WO2009043269A1 - Procédé, système et dispositif pour la transformation de signalisation de commande de conversation - Google Patents

Procédé, système et dispositif pour la transformation de signalisation de commande de conversation Download PDF

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Publication number
WO2009043269A1
WO2009043269A1 PCT/CN2008/072456 CN2008072456W WO2009043269A1 WO 2009043269 A1 WO2009043269 A1 WO 2009043269A1 CN 2008072456 W CN2008072456 W CN 2008072456W WO 2009043269 A1 WO2009043269 A1 WO 2009043269A1
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WO
WIPO (PCT)
Prior art keywords
adaptation unit
session
conversion
ims
signaling
Prior art date
Application number
PCT/CN2008/072456
Other languages
English (en)
French (fr)
Inventor
Dongming Zhu
Hengliang Zhang
Chunyan Ding
Songhai Ye
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 EP17206450.3A priority Critical patent/EP3379792A1/en
Priority to EP16185729.7A priority patent/EP3157224B1/en
Priority to EP08800945.1A priority patent/EP2104304B1/en
Publication of WO2009043269A1 publication Critical patent/WO2009043269A1/zh
Priority to US12/496,061 priority patent/US8279832B2/en

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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
    • H04L65/102Gateways
    • H04L65/1033Signalling gateways
    • H04L65/104Signalling gateways in the network
    • 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
    • H04L65/102Gateways
    • H04L65/1033Signalling gateways
    • H04L65/1036Signalling gateways at the edge
    • 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
    • H04L65/1083In-session procedures
    • 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
    • H04L65/1083In-session procedures
    • H04L65/1095Inter-network session transfer or sharing
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/08Protocols for interworking; Protocol conversion
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M7/00Arrangements for interconnection between switching centres
    • H04M7/12Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal
    • H04M7/1205Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal where the types of switching equipement comprises PSTN/ISDN equipment and switching equipment of networks other than PSTN/ISDN, e.g. Internet Protocol networks
    • H04M7/1225Details of core network interconnection arrangements
    • H04M7/123Details of core network interconnection arrangements where the packet-switched network is an Internet Protocol Multimedia System-type network
    • 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
    • H04L69/00Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/08Protocols for interworking; Protocol conversion
    • H04L69/085Protocols for interworking; Protocol conversion specially adapted for interworking of IP-based networks with other networks

Definitions

  • Embodiments of the present invention relate to the field of communications technologies, and in particular, to access through a circuit domain.
  • IMS IP Multimedia Subsystem
  • MSCs Mobile Switch Centers
  • IMS Media Gateway Control Function
  • IMS interworking can only provide basic session control. There is no way to provide session control and business continuity control for supplementary services by the IMS domain.
  • FIG. 1 A structure for implementing access to an IMS network through a circuit domain in the prior art is shown in FIG. 1 by being connected between a VMSC (Visit Mobile Switch Center) and a UE (User Equipment).
  • An access adaptation unit which intercepts part of the session control signaling between the UE or the radio access network to the VMSC, converts it into SIP (Session Initiation Protocol) signaling, and then forwards it to the IMS.
  • SIP Session Initiation Protocol
  • the access adaptation unit can establish a session bearer by means of the VMSC-MGCF-IMS interworking, or directly control the establishment of the MGW (Medium GateWay) and the bearer of the peer end.
  • the UE in the entire session is connected to the access adaptation unit.
  • a segment between them is called "CS session leg”
  • session control signaling is transmitted by CS signaling
  • IMS session leg a segment between the access adaptation unit and the IMS network
  • session control signaling is SIP. Signaled in the form of a pass.
  • the access adaptation unit needs to maintain some correspondence of session information when the session is established, such as the session identification number of the CS session leg, as in the layer of CS.
  • the transaction identification number of the TI (Transaction Identifier) and the IMS session leg such as the CALL-ID and the remote contact address in the SIP signaling, may be collectively referred to as conversion related information.
  • the CS domain cross-MSC handover (Handover) signaling process is shown in Figure 2: the user equipment establishes a session with the remote user equipment through VMSC-A, and the VMSC-A is responsible for the coordination of all sessions of the user equipment. Control, the user equipment and other peer interactions pass the session control signaling message through the solid line in FIG. 2; when the user equipment moves, thereby switching to the VMSC-B, the session control signaling path changes, the user equipment and the remote end The session control signaling message is transmitted between the networks through the dotted path in FIG. 2, but the VMSC-A is still responsible for the coordination and control of all sessions of the user equipment, and the VMSC-B only transparently transmits the UE and the VMSC-A through the E interface. Session control signaling sent.
  • the embodiments of the present invention provide a method, a system, and a device for converting session control signaling, so as to implement mutual conversion between circuit domain signaling and IMS domain signaling after a cross-MSC handover occurs.
  • the embodiment of the present invention provides a method for session control signaling conversion, where the first adaptation unit is located in a circuit domain signaling path after the MSC handover, and the method includes at least the following One of the steps:
  • the first adaptation unit converts a session control signaling message of a circuit domain session leg into
  • Session control signaling message for the IMS session leg
  • the first adaptation unit translates the session control signaling message of the IMS session leg into a session control signaling message of the circuit domain session leg.
  • the embodiment of the present invention further provides a system for session control signaling conversion, including a user equipment and a session establishment processing node, and further includes:
  • the first adaptation unit located at the session establishment processing node side, and a processing node after the handover in the signaling path between the first adaptation unit and the user terminal, the first adaptation a unit, configured to convert a session control signaling message of the circuit domain session leg into a session control signaling message of the IMS session leg; or the first adaptation unit converts the session control signaling message of the IMS session leg into a circuit domain session Leg session control signaling message;
  • the circuit domain session leg session control signaling message connected to the first adaptation unit is an E interface signaling message; and the IMS domain session leg session control signaling message connected to the first adaptation unit is a SIP message. Order the message.
  • An embodiment of the present invention further provides an adapting unit, including:
  • a conversion related information obtaining subunit configured to acquire, from the second adaptation unit, conversion related information of the circuit domain session leg and the IMS domain session leg;
  • the signaling conversion subunit is connected to the conversion related information acquisition subunit, and is configured to perform signaling conversion between the circuit domain and the IMS domain according to the conversion related information.
  • the embodiment of the present invention further provides a system for session control signaling conversion, including a user equipment, a session establishment processing node, and a post-switching processing node, and further includes:
  • the first adaptation unit is located on the processing node side after the handover,
  • the first adaptation unit is configured to convert a session control signaling message of the circuit domain session leg into a session control signaling message of the IMS session leg; or the first adaptation unit sends session control signaling of the IMS session leg The message is converted into a session control signaling message of the circuit domain session leg;
  • circuit domain session leg session control signaling associated with the first adaptation unit is eliminated
  • the information is an A or Iu interface signaling message;
  • the IMS domain session leg session control signaling message connected to the first adaptation unit is a SIP signaling message.
  • An embodiment of the present invention further provides an adapting unit, including:
  • a conversion related information obtaining subunit configured to acquire conversion related information conversion related information of the circuit domain session leg and the IMS domain session leg;
  • the signaling conversion subunit is connected to the conversion related information acquisition subunit, and is configured to perform signaling conversion between the circuit domain and the IMS domain according to the conversion association information.
  • the embodiment of the present invention intercepts the circuit domain signaling message after the MSC handover by the adaptation unit, and completes the mutual conversion with the IMS domain signaling message, so that the cross-MSC handover can continue to be performed by the IMS domain. Session control. DRAWINGS
  • FIG. 1 is a structural diagram of an implementation of accessing an IMS network through a circuit domain in the prior art
  • FIG. 2 is a schematic diagram of a CS domain cross-MSC handover in the prior art
  • FIG. 3 is a flow chart of Embodiment 1 of the present invention.
  • FIG. 5 is a flowchart of Embodiment 3 of the present invention.
  • Figure 6 is a flow chart of Embodiment 4 of the present invention.
  • Figure 7 is a structural diagram of a system according to Embodiments 1 and 2 of the present invention.
  • FIG. 8 is a structural diagram of a first adapting unit of the embodiment of the present invention
  • FIG. 9 is a structural diagram of a system of the third and fourth embodiments of the present invention.
  • FIG. 10 is a structural diagram of a first adapting unit of the embodiment of the present invention in FIG. 9.
  • FIG. detailed description is a structural diagram of a first adapting unit of the embodiment of the present invention in FIG. 9.
  • the circuit domain signaling is transparently transmitted by the MSC through the E interface to the E interface adaptation unit on the MSC side where the session is established, and is intercepted and converted by the E interface adaptation unit.
  • the user equipment has established a session through the access adaptation unit -A, MSC-A, and the IMS network; the CS session leg identification number of the session is 1; and the identification number of the IMS session leg is CID1.
  • a handover occurs across the MSC, switching from MSC-A to MSC-B; after the handover, the session control signaling message sent by the user equipment arrives in front of the MSC-B through the wireless access system.
  • the access adaptation unit-B is transparently transmitted by the access adaptation unit-B to the MSC-B.
  • the MSC-B does not perform any service control, and directly transmits the message to the MSC-A through the E port, and the MSC-A performs service control.
  • the E-port adaptation unit-A is configured to perform signaling interception on the E-port, and the session control signaling message transparently transmitted by the MSC-B through the E-port is converted and converted into SIP message delivery by the E-port adaptation unit.
  • the access adaptation unit-A or the E-port adaptation unit-A and the IMS network can also be implemented by other means such as US SD (Unstructured) Supplementary Service Data, unstructured supplementary business data) messages are communicated.
  • the E-port adaptation unit in this embodiment is a newly added interface adaptation unit, and the unit performs mutual conversion between the E-channel signaling of the circuit domain and the SIP signaling of the IMS domain according to the session association information of the session in the circuit domain and the IMS domain.
  • the E-port adaptation unit can be deployed independently or in combination with other functional entities (such as MSC or access adaptation unit) and share the same functional components.
  • the specific implementation process is shown in Figure 3, including the following steps:
  • Step s301 the user equipment switches according to a standard CS handover procedure, MSC-A switches to MSC-B.
  • step s302 the user instructs the user equipment to perform call hold on the session 1 by operating the human-machine interface.
  • the user equipment sends a layer 3 message requested by the Hold in the circuit domain, and the TI is set to 1 in the message to indicate that the session 1 is performed.
  • Step s303 At this time, the access adaptation unit -B has no user data, and transparently transmits the Hold request message to the MSC-B through the A port or the Iu port.
  • Step s304 The MSC-B transparently transmits the message to the MSC-A through the E port.
  • Step s305 The E port adaptation unit -A intercepts the message of the E port of the incoming MSC-A.
  • the E-port adaptation unit-A determines that the session request message needs to be routed to the IMS domain, and then converts the HOLD request of the user equipment into a SIP message and sends it to the access adaptation unit-A for forwarding, or the E-port adaptation unit.
  • -A converts the E-port signaling message into a private interface message to the access adaptation unit-A and then forwards it to the SIP by the access adaptation unit-A.
  • the E-port adaptation unit-A can obtain the session correspondence saved during the session establishment from the access adaptation unit-A (such as the session identification number of the CS session leg, such as TI (Transaction Identifier) in the layer 3 signaling of the CS.
  • the related information is the same as the rest of the embodiments, and will not be described again.
  • the E-port adaptation unit-A determines whether the session control message needs to be routed to the IMS processing according to the conversion-related information, and performs adaptation conversion of the signaling.
  • Step s305 can be performed at any time before step s306, and is not limited to the position in Fig. 3.
  • Step s307 The access adaptation unit-A forwards the request message to the IMS domain for processing.
  • the circuit domain signaling and the access adaptation unit-A may also be performed.
  • the E-port adaptation unit-A simply forwards the message to the access adaptation unit-A for processing.
  • Step s308 The service of the IMS domain performs a media negotiation process.
  • Step s310 the access adaptation unit -A transmits the return message to the E port adaptation unit -A according to the handover state for processing.
  • Step s311 The E port adaptation unit -A transmits the circuit domain message that converts the return message to the E port to the MSC-B according to the handover state, and the TI in the circuit domain message is 1.
  • Step s312 The MSC-B does not perform service processing, and the message is transmitted to the access adaptation unit of the wireless access side.
  • Step s313 the access adaptation unit -B intercepting the A port or the Iu port also transparently transmits the message to the wireless access side, and returns to the user equipment. At this point, the call hold process for session 1 is completed.
  • the access adaptation unit-A and the E-port adaptation unit-A may be deployed independently of the MSC-A or may be located in a module in the MSC.
  • Access Adaptation Unit -A, E Port Adaptation Unit -A can be deployed to the same entity and interact with the internal interface; it can also be deployed separately and interact with the external interface.
  • the access adaptation unit-B may be deployed independently of the MSC-B, or may be a module located in the MSC. Of course, the access adaptation unit-B may not be deployed. At this time, the signaling of the user equipment directly reaches the MSC. -B, therefore, whether or not the access adaptation unit-B exists does not affect the effect of the embodiment.
  • the access adaptation unit-B is to perceive that this is a handover, so that the session control signaling message for the session is not converted, but is transparently transmitted to the MSC-B, and then passed by the MSC-B.
  • the E port is transmitted to the E port adapter unit-A.
  • the E-port adaptation unit-B may also exist on the MSC-B side, but the access adaptation unit-B senses the switched session, and thus only transparently transmits signaling without session transition control.
  • the method for sensing the handover may be to intercept the handover notification signaling (such as the HANDOVER REQUEST of the A port or the Iu port, the MAP_PREPARE_HANDOVER of the E port, etc.), or the location update request (Do not receive the location update request). Switch Ways to come over the session.
  • the handover notification signaling such as the HANDOVER REQUEST of the A port or the Iu port, the MAP_PREPARE_HANDOVER of the E port, etc.
  • the location update request Do not receive the location update request.
  • the SIP message on the IMS side can also be directly transmitted to the E-port adaptation unit-A instead of the access adaptation unit-A.
  • the E-port adaptation unit -A or the access adaptation unit -A is required to first notify the IMS domain (such as the notification to the ICCF) that the SIP routing address of the session has changed.
  • the HOLD request message in the circuit domain signaling is received as an example. If the other supplementary service control request message or a new call setup message is received, the same E port adaptation unit is used. -A will convert this request message into IMS domain signaling. The rest of the embodiments are similar to this and will not be described again.
  • the user equipment has established two sessions through the access adaptation unit-A, the MSC-A, and the IMS network, and the two peers, which are identified as session 1 and session 2;
  • the CS session leg identification numbers are 1, 2;
  • the identification numbers of the IMS session legs are CID1 and CID2, respectively. Switching across the MSC occurs due to user equipment movement.
  • Figure 4 The specific process is shown in Figure 4, including the following steps:
  • Step s401 The user equipment establishes two sessions through the access adaptation unit -A, and then initiates handover across the MSC, and switches from MSC-A to MSC-B.
  • the access adaptation unit-A, the E-port adaptation unit-A, and the IMS network may communicate through other means such as USSD messages.
  • Step s404 the access adaptation unit -A returns the SIP to the message port j E port and the hexadecimal L according to the switching state.
  • Step s405 The access adaptation unit-A and the E interface adaptation unit perform conversion related information interaction.
  • Step s406: After the E-port adaptation unit obtains the conversion-related information, the circuit domain message that converts the SIP return message into the E-port is delivered to the MSC-B, where TI 2 in the circuit domain message.
  • Step s407 The MSC-B does not process, and the message is delivered to the wireless access side and returned to the user equipment. After receiving the release message of the session 2, the user equipment continues to complete the subsequent release process of the session.
  • the access adaptation unit-A and the E-port adaptation unit-A may be deployed independently of the MSC-A or may be located in a module in the MSC.
  • Access Adaptation Unit -A, E Port Adaptation Unit -A can be deployed to the same entity and interact with the internal interface; it can also be deployed separately and interact with the external interface.
  • the MSC-B side of the switch may also be configured with the access adaptation unit-B or the E-port adaptation unit-B, but the session control signaling is transparently transmitted to the A side; the adaptation unit-B Whether or not there is an effect that does not affect the embodiment.
  • the SIP message on the IMS side can also be directly transmitted to the E-port adaptation unit-A instead of the access adaptation unit-A.
  • the E-port adaptation unit -A or the access adaptation unit -A is required to first notify the IMS domain (such as the notification to the ICCF) that the SIP routing address of the session has changed.
  • the user equipment has established a session through the access adaptation unit-A, the MSC-A, and the IMS network; the CS session leg identification number of the session is 1; and the identification number of the IMS session leg is CID1.
  • a handover occurs across the MSC.
  • the access adaptation unit-A senses the handover, the information about the CS session leg information and the IMS session leg corresponding to the user equipment is first stored in the IMS of the IMS domain.
  • the access adaptation unit-B then reads the CS session leg information and the IMS session leg and other conversion related information corresponding to the user equipment to the IMS-CS control entity of the IMS domain during the handover process.
  • the session control signaling message sent by the user equipment reaches the access adaptation unit-B located in front of the MSC-B through the wireless access system, and then the access adaptation unit-B performs adaptation to convert the SIP message to The IMS network is controlled.
  • the session control signaling message converted into the A port or the Iu port is also adapted and transmitted by the access adaptation unit-B to the user equipment.
  • the specific implementation process is shown in Figure 5. As shown, the following steps are included:
  • Step s501 After measuring the change of the wireless signal, the user equipment initiates a handover request to the MSC-A through the wireless access side.
  • the access adaptation unit-A intercepts the handover request message of the A interface or the Iu interface, and learns that the user equipment needs to initiate the handover, so all CS session leg information and the IMS session on the user equipment are exchanged through SIP messages.
  • the information related to the conversion of the leg information is saved to an entity for public information exchange, such as an IMS-CS control function entity stored in the IMS domain.
  • the SIP message may be a SIP Info message, and the SDP (Session Description Protocol) carries the user identifier to be saved, the UI information of the CS session leg, the CALL-ID information of the IMS session leg, and various session routing information. And information such as the correspondence between TI and CALL-ID.
  • the access adaptation unit-A saves the conversion related information to the IMS domain, and is not limited to the access adaptation unit-A, which is triggered after receiving the handover request message, and may also detect that the handover adaptation unit-A needs to switch.
  • Appropriate trigger point triggering such as receiving a message such as HO-COMMAND for triggering; it can also be saved to the IMS domain after the session is established (such as receiving CONNECT or 200 OK).
  • Step s503 The IMS-CS control function entity returns the save result to the access adaptation unit -A.
  • Step s504 The access adaptation unit -A transparently transmits the A port or Iu port switching request message from the radio access side to the MSC-A. This step may be performed in parallel with step s502 or in any order.
  • Step s505 the MSC-A initiates a preparation handover request MAP_ PREPARE_ HANDOVER to the handover target MSC-B.
  • Step s506 The MSC-B sends a handover request to the wireless access side controlled by the A port or the Iu port.
  • step s507 the access adaptation unit -B intercepts the handover request message of the A port or the Iu port, and the access adaptation unit -B continues to transparently transmit the request message to the wireless access side through the A port or the Iu port.
  • Step s508 the access adaptation unit-B learns that the user equipment needs to initiate a handover to its location.
  • the corresponding MSC exchanges SIP messages to an entity for public information exchange (such as an IMS-CS control function entity of the IMS domain), and obtains all CS session leg information and IMS session leg information on the user equipment.
  • the SIP message may be a SIP Info message, or other extended SIP message; this step may be performed in parallel with step s507, or in any order.
  • the access adaptation unit-B obtains the conversion related information from the IMS domain, and is not limited to the access adaptation unit-B after receiving the handover request message, and may also detect that the access adaptation unit-B needs to switch. Appropriate trigger point triggering, such as receiving a message such as HO-Complete for triggering.
  • the IMS-CS control function entity returns the save result to the access adaptation unit-B, and carries the user identifier to be acquired, the TI information of the CS session leg, the CALL-ID information of the IMS session leg, and various sessions in the SDP. Routing information, and the correspondence between TI and CALL-ID.
  • step s510 the handover is completed according to the standard CS cross-MSC handover procedure.
  • Steps s511-s512 the user equipment instructs the user equipment to perform call hold on the session 1 through the human-machine interface.
  • the user equipment sends a layer 3 message requested by Hold in the circuit domain, and the TI is 1 in the setup message to indicate that the session is 1
  • the operation is performed; the message is transmitted to the access adaptation unit-B of the A port or the Iu port between the interception radio access network and the MSC-B through the radio access network.
  • Step s514 a service processing process of the IMS domain.
  • the IMS domain returns the processing result to the access adaptation unit-B instead of the access
  • the allocation unit-A is transmitted by the access adaptation unit-B according to the signaling of the session, thereby switching to the access adaptation unit-B; in addition, the access adaptation unit -A or -B may also be Initiating a handover to the IMS domain to notify that the SIP routing address has changed (switching to the new access adaptation unit -B), so that the IMS domain notifies the access to all subsequent session control messages (including new session establishment, etc.) Adaptation unit -B.
  • the various session leg information in this embodiment may be stored in an IMS functional entity such as an HSS or an AS, in addition to the IMS-CS control function entity;
  • the user equipment has established a session through the access adaptation unit-A, the MSC-A, and the IMS network; the CS session leg identification number of the session is 1; the identification number of the IMS session leg is CID1 due to the user.
  • the device moves, and the handover occurs across the MSC.
  • the access adaptation unit-A senses the handover, the information such as the CS session leg information and the IMS session leg corresponding to the user equipment is sent to the target MSC-B to be switched.
  • the access adaptation unit-B after the handover, the access adaptation unit-B saves the session leg information, and the session control signaling message sent by the user equipment reaches the access in front of the MSC-B through the wireless access system.
  • the allocation unit-B is adapted and converted by the access adaptation unit-B into a SIP message for transmission to the IMS network for control.
  • the session control signaling message converted to the A port or the Iu port is also adapted by the access adaptation unit-B and transmitted to the user equipment.
  • the specific implementation process includes the following steps: Step s601: After measuring the change of the wireless signal, the user equipment initiates a handover request to the MSC-A through the wireless access side.
  • the access adaptation unit-A intercepts the handover request message of the A port or the Iu interface, obtains the target cell to be handed over, and obtains the target MSC to be handed over by the corresponding relationship between the neighbor cell information and the MSC number configured in advance. -B, then generate a corresponding PSI number of the access adaptation unit-B according to the target MSC-B number, for example, using the format of "MSC - @PLMN network identity"; the access adaptation unit -A sends the SIP message to the IMS domain Send CS
  • the conversion leg information such as the session leg information and the IMS session leg information, is the PSI number of the constructed access adaptation unit-B.
  • the access adaptation unit-A sends the conversion related information to the access adaptation unit-B.
  • This step is not limited to the access adaptation unit-A triggering after receiving the handover request message, and may also be in the access adaptation unit- A senses other suitable trigger point triggers that need to be switched, such as receiving a message such as HO-COMMAND for triggering.
  • Step s603 the IMS routes the notification message to the access adaptation unit -B according to the number.
  • the SIP message may be a SIP Info message, and carries the user identifier to be saved, the UI information of the CS session leg, the CALL-ID information of the IMS session leg, various session routing information, and the correspondence between the TI and the CALL-ID in the SDP. Relationship and other information.
  • Step s604 the access adaptation unit -A transparently transmits the A port or Iu port switching request message from the radio access side to the MSC-A. This step can be performed in parallel with step s602, or in any order.
  • Step s605 The MSC-A initiates a preparation handover request to the handover target MSC-B.
  • step s606 the handover is completed according to the standard CS cross-MSC handover procedure.
  • Step s607 after the successful handover, the access adaptation unit -B saves information such as the session leg sent by the access adaptation unit -A.
  • Step s608-s609 the user instructs the user equipment to perform call hold on the session 1 through the human-machine interface.
  • the user equipment sends a layer 3 message requested by the Hold in the circuit domain, and the TI in the setting message is 1 to indicate that the session 1 is performed.
  • Step s611 the service processing process of the IMS domain.
  • the IMS domain returns the processing result to the access
  • the allocation unit-B instead of the access adaptation unit-A is switched according to the session by the access adaptation unit-B to switch to the access adaptation unit-B; in addition, it can also be accessed by The adaptation unit -A or B initiates to the IMS domain at the time of handover to notify that the SIP routing address has changed (switched to the new access adaptation unit -B), so that the IMS domain continues to all subsequent session control messages (including new The session establishment and session process notification messages, etc. are all notified to the access adaptation unit -B.
  • the target access adaptation unit- ⁇ may also be connected to the original when switching.
  • the access adaptation unit- ⁇ initiates an information query request, which may be triggered after the access adaptation unit- ⁇ receives the handover request message, and may also trigger at the other suitable trigger point that the access adaptation unit- ⁇ needs to switch. For example, a message such as HO-Complete is received for triggering.
  • the original access adaptation unit-A and the new access adaptation unit-B can also intercept the E interface between the two MSCs, and perform related by extending the E port. Data transfer, such as by extending the MAP-PREPARE-HANDOVER message or other message.
  • the embodiment of the present invention further provides a system for session control signaling conversion, and the system is applicable to the application scenarios of the first embodiment and the second embodiment.
  • the E interface adaptation unit-A in the first embodiment and the second embodiment corresponds to the foregoing.
  • the first adaptation unit, the access adaptation unit-A corresponds to the second adaptation unit.
  • the user equipment or mobile station, the session establishment radio access network (BSS or RAN-A), the session establishment processing node (VMSC-A), and the switched radio access network (BSS or RAN-B) are included. And switching the post-processing node (VMSC-B), the IMS domain, the first adaptation unit, and the second adaptation unit.
  • the second adaptation unit is located on the A port or the Iu interface between the BSS or the RAN-A and the VMSC-A, and communicates with the IMS domain through SIP signaling (which may also be other signaling, such as USSD, etc.);
  • the unit is located at the session establishment processing node side, and is used for performing conversion of circuit domain E interface signaling and IMS domain signaling.
  • the first adaptation unit structure is as shown in FIG.
  • a conversion-related information acquisition sub-unit 10 configured to acquire conversion related information of a circuit domain session leg and an IMS domain session leg, and specifically includes:
  • the allocation unit and the second adaptation unit are located in the same physical entity, and obtain the conversion association information by using an internal interface with the second adaptation unit; or the first adaptation unit and the second adaptation unit are different.
  • the physical entity obtains the conversion association information through an interworking interface with the second adaptation unit;
  • the signaling conversion subunit 20 is connected to the conversion related information acquisition subunit 10, and is configured to convert related information according to the Performing signaling conversion between the circuit domain and the IMS domain, specifically: performing signaling interaction with the IMS domain by using the second adaptation unit; or, notifying the IMS domain, changing the routing address to the first adaptation unit, enabling the IMS
  • the domain switches the connection relationship of the session from the second adaptation unit to the first adaptation unit, and then the first adaptation unit directly performs signaling interaction with the IMS domain.
  • the signaling conversion sub-unit 20 specifically includes: a first signaling interface module 21, configured to perform signaling interaction with the IMS domain by using the second adaptation unit; and a second signaling interface module 22, configured to directly The IMS domain performs the signaling interaction; the third signaling interface module 23 is configured to perform signaling interaction with the circuit domain switching processing node; the notification subunit 24 is configured to notify the IMS domain, and the routing address is changed to the first An adaptation unit that causes the IMS domain to switch the connection relationship of the session from the second adaptation unit to the first adaptation unit.
  • the first signaling interface module 21 and the second signaling interface module 22 may exist at the same time, or only one of them may exist but the other one does not exist; and when the second signaling interface module 22 does not exist, the notification module 24 simultaneously Does not exist.
  • the first adaptation unit When the second adaptation unit is located in the same physical entity as the first adaptation unit, the first adaptation unit further includes an internal interface, configured to acquire a circuit domain session leg and an IMS domain session saved during session establishment. When the second adaptation unit and the first adaptation unit are located in different physical entities, the first adaptation unit further includes an interworking interface, which is used to acquire a circuit domain saved during session establishment. Session leg and IMS domain session leg transition related information.
  • system may further include a third adaptation unit, located on the processing node side after the handover, located at the A port or the Iu port between the user equipment and the post-switching processing node. Knowing that the handover occurs, the signaling conversion function is blocked.
  • FIG. 9 is a schematic structural diagram of a session control signaling conversion system, including a user equipment or a mobile station, a session establishment radio access network (BSS or RAN-A), a session establishment processing node (VMSC-A), and after handover. Radio Access Network (BSS or RAN-B), Post-Handover Processing Node (VMSC-B), IMS domain, first adaptation unit and second adaptation unit.
  • BSS or RAN-A session establishment radio access network
  • VMSC-A session establishment processing node
  • IMS domain IMS domain
  • the second adaptation unit is located on the A port or the Iu interface between the BSS or the RAN-A and the VMSC-A, and communicates with the IMS domain through SIP signaling (which may also be other signaling, such as USSD, etc.);
  • the unit is located on the side of the switching processing node, and is used for converting the circuit domain A port or the Iu port signaling and the IMS domain signaling.
  • the first adaptation unit specifically includes: a conversion related information acquisition subunit 100, configured to acquire conversion related information of a circuit domain session leg and an IMS domain session leg, specifically: an IMS from a user's home location -
  • the CS control function entity acquires; or obtains the data exchange with the second adaptation unit;
  • the signaling conversion subunit 200 is connected to the conversion related information acquisition subunit 100, and is configured to perform circuit domain and according to the conversion related information. Signaling conversion between IMS domains.
  • the conversion related information obtaining subunit 100 specifically includes: a first obtaining module 110, configured to acquire, from the IMS-CS control function entity of the user's home location, conversion related information of the circuit domain session leg and the IMS domain session leg.
  • the second adaptation unit saves the session related information in the IMS-CS control function entity after the session is established; or saves the session related information in the IMS-CS control function entity when the sensing user equipment initiates the cross-MSC handover.
  • the conversion related information acquisition sub-unit 100 may further include: a second obtaining module 120, configured to acquire a circuit domain session leg and an IMS domain session from the second adaptation unit. Information about the conversion of the legs.
  • the second adaptation unit when the handover is initiated, knows the address of the first adaptation unit according to the handover target cell number, and notifies the first adaptation unit of the conversion related information; or the first adaptation list
  • the element learns the address of the second adaptation unit according to the handover source cell number, initiates a query to the address of the second adaptation unit, and obtains conversion related information; or the second adaptation unit and the first adaptation.
  • the unit passes the conversion related information by extending the E port protocol.
  • the circuit domain signaling message after the MSC handover is intercepted by the adaptation unit, and the mutual conversion with the IMS domain signaling message is completed, so that the session can be continuously controlled by the IMS domain after the MSC handover.
  • IMS is a description of 3GPP (3rd Generation Partnership Project), and similarly exists in 3GPP2 and TISPAN (Telecommunications and Internet converged Services and Protocols for Advanced Networking). Multimedia Subsystem; For ease of description in the present invention, only the IMS has been described, but it is obvious that the described method is equally applicable to 3GPP2 and TISPAN systems.
  • the present invention can be implemented by hardware or by software plus necessary general hardware platform.
  • the technical solution of the present invention may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including several The instructions are for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention.

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Description

会话控制信令转换的方法、 系统及设备 技术领域
本发明实施例涉及通信技术领域,尤其涉及一种通过电路域接入
IMS ( IP Multimedia Subsystem, IP 多媒体子系统), 在发生 MSC ( Mobile Switch Center, 移动交换中心)间切换后能继续进行会话控 制信令转换的方法、 系统及设备。 背景技术
在网络向 IMS 演变的过程中, 将会出现 CS ( Circuit Switched domain, 电路域)和 IMS 网络并存的一段时间。 出于降低运营管理 成本的考虑, 运营商可能会希望在 IMS域中集中部署业务, 不管是 通过 CS i或还是通过其他的 IP-CAN ( IP-Connectivity Access Network, IP接入网络)域接入都能访问该业务。 但是, 目前限于已有 ISUP
( Integrated Service User Part,综合业务用户部分)或者 BICC ( Bearer Independent Call Control, 承载无关呼叫控制) 的能力, 通过 MGCF
( Media Gateway Control Function, 媒体网关控制功能)和 IMS互通 的方式只能提供基本会话控制, 没有办法由 IMS域提供补充业务等 的会话控制以及业务连续性控制。
现有技术中一种实现通过电路域接入到 IMS 网络的结构如图 1 所示, 通过在 VMSC ( Visited Mobile Switch Center, 拜访移动交换中 心)和 UE ( User Equipment, 用户设备 )之间串入一个接入适配单 元,该接入适配单元通过截取 UE或无线接入网到 VMSC之间的部分 会话控制信令, 转换为 SIP ( Session Initiation Protocol, 会话发起协 议)信令然后转发到 IMS域中; 或者把 IMS域过来的 SIP信令转换 模拟为电路信令通过接入网络发送到 UE,从而统一在 IMS域中对业 务进行控制。 接入适配单元可以通过 VMSC-MGCF-IMS互通的方式 建立会话承载, 或者直接控制 MGW ( Medium GateWay, 媒体网关) 建立和对端的承载。 如图 1所示, 把整个会话中 UE到接入适配单元 之间的一段叫做 "CS会话腿", 会话控制信令是以 CS信令传递的; 把接入适配单元到 IMS网络之间的一段叫做 "IMS会话腿 ", 会话控 制信令是以 SIP信令的形式传递的。为了在这两个会话腿之间进行信 令的正确适配转换,接入适配单元需要在会话建立时保持一些会话信 息的对应关系, 比如 CS会话腿的会话标识号, 如在 CS的层 3信令 中为 TI ( Transaction Identifier, 事务标识)、 IMS会话腿的会话标识 号, 如在 SIP信令中是 CALL-ID、 以及远端 Contact地址等信息, 这 些信息可统称为转换相关信息。
在原电路域中, CS域跨 MSC切换( Handover )后信令流程如图 2所示:用户设备通过 VMSC-A建立和远端用户设备的会话, VMSC-A 负责该用户设备所有会话的协调和控制,用户设备和其他对端交互通 过图 2中的实线传递会话控制信令消息; 当用户设备发生移动, 从而 切换到 VMSC-B 时, 会话控制信令路径发生变化, 用户设备和远端 网络之间通过图 2中虚线的路径传递会话控制信令消息,但是仍然是 由 VMSC-A负责用户设备所有会话的协调和控制, VMSC-B只是通 过 E接口透传 UE和 VMSC-A之间所发送的会话控制信令。
在实现本发明的过程中, 发明人发现现有技术至少存在以下问 题:
在目前的方案下只能解决用户设备在同一个 MSC时接入 IMS , 在 IMS域进行业务控制的问题,但是当用户设备发生跨 MSC的切换 时就无法完成会话的控制, 无法继续在 IMS域为用户提供业务。 发明内容
本发明实施例提供一种会话控制信令转换的方法、 系统及设备, 以实现发生跨 MSC切换后,可以继续完成电路域信令和 IMS域信令 的相互转换。
本发明实施例提供了一种会话控制信令转换的方法,第一适配单 元位于跨 MSC切换后的电路域信令路径中, 所述方法至少包括以下 步骤之一:
所述第一适配单元将电路域会话腿的会话控制信令消息转换为
IMS会话腿的会话控制信令消息; 或者
所述第一适配单元将 IMS会话腿的会话控制信令消息转换为电 路域会话腿的会话控制信令消息。
本发明实施例还提供了一种会话控制信令转换的系统,包括用户 设备、 会话建立处理节点, 还包括:
第一适配单元, 位于所述会话建立时处理节点侧, 且所述第一适 配单元和所述用户终端之间的信令路径中还存在切换后的处理节点, 所述第一适配单元,用于将电路域会话腿的会话控制信令消息转 换为 IMS会话腿的会话控制信令消息;或者所述第一适配单元将 IMS 会话腿的会话控制信令消息转换为电路域会话腿的会话控制信令消 息;
其中,所述与第一适配单元相连的电路域会话腿会话控制信令消 息为 E口信令消息; 所述与第一适配单元相连的 IMS域会话腿会话 控制信令消息为 SIP信令消息。
本发明实施例还提供了一种适配单元, 包括:
转换相关信息获取子单元,用于从第二适配单元获取电路域会话 腿和 IMS域会话腿的转换相关信息;
信令转换子单元, 与所述转换相关信息获取子单元连接, 用于根 据所述转换相关信息进行电路域和 IMS域之间的信令转换。
本发明实施例还提供了一种会话控制信令转换的系统,包括用户 设备、 会话建立处理节点、 切换后处理节点, 还包括:
第一适配单元, 位于切换后的处理节点侧,
所述第一适配单元,用于将电路域会话腿的会话控制信令消息转 换为 IMS会话腿的会话控制信令消息;或者所述第一适配单元将 IMS 会话腿的会话控制信令消息转换为电路域会话腿的会话控制信令消 息;
其中,所述与第一适配单元相连的电路域会话腿会话控制信令消 息为 A或 Iu口信令消息; 所述与第一适配单元相连的 IMS域会话腿 会话控制信令消息为 SIP信令消息。
本发明实施例还提供了一种适配单元, 包括:
转换相关信息获取子单元, 用于获取电路域会话腿和 IMS域会 话腿的转换关联信息转换相关信息;
信令转换子单元, 与所述转换相关信息获取子单元连接, 用于根 据所述转换关联信息进行电路域和 IMS域之间的信令转换。
与现有技术相比, 本发明实施例通过适配单元拦截跨 MSC切换 后的电路域信令消息并完成和 IMS域信令消息的相互转换, 从而实 现跨 MSC切换后可以继续由 IMS域对会话进行控制。 附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案,下面 将对实施例或现有技术描述中所需要使用的附图作一简单地介绍,显 而易见地, 下面描述中的附图仅仅是本发明的一些实施例, 对于本领 域普通技术人员来讲, 在不付出创造性劳动性的前提下, 还可以根据 这些附图获得其他的附图。
图 1是现有技术中一种实现通过电路域接入到 IMS网络的结构 图;
图 2是现有技术中 CS域跨 MSC切换示意图;
图 3是本发明实施例一的流程图;
图 4是本发明实施例二的流程图;
图 5是本发明实施例三的流程图;
图 6是本发明实施例四的流程图;
图 7是本发明实施例一和二中一种系统的结构图;
图 8是图 7中本发明实施例的第一适配单元的结构图; 图 9是本发明实施例三和四中一种系统的结构图;
图 10是图 9中本发明实施例的第一适配单元的结构图。 具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方 案进行清楚、 完整地描述, 显然, 所描述的实施例仅仅是本发明一部 分实施例, 而不是全部的实施例。 基于本发明中的实施例, 本领域普 通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例, 都属于本发明保护的范围。
本发明实施例一中, 发生 MSC间切换后, 电路域信令由切换后 的 MSC通过 E口透传到会话建立时所在 MSC侧的 E口适配单元, 由 E 口适配单元拦截转换。 用户设备已经通过接入适配单元 -A、 MSC-A以及 IMS网络建立了会话; 该会话的 CS会话腿标识号是 1; IMS会话腿的标识号是 CID1。 由于用户设备(或移动台)移动, 发 生了跨 MSC的切换, 从 MSC-A切换到 MSC-B; 切换后, 用户设备 发出的会话控制信令消息通过无线接入系统到达位于 MSC-B前面的 接入适配单元 -B, 由接入适配单元 -B透传到 MSC-B。 根据电路域跨 MSC切换的流程,此时 MSC-B不做任何业务控制, 直接通过 E口把 消息透传到 MSC-A, 由 MSC-A进行业务控制。 本实施例中增加 E 口适配单元 -A对 E口实施信令拦截,对 MSC-B通过 E口透传过来的 会话控制信令消息由 E 口适配单元进行适配转换为 SIP消息传递到 IMS网络进行控制, 根据接入适配单元和 IMS网络的连接, 除了 SIP 消息外接入适配单元 -A或者 E口适配单元 -A和 IMS网络也可以通过 其他方式比如 US SD ( Unstructured Supplementary Service Data , 非结 构化补充业务数据)消息进行通讯。本实施例中的 E口适配单元为新 增加的接口适配单元, 该单元根据会话在电路域和 IMS域的会话关 联信息, 完成电路域 E口信令和 IMS域 SIP信令的相互转换。 根据 需要, E 口适配单元可以独立部署, 也可以和其他功能实体(比如 MSC 或者接入适配单元)合并部署并共用相同的功能部件。 具体实 施过程如图 3所示, 包括以下步骤:
步骤 s301 , 用户设备按照标准的 CS 切换过程进行切换, 从 MSC-A切换到 MSC-B。
步骤 s302,用户通过操作人机接口,指示用户设备对会话 1进行 呼叫保持, 此时用户设备在电路域发送 Hold请求的层 3消息, 通过 设置该消息中的 TI为 1表示是对会话 1进行操作; 该消息通过无线 接入网传递到拦截无线接入网和 MSC-B之间 A口或者 Iu口的接入适 配单元 -B。
步骤 s303 , 此时接入适配单元 -B没有用户数据, 其通过 A口或 者 Iu口透传该 Hold请求消息到 MSC-B。
步骤 s304 , MSC-B通过 E口往 MSC-A透传该消息。
步骤 s305 , E口适配单元 -A对传入 MSC-A的 E口的消息进行拦 截。
步骤 s306, E口适配单元 -A判断会话请求消息需要路由到 IMS 域则把该用户设备的 HOLD请求转换为 SIP消息并发送到接入适配 单元 -A进行转发, 或者 E口适配单元 -A把 E口信令消息转换为私有 接口消息传递到接入适配单元 -A再由接入适配单元 -A转换为 SIP进 行转发。 E口适配单元 -A可以从接入适配单元 -A获得会话建立时保 存的会话对应关系 (比如 CS会话腿的会话标识号, 如在 CS的层 3 信令中为 TI ( Transaction Identifier, 事务标识)、 IMS会话腿的会话 标识号,如在 SIP信令中是 CALL-ID、 以及远端 Contact地址等信息) 或者其他信息 (比如用户签约信息等), 在此可把这些信息统称为转 换相关信息, 其余实施例与此雷同, 不再赘述。 E口适配单元 -A根据 转换相关信息判断会话控制消息是否需要路由到 IMS处理, 并进行 信令的适配转换。 当 E口适配单元 -A和接入适配单元 -A处于同一个 实体的不同功能模块时 ,可以通过内部接口交互和传递会话信令消息 和转换相关信息; 否则可以通过私有的外部接口 (比如自定义的二进 制 IP接口, 或者扩展的 SIP接口等) 交互这些信息。 步骤 s305可以 在步骤 s306之前的任意时刻执行, 并不限于图 3中位置。
步骤 s307, 接入适配单元 -A转发请求消息到 IMS域进行处理。 步骤 s305-s307中,也可以由接入适配单元 -A进行电路域信令和 IMS域信令的转换, E 口适配单元 -A只是把消息转交给接入适配单 元 -A进行处理。
步骤 s308, IMS域的业务进行媒体协商过程。
步骤 s309 , IMS 向接入适配单元 -A 返回处理结果, 使用 CALL-ID=CID1标识对会话 1。
步骤 s310, 接入适配单元 -A根据切换状态, 把返回消息传递到 E口适配单元 -A进行处理。
步骤 s311 , E口适配单元 -A根据切换状态,把返回消息转换为 E 口的电路域消息传递到 MSC-B , 此时电路域消息中的 TI=1。
步骤 s312, MSC-B不做业务处理, 往无线接入侧的接入适配单 元 -Β传递此消息。
步骤 s313 ,拦截 A口或者 Iu口的接入适配单元 -B同样透传此消 息到无线接入侧, 并返回到用户设备。 至此, 完成了对会话 1的呼叫 保持流程。
本实施例中, 接入适配单元 -A、 E 口适配单元 -A 可以独立于 MSC-A部署, 也可以位于 MSC内的一个模块。 接入适配单元 -A、 E 口适配单元 -A可以是部署到相同的实体中, 釆用内部接口交互; 也 可以独立分开部署, 釆用外部接口进行交互。 所述接入适配单元 -B 可以独立于 MSC-B部署, 也可以是位于 MSC 内的一个模块, 当然 接入适配单元 -B 也可以不部署, 此时用户设备的信令直接到达 MSC-B, 因此接入适配单元 -B是否存在不影响本实施例的效果。
在本实施例中, 接入适配单元 -B要感知这是一个切换, 从而对 于该会话的会话控制信令消息, 不做转换, 而是透传到 MSC-B, 再 由 MSC-B经过 E口透传到 E口适配单元 -A。 同样, MSC-B侧也可 能存在 E口适配单元 -B, 但是和接入适配单元 -B—样感知切换过来 的会话, 从而只是透传信令而不做会话转换控制。 感知切换的方法可 以是通过拦截切换通知信令(比如 A 口或者 Iu 口的 HANDOVER REQUEST, E口的 MAP_PREPARE_HANDOVER等)得知切换, 或 者以不接收到终端的位置更新 (Location Update )请求即默认为切换 过来的会话等方法。
如果接入适配单元 -A和 E口适配单元 -A属于两个不同的物理实 体, IMS侧的 SIP消息也可以直接传递到 E口适配单元 -A而不是接 入适配单元 -A。 在此之前需要 E口适配单元 -A或者接入适配单元 -A 先通知 IMS域(比如通知到 ICCF )会话的 SIP路由地址已经发生变 更。
在本实施例中, 只是以收到了电路域信令中的 HOLD请求消息 为例,如果这时收到的是其余补充业务控制请求消息或者新的呼叫建 立等其他消息, 同样 E口适配单元 -A会将此请求消息转换为 IMS域 信令, 其余实施例与此雷同, 不再赘述。
本发明实施例二中,用户设备已经通过接入适配单元 -A、 MSC-A 以及 IMS网络和两个对端建立了两个会话, 此处标识为会话 1和会 话 2; 这两个会话的 CS会话腿标识号分别是 1、 2; IMS会话腿的标 识号分别是 CID1 , CID2。 由于用户设备移动发生了跨 MSC的切换。 具体过程如图 4所示, 包括以下步骤:
步骤 s401 , 用户设备通过接入适配单元 -A建立了两个会话, 然 后发起跨 MSC的切换, 从 MSC-A切换到了 MSC-B。
步骤 s402- s403 , 在通话过程中, 会话 2的对端用户设备发起会 话释放,此时的 SIP Bye消息会通过 IMS网络传递到接入适配单元 -A, 使用 CALL-ID=CID2标识对会话 2。上述只是以收到了对端的释放会 话的消息为例,如果这时收到了新的呼叫建立请求或者会话过程通知 等消息, 同样 E口适配单元 -A会经过 E口把信息发送到用户设备, 其余实施例与此雷同, 不再赘述。 另外, 根据接入适配单元和 IMS 网络的连接, 除了 SIP消息外接入适配单元 -A、 E 口适配单元 -A和 IMS网络也可以通过其他方式比如 USSD消息进行通讯。
步骤 s404, 接入适配单元 -A根据切换状态, 把该 SIP返回消息 口 j E口 £西己单 L。
步骤 s405 , 接入适配单元 -A与 E口适配单元进行转换相关信息 交互。 步骤 s406, E口适配单元获取转换相关信息后, 把该 SIP返回消 息转换为 E 口的电路域消息传递到 MSC-B, 此时电路域消息中的 TI=2。
步骤 s407, MSC-B不做处理, 往无线接入侧传递此消息, 并返 回到用户设备。 用户设备接收到会话 2的释放消息后, 继续完成会话 的后续释放处理流程。
本实施例中, 接入适配单元 -A、 E 口适配单元 -A 可以独立于 MSC-A部署, 也可以位于 MSC内的一个模块。 接入适配单元 -A、 E 口适配单元 -A可以是部署到相同的实体中, 釆用内部接口交互; 也 可以独立分开部署, 釆用外部接口进行交互。 本实施例中切换后的 MSC-B侧也可以部署接入适配单元 -B, 或者 E 口适配单元 -B, 但此 时会话控制信令都会透传到 A侧; 适配单元 -B是否存在不影响本实 施例的效果。 如果接入适配单元 -A和 E口适配单元 -A属于两个不同 的物理实体, IMS侧的 SIP消息也可以直接传递到 E 口适配单元 -A 而不是接入适配单元 -A。 在此之前需要 E口适配单元 -A或者接入适 配单元 -A先通知 IMS域(比如通知到 ICCF )会话的 SIP路由地址已 经发生变更。
本发明实施例三中,用户设备已经通过接入适配单元 -A、 MSC-A 以及 IMS网络建立了会话; 该会话的 CS会话腿标识号是 1; IMS会 话腿的标识号是 CID1。 由于用户设备移动, 发生了跨 MSC的切换, 接入适配单元 -A感知切换后,首先把该用户设备所对应的 CS会话腿 信息和 IMS会话腿等转换相关信息保存在 IMS域的 IMS-CS控制实 体中; 然后接入适配单元 -B在切换过程中向 IMS域的 IMS-CS控制 实体读取用户设备所对应的 CS会话腿信息和 IMS会话腿等转换相关 信息。 切换后, 用户设备发出的会话控制信令消息通过无线接入系统 到达位于 MSC-B前面的接入适配单元 -B, 然后由接入适配单元 -B进 行适配转换为 SIP消息传递到 IMS网络进行控制。 对于 IMS下发的 SIP会话控制信令消息,同样由接入适配单元 -B适配转换为 A口或者 Iu 口的会话控制信令消息, 传递到用户设备。 具体实施过程如图 5 所示, 包括以下步骤:
步骤 s501 , 用户设备测量无线信号变化后通过无线接入侧向 MSC-A发起切换请求。
步骤 s502,接入适配单元 -A截获该 A口或者 Iu口的切换请求消 息, 得知用户设备需要发起切换, 所以通过 SIP消息交互, 把该用户 设备上所有的 CS会话腿信息和 IMS会话腿信息等转换相关信息保存 到某一个用于公共信息交换的实体上, 比如保存在 IMS域的 IMS-CS 控制功能实体上。 该 SIP 消息可以是一个 SIP Info 消息, 在 SDP ( Session Description Protocol , 会话描述协议 ) 中携带需要保存的用 户标识、 CS会话腿的 ΤΙ信息、 IMS会话腿的 CALL-ID信息、 各种 会话路由信息、 以及 TI和 CALL-ID的对应关系等信息。
其中, 接入适配单元 -A保存转换相关信息到 IMS域, 不限于接 入适配单元 -A接到切换请求消息后触发, 还可以在接入适配单元 -A 感知到需要切换的其他合适触发点触发, 比如收到 HO-COMMAND 等消息进行触发; 也可以在会话建立好之后 (比如收到 CONNECT 或者 200 OK )就保存到 IMS域中。
步骤 s503 , IMS-CS控制功能实体向接入适配单元 -A返回保存结 果。
步骤 s504,接入适配单元 -A把从无线接入侧的 A口或者 Iu口切 换请求消息透传到 MSC-A。 本步骤可以和步骤 s502并行, 或者以任 意顺序执行。
步骤 s505 , MSC-A 向切换目标 MSC-B 发起准备切换请求 MAP— PREPARE— HANDOVER。
步骤 s506, MSC-B通过 A口或者 Iu口向其控制的无线接入侧发 送切换请求。
步骤 s507,接入适配单元 -B截获该 A口或者 Iu口的切换请求消 息, 接入适配单元 -B继续通过 A口或者 Iu口切换请求消息透传到无 线接入侧。
步骤 s508, 接入适配单元 -B得知用户设备需要发起切换到其所 对应的 MSC, 通过 SIP消息交互, 到某一个用于公共信息交换的实 体(比如 IMS域的 IMS-CS控制功能实体), 获取该用户设备上所有 的 CS会话腿信息和 IMS会话腿信息等转换相关信息,该 SIP消息可 以是一个 SIP Info消息, 或者是其他的扩展 SIP消息; 本步骤可以和 步骤 s507并行,或者以任意顺序执行。其中,接入适配单元 -B从 IMS 域获取转换相关信息, 不限于接入适配单元 -B 接到切换请求消息后 触发, 还可以在接入适配单元 -B 感知到需要切换的其他合适触发点 触发, 比如收到 HO-Complete等消息进行触发。
步骤 s509, IMS-CS控制功能实体向接入适配单元 -B返回保存结 果, 在 SDP中携带需要获取的用户标识、 CS会话腿的 TI信息、 IMS 会话腿的 CALL-ID信息、 各种会话路由信息、 以及 TI和 CALL-ID 的对应关系等信息。
步骤 s510, 按照标准的 CS跨 MSC切换流程完成切换。
步骤 s511- s512, 用户设备通过人机接口, 指示用户设备对会话 1进行呼叫保持, 此时用户设备在电路域发送 Hold请求的层 3消息, 通过设置消息中的 TI为 1表示是对会话 1进行操作; 该消息通过无 线接入网传递到拦截无线接入网和 MSC-B之间 A口或者 Iu口的接入 适配单元 -B。
步骤 s513 , 接入适配单元 -B 已经保存有该用户设备切换前的各 种会话腿信息, 发现该 HOLD请求消息需要适配转换到 IMS域进行 控制; 所以, 接入适配单元 -B 根据会话对应关系以及其他信息, 把 该 HOLD请求的电路信令转换为 CALL-ID=CID1的 SIP请消息, 传 递到 IMS域进行处理;该 SIP请求消息可以经过 IMS-CS控制功能实 体也可以不经过 IMS-CS控制功能实体, 不影响本实施例的效果。
步骤 s514, IMS域的业务处理过程。
步骤 s515 , IMS 返回处理结果到接入适配单元 -B , 使用 CALL-ID=CID1标识对会话 1 ; 该 SIP请求消息可以经过 IMS-CS控 制功能实体也可以不经过 IMS-CS控制功能实体, 不影响本实施例的 效果。 其中, IMS域返回处理结果到接入适配单元 -B 而不是接入适 配单元 -A, 是根据该会话的信令由接入适配单元 -B 发送过来的从而 切换到接入适配单元 -B; 另外, 还可以由接入适配单元 -A或 -B在切 换时发起到 IMS域通知 SIP路由地址已经发生了变化(切换到新的 接入适配单元 -B ), 从而 IMS域对后续的所有会话控制消息(包括新 会话建立等)都通知到接入适配单元 -B。
步骤 s516- s517,接入适配单元 -B根据会话对应关系以及其他信 息, 把该 SIP返回消息转换为 A口或者 Iu口的电路域消息传递到无 线接入侧, 并返回到用户设备; 此时电路域消息中的 TI=1 ; 至此, 完成了对会话 1的呼叫保持流程。
本实施例中的各种会话腿信息除了可以保存在 IMS-CS控制功能 实体外, 还可以保存在 HSS或者某个 AS等 IMS功能实体中;
本发明实施例四中,用户设备已经通过接入适配单元 -A、 MSC-A 以及 IMS网络建立了会话; 该会话的 CS会话腿标识号是 1; IMS会 话腿的标识号是 CID1 由于用户设备移动, 发生了跨 MSC的切换, 接入适配单元 -A感知切换后 ,把该用户设备所对应的 CS会话腿信息 和 IMS会话腿等信息发送到将要切换到的目标 MSC-B所对应的接入 适配单元 -B中; 切换后, 接入适配单元 -B保存这些会话腿信息, 用 户设备发出的会话控制信令消息通过无线接入系统到达位于 MSC-B 前面的接入适配单元 -B, 由接入适配单元 -B进行适配转换为 SIP消 息传递到 IMS网络进行控制。 对于 IMS下发的 SIP会话控制信令消 息, 同样由接入适配单元 -B适配转换为 A口或者 Iu口的会话控制信 令消息,传递到用户设备。具体实施过程如图 6所示, 包括以下步骤: 步骤 s601 , 用户设备测量无线信号变化后通过无线接入侧向 MSC-A发起切换请求。
步骤 s602,接入适配单元 -A截获该 A口或者 Iu口的切换请求消 息,得到要切换的目标小区,并通过事先配置的相邻小区信息和 MSC 号的对应关系得到要切换的目标 MSC-B,然后根据目标 MSC-B号生 成对应的接入适配单元 -B的 PSI号码, 比如使用 "MSC - @PLMN 网络标识"的格式; 接入适配单元 -A通过 SIP消息向 IMS域发送 CS 会话腿信息和 IMS会话腿信息等转换相关信息, 目的地址是所构造 的接入适配单元 -B的 PSI号码。 其中, 接入适配单元 -A发送转换相 关信息到接入适配单元 -B, 这一步不限于接入适配单元 -A接到切换 请求消息后触发, 还可以在接入适配单元 -A感知到需要切换的其他 合适触发点触发 , 比如收到 HO-COMMAND等消息进行触发。
步骤 s603 , IMS根据此号码将通知消息路由到接入适配单元 -B。 该 SIP消息可以是一个 SIP Info消息,在 SDP中携带需要保存的用户 标识、 CS会话腿的 Ή信息、 IMS会话腿的 CALL-ID信息、 各种会 话路由信息、 以及 TI和 CALL-ID的对应关系等信息。
步骤 s604,接入适配单元 -A把从无线接入侧的 A口或者 Iu口切 换请求消息透传到 MSC-A。 本步骤可以和步骤 s602并行, 或者以任 意顺序执行。
步骤 s605 , MSC-A向切换目标 MSC-B发起准备切换请求。 步骤 s606, 按照标准的 CS跨 MSC切换流程完成切换。
步骤 s607, 成功切换后, 接入适配单元 -B保存接入适配单元 -A 发送过来的会话腿等信息。
步骤 s608- s609, 用户通过人机接口, 指示用户设备对会话 1进 行呼叫保持, 此时用户设备在电路域发送 Hold请求的层 3消息, 通 过设置消息中的 TI为 1表示是对会话 1进行操作; 该消息通过无线 接入网传递到拦截无线接入网和 MSC-B之间 A口或者 Iu口的接入适 配单元 -B。
步骤 s610, 接入适配单元 -B 已经保存有该用户设备切换前的转 换相关信息, 发现该 HOLD请求消息需要适配转换到 IMS域进行控 制; 所以, 接入适配单元 -B 根据会话对应关系以及其他信息, 把该 HOLD请求的电路信令转换为 CALL-ID=CID1的 SIP请消息, 传递 到 IMS域进行处理。
步骤 s611 , IMS域的业务处理过程。
步骤 s612 , IMS 返回处理结果到接入适配单元 -B , 使用 CALL-ID=CID1标识对会话 1。 其中, IMS域返回处理结果到接入适 配单元 -B而不是接入适配单元 -A是根据该会话的信令是由接入适配 单元 -B 发送过来的从而切换到接入适配单元 -B; 另外, 还可以由接 入适配单元 -A或 B在切换的时候发起到 IMS域通知 SIP路由地址已 经发生了变化(切换到新的接入适配单元 -B ), 从而 IMS域对后续的 所有会话控制消息(包括新会话建立和会话过程通知消息等 )都通知 到接入适配单元 -B。
步骤 s613- s614, 接入适配单元 -B根据转换相关信息, 把该 SIP 返回消息转换为 A口或者 Iu口的电路域消息传递到无线接入侧, 并 返回到用户设备; 此时电路域消息中的 TI=1 ; 至此, 完成了对会话 1 的呼叫保持流程。
本实施例中, 除了原接入适配单元 -Α在切换的时候向目标接入 适配单元 -Β 主动发送转换相关信息, 也可以由目标接入适配单元 -Β 在切换的时候向原接入适配单元 -Α发起信息查询请求, 该请求可以 在接入适配单元 -Β 接到切换请求消息后触发, 还可以在接入适配单 元 -Β感知到需要切换的其他合适触发点触发,比如收到 HO-Complete 等消息进行触发。 另外, 除了通过 SIP通知和查询转换相关信息, 原 接入适配单元 -A和新接入适配单元 -B还可以对两个 MSC之间的 E 口进行拦截, 并通过扩展 E 口进行相关数据传递, 比如通过扩展 MAP— PREPARE— HANDOVER消息或者其他消息进行传递。
本发明实施例还提供了一种会话控制信令转换的系统,该系统是 针对实施例一和实施例二的应用场景,实施例一和实施例二中的 E口 适配单元 -A对应上述中的第一适配单元, 接入适配单元 -A对应第二 适配单元。 如图 7所示, 包括用户设备或者移动台、 会话建立无线接 入网 (BSS或 RAN-A )、 会话建立处理节点 (VMSC-A )、 切换后无 线接入网 (BSS或 RAN-B )、 切换后处理节点 (VMSC-B )、 IMS域、 第一适配单元和第二适配单元。第二适配单元位于 BSS或 RAN-A和 VMSC-A之间的 A口或者 Iu接口上, 通过 SIP信令(也可以是其他 信令, 例如 USSD等)与 IMS域通信; 第一适配单元位于会话建立 处理节点侧, 用于进行电路域 E口信令和 IMS域信令的转换。 其中, 第一适配单元结构如图 8所示, 具体包括: 转换相关信息 获取子单元 10, 用于获取电路域会话腿和 IMS域会话腿的转换相关 信息, 具体包括: 所述第一适配单元和第二适配单元位于同一物理实 体, 通过与所述第二适配单元的内部接口获取所述的转换关联信息; 或者所述第一适配单元和第二适配单元处于不同的物理实体,通过与 所述第二适配单元的互通接口获取所述的转换关联信息;信令转换子 单元 20, 与所述转换相关信息获取子单元 10连接, 用于根据所述转 换相关信息进行电路域和 IMS域之间的信令转换, 具体为: 通过第 二适配单元与 IMS域进行信令交互; 或, 通知所述 IMS域, 路由地 址变更为第一适配单元, 使 IMS域把会话的连接关系从所述第二适 配单元切换到所述第一适配单元,然后第一适配单元直接与所述 IMS 域进行信令交互。
其中, 信令转换子单元 20具体包括: 第一信令接口模块 21 , 用 于通过所述第二适配单元与 IMS域进行信令交互; 第二信令接口模 块 22,用于直接与所述 IMS域进行信令交互;第三信令接口模块 23 , 用于与所述电路域切换后处理节点进行信令交互; 通知子单元 24, 用于通知所述 IMS域, 路由地址变更为第一适配单元, 使 IMS域把 会话的连接关系从所述第二适配单元切换到所述第一适配单元。 其 中, 第一信令接口模块 21和第二信令接口模块 22可以同时存在, 也 可以只存在其中一个而另外一个不存在; 并且当第二信令接口模块 22不存在时, 通知模块 24同时也不存在。
所述第二适配单元与所述第一适配单元位于同一物理实体时,所 述第一适配单元还包括内部接口,用于获取会话建立时所保存的电路 域会话腿和 IMS域会话腿转换相关信息; 所述第二适配单元与所述 第一适配单元位于不同一物理实体时,所述第一适配单元还包括互通 接口, 用于获取会话建立时所保存的电路域会话腿和 IMS域会话腿 转换相关信息。
本实施例中系统中还可能包括第三适配单元,位于切换后处理节 点侧, 位于用户设备与切换后处理节点之间 A口或者 Iu口上, 当感 知到切换发生时, 屏蔽信令转换功能。
本发明实施例还提供了一种会话控制信令转换的系统,该系统是 针对实施例三和实施例四的应用场景,实施例三和实施例四中的接入 适配单元 -B对应上述中的第一适配单元, 接入适配单元 -A对应第二 适配单元。 如图 9所示, 为会话控制信令转换系统的结构示意图, 包 括用户设备或移动台、 会话建立无线接入网 (BSS或 RAN-A )、 会话 建立处理节点 (VMSC-A )、 切换后无线接入网 (BSS或 RAN-B )、 切换后处理节点 (VMSC-B )、 IMS 域、 第一适配单元和第二适配单 元。 第二适配单元位于 BSS或 RAN-A和 VMSC-A之间的 A口或者 Iu接口上,通过 SIP信令(也可以是其他信令,例如 USSD等)与 IMS 域通信; 第一适配单元位于切换后处理节点侧, 用于进行电路域 A 口或者 Iu口信令和 IMS域信令的转换。
所述第一适配单元如图 10所示, 具体包括: 转换相关信息获取 子单元 100,用于获取电路域会话腿和 IMS域会话腿的转换相关信息, 具体为: 从用户归属地的 IMS-CS控制功能实体获取; 或通过与第二 适配单元数据交互获取; 信令转换子单元 200, 与所述转换相关信息 获取子单元 100连接,用于根据所述转换相关信息进行电路域和 IMS 域之间的信令转换。
其中, 转换相关信息获取子单元 100 具体包括: 第一获取模块 110, 用于从用户归属地的 IMS-CS控制功能实体获取电路域会话腿 和 IMS域会话腿的转换相关信息。 其中, 第二适配单元在会话建立 完毕后将会话相关信息保存在 IMS-CS控制功能实体中; 或在感知用 户设备发起跨 MSC切换时将会话相关信息保存在 IMS-CS控制功能 实体中。
当系统中还包括 IMS-CS控制功能实体时, 所述转换相关信息获 取子单元 100具体还可以包括: 第二获取模块 120, 用于从第二适配 单元获取电路域会话腿和 IMS域会话腿的转换相关信息。 所述第二 适配单元在切换发起时根据切换目标小区号得知第一适配单元的地 址, 将所述转换相关信息通知所述第一适配单元; 或所述第一适配单 元在切换时根据切换源小区号得知第二适配单元的地址,向所述第二 适配单元的地址发起查询, 获得转换相关信息; 或所述第二适配单元 和第一适配单元通过扩展 E口协议传递转换相关信息。
本发明的实施例中, 通过适配单元拦截跨 MSC切换后的电路域 信令消息并完成和 IMS域信令消息的相互转换,从而实现跨 MSC切 换后可以继续由 IMS域对会话进行控制。 IMS是 3GPP( 3rd Generation Partnership Project, 第三代伙伴组织) 的描述, 在 3GPP2和 TISPAN ( Telecommunications and Internet converged Services and Protocols for Advanced Networking, 电信和互联网融合业务及高级网络协议 )中同 样存在一个类似的多媒体子系统; 本发明中为了描述简便, 只是针对 IMS进行了描述, 但是很明显所描述的方法同样也适用于 3GPP2和 TISPAN的系统。
通过以上的实施方式的描述,本领域的技术人员可以清楚地了解 到本发明可以通过硬件实现,也可以借助软件加必要的通用硬件平台 的方式来实现。基于这样的理解, 本发明的技术方案可以以软件产品 的形式体现出来, 该软件产品可以存储在一个非易失性存储介质(可 以是 CD-ROM, U盘, 移动硬盘等) 中, 包括若干指令用以使得一 台计算机设备(可以是个人计算机, 服务器, 或者网络设备等)执行 本发明各个实施例所述的方法。
总之, 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。 凡在本发明的精神和原则之内, 所作的任何修改、 等同替换、 改进等, 均应包含在本发明的保护范围之内。

Claims

权利要求
1、 一种会话控制信令转换的方法, 其特征在于, 第一适配单元 位于跨 MSC切换后的电路域信令路径中, 所述方法包括:
所述第一适配单元将电路域会话腿的会话控制信令消息转换为 IMS会话腿的会话控制信令消息; 或者
所述第一适配单元将 IMS会话腿的会话控制信令消息转换为电 路域会话腿的会话控制信令消息。
2、 如权利要求 1所述会话控制信令转换的方法, 其特征在于, 所述第一适配单元位于会话建立时处理节点侧,所述第一适配单元和 所述用户终端之间的信令路径中还存在切换后的处理节点;所述与第 一适配单元相连的电路域会话腿会话控制信令消息为 E口信令消息; 所述与第一适配单元相连的 IMS 域会话腿会话控制信令消息为 SIP 信令消息。
3、 如权利要求 2所述会话控制信令转换的方法, 其特征在于, 所述第一适配单元进行信令转换之前还包括:
所述第一适配单元从第二适配单元获取电路域会话腿和 IMS域 会话腿的转换关联信息。
4、 如权利要求 3所述会话控制信令转换的方法, 其特征在于, 所述第一适配单元从第二适配单元获取所述的转换关联信息至少包 括以下方式之一:
所述第一适配单元和第二适配单元位于同一物理实体,所述第一 适配单元通过与所述第二适配单元的内部接口获取所述的转换关联 信息; 或者
所述第一适配单元和第二适配单元处于不同的物理实体,所述第 一适配单元通过与所述第二适配单元的互通接口获取所述的转换关 联信息。
5、 如权利要求 2所述会话控制信令转换的方法, 其特征在于, 切换后的处理节点侧存在接入适配单元 ,则所述接入适配单元对所有 的电路域会话腿信令进行透传。
6、 如权利要求 2所述会话控制信令转换的方法, 其特征在于, 所述第一适配单元通过下列方式和 IMS域交互会话控制信令消息: 第一适配单元通过第二适配单元与 IMS域进行信令交互; 或 第一适配单元直接与所述 IMS域进行信令交互。
7、 如权利要求 6所述会话控制信令转换的方法, 其特征在于, 所述第一适配单元直接与所述 IMS域进行信令交互之前还包括: 所述第一适配单元或第二适配单元通知所述 IMS域, 路由地址 变更为第一适配单元, 使 IMS域把会话的连接关系从所述第二适配 单元切换到所述第一适配单元。
8、 如权利要求 3至 7任意一项所述会话控制信令转换的方法, 其特征在于,所述第二适配单元是会话建立时所在的处理节点侧的接 入适配单元。
9、 如权利要求 1所述会话控制信令转换的方法, 其特征在于, 所述第一适配单元位于切换后处理节点侧;所述与第一适配单元相连 的电路域会话腿会话控制信令消息为 A口信令消息或者 Iu口信令消 息; 所述与第一适配单元相连的 IMS域会话腿会话控制信令消息为 SIP信令消息。
10、 如权利要求 9所述会话控制信令转换的方法, 其特征在于, 所述第一适配单元进行信令转换之前还包括:
所述第一适配单元获取电路域会话腿和 IMS域会话腿的转换关 联信息。
11、 如权利要求 10所述会话控制信令转换的方法, 其特征在于, 所述第一适配单元获取所述的转换关联信息至少包括下列方式之一: 从用户归属地的 IMS-CS控制功能实体获取; 或
通过与第三适配单元数据交互获取。
12、 如权利要求 11所述会话控制信令转换的方法, 其特征在于, 所述第一适配单元从用户归属地的 IMS-CS控制功能实体获取转换关 联信息之前还包括: 第三适配单元在会话建立完毕后或者感知发生跨 MSC切换时, 将电路域会话腿和 IMS域会话腿转换相关信息保存到用户归属地的 IMS-CS控制功能实体。
13、 权利要求 11所述会话控制信令转换的方法, 其特征在于, 所述通过与所述第三适配单元数据交互获取转换关联信息转换相关 信息具体包括:
所述第三适配单元在切换发起时根据切换目标小区号得知第一 适配单元的地址, 将所述转换相关信息通知所述第一适配单元; 或 所述第一适配单元在切换时根据切换源小区号得知第三适配单 元的地址,向所述第三适配单元的地址发起查询,获得转换相关信息; 或
所述第三适配单元和第一适配单元通过扩展 E 口协议传递转换 相关信息。
14、 如权利要求 9所述会话控制信令转换的方法, 其特征在于, 所述第一适配单元与所述 IMS域进行信令交互之前还包括:
所述第一适配单元或第三适配单元通知所述 IMS域, 路由地址 变更为第一适配单元, 使 IMS域把会话的连接关系从所述第三适配 单元切换到所述第一适配单元。
15、如权利要求 11至 14任意一项所述会话控制信令转换的方法, 其特征在于,所述第三适配单元是会话建立时所在的处理节点侧的接 入适配单元; 或
所述第三适配单元是切换前所在处理节点侧的接入适配单元。
16、 如权利要求 2至 7以及 9至 14任意一项所述会话控制信令 转换的方法, 其特征在于, 所述转换关联信息至少包括下列信息之一 或者其任意组合: 电路域会话标识、 电路域会话的路由信息、 IMS域 会话标识、 IMS域会话的路由信息。
17、 如权利要求 1所述会话控制信令转换的方法, 其特征在于, 所述会话控制消息至少包括下列信息之一: 会话建立消息、会话释放 消息、 会话过程通知消息、 补充业务控制消息。
18、 一种会话控制信令转换的系统, 包括用户设备、 会话建立处 理节点, 其特征在于, 还包括:
第一适配单元, 位于所述会话建立时处理节点侧, 且所述第一适 配单元和所述用户终端之间的信令路径中还存在切换后的处理节点, 所述第一适配单元,用于将电路域会话腿的会话控制信令消息转 换为 IMS会话腿的会话控制信令消息;或者所述第一适配单元将 IMS 会话腿的会话控制信令消息转换为电路域会话腿的会话控制信令消 息;
其中,所述与第一适配单元相连的电路域会话腿会话控制信令消 息为 E口信令消息; 所述与第一适配单元相连的 IMS域会话腿会话 控制信令消息为 SIP信令消息。
19、如权利要求 18所述会话控制信令转换的系统, 其特征在于, 所述第一适配单元具体包括:
转换相关信息获取子单元,用于从第二适配单元获取电路域会话 腿和 IMS域会话腿的转换相关信息;
信令转换子单元, 与所述转换相关信息获取子单元连接, 用于根 据所述转换相关信息进行电路域和 IMS域之间的信令转换。
20、如权利要求 18所述会话控制信令转换的系统, 其特征在于, 切换后处理的节点侧还存在接入适配单元,所述接入适配单元对所有 的电路域会话腿信令进行透传。
21、 一种适配单元, 其特征在于, 包括:
转换相关信息获取子单元,用于从第二适配单元获取电路域会话 腿和 IMS域会话腿的转换相关信息;
信令转换子单元, 与所述转换相关信息获取子单元连接, 用于根 据所述转换相关信息进行电路域和 IMS域之间的信令转换。
22、 如权利要求 21所述适配单元, 其特征在于, 所述信令转换 子单元具体包括:
第一信令接口模块, 用于通过所述第二适配单元与 IMS域进行 信令交互。
23、 如权利要求 21所述适配单元, 其特征在于, 所述信令转换 子单元具体包括:
第二信令接口模块, 用于直接与所述 IMS域进行信令交互; 通知模块, 用于通知所述 IMS域, 路由地址变更为第一适配单 元, 使 IMS域把会话的连接关系从所述二适配单元切换到所述第一 £西己 L。
24、 如权利要求 21所述适配单元, 其特征在于, 所述信令转换 子单元还包括第三信令接口模块,用于与所述电路域切换后处理节点 进行信令交互。
25、 如权利要求 21所述适配单元, 其特征在于, 所述适配单元 包括内部接口,用于所述适配单元与所述第二适配单元位于同一物理 实体时, 获取会话建立时所保存的电路域会话腿和 IMS域会话腿转 换关联信息。
26、 如权利要求 21所述适配单元, 其特征在于, 所述适配单元 包括互通接口,用于所述适配单元与所述第二适配单元位于不同物理 实体时, 获取会话建立时所保存的电路域会话腿和 IMS域会话腿转 换关联信息。
27、 一种会话控制信令转换的系统, 包括用户设备、 会话建立处 理节点、 切换后处理节点, 其特征在于, 还包括:
第一适配单元, 位于切换后的处理节点侧,
所述第一适配单元,用于将电路域会话腿的会话控制信令消息转 换为 IMS会话腿的会话控制信令消息;或者所述第一适配单元将 IMS 会话腿的会话控制信令消息转换为电路域会话腿的会话控制信令消 息;
其中,所述与第一适配单元相连的电路域会话腿会话控制信令消 息为 A或 Iu口信令消息; 所述与第一适配单元相连的 IMS域会话腿 会话控制信令消息为 SIP信令消息。
28、如权利要求 27所述会话控制信令转换的系统, 其特征在于, 所述第一适配单元具体包括: 转换相关信息获取子单元, 用于获取电路域会话腿和 IMS域会 话腿的转换关联信息转换相关信息;
信令转换子单元, 与所述转换相关信息获取子单元连接, 用于根 据所述转换关联信息进行电路域和 IMS域之间的信令转换。
29、 一种适配单元, 其特征在于, 包括:
转换相关信息获取子单元, 用于获取电路域会话腿和 IMS域会 话腿的转换关联信息转换相关信息;
信令转换子单元, 与所述转换相关信息获取子单元连接, 用于根 据所述转换关联信息进行电路域和 IMS域之间的信令转换。
30、 如权利要求 29所述适配单元, 其特征在于, 所述转换相关 信息获取子单元具体包括:
第二获取模块, 用于从用户归属地的 IMS-CS控制功能实体获取 一适配单元中电路域会话腿和 IMS域会话腿的转换相关信息。
31、 如权利要求 29所述适配单元, 其特征在于, 所述转换相关 信息获取子单元具体包括:
第一获取模块,用于通过与所述第三适配单元数据交互获取电路 域会话腿和 IMS域会话腿的转换相关信息。
PCT/CN2008/072456 2007-09-30 2008-09-23 Procédé, système et dispositif pour la transformation de signalisation de commande de conversation WO2009043269A1 (fr)

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EP08800945.1A EP2104304B1 (en) 2007-09-30 2008-09-23 Method and system for transformation of conversation control signaling
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