CN100362829C - Method and apparatus of IPv6 and IPv4 GPRS core net interconnecting - Google Patents

Abstract

The present invention provides an intercommunication method of a core network of IPv6 GPRS and IPv4 GPRS, and a GSN proxy which is allocated with an IPv4 address and an IPv6 address is provided. The method comprises the following steps: a. when a source GSN inquires an IP address corresponding to a target GSN, a GSN proxy IP address which has a same IP edition with a source network is obtained, and up run GTP information is encapsulated by using an IP edition of the source network and transmitted to the GSN proxy; B. an address of the source GSN in the up run GTP information is modified by the GSN proxy to an address of the GSN proxy which has a same IP edition with a target network, and when the IP address corresponding to the target GSN is inquired, the up run GTP information is encapsulated by an IP edition of the target network and transmitted to the GSN of the target network; C. when the GSN proxy receives GTP down run information returned by the target GSN, an address of the source GSN of the GTP down run information is modified to an address of the GSN proxy which has a same IP edition with the source network, and the GTP down run information is encapsulated by using the IP edition of the source network and transmitted to the source network GSN. Besides, with the present invention, the intercommunication of core networks of different IP editions can be realized.

Description

The method and the device of IPv6 and IPv4 GPRS core net interconnecting

Technical field

The present invention relates to technical field of data transmission, be meant the method and the device of a kind of IPv6 GPRS core net and IPv4GPRS core net interconnecting especially.

Background technology

Public GPRS core net (GPRS CN) provide packet switching service, and general packet wireless service support node (GSN, GPRS Support Node) is a network node main in the GPRS network, comprised to support the required function of GPRS.Wherein, GSN comprises two types: service GSN (SGSN, Serving GSN) and gateway GSN (GGSN, Gateway GSN).

Wherein, SGSN is the node that mobile management is provided for MS.The main effect of SGSN is exactly the current location that writes down MS, and storage class is similar to the PDP Context of call record, and transmits the mobile packet data between MS and the GGSN.GGSN is storing the gprs service user's who belongs to this node PDP Context, and uses GPRS Tunnel Protocol (GTP, GPRS Tunneling Protocol) and SGSN communication.GGSN mainly has been the gateway effect, realizes the GPRS network The interconnection between data networks different with other.

In the version before the 3GPP R5, GTP message (be GTP-PDU, be GTP-C or GTP-U message) is by IPv4 (IP version 4) carrying encapsulation, i.e. GTP over IP4, and the GSN address cell in the GTP message is the IPv4 address.For explaining conveniently, SGSN Address for Control Plane and SGSN Address for user traffic are referred to as the SGSN address, and GGSN Address for ControlPlane and GGSN Address for user traffic are referred to as the GGSN address.SGSN address and GGSN address are referred to as described GSN address.3GPP R5 and after in the version, 3GPP requires the GTP can be by IPv6 (IP version 6) carrying encapsulation, i.e. GTP over IPv6, the GSN address cell in the GTP message is the IPv6 address, promptly supports to use between the GSN IPv6 carrying GTP to carry out communication.

In the present GPRS core net, mainly comprise three class GSN.Support the GSN of GTP over IPv4 and GTP over IPv6 simultaneously, be called two stack GSN, be also referred to as C type GSN (TYPE C GSN), TYPE C GSN disposes IPv4 address and IPv6 address, can oneself the IPv4 address and the IPv6 address on monitor GTP message simultaneously, receive the GTP message of IPv4 encapsulation and the GTP message of IPv6 encapsulation respectively, and encapsulate GTP message with the IP carrying of respective version.Only support the GSN of GTP over IPv4 to be called TYPE A GSN.Only support the GSN of GTP over IPv6 to be called TYPE B GSN.

In 3GPP TS 29.060 v6.1.0, the design of a kind of GTP over IPv6 has been described, realize intercommunication coexistence with GTP over IPv4.This design adopts TYPE C GSN to support IPv6 and IPv4 communication in network, revises GTP message simultaneously, has increased new GSN address cell and has realized communication between TYPE C GSN and TYPE A GSN.

Shown in table 1,2, table 1 is Create PDPContext Response message (InformationElements in a Create PDP Context Response), table 2 is SGSN-Initiated UpdatePDP Context Request message (Information Elements in an SGSN-Initiated UpdatePDP Context Request), be the GTP message of 3GPP TS29.060 v6.1.0 definition, other GTP message can no longer be enumerated referring to 3GPP TS 29.060 v6.1.0.As can be seen, having increased new GSN address cell in existing GTP message comprises: Alternative GGSN Address forControl Plane cell, Alternative GGSN Address for user traffic cell, AlternativeSGSN Address for Control Plane cell, Alternative SGSN Address for usertraffic cell.

Cell (Information element)	Existence demand (Presence requirement)
		Cause	Mandatory
Reordering?required	Conditional
		Recovery	Optional
Tunnel?Endpoint?Identifier?Data?I	Conditional
		Tunnel?Endpoint?Identifier?Control?Plane	Conditional
Charging?ID	Conditional
		End?User?Address	Conditional
Protocol?Configuration?Options	Optional

GGSN?Address?for?Control?Plane	Conditional
		GGSNA?ddress?for?user?traffic	Conditional
Alternative?GGSN?Address?for?Control?Plane	Conditional
		Alternative?GGSN?Address?for?user?traffic	Conditional
Quality?of?Service?Profile	Conditional
		Charging?Gateway?Address	Optional
Alternative?Charging?Gateway?Address	Optional
		Private?Extension	Optional
Common?Flags	Optional

Table 1

Cell (Information element)	Existence demand (Presence requirement)
		IMSI	Conditional
Routeing?Area?Identity(RAI)	Optional
		Recovery	Optional
Tunnel?Endpoint?Identifier?Data?I	Mandatory
		Tunnel?Endpoint?Identifier?Control?Plane	Conditional
NSAPI	Mandatory
		Trace?Reference	Optional
Trace?Type	Optional
		Protocol?Configuration?Options	Optional
SGSNA?ddress?for?Control?Plane	Mandatory
		SGSNA?ddress?for?User?Traffic	Mandatory
Alternative?SGSN?Address?for?Control?Plane	Conditional
		Alternative?SGSN?Address?for?User?Traffic	Conditional
Quality?of?Service?Profile	Mandatory
		TFT	Optional
Trigger?Id	Optional
		OMC?Identity	Optional
Private?Extension	Optional

Table 2

Send in the GTP signaling message process at GSN, TYPE C GSN uses amended GTP message, carries the GSN address of two kinds of IP versions and to end communication, realizes the communication with TYPE A GSN.

For example, SGSN uses IPv4/IPv6 to send Create PDP Context Request message to GGSN, when TYPE C GGSN receives Create PDP Context Request message, detect comprise IPv4/IPv6 SGSN Address cell after, this TYPE C GGSN is when making up Create PDPContext Response message, in GGSN Address for Control Plane cell and GGSNAddress for user traffic cell, insert the IPv4/IPv6 address of oneself, in AlternativeGGSN Address for Control Plane cell and Alternative GGSN Address for usertraffic cell, insert the IPv6/IPv4 address of oneself.And after SGSN receives response message from GGSN, SGSN should store the GGSN address, and use one of them set during to GGSN at the G-PDU that sends chain of command GTP signaling and send MS, promptly in GGSN Address and two kinds of addresses of Alternative GGSN Address, select a kind of.

TYPE C GSN is carrying IPv4 and IPv6 address simultaneously in the message when transmitting some GTP signaling message as can be seen, selects to use corresponding IP version with expectation the other side GSN.

But, making in this way, the TYPE C GSN that newly adds network still may exist inter-communicating problem with the TYPE A GSN on the existing network.When TYPE C GSN when TYPE A GSN sends described GTP message, because GTP message is revised, the existing TYPA AGSN of network possibly can't correctly discern these the address cells that increase newly in the described GTP message, thereby can be used as invalid message to described GTP message and abandon, and cause to set up normal communication between the GSN.

For example in activating PDP Context flow process (PDP Context Activation Procedure), after the TYPE ASGSN of not upgrading receives the Create PDP ContextResponse message of TPYE C GGSN, because this message has Alternative GGSN Address for ControlPlane and Alternative GGSN Address for user traffic cell, TYPE A SGSN is if can't identify the address cell of these increases in this GTP message, just may be used as invalid message or error message to this Create PDPContext Response message and abandon, thereby cause activating the failure of PDPContext flow process.

Be understood that this scheme mainly is to lay particular emphasis on solution how to make individual node support GTP overIPv6, just solves an equipment and joins in the IPv4 network, how to realize supporting simultaneously IPv6.This scheme considers that from the aspect of network evolution network evolves to the problem of IPv6, just do not consider when newly-built GPRS core network, foundation be under the situation of pure IPv6 network, the problem of carrying out intercommunication with former IPv4 GPRS core network how.For a newly-built IPv6 GPRS core net, operator can not all adopt TYPE CGSN for the intercommunication that realizes this network and IPv4 GPRS, thereby for newly-built network, such scheme does not almost have implementary value.

When the new pure IPv6 network of building, all GSN of TYPE category-B type in the network, how to realize the intercommunication between pure IPv6 GPRS core net and the pure IPv4 GPRS core net, become the problem that at first will solve.

At present, the scheme that realizes pure IPv6/IPv4 intercommunication comprises: one network address translation-protocol conversion (NAT-PT) equipment is set between two core net.NAT-PT mechanism needs a V4 address pool and a V6 address pool, when communication, to a V6 (V4) address in a V4 (V6) node dynamic assignment V6 (V4) address pool, the source address and the destination address of the head that the IP that NAT-PT equipment uses this addresses distributed modification V4 (V6) node to send wraps are changed.Thereby make and V6 (V4) node of V4 (V6) node communication think it with another node communication of identical address territory network.

But NAT-PT only is a kind of thinking in IP layer conversion, rather than one and the concrete application protocol scheme of moving of combining closely, and iff NAT-PT is arranged, still can't make IPv4 and the intercommunication of IPv6 node.For example, how the IP address in the application layer load should change, and belongs to outside the NAT-PT scope.And for example, when V4 node A and the communication of V6 Node B, NAT-PT should be A and distributes the V6 address, for B distributes the V4 address, in order to realize intercommunication, following 3 problems also are to belong to the problem that the needs outside the NAT-PT scope solve: when (1) triggers NAT-PT is that A/B distributes an address and an original address binding for A/B distribution address and A/B; (2) how purpose being sent at A in the V4 address of distributing to B informs to A before the IPv4 grouping of B; (3) how purpose being sent at B in the V6 address of distributing to A informs to B before the IPv6 grouping of A.Based on the existence of these problems, still can't use NAT-PT simply to realize the intercommunication of IPv6 and IPv4 core net in the GPRS core net.

Summary of the invention

In view of this, main purpose of the present invention is to provide the method and the device of a kind of IPv6 GPRS core net and IPv4GPRS core net interconnecting, makes the intercommunication that realizes IPv6 GPRS core net and IPv4 GPRS core net under the GTP message structure situation not revising.

The method of a kind of IPv6 GPRS core net provided by the invention and IPv4 GPRS core net interconnecting, there is GSN agency, with two core net GSN interactions, the GSN proxy configurations has IPv4 address and IPv6 address, when the source GSN of one core net communicates by letter with the target GSN of another core net, may further comprise the steps:

During the IP address of A, source GSN query aim GSN correspondence, obtain the GSN Agent IP address with the identical IP version of source network, will attempt to issue the up GTP message of purpose GSN and use the encapsulation of source network IP version, send to GSN and act on behalf of;

B, GSN agency receives this GTP message, the GSN address, source in the up GTP message is revised as the address of acting on behalf of with the GSN of the identical IP version of target network; The encapsulation of objective network IP version is used with up GTP message in the IP address of query aim GSN correspondence, sends to the GSN of target network.

Wherein, comprise that further step C, GSN agency is when receiving that target GSN attempts to issue the descending GTP message of source GSN, the GSN address, source of descending GTP message is revised as the address of acting on behalf of with the GSN of the identical IP version of above-mentioned source network, descending GTP message is used described source network IP version encapsulation, send to described source network GSN.

Wherein, be provided with GSN Agent IP address with the identical IP version of source GSN in advance; The described acquisition of steps A comprises with the step of the GSN Agent IP address of the identical IP version of source network: the IP address version of judging target GSN whether with the IP version unanimity of source GSN; When inconsistent, read the GSN Agent IP address that is disposed.

Preferable, the corresponding relation that the Virtual network operator that can further dispose active GSN place identifies, the Virtual network operator at purpose GSN place identifies, reaches described two signs and GSN Agent IP address; The described step that reads the GSN Agent IP address that is disposed comprises: read the corresponding GSN Agent IP address that is disposed according to GSN place, source Virtual network operator sign, purpose GSN place Virtual network operator sign.

Optionally, described pre-configured information stores reads the GSN Agent IP address that is disposed from this source GSN on the GSN of source.

Optionally, described pre-configured information stores is on DNS, and the IP address of described source GSN query aim GSN correspondence is that source GSN obtains to the DNS inquiry; Describedly judge that the IP address version step whether consistent with the IP version of source GSN, that read the GSN Agent IP address that is disposed of target GSN carried out by DNS; DNS also further returns to source GSN with the IP address of reading.

Wherein, activate in the PDP Context flow process, described source GSN is source SGSN, and described target GSN is target GGSN; GSN address, source in the described up GTP message comprises SGSN Addressfor Signalling, SGSN Address for User Traffic; The GSN address, source of described descending GTP message comprises GGSN Address for Control Plane, GGSN Address for User Traffic.

Wherein, more in the new technological process, described source GSN is the new SGSN in source to Inter-SGSN RA, and described target GSN is the old SGSN of target.

Wherein, in the Inter-SGSN SRNS Relocation flow process, described source GSN is the old SGSN in source, and described target GSN is the new SGSN of target.

Wherein, further comprise GSN agency select will with the step of the address of the GGSN of SGSN communication, for: the GSN of the GGSN address forControl Plane representative of GSN agency in the PDP Context that obtains from old SGSN sends inquiry request message, the GGSN address in the PDP Context that request obtains to store among this GSN; If query requests success, the GSN agency fills in the location, GGSN address that will be notified in the PDP Context of new SGSN with the GGSN address that obtains as the GGSN address of selection, indicate new SGSN will with this GGSN communication; If query requests failure, the GSN agency selects another GSN agency to be used for communication between new SGSN and the GGSN, and with selected GSN agency's address as the GGSN address of informing to new SGSN.

Preferable, further comprise: it is MCC and the MNC information that derives in the APN field in IMSI cell or the PDP context cell that described GSN agency selects another GSN agency's foundation, according to the GSN Agent IP address of these information acquisition correspondences.

Optionally, further comprise: the foundation that described GSN agency selects another GSN to act on behalf of is to identify GSN Agent IP addresses selecting two sign correspondences according to new SGSN sign and described GGSN.

Optionally, the GSN agency selects another GSN agency's step to be: this GSN agency selects own to described another GSN agency.

Wherein, in the PDP context activation flow process of network side request, also comprise: be provided with operator sign, corresponding with this sign and GSN Agent IP address source core net identical version in advance; Described acquisition comprises with the step of the GSN Agent IP address of the identical IP version of source network: after the Send Routeing Info for GPRS Request message that HLR reception GGSN sends, the IP address of query aim SGSN, and judge whether the version of this IP address is consistent with the IP version of GGSN belonging network; When inconsistent, the HLR inquiry obtains the GSN Agent IP address identical with the source network IP version, returns to GGSN; After GSN acts on behalf of the PDU Notification Request message that receives from GGSN, ask acquisition to be currently serviced in the address of the SGSN of MS, carry out the communication between this SGSN, the GGSN to HLR.

Wherein, described HLR inquiry obtains the step of the GSN Agent IP address identical with the source network IP version and is: the operator's sign according to described GGSN, SGSN inquires a corresponding GSN Agent IP address of two signs.

The device of a kind of IPv6 and IPv4 GPRS core net interconnecting also is provided, has it is characterized in that, having comprised: Signaling Processing Unit, PDP Context record management unit, GTP-U packet forward unit, name resolution unit; Wherein,

Signaling Processing Unit, the GTP-C message that is used to receive and transmit GSN is carried out signaling process control, and request name resolution unit returns the name corresponding address, the PDP Context record is safeguarded in indication PDP Context record management unit;

PDP Context record management unit is used for storage and organizes the PDP Context record;

GTP-U packet forward unit is used for the PDP Context record according to the storage of PDP Context record management unit, uses suitable IP address to carry out again forwarding after the IP encapsulation to the GTP-U grouping of receiving;

The name resolution unit is used for name is converted to the IP address, perhaps as dns resolution device and outside DNS interactive information.

Wherein, described administrative unit comprises tunnel management unit, mobility management unit; The tunnel management unit, the signaling process of being controlled comprises: PDP context activation flow process, PDP context modification flow process, PDP context deactivation flow process; Mobility management unit, the signaling process of being controlled comprises: Inter-SGSN RA Update flow process, Inter-SGSN SRNS Relocation flow process.

By said method as can be seen, the present invention has realized IPv6 GSN and IPv4 GSN intercommunication, does not revise the structure of GTP message, and therefore not newly-increased cell can not changed existing equipment, has avoided IPv4 equipment not support the situation of IPv6.And by the present invention, operator can remove directly to dispose IPv6-only GSN, lays a good foundation for evolving to pure IPv6 GPRS CN in the future.And, use the present invention, there is not interoperability issue between IPv6 GPRS CN and the IPv4 GPRS CN.

On the other hand, with respect to the NAT-PT technology, method provided by the invention does not exist for the process of IPv4SGSN dynamic assignment IPv6 address, do not exist for the process of IPv6 GGSN dynamic assignment Ipv4 address yet, do not need an Ipv4 address pool and an Ipv6 address pool certainly yet.For SGSN, the selected GSN Proxy of SGSN is an entity the same with common GGSN among the present invention; For GGSN, initiatively the GSN Proxy with its contact is an entity the same with common SGSN.

GSN agency provided by the invention realizes the intercommunication of Ipv4 and Ipv6 network, by dispose GSN agency's mode in network, does not need to upgrade former core net existing device, therefore can not influence original network.

Description of drawings

Fig. 1 is IPv6 GSN and IPv4 GSN intercommunication networking schematic diagram.

Fig. 2 is for activating the PDP Context flow chart.

Fig. 3 upgrades flow chart for Inter-SGSN RA.

Fig. 4 is the schematic diagram of communicating by letter with GGSN that relates in the SGSN flow process.

Fig. 5 is an Inter-SGSN SRNS Relocation flow chart.

Fig. 6 is the PDP context activation flow chart of network side request.

Fig. 7 is GSN proxy construction figure of the present invention.

Embodiment

Networking diagram as shown in Figure 1, the present invention is provided with the device of an IPv6 and IPv4 GPRS core net interconnecting between IPv6 GPRS CN and IPv4 GPRS CN, and the present invention is called GSN agency (GSNProxy), respectively with the GSN interaction of two GPRS core net.GSN Proxy has IPv4 address and IPv6 address, has both supported GTP over IPv6, also supports GTP over IPv4, and starts monitoring simultaneously on two kinds of addresses, prepares to receive the GTP message from two GPRS core net.From network configuration,, the GSN Proxy that is between SGSN and the GGSN can be called S-G GSN Proxy as Fig. 1; The GSN Proxy that will be between SGSN and the SGSN is called S-S GSNProxy.And in realization, S-G GSN Proxy and S-SGSN Proxy can be identical product.The GSN of two GSN core net communicates by GSN Proxy.

Referring to drawings and Examples, the method for IPv6 GPRS CN of the present invention and IPv4 GPRS CN intercommunication is elaborated.

At first, with reference to Fig. 2, be that example describes with the successful activation PDP Context flow process (PDPcontext Activation Procedure) that has GSN Proxy to participate in, may further comprise the steps:

Step 201:MS sends Activate PDP Context Request (activating the PDP Context request) and sends to SGSN, and this message comprises the APN sign.

Step 202:SGSN is converted to GGSN IP address to APN, and typically, SGSN inquires about DNS (domain name system) to obtain GGSN IP address according to APN.In the pairing GGSN of APN is in GPRS CN with SGSN different IP version, SGSN will obtain IP S-G GSN Proxy, identical with its IP version address.For example, when SGSN is among the IPv4 GPRS CN, and the pairing GGSN of the APN address of DNS storage is IPv6 address (GGSN is among the IPv6 GPRS CN), and this SGSN will obtain the IPv4 address of S-G GSN Proxy.

Wherein, SGSN obtains the method for S-G GSN Proxy IP address, according to concrete actual conditions, following several mode can be arranged:

M1 scheme one:

The corresponding relation of configuration operator sign and GSN Proxy IP address list on DNS1, operator's sign is derived by MCC and MNC, and the GPRS CN at the IP address of the GSN Proxy that stores in the address list of DNS1 and DNS1 place is identical.

SGSN sends the DNS recursive query and gives local name server DNS1, and when name server DNS1 is not the authoritative server of name, it can inquire about other name servers, to obtain the address of this domain name.

Then, DNS1 judges whether the version of the IP address that obtains is consistent with the IP version of belonging network.As being among the IPv6 GPRS CN as name server DNS1, it judges whether the GGSN address that inquires is the IPv4 address, if IPv4 address, identify the IPv6 address that obtains GSN Proxy as search index with the operator in the name, then the IPv6 address of GSN Proxy is returned to SGSN.

M2 scheme two:

SGSN sends the DNS recursive query and gives local name server DNS1, and when name server DNS1 is not the authoritative server of name, it can inquire about " .gprs " root name character server DNS2, to obtain the address of this domain name.

DNS2 judges according to the sign of the operator in the name GPRS CN of the operator of this name of administration has been to use the IP of which kind of version.Inconsistent when the IP version of the GPRS CN version of operator of this APN of administration and the GPRS CN under the DNS1, DNS2 returns the IP address of GSN Proxy and gives DNS1, and the version of this IP address is identical with the IP version of SGSN address.The address of GSN Proxy will be returned to SGSN by DNS1.

Wherein, on the root name character server, the corresponding relation of operator's sign and IP version, GSN Proxy address list can dispose.

The IP version of GPRS CN under GPRS CN version and the DNS1 of the operator of this APN of administration is consistent, and the behavior of DNS2 will be the same with existing way, and what final DNS1 obtained is the IP address of target GGSN.

M3 scheme three:

SGSN sends the DNS recursive query and gives local name server DNS1, and DNS1 judges according to the sign of the operator in the name GPRS CN of the operator of this name of administration has been to use the IP of which kind of version.Inconsistent when the IP version of the GPRS CN version of operator of this name of administration and the GPRS CN under the DNS1, DNS1 returns the IP address of GSN Proxy and gives SGSN, and the version of this IP address is identical with the IP version of SGSN address.

Wherein the corresponding relation of operator's sign and IP version, GSN Proxy address can dispose.

The IP version of GPRS CN under GPRS CN version and the DNS1 of the operator of this APN of administration is consistent, and the behavior of DNS1 will be as existing way, and what finally DNS1 obtained is the IP address of target GGSN, and the address is returned to SGSN.

M4 scheme four:

SGSN attempts obtaining the IP address of GSN Proxy according to operator's sign, if fail, then attempts obtaining the IP address of GGSN as existing way.A specific implementation is: dispose the record of the corresponding relation of operator's sign that MNC, MCC constitute and GSN Proxy IP address on SGSN, index field is operator's sign.SGSN is according to operator's sign inquiry, and successful inquiring then obtains GSN Proxy IP address; If the inquiry failure, then SGSN initiates the DNS request, to obtain real GGSN IP address.

Source SGSN has obtained the method for the address of GSN Proxy may be various, for example, the Virtual network operator that also can dispose active SGSN place on DNS identifies, the Virtual network operator at purpose GGSN place identifies, reaches a corresponding GSN Proxy IP address list of described two signs, and inquires about acquisition GSN Proxy in view of the above.From the entity of the realization of query function, its realization can be a DNS entity, also can be that root DNSname server and local dns name server realize, also can be to be configured realization on GSN.

Step 203:SGSN is used as the S-G GSN Proxy that obtains as GGSN, sends Create PDP Context Request (generating the PDP Context request) to S-G GSN Proxy.Wherein, this GTP message uses the IP version of SGSN place network to encapsulate, and encapsulates this GTP message as using IPv4 in this example.

After step 204～205:S-G GSN Proxy receives Create PDP Context Request message, S-G GSN Proxy can be converted to the GGSN address to name, use therein name is the APN that carries among the Create PDPContext Request, typically, S-G GSN Proxy sends the address that the DNS inquiry obtains GGSN.

Then, S-G GSN Proxy record from the Create PDP Context Request message that SGSN receives SGSN Address for Signalling and the value (IP address) of SGSN Address for User Traffic, S-G GSN Proxy record SGSN address is to be used in the back flow process to know which SGSN is message returned to.

Then, use and the address of the identical IP version of GGSN the address that S-G GSN Proxy is revised as S-GGSN Proxy oneself to the SGSNAddress for Signalling in the Create PDP Context Request message and these two values of SGSN Address for User Traffic, these addresses.Use the IP version encapsulation Create PDP Context Request message of GGSN place network, and issue the GGSN that its inquiry obtains.

Step 206:GGSN receives Create PDP Context Request message, and after the analyzing and processing message, S-G GSN Proxy is used as SGSN, makes up Create PDP Context Response (generating the PDP Context response) and send back to S-G GSN Proxy.

After step 207～208:S-G GSN Proxy receives Create PDP Context Response message, S-G GSN Proxy can create the PDP Context record, be convenient to explanation, herein with several different content that is write down, corresponding being expressed as is recorded in different R0, R1, the R2 record no longer explanation later on.In this step the PDP Context of creating is recorded into R0, the value of record GGSNAddress for Control Plane field and GGSN Address for User traffic field is respectively GGSN Address for Control Plane in the Create PDP Context Response message and the value of GGSN Address for User Traffic among the R0.

Then, S-G GSN Proxy revises the address of the value of GGSN Address for Control Plane in the Create PDP Context Response message that GGSN sends and GGSN Address for User Traffic for oneself.Wherein, the IP version of the S-G GSN Proxy address of filling in is identical with SGSN.

Then, S-G GSN Proxy uses and the IP of SGSN identical version encapsulates this GTP message, and issues SGSN.

After step 209:SGSN receives Create PDP Context Response, create the PDP Context record, the IP address of GGSN Address for Control Plane that wherein comprises and GGSN Address forUser Traffic cell is the address of S-G GSN Proxy.SGSN also makes up ActivatePDP Context Accept (activate PDP Context response) and replies to MS.

After PDP context activation process successfully finished, SGSN can be used as GGSN to S-G GSN Proxy and treat, and GGSN can be used as SGSN to S-G GSN Proxy and treats, and realized communication between the different IP version GPRS CN by S-G GSNProxy.S-G GSN Proxy stores and is dissolved in this PDP Context among the record R0.The index field of R0 can be IMSI+NSAPI, for the GTPv1PDP context, also has another index TEID.The chain of command of this PDP Context use and SGSN IP address, GGSN IP address and the S-G GSN Proxy IP address of user's face have been write down among the R0.And when PDP context deexcitation flow process finished, R0 was with deleted.

Similar with the PDP context activation flow process, in PDP context modification process (PDP ContextModification Proeedure) and PDP context deexcitation flow process (PDP Context DeactivationProcedure) lining, the SGSN of different IP version and GGSN carry out interactive information by S-G GSN Proxy.The SGSN Address that S-G GSN Proxy will revise in the message that SGSN sends is oneself address, issues GGSN after using identical IP version with GGSN to encapsulate this GTP message.Equally, the GGSN Address that S-G GSN Proxy will revise in the message that GGSN sends is oneself address, issues SGSN after using identical IP version with SGSN to encapsulate this GTP message.Up GTP-U grouping will be issued S-G GSN Proxy by SGSN, and S-G GSN Proxy encapsulates GTP-U again with identical IP version with GGSN, use the source address of the address of oneself as the IP head, be transmitted to GGSN again.Descending GTP-U grouping will be issued S-G GSN Proxy by GGSN, and S-G GSN Proxy encapsulates GTP-U again with identical IP version with SGSN, use the source address of the address of oneself as the IP head, be transmitted to SGSN again.

Below mainly described the communication process of GTP message, in communication, GTP message is encapsulated in the IP bag to be transmitted, and convenient for what describe, the encapsulation of above-mentioned IP layer is not described in detail.But be understood that, when above-mentioned two entities transmit the IP bag that is packaged with GTP message, receiving entity and sending entity that the destination address of IP bag and source address correspond respectively to GTP message.About this point, hereinafter no longer explanation.

Refer again to Fig. 3 below, with have successful Inter-SGSN RA that GSN Proxy participates in more new technological process (Inter-SGSN RA update Procedure) be that example describes, may further comprise the steps:

Step 301:MS initiates RA Update Request message and gives new SGSN (new SGSN), and this message comprises old RAI (old RAI) sign.

Step 302:New SGSN will construct the RAI logical name according to old RAI, obtain the IP address of old SGSN (old SGSN) according to RAI logical name inquiry DNS.The IP version of GPRS CN under the GPRS CN under the old SGSN and new SGSN is different, then new SGSN will obtain S-S GSN Proxy, with the address of the identical IP version of new SGSN, and S-S GSNProxy is used as old SGSN.Wherein, the method that new SGSN obtains the IP address of S-S GSN Proxy has several selections, specifically can be referring to the M1 scheme 1～M4 scheme 4 described in the above-mentioned steps 202, and what use when just inquiring about DNS is the RAI logical name, rather than APN.

Then, New SGSN is used as the S-S GSN Proxy that obtains as old SGSN, uses the IP version encapsulation SGSN Context Request message of newSGSN, and sends to S-S GSN Proxy.

After step 303:S-S GSN Proxy receives SGSN Context Request message, the SGSN address forControl Plane cell among the SGSN Context Request is revised in the address of S-S GSNProxy use oneself, and the IP version of these addresses is identical with the IP version that Old SGSN uses.

Then, use the IP version encapsulation SGSN Context Request message of old SGSN, and send to old SGSN.

The address of S-S GSN Proxy storage new SGSN is in the record R1 that creates, and the index field of R1 is IMSI.And startup timer T1.T1 also can start when receiving SGSN Context Response or SGSN Context Acknowledge step.

Step 304:old SGSN receives SGSN Context Request, makes up SGSN ContextResponse message and returns to S-S GSN Proxy.Old SGSN will be used as newSGSN to GSN Proxy.

After step 305:S-S GSN Proxy receives SGSN Context Response message, the IP version of judging the IP version of GGSN address for ControlPlane and GGSN address for User traffic field in the PDP context cell of this GTP message and the residing GPRS CN of new SGSN as S-SGSN Proxy is inconsistent, and it will be reselected the GGSN address and revise GGSN address for Control Plane and the GGSN address forUser traffic field that comprises in the PDPcontext cell in the message.When GGSN address field IP version is consistent with the IP version of the residing GPRS CN of newSGSN among the PDP context that judges, then do not revise the content of these fields.

That use as old SGSN is common GGSN, and then new SGSN and GGSN need S-GGSN Proxy alternately; Used S-G GSN Proxy between old SGSN and common GGSN, then newSGSN can be directly mutual with GGSN.But whether the IP address that needs S-S GSN Proxy to identify described GGSN address field is the address of common GGSN, a way is that S-S GSN Proxy removes to sound out this GGSN of inquiry, because standard GGSN does not support this inquiry, and S-G GSNProxy is support and address that can return common GGSN, therefore, as long as can successful inquiring, illustrate that then the IP of GGSN address field record is the GSN agent address, otherwise be the address of common GGSN.Specifically referring to the detailed description that contrasts Fig. 4 hereinafter.

Then, S-S GSN Proxy uses own IP address to fill in SGSN address for Control Plane field among the SGSN Context Response, and the IP version of use new SGSN is issued new SGSN after encapsulating this GTP message.

Be dissolved among the record R2 of establishment in the PDP Context among the S-S GSN Proxy storage SGSN Context Response, content comprises fields such as IMSI.The index field of R2 is IMSI+NSAPI, and for GTP v1 PDP Context, also having an index field is TEID.R1 also can merge among the R2, promptly all stores new SGSN address about each R2 record of a MS.

Can be referring to Fig. 4.Wherein, S-S GSN Proxy selects the method for GGSN address to be:

S-S GSN Proxy sends inquiry request message to the GSN (being designated as G) of GGSN address for Control Plane representative, with the GGSNaddress that uses among the PDP context that obtains to store among the GSN.Querying flow can be used SSGN Context Request-Response-Ack message and realize.

If query requests success, show that then G is that a S-G GSN Proxy is (referring to above-mentioned steps 207, in GSN Proxy, can store real GGSN address), and then illustrate that old SGSN and purpose GGSN belong to different IP version network, communicate by this S-G GSN Proxy, and because old SGSN and new SGSN belong to different IP version network, so deriving GGSN belongs to identical IP version network with new SGSN, so the S-S GSN Proxy GGSN address notification new SGSN of the real GGSNaddress of acquisition as selection, new SGSN is with this GGSN communication direct and acquisition in the future.

If query requests failure, for example G can not support to handle this request message and cause S-S GSNProxy wait-for-response overtime, illustrate that then G is a common GGSN, old SGSN and this GGSN are at same IP version network, between do not have S-G GSN Proxy, again because new SGSN and old SGSN belong to different IP version network, so new SGSN belongs to different IP version network with this GGSN, between S-G GSN Proxy of needs during information interaction.Then, S-S GSN Proxy selects a S-G SGSN Proxy with as the intermediary between new SGSN and the GGSN, and the address of using S-GSGSN Proxy is as the GGSN address of informing to new SGSN.

Wherein, to select the foundation of a S-G GSN Proxy be MCC and the MNC information that derives in the APN field in the PDP context cell of IMSI cell or SGSN Context Response message to S-S GSN Proxy.Promptly utilize MCC and MNC to obtain the IP address of S-G GSN Proxy.

S-S GSN Proxy selects another better way of a S-G GSN Proxy to be, derives them from the IP address of SGSN/GGSN and belongs to which network and operator's sign thereof separately, selects which S-G GSN Proxy according to these information decisions again.For example, configuration SGSN/GGSN both sides operator identifies pairing S-G GSN Proxy address list, and S-S GSN Proxy obtains S-G GSN Proxy address according to the sign inquiry of both sides operator.

Wherein, S-S GSN Proxy selects the simple designs of S-G GSN Proxy to be: this S-SGSN Proxy oneself is as the S-G GSN Proxy between new SGSN and the GGSN.

This design may form S-G GSN Proxy chain after having prevented from repeatedly to switch.For example the communication path between oldSGSN and the GGSN is: Old SGSN-S-G GSN Proxy#1-GGSN, after the switching, if new SGSN is different with the IP version of S-G GSN Proxy#1, but the IP version of S-G GSNProxy#1 is identical with the GGSN IP version, can not need to use S-G GSN Proxy#1 when new SGSN and GGSN communication.If do not eliminate S-G GSN Proxy#1, after then switching next time, the communication path between new SGSN and the GGSN is new SGSN-S-G GSN Proxy#2-S-G GSN Proxy#1-GGSN.If eliminate,, need S-GGSN Proxy#1 to tell new SGSN the address of GGSN then according to top method.

Step 306:new SGSN receives SGSN Context Response, writes down the GGSN address in this GTP message.And SGSN Context Acknowledge response message is sent to S-SGSN Proxy.

Step 307: when S-S GSN Proxy receives SGSN Context Acknowledge, the SGSN Address for User Traffic cell of SGSN Context Acknowledge is filled in the address with the identical IP version of old SGSN of its use oneself, and gives old SGSN forwards.

Step 308: when old SGSN receives SGSN Context Acknowledge, it divides into groups the GTP-U of forwarding cache to S-S GSN Proxy.Divide into groups when S-S GSN Proxy receives GTP-U, it is according to the information acquisition new SGSN address in the GTP head.The method that obtains is, for GTP v1 grouping, utilizes TEID field search R2 tabulation, obtains IMSI, utilizes IMSI retrieval R1 tabulation to obtain new SGSN address then.For GTP v0 grouping, from the TEID field, obtain IMSI, utilize IMSI retrieval R1 tabulation to obtain new SGSN address then.

The IP version encapsulation that S-S GSN Proxy uses GTP-U grouping instead new SGSN, the source address of filling in the IP head with the address of oneself is filled in the destination address of IP head with new SGSN address, then they is transmitted to new SGSN.Overtime as T1, R1 and R2 record about this MS among the S-S GSN Proxy are deleted.

From this, to carry out information interaction follow-up for the S-S GSN Proxy that passes through between this old SGSN and the new SGSN, when new SGSN and GGSN are mutual, can carry out information interaction with the GGSN address of record in the step 306.When the GGSN address of record was GSN Proxy address, GSN Proxy can realize the communication between new SGSN and the real GGSN.

Top Inter-SGSN RA update Procedure flow process is that new SGSN initiatively initiates the communication of GTP Signalling exchange to old SGSN, when the present invention is applied in the Inter-SGSN SRNS Relocation flow process, then be that old SGSN at first initiates communication to new SGSN.Describe below with reference to Fig. 5, may further comprise the steps:

Step 501: source RNC sends Relocation Required message and gives old SGSN (oldSGSN), and this message carries Target RNC sign (target ID).

Step 502:old SGSN constructs the RNC logical name by target ID, and inquiry DNS obtains the address of the new SGSN (new SGSN) of RNC logical name correspondence.The IP version of GPRS CN under the GPRS CN under the old SGSN and new SGSN is different, and then old SGSN will obtain the IP address of S-S GSN Proxy, and old SGSN can be used as new SGSN to GSN Proxy.Wherein, the method that old SGSN obtains the IP address of S-S GSN Proxy has several selections, specifically can be referring to the M1 scheme 1～M4 scheme 4 described in the above-mentioned steps 202, but the query name of using is the RNC logical name by the APN replacement.

Old SGSN makes up the new SGSN that Forward Relocation Request message is issued the IP address representative of acquisition.When the IP address is the address of S-S GSN Proxy, then message will be issued S-S GSNProxy, and old SGSN will be used as new SGSN to it.

Step 503:S-S GSN Proxy receives Forward Relocation Request message, and it uses the inquiry of RNC logical name to obtain new SGSN.

And, S-S GSN Proxy checks GGSNAddress for Control Plane and the GGSN Address for User traffic field that comprises in the PDP context cell in the message, inconsistent when the IP version of the IP version of judging these GGSN addresses and the residing GPRS CN of new SGSN, it should be reselected the GGSN address and revise GGSNaddress for Control Plane and the GGSN address for User traffic field that comprises in the PDP context cell in the message.(S-S GSNProxy selects the way of GGSN address referring to above-mentioned steps 305)

Then, S-S GSN Proxy fills in SGSN address for Control Plane among the Forward Relocation Request with own address, and the IP version of use new SGSN is issued new SGSN after encapsulating this GTP message.

Step 504:new SGSN receives Forward Relocation Request message, will be used as Old SGSN to S-SGSN Proxy.New SGSN will be used as common GGSN to the S-GGSN Proxy of GGSN Address representative in the message.

New SGSN and Target RNC (Target RNC) set up RAB.Make up ForwardRelocation Response message then and return to S-S GSN Proxy.

Step 505:S-S GSN Proxy receives Forward Relocation Response, it revise SGSN Address for Control Plane cell value among the Forward Relocation Response be oneself with the address of the identical IP version of Old SGSN, and the IP version of use old SGSN is issued old SGSN after encapsulating this GTP message.

In follow-up flow process, still use this GSN Proxy to realize communication between new SGSN and the old SGSN, just no longer be repeated in this description.And, when new SGSN when GGSN initiates Update PDPContext Request message, the GGSN that S-S GSN Proxy reselects in step 503 initiates this GTP message, this process is identical with example 3, when this GGSN is a S-G GSN Proxy, realize new SGSN and true communicating by letter between the GGSN by it.

Again for example, in Combined Hard Handover and SRNS Relocation Procedure, when Old SGSN receives RANAP message Forward SRNS Context, Old SGSN should send the GSN of Forward SRNS Context message to the SGSN Address for Control Plane representative of precedence record, i.e. S-S GSN Proxy.

When S-S GSN Proxy receives Forward SRNS Context message, will be with filling in the IP head of carrying GTP with the address of the identical IP version of new SGSN, and give new SGSN this forwards.When S-S GSN Proxy receives the Forward SRNS Context Ack that new SGSN sends, will give old SGSN this forwards with filling in the IP head that carries GTP with the address of the identical IP version of old SGSN.

Again referring to Fig. 6, carry out the present invention is further described below with the PDP context activation flow process of network side request.In this flow process, similar to the above process substantially, just be to come replacement query DNS here by inquiry HLR.

In the PDP context activation flow process of network side request, inconsistent when the IP version of the SGSN at the IP version of GGSN and MS place, what then GGSN should obtain is the IP address of S-G GSN Proxy.The method of the IP address of GGSN acquisition S-G GSN Proxy is as follows:

When HLR receives the Send Routeing Info for GPRS Request that GGSN sends, whether the IP version of the SGSN address of inspection record and GGSN address is consistent, if inconsistent, then return the IP address of S-G GSN Proxy.This IP address version is identical with GGSN.

Then, GGSN can issue S-G GSN Proxy to PDU Notification Request.

Then, S-G GSN Proxy receives PDU Notification Request, and it sends the IP address that Send Routeing Info for GPRS Request acquisition is currently serviced in the SGSN of MS to HLR.

Then, S-G GSN Proxy uses mutual with the address and the SGSN of the identical IP version of SGSN.Comprise that S-G GSN Proxy transmits PDU Notification Request to SGSN, wherein, the address that the value of GGSNAddress for Control Plane field is revised as S-G GSN Proxy, IP source address extends this as the address of GSN Proxy.

Afterwards, MS can initiatively activate PDP context, and in this activation process, the S-G GSN Proxy that SGSN selects can be other GSN Proxy, because the original position of S-G GSN Proxy on the network route may be not good.

Accordingly, the present invention also provides the GSN agent apparatus.GSN agent apparatus structure chart as shown in Figure 7 comprises Signaling Processing Unit, PDP Context record management unit, GTP-U packet forward unit, name resolution unit.Explanation respectively below:

Signaling Processing Unit is used for handling the GTP message flow, promptly receives and transmit GTP-C message, indication PDP Context record management unit writes down (as R0 PDP Context, R1 R2) carries out data base administration, and the name corresponding address is returned in the unit inquiry of request name resolution.Can think that Signaling Processing Unit mainly is the processing of carrying out the chain of command signaling message.According to what realize is G-G GSN Proxy or S-G GSN Proxy, and Signaling Processing Unit can be divided into tunnel management unit and mobility management unit.

Following flow process can be handled in the tunnel management unit: the PDP context activation flow process, the PDP context activation flow process (optional) of network side request, the PDP context modification flow process that MS/SGSN/GGSN initiates, the PDP context deactivation flow process that MS/SGSN/GGSN initiates.The main demand signalling of handling comprises: activate the PDP Context request, upgrade the PDP Context request, the request of deletion PDP Context, PDUNotification Request.

In the activation PDP Context flow process of success, can order PDP Context record management unit to create the PDP Context record.In the renewal PDP Context flow process of success, can order PDP Context record management unit to upgrade the PDP Context record.In deletion PDP Context flow process, can order PDP Context record management element deletion PDP Context record.In the PDP context activation flow process of network side request, S-G GSN Proxy can obtain the address of SGSN to the HLR request.

And SRNS is redirected between flow process and SGSN more new technological process of RA between mobility management unit treatment S GSN.On stream, select suitable GGSN IP address or S-G GSN Proxy IP address to fill in GGSN IP address in the PDP Context of issuing new SGSN according to situation.Order PDP Context Data Management Unit is created, deletion PDP Context record.

PDP Context record management unit is used for PDP context record is carried out storage administration, and the PDP Context record field comprises PDP Context sign etc.The interface that this unit externally provides comprises: write down according to PDP Context sign retrieval PDP context etc.The R0 that mentions in specification, R1, R2 information also are stored in this administrative unit.

GTP-U packet forward unit, for the GTP-U grouping from SGSN/GGSN of receiving, search the PDP Context record to the request of PDP Context Data Management Unit, information during the PDP Context that uses the PDP Context Data Management Unit to store writes down is revised grouping, after using suitable IP address to carry out the IP encapsulation again, be transmitted to GGSN/SGSN.

For example GSN realize be S-G GSN agent functionality the time, for grouping, be source address modification the IP address of S-G GSN Proxy from SGSN, destination address is revised as GGSN IP address.For GTP-U message from GGSN, be source address modification the IP address of S-G GSN Proxy, destination address is revised as SGSN IP address, to carry out the forwarding of GTP-U message.

And GSN realize be S-S GSN agent functionality the time, for the GTP-U grouping from old SGSN of receiving, search the PDP Context record to the PDP Context Data Management Unit, use the information in the PDP Context record to revise grouping, and be transmitted to new SGSN.Specifically, for GTP-U grouping from old SGSN.Is source address modification the IP address of S-S GSN Proxy, the IP address of destination address being revised as new SGSN.

Be understood that if Signaling Processing Unit above-mentioned is thought to handle GTP-C message to carry out the control of Signaling Layer, then GTP-U packet forward unit can be regarded as and is used for the client layer forwarding of data.Need to prove, in Inter-SGSN SRNS Relocation flow process, can not use the GTP-U retransmission unit.

The name resolution unit is responsible for name is converted to the IP address.And when using DNS, the name resolution unit comprises making up the DNS request message and resolving the DNS response message of receiving as dns resolution device and outside DNS interactive information, carries out DNS querying flow and buffer memory domain name mapping outcome record.

For example, in activating the PDP Context flow process, GTP tunnel management unit requests name resolution unit returns the domain name mapping result.SRNS is redirected between flow process and SGSN RA more in the new technological process between SGSN, and if necessary, mobility management unit can ask the name resolution unit to return the domain name mapping result.

The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (17)

1. the method for IPv6 GPRS core net and IPv4 GPRS core net interconnecting, it is characterized in that, there is GSN agency, with two core net GSN interactions, the GSN proxy configurations has IPv4 address and IPv6 address, when the source GSN of one core net communicates by letter with the target GSN of another core net, may further comprise the steps:

During the IP address of A, source GSN query aim GSN correspondence, obtain the GSN Agent IP address with the identical IP version of source network, will attempt to issue the up GTP message of target GSN and use the encapsulation of source network IP version, send to GSN and act on behalf of;

B, GSN agency receives this GTP message, the GSN address, source in the up GTP message is revised as the address of acting on behalf of with the GSN of the identical IP version of target network;

The encapsulation of objective network IP version is used with up GTP message in the IP address of query aim GSN correspondence, sends to target GSN.

2. method according to claim 1 is characterized in that, further comprises step behind the step B:

C, GSN agency is when receiving that target GSN attempts to issue the descending GTP message of source GSN, the GSN address, source of descending GTP message is revised as the address of acting on behalf of with the GSN of the identical IP version of above-mentioned source network, descending GTP message is used described source network IP version encapsulation, send to source GSN.

3. method according to claim 1 is characterized in that, is provided with the GSN Agent IP address with the identical IP version of source GSN in advance; The described acquisition of steps A comprises with the step of the GSN Agent IP address of the identical IP version of source network:

Whether the IP address version of judging target GSN is consistent with the IP version of source GSN; When inconsistent, read the GSN Agent IP address that is disposed.

4. method according to claim 3 is characterized in that, the corresponding relation that the Virtual network operator that further disposes active GSN place identifies, the Virtual network operator at target GSN place identifies, reaches described two signs and GSN Agent IP address;

The described step that reads the GSN Agent IP address that is disposed comprises: read the corresponding GSN Agent IP address that is disposed according to GSN place, source Virtual network operator sign, target GSN place Virtual network operator sign.

5. according to claim 3 or 4 described methods, it is characterized in that described configuration store reads the GSN Agent IP address that is disposed from this source GSN on the GSN of source.

6. according to claim 3 or 4 described methods, it is characterized in that described configuration store is on DNS, the IP address of described source GSN query aim GSN correspondence is that source GSN obtains to the DNS inquiry;

Describedly judge that the IP address version step whether consistent with the IP version of source GSN, that read the GSN Agent IP address that is disposed of target GSN carried out by DNS; DNS also further returns to source GSN with the IP address of reading.

7. method according to claim 2 is characterized in that, activates in the PDP Context flow process, and described source GSN is source SGSN, and described target GSN is target GGSN; GSN address, source in the described up GTP message comprises SGSN Address for Signalling, SGSN Address for UserTraffic; The GSN address, source of described descending GTP message comprises GGSN Address for ControlPlane, GGSN Address for User Traffic.

8. method according to claim 1 is characterized in that, more in the new technological process, described source GSN is the new SGSN in source to Inter-SGSN RA, and described target GSN is the old SGSN of target.

9. method according to claim 1 is characterized in that, in the Inter-SGSN SRNSRelocation flow process, described source GSN is the old SGSN in source, and described target GSN is the new SGSN of target.

10. according to Claim 8 or 9 described methods, it is characterized in that, further comprise the GSN agency select will with the step of the address of the GGSN of SGSN communication, for:

The GSN of the GGSN address forControl Plane representative of GSN agency in the PDP Context that obtains from old SGSN sends inquiry request message, the GGSN address in the PDP Context that request obtains to store among this GSN;

If query requests success, the GSN agency fills in the location, GGSN address that will be notified in the PDP Context of new SGSN with the GGSN address that obtains as the GGSN address of selection, indicate new SGSN will with this GGSN communication;

If query requests failure, the GSN agency selects another GSN agency, is used for the communication between new SGSN and the GGSN, and with selected GSN agency's address as the GGSN address of informing to new SGSN.

11. method according to claim 10, it is characterized in that, further comprise: described GSN agency selects another GSN agency's step to comprise: according to MCC that derives in the APN field in IMSI cell or the PDP Context cell and MNC information, according to the GSN Agent IP address of these information acquisition correspondences.

12. method according to claim 10 is characterized in that, further comprises: described GSN acts on behalf of and selects another GSN agency's step to comprise: identify GSN Agent IP addresses selecting two sign correspondences according to new SGSN sign and described GGSN.

13. method according to claim 10 is characterized in that, described GSN agency selects another GSN agency's step to comprise: this GSN agency selects own to described another GSN agency.

14. method according to claim 1 is characterized in that, in the PDP context activation flow process of network side request, described source GSN is GGSN, and target GSN is a target SGSN; Also comprise: be provided with operator sign, corresponding with this sign and GSN Agent IP address source core net identical version in advance;

Described acquisition comprises with the step of the GSN Agent IP address of the identical IP version of source network: after the Send Routeing Info for GPRS Request message that HLR reception GGSN sends, the IP address of query aim SGSN, and judge whether the version of this IP address is consistent with the IP version of GGSN belonging network; When inconsistent, the HLR inquiry obtains the GSN Agent IP address identical with the source network IP version, returns to GGSN;

The IP address step of described query aim GSN correspondence comprises: after GSN acts on behalf of the PDU Notification Request message that receives from GGSN, be currently serviced in the address of the target SGSN of MS to HLR request acquisition.

15. method according to claim 14, it is characterized in that the step that described HLR inquiry obtains the GSN Agent IP address identical with the source network IP version comprises: the operator's sign according to described GGSN, SGSN inquires a corresponding GSN Agent IP address of two signs.

16. the device of IPv6 and IPv4 GPRS core net interconnecting is characterized in that, comprising: Signaling Processing Unit, PDP Context record management unit, GTP-U packet forward unit, name resolution unit; Wherein,

Signaling Processing Unit, the GTP-C message that is used to receive and transmit GSN is carried out signaling process control, and request name resolution unit returns the name corresponding address, the PDP Context record is safeguarded in indication PDP Context record management unit;

PDP Context record management unit is used for storage and organizes the PDP Context record;

GTP-U packet forward unit is used for the PDP Context record according to the storage of PDP Context record management unit, uses suitable IP address to carry out again forwarding after the IP encapsulation to the GTP-U grouping of receiving;

The name resolution unit is used for name is converted to the IP address, perhaps as dns resolution device and outside DNS interactive information.

17. device according to claim 16 is characterized in that, described PDP Context record management unit comprises tunnel management unit, mobility management unit; Wherein,

The tunnel management unit, the signaling process of being controlled comprises: PDP context activation flow process, PDP context modification flow process, PDP context deactivation flow process;

Mobility management unit, the signaling process of being controlled comprises: Inter-SGSN RA Update flow process, Inter-SGSN SRNS Relocation flow process.

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