CN1838631A

CN1838631A - Media proxy selecting method

Info

Publication number: CN1838631A
Application number: CNA2005100555970A
Authority: CN
Inventors: 姚鑫; 张瑞
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2005-03-22
Filing date: 2005-03-22
Publication date: 2006-09-27
Anticipated expiration: 2025-03-22
Also published as: CN100442762C

Abstract

The disclosed selection method for media proxy comprises: a) after receiving the call signaling message from user terminal, the signaling proxy acquires the address information of calling and called terminals from the message to look up the relation of address information and physical location and obtain the opposite terminal position; b) then, it look up the relation between media proxy and its physical position to obtain every media proxy physical location information; c) with former results, it compares the calling and called terminals with their physical position, and selects the nearest proxy to process current business.

Description

A kind of system of selection of Media proxy

Technical field

The present invention relates to the distribution technique of Media proxy, be meant the method for under Xin Lingdaili and situation that Media proxy separates, selecting Media proxy especially.

Background technology

Along with Internet protocol (IP, Internet Protocol) technology is increasingly mature, with soft switch and IP packet-switch technology is the next generation network (NGN of core, Next Generation Network) technology, because it has broad application prospects and can satisfy people's variation, personalized business demand, become one of focus that industry pays close attention to most.

Session Border Controller (SBC, Session Border Controller) is one of visual plant among the NGN as Xin Lingdaili and media agent device.The typical networking model of SBC in the NGN network be referring to shown in Figure 1, is made up of agency's (PROXY) server and connected database (DATA), and PROXY is connected to each user terminal and server in the network by IP network.

The function of general SBC mainly comprises: Xin Lingdaili (SP, Signaling Proxy) and Media proxy (MP, Media Proxy).

When carrying out the Xin Lingdaili function, SBC can be regarded as soft switchcall server concerning the NGN user terminal, and the registration of user terminal and message related to calls all can be issued SBC earlier, and SBC is through being transmitted to the core soft switchcall server among the NGN after the signaling process; Meanwhile, SBC can be regarded as user terminal again concerning the core soft switchcall server, and the core soft switchcall server at first will be called out called request and issue SBC, and SBC is transmitted to real called user terminal again through after the signaling process.General SBC need support session preliminary agreement (SIP, Session Initiation Protocol), H.323, MGCP (MGCP, Media gateway control protocol), H.248 wait one or more agent functionalitys in the agreement.Because SBC has participated in user terminal and the mutual whole flow process of core soft switchcall server, so SBC can obtain details such as corresponding user's registration, calling.

SBC also carries out simultaneously the agency of Media Stream, and all Media Streams by SBC agency's user terminal and extraneous intercommunication all pass through SBC and handle and transmit.When the user terminal under the SBC during as caller, the called SBC that all comes from that is seen; When the user terminal under the SBC when called, the called address that call subscriber terminal is seen is the address of SBC.

The interactive mode of signaling flow and Media Stream is referring to shown in Figure 1, and dotted line is represented signaling flow among the figure, and solid line is represented Media Stream, and the signaling flow of user terminal is handled to server by SBC, and Media Stream also carries out transfer by SBC simultaneously.Usually, the flow of signaling flow is less, and a general calling is greatly about about 10 signaling messages; Then big many of the flow of Media Stream, will have 30～50 messages a general second.

So just caused the asymmetric of signaling traffic and medium flow.For normally carrying out of guaranteeing to converse, SBC must guarantee that signaling message and media message can both in time obtain handling, and the number of conversing when SBC can handle so mainly is subject to the disposal ability of media message.Therefore, jumbo SBC adopts distributed treatment usually, referring to shown in Figure 2, is made up of one or more Xin Lingdaili equipment SP and one or more media agent device MP among the PROXY.SP finishes the Xin Lingdaili function, and MP finishes the Media Stream agent functionality.Because the relative Media Stream of signaling traffic is much smaller,, so just signaling traffic and the unbalanced problem of medium flow have been solved so SP can be simultaneously and a plurality of MP collaborative works.

In distributed SBC, each SP and MP can be deployed in same region physically, also can be dispersed in different regions.By disposing on user terminal, user terminal can be registered to the SP of appointment nearby.But because Media Stream decides by SP by which MP agency, like this MP of SP distribution often may with user terminal not in same region, cause the situation of user terminal cross-region and MP communication.Referring to shown in Figure 3, dotted line is represented signaling flow among the figure, and solid line is represented Media Stream.Be located in Pekinese's user terminal 1 and call out the Pekinese's user terminal 3 that exists together, SP may select the MP2 that is located in Shanghai to carry out the media message processing when distributing MP.In this case, the Media Stream of user terminal 1 and user terminal 3 Shanghai of need detouring to, this will cause and produce unnecessary flow in the backbone network, cause the bandwidth waste of backbone network.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of system of selection of Media proxy, makes SP for user terminal selecting MP the time, fully takes into account factors such as region, makes the distribution of MP more reasonable, improves the utilance of backbone bandwidth resource.

The present invention proposes a kind of system of selection of Media proxy based on above-mentioned purpose, comprising:

A) after Xin Lingdaili receives the call signaling message that user terminal sends, from the call signaling message, obtain the address information of caller and called user terminal, by inquiring about the corresponding relation of set terminal address information and terminal self geographical position, obtain the geographical location information of caller and called users terminal;

B) by inquiring about the set Media proxy and the corresponding relation of Media proxy self geographical position, obtain the geographical location information of each Media proxy that is used with this Xin Lingdaili;

C) according to step a and b gained result, compare the geographical position of caller and called users terminal and each Media proxy respectively, the nearest Media proxy of chosen distance caller and called users terminal is carried out the Media Stream proxy task of current calling.

This method is given per two geographical position with the distance weights further according to the distance between the two geographical positions, and is far and near corresponding apart from the distance between two geographical position of size and this of weights;

The selection course of the described Media proxy of step c is: respectively to each Media proxy calculate between this Media proxy and the current caller and called users terminal apart from weights and, select gained to carry out the Media Stream proxy task of current calling apart from weights and minimum Media proxy.

This method further comprises: Xin Lingdaili obtains the state information of each Media proxy that is used with it, and preserves;

Comprise to take a step forward at described selection Media proxy: according to the Media proxy state information of preserving, judge whether this Media proxy is available,, then when carrying out the Media proxy selection, this Media proxy is not considered if be unavailable.

This method further comprises: Xin Lingdaili obtains the loading condition of each Media proxy that is used with it, and preserves;

The selection course of the described Media proxy of step c further comprises: if the described Media proxy nearest apart from the caller and called users terminal has two or more, then obtain the current load of these Media proxy, select a minimum Media proxy of load to carry out the Media Stream proxy task of current calling.

Xin Lingdaili obtains the loading condition of each Media proxy that is used with it, and preserves;

The selection course of the described Media proxy of step c is: respectively to each Media proxy calculate between this Media proxy and the current caller and called users terminal apart from weights and, again with gained apart from weights and with the load addition of this Media proxy, select gained as a result the Media proxy of minimum carry out the Media Stream proxy task of current calling.

This method further is provided with user's weights for each Media proxy according to the actual requirements;

The selection course of the described Media proxy of step c is: respectively to each Media proxy calculate between this Media proxy and the current caller and called users terminal apart from weights and, again with gained apart from weights and with the load factor addition of this Media proxy, the gained result multiply by user's weights of this Media proxy again, and the Media proxy of selection gained product minimum is carried out the Media Stream proxy task of current calling.

The described user terminal address information of this method is the domain name of this user terminal in IP network.

This method further comprises: Xin Lingdaili upgrades by the mutual corresponding relation to described terminal address information and terminal self geographical position with user terminal.

From above as can be seen, the system of selection of a kind of Media proxy provided by the invention, by the MP selection strategy is set on SP, finish the Media Stream agent functionality according to the suitable Media proxy of the actual geographical choice of location of user terminal, avoid bandwidth waste unnecessary in the backbone network, saved network bandwidth resources; Effectively reduce the mutual transmission range of each Media Stream in the network, make offered load balanced more, reduced the probability that makes a mistake in the media flow transmission process, improved the network fault tolerance performance.

Description of drawings

Fig. 1 is the networking structure schematic diagram of SBC in the NGN network;

Fig. 2 is the networking structure schematic diagram of distributed SBC in the NGN network;

Fig. 3 moves towards schematic diagram for not optimised signaling flow, the Media Stream of prior art;

Fig. 4 always schemes for the information interaction of distributed SBC in the NGN network;

Fig. 5 selects the schematic flow sheet of MP for the SP in the preferred embodiment of the present invention;

Fig. 6 distributes signaling flow, Media Stream behind the MP to move towards schematic diagram for adopting the present invention program.

Embodiment

On SBC equipment, to be embodied as example the present invention program is described below, but should find out, the present invention is not limited to special-purpose SBC equipment, also can possess and realize this scheme on the equipment of Xin Lingdaili and Media proxy function, for example: equipment such as BAS Broadband Access Server, VPN(Virtual Private Network) gateway, media gateway, enterprise's IP phone gateway at other.

Schematic diagram referring to the information interactive process of distributed SBC shown in Figure 4 in the NGN network.

Step 401 according to existing standard, when MP powers on, is at first set up a reliable communication port and is used for exchange message between SP and MP.The process of setting up of this passage comprises: when MP powers on, initiatively initiated to set up by MP, send the foundation request of communication port to SP; After SP receives the foundation request of MP, can verify that after checking was passed through, passage was set up to the identity of MP; After this, guarantee the availability of passage between MP and the SP by heartbeat message.

Step 402 after the NGN user terminal powers on, needs at first will finish registration process.Specifically comprise: user terminal 1 send include self address logon message to SP, SP is transmitted to the core soft switchcall server with this logon message after handling through register command; The core soft switchcall server sends the registration response to SP, and SP receives the registration reply message from the core soft switchcall server, is transmitted to user terminal 1 again after handling through register command.Equally, the core soft switchcall server also will pass through the registration process identical with user terminal when initially powering on.

Step 403, when needs were set up session, NGN user terminal 1 sent the call signaling message to SP, and SP is transmitted to the core soft switchcall server after handling through call signaling again; The core soft switchcall server can be issued SP earlier with call message with from the call signaling of called user terminal 2, SP carries out being transmitted to user terminal 1 after the call signaling process to call message, simultaneously, SP is transmitted to user terminal 1 after the call signaling of called user terminal 2 is handled.

In carrying out the mutual process of call signaling, can experience the reciprocal process 403 ' of Session Description Protocol (SDP, SessionDescription Protocol).In this process, SP will obtain the address of mutual two parties terminal from the call signaling message, and the address that the MP that is distributed is revised as in the address of both sides opposite end.When a SP and a plurality of MP were used, the allocation strategy that SP can be disposed according to the present invention was selected a MP, and with the MP address that mutual both sides' user terminal is revised as selection, makes this MP finish the proxy task of Media Stream.

Wherein, the present invention needs to consider the following aspects when formulating the allocation strategy of MP:

1) information such as the address location of each MP that is used with SP, disposal ability.Here, SP can utilize the communication port of setting up between MP and the SP, and communication module separately, obtains the information with each MP.In addition, the also required MP information of static configuration on SP in advance.

2) optional, it is also conceivable that the current loading condition that is mated each MP of use that SP oneself preserves.Because the process of setting up of each session all will be passed through SP earlier, so SP can be known loading condition and the preservation of current each MP.

3) optional, it is also conceivable that the available situation that each MP is current.SP can by and MP between communication port know in real time that each MP that is mated use is current and whether break down, thereby judge whether it available.

4) optional, can also on SP each MP configure weights by the user on manager or the network, when distributing MP, preoption heavily is worth low MP.

The MP distribution method of preferred embodiment of the present invention comprises following content:

At first, in SP, set up and safeguard between two geographical position apart from weight table, listing needs the geographical position that may relate to through all business that this SP handles, and between any two apart from weights.Be convenient geographical location management, represent each geographical position with numbering described in apart from weight table, for example: Beijing=1, Shanghai=2, Shenzhen=3 etc.What ginseng was shown in Table 1 gives an example.

Geographical position 1	Geographical position 2	Apart from weights
Geographical position 1	Geographical position 2	Apart from weights	1	1	0
2	2	0	1	1	0
2	2	0	3	3	0

1	2	10
1	2	10	1	3	20
2	3	10	1	3	20
2	3	10	……	……	……

Table 1

As can be seen from Table 1, cost far away more apart from distance between the big more correspondence two geographical positions of weights, transmission is high more.The content of table 1 can upgrading by SP and user terminal alternately.

For determining the geographical position of each user terminal that SP acts on behalf of, in SP, also need set up and safeguard the table of comparisons in user terminal address information and geographical position.With the Session Initiation Protocol is example, and the address information of user terminal is the domain name of user terminal in IP network, and for convenient configuration, can use asterisk wildcard in the table of comparisons, and user terminal domain name of being set up and geographical position table of comparisons ginseng are shown in Table 2.

Domain name	The geographical position
Domain name	The geographical position	01082882789@100.100.20.10	1
01082882484@100.100.20.10	1	01082882789@100.100.20.10	1
01082882484@100.100.20.10	1	075562960169@100.100.20.10	3
021*@100.100.20.10	2	075562960169@100.100.20.10	3
021*@100.100.20.10	2	……	……

Table 2

According to table 2, SP just can obtain the geographical position of this user terminal by the inquiry table of comparisons as long as obtain the domain name of user terminal, and for example: domain name is that the geographical position of the user terminal correspondence of 01082882789@100.100.20.10 is 1 Beijing.

In addition, also in SP, set up and safeguard a MP information table.At least preserve each MP that is used with this SP and the corresponding relation of self geographical position in the MP information table; Other useful information that can also further preserve in addition with each MP comprises: disposal ability, current agency's session number, upstate, user's weights etc.Wherein, adopt maximum number of sessions that MP can support as disposal ability; User's weights are decimals of one from 0 to 1 that network manager or user dispose according to demand, divide timing preoption value little.Concrete ginseng is shown in Table 3.

The MP address	The geographical position	Disposal ability	The current sessions number	State	User's weights
The MP address	The geographical position	Disposal ability	The current sessions number	State	User's weights	100.100.20.1	1	100	20	OK	1
100.100.20.2	1	100	10	OK	1	100.100.20.1	1	100	20	OK	1
100.100.20.2	1	100	10	OK	1	202.96.71.1	2	100	20	OK	1
202.97.46.1	3	100	10	OK	1	202.96.71.1	2	100	20	OK	1
202.97.46.1	3	100	10	OK	1	……	……	……	……	……	……

Table 3

Include in the table 3: the list items such as each MP address, geographical position, disposal ability, current sessions number, state and user's weights that SP is used, the content of list item can be upgraded by the information channel between SP and the MP.

Calling out another sip user terminal 01082882484@100.100.20.10 with the user terminal 01082882789@100.100.20.10 that adopts Session Initiation Protocol below is that example illustrates that SP selects the process of MP, referring to shown in Figure 5:

Step 501～502, after SP received the call signaling message that user terminal sends, searching the corresponding geographical position of this user terminal according to the domain name 01082882789@100.100.20.10 of this user terminal in terminal domain name and the geographical position table of comparisons (table 2) was 1.

Step 503, SP is according to the called user terminal domain name 01082882484@100.100.20.10 that comprises in the current call signaling message, and searching the corresponding geographical position of this called user terminal in terminal domain name and the geographical position table of comparisons (table 2) is 1.

Step 504～505, SP obtains the address of each MP by MP information table (table 3); Geographical position 1,1 according to preceding two caller and called users terminals that step obtained, by inquiry between the geographical position apart from weight table (table 1), obtain the caller and called users terminal separately and between each MP apart from weights, again with two between same MP and the caller and called users terminal apart from the weights addition, obtain this MP and current caller and called users terminal apart from weights and.

For example: obtaining the address by question blank 3 is that the geographical position of the MP of 202.96.71.1 is 2, then this geographical position 2 being inquired in table 1 as index with the geographical position 1 of call subscriber terminal between them is 10 apart from weights, it between them also is 10 apart from weights that this geographical position 2 inquires in table 1 as index with the geographical position 1 of called user terminal, two weights additions that will obtain again, obtain this MP and current caller and called users terminal apart from weights and be 20.So, calculate between each MP and the current caller and called users terminal apart from weights and, the result that obtains ginseng is shown in Table 4.

The MP address	With caller apart from weights	With called apart from weights	MP apart from weights and
The MP address	With caller apart from weights	With called apart from weights	MP apart from weights and	100.100.20.1	0	0	0
100.100.20.2	0	0	0	100.100.20.1	0	0	0
100.100.20.2	0	0	0	202.96.71.1	10	10	20
202.97.46.1	20	20	40	202.96.71.1	10	10	20

Table 4

At this moment, just can from the result of table 4, select, carry out the Media Stream agent functionality apart from weights and minimum MP.But, two MP are arranged as can be seen, i.e. 100.100.20.1 and 100.100.20.2, they apart from weights with identical, like this,, can consider the out of Memory of MP for selecting best MP, carry out the scheme of following step 506～507.

Step 506～507, by inquiry MP information table, the state of obtaining is the information that comprises disposal ability, current sessions number and user's weights etc. of each MP of OK, calculate the comprehensive weights of these MP, the comprehensive weights of MP=[MP apart from weights and+(100 * MP current sessions number/MP disposal ability)] * user's weights." MP current sessions number/MP disposal ability " is equivalent to the present load rate of MP as can be seen from this formula, multiply by 100 again and promptly obtains the current load of this MP.The result of calculation of the current comprehensive weights of each MP is as shown in table 5.

The MP address	The comprehensive weights of MP=[MP apart from weights and+(100 * MP current sessions number/MP disposal ability)] * user's weights
The MP address		100.100.20.1	[0+(100×20/100)]×1＝20
100.100.20.2	[0+(100×10/100)]×1＝10	100.100.20.1	[0+(100×20/100)]×1＝20
100.100.20.2	[0+(100×10/100)]×1＝10	202.96.71.1	[20+(100×20/100)]×1＝40
202.97.46.1	[40+(100×10/100)]×1＝50	202.96.71.1	[20+(100×20/100)]×1＝40

Table 5

By listed result in the comparison sheet 5, just can select the MP of comprehensive weights minimum, promptly the address is that the MP of 100.100.20.2 finishes current Media Stream proxy task.This MP address is sent to call subscriber terminal as the destination address of caller Media Stream, and this MP address is sent to called user terminal as the destination address of called Media Stream.Need to prove, also user's weights can be set here, then the comprehensive weights=MP of MP apart from weights and+(100 * MP current sessions number/MP disposal ability).

In addition, can also there be other implementation step 506～507, such as the result of calculation that adopts following steps: SP by table 4, select apart from weights and minimum MP, as MP to be selected; Judge the upstate of these MP to be selected, the state of selecting is the MP of available (being OK), compares their current loading condition " 100 * MP current sessions number/MP disposal ability ", and the MP that therefrom selects the load minimum carries out current Media Stream agent functionality.

Step 404, behind the access success, SP by and MP between the communication port notice MP that sets up set up the media session table, the content of media session table comprises: { source IP address port (old), purpose IP address port (old), source IP address port (newly), purpose IP address port (newly) }, wherein " source IP address port (old) " and " purpose IP address port (old) " is respectively source IP address port and the purpose IP address and the port of the media stream message that receives of MP; " source IP address port (newly) " and " purpose IP address port (newly) " is respectively that media stream message carries out source IP address and port and the purpose IP address and the port that will become after the media agent handle by MP.Because SP will lead, the address that called user terminal opposite end user terminal address separately is revised as the MP that is distributed, therefore main, called user terminal can send to MP with media stream message, MP is according to the source IP address port and the purpose IP address port of media stream message, by with the media session table in { the source IP address port (old) preserved, purpose IP address port (old) } these two list item couplings, inquire pairing { source IP address port (newly), purpose IP address port (newly) }, and with the source IP address port in the media stream message and purpose IP address port with { the source IP address port (newly) in the media session table, purpose IP address port (newly) } replace, thereby finish the media session agent functionality, the media stream message behind the agency is sent to the purpose user terminal.

After one of them user terminal talk-through on-hook, SP will receive the call signaling of taking out stitches of user terminal, and SP is transmitted to the core soft switchcall server after this signaling is handled through call signaling again; Core soft switchcall server notice is taken out stitches to end subscriber, and sends response signaling to SP, and SP is transmitted to the described user terminal that sends the call signaling of taking out stitches after handling through call signaling again; Simultaneously, SP by with MP between the MP of the communication port notification agent current talking set up delete the corresponding media session table of this calling.

In addition, under the situation that has a plurality of SP simultaneously, can backup each other between a plurality of SP; When a SP lost efficacy, another SP can take over the work of inefficacy SP, finishes the function of Xin Lingdaili; But the calling that former cause inefficacy SP sets up can be interrupted, and being controlled at the last media session table of creating of MP by this SP also needs synchronous deletion.Simultaneously, the disposal ability of this MP is released, and reintegrates in the MP selection strategy of the SP that comes into force.

Adopt signaling flow, Media Stream trend after the present invention program distributes MP, referring to shown in Figure 6, dotted line is represented signaling flow among the figure, and solid line is represented Media Stream.Be located in 1 calling of Pekinese's user terminal as can be seen and be located in Pekinese's user terminal 3 equally, SP carries out the processing of media message according to policy selection MP1 of the present invention; In this case, user terminal 1 is limited in the metropolitan area network of Beijing with the Media Stream of user terminal 3, thereby has avoided bandwidth waste unnecessary in the backbone network, has reduced the media flow transmission distance.

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

Claims

1, a kind of system of selection of Media proxy is characterized in that, comprising:

2, method according to claim 1 is characterized in that, according to the distance between the two geographical positions, gives per two geographical position with the distance weights, and is far and near corresponding apart from the distance between two geographical position of size and this of weights;

3, method according to claim 1 is characterized in that, Xin Lingdaili obtains the state information of each Media proxy that is used with it, and preserves;

4, according to claim 1 or 2 or 3 described methods, it is characterized in that Xin Lingdaili obtains the loading condition of each Media proxy that is used with it, and preserve;

5, method according to claim 1 is characterized in that, according to the distance between the two geographical positions, gives per two geographical position with the distance weights, and is far and near corresponding apart from the distance between two geographical position of size and this of weights;

6, method according to claim 5 is characterized in that, further for each Media proxy user's weights is set according to the actual requirements;

7, method according to claim 1 is characterized in that, described user terminal address information is the domain name of this user terminal in IP network.

8, method according to claim 1 is characterized in that, this method further comprises: Xin Lingdaili upgrades by the mutual corresponding relation to described terminal address information and terminal self geographical position with user terminal.