WO2008011772A1

WO2008011772A1 - Service change method and mobile communication system and core network apparatus and access network apparatus

Info

Publication number: WO2008011772A1
Application number: PCT/CN2007/001023
Authority: WO
Inventors: Xiaoming Wu; Yan Ding; Xiaopeng Zhang
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2006-07-19
Filing date: 2007-03-29
Publication date: 2008-01-31
Also published as: CN1889777A

Abstract

The invention provides a service change method for switching SCUDIF call from 3G mobile communication system to 2G mobile communication system and switching back again from 2G mobile communication to 3G communication system. The method includes the following steps: The 3G mobile communication system core network determine that the switched back service quality is deteriorated in 2G mobile communication system, then notifies the access network to change the said service to the SCUDIF call service; the said access network changes the said service to the SCUDIF call service according to the said notice. The invention also provides a 3G mobile communication system. By applying the utility model of the invention, the SCUDIF call which quality is deteriorated in 2G mobile communication system can be resumed, when user switching back 3G mobile communication system from 2G mobile communication system.

Description

Business change method, mobile communication system, core network device and access network device

The present invention relates to a handover technique between mobile communication systems, and more particularly to a service change method for switching from a second generation back to a third generation mobile communication system, a third generation mobile communication system, a core network device, and an access network device. Background of the invention

With the maturity of third-generation mobile communication (3G) Wideband Code Division Multi Access (WCDMA) technology, WCDMA networks have been deployed in many countries around the world. In the construction process of 3G mobile communication system, in order to reduce the cost of network construction and provide the function of continuous service, it is necessary to rely on the second generation mobile communication (2G) network to gradually achieve the goal of continuous coverage. Therefore, for a long period of time, the 2G mobile communication system and the 3G mobile communication system will coexist and complement each other.

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.

When a user conducts a multimedia service call in an area covered by the 2G mobile communication system and the 3G mobile communication system, 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. According to the description of the 3GPP TS 23.009 R6 protocol of the 3GPP, The 3rd Generation Partnership Project, 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. When switching from a 3G mobile communication system to a 2G mobile communication system, 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.

In this way, information loss occurs on the access network side of the 3G mobile communication system. Therefore, even if the radio resource condition is satisfied, 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. Summary of the invention

In view of this, 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

When the 3G mobile communication system switches to the 2G mobile communication system and the 2G mobile communication system switches 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 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.

It can be seen from the above technical solution that, in the service change method of switching from the 2G mobile communication system back to the 3G mobile communication system disclosed in the embodiment of the present invention, when the core network in the 3G mobile communication system determines that the switched back service is in the 2G mobile communication When the system is degraded, the access network is notified to modify the service to the SCUDIF call service; the access network modifies the service to the SCUDIF call service according to the notification. In this way, the service information on the access network side of the 3G mobile communication system can be restored, thereby achieving the purpose of restoring the degraded SCUDIF call in the 2G mobile communication system to the SCUDIF call.

In addition, 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 whether the service switched from the 2G mobile communication system back to the 3G mobile communication system is used in the 2G mobile communication system. Degradation, 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 device, thereby achieving the 2G mobile communication The reduced SCUDIF call in the system is restored to the purpose of the SCUDIF call. BRIEF DESCRIPTION OF THE DRAWINGS

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.

In the embodiment of the present invention, two preferred methods are provided, and 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. The other is a notification by a relocation request message. In the former method, after the inter-system handover is completed, 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. During the relocation process, 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. This hair 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.

In the above method, 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. The following takes the MSC and the RNC as an example to describe the technical solution of the present invention in detail through two embodiments.

Embodiment 1:

In this embodiment, 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.

Generally, 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.

In this embodiment, the dual mode terminal of the user is in the dual network coverage area of the 2G mobile communication system and the 3G mobile communication system, and the SCUDIF call supporting the dual BCIE is being performed. Since the user is in the mobile, the wireless resource changes, causing the user to switch from the 3G mobile communication system to the 2G mobile communication system, and the SCUDIF call is degraded to a voice call when the user is switched from the 3G mobile communication system to the 2G mobile communication system. ;

When the user's movement causes the radio resource condition to be satisfied, the user switches back from the 2G mobile communication system to the 3G mobile communication system again, and the handover process is performed according to the inter-system handover process of the voice service;

After the entire inter-system handover is completed, 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.

FIG. 2 is a flowchart of a method for implementing service change according to an embodiment of the present invention. Referring to Figure 2, 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.

Step 202: The BSC-A sends a handover request message (A-HO_Required) to the MSC-A through the A interface.

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.

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.

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.

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.

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.

So far, the switching between the voice service systems from the 2G mobile communication system to the 3G mobile communication system is completed, and the service change process of the present invention will be performed below.

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.

During the call setup phase, the MSC in the 3G mobile communication system that the user accesses will record the user's service capability value. During the call, although the user may switch to another network, 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. For example, in this embodiment, 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.

In this step, 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.

Therefore, only the R C devices supporting the 3GPP TS R6 and later versions can support the dual configuration of user capabilities. Therefore, according to the protocol versions supported by RNC-B, the following two cases are described:

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.

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.

In this step, 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.

At this point, the inter-system handover is completed, and the user's service has been modified to the SCUDIF call service.

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.

If the modification in step 215.2d fails, that is, the second modification request fails, no modification attempt is made.

At this point, 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;

After the handover between the entire systems is completed, 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:

In this embodiment, 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.

When the user's movement causes the radio resource condition to be satisfied, 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. Referring to FIG. 3, 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 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.

Step 302: The BSC-A sends a handover request message (A-HO_Required) to the MSC-A through the A interface.

Step 303: The MSC_A requests inter-system handover (MAP_Prep_HO_REQ) to the MSC-B of the 3G mobile communication system through the Mobile Application Part (MAP) signaling.

Step 304: MSC_B sends a relocation request (Iu_Relocation_Request) to the RNC-B, requesting the RNCJB of the 3G mobile communication system to allocate the handover service resource; and, when the MSC_B determines that the user's service is degraded in the 2G mobile communication system Then, the RAB parameter of the relocation request message carries a dual configuration indicating that the multimedia is the preferred service and the voice is the optional service, to notify the RNC B to modify the service to the SCUDIF call service.

In this step, the method for determining whether the user's service is degraded in the 2G mobile communication system is the same as the method in the first step 215 of the embodiment. See the description of step 215 in the first embodiment.

In this step, 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 ^ ' '.

Because only RNC devices supporting 3GPP TS R6 and later versions can be supported. The dual capacity of the user is configured. Therefore, according to the version of the protocol supported by the RNC-B, the following two situations are described in this step:

The first case: If the R C device supports the 3GPP R and later versions, that is, RNC-B supports the dual configuration of user capabilities, go to step 305.1a.

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.

In this step, by carrying the dual configuration in the RAB parameter of the relocation request, a SCUDIF call supporting the dual BCIE is established directly under the 3G mobile communication system, thereby realizing the purpose of modifying the user's service to the SCUDIF call service.

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.

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.

Step 315: The MSC-B notifies the network and the called end user to perform service modification.

In this step, 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.

So far, the inter-system handover of the embodiment is completed, and the user's service is changed to multimedia. Preferred, voice-selectable SCUDIF call service.

It can be seen from the foregoing technical solution that, in the relocation process of the inter-system handover, 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;

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 uses the RAB parameter in the relocation request message to carry the multimedia as the preferred service and the voice as the optional service. Configure to notify the RNC to modify the service to the SCUDIF call service;

When the RC device supports the protocol version of 3GPP TS R6 and later, 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.

In the above two embodiments, 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.

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.

In addition, when the MSC notifies the RNC to perform service modification, the RAB assignment message carrying the multimedia list configuration or the relocation request message may also be used, which can guarantee the RNC. When the user capability is not configured, the service is promoted to the multimedia service. However, 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.

The specific implementation manner of the service modification method of the present invention has been described in detail above, and the specific embodiment of the mobile communication system of the present invention will be described below.

FIG. 4 is a schematic structural diagram of a 3G mobile communication system according to an embodiment of the present invention. Referring to FIG. 4, the system includes a core network device 410 and an access network device 420.

The core network device 410 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 notify the access network when determining that the service is degraded. The device 420 modifies the service to the SCUDIF call service. The access network device 420 is configured to modify the service to the SCUDIF call service according to the notification of the core network device 410.

Preferably, 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.

When the access network device 420 determines that the access network device 420 does not support the dual configuration of the user capability, 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;

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.

The specific implementation manners of the core network device and the access network device in the embodiments of the present invention are further described in detail below.

FIG. 5 is a schematic structural diagram of a core network device according to an embodiment of the present invention. Referring to FIG. 5, 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.

Preferably, 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;

Or, in the re-positioning process of the service switching from the 2G mobile communication system back to the 3G mobile communication system, the relocation request message carrying the dual configuration of the multimedia and the voice service is sent to the access network device.

The core network device shown in FIG. 5 may further include: a response analysis module 530. At this time, the first communication module 510 is configured to send a failure response from the access network device to the response analysis module 530;

The response analysis module 530 is configured to send, by the first communication module 520, the RAB assignment message carrying only the multimedia single configuration to the access network device, when the failure reason for the failure response is that the configuration is not supported.

FIG. 6 is a schematic structural diagram of a structure of an access network device according to an embodiment of the present invention. Referring to FIG. 6, 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.

Preferably, 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.

Further, 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.

It can be seen from the above embodiments that 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.

The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

1. An unrestricted/restricted digital information service change and fallback SCUDIF call is switched from the third generation mobile communication 3G mobile communication system to the second generation mobile communication 2G mobile communication system, and then switched back to the 3G mobile communication system by the 2G mobile communication system The business change method of the time, characterized in that the method comprises the following steps:

The core network in the 3G mobile communication system determines that the switched back service is degraded in the 2G mobile communication system, and notifies the access network to modify the service to the SCUDIF call service;

The access network modifies the service to a SCUDIF call service according to the notification.

2. The method according to claim 1, wherein the method of determining, by the core network in the 3G mobile communication system, that the switched back service is degraded in the 2G mobile communication system is:

The core network in the 3G mobile communication system is compared with the switched back service according to the value of the user service capability recorded in the call setup phase, and the handover is determined when the user service capability value is different from the switched back service. The returned service is degraded in the 2G mobile communication system.

The method according to claim 2, wherein the method for recording the user service capability value of the core network in the 3G mobile communication system is:

In the call setup phase of the user terminal, the mobile switching center MSC of the 3G mobile communication system accessed by the user terminal records the user service capability value.

4. The method according to claim 1, wherein the method for the core network to notify the access network to modify the service to the SCUDIF call service is:

The core network sends a radio access bearer RAB assignment message carrying the dual configuration of the multimedia and the voice service to the access network, or a relocation request message carrying the multimedia and voice service dual configuration; the RAB assignment message is in accordance with the voice service handover process. , switch the business back to 3G shift After the communication system is sent;

The relocation request message is sent in a relocation process in which the service is switched from the 2G mobile communication system back to the 3G mobile communication system; the RAB parameter of the relocation request message carries the multimedia and voice service dual configuration;

The access network modifies the service to the SCUDIF call service according to the notification: the access network modifies the service to the SCUDIF call service according to the configuration information carried in the RAB assignment message or the relocation request message.

5. The method of claim 4, wherein

When the access network supports the dual configuration of the user capability, the access network continues to perform the operation of modifying the service to the SCUDIF call service, and further returns a corresponding successful response to the core network after modifying the service to the SCUDIF call service.

Otherwise, a corresponding failure response is returned to the core network.

The method according to claim 5, wherein the failure response returned by the access network to the core network includes a failure cause value;

When the message sent by the core network to the access network is an RAB assignment message, and the reason for the failure is that the configuration is not supported, the core network sends an RAB assignment message that only carries the multimedia configuration to the access network;

The access network modifies the service to the SCUDIF call service according to the notification: the access network modifies the service into a multimedia service according to the RAB assignment message;

The access network further returns a RAB assignment success response to the core network after modifying the service to the multimedia service.

The method according to claim 4, wherein the type of the dual configuration of the multimedia and voice services is specified by a policy set in advance in the core network;

The dual configuration type includes: 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 method according to claim 7, wherein the dual configuration of the multimedia and voice services is: dual configuration in which multimedia is the preferred service and voice is the optional service;

The method for carrying the dual configuration of the multimedia and the voice service is: configuring the preferred service of the RAB assignment message or the RAB parameter in the relocation request message as a multimedia service, and configuring the voice service in the optional RAB configuration cell value;

The access network modifies the service to the SCUDIF call service according to the notification: the access network modifies the service to the multimedia preferred and voice selectable SCUDIF call service according to the dual configuration.

The method according to claim 7, wherein the dual configuration of the multimedia and voice services is: a dual configuration in which voice is a preferred service and multimedia is an optional service;

The method for carrying the dual configuration of the multimedia and the voice service is: configuring the preferred service of the RAB assignment message or the RAB parameter in the relocation request message as a voice service, and configuring the multimedia service in the optional RAB configuration cell value;

The access network modifies the service to the SCUDIF call service according to the notification: the access network modifies the service to a voice-preferred, multimedia-selectable SCUDIF call service according to the dual configuration.

The method according to claim 9, wherein after the access network changes the service to the voice-preferred, multimedia-selectable SCUDIF call service, the method further includes:

When the radio resource is satisfied, the access network requests the core network to modify the voice service into a multimedia service.

The method according to claim 1, wherein the method for the core network to notify the access network to modify the service to the SCUDIF call service is:

The core network sends a radio access bearer RAB assignment message carrying the multimedia single configuration to the access network, or carries a relocation request message configured by the multimedia list;

The RAB assignment message switches the service back to the 3G mobile according to the voice service switching process. After the communication system is sent;

The relocation request message is sent during a relocation process in which the service is switched from the 2G mobile communication system back to the 3G mobile communication system; and the RAB parameter of the relocation request message carries the multimedia list configuration;

The access network modifies the service to the SCUDIF call service according to the notification: the access network modifies the service into a multimedia service according to the configuration information carried in the RAB assignment message or the relocation request message.

The method according to claim 4 or 11, wherein the method for the core network to notify the access network to modify the service to the SCUDIF call service is:

The mobile switching center of the core network sends an RAB assignment message carrying the service configuration information or a relocation request message carrying the service configuration information to the radio network controller RNC of the access network;

The access network modifies the service to the SCUDIF call service according to the notification: R C modifies the service to the SCUDIF call service according to the service configuration information carried in the RAB assignment message or the relocation request message.

13. A 3G mobile communication system, the system comprising a core network device and an access network device, wherein:

The core network device is 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 connection when determining that the service is quality The network access 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 3G mobile communication system according to claim 13, wherein: the core network device is configured to: after switching the service back to the 3G mobile communication system according to a voice service switching process, to the The access network device sends multimedia, language The RAB assignment message of the dual configuration of the voice service; or, for transmitting the multimedia and voice service to the access network device during the relocation process of the service switching from the 2G mobile communication system back to the 3G mobile communication system Dual configured relocation request message;

The access network device is configured to modify the service to a SCUDIF call service according to the configuration information carried in the RAB assignment message or the relocation request message.

15. The system of claim 14 wherein:

When the access network device determines that the access network device does not support the dual configuration of the user capability, the failure reason for returning the failure to the core network device is a failure response that is not supported by the configuration;

When the core network device analyzes that the failure reason is a failure response that is not supported by the configuration, the core network device sends an RAB assignment message that carries only the multimedia configuration to the access network device.

16. A core network device in a 3G mobile communication system, comprising: a service determination module and a first communication module;

17. The core network device of claim 16, wherein:

The first communication module is configured to: after the access network device switches the service back to the 3G mobile communication system according to the voice service switching process, send the RAB assignment message carrying the dual configuration of the multimedia and the voice service to the access network device. ;

Or, in the relocation process of the service switching from the 2G mobile communication system back to the 3G mobile communication system, the relocation request message carrying the dual configuration of the multimedia and the voice service is sent to the access network device.

The core network device according to claim 17, further comprising: a response analysis module; The first communication module is configured to send a failure response from the access network device to the response analysis module;

And the response analysis module is configured to send, by the first communication module, an RAB assignment message that only carries the multimedia configuration to the access network device, when the failure reason of the failure response is that the configuration is not supported.

An access network device in a 3G mobile communication system, comprising: a service modification module and a second communication module;

20. The access network device of claim 19, wherein:

The second communication module is configured to send an RAB assignment message or a relocation request message that carries configuration information 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 configuration information carried in the RAB assignment message or the relocation request message.

The access network device according to claim 20, further comprising a determining module;

The determining module is configured to determine whether the access network device supports the dual configuration of the user capability, and when determining that the access network device does not support the dual configuration of the user capability, the determining, by the second communication module, the device to the core network device The reason for the return failure is a failure response that is not supported by the configuration.