Method, device, network equipment, medium and product for optimizing voice call process

Abstract

The present application provides a method, apparatus, network equipment, medium and product for optimizing a voice call process. When a terminal falls back from a 5G communication system to a 4G communication system due to a voice call service, a 5G base station sends a switching request message containing voice fallback indication information to a 5G core network. When the 5G core network communicates with the 4G communication system, it can send the voice fallback indication information to the 4G communication system. After receiving the indication information, the 4G communication system determines that the terminal falls back to the 4G communication system due to the voice call service. Therefore, after the terminal falls back from the 5G communication system to the 4G communication system, due to the existence of the voice fallback indication message, the 4G communication system does not perform relevant measurement configurations of the 5G communication system, thereby ensuring the normal progress of the EPSFB process, and further ensuring that the terminal can make a voice call in the 4G communication system.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a method, device, network equipment, medium and product for optimizing a voice call process. Background Art

[0002] VONR (Voice Over NR) is a voice service of the 5G communication system. During a voice call, if the 5G base stations to which the calling device and the called device are connected both support the VONR service, the two devices can conduct a voice call based on the wireless resources of the 5G communication system.

[0003] Since 5G communication resources have not yet been widely covered, the voice call services of existing 5G users are usually implemented based on EPSFB (Evolved Packet System Fallback) technology. Specifically, when a user initiates a voice call in the 5G communication system, the call terminal is fallen back to the 4G communication system by executing the EPSFB process, and a voice call is made in the 4G communication system through VOLTE (Voice Over Long-Term Evolution).

[0004] However, due to the existence of the fast return to 5G strategy, the 4G communication system may be concurrent with the EPSFB process when executing the fast return to 5G strategy, causing the calling terminal to return to the 5G communication system prematurely without completing the EPSFB process, resulting in voice call failure. Summary of the invention

[0005] The present application provides a method, device, network equipment, medium and product for optimizing a voice call process, so as to solve the problems existing in the prior art.

[0006] In a first aspect, the present application provides a method for optimizing a voice call process, which is applied to a 5G base station, including:

[0007] Determine whether the terminal UE to be switched is in an evolved packet system fallback EPSFB state, and generate a switching request message based on the determination result, wherein when the UE is in the EPSFB state, the switching request message includes voice fallback indication information for indicating that the UE falls back from the 5G communication system to the 4G communication system based on a voice call service;

[0008] Sending the handover request message to the 5G core network;

[0009] Receiving a handover command message sent by the 5G core network;

[0010] A switching command is sent to the UE, where the switching command is used to instruct the UE to perform a switch from the 5G communication system to the 4G communication system.

[0011] In some embodiments, before determining whether the terminal UE to be switched is in the evolved packet system fallback EPSFB state, the method further includes:

[0012] When the UE accesses the 5G base station and the UE is in a connected state, receiving 4G communication system measurement information sent by the UE;

[0013] According to the 4G communication system measurement information, a handover preparation process for the UE to perform handover between communication systems is performed.

[0014] In some embodiments, the determining whether the terminal UE to be switched is in an evolved packet system fallback EPSFB state includes:

[0015] Receive a protocol data unit (PDU) modification request message sent by the 5G core network, and establish a 5G service quality identifier 5QI1;

[0016] Determine whether the 5G base station supports the 5G voice service VONR of the 5G communication system;

[0017] If not supported, a PDU modification failure message is sent to the 5G core network, and the UE is determined to enter the EPSFB state, wherein the PDU modification failure message includes voice fallback indication information.

[0018] In some embodiments, it also includes:

[0019] If the 5G base station supports the VONR service, a 5QI1 bearer is established and a PDU modification success message is sent to the 5G core network, wherein the 5QI1 bearer is used to implement the voice call of the UE in the 5G communication system.

[0020] In a second aspect, the present application provides a method for optimizing a voice call process, which is applied to a 4G base station, including:

[0021] Receiving a communication message sent by the 4G core network to indicate that the UE is communicating from the 5G communication system to the 4G communication system;

[0022] Determine whether the communication message includes voice fallback indication information for indicating that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service;

[0023] If included, the voice fallback indication information is added to the UE context corresponding to the terminal.

[0024] In some embodiments, the communication message includes a switching request message used to characterize the switching of the UE from a 5G communication system to a 4G communication system.

[0025] In some embodiments, the communication message includes an initial context establishment request message sent by the 4G core network to the 4G base station after receiving a non-access layer NAS message of the UE sent by the 4G base station.

[0026] In some embodiments, it also includes:

[0027] After the UE accesses the 4G communication system, a mobility measurement configuration within the 4G communication system is configured for the UE.

[0028] In some embodiments, it also includes:

[0029] If the switching request message does not include the voice fallback indication information, after the UE accesses the 4G communication system, the mobility measurement configuration within the 4G communication system and the mobility measurement configuration between the 5G communication system and the 4G communication system are configured for the UE.

[0030] In some embodiments, after receiving the handover request message sent by the 4G core network, the method further includes:

[0031] Determining whether handover preparation for implementing UE to switch the communication system is completed;

[0032] If completed, a switching request confirmation message is sent to the 4G core network.

[0033] In some embodiments, the determining whether the handover preparation for implementing the UE to switch the communication system is completed includes:

[0034] Determine whether the handover preparation is complete based on the target cell information, 4G base station resources and the UE's public land mobile network PLMN.

[0035] In some embodiments, it also includes:

[0036] If it is determined that the switching preparation is not completed, a switching preparation failure message is sent to the 4G core network.

[0037] In some embodiments, it also includes:

[0038] After the UE accesses the 4G communication system, a 4G service quality level identifier QCI1 bearer is established, and the QCI1 bearer is used to implement a voice call conversation of the UE in the 4G communication system;

[0039] After the call is completed, if it is confirmed to delete the QCI1 bearer, it is determined whether it is necessary to quickly return to the 5G communication system, and corresponding processing is performed based on the determination result.

[0040] In some embodiments, the determining whether it is necessary to quickly return to the 5G communication system and performing corresponding processing based on the determination result include:

[0041] Determine whether the UE context contains voice fallback indication information;

[0042] If included, the configuration of deleting the QCI1 bearer is performed for the UE, and the measurement configuration of quickly returning to the 5G communication system is performed;

[0043] If not included, the configuration of deleting the QCI1 bearer is performed for the UE.

[0044] In a third aspect, the present application provides a method for optimizing a voice call process, which is applied to a 5G core network, including:

[0045] Receive a UE context release request message sent by a 5G base station;

[0046] Determine whether the UE context release request message includes voice fallback indication information used to indicate that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service;

[0047] If included, add voice fallback indication information to the UE context;

[0048] A UE context release command is sent to the 5G base station, where the UE context release command is used to instruct the 5G base station to switch the UE to an idle state.

[0049] In some embodiments, it also includes:

[0050] Upon receiving a UE context request message sent by the 4G core network, obtaining the context of the UE;

[0051] A UE context response message is sent to the 4G core network, where the UE context response message includes a UE context, and the UE context includes the voice fallback indication information.

[0052] In some embodiments, it also includes:

[0053] If the UE context release request message does not include the voice fallback indication message, no voice fallback indication information is added to the UE context, and the UE context release command is sent to the 5G base station;

[0054] When receiving the UE context request message sent by the 4G core network, the context of the UE is obtained, and a UE context response message is sent to the 4G core network, where the UE context response message includes the UE context, and the UE context does not include the voice fallback indication information.

[0055] In a fourth aspect, the present application provides a method for optimizing a voice call process, which is applied to a 4G core network, including:

[0056] Send a UE context request message to the 5G core network;

[0057] Receiving a UE context response message sent by the 5G core network;

[0058] Determine whether the UE context response message includes voice fallback indication information used to indicate that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service;

[0059] If included, an initial context establishment request message is sent to the 4G base station, and the initial context establishment request message includes the voice fallback indication information.

[0060] In some embodiments, it also includes:

[0061] Receive a tracking area update TAU request message sent by the UE, where the TAU request message includes the UE's global unique temporary identifier GUTI;

[0062] Determine the access and mobility management function AMF corresponding to the UE in the 5G communication system according to the GUTI;

[0063] The sending a UE context request message to the 5G core network includes:

[0064] Send the UE context request message to the AMF corresponding to the UE.

[0065] In some embodiments, it also includes:

[0066] If the UE context response message does not include the voice fallback indication message, an initial context establishment request message that does not include the voice fallback indication message is sent to the 4G base station.

[0067] In a fifth aspect, the present application provides a network device, the network device comprising a memory, a transceiver, and a processor:

[0068] A memory for storing a computer program; a transceiver for transmitting and receiving data under the control of the processor; and a processor for reading the computer program in the memory and performing the following operations:

[0069] Determine whether the terminal UE to be switched is in an evolved packet system fallback EPSFB state, and generate a switching request message based on the determination result, wherein when the UE is in the EPSFB state, the switching request message includes voice fallback indication information for indicating that the UE falls back from the 5G communication system to the 4G communication system based on a voice call service;

[0070] Sending the handover request message to the 5G core network;

[0071] Receiving a handover command message sent by the 5G core network;

[0072] A switching command is sent to the UE, where the switching command is used to instruct the UE to perform a switch from the 5G communication system to the 4G communication system.

[0073] In some embodiments, the processor is further configured to perform the following operations:

[0074] Receive a protocol data unit (PDU) modification request message sent by the 5G core network, and establish a 5G service quality identifier 5QI1;

[0075] Determine whether the 5G base station supports the 5G voice service VONR of the 5G communication system;

[0076] If not supported, a PDU modification failure message is sent to the 5G core network, and the UE is determined to enter the EPSFB state, wherein the PDU modification failure message includes voice fallback indication information.

[0077] In some embodiments, the processor is further configured to perform the following operations:

[0078] If the 5G base station supports the VONR service, a 5QI1 bearer is established and a PDU modification success message is sent to the 5G core network, wherein the 5QI1 bearer is used to implement the voice call of the UE in the 5G communication system.

[0079] In a sixth aspect, the present application provides a network device, the network device comprising a memory, a transceiver, and a processor:

[0080] A memory for storing a computer program; a transceiver for transmitting and receiving data under the control of the processor; and a processor for reading the computer program in the memory and performing the following operations:

[0081] Receiving a communication message sent by the 4G core network to indicate that the UE falls back from the 5G communication system to the 4G communication system;

[0082] Determine whether the communication message includes voice fallback indication information for indicating that the UE is switching from the 5G communication system to the 4G communication system based on a voice call service;

[0083] If included, the voice fallback indication information is added to the UE context corresponding to the terminal.

[0084] In some embodiments, the communication message includes a switching request message used to characterize the switching of the UE from a 5G communication system to a 4G communication system.

[0085] In some embodiments, the communication message includes an initial context establishment request message sent by the 4G core network to the 4G base station after receiving a non-access layer NAS message of the UE sent by the 4G base station.

[0086] In some embodiments, the processor is further configured to perform the following operations:

[0087] After the UE accesses the 4G communication system, a mobility measurement configuration within the 4G communication system is configured for the UE.

[0088] In some embodiments, the processor is further configured to perform the following operations:

[0089] After the UE accesses the 4G communication system, a 4G service quality level identifier QCI1 bearer is established, and the QCI1 bearer is used to implement a voice call conversation of the UE in the 4G communication system;

[0090] After the call is completed, if it is confirmed to delete the QCI1 bearer, it is determined whether it is necessary to quickly return to the 5G communication system, and corresponding processing is performed based on the determination result.

[0091] In some embodiments, the processor is further configured to perform the following operations:

[0092] Determine whether the UE context contains voice fallback indication information;

[0093] If included, the configuration of deleting the QCI1 bearer is performed for the UE, and the measurement configuration of quickly returning to the 5G communication system is performed;

[0094] If not included, the configuration of deleting the QCI1 bearer is performed for the UE.

[0095] In a seventh aspect, the present application provides a network device, the network device comprising a memory, a transceiver, and a processor:

[0096] A memory for storing a computer program; a transceiver for transmitting and receiving data under the control of the processor; and a processor for reading the computer program in the memory and performing the following operations:

[0097] Receive a UE context release request message sent by a 5G base station;

[0098] Determine whether the UE context release request message includes voice fallback indication information used to indicate that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service;

[0099] If included, add voice fallback indication information to the UE context;

[0100] A UE context release command is sent to the 5G base station, where the UE context release command is used to instruct the 5G base station to switch the UE to an idle state.

[0101] In some embodiments, the processor is further configured to perform the following operations:

[0102] Upon receiving a UE context request message sent by the 4G core network, obtaining the context of the UE;

[0103] A UE context response message is sent to the 4G core network, where the UE context response message includes a UE context, and the UE context includes the voice fallback indication information.

[0104] In some embodiments, the processor is further configured to perform the following operations:

[0105] If the UE context release request message does not include the voice fallback indication message, no voice fallback indication information is added to the UE context, and the UE context release command is sent to the 5G base station;

[0106] When receiving the UE context request message sent by the 4G core network, the context of the UE is obtained, and a UE context response message is sent to the 4G core network, where the UE context response message includes the UE context, and the UE context does not include the voice fallback indication information.

[0107] In an eighth aspect, the present application provides a network device, the network device comprising a memory, a transceiver, and a processor:

[0108] A memory for storing a computer program; a transceiver for transmitting and receiving data under the control of the processor; and a processor for reading the computer program in the memory and performing the following operations:

[0109] Send a UE context request message to the 5G core network;

[0110] Receiving a UE context response message sent by the 5G core network;

[0111] Determine whether the UE context response message includes voice fallback indication information used to indicate that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service;

[0112] If included, an initial context establishment request message is sent to the 4G base station, and the initial context establishment request message includes the voice fallback indication information.

[0113] In some embodiments, the processor is further configured to perform the following operations:

[0114] Receive a tracking area update TAU request message sent by the UE, where the TAU request message includes the UE's global unique temporary identifier GUTI;

[0115] Determine the access and mobility management function AMF corresponding to the UE in the 5G communication system according to the GUTI;

[0116] Send the UE context request message to the AMF corresponding to the UE.

[0117] In some embodiments, the processor is further configured to perform the following operations:

[0118] If the UE context response message does not include the voice fallback indication message, an initial context establishment request message that does not include the voice fallback indication message is sent to the 4G base station.

[0119] In a ninth aspect, the present application provides a device for optimizing a voice call process, which is applied to a 5G base station, including:

[0120] A judgment module, used to judge whether the terminal UE to be switched is in an evolved packet system fallback EPSFB state, and generate a switching request message based on the judgment result, wherein when the UE is in the EPSFB state, the switching request message includes voice fallback indication information used to characterize that the UE falls back from the 5G communication system to the 4G communication system based on a voice call service;

[0121] A sending module, used to send the handover request message to the 5G core network;

[0122] A receiving module, used to receive a handover command message sent by the 5G core network;

[0123] The sending module is also used to send a switching command to the UE, and the switching command is used to instruct the UE to perform a switch from the 5G communication system to the 4G communication system.

[0124] In a tenth aspect, the present application provides a device for optimizing a voice call process, which is applied to a 4G base station, including:

[0125] A receiving module, used to receive a communication message sent by the 4G core network to indicate that the UE is communicating from the 5G communication system to the 4G communication system;

[0126] A judgment module, used to judge whether the communication message contains voice fallback indication information used to indicate that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service;

[0127] The processing module is used to add the voice fallback indication information to the UE context corresponding to the terminal when the communication message includes the voice fallback indication information.

[0128] In an eleventh aspect, the present application provides an optimization device for a voice call process, which is applied to a 5G core network, including:

[0129] A receiving module, used to receive a UE context release request message sent by a 5G base station;

[0130] A judgment module, used to judge whether the UE context release request message includes voice fallback indication information used to characterize that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service;

[0131] A processing module, configured to add voice fallback indication information to the context of the UE when the UE context release request message includes voice fallback indication information;

[0132] A sending module is used to send a UE context release command to the 5G base station, and the UE context release command is used to instruct the 5G base station to switch the UE to an idle state.

[0133] In a twelfth aspect, the present application provides a device for optimizing a voice call process, which is applied to a 4G core network, including:

[0134] A sending module, used to send a UE context request message to the 5G core network;

[0135] A receiving module, used to receive a UE context response message sent by the 5G core network;

[0136] A judgment module, used to judge whether the UE context response message includes voice fallback indication information used to indicate that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service;

[0137] The sending module is further configured to send an initial context establishment request message to a 4G base station when the UE context response message includes voice fallback indication information, wherein the initial context establishment request message includes the voice fallback indication information.

[0138] In a thirteenth aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer execution instructions, and when the computer execution instructions are executed by a processor, they are used to implement the above-mentioned method for optimizing the voice call process.

[0139] In a fourteenth aspect, the present application provides a computer program product, including a computer program, which implements the above-mentioned method for optimizing the voice call process when executed by a processor.

[0140] The present application provides a method, apparatus, network equipment, medium and product for optimizing a voice call process. When a terminal falls back from a 5G communication system to a 4G communication system due to a voice call service, a 5G base station sends a switching request message containing voice fallback indication information to a 5G core network. When the 5G core network communicates with the 4G communication system, it can send the voice fallback indication information to the 4G communication system. After receiving the indication information, the 4G communication system determines that the terminal falls back to the 4G communication system due to the voice call service. Therefore, after the terminal falls back from the 5G communication system to the 4G communication system, the 4G communication system does not perform relevant measurement configurations of the 5G communication system, thereby ensuring the normal progress of the EPSFB process, and further ensuring that the terminal can make voice calls in the 4G communication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0141] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0142] Figure 1 A schematic diagram of an application scenario of the solution of this application;

[0143] Figure 2 A schematic diagram of another application scenario of the solution of the present application;

[0144] Figure 3 Schematic diagram of the EPSFB process based on switching in an embodiment of the present application;

[0145] Figure 4 Schematic diagram of the EPSFB process based on redirection in an embodiment of the present application;

[0146] Figure 5 A schematic diagram of an optimization method for a voice call process applied to a 5G base station in an embodiment of the present application;

[0147] Figure 6 This is a schematic diagram of a 5G base station determining whether a UE is in an EPSFB state in an embodiment of the present application;

[0148] Figure 7 A schematic diagram of an optimization method for a voice call process applied to a 4G base station in an embodiment of the present application;

[0149] Figure 8 This is a schematic diagram of a 4G base station in an embodiment of the present application determining whether it is necessary to quickly return to the 5G communication system and performing corresponding processing based on the determination result;

[0150] Fig. 9 A schematic diagram of an optimization method for a voice call process applied to a 5G core network in an embodiment of the present application;

[0151] Fig.10 A schematic diagram of an optimization method for a voice call process applied to a 4G core network in an embodiment of the present application;

[0152] Fig.11 A schematic diagram of an optimization method for a voice call process applied to a 4G base station in an embodiment of the present application;

[0153] Fig.12 A schematic diagram of a network device in an embodiment of the present application;

[0154] Fig.13 A schematic diagram of a device for optimizing a voice call process provided by an embodiment of the present application;

[0155] Fig.14 Another schematic diagram of the device for optimizing the voice call process provided by an embodiment of the present application;

[0156] Fig.15 Another schematic diagram of the device for optimizing the voice call process provided by an embodiment of the present application;

[0157] Fig.16 Another schematic diagram of the device for optimizing the voice call process provided in an embodiment of the present application.

[0158] The above drawings show clear embodiments of the present disclosure, which will be described in more detail below. These drawings and text descriptions are not intended to limit the scope of the present disclosure in any way, but to illustrate the concepts of the present disclosure to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0159] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0160] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "an" and "the" used in the embodiments of the present application are also intended to include plural forms, unless the context clearly indicates other meanings.

[0161] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0162] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0163] First, the application scenarios involved in this application are explained:

[0164] Figure 1 A schematic diagram of the application scenario of the solution of this application, such as Figure 1 As shown, the 4G communication system includes a 4G base station eNB and a 4G core network EPC (Evolved Packet Core), and the 5G communication system includes a 5G base station gNB and a 5G core network 5GC (5G Core). The terminal UE can access the 4G base station to use the wireless resources of the 4G communication system, or access the 5G base station to use the wireless resources of the 5G communication system.

[0165] Figure 2 A schematic diagram of another application scenario of the solution of this application, such as Figure 2 As shown, terminal 1, as a calling device, initiates a voice call to terminal 2 (called device) in the 5G communication system. At this time, the network device determines whether the 5G base station to which terminal 1 is connected supports the VONR service. If so, the voice call between terminal 1 and terminal 2 is carried out through the VONR service of the 5G communication system; otherwise, terminal 1 is returned to the 4G communication system by executing the EPSFB process, and the voice call between terminal 1 and terminal 2 is carried out through VOLTE in the 4G communication system.

[0166] The EPSFB process specifically includes: Terminal 1 initiates a voice call in the 5G communication system. When the 5G core network sends a PDU (Protocol Data Unit) modification message to the 5G base station and carries the 5QI1 (5G Quality Of Service Identifier) ​​bearer establishment, the 5G base station will directly reply to the 5G core network with a PDU modification failure message when its own configuration does not support the VONR service. The message carries the Cause value of IMS Voice EPS Fallback OrRAT Fallback Triggered (IMS Voice Evolved Packet System Fallback or Inter-System Fallback Triggered), and then executes the EPSFB process to fall back Terminal 1 to the 4G communication system. IMS is IP Multimedia Subsystem; EPS is Evolved Packet System; RAT is Radio Access Type.

[0167] EPSFB processes can be divided into the following two types:

[0168] (1) EPSFB process based on switching: The terminal falls back from the 5G communication system to the 4G communication system and remains connected. It switches to the 4G communication system to establish a QCI1 (Quality Of Service Class Identifier) ​​bearer to complete the VOLTE call process.

[0169] (2) EPSFB process based on redirection: The 5G base station sends a context request carrying the Cause value of IMS Voice EPSFallback Or RAT Fallback Triggered to the 5G core network and releases the terminal. The terminal searches for the 4G cell based on the frequency in the release message and initiates random access, and then completes the VOLTE call process.

[0170] refer to Figure 2 ,Since the network data plane traffic of 5G communication system is several times or even dozens of times that of 4G communication system, but there are few users in newly built 5G networks, operators hope that 5G users' terminals can quickly return to 5G communication system after completing voice calls in 4G communication system, that is, fast return to 5G strategy, which can also be divided into two modes: switching and redirection. Among them, the switching mode is generally implemented by B1 event (LTE heterogeneous system measurement), and the redirection mode is generally implemented by A2 event (heterogeneous system redirection measurement).

[0171] However, when the fast return to 5G strategy is concurrent with the EPSFB process, the EPSFB process will not be completed and the terminal will return to the 5G communication system prematurely.

[0172] Figure 3 Schematic diagram of the EPSFB process based on switching in the embodiment of the present application, such as Figure 3 As shown in Figure 1, after the calling terminal initiates a voice call, the calling terminal completes the B1 measurement report from the 5G communication system to the 4G communication system and performs the handover from the 5G communication system to the 4G communication system. After the handover is completed, the 4G base station will directly configure the B1 or blind redirection A2 measurement time (refer to Figure 3 In the example above, the 4G base station sends an RRC (Radio Resource Control) reconfiguration message to the calling terminal. At this time, if the calling terminal is in a location with a good 5G signal or a poor 4G signal, the calling terminal will report the B1 or A2 measurement report at a faster speed (reference Figure 3 At this time, if the QCI1 bearer has not been established, the 4G base station will directly trigger the operation of switching the calling terminal from the 4G communication system to the 5G communication system. In this case, the user cannot establish a QCI1 bearer in the 4G communication system, and after returning to the 5G communication system, the 5G core network will no longer initiate the establishment of 5QI1, which ultimately leads to the failure of the voice call and the user cannot make a voice call, thereby reducing the user experience.

[0173] For the EPSFB scenario based on switching, in the existing 38.413 and 36.413 protocol standards, during the switching preparation process from the 5G communication system to the 4G communication system, the Source eNB To Target eNBTransparent Container (source eNB to target eNB transmission container) structure sent by the source 5G base station to the 4G base station defines IMS Voice EPSFallback From 5G IE (Information Element), which is an information element indicating the IMS Voice Evolved Packet System fallback or inter-system fallback trigger, wherein the source eNB is a 5G base station and the target eNB is a 4G base station. However, this IE is optional and there is no requirement to carry it. Currently, the 5G base station does not carry this IE in the Container structure. Therefore, for the terminal that switches from the 5G communication system to the 4G communication system, the 4G base station cannot determine whether the terminal is switched based on data services or EPSFB scenarios. In other words, the 4G base station cannot distinguish the reason why the terminal switches to the 4G communication system. Due to the existence of the fast return to 5G strategy, the 4G communication system will configure the B1 measurement event that is easier to meet and the A2 measurement event of blind redirection, which leads to the problem of voice call failure in the EPSFB scenario based on switching in the prior art.

[0174] Figure 4 Schematic diagram of the EPSFB process based on redirection in the embodiment of the present application, such as Figure 4 As shown, after the calling terminal accesses the 4G base station through redirection, the 4G base station will directly configure the A2 or B1 measurement event of blind redirection for the calling terminal. If the calling terminal is in a position with good 5G signal or poor 4G signal, the calling terminal will report the B1 or A2 measurement report at a faster speed. At this time, if the QCI1 bearer has not been established, the 4G base station will directly trigger the operation of switching the calling terminal from the 4G communication system to the 5G communication system. In this case, the user cannot establish a QCI1 bearer in the 4G communication system, and after returning to the 5G communication system, the 5G core network will no longer initiate the establishment of 5QI1, which will eventually lead to the failure of the voice call.

[0175] For the EPSFB scenario based on redirection, in the existing 36.413 protocol standard, the Initial Context Setup Request message sent by the MME (Mobility Management Entity) in the 4G core network to the 4G base station does not carry the IMS Voice EPS Fallback From 5GIE. That is to say, when a terminal redirected to the 4G communication system accesses the 4G base station, the 4G base station cannot determine whether the terminal initially accesses the 4G communication system or falls back to the 4G communication system by EPSFB. Due to the existence of the fast return to 5G strategy, the 4G base station will configure the A2 measurement event or B1 measurement event of blind redirection, which results in the problem of voice call failure in the prior art in the EPSFB scenario based on redirection.

[0176] The optimization method, device, network equipment, medium and product of the voice call process provided in this application are intended to solve the above technical problems of the prior art.

[0177] The main idea of ​​the present application is: when the terminal falls back from the 5G communication system to the 4G communication system due to a voice call service, the 5G communication system can send indication information that the terminal is a voice fallback terminal to the 4G communication system (for example, it can be IMSVoice EPS Fallback From 5G IE). After receiving the indication information, the 4G communication system determines that the terminal falls back to the 4G communication system due to the voice call service. Therefore, after the terminal falls back to the 4G communication system, the 4G communication system does not perform relevant measurement configuration of the 5G communication system, thereby ensuring the normal progress of the EPSFB process, and then ensuring that the terminal can make voice calls in the 4G communication system.

[0178] Specifically, for the EPSFB process based on switching, through the switching preparation process, the 5G base station transmits the IMS Voice EPSFallback From 5G IE to the 4G base station. The 4G base station can determine whether the terminal switched from the 5G communication system is a voice fallback terminal based on the IE. If so, the relevant measurement configuration of the 5G communication system is not configured temporarily. After the terminal voice call is over, the relevant measurement configuration of the 5G communication system is configured, so as to achieve the purpose of quickly returning to 5G. To achieve the above purpose, it is necessary to modify the IMS Voice EPS Fallback From 5G IE carrying condition in the Source eNB To Target eNB Transparent Container (source eNB to target eNB transmission container) structure in the 36.413 protocol to C-ifforEPSFB, which means that if the purpose is to implement the EPSFB process, the IE is carried.

[0179] For the EPSFB process based on redirection, after the terminal initiates access to the 4G communication system, the 4G core network obtains the context of the terminal from the 5G core network. In the context response message, the 4G core network obtains whether the terminal is a voice fallback terminal. If so, the 4G core network carries the IMS Voice EPSFallback From 5G IE in the initial context establishment request message sent to the 4G base station, and the 4G base station does not configure the terminal with the mobility measurement configuration of the 5G communication system; after the terminal voice call ends, the relevant measurement configuration of the 5G communication system is configured to achieve the purpose of quickly returning to 5G. In order to achieve the above purpose, it is necessary to add the IMS Voice EPS Fallback From 5G IE to the context response message in the 29.274 protocol, and at the same time, add the IMS Voice EPS Fallback From 5G IE to the initial context establishment request (Initial Context Setup Request) message in the 36.413 protocol.

[0180] 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.

[0181] In some embodiments, a method for optimizing a voice call process is provided, which is applied to a 5G base station and to a switching-based EPSFB scenario.

[0182] Figure 5Schematic diagram of the optimization method for the voice call process applied to the 5G base station in the embodiment of the present application, such as Figure 5 As shown, the method comprises the following steps:

[0183] A3. The 5G base station determines whether the terminal UE to be switched is in the evolved packet system fallback EPSFB state, and generates a switching request message based on the judgment result.

[0184] Among them, when the 5G base station determines that the UE is in the EPSFB state, the switching request message includes voice fallback indication information used to characterize that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service; in addition, if the 5G base station determines that the UE is not in the EPSFB state, the switching request message does not include the voice fallback indication information, and the voice fallback indication message can be, for example, the IMS Voice EPS Fallback From 5G IE in the aforementioned content. Therefore, the switching request message including the voice fallback indication message can indicate that the UE falls back from the 5G communication system to the 4G communication system due to the need for voice call service.

[0185] A4. The 5G base station sends a handover request message to the 5G core network;

[0186] A5. The 5G base station receives a handover command message sent by the 5G core network;

[0187] A6. The 5G base station sends a switching command to the UE. The switching command is used to instruct the UE to perform a switch from the 5G communication system to the 4G communication system, that is, to instruct the UE to switch out from NR. After receiving the switching command, the UE performs a switch from NR to LTE.

[0188] This embodiment provides a method for optimizing a voice call process. When a terminal falls back from a 5G communication system to a 4G communication system due to a voice call service, a 5G base station sends a switching request message containing voice fallback indication information to a 5G core network. When the 5G core network communicates with the 4G communication system, it can send the voice fallback indication information to the 4G communication system. After receiving the indication information, the 4G communication system determines that the terminal falls back to the 4G communication system due to a voice service. Therefore, after the terminal switches to the 4G communication system, the 4G communication system does not perform relevant measurement configurations of the 5G communication system, thereby ensuring the normal progress of the EPSFB process, and further ensuring that the terminal can make voice calls in the 4G communication system.

[0189] In some embodiments, reference Figure 5 Before the step of determining whether the terminal UE to be switched is in the evolved packet system fallback EPSFB state, the method further includes:

[0190] A1. When the UE accesses the 5G base station and is in a connected state, the 5G base station receives the 4G communication system measurement information sent by the UE. During this process, the UE measures the 4G communication system and uploads the measurement report to the 5G base station.

[0191] A2. The 5G base station performs handover preparation processing for the UE to switch between communication systems based on the 4G communication system measurement information. In this process, the 5G base station searches for the 4G communication system neighboring cell based on the 4G communication system measurement report uploaded by the UE, and performs the handover preparation process for switching to the 4G communication system.

[0192] It can be understood that after the 5G base station determines that the switching preparation is completed, step A3 is started, that is, determining whether the UE is in the EPSFB state.

[0193] Figure 6 Schematic diagram of a 5G base station determining whether a UE is in an EPSFB state in an embodiment of the present application, such as Figure 6 As shown, the processing process includes:

[0194] A31. The 5G base station receives the protocol data unit PDU modification request message sent by the 5G core network and establishes the 5G service quality identifier 5QI1. During this process, the 5G base station receives the PDU modification request triggered by the 5G core network and carries the establishment of 5QI1.

[0195] A32, the 5G base station determines whether it supports the 5G voice service VONR of the 5G communication system;

[0196] A33. If not supported, the 5G base station sends a PDU modification failure message to the 5G core network and determines that the UE enters the EPSFB state, where the PDU modification failure message includes voice fallback indication information. If the 5G base station does not support the VONR service, it means that the UE needs to fall back to the 4G communication system for voice calls.

[0197] Therefore, through the above processing process, the 5G base station can determine whether the UE is in the EPSFB state, and thus determine whether the switching request message sent to the 5G core network needs to include voice fallback indication information.

[0198] In some embodiments, reference Figure 6 , the method further comprises:

[0199] A34. If the 5G base station supports VONR services, the 5G base station establishes a 5QI1 bearer and sends a PDU modification success message to the 5G core network. The 5QI1 bearer is used to implement voice calls of UE in the 5G communication system.

[0200] Therefore, if the 5G base station supports VONR services, after establishing the 5QI1 bearer, the UE can complete voice calls through the VONR service based on the 5QI1 bearer.

[0201] In some embodiments, a method for optimizing a voice call process is provided, which is applied to a 4G base station. The method can be applied to a handover-based or redirection-based EPSFB scenario.

[0202] In this embodiment, the method includes:

[0203] Receiving a communication message sent by the 4G core network to indicate that the UE is communicating from the 5G communication system to the 4G communication system;

[0204] Determine whether the communication message includes voice fallback indication information for indicating that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service;

[0205] If included, the voice fallback indication information is added to the UE context corresponding to the terminal.

[0206] In some embodiments, for a switching-based EPSFB scenario, the communication message includes a switching request message for characterizing that the UE switches from a 5G communication system to a 4G communication system.

[0207] In some embodiments, for the redirection-based EPSFB scenario, the communication message includes an initial context establishment request message sent by the 4G core network to the 4G base station after receiving a non-access layer NAS message of the UE sent by the 4G base station.

[0208] The following is a detailed description of the above method applied to 4G base stations based on the EPSFB scenario based on handover or redirection. Figure 7 and Figure 8 , EPSFB scene reference based on redirection Fig.11 In this application, each embodiment is categorized and described in two implementation modes: switching and redirection.

[0209] In some embodiments, a method for optimizing a voice call process is provided, which is applied to a 4G base station and to a switching-based EPSFB scenario.

[0210] Figure 7 Schematic diagram of the optimization method for the voice call process applied to the 4G base station in the embodiment of the present application, such as Figure 7 As shown, the method comprises the following steps:

[0211] B1. The 4G base station receives a handover request message sent by the 4G core network, and the handover request message is used to indicate that the UE is switched from the 5G communication system to the 4G communication system. In this process, the 4G base station receives a handover request (HandoverRequest) message sent by the 4G core network, that is, it receives a triggering S1 interface (the interface between the 4G base station and the MME) or an inter-system handover request, and the handover type Handover Type carried in the Handover Request message is switching from the 5G communication system to the 4G communication system.

[0212] B5. The 4G base station determines whether the handover request message contains voice fallback indication information used to indicate that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service, that is, determines whether the Source eNB To Target eNB Transparent Container IE in the Handover Request message carries the IMS Voice EPSFallback From 5G IE;

[0213] B6. If included, the 4G base station adds voice fallback indication information in the UE context corresponding to the terminal to indicate that the UE falls back to the 4G communication system due to EPSFB voice service.

[0214] This embodiment provides a method for optimizing the voice call process. When the terminal falls back from the 5G communication system to the 4G communication system due to a voice call service, the 4G base station determines whether the switching request message contains the voice fallback indication information from the 5G communication system to the 4G communication system when receiving the switching request message sent by the 4G core network. If it contains, it is determined that the terminal falls back to the 4G communication system due to the voice service, and the indication message is added to the UE context. Therefore, after the terminal switches to the 4G communication system, due to the existence of the voice fallback indication message, the 4G communication system does not perform the relevant measurement configuration of the 5G communication system, thereby ensuring the normal progress of the EPSFB process, and further ensuring that the terminal can make a voice call in the 4G communication system.

[0215] In some embodiments, reference Figure 7 The method also includes: B7. After the UE switches from the 5G communication system to the 4G communication system, the 4G base station configures the mobility measurement configuration within the 4G communication system for the UE.

[0216] In this embodiment, the UE switches from the 5G communication system to the 4G communication system, which means that the UE accesses the 4G communication system. After the terminal switches to the 4G communication system, when the 4G base station determines that the UE falls back to the 4G communication system due to voice service, only the relevant measurement configuration in the 4G communication system is performed, and the relevant measurement configuration of the 5G communication system is not performed, thereby ensuring the normal progress of the EPSFB process, and further ensuring that the terminal can make voice calls in the 4G communication system.

[0217] In some embodiments, reference Figure 7 The method also includes: B61. If the switching request message does not include voice fallback indication information, after the UE switches from the 5G communication system to the 4G communication system, the 4G base station configures the mobility measurement configuration within the 4G communication system and the mobility measurement configuration between the 5G communication system and the 4G communication system for the UE.

[0218] In this embodiment, after the terminal switches to the 4G communication system, when the 4G base station determines that the UE does not fall back to the 4G communication system due to voice services, relevant measurement configurations of the 4G communication system and the 5G communication system are performed simultaneously, thereby providing good wireless resources for the UE.

[0219] In some embodiments, reference Figure 7 After receiving the handover request message sent by the 4G core network, before determining whether the handover request message includes voice fallback indication information, the method further includes:

[0220] B2. The 4G base station determines whether the handover preparation for implementing the handover of the UE is completed;

[0221] B3. If completed, the 4G base station sends a handover request confirmation message to the 4G core network. Thus, when the handover preparation is completed, the UE can switch the communication system.

[0222] In some embodiments, determining whether switching preparation for implementing communication system switching of the UE is completed includes: the 4G base station determines whether the switching preparation is completed based on target cell information, 4G base station resources and the public land mobile network PLMN (Public Land Mobile Network) of the UE.

[0223] Specifically, if the target cell exists in the 4G base station, the user's PLMN is consistent with the PLMN of the target cell, and the resources in the 4G base station meet the requirements, the switching preparation is determined to be completed; otherwise, the switching preparation is determined to have failed.

[0224] In some embodiments, reference Figure 7The method further includes: B4, if the 4G base station determines that the handover preparation is not completed, sending a handover preparation failure message to the 4G core network. Thus, if the handover preparation is not completed, the UE does not switch the communication system.

[0225] In some embodiments, reference Figure 7 , the method further comprises:

[0226] B8. After the UE switches from the 5G communication system to the 4G communication system, the 4G base station establishes a 4G service quality level identification QCI1 bearer, and the QCI1 bearer is used to implement the UE's voice call in the 4G communication system; thus, by establishing the QCI1 bearer, the terminal can make a voice call in the 4G communication system.

[0227] B9. After the call is completed, if it is confirmed that the QCI1 bearer is deleted, the 4G base station determines whether it is necessary to quickly return to the 5G communication system and performs corresponding processing based on the judgment result.

[0228] Figure 8 This is a schematic diagram of a 4G base station confirming the deletion of a QCI1 bearer in an embodiment of the present application, determining whether it is necessary to quickly return to the 5G communication system, and performing corresponding processing based on the determination result, as shown in FIG. Figure 8 As shown, the processing process includes:

[0229] B91, the 4G base station receives an E-UTRAN (Evolved Universal Terrestrial Radio Access Network) radio access bearer E-RAB (Evolved Universal Terrestrial Radio Access Network) modification request sent by the 4G core network, where the E-RAB modification request includes a QCI1 bearer deletion indication;

[0230] The 4G base station confirms the deletion of the QCI1 bearer according to the deletion instruction.

[0231] B92, the 4G base station determines whether the UE context contains voice fallback indication information;

[0232] B93. If included, the 4G base station configures the UE to delete the QCI1 bearer and performs measurement configuration for quickly returning to the 5G communication system; wherein the measurement configuration for quickly returning to the 5G communication system includes the B1 measurement event of the 5G communication system or the blind redirection A2 measurement event.

[0233] B94. If not included, the 4G base station only configures the UE to delete the QCI1 bearer.

[0234] Therefore, when the UE context contains voice fallback indication information, it means that the UE has fallen back to the 4G communication system due to the voice call service. After completing the call, the UE needs to return to the 5G communication system as soon as possible. Therefore, measurement configuration for quickly returning to the 5G communication system is performed to ensure that the UE can use the wireless resources of the 5G communication system.

[0235] In some embodiments, a method for optimizing a voice call process is provided, which is applied to a 5G core network and to a redirection-based EPSFB scenario.

[0236] Fig. 9 Schematic diagram of the optimization method for the voice call process applied to the 5G core network in the embodiment of the present application, such as Fig. 9 As shown, the method comprises the following steps:

[0237] C1. The 5G core network receives a UE context release request message sent by the 5G base station;

[0238] C2. The 5G core network determines whether the UE context release request message includes voice fallback indication information used to indicate that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service;

[0239] C3. If included, the 5G core network adds voice fallback indication information in the context of the UE;

[0240] C4. The 5G core network sends a UE context release command to the 5G base station. The UE context release command is used to instruct the 5G base station to switch the UE to an idle state.

[0241] This embodiment provides a method for optimizing the voice call process. When the terminal falls back from the 5G communication system to the 4G communication system due to a voice call service, the 5G core network determines whether the UE context release request message contains voice fallback indication information after receiving the UE context release request message sent by the 5G base station. If it contains, it is determined that the terminal falls back to the 4G communication system due to the voice service, and the indication message is added to the UE context. Therefore, after the terminal falls back to the 4G communication system, due to the existence of the voice fallback indication message, the 4G communication system does not perform the relevant measurement configuration of the 5G communication system, thereby ensuring the normal progress of the EPSFB process, and further ensuring that the terminal can make a voice call in the 4G communication system.

[0242] In some embodiments, reference Fig. 9 , the method further comprises:

[0243] C5. When the 5G core network receives the UE context request message sent by the 4G core network, it obtains the UE context;

[0244] C6. The 5G core network sends a UE context response message to the 4G core network. The UE context response message includes the UE context, and the UE context includes voice fallback indication information.

[0245] In this embodiment, after receiving the UE context request message sent by the 4G core network, the 5G core network sends a UE context response message containing voice fallback indication information to the 4G core network. Therefore, the 4G communication system can determine, based on the voice fallback indication information, that the UE falls back to the 4G communication system due to voice service, and only performs relevant measurement configuration within the 4G communication system, and does not perform relevant measurement configuration of the 5G communication system, thereby ensuring the normal progress of the EPSFB process, and further ensuring that the terminal can make voice calls in the 4G communication system.

[0246] In some embodiments, reference Fig. 9 , the method further comprises:

[0247] C31. If the UE context release request message does not include a voice fallback indication message, the 5G core network does not add voice fallback indication information to the UE context, and sends a UE context release command to the 5G base station. In this process, since the UE context release request message does not include a voice fallback indication message, it can be determined that the UE does not fall back to the 4G communication system due to voice call service, but rather due to other reasons for communication system optimization. Therefore, the 5G core network does not add voice fallback indication information to the UE context.

[0248] C32. When the 5G core network receives the UE context request message sent by the 4G core network, the 5G core network obtains the UE context;

[0249] C33, the 5G core network sends a UE context response message to the 4G core network. The UE context response message includes the UE context, and the UE context does not include the voice fallback indication information. In this process, since the UE context release request message does not include the voice fallback indication message, it can be known that the UE does not fall back to the 4G communication system due to voice call service, but due to other reasons for communication system optimization. Therefore, the UE context sent by the 5G core network to the 4G core network does not include the voice fallback indication information.

[0250] In some embodiments, a method for optimizing a voice call process is provided, which is applied to a 4G core network and to a redirection-based EPSFB scenario.

[0251] Fig.10 Schematic diagram of the optimization method for the voice call process applied to the 4G core network in the embodiment of the present application, such as Fig.10 As shown, the method comprises the following steps:

[0252] D3. The 4G core network sends a UE context request message to the 5G core network. In this process, the UE context request message sent by the 4G core network to the 5G core network corresponds to the UE context request message from the 4G core network received by the 5G core network in step C5 of the aforementioned embodiment.

[0253] D4. The 4G core network receives the UE context response message sent by the 5G core network. In this process, the UE context response message received by the 4G core network from the 5G core network corresponds to the UE context response message sent by the 5G core network to the 4G core network in step C6 of the aforementioned embodiment.

[0254] D5. The 4G core network determines whether the UE context response message includes voice fallback indication information used to indicate that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service;

[0255] D6. If included, the 4G core network sends an initial context establishment request message to the 4G base station, and the initial context establishment request message includes voice fallback indication information.

[0256] This embodiment provides a method for optimizing a voice call process. When a terminal falls back from a 5G communication system to a 4G communication system due to a voice call service, the 5G core network sends a UE context response message containing voice fallback indication information to the 4G core network after receiving a UE context request message sent by the 4G core network. Thus, the 4G core network can determine whether the terminal falls back from a 5G communication system to a 4G communication system due to a voice call service by judging whether the UE context response message contains the voice fallback indication information. Thus, when the voice fallback indication information is included, the 4G core network sends an initial context establishment request message containing the voice fallback indication information to the 4G base station. After the terminal accesses the 4G communication system, due to the existence of the voice fallback indication message, the 4G communication system does not perform relevant measurement configurations of the 5G communication system, thereby ensuring the normal progress of the EPSFB process, and further ensuring that the terminal can make a voice call in the 4G communication system.

[0257] In some embodiments, reference Fig.10 , the method further comprises:

[0258] D1. The 4G core network receives a Tracking Area Update (TAU) request message sent by the UE. The TAU request message includes the UE's globally unique temporary identifier (GUTI).

[0259] D2. The 4G core network determines the corresponding access and mobility management function AMF (Access And Mobility Management Function) of the UE in the 5G communication system based on the GUTI. Since the GUTI carried by the terminal in the TAU request is mapped according to the 5G-S-TMSI (5G System Temporary Mobile Subscriber Identity) at the time of 5G registration, the MME in the 4G core network can find the AMF of the terminal at the time of 5G registration based on the GUTI.

[0260] Correspondingly, a UE context request message is sent to the 5G core network, including: the 4G core network sends a UE context request message to the AMF corresponding to the UE.

[0261] In some embodiments, reference Fig.10 , the method further comprises:

[0262] D61. If the UE context response message does not include a voice fallback indication message, the 4G core network sends an initial context establishment request message that does not include a voice fallback indication message to the 4G base station.

[0263] Thus, when the UE context response message does not include the voice fallback indication message, the 4G core network determines that the terminal does not fall back to the 4G communication system due to the voice call service. Therefore, the initial context establishment request message sent by the 4G core network to the 4G base station does not include the voice fallback indication message, so that the 4G base station knows that the terminal does not fall back to the 4G communication system due to the voice call service.

[0264] In some embodiments, a communication system optimization method during a voice call process is provided, which is applied to a 4G base station and to a redirection-based EPSFB scenario.

[0265] Fig.11 Schematic diagram of the optimization method of the voice call process of the communication system optimization method applied to the 4G base station in the embodiment of the present application, such as Fig.11 As shown, the method comprises the following steps:

[0266] E1. When the UE initiates access to the 4G communication system, the 4G base station sends the UE's NAS (Non Access Stratum) message to the 4G core network;

[0267] E2. The 4G base station receives an initial context establishment request message sent by the 4G core network. In this process, the initial context establishment request message received by the 4G base station from the 4G core network corresponds to the initial context establishment request message sent by the 4G core network to the 4G base station in step D6 of the aforementioned embodiment;

[0268] E3. The 4G base station determines whether the initial context establishment request message includes voice fallback indication information used to indicate that the UE is accessed from the 5G communication system to the 4G communication system based on the voice call service;

[0269] E4. If included, the 4G base station adds voice fallback indication information in the context of the UE.

[0270] This embodiment provides a method for optimizing a voice call process in a communication system optimization method. When a terminal falls back from a 5G communication system to a 4G communication system due to a voice call service, the UE context response message received by the 4G core network from the 5G core network includes voice fallback indication information, and the initial context establishment request message sent by the 4G core network to the 4G base station also includes voice fallback indication information. Therefore, the 4G base station can determine whether the terminal falls back from the 5G communication system to the 4G communication system due to a voice call service by judging whether the initial context establishment request message includes voice fallback indication information. After the terminal is connected to the 4G communication system, due to the existence of the voice fallback indication message, the 4G communication system does not perform relevant measurement configurations of the 5G communication system, thereby ensuring the normal progress of the EPSFB process, and further ensuring that the terminal can make voice calls in the 4G communication system.

[0271] In some embodiments, reference Fig.11 The method also includes: E5. After the UE accesses the 4G communication system, the 4G base station configures the mobility measurement configuration within the 4G communication system for the UE.

[0272] In this embodiment, after the terminal accesses the 4G communication system in a redirected manner, when the 4G base station determines that the UE falls back to the 4G communication system due to voice service, only relevant measurement configuration within the 4G communication system is performed, and relevant measurement configuration of the 5G communication system is not performed, thereby ensuring the normal progress of the EPSFB process and further ensuring that the terminal can make voice calls in the 4G communication system.

[0273] In some embodiments, reference Fig.11 , the method further comprises:

[0274] E6. After the UE accesses the 4G communication system, the 4G base station establishes a QCI1 bearer, which is used to implement voice calls of the UE in the 4G communication system. Thus, by establishing the QCI1 bearer, the terminal can make voice calls in the 4G communication system.

[0275] E7. After the call is completed, if it is confirmed to delete the QCI1 bearer, the 4G base station determines whether it needs to quickly return to the 5G communication system and performs corresponding processing based on the judgment result. The processing of this step can refer to Figure 8 shown.

[0276] In some embodiments, determining whether it is necessary to quickly return to the 5G communication system and performing corresponding processing based on the determination result include:

[0277] E71. The 4G base station determines whether the UE context contains voice fallback indication information;

[0278] E72. If included, the 4G base station performs configuration for the UE to delete the QCI1 bearer and performs measurement configuration for quickly returning to the 5G communication system;

[0279] E73. If not included, the 4G base station deletes the QCI1 bearer configuration for the UE.

[0280] Therefore, when the UE context contains voice fallback indication information, it means that the UE has fallen back to the 4G communication system due to the voice call service. After completing the call, the UE needs to return to the 5G communication system as soon as possible. Therefore, measurement configuration for quickly returning to the 5G communication system is performed to ensure that the UE can use the wireless resources of the 5G communication system.

[0281] In some embodiments, reference Fig.11 , the method further comprises:

[0282] E41. If the initial context establishment request message does not include voice fallback indication information, after the UE accesses the 4G communication system, the 4G base station configures the mobility measurement configuration within the 4G communication system and the mobility measurement configuration between the 5G communication system and the 4G communication system for the UE.

[0283] In this embodiment, after the terminal accesses the 4G communication system, when the 4G base station determines that the UE does not fall back to the 4G communication system due to voice services, relevant measurement configurations of the 4G communication system and the 5G communication system are performed simultaneously, thereby providing good wireless resources for the UE.

[0284] It should be understood that, although the various steps in the flowcharts in the above-described embodiments are sequentially displayed according to the indications of the arrows, these steps are not necessarily executed sequentially in the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps is not strictly limited in order, and they can be executed in other orders. Moreover, at least a portion of the steps in the figure may include a plurality of sub-steps or a plurality of stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and their execution order is not necessarily to be carried out sequentially, but can be executed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

[0285] In some embodiments, a network device is provided, the network device being a 5G base station, Fig.12 is a schematic diagram of a network device in an embodiment of the present application, such as Fig.12 As shown, the network device includes a memory 11 , a transceiver 12 , and a processor 13 .

[0286] The memory is used to store the computer program; the transceiver is used to send and receive data under the control of the processor; the processor is used to read the computer program in the memory and perform the following operations:

[0287] Determine whether the terminal UE to be switched is in the evolved packet system fallback EPSFB state, and generate a switching request message based on the judgment result, wherein when the UE is in the EPSFB state, the switching request message includes voice fallback indication information used to characterize that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service; send a switching request message to the 5G core network; receive a switching command message sent by the 5G core network; send a switching command to the UE, and the switching command is used to instruct the UE to execute a switch from the 5G communication system to the 4G communication system.

[0288] In some embodiments, the processor is also used to perform the following operations: when the UE accesses a 5G base station and the UE is in a connected state, receiving 4G communication system measurement information sent by the UE; and performing switching preparation processing for the UE to switch between communication systems based on the 4G communication system measurement information.

[0289] In some embodiments, the processor is also used to perform the following operations: receive a protocol data unit PDU modification request message sent by the 5G core network, and establish a 5G service quality identifier 5QI1; determine whether the 5G base station supports the 5G voice service VONR of the 5G communication system; if not, send a PDU modification failure message to the 5G core network, and determine that the UE enters the EPSFB state, wherein the PDU modification failure message includes voice fallback indication information.

[0290] In some embodiments, the processor is also used to perform the following operations: if the 5G base station supports the VONR service, a 5QI1 bearer is established, and a PDU modification success message is sent to the 5G core network, wherein the 5QI1 bearer is used to implement voice calls of the UE in the 5G communication system.

[0291] In some embodiments, a network device is provided, the network device is a 4G base station, and the specific structure of the network device can refer to Fig.12 As shown in the schematic diagram, the network device includes a memory, a transceiver, and a processor:

[0292] A memory for storing a computer program; a transceiver for transmitting and receiving data under the control of a processor; and a processor for reading the computer program in the memory and performing the following operations:

[0293] Receive a communication message sent by the 4G core network to characterize that the UE has fallen back from the 5G communication system to the 4G communication system; determine whether the communication message contains voice fallback indication information used to characterize that the UE has fallen back from the 5G communication system to the 4G communication system based on a voice call service; if contained, add the voice fallback indication information in the UE context corresponding to the terminal.

[0294] In some embodiments, the communication message includes a switching request message used to characterize the switching of the UE from a 5G communication system to a 4G communication system.

[0295] In some embodiments, the communication message includes an initial context establishment request message sent by the 4G core network to the 4G base station after receiving a non-access layer NAS message of the UE sent by the 4G base station.

[0296] In some embodiments, the processor is further configured to perform the following operations: after the UE accesses the 4G communication system, configure a mobility measurement configuration within the 4G communication system for the UE.

[0297] In some embodiments, the processor is also used to perform the following operations: if the switching request message does not include voice fallback indication information, after the UE accesses the 4G communication system, the mobility measurement configuration within the 4G communication system and the mobility measurement configuration between the 5G communication system and the 4G communication system are configured for the UE.

[0298] In some embodiments, the processor is further used to perform the following operations: determine whether the switching preparation for implementing the UE to switch the communication system is completed; if completed, send a switching request confirmation message to the 4G core network.

[0299] In some embodiments, the processor is further configured to perform the following operations: determine whether handover preparation is completed based on target cell information, 4G base station resources, and a public land mobile network PLMN of the UE.

[0300] In some embodiments, the processor is further used to perform the following operations: if it is determined that the switching preparation is not completed, a switching preparation failure message is sent to the 4G core network.

[0301] In some embodiments, the processor is also used to perform the following operations: after the UE accesses the 4G communication system, a 4G service quality level identifier QCI1 bearer is established, and the QCI1 bearer is used to implement the UE's voice call in the 4G communication system; after the call is completed, if it is confirmed to delete the QCI1 bearer, it is determined whether it is necessary to quickly return to the 5G communication system, and corresponding processing is performed based on the determination result.

[0302] In some embodiments, the processor is also used to perform the following operations: determine whether the UE context contains voice fallback indication information; if so, configure the UE to delete the QCI1 bearer and perform measurement configuration for quickly returning to the 5G communication system; if not, configure the UE to delete the QCI1 bearer.

[0303] In some embodiments, a network device is provided, the network device is a 5G core network, and the specific structure of the network device can refer to Fig.12 As shown in the schematic diagram, the network device includes a memory, a transceiver, and a processor:

[0304] A memory for storing a computer program; a transceiver for transmitting and receiving data under the control of a processor; and a processor for reading the computer program in the memory and performing the following operations:

[0305] Receive a UE context release request message sent by a 5G base station; determine whether the UE context release request message contains voice fallback indication information used to characterize that the UE falls back from the 5G communication system to the 4G communication system based on a voice call service; if contained, add the voice fallback indication information to the UE context; send a UE context release command to the 5G base station, and the UE context release command is used to instruct the 5G base station to switch the UE to an idle state.

[0306] In some embodiments, the processor is also used to perform the following operations: upon receiving a UE context request message sent by the 4G core network, obtaining the UE context; sending a UE context response message to the 4G core network, the UE context response message includes the UE context, and the UE context includes voice fallback indication information.

[0307] In some embodiments, the processor is also used to perform the following operations: if the UE context release request message does not include a voice fallback indication message, then the voice fallback indication information is not added to the UE context, and a UE context release command is sent to the 5G base station; upon receiving the UE context request message sent by the 4G core network, the UE context is obtained, and a UE context response message is sent to the 4G core network, the UE context response message includes the UE context, and the UE context does not include the voice fallback indication information.

[0308] In some embodiments, a network device is provided, the network device is a 4G core network, and the structure of the network device can refer to Fig.12 As shown in the schematic diagram, the network device includes a memory, a transceiver, and a processor:

[0309] A memory for storing a computer program; a transceiver for transmitting and receiving data under the control of a processor; and a processor for reading the computer program in the memory and performing the following operations:

[0310] Send a UE context request message to the 5G core network; receive a UE context response message sent by the 5G core network; determine whether the UE context response message contains voice fallback indication information used to characterize that the UE falls back from the 5G communication system to the 4G communication system based on a voice call service; if contained, send an initial context establishment request message to the 4G base station, and the initial context establishment request message includes the voice fallback indication information.

[0311] In some embodiments, the processor is also used to perform the following operations: receive a tracking area update TAU request message sent by the UE, the TAU request message including the UE's globally unique temporary identifier GUTI; determine the access and mobility management function AMF corresponding to the UE in the 5G communication system based on the GUTI; and send a UE context request message to the AMF corresponding to the UE.

[0312] In some embodiments, the processor is further configured to perform the following operations: if the UE context response message does not include a voice fallback indication message, an initial context establishment request message that does not include a voice fallback indication message is sent to the 4G base station.

[0313] In some embodiments, a device for optimizing a voice call process is provided, which is applied to a 5G base station. Fig.13 A schematic diagram of an optimization device for a voice call process provided in an embodiment of the present application, such as Fig.13 As shown, the device comprises:

[0314] The judgment module 21 is used to judge whether the terminal UE to be switched is in the evolved packet system fallback EPSFB state, and generate a switching request message based on the judgment result, wherein when the UE is in the EPSFB state, the switching request message includes voice fallback indication information used to characterize that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service;

[0315] A sending module 22 is used to send a handover request message to the 5G core network;

[0316] The receiving module 23 is used to receive a handover command message sent by the 5G core network;

[0317] The sending module 22 is also used to send a switching command to the UE, where the switching command is used to instruct the UE to perform a switch from the 5G communication system to the 4G communication system.

[0318] In some embodiments, the device also includes a processing module (not shown in the figure), which is used to receive 4G communication system measurement information sent by the UE when the UE accesses a 5G base station and the UE is in a connected state; and execute switching preparation processing for the UE to switch between communication systems according to the 4G communication system measurement information.

[0319] In some embodiments, the processing module is also used to receive a protocol data unit PDU modification request message sent by the 5G core network and establish a 5G service quality identifier 5QI1; determine whether the 5G base station supports the 5G voice service VONR of the 5G communication system; if not, send a PDU modification failure message to the 5G core network and determine that the UE enters the EPSFB state, wherein the PDU modification failure message includes voice fallback indication information.

[0320] In some embodiments, the processing module is also used to establish a 5QI1 bearer and send a PDU modification success message to the 5G core network if the 5G base station supports the VONR service, wherein the 5QI1 bearer is used to implement voice calls of the UE in the 5G communication system.

[0321] For the specific definition of the optimization device for the voice call process, please refer to the definition of the optimization method for the voice call process applied to the 5G base station above, which will not be repeated here. Each module in the above-mentioned optimization device for the voice call process can be implemented in whole or in part by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0322] In some embodiments, a device for optimizing a voice call process is provided, which is applied to a 4G base station. Fig.14A schematic diagram of an optimization device for a voice call process provided in an embodiment of the present application, such as Fig.14 As shown, the device comprises:

[0323] The receiving module 31 is used to receive a communication message sent by the 4G core network to indicate that the UE is communicating from the 5G communication system to the 4G communication system;

[0324] A judgment module 32 is used to judge whether the communication message contains voice fallback indication information used to indicate that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service;

[0325] The processing module 33 is configured to add the voice fallback indication information to the UE context corresponding to the terminal when the communication message includes the voice fallback indication information.

[0326] The communication message includes a switching request message used to indicate that the UE switches from a 5G communication system to a 4G communication system.

[0327] The communication message includes an initial context establishment request message sent by the 4G core network to the 4G base station after receiving a non-access layer NAS message of the UE sent by the 4G base station.

[0328] In some embodiments, the processing module is also used to configure the mobility measurement configuration within the 4G communication system and the mobility measurement configuration between the 5G communication system and the 4G communication system for the UE after the UE accesses the 4G communication system if the request message does not include voice fallback indication information.

[0329] In some embodiments, in the handover scenario, the processing module is further used to determine whether the handover preparation for implementing the UE to switch the communication system is completed; if completed, a handover request confirmation message is sent to the 4G core network; if it is determined that the handover preparation is not completed, a handover preparation failure message is sent to the 4G core network.

[0330] In some embodiments, the processing module is further used to determine whether the handover preparation is completed based on the target cell information, 4G base station resources and the public land mobile network PLMN of the UE.

[0331] In some embodiments, the processing module is further used to configure mobility measurement configuration within the 4G communication system for the UE after the UE accesses the 4G communication system.

[0332] In some embodiments, the processing module is also used to establish a 4G service quality level identification QCI1 bearer after the UE accesses the 4G communication system. The QCI1 bearer is used to implement the UE's voice call in the 4G communication system; after the call is completed, if it is confirmed to delete the QCI1 bearer, it is determined whether it is necessary to quickly return to the 5G communication system, and corresponding processing is performed based on the determination result.

[0333] In some embodiments, the processing module is also used to determine whether the UE context contains voice fallback indication information; if it does, the UE is configured to delete the QCI1 bearer and perform measurement configuration for quickly returning to the 5G communication system; if it does not, the UE is configured to delete the QCI1 bearer.

[0334] For the specific definition of the optimization device for the voice call process, please refer to the definition of the optimization method for the voice call process applied to the 4G base station in the above text, which will not be repeated here. Each module in the above-mentioned optimization device for the voice call process can be implemented in whole or in part by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0335] In some embodiments, a device for optimizing a voice call process is provided, which is applied to a 5G core network. Fig.15 A schematic diagram of an optimization device for a voice call process provided in an embodiment of the present application, such as Fig.15 As shown, the device comprises:

[0336] A receiving module 41 is used to receive a UE context release request message sent by a 5G base station;

[0337] A judgment module 42 is used to judge whether the UE context release request message includes voice fallback indication information used to indicate that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service;

[0338] The processing module 43 is configured to add the voice fallback indication information to the UE context when the UE context release request message includes the voice fallback indication information;

[0339] The sending module 44 is used to send a UE context release command to the 5G base station, and the UE context release command is used to instruct the 5G base station to switch the UE to an idle state.

[0340] In some embodiments, the processing module is also used to obtain the UE context when receiving a UE context request message sent by the 4G core network; send a UE context response message to the 4G core network, the UE context response message includes the UE context, and the UE context includes voice fallback indication information.

[0341] In some embodiments, the processing module is also used for: if the UE context release request message does not include a voice fallback indication message, then the voice fallback indication information is not added to the UE context, and a UE context release command is sent to the 5G base station; when receiving the UE context request message sent by the 4G core network, the UE context is obtained, and a UE context response message is sent to the 4G core network, the UE context response message includes the UE context, and the UE context does not include the voice fallback indication information.

[0342] For the specific definition of the optimization device for the voice call process, please refer to the definition of the optimization method for the voice call process applied to the 5G core network above, which will not be repeated here. Each module in the above-mentioned optimization device for the voice call process can be implemented in whole or in part by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0343] In some embodiments, a device for optimizing a voice call process is provided, which is applied to a 4G core network. Fig.16 A schematic diagram of an optimization device for a voice call process provided in an embodiment of the present application, such as Fig.16 As shown, the device comprises:

[0344] A sending module 51 is used to send a UE context request message to the 5G core network;

[0345] The receiving module 52 is used to receive the UE context response message sent by the 5G core network;

[0346] A judgment module 53 is used to judge whether the UE context response message contains voice fallback indication information used to indicate that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service;

[0347] The sending module 51 is further configured to send an initial context establishment request message to the 4G base station when the UE context response message includes voice fallback indication information, wherein the initial context establishment request message includes voice fallback indication information.

[0348] In some embodiments, the device also includes a processing module (not shown in the figure), which is used to receive a tracking area update TAU request message sent by the UE, the TAU request message includes the UE's globally unique temporary identifier GUTI; determine the access and mobility management function AMF corresponding to the UE in the 5G communication system according to the GUTI; and send a UE context request message to the AMF corresponding to the UE.

[0349] In some embodiments, the processing module is further used to: if the UE context response message does not include a voice fallback indication message, send an initial context establishment request message that does not include a voice fallback indication message to the 4G base station.

[0350] For the specific definition of the optimization device for the voice call process, please refer to the definition of the optimization method for the voice call process applied to the 4G core network in the above text, which will not be repeated here. Each module in the above-mentioned optimization device for the voice call process can be implemented in whole or in part by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0351] In some embodiments, a computer-readable storage medium is provided, in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, they are used to implement the steps of various method embodiments of the present application.

[0352] In some embodiments, a computer program product is provided, including a computer program, which implements the steps of various method embodiments of the present application when executed by a processor.

[0353] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods 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 memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0354] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the application disclosed herein. This application is intended to cover any variations, uses or adaptations of the present disclosure, which follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0355] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A method for optimizing a voice call process, characterized in that: Applied to 4G base stations, including: Receive an initial context establishment request message sent by the 4G core network; the initial context establishment request message is sent by the 4G core network to the 4G base station when it is determined that the UE context response message contains voice fallback indication information for characterizing that the UE is falling back from the 5G communication system to the 4G communication system based on a voice call service; the UE context response message is sent by the 5G core network to the 4G core network in response to the UE context request message sent by the 4G core network; the UE context response message includes a UE context, and the UE context contains the voice fallback indication information; the voice fallback indication information contained in the UE context is added to the UE context when the 5G core network determines that the UE context release request message sent by the 5G base station contains voice fallback indication information for characterizing that the UE is falling back from the 5G communication system to the 4G communication system based on a voice call service; Determine whether the initial context establishment request message includes voice fallback indication information used to indicate that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service; If included, the voice fallback indication information is added to the UE context corresponding to the terminal.

2. The method according to claim 1, characterized in that The initial context establishment request message is sent by the 4G core network to the 4G base station after receiving the non-access layer NAS message of the UE sent by the 4G base station.

3. The method according to claim 1 or 2, characterized in that: Also includes: After the UE accesses the 4G communication system, a mobility measurement configuration within the 4G communication system is configured for the UE.

4. The method according to claim 1 or 2, characterized in that: Also includes: After the UE accesses the 4G communication system, a 4G service quality level identifier QCI1 bearer is established, and the QCI1 bearer is used to implement a voice call conversation of the UE in the 4G communication system; After the call is completed, if it is confirmed to delete the QCI1 bearer, it is determined whether it is necessary to quickly return to the 5G communication system, and corresponding processing is performed based on the determination result.

5. The method according to claim 4, characterized in that The determining whether it is necessary to quickly return to the 5G communication system and performing corresponding processing based on the determination result include: Determine whether the UE context contains voice fallback indication information; If included, the configuration of deleting the QCI1 bearer is performed for the UE, and the measurement configuration of quickly returning to the 5G communication system is performed; If not included, the configuration of deleting the QCI1 bearer is performed for the UE.

6. A method for optimizing a voice call process, characterized in that: Applied to 5G core network, including: Receive a UE context release request message sent by a 5G base station; Determine whether the UE context release request message includes voice fallback indication information used to indicate that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service; If included, add voice fallback indication information to the UE context; sending a UE context release command to the 5G base station, where the UE context release command is used to instruct the 5G base station to switch the UE to an idle state; and further comprising: Upon receiving a UE context request message sent by the 4G core network, obtaining the context of the UE; A UE context response message is sent to the 4G core network, wherein the UE context response message includes a UE context, and the UE context includes the voice fallback indication information, so that the 4G core network determines whether the UE context response message includes the voice fallback indication information, and when the UE context response message includes the voice fallback indication information, an initial context establishment request message is sent to the 4G base station, wherein the initial context establishment request message includes the voice fallback indication information, and the initial context establishment request message is used to enable the 4G base station to add the voice fallback indication information to the context of the UE when determining that the initial context establishment request message includes the voice fallback indication information.

7. The method according to claim 6, characterized in that Also includes: If the UE context release request message does not include the voice fallback indication information, the voice fallback indication information is not added to the UE context, and the UE context release command is sent to the 5G base station; When receiving the UE context request message sent by the 4G core network, the context of the UE is obtained, and a UE context response message is sent to the 4G core network, where the UE context response message includes the UE context, and the UE context does not include the voice fallback indication information.

8. A method for optimizing a voice call process, characterized in that: Applied to 4G core network, including: Send a UE context request message to the 5G core network; Receiving a UE context response message sent by the 5G core network; the UE context response message includes a UE context; Determine whether the UE context response message includes voice fallback indication information used to indicate that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service; If included, sending an initial context establishment request message to the 4G base station, wherein the initial context establishment request message includes the voice fallback indication information, so that when the 4G base station determines that the initial context establishment request message includes the voice fallback indication information, the voice fallback indication information is added to the context of the UE; Among them, the voice fallback indication information included in the UE context response message is added to the UE context by the 5G core network when it determines that the UE context release request message sent by the 5G base station contains voice fallback indication information used to characterize that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service.

9. The method according to claim 8, characterized in that Also includes: Receive a tracking area update TAU request message sent by the UE, where the TAU request message includes the UE's global unique temporary identifier GUTI; Determine the access and mobility management function AMF corresponding to the UE in the 5G communication system according to the GUTI; The sending a UE context request message to the 5G core network includes: Send the UE context request message to the AMF corresponding to the UE.

10. The method according to claim 8 or 9, characterized in that: Also includes: If the UE context response message does not include the voice fallback indication information, an initial context establishment request message that does not include the voice fallback indication information is sent to the 4G base station.

11. A method for optimizing a voice call process, characterized in that: include: The 5G core network receives the UE context release request message sent by the 5G base station; The 5G core network determines whether the UE context release request message includes voice fallback indication information used to indicate that the UE falls back from the 5G communication system to the 4G communication system based on a voice call service; If included, the 5G core network adds voice fallback indication information in the UE context; The 5G core network sends a UE context release command to the 5G base station, where the UE context release command is used to instruct the 5G base station to switch the UE to an idle state; The 4G core network sends a UE context request message to the 5G core network; The 4G core network receives a UE context response message sent by the 5G core network, where the UE context response message includes a UE context, and the UE context includes the voice fallback indication information; The 4G core network determines whether the UE context response message includes voice fallback indication information used to indicate that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service; If included, the 4G core network sends an initial context establishment request message to the 4G base station, and the initial context establishment request message includes the voice fallback indication information; The 4G base station receives an initial context establishment request message sent by the 4G core network; The 4G base station determines whether the initial context establishment request message includes voice fallback indication information used to indicate that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service; If included, the 4G base station adds the voice fallback indication information in the UE context corresponding to the terminal.

12. A network device, characterized in that: The network device includes a memory, a transceiver, and a processor: A memory for storing a computer program; a transceiver for transmitting and receiving data under the control of the processor; and a processor for reading the computer program in the memory and performing the following operations: Receive an initial context establishment request message sent by a 4G core network; the initial context establishment request message is sent by the 4G core network to the 4G base station when it is determined that a UE context response message contains voice fallback indication information for characterizing that the UE falls back from the 5G communication system to the 4G communication system based on a voice call service; the UE context response message is sent by the 5G core network to the 4G core network in response to a UE context request message sent by the 4G core network; the UE context response message includes a UE context, and the UE context contains the voice fallback indication information; the voice fallback indication information contained in the UE context is added to the UE context when the 5G core network determines that a UE context release request message sent by the 5G base station contains voice fallback indication information for characterizing that the UE falls back from the 5G communication system to the 4G communication system based on a voice call service; Determine whether the initial context establishment request message includes voice fallback indication information used to indicate that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service; If included, the voice fallback indication information is added to the UE context corresponding to the terminal.

13. The network device according to claim 12, characterized in that: The initial context establishment request message is sent by the 4G core network to the 4G base station after receiving the non-access layer NAS message of the UE sent by the 4G base station.

14. The network device according to claim 12 or 13, characterized in that: The processor is further configured to perform the following operations: After the UE accesses the 4G communication system, a mobility measurement configuration within the 4G communication system is configured for the UE.

15. The network device according to claim 12 or 13, characterized in that: The processor is further configured to perform the following operations: After the UE accesses the 4G communication system, a 4G service quality level identifier QCI1 bearer is established, and the QCI1 bearer is used to implement a voice call conversation of the UE in the 4G communication system; After the call is completed, if it is confirmed to delete the QCI1 bearer, it is determined whether it is necessary to quickly return to the 5G communication system, and corresponding processing is performed based on the determination result.

16. The network device according to claim 15, characterized in that: The processor is further configured to perform the following operations: Determine whether the UE context contains voice fallback indication information; If included, the configuration of deleting the QCI1 bearer is performed for the UE, and the measurement configuration of quickly returning to the 5G communication system is performed; If not included, the configuration of deleting the QCI1 bearer is performed for the UE.

17. A network device, characterized in that: The network device includes a memory, a transceiver, and a processor: A memory for storing a computer program; a transceiver for transmitting and receiving data under the control of the processor; and a processor for reading the computer program in the memory and performing the following operations: Receive a UE context release request message sent by a 5G base station; Determine whether the UE context release request message includes voice fallback indication information used to indicate that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service; If included, add voice fallback indication information to the UE context; Sending a UE context release command to the 5G base station, where the UE context release command is used to instruct the 5G base station to switch the UE to an idle state; The processor is further configured to perform the following operations: Upon receiving a UE context request message sent by the 4G core network, obtaining the context of the UE; A UE context response message is sent to the 4G core network, wherein the UE context response message includes a UE context, and the UE context includes the voice fallback indication information, so that the 4G core network determines whether the UE context response message includes the voice fallback indication information, and when the UE context response message includes the voice fallback indication information, an initial context establishment request message is sent to the 4G base station, wherein the initial context establishment request message includes the voice fallback indication information, and the initial context establishment request message is used to enable the 4G base station to add the voice fallback indication information to the context of the UE when determining that the initial context establishment request message includes the voice fallback indication information.

18. The network device according to claim 17, characterized in that: The processor is further configured to perform the following operations: If the UE context release request message does not include the voice fallback indication information, the voice fallback indication information is not added to the UE context, and the UE context release command is sent to the 5G base station; When receiving the UE context request message sent by the 4G core network, the context of the UE is obtained, and a UE context response message is sent to the 4G core network, where the UE context response message includes the UE context, and the UE context does not include the voice fallback indication information.

19. A network device, characterized in that: The network device includes a memory, a transceiver, and a processor: A memory for storing a computer program; a transceiver for transmitting and receiving data under the control of the processor; and a processor for reading the computer program in the memory and performing the following operations: Send a UE context request message to the 5G core network; Receiving a UE context response message sent by the 5G core network; the UE context response message includes a UE context; Determine whether the UE context response message includes voice fallback indication information used to indicate that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service; If included, sending an initial context establishment request message to the 4G base station, wherein the initial context establishment request message includes the voice fallback indication information, so that when the 4G base station determines that the initial context establishment request message includes the voice fallback indication information, the voice fallback indication information is added to the context of the UE; Among them, the voice fallback indication information included in the UE context response message is added to the UE context by the 5G core network when it determines that the UE context release request message sent by the 5G base station contains voice fallback indication information used to characterize that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service.

20. The network device according to claim 19, characterized in that: The processor is further configured to perform the following operations: Receive a tracking area update TAU request message sent by the UE, where the TAU request message includes the UE's global unique temporary identifier GUTI; Determine the access and mobility management function AMF corresponding to the UE in the 5G communication system according to the GUTI; Send the UE context request message to the AMF corresponding to the UE.

21. A network system, characterized in that: The network system includes a first network device, a second network device, a third network device and a fourth network device; The first network device receives a UE context release request message sent by the fourth network device; The first network device determines whether the UE context release request message includes voice fallback indication information used to indicate that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service; If included, the first network device adds voice fallback indication information in the context of the UE; The first network device sends a UE context release command to the fourth network device, where the UE context release command is used to instruct the fourth network device to switch the UE to an idle state; The second network device sends a UE context request message to the first network device; The second network device receives a UE context response message sent by the first network device, where the UE context response message includes a UE context, and the UE context includes the voice fallback indication information; The second network device determines whether the UE context response message includes voice fallback indication information used to indicate that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service; If included, the second network device sends an initial context establishment request message to the third network device, where the initial context establishment request message includes the voice fallback indication information; The third network device receives an initial context establishment request message sent by the second network device; The third network device determines whether the initial context establishment request message includes voice fallback indication information used to indicate that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service; If included, the third network device adds the voice fallback indication information in the UE context corresponding to the terminal.

22. A device for optimizing a voice call process, applied to a 4G base station, characterized in that: include: A receiving module, used to receive an initial context establishment request message sent by a 4G core network; The initial context establishment request message is sent by the 4G core network to the 4G base station when the 4G core network determines that the UE context response message contains voice fallback indication information used to characterize that the UE falls back from the 5G communication system to the 4G communication system based on a voice call service; the UE context response message is sent by the 5G core network to the 4G core network in response to the UE context request message sent by the 4G core network; the UE context response message includes a UE context, and the UE context contains the voice fallback indication information; the voice fallback indication information contained in the UE context is added to the UE context when the 5G core network determines that the UE context release request message sent by the 5G base station contains voice fallback indication information used to characterize that the UE falls back from the 5G communication system to the 4G communication system based on a voice call service; A judgment module, used to judge whether the initial context establishment request message contains voice fallback indication information used to indicate that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service; The processing module is used to add the voice fallback indication information to the UE context corresponding to the terminal when the initial context establishment request message includes the voice fallback indication information.

23. A device for optimizing a voice call process, applied to a 5G core network, characterized in that: include: A receiving module, used to receive a UE context release request message sent by a 5G base station; A judgment module, used to judge whether the UE context release request message includes voice fallback indication information used to indicate that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service; A processing module, configured to add voice fallback indication information to the UE context when the UE context release request message includes voice fallback indication information; A sending module, used to send a UE context release command to the 5G base station, where the UE context release command is used to instruct the 5G base station to switch the UE to an idle state; The processing module is further configured to obtain the context of the UE when receiving a UE context request message sent by the 4G core network; A UE context response message is sent to the 4G core network, wherein the UE context response message includes a UE context, and the UE context includes the voice fallback indication information, so that the 4G core network determines whether the UE context response message includes the voice fallback indication information, and when the UE context response message includes the voice fallback indication information, an initial context establishment request message is sent to the 4G base station, wherein the initial context establishment request message includes the voice fallback indication information, and the initial context establishment request message is used to enable the 4G base station to add the voice fallback indication information to the context of the UE when determining that the initial context establishment request message includes the voice fallback indication information.

24. A device for optimizing a voice call process, applied to a 4G core network, characterized in that: include: A sending module, used to send a UE context request message to the 5G core network; A receiving module, used to receive a UE context response message sent by the 5G core network; The UE context response message includes a UE context; A judgment module, used to judge whether the UE context response message includes voice fallback indication information used to indicate that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service; The sending module is further configured to send an initial context establishment request message to the 4G base station when the UE context response message includes the voice fallback indication information, wherein the initial context establishment request message includes the voice fallback indication information, so that the 4G base station adds the voice fallback indication information to the context of the UE when determining that the initial context establishment request message includes the voice fallback indication information; Among them, the voice fallback indication information included in the UE context response message is added to the UE context by the 5G core network when it determines that the UE context release request message sent by the 5G base station contains voice fallback indication information used to characterize that the UE falls back from the 5G communication system to the 4G communication system based on the voice call service.

25. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, they are used to implement the method for optimizing the voice call process as described in any one of claims 1 to 10.

26. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the method for optimizing the voice call process as described in any one of claims 1 to 10 is implemented.

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