Cell switching method, terminal equipment and storage medium

Abstract

The invention provides a cell switching method, terminal equipment and a storage medium, and relates to the technical field of communication. The probability that the terminal device is not called or dropped is reduced, and the signal quality of the cell connected with the terminal device is ensured. The cell switching method comprises: obtaining respective signal quality of a plurality of cells through signal measurement, the plurality of cells including a serving cell of a terminal device and at least one cell except the serving cell, the signal quality being a signal to interference plus noise ratio (DMRS) of respective demodulation reference signals of the plurality of cells; and when the signal quality of the serving cell is less than a first signal threshold, triggering the terminal device to switch to a target cell in the at least one cell, the target cell being a cell of which the signal quality is greater than a second signal threshold in the at least one cell, and the second signal threshold being greater than the first signal threshold.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of communication technology, and in particular to a cell switching method, terminal equipment, and storage medium. Background Art

[0002] With the development of wireless communication technology and the increasing demand for communication from users, 5G has become the preferred mode of communication for users due to its advantages such as fast transmission speed, flexible service management and good call quality compared to 2G, 3G and 4G.

[0003] When a terminal device accesses a 5G network, if the 5G network service is not interrupted, it will continue to access the network and will not switch networks. However, when the 5G network signal to which the terminal device accesses deteriorates, the terminal device may experience problems such as unreachable calls or poor call quality, thus affecting the user's call experience. Summary of the invention

[0004] The embodiments of the present application provide a cell switching method, a terminal device, and a storage medium. By timely switching cells through the terminal device, the probability of a call not being connected or a call being dropped is reduced, and the call success rate and the user's call experience are improved.

[0005] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0006] In a first aspect, a cell switching method is provided, the method comprising:

[0007] Through signal measurement, the signal quality of each of the multiple cells is obtained, wherein the multiple cells include a service cell of the terminal device and at least one cell other than the service cell, and the signal quality is a signal to interference plus noise ratio DMRS SINR of a demodulation reference signal of each of the multiple cells; when the signal quality of the service cell is less than a first signal threshold, the terminal device is triggered to switch to a target cell in at least one cell, and the target cell is a cell in at least one cell whose signal quality is greater than a second signal threshold.

[0008] The serving cell is the cell to which the terminal device is currently connected, and may also be referred to as the first cell. At least one cell other than the serving cell may also be referred to as the second cell. The signal quality here may refer to the first signal quality of the first cell, or the second signal quality of the second cell, and so on.

[0009] It can be understood that in order to avoid the situation that the terminal device may not be able to get through or the call is dropped due to the poor signal quality of the service cell of the terminal device, the terminal device can obtain the signal quality of the service cell and at least one cell other than the service cell through real-time or periodic signal measurement, and trigger the terminal device to switch to the target cell when the signal quality of the service cell is less than the first signal threshold. Since the signal quality of the target cell is higher than that of the service cell, the terminal device switches to the cell with better signal quality, reducing the probability of not getting through or the call being dropped.

[0010] Optionally, when the signal quality of the serving cell is less than a first signal threshold, triggering the terminal device to switch to a target cell in at least one cell includes:

[0011] When the signal quality of the serving cell is less than the first signal threshold, the terminal device reports a first measurement report to the first base station, where the first measurement report includes the signal qualities of the serving cell and at least one cell; receives a first switching command issued by the first base station according to the first measurement report, where the first switching command includes a radio resource control RRC reconfiguration message, where the RRC reconfiguration message includes an identifier of the target cell; and switches to the target cell according to the RRC reconfiguration message.

[0012] The identifier of the target cell may be the physical address of the target cell.

[0013] It can be understood that when the service cell and the target cell belong to the same first base station, the terminal device switches from the service cell to the target cell, which is a cell switch within the same base station.

[0014] Optionally, the serving cell and the target cell belong to the same first base station. The first base station may be a 5G base station or a 4G base station. When the serving cell and the target cell belong to the same 5G base station, the handover process of the terminal device from the serving cell to the target cell can be referred to Figure 8 The introduction process.

[0015] Optionally, the serving cell belongs to the first base station, the target cell belongs to the second base station, and the RRC reconfiguration message carries a switching instruction sent by the second base station to the first base station after receiving the resource allocation request sent by the first base station.

[0016] Assuming that the first base station is the source 5G base station and the second base station is the target 5G base station, the switching process of the terminal device from the serving cell under the 5G base station to the target cell under the 4G base station can be seen in Fig. 9 The introduction process.

[0017] Optionally, the serving cell and the target cell belong to cells under different network standards, and when the signal quality of the serving cell is less than a first signal threshold, triggering the terminal device to switch to the target cell in at least one cell includes:

[0018] When the signal quality of the serving cell is less than the first signal threshold, a second measurement report is sent to the third base station, so that the third base station sends a switching request to the first core network according to the measurement result of the second measurement report, and the first core network sends the switching request to the fourth base station through the second core network. The fourth base station sends a second switching command to the third base station through the second core network and the first core network, and the switching request includes an identifier of the target cell, and the second switching command is used to instruct the terminal device to switch to the target cell; the second switching command sent by the third base station is received, and the second switching command includes an RRC reconfiguration message; after switching to the target cell according to the RRC reconfiguration message, an RRC reconfiguration completion message is sent to the fourth base station.

[0019] It can be understood that, assuming that the serving cell belongs to a cell under a 5G base station, the target cell belongs to a cell under a 4G base station, the third base station is the source 5G base station, the first core network is the 5G core network, the fourth base station is the target 4G base station, and the second core network is the 4G core network. The switching process of the serving cell connected to the terminal device switching to the target cell can be referred to the subsequent Fig.10 The introduction process.

[0020] Optionally, the DMRS SINR corresponds to multiple parameter value intervals. After obtaining the signal quality of each of the multiple cells through signal measurement, the method further includes:

[0021] If it is determined that the DMRS SINR of the serving cell satisfies the corresponding parameter value interval, it is determined that the signal quality of the serving cell is less than the first signal threshold.

[0022] In one possible case, the terminal device obtains the DMRS SINR of the serving cell as a parameter value corresponding to the DMRS SINR. If the terminal device determines that the DMRS SINR value of the serving cell is less than the parameter value threshold, it determines that the signal quality of the serving cell is less than the first signal threshold.

[0023] In another possible case, the terminal device obtains the DMRS SINR of the serving cell as a parameter interval corresponding to the DMRS SINR. If the terminal device determines that the DMRS SINR parameter value interval of the serving cell belongs to a preset parameter value interval, it determines that the signal quality of the serving cell is less than the first signal threshold.

[0024] Optionally, the signal quality also includes at least one of a reference signal received power RSRP, a reference signal received quality RSRQ, or a signal to interference plus noise ratio SSB SINR of a synchronization broadcast block.

[0025] It can be understood that when the terminal device obtains the signal quality of each of the multiple cells through signal measurement, the terminal device can not only determine the signal quality of the multiple cells according to the DMRS SINR of the multiple cells, but also determine the signal quality of the multiple cells according to at least one of RSRP, RSRQ or SSB SINR and DMRS SINR. Compared with the terminal device determining the signal quality of the cell only through DMRS SINR, the terminal device can more accurately determine the signal quality of the cell through multiple parameters.

[0026] In a second aspect, the present application provides a terminal device, comprising: one or more processors; a memory; wherein one or more computer programs are stored in the memory, and the one or more computer programs include instructions, which, when executed by the terminal device, cause the terminal device to execute: obtaining the signal quality of each of a plurality of cells through signal measurement, wherein the plurality of cells include a service cell of the terminal device, and at least one cell other than the service cell, and the signal quality is a signal to interference plus noise ratio DMRS SINR of a demodulation reference signal of each of the plurality of cells; when the signal quality of the service cell is less than a first signal threshold, triggering the terminal device to switch to a target cell in at least one cell, the target cell being a cell in at least one cell whose signal quality is greater than a second signal threshold, and the second signal threshold is greater than the first signal threshold.

[0027] In some embodiments, the terminal device further performs: when the signal quality of the serving cell is less than a first signal threshold, the terminal device reports a first measurement report to the first base station, the first measurement report including the signal quality of the serving cell and at least one cell; receives a first switching command issued by the first base station according to the first measurement report, the first switching command including a radio resource control RRC reconfiguration message, the RRC reconfiguration message including an identifier of the target cell; and switches to the target cell according to the RRC reconfiguration message.

[0028] In some embodiments, the serving cell and the target cell belong to the same first base station.

[0029] In some embodiments, the serving cell belongs to the first base station, the target cell belongs to the second base station, and the RRC reconfiguration message carries a switching instruction sent by the second base station to the first base station after receiving the resource allocation request sent by the first base station.

[0030] In some embodiments, the service cell and the target cell belong to cells under different network standards, and the terminal device is also used to execute: when the signal quality of the service cell is less than the first signal threshold, sending a second measurement report to the third base station, so that the third base station sends a switching request to the first core network according to the measurement result of the second measurement report, and the first core network sends the switching request to the fourth base station through the second core network, and the fourth base station sends a second switching command to the third base station through the second core network and the first core network, the switching request includes the identifier of the target cell, and the second switching command is used to instruct the terminal device to switch to the target cell; receiving the second switching command sent by the third base station, the second switching command includes an RRC reconfiguration message; after switching to the target cell according to the RRC reconfiguration message, sending an RRC reconfiguration completion message to the fourth base station.

[0031] In some embodiments, the terminal device is further configured to execute: if it is determined that the DMRS SINR of the serving cell satisfies the corresponding parameter value interval, then determining that the signal quality of the serving cell is less than a first signal threshold.

[0032] In some embodiments, the signal quality further includes at least one of a reference signal received power RSRP, a reference signal received quality RSRQ, or a signal to interference plus noise ratio SSB SINR of a synchronization broadcast block.

[0033] In a third aspect, the present application provides a computer-readable storage medium, in which instructions are stored. When the instructions are executed on a terminal device, the terminal device executes the cell switching method as described in any one of the first aspects.

[0034] In a fourth aspect, the present application provides a computer program product, which includes computer instructions. When the computer instructions are executed on a terminal device, the terminal device executes the cell switching method as described in any one of the first aspects.

[0035] It can be understood that the terminal device described in the second aspect, the computer storage medium described in the third aspect, and the computer program product described in the fourth aspect are all used to execute the corresponding methods provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding methods provided above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A flow chart of a terminal device accessing a voice call as a called party;

[0037] Figure 2 An example diagram of an application scenario of the cell switching method provided in an embodiment of the present application;

[0038] Figure 3A schematic diagram of the structure of a mobile phone provided in an embodiment of the present application;

[0039] Figure 4 A software structure diagram of a mobile phone provided in an embodiment of the present application;

[0040] Figure 5 An example of the signal strength displayed after a mobile phone is connected to a 5G network is shown;

[0041] Figure 6 Interaction of the cell switching method provided in the embodiment of the present application Figure 1 ;

[0042] Figure 7 Interaction of the cell switching method provided in the embodiment of the present application Figure 2 ;

[0043] Figure 8 Cell switching example provided for the embodiment of the present application Figure 1 ;

[0044] Fig. 9 Cell switching example provided for the embodiment of the present application Figure 2 ;

[0045] Fig.10 Cell switching example provided for the embodiment of the present application Figure 3 ;

[0046] Fig.11 Interaction of the cell switching method provided in the embodiment of the present application Figure 3 ;

[0047] Fig.12 Interaction of the cell switching method provided in the embodiment of the present application Figure 4 ;

[0048] Fig.13 A schematic diagram of the structure of a terminal device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0049] The technical solution in the embodiment of the present application will be described below in conjunction with the drawings in the embodiment of the present application. In the description of the embodiment of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0050] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise specified, "plurality" means two or more.

[0051] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0052] Before describing the embodiments of the present application, the terms involved in the present application are first explained.

[0053] Reference signal receiving power (RSRP) is a key parameter that can represent the strength of wireless signals in long term evolution (LTE) networks and one of the physical layer measurement requirements. It is the average value of the signal power received on all resource elements carrying the reference signal within a symbol.

[0054] Reference signal receiving quality (RSRQ) refers to the LTE reference signal reception quality. This metric is mainly used to rank different LTE candidate cells based on signal quality.

[0055] Signal to interference plus noise ratio (SINR) refers to the ratio of the strength of the received useful signal to the strength of the received interference signal (noise and interference).

[0056] The tracking reference signal (TRS) is used to track and compensate for errors caused by oscillator defects so that the terminal device can correctly receive downlink data. TRS refers to the SINR at the cell level, which represents the signal to interference plus noise ratio of the entire cell.

[0057] The synchronization signal / PBCH (SSB) is one of the most important pilot channels used in 5G. Its function is related to many aspects of terminal equipment accessing the cell, such as cell search, beam measurement, beam selection or beam recovery.

[0058] The demodulation reference signal (DMRS) is used for the correlation demodulation of the physical uplink shared channel and the physical uplink control channel in LTE.

[0059] At present, when a terminal device is connected to a network, if the signal quality of the network currently connected to the terminal device is relatively poor, the terminal device may not be able to connect to a call or make a voice call. Alternatively, when a terminal device is making a voice call, if the signal quality of the network currently connected to the terminal device is relatively poor, the terminal device may experience a dropped call or poor call quality.

[0060] It should be explained that the network to which the terminal device is currently connected can be a 5G network or a 4G network, which is not limited in the embodiments of the present application.

[0061] Here, the call between the terminal devices may be a common voice call, an Internet voice call, etc. Among them, the common voice call may be a telephone number dial-up call between the terminal devices; the Internet voice call may be an instant messaging voice call or other Internet voice calls, such as a voice call between dating software, etc. In addition, the voice call may also be a voice call included in a video call.

[0062] The following takes the mobile phone as an example. Figure 1 The following is an example of a process in which a terminal device makes a voice call as the called party. Figure 1As shown, after the mobile phone receives the paging request sent by the 5G base station, the mobile phone parses the received paging request. After the mobile phone successfully parses the paging request, the mobile phone enters the call access process. Exemplarily, the 5G base station can send a paging message (i.e., paging message) through the communication port to page the mobile phone. After the mobile phone in the idle state successfully parses the paging message, the mobile phone enters the call access process. After the called party accesses the mobile phone, the 5G base station sends a paging request to the mobile phone, wherein the paging request carries the caller's phone number. After the mobile phone successfully receives the paging request sent by the 5G base station, the mobile phone sends a successful reception paging request identifier to the 5G instruction. For example, the mobile phone sends IMS_SIP_INVITE / TRYING to the 5G base station, indicating that the mobile phone has successfully received the paging request sent by the 5G base station. Then, the mobile phone sends IMS_SIP_INVITE / SESSION_PROGRESS to the 5G base station for resource reservation. The 5G base station sends IMS_SIP_PRACK / INFORMAL_RESPONSE to the mobile phone for resource reservation. The mobile phone sends a successful resource reservation mark to the 5G base station. For example, the mobile phone can send IMS_SIP_PRACK / OK to the 5G base station to indicate that the resource reservation is OK. The 5G base station sends an instruction to update the port number to the mobile phone. After receiving the instruction to update the port number, the mobile phone updates the port number. For example, the 5G base station sends IMS_SIP_UPDATE / INFORMAL_RESPONSE to the mobile phone to update the port number and sendrcv status. The mobile phone sends IMS_SIP_UPDATE / OK to the 5G base station, indicating that the mobile phone has successfully updated the port number and sendrcv status.

[0063] Furthermore, the mobile phone sends a ringing success instruction to the 5G base station. For example, the mobile phone sends IMS_SIP_INVITE / RINGING to the 5G base station to indicate that the mobile phone is ringing. When the mobile phone detects that the user clicks the answer button and performs the answer operation, the mobile phone sends a successful answer instruction to the 5G base station. For example, the mobile phone sends IMS_SIP_INVITE / OK to the 5G base station, indicating that the mobile phone successfully answers. When the calling mobile phone receives the successful answer instruction from the called mobile phone, the 5G base station sends the instruction ackIMS_SIP_ACK / INFORMAL_RESPONSE to the called mobile phone. When the mobile phone detects that the call is over, the mobile phone sends a call end instruction to the 5G base station. After receiving the call end instruction, the 5G base station sends a call end success instruction to the mobile phone. For example, the call end instruction can be IMS_SIP_BYE / INFORMAL_RESPONSE. The call end success instruction can be IMS_SIP_BYE / OK.

[0064] Before the mobile phone successfully answers the voice call, if the signal of the 5G network to which the mobile phone is connected is poor and downlink errors occur, making it impossible for the mobile phone to correctly receive the instructions sent by the 5G network, the mobile phone will not be able to connect to the call. Figure 1 After the mobile phone receives the paging message, the signal of the 5G network to which the mobile phone is connected is poor, resulting in the failure of the mobile phone to parse the paging message, which will cause the mobile phone to be unable to be called. For example, after the mobile phone receives the instruction to update the port number, the mobile phone fails to update the port number, which will also cause the mobile phone to be unable to be called.

[0065] In order to improve the above problem, an embodiment of the present application provides a cell switching method, which is applied to a terminal device. After the terminal device obtains the signal quality of each of the multiple cells through signal measurement, the method triggers the terminal device to switch to a target cell with a signal quality greater than a second signal threshold when the terminal device determines that the signal quality of the serving cell is less than a first signal threshold. The signal quality is the DMRS SINR of each of the multiple cells.

[0066] Therefore, when the signal quality of the service cell of the terminal device is poor, the terminal device can be triggered to switch to a cell with better quality in a timely manner, thereby reducing the frequency of unreachable calls or dropped calls on the terminal device and improving the success rate and call quality of the terminal device's voice call connection.

[0067] In the related art, chip manufacturers do not provide an interface for terminal devices to actively obtain DMRS SINR, nor do they actively report DMRS SINR to terminal devices, resulting in the terminal device being unable to judge the signal quality of the cell by DMRS SINR. In the embodiment of the present application, the terminal device determines the signal quality of multiple cells by measuring DMRS SINR, which can more accurately reflect the signal quality of the cell.

[0068] Exemplarily, the cell switching method provided in the embodiments of the present application can be applied to terminal devices such as mobile phones, tablet computers, personal computers (PCs), personal digital assistants (PDAs), smart watches, netbooks, augmented reality (AR) devices, virtual reality (VR) devices, vehicle-mounted devices, smart cars, etc., and the embodiments of the present application do not impose any restrictions on this.

[0069] Figure 2 An example diagram of an application scenario of the cell switching method provided in the embodiment of the present application is shown in FIG. Figure 2As shown, the application scenario includes: a 5G core network, multiple 5G base stations 210 (the next Generation NodeB, gNB), a 4G core network and multiple 4G base stations 220 (enhanced NodeB, eNB). Figure 2 In the example, the terminal device is a mobile phone 230. The mobile phone 230 is connected to the gNB 210 and communicates through the 5G core network. The signal coverage range of the gNB 210 is the cell of the gNB 210. Similarly, the signal coverage range of the eNB 220 is the cell of the eNB 220.

[0070] Among them, 5G base stations are the core equipment of 5G networks, providing wireless coverage and realizing wireless signal transmission between wired communication networks and terminal devices.

[0071] In the embodiment of the present application, after the mobile phone 230 accesses the 5G core network through the gNB, when the mobile phone 230 detects that the signal quality of the serving cell is poor, it can switch to other cells. After the mobile phone 230 connects to other cells, the mobile phone 230 determines that the signal quality of the switched cell is still poor, and the mobile phone 230 can connect to the 4G core network.

[0072] It should be explained that the service cell of mobile phone 230 and the cell connected after switching can be cells under the same 5G base station or cells under different 5G base stations, which is not limited here.

[0073] In an embodiment of the present application, after mobile phone 230 accesses the 5G core network through gNB, when mobile phone 230 detects that the signal quality of the service cell is poor, if mobile phone 230 determines that the signal quality of other cells under the 5G network standard that can be searched is worse than the signal quality of the service cell, then mobile phone 230 can directly switch to the cell under the 4G network standard.

[0074] also, Figure 2 The cell switching method in the embodiment is only used as an exemplary scenario, and the cell switching method provided in this application is not limited to this scenario.

[0075] like Figure 3 As shown, Figure 3 A schematic diagram of the structure of a mobile phone provided in an embodiment of the present application.

[0076] The mobile phone 300 may include a processor 110, an external memory interface 120, an internal memory 121, a universal serial bus (USB) interface 130, a charging management module 140, a power management module 141, a battery 142, an antenna 1, an antenna 2, a mobile communication module 150, a wireless communication module 160, an audio module 170, a speaker 170A, a receiver 170B, a microphone 170C, an earphone interface 170D, a sensor module 180, a button 190, a motor 191, an indicator 192, a camera 193, a display screen 194, and a subscriber identification module (SIM) card interface 195, etc. The sensor module 180 may include a pressure sensor 180A, a gyroscope sensor 180B, an air pressure sensor 180C, a magnetic sensor 180D, an acceleration sensor 180E, a distance sensor 180F, a proximity light sensor 180G, a fingerprint sensor 180H, a temperature sensor 180J, a touch sensor 180K, an ambient light sensor 180L, a bone conduction sensor 180M, etc.

[0077] It is to be understood that the structure illustrated in the embodiment of the present application does not constitute a specific limitation on the mobile phone 300. In other embodiments of the present application, the mobile phone 300 may include more or fewer components than shown in the figure, or combine some components, or split some components, or arrange the components differently. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

[0078] The processor 110 may include one or more processing units, for example, the processor 110 may include an application processor (AP), a modem processor, a graphics processor (GPU), an image signal processor (ISP), a controller, a memory, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural-network processing unit (NPU), etc. Different processing units may be independent devices or integrated into one or more processors.

[0079] The controller may be the nerve center and command center of the mobile phone 300. The controller may generate an operation control signal according to the instruction operation code and the timing signal to complete the control of fetching and executing instructions.

[0080] The processor 110 may also be provided with a memory for storing instructions and data. In some embodiments, the memory in the processor 110 is a cache memory. The memory may store instructions or data that the processor 110 has just used or cyclically used. If the processor 110 needs to use the instruction or data again, it may be directly called from the memory. This avoids repeated access, reduces the waiting time of the processor 110, and thus improves the efficiency of the system.

[0081] In some embodiments, the processor 110 may include one or more interfaces. The interface may include an inter-integrated circuit (I2C) interface, an inter-integrated circuit sound (I2S) interface, a pulse code modulation (PCM) interface, a universal asynchronous receiver / transmitter (UART) interface, a mobile industry processor interface (MIPI), a general-purpose input / output (GPIO) interface, a subscriber identity module (SIM) interface, and / or a universal serial bus (USB) interface, etc.

[0082] The I2C interface is a bidirectional synchronous serial bus, including a serial data line (SDA) and a serial clock line (SCL).

[0083] The I2S interface can be used for audio communication.

[0084] The PCM interface can also be used for audio communication to sample, quantize and encode analog signals.

[0085] The UART interface is a universal serial data bus used for asynchronous communication. The bus can be a bidirectional communication bus. It converts the data to be transmitted between serial communication and parallel communication.

[0086] The MIPI interface can be used to connect the processor 110 with peripheral devices such as the display screen 194 and the camera 193. The MIPI interface includes a camera serial interface (CSI), a display serial interface (DSI), and the like.

[0087] The GPIO interface can be configured by software. The GPIO interface can be configured as a control signal or a data signal.

[0088] The USB interface 130 is an interface that complies with the USB standard specification, and specifically can be a Mini USB interface, a Micro USB interface, a USB Type C interface, etc. The USB interface 130 can be used to connect a charger to charge the mobile phone 300, and can also be used to transfer data between the mobile phone 300 and peripheral devices. It can also be used to connect headphones to play audio through the headphones. The interface can also be used to connect other terminal devices, such as AR devices, etc.

[0089] It is understandable that the interface connection relationship between the modules illustrated in the embodiment of the present application is only a schematic illustration and does not constitute a structural limitation on the mobile phone 300. In other embodiments of the present application, the mobile phone 300 may also adopt different interface connection methods in the above embodiments, or a combination of multiple interface connection methods.

[0090] The charging management module 140 is used to receive charging input from a charger, where the charger can be a wireless charger or a wired charger.

[0091] The power management module 141 is used to connect the battery 142, the charging management module 140 and the processor 110. The power management module 141 receives input from the battery 142 and / or the charging management module 140, and supplies power to the processor 110, the internal memory 121, the external memory, the display screen 194, the camera 193, and the wireless communication module 160. The power management module 141 can also be used to monitor parameters such as battery capacity, battery cycle number, battery health status (leakage, impedance), etc.

[0092] The wireless communication function of the mobile phone 300 can be realized through the antenna 1, the antenna 2, the mobile communication module 150, the wireless communication module 160, the modem processor and the baseband processor.

[0093] Antenna 1 and antenna 2 are used to transmit and receive electromagnetic wave signals. Each antenna in mobile phone 300 can be used to cover a single or multiple communication frequency bands. Different antennas can also be reused to improve the utilization of antennas. For example, antenna 1 can be reused as a diversity antenna for a wireless local area network. In some other embodiments, the antenna can be used in combination with a tuning switch.

[0094] The mobile communication module 150 can provide solutions for wireless communications including 2G / 3G / 4G / 5G, etc., applied to the mobile phone 300. The mobile communication module 150 may include at least one filter, a switch, a power amplifier, a low noise amplifier (LNA), etc. The mobile communication module 150 can receive electromagnetic waves from the antenna 1, and filter, amplify, and process the received electromagnetic waves, and transmit them to the modulation and demodulation processor for demodulation. The mobile communication module 150 can also amplify the signal modulated by the modulation and demodulation processor, and convert it into electromagnetic waves for radiation through the antenna 1. In some embodiments, at least some of the functional modules of the mobile communication module 150 can be set in the processor 110. In some embodiments, at least some of the functional modules of the mobile communication module 150 can be set in the same device as at least some of the modules of the processor 110.

[0095] The modem processor may include a modulator and a demodulator. Among them, the modulator is used to modulate the low-frequency baseband signal to be sent into a medium-high frequency signal. The demodulator is used to demodulate the received electromagnetic wave signal into a low-frequency baseband signal. The demodulator then transmits the demodulated low-frequency baseband signal to the baseband processor for processing. After the low-frequency baseband signal is processed by the baseband processor, it is passed to the application processor. The application processor outputs a sound signal through an audio device (not limited to a speaker 170A, a receiver 170B, etc.), or displays an image or video through a display screen 194. In some embodiments, the modem processor may be an independent device. In other embodiments, the modem processor may be independent of the processor 110 and be set in the same device as the mobile communication module 150 or other functional modules.

[0096] In an embodiment of the present application, the modem processor is also used to receive the signal quality sent by a cell of a 5G network within the coverage range of the mobile phone. The modem processor is also used to receive the signal quality sent by a cell of a 4G network within the coverage range of the mobile phone.

[0097] The wireless communication module 160 can provide wireless communication solutions including wireless local area networks (WLAN) (such as wireless fidelity (Wi-Fi) networks), bluetooth (BT), global navigation satellite system (GNSS), frequency modulation (FM), near field communication (NFC), infrared (IR), etc., which are applied to the mobile phone 300. The wireless communication module 160 can be one or more devices integrating at least one communication processing module. The wireless communication module 160 receives electromagnetic waves via the antenna 2, modulates the frequency of the electromagnetic wave signal and performs filtering, and sends the processed signal to the processor 110. The wireless communication module 160 can also receive the signal to be sent from the processor 110, modulate the frequency of it, amplify it, and convert it into electromagnetic waves for radiation through the antenna 2.

[0098] In some embodiments, the antenna 1 of the mobile phone 300 is coupled to the mobile communication module 150, and the antenna 2 is coupled to the wireless communication module 160, so that the mobile phone 300 can communicate with the network and other devices through wireless communication technology. The wireless communication technology may include global system for mobile communications (GSM), general packet radio service (GPRS), code division multiple access (CDMA), wideband code division multiple access (WCDMA), time-division code division multiple access (TD-SCDMA), long term evolution (LTE), BT, GNSS, WLAN, NFC, FM, and / or IR technology. GNSS may include the global positioning system (GPS), the global navigation satellite system (GLONASS), the Beidou navigation satellite system (BDS), the quasi-zenith satellite system (QZSS) and / or the satellite based augmentation system (SBAS).

[0099] The mobile phone 300 implements the display function through a GPU, a display screen 194, and an application processor. The GPU is a microprocessor for image processing, which connects the display screen 194 and the application processor. The GPU is used to perform mathematical and geometric calculations for graphics rendering. The processor 110 may include one or more GPUs that execute program instructions to generate or change display information.

[0100] The display screen 194 is used to display images, videos, etc. The display screen 194 includes a display panel. The display panel can be a liquid crystal display (LCD), an organic light-emitting diode (OLED), an active-matrix organic light-emitting diode or an active-matrix organic light-emitting diode (AMOLED), a flexible light-emitting diode (FLED), Miniled, MicroLed, Micro-oLed, a quantum dot light-emitting diode (QLED), etc. In some embodiments, the mobile phone 300 may include 1 or N display screens 194, where N is a positive integer greater than 1.

[0101] The mobile phone 300 can realize the shooting function through the ISP, the camera 193, the video codec, the GPU, the display screen 194 and the application processor.

[0102] ISP is used to process the data fed back by camera 193. For example, when taking a photo, the shutter is opened, and the light is transmitted to the camera photosensitive element through the lens. The light signal is converted into an electrical signal, and the camera photosensitive element transmits the electrical signal to ISP for processing and converts it into an image visible to the naked eye. ISP can also perform algorithm optimization on the noise, brightness, and skin color of the image. ISP can also optimize the exposure, color temperature and other parameters of the shooting scene. In some embodiments, ISP can be set in camera 193.

[0103] The camera 193 is used to capture still images or videos. The object generates an optical image through the lens and projects it onto the photosensitive element. The photosensitive element can be a charge coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) phototransistor. The photosensitive element converts the optical signal into an electrical signal, and then passes the electrical signal to the ISP to be converted into a digital image signal. The ISP outputs the digital image signal to the DSP for processing. The DSP converts the digital image signal into an image signal in a standard RGB, YUV or other format. In some embodiments, the mobile phone 300 may include 1 or N cameras 193, where N is a positive integer greater than 1.

[0104] The digital signal processor is used to process digital signals, and can process not only digital image signals but also other digital signals. For example, when the mobile phone 300 is selecting a frequency point, the digital signal processor is used to perform Fourier transform on the frequency point energy.

[0105] Video codecs are used to compress or decompress digital videos. Mobile phone 300 can support one or more video codecs. In this way, mobile phone 300 can play or record videos in multiple coding formats, such as moving picture experts group (MPEG) 1, MPEG2, MPEG3, MPEG4, etc.

[0106] NPU is a neural network (NN) computing processor. By drawing on the structure of biological neural networks, such as the transmission mode between neurons in the human brain, it can quickly process input information and can also continuously self-learn. Through NPU, the intelligent cognition of the mobile phone 300 can be realized, such as: image recognition, face recognition, voice recognition, text understanding, etc.

[0107] The external memory interface 120 can be used to connect an external memory card, such as a Micro SD card, to expand the storage capacity of the mobile phone 300. The external memory card communicates with the processor 110 through the external memory interface 120 to implement a data storage function. For example, files such as music and videos can be stored in the external memory card.

[0108] The internal memory 121 can be used to store computer executable program codes, and the executable program codes include instructions. The processor 110 executes various functional applications and data processing of the mobile phone 300 by running the instructions stored in the internal memory 121. The internal memory 121 may include a program storage area and a data storage area. Among them, the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc. The data storage area can store data created during the use of the mobile phone 300 (such as audio data, a phone book, etc.), etc. In addition, the internal memory 121 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, a universal flash storage (UFS), etc.

[0109] The mobile phone 300 can implement audio functions such as music playing and recording through the audio module 170, the speaker 170A, the receiver 170B, the microphone 170C, the earphone interface 170D, and the application processor.

[0110] The key 190 includes a power key, a volume key, etc. The key 190 can be a mechanical key or a touch key. The mobile phone 300 can receive key input and generate key signal input related to the user settings and function control of the mobile phone 300.

[0111] Motor 191 can generate vibration prompts. Motor 191 can be used for incoming call vibration prompts, and can also be used for touch vibration feedback. For example, touch operations acting on different applications (such as taking pictures, audio playback, etc.) can correspond to different vibration feedback effects. For touch operations acting on different areas of the display screen 194, motor 191 can also correspond to different vibration feedback effects. Different application scenarios (for example: time reminders, receiving messages, alarm clocks, games, etc.) can also correspond to different vibration feedback effects. The touch vibration feedback effect can also support customization.

[0112] Indicator 192 may be an indicator light, which may be used to indicate charging status, power changes, messages, missed calls, notifications, etc.

[0113] The SIM card interface 195 is used to connect the SIM card. The SIM card can be connected to and separated from the mobile phone 300 by inserting it into the SIM card interface 195 or pulling it out from the SIM card interface 195. The mobile phone 300 can support 1 or N SIM card interfaces, where N is a positive integer greater than 1. The SIM card interface 195 can support Nano SIM cards, Micro SIM cards, SIM cards, etc. Multiple cards can be inserted into the same SIM card interface 195 at the same time. The types of multiple cards can be the same or different. The SIM card interface 195 can also be compatible with different types of SIM cards. The SIM card interface 195 can also be compatible with external memory cards. The mobile phone 300 interacts with the network through the SIM card to realize functions such as calls and data communications. In some embodiments, the mobile phone 300 uses an eSIM, i.e., an embedded SIM card. The eSIM card can be embedded in the mobile phone 300 and cannot be separated from the mobile phone 300.

[0114] The software system of the mobile phone 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 invention takes the Android system of the layered architecture as an example to illustrate the software structure of the mobile phone.

[0115] Figure 4 A software structure diagram of a mobile phone provided in an embodiment of the present application.

[0116] It is understandable that the layered architecture divides the software into several layers, each with clear roles and division of labor. The layers communicate with each other through software interfaces. In some embodiments, the Android system may include an application layer (abbreviated as application layer), an application framework layer (abbreviated as framework layer), a system library, and a kernel layer.

[0117] The above-mentioned application layer may include a series of application packages.

[0118] like Figure 4 As shown, the application package may include system applications. System applications refer to applications set in the mobile phone before leaving the factory. For example, system applications may include programs such as camera, gallery, calendar, music, short message, memo, and weather.

[0119] The application package may also include third-party applications, which are applications that users install after downloading the installation package from an application store (or application market), such as map applications, food delivery applications, reading applications (such as e-books), social applications, and travel applications.

[0120] The application framework layer provides an application programming interface (API) and a programming framework for the application programs in the application layer. The application framework layer includes some predefined functions.

[0121] like Figure 4 As shown, the application framework layer may include a window manager, a content provider, a view system, a phone manager, a resource manager, a notification manager, and a network control module, etc.

[0122] The window manager is used to manage window programs. The window manager can obtain the display screen size, determine whether there is a status bar, lock the screen, capture the screen, etc.

[0123] Content providers are used to store and retrieve data and make it accessible to applications. The data can include videos, images, audio, calls made and received, browsing history and bookmarks, phone books, etc.

[0124] The view system includes visual controls, such as controls for displaying text, controls for displaying images, etc. The view system can be used to build applications. A display interface can be composed of one or more views. For example, a display interface including a text notification icon can include a view for displaying text and a view for displaying images.

[0125] The phone manager is used to provide the communication functions of the mobile phone, such as the management of call status (including answering, hanging up, etc.).

[0126] The resource manager provides various resources for applications, such as localized strings, icons, images, layout files, video files, and so on.

[0127] The notification manager allows applications to display notification information in the status bar. It can be used to convey notification-type messages and can disappear automatically after a short stay without user interaction. For example, the notification manager is used to notify download completion, message reminders, etc. The notification manager can also be a notification that appears in the system top status bar in the form of a chart or scroll bar text, such as notifications of applications running in the background, or a notification that appears on the screen in the form of a dialog window. For example, a text message is displayed in the status bar, a reminder sound is emitted, the phone vibrates, the indicator light flashes, etc.

[0128] The network control module is used to receive the first signal quality of the first cell and the second signal quality of the second cell sent by the modem when the mobile phone is connected to the first cell, and determine whether to continue using the network of the first cell for uplink / downlink communication based on the first signal quality.

[0129] In one possible case, the network control module determines that the signal quality of the first cell is greater than a first signal threshold, and the network control module determines that the mobile phone continues to use the network of the first cell for uplink / downlink communications.

[0130] In another possible case, the network control module determines that the signal quality of the first cell is less than the first signal threshold. The network control module can determine a cell with higher signal quality than the first cell from the second cell according to the second signal quality of the second cell, namely, target cell 1.

[0131] After the network control module determines that the mobile phone is connected to the 5G network of the target cell 1, the network control module can obtain the first signal quality of the target cell 1 and the second signal quality of the third cell. When the network control module determines that the signal quality of the target cell 1 is less than the first signal threshold, and there is no cell in the third cell with a signal quality higher than the signal quality of the target cell 1, the network control module determines to switch the network connected to the mobile phone from the 5G network to the 4G network.

[0132] After the mobile phone accesses the 4G network, the network control module can also determine whether to switch cells or disconnect from the 4G network and access the 2G network based on the signal quality of the cell of the currently connected 4G network.

[0133] Android Runtime includes core libraries and virtual machines. Android Runtime is responsible for scheduling and management of the Android system.

[0134] The core library consists of two parts: one part is the function that needs to be called by the Java language, and the other part is the Android core library.

[0135] The application layer and the application framework layer run in a virtual machine. The virtual machine executes the Java files of the application layer and the application framework layer as binary files. The virtual machine is used to perform functions such as object life cycle management, stack management, thread management, security and exception management, and garbage collection.

[0136] The system library may include multiple functional modules, such as surface manager, media library, 3D graphics processing library (such as OpenGL ES), 2D graphics engine (such as SGL), etc.

[0137] The surface manager is used to manage the display subsystem and provide the fusion of two-dimensional and three-dimensional layers for multiple applications.

[0138] The media library supports playback and recording of a variety of commonly used audio and video formats, as well as static image files, etc. The media library can support a variety of audio and video encoding formats, such as: MPEG4, H.264, MP3, AAC, AMR, JPG, PNG, etc.

[0139] The 3D graphics processing library is used to implement 3D graphics drawing, image rendering, compositing, and layer processing.

[0140] A 2D graphics engine is a drawing engine for 2D drawings.

[0141] The kernel layer is the layer between hardware and software. The kernel layer includes at least display driver, camera driver, audio driver and sensor driver.

[0142] The technical solutions involved in the following embodiments can all be implemented in a terminal device having the above hardware structure and software architecture. The following still takes the terminal device as a mobile phone as an example to illustrate this solution.

[0143] In the embodiment of the present application, after the mobile phone is turned on, the mobile phone performs system initialization settings. For example, the mobile phone reads the information stored in its own subscriber identity module (SIM) to determine whether the SIM card stores prior information. The prior information is used to select a public land mobile network (PLMN). For example, the prior information may be a carrier frequency, a cell parameter, etc.

[0144] In one possible case, when the mobile phone determines that no prior information is stored in the SIM card, the mobile phone performs a full-band search, searches for the cell with the strongest signal on each frequency point and reports it to the non-access stratum (NAS) of the mobile phone. The NAS determines whether to continue searching for the PLMN.

[0145] In another possible case, when the mobile phone determines that the SIM card stores the prior information, the NAS layer instructs the access stratum (AS) to perform a PLMN search according to the parameters of the prior information and reports the search result to the NAS layer.

[0146] After the mobile phone selects the PLMN, it selects the cell with the best signal quality from the PLMN for initial access. The initial access process includes cell search, system information transmission and random access.

[0147] Among them, cell means that 5G base stations use different electromagnetic waves to cover different areas, that is, one 5G base station can cover multiple cells.

[0148] The above-mentioned cell search is the process by which the mobile phone obtains frequency and time synchronization in the downlink direction of the cell and then detects the cell identification number. The mobile phone first searches for the primary synchronization signal (PSS) and the secondary synchronization signal (SSS), obtains downlink clock synchronization, and obtains the physical cell identity (PCI) of the cell. Then, the mobile phone can read the master information block (MIB) and obtain other system information broadcast by the network through the information carried on the MIB (for example, SSS beam information, system frame number or remaining minimum system information (RMSI, also known as SIB1), etc.).

[0149] After the mobile phone completes the cell search process, the mobile phone and the cell achieve downlink synchronization and obtain the system information required to initiate random access. Then, the mobile phone achieves uplink synchronization with the network side through the random access process. After the mobile phone completes the random access process, the mobile phone can perform uplink / downlink data transmission.

[0150] For example, Figure 5 The following figure shows an example of the signal strength displayed after the mobile phone is connected to the 5G network. After the mobile phone accesses a cell of a 5G base station, an icon indicating the signal strength of the service cell can be displayed on the display screen of the mobile phone. For example, Figure 5The 501 area in (a) shows an example of a full signal. Figure 5 Region 502 in (b) shows an example diagram where the signal is not full.

[0151] It should be explained that when a mobile phone searches for multiple cells, the multiple cells may belong to the same 5G base station or to different 5G base stations. Whether the cells belong to the same base station depends on the actual scenario, and this is not limited in the embodiments of this application. For example, assuming that the mobile phone can search for 5 cells at the same time, cells 1 to 3 may belong to the same 5G base station, and cells 4 and 5 may belong to the same 5G base station. In addition, the multiple cells searched by the mobile phone may also include cells under 4G base stations, which is not limited here.

[0152] After searching for multiple cells, the mobile phone can determine the signal quality of each cell through signal measurement, and determine the cell with the best signal quality from multiple cells according to the signal quality of each cell. Then, the mobile phone accesses the cell with the best signal quality to perform uplink / downlink data transmission. Among them, the signal quality can include at least one of RSRP, RSRQ or SSB SINR.

[0153] For example, suppose the mobile phone can search for three cells, the PICs of the three cells are 01, 02 and 03 respectively, and the mobile phone obtains the RSRP values ​​of the three cells, that is, the RSRP value of cell 01 is -80dBm, the RSRP value of cell 02 is -100dBm, and the RSRP value of cell 03 is -90dBm. Based on the RSRP values ​​of the three cells, the mobile phone determines that the cell with the best signal quality is cell 01.

[0154] It should be explained that the PIC of the cell shown in the above example is only an exemplary description, and the mobile phone determines the signal quality of the cell according to the RSRP value corresponding to each cell is also only an exemplary description. The mobile phone can also determine the signal quality of the cell according to RSRP and RSRQ, or the mobile phone can also determine the signal quality of the cell according to RSRP, RSRQ and SSB SINR, and so on.

[0155] In one possible scenario of the present application, after the mobile phone accesses a service cell (such as cell a) covering a 5G network, the mobile phone can determine the signal quality of cell a in real time or periodically, as well as the signal quality of at least one cell other than the service cell that the mobile phone can search for. When the mobile phone determines that the signal quality of cell a is less than the first signal threshold, the mobile phone can determine a cell (such as cell b) having a signal quality greater than cell a from at least one cell of the mobile phone based on the signal quality of at least one cell. Then, the mobile phone can switch the connected cell, that is, switch from cell a to cell b. After the mobile phone is connected to cell b, the mobile phone continues to determine the signal quality of cell b in real time or periodically to determine whether to continue to trigger cell switching.

[0156] When the mobile phone is connecting to cell b, if the mobile phone determines that the signal quality of cell b is less than the first signal threshold, and the signal quality of other cells under the 5G base station that the mobile phone can search is less than the signal quality of cell b, the mobile phone can switch to the cell with better signal quality under the 4G base station.

[0157] In another possible scenario of the present application, when the mobile phone determines that the signal quality of the serving cell is less than the first signal threshold, the mobile phone determines that the signal quality of other cells under the 5G base station that can be searched is lower than the signal quality of the serving cell. In this case, the network connected to the mobile phone can be directly switched from the serving cell to the cell with better signal quality under the 4G base station.

[0158] The following is combined with Figure 6 To Attachment Fig.10 The above process is explained in detail. Figure 6 As shown, the cell switching method may include the following steps:

[0159] Step 601: After the mobile phone is connected to the first cell, the mobile phone obtains the first signal quality of the first cell and the second signal quality of the second cell.

[0160] For the convenience of describing this solution, in the embodiment of this application, the cell under the 5G network currently accessed by the mobile phone is referred to as the first cell. The first cell is also the serving cell. At least one cell other than the first cell that can be searched by the mobile phone is referred to as the second cell.

[0161] In the embodiment of the present application, the second cell may be one or more, and the number of the second cells is subject to the number of cells actually searched by the mobile phone, which is not limited here. When there are multiple second cells, the above-mentioned acquisition of the second signal quality of the second cell is actually to obtain the signal quality of each cell corresponding to the multiple cells. In the embodiment of the present application, multiple second cells are used for exemplary explanation. In addition, the network of the second cell can be a 5G network or a 4G network, which is not limited in the embodiment of the present application.

[0162] The first signal quality is used to measure the signal quality of the first cell, and the second signal quality is used to measure the signal quality of at least one cell except the first cell.

[0163] In the embodiment of the present application, the first signal quality is different from the second signal quality, wherein the first signal quality includes the DMRS SINR, and the second signal quality does not include the DMRS SINR.

[0164] In an embodiment of the present application, the first signal quality is the DMRS SINR of the first cell, or the first signal quality may also be at least one of RSRP, RSRQ or SSB SINR and DMRS SINR, and the second signal quality may be at least one of RSRP, RSRQ or SSB SINR. For example, the first signal quality may be DMRS SINR, RSRP and RSRQ. The second signal quality parameter may be RSRP and RSRQ. For another example, the first signal quality may be DMRS SNR, RSRP, RSRQ and SSB SINR. The second signal quality may be RSRP, RSRQ and SSB SINR.

[0165] In the embodiment of the present application, after the mobile phone successfully connects to the first cell, the mobile phone can simultaneously obtain the first signal quality of the first cell and the second signal quality of the second cell. Alternatively, after the mobile phone obtains the first signal quality of the first cell in real time, when the mobile phone determines that the signal quality of the first cell is less than the first signal threshold based on the first signal quality, the mobile phone can obtain the second signal quality of the second cell.

[0166] As a possible implementation manner, after the mobile phone successfully accesses the first cell, the mobile phone can obtain the first signal quality of the first cell and the second signal quality of the second cell in real time.

[0167] It can be understood that when the mobile phone determines that the signal quality of the first cell currently connected is less than the first signal threshold, the mobile phone can determine the target cell 1 whose signal quality is greater than the second signal threshold from the second cell according to the second signal quality of the second cell. Then, the mobile phone disconnects from the first cell and switches to the target cell 1 to avoid the phenomenon that the signal quality of the first cell currently connected by the mobile phone is poor and the call cannot be connected.

[0168] For example, Figure 7As shown, after the mobile phone successfully accesses the first cell, the modem in the mobile phone can obtain the first signal quality of the first cell and the second signal quality of the second cell in real time. After the modem obtains the first signal quality of the first cell and the second signal quality of the second cell, the modem sends the first signal quality and the second signal quality to the network control module, so that the network control module determines whether to perform cell switching according to the first signal quality and the second signal quality.

[0169] As another possible implementation, after the mobile phone successfully accesses the first cell, the mobile phone can obtain the first signal quality of the first cell in real time. When the mobile phone determines that the signal quality of the first cell is less than the first signal threshold based on the first signal quality, the mobile phone can obtain the second signal quality of the second cell.

[0170] It can be understood that when the mobile phone determines that the signal quality of the first cell currently connected is less than the first signal threshold, the mobile phone can obtain the second signal quality of the second cell within the signal range, and determine the target cell 1 with higher signal quality than the first cell from the second cell according to the second signal quality of the second cell. Then, the mobile phone can disconnect from the first cell and switch to the target cell 1 to avoid the phenomenon that the call cannot be connected due to the poor signal quality of the mobile phone.

[0171] For example, Figure 7 As shown, after the mobile phone successfully accesses the first cell, the modem in the mobile phone can obtain the first signal quality of the first cell in real time. After the modem obtains the first signal quality of the first cell, the modem sends the first signal quality to the network control module, so that the network control module determines the signal quality of the first cell according to the first signal quality.

[0172] Each parameter in the first signal quality and the second signal quality obtained by the mobile phone may be a specific parameter value or a parameter range, which is not limited here.

[0173] For example, assuming that the first signal quality is DMRS SNR and RSRP, the first signal quality obtained by the mobile phone may include DMRS SNR of -8 and RSRP of -105. Alternatively, the first signal quality obtained by the mobile phone may include DMRS SNR of (-10, -5) and RSRP of (-110, -100).

[0174] For another example, assuming that the second signal quality is RSRP and RSRQ, the second signal quality obtained by the mobile phone may include RSRP of -105 and RSRQ of -11. Alternatively, the second signal quality obtained by the mobile phone may include RSRP of (-110, -100) and RSRQ of (-15, -10).

[0175] It should be explained that the parameters and corresponding parameter values ​​included in the first signal quality and the second signal quality in the above example are only described as examples. In the embodiment of the present application, the parameters and corresponding parameter values ​​included in the first signal quality and the second signal quality obtained by the mobile phone are determined according to the parameter values ​​obtained in the actual scenario and are not limited here.

[0176] Step 602: The mobile phone determines whether the signal quality of the first cell is less than a first signal threshold according to the first signal quality.

[0177] In the embodiment of the present application, after the mobile phone obtains the first signal quality of the first cell, the mobile phone determines whether the signal quality of the first cell is less than the first signal threshold according to the first signal quality.

[0178] For example, Figure 7 As shown, after the network control module receives the first signal quality sent by the modem, the network control module determines whether the signal quality of the first cell is less than the first signal threshold according to the first signal quality.

[0179] Since the first signal quality can be at least one of RSRP, RSRQ or SSB SINR and DMRS SINR, the network control module can determine whether the signal quality of the first cell is less than the first signal threshold based on at least one parameter of RSRP, RSRQ or SSB SINR and DMRS SINR.

[0180] Exemplarily, as shown in the following Table 1, Table 1 shows the parameter value range corresponding to each parameter when the signal quality is less than the first signal threshold.

[0181] Table 1

[0182] DMRS SNR RSRP RQ SSB SNR Less than D1 * * * [D1, D2) Less than R1 Less than Q1 * [D2, D3) Less than R2 Less than Q2 Less than S1 [D3, D4) Less than R3 Less than Q3 Less than S2 [D4, D5) Less than R4 Less than Q4 Smaller than S3 [D5, D6] Less than R4 Less than Q4 Smaller than S4 Greater than D6 Less than R4 Less than Q4 Smaller than S5

[0183] It should be noted that the size relationship of D1 to D6 in Table 1 above is: D1 < D2 < D3 < D4 < D5 < D6, the size relationship of R1 to R4 is R1 > R2 > R3 > R4, the size relationship of Q1 to Q3 is: Q1 > Q2 > Q3 > Q4, and the size relationship of S1 to S5 is: S1 < S2 < S3 < S4 < S5. In the embodiments of the present application, the values of DMRS SINR, RSRP, RSRQ, and SSB SINR in Table 1 above are not limited. For example, D1 can be -10, D2 can be -5, D3 can be 0, D4 can be 5, D5 can be 10, D6 can be 15, R1 can be -100, R2 can be -110, R3 can be -115, R4 can be -120, Q1 can be -10, Q2 can be -12, Q3 can be -15, S1 can be -5, S2 can be 0, S3 can be 5, S4 can be 10, and S5 can be 15.

[0184] In addition, the division of the parameter values of DMRS SINR into 7 parameter value intervals in Table 1 above is only an exemplary description. In actual scenarios, the parameter values of DMRS SINR can be divided into different parameter value intervals. In the embodiments of the present application, the number of parameter value intervals of DMRS SINR and the parameter values of DMRS SINR corresponding to each parameter value interval are not limited. For example, the parameter values of DMRS SINR can be divided into 6 grades, or the parameter values of DMRS SINR can be divided into 5 grades, and so on.

[0185] According to the parameters shown in Table 1, the network control module determines whether each parameter value in the first signal quality meets the preset condition 1, including but not limited to the following situations.

[0186] In the first case, assuming that the first signal quality only includes DMRS SINR, as shown in Table 1 above, when the network control module determines that DMRS SINR is less than D1, the network control module determines that the signal quality of the first cell is less than the first signal threshold. When the network control module determines that DMRS SINR is greater than D1, the network control module determines that the signal quality of the first cell is greater than the first signal threshold.

[0187] It can be understood that the size of the value of DMRS SINR can reflect the signal quality of the first cell currently accessed by the mobile phone. The larger the value of DMRS SINR, the better the signal quality of the first cell accessed by the mobile phone, and the smaller the value of DMRS SINR, the worse the signal quality of the first cell accessed by the mobile phone.

[0188] In the second case, assuming that the first signal quality includes DMRS SINR and RSRP, as shown in Table 1 above, when the network control module determines that the DMRS SINR is less than D1, the network control module determines that the signal quality of the first cell is less than the first signal threshold. Alternatively, when the network control module determines that the DMRS SINR is greater than D1 and less than D2, and the RSRP is less than R1, the network control module determines that the signal quality of the first cell is less than the first signal threshold. Alternatively, when the network control module determines that the DMRS SINR is greater than D2 and less than D3, and the RSRP is less than R2, the network control module determines that the signal quality of the first cell is less than the first signal threshold. Alternatively, when the network control module determines that the DMRS SINR is greater than D3 and less than D4, and the RSRP is less than R3, the network control module determines that the signal quality of the first cell is less than the first signal threshold. Alternatively, when the network control module determines that the DMRS SINR is greater than D4 and the RSRP is less than R4, the network control module determines that the signal quality of the first cell is less than the first signal threshold.

[0189] It can be understood that, when the first signal quality acquired by the network control module includes DMRS SINR and RSRP, if the value of DMRS SINR is small, the value of DMRS SINR can directly reflect that the signal quality of the first cell is poor, and the network control module can determine that the signal quality of the first cell is less than the first signal threshold value according to the value of DMRS SINR. If the value of DMRS SINR cannot accurately determine the signal quality of the first cell, it can continue to determine whether the signal quality of the first cell is less than the first signal threshold value according to the value of RSRP.

[0190] In the third case, assuming that the first signal quality includes DMRS SINR and RSRQ, as shown in Table 1 above, when the network control module determines that the DMRS SINR is less than D1, the network control module determines that the signal quality of the first cell is less than the first signal threshold. Alternatively, when the network control module determines that the DMRS SINR is greater than D1 and less than D2, and the RSRQ is less than Q1, the network control module determines that the signal quality of the first cell is less than the first signal threshold. Alternatively, when the network control module determines that the DMRS SINR is greater than D2 and less than D3, and the RSRQ is less than Q2, the network control module determines that the signal quality of the first cell is less than the first signal threshold. Alternatively, when the network control module determines that the DMRS SINR is greater than D3 and less than D4, and the RSRQ is less than Q3, the network control module determines that the signal quality of the first cell is less than the first signal threshold. Alternatively, when the network control module determines that the DMRS SINR is greater than D4 and the RSRQ is less than Q4, the network control module determines that the signal quality of the first cell is less than the first signal threshold.

[0191] It can be understood that, when the first signal quality acquired by the network control module includes DMRS SINR and RSRQ, if the value of DMRS SINR is small, the value of DMRS SINR can directly reflect that the signal quality of the first cell is poor, and the network control module can determine the signal quality of the first cell according to the value of DMRS SINR. If the value of DMRS SINR cannot accurately determine the signal quality of the first cell, it can continue to determine whether the signal quality of the first cell is less than the first signal threshold based on the value of RSRQ.

[0192] In the fourth case, assuming that the first signal quality includes DMRS SINR and SSB SINR, as shown in Table 1 above, when the network control module determines that the DMRS SINR is less than D1, the network control module determines that the signal quality of the first cell is less than the first signal threshold. Alternatively, when the network control module determines that the DMRS SINR is greater than D1 and less than D2, the network control module determines that the signal quality of the first cell is less than the first signal threshold. When the network control module determines that the DMRS SINR is greater than D2 and less than D3, and the SSB SINR is less than S1, the network control module determines that the signal quality of the first cell is less than the first signal threshold. Alternatively, when the network control module determines that the DMRS SINR is greater than D3 and less than D4, and the SSB SINR is less than S2, the network control module determines that the signal quality of the first cell is less than the first signal threshold. Alternatively, when the network control module determines that the DMRS SINR is greater than D4 and less than D5, and the SSB SINR is less than S3, the network control module determines that the signal quality of the first cell is less than the first signal threshold. Alternatively, when the network control module determines that the DMRS SINR is greater than D5 and less than D6, and the SSB SINR is less than S4, the network control module determines that the signal quality of the first cell is less than the first signal threshold. Alternatively, when the network control module determines that the DMRS SINR is greater than D6, and the SSB SINR is less than S5, the network control module determines that the signal quality of the first cell is less than the first signal threshold.

[0193] It can be understood that, when the first signal quality acquired by the network control module includes DMRS SINR and SSB SINR, if the value of DMRS SINR is small, the value of DMRS SINR can directly reflect that the signal quality of the first cell is poor, and the network control module can determine that the signal quality of the first cell is less than the first signal threshold value according to the value of DMRS SINR. If the value of DMRS SINR cannot accurately determine the signal quality of the first cell, it can continue to determine whether the signal quality of the first cell is less than the first signal threshold value according to the value of SSB SINR.

[0194] In the fifth case, assuming that the first signal quality includes DMRS SINR, RSRP, RSRQ and SSB SINR, as shown in Table 1 above, when the network control module determines that the DMRS SINR is less than D1, the network control module determines that the signal quality of the first cell is less than the first signal threshold. Alternatively, when the network control module determines that the DMRS SINR is greater than D1 and less than D2, and the RSRP is less than R1, and the RSRQ is less than Q1, the network control module determines that the signal quality of the first cell is less than the first signal threshold. Alternatively, when the network control module determines that the DMRS SINR is greater than D2 and less than D3, and the RSRP is less than R2, and the RSRQ is less than Q2, and the SSBSINR is less than S1, the network control module determines that the signal quality of the first cell is less than the first signal threshold.

[0195] It should be noted that the network control module shown in Table 1 determines whether the signal quality of the first cell is less than the first signal threshold based on DMRS SINR, RSRP, RSRQ and SSBSINR. This is only an exemplary description, and all possible scenarios are not listed here one by one.

[0196] In addition, the first signal quality received by the network control module may also include DMRS SINR, RSRP and RSRQ, or DMRS SINR, RSRP and SSB SINR, or DMRS SINR, RSRQ and SSB SINR, etc. In the embodiments of the present application, all possible scenarios are no longer listed one by one.

[0197] When the mobile phone determines, based on the first signal quality, that the signal quality of the first cell is greater than the first signal threshold, the following step 603 is continued to be executed.

[0198] When the mobile phone determines, based on the first signal quality, that the signal quality of the first cell is less than the first signal threshold, the following step 604 is continued to be executed.

[0199] Step 603: The mobile phone determines to continue using the network of the first cell for uplink / downlink communications.

[0200] It can be understood that the mobile phone determines that the signal quality of the first cell is good based on the first signal quality, and does not affect the uplink / downlink communication of the mobile phone. In this case, the mobile phone can continue to use the 5G network of the first cell for uplink / downlink communication.

[0201] For example, Figure 7 As shown, when the network control module determines that the signal quality of the first cell is greater than the first signal threshold, the network control module determines to continue using the network of the first cell for uplink / downlink communication.

[0202] Step 604: The mobile phone determines whether the signal quality of the second cell is lower than the signal quality of the first cell.

[0203] In an embodiment of the present application, when the mobile phone determines that the first signal quality of the first cell is less than the first signal threshold based on the first signal quality, the mobile phone can determine whether the signal quality of the second cell is lower than the signal quality of the first cell based on the second signal quality of the second cell.

[0204] For example, continue as Figure 7 As shown, when the network control module determines that the signal quality of the first cell is less than the first signal threshold based on the first signal quality, the network control module can determine whether the signal quality of the second cell is lower than the signal quality of the first cell based on the second signal quality of the second cell.

[0205] In an embodiment of the present application, the second signal quality may include at least one of RSRP, RSRQ or SSB SINR. For example, assuming that the second signal quality includes RSRP, the network control module compares the RSRP value of the second cell with the RSRP value of the first cell to determine whether the signal quality of the second cell is lower than the signal quality of the first cell. If the network control module determines that the RSRP value of each cell in the second cell is less than the RSRP value of the first cell, the network control module determines that the signal quality of the second cell is lower than the signal quality of the first cell. If the network control module determines that the RSRP value of at least one cell in the second cell is greater than the RSRP value of the first cell, the network control module determines that there is a cell in the second cell whose signal quality is greater than the first cell.

[0206] It should be noted that the way in which the network control module determines the signal quality of the first cell and the second cell based on the RSRP value is only described as an example. The network control module can also determine the signal quality of the first cell and the second cell based on other parameters, which are not introduced here one by one.

[0207] When the mobile phone determines that the signal quality of each cell in the second cell is lower than the signal quality of the first cell, it means that the 5G signal quality of the cells that the mobile phone can search for is poor. In this case, the mobile phone can connect to the cell with better quality in the 4G network, that is, execute step 605.

[0208] When the mobile phone determines that there is a cell in the second cell with a higher signal quality than the first cell, the following step 606 is executed.

[0209] Step 605: The mobile phone disconnects from the first cell and connects to the 4G network.

[0210] It can be understood that after the mobile phone connects to the first cell, the mobile phone determines that the signal quality of the first cell is less than the first signal threshold, and the signal quality of the second cell that the mobile phone can search is less than the signal quality of the first cell, then the mobile phone can directly switch to the cell of the 4G network. In this way, the problem of poor 5G network signal and the inability of the mobile phone to perform normal uplink / downlink communication is avoided.

[0211] Here, when the mobile phone is connected to the 4G network, the mobile phone can switch to the cell with the best signal quality among all the cells covered by the searchable 4G network. The mobile phone can determine the cell with the best signal quality based on at least one parameter of RSRP, RSRQ or SSBSINR of all the cells covered by the searchable 4G network. For example, the mobile phone can determine the cell with the largest RSRP value among all the cells covered by the searchable 4G network as the cell with the best signal quality. Of course, the mobile phone can also determine the cell with the best signal quality based on other parameters of the cells covered by the 4G network, which is not limited in the embodiments of the present application.

[0212] Step 606: The mobile phone determines the target cell 1 according to the second signal quality of the second cell.

[0213] The target cell 1 refers to a cell in the second cell whose signal quality is higher than that of the first cell.

[0214] In an embodiment of the present application, when the mobile phone determines that the signal quality of the second cell is not all less than the signal quality of the first cell, the mobile phone can determine a target cell 1 in the second cell whose signal quality is higher than that of the first cell based on the second signal quality of the second cell.

[0215] For example, continue as Figure 7 As shown, the network control module determines that the signal quality of the second cell is not all less than the signal quality of the first cell. The network control module can determine the target cell 1 in the second cell whose signal quality is higher than the first cell according to the second signal quality of the second cell.

[0216] In an embodiment of the present application, the second signal quality may include at least one of RSRP, RSRQ or SSB SINR. For example, assuming that the second signal quality includes RSRP, the mobile phone compares the RSRP value of the second cell with the RSRP value of the first cell. If the mobile phone determines that the RSRP value of a cell in the second cell is greater than the RSRP value of the first cell, the mobile phone determines that the cell is the target cell 1. If the mobile phone determines that the RSRP values ​​of multiple cells in the second cell are greater than the RSRP value of the first cell, the mobile phone determines the cell with the largest RSRP value among the multiple cells as the target cell 1.

[0217] It should be noted that the method in which the mobile phone determines the target cell 1 from the second cell according to the RSRP value is only described as an example. The mobile phone can also determine the target cell 1 according to other parameters, which are not introduced here. For example, the mobile phone can also determine the target cell 1 from the second cell according to the values ​​of RSRP, RSRQ and SSB SINR. Alternatively, the mobile phone can also determine the target cell 1 from the second cell according to the values ​​of RSRP and RSRQ.

[0218] Step 607: The mobile phone disconnects from the first cell and connects to the target cell 1.

[0219] In a possible scenario of the embodiment of the present application, when the first cell and the target cell 1 belong to the same 5G base station, the process of the mobile phone disconnecting from the first cell and switching to the target cell 1 is a handover between cells within the same 5G base station. For the specific handover process, please refer to Figure 8 .like Figure 8 As shown, the cell switching process includes the following steps:

[0220] S801, the mobile phone reports the first measurement report, triggering the internal cell switching of the 5G base station.

[0221] In the embodiment of the present application, the first measurement report is used to determine whether the signal quality of the first cell currently accessed by the mobile phone meets the cell switching condition. The first measurement report may include the signal quality of the first cell and the second cell.

[0222] S802, the 5G base station sends a first switching command to the mobile phone.

[0223] The first handover command includes a radio resource control (Radio Resource Control, RRC) reconfiguration message (RRC Connection Reconfiguration), and the RRC reconfiguration message includes an identifier of the target cell 1.

[0224] The 5G base station sends a first switching command to the mobile phone according to the first measurement report, that is, the 5G base station sends an RRC reconfiguration message with a Mobility ControlInfo information element to the mobile phone. The information element identifies the RRC reconfiguration message as a switching command.

[0225] S803, after receiving the first switching command, the mobile phone reports reconfiguration completion information (RRCConnection Configuration Complete) to the target cell 1, and the switching is successful.

[0226] After receiving the Mobility ControlInfo information element, the mobile phone uses the configuration carried in the RRC reconfiguration message to access the target cell 1. After successful access, the mobile phone reports the reconfiguration completion information to the target cell 1, and the cell switching is successful.

[0227] S804, the 5G base station re-sends new measurement configuration to the mobile phone.

[0228] After the 5G base station receives the message of successful cell switching, the 5G base station re-sends the measurement configuration to the mobile phone according to the configuration of the target cell 1, that is, sends the RRC reconfiguration message.

[0229] S805: After receiving the new measurement configuration, the mobile phone reports the reconfiguration completion information to the 5G base station.

[0230] In the embodiment of the present application, after receiving the new measurement configuration, the mobile phone completes the configuration process according to the new measurement configuration and reports the reconfiguration completion information to the 5G base station. That is, the mobile phone reports RRC ConnectionConfiguration Complete to the 5G base station.

[0231] In another possible scenario of the embodiment of the present application, when the first cell and the target cell 1 belong to cells under different 5G base stations, the process of the mobile phone disconnecting from the first cell and connecting to the target cell 1 is a switching of cells under different 5G base stations. For the specific switching process, please refer to Fig. 9 .like Fig. 9 As shown, the cell switching process includes the following steps:

[0232] S901, the mobile phone reports a measurement report to the source 5G base station.

[0233] The measurement report includes the signal quality of the first cell to which the mobile phone is connected and the signal quality of the second cell. For example, the mobile phone sends a MeasurementReport to the source 5G base station to report the measurement report.

[0234] S902, the source 5G base station sends a switching request to the target 5G base station.

[0235] Among them, the switching request is used to request the target 5G base station to allocate resources to the mobile phone in the target cell 1, and trigger the establishment of a logical link between the source 5G base station and the target 5G base station.

[0236] The source 5G base station initiates a handover request to the target 5G base station where the target cell 1 is located. For example, the source 5G base station sends a HANDOVER REQUEST to the target 5G base station.

[0237] For example, after receiving the switching request, the target 5G base station allocates resources including a temporary identifier to the mobile phone in target cell 1.

[0238] S903, the target 5G base station sends a switching request confirmation to the source 5G base station.

[0239] For example, the target 5G base station sends HANDOVER REQUEST ACKNOWLEDGE to the source 5G base station.

[0240] S904: After receiving the switching command, the source 5G base station sends a switching command to the mobile phone.

[0241] The handover command carries the RRC reconfiguration information allocated by the target cell 1 to the mobile phone.

[0242] In an embodiment of the present application, after the source 5G base station sends RRC reconfiguration information to the mobile phone, the mobile phone executes switching to the target cell 1, and the source 5G base station stops sending downlink data to the mobile phone.

[0243] S905, the mobile phone reports the reconfiguration completion information to the target 5G base station.

[0244] After the mobile phone receives the handover command sent by the source 5G base station, it accesses the target cell 1 according to the RRC reconfiguration information carried in the handover command. After the mobile phone successfully accesses the target cell 1, it reports the reconfiguration completion information to the target 5G base station. That is, the mobile phone reports RRC Connection Configuration Complete to the target 5G base station.

[0245] Step 608: Target cell 1 sends the first signal quality of target cell 1 to the mobile phone, and the third cell sends the second signal quality to the mobile phone.

[0246] Here, the third cell refers to a cell that the mobile phone can search for other than the currently connected target cell 1. The third cell can be a cell under a 5G network or a cell under a 4G network, which is not limited in the embodiment of the present application.

[0247] Step 609: The mobile phone obtains the first signal quality of the target cell 1 and the second signal quality of the third cell.

[0248] In the embodiment of the present application, after the mobile phone accesses the target cell 1, the target cell 1 can send the first signal quality of the target cell 1 to the mobile phone, and the third cell can send the second signal quality to the mobile phone. Therefore, the mobile phone can obtain the first signal quality of the target cell 1 and the second signal quality of the third cell.

[0249] For example, continue as Figure 7As shown, after the target cell 1 sends the first signal quality to the modem of the mobile phone, the modem sends the first signal quality to the network control module, so that the network control module can obtain the first signal quality of the target cell 1. Similarly, after the modem obtains the second signal quality of the third cell, it sends the second signal quality to the network control module, so that the network control module can obtain the second signal quality of the third cell.

[0250] Step 610: The mobile phone determines whether the signal quality of the target cell 1 is less than the first signal threshold according to the first signal quality.

[0251] In the embodiment of the present application, the mobile phone determines whether the signal quality of the target cell 1 is less than the first signal threshold according to the first signal quality. The implementation process of determining whether the signal quality of the first cell is less than the first signal threshold in the above step 602 can be referred to, and will not be repeated here.

[0252] Step 611 , the mobile phone determines, based on the second signal quality of the third cell, that the signal quality of the third cell is lower than the signal quality of the target cell 1 .

[0253] In the embodiment of the present application, the implementation process of step 611 can refer to the implementation process of the above-mentioned step 604, which will not be repeated here.

[0254] Step 612: The mobile phone disconnects from the target cell 1.

[0255] Step 613: The mobile phone switches to a cell in the 4G network.

[0256] In the embodiment of the present application, the process of the mobile phone disconnecting from the target cell 1 and switching to the target cell under the 4G network can be seen in Fig.10 The implementation process. Fig.10 As shown, the switching process may include the following steps:

[0257] S1001, the mobile phone sends a second measurement report to the source 5G base station.

[0258] The second measurement report includes the signal quality of the target cell 1 and at least one cell other than the target cell 1 .

[0259] For example, the mobile phone sends MeasurementReport to the source 5G base station to send the second measurement report.

[0260] S1002, the source 5G base station sends a switching request to the 5G core network.

[0261] For example, the source 5G base station sends HANDOVER REQUIRED to the 5G core network to send a handover request.

[0262] S1003, the 5G core network sends a switching request to the 4G core network.

[0263] For example, the 5G core network sends a Relocation request to the 4G core network to send a switching request.

[0264] S1004, the 4G core network sends a switching request to the 4G base station.

[0265] For example, the 4G core network initiates a HANDOVER REQUEST handover request to the 4G base station where the designated target cell is located.

[0266] S1005, the 4G base station sends a switching request confirmation instruction to the 5G core network.

[0267] For example, the 4G base station sends HANDOVER REQUEST ACKNOWLEDGE to the 5G core network.

[0268] S1006, the 4G core network sends a switching confirmation instruction to the 5G core network.

[0269] For example, the 4G core network sends a Relocation response to the 5G core network.

[0270] S1007, the 5G core network sends a handover instruction message to the source 5G base station.

[0271] The handover instruction message includes an address and a tunnel endpoint identifier (TEID) used for forwarding.

[0272] For example, the 5G core network sends a HANDOVER COMMAND message to the source 5G base station to send a handover command message.

[0273] S1008, the source 5G base station sends RRC reconfiguration information to the mobile phone.

[0274] For example, the source 5G base station sends RRC reconfiguration information to the mobile phone to notify the mobile phone to switch to the 4G base station.

[0275] S1009, the mobile phone sends RRC reconfiguration completion information to the 4G base station.

[0276] The mobile phone initiates a random access process at the 4G base station, and after successful random access, sends an RRC reconfiguration completion message to the 4G base station.

[0277] It can be understood that after the mobile phone accesses the first cell, the mobile phone determines that the signal quality of the first cell is less than the first signal threshold, and the signal quality of the second cell that the mobile phone can search for is not all lower than the signal quality of the first cell, then the mobile phone switches from the first cell to the target cell 1. After the mobile phone successfully connects to the target cell 1, the mobile phone determines that the signal quality of the target cell 1 is less than the first signal threshold, and the mobile phone determines that the signal quality of the third cell is less than the signal quality of the target cell 1. In this case, it means that the signal quality of the 5G network that the mobile phone can cover is poor, and it is impossible to ensure normal uplink / downlink communication of the mobile phone. The mobile phone can directly switch the connected network from the 5G network to the 4G network.

[0278] Therefore, compared with the related technology in which the 5G network signal accessed by the mobile phone is poor, after the mobile phone is connected to the 5G network, phenomena such as call failure and dropped calls frequently occur, resulting in the mobile phone being unable to perform normal uplink / downlink communications. In the embodiments of the present application, the frequency of unreachable calls or dropped calls is reduced by timely switching the network accessed by the mobile phone.

[0279] In a possible scenario of an embodiment of the present application, after the mobile phone accesses a cell under a 4G base station, the mobile phone can determine in real time or periodically the signal quality of a cell (for example, cell c) currently accessing the 4G network, as well as the signal quality of other cells that the mobile phone can search for. When the mobile phone determines that the signal quality of the currently accessed 4G cell is less than the third signal threshold, the mobile phone can determine a cell (for example, cell d) whose signal quality is greater than that of cell c from other cells that the mobile phone can search for. Then, the mobile phone can switch the connected cell, that is, switch from cell c to cell d. After the mobile phone is connected to cell d, the mobile phone continues to determine in real time or periodically the signal quality of cell d, as well as the signal quality of other cells that the mobile phone can search for, to determine whether to perform cell switching.

[0280] When the mobile phone accesses cell d, if the mobile phone determines that the signal quality of cell d is less than the third signal threshold, and the signal quality of other cells that the mobile phone can search is less than the signal quality of cell d, the mobile phone can switch the connected network to the 2G network.

[0281] In another possible scenario of the embodiment of the present application, during the process of the mobile phone accessing the cell c covered by the 4G network, after the mobile phone determines that the signal quality of the cell c is less than the third signal threshold, the mobile phone determines that there is no cell with a signal quality greater than the cell c among other cells that can be searched. In this case, the network to which the mobile phone is connected can be directly switched from the 4G network to the 2G network.

[0282] The following is combined with Fig.11 and attached Fig.12 The above process is explained in detail. Fig.11As shown, the cell switching method may include the following steps:

[0283] Step 1101: After the mobile phone accesses the fourth cell, the mobile phone obtains the third signal quality of the fourth cell and the fourth signal quality of the fifth cell.

[0284] The fourth cell refers to a cell in the 4G network that the mobile phone is currently connected to. The fifth cell refers to a cell in the 4G network that the mobile phone can search for, except for the cell that is currently connected to.

[0285] In the embodiment of the present application, the fifth cell may be one or more. The number of the fifth cells is based on the number of cells covering the 4G network actually searched by the mobile phone, and is not limited here. When there are multiple fifth cells, the fourth signal quality of the fifth cell is actually obtained by obtaining the signal quality of each cell corresponding to the multiple cells. In the embodiment of the present application, multiple fifth cells are used for exemplary description.

[0286] Among them, the third signal quality is used to measure the signal quality of the cell currently accessed by the mobile phone, and the fourth signal quality is used to measure the signal quality of the cell covering the 4G network that the mobile phone can search for, except for the cell currently accessed.

[0287] Here, the third signal quality and the fourth signal quality may be the same or different, and are not limited here. The third signal quality may include at least one of TRS, RSRP, RSRQ, or SSB SINR, and the fourth signal quality may also include at least one of TRS, RSRP, RSRQ, or SSB SINR.

[0288] For example, the third signal quality and the fourth signal quality obtained by the mobile phone may both include TRS and RSRP. Alternatively, the third signal quality obtained by the mobile phone includes TRS and RSRP, and the fourth signal quality obtained by the mobile phone includes TRS and RSRQ.

[0289] Step 1102: The mobile phone determines whether the signal quality of the fourth cell is less than the third signal threshold according to the third signal quality.

[0290] In the embodiment of the present application, after the mobile phone obtains the third signal quality of the fourth cell, the mobile phone determines whether the signal quality of the fourth cell is less than the third signal threshold based on the third signal quality.

[0291] For example, Fig.12 As shown, after the network control module receives the third signal quality sent by the modem, the network control module determines whether the signal quality of the fourth cell is less than the third signal threshold according to the third signal quality.

[0292] In an embodiment of the present application, the third signal quality may include at least one of TRS, RSRP, RSRQ or SSB SINR, and the network control module may determine whether the signal quality of the fourth cell is less than the third signal threshold based on at least one parameter among TRS, RSRP, RSRQ or SSB SINR.

[0293] For example, the network control module may determine whether the signal quality of the fourth cell is less than the third signal threshold value based on the TRS. Specifically, when the network control module determines that the TRS is less than the threshold value 1, the network control module determines that the signal quality of the fourth cell is less than the third signal threshold value. When the network control module determines that the TRS is greater than the threshold value 1, the network control module determines that the signal quality of the fourth cell is greater than the third signal threshold value.

[0294] It can be understood that the value of TRS can reflect the signal quality of the fourth cell currently accessed by the mobile phone. The larger the value of TRS, the better the signal quality of the fourth cell accessed by the mobile phone, and the smaller the value of TRS, the worse the signal quality of the fourth cell accessed by the mobile phone.

[0295] For another example, the network control module may determine whether the signal quality of the fourth cell is less than the third signal threshold value based on TRS and RSRP. Specifically, when the network control module determines that TRS is less than threshold 1, the network control module determines that the signal quality of the fourth cell is less than the third signal threshold value. Alternatively, when the network control module determines that TRS is greater than threshold 1 and less than threshold 2, and RSRP is less than threshold 3, the network control module determines that the signal quality of the fourth cell is less than the third signal threshold value.

[0296] It can be understood that, when the third signal quality obtained by the network control module includes TRS and RSRP, if the value of TRS is small, the value of TRS can directly reflect that the signal quality of the fourth cell is poor, and the network control module can determine that the signal quality of the fourth cell is less than the third signal threshold value according to the value of TRS. If the value of TRS cannot accurately determine the signal quality of the first cell, it can continue to determine whether the signal quality of the fourth cell is less than the third signal threshold value according to the value of RSRP.

[0297] It needs to be explained that the method by which the above-mentioned network control module determines the signal quality of the fourth cell is only described as an example. The network control module can also determine whether the signal quality of the fourth cell is less than the second signal threshold based on TRS, RSRP and RSRQ, or the network control module can also determine whether the signal quality of the fourth cell is less than the third signal threshold based on TRS, RSRP, RSRQ and SSB SINR, and so on. The specific implementation process will not be explained in detail one by one here.

[0298] Step 1103: The mobile phone determines to continue using the network of the fourth cell for uplink / downlink communications.

[0299] It can be understood that the mobile phone determines, based on the third signal quality, that the signal quality of the 4G network covered by the fourth cell does not meet the preset condition 2, and does not affect the uplink / downlink communication of the mobile phone. In this case, the mobile phone continues to use the 4G network of the fourth cell for uplink / downlink communication.

[0300] For example, Fig.12 As shown, the network control module determines that the signal quality of the fourth cell is greater than the second signal threshold based on the third signal quality, and the network control module determines to continue using the network of the fourth cell for uplink / downlink communication.

[0301] Step 1104: The mobile phone determines whether the signal quality of the fifth cell is lower than the signal quality of the fourth cell.

[0302] In an embodiment of the present application, when the mobile phone determines that the signal quality of the fourth cell is less than the third signal threshold based on the third signal quality, the mobile phone can judge whether the signal quality of the fifth cell is less than the signal quality of the fourth cell based on the fourth signal quality of the fifth cell.

[0303] For example, continue as Fig.12 As shown, when the network control module determines that the signal quality of the fourth cell is less than the third signal threshold based on the third signal quality, the network control module can determine whether the signal quality of the fifth cell is less than the signal quality of the fourth cell based on the fourth signal quality of the fifth cell.

[0304] In an embodiment of the present application, the fourth signal quality may include at least one of RSRP, RSRQ or SSB SINR. For example, assuming that the fourth signal quality includes RSRP, the network control module compares the RSRP value of the fourth cell with the RSRP value of the fourth cell to determine whether the signal quality of the fifth cell is less than the signal quality of the fourth cell. If the network control module determines that the RSRP value of each cell in the fifth cell is less than the RSRP value of the fourth cell, the network control module determines that the signal quality of the fifth cell is less than the signal quality of the fourth cell. If the network control module determines that the RSRP value of at least one cell in the fifth cell is greater than the RSRP value of the fourth cell, the network control module determines that there is a cell in the fifth cell whose signal quality is greater than that of the fourth cell.

[0305] It should be noted that the way in which the network control module determines the signal quality of the fourth cell and the fifth cell based on the RSRP value is only described as an example. The network control module can also determine the signal quality of the fourth cell and the fifth cell based on other parameters, which are not introduced one by one here.

[0306] When the mobile phone determines that the signal quality of each cell in the fifth cell is less than the signal quality of the fourth cell, it means that the 4G signal quality of the cells that the mobile phone can search for is poor. In this case, the mobile phone can connect to the 2G network, that is, execute step 1105.

[0307] When the mobile phone determines that there is a cell in the fifth cell with a higher signal quality than the fourth cell, the following step 1106 is executed.

[0308] Step 1105, the mobile phone disconnects from the fourth cell and connects to the 2G network.

[0309] It can be understood that after the mobile phone accesses the fourth cell, the mobile phone determines that the signal quality of the fourth cell is less than the second signal threshold, and the signal quality of the fifth cell that the mobile phone can search is less than the signal quality of the fourth cell, and the mobile phone can directly switch to the 2G network. In this way, the problem of the poor 4G network signal and the inability of the mobile phone to perform normal uplink / downlink communication is avoided.

[0310] Step 1106: The mobile phone determines the target cell 2 according to the fourth signal quality of the fifth cell.

[0311] The target cell 2 refers to a cell in the fifth cell whose signal quality is higher than that of the fourth cell.

[0312] In an embodiment of the present application, when the mobile phone determines that the signal quality of the fifth cell is not all lower than the signal quality of the fourth cell, the mobile phone can determine a target cell 2 in the fifth cell whose signal quality is higher than that of the fourth cell based on the fourth signal quality of the fifth cell.

[0313] For example, continue as Fig.12 As shown, the network control module determines that the signal quality of the fifth cell is not all less than the signal quality of the fourth cell. The network control module can determine the target cell 2 in the fifth cell whose signal quality is higher than that of the fourth cell according to the fourth signal quality of the fifth cell.

[0314] In an embodiment of the present application, the fourth signal quality may include at least one of RSRP, RSRQ and SSB SINR. For example, assuming that the fourth signal quality includes RSRP, the mobile phone compares the RSRP value of the fifth cell with the RSRP value of the fourth cell. If the network control module determines that the RSRP value of one cell in the fifth cell is greater than the RSRP value of the fourth cell, the network control module determines that the cell is the target cell 2. If the network control module determines that the RSRP values ​​of multiple cells in the fifth cell are greater than the RSRP value of the fourth cell, the network control module determines the cell with the largest RSRP value among the multiple cells as the target cell 2.

[0315] It should be noted that the method in which the network control module determines the target cell 2 from the fifth cell according to the RSRP value is only described as an example. The network control module can also determine the target cell 2 according to other parameters, which are not introduced here. For example, the network control module can also determine the target cell 2 from the fifth cell according to the values ​​of RSRP, RSRQ and SSB SINR. Alternatively, the network control module can also determine the target cell 2 from the fifth cell according to the values ​​of RSRP and RSRQ.

[0316] Step 1107 , the mobile phone disconnects from the fourth cell and connects to the target cell 2 .

[0317] In the embodiment of the present application, the implementation process of the mobile phone disconnecting from the fourth cell under the 4G network and accessing the target cell 2 can refer to the implementation process of the cell switching of the 4G network in the prior art, which is not introduced in detail here.

[0318] Step 1108: Target cell 2 sends the third signal quality to the mobile phone, and the sixth cell sends the fourth signal quality to the mobile phone.

[0319] Here, the sixth cell refers to a cell that can be searched by the mobile phone except the currently connected target cell 2.

[0320] Step 1109: The mobile phone obtains the third signal quality of the target cell 2 and the fourth signal quality of the sixth cell.

[0321] In the embodiment of the present application, after the mobile phone accesses the target cell 2, the target cell 2 can send the third signal quality of the target cell 2 to the mobile phone, and the sixth cell can send the fourth signal quality to the mobile phone. Therefore, the mobile phone can obtain the third signal quality of the target cell 2 and the fourth signal quality of the sixth cell.

[0322] For example, continue as Fig.12 As shown, after the target cell 2 sends the third signal quality to the modem of the mobile phone, the modem sends the third signal quality to the network control module, so that the network control module can obtain the third signal quality of the target cell 2. Similarly, after the modem obtains the fourth signal quality of the sixth cell, it sends the fourth signal quality to the network control module, so that the network control module can obtain the fourth signal quality of the sixth cell.

[0323] Step 1110: The mobile phone determines whether the signal quality of the target cell 2 is less than a third signal threshold according to the third signal quality.

[0324] In the embodiment of the present application, the implementation process of the mobile phone determining whether the signal quality of the target cell 2 is less than the third signal threshold according to the third signal quality can be referred to the implementation process of the above step 1102, which will not be repeated here.

[0325] Likewise, Fig.12 For the implementation process of the network control module in determining whether the signal quality of the target cell 2 is less than the third signal threshold according to the third signal quality, reference may be made to the implementation process of the above step 1102, which will not be repeated here.

[0326] Step 1111 : The mobile phone determines, based on the fourth signal quality of the sixth cell, that the signal quality of the sixth cell is lower than the signal quality of the target cell 2 .

[0327] In the embodiment of the present application, the implementation process of step 1111 can refer to the implementation process of the above-mentioned step 1104, which will not be repeated here.

[0328] Fig.12 The network control module determines, according to the fourth signal quality of the sixth cell, that the signal quality of the sixth cell is less than the signal quality of the target cell 2.

[0329] Step 1112: The mobile phone disconnects from the target cell 2.

[0330] Step 1113, the mobile phone connects to the 2G network.

[0331] In the embodiment of the present application, the process of the mobile phone disconnecting from the target cell 2 covering the 4G network and switching to the cell under the 2G network can be referred to the implementation process in the relevant technology, and will not be described in detail here.

[0332] It can be understood that when the mobile phone accesses the fourth cell of the 4G network, the mobile phone determines that the third signal quality of the fourth cell is less than the third signal threshold, and the signal quality of the fifth cell that the mobile phone can search is not all lower than the signal quality of the fourth cell, then the mobile phone switches the connected network from the fourth cell to the target cell 2. After the mobile phone accesses the target cell 2, the mobile phone determines that the third signal quality of the target cell 2 is less than the third signal threshold, and the mobile phone determines that the signal quality of the sixth cell is less than the signal quality of the target cell 2, and the mobile phone can directly switch to the cell with better signal quality under the 2G network. In this way, the problem of poor 4G network signal and the inability of the mobile phone to perform normal uplink / downlink communication is avoided.

[0333] like Fig.13As shown, the embodiment of the present application discloses a terminal device, which can be the above-mentioned mobile phone. The terminal device may specifically include: a touch screen 1301, wherein the touch screen 1301 includes a touch sensor 1306 and a display screen 1307; one or more processors 1302; a memory 1303; one or more application programs (not shown); and one or more computer programs 1304, and the above-mentioned components may be connected via one or more communication buses 1305. Among them, the above-mentioned one or more computer programs 1304 are stored in the above-mentioned memory 1303 and are configured to be executed by the one or more processors 1302, and the one or more computer programs 1304 include instructions, which can be used to execute the relevant steps in the above-mentioned embodiment.

[0334] It is understandable that, in order to realize the above functions, the above-mentioned terminal devices etc. include hardware structures and / or software modules corresponding to the execution of each function. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, the embodiments of the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. 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 of the embodiments of the present invention.

[0335] The embodiment of the present application can divide the functional modules of the above-mentioned terminal device etc. according to the above-mentioned method example. For example, each functional module can be divided corresponding to each function, or two or more functions can be integrated into one processing module. The above-mentioned integrated module can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiment of the present invention is schematic and is only a logical function division. There may be other division methods in actual implementation.

[0336] In the case of dividing each functional module according to each function, a possible composition diagram of the terminal device involved in the above embodiment, the terminal device may include: a display unit, a transmission unit and a processing unit, etc. It should be noted that all relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding functional module, and will not be repeated here.

[0337] The embodiment of the present application also provides a terminal device, including one or more processors and one or more memories. The one or more memories are coupled to the one or more processors, and the one or more memories are used to store computer program codes, and the computer program codes include computer instructions. When the one or more processors execute the computer instructions, the terminal device executes the above-mentioned related method steps to implement the cell switching method in the above-mentioned embodiment.

[0338] An embodiment of the present application also provides a computer-readable storage medium, which stores computer instructions. When the computer instructions are executed on a terminal device, the terminal device executes the above-mentioned related method steps to implement the cell switching method in the above-mentioned embodiment.

[0339] An embodiment of the present application further provides a computer program product, which includes computer instructions. When the computer instructions are executed on a terminal device, the terminal device executes the above-mentioned related method steps to implement the cell switching method in the above-mentioned embodiment.

[0340] In addition, an embodiment of the present application also provides a device, which may specifically be a chip, component or module, and the device may include a connected processor and a memory; wherein the memory is used to store computer execution instructions, and when the device is running, the processor may execute the computer execution instructions stored in the memory so that the device executes the cell switching method executed by the terminal device in the above-mentioned method embodiments.

[0341] Among them, the terminal equipment, computer-readable storage medium, computer program product or device provided in this embodiment are all used to execute the corresponding methods provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding methods provided above, and will not be repeated here.

[0342] Through the description of the above implementation methods, technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device and unit described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0343] Each functional unit in each embodiment of the present application can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of software functional units.

[0344] If the integrated unit is implemented in the form of a software functional unit 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 of the embodiment of the present application is essentially or the part that contributes to the prior art or all 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.) or a processor to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as flash memory, mobile hard disk, read-only memory, random access memory, disk or optical disk.

[0345] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A cell switching method, characterized in that: The method comprises: Obtaining signal quality of each of the multiple cells by signal measurement, wherein the multiple cells include a serving cell of the terminal device and at least one cell other than the serving cell, and the signal quality is a signal to interference plus noise ratio DMRS SINR of a demodulation reference signal of each of the multiple cells; When the signal quality of the serving cell is less than a first signal threshold, the terminal device is triggered to switch to a target cell among the at least one cell, wherein the target cell is a cell among the at least one cell having a signal quality greater than a second signal threshold, and the second signal threshold is greater than the first signal threshold.

2. The method according to claim 1, characterized in that The triggering, when the signal quality of the serving cell is less than a first signal threshold, of switching the terminal device to a target cell in the at least one cell includes: When the signal quality of the serving cell is less than the first signal threshold, the terminal device reports a first measurement report to the first base station, where the first measurement report includes the signal quality of the serving cell and the at least one cell; receiving a first handover command sent by the first base station according to the first measurement report, where the first handover command includes a radio resource control RRC reconfiguration message, and the RRC reconfiguration message includes an identifier of the target cell; Switch to the target cell according to the RRC reconfiguration message.

3. The method according to claim 2, characterized in that The serving cell and the target cell both belong to the first base station.

4. The method according to claim 2, characterized in that: The serving cell belongs to the first base station, the target cell belongs to the second base station, and the RRC reconfiguration message carries a switching instruction sent by the second base station to the first base station after receiving the resource allocation request sent by the first base station.

5. The method according to any one of claims 1 to 4, characterized in that: The serving cell and the target cell belong to cells under different network standards, and when the signal quality of the serving cell is less than a first signal threshold, triggering the terminal device to switch to a target cell in the at least one cell, includes: When the signal quality of the serving cell is less than the first signal threshold, sending a second measurement report to the third base station, so that after the third base station sends a handover request to the first core network according to the measurement result of the second measurement report, the first core network sends the handover request to the fourth base station through the second core network, and the fourth base station sends a second handover command to the third base station through the second core network and the first core network, the handover request includes the identifier of the target cell, and the second handover command is used to instruct the terminal device to switch to the target cell; receiving the second handover command sent by the third base station, where the second handover command includes an RRC reconfiguration message; After switching to the target cell according to the RRC reconfiguration message, an RRC reconfiguration completion message is sent to the fourth base station.

6. The method according to any one of claims 1 to 5, characterized in that: The DMRS SINR corresponds to a plurality of parameter value intervals. After obtaining the signal quality of each of the plurality of cells through signal measurement, the method further includes: If it is determined that the DMRS SINR of the serving cell satisfies the corresponding parameter value interval, it is determined that the signal quality of the serving cell is less than the first signal threshold.

7. The method according to any one of claims 1 to 6, characterized in that: The signal quality further includes at least one of a reference signal received power RSRP, a reference signal received quality RSRQ, or a signal to interference plus noise ratio SSB SINR of a synchronization broadcast block.

8. A terminal device, characterized in that: include: one or more processors; Memory; One or more computer programs are stored in the memory, and the one or more computer programs include instructions. When the instructions are executed by the terminal device, the terminal device executes the cell switching method as described in any one of claims 1 to 7.

9. A computer-readable storage medium, wherein instructions are stored in the computer-readable storage medium, characterized in that: When the instruction is executed on the terminal device, the terminal device executes the cell switching method according to any one of claims 1 to 7.

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