CN101808101A

CN101808101A - Communication method, device and system between sub networks

Info

Publication number: CN101808101A
Application number: CN 201010151114
Authority: CN
Inventors: 杨胜强
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2010-04-20
Filing date: 2010-04-20
Publication date: 2010-08-18
Anticipated expiration: 2030-04-20
Also published as: CN101808101B

Abstract

The embodiment of the invention discloses a communication method, a device and a system between sub networks, which relate to the field of communication. In order to improving the experience quality of customers only using non-IMS network business in the network with the coexistence of the IMS network and the traditional network, the invention provides the technical scheme that the method comprises the following steps: receiving business request information sent by a first gateway connected with the first sub network; respectively obtaining the external interface types of the first sub network and the second sub network; and respectively sending direct transmission indication information to the first gateway or the second gateway connected with the second sub network to be used for obtaining mutual direct transmission channels of the communication business by the first gateway and the second gateway according to the direct transmission indication information when that the communication business of the first sub network and the second sub network is the non-IMS network business is determined and that the external interface types of the first sub network and the second sub network are identical is determined. The invention is applicable to the IMS network communication.

Description

Communication means between subnet, Apparatus and system

Technical field

The present invention relates to the communications field, relate in particular to communication means, Apparatus and system between a kind of subnet.

Background technology

Along with development of telecom technology, IMS (IP Multimedia Subsystem, IP multimedia system, the network protocol multi-media system) network that transmits based on all-IP (Internet Protocol, procotol) can replace legacy network gradually.Because the replacement process will be the process of a very long progressively evolution, the IMS network can with legacy network long-term co-existence.Based on cost, income and each side factor such as operation risk etc., with the core network of IMS network as operator, and with other legacy network as subnet, communication is through the unified control of IMS network between all-ones subnet.

Below with PSTN (Public Switched Telephone Network, PSTN) customer call CDMA (Code Division Multiple Access, code division multiple access) user is an example, in the communication process between current sub network, calling control that the IMS network carries out and the method that connects describe.This method is specially: IMS gateway 1 is resolved PSTN incoming call request message after receiving calling subscriber's PSTN incoming call request message, and the adaptive IMS call setup message that is converted to, and issues CN (CoreNetwork, core net) and handles; CN returns IMS call setup response message to IMS gateway 1 after carrying out the control of calling subscriber's call session; IMS gateway 1 returns the adaptive PSTN call setup response message that is converted to of IMS call setup response message to the PSTN network, finishes continuing between IMS network and the PSTN network; CN carries out route according to the called subscriber, sends IMS exhalation request message to IMS gateway 2; IMS gateway 2 is issued cdma network with the IMS adaptive CDMA of the being converted to exhalation of the request message request message of breathing out; Cdma network is finished CDMA called subscriber's call proceeding, returns CDMA exhalation request response to IMS gateway 2; , IMS gateway 2 is the CDMA adaptive IMS of the being converted to exhalation of the request response request response of breathing out, and is transmitted to CN, finishes the follow-up processing that continues by CN.

In realizing process of the present invention, the inventor finds that there are the following problems at least in the prior art: the client communicates business between legacy network, even the communication between the calling and called user only relates to non-IMS Network, and do not relate to the Business Processing and the resource of IMS network internal, communication process between the calling and called user is still similar with the above-mentioned flow process that connects, need between IMS network and legacy network, carry out repeatedly the adaptive of agreement and conversion, with between former legacy network according to the interconnection protocol of standard directly mutually intercommunication compare, processing procedure is loaded down with trivial details, it is long to call out time-delay, cause the Quality of experience of client communication between legacy network to descend thus, client communication has also consumed a large amount of IMS network processes capacity between this legacy network simultaneously.

Summary of the invention

Embodiments of the invention provide communication means, the Apparatus and system between a kind of subnet, can be in IMS network and legacy network and the network of depositing, improve the client's who only uses non-IMS Network Quality of experience, and can effectively reduce IMS network processes link, reduce taking to IMS network processes capacity.

For achieving the above object, embodiments of the invention adopt following technical scheme:

Communication means between a kind of subnet comprises:

The IMS network comprises first gateway and second gateway and core net; Described first gateway connects the described core net and first subnet respectively; Described second gateway connects the described core net and second subnet respectively;

Described core net receives the business request information that is sent by described first gateway, and described business request information is used for the described first subnet request and described second subnet communicates;

Described core net is obtained the external interface types of described first subnet and described second subnet respectively according to described business request information;

Described core net is non-IMS Network in the communication service of determining described first subnet and described second subnet according to described business request information, and when the external interface types of determining described first subnet and described second subnet is identical, send the Indication message that direct transfers to described first gateway or described second gateway respectively, be used for described first gateway or described second gateway and obtain the tunnel that direct transfers that carries out described communication service each other according to the described Indication message that direct transfers.

Communicator between a kind of subnet comprises:

The request message receiving element is used to receive the business request information that is sent by first gateway, and described business request information is used for the described first subnet request and described second subnet communicates;

The interface type acquiring unit is used for the business request information according to the reception of described request message sink unit, obtains the external interface types of described first subnet and described second subnet respectively;

The indication transmitting element direct transfers, be used for determining that in the business request information that receives according to described request message sink unit the communication service of described first subnet and described second subnet is non-IMS Network, and when described first subnet that definite described interface type acquiring unit obtains is identical with the external interface types of described second subnet, send the Indication message that direct transfers to described first gateway or second gateway that connects described second subnet respectively, be used for described first gateway or described second gateway and obtain the tunnel that direct transfers that carries out described communication service each other according to the described Indication message that direct transfers.

Communication means between a kind of subnet comprises:

First gateway is notified to core net with the external interface types of first subnet; Described first subnet is connected with described first gateway;

Described first gateway receives the Indication message that direct transfers that is sent by described core net;

Described first gateway obtain according to the described Indication message that direct transfers and second gateway between the tunnel that direct transfers;

Described first gateway carries out communicating by letter of non-IMS Network by the described tunnel that direct transfers with described second gateway.

A kind of gateway comprises:

The interface type notification unit, the external interface types that is used for first subnet that will connect is notified to core net;

The indication receiving element that direct transfers is used to receive the Indication message that direct transfers that is sent by described core net;

The tunnel acquiring unit that direct transfers is used for the Indication message that direct transfers that receives according to the described indication receiving element that direct transfers, obtain and second gateway between the tunnel that direct transfers;

The tunnel communication unit is used for carrying out communicating by letter of non-IMS Network by the tunnel that direct transfers that the described tunnel acquiring unit that direct transfers obtains with described second gateway.

Communication system between a kind of subnet comprises first gateway and core net communicator and second gateway that is connected second subnet that connect first subnet;

Wherein, described first gateway is used to receive the business request information by user's transmission of first subnet; Transmit described business request information to described core net communicator and also the external interface types of described first subnet is notified to described core net communicator; The Indication message that direct transfers that reception is sent by described core net communicator; According to the described Indication message that direct transfers obtain and described second gateway between the tunnel that direct transfers; Carry out communicating by letter of non-IMS Network by the described tunnel that direct transfers with described second gateway;

Described core net communicator is used to receive the business request information by described first gateway forwards; Obtain the external interface types of described first subnet and described second subnet respectively according to described business request information; Professional in the user's communications of user who determines described first subnet according to described business request information and described second subnet is non-IMS Network, and when the external interface types of determining described first subnet and described second subnet is identical, send the Indication message that direct transfers to described first gateway or described second gateway respectively;

Described second gateway is used to receive the interface inquiry request message that is sent by described core net communicator; According to described interface inquiry request message the external interface types of described second subnet is notified to described core net communicator; The Indication message that direct transfers that reception is sent by described core net communicator or described first gateway; According to the described Indication message that direct transfers obtain and described first gateway between the tunnel that direct transfers; Carry out communicating by letter of non-IMS Network by the described tunnel that direct transfers with described first gateway.

Communication means between the subnet that the embodiment of the invention provides, Apparatus and system, when carrying out service communication by user at the user of first subnet and second subnet, obtain the external interface types of described first subnet and described second subnet respectively, and, the user who determines described first subnet and the user's communications business of described second subnet is non-IMS Network, and when the external interface types of determining described first subnet and described second subnet is identical, send the Indication message that direct transfers to first gateway or second gateway respectively, and described first gateway or described second gateway obtain the mutual tunnel and carry out the communication of non-IMS Network by this tunnel that direct transfers of direct transferring according to the described Indication message that direct transfers.Therefore, when the communication between the two subnet users does not relate to the Business Processing of IMS network internal and resource, reduced the communication between the two subnet users owing to stride the suffered influence of IMS network, make the processing procedure of communicating by letter between the two subnet users obtain simplifying, calling out time-delay shortens, guarantee the Quality of experience of client communication between legacy network, saved IMS network processes capacity simultaneously.

Description of drawings

In order to be illustrated more clearly in the technical scheme of the embodiment of the invention, the accompanying drawing of required use is done an introduction simply in will describing embodiment below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.

The schematic flow sheet of the communication means between a kind of subnet that Fig. 1 provides for the embodiment of the invention;

The schematic flow sheet of the communication means between the another kind of subnet that Fig. 2 provides for the embodiment of the invention;

The schematic flow sheet of the communication means between another subnet that Fig. 3 provides for the embodiment of the invention;

The schematic flow sheet of the communication means between the another kind of subnet that Fig. 4 provides for the embodiment of the invention;

The schematic flow sheet of the communication means between another subnet that Fig. 5 provides for the embodiment of the invention;

The schematic flow sheet of the communication means between another subnet that Fig. 6 provides for the embodiment of the invention;

The formation schematic diagram of the communicator between a kind of subnet that Fig. 7 provides for the embodiment of the invention;

The formation schematic diagram of a kind of gateway that Fig. 8 provides for the embodiment of the invention;

The formation schematic diagram of the communication system between a kind of subnet that Fig. 9 provides for the embodiment of the invention.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.

For in IMS network and legacy network and the network deposited, improve the client's who only uses non-IMS Network Quality of experience, the embodiment of the invention provides the communication means between a kind of subnet, in the method, the IMS network comprises first gateway and second gateway and core net, first gateway connects the core net and first subnet respectively, and second gateway connects the core net and second subnet respectively.As shown in Figure 1, comprising:

101, core net receives the business request information that is sent by first gateway, and described business request information is used for the described first subnet request and described second subnet communicates;

In embodiments of the present invention, described first subnet and described second subnet are represented the network at calling subscriber and called subscriber place respectively.Described first gateway and described second gateway include MGCF (Media GatewayControl Function, MGCF), MGW (Media GateWay, media gateway) and SGW equipment such as (Signalling Gateway, SGWs).Core net comprises P-CSCF (ProxyCall Session Control Function, Proxy Call Session Control Function), I-CSCF (Interrogating Call Session Control Function, the query call conversation control function), S-CSCF (Serving Call Session Control Function, service call conversation control function), BGCF (Breakout Gateway Control Function, Breakout Gateway Control Function), HSS network elements such as (Home Subscriber Server, home subscriber servers).Described non-IMS Network, being does not need to take any business processing resources of IMS core net, only needs the business that the speech channel connection can be finished between two subnets, such as: traditional voice service.

Described business request information is issued first gateway by first subnet, and first gateway can be preserved the copy of a described business request information when receiving the business request information of described first subnet.

First gateway can carry into message to the external interface types between first gateway with first subnet when core net is transmitted described business request information.

102, core net is obtained the external interface types of described first subnet and described second subnet respectively according to described business request information;

In embodiments of the present invention, the external interface types of described first subnet is that first subnet is to the external interface types between first gateway.The external interface types of described second subnet is that second subnet is to the external interface types between second gateway.

Core net can determine that described business request information is the business request information that the user of the user of described first subnet and second subnet communicates after receiving described business request information.And, the external interface types that can in described business request information, carry described first subnet, core net can be obtained the external interface types of described first subnet that carries from described business request information so.Perhaps, core net also can be to the described first gateway transmission interface inquiry request message, and after receiving the interface query response message that is sent by described first gateway, obtains the external interface types of described first subnet from described interface query response message;

And core net is carried out route according to the called subscriber, determines that called needs pass through second gateway to second subnet, can be in the external interface types of obtaining described second subnet when second gateway carries out called flow simultaneously; Perhaps core net is to the second gateway transmission interface inquiry request message, and after receiving the interface query response message that is sent by described second gateway, obtains the external interface types of described second subnet from described interface query response message.

103, core net is non-IMS Network in the communication service of determining described first subnet and described second subnet according to described business request information, and when the external interface types of determining described first subnet and described second subnet is identical, send the Indication message that direct transfers to described first gateway or described second gateway respectively, described first gateway or described second gateway are set up the tunnel that direct transfers according to the described Indication message that direct transfers.

Wherein, the described Indication message that direct transfers can carry the opposite end gateway address, first gateway and second gateway is set up according to described opposite end gateway address direct transferred the tunnel or obtain the good tunnel that direct transfers of foundation in advance.Perhaps, the described Indication message that direct transfers also can carry the Tunnel Identifier that direct transfers, make first gateway and second gateway from the tunnel of setting up in advance, determine the direct transfer tunnel corresponding, and this tunnel that direct transfers is the tunnel that direct transfers that foundation is in advance got well between first gateway and second gateway with the described Tunnel Identifier that direct transfers.

Follow-up, described first gateway sends to second gateway by the copy of the described business request information that the described tunnel that direct transfers will be preserved, and second gateway is transmitted to second subnet again, makes first subnet and second subnet carry out direct communication by the described tunnel that direct transfers.

Communication means between the subnet that present embodiment provides, when carrying out service communication by user at the user of first subnet and second subnet, obtain the external interface types of described first subnet and described second subnet respectively, and, when the external interface types of determining described first subnet and described second subnet is identical, send the Indication message that direct transfers to first gateway or second gateway respectively, make described first gateway or described second gateway set up the tunnel that direct transfers, make first subnet and second subnet carry out direct communication by this tunnel that direct transfers according to the described Indication message that direct transfers.Therefore, when the communication between the two subnet users does not relate to the Business Processing of IMS network internal and resource, reduced the communication between the two subnet users owing to stride the suffered influence of IMS network, make the processing procedure of communicating by letter between the two subnet users obtain simplifying, calling out time-delay shortens, guarantee the Quality of experience of client communication between legacy network, saved IMS network processes capacity simultaneously.

For a last embodiment is described in further detail, the embodiment of the invention also provides the communication means between a kind of subnet, as shown in Figure 2, comprising:

201, core net receives the business request information that is sent by described first gateway, and described business request information is used for the described first subnet request and described second subnet communicates;

For example, when the user of first subnet need be with the telex network of second subnet, first subnet sent business request information to first gateway, and this business request information is used for the first subnet request and second subnet communicates.First gateway is preserved the copy of a described business request information when receiving the business request information of described first subnet.First gateway is transmitted this business request information to core net, and adds the external interface information of first subnet in the business request information of transmitting.

202, core net is determined described first subnet and described second subnet that communicate according to described business request information;

For example, core net reads first subnet that communicates of request from the regulation field of this business request information after receiving business request information, and is requested second subnet that communicates with first subnet.

203, core net is obtained the external interface types of described first subnet from described business request information;

In addition, when adding the external interface types of first subnet in the business request information that first gateway is not being transmitted, core net can also be to the described first gateway transmission interface inquiry request message, and after receiving the interface query response message that sends by described first gateway, from described interface query response message, obtain the external interface types of described first subnet.

204, core net is to the described second gateway transmission interface inquiry request message, and after receiving the interface query response message that is sent by described second gateway, obtains the external interface types of described second subnet from described interface query response message.

For example, core net is determined second gateway be connected with second subnet after having determined second subnet that is requested to communicate with first subnet, and to this second gateway transmission interface inquiry request message.After second gateway received this interface inquiry request message, to core net transmission interface query response message, this interface query response message comprised the external interface types of second subnet.Core net reads the external interface types of second subnet from the specific fields of this interface query response message behind the interface query response message that receives this second gateway transmission.

205, core net is non-IMS Network in the communication service of determining described first subnet and described second subnet according to described business request information, and when the external interface types of determining described first subnet and described second subnet is identical, send the Indication message that direct transfers to described first gateway or described second gateway respectively, be used for described first gateway or described second gateway and obtain the tunnel that direct transfers that carries out described communication service each other according to the described Indication message that direct transfers.

Wherein, core net is non-IMS Network in the communication service of determining described first subnet and described second subnet according to described business request information, and when the external interface types of determining described first subnet and described second subnet is identical, can send the Indication message that direct transfers of the address that comprises described second gateway to described first gateway, and send the Indication message that direct transfers of the address that comprises described first gateway to described second gateway.After first gateway and second gateway receive the corresponding Indication message that direct transfers respectively, first gateway and second gateway are set up the tunnel that direct transfers according to the address in the described Indication message that direct transfers, perhaps from set up the good tunnel that direct transfers in advance, choose the tunnel that direct transfers, be used for the user of first subnet and the user's communications of second subnet.

Perhaps, core net is non-IMS Network in the communication service of determining described first subnet and described second subnet according to described business request information, and when the external interface types of determining described first subnet and described second subnet is identical, also can send the Indication message that direct transfers that comprises the Tunnel Identifier that direct transfers to described first gateway and described second gateway respectively.After first gateway and second gateway receive the corresponding Indication message that direct transfers respectively, described first gateway and described second gateway are chosen the tunnel that direct transfers according to the described Tunnel Identifier that direct transfers from set up the good tunnel that direct transfers in advance, be used for the user of first subnet and the user's communications of second subnet.

Perhaps, core net is non-IMS Network in the communication service of determining described first subnet and described second subnet according to described business request information, and when the external interface types of determining described first subnet and described second subnet is identical, also can send the Indication message that direct transfers of the address that comprises described second gateway to described first gateway.After first gateway received this Indication message that direct transfers, described first gateway sent the Indication message that direct transfers of the address that comprises described first gateway to described second gateway according to the Indication message that direct transfers that receives.Then, described first gateway and described second gateway are set up the tunnel that direct transfers according to the address in the Indication message that direct transfers that receives separately, perhaps from set up the good tunnel that direct transfers in advance, choose the tunnel that direct transfers, be used for the user of first subnet and the user's communications of second subnet.

Perhaps, core net is non-IMS Network in the communication service of determining described first subnet and described second subnet according to described business request information, and when the external interface types of determining described first subnet and described second subnet is identical, can also send the Indication message that direct transfers that comprises the described Tunnel Identifier that direct transfers to described first gateway.After first gateway receives the Indication message that direct transfers of core net transmission, to the described Indication message that direct transfers of described second gateway forwards.Then, described first gateway and described second gateway are chosen the tunnel that direct transfers according to the Tunnel Identifier that direct transfers in the Indication message that direct transfers that receives separately from set up the good tunnel that direct transfers in advance, be used for the user of first subnet and the user's communications of second subnet.

With said method accordingly, the embodiment of the invention also provides the communication means between a kind of subnet, as shown in Figure 3, comprising:

301, first gateway is notified to core net with the external interface types of first subnet; Described first subnet is connected with described first gateway;

Wherein, first gateway can obtain the external interface types of described first subnet when the business request information that the user who receives by first subnet sends, and transmits the business request information that comprises the external interface types of obtaining to core net.

Perhaps, first gateway also can be when receiving the interface inquiry request message that is sent by core net, determine first subnet and obtain the external interface types of described first subnet according to described interface inquiry request message, then, to described core net transmission interface query response message, described interface query response message comprises the external interface types of obtaining.

In embodiments of the present invention, can be when subnet or gateway configuration the external interface types of a plurality of subnets be pre-stored in the gateway, gateway can obtain the external interface types of described subnet from the external interface types of a plurality of subnets of prestoring; Perhaps, gateway also can obtain the external interface types of described subnet by discerning automatically or the study interface type.

302, first gateway receives the Indication message that direct transfers that is sent by described core net;

303, first gateway obtain according to the described Indication message that direct transfers and second gateway between the tunnel that direct transfers;

When first gateway carries second gateway address at the described Indication message that direct transfers, determine second gateway, the tunnel that direct transfers between foundation and described second gateway according to second gateway address in the described Indication message that direct transfers.

Perhaps, first gateway carries when direct transferring Tunnel Identifier at the described Indication message that direct transfers, from the tunnel of setting up in advance, determine the direct transfer tunnel corresponding, and this tunnel that direct transfers is the tunnel that direct transfers that foundation is in advance got well between first gateway and second gateway with the described Tunnel Identifier that direct transfers.

304, first gateway carries out communicating by letter of non-IMS Network by the described tunnel that direct transfers with described second gateway.

Communication means between the subnet that present embodiment provides, when carrying out service communication by user at the user of first subnet and second subnet, the external interface of subnet is notified to core net, judge that in this core net the user of described first subnet and the user's communications business of described second subnet are non-IMS Network, and when the external interface types of described first subnet and described second subnet is identical, the Indication message that direct transfers that reception is sent by this core net, and obtain the mutual tunnel and carry out the communication of non-IMS Network by this tunnel that direct transfers of direct transferring according to the described Indication message that direct transfers.Therefore, when the communication between the two subnet users does not relate to the Business Processing of IMS network internal and resource, reduced the communication between the two subnet users owing to stride the suffered influence of IMS network, make the processing procedure of communicating by letter between the two subnet users obtain simplifying, calling out time-delay shortens, guarantee the Quality of experience of client communication between legacy network, saved IMS network processes capacity simultaneously.

In a last embodiment, the gateway that described first gateway both can be connected for first subnet with request communication also can be the gateway that is connected with second subnet that is requested to communicate by letter.Below in conjunction with above-mentioned two kinds of different situations a last embodiment is described in further detail.

Situation one

The embodiment of the invention provides the communication means between a kind of subnet, as shown in Figure 4, comprising:

401, first gateway receives the business request information by user's transmission of first subnet;

For example, when the user of first subnet need communicate with the user of second subnet, first subnet sent business request information to first gateway.

402, first gateway obtains the external interface types of described first subnet;

For example, first gateway is determined first subnet of request communication then, to obtain the external interface types of described first subnet according to this business request information when the business request information that the user who receives by first subnet sends.For example, first gateway can obtain the external interface types of described first subnet from the external interface types of a plurality of subnets of being pre-stored in first gateway, perhaps, first gateway also can obtain the external interface types of first subnet by discerning automatically or the study interface type.

403, first gateway is transmitted the business request information that comprises the external interface types of obtaining to core net; For example, after first gateway has obtained the external interface types of first subnet, when the business request information of transmitting to core net, the external interface types of in this business request information, adding first subnet.

404, first gateway receives the Indication message that direct transfers that is sent by described core net;

For example, when core net determines that according to described business request information the communication service of described first subnet and described second subnet is non-IMS Network, and when the external interface types of determining described first subnet and described second subnet was identical, core net can send the Indication message that direct transfers to first gateway or second gateway respectively.First gateway receives this Indication message that direct transfers.

405, first gateway obtain according to the described Indication message that direct transfers and second gateway between the tunnel that direct transfers;

For example, when in the Indication message that direct transfers that first gateway receives, comprising the address of second gateway, first gateway is determined described second gateway according to the address of described second gateway in the described Indication message that direct transfers, and the tunnel that direct transfers between foundation and described second gateway, or from the tunnel of setting up in advance that direct transfers, obtain and second gateway between the tunnel that direct transfers.

Perhaps, comprise in the Indication message that direct transfers that first gateway receives when direct transferring Tunnel Identifier, first gateway is according to the Tunnel Identifier that direct transfers in the described Indication message that direct transfers, from the tunnel of setting up in advance that direct transfers, obtain and second gateway between the tunnel that direct transfers.

In addition, when core net only sends when direct transferring Indication message to first gateway, when in the Indication message that direct transfers that first gateway receives, comprising the address of second gateway, first gateway also sends the Indication message that direct transfers of the address that comprises first gateway to second gateway, perhaps, comprise when direct transferring Tunnel Identifier in the Indication message that direct transfers that first gateway receives, first gateway is to this Indication message that direct transfers of second gateway forwards.

406, first gateway carries out communicating by letter of non-IMS Network by the described tunnel that direct transfers with described second gateway.

Situation two

The embodiment of the invention provides the communication means between a kind of subnet, as shown in Figure 5, comprising:

501, first gateway receives the interface inquiry request message that is sent by core net;

For example, when core net is known the external interface types of first subnet at needs, to the first gateway transmission interface inquiry request message.

502, first gateway is determined first subnet according to described interface inquiry request message;

For example, first gateway determines that according to described interface inquiry request message the core net needs know the external interface types of first subnet.

503, first gateway obtains the external interface types of described first subnet;

For example, first gateway obtains the external interface types of described first subnet behind first subnet of determining request communication.For example, first gateway can obtain the external interface types of described first subnet from the external interface types of a plurality of subnets of being pre-stored in first gateway, perhaps, first gateway also can obtain the external interface types of first subnet by discerning automatically or the study interface type.

504, first gateway is to described core net transmission interface query response message, and described interface query response message comprises the external interface types of obtaining.

505, first gateway receives the Indication message that direct transfers that is sent by described core net;

506, first gateway obtain according to the described Indication message that direct transfers and second gateway between the tunnel that direct transfers;

507, first gateway carries out communicating by letter of non-IMS Network by the described tunnel that direct transfers with described second gateway.

Communication means between the subnet that present embodiment provides, when carrying out service communication by user at the user of first subnet and second subnet, the external interface of first subnet is notified to core net, judge that in this core net the user of described first subnet and the user's communications business of described second subnet are non-IMS Network, and when the external interface types of described first subnet and described second subnet is identical, the Indication message that direct transfers that reception is sent by this core net, and obtain the mutual tunnel and carry out the communication of non-IMS Network by this tunnel that direct transfers of direct transferring according to the described Indication message that direct transfers.Therefore, when the communication between the two subnet users does not relate to the Business Processing of IMS network internal and resource, reduced the communication between the two subnet users owing to stride the suffered influence of IMS network, make the processing procedure of communicating by letter between the two subnet users obtain simplifying, calling out time-delay shortens, guarantee the Quality of experience of client communication between legacy network, saved IMS network processes capacity simultaneously.

Be example with PSTN customer call CDMA user below, above-described method is described in further detail.

As shown in Figure 6, the communication means between a kind of subnet that the embodiment of the invention provides comprises:

601, first gateway is received the calling subscriber's of PSTN network PSTN call request message, and this message is carried out buffer memory, enters step 602.

602, first gateway is resolved this PSTN call request message, and with the adaptive IMS call setup message that is converted to of this PSTN call request message, newly-increased interface type in this IMS call setup message, promptly this IMS call setup message carries the interface type of caller exhalation interface.First gateway sends to core net with this IMS call setup message and handles, and core net can be carried out the control of calling subscriber's call session according to this IMS call setup message, enters step 603.

In the present embodiment, the interface type of configuring external interface in first gateway in advance.For example,

The external interface sign	Interface type
The external interface sign	Interface type	Interface 1	??ISUP

If it is pre-configured that the IMS gateway does not have, then need the IMS gateway to obtain actual interface type by the method for automatic identification and study interface type.

603, core net is carried out route according to the called subscriber in this IMS call setup message, sends exhalation interface inquiry request message to second gateway, enters step 604.

604, after second gateway is received this exhalation interface inquiry request message, determine called exhalation interface, and obtain and this called exhalation interface corresponding interface type.Second gateway sends exhalation interface query response message to core net, carries the interface type of this called exhalation interface in this exhalation interface query response message, enters step 605.

In the present embodiment, the interface type of configuring external interface in second gateway in advance.For example,

The external interface sign	Interface type
The external interface sign	Interface type	Interface 2	??ISUP

605, core net judges whether to satisfy following two conditions according to above-mentioned call progress information needs: 1) interface type of caller exhalation interface is consistent with the interface type of called exhalation interface; 2) this call business is non-IMS Network, does not promptly need to use the interior business resource of IMS network.If two conditions all satisfy, then enter step 606.If have one not satisfy in two conditions, then skip to step 609.

606, core net is called out the Indication message that direct transfers to first gateway and/or second gateway transmission IMS, enters step 607.

Core net can be called out the Indication message that direct transfers to first gateway and second gateway transmission IMS simultaneously, also can only send IMS to one of them gateway and call out the Indication message that direct transfers.

Can call out in the Indication message that direct transfers at this IMS and carry the Tunnel Identifier that direct transfers.

Also can call out the address of carrying the opposite end gateway in the Indication message that direct transfers at this IMS, core net is called out the address of carrying second gateway in the Indication message that direct transfers to the IMS that first gateway sends so, calls out the address of carrying first gateway in the Indication message that direct transfers to the IMS that second gateway sends.

607, after first gateway and/or second gateway receive that this IMS calls out the Indication message that direct transfers, call out the tunnel that direct transfers that the Indication message that direct transfers is established to the opposite end gateway, enter step 608 according to IMS.

If in described IMS calling direct transfers Indication message, carry the Tunnel Identifier that direct transfers, then directly select to set up in advance the tunnel that direct transfers well according to the Tunnel Identifier that direct transfers.Wherein, the tunnel that direct transfers between first gateway and second gateway can be divided into signaling plane and the service surface tunnel that direct transfers, and independent foundation can be distinguished in the two classes tunnel that direct transfers.Preferably, the signaling plane that set up to transmit pstn signaling on the IP network tunnel that direct transfers can adopt the SIGTRAN stack, sets up the service surface that transmits the real-time voice business tunnel that direct transfers and can adopt the RTP/RTCP protocol stack on IP network.The foundation in tunnel of direct transferring can be fixed foundation between each IMS gateway, by sharing between all equidirectional callings.Perhaps, also can dynamically set up the tunnel that direct transfers by calling out, this tunnel that direct transfers is monopolized by this calling or is shared by all equidirectional callings.

If in described IMS calling direct transfers Indication message, do not carry the Tunnel Identifier that direct transfers, only carried the address information of opposite end gateway, and each gateway all pre-configured to the tunnel that direct transfers of each gateway, then can in the tunnel that direct transfers that is established in advance between each gateway, select, select to direct transfer accordingly the tunnel according to the address information of opposite end gateway.

If in described IMS calling direct transfers Indication message, do not carry the Tunnel Identifier that direct transfers, only carried the address information of opposite end gateway, and each gateway does not all have the pre-configured tunnel that direct transfers to each gateway, then can set up flow process, set up the tunnel that direct transfers with the opposite end gateway by carrying out the tunnel with the opposite end gateway.

608, first gateway will send to second gateway by the tunnel of setting up that direct transfers by the calling subscriber's of buffer memory PSTN call request message in step 601, jump to step 610.

609, core net is carried out route according to the called subscriber, sends the IMS call request message to second gateway, enters step 610.

610, after second gateway is received IMS call request message or PSTN call request message, this call request message is transmitted to cdma network, enters step 611.

If the message received of second gateway is the IMS call request message that comes from core net, then with this IMS call request message is adaptive be converted to the CDMA call request message after, issue cdma network again.

If the message that second gateway is received is the PSTN call request message from the tunnel that direct transfers, then this PSTN call request message directly can be issued cdma network.

Second gateway can write down special identifier, to distinguish this two kinds of different situations.

611, after cdma network is received this call request message, finish CDMA called subscriber's call proceeding, send CDMA call message, enter step 612 to second gateway according to this call request message.

612, after second gateway is received this CDMA call message, give the core net or first gateway with this CDMA call transfer of messages.

If the special identifier according to record indicates to send to core net, then need earlier the adaptive IMS of the being converted to call of CDMA call message message, give core net with this IMS call forwards again, core net is finished the follow-up processing that continues according to this IMS call message.

If the special identifier according to record indicates to send to the opposite end gateway by the tunnel that direct transfers, then this CDMA call message directly can be issued first gateway, and give the PSTN network by first gateway forwards,

Network based this CDMA call message of PSTN is finished the follow-up processing that continues, and PSTN network calling subscriber begins to listen to ring-back tone.

Called off-hook, cdma network sends the called off-hook signaling of CDMA to gateway, if the special identifier according to record indicates to send to the opposite end gateway by the tunnel that direct transfers, then the called off-hook signaling of this CDMA directly can be issued the PSTN network, the called off-hook signaling of network based this CDMA of PSTN is finished the follow-up processing that continues, and begins conversation between PSTN network calling subscriber and the cdma network called subscriber.

End of conversation between PSTN network calling subscriber and the cdma network called subscriber is dynamically to set up as if the tunnel that direct transfers between two gateways, then need consideration discharge this tunnel that direct transfers when calling out release.If the described tunnel that direct transfers is monopolized by described calling, then can directly discharge; If the described tunnel that direct transfers then can not discharge also being called out use by other.

Communication means between the subnet that present embodiment provides, when carrying out service communication by user at the user of PSTN network and cdma network, obtain the external interface types of PSTN network and cdma network respectively, and, the user who determines described PSTN network and the user's communications business of described cdma network is non-IMS Network, and when the external interface types of determining described PSTN network and described cdma network is identical, send the Indication message that direct transfers to first gateway or second gateway respectively, and described first gateway or described second gateway obtain the mutual tunnel and carry out the communication of non-IMS Network by this tunnel that direct transfers of direct transferring according to the described Indication message that direct transfers.Therefore, when the communication between the two subnet users does not relate to the Business Processing of IMS network internal and resource, reduced the communication between the two subnet users owing to stride the suffered influence of IMS network, make the processing procedure of communicating by letter between the two subnet users obtain simplifying, calling out time-delay shortens, guarantee the Quality of experience of client communication between legacy network, saved IMS network processes capacity simultaneously.Simultaneously and since the IMS network can perception this class call out, so the IMS network can charge to this type of calling equally, operations such as monitoring reach the purpose of unified management.

With said method accordingly, the embodiment of the invention also provides the communicator between a kind of subnet, as shown in Figure 7, comprising:

Request message receiving element 701 is used to receive the business request information that is sent by first gateway, and described business request information is used for the described first subnet request and described second subnet communicates;

Interface type acquiring unit 702 is used for the business request information according to 701 receptions of described request message sink unit, obtains the external interface types of described first subnet and described second subnet respectively;

Indication transmitting element 703 direct transfers, be used for determining that in the business request information that receives according to described request message sink unit 701 communication service of described first subnet and described second subnet is non-IMS Network, and when described first subnet that definite described interface type acquiring unit 702 obtains is identical with the external interface types of described second subnet, send the Indication message that direct transfers to described first gateway or second gateway that connects described second subnet respectively, be used for described first gateway or described second gateway and obtain the tunnel that direct transfers that carries out described communication service each other according to the described Indication message that direct transfers.

Further, described interface type acquiring unit 702 specifically comprises:

Subelement is determined in communication, is used for determining described first subnet and second subnet that communicate according to described business request information;

First interface obtains subelement, is used for obtaining from described business request information the external interface types of described first subnet; Perhaps, to the described first gateway transmission interface inquiry request message, and after receiving the interface query response message that sends by described first gateway, from described interface query response message, obtain the external interface types of described first subnet;

Second interface obtains subelement, be used for to the described second gateway transmission interface inquiry request message, and after receiving the interface query response message that sends by described second gateway, from described interface query response message, obtain the external interface types of described second subnet.

Further, the described indication transmitting element 703 that direct transfers specifically comprises:

Professional judgment sub-unit is used for judging according to the business request information that described request message sink unit receives whether the communication service of described first subnet and described second subnet is non-IMS Network;

The type judgment sub-unit is used to judge whether the external interface types of described first subnet that described interface type acquiring unit obtains and described second subnet is identical;

Message sends subelement, be used for judging that in described professional judgment sub-unit the communication service of described first subnet and described second subnet is non-IMS Network, and described type judgment sub-unit is judged when the external interface types of described first subnet and described second subnet is identical, send the Indication message that direct transfers of the address that comprises described second gateway to described first gateway, and send the Indication message that direct transfers of the address that comprises described first gateway to described second gateway, be used for described first gateway and described second gateway and set up according to the address of the described Indication message that direct transfers and direct transfer the tunnel or obtain the tunnel of setting up in advance that direct transfers.

Perhaps, the described indication transmitting element 703 that direct transfers specifically comprises:

Message sends subelement, be used for judging that in described professional judgment sub-unit the communication service of described first subnet and described second subnet is non-IMS Network, and described type judgment sub-unit is judged when the external interface types of described first subnet and described second subnet is identical, send the Indication message that direct transfers that comprises the Tunnel Identifier that direct transfers to described first gateway and described second gateway respectively, be used for described first gateway and described second gateway and obtain the tunnel of setting up in advance that direct transfers according to the Tunnel Identifier that direct transfers of the described Indication message that direct transfers.

Message sends subelement, be used for judging that in described professional judgment sub-unit the communication service of described first subnet and described second subnet is non-IMS Network, and described type judgment sub-unit is judged when the external interface types of described first subnet and described second subnet is identical, send the Indication message that direct transfers of the address that comprises described second gateway to described first gateway, be used for described first gateway and send the Indication message that direct transfers of the address that comprises described first gateway according to the Indication message that direct transfers that receives to described second gateway, described first gateway and described second gateway are set up according to the address in the described Indication message that direct transfers and are direct transferred the tunnel or obtain the tunnel of setting up in advance that direct transfers.

Message sends subelement, be used for judging that in described professional judgment sub-unit the communication service of described first subnet and described second subnet is non-IMS Network, and described type judgment sub-unit is judged when the external interface types of described first subnet and described second subnet is identical, send the Indication message that direct transfers that comprises the Tunnel Identifier that direct transfers to described first gateway, be used for described first gateway to the described Indication message that direct transfers of described second gateway forwards, described first gateway and described second gateway obtain the tunnel of setting up in advance that direct transfers according to the Tunnel Identifier that direct transfers in the described Indication message that direct transfers.

Communicator between the present embodiment subnet can be IMS server net, and its concrete How It Works can not repeat them here referring to the method shown in the accompanying drawing 1,2,6.

Communicator between the subnet that present embodiment provides, when carrying out service communication by user at the user of first subnet and second subnet, obtain the external interface types of described first subnet and described second subnet respectively, and, the user who determines described first subnet and the user's communications business of described second subnet is non-IMS Network, and when the external interface types of determining described first subnet and described second subnet is identical, send the Indication message that direct transfers to first gateway or second gateway respectively, make described first gateway or described second gateway obtain the mutual tunnel and carry out the communication of non-IMS Network by this tunnel that direct transfers of direct transferring according to the described Indication message that direct transfers.Therefore, when the communication between the two subnet users does not relate to the Business Processing of IMS network internal and resource, reduced the communication between the two subnet users owing to stride the suffered influence of IMS network, make the processing procedure of communicating by letter between the two subnet users obtain simplifying, calling out time-delay shortens, guarantee the Quality of experience of client communication between legacy network, saved IMS network processes capacity simultaneously.

With said apparatus accordingly, the embodiment of the invention also provides a kind of gateway, as shown in Figure 8, comprising:

Interface type notification unit 801, the external interface types that is used for first subnet that will connect is notified to core net;

Direct transfer and indicate receiving element 802, be used to receive the Indication message that direct transfers that sends by described core net;

The tunnel acquiring unit 803 that direct transfers, be used for according to the Indication message that direct transfers that the described indication receiving element 802 that direct transfers receives obtain and second gateway between the tunnel that direct transfers;

Tunnel communication unit 804 is used for carrying out communicating by letter of non-IMS Network by the tunnel that direct transfers that the described tunnel acquiring unit 803 that direct transfers obtains with described second gateway.

Further, institute's interface type notification unit 801 specifically comprises:

Request message receives subelement, is used to receive the business request information by user's transmission of first subnet;

Interface type obtains subelement, is used to obtain the external interface types of described first subnet;

Request message is transmitted subelement, is used for transmitting the business request information that comprises the external interface types of obtaining to core net.

Perhaps, institute's interface type notification unit 801 specifically comprises:

Query requests receives subelement, is used to receive the interface inquiry request message that is sent by core net;

Subnet is determined subelement, is used for determining first subnet according to described interface inquiry request message;

Inquiry response sends subelement, is used for to described core net transmission interface query response message, and described interface query response message carries the external interface types of obtaining.

Further, described interface type obtains subelement, specifically is used for obtaining the external interface types of described subnet from the external interface types of a plurality of subnets that prestore; Perhaps, by automatic identification or study interface type, obtain the external interface types of described subnet.

Further, the described tunnel acquiring unit 803 that direct transfers comprises:

Gateway is determined subelement, is used for determining described second gateway according to the address of described second gateway of the described Indication message that direct transfers;

Subelement is set up in the tunnel, is used to set up and described gateway is determined the tunnel that direct transfers between described second gateway that subelement determines, perhaps obtain set up in advance and described second gateway between the tunnel that direct transfers.

Perhaps, the described tunnel acquiring unit 803 that direct transfers comprises:

Sign is obtained subelement, is used for obtaining the Tunnel Identifier that direct transfers from the described Indication message that direct transfers;

The tunnel obtains subelement, is used for obtaining the Tunnel Identifier that direct transfers that subelement obtains according to described Tunnel Identifier, from the tunnel of setting up in advance that direct transfers, obtain and second gateway between the tunnel that direct transfers.

The concrete How It Works of present embodiment gateway can not repeat them here referring to the method shown in the accompanying drawing 3～6.

The gateway that present embodiment provides, when carrying out service communication by user at the user of first subnet and second subnet, the external interface of first subnet is notified to core net, judge that in this core net the user of described first subnet and the user's communications business of second subnet are non-IMS Network, and when the external interface types of described first subnet and described second subnet is identical, the Indication message that direct transfers that reception is sent by this core net, and obtain the mutual tunnel and carry out the communication of non-IMS Network by this tunnel that direct transfers of direct transferring according to the described Indication message that direct transfers.Therefore, when the communication between the two subnet users does not relate to the Business Processing of IMS network internal and resource, reduced the communication between the two subnet users owing to stride the suffered influence of IMS network, make the processing procedure of communicating by letter between the two subnet users obtain simplifying, calling out time-delay shortens, guarantee the Quality of experience of client communication between legacy network, saved IMS network processes capacity simultaneously.

With said method, the device accordingly, the embodiment of the invention also provides the communication system between a kind of subnet, as shown in Figure 9, comprises first gateway 901 and core net communicator 902 and second gateway 903 that is connected second subnet that connect first subnet;

Wherein, described first gateway 901 is used to receive the business request information by user's transmission of first subnet; Transmit described business request information to described core net communicator 902 and also the external interface types of described first subnet is notified to described core net communicator 902; The Indication message that direct transfers that reception is sent by described core net communicator 902; According to the described Indication message that direct transfers obtain and described second gateway 903 between the tunnel that direct transfers; Carry out communicating by letter of non-IMS Network by the described tunnel that direct transfers with described second gateway 903;

Described core net communicator 902 is used to receive the business request information of being transmitted by described first gateway 901; Obtain the external interface types of described first subnet and described second subnet respectively according to described business request information; Professional in the user's communications of user who determines described first subnet according to described business request information and described second subnet is non-IMS Network, and when the external interface types of determining described first subnet and described second subnet is identical, send the Indication message that direct transfers to described first gateway 901 or described second gateway 903 respectively;

Described second gateway 903 is used to receive the interface inquiry request message that is sent by described core net communicator 902; According to described interface inquiry request message the external interface types of described second subnet is notified to described core net communicator 902; The Indication message that direct transfers that reception is sent by described core net communicator 902 or described first gateway 901; According to the described Indication message that direct transfers obtain and described first gateway 901 between the tunnel that direct transfers; Carry out communicating by letter of non-IMS Network by the described tunnel that direct transfers with described first gateway 901.

Communication system between the subnet that present embodiment provides, when carrying out service communication by user at the user of first subnet and second subnet, obtain the external interface types of described first subnet and described second subnet respectively, and, the user who determines described first subnet and the user's communications business of described second subnet is non-IMS Network, and when the external interface types of determining described first subnet and described second subnet is identical, send the Indication message that direct transfers to first gateway or second gateway respectively, and described first gateway or described second gateway obtain the mutual tunnel and carry out the communication of non-IMS Network by this tunnel that direct transfers of direct transferring according to the described Indication message that direct transfers.Therefore, when the communication between the two subnet users does not relate to the Business Processing of IMS network internal and resource, reduced the communication between the two subnet users owing to stride the suffered influence of IMS network, make the processing procedure of communicating by letter between the two subnet users obtain simplifying, calling out time-delay shortens, guarantee the Quality of experience of client communication between legacy network, saved IMS network processes capacity simultaneously.

One of ordinary skill in the art will appreciate that all or part of flow process that realizes in the foregoing description method, be to instruct relevant hardware to finish by computer program, described program can be stored in the computer read/write memory medium, this program can comprise the flow process as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only storage memory body (Read-Only Memory, ROM) or at random store memory body (Random Access Memory, RAM) etc.

The above; only be the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.

Claims

1. the communication means between a subnet is characterized in that comprise: the IMS of network protocol multi-media system network comprises first gateway and second gateway and core net; Described first gateway connects the described core net and first subnet respectively; Described second gateway connects the described core net and second subnet respectively;

2. the communication means between subnet according to claim 1 is characterized in that, the external interface types that described core net is obtained described first subnet and described second subnet respectively according to described business request information comprises:

Described core net is determined described first subnet and described second subnet that communicate according to described business request information;

Described core net is obtained the external interface types of described first subnet from described business request information; Perhaps, to the described first gateway transmission interface inquiry request message, and after receiving the interface query response message that sends by described first gateway, from described interface query response message, obtain the external interface types of described first subnet;

Described core net is to the described second gateway transmission interface inquiry request message, and after receiving the interface query response message that is sent by described second gateway, obtains the external interface types of described second subnet from described interface query response message.

3. the communication means between subnet according to claim 1 is characterized in that, describedly sends the Indication message that direct transfers to described first gateway or described second gateway respectively and comprises:

Send the Indication message that direct transfers of the address that comprises described second gateway to described first gateway, and send the Indication message that direct transfers of the address that comprises described first gateway to described second gateway; Described first gateway and described second gateway are set up according to the address in the described Indication message that direct transfers and are direct transferred the tunnel or obtain the tunnel of setting up in advance that direct transfers.

4. the communication means between subnet according to claim 1 is characterized in that, describedly sends the Indication message that direct transfers to described first gateway or described second gateway respectively and comprises:

Send the Indication message that direct transfers that comprises the Tunnel Identifier that direct transfers to described first gateway and described second gateway respectively; Described first gateway and described second gateway obtain the tunnel of setting up in advance that direct transfers according to the described Tunnel Identifier that direct transfers.

5. the communication means between subnet according to claim 1 is characterized in that, describedly sends the Indication message that direct transfers to described first gateway or described second gateway respectively and comprises:

Send the Indication message that direct transfers of the address that comprises described second gateway to described first gateway; Described first gateway sends the Indication message that direct transfers of the address that comprises described first gateway to described second gateway according to the Indication message that direct transfers that receives; Described first gateway and described second gateway are set up according to the address in the described Indication message that direct transfers and are direct transferred the tunnel or obtain the tunnel of setting up in advance that direct transfers.

6. the communication means between subnet according to claim 1 is characterized in that, describedly sends the Indication message that direct transfers to described first gateway or described second gateway respectively and comprises:

Send the Indication message that direct transfers that comprises the described Tunnel Identifier that direct transfers to described first gateway; Described first gateway is to the described Indication message that direct transfers of described second gateway forwards; Described first gateway and described second gateway obtain the tunnel of setting up in advance that direct transfers according to the described Tunnel Identifier that direct transfers.

7. the communication means between subnet according to claim 1 is characterized in that, also comprises:

After described first gateway and described second gateway obtained the described tunnel that direct transfers, described first gateway sent described business request information by the described tunnel that direct transfers to described second gateway; Described second gateway is transmitted to described second subnet with described business request information.

8. the communication means between a subnet is characterized in that, comprising:

9. the communication means between subnet according to claim 8 is characterized in that, described first gateway is notified to core net with the external interface types of first subnet and comprises:

First gateway receives the business request information by user's transmission of first subnet;

Described first gateway obtains the external interface types of described first subnet;

Described first gateway is transmitted the business request information that comprises the external interface types of obtaining to core net.

10. the communication means between subnet according to claim 8 is characterized in that, described first gateway is notified to core net with the external interface types of first subnet and comprises:

First gateway receives the interface inquiry request message that is sent by core net;

Described first gateway is determined first subnet according to described interface inquiry request message;

Described first gateway is to described core net transmission interface query response message, and described interface query response message comprises the external interface types of obtaining.

11. the communication means between subnet according to claim 8 is characterized in that, described first gateway obtain according to the described Indication message that direct transfers and second gateway between the tunnel that direct transfers comprise:

Described first gateway is determined described second gateway according to the address of described second gateway in the described Indication message that direct transfers, and the tunnel or obtain in advance the tunnel of setting up that direct transfers of direct transferring between foundation and described second gateway; Perhaps,

Described first gateway is according to the Tunnel Identifier that direct transfers in the described Indication message that direct transfers, from the tunnel of setting up in advance that direct transfers, obtain and second gateway between the tunnel that direct transfers.

12. the communicator between a subnet is characterized in that, comprising:

13. the communicator between subnet according to claim 12 is characterized in that, described interface type acquiring unit comprises:

Subelement is determined in communication, is used for determining described first subnet and described second subnet that communicate according to described business request information;

14. the communicator between subnet according to claim 12 is characterized in that, the described indication transmitting element that direct transfers comprises:

15. the communicator between subnet according to claim 12 is characterized in that, the described indication transmitting element that direct transfers comprises:

16. the communicator between subnet according to claim 12 is characterized in that, the described indication transmitting element that direct transfers comprises:

17. the communicator between subnet according to claim 12 is characterized in that, the described indication transmitting element that direct transfers comprises:

18. a gateway is characterized in that, comprising:

19. gateway according to claim 18 is characterized in that, institute's interface type notification unit comprises:

20. gateway according to claim 18 is characterized in that, institute's interface type notification unit comprises:

Inquiry response sends subelement, is used for to described core net transmission interface query response message, and described interface query response message comprises the external interface types of obtaining.

21. gateway according to claim 18 is characterized in that, the described tunnel acquiring unit that direct transfers comprises:

22. gateway according to claim 18 is characterized in that, the described tunnel acquiring unit that direct transfers comprises:

23. the communication system between a subnet is characterized in that, comprises first gateway and core net communicator and second gateway that is connected second subnet that connect first subnet;