CN115550858B - Voice call fallback method, device and storage medium - Google Patents

Abstract

The embodiment of the present application discloses a voice call fallback method, device and storage medium, wherein the voice service between the network device and the terminal device falls back from the first network to the second network, and during the call establishment process between the network device and the terminal device, the terminal device periodically sends a first data packet to the network device, which is used to maintain the RRC connection between the terminal device and the network device during the ringing period, so as to realize link keep alive. This method can avoid the problem that the inactivity timer times out due to the lack of data interaction for a long time, the network device discards the RRC resources between the terminal device and the terminal device, releases the RRC connection, and thus causes the call establishment failure.

Description

A voice call fallback method, device and storage medium

This application is a divisional application of Chinese patent application No. 202110599374.X, with an application date of August 27, 2021, and the invention name of “A voice call fallback method, device and storage medium”.

Technical Field

The present application relates to communication technology, and more particularly to a voice call fallback method, device and storage medium.

Background Art

At present, voice call fallback technologies include: Circuit Switched Fallback (CSFB) technology and Evolved Packet System fallback (EPSfallback) technology. CSFB is when the terminal device cooperates with the network device to fall back from the LTE network to the 2G/3G network during a voice call, and EPS fallback is when the terminal device cooperates with the network device to fall back from the 5G network to the LTE network during a voice call.

However, the current voice call fallback technology has the problem of disconnection of the voice call connection between the network device and the terminal device (including the calling terminal and the called terminal) after the fallback, which seriously affects the voice call quality of the terminal device.

Summary of the invention

In order to solve the above technical problems, the embodiments of the present application hope to provide a voice call fallback method, device and storage medium.

The technical solution of this application is implemented as follows:

In a first aspect, a voice call fallback method is provided, which is applied to a terminal device, and the method includes:

When the voice service of the terminal device falls back from the first network to the second network, receiving a first voice call message on the second network;

performing a ringing operation in response to the first voice call message;

During the ringing period, a first data packet is periodically sent to the network device based on a preset time interval to maintain a radio resource control (RRC) connection with the network device.

In a second aspect, a voice call fallback method is provided, which is applied to a network device, and the method includes:

When the voice service of the terminal device falls back from the first network to the second network, the second network sends a first voice call message to the terminal device, so that the terminal device performs a ringing operation in response to the first voice call message;

During the ringing of the terminal device, a first data packet sent by the terminal device is received based on a preset time interval to maintain a radio link control RRC connection with the terminal device.

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

A first processing unit, configured to fall back the voice service of the terminal device from the first network to the second network;

A first communication unit, configured to receive a first voice call message on the second network;

The first processing unit is further configured to perform a ringing operation in response to the first voice call message;

The first communication unit is further configured to periodically send a first data packet to the network device based on a preset time interval during the ringing period, so as to maintain a radio link control RRC connection with the network device.

In a fourth aspect, a voice call fallback device is provided, which is applied to a network device, and the device includes:

A second processing unit, configured to fall back the voice service of the terminal device from the first network to the second network;

A second communication unit, configured to send a first voice call message to the terminal device on the second network, so that the terminal device performs a ringing operation in response to the first voice call message;

The second communication unit is also used to receive a first data packet sent by the terminal device based on a preset time interval during the ringing period of the terminal device to maintain a radio link control RRC connection with the terminal device.

In a fifth aspect, a voice call fallback device is provided, comprising: a processor and a memory configured to store a computer program that can be run on the processor,

Wherein, the processor is configured to execute the steps of the aforementioned voice call fallback method applied to a terminal device or a network device when running the computer program.

The device may be a terminal device or a chip applied to a terminal device, or the device may be a network device or a chip applied to a network device.

In a sixth aspect, a computer-readable storage medium is provided, on which a computer program is stored, wherein when the computer program is executed by a processor, the steps of the aforementioned fallback method applied to a terminal device or a network device are implemented.

In the embodiment of the present application, a method, device and storage medium for voice call fallback are provided, wherein the voice service between the network device and the terminal device falls back from the first network to the second network, and during the call establishment process between the network device and the terminal device, the terminal device periodically sends a first data packet to the network device, which is used to maintain the RRC connection between the terminal device and the network device during the ringing period, thereby realizing link keep alive. This method can avoid the problem of call establishment failure caused by the inactivity timer timing out due to the lack of data interaction for a long time, the network device discarding the RRC resources between the terminal device and the terminal device, and releasing the RRC connection.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the structure of a communication system in an embodiment of the present application;

FIG2 is a schematic diagram of a first flow chart of a method for voice call fallback in an embodiment of the present application;

FIG3 is a schematic diagram of a second flow chart of the method for voice call fallback in an embodiment of the present application;

FIG4 is a schematic diagram of a third flow chart of the voice call fallback method in an embodiment of the present application;

FIG5 is a schematic diagram of a fourth flow chart of a method for voice call fallback in an embodiment of the present application;

FIG6 is a fifth flow chart of the method for voice call fallback in an embodiment of the present application;

FIG7 is a sixth flow chart of the voice call fallback method in an embodiment of the present application;

FIG8 is a schematic diagram of a first component structure of a voice call fallback device in an embodiment of the present application;

FIG9 is a schematic diagram of a second component structure of the voice call fallback device in an embodiment of the present application;

FIG. 10 is a schematic diagram of a third component structure of the voice call fallback device in an embodiment of the present application.

DETAILED DESCRIPTION

In order to enable a more detailed understanding of the features and technical contents of the embodiments of the present application, the implementation of the embodiments of the present application is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present application.

Exemplarily, the communication system 100 used in the embodiment of the present application may be as shown in FIG1. The communication system 100 may include a network device 110, which may be a device that communicates with a terminal device 120 (or referred to as a communication terminal or terminal). The network device 110 may provide communication coverage for a specific geographical area, and may communicate with a terminal device 120 located in the coverage area. Optionally, the network device 110 may be a network device (Base Transceiver Station, BTS) in a GSM system or a CDMA system, or a network device (NodeB, NB) in a WCDMA system, or an evolved network device (Evolutional Node B, eNB or eNodeB) in an LTE system, or a wireless controller in a cloud radio access network (Cloud Radio Access Network, CRAN), or the network device may be a mobile switching center, a relay station, an access point, a vehicle-mounted device, a wearable device, a hub, a switch, a bridge, a router, a network side device in a 5G network, or a network device in a future evolved public land mobile network (Public Land Mobile Network, PLMN), etc.

The communication system 100 also includes at least one terminal device 120 located within the coverage of the network device 110. As used herein, a "terminal device" is a terminal device that is configured to communicate via a wireless interface, which may be referred to as a "wireless communication terminal", "wireless terminal" or "mobile terminal". Examples of mobile terminals include, but are not limited to, satellite or cellular phones; Personal Communications System (PCS) terminals that may combine cellular radiotelephones with data processing, fax and data communication capabilities; Personal Digital Assistants (PDAs) that may include radiotelephones, pagers, Internet/Intranet access, Web browsers, notepads, calendars and/or Global Positioning System (GPS) receivers; and conventional laptop and/or palmtop receivers or other electronic devices that include radiotelephone transceivers. The terminal device 120 may refer to an access terminal, user equipment (UE), a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent or a user device. The access terminal can be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a PDA, a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, or a wearable device. Here, the terminal device can be a 5G terminal device supporting non-standalone (NSA) networking or a 5G terminal device supporting standalone (SA) networking. In a voice call, the terminal device includes a calling terminal and a called terminal.

However, in the current voice call fallback technology, there is a problem that the voice call connection between the network device and the terminal device (including the calling terminal and the called terminal) is disconnected during the ringing period of the terminal device after the fallback.

For example, the coverage of 5G networks cannot yet reach the coverage level of 4G LTE networks. 5G networks are mainly covered in hot spots to provide fast Internet access for terminal devices such as mobile phones and computers. For 5G voice services, since most of the existing operators do not support VoNR and still rely on traditional VoLTE to provide voice services, 3GPP has proposed an EPS fallback voice solution for terminals that do not support VoNR. Simply put, when performing voice services on the 5G network, the terminal equipment cooperates with the network equipment to fall back to the LTE network for VoLTE voice services.

However, the existing EPS fallback voice solution has the problem of abnormal release of RRC connection by network equipment and disconnection of voice call, which seriously affects the voice service experience of 5G terminals. The embodiment of the present application mainly aims at the problem of abnormal release of RRC connection between network equipment and terminal equipment (including calling terminal and called terminal) during a voice call, and provides a voice call fallback method. The specific implementation steps of the method are described in detail below.

The present application embodiment provides a voice call fallback method, which is applied to a terminal device. FIG2 is a schematic diagram of a first process of the voice call fallback method in the present application embodiment. As shown in FIG2, the method may specifically include:

Step 201: When the voice service of the terminal device falls back from the first network to the second network, a first voice call message is received on the second network;

Exemplarily, this step may specifically include: when the terminal device accesses the first network, determining that a fallback condition is met, and falling back the voice service of the terminal device from the first network to the second network.

Exemplarily, the fallback conditions include: the terminal device does not support the voice service of the first network, or the network device does not support the voice service of the first network.

That is, when the terminal device resides in the first network, when the network device determines that the fallback condition is met, it performs a fallback operation, and the terminal device and the network device continue to establish a voice call connection on the second network.

Exemplarily, when the first network is a 5G network, the second network is an LTE network; when the first network is an LTE network, the second network is a 2G/3G network.

Step 202: performing a ringing operation in response to the first voice call message;

Step 203: During the ringing period, periodically send a first data packet to the network device based on a preset time interval to maintain a radio link control RRC connection with the network device.

Exemplarily, in some embodiments, the data length of the first data packet is smaller than a data length threshold; and the time interval is smaller than a time interval threshold.

Here, the data length threshold is to limit the data length of the first data packet. The first data packet can be understood as a data packet of fixed size and small length for link keep-alive purposes. The content of the data packet has no actual meaning, so that data interaction with network devices can be achieved without occupying too many uplink resources. Exemplarily, the data length of the first data packet is several or more than ten bytes, and the first data packet can be an empty data packet with no actual meaning.

The time interval threshold is the time interval for limiting the transmission. If the time interval is too large, the link cannot be kept alive, and if it is too small, too many uplink resources will be occupied. For example, the time interval is 2s, 3s, 4s, or 5s. Preferably, the time interval is 3s.

Exemplarily, in some embodiments, the method further includes: detecting an off-hook operation, establishing a voice connection with a network device and stopping sending the first data packet to the network device.

It should be noted that after the terminal device picks up the phone, because the two parties start to interact with voice data, the voice data sending interval is 20ms. During the voice data interaction, the terminal device and the network device frequently interact with data. The network device will not release the RRC connection due to the expiration of the inactivity timer. Therefore, the terminal device can stop sending the first data packet to the network device to save uplink resources.

Since the existing fallback scheme has the problem of abnormal release of the RRC connection by the network device, especially after falling back to the second network, during the ringing period of the terminal device (including the calling terminal and the called terminal), since there is no data interaction between the terminal device and the network device during this period, it is easy to cause the inactivity timer on the base station side to time out and then cause the RRC connection to be released. Therefore, during the ringing period, the embodiment of the present application enables the terminal device to periodically send a first data packet to the network device to achieve data interaction with the network device, so as to avoid the inactivity timer timeout due to no data interaction for a long time, and the network device discards the RRC resources between the terminal device and the terminal device, and releases the RRC connection.

The following takes the terminal device as the called terminal, the first network as the 5G network, and the second network as the LTE network as an example to further illustrate the voice call fallback method in the embodiment of the present application, which may also be referred to as the EPS fallback method. FIG. 3 is a first flow chart of the voice call fallback method in the embodiment of the present application. As shown in FIG. 3, the method includes:

Step 301: When the voice service of the called terminal falls back from the 5G network to the LTE network, a first voice call message is received on the LTE network;

Exemplarily, this step may specifically include: when the EPS fallback condition is met, the network device falls back the voice service of the called terminal from the 5G network to the LTE network.

Exemplarily, EPS fallback conditions include: the called terminal does not support 5G voice services, or the network equipment does not support 5G voice services.

That is to say, when the terminal device resides in the 5G network, when the network device determines that the EPS fallback conditions are met, it performs the fallback operation, and the called terminal and the network device continue to establish a voice call connection on the LTE network.

Step 302: performing a ringing operation in response to the first voice call message;

Step 303: During the ringing period, periodically send a first data packet to the network device based on a preset time interval to maintain the RRC connection with the network device.

Exemplarily, in some embodiments, the data length of the first data packet is smaller than a data length threshold; and the time interval is smaller than a time interval threshold.

Exemplarily, in some embodiments, the method further includes: detecting an off-hook operation, establishing a voice connection with a network device and stopping sending the first data packet to the network device.

It should be noted that after the terminal device picks up the phone, because the two parties start to interact with voice data, the voice data sending interval is 20ms. During the voice data interaction, the terminal device and the network device frequently interact with data. The network device will not release the RRC connection due to the expiration of the inactivity timer. Therefore, the terminal device can stop sending the first data packet to the network device to save uplink resources.

It should be noted that in the EPS Fallback voice solution, there is an abnormal release of the RRC connection by the network side device, especially after falling back to the LTE network, during the ringing period of the called terminal, since there is no data interaction between the called terminal and the network device during this period, it is easy to cause the inactivity timer on the base station side to time out and then cause the RRC connection to be released. Therefore, during the ringing period, the embodiment of the present application enables the called terminal to periodically send the first data packet to the network device to realize data interaction with the network device, so as to avoid the inactivity timer timeout due to no data interaction for a long time, and the network device discards the RRC resources between the called terminal and the called terminal, and releases the RRC connection.

In order to better reflect the purpose of the present application, further examples are given based on the above embodiments of the present application. As shown in FIG4 , the method specifically includes:

Step 401: When the voice service of the called terminal falls back from the 5G network to the LTE network, a first voice call message is received on the LTE network;

Exemplarily, this step may specifically include: when the EPS fallback condition is met, the network device falls back the voice service of the called terminal from the 5G network to the LTE network.

Exemplarily, EPS fallback conditions include: the called terminal does not support 5G voice services, or the network equipment does not support 5G voice services.

That is to say, when the terminal device resides in the 5G network, when the network device determines that the EPS fallback conditions are met, it performs the fallback operation, and the called terminal and the network device continue to establish a voice call connection on the LTE network.

Exemplarily, this step may specifically include: receiving a second voice call message sent by the network device in the 5G network; in response to the second voice call message, determining that the called terminal does not support 5G voice service, and sending a network status message to the network device, so that the network device determines that the called terminal does not support the voice service of the 5G network based on the network status message.

Here, the second voice call message can be a part of the voice signaling in the voice service, such as a call request. When the called terminal resides in the 5G network, a part of the voice signaling is first transmitted through the 5G network. If it is determined that the terminal device does not support the 5G voice service, the 5G network will fall back to the LTE network, and the LTE network will continue to transmit another part of the voice signaling of the voice service (referred to as the "first voice call message" in the embodiment of the present application). A voice connection is established between the network device and the called terminal through the second voice call message and the first voice call message.

In actual applications, when the called terminal resides on the 5G network, if the network device detects a voice service for the called terminal, the network device first sends a second voice call message to the called terminal through the 5G network.

It can be understood that after receiving the second voice call message, the called terminal determines whether it supports the 5G voice service. If it does not support, it sends a network status message to the network device to inform the network device. If it supports, it can also send a network status message to the network device to inform the network device.

In actual applications, the network equipment can also know in advance whether the called terminal supports 5G voice services. However, since the called terminal is currently residing in the 5G network, it is still necessary to send a second voice call message through the 5G network to implement part of the voice signaling interaction on the 5G network, and then fall back the voice service of the called terminal from the 5G network to the LTE network, and continue to implement another part of the voice signaling interaction on the LTE network.

Step 402: performing a ringing operation in response to the first voice call message;

Step 403: During the ringing period, periodically send a first data packet to the network device based on a preset time interval to maintain an RRC connection with the network device;

Exemplarily, in some embodiments, the data length of the first data packet is smaller than a data length threshold; and the time interval is smaller than a time interval threshold.

Step 404: Determine whether an off-hook operation is detected. If yes, execute step 405; if no, continue to execute step 403;

In practical applications, the method further includes: if the ringing time is greater than the ringing time threshold, stopping the ringing and stopping sending the first data packet to the network device. It can be understood that if the called terminal does not perform an off-hook operation for a long time, the call is determined to have failed and the call is stopped.

Step 405: An off-hook operation is detected, a voice connection is established with the network device, and sending the first data packet to the network device is stopped.

It should be noted that after the called terminal picks up the phone, because the two parties start to interact with voice data, the voice data sending interval is 20ms. During the voice data interaction, the terminal device and the network device frequently interact with data. The network device will not release the RRC connection due to the expiration of the inactivity timer. Therefore, the called terminal can stop sending the first data packet to the network device to save uplink resources.

The embodiment of the present application also provides another voice call fallback method, which is applied to a network device, and the network device is the network device 110 in Figure 1. Figure 5 is a fourth flow chart of the voice call fallback method in the embodiment of the present application. As shown in Figure 5, the method includes:

Step 501: When the voice service of the terminal device falls back from the first network to the second network, the second network sends a first voice call message to the terminal device, so that the terminal device performs a ringing operation in response to the first voice call message;

Exemplarily, this step may specifically include: when the terminal device accesses the first network, determining that a fallback condition is met, and falling back the voice service of the terminal device from the first network to the second network.

Exemplarily, the fallback conditions include: the terminal device does not support the voice service of the first network, or the network device does not support the voice service of the first network.

That is, when the terminal device resides in the first network, when the network device determines that the fallback condition is met, it performs a fallback operation, and the terminal device and the network device continue to establish a voice call connection on the second network.

Exemplarily, when the first network is a 5G network, the second network is an LTE network; when the first network is an LTE network, the second network is a 2G/3G network.

Step 502: During the ringing period of the terminal device, a first data packet sent by the terminal device is received based on a preset time interval to maintain an RRC connection with the terminal device.

Exemplarily, in some embodiments, the data length of the first data packet is smaller than a data length threshold; and the time interval is smaller than a time interval threshold.

Here, the data length threshold is used to limit the data length of the first data packet. The first data packet can be understood as a data packet of fixed size and small length for link keep-alive purposes. The content of the data packet has no actual meaning, so that data interaction with network devices can be achieved without occupying too many uplink resources. Exemplarily, the data length of the first data packet is several or more than ten bytes, and the first data packet can be an empty data packet with no actual meaning.

The time interval threshold is the time interval for limiting the transmission. If the time interval is too large, the link cannot be kept alive, and if it is too small, too many uplink resources will be occupied. For example, the time interval is 2s, 3s, 4s, or 5s. Preferably, the time interval is 3s.

Exemplarily, in some embodiments, the method further includes: determining that the terminal device performs an off-hook operation, establishing a voice connection with the terminal device and stopping receiving the first data packet sent by the terminal device.

Since the existing fallback scheme has the problem of abnormal release of the RRC connection by the network device, especially after falling back to the second network, during the ringing period of the terminal device (including the calling terminal and the called terminal), since there is no data interaction between the terminal device and the network device during this period, it is easy to cause the inactivity timer on the base station side to time out and then cause the RRC connection to be released. Therefore, during the ringing period, the embodiment of the present application enables the terminal device to periodically send a first data packet to the network device to achieve data interaction with the network device, so as to avoid the inactivity timer timeout due to no data interaction for a long time, and the network device discards the RRC resources between the terminal device and the terminal device, and releases the RRC connection.

Below, taking the terminal device as the called terminal, the first network as the 5G network, and the second network as the LTE network as an example, the voice call fallback method in the embodiment of the present application is further illustrated. Figure 6 is a fifth flow chart of the voice call fallback method in the embodiment of the present application.

Step 601: Falling back the voice service of the called terminal from the 5G network to the LTE network;

Exemplarily, this step may specifically include: when the EPS fallback condition is met, the network device falls back the voice service of the called terminal from the 5G network to the LTE network.

Exemplarily, EPS fallback conditions include: the called terminal does not support 5G voice services, or the network equipment does not support 5G voice services.

Specifically, a voice service for the called terminal is detected, it is determined that the network device does not support the voice service of the 5G network, and the voice service of the called terminal is dropped from the 5G network to the LTE network;

Alternatively, a voice service for the called terminal is detected, and it is determined that the called terminal does not support the voice service of the 5G network, and the voice service of the called terminal is fallen back from the 5G network to the LTE network.

Exemplarily, in some embodiments, determining that the called terminal does not support the voice service of the 5G network includes: sending a second voice call message to the called terminal on the 5G network, so that the called terminal responds to the second voice call message, determines that the called terminal does not support the 5G voice service, and sends a network status message to the network device; receives the network status message; and determines, based on the network status message, that the called terminal does not support the 5G voice service.

It can be understood that after receiving the second voice call message, the called terminal determines whether it supports the 5G voice service. If it does not support, it sends a network status message to the network device to inform the network device. If it supports, it can also send a network status message to the network device to inform the network device.

In actual applications, network equipment can also know in advance whether the called terminal supports 5G voice services. However, since the called terminal is currently residing on the 5G network, it is still necessary to send a second voice call message through the 5G network, implement a portion of voice signaling interaction on the 5G network, and then fall back the voice service of the called terminal from the 5G network to the LTE network, and continue to implement another portion of voice signaling interaction on the LTE network.

In actual applications, if the network equipment determines that it does not support 5G voice services, since the called terminal is currently residing in the 5G network, it is still necessary to send a second voice call message through the 5G network to implement part of the voice signaling interaction on the 5G network, and then fall back the voice service of the called terminal from the 5G network to the LTE network, and continue to implement another part of the voice signaling interaction on the LTE network.

Step 602: Sending a first voice call message to the called terminal in the LTE network, so that the called terminal performs a ringing operation in response to the first voice call message;

Step 603: During the ringing of the called terminal, a first data packet sent by the called terminal is received based on a preset time interval to maintain the RRC connection with the called terminal.

Exemplarily, in some embodiments, the data length of the first data packet is smaller than a data length threshold; and the time interval is smaller than a time interval threshold.

It should be noted that in the EPS Fallback voice solution, there is an abnormal release of the RRC connection by the network side device, especially after falling back to the LTE network, during the ringing period of the called terminal, since there is no data interaction between the called terminal and the network device during this period, it is easy to cause the inactivity timer on the base station side to time out and then cause the RRC connection to be released. Therefore, during the ringing period, the embodiment of the present application enables the called terminal to periodically send the first data packet to the network device to realize data interaction with the network device, so as to avoid the inactivity timer timeout due to no data interaction for a long time, and the network device discards the RRC resources between the called terminal and the called terminal, and releases the RRC connection.

In order to better reflect the purpose of the present application, further examples are given based on the above embodiments of the present application. As shown in FIG7 , the method specifically includes:

Step 701: Falling back the voice service of the called terminal from the 5G network to the LTE network;

Step 702: Sending a first voice call message to the called terminal in the LTE network, so that the called terminal performs a ringing operation in response to the first voice call message;

Step 703: During the ringing of the called terminal, receiving a first data packet sent by the called terminal based on a preset time interval to maintain an RRC connection with the called terminal;

Exemplarily, in some embodiments, the data length of the first data packet is smaller than a data length threshold; and the time interval is smaller than a time interval threshold.

Step 704: determine whether the called terminal performs an off-hook operation; if yes, execute step 705; if no, continue to execute step 703;

In actual application, the method further includes: if the ringing time is greater than the ringing time threshold, stopping the ringing and stopping receiving the first data packet sent by the called terminal. It can be understood that if the called terminal does not perform an off-hook operation for a long time, the call is determined to have failed and the call is stopped.

Step 705: Determine that the called terminal performs an off-hook operation, establish a voice connection with the called terminal, and stop receiving the first data packet sent by the called terminal.

It should be noted that after the called terminal picks up the phone, because the two parties start to interact with voice data, the voice data sending interval is 20ms. During the voice data interaction, the terminal device and the network device frequently interact with data. The network device will not release the RRC connection due to the expiration of the inactivity timer. Therefore, the called terminal can stop sending the first data packet to the network device to save uplink resources.

It should be noted that the EPS fallback method between the calling terminal and the network device can refer to the EPS fallback method between the called terminal and the network device mentioned above. Similarly, the CSFB fallback method between the calling terminal and the called terminal and the network device can refer to the EPS fallback method, and the embodiments of this application will not be repeated one by one.

In order to implement the method of the embodiment of the present application, the embodiment of the present application further provides a voice call fallback device, which is applied to a terminal device. As shown in FIG8 , the device 80 includes:

The first processing unit 801 is used to fall back the voice service of the terminal device from the first network to the second network;

A first communication unit 802 is configured to receive a first voice call message on the second network;

The first processing unit 801 is further configured to perform a ringing operation in response to the first voice call message;

The first communication unit 802 is further configured to periodically send a first data packet to the network device based on a preset time interval during the ringing period to maintain a radio link control RRC connection with the network device.

In some embodiments, the first processing unit 801 is further configured to detect an off-hook operation, control the first communication unit 802 to establish a voice connection with the network device, and stop sending the first data packet to the network device.

In some embodiments, the data length of the first data packet is less than a data length threshold; and the time interval is less than a time interval threshold.

In some embodiments, the first processing unit 801 is configured to, when the terminal device accesses the first network, determine that a fallback condition is met, and fall back the voice service of the terminal device from the first network to the second network;

The fallback condition includes: the terminal device does not support the voice service of the first network, or the network device does not support the voice service of the first network.

In some embodiments, the first communication unit 802 is further configured to receive a second voice call message sent by the network device on the first network;

The first processing unit 801 is further used to determine, in response to the second voice call message, that the terminal device does not support the voice service of the first network device, and control the first communication unit 802 to send a network status message to the network device, so that the network device falls back the voice service of the terminal device from the first network to the second network based on the network status message.

In some embodiments, when the first network is a 5G network, the second network is an LTE network;

When the first network is an LTE network, the second network is a 2G/3G network.

In order to implement the method of the embodiment of the present application, the embodiment of the present application further provides another voice call fallback device, which is applied to a network device. As shown in FIG9 , the device 90 includes:

The second processing unit 901 is used to fall back the voice service of the terminal device from the first network to the second network;

The second communication unit 902 is configured to send a first voice call message to the terminal device in the second network, so that the terminal device performs a ringing operation in response to the first voice call message;

The second communication unit 902 is further used to receive a first data packet sent by the terminal device based on a preset time interval during the ringing period of the terminal device, so as to maintain a radio link control RRC connection with the terminal device.

In some embodiments, the second processing unit 901 is further used to determine that the terminal device performs an off-hook operation, establish a voice connection with the terminal device and stop receiving the first data packet sent by the terminal device.

In some embodiments, the data length of the first data packet is less than a data length threshold; and the time interval is less than a time interval threshold.

In some embodiments, the second processing unit 901 is specifically configured to, when the terminal device accesses the first network, determine that a fallback condition is met, and fall back the voice service of the terminal device from the first network to the second network;

The fallback condition includes: the terminal device does not support the voice service of the first network, or the network device does not support the voice service of the first network.

Specifically, the second processing unit 901 is used to detect the voice service for the terminal device, determine that the network device does not support the voice service of the first network, and fall back the voice service of the terminal device from the first network to the second network; or, detect the voice service for the terminal device, determine that the terminal device does not support the voice service of the first network, and fall back the voice service of the terminal device from the first network to the second network.

In some embodiments, the second communication unit 902 is configured to send a second voice call message to the terminal device on the first network, so that the terminal device determines that the terminal device does not support the voice service of the first network in response to the second voice call message, and sends a network status message to the network device;

The second communication unit 902 is used to receive the network status message;

The second processing unit 901 is used to determine, according to the network status message, that the terminal device does not support the voice service of the first network.

In some embodiments, when the first network is a 5G network, the second network is an LTE network;

When the first network is an LTE network, the second network is a 2G/3G network.

Based on the hardware implementation of each unit in the above device, the embodiment of the present application also provides another voice call fallback device, which can be a terminal device or a chip applied to a terminal device. Alternatively, the device can be a network device or a chip applied to a network device. As shown in FIG10 , the device 100 includes: a processor 1001 and a memory 1002 configured to store a computer program that can be run on the processor;

The processor 1001 is configured to execute the method steps in the aforementioned embodiment when running a computer program.

Of course, in actual application, as shown in FIG10 , the various components in the device 100 are coupled together via a bus system 1003. It is understandable that the bus system 1003 is used to realize the connection and communication between these components. In addition to the data bus, the bus system 1003 also includes a power bus, a control bus, and a status signal bus. However, for the sake of clarity, in FIG10 , various buses are labeled as the bus system 1003.

In practical applications, the processor may be at least one of an application-specific integrated circuit (ASIC), a digital signal processing device (DSPD), a programmable logic device (PLD), a field-programmable gate array (FPGA), a controller, a microcontroller, and a microprocessor. It is understandable that for different devices, the electronic device used to implement the functions of the processor may also be other, and the embodiments of the present application do not specifically limit this.

The above-mentioned memory can be a volatile memory (volatile memory), such as a random access memory (RAM); or a non-volatile memory (non-volatile memory), such as a read-only memory (ROM), a flash memory, a hard disk (HDD) or a solid-state drive (SSD); or a combination of the above-mentioned types of memory, and provide instructions and data to the processor.

In an exemplary embodiment, the embodiment of the present application further provides a computer-readable storage medium, such as a memory including a computer program, and the computer program can be executed by a processor of a terminal device or a network device to complete the steps of the aforementioned method.

An embodiment of the present application also provides a computer program product, including computer program instructions.

Optionally, the computer program product can be applied to the network device in the embodiments of the present application, and the computer program instructions enable the computer to execute the corresponding processes implemented by the network device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

Optionally, the computer program product can be applied to the terminal device in the embodiments of the present application, and the computer program instructions enable the computer to execute the corresponding processes implemented by the terminal device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

The embodiment of the present application also provides a computer program.

Optionally, the computer program can be applied to the network device in the embodiments of the present application. When the computer program runs on a computer, the computer executes the corresponding processes implemented by the network device in the various methods of the embodiments of the present application. For the sake of brevity, they are not described here.

Optionally, the computer program can be applied to the terminal device in the embodiments of the present application. When the computer program runs on the computer, the computer executes the corresponding processes implemented by the terminal device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

It should be understood that the terms used in the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms of "a", "said" and "the" used in the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and/or" used in this article refers to and includes any or all possible combinations of one or more associated listed items. The expressions "having", "may have", "include" and "include", or "may include" and "may include" in this application can be used to indicate the presence of corresponding features (e.g., elements such as numerical values, functions, operations or components), but do not exclude the presence of additional features.

It should be understood that although the terms first, second, third, etc. may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other and are not necessarily used to describe a specific order or sequence. For example, without departing from the scope of the present invention, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information.

The technical solutions described in the embodiments of the present application can be combined arbitrarily without conflict.

In the several embodiments provided in the present application, it should be understood that the disclosed methods, devices and equipment can be implemented in other ways. The embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units; some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

In addition, all functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may be a separate unit, or two or more units may be integrated into one unit; the above-mentioned integrated units may be implemented in the form of hardware or in the form of hardware plus software functional units.

The above description is only a specific implementation mode of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be covered by the protection scope of the present application.

Claims (13)

1. The voice call fallback method is applied to terminal equipment and is characterized by comprising the following steps:

When the voice service of the terminal equipment falls back from a first network to a second network, receiving a first voice call message on the second network; wherein the first network is a 5G network and the second network is an LTE network; or the first network is an LTE network, and the second network is a 2G/3G network;

Performing a ringing operation in response to the first voice call message;

periodically transmitting a first data packet to a network device during ringing based on a preset time interval to maintain a radio link control (RRC) connection with the network device; the first data packet is used for link keep-alive.

2. The method according to claim 1, wherein the method further comprises:

And detecting an off-hook operation, establishing voice connection with the network equipment and stopping sending the first data packet to the network equipment.

3. The method according to claim 1, characterized in that the method comprises:

When the terminal equipment is accessed to the first network, determining that a fallback condition is met, and fallback the voice service of the terminal equipment from the first network to a second network;

Wherein the fall-back condition includes: the terminal device does not support voice services of the first network, or the network device does not support voice services of the first network.

4. A method according to any one of claims 1-3, characterized in that the data length of the first data packet is 1 byte or more and/or 20 bytes or less.

5. A voice call fallback method applied to a network device, the method comprising:

When voice service of terminal equipment falls back from a first network to a second network, sending a first voice call message to the terminal equipment in the second network so that the terminal equipment responds to the first voice call message to execute ringing operation; wherein the first network is a 5G network and the second network is an LTE network; or the first network is an LTE network, and the second network is a 2G/3G network;

During ringing of the terminal equipment, receiving a first data packet sent by the terminal equipment based on a preset time interval so as to maintain a radio link control (RRC) connection with the terminal equipment; the first data packet is used for link keep-alive.

6. The method of claim 5, wherein the method further comprises:

and determining that the terminal equipment executes off-hook operation, establishing voice connection with the terminal equipment and stopping receiving the first data packet sent by the terminal equipment.

7. The method of claim 5, wherein the data length of the first data packet is less than a data length threshold;

The time interval is less than a time interval threshold.

8. The method according to any of claims 5-7, wherein the data length of the first data packet is 1 byte or more and/or 20 bytes or less.

9. The method of any of claims 5-7, wherein the first network is a 5G network and the second network is an LTE network, the method further comprising:

When the terminal equipment resides in the first network, the network equipment detects voice service aiming at the terminal equipment, and the network equipment firstly sends a second voice call message to the terminal equipment through the first network; and if the terminal equipment does not support the voice service of the first network, the first network is dropped back to a second network, and a first voice call message is sent to the terminal equipment in the second network.

10. A voice call fallback apparatus applied to a terminal device, the apparatus comprising:

The first processing unit is used for dropping the voice service of the terminal equipment from the first network to the second network; wherein the first network is a 5G network and the second network is an LTE network; or the first network is an LTE network, and the second network is a 2G/3G network;

A first communication unit for receiving a first voice call message over the second network;

the first processing unit is further configured to perform a ringing operation in response to the first voice call message;

the first communication unit is further configured to periodically send, during ringing, a first data packet to a network device based on a preset time interval, so as to maintain a radio link control RRC connection with the network device.

11. A voice call fallback apparatus applied to a network device, the apparatus comprising:

The second processing unit is used for dropping the voice service of the terminal equipment from the first network to the second network; wherein the first network is a 5G network and the second network is an LTE network; or the first network is an LTE network, and the second network is a 2G/3G network;

A second communication unit configured to send a first voice call message to the terminal device in the second network, so that the terminal device performs a ringing operation in response to the first voice call message;

The second communication unit is further configured to receive, during ringing of the terminal device, a first data packet sent by the terminal device based on a preset time interval, so as to maintain a radio link control RRC connection with the terminal device.

12. A voice call fallback apparatus, the apparatus comprising: a processor and a memory configured to store a computer program capable of running on the processor,

Wherein the processor is configured to perform the steps of the method of any of claims 1 to 9 when the computer program is run.

13. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method according to any one of claims 1 to 9.