CN100450083C - Media-flow conversion address distribution method and media-flow conversion method - Google Patents

Abstract

The method includes following steps: after receiving message of building session, application function AF sends attribute message of media stream of session, which is carried by message for requesting conversion address, included in message of building session to strategic policy decision function SPDF based on service; based on received the attribute message of media stream of session, SPDF locates corresponding boundary gateway function BGF, and forwards the received message for requesting conversion address to the located BGF; responding received message for requesting conversion address, BGF assigns conversion address for media stream of session. The invention makes AF, SPDF and BGF partake functions more reasonably, lightens working load of SPDF and raises stability of conversion procedure of media stream address.

Description

Media stream transition address distribution method and Media Stream retransmission method thereof

Technical field

The present invention relates to Media Stream interaction technique field, relate in particular to a kind of media stream transition address distribution method and Media Stream retransmission method thereof.

Background technology

At present in communications network system, usually because factors such as shortage of ip address or security consideration need have been disposed a large amount of network address translation (NA (P) T, Network Address (Poft) Translation) equipment in access network; Simultaneously because different network domains might take different address fields between (just belonging to two different network domains respectively as China Mobile network and Chinese telecommunications network), so also need to carry out NA (P) T conversion when carrying out Media Stream communication between two heterogeneous networks territories, these can support that NA (P) the T equipment of NA (P) T translation function is that present existing communication system has been saved a large amount of IP address resources, thereby make various data services to carry out normally.

But; in communications network system because the existence of NA (P) T equipment; carry out in the Media Stream reciprocal process at calling and called; usually can change the IP address of the mutual Media Stream of calling and called owing to NA (P) T equipment; and isolate different address fields simultaneously; tend to like this cause because the home address still is original private IP address in the Media Stream, and the result can't be transmitted the medium streaming session foundation back Media Stream between the calling and called normally, communication can't be set up success.And at present prior art has proposed to solve the technical scheme of above-mentioned this problem, thereby making that mutual Media Stream can pass through different address fields between the calling and called carries out alternately, at present this solution is called NA (P) T crossing technology.

NA (P) the T crossing technology of main flow is to adopt ALG (ALG at present, Application LayerGateway) mode realizes, as application function (AF by signaling plane, Application Function) media stream message being carried out ALG handles, and the control loading end has the equipment of NA (P) T function (as Border Gateway Function BGF, Border Gateway Function) finishes the forwarding of Media Stream, thereby realize that NA (P) T passes through.

(the ETSI of ETSI, European Telecommunications Standards Institute) packet telecommunications network standard (TISPAN, Telecommunications and Internet ConvergedServices and Protocols for Advanced Networking) packet network architecture in, between application layer and transport layer, introduced resource admission control subsystem (RACS, Resource Admission ControlSub-system), to be used for the resource of unified management bearer network, and provide based on the strategy (comprise the allocated bandwidth strategy, priority policy, bandwidth whether enough strategy and whether allow call policy etc.) control, service quality (the QoS of bearer network wherein, Quantity of Service) and NA (P) T all to visit RACS, and control by RACS.Wherein the RACS framework of TISPAN definition as shown in Figure 1, wherein:

Resource admission control subsystem RACS mainly comprises the strategy decision function (SPDF based on business, Service-based Policy Decision Function) 2, core network Border Gateway Function (C-BGF, Core Border Gateway Function) 3, Access Layer resource admission control function (Access-Resource and Admission Control Function, Access-Resource and Admission Control Function) 4 and resource control implement function (RCEF, Resource Control Enforcement Function) 5, other parts have been explained the relation and the interface of related functional entities and RACS framework among the figure, wherein NA (P) T controlled function mainly is by AF 1, signalling interactive process between SPDF 2 and C-BGF 3 entities is realized, other is mainly used in as Access-Resource and Admission Control Function 4 entities and RCEF 5 entities Access Layer QoS resource is controlled, and the realization of NA (P) T relation is little.

Realize the generation of the Media Stream forwarding-table item between the calling and called based on the Signalling exchange between the AF among the resource admission control subsystem RACS 1, SPDF 2 and C-BGF 3 entities, and come conversation media stream mutual between the calling and called is transmitted based on the Media Stream forwarding-table item of this generation.The generative process of the Media Stream forwarding-table item between the wherein existing calling and called please refer to Fig. 2, and the concrete generative process of its Media Stream forwarding-table item comprises:

1, AF receives session and sets up message, wherein contains calling subscriber's conversation media stream information;

2, AF sends NA (P) T conversion requests information to SPDF;

3, SPDF responds NA (P) the T conversion requests that receives, and is caller conversation media flow distribution bearer network address resource information (as IP address and/or port numbers etc.), and will feeds back to AF for the IP address and/or the port numbers of caller conversation media flow distribution;

4, AF is revised as IP address and/or the port numbers that SPDF is a caller conversation media flow distribution with the media address of caller conversation media stream;

5, AF receives session and sets up message, wherein contains called subscriber's conversation media stream information;

6, AF sends NA (P) T conversion requests information to SPDF;

7, SPDF responds NA (P) the T conversion requests that receives, and is called conversation media flow distribution bearer network address resource information (as IP address and/or port numbers etc.), and will feeds back to AF for the IP address and/or the port numbers of called conversation media flow distribution;

8, AF is revised as IP address and/or the port numbers that SPDF is called conversation media flow distribution with the media address of called conversation media stream;

9, SPDF will be for the IP address of caller conversation media flow distribution and/or port numbers with for setting up mapping relations between the IP address of called conversation media flow distribution and/or the port numbers, thereby generates Media Stream forwarding-table item that should the calling and called conversation procedure.

Please continue with reference to Fig. 3, this figure has the processing procedure schematic diagram of calling and called conversation media stream being transmitted based on the Media Stream forwarding-table item that generates now, and its process that Media Stream is transmitted is specific as follows:

11, AF sends session to SPDF and sets up successful directive command after setting up the session connection success between the calling and called;

12, SPDF is receiving after session that AF sends sets up successful directive command, and the Media Stream forwarding-table item that issues generation is given C-BGF;

13, C-BGF stores the Media Stream forwarding-table item that SPDF issues; And, the Media Stream of sending in the calling and called session interaction process is carried out the conversion of IP address or port numbers, and the Media Stream after the conversion process is transmitted according to this Media Stream forwarding-table item;

14, AF sends the conversation end directive command to SPDF after the session interaction process between the calling and called finishes;

15, SPDF is released to the bearer network IP address or the port numbers of this calling and called allocated for media streams after receiving the conversation end directive command that AF sends;

16, SPDF issues the order of deletion Media Stream forwarding-table item to C-BGF;

17, C-BGF is after receiving the deletion Media Stream forwarding-table item order that SPDF sends, with storage to Media Stream forwarding-table item deletion that should the calling and called session interaction.

By said process as seen, in the prior art Media Stream in the calling and called session interaction process is carried out NA (P) T conversion process, need distribute (IP address or port numbers etc.) by the address resource of the C-BGF in control of the SPDF among the RACS and the management carrying networking, promptly need be by NA (P) the T conversion requests of SPDF according to the AF transmission, be respectively calling and called conversation media flow distribution IP address or port numbers, and will set up mapping relations for the IP address or the port numbers of calling and called conversation media flow distribution, generate the Media Stream forwarding-table item of corresponding calling and called session, the Media Stream forwarding-table item that follow-up foundation again generates is transmitted the Media Stream in the calling and called session interaction process, and but there is following defective in the mode of this realization Media Stream NA (P) T conversion process:

One, SPDF is used to finish the strategy decision function based on business, to operation layer shielding bearer network, and according to the request of operation layer and the resource situation of bearer network, decision is to the resource bid and the processing policy of bearer network, promptly only provide the processing policy function in essence, and also need not concrete bearer network resource be managed and control, so realize that based on this some control and the management function of calling and called conversation media stream NA (P) T are inappropriate on SPDF.

Two, on SPDF, realize calling and called conversation media stream is carried out control and the management function of NA (P) T, distribute with the address resource on the C-BGF in the management bearer network, will bring great work load and address resource stationary problem to SPDF: this is because C-BGF is positioned at network edge, a common SPDF can manage a plurality of C-BGF equipment simultaneously, and SPDF just need manage and control the media address resource on a plurality of C-BGF of self-management and control like this;

Each C-BGF also will report some the specific address informations of self SPDF (or being configured) on SPDF simultaneously, distribute to Media Stream in certain session again to avoid the SPDF address information that these are specific, thereby cause the address resource conflict, C-BGF handles problems such as confusion, in addition because the resource that SPDF need manage a plurality of C-BGF, in case so the resource management fault of SPDF will cause can't using of whole Internet resources, influence surface is bigger.

Three, because in session interaction process, may carry various types of media stream in caller Media Stream or the called Media Stream simultaneously, as comprising audio stream simultaneously, types such as video flowing, AF just need be respectively these dissimilar Media Streams and apply for media address information (as IP address or port numbers etc.) like this, and before between calling and called, notifying the self-contained Media Stream type of the other side mutually, the Media Stream number of types can't be determined, therefore AF just need safeguard the information of caller Media Stream and called Media Stream, so that a plurality of Media Streams between the calling and called are carried out correct coupling, and the derivation Media Stream forwarding-table item that these information can be very natural; If but in SPDF, finish management and the controlled function of Media Stream NA (P) T, also need the Media Stream address information between the calling and called to be mated and bind, to generate corresponding Media Stream forwarding-table item, therefore cause needing to repeat to realize that this same function (realizes that it is necessary that this function is set up reason for session and AF is last on SPDF and the AF, on the SPDF but be not), the result causes the repetition of processing capacity, and the implementation procedure more complicated of this function, also will expand more transmission information (as the descriptor of conversation media stream or the address information matching order in the calling and called conversation media etc.) to the interface between AF and the SPDF simultaneously, be inappropriate so therefore.

Summary of the invention

The technical problem to be solved in the present invention is to propose a kind of media stream transition address distribution method and Media Stream retransmission method thereof, so that the function sharing between AF, SPDF and the BGF is more reasonable, alleviate the work load of SPDF, improve the stability of Media Stream address translation process.

For addressing the above problem, the technical scheme that the present invention proposes is as follows:

A kind of media stream transition address distribution method comprises step:

After message is set up in application function AF reception session, the conversation media stream attribute information that comprises in the message is set up in session be carried on the strategy decision function SPDF that sends in the request message of reference address based on business;

Described SPDF is according to receiving the conversation media stream attribute information of carrying in the request message of described reference address, the Border Gateway Function BGF that the location is corresponding; And

The described reference address request message that receives is transmitted to the BGF that navigates to;

The reference address request message that the BGF response receives is described conversation media flow distribution reference address.

Wherein said conversation media stream attribute information is that the Media Stream address information that comprises in the message is set up in session.

Wherein said conversation media stream attribute information is the Virtual network operator sign that the Media Stream address information that comprises in the message and conversation media stream transmit leg place are set up in session.

The process of the BGF that described location is corresponding specifically comprises step:

Described SPDF sets in advance positioning strategy; And

Preestablish the mapping table between Media Stream address field and the Virtual network operator sign;

SPDF obtains corresponding Virtual network operator sign according to receiving the described mapping table of Media Stream index for address information that carries in the request message of described reference address; And

According to the Virtual network operator sign that obtains, determine the BGF group in the network of described conversation media stream transmit leg place;

SPDF locatees corresponding BGF according to Media Stream address information of carrying in the request message of described reference address and described positioning strategy in the BGF group who determines.

The process of the BGF that described location is corresponding specifically comprises step:

Described SPDF sets in advance positioning strategy; And

Preestablish Media Stream address field and BGF group's mapping table;

SPDF obtains corresponding BGF group according to receiving the described mapping table of Media Stream index for address information that carries in the request message of described reference address; And

According to Media Stream address information of carrying in the request message of described reference address and described positioning strategy, the corresponding BGF in location in the BGF group who determines.

The process of the BGF that described location is corresponding specifically comprises step:

Described SPDF sets in advance positioning strategy; And

According to the Virtual network operator sign that receives the conversation media stream transmit leg place of carrying in the request message of described reference address, determine the BGF group in the network of described conversation media stream transmit leg place;

SPDF locatees corresponding BGF according to Media Stream address information of carrying in the request message of described reference address and described positioning strategy in the BGF group who determines.

Described method also comprises step:

Described SPDF determines the address domain information of preliminery application in the BGF that navigates to according to the Media Stream address information of carrying in the request message of described reference address; And

The address domain information of the preliminery application determined is carried in the request message of described reference address sends to the BGF that navigates to;

Described BGF is the reference address in the described conversation media flow distribution corresponding address territory according to the address domain information that receives the preliminery application of carrying in the request message of reference address.

Also comprise the transmission direction identification parameter that is used to identify conversation media flow transmission direction in the wherein said conversation media stream attribute information.

Described method also comprises step:

Described SPDF determines the address domain information of preliminery application in the BGF that navigates to according to Media Stream address information of carrying in the request message of described reference address and transmission direction identification parameter; And

The address domain information of the preliminery application determined is carried in the request message of described reference address sends to the BGF that navigates to;

Described BGF is the reference address in the described conversation media flow distribution corresponding address territory according to the address domain information that receives the preliminery application of carrying in the request message of reference address.

Also comprise the session identification that is used to identify session in the wherein said conversation media stream attribute information.

Described method also comprises step:

Described SPDF sets up the mapping table between store session sign and the location BGF; And

Follow-up described SPDF is when the reference address request message that receives at same session, and according to the session identification that comprises in the conversation media stream attribute information of carrying in this reference address request message, the described mapping table of index obtains corresponding location BGF.

Described method also comprises step:

The described BGF that navigates to sets up the mapping table between store session sign and the reference address;

The follow-up BGF that navigates to is when the reference address request message that receives at same session, according to the session identification that comprises in the conversation media stream attribute information of carrying in this reference address request message, the described mapping table of index obtains corresponding reference address.

Wherein said Media Stream address information is the IP address; Or be IP address and port numbers.

Wherein said positioning strategy be in the BGF group who forms by a plurality of BGF BGF of picked at random as the location BGF strategy; Or

For in the BGF group who forms by a plurality of BGF, choosing the strategy of the maximum BGF of address space left resource as location BGF; Or

For in the BGF group who forms by a plurality of BGF, choosing the strategy of a BGF as location BGF with the priority polling; Or

For in the BGF group who forms by a plurality of BGF, choosing the strategy of the most idle BGF of a CPU as location BGF.

Wherein said Virtual network operator is designated access network operator sign or is backbone network operator sign.Described reference address is conversion IP address and/or end of convert slogan.

Accordingly, the invention allows for a kind of Media Stream retransmission method of realizing based on above-mentioned media stream transition address distribution method, comprise step:

Described AF is respectively the reference address information of calling and called conversation media flow distribution according to described BGF, sets up the corresponding relation between the calling and called conversation media stream translation address, generates Media Stream forwarding-table item that should the calling and called conversation procedure; And

After the calling and called session is set up successfully, send session to BGF and set up successful directive command and described Media Stream forwarding-table item;

Described BGF transmits processing according to the Media Stream forwarding-table item that receives to the Media Stream in the calling and called session interaction process.

Described method comprises that also reference address information that described BGF will be respectively calling and called conversation media flow distribution feeds back to the step of described AF by described SPDF.

Wherein said AF by described SPDF session is created as the merit directive command and the Media Stream forwarding-table item sends to BGF.

Described method also comprises the step that described BGF stores the Media Stream forwarding-table item that receives.

Described method also comprises step:

Described AF sends the conversation end directive command to described BGF after calling and called session interaction process finishes;

Described BGF is after receiving described conversation end directive command, and the Media Stream forwarding-table item deletion with storage discharges the reference address information that takies in the described Media Stream forwarding-table item.

Wherein said AF finishes directive command by described SPDF with session and sends to BGF.Described reference address information is conversion IP address or end of convert slogan.

In addition, the invention allows for a kind of Media Stream retransmission method of realizing based on the described media stream transition address distribution method of claim 1, comprise step:

Described BGF sets up the corresponding relation between the calling and called conversation media stream translation address respectively according to be the reference address information of calling and called conversation media flow distribution, and generation is to Media Stream forwarding-table item that should the calling and called conversation procedure; And

After the calling and called session is set up successfully, receive session that described AF sends when setting up successful directive command, according to the Media Stream forwarding-table item of being set up the Media Stream in the calling and called session interaction process is transmitted processing.

Wherein said AF is created as the merit directive command by described SPDF with session and is transmitted to BGF.

Described method also comprises the step that described BGF stores the Media Stream forwarding-table item of setting up.

Described method also comprises step:

Described AF sends the conversation end directive command to described BGF after calling and called session interaction process finishes;

Described BGF is after receiving described conversation end directive command, and the Media Stream forwarding-table item deletion with storage discharges the reference address information that takies in the described Media Stream forwarding-table item.

Wherein said AF transmits the conversation end directive command by described SPDF to described BGF.The beneficial effect that the present invention can reach is as follows:

Media stream transition address distribution method of the present invention sends to SPDF by by AF the attribute information of session Media Stream being encapsulated in the request message of reference address, so that SPDF can be according to the corresponding BGF in conversation media stream attribute information location that receives reference address request message encapsulation, and the reference address solicited message is transmitted to the BGF that navigates to, by this BGF is conversation media flow distribution reference address information, thereby realized that SPDF only needs reference address resource (as IP address and/or port numbers etc.) is carried out policy control, and really conversation media stream is carried out reference address resource control and allocation process by the BGF of correspondence, thereby alleviated the work load of SPDF for realizing conversation media stream translation address resource is controlled and managed, the resource of distributing and managing oneself by BGF oneself, management is simple, even certain BGF resource pool is made mistakes, can not exert an influence to whole network yet.

Media Stream retransmission method of the present invention does not distribute on the basis of reference address resource being respectively calling and called conversation media flow point by corresponding BGF, generate corresponding Media Stream forwarding-table item by AF or BGF itself according to calling and called media stream transition address information, and SPDF only is responsible for the corresponding strategies according to configuration information decision NA (P) T of the solicited message of operation layer AF and bearer network BGF, follow-up in the session interaction process, AF is handed down to BGF (if generate forwarding-table item by BGF with the forwarding-table item that generates, then need not AF and issue the Media Stream forwarding-table item to BGF), according to the Media Stream forwarding-table item Media Stream in the calling and called session interaction process is transmitted processing by BGF; Thereby avoided generating the work load of forwarding-table item by SPDF, the corresponding work load of SPDF that also alleviated for realizing conversation media stream translation address resource is controlled and managed, improved whole system stability.

Description of drawings

Fig. 1 is the RACS architectural configurations schematic diagram of TISPAN definition;

Fig. 2 is the generative process schematic diagram of the Media Stream forwarding-table item between the existing calling and called;

Fig. 3 has the processing procedure schematic diagram of calling and called conversation media stream being transmitted based on the Media Stream forwarding-table item that generates now;

Fig. 4 handles schematic diagram for the main realization principle of media stream transition address distribution method of the present invention;

Fig. 5 is the specific implementation principle processing procedure schematic diagram of Media Stream retransmission method of the present invention;

Fig. 6 is the other configuration transitions of calling and called conversation media flow point address for the present invention, and the concrete enforcement processing procedure schematic diagram that calling and called interactive media stream is transmitted.

Embodiment

The design philosophy of media stream transition address distribution method of the present invention is by the SPDF in the RACS framework allocation strategy of media stream transition address to be controlled, SPDF is an allocated for media streams reference address information according to the selected corresponding BGF of policy control result, to alleviate the work load that SPDF is the allocated for media streams reference address; The design philosophy of Media Stream retransmission method of the present invention is the reference address information that is respectively calling and called conversation media flow distribution by the AF in the RACS framework according to BGF, set up the Media Stream forwarding-table item of corresponding calling and called session interaction process, perhaps be respectively the reference address information of calling and called conversation media flow distribution by BGF basis itself, set up the Media Stream forwarding-table item of corresponding calling and called session interaction process, to alleviate the work load that SPDF sets up the Media Stream forwarding-table item; Thereby can be so that the distribution of the function of the AF/SPDF/BGF in the RACS framework is more reasonable.

Below in conjunction with each accompanying drawing specific implementation principle of the present invention and embodiment thereof are carried out detailed narration.Please refer to Fig. 4, this figure is that the main realization principle of media stream transition address distribution method of the present invention is handled schematic diagram, and its specific implementation principle is as follows:

Step S1, application function AF receives the session that comprises Media Stream descriptor (can be calling party's medium stream information, also can be callee's medium stream information) and sets up message;

Step S2, AF is to the reference address request message that sends the conversation media stream attribute information that carries reception based on the strategy decision function SPDF of business;

Wherein the AF conversation media stream attribute information of carrying in the reference address request message that SPDF sends can comprise the Media Stream address information (the IP address information that comprises Media Stream, or the IP address and the port number information of Media Stream) of the user in the Media Stream descriptor entrained in the conversation message; The Media Stream address information and the conversation media stream transmit leg place Virtual network operator sign that perhaps comprise the user in the Media Stream descriptor entrained in the conversation message; Wherein send session and set up the transmit leg user of message and can be in the Access Network, then the Virtual network operator sign here just identifies for access network operator; In addition, the transmit leg user that message is set up in the transmission session also can be in the backbone network, and then the Virtual network operator sign here just is a backbone network operator sign.

The conversation media stream attribute information of carrying in the reference address request message that step S3, SPDF send according to AF is located corresponding Border Gateway Function BGF;

(be the IP address information of Media Stream wherein if the conversation media stream attribute information of carrying in the reference address request message sent of AF is the Media Stream address information of the user in the Media Stream descriptor entrained in the conversation message; Or the IP address information of Media Stream and port number information etc.), then the detailed process of the BGF of SPDF location correspondence can be as follows:

1) SPDF sets in advance positioning strategy;

2) while SPDF preestablishes the mapping table between Media Stream address field (being Media Stream IP address field) and the Virtual network operator sign;

3) follow-up, the Media Stream address information of carrying in the reference address request message that SPDF sends according to AF (is a Media Stream IP address information; Or medium flow IP address and port number information etc.) index 2) in mapping table between predefined Media Stream address field and the Virtual network operator, thereby obtain corresponding Virtual network operator sign;

4) SPDF is according to the above-mentioned Virtual network operator sign that obtains, determine that BGF group in the network of this conversation media stream transmit leg place is (because in the same access network or can be provided with a plurality of BGF simultaneously in the same backbone network, thereby form BGF group, like this when SPDF acquires the sign of the transmit leg place Virtual network operator that sends this conversation media stream, will know the access network or the backbone network at conversation media stream transmit leg place according to the Virtual network operator of this acquisition sign, thus the BGF group who forms by a plurality of BGF that can be determined in the corresponding access network or comprise in the corresponding backbone network);

5) then, the Media Stream address information of carrying in the reference address request message that SPDF sends according to AF again (is a Media Stream IP address information; Or medium flow IP address and port number information etc.) and above-mentioned 1) in the positioning strategy that set in advance, above-mentioned 4) in the BGF of the correspondence in location among the BGF group that determines.

Accordingly, can also adopt following process:

11) SPDF sets in advance positioning strategy;

12) while SPDF preestablishes the mapping table between Media Stream address field (being Media Stream IP address field) and the BGF group;

13) follow-up, the Media Stream address information of carrying in the reference address request message that SPDF sends according to AF (is a Media Stream IP address information; Or medium flow IP address and port number information etc.) index 12) in mapping table between predefined Media Stream address field and the BGF group, thereby obtain corresponding BGF group;

14) then, the Media Stream address information of carrying in the reference address request message that SPDF sends according to AF again (is a Media Stream IP address information; Or medium flow IP address and port number information etc.) and above-mentioned 11) in the positioning strategy that set in advance, above-mentioned 13) in the BGF of the correspondence in location among the BGF group that determines.

(be Media Stream IP address information wherein if the conversation media stream attribute information of carrying in the reference address request message sent of AF is the Media Stream address information of the user in the Media Stream descriptor entrained in the conversation message; Or medium flow IP address and port number information etc.) and during the sign of conversation media stream transmit leg place Virtual network operator, then the detailed process of the corresponding BGF in SPDF location can be as follows:

21) SPDF sets in advance positioning strategy;

The Virtual network operator sign at the conversation media stream transmit leg place of 22) carrying in the reference address request message that SPDF sends according to AF determines that this conversation media flows the BGF group in the network of transmit leg place;

23) positioning strategy that sets in advance the Media Stream address information and above-mentioned 11 of carrying in the reference address request message that SPDF sends according to AF again) is above-mentioned 22) in the BGF of the correspondence in location among the BGF group that determines.

Wherein above-mentioned 1) in, 11) in or 21) in mentioned BGF positioning strategy can but be not limited to the wherein a kind of of following BGF positioning strategy:

The BGF positioning strategy be in the BGF group who forms by a plurality of BGF BGF of picked at random as the location BGF strategy; Or

For in the BGF group who forms by a plurality of BGF, choosing the strategy of the maximum BGF of address space left resource as location BGF; Or

For in the BGF group who forms by a plurality of BGF, choosing the strategy of a BGF as location BGF with the priority polling; Or

For in the BGF group who forms by a plurality of BGF, choosing the strategy of the most idle BGF of a CPU as location BGF.

Step S4, the reference address request message that SPDF sends AF is transmitted to the BGF that the location obtains among the above-mentioned steps S3;

Step S5, the reference address request message that the BGF response that this location obtains receives is this conversation media flow distribution reference address information (promptly be used for the address information that the conversation media circulation is sent out, comprise conversion IP address and/or end of convert slogan etc.).

Wherein the Media Stream address information of carrying in the reference address request message that SPDF can also and then send according to AF (is a Media Stream IP address information; Or medium flow IP address and port number information etc.) determine the address field resource (i.e. the IP address resource territory of preliminery application and/or port resource territory in the above-mentioned BGF that is determined to) of preliminery application in the BGF that navigates to; In addition, can also in the reference address request message that AF sends, increase the transmission direction identification parameter that is used to identify conversation media flow transmission direction, as to use this conversation media stream of UP parametric representation be to mail to network from the user, with this conversation media stream of DOWN parametric representation from the network destined user, the address field resource (i.e. the IP address resource territory of preliminery application and/or port resource territory in the above-mentioned BGF that is determined to) that Media Stream address information of carrying in SPDF and then the reference address request message sent according to AF and transmission direction identification parameter (UP/DOWN) are determined preliminery application in the BGF that navigates to;

SPDF is carried on the address domain information of above-mentioned definite preliminery application in the reference address request message that AF sends and sends to the BGF that the location obtains then;

The BGF that obtains of location is again according to the address domain information of the preliminery application of carrying in the reference address request message that receives, be the reference address in this conversation media flow distribution corresponding address territory (promptly the address domain information of the preliminery application of carrying in the reference address request message that the BGF that obtains of location sends according to SPDF to select in the corresponding IP address field of self and/or in the corresponding port territory IP address and/or port to distribute to this conversation media stream as the reference address).

Can also and then comprise the session identification that is used to identify session in the wherein above-mentioned conversation media stream attribute information; SPDF can set up the mapping table between storage meeting respective session Media Stream sign and the location BGF at every turn when navigating to BGF like this; When receiving the reference address request message at same conversation media stream once more at follow-up SPDF, just can be according to the session identification that comprises in the conversation media stream attribute information of carrying in this reference address request message, come the mapping table of the above-mentioned foundation of index, obtain corresponding location BGF, thereby improve the speed of location BGF.

In like manner, the BGF that navigates to for the conversation media flow distribution behind the reference address, just can will store mapping table for setting up between the session identification of the reference address of this conversation media flow distribution and this session; Like this when the follow-up BGF that navigates to receives reference address request message at same session once more, just can be according to the session identification that comprises in the conversation media stream attribute information of carrying in this reference address request message, the mapping table that index is set up, find corresponding reference address, thereby improve the distribution speed of conversation media stream translation address.

Please refer to Fig. 5, this figure is the specific implementation principle processing procedure schematic diagram of Media Stream retransmission method of the present invention, and its specific implementation principle is as follows:

Step S11, media stream transition address distribution method according to the invention described above proposition, be respectively the reference address information (can for conversion IP address or for the end of convert slogan etc.) of calling and called conversation media flow distribution correspondence by BGF, and give SPDF by the reference address feedback information that BGF will be respectively calling and called conversation media flow distribution;

Step S12, SPDF is with the reference address information that is respectively calling and called conversation media flow distribution of BGF feedback and then feed back to AF;

Step S13, AF makes amendment to the media address of calling and called conversation media stream respectively according to the reference address information that the BGF that receives is respectively calling and called conversation media flow distribution;

Step S14, simultaneously, AF is respectively the reference address information of calling and called conversation media flow distribution according to the BGF that receives, and sets up the corresponding relation between the calling and called conversation media stream translation address, generates Media Stream forwarding-table item that should the calling and called conversation procedure.

Step S15, follow-up, after the calling and called session was set up successfully, AF sent session to SPDF and sets up successful directive command, simultaneously the Media Stream forwarding-table item of setting up among the above-mentioned steps S14 is sent to SPDF;

Step S16, successful directive command is set up in the session that receives to SPDF and the Media Stream forwarding-table item is transmitted to BGF;

Step S17, BGF stores the Media Stream forwarding-table item that receives, and according to the Media Stream forwarding-table item of this reception the Media Stream in the calling and called session interaction process is transmitted processing simultaneously.

Step S18, follow-up, AF sends the conversation end directive command to SPDF once more after calling and called session interaction process finishes;

Step S19, SPDF is transmitted to BGF with the conversation end directive command that receives;

Step S20, BGF after receiving the conversation end directive command, with self storage to Media Stream forwarding-table item deletion that should calling and called session interaction process, discharge the reference address resource that takies in this Media Stream forwarding-table item.

Wherein can also set up the corresponding relation between the calling and called conversation media stream translation address, generate Media Stream forwarding-table item that should the calling and called conversation procedure by BGF respectively according to being the reference address information of calling and called conversation media flow distribution;

It is follow-up after the calling and called session is set up successfully, AF sends session by SPDF to the BGF that navigates to and sets up successful directive command, the BGF that navigates to transmits processing according to the above-mentioned Media Stream forwarding-table item of setting up to the Media Stream in the calling and called session interaction process receiving session that AF sends when setting up successful directive command.

BGF and then can store wherein for the Media Stream forwarding-table item that calling and called session interaction process is set up, like this after follow-up calling and called session interaction process finishes, AF sends the conversation end directive command by SPDF to the BGF that navigates to, BGF is after receiving the conversation end directive command, with the Media Stream forwarding-table item deletion of storage, to discharge the reference address resource that takies in should the Media Stream forwarding-table item of calling and called session interaction process to resource pool.

The specific implementation process that combines of media stream transition address distribution method that the present invention is proposed and Media Stream retransmission method is described in detail below, please refer to Fig. 6, this figure is that the present invention is the other configuration transitions of calling and called conversation media flow point address, and the concrete enforcement processing procedure schematic diagram that calling and called interactive media stream is transmitted, it is as follows that it specifically implements processing procedure:

Step S100, AF receives calling party's session and sets up message;

Step S101, AF triggers the reference address request;

Step S102, the session that AF sends the calling party is set up the Media Stream attribute information that comprises in the message and is carried on the reference address request message and sends to SPDF; Wherein AF sends to calling party's conversation media stream attribute information of carrying in the reference address request message of SPDF and comprises that the Media Stream address information is (for the medium flow IP address; Or be medium flow IP address or port numbers etc.) and calling part user belonging network operator sign (optional);

Step S103, SPDF locatees the BGF of a correspondence according to Media Stream address information of carrying in the reference address request message that receives and Virtual network operator sign, and determines the address field resource information of preliminery application in the BGF that this navigates to; Wherein SPDF is according to the Media Stream address information and the concrete BGF of Virtual network operator mark location that carry in the reference address request message that receives, and the process of the preliminery application address field resource of definite correspondence elaborates at said process in the BGF that navigates to, and no longer too much gives unnecessary details here.

Step S104, SPDF is transmitted to the BGF that navigates to the address transition request message that AF sends, and wherein carries the address field resource information of preliminery application in this BGF in the reference address request message of Zhuan Faing;

Step S105, the address field resource information of the preliminery application of carrying in the reference address request message that this BGF that navigates to sends according to SPDF is reference address information of this calling party's conversation media flow distribution (conversion IP address and/or an end of convert slogan etc.) in self corresponding address territory resource;

Step S106, this BGF that navigates to carries the reference address information (conversion IP address and/or end of convert slogan etc.) of this BGF for calling party's conversation media flow distribution to SPDF feedback reference address request response in the reference address request response of this feedback;

Step S107, SPDF will receive carries BGF for the reference address request response of the reference address information of calling party's conversation media flow distribution and then feed back to AF;

Step S108, message is set up in the session that AF receives the callee, and (wherein the AF session that receives the calling party session of setting up message and receiving the callee is set up message and is not had sequencing, here just for convenience for the purpose of), follow-up repeating step S101 is to the processing procedure of step S107, realizing that BGF is callee's conversation media flow distribution reference address information, and the reference address information that will distribute to the callee feeds back to AF by SPDF;

Step S109, AF are the reference address information of calling and called conversation media flow distribution according to the BGF that receives respectively, and the reference address between coupling and the binding calling and called generates Media Stream forwarding-table item that should calling and called session interaction process.

Step S110, follow-up, the session interaction between the calling and called is set up successfully;

Step S111, the AF triggering session is set up successfully request;

Step S112, AF sends session to SPDF and sets up successful directive command, be used for setting up successfully to SPDF indication session, wherein to the session of SPDF transmission set up carry in the successful directive command message AF generation to Media Stream forwarding-table item that should calling and called session interaction process;

Step S113, the session that carries the Media Stream forwarding-table item that SPDF will receive is set up successful directive command forwards and is given corresponding BGF;

Step S114, BGF sets up the Media Stream forwarding-table item that carries in the successful directive command message with the session that receives and is issued to and transmits, and according to the reference address information in this Media Stream forwarding-table item the Media Stream in the calling and called session interaction process is carried out media address coupling, conversion and Media Stream and transmit and handle.

Step S115, follow-up, the session interaction process between the calling and called finishes;

Step S116, the AF triggering session finishes indication request;

Step S117, AF sends the conversation end directive command to SPDF, is used for to SPDF indication conversation end, and the relevant information of indication SPDF deletion and this calling and called session interaction procedure correlation;

After step S118, SPDF receive the conversation end directive command, delete that self set up and relevant information this calling and called session interaction procedure correlation (as the corresponding strategies information of locating corresponding BGF etc.);

Step S119, SPDF transmits the conversation end directive command that AF sends, to indicate the corresponding BGF deletion and the relevant information of this calling and called session interaction procedure correlation;

Step S120, after BGF receives the conversation end directive command, will be in transmitting to Media Stream forwarding-table item deletion that should the calling and called session interaction, to discharge the address pool of the shared reference address resource of this Media Stream forwarding-table item (IP address resource or port resource etc.) to the place.

Step S121, BGF is to SPDF feeding back conversation ending request response message;

Step S122, SPDF and then the conversation end request response that receives fed back to AF.

As fully visible, the RACS model of the TISPAN that media stream transition address distribution method of the present invention and Media Stream retransmission method thereof are applied in can be a model to access network, be that AF/SPDF/BGF is between access network and core network, can also be the model that is used for carrying out between the backbone network NA (P) T conversion, promptly AF/SPDF/BGF be positioned at the border of different core network; Like this when corresponding access network model, AF just identifies (as XXX@ access network sign etc.) for access network operator to optional network specific digit operator sign that SPDF sends in the above-mentioned flow process, during as corresponding backbone network model, AF just identifies (XXX@ backbone network sign etc.) for backbone network operator to the optional network specific digit operator sign that SPDF sends in the above-mentioned flow process;

It in the principle of the invention media stream transition address information of mating and binding the calling and called session interaction by AF, to generate the Media Stream forwarding-table item of corresponding calling and called session interaction, and the Media Stream forwarding-table item that generates is handed down to SPDF, and pass through BGF by SPDF; Also can directly mate and bind the media stream transition address information of calling and called session interaction by BGF, to generate the Media Stream forwarding-table item of corresponding calling and called session interaction.

The present invention program's principle both can be used for the conversion between the different IP v4 address field, also can be used for the conversion between the different address formats such as IPv4 and IPv6.

In the actual session reciprocal process of calling and called, AF/SPDF/BGF in the principle of the invention may at first carry out the reference address allocation process of callee's conversation media stream, carry out the reference address allocation process of calling party's conversation media stream again, also might only carry out the allocation process of reference address the wherein side in the calling and called; Follow-uply also might upgrade the reference address of distributing to conversation media stream, processing such as part deletion, its processing thinking and principle and foregoing description are same or similar.

The present invention program's principle promptly can be used for the TISPAN network architecture of ETSI definition, also can be used in other similar network frame models of 3GPP network frame or ITU-T definition.

In sum, media stream transition address distribution method of the present invention and Media Stream retransmission method thereof proposed a kind ofly to realize that between AF and BGF NA (P) T passes through the processing scheme of function after more reasonably introducing the RACS framework, and it is more reasonable to make function between the functional entitys such as AF, SPDF and BGF divide;

Its function is divided and more rationally is embodied in the address resource that BGF self only needs management oneself, and be corresponding conversation media flow distribution reference address information according to administrative situation, and SPDF only is responsible for the allocation strategy of reference address resource, be the selected corresponding BGF of conversation media stream promptly according to the conversation media stream attribute, by selected BGF is conversation media flow distribution reference address information, therefore having alleviated SPDF is the live load of conversation media flow distribution reference address, thereby can avoid and to paralyse owing to the SPDF task is overweight, cause the repeating process failure of whole session Media Stream;

Simultaneously, its function is divided and more rationally is also embodied in the reference address resource information of being mated and being bound calling and called conversation media stream by AF, to set up the Media Stream forwarding-table item of corresponding calling and called session interaction process; Or the reference address resource information of directly mating and binding calling and called conversation media stream by BGF, to set up the Media Stream forwarding-table item of corresponding calling and called session interaction process; Thereby also avoided SPDF to go up the redundancy feature that is provided with, and reduced the agreement transmission complexity of SPDF.

Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims (28)

1, a kind of media stream transition address distribution method is characterized in that, comprises step:

After message is set up in application function AF reception session, the conversation media stream attribute information that comprises in the message is set up in session be carried on the strategy decision function SPDF that sends in the request message of reference address based on business;

Described SPDF is according to receiving the conversation media stream attribute information of carrying in the request message of described reference address, the Border Gateway Function BGF that the location is corresponding; And

The described reference address request message that receives is transmitted to the BGF that navigates to;

The reference address request message that the BGF response receives is described conversation media flow distribution reference address.

2, the method for claim 1 is characterized in that, described conversation media stream attribute information is that the Media Stream address information that comprises in the message is set up in session.

3, the method for claim 1 is characterized in that, described conversation media stream attribute information is the Virtual network operator sign that the Media Stream address information that comprises in the message and conversation media stream transmit leg place are set up in session.

4, method as claimed in claim 2 is characterized in that, the process of the BGF that described location is corresponding specifically comprises step:

Described SPDF sets in advance positioning strategy; And

Preestablish the mapping table between Media Stream address field and the Virtual network operator sign;

SPDF obtains corresponding Virtual network operator sign according to receiving the described mapping table of Media Stream index for address information that carries in the request message of described reference address; And

According to the Virtual network operator sign that obtains, determine the BGF group in the network of described conversation media stream transmit leg place;

SPDF locatees corresponding BGF according to Media Stream address information of carrying in the request message of described reference address and described positioning strategy in the BGF group who determines.

5, method as claimed in claim 2 is characterized in that, the process of the BGF that described location is corresponding specifically comprises step:

Described SPDF sets in advance positioning strategy; And

Preestablish Media Stream address field and BGF group's mapping table;

SPDF obtains corresponding BGF group according to receiving the described mapping table of Media Stream index for address information that carries in the request message of described reference address; And

According to Media Stream address information of carrying in the request message of described reference address and described positioning strategy, the corresponding BGF in location in the BGF group who determines.

6, method as claimed in claim 3 is characterized in that, the process of the BGF that described location is corresponding specifically comprises step:

Described SPDF sets in advance positioning strategy; And

According to the Virtual network operator sign that receives the conversation media stream transmit leg place of carrying in the request message of described reference address, determine the BGF group in the network of described conversation media stream transmit leg place;

SPDF locatees corresponding BGF according to Media Stream address information of carrying in the request message of described reference address and described positioning strategy in the BGF group who determines.

7, as claim 2,3,4,5 or 6 described methods, it is characterized in that, also comprise step:

Described SPDF determines the address domain information of preliminery application in the BGF that navigates to according to the Media Stream address information of carrying in the request message of described reference address; And

The address domain information of the preliminery application determined is carried in the request message of described reference address sends to the BGF that navigates to;

Described BGF is the reference address in the described conversation media flow distribution corresponding address territory according to the address domain information that receives the preliminery application of carrying in the request message of reference address.

8, as claim 2,3,4,5 or 6 described methods, it is characterized in that, also comprise the transmission direction identification parameter that is used to identify conversation media flow transmission direction in the described conversation media stream attribute information.

9, method as claimed in claim 8 is characterized in that, also comprises step:

Described SPDF determines the address domain information of preliminery application in the BGF that navigates to according to Media Stream address information of carrying in the request message of described reference address and transmission direction identification parameter; And

The address domain information of the preliminery application determined is carried in the request message of described reference address sends to the BGF that navigates to;

Described BGF is the reference address in the described conversation media flow distribution corresponding address territory according to the address domain information that receives the preliminery application of carrying in the request message of reference address.

10, as claim 1,2,3,4,5 or 6 described methods, it is characterized in that, also comprise the session identification that is used to identify session in the described conversation media stream attribute information.

11, method as claimed in claim 10 is characterized in that, also comprises step:

Described SPDF sets up the mapping table between store session sign and the location BGF; And

Follow-up described SPDF is when the reference address request message that receives at same session, and according to the session identification that comprises in the conversation media stream attribute information of carrying in this reference address request message, the described mapping table of index obtains corresponding location BGF.

12, method as claimed in claim 10 is characterized in that, also comprises step:

The described BGF that navigates to sets up the mapping table between store session sign and the reference address;

The follow-up BGF that navigates to is when the reference address request message that receives at same session, according to the session identification that comprises in the conversation media stream attribute information of carrying in this reference address request message, the described mapping table of index obtains corresponding reference address.

As claim 2,3,4,5 or 6 described methods, it is characterized in that 13, described Media Stream address information is the IP address; Or be IP address and port numbers.

14, as claim 4,5 or 6 described methods, it is characterized in that, described positioning strategy be in the BGF group who forms by a plurality of BGF BGF of picked at random as the location BGF strategy; Or

For in the BGF group who forms by a plurality of BGF, choosing the strategy of the maximum BGF of address space left resource as location BGF; Or

For in the BGF group who forms by a plurality of BGF, choosing the strategy of a BGF as location BGF with the priority polling; Or

For in the BGF group who forms by a plurality of BGF, choosing the strategy of the most idle BGF of a CPU as location BGF.

As claim 3,4 or 6 described methods, it is characterized in that 15, described Virtual network operator is designated access network operator sign or is backbone network operator sign.

16, method as claimed in claim 12 is characterized in that, described reference address is conversion IP address and/or end of convert slogan.

17, a kind of Media Stream retransmission method of realizing based on the described media stream transition address distribution method of claim 1 is characterized in that, comprises step:

Described AF is respectively the reference address information of calling and called conversation media flow distribution according to described BGF, sets up the corresponding relation between the calling and called conversation media stream translation address, generates Media Stream forwarding-table item that should the calling and called conversation procedure; And

After the calling and called session is set up successfully, send session to BGF and set up successful directive command and described Media Stream forwarding-table item;

Described BGF transmits processing according to the Media Stream forwarding-table item that receives to the Media Stream in the calling and called session interaction process.

18, method as claimed in claim 17 is characterized in that, comprises that also reference address information that described BGF will be respectively calling and called conversation media flow distribution feeds back to the step of described AF by described SPDF.

19, method as claimed in claim 17 is characterized in that, described AF by described SPDF session is created as the merit directive command and the Media Stream forwarding-table item sends to BGF.

20, method as claimed in claim 17 is characterized in that, also comprises the step that described BGF stores the Media Stream forwarding-table item that receives.

21, method as claimed in claim 20 is characterized in that, also comprises step:

Described AF sends the conversation end directive command to described BGF after calling and called session interaction process finishes;

Described BGF is after receiving described conversation end directive command, and the Media Stream forwarding-table item deletion with storage discharges the reference address information that takies in the described Media Stream forwarding-table item.

22, method as claimed in claim 21 is characterized in that, described AF finishes directive command by described SPDF with session and sends to BGF.

As claim 17,18 or 21 described methods, it is characterized in that 23, described reference address information is conversion IP address or end of convert slogan.

24, a kind of Media Stream retransmission method of realizing based on the described media stream transition address distribution method of claim 1 is characterized in that, comprises step:

Described BGF sets up the corresponding relation between the calling and called conversation media stream translation address respectively according to be the reference address information of calling and called conversation media flow distribution, and generation is to Media Stream forwarding-table item that should the calling and called conversation procedure; And

After the calling and called session is set up successfully, receive session that described AF sends when setting up successful directive command, according to the Media Stream forwarding-table item of being set up the Media Stream in the calling and called session interaction process is transmitted processing.

25, method as claimed in claim 24 is characterized in that, described AF is created as the merit directive command by described SPDF with session and is transmitted to BGF.

26, method as claimed in claim 24 is characterized in that, also comprises the step that described BGF stores the Media Stream forwarding-table item of setting up.

27, method as claimed in claim 26 is characterized in that, also comprises step:

Described AF sends the conversation end directive command to described BGF after calling and called session interaction process finishes;

Described BGF is after receiving described conversation end directive command, and the Media Stream forwarding-table item deletion with storage discharges the reference address information that takies in the described Media Stream forwarding-table item.

28, method as claimed in claim 27 is characterized in that, described AF transmits the conversation end directive command by described SPDF to described BGF.

Images