CN101808101B

CN101808101B - Communication method, device and system between sub networks

Info

Publication number: CN101808101B
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: 2013-01-09
Anticipated expiration: 2030-04-20
Also published as: CN101808101A

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 the development of telecommunication 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, the each side factors such as income and operations risks, 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.

The below is with PSTN (Public Switched Telephone Network, PSTN) user calls out CDMA (Code Division Multiple Access, code division multiple access) user is example, in the communication process between current sub network, the calling control that the IMS network carries out and the method that connects describe.The 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 processes; 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 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 thus the Quality of experience of client communication between legacy network to descend, 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 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 the first gateway and the second gateway and core net; Described the first gateway connects respectively described core net and the first subnet; Described the second gateway connects respectively described core net and the second subnet;

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

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

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

Communicator between a kind of subnet comprises:

The request message receiving element is used for receiving the business request information that is sent by the first gateway, and described business request information is used for described the first subnet request and described the 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 respectively the external interface types of described the first subnet and described the second subnet;

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 the first subnet and described the second subnet is non-IMS Network, and when described the first subnet that definite described interface type acquiring unit obtains is identical with the external interface types of described the second subnet, send the Indication message that direct transfers to described the first gateway or the second gateway of connecting described the second subnet respectively, be used for described the first gateway or described the second gateway and obtain the tunnel that direct transfers that carries out each other described communication service according to the described Indication message that direct transfers.

Communication means between a kind of subnet comprises:

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

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

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

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

A kind of gateway comprises:

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

The indication receiving element that direct transfers is used for receiving 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 the second gateway between the tunnel that direct transfers;

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

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

Wherein, described the first gateway is used for receiving the business request information by user's transmission of the first subnet; Transmitting described business request information to described core net communicator also notifies the external interface types of described the first subnet 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 the 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 the second gateway;

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

Described the second gateway is used for receiving 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 the 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 the first gateway; According to the described Indication message that direct transfers obtain and described the 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 the first gateway.

Communication means between the subnet that the embodiment of the invention provides, Apparatus and system, when carrying out service communication by the user at the user of the first subnet and the second subnet, obtain respectively the external interface types of described the first subnet and described the second subnet, and, communication service the user of the user who determines described the first subnet and described the second subnet is non-IMS Network, and when the external interface types of determining described the first subnet and described the second subnet is identical, send the Indication message that direct transfers to the first gateway or the second gateway respectively, and described the first gateway or described the 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 impact of IMS network, the processing procedure of communicating by letter between the two subnet users is simplified, calling out time-delay shortens, guarantee the Quality of experience of client communication between legacy network, saved simultaneously IMS network processes capacity.

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 was done a simply introduction during the below will describe embodiment, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.

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 obtains 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 the first gateway and the second gateway and core net, the first gateway connects respectively core net and the first subnet, and the second gateway connects respectively core net and the second subnet.As shown in Figure 1, comprising:

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

In embodiments of the present invention, described the first subnet and described the second subnet represent respectively the network at calling subscriber and called subscriber place.Described the first gateway and described the second gateway include MGCF (Media GatewayControl Function, MGCF), the equipment such as MGW (Media GateWay, media gateway) and SGW (Signalling Gateway, SGW).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), the network elements such as HSS (Home Subscriber Server, home subscriber server).Described non-IMS Network, being does not need to take any business processing resources of IMS core net, need the speech channel connection be achievable business between two subnets only, such as: traditional voice service.

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

The first gateway can carry the first subnet into message to the external interface types between the first gateway when transmitting described business request information to core net.

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

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

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

103, core net is non-IMS Network in the communication service of determining described the first subnet and described the second subnet according to described business request information, and when the external interface types of determining described the first subnet and described the second subnet is identical, send the Indication message that direct transfers to described the first gateway or described the second gateway respectively, described the first gateway or described the 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, the first gateway and the second gateway is set up according to described opposite end gateway address direct transferred the tunnel or obtain the tunnel that direct transfers that establishes in advance.Perhaps, the described Indication message that direct transfers also can carry the Tunnel Identifier that direct transfers, make the first gateway and the second gateway from the tunnel of setting up in advance, determine the direct transfer tunnel corresponding with the described Tunnel Identifier that direct transfers, and this tunnel that direct transfers is the tunnel that direct transfers that establishes in advance between the first gateway and the second gateway.

Follow-up, described the first gateway sends to the second gateway by the copy of the described business request information that the described tunnel that direct transfers will be preserved, and the second gateway is transmitted to the second subnet again, makes the first subnet and the 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 the user at the user of the first subnet and the second subnet, obtain respectively the external interface types of described the first subnet and described the second subnet, and, when the external interface types of determining described the first subnet and described the second subnet is identical, send the Indication message that direct transfers to the first gateway or the second gateway respectively, make described the first gateway or described the second gateway set up the tunnel that direct transfers according to the described Indication message that direct transfers, make the first subnet and the second subnet carry out direct communication by this tunnel 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 impact of IMS network, the processing procedure of communicating by letter between the two subnet users is simplified, calling out time-delay shortens, guarantee the Quality of experience of client communication between legacy network, saved simultaneously IMS network processes capacity.

For a upper 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 the first gateway, and described business request information is used for described the first subnet request and described the second subnet communicates;

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

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

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

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

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

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

For example, core net is determined the second gateway with the second Subnetwork connection after having determined the second subnet that requested and the first subnet communicate, and to this second gateway transmission interface inquiry request message.After the 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 the second subnet.Core net reads the external interface types of the 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 the first subnet and described the second subnet according to described business request information, and when the external interface types of determining described the first subnet and described the second subnet is identical, send the Indication message that direct transfers to described the first gateway or described the second gateway respectively, be used for described the first gateway or described the second gateway and obtain the tunnel that direct transfers that carries out each other described communication service according to the described Indication message that direct transfers.

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

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

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

Perhaps, core net is non-IMS Network in the communication service of determining described the first subnet and described the second subnet according to described business request information, and when the external interface types of determining described the first subnet and described the second subnet is identical, can also send the Indication message that direct transfers that comprises the described Tunnel Identifier that direct transfers to described the first gateway.After the first gateway receives the Indication message that direct transfers of core net transmission, to the described Indication message that direct transfers of described the second gateway forwards.Then, described the first gateway and described the 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 the tunnel that direct transfers that establishes in advance, and the user who is used for the first subnet communicates by letter with the user's of the 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, the first gateway notifies the external interface types of the first subnet to core net; Described the first subnet is connected with described the first gateway;

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

Perhaps, the first gateway also can be when receiving the interface inquiry request message that is sent by core net, determine the first subnet and obtain the external interface types of described the 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 by automatically identifying or the study interface type, obtain the external interface types of described subnet.

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

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

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

Perhaps, the 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 with the described Tunnel Identifier that direct transfers, and this tunnel that direct transfers is the tunnel that direct transfers that establishes in advance between the first gateway and the second gateway.

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

Communication means between the subnet that present embodiment provides, when carrying out service communication by the user at the user of the first subnet and the second subnet, the external interface of subnet is notified to core net, the communication service of judging the user of the user of described the first subnet and described the second subnet in this core net is non-IMS Network, and when the external interface types of described the first subnet and described the 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 impact of IMS network, the processing procedure of communicating by letter between the two subnet users is simplified, calling out time-delay shortens, guarantee the Quality of experience of client communication between legacy network, saved simultaneously IMS network processes capacity.

In a upper embodiment, described the first gateway both can for the gateway of request first Subnetwork connection of communicating by letter, also can for the gateway of requested the second Subnetwork connection of communicating by letter.Below in conjunction with above-mentioned two kinds of different situations a upper 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, the first gateway receives the business request information by user's transmission of the first subnet;

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

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

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

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

404, the 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 the first subnet and described the second subnet is non-IMS Network, and when the external interface types of determining described the first subnet and described the second subnet was identical, core net can send the Indication message that direct transfers to the first gateway or the second gateway respectively.The first gateway receives this Indication message that direct transfers.

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

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

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

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

406, the first gateway carries out communicating by letter of non-IMS Network by the described tunnel that direct transfers with described the 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, the 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 the first subnet at needs, to the first gateway transmission interface inquiry request message.

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

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

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

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

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

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

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

Communication means between the subnet that present embodiment provides, when carrying out service communication by the user at the user of the first subnet and the second subnet, the external interface of the first subnet is notified to core net, the communication service of judging the user of the user of described the first subnet and described the second subnet in this core net is non-IMS Network, and when the external interface types of described the first subnet and described the 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 impact of IMS network, the processing procedure of communicating by letter between the two subnet users is simplified, calling out time-delay shortens, guarantee the Quality of experience of client communication between legacy network, saved simultaneously IMS network processes capacity.

The below calls out CDMA user as example take PSTN user, and 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, the 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, the 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, namely this IMS call setup message carries the interface type of caller exhalation interface.The first gateway sends to core net with this IMS call setup message and processes, 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 the first gateway in advance.For example,

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 the second gateway, enters step 604.

604, after the second gateway is received this exhalation interface inquiry request message, determine called exhalation interface, and obtain and this called exhalation interface corresponding interface type.The 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 the second gateway in advance.For example,

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 namely 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 the first gateway and/or the second gateway transmission IMS, enters step 607.

Core net can be called out the Indication message that direct transfers to the first gateway and the 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 the second gateway in the Indication message that direct transfers to the IMS that the first gateway sends so, and the IMS that sends to the second gateway calls out the address of carrying the first gateway in the Indication message that direct transfers.

607, after the first gateway and/or the 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 according to IMS, enter step 608.

If in described IMS calling direct transfers Indication message, carry the Tunnel Identifier that direct transfers, the tunnel that direct transfers that then directly establishes in advance according to the Tunnel Identifier selection that direct transfers.Wherein, the tunnel that direct transfers between the first gateway and the 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 in 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 in IP network and can adopt the RTP/RTCP protocol stack.The foundation in tunnel of direct transferring can be fixed foundation between each IMS gateway, by sharing between all equidirectional callings.Perhaps, also can be by calling out the Dynamic Establishing tunnel that direct transfers, 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 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 according to the address information of opposite end gateway, select to direct transfer accordingly the tunnel.

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 have the pre-configured tunnel that direct transfers to each gateway, then can by carrying out the building tunnel flow process with the opposite end gateway, set up the tunnel that direct transfers with the opposite end gateway.

608, the first gateway will send to the second gateway by the tunnel that direct transfers that establishes 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 the second gateway, enters step 610.

610, after the 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 that the second gateway is received 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 again cdma network.

If the message that the 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.

The second gateway can record 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 according to this call request message, send CDMA call message to the second gateway, enter step 612.

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

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

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

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 if the tunnel that direct transfers between two gateways is Dynamic Establishing, then need to consider to discharge this tunnel that direct transfers calling out when discharging.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 the user at the user of PSTN network and cdma network, obtain respectively the external interface types of PSTN network and cdma network, and, communication service the user of the user who determines described PSTN network and 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 the first gateway or the second gateway respectively, and described the first gateway or described the 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 impact of IMS network, the processing procedure of communicating by letter between the two subnet users is simplified, calling out time-delay shortens, guarantee the Quality of experience of client communication between legacy network, saved simultaneously IMS network processes capacity.Simultaneously and since the IMS network can perception this class call out, so the IMS network can carry out charging to this type of calling equally, the 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 for receiving the business request information that is sent by the first gateway, and described business request information is used for described the first subnet request and described the 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 respectively the external interface types of described the first subnet and described the second subnet;

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 the first subnet and described the second subnet is non-IMS Network, and when described the first subnet that definite described interface type acquiring unit 702 obtains is identical with the external interface types of described the second subnet, send the Indication message that direct transfers to described the first gateway or the second gateway of connecting described the second subnet respectively, be used for described the first gateway or described the second gateway and obtain the tunnel that direct transfers that carries out each other described communication service according to the described Indication message that direct transfers.

Further, described interface type acquiring unit 702 specifically comprises:

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

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

The second interface obtains subelement, be used for to described the second gateway transmission interface inquiry request message, and after receiving the interface query response message that is sent by described the second gateway, from described interface query response message, obtain the external interface types of described the 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 the first subnet and described the second subnet is non-IMS Network;

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

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

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

Message sends subelement, be used for judging that in described professional judgment sub-unit the communication service of described the first subnet and described the second subnet is non-IMS Network, and described type judgment sub-unit is judged when the external interface types of described the first subnet and described the second subnet is identical, send the Indication message that direct transfers that comprises the Tunnel Identifier that direct transfers to described the first gateway, be used for described the first gateway to the described Indication message that direct transfers of described the second gateway forwards, described the first gateway and described the second gateway obtain the tunnel that direct transfers of setting up in advance 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 referring to the method shown in the accompanying drawing 1,2,6, not repeat them here.

Communicator between the subnet that present embodiment provides, when carrying out service communication by the user at the user of the first subnet and the second subnet, obtain respectively the external interface types of described the first subnet and described the second subnet, and, communication service the user of the user who determines described the first subnet and described the second subnet is non-IMS Network, and when the external interface types of determining described the first subnet and described the second subnet is identical, send the Indication message that direct transfers to the first gateway or the second gateway respectively, make described the first gateway or described the 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 impact of IMS network, the processing procedure of communicating by letter between the two subnet users is simplified, calling out time-delay shortens, guarantee the Quality of experience of client communication between legacy network, saved simultaneously IMS network processes capacity.

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 is notified to core net for the external interface types of first subnet that will connect;

Direct transfer and indicate receiving element 802, be used for receiving the Indication message that direct transfers that is sent 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 the second gateway between the tunnel that direct transfers;

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

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

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

Interface type obtains subelement, is used for obtaining the external interface types of described the 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 for receiving the interface inquiry request message that is sent by core net;

Subnet is determined subelement, is used for determining the 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, and concrete being used for obtained 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 the second gateway according to the address of described second gateway of the described Indication message that direct transfers;

The building tunnel subelement be used for to be set up with described gateway and is determined the tunnel that direct transfers between described the second gateway that subelement determines, perhaps obtain in advance foundation and described the 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 that direct transfers of setting up in advance, obtain and the second gateway between the tunnel that direct transfers.

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

The gateway that present embodiment provides, when carrying out service communication by the user at the user of the first subnet and the second subnet, the external interface of the first subnet is notified to core net, the communication service of judging the user of the user of described the first subnet and the second subnet in this core net is non-IMS Network, and when the external interface types of described the first subnet and described the 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 impact of IMS network, the processing procedure of communicating by letter between the two subnet users is simplified, calling out time-delay shortens, guarantee the Quality of experience of client communication between legacy network, saved simultaneously IMS network processes capacity.

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

Wherein, described the first gateway 901 is used for receiving the business request information by user's transmission of the first subnet; Transmitting described business request information to described core net communicator 902 also notifies the external interface types of described the first subnet 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 the 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 the second gateway 903;

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

Described the second gateway 903 is used for receiving 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 the 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 the first gateway 901; According to the described Indication message that direct transfers obtain and described the 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 the first gateway 901.

Communication system between the subnet that present embodiment provides, when carrying out service communication by the user at the user of the first subnet and the second subnet, obtain respectively the external interface types of described the first subnet and described the second subnet, and, communication service the user of the user who determines described the first subnet and described the second subnet is non-IMS Network, and when the external interface types of determining described the first subnet and described the second subnet is identical, send the Indication message that direct transfers to the first gateway or the second gateway respectively, and described the first gateway or described the 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 impact of IMS network, the processing procedure of communicating by letter between the two subnet users is simplified, calling out time-delay shortens, guarantee the Quality of experience of client communication between legacy network, saved simultaneously IMS network processes capacity.

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

The above; be the specific embodiment of the present invention only, but protection scope of the present invention is not limited to this, 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 the first gateway and the second gateway and core net; Described the first gateway connects respectively described core net and the first subnet; Described the second gateway connects respectively described core net and the second subnet;

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

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

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

Described core net is to described the second gateway transmission interface inquiry request message, and after receiving the interface query response message that is sent by described the second gateway, obtains the external interface types of described the 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 the first gateway or described the second gateway respectively and comprises:

Send the Indication message that direct transfers of the address that comprises described the second gateway to described the first gateway, and send the Indication message that direct transfers of the address that comprises described the first gateway to described the second gateway; Described the first gateway and described the 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 that direct transfers of setting up in advance.

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

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

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

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

Send the Indication message that direct transfers that comprises the Tunnel Identifier that direct transfers to described the first gateway; Described the first gateway is to the described Indication message that direct transfers of described the second gateway forwards; Described the first gateway and described the second gateway obtain the tunnel that direct transfers of setting up in advance 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 the first gateway and described the second gateway obtained the described tunnel that direct transfers, described the first gateway sent described business request information by the described tunnel that direct transfers to described the second gateway; Described the second gateway is transmitted to described the second subnet with described business request information.

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

Described the first gateway carries out communicating by letter of non-IMS Network by the described tunnel that direct transfers with described the second gateway, and described the first gateway, described core net and described the second gateway include in the IMS of network protocol multi-media system network.

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

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

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

Described the 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 the first gateway is notified the external interface types of the first subnet to core net and comprised:

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

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

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

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

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

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

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

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 the first subnet and described the second subnet is non-IMS Network, and when described the first subnet that definite described interface type acquiring unit obtains is identical with the external interface types of described the second subnet, send the Indication message that direct transfers to described the first gateway or the second gateway of connecting described the second subnet respectively, be used for described the first gateway or described the second gateway and obtain the tunnel that direct transfers that carries out each other described communication service, core net according to the described Indication message that direct transfers, described the first gateway and described the second gateway include in the IMS of network protocol multi-media system network.

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

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

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:

The tunnel communication unit, the tunnel that direct transfers that is used for obtaining by the described tunnel acquiring unit that direct transfers carries out communicating by letter of non-IMS Network with described the second gateway, and described gateway, described core net and described the second gateway include in the IMS of network protocol multi-media system network.

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

20. gateway according to claim 18 is characterized in that, described 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:

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

23. the communication system between a subnet, it is characterized in that, comprise the first gateway and core net communicator and the second gateway that is connected the second subnet that connect the first subnet, described the first gateway, described core net and described the second gateway include in the IMS of network protocol multi-media system network;