CN116266935A

CN116266935A - Voice fallback method, device, terminal and readable storage medium

Info

Publication number: CN116266935A
Application number: CN202111539885.9A
Authority: CN
Inventors: 王洋洋; 杨晓东
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2021-12-15
Filing date: 2021-12-15
Publication date: 2023-06-20
Also published as: WO2023109679A1

Abstract

The application discloses a voice fallback method, a device, a terminal and a readable storage medium, which belong to the technical field of communication, and the voice fallback method in the embodiment of the application comprises the following steps: the terminal determines a target scheme according to the target information; the terminal executes voice fallback according to the target scheme; the target scheme is used for reducing the time delay of the voice fallback, and the target information comprises at least one of the following: first capability information of the terminal; the method comprises the steps of obtaining second capability information of first network side equipment, wherein the first network side equipment is network side equipment corresponding to a service cell of the terminal; the first indication information is used for indicating or configuring the target scheme; priority information of M schemes, the M schemes including the target scheme, and M being an integer greater than 1.

Description

Voice fallback method, device, terminal and readable storage medium

Technical Field

The application belongs to the technical field of communication, and particularly relates to a voice fallback method, a device, a terminal and a readable storage medium.

Background

In New Radio (NR), a terminal establishes a quality of service (Quality of Service flow, qoS flow) of an internet protocol multimedia subsystem (IP Multimedia Subsystem, IMS) voice when initiating or receiving an IMS voice call, and a base station (gNB) triggers a voice Fallback (Fallback) procedure after receiving the QoS flow, for example: evolved packet system (Evolved Packet System, EPS) Fallback or radio access technology (Radio Access Technology, RAT) Fallback procedure.

In the related art, a base station needs to wait for a terminal to perform inter-RAT (IRAT) measurement to obtain a measurement result, so that the configuration of the base station for issuing measurement is too late or the measurement duration of the terminal can affect the time delay of voice fallback.

Due to various reasons such as insufficient time of the terminal to the inter-RAT measurement or no measurement of the inter-RAT configuration, no measurement result exists before redirection or handover is performed, and further handover failure is caused when EPS/RAT Fallback based on handover is performed, so that the delay of EPS/RAT Fallback is too long. Or, when performing the redirection-based EPS/RAT Fallback, since the protocol specifies that the Frequency point (such as the evolved universal mobile network system terrestrial radio access (Evolved Universal Terrestrial Radio Access, EUTRA) Frequency point (Frequency)) of the long term evolution (Long Term Evolution, LTE) is issued by the gNB at the time of redirection, the LTE cell indicated by the serving cell (NR) of the terminal through the redirection signaling is not necessarily the cell with the highest reference signal received power (Reference Signal Received Power, RSRP), and meanwhile, blind redirection also has the problem of causing too long EPS/RAT Fallback delay due to unsuitable cell selection.

As can be seen, there is a problem in the related art that the voice call performance is reduced due to the excessively long EPS/RAT Fallback delay.

Disclosure of Invention

The embodiment of the application provides a voice Fallback method, a device, a terminal and a readable storage medium, which can solve the problem of poor voice call performance caused by overlong EPS/RAT Fallback time delay in the related technology.

In a first aspect, a voice fallback method is provided, the method comprising:

the terminal determines a target scheme according to the target information;

the terminal executes voice fallback according to the target scheme;

the target scheme is used for reducing the time delay of the voice fallback, and the target information comprises at least one of the following:

first capability information of the terminal;

the method comprises the steps of obtaining second capability information of first network side equipment, wherein the first network side equipment is network side equipment corresponding to a service cell of the terminal;

the first indication information is used for indicating or configuring the target scheme;

priority information of M schemes, the M schemes including the target scheme, and M being an integer greater than 1.

In a second aspect, a voice fallback device is provided and applied to a terminal, and the device includes:

The determining module is used for determining a target scheme according to the target information;

the execution module is used for executing voice fallback according to the target scheme;

first capability information of the terminal;

in a third aspect, there is provided a terminal comprising a processor and a memory storing a program or instructions executable on the processor, which when executed by the processor, implement the steps of the method as described in the first aspect.

In a fourth aspect, a terminal is provided, including a processor and a communication interface, where the processor is configured to determine a target scheme according to target information, and the communication interface is configured to perform voice fallback according to the target scheme;

First capability information of the terminal;

In a fifth aspect, there is provided a readable storage medium having stored thereon a program or instructions which when executed by a processor realizes the steps of the method according to the first aspect.

In a sixth aspect, there is provided a chip comprising a processor and a communication interface coupled to the processor for running a program or instructions to implement the method of the first aspect.

In a seventh aspect, there is provided a computer program/program product stored in a storage medium, the computer program/program product being executed by at least one processor to implement the steps of the speech fallback method according to the first aspect.

In the embodiment of the application, the terminal determines a target scheme according to target information; the terminal executes voice fallback according to the target scheme; the target scheme is used for reducing the time delay of the voice fallback, and the target information comprises at least one of the following: first capability information of the terminal; the method comprises the steps of obtaining second capability information of first network side equipment, wherein the first network side equipment is network side equipment corresponding to a service cell of the terminal; the first indication information is used for indicating or configuring the target scheme; and priority information of M schemes, the M schemes including the target scheme, and M being an integer greater than 1. Thus, when receiving or initiating the voice call, the terminal can determine a target scheme according to the target information and execute voice fallback according to the target scheme, so that the delay of the voice fallback is reduced by adopting the target scheme, and the voice call performance is improved by reducing the delay of the voice fallback. In addition, when the terminal has at least two selectable schemes capable of reducing the voice fallback time delay, the terminal can select one target scheme from the at least two schemes based on the target information, so that the problem that the terminal does not know which scheme is adopted to reduce the time delay of the voice fallback is avoided, and the reliability of the terminal for reducing the time delay of the voice fallback can be improved.

Drawings

Fig. 1 is a schematic structural diagram of a wireless communication system to which embodiments of the present application can be applied;

FIG. 2 is a schematic diagram of an EPS fallback mechanism;

FIG. 3 is a schematic illustration of measurement results satisfying the B1 event;

FIG. 4 is a schematic diagram of a RAT fallback mechanism;

FIG. 5 is a flowchart of a method for voice fallback according to an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of a voice fallback device according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a communication device according to an embodiment of the present application;

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

Detailed Description

Technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application are within the scope of the protection of the present application.

The terms first, second and the like in the description and in the claims, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in sequences other than those illustrated or otherwise described herein, and that the terms "first" and "second" are generally intended to be used in a generic sense and not to limit the number of objects, for example, the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/" generally means a relationship in which the associated object is an "or" before and after.

It is noted that the techniques described in embodiments of the present application are not limited to long term evolution (Long Term Evolution, LTE)/LTE evolution (LTE-Advanced, LTE-a) systems, but may also be used in other wireless communication systems, such as code division multiple access (Code Division Multiple Access, CDMA), time division multiple access (Time Division Multiple Access, TDMA), frequency division multiple access (Frequency Division Multiple Access, FDMA), orthogonal frequency division multiple access (Orthogonal Frequency Division Multiple Access, OFDMA), single carrier frequency division multiple access (Single-carrier Frequency Division Multiple Access, SC-FDMA), and other systems. The terms "system" and "network" in embodiments of the present application are often used interchangeably, and the techniques described may be used for both the above-mentioned systems and radio technologies, as well as other systems and radio technologies. The following description describes a New air interface (NR) system for purposes of example and uses NR terminology in much of the description that follows, but these techniques are also applicable to applications other than NR system applications, such as generation 6 (6) ^th Generation, 6G) communication system.

Fig. 1 shows a block diagram of a wireless communication system to which embodiments of the present application are applicable. The wireless communication system includes a terminal 11 and a network device 12. The terminal 11 may be a mobile phone, a tablet (Tablet Personal Computer), a Laptop (Laptop Computer) or a terminal-side Device called a notebook, a personal digital assistant (Personal Digital Assistant, PDA), a palm top, a netbook, an ultra-mobile personal Computer (ultra-mobile personal Computer, UMPC), a mobile internet appliance (Mobile Internet Device, MID), an augmented reality (augmented reality, AR)/Virtual Reality (VR) Device, a robot, a Wearable Device (weather Device), a vehicle-mounted Device (VUE), a pedestrian terminal (PUE), a smart home (home Device with a wireless communication function, such as a refrigerator, a television, a washing machine, or a furniture), a game machine, a personal Computer (personal Computer, PC), a teller machine, or a self-service machine, and the Wearable Device includes: intelligent wrist-watch, intelligent bracelet, intelligent earphone, intelligent glasses, intelligent ornament (intelligent bracelet, intelligent ring, intelligent necklace, intelligent anklet, intelligent foot chain etc.), intelligent wrist strap, intelligent clothing etc.. Note that, the specific type of the terminal 11 is not limited in the embodiment of the present application. The network-side device 12 may comprise an access network device or a core network device, wherein the access network device 12 may also be referred to as a radio access network device, a radio access network (Radio Access Network, RAN), a radio access network function or a radio access network element. Access network device 12 may include a base station, a WLAN access point, a WiFi node, or the like, which may be referred to as a node B, an evolved node B (eNB), an access point, a base transceiver station (Base Transceiver Station, BTS), a radio base station, a radio transceiver, a basic service set (Basic Service Set, BSS), an extended service set (Extended Service Set, ESS), a home node B, a home evolved node B, a transmission and reception point (Transmitting Receiving Point, TRP), or some other suitable terminology in the art, and the base station is not limited to a particular technical vocabulary so long as the same technical effect is achieved, and it should be noted that in the embodiments of the present application, only a base station in an NR system is described as an example, and the specific type of the base station is not limited. The core network device may include, but is not limited to, at least one of: core network nodes, core network functions, mobility management entities (Mobility Management Entity, MME), access mobility management functions (Access and Mobility Management Function, AMF), session management functions (Session Management Function, SMF), user plane functions (User Plane Function, UPF), policy control functions (Policy Control Function, PCF), policy and charging rules function units (Policy and Charging Rules Function, PCRF), edge application service discovery functions (Edge Application Server Discovery Function, EASDF), unified data management (Unified Data Management, UDM), unified data repository (Unified Data Repository, UDR), home subscriber server (Home Subscriber Server, HSS), centralized network configuration (Centralized network configuration, CNC), network storage functions (Network Repository Function, NRF), network opening functions (Network Exposure Function, NEF), local NEF (or L-NEF), binding support functions (Binding Support Function, BSF), application functions (Application Function, AF), and the like. In the embodiment of the present application, only the core network device in the NR system is described as an example, and the specific type of the core network device is not limited.

An important way for implementing voice in a 5G network is EPS Fallback, and the main idea is to switch/redirect to 4G when IMS call is established, complete call by using 4G Long-Term Evolution voice-terminal Evolution (VoLTE), and quickly return to (fast return) 5G after IMS call is finished.

As shown in fig. 2, under the EPS Fallback mechanism, EPS Fallback can be performed in the following manner:

mode one: EPS Fallback based on switching

When a terminal with EPS Fallback capability initiates IMS Voice service demand, NR issues B1 Event measurement of LTE, after meeting B1 (Event B1) threshold, the terminal reports measurement results meeting B1 to NR, NR side initiates a switching command to LTE network based on the measurement results, and the terminal switches to LTE network to conduct Voice service (Voice).

The switching-based EPS Fallback flow mainly comprises the following steps:

gNB configures B1 event measurement for User Equipment (UE) and informs about the carrier frequency (or frequency point) of EUTRA to be measured and B1 threshold;

the ue reports the measured B1 level of the LTE cell to the gNB, including: a physical cell identifier (Physical Cell Identifier, PCI) and a measurement identity (measurement) of the measured cell;

gNB issues a handover command to UE, carrying the PCI of the target cell;

4. establishing a dedicated bearer for voice traffic with Qos class representation (QoS Class Identifier, QCI) =1;

after the 5.4G voice is finished, it is redirected to the 5G cell through fastretturn (i.e., blind redirection to the 5G cell).

Wherein, the B1 event represents: neighbor cells of different RATs become better than the threshold (i.e., B1 threshold) (Inter RAT neighbour becomes betterthan threshold).

The measurement event B1 may be used for an inter-RAT handover procedure independent of the coverage of the serving cell. For example, in the load balancing feature, the UE is decided to be moved away from the NR due to load conditions instead of radio conditions. In this case, the UE only needs to verify that the target cell in the other RAT (e.g., LTE) is better than the specific signal level threshold and is able to provide enough coverage to be able to handover to the target cell.

As shown in fig. 3, the triggering conditions of the B1 event are: mn+Ofn+Ocn-Hys > Thresh; the cancellation conditions are as follows: mn+Ofn+Ocn+Hys < Thresh.

Wherein Mn represents: the measurement results of inter-RAT neighbor cells, which do not take into account any bias;

ofn represents: specific bias of a measurement object corresponding to a frequency corresponding to the inter-RAT neighbor cell;

ocn represents: the cell specific bias of the inter-RAT neighbor cell is set to 0 if the neighbor cell is not configured with relevant parameters;

Hys represents: hysteresis parameters for the event;

thresh represents: threshold parameters for the event;

in practice, the metering mode of Mn may decide whether to use dBm or dB representation according to the measurement quantity of the inter-RAT neighbor cell; ofn, ocn and Hys are expressed in dB; thresh is metered in the same manner as Mn.

Mode two: EPS Fallback based on measurement redirection

The EPS fallback based on measurement redirection is basically similar to the EPS fallback based on switching in flow, except that the difference exists in the fallback mode; the redirection-based EPS fallback is based on the target frequency point carried in a radio resource control (Radio Resource Control, RRC) Release (Release) message falling back and forth to the LTE network after the B1 event measurement of the NR.

The flow of EPS Fallback based on measurement redirection mainly comprises the following steps:

gNB configures B1 event measurement for UE;

2, the UE reports the measurement result of the B1 event, wherein the measurement report comprises the PCI of the target cell, the measured cell level and the measured measid;

3. after the measurement result satisfying the B1 threshold is obtained, the gNB is redirected to the LTE network through an RRC Release message, where the message must include the target frequency point.

Mode three: EPS Fallback based on blind redirection

The biggest difference between EPS Fallback based on blind redirection and EPS Fallback based on measurement redirection is that the network directly redirects the UE to the LTE network, and the UE does not necessarily have a measurement result of the target frequency point.

Another way for a 5G network to implement voice is RAT Fallback.

As shown in fig. 4, the flow of RAT Fallback mainly includes the following steps:

a NG-RAN with a ue residing in a 5G system, starting a voice session establishment procedure initiated by a Mobile terminal (MO) or terminated by a Mobile terminal (Mobile Terminated, MT);

2. the network starts performing protocol data unit (Protocol Data Unit, PDU) session modification to establish a QoS flow to the source NG-RAN for IMS voice;

3. if the source NG-RAN supports the RAT fallback for IMS voice, the source NG-RAN triggers the RAT fallback according to the UE capability, network configuration and wireless conditions; the source NG-RAN may request the UE to report the measurement result of the target NG-RAN;

4. the source NG-RAN refuses the PDU session modification in step 2, indicating that the fallback is due to IMS voice in progress;

5. the source NG-RAN starts performing a handover or redirection to an evolved universal terrestrial radio access network (Evolved Universal Terrestrial Radio Access Network, E-UTRAN) connecting the 5G core network;

6. Upon completion of the handover or redirection, the network re-performs PDU session modification to establish QoS flows for IMS voice.

As known from the upper EPS/RAT Fall back flow, after receiving the QoS flow for establishing IMS voice, the gNB triggers EPS Fall back or RAT Fall back, and may require a measurement result of the terminal to the inter-RAT. Because the terminal has insufficient time for inter-RAT measurement or does not configure various reasons such as inter-RAT measurement, the measurement result of the B1 event is not satisfied before the handover/redirection is executed, so that handover failure is caused when the EPS/RAT Fallback based on handover is executed, and the EPS/RAT Fallback time delay is too long; or in the case of EPS/RAT Fallback based on redirection, since the protocol must carry the Frequency point E-UTRA Frequency of LTE when the redirection is defined, the LTE cell indicated by the serving cell (NR) through the redirection signaling is not necessarily the highest RSRP cell, and blind redirection may result in lengthy EPS/RAT Fallback delay due to improper cell selection. In this way, since the long EPS/RAT Fallback delay will reduce the voice call experience, a related design solution needs to be proposed to reduce the delay of the EPS/RAT Fallback as much as possible.

In practice, there may be several schemes available for reducing EPS/RAT Fallback delay, and when at least two schemes exist simultaneously, the terminal cannot determine which scheme to use to reduce EPS/RAT Fallback delay. In the embodiment of the application, the terminal can determine which scheme to use according to the target information to reduce the EPS/RAT Fallback delay.

The following describes in detail, with reference to the attached drawings, a voice fallback method, a device, a terminal and a readable storage medium provided by the embodiments of the present application through some embodiments and application scenarios thereof.

Referring to fig. 5, in the voice fallback method provided in the embodiment of the present application, the execution subject may be a terminal, and as shown in fig. 5, the voice fallback method may include the following steps:

step 501, the terminal determines a target scheme according to target information, wherein the target information comprises at least one of the following:

first capability information of the terminal;

In an implementation, the second network side device and the first network side device may be the same network side device, in other words, the first indication information may be indication information from the first network side device, or the second network side device and the first network side device may be different network side devices, for example: in the case where the serving cell of the terminal is changed during the movement of the terminal, the first instruction information may also be from a network side device corresponding to the serving cell of the terminal before the movement, which is not specifically limited herein.

The above M schemes can be understood as: there are M schemes available for reducing the voice fallback delay, and the terminal may take any one of the M schemes to achieve the reduction of the voice fallback delay.

In this step, the terminal determines the target scheme according to the target information, so that the terminal can select an appropriate target scheme from at least two schemes for reducing the voice fallback time delay according to the target information, so as to reduce the voice fallback time delay according to the target scheme. For example: selecting a target scheme supported by the terminal, and/or selecting a target scheme supported by the serving cell, and/or selecting a target scheme indicated by network side equipment, and/or selecting a target scheme with highest priority level, and the like.

The voice Fallback may be EPS Fallback or RAT Fallback, or other voice Fallback modes that may be used for money in the future, which is not limited herein.

Step 502, the terminal executes voice fallback according to the target scheme, wherein the target scheme is used for reducing the time delay of the voice fallback.

The terminal executing the voice fallback according to the target scheme may include: and executing a measurement scheme related to the voice fallback according to the target scheme, such as: and measuring the corresponding measurement result of the inter-RAT neighbor cell at any time and/or measuring any measurement quantity, and determining a target cell for voice fallback according to the measurement result, namely fallback to the target cell, so as to execute voice call in the target cell.

In some embodiments, the target regimen comprises any one of the following:

a first scheme for instructing the terminal to perform a first measurement related to the voice fallback in a radio resource control RRC idle state/deactivated state;

the second scheme indicates that the terminal performs cell selection or reselecting to an evolved universal mobile network system land wireless access E-UTRAN cell in an RRC idle state/deactivation state under the condition that the terminal receives a paging message carrying first information or a high-layer signaling carrying the first information in the RRC idle state/deactivation state, wherein the first information is related to the voice fallback;

In a third aspect, the terminal is instructed to receive a paging message carrying the first information or a higher layer signaling carrying the first information when the terminal is in an RRC idle state/deactivated state, and the terminal carries second instruction information in a sent RRC connection establishment request or an RRC connection restoration request, where the second instruction information is used to instruct the terminal to establish or restore RRC connection based on the first information, and the terminal receives measurement configuration information of the first network side device after establishing or restoring RRC connection, where the measurement configuration information is used to configure measurement related to voice fallback;

in a fourth aspect, when the terminal is instructed to execute the voice fallback based on redirection, if a measurement result of a neighboring cell is not obtained, frequency point information indicated by the first network side device is ignored, where the neighboring cell is an E-UTRAN cell.

Case one

For the first scheme, the first measurement related to the voice fallback is performed in an RRC idle state (idel)/inactive state (inactive), where the first measurement may be referred to as measurement in the RRC idle state/inactive state, the terminal reports a measurement result of the first measurement after entering a connection state, and the network side device determines the target cell of the voice fallback according to the measurement result of the first measurement.

In this way, the terminal does not need to wait for entering the RRC connection state and then execute other connection state measurement related to the voice fallback, thereby reducing the time delay of entering the RRC connection state from the RRC idle state/the deactivation state in the voice fallback process.

Optionally, the first scheme may specifically include the following sub-schemes:

a first sub-scheme indicating that the terminal is in an RRC idle state/deactivated state, performing a first measurement related to the voice fallback; or alternatively, the process may be performed,

a second sub-scheme, indicating the terminal to start to execute the first measurement related to the voice fallback when receiving the paging message carrying the first information or the higher layer signaling carrying the first information in the RRC idle state/deactivation state; or alternatively, the process may be performed,

and a third sub-scheme, wherein the third sub-scheme indicates that when the terminal receives a paging message carrying the first information or a higher layer signaling carrying the first information in an RRC idle state/deactivation state, the terminal starts to execute first measurement related to the voice fallback, and when the terminal does not complete the first measurement in the RRC idle state/deactivation state, the terminal continues to execute the first measurement after establishing or recovering RRC connection according to received measurement configuration information prepared in advance by the first network side device in a first time period, wherein the measurement configuration information is used for configuring the measurement related to the voice fallback, and the terminal is in the RRC idle state/deactivation state in the first time period.

For the first sub-scheme, the terminal may directly perform the first measurement without receiving a paging message carrying the first information or a higher layer signaling carrying the first information.

The second sub-scheme is different from the first sub-scheme in that: the second sub-scheme needs to trigger the first measurement based on the acquired first information when receiving a paging message carrying the first information or a higher layer signaling carrying the first information.

In some embodiments, the first information may be understood as: information sent by the network side device and used for indicating the terminal to perform voice fallback, for example: the first information may include at least one of:

indication information of voice call, wherein the voice call comprises an internet protocol multimedia subsystem IMS voice call;

and the indication information of the voice fallback (for example, the indication information of EPS fallback, RAT fallback or fallback).

Thus, the terminal can determine that voice fallback is required based on the first information, and the terminal is triggered to execute the first measurement.

Of course, the first information can also be understood as: the indication information sent by the network side device and used for indicating the terminal to execute the first measurement, or configuration information configured by the network side device and related to the first measurement, etc. so that the terminal executes the first measurement based on the first information, which is not specifically limited herein.

In some embodiments, the first information may be carried in a paging message, so that the network side device may actively send the paging message carrying the first information to trigger the terminal to perform the first measurement.

In other embodiments, the first information may be carried in a higher layer signaling of the terminal, so that a higher layer of the terminal may actively trigger the terminal to perform the first measurement.

The third sub-scheme differs from the second sub-scheme in that: under the condition that the terminal does not complete the first measurement in the RRC idle state/deactivated state, the terminal can continue to execute the first measurement after establishing or recovering the RRC connection, so that the problem that the terminal needs to restart measurement after establishing or recovering the RRC connection under the condition that the terminal does not complete the first measurement in the RRC idle state/deactivated state, and the consumed time and measurement resources in part of the measurement process executed by the terminal in the RRC idle state/deactivated state are wasted is avoided, the time for executing the first measurement process can be reduced, and the effect of reducing the total voice fallback time is realized.

In addition, in the third sub-scheme, the first network side device prepares the measurement configuration information in advance when the terminal is in the RRC idle state/deactivated state.

In an implementation, the first network side device may prepare the measurement configuration information in advance when the terminal is in an RRC idle state/deactivated state based on the first information carried in the sent paging message (paging), or detecting that the paging cause is that the terminal performs a voice call or needs to perform a voice back-off (e.g., the terminal indicates the voice call service in the establishment cause during the process of establishing an RRC connection with the first network side device).

In this way, after the terminal establishes or resumes the RRC connection, the first network side device may directly send the measurement configuration information to the terminal, so that the first network side does not need to start to prepare the measurement configuration information after the terminal establishes or resumes the RRC connection, and thus a time delay of configuring the measurement configuration information to the terminal may be reduced, thereby reducing a time delay of the terminal performing the first measurement.

Case two

For the second scheme, the terminal can perform cell selection or reselect to the evolved universal mobile network system terrestrial radio access E-UTRAN cell in advance in an idle state/a deactivated state.

In some embodiments, in the process of performing cell selection or reselecting to the E-UTRAN cell in advance, the terminal may measure a frequency point indicated by the network side device in an idle state/a deactivated state to obtain a measurement result, and select to access to a target cell or reselect to the target cell according to the measurement result.

For example: reselecting to a target cell according to the measurement result and at least one of the following reselection rules:

E-UTRAN cell selection receiving level value is higher than the receiving level reselection threshold of the cell;

E-UTRAN district chooses the receiving quality value to be higher than the receiving quality of district and reselects the threshold;

the E-UTRAN cell with high priority selects the receiving level value to be higher than the receiving level reselection threshold of the cell with high priority;

the E-UTRAN cell with high priority selects the receiving quality value to be higher than the receiving quality reselection threshold of the cell with high priority;

the receiving level value selected by the service cell is lower than the receiving level reselection threshold of the service cell, and the receiving level value selected by the E-UTRAN with low priority is higher than the receiving level reselection threshold of the cell with low priority;

the serving cell selection reception quality value is below a reception level reselection threshold for the serving cell and the low priority E-UTRAN cell selection reception quality value is above a reception quality reselection threshold for the low priority cell.

Through the second scheme, when the terminal in the idle state or the inactive state receives the first paging or requests the first service or carries the high-layer signaling of the first information, the terminal immediately performs the cell selection or reselection operation. Thus, the time delay caused by the need of firstly establishing or recovering the RRC connection when the terminal executes the voice service in the idle state or the inactive state can be avoided. Therefore, the embodiment of the application can reduce the voice fallback time delay.

Case three

For the third aspect, in some embodiments, when the terminal receives the paging message carrying the first information or the higher layer signaling carrying the first information in the RRC idle state/deactivated state, the terminal carries the second indication information in the sent RRC connection establishment request or RRC connection recovery request, so that the terminal in the RRC idle state/deactivated state may carry the second indication information in the RRC connection establishment request or the RRC connection recovery request sent to the first network side device, so as to inform the first network side device that the reason that the terminal establishes or recovers the RRC connection is that the terminal needs to perform voice fallback or perform voice call. In this way, the first network side device can start to prepare the measurement configuration information based on the second indication information, so that after the terminal establishes or resumes the RRC connection, the measurement configuration information can be sent to the terminal as early as possible, so as to reduce configuration delay.

Of course, the reason why the first network side device may also learn that the terminal in the RRC idle state/deactivated state establishes or resumes the RRC connection through other manners is that the terminal needs to perform voice fallback or perform voice call, which is not limited herein specifically.

Case four

For the fourth solution, when the terminal performs the redirection-based fallback of the voice (e.g., based on the redirect EPS fallback), if the measurement result of the neighboring cell is not obtained, the terminal is likely to not find a suitable E-UTRAN cell even if the terminal measures the frequency point information indicated by the first network side device, and at this time, the terminal ignores the frequency point information indicated by the first network side device, which can reduce resource waste caused by the terminal measuring the frequency point information indicated by the first network side device and shorten measurement delay.

The measurement result of the neighbor cell not acquired can be understood as: the measurement result satisfying the trigger condition of the B1 event is not acquired.

In implementation, the terminal only reports to the first network side device when obtaining the measurement result satisfying the triggering condition of the B1 event, and correspondingly, when the terminal does not obtain the measurement result satisfying the triggering condition of the B1 event, the first network side device does not know which neighboring cells of the frequency points are suitable for the terminal, so that the first network side device can redirect the LTE cell indicated by the signaling (i.e., the LTE cell corresponding to the frequency point information) and is not the cell with the highest reference signal received power (Reference Signal Received Power, RSRP), and blind redirection may cause too long EPS/RAT Fallback delay because of unsuitable cell selection.

Through the fourth scheme, when the terminal performs the voice Fallback based on redirection, if the terminal does not acquire the measurement result meeting the triggering condition of the B1 event, the LTE cell indicated by the first network side device is ignored, so as to reduce EPS/RAT Fallback delay caused by blind redirection possibly due to improper cell selection.

It should be noted that, in practical application, if the terminal does not acquire the measurement result satisfying the triggering condition of the B1 event, whether to ignore the frequency point information indicated by the first network side device may be configured by the network side device, for example: the terminal receives target indication information from network side equipment, wherein the target indication information is used for indicating the terminal to ignore frequency point information indicated by the first network side equipment when the terminal does not acquire a measurement result meeting the triggering condition of a B1 event, and therefore, when the terminal receives the target indication information, the terminal executes the step of ignoring the frequency point information indicated by the first network side equipment when the terminal does not acquire the measurement result meeting the triggering condition of the B1 event; correspondingly, if the terminal does not receive the target indication information, the terminal may perform measurement based on the frequency point information indicated by the first network side device without specific limitation if a measurement result satisfying the triggering condition of the B1 event is not obtained.

As an optional implementation manner, in a case that the target information includes the first capability information, the determining, by the terminal, a target scheme according to the target information includes:

and the terminal determines a target scheme supported by the terminal according to the first capability information.

In this embodiment, the terminal selects the supported target scheme according to its own capability information, so as to avoid the problem that the terminal fails to fall back due to the speech falling back according to the scheme that the terminal does not support.

As an optional implementation manner, in a case that the target information includes the second capability information, the determining, by the terminal, a target scheme according to the target information includes:

and the terminal determines a target scheme supported by the first network side equipment according to the second capability information.

In this embodiment, the terminal selects a target scheme supported by the network according to the capability information of the first network side device, so as to avoid the problem that the terminal performs voice fallback according to a scheme not supported by the first network side device and causes voice fallback failure.

As an optional implementation manner, the second capability information includes second information from the first network side device, where the second information is used to indicate the target solution supported by the first network side device.

In this embodiment, the first network side device determines which one or more schemes for reducing the voice fallback delay are supported according to the capability information of the first network side device, and informs the terminal of the determined supported schemes through second information, so that the terminal receives the second information from the first network side device, and can determine which one or more schemes for reducing the voice fallback delay are supported by the first network side device according to the second information, without acquiring the second capability information of the first network side device, and further performing capability judgment according to the second capability information, so that transmission resources and computing resources of the terminal can be reduced.

In some embodiments, the second information may explicitly indicate the target scheme supported by the first network side device, for example: the second information is used to characterize the first measurement (i.e. the measurement of RRC idle/inactive) that the first network device supports to reduce EPS/RAT Fallback latency.

In other embodiments, the second information may include identification information corresponding to the target solution, for example: assuming that the first network device supports only scheme a and scheme B, at this time, the 2-bit second information may be used to indicate the identity of the scheme supported by the first network device, i.e., "10" represents supporting only scheme a and "01" represents supporting only scheme B; "11" represents support for scheme a and scheme B.

Of course, in other embodiments, the second information may also suggest a scheme supported by the first network side device, for example: the second information includes indication information of the target scheme, or the second information includes configuration information related to configuring the terminal to execute the target scheme.

For example: the second information is configuration information of RRC idle/inactive measurement, and the configuration information is used for configuring relevant information for reducing measurement of EPS/RAT Fallback delay.

In this way, when the terminal receives the second information, the scheme that the first network side device supports the second information indication is indicated; correspondingly, when the terminal does not receive the second information, the scheme that the first network side equipment does not support the second information indication is indicated.

Of course, in practical applications, the terminal and the first network side device may also determine a scheme supported by the first network side device in other manners, for example: default schemes supported by the first network side device are predefined by a protocol or default by default, which schemes are not specifically described herein.

It should be noted that, in the case where the second information is used to indicate that the first network side device supports the target solution, or is used to configure the target solution, the role of the second information may be the same as that of the first indication information, and in implementation, the terminal may only acquire any one of the second information and the first indication information, so as to determine the target solution according to the second information and the first indication information; of course, the terminal may also acquire the second information and the first indication information, for example: the second information is used for indicating that the first network side device supports two schemes, and the first indication information is used for indicating one of the two schemes, so that the terminal can determine that the target scheme is one scheme supported by the first network side device and indicated in the first indication information according to the second information and the first indication information.

As an optional implementation manner, the priority information of the M schemes is predefined by a protocol, or the priority information of the M schemes is carried in the configuration information of the target scheme, or the priority information of the M schemes is carried in an indication message received by the terminal from a third network side device.

In an implementation, if the target information includes priority information of the M schemes, the terminal preferentially selects a scheme with a high priority as a target scheme.

In a first alternative embodiment, the priority information of the M schemes is carried in the configuration information of the target scheme, which can be understood as: when the network side equipment sends configuration information related to each scheme, the configuration information contains priority indication information, so that multiplexing of the configuration information to transmit the priority information is realized, and compared with the mode that the network side equipment sends additional indication information to indicate the priority information of M schemes, the signaling overhead of the terminal can be reduced.

In a second alternative embodiment, similar to the manner that the priority information of the M schemes is carried in the configuration information of the target scheme, the signaling overhead of the terminal can be reduced in a manner that the terminal acquires the priority information of the M schemes through a protocol predefined manner.

In a third optional implementation manner, the priority information of the M schemes is carried in an indication message received by the terminal from a third network side device, and the priority information of the M schemes may be flexibly indicated or changed through the indication message, where the third network side device may be any network side device, for example: the network-side device corresponding to the serving cell before the movement or the first network-side device corresponding to the current serving cell, etc., are not particularly limited herein.

As an optional implementation manner, the terminal may preferentially perform voice fallback according to the target scheme indicated by the first network side device.

In this embodiment, the terminal receives first indication information from the first network side device, so as to determine, according to the indication of the first indication information, which scheme to apply to reduce the EPS/RAT Fallback delay. For example: when the first network side device indicates that the schemes 1 and 3 are supported, the first network side device may send first indication information to the terminal, where if the first indication information is "0", the terminal is indicated to apply the scheme 1; and if the first indication information is 1, indicating the terminal application scheme 3. Or the terminal selects the scheme 1 when the first indication information appears, and judges which scheme is applied according to other information when the first indication information does not appear.

Wherein, the first indication information may be carried in at least one of the following:

system information block (System Information Block, SIB) message, RRC Release (Release) message, configuration message related to the target scheme.

Wherein the configuration message related to the target solution may be used in any process of configuring the target solution, for example: the configuration message is not meant to be exhaustive herein, and is a measurement configuration message for configuring an advanced measurement (i.e. the first measurement) or measurement configuration information prepared in advance by the network side, etc.

It should be noted that the above embodiments for determining the target solution may be combined, i.e. the terminal may determine the target solution according to at least two items of the target information. For example: the voice fallback is executed according to a scheme supported by the terminal and the first network side device together, or the voice fallback is executed according to one with the highest priority level in the scheme supported by the terminal and the first network side device together, or the voice fallback is executed according to a scheme supported by the terminal and the first network side device together in the scheme indicated by the first network side device, which is not exhaustive here.

As an optional implementation manner, the determining, by the terminal, the target solution according to the target information includes:

the terminal acquires a fifth scheme supported by the first network side equipment;

if the number of the fifth schemes is one, the terminal determines that the target scheme is the fifth scheme if the terminal supports the fifth scheme; or alternatively, the process may be performed,

in the case that the number of the fifth schemes is at least two, if the terminal supports one of the fifth schemes, the terminal determines that the target scheme is the fifth scheme supported by the terminal; or alternatively, the process may be performed,

and if the number of the fifth schemes is at least two, if the terminal supports at least two of the fifth schemes, the terminal determines the target scheme from the fifth schemes supported by the terminal according to other information except the first capability information and the second capability information in the target information.

In implementation, the fifth solution may include at least one of the first solution, the second solution, the third solution and the fourth solution listed in the foregoing embodiment, and the first solution may be further divided into a first sub-solution, a second sub-solution and a third sub-solution, which are not described herein.

Case one

If the first network side equipment only supports one scheme in the M schemes, the terminal judges whether the scheme supported by the first network side equipment can be applied according to the self-capability.

For example: if the terminal has the capability to support the scheme, the terminal applies the scheme; if the terminal does not have the capability to support the scheme, the terminal cannot apply the EPS/RAR Fallback scheme.

Case two

And if the first network side equipment supports at least two schemes in the M schemes, and the terminal judges one scheme which can support the first network side equipment according to the self-capability, applying the scheme which is commonly supported by the terminal and the first network side equipment.

Case three

If the first network side device supports at least two schemes among the M schemes and the terminal can also support at least two schemes supported by the first network side device, the terminal can further determine which method for reducing EPS/RAT Fallback delay is applied according to other determination methods.

For example: determining one of schemes supported by the terminal and the first network side equipment together as a target scheme according to the first indication information; according to the priority order of the M schemes, determining one with the highest priority from schemes commonly supported by the terminal and the first network side equipment as a target scheme; or when the first indication information indicates at least two schemes commonly supported by the terminal and the first network side device, further determining, according to the priority order of the M schemes, one with the highest priority from the schemes commonly supported by the terminal and the first network side device and indicated by the first indication information as a target scheme.

According to the voice fallback method provided by the embodiment of the application, the execution main body can be a voice fallback device. In this embodiment of the present application, a voice fallback method performed by a voice fallback device is taken as an example, and the voice fallback device provided in this embodiment of the present application is described.

Referring to fig. 6, the voice fallback device provided in the embodiment of the present application may be applied to a terminal, and as shown in fig. 6, the voice fallback device 600 may include the following modules:

a determining module 601, configured to determine a target solution according to the target information;

an execution module 602, configured to execute a voice fallback according to the target scheme;

first capability information of the terminal;

Optionally, the voice Fallback includes an evolved packet system EPS Fallback or a radio access technology RAT Fallback.

Optionally, the target scheme includes any one of the following:

in a third aspect, the terminal is instructed to carry second instruction information in a sent RRC connection establishment request or an RRC connection restoration request when the terminal is in an RRC idle state/deactivated state, and the terminal receives measurement configuration information of the first network side device after establishing or restoring RRC connection, where the measurement configuration information is used to configure measurement related to the voice fallback;

Optionally, the first scheme includes:

a second sub-scheme, indicating the terminal to start to execute the first measurement related to the voice fallback when receiving a paging message carrying the first information or a higher layer signaling carrying the first information in an RRC idle state/deactivation state; or alternatively, the process may be performed,

and a third sub-scheme, wherein the third sub-scheme indicates that when the terminal receives paging information carrying the first information or high-layer signaling carrying the first information in an RRC idle state/deactivation state, the terminal starts to execute first measurement related to the voice fallback, and when the terminal does not complete the first measurement in the RRC idle state/deactivation state, the terminal continues to execute the first measurement after establishing or recovering RRC connection according to received measurement configuration information prepared in advance by the first network side device in a first time period, wherein the measurement configuration information is used for configuring measurement related to the voice fallback, and the terminal is in the RRC idle state/deactivation state in the first time period.

Optionally, the first information includes at least one of:

and the voice falling indication information.

Optionally, in the case that the target information includes the first capability information, the determining module 601 is specifically configured to:

and determining a target scheme supported by the terminal according to the first capability information.

Optionally, in the case that the target information includes the second capability information, the determining module 601 is specifically configured to:

and determining a target scheme supported by the first network side equipment according to the second capability information.

Optionally, the second capability information includes second information from the first network side device, where the second information is used to indicate the target solution supported by the first network side device.

Optionally, the second information includes indication information of the target scheme, or the second information includes configuration information related to configuring the terminal to execute the target scheme.

Optionally, the priority information of the M schemes is predefined by a protocol, or the priority information of the M schemes is carried in configuration information of the target scheme, or the priority information of the M schemes is carried in an indication message received by the terminal from a third network side device.

Optionally, the determining module 601 includes:

an obtaining unit, configured to obtain a fifth scheme supported by the first network side device;

a first determining unit, configured to determine, if the terminal supports the fifth scheme, that the target scheme is the fifth scheme if the number of the fifth schemes is one; or alternatively, the process may be performed,

a second determining unit configured to determine, if the terminal supports one of the fifth schemes, that the target scheme is the fifth scheme supported by the terminal, in a case where the number of the fifth schemes is at least two; or alternatively, the process may be performed,

a third determining unit, configured to determine, if the terminal supports at least two of the fifth schemes, the target scheme from the fifth schemes supported by the terminal according to other information than the first capability information and the second capability information in the target information, where the number of the fifth schemes is at least two.

Optionally, the first indication information is carried in at least one of the following:

system information block SIB message, RRC Release message, configuration message related to the target scheme.

The voice fallback apparatus 600 in the embodiment of the present application may be an electronic device, for example, an electronic device with an operating system, or may be a component in an electronic device, for example, an integrated circuit or a chip. The electronic device may be a terminal, or may be other devices than a terminal. By way of example, terminals may include, but are not limited to, the types of terminals 11 listed above, other devices may be servers, network attached storage (Network Attached Storage, NAS), etc., and embodiments of the application are not specifically limited.

The voice fallback device 600 provided in this embodiment of the present application can implement each process implemented by the method embodiment described in fig. 5, and achieve the same technical effects, so that repetition is avoided, and no further description is provided herein.

Optionally, as shown in fig. 7, the embodiment of the present application further provides a communication device 700, including a processor 701 and a memory 702, where the memory 702 stores a program or an instruction that can be executed on the processor 701, for example, when the communication device 700 is a terminal, the program or the instruction is executed by the processor 701 to implement each step of the foregoing embodiment of the voice fallback method, and the same technical effects can be achieved, so that repetition is avoided, and no further description is given here.

The embodiment of the application also provides a terminal, which comprises a processor and a communication interface, wherein the processor is used for determining a target scheme according to target information, and the communication interface is used for executing voice fallback according to the target scheme;

first capability information of the terminal;

The terminal embodiment corresponds to the terminal-side method embodiment, and each implementation process and implementation manner of the method embodiment can be applied to the terminal embodiment, and the same technical effects can be achieved. Specifically, fig. 8 is a schematic hardware structure of a terminal for implementing an embodiment of the present application.

The terminal 800 includes, but is not limited to: at least part of the components of the radio frequency unit 801, the network module 802, the audio output unit 803, the input unit 804, the sensor 805, the display unit 806, the user input unit 807, the interface unit 808, the memory 809, and the processor 810, etc.

Those skilled in the art will appreciate that the terminal 800 may further include a power source (e.g., a battery) for powering the various components, and that the power source may be logically coupled to the processor 810 by a power management system for performing functions such as managing charging, discharging, and power consumption by the power management system. The terminal structure shown in fig. 8 does not constitute a limitation of the terminal, and the terminal may include more or less components than shown, or may combine certain components, or may be arranged in different components, which will not be described in detail herein.

It should be appreciated that in embodiments of the present application, the input unit 804 may include a graphics processing unit (Graphics Processing Unit, GPU) 8041 and a microphone 8042, with the graphics processor 8041 processing image data of still pictures or video obtained by an image capturing device (e.g., a camera) in a video capturing mode or an image capturing mode. The display unit 806 may include a display panel 8061, and the display panel 8061 may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 807 includes at least one of a touch panel 8071 and other input devices 8072. Touch panel 8071, also referred to as a touch screen. The touch panel 8071 may include two parts, a touch detection device and a touch controller. Other input devices 8072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and so forth, which are not described in detail herein.

In this embodiment, after receiving downlink data from the network side device, the radio frequency unit 801 may transmit the downlink data to the processor 810 for processing; in addition, the radio frequency unit 801 may send uplink data to the network side device. In general, the radio frequency unit 801 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like.

The memory 809 may be used to store software programs or instructions and various data. The memory 809 may mainly include a first storage area storing programs or instructions and a second storage area storing data, wherein the first storage area may store an operating system, application programs or instructions (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like. Further, the memory 809 may include volatile memory or nonvolatile memory, or the memory 809 may include both volatile and nonvolatile memory. The nonvolatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable EPROM (EEPROM), or a flash Memory. The volatile memory may be random access memory (Random Access Memory, RAM), static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (ddr SDRAM), enhanced SDRAM (Enhanced SDRAM), synchronous DRAM (SLDRAM), and Direct RAM (DRRAM). Memory 809 in embodiments of the present application includes, but is not limited to, these and any other suitable types of memory.

The processor 810 may include one or more processing units; optionally, the processor 810 integrates an application processor that primarily processes operations involving an operating system, user interface, application programs, etc., and a modem processor that primarily processes wireless communication signals, such as a baseband processor. It will be appreciated that the modem processor described above may not be integrated into the processor 810.

Wherein the processor 810 is configured to determine a target solution according to the target information;

a radio frequency unit 801, configured to perform voice fallback according to the target scheme;

first capability information of the terminal;

Optionally, the target scheme includes any one of the following:

in a third aspect, if the terminal receives a paging message carrying the first information or a higher layer signaling carrying the first information when the terminal is in an RRC idle state/deactivated state, the terminal carries second indication information in a sent RRC connection establishment request or an RRC connection restoration request, where the second indication information is used to instruct the terminal to establish or restore RRC connection based on the first information, and the terminal receives measurement configuration information of the first network side device after establishing or restoring RRC connection, where the measurement configuration information is used to configure measurement related to voice fallback;

Optionally, the first scheme includes:

Optionally, the first information includes at least one of:

and the voice falling indication information.

Optionally, in the case that the target information includes the first capability information, the determining, by the processor 810, a target scheme according to the target information includes:

Optionally, in the case that the target information includes the second capability information, the determining, by the processor 810, a target scheme according to the target information includes:

Optionally, the determining, by the processor 810, the target solution according to the target information includes:

acquiring a fifth scheme supported by the first network side device through a radio frequency unit 801;

in case that the number of the fifth scheme is one, if the terminal supports the fifth scheme, the processor 810 determines that the target scheme is the fifth scheme; or alternatively, the process may be performed,

in case that the number of the fifth schemes is at least two, if the terminal supports one of the fifth schemes, the processor 810 determines that the target scheme is the fifth scheme supported by the terminal; or alternatively, the process may be performed,

in case that the number of the fifth schemes is at least two, if the terminal supports at least two of the fifth schemes, the processor 810 determines the target scheme from the fifth schemes supported by the terminal according to other information than the first capability information and the second capability information in the target information.

The terminal 800 provided in this embodiment of the present application can implement each process implemented by the voice fallback device 600 shown in fig. 6, and can obtain the same beneficial effects, so that repetition is avoided, and detailed description is omitted here.

The embodiment of the present application further provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, and when the program or the instruction is executed by a processor, the processes of the foregoing embodiments of the voice fallback method are implemented, and the same technical effects can be achieved, so that repetition is avoided, and no further description is given here.

Wherein the processor is a processor in the terminal described in the above embodiment. The readable storage medium includes computer readable storage medium such as computer readable memory ROM, random access memory RAM, magnetic or optical disk, etc.

The embodiment of the application further provides a chip, the chip includes a processor and a communication interface, the communication interface is coupled with the processor, the processor is used for running a program or an instruction, implementing each process of the above embodiment of the voice fallback method, and achieving the same technical effect, so as to avoid repetition, and no redundant description is provided herein.

It should be understood that the chips referred to in the embodiments of the present application may also be referred to as system-on-chip chips, or the like.

The embodiments of the present application further provide a computer program/program product, where the computer program/program product is stored in a storage medium, and the computer program/program product is executed by at least one processor to implement each process of the foregoing embodiments of the voice fallback method, and achieve the same technical effects, so that repetition is avoided, and details are not repeated herein.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of the present application is not limited to performing the functions in the order shown or discussed, but may also include performing the functions in a substantially simultaneous manner or in an opposite order depending on the functions involved, e.g., the described methods may be performed in an order different from that described, and various steps may also be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solutions of the present application may be embodied essentially or in a part contributing to the prior art in the form of a computer software product stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk), comprising several instructions for causing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method described in the embodiments of the present application.

The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those of ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are also within the protection of the present application.

Claims

1. A method of speech fallback comprising:

the terminal determines a target scheme according to the target information;

the terminal executes voice fallback according to the target scheme;

first capability information of the terminal;

2. The method of claim 1, wherein the voice Fallback comprises an evolved packet system EPS Fallback or a radio access technology RAT Fallback.

3. The method according to claim 1 or 2, wherein the target scheme comprises any one of the following:

The second scheme indicates that the terminal performs cell selection or reselects to an evolved universal mobile network system land wireless access E-UTRAN cell in the RRC idle state/deactivation state under the condition that the terminal receives paging information carrying first information or high-layer signaling carrying first information in the RRC idle state/deactivation state, wherein the first information is related to the voice fallback;

4. A method according to claim 3, wherein the first scheme comprises:

5. The method of claim 3 or 4, wherein the first information comprises at least one of:

and the voice falling indication information.

6. The method according to any one of claims 1 to 5, wherein, in case the target information comprises the first capability information, the terminal determines a target scheme according to target information, comprising:

7. The method according to any one of claims 1 to 5, wherein in case the target information comprises the second capability information, the terminal determines a target scheme according to the target information, comprising:

8. The method according to any one of claims 1 to 5, wherein the priority information of the M schemes is predefined by a protocol, or the priority information of the M schemes is carried in configuration information of the target scheme, or the priority information of the M schemes is carried in an indication message received by the terminal from a third network side device.

9. The method according to any one of claims 1 to 8, wherein the terminal determines a target scheme according to target information, comprising:

10. The method according to any one of claims 1 to 9, wherein the first indication information is carried in at least one of:

11. A voice fallback apparatus, characterized in that it is applied to a terminal, said apparatus comprising:

first capability information of the terminal;

12. The apparatus of claim 11, wherein the voice Fallback comprises an evolved packet system EPS Fallback or a radio access technology RAT Fallback.

13. The apparatus of claim 11 or 12, wherein the target scheme comprises any one of:

14. The apparatus of claim 13, wherein the first scheme comprises:

15. The apparatus of claim 13 or 14, wherein the first information comprises at least one of:

and the voice falling indication information.

16. The apparatus according to any one of claims 11 to 15, wherein in case the target information comprises the first capability information, the determining module is specifically configured to:

17. The apparatus according to any one of claims 11 to 15, wherein in case the target information comprises the second capability information, the determining module is specifically configured to:

18. The apparatus according to any one of claims 11 to 15, wherein the priority information of the M schemes is predefined by a protocol, or the priority information of the M schemes is carried in configuration information of the target scheme, or the priority information of the M schemes is carried in an indication message received by the terminal from a third network side device.

19. The apparatus according to any one of claims 11 to 18, wherein the determining module comprises:

20. The apparatus according to any one of claims 11 to 19, wherein the first indication information is carried in at least one of:

21. A terminal comprising a processor and a memory storing a program or instructions executable on the processor, which when executed by the processor, implement the steps of the speech fallback method according to any of claims 1 to 10.

22. A readable storage medium, characterized in that the readable storage medium has stored thereon a program or instructions which, when executed by a processor, implement the steps of the speech fallback method according to any of the claims 1 to 10.