CN100486234C - A method used by signalling gateway to manage the routing state of IP field signalling point - Google Patents

Abstract

The invention relates to a method for managing the route state of IP domain signal in signal network gate. Wherein, it uses M3ua at signal network gate to provide IP domain signal state maintenance to exchange domain; via setting default route and secondary route when diverting message, shielding the effect of inconsistent service route states at one code of IP domain. The invention can realize the maintenance on the junction state of software exchanger.

Description

A kind of SGW is to the method for IP domain signaling point routing state management

Technical field

The present invention relates to the interoperability methods of a kind of traditional signaling message network and IP signaling network, in particular a kind of SGW is applicable to next generation network NGN technical field to the method for IP domain signaling point routing state management.

Background technology

At present, Softswitch technology is the direction of network evolution that industry is generally acknowledged, this system makes that by the IP group technology PSTN net, data network and the mobile network of networking were able to real fusion respectively originally, the user who inserts by various terminals can enjoy unified business, meets the trend of network evolution and user's request development.In the process of construction of next generation network, a problem that must face be exactly will with seamless the interconnecting of existing disparate networks.

SGW SG (Signalling Gateway) is the Xin Lingdaili that the edge of No.7 signaling network and IP network received and sent signaling message, signaling message is carried out relaying, translation or finalization process, its essence is exactly in order to realize the No.7 signalling interworking between PSTN end office (EO) and the Softswitch, to realize the translation function of signaling bear layer circuit switching and IP grouping.The networking of SGW equipment is used and mainly is divided into the networking application that signalling point is acted on behalf of, and comprises circuit is relevant and circuit is irrelevant signaling application and Signalling Transfer Point networking application.Under the signal switching point mode, SGW equipment has oneself independently signaling point code, and complete Signalling Transfer Point function is provided.

M3UA (MTP3-User Adapter) is a kind of adapting protocol that transmits the No.7 signaling message in IP network, and M3UA uses the primitive identical with MTP3.Application server AS is the logic entity of the specific routing key of service, for example application server is the virtual switch unit, it handles the calling procedure of all PSTN relayings of being discerned by signalling system No.7 destination code DPC/ Original Point Code OPC/ cic circuit identification code CIC_ scope, another kind of example is the virtual data library unit, and it handles the transaction that specific NO.7 signaling destination code DPC/ Original Point Code OPC/SCCP Sub-System Number SSN combination is discerned.Application server process ASP is the process instance of application server.Routing key is described one group of NO.7 signaling parameter and parameter value, and it has defined the signaling traffic of being handled by specific application servers uniquely.For the message that No. 7 territories are transmitted, M3ua navigates to the route of an application server AS service by routing key, when not matching an available application server AS by routing key, can send on the route of acquiescence.

When SGW is operated in transit point mode following time, may there be a plurality of application server process ASP in SGW to Softswitch, the different different AS of ASP service, corresponding different business, business can be passed through DPC+, and (various combinations CIC) are located for OPC, SI.Because the state of different AS is also inconsistent, so business to same IP domain signaling point, routing state is inconsistent, and to obtain these service conditions be routing management message by the Mtp3 (transfer source layer 3) of SGW broadcasting in the exchange city, these message are not distinguish the different routing states of same destination code different business, so can occur when SGW exists available and disabled routing state simultaneously to the business in IP territory, how notifying switching domain still not have a kind of reliable solution in the prior art to the state of IP domain signaling point.

After the signalling point to of a switching domain Signalling Transfer Point STP office direction can reach, can send message to relevant signalling point by STP; If STP is to the relevant inaccessible words of signalling point, can forbid transmitting TFP message to the Original Signaling Point transmission after receiving message, M3ua on the SGW is as an adaptation layer, receive the message of switching domain signalling point to IP domain signaling point, if can not send to IP domain signaling point, should send TFP message to Original Signaling Point.Such processing does not realize in agreement, because SGW is to same IP domain signaling point different business routing state difference, if there is the routing state of available and unavailable business simultaneously, directly send TFP message and may make available professional this moment also unavailable, therefore still do not solve at present the technical scheme of this situation.

Summary of the invention

The purpose of this invention is to provide the method for a kind of SGW to the management of IP domain signaling point routing state, on SGW, provide IP domain signaling point route reliable and correct state-maintenance to switching domain by M3ua, when configuration of secondary service route by acquiescence and message routing second grade highway by realization, shielding M3ua bring to the inconsistent influence of IP territory same point coding different business routing state.

Technical scheme of the present invention comprises:

A kind of SGW is to the method for IP domain signaling point routing state management, in switching domain, one first signalling point and the 3rd signalling point are by the switching of second signalling point, described second signalling point is a Signalling Transfer Point, in the time of in the 3rd signalling point is in the IP territory, described second signalling point becomes SGW, described SGW provides the notice of original the 3rd signalling point at the identical routing state of switching domain to first signalling point of switching domain, described method provides IP domain signaling point routing state accurate maintenance process, and it comprises that step is as follows:

A: different keyword location is set on SGW, the different business of same IP domain signaling point is navigated to respectively on the service route of different application server;

B: on the basis of described service route, described SGW is respectively the secondary service route that different IP domain signaling point provides a different default application server, when the secondary service route that uses the acquiescence of this signalling point to the service route of a certain signalling point in IP territory disabled the time; The office direction state of described IP domain signaling point only passes through to this specific route of the secondary service route of acquiescence of this signalling point and safeguards.

Described method wherein, also comprises:

C: when receiving that switching domain mails to the message of a certain signalling point in IP territory, and described SGW is to the service route of this IP domain signaling point and the secondary service route of acquiescence when all unavailable, and described SGW is forbidden pass-along message to the Original Signaling Point transmission.

A kind of SGW provided by the present invention is to the method for IP domain signaling point routing state management, since when adopting the configuration of the secondary service route by acquiescence and message routing second grade highway by realization, shielded that M3ua brings to IP territory same point coding different business routing state inconsistent influence, realized the right-on maintenance of SGW, had great significance for the seamless transmission in switching domain and IP territory to Softswitch office direction state.

Description of drawings

Fig. 1 is the protocol stack schematic diagram that the SGW of the inventive method is realized IP territory and switching domain intercommunication;

Fig. 2 is there is different business in the SGW of the inventive method to the same signalling point in IP territory a schematic diagram;

Fig. 3 is the schematic diagram that the SGW of the inventive method is safeguarded the routing state of the signalling point X of arriving shown in Figure 2.

Embodiment

Below in conjunction with accompanying drawing, will the concrete preferred embodiment of the method for the invention be described further.

A kind of SGW of the present invention is to the method for IP domain signaling point routing state management, as depicted in figs. 1 and 2, for the signalling point of switching domain,, be a Signalling Transfer Point at the second signalling point B if the first signalling point A and the 3rd signalling point C transfer by the second signalling point B.The second signalling point B safeguards that to the first signalling point A routing state of the 3rd signalling point C is divided into some following dispositions, supposes that wherein link is available between the second signalling point B and the first signalling point A:

1. after the link establishment success of the second signalling point B to the, three signalling point C, the second signalling point B can send TFA (allowing to transmit) message about the 3rd signalling point C to the first signalling point A, and the first signalling point A receives that the route of then thinking after this message by the second signalling point B to the, three signalling point C becomes available.

When the chain route of the second signalling point B to the, three signalling point C can with become unavailable after, the second signalling point B can send TFP (forbidding transmitting) message about the 3rd signalling point C to the first signalling point A, and the first signalling point A receives that this message thinks that later on the route by the second signalling point B to the, three signalling point C becomes unavailable.

3. the first signalling point A sends to the message of the 3rd signalling point C to the second signalling point B, if the link between the second signalling point B to the, the three signalling point C is unavailable at this moment, the second signalling point B receives after the message that the first signalling point A sends and can send TFP message about the 3rd signalling point C to the first signalling point A, thinks after the first signalling point A receives that the route by the second signalling point B to the, three signalling point C becomes unavailable.

Present the 3rd signalling point C has changed to the IP territory, and the second signalling point B becomes SGW.SGW B will realize the intercommunication between No.7 nation-wide Network and the IP Packet Based Network, must provide original the 3rd signalling point C notice at the identical routing state of switching domain to the switching domain first signalling point A.It is as follows to the invention provides the accurate step of safeguarding of IP domain signaling point routing state:

1. different keyword location is set on SGW, the different business of same IP domain signaling point is navigated to respectively on the service route of different AS servers, these service routes are as the normal route of message; Normal route is only used in the time of the message routing, does not influence the maintenance of SGW to IP domain signaling dotted state.

2. SGW is respectively different IP domain signaling point different secondary service routes that acquiescence AS serves is provided on the basis of normal route.When the secondary service route that uses the acquiescence of this signalling point to the normal route of a certain signalling point in IP territory disabled the time.The office direction state of IP domain signaling point only passes through to this specific route of secondary service route of the acquiescence of this signalling point and safeguards.

When receiving that the PSTN switching domain mails to the message of a certain signalling point in IP territory, and SGW is to the normal route of this IP domain signaling point and the secondary service route of acquiescence when all unavailable, and SGW is to Original Signaling Point transmission TFP message.The secondary service route of above-mentioned acquiescence, the normal route of its priority ratio is low, only just uses the service route of this acquiescence when normal service route is disabled.

The protocol stack schematic diagram that the inventive method relates to as shown in Figure 1.On the SGW the adaptive of IP layer finished by M3ua.SP is the switching domain signalling point, and SG is a SGW, and IPSP is the signalling point in IP territory.Fig. 2 is the application of a kind of typical networking of the inventive method SGW.SG is operated in the signalling point substitute mode, signaling point code Z, and SG links to each other with IPSP by two ASP.ASP1 is included among the AS1, and ASP2 is included among the AS2.AS1 and AS2 share signaling point code X, but two AS handle the contextual business of different routings, and the routing context is based on DPC+ (OPC, CIC, various combinations SI).Signaling SP1 and SP2 point coding are respectively Y1 and Y2, are the signalling points in No. 7 territories, and SP1 and SP2 exist professional 1 and professional 2 by SG to X simultaneously.

Be the schematic diagram that SGW of the present invention is safeguarded IP domain signaling dotted state as shown in Figure 3.The secondary service route that is configured to the acquiescence of IP domain signaling point X comprises that all arrive the ASP of X, establishes example here and is ASP1 and ASP2.The secondary service route of acquiescence when ASP1 or ASP2 have 1 available the time just for available, have only when ASP1 and ASP2 are all unavailable just become later unavailable.SGW is only safeguarded the state of IP domain signaling point X to switching domain by the state of secondary service route of acquiescence.The normal route that AS1 and AS2 safeguard participates in the routing of message, but does not participate in the maintenance of IP domain signaling point routing state.Its detailed process comprises:

Initial condition is shown in step 301, and ASP1 and ASP2 are disabled, and the normal route that AS1 and AS2 safeguard and the secondary service route of acquiescence are all unavailable.After SG can use to the link of a signalling point SP of switching domain, the message that SP may send about professional 1 or 2 arrived SGW, and at this time SGW is to the TFP message of Original Signaling Point transmission about X.

Under the state of step 302, ASP1 has entered activated state, the ASP2 un-activation, then the normal route of the business 1 safeguarded of AS1 can with and the normal route of the business 2 that AS2 safeguards is unavailable.Simultaneously because the ASP1 in the secondary service route of acquiescence can use, SGW is to the signalling point broadcasting of the switching domain TFA message about IP domain signaling point X.If at this moment received the business 1 that switching domain sends, then the route of directly safeguarding at AS1 is to send on the ASP1; If receive professionally 2 the time, business is sent to IP domain signaling point by the ASP1 in the secondary service route of acquiescence.

Under the state of step 303, ASP2 also becomes available, and the normal route that AS2 safeguards becomes available, at this moment owing to the office direction to IP domain signaling point is available, no longer broadcasts TFA message informing switching domain, and the ASP2 of business 2 on the normal route that AS2 safeguards sends.

Under the state of step 304, ASP1 becomes unavailable, the normal route that AS1 safeguards is no longer available, and the normal route that AS2 safeguards and the secondary service route of acquiescence still are upstate, business 1 sends by the ASP2 in the secondary service route of acquiescence, and business 2 sends by the ASP2 in the normal route of AS2 maintenance.

After ASP1 and ASP2 were all unavailable, the secondary service routing state of acquiescence was become unavailable by upstate at step 305 state, and at this time SGW is to the TFP message of switching domain broadcasting about IP domain signaling point.

Said method of the present invention by acquiescence the configuration of secondary service route and during the message routing second grade highway by realization, shielded that M3ua brings to IP territory same point coding different business routing state inconsistent influence, switching domain only from routing management message such as TFA and TFP be can not discern this inconsistent.The present invention has realized the right-on maintenance of SGW to Softswitch office direction state, has great significance for the seamless transmission in switching domain and IP territory.

Should be understood that above-mentioned description at the specific embodiment of the invention is comparatively concrete, can not therefore be interpreted as the restriction to scope of patent protection of the present invention, scope of patent protection of the present invention should be as the criterion with claims.

Claims (2)

1, a kind of SGW is to the method for IP domain signaling point routing state management, in switching domain, one first signalling point and the 3rd signalling point are by the switching of second signalling point, described second signalling point is a Signalling Transfer Point, in the time of in the 3rd signalling point is in the IP territory, described second signalling point becomes SGW, described SGW provides the notice of original the 3rd signalling point at the identical routing state of switching domain to first signalling point of switching domain, described method provides IP domain signaling point routing state accurate maintenance process, and it comprises that step is as follows:

A: different keyword location is set on described SGW, the different business of same IP domain signaling point is navigated to respectively on the service route of different application server;

B: on the basis of described service route, described SGW is respectively the secondary service route that different IP domain signaling point provides a different default application server, when the secondary service route that uses the acquiescence of this signalling point to the service route of a certain signalling point in IP territory disabled the time; The office direction state of described IP domain signaling point only passes through to this specific route of the secondary service route of acquiescence of this signalling point and safeguards.

2, method according to claim 1 is characterized in that, described method also comprises:

C: when receiving that switching domain mails to the message of a certain signalling point in IP territory, and described SGW is to the service route of this IP domain signaling point and the secondary service route of acquiescence when all unavailable, and described SGW is forbidden pass-along message to the Original Signaling Point transmission.

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