WO2007079687A1 - Procédé, dispositif ou système réseau pour la sélection d'un réseau de jonction appelé - Google Patents

Procédé, dispositif ou système réseau pour la sélection d'un réseau de jonction appelé Download PDF

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Publication number
WO2007079687A1
WO2007079687A1 PCT/CN2007/000096 CN2007000096W WO2007079687A1 WO 2007079687 A1 WO2007079687 A1 WO 2007079687A1 CN 2007000096 W CN2007000096 W CN 2007000096W WO 2007079687 A1 WO2007079687 A1 WO 2007079687A1
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WIPO (PCT)
Prior art keywords
entity
network
ims
network selection
selection decision
Prior art date
Application number
PCT/CN2007/000096
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English (en)
French (fr)
Inventor
Dongming Zhu
Xiaoqin Duan
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to EP07702028A priority Critical patent/EP1959622B1/en
Priority to AT07702028T priority patent/ATE550899T1/de
Publication of WO2007079687A1 publication Critical patent/WO2007079687A1/zh
Priority to US12/167,522 priority patent/US8311034B2/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/66—Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
    • 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
    • H04L65/1066—Session management
    • H04L65/1069—Session establishment or de-establishment
    • 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
    • H04L65/1066—Session management
    • H04L65/1083—In-session procedures
    • H04L65/1095—Inter-network session transfer or sharing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service
    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/08—Upper layer protocols
    • H04W80/10—Upper layer protocols adapted for application session management, e.g. SIP [Session Initiation Protocol]

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method, device, and network system for selecting a called connection network. Background technique
  • the Universal Mobile Telecommunications System (UMTS) core network is divided into three subsystems: Circuit Switched Domain (CS) domain, Packet Switched Domain (PS) domain, and IP Multimedia Subsystem (IMS) domain. .
  • CS Circuit Switched Domain
  • PS Packet Switched Domain
  • IMS IP Multimedia Subsystem
  • the CS domain is used to provide users with connections for circuit-type services, including:
  • Mobile Switching Center MSC (MSC Server/CS-MGW): Completes the switching and signaling control functions of circuit-switched services.
  • Gateway Mobile Switching Center GMSC An MSC that completes the mobile subscriber routing function in a network can be set up or separated from the MSC.
  • Network interworking function IWF Closely related to the MSC, complete interworking between the PLMN network and the ISDN, PSTN, and PDN networks (mainly complete the signaling conversion function;), and the specific functions have different regulations depending on the service and network type.
  • the Packet Switched Domain is used to provide a connection for a packet type service to a user, including: a General Packet Radio Service (GPRS) support node GSN (SGSN, GGSN): completes the transmission of a packet of a packet service user.
  • GPRS General Packet Radio Service
  • the service GSN (SGSN) provides the connection between the core network and the wireless access systems BSS and RNS, completes the mobility management and session management functions of the packet data service, manages the mobile and communication services of the MS in the mobile network, and the gateway GSN (GGSN) As an interface between the mobile communication system and other public data networks, it also has the function of querying location information.
  • GPRS General Packet Radio Service
  • Both SGSN and GGSN provide charging information.
  • Edge Gateway BG Completes the interworking between the two GPRS networks to ensure the security of network interworking.
  • functional entities shared by the CS domain and the PS domain include:
  • HLR7 Authentication Center AuC HLR completes user subscription data (MSISDN, IMSI, PDP ADDRESS, contracted telecommunication service and supplementary service and its service scope, etc.) and location information (MSC/VLR number, SGSN number, GMLC, etc.) are managed, and AuC stores the user's authentication algorithm and key.
  • Others include a visitor location register VLR that handles various data information of the visited user, a device identification register EIR that stores user equipment identification IMEI information, and a short message center gateway MSC (SMS-GMSC/SMS IMSC).
  • VLR visitor location register
  • EIR device identification register
  • IMSC short message center gateway MSC
  • IMS IP Multimedia Subsystem
  • the packet domain is used as the bearer channel for the upper layer control signaling and media transmission, and the session initiation protocol SIP is introduced.
  • SIP Session initiation protocol
  • As a service control protocol the protocol provides a rich multimedia service by separating the service control from the bearer control by using the characteristics of simple SIP, easy to expand, and convenient media combination.
  • the main functional entities in the IMS include functions such as controlling user registration and session control.
  • a call session control function entity CSCF an application server AS providing various service logic control functions
  • a home subscriber server HSS centrally managing user subscription data
  • a media gateway control function MGCF/IMS media gateway IM for implementing interworking with the circuit switched network -MGW.
  • the user accesses the IMS through the current location proxy node proxy call session control function entity P-CSCF, and the session and service trigger control and the service control interaction with the AS are served by the home domain service node of the home location to call the session control function entity S-CSCF.
  • the HSS in the IMS system is a superset of the HLR, and is functionally compatible with the HLR. However, due to factors such as the network construction process, the HSS and the CS/PS HLR in the specific networking may also be separated.
  • the IMS architecture defined by the 3GPP standard comprehensively solves the key operational problems such as roaming charging, quality of service QoS, and security assurance required to provide multimedia services under IP bearers.
  • the architecture and ideas have been recognized in the industry, 3GPP2, TISPAN.
  • the 3GPP model is used as the basis and reference for the definition of the corresponding IP multimedia network architecture and service system.
  • 3GPP has also started UMTS interworking (I-WLAN) and fixed broadband access IMS for wireless LAN WLA access and universal mobile communication systems. (FBI) and research on all-IP networks (AIPN) for multiple access technologies, users will be able to access via different access technologies through a single multimode terminal or multiple types of different terminals according to their subscriptions.
  • the network accesses the IMS to obtain unified multimedia services, including VoIP services;
  • 3GPP which is responsible for studying GSM and WCDMA system standards
  • 3GPP2 which is responsible for studying CDMA and CDMA2000 system standards
  • the work of the continuity problem proposes to solve the problem of CS/IMS inter-connected network selection between CS/IMS inter-domain when the user acts as the called party, and CS-IMS handover due to terminal mobility.
  • the voice service continuity problem requires that the following network selection factors be used to make a comprehensive judgment to determine the called connection network, thereby providing a better business experience, such as Ensure a higher success rate to the called user, choose a way to provide a higher quality or lower tariff, and so on.
  • Relevant factors related to these network selections include: User registration status in CS/IMS, service, subscription data or operator and network selection policy/preference set by the user, whether there is currently a call situation in a certain domain, and The ability to enter the IMS IP access network.
  • CS-IMS bidirectional handover scheme that is statically anchored to IMS and centrally controlled by IMS has been selected.
  • the basic idea is that the IMS belongs to the user.
  • the domain assigns an application server AS as a call continuity control function (CCCF), and sends all control signaling related to the user's circuit domain call and IMS domain session to the application server for anchoring, by the CCCF
  • CCCF call continuity control function
  • the third-party control mode controls the call connection between the switching user and the peer user, and completes the cross-domain switching according to the user request control.
  • FIG. 1A the call connection between the switching user and the peer user is divided into two segments on the application server.
  • the switching user When the user needs to perform cross-domain handover, the switching user re-establishes the application to the application in the switched network domain.
  • the application server controls the renegotiation on the connection of the user to the peer user, so that the peer user and the switching user perform voice interaction on the new connection.
  • the CCCF control completes the replacement (migration) of the two sessions between the VCC users.
  • the called service will always be routed first to its IMS domain.
  • IMS-NeDS network connection decision function
  • the voice service continuity topic is only for the voice service, in fact, in addition to the VoIP service, the IMS domain can provide users with extremely rich multimedia services, that is, the IMS service capability is greatly enriched in the CS domain.
  • a service request directed to a voice continuity service subscriber in the IMS domain such as an IMS session request for multimedia interaction, may not be suitable for direct transfer to a CS domain connection subscriber. Therefore, direct transfer of the service request to the CS domain without considering the type of the service request may result in a decrease in the quality of the provided multimedia service, or even a failure to provide the required multimedia service, thereby causing the service to fail.
  • the called network connection decision function selected by the called network connection decision function does not only include the CS domain and the IMS domain, but also is collectively referred to as a circuit switched network together with the CS domain.
  • the PSTN network and the ISDN network whose service capabilities are also significantly different from those of the IMS domain (for the sake of simplicity, the CS domain and the PSTN network and the ISDN network in the GSM, CDMA, WCDMA, and CDMA2000 systems are collectively referred to as circuit-switched networks).
  • connection network selection decision function it is not limited to voice services, but should fully consider the rich multimedia services of the IMS domain, and the IMS domain and Different business capabilities of circuit-switched networks, avoiding directing them regardless of the type of service request Go to the circuit switched network may result in reduced quality of multimedia services provided, not even required to provide multimedia services thus resulting in service failure situation.
  • Embodiments of the present invention provide a method, apparatus, and network system for selecting a called connection network to avoid direct transfer of service requests to a circuit switched network and affect service provisioning problems.
  • a method for selecting a called connection network includes the following steps:
  • IMS IP Multimedia Subsystem
  • a communication device comprising:
  • a communication device comprising:
  • a network system including:
  • a network selection decision entity configured to perform a network connection selection decision according to a network selection related factor when the network selection decision query entity queries
  • a network selection decision query entity connected to the network selection decision entity, configured to perform service type determination when receiving an IMS service request directed to the served user, and determining that the service request is suitable to be connected to the circuit according to the service type
  • the network selection decision entity queries the current called connection network selection decision, and then requests the IMS service according to the decision.
  • a network system including:
  • the network selection decision query entity is configured to, after receiving the IMS service request directed to the served user, query the network selection decision entity to query the current called connection network selection decision, and perform subsequent connection processing on the IMS service request according to the decision;
  • a network selection decision entity configured to connect with the network selection decision query entity, to determine a current called connection network selection decision according to at least the service type of the IMS service request, and provide the network selection decision query entity to the network selection decision query entity.
  • the circuit switching network is considered according to various network selection related factors.
  • the called network connection between the IMS and the IMS domain enables not only the flexible network connection function of the called party, but also the different networks and terminals. The ability to provide better service experience for the user and realize network resources for the operator. For efficient use, it can be guaranteed that the quality of service when determining that the called network is a circuit switched network will not be lost due to the difference in network capabilities between the IMS and the circuit switched network. The use of the present invention can further improve the user's business experience.
  • 1A is a schematic diagram of implementing voice service continuity in an existing communication system
  • FIG. 1B is a schematic diagram of a connection network selection of a called party in an IMS in the prior art
  • FIG. 2A and FIG. 2B are schematic diagrams of an IMS network system according to an embodiment of the present invention
  • FIG. 4, FIG. 5, and FIG. 6 are flow diagrams showing the selection of the connected network in the embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a network selection decision query entity according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a network selection decision entity according to an embodiment of the present invention. detailed description
  • the network service capability difference affects the normal provision of the service.
  • the network selection decision query entity interacts with the network selection decision entity to determine the called network selection, it is determined according to the type of the service request.
  • the service request is transferred to the circuit switched network for connection, thereby determining the called connection network selection process. Suitable for transfer to circuit switched networks
  • the IMS service request further determines the called network connection decision decision according to various network selection related factors, and performs subsequent connection processing according to the current network selection decision; for the IMS service request that is not suitable for handover to the circuit switched network, The called network selection decision query interaction is performed, or the network selection decision entity directly decides to connect the service request in the IMS domain.
  • the service type of the IMS service request may be determined according to the method name of the IMS service request and/or the session description protocol SDP description carried therein, or may be determined according to a specific service identifier in the service request message; determining whether it is suitable for the handover to the circuit according to the service type.
  • the judgment of the switching network may be directly based on the method name of the IMS service request and/or the session description protocol SDP description carried therein, or the specific service identifier in the service request message, or may be based on the method name and/or carried in the IMS service request.
  • the session description protocol SDP description, or the service type indication determined by the specific service identifier in the service request message is completed.
  • Determining that the service request is suitable if it is determined that the service request is used to establish a voice interaction of VoIP, or for establishing a video interaction that can be converted into a circuit switched video service, or for establishing a multimedia interaction including a VoIP voice component. Transfer to the circuit-switched network for connection, otherwise, determine that the service request is not suitable for handover to the circuit-switched network for connection.
  • the operator may assign different user identifiers to different services of the user, for example, assigning a dedicated user identifier to a service suitable for handover to the circuit switched network connection, so that the above service type judgment may also be based on the service request. Determining the destination identifier, when the destination identifier in the service request is a dedicated user identifier in the network for the user to be transferred to the circuit switched network connection service, determining that the service request is suitable for handover to the circuit switched network for connection Otherwise, it is determined that the service request is not suitable for handover to the circuit switched network for connection.
  • the network selection decision query entity can determine whether it is appropriate to transfer the currently processed IMS service request to the circuit switched network for the called connection. If the network selection decision query entity determines that the result is yes, the network selection decision entity further queries the current network selection decision, and performs subsequent connection processing according to the decision; if the determination result is no, the current called connection network selection decision is not performed. The inquiry is directly connected to the IMS in accordance with the standard regulations.
  • the network selection decision entity may also determine whether it is suitable to transfer the currently processed IMS service request to the circuit switched network when receiving the query request of the network selection decision query entity. Called to continue. If the determination result is yes, the network selection decision judgment process is further performed according to various network selection related factors, and the determined current network selection decision is returned to the network selection decision query entity; if the judgment result is no, no other consideration is considered. The factor directly determines that the called connection network is an IMS network and returns to the network selection decision query entity.
  • the network selection decision query entity may be an inquiry call session control function (I-CSCF) entity of a network entry in the IMS network, or may be a service call session> control function (S-CSCF) entity allocated to the called user in the IMS network. Or an application server (AS) entity assigned to the called user in the IMS network.
  • I-CSCF inquiry call session control function
  • S-CSCF service call session> control function
  • AS application server
  • the I-CSCF or the S-CSCF or the AS entity that is the network selection decision query entity can interact with the network selection decision entity to complete the query of the current network selection decision through the Diameter interface.
  • the network selection decision entity can be an independent network entity, or Embedded in the HSS;
  • the I-CSCF can use the original Cx interface or the extended Cx interface in the original called route query process. At the same time, the current network selection decision query is completed.
  • the S-CSCF can complete the current network by interacting with the HSS after the user is triggered by the extended Cx interface. Choose a decision query.
  • the network selection decision entity is embedded in the HSS and the network selection decision query entity is an AS
  • the AS can process the called user's other industry through the original Sh interface or the extended Sh interface. Interact with the HSS to complete the current network selection decision query.
  • the network selection decision entity may also be an application server AS in the IMS network.
  • the network selection decision query entity is a service call session control function (S-CSCF) entity allocated to the called user in the MS network.
  • S-CSCF which is a network selection decision query entity, interacts with the network selection decision entity through a standard defined IP multimedia service control interface to complete the query of the current network selection decision.
  • the network selection decision query entity is an I-CSCF entity
  • the process of determining the service type of the called party through the I-CSCF entity is as follows:
  • Step 300 After receiving the IMS service request, the I-CSCF entity in the IMS network determines, according to the method name of the service request and the carried SDP description, whether it is suitable to transfer the call to the circuit switched network for the connection of the called party. Transfer to a circuit switched network connection as an example).
  • the I-CSCF can judge that it is not suitable to be transferred to the circuit switched network connection according to the method name of the IMS service request, such as Notify, Info, etc., but cannot be accurately determined according to the method name of the service request only. If the INVITE message is received, it is further determined according to the SDP description carried in the message, what media component is to be interacted in the session, so as to determine whether it is suitable to transfer it to the circuit switched network connection. In addition, in order to more effectively distinguish different service types in the IMS, a mechanism for adding a communication service identifier in the IMS service request message has been defined, and the IMS terminal or the network element can add a specific to the IMS service request message as needed.
  • the communication service identifier to indicate the type of the current service request, such as a normal IMS session, or a "PoC: Push to talk over Cellular" service. Therefore, the judgment of the IMS service type can be
  • the method name and/or the carried SDP description of the service request may also be determined according to the specific service identifier carried in the service request. For the sake of simplicity, the subsequent embodiment only describes the method name and the carried SDP according to the service request. The judgment is made as an example, but various methods listed here are also feasible.
  • Step 310 The I-CSCF entity performs a called route query to the home subscriber server (HSS) by using a Diameter LIR (Location Query Request) message, because the current processed IMS service request is determined.
  • the type of service is suitable for forwarding to the circuit switched network for the called connection, so it is carried in the message
  • the NeDS entity In the IMS network, if the I-CSCF queries the set NeDS entity by using the Diameter interface, the NeDS entity is usually integrated with the HSS, and the route query and network selection decision query are completed in the route query process.
  • Step 320 The HSS/NeDS returns a route query response message LIA to the I-CSCF entity.
  • the LDS request includes the NeDS query indication
  • the called network connection decision decision is performed before the HSS/NeDS returns to the LIA
  • the returned LIA contains routing information and network selection decision results.
  • Step 330 After receiving the response message, the I-CSCF entity performs subsequent connection according to the network selection decision: if the connection network determined by the network selection decision is an IMS domain, the I-CSCF entity forwards the service request to the S-CSCF entity (as shown in the figure). In the selection 1), until the user is connected to the IMS domain; if the connection network determined by the network selection decision is a circuit-switched network, the I-CSCF entity forwards the service request to the Media Gateway Control Function (MGCF) entity (as shown in the figure) The choice 2), until connected to the user in the circuit-switched network. (Subsequent connection processing is the same as the prior art, and will not be described again)
  • MGCF Media Gateway Control Function
  • the network selection decision query entity is an S-CSCF entity
  • the process of determining the called network connection by using the S-CSCF entity is as follows:
  • Step 400 After receiving the IMS service request and querying the standard route, the I-CSCF entity in the IMS network forwards the service request to the S-CSCF entity allocated for the called user.
  • Step 410 The S-CSCF entity determines, according to the type of the IMS service request, whether the service is suitable for forwarding to the circuit switched network connection user, thereby determining whether to perform an NeDS query (in this example, an inquiry is required as an example).
  • Step 420 The S-CSCF entity sends a query message to the NeDS entity by using the newly added Diameter interface to obtain a network selection decision.
  • Step 430 After the NeDS performs the connection network selection decision process, the NeDS returns an NeDS query response message to the S-CSCF entity.
  • Step 440 After receiving the response message, the S-CSCF entity performs subsequent connection according to the network selection decision.
  • the connection network determined by the network selection decision is an IMS domain
  • the S-CSCF entity forwards the service request to the corresponding P-CSCF entity (selection 1 in the figure) until the user is connected to the IMS domain;
  • the connection decision determined connection network is a circuit switched network, and the S-CSCF entity forwards the service request to the Media Gateway Control Function (MGCF) entity (selection 2 in the figure) until it is connected to the user in the circuit switched network.
  • MGCF Media Gateway Control Function
  • the NeDS is implemented by an independent entity, and the S-CSCF queries the NeDS through the newly added Diameter interface.
  • the HSS and the S-CSCF are used.
  • the Cx interface based on the Diameter protocol has been defined, but the original Cx interface function does not support this query. Therefore, the above query process is implemented through the extended Cx interface.
  • the S-CSCF may trigger the service request according to the user subscription data according to the prior art to an AS that processes the user-side service control.
  • the AS performs the foregoing service type judgment, and completes the above query by adding a Diameter interface or a Sh interface between the AS and the HSS according to the judgment result, and then instructs the S-CSCF to perform subsequent connection processing according to the obtained network selection decision.
  • the process is similar to the S-CSCF query process, except that one S-CSCF performs a service triggering operation to the AS before step 410, and the AS performs steps 410, 420.
  • the NeDS returns to the AS.
  • the NeDS queries the response message, and the AS instructs the S-CSCF to perform subsequent routing processing in the IMS or circuit switched network according to the routing decision therein.
  • the method in which the AS instructs the S-CSCF to perform subsequent routing is similar to that in the case where the AS itself is NeDS, see step 630 in the embodiment shown in FIG.
  • the network selection decision query entity is an I-CSCF entity, and the network selection decision entity performs the service type judgment.
  • the process of selecting the connected network selection is as follows:
  • Step 500 After receiving the IMS service request, the I-CSCF entity in the IMS network determines the service type according to the method name and the carried SDP description of the service.
  • Step 510 The I-CSCF entity performs a called route query to the Home Subscriber Server (HSS) by using a Diameter LIR message, and carries a service request type indication (the NeDS entity is integrated with the HSS) in the message.
  • HSS Home Subscriber Server
  • Step 520 The HSS, in addition to processing the route query, determines whether it is suitable according to the service type indication.
  • the currently processed IMS service request is forwarded to the circuit switched network for connection of the called party. If yes, the network selection decision judgment process is further performed according to various related factors. Otherwise, no other factors are considered, and the called connection network is directly determined. IMS network.
  • Step 530 The HSS/NeDS returns a response message including the routing information and the network selection decision to the I-CSCF entity.
  • Step 540 After receiving the response message, the I-CSCF entity performs subsequent connection according to the network selection decision: if the connection network determined by the network selection decision is an IMS domain, the I-CSCF entity forwards the service request to the S-CSCF entity (as shown in the figure). In the selection 1), until the user is connected to the IMS domain; if the connection network determined by the network selection decision is a circuit-switched network, the I-CSCF entity forwards the service request to the Media Gateway Control Function (MGCF) entity (as shown in the figure) The choice 2), until connected to the user in the circuit-switched network. (Subsequent connection processing is the same as the prior art, and will not be described again)
  • MGCF Media Gateway Control Function
  • the IMS service request type indication in the flow shown in FIG. 5 is an indication that the I-CSCF determines and fills in according to the method name of the processed IMS service request and the session description protocol SDP carried therein, including but not limited to: VoIP session, video a session, a multimedia session including a VoIP component, a message based on an IMS session, a short message based on an IP bearer, etc.; or, the IMS service request type indication is: a received IMS service request or the reduced IMS The service request is encapsulated into an extended definition Diameter AVP, which is passed to HSS/NeDS.
  • the S-CSCF or an AS entity that processes the user-side service control can also perform the NeDS query unconditionally, and carry the service type indication in the NeDS query message, and the NeDS combines the service type. Instructing to perform the connection network selection decision, the S-CSCF entity or the AS instructs the S-CSCF to forward the IMS service request to the P-CSCF entity or the MGCF entity according to the NeDS return information, and then perform subsequent routing processing by the P-CSCF entity or the MGCF entity until Continue to the user in the IMS or circuit switched network.
  • the network selection decision query entity is an S-CSCF entity, and the network selection decision entity or the network selection decision entity performs service type judgment to implement the called network connection selection process as follows:
  • Step 600 The I-CSCF entity receives the IMS service request, performs routing query to the HSS, and further The service request is forwarded to the S-CSCF assigned to the user according to the HSS return message.
  • Step 610 The S-CSCF performs iFC detection according to the user subscription data, wherein the network selection decision query entity S-CSCF determines whether to perform NeDS query according to the service type by using the iFC setting, that is, the service request through the iFC
  • the method (Method) and/or the SDP setting only perform corresponding service triggering on the service request suitable for the connection to the circuit switched network connection user, so as to perform the called connection network decision query; if the above-mentioned differentiated service type setting is not performed in the iFC
  • the S-CSCF forwards the service request to the NeDS as the application server AS according to the matched iFC.
  • Step 620 The NeDS performs a service type judgment to determine whether it is suitable for the circuit switched network connection user. If it is suitable, it combines other connection network selection factors to make a comprehensive decision, otherwise it directly decides to connect in the IMS.
  • the NeDS can consider that the triggered service request is suitable for the circuit switched network connection user, thereby skipping the judging process.
  • Step 630 NeDS reflects the called connection network selection decision by using the returned IMS service request: If the NeDS decides to switch to the circuit switched network connection, the destination service request-URI in the returned service request is modified to the circuit-switched format in the Td-URI format.
  • the virtual roaming number CSRN of the network (the composition of the CSRN should have a clear correspondence with the user number of the user in the circuit-switched network, so that subsequent calls back to the circuit-switched network can be routed normally in the circuit-switched network, and its implementation is in the current voice.
  • the destination identifier Request-URI in the returned service request is not modified
  • the NeDs determines that the service type of the currently processed service request is a multimedia session including VoIP, and decides to perform the session splitting process, the service request received from the S-CSCF is terminated, and two new ones are directly carried.
  • the media component of the SDP description and the destination identifier Request-URI are not the same.
  • the same service request is sent to the S-CSCF, which contains only the VoIP component, where the Request-URI indicates the connection in the circuit switched network, and a media component other than VoIP, where the Request-URI indicates the connection in the IMS.
  • Step 640 The S-CSCF forwards the IMS service request to the P-CSCF or the MGCF according to the Request-URI in the service request returned by the NeDS, and then performs subsequent routing processing by the P-CSCF or the MGCF until the IMS or circuit switched network is connected.
  • the user select 1 or select 2 in the figure; when the NeDS returns two new service requests indicating that the session splitting process is to be performed, the S-CSCF performs subsequent connection processing according to the respective Request-URIs of the two service requests.
  • an embodiment similar to that shown in FIG. 5 may be adopted, where the service type analysis is performed by the S-CSCF and the corresponding service type indication is carried in the service request forwarded to the NeDS; however, since the NeDS is already available here It is preferable to obtain all the information, and it is preferable to perform the processing as described above.
  • the network selection decision query entity in this embodiment includes: a receiving module 700, a determining module 701, a processing module 702, and a sending module 703.
  • the receiving module 700 receives the IP multimedia directed to the served user.
  • the determining module 701 determines whether it is suitable to transfer the service request to the circuit switched network connection according to the service type of the IMS service request;
  • the processing module 702 obtains the current from the network selection decision entity when the determination result is yes
  • the network selection decision, or when the judgment result is no directly connects the called user in the IMS domain;
  • the sending module 703 connects the called party according to the obtained current network selection decision, or directly connects the called party in the IMS domain.
  • the network selection decision query entity may be an inquiry call session control function I-CSCF entity in the IMS network, or a service call session control function S-CSCF entity, or an application server AS entity.
  • the foregoing network selection decision entity in this embodiment includes: a receiving module 800, a determining module 801, a decision module 802, and a sending module 803; wherein, the receiving module 800 receives the called connection network decision query request;
  • the determining module 801 determines, according to the service type of the IMS service request, whether it is suitable to transfer the service request to the circuit switched network connection;
  • the decision module 802 performs the current network selection decision judgment when the determination result is yes, or the determination result is no.
  • the sending module 803 sends the network to the network selection decision query entity Network selection decision.

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Description

0096
选择被叫接续网络的方法、 装置及网络系统
技术领域
本发明涉及通信技术领域， 尤其涉及一种选择被叫接续网络的方法、 装 置及网络系统。 背景技术
从 3GPP R5阶段开始， 通用移动通讯系统（UMTS )核心网划分为电路 交换（ Circuit Switched Domain, CS )域、 分组交换（ Packet Switched Domain, PS )域以及 IP多媒体子系统（IMS )域三个子系统。
CS域用于向用户提供电路型业务的连接， 包括：
移动交换中心 MSC ( MSC Server/CS-MGW ): 完成电路交换型业务的交 换和信令控制功能。
关口移动交换中心 GMSC: 某一网络中完成移动用户路由寻址功能的 MSC, 可与 MSC合设或分设。
网络互通功能 IWF: 与 MSC紧密相关， 完成 PLMN网与 ISDN、 PSTN、 PDN网络间的互通（主要完成信令转换功能；)， 具体功能根据业务和网络种类 不同而有不同的规定。
PS域（ Packet Switched Domain)用于向用户提供分组型业务的连接，包括： 通用无线分组服务（GPRS ) 支持节点 GSN ( SGSN、 GGSN ): 完成分组 业务用户的分组包的传送。 服务 GSN ( SGSN )提供核心网与无线接入系统 BSS、 RNS 的连接， 完成分组型数据业务的移动性管理、 会话管理等功能， 管理 MS在移动网络内的移动和通信业务， 关口 GSN ( GGSN )作为移动通 信系统与其它公用数据网之间的接口， 同时还具有查询位置信息的功能。
SGSN、 GGSN均提供计费信息。
边缘网关 BG: 完成两 GPRS网络间的互通， 保证网络互通的安全性。 此外， CS域和 PS域共用的功能实体还包括：
归属位置寄存器 HLR7鉴权中心 AuC: HLR完成用户签约数据（MSISDN、 IMSI、 PDP ADDRESS, 签约的电信业务和补充业务及其业务的适用范围等） 和位置信息（MSC/VLR号、 SGSN号码、 GMLC等）的管理， AuC则存储用 户的鉴权算法和密钥。
其他包括处理拜访用户各种数据信息的拜访位置寄存器 VLR, 存储用户 设备标识 IMEI 信息的设备标识寄存器 EIR 以及短消息中心网关 MSC ( SMS-GMSC/ SMS IMSC )等。
IMS ( IP Multimedia Subsystem )域： 是 3GPP R5阶段增加的叠加在已有 分组域之上的一个核心网子系统， 采用分组域为其上层控制信令和媒体传输 的承载通道， 引入会话初始协议 SIP协议作为业务控制协议， 利用 SIP简单、 易扩展、 媒体组合方便的特点， 通过将业务控制与承载控制分离， 提供丰富 的多媒体业务； IMS 中主要的功能实体包括控制用户注册、 会话控制等功能 的呼叫会话控制功能实体 CSCF、 提供各种业务逻辑控制功能的应用服务器 AS、 集中管理用户签约数据的归属用户服务器 HSS, 以及用于实现与电路交 换网互通的媒体网关控制功能 MGCF/IMS媒体网关 IM-MGW。用户通过当前 所在地代理节点代理呼叫会话控制功能实体 P-CSCF接入 IMS,会话和业务触 发控制及与 AS 的业务控制交互则由其归属地的归属域服务节点服务呼叫会 话控制功能实体 S-CSCF完成。 其中， IMS系统中的 HSS是 HLR的超集， 功 能上能够兼容 HLR, 但由于建网过程等因素， 具体组网中 HSS与 CS/PS HLR 也可能是分设的情况。
由 3GPP标准所定义的 IMS架构全面解决了 IP承载下提供多媒体业务所 需要解决的漫游计费、 服务质量 QoS、 安全保障等关键的可运营问题， 其架 构和思路已获得业界公认， 3GPP2, TISPAN均以 3GPP模型作为基础和参照 进行了相应 IP多媒体网络架构和业务体系的定义， 3GPP也已开始了针对无 线局域网 WLA 接入与通用移动通讯系统 UMTS互通（I-WLAN )、 固定宽 带接入 IMS ( FBI ) 以及面向多种接入技术的全 IP网 （AIPN )等课题研究， 用户将可以根据其签约， 通过单一多模终端或多种类型的不同终端， 经由不 同接入技术的接入网接入 IMS, 以获得统一的多媒体业务， 包括 VoIP业务； 其中， 负责研究 GSM及 WCDMA系统标准的 3GPP以及负责研究 CDMA和 CDMA2000系统标准的 3GPP2均通过了一个研究 GSM、 CDMA WCDMA 以及 CDMA2000系统中的 CS域呼叫与通过 WLAN接入 IMS提供的 VoIP业 务间业务连续性问题的工作课题一话音业务连续性课题， 提出了解决包括在 用户做为被叫时进行 CS/IMS域间被叫接续网络选择，以及因终端移动等导致 的 CS-IMS间切换等问题， 以保障业务连续性，从而适应网络及业务发展的需 求。
在一个 "话音业务连续性" 业务签约用户作为被叫时， 话音业务连续性 课题中要求基于以下一些网絡选择相关因素， 进行综合判断以决定被叫接续 网络， 从而提供更好的业务感受， 如保证更高的接续到被叫用户的成功率、 选择能提供更优质量或更低资费的方式等。 这些网絡选择相关因素包括： 用 户在 CS/IMS注册状态， 业务、签约数据或运营商以及用户本人设置的网络选 择策略 /偏好，当前是否存在在某个域正在进行的呼叫情况，以及籍以接入 IMS 的 IP接入网的能力等。
另一方面， 随着话音业务连续性课题研究工作的进展， 目前已经选择了 一种静态锚定到 IMS并由 IMS集中控制的 CS-IMS双向切换方案， 其基本思 想是， 在用户的 IMS归属域为其分配一个应用服务器 AS作为呼叫连续性控 制功能（CCCF ), 将所有涉及到该用户的电路域呼叫和 IMS域会话的控制信 令都送至该应用服务器进行锚定， 由该 CCCF以第三方控制的方式控制切换 用户与对端用户间的通话连接， 并根据用户请求控制完成跨域切换。 如图 1A 所示， 切换用户与对端用户的通话连接在该应用服务器上被分为两段， 当用 户需要进行跨域切换时， 由切换用户在切换后的网絡域重新建立其到该应用 服务器的连接， 建立成功后由该应用服务器控制在自身到对端用户的连接上 进行重协商， 使得对端用户与切换用户在新的连接上进行话音交互。 在切换 过程中由 CCCF控制完成到 VCC用户间两段会话的替换 (迁转）。
这样， 对于一个 "话音业务连续性" 业务签约用户， 为了提供对后续通 话过程中可能发生的切换的控制， 其被叫业务将会总是被先路由到其 IMS域 以进行上述的锚定， 然后再由 IMS 域的被叫接续网絡选择决策功能 ( IMS-NeDS )进一步根据上述网络选择相关因素综合判断确定接续到终端的 方式： 直接在 IMS接续还是转到 CS域接续， 如图 1B所示。
虽然话音业务连续性课题所针对的仅仅是话音业务，但实际上，除了 VoIP 业务之外，在 IMS域可以为用户提供极其丰富的多媒体业务，也就是说， IMS 的业务能力大大丰富于 CS域。 一个在 IMS域所接到的指向话音连续性业务 签约用户的业务请求， 比如一个进行多媒体交互的 IMS会话请求， 并不一定 适合于直接转到 CS域接续用户。 因此，按现有技术不考虑业务请求的类型而 将其直接转到 CS域将可能导致提供的多媒体业务质量降低，甚至不能提供所 需要的多媒体业务从而导致业务失败的情况。
此外， 随着对被叫接续网络选择决策功能的研究的深入， 业界逐渐认为 这一功能的普遍适用于具备多域接入能力的用户的被叫接续过程， 也就是说， 其适用范围已经超出了话音业务连续性课题本身； 相应的， 被叫接续网络选 择决策功能所选择的被叫接续网络范围， 也不再仅仅包含 CS域和 IMS域， 还包括与 CS域一同被统称电路交换网络、 其业务能力同样与 IMS域有较大 差异的 PSTN网络和 ISDN网络（为筒洁起见， 本文后续将 GSM、 CDMA, WCDMA以及 CDMA2000系统中的 CS域和 PSTN网络和 ISDN网络统称为 电路交换网絡）， 甚至接入 IMS的不同 IP接入网； 因此， 作为一种通用的被 叫接续网络选择决策功能， 更不能仅仅局限于话音业务， 而应充分考虑 IMS 域丰富的多媒体业务， 以及 IMS域与电路交换网络不同的业务能力， 避免因 不考虑业务请求的类型而将其直接转到电路交换网絡将可能导致提供的多媒 体业务质量降低， 甚至不能提供所需要的多媒体业务从而导致业务失败的情 况。 发明内容
本发明实施例提供一种选择被叫接续网络的方法、 装置及网络系统， 以 避免将业务请求直接转接到电路交换网絡而影响业务提供的问题。 一种选择被叫接续网络的方法， 包括如下步骤：
接收指向所服务用户的 IP多媒体子系统（IMS )业务请求；
根据所迷 IMS业务请求的业务类型判断是否适合将该业务请求转接到电 路交换网络接续， 若是， 则进行被叫接续网络选择决策判断， 并按当前被叫 接续网络选择决策进行后续接续处理， 否则， 则不再进行被叫接续网络选择 决策判断或直接决策在 IMS域接续该 IMS业务请求。
一种通信装置， 包括：
用于接收指向所服务用户的 IP多媒体子系统 IMS业务请求的模块； 用于根据所述 IMS业务请求的业务类型判断是否适合将该业务请求转接 到电路交换网 ^ 续的模块；
用于在判断结果为是时， 获取当前网络选择决策， 或者在判断结果为否 时， 直接在 IMS接续被叫用户的模块；
用于接续被叫的模块。
一种通信装置， 包括：
用于接收被叫接续网络决策查询请求的模块；
用于根据所述 IMS业务请求的业务类型判断是否适合将该业务请求转接 到电路交换网 矣续的模块；
用于在判断结果为是时， 进行当前网络选择决策判断， 或者在判断结果 为否时， 直接决定在 IMS接续被叫用户的模块；
用于向请求者发送网络选择决策的模块。
一种网络系统， 包括：
网络选择决策实体， 用于在网络选择决策查询实体查询时根据网络选择 相关因素进行被叫接续网络选择决策判断；
网络选择决策查询实体， 与所述网络选择决策实体连接， 用于在接收到 指向所服务用户的 IMS业务请求时进行业务类型判断， 并在根据所述业务类 型判断该业务请求适合被接续到电路交换网络时， 向所述网络选择决策实体 查询获取当前被叫接续网络选择决策， 然后按该决策对所述 IMS业务请求进 行后续接续处理。
一种网络系统， 包括：
网络选择决策查询实体， 用于在接收到指向所服务用户的 IMS业务请求 时， 向网络选择决策实体查询当前被叫接续网絡选择决策， 并按该决策对所 述 IMS业务请求进行后续接续处理；
网络选择决策实体， 与所述网絡选择决策查询实体连接， 用于至少根据 所述 IMS业务请求的业务类型确定当前被叫接续网络选择决策并提供给所述 网络选择决策查询实体。
本发明实施例在 IMS域进行被叫接续网络选择决策的过程中， 依据当前 处理的业务类型， 仅对适合转至电路交换网络接续用户的业务请求考虑根据 各种网络选择相关因素进行电路交换网络和 IMS域间的被叫接续网络选择， 从而不仅能够通过灵活的被叫接续网络选择功能， 充分利用不同网絡及终端. 能力， 保证为用户提供更好的业务感受以及为运营商实现网络资源更为有效 的利用， 而且能够保证当确定被叫接续网络为电路交换网络时的业务质量不 会因 IMS与电路交换网络间网絡能力差异而受到损失。 采用本发明能够进一 步改善用户的业务感受。 附图说明
图 1A为在现有通信系统中实现话音业务连续性的示意图；
图 1B为现有技术中在 IMS集中进行被叫接续网络选择的示意图； 图 2A、 图 2B为本发明实施例中 IMS网络系统示意图；
图 3、 图 4、 图 5、 图 6为本发明实施例中进行被叫接续网络选择的流程 图；
图 7为本发明实施例中网络选择决策查询实体的结构示意图；
图 8为本发明实施例中网络选择决策实体的结构示意图。 具体实施方式
为了避免在 IMS网络中将当前处理的 IMS业务请求转接到电路交换网络 进行被叫接续时因网络业务能力差异影响业务的正常提供， 本实施例在网络 选择决策查询实体与网络选择决策实体进行交互以确定被叫网络选择的过程 中， 根据业务请求的类型判断是否适合将该业务请求转接到电路交换网络进 行接续， 从而决定被叫接续网络选择处理。 对于适合转接到电路交换网络的
IMS 业务请求， 则进一步根据各种网络选择相关因素进行被叫接续网络选择 决策判断， 并根据当前网絡选择决策进行后续接续处理； 对于不适合转接到 电路交换网络的 IMS业务请求， 则不再进行被叫网絡选择决策查询交互， 或 由网络选择决策实体直接决策在 IMS域中接续该业务请求。
IMS业务请求的业务类型可以根据 IMS业务请求的方法名和 /或其中携带 的会话描述协议 SDP描述确定， 也可以根据业务请求消息中特定的业务标识 确定； 根据业务类型判断是否适合于转接到电路交换网络的判断可以直接基 于 IMS业务请求的方法名和 /或其中携带的会话描述协议 SDP描述，或业务请 求消息中特定的业务标识来完成， 也可以基于根据 IMS业务请求的方法名和 / 或其中携带的会话描述协议 SDP描述， 或者业务请求消息中特定的业务标识 所确定的业务类型指示来完成。 若判断该业务请求用于建立一个 VoIP的话音 交互， 或者， 用于建立可以转为电路交换视频业务的视频交互， 或者， 用于 建立一个包含 VoIP话音成分的多媒体交互， 则确定该业务请求适合转接到电 路交换网络进行接续， 否则， 确定该业务请求不适合转接到电路交换网络进 行接续。
此外， 运营商可以为用户的不同业务分配不同的用户标识， 比如， 为适 合转接到电路交换网络接续的业务分配专用的用户标识， 这样， 以上业务类 型的判断也可以基于所述业务请求中的目的标识来进行， 当业务请求中的目 的标识为网絡中为用户适合转接到电路交换网络接续的业务分配的专用的用 户标识时， 则确定该业务请求适合转接到电路交换网络进行接续， 否则， 确 定该业务请求不适合转接到电路交换网络进行接续。
不过， 这种基于为用户分配不同用户标识的方法虽然可行， 但会增加对 用户标识资源的占用， 对方用户呼叫该用户时也不太方便， 所以后续的实施 例中主要采用了前一判断方式。
参阅图 2A所示， 在一个实施例中， 可以由网络选择决策查询实体判断是 否适合将当前处理的 IMS业务请求转接到电路交换网络进行被叫接续。 若网 络选择决策查询实体判断结果为是， 则进一步向网络选择决策实体查询获取 当前网络选择决策， 并按该决策进行后续接续处理； 若判断结果为否， 则不 进行当前被叫接续网络选择决策查询， 直接按标准规定方式在 IMS接续。
参阅图 2B所示， 在另一实施例中， 也可以由网络选择决策实体在接收到 网络选择决策查询实体的查询请求时判断是否适合将当前处理的 IMS业务请 求转接到电路交换网络进行被叫接续。 若判断结果为是， 则进一步根据各种 网絡选择相关因素进行网络选择决策判断处理， 并将所确定的当前网络选择 决策返回给网络选择决策查询实体； 若判断结果为否， 则不再考虑其他因素， 直接确定被叫接续网络为 IMS网络并返回给网絡选择决策查询实体。
网络选择决策查询实体可以是 IMS网絡中网络入口的查询呼叫会话控制 功能（I-CSCF ) 实体， 也可以是 IMS网络中为被叫用户分配的服务呼叫会话 > 控制功能（S-CSCF )实体， 或者是 IMS网络中一个为被叫用户分配的应用服 务器（AS ) 实体。
作为网络选择决策查询实体的 I-CSCF或 S-CSCF或 AS 实体可以通过 Diameter接口来与网络选择决策实体交互完成当前网络选择决策的查询， 网 络选择决策实体可以是一个独立的网络实体， 也可以内嵌在 HSS中实现；
当网络选择决策实体内嵌在 HSS 中实现， 且网络选择决策查询实体为 I-CSCF时， I-CSCF可以通过原有的 Cx接口或经扩展的 Cx接口， 在原有的 被叫路由查询过程中同时完成当前网络选择决策查询。
当网络选择决策实体内嵌在 HSS 中实现， 且网络选择决策查询实体为 S-CSCF时， S-CSCF可以通过经扩展的 Cx接口，在完成用户被叫侧业务触发 后与 HSS交互完成当前网絡选择决策查询。 . 当网络选择决策实体内嵌在 HSS中实现，且网絡选择决策查询实体为 AS 时， AS可以通过原有的 Sh接口或经扩展的 Sh接口， 在处理被叫用户其他业 务过程中与 HSS交互完成当前网絡选择决策查询。
在本发明中， 网络选择决策实体也可以是 IMS 网络中一个应用服务器 AS, 这时， 网络选择决策查询实体是 MS网络中为被叫用户分配的服务呼叫 会话控制功能（S-CSCF ) 实体， 作为网络选择决策查询实体的 S-CSCF通过 标准定义的 IP多媒体业务控制接口来与网络选择决策实体交互， 完成当前网 络选择决策的查询。
在以下几个具体实施例中， 分别体现了以上不同情况下的具体实现过程。 参阅图 3所示， 网絡选择决策查询实体为 I-CSCF实体， 通过该 I-CSCF 实体进行业务类型判断实现被叫接续网络选择的过程如下：
步骤 300、 IMS网络中的 I-CSCF实体接收到 IMS业务请求后， 根据该业 务请求的方法名和携带的 SDP描述确定是否适合将其转接到电路交换网络进 行被叫接续 （本例后续以适合转接到电路交换网络接续为例）。
需要说明的是， 这里， I-CSCF可以仅根据 IMS业务请求的方法名判断不 适合将其转接到电路交换网络接续， 如 Notify、 Info等， 但如果仅根据业务请 求的方法名无法准确判断，如收到 INVITE消息， 则还要进一步根据消息中携 带的 SDP描述判断会话中要交互的是怎样的媒体成分， 从而判断是否适合将 其转接到电路交换网络接续。 此外， 为了更为有效的区分 IMS中不同的业务 类型，目前已经定义了一种在 IMS业务请求消息中添加通讯业务标识的机制， IMS终端或网元可以根据需要在 IMS业务请求消息中添加特定的通讯业务标 识， 以指明当前业务请求的类型， 如是一个普通的 IMS会话， 还是一个 "无 线一键通，， ( PoC: Push to talk over Cellular )业务。 因此， IMS业务类型的判 断， 不仅可以根据该业务请求的方法名和 /或携带的 SDP描述， 也可以根据该 业务请求中携带的特定的业务标识来判断。 为了简便起见， 后续实施例仅以 根据该业务请求的方法名和携带的 SDP描述进行判断为例进行说明， 但此处 列举的多种方式也都是可行的。
步骤 310、 I-CSCF实体以 Diameter LIR (位置查询请求） 消息向归属用 户服务器（HSS )进行被叫路由查询， 由于判断当前所处理的 IMS业务请求 的业务类型适合于转至电路交换网络进行被叫接续， 因此在该消息中携带
NeDS查询指示。
在 IMS网络中， 若 I-CSCF以 Diameter接口查询所设置的 NeDS实体， 则通常将 NeDS实体与 HSS设置为一体， 并在路由查询过程中一并完成路由 查询和网络选择决策查询。
步驟 320、 HSS/NeDS向 I-CSCF实体返回路由查询响应消息 LIA; 此时， 由于 LIR请求中包含了 NeDS查询指示， 因此在 HSS/NeDS返回 LIA之前进 行被叫接续网络选择决策判断， 并在返回的 LIA中包含路由信息和网络选择 决策结果。
步驟 330、 I-CSCF实体收到响应消息后， 根据网絡选择决策进行后续接 续：若网络选择决策确定的接续网络为 IMS域，则 I-CSCF实体将业务请求转 发到 S-CSCF实体（如图中的选择 1 ), 直到在 IMS域中接续到用户； 若网络 选择决策确定的接续网络为电路交换网络， 则 I-CSCF实体将业务请求转发到 媒体网关控制功能（MGCF ) 实体（如图中的选择 2 ), 直到在电路交换网络 中接续到用户。 （后续的接续处理与现有技术相同， 不再赘述）
参阅图 4所示， 网络选择决策查询实体为 S-CSCF实体， 通过该 S-CSCF 实体进行判断实现被叫接续网络选择的过程如下：
步骤 400、 IMS网络中的 I-CSCF实体接收到 IMS业务请求并通过标准的 路由查询后， 将该业务请求转发到为被叫用户分配的 S-CSCF实体。
步骤 410、 S-CSCF实体根据 IMS业务请求的类型判断该次业务是否适合 于转至电路交换网络接续用户， 从而决定是否要进行 NeDS 查询 （本例寸以 需要查询为例）。
步骤 420、 S-CSCF实体以新增的 Diameter接口向 NeDS实体发送查询消 息， 以获取网络选择决策。
步骤 430、 NeDS进行接续网络选择决策判断处理后， 向 S-CSCF实体返 回 NeDS查询响应消息。
步骤 440、 S-CSCF实体收到响应消息后， 根据网络选择决策进行后续接 续： 若网络选择决策确定的接续网络为 IMS域， 则 S-CSCF实体将业务请求 转发到相应的 P-CSCF实体（如图中的选择 1 ),直到在 IMS域中接续到用户； 若网络选择决策确定的接续网络为电路交换网络，则 S-CSCF实体将业务请求 转发到媒体网关控制功能（MGCF ) 实体（如图中的选择 2 ), 直到在电路交 换网络中接续到用户。 （后续的接续处理与现有技术相同， 不再赘述）
需要说明的是， 本实施例以一个独立的实体实现 NeDS为例， 则 S-CSCF 通过新增的 Diameter接口查询 NeDS , 当将该 NeDS与 HSS合设在一起时 , 由于 HSS与 S-CSCF间已经定义了基于 Diameter协议的 Cx接口， 但原有 Cx 接口功能并不能支持这一查询，因此，上述查询过程通过扩展的 Cx接口实现。
类似的， 无论 NeDS是以一个独立的实体实现还是与 HSS合设在一起， 还可以在 S-CSCF按照现有技术根据用户签约数据将业务请求触发到一个处 理用户被叫侧业务控制的 AS后， 由该 AS进行上述业务类型的判断， 并根据 判断结果分別通过新增 Diameter接口或 AS与 HSS间 Sh接口及其扩展完成上 述查询， 然后根据获得的网络选择决策指示 S-CSCF进行后续接续处理，其基' 本过程与 S-CSCF查询过程类似， 只是在步骤 410前多一个 S-CSCF向 AS进 行业务触发的操作， 并由 AS执行步骤 410， 420, 在步骤 430中， NeDS向 AS返回 NeDS查询响应消息， AS根据其中的路由决策指示 S-CSCF进行后续 在 IMS或电路交换网络接续的路由处理。 AS指示 S-CSCF进行后续路由的方 法与 AS自身作为 NeDS时类似， 参见图 6所示实施例中步骤 630。
参阅图 5所示， 网络选择决策查询实体为 I-CSCF实体， 通过网络选择决 策实体进行业务类型的判断实现被叫接续网絡选择的过程如下：
步骤 500、 IMS网络中的 I-CSCF实体接收到 IMS业务请求后， 根据该业 务情求的方法名和携带的 SDP描述确定业务类型。
步骤 510、 I-CSCF实体以 Diameter LIR消息向归属用户服务器（ HSS ) 进行被叫路由查询， 并且在该消息中携带业务请求类型指示 （NeDS 实体与 HSS设置为一体）。
步骤 520、 HSS除处理路由查询外，还根据业务类型指示判断是否适合将 当前处理的 IMS业务请求转接到电路交换网絡进行被叫接续， 如果是， 则进 一步根据各种相关因素进行网络选择决策判断处理， 否则， 则不再考虑其他 因素， 直接确定被叫接续网络为 IMS网络。
步骤 530、 HSS/NeDS向 I-CSCF实体返回包含路由信息和网络选择决策 的响应消息。
步骤 540、 I-CSCF实体收到响应消息后， 根据网络选择决策进行后续接 续： 若网络选择决策确定的接续网络为 IMS域，则 I-CSCF实体将业务请求转 发到 S-CSCF实体（如图中的选择 1 ), 直到在 IMS域中接续到用户； 若网络 选择决策确定的接续网络为电路交换网络， 则 I-CSCF实体将业务请求转发到 媒体网关控制功能（MGCF ) 实体（如图中的选择 2 ), 直到在电路交换网络 中接续到用户。 （后续的接续处理与现有技术相同， 不再赘述）
图 5所示流程中的 IMS业务请求类型指示为 I-CSCF根据所处理的 IMS 业务请求的方法名以及其中携带的会话描述协议 SDP描述判断并填写的指 示， 包括但不限于： VoIP会话、 视频会话、 包含 VoIP成分的多媒体会话、 基' 于 IMS会话的消息、 基于 IP承载的短消息等； 或者， 所述 IMS业务请求类 型指示为： 将收到的 IMS业务请求或经裁减的所述 IMS业务请求封装为扩展 定义的 Diameter AVP, 传递给 HSS/NeDS。
结合上述图 4和图 5所示流程可知， S-CSCF或一个处理用户被叫侧业务 控制的 AS实体同样可以无条件进行 NeDS查询，并在 NeDS查询消息中携带 业务类型指示， 由 NeDS结合业务类型指示进行接续网络选择决策， S-CSCF 实体或 AS指示 S-CSCF根据 NeDS返回信息将 IMS业务请求前传至 P-CSCF 实体或 MGCF实体， 进而由 P-CSCF实体或 MGCF实体进行后续的路由处理 直至在 IMS或电路交换网 矣续到用户。
参阅图 6所示， 网絡选择决策查询实体为 S-CSCF实体，通过网络选择决 策查询实体或网絡选择决策实体进行业务类型判断实现被叫接续网络选择的 过程如下：
步驟 600、 I-CSCF实体接到 IMS业务请求， 向 HSS进行路由查询， 并根 据 HSS返回信息将业务请求前传至为用户分配的 S-CSCF。
步骤 610、 S-CSCF根据用户签约数据进行 iFC检测，其中，可以通过 iFC 的设置实现"网络选择决策查询实体 S-CSCF根据业务类型判断决定是否进行 NeDS的查询"， 即通过 iFC中业务情求方法（Method )和 /或 SDP的设置， 仅对适合转至电路交换网络接续用户的业务请求进行相应的业务触发， 从而 进行被叫接续网络决策查询； 如果 iFC中没有进行上述区分业务类型的设置， 则 S-CSCF根据匹配的 iFC将业务请求前传至作为应用服务器 AS的 NeDS。
步骤 620、 NeDS进行业务类型的判断以确定是否适合转电路交换网络接 续用户， 如果适合， 则再结合其他接续网络选择因素进行综合决策， 否则直 接决定在 IMS接续。
这里， 如果步骤 610中的 iFC 已经进行了上述区分业务类型的设置， 则 NeDS可以认为被触发上来的业务请求均是适合转电路交换网络接续用户的， 从而跳过这一判断过程。
步骤 630、 NeDS通过返回的 IMS业务请求体现被叫接续网络选择决策： 若 NeDS 决定改由电路交换网络接续， 则将返回的业务请求中目的标识 Request-URI修改为 Td-URI格式的指向电路交换网络的虚拟漫游号码 CSRN ( CSRN的构成应与用户在电路交换网络的用户号码有明确的对应关系，使得 后续转回电路交换网络的呼叫可以在电路交换网络正常路由， 其实现方式在 当前的话音业务连续性业务课题研究中已有成熟结果）； 或者， 对于 GSM、 CDMA, WCDMA以及 CDMA2000系统中的 CS域的用户， 还可以首先通过 HSS/HLR或根据从 HSS/HLR获得的信息向 CS域的 MSC/VLR获取 CS域漫 游号码， 然后将 Request-URI修改为 Tel-URI格式的 CS域漫游号码。
若 NeDS决定仍然在 IMS域继续， 则不修改返回的业务请求中目的标识 Request-URI;
若 NeDs判断当前处理的业务请求的业务类型为包括 VoIP的多媒体会话， 并决定要进行会话分拆处理时，则终结从 S-CSCF收到的业务请求， 并直接发 起两个新的、 所携带的 SDP描述的媒体成分和目的标识 Request-URI都不相 同的业务请求发送至 S-CSCF,—个仅包含 VoIP成分，其中 Request-URI指示 在电路交换网络接续， 一个包含 VoIP之外的媒体成分， 其中 Request-URI指 示在 IMS接续。
步骤 640、 S-CSCF根据 NeDS返回的业务请求中的 Request-URI将 IMS 业务请求前传至 P-CSCF或 MGCF, 进而由 P-CSCF或 MGCF进行后续的路 由处理直至在 IMS或电路交换网絡接续到用户 （如图中的选择 1或选择 2 ); 当 NeDS返回两个新的业务请求指示要进行会话分拆处理时 , S-CSCF根据两 个业务请求各自的 Request-URI分别完成后续接续处理。
在本实施例中，也可采用类似图 5所示实施例方式， 由 S-CSCF完成业务 类型分析并在前传至 NeDS 的业务请求中携带相应的业务类型指示； 不过， 由于此处 NeDS已经可以得到全部信息， 较佳的是按照上述方式进行'处理。
本实施例中一种前述的网络选择决策查询实体如图 7所示， 包括： 接收 模块 700、判断模块 701、处理模块 702和发送模块 703; 其中， 接收模块 700 接收指向所服务用户的 IP多媒体子系统 IMS业务请求； 判断模块 701根据所 述 IMS业务请求的业务类型判断是否适合将该业务请求转接到电路交换网络 接续； 处理模块 702在判断结果为是时， 从网络选择决策实体获取当前网络 选择决策， 或者在判断结果为否时， 直接在 IMS域接续被叫用户； 发送模块 703根据获取的当前网络选择决策接续被叫， 或直接在 IMS域接续被叫。 如 前所述， 该网络选择决策查询实体可以是 IMS网络中的查询呼叫会话控制功 能 I-CSCF实体， 也可以是服务呼叫会话控制功能 S-CSCF实体， 还可以是应 用服务器 AS实体。
本实施例中一种前述的网络选择决策实体如图 8所示， 包括： 接收模块 800、 判断模块 801、 决策模块 802和发送模块 803; 其中， 接收模块 800接 收被叫接续网络决策查询请求； 判断模块 801根据所述 IMS业务请求的业务 类型判断是否适合将该业务请求转接到电路交换网络接续； 决策模块 802在 判断结果为是时， 进行当前网络选择决策判断， 或者在判断结果为否时， 直 接决定在 IMS域接续被叫用户； 发送模块 803向网络选择决策查询实体发送 网络选择决策。
通过在现有技术方案的基础上增加对 IMS及电路交换网絡存在业务能力 差异的考虑， 保证不会由被叫接续网络选择功能引发因不同网络能力差异导 致的业务损失， 使得这一可以充分利用不同网络及终端能力为用户提供更好 的业务感受或为运营商实现网络资源更为有效的利用的被叫接续网络选择功 能， 得以更为完善地实现。
显然， 本领域的技术人员可以对本发明进行各种改动和变型而不脱离本 发明的精神和范围。 这样， 倘若对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、 一种选择被叫接续网络的方法， 其特征在于， 包括如下步骤： 接收指向所服务用户的 IP多媒体子系统 IMS业务请求；
根据所述 IMS业务请求的业务类型判断是否适合将该业务请求转接到电 路交换网絡接续， 若是， 则进行被叫接续网络选择决策判断， 并按当前被叫 接续网络选择决策进行后续接续处理， 否则， 则不再进行被叫接续网络选择 决策判断或直接决策在 IMS域接续该 IMS业务请求。
2、 如权利要求 1所述的方法， 其特征在于， 若所述 IMS业务请求的业务 类型为用于建立一个 VoIP的话音交互的业务类型， 或为用于建立一个可以转 为电路交换视频业务的视频交互的业务类型， 或为用于建立一个包含 VoIP话 音成分的多媒体交互的业务类型时， 则判断为适合 ^！夺所述 IMS业务请求接续 到电路交换网络。
3、 如权利要求 1所述的方法， 其特征在于， 由网络中的网絡选择决策查 询实体进行所述判断； 若判断结果为是， 则向网络选择决策实体查询当前被 叫接续网络选择决策并按该决策进行后续的业务接续处理，否则，直接在 IMS 域接续该业务请求。
4、 如权利要求 3所述的方法， 其特征在于， 所述网络选择决策查询实体 是指网络入口的查询呼叫会话控制功能 I-CSCF实体，或者为被叫用户分配的 服务呼叫会话控制功能 S-CSCF实体， 或者为用户分配的一个应用服务器 AS 实体， 并且， 所述网络选择决策查询实体根据所述 IMS业务请求的方法名和 / 或该请求消息中所携带的会话描述协议 SDP描述、 或业务请求中携带的业务 标识、 或业务请求中的目的标识进行所述判断。
5、 如权利要求 1所述的方法， 其特征在于， 网络中的网络选择决策查询 实体在接收到所述 IMS业务请求并向网络选择决策实体查询当前被叫接续网 絡选择决策时， 由该网络选择决策实体进行所述判断； 并且， 若判断结果为 是， 则进一步进行决策判断处理以确定被叫接续网络， 否则， 直接确定被叫 接续网络为 IMS网络。
6、 如权利要求 5所述的方法， 其特征在于， 所述网络选择决策查询实体 是指为被叫用户分配的服务呼叫会话控制功能 S-CSCF实体，该 S-CSCF实体 通过 IP多媒体业务控制 ISC接口将接收到的 IMS业务请求转发到所述网络选 择决策实体进行当前被叫接续网络选择决策查询， 所述网络选择决策实体根 据所述 IMS业务请求的方法名和 /或该请求消息中所携带的会话描述协议 SDP 描述， 或业务请求中携带的业务标识， 或业务请求中的目的标识进行所述判 断。
7、 如权利要求 6所述的方法， 其特征在于， 在所述网洛选择决策实体判 断所述 IMS业务请求用于建立包含 VoIP话音成分的多媒体交互时，进一步指 示所述 S-CSCF实体执行会话分拆处理；所述 S-CSCF实体根据该指示将 VoIP 话音部分转至电路交换网络接续， 将其他部分在 IMS域接续。
8、 如权利要求 5所述的方法， 其特征在于， 所述网络选择决策查询实体 是指网络入口的查询呼叫会话控制功能 I-CSCF实体，或者为被叫用户分配的 服务呼叫会话控制功能 S-CSCF实体， 或者为用户分配的一个应用服务器 AS 实体； 该 S-CSCF实体或 I-CSCF实体或 AS实体在向所述网络选择决策实体 查询当前被叫接续网络选择决策时， 将所述 IMS业务请求的业务类型指示传 递给所述网络选择决策实体， 进而由所述网络选择决策实体根据所述 IMS业 务请求的业务类型指示进行所述判断。
9、 如权利要求 8所述的方法， 其特征在于， 所述业务类型指示是由所述 网络选择决策查询实体根据所收到的 IMS业务请求的方法名和 /或该请求消息 中所携带的会话描述协议 SDP描述， 或业务请求中携带的业务标识确定的一 个具体的业务类型描述。
10、 如权利要求 8所述的方法， 其特征在于， 所述业务类型指示为所述 网络选择决策查询实体所收到的 IMS业务请求， 或经过裁减后的 IMS业务请 求。
11、 一种通信装置， 其特征在于， 包括： 用于接收指向所服务用户的 IP多媒体子系统 IMS业务请求的模块； 用于根据所述 IMS业务请求的业务类型判断是否适合将该业务请求转接 到电路交换网 矣续的模块；
用于在判断结果为是时， 获取当前网络选择决策， 或者在判断结果为否 时， 直接在 IMS域接续被叫用户的模块；
用于接续被叫的模块。'
12、如权利要求 11所述的通信装置， 其特征在于， 该装置为 IMS网络中 的查询呼叫会话控制功能 I-CSCF实体,或者为服务呼叫会话控制功能 S-CSCF 实体， 或者为应用服务器 AS实体。
13、 一种通信装置， 其特征在于， 包括：
用于接收被叫接续网络决策查询请求的模块；
用于根据所述 IMS业务请求的业务类型判断是否适合将该业务请求转接 到电路交换网络接续的模块；
用于在判断结果为是时， 进行当前网络选择决策判断， 或者在判断结果 为否时， 直接决定在 IMS 或接续被叫用户的模块；
用于向请求者发送网络选择决策的模块。
14、 一种网络系统， 其特征在于， 包括：
网络选择决策实体， 用于在网络选择决策查询实体查询时根据网络选择 相关因素进行被叫接续网络选择决策判断；
网络选择决策查询实体， 用于在接收到指向所服务用户的 IMS业务请求 时进行业务类型判断， 并在根据所述业务类型判断该业务请求适合被接续到 电路交换网络时， 向所述网络选择决策实体查询获取当前被叫接续网络选择 决策， 然后按该决策对所述 IMS业务请求进行后续接续处理。
15、 如权利要求 14所述的网络系统， 其特征在于， 所述网络选择决策查 询实体为 IMS网络入口查询呼叫^舌控制功能 I-CSCF实体，或者为为被叫用 户分配的服务呼叫会话控制功能 S-CSCF实体，或者为为被叫用户分配的应用 服务器 AS实体。
16、 如权利要求 15所述的网络系统， 其特征在于， 所述 S-CSCF实体、 I-CSCF实体或 AS实体通过 Diameter接口与所述网络选择决策实体交互； 或 者， 所述 S-CSCF实体通过 IP多媒体业务控制 ISC接口与所述网络选择决策 实体交互。
17、 一种网络系统， 其特征在于， 包括：
网络选择决策查询实体， 用于在接收到指向所服务用户的 IMS业务请求 时， 向网络选择决策实体查询当前被叫接续网络选择决策， 并按该决策对所 述 IMS业务请求进行后续接续处理；
网络选择决策实体， 用于至少根据所述 IMS业务请求的业务类型确定当 前被叫接续网络选择决策并提供给所述网络选择决策查询实体。
18、 如权利要求 17所述的网络系统， 其特征在于， 所述网絡选择决策查 询实体在向网络选择决策实体查询当前被叫接续网络选择决策时， 将所收到 的 IMS业务请求的业务类型指示传递给所述网絡选择决策实体。
19、 如权利要求 17所述的网络系统， 其特征在于， 所述网络选择决策查 询实体为 IMS网絡入口查询呼叫会话控制功能 I-CSCF实体，或者为为被叫用 户分配的服务呼叫会话控制功能 S-CSCF实体，或者为为被叫用户分配的应用 服务器 AS实体。
20、 如权利要求 19所述的网络系统， 其特征在于， 所述 S-CSCF实体或 I-CSCF实体或 AS实体通过 Diameter接口与所述网络选择决策实体交互； 或 者， 所述 S-CSCF实体通过 IP多媒体业务控制 ISC接口与所述网络选择决策 实体交互。
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CN101313542A (zh) 2008-11-26
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CN101001440A (zh) 2007-07-18
EP1959622A1 (en) 2008-08-20

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