WO2012130126A1 - 基于ims的控制切换方法及系统 - Google Patents

基于ims的控制切换方法及系统 Download PDF

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Publication number
WO2012130126A1
WO2012130126A1 PCT/CN2012/073065 CN2012073065W WO2012130126A1 WO 2012130126 A1 WO2012130126 A1 WO 2012130126A1 CN 2012073065 W CN2012073065 W CN 2012073065W WO 2012130126 A1 WO2012130126 A1 WO 2012130126A1
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Prior art keywords
ims
user
msc
network element
message
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PCT/CN2012/073065
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English (en)
French (fr)
Inventor
谢振华
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中兴通讯股份有限公司
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Publication of WO2012130126A1 publication Critical patent/WO2012130126A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0011Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H04W36/00224Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]
    • H04W36/00226Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB] wherein the core network technologies comprise IP multimedia system [IMS], e.g. single radio voice call continuity [SRVCC]

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method and system for controlling handover based on an IP Multimedia Core Subsystem (IMS). Background technique
  • IMS IP-based network architecture proposed by the 3rd Generation Partnership Project (3GPP). It builds an open and flexible business environment, supports multimedia applications, and provides users with rich multimedia services.
  • 3GPP 3rd Generation Partnership Project
  • control layer In the IMS, the control layer and the service layer are separated.
  • the control layer generally does not provide specific services, and only provides the necessary triggering, routing, and accounting functions to the service layer.
  • the service triggering and control functions in the control layer are completed by the Call Session Control Function (CSCF).
  • CSCF Call Session Control Function
  • the CSCF can be divided into: proxy call session control function (Proxy-CSCF, P-CSCF), query call session control function (Interrogating-CSCF, I-CSCF) and service call session control function (Serving-CSCF, S-CSCF); The main responsibility is the S-CSCF, and the I-CSCF is optional.
  • the service layer is composed of a series of application servers (ASs), which can provide specific service services.
  • ASs application servers
  • the AS can be an independent entity or exist in the S-CSCF.
  • the S-CSCF controls the service according to the subscription information of the user. Trigger, call the business on the AS to implement business functions.
  • the end-to-end device in the session is called User Equipment (UE), which is responsible for the information exchange between users.
  • UE User Equipment
  • Some UEs have multiple ways to access the wireless network, including packet switching through 3GPP (Packet Switch, PS) access to the wireless network, access to the network through other non-3GPP PS domains, or access to the wireless network through the Circuit Switch (CS) domain Network and so on.
  • 3GPP Packet Switch, PS
  • CS Circuit Switch
  • the eMSC can provide an initial session protocol (SIP) interface to interact with the IMS network.
  • SIP session protocol
  • the UE can only use one access mode at a certain time. If it is performing a call service in the access mode of the 2/3G wireless network, the call service is in 2/.
  • the 3G wireless network is provided by the CS domain.
  • LTE Long Term Evolution
  • HSPA High Speed Packet Access
  • rSRVCC reverse Single Radio Voice Call Continuity
  • Single-standby terminal service continuity referred to as single-standby service connection. Sex.
  • FIG. 1 is a flowchart of a method for implementing an existing rSRVCC, specifically describing that a call is established between UE-1 and UE-2, and UE-1 establishes a call through a CS domain of a 2/3G network, so the UE is connected in the call media path.
  • -1 and UE-2 are media connections of the CS domain; when UE-1 moves to the PS domain of the LTE network or HSPA network whose access mode needs to be changed, the subsequent session passes through the target mobile switching center (Mobile Switching Center)
  • the media anchor of the MSC is anchored to establish a media connection, and the target MSC is not the original MSC.
  • the process of implementing the rSRVCC by the UE-1 includes the following steps:
  • Step 101 UE-1 establishes a session with the UE-2 through the CS domain and the original MSC, and the session signaling path Path MSC and access transfer control function (ATCF) and other IMS network elements, such as CSCF and business continuity AS;
  • Path MSC session signaling path
  • ATCF access transfer control function
  • Step 102 UE-1 sends a measurement report to the base station system of the original network served by the UE-1, and reports the cell signal strength measurement information.
  • Step 103 The base station system of the original network serving the UE-1 sends a handover request to the MSC according to the signal strength information of each cell in the received measurement report, and determines that the target network in the nearby PS domain is more suitable for serving the UE-1. And sending a Handover required message;
  • Step 104 the MSC receives the handover request, and sends a handover command to the base station system of the original network.
  • Step 105 The base station system of the original network sends a handover command to the UE-1, requesting the UE-1 to switch. To the target network;
  • Step 106 After receiving the handover command, UE-1 modulates to the target network for access.
  • Step 107 after step 103, after receiving the handover request from the CS domain, the MSC initiates a transfer request to the ATCF; for example, the ATCF number is The target initiates an INVITE message.
  • the transfer request also carries the handover terminal user association information, where the handover terminal user association information may be the user identification information or the number information of the UE-1, which may be specifically received by the handover request.
  • the International Mobile Subscriber Identity (IMSI) is derived; the ATCF may determine the corresponding terminal user and the session to be transferred according to the handover terminal user association information.
  • IMSI International Mobile Subscriber Identity
  • Step 108 After receiving the transfer request, the ATCF determines that the remote update process needs to be initiated, and sends an update request to the UE-2, for example, sending a relNVITE (re-invitation) message, carrying the media resource information of the access transfer media gateway (ATGW), and the message is The route of the IMS network arrives at the UE-2;
  • the ATCF responds to the transfer request, for example, sends a "200 OK" message, and the transfer response finally arrives at the MSC;
  • Step 111 After step 106, UE-1 initiates a connection establishment message in the target PS domain, For example, sending an INVITE message to the ATCF;
  • Step 112 The ATCF receives the establishment connection message, and responds to the establishment connection message, for example, sends a "200 OK" message, and carries the media resource information of the ATGW;
  • the IMS media connection 2 is established between the UE-1 and the ATGW, and the IMS media connection 1 is established between the ATGW and the UE-2.
  • the ATGW connects the newly created IMS media connection 2 with the newly established IMS media connection 1, so that the UE-1 Can continue to talk to UE-2.
  • the IMS registration of UE-1 must be maintained before the above step 111 can be successfully performed, otherwise the IMS network will consider this to be a request initiated by the user without registration, and thus reject the request, resulting in the UE- 1 In the target PS domain, the existing session cannot be continued, and the handover fails.
  • the step 111 is also rejected by the IMS network, or the user needs to maintain the IMS service. At the time, such as IMS session service, etc., the successful execution of step 111 can be guaranteed.
  • UE-1 cannot successfully perform CS domain to PS domain handover when the IMS registration of the user fails, or the user does not perform IMS registration, or the user's rSRVCC subscription is deleted, and the user's IMS service does not exist.
  • the possibility of switching failures increases, affecting the user experience.
  • the main object of the present invention is to provide an IMS-based control switching method and system, which improves the success rate of the handover operation.
  • An IP Multimedia Subsystem (IMS) based control switching method comprising:
  • the IMS network element notifies the status information of the MSC user of the mobile switching center
  • the MSC indicates, according to the status information of the user, whether the base station system allows the user terminal UE to switch to the packet switched PS domain; or
  • the MSC When the MSC is different from the target MSC, the MSC notifies the target MSC to indicate whether the base station system allows the UE to switch to the PS domain according to the status information of the user;
  • the MSC that the UE provides the service is the target MSC.
  • the IMS network element is an IMS (Contract Management Unit) HSS.
  • rSRVCC reversed-standby service continuity
  • the HSS sends an update message to the MSC.
  • the IMS network element is an IMS session control signaling network element.
  • the IMS network element does not receive the IMS re-registration of the user within a predetermined time, or the timer of the user IMS registration is monitored, the IMS network element is timed out.
  • the status information of the MSC user is notified as follows:
  • the IMS Session Control Signalling Network Element sends a message to the MSC informing the user that the IMS registration has failed.
  • the predetermined time or the duration of the timer is less than or equal to the IMS registration timeout period of the user.
  • the IMS network element is an HSS or an IMS session control signaling network element.
  • the IMS network element determines that the user has performed IMS registration, the IMS network element notifies the MSC user of the status information as:
  • the IMS network element sends a message to the MSC to notify the user that the IMS registration is valid.
  • the IMS network element is an HSS or an IMS session control signaling network element.
  • the IMS network element determines that the IMS registration of the user is logged out, the IMS network element notifies the MSC user of the status:
  • the IMS network element sends a message to the MSC to notify the user that the IMS registration is invalid.
  • the IMS network element is an IMS session control signaling network element.
  • the IMS network element determines the presence status of the IMS service of the user, the IMS network element notifies the status information of the MSC user as:
  • the IMS session control signaling network element sends a message to the MSC to notify the user of the presence status of the IMS service.
  • An IMS-based control switching system including a base station system, the system further includes: an IMS network element, an MSC;
  • An IMS network element configured to notify status information of the MSC user
  • the MSC is configured to indicate, according to the status information of the user, whether the base station system allows the UE to switch to the PS domain.
  • the MSC is divided into an anchor MSC and a target MSC;
  • the anchoring MSC is configured to notify the target MSC whether the base station system allows the UE to switch to the PS domain according to the status information of the user sent by the IMS network element.
  • the MSC currently serving the UE is the target MSC.
  • the IMS network element is specifically an HSS, and is configured to send an update message to the MSC when the rSRVCC subscription information of the user changes.
  • the IMS network element is specifically an IMS session control signaling network element.
  • the IMS session control signaling network element is a call session control function (CSCF), an access transfer control function (ATCF), or an application server (AS). .
  • CSCF call session control function
  • ATCF access transfer control function
  • AS application server
  • the IMS network element is specifically an IMS session control signaling network element, configured to: when the IMS re-registration of the user is not received within a predetermined time, or to monitor that the timer of the user IMS registration times out, send a message to the The MSC notifies the user that the IMS registration is invalid.
  • the IMS network element is specifically an HSS or an IMS session control signaling network element, and is configured to: when it is determined that the user has performed IMS registration, send a message to the MSC, and notify the user that the IMS registration is valid; When it is determined that the IMS registration of the user is logged out, a message is sent to the MSC, and the IMS registration of the user is notified to be invalid.
  • the IMS network element is an IMS session control signaling network element, and is configured to send a message to the MSC to notify the user of the existence status of the IMS service when determining the presence status of the IMS service of the user.
  • the invention acquires the IMS registration status of the user through the IMS network element, and the rSRVCC subscription status, Determining the existence status of the IMS service, and notifying the MSC, the MSC indicates, according to the received user status information, whether the base station system allows the UE to switch to the PS domain, and if not, only performs handover within the CS domain for the UE, The success rate of the UE switching operation improves the user experience.
  • FIG. 1 is a schematic flow chart of a method for implementing rSRVCC in the prior art
  • FIG. 2 is a flowchart of an implementation of an IMS-based control switching method according to the present invention
  • FIG. 3 is a flowchart of an implementation of an IMS-based control switching method according to Embodiment 1 of the present invention
  • FIG. 4 is a flowchart of implementing an IMS-based control switching method according to Embodiment 2 of the present invention
  • FIG. 6 is a flowchart of an implementation of the IMS-based control switching method according to Embodiment 4 of the present invention
  • FIG. 7 is a schematic structural diagram of an IMS-based control switching system according to the present invention. detailed description
  • the IMS network element notifies the status information of the MSC user; the MSC indicates, according to the status information of the user, whether the base station system allows the UE to switch to the PS domain; or, when the target MSC is different from the MSC, The MSC notifies the target MSC to indicate whether the base station system allows the UE to switch to the PS domain according to the status information of the user.
  • the MSC currently serving the UE is the target MSC.
  • FIG. 2 shows an implementation flow of an IMS-based control switching method according to the present invention. As shown in FIG. 2, the method includes the following steps:
  • Step 201 The IMS network element notifies the status information of the MSC user.
  • the IMS network element when the IMS network element detects that the user does not perform IMS registration, or IMS If the registration is invalid, or the user's rSRVCC subscription information is changed, or the user's specific IMS service does not exist, the IMS network element sends a notification message to the anchor MSC of the UE corresponding to the user;
  • the MSC serving the UE may change when the handover is performed in the CS domain.
  • the MSC serving the UE is the anchor MSC, which is recorded as MSCl.
  • the UE is provided.
  • the serving MSC is the target MSC, which is denoted as MSC2.
  • the IMS network element includes an IMS session control signaling network element and an IMS subscription management network element (HSS); and the IMS session control signaling network element is a CSCF, an ATCF, or an AS.
  • HSS IMS subscription management network element
  • Step 202 The MSC indicates, according to the status information of the user, whether the base station system allows the UE to switch to the PS domain. Or, when the target MSC is different from the MSC, the MSC notifies the target MSC to indicate the base station system according to the status information of the user. Whether the UE is allowed to switch to the PS domain; wherein, the MSC currently serving the UE is the target MSC;
  • FIG. 3 shows an implementation process of Embodiment 1 of the IMS-based control switching method provided by the present invention. As shown in FIG. 3, the first embodiment includes the following steps:
  • Step 301 the HSS of the IMS detects whether the user's rSRVCC subscription information has been updated, and when an update occurs, step 302 is performed;
  • the user's rSRVCC subscription information may be updated as follows: The user who has not signed the rSRVCC service is changed to the user who has signed the rSRVCC service, or the user who has signed the rSRVCC service, and changed to the user who cancels the rSRVCC subscription.
  • Step 302 The HSS sends an update message to the MSC1 to notify the MSC1 user that the rSRVCC subscription information has been updated.
  • the MSC1 is an anchor MSC of the UE corresponding to the user whose rSRVCC subscription information is updated, and the HSS may notify the MSC1 user of the rSRVCC by sending a MAP-INSERT-SUBSCRIBER-DATA message.
  • the subscription information is updated.
  • the insertion subscription data message may carry the subscription status information for notification; or, whether the insertion subscription data message carries the indication information, whether the user has the rSRVCC subscription.
  • the subscription status information or the indication information may indicate that the user has or does not have an rSRVCC subscription in an explicit manner; or may be expressed in an implicit manner; wherein, the explicit manner refers to carrying the subscription when the insertion subscription data message is carried.
  • the implicit mode means that when the subscription subscription data message does not carry the subscription status information or the prompt information, it indicates that the user has the rSRVCC subscription.
  • the step 303 is performed.
  • the MSC serving the UE when the UE has performed the handover within the CS domain once, the MSC serving the UE changes.
  • the MSC serving the UE before the UE performs CS domain handover, the MSC serving the UE is an anchor MSC, which is denoted as MSCl; after the CS domain handover, the MSC serving the UE is the target MSC, which is denoted as MSC2.
  • Step 303 The MSC1 notifies the MSC2 whether to allow the UE to switch to the PS domain according to the received update message.
  • the MSC1 can notify the MSC2 whether to allow the UE corresponding to the user to switch to the PS domain according to the rSRVCC subscription status of the user obtained in step 302;
  • the MSC1 may send the forwarding access signaling (MAP_FORWARD_ACCESS_SIGNALLING) message to notify the MSC2 whether to allow the user to switch to the PS domain.
  • the forwarding access signaling message may carry indication information, and notify the MSC2 whether to allow the user to switch to the PS. For example, when the current transfer access signaling message carries the indication information, it indicates that the UE is allowed to switch to the PS domain; or when the current transfer access signaling message carries the indication information, the UE is not allowed to switch to the PS domain. ;
  • the indication information is performed by using an Assignment Request message or a Common ID message included in the AN-APDU field of the Forward Access Signaling message.
  • Carrying, the specific carrying method is the same as the carrying manner of the above prompt information, and will not be described again.
  • Step 304 The MSC1 indicates, according to the obtained rSRVCC subscription status, or the MSC2, according to the obtained indication information, whether the base station system allows the UE to switch to the PS domain.
  • the MSC1 instructs the base station system to allow the UE to switch to the PS domain according to the rSRVCC subscription status obtained in step 302.
  • the MSC2 When the MSC that is currently serving the UE is the MSC2, that is, before the UE has performed the handover in the CS domain, the MSC2 notifies the base station system whether to allow the UE to switch to the PS domain according to the indication information obtained in step 303. ;
  • the MSC1 and the MSC2 can carry the indication information by sending the Assignment Request message or the Common ID message, and the specific carrying manner is the same as the carrying manner of the information indicated in the step 303, and details are not described herein.
  • the base station system determines, according to the indication information in the received message, whether the UE allows the UE to switch to the PS domain when performing the CS domain session, or only allows the UE to perform handover in the CS domain.
  • FIG. 4 is a flowchart of an implementation of the second embodiment of the IMS-based control switching method, where the application scenario of the embodiment is that during the process of establishing a CS domain session by the UE or during a CS domain session, the session signaling is performed.
  • the MSC, the IMS session control signaling network element (such as the ATCF, the CSCF, the AS, etc.) arrives at the remote UE, and the IMS session control signaling network element performs the process of controlling the handover.
  • the second embodiment includes the following Steps:
  • Step 401 The IMS session control signaling network element determines whether the IMS registration status of the user changes according to a preset condition, or determines whether the presence status of the specific IMS service of the user changes. When a change occurs, step 401 is performed. ;
  • the user may perform the IMS registration operation before the session starts. Since the IMS registration operation requires the UE to periodically send an IMS re-registration request to maintain the IMS registration of the user, the UE may not be able to continue to send the IMS during the UE session.
  • IMS will If the IMS session control network element does not receive the IMS re-registration request of the UE within a predetermined time, or if the IMS session control signaling network element detects that the timer of the user IMS registration expires, the IMS session control signaling network element determines The IMS registration status of the user is invalid; here, the predetermined time or the duration of the timer registered by the user IMS may be less than or equal to the IMS registration timeout period of the user; and after the IMS registration of the user fails, the IMS session control signaling network element After receiving the IMS registration message sent by the UE, the IMS session control signaling network element determines that the IMS registration status of the user is valid; where the specific IMS service of the user may be one or more IMS communication services of the user; the specific IMS service of the user The user does not exist.
  • a communication service exists.
  • the IMS session control signaling network element receives the BYE (hang up) message sent by the user or receives BYE message to the user, then a communications business would not exist.
  • the step 401 further includes the IMS session control signaling network element notifying the IMS registration status of the user or the existence status of the specific IMS service of the user.
  • Step 402 The IMS session control signaling unit determines that the status of the user has changed, and sends a message to the MSC1 to notify the MSC1 that the user has a status change.
  • the MSC1 is an anchor MSC of the UE corresponding to the state changed user.
  • the IMS session control signaling network element may send an IMS information (INFO) message, or send an invitation during the session establishment process (INVITE)
  • INFO IMS information
  • ISVITE invitation during the session establishment process
  • the response message of the message for example, the "200 OK" message is used to notify the user status, and specifically, the notification is carried by the status information of the user in the message; or, by the presence or absence of the indication information in the message, the user status is notified.
  • the status information includes registration status information and/or specific IMS service presence status information.
  • Status information or indication information can be used to indicate whether the user has IMS registration and/or If there is a specific IMS service, it can also be expressed in an implicit manner.
  • the information is associated with whether the user has IMS registration and whether there is a specific IMS service, for example, using the forwarding number information as the indication of the registration status. , use the dialog identifier ( Dialog-ID ) as the indication of whether there is a specific IMS service.
  • the step 403 is performed.
  • the MSC serving the UE when the UE has performed the handover in the CS domain once, the MSC serving the UE changes.
  • the MSC serving the UE before the UE performs CS domain handover, the MSC serving the UE is an anchor MSC, which is denoted as MSCl; after the CS domain handover, the MSC serving the UE is the target MSC, which is denoted as MSC2.
  • Step 403 The MSC1 notifies the MSC2 whether to allow the UE to switch to the PS domain according to the status of the user learned in step 402.
  • the MSC1 may send the forward access access signaling (MAP_FORWARD_ACCESS_SIGNALLING) message to notify the MSC2 whether to allow the user to switch to the PS domain.
  • the forward access signaling message may carry indication information, and notify the MSC2 whether to allow the user to switch to the PS. For example, when the current transfer access signaling message carries the indication information, it indicates that the UE is allowed to switch to the PS domain; or when the current transfer access signaling message carries the indication information, the UE is not allowed to switch to the PS domain. ;
  • the carrying information of the indication information is carried by using an Assignment Request message or a Common ID (Common ID) message included in the AN-APDU field of the Forwarding Access Signaling message, and the specific carrying manner is the same as the carrying manner of the foregoing prompt information. No longer.
  • an Assignment Request message or a Common ID (Common ID) message included in the AN-APDU field of the Forwarding Access Signaling message and the specific carrying manner is the same as the carrying manner of the foregoing prompt information. No longer.
  • Step 404 The MSC1 indicates, according to the obtained status of the user, or the MSC2, according to the obtained indication information, whether the base station system allows the UE to switch to the PS domain.
  • the MSC1 indicates, according to the user IMS registration status obtained in step 402, whether the base station system allows the UE to switch to the PS domain.
  • the MSC that is currently serving the UE is the MSC2
  • the MSC2 notifies the base station system whether to allow the UE according to the indication information obtained in step 403. Switch to the PS domain;
  • the MSC1 and the MSC2 can carry the indication information by sending the Assignment Request message or the Common ID message, and the specific carrying manner is the same as the carrying manner of the information indicated in the step 403, and details are not described herein.
  • the base station system determines, according to the indication information in the received message, whether the UE allows the UE to switch to the PS domain when performing the CS domain session, or only allows the UE to perform handover in the CS domain.
  • the IMS session control signaling network element can still follow the above steps to the base station system. Make a notification and switch the control.
  • FIG. 5 is a flowchart of an implementation of the third embodiment of the IMS-based control switching method, where the application scenario of the embodiment is an IMS session control signaling network element (such as ATCF, CSCF, AS, etc.) in the process of performing IMS registration by the MSC. The process of controlling the switching is performed.
  • the third embodiment includes the following steps:
  • Step 501 The MSC1 performs IMS registration, and sends a registration request to the IMS session control signaling network element, where the registration request may be an IMS registration (REGISTER) message;
  • the registration operation is related to the user, wherein the registrant information can be derived from the IMSI of the UE.
  • Step 502 The IMS session control signaling network element determines whether the UE related to the IMS registration message performs IMS registration for the user, and notifies the MSC1 user of the IMS registration status.
  • the MSC1 is the MSC that initiates the registration request, where the IMS session control signaling network element can perform the notification of the user IMS registration status by using a registration response message, such as a "200 OK" message, specifically, the IMS carrying the user in the above message.
  • the registration status information is notified; or, the notification of the user IMS registration status is performed by whether the indication information is carried in the above message.
  • the registration status information or the indication information can express the presence or absence of the user in an explicit manner.
  • the IMS registration may also be expressed in an implicit manner; wherein the information has a one-to-one correspondence with the presence or absence of the IMS registration by the user, for example, using the forwarding number information as the indication information, because the forwarding number information is only when the user has the IMS registration. It will be there if the user does not have IMS registration, and therefore, the notification of the user IMS registration status can be effectively performed.
  • Step 503 The MSC1 indicates, according to the user IMS registration status learned in step 502, whether the base station system allows the UE to switch to the PS domain.
  • the MSC1 may send the forward access access signaling (MAP_FORWARD_ACCESS_SIGNALLING) message to notify the base station system whether to allow the user to switch to the PS domain.
  • the forward access signaling message may carry indication information to notify the base station system whether to allow the user to switch. For example, when the indication information is carried in the current transit access signaling message, the UE is allowed to switch to the PS domain; or the current transit access signaling message carries the indication information, indicating that the UE is not allowed to switch to PS domain;
  • the carrying information of the indication information is carried by using an Assignment Request message or a Common ID (Common ID) message included in the AN-APDU field of the Forwarding Access Signaling message, and the specific carrying manner is the same as the carrying manner of the foregoing prompt information. No longer.
  • an Assignment Request message or a Common ID (Common ID) message included in the AN-APDU field of the Forwarding Access Signaling message and the specific carrying manner is the same as the carrying manner of the foregoing prompt information. No longer.
  • the base station system determines, according to the indication information in the received message, whether the UE allows the UE to switch to the PS domain when performing the CS domain session, or only allows the UE to perform handover in the CS domain.
  • FIG. 6 is a flowchart of an implementation of the IMS-based control switching method, where the application scenario of the embodiment is that the IMS session control signaling network element controls the handover process after the operator cancels the IMS of the user, for example,
  • the fourth embodiment includes the following steps, where steps 601-602 and 603 can be performed simultaneously or alternatively:
  • Step 601 When the operator logs out the IMS registration of the user, the HSS sends a logout notification to the S-CSCF in the IMS session control signaling network element.
  • Step 602 The S-CSCF of the IMS session control signaling network element notifies the MSC1 user of the IMS registration status.
  • the MSC1 is an anchor MSC of the UE corresponding to the user whose registration status is deactivated, and the IMS session control signaling network element may notify by sending an IMS information (INFO) message or a message (MESSAGE) message, specifically, by using the above
  • INFO IMS information
  • MESSAGE message
  • the message carries the IMS registration status information of the user for notification; or, whether the indication information is carried in the message, the notification of the user IMS registration status is performed.
  • the registration status information or the indication information may indicate whether the user has an IMS registration in an explicit manner, or may be expressed in an implicit manner; wherein the information has a one-to-one correspondence with the presence or absence of the IMS registration by the user, for example,
  • the transfer number information is used as the indication information, because the transfer number information is only available when the user has the IMS registration, and the user does not have the IMS registration. Therefore, the notification of the user IMS registration status can be effectively performed.
  • the registration status information is displayed as invalid for the user IMS registration.
  • the S-CSCF may also send the De-ReGISTER message received in step 601 to the ATCF, and the ATCF may perform step 602; or the ATCF may also send a De-REGISTER message to the P-CSCF. Step 602 is performed by the P-CSCF.
  • the step 604 is performed.
  • the MSC serving the UE may be changed.
  • the UE provides the serving MSC as the anchor MSC, which is denoted as MSCl; after the CS domain handover, the MSC serving the UE is the target MSC, which is denoted as MSC2.
  • Step 603 When the operator logs out the IMS registration of the user, the HSS notifies the MSC1 user of the IMS registration status, such as the Insert Subscriber Data. Otherwise, when the MSCl is not the MSC currently serving the UE, Need to perform steps In the embodiment of the present invention, when the UE has performed the handover in the CS domain once, the MSC serving the UE is changed. Here, before the UE performs the CS domain handover, the UE is served as the anchor MSC. It is recorded as MSCl; after CS domain handover, the MSC serving the UE is the target MSC, which is denoted as MSC2.
  • Step 604 The MSC1 notifies the MSC2 whether to allow the UE to switch to the PS domain according to the user IMS registration status obtained in step 602 and/or step 603;
  • the MSC1 may send the forward access access signaling (MAP_FORWARD_ACCESS_SIGNALLING) message to notify the MSC2 whether to allow the user to switch to the PS domain.
  • the forward access signaling message may carry indication information, and notify the MSC2 whether to allow the user to switch to the PS. For example, when the current transfer access signaling message carries the indication information, it indicates that the UE is allowed to switch to the PS domain; or when the current transfer access signaling message carries the indication information, the UE is not allowed to switch to the PS domain. ;
  • the carrying information of the indication information is carried by using an Assignment Request message or a Common ID (Common ID) message included in the AN-APDU field of the Forwarding Access Signaling message, and the specific carrying manner is the same as the carrying manner of the foregoing prompt information. No longer.
  • an Assignment Request message or a Common ID (Common ID) message included in the AN-APDU field of the Forwarding Access Signaling message and the specific carrying manner is the same as the carrying manner of the foregoing prompt information. No longer.
  • Step 605 The MSC1 indicates, according to the obtained user IMS registration status, or the MSC2, according to the obtained indication information, whether the base station system allows the UE to switch to the PS domain.
  • the MSC1 instructs the base station system to allow the UE to switch to the PS domain according to the user IMS registration status obtained in step 602 and/or step 603;
  • the MSC2 If the MSC that is currently serving the UE is the MSC2, that is, before the UE has performed the handover between the CS domain and the CS domain, the MSC2 notifies the base station system whether to allow the UE according to the indication information acquired in step 604. Switch to the PS domain;
  • the MSC1 and the MSC2 can carry the indication information by sending an Assignment Request message or a Common ID message, and the specific carrying manner and the prompt message in step 604 The information is carried in the same way and will not be described again.
  • the base station system determines, according to the indication information in the received message, whether the UE allows the UE to switch to the PS domain when performing the CS domain session, or only allows the UE to perform handover in the CS domain.
  • the de-registration (De-REGISTER) message in step 601 may also be sent by the P-CSCF or the S-CSCF.
  • the ATCF or the AS in the IMS session control signaling network element will receive.
  • the IMS session control signaling network element can still notify the base station system according to the above step 602 and steps 604-605 to the de-REGISTER message, and the base station system performs control switching on the UE.
  • FIG. 7 is a schematic diagram showing the structure of an IMS-based control switching system. As shown in FIG. 7, the system includes: an IMS network element, an MSC, and a base station system;
  • the IMS network element is used to notify the MSC user of the status information.
  • the IMS network element detects that the MSC user does not perform IMS registration, or the IMS registration fails, or the user's rSRVCC subscription information is changed, or the user's specific IMS service exists or If not exists, the IMS network element sends a notification message to the MSC;
  • the MSC is configured to indicate, according to the status information of the user, whether the base station system allows the UE to switch to the PS domain.
  • the MSC can be divided into an anchor MSC and a target MSC;
  • the anchor MSC is configured to notify the target MSC whether the base station system allows the UE to switch to the PS domain according to the status information of the user sent by the IMS network element; wherein, the MSC currently serving the UE is the target MSC, when When the UE has performed a handover in the CS domain, the MSC serving the UE may be changed.
  • the MSC serving the UE is the anchor MSC; after the CS domain handover, the UE is served.
  • the MSC is the target MSC.
  • the IMS network element is specifically an HSS, and is configured to send an update message to the MSC when the rSRVCC subscription information of the user is changed.
  • the IMS network element is specifically an IMS session control signaling network element.
  • the IMS session control signaling network element is a CSCF, an ATCF, or an AS.
  • the IMS network element is specifically an IMS session control signaling network element, configured to: when the IMS re-registration of the user is not received within a predetermined time, or to monitor that the timer of the user IMS registration times out, send a message to the The MSC, to notify the user that the IMS registration is invalid.
  • the IMS network element is specifically an HSS or an IMS session control signaling network element, and is configured to: when it is determined that the user has performed IMS registration, send a message to the MSC, to notify the user that the IMS registration is valid; When the IMS registration of the user is deregistered, a message is sent to the MSC, informing the user that the IMS registration is invalid.
  • the IMS network element is an IMS session control signaling network element, and is configured to send a message to the MSC to notify the user of the existence status of the IMS service when determining the presence status of the IMS service of the user.

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Abstract

本发明提供了一种基于IMS的控制切换方法及系统,其中,所述方法包括下述步驟:IMS网元通知MSC用户的状态信息;MSC根据所述用户的状态信息,指示基站系统是否允许UE切换到PS域;或,当所述MSC与目标MSC不同时,所述MSC根据所述用户的状态信息,通知目标MSC指示基站系统是否允许UE切换到PS域。本发明通过IMS网元监测用户的IMS注册状态、rSRVCC签约状态、特定IMS业务的存在状态的更新,并通知给MSC,由MSC根据接收到的UE状态信息,指示基站系统是否允许该UE切换到PS域,若不能,则只针对UE进行CS域内的切换,提高了UE切换操作的成功率,提升了用户的使用体验。

Description

基于 IMS的控制切换方法及系统 技术领域
本发明涉及通信技术领域, 尤其涉及一种基于 IP 多媒体子系统 (IP Multimedia Core Network Subsystem , IMS ) 的控制切换方法及系统。 背景技术
IMS 是由第三代合作伙伴计划 ( 3rd Generation Partnership Project, 3GPP )提出的一种基于 IP的网络架构, 构建了一个开放灵活的业务环境, 支持多媒体应用, 能够为用户提供丰富的多媒体业务。
在 IMS中,控制层和业务层是分离的,控制层一般不提供具体的业务, 只向业务层提供必要的触发、 路由、 计费等功能。
控制层中业务触发和控制功能是呼叫会话控制功能 (Call Session Control Function, CSCF ) 完成的。 CSCF可以分为: 代理呼叫会话控制功 能(Proxy-CSCF, P-CSCF )、 查询呼叫会话控制功能( Interrogating-CSCF, I-CSCF )和服务呼叫会话控制功能( Serving-CSCF, S-CSCF ); 其中负主要 责任的是 S-CSCF, I-CSCF是可选的。
业务层是由一系列应用服务器( Application Server, AS )组成, 能够提 供具体的业务服务, AS 可以是独立的实体, 也可以存在于 S-CSCF 中; S-CSCF根据用户的签约信息控制业务的触发, 调用 AS上的业务, 实现业 务功能。
会话中的端到端设备称为用户设备 ( User Equipment , UE ), 负责使用 者之间信息的交互,有的 UE具有多种接入无线网络的方式,包括通过 3GPP 的包交换 ( Packet Switch, PS )域接入无线网络、 通过其他非 3GPP的 PS 域接入网络、 或者可以通过电路交换 ( Circuit Switch, CS )域接入无线网 络等等。
如果 CS域的网络配置有增强移动交换中心 (enhanced Mobile Switch Center, eMSC ), 则可由 eMSC提供初始会话协议( Session Initial Protocol, SIP )接口与 IMS网络进行交互, 如此, IMS网络与 CS域的网络的交互可 以通过 eMSC来实现。
对于具有多种接入方式的 UE来说,该 UE某时刻只能使用一种接入方 式, 如果其在 2/3G无线网络的接入方式下正在执行通话业务时, 因通话业 务在 2/3G无线网络中由 CS域提供, 当 UE移动到其他地方, 需要改变其 使用的接入方式时, 如需要将其接入方式改变为长期演进(Long Term Evolution, LTE ) 网络或高速分组接入( High Speed Packet Access , HSPA ) 网络接入时, 此时, UE和网络能提供某种方式使 UE正在执行的通话业务 不被中断, 又因通话业务在 LTE网络或 HSPA网络中由 PS域提供,这样的 能力称之为反向单待终端业务连续性, 简称反向单待业务连续性 (reverse Single Radio Voice Call Continuity, rSRVCC ); 与之相对应的, 如果是 UE 从 LTE网络或 HSPA网络移动到 2/3G网络,而保持正在执行的通话业务不 被中断, 这样的能力则称之为单待终端业务连续性, 简称为单待业务连续 性。
图 1为现有的 rSRVCC实现方法的流程图, 具体描述了 UE-1和 UE-2 间建立了通话, UE-1是通过 2/3G网络的 CS域建立通话, 因此通话媒体路 径中连接 UE-1和 UE-2的是 CS域的媒体连接; 当 UE-1移动到需要改变其 使用的接入方式为 LTE网络或 HSPA网络的 PS域时,后续会话通过目标移 动交换中心 ( Mobile Switching Center, MSC ) 的媒体锚定建立媒体连接, 且目标 MSC不是原来 MSC的情况下, UE-1实现 rSRVCC的过程包括下述 步驟:
步驟 101 , UE-1通过 CS域及原 MSC与 UE-2建立会话, 会话信令路 径途径 MSC以及访问转移控制功能( ATCF )和其他 IMS网元, 如 CSCF 和业务连续性 AS等;
步驟 102, UE-1向为其服务的原网络的基站系统发送测量报告, 以上 报小区信号强度测量信息;
步驟 103, 为 UE-1服务的原网络的基站系统根据接收到的测量报告中 各小区信号强度信息, 判断得到附近 PS域的目标网络更适合为 UE-1服务 时, 则向 MSC发送切换请求, 如发送 Handover required (切换请求 )消息; 步驟 104, MSC接收到切换请求, 向原网络的基站系统发送切换命令; 步驟 105, 原网络的基站系统向 UE-1发送切换命令, 要求 UE-1切换 到目标网络;
步驟 106, UE-1接收到切换命令后, 调制到目标网络进行接入; 步驟 107, 步驟 103后, MSC收到来自 CS域的切换请求后, 向 ATCF 发起转移请求; 比如以 ATCF的号码为目标发起 INVITE (邀请 ) 消息; 该转移请求中还携带有切换终端用户关联信息, 该切换终端用户关联 信息可以是 UE-1的用户标识信息或号码信息,具体可以通过收到的切换请 求中的国际移动用户识别码(IMSI )推导得到; ATCF可以根据所述切换终 端用户关联信息确定对应的终端用户及需要转移的会话。
步驟 108: ATCF 收到转移请求后, 判断需要发起远端更新流程, 向 UE-2发送更新请求, 比如发送 relNVITE (重邀请 )消息, 携带访问转移媒 体网关(ATGW ) 的媒体资源信息, 消息经 IMS网络的路由到达 UE-2; 步驟 109: UE-2收到更新请求, 响应更新请求, 比如发送 "200 OK" 消息, 该消息携带 UE-2的媒体资源信息、 经 IMS网络的路由到达 ATCF; 步驟 110、 ATCF响应转移请求, 比如发送 "200 OK" 消息, 转移响应 最终到达 MSC;
步驟 111: 在步驟 106之后, UE-1在目标 PS域发起建立连接消息, 比 如发送 INVITE消息给 ATCF;
步驟 112: ATCF收到建立连接消息, 应答该建立连接消息, 比如发送 "200 OK" 消息, 携带 ATGW的媒体资源信息;
至此, UE-1与 ATGW间建立起 IMS媒体连接 2, ATGW与 UE-2间建 立起 IMS媒体连接 1 , ATGW将新建的 IMS媒体连接 2与新建的 IMS媒体 连接 1接起来, 使 UE-1能继续与 UE-2通话。
然而, 在现有技术中, UE-1的 IMS注册必须保持住, 才能够成功执行 上述步驟 111 , 否则 IMS网络会认为这是一个没有注册的用户发起的请求, 因而拒绝该请求, 导致 UE-1在目标 PS域无法继续已有的会话而导致切换 失败; 另外, 当用户在进行会话过程中, 网络删除了用户的 rSRVCC签约, 步驟 111也会被 IMS网络拒绝, 或者用户需要保持住 IMS业务时, 如 IMS 会话业务等, 才能保证步驟 111的成功执行。 总之, 当用户的 IMS注册失 效后, 或用户没有执行 IMS注册, 或用户的 rSRVCC签约被删除、 用户的 IMS业务不存在等情况下, UE-1是不能够成功进行 CS域到 PS域的切换的, 使切换失败的可能性增大, 影响用户体验。 发明内容
有鉴于此, 本发明的主要目的在于提供一种基于 IMS的控制切换方法 及系统, 提高了切换操作的成功率。
为达到上述目的, 本发明的技术方案是这样实现的:
一种基于 IP多媒体子系统(IMS ) 的控制切换方法, 所述方法包括:
IMS网元通知移动交换中心 MSC用户的状态信息;
所述 MSC根据所述用户的状态信息,指示基站系统是否允许用户终端 UE切换到包交换 PS域; 或,
当所述 MSC与目标 MSC不同时,所述 MSC根据所述用户的状态信息, 通知目标 MSC指示基站系统是否允许 UE切换到 PS域; 其中, 当前为所 述 UE提供服务的 MSC为目标 MSC。
其中, 所述 IMS网元为 IMS (签约管理单元) HSS, 当用户的反向单 待业务连续性(rSRVCC )签约信息发生更改时, 所述 IMS网元通知 MSC 用户的状态信息为:
HSS发送更新消息给所述 MSC。
其中,所述 IMS网元为 IMS会话控制信令网元, 当 IMS网元在预定的 时间内未收到用户的 IMS重注册, 或监测到用户 IMS注册的定时器超时, 所述 IMS网元通知 MSC用户的状态信息为:
IMS会话控制信令网元发送消息至所述 MSC,通知所述用户的 IMS注 册失效。
优选地, 所述预定的时间或所述定时器的时长小于或等于所述用户的 IMS注册超时时间。
其中, 所述 IMS网元为 HSS或 IMS会话控制信令网元, 当 IMS网元 判断得到所述用户进行过 IMS注册时, 所述 IMS网元通知 MSC用户的状 态信息为:
所述 IMS网元发送消息至所述 MSC, 通知用户的 IMS注册有效。 其中, 所述 IMS网元为 HSS或 IMS会话控制信令网元, 当所述 IMS 网元判断得到用户的 IMS注册被注销时, 所述 IMS网元通知 MSC用户的 状态为:
所述 IMS网元发送消息至所述 MSC, 通知所述用户的 IMS注册失效。 其中,所述 IMS网元为 IMS会话控制信令网元, 当 IMS网元判断得到 所述用户的 IMS业务的存在状态时, 所述 IMS网元通知 MSC用户的状态 信息为:
IMS会话控制信令网元发送消息至所述 MSC,通知用户的 IMS业务的 存在状态。 一种基于 IMS的控制切换系统, 包括基站系统,所述系统还包括: IMS 网元、 MSC; 其中,
IMS网元, 用于通知 MSC用户的状态信息;
MSC, 用于根据用户的状态信息, 指示所述基站系统是否允许 UE切 换到 PS域。
其中, 所述 MSC分为锚定 MSC和目标 MSC;
所述锚定 MSC, 用于根据 IMS网元发送的用户的状态信息, 通知目标 MSC指示基站系统是否允许 UE切换到 PS域; 其中, 当前为所述 UE提供 服务的 MSC为目标 MSC。
其中, 所述 IMS网元具体为 HSS, 用于当用户的 rSRVCC签约信息发 生更改时, 发送更新消息给所述 MSC。
其中, 所述 IMS网元具体为 IMS会话控制信令网元; 其中, 所述 IMS 会话控制信令网元为呼叫会话控制功能( CSCF )、访问转移控制功能( ATCF ) 或应用服务器(AS )。
其中, 所述 IMS网元具体为 IMS会话控制信令网元, 用于在预定的时 间内未收到用户的 IMS重注册, 或监测到用户 IMS注册的定时器超时时, 发送消息至所述 MSC, 通知所述用户的 IMS注册失效。
其中, 所述 IMS网元具体为 HSS或 IMS会话控制信令网元, 用于当 判断得到所述用户进行过 IMS注册时, 发送消息至所述 MSC, 通知所述用 户的 IMS注册有效; 当判断得到用户的 IMS注册被注销时, 发送消息至所 述 MSC, 通知所述用户的 IMS注册失效。
其中, 所述 IMS网元为 IMS会话控制信令网元, 用于当判断得到所述 用户的 IMS业务的存在状态时, 发送消息至所述 MSC, 通知用户的 IMS 业务的存在状态。
本发明通过 IMS网元对用户的 IMS注册状态、 rSRVCC签约状态, 特 定 IMS业务的存在状态进行判断, 并通知给 MSC, 由 MSC根据接收到的 用户状态信息, 指示基站系统是否允许该 UE切换到 PS域, 若不能, 则只 针对 UE进行 CS域内的切换, 提高了 UE切换操作的成功率, 提升了用户 的使用体验。 附图说明
图 1为现有技术中 rSRVCC实现方法的流程示意图;
图 2为本发明基于 IMS的控制切换方法的实现流程图;
图 3为本发明基于 IMS的控制切换方法实施例一的实现流程图; 图 4为本发明基于 IMS的控制切换方法实施例二的实现流程图; 图 5为本发明基于 IMS的控制切换方法实施例三的实现流程图; 图 6为本发明基于 IMS的控制切换方法实施例四的实现流程图; 图 7为本发明基于 IMS的控制切换系统的结构示意图。 具体实施方式
本发明的基本思想为: IMS网元通知 MSC用户的状态信息; MSC根 据所述用户的状态信息, 指示基站系统是否允许 UE切换到 PS域; 或, 当 目标 MSC与所述 MSC不同时,所述 MSC根据所述用户的状态信息,通知 目标 MSC指示基站系统是否允许 UE切换到 PS域; 其中, 当前为所述 UE 提供服务的 MSC为目标 MSC。
为使本发明的目的、 技术方案和优点更加清楚明白, 以下举实施例并 参照附图, 对本发明进一步详细说明。
图 2示出了本发明基于 IMS的控制切换方法的实现流程,如图 2所示, 所述方法包括下述步驟:
步驟 201 , IMS网元通知 MSC用户的状态信息;
具体地,本步驟中,当 IMS网元检测到用户没有执行 IMS注册、或 IMS 注册失效、 或用户的 rSRVCC签约信息被更改、 或用户的特定 IMS业务不 存在的情况下, IMS 网元会发送通知消息给所述用户对应的 UE 的锚定 MSC; 其中, 当 UE已经进行过一次 CS域内的切换时, 为 UE提供服务的 MSC会发生变更; 这里, UE在 CS域内进行切换之前, 为 UE提供服务的 MSC为锚定 MSC,记为 MSCl; CS域内切换之后,为 UE提供服务的 MSC 为目标 MSC, 记为 MSC2。
其中, IMS 网元包括 IMS 会话控制信令网元和 IMS 签约管理网元 ( Home Subscriber Server, HSS ); IMS会话控制信令网元为 CSCF、 ATCF、 或 AS。
步驟 202, MSC根据用户的状态信息, 指示基站系统是否允许 UE切 换到 PS域; 或, 当目标 MSC与所述 MSC不同时, 所述 MSC根据所述用 户的状态信息, 通知目标 MSC指示基站系统是否允许 UE切换到 PS域; 其中, 当前为所述 UE提供服务的 MSC为目标 MSC;
图 3示出了本发明提供的基于 IMS的控制切换方法实施例一的实现流 程, 如图 3所示, 所述实施例一包括下述步驟:
步驟 301 , IMS的 HSS检测用户的 rSRVCC签约信息是否发生了更新, 当发生了更新, 则执行步驟 302;
这里, 用户的 rSRVCC 签约信息发生的更新可以为: 原先没有签约 rSRVCC业务的用户,变更为签约了 rSRVCC业务的用户、或已签约 rSRVCC 业务的用户, 变更为取消 rSRVCC签约的用户等等。
步驟 302, HSS发送更新消息给 MSC1 , 以通知 MSC1用户的 rSRVCC 签约信息已经更新;
这里, MSC1 为 rSRVCC签约信息发生更新的用户对应的 UE的锚定 MSC , 所 述 HSS 可 以 通 过 发 送 插 入 签 约 数 据 ( MAP-INSERT-SUBSCRIBER-DATA ) 消息, 通知 MSC1用户的 rSRVCC 签约信息发生更新; 具体为, 该插入签约数据消息中可以携带签约状态信 息进行通知; 或, 通过该插入签约数据消息是否携带有指示信息, 进行用 户是否具有 rSRVCC签约的判定。
其中, 签约状态信息或指示信息可以通过显式的方式来表示用户有或 无 rSRVCC签约; 也可以通过隐式的方式进行表示; 其中, 显式的方式是 指当插入签约数据消息中携带有签约状态信息或提示信息时, 表明该用户 具有 rSRVCC签约; 隐式的方式是指当插入签约数据消息中没有携带签约 状态信息或提示信息时, 表明该用户具有 rSRVCC签约。
另外, 当 MSC1不是当前为 UE提供服务的 MSC时, 则需要执行步驟 303; 其中, 本发明实施例中, 当 UE已经进行过一次 CS域内的切换时, 为 UE提供服务的 MSC会发生变更; 这里, UE进行 CS域切换之前, 为 UE提供服务的 MSC为锚定 MSC, 记为 MSCl; CS域切换之后, 为 UE提 供服务的 MSC为目标 MSC, 记为 MSC2。
步驟 303 , MSC1根据接收到的更新消息, 通知 MSC2是否允许 UE切 换到 PS域;
这里, MSC1可以根据步驟 302中获得的用户的 rSRVCC签约状态,通 知 MSC2是否允许所述用户对应的 UE切换到 PS域;
其 中 , MSC1 可 以 通 过 发 送 前 转 访 问 信 令 ( MAP_FORWARD_ACCESS_SIGNALLING ) 消息, 通知 MSC2是否允许 用户切换到 PS域; 具体为, 该前转访问信令消息中可以携带指示信息, 通 知 MSC2是否允许用户切换到 PS域; 例如, 可以设定当前转访问信令消息 中携带有指示信息时, 表示允许 UE切换到 PS域; 或当前转访问信令消息 中携带有指示信息时, 表示不允许 UE切换到 PS域;
具体地, 利用前转访问信令消息的 AN-APDU 字段包含的指派请求 ( Assignment Request ) 消息或通用标识 ( Common ID ) 消息进行指示信息 的携带, 具体携带方式与上述提示信息的携带方式相同, 不再赘述。
步驟 304, MSC1根据获得的 rSRVCC签约状态、或 MSC2根据获得的 所述指示信息, 指示基站系统是否允许 UE切换到 PS域;
具体地, 当当前为 UE提供服务的 MSC与 MSC1为同一 MSC时, 则 MSC1根据步驟 302中获得的 rSRVCC签约状态, 指示基站系统是否允许 UE切换到 PS域;
当当前为 UE提供服务的 MSC为 MSC2时, 即在此之前, UE已经进 行过一次 CS域内的切换时, 此时 MSC2根据步驟 303中获取的指示信息, 通知基站系统是否允许 UE切换到 PS域;
这里, MSC1、 MSC2 均可以通过发送 Assignment Request 消息或 Common ID消息进行指示信息的携带, 具体携带方式与步驟 303中指示信 息的携带方式相同, 不再赘述。
其中, 基站系统根据接收到的消息中的指示信息, 决定 UE在进行 CS 域会话时, 是否允许 UE切换到 PS域, 还是只允许 UE在 CS域进行切换。
图 4示出了基于 IMS的控制切换方法实施例二的实现流程, 其中, 本 实施例的应用场景为在 UE建立 CS域会话的过程中或正在进行 CS域会话 的过程中, 会话信令经过 MSC、 IMS会话控制信令网元(如 ATCF、 CSCF、 AS等 )到达远端 UE, IMS会话控制信令网元进行控制切换的过程, 如图 4 所示, 所述实施例二包括下述步驟:
步驟 401 , IMS会话控制信令网元根据预设条件, 对用户的 IMS注册 状态是否改变进行判断, 或对用户的特定 IMS业务的存在状态的是否改变 进行判断, 当发生变化, 则执行步驟 401;
具体地, 用户可以在会话开始前就执行了 IMS注册操作, 由于 IMS注 册操作需要 UE定期发送 IMS重注册请求来维持用户的 IMS注册, 当 UE 进行 CS会话过程中, UE可能没有能力继续发送 IMS重注册请求, IMS会 话控制信令网元如果在预定的时间内没有收到 UE的 IMS重注册请求, 或 如果 IMS会话控制信令网元监测到用户 IMS注册的定时器超时, IMS会话 控制信令网元则判断用户的 IMS注册状态为失效; 这里, 预定的时间或用 户 IMS注册的定时器的时长可以小于或等于用户的 IMS注册超时时间; 而 在用户的 IMS注册失效后, IMS会话控制信令网元又收到了 UE发送的 IMS 注册消息, 则 IMS会话控制信令网元判断用户的 IMS注册状态为有效; 这里, 用户的特定 IMS业务可以为用户的一个或多个 IMS通讯业务; 用户的特定 IMS业务开始不存在, 当用户完成特定业务, 比如对于通讯业 务而言, 用户发送 INVITE (邀请 ) 消息或收到 INVITE消息并完成呼叫建 立后, 一个通讯业务即存在, 当用户结束该特定业务后, 比如对于通讯业 务而言, IMS会话控制信令网元收到用户发送的 BYE (挂断) 消息或收到 发往用户的 BYE消息, 则一个通讯业务就不存在了。
其中, 当在 UE建立 CS域会话前, 即 CS域会话尚未建立时, 步驟 401 还包括 IMS会话控制信令网元对用户的 IMS注册状态或用户的特定 IMS 业务的存在状态进行判断通知。
步驟 402, IMS会话控制信令单元判断得到用户的状态发生了改变,发 送消息至 MSC1 , 以通知 MSC1所述用户存在状态更改;
这里, MSC1为状态更改的用户对应的 UE的锚定 MSC, 当步驟 401 被执行后, IMS会话控制信令网元可以发送 IMS的信息(INFO )消息、 或 在会话建立过程中发送邀请( INVITE ) 消息的响应消息, 比如 "200 OK" 消息进行用户状态的通知, 具体地, 通过上述消息中携带用户的状态信息 进行通知; 或, 通过上述消息中是否携带有指示信息, 进行用户状态的通 知。
这里, 状态信息包括注册状态信息和 /或特定 IMS业务存在状态信息。 状态信息或指示信息可以通过显式的方式来表示用户有无 IMS注册和 /或是 否存在特定 IMS业务, 也可以通过隐式的方式进行表示; 其中, 该信息与 用户有无 IMS注册以及是否存在特定 IMS业务具有——对应关系, 比如, 使用转移号码信息作为注册状态的指示信息, 使用对话标识( Dialog-ID ) 作为是否存在特定 IMS业务的指示信息。
另外, 当 MSC1不是当前为 UE提供服务的 MSC时, 则需要执行步驟 403; 其中, 本发明实施例中, 当 UE已经进行过一次 CS域内的切换时, 为 UE提供服务的 MSC会发生变更; 这里, UE进行 CS域切换之前, 为 UE提供服务的 MSC为锚定 MSC, 记为 MSCl; CS域切换之后, 为 UE提 供服务的 MSC为目标 MSC, 记为 MSC2。
步驟 403 , MSC1根据步驟 402中获知的用户的状态, 通知 MSC2是否 允许 UE切换到 PS域;
这 里 , MSC1 可 以 通 过 发 送 前 转 访 问 信 令 ( MAP_FORWARD_ACCESS_SIGNALLING ) 消息, 通知 MSC2是否允许 用户切换到 PS域; 具体为, 该前转访问信令消息中可以携带指示信息, 通 知 MSC2是否允许用户切换到 PS域; 例如, 可以设定当前转访问信令消息 中携带有指示信息时, 表示允许 UE切换到 PS域; 或当前转访问信令消息 中携带有指示信息时, 表示不允许 UE切换到 PS域;
具体地, 利用前转访问信令消息的 AN-APDU 字段包含的指派请求 ( Assignment Request ) 消息或通用标识 ( Common ID ) 消息进行指示信息 的携带, 具体携带方式与上述提示信息的携带方式相同, 不再赘述。
步驟 404, MSC1根据获得的用户的状态、或 MSC2根据获取的指示信 息, 指示基站系统是否允许 UE切换到 PS域;
具体地, 当当前为 UE提供服务的 MSC与 MSC1为同一 MSC时, 则 MSC1根据步驟 402中获得的用户 IMS注册状态, 指示基站系统是否允许 UE切换到 PS域; 当当前为 UE提供服务的 MSC为 MSC2, 即在此之前, UE已经进行过 一次 CS域到 CS域之间的切换时, 此时 MSC2根据步驟 403中获取的指示 信息, 通知基站系统是否允许 UE切换到 PS域;
这里, MSC1、 MSC2 均可以通过发送 Assignment Request 消息或 Common ID消息进行指示信息的携带, 具体携带方式与步驟 403中指示信 息的携带方式相同, 不再赘述。
其中, 基站系统根据接收到的消息中的指示信息, 决定 UE在进行 CS 域会话时, 是否允许 UE切换到 PS域, 还是只允许 UE在 CS域进行切换。
这里, 应当理解, 本实施例中, 在 UE没有 CS域会话, 而当 UE发生 故障不能执行 IMS重注册操作或接收特定 IMS业务时, IMS会话控制信令 网元仍可以按照上述步驟对基站系统进行通知, 进行控制切换。
图 5示出了基于 IMS的控制切换方法实施例三的实现流程, 其中, 本 实施例的应用场景为 MSC执行 IMS注册过程中, IMS会话控制信令网元 (如 ATCF、 CSCF、 AS等)进行控制切换的过程, 如图 5所示, 所述实施 例三包括下述步驟:
步驟 501 , MSC1执行 IMS注册, 发送注册请求给 IMS会话控制信令 网元, 其中, 注册请求可以为 IMS的注册( REGISTER ) 消息;
这里, 注册操作与用户相关, 其中, 注册者信息可以根据 UE的 IMSI 推导得到。
步驟 502, IMS会话控制信令网元判断与 IMS注册消息相关的 UE是否 为用户执行了 IMS注册, 并通知 MSC1用户的 IMS注册状态;
这里, MSC1为发起注册请求的 MSC, 其中, IMS会话控制信令网元 可以通过注册响应消息, 比如 "200 OK" 消息进行用户 IMS注册状态的通 知, 具体地, 通过上述消息中携带用户的 IMS注册状态信息进行通知; 或, 通过上述消息中是否携带有指示信息, 进行用户 IMS注册状态的通知。 这里, 注册状态信息或指示信息可以通过显式的方式来表示用户有无
IMS注册,也可以通过隐式的方式进行表示; 其中,该信息与用户有无 IMS 注册具有一一对应关系, 比如, 使用转移号码信息作为指示信息, 因为转 移号码信息只有在用户具有 IMS注册时才会具有, 用户没有 IMS注册时则 不会具有, 因此, 可以有效地进行用户 IMS注册状态的通知。
步驟 503 , MSC1根据步驟 502中获知的用户 IMS注册状态,指示基站 系统是否允许 UE切换到 PS域;
这 里 , MSC1 可 以 通 过 发 送 前 转 访 问 信 令 ( MAP_FORWARD_ACCESS_SIGNALLING ) 消息, 通知基站系统是否允 许用户切换到 PS域; 具体为, 该前转访问信令消息中可以携带指示信息, 通知基站系统是否允许用户切换到 PS域; 例如, 可以设定当前转访问信令 消息中携带有指示信息时, 表示允许 UE切换到 PS域; 或当前转访问信令 消息中携带有指示信息时, 表示不允许 UE切换到 PS域;
具体地, 利用前转访问信令消息的 AN-APDU 字段包含的指派请求 ( Assignment Request ) 消息或通用标识 ( Common ID ) 消息进行指示信息 的携带, 具体携带方式与上述提示信息的携带方式相同, 不再赘述。
其中, 基站系统根据接收到的消息中的指示信息, 决定 UE在进行 CS 域会话时, 是否允许 UE切换到 PS域, 还是只允许 UE在 CS域进行切换。
图 6示出了基于 IMS的控制切换方法实施例四的实现流程, 其中, 本 实施例的应用场景为运营商对用户的 IMS进行注销后, IMS会话控制信令 网元控制切换的过程, 如图 6所示, 所述实施例四包括下述步驟, 其中步 驟 601~602与步驟 603可同时执行, 也可择一执行:
步驟 601 , 当运营商对用户的 IMS注册进行注销时, HSS向 IMS会话 控制信令网元中的 S-CSCF发送注销通知;
这里, 可以通过发送注销 ( De-REGISTER ) 消息进行注销的通知。 步驟 602, IMS会话控制信令网元的 S-CSCF通知 MSC1用户的 IMS 注册状态;
这里, MSC1为注册状态发生注销的用户对应的 UE的锚定 MSC, IMS 会话控制信令网元可以通过发送 IMS 的信息 (INFO ) 消息、 或留言 ( MESSAGE ) 消息进行通知, 具体地, 通过上述消息中携带用户的 IMS 注册状态信息进行通知; 或, 通过上述消息中是否携带有指示信息, 进行 用户 IMS注册状态的通知。
这里, 注册状态信息或指示信息可以通过显式的方式来表示用户有无 IMS注册,也可以通过隐式的方式进行表示; 其中,该信息与用户有无 IMS 注册具有一一对应关系, 比如, 使用转移号码信息作为指示信息, 因为转 移号码信息只有在用户具有 IMS注册时才会具有, 用户没有 IMS注册时则 不会具有, 因此, 可以有效地进行用户 IMS注册状态的通知。 另外, 本发 明实施例中, 注册状态信息显示为用户 IMS注册失效。
应当理解, S-CSCF还可以将步驟 601中接收到的注销( De-REGISTER ) 消息发给 ATCF , 由 ATCF 执行步驟 602 ; 或 ATCF 还可以将注销 ( De-REGISTER ) 消息发送给 P-CSCF, 由 P-CSCF执行步驟 602。
另外, 当 MSC1不是当前为 UE提供服务的 MSC时, 则需要执行步驟 604; 其中, 本发明实施例中, 当 UE已经进行过一次 CS域内的切换时, 为 UE提供服务的 MSC会发生变更; 这里, UE进行 CS域切换之前, 为 UE提供服务 MSC为锚定 MSC, 记为 MSCl; CS域切换之后, 为 UE提供 服务的 MSC为目标 MSC, 记为 MSC2。
步驟 603, 当运营商对用户的 IMS注册进行注销时, HSS通知 MSC1 用户的 IMS注册状态, 比如发送插入用户数据 ( Insert Subscriber Data ) 消 另外, 当 MSCl不是当前为 UE提供服务的 MSC时, 则需要执行步驟 604; 其中, 本发明实施例中, 当 UE已经进行过一次 CS域内的切换时, 为 UE提供服务的 MSC会发生变更; 这里, UE进行 CS域切换之前, 为 UE提供服务 MSC为锚定 MSC, 记为 MSCl ; CS域切换之后, 为 UE提供 服务的 MSC为目标 MSC, 记为 MSC2。
步驟 604, MSC1根据步驟 602和 /或步驟 603中获知的用户 IMS注册 状态, 通知 MSC2是否允许 UE切换到 PS域;
这 里 , MSC1 可 以 通 过 发 送 前 转 访 问 信 令 ( MAP_FORWARD_ACCESS_SIGNALLING ) 消息, 通知 MSC2是否允许 用户切换到 PS域; 具体为, 该前转访问信令消息中可以携带指示信息, 通 知 MSC2是否允许用户切换到 PS域; 例如, 可以设定当前转访问信令消息 中携带有指示信息时, 表示允许 UE切换到 PS域; 或当前转访问信令消息 中携带有指示信息时, 表示不允许 UE切换到 PS域;
具体地, 利用前转访问信令消息的 AN-APDU 字段包含的指派请求 ( Assignment Request ) 消息或通用标识 ( Common ID ) 消息进行指示信息 的携带, 具体携带方式与上述提示信息的携带方式相同, 不再赘述。
步驟 605, MSC1根据获得的用户 IMS注册状态、 或 MSC2根据获取 的指示信息, 指示基站系统是否允许 UE切换到 PS域;
具体地, 当当前为 UE提供服务的 MSC与 MSC1为同一 MSC时, 则 MSC1根据步驟 602和 /或步驟 603中获得的用户 IMS注册状态, 指示基站 系统是否允许 UE切换到 PS域;
如果当前为 UE提供服务的 MSC为 MSC2, 即在此之前, UE已经进行 过一次 CS域到 CS域之间的切换时, 此时 MSC2根据步驟 604中获取的指 示信息, 通知基站系统是否允许 UE切换到 PS域;
这里, MSC1、 MSC2 均可以通过发送 Assignment Request 消息或 Common ID消息进行指示信息的携带, 具体携带方式与步驟 604中提示信 息的携带方式相同, 不再赘述。
其中, 基站系统根据接收到的消息中的指示信息, 决定 UE在进行 CS 域会话时, 是否允许 UE切换到 PS域, 还是只允许 UE在 CS域进行切换。
应当理解, 本发明实施例中, 步驟 601中的注销 ( De-REGISTER ) 消 息也可以是由 P-CSCF或 S-CSCF发出, 此时, IMS会话控制信令网元中的 ATCF或 AS都会接收到该注销 (De-REGISTER ) 消息, 则 IMS会话控制 信令网元仍可以按照上述步驟 602以及步驟 604~605通知到基站系统, 由 基站系统对 UE进行控制切换。
图 7示出了基于 IMS的控制切换系统的结构示意, 如图 7所示, 所述 系统包括: IMS网元、 MSC及基站系统; 其中,
IMS网元, 用于通知 MSC用户的状态信息; 这里, 当 IMS网元检测 到 MSC用户没有执行 IMS注册、 或 IMS注册失效、 或用户的 rSRVCC签 约信息被更改、 或用户的特定 IMS业务存在或不存在的情况下, IMS网元 会发送通知消息给所述 MSC;
MSC, 用于根据用户的状态信息, 指示所述基站系统是否允许 UE切 换到 PS域。
这里, 所述 MSC可以分为锚定 MSC和目标 MSC;
所述锚定 MSC, 用于根据 IMS网元发送的用户的状态信息, 通知目标 MSC指示基站系统是否允许 UE切换到 PS域;; 其中, 当前为所述 UE提 供服务的 MSC为目标 MSC, 当 UE已经进行过一次 CS域内的切换时, 为 UE提供服务的 MSC会发生变更; 这里, UE进行 CS域切换之前, 为 UE 提供服务的 MSC为锚定 MSC; CS域切换之后, 为 UE提供服务的 MSC 为目标 MSC。
其中, 所述 IMS网元具体为 HSS, 用于当用户的 rSRVCC签约信息发 生更改时, 发送更新消息给所述 MSC; 其中, 所述 IMS网元具体为 IMS会话控制信令网元; 其中, 所述 IMS 会话控制信令网元为 CSCF、 ATCF、 或 AS。
其中, 所述 IMS网元具体为 IMS会话控制信令网元, 用于在预定的时 间内未收到用户的 IMS重注册, 或监测到用户 IMS注册的定时器超时时, 发送消息至所述 MSC, 以通知所述用户的 IMS注册失效。
其中, 所述 IMS网元具体为 HSS或 IMS会话控制信令网元, 用于当 判断得到所述用户进行过 IMS注册时, 发送消息至所述 MSC, 以通知用户 的 IMS注册有效; 当判断得到用户的 IMS注册被注销时, 发送消息至所述 MSC, 通知所述用户的 IMS注册失效。
其中, 所述 IMS网元为 IMS会话控制信令网元, 用于当判断得到所述 用户的 IMS业务的存在状态时, 发送消息至所述 MSC, 通知用户的 IMS 业务的存在状态。
以上所述, 仅为本发明的较佳实施例而已, 并非用于限定本发明的保 护范围。

Claims

权利要求书
1、 一种基于 IP多媒体子系统 IMS的控制切换方法, 其特征在于, 所 述方法包括:
IMS网元通知移动交换中心 MSC用户的状态信息;
所述 MSC根据所述用户的状态信息,指示基站系统是否允许用户终端 UE切换到包交换 PS域; 或,
当所述 MSC与目标 MSC不同时,所述 MSC根据所述用户的状态信息, 通知目标 MSC指示基站系统是否允许 UE切换到 PS域; 其中, 当前为所 述 UE提供服务的 MSC为目标 MSC。
2、 根据权利要求 1所述的方法, 其特征在于, 所述 IMS网元为 IMS 签约管理单元 HSS, 当用户的反向单待业务连续性 rSRVCC签约信息发生 更改时, 所述 IMS网元通知 MSC用户的状态信息为:
HSS发送更新消息给所述 MSC。
3、 根据权利要求 1所述的方法, 其特征在于, 所述 IMS网元为 IMS 会话控制信令网元,当 IMS网元在预定的时间内未收到用户的 IMS重注册, 或监测到用户 IMS注册的定时器超时, 所述 IMS网元通知 MSC用户的状 态信息为:
IMS会话控制信令网元发送消息至所述 MSC,通知所述用户的 IMS注 册失效。
4、 根据权利要求 3所述的方法, 其特征在于, 所述预定的时间或所述 定时器的时长小于或等于所述用户的 IMS注册超时时间。
5、 根据权利要求 1所述的方法, 其特征在于, 所述 IMS网元为 HSS 或 IMS会话控制信令网元,当 IMS网元判断得到所述用户进行过 IMS注册 时, 所述 IMS网元通知 MSC用户的状态信息为:
所述 IMS网元发送消息至所述 MSC, 通知用户的 IMS注册有效。
6、 根据权利要求 1所述的方法, 其特征在于, 所述 IMS网元为 HSS 或 IMS会话控制信令网元,当所述 IMS网元判断得到用户的 IMS注册被注 销时, 所述 IMS网元通知 MSC用户的状态为:
所述 IMS网元发送消息至所述 MSC, 通知所述用户的 IMS注册失效。
7、 根据权利要求 1所述的方法, 其特征在于, 所述 IMS网元为 IMS 会话控制信令网元, 当 IMS网元判断得到所述用户的 IMS业务的存在状态 时, 所述 IMS网元通知 MSC用户的状态信息为:
IMS会话控制信令网元发送消息至所述 MSC,通知用户的 IMS业务的 存在状态。
8、 一种基于 IMS的控制切换系统, 包括基站系统, 其特征在于, 所述 系统还包括: IMS网元、 MSC; 其中,
IMS网元, 用于通知 MSC用户的状态信息;
MSC, 用于根据用户的状态信息, 指示所述基站系统是否允许 UE切 换到 PS域。
9、根据权利要求 8所述的系统,其特征在于,所述 MSC分为锚定 MSC 和目标 MSC;
所述锚定 MSC, 用于根据 IMS网元发送的用户的状态信息, 通知目标 MSC指示基站系统是否允许 UE切换到 PS域; 其中, 当前为所述 UE提供 服务的 MSC为目标 MSC。
10、 根据权利要求 8或 9所述的系统, 其特征在于, 所述 IMS网元为 HSS, 用于当用户的 rSRVCC签约信息发生更改时, 发送更新消息给所述 MSC。
11、 根据权利要求 8或 9所述的系统, 其特征在于, 所述 IMS网元为 IMS会话控制信令网元; 其中, 所述 IMS会话控制信令网元为呼叫会话控 制功能 CSCF、 访问转移控制功能 ATCF或应用服务器 AS。
12、根据权利要求 11所述的系统, 其特征在于, 所述 IMS网元为 IMS 会话控制信令网元, 用于在预定的时间内未收到用户的 IMS重注册, 或监 测到用户 IMS注册的定时器超时时, 发送消息至所述 MSC, 通知所述用户 的 IMS注册失效。
13、根据权利要求 11所述的系统, 其特征在于, 所述 IMS网元为 HSS 或 IMS会话控制信令网元, 用于当判断得到所述用户进行过 IMS注册时, 发送消息至所述 MSC, 通知所述用户的 IMS注册有效; 当判断得到用户的 IMS注册被注销时,发送消息至所述 MSC,通知所述用户的 IMS注册失效。
14、 根据权利要求 11所述的系统, 其特征在于, 所述 IMS网元为 IMS 会话控制信令网元, 用于当判断得到所述用户的 IMS业务的存在状态时, 发送消息至所述 MSC, 通知用户的 IMS业务的存在状态。
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