WO2012079451A1 - 用户漫游方法及ics增强网络 - Google Patents

用户漫游方法及ics增强网络 Download PDF

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Publication number
WO2012079451A1
WO2012079451A1 PCT/CN2011/082892 CN2011082892W WO2012079451A1 WO 2012079451 A1 WO2012079451 A1 WO 2012079451A1 CN 2011082892 W CN2011082892 W CN 2011082892W WO 2012079451 A1 WO2012079451 A1 WO 2012079451A1
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Prior art keywords
session
bpf
tas
invitation message
ifc
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PCT/CN2011/082892
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English (en)
French (fr)
Inventor
陶全军
郝振武
吴建华
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中兴通讯股份有限公司
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Publication of WO2012079451A1 publication Critical patent/WO2012079451A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10Architectures or entities
    • H04L65/1016IP multimedia subsystem [IMS]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10Architectures or entities
    • H04L65/1063Application servers providing network services
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066Session management
    • H04L65/1069Session establishment or de-establishment

Definitions

  • the present invention relates to roaming technology in an IP Multimedia Subsystem (IMS) network architecture, and more particularly to a user roaming method based on IMS (IMS, IMS Centralized Service) and an ICS enhanced network.
  • IMS IP Multimedia Subsystem
  • the IP (Internet Protocol) Multimedia Subsystem is an IP-based network architecture proposed by the 3rd Generation Partnership Project (3GPP). An open and flexible business environment that supports multimedia applications and provides users with rich multimedia services.
  • the IMS has nothing to do with the access technology.
  • the IMS can also provide services for the general packet radio service (GPRS, General Packet Radio Service), wireless local area network (WLAN), and other (PS, Packet Switching) access networks.
  • GPRS General Packet Radio Service
  • WLAN wireless local area network
  • PS Packet Switching
  • GSM Global System for Mobile communications
  • UMTS Universal Mobile Telecommunications System
  • the mobile network such as GSM and UMTS adopts a circuit switching technology, which is called a circuit (CS) circuit, and can provide basic voice services and supplementary services based on voice services.
  • CS circuit switching technology
  • IMS IMS centralized service
  • IMS centralized control traffic is a schematic diagram As shown in FIG.
  • the architecture includes: User Equipment (UE, User Equipment) 101, Universal Mobile Telecommunication System Radio Access Network (UTRAN) EDGE GSM Radio Access Network (GERAN) 102, ICS Mobile Switch Center Server (ICS MSC Server) 103, CS-MGW (CS Media Gateway) 104, attribution a User Subscriber Server (HSS) 105, a Call Session Control Function (CSCF), and a Telephony Application Server (TAS) 107;
  • UE User Equipment
  • UTRAN Universal Mobile Telecommunication System Radio Access Network
  • GERAN EDGE GSM Radio Access Network
  • ICS MSC Server ICS Mobile Switch Center Server
  • HSS User Subscriber Server
  • CSCF Call Session Control Function
  • TAS Telephony Application Server
  • UTRAN/GERAN 102 responsible for radio resource access control and management
  • the ICS MSC Server 103 in addition to completing the access, mobility management, and call control functions of the CS user equipment, functions as a User Initiation Protocol (SIP) of the Session Initiation Protocol (SIP), and implements conversion between CS signaling and SIP messages. Instead of the user accessing the IMS.
  • SIP User Initiation Protocol
  • SIP Session Initiation Protocol
  • CS-MGW 104 which is responsible for providing media resources and managing and controlling media resources
  • the HSS 105 is used to save the user's subscription data and provide support for the call or session.
  • CSCF 106 queries which are further divided into CSCF (I-CSCF, Interrogating CSCF ) benign and monthly service (S-CSCF, Serving CSCF) 0 I-CSCF interacts with the HSS, HSS requesting user is assigned S-CSCF, user query, or S-CSCF; S-CSCF provides users with registration, call control and other functions.
  • I-CSCF Interrogating CSCF
  • S-CSCF Serving CSCF
  • TAS 107 which is responsible for handling traditional CS domain telephony services.
  • the UE 101 accesses the ICS MSC Server 103 through CS control signaling, and the ICS MSC Server acts as a user agent, instead of the CS user equipment 101 accessing the CSCF 104 of the IMS network, and establishing a session connection with the remote user, while the ICS MSC Server 103 controls
  • the CS-MGW 104 performs the conversion between the media stream on the CS bearer and the media stream on the IP bearer, establishing a media connection between the user device 101 and the remote user.
  • the core network is finally developed to be managed by IMS, which is recognized by the industry.
  • 3GPP has developed ICS technology in version 8, and enhances CS through MSC Server.
  • the network accesses the IMS network, which is a key technology for the evolution of the CS network to the IMS network.
  • the existing ICS technology does not consider reducing the cost of ICS MSC.
  • the existing standards are only enhanced on the basis of the traditional Mobile Switch Center (MSC), which supports ICS service triggering. In fact, if the service By uniformly migrating to the IMS network, the ICS MSC can be simplified to reduce core network costs.
  • the industry proposes an ICS enhanced network architecture to weaken the MSC Server function.
  • the solution CS network completely sinks to the access layer, so the network structure is relatively simple, no longer relying on CS Core and No. 7 Signaling network.
  • FIG. 2 is a schematic diagram of the ICS enhanced network architecture. As shown in Figure 2, on the basis of the structure shown in Figure 1, the following new network elements are included:
  • the difference between the mAGCF 203 and the MSC MSC Server 104 is mainly that the mAGCF mainly provides signaling conversion between the CS and the SIP, and no longer has the traditional CS domain.
  • the MSC Server provides user access management and service control functions, and also eliminates the interface with the traditional CS network.
  • the interworking between the mAGCF 203 and the traditional CS network passes the media gateway control function entity of the IMS network (MGCF, Media Gate Control Function). ) Implementation.
  • Figure 3 shows the registration procedure of the ICS enhanced service.
  • the UE accesses the IMS network through the mAGCF and initiates registration on the IMS network.
  • the process in Figure 3 focuses on the location update process and the IMS registration process for the CS domain, ignoring the security authentication process.
  • the ICS Enhanced Registration process consists of the following steps:
  • Step 301 to step 302 the UE initiates a CS attach procedure on the CS access network, and sends a CS location update request message to the ICS MSC Server, where the CS location update request message carries the UE's international mobile subscriber identity (IMSI, International Mobile Subscriber Identification) Number );
  • Step 303: The ICS MSC Server converts the received location update request message into a SIP registration message, obtains a user home domain name according to the identity identifier IMSI, and sends a registration message to the UE home domain IMS network entry network element I-CSCF, where the registration message is carried by The Private User Identity (PVI, Private User Identity) derived by the ICS MSC Server based on the IMSI of the UE.
  • IMSI international mobile subscriber identity
  • Step 304 The I-CSCF receives the registration message, and queries the HSS for the registration status, where the inquiry message carries the PVI of the UE.
  • the HSS searches for the current UE registration status according to the PVI of the UE. If it is a re-registration, it returns the S-CSCF address of the UE to register. If it is the first registration, the HSS selects an S-CSCF address or returns an S-CSCF capability list.
  • Step 305 If the HSS returns the S-CSCF address information, the I-CSCF forwards the registration request message to the S-CSCF. If the HSS returns the S-CSCF capability list, the I-CSCF selects a capability-compliant S-CSCF. And forward the registration request message to it;
  • Step 306 the S-CSCF receives the registration request message, which may trigger the authentication process.
  • the description is not described here;
  • Step 307 The S-CSCF obtains user service subscription data from the HSS.
  • Step 308 the S-CSCF returns a registration success message to the mAGCF, where the registration success message carries a list of public user identifiers (PUI, Public User Identity) available to the UE and a default PUI;
  • PUI public user identifiers
  • Step 309 The mAGCF saves the S-CFCF address and the user identifier list and the default PUI, and returns a location update success message to the UE.
  • the MSC function is weakened, no longer has the service processing function, only responsible for protocol conversion and resource management work, service triggering and control are centralized to the home IMS core network, and for the traditional CS network roaming mechanism, service control and The trigger is handled by the visited MSC, so that, according to the existing ICS enhancement technology, the traditional user cannot be triggered when roaming to the aforementioned ICS enhanced network.
  • the main object of the present invention is to provide a user roaming method and an ICS enhanced network, which can implement ICS enhanced network compatibility with other mobile network users.
  • a user roaming method in which a BPF (Bounds Proxy Function) is added to an ICS enhanced network; the method includes:
  • the mAGCF After receiving the call setup request message of the UE of the non-ICS enhanced network, the mAGCF sends a session invite message to the marginal proxy function network element BPF;
  • the BPF triggers third-party service control by using a local initial filter control (L-iFC), and forwards the received session invitation message to a local telephony application server (L-TAS, Local Telephony Application Server);
  • L-iFC local initial filter control
  • L-TAS Local Telephony Application Server
  • the L-TAS After receiving the session invitation message, the L-TAS triggers a circuit switching (CS, Circuit Switching) domain service control, and establishes a session with the peer end as a proxy of the UE after the triggering succeeds.
  • CS Circuit Switching
  • the method before the sending, by the mAGCF, the session invitation message to the BPF, the method further includes: the mAGCF determining whether the UE is registered, and if yes, sending a session invitation message to the BPF address acquired during registration, the session invitation message
  • MSISDN Mobile Subscriber International ISDN
  • the mobile subscriber international number (MSISDN, Mobile Subscriber International ISDN) information of the UE obtained during registration is carried in; if not, the call is rejected.
  • MSISDN Mobile Subscriber International ISDN
  • the method further includes:
  • the BPF generates the L-iFC when the UE registers.
  • the BPF generates the L-iFC as:
  • the BPF determines the destination L-TAS, sets the determined destination L-TAS address as an application server (AS, Application Server) address parameter in the L-iFC, and determines an L-iFC service trigger event and corresponding logic.
  • AS Application Server
  • the BPF is controlled by local initial filtering as:
  • the BPF searches for the registration information of the UE according to the calling number in the received session invitation message, and triggers the third party control according to the L-iFC in the registration information;
  • the BPF matches the service triggering event of the L-iFC and the corresponding logic, and forwards the session invitation message to the L-TAS address carried in the L-iFC.
  • the method further includes:
  • the L-TAS After receiving the session invitation message, the L-TAS saves the session information in the session invitation message; the session information includes at least one of the following information: a calling user number, a called user number, a session identifier, and a session media. Related Information.
  • the L-TAS is used as a proxy of the UE, and the session established to the peer end is specifically: the L-TAS newly initiates a session, and forwards the session information, and the newly initiated session is compared with the previously received session. Make an association.
  • An ICS enhanced network including mAGCF, BPF, and L-TAS;
  • a mAGCF configured to send a session invitation message to the BPF after receiving a call setup request message of the UE of the non-ICS enhanced network
  • the BPF is configured to trigger third-party service control by using the L-iFC, and forward the received session invitation message to the L-TAS;
  • the L-TAS after receiving the session invitation message, triggers the CS service control, and establishes a session with the peer as a proxy of the UE after the trigger is successful.
  • the mAGCF sends the session invitation message to the BPF, it is further determined whether the UE is registered, and if it is already registered, the session invitation message is sent to the BPF address obtained by the registration, where the session invitation message carries the registration.
  • the BPF generates the L-iFC when the UE is registered, specifically, the BPF determines a destination L-TAS, and sets the determined destination L-TAS address to an L-iFC application.
  • Server AS address parameters, and determine the L-iFC service trigger event and corresponding logic.
  • the BPF further searches for registration information of the UE according to the calling number in the received session invitation message, and triggers third-party control according to the L-iFC in the registration information; the BPF matches the L The service trigger event of the -iFC and the corresponding logic, when matching, forward the session invitation message to the L-TAS address carried in the L-iFC.
  • the L-TAS saves the session information in the session invitation message after receiving the session invitation message; wherein the session information includes at least one of the following information: a calling user number, a called user number , session ID, and session media related information.
  • the L-TAS further initiates a session after triggering the CS service control success, and forwards the session information, and associates the newly initiated session with the previously received session.
  • the non-ICS enhanced network UE roams into the ICS enhanced network
  • the ICS enhanced network is not compatible with the existing mobile network, for the UE roaming to the ICS enhanced network, since the UE cannot implement the ICS enhancement
  • the registration of the network therefore, the UE will not be able to enjoy the communication services provided by the ICS enhanced network.
  • the present invention sets the BPF, and when the mAGCF receives the call setup request message of the UE of the non-ICS enhanced network, immediately determines the accessed BPF, and sends a session invitation message to the BPF; the BPF triggers the third-party service by using the L-iFC.
  • the UE accessing the non-ICS enhanced network by the ICS enhanced network is realized, and the communication service to the UE of the non-ICS enhanced network is realized.
  • the invention realizes the compatibility of the ICS enhanced network to the UE of the non-ICS enhanced network, and the IMS can also implement the service of the CS domain.
  • Figure 1 is an architectural diagram of the IMS centralized control service
  • Figure 2 is a schematic diagram of an ICS enhanced network architecture
  • Figure 3 is a flow chart of registration of ICS enhanced services
  • 4 is a schematic diagram of an ICS enhanced network architecture of the present invention
  • FIG. 5 is a flowchart of a conventional CS user roaming to an ICS enhanced network call initiation according to Embodiment 1 of the present invention
  • FIG. 6 is a flow chart of a traditional CS user roaming to an ICS enhanced network call initiation according to Embodiment 2 of the present invention
  • FIG. 7 is a flowchart of a conventional CS user roaming to an ICS enhanced network call origin according to Embodiment 3 of the present invention.
  • the basic idea of the present invention is that, after setting the BPF, the mAGCF immediately determines the accessed BPF after receiving the call setup request message of the UE of the non-ICS enhanced network, and sends a session invitation message to the BPF;
  • the third-party service control is triggered by the L-iFC, and the received session invitation message is forwarded to the L-TAS, and the L-TAS triggers the CS service control, and after the trigger is successful, acts as a proxy of the UE to establish a session with the peer. .
  • FIG. 4 is a schematic diagram of an ICS enhanced network architecture according to the present invention. As shown in FIG. 4, a BPF is added to the ICS enhanced network of the present invention compared with the existing ICS enhanced network. In addition, the present invention applies mAGCF, I to the ICS enhanced network.
  • the -CSCF, HSS, and L-TAS network elements have also been upgraded accordingly, enhancing the corresponding functions of these network elements, specifically:
  • the mAGCF is configured to: when the UE is attached, have the capability of sensing whether the current UE is another network user, and when the other network user is found to roam to the ICS enhanced network, select an appropriate BPF to send a registration request message;
  • the mAGCF After receiving the redirect request message of the I-CSCF, the mAGCF sends a registration message according to the redirected address in the message;
  • the mAGCF also has the capability of acquiring a Temporary Mobile Subscriber Identity (TMSI).
  • TMSI Temporary Mobile Subscriber Identity
  • the UE obtains the international mobile identity identifier IMSI of the UE, and the obtaining manner includes the following: the way:
  • the mAGCF acquires from the UE
  • the mAGCF can identify the TMSI, it is obtained according to the TMSI to the mAGCF to which the TMSI is allocated, or obtained by the MSC.
  • the I-CSCF is configured to: when the registration request message is received, have the capability of sensing whether the current UE is another network user. When the UE is found to roam the ICS enhanced network for the other network user, the I-CSCF notifies the mAGCF by using the redirect request message. Redirect to BPF or forward registration request message to BPF;
  • the HSS is configured to: when receiving the I-CSCF querying the user registration status message, determining that the current UE is another network user, returning the indication that the user is another network user;
  • the BPF has a protocol conversion capability. After receiving the registration request message, the registration information is saved, the PVI information of the UE in the registration request message is obtained, and the IMSI of the UE is obtained according to the PVI information of the UE, and the BPF adopts the MAP protocol. Sending a location update request message to the HLR to which the UE belongs, where the location update request message carries the IMSI information and the BPF address information of the UE;
  • the BPF is further configured to save the user data, and after receiving the insert user data request message, trigger the third party registration, and forward the obtained user subscription service data to the local telephone application server L-TAS;
  • the local initial filtering control iFC is generated, where the iFC includes the address of the L-TAS, and the service triggering standard;
  • the BPF also stores the registration address of the mAGCF.
  • the routing number is provided. After receiving the request message of the CS domain roaming number of the UE, the BPF allocates a routing number or obtains a routing number through the L-TAS. The BPF receives the call setup request, and routes the call to the L-TAS according to the L-iFC;
  • the L-TAS provides a routing number. After receiving the BPF to provide a roaming number request message, the L-TAS allocates a routing number.
  • the CS service control receives the session invitation message and triggers service control according to the contracted service.
  • the present invention is further described in detail based on how the ICS enhanced network supports traditional CS user roaming.
  • FIG. 5 is a flowchart of a conventional CS user roaming to an ICS enhanced network starting call according to Embodiment 1 of the present invention.
  • this embodiment describes that a conventional CS user roams to an ICS enhanced network, and the mAGCF receives a call setup of the UE.
  • the request message is sent to the BPF according to the BPF address bound to the registration, and the BPF forwards the session invitation message to the L-TAS according to the local L-iFC, and the L-TAS judges the CS service of the user's call.
  • the traditional CS user roaming to the ICS enhanced network call initiation process in this embodiment specifically includes the following steps:
  • Steps 501 to 502 the legacy UE (ie, the non-ICS enhanced network user) roams to the ICS enhanced network, and sends a call setup request message through the CS radio access network, where the call setup request message carries the international mobile subscriber identity of the UE.
  • IMSI International Mobile Subscriber Identification Number
  • Step 503 After receiving the UE call setup request message, the mAGCF associates the original user attachment information according to the user identity identifier IMSI in the call setup request message. If the UE does not reject the call, the UE is notified to attach, and the BPF is bound according to the attachment. Sending a session invitation message to the bound BPF, where the session invitation message carries information such as the called number and the calling number of the user;
  • Step 504 After receiving the session invitation message, the BPF associates with the calling party in the session invitation message to obtain the user registration information and the L-iFC generated during the registration, where the L-iFC generation may include the following: step: a.
  • the BPF selects a destination L-TAS according to the operation policy, and sets the selected destination L-TAS address to the AS address parameter in the L-iFC;
  • the BPF determines an L-iFC service trigger event and corresponding service logic, and triggers a message event received by the user to the L-TAS;
  • the BPF forwards the session to the L-TAS according to the address AS address information in the L-iFC, and the session carries the called number information and the calling number information of the user.
  • Step 505 The L-TAS searches for the CS subscription data obtained by the third-party registration of the user. After the search is successful, the received session is controlled according to the CS subscription data of the user, where the CS subscription data includes supplementary services before and after the user, and supplements. Business restrictions and operators' restricted services, etc.;
  • the L-TAS saves the session information in the session invitation message, where the session information includes at least one of the following information: the calling party number, the called user number, the session identifier, and the session media. Related information; after saving the session information, the L-TAS acts as a user agent, newly initiates a session, and forwards the received session information, and associates the newly initiated session with the previously received session;
  • Step 506 Step 507, L-TAS will be then forwarded to the BPF, BPF according to the session called number, routing the call to the called terminal R emo te;
  • Step 510 to step 511 the L-TAS returns the received 200 OK information to the mAGCF, and establishes a connection between the mAGCF and the remote IP medium.
  • Step 512 The mAGCF returns a call setup response message to the UE, and connects the media connection between the UE and the mAGCF, and the mAGCF also connects the media connection between the UE and the remote remote, so that the UE and the remote remote communicate normally.
  • FIG. 6 is a flowchart of a traditional CS user roaming to an ICS enhanced network call origin according to Embodiment 2 of the present invention. This embodiment describes that after a traditional CS user roams to an ICS enhanced network, the mAGCF receives a call setup request message of the UE, according to the registration time.
  • the bound BPF address, the session invitation message is sent to the BPF, and the BPF forwards the session invitation message to the L-TAS according to the local L-iFC, and the L-TAS rejects the call scenario.
  • the traditional CS user roams to the ICS enhanced network in this embodiment.
  • the call process specifically includes the following steps:
  • Steps 601 to 604 are the same as steps 501 to 504 shown in FIG.
  • Step 605 The L-TAS finds that there is no CS subscription data of the user, or finds that the user is restricted by the service contracted by the user, and the L-TAS returns a reject message, rejects the service, and sends a SIP reject message to the BPF, the SIP rejects
  • the message contains a rejection reason value
  • Step 606 The BPF returns a reject message to the forwarding mAGCF.
  • Step 607 The mAGCF returns a call reject message to the UE, where the call reject message carries a reject cause value brought from the network side.
  • FIG. 7 is a flowchart of a conventional CS user roaming to an ICS enhanced network call origin according to Embodiment 3 of the present invention.
  • the mAGCF receives the call setup request message of the UE, according to the registration.
  • the BPF address is bound to send a session invitation message to the BPF.
  • the BPF forwards the session invitation message to the L-TAS according to the L-iFC.
  • the L-TAS finds that there is no CS subscription data of the user, and obtains the user subscription data from the HLR to which the user belongs.
  • the traditional CS user roaming to the ICS enhanced network call initiation process in this embodiment specifically includes the following steps: Step 701 to step 704, which are the same as steps 501 to 504 shown in FIG. 5 above.
  • Step 705 After receiving the session invitation message, the L-TAS acquires the CS subscription data of the user. Specifically, the CS subscription data of the user may be obtained in the manner of step 705a described below, or step 705a may be performed after the L-TAS receives the session invitation message according to the main in the session invitation message.
  • the calling number does not find the CS subscription data of the user, and the L-TAS acquires the user data from the HLR of the user's home location according to the calling number of the user, and specifically sends a request message for acquiring the user data to the HLR of the user's home location.
  • the request message for acquiring the user data carries the user number; after receiving the request message for obtaining the user data, the HLR searches for the user CS subscription data according to the user number, and returns the user's subscription data to the L-TAS;
  • Step 705b The L-TAS sends a re-trigger third-party registration indication to the BPF.
  • Step 705c After receiving the third-party registration indication, the BPF determines whether the user saves the latest CS service data of the user. If not, the BPF sends a location update request message to the HLR of the user's home location to obtain the user data information.
  • Step 705d After receiving the user data returned by the HLR of the user's home location, the BPF sends a third-party registration message to the L-TAS, where the third-party registration message carries the user CS subscription data information.
  • Step 706 to step 713 which are the same as steps 505 to 512 shown in FIG. 5 above, the specific execution manner is as described above, and details are not described herein again.

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Description

用户漫游方法及 ICS增强网络 技术领域
本发明涉及在 IP多媒体子系统( IMS, IP Multimedia Subsystem ) 网络 架构中的漫游技术,尤其涉及一种基于 IMS集中业务(ICS, IMS Centralized Service ) 的用户漫游方法及 ICS增强网络。 背景技术
网络互联协议( IP, Internet Protocol )多媒体子系统( IMS, IP Multimedia Core Network Subsystem )是由第三代合作伙伴计划( 3GPP, 3rd Generation Partnership Project )提出的一种基于 IP的网络架构, 其构建了一个开放而 灵活的业务环境, 支持多媒体应用, 并为用户提供丰富的多媒体业务。
IMS 与接入技术无关, 除可以为通用分组无线业务(GPRS , General Packet Radio Service )、 无线局域网 ( WLAN, Wireless Local Area Network ) 等分组(PS, Packet Switching )接入网络提供业务外, 还可以为全球移动 通讯系统 ( GSM, Global System for Mobile communications ), 统用移动通 讯系统 ( UMTS, Universal Mobile Telecommunications System )等移动虫奪窝 网络提供业务。
GSM、 UMTS等移动网络采用电路交换技术, 称为电路(CS, Circuit Switched )域, 能够为用户提供基本的语音业务, 以及基于语音业务的补充 业务。 当 CS域接入 IMS时, 其演变为一种接入方式, 业务完全由 IMS统 一提供, 这种技术称为 IMS集中业务(ICS, IMS Centralized Service )0 图 1为 IMS集中控制业务的架构图, 如图 1所示, 该架构包括: 用户 设备(UE, User Equipment ) 101 , 全球移动通信系统无线接入网(UTRAN, Universal Mobile Telecommunication System Radio Access Network ) /GSM EDGE无线接入网(GERAN, GSM EDGE Radio Access Network ) 102, ICS 移动交换中服务器( ICS MSC Server, ICS Mobile Switch Center Server ) 103 , 电路域媒体网关( CS-MGW, CS Media Gateway )104,归属用户服务器( HSS, Home Subscriber Server ) 105, 呼叫会话控制功能实体( CSCF, Call Session Control Function )106和电话应用月良务器( TAS, Telephony Application Server ) 107; 其中,
UTRAN/ GERAN 102, 用于负责无线资源接入控制和管理;
ICS MSC Server 103 , 除了完成 CS用户设备的接入、 移动性管理、 呼 叫控制功能以外, 还充当会话初始协议 ( SIP, Session Initiation Protocol ) 用户代理, 实现 CS信令和 SIP消息之间的转换, 代替用户接入 IMS。
CS-MGW 104,用于负责提供媒体资源, 以及对媒体资源进行管理和控 制;
HSS 105, 用于保存用户的签约数据, 为呼叫或会话提供支持。
CSCF 106进一步分为查询 CSCF ( I-CSCF, Interrogating CSCF )和月良 务(S-CSCF, Serving CSCF )0 I-CSCF与 HSS进行交互, 请求 HSS为用户 分配 S-CSCF, 或查询用户所处的 S-CSCF; S-CSCF为用户提供注册、 呼叫 控制等功能。
TAS 107, 用于负责处理传统 CS域电话业务。
UE 101通过 CS控制信令接入到 ICS MSC Server 103 , ICS MSC Server 充当用户代理, 代替 CS用户设备 101接入 IMS网络的 CSCF 104, 并和远 端用户建立会话连接,同时 ICS MSC Server 103控制 CS-MGW 104完成 CS 承载上的媒体流和 IP承载上的媒体流之间的转换, 建立用户设备 101和远 端用户间的媒体连接。
从网络发展的角度来说, 核心网最终发展到由 IMS统一管理, 是被业 界认可的, 3GPP在版本 8中制定了 ICS技术, 通过 MSC Server增强将 CS 网络接入到 IMS网络, 这是一种 CS网络向 IMS网络演进的关键技术。 但 现有的 ICS技术并没有考虑到降低 ICS MSC成本, 现有的标准仅仅是在传 统的移动交换中心(MSC, Mobile Switch Center )基础上进行增强, 支持 ICS业务触发, 而实际上, 如果业务统一迁移到 IMS网络, 则 ICS MSC就 可以进行简化, 以降低核心网络成本。
为此, 业界提出一种 ICS增强网络架构, 以弱化 MSC Server功能, 与 传统 ICS相比,解决方案 CS网络彻底沉到接入层,这样网络结构比较简单, 不再依赖于 CS Core以及七号信令网。
图 2为 ICS增强网络架构示意图, 如图 2所示, 在图 1所示结构的基 础上, 包括以下新增网元:
移动接入网关控制功能实体( mAGCF, Mobile Access Gate Control Function ) 203, mAGCF203与 ICS MSC Server 104之间的区别点主要在于 mAGCF主要提供 CS和 SIP之间的信令转换, 不再具有传统 CS域 MSC Server对用户的接入管理和业务控制功能, 同时也取消了与传统 CS网络间 的接口, mAGCF203与传统 CS网络之间的互通通过 IMS网络的媒体网关 控制功能实体(MGCF, Media Gate Control Function ) 实现。
图 3为 ICS增强业务的注册流程图, 如图 3所示, UE通过 mAGCF接 入到 IMS网络, 在 IMS网络发起注册。 为了简明起见, 图 3中的流程, 重 点描述了 CS域的位置更新过程和 IMS注册过程, 而忽略了其中的安全认 证过程。
ICS增强注册过程包括以下步骤:
步骤 301〜步骤 302, UE在 CS接入网络发起 CS附着过程,向 ICS MSC Server发送 CS位置更新请求消息, 该 CS位置更新请求消息中携带 UE的 国际移动用户识别码 ( IMSI, International Mobile Subscriber Identification Number ); 步骤 303, ICS MSC Server将接收到的位置更新请求消息转换为 SIP注 册消息, 根据身份标识 IMSI获取用户归属域名, 向 UE归属域 IMS网络入 口网元 I-CSCF发送注册消息, 注册消息中携带由 ICS MSC Server根据 UE 的 IMSI推导出的私有用户标识( PVI, Private User Identity )。
步骤 304, I-CSCF收到注册消息, 向 HSS查询注册状态, 查询消息中 携带 UE的 PVI。 HSS根据 UE的 PVI查找当前 UE注册状态, 如果是重注 册, 则返回 UE以注册的 S-CSCF地址, 如果是首次注册, HSS选择一个 S-CSCF地址或者返回一个 S-CSCF能力列表;
步骤 305,如果 HSS返回的是 S-CSCF地址信息,则 I-CSCF向该 S-CSCF 转发注册请求消息, 如果 HSS返回的 S-CSCF能力列表, 则 I-CSCF选择一 个能力符合的 S-CSCF, 并向它转发注册请求消息;
步骤 306, S-CSCF接收到注册请求消息, 可能会触发鉴权流程, 为简 明起见, 这里暂不过多描述;
步骤 307, S-CSCF向 HSS获取用户业务签约数据;
步骤 308, S-CSCF向 mAGCF返回注册成功消息, 该注册成功消息中 携带有 UE的可用的公有用户标识( PUI, Public User Identity )列表和缺省 PUI;
步骤 309, mAGCF保存 S-CFCF地址和用户标识列表和缺省 PUI, 并 向 UE返回位置更新成功消息;
在 ICS增强技术中, MSC功能被弱化, 不再具有业务处理功能, 仅负 责协议转换和资源管理工作,业务触发和控制都集中到归属 IMS核心网络, 而对于传统 CS网络漫游机制,业务控制和触发由拜访地 MSC处理,这样, 按照现有的 ICS增强技术,导致传统用户漫游到前述的 ICS增强网络中时, 无法触发业务。 发明内容
有鉴于此, 本发明的主要目的在于提供一种用户漫游方法及 ICS增强 网络, 能实现 ICS增强网络对其他移动网络用户的通信业务兼容。
为达到上述目的, 本发明的技术方案是这样实现的:
一种用户漫游方法, 在 ICS增强网络中增设边际代理功能网元( BPF, Bounds Proxy Function ); 所述方法包括:
mAGCF接收到非 ICS增强网络的 UE的呼叫建立请求消息后, 向边际 代理功能网元 BPF发送会话邀请消息;
所述 BPF通过本地初始过滤控制 (L-iFC, Local Initial Filter Control ) 触发第三方业务控制, 并将所接收的会话邀请消息转发给本地电话应用服 务器 ( L-TAS , Local Telephony Application Server );
所述 L-TAS 接收到会话邀请消息后, 触发电路交换 (CS, Circuit Switching )域业务控制, 并在触发成功后作为所述 UE的代理, 建立与对端 的会话。
优选地, 所述 mAGCF向 BPF发送会话邀请消息前, 还包括: 所述 mAGCF确定所述 UE是否已注册,若已注册则向注册时所获取的 BPF地址发送会话邀请消息, 所述会话邀请消息中携带注册时获取的所述 UE的移动用户国际号码( MSISDN, Mobile Subscriber International ISDN ) 信息; 若未注册则拒绝呼叫。
优选地, 所述方法还包括:
所述 BPF在所述 UE注册时生成所述 L-iFC。
优选地, 所述 BPF生成所述 L-iFC为:
所述 BPF确定目的 L-TAS, 将所确定的目的 L-TAS地址设置为 L-iFC 中应用服务器(AS, Application Server )地址参数, 并确定 L-iFC业务触发 事件和相应逻辑。 优选地, 所述 BPF通过本地初始过滤控制为:
所述 BPF根据所接收的会话邀请消息中的主叫号码查找所述 UE的注 册信息, 并根据所述注册信息中的 L-iFC触发第三方控制;
所述 BPF匹配所述 L-iFC的业务触发事件和相应逻辑,匹配时向 L-iFC 中携带的 L-TAS地址转发会话邀请消息。
优选地, 所述方法还包括:
所述 L-TAS接收到会话邀请消息后, 保存所述会话邀请消息中的会话 信息; 所述会话信息包括以下信息的至少一种: 主叫用户号码、 被叫用户 号码、 会话标识、 会话媒体相关信息。
优选地, 所述 L-TAS作为所述 UE的代理, 建立到对端的会话具体为: 所述 L-TAS新发起会话, 并转发所述会话信息, 将新发起的会话与之 前接收到的会话进行关联。
一种 ICS增强网络, 包括 mAGCF、 BPF和 L-TAS; 其中,
mAGCF,用于在接收到非 ICS增强网络的 UE的呼叫建立请求消息后, 向 BPF发送会话邀请消息;
BPF, 用于通过 L-iFC触发第三方业务控制, 并将所接收的会话邀请消 息转发给 L-TAS;
L-TAS, 用于接收的会话邀请消息后, 触发 CS业务控制, 并在触发成 功后作为所述 UE的代理, 建立与对端的会话。
优选地, 所述 mAGCF向 BPF发送会话邀请消息前, 进一步确定所述 UE是否已注册, 若已注册则向注册时所获取的 BPF地址发送会话邀请消 息, 其中, 所述会话邀请消息中携带注册时获取的所述 UE的 MSISDN信 息; 若未注册则拒绝呼叫。
优选地, 所述 BPF在所述 UE注册时, 生成所述 L-iFC, 具体地, 所述 BPF确定目的 L-TAS, 将所确定的目的 L-TAS地址设置为 L-iFC中应用月良 务器 AS地址参数, 并确定 L-iFC业务触发事件和相应逻辑。
优选地, 所述 BPF进一步根据所接收的会话邀请消息中的主叫号码查 找所述 UE的注册信息, 并根据所述注册信息中的 L-iFC触发第三方控制; 所述 BPF匹配所述 L-iFC的业务触发事件和相应逻辑,匹配时向 L-iFC 中携带的 L-TAS地址转发会话邀请消息。
优选地, 所述 L-TAS在接收到会话邀请消息后, 保存所述会话邀请消 息中的会话信息; 其中, 所述会话信息包括以下信息的至少一种: 主叫用 户号码、 被叫用户号码、 会话标识、 会话媒体相关信息。
优选地, 所述 L-TAS进一步在触发 CS业务控制成功后, 新发起会话, 并转发所述会话信息, 将新发起的会话与之前接收到的会话进行关联。
本发明中, 当非 ICS增强网络 UE漫游到 ICS增强网络中时, 由于 ICS 增强网络与现有的移动网络并不兼容, 因此, 对于漫游到 ICS增强网络的 UE,由于 UE不能实现到 ICS增强网络的注册,因此, UE也就不能享受 ICS 增强网络提供的通信服务。本发明通过设置 BPF, 当 mAGCF接收到非 ICS 增强网络的 UE的呼叫建立请求消息后,立即确定接入的 BPF,并向该 BPF 发送会话邀请消息; 所述 BPF通过 L-iFC触发第三方业务控制, 并将所接 收的会话邀请消息转发给 L-TAS, 由 L-TAS触发 CS业务控制, 并在触发 成功后作为所述 UE的代理, 建立与对端的会话。 这样, 即实现由 ICS增强 网络接入非 ICS增强网络的 UE,实现对非 ICS增强网络的 UE的通信服务。 本发明实现了 ICS增强网络对非 ICS增强网络的 UE的兼容, 基于 IMS也 能实现 CS域的业务。 附图说明
图 1为 IMS集中控制业务的架构图;
图 2为 ICS增强网络架构示意图;
图 3为 ICS增强业务的注册流程图; 图 4为本发明 ICS增强网络架构示意图;
图 5为本发明实施例一的传统 CS用户漫游到 ICS增强网络起呼流程 图;
图 6为本发明实施例二的传统 CS用户漫游到 ICS增强网络起呼流程 图;
图 7为本发明实施例三的传统 CS用户漫游到 ICS增强网络起呼流程 图。 具体实施方式 本发明的基本思想是, 通过设置 BPF, 当 mAGCF接收到非 ICS增强 网络的 UE的呼叫建立请求消息后, 立即确定接入的 BPF, 并向该 BPF发 送会话邀请消息; 所述 BPF通过 L-iFC触发第三方业务控制, 并将所接收 的会话邀请消息转发给 L-TAS, 由 L-TAS触发 CS业务控制, 并在触发成 功后作为所述 UE的代理, 建立与对端的会话。
为使本发明的目的、 技术方案和优点更加清楚明白, 以下举实施例并 参照附图, 对本发明进一步详细说明。
图 4为本发明 ICS增强网络架构示意图, 如图 4所示, 与现有 ICS增 强网络相比, 本发明的 ICS增强网络新增了一个 BPF, 另外, 本发明对 ICS 增强网络中 mAGCF、 I-CSCF、 HSS以及 L-TAS网元还进行了相应升级, 增强了这些网元的相应功能, 具体为:
mAGCF, 用于在 UE附着时, 具备感知当前 UE是否是其他网络用户 的能力, 当发现他网用户漫游到 ICS增强网络时, 选择合适的 BPF发送注 册请求消息;
mAGCF在接收到 I-CSCF的改向请求消息后, 根据消息中改向地址发 送注册消息; mAGCF还具备获取临时识别码(TMSI, Temporary Mobile Subscriber Identity ) 的能力, 当 mAGCF所接收到位置更新请求消息中携带的是临时 身份用户标识时, 获取 UE的国际移动身份标识 IMSI, 获取方式包括如下 方式:
a, mAGCF向所述 UE获取;
b, 或者 mAGCF如果能识别出所述 TMSI, 则根据所述 TMSI向分配 TMSI的 mAGCF获取, 或者通过 MSC获取。
I-CSCF, 用于在接收到注册请求消息时, 具备感知当前 UE是否是其 他网络用户的能力,当发现 UE为他网用户漫游到 ICS增强网络时, I - CSCF 通过改向请求消息通知 mAGCF改向到 BPF或者转发注册请求消息到 BPF;
HSS, 用于接收到 I-CSCF查询用户注册状态消息时, 判断当前 UE为 其他网络用户时, 返回用户为其他网络用户的指示;
BPF, 具有协议转换能力, 在接收到注册请求消息后, 保存注册信息, 获取注册请求消息中的 UE的 PVI信息, 并根据 UE的 PVI信息获取所述 UE的 IMSI, 所述 BPF采用 MAP协议, 向所述 UE所属的 HLR发送位置 更新请求消息,位置更新请求消息中携带 UE的 IMSI信息和 BPF地址信息;
BPF还用于保存用户数据, 在接收到所述插入用户数据请求消息后, 触发第三方注册, 将所获取的用户签约业务数据转发给本地电话应用服务 器 L-TAS;
BPF触发第三方注册的前, 生成本地初始过滤控制 iFC, 所述 iFC中包 含 L-TAS的地址, 业务触发标准;
BPF还保存 mAGCF的注册地址; 提供路由号码, 在接收到 UE的 CS 域漫游号码提供请求消息后, BPF分配路由号码或者通过 L-TAS获取路由 号码; BPF接收到呼叫建立请求, 根据 L-iFC, 将呼叫路由到 L-TAS;
L-TAS,提供路由号码,当接收到 BPF提供漫游号码请求消息后, L-TAS 分配路由号码;
CS业务控制, 接收到会话邀请消息, 根据签约的业务触发业务控制。 以下结合上述网络结构, 进一步详细介绍本发明基于 ICS增强网络是 如何支持传统 CS用户漫游的。
图 5为本发明实施例一的传统 CS用户漫游到 ICS增强网络起呼流程 图, 如图 5所示, 本实施例描述了传统 CS用户漫游到 ICS增强网络后, mAGCF收到 UE的呼叫建立请求消息, 根据注册时绑定的 BPF地址, 向 BPF发送会话邀请消息, BPF根据本地的 L-iFC向 L-TAS转发会话邀请消 息, L-TAS对用户的呼叫进行 CS业务判断。 本实施例的传统 CS用户漫游 到 ICS增强网络起呼流程具体包括以下步骤:
步骤 501〜步骤 502, 传统 UE (即非 ICS增强网络用户 )漫游到 ICS增 强网络, 通过 CS无线接入网络发送呼叫建立请求消息, 其中, 呼叫建立请 求消息中携带有 UE 的国际移动用户识别码 ( IMSI, International Mobile Subscriber Identification Number )信息和被叫号码信息;
步骤 503, mAGCF接收到 UE呼叫建立请求消息后, 根据呼叫建立请 求消息中用户身份标识 IMSI关联原来用户附着信息, 如果没有拒绝 UE的 呼叫, 则通知 UE进行附着, 并根据附着时绑定的 BPF信息, 向该绑定的 BPF发送会话邀请消息, 该会话邀请消息中携带有被叫号码和用户的主叫 号码等信息;
步骤 504, BPF接收到会话邀请消息后,根据会话邀请消息中的主叫号 码关联到原用户注册的数据区, 获取用户注册信息和注册时产生的 L-iFC, 其中 L-iFC生成可以包含如下步骤: a. BPF根据运营策略选择一个目的 L-TAS, 将所选择的目的 L-TAS地 址设置为 L-iFC中 AS地址参数;
b. 所述 BPF确定 L-iFC业务触发事件和相应的业务逻辑, 并将接收到 该用户的消息事件均触发到 L-TAS;
BPF根据 L-iFC中的地址 AS地址信息, 将会话转发到 L-TAS, 会话中 携带被叫号码信息和用户主叫号码信息;
步骤 505, L-TAS查找所述用户第三方注册获取的 CS签约数据, 查找 成功后, 对接收到的会话根据用户的 CS签约数据进行业务控制, 其中 CS 签约数据包括用户前后的补充业务、 补充业务限制以及运营商限制类业务 等等;
如果用户当前业务满足签约数据业务要求, L-TAS 将保存会话邀请消 息中的会话信息, 其中的会话信息包括以下信息的至少一种: 主叫用户号 码、 被叫用户号码、 会话标识、 会话媒体相关信息等; 保存完会话信息后, L-TAS作为用户代理, 新发起一个会话, 并转发所接收到的会话信息, 将 新发起的会话与之前接收到的会话进行关联;
步骤 506〜步骤 507, L-TAS将会话转发给 BPF, BPF根据会话中的被 叫号码, 将呼叫路由到被叫 Remote端; 步骤 508〜步骤 509,远端 Remote接收到会话邀请消息,接受会话邀请, 返回 200 OK消息指示接受会话, 会话中携带 Remote端媒体信息;
步骤 510〜步骤 511, L-TAS将接收到的 200 OK信息返回给 mAGCF, 建立 mAGCF与远端的 IP媒体连接;
步骤 512, mAGCF向 UE返回呼叫建立应答消息,接通 UE与 mAGCF 之间的媒体连接, mAGCF同时也接通 UE与远端 Remote之间的媒体连接, 从而使 UE和远端 Remote之间正常通信。 图 6为本发明实施例二的传统 CS用户漫游到 ICS增强网络起呼流程 图, 本实施例描述了传统 CS用户漫游到 ICS增强网络后, mAGCF接收到 UE的呼叫建立请求消息, 根据注册时绑定的 BPF地址, 向 BPF发送会话 邀请消息, BPF根据本地的 L-iFC向 L-TAS转发会话邀请消息, L-TAS拒 绝呼叫的场景,本实施例的传统 CS用户漫游到 ICS增强网络起呼流程具体 包括以下步骤:
步骤 601〜步骤 604, 同前述图 5所示的步骤 501〜步骤 504。
步骤 605, L-TAS发现没有该用户 CS签约数据, 或者发现该用户被其 自身所签约的业务所限制, L-TAS返回拒绝消息, 拒绝这次业务, 向 BPF 发送 SIP拒绝消息, 该 SIP拒绝消消息中携带有拒绝原因值;
步骤 606, BPF向转发 mAGCF返回拒绝消息;
步骤 607, mAGCF向 UE返回呼叫拒绝消息, 该呼叫拒绝消息中携带 从网络侧带来的拒绝原因值。
图 7为本发明实施例三的传统 CS用户漫游到 ICS增强网络起呼流程 图, 本实施例描述了传统 CS用户漫游到 ICS增强网络时, mAGCF接收到 UE的呼叫建立请求消息后, 根据注册时绑定的 BPF地址, 向 BPF发送会 话邀请消息, BPF根据 L-iFC向 L-TAS转发会话邀请消息, L-TAS发现没 有该用户的 CS签约数据, 向用户归属的 HLR获取用户签约数据的场景。 本实施例的传统 CS用户漫游到 ICS增强网络起呼流程具体包括以下步骤: 步骤 701〜步骤 704, 同前述图 5所示的步骤 501〜步骤 504。
步骤 705, L-TAS接收到会话邀请消息后, 获取用户的 CS签约数据。 具体的, 可按照下述的步骤 705a的方式获取用户的 CS签约数据, 也可以 步骤 705a, L-TAS接收到会话邀请消息后, 根据会话邀请消息中的主 叫号码, 没有查找到该用户的 CS签约数据, L-TAS根据用户主叫号码, 向 用户归属地的 HLR获取用户数据, 具体的, 向用户归属地的 HLR发送获 取用户数据的请求消息, 该获取用户数据的请求消息中携带有用户号码; HLR接收到获取用户数据的请求消息后, 根据用户号码查找用户 CS签约 数据, 并将用户的签约数据返回给 L-TAS;
步骤 705b, L-TAS向 BPF发送重新触发第三方注册指示;
步骤 705c, BPF接收到第三方注册指示后, 判断本地是否保存用户最 新的 CS业务数据, 如果没有, 则 BPF向用户归属地的 HLR发送位置更新 请求消息, 获取用户数据信息;
步骤 705d, BPF接收到用户归属地的 HLR返回的用户数据后,向 L-TAS 发送第三方注册消息, 该第三方注册消息中携带用户 CS签约数据信息。
步骤 706〜步骤 713, 同前述图 5中所示的步骤 505〜步骤 512, 具体执 行方式参见前文所述, 这里不再赘述。
以上所述, 仅为本发明的较佳实施例而已, 并非用于限定本发明的保 护范围。

Claims

权利要求书
1、 一种用户漫游方法, 其特征在于, 在 IMS集中业务 ICS增强网络中 增设边际代理功能网元 BPF; 所述方法包括:
移动接入网关控制功能实体 mAGCF接收到非 ICS增强网络的用户设 备 UE的呼叫建立请求消息后, 向 BPF发送会话邀请消息;
所述 BPF通过本地初始过滤控制 L-iFC触发第三方业务控制, 并将所 接收的会话邀请消息转发给本地电话应用服务器 L-TAS;
所述 L-TAS接收到会话邀请消息后, 触发电路交换域 CS业务控制, 并在触发成功后作为所述 UE的代理, 建立与对端的会话。
2、 根据权利要求 1所述的方法, 其特征在于, 所述 mAGCF向 BPF发 送会话邀请消息前, 还包括:
所述 mAGCF确定所述 UE是否已注册,若已注册则向注册时所获取的 BPF地址发送会话邀请消息, 所述会话邀请消息中携带注册时获取的所述 UE的移动用户国际号码 MSISDN信息; 若未注册则拒绝呼叫。
3、 根据权利要求 1所述的方法, 其特征在于, 所述方法还包括: 所述 BPF在所述 UE注册时生成所述 L-iFC。
4、根据权利要求 3所述的方法,其特征在于,所述 BPF生成所述 L-iFC 为:
所述 BPF确定目的 L-TAS, 将所确定的目的 L-TAS地址设置为 L-iFC 中应用服务器 AS地址参数, 并确定 L-iFC业务触发事件和相应逻辑。
5、 根据权利要求 3所述的方法, 其特征在于, 所述 BPF通过本地初始 过滤控制为:
所述 BPF根据所接收的会话邀请消息中的主叫号码查找所述 UE的注 册信息, 并根据所述注册信息中的 L-iFC触发第三方控制;
所述 BPF匹配所述 L-iFC的业务触发事件和相应逻辑,匹配时向 L-iFC 中携带的 L-TAS地址转发会话邀请消息。
6、 根据权利要求 1所述的方法, 其特征在于, 所述方法还包括: 所述 L-TAS接收到会话邀请消息后, 保存所述会话邀请消息中的会话 信息; 所述会话信息包括以下信息的至少一种: 主叫用户号码、 被叫用户 号码、 会话标识、 会话媒体相关信息。
7、 根据权利要求 6所述的方法, 其特征在于, 所述 L-TAS作为所述 UE的代理, 建立到对端的会话为:
所述 L-TAS新发起会话, 并转发所述会话信息, 将新发起的会话与之 前接收到的会话进行关联。
8、 一种 ICS增强网络, 其特征在于, 所述 ICS增强网络包括 mAGCF、 BPF和 L-TAS; 其中,
mAGCF,用于在接收到非 ICS增强网络的 UE的呼叫建立请求消息后, 向 BPF发送会话邀请消息;
BPF, 用于通过 L-iFC触发第三方业务控制, 并将所接收的会话邀请消 息转发给 L-TAS;
L-TAS, 用于接收的会话邀请消息后, 触发 CS业务控制, 并在触发成 功后作为所述 UE的代理, 建立与对端的会话。
9、 根据权利要求 8所述的 ICS增强网络, 其特征在于, 所述 mAGCF 向 BPF发送会话邀请消息前, 进一步确定所述 UE是否已注册, 若已注册 则向注册时所获取的 BPF地址发送会话邀请消息, 其中, 所述会话邀请消 息中携带注册时获取的所述 UE的 MSISDN信息; 若未注册则拒绝呼叫。
10、 根据权利要求 8所述的 ICS增强网络, 其特征在于, 所述 BPF在 所述 UE注册时, 生成所述 L-iFC, 具体地, 所述 BPF确定目的 L-TAS, 将 所确定的目的 L-TAS地址设置为 L-iFC中应用服务器 AS地址参数, 并确 定 L-iFC业务触发事件和相应逻辑。
11、 根据权利要求 10所述的 ICS增强网络, 其特征在于, 所述 BPF进 一步根据所接收的会话邀请消息中的主叫号码查找所述 UE的注册信息,并 根据所述注册信息中的 L-iFC触发第三方控制;
所述 BPF匹配所述 L-iFC的业务触发事件和相应逻辑,匹配时向 L-iFC 中携带的 L-TAS地址转发会话邀请消息。
12、 根据权利要求 8所述的 ICS增强网络, 其特征在于, 所述 L-TAS 在接收到会话邀请消息后, 保存所述会话邀请消息中的会话信息; 其中, 所述会话信息包括以下信息的至少一种: 主叫用户号码、 被叫用户号码、 会话标识、 会话媒体相关信息。
13、 根据权利要求 12所述的 ICS增强网络, 其特征在于, 所述 L-TAS 进一步在触发 CS业务控制成功后, 新发起会话, 并转发所述会话信息, 将 新发起的会话与之前接收到的会话进行关联。
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