Voice communication method, device and chip

Abstract

The embodiment of the invention provides a voice call method, a voice call device and a chip, which can reduce the call drop rate of terminal equipment, thereby improving the user experience. The method comprises the following steps: a current serving cell of the terminal equipment is a first cell, adjacent cells of the first cell comprise a second cell and a third cell, the third cell does not support a voice call service, and when the terminal equipment resides in the first cell and is in a voice call state, and the terminal equipment needs to perform cell selection or cell reselection, the terminal equipment does not support the voice call service. Sending a first message to a second cell, wherein the first message is used for requesting to access the second cell; and when the terminal device resides in the first cell and is not in the voice call state, and the terminal device needs to perform cell selection or cell reselection, a second message is sent to a third cell, and the second message is used for requesting to access the third cell.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a voice call method, device and chip. Background Art

[0002] When the terminal device triggers a radio link failure (RLF) or enters an idle state, the terminal device will perform cell selection or cell reselection. If the terminal device performs cell selection or cell reselection during a voice call, in some cases, the terminal device will experience call abnormalities, such as dropped calls (i.e., call interruption).

[0003] Therefore, there is an urgent need to provide a method to reduce the call drop rate of terminal equipment. Summary of the invention

[0004] The embodiments of the present application provide a voice call method, device and chip, which can reduce the call drop rate of terminal equipment, thereby improving the user experience.

[0005] After research, it was found that when the terminal device triggers a radio link failure (RLF) or enters an idle (IDLE) state, the terminal device will perform cell selection or cell reselection. If the terminal device performs cell selection or cell reselection during a voice call, and the frequency band corresponding to the cell selected by the terminal device does not support voice call services, the terminal device will experience call drops. For example, some countries (such as Malaysia) or regions promote 5G non-standalone architecture (NSA) to enable users to access the Internet through 5G; in the 5G NSA mode, when the terminal device is connected to the anchor cell, it can simultaneously connect to the new radio (NR) cell, so that when the terminal device accesses the anchor cell, the 5G network can be used through the NR cell; however, when the terminal device accesses the anchor cell, call abnormalities such as call drops will occur. Research has found that this is because the frequency band corresponding to the anchor cell does not have the voice over long-term evolution (VoLTE) capability, which causes the terminal device to access the anchor cell and experience call drops, which makes the user experience poor.

[0006] In a first aspect, a voice call method is provided, in which a current serving cell of a terminal device is a first cell, neighboring cells of the first cell include a second cell and a third cell, the third cell does not support voice call service, and the first cell and the second cell support voice call service, the method comprising: when the terminal device resides in the first cell and is in a voice call state, and the terminal device needs to perform cell selection or cell reselection, sending a first message to the second cell, the first message being used to request access to the second cell; wherein, when the terminal device sends the first message to the second cell, the priority of the first cell is lower than the priority of the second cell, and the signal strength of the first cell is lower than the signal strength of the second cell. degree, the priority of the third cell is greater than the priority of the second cell, and the signal strength of the third cell is greater than the signal strength of the second cell; when the terminal device resides in the first cell and is not in a voice call state, and the terminal device needs to perform cell selection or cell reselection, a second message is sent to the third cell, and the second message is used to request access to the third cell; wherein, when the terminal device sends the second message to the third cell, the priority of the first cell is lower than the priority of the second cell, the signal strength of the first cell is lower than the signal strength of the second cell, the priority of the third cell is greater than the priority of the second cell, and the signal strength of the third cell is greater than the signal strength of the second cell.

[0007] The voice call method provided in the embodiment of the present application, when the service cell of the terminal device is the first cell, and the neighboring cells of the first cell include the second cell and the third cell that does not support the voice call service, if the priority of the first cell is lower than that of the second cell, the priority of the third cell is greater than that of the second cell, the signal strength of the first cell is lower than that of the second cell, and the signal strength of the third cell is greater than the signal strength of the second cell, then when the terminal device performs cell reselection or cell selection when it is not in a voice call state, the third cell is given priority; however, when the terminal device performs cell reselection or cell selection when it is in a voice call state, the second cell is given priority, that is, when the terminal device is in a voice call state, when the terminal device performs cell reselection or cell selection, it will give priority to cells other than the cells that do not support the voice call service, thereby reducing the probability of the terminal device residing in the cell that does not support the voice call service during the voice call. In this way, the call drop rate of the terminal device can be reduced, thereby improving the user experience.

[0008] It should be understood that the serving cell can be understood as the cell where the terminal device is currently residing or accessed. For example, if the cell currently accessed by the terminal device is the first cell, then the current serving cell is the first cell. Signal strength can refer to RSRP or RSRQ, etc. The priority of the first cell is less than the priority of the second cell and the priority of the third cell is greater than the priority of the second cell, which can mean that when the terminal device performs cell selection or cell reselection, the priority of the third cell is higher than the priority of the second cell, and the priority of the second cell is higher than the priority of the first cell.

[0009] In combination with the first aspect, in certain implementation methods of the first aspect, the sending of the first message to the second cell includes: sending the first message to the second cell based on a first preset rule, the first preset rule including at least one of the following: not selecting the cell corresponding to the first preset frequency band or the first preset frequency point, or, performing cell selection or cell reselection based on the updated priority of the cell corresponding to the first preset frequency band or the first preset frequency point, or, not giving priority to the anchor cell, the updated priority of the cell corresponding to the first preset frequency band is lower than the original priority of the cell corresponding to the first preset frequency band, and the updated priority of the cell corresponding to the first preset frequency point is lower than the original priority of the cell corresponding to the first preset frequency point; wherein the first preset frequency band includes the frequency band corresponding to the third cell, or the first preset frequency point includes the frequency point corresponding to the third cell.

[0010] It should be understood that the number of anchor cells can be one or more. And the anchor cells may include cells with voice call capabilities and / or cells without voice call capabilities. The original priority can be understood as the priority before the update. The updated priority of the cell corresponding to the first preset frequency band is lower than the original priority of the cell corresponding to the first preset frequency band, which may mean that the priority of the cell corresponding to the first preset frequency band after the update is lower than that before the update. The updated priority of the cell corresponding to the first preset frequency point is lower than the original priority of the cell corresponding to the first preset frequency point, which may mean that the priority of the cell corresponding to the first preset frequency point after the update is lower than that before the update.

[0011] In combination with the first aspect, in certain implementations of the first aspect, sending the second message to the third cell includes: sending the second message to the third cell based on a second preset rule, the second preset rule is different from the first preset rule, and the second preset rule includes: giving priority to selecting an anchor cell.

[0012] It should be understood that the second preset rule is a rule for the terminal device to select or reselect a cell when the terminal device is not in a voice call state. By enabling the terminal device to give priority to the anchor cell, the probability that the terminal device stays in the anchor cell is greater, thereby enabling the terminal device to give priority to the use of the 5G network, thereby improving the user experience.

[0013] In combination with the first aspect, in certain implementations of the first aspect, before the terminal device accesses the first cell, the terminal device resides in the third cell; the method also includes: during the process of the terminal device establishing a voice call in the third cell, receiving a third message from the third cell, the third message being used to instruct the terminal device to perform a preset event measurement, the third message carrying information for indicating a target frequency and information for indicating at least one threshold, the preset event being an A5 event, the at least one threshold including a first threshold and a second threshold, the first threshold being greater than the second threshold, the cell corresponding to the target frequency being a neighboring cell of the third cell, the first threshold being a threshold value of the signal strength of the third cell, and the second threshold being a threshold value of the signal strength of a neighboring cell of the third cell; in the at least one When the threshold satisfies the preset conditions, the first preset frequency band or the first preset frequency point is determined at least according to the frequency band corresponding to the target frequency point and the frequency band corresponding to the third cell, wherein the preset conditions include a first preset condition, the first preset condition is that the first threshold is greater than or equal to the first preset threshold, and the second threshold is less than or equal to the second preset threshold, and the first preset threshold is greater than the second preset threshold; in response to the third message, a measurement report is sent to the third cell, the measurement report includes the signal strength information of the third cell and the signal strength information of at least one cell corresponding to the target frequency point, and the at least one cell includes the first cell; a fourth message is received from the third cell, the fourth message is used to instruct the terminal device to switch to the first cell; in response to the fourth message, the first cell is accessed.

[0014] It should be understood that when the first threshold is greater than or equal to the first preset threshold, it means that the first threshold is high, and the signal strength of the serving cell is usually less than or equal to the first threshold; when the second threshold is less than or equal to the second preset threshold, it means that the second threshold is low, and the signal strength of the neighboring cell of the third cell is usually greater than or equal to the second threshold. Therefore, based on the first threshold and the second threshold, after the terminal device performs cell measurement, the probability of switching to the neighboring cell of the third cell is relatively high. Based on this, the terminal device can determine that the first threshold and the second threshold are not set reasonably, and the current switching event may be an unreasonable switching event. Furthermore, the terminal device can determine that the frequency or frequency band corresponding to the current serving cell may not support voice call services.

[0015] Through the above-mentioned technical solution, the terminal device can determine the frequency or frequency band that does not have the capability of voice calls. Compared with the preset frequency band or frequency point that does not have the capability of voice calls, the terminal device can identify the frequency or frequency band that does not have the capability of voice calls other than the preset frequency band or frequency point. In this way, when the terminal device selects a cell according to the first preset rule, the probability of the terminal device selecting the cell corresponding to the frequency or frequency band that does not have the capability of voice calls is relatively small, which can further reduce the call drop rate of the terminal device and improve the user experience.

[0016] In combination with the first aspect, in a possible implementation, the preset condition further includes a second preset condition, and the second preset condition is that the terminal device receives a message from a current serving cell for instructing cell switching.

[0017] It should be understood that since the unreasonable settings of the first threshold and the second threshold may be caused by abnormalities in the access network equipment, the first preset condition and the second preset condition are used in coordination. When the first threshold and the second threshold are set unreasonably and the terminal device receives a message from the current service cell to indicate a cell switch, it can be more accurately determined that the current service cell of the terminal device does not support voice call services, thereby making the first preset frequency point or the first preset frequency band determined by the terminal device more accurate.

[0018] In combination with the first aspect, in certain implementations of the first aspect, the first preset frequency band or the first preset frequency point is determined at least based on the frequency band corresponding to the target frequency point and the frequency band corresponding to the third cell, including: when the frequency band corresponding to the target frequency point is different from the frequency band corresponding to the third cell, the first preset frequency band includes the frequency band corresponding to the third cell.

[0019] It should be understood that the target frequency is a frequency with voice call capability indicated by the third cell to the terminal device. Therefore, when the frequency band corresponding to the target frequency is different from the frequency band corresponding to the third cell, it means that the terminal device needs to switch to a cell corresponding to a frequency band other than the frequency band corresponding to the third cell, indicating that the frequency band corresponding to the third cell may not have voice call capability, and therefore, the first preset frequency band includes the frequency band corresponding to the third cell.

[0020] In combination with the first aspect, in certain implementations of the first aspect, the terminal device determines a first preset frequency band or a first preset frequency point based at least on the frequency band corresponding to the target frequency point and the frequency band corresponding to the third cell, including: when the frequency band corresponding to the target frequency point is the same as the frequency band corresponding to the third cell, and the target frequency point is different from the frequency point corresponding to the third cell, the first preset frequency point includes the frequency point corresponding to the third cell.

[0021] It should be understood that the frequency band corresponding to the target frequency is the same as the frequency band corresponding to the third cell, indicating that the frequency band corresponding to the third cell has voice call capabilities. Therefore, the terminal device does not need to switch frequency bands; the target frequency is different from the frequency corresponding to the third cell, indicating that the terminal device needs to switch to a cell corresponding to a frequency other than the frequency corresponding to the third cell, indicating that the frequency corresponding to the third cell may not have voice call capabilities. Therefore, the first preset frequency includes the frequency corresponding to the third cell.

[0022] In combination with the first aspect, in certain implementations of the first aspect, the situation where the terminal device needs to perform cell selection or cell reselection includes: the terminal device is in an idle IDLE state, or the terminal device triggers a radio link failure RLF process.

[0023] In combination with the first aspect, in some implementations of the first aspect, the third cell is an anchor cell in a non-standalone network NSA. In a specific scenario, the third cell is an anchor cell in NSA, and the first cell and the second cell are non-anchor cells in NSA.

[0024] In combination with the first aspect, in some implementations of the first aspect, the first preset frequency band includes frequency band B28 under the Long Term Evolution LTE communication technology.

[0025] In combination with the first aspect, in certain implementations of the first aspect, the method also includes at least one of the following: the first cell, the second cell and the third cell are LTE cells; or, the unsupported voice call service is unsupported Internet Protocol IP Multimedia Subsystem IMS voice call service.

[0026] In a second aspect, a voice call device is provided, which is used to execute the method in any possible implementation of the first aspect. Specifically, the device includes a module for executing the method in any possible implementation of the first aspect.

[0027] In a third aspect, an embodiment of the present application provides another voice call device, including a processor, the processor is coupled to a memory, and can be used to execute instructions in the memory to implement the method in any possible implementation of the first aspect. Optionally, the device also includes a memory. Optionally, the device also includes a communication interface, and the processor is coupled to the communication interface.

[0028] In one implementation, the apparatus is a terminal device. When the apparatus is a terminal device, the communication interface may be a transceiver, or an input / output interface.

[0029] In another implementation, the device is a chip configured in a terminal device. When the device is a chip configured in a terminal device, the communication interface may be an input / output interface.

[0030] In a fourth aspect, a processor is provided, comprising: an input circuit, an output circuit, and a processing circuit. The processing circuit is used to receive a signal through the input circuit and transmit a signal through the output circuit, so that the processor executes the method in any possible implementation of the first aspect.

[0031] In the specific implementation process, the processor may be a chip, the input circuit may be an input pin, the output circuit may be an output pin, and the processing circuit may be a transistor, a gate circuit, a trigger, and various logic circuits. The input signal received by the input circuit may be received and input by, for example, but not limited to, a receiver, and the signal output by the output circuit may be, for example, but not limited to, output to a transmitter and transmitted by the transmitter, and the input circuit and the output circuit may be the same circuit, which is used as an input circuit and an output circuit at different times. The embodiments of the present application do not limit the specific implementation methods of the processor and various circuits.

[0032] In a fifth aspect, a processing device is provided, comprising a processor and a memory. The processor is used to read instructions stored in the memory, and can receive signals through a receiver and transmit signals through a transmitter to execute the method in any possible implementation of the first aspect.

[0033] Optionally, the number of the processors is one or more, and the number of the memories is one or more.

[0034] Optionally, the memory may be integrated with the processor, or the memory may be provided separately from the processor.

[0035] In the specific implementation process, the memory can be a non-transitory memory, such as a read-only memory (ROM), which can be integrated with the processor on the same chip or can be set on different chips respectively. This application does not limit the type of memory and the setting method of the memory and the processor.

[0036] It should be understood that the relevant data interaction process, such as sending indication information, can be a process of outputting indication information from a processor, and receiving capability information can be a process of receiving input capability information from a processor. Specifically, the processed output data can be output to a transmitter, and the input data received by the processor can come from a receiver. Among them, the transmitter and the receiver can be collectively referred to as a transceiver.

[0037] The processing device in the fifth aspect mentioned above can be a chip. The processor can be implemented by hardware or by software. When implemented by hardware, the processor can be a logic circuit, an integrated circuit, etc.; when implemented by software, the processor can be a general-purpose processor, which is implemented by reading the software code stored in the memory. The memory can be integrated in the processor or can be located outside the processor and exist independently.

[0038] In a sixth aspect, a computer program product is provided, the computer program product comprising: a computer program (also referred to as code, or instruction), which, when executed, enables a computer to execute a method in any possible implementation of the first aspect.

[0039] In a seventh aspect, a computer-readable storage medium is provided, which stores a computer program (also referred to as code, or instructions) which, when executed on a computer, enables the computer to execute a method in any possible implementation of the first aspect.

[0040] The chip involved in this application may be a chip system. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A schematic diagram of a communication system used in an embodiment of the present application;

[0042] Figure 2 A schematic diagram of a voice call scenario provided in an embodiment of the present application;

[0043] Figure 3 A flowchart of a voice call method is shown;

[0044] Figure 4 A flowchart of a voice call method provided in an embodiment of the present application;

[0045] Figure 5 A flowchart of another voice call method provided in an embodiment of the present application;

[0046] Figure 6 A schematic block diagram of a voice communication device provided in an embodiment of the present application;

[0047] Figure 7 A schematic block diagram of another voice communication device provided in an embodiment of the present application;

[0048] Figure 8 It is a hardware structure block diagram of a terminal device;

[0049] Fig. 9 A schematic diagram of a system including a terminal device and a base station. Detailed implementation manners

[0050] The technical solutions in the present application will be described below with reference to the accompanying drawings.

[0051] In some embodiments provided by the present application, terms such as "first" and "second" are used to distinguish identical or similar items with basically the same functions and effects. For example, the first numerical value and the second numerical value are only used to distinguish different numerical values, and do not limit their order. Those skilled in the art can understand that terms such as "first" and "second" do not limit the quantity and execution order, and terms such as "first" and "second" do not necessarily limit them to be different.

[0052] It should be noted that in the embodiments of the present application, words such as "exemplarily" or "for example" are used to represent examples, illustrations or explanations. Any embodiment or design solution described as "exemplarily" or "for example" in the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplarily" or "for example" is intended to present related concepts in a specific manner.

[0053] In the embodiments of the present application, "at least one" means one or more, and "a plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone, where A and B can be singular or plural. The character " / " generally represents that the associated objects before and after are in an "or" relationship. "At least one (item)" or its similar expression refers to any combination of these items, including any combination of single item (item) or plural items (items). For example, at least one (item) of a, b, or c can represent: a, b, c, a - b, a - c, b - c, or a - b - c, where a, b, and c can be single or multiple.

[0054] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) communication system, fifth generation (5G) system or new radio (NR), future evolved communication systems, such as sixth generation (6G) system, etc.

[0055] The terminal device in the embodiments of the present application may also be referred to as: user equipment (UE), mobile station (MS), mobile terminal (MT), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication equipment, user agent or user device, etc.

[0056] The access network equipment and core network equipment in the embodiments of the present application may be collectively referred to as network equipment.

[0057] The core network device of the embodiment of the present application may be a core network device in a 4G system, such as a mobile management entity (MME), a serving gateway (SGW), etc., or a core network device in a 5G system, such as an access and mobility management function (AMF) network element, a user plane function (UPF) network element, etc. It may also be a core network device with other names, which is not limited in the embodiment of the present application.

[0058] The access network device can be any device with wireless transceiver function. Access network equipment includes, but is not limited to, evolved Node B (eNB), radio network controller (RNC), Node B (NB), base station controller (BSC), base transceiver station (BTS), home base station (e.g., home evolved NodeB, or home Node B, HNB), baseband unit (BBU), access point (AP) in wireless fidelity (WiFi) system, wireless relay node, wireless backhaul node, transmission point (TP) or transmission and reception point (TRP), etc. It can also be a 5G base station (next-Generation Node B, gNB) in a 5G, such as NR, system, or a transmission point (TRP or TP), one or a group of (including multiple antenna panels) antenna panels of a base station in a 5G system, or it can also be a network node constituting a gNB or a transmission point, such as a baseband unit (BBU) or a distributed unit (DU), etc.

[0059] In some deployments, the gNB may include a centralized unit (CU) and a DU. The gNB may also include an active antenna unit (AAU). The CU implements some functions of the gNB, and the DU implements some functions of the gNB. For example, the CU may be responsible for processing non-real-time protocols and services, such as the functions of the radio resource control (RRC) layer, the service data adaptation protocol (SDAP) layer, and / or the packet data convergence protocol (PDCP) layer. The DU may be responsible for processing physical layer protocols and real-time services. For example, the functions of the radio link control (RLC) layer, the media access control (MAC) layer, and the physical (PHY) layer may be implemented. A DU may be connected to only one CU or to multiple CUs, and a CU may be connected to multiple DUs, and the CU and DU may communicate through the F1 interface. The AAU may implement some physical layer processing functions, RF processing, and related functions of active antennas. Since the information of the RRC layer will eventually be delivered to the PHY layer and become the information of the PHY layer, or be converted from the information of the PHY layer, therefore, under this architecture, high-level signaling, such as RRC layer signaling, can also be considered to be sent by DU, or by DU+AAU.

[0060] It is understandable that the access network device may be a device including one or more of a CU node, a DU node, and an AAU node. In addition, the CU may be classified as an access network device in an access network (radio access network, RAN), or the CU may be classified as an access network device in a core network (core network, CN), and this application does not limit this.

[0061] The access network equipment provides services for the cell. The terminal equipment communicates with the cell through the transmission resources (for example, frequency domain resources, or spectrum resources) allocated by the access network equipment. The cell can belong to a macro base station (for example, macro eNB or macro gNB, etc.), or it can belong to a base station corresponding to a small cell. The small cell here may include: metro cell, micro cell, pico cell, femto cell, etc. These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-speed data transmission services.

[0062] To facilitate understanding of the embodiments of the present application, first Figure 1 A communication system applicable to an embodiment of the present application is described in detail.

[0063] Figure 1 A schematic diagram of a communication system 100 to which an embodiment of the present application is applied is shown. The communication system 100 includes an access network, a core network, and an Internet protocol (IP) multimedia subsystem (IMS) or the Internet.

[0064] Among them, the access network includes at least one terminal device, such as Figure 1 The terminal device 110 shown in the figure also includes at least one access network device, such as Figure 1 The access network device 120 and the access network device 130 are shown. The core network device can be connected to the access network device in a wireless or wired manner, and the terminal device can be connected to the access network device in a wireless manner within the coverage of the access network device.

[0065] like Figure 1 As shown, the access network device 120 may include cell A and cell B, and the access network device 130 may provide services for cell C. The terminal device 110 is located within the range of cell A, and the current serving cell of the terminal device is cell A, and information can be exchanged with cell A. Cell B and cell C are neighboring cells of cell A.

[0066] Optionally, as the terminal device 110 moves, the signal strength of cell A becomes weaker, and the terminal device 110 can perform cell switching. In one example, assuming that the terminal device 110 moves within the range of cell B, and the signal strength of cell B is greater than the signal strength of cell A, the terminal device 110 can access cell B and exchange information with cell B; in another example, assuming that the terminal device 110 moves within the range of cell C, and the signal strength of cell C is greater than the signal strength of cell A, the terminal device 110 can access cell C and exchange information with cell C.

[0067] It should be understood that information interaction between the terminal device 110 and cell A or cell B may refer to information interaction between the terminal device 110 and the access network device 120 that provides services for cell A or cell B, and information interaction between the terminal device 110 and cell C may refer to information interaction between the terminal device 110 and the access network device 130 that provides services for cell C.

[0068] The access network device 120 and the access network device 130 can communicate with the terminal device 110 via a wireless link. The terminal device 110, the access network device 120 or the access network device 130 can be configured with multiple antennas, and the multiple antennas may include at least one transmitting antenna for sending signals and at least one receiving antenna for receiving signals. In addition, the terminal device 110, the access network device 120 or the access network device 130 also additionally includes a transmitter chain and a receiver chain. It can be understood by those of ordinary skill in the art that they can all include multiple components related to signal transmission and reception (such as processors, modulators, multiplexers, demodulators, demultiplexers or antennas, etc.). Therefore, the access network device 120 and the access network device 130 can communicate with the terminal device 110 via multi-antenna technology.

[0069] The main functions of the core network are to provide user connections, user management, and service bearing, and to provide an interface to the external network as a bearer network. The establishment of user connections includes functions such as mobility management (MM), call management (CM), switching / routing, and recording notification (combined with intelligent network services to complete the connection relationship with intelligent network peripheral devices).

[0070] It can be understood that the core network of the 4G network is the evolved packet core (EPC) network. The EPC network is the core network of the 4G mobile communication network. It belongs to the core network category and has traditional mobile network capabilities such as user contract data storage, mobility management, and data exchange, and can provide users with ultra-high-speed Internet experience. The core network of the 5G network is the 5G Core (abbreviated as 5GC). 5GC will use general network function virtualization equipment to replace the dedicated communication equipment of the 4G network.

[0071] It should be noted that Figure 1The core network in the network architecture shown 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 elements, mobility management entity (MME) network elements, serving gate way (SGW) network elements, packet data network gate way (PGW) network elements, session management function (SMF) network elements, user plane function (UPF) network elements, unified data management function (UDM) network elements and home subscriber server (HSS) network elements, etc.

[0072] In some embodiments of the present application, the core network in the network architecture may include a converged network element obtained by the network element in the EPC and the network element 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.

[0073] In some embodiments of the present application, Figure 1 The core network in the network architecture shown may include a proxy session border control (PSBC) network element, which is a combined network element that integrates session border control (SBC), proxy call session control function (P-CSCF), access transfer control function (ATCF), and access transfer gateway (ATGW). As an SBC network element, it connects the IMS core network / soft switch network with the external user access area, completes the service access of IMS / soft switch users, realizes the interoperability of user services under different network environments, ensures the security of IMS / soft switch networks, and supports QoS management, CAC traffic control, media management, CDR media call details, and other functions.

[0074] 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.

[0075] It should be understood that the names of all network elements in this application are only examples. In future communications, such as 6G, they can also be called other names, or in future communications, such as 6G, the network elements involved in this application can also be replaced by other entities or devices with the same functions, etc., and this application does not limit this. A unified explanation is made here, and no further description will be given later. Optionally, the various network elements in the embodiments of the present application can 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.

[0076] Understandable, Figure 1 The core network in the network architecture shown may also include other devices, network elements, network entities or network subsystems, such as a policy control function (PCF) network element, which is not limited in this application. It should be noted that this application does not limit the distribution of each network element in the core network. The specific distribution method can be referred to in relevant technical documents, which is not described in detail in this application.

[0077] IMS is a network architecture that provides voice and multimedia communication services (e.g., voice, video, and text messaging) based on the Internet protocol (IP) network. IMS enables secure and reliable multimedia communications between different devices in different networks. The architecture 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.

[0078] Internet generally refers to the Internet, also known as the international network, which refers to a huge network of networks connected in series. These networks are connected by a set of common protocols to form a logical single huge international network. From the perspective of network communication, the Internet is a data communication network that connects computer networks in various countries, regions, and institutions around the world using the transmission control protocol (TCP) / internet protocol (IP).

[0079] It should be understood that Figure 1 This is just a schematic diagram. The communication system 100 may also include other network devices, such as wireless relay devices and wireless backhaul devices. Figure 1 The embodiment of the present application does not limit the number of core network devices, access network devices and terminal devices included in the communication system 100.

[0080] Optionally, the communication system 100 may further include other network entities such as a network controller and a mobility management entity, but the embodiments of the present application are not limited thereto.

[0081] It should be understood that Figure 1 The communication system 100 shown is only an example, and the present application does not limit the specific architecture of the applicable system, nor the number and form of various devices included in each communication system. For example, the number of neighboring cells of the serving cell currently accessed by the terminal device can be greater, and the neighboring cells of the serving cell and the serving cell can belong to the cells covered by the same access network device, or can also belong to cells covered by different access network devices.

[0082] See also Figure 2 , Figure 2 A schematic diagram of a voice call scenario provided in an embodiment of the present application. Figure 2 As shown, the terminal device 210 can transmit voice data with the terminal device 240 through the access network device 220, the IMS and the access network device 230. Among them, the access network device 220 is the device corresponding to the cell where the terminal device 100 currently resides, and the access network device 230 is the device corresponding to the cell where the terminal device 240 currently resides. In some embodiments of the present application, the access network device 220 and the access network device 230 can be the same access 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.

[0083] The access network device in the embodiment of the present application may be a device used to communicate with a terminal device, for example, the access network device may be a base station.

[0084] To facilitate understanding of the embodiments of the present application, the relevant terms involved in the embodiments of the present application are described in detail below.

[0085] 1. Non-standalone architecture (NSA)

[0086] NSA is a network mode of 5G. In NSA mode, 5G base stations can access the 4G core network through some 4G base stations, where these 4G base stations can be called anchor stations or control plane anchors. When the terminal device resides at the anchor station, the terminal device can interact with the 5G base station through the anchor station, so that the user can access the Internet through 5G.

[0087] 2. Cell

[0088] It is described from the perspective of resource management or mobility management or service unit. The coverage of each access network device can be divided into one or more cells, and the cell can be regarded as consisting of certain frequency domain resources. The cell can be an area within the coverage of the wireless network of the access network device. In an embodiment of the present application, different cells can correspond to different access network devices. For example, the access network device to which cell #1 belongs and the access network device to which cell #2 belongs can be different access network devices, such as a base station. That is to say, cell #1 and cell #2 can be managed by different base stations. In this case, it can be said that cell #1 and cell #2 are co-stationed, or in other words, co-stationed. The access network device to which cell #1 belongs and the access network device to which cell #2 belongs can also be different radio frequency processing units of the same base station, for example, a radio remote unit (RRU), that is, cell #1 and cell #2 can be managed by the same base station, have the same baseband processing unit and intermediate frequency processing unit, but have different radio frequency processing units. This application does not specifically limit this.

[0089] Cell switching refers to the switching that needs to be performed in order to maintain uninterrupted communication of the terminal device when the terminal device moves from one cell to another in a wireless communication system. In this article, the service cell, which may also be referred to as the source cell, indicates the cell that provides services to the terminal device before the switching; the cell selected by the terminal device or the cell where the terminal device resides, which may also be referred to as the target cell, indicates the cell that provides services to the terminal device after the switching. In other words, the service cell is the service cell before the terminal device performs the cell switching, and the target cell is the service cell after the terminal device performs the cell switching. It should be understood that the cell is the coverage area of ​​the access network device, the source cell corresponds to the source access network device (such as the source base station), and the target cell corresponds to the target access network device (such as the target base station).

[0090] 3. Anchor Community

[0091] Anchor cells can be understood as cells covered by anchor stations. Anchor cells support evolved universal terrestrial radio access (E-UTRA) and NR dual connectivity (E-UTRA NR dual connectivity, en-dc) dual connectivity, thereby achieving dual connectivity of 5G networks and 4G networks.

[0092] 4. Band

[0093] A frequency band is a frequency range. In the embodiment of the present application, a frequency band can be understood as an identifier of an uplink frequency range and / or a downlink frequency range. For example, frequency band 1 can identify an uplink frequency range of 1920 MHz-1980 MHz and a downlink frequency range of 2110 MHz-2170 MHz.

[0094] 5. Frequency

[0095] The frequency point may be a number of a fixed frequency. A frequency band may correspond to multiple frequency points. For example, assuming that 1 is the number of the frequency 935.4 MHz, and 1 is the frequency point of a designated carrier, the designated carrier transmits a signal at a frequency of 935.4 MHz.

[0096] 6. Switching events

[0097] When the terminal device performs a cell switching, it is necessary to report a measurement report, such as reporting information such as the reference signal receiving power (RSRP), reference signal receiving quality (RSRQ), etc. The switching event can trigger the terminal device to perform signal measurement and report the measurement report. The switching events may include A1 events, A2 events, A3 events, A4 events, A5 events, A6 events, B1 events, and B2 events. Among them, the A1 event can be used to turn off inter-frequency measurement; the A2 event can be used to turn on inter-frequency measurement; the A3 event, A4 event, A5 event, A6 event, B1 event, and B2 event can be used to determine whether the terminal device performs a cell switching.

[0098] 7. QCI

[0099] QCI (QoS class identifier): each EPS (evolved packet system) bearer is assigned a QCI.

[0100] In the embodiments of the present application, various terms and English abbreviations, such as NR, NSA, VoLTE, RRC, etc., are illustrative examples given for the convenience of description and should not constitute any limitation to the present application. The present application does not exclude the possibility of defining other terms that can achieve the same or similar functions in existing or future protocols.

[0101] During a voice call on a terminal device, if the terminal device selects or reselects a cell, and the cell where the terminal device selects to reside does not support voice call services, the terminal device will experience dropped calls, thereby affecting the user experience.

[0102] In one example, some regions promote 5G NSA to enable users to access the Internet via 5G. In the 5G NSA mode, the terminal device can simultaneously connect to the NR cell through the anchor cell, so that the 5G network can be used when the terminal device resides in the anchor cell. However, the frequency bands corresponding to some anchor cells do not have VoLTE capabilities, so that after the terminal device resides in these anchor cells, calls may be dropped. Figure 3 As shown, Figure 3 3 is a flow chart of a voice call method 300. The method 300 includes the following steps:

[0103] S301. The current serving cell of the terminal device is cell 1. During a voice call of the terminal device, cell 1 sends a first reconfiguration message to the terminal device. The first reconfiguration message carries information for instructing the terminal device to switch to cell 2. Correspondingly, the terminal device receives the first reconfiguration message from cell 1.

[0104] It should be understood that the process of the terminal device voice call is achieved through information interaction between the terminal device, cell 1 and the core network device.

[0105] Optionally, before cell 1 sends the first reconfiguration message to the terminal device, the terminal device sends a measurement report to cell 1, and the measurement report carries information for indicating the signal strength of cell 1 and cell 2. Based on the measurement report, cell 1 sends the first reconfiguration message to the terminal device. Exemplarily, due to the movement of the terminal device, the signal strength of cell 1 becomes weak. After the terminal device measures the signal strength of cell 1 and cell 2 and reports the measurement report, cell 1 instructs the terminal device to switch to cell 2.

[0106] S302: In response to the first reconfiguration message, the terminal device sends a first request to cell 2, where the first request is used to request access to cell 2. Exemplarily, the first request may be a random access request or an RRC connection reestablishment request (RRC connection reestablishment request).

[0107] S303. When cell 2 does not respond to the first request, the terminal device executes S302 in a loop. When the number of retransmissions of the first request is greater than or equal to the preset maximum number of retransmissions, or the duration of the terminal device's request to access cell 2 is greater than or equal to the preset duration, the terminal device fails to randomly access cell 2, resulting in a failure in the cell switching of the terminal device, thereby triggering the RLF process.

[0108] It should be understood that in the case of a cell 2 failure, cell 2 may not respond to the first request from the terminal device, and the present application does not specifically limit the reason why cell 2 does not respond to the first request.

[0109] Optionally, the preset duration can be measured by a timer such as T304. If the time taken by the terminal device to request access to cell 2 is greater than or equal to the preset duration, it can be understood that the terminal device has not successfully accessed cell 2 when the timer such as T304 times out.

[0110] S304: The terminal device selects cell 3 as the resident cell based on the first rule of giving priority to selecting the anchor cell. Cell 3 is the anchor cell, and the frequency band corresponding to cell 3 does not have the VoLTE capability.

[0111] S305. The terminal device sends a second request to the cell 3, where the second request is used to request to reestablish the RRC connection. Correspondingly, the cell 3 receives the second request from the terminal device. Exemplarily, the second request may be an RRC connection reestablishment request.

[0112] S306. In response to the second request, cell 3 sends message 1 to the terminal device, where message 1 carries information indicating successful RRC re-establishment. Correspondingly, the terminal device receives message 1 from cell 3. Exemplarily, message 1 may be an RRC re-establishment success message.

[0113] Optionally, in response to message 1, the terminal device may also send an RRC connection re-establishment completion message to cell 3, where the RRC connection re-establishment completion message is used to indicate that the RRC connection re-establishment is completed. Correspondingly, cell 3 receives the RRC connection re-establishment completion message from the terminal device.

[0114] It should be understood that S305 and S306 are an example of reestablishing the RRC connection between the terminal device and the cell 3, and the RRC connection can be established between the terminal device and the cell 3 through other signaling interaction processes. For example, in response to the second request, the cell 3 can send an RRC connection reestablishment failure message to the terminal device, and correspondingly, the terminal device receives the RRC connection reestablishment failure message from the cell 3; then, the terminal device and the cell 3 can further establish an RRC connection through the RRC access process, which is not specifically limited in this application.

[0115] Optionally, after the terminal device establishes an RRC connection with cell 3, the terminal device may trigger a tracking area update (TAU) process and perform TAU signaling interaction between cell 3 and the core network device.

[0116] S307. After establishing an RRC connection between the terminal device and cell 3, a bearer recovery negotiation process is performed between cell 3 and the core network device. Exemplarily, cell 3 may send a third request to the core network device, and the third request is used to request configuration of a voice-dedicated bearer. Correspondingly, the core network device receives the third request from cell 3. In response to the third request, the core network device may send message 2 to the terminal device, and message 2 carries information indicating that cell 3 does not support voice call services. Correspondingly, cell 3 receives message 2 from the core network device.

[0117] S308. Cell 3 sends a second reconfiguration message to the terminal device. Correspondingly, the terminal device receives the second reconfiguration message from the cell. The second reconfiguration message does not carry information for configuring the voice dedicated bearer.

[0118] It should be understood that since the frequency band corresponding to cell 3 does not have VoLTE capability, the second reconfiguration message does not include information for configuring a voice-dedicated bearer (such as a voice-dedicated bearer corresponding to QCI=1). This causes the terminal device to be unable to transmit voice data packets to the other end, so that the user cannot hear the voice of the other end.

[0119] In S307, cell 3 and the core network device interact through signaling, so that the core network can determine that the terminal device is currently making a voice call through cell 3, and because the core network device determines that cell 3 does not support voice call services, the core network device can further instruct the terminal device to end the voice call through cell 3.

[0120] S309: The core network sends a fourth request to the cell 3, where the fourth request is used to request to terminate the call. Correspondingly, the cell 3 receives the fourth request from the core network, where the fourth request may be a BYE message.

[0121] S310: Cell 3 sends a fourth request to the terminal device. Correspondingly, the terminal device receives the fourth request from cell 3.

[0122] It should be understood that, in response to the fourth request, the terminal device terminates the current voice call, so that the user perceives that the call is dropped.

[0123] In method 300, cell 3 may be an anchor cell, and cell 3 does not have the capability of voice calls. Since the terminal device usually selects a cell according to the rule of giving priority to the anchor cell, the terminal device selects cell 3, and the terminal device drops the call. Therefore, it is urgent to provide a method to reduce the call drop rate of the terminal device.

[0124] In order to solve the above technical problems, an embodiment of the present application provides a voice call method and device. When the service cell of the terminal device is a first cell, the neighboring cells of the first cell include a second cell and a third cell that does not support voice call services, the priority of the first cell is lower than the priority of the second cell, the priority of the third cell is greater than the priority of the second cell, the signal strength of the first cell is lower than the signal strength of the second cell, and the signal strength of the third cell is greater than the signal strength of the second cell, by making the terminal device give priority to the third cell when performing cell reselection or cell selection when it is not in a voice call state, and giving priority to the second cell when the terminal device performs cell reselection or cell selection when it is in a voice call state, that is, when the terminal device is in a voice call state, when the terminal device performs cell reselection or cell selection, it gives priority to cells other than cells that do not support voice call services, thereby reducing the probability of the terminal device residing in a cell that does not support voice call services during a voice call. In this way, the call drop rate of the terminal device can be reduced, thereby improving the user experience.

[0125] Combine the following Figure 4 and Figure 5 The voice call method provided in the embodiment of the present application is introduced in detail. The embodiment shown in the present application shows the voice call method provided in the embodiment of the present application from the perspective of device interaction. The specific form and quantity of each device shown therein are only examples and should not constitute any limitation on the implementation of the method provided in the embodiment of the present application. In the embodiment of the present application, the interaction between the terminal device and the cell can be understood as the interaction between the terminal device and the access network device providing services for the cell. For ease of understanding, the method provided in the embodiment of the present application is described below with reference to the interaction between the terminal device and the cell.

[0126] It should be understood that the terminal device can be the terminal device itself, or it can be a chip, chip system or processor that supports the terminal device to implement the voice call method, or it can be a logical module or software that can implement all or part of the terminal device; the access network device can be the access network device itself, or it can be a chip, chip system or processor that supports the access network device to implement the voice call method, or it can be a logical module or software that can implement all or part of the access network device. Please do not make specific limitations on this.

[0127] Figure 44 is a flow chart of a voice call method 400 provided in an embodiment of the present application. Figure 4 As shown, the current service cell of the terminal device is the first cell, and the neighboring cells of the first cell include the second cell and the third cell. The third cell does not support voice call services, and the first cell and the second cell support voice call services.

[0128] It should be understood that the serving cell can be understood as the cell where the terminal device is currently residing or accessed. For example, if the cell currently accessed by the terminal device is the first cell, then the current serving cell is the first cell. The first cell, the second cell, and the third cell can be cells covered by the same access network device, or can be cells covered by different access network devices. For example, the first cell can be cell A in the communication system 100, the second cell can be cell B in the communication system 100, and the third cell can be cell C in the communication system 100.

[0129] The third cell not supporting the voice call service can be understood as the terminal device cannot normally make a voice call when the terminal device resides in the third cell. For example, in NSA mode, the third cell not supporting the voice call service can mean that the third cell does not have the VoLTE capability; in SA mode, the third cell not supporting the voice call service can mean that the third cell does not have the VoNR capability.

[0130] The method 400 comprises the following steps:

[0131] S401. When the terminal device resides in the first cell and is in a voice call state, and the terminal device triggers RLF and other processes or enters the IDLE state, and needs to perform cell selection or cell reselection, a first message is sent to the second cell, and the first message is used to request access to the second cell; wherein, when the terminal device sends the first message to the second cell, the priority of the first cell is lower than the priority of the second cell, the signal strength of the first cell is lower than the signal strength of the second cell, the priority of the third cell is higher than the priority of the second cell, and the signal strength of the third cell is higher than the signal strength of the second cell. Exemplarily, the first message can be a random access request or an RRC connection re-establishment message, etc.

[0132] Signal strength may refer to RSRP or RSRQ, etc. A random access request may be used to request random access; an RRC connection reestablishment message may be a message sent to a second cell during a process in which a terminal device randomly accesses a second cell. A voice call state may refer to a state of a terminal device as a calling party before terminating a call; or a state of a terminal device as a called party before terminating a call after detecting an incoming call.

[0133] It should be understood that the first message is used to request access to the second cell. After the second cell receives the first message from the terminal device, the terminal device and the second cell may also perform other signaling interactions so that the terminal device resides in the second cell. This application does not specifically limit this. Exemplarily, when the first message is an RRC connection re-establishment message, the second cell may send an RRC connection re-establishment success message to the terminal device, and correspondingly, the terminal device receives an RRC connection re-establishment success message from the second cell.

[0134] S402. When the terminal device resides in the first cell and is not in a voice call state, and the terminal device triggers a process such as RLF or enters an IDLE state and needs to perform cell selection or cell reselection, the terminal device sends a second message to the third cell, and the second message is used to request access to the third cell; wherein, when the terminal device sends the second message to the third cell, the priority of the first cell is lower than the priority of the second cell, the signal strength of the first cell is lower than the signal strength of the second cell, the priority of the third cell is higher than the priority of the second cell, and the signal strength of the third cell is higher than the signal strength of the second cell. Exemplarily, the second message may be a random access request or an RRC connection reestablishment message, etc.

[0135] It should be understood that the priority of the first cell is lower than the priority of the second cell and the priority of the third cell is higher than the priority of the second cell, which may mean that when the terminal device performs cell selection or cell reselection, the third cell is selected with a higher priority than the second cell, and the second cell is selected with a higher priority than the first cell. Exemplarily, assuming that the priority of the third cell is level 7, the priority of the second cell is level 6, and the priority of the first cell is level 5, the priority of the third cell is higher than the priority of the second cell, and the priority of the second cell is higher than the priority of the first cell, that is, when the terminal device performs cell selection or cell reselection in order of priority from high to low, the terminal device gives priority to the third cell.

[0136] Among them, in the embodiment of the present application, the priority of the first cell is lower than the priority of the second cell or the priority of the third cell is higher than the priority of the second cell, and it does not limit the priority of the cell to be expressed by a numerical value, nor does it limit that when the priority is expressed by a numerical value, the larger the numerical value, the higher the priority. Exemplarily, assuming that the priority is represented by level 1, level 2, and level 3 from high to low, the priority of the third cell is level 1, and the priority of the second cell is level 2, then the priority of the third cell is higher than the priority of the second cell, that is, when the terminal device selects or reselects a cell in order of priority from high to low, the terminal device gives priority to the third cell.

[0137] It should be understood that the priority of the third cell is greater than the priority of the second cell, the signal strength of the third cell is greater than the signal strength of the second cell, and the terminal device selects the second cell when it is in a voice call state, and selects the third cell when it is not in a voice call state. It does not limit the terminal device to select a cell with lower signal strength and lower priority when it is in a voice call state, but means that the terminal device will give priority to cells other than cells that do not support voice call services when it is in a voice call state. Exemplarily, when the priority of the third cell is lower than the priority of the second cell, and / or the signal strength of the third cell is greater than the signal strength of the second cell, and the third cell does not support voice call services, the terminal device is in a voice call state, and because the third cell does not support voice call services, the terminal device gives priority to the second cell. In addition, when the priority of the third cell is lower than the priority of the second cell, and / or the signal strength of the third cell is greater than the signal strength of the second cell, the terminal device may also select the second cell in a non-voice call state if the terminal device follows the rule of giving priority to cells with higher priorities and / or greater signal strengths.

[0138] It should be understood that the RRC connection re-establishment message can be a message sent to the third cell during the process of the terminal device randomly accessing the third cell. The second message is used to request access to the second cell. After the third cell receives the second message from the terminal device, the terminal device and the third cell can also perform other signaling interactions to enable the terminal device to reside in the third cell. This application does not make specific limitations on this. Exemplarily, when the second message is an RRC connection re-establishment message, the third cell can send an RRC connection re-establishment success message to the terminal device, and correspondingly, the terminal device receives an RRC connection re-establishment success message from the third cell.

[0139] Optionally, the situation in which the terminal device performs cell selection or cell reselection may also be: the terminal device enters an idle (IDLE) state. The IDLE state may also be understood as an RRC-IDEL state. When the terminal device is in this state, cell reselection or cell selection may be required.

[0140] The voice call method provided in the embodiment of the present application, when the service cell of the terminal device is the first cell, and the neighboring cells of the first cell include the second cell and the third cell that does not support the voice call service, if the priority of the first cell is lower than that of the second cell, the priority of the third cell is greater than that of the second cell, the signal strength of the first cell is lower than that of the second cell, and the signal strength of the third cell is greater than the signal strength of the second cell, then when the terminal device performs cell reselection or cell selection when it is not in a voice call state, the third cell is given priority; however, when the terminal device performs cell reselection or cell selection when it is in a voice call state, the second cell is given priority, that is, when the terminal device is in a voice call state, when the terminal device performs cell reselection or cell selection, it will give priority to cells other than the cells that do not support the voice call service, thereby reducing the probability of the terminal device residing in the cell that does not support the voice call service during the voice call. In this way, the call drop rate of the terminal device can be reduced, thereby improving the user experience.

[0141] Next, the implementation of S401 and S402 will be described in detail.

[0142] As an optional embodiment, S401 can be implemented in the following manner: sending a first message to the second cell based on a first preset rule, the first preset rule including at least one of the following: not selecting the cell corresponding to the first preset frequency band or the first preset frequency point, or, performing cell selection or cell reselection based on the updated priority of the cell corresponding to the first preset frequency band or the first preset frequency point, or, not giving priority to the anchor cell, the updated priority of the cell corresponding to the first preset frequency band is lower than the original priority of the cell corresponding to the first preset frequency band, and the updated priority of the cell corresponding to the first preset frequency point is lower than the original priority of the cell corresponding to the first preset frequency point; wherein, the first preset frequency band includes the frequency band corresponding to the third cell, or the first preset frequency point includes the frequency point corresponding to the third cell.

[0143] It should be understood that sending the first message to the second cell based on the first preset rule can be understood as the terminal device selecting to reside in the second cell based on the first preset rule and sending the first message to the second cell. The number of anchor cells can be one or more. And the anchor cells can include cells with voice call capabilities and / or cells without voice call capabilities. In addition, the original priority can be understood as the priority before the update. The updated priority of the cell corresponding to the first preset frequency band is lower than the original priority of the cell corresponding to the first preset frequency band, which can mean that the priority of the cell corresponding to the first preset frequency band after the update is reduced compared to before the update. The updated priority of the cell corresponding to the first preset frequency point is lower than the original priority of the cell corresponding to the first preset frequency point, which can mean that the priority of the cell corresponding to the first preset frequency point after the update is reduced compared to before the update. Exemplarily, assuming that the original priority of the cell corresponding to the first preset frequency band or the first preset frequency point is level 7, the updated priority can be level 6, where level 7 is higher than level 6.

[0144] The frequency points corresponding to the first preset frequency band may include the first preset frequency point. Exemplarily, the frequency points corresponding to the first preset frequency band are 1900 and 1800, the first preset frequency point is 1800, and the frequency points corresponding to the first preset frequency band include the first preset frequency point; the frequency points corresponding to the second preset frequency band are 1900 and 1800, the second preset frequency point is 1700, and the frequency points corresponding to the second preset frequency band do not include the second preset frequency point.

[0145] As an optional embodiment, before S401, when the terminal device establishes a voice call, method 400 also includes at least one of the following: the terminal device is prohibited from selecting the cell corresponding to the first preset frequency band or the first preset frequency point; or, the terminal device lowers the priority of the cell corresponding to the second preset frequency band or the second preset frequency point to obtain an updated priority; or, when the anchor cell does not support the voice call function, the terminal device does not give priority to selecting the anchor cell.

[0146] It should be understood that when the terminal device establishes a voice call, it can be understood that after the terminal device makes a call, or after detecting an incoming call. In the case where the terminal device defaults to giving priority to the anchor cell or the protocol stipulates that the anchor cell is given priority, the terminal device can cancel the rule of giving priority to the anchor cell.

[0147] Among them, lowering the priority of the cell corresponding to the first preset frequency band or the first preset frequency point can also be understood as lowering the priority of the first preset frequency band or the first preset frequency point. Lowering the priority of the cell corresponding to the first preset frequency band or the first preset frequency point can be achieved in a variety of ways. For example, as shown in Table 1, the neighboring cells of the first cell include cell 1, cell 2, and cell 3, wherein the frequency band 28 corresponding to cell 1 does not support voice call services, and the first preset frequency band can be frequency band 28. The terminal device can reduce the priority of the first preset frequency band by reducing the signal strength of the cell corresponding to the first preset frequency band. For example, if the signal strength of cell 1 measured by the terminal device is -84dBm, in order to reduce the priority of cell 1, the terminal device can subtract a positive value from the signal strength of cell 1, such as subtracting 30dBm, thereby reducing the signal strength of cell 1. In this way, the signal strength of cell 1 is updated to -114dBm, and the probability of the terminal device selecting cell 1 is reduced. Alternatively, the terminal device may also lower the priority of the cell corresponding to the first preset frequency band to after the cell corresponding to the preset signal strength. For example, if the preset signal strength is -100dBm, the terminal device lowers the priority of cell 1 to after cell 2. When the terminal device performs subsequent cell selection, it can give priority to cell 2 with a signal strength greater than or equal to -100dBm.

[0148] Table 1

[0149] Cell ID Frequency band identification Signal strength / dBm 1 28 -84 2 38 -95 3 40 -110

[0150] It should be understood that the manner in which the terminal device reduces the priority of the cell corresponding to the first preset frequency point is similar to the manner in which the priority of the cell corresponding to the first preset frequency band is reduced, and the above description may be referred to, and no further description is given here. In addition, the present application does not specifically limit the manner in which the terminal device reduces the priority of the cell corresponding to the first preset frequency band or the first preset frequency point.

[0151] As an optional embodiment, the first preset rule may further include: giving priority to non-anchor cells. In this way, when the anchor cell does not have voice call capability, the terminal device may give priority to staying in the non-anchor cell during the voice call, thereby helping to reduce the call drop rate of the terminal device.

[0152] As an optional embodiment, S402 may be implemented in the following manner: sending a second message to the third cell based on a second preset rule, where the second preset rule includes preferentially selecting an anchor cell.

[0153] It should be understood that sending the second message to the third cell based on the second preset rule can be understood as the terminal device selecting to reside in the third cell based on the second preset rule and sending the second message to the third cell. The second preset rule is a rule for the terminal device to select a cell or reselect a cell in a non-voice call state. By enabling the terminal device to preferentially select an anchor cell, the probability of the terminal device residing in the anchor cell is greater, and the terminal device can preferentially use the 5G network, which can improve the user experience.

[0154] Optionally, the third cell can be an anchor cell under NSA, so that according to the second preset rule, the terminal device can give priority to the third cell, so that the terminal device can give priority to using the 5G network.

[0155] Optionally, the second preset rule may also include: giving priority to cells with higher priorities, and / or giving priority to cells with greater signal strengths. This helps the terminal device to preferentially reside in cells with better signal conditions, thereby improving the user experience.

[0156] In the embodiment of the present application, the first preset frequency band and / or the first preset frequency point included in the first preset rule may be determined in a variety of ways. Two ways of determining the first preset frequency band and / or the first preset frequency point are described in detail below.

[0157] Mode 1: the first preset frequency band and / or the second preset frequency band is a preset frequency band; and / or the first preset frequency point or the second preset frequency point is a preset frequency point.

[0158] As an optional embodiment, the first preset frequency band and / or the second preset frequency band is a preset frequency band that does not have voice call capability; and / or the first preset frequency point and / or the second preset frequency point is a preset frequency point that does not have voice call capability, and / or there is a first anchor cell in the anchor cell that does not support voice call service.

[0159] It should be understood that the anchor cell may refer to an anchor cell under NSA. The number of anchor cells may be one or more, and the number of first anchor cells that do not support voice call services included in the anchor cells may be one or more. Not having voice call capability may be understood as not having VoLTE capability.

[0160] Optionally, the first preset frequency band includes frequency band B28 under the Long Term Evolution LTE communication technology.

[0161] For example, Malaysia is currently promoting 5G NSA nationwide, and the cell corresponding to the frequency band B28 is used as the anchor cell, so that when the terminal device accesses the cell corresponding to B28, it can access the Internet through 5G. However, since the network provider does not provide VoLTE voice services for B28, when the terminal device is in a voice call state and accesses the cell corresponding to B28, a call drop will occur. In order to solve this problem, in a possible implementation method, before the terminal device leaves the factory, B28 that does not support voice call services can be preset. In this way, before the terminal device is in a voice call state and performs cell reselection or cell selection, the rule of giving priority to the anchor cell can be canceled, and the priority of the cell corresponding to B28 can be lowered, so that the first preset rule can be determined as: not giving priority to the anchor cell, and, based on the updated priority selection of the cell corresponding to B28, the updated priority is lower than the original priority. This allows the terminal device to not give priority to the anchor cell when performing cell reselection or cell selection, and because the priority of the cell corresponding to B28 is lowered, the probability of the terminal device selecting the cell corresponding to B28 is lower, thereby reducing the call drop rate of the terminal device; in addition, when the signal strength of the anchor cell outside the cell corresponding to B28 is strong, the terminal device can select the anchor cell outside the cell corresponding to B28, which has little impact on the anchor cell outside the cell corresponding to B28, helping the terminal device to select a cell with better signal conditions, thereby improving user experience.

[0162] In a possible implementation, the first preset frequency may include a frequency corresponding to the first anchor cell, and / or the first preset frequency band may include a frequency band corresponding to the first anchor cell. Through such a technical solution, during a voice call of a terminal device, if the terminal device needs to select a cell, the probability of the terminal device selecting the first anchor cell is low, which helps the terminal device to give priority to cells with VoLTE capabilities, thereby helping to reduce dropped calls of the terminal device and improve user experience.

[0163] Exemplarily, before the terminal device leaves the factory, the terminal device stores an identifier of the first preset frequency band that does not support voice call services, and the cell corresponding to the first preset frequency band is an anchor cell; then the first preset rule may include: not giving priority to the anchor cell, and making a selection based on the updated priority of the cell corresponding to the first preset frequency band, the updated priority being lower than the original priority of the cell corresponding to the first preset frequency band. In this way, according to not giving priority to the anchor cell, the terminal device may not give priority to the cell corresponding to the first preset frequency band; at the same time, since the updated priority of the cell corresponding to the first preset frequency band is lower than the original priority, that is, the priority of the cell corresponding to the first preset frequency band is lowered, the terminal device may give priority to the remaining cells with higher priorities or stronger signal strengths, so that the probability of the terminal device residing in the cell corresponding to the first preset frequency band is small, which can reduce the call drop rate of the terminal device.

[0164] In another possible implementation, the terminal device is preset with an identifier of the first preset frequency band and / or the first preset frequency point that does not support the voice call service, and the first preset rule includes: not selecting the cell corresponding to the first preset frequency band and / or the first preset frequency point. In this way, when the terminal device is in a voice call state and needs to select or reselect a cell, the terminal device does not select the cell corresponding to the first preset frequency band and / or the first preset frequency point that does not support the voice call service, which can reduce the call drop rate of the terminal device and improve the user experience.

[0165] Method 2: The first preset frequency band is a frequency band determined by the terminal device not to support voice call capability; and / or, the first preset frequency point is a frequency point determined by the terminal device not to support voice call capability.

[0166] To describe the second method in detail, based on the above method 400, the embodiment of the present application provides a voice call method 500, such as Figure 5 As shown, the method 500 includes the following steps:

[0167] S501. The current service cell of the terminal device is the third cell. When the terminal device establishes a voice call in the third cell, the third cell sends a third message to the terminal device, and the third message may be a reconfiguration message. Correspondingly, the terminal device receives a third message from the third cell, and the third message is used to instruct the terminal device to perform a preset event measurement. The third message carries information for indicating a target frequency and at least one threshold value. The preset event is an A5 event. The at least one threshold value includes a first threshold value and a second threshold value. The first threshold value is greater than the second threshold value. The cell corresponding to the target frequency is a neighboring cell of the third cell. The first threshold value is a threshold value of the signal strength of the third cell, and the second threshold value is a threshold value of the signal strength of the neighboring cell of the third cell.

[0168] It should be understood that the number of frequencies included in the target frequency point may be one or more. The target frequency point may also be referred to as a measurement frequency point. After receiving the third message, the terminal device may measure the signal strength of the cell corresponding to the target frequency point carried in the third message. The preset event may also be referred to as a switching event. The A5 event may refer to an event in which the terminal device measures whether the signal strength of the current serving cell is less than or equal to the first threshold, and whether the signal strength of the neighboring cell of the serving cell is greater than or equal to the second threshold, and reports the measurement result. The first threshold is the threshold value of the signal strength of the third cell, which can be understood as the first threshold value being used to compare with the signal strength of the third cell, that is, to determine whether the signal strength of the third cell is less than or equal to the first threshold; the second threshold is the threshold value of the signal strength of the neighboring cell of the third cell, which can be understood as the second threshold value being used to compare with the signal strength of the neighboring cell of the third cell, that is, to determine whether the signal strength of the neighboring cell of the third cell is greater than or equal to the second threshold.

[0169] Optionally, the third message may be an RRC reconfiguration message, which carries measurement control information (measConfig), and the measurement control information includes a measurement object ID (measObjectId) and a report configuration ID (reportConfigId); wherein the measurement object ID includes a target frequency, and the report configuration ID includes information used to indicate a preset event, such as a preset event identifier, etc.

[0170] Optionally, before S501, the terminal device sends a fifth request for requesting a voice call to the third cell, and correspondingly, the third cell receives the fifth request from the terminal device and sends the fifth request to the core network device; in response to the fifth request, the third cell receives a fifth message from the core network device and sends the fifth message to the terminal device, and correspondingly, the terminal device receives a fifth message from the third cell, and the fifth message carries information indicating that the fifth request is being processed. The fifth request may also be an invite message, and the fifth message may be a 100trying message.

[0171] S502. When at least one threshold satisfies a preset condition, determine a first preset frequency band or a first preset frequency point at least based on the frequency band corresponding to the target frequency point and the frequency band corresponding to the third cell, wherein the preset condition includes a first preset condition, the first preset condition is that the first threshold is greater than or equal to the first preset threshold, and the second threshold is less than or equal to the second preset threshold, and the first preset threshold is greater than the second preset threshold.

[0172] It should be understood that when the first threshold is greater than or equal to the first preset threshold, it means that the first threshold is high, and the signal strength of the serving cell is usually less than or equal to the first threshold; when the second threshold is less than or equal to the second preset threshold, it means that the second threshold is low, and the signal strength of the neighboring cell is usually greater than or equal to the second threshold. Therefore, based on the first threshold and the second threshold, after the terminal device performs cell measurement, the probability of switching to the neighboring cell is relatively high. Based on this, the terminal device can determine that the first threshold and the second threshold are not set reasonably, and the current switching event may be an unreasonable switching event. Furthermore, the terminal device can determine that the frequency or frequency band corresponding to the current serving cell may not support voice call services.

[0173] For example, the first preset threshold may be -40dBm, and the second preset threshold may be -120dBm. When the first threshold is greater than or equal to -40dBm, the signal strength of the third cell is usually less than the first threshold; when the second threshold is less than or equal to -120dBm, the signal strength of the neighboring cell of the third cell is usually greater than the second threshold, and after the terminal device performs signal measurement and reports the measurement report, the terminal device usually switches to the neighboring cell of the third cell, that is, the first threshold and the second threshold are set unreasonably.

[0174] When the terminal device determines that the frequency or frequency band corresponding to the third cell does not have the capability for voice calls, since the target frequency indicated by the serving cell in the third message usually supports voice call services, the terminal device can determine whether the frequency corresponding to the third cell does not have the capability for voice calls or the frequency band corresponding to the third cell does not have the capability for voice calls by comparing the frequency band corresponding to the target frequency with the frequency band corresponding to the third cell currently stationed, thereby determining the first preset frequency band or the first preset frequency.

[0175] Through the above-mentioned technical solution, the terminal device can determine the frequency or frequency band that does not have the capability of voice calls. Compared with the preset frequency band or frequency point that does not have the capability of voice calls, the terminal device can identify the frequency or frequency band that does not have the capability of voice calls other than the preset frequency band or frequency point. In this way, when the terminal device selects a cell according to the first preset rule, the probability of the terminal device selecting the cell corresponding to the frequency or frequency band that does not have the capability of voice calls is relatively small, which can further reduce the call drop rate of the terminal device and improve the user experience.

[0176] In some possible implementations, the preset event may be other switching events, such as an A4 event, etc. Correspondingly, the number included in at least one threshold may be one. Among them, the A4 event may refer to an event in which the terminal device determines that the signal strength of the neighboring cell of the current service cell is greater than or equal to the third threshold. At the same time, the preset condition may be that the third threshold is less than or equal to the third preset threshold. When the third threshold is less than or equal to the third preset threshold, it means that the third threshold is small, then the probability that the signal strength of the neighboring cell of the service cell is greater than the third threshold is greater, then the probability that the terminal device switches to the neighboring cell of the service cell is greater, indicating that the third threshold setting is unreasonable, and the terminal device can determine that the frequency or frequency band corresponding to the service cell does not support voice call services.

[0177] In a possible implementation, the preset condition further includes a second preset condition, where the second preset condition is that the terminal device receives a message from a current serving cell for instructing cell switching.

[0178] It should be understood that since the unreasonable settings of the first threshold and the second threshold may be caused by abnormalities in the access network equipment, the first preset condition and the second preset condition are used in coordination. When the first threshold and the second threshold are set unreasonably and the terminal device receives a message from the current service cell to indicate a cell switch, it can be more accurately determined that the current service cell of the terminal device does not support voice call services, thereby making the first preset frequency point or the first preset frequency band determined by the terminal device more accurate.

[0179] S503: In response to the third message, the terminal device sends a measurement report to the third cell. Correspondingly, the third cell receives the measurement report from the terminal device, the measurement report including signal strength information of the third cell and signal strength information of at least one cell corresponding to the target frequency, the at least one cell including the first cell.

[0180] It should be understood that the at least one cell corresponding to the target frequency point may be all or part of the cells corresponding to the target frequency point, or may be the cell with the largest signal strength among the cells corresponding to the target frequency point. In the case where the number of the at least one cell is one, the at least one cell is the first cell. The first cell may be the cell with the largest signal strength among the at least one cell. In addition, the measurement report may further include an identifier of the at least one cell.

[0181] S504: Based on the measurement report, the third cell sends a fourth message to the terminal device. Correspondingly, the terminal device receives a fourth message from the third cell, and the fourth message is used to instruct the terminal device to switch to the first cell.

[0182] It should be understood that S502 may be executed simultaneously with S503 and S504, and S502 may also be executed after S504 or before S504, and this application does not make any specific limitation on this.

[0183] S505. In response to the fourth message, the terminal device accesses the first cell.

[0184] It should be understood that the terminal device accesses the first cell, which can also be understood as the terminal device residing in the first cell. The terminal device can access the first cell through an RRC access procedure, or the terminal device can access the first cell through an RRC access procedure and a TAU procedure in sequence.

[0185] S506: When the terminal device is in a voice call state and triggers an RLF process, the terminal device selects a second cell based on a first preset rule.

[0186] It should be understood that the current service cell of the terminal device is the first cell, the neighboring cells of the first cell include the second cell and the third cell, the priority of the first cell is lower than the priority of the second cell, the priority of the third cell is greater than or equal to the priority of the second cell, the signal strength of the first cell is lower than the signal strength of the second cell, and the signal strength of the third cell is greater than or equal to the signal strength of the second cell.

[0187] S507. The terminal device accesses the second cell.

[0188] It should be understood that the terminal device can access the second cell through the RRC access process, for example, the terminal device sends a first message (RRC connection re-establishment message) to the second cell; then the second cell sends an RRC connection re-establishment success message to the terminal device. S506 and S507 are similar to the implementation of S401, and can refer to the above description, which will not be repeated here.

[0189] Optionally, after the terminal device resides in the second cell, if the voice call of the terminal device ends, cell selection or cell reselection can be performed through S508.

[0190] S508. After the voice call of the terminal device ends, the terminal device selects a third cell based on a second preset rule, where the second preset rule includes giving priority to selecting an anchor cell.

[0191] S509. The terminal device sends a second message to the third cell, where the second message is used to request access to the third cell.

[0192] It should be understood that the implementation of S508 and S509 is similar to that of S402, and reference may be made to the above description, which will not be repeated here.

[0193] In method 500, S501 to S507 are executed when the terminal device is in a voice call state, that is, when the terminal device is in a voice call state, the terminal device selects a resident cell based on a first preset rule; when the terminal device is not in a voice call state, the terminal device can select a resident cell based on a second preset rule. In this way, on the one hand, when the terminal device is making a voice call, the probability of the terminal device resident in a cell that does not support voice call services can be reduced, thereby reducing the call drop rate of the terminal device. On the other hand, when the terminal device is not making a voice call, the terminal device can give priority to a cell with stronger signal strength or an anchor cell, which can make the network condition of the terminal device better, thereby improving the user experience. Exemplarily, assuming that the terminal device does not give priority to the anchor cell when it is in a voice call state, but gives priority to the anchor cell in a non-voice state, in this way, when the anchor cell does not have the ability to make voice calls, on the one hand, the anchor cell is not given priority during the voice call, so that the probability of the terminal device selecting the anchor cell is lower, which helps to reduce the phenomenon of dropped calls of the terminal device. On the other hand, when it is not in a voice call state, the anchor cell is given priority, which allows the terminal device to use the 5G network, thereby improving the user experience.

[0194] Next, the method for determining the first preset frequency point and the first preset frequency band in S502 is described.

[0195] In a possible implementation, S502 may be implemented in the following manner: when the frequency band corresponding to the target frequency point is different from the frequency band corresponding to the third cell, the first preset frequency band includes the frequency band corresponding to the third cell.

[0196] It should be understood that the target frequency is a frequency with voice call capability indicated by the third cell to the terminal device. Therefore, when the frequency band corresponding to the target frequency is different from the frequency band corresponding to the third cell, it means that the terminal device needs to switch to a cell corresponding to a frequency band other than the frequency band corresponding to the third cell, indicating that the frequency band corresponding to the third cell may not have voice call capability, and therefore, the first preset frequency band includes the frequency band corresponding to the third cell.

[0197] In another possible implementation, S502 may be implemented in the following manner: when the frequency band corresponding to the target frequency is the same as the frequency band corresponding to the third cell, and the target frequency is different from the frequency corresponding to the third cell, the first preset frequency includes the frequency corresponding to the third cell.

[0198] It should be understood that the frequency band corresponding to the target frequency is the same as the frequency band corresponding to the third cell, indicating that the frequency band corresponding to the third cell has voice call capabilities. Therefore, the terminal device does not need to switch frequency bands; the target frequency is different from the frequency corresponding to the third cell, indicating that the terminal device needs to switch to a cell corresponding to a frequency other than the frequency corresponding to the third cell, indicating that the frequency corresponding to the third cell may not have voice call capabilities. Therefore, the first preset frequency includes the frequency corresponding to the third cell.

[0199] It can be seen from the above-mentioned determination method of the first preset frequency point and the first preset frequency band that in method 2, the determination process of the first preset frequency band and the first preset frequency point is related to the frequency point and frequency band of the third cell. Therefore, the situation of the third cell is different, which makes the first preset frequency point / first preset frequency band determined by the terminal device different, and further makes the first preset rule different. Below, several different situations of the first preset rule are described.

[0200] Case 1: The third cell is an anchor cell, and the terminal device determines the first preset frequency band according to the frequency band corresponding to the target frequency point and the frequency band corresponding to the third cell, and the first preset frequency band includes the frequency band corresponding to the third cell. Then the first preset rule includes at least one of the following: not selecting the cell corresponding to the first preset frequency band, or, selecting based on the updated priority of the cell corresponding to the first preset frequency band, or, not giving priority to the anchor cell, and the updated priority of the cell corresponding to the first preset frequency band is lower than the original priority of the cell corresponding to the first preset frequency band.

[0201] Case 2: The third cell is an anchor cell, and the terminal device determines the first preset frequency according to the frequency band corresponding to the target frequency and the frequency band corresponding to the third cell, and the first preset frequency includes the frequency corresponding to the third cell. Then the first preset rule includes at least one of the following: not selecting the cell corresponding to the first preset frequency, or, selecting based on the updated priority of the cell corresponding to the first preset frequency, or, not giving priority to the anchor cell, and the updated priority of the cell corresponding to the first preset frequency is lower than the original priority of the cell corresponding to the first preset frequency.

[0202] Case 3: the third cell is not an anchor cell, and the terminal device determines the first preset frequency band according to the frequency band corresponding to the target frequency point and the frequency band corresponding to the third cell, and the first preset frequency band includes the frequency band corresponding to the third cell. Then the first preset rule includes: not selecting the cell corresponding to the first preset frequency band, or selecting based on the updated priority of the cell corresponding to the first preset frequency band, and the updated priority of the cell corresponding to the first preset frequency band is lower than the original priority of the cell corresponding to the first preset frequency band.

[0203] Case 4: The third cell is not an anchor cell, and the terminal device determines the first preset frequency based on the frequency band corresponding to the target frequency and the frequency band corresponding to the third cell, and the first preset frequency includes the frequency corresponding to the third cell. The first preset rule includes: not selecting the cell corresponding to the first preset frequency, or selecting based on the updated priority of the cell corresponding to the first preset frequency, and the updated priority of the cell corresponding to the first preset frequency is lower than the original priority of the cell corresponding to the first preset frequency.

[0204] In addition, in method 500, in the first case, the voice call process in which the terminal device selects the second cell based on the first preset rule (i.e., the process of S506) may be a voice call established before S501, that is, during the process of executing S501 to S507, the terminal device is always in the same voice call; in the second case, the voice call process in which the terminal device selects the second cell based on the first preset rule (i.e., the process of S506) may also be a voice call established subsequently after the voice call established before S501 ends, and this application does not make any specific limitations on this.

[0205] The first case and the second case are described below.

[0206] In the first case, before S501, the terminal device establishes a voice call, and before the voice call ends, the terminal device determines the first preset frequency or the first preset frequency band, and selects the second cell based on the first preset rule, that is, S501 to S507 are all performed during one voice call.

[0207] In the second case, before S501, at the first moment, the terminal device establishes a first voice call, and before the first voice call ends, the terminal device determines and stores the first preset frequency or the first preset frequency band; then the terminal device ends the first voice call; at the second moment, the terminal device establishes a second voice call, and needs to select a cell, and the terminal device selects the cell based on the first preset rule, and the first preset rule is determined based on the first preset frequency or the first preset frequency band determined during the first voice call, wherein the second moment is later than the first moment. Exemplarily, it is assumed that the third cell is determined as the anchor cell during the first voice call, and it is determined that the first preset frequency includes the frequency corresponding to the third cell. Then the first preset rule may include at least one of the following: not selecting the cell corresponding to the first preset frequency, or, selecting based on the updated priority of the cell corresponding to the first preset frequency, or, not giving priority to the anchor cell, and the updated priority is lower than the original priority of the cell corresponding to the preset frequency. In the second voice call, the terminal device may select the second cell based on the first preset rule.

[0208] As an optional embodiment, the first cell, the second cell and the third cell are LTE cells; or, not supporting the voice call service means not supporting the IMS voice call service.

[0209] It should be understood that when the first cell, the second cell and the third cell are LTE cells, not supporting voice call services can be understood as not having VoLTE capabilities.

[0210] It should be understood that the order of execution of the above methods does not necessarily mean the order in which they are executed. The order in which each process is executed should be determined by its function and internal logic.

[0211] Combination of the above Figure 4 and Figure 5 , describes in detail the voice call method of the embodiment of the present application, and the following is combined with Figure 5 and Figure 6 , the voice call device of the embodiment of the present application is described in detail. The voice call includes a module or unit for executing each part of the above embodiment. The module or unit can be software, hardware, or a combination of software and hardware. The following only briefly illustrates the voice call device. For the implementation details of the solution, please refer to the description of the above method embodiment, which will not be repeated below.

[0212] Figure 6 The present invention provides a schematic block diagram of a voice call device 600. The current serving cell of the device 600 is a first cell, and the neighboring cells of the first cell include a second cell and a third cell. The third cell does not support the voice call service, and the first cell and the second cell support the voice call service. Figure 6 As shown, the device 600 includes: a sending module 601.

[0213] The sending module 601 is used to: when the device 600 resides in the first cell and is in a voice call state, and the device 600 needs to perform cell selection or cell reselection, send a first message to the second cell, and the first message is used to request access to the second cell; wherein, when the device 600 sends the first message to the second cell, the priority of the first cell is lower than the priority of the second cell, the signal strength of the first cell is lower than the signal strength of the second cell, the priority of the third cell is higher than the priority of the second cell, and the signal strength of the third cell is higher than the signal strength of the second cell; when the device 600 resides in the first cell and is not in a voice call state, and the device 600 needs to perform cell selection or cell reselection, send a second message to the third cell, and the second message is used to request access to the third cell; wherein, when the device 600 sends the second message to the third cell, the priority of the first cell is lower than the priority of the second cell, the signal strength of the first cell is lower than the signal strength of the second cell, the priority of the third cell is higher than the priority of the second cell, and the signal strength of the third cell is higher than the signal strength of the second cell.

[0214] Optionally, the sending module 601 is specifically used to: send a first message to the second cell based on a first preset rule, the first preset rule including at least one of the following: not selecting the cell corresponding to the first preset frequency band or the first preset frequency point, or, performing cell selection or cell reselection based on the updated priority of the cell corresponding to the first preset frequency band or the first preset frequency point, or, not giving priority to the anchor cell, the updated priority of the cell corresponding to the first preset frequency band is lower than the original priority of the cell corresponding to the first preset frequency band, and the updated priority of the cell corresponding to the first preset frequency point is lower than the original priority of the cell corresponding to the first preset frequency point; wherein, the first preset frequency band includes the frequency band corresponding to the third cell, or the first preset frequency point includes the frequency point corresponding to the third cell.

[0215] Optionally, the sending module 601 is specifically configured to: send a second message to the third cell based on a second preset rule, where the second preset rule is different from the first preset rule, and the second preset rule includes: preferentially selecting an anchor cell.

[0216] Optionally, the device 600 also includes a receiving module 602 and a processing module 603, the receiving module 602 is used to: during the process of the device 600 establishing a voice call in the third cell, receive a third message from the third cell, the third message is used to instruct the device 600 to perform a preset event measurement, the third message carries information used to indicate the target frequency point and information used to indicate at least one threshold value, the preset event is an A5 event, the at least one threshold value includes a first threshold value and a second threshold value, the first threshold value is greater than the second threshold value, the cell corresponding to the target frequency point is a neighboring cell of the third cell, the first threshold value is a threshold value of the signal strength of the third cell, and the second threshold value is a threshold value of the signal strength of the neighboring cell; the processing module 603 is used to: when at least one threshold value satisfies a preset condition, at least according to the target frequency point The frequency band corresponding to the target frequency point and the frequency band corresponding to the third cell are used to determine the first preset frequency band or the first preset frequency point, wherein the preset condition includes a first preset condition, the first preset condition is that the first threshold is greater than or equal to the first preset threshold, and the second threshold is less than or equal to the second preset threshold, and the first preset threshold is greater than the second preset threshold; the sending module 601 is also used to: in response to the third message, send a measurement report to the third cell, the measurement report includes the signal strength information of the third cell and the signal strength information of at least one cell corresponding to the target frequency point, and the at least one cell includes the first cell; the receiving module 602 is also used to: receive a fourth message from the third cell, the fourth message is used to instruct the device 600 to switch to the first cell; the sending module 601 is also used to: in response to the fourth message, access the first cell.

[0217] Optionally, when a frequency band corresponding to the target frequency point is different from a frequency band corresponding to the third cell, the first preset frequency band includes the frequency band corresponding to the third cell.

[0218] Optionally, when the frequency band corresponding to the target frequency is the same as the frequency band corresponding to the third cell, and the target frequency is different from the frequency corresponding to the third cell, the first preset frequency includes the frequency corresponding to the third cell.

[0219] Optionally, the situation where the device 600 needs to perform cell selection or cell reselection includes: the device 600 is in an idle IDLE state, or the device 600 triggers a radio link failure RLF process.

[0220] Optionally, the third cell is an anchor cell under non-independent networking NSA.

[0221] Optionally, the first preset frequency band includes frequency band B28 under the Long Term Evolution LTE communication technology.

[0222] Optionally, the first cell, the second cell and the third cell are LTE cells; or, not supporting voice call service means not supporting Internet Protocol IP Multimedia Subsystem IMS voice call service.

[0223] It should be understood that the device 600 here is embodied in the form of a functional module. The term "module" here may refer to an application specific integrated circuit (ASIC), an electronic circuit, a processor (such as a shared processor, a proprietary processor or a group processor, etc.) and a memory for executing one or more software or firmware programs, a merged logic circuit and / or other suitable components that support the described functions. In an optional example, those skilled in the art can understand that the device 600 can be specifically a terminal device in the above-mentioned embodiment, and the device 600 can be used to execute the various processes and / or steps corresponding to the terminal device in the above-mentioned method embodiment. To avoid repetition, it will not be repeated here.

[0224] The above-mentioned device 600 has the function of implementing the corresponding steps executed by the terminal device in the above-mentioned method; the above-mentioned function can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-mentioned function.

[0225] In some embodiments provided in this application, Figure 6 The device 600 in the embodiment may also be a chip, such as a modem processor. Correspondingly, the processing module 603 may be a transceiver circuit of the chip, which is not limited here.

[0226] Figure 7 A schematic block diagram of a voice call device 700 provided in an embodiment of the present application is shown. The device 700 includes a processor 701, a transceiver 702, and a memory 703. The processor 701, the transceiver 702, and the memory 703 communicate with each other through an internal connection path, the memory 703 is used to store instructions, and the processor 701 is used to execute the instructions stored in the memory 703 to control the transceiver 702 to send signals and / or receive signals.

[0227] It should be understood that the device 700 can be specifically a terminal device in the above embodiment, and can be used to execute the various steps and / or processes corresponding to the terminal device in the above method embodiment. Optionally, the memory 703 may include a read-only memory and a random access memory, and provide instructions and data to the processor. A part of the memory may also include a non-volatile random access memory. For example, the memory may also store information about the device type. The processor 701 may be used to execute instructions stored in the memory, and when the processor 701 executes the instructions stored in the memory, the processor 701 is used to execute the various steps and / or processes of the above method embodiment. The transceiver 702 may include a transmitter and a receiver, the transmitter may be used to implement the various steps and / or processes corresponding to the above transceiver for performing the sending action, and the receiver may be used to implement the various steps and / or processes corresponding to the above transceiver for performing the receiving action.

[0228] It should be understood that in the embodiments of the present application, the processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0229] In the implementation process, each step of the above method can be completed by an integrated logic circuit of hardware in a processor or an instruction in the form of software. The steps of the method disclosed in conjunction with the embodiment of the present application can be directly embodied as a hardware processor for execution, or a combination of hardware and software modules in a processor for execution. The software module can be located in a storage medium mature in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in a memory, and the processor executes the instructions in the memory, and completes the steps of the above method in conjunction with its hardware. To avoid repetition, it is not described in detail here.

[0230] A hardware structure of a terminal device such as Figure 8As shown, it 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, an antenna 1, an antenna 2, a mobile communication module, a wireless communication module, a sensor module, a button, a motor, an indicator, a camera, a display screen, and a SIM card slot, etc. The audio module may include a speaker, a receiver, a microphone, an earphone interface, etc., 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, a bone conduction sensor, etc.

[0231] It is to be understood that the structure illustrated in the embodiments of the present application does not constitute a specific limitation on the terminal. In other embodiments, the terminal may include more or fewer components than shown in the figure, or combine certain components, or split certain components, or arrange the components differently. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0232] The processor may include one or more processing units, for example, the processor may include an application processor (AP), a modem processor (Modem, 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 an operation control signal according to the instruction opcode and timing signal to complete the control of fetching and executing instructions.

[0233] The wireless communication function of the terminal can be implemented through antenna 1, antenna 2, mobile communication module, wireless communication module, and Modem, etc. In some embodiments, the antenna 1 of the terminal is coupled with the mobile communication module, and the antenna 2 is coupled with the wireless communication module, so that the terminal can communicate with the network side device and other terminals through wireless communication technology.

[0234] In addition, operating systems are running 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.

[0235] The operating system of the terminal can adopt a layered architecture, an event-driven architecture, a micro-core architecture, a micro-service architecture, or a cloud architecture. The embodiment of the present application takes the Android system of the layered architecture as an example to illustrate the hardware and software structure of the terminal. It should be noted that although the embodiment of the present application is illustrated by taking the Android system as an example, its basic principle is also applicable to terminals based on operating systems such as iOS or Windows.

[0236] Fig. 9 A system including a terminal device and a base station is shown, and then the specific software structure diagram of the terminal device is as follows Fig. 9 As shown. The software structure adopts a layered architecture, which divides the software into several layers, each layer has a clear role and division of labor. The layers communicate with each other through software interfaces. Taking the Android system, the Android system running on the AP as an example, in some embodiments, the Android system is divided into five layers, from top to bottom, namely, the application layer, the application framework layer (framework), the Android runtime (android runtime) and the system library, the hardware abstraction layer (HAL) and the system kernel layer (kernel).

[0237] Among them, the application layer may include a series of application packages. Application packages may include camera, gallery, calendar, call, map, WLAN, Bluetooth, music, video, short message and other APPs. The application layer may also include system UI (system UI). System UI is used to display the terminal interface, such as displaying the signal icon corresponding to the SIM card, displaying the call interface, etc. The application framework layer provides an application programming interface (API) and a programming framework for the applications in the application layer. The application framework layer includes some predefined functions. For example, the application framework layer may include a window manager, a content provider, a view system, a phone manager, a resource manager, a notification manager, etc. The phone manager is used to provide call functions for the terminal, such as management of call status (including connecting, hanging up, etc.). The phone manager is in Fig. 9 The application framework layer may also include a radio interface layer (RIL), and a modem processor (Modem) may exchange information with the telephony through the RIL.

[0238] Modem may include NAS (non-access stratum, non-access layer) layer, RRC (radio resource control, radio resource control) layer, packet data convergence protocol (packet data convergence protocol, PDCP) layer, radio link layer control protocol (radio link control, RLC) layer, medium access control layer (medium access control layer, MAC) layer and physical (physical, PHY) layer. The aforementioned layers can be software modules. Modem can interact with the base station through the antenna.

[0239] Some embodiments of the present application provide a chip system, which is applied to a terminal. The chip system includes at least one processor and an interface, and the interface is used to receive instructions and transmit them to at least one processor; at least one processor executes the instructions so that the terminal executes the above-mentioned paging message processing method. Among them, the chip system can be a modem, or a system on chip (system on chip, Soc) including a modem, and the above-mentioned method can be implemented by a modem.

[0240] The present application also provides a computer-readable storage medium, which is used to store a computer program, and the computer program is used to implement the method shown in the above method embodiment.

[0241] The present application also provides a computer program product, which includes a computer program (also referred to as code or instruction). When the computer program runs on a computer, the computer can execute the method shown in the above method embodiment.

[0242] Those of ordinary skill in the art will appreciate that the modules 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 to exceed the scope provided by the embodiments of the present application.

[0243] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and modules described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0244] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the modules is only a logical function division. There may be other division methods in actual implementation, such as multiple modules 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 through some interfaces, indirect coupling or communication connection of devices or modules, which can be electrical, mechanical or other forms.

[0245] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed on multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0246] In addition, each functional module in each embodiment of the present application may be integrated into one processing module, or each module may exist physically separately, or two or more modules may be integrated into one module.

[0247] If the function is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution provided in the embodiment of the present application is essentially or part of the prior art that contributes to the prior art or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk and other media that can store program code.

[0248] The above is only a specific implementation method provided by the embodiment of the present application, but the protection scope of the embodiment of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or replacements within the technical scope disclosed in the embodiment of the present application, which should be included in the protection scope of the embodiment of the present application. Therefore, the protection scope of the embodiment of the present application should be based on the protection scope of the claims.

Claims

1. A voice call method, characterized in that: The current serving cell of the terminal device is a first cell, the neighboring cells of the first cell include a second cell and a third cell, the third cell does not support a voice call service, and the first cell and the second cell support a voice call service, and the method includes: When the terminal device resides in the first cell and is in a voice call state, and the terminal device needs to perform cell selection or cell reselection, a first message is sent to the second cell, where the first message is used to request access to the second cell; wherein, when the terminal device sends the first message to the second cell, the priority of the first cell is lower than the priority of the second cell, the signal strength of the first cell is lower than the signal strength of the second cell, the priority of the third cell is higher than the priority of the second cell, and the signal strength of the third cell is higher than the signal strength of the second cell; When the terminal device resides in the first cell and is not in a voice call state, and the terminal device needs to perform cell selection or cell reselection, a second message is sent to the third cell, and the second message is used to request access to the third cell; wherein, when the terminal device sends the second message to the third cell, the priority of the first cell is lower than the priority of the second cell, the signal strength of the first cell is lower than the signal strength of the second cell, the priority of the third cell is higher than the priority of the second cell, and the signal strength of the third cell is higher than the signal strength of the second cell.

2. The method according to claim 1, characterized in that The sending the first message to the second cell includes: The first message is sent to the second cell based on a first preset rule, where the first preset rule includes at least one of the following: not selecting a cell corresponding to a first preset frequency band or a first preset frequency point, or performing cell selection or cell reselection based on an updated priority of a cell corresponding to the first preset frequency band or the first preset frequency point, or not giving priority to an anchor cell, where the updated priority of the cell corresponding to the first preset frequency band is lower than the original priority of the cell corresponding to the first preset frequency band, and the updated priority of the cell corresponding to the first preset frequency point is lower than the original priority of the cell corresponding to the first preset frequency point; The first preset frequency band includes a frequency band corresponding to the third cell, or the first preset frequency point includes a frequency point corresponding to the third cell.

3. The method according to claim 2, characterized in that The sending the second message to the third cell includes: The second message is sent to the third cell based on a second preset rule, where the second preset rule is different from the first preset rule, and the second preset rule includes: preferentially selecting an anchor cell.

4. The method according to claim 2 or 3, characterized in that: Before the terminal device accesses the first cell, the terminal device resides in the third cell; The method further comprises: In the process of the terminal device establishing a voice call in the third cell, receiving a third message from the third cell, the third message is used to instruct the terminal device to perform preset event measurement, the third message carries information for indicating a target frequency and information for indicating at least one threshold, the preset event is an A5 event, the at least one threshold includes a first threshold and a second threshold, the first threshold is greater than the second threshold, the cell corresponding to the target frequency is a neighboring cell of the third cell, the first threshold is a threshold value of the signal strength of the third cell, and the second threshold is a threshold value of the signal strength of the neighboring cell of the third cell; In a case where the at least one threshold satisfies a preset condition, determining the first preset frequency band or the first preset frequency point at least according to a frequency band corresponding to the target frequency point and a frequency band corresponding to the third cell, wherein the preset condition includes a first preset condition, the first preset condition being that the first threshold is greater than or equal to the first preset threshold value, and the second threshold is less than or equal to the second preset threshold value, and the first preset threshold value is greater than the second preset threshold value; In response to the third message, sending a measurement report to the third cell, the measurement report including signal strength information of the third cell and signal strength information of at least one cell corresponding to the target frequency point, the at least one cell including the first cell; receiving a fourth message from the third cell, where the fourth message is used to instruct the terminal device to switch to the first cell; In response to the fourth message, access the first cell.

5. The method according to claim 4, characterized in that The determining the first preset frequency band or the first preset frequency point at least according to the frequency band corresponding to the target frequency point and the frequency band corresponding to the third cell includes: In a case where a frequency band corresponding to the target frequency point is different from a frequency band corresponding to the third cell, the first preset frequency band includes a frequency band corresponding to the third cell.

6. The method according to claim 4, characterized in that The terminal device determines the first preset frequency band or the first preset frequency point at least according to the frequency band corresponding to the target frequency point and the frequency band corresponding to the third cell, including: When the frequency band corresponding to the target frequency is the same as the frequency band corresponding to the third cell, and the target frequency is different from the frequency corresponding to the third cell, the first preset frequency includes the frequency corresponding to the third cell.

7. The method according to any one of claims 2 to 6, characterized in that The first preset frequency band includes frequency band B28 under the long term evolution LTE communication technology.

8. The method according to any one of claims 1 to 7, characterized in that The situations where the terminal device needs to perform cell selection or cell reselection include: The terminal device is in an idle IDLE state, or the terminal device triggers a radio link failure RLF process.

9. The method according to any one of claims 1 to 8, characterized in that The third cell is an anchor cell under non-independent networking NSA.

10. The method according to any one of claims 1 to 9, characterized in that The method further comprises at least one of the following: The first cell, the second cell and the third cell are LTE cells; or, The non-support of voice call service refers to non-support of Internet Protocol IP Multimedia Subsystem IMS voice call service.

11. A voice communication device, characterized in that: include: A processor, wherein the processor is coupled to a memory, wherein the memory is used to store a computer program, and when the processor calls the computer program, the device is caused to execute the method according to any one of claims 1 to 10.

12. A chip, characterized in that: The chip includes at least one processor, configured to implement the functions involved in the method according to any one of claims 1 to 10.

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