CN101001184A

CN101001184A - Method for accessing group data network

Info

Publication number: CN101001184A
Application number: CN 200610005305
Authority: CN
Inventors: 周四红; 张文林; 刘岚; 胡伟华
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2006-01-09
Filing date: 2006-01-09
Publication date: 2007-07-18

Abstract

This invention discloses a method for accessing packet data network (PDN), and a MS accesses packet data network by playing the core net of the network and the method includes: an access net selects CN-node for the MS and adheres it, the CN-node judges if needing transferring said MS according to its property, if not, said MS adheres itself on the CN-node and accesses the packet data net to finish the flow, if so, the CN-node determines a target CN-node and transfers the MS adhere to the target CN-node to access the packet data network by the target CN-node.

Description

A kind of method of accessing group data network

Technical field

The present invention relates to the mobile communications network access technology, refer to the method for a kind of travelling carriage (MS) especially by evolvement network (Evolved Network) accessing group data network (PDN, Packet Data Network).

Background technology

Universal mobile telecommunications system (UMTS) is a kind of third generation cordless communication network technical standard of third generation partner program (3GPP) tissue definition, and this standard has been issued REL-99, REL-4, REL-5 and REL-6 version.Fig. 1 is the schematic network structure of prior art UMTS, and as shown in Figure 1, the UMTS network is made up of core net (Core Network) and UTMS land radio access web (UTRAN, UMTSTerrestrial Radio Access Network).Core net comprises circuit domain (CS, CircuitSwitch) and two parts of packet domain (PS, Packet Switch), wherein, circuit domain provides based on Circuit-switched business such as speech business, and packet domain provides business such as internet (Internet) visit based on packet switching.The terminal that the user uses in the UMTS network as subscriber equipment (UE, UserEquipment).

As shown in Figure 1, because this paper only relates to the packet domain part, so the circuit domain part is not shown in Figure 1 in the core net, and core net is made up of Serving GPRS Support Node (SGSN), Gateway GPRS Support Node (GGSN) and attaching position register (HLR); Access Network is made up of radio network controller (RNC) and base station node B.Each RNC can connect some NodeB, and each SGSN can connect some RNC.Be to be to be to be to be the Gi interface between the PDN for Gc interface, GGSN and outside between Gr interface, GGSN and the HLR between Gn/Gp interface, SGSN and the HLR between Iu-PS interface, SGSN and the GGSN between Iub interface, RNC and the SGSN between NodeB and the RNC, PDN is meant the general name of all packet data network herein, and it can be Internet network or enterprise network or the like.Wherein, a Gr interface and a Gc interface signaling message transmission, Gr interface and Gc interface do not have user's business datum; The Iu interface is the key interface of Access Network and core net, and the management of Radio Resource and control are isolated in the Access Network by the Iu interface, makes core net that professional providing only is provided.The UMTS network support IP of REL-5 version transmission, Iu, Iur and Iub interface can adopt the IP transmission technology, can adopt the IP bearer network that the transmission of signaling and business datum, the interconnection that can set up multi-to-multi between RNC and the SGSN are provided between NodeB, RNC, the SGSN.

At present, 3GPP is studying the next generation network after the evolution of UMTS network, and formulates the technical standard of evolvement network, the next generation network after the evolution of UMTS network is abbreviated as evolvement network (Evolved Network) herein.Evolvement network has a lot of new characteristics, such as: evolvement network only provides the packet-type business, and real time business such as voice, visual telephone also will provide in the mode of grouping; Realize complete IP network, each node device interconnects by IP network in the evolvement network, and each travelling carriage adheres to distributing IP address, back; Evolvement network support and the UMTS network between switching and roaming, for real time business, the time of switching between system is no more than 300 milliseconds, for non-real-time service, the time of switching between system is no more than 500 milliseconds or the like.

Fig. 2 is the schematic network structure of evolvement network, as shown in Figure 2, evolvement network comprises evolution block core net (Evolved Packet Core) and the evolution wireless access network of being made up of as evolution base station (E-NodeB) some wireless access network nodes (RAN-Node, RadioAccess Network Node) (Evolved-RAN).RAN-Node in the evolvement network also realizes the function of layer 2 protocol and layer 3 agreement except the physical channel of realizing physical layer.Interface between evolution wireless access network and the evolution block core net is called the S1 interface for the time being, and evolvement network inserts outside PDN by the Gi interface.Evolution block core net is made up of some core net nodes (CN-Node), the role of SGSN and GGSN in the similar UMTS network of CN-Node, realize the function of all core net, for example to temporary mark, the distributing IP address of user's mobile management and session management, distributing user, be provided to the access of outside PDN etc.Adopt the S2 interface to connect between the CN-Node, adopt the interconnection of IP bearer network between RAN-Node and the CN-Node, RAN-Node and CN-Node can set up the multi-to-multi interconnected relationship.The terminal that the user uses in the evolvement network is the general name of all mobile subscriber equipments as travelling carriage (MS, Mobile Station).

Need to prove, in the middle of the technical standard of evolvement network is being formulated, the internal structure of evolution wireless access network and evolution block core net is also undefined, S1 interface and S2 interface are represented just exists a kind of interface relationship, and the actual name of interface is finally determined by the technical standard that 3GPP formulates.

No matter be in existing ripe UMTS network, still in being about to the evolvement network of releasing, an important feature of mobile communication system, exactly the mobile subscriber is carried out mobile management, its objective is the position that makes network can in time know the mobile subscriber place, when downlink business, network can be set up with the mobile subscriber and communicate by letter.

In the UTMS network, in order to realize mobile management, the UMTS network is divided into different routes district (RA, Routing Area), and each RA is identified by unique Routing Area Identifier (RAI, Routing AreaIdentity).After user's start, UE at first carries out network attachment, is attached in the network at current place, is attached to local network such as the local user, and the roamer is attached to the roaming place network, so that the business that the user can use network to provide.When UE when a route district moves to another route district, UE carries out route district (RA) and upgrades, and upgrades the latest position of UE in network.In addition, UE also can periodically carry out Routing Area Update under idle condition, and the cycle of renewal is specified by SGSN.

Usually, different SGSN manage different route districts.Change has also taken place as if SGSN in the change of route district in UE in moving process, to carry out switching flow between the SGSN and between SGSN and the HLR, with the communication context information transfer of UE in former SGSN in new SGSN, if UE is using business, need to set up data link between the SGSN.Switch for reducing between this SGSN, 3GPP standard TS23.236 has proposed the notion of pool area (Pool-Area), that is: a pool area is formed in the zone that some RNC are covered, such as with the overlay area in a city as a pool area, in this pool area, always provide service for UE by a SGSN.Like this, in pool area, even the route district changes, the SGSN that serves for the user remains unchanged, thereby has avoided largely switching between SGSN.

Generally, a pool area provides service concurrently by several SGSN, and these SGSN form a SGSN pond.In the SGSN pond, each SGSN distributes one or several network resource identifiers (NRI, Network Resource Identity), and by Operation and Maintenance NRI and the affiliated SGSN that distributes is configured among each SGSN accordingly.When SGSN is UE allocation packets Temporary Mobile Subscriber Identity (P-TMSI) at every turn, in P-TMSI, carry the NRI of this SGSN, NRI is 0～10Bits variable-length, be positioned at the 14th to 23 of P-TMSI (Bit23～Bit14), the length of its actual significant bit of NRI among the P-TMSI depends on the network planning and can control (OMC) configuration by attended operation.Among the RNC, dispose the corresponding relation of all SGSN in the SGSN pond and separately NRI; In the SGSN pond, each SGSN also disposes the NRI of other SGSN and the corresponding relation of affiliated SGSN.

Carry out when adhering to when the user enters pool area for the first time, the routing iinformation that RNC provides according to UE is selected a SGSN in the SGSN pond be that UE adheres to.In case UE adheres in pool area successfully, selected SGSN is that UE distributes P-TMSI, has pointed out the NRI of this SGSN among the P-TMSI.Hereafter, as long as UE does not leave pool area, RNC can provide service for UE selects identical SGSN for UE according to NRI.Like this, in pool area, UE uses same SGSN all the time.

The mobile management solution that provides according to 3GPP standard TS23.236, after user's start, UE carry out adhere to, when Routing Area Update or Packet Service activate, setting up UE earlier is connected with the Radio Resource control (RRC) of RNC, to adhere to Non-Access Stratum (NAS such as request, Routing Area Update request, Non AccessStratum) message is as Non-Access Stratum protocol Data Unit (NAS-PDU, NAS Protocol DataUint) data, initial directly the transmission in (Initial Direct Transfer) message that is carried at RRC sends to RNC; RNC selects SGSN according to the routing iinformation that carries in this message, and NAS message is routed to selected SGSN.Here, routing iinformation is derived out by IMSI International Mobile Subscriber Identity (IMSI) or P-TMSI, if UE uses IMSI as user ID, then routing iinformation is the V value, and this V value equals [(IMSI Div 10) Mod 1000]; If UE uses P-TMSI as user ID, then routing iinformation is the NRI that carries among the P-TMSI.

After chosen SGSN receives and adheres to request or Routing Area Update request message, if this SGSN load is overweight or just preparing to carry out reboot operation, this SGSN accepts to adhere to request and routing update request, but this SGSN is UE distributes a P-TMSI who carries sky NRI (Null NRI), SGSN specifies a very short cycle routing update timer of time simultaneously, and returns to UE; The packet call of this SGSN to receiving carried out normal handling, accepts the call request of UE.Here, Null NRI is unique, special NRI default in the SGSN pond, is used for transshipping at the current SGSN that adheres to of routing update indication UE.

UE finish adhere to or Routing Area Update after, if current do not have a service call, then discharge with all of network and be connected, enter Idle state, the timer of UE start-up control cycle routing update.When the timer expiry of cycle routing update, UE initiates routing update, at this moment, because the NRI among the P-TMSI is NullNRI, the SGSN that RNC is known adhered to originally transships, and RNC is that UE selects new SGSN, and the Routing Area Update request message is routed to new SGSN.Follow-uply will carry out normal routing update flow process, finish routing update after, UE is attached among the new SGSN, has realized the transfer from former SGSN to new SGSN.

In the UMTS network, a lot of GGSN are arranged in the packet-based core networks, different GGSN can provide different business.Therefore, stipulate according to agreement, setting up Packet Service needs to activate packet data protocol (PDP) context before, sets up from UE to the route the selected GGSN, carry out the two-way transmission of user service data by this route, for the roamer, the business that activates both can insert PDN from the GGSN of visited network, also can insert PDN from the GGSN of home network, depended on the agreement of reaching between home network operator and the visited network operator.

Because user's business datum must insert PDN through GGSN, and different GGSN can provide different business, in order to make SGSN can be the correct GGSN of service selection that activates, in user's subscription data, operator has specified APN (APN for the user, and be stored among UE and the HLR Access Point Name).A user can have several APN, depends on user's subscription data.Activate in the PDP process, SGSN obtains APN information from UE or HLR, SGSN carries out obtaining the GGSN address after domain name system (DNS) is resolved to APN, such as, when the local user activates Packet Service, the GGSN address that SGSN parsing APN obtains is positioned at local network, and then UE is from the GGSN access external data net of accompanying SGSN through this locality; When the roamer activated Packet Service, if the GGSN address that SGSN parsing APN obtains is positioned at the roaming place, then UE was from the GGSN access external data net of accompanying SGSN through the roaming place; When the roamer activated Packet Service, if the GGSN address that SGSN parsing APN obtains is positioned at ownership place, then UE arrived homing GGSN from accompanying SGSN by the GPRS backbone network, and through homing GGSN access external data net.

Fig. 3 selects GGSN to insert the schematic diagram of PDN by APN among the prior art UMTS, as shown in Figure 3, supposes that UE1 is the local user, and UE2 and UE3 are the roamers; The APN of UE2 points to the GGSN of roaming place, and the APN of UE3 points to the GGSN of ownership place, and each UE realizes that the routed path of Packet Service can be:

UE1 is positioned at local network, and SGSN resolves the GGSN address that obtains by APN and also is positioned at local network, so routed path is: the local GGSN-PDN of the local SGSN-of UE-NodeB-RNC-, shown in thick chain-dotted line among Fig. 3;

UE2 is positioned at the roaming place network, and roaming place SGSN resolves the GGSN address that obtains by APN and also is positioned at the roaming place, so routed path is: SGSN-roaming place, UE-NodeB-RNC-roaming place GGSN-PDN, shown in thick dashed line among Fig. 3;

UE3 is positioned at the roaming place network, and roaming place SGSN resolves the GGSN address that obtains by APN and is positioned at ownership place, so routed path is: UE-NodeB-RNC-roaming place SGSN-GPRS backbone network-homing GGSN-PDN, and shown in heavy line among Fig. 3.

Similar with the mobile management of above-mentioned UMTS network, in evolvement network, network coverage area is divided into different tracking area (TA, Tracking Area), the notion of tracking area and route district are similar, each tracking area is identified by unique tracking area identification (TAI, Tracking Area Identity).When MS when a tracking area moves to another tracking area, MS carries out tracing section updating, purpose is to upgrade the TAI of current MS place tracking area in CN-Node.In addition, MS also can periodically carry out tracing section updating, and specified by CN-Node the cycle time of renewal.In addition, similar with the SGSN pool concept, the notion in CN-Node pond is also proposed in evolvement network, in the CN-Node pond, each CN-Node distributes one or several NRI, in RAN-Node, disposes the corresponding relation of all CN-Node in the CN-Node pond and separately NRI; In the CN-Node pond, each CN-Node also disposes the NRI of other CN-Node and the corresponding relation of affiliated CN-Node.

At present, 3GPP clearly proposes, and will continue to support many APN business in evolvement network, still, does not provide specific implementation.

Compare with the UMTS network, the core net of evolvement network no longer includes SGSN and two kinds of nodes of GGSN, and has only CN-Node node such as Access Network-core net gateway (ACGW).If in evolvement network, continue to prolong with the technical scheme among the UMTS and realize that user terminal passes through the evolvement network core net and inserts PDN, so when existing many APN professional, when activating Packet Service at every turn, CN-Node carries out dns resolution to obtain a CN-Node address according to APN, this CN-Node is the CN-Node that access PDN is provided for the Packet Service of this activation, is called border CN-Node herein.For the local user, outlet CN-Node is usually just in this locality; For the roamer, outlet CN-Node may be in the roaming place or ownership place.When outlet CN-Node just in this CN-Node pond, but be not the current CN-Node that adheres to of MS, the data of the Packet Service of activation this moment must just can reach the external packet data net through two CN-Node.

With CN-Node is that ACGW is an example, and Fig. 4 prolongs the schematic diagram of selecting ACGW access PDN with the method among the UMTS in the evolvement network, as shown in Figure 4, suppose that MS is positioned at roaming network, the MS of roaming supports two kinds of APN professional as professional A and professional B, professional A corresponding A PN1, professional B corresponding A PN2; Roaming network has used pool area, and promptly ACGW1...ACGWn forms an ACGW pond.When the user moves to the pool area of roaming network, suppose that ACGWn is selected as the user service is provided, so MS is attached among the ACGWn, shown in thick dashed line among Fig. 4.

Suppose that professional B is the enterprise network of company under the calling party, as shown in Figure 4, when user's activating service B, ACGWn obtains exporting the address that ACGW is ACGWq by resolving APN2, ACGWq is positioned at home network, therefore the business datum routed path of professional B is: MS-E-NodeB-ACGWn-backbone network-ACGWq-PDN, and shown in thick chain-dotted line among the figure.Here, ACGWn is equivalent to SGSN, and ACGWq is equivalent to GGSN.

Suppose that professional A is for being provided Internet visit by the roaming place, as shown in Figure 4, when user's activating service A, ACGWn obtains exporting the address that ACGW is ACGW1 by resolving APN1, ACGW1 is positioned at this pond, therefore the business datum routed path of professional A is: MS-E-NodeB-ACGWn-ACGW1-PDN, and shown in heavy line among Fig. 4.Here ACGWn is equivalent to SGSN, and ACGW1 is equivalent to GGSN.

From evolvement network shown in Figure 4, insert the method for PDN, all need through inserting PDN behind two ACGW nodes for the grouped data of professional A or professional B.Because most users are local users, when ACGW that MS adheres to and outlet ACGW in this pond are different ACGW, in the ACGW pond, need between different ACGW, transmit user's business datum, cause the propagation delay time of business datum to increase, also wasted the transfer resource between the ACGW.

To sum up, in the UMTS network, whether shift UE, the target SGSN after the RNC in the Access Network selects to shift by the decision-making of the SGSN in the core net.If evolvement network continues to prolong with the scheme among the UMTS and realizes that travelling carriage inserts PDN by evolution block core net, then require RAN-Node in the evolution wireless access network must know user's APN information, must whether be exactly the border CN-Node of user APN business otherwise the RAN-Node in the evolution wireless access network can't judge target CN-Node according to APN being carried out dns resolution to obtain the address of CN-Node.But APN belongs to the technology of operation layer, and Access Network not will be appreciated that user's APN information; The operation strategy of the management of APN and operator is closely related, when the different operators share of access network, make RAN-Node select CN-Node according to APN, then necessarily require the operation strategy and the APN information of each operator of storage among the RAN-Node, this practice does not meet benefits of operators, because for the operator that has competitive relation, operation policy information and APN information are maintained secrecy.

Therefore, renew at the evolvement network relaying and to realize inserting the method for PDN with the scheme among the UMTS, the CN-Node that can not be mobile station in selecting the best well inserts PDN, has caused the propagation delay time of business datum to increase on the one hand, has wasted the transfer resource between the CN-Node; On the other hand, not meeting benefits of operators, is unpractical.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of method that inserts Data packet network, can be embodied as the core net node accessing group data net of mobile station in selecting the best in evolvement network.

For achieving the above object, technical scheme of the present invention specifically is achieved in that

A kind of method of accessing group data network, mobile station MS is by the core net accessing group data network of evolvement network, and this method may further comprise the steps:

A. Access Network is described MS selection core net node CN-Node according to routing iinformation and adheres to;

B. the current C N-Node that described MS adheres to is according to self-characteristic, and judging whether needs to shift described MS, if do not need the current C N-Node accessing group data net of then described MS by adhering to, process ends; Otherwise, enter step C;

C. current C N-Node determines target CN-Node, and shifts described MS and be attached to target CN-Node, and described MS is by target CN-Node accessing group data net.

Before the steps A, this method also comprises: described MS sets up Access Layer AS with wireless access network node RAN-Node in the Access Network and is connected, and described RAN-Node is that described MS sets up communication context information, distributing radio resource.

Access Network described in the steps A is that MS selects the method for current C N-Node to be:

A1. described MS sends the AS initial message to described RAN-Node;

A2. described RAN-Node selects current C N-Node according to the routing iinformation that carries in the described AS initial message; The NAS-PDU data of adhering to request that are packaged with carrying in the AS initial message are carried in the Non-Access Stratum NAS data passes message, send to current C N-Node.

Described routing iinformation is: by the V value of the IMSI International Mobile Subscriber Identity IMSI acquisition of carrying in the described AS initial message, or the network resource identifier NRI that comprises among the grouping temporary mark eP-TMSI of the evolvement network that carries in the described AS initial message;

Carry the eP-TMSI of the CN-Node distribution of adhering to before the described MS in the described Attach Request message, and the sign TAI of described MS place tracking area in the CN-Node that adheres to before.

Select before the current C N-Node described in the steps A 2, this method also comprises:

If described AS just carries IMSI in the initial message, then described RAN-Node determines described MS operator according to Mobile Country Code MCC MCC that carries among the IMSI and Mobile Network Code MNC;

Perhaps if carry eP-TMSI in the described AS initial message, then described RAN-Node determines described MS operator according to operator's sign that NRI among the eP-TMSI comprises;

Described current C N-Node belongs to definite described MS operator.

The self-characteristic of the N-Node of current C described in the step B comprises: whether whether load is overweight and/or whether prepare to carry out reboot operation and/or be the CN-Node of MS operator and/or the APN business of whether supporting described MS.

N-Node is according to self-characteristic for current C described in the step B, judges whether that the method that needs to shift described MS is:

If the overweight or described current C N-Node of described current C N-Node load prepares to carry out reboot operation or described current C N-Node is not the CN-Node of described MS operator or the APN APN business that described current C N-Node does not support described MS, then need to shift described MS; Otherwise, do not need to shift described MS.

The N-Node of current C described in the step C determines that the method for target CN-Node is:

The load of other CN-Node in the CN-Node pond, current C N-Node place that described current C N-Node is known according to self selects the light CN-Node of load as target CN-Node according to preset strategy.

N-Node is according to self-characteristic for current C described in the step B, and before judging whether to need to shift, this method also comprises:

B1. described current C N-Node sends the MS context request according to the described eP-TMSI and the tracking area identification TAI that carry in the request of adhering to the CN-Node that described MS adheres to before; The CN-Node that adheres to before the described MS is carried at the MS contextual information and returns to described current C N-Node in the MS context response information;

B2. described MS, described current C N-Node and home subscriber server HSS carry out interacting message, finish the authentication to the user;

B3. described current C N-Node sends the update inquiry information of the IMSI that carries described MS to HSS; HSS upgrades the relevant information of described MS; And according to the positional information of the current storage of described MS, judge that CN-Node that MS adheres to changes after, deletion is stored in the MS context among the CN-Node that adheres to before the described MS;

B4.HSS sends the renewal response message that carries user signing contract information or sends to described current C N-Node to described current C N-Node and upgrades response message, and user signing contract information is carried in the default particular message sends to described current C N-Node.

Carry APN information in the described user contracting data; The N-Node of current C described in the step C determines that the method for target CN-Node is:

Described current C N-Node carries out domain name system DNS to APN in the APN tabulation one by one according to the tabulation of the APN in the described user contracting data and resolves the CN-Node address that obtains, until the CN-Node address that draws is the address of a CN-Node in CN-Node pond, current C N-Node place, and then the CN-Node of this CN-Node address correspondence is target CN-Node.

The N-Node of current C described in the step C determines that the method for target CN-Node also comprises: be not present in as if the target CN-Node that draws by described dns resolution and then do not shift described MS in the described CN-Node pond.

The N-Node of current C described in the step C determines after the target CN-Node, shifts described MS and is attached to before the target CN-Node, and this method also comprises:

C11. described current C N-Node sends the temporary mark allocation request message to target CN-Node;

C12. after described target CN-Node receives the temporary mark allocation request message, store the former eP-TMSI that carries in this message, current TAI and current C N-Node ID, and be the new eP-TMSI of MS distribution;

C13. described target CN-Node replys the temporary mark assignment response message that carries new eP-TMSI to current C N-Node;

C14. the new eP-TMSI that carries in the described current C N-Node storage temporary mark assignment response message, and new eP-TMSI and current TAI be carried to adhere to send to described MS in the response.

Among the step C12, after described target CN-Node storage eP-TMSI, TAI and the current C N-Node ID, distribute before the new eP-TMSI, this method also comprises:

Described target CN-Node judges according to self-characteristic that self load is overweight or is just preparing to restart or do not support the APN of described MS, then described target CN-Node distributes refuse information, back method ends flow process to the temporary mark that current C N-Node sends the reason that carries refusal.

Also carry the IMSI of described MS in the allocation request message of temporary mark described in the step C12, and/or shift reason;

Described transfer former because: load is overweight or carry out and to restart or be not the CN-Node of described MS operator or the APN business of not supporting described MS.

Also carry the APN information of described MS in the allocation request message of temporary mark described in the step C12.

The N-Node of current C described in the step C shifts the method that described MS is attached to target CN-Node:

C21. described MS sets up AS with RAN-Node in the described Access Network and is connected;

C22. described MS sends the AS initial message to described RAN-Node, and described RAN-Node is according to the routing iinformation select target CN-Node that carries in the described AS initial message; With the NAS-PDU data that are packaged with tracking area TA update inquiry information of carrying in the AS initial message, be carried in the Non-Access Stratum NAS data passes message, send to target CN-Node;

C23. described target CN-Node obtains described MS context and storage from current C N-Node.

The CN-Node of target described in the step C23 obtains the contextual method of described MS from current C N-Node:

Described target CN-Node sends the MS context request message according to the eP-TMSI that carries in the described TA update inquiry information to described current C N-Node; Described current C N-Node is carried at described MS contextual information and returns to described target CN-Node in the MS context response information.

After the step C23, this method also comprises:

A. described MS, described target CN-Node and HSS carry out interacting message, finish the authentication to the user;

B. described target CN-Node sends the update inquiry information of the IMSI that carries described MS to HSS; HSS upgrades the relevant information of described MS; And according to the positional information of the current storage of described MS, judge that CN-Node that MS adheres to changes after, deletion is stored in the MS context among the CN-Node that adheres to before the described MS; HSS sends the renewal response message that carries user signing contract information to described current C N-Node.

C. eP-TMSI that described target CN-Node will redistribute for MS and described TAI are carried at TA and upgrade in the response message and send to described MS, described MS is connected with target CN-Node releasing network, is released to all resources that MS distributes and attached among the target CN-Node.

Described TA upgrades and also carries period T A renewal timer in the response message;

The timing length that described period T A upgrades timer is the agreement setting.

Among the step C13, described target CN-Node is before current C N-Node replys the temporary mark assignment response message, and this method also comprises: described target CN-Node is provided with one-period TA and upgrades the timer timing length;

Described target CN-Node is carried at the period T A timer timing length that is provided with simultaneously and sends to described current C N-Node in the temporary mark assignment response message;

Described current C N-Node is carried at described period T A timer to adhere to simultaneously and sends to described MS in the response message.

Among the step C13, described target CN-Node is after current C N-Node replys the temporary mark assignment response message, and this method also comprises: described current C N-Node is provided with one-period TA and upgrades the timer timing length;

Described current C N-Node is carried at described period T A timer timing length to adhere to simultaneously and sends to described MS in the response message.

Among the step C21. described MS and RAN-Node in the described Access Network set up before AS is connected, and this method also comprises:

Described MS start-up period TA upgrades timer; When period T A upgrades timer expiry, trigger MS and initiate new tracing section updating process.

Among the step C13, described target CN-Node is after current C N-Node replys the temporary mark assignment response message, and this method also comprises: described target CN-Node is provided with a waiting timer;

Described period T A upgrades before the timer expiry, this method also comprises: if described target CN-Node does not receive tracing section updating request message or Attach Request message from described current C N-Node yet, the current eP-TMSI of the described MS of then described target CN-Node deletion self storage and the CN-Node ID of current C N-Node, and discharge the eP-TMSI that self distributes to MS.

Upgrade that timer starts and time-out period not at described period T A, MS forbids that the user makes a call.

The timing length of described period T A timer is 0 or FFH.

This method further comprises: described MS indicates just in the retry network attachment to the user.

This method also comprises: when described MS activates certain Packet Service, described target CN-Node is according to this professional APN information and obtain the address of border CN-Node by dns resolution, if this border CN-Node is not described target CN-Node, then described target CN-Node is established to the route of border CN-Node, and described MS inserts PDN by described target CN-Node and border CN-Node.

The method that described target CN-Node is established to the route of border CN-Node is:

I. described target CN-Node sends the routing update request message to described border CN-Node;

II. described border CN-Node and described target CN-Node set up the transport layer tunnel according to the packet data protocol PDP Context that carries in the routing update request message;

III. after the tunnel was successfully set up, described border CN-Node replied the routing update response message according to IMSI that carries in the routing update request message or eP-TMSI to described target CN-Node.

Also carry the transport layer Tunnel Identifier in the described routing update request message, be used to identify the transport layer tunnel of described foundation.

Described target CN-Node is the CN-Node in the described MS operator network, perhaps the CN-Node that is connected with the CN-Node of other operators for being used in the CN-Node pond, described current C N-Node place.

Described CN-Node is Access Network-core net gateway A CGW.

Described RAN-Node is evolution base station E-NodeB.

Described Access Network is: the wireless access network of evolvement network, or the wireless access network of universal mobile telecommunications system UMTS network.

As seen from the above technical solution, the present invention has realized the method for the core net node accessing group data net of mobile station in selecting the best in evolvement network.

Method of the present invention is carried out at MS and is adhered to or during tracing section updating, make the CN-Node that adheres to is exactly the border CN-Node of APN business as far as possible, avoid the data forwarding between the different CN-Node in the CN-Node, reduced the propagation delay time of business datum, saved the transfer resource between the CN-Node; Whether the present invention needs to shift MS by the CN-Node judgement that is positioned at core net, and determines the target CN-Node that is transferred to have met benefits of operators, has had practicality.According to the method described above, for MS shifts and the target CN-Node that adheres to belongs to operator under the user, this target CN-Node is overload not, this CN-Node can provide needed, at least a APN business for the user, therefore this target CN-Node is the optimal boundary CN-Node that travelling carriage inserts PDN for MS provides service better.

Description of drawings

Fig. 1 is the schematic network structure of prior art UTMS;

Fig. 2 is the schematic network structure of evolvement network;

Fig. 3 selects GGSN to insert the schematic diagram of PDN by APN among the prior art UMTS;

Fig. 4 prolongs in the evolvement network with the method among the UMTS to select ACGW to insert the schematic diagram of PDN;

Fig. 5 is the flow chart of accessing group data net of the present invention;

Fig. 6 is the flow chart of current C N-Node of the present invention to target CN-Node request temporary mark;

Fig. 7 is a flow chart of setting up route between CN-Node of the present invention;

Fig. 8 a is a flow chart of determining target ACGW in the embodiment of the invention;

Fig. 8 b is the flow chart that in the embodiment of the invention MS is transferred to target ACGW.

Embodiment

Core concept of the present invention is: wireless access network is according to routing iinformation, for the mobile station in selecting core net node and adhere to; Current core net node is according to self-characteristic, and judging whether needs to shift this travelling carriage, if do not need, and the current core net node accessing group data net of this travelling carriage then, process ends by adhering to; If need, then current core net node is determined the target core network node, and shifts this travelling carriage and be attached to the target core network node, and this travelling carriage is by target core network node accessing group data net.

For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing preferred embodiment that develops simultaneously, the present invention is described in more detail.

Fig. 5 is the flow chart of accessing group data net of the present invention, supposes that MS inserts PDN by the evolution block core net of evolvement network, and the inventive method may further comprise the steps:

Step 500: wireless access network is according to routing iinformation, for the mobile station in selecting core net node and adhere to.

Wireless access network can be the wireless access network of evolvement network, also can be the wireless access network of UMTS network, and the intercommunication problem of the Access Network of UMTS and evolution block core net does not belong to category of the present invention.

Travelling carriage among the present invention (MS) is meant all mobile subscriber equipments.

Adhere in start, when tracing section updating or activating service, MS and evolution block core net carry out Signalling exchange: MS and send Access Layer (AS) initial message to RAN-Node, after RAN-Node receives the AS initial message, according to the routing iinformation that carries in this AS initial message, for MS selects a CN-Node is current C N-Node, and the NAS-PUD data of carrying in this AS initial message are routed to current C N-Node.Here, the AS initial message is used to carry the up AS message of first NAS-PDU data, and the AS initial message can be article one AS message that MS sends to RAN-Node, also can be a specific AS message; MS and wireless access network interactive signaling message are referred to as AS message, and MS and core net interactive signaling message are referred to as NAS message, and NAS message aloft is carried in the AS message as the NAS-PDU data on the interface to be transmitted.

If being MS, the AS initial message sends to article one message of RAN-Node, the sign of carrying MS in the AS initial message then, the sign of MS can be permanent identification such as IMSI, or the grouping temporary mark (eP-TMSI) of evolvement network, need to prove, eP-TMSI only represents to exist a kind of grouping temporary mark of evolvement network, and the actual name of this temporary mark is finally determined by the technical standard that 3GPP formulates.If general MS has eP-TMSI then uses eP-TMSI, otherwise use IMSI.If that carry in the AS initial message is IMSI, then RAN-Node utilizes IMSI and selects CN-Node according to assignment algorithm, such as, calculate V value=[(IMSI Div 10) Mod 1000], the CN-Node of mapping relations unique selection according to V value that sets in advance among the RAN-Node and CN-Node selects the light CN-Node of load as current C N-Node as current C N-Node or according to the load information of each CN-Node in the CN-Node pond again; If that carry in the AS initial message is eP-TMSI, then RAN-Node is according to the NRI that carries among the eP-TMSI, and all CN-Node and the corresponding relation of NRI separately in the CN-Node pond that sets in advance among the RAN-Node in, selects current C N-Node;

If the AS initial message is a specific AS message, then carry routing iinformation in this AS initial message, this routing iinformation is that MS derives out according to IMSI or eP-TMSI, such as: if MS uses IMSI as user ID, then routing iinformation is the V value, i.e. [(IMSI Div 10) Mod 1000]; If MS uses eP-TMSI as user ID, then routing iinformation is NRI.RAN-Node selects current C N-Node according to routing iinformation;

If do not have routing iinformation in the message, then RAN-Node can select current C N-Node according to load or the alternate manner of CN-Node.In a word, RAN-Node can select a CN-Node to provide service for MS in preset data according to IMSI, NRI or routing iinformation.

Share under the situation at network, if RAN-Node is connected with the CN-Node of different operators network, RAN-Node at first selects the CN-Node of MS operator network when selecting CN-Node.Concrete grammar is: if carry IMSI in the AS initial message, then RAN-Node is according to the Mobile Country Code MCC (MCC that carries among the IMSI, Mobile Country Code) and Mobile Network Code (MNC, MobileNetwork Code), can determine the MS operator, thereby in this carrier network, select current C N-Node; If carry eP-TMSI in the AS initial message, then operator's sign of carrying according to NRI among the eP-TMSI is determined the described operator of MS, thereby selects current C N-Node in this carrier network.

Step 501～step 502: current C N-Node is according to self-characteristic, and judging whether needs to shift this travelling carriage, if do not need, then this travelling carriage is by current C N-Node accessing group data net, process ends; If need, then enter step 503.

The CN-Node self-characteristic can comprise: 1. whether load is overweight; 2. whether prepare to carry out reboot operation; 3. whether be the CN-Node of MS operator; 4. whether be best suited for CN-Node that adheres to MS or the like.How specifically describe current C N-Node below judges according to self-characteristic:

Situation 1., in the CN-Node pond, between each CN-Node by transmitting separately load information to know the load information of other CN-Node.Such as, when the load variations certain percentage of certain CN-Node as 5% the time, this CN-Node is all other CN-Node reports self present load in the CN-Node pond.In the CN-Node pond, set in advance a load-threshold, when the load of certain CN-Node surpasses this load-threshold, then this CN-Node is according to the load information of other CN-Node of knowing, by adhering to again or tracing section updating will be transferred to attached to the MS in self among the lighter CN-Node of other load.How to transmit load information between CN-Node, do not belong to category of the present invention, no longer describe in detail here, what emphasize is, CN-Node judges whether to shift the MS that adheres to according to self loading condition.

Situation 2., usually by Operation and Maintenance (O﹠amp; M) operational order triggers CN-Node and prepares to carry out reboot operation, and the CN-Node for preparing to restart no longer accepts adhering to and the tracing section updating request of MS, and the MS that will adhere to transfers among other CN-Node.

Situation 3., if the MS that CN-Node adheres to less than preparation according to operator's sign inquiry of carrying among the eP-TMSI, then to this MS request IMSI, judge by MCC among the IMSI and MNC whether this MS is the user of this CN-Node operator network, if not, then this MS is transferred among the suitable target CN-Node, this target CN-Node can be the CN-Node of MS operator network, also can be CN-Node that special CN-Node interconnects as CN-Node responsible and other operators in the current C N-Node pond.

Situation 4., in the user's that CN-Node receives subscription data, include APN information, if the user supports a plurality of APN, then first APN in the APN information list is predetermined to be default APN, such as the APN that internet protocol multimedia subsystem (IMS) is professional as default APN.CN-Node judges whether that according to the APN information in user's the subscription data needs shift MS, and the target CN-Node after the decision transfer.Such as: CN-Node carries out dns resolution to default APN and obtains a CN-Node address, continues to resolve and judge as default APN if this CN-Node not in this CN-Node pond, then gets next APN; If resolving the CN-Node that obtains is exactly current C N-Node, then do not need to shift this user; If resolve the CN-Node obtain in this CN-Node pond but be not this CN-Node, then need the user transferred to and resolve among the CN-Node that obtains; If the CN-Node that parsing obtains not in this CN-Node pond, does not then shift MS.

Need to prove that the self-characteristic of above-mentioned CN-Node can judge after the reasonable combination, even be the CN-Node of MS operator such as current C N-Node, but this CN-Node load is overweight, so also should shift MS etc.This reasonable combination belongs to that those skilled in the art draw easily, enumerates no longer one by one here.

Step 503～step 504: current C N-Node determines target CN-Node, and shifts this travelling carriage and be attached to target CN-Node, and this travelling carriage is by target CN-Node accessing group data net.

If current C N-Node can't determine the target CN-Node that shifts then not shift MS in this CN-Node pond.

Current C N-Node determines that the method for target CN-Node is corresponding, specific as follows with above-mentioned four kinds of determination methods:

Corresponding situation 1., CN-Node is according to the load information of other CN-Node of knowing, according to the lighter CN-Node of certain predetermined policy selection load as target CN-Node; Corresponding situation 2., CN-Node also can be according to the load information of other CN-Node of knowing, according to the lighter CN-Node of certain predetermined policy selection load as target CN-Node; 3. corresponding situation can select the target CN-Node corresponding with this NRI or according to the load information of other CN-Node of knowing according to the NRI that carries among the eP-TMSI, according to the lighter CN-Node of certain policy selection load as target CN-Node etc.; 4. corresponding situation carries out the CN-Node of a CN-Node address correspondence in this CN-Node pond that dns resolution obtains as target CN-Node to APN one by one.

Shifting the method that this travelling carriage is attached to target CN-Node specifically describes as follows:

At first, it is that MS distributes eP-TMSI that current C N-Node needs request target CN-Node, carries the NRI of target CN-Node in this eP-TMSI.Flow process as shown in Figure 6, Fig. 6 is current C N-Node of the present invention to the flow chart of target CN-Node request temporary mark, may further comprise the steps:

Step 600: current C N-Node sends the temporary mark allocation request message to target CN-Node, and request target CN-Node is that MS distributes new temporary mark eP-TMSI.

The TAI that can carry the original grouping temporary mark of MS in the temporary mark allocation request message and be the current place of former eP-TMSI, MS tracking area is that the sign of current TAI, current C N-Node is current C N-Node ID.Can also carry the IMSI of MS in this temporary mark allocation request message and/or shift reason (Cause) etc.; If the MS that does not support default APN to cause owing to CN-Node shifts, it may also be pointed out that the APN information parameter item of MS in this temporary mark allocation request message.

Here, the value of Cause parameter can be: apparatus overload, i.e. expression cause the former because the CN-Node load is overweight of MS transfer; Non-provider customer, i.e. expression causes the former because MS is not the user of CN-Node operator network of MS transfer; Do not support user's APN, i.e. expression causes the former because CN-Node does not support APN business of user or the like of MS transfer.

After step 601: target CN-Node receives the temporary mark allocation request message, store the current eP-TMSI that carries in this message, current TAI and CN-Node ID, and be new eP-TMSI for MS distributes new eP-TMSI.

Target CN-Node can also further specify very short or particular value of time as 0 or the period T A of FFH upgrade timer (periodic TA update timer), this period T A upgrades timer and is used for when overtime, trigger MS and initiate new tracing section updating, make MS be transferred to target CN-Node.

When MS initiates new tracing section updating, target CN-Node need obtain the contextual information of MS from the current CN-Node that adheres to, therefore, current C N-Node ID, current TAI of the current tracking area of living in of MS that carries in the target CN-Node storage temporary mark allocation request message in this step and the former eP-TMSI of MS.

Step 602: target CN-Node replys the temporary mark assignment response message to current C N-Node, carries the new eP-TMSI that target CN-Node distributes in this message.The new eP-TMSI that carries in the current C N-Node storing message.

Can further include period T A in this temporary mark assignment response message and upgrade timer.Target CN-Node starts a waiting timer wait MS initiating updating of tracking area or adheres to, if waiting timer is overtime, do not receive tracing section updating request or Attach Request message yet from MS, then target CN-Node will delete current eP-TMSI, current TAI and the current C N-NodeID of the interim storage of step 601, and be released to the new eP-TMSI that MS distributes.

Need to prove that (1) period T A upgrades timer and also can be specified by current C N-Node, do not have this moment the period tracking district to upgrade timer parameter in the temporary mark assignment response message;

(2) if target CN-Node refusal temporary mark request for allocation, overweight or just preparing to restart or do not support APN of user etc. such as target CN-Node load, target CN-Node sends temporary mark to current C N-Node and distributes refuse information, in message, carry the reason of refusal, current C N-Node should select other appropriate C N-Node, and request distributes temporary mark again;

(3) if the user made a call before MS carries out new tracing section updating flow process, because new eP-TMSI belongs to target CN-Node, RAN-Node can be routed to call request message target CN-Node, and this moment, target CN-Node did not carry out authentication to MS, the contextual information that does not also have MS, therefore call out and to fail, generation for fear of this situation, method provided by the invention is: it is a particular value as 0 or full FFH that designated period TA upgrades timer, like this, after MS receives the temporary mark assignment response message, initiate new tracing section updating immediately, further, MS just in the retry network attachment, avoids the user to make a call to user's indication; Perhaps, before period T A upgraded timer expiry, MS forbade that the user makes a call.

From description, among the present invention, whether need to shift MS, and determine the target CN-Node that is transferred to by the CN-Node in evolution block core net judgement to Fig. 6.The method of select target CN-Node considers also simultaneously whether load state, the target CN-Node of target CN-Node belong to the affiliated operator of user, the factors such as APN business whether target CN-Node supports the user, guarantees that target CN-Node can realize that MS inserts PDN.

In step 503～step 504, choose after the target CN-Node, MS will or initiate new tracing section updating when period T A upgrades timer expiry immediately, be transferred to target CN-Node, and specific implementation mainly comprises:

MS initiates new tracing section updating, and RAN-Node is according to the NRI select target CN-Node that is carried in the TA update request among the new eP-TMSI, and the tracing section updating request message is routed to target CN-Node.Target CN-Node determines the address of the CN-Node current C N-Node that MS adheres to before according to the current C N-Node ID that stores from the distribution temporary mark time, and shifts the contextual information of MS to this CN-Node that determines request.

Target CN-Node obtains contextual information, carries out normal tracing section updating flow process, finishes the tracing section updating to MS.In this process, be positioned at home network be used to store the contextual information that CN-Node that the home subscriber server (HSS) of all and user and service related data adheres to before can instruct MS removes MS, and target CN-Node may be MS distribution temporary mark eP-TMSI again.

Finally, MS shifts and attached among the target CN-Node, this target CN-Node can provide service better for MS, and overload, this CN-Node can not provide needed, at least a APN business for the user because this CN-Node belongs to the affiliated operator of user, this target CN-Node.At this moment, target CN-Node can be called and adhere to CN-Node, can provide service for the APN of MS if this adheres to CN-Node, then this adheres to CN-Node border CN-Node just.

Be transferred once more afterwards for avoiding MS to transfer to target CN-Node, cause the signaling increase and can not set up calling, should take measures necessary, for example MS transfers to after the target CN-Node, in target CN-Node, start a timer, do not shift MS before the timer expiry, but concrete measure is relevant with the equipment realization, does not belong to category of the present invention.

Further, the present invention also comprises: when MS activates certain Packet Service, adhere to the APN information of CN-Node according to business, obtain the address of border CN-Node by dns resolution.If border CN-Node is not that this adheres to CN-Node, then adhere to the route that CN-Node need be established to border CN-Node.Here, border CN-Node may be just in adhering to the CN-Node pond of CN-Node, also may be but do not adhering in the CN-Node pond of CN-Node in this locality, also may be at home network.Fig. 7 is a flow chart of setting up route between CN-Node of the present invention, as shown in Figure 7, describes as a kind of example and to adhere to CN-Node to be established to the method for the route between the CN-Node of border as follows:

Step 700: adhere to CN-Node and send the routing update request message to border CN-Node, the contextual information that carries user ID IMSI or eP-TMSI, Packet Service in this routing update request message is a PDP Context, and by adhering to the transport layer Tunnel Identifier of CN-Node for this traffic assignments.

Step 701: border CN-Node and adhere between the CN-Node and set up the transport layer tunnel according to PDP Context.How to set up the tunnel, do not belong to category of the present invention, no longer describe in detail here.

Step 702: after the tunnel was successfully set up, border CN-Node replied the routing update response message to adhering to CN-Node, represented that current APN is professional by this border CN-Node access PDN.

In sum, method of the present invention is carried out at MS and is adhered to or during tracing section updating, make the CN-Node that adheres to is exactly the border CN-Node of APN business as far as possible, avoid some professional grouped data data forwarding between the different CN-Node in the CN-Node pond, reduce the propagation delay time of these business datums, saved the transfer resource between the CN-Node; Whether the present invention needs to shift MS by the CN-Node judgement that is positioned at core net, and determines the target CN-Node that is transferred to have met benefits of operators, has had practicality.According to the method described above, for MS shifts and the target CN-Node that adheres to belongs to operator, this target CN-Node under the user overload, this CN-Node can not provide needed, at least a APN business for the user, therefore this target CN-Node is the optimal boundary CN-Node that travelling carriage inserts PDN for MS provides service better.

Fig. 8 a is a flow chart of determining target ACGW in the embodiment of the invention, Fig. 8 b is the flow chart that in the embodiment of the invention MS is transferred to target ACGW, for making the solution of the present invention more clear, be example with Fig. 8 a and Fig. 8 b below, suppose that CN-Node is ACGW, describe the process of not supporting user's the professional user's transfer that causes of APN because of ACGW1 in detail.

Suppose that MS enters before the pool area, in ACGWp, the ACGW in the ACGWp right and wrong ACGW pond; N ACGW arranged in the ACGW pond, is respectively ACGW1, ACGW2...ACGWn; After MS enters pool area, at first attempt to be attached to ACGW1, because ACGW1 does not support user's APN business, ACGW1 transfers to ACGWn with MS.The user supports APN1 business, APN2 business and APN3 business, and wherein APN1 is default APN.

Step 801: before mobile subscriber's start was adhered to, MS set up AS with RAN-Node and is connected.Set up the process that AS connects, be exactly RAN-Node be the process that MS sets up communication context information, distributing radio resource.Such as, MS sends to connect to RAN-Node and sets up request message, and RAN-Node after MS sets up communication context information, distributing radio resource, replys connection establishment response message to MS.The concrete grammar that MS and RAN-Node connect does not belong to category of the present invention, no longer describes in detail here.

After step 802:AS connected foundation, MS initiated attaching process to ACGW1, specifically comprises step 802a and step 802b:

Step 802a:MS sends the AS initial message to RAN-Node, carries NAS-PDU data and routing iinformation in this AS initial message.

Attach Request message belongs to NAS message, and is article one NAS message that MS sends to ACGW, so MS is encapsulated in login request message in the NAS-PDU data, is carried in the AS initial message and sends to RAN-Node; The routing iinformation that carries in the AS initial message is the NRI among the eP-TMSI.Need to prove that if MS does not have eP-TMSI, then MS uses IMSI as user ID, routing iinformation can be derived by IMSI and be obtained, such as the V value, i.e. and V value=[(IMSI Div 10) Mod 1000] etc.

After step 802b:RAN-Node receives the AS initial message, be that NRI selects ACGW1 according to routing iinformation.RAN-Node sends NAS data passes message to ACGW1, carries the NAS-PDU data in this NAS data passes message.

NAS data passes message is specifically designed to carrying NAS message between RAN-Node and ACGW.Need to prove that at the S1 interface, the NAS-PDU data also can use other message to transmit.

Behind execution in step 802a and the step 802b, Attach Request message is routed to ACGW1, carry eP-TMSI and the TAI of MS in ACGWp in the Attach Request message, eP-TMS is that MS distributes in ACGWp, and TAI is the sign of MS tracking area of position during attached to ACGWp.

Need to prove that in the present embodiment, initial message is not article one message that MS sends to RAN-Node.The AS initial message also can be article one message that MS sends to RAN-Node, sets up request message such as the connection of mentioning in the step 801, and NAS-PDU was carried in article one AS message and sent to RAN-Node this moment.Because initial message is the AS message of carrying first NAS-PDU data, if when in step 801, setting up AS and connecting, just the NAS-PDU data carry in connection request message, connection request message in fact also is initial message so.

After step 803a～step 803b:ACGW1 receives Attach Request message, send the MS context request to ACGWp, ACGWp is carried at the MS contextual information in the MS context response information and returns to ACGW1.

ACGW1 determines that according to eP-TMSI that carries in the Attach Request message and TAI MS before attached to ACGWp, sends the MS context request message to ACGWp, and carry eP-TMSI and the TAI of MS in ACGWp in the MS context request message;

ACGWp returns the MS context response information to ACGW1, carries contextual information and the eP-TMSI of MS in ACGWp of MS in this MS context response information.

Step 804:MS, ACGW1 and HSS carry out interacting message to finish the authentication to the user.The specific implementation of authentication does not belong to category of the present invention, no longer describes in detail here.

Step 805～step 807:ACGW1 sends update inquiry information to HSS, and purpose is to upgrade the position of MS, makes HSS know which ACGW MS is currently located at.Carry user's IMSI in this update inquiry information; After HSS receives update request, in database, upgrade relevant information such as the positional information of MS.HSS is according to the positional information of the current storage of MS, and after the change of ACGW generation from ACGWp to ACGW1 that judgement MS adheres to, notice ACGWp deletes the MS contextual information; Afterwards, HSS sends to ACGW1 and upgrades response message, carries user's CAMEL-Subscription-Information in this renewal response message, comprising user's APN information.

Need to prove that HSS also can adopt default particular message to send CAMEL-Subscription-Information to ACGW.

After step 808a～step 808c:ACGW1 receives and upgrades response message, suppose in the present embodiment, according to the APN information in the user contracting data, know that the user supports that a plurality of APN business are the APN1 business, professional and the APN3 business of APN2, current ACGW1 does not support APN1, APN2 and APN3, and first APN in the hypothesis APN tabulation is that default APN is APN1, and ACGW1 carries out ACGW address that dns resolution obtains not in this ACGW pond to APN1, resolve one by one in order, and resolve the address that obtains ACGWn by APN2 and be positioned at this ACGW pond, then ACGW1 transfers to the user and resolves among the ACGWn that obtains, and just ACGWn is chosen to be target ACGW.

ACGW1 sends the temporary mark allocation request message to ACGWn, carry the TAI and the ACGW1 ID of the current eP-TMSI of MS, the current place of MS tracking area in the message, and the cause value Cause that shifts MS, in the present embodiment, the reason that ACGW1 shifts MS is exactly the APN business that ACGW1 does not support MS; After ACGWn receives the temporary mark allocation request message, store the current eP-TMSI that carries in this temporary mark allocation request message, current TAI and ACGW1 ID; ACGWn is that MS distribution temporary mark is new eP-TMSI, specify a very short period T A of time to upgrade timer such as about several seconds, and with new eP-TMSI, it is that timing length is carried in the temporary mark assignment response message and sends to ACGW1 that period T A upgrades timer parameter, ACGWn starts a waiting timer simultaneously, the tracing section updating request message or the Attach Request message that send by MS in the waiting step 814, if this timer expiry, ACGWn does not receive tracing section updating request message or Attach Request message yet, then ACGWn deletes the former eP-TMSI of interim storage among the step 808b, current TAI and ACGW1 ID, and discharge the new eP-TMSI that self distributes to MS.Specific implementation can be described referring to Fig. 6, repeats no more here.

Step 809:ACGW1 replys one to MS and adheres to response message, and this adheres to new eP-TMSI and the timer parameter that carries the ACGWn distribution in the response message, points out to adhere to successfully.

Need to prove, adhere to response message and also be encapsulated in the NAS-PDU data, between MS, RAN-Node and ACGW, transmit that the transport process acquaintance with Attach Request message is not described in detail here.

Step 810: after adhering to end, MS is connected with the ACGW1 releasing network, is released to all resources that MS distributes, but the reservation of the contextual information among the ACGW1, MS enters idle condition, and this moment, MS was still attached among the ACGW1.

Step 811～step 812:MS start-up period TA upgrades timer; When period T A upgrades timer expiry, trigger MS and initiate new tracing section updating process.

Need to prove, be 0 or FFH if designated period TA upgrades timer duration, and MS can need not to start timer so, and carries out tracing section updating after entering Idle state immediately, also promptly need not execution in step 811 and step 812.

Step 813:MS initiates the period tracking district and upgrades, and MS sets up AS with RAN-Node and is connected, and is in full accord with step 801, no longer repeats here.

Step 814:MS sends the TA renewal process to ACGWn, specifically comprises step 814a and step 814b:

Step 814a:MS sends the AS initial message to RAN-Node, carries NAS-PDU data and routing iinformation in this AS initial message.

The TA update inquiry information belongs to NAS message, and is article one NAS message that MS sends to ACGW, so MS is encapsulated in the TA update inquiry information in the NAS-PDU data, and is carried in the AS initial message and sends to RAN-Node; The routing iinformation that carries in the AS initial message is the NRI that carries among the eP-TMSI of ACGWn distribution.

After step 814b:RAN-Node receives the AS initial message, be that NRI selects ACGWn according to routing iinformation.RAN-Node sends NAS data passes message to ACGWn, carries NAS-PDU in this NAS data passes message.

Behind execution in step 814a and the step 814b, the TA update inquiry information is routed to ACGWn, and carrying ACGWn in the TA update inquiry information is new eP-TMSI and the current TAI that MS distributes; After ACGWn receives the TA update inquiry information, stop the waiting timer that starts among step 808a～step 808b.

After step 815a～step 815b:ACGWn receives the TA update inquiry information, send the MS context request message to ACGW1, this MS context request message carries former eP-TMSI and the TAI of MS; ACGW1 determines before the MS attached among the ACGW1 according to the former eP-TMSI that carries in the MS context request message and TAI, and this MS contextual information is carried in the MS context response information returns to ACGWn.

Step 816:MS, ACGWn and HSS carry out interacting message, finish the authentication to the user.This step specific implementation and step 804 are in full accord, do not belong to category of the present invention, no longer describe in detail here.

Step 817～step 819:ACGW1 sends update inquiry information to HSS, and purpose is to upgrade the position of MS, makes HSS know which ACGW MS is currently located at.Carry user's IMSI in this update inquiry information; After HSS receives update request, in database, upgrade relevant information such as the positional information of MS.HSS is according to the positional information of the current storage of MS, and after the ACGW that judgement MS adheres to changed, notice ACGW1 deleted the MS contextual information; Afterwards, HSS sends to ACGWn and upgrades response message, carries user's CAMEL-Subscription-Information in this renewal response message, comprising user's APN information.

Step 820: suppose that ACGWn transships, then accept the TA update request of MS, and hypothesis ACGWn is again for MS distributes new eP-TMSI, and the eP-TMSI that redistributes and period T A are upgraded timer parameter be carried in the TA renewal response message and send to MS.

Described timer length is the normal value of agreement regulation, generally is about dozens of minutes, can be with reference to related protocol.

After step 821:TA renewal process finishes, if current MS does not activate any business, MS is connected with the ACGWn releasing network, be released to all resources that MS distributes, but the contextual information among the ACGWn keeps, and MS enters idle condition, at this moment, MS is attached among the ACGWn, and ACGWn is exactly the border ACGW with the APN service access PDN of MS.

The inventive method also can be used for the load balance in the CN-Node pond, promptly when certain CN-Node load is overweight, adheres to initiating or the MS of tracing section updating transfers among the lower CN-Node of other loads in the CN-Node pond.The process that shifts is identical with the embodiment of Fig. 8 a and 8b.

The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention, all any modifications of being made within the spirit and principles in the present invention, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. the method for an accessing group data network is characterized in that, mobile station MS is by the core net accessing group data network of evolvement network, and this method may further comprise the steps:

2. method according to claim 1, it is characterized in that, before the steps A, this method also comprises: described MS sets up Access Layer AS with wireless access network node RAN-Node in the Access Network and is connected, and described RAN-Node is that described MS sets up communication context information, distributing radio resource.

3. method according to claim 2 is characterized in that, Access Network described in the steps A is that MS selects the method for current C N-Node to be:

A1. described MS sends the AS initial message to described RAN-Node;

4. method according to claim 3, it is characterized in that, described routing iinformation is: by the V value of the IMSI International Mobile Subscriber Identity IMSI acquisition of carrying in the described AS initial message, or the network resource identifier NRI that comprises among the grouping temporary mark eP-TMSI of the evolvement network that carries in the described AS initial message;

5. method according to claim 4 is characterized in that, selects before the current C N-Node described in the steps A 2, and this method also comprises:

Described current C N-Node belongs to definite described MS operator.

6. method according to claim 1, it is characterized in that the self-characteristic of the N-Node of current C described in the step B comprises: whether whether load is overweight and/or whether prepare to carry out reboot operation and/or be the CN-Node of MS operator and/or the APN business of whether supporting described MS.

7. method according to claim 1 is characterized in that, N-Node is according to self-characteristic for current C described in the step B, judges whether that the method that needs to shift described MS is:

8. method according to claim 1 is characterized in that, the N-Node of current C described in the step C determines that the method for target CN-Node is:

9. method according to claim 1 is characterized in that, N-Node is according to self-characteristic for current C described in the step B, and before judging whether to need to shift, this method also comprises:

10. method according to claim 9 is characterized in that, carries APN information in the described user contracting data; The N-Node of current C described in the step C determines that the method for target CN-Node is:

11. method according to claim 10, it is characterized in that the N-Node of current C described in the step C determines that the method for target CN-Node also comprises: be not present in as if the target CN-Node that draws by described dns resolution and then do not shift described MS in the described CN-Node pond.

12. method according to claim 1 is characterized in that, the N-Node of current C described in the step C determines after the target CN-Node, shifts described MS and is attached to before the target CN-Node, and this method also comprises:

13. method according to claim 12 is characterized in that, among the step C12, after described target CN-Node storage eP-TMSI, TAI and the current C N-Node ID, distributes before the new eP-TMSI, this method also comprises:

14. method according to claim 12 is characterized in that, also carries the IMSI of described MS in the allocation request message of temporary mark described in the step C12, and/or shifts reason;

15. according to claim 12 or 14 described methods, it is characterized in that, also carry the APN information of described MS in the allocation request message of temporary mark described in the step C12.

16. method according to claim 12 is characterized in that, the N-Node of current C described in the step C shifts the method that described MS is attached to target CN-Node and is:

17. method according to claim 16 is characterized in that, the CN-Node of target described in the step C23 obtains the contextual method of described MS and is from current C N-Node:

18. method according to claim 16 is characterized in that, after the step C23, this method also comprises:

19. method according to claim 18 is characterized in that, described TA upgrades and also carries period T A renewal timer in the response message;

20. method according to claim 16, it is characterized in that, among the step C13, described target CN-Node is before current C N-Node replys the temporary mark assignment response message, and this method also comprises: described target CN-Node is provided with one-period TA and upgrades the timer timing length;

21. method according to claim 16, it is characterized in that, among the step C13, described target CN-Node is after current C N-Node replys the temporary mark assignment response message, and this method also comprises: described current C N-Node is provided with one-period TA and upgrades the timer timing length;

22., it is characterized in that, among the step C21 according to claim 20 or 21 described methods. described MS and RAN-Node in the described Access Network set up before AS is connected, and this method also comprises:

23. method according to claim 22 is characterized in that, among the step C13, described target CN-Node is after current C N-Node replys the temporary mark assignment response message, and this method also comprises: described target CN-Node is provided with a waiting timer;

24. according to claim 22 or 23 described methods, it is characterized in that: upgrade that timer starts and time-out period not at described period T A, MS forbids that the user makes a call.

25. according to claim 22 or 23 described methods, it is characterized in that: the timing length of described period T A timer is 0 or FFH.

26. method according to claim 25 is characterized in that, this method further comprises: described MS indicates just in the retry network attachment to the user.

27. method according to claim 1, it is characterized in that, this method also comprises: when described MS activates certain Packet Service, described target CN-Node is according to this professional APN information and obtain the address of border CN-Node by dns resolution, if this border CN-Node is not described target CN-Node, then described target CN-Node is established to the route of border CN-Node, and described MS inserts PDN by described target CN-Node and border CN-Node.

28. method according to claim 27 is characterized in that, the method that described target CN-Node is established to the route of border CN-Node is:

29. method according to claim 28 is characterized in that: also carry the transport layer Tunnel Identifier in the described routing update request message, be used to identify the transport layer tunnel of described foundation.

30. according to each described method of claim 1 to 29, it is characterized in that, described target CN-Node is the CN-Node in the described MS operator network, perhaps the CN-Node that is connected with the CN-Node of other operators for being used in the CN-Node pond, described current C N-Node place.

31., it is characterized in that described CN-Node is Access Network-core net gateway A CGW according to each described method of claim 1 to 29.

32., it is characterized in that described RAN-Node is evolution base station E-NodeB according to each described method of claim 1 to 29.

33., it is characterized in that described Access Network is: the wireless access network of evolvement network, or the wireless access network of universal mobile telecommunications system UMTS network according to each described method of claim 1 to 29.