CN100499645C - Method for managing interface connection between wireless access network and kernel network on ground - Google Patents

Abstract

The disclosed method includes steps: (1) ASGSN determines whether message of session management from mobile station is an expected type of message; if no, entering into step (2); (2) determining whether it is possible to locate PDP context based on value of transaction identifier carried by message of session management; if no, entering into step (3); (3) determining whether mobile station is using lu connection; if no, releasing lu connection. The invention monitors lu connection under abnormal condition, prevents lu connection from hanging up as well as monitors use of lu connection resources in order to raise service efficiency of lu resources.

Description

The management method that interface is connected between grounding wireless access network and the core net

Technical field

The present invention relates to the management method that the universal mobile telecommunications system interface connects, particularly Serving GPRS Support Node is to the management method of Iu connection.

Background technology

GPRS (General Packet Radio Service is called for short " GPRS ") network is a kind of cellular mobile communication networks of new generation based on global mobile system (Global System of Mobility is called for short " GSM ") network.In order to support the GPRS function, in existing GSM network, need to increase some nodes, as Gateway GPRS Support Node (Gateway GPRS SupportNode, abbreviation " GGSN "), Serving GPRS Support Node (Serving GPRS Support Node, be called for short " SGSN "), they all belong to GPRS Support Node (GPRS Support Node is called for short " GSN ").In addition, at 3G (Third Generation) Moblie (The Third Generation, be called for short " 3G ") universal mobile telecommunications system (Universal Mobile Telecommunications System, abbreviation " UMTS ") in the core net, also support the GPRS function, GSN nodes such as GGSN and SGSN are arranged equally.

GSN is a most important network node in the GPRS network, has mobile routing management function, can connect various types of data networks, and can be connected to the GPRS register, and the data that can finish between travelling carriage and the various data network transmit and format conversion.Wherein the main effect of SGSN is the current location information of record travelling carriage, and finishes the transmission and the reception of mobile packet data between travelling carriage and GGSN.GGSN mainly plays the gateway effect, and it can be connected with multiple different data network, as ISDN(Integrated Service Digital Network), Ethernet etc.

And UMTS can be divided into wireless access network (UMTS terrestrial radio access network, be called for short " UTRAN ") and core net (core network, be called for short " CN ") two parts, the two connects by universal mobile telecommunications system interface (Interface of UMTS is called for short " Iu ").UMTS terrestrial wireless interface adopts and to be different from present gsm wireless interfacing fully, uses new frequency range, new Radio Transmission Technology and speech coding form, and the bandwidth up to 2,000,000 can be provided.The UMTS core net is the all-IP backbone network that grows up on the GSM/GPRS basis.From being divided into circuit commutative field (Circuits Switch is called for short " CS ") and packet-switched domain (Packet Switch is called for short " PS ") in logic.The CS territory is the circuit switched core network of UMTS, is used for support circuitry data services, and capital equipment is mobile switching centre's (Mobile Switch Center is called for short " MSC "), realizes the speech business exchange; The PS territory is the Packet Service core net of UMTS, is used to support GPRS and some multimedia services, capital equipment SGSN, GGSN and charging gateway (Charging Gateway is called for short " CG ") etc.In UMTS, transmit orders to control with transfer of data and separate.

UTRAN basic functions entity is B node (Node B) and radio network controller (RadioNetwork Controller is called for short " RNC ").Wherein, the B node is equivalent to the base station receiving platform of GSM, and RNC is equivalent to the base station control station of GSM.

RNC is connected with Iub interface by Iu respectively with the B node with CN, and different RNCs is linked to each other by the Iur interface.Iur relates to soft switch and the position is upgraded.RNC inside, Iub, Iu interface adopt Asynchronous Transfer Mode (Asynchronous Transfer Mode is called for short " ATM ") exchange, transmission usually.Because on the basis of existing gprs system, do for the 3G wireless access and to redeploy investment and the time that to expend, simultaneously for existing Internet resources are utilized, both economical reliable method is to make the GPRS core net support GPRS and two kinds of access waies of UMTS simultaneously, at first introduce UTRAN in the busy area of data service, the GPRS base station sub-system is still kept in the place that traffic carrying capacity is few.

Fig. 1 shows the system configuration of GPRS/UMTS network.Wherein link to each other by Gs interface and mobile switching center (MSC/Visit Location Register is called for short " MSC/VLR ") with SGSN in the core net; Interconnect by Gp between the SGSN in the different Public Land Mobile Nerwork (Public Land Mobile Network is called for short " PLMN "); SGSN links to each other by Lg interface and critical point mobile location centre Chinese (Gateway Mobile Location Center is called for short " GMLC "); SGSN is by Ge interface and service control point (Service Control Point is called for short " SCP "); SGSN links to each other by Gd interface and short message service center's (Short Message Center is called for short " SMC "); SGSN is by Gr interface and attaching position register/AUC's (Home LocationRegister/Authentication Center is called for short " HLR/AUC "); SGSN links to each other with GGSN by gn interface, and GGSN then connects by Gi interface and public data network (Public Data Network is called for short " PDN "); SGSN all links to each other with CG by the Ga interface with GGSN.Interface between GSM base station sub-system (Base Station Subsystem is called for short " BSS ") and the core net is a Gb Interface in addition, and directly the equipment that links to each other is exactly SGSN; Interface between UTRAN and the core net is the Iu interface, because SGSN belongs to the PS territory, and the interface between the SGSN is an Iu-PS interface.Travelling carriage (Mobile Station is called for short " MS ") or subscriber equipment (User Equipment is called for short " UE ") by BSS or UTRAN wireless access, use the Uu interface.SGSN finishes the route and the functions such as forwarding, encryption and authentication, session management, mobile management, Logical Link Management, ticket generation and output of packet data package in network, be in core position.

According to the servicing property difference is provided, CN comprises CS territory, PS territory, broadcasting (Broadcast is called for short " BC ") territory.The professional front in CS territory and PS territory is addressed, and the BC territory provides the broadcast type business.Because UTRAN is different with the territory that CN connects,, be called Iu-CS, Iu-PS, Iu-BC Interface so corresponding Iu interface is also different.Fig. 2 shows the basic structure of Iu interface.UTRAN comprises a plurality of RNC, and each RNC hangs a plurality of Node B down, and RNC connects by corresponding Iu interface with each territory of CN again, and Node B then carries out radio communication with UE.

In numerous interfaces, the Iu interface comprises: Iu-CS, RNC are to the circuit domain interface of MSC, and interface type mainly is a carrying ATM cell (STM-1/STM-4); Iu-PS, RNC are to the packet domain interface of SGSN, and interface type mainly is a carrying ATM cell (STM-1/STM-4); Iub, NodeB are to the interface of RNC, and interface type comprises inverse multiplexing interface (IMA), carrying ATM cell (STM-1) two kinds; Iur, the interface between the RNC, interface type comprise carrying ATM cell (STM-1/STM-4), inverse multiplexing interface (IMA); Iu-BC, different with Iu-CS, Iu-PS is that Iu-BC can connect a plurality of RNC, implements broadcasting service.Other interface is called G interface, belong to interface comparatively less important in the 3G network, comprise: the multiple interconnect interface between the equipment such as MSC, SGSN, VLR, HLR, AUC, GGSN, interface type comprise STM-1/STM-4 (carrying ATM, TDM), FE/GE, E1 etc.

The Iu interface accounts for critical role in the 3G network system, its major function comprises: RAB (Radio Access Bearer, be called for short " RAB ") management function, radio resource management function, rate adaptation function, Iu connection management function, Iu interface user plane management function, mobile management function, security management function, business and network access facility, Iu coordination function etc.

According to the standard that third generation partner program (3rd Generation Partnership Project is called for short " 3GPP ") is worked out, Fig. 3 shows Iu-PS protocol architecture model.This structure comprises wireless network layer (Radio Network Layer), transport network layer (Trsanport Network Layer) and physical layer (Physical Layer) according to interlayer and the separate principle of interplanar and set up.The function relevant with UTRAN is only relevant with wireless network layer, the wireless network layer of Iu interface all adopts wireless access network application protocol (Radio Access Network Application Protocol, be called for short " RANAP "), it is responsible for the Signalling exchange between CN and the RNC; Transport network layer is that UTRAN adopts standardized transmission technology, all uses the ATM transmission technology; Physical layer can be multiple standards interfaces such as STM-1.Application protocol is set up carrying at wireless network layer, and (Operation andMaintenance is called for short " O﹠amp to signaling bear by Operation and Maintenance; M ") set up.User plane (User Plane) comprises data flow and is used for the Data-carrying of transmitting data stream that data flow is the Frame Protocol of each interface regulation.

In the various basic processes of RANAP layer, reset (Reset), resetting resource (Reset Resource), flow control (Overload Control), paging (Paging) adopts SCCP (Signaling Connection Control Part is called for short " SCCP ") connectionless service to transmit; Mistake indication (Error Indication) is adopted connectionless service or connection-oriented service by the concrete condition decision; Other flow process adopts connection-oriented service.Connection-oriented message all is particular UE and internetwork message, as the position of UE new technological process more, and call flow etc., such connection is called the universal mobile telecommunications system interface and connects, and promptly Iu connects.

Each Iu connects the relevant Iu resource that is taking UTRAN, comprises RAB, signaling connection (Signalling Connection) etc.After an Iu connection was set up, RNC had the right to discharge in appropriate circumstances Iu with SGSN and is connected, and promptly discharged this Iu and connected the Iu resource that takies, thereby guarantee the repetition availability of relevant Iu resource.Such process is called Iu and discharges.RNC discharges to CN request and is connected with the Iu of particular UE, generally is that the reason owing to UTRAN causes, as " operation user intervention ", " user is stopped ", " RNC and being connected of UE lose " etc.CN also can initiate Iu to RNC and discharge under situations such as UE and the direct affairs end of CN, the end of reorientation flow process.

Because the Iu resource belongs to bottleneck in whole 3G network, how effectively managing I u resource improves its utilance, is an important problem.

Stipulate in the 3GPP TR24.008 standard: remove " ACTIVATEPDP CONTEXT REQUEST " (activation packet data protocol context request) when what SGSN received that MS sends, " ACTIVATESECONDARY PDP CONTEXT REQUEST " (activating the secondary packet data protocol context request), or the layer outside " SM-STATUS " (session management state) is gone up session management (SessionManagement, abbreviation " SM ") after the message, if can't be according to transaction flag (TransactionIdentifier, be called for short " Ti ") find packet data protocol (the Packet DataProtocol of the activation of a correspondence, be called for short " PDP ") context, or PDP Context that is in activation or the deactivation process, then SGSN should return " SM-STATUS " message that a cause value is 81 (invalid transactionidentifier value) to MS, points out invalid Ti value; In addition, after MS is subjected to " SM-STATUS " message from SGSN, can only carry out local operation, and should not notify wave point (comprising the Iu interface) to operate.

Except ACTIVATE PDP CONTEXT REQUEST, ACTIVATE SECONDARYPDP CONTEXT REQUEST and SM-STATUS message, when MS sends to the SGSN session management messages, no matter whether this PDP Context exists among the SGSN, the capital has an Iu connection to be established, connect by this Iu, this session management messages is delivered to SGSN.If SGSN can't find the PDP Context of an activation according to Ti, one be in activate or deactivation process in PDP Context, will return " SM-STATUS " message to MS, make the PDP Context among MS and the SGSN be consistent, if at this moment do not had PDP Context or location service (LoCation Service among the MS, be called for short " LCS "), short message service (Short MessageService, abbreviation " SMS ") flow process is using this Iu to connect, this Iu connects and can't be released so, takies the Iu resource in RNC always.This Iu connects the situation that can't discharge and is called the Iu connection by extension extremely.

Similar above-described abnormal conditions are not handled in the Iu connection management scheme at present specially, Iu are not connected yet and carry out the monitoring of utilization of resources situation.

In actual applications, when such scheme exists following problem: Iu connection quilt extension dead, continue not have signaling and transfer of data on the Iu interface for a long time, Iu connects and still can keep, and network side does not have the mechanism assurance, and it is released, and causes waste of radio resources.Under normal circumstances,, the situation of signaling and transfer of data also may occur not having for a long time on the Iu interface,, be unfavorable for the utilization of resources, can influence system effectiveness when it is but taking the Iu resource because communication service is inharmonious.

Cause the main cause of this situation to be, Iu is connected in the Managed Solution that Iu connects and hang dead abnormal conditions and do not handle and discharge.

Summary of the invention

The technical problem to be solved in the present invention provides the management method that interface is connected between a kind of grounding wireless access network and the core net, making that Iu connects under the abnormal conditions obtains monitoring, it is dead to prevent that Iu from connecting by extension, sets up the monitoring that the Iu connection resource is utilized simultaneously, improves the Iu resource utilization.

In order to solve the problems of the technologies described above, the invention provides the management method that interface is connected between a kind of grounding wireless access network and the core net, comprise following steps:

The GPRS serving GPRS support node of the described grounding wireless access network of A judges whether the session management messages from travelling carriage is the type of message of expection, if not then entering step B;

B judges whether and can navigate to block data protocol context according to the value of the entrained Transaction Identifier of described session management messages, if not then entering step C;

C judges whether described travelling carriage is using described interface to connect, and connects if not then discharging described interface.

Wherein, the type of message of described expection comprises the activation packet data protocol context request message or activates secondary packet data protocol context request message or session management status message or their combination in any.

Described block data protocol context is the block data protocol context that activates, and perhaps is in the block data protocol context in activation or the deactivation process.

Described step C comprises following substep:

Judge that whether described travelling carriage also has other block data protocol context or location service flow process or short message service flow process using described interface to connect, and connects if not then discharging described interface.

The described interface step of connecting of described release comprises following substep:

Described GPRS serving GPRS support node sends interface release command message between grounding wireless access network and the core net to the radio network controller of described grounding wireless access network;

Described radio network controller responds described release command message, discharges described interface and connects.

Described step C also further comprises following substep:

Described GPRS serving GPRS support node is 81 session management status message to described travelling carriage transmission cause value.

Wherein, the management method that interface is connected between grounding wireless access network and the core net further comprises following steps:

Interface between described grounding wireless access network and the core net is intercepted;

Judgement is in one section preset time, and whether the signaling plane of transfer of data and described interface on do not have signaling transmission, connect if then discharge described interface if not having on the data surface of described interface.

Wherein, described intercepting by the GPRS serving GPRS support node of described grounding wireless access network implemented.

By relatively finding, technical scheme difference with the prior art of the present invention is, when SGSN finds that the session management messages from MS is outlier, according to Ti value location PDP Context, if do not navigate to, and do not have PDP Context or LCS flow process or SMS flow process using this flow process, then discharge this Iu and connect.In addition, can also intercept, in time discharge and hang dead Iu connection or idle Iu connection the Iu interface.

Difference on this technical scheme has brought comparatively significantly beneficial effect, has promptly avoided effectively connecting the situation that extremely causes the wasting of resources of being hung by Iu under the inconsistent abnormal conditions that cause of PDP Context; Prevented that Iu connects the long-time idle situation of Iu connection under dead or the normal condition of being hung under other abnormal conditions, in time discharging these Iu connects, but guarantee the reuse of Iu resource, improve the service efficiency of Iu resource, improve the efficient and the performance of mobile communications network.

Description of drawings

Fig. 1 is the GPRS/UMTS schematic network structure;

Fig. 2 is an Iu interface structure schematic diagram;

Fig. 3 is an Iu-PS interface protocol architecture model schematic diagram;

Fig. 4 is that Iu according to an embodiment of the invention connects abnormal conditions guard method flow chart.

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 present invention is directed to previously described abnormal conditions and propose corresponding monitoring method, guarantee that the Iu connection in time obtains discharging when abnormal conditions occur, prevent that Iu from connecting quilt and hanging extremely.

The front is addressed, and can be two kinds of situations to the release of Iu, is a kind ofly initiated by CN side apparatus such as SGSN, and another kind is that RNC initiates.The present invention at first monitors the abnormal conditions in the Iu connection, if abnormal conditions take place, then notifies CN side apparatus or RNC to discharge this Iu and connects.

In a preferred embodiment of the present invention, the protection flow process that Iu connects abnormal conditions is set in SGSN, the message that MS sends is monitored, judge that Iu connects the generation of abnormal conditions, and under abnormal conditions, use Iu connection release command to discharge this connection.Below with reference to Fig. 4 the concrete steps of this flow process are described in detail.

At first in step 401, receive session management messages according to SGSN from MS, judge whether this message is to activate packet data protocol context request (ACTIVATE PDP CONTEXTREQUEST, abbreviation " APCR "), activate secondary packet data protocol context request (ACTIVATESECONDARY PDP CONTEXT REQUEST, abbreviation " ASPCR "), session management state (SM-STATUS, one of be called for short " SS "), if, then get rid of the possibility that abnormal conditions occur, end process is not carried out this flow process; Otherwise, need follow the tracks of this message, enter step 402.This step has embodied trigger flow mechanism.

In step 402, judge whether the Ti value that this message is carried can navigate to corresponding PDP Context, if then get rid of the possibility that abnormal conditions occur, process ends; Otherwise entering step 403 continues to follow the tracks of.

In step 403, send the SM-STATUS message that cause value is 81 expression invalidation transactions ident values (invalidtransaction identifier value) to MS, enter step 404 then.This step is the agreement regulation.

In step 404, according to agreement at this moment system should to send cause value be that " SM-STATUS " message of 81 is to MS, at this moment this flow process is carried out to judge: judge under this MS that the PDP Context that whether also has other or LCS flow process or SMS flow process using this Iu to connect, if, then get rid of the possibility that abnormal conditions occur, process ends; Otherwise the specification exception situation takes place, enters step 405 and carries out abnormality processing.

In step 405, SGSN sends Iu interface release command message (IU RELEASECOMMAND is called for short " IRC ") to RNC, discharges this Iu and connects, and finishes this flow process then.

Protectiveness flow process described above is in one embodiment of the invention based on the measure of SGSN; flow process triggers according to the SM message that by abnormal conditions triggering reason is MS; and the process of this message of tracking SGSN system handles; judge the appearance of abnormal conditions; finally it is handled, it is dead to prevent that Iu from connecting by extension.

In another embodiment of the present invention, protection Iu connects and the function that improves its utilance also can be finished by MS and RNC.The RRC resource of being responsible under abnormal conditions by MS discharges and protection, by release and the protection of RNC according to the operating position decision Iu connection of RRC resource.

In actual operating environment, except above-mentioned abnormal conditions, also may be because the problem or the communicating pair flow process coordination problem of network service cause the Iu connection unusual or long-time idle; In addition under normal circumstances, free of data and signaling transmission for a long time on the Iu interface, but taking valuable Iu resource, cause the wasting of resources.If these Iu resources are discharged, can need use the MS of Iu resource for other, will improve the service efficiency that Iu connects greatly.At these situations; in one embodiment of the invention; except the protectiveness of unusual flow process being carried out the Iu connection is handled; also the Iu interface is intercepted; if in one section preset time length, do not have transfer of data on the data surface, and there is not the signaling transmission on the signaling plane; then discharge Iu and connect, delivery mode can be initiatively to be finished to RNC transmission " IU RELEASE COMMAND " message or by the co-ordination between MS and the RNC by SGSN.Take this widely the purpose of protective measure be, can discharge on the one hand that the dead Iu of extensions connects under other unpredictable abnormal conditions, also can carry out certain raising on the other hand to the utilance of Iu connection under the normal condition.

After Iu in these cases connects protected flow process or monitors flow process release; when MS or network side have data or signaling to transmit; the reconstruction flow process that Iu connects can be initiated in both sides, Iu is connected rebulid the transmission of go forward side by side line data or signaling.Guaranteed that like this Iu has data or signaling transmitting when being connected operation, prevented the waste of Iu resource.

Those of ordinary skill in the art are appreciated that, realize tracking and the judgment mode under abnormal conditions or the normal condition and carry out mode that Iu is connected release and can select mode and the equipment that to realize as the case may be, and do not influence the spirit and scope of the invention.

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 (7)

1. the management method that interface is connected between a grounding wireless access network and the core net is characterized in that, comprises following steps:

The GPRS serving GPRS support node of the described grounding wireless access network of A judges whether the session management messages from travelling carriage is the type of message of expection, if not then entering step B;

B judges whether and can navigate to block data protocol context according to the value of the entrained Transaction Identifier of described session management messages, if not then entering step C;

C judges whether described travelling carriage is using described interface to connect, and connects if not then discharging described interface;

Wherein, the type of message of described expection comprises the activation packet data protocol context request message or activates secondary packet data protocol context request message or session management status message or their combination in any.

2. the management method that interface is connected between grounding wireless access network according to claim 1 and the core net, it is characterized in that, described block data protocol context is the block data protocol context that activates, and perhaps is in the block data protocol context in activation or the deactivation process.

3. the management method that interface is connected between grounding wireless access network according to claim 1 and the core net is characterized in that described step C comprises following substep:

Judge that whether described travelling carriage also has other block data protocol context or location service flow process or short message service flow process using described interface to connect, and connects if not then discharging described interface.

4. the management method that interface is connected between grounding wireless access network according to claim 1 and the core net is characterized in that the described interface step of connecting of described release comprises following substep:

Described GPRS serving GPRS support node sends interface release command message between grounding wireless access network and the core net to the radio network controller of described grounding wireless access network;

Described radio network controller responds described release command message, discharges described interface and connects.

5. the management method that interface is connected between grounding wireless access network according to claim 1 and the core net is characterized in that described step C also further comprises following substep:

Described GPRS serving GPRS support node is 81 session management status message to described travelling carriage transmission cause value.

6. the management method that interface is connected between grounding wireless access network according to claim 1 and the core net is characterized in that, further comprises following steps:

Interface between described grounding wireless access network and the core net is intercepted;

Judgement is in one section preset time, and whether the signaling plane of transfer of data and described interface on do not have signaling transmission, connect if then discharge described interface if not having on the data surface of described interface.

7. the management method that interface is connected between grounding wireless access network according to claim 6 and the core net is characterized in that, described intercepting by the GPRS serving GPRS support node of described grounding wireless access network implemented.

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