Call setup method and electronic device

Abstract

The embodiment of the present application is suitable for the field of communication technology, and provides a call establishment method and an electronic device. The method is applied to the process of establishing a voice service between a terminal device and a first network device, and includes: in the case that the signal strength of a first detected signal between the terminal device and the first network device is less than a first threshold value, if the signal strength of the first detected signal is greater than a second threshold value, suppressing the reporting of a measurement report of a preset prediction event to the first network device, and if the signal strength of the first detected signal is less than or equal to the second threshold value, reporting the measurement report of the preset prediction event to the first network device; wherein the second threshold value is less than the first threshold value, the first threshold value is a threshold value for triggering the terminal device to report the preset prediction event to the first network device, and the preset prediction event is used for the first network device to instruct the terminal device to switch from the first network device to a second network device, so as to ensure the continuity of the voice service.

Description

Call establishment method and electronic device

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on March 22, 2024, with application number 202410342986.4 and application name “Call Establishment Method and Electronic Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of communication technology, and more particularly, to a call establishment method and electronic device. Background Art

[0003] In the early stages of next-generation network technology rollout, there are often issues with signal stability. Therefore, carriers often implement fallback strategies to ensure smooth calls. This fallback strategy involves reverting to the previous generation of network equipment if a call encounters issues using the new generation network equipment, ensuring smooth calls.

[0004] For example, when a terminal device establishes a voice service through a 5G network device, the 5G network device configures an A2 measurement event for the terminal device. The terminal device measures the signal strength of the currently located NR service cell based on the configured A2 measurement event of the 5G network device, and reports the A2 measurement event to the 5G network device when the signal strength of the currently located NR service cell is lower than a preset threshold. Based on the reported A2 measurement event, the 5G network device initiates an evolved packet system fallback (EPS FB), thereby instructing the terminal device to fall back from VoNR to VoLTE to ensure the continuity of the voice service. Summary of the Invention

[0005] The embodiment of the present application provides a call establishment method to improve the continuity of voice services.

[0006] In a first aspect, a call establishment method is provided. The method is applied to a process of establishing a voice service between a terminal device and a first network device, the method comprising:

[0007] When the signal strength of the first detection signal between the terminal device and the first network device is less than the first threshold value;

[0008] If the signal strength of the first detection signal is greater than the second threshold value, suppressing reporting of the measurement report of the preset measurement event to the first network device;

[0009] If the signal strength of the first detection signal is less than or equal to the second threshold value, reporting a measurement report of a preset measurement event to the first network device;

[0010] Among them, the second threshold value is smaller than the first threshold value, and the first threshold value is the threshold value for triggering the terminal device to report a measurement report of a preset measurement event to the first network device. The preset measurement event is used by the first network device to instruct the terminal device to switch from the first network device to the second network device.

[0011] Among them, suppressing reporting of the measurement report of the preset measurement event to the first network device can be understood as not reporting the measurement report of the preset measurement event to the first network device. Specifically, it can be: not generating the measurement report of the preset measurement event and thus not reporting the measurement report of the preset measurement event; or, after generating the measurement report of the preset measurement event, not reporting the measurement report.

[0012] As described in the background technology, during the process of establishing a voice service through a 5G network device by a terminal device, when the signal strength of the currently resident NR service cell is lower than a preset threshold, an A2 measurement event is reported to the 5G network device. Based on the reported A2 measurement event, the 5G network device starts EPS FB and instructs the terminal to fall back from VoNR to VoLTE (i.e., switch from the NR network to the LTE network for voice service). However, compared with establishing a voice service through VoNR, establishing a voice service through the EPS FB process involves more network elements and more complex interactions between network elements. Further considering that the current NR network construction is relatively complete, after analysis and research, it is concluded that: in the aforementioned scenario (such as the reference signal received power of the current NR service cell is less than the preset threshold 1) and in some cases (such as the reference signal received power of the current NR service cell is greater than a newly set threshold 2, and threshold 2 is less than threshold 1), establishing a voice service through the EPS FB process is more likely to fail than continuing to establish a voice service through VoNR.

[0013] The call establishment method provided in an embodiment of the present application is applied to the process of establishing a voice service between a terminal device and a first network device. The method includes: when the signal strength of a first detection signal between the terminal device and the first network device is less than a first threshold value, if the signal strength of the first detection signal is greater than a second threshold value, suppressing the reporting of a measurement report of a preset measurement event to the first network device; if the signal strength of the first detection signal is less than or equal to the second threshold value, reporting a measurement report of the preset measurement event to the first network device; wherein the second threshold value is less than the first threshold value, the first threshold value is a threshold value for triggering the terminal device to report a measurement report of the preset measurement event to the first network device, and the preset measurement event is used by the first network device to instruct the terminal device to switch from the first network device to the second network device. It is understandable that in the early stages of a new network standard, operators typically adopt a more conservative fallback strategy, that is, setting a higher fallback threshold. In this case, when the signal strength of the first detection signal between the terminal device and the first network device is high and can meet the user's voice call needs, the terminal device may execute EPS FB. This will increase the risk of voice service establishment failure caused by EPS FB on the terminal device. The call establishment method provided in the embodiment of the present application, when the signal strength of the first detection signal between the terminal device and the first network device is less than the first threshold value, further determines whether the signal strength of the first detection signal is greater than the second threshold value (lower than the first threshold value), and when the signal strength of the first detection signal is greater than the second threshold value, suppresses reporting a measurement report of a preset measurement event to the first network device. This can avoid the situation where the terminal device executes EPS FB when the signal strength of the first detection signal between the terminal device and the first network device is high and can meet the user's voice call needs, thereby improving the continuity of the voice service. At the same time, only when the signal strength of the first detection signal is less than or equal to the second threshold value, a measurement report of the preset measurement event is reported to the first network device, so that the terminal device can execute EPS. FB, ensuring the continuity of voice services.

[0014] In combination with the first aspect, in certain embodiments of the first aspect, if the signal strength of the first detection signal is greater than the second threshold value, suppressing the reporting of the measurement report of the preset measurement event to the first network device includes: if the signal strength of the first detection signal is greater than the second threshold value, determining whether the terminal device supports the use of the first network device to establish a voice service; if the terminal device supports the establishment of a voice service through the first network device, suppressing the reporting of the measurement report of the preset measurement event to the first network device.

[0015] The call establishment method provided in the embodiment of the present application, in the process of further determining whether the signal strength of the first detection signal is greater than the second threshold value (lower than the first threshold value), will again determine whether the terminal device supports the establishment of voice services through the first network device. Only when the terminal device supports the establishment of voice services through the first network device will the measurement report of the preset measurement event be suppressed from being reported to the first network device. This avoids the situation where the terminal device cannot establish a voice service through the first network device after suppressing the measurement report of the preset measurement event to the first network device, thereby avoiding the situation where the establishment of the voice service fails.

[0016] In combination with the first aspect, in certain embodiments of the first aspect, if the terminal device supports establishing a voice service through the first network device, then suppressing reporting a measurement report of a preset measurement event to the first network device, including: when the terminal device supports establishing a voice service through the first network device, the current terminal device has received an invite message, and the terminal device has not yet sent a 180ringing message, suppressing reporting a measurement report of a preset measurement event to the first network device.

[0017] Among them, the period when the terminal device has received the invite message and has not yet sent the 180ringing message is usually the period when the terminal device establishes the voice service. When the terminal device sends the 180ringing message, the voice service has been successfully established, so there is no need to suppress reporting the measurement event to the first network device.

[0018] In combination with the first aspect, in some embodiments of the first aspect, the signal strength of the first detection signal includes a reference signal received power RSRP.

[0019] In combination with the first aspect, in certain embodiments of the first aspect, if the signal strength of the first detection signal is greater than the second threshold value, suppressing the reporting of the measurement report of the preset measurement event to the first network device includes: if the signal strength of the first detection signal is greater than the second threshold value, suppressing the reporting of the measurement report of the preset measurement event to the first network device, and establishing a voice service through the first network device.

[0020] In the call establishment method provided in the embodiment of the present application, when the signal strength of the first detection signal is greater than the second threshold value, after suppressing the measurement report of the preset measurement event from being reported to the first network device, the first network device will not instruct the terminal device to perform EPS FB, and the terminal device will not fall back to establishing the voice service through the second network device. At this time, since the signal strength of the first detection signal is greater than the second threshold value, the communication quality between the terminal device and the first network device can meet the user's voice call needs, and the terminal device can establish the voice service through the first network device, thereby ensuring the continuity of the voice service.

[0021] In combination with the first aspect, in some embodiments of the first aspect, the first network device is a new radio interface NR device, and the second network device is a long term evolution LTE device.

[0022] In combination with the first aspect, in certain embodiments of the first aspect, the preset measurement event is an A2 measurement event.

[0023] In combination with the first aspect, in certain embodiments of the first aspect, if the signal strength of the first detection signal is less than or equal to the second threshold value, reporting a measurement report of a preset measurement event to the first network device includes: if the signal strength of the first detection signal is less than or equal to the second threshold value, reporting a measurement report of a preset measurement event to the first network device, so that the first network device initiates an evolved packet system fallback EPS FB process based on the preset measurement event.

[0024] In the call establishment method provided in the embodiment of the present application, when the signal strength of the first detection signal is less than or equal to the second threshold value, the signal quality between the terminal device and the first network device is too low to meet the terminal device's need to establish a voice service. At this time, the terminal device and the first network device report a measurement report of a preset measurement event, so that the first network device starts EPS FB based on the preset measurement event, so that the terminal device can fall back to establishing a voice service through the second network device, and further, when the signal strength of the first detection signal is less than or equal to the second threshold value, the continuity of the voice service can still be guaranteed through the second network device.

[0025] In a second aspect, a call establishment device is provided, comprising a unit for executing any of the methods described in the first aspect. The device may be a server, a terminal device, or a chip within the terminal device. The device may include an input unit and a processing unit.

[0026] When the device is a terminal device, the processing unit may be a processor, and the input unit may be a communication interface; the terminal device may also include a memory for storing computer program code, and when the processor executes the computer program code stored in the memory, the terminal device executes any one of the methods in the first aspect.

[0027] When the device is a chip in a terminal device, the processing unit may be a processing unit inside the chip, and the input unit may be an output interface, a pin or a circuit, etc.; the chip may also include a memory, which may be a memory inside the chip (for example, a register, a cache, etc.) or a memory located outside the chip (for example, a read-only memory, a random access memory, etc.); the memory is used to store computer program code, and when the processor executes the computer program code stored in the memory, the chip executes any one of the methods in the first aspect.

[0028] In one possible implementation, a memory is used to store computer program code; a processor executes the computer program code stored in the memory. When the computer program code stored in the memory is executed, the processor is used to perform:

[0029] In a third aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program code. When the computer program code is executed by a call establishment device, the call establishment device executes any one of the call establishment methods in the first aspect.

[0030] In a fourth aspect, a computer program product is provided, comprising: a computer program code, which, when executed by a call establishment device, enables the call establishment device to execute any one of the device methods in the first aspect.

[0031] The call establishment method provided in an embodiment of the present application is applied to a process of establishing a voice service between a terminal device and a first network device. The method includes: when the signal strength of a first detection signal between the terminal device and the first network device is less than a first threshold value, if the signal strength of the first detection signal is greater than a second threshold value, suppressing reporting a measurement report of a preset measurement event to the first network device; if the signal strength of the first detection signal is less than or equal to the second threshold value, reporting a measurement report of the preset measurement event to the first network device; wherein the second threshold value is less than the first threshold value, and the first threshold value is a threshold value for triggering the terminal device to report a measurement report of the preset measurement event to the first network device. The preset measurement event is used by the first network device to instruct the terminal device to switch from the first network device to the second network device. It is understandable that in the early stage of using a new network standard, the operator usually adopts a more conservative fallback strategy, that is, setting a higher fallback threshold. In this case, when the signal strength of the first detection signal between the terminal device and the first network device is high and can meet the user's voice call needs, the terminal device may execute EPS FB, which will cause the terminal device to fail due to EPS. The risk of voice service establishment failure caused by FB increases; the call establishment method provided in the embodiment of the present application further determines whether the signal strength of the first detection signal is greater than a second threshold value (a threshold value lower than the first threshold value) when the signal strength of the first detection signal between the terminal device and the first network device is less than the first threshold value, and suppresses reporting the measurement report of the preset measurement event to the first network device when the signal strength of the first detection signal is greater than the second threshold value. This can avoid the situation where the terminal device executes EPS FB when the signal strength of the first detection signal between the terminal device and the first network device is high and can meet the user's voice call needs, thereby improving the continuity of the voice service. At the same time, only when the signal strength of the first detection signal is less than or equal to the second threshold value, the measurement report of the preset measurement event is reported to the first network device, so that the terminal device can execute EPS FB, so that when the first detection signal between the terminal device and the first network device is low, the continuity of the voice service is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] FIG1 is a schematic diagram of a process of connecting a UE to a 5G network and an LTE network via a wireless network;

[0033] FIG2 is a schematic diagram of a process for a terminal device's voice service to fall back from VoNR to VoLTE;

[0034] FIG3 is a schematic diagram of a network architecture provided in an embodiment of the present application;

[0035] FIG4 is a schematic diagram of an application scenario provided by an embodiment of the present application;

[0036] FIG5 is a flow chart of a call establishment method according to an embodiment of the present application;

[0037] FIG6( a ) is a schematic diagram illustrating the correspondence between reported measurement events and RSRP according to an embodiment of the present application;

[0038] FIG6( b ) is a schematic diagram of a corresponding relationship between an existing reported measurement event and RSRP;

[0039] FIG7 is a schematic diagram of a hardware system of an electronic device applicable to the present application;

[0040] FIG8 is a schematic diagram of a software system of an electronic device applicable to the present application. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings in the embodiments of the present application. In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is merely a description of the association relationship of associated objects, indicating that three relationships can exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0042] In the following, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features indicated. Therefore, a feature specified as "first," "second," or "third" may explicitly or implicitly include one or more of the features.

[0043] To facilitate understanding, some of the examples given are provided for reference to the description of concepts related to the embodiments of the present application.

[0044] 1. Voice over NR (VoNR)

[0045] Voice services based on 5G bearer can be called VoNR.

[0046] 2. Voice over Long-Term Evolution (VoLTE)

[0047] Voice services based on LTE bearer can be called VoLTE.

[0048] 3. Measure and report events.

[0049] When a user equipment (UE) resides in a cell, the network typically configures different measurement events and sends them to the UE. The UE measures the cell signal quality based on the measurement event configuration information and reports the event to the network if the reporting conditions specified in the measurement event configuration information are met. The network then performs corresponding operations based on the event reported by the UE.

[0050] Common monitoring events include:

[0051] Event A1: Event A1 is configured to measure whether the signal strength of the currently camped serving cell is higher than a preset threshold A1, and report event A1 to the network device when the signal strength of the currently camped serving cell is higher than the preset threshold A1. The network device stops measuring the signal strength of the corresponding cell based on the reported event A1.

[0052] Event A2: Event A2 is configured to measure whether the signal strength of the currently serving cell is below a preset threshold A2. If the signal strength of the currently serving cell is below the preset threshold A2, Event A2 is reported to the network device. Based on the reported Event A2, the network device initiates measurement of the corresponding cell's signal strength. Typically, after enabling measurement of the corresponding cell's signal strength, a cell handover operation may be performed.

[0053] Event A3: Event A3 is configured to measure the signal strength of the neighboring cell and the currently serving cell. If the signal strength of the neighboring cell is higher than the signal strength of the currently serving cell, Event A3 is reported to the network device. Based on the reported Event A3, the network device determines whether the UE should be handed over from the currently serving cell to the neighboring cell.

[0054] Event A4: Event A4 is configured to measure whether the signal strength of the neighboring cell is higher than a preset threshold A4. If the signal strength of the neighboring cell is higher than the preset threshold A4, event A4 is reported to the network device.

[0055] Event A5: Event A5 is configured to measure the signal strength of the serving cell and neighboring cells. If the signal strength of the serving cell is less than a preset threshold A51, and the signal strength of the neighboring cell is greater than a preset threshold A52, event A5 is reported to the network device. Preset threshold A51 may be less than preset threshold A52. Based on the reported event A5, the network device determines whether the UE should switch cells.

[0056] In event A6, event A5 is configured to measure the signal strength of the neighbor cell and the secondary cell. If the signal strength of the neighbor cell is higher than that of the secondary cell, event A6 is reported to the network device. Based on the reported event A6, the network device determines whether the UE should be handed over to the cell with higher signal strength.

[0057] Event B1: Event B1 is configured to measure the signal strength of a neighboring cell of a different system. If the signal strength of the neighboring cell of the different system exceeds a preset threshold B1, event B1 is reported to the network device. Based on the reported event B1, the network device determines whether the UE should switch to the different system.

[0058] Event B2: Event B1 is configured to measure the signal strength of the currently serving cell and the heterogeneous neighboring cell. If the signal strength of the currently serving cell is lower than a preset threshold B21, and the signal strength of the heterogeneous neighboring cell is higher than a preset threshold B22, event B2 is reported to the network device. Preset threshold B21 may be lower than preset threshold B22. Based on reported event B2, the network device determines whether the UE should be handed over from the currently serving cell to the heterogeneous neighboring cell.

[0059] 4. Evolved packet system fallback (EPS FB)

[0060] EPS FB refers to the process of falling back from 5G to 4G when the 5G network does not meet the VoNR conditions, and ensuring the continuity of voice services through VoLTE.

[0061] In the early stages of next-generation network technology rollout, there are often issues with signal stability. Therefore, carriers often implement fallback strategies to ensure smooth calls. This fallback strategy involves reverting to the previous generation of network equipment if a call encounters issues using the new generation network equipment, ensuring smooth calls.

[0062] For example, in the early days of using VoNR, the voice service used in the fifth generation mobile communication technology (5G), operators lacked confidence in the VoNR network and therefore adopted a more conservative fallback strategy. For example, when a terminal device is establishing a voice service through a 5G network device, if the signal strength of the currently resident NR service cell is lower than a preset threshold, an A2 measurement event is reported to the 5G network device. Based on the reported A2 measurement event, the 5G network device instructs the terminal device to perform EPS FB (e.g., instructing the terminal device to switch from the 5G network to the 4G network). However, compared with establishing a voice service through VoNR, establishing a voice service through the EPS FB process involves more network elements and the interaction between network elements is more complex. Further considering that the current NR network construction is relatively complete, after analysis, it is concluded that: in the aforementioned scenario (such as the reference signal received power of the current NR service cell is less than the preset threshold 1) and in some cases (such as the reference signal received power of the current NR service cell is greater than a newly set threshold 2, and threshold 2 is less than threshold 1), establishing a voice service through the EPS FB process is more likely to fail than continuing to establish a voice service through VoNR.

[0063] For example, if the preset threshold is -95dBm, and the RSRP measured by the mobile phone between the 5G base station and the mobile phone is -96dBm, the A2 reporting condition is met. After the mobile phone reports the A2 reporting event to the 5G base station, the 5G base station initiates EPS FB. It should be noted that when the RSRP between the 5G base station and the mobile phone is -96dBm, the mobile phone can usually make normal voice calls. In this case, if EPS FB is enabled, establishing a voice service through the EPS FB process involves more network elements than establishing a voice service through VoNR, and the interaction between network elements is more complex, resulting in a higher probability of EPS FB failure, which will affect the user's normal voice calls. In one possible scenario, when the RSRP between the 5G base station (NR) and the mobile phone is -96dBm, the RSRP between the 4G base station (LTE) and the mobile phone is -103dBm. It can be seen that the signal strength between the NR base station and the mobile phone at the current moment is higher than the signal strength between the LTE base station and the mobile phone. At this time, if EPS FB is activated and the mobile phone's voice service is rolled back from VoNR to VoLTE, the user's normal voice call will be affected due to the weak signal strength between the LTE base station and the mobile phone.

[0064] For example, as shown in Figure 1, the UE is connected to the 5G network and the LTE network respectively through a wireless network. The wireless network includes the next generation radio access network (NG-RAN), evolved UTRAN (E-TRAN), access mobility management function (AMF), mobility management entity (MME), serving gateway (SGW), packet data network gateway (PGW) / session management function (SMF) / user plane function (UPF) and IP Multimedia Subsystem (IMS) voice session. The process of voice service falling back from 5G to 4G includes:

[0065] S101. The UE initiates an IMS call or receives an IMS call in the 5G system.

[0066] S102: Start PDU (packet data unit) session modification to establish a QoS flow for IMS voice.

[0067] S103. The 5G system NG-RAN triggers the EPSFB process.

[0068] Optionally, NG-RAN also triggers a measurement report solicitation and reporting process.

[0069] S104. The 5G system network entity PGW / SMF / UPF rejects the PDU session modification and indicates the ongoing IMS voice fallback.

[0070] S105: Redirect or switch to EPS.

[0071] S106a: Start the tracking area update (TAU) process.

[0072] S106b: Use a Packet Data Network (PDN) request to connect and request type switching.

[0073] S107: Initiate PDN connection modification to establish a dedicated bearer on the 4G network for voice services.

[0074] S108: Continue to establish the IMS voice session.

[0075] In the early stages of 5G technology rollout, operators adopted the EPS FB strategy to ensure normal call operations. This fallback strategy can mean falling back to 4G network equipment to establish voice services if 5G network equipment becomes unavailable.

[0076] Among them, the inability to establish voice services using 5G network equipment may include the following situations:

[0077] 1. The terminal device does not support VoNR;

[0078] If the terminal device does not support VoNR, EPS FB will be started directly.

[0079] 2. The terminal device measures and determines that the signal strength of the detection signal between the network device and the terminal device is less than a preset threshold.

[0080] When the terminal device supports VoNR, if the signal strength of the detection signal between the network device and the terminal device measured by the terminal device is less than a preset threshold, EPS FB is started.

[0081] The detection signal between network equipment and terminal devices can refer to the Reference Signal Receiving Power (RSRP) or the Signal to Interference plus Noise Ratio (SNR). RSRP can be a key parameter representing wireless signal strength and one of the physical layer measurement requirements. It can refer to the average signal power received on all resource elements (REs) (REs) carrying the reference signal within a symbol. SNR refers to the ratio of the strength of the received useful signal to the strength of the received interference signal (noise signal and interference signal).

[0082] FIG2 is used below to illustrate the specific process of how the voice service of a terminal device (such as a UE) falls back from VoNR to VoLTE.

[0083] As shown in FIG2 , the terminal device resides in the New Radio (NR) and is in an IDLE state.

[0084] S201. The 5G network device sends a paging message to the UE.

[0085] It is understood that the IDLE state may mean that the connection between the UE and the network device is disconnected, but the UE remains in the serving cell of the network device. The network device may send a paging message to the UE to wake up the UE to perform corresponding operations. For example, the UE establishes a voice service connection, or sends a text message or push notification to the UE.

[0086] Among them, 5G network equipment may refer to NR.

[0087] S202. The UE establishes Radio Resource Control (RRC) in response to the paging message.

[0088] S203. After the RRC is successfully established, the 5G network device configures the measurement event to the UE through the RRC reconfiguration message.

[0089] The detection event may include detection event A2 or detection event B2, which is not limited in the embodiment of the present application.

[0090] In one possible scenario, the 5G network device configures a measurement event A2 to the UE via an RRC reconfiguration message. Measurement event A2 may involve measuring whether the signal strength of the currently serving cell is below a preset threshold A2, and reporting event A2 to the network device when the signal strength of the currently serving cell is below the preset threshold A2. Based on the reported event A2, the network device initiates measurement of the corresponding cell's signal strength. Typically, after enabling measurement of the corresponding cell's signal strength, a cell handover operation may be performed.

[0091] In one possible scenario, the 5G network device may also configure the UE to report event B2 via an RRC reconfiguration message. Reporting event B2 may involve measuring the signal strength of the currently serving cell and a neighboring cell of a different system. If the signal strength of the currently serving cell is lower than a preset threshold B21, and the signal strength of the neighboring cell of a different system is higher than a preset threshold B22, event B2 is reported to the network device. The preset threshold B21 may be lower than the preset threshold B22. Based on the reported event B2, the network device determines whether the UE should switch from the currently serving cell to a neighboring cell of a different system.

[0092] At this time, if the UE establishes a voice service, it needs to transmit an invite message between the 5G network device.

[0093] If the UE initiates a voice service, that is, the UE is the calling device, the UE sends an invite message to the 5G network device; if the UE responds to the voice service initiated by the 5G network device, that is, the UE is the called device, the 5G network device sends an invite message to the UE.

[0094] The following is an example in which the UE is the called device and the 5G network device configures the measurement event A2 to the UE through the RRC reconfiguration message.

[0095] S204. The UE receives an invite message sent by the 5G network device.

[0096] The invite command is used to request to establish a voice service with the UE.

[0097] S205. In response to the invite message, the UE sends a 100trying message and a 183 message to the 5G network device.

[0098] The 100trying message indicates that the UE has received the invite message and is preparing to establish a call connection with the 5G network device. The 183 message is used to indicate the progress of establishing the call connection.

[0099] S206: The UE determines whether a condition for reporting a measurement event is met.

[0100] Since the 5G network equipment has configured the measurement event A2 to the UE through RRC configuration, it is necessary to measure whether the signal strength of the serving cell where the UE is currently located is lower than the preset threshold A2.

[0101] If the signal strength of the serving cell where the UE is currently located is lower than the preset threshold A2, and the conditions for the measurement event A2 are met, the UE sends an A2 measurement message to the 5G network device, that is, executes S207.

[0102] If the signal strength of the serving cell where the UE is currently residing is higher than or equal to the preset threshold A2, and the conditions for the measurement event A2 are not met, the UE does not send an A2 measurement message to the 5G network device and continues to establish voice services through the 5G network device, that is, executes S213.

[0103] S207. The UE reports the measurement event to the 5G network device.

[0104] Among them, the UE can report the measurement event A2 to the 5G network equipment.

[0105] S208. The 5G network device sends a blind redirection instruction to the UE in response to the detection event.

[0106] The blind redirect instruction may be used to instruct the UE to connect to the 4G network device for voice service. It is understood that the blind redirect instruction may include the frequency at which the UE connects to the 4G network device, such as frequency K.

[0107] S209. The UE attempts to access the serving cell corresponding to the 4G network device based on the blind redirection instruction.

[0108] It is understood that the UE can search for the serving cell corresponding to the 4G network device based on the frequency K indicated by the blind redirection instruction. If the UE finds serving cell 1 corresponding to the 4G network device, the UE can send msg1 to serving cell 1 to attempt to access serving cell 1. It should be noted that the process of the UE attempting to access the serving cell corresponding to the 4G network device based on the blind redirection instruction can be understood as executing EPS FB. EPS FB may include the method steps S105 to S107 shown in Figure 1.

[0109] S210: Determine whether the UE successfully accesses the 4G network device.

[0110] If serving cell 1 is normal, the serving cell will respond to msg1 sent by the UE, so that the UE can access the 4G network device and make a voice call through the serving cell corresponding to the 4G network device (ie, serving cell 1).

[0111] If there is a fault in service cell 1 or the environmental interference signal is too large, service cell 1 may not respond to the message msg1 or other subsequent messages sent by the UE, resulting in the failure of the UE to access service cell 1. In one possible case, if service cell 1 does not respond to the message msg1 sent by the UE within the duration of the first timer, the UE switches to the IDLE state. The above-mentioned first timer may refer to the T300 timer. It is understandable that before the second timer expires, the UE is in the IDLE state, so the UE will reselect the cell in the service cell corresponding to the 4G network device.

[0112] If the UE fails to successfully access the 4G network device, the UE continues to search for the 4G network device, that is, executing S212.

[0113] S211. The UE makes a voice call through the serving cell corresponding to the 4G network device.

[0114] S212. The UE re-determines serving cell 2 and accesses serving cell 2.

[0115] It is understandable that the UE can search for LTE cells based on the target frequency in the configuration information. After searching for the LTE cell (equivalent to service cell 2), the UE can try to access service cell 2 by sending msg1 to service cell 2. When sending msg1 to service cell 2, the UE usually also starts timer T300. If there is a fault in service cell 2 or the environmental interference of service cell 2 is large, service cell 2 will not respond to the msg1 sent by the UE, resulting in the timer T300 timing out and the UE entering the IDLE state. At this time, the UE stops timer T3430 and starts the T3411 timer. Since the UE is in the IDLE state, the UE will reselect the cell. If the T3411 timer times out, the TAU process is restarted and the LTE cell is re-accessed.

[0116] S213. The UE establishes a voice service through NR.

[0117] It is understood that the preset threshold used by the UE in determining whether the conditions for event A2 are met can be a threshold configured by the network equipment. In the early stages of 5G technology promotion, operators generally adopt a more conservative strategy and set the preset threshold higher. This may cause the terminal device to fall back to 4G when the 5G signal is good.

[0118] In view of this, an embodiment of the present application provides a call establishment method, which is applied to the process of establishing a voice service between a terminal device and a first network device. The method includes: when the signal strength of a first detection signal between the terminal device and the first network device is less than a first threshold value, if the signal strength of the first detection signal is greater than a second threshold value, suppressing the reporting of a measurement report of a preset measurement event to the first network device; if the signal strength of the first detection signal is less than or equal to the second threshold value, reporting a measurement report of the preset measurement event to the first network device; wherein the second threshold value is less than the first threshold value, and the first threshold value is a threshold value for triggering the terminal device to report a measurement report of the preset measurement event to the first network device. The preset measurement event is used by the first network device to instruct the terminal device to switch from the first network device to the second network device. It is understandable that in the early stage of using a new network standard, the operator usually adopts a more conservative fallback strategy, that is, setting a higher fallback threshold. In this case, when the signal strength of the first detection signal between the terminal device and the first network device is high and can meet the user's voice call needs, the terminal device will perform EPS FB under the instruction of the network device. This will cause the terminal device to fail due to EPS. The risk of voice service establishment failure caused by FB increases; the call establishment method provided in the embodiment of the present application further determines whether the signal strength of the first detection signal is greater than a second threshold value (a threshold value lower than the first threshold value) when the signal strength of the first detection signal between the terminal device and the first network device is less than the first threshold value, and suppresses reporting a measurement report of a preset measurement event to the first network device when the signal strength of the first detection signal is greater than the second threshold value. This can avoid the terminal device from executing EPS FB when the signal strength of the first detection signal between the terminal device and the first network device is high and can meet the user's voice call needs, thereby improving the continuity of the voice service. At the same time, only when the signal strength of the first detection signal is less than or equal to the second threshold value, the measurement report of the preset measurement event is reported to the first network device, so that the terminal device can execute EPS FB, so as to ensure the continuity of the voice service when the first detection signal between the terminal device and the first network device is low.

[0119] The following describes the network architecture and application scenarios of the embodiments of the present application in conjunction with the accompanying drawings.

[0120] Please refer to Figure 3, which is a schematic diagram of a network architecture exemplarily provided in an embodiment of the present application. As shown in Figure 3, the network architecture may include terminal equipment, LTE, NR, a core network, and IMS or the Internet. Among them, LTE: can be understood as the wireless access network of the 4G network. In the LTE network (commonly known as the 4G network), due to the evolution relationship, the access network part is called the Evolved UMTS Terrestrial Radio Access Network (Evolved UMTS Terrestrial Radio Access Network, E-UTRAN). In this application, the meaning of LTE is the same as that of E-UTRAN, both referring to the access network part of the 4G network. The terminal device can access LTE through a 4G base station. NR: can be understood as the wireless access network of the 5G network. In the 5G network, the access network part is called the Next Generation Radio Access Network (NG-RAN or NG RAN). In this application, the meaning of NR is the same as that of NG-RAN (or NG RAN), both referring to the access network part of the 5G network. It can be understood that LTE and NR are both access networks. The access network is responsible for connecting end users (end users) to the core network (also known as the backbone network) using wired or wireless connections and communication technologies, connecting them to the network. The access network is the edge of the network, the part closest to users and often referred to as the "last mile." The core network's primary functions are providing user connectivity, user management, and service delivery. As a bearer network, it provides an interface to external networks. Establishing user connections includes functions such as mobility management (MM), call management (CM), switching / routing, and voice notification (which integrates intelligent network services to connect to intelligent network peripheral devices). The core network of a 4G network is the Evolved Packet Core (EPC). The EPC network is the core network of a 4G mobile communication network. It falls within the core network category and possesses traditional mobile network capabilities such as user subscription data storage, mobility management, and data exchange, while also providing users with an ultra-high-speed Internet experience. The core network of a 5G network is the 5G Core (abbreviated as 5GC). 5GC will use general-purpose network function virtualization equipment to replace the dedicated communication equipment of 4G networks.

[0121] It should be noted that the core network in the network architecture shown in Figure 3 can be obtained by integrating EPC and 5GC. That is to say, the core network in the network architecture can include both network elements in EPC and network elements in 5GC. For example, the core network in the network architecture may include access and mobility management function (AMF) network element, mobility management entity (MME) network element, serving gateway (SGW) network element, packet data network gateway (PGW) network element, session management function (SMF) network element, user plane function (UPF) network element, unified data management function (UDM) network element and home subscriber server (HSS) network element, etc.

[0122] In some embodiments of the present application, the core network in the network architecture may include converged network elements obtained from network elements in the EPC and network elements in the 5GC. For example, SMF+PGW-C, UPF+PGW-U, UDM+HSS, etc. Among them, PGW-C is the control plane node of the PGW network element, and PGW-U is the user plane node of the PGW network element.

[0123] In some embodiments of the present application, the core network in the network architecture shown in FIG3 may include a Proxy Session Border Control (PSBC) network element, which is a combined network element that integrates a Session Border Control (SBC), a Proxy-Call Session Control Function (P-CSCF), an Access Transfer Control Function (ATCF), and an Access Transfer Gateway (ATGW). As an SBC network element, it connects the IMS core network / softswitch network with the external user access area, provides service access for IMS / softswitch users, enables interoperability of user services in different network environments, ensures IMS / softswitch network security, and supports QoS management, CAC traffic control, media management, CDR media call detail records, and other functions.

[0124] Each network element in the core network can also be called a functional entity, which can be a network element implemented on dedicated hardware, a software instance running on dedicated hardware, or an instance of a virtualized function on an appropriate platform.

[0125] It should be understood that the names of all network elements in this application are only examples. In future communications, such as 6G, they may also be called other names, or, in future communications, such as 6G, the network elements involved in this application may also be replaced by other entities or devices with the same functions, etc., and this application does not limit this. A unified explanation is given here and will not be repeated later. Optionally, the various network elements in the embodiments of the present application may be communication devices, or chips or chip systems that can be used in the communication devices, etc., and this embodiment of the present application does not limit this.

[0126] It is understood that the core network in the network architecture shown in Figure 3 may also include other devices, network elements, network entities, or network subsystems, such as a Policy Control Function (PCF) network element, and this application does not limit this. It should be noted that this application does not limit the distribution method of each network element in the core network. The specific distribution method can be referred to relevant technical documents, and this application does not elaborate on this.

[0127] IMS is a network architecture that provides voice and multimedia communication services (for example, voice, video, and text messaging) over Internet Protocol (IP) networks. IMS enables secure and reliable multimedia communication between different devices on different networks. The architectural model provides a unified infrastructure and common mechanisms for controlling, operating, routing, and managing sessions, as well as implementing authentication, authorization, and accounting controls. The IMS specifications include widely used recommendations from the Internet Engineering Task Force (IETF). For example, the Session Initialization Protocol (SIP) is used for session control signaling.

[0128] The Internet, also known as the international network, generally refers to a vast network of interconnected networks, linked by a common set of protocols to form a single, logically vast international network. From a network communications perspective, the Internet is a data communications network that connects computer networks in countries, regions, and institutions around the world using the Transmission Control Protocol (TCP) and Internet Protocol (IP).

[0129] It should be noted that the network architecture shown in FIG3 is not limited to including only the devices and networks shown in the figure, but may also include other devices not shown in the figure, and this application will not illustrate them one by one.

[0130] Please refer to Figure 4, which shows a voice call scenario provided by an embodiment of the present application. As shown in Figure 4, the terminal device 100 can transmit voice data with the terminal device 200 through the network device 1, the IMS, and the network device 2. Among them, the network device 1 is the network device corresponding to the cell where the terminal device 100 is currently located, and the network device 2 is the network device corresponding to the cell where the terminal device 200 is currently located. In some embodiments of the present application, the network device 1 and the network device 2 can be the same network device. In some embodiments of the present application, the terminal device 100 can be the party that initiates the voice call to request a voice call with the terminal device 200. In some other embodiments of the present application, the terminal device 200 can be the party that initiates the voice call to request a voice call with the terminal device 100.

[0131] The network device in the embodiment of the present application may be a device for communicating with a terminal device, for example, the network device may be a base station.

[0132] It should be understood that the above is an example of an application scenario and does not limit the application scenario of this application.

[0133] The call establishment method provided in the embodiment of the present application is described in detail below in conjunction with Figures 5, 6(a) and 6(b).

[0134] FIG5 is a flow chart of a call establishment method provided in an embodiment of the present application. As shown in FIG5 , the method includes:

[0135] S501. NR sends a paging message to UE.

[0136] It is understood that the IDLE state may mean that the connection between the UE and the base station is disconnected, but the UE remains in the base station's serving cell. The base station may send a paging message to the UE to wake up the UE to perform corresponding operations. For example, the UE establishes a voice service connection, or sends a text message or push notification to the UE.

[0137] It should be noted that the call establishment method provided in the embodiment of the present application is

[0138] S502: The UE establishes Radio Resource Control (RRC) in response to the paging message.

[0139] S503. After the RRC is successfully established, the 5G network device configures the measurement event to the UE through the RRC reconfiguration message.

[0140] The 5G network device can configure the UE to report event A2 or event B2. When the 5G network device can configure the UE to report event A2 or event B2, it may cause the UE to switch serving cells.

[0141] In one possible scenario, the 5G network device can configure the UE to report event A2 via an RRC reconfiguration message. Reporting event A2 may involve measuring whether the signal strength of the currently serving cell is below a preset threshold A2, and reporting event A2 to the network device when the signal strength of the currently serving cell is below the preset threshold A2. Based on the reported event A2, the network device initiates measurement of the corresponding cell's signal strength. Typically, after enabling measurement of the corresponding cell's signal strength, a cell handover operation may be performed.

[0142] At this time, if the UE establishes a voice service, it needs to transmit an invite message to the 5G network device. If the UE initiates the voice service, that is, the UE is the calling device, then the UE sends an invite message to the 5G network device; if the UE responds to the voice service initiated by the 5G network device, that is, the UE is the called device, then the 5G network device sends an invite message to the UE.

[0143] The following continues to use the UE as the called device, and the 5G network device configures the measurement event A2 to the UE through the RRC reconfiguration message as an example for explanation.

[0144] S504. The UE receives an invite message sent by the 5G network device.

[0145] The invite message is used to request to establish a voice service with the UE.

[0146] S505. In response to the invite message, the UE sends a 100trying message and a 183 message to the 5G network device.

[0147] The 100trying message indicates that the UE has received the invite message and is preparing to establish a call connection with the 5G network device. The 183 message is used to indicate the progress of establishing the call connection.

[0148] S506: The UE determines whether a first preset condition for reporting a measurement event is met.

[0149] Since the 5G network equipment has configured the measurement event A2 to the UE through RRC configuration, it is necessary to measure whether the signal strength of the serving cell where the UE is currently located is lower than the preset threshold A2.

[0150] If the signal strength of the serving cell where the UE currently resides is lower than the preset threshold A2, that is, the condition of the detection event A2 is met, it is determined whether the first preset condition for suppressing the detection event is met, that is, S507 is executed.

[0151] For example, the preset threshold A2 is -95dBm. The UE measures the RSRP between the 5G network device and the UE to be -96dBm. At this point, the first preset condition for event A2 has been met. It is necessary to further determine whether the second preset condition for suppressing the event A2 has been met. That is, S507 is executed.

[0152] If the signal strength of the serving cell where the UE is currently located is higher than or equal to the preset threshold A2, that is, the condition of the measurement event A2 is not met, the UE can directly establish a voice service through NR, that is, execute S511.

[0153] S507: The UE determines whether a second preset condition for suppressing the measurement event is met.

[0154] The second preset condition for suppressing the detection and reporting event may include:

[0155] The UE supports VoNR;

[0156] The signal strength of the detection signal of the serving cell where the UE is currently camped is greater than the preset threshold A2a;

[0157] The current moment is between receiving the invite message sent by NR and replying 180ringing to the network device.

[0158] Among them, whether the UE supports VoNR can usually be determined by the UE reading its own configuration file.

[0159] Typically, the UE determines whether the preset condition for suppressing the measurement event is met after sending the 100trying message and the 183 message to the 5G network device and before the UE sends the 180ringing message, so the preset condition is usually met. In this case, when the UE reads its own configuration file and determines that it supports VoNR, after sending the 100trying message and the 183 message to the 5G network device and before the UE sends the 180ringing message, it only needs to determine that the signal strength of the detection signal of the serving cell where the UE is currently camped is greater than the preset threshold A2a to determine that the preset condition for suppressing the measurement event is met.

[0160] The preset threshold A2a may be a threshold value that is smaller than the preset threshold A2. Meanwhile, when the signal strength of the detection signal of the serving cell where the UE currently resides is greater than the preset threshold A2a, normal voice services can be met.

[0161] For example, the preset threshold A2 is -95dBm, and the preset threshold A2a is -105dBm.

[0162] If the RSRP measured by the UE between the 5G network device and the UE is -94dBm, that is, the signal strength of the detection signal of the serving cell where the UE is currently residing is greater than the preset threshold A2, the reporting of the measurement event A2 will not be triggered. At this time, the UE does not report the measurement event A2 to the 5G network device, and establishes a voice service through the 5G network device, that is, executing S511.

[0163] If the UE measures the RSRP between the 5G network device and the UE to be -96dBm, the signal strength of the detection signal of the serving cell where the UE is currently residing is less than the preset threshold A2, which is the signal strength that triggers reporting of measurement event A2. However, since the RSRP between the 5G network device and the UE is greater than the preset threshold A2a, the preset condition for suppressing the measurement event is met. In this case, the UE does not report measurement event A2 to the 5G network device and establishes voice service through the 5G network device, that is, executes S511.

[0164] If the UE measures the RSRP between the 5G network device and the UE to be -106dBm, the signal strength of the detection signal of the serving cell where the UE is currently residing is less than the preset threshold A2, which is the signal strength that triggers reporting of measurement event A2. Furthermore, since the RSRP between the 5G network device and the UE is also less than the preset threshold A2a, the preset condition for suppressing the measurement event is not met. At this time, the UE reports measurement event A2 to the 5G network device, executing S508.

[0165] When the measured RSRP between the 5G network device and the UE is greater than the preset threshold A2, the UE does not report the measurement event A2 to the 5G network device, and establishes a voice service through the 5G network device; when the measured RSRP between the 5G network device and the UE is less than the preset threshold A2a, the UE reports the measurement event A2 to the 5G network device; when the measured RSRP between the 5G network device and the UE is less than the preset threshold A2 and greater than the preset threshold A2a, the UE suppresses reporting the measurement event A2 to the 5G network device; as shown in Figure 6(a).

[0166] If the current EPS FB strategy is continued to be used to establish voice services, when the RSRP between the 5G network device and the UE is measured to be greater than the preset threshold A2, the measurement event A2 will be directly reported to the 5G network device. This will result in the measurement event A2 being reported to the 5G network device whenever the RSRP between the 5G network device and the UE is less than or equal to the preset threshold A2, and EPS FB will be executed, as shown in Figure 6(b).

[0167] S508. The UE reports the measurement event A2 to the 5G network device.

[0168] S509. In response to the detection event A2, the 5G network device sends a blind redirection instruction to the UE.

[0169] S510 : The UE initiates a TAU process in response to the blind redirection instruction, and establishes a voice service through a 4G network device.

[0170] It can be understood that the UE responds to the blind redirection instruction, starts the TAU process, and the implementation process of establishing a voice service through the 4G network device can be similar to the steps shown in S208 to S212 above, which will not be repeated here.

[0171] It is understandable that there are multiple steps involved in implementing "responding to the blind redirection instruction, starting the TAU process, and establishing a voice service through the 4G network device" through the steps shown in the above S208 to S212, which is prone to failure and may lead to failure in establishing the voice call.

[0172] S511. UE establishes a voice service through a 5G network device.

[0173] It should be understood that, although the various steps in the flow chart in the above-described embodiment are shown in sequence according to the indication of the arrows, these steps are not necessarily performed in sequence according to the order indicated by the arrows. Unless clearly stated herein, the execution of these steps does not have strict order restrictions, and these steps can be performed in other orders. Moreover, at least a portion of the steps in the flow chart may include a plurality of sub-steps or a plurality of stages, and these sub-steps or stages are not necessarily performed at the same time, but can be performed at different times, and the execution order of these sub-steps or stages is not necessarily performed in sequence, but can be performed in turn or alternately with at least a portion of other steps or sub-steps or stages of other steps.

[0174] It is understandable that in order to implement the above functions, the electronic device includes hardware and / or software modules corresponding to the execution of each function. In combination with the algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application in combination with the embodiments, but such implementation should not be considered to be beyond the scope of this application.

[0175] The embodiment of the present application can divide the functional modules of the electronic device according to the above method example. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one module. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation. It should be noted that the names of the modules in the embodiment of the present application are schematic and are not limited to the names of the modules in actual implementation.

[0176] The call establishment method provided in the embodiment of the present application can be applied to electronic devices. Optionally, the electronic device includes a terminal device, which can also be called a terminal, user equipment (UE), mobile station (MS), mobile terminal (MT), etc. The terminal device can be a mobile phone, a smart TV, a wearable device, a tablet computer (Pad), a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, etc. The embodiments of the present application do not limit the specific technology and specific device form adopted by the terminal device.

[0177] A hardware structure of a terminal device is shown in FIG7 , and may include: a processor, an external memory interface, an internal memory, a Universal Serial Bus (USB) interface, a charging management module, a power management module, a battery, antenna 1, antenna 2, a mobile communication module, a wireless communication module, a sensor module, buttons, a motor, an indicator, a camera, a display, and a SIM card slot. The audio module may include a speaker, a receiver, a microphone, and a headphone jack, and the sensor module may include a pressure sensor, a gyroscope sensor, an air pressure sensor, a magnetic sensor, an acceleration sensor, a distance sensor, a proximity light sensor, a fingerprint sensor, a temperature sensor, a touch sensor, an ambient light sensor, and a bone conduction sensor.

[0178] It is understood that the structures illustrated in the embodiments of the present application do not constitute specific limitations on the terminal. In other embodiments, the terminal may include more or fewer components than shown, or may combine or separate certain components, or arrange the components differently. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0179] The processor may include one or more processing units, for example, the processor may include an application processor (AP), a modem processor (also known as a baseband processor), a graphics processor (GPU), an image signal processor (ISP), a controller, a video codec, a digital signal processor (DSP), and / or a neural-network processing unit (NPU). Different processing units may be independent devices or integrated into one or more processors. The processor is the nerve center and command center of the terminal. The controller may generate operation control signals based on instruction opcodes and timing signals to complete the control of instruction fetching and execution.

[0180] The wireless communication function of the terminal can be implemented through antenna 1, antenna 2, a mobile communication module, a wireless communication module, and a modem. In some embodiments, antenna 1 of the terminal is coupled to the mobile communication module, and antenna 2 is coupled to the wireless communication module, so that the terminal can communicate with network-side devices and other terminals through wireless communication technology.

[0181] In addition, operating systems run on the above components, such as the iOS operating system developed by Apple, the Android open source operating system developed by Google, and the Windows operating system developed by Microsoft.

[0182] The terminal's operating system can adopt a layered architecture, event-driven architecture, microkernel architecture, microservice architecture, or cloud architecture. The embodiments of this application take the Android system with a layered architecture as an example to illustrate the hardware and software structure of the terminal. It should be noted that although the embodiments of this application are described using the Android system as an example, its basic principles are also applicable to terminals based on operating systems such as iOS or Windows.

[0183] Figure 8 is a block diagram of the terminal's software architecture. The software structure employs a layered architecture, which divides the software into several layers, each with distinct roles and divisions of labor. Layers communicate with each other via software interfaces. Taking the Android system running on an AP as an example, in some embodiments, the Android system is divided into five layers: from top to bottom, the application layer, the application framework layer (Framework), the Android runtime (Android runtime) and system libraries, the hardware abstraction layer (HAL), and the system kernel layer (Kernel).

[0184] The application layer can include a series of application packages. These packages may include apps such as camera, gallery, calendar, call, map, WLAN, Bluetooth, music, video, and short messaging. The application layer may also include the system UI, which is used to display the terminal interface, such as the signal icon corresponding to the SIM card and the call interface. The application framework layer provides the application programming interface (API) and programming framework for applications in the application layer. The application framework layer includes some predefined functions. For example, the application framework layer may include a window manager, content provider, view system, phone manager, resource manager, notification manager, etc. The phone manager is used to provide terminal call functions, such as call status management (including connecting and ending calls). The phone manager is represented by the telephony in Figure 8. The application framework layer may also include the radio interface layer (RIL). The modem processor (modem) can exchange information with the telephony through the RIL.

[0185] The modem can include the NAS (Non-Access Stratum) layer, the RRC (Radio Resource Control) layer, the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer, the Medium Access Control (MAC) layer, and the Physical (PHY) layer. Each of these layers can be a software module. The modem interacts with the base station through an antenna.

[0186] In addition, some embodiments of the present application provide a terminal device, which includes: one or more processors and a memory; the memory is used to store computer program code, and the computer program code includes computer instructions. When the one or more processors execute the computer instructions, the terminal executes the above-mentioned paging message processing method.

[0187] Some embodiments of the present application provide a chip system for use in a terminal device. The chip system includes at least one processor and an interface, wherein the interface is configured to receive instructions and transmit them to the at least one processor; the at least one processor executes the instructions, causing the terminal to execute the aforementioned paging message processing method. The chip system may be a modem, or a system on a chip (SoC) including a modem, and the aforementioned method may be implemented by a modem.

[0188] In this application, "at least one" means one or more, and "plurality" means two or more. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or plural.

[0189] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0190] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0191] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0192] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative; for example, the division of the units is merely a logical function division, and there may be other division methods in actual implementation; for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection of some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0193] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0194] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0195] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A call establishment method, characterized in that: The method is applied to a process of establishing a voice service between a terminal device and a first network device, and the method includes: When the signal strength of the first detection signal between the terminal device and the first network device is less than the first threshold: If the signal strength of the first detection signal is greater than a second threshold value, suppressing reporting of a measurement report of a preset measurement event to the first network device; If the signal strength of the first detection signal is less than or equal to the second threshold, reporting a measurement report of the preset measurement event to the first network device; The second threshold value is smaller than the first threshold value, and the first threshold value is a threshold value for triggering the terminal device to report the preset measurement event to the first network device, and the preset measurement event is used by the first network device to instruct the terminal device to switch from the first network device to the second network device.

2. The method according to claim 1, characterized in that If the signal strength of the first detection signal is greater than the second threshold value, suppressing reporting of the preset detection event to the first network device includes: If the signal strength of the first detection signal is greater than the second threshold value, determining whether the terminal device supports establishing a voice service using the first network device; If the terminal device supports establishing a voice service through the first network device, suppressing reporting of the preset measurement event to the first network device.

3. The method according to claim 2, characterized in that If the terminal device supports establishing a voice service through the first network device, suppressing reporting of the preset measurement event to the first network device includes: When the terminal device supports establishing a voice service through the first network device, and the terminal device has currently received an invite message and has not yet sent a 180 ringing message, suppressing reporting of the preset measurement event to the first network device.

4. The method according to any one of claims 1 to 3, characterized in that The signal strength of the first detection signal includes reference signal received power RSRP.

5. The method according to any one of claims 1 to 4, characterized in that If the signal strength of the first detection signal is greater than the second threshold value, suppressing reporting of the preset detection event to the first network device includes: If the signal strength of the first detection signal is greater than the second threshold value, suppress reporting the preset detection event to the first network device, and establish a voice service through the first network device.

6. The method according to any one of claims 1 to 5, characterized in that The first network device is a new radio interface NR device, and the second network device is a long term evolution LTE device.

7. The method according to any one of claims 1 to 6, characterized in that The preset measurement and reporting event is the A2 measurement and reporting event.

8. The method according to any one of claims 1 to 7, characterized in that If the signal strength of the first detection signal is less than or equal to the second threshold value, reporting the preset detection event to the first network device includes: If the signal strength of the first detection signal is less than or equal to the second threshold, the preset detection event is reported to the first network device, so that the first network device starts an evolved packet system fallback EPS FB process based on the preset detection event.

9. An electronic device, characterized in that: include: one or more processors; Memory; and one or more computer programs, wherein the one or more computer programs are stored on the memory, and when the computer programs are executed by the one or more processors, the electronic device performs the method according to any one of claims 1 to 8.

10. A chip system, characterized in that: The chip system includes a processor for calling and running a computer program from a memory, so that an electronic device equipped with the chip system executes the method according to any one of claims 1 to 8.

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