CN100499472C

CN100499472C - Network architecture for carrying number based on distributed DNS system in IMS network and its method

Info

Publication number: CN100499472C
Application number: CNB2006101143879A
Authority: CN
Inventors: 汪军
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2006-11-08
Filing date: 2006-11-08
Publication date: 2009-06-10
Anticipated expiration: 2026-11-08
Also published as: CN101102205A

Abstract

The network architecture comprises: a number management domain, a number current domain and a number settling-in domain. Each of the number management domain, number current domain and number settling-in domain respectively comprises: an IMS calling processing net element comprising CSCF, BGCF, MGCF, IBCF or the IMS network calling processing node that will be defined by standardization organization; a number carrying database with DNS access interface used for storing the data of users in the domain and the emigration domain check list of user emigrating to other domain; an IMS home subscription user server used for saving the active number resource of the domain where it is located at.

Description

Realize network configuration and the method that number carries based on the distributed DNS system in the IMS net

Technical field

The present invention relates to number and carry, particularly relate in a kind of IMS net and realize network configuration and the method that number carries based on the distributed DNS system.

Background technology

The IMS full name is IP Multimedia Subsystem, it is IP Multimedia System, it is a kind of multimedia communication network that adopts Session Initiation Protocol as call control signalling of 3GPP definition, adopted at present, as the core net of future generation of mobile fixed network fusion by standards bodies such as 3GPP2, TISPAN.

It is that a kind of telecommunication user is migrated in different geographic areas or changeed net and needn't change the technology of own number between different operators that number carries.It is not only telecom supervision authority as a kind of technology and breaks up monopoly, reduces a kind of supervision requirement of competition threshold to operator, also is that operator is a kind of business that self competitiveness of raising is adopted.

The general E.164 Customs Assigned Number mode that adopts ITU-T (standardization body of International Telecommunications Union) definition in the legacy network, do not implementing before number carries, E.164 itself just possesses the ability of carrying out route in network numbering, and implement after number carries, because the prefix of number and concrete zone no longer include corresponding relation, therefore need to obtain extra routing iinformation so that the correct route of in network, carrying out, the general number portability database of concentrating that adopts is stored user's routing iinformation that migration takes place, and adopts the framework of intelligent network to solve the routing issue that number carries.

Customs Assigned Number adopts SIP URI form in the IMS network, be form with " user name @ domain name ", adopt HSS (Home Subscriber Server, home signature user server) comes storing user subscription data, adopt the mode in territory to organize user data among the IMS, a territory is exactly user's a addressing space, is not implementing under the situation that number carries, the operational area of territory and operator has corresponding relation closely, and domain name has just been carried the information of carrying out route in the IMS network.The scheme that the still undefined so far IMS network number of normal structure carries, theoretically, its number carries and also can adopt the application server that is similar to the traditional intelligence net or adopt the database solution of concentrating, but it generally needs to increase new access interface, also is difficult to accomplish the number portability of the whole network.

Summary of the invention

Technical problem to be solved by this invention is, provide in a kind of IMS net and realize network configuration and the method that number carries based on the distributed DNS system, under the situation that does not influence existing implementation criteria, realize that the number in the IMS network carries, its adaptation, expansion and manageability are good.

To achieve these goals, the invention provides in a kind of IMS net and realize the network configuration that number carries based on the distributed DNS system, comprise: number administration territory, number the current field and the number territory of moving into, described number administration territory, number the current field and the number territory of moving into all comprises again:

IMS call treatment network element comprises the IMS calling network processing node that CSCF, BGCF, MGCF, IBCF or normal structure define in the future;

Adopt the number portability database of DNS access interface, the territory table of comparisons of moving out that is used for only depositing the active user data in its territory, place and is carried into the user in other territories from territory, described place;

The IMS home signature user server is used to deposit the movable number resource in its territory, place.

The number portability database of described employing DNS access interface comprises dns server and the number portability database of independently setting up, and described dns server is by standard agreement or the described number portability database of proprietary protocol interface accessing.

Described network configuration, Subscriber Number adopt SIP URI form, TEL URI form or number E.164.

Described network configuration, the number portability database of the employing DNS access interface of number the current field of calling subscriber is used for the number administration territory of the described keyword correspondence of keyword query of the query requests initiated according to the IMS call treatment network element of number the current field of calling subscriber.

Described network configuration, the number portability database of the employing DNS access interface in called subscriber's number administration territory, be used for the recursive query request initiated according to the number portability database of the employing DNS access interface of number the current field of calling subscriber, number the current field of inquiry called subscriber.

Described network configuration, the number portability database of the employing DNS access interface of number the current field of calling subscriber is used for the nodal information of Ingress node of the IMS call treatment network element of iterative query called number the current field.

The invention also discloses in a kind of IMS net and realize the method that number carries based on distributed DNS, the network configuration based on above-mentioned comprises:

Step 1, the calling subscriber makes a call to the called subscriber, the IMS call treatment network element of number the current field of calling subscriber is received described calling, and to the number portability database inquiry called subscriber's of the described employing DNS access interface of number the current field of calling subscriber number administration territory, wherein, the described called subscriber successful execution number signatory step of carrying;

Step 2, the number portability database of the employing DNS access interface of described rear subscriber number the current field is initiated number the current field that recursive query obtains the called subscriber to the number portability database of the employing DNS in called subscriber's number administration territory access interface;

Step 3 is inquired about the IMS call treatment network element of called subscriber's ownership in number the current field of determining the called subscriber, and gives the called subscriber by the IMS call treatment network element of described called subscriber's ownership with call forward;

Step 4, called subscriber answer, and response message is forwarded to the calling subscriber, call setup.

The signatory step that described called number carries comprises again:

Described called subscriber files an application to the move into receiving system in territory of number;

Described receiving system is accepted described application and is sent request, makes the number portability database of employing DNS access interface in called subscriber's number administration territory that number the current field of called subscriber is revised as the move into domain name of territory correspondence of described number;

The described called subscriber's of deletion data in the IMS home signature user server of number the current field of called subscriber;

In moving into the IMS home signature user server in territory, called subscriber's number increases described called subscriber's data.

The step that described receiving system is accepted described application also comprises: called subscriber's public subscriber identification is constant, and private user identity changes to the number sign that the territory distributes of moving into.

The step in the called subscriber's of inquiry described in the step 1 number administration territory further comprises:

Step 10, the IMS call treatment network element of described rear subscriber number the current field is initiated the NAPTR inquiry to the number portability database of the employing DNS of rear subscriber number the current field access interface, key word of the inquiry is called subscriber's SIP URI, with inquiry called subscriber's number administration territory.

The query script of step 2 further comprises:

Step 21, the number portability database of the employing DNS access interface of called number management domain is returned one to multiple record to the IMS of rear subscriber number the current field call treatment network element, and identifies by the attribute of the flag field in the NAPTR record to described one to multiple record;

Step 22, if do not comprise the domain name of called number the current field in described one to multiple the record, the IMS call treatment network element of then described rear subscriber number the current field is replaced described called subscriber's SIP URI according to the regexp field in the described record, again initiate the inquiry of NAPTR, until the domain name that obtains called number the current field.

Described step 3 further comprises:

Step 31, the IMS call treatment network element of described rear subscriber number the current field is initiated iterative query to the number portability database of the employing DNS access interface of described rear subscriber number the current field, obtain the nodal information of Ingress node of the IMS call treatment network element of called number the current field, and return the IMS call treatment network element that described nodal information is given described rear subscriber number the current field;

Step 32, the IMS call treatment network element of described rear subscriber number the current field inserts first SIP Route head with the nodal information of described Ingress node, and calling is sent to described Ingress node;

Step 33, described Ingress node with called subscriber's SIP URI as keyword, the described IMS home signature user server of inquiry called number the current field, obtain the IMS call treatment network element of the ownership of called subscriber described in the IMS call treatment network element of called number the current field, and give the called subscriber with call forward by it.

The nodal information of Ingress node described in the step 31 comprises: the host name of described Ingress node and IP address.

The present invention can realize that number carries process, and existing network is changed minimum, possesses good extensibility and manageability again, and its foundational system is full distributed store, and the path of message is shorter, and is less relatively to the time delay that network is introduced.

Description of drawings

Fig. 1 carries schematic network structure for IMS network number of the present invention;

Fig. 2 is for realizing the flow chart that number carries in the IMS network;

Fig. 3 is for implementing the realization flow figure that number carries calling procedure.

Embodiment

Below cooperate embodiment and accompanying drawing, describe technical characterictic of the present invention in detail.

Among the present invention, Subscriber Number can change net and carry out number and carry between the network of the network of different regions or different operators.The territory that the network of this difference region or the network of different operators are promptly corresponding different.And the number that is carried out carries service, and corresponding to each number, the place side that its number carries contract signing relationship all comprises three kinds of roles: number administration territory, number the current field, the number territory of moving into.

Wherein, the number administration territory is meant number original allocation territory, i.e. the territory that is assigned with first of number, and the domain name in this territory is all the time as the domain name part of the Subscriber Number that it distributed, and no matter whether it number takes place is carried.Number the current field is meant territory, the current place of number contract signing relationship.The number purpose territory that the territory is meant that a certain number will be carried at once of moving into, it is an of short duration role, only is present in the process of number portability service contract signing relationship change, in case signatory change successfully then number carries the number territory of moving into also is converted into number the current field.

Carry out the number that number carries for each, all have corresponding number administration territory, number the current field, the number territory of moving into, and above-mentioned different role can be played the part of for different numbers in each territory.Be that each territory can assignment numbers, each territory can be as the number administration territory of a part of number, and the carrying out of carrying along with number changes the realization of net, and each territory all might become the number the current field or the territory of moving into of the number that other territory distributes.

Fig. 1 carries schematic network structure for IMS network number of the present invention.With some numbers is example, and as shown in the figure, 101 is its number administration territory (A territory), and 102 is its number the current field (B territory), and 103 are its number territory (C territory) of moving into.These three territories can be respectively the network that different operators is built, or are in the network of different regions.

Each territory shown in the figure all mainly has three functional nodes:

(1) IMS call treatment network element 106, comprise CSCF (Call Session Control Function, CSCF), BGCF (Breakout Gateway Control Function, Breakout Gateway Control Function), MGCF (Media Gateway Control Function, MGCF), IBCF (Interconnection Border Control Function, interconnection boundary Control function) or the IMS network others call treatment node that defines in the future of normal structure, adopting CSCF106 at this is example, and CSCF (A) promptly represents the CSCF in A territory.This CSCF is an IMS call state Control Node, can finish the basic call in IMS territory.Wherein, this CSCF comprises P-CSCF, S-CSCF, I-CSCF.P-CSCF is a proxy CSCF, is first equipment that the user inserts the IMS system, and I-CSCF is inquiry CSCF, is the boundary node of IMS network interworking, and S-CSCF is a serving CSCF, is the practical business control point of user IMS business.

Wherein, P-CSCF carries out Signalling exchange as subscriber equipment (UE) first contact point on IMS with UE, and described signaling is carried out being transmitted to I-CSCF or S-CSCF after the respective handling; I-CSCF mainly is responsible for network security; S-CSCF then is the core business controlled entity of IMS, preserves user signing contract information, recording user call state and calls out control.

(2) DNS-NPDB (NPDB, Number Portability Database), the number portability database 104 of employing DNS access interface is finished basic DNS query function, deposits the information in whole territories, the current place of user in the territory of living in.That is, comprise the active user data (comprising the user who is carried into this territory from its territory) in this territory and be carried into the user's in its territory the territory table of comparisons of moving out from this territory number.And this distributed DNS is an organic component of IMS DNS system, it supports recursive query mode and NAPTR (the NamingAuthority Pointer of DNS, order authoritative pointer) record queries, support DDDS (Dynamic DelegationDiscovery System, dynamic proxy is found system) algorithm, dispose from physics, can integrate between DNS Server and the NPDB, also can separately dispose, the interface between the former with the latter can be a kind of standard agreement (as MAP, Diameter, LDAP etc.) or proprietary protocol interface at this moment.This DNSServer also can be integrated among the DNS-NPDB.

(3) HSS (Home Subscriber Server), IMS home signature user server 105 is mainly deposited current movable number resource in this territory, contracted user's information, does not comprise that number is carried into the user data in its territory.

As shown in the figure, each territory all also comprises other calling control network element 107, comprises types of applications server and gateway node.

See also and Figure 2 shows that Subscriber Number carries the flow chart of signatory process in the IMS network.The number administration territory of supposing user U1 is A, and number the current field is B, and prepares to move to C territory (number move into territory).Signed the number portability service agreement between B, the C, the process of then should contracting is as follows:

U1 handles number portability service to C territory operator, C territory operator accept by receiving system and with U1 sign a contract (step 201), U1 changes the ISIM card, and its number is that PUI (public subscriber identification) is constant, and PVI (private user identity) changes to the sign that the C territory is distributed.Subsequently, number is moved into the territory receiving system to be C territory receiving system is sent number according to the domain name of U1 to its number administration territory (A territory) and carries signatory change request (step 202), and it can adopt standardized access interface, also can be forms such as mail, fax.After the number administration territory is received this number and carried signatory change request, at first its legitimacy is tested,, then revise the user data table of comparisons that this territory NPDB is DNS-NPDB (A), number the current field of U1 is made as C (step 203) if qualified.The number administration territory also sends number to C territory receiving system and carries signatory change response message (step 204), and this Subscriber Number the current field information of notice C territory changes.It can be a standard protocol interface, also can be mail, fax.The domain name (C territory) that comprises number the current field that user U1 preserves in the response message in the number administration territory.After C territory receiving system receives this response message, initiate number to number the current field (B territory) and carry deletion user data requests (step 205), the B territory is after receiving this deleted data request, check request legitimacy, if legal then delete the user data of U1 among the HSS (B), and subtend C territory receiving system sends number and carries deletion user data response message (step 206).After the receiving system in C territory is received this response message, initiate to insert the number territory user data requests of moving into to this territory HSS (C), and with among the user data insertion HSS (C) of U1 (step 207), HSS (C) sends to the receiving system in C territory and inserts the number territory user data response message (step 208) of moving into, arrive this, number portability service changes successfully, and the C territory is converted to number the current field by the number territory of moving into.

U1 moves into behind the C territory, because the routing iinformation (Request-URI) that carries is number the current field, so route carries out route according to normal method for routing and get final product, and do not do any change in registration process.

Following with reference to Fig. 3, promptly implement the realization flow figure that number carries calling procedure.Suppose that calling subscriber U2 makes a call, called is U1.Wherein, U2 is in the M territory, whether does not realize that number carries though calling procedure is not paid close attention to calling subscriber U2, and U2 also has number administration territory, number the current field of correspondence as shown in Figure 1, then the M territory is number the current field of U2, and is identical with the role in B territory among Fig. 1.U1 succeeds in registration in the C territory by above-described number carrying method.

As shown in the figure, IMS user U2 initiates INVITE and calls out, and called is U1 (step 301), and the P-CSCF (M) that calls out in the M territory arrives the S-CSCF (M) that U2 belonged to.S-CSCF (M) initiates the DNS inquiry to the DNS-NPDB in this territory (M), and key word of the inquiry is the SIP URI of U1, and query type is NAPTR (step 302).DNS-NPDB (M) receives inquiry, obtains its number administration territory A according to the suffix domain name of the SIP URI of U1, and initiates recursive query to the DNS-NPDB of number administration territory A (A), obtains domain name---the C (step 303) of U1 number the current field.Subsequently, DNS-NPDB (M) returns the domain name C (step 304) of U1 number the current field to S-CSCF (M).S-CSCF (M) initiates iterative query, DNS-NPDB (M) carries out the process of the location sip server of RFC3263 defined, inquiry obtains the address (step 305) of the entry host I-CSCF (C) (being Ingress node) in C territory, and host name and the IP address of I-CSCF (C) returned to S-CSCF (M).And S-CSCF (M) inserts Top Route (being first SIP Route head) with the host name of I-CSCF (C), inserting a parameter indication simultaneously is that NP (NumberPortabil ity) number carries calling, and calling mail to I-CSCF (C) (step 306), the step of this insertion I-CSCF (C) can avoid the network element in the path to repeat to initiate the NPDB process.I-CSCF (C) receives calling, according to Top Route indication, no longer carries out route according to Request-URI, directly inquires about HSS (C) with the SIP URI of U1 as keyword, obtains the S-CSCF (C) (step 307) that U1 belongs to.I-CSCF (C) gives after the callee function logic that S-CSCF (C) (step 308), S-CSCF (C) handle the user call forward forward call to U1 (step 309).U1 sends response message to S-CSCF (C) (step 310), S-CSCF (C) transmits this response message and gives I-CSCF (C) (step 311), I-CSCF (C) continues to transmit this response message and gives S-CSCF (M) (step 312), S-CSCF (M) then is transmitted to U2 (step 313), call setup with this response message.

Wherein, initiate recursive query to the DNS-NPDB of number administration territory A (A) in the step 308, obtain the step of the current domain name C of U1 number, can realize by following process:

The DNS-NPDB in A territory returns one to multiple record to S-CSCF (M), and by the different record in the indication of the flag field in the NAPTR record current database, what represent that database directly hits that record returns such as a is the IP address.Also provide ' n ' label of an expansion to represent to carry out the inquiry of ported subscriber among the present invention to be different from the normal hosts address lookup.If wherein do not comprise the current domain name of called number, S-CSCF (M) meets with a response the back according to the SIP URI that the regexp in the response replaces U1, initiates the NAPTR iterative query again, until the domain name that obtains U1 number the current field.

Wherein, the DNS-NPDB that serves in each territory is integrated with dns server, and perhaps this dns server is independently set up, and by standard agreement or this NPDB of proprietary protocol interface accessing, thereby forms this DNS-NPDB.This interface can be a kind of standard agreement (as MAP, Diameter, LDAP etc.) or proprietary protocol interface.

Above steps is described is to adopt an INVITE behind the present invention to call out basic procedure, if INVITE changes other any initial sip request message (comprising instant message, subscription/publication, capability query, REFER etc.) into, call flow is identical.

In the present invention, the most complicated routing procedure was expanded by existing DNS architecture and finished during number carried, and is minimum to the existing standard procedure influence of IMS, do not need allocation External Number resource simultaneously, just determine call path, no signaling circuitous path in the call flow making a start.Simultaneously, do not need to carry, can accomplish the whole network, whole Subscriber Number portability fully by signatory identification number.

And adaptability is good, calls out the control network element as S-CSCF (C) being changed into other IMS such as MGCF/IBCF, and process is also suitable fully.

In addition, the present invention also is applicable to the numbering of TEL URI form, and the keyword that identifies the number administration territory of TEL URI this moment changes the field that trunk prefix, mobile H sign indicating number etc. have other area information into by the domain name of SIP URI.The Subscriber Number that this realization number carries also can be a number E.164.Because DNS possesses the recursive query ability, when the routing iinformation of book server is imperfect, can obtain final required routing iinformation, so extensibility, manageability are good by higher level's server lookup.For example carry when adopting E.164 number when number, home server information is imperfect, can obtain E.164 number number administration domain server address by the NS inquiry, and then finish query function.

Adopt the inventive method can realize carrying scheme based on the IMS number of distributed DNS, its advantage is that existing network is changed minimum, possesses good extensibility and manageability again, and its foundational system is full distributed store, the path of message is shorter, and is less relatively to the time delay that network is introduced.

Claims

1, realize the network configuration that number carries based on the distributed DNS system in a kind of IMS net, it is characterized in that, comprising: number administration territory, number the current field and the number territory of moving into, described number administration territory, number the current field and the number territory of moving into includes:

IMS call treatment network element comprises CSCF, BGCF, MGCF, IBCF;

Adopt the number portability database of DNS access interface, be used for only depositing described number portability database the territory, place the active user data and be carried into the user's in territory, non-described place the territory table of comparisons of moving out from territory, described place;

The IMS home signature user server is used to deposit the movable number resource in territory, described place.

2, network configuration as claimed in claim 1, it is characterized in that, the number portability database of described employing DNS access interface comprises dns server and the number portability database of independently setting up, and described dns server is by MAP, Diameter or the described number portability database of ldap protocol interface accessing.

3, network configuration as claimed in claim 1 is characterized in that, Subscriber Number adopts SIP URI form, TEL URI form or number E.164.

4, network configuration as claimed in claim 1, it is characterized in that, the number portability database of the employing DNS access interface of number the current field of calling subscriber is used for the number administration territory of the described keyword correspondence of keyword query of the query requests initiated according to the IMS call treatment network element of number the current field of calling subscriber.

5, network configuration as claimed in claim 1, it is characterized in that, the number portability database of the employing DNS access interface in called subscriber's number administration territory, be used for the recursive query request initiated according to the number portability database of the employing DNS access interface of number the current field of calling subscriber, number the current field of inquiry called subscriber.

6, network configuration as claimed in claim 1, it is characterized in that, the number portability database of the employing DNS access interface of number the current field of calling subscriber is used for the nodal information of Ingress node of the IMS call treatment network element of iterative query called number the current field.

7, realize the method that number carries based on distributed DNS in a kind of IMS net,, it is characterized in that, comprising based on the described network configuration of claim 1:

8, method as claimed in claim 7 is characterized in that, the signatory step that described called number carries comprises again:

9, method as claimed in claim 8 is characterized in that, the step that receiving system is accepted described application also comprises: called subscriber's public subscriber identification is constant, and private user identity changes to the number sign that the territory distributes of moving into.

10, method as claimed in claim 7 is characterized in that, the step in the called subscriber's of inquiry described in the step 1 number administration territory further comprises:

11, method as claimed in claim 10 is characterized in that, the query script of step 2 further comprises:

12, method as claimed in claim 7 is characterized in that, described step 3 further comprises:

13, method as claimed in claim 12 is characterized in that, the nodal information of Ingress node described in the step 31 comprises: the host name of described Ingress node and IP address.