherwise, abandon this mistake indication message.
2. wrong indication message processing method according to claim 1, it is characterized in that, among the described step B, when the time of the described timestamp item of the block data protocol context of decision error indication message correspondence and time difference between the time that receives this mistake indication message are not less than the threshold value that sets in advance, also comprise this wrong step of indicating the daily record of packet loss logout.
3. a wrong indication message processing method is characterized in that, comprises following steps:
When A creates each local wireless access bearer context at source radio network controller, joining day is stabbed item in this context, and at every turn after the purpose radio network controller sends wireless universal packet service tunnel protocol-protocol data unit message, record sends the time of described wireless universal packet service tunnel protocol-protocol data unit message on the contextual described timestamp of the described RAB of correspondence;
When B receives from the mistake of described purpose radio network controller indication message when described source radio network controller, judge this mistake indication message correspondence the contextual described timestamp item of RAB time with receive this mistake and indicate time difference between the time of message, whether less than the threshold value that sets in advance, if, then carry out normal process, otherwise, abandon this mistake indication message.
4. wrong indication message processing method according to claim 3, it is characterized in that, among the described step B, when the time of the contextual described timestamp item of RAB of decision error indication message correspondence and time difference between the time that receives this mistake indication message are not less than the threshold value that sets in advance, also comprise this wrong step of indicating the daily record of packet loss logout.
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