CN113709682B

CN113709682B - Call processing method, device, terminal equipment and storage medium

Info

Publication number: CN113709682B
Application number: CN202110915543.6A
Authority: CN
Inventors: 张健
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2021-08-10
Filing date: 2021-08-10
Publication date: 2023-04-07
Anticipated expiration: 2041-08-10
Also published as: CN113709682A; WO2023016195A1

Abstract

The embodiment of the application discloses a call processing method, a call processing device, terminal equipment and a storage medium, belongs to the technical field of communication, and can solve the problem of call failure caused by DRB release in a voice service flow based on evolved packet system fallback. The method comprises the following steps: after the terminal equipment initiates a service request of a call based on fallback of an evolved packet system, receiving a redirection message sent by network equipment according to the service request, wherein the redirection message is used for indicating the terminal equipment to be redirected from an NR cell to a first LTE cell; under the condition that the first LTE cell is an abnormal cell and a normal second LTE cell is detected, switching from the NR cell to the second LTE cell so as to enable the call to be connected; the abnormal cell is a cell in which the frequency of releasing the DRB event is greater than or equal to a frequency threshold value.

Description

Call processing method, device, terminal equipment and storage medium

Technical Field

The present application relates to the field of communications technologies, and in particular, to a call processing method and apparatus, a terminal device, and a storage medium.

Background

Currently, voice traffic in a New Radio (NR) cell of a fifth generation mobile communication technology (5th generation, 5g) can be carried to a Long Term Evolution (LTE) cell by an Evolved Packet System Fall Back (EPSFB) mode.

The voice service process of the terminal equipment in the NR cell based on the EPSFB is as follows: the method comprises the steps that a terminal device sends a Service Request (Service Request) of a call (Mo call) to a network device, the network device sends a redirection message to the terminal device after receiving the Service Request, and the redirection message is used for indicating the terminal device to redirect from an NR cell to an LTE cell and sending an LTE reconfiguration message to the terminal device; and the terminal equipment is switched (handover) to the LTE cell, and the call is successfully connected.

However, sometimes, in the reconfiguration message corresponding to the LTE cell issued by the network device, a Data Radio Bearer (DRB) corresponding to a Quality of Service Class Identifier (QCI) is released, and the DRB release may cause a call failure.

Disclosure of Invention

The embodiment of the application provides a call processing method, a call processing device, terminal equipment and a storage medium, which are used for solving the problem of call failure caused by DRB release in a voice service flow based on evolved packet system fallback.

In a first aspect of the embodiments of the present application, a call processing method is provided, which is applied to a terminal device, and the method includes: after the terminal equipment initiates a service request of a call based on the fallback of an evolved packet system, receiving a redirection message sent by network equipment according to the service request, wherein the redirection message is used for indicating the terminal equipment to be redirected from an NR cell to a first LTE cell; under the condition that the first LTE cell is an abnormal cell and a normal second LTE cell is detected, switching from the NR cell to the second LTE cell so as to enable the call to be connected; the abnormal cell is a cell in which the frequency of releasing the DRB event is greater than or equal to a frequency threshold value.

In a second aspect of the embodiments of the present application, there is provided a call processing apparatus, including: the device comprises a receiving module and a switching module; the receiving module is configured to receive a redirection message sent by a network device according to a service request after the terminal device initiates the service request of a call based on an evolved packet system fallback, where the redirection message is used to instruct the terminal device to redirect from a new air interface NR cell to a first long term evolution LTE cell; the switching module is used for switching from the NR cell to a second LTE cell to make the call connected under the condition that the first LTE cell is an abnormal cell and a normal second LTE cell is detected; the abnormal cell is a cell in which the frequency of the DRB releasing event is greater than or equal to a frequency threshold.

In a third aspect of embodiments of the present application, a terminal device is provided, including: a memory storing executable program code; and a processor and transceiver coupled to the memory; the processor invokes the executable program code stored in the memory, which when executed by the processor causes the processor and transceiver to implement the steps of the call processing method as described in the first aspect.

A fourth aspect of the embodiments of the present application provides a readable storage medium, on which a program or instructions are stored, which when executed by a processor implement the steps of the call processing method according to the first aspect.

In a fifth aspect of the embodiments of the present application, there is provided a chip, where the chip includes a processor and a communication interface, where the communication interface is coupled to the processor, and the processor is configured to execute a program or instructions to implement the call processing method according to the first aspect.

In the embodiment of the application, after the terminal device initiates a service request of a call based on fallback of an evolved packet system, a redirection message sent by a network device according to the service request may be received, where the redirection message is used to instruct the terminal device to redirect from an NR cell to a first LTE cell; under the condition that the first LTE cell is an abnormal cell and a normal second LTE cell is detected, switching from the NR cell to the second LTE cell so as to connect the call; the abnormal cell is a cell in which the frequency of releasing the DRB event is greater than or equal to a frequency threshold value. In the embodiment of the application, in the voice service establishment process based on the EPSFB, if the first LTE cell is an abnormal cell (a cell in which the frequency of the DRB release event is greater than or equal to the frequency threshold), the NR cell is switched to a second LTE cell that is not the abnormal cell, so that it can be ensured that a call failure due to the terminal device being switched to the cell (the first LTE cell) that releases the DRB does not occur.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings used in the description of the embodiments and the prior art will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and other drawings can be obtained according to the drawings.

Fig. 1 is a schematic architecture diagram of a communication system according to an embodiment of the present application;

fig. 2A is a flowchart illustrating a call processing method according to an embodiment of the present application;

fig. 2B is a second schematic flowchart of a call processing method according to an embodiment of the present application;

fig. 2C is a third schematic flowchart of a call processing method according to an embodiment of the present application;

fig. 2D is a fourth schematic flowchart of a call processing method according to an embodiment of the present application;

fig. 2E is a fifth flowchart illustrating a call processing method according to an embodiment of the present application;

fig. 2F is a sixth schematic flowchart of a call processing method according to an embodiment of the present application;

fig. 3 is a seventh schematic flowchart of a call processing method according to an embodiment of the present application;

fig. 4 is a block diagram of a call processing device according to an embodiment of the present application;

fig. 5 is a schematic diagram of a hardware structure of a terminal device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below clearly with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present disclosure.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/", and generally means that the former and latter related objects are in an "or" relationship.

From 4G LTE, the Voice service implementation scheme is no longer only a 2G/3G network, and provides, for example, voice service and other value-added services simply through a circuit domain network, but rather, a mode of implementing that Voice service is carried over an IP network, that is, a Voice over LTE (Voice over LTE ), by designing an Internet Protocol (IP) Multimedia Subsystem (IMS) interconnected between networks is used to implement that all services of the 2G/3G circuit domain are all "IP" in the 4G network. In the gradual deployment and extension process of the 4G network, the network is in different stages of development and the consideration of the Continuity of the Voice service, and 4G also proposes transition schemes such as Circuit Switched Fallback (CSFB) and Single Radio Voice Call Continuity (SRVCC).

The 5G NR Voice scheme design extends the way that 4G LTE carries Voice service through an IP network, and carries Voice service through a 5G network (wireless network + core network) and an IMS system, which is called a Voice over NR (VoNR). Similarly, considering that 5G is deployed in different stages and in different scales, 4G networks are already widely deployed and may exist in the future for a long time, and the requirement for voice service continuity guarantee is also necessary, the fallback scheme design is also necessary, so the evolved packet system fallback scheme is also one of the 5G voice schemes. The EPSF mainly refers to the way of dropping from 5G to 4G and implementing voice service through VoLTE, but because there are many voice schemes in 4G networks, when the wireless environment of 4G networks is poor, inevitably, the UE will complete voice service through the way of CSFB.

In the embodiment of the present application, the method is mainly applied to an evolved packet system fallback scheme in a 5G voice scheme. In the prior art, in a voice service flow establishment process based on an evolved packet system fallback scheme, some network devices (for example, overseas network devices) send a reconfiguration message to a terminal device, where the reconfiguration message includes that the network device releases a DRB (for example, DRB 3) corresponding to a QCI (for example, the QCI is 1), and when the terminal device is switched from an NR cell to an LTE cell that releases the DRB, and the terminal device detects that the DRB is released and is not reestablished within a preset time duration (for example, 6 seconds), the terminal device may actively report a session termination message (BYE) that carries a cause value of Media bearer loss (Media bearer loss) to the network device, thereby causing a call failure. For this reason, the call failure rate increases.

Therefore, in order to solve the above technical problem, in this embodiment of the application, after the terminal device initiates a service request of a call based on evolved packet system fallback, a redirection message sent by the network device according to the service request may be received, where the redirection message is used to instruct the terminal device to redirect from an NR cell to a first LTE cell; under the condition that the first LTE cell is an abnormal cell and a normal second LTE cell is detected, switching from the NR cell to the second LTE cell so as to enable the call to be connected; the abnormal cell is a cell in which the frequency of releasing the DRB event is greater than or equal to a frequency threshold value. In the embodiment of the application, in the voice service establishment process based on the EPSFB, if the first LTE cell is an abnormal cell (a cell in which the frequency of the DRB release event is greater than or equal to the frequency threshold), the NR cell is switched to a second LTE cell that is not the abnormal cell, so that it can be ensured that a call failure due to the terminal device being switched to the cell (the first LTE cell) that releases the DRB does not occur.

Fig. 1 shows a block diagram of a wireless communication system to which embodiments of the present application are applicable. The wireless communication system comprises a terminal device 11 and at least two network devices 12 (shown as one network device 12 in the figure). Wherein, the terminal Device 11 may also be called a terminal or a User Equipment (UE), the terminal Device 11 may be a Mobile phone, a Tablet Personal Computer (Tablet Personal Computer), a Laptop Computer (Laptop Computer) or a notebook Computer, a Personal Digital Assistant (PDA), a palmtop Computer, a netbook, an ultra-Mobile Personal Computer (UMPC), a Mobile Internet Device (MID), a Wearable Device (Wearable Device) or a vehicle-mounted Device (VUE), a pedestrian terminal (PUE), and other terminal side devices, the Wearable Device includes: smart watches, bracelets, earphones, glasses, and the like. It should be noted that the specific type of the terminal device 11 is not limited in the embodiments of the present application. The Network device 12 may be a Network device and may include one or more access Network devices or core networks, wherein the access Network device may be referred to as a Base Station, a node B, an evolved node B, an access Point, a Base Transceiver Station (BTS), a radio Base Station, a radio Transceiver, a Basic Service Set (BSS), an Extended Service Set (ESS), a node B, an evolved node B (eNB), a home node B, a home evolved node B, a WLAN access Point, a WiFi node, a Transmission Receiving Point (TRP), a Network Server (Network Server, NW), or some other suitable term in the field, as long as the same technical effect is achieved, the access Network device is not limited to a specific technical vocabulary, and it should be noted that in the embodiment of the present application, only the Base Station in the NR system, the Base Station in the LTE system, and the like are taken as an example, but not limited to a specific type.

The call processing method provided by the embodiment of the present application is described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.

An execution main body of the call processing method provided in the embodiment of the present application may be the terminal device (including a mobile terminal device and a non-mobile terminal device), or may also be a functional module and/or a functional entity capable of implementing the call processing method in the terminal device, which may be determined specifically according to actual use requirements, and the embodiment of the present application is not limited.

As shown in fig. 2A, an embodiment of the present application provides a call processing method. The following takes an execution subject as a terminal device as an example, and exemplarily describes the call processing method provided in the embodiment of the present application. The method may include steps 201 through 202 described below.

201. After the terminal equipment initiates a service request of a call based on the fallback of an evolved packet system, the terminal equipment receives a redirection message sent by the network equipment according to the service request.

Wherein the redirection message is used for instructing the terminal device to redirect from the NR cell to the first LTE cell.

It will be appreciated that when the terminal device needs to place a call based on evolved packet system fallback, the terminal device initiates a service request for the evolved packet system fallback based call to a network device (e.g., NW). The network device receives the service request, generates a redirection message according to the service request, then sends the redirection message to the terminal device, and finally sends a reconfiguration message (the reconfiguration message may release the DRB).

It should be noted that, in this embodiment of the application, before the terminal device is handed over to the first LTE cell, the terminal device cannot know whether the network device releases the DRB according to the reconfiguration message, and after a call failure, it can know that the call back is ended due to the release of the DRB.

202. And under the condition that the first LTE cell is an abnormal cell and the normal second LTE cell is detected, the terminal equipment is switched from the NR cell to the second LTE cell so as to make the call connected.

The abnormal cell is a cell in which the frequency of releasing the DRB event is greater than or equal to a frequency threshold value.

It can be understood that the time threshold may be determined according to an actual use condition, and the embodiment of the present application is not limited. For example, the number threshold may be 2.

It can be understood that, each time the terminal device detects that a DRB release event occurs in a cell, it records a DRB release event for the cell once, sets a counter, accumulates the number of times of the DRB release event occurring in the cell, and sets the cell as an abnormal cell when the number of times of the DRB release event occurring in the counter is greater than or equal to a threshold value of the number of times.

It can be understood that the first LTE cell is a cell in which the number of times of DRB release events is greater than or equal to the number threshold, and the normal second LTE cell is a cell in which DRB release events do not occur, or a cell in which the number of times of DRB release events is less than the number threshold. After receiving the redirection message, the terminal device determines a first LTE cell according to the redirection message, ignores the redirection message and switches from the NR cell to a second LTE cell when the first LTE cell is an abnormal cell and a second LTE cell (and a normal LTE cell) which is not the abnormal cell exists, so that the call is connected.

Optionally, the normal second LTE cell may further satisfy (noted as the first condition) at least one of the following: adjacent to a first LTE cell; a cell in which Reference Signal Received Power (RSRP) is greater than or equal to a Power threshold; a Reference Signal Receiving Quality (RSRQ) greater than or equal to a Quality threshold; the Signal to Interference plus Noise Ratio (SINR) is greater than or equal to the scaling threshold.

It can be understood that the power threshold may be determined according to actual usage requirements, and the embodiment of the present application is not limited. For example, the power threshold may be-105 dBm.

It can be understood that the quality threshold may be determined according to actual use requirements, and the embodiment of the present application is not limited.

It can be understood that the proportional threshold may be determined according to actual use requirements, and the embodiment of the present application is not limited.

It can be understood that the condition that the second LTE cell satisfies may be determined according to an actual usage requirement, and the embodiment of the present application is not limited.

For the second LTE cell, there are several cases:

optionally, the second LTE cell is adjacent to the first LTE cell. Further optionally, the second LTE cell may be any one of cells adjacent to the first LTE cell; the second LTE cell may also be the best RSRP in cells neighboring the first LTE cell.

Optionally, the second LTE cell is adjacent to the first LTE cell, and the second LTE cell meets the target condition. Further optionally, the second LTE cell may be any one of cells adjacent to the first LTE cell and satisfying the target condition; the second LTE cell may also be adjacent to the first LTE cell, and RSRP is the best among cells in which the second LTE cell meets the target conditions.

Optionally, the second LTE cell meets the target condition. Further optionally, the second LTE cell may be any one of the cells satisfying the target condition; the second LTE cell may be the best RSRP among the cells that meet the target conditions.

Optionally, the second LTE cell is any one of the LTE cells satisfying the above conditions.

Optionally, the second LTE cell is the best RSRP in the LTE cells that satisfy the above conditions.

Wherein the target conditions include at least one of: a cell with RSRP greater than or equal to a power threshold; RSRQ is greater than or equal to a quality threshold; the SINR is greater than or equal to a scaling threshold.

For the target conditions, there are several cases:

optionally, the target condition may include a cell having an RSRP greater than or equal to a power threshold.

Optionally, the target condition may comprise RSRQ being greater than or equal to a quality threshold.

Optionally, the target condition may include the SINR being greater than or equal to a scaling threshold.

Optionally, the target condition may include a cell having RSRP greater than or equal to a power threshold, and RSRQ greater than or equal to a quality threshold.

Optionally, the target condition may include a cell with RSRP greater than or equal to a power threshold, and a SINR greater than or equal to a scaling threshold.

Optionally, the target condition may include RSRQ being greater than or equal to a quality threshold and SINR being greater than or equal to a scaling threshold.

Alternatively, the target conditions may include cells with RSRP greater than or equal to a power threshold, RSRQ greater than or equal to a quality threshold, and SINR greater than or equal to a scaling threshold.

In the embodiment of the application, when the second LTE cell and the first LTE cell are adjacent, the signal quality of the first LTE cell is better, and when the second LTE meets the target condition, the signal quality of the second LTE cell is better.

The second LTE cell has better signal quality, so that the call disconnection caused by call drop due to poor signal quality in the call process can be avoided.

Optionally, in this embodiment of the application, when detecting that the number of times that the first LTE cell releases the DRB time is greater than or equal to the number threshold, the terminal device may set a specific identifier (for example, a specific priority) for the first LTE cell to represent that the first LTE cell is an abnormal cell, may add cell information (for example, identity Information (ID), frequency point information, and the like) of the first LTE cell to a blacklist to represent that the first LTE cell is an abnormal cell, may add the first LTE cell to an abnormal cell group to represent that the first LTE cell is an abnormal cell, and may also represent that the first LTE cell is an abnormal cell by other ways, which is not limited in this embodiment of the application.

Exemplarily, with reference to fig. 2A and fig. 2B, before the step 201, the call processing method provided in the embodiment of the present application may further include a step 203 described below, and after the step 201, the call processing method provided in the embodiment of the present application may further include a step 204 described below.

203. And under the condition that the frequency of the DRB releasing event occurring in the first LTE cell in the first period is detected to be larger than or equal to the frequency threshold value, the terminal equipment marks the first LTE cell as an abnormal cell.

The duration of the first period may be determined according to an actual use condition, and the embodiment of the present application is not limited.

In the embodiment of the application, the terminal device may mark the first LTE cell as an abnormal cell in a target manner. For example, the terminal device may mark the first LTE cell as an abnormal cell by reducing the priority of the first LTE cell, the terminal device may also mark the first LTE cell as an abnormal cell by adding the first LTE cell into a blacklist, and the terminal device may also mark the first LTE cell as an abnormal cell by other ways.

204. And under the condition that the first LTE cell is detected to be marked as the abnormal cell, the terminal equipment determines that the first LTE cell is the abnormal cell.

It can be understood that, if the number of times of the DRB release event occurring in the first LTE cell in the first period is greater than or equal to the number threshold, the first LTE cell is marked as an abnormal cell, and after the first period, if it is detected that the first LTE cell is marked as an abnormal cell, the first LTE cell is determined as an abnormal cell.

In the embodiment of the application, the condition that the first LTE cell is marked as the abnormal cell is set to be that the frequency of the DRB release event occurring in the first LTE cell in the first period is greater than or equal to the frequency threshold, so that the first LTE cell can be prevented from being marked as the abnormal cell due to the DRB release event occurring accidentally multiple times (or due to the DRB release event caused by other reasons) in a long time, and therefore the terminal device cannot be switched to the actually normal first LTE cell to influence the normal establishment of a call.

Alternatively, with reference to fig. 2B, as shown in fig. 2C, the step 203 may be specifically realized by the following step 203a, and the step 204 may be specifically realized by the following step 204 a.

203a, the terminal device marks the first LTE cell as an abnormal cell by setting the priority of the first LTE cell as the lowest priority corresponding to the call.

204a, under the condition that the priority of the first LTE cell is detected to be the lowest priority, the terminal device determines that the first LTE cell is an abnormal cell.

It is understood that the cell corresponding to the lowest priority is a cell in which the number of times of the DRB release event occurring in the first period is greater than or equal to the number threshold. The cell that is not the lowest priority is not a cell for which the number of times the DRB release event occurs within the first period is greater than or equal to the number threshold. The LTE cell with the lowest priority has a lower priority than the LTE cells with lower priorities, and is the priority of the abnormal cell.

In the embodiment of the application, the first cell is marked as the abnormal cell in a mode of reducing the priority of the first LTE cell to the lowest priority, so that the first LTE cell is determined to be the abnormal cell under the condition that the priority of the first LTE cell is detected to be the lowest priority, the process of determining whether the first LTE cell is the abnormal cell can be simplified, the efficiency of determining whether the first LTE cell is the abnormal cell can be improved, and power consumption can be saved.

Alternatively, with reference to fig. 2B, as shown in fig. 2D, the step 203 may be specifically realized by the following step 203B, and the step 204 may be specifically realized by the following step 204B.

203b, the terminal device marks the first LTE cell as an abnormal cell by adding the first LTE cell into a blacklist corresponding to the call.

204b, under the condition that the first LTE cell is detected to be the cell in the blacklist, the terminal equipment determines that the first LTE cell is an abnormal cell.

It is to be understood that the cells in the blacklist are cells in which the number of times of the DRB release event occurring within the first period is greater than or equal to the number threshold.

In the embodiment of the application, the first LTE cell is marked as the abnormal cell in a mode of adding the first LTE cell into the blacklist, so that the first LTE cell is determined to be the normal cell under the condition that the first LTE cell is detected to be the cell in the blacklist, the process of determining whether the first LTE cell is the abnormal cell can be simplified, the efficiency of determining whether the first LTE cell is the abnormal cell can be improved, and power consumption can be saved.

Optionally, in this embodiment of the present application, the cell may be marked as an abnormal cell when the number of times that the cell has the DRB release event in the first period is greater than or equal to the number threshold. Or in the case that the frequency of the DRB release event occurring in the first period of the cell is greater than or equal to the frequency threshold, the marked cell may be an abnormal cell in the second period, and after the second period, the marking process that the cell is an abnormal cell may be cancelled. If the cell indicated by the redirection message is detected to be marked as an abnormal cell, determining that the cell is the abnormal cell; and if the cell indicated by the redirection message is not marked as the abnormal cell, determining that the cell is a normal cell.

Optionally, with reference to fig. 2B, as shown in fig. 2E, the step 203 may be specifically implemented by the following step 203c, and after the step 202, the call processing method provided in the embodiment of the present application may further include the following step 205.

203c, the terminal equipment marks the first LTE cell as an abnormal cell in the second period.

205. And after the second period, the terminal equipment cancels the marking processing of the first LTE cell as the abnormal cell.

Wherein the second period is subsequent to the first period. The duration of the second period may be determined according to an actual use condition, and the embodiment of the present application is not limited.

It can be understood that the abnormal cell is a cell in which the number of times of the DRB release event occurring in the first period is greater than or equal to the number threshold, the first period is a time period before the current time (receiving the redirection message) and whose duration from the current time is less than or equal to a target duration, and the target duration is a duration of the second period.

In the embodiment of the application, the terminal device may set a timer, the timing duration may be a duration of a second period, and before the timer expires, the first LTE cell is marked as an abnormal cell; after the timer is overtime, canceling the marking processing of the first LTE cell as an abnormal cell; after the timer is overtime, the first LTE cell of the terminal equipment is set as a normal cell and is not marked as an abnormal cell any more.

The marking process that the first LTE cell is an abnormal cell is cancelled, and it can be understood that, after the second period, the terminal device may cancel the setting of the lowest priority and delete the information of the first LTE cell from the blacklist.

In the embodiment of the application, the first LTE cell is marked as the abnormal cell at the second period, and the marking of the first LTE cell as the abnormal cell is cancelled after the second period, because the first LTE cell may be repaired, when the first LTE cell is repaired, the DRB release event does not occur, so that the first LTE cell does not need to be marked as the abnormal cell, and when the redirection message is received, the terminal device can be timely switched to the first LTE cell, so that the normal establishment of the call can be prevented from being influenced.

Optionally, the release DRB event comprises at least one of: releasing DRB in the call establishment process corresponding to the call; and releasing the DRB in the call establishment process of the LTE Voice scheme (Voice over LTE).

It can be understood that, the DRB is released in the call establishment procedure corresponding to the call, that is, the DRB is released in the reconfiguration message of the call establishment procedure of the voice service based on the EPSFB.

In one possible scenario, the DRB release event is a DRB release during a call setup procedure corresponding to the call.

One possible scenario, the release DRB event is to release DRB during VoLTE call setup.

Another possible scenario, the release DRB event includes: and releasing the DRB in the call establishment process corresponding to the call, and releasing the DRB in the VoLTE call establishment process. It can be understood that, every time the DRB release is detected in the call setup process corresponding to the call, the DRB release event is counted, and every time the DRB release is detected in the VoLTE call setup process, the DRB release event is also counted.

In the embodiment of the application, a plurality of possible DRB releasing events are provided, and the most appropriate DRB releasing event can be determined according to the situation in actual use.

Optionally, with reference to fig. 2A and as shown in fig. 2F, the call processing method provided in the embodiment of the present application may further include steps 206 to 207 described below.

206. When the normal LTE cell is not detected and the 3G cell is detected, the terminal device is switched from the NR cell to the first LTE cell and is switched from the first LTE cell to the 3G cell, so that the call is connected.

In the embodiment of the application, if no LTE cell which is not an abnormal cell exists and a proper 3G cell exists, the call is switched to the first LTE cell from the NR cell, and then the 3G cell is switched from the first LTE cell, so that the call connection can be ensured, and the problem of call failure caused by the release of the DRB when the call is switched to the first LTE cell can be solved.

207. Under the condition that a normal LTE cell is not detected, a 3G cell is not detected, and a 2G cell is detected, the terminal equipment is switched to the first LTE cell from the NR cell and switched to the 2G cell from the first LTE cell, so that the call is connected.

In the embodiment of the application, if no LTE cell which is not an abnormal cell exists (that is, all LTE cells are abnormal cells), no appropriate 3G cell exists, but an appropriate 2G cell exists, the call is switched from the NR cell to the first LTE cell, and then the first LTE cell is switched to the 2G cell, so that the call can be guaranteed to be connected, and the problem of call failure caused by the release of the DRB when the call is switched to the first LTE cell can be solved.

It should be noted that, when initiating a service request of an EPSFB-based call, the network device is a network device corresponding to an NR cell; when receiving the redirection message and the reconfiguration message, the network device is a network device corresponding to the first LTE cell; when the network equipment is switched to a second LTE cell, the network equipment is corresponding to the second LTE cell; when the network equipment is switched to the 3G cell, the network equipment is the network equipment corresponding to the 3G cell; when the network device is switched to the 2G cell, the network device is the network device corresponding to the 2G cell. The network devices may be the same or different, and the embodiments of the present application are not limited.

In this embodiment of the present application, after the service request is initiated and before the call is ended, if the terminal device receives a redirection message 1 indicating that the terminal device is redirected to the NR cell, the terminal device may ignore the redirection message 1. After the call is ended, if the redirection message 1 is received, the terminal device may be switched to the NR cell according to the redirection message 1. Therefore, the problem that the call is failed because the terminal equipment is redirected to the NR cell according to the redirection message 1 before the call is ended can be avoided.

Optionally, after the step 201, the call processing method provided in the embodiment of the present application may further include a step 208 described below.

208. In the case where the first LTE cell is not an abnormal cell, the terminal apparatus switches from the NR cell to the first LTE cell to make the call through.

It can be understood that when the first LTE cell is not an abnormal cell, and the terminal device is handed over from the NR cell to the first LTE cell, the fast VoLTE connection of the terminal device in the first LTE cell is successful.

As shown in fig. 3, the call processing method provided in the embodiment of the present application can be specifically implemented by the following steps 301 to 309.

301. After the terminal device initiates a service request of the EPSFB-based call, the terminal device receives a redirection message sent by the network device according to the service request.

302. The terminal device determines whether the first LTE cell is an abnormal cell.

If the first LTE cell is an abnormal cell, performing step 303; if the first LTE cell is not an abnormal cell, the following step 309 is executed.

303. And the terminal equipment detects whether a normal second LTE cell exists or not.

If there is a second LTE cell that is not an abnormal cell, execute step 304; if there is no second LTE cell that is not an abnormal cell, step 305 described below is performed.

304. The terminal device switches from the NR cell to the second LTE cell to make the call through.

305. The terminal device detects whether a 3G cell exists.

If there is a 3G cell, execute the following step 306; if not, the following step 307 is performed.

306. And the terminal equipment is switched to the first LTE cell from the NR cell and then switched to the 3G cell from the first LTE cell so as to make the call connected.

307. The terminal device detects whether a 2G cell exists.

If there is a 2G cell, the following step 308 is performed.

308. And the terminal equipment is switched to the first LTE cell from the NR cell and then switched to the 2G cell from the first LTE cell so as to make the call connected.

309. The terminal device is handed over from the NR cell to the first LTE cell.

For the description of the above steps 301 to 309, reference may be made to the related description of the above steps 201 to 208, which is not repeated herein.

Fig. 4 is a block diagram of a call processing device according to an embodiment of the present application, and as shown in fig. 4, the call processing device includes: a receiving module 401 and a switching module 402; the receiving module 401 is configured to receive a redirection message sent by a network device according to a service request after the terminal device initiates the service request of a call based on an Evolved Packet System Fallback (EPSFB), where the redirection message is used to instruct the terminal device to redirect from a new air interface (NR) cell to a first Long Term Evolution (LTE) cell; the handover module 402 is configured to, when the first LTE cell is an abnormal cell and a normal second LTE cell is detected, handover the first LTE cell to the second LTE cell from the NR cell so as to connect the call; the abnormal cell is a cell in which the frequency of DRB releasing events is greater than or equal to a frequency threshold.

Optionally, the second LTE cell satisfies at least one of: adjacent to a first LTE cell; a cell with Reference Signal Received Power (RSRP) greater than or equal to a power threshold; the Reference Signal Received Quality (RSRQ) is greater than or equal to a quality threshold; the signal to interference plus noise ratio SINR is greater than or equal to the scaling threshold.

Optionally, the call processing apparatus further includes: a marking module and a determining module; the marking module is configured to mark the first LTE cell as an abnormal cell when detecting that the number of times of the DRB release event occurring in the first LTE cell in the first period is greater than or equal to the number threshold before receiving the redirection message sent by the network device according to the service request; the determining module is configured to determine that the first LTE cell is an abnormal cell when detecting that the first LTE cell is marked as an abnormal cell after receiving a redirection message sent by the network device according to the service request.

Optionally, the marking module is specifically configured to mark the first LTE cell as an abnormal cell by setting a priority of the first LTE cell as a lowest priority corresponding to the call; the determining module is specifically configured to determine that the first LTE cell is an abnormal cell when it is detected that the priority of the first LTE cell is the lowest priority.

Optionally, the marking module is specifically configured to mark the first LTE cell as an abnormal cell by adding the first LTE cell to a blacklist corresponding to the call; the determining module is specifically configured to determine that the first LTE cell is an abnormal cell when it is detected that the first LTE cell is a cell in the blacklist.

Optionally, the marking module is specifically configured to mark the first LTE cell as an abnormal cell in the second period; the first LTE cell is also used for canceling the marking processing of the first LTE cell as an abnormal cell after the second period; wherein the second period is subsequent to the first period.

Optionally, the release DRB event comprises at least one of: releasing DRB in the call establishment process corresponding to the call; and releasing the DRB in the VoLTE call establishment process of the LTE voice scheme.

Optionally, the switching module 402 is further configured to, after receiving a redirection message sent by the network device according to the service request, switch from the NR cell to the first LTE cell and switch from the first LTE cell to the 3G cell when the normal LTE cell is not detected and the 3G cell is detected, so that the call is connected; and under the condition that the normal LTE cell is not detected, the 3G cell is not detected, and the 2G cell is detected, switching to the first LTE cell from the NR cell and switching to the 2G cell from the first LTE cell so as to enable the call to be connected.

Optionally, the switching module 402 is further configured to, after receiving the redirection message sent by the network device according to the service request, switch from the NR cell to the first LTE cell to enable the call to be connected if the first LTE cell is not an abnormal cell.

In the embodiment of the present application, each module may implement the call processing method provided in the foregoing method embodiment, and may achieve the same technical effect, and for avoiding repetition, details are not described here again.

Fig. 5 is a schematic diagram of a hardware structure of a terminal device for implementing various embodiments of the present application, as shown in fig. 5, the terminal device includes, but is not limited to: a Radio Frequency (RF) circuit 501, a memory 502, an input unit 503, a display unit 504, a sensor 505, an audio circuit 506, a wireless fidelity (WiFi) module 507, a processor 508, a power supply 509, and a camera 510. The radio frequency circuit 501 includes a receiver 5011 and a transmitter 5012. Those skilled in the art will appreciate that the terminal device configuration shown in fig. 5 is not limiting and may include more or fewer components than shown, or some components may be combined, or a different arrangement of components.

The RF circuit 501 may be used for receiving and transmitting signals during a message transmission or call, and in particular, receives downlink information of a base station and then processes the downlink information to the processor 508; in addition, data for designing uplink is transmitted to the base station. In general, RF circuit 501 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a Low Noise Amplifier (LNA), a duplexer, and the like. In addition, the RF circuitry 501 may also communicate with networks and other devices via wireless communications. The wireless communication may use any communication standard or protocol, including but not limited to global system for mobile communications (GSM), general Packet Radio Service (GPRS), code Division Multiple Access (CDMA), wideband Code Division Multiple Access (WCDMA), long Term Evolution (LTE), email, short Message Service (SMS), etc.

The memory 502 may be used to store software programs and modules, and the processor 508 executes various functional applications and data processing of the terminal device by operating the software programs and modules stored in the memory 502. The memory 502 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for 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 terminal device, and the like. Further, the memory 502 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 input unit 503 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 input unit 503 may include a touch panel 5031 and other input devices 5032. The touch panel 5031, also called a touch screen, can collect a touch operation performed by a user on or near the touch panel 5031 (e.g., an operation performed by the user on or near the touch panel 5031 by using any suitable object or accessory such as a finger or a stylus pen), and drive a corresponding connection device according to a preset program. Alternatively, the touch panel 5031 may include two parts, that is, 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 508, and can receive and execute commands sent by the processor 508. In addition, the touch panel 5031 can be implemented by using various types such as a resistive type, a capacitive type, an infrared ray, and a surface acoustic wave. The input unit 503 may include other input devices 5032 in addition to the touch panel 5031. In particular, other input devices 5032 can include, but are not limited to, one or more of a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and the like.

The display unit 504 may be used to display information input by the user or information provided to the user and various menus of the terminal device. The display unit 504 may include a display panel 5041, and optionally, the display panel 5041 may be configured in the form of a Liquid Crystal Display (LCD), an organic light-Emitting diode (OLED), or the like. Further, the touch panel 5031 can cover the display panel 5041, and when the touch panel 5031 detects a touch operation on or near the touch panel, the touch operation is transmitted to the processor 508 to determine a touch event, and then the processor 508 provides a corresponding visual output on the display panel 5041 according to the touch event. Although in fig. 5, the touch panel 5031 and the display panel 5041 are two independent components to implement the input and output functions of the terminal device, in some embodiments, the touch panel 5031 and the display panel 5041 may be integrated to implement the input and output functions of the terminal device.

The terminal device may also include at least one sensor 505, such as light sensors, motion sensors, and other sensors. Specifically, the light sensor may include an ambient light sensor that may adjust the brightness of the display panel 5041 according to the brightness of ambient light, and a proximity sensor that may exit the display panel 5041 and/or backlight when the terminal device 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 for applications (such as horizontal and vertical screen switching, related games, magnetometer attitude calibration) for recognizing the attitude of the terminal device, and related functions (such as pedometer and tapping) for vibration recognition; as for other sensors such as a gyroscope, a geomagnetic sensor, a barometer, a hygrometer, a thermometer, and an infrared sensor, which can be configured in the terminal device, further description is omitted here. In the embodiment of the present application, the terminal device may include an acceleration sensor, a depth sensor, a distance sensor, or the like.

Audio circuitry 506, speaker 5061, and microphone 5062 may provide an audio interface between the user and the terminal device. The audio circuit 506 may transmit the electrical signal converted from the received audio data to the speaker 5061, and convert the electrical signal into an audio signal by the speaker 5061 and output the audio signal; on the other hand, the microphone 5062 converts the collected sound signal into an electric signal, which is received by the audio circuit 506 and converted into audio data, and then the audio data is processed by the audio data output processor 508, and then sent to another terminal device through the RF circuit 501, or the audio data is output to the memory 502 for further processing.

WiFi belongs to short-distance wireless transmission technology, and terminal equipment can help a user to receive and send e-mails, browse webpages, access streaming media and the like through a WiFi module 507, and provides wireless broadband internet access for the user. Although fig. 5 shows the WiFi module 507, it is understood that it does not belong to the essential constitution of the terminal device, and may be omitted entirely as needed within the scope not changing the essence of the invention.

The processor 508 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 running or executing software programs and/or modules stored in the memory 502 and calling data stored in the memory 502, thereby integrally monitoring the terminal device. Alternatively, processor 508 may include one or more processing units; preferably, the processor 508 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 508.

The terminal device also includes a power supply 509 (e.g., a battery) for powering the various components, which may preferably be logically coupled to the processor 508 via a power management system to manage charging, discharging, and power consumption management functions via the power management system. Although not shown, the terminal device may further include a bluetooth module, etc., which will not be described herein.

In this embodiment of the present application, the receiver 5011 is configured to receive a redirection message sent by a network device according to a service request after the terminal device initiates the service request of a call based on an evolved packet system fallback, where the redirection message is used to instruct the terminal device to redirect from a new air interface NR cell to a first long term evolution LTE cell; a processor 508, configured to, when the first LTE cell is an abnormal cell and a normal second LTE cell is detected, switch from the NR cell to the second LTE cell so that the call is connected; the abnormal cell is a cell in which the frequency of the DRB releasing event is greater than or equal to a frequency threshold.

Optionally, the processor 508 is further configured to, before receiving a redirection message sent by the network device according to the service request, mark the first LTE cell as an abnormal cell when detecting that the number of times of the DRB release event occurring in the first LTE cell in the first period is greater than or equal to the number threshold; and after receiving a redirection message sent by the network device according to the service request, determining that the first LTE cell is an abnormal cell when detecting that the first LTE cell is marked as an abnormal cell.

Optionally, the processor 508 is specifically configured to mark the first LTE cell as an abnormal cell by setting the priority of the first LTE cell as the lowest priority corresponding to the call; and under the condition that the priority of the first LTE cell is detected to be the lowest priority, determining that the first LTE cell is an abnormal cell.

Optionally, the processor 508 is specifically configured to mark the first LTE cell as an abnormal cell by adding the first LTE cell to a blacklist corresponding to the call; and under the condition that the first LTE cell is detected to be the cell in the blacklist, determining that the first LTE cell is an abnormal cell.

Optionally, the processor 508 is specifically configured to mark the first LTE cell as an abnormal cell in the second period; the first LTE cell is also used for canceling the marking processing of the first LTE cell as an abnormal cell after the second period; wherein the second period is subsequent to the first period.

Optionally, the processor 508 is further configured to, after receiving the redirection message sent by the network device according to the service request, if the normal LTE cell is not detected and the 3G cell is detected, handover from the NR cell to the first LTE cell and handover from the first LTE cell to the 3G cell, so that the call is connected; and under the condition that the normal LTE cell is not detected, the 3G cell is not detected, and the 2G cell is detected, switching to the first LTE cell from the NR cell and switching to the 2G cell from the first LTE cell so as to enable the call to be connected.

Optionally, the processor 508 is further configured to, after receiving the redirection message sent by the network device according to the service request, in case that the first LTE cell is not an abnormal cell, switch from the NR cell to the first LTE cell so as to make the call connect.

The beneficial effects of the various implementation manners in this embodiment may specifically refer to the beneficial effects of the corresponding implementation manners in the foregoing call processing method embodiment, and are not described herein again to avoid repetition.

An embodiment of the present application further provides a terminal device, where the terminal device may include: a memory storing executable program code; and a processor and transceiver coupled to the memory; the processor calls the executable program code stored in the memory, and when the executable program code is executed by the processor, the processor and the transceiver realize each process of the call processing method provided by the above method embodiment, and can achieve the same technical effect, and in order to avoid repetition, the description is omitted here.

Embodiments of the present application provide a readable storage medium, where a program or an instruction is stored, and when the program or the instruction is executed by a processor, the program or the instruction implements each process of the call processing method provided in the foregoing method embodiments, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here.

An embodiment of the present application further provides a computer program product, where the computer program product includes a computer instruction, and when the computer program product runs on a processor, the processor is enabled to execute the computer instruction, so as to implement each process of the call processing method provided in the foregoing method embodiment, and achieve the same technical effect, and in order to avoid repetition, details are not repeated here.

The embodiment of the present application further provides a chip, where the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is configured to execute a program or an instruction to implement each process of the above-mentioned call processing method embodiment, and can achieve the same technical effect, and is not described here again to avoid repetition.

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

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus, server and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit may be implemented in the form of hardware, or may also be implemented in the form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims

1. A call processing method is applied to a terminal device, and the method comprises the following steps:

under the condition that the frequency of DRB releasing events occurring in a first LTE cell in a first period is detected to be larger than or equal to a frequency threshold value, marking the first LTE cell as an abnormal cell;

after the terminal equipment initiates a service request of a call based on fallback of an evolved packet system, receiving a redirection message sent by network equipment according to the service request, wherein the redirection message is used for indicating the terminal equipment to redirect to the first LTE cell from a new air interface NR cell;

under the condition that the first LTE cell is detected to be marked as the abnormal cell, determining that the first LTE cell is the abnormal cell;

switching from the NR cell to a second LTE cell to enable the call to be connected when the first LTE cell is the abnormal cell and the second LTE cell is detected to be normal;

the marking of the first LTE cell as an abnormal cell comprises: marking the first LTE cell as the abnormal cell at a second period, the second period being after the first period;

the method further comprises the following steps: canceling the marking of the first LTE cell as the abnormal cell after the second period.

2. The method of claim 1, wherein the marking the first LTE cell as an abnormal cell further comprises:

marking the first LTE cell as the abnormal cell by setting the priority of the first LTE cell as the lowest priority corresponding to the call;

the determining that the first LTE cell is the abnormal cell under the condition that the first LTE cell is detected to be marked as the abnormal cell comprises the following steps:

and determining the first LTE cell as the abnormal cell under the condition that the priority of the first LTE cell is detected to be the lowest priority.

3. The method of claim 1, wherein the marking the first LTE cell as an abnormal cell further comprises:

marking the first LTE cell as the abnormal cell by adding the first LTE cell into a blacklist corresponding to the call;

the determining that the first LTE cell is the abnormal cell under the condition that the first LTE cell is detected to be marked as the abnormal cell comprises:

determining that the first LTE cell is the abnormal cell when detecting that the first LTE cell is the cell in the blacklist.

4. The method of any of claims 1 to 3, wherein the release DRB event comprises at least one of:

releasing the DRB in the call establishment process corresponding to the call;

and releasing the DRB in the VoLTE call establishment process of the LTE voice scheme.

5. The method according to any of claims 1 to 3, wherein after receiving a redirection message sent by a network device according to the service request, the method further comprises:

under the condition that a normal LTE cell is not detected and a 3G cell is detected, switching from the NR cell to the first LTE cell and switching from the first LTE cell to the 3G cell so as to enable the call to be connected;

and under the condition that a normal LTE cell is not detected, a 3G cell is not detected, and a 2G cell is detected, switching to the first LTE cell from the NR cell and switching to the 2G cell from the first LTE cell so as to enable the call to be connected.

6. The method according to any of claims 1 to 3, wherein after receiving a redirection message sent by a network device according to the service request, the method further comprises:

switching from the NR cell to the first LTE cell to cause the call to be connected if the first LTE cell is not the abnormal cell.

7. A call processing apparatus, characterized in that the apparatus comprises: the device comprises a marking module, a receiving module, a determining module and a switching module;

the marking module is used for marking the first LTE cell as an abnormal cell when the frequency of DRB releasing events occurring in the first LTE cell in a first period is detected to be larger than or equal to a frequency threshold value;

the receiving module is configured to receive a redirection message sent by a network device according to a service request after a terminal device initiates the service request of a call based on an evolved packet system fallback, where the redirection message is used to instruct the terminal device to redirect to a first LTE cell from a new air interface NR cell;

the determining module is configured to determine that the first LTE cell is the abnormal cell when it is detected that the first LTE cell is marked as the abnormal cell;

the handover module is configured to handover from the NR cell to a second LTE cell to enable the call to be connected when the first LTE cell is the abnormal cell and a normal second LTE cell is detected;

the marking module is specifically configured to mark the first LTE cell as the abnormal cell at a second period, and cancel the marking of the first LTE cell as the abnormal cell after the second period, where the second period is after the first period.

8. A terminal device, comprising:

a memory storing executable program code;

and a processor and transceiver coupled to the memory;

the processor calls the executable program code stored in the memory, which when executed by the processor causes the processor and transceiver to implement the steps of the call processing method as claimed in any one of claims 1 to 6.

9. A readable storage medium, on which a program or instructions are stored, which, when executed by a processor, carry out the steps of the call processing method according to any one of claims 1 to 6.