CN109769262B

CN109769262B - VoLTE call recovery method and terminal equipment

Info

Publication number: CN109769262B
Application number: CN201910229678.XA
Authority: CN
Inventors: 谢宁宁; 洪岳; 孙彦良
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2019-03-25
Filing date: 2019-03-25
Publication date: 2022-12-27
Anticipated expiration: 2039-03-25
Also published as: CN109769262A

Abstract

The embodiment of the invention discloses a VoLTE call recovery method and terminal equipment, wherein the method comprises the following steps: if a Radio Link Failure (RLF) occurs in the VoLTE call process, acquiring a first target cell, wherein the RSRP of the first target cell is greater than or equal to a target threshold value and less than or equal to a minimum threshold value Qrxlevmin of a terminal device for receiving cell signals; resetting the RSRP of the first target cell based on the Qrxlevmin, the RSRP after the first target cell reset being greater than the Qrxlevmin. The method of the embodiment of the invention can avoid the problem of call drop caused by the fact that the RSRP of the cell is lower than the Qrxlevmin configured by the network equipment.

Description

VoLTE call recovery method and terminal equipment

Technical Field

The application relates to the technical field of communication, in particular to a VoLTE call recovery method and terminal equipment.

Background

In a Voice over Long-Term Evolution (VoLTE) call, after Radio Link Failure (RLF) occurs due to various reasons, a terminal device may start a cell reestablishment procedure: 1) Starting a T311 timer, carrying out cell synchronization to reside, if a suitable cell can be found for carrying out synchronization and residence, closing the T311 timer and starting a T301 timer, and initiating a reconstruction request by the terminal equipment; 2) And if the timer T311 or the timer T301 is overtime, the terminal equipment enters an idle state, searches for the network again, and seeks a proper cell for synchronization to reside. If a suitable cell is not found for more than a certain time, the call is dropped because a Real-time Transport Protocol (RTP) packet is timed out.

In the cell reestablishing process, the cell found by the terminal device needs to satisfy the S criterion to be able to successfully camp, that is, the Reference Signal Receiving Power (RSRP) of the terminal device in the cell needs to be greater than the minimum threshold (Qrxlevmin) of the terminal device configured by the network to receive the cell Signal. However, at present, the configuration of Qrxlevmin is not a fixed value, but the receiving capability of the terminal device is basically fixed, so that at some fast fading cell edges, even if the RSRP of the cell can meet the requirement of the terminal device for downlink normal reception or uplink random access, a problem of a VoLTE call drop due to the RSRP of the cell being lower than that of Qrxlevmin may occur, which affects user experience.

Disclosure of Invention

The embodiment of the invention aims to provide a VoLTE call recovery method, so as to solve the problem that a call drop is caused because the RSRP of a cell is lower than a minimum threshold value of a network device for receiving cell signals under the condition that the RSRP of the cell can meet the downlink normal receiving or uplink random access requirements of a terminal device.

In order to solve the above technical problem, the embodiment of the present invention is implemented as follows:

in a first aspect, a VoLTE call recovery method is provided, where the method includes:

if Radio Link Failure (RLF) occurs in the VoLTE call process, acquiring a first target cell, wherein the RSRP of the first target cell is greater than or equal to a target threshold value and less than or equal to a minimum threshold value Qrxlevmin of a terminal device for receiving cell signals;

resetting the RSRP of the first target cell based on the Qrxlevmin, the RSRP after the first target cell is reset being greater than the Qrxlevmin.

In a second aspect, a terminal device is provided, where the terminal device includes:

an obtaining module, configured to obtain a first target cell if a radio link failure TLF occurs during a VoLTE call, where an RSRP of the first target cell is greater than or equal to a target threshold and less than or equal to a minimum threshold Qrxlevmin at which a terminal device receives a cell signal;

and the processing module is used for resetting the RSRP of the first target cell based on the Qrxlevmin, wherein the RSRP after the first target cell is reset is larger than the Qrxlevmin.

In a third aspect, a terminal device is provided, which includes: memory, a processor and a computer program stored on the memory and executable on the processor, which computer program, when executed by the processor, performs the steps of the method of VoLTE call recovery as described in the first aspect.

In a fourth aspect, a computer readable medium is provided, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the method for VoLTE call recovery as described in the first aspect.

In the embodiment of the invention, when the terminal equipment generates RLF in the VoLTE call process, the RSRP of the cell of which the RSRP is greater than or equal to the target threshold value and is less than or equal to the minimum threshold value Qrxlevmin of the cell signal received by the terminal equipment is reset to be higher than the value of Qrxlevmin, so that the problem of call drop caused by the fact that the RSRP of the cell is lower than the value of Qrxlevmin configured by the network equipment can be avoided.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic flow diagram of a method of VoLTE call recovery according to one embodiment of the present invention.

Fig. 2 is a schematic flow chart of a VoLTE call recovery method according to one embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a terminal device according to an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a terminal device according to another 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 some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The technical scheme of the invention can be applied to various communication systems, such as: a Long Term Evolution (LTE)/enhanced Long Term Evolution (LTE-a) system, a New Radio (NR) system, and the like.

A User Equipment (UE) in the embodiments of the present invention, which may also be referred to as a Mobile Terminal (Mobile Terminal), a Mobile User Equipment, and the like, may communicate with one or more core networks through a Radio Access Network (RAN, for example), where the User Equipment may be a Mobile Terminal, such as a Mobile phone (or referred to as a "cellular" phone) and a computer having the Mobile Terminal, such as a portable, pocket, handheld, computer-embedded, or vehicle-mounted Mobile device, and they exchange languages and/or data with the Radio Access Network.

The network device in the embodiment of the present invention is a device deployed in a radio access network device and configured to provide a radio communication function for a terminal device, where the network device may be a base station, and the base station may be an evolved Node B (eNB) or an e-NodeB in LTE, a 5G base station (gNB), or a network end device in a subsequent evolution version, which is not limited in this respect.

The technical solutions provided by the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

Fig. 1 illustrates a method for recovering a call by a voice over long term evolution (VoLTE) according to an embodiment of the present application. As shown in fig. 1, the method comprises:

s110, if radio link failure RLF occurs in the VoLTE call process, a first target cell is obtained, and the RSRP of the first target cell is larger than or equal to a target threshold value and smaller than or equal to a minimum threshold value Qrxlevmin of a terminal device for receiving cell signals.

In S110, the minimum threshold value Qrxlevmin of the terminal device receiving the cell signal is configured by the network device through signaling. The RSRP of the first target cell is RSRP measured by the terminal device, and may also be referred to as "RSRP of the terminal device".

Optionally, in some embodiments, the target threshold is related to a capability of the terminal device, and the capability of the terminal device includes at least one of a downlink receiving capability and an uplink random access capability.

Or, it can be understood that the target threshold is a threshold determined by the terminal device according to a lower limit of RSRP corresponding to the downlink receiving capability of the terminal device and/or a lower limit of RSRP corresponding to the uplink random access capability of the terminal device.

Optionally, in some embodiments, the acquiring the first target cell in S110 includes: carrying out frequency point scanning and recording cells searched in the frequency point scanning process; and acquiring a first target cell from the searched cells.

As an example, acquiring the first target cell from the searched cells includes: and acquiring a first target cell from the searched cells based on the sequence of the RSRP from big to small.

That is to say, when the first target cell is obtained from the searched cells, it may be determined whether the cell with the largest RSRP satisfies that the RSRP is greater than or equal to the target threshold and less than or equal to Qrxlevmin, if so, it is determined that the cell with the largest RSRP is the first target cell, otherwise, it is continuously determined whether other cells satisfy that the RSRP is greater than or equal to the target threshold and less than or equal to Qrxlevmin according to the above manner.

The frequency point scanning may include historical frequency point scanning and full-band frequency point scanning. That is, if RLF occurs during the VoLTE call, the terminal device may first perform historical frequency point scanning to recover the VoLTE call and record RSRPs of cells and cells searched during the historical frequency point scanning, if not successful, perform full-band frequency point scanning to recover the VoLTE call and record RSRPs of cells and cells searched during the full-band frequency point scanning, and if not successful, perform the method shown in fig. 1 to recover the VoLTE call.

As an example, the way for the terminal device to record the cell and the RSRP of the cell may be: and recording through a table, wherein one column of the table is the cell identification, and the other column of the table is the cell RSRP.

The above-mentioned history frequency point may be a frequency point recorded by the terminal device before the RLF occurs. Alternatively, the historical frequency point may be a frequency point corresponding to a cell that has resided for a certain period of time (for example, a seconds, where a is a number greater than 0) before RLF occurs in the terminal device. Full-band frequency point scanning may be understood as scanning all frequency points in all frequency bands supported by a terminal device.

Optionally, in some embodiments, the specific implementation of the scanning of the historical frequency points may be to perform frequency point scanning on M historical frequency points recorded by the terminal device based on P, where P is the maximum number of rounds of scanning of the M historical frequency points in a process of performing one time of scanning of the historical frequency points, and P and M are positive integers.

Specifically, in some embodiments, performing frequency point scanning on M historical frequency points based on P includes: executing a round of frequency band scanning aiming at M historical frequency points; and if the VoLTE conversation recovery based on the current round of frequency point scanning fails, executing next round of frequency point scanning aiming at the M historical frequency points until the VoLTE conversation recovery is successful or the round number of frequency point scanning aiming at the M historical frequency points is P.

Or it can be understood that the specific implementation manner of performing frequency point scanning on M historical frequency points recorded by the terminal device based on P is as follows: and circularly executing frequency point scanning on the M historical frequency points until the VoLTE call is recovered successfully or the number of times of circular execution is P.

The specific implementation manner of performing a round of frequency point scanning on the historical frequency points may be as follows: according to a target mode, executing a round of frequency point scanning aiming at M historical frequency points; the target mode comprises one of the following modes: carrying out received signal power detection on the M historical frequency points, and if a target historical frequency point with the received signal power meeting the preset power threshold requirement exists, carrying out cell search on the target historical frequency point; carrying out received signal power detection on the M historical frequency points, if a target historical frequency point with the received signal power meeting the preset power threshold requirement exists, carrying out cell search on the target historical frequency point, and executing a VoLTE call recovery step based on the searched cell when the cell is searched; carrying out reception power detection on the ith history frequency point in the M history frequency points, and if the reception signal power of the ith history frequency point meets the requirement of a preset power threshold, carrying out cell search on the ith history frequency point, wherein i =1, \8230M; and detecting the receiving power of the ith historical frequency point in the M historical frequency points, if the receiving signal power of the ith historical frequency point meets the preset power threshold requirement, performing cell search on the ith historical frequency point, and executing a VoLTE call recovery step based on the searched cell when the cell is searched, wherein i =1, \8230, M.

For example, the terminal device records 4 historical frequency points, which are respectively historical frequency point 1, historical frequency point 2, historical frequency point 3, and historical frequency point 4, and the specific way of performing a round of frequency point scanning on the 4 historical frequency points is as follows: and detecting the received signal power of the 4 historical frequency points, and if the received signal power detection result is that the received signal power of the historical frequency point 1 and the historical frequency point 3 meets the preset power threshold requirement, performing cell search on the historical frequency point 1 and the historical frequency point 3. Or the specific scanning mode for executing a round of frequency point scanning on the 4 historical frequency points is as follows: firstly, detecting the received signal power of a historical frequency point 1, if the received signal power of the historical frequency point 1 meets the requirement of a preset power threshold, carrying out cell search on the historical frequency point 1, then carrying out received signal power detection on the historical frequency point 2, if the received signal power of the historical frequency point 2 does not meet the requirement of the preset power threshold, carrying out received signal power detection on the historical frequency point 3, if the received signal power of the historical frequency point 3 meets the requirement of the preset power threshold, carrying out cell search on the historical frequency point 3, then carrying out received signal power detection on the historical frequency point 4, and if the received signal power of the historical frequency point 4 does not meet the requirement of the preset power threshold, completing one round of frequency point scanning aiming at the 4 historical frequency points.

Or for example, the terminal device records 4 historical frequency points, which are respectively historical frequency point 1, historical frequency point 2, historical frequency point 3, and historical frequency point 4, and the specific way of performing a round of frequency point scanning on the 4 historical frequency points is as follows: and detecting the received signal power of the 4 historical frequency points, if the received signal power detection result is that the received signal power of the historical frequency point 1 and the historical frequency point 3 meets the preset power threshold requirement, performing cell search on the historical frequency point 1 and the historical frequency point 3, and executing a VoLTE call recovery step based on the searched cells when the cells are searched. Or the specific scanning mode for executing a round of frequency point scanning on the 4 historical frequency points is as follows: firstly, carrying out received signal power detection on a historical frequency point 1, if the received signal power of the historical frequency point 1 meets the requirement of a preset power threshold, carrying out cell search on the historical frequency point 1, executing a VoLTE call recovery step based on the searched cell when the cell is searched, if the VoLTE call recovery fails, carrying out the received signal power detection on the historical frequency point 2, if the received signal power of the historical frequency point 2 does not meet the requirement of the preset power threshold, carrying out the received signal power detection on the historical frequency point 3, if the received signal power of the historical frequency point 3 meets the requirement of the preset power threshold, carrying out the cell search on the historical frequency point 3, and executing the VoLTE call recovery step based on the searched cell when the cell is searched, if the VoLTE call recovery fails, carrying out the received signal power detection on the historical frequency point 4, and if the received signal power of the historical frequency point 4 does not meet the requirement of the preset power threshold, completing a round of scanning aiming at the 4 historical frequency points.

Optionally, in some embodiments, a specific implementation manner of the full-band frequency point scanning may be: and detecting the received signal quality of the frequency point in each frequency band in each supported frequency band, and performing cell search on the frequency points with the received signal quality meeting the conditions. Here, the condition that the received signal quality satisfies may be that the received signal quality is higher than a predetermined threshold or that the received signal quality is ranked N1, where N1 is a predetermined parameter.

For example, the received signal quality of the frequency points in 2 frequency bands is detected, where the 2 frequency bands are respectively frequency band 1 and frequency band 2, where there are 2 frequency points in frequency band 1, respectively frequency point 1 and frequency point 2, and there are 3 frequency points in frequency band 2, respectively frequency point 3, frequency point 4, and frequency point 5. And if the quality of the received signals is higher than the preset threshold, performing cell search on the frequency point 1, the frequency point 4 and the frequency point 5. Or the 5 frequency points are ranked from high to low according to the quality of the received signals: frequency point 1, frequency point 3, frequency point 2, frequency point 4 and frequency point 5, if N1 is 3, then cell search is performed on frequency point 1, frequency point 2 and frequency point 2.

S120, based on the Qrxlevmin, the RSRP of the first target cell is reset, and the RSRP after the first target cell is reset is larger than the Qrxlevmin.

That is, if the RSRP of the first target cell is greater than or equal to the target threshold value and less than or equal to Qrxlevmin, the RSRP of the first target cell may be reset to a value greater than Qrxlevmin, so that the RSRP of the first target cell meets the S-criteria for cell camping, thereby enabling the terminal device to camp on the first target cell and initiate random access in the first target cell. Therefore, the problem of call drop caused by the fact that the RSRP of the cell is lower than the Qrxlevmin can be avoided by resetting the RSRP of the cell to be a value higher than the Qrxlevmin.

For example, if the RSRP of the first target cell is greater than the target threshold value and less than Qrxlevmin, the RSRP of the first target cell is reset to Qrxlevmin +1 so that the first target cell satisfies the S-criterion.

Further, the method shown in fig. 1 further includes: and executing a VoLTE call recovery operation on the first target cell based on the reset RSRP of the first target cell. Here, resuming VoLTE call operation includes: whether the first target Cell meets an S criterion (RSRP-Q _ rxlevmin > 0) is judged based on the RSRP after the first target Cell is reset, if the first target Cell meets the S criterion, the first target Cell is considered to be a Suitable Cell (Suitable Cell), downlink synchronization is carried out on the first target Cell, uplink random access is initiated in the first target Cell after the downlink synchronization, and the VoLTE call can be recovered after the uplink access is successful. Namely, the first target cell is resident, and after the residence is successful, the uplink random access process is initiated in the first target cell. And if the random access in the first target cell is successful, the VoLTE call recovery is successful.

Further, if the VoLTE call recovery in the first target cell fails and is not dropped based on the RSRP after the first target cell is reset, acquiring a second target cell, wherein the RSRP of the second target cell is greater than or equal to a target threshold value and less than or equal to Qrxlevmin; and resetting the RSRP of the second target cell based on the Qrxlevmin, wherein the RSRP after the second target cell is reset is larger than the Qrxlevmin.

That is, if the recovery of VoLTE call in a cell fails and the call is not dropped based on the RSRP after the cell is reset, the cell whose RSRP is greater than or equal to the target threshold value and less than or equal to Qrxlevmin is continuously acquired, and the RSRP of the cell is reset to a value greater than Qrxlevmin. Or it can be understood that the operation of acquiring the cell with RSRP greater than or equal to the target threshold value and less than or equal to Qrxlevmin and resetting the RSRP of the cell to the value greater than Qrxlevmin is executed in a loop until the successful VoLTE call is restored or the call is dropped.

On the basis of all the above embodiments, the method shown in fig. 1 further includes: if the call can not be restored or dropped after the first target cell restores the VoLTE call, the RSRP of the reset cell is restored to be the value before the reset. Therefore, the influence of the RSRP of the reset cell on the subsequent communication process of the terminal equipment can be avoided.

For example, the RSRP of cell 1 is greater than the target threshold and less than Qrxlevmin, the terminal device resets the RSRP of cell 1, but the terminal device fails to recover the VoLTE call in cell 1. The terminal equipment continuously judges whether the RSRP of the cell 2 is larger than or equal to the target threshold value and smaller than the Qrxlevmin or not, but the RSRP of the cell 2 is smaller than the target threshold value, the terminal equipment continuously judges whether the RSRP of the cell 3 is larger than or equal to the target threshold value and smaller than the Qrxlevmin or not, if the RSRP of the cell 3 is larger than the target threshold value and smaller than the Qrxlevmin, the terminal equipment resets the RSRP of the cell 3, and the VoLTE call is successfully recovered in the cell 3, the terminal equipment recovers the RSRPs of the cell 1 and the cell 3 to the values before the resetting.

As an example, the method shown in fig. 1 is applied to a scenario in which the moving speed of the terminal device is less than a preset speed threshold. That is, before acquiring the first target cell, the method shown in fig. 1 further includes: determining that the movement speed is less than or equal to a preset speed threshold.

A method for resuming a VoLTE call according to an embodiment of the present invention will be described in detail with reference to fig. 2. As shown in fig. 2, the method includes:

s202, the UE is determined to have RLF in the VoLTE call process and is in a low-speed moving state.

The low-speed moving state here may be considered as a state in which the moving speed is less than or equal to a preset speed threshold.

And S204, recording the cells searched in the historical frequency point scanning process and the RSRP of the cells, and judging whether the VoLTE conversation is successfully recovered based on the historical frequency point scanning.

And S206, if the recovery of the VoLTE call based on the historical frequency point scanning fails, judging whether the first round of full-band scanning is completed.

S208, if the first round of full-band scanning is completed and the VoLTE call is recovered based on the full-band scanning and failed, judging whether the RSRP of the cell meets the condition that the Qrxlevmin is not less than the RSRP is not less than the Actual _ min.

Optionally, if the first round of full band scanning is not completed, S204 and the following steps are executed.

It is understood that the terminal device may not complete a full band scan round due to the timeout of the T311 or T301 timer.

Actual _ min in S208 may correspond to a target threshold value in the method shown in fig. 1.

S210, if yes, the RSRP of the cell is reset, and the RSRP of the cell is reset to Qrxlevmin +1.

In S210, if not, S212 and the subsequent steps are directly performed.

Here, the no case includes a case where RSRP of the cell is smaller than Actual _ min, and a case where RSRP of the cell is larger than Qrxlevmin. If the RSRP of the cell is larger than the Qrxlevmin, the cell meets the S criterion, and the UE can reside and initiate random access.

S212, whether the UE accesses the cell or not is judged, and the VoLTE call is recovered or the call is dropped.

And S214, if the RSRP is not the reset value, restoring the RSRP of the cell with the reset RSRP to the value before the reset.

In S212, if the UE does not access the cell and the call is not dropped (the UE fails to recover VoLTE, but the RTP timer is not timed out), the process goes to S208 and the following steps.

As an example, determining whether the RSRP of the cell satisfies that Qrxlevmin ≧ RSRP ≧ Actual _ min is performed in order from top to bottom of the RSRP of the cell. That is, in S210, the cell with the highest RSRP is determined first, and the steps of S212 to S216 are executed, and if it is necessary to go to S210 and the subsequent steps in S216, the cell with the next highest RSRP is determined again, and the steps of S212 to S216 are executed. According to the method, all recorded cells are judged until the VoLTE call is recovered successfully.

Table 1 shows the results of outfield verification using the method shown in fig. 1 and 2 (after improvement) and the related method of the prior art (before improvement). In table 1, a/B indicates that the number of dropped calls for B VoLTE calls is a. Therefore, the call drop rate of the VoLTE call can be obviously reduced by the method provided by the embodiment of the invention.

TABLE 1

	Before improvement	After improvement
			Position 1	4/4	0/4
Position 2	0/4	0/4
			Rate of dropped calls	4/8	0/8

The VoLTE call recovery method according to the embodiment of the present invention is described in detail above with reference to fig. 1 and fig. 2, and the terminal device according to the embodiment of the present invention will be described in detail below with reference to fig. 3.

Fig. 3 is a schematic structural diagram of a terminal device according to an embodiment of the present invention. As shown in fig. 3, the terminal device 30 includes:

an obtaining module 31, configured to obtain a first target cell if a radio link failure TLF occurs during a VoLTE call, where an RSRP of the first target cell is greater than or equal to a target threshold and is less than or equal to a minimum threshold Qrxlevmin at which a terminal device receives a cell signal;

and the processing module 32 is configured to reset RSRP of the first target cell based on the Qrxlevmin, where the RSRP after the first target cell is reset is greater than the Qrxlevmin.

Optionally, as an embodiment, the processing module 32 is further configured to:

and executing a VoLTE call recovery operation on the first target cell based on the reset RSRP of the first target cell.

Optionally, as an embodiment, the obtaining module 31 is further configured to:

and if the processing module fails to recover the VoLTE call in the first target cell based on the RSRP after the first target cell is reset and does not drop the call, acquiring a second target cell, wherein the RSRP of the second target cell is greater than or equal to the target threshold value and less than or equal to the Qrxlevmin.

and if the VoLTE call recovery in the first target cell is successful or the call is dropped, recovering the RSRP of the reset cell to be the value before the reset.

Optionally, as an embodiment, the obtaining module 31 is specifically configured to:

carrying out frequency point scanning and recording cells searched in the frequency point scanning process;

and acquiring the first target cell from the searched cells.

and acquiring the first target cell from the searched cells based on the sequence of the RSRP from big to small.

Optionally, as an embodiment, the target threshold is related to a capability of a terminal device, where the capability of the terminal device includes at least one of a downlink receiving capability and an uplink random access capability.

The terminal device provided in the embodiment of the present invention can implement each process implemented by the terminal device in the method embodiments of fig. 1 to fig. 2, and is not described here again to avoid repetition.

Fig. 4 is a schematic diagram of a hardware structure of a terminal device for implementing various embodiments of the present invention, where the terminal device 400 includes, but is not limited to: radio frequency unit 401, network module 402, audio output unit 403, input unit 404, sensor 405, display unit 406, user input unit 407, interface unit 408, memory 409, processor 410, and power supply 411. Those skilled in the art will appreciate that the terminal device configuration shown in fig. 4 does not constitute a limitation of the terminal device, and that the terminal device may include more or fewer components than shown, or combine certain components, or a different arrangement of components. In the embodiment of the present invention, the terminal device includes, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a palm computer, a vehicle-mounted terminal, a wearable device, a pedometer, and the like.

The processor 410, if a radio link failure RLF occurs during a VoLTE call, acquires a first target cell, where an RSRP of the first target cell is greater than or equal to a target threshold and less than or equal to a minimum threshold Qrxlevmin at which a terminal device receives a cell signal; resetting the RSRP of the first target cell based on the Qrxlevmin, the RSRP after the first target cell is reset being greater than the Qrxlevmin.

It should be understood that, in the embodiment of the present invention, the radio frequency unit 401 may be used for receiving and sending signals during a message sending and receiving process or a call process, and specifically, receives downlink data from a base station and then processes the received downlink data to the processor 410; in addition, the uplink data is transmitted to the base station. Typically, radio unit 401 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. In addition, the radio unit 401 can also communicate with a network and other devices through a wireless communication system.

The terminal device provides wireless broadband internet access to the user through the network module 402, such as helping the user send and receive e-mails, browse web pages, and access streaming media.

The audio output unit 403 may convert audio data received by the radio frequency unit 401 or the network module 402 or stored in the memory 409 into an audio signal and output as sound. Also, the audio output unit 403 may also provide audio output related to a specific function performed by the terminal apparatus 400 (e.g., a call signal reception sound, a message reception sound, etc.). The audio output unit 403 includes a speaker, a buzzer, a receiver, and the like.

The input unit 404 is used to receive audio or video signals. The input Unit 404 may include a Graphics Processing Unit (GPU) 1041 and a microphone 4042, and the Graphics processor 4041 processes image data of a still picture or video obtained by an image capturing apparatus (such as a camera) in a video capturing mode or an image capturing mode. The processed image frames may be displayed on the display unit 106. The image frames processed by the graphic processor 4041 may be stored in the memory 409 (or other storage medium) or transmitted via the radio frequency unit 401 or the network module 402. The microphone 4042 may receive sound, and may be capable of processing such sound into audio data. The processed audio data may be converted into a format output transmittable to a mobile communication base station via the radio frequency unit 401 in case of the phone call mode.

The terminal device 400 further comprises at least one sensor 405, such as light sensors, motion sensors and other sensors. Specifically, the light sensor includes an ambient light sensor that adjusts the brightness of the display panel 4061 according to the brightness of ambient light, and a proximity sensor that turns off the display panel 4061 and/or the backlight when the terminal apparatus 400 is moved to the ear. As one of the motion sensors, the accelerometer sensor can detect the magnitude of acceleration in each direction (generally three axes), detect the magnitude and direction of gravity when stationary, and can be used to identify the terminal device posture (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration identification related functions (such as pedometer, tapping), and the like; the sensors 405 may also include a fingerprint sensor, a pressure sensor, an iris sensor, a molecular sensor, a gyroscope, a barometer, a hygrometer, a thermometer, an infrared sensor, etc., which will not be described in detail herein.

The display unit 406 is used to display information input by the user or information provided to the user. The Display unit 406 may include a Display panel 1061, and the Display panel 1061 may be configured in the form of a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED), or the like.

The user input unit 407 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the terminal device. Specifically, the user input unit 407 includes a touch panel 4071 and other input devices 4072. Touch panel 4071, also referred to as a touch screen, may collect touch operations by a user on or near it (e.g., operations by a user on or near touch panel 4071 using a finger, a stylus, or any suitable object or attachment). The touch panel 4071 may include two parts, a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, sends the touch point coordinates to the processor 410, receives a command from the processor 410, and executes the command. In addition, the touch panel 4071 can be implemented by using various types such as a resistive type, a capacitive type, an infrared ray, and a surface acoustic wave. In addition to the touch panel 4071, the user input unit 407 may also include other input devices 4072. Specifically, the other input devices 4072 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which are not described herein again.

Further, the touch panel 4071 can be overlaid on the display panel 4061, and when the touch panel 4071 detects a touch operation thereon or nearby, the touch operation is transmitted to the processor 410 to determine the type of the touch event, and then the processor 410 provides a corresponding visual output on the display panel 4061 according to the type of the touch event. Although in fig. 4, the touch panel 4071 and the display panel 4061 are two independent components to implement the input and output functions of the terminal device, in some embodiments, the touch panel 4071 and the display panel 4061 may be integrated to implement the input and output functions of the terminal device, which is not limited herein.

The interface unit 408 is an interface for connecting an external device to the terminal apparatus 400. For example, the external device may include a wired or wireless headset port, an external power supply (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device having an identification module, an audio input/output (I/O) port, a video I/O port, an earphone port, and the like. The interface unit 408 may be used to receive input (e.g., data information, power, etc.) from an external device and transmit the received input to one or more elements within the terminal apparatus 400 or may be used to transmit data between the terminal apparatus 400 and an external device.

The memory 409 may be used to store software programs as well as various data. The memory 409 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. Further, the memory 409 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.

The processor 410 is a control center of the terminal device, connects various parts of the entire terminal device by using various interfaces and lines, and performs various functions of the terminal device and processes data by operating or executing software programs and/or modules stored in the memory 409 and calling data stored in the memory 409, thereby performing overall monitoring of the terminal device. Processor 410 may include one or more processing units; preferably, the processor 410 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 410.

The terminal device 400 may further include a power supply 411 (e.g., a battery) for supplying power to various components, and preferably, the power supply 411 may be logically connected to the processor 410 through a power management system, so as to implement functions of managing charging, discharging, and power consumption through the power management system.

In addition, the terminal device 400 includes some functional modules that are not shown, and are not described in detail here.

Preferably, an embodiment of the present invention further provides a mobile terminal, which includes a processor 410, a memory 409, and a computer program that is stored in the memory 409 and can be run on the processor 410, and when the computer program is executed by the processor 410, the processes of the method for preventing false triggering of a fingerprint sensor embodiment are implemented, and the same technical effects can be achieved, and are not described herein again to avoid repetition.

An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements each process of the foregoing method for recovering a VoLTE call, and can achieve the same technical effect, and in order to avoid repetition, the computer program is not described herein again. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.

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 phrases "comprising a component of' 8230; \8230;" does not exclude the presence of another like element in a process, method, article, or apparatus that comprises the element.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A method for recovering a voice over LTE (Voice over Long term evolution) call is applied to terminal equipment and is characterized by comprising the following steps:

if Radio Link Failure (RLF) occurs in the VoLTE call process, acquiring a first target cell, wherein the RSRP of the first target cell is greater than or equal to a target threshold value and less than or equal to a minimum threshold value Qrxlevmin of a terminal device for receiving cell signals; the target threshold value is related to the capability of the terminal equipment;

resetting the RSRP of the first target cell based on the Qrxlevmin, the RSRP after the first target cell is reset being greater than the Qrxlevmin;

performing a VoLTE call recovery operation on the first target cell based on the RSRP after the first target cell is reset;

if the VoLTE call recovery in the first target cell fails and the call is not dropped based on the RSRP after the first target cell is reset, acquiring a second target cell, wherein the RSRP of the second target cell is greater than or equal to the target threshold value and less than or equal to the Qrxlevmin;

resetting the RSRP of the second target cell based on the Qrxlevmin, the RSRP after the second target cell is reset being greater than the Qrxlevmin.

2. The method of claim 1, further comprising:

3. The method of any of claims 1-2, wherein the obtaining the first target cell comprises:

and acquiring the first target cell from the searched cells.

4. The method of claim 3, wherein the obtaining the first target cell from the searched cells comprises:

5. The method according to any of claims 1 to 2, wherein the capabilities of the terminal device comprise at least one of downlink reception capabilities and uplink random access capabilities.

6. A terminal device, comprising:

an obtaining module, configured to obtain a first target cell if a radio link failure TLF occurs during a VoLTE call, where an RSRP of the first target cell is greater than or equal to a target threshold and less than or equal to a minimum threshold Qrxlevmin at which a terminal device receives a cell signal; the target threshold value is related to the capability of the terminal equipment;

a processing module configured to reset an RSRP of the first target cell based on the Qrxlevmin, where the RSRP after the first target cell is reset is greater than the Qrxlevmin;

the processing module is further configured to: based on the RSRP after the first target cell is reset, performing VoLTE call recovery operation on the first target cell;

the acquisition module is further configured to: if the processing module fails to recover the VoLTE call in the first target cell based on the RSRP after the first target cell is reset and does not drop the call, acquiring a second target cell, wherein the RSRP of the second target cell is greater than or equal to the target threshold value and less than or equal to the Qrxlevmin;

the processing module is further configured to: resetting the RSRP of the second target cell based on the Qrxlevmin, the RSRP after the second target cell reset being greater than the Qrxlevmin.

7. The terminal device of claim 6, wherein the processing module is further configured to:

8. The terminal device according to any one of claims 6 to 7, wherein the obtaining module is specifically configured to:

and acquiring the first target cell from the searched cells.

9. The terminal device of claim 8, wherein the obtaining module is specifically configured to:

10. The terminal device according to any of claims 6 to 7, wherein the capabilities of the terminal device comprise at least one of downlink reception capabilities and uplink random access capabilities.

11. A terminal device, comprising: memory, processor and computer program stored on the memory and executable on the processor, which when executed by the processor implements the steps of the VoLTE call recovery method according to any one of claims 1 to 5.

12. A computer readable medium having stored thereon a computer program which, when being executed by a processor, carries out the steps of the method of VoLTE call recovery according to any one of claims 1 to 5.