CN112135307B

CN112135307B - Telephone response method and terminal

Info

Publication number: CN112135307B
Application number: CN202010839175.7A
Authority: CN
Inventors: 雷显调; 孙兵
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2016-09-30
Filing date: 2016-09-30
Publication date: 2022-06-10
Anticipated expiration: 2036-09-30
Also published as: CN107889129A; CN112135307A; CN107889129B

Abstract

The embodiment of the invention provides a telephone response method and a telephone response terminal, relates to the field of communication, and can shorten calling time delay and improve called call completion rate. The method comprises the following steps: the terminal sends an extended service request message to the mobile management network element, wherein the extended service request message is used for indicating that the terminal needs to fall back to a global system for mobile communication (GSM) or an evolved Universal Terrestrial Radio Access Network (UTRAN); when the terminal determines that the mobile management network element receives the extended service request message and the terminal does not receive the different system fallback indication sent by the base station when the preset time is up, the terminal determines that the different system fallback indication sent by the base station cannot be received; the terminal falls back to GSM/UTRAN to perform the circuit switched CS domain telephony flow. The embodiment of the invention is applied to the quick fallback in the CSFB.

Description

Telephone response method and terminal

This application is a divisional application of a prior application entitled method and terminal for telephone response, patent application No. 201610877935.7.

Technical Field

The present invention relates to the field of communications, and in particular, to a method and a terminal for telephone response.

Background

With the rapid development of mobile communication technology, the 3rd Generation Partnership Project (3 GPP) of the international organization for standardization proposes a Long Term Evolution (LTE) network architecture, provides a high-bandwidth wireless access network, and has various advantages of high data transmission rate, low delay, packet data optimization, and the like. Currently, a voice service is still one of the main services of each operator, for example, because the initial coverage of LTE Network setup is insufficient, for example, a Network protocol Multimedia System (IMS) adopted by LTE is still in the process of building, most User Equipment (UE) and networks do not support IMS yet, and the building of a Global System for Mobile Communication (GSM) or a Terrestrial Radio Access Network (umts) (universal Mobile Telecommunications System) Radio Access Network (UTRAN) is mature, in view of the utilization of existing resources and the cost of Network setup, a User can be simultaneously attached to LTE and GSM/UTRAN networks, when the User calls or is called, the LTE Network is switched to the GSM/UTRAN Network to complete a voice call, and when the call is ended, the UE returns to LTE properly.

In the prior art, a transitional scheme for solving voice call on LTE is to use a Circuit Switched Fallback (CSFB) technology. In CSFB, the LTE fast fallback to GSM/UTRAN procedure is performed by cooperation between UE, core network and Evolved Node B (eNodeB). As shown in fig. 1, the fall-back process is: when a calling party or a called party is received on LTE, UE sends an air interface message to inform a core network that the core network needs to fall back to GSM/UTRAN currently; after receiving the CSFB instruction of the UE, the core network informs an eNodeB of a fallback instruction; when the eNodeB receives the fallback indication, the eNodeB informs the UE to start the inter-system measurement, and then informs the UE to fall back to the GSM/UTRAN through the inter-system processes such as redirection and the like, if the eNodeB does not start the inter-system measurement, the eNodeB can bring the currently configured inter-system adjacent frequency point information to the UE; and the UE falls back to the GSM/UTRAN according to the different system instructions of redirection, switching and the like of the eNodeB, and the terminal falls back to the GSM/UTRAN to execute a Circuit Switched (CS) domain telephone flow.

In the above process, when the eNodeB does not receive the CSFB indication of the core network due to the coordination abnormality among the network elements, or the eNodeB may not issue an inter-system indication to the terminal due to the coordination abnormality of the network elements, or the UE may not receive the redirection indication of the base station within a period of time due to the sudden change of signal quality, which may result in a failure of the call and affect the user experience.

Disclosure of Invention

The embodiment of the invention provides a telephone response method and a terminal, which can shorten calling time delay and improve called call completing rate.

In one aspect, a method for telephone response is provided, comprising: the terminal sends an extended service request message to the mobile management network element, wherein the extended service request message is used for indicating that the terminal needs to fall back to a global system for mobile communication (GSM) or an evolved Universal Terrestrial Radio Access Network (UTRAN); when the terminal determines that the mobile management network element receives the extended service request message and the terminal does not receive the different system fallback indication sent by the base station when the preset time is up, the terminal determines that the different system fallback indication sent by the base station cannot be received; the terminal falls back to GSM or UTRAN to perform the circuit switched CS domain telephony flow. And if the calling terminal or the called terminal determines that the foreign system fallback indication sent by the base station cannot be received, the calling terminal or the called terminal autonomously falls back to the GSM or UTRAN to execute the CS domain telephone process. Compared with the prior art, the calling terminal and the called terminal do not need to wait for receiving the different-system fallback indication all the time, but determine that the network is abnormal when the preset time is reached, and can autonomously fall back in advance, namely, the terminal recognizes that the different-system fallback indication at the network side cannot be received, and then autonomously falls back in advance, so that the calling time delay is shortened, and the call completion rate of the called terminal is improved.

In a possible design, if the terminal does not receive the inter-system fallback indication sent by the base station when the preset time is reached, the determining, by the terminal, that the inter-system fallback indication sent by the base station cannot be received includes: when the preset time is up, if the terminal does not receive an indication for starting the inter-system measurement sent by the base station, or does not receive a first inter-system fallback indication after receiving the indication for starting the inter-system measurement, the terminal determines that the inter-system indication sent by the base station cannot be received; starting a different system measurement instruction for instructing a terminal to measure frequency point information of a different system neighbor cell, wherein a first different system fallback instruction comprises the frequency point information of the different system neighbor cell reported by the terminal; or when the preset time is up, if the terminal does not receive the second different system drop-back indication sent by the base station, the terminal determines that the different system indication sent by the base station cannot be received; the second different system fallback indication comprises frequency point information of different system neighbor cells configured by the base station. That is, when the calling terminal or the called terminal does not receive the inter-system fallback indication sent by the base station yet when the preset time is reached, it is determined that the inter-system measurement starting indication or the first inter-system fallback indication or the second inter-system fallback indication sent by the base station cannot be received, so that the calling terminal and the called terminal can autonomously select a network in advance to determine a target cell in the GSM/UTRAN and access the target cell to execute a CS domain telephone flow, thereby shortening the calling time delay and improving the called call completion rate.

In one possible design, the preset time is greater than or equal to 3s and less than 10 s. Compared with the prior art, the method needs to wait for a period of time, for example, the network side different system fallback indication cannot be received after 10 seconds, the preset time in the method can enable the calling terminal and the called terminal to autonomously fall back in advance, the calling terminal does not need to wait for 10 seconds, the called terminal cannot fail in conversation for 10 seconds, the calling time delay is shortened, and the called call completion rate is improved.

In one possible design, the falling of the terminal back to GSM or UTRAN to perform the circuit switched CS domain telephony flow includes: the terminal determines a target cell in GSM or UTRAN through network selection, and accesses the target cell to execute a CS domain telephone process. That is, after determining that the inter-system measurement starting indication or the first inter-system fallback indication or the second inter-system fallback indication sent by the base station cannot be received, the calling terminal or the called terminal determines a target cell in GSM or UTRAN through autonomous network selection, and accesses the target cell to execute a CS domain call process. Therefore, the calling terminal and the called terminal can autonomously select the network in advance to determine the target cell in the GSM or UTRAN and access the target cell to execute the CS domain telephone process, thereby shortening the calling time delay and improving the called call communication rate.

In one possible design, the method further includes: if the terminal receives the different system fallback indication sent by the base station before the preset time is reached, the terminal determines a target cell in GSM or UTRAN to be switched through a redirection process or a switching process, and executes a CS domain telephone process in the target cell. Therefore, the terminal can fall back according to the different-system fall back indication sent by the base station, and then the CS domain telephone flow is executed in the target cell, the automatic network selection is not needed for the fall back, the fall back time delay is shorter, and the success rate is higher.

In yet another aspect, a telephone responsive terminal is provided, comprising: a sending unit, configured to send an extended service request message to a mobility management element, where the extended service request message is used to indicate that a terminal needs to fall back to a global system for mobile communications GSM or an evolved universal terrestrial radio access network UTRAN; a determining unit, configured to determine that the mobility management network element receives the extended service request message, and does not receive the inter-system fallback indication sent by the base station when a preset time arrives, and then determines that the inter-system fallback indication sent by the base station cannot be received; and a fallback unit for fallback to the GSM or UTRAN to execute the CS domain telephony process.

In one possible design, the determination unit is configured to: when the preset time is up, if the inter-system measurement starting instruction sent by the base station is not received, or the first inter-system fallback instruction is not received after the inter-system measurement starting instruction is received, determining that the inter-system instruction sent by the base station cannot be received; starting a different system measurement instruction for instructing a terminal to measure frequency point information of a different system neighbor cell, wherein a first different system fallback instruction comprises the frequency point information of the different system neighbor cell reported by the terminal; or when the preset time is up, if a second different system drop-back instruction sent by the base station is not received, determining that the different system instruction sent by the base station cannot be received; the second different system fallback indication comprises frequency point information of different system neighbor cells configured by the base station.

In one possible design, the predetermined time is greater than or equal to 3s and less than 10 s.

In one possible design, falling back to GSM or UTRAN to perform a circuit switched CS domain telephony flow, the determining unit is further configured to: and determining a target cell in the GSM or UTRAN through network selection, and accessing the target cell to execute a CS domain telephone process.

In one possible design, the determination unit is further configured to: if the terminal receives an inter-system fallback indication sent by the base station before the preset time is reached, the determining unit determines a target cell in the GSM or UTRAN to be switched through a redirection process or a switching process, and executes a CS domain telephone process in the target cell.

In yet another aspect, a computer storage medium is provided for storing computer software instructions for the apparatus described above, including a program designed for performing the above aspects.

In the embodiment of the invention, when the terminal does not receive the different system drop indication sent by the base station when the preset time is up, the terminal determines that the different system measurement starting indication or the first different system drop indication or the second different system drop indication sent by the base station cannot be received, then determines the target cell in GSM or UTRAN through autonomous network selection, and accesses the target cell to execute the CS domain telephone process. Compared with the prior art, the calling terminal does not need to wait for a long time to determine that the CSFB fallback flow fails, the called terminal does not fail in conversation for 10 seconds, the calling terminal and the called terminal can autonomously select a network in advance to determine a target cell in GSM or UTRAN and access the target cell to execute a CS domain telephone flow, the calling time delay is shortened, and the called call completing rate is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a flow chart of CSFB fall-back signal interaction provided in the prior art;

FIG. 2 is a diagram of a network architecture according to an embodiment of the present invention;

fig. 3 is a hardware structure diagram of a terminal according to an embodiment of the present invention;

fig. 4 is a flow chart of a method for telephone response according to an embodiment of the present invention;

FIG. 5 is a flow chart of signal interaction of telephone response according to an embodiment of the present invention;

fig. 6 is a flow chart of a method for telephone response according to an embodiment of the present invention;

FIG. 7 is a signal interaction flow diagram of a telephone response according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a terminal according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a terminal according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a terminal according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.

The embodiment of the invention can be applied to the CSFB fast falling process and other telephone response processes, and the application is not limited.

The network architecture applied in the embodiment of the present invention may include a mobility management network element, a base station, and a terminal under the coverage of the base station, as shown in fig. 2. The mobile management network element has access control, mobility management, session management function, network element selection function and the like. The base station has functions of radio resource management, selection of MME during UE connection, routing of user plane data, organization and transmission of paging messages, organization and transmission of broadcast messages, and measurement report configuration for mobility or scheduling purposes. The terminal can be a mobile phone, a telephone watch and other equipment or terminals; the mobility management network element may be a Mobility Management Entity (MME) or a Mobile Switching Center (MSC).

Fig. 3 is a schematic structural diagram of a terminal according to an embodiment of the present invention, where the terminal according to the embodiment of the present invention may be used to implement the method according to the embodiments of the present invention shown in fig. 4 and fig. 6, and for convenience of description, only the part related to the embodiment of the present invention is shown, and details of the specific technology are not disclosed, please refer to the embodiments of the present invention shown in fig. 4 and fig. 6.

As shown in fig. 3, taking a terminal as a mobile phone as an example, the mobile phone 300 includes: RF (radio frequency) circuit 320, memory 330, input unit 340, display unit 350, gravity sensor 360, audio circuit 370, processor 380, and power supply 390. Those skilled in the art will appreciate that the handset configuration shown in fig. 3 is not intended to be limiting and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.

The following specifically describes each constituent component of the mobile phone 300 with reference to fig. 3:

RF circuit 320 may be used for receiving and transmitting signals during a message or call;

the memory 330 can be used for storing software programs and modules, and the processor 380 executes various functional applications and data processing of the mobile phone 300 by running the software programs and modules stored in the memory 330; the input unit 340 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the cellular phone 300; the display unit 350 may be used to display information input by the user or information provided to the user and various menus of the mobile phone 300; a gravity sensor 360 that can detect the acceleration of the mobile phone in each direction (generally, three axes), and the like; the audio circuitry 370, speaker 371, microphone 372 may provide an audio interface between a user and the handset 300; the processor 380 is a control center of the mobile phone 300, connects various parts of the whole mobile phone by using various interfaces and lines, and executes various functions and processes data of the mobile phone 300 by running or executing software programs and/or modules stored in the memory 330 and calling data stored in the memory 330, thereby integrally monitoring the mobile phone; the handset 300 also includes a power supply 390 (e.g., a battery) that powers the various components. Although not shown, the mobile phone 300 may further include a WiFi (wireless fidelity) module, a bluetooth module, and the like, which are not described in detail herein.

The following description will take the fast fallback of the CSFB technique as an example. The basic idea of the invention is: the terminal sends an extended service request message to the MME, wherein the extended service request message is used for indicating that the terminal needs to fall back to the GSM or UTRAN; when the terminal determines that the MME receives the extended service request message and the terminal does not receive the heterogeneous system fallback indication sent by the base station when the preset time is up, the terminal determines that the heterogeneous system fallback indication sent by the base station cannot be received; the terminal autonomously falls back to the GSM or UTRAN to execute the CS domain telephone flow. Therefore, when the terminal recognizes that the different system fallback indication sent by the base station cannot be received, the calling waiting time delay is reduced, and the called party can be successfully connected, namely, the calling time delay is reduced, and the called party call completing rate is improved.

The following describes a case where the terminal performs a telephone response for the calling terminal.

An embodiment of the present invention provides a method for telephone response, as shown in fig. 4, including:

401. the calling terminal sends an extended service request message to the MME, wherein the extended service request message is used for indicating that the calling terminal needs to fall back to the GSM or UTRAN;

the Extended Service Request message (Extended Service Request) may carry a CSFB indication, which is used to notify the MME that the calling end is going to perform a CS domain telephony procedure at this time and needs to fall back to the GSM or UTRAN.

402. The MME informs the base station that the calling end needs to be directed to fall back to GSM or UTRAN, and then proceeds to step 403 or 405.

The MME may send a CSFB indication to inform the base station to direct the calling end to fall back to GSM or UTRAN.

403. When the calling terminal determines that the MME receives the extended service request message and the terminal does not receive the inter-system fallback indication sent by the base station when the preset time is up, the calling terminal determines that the inter-system fallback indication sent by the base station cannot be received.

As shown in fig. 5, a calling end sends an extended service request message to an MME, the MME issues a CSFB instruction to notify a base station to direct the calling end to fall back to GSM or UTRAN, the base station can send an inter-system measurement start instruction according to different network implementations, the calling end reports frequency point information of inter-system neighbor cells measured by the calling end itself to the base station after receiving the inter-system measurement start instruction issued by the base station, and the base station sends a first inter-system fall instruction including frequency point information of the inter-system neighbor cells measured by the terminal to the terminal; or the base station directly sends the second different system fallback indication containing the self-configured frequency point information of the adjacent cell of the different system to the terminal. When the MME receives the extended service request message, a response message is fed back to the calling end to notify the calling end that the extended service request message is successfully received, at this time, the calling end needs to start a timer, and when the preset time is reached, the calling end does not receive an indication for starting the inter-system measurement sent by the base station, or does not receive an indication for starting the inter-system measurement but does not receive a first inter-system fallback indication, or does not receive a second inter-system fallback indication sent by the base station, the calling end determines that the inter-system fallback indication sent by the base station cannot be received, that is, the calling end identifies that the inter-system fallback indication sent by the base station cannot be received.

The preset time is greater than or equal to 3s and less than 10 s. The reason for this is that the 3GPP 24301 specifies that the terminal can autonomously fall back to the GSM or UTRAN without receiving the inter-system fall-back instruction within 10 seconds, under normal conditions, the inter-system fall-back instruction will be sent to the terminal within a short time, and if the inter-system fall-back instruction cannot be sent normally, statistics shows that the time taken by the user that can normally receive the inter-system fall-back instruction does not exceed 3 seconds, and therefore, if the terminal does not receive the inter-system fall-back instruction sent by the base station within 3 seconds, it can be determined that the inter-system fall-back instruction sent by the base station cannot be received any more.

404. The calling terminal determines a target cell in GSM or UTRAN through network selection, and accesses the target cell to execute a CS domain telephone process.

When the calling terminal determines that the inter-system fallback indication sent by the base station cannot be received, the calling terminal selects a PLMN with the best signal quality after searching a plurality of Public Land Mobile Networks (PLMNs) or selects a PLMN with the best signal quality from the PLMNs registered before the terminal is started up last time or departs from a service area, then performs full-band search on the selected PLMN with the best signal quality according to the capability and setting of the calling terminal, searches a cell with the strongest signal on each frequency point, and selects the cell with the strongest signal as a target cell to execute a CS domain telephone process; if the terminal stores the cell information of the PLMN with the best signal quality, the cells are searched, and the cell with the strongest signal is selected as the target cell to execute the CS domain telephone process.

405. If the calling terminal receives the different system fallback indication sent by the base station before the preset time is reached, the calling terminal determines a target cell in GSM or UTRAN to be switched through a redirection process or a switching process, and executes a CS domain telephone process in the target cell.

The redirection process refers to that the terminal is connected with the network of another system after being disconnected with the current network. Two processes are involved here: 1) leaving the current network: and the terminal is disconnected with the current network and enters an idle state. The network side can carry the frequency point information of the target redirection network when sending the redirection instruction so as to help the terminal to quickly access a new network; 2) accessing a new network: the terminal accesses the target cell according to the target redirection network frequency point information provided by the original network and executes the CS domain telephone process in the target cell.

The switching process is that under the condition that the terminal is always in a connected state, the frequency point information of the target redirection network carried by the network side when issuing the redirection instruction is quickly accessed into a new network, and the CS domain telephone process is executed in the target cell.

In the embodiment of the invention, when the calling terminal does not receive the different system drop indication sent by the base station when the preset time is up, the calling terminal determines that the different system measurement starting indication or the first different system drop indication or the second different system drop indication sent by the base station cannot be received, determines the target cell in GSM or UTRAN through autonomous network selection, and accesses the target cell to execute the CS domain telephone process. Compared with the prior art, the calling end can not cause call failure when the calling end can not receive the different system fallback indication, or the calling end does not need to wait for a long time to perform fallback, the calling end can autonomously select a network in advance to determine a target cell in GSM or UTRAN when recognizing that the different system fallback indication can not be received, and accesses the target cell to execute a CS domain telephone process, so that calling time delay is shortened.

The following describes a case where the terminal performs a telephone response for the called terminal.

An embodiment of the present invention provides a method for telephone response, as shown in fig. 6, including:

601. and the MME sends a CS service notification message to the called terminal.

When a calling terminal initiates a voice call, if the MME receives a call request sent by the calling terminal, the MME sends a CS service notification message to a called terminal for calling the called terminal.

602. The called terminal sends an extended service request message to the MME, and the extended service request message is used for indicating that the called terminal needs to fall back to the GSM or UTRAN.

The extended service request message carries a CSFB indication for notifying the called end to fall back to GSM or UTRAN.

603. The MME informs the base station that the called end needs to be directed to fall back to GSM or UTRAN.

604. When the called terminal determines that the MME receives the extended service request message and does not receive the inter-system fallback indication sent by the base station when the preset time is up, the called terminal determines that the inter-system fallback indication sent by the base station cannot be received;

fig. 7 shows a phone response procedure of the called end in the embodiment shown in fig. 6, 1) the MSC sends a paging message to the MME, 2) the MME sends a CS service notification to the called end, 3) the called end sends an extended service request message to the MME after receiving the CS service notification sent by the MME, and 4) the MME sends a CSFB instruction to the base station to instruct the base station to direct the called end to fall back. 5) The base station may send an indication to the called terminal to start the inter-system measurement, receive an inter-system measurement result returned by the called terminal, and then send a first inter-system fallback indication to the called terminal, or the base station directly sends a second inter-system fallback indication to the called terminal, when the called terminal receives a response message sent by the MME to determine that the MME receives the extended service request message, the called terminal needs to start a timer, and when a preset time arrives, the called terminal does not yet receive the indication to start the inter-system measurement or the first inter-system fallback indication or the second inter-system fallback indication sent by the base station, and then the called terminal determines that the inter-system fallback indication sent by the base station cannot be received. It should be understood that, if the calling terminal pages the called terminal through the MSC, the MSC needs to send a paging message to the MME, and then send a CS service notification message to the called terminal through the MME. 6) Once the called end receives the heterogeneous system measurement indication and the first heterogeneous system drop indication sent by the base station, or receives the second heterogeneous system drop indication, the called end starts to enter the CS domain telephone process.

The step 403 may be referred to as how the preset time is specifically set.

605. The called terminal determines the target cell in GSM or UTRAN through network selection, and accesses the target cell to execute the CS domain telephone process.

How the called terminal determines the target cell in GSM or UTRAN through network selection can refer to how the calling terminal determines the target cell in GSM or UTRAN through network selection in step 404.

606. If the called terminal receives the different system fallback indication sent by the base station before the preset time is reached, the called terminal determines a target cell in GSM or UTRAN to be switched through a redirection process or a switching process, and executes a CS domain telephone process in the target cell.

The redirection procedure or the handover procedure of the called end may refer to the implementation manner of the calling end in step 405.

In the embodiment of the invention, when the called terminal does not receive the inter-system measurement starting instruction or the first inter-system fallback instruction or the second inter-system fallback instruction sent by the base station when the preset time is up, the called terminal determines that the inter-system fallback instruction sent by the base station cannot be received, determines the target cell in GSM or UTRAN through autonomous network selection, and accesses the target cell to execute the CS domain telephone process. Compared with the prior art, the call failure can not be caused when the called terminal cannot receive the different system fallback indication, the called terminal can autonomously select a network in advance to determine the target cell in the GSM or UTRAN when recognizing that the different system fallback indication cannot be received, and accesses the target cell to execute the CS domain telephone process, so that the call passing rate of the called terminal is improved.

The above description mainly introduces the scheme provided by the embodiment of the present invention from the perspective of the terminal. It is understood that the terminal includes corresponding hardware structures and/or software modules for performing the respective functions in order to implement the above-described functions. Those skilled in the art will readily appreciate that the present invention can be implemented in hardware or a combination of hardware and computer software using the algorithm steps described in connection with the embodiments disclosed herein. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

The embodiment of the present invention may perform the division of the functional modules on the terminal according to the above method example, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, the division of the modules in the embodiment of the present invention is schematic, and is only a logic function division, and there may be another division manner in actual implementation.

In the case of dividing the functional modules by corresponding functions, fig. 8 shows a possible structural diagram of the terminal 8 according to the above embodiment, where the terminal includes: transmission section 801, determination section 802, and fallback section 803. The sending unit 801 is configured to support the terminal to perform the process 401 in fig. 4 or the process 602 in fig. 6; the determining unit 802 is used to support the terminal to perform the process 403 in fig. 4 and the process 604 in fig. 6 and the process 606 in fig. 405; fallback unit 803 is configured to support the terminal to perform procedure 405 in fig. 4 or procedure 606 in fig. 6. All relevant contents of each step related to the above method embodiment may be referred to the functional description of the corresponding functional module, and are not described herein again.

In the case of integrated units, fig. 9 shows a possible structural diagram of the terminal involved in the above-described embodiment. The terminal 9 includes: a processing module 901 and a communication module 902. The processing module 901 is configured to control and manage actions of the terminal, for example, the processing module 901 is configured to support the terminal to execute 403-405 in fig. 4 or 604-606 in fig. 6, and the communication module 902 is configured to support communication between the terminal and other network entities, for example, communication with a server, downloading an installation package of an application from the server, and the like. The terminal may further include a storage module 903, configured to store program codes and data of the terminal, for example, frequency point information carried by the inter-system indication in the embodiment of the present invention.

The Processing module 901 may be a Processor or a controller, such as a Central Processing Unit (CPU), a general-purpose Processor, a Digital Signal Processor (DSP), an Application-Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, DSPs, and microprocessors, among others. The communication module 902 may be a transceiver, a transceiving circuit or a communication interface, etc. The storage module 903 may be a memory.

When the processing module 901 is a processor, the communication module 902 is a transceiver, and the storage module 903 is a memory, the terminal according to the embodiment of the present invention may be the terminal shown in fig. 10.

Referring to fig. 10, the terminal 10 includes: a processor 1001, a transceiver 1002, a memory 1003, and a bus 1004. The transceiver 1002, the processor 1001, and the memory 1003 are connected to each other by a bus 1004; bus 1004 may be a peripheral component interconnect standard

A (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 10, but this is not intended to represent only one bus or type of bus.

The steps of a method or algorithm described in connection with the disclosure herein may be embodied in hardware or in software instructions executed by a processor. The software instructions may be comprised of corresponding software modules that may be stored in Random Access Memory (RAM), flash Memory, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), registers, a hard disk, a removable disk, a compact disc Read Only Memory (CD-ROM), or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an ASIC. Additionally, the ASIC may reside in a core network interface device. Of course, the processor and the storage medium may reside as discrete components in a core network interface device.

Those skilled in the art will recognize that, in one or more of the examples described above, the functions described in this invention may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.

The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the present invention should be included in the scope of the present invention.

Claims

1. A method for telephony response applied to a terminal, comprising:

sending an extended service request message to a mobile management network element, wherein the extended service request message is used for indicating that the terminal needs to fall back to a global system for mobile communications (GSM) or an evolved Universal Terrestrial Radio Access Network (UTRAN);

when the preset time is up, the terminal does not receive an inter-system fallback indication sent by a base station, and the terminal autonomously falls back to the GSM or the UTRAN to execute a Circuit Switching (CS) domain telephone process;

wherein the terminal does not receive the inter-system fallback indication sent by the base station, and the inter-system fallback indication includes at least one of the following:

the terminal does not receive a different system starting measurement instruction sent by the base station, and the different system starting measurement instruction is used for indicating the terminal to measure frequency point information of adjacent cells of different systems;

the terminal does not receive a first inter-system fallback indication after receiving the inter-system measurement starting indication, wherein the first inter-system fallback indication comprises frequency point information of the inter-system neighbor cells reported by the terminal; or

And the terminal does not receive a second different system drop-back instruction sent by the base station, wherein the second different system drop-back instruction comprises frequency point information of a different system adjacent cell configured by the base station.

2. The method of claim 1, wherein the predetermined time is less than 10 seconds.

3. Method according to claim 1 or 2, characterized in that said preset time is greater than or equal to 3s and less than 10 s.

4. The method according to claim 1 or 2, wherein the autonomous fallback of the terminal to the GSM or UTRAN to perform a circuit switched CS domain telephony flow comprises:

and the terminal determines a target cell in the GSM or the UTRAN through autonomous network selection and accesses the target cell to execute the CS domain telephone process.

5. The method of claim 3, wherein autonomously falling back to the GSM or UTRAN by the terminal performing a circuit switched CS domain telephony flow comprises:

6. The method according to claim 1 or 2, characterized in that the method further comprises:

if the terminal receives the inter-system fallback indication sent by the base station before the preset time is reached, the terminal determines a target cell to be switched in the GSM or the UTRAN through a redirection process or a switching process, and executes the CS domain telephone process in the target cell.

7. The method of claim 3, further comprising:

8. The method of claim 4, further comprising:

9. The method of claim 5, further comprising:

10. An apparatus for telephone response applied to a terminal, comprising:

a function module, configured to send an extended service request message to a mobility management network element, where the extended service request message is used to indicate that the terminal needs to fall back to a global system for mobile communications GSM or an evolved universal terrestrial radio access network UTRAN;

a functional module, configured to enable the terminal to autonomously fall back to the GSM or the UTRAN for executing a circuit switched CS domain telephony flow when the terminal has not received a heterogeneous system fall back instruction sent by a base station when a preset time arrives;

11. The apparatus of claim 10, wherein the preset time is less than 10 s.

12. The apparatus according to claim 10 or 11, characterized in that said preset time is greater than or equal to 3s and less than 10 s.

13. The device according to claim 10 or 11, wherein the functional module for autonomously dropping back the terminal is specifically configured to:

and when the terminal does not receive a different system fallback indication sent by a base station when the preset time is up, enabling the terminal to determine a target cell in the GSM or the UTRAN through autonomous network selection, and accessing the target cell to execute the CS domain telephone process.

14. The apparatus according to claim 10 or 11, wherein the terminal further comprises:

a function module, configured to enable the terminal to determine a target cell in the GSM or UTRAN to be handed over through a redirection procedure or a handover procedure, and execute the CS domain telephony procedure in the target cell, when the inter-system fallback indication sent by the base station is received by the terminal before the preset time is reached.

15. A computer-readable medium, comprising: software instructions which, when executed by a processor of a terminal, are operable to implement:

16. The computer-readable medium of claim 15, wherein the predetermined time is less than 10 seconds.

17. The computer-readable medium according to claim 15 or 16, wherein the preset time is greater than or equal to 3s and less than 10 s.

18. The computer readable medium of claim 15 or 16, wherein the software instructions, when executed by the processor of the terminal, are configured to implement:

19. The computer-readable medium of claim 15 or 16, wherein the software instructions, when executed by the processor of the terminal, are further configured to implement: