Call switching method and device, computer equipment, readable storage medium and program product

Abstract

The invention relates to a call switching method and device, computer equipment, a readable storage medium and a program product. The method comprises the following steps: receiving first indication information sent by a base station, wherein the first indication information represents that the base station refuses a voice dedicated load establishment request; if switching notification information sent by the terminal is received, second indication information is sent to the base station, the switching notification information represents that the terminal initiates switching of the call mode, and the second indication information is used for indicating the base station to release a protocol data unit PDU session; and based on the received error message sent by the base station, establishing a special voice load, so that the terminal completes switching of the call mode through the special voice load. By adopting the method, the reliability in the call process can be improved.

Description

Technical Field

[0001] The present application relates to the field of wireless communication technology, and in particular to a call switching method, device, computer equipment, readable storage medium and program product. Background Art

[0002] Although mobile network coverage is becoming more and more complete, there are inevitably areas with weak mobile signal coverage in urban residential buildings and other areas, which in turn affects the user experience, such as unclear voice calls, dropped calls, etc. The voice service (Voice over WiFi, VoWiFi) provided by the wireless communication technology (Wireless fidelity, WiFi) network is used as a supplement to cellular. The terminal can switch from cellular to VoWiFi in areas with weak cellular coverage or no cellular signal, providing users with a better call experience. When the network signal in the user's area is weak, the base station can realize the switching between the new air interface voice bearer (Voice over New Radio, VoNR) and the long-term evolution voice bearer (Voice over LTE, VoLTE).

[0003] However, when the New Radio (NR) signal is weak, the base station initiates a switch from VoNR to VoLTE. At the same time, the terminal can initiate an instruction to switch from VoNR to VoWiFi. At this time, the base station is performing the enhanced packet system fallback (EPSFallback, EPSFB) process and will not process the session release message, causing the core network to wait for the base station to reply, which may cause call drops and reduce the reliability of the call. Summary of the invention

[0004] Based on this, it is necessary to provide a call switching method, device, computer equipment, readable storage medium and program product that can improve the reliability of user calls in response to the above technical problems.

[0005] In a first aspect, the present application provides a call switching method, which is applied to a core network, and the method includes:

[0006] Receiving first indication information sent by a base station;

[0007] If the switching notification information sent by the terminal is received, sending second indication information to the base station, the switching notification information indicates that the terminal initiates the switching of the call mode, the first indication information indicates that the base station rejects the voice dedicated bearer establishment request, and the second indication information is used to instruct the base station to release the protocol data unit PDU session;

[0008] Based on the received error message sent by the base station, a voice dedicated bearer is established, so that the terminal completes the switching of the conversation mode through the voice dedicated bearer.

[0009] In one of the embodiments, the first indication information is generated by the base station after receiving the voice dedicated bearer establishment request, and the method further includes:

[0010] Receiving a call request of a first conversation mode sent by a terminal;

[0011] A voice dedicated bearer establishment request is sent to the base station.

[0012] In one embodiment, the method further comprises:

[0013] Release the multimedia communication session.

[0014] In one of the embodiments, after the step of establishing a dedicated voice bearer based on the received error message sent by the base station, the method further includes:

[0015] A termination message is sent to the base station, where the termination message is used to instruct the base station to terminate a switching process, where the switching process represents a switching process of a call mode initiated by the base station.

[0016] In one embodiment, the establishing of a dedicated voice bearer based on the received error message sent by the base station includes:

[0017] receiving an error message, wherein the error message indicates that the base station cannot normally release the PDU session;

[0018] A dedicated voice bearer is established through the session management function SMF.

[0019] In one of the embodiments, the switching notification information indicates that the terminal initiates a switch from a first call mode to a second call mode, the first call mode is voice over new air interface (VoNR), and the second call mode is call over wireless local area network (VoWiFi).

[0020] In one of the embodiments, the switching process represents a switching process initiated by the base station from a first call mode to a third call mode, and the third call mode is a voice over long term evolution (VoLTE).

[0021] In a second aspect, the present application provides a call switching method, which is applied to a base station, and the method includes:

[0022] Sending first indication information to the core network, where the first indication information indicates that the base station rejects the voice dedicated bearer establishment request sent by the core network;

[0023] If second indication information sent by the core network is received, an error message is sent to the core network, where the second indication information is used to instruct the base station to release the protocol data unit PDU session.

[0024] In one of the embodiments, the sending the first indication information to the core network includes:

[0025] If a voice dedicated bearer establishment request sent by the core network is received and it is detected that the signal of the first call mode does not meet the preset call conditions, the switching process is triggered and a first indication message is sent to the core network. The switching process represents the switching process of the call mode initiated by the base station.

[0026] In one of the embodiments, the switching process represents a switching process initiated by the base station from a first call mode to a third call mode, the first call mode is voice over new air interface VoNR, and the third call mode is voice over long term evolution VoLTE.

[0027] In one embodiment, the method further comprises:

[0028] A termination message sent by the core network is received, and the switching process is terminated based on the termination message.

[0029] In one of the embodiments, the error message indicates that the base station cannot release the PDU session normally.

[0030] In a third aspect, the present application provides a call switching method, characterized in that it is applied to a terminal, and the method includes:

[0031] Sending switching notification information to the core network, wherein the switching notification information indicates that the terminal initiates a switching of a call mode;

[0032] If the core network establishes a dedicated voice bearer, the call mode is switched through the dedicated voice bearer.

[0033] In one embodiment, the sending the switching notification information to the core network includes:

[0034] If the signal quality value of the first call mode is less than a preset signal quality threshold, and the signal quality value of the second call mode is greater than the preset signal quality threshold, switching notification information is sent to the core network.

[0035] In one embodiment, the method further comprises:

[0036] A call request of the first conversation mode is initiated to the core network.

[0037] In one of the embodiments, the switching notification information indicates that the terminal initiates a switch from a first call mode to a second call mode, the first call mode is voice over new air interface (VoNR), and the second call mode is call over wireless local area network (VoWiFi).

[0038] In a fourth aspect, the present application further provides a call switching device, applied to a core network, the device comprising:

[0039] A receiving module, configured to receive first indication information sent by a base station, wherein the first indication information indicates that the base station rejects a voice dedicated bearer establishment request;

[0040] A first sending module, configured to send second indication information to a base station if a switching notification information sent by a terminal is received, wherein the switching notification information indicates that the terminal initiates a switching of a call mode, and the second indication information is used to instruct the base station to release a protocol data unit PDU session;

[0041] The first switching module is used to establish a voice dedicated bearer based on the received error message sent by the base station, so that the terminal completes the switching of the conversation mode through the voice dedicated bearer.

[0042] In a fifth aspect, the present application provides a call switching device, which is applied to a base station, and the device includes:

[0043] A second sending module is used to send first indication information to the core network, where the first indication information indicates that the base station rejects the voice dedicated bearer establishment request sent by the core network;

[0044] The third sending module is used to send an error message to the core network if second indication information sent by the core network is received, and the second indication information is used to instruct the base station to release the protocol data unit PDU session.

[0045] In a sixth aspect, the present application provides a call switching device, applied to a terminal, the device comprising:

[0046] A fourth sending module, configured to send switching notification information to the core network, wherein the switching notification information indicates that the terminal initiates a switching of a call mode;

[0047] The second switching module is used to complete the switching of the call mode through the voice dedicated bearer if the core network establishes a voice dedicated bearer.

[0048] In a seventh aspect, the present application further provides a computer device, comprising a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the following steps are implemented:

[0049] receiving first indication information sent by a base station, where the first indication information indicates that the base station rejects a voice dedicated bearer establishment request;

[0050] If the switching notification information sent by the terminal is received, second indication information is sent to the base station, where the switching notification information indicates that the terminal initiates the switching of the call mode, and the second indication information is used to instruct the base station to release the protocol data unit PDU session;

[0051] Based on the received error message sent by the base station, a voice dedicated bearer is established, so that the terminal completes the switching of the conversation mode through the voice dedicated bearer.

[0052] In an eighth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the following steps are implemented:

[0053] receiving first indication information sent by a base station, where the first indication information indicates that the base station rejects a voice dedicated bearer establishment request;

[0054] If the switching notification information sent by the terminal is received, second indication information is sent to the base station, where the switching notification information indicates that the terminal initiates the switching of the call mode, and the second indication information is used to instruct the base station to release the protocol data unit PDU session;

[0055] Based on the received error message sent by the base station, a voice dedicated bearer is established, so that the terminal completes the switching of the conversation mode through the voice dedicated bearer.

[0056] In a ninth aspect, the present application further provides a computer program product, including a computer program, which implements the following steps when executed by a processor:

[0057] receiving first indication information sent by a base station, where the first indication information indicates that the base station rejects a voice dedicated bearer establishment request;

[0058] If the switching notification information sent by the terminal is received, second indication information is sent to the base station, where the switching notification information indicates that the terminal initiates the switching of the call mode, and the second indication information is used to instruct the base station to release the protocol data unit PDU session;

[0059] Based on the received error message sent by the base station, a voice dedicated bearer is established, so that the terminal completes the switching of the conversation mode through the voice dedicated bearer.

[0060] The above-mentioned call switching method, apparatus, computer equipment, readable storage medium and program product receive the first indication information sent by the base station, and if the switching notification information sent by the terminal is received, the second indication information is sent to the base station, and a voice dedicated bearer is established through the received error message sent by the base station. When the base station cannot respond to the second indication information in time, the terminal's call mode can be switched, thereby improving the reliability of the call process and the user's experience during the call. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0062] FIG1 is an application environment diagram of a call switching method according to an embodiment;

[0063] FIG2 is a flow chart of a call switching method in one embodiment;

[0064] FIG3 is a flow chart of a call switching method in one embodiment;

[0065] FIG4 is a flow chart of a call switching method in one embodiment;

[0066] FIG5 is a signaling interaction flow chart of a call switching method in one embodiment;

[0067] FIG6 is a structural block diagram of a call switching device in one embodiment;

[0068] FIG7 is a structural block diagram of a call switching device in one embodiment;

[0069] FIG8 is a structural block diagram of a call switching device in one embodiment;

[0070] FIG. 9 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0071] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0072] A call switching method provided in an embodiment of the present application can be applied in an application environment as shown in FIG1 . In which, a terminal 101 can perform information transmission with a core network 102 . A base station 103 can perform information transmission with the core network 102 .

[0073] Among them, the terminal 101 can be a wireless terminal, which can be a device that provides voice and / or other business data connectivity to users, or a handheld device with wireless connection function, or other processing devices connected to a wireless modem. The wireless terminal can communicate with one or more core networks via a radio access network (Radio Access Network, referred to as RAN). The wireless terminal can be a mobile terminal, such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal, for example, a portable, pocket, handheld, computer-built-in or vehicle-mounted mobile device, which exchanges language and / or data with the radio access network. The wireless terminal can also be called a system, a subscriber unit (Subscriber Unit), a subscriber station (Subscriber Station), a mobile station (Mobile Station), a mobile station (Mobile), a remote station (Remote Station), a remote terminal (Remote Terminal), an access terminal (Access Terminal), a user terminal (User Terminal), a user agent (User Agent), a user device (User Device or User Equipment), which is not limited here.

[0074] The core network 102 may be a 5G core network (5G Core Network, 5GC).

[0075] The base station 103 can be a base station (Base Transceiver Station, BTS) in Global System of Mobile communication (GSM) or Code Division Multiple Access (CDMA), or a base station (NodeB, NB) in Wideband Code Division Multiple Access (WCDMA), or an evolved base station (Evolutional Node B, eNB or eNodeB) in LTE, or a relay station or access point, or a base station in a 5G network, etc., and is not limited here.

[0076] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0077] In an exemplary embodiment, as shown in FIG2 , a call switching method is provided, which is described by taking the method applied to the core network in FIG1 as an example, and includes the following steps:

[0078] Step 201: Receive first indication information sent by a base station.

[0079] The first indication information may indicate that the base station rejects the voice dedicated bearer establishment request, and the voice dedicated bearer may be a dedicated data transmission channel established for voice services. For example, the first indication information may be a reason value #36 (ims_voice_eps_fallback_or_rat_fallback_triggered).

[0080] Specifically, the core network sends a voice dedicated bearer establishment request to the base station based on the call request initiated by the terminal. At this time, the base station detects that the signal of the current call mode is weak, and the base station cannot respond to the voice dedicated bearer establishment request sent by the core network. The core network can receive the first indication information sent by the base station.

[0081] Step 202: If the switching notification information sent by the terminal is received, second indication information is sent to the base station.

[0082] The terminal is a terminal that can support multiple call modes, for example, VoWiFi, VoNR, VoLTE and other call modes. The switching notification information can represent the switching of the call mode initiated by the terminal, and the second indication information can be used to instruct the base station to release the Protocol Data Unit Session (PDU) session. For example, the second indication information can be a PDU session resource release command (PDU SESSION RESOURCE RELEASE COMMAND).

[0083] Specifically, if the terminal detects that the signal quality value of the current call mode does not meet the preset signal quality threshold, the call mode switching is initiated. The core network can receive the switching notification information sent by the terminal. If the core network receives the switching notification information sent by the terminal and receives the first indication information sent by the base station, the second indication information is sent to the base station. The core network can instruct the base station to release the PDU session through the second indication information.

[0084] Optionally, the signal of the current call mode is weak may be that the signal of the current call mode does not meet a preset call condition. Not meeting a preset signal quality threshold may be that the signal quality value is less than or equal to a preset signal threshold.

[0085] Step 203: Based on the received error message sent by the base station, a dedicated voice bearer is established, so that the terminal completes the switching of the call mode through the dedicated voice bearer.

[0086] Specifically, the base station receives the second indication information, and the base station is executing the switching process at this time, and sends an error message to the core network. The core network can determine that the base station is currently unable to release the PDU session in time based on the error message sent by the base station. The core network does not need to wait for the base station to respond to the session release request. The core network can establish a voice dedicated bearer based on the received error message. The terminal can complete the switching of the call mode based on the voice dedicated bearer.

[0087] The above-mentioned call switching method receives the first indication information sent by the base station, and if the switching notification information sent by the terminal is received, the second indication information is sent to the base station, and the voice dedicated bearer is established through the received error message sent by the base station. When the base station cannot respond to the second indication information in time, the call mode of the terminal can be switched, which improves the reliability of the call process and improves the user experience during the call process.

[0088] In an exemplary embodiment, the call switching method further includes:

[0089] A call request of a first conversation mode sent by a terminal is received; and a voice dedicated bearer establishment request is sent to a base station.

[0090] The call request may be a voice call request. The first indication information is generated by the base station after receiving the voice dedicated bearer establishment request. The voice dedicated bearer establishment request may instruct the base station to establish a voice dedicated bearer with the core network.

[0091] Specifically, the core network may receive a call request for the first call mode sent by the terminal. The core network may send a voice dedicated bearer establishment request to the base station based on the call request. The base station may detect a signal value of a wireless network corresponding to the current first call mode. If the signal value of the wireless network cannot meet the preset call condition, the base station rejects the voice dedicated bearer establishment request and sends a first indication message to the core network.

[0092] Optionally, failure to meet the preset call condition may be that the signal value is less than or equal to a preset signal threshold.

[0093] In this embodiment, after receiving a call request sent by the terminal, a voice dedicated bearer establishment request is sent to the base station, and first indication information sent by the base station is received to determine the establishment status of the voice dedicated bearer with the base station.

[0094] In an exemplary embodiment, the call switching method further includes:

[0095] Release the multimedia communication session.

[0096] The multimedia communication session may be an IP Multimedia Subsystem (ims) session.

[0097] Specifically, when the core network receives the switching call information sent by the terminal and the first indication information sent by the base station, it releases the IMS session and sends the second indication information to the base station at the same time, where the second indication information is used to instruct the base station to release the PDU session.

[0098] Exemplarily, the core network may release the ims session through a service call session control function.

[0099] In this embodiment, in order to switch the call mode, the multimedia communication session is released to facilitate the subsequent establishment of a new session, thereby ensuring that the user enjoys appropriate service quality and service strategies that comply with new call technologies, thereby improving call quality and user experience.

[0100] In an exemplary embodiment, after step 202, the method further includes:

[0101] A termination message is sent to the base station.

[0102] The termination message is used to instruct the base station to terminate the switching process, and the switching process represents the switching process of the call mode initiated by the base station.

[0103] Specifically, the core network sends a termination message to the base station while initiating the establishment of a dedicated voice bearer, or, after initiating the establishment of a dedicated voice bearer, the core network sends a termination message to the base station; the termination message instructs the base station to terminate the call mode switching process, that is, after receiving the termination message, the base station can terminate the call mode switching process.

[0104] In this embodiment, a termination message is sent to the base station so that the base station terminates the switching process to prevent the switching of the terminal's call mode from being affected after the base station completes the switching process, thereby further improving the reliability of the call mode.

[0105] In an exemplary embodiment, establishing a voice dedicated bearer based on a received error message sent by a base station includes:

[0106] Receive error messages; establish voice bearer through Session Management Function (SMF).

[0107] The error message indicates that the base station cannot release the PDU session normally. For example, the error message may be a PDU SESSION RESOURCE RELEASE COMMAND ERROR message.

[0108] Specifically, the core network can receive an error message sent by the base station, and the core network can determine that the base station cannot release the PDU session normally based on the error message. The core network can establish a voice dedicated bearer through SMF. The specific process of establishing a voice dedicated bearer can be: SMF can establish a PDU session based on the information in the switching call information, and the PDU session is used to realize the transmission of voice data; SMF can coordinate with the user plane function (User Plane Function, UPF) to allocate network resources for the voice dedicated bearer, and configure UPF to ensure the correct routing and transmission of data packets; SFM can determine the priority processing of data packets, bandwidth allocation delay control, etc. according to the policy provided by the policy control function (Policy Control Function, PCF); SMF can configure the user plane path, and the terminal can transmit the voice data packet to the external data network according to the path; after the voice call ends, SMF can release all resources related to the session. It should be understood that the process of establishing a voice dedicated bearer is only for example and does not constitute a specific limitation.

[0109] In this embodiment, after receiving the error message, a voice dedicated bearer is established through SMF, so that the terminal can switch the call mode and improve the reliability of the call.

[0110] In an exemplary embodiment, the switching notification information indicates that the terminal initiates switching from a first call mode to a second call mode, the first call mode is voice over new air interface VoNR, and the second call mode is call over wireless local area network VoWiFi.

[0111] The first call mode may be a call mode under a 3rd Generation Partnership Project (3GPP) access, and the second call mode may be a call mode under a non-3rd Generation Partnership Project (Non-3GPP) access.

[0112] Specifically, the user can use VoNR to initiate a call request on the core network (5GC) on a terminal that supports the VoWiFi service. After initiating the call request, the terminal can initiate a switching notification message when it detects that the signal quality of VoNR is weak or the signal quality of VoWiFi is strong. The core network can release the IMS session when receiving the switching notification message indicating the switch from VoWiFi to VoNR.

[0113] In this embodiment, the switching indication of the terminal is obtained through the switching notification information, so as to facilitate the subsequent switching of the call mode.

[0114] In an exemplary embodiment, the switching process represents a switching process initiated by a base station from a first call mode to a third call mode, where the third call mode is a voice over long term evolution bearer (VoLTE).

[0115] Among them, the third call mode may be a call mode under 3GPP access, and the switching process may be EPSFB. EPSFB may mean that when 5G does not have VoNR conditions, the voice service falls back from 5G to 4G, relying on VoLTE to ensure the continuity of the voice service.

[0116] Specifically, after establishing the voice dedicated bearer or while establishing the voice dedicated bearer, the core network sends a termination message to the base station. The base station can terminate the conversion from 5G to 4G according to the termination switching process indicated by the termination message.

[0117] In this embodiment, based on the termination message, the switching process of the base station is terminated to improve the reliability of the call.

[0118] In an exemplary embodiment, as shown in FIG3 , a call switching method is provided, which is described by taking the method applied to the base station in FIG1 as an example, and includes the following steps:

[0119] Step 301: Send first indication information to the core network.

[0120] The first indication information may indicate that the base station rejects the voice dedicated bearer establishment request sent by the core network. The voice dedicated bearer may be a dedicated data transmission channel established for voice services. For example, the first indication information may be a reason value #36 (ims_voice_eps_fallback_or_rat_fallback_triggered).

[0121] Specifically, when the base station receives a voice dedicated bearer establishment request sent by the core network, but the base station detects that the signal is weak based on the current call mode, the base station cannot respond to the voice dedicated bearer establishment request sent by the core network. The base station sends a first indication message to the core network, indicating that the base station rejects the voice dedicated bearer establishment request sent by the core network.

[0122] Step 302: If the second indication information sent by the core network is received, an error message is sent to the core network.

[0123] The second indication information is used to instruct the base station to release the protocol data unit PDU session. For example, the second indication information may be a PDU session resource release command (PDU SESSION RESOURCE RELEASE COMMAND).

[0124] Specifically, if the base station receives the second indication information sent by the core network after sending the first indication information to the core network, and the base station is currently unable to process the release session, then the base station replies with an error message to the core network. The core network can establish a dedicated voice bearer based on the error message. The terminal can complete the switching of the call mode based on the dedicated voice bearer.

[0125] The call switching method sends the first indication information to the core network, and if the second indication information sent by the core network is received, an error message is sent to the core network. When the base station cannot respond to the second indication information in time, the call mode of the terminal can be switched, thereby improving the reliability of the call process and improving the user experience during the call process.

[0126] In an exemplary embodiment, step 301 specifically includes:

[0127] If a voice dedicated bearer establishment request sent by the core network is received and it is detected that the signal of the first call mode does not meet the preset call condition, the switching process is triggered and the first indication information is sent to the core network.

[0128] The switching process may represent a switching process of a call mode initiated by a base station. The voice dedicated bearer establishment request may instruct the base station to establish a voice dedicated bearer with the core network. The preset call condition may be a preset signal threshold.

[0129] Specifically, the terminal may send a call request for the first call mode to the core network. The core network responds to the call request and sends a voice dedicated bearer establishment request to the base station. The base station may detect the signal condition of the wireless network corresponding to the current first call mode. If the base station detects that the signal value of the first call mode does not meet the preset call condition, that is, the signal value of the first call mode is less than the preset signal threshold, the base station rejects the voice dedicated bearer establishment request. The base station triggers the switching process and sends a first indication message to the core network, wherein the switching process is a process for switching the voice task, and the first indication message may indicate to the core network that the base station cannot establish a voice dedicated bearer and that the base station is performing a call mode switching process.

[0130] In this embodiment, if it is detected that the signal of the first call mode does not meet the preset call conditions, no response is given to the request to establish a dedicated voice bearer, and a first indication message is sent to the core network to inform the core network of the current status to facilitate subsequent calls by the user.

[0131] In an exemplary embodiment, the switching process represents a switching process initiated by a base station from a first call mode to a third call mode, the first call mode is voice over new air interface VoNR, and the third call mode is voice over long term evolution VoLTE.

[0132] Among them, the switching process can be EPSFB. EPSFB means that when 5G does not have the VoNR conditions, the voice service falls back from 5G to 4G, relying on VoLTE to ensure the continuity of the voice service.

[0133] Specifically, the terminal can send a VoNR call request to the core network. The core network responds to the call request and sends a voice dedicated bearer establishment request to the base station. The base station can detect the 5G signal condition corresponding to the current VoNR. If the base station detects that 5G does not meet the preset call conditions, that is, the 5G signal value is less than the call signal threshold, the base station rejects the voice dedicated bearer establishment request. The base station triggers the switching process, which is the process of switching the voice task from 5G to 4G, and sends a first indication message to the core network, indicating the core network that the base station cannot establish a voice dedicated bearer and is performing a call mode switching process.

[0134] In this embodiment, the reliability of the call is ensured by switching the first call mode to the second call mode.

[0135] In an exemplary embodiment, the call switching method further includes:

[0136] Receive a termination message sent by the core network, and terminate the switching process based on the termination message.

[0137] Specifically, the core network sends a termination message to the base station while initiating the establishment of a dedicated voice bearer, or after the core network initiates the establishment of a dedicated voice bearer. The base station receives the termination message. The base station terminates the switching process of the call mode based on the received termination message. Exemplarily, the base station can terminate the conversion from 5G to 4G according to the termination switching process indicated by the termination message. That is, the call mode is switched from VoNR to VoLTE.

[0138] In this embodiment, the base station receives a termination message and terminates the switching process to prevent the switching of the terminal's call mode from being affected after the base station completes the switching process, thereby further improving the reliability of the call mode.

[0139] In an exemplary embodiment, the error message indicates that the base station cannot release the PDU session normally.

[0140] The error message may be a PDU session resource release command error (PDU SESSION RESOURCERELEASE COMMAND ERROR) message.

[0141] Specifically, when the base station is executing the handover process, if the base station receives the second indication information sent by the core network, the PDU session cannot be released normally. The base station may send an error message to the core network.

[0142] In this embodiment, an error message is sent to the core network to prevent the core network from waiting, so that the core network can switch the call mode in time, thereby improving the reliability of the call.

[0143] In an exemplary embodiment, as shown in FIG. 4 , a call switching method is provided, which is described by taking the method applied to the terminal in FIG. 1 as an example, and includes the following steps:

[0144] Step 401: Send switching notification information to the core network.

[0145] The terminal may be a terminal that supports multiple call modes, for example, VoWiFi, VoNR, VoLTE, etc. The switching notification information may indicate that the terminal initiates the switching of the call mode.

[0146] Specifically, the terminal can detect the quality of the current wireless signal. If the signal quality of the current method for initiating a call is poor, the terminal can initiate a switching notification message for switching the call mode, instructing the core network to switch the call mode.

[0147] Step 402: If the core network establishes a dedicated voice bearer, the call mode is switched through the dedicated voice bearer.

[0148] The voice dedicated bearer may be a dedicated data transmission channel established for voice services.

[0149] Specifically, the terminal may receive a message from the core network to establish a dedicated voice bearer. If the base station receives a signal from the core network to establish a dedicated voice bearer, the terminal may complete the switching of the call mode based on the established dedicated voice bearer. The terminal may make a call according to the switched call mode.

[0150] The above-mentioned call switching method improves the reliability of the call process and improves the user experience during the call process by sending switching communication information to the core network and completing the switching of the call mode based on the voice dedicated bearer.

[0151] In an exemplary embodiment, step 401 specifically includes:

[0152] If the signal quality value of the first call mode is less than the preset signal quality threshold, and the signal quality value of the second call mode is greater than the preset signal quality threshold, switching notification information is sent to the core network.

[0153] The signal quality value may be determined by factors such as signal strength, network quality, and packet loss rate. The preset signal quality threshold may be set based on network optimization results of network operators and user service quality requirements. The setting of the preset signal quality threshold requires a balance between maintaining the stability of the current call mode and the timeliness of switching to another call mode.

[0154] Specifically, the terminal can continuously monitor the signal quality of the current call mode, and use indicators such as reference signal received power (RSRP), received signal strength indicator (RSSI), signal-to-noise ratio (SNR), etc. to evaluate. The terminal compares the signal quality value of the monitored first call mode with the preset signal quality threshold, and compares the signal quality value of the first call mode with the preset signal quality threshold. If the terminal detects that the signal quality value of the first call is lower than the preset signal quality threshold, and the signal quality value of the second call mode is higher than the threshold value. The terminal will initiate a call mode switch. The terminal can send switching communication information to the core network, and the core network can switch the subsequent call mode according to the switching communication information. In addition, the terminal can optimize the preset signal quality threshold based on network testing, user feedback, and continuous monitoring of network performance by network operators.

[0155] In this embodiment, the call mode is switched by judging the signal quality to ensure the continuity and quality of the call.

[0156] In an exemplary embodiment, the call switching method further includes:

[0157] A call request for the first call mode is initiated to the core network.

[0158] The call request may be a voice call request.

[0159] Specifically, the user enters a phone number and initiates a call, the terminal establishes a signaling connection, and sends a call request to the core network. The terminal can send the call request to the core network through the wireless access network. In addition, after the terminal initiates the call request based on the first call mode, it can continuously detect the signal status of the network.

[0160] In an exemplary embodiment, the switching notification information indicates that the terminal initiates switching from a first call mode to a second call mode, the first call mode is voice over new air interface VoNR, and the second call mode is call over wireless local area network VoWiFi.

[0161] Specifically, the user can use VoNR to initiate a call request on the core network (5GC) on a terminal that supports the VoWiFi service. After initiating the call request, the terminal can initiate a switching notification message when it detects that the signal quality of VoNR is weak or the signal quality of VoWiFi is strong. The core network can release the IMS session when receiving the switching notification message indicating the switch from VoWiFi to VoNR.

[0162] In this embodiment, a call switching indication is sent to the core network through the switching notification information to facilitate the subsequent switching of the call mode.

[0163] In one embodiment, FIG5 provides a signaling interaction flow chart of a call switching method. As shown in FIG5, the method includes the following steps:

[0164] Step 501: A terminal supporting the VoWiFi service initiates a call request to a core network using VoNR.

[0165] Step 502: The core network initiates a voice dedicated bearer establishment request to the base station.

[0166] Step 503: The base station detects that the NR signal is poor, and replies with a reason value EPSFB to the core network.

[0167] Step 504: The terminal detects that the NR signal quality value is less than the preset signal quality threshold, and the WiFi signal quality value is greater than the preset signal quality threshold, and sends the switching notification information to the core network.

[0168] Step 505: After receiving the handover notification message, the core network initiates the release of the IMS session and sends a second indication message to the base station, instructing the base station to release the PDU session.

[0169] Step 506: The base station is performing the EPSFB process and returns an error message to the core network.

[0170] Step 507: After the core network receives the error message, the SMF establishes a dedicated voice bearer.

[0171] Step 508: The core network sends a voice dedicated bearer establishment success message to the terminal, and the terminal completes the switching of the call mode based on the voice dedicated bearer.

[0172] Step 509: The core network sends a termination message to the base station, so that the base station terminates the EPSFB process.

[0173] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0174] Based on the same inventive concept, the embodiment of the present application also provides a call switching device for implementing the call switching method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more call switching device embodiments provided below can refer to the limitations of the call switching method above, and will not be repeated here.

[0175] In an exemplary embodiment, as shown in FIG6 , a call switching device is provided, which is applied to a core network. The call switching device 60 includes: a receiving module 61, a first sending module 62 and a first switching module 63, wherein:

[0176] A receiving module 61 is configured to receive first indication information sent by a base station, where the first indication information indicates that the base station rejects a voice dedicated bearer establishment request;

[0177] The first sending module 62 is used for sending second indication information to the base station if the switching notification information sent by the terminal is received, the switching notification information indicates that the terminal initiates the switching of the call mode, and the second indication information is used to instruct the base station to release the protocol data unit PDU session;

[0178] The first switching module 63 is used to establish a dedicated voice bearer based on the received error message sent by the base station, so that the terminal completes the switching of the call mode through the dedicated voice bearer.

[0179] In one embodiment, the first indication information is generated by the base station after receiving the voice dedicated bearer establishment request, and the first sending module 62 is further used to receive a call request of the first call mode sent by the terminal;

[0180] Send a voice dedicated bearer establishment request to the base station.

[0181] In one embodiment, the first switching module 63 is further configured to release the multimedia communication session.

[0182] In one embodiment, the first switching module 63 is further used to send a termination message to the base station, where the termination message is used to instruct the base station to terminate the switching process, where the switching process represents a switching process of a call mode initiated by the base station.

[0183] In one embodiment, the first switching module 63 is configured to receive an error message, where the error message indicates that the base station cannot normally release the PDU session;

[0184] A dedicated voice bearer is established through the session management function SMF.

[0185] In one of the embodiments, the switching notification information indicates that the terminal initiates a switch from a first call mode to a second call mode, the first call mode is voice over new air interface VoNR, and the second call mode is wireless local area network call VoWiFi.

[0186] In one of the embodiments, the switching process represents a switching process initiated by a base station from a first call mode to a third call mode, and the third call mode is a voice over long term evolution bearer VoLTE.

[0187] In an exemplary embodiment, as shown in FIG. 7 , a call switching device is provided, which is applied to a base station. The call switching device 70 includes: a second sending module 71 and a third sending module 72, wherein:

[0188] The second sending module 71 is used to send first indication information to the core network, where the first indication information indicates that the base station rejects the voice dedicated bearer establishment request sent by the core network;

[0189] The third sending module 72 is configured to send an error message to the core network if second indication information sent by the core network is received, where the second indication information is used to instruct the base station to release the protocol data unit PDU session.

[0190] In one of the embodiments, the second sending module 71 is specifically used to trigger the switching process and send the first indication information to the core network if a voice dedicated bearer establishment request is received from the core network and it is detected that the signal of the first call mode does not meet the preset call conditions. The switching process represents the switching process of the call mode initiated by the base station.

[0191] In one of the embodiments, the switching process represents a switching process initiated by a base station from a first call mode to a third call mode, the first call mode is voice over new air interface VoNR, and the third call mode is voice over long term evolution VoLTE.

[0192] In one of the embodiments, the third sending module 72 is further configured to receive a termination message sent by the core network, and terminate the switching process based on the termination message.

[0193] In one of the embodiments, the error message indicates that the base station cannot release the PDU session normally.

[0194] In an exemplary embodiment, as shown in FIG8 , a call switching device is provided, which is applied to a terminal. The call switching device 80 includes: a fourth sending module 81 and a second switching module 82, wherein:

[0195] The fourth sending module 81 is used to send switching notification information to the core network, where the switching notification information indicates that the terminal initiates the switching of the call mode;

[0196] The second switching module 82 is configured to complete the switching of the call mode through the voice dedicated bearer if the core network establishes a voice dedicated bearer.

[0197] In one of the embodiments, the fourth sending module 81 is specifically configured to send switching notification information to the core network if the signal quality value of the first call mode is less than a preset signal quality threshold and the signal quality value of the second call mode is greater than the preset signal quality threshold.

[0198] In one embodiment, the fourth sending module 81 is further configured to initiate a call request of the first call mode to the core network.

[0199] In one of the embodiments, the switching notification information indicates that the terminal initiates a switch from a first call mode to a second call mode, the first call mode is voice over new air interface VoNR, and the second call mode is wireless local area network call VoWiFi.

[0200] Each module in the above-mentioned call switching device can be implemented in whole or in part by software, hardware or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute the corresponding operations of each module.

[0201] In an exemplary embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be shown in FIG9. The computer device includes a processor, a memory, an input / output interface, a communication interface, and an input device. The processor, the memory, and the input / output interface are connected via a system bus, and the communication interface and the input device are connected to the system bus via the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a mobile cellular network, a near field communication (NFC) or other technologies. When the computer program is executed by the processor, a call switching method is implemented.

[0202] Those skilled in the art will understand that the structure shown in FIG. 9 is merely a block diagram of a partial structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0203] In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0204] receiving first indication information sent by a base station, where the first indication information indicates that the base station rejects a voice dedicated bearer establishment request;

[0205] If the switching notification information sent by the terminal is received, second indication information is sent to the base station, where the switching notification information indicates that the terminal initiates the switching of the call mode, and the second indication information is used to instruct the base station to release the protocol data unit PDU session;

[0206] Based on the received error message sent by the base station, a voice dedicated bearer is established, so that the terminal completes the switching of the conversation mode through the voice dedicated bearer.

[0207] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0208] receiving first indication information sent by a base station, where the first indication information indicates that the base station rejects a voice dedicated bearer establishment request;

[0209] If the switching notification information sent by the terminal is received, second indication information is sent to the base station, where the switching notification information indicates that the terminal initiates the switching of the call mode, and the second indication information is used to instruct the base station to release the protocol data unit PDU session;

[0210] Based on the received error message sent by the base station, a voice dedicated bearer is established, so that the terminal completes the switching of the conversation mode through the voice dedicated bearer.

[0211] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps:

[0212] receiving first indication information sent by a base station, where the first indication information indicates that the base station rejects a voice dedicated bearer establishment request;

[0213] If the switching notification information sent by the terminal is received, second indication information is sent to the base station, where the switching notification information indicates that the terminal initiates the switching of the call mode, and the second indication information is used to instruct the base station to release the protocol data unit PDU session;

[0214] Based on the received error message sent by the base station, a voice dedicated bearer is established, so that the terminal completes the switching of the conversation mode through the voice dedicated bearer.

[0215] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., but are not limited to this.

[0216] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0217] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A call switching method, characterized in that: Applied to a core network, the method comprises: receiving first indication information sent by a base station, where the first indication information indicates that the base station rejects a voice dedicated bearer establishment request; If the switching notification information sent by the terminal is received, sending second indication information to the base station, the switching notification information indicates that the terminal initiates the switching of the call mode, and the second indication information is used to instruct the base station to release the protocol data unit PDU session; Based on the received error message sent by the base station, a voice dedicated bearer is established, so that the terminal completes the switching of the conversation mode through the voice dedicated bearer.

2. The method according to claim 1, characterized in that The first indication information is generated by the base station after receiving a voice dedicated bearer establishment request, and the method further includes: Receiving a call request of a first conversation mode sent by a terminal; A voice dedicated bearer establishment request is sent to the base station.

3. The method according to claim 1, characterized in that The method further comprises: Release the multimedia communication session.

4. The method according to claim 1, characterized in that After the step of establishing a dedicated voice bearer based on the received error message sent by the base station, the method further includes: A termination message is sent to the base station, where the termination message is used to instruct the base station to terminate a switching process, where the switching process represents a switching process of a call mode initiated by the base station.

5. The method according to claim 1, characterized in that: The establishing of a voice dedicated bearer based on the received error message sent by the base station includes: receiving an error message, wherein the error message indicates that the base station cannot normally release the PDU session; A dedicated voice bearer is established through the session management function SMF.

6. The method according to claim 1, characterized in that The switching notification information indicates that the terminal initiates a switch from a first call mode to a second call mode, where the first call mode is voice over new air interface VoNR, and the second call mode is call over wireless local area network VoWiFi.

7. The method according to claim 4, characterized in that The switching process represents a switching process initiated by the base station from a first call mode to a third call mode, and the third call mode is a long term evolution voice bearer VoLTE.

8. A call switching method, characterized in that: Applied to a base station, the method comprises: Sending first indication information to the core network, where the first indication information indicates that the base station rejects the voice dedicated bearer establishment request sent by the core network; If second indication information sent by the core network is received, an error message is sent to the core network, where the second indication information is used to instruct the base station to release the protocol data unit PDU session.

9. The method according to claim 8, characterized in that The sending the first indication information to the core network includes: If a voice dedicated bearer establishment request sent by the core network is received and it is detected that the signal of the first call mode does not meet the preset call conditions, the switching process is triggered and a first indication message is sent to the core network. The switching process represents the switching process of the call mode initiated by the base station.

10. The method according to claim 9, characterized in that The switching process represents a switching process initiated by the base station from a first call mode to a third call mode, the first call mode is voice over new air interface VoNR, and the third call mode is voice over long term evolution VoLTE.

11. The method according to claim 9, characterized in that The method further comprises: A termination message sent by the core network is received, and the switching process is terminated based on the termination message.

12. The method according to claim 8, characterized in that The error message indicates that the base station cannot release the PDU session normally.

13. A call switching method, characterized in that: Applied to a terminal, the method comprises: Sending a switching notification message to the core network, wherein the switching notification message indicates that the terminal initiates a switching of a call mode; If the core network establishes a dedicated voice bearer, the call mode is switched through the dedicated voice bearer.

14. The method according to claim 13, characterized in that The sending the switching notification information to the core network includes: If the signal quality value of the first call mode is less than a preset signal quality threshold, and the signal quality value of the second call mode is greater than the preset signal quality threshold, switching notification information is sent to the core network.

15. The method according to claim 13, characterized in that The method further comprises: A call request of the first conversation mode is initiated to the core network.

16. The method according to claim 13, characterized in that The switching notification information indicates that the terminal initiates a switch from a first call mode to a second call mode, where the first call mode is voice over new air interface VoNR, and the second call mode is call over wireless local area network VoWiFi.

17. A call switching device, characterized in that: Applied to a core network, the device comprises: A receiving module, configured to receive first indication information sent by a base station, wherein the first indication information indicates that the base station rejects a voice dedicated bearer establishment request; A first sending module, configured to send second indication information to the base station if a switching notification information sent by the terminal is received, wherein the switching notification information indicates that the terminal initiates the switching of the call mode, and the second indication information is used to instruct the base station to release the protocol data unit PDU session; The first switching module is used to establish a voice dedicated bearer based on the received error message sent by the base station, so that the terminal completes the switching of the conversation mode through the voice dedicated bearer.

18. A call switching device, characterized in that: Applied to a base station, the device comprises: A second sending module is used to send first indication information to the core network, where the first indication information indicates that the base station rejects the voice dedicated bearer establishment request sent by the core network; The third sending module is used to send an error message to the core network if second indication information sent by the core network is received, and the second indication information is used to instruct the base station to release the protocol data unit PDU session.

19. A call switching device, characterized in that: Applied to a terminal, the device comprises: A fourth sending module, configured to send switching notification information to the core network, wherein the switching notification information indicates that the terminal initiates the switching of the call mode; The second switching module is used to complete the switching of the call mode through the voice dedicated bearer if the core network establishes a voice dedicated bearer.

20. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 16 are implemented.

21. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 16 are implemented.

22. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 16 are implemented.

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