WO2008011772A1 - Procédé de changement de service, système de communication mobile, appareil de réseau fédérateur et appareil de réseau d'accès - Google Patents

Procédé de changement de service, système de communication mobile, appareil de réseau fédérateur et appareil de réseau d'accès Download PDF

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Publication number
WO2008011772A1
WO2008011772A1 PCT/CN2007/001023 CN2007001023W WO2008011772A1 WO 2008011772 A1 WO2008011772 A1 WO 2008011772A1 CN 2007001023 W CN2007001023 W CN 2007001023W WO 2008011772 A1 WO2008011772 A1 WO 2008011772A1
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WO
WIPO (PCT)
Prior art keywords
service
mobile communication
communication system
access network
multimedia
Prior art date
Application number
PCT/CN2007/001023
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English (en)
Chinese (zh)
Inventor
Xiaoming Wu
Yan Ding
Xiaopeng Zhang
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.
Publication of WO2008011772A1 publication Critical patent/WO2008011772A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/12—Reselecting a serving backbone network switching or routing node
    • H04W36/125—Reselecting a serving backbone network switching or routing node involving different types of service backbones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H04W36/144—Reselecting a network or an air interface over a different radio air interface technology
    • H04W36/1443—Reselecting a network or an air interface over a different radio air interface technology between licensed networks

Definitions

  • WCDMA Wideband Code Division Multi Access
  • Unrestricted Digital Information/Restricted Digital Information (UDI/RI, Unrestricted Digital Information/Restricted Digital Information)
  • Service Change and UDI/RDI Fallback (SCUDIF, Service Change and UDI/RDI Fallback) calls are supported by 3G mobile communication systems.
  • Multimedia call of BCIE (Bearer Capability Information Element) SCUDIF call will be degraded to voice call in some specific cases such as radio resource is not satisfied or network is not supported; and the radio resource is satisfied or some specific When the condition is met, the SCUDIF call will be able to be promoted from a voice call to a multimedia call.
  • BCIE Breast Capability Information Element
  • the user who uses the dual mode terminal may appear from the 3G mobile communication system to the 2G mobile communication system or from the 2G mobile communication system. Inter-system handover of 3G mobile communication systems. If the user's call is a SCUDIF call, then in the process of switching from the 3G mobile communication system to the 2G mobile communication system, since the 2G mobile communication system does not support the multimedia service, the user's multimedia service will be degraded to a voice service;
  • the network selection of the terminal is preferably a 3G mobile communication system, and when the radio resource condition is satisfied, the terminal will switch back to the 3G mobile communication system again.
  • the inter-system handover from the 2G mobile communication system to the 3G mobile communication system is implemented by the relocation process, due to the previous users.
  • the SCUDIF call has been degraded to a voice call, so after switching back from the 2G mobile communication system to the 3G mobile communication system, the user's service is still a voice service.
  • the Radio Network Controller (RNC) device does not actively request to transmit the service from the voice.
  • the service is promoted to a multimedia service, and the user cannot switch back to the SCUDIF call service after switching between systems.
  • the embodiment of the present invention provides a service change method when a SCUDIF call is switched from a 3G mobile communication system to a 2G mobile communication system, and then switched back to the 3G mobile communication system by the 2G mobile communication system, and the mobile communication will be implemented in 2G mobile communication.
  • the degraded SCUDIF call in the system is restored to the purpose of the SCUDIF call.
  • An unrestricted/restricted digital information service change and fallback SCUDIF call disclosed in the embodiment of the present invention is switched from a third generation mobile communication 3G mobile communication system to a second generation mobile communication 2G mobile communication system, and then switched by a 2G mobile communication system.
  • the method of business change when returning to the 3G mobile communication system includes the following steps:
  • the core network in the 3G mobile communication system determines the handover back service in the 2G mobile communication system After being degraded, the access network is notified to modify the service to an unrestricted/restricted digital information service change and to fall back to the SCUDIF call service;
  • the access network modifies the service to a SCUDIF call service according to the notification.
  • the embodiment of the invention also provides a 3G mobile communication system, in which the SCUDIF call is from
  • the 3G mobile communication system disclosed in the embodiment of the present invention includes a core network device and an access network device;
  • the core network device configured to determine whether a service that is switched back to the 3G mobile communication system from the 2G mobile communication system is degraded in the 2G mobile communication system, and is used to notify the service when determining that the service is degraded
  • the access network device modifies the service to a SCUDIF call service, and the access network device is configured to modify the service to a SCUDIF call service according to the notification of the core network device.
  • the embodiment of the invention further provides a core network device in a 3G mobile communication system, when the SCUDIF call is switched from the 3G mobile communication system to the 2G mobile communication system, and then the 2G mobile communication system is switched back to the 3G mobile communication system, The degraded SCUDIF call in the 2G mobile communication system is restored to the purpose of the SCUDIF call.
  • the core network device of the 3G mobile communication system disclosed in the embodiment of the present invention includes a service determining module and a first communication module;
  • the service determining module configured to determine whether a service switched from the 2G mobile communication system back to the 3G mobile communication system is degraded in a 2G mobile communication system, and when determining that the service is degraded, The first communication module notifies the access network device to modify the service to the SCUDIF call service.
  • An embodiment of the present invention further provides an access network device in a 3G mobile communication system, where When the SCUDIF call is switched from the 3G mobile communication system to the 2G mobile communication system, and the 2G mobile communication system is switched back to the 3G mobile communication system, the SCUDIF call that is degraded in the 2G mobile communication system is restored to the SCUDIF call.
  • the access network device in the 3G mobile communication system disclosed in the embodiment of the present invention includes a service modification module and a second communication module;
  • the second communication module is configured to send a notification from the core network device to the service modification module;
  • the service modification module is configured to modify the service to a SCUDIF call service according to the notification of the core network device.
  • FIG. 1 is an exemplary flowchart of a method for changing a service according to an embodiment of the present invention.
  • FIG. 2 is a flowchart of a method for implementing service change according to an embodiment of the present invention.
  • FIG. 3 is a flowchart of a method for implementing service change according to Embodiment 2 of the present invention.
  • FIG. 4 is a schematic structural diagram of a 3G mobile communication system according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a core network device according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of a structure of an access network device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION The present invention will be further described in detail below with reference to the accompanying drawings.
  • FIG. 1 is an exemplary flowchart of a method for changing a service according to an embodiment of the present invention. Referring to Figure 1, the method includes the following steps:
  • Step 101 When the SCUDIF call is handed over from the 3G mobile communication system to the 2G mobile communication system, and then switched back to the 3G mobile communication system by the 2G multi-mobile communication system, the core network in the 3G mobile communication system determines that the switched back service is in the 2G mobile communication. After being degraded in the system, the access network is notified to modify the service to the SCUDIF call service;
  • Step 102 The access network modifies the service to a SCUDIF call service according to the notification.
  • the core network may notify the access network to perform service modification by using the two preferred methods: one is to use the radio access bearer (RAB, Radio Access Bearer) to assign a message notification.
  • RAB Radio Access Bearer
  • the other is a notification by a relocation request message.
  • the core network sends an RAB assignment message carrying the multimedia and voice dual configuration to the access network to notify the access network to perform service modification; the latter method is to switch between systems.
  • the core network carries the multimedia and voice dual configuration in the RAB parameter in the relocation request message sent to the access network to notify the access network to perform service modification.
  • the multimedia and voice dual configuration may be dual configuration in which the multimedia is the preferred service and the voice is the optional service, or the dual configuration in which the voice is the preferred service and the multimedia is the optional service.
  • the corresponding policy may be set in the core network in advance, and the dual configuration type carried in the AB assignment message or the relocation request message is specified by the policy.
  • the steps performed by the core network may be performed by a Mobile Switching Center (MSC) in the core network or other devices having equivalent functions, and may be performed by a radio network controller in the access network. (RC) or other equivalent device to perform the steps performed by the access network.
  • MSC Mobile Switching Center
  • RC radio network controller
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • the MSC uses the mode in which the multimedia is the preferred service and the voice is the optional service in the RAB assignment message, and the C is notified to modify the service to the SCUDIF call service.
  • the RAB assignment message is used in the service establishment phase, and the RAB assignment message can be used to establish, modify, or delete the user's service.
  • the MSC of the 3G mobile communication system determines whether the user's service is degraded in the 2G mobile communication system according to the user service capability value recorded in the call setup phase. When it is determined that the user's service is degraded, the MSC The RAB assignment message is sent to the RC, and the message carries the optional RAB configuration cell value (Alternative RAB). Configuration IE), and dual configuration in which multimedia is the preferred service and voice is optional, to notify the RNC to modify the service to the SCUDIF call service.
  • RAB configuration cell value Alternative RAB
  • FIG. 2 is a flowchart of a method for implementing service change according to an embodiment of the present invention.
  • BSC-A and MSC-A in the figure are BSC and MSC devices in the 2G mobile communication system, respectively, and RNC-B and MSC_B are RNC and MSC devices in the 3G mobile communication system, respectively.
  • the method includes the following steps:
  • Step 201 The calling user equipment (UE) reports a measurement report (Measure__Report) to the BSC-A, and the BSC_A determines, according to the measurement report, that the inter-system handover of the 2G mobile communication system to the 3G mobile communication system is required.
  • UE calling user equipment
  • Step 202 The BSC-A sends a handover request message (A-HO_Required) to the MSC-A through the A interface.
  • A-HO_Required a handover request message
  • Step 203 The MSC-A requests the system to switch (MAP_Prep_HO_REQ) to the MSCJB of the 3G mobile communication system by using the Mobile Application Part (MAP) signaling.
  • MAP Mobile Application Part
  • Step 204 The MSC-B sends a relocation request (Iu_Relocation_Request) to the RNC-B, and requests the RNC-B of the 3G mobile communication system to allocate the switching service resource.
  • Iu_Relocation_Request a relocation request
  • Step 205 The RNC-B allocates the switching service resource, and sends a response message (Iu_Relocation_Request_ACK) to the MSC-B to complete the relocation preparation.
  • Step 206 The MSC-B notifies the MSC-A system to complete the handover preparation (MAPJPrep-HO-RSP) through the E interface.
  • Step 207 The MSC-A sends a handover command (A-HO_COMMAND) to the BSC-A to perform a handover procedure.
  • A-HO_COMMAND a handover command
  • Step 208 The BSC_A notifies the UE to perform handover (HO_COMMAND).
  • Step 209 R C_B monitors the activity of the calling UE in the 3G mobile communication system. After that, notify MSC-B (Iu_Relocation_Detect).
  • Step 210 After receiving the activity notification, the MSC_B notifies the MSC_A (MAP_Process_Access_Signal-Req) through the MAP message.
  • MSC_A MAP_Process_Access_Signal-Req
  • Step 211 Perform an air interface switch.
  • Step 212 After the air interface switching is completed, the RNC-B notifies the MSC-B that the entire relocation process is completed (Iu_Relocation-Complete), that is, the inter-system handover of the 2G mobile communication system to the 3G mobile communication system is completed.
  • Step 213 The MSC-B notifies the MSC-A system to complete the handover (MAP_Send-End-Signal-Req) through the MAP message.
  • Step 214 Clear the 2G mobile communication system side resources.
  • Step 215 After determining that the user's service is degraded in the 2G mobile communication system, the MSC-B uses the RAB assignment message to notify the RNC-B to modify the user's service to the SCUDIF call service.
  • the MSC in the 3G mobile communication system that the user accesses will record the user's service capability value.
  • the 3G mobile communication system initially accessed by the user is The MSC in the MSC will learn the state of the call of the user through the signaling interaction with the user terminal; before the end of the call, the MSC in the 3G mobile communication system that the user initially accesses will retain the service capability value of the user; therefore, In this step, the MSC-B can compare the user service capability value recorded in the call setup phase with the service that the user currently switches back. When the user service capability value is different from the switched back service, the switchback is determined. The business is degraded in the 2G mobile communication system.
  • the MSC-B records the user service capability value as the SCUDIF call service, and the switched back service is the voice service, and the MSC B determines that the user's service is in the 2G mobile communication. The system was degraded in the letter system.
  • the MSCJB determines that the user's service is degraded in the 2G mobile communication system, and then notifies the RNC-B by carrying a dual configuration indicating that the multimedia is the preferred service and the voice is the optional service in the RAB assignment message. Modify the service to the SCUDIF call service.
  • the specific implementation method is: configuring the preferred service of the RAB assignment message as a multimedia service, and configuring the voice service in the optional RAB configuration cell value.
  • the first case If the switched R C device supports the 3GPP R6 and later versions, that is, R CJB supports the dual configuration of user capabilities, go to step 215.1a.
  • Step 215.1a The MSC-B sends an RAB assignment request message (Iu_AB_Assignment_REQ) to the RNC-B, and the message carries the dual configuration that the multimedia service is the preferred service and the voice service is the optional service.
  • RAB assignment request message Iu_AB_Assignment_REQ
  • Step 215.1b The R C_B modifies the RAB according to the RAB assignment message, and modifies the service of the user into a multimedia service, and the voice service is an optional service of the user.
  • Step 215.1c After the RAB modification is completed, the RNC-B returns a successful response (Iu_RAB_Assignment_RSP) to the MSCJB. At this point, the calling party service change process is completed, and the user's service is modified to the multimedia preferred, voice selectable SCUDIF call service.
  • Step 115.1d The MSC-B notifies the network and the called end user to perform service modification.
  • the MSC-B can initiate a notification of modifying the service to the network and the called end user at any time after the handover between the systems is completed.
  • the second case If the switched RNC device only supports versions prior to 3GPP R6, That is, RNC-B only supports the user capability single configuration scheme, and step 215.2a is performed.
  • Step 215.2a The MSC_B sends an RAB Assignment Request message (Iu_RAB_ Assignment_REQ) to the RNC-B.
  • the message carries the dual configuration that the multimedia service is the preferred service and the voice service is the optional service.
  • Step 215.2b R C_B receives the RAB assignment message. Since RNC-B does not support dual configuration, R C_B returns a failure response (Iu_RAB_ Assignment_RSP) to MSC_B.
  • Step 215.2c After receiving the failure response, the MSC-B analyzes the failure reason. When the failure reason is that the configuration is not supported, the MSC-B re-sends the RAB assignment request (Iu_RAB_Assignment_REQ) to the RNC-B, and the message only carries Multimedia configuration solution.
  • Step 215.2d The RNC-B modifies the RAB according to the RAB assignment message, and modifies the user's service into a multimedia service.
  • Step 215.2e After the RAB modification is completed, the RNC-B returns a successful response (Iu_RAB_Assignment_RSP) to the MSC-B. At this point, the calling party modification process is completed, and the user's service is modified into a multimedia service.
  • Step 215.2f The MSC-B notifies the network and the called end user to perform service modification.
  • the MSC-B can initiate a notification of modifying the service to the network and the called end user at any time after the handover between the systems is completed.
  • step 215.2d fails, that is, the second modification request fails, no modification attempt is made.
  • the inter-system handover is completed, and the user's service has been modified to be a multimedia service. It can be seen from the above technical solution that, in this embodiment, the user is first switched to the 3G mobile communication system according to the inter-system switching process of the voice service;
  • the MSC in the 3G mobile communication system compares the user service capability value recorded in the call setup phase with the switched back service, and determines whether the user's service is in the 2G mobile communication system. Degradation When the service capability value of the user is different from the service that is switched back, it is determined that the service of the user is degraded, and the MSC sends an RAB assignment message to the RNC, and carries the multimedia as the preferred service in the message, and the voice is The optional service dual configuration informs the RNC to modify the service to the SCUDIF call service, thereby achieving the purpose of restoring the degraded SCUDIF call to the SCUDIF call.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • the MSC uses the RAB parameter in the relocation request message to carry the voice as the preferred service and the multimedia as the optional service dual configuration, and informs the R C to modify the service to the SCUDIF call service.
  • the relocation request message is a request sent by the MSC to R C during the relocation process of the inter-system handover.
  • the user switches back from the 2G mobile communication system to the 3G mobile communication system again, in which the MSC of the 3G mobile communication system judges the user according to the user service capability value recorded in the call setup phase. Whether the service is degraded in the 2G mobile communication system. After determining that the user's service is degraded, the MSC uses the RAB parameter in the relocation request message to carry the multimedia as the preferred service and the voice as the optional service dual configuration to notify the RNC. The service is modified to the SCUDIF call service.
  • FIG. 3 is a flowchart of a method for implementing service change according to Embodiment 2 of the present invention.
  • BSC-A and MSC-A in the figure are BSC and MSC devices in the 2G mobile communication system, respectively, and RNC B and MSCJB are RNC and MSC devices in the 3G mobile communication system, respectively.
  • the method includes the following steps:
  • Step 301 The calling user equipment (UE) reports a measurement report (Measure_Report) to the BSC-A, and the BSC-A determines, according to the measurement report, that the system switching between the 2G mobile communication system and the 3G mobile communication system is required.
  • UE calling user equipment
  • Step 302 The BSC-A sends a handover request message (A-HO_Required) to the MSC-A through the A interface.
  • the MSC-B determines that the user's service is down-converted in the 2G mobile communication system, and carries the dual configuration in the RAB parameter of the relocation request according to the format of the relocation request specified in the 3GPP technical specification.
  • the preferred service of the RAB parameter is configured as a multimedia service, and the voice service is configured in an optional RAB configuration cell value of the RAB parameter.
  • Step 305 The RNC-B receives the relocation request, and responds according to whether it supports the service ⁇ ' '.
  • Step 305.1a The RNC-B modifies the RAB according to the RAB parameter in the relocation request, and modifies the service of the user into a multimedia service, and the voice service is an optional service of the user.
  • Step 305.1b The RNC-B allocates the switching service resource, and sends a response message (Iu_Relocation_Request_ACK) to the MSCJB to complete the relocation preparation, and proceeds to step 306.
  • the second case If the R C device only supports the previous version of 3GPP R6, that is, RNC-B only supports the user capability list configuration scheme, go to step 305.2.
  • Step 305.2 RNC_B receives the relocation request. Since RNC_B does not support dual configuration, RNC-B returns a handover failure response (Iu_Relocation_Request_ACK) to MSC-B, the inter-system handover fails, and the service change fails. Process business changes.
  • Iu_Relocation_Request_ACK a handover failure response
  • Step 306 Steps 306 to 314 of this embodiment are identical to the operations of step 206 to step 214 of the first embodiment. Please refer to the corresponding parts in the first embodiment, and details are not described herein again.
  • MSC_B may initiate a modification service notification to the network and the called end user at any time after the inter-system handover is completed.
  • the MSC of the 3G mobile communication system compares with the service that is switched back according to the value of the user service capability recorded in the call setup phase, and determines the user. Whether the business is degraded in the 2G mobile communication system;
  • the MSC uses the RAB parameter in the relocation request message to carry the multimedia as the preferred service and the voice as the optional service.
  • the SCUDIF call supporting the dual BCIE can be established directly under the 3G mobile communication system, thereby realizing that the SCUDIF call that is degraded in the 2G mobile communication system is restored to the SCUDIF call. purpose.
  • the dual configuration specified by the policy set in the MSC is: dual configuration in which multimedia is the preferred service and voice is the optional service.
  • the dual configuration specified in the policy set by the MSC in advance may also be: dual configuration in which voice is the preferred service and multimedia is the optional service.
  • the method for carrying the voice as the preferred service and the dual-configuration of the multimedia as the optional service in the RAB assignment message or the relocation request message is: configuring the preferred service of the RAB assignment message or the RAB parameter in the relocation message as Voice service, and configure multimedia services in optional RAB configuration cell values.
  • the RNC When the RAB assignment message or the relocation message carries a dual configuration indicating that the voice is the preferred service and the multimedia is the optional service, when the switched RNC supports the dual configuration of the user capability, and the radio resource is satisfied, the RNC will The MSC is requested to modify the voice service into a multimedia service.
  • the RAB assignment message carrying the multimedia list configuration or the relocation request message may also be used, which can guarantee the RNC.
  • the service is promoted to the multimedia service.
  • the wireless resource since the user does not have an optional service, when the wireless resource is not satisfied, the user cannot degrade the multimedia service into a voice service, which increases the probability of dropped calls. Therefore, in implementing the present invention, it is recommended to use the method of carrying the dual configuration in the RAB assignment message or the relocation message to restore the service to the SCUDIF call service.
  • FIG. 4 is a schematic structural diagram of a 3G mobile communication system according to an embodiment of the present invention.
  • the system includes a core network device 410 and an access network device 420.
  • the core network device 410 is configured to send the RAB assignment message carrying the multimedia and voice service dual configuration to the access network device 420 after switching the service back to the 3G mobile communication system according to the voice service switching process; or And transmitting, in the relocation process of the service switching from the 2G mobile communication system to the 3G mobile communication system, the relocation request message carrying the dual configuration of the multimedia and the voice service to the access network device 420;
  • the access network device 420 is configured to modify the service to the SCUDIF call service according to the configuration information carried in the RAB assignment message or the relocation request message.
  • the access network device 420 may further be configured to return a failure response to the core network device 410 that the failure reason is unsupported by the configuration;
  • the core network device 410 When the core network device 410 analyzes that the failure reason is a failure response that is not supported by the configuration, It may be further used to send an RAB assignment message carrying only the multimedia list configuration to the access network device 420.
  • FIG. 5 is a schematic structural diagram of a core network device according to an embodiment of the present invention.
  • the core network device includes: a service determining module 510 and a first communication module 520.
  • the service determining module 510 is configured to determine whether the service that is switched back to the 3G mobile communication system from the 2G mobile communication system is degraded in the 2G mobile communication system, and is used to pass the first communication module 520 when determining that the service is degraded.
  • the access network device is notified to modify the service to the SCUDIF call service.
  • the first communication module 520 is configured to: after the access network device switches the service back to the 3G mobile communication system according to the voice service switching procedure, send the RAB carrying the multimedia and voice service dual configuration to the access network device. Assignment message;
  • the relocation request message carrying the dual configuration of the multimedia and the voice service is sent to the access network device.
  • FIG. 6 is a schematic structural diagram of a structure of an access network device according to an embodiment of the present invention.
  • the access network device includes: a service modification module 610 and a second communication module 620.
  • the second communication module 620 is configured to send a notification from the core network device to Business modification module 610;
  • the service modification module 610 is configured to modify the service to the SCUDIF call service according to the notification of the core network device.
  • the second communication module 620 is configured to send the RAB assignment message or the relocation request message that carries the configuration information from the core network device to the service modification module 610.
  • the service modification module 610 is configured to The configuration information carried in the message or the relocation request message is modified to modify the service to the SCUDIF call service.
  • the access network device shown in FIG. 6 may include a determining module 630.
  • the determining module 630 is configured to determine whether the access network device supports dual configuration of user capabilities, and when determining that the access network device does not support dual configuration of user capabilities. And the failure reason for returning the failure to the core network device by using the second communication module is a failure response that is not supported by the configuration.
  • the 3G mobile communication system disclosed in the embodiment of the present invention includes a core network device and an access network device, and the core network device determines that the service switched from the 2G mobile communication system back to the 3G mobile communication system is in the 2G mobile communication. Whether the system is degraded, and when it is determined that the service is degraded, the access network device is notified to modify the service to the SCUDIF call service; and the access network device performs the service modification according to the notification of the core network, thereby achieving The degraded SCUDIF call in the 2G mobile communication system is restored to the purpose of the SCUDIF call.

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Abstract

L'invention concerne un procédé de changement de service qui permet de commuter un appel SCUDIF d'un système de communication mobile 3G dans un système de communication mobile 2G, et de le commuter à nouveau du système 2G dans le système 3G. Le procédé de l'invention fonctionne de la manière suivante: le réseau fédérateur du système de communication mobile, après avoir déterminé que la qualité du service commuté dans le système de communication mobile 2G s'est déteriorée, notifie au réseau d'accès le changement de service vers un service d'appel SCUDIF; et le réseau d'accès précité change le service en service d'appel SCUDIF conformément à la notification. L'invention se rapporte également à un système de communication mobile 3G. Le modèle d'utilité de l'invention permet à un utilisateur de reprendre un appel SCUDIF dont la qualité s'est déteriorée dans le système de communication mobile 2G, en commutant du système de communication mobile 2G au système de communication mobile 3G.
PCT/CN2007/001023 2006-07-19 2007-03-29 Procédé de changement de service, système de communication mobile, appareil de réseau fédérateur et appareil de réseau d'accès WO2008011772A1 (fr)

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CNA2006100988971A CN1889777A (zh) 2006-07-19 2006-07-19 从第二代切换回第三代移动通信系统的业务更改方法
CN200610098897.1 2006-07-19

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