WO2007056916A1 - Systeme permettant de mettre en oeuvre un service de portabilite de numero, et procede correspondant - Google Patents

Systeme permettant de mettre en oeuvre un service de portabilite de numero, et procede correspondant Download PDF

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Publication number
WO2007056916A1
WO2007056916A1 PCT/CN2006/002336 CN2006002336W WO2007056916A1 WO 2007056916 A1 WO2007056916 A1 WO 2007056916A1 CN 2006002336 W CN2006002336 W CN 2006002336W WO 2007056916 A1 WO2007056916 A1 WO 2007056916A1
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WIPO (PCT)
Prior art keywords
user
network
slf
identifier
npdb
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PCT/CN2006/002336
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English (en)
French (fr)
Inventor
Geng Wang
Fenqin Zhu
Dongming Zhu
Original Assignee
Huawei Technologies Co., Ltd.
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Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to EP06775638A priority Critical patent/EP1950942B1/en
Publication of WO2007056916A1 publication Critical patent/WO2007056916A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0016—Arrangements providing connection between exchanges
    • H04Q3/0029—Provisions for intelligent networking
    • H04Q3/005—Personal communication services, e.g. provisions for portability of subscriber numbers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/09—Mapping addresses
    • H04L61/25—Mapping addresses of the same type
    • H04L61/2596—Translation of addresses of the same type other than IP, e.g. translation from MAC to MAC addresses
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/30—Managing network names, e.g. use of aliases or nicknames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/45—Network directories; Name-to-address mapping
    • H04L61/4505—Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols
    • H04L61/4511—Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols using domain name system [DNS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/45—Network directories; Name-to-address mapping
    • H04L61/4535—Network directories; Name-to-address mapping using an address exchange platform which sets up a session between two nodes, e.g. rendezvous servers, session initiation protocols [SIP] registrars or H.323 gatekeepers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/1016—IP multimedia subsystem [IMS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/4228—Systems providing special services or facilities to subscribers in networks
    • H04M3/42297—Systems providing special services or facilities to subscribers in networks with number portability
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/006—Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP), including next generation networks with a packet-switched transport layer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2101/00—Indexing scheme associated with group H04L61/00
    • H04L2101/30—Types of network names
    • H04L2101/395—Internet protocol multimedia private identity [IMPI]; Internet protocol multimedia public identity [IMPU]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2242/00—Special services or facilities
    • H04M2242/30—Determination of the location of a subscriber
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/42025—Calling or Called party identification service
    • H04M3/42085—Called party identification service
    • H04M3/42102—Making use of the called party identifier
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13095—PIN / Access code, authentication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13097—Numbering, addressing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13102—Common translator
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13103—Memory
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13176—Common channel signaling, CCS7
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13178—Control signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13248—Multimedia

Definitions

  • the present invention relates to the field of communications, and in particular, to a system and method for implementing a number portability service. Background technique
  • Number Portability Service Number Portability is also known as the transfer of the number. That is, after the user replaces the telecommunication operator, the original user number is retained, and the original number is used to communicate with others.
  • the Telecommunications Authority requires fairness and competition, and requires network operators to provide "number portability" services to avoid the inconvenience caused by the need to replace the number after the operator replaces the operator, and to abandon the replacement to provide better quality. More economical operators.
  • the IMS network is the core network of the next generation communication network. As the core session control layer of fixed and mobile networks, it has become the focus of current industry discussions.
  • the IMS protocol specifies that each IMS user has a private user identity and at least one public user identity.
  • the private identity is specified by the user's home network operator. This identity is used to uniquely identify a subscriber in the home network for user registration, authentication, management, and billing. Since the user private identity is not used to route SIP messages, there is no P problem with the private user identity.
  • the public user identity is used as the contact address for communicating with other users, similar to the telephone number referred to in a traditional telecommunications network (such as PSTN).
  • the user's public identity is in SIP URI or Tel URI format.
  • the Tel URI is defined in the protocol RFC 3966, the type can be "+86 755 12345678", and the SIP URI is defined in the protocol RFC 3261, and the type can be "sip: alice@OpemtorA.com". Since the public user ID contains routing information, there is an NP problem with the public user ID.
  • NPDB Numberer Portability Data Base
  • the Diameter redirection function is a concept of an IMS network. Multiple HSSs may exist in an IMS network for storing related data of different users. A user's data may be located in any of these HSSs, and a session request is sent to the user. When you know which HSS the user data is in, you need to use the Diameter redirection function.
  • the method is: I-CSCF first sends the query command to the SLF, the SLF determines the HSS where the user is located, and then the SLF notifies the HSS where the I-CSCF user is located. So that the I-CSCF can query the user data to the correct HSS. In this process, the SLF informs the I-CSCF which HSS to use to query the user data and utilizes the Diameter redirection function.
  • the current P scheme is mainly the NP scheme for the circuit domain CS network described in RFC3482.
  • One of the schemes is OR (Onward Routing). As shown in Figure 1, the scheme includes the following steps:
  • the calling network routes the call to the NP user to sign the network according to the default routing rule
  • the NP user first subscribes to the network query PDB, performs NP address conversion, and obtains new routing information;
  • the above process was designed for the circuit domain network at the time. Since the IMS network and the traditional circuit domain network have great differences in the basic structure, the existing P solution cannot meet the needs of the IMS network, and its main performance is in the signaling process and bearer. Way of establishing.
  • the IMS is based on SIP signaling, when the calling party initiates a session request to the network that the NP user first subscribes to,
  • the network that the NP user subscribes to for the first time can not only forward the session request to the network that the NP user is currently signing, but also send a redirect message to the network where the calling party is located, so that the calling network directly sends a session request to the network that the NP user is currently signing. Therefore, the signaling process of the P-service of the circuit domain is not as flexible as that of the IMS network;
  • the bearer between the calling party and the called party no longer needs to be connected to the network (that is, transit) by the NP user for the first time, but is directly established between the host and the called network. Therefore, in the processing of the NP service, the circuit domain network is not as good as the IMS network in terms of the use efficiency of the bearer resources.
  • the invention provides a system, a method and a subscription relationship locating function entity for implementing a number portability service, which are used to solve the problem that there is no number portability mechanism in the current IMS system.
  • the system for implementing the number portability service of the present invention includes: a number portability database NPDB, where the correspondence between the identifier of the first subscription network assigned by the called user and the identifier of the current subscription network of the user is stored;
  • the subscription relationship locating function entity SLF is configured to query, by the NPDB, the identifier of the current subscription network of the called user by using the identifier information in the session request, to locate the home subscription subscriber server HSS to which the user belongs.
  • a query module is configured in the SLF, and is configured to interact with the NPDB to query an identifier of the current subscription network assignment of the called user.
  • the NPDB is set in the SLF or is independent of the SLF.
  • a private interface is used between the query module and the NPDB.
  • the NPDB is set in the service control function point SCP.
  • the query module is connected to the NPDB through the IM-SSF module with a CAP interface.
  • the NPDB is a domain name server DNS.
  • the network that the called user first subscribes to and the network that the user currently subscribes to are all IMS networks.
  • the HSS to which the called user belongs is not in the same network as the SLF.
  • the SLF belongs to the network that the called user subscribes for the first time.
  • the subscription relationship locating function entity of the present invention includes: a query module, configured to query an identifier of a current subscription network assignment of the called user.
  • the SLF further includes: a number portability database NPDB, where the correspondence between the identifier of the first subscription network assigned by the called user and the identifier of the current subscription network of the user is stored, so that the query module queries.
  • NPDB number portability database
  • the method of the invention comprises the steps of:
  • the SLF queries the identifier of the current subscription network of the called user by using the identifier information in the received session request.
  • the network that the called user first subscribes to and the network that the user currently subscribes to are all IMS networks.
  • the step A includes the following steps: the inquiring call session control function entity I-CSCF in the network that the called user first subscribes forwards the received session request to the SLF; the SLF uses the identification information in the session request.
  • the NPDB corresponding to the number carrying database NPDB queries the identifier of the current subscription network of the user; the NPDB returns the query result to the SLF.
  • the step B includes the following steps: the SLF redirects the query result to the I-CSCF; the I-CSCF locates the HSS currently assigned by the called user by using the identifier information in the query result; I-CSCF and the The HSS interaction is performed to obtain a serving call session control function entity S-CSCF to which the called user belongs; the S-CSCF completes the session request routing.
  • the beneficial effects of the present invention are as follows:
  • the invention adds a query module to the existing SLF, so that it can interact with the PDB to query the identifier of the user's current contracted network allocation; and then use the redirection mechanism to deliver the identifier of the currently subscribed network of the queried user to the queried
  • the I-CSCF enables the I-CSCF to correctly locate the HSS storing the subscription information of the user. In this way, P services can be realized in the IMS system.
  • the present invention also provides a method of implementing a number portability service.
  • the invention not only implements the NP function under the IMS, but also integrates the existing processing mechanism of the IMS in the implementation manner, so that the operator can easily increase the NP function on the basis of the existing equipment. . Therefore, the present invention has outstanding advantages in terms of workability.
  • FIG. 1 is a schematic structural diagram of a circuit domain number carrying system
  • FIG. 2 is a schematic structural view of a system of the present invention
  • FIG. 3 is a schematic structural diagram of a subscription relationship positioning function entity according to the present invention.
  • FIG. 5 is a flow chart of the method signaling of the present invention. detailed description
  • the present invention provides a system for implementing a number portability service.
  • the method includes: an IMS network that the NP user subscribes for the first time and the current subscription of the user. IMS network.
  • the I-CSCF, SLF, and PDB 0 are sequentially connected.
  • the S-CSCF and the HSS are included in the network currently subscribed by the P user.
  • the above SLF is managed in unison with the HSS so that the SLF can be located to the corresponding HSS.
  • the I-CSCF is configured to forward the session request to the SLF after receiving the session request, and query the called user information in the corresponding HSS by using the identifier information redirected by the SLF.
  • the SLF is configured to receive a session request sent by the I-CSCF, and query, by using a built-in query module, the identifier of the current subscription network of the called user by using the identifier information in the session request to the NPDB. And redirecting the queried identification information to the I-CSCF.
  • the NPDB stores therein a correspondence between the identifier of the first subscription network assigned by the called user and the identifier of the current subscription network of the user, for the query module to query.
  • the NPDB may be set in the SLF or may be set in the service control function point SCP. Since the domain name server DNS can record the correspondence between the old and new public user IDs, the NPDB function can also be implemented by using the DNS. If the NPDB is set in the SLF, the query module interacts with the NPDB by using a private interface; if the NPDB is set in the SCP, the query module is connected to the NPDB through the IM-SSF module with a CAP interface.
  • the HSS stores therein current user information of the called user for the I-CSCF query.
  • the S-CSCF is configured to receive a session request sent by the I-CSCF and complete session routing.
  • the present invention provides an SLF, as shown in Fig. 3, which is internally provided with an inquiry module, and further has an NPDB built in.
  • the query module is configured to query an identifier of a current subscription network assignment of the called user.
  • the PDB is configured to store a correspondence between an identifier of a first subscription network assigned by the called user and an identifier of the current subscription network of the user.
  • the present invention provides a method for implementing a number portability service, as shown in FIG. 4 and FIG. 5, which includes the following specific steps (Note: To highlight the main process, some minors are not shown in FIG. Messages, such as 180, 100):
  • the I-CSCF receives the session request.
  • the I-CSCF queries the SLF to query the HSS to which the user belongs.
  • the SLF queries the PDB for the identifier of the currently subscribed network of the called user by using the identifier information in the session request.
  • NPDB returns the query result.
  • the SLF redirects the queried identification information to the I-CSCF.
  • the I-CSCF queries the corresponding HSS for user information.
  • the HSS returns user information to the I-CSCF.
  • the I-CSCF sends a session request to the S-CSCF to complete the session routing.
  • Method Example 1 Take a contracted user from IMS operator A to IMS operator B as an example.
  • the S10 I-CSCF receives the session request.
  • the session request is routed to the I-CSCF in the first subscription network (operator A) of the NP user according to the default routing rule.
  • the I-CSCF queries the SLF to query the HSS to which the user belongs.
  • the I-CSCF After receiving the session request, the I-CSCF queries the SLF for the HSS to which the called user may belong.
  • the SLF queries, by using the identifier information in the session request, the identifier of the current subscription network of the called user to the NPDB.
  • the SLF obtains the identification information of the called user from the session request forwarded by the I-CSCF, that is, the identifier that the NP user subscribes to the network for the first time, and interacts with the PDB through the built-in query module of the SLF.
  • the NPDB returns the query result.
  • NPDB ⁇ Query the identifier of the current subscription network assignment of the NP user according to the correspondence between the identifier of the first subscription network assigned by the called user and the identifier of the current subscription network of the user. After the query, the queried identification information is carried in the query result and returned to the SLF.
  • the SLF redirects the queried identification information to the I-CSCF.
  • the SLF After receiving the query result, the SLF obtains the identifier of the current subscription network allocation of the NP user, and compares the identifier of the current subscription network of the acquired NP user with the identifier of the first subscription network of the user. It is determined whether the user is an NP user (in this example, the user is changed to the operator B by the operator A, so the user is an NP user).
  • the SLF sends a redirect message to the I-CSCF, where the message carries the identifier of the current subscription network assignment of the NP user.
  • the I-CSCF queries the corresponding HSS for user information. Since the SLF of the present invention is managed in a unified manner with each HSS, the identifier of the current subscription network assignment of the NP user necessarily points to the HSS to which the NP user belongs (the HSS is in the network of the operator B), so the I-CSCF ⁇ The identifier of the current contracted network assignment of the NP user can query the corresponding HSS for user information.
  • the HSS returns user information to the I-CSCF.
  • the user information is returned to the I-CSCF.
  • the user information includes the S-CSCF to which the user is currently assigned (if the user is not assigned an S-CSCF, the user is assigned an S-CSCF in the current subscription network according to the existing IMS protocol).
  • the I-CSCF sends a session request to the S-CSCF to complete the session routing.
  • the I-CSCF carries the identifier of the first subscription network assignment of the NP user in the session request (INVITE message), and forwards the session request sent by the calling party directly to the S-CSCF. And registering the identifier of the first subscription network of the NP user in the current subscription network of the user, so that the S-CSCF routes the session request to the NP user, and completes the session routing.
  • Method Example 2 In order to embody the versatility of the present invention in conjunction with the system and apparatus of the present invention, a case where a called user has not changed the contracted network is taken as an example.
  • the I-CSCF receives the session request.
  • the session request When a calling user initiates a session request to a user, according to the default routing rule, the session request will be routed to the I-CSCF of the called subscriber's first subscription network.
  • the I-CSCF queries the SLF to query the HSS to which the user belongs.
  • the I-CSCF After receiving the session request, the I-CSCF queries the SLF for the HSS to which the called user may belong.
  • the SLF queries the NPDB corresponding identifier of the current subscription network of the called user by using the identifier information in the session request.
  • the SLF obtains the identification information of the called user from the session request forwarded by the I-CSCF, that is, the identifier of the network that the called user subscribes to the network for the first time, and interacts with the NPDB through the query module built in the SLF. Query the identifier of the current subscription network assignment of the user.
  • the NPDB returns the query result.
  • the NPDB is assigned to the user according to the identifier of the first subscription network assigned by the called user.
  • the correspondence between the identifiers of the network of the former contracted network is used to query the identifier of the current contracted network assignment of the NP user. After the query, the queried identification information is carried in the query result and returned to the SLF.
  • the SLF redirects the queried identification information to the I-CSCF.
  • the SLF After receiving the query result, the SLF obtains the identifier of the currently subscribed network of the called user, and compares the identifier of the currently subscribed network of the obtained called user with the identifier of the first subscription network of the user. To determine if the user is an NP user. In this example, the user has not changed the subscription network (that is, the identifier of the current subscription network assigned by the called user is the identifier of the first time the user subscribes to the network), so the user is not an NP user.
  • the SLF still sends a redirect message to the I-CSCF, where the message carries the identifier of the current subscription network assignment of the called user.
  • the I-CSCF queries the corresponding HSS for user information.
  • the identifier of the currently subscribed network of the called user necessarily points to the HSS to which the called user belongs, so the I-CSCF is based on The identifier of the currently subscribed network of the called user may query the corresponding HSS for user information.
  • the HSS returns user information to the I-CSCF.
  • the user information is returned to the I-CSCF.
  • the user information includes the S-CSCF to which the user is currently assigned (if the user is not assigned an S-CSCF, the user is assigned an S-CSCF in the current subscription network according to the existing IMS protocol).
  • the I-CSCF sends a session request to the S-CSCF to complete the session routing.
  • the I-CSCF carries the identifier of the called subscriber's first subscription network in the session request (INVITE message), and forwards the session request sent by the calling party directly to the S-CSCF. And the identifier of the first subscription network of the called user is registered in the current subscription network of the user, so that the S-CSCF routes the session request to the called user to complete the session routing.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Telephonic Communication Services (AREA)

Description

一种实现号码携带业务的系统及方法 ' 技术领域
本发明涉及通信领域， 特别是涉及一种实现号码携带业务的系统及方法。 背景技术
号码携带业务 Number Portability也称移机不改号业务。 即用户更换电信 运营商后， 还保留原有的用户号码， 使用原有号码与他人通讯。
由于 NP业务为用户更换运营商带来了极大的方便。目前很多国家和地区 的电信管理局为了公平竟争， 要求各网络运营商必须提供 "号码携带" 业务， 以避免用户更换运营商后必须更换号码所带来的不便， 而放弃更换到提供更 优质、 更经济的运营商。
IMS 网络是下一代通信网的核心网。 作为固定和移动网络的核心会话控 制层， 已成为目前业界讨论重点。 IMS协议规定每个 IMS用户有一个私有用 户标识和至少一个公有用户标识。 私有标识由用户归属网络运营商指定， 这 个标识被用来在归属网络唯一标识一个签约用户， 用于用户注册， 鉴权， 管 理， 和计费等方面。 由于用户私有标识不用来路由 SIP 消息， 因此私有用户 标识不存在 P问题。公有用户标识被用作与其他用户通信的联系地址， 类似 于传统电信网（如 PSTN )中所指电话号码。用户公有标识采用 SIP URI或 Tel URI格式。 Tel URI在协议 RFC 3966定义， 型式可以是 "+86 755 12345678" , SIP URI在协议 RFC 3261定义， 型式可以是 " sip: alice@OpemtorA.com"。 由 于公有用户标识包含了路由信息， 因此公有用户标识存在 NP问题。
号码 NP业务的需求在 IMS网络仍然存在， 用户往往不希望因为更换运营 商而更换原有的用户公有标识。 比如运营商 A下的一个用户（其公有用户标识 为： sip: alice@OperatorA.com ) , 现在要更改到运营商 B提供服务， 其通常愿 意保留此联系方式（alice@OperatorA.com ) 不变， 否则不得不——通知其同 事、 朋友和亲属等。 按照 IMS的路由规则，只有用户的当前归属的运营商为此用户分配的公有 用户标识被用于路由， 当用户更改运营商后， 还是需要为用户新分配用户公 有标识的 （比如 alice@OperatorB.com ) , 否则若还用以前的运营商分配的公 有用户标识， 在不故任何特殊处理的情况下， 发向此用户的呼叫必然会被送 到此用户以前的运营商。按照 RFC3482协议的描述，在主叫网络或用户以前的 运营商网络中必须存在一个数据库， 用于将用户旧的地址（用户以前归属的 运营商分配的用户公有标识） ， 转换成用户新的地址（用户当前归属的运营 商分配的用户公有标识）或其它等效的路由信息， 才可最终将呼叫接续到被 叫用户。 这个数据库称为 NPDB ( Number Portability Data Base )。
Diameter重定向功能是 IMS网络的一个概念， 一个 IMS网络中可能存在多 个 HSS用于存放不同用户的相关数据，一个用户的数据可能位于这些 HSS中的 任何一个， 当有会话请求发往此用户时， 如何知道用户数据在哪个 HSS, 就要 运用 Diameter重定向功能， 方法是： I-CSCF先将查询命令发往 SLF, 由 SLF判 断用户所在的 HSS, 然后 SLF通知 I-CSCF用户所在的 HSS, 这样 I-CSCF就能够 到正确的 HSS查询用户数据了。 这个过程中， SLF通知 I-CSCF在哪个 HSS去查 询用户数据就利用了 Diameter的重定向功能。
目前的 P方案主要是 RFC3482描述的用于电路域 CS网络的 NP方案。 其中一种方案是 OR(Onward Routing), 参见图 1所示， 该方案包括下列步骤：
1、 当有呼叫产生时（此呼叫的被叫是一个 NP用户）， 主叫所在的网络按 照缺省的路由规则将呼叫路由到 NP用户笫一次签约的网络；
2至 3、 该 NP用户第一次签约的网络查詢 PDB, 进行 NP地址转换， 得到新的路由信息；
4、 最终将呼叫路由到 NP用户当前所签约的网络。
上述流程当时是为电路域网络设计的， 由于 IMS网络与传统电路域网络 在基本结构就有很大的不同， 现有的 P方案不能满足 IMS网络的需要， 其 主要表现在信令过程和承载建立方式上。
IMS基于 SIP信令，当主叫向 NP用户第一次签约的网络发起会话请求时， NP用户第一次签约的网络不仅可以将会话请求转发给 NP用户当前签约的网 络，也可以向主叫所在网络发送重定向消息， 让主叫网络直接向 NP用户当前 所签约的网络发送会话请求， 因此电路域的 P业务的信令过程不如 IMS网 络的灵活；
承载建立方式上， 在 IMS下， 主叫与被叫间的承载不再需要通过 NP用 户第一次签约的网络汇接（即中转）， 而是直接在主、 被叫所在网络间建立即 可，因此在 NP业务的处理中，在承载资源的使用效率上，电路域网络不如 IMS 网络。
综上所述， 目前 IMS系统中没有号码携带机制， 是 IMS系统在应用业务上 的一个重要缺失。 发明内容
本发明提供一种实现号码携带业务的系统、 方法及订购关系定位功能实 体， 用以解决目前 IMS系统中没有号码携带机制的问题。
本发明的实现号码携带业务的系统， 包括： 号码携带数据库 NPDB, 其 内存储有被叫用户的第一次签约网络分配的标识与该用户当前签约网络分配 的标识之间的对应关系；
订购关系定位功能实体 SLF，用于以会话请求中的标识信息向所述 NPDB 对应查询被叫用户当前签约网络分配的标识， 以定位该用户当前归属的归属 签约用户服务器 HSS。
所述 SLF中设置有查询模块， 用于与所述 NPDB交互， 查询被叫用户当 前签约网络分配的标识。
所述 NPDB设置在所述 SLF中， 或者与所述 SLF相互独立。
若所述 NPDB设置在 SLF中， 则所述查询模块与 NPDB之间采用私有接 口。
所述 NPDB设置在业务控制功能点 SCP中。 所述查询模块通过 IM-SSF 模块以 CAP接口与 NPDB连接。 所述 NPDB为域名服务器 DNS。
所述被叫用户第一次签约的网絡和该用户当前签约的网络均为 IMS 网 絡。所述被叫用户当前归属的 HSS与 SLF不在同一个网络中。所述 SLF归属 于所述被叫用户第一次签约的网络。
在所述被叫用户当前签约的网络中注册该用户第一次签约网络分配的标 识。
本发明的订购关系定位功能实体包括： 查询模块， 用于查询被叫用户当 前签约网络分配的标识。
所述 SLF还包括： 号码携带数据库 NPDB， 其内存储有被叫用户的第一 次签约网絡分配的标识与该用户当前签约网络分配的标识之间的对应关系， 以备所述查询模块查询。
本发明方法包括步骤：
A、 SLF以收到的会话请求中的标识信息对应查询被叫用户当前签约网络 分配的标识； B、 SLF将查询到的标识重定向， 以完成所述会话请求的正确路 由。
所述被叫用户第一次签约的网络和该用户当前签约的网络均为 IMS 网 络。
在所述被叫用户当前签约的网络中注册该用户第一次签约网絡分配的标 识。
所述步骤 A包括下列步骤： 所述被叫用户第一次签约的网络中的查询呼 叫会话控制功能实体 I-CSCF将收到的会话请求转发到 SLF; SLF以所述会话 请求中的标识信息向号码携带数据库 NPDB对应'查询该用户当前签约网络分 配的标识； NPDB向 SLF返回查询结果。
所述步骤 B 包括下列步骤： SLF向所述 I-CSCF重定向所述查询结果； I-CSCF 以所述查询结果中的标识信息定位所述被叫用户当前归属的 HSS; I-CSCF与所述 HSS交互，获取所述被叫用户当前归属的服务呼叫会话控制功 能实体 S-CSCF; 所述 S-CSCF完成会话请求路由。 本发明有益效果如下：
本发明在现有的 SLF中添加了查询模块， 使其可与 PDB交互， .来查询 用户当前签约网絡分配的标识； 再利用重定向机制将查询到的用户当前签约 网络分配的标识下发到 I-CSCF, 使 I-CSCF可正确定位存储有所述用户的签 约信息的 HSS。 这样在 IMS系统中即可实现 P业务。
本发明还提供了一种实现号码携带业务的方法。
本发明在 IMS规定的构架基础上， 不仅实现了 IMS下的 NP功能， 而且在 实现的方式上尽量接合 IMS现有的处理机制， 使得运营商可以在现有设备基 础上很容易地增加 NP功能。 因此， 本发明在可实施性方面有突出的优点。 附图说明
图 1为电路域号码携带系统结构示意图；
图 2为本发明系统结构示意图；
图 3为本发明订购关系定位功能实体结构示意图；
图 4为本发明方法步骤流程图；
图 5为本发明方法信令流程图。 具体实施方式
为了使 IMS系统可提供号码携带（ P )业务， 本发明提供了一种实现号 码携带业务的系统， 参见图 2所示， 其包括： NP用户第一次签约的 IMS网络 和该用户当前签约的 IMS网络。
在所述 NP 用户第一次签约的网络中包括依次相连的 I-CSCF、 SLF 和 PDB0
在所述 P用户当前签约的网络中包括 S-CSCF和 HSS。
上述 SLF与 HSS统一管理， 以使所述 SLF可定位到相应的 HSS。
所述 I-CSCF用于在收到会话请求后， 向所述 SLF转发该会话请求，并以 所述 SLF重定向的标识信息到相应的 HSS中查询被叫用户信息。 所述 SLF用于接收所述 I-CSCF发来的会话请求，并通过其内置的查询模 块， 以所述会话请求中的标识信息向所述 NPDB对应查询被叫用户当前签约 网络分配的标识， 并将查询到的标识信息重定向到所述 I-CSCF。
所述 NPDB其内存储有被叫用户的第一次签约网络分配的标识与该用户 当前签约网络分配的标识之间的对应关系， 以备所述查询模块查询。 所述 NPDB可设置在所述 SLF中， 也可设置在业务控制功能点 SCP中。 由于域名 服务器 DNS可记录新旧公有用户标识的对应关系， 因此， 利用 DNS也可实 现 NPDB功能。 若所述 NPDB设置在 SLF中， 则所述查询模块与 NPDB之间 采用私有接口交互；若所述 NPDB设置在 SCP中，则所述查询模块通过 IM-SSF 模块以 CAP接口与 NPDB连接。
所述 HSS其内存储有被叫用户当前的用户信息， 以备所述 I-CSCF查询。 所述 S-CSCF, 用于接收 I-CSCF发来的会话请求， 并完成会话路由。 对应上述系统本发明提供了一种 SLF, 参见图 3所示， 其内部设置有查 询模块， 进一步还可内置 NPDB。
所述查询模块用于查询被叫用户当前签约网络分配的标识。
所述 PDB用于存储被叫用户的第一次签约网络分配的标识与该用户当 前签约网络分配的标识之间的对应关系。
应用上述系统及装置， 本发明提供了一种实现号码携带业务的方法， 参 见图 4和图 5所示， 其包括下列具体步骤（注： 为突出主要流程， 图 5中未 画出一些次要消息， 如 180、 100 ):
51、 I-CSCF收到会话请求。
52、 I-CSCF到 SLF查询用户所属 HSS。
53、 SLF以会话请求中的标识信息向 PDB对应查询被叫用户当前签约 网络分配的标识。
54、 NPDB返回查询结果。
55、 SLF向 I-CSCF重定向查询到的标识信息。
56、 I-CSCF向相应的 HSS查询用户信息。 57、 HSS向 I-CSCF返回用户信息。
58、 I-CSCF向 S-CSCF发送会话请求， 完成会话路由。
以下通过两个实例具体描述本发明方法。
方法实例一： 以某被叫用户从 IMS运营商 A改签约到 IMS运营商 B为 例。
S10 I-CSCF收到会话请求。
当某主叫用户向一 NP用户发起会话请求时，按照缺省的路由规则，会话 请求将被路由到该 NP用户第一次签约网络（运营商 A ) 中的 I-CSCF。
5102、 I-CSCF到 SLF查询用户所属 HSS。
所述 I-CSCF收到所述会话请求后，向 SLF查询被叫用户可能归属的 HSS。
5103、 SLF以会话请求中的标识信息向 NPDB对应查询被叫用户当前签 约网络分配的标识。
所述 SLF从 I-CSCF转发来的会话请求中获取被叫用户的标识信息，即所 述 NP用户第一次签约网络分配的标识， 并通过所述 SLF内置的查询模块与 PDB交互， 来查询该用户当前签约网络（运营商 B )分配的标识。
5104、 NPDB返回查询结果。
NPDB ■据其存储的被叫用户的第一次签约网络分配的标识与该用户当 前签约网络分配的标识之间的对应关系，查询所述 NP用户当前签约网络分配 的标识。查询后，将查询到的标识信息携带于查询结果中，并返回到所述 SLF。
5105、 SLF向 I-CSCF重定向查询到的标识信息。
SLF收到所述查询结果后，从中获取所述 NP用户当前签约网络分配的标 识，并以所述获取的 NP用户当前签约网络分配的标识与该用户第一次签约网 络分配的标识对比， 以判断该用户是否为 NP用户（本例中该用户由运营商 A 改签约到运营商 B, 所以该用户是 NP用户）。
SLF向 I-CSCF发送重定向消息， 在该消息中携带所述 NP用户当前签约 网络分配的标识。
5106、 I-CSCF向相应的 HSS查询用户信息。 由于本发明的 SLF与各个 HSS统一管理， 所以所述 NP用户当前签约网 络分配的标识必然指向 NP用户当前归属的 HSS (该 HSS在运营商 B的网络 中）,所以 I-CSCF ^^椐所述 NP用户当前签约网络分配的标识可向相应的 HSS 查询用户信息。
5107、 HSS向 I-CSCF返回用户信息。
HSS查询后， 向 I-CSCF返回用户信息。 所述用户信息包括用户当前归属 的 S-CSCF (如果该用户未被分配 S-CSCF, 则按照 IMS现有协议为该用户分 配一个其当前签约网络中的 S-CSCF )。
5108、 I-CSCF向 S-CSCF发送会话请求， 完成会话路由。
I-CSCF 将所述 NP 用户第一次签约网络分配的标识携带于会话请求 ( INVITE消息） 中， 即将主叫侧发来的会话请求直接转发到所述 S-CSCF。 并且将所述 NP 用户第一次签约网络分配的标识在该用户当前签约网络中注 册， 使所述 S-CSCF将会话请求路由到该 NP用户， 完成会话路由。
方法实例二： 为了结合本发明的系统及装置来体现本发明的通用性， 以 某被叫用户没有更改过签约网络为例。
5201、 I-CSCF收到会话请求。
当某主叫用户向一用户发起会话请求时， 按照缺省的路由规则， 会话请 求将被路由到该被叫用户第一次签约网络中的 I-CSCF。
5202、 I-CSCF到 SLF查询用户所属 HSS。
所述 I-CSCF收到所述会话请求后，向 SLF查询被叫用户可能归属的 HSS。
S203、 SLF以会话请求中的标识信息向 NPDB对应查询被叫用户当前签 约网络分配的标识。
所述 SLF从 I-CSCF转发来的会话请求中获取被叫用户的标识信息，即所 述被叫用户第一次签约网络分配的标识， 并通过所述 SLF内置的查询模块与 NPDB交互， 来查询该用户当前签约网络分配的标识。
S204、 NPDB返回查询结果。
NPDB根据其存储的被叫用户的第一次签约网络分配的标识与该用户当 前签约网络分配的标识之间的对应关系，查询所述 NP用户当前签约网络分配 的标识。查询后，将查询到的标识信息携带于查询结果中，并返回到所述 SLF。
5205、 SLF向 I-CSCF重定向查询到的标识信息。
SLF 收到所述查询结果后， 从中获取所述被叫用户当前签约网络分配的 标识， 并以所述获取的被叫用户当前签约网络分配的标识与该用户第一次签 约网絡分配的标识对比， 以判断该用户是否为 NP用户。本例中该用户没有更 改过签约网络（即被叫用户当前签约网络分配的标识就是该用户第一次签约 网络分配的标识）， 所以该用户不是 NP用户。
SLF仍然向 I-CSCF发送重定向消息，在该消息中携带所述被叫用户当前 签约网络分配的标识。
5206、 I-CSCF向相应的 HSS查询用户信息。
由于本发明的 SLF与各个 HSS统一管理（本例 SLF与 HSS在同一个网 络中）， 所以所述被叫用户当前签约网络分配的标识必然指向被叫用户当前归 属的 HSS,所以 I-CSCF根据所述被叫用户当前签约网络分配的标识可向相应 的 HSS查询用户信息。
5207、 HSS向 I-CSCF返回用户信息。
HSS查询后， 向 I-CSCF返回用户信息。 所述用户信息包括用户当前归属 的 S-CSCF (如果该用户未被分配 S-CSCF, 则按照 IMS现有协议为该用户分 配一个其当前签约网络中的 S-CSCF )。
5208、 I-CSCF向 S-CSCF发送会话请求， 完成会话路由。
I-CSCF 将所述被叫用户第一次签约网络分配的标识携带于会话请求 ( INVITE消息） 中， 即将主叫侧发来的会话请求直接转发到所述 S-CSCF。 并且将所述被叫用户第一次签约网络分配的标识在该用户当前签约网络中注 册， 使 S-CSCF将会话请求路由到该被叫用户， 完成会话路由。 发明的精神和范围。 这样， 倘若本发明的这些修改和变型属于本发明权利要 求及其等同技术的范围之内， 则本发明也意图包含这些改动和变型在内。

Claims

权 利 要 求
1、 一种实现号码携带业务的系统， 包括： 号码携带数据库 NPDB, 其内 存储有被叫用户的第一次签约网络分配的标识与该用户当前签约网络分配的 标识之间的^ "应关系；
其特征在于， 所述系统还包括：
订购关系定位功能实体 SLF ,用于以会话请求中的标识信息向所述 NPDB 对应查询被叫用户当前签约网络分配的标识， 以定位该用户当前归属的归属 签约用户服务器 HSS。
2、如权利要求 1所述的系统，其特征在于，所述 SLF中设置有查询模块， 用于与所述 PDB交互， 查询被叫用户当前签约网络分配的标识。
3、 如权利要求 2所述的系统， 其特征在于， 所述 NPDB设置在所述 SLF 中， 或者与所述 SLF相互独立。
4、 如权利要求 3所述的系统， 其特征在于， 若所述 PDB设置在 SLF 中， 则所述查询模块与 NPDB之间采用私有接口。
5、 如权利要求 2所述的系统， 其特征在于， 所述 NPDB设置在业务控制 功能点 SCP中。
6、 如权利要求 5所述的系统， 其特征在于， 所述查询模块通过 IM-SSF 模块以 CAP接口与 NPDB连接。
7、 如权利要求 2所述的系统， 其特征在于， 所述 NPDB为域名服务器 DNS„
8、 如权利要求 2所述的系统， 其特征在于， 所述被叫用户第一次签约的 网络和该用户当前签约的网络均为 IMS网络。
9、 如权利要求 8 所述的系统， 其特征在于， 所述被叫用户当前归属的 HSS与 SLF不在同一个网络中。
10、 如权利要求 9所述的系统， 其特征在于， 所述 SLF归属于所述被叫 用户第一次签约的网络。
11、 如权利要求 8至 10任一项所述的系统， 其特征在于， 在所述被叫用 户当前签约的网络中注册该用户第一次签约网络分配的标识。
12、 一种订购关系定位功能实体， 其特征在于， 所述订购关系定位功能 实体 SLF包括： 查询模块， 用于查询被叫用户当前签约网络分配的标识。
13、 如权利要求 12所述的实体， 其特征在于， 所述 SLF还包括： 号码携 带数据库 NPDB, 其内存储有被叫用户的第一次签约网络分配的标识与该用 户当前签约网絡分配的标识之间的对应关系， 以备所述查询模块查询。
14、 一种实现号码携带业务的方法， 其特征在于， 包括下列步骤：
A、 SLF以收到的会话请求中的标识信息对应查询被叫用户当前签约网络 分配的标识；
B、 SLF将查询到的标识重定向， 以完成所述会话请求的正确路由。
15、 如权利要求 14所述的方法， 其特征在于， 所述被叫用户第一次签约 的网絡和该用户当前签约的网络均为 IMS网络。
16、 如权利要求 14或 15所述的方法， 其特征在于， 在所述被叫用户当 前签约的网絡中注册该用户第一次签约网络分配的标识。
17、如权利要求 16所述的方法，其特征在于，所述步骤 A包括下列步骤： -所述被叫用户第一次签约的网络中的查询呼叫会话控制功能实体
I-CSCF将收到的会话请求转发到 SLF;
-SLF以所述会话请求中的标识信息向号码携带数据库 NPDB对应查询该 用户当前签约网络分配的标识；
-NPDB向 SLF返回查询结果。
18、如权利要求 16所述的方法，其特征在于，所述步骤 B包括下列步骤： -SLF向所述 I-CSCF重定向所述查询结果；
-I-CSCF 以所述查询结果中的标识信息定位所述被叫用户当前归属的 HSS;
-I-CSCF与所述 HSS交互， 获取所述被叫用户当前归属的服务呼叫会话 控制功能实体 S-CSCF; 所迷 S-CSCF完成会话请求路由
PCT/CN2006/002336 2005-11-15 2006-09-11 Systeme permettant de mettre en oeuvre un service de portabilite de numero, et procede correspondant WO2007056916A1 (fr)

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