WO2021179973A1

WO2021179973A1 - Method and apparatus for dual-connectivity recovery

Info

Publication number: WO2021179973A1
Application number: PCT/CN2021/078937
Authority: WO
Inventors: 智钢; 魏珍荣; 徐自翔; 何彦召
Original assignee: 华为技术有限公司
Priority date: 2020-03-13
Filing date: 2021-03-03
Publication date: 2021-09-16
Also published as: CN113395787A; CN113395787B

Abstract

Disclosed in the embodiments of the present application are a method and apparatus for dual-connectivity recovery. The method can be applied to a terminal device side, relates to the field of 5G NR and artificial intelligence communications, and comprises: a terminal device being connected to a 4G base station and a 5G base station by means of LTE-NR dual-connectivity technology; when a first preset condition is met, the terminal device releasing the connection with the 5G base station, such that the terminal device communicates with the 4G base station; and when a second preset condition is met, the terminal device releasing the connection with the 4G base station, such that the terminal device is reconnected to the 4G base station and the 5G base station by means of the LTE-NR dual-connectivity technology. By means of the method, a 4G base station adds a secondary base station for a terminal device without the need to wait for a secondary base station addition interval to expire, such that the delay of dual-connectivity recovery can be effectively reduced.

Description

Method and device for restoring dual connection

Cross-references to related applications

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office, the application number is 202010177775.1, and the application name is "a method and device for restoring dual connections" on March 13, 2020. The entire content is incorporated herein by reference. Applying.

Technical field

This application relates to the field of communication technology, and in particular to a method and device for restoring dual connections.

Background technique

At present, in the fifth generation mobile communication technology (the 5th generation, 5G) standard, two networking solutions have been introduced: non-stand alone (NSA) and stand alone (SA). As a transition plan, non-independent networking takes the improvement of bandwidth in hotspots as the main goal. In non-independent networking, 5G base stations do not have independent signaling planes, relying on the 4th-generation (4G) base stations and 4G core network work. Independent networking can realize all the new features of 5G, which is conducive to exerting all the capabilities of 5G, and it is a recognized 5G target solution in the industry.

In the early stage of 5G network construction, due to practical problems such as technical capabilities and equipment costs, non-independent networking solutions were temporarily used to set up 5G networks. In the non-independent networking scheme, terminal equipment can connect to two base stations at the same time, one of which is a 4G base station, which can be used as the primary base station of the terminal equipment, and the other base station is a 5G base station, which can be used as a secondary base station for the terminal equipment. The cell group provided by the primary base station may be referred to as a master cell group (MCG), and the cell group provided by the secondary base station may be referred to as a secondary cell group (SCG).

In order to save network resources and the power consumption of the terminal device, in some application scenarios, the secondary base station of the terminal device can be released. At this time, the terminal device and the primary base station still maintain an RRC connection. However, in this case, how to restore the dual connection still needs further research.

Summary of the invention

The embodiments of the present application provide a method and device for restoring dual connections, so as to reduce the delay of restoring dual connections and improve user experience.

In the first aspect, the embodiment of the present application provides a method for restoring dual connectivity. In this method, a terminal device connects a 4G base station and a 5G base station through LTE-NR dual connectivity technology; when the first preset condition is met, the terminal device releases Connect with the 5G base station to enable the terminal device to communicate with the 4G base station; when the second preset condition is met, the terminal device releases the connection with the 4G base station, so that the terminal device is connected via LTE-NR dual connection Technology reconnects 4G base stations and 5G base stations.

In this way, after the connection between the terminal equipment and the 5G base station is released, when the dual connection needs to be restored, the connection between the terminal equipment and the 4G base station can be released, and the 4G base station and the 5G base station can be reconnected. Add the time delay of the secondary base station.

In a possible design, the terminal device includes an RRC layer, and the terminal device reconnects a 4G base station and a 5G base station through LTE-NR dual connectivity technology, including: the RRC layer sends an RRC connection establishment to the 4G base station Request message, the RRC connection establishment request message is used to request to establish a connection with the 4G base station; the RRC layer receives a secondary base station addition instruction from the 4G base station, and establishes with the 5G base station according to the secondary base station addition instruction Connection, and the secondary base station addition indication is used to indicate radio resources used for establishing a connection with the 5G base station.

In a possible design, the terminal device includes an application layer and an RRC layer; the terminal device releasing the connection with the 4G base station includes: the application layer sends first signaling to the RRC layer, A signaling is used to indicate that the second preset condition is met; after receiving the first signaling, the RRC layer releases the connection with the 4G base station.

In a possible design, the terminal device includes a non-access stratum and an RRC layer; after the terminal device releases the connection with the 4G base station, it further includes: the RRC layer sends to the non-access stratum The second signaling, the second signaling is used to indicate that the terminal device has released the connection with the 4G base station; after the non-access stratum receives the second signaling, if it is determined that there is a data service, Then, third signaling is sent to the RRC layer, so that the RRC layer sends an RRC connection establishment request message to the 4G base station according to the third signaling.

In a possible design, the second signaling includes a cause value, and the cause value is used to indicate that the reason for releasing the connection with the 4G base station is that a secondary base station needs to be added.

In a possible design, the terminal device includes a non-access layer, and after the terminal device releases the connection with the 4G base station, the method further includes: the non-access layer sends a location update request to the core network device, The location update request is used to indicate that the terminal device has released the connection with the 4G base station. In this way, by sending a location update request to the core network device, the core network device can update the state of the terminal device in time, effectively avoiding inconsistencies between the network side and the terminal device side and causing the network side to judge the state of the terminal device to be abnormal.

In a possible design, the terminal device includes a display screen; the meeting the second preset condition includes: the display screen is in a bright screen state, and the data transmission rate of the terminal device is greater than or equal to the first Preset rate.

In a possible design, the meeting the first preset condition includes: the display screen is in an off-screen state, and the data transmission rate of the terminal device is less than or equal to the second preset rate.

In a possible design, the terminal device includes a display screen; when the terminal device is connected to a 4G base station and a 5G base station, the 5G network identification is displayed on the display screen; when the terminal device releases and the After the 5G base station is connected, the identification of the 4G network is displayed on the display screen.

In the second aspect, the embodiment of the present application provides a method for restoring dual connectivity. In this method, a terminal device connects a 4G base station and a 5G base station through LTE-NR dual connectivity technology; when the first preset condition is met, the terminal device releases The connection with the 5G base station; after the terminal device releases the connection with the 5G base station, when the second preset condition is met, the terminal device sends an RRC connection re-establishment request message to the 4G base station, so that the terminal device can recover Connection with 5G base station.

In this way, after the connection between the terminal device and the 5G base station is released, when the dual connection needs to be restored, the reconnection process can be triggered to restore the connection with the 5G base station, so there is no need to wait for the secondary base station addition interval to expire, which can effectively reduce the cost of adding secondary base stations. Time delay.

In a possible design, the terminal device includes an RRC layer, and after the RRC layer sends an RRC connection re-establishment request message to the 4G base station, it receives a secondary base station addition instruction from the 4G base station, and according to the A secondary base station addition instruction is used to establish a connection with the 5G base station, and the secondary base station addition instruction is used to indicate a radio resource used for establishing a connection with the 5G base station.

In a possible design, the terminal device includes the application layer and the RRC layer; the terminal device sending the RRC connection re-establishment request message to the 4G base station includes: the application layer sends the first signaling to the RRC layer, and the first signaling is used to indicate Meet the second preset condition; after receiving the first signaling, the RRC layer sends an RRC connection re-establishment request message to the 4G base station.

In a possible design, the terminal device includes a display screen; meeting the second preset condition may mean: the display screen is in a bright screen state, and the data transmission rate of the terminal device is greater than or equal to the first preset rate .

In a possible design, meeting the first preset condition may mean that the display screen is in an off-screen state, and the data transmission rate of the terminal device is less than or equal to the second preset rate.

In a possible design, the terminal device includes a display screen; when the terminal device is connected to a 4G base station and a 5G base station, the 5G network identifier is displayed on the display screen; when the terminal device releases and the After the 5G base station is connected, the identification of the 4G network is displayed on the display screen.

In a third aspect, an embodiment of the present invention provides a terminal device, which includes a functional unit for executing the method described in the first aspect or the second aspect above.

In a fourth aspect, an embodiment of the present invention provides yet another terminal device, including a memory and at least one processor coupled with the memory; the memory is used to store instructions, and the processor is used to execute the instructions; wherein, When the processor executes the instruction, the method described in the first aspect or the second aspect is executed.

In some possible implementation manners, the terminal device further includes a communication interface for communicating with the processor, and the communication interface is used to communicate with other devices (such as 4G base stations and 4G base stations) under the control of the processor. 5G base station, etc.) to communicate.

In the fifth aspect, an embodiment of the present invention provides a system chip (such as an SOC chip), including an application processor and a baseband processor. The baseband processor includes a non-access layer and an RRC layer. The application processor is used to determine whether the terminal device is in a low-speed application scenario and whether it is in a high-speed application scenario, and the baseband processor is used to release the connection between the terminal device and the 5G base station when the terminal device is in the low-speed application scenario And when the terminal device is in a high-speed application scenario, the connection between the terminal device and the 4G base station is released, so that the terminal device reconnects the 4G base station and the 5G base station.

Regarding the content that is not shown or described in the embodiments of the present invention, please refer to the related descriptions in the foregoing first aspect or second aspect for details, which will not be repeated here.

In a sixth aspect, a computer-readable storage medium is provided, and the computer-readable storage medium stores program codes for network connection processing. The program code includes instructions for executing the method described in the first aspect or the second aspect.

In a seventh aspect, a computer program product is provided. When the computer reads and executes the computer program product, the computer executes any one of the possible design methods of the first aspect or the second aspect.

On the basis of the implementation manners provided by the above aspects, the present invention can be further combined to provide more implementation manners.

Description of the drawings

FIG. 1 is a schematic diagram of a network architecture to which an embodiment of this application is applicable;

FIG. 2 is a schematic structural diagram of a terminal device provided by an embodiment of the application;

FIG. 3a is a schematic diagram of a secondary base station adding interval provided by an embodiment of the application;

FIG. 3b is a schematic flowchart of a method for adding a secondary base station to a terminal device according to the data flow of the terminal device according to an embodiment of the application;

Figure 4a is a schematic diagram of a protocol layer structure provided by an embodiment of the application;

Figure 4b is a schematic diagram of a service request process provided by an embodiment of this application;

FIG. 5 is a schematic diagram of displaying a network identity provided by an embodiment of the application;

FIG. 6 is a schematic flowchart corresponding to the method for restoring dual connections provided in Embodiment 1 of this application;

FIG. 7 is a schematic flowchart corresponding to the method for restoring dual connections provided in the second embodiment of the application; FIG.

FIG. 8 is a schematic diagram of changes in the network identifier displayed in the status bar of the terminal device according to an embodiment of the application;

FIG. 9 is a possible exemplary block diagram of a device involved in an embodiment of this application;

FIG. 10 is a schematic structural diagram of a system chip provided by an embodiment of the application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

FIG. 1 is a schematic diagram of a network architecture to which an embodiment of this application is applicable. As shown in FIG. 1, the terminal device 103 can access a wireless network to obtain services from an external network (such as the Internet) through the wireless network, or communicate with other devices through the wireless network, for example, it can communicate with other terminal devices.

The wireless network includes a radio access network (RAN) and a core network (CN). Among them, the RAN is used to connect the terminal device 103 to the wireless network, and the CN is used to manage the terminal device and provide The gateway to communicate with the external network. The RAN may include one or more RAN devices, such as the RAN device 1011, the RAN device 1012, and the CN may include one or more CN devices, such as the CN device 102. The terminal device 103 may be simultaneously connected to two RAN devices, such as the RAN device 1011, and the RAN device 1012, in a dual connectivity (DC) manner.

It should be understood that the number of devices in the communication system shown in FIG. 1 is only for illustration, and the embodiments of the present application are not limited to this. In actual applications, the communication system may also include more terminal devices and more RAN devices. Other devices can also be included.

The network architecture shown in Figure 1 above can be applied to various radio access technology (RAT) communication systems, such as a 4G communication system, a 5G communication system, or a 4G communication system and The transition system between 5G communication systems can of course also be the future communication system. Among them, the 5G communication system can also be called a new radio (NR) communication system, and the 4G communication system can also be called a long term evolution (LTE) communication system. The network architecture and business scenarios described in the embodiments of this application are intended to more clearly illustrate the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided in the embodiments of this application. Those of ordinary skill in the art will know that with communication With the evolution of the network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are equally applicable to similar technical problems.

Among them, the RAN device may also be called a base station, which may refer to a device that communicates with wireless terminal devices through one or more cells at an air interface in an access network. At present, some examples of RAN equipment are: a new generation Node B (gNB) in a 5G communication system (also called a 5G base station), and an evolved Node B (eNB) in a 4G communication system ( It can also be called 4G base station), radio network controller (RNC), node B (Node B, NB), base station controller (BSC), base transceiver station (base transceiver station, BTS) , Home base station (for example, home evolved NodeB, or home Node B, HNB), baseband unit (BBU), wireless fidelity (Wi-Fi) access point (AP), road The side unit (road side unit, RSU), the access point in the integrated access and backhaul (IAB) system, the control node and the terminal node in the TSN network, etc. In addition, in a network structure, the RAN device may include a centralized unit (CU) node, or a distributed unit (DU) node, or a RAN device including a CU node and a DU node.

Terminal equipment can also be called user equipment (UE), which can be deployed on land, including indoor or outdoor, handheld or vehicle-mounted; it can also be deployed on the water (such as ships, etc.); it can also be deployed in the air (for example, Airplanes, balloons and satellites etc.). The terminal device may be a mobile phone (mobile phone), a tablet computer (pad), a computer with wireless transceiver function, virtual reality (VR) equipment, augmented reality (AR) equipment, industrial control (industrial control) Wireless devices in ), wireless devices in self-driving, wireless devices in remote medical, wireless devices in smart grid, and wireless devices in transportation safety , Wireless devices in smart cities, wireless devices in smart homes, etc.

Figure 2 exemplarily shows a schematic structural diagram of a terminal device.

As shown in FIG. 2, the terminal device 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, and a battery 142, Antenna 1, antenna 2, mobile communication module 150, wireless communication module 160, audio module 170, speaker 170A, receiver 170B, microphone 170C, earphone interface 170D, sensor module 180, button 190, motor 191, indicator 192, camera 193, A display screen 194, a subscriber identification module (SIM) card interface 195, and so on. 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, and ambient light Sensor 180L, bone conduction sensor 180M, etc. In FIG. 2, antenna 1 and antenna 2 are used as examples, and optionally, other antennas may also be included.

The following describes each component of the terminal device in detail with reference to Figure 2:

The processor 110 may include one or more processing units. For example, the processor 110 may include an application processor (AP), a baseband processor, a graphics processing unit (GPU), and an image signal processor (image signal processor). signal processor, ISP, controller, memory, video codec, digital signal processor (digital signal processor, DSP), and/or neural network processor (neural-network processing unit, NPU), etc. Among them, the different processing units may be independent devices or integrated in one or more processors. Among them, the controller can be the nerve center and command center of the terminal device. The controller can generate operation control signals according to the instruction operation code and timing signals to complete the control of fetching instructions and executing instructions.

A memory may also be provided in the processor 110 to store instructions and data. In some embodiments, the memory in the processor 110 is a cache memory. The memory can store instructions or data that have just been used or recycled by the processor 110. If the processor 110 needs to use the instruction or data again, it can be directly called from the memory, thereby avoiding repeated access, reducing the waiting time of the processor 110, and improving the efficiency of the system.

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

The terminal device may also include a communication interface, which may be a transceiver module for communicating with other devices or communication networks, such as Ethernet, RAN, and wireless local area networks (WLAN). For example, the transceiver module may be a device such as a transceiver or a transceiver. Optionally, the communication interface may also be a transceiver circuit located in the processor to implement signal input and signal output of the processor.

The UART interface is a universal serial data bus used for asynchronous communication. The bus can be a two-way communication bus. It converts the data to be transmitted between serial communication and parallel communication. In some embodiments, the UART interface is generally used to connect the processor 110 and the wireless communication module 160. For example, the processor 110 communicates with the Bluetooth module in the wireless communication module 160 through the UART interface to realize the Bluetooth function. In some embodiments, the audio module 170 may transmit audio signals to the wireless communication module 160 through a UART interface, so as to realize the function of playing music through a Bluetooth headset.

It can be understood that the interface connection relationship between the modules illustrated in the embodiment of the present application is merely a schematic description, and does not constitute a structural limitation of the terminal device. In other embodiments of the present application, the terminal device may also adopt different interface connection modes in the foregoing embodiments, or a combination of multiple interface connection modes.

The wireless communication function of the terminal device can be realized by the antenna 1, the antenna 2, the mobile communication module 150, the wireless communication module 160, and the baseband processor.

The antenna 1 and the antenna 2 are used to transmit and receive electromagnetic wave signals. Each antenna in the terminal device can be used to cover a single or multiple communication frequency bands. Different antennas can also be reused to improve antenna utilization. For example: Antenna 1 can be multiplexed as a diversity antenna of a wireless local area network. In other embodiments, the antenna can be used in combination with a tuning switch.

The mobile communication module 150 can provide wireless communication solutions including 2G/3G/4G/5G, etc., which are applied to terminal devices. The mobile communication module 150 may include at least one filter, a switch, a power amplifier, a low noise amplifier (LNA), and the like. The mobile communication module 150 can receive electromagnetic waves by the antenna 1, and perform processing such as filtering, amplifying and transmitting the received electromagnetic waves to the baseband processor for demodulation. The mobile communication module 150 can also amplify the signal modulated by the baseband processor, and convert it into electromagnetic waves for radiation via the antenna 1. In some embodiments, at least part of the functional modules of the mobile communication module 150 may be provided in the processor 110. In some embodiments, at least part of the functional modules of the mobile communication module 150 and at least part of the modules of the processor 110 may be provided in the same device.

The baseband 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 and 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 the speaker 170A, the receiver 170B, etc.), or displays an image or video through the display screen 194. In some embodiments, the baseband processor may be an independent device. In other embodiments, the baseband processor may be independent of the processor 110 and be provided in the same device as the mobile communication module 150 or other functional modules.

The wireless communication module 160 can provide applications on terminal devices including wireless local area networks (WLAN) (such as wireless fidelity (Wi-Fi) networks), bluetooth (BT), and global navigation satellite systems. (global navigation satellite system, GNSS), frequency modulation (frequency modulation, FM), near field communication technology (near field communication, NFC), infrared technology (infrared, IR) and other wireless communication solutions. The wireless communication module 160 may be one or more devices integrating at least one communication processing module. The wireless communication module 160 receives electromagnetic waves via the antenna 2, frequency modulates and filters the electromagnetic wave signals, and sends the processed signals to the processor 110. The wireless communication module 160 may also receive a signal to be sent from the processor 110, perform frequency modulation, amplify, and convert it into electromagnetic waves to radiate through the antenna 2.

In some embodiments, the antenna 1 of the terminal device is coupled with the mobile communication module 150, and the antenna 2 is coupled with the wireless communication module 160, so that the terminal device can communicate with the network and other devices through wireless communication technology. The wireless communication technology may include long term evolution (LTE), BT, GNSS, WLAN, NFC, FM, and/or IR technologies. The GNSS may include global positioning system (GPS), global navigation satellite system (GLONASS), Beidou navigation satellite system (BDS), quasi-zenith satellite system (quasi- Zenith satellite system, QZSS) and/or satellite-based augmentation systems (SBAS).

The internal memory 121 may be used to store computer executable program code, where the executable program code includes instructions. The internal memory 121 may include a storage program area and a storage data area. Among them, the storage program area can store an operating system, an application program (such as a sound playback function, an image playback function, etc.) required by at least one function, and the like. The data storage area can store data (such as audio data, phone book, etc.) created during the use of the terminal device. 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 magnetic disk storage device, a flash memory device, a universal flash storage (UFS), and the like. The processor 110 executes various functional applications and data processing of the terminal device by running instructions stored in the internal memory 121 and/or instructions stored in a memory provided in the processor.

The SIM card interface 195 is used to connect to the SIM card. The SIM card can be inserted into the SIM card interface 195 or pulled out from the SIM card interface 195 to achieve contact and separation with the terminal device. The SIM card interface 195 can also be compatible with different types of SIM cards. The SIM card interface 195 may also be compatible with external memory cards. The terminal equipment interacts with the network through the SIM card to realize functions such as call and data communication.

It should be understood that the terminal device shown in FIG. 2 is only an example, and the terminal device may have more or fewer components than shown in the figure, may combine two or more components, or may have different The component configuration. The various components shown in the figure may be implemented in hardware, software, or a combination of hardware and software including one or more signal processing and/or application specific integrated circuits.

Based on the network architecture shown in Figure 1 above, when a non-independent networking solution is adopted, a 5G communication system and a 4G communication system can be deployed at the same time. The terminal device 103 can communicate with the network using the LTE-NR dual connection technology, that is, the terminal device 103 supports simultaneous access to a 4G base station and a 5G base station. For example, the RAN device 1011 is a 4G base station, and the RAN device 1012 is a 5G base station. Since the 4G communication system is also known as evolved universal terrestrial radio access (E-UTRA), this access method is called evolved universal terrestrial radio access and new air interface dual connection (E-UTRA NR dual connectivity, EN-DC). In the EN-DC mode, the 4G base station is the primary base station, and the 5G base station is the secondary base station. Of course, with the evolution of the system, it can also support the new air interface and the evolved universal land surface wireless access dual connectivity (NR E-UTRA dual connectivity in the future). , NE-DC), that is, the 4G base station is the secondary base station, and the 5G base station is the main base station.

Taking the EN-DC mode as an example, the CN can adopt an evolved packet core (EPC), and the CN device 102 can be a mobility management entity (MME) and a serving gateway (S-GW). )Wait. The terminal device 103 may have a control plane connection with the CN. On the control plane, the RAN device 1011 may receive control signaling from the CN device 102 (such as an MME), and control the terminal device 103 or the RAN device 1012 according to the control signaling. Among them, the control signaling can be a variety of possible signaling, which is not specifically limited.

In the downlink direction of the user plane, the RAN device 1011 can receive data from the core network and send the data to the terminal device 103, or send the data to the RAN device 1012 and the RAN device 1012 can send the data to the terminal device. 103. In the uplink direction of the user plane, the terminal device 103 can send data to the RAN device 1011, and the RAN device 1011 can send the data to the core network, or the terminal device 103 can send the data to the RAN device 1012, and the RAN device 1012 can send the data to The RAN device 1011, and then the RAN device 1011 sends the data to the core network.

Taking the above-mentioned non-independent networking solution in Figure 1 as an example, in low-speed application scenarios, using LTE-NR dual-connection technology for communication may have problems such as waste of network resources and high power consumption of terminal equipment. To solve this problem, in a possible solution, when the terminal device is connected to the 4G base station and the 5G base station through the LTE-NR dual connection technology, if the terminal device is in a low-speed application scenario, the terminal device and 4G can be released. Base station or 5G base station connection.

Among them, the low-speed application scenario refers to the application scenario where the terminal device has a low network demand, which can be specifically reflected in the low data transmission rate of the terminal device or the small size of the data packet that the terminal device needs to transmit. For example, when the terminal device detects any one or a combination of the following, it can determine that the terminal device is in a low-speed application scenario:

(1) The terminal device is in a bright screen state and running at a low network speed. Low network speed means that the data transmission rate of the terminal device is low. For example, it can specifically mean that the transmission rate of the terminal device for uplink data is less than the preset rate 1, for example, 50 kbit/s; it can also mean that the transmission rate of the terminal device for the downlink data is less than the preset rate. Set a rate of 2, for example, 60 kbit/s; it can also mean that the transmission rate of the terminal equipment for all data including uplink data and downlink data is less than a preset rate of 3, for example, 100 kbit/s. In practical applications, there are many scenarios where terminal devices operate at low network speeds, and the following three are exemplified. For example, the first type is to enable the function of running low-speed applications in the terminal device, and turn off the function of running high-speed applications. Low-speed applications refer to applications deployed in terminal equipment that require lower data transmission rates, such as requiring data transmission rates to be lower than the preset rate; the low-speed applications can be customized by the system or for users Manually customize the settings, such as camera, phone, SMS, memo and other applications. Conversely, high-speed applications refer to applications deployed in terminal devices that require higher data transmission rates. In the second type, the terminal device and other devices exchange heartbeat packets to maintain normal communication connections and so on. The third type is scenarios where the terminal device is operating at a low speed, such as game scenes or navigation scenes. This game scene requires higher CPU usage. The navigation Rate) requirements are relatively low.

(2) The terminal device is in the on-screen state, and the size of the data packet that the terminal device needs to transmit is less than or equal to the preset threshold. In the bright screen state, in order to meet the low-speed application scenarios, in addition to the data transmission rate, the terminal device can also consider the amount of data that the terminal device needs to transmit (that is, the size of the data packet that needs to be transmitted). consider. Among them, the size of the data packet that the terminal device needs to transmit can specifically refer to the size of all the data packets that the terminal device needs to transmit in the application (that is, the amount of data that needs to be transmitted), or it refers to the data packet that the terminal device needs to transmit per unit time. the size of.

(3) Turn off the mobile data communication function of the terminal device. Regardless of whether the UE is in any screen state (such as the on-screen state or off-screen state, etc.), when the UE cannot connect to the network (specifically, it can refer to disconnecting the UE’s mobile data communication function or mobile data connection function), it can be directly determined that the UE is in a low network Fast application scenarios. In other words, when the UE is in a disconnected state, it can be determined that the UE is in a low-speed application scenario. The disconnected state here may refer to only turning off the mobile data communication function of the UE, such as turning off the 2G, 3G, or 4G Internet access function of the UE, and retaining the data network (such as the telephone network, etc.) between the UE and the base station eNB.

(4) The overall temperature of the terminal device is greater than or equal to the preset temperature threshold. In practical applications, the overall temperature of the terminal device can usually be replaced by the temperature of some core components in the terminal device, such as CPU temperature, SOC temperature, and battery temperature.

(5) The terminal device is in the off-screen state and running at a low network speed. In this embodiment, there are also many scenarios where the terminal device is running at a low internet speed when the screen is off. For example, when the screen is off, it still supports the operation of background applications. At this time, in order to meet the needs of low network usage, you can turn on low internet speed application operation. The function of turning off the operation of high-speed applications. For another example, when the screen is off, the terminal device has no data to send or receive, or only transmits data packets that keep the application in the awake state, such as heartbeat test packets or monitoring data packets. This type of data packet is sent periodically, and the data packet The transmission rate and packet size are usually small. In this case, it can be considered that the terminal equipment is running at a low speed.

(6) The terminal device is in the off-screen state, and the size of the data packet that the terminal device needs to transmit is less than or equal to the second preset threshold.

Optionally, no matter which screen state the terminal device is in, when identifying the low-speed application scenario through the data transmission rate of the terminal device, in order to ensure the accuracy of the low-speed application scenario identification, the terminal device can also perform the data transmission rate. Further limit. For example, the terminal device will make statistics that the data transmission rate of the terminal device is less than or equal to the duration corresponding to the preset rate. If the duration exceeds a certain threshold, it can be determined that the terminal device is in a low-speed application scenario; otherwise, it is determined that the terminal device is not It is in a low-speed application scenario.

Optionally, in the case that LTE can meet the low-use network requirements of the terminal device (that is, LTE can meet the low-speed application scenario), the terminal device may preferentially disconnect the terminal device and the 5G base station. For example, when the terminal device is in the LTE-NR dual connection state, when the terminal device is in the off-screen state and the data transmission rate of the terminal device is less than or equal to the preset rate, the connection between the terminal device and the 5G base station is released.

After the terminal device disconnects the communication connection of any access network in the LTE-NR dual connection, if the terminal device is no longer in a low-speed application scenario (for example, migrate from a low-speed application scenario to a high-speed application scenario), you need to Resume LTE-NR dual-connection communication.

Among them, the high-speed application scenario refers to the application scenario where the terminal device has a high network demand, which can be specifically reflected in the high data transmission rate of the terminal device or the large size of the data packet that the terminal device needs to transmit. For example, when the terminal device detects any one or a combination of the following, it can determine that the terminal device is in a high-speed application scenario:

(1) The terminal device is in a bright screen state and is running at a high speed. High network speed means that the data transmission rate of the terminal equipment is higher. For example, it can specifically mean that the transmission rate of the terminal equipment for uplink data is greater than the preset rate 1, for example, 50 kbit/s; it can also mean that the transmission rate of the terminal equipment for the downlink data is greater than the preset rate. Set a rate of 2, for example, 60 kbit/s; it can also mean that the transmission rate of the terminal device for all data including uplink data and downlink data is greater than a preset rate of 3, for example, 100 kbit/s. In practical applications, there are many scenarios for terminal equipment to run at high speed. For example, the function of enabling high speed applications in terminal equipment. High speed applications refer to the deployment of terminal equipment that requires higher data transmission rates. The high-speed internet application can be customized by the system, or customized by the user according to personal preferences, such as music applications, video applications, internet-speed testing applications, application markets, etc.

(2) The terminal device is in a bright screen state, and the size of the data packet that the terminal device needs to transmit is greater than a preset threshold. In the bright screen state, in order to meet high network speed application scenarios, in addition to considering the data transmission rate, the terminal device can also determine the amount of data that the terminal device needs to transmit (that is, the size of the data packet that needs to be transmitted). consider.

It should be noted that the low-speed application scenario and the high-speed application scenario are two corresponding scenarios, and the descriptions of the two can be cross-referenced. In a possible implementation, the terminal device can seamlessly switch between the low-speed application scenario and the high-speed application scenario. For example, if the data transmission rate of the terminal device is less than or equal to the preset rate, it is in a low The network speed application scenario, if the data transmission rate of the terminal device is greater than the preset rate, it is in a high network speed application scenario. In another possible implementation manner, for example, if the data transmission rate of the terminal device is less than or equal to the second preset rate, it is in a low network speed application scenario, and if the data transmission rate of the terminal device is greater than the first preset rate, It is in a high network speed application scenario; wherein, the first preset rate may be greater than the second preset rate.

In the embodiments of this application, in a low-speed application scenario, the released communication connection is the connection between the terminal device and the 5G base station (ie, the secondary base station) (the terminal device and the 4G base station (ie, the primary base station) still maintain a communication connection) as an example , When the terminal device migrates to a high-speed application scenario, the connection between the terminal device and the 5G base station needs to be restored. In this case, the 4G base station needs to add the 4G base station to the terminal equipment after the secondary base station addition interval expires.

Specifically, after the terminal device establishes a connection with the 4G base station, the 4G base station can periodically start a timer for the terminal device. The duration of the timer is equal to the duration of the secondary base station adding interval, and the duration of the secondary base station adding interval can be pre-defined. Defined, for example, 60s.

For example, see Figure 3a, from the perspective of a 4G base station: at time t0, the 4G base station receives the RRC connection establishment request from the terminal device and establishes a connection with the terminal device; at time t1, the 4G base station is the terminal The device starts the timer for the first time. When the timer expires at t2, it can start the timer for the second time; when the timer expires at t3, it can start the timer for the third time; when the timer expires at t4, it can Start the timer for the fourth time; and so on.

From the perspective of the terminal device: at time t0, the terminal device sends an RRC connection establishment request to the 4G base station and establishes a connection with the 4G base station; further, the terminal device receives the secondary base station addition instruction sent by the 4G base station, and adds according to the secondary base station. Instruct to add a 5G base station as a secondary base station, that is, establish a connection with a 5G base station; at time T1, the terminal equipment is in a low-speed application scenario, and then releases the connection between the terminal equipment and the 5G base station; at time T2, the terminal equipment is applied from a low-speed network When the scenario is migrated to a high-speed application scenario, the connection between the terminal equipment and the 5G base station needs to be restored.

Going back to the 4G base station point of view again, at time T2, the 4G base station can learn that the connection between the terminal equipment and the 5G base station needs to be restored. For example, the 4G base station can learn that the terminal equipment needs to be restored according to the uplink and/or downlink data transmission rate of the terminal equipment. The connection with the 5G base station, or, it can also be learned that the connection between the terminal equipment and the 5G base station needs to be restored according to the signaling sent by the terminal equipment. However, since the timer has not expired at T2, the 4G base station needs to wait until the timer expires (that is, at t3) before it can perform related operations to restore the connection between the terminal equipment and the 5G base station. For example, at T3, the 4G base station sends the terminal to the terminal. The device sends a secondary base station addition instruction, and the terminal device adds a 5G base station as a secondary base station.

A possible implementation process is described below. Fig. 3b is a schematic diagram of the process of adding a secondary base station to a terminal device by a 4G base station. As shown in Fig. 3b, the process includes the following steps:

Step 301: The terminal equipment establishes a connection with a 4G base station and a 5G base station.

Step 302: The terminal device is in a low-speed application scenario, and the connection between the terminal device and the 5G base station is released.

In step 303, the 4G base station learns that a secondary base station needs to be added to the terminal device. For example, the 4G base station may learn that the connection between the terminal device and the 5G base station needs to be restored according to the uplink and/or downlink data transmission rate of the terminal device.

Step 304: The 4G base station determines whether the secondary base station addition interval has expired, and after the secondary base station addition interval expires, step 305 is executed.

Step 305: The 4G base station sends B1 measurement signaling to the terminal device, and the B1 measurement signaling is used to instruct the terminal device to measure the signal quality of the neighboring cell.

Step 306: The terminal device receives the B1 event measurement signaling, and sends a B1 event measurement report to the 4G base station.

Exemplarily, after receiving the B1 event measurement signaling, the terminal device can measure the 5G network signal of the neighboring cell according to the B1 event measurement signaling to obtain the 5G network signal quality of the neighboring cell. If the signal quality of the 5G network of the neighboring cell is higher than the signal quality threshold, the B1 event measurement report can be sent to the 4G base station.

Step 307: The 4G base station receives the B1 event measurement report, and selects a 5G neighboring cell that meets the conditions according to the B1 event measurement report.

Step 308: The 4G base station sends a secondary base station addition request (for example, SgNB Addition Request) to the 5G base station where the 5G neighboring cell is located.

Step 309: The 5G base station receives the secondary base station addition request, and sends a secondary base station addition response (such as SgNB Addition Response) to the 4G base station. Among them, the secondary base station addition response may be the secondary base station addition request acknowledgement (SgNB Addition Request ACK).

Step 310: The 4G base station receives the secondary base station addition response, and sends a secondary base station addition instruction to the terminal device.

In step 311, the terminal device receives the secondary base station addition instruction, and establishes a connection with the 5G base station according to the secondary base station addition instruction, that is, adds the 5G base station as the secondary base station, and then restores the dual connection.

It should be noted that the above description is based on the need to add a secondary base station due to the migration of terminal equipment from a low-speed application scenario to a high-speed application scenario. In other possible situations, it may also be due to other reasons that cause the need to add a secondary base station. , The specific is not limited.

However, when it is necessary to restore dual connections for the terminal equipment (for example, when a secondary base station needs to be added for the terminal equipment), 4G base stations need to wait for the secondary base station addition interval to expire before adding secondary base stations for the terminal equipment, which leads to the time when secondary base stations are added. The extension is larger. For example, taking a terminal device initiates a data service (that is, an increase in the data transmission rate) that leads to the need to add a secondary base station for the terminal as an example, the average delay from the terminal device initiating a data service to adding a secondary base station is 23.4s, and the maximum delay can reach 38s .

Based on this, an embodiment of the present application provides a method for restoring dual connections, which is used to reduce the delay of restoring dual connections and improve user experience.

The following first explains the relevant technical features involved in the embodiments of the present application. It should be noted that these explanations are for making the embodiments of the present application easier to understand, and should not be regarded as limiting the scope of protection required by the present application.

(1) Protocol layer structure

The communication between the terminal device and the base station can follow a certain protocol layer structure. For example, as shown in Figure 4a, the control plane protocol layer structure of the terminal device and the base station can include a radio resource control (RRC) layer and packet data aggregation. Protocol layers such as the packet data convergence protocol (PDCP) layer, radio link control (RLC) layer, media access control (MAC) layer, and physical layer (PHY) Function: The user plane protocol layer structure of the terminal equipment and the base station can include the functions of the PDCP layer, the RLC layer, the MAC layer, and the physical layer. Among them, the RRC layer, PDCP layer, RLC layer, MAC layer, and physical layer may also be collectively referred to as the access layer.

The terminal device also has an application layer and a non-access layer; the application layer can be used to provide services to applications installed in the terminal device. For example, the downlink data received by the terminal device can be sequentially transmitted from the physical layer to the application layer. In turn, the application layer is provided to the application program; for example, the application layer can obtain data generated by the application program (such as a video recorded by the user using the application program, etc.), and transmit the data to the physical layer in turn, and send it to other communication devices. The non-access layer can be used to forward user data, such as forwarding uplink data received from the application layer to the PDCP layer or forwarding downlink data received from the PDCP layer to the application layer.

Exemplarily, the terminal device may include an application processor and a baseband processor, where the application layer may be located in the application processor, and the non-access layer, RRC layer, PDCP layer, RLC layer, MAC layer, physical layer, etc. may be located in the application processor. In the baseband processor.

In addition, the terminal device can also communicate with a CN device (such as an MME). For example, the MME can include a non-access stratum, and the non-access stratum of the terminal device can communicate with the non-access stratum of the MME.

(2) The status of the terminal equipment

The state of the terminal device may include an RRC idle (RRC_IDLE) state and an RRC connected (RRC_CONNECTED) state. Among them, the RRC idle state can be referred to as the idle state for short, and the RRC connected state can be referred to as the connected state for short. The two states are described below.

Idle state: After the terminal device accesses the base station through the initial random access process, the base station can store the device parameters of the terminal device. If the terminal device does not communicate with the base station for a long time, the base station deletes the stored device parameters of the terminal device. When the terminal device is in the idle state. When in the idle state, there is no RRC connection between the terminal device and the base station, and the terminal device can perform cell selection and reselection, and tracking area update (TAU).

Connected state: After the terminal device is connected to the base station through the initial random access process, the device parameters of the terminal device can be stored in the base station. During this period, the terminal device can communicate with the base station, and the state of the terminal device at this time is the connected state .

(3) Service request process

When the terminal device is in the idle state and there is an uplink service initiation demand, the service request process can be triggered. Figure 4b is a schematic diagram of a possible service request process, as shown in Figure 4b, including the following steps:

Step 401: The non-access layer of the terminal device determines that it is currently in an idle state and there is a demand for initiating an uplink service.

Step 402: The non-access layer of the terminal device sends a service request to the RRC layer.

Step 403: The RRC layer of the terminal device triggers a random access process and sends a random access request to a base station (such as a 4G base station), and the base station can receive the random access request.

Step 404: The base station sends a random access response (RAR) to the terminal device, and the terminal device receives the random access response from the base station.

Step 405: The terminal device sends an RRC connection establishment request message to the base station, and the base station can receive the RRC connection establishment request message.

Step 406: The base station sends an RRC connection establishment message to the terminal device, and the terminal device can receive the RRC connection establishment message.

Step 407: The terminal device sends an RRC connection establishment complete message to the base station, and the RRC connection establishment complete message includes service request, and the base station can receive the RRC connection establishment complete message.

Step 408: The base station sends a service request of the non-access layer to the CN device for the CN device to establish a user plane data transmission channel for the terminal device.

Step 409: The CN device receives the service request, and establishes a user plane data transmission channel for the terminal device.

(4) Display the configuration strategy of network identification

The terminal device can display a network identifier in the status bar, such as a 4G network identifier or a 5G network identifier. There can be multiple configuration strategies for displaying the network identifier of the terminal device. The following describes four possible configuration strategies in conjunction with Table 1, which are config A, config B, config C, and config D.

Table 1: Examples of configuration strategies

状态state	config Aconfig A	config Bconfig B	config Cconfig C	config D config D

状态1State 1	4G 4G		4G4G		4G4G	4G4G
状态2State 2	4G 4G		4G4G		4G4G	5G5G
状态3State 3	4G 4G		4G4G		5G5G	5G5G
状态4State 4	4G 4G		5G5G		5G5G	5G5G
状态5State 5	5G 5G		5G5G		5G5G	5G5G
状态6State 6	5G 5G		5G5G		5G5G	5G5G

In Table 1, state 1 means that the terminal device is in the idle state or connected state in the LTE cell, and the LTE cell does not support NSA. In this state, the terminal device display adopts config A, config B, config C or config D When the time, the 4G network logo is displayed, as shown in (a) in Figure 5.

State 2 means that the terminal device is idle or connected in an LTE cell. The LTE cell supports NSA but the terminal device does not detect 5G network coverage. In this state, when the terminal device displays config A, config B or When config C, the 4G network identification is displayed, as shown in Figure 5 (a); when the display of the terminal device adopts config D, the 5G network identification is displayed, as shown in Figure 5 (b).

State 3 means that the terminal device is in an idle state or connected state in an LTE cell, the LTE cell supports NSA, and the terminal device detects 5G network coverage. In this state, when the terminal device displays config A or config B , Display the 4G network identification, as shown in Figure 5 (a); when the display of the terminal device adopts config C or config D, the 5G network identification is displayed, as shown in Figure 5 (b).

State 4 means that the terminal device is idle in the LTE cell, the LTE cell supports NSA and the terminal device detects 5G network coverage. In this state, when the display of the terminal device adopts config A, the 4G network identifier is displayed, such as As shown in (a) in Figure 5; when the display of the terminal device adopts config B, config C, or config D, the 5G network identifier is displayed, as shown in (b) in Figure 5.

State 5 means that the terminal device has connected to the LTE cell and the 5G cell at the same time. The LTE cell supports NSA. In this state, when the terminal device displays config A, config B, config C, or config D, the 5G network identification is displayed , As shown in Figure 5 (b).

State 6 means that the terminal device is attached to the 5G core network and is idle in the 5G wireless access network or the terminal device is connected to the 5G wireless access network. In this state, when the terminal device displays config A, config B. When config C or config D, the 5G network identifier is displayed, as shown in (b) in Figure 5.

Based on the foregoing description of related technical features, the technical solutions provided by the embodiments of the present application will be described in detail below in conjunction with Embodiment 1 and Embodiment 2.

In the following introduction process, the application of this method to the network architecture shown in FIG. 1 is taken as an example. In addition, the method can be executed by two communication devices, such as a first communication device and a second communication device, where the first communication device can be a 4G base station or can support the 4G base station to implement the functions required by the method. Of course, the communication device may also be other communication devices, such as a chip or a chip system. The second communication device may be a terminal device or a communication device capable of supporting the terminal device to implement the functions required by the method, and of course it may also be another communication device, such as a chip or a chip system. For ease of introduction, in the following, the method is executed by a 4G base station and terminal equipment as an example, that is, an example is taken that the first communication device is a 4G base station and the second communication device is a terminal device. If this embodiment is applied to the network architecture shown in FIG. 1, the 4G base station used to implement the embodiment shown in FIG. 6 or FIG. 7 described below may be the RAN device 1011 in the system architecture shown in FIG. 1. The terminal device described below for executing the embodiment shown in FIG. 6 or FIG. 7 may be the terminal device 103 in the system architecture shown in FIG. 1.

Example one

FIG. 6 is a schematic diagram of the process corresponding to the method for restoring dual connections provided in Embodiment 1 of the application, as shown in FIG. 6, including:

Step 601: The terminal device establishes a connection with a 4G base station and a 5G base station, where the 4G base station is the primary base station and the 5G base station is the secondary base station.

Step 602: When it is determined that the first preset condition is met, the terminal device releases the connection with the 5G base station.

Wherein, meeting the first preset condition may mean that the terminal device is in a low-speed application scenario. For example, meeting the first preset condition includes: the display screen of the terminal device is in an off-screen state, and the data transmission rate of the terminal device is less than or equal to the first 2. Preset rate.

When the terminal device releases the connection with the 5G base station, the terminal device will not be able to perform uplink and downlink services with the 5G base station, but can receive reference signals from the SCG. The reference signal is, for example, a synchronization signal block (SSB) or channel State information reference signal (channel state information-reference signal, CSI-RS), etc. Understandably, the terminal device releasing the connection with the 5G base station can also be described as the communication between the terminal device and the secondary base station being suspended.

Step 603: When it is determined that the second preset condition is met, the terminal device releases the connection with the 4G base station.

Wherein, meeting the second preset condition may mean that the terminal device is in a high-speed application scenario. For example, meeting the second preset condition includes: the display screen of the terminal device is in a bright screen state, and the data transmission rate of the terminal device is greater than the first preset condition. Set rate.

For example, after the application layer of the terminal device determines that the terminal device is switched from the off-screen state to the on-screen state, it can send the first signaling to the RRC layer of the terminal device, and then the RRC layer of the terminal device can release it after receiving the first signaling. Connection with 4G base station. For another example, after the application layer of the terminal device determines that the high-speed application is started, it can send the first signaling to the RRC layer of the terminal device. After receiving the first signaling, the RRC layer of the terminal device can release the connection with the 4G base station. connect.

Exemplarily, the first signaling may be used to indicate that the second preset condition is met, or it may also be said that it is used to indicate that a 5G base station needs to be added.

Step 604: The terminal device triggers a service request process, for example, the terminal device sends an RRC connection establishment request message to the 4G base station.

Exemplarily, after the RRC layer of the terminal device initiates the RRC release procedure, it may send second signaling to the non-access layer, where the second signaling is used to indicate that the connection with the 4G base station has been released. Correspondingly, after receiving the second signaling, the non-access layer can determine whether there is a data service. For example, if it is determined that there is an uplink service to be initiated, the service request process can be triggered, that is, the non-access layer of the terminal device sends a service request to the RRC layer. After receiving the service request, the RRC layer can send an RRC connection establishment request message to the terminal device. For the specific implementation of the service request process, please refer to the previous description. Wherein, the second signaling may carry a cause value, and the cause value is used to indicate that the reason for releasing the connection with the 4G base station is that a secondary base station needs to be added.

In an optional solution, after the non-access layer receives the second signaling, if it determines that there is no uplink service to be initiated, it can send a TAU request message to the MME through the 4G base station, and receive a TAU response message from the MME ; When the subsequent non-access layer determines that there is an uplink service to be initiated, the service request process can be triggered. The TAU request message may include an activation flag (active flag), which is used to indicate no bearer establishment request (No bearer establishment request), for example, active flag=0. Correspondingly, after receiving the TAU request message, the MME can update the state of the terminal device to an idle state, thereby effectively avoiding inconsistencies between the network side and the terminal device side and causing the network side to judge the state of the terminal device to be abnormal.

Step 605: The 4G base station receives the RRC connection establishment request message, and sends the RRC connection establishment message to the terminal device.

Step 606: The terminal device receives the RRC connection establishment message, and sends an RRC connection establishment complete message to the 4G base station.

Step 607: The 4G base station sends a capability request message to the terminal device. The capability request message is used to request capability information of the terminal device.

Step 608: The terminal device sends capability information to the 4G base station, where the capability information is used to indicate that the terminal device supports the LTE-NR dual connectivity technology.

Exemplarily, the capability information may also include information about the 5G frequency band supported by the terminal device.

Step 609: After receiving the capability information, the 4G base station determines the 5G measurement object according to the information of the 5G frequency band supported by the terminal device, and sends measurement signaling to the terminal device. The measurement signaling is used to instruct the terminal device to perform measurement based on the 5G measurement object.

Exemplarily, the measurement signaling may be B1 event measurement signaling.

Step 610: The terminal device performs measurement according to the measurement signaling, and reports the measurement result to the 4G base station.

Step 611: The 4G base station receives the measurement result reported by the terminal device, selects a 5G neighboring cell that meets the conditions according to the measurement result, and sends a secondary base station addition request to the 5G base station where the 5G neighboring cell is located.

Step 612: The 5G base station receives the secondary base station addition request, and sends a secondary base station addition response to the 4G base station. Among them, the secondary base station addition response may be the secondary base station addition request confirmation.

Step 613: The 4G base station receives the secondary base station addition response, and sends a secondary base station addition instruction to the terminal device.

Exemplarily, the 4G base station may send RRC connection reconfiguration information to the terminal device. The RRC connection reconfiguration message may include a secondary base station addition indication, which is used to indicate the radio resources used to establish a connection with the 5G base station.

Step 614: The terminal device receives the secondary base station addition instruction, and adds the 5G base station as the secondary base station according to the secondary base station addition instruction.

In the embodiment of this application, after the connection between the terminal device and the 5G base station is released, if it is determined that a 5G base station needs to be added, the connection between the terminal device and the 4G base station can be released; then, the terminal device triggers the service request process to restore the terminal device and 4G The base station connection and the connection between the terminal equipment and the 5G base station; thus, there is no need to wait for the time interval for adding the secondary base station to expire, which can effectively reduce the time delay of adding the secondary base station. In this way, although the release of the terminal equipment and the 4G base station will cause a temporary interruption of communication, the interruption time is short (such as 1s) and has little impact on the user experience; and because the terminal equipment and 4G base station and 5G base station can be quickly restored The connection can ensure the data traffic demand of the terminal equipment in time and improve the user experience.

Example two

FIG. 7 is a schematic flow diagram corresponding to the method for restoring dual connections provided in the second embodiment of the application, as shown in FIG. 7, including:

Step 701: The terminal device establishes a connection with a 4G base station and a 5G base station, where the 4G base station is the primary base station and the 5G base station is the secondary base station.

Step 702: When it is determined that the first preset condition is met, the terminal device releases the connection with the 5G base station.

Step 703: When it is determined that the second preset condition is met, the terminal device triggers an RRC connection re-establishment procedure. For example, the terminal device includes an RRC layer, and the RRC layer may send an RRC Connection Reestablishment Request message to the 4G base station.

In the existing solution, the terminal device can trigger the RRC connection re-establishment process for multiple reasons, such as handover failure, radio link failure, integrity protection failure, and RRC reconfiguration failure. In the embodiment of the present application, the terminal device may also trigger the RRC connection re-establishment process when it is determined that a secondary base station needs to be added.

Exemplarily, the RRC connection re-establishment request message may include the identification of the terminal device and the reason for triggering the RRC connection re-establishment procedure (reestablishment Cause). For example, if the terminal device triggers the RRC connection re-establishment process due to a handover failure, the reestablishment cause may be a handover failure (handoverFailure); in the embodiment of the application, the reason for the terminal device to trigger the RRC connection re-establishment process is that a secondary base station needs to be added. Then the reestablishment Cause can be other failure reasons (otherFailure).

Step 704: After receiving the RRC connection reestablishment request message, the 4G base station may send an RRC Connection Reestablishment (RRC Connection Reestablishment) message to the terminal device.

Step 705: The RRC layer of the terminal device sends an RRC Connection Reestablishment Complete (RRC Connection Reestablishment Complete) message to the 4G base station.

Step 706: After determining that the terminal device supports the LTE-NR dual connection technology according to the capability information of the terminal device, the 4G base station sends measurement signaling to the terminal device, and the measurement signaling is used to instruct the terminal device to measure 5G measurements.

Exemplarily, the 4G base station may store the capability information of the terminal device, and the capability information may be reported to the 4G base station after the terminal device establishes a connection with the 4G base station.

Step 707: The terminal device performs measurement according to the measurement signaling, and reports the measurement result to the 4G base station.

Step 708: The 4G base station receives the measurement result reported by the terminal device, selects a 5G neighboring cell that meets the conditions according to the measurement result, and sends a secondary base station addition request to the 5G base station where the 5G neighboring cell is located.

In step 709, the 5G base station receives the secondary base station addition request, and sends a secondary base station addition response to the 4G base station. Among them, the secondary base station addition response may be the secondary base station addition request confirmation.

Step 710: The 4G base station receives the secondary base station addition response, and sends a secondary base station addition instruction to the terminal device.

Step 711: The terminal device receives the secondary base station addition instruction, and adds the 5G base station as the secondary base station according to the secondary base station addition instruction.

With this solution, when the 4G base station of the terminal device is not released and the 5G base station is released, if a 5G base station needs to be added, the RRC connection re-establishment process can be initiated, and then the secondary base station can be added after the RRC connection re-establishment is completed. Therefore, there is no need to wait for the addition interval of the secondary base station to expire, which can effectively reduce the time delay of adding the secondary base station.

It should be noted that: (1) The step numbers of the flowcharts described in the embodiments of this application (for example, Figure 4b, Figure 6, and Figure 7) are only an example of the execution process, and do not constitute a sequence of steps. The order is restricted. In the embodiments of the present application, there is no strict execution order between steps that do not have a time sequence dependency relationship with each other.

(2) The difference between the first embodiment and the second embodiment is that in the first embodiment, the terminal device first releases the primary base station, and then adds the primary base station and the secondary base station, while in the second embodiment, it triggers the RRC connection re-establishment process for the terminal A secondary base station is added to the device. For other content except this difference, the two can refer to each other.

Exemplarily, when the dual connection is restored using the solution in Embodiment 1 or Embodiment 2, the network identification displayed in the status bar of the terminal device may change. The following takes the explicit use of config A of the terminal device as an example, and a description of a possible scenario uses the network identifier displayed in the status bar of the terminal device in the first embodiment.

Phase 1:

The user performs the operation of turning on the terminal device or turning off the flight mode. Correspondingly, after the terminal device receives the user’s turning on operation or turning off the flight mode, it can search the network, and after searching for the 4G network, perform the operation on the 4G network. Register. When the mobile phone completes the registration and accesses the 4G base station, the 4G network identifier is displayed in the status bar of the mobile phone, as shown in Figure 8 (a). Further, the 4G base station can add a secondary base station (5G base station) for the terminal device. After the secondary base station is successfully added, the 5G network identifier is displayed in the status bar of the mobile phone, as shown in Figure 8 (b).

When the terminal device is connected to the 4G base station and the 5G base station respectively, the user triggers the terminal device to start a high-speed application, such as a video application, and watch the video through the video application.

Phase 2:

After watching the video for a period of time, the user stops watching the video and sets the terminal device to the off-screen state. Correspondingly, after the terminal device detects that it is in the off-screen state and the data transmission rate is less than or equal to the second preset rate, the 5G base station can be released (the terminal device and the 4G base station still maintain an RRC connection, that is, the terminal device is in the connected state).

Subsequently, the user performs a bright screen operation on the terminal device. Correspondingly, the terminal device is in the bright screen state after receiving the bright screen operation. At this time, the 4G network logo is displayed in the status bar of the terminal device, as shown in Figure 8 (c) Show.

Phase 3:

The user triggers the terminal device to start the high-speed application again. Correspondingly, the application layer of the terminal device can send the first signaling to the RRC layer. After receiving the first signaling, the RRC layer can release the connection with the 4G base station (that is, the terminal device). In idle state). Furthermore, the terminal device triggers the service request process, restores the connection with the 4G base station (that is, the terminal device is in the connected state), and restores the connection with the 5G base station. At this time, the status bar of the terminal device displays the 5G network identifier, as shown in Figure 8 ( d) as shown in.

The foregoing mainly introduces the solution provided by the embodiment of the present application from the perspective of interaction between the terminal device and the network device. It can be understood that, in order to implement the above-mentioned functions, the terminal device may include corresponding hardware structures and/or software modules for performing various functions. Those skilled in the art should easily realize that in combination with the units and algorithm steps of the examples 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 certain function is executed by hardware or computer software-driven hardware depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.

The embodiment of the present application may divide the terminal device into functional units according to the foregoing method examples. For example, each functional unit may be divided corresponding to each function, or two or more functions may be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or software functional unit.

In the case of using an integrated unit, FIG. 9 shows a possible exemplary block diagram of a device involved in an embodiment of the present application. As shown in FIG. 9, the apparatus 900 may include: a processing unit 902 and a communication unit 903. The processing unit 902 is used to control and manage the actions of the device 900. The communication unit 903 is used to support communication between the apparatus 900 and other devices. Optionally, the communication unit 903 is also called a transceiving unit, and may include a receiving unit and/or a sending unit, which are used to perform receiving and sending operations, respectively. The device 900 may further include a storage unit 901 for storing program codes and/or data of the device 900.

The apparatus 900 may be the terminal device in any of the foregoing embodiments, or may also be a chip provided in the terminal device. The processing unit 902 may support the apparatus 900 to perform the actions of the terminal device in the foregoing method examples. Alternatively, the processing unit 902 mainly executes the internal actions of the terminal device in the method example, and the communication unit 903 can support communication between the apparatus 900 and the network device. For example, the communication unit 903 can be used to perform step 601, step 603, and step 604 in FIG. 6; and step 801, step 803, and step 805 in FIG. 8; the processing unit is used to perform step 602 in FIG. 6 and step 604 in FIG. 802.

Wherein, in one embodiment, the processing unit 902 is configured to connect the 4G base station and the 5G base station through the LTE-NR dual connection technology; and, when the first preset condition is met, release the connection with the 5G base station, so that all The terminal device communicates with the 4G base station; when the second preset condition is met, the connection with the 4G base station is released, so that the terminal device reconnects the 4G base station and the 5G base station through the LTE-NR dual connection technology.

In a possible design of this embodiment, the communication unit 903 is configured to send an RRC connection establishment request message to the 4G base station; Indicate establishing a connection with the 5G base station, and the secondary base station adding an indication is used to indicate radio resources used for establishing a connection with the 5G base station.

In another embodiment, the processing unit 902 is configured to connect the 4G base station and the 5G base station through the LTE-NR dual connection technology; when the first preset condition is met, release the connection with the 5G base station; and the communication unit 903 It is used to send an RRC connection re-establishment request message to the 4G base station when the first preset condition is met, so that the terminal device resumes the connection with the 5G base station.

It can be understood that the functions of each unit in the above-mentioned communication device 900 can be implemented with reference to the corresponding method embodiment. For example, the communication unit can be used to perform the sending and receiving of information in the above-mentioned method embodiment, which will not be repeated here.

FIG. 10 is a schematic structural diagram of a system chip provided by an embodiment of the application. As shown in FIG. 10, the system chip 1000 includes an application processor 1002 and a baseband processor 1004. Among them, the full name of the application processor is multimedia application processor (MAP), which refers to a very large-scale integrated circuit that has expanded audio and video functions and dedicated interfaces on the basis of a low-power central processing unit. Application processors are mainly divided into three categories, which can include comprehensive processors, multimedia processors, and single media processors. A comprehensive processor must not only have the functions of a multimedia application processor, but also be able to run complex operating systems such as Linux. The multimedia processor refers to a processor with more than two processing media, such as image, sound, video, and 3D. Graphics and other media. A single multimedia processor refers to a processor that processes one medium, and is usually only used to process images or sounds.

The baseband processor is an important component in the system chip, equivalent to a protocol processor, responsible for data processing and storage, mainly composed of digital signal processor, microcontroller and memory (such as flash, flash memory) and other units, its corresponding The main function is responsible for baseband coding or decoding, sound coding and speech coding, etc. Currently, baseband processors not only support multiple communication standards (such as GSM, LTE, CDMA, etc.), but also provide multimedia functions and provide communication interfaces for multimedia displays, image sensors, and audio equipment.

In actual applications, the software supported by the application processor includes operating systems, user interfaces, and application programs. The baseband processor can be regarded as a wireless modem (modem) module, which is responsible for coordinating and controlling the communication between the baseband processor and the base station and the application processor. The software that it supports can include baseband modem communication. Control software, etc.

The application processor and the baseband processor support the use of a preset interface technology to realize mutual communication. The interface technology can be customized by the system. For example, it includes but not limited to serial peripheral interface (SPI), Interface technologies such as universal asynchronous receiver/transmitter (UART), universal serial bus, and general purpose input/output (GPIO). Specifically, the application processor and the baseband processor can communicate with each other in a message format through control commands to complete functions such as calls, short messages, and mobile Internet access. The control commands may include traditional AT (attention) commands, mobile broadband interface model (MBIM) commands, or other protocol commands that support mutual transmission between the application processor and the baseband processor.

Optionally, as shown in FIG. 10, the baseband processor supports the operation of protocol software related to the non-access layer and the RRC layer. In practical applications, the application processor supports communication with the non-access layer and the RRC layer in the baseband processor. For example, the application processor in this application may use traditional AT commands to send corresponding signaling messages to the non-access layer to notify the non-access layer of information such as application status or device screen status that is currently known by the AP.

Optionally, the non-access stratum in the baseband processor supports the execution of the method steps described in any of the above-mentioned method embodiments in FIG. 6 to FIG. Other technical content. The RRC layer in the baseband processor supports the execution of the method steps described with the RRC layer as the execution subject in any of the method embodiments described in FIGS. 6-7 above, and/or other technical content described in this document.

In practical applications, the system chip 1000 usually refers to a highly complex system chip, such as an SOC chip. In actual deployment, it can be deployed inside the device or outside the device, and the device can be controlled through a wired connection or a wireless connection. The device includes, but is not limited to, a terminal device. For example, it may specifically include a smart phone, mobile internet devices (MID), wearable smart devices, or other devices that support network communication. Specifically, when the system chip 1000 is deployed inside the user equipment, the system chip 1000 is directly used to implement the method described in any of the method embodiments described in FIG. 5 to FIG. 9 above. When the system chip 1000 is deployed outside the user equipment and supports the establishment of communication between the system chip 1000 and the user equipment through a wired or wireless connection, the user equipment can call or control the system chip 1000 to implement any of the above Figures 6-7 The method described in the method embodiment.

By implementing the method in the embodiment of the present application, it is possible to solve the problems of long delay in restoring dual connections in the traditional technology and affecting user experience.

According to the method provided by the embodiments of the present application, the present application also provides a computer program product, the computer program product includes: computer program code, when the computer program code runs on a computer, the computer executes the steps shown in FIG. 6 or FIG. 8 The method of any one of the embodiments is shown.

According to the method provided by the embodiments of the present application, the present application also provides a computer-readable storage medium, the computer-readable medium stores program code, and when the program code runs on a computer, the computer executes FIG. 6 or FIG. 8 The method of any one of the illustrated embodiments.

According to the method provided in the embodiment of the present application, the present application also provides a system, which includes the aforementioned one or more terminal devices and one or more network devices.

In the embodiments of the present application, "at least one" refers to one or more, and "multiple" refers to two or more. "And/or" describes the association relationship of the associated objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A alone exists, A and B exist at the same time, and B exists alone, where A, B can be singular or plural. The character "/" generally indicates that the associated objects before and after are in an "or" relationship. "The following at least one item (a)" or similar expressions refers to any combination of these items, including any combination of a single item (a) or a plurality of items (a). For example, at least one item (a) of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple .

And, unless otherwise specified, the ordinal numbers such as "first" and "second" mentioned in the embodiments of this application are used to distinguish multiple objects, and are not used to limit the order, timing, priority, or importance of multiple objects. degree. For example, the first communication card and the second communication card are only for distinguishing different communication cards, but do not indicate the difference in priority or importance of the two communication cards.

Those skilled in the art should understand that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, this application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, this application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

This application is described with reference to flowcharts and/or block diagrams of methods, equipment (systems), and computer program products according to this application. It should be understood that each process and/or block in the flowchart and/or block diagram, and the combination of processes and/or blocks in the flowchart and/or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing equipment to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing equipment are generated It is a device that realizes the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing equipment to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction device. The device implements the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operation steps are executed on the computer or other programmable equipment to produce computer-implemented processing, so as to execute on the computer or other programmable equipment. The instructions provide steps for implementing the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

Obviously, those skilled in the art can make various changes and modifications to the application without departing from the spirit and scope of the application. In this way, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, then this application is also intended to include these modifications and variations.

Claims

A method for restoring dual connectivity, characterized in that the method includes:

Terminal equipment connects 4G base station and 5G base station through LTE-NR dual connection technology;

When the first preset condition is met, the terminal device releases the connection with the 5G base station, so that the terminal device communicates with the 4G base station;

When the second preset condition is met, the terminal device releases the connection with the 4G base station, so that the terminal device reconnects the 4G base station and the 5G base station through the LTE-NR dual connection technology.
The method according to claim 1, wherein the terminal device includes an RRC layer, and the terminal device reconnects a 4G base station and a 5G base station through LTE-NR dual connectivity technology, comprising:

The RRC layer sends an RRC connection establishment request message to the 4G base station, where the RRC connection establishment request message is used to request to establish a connection with the 4G base station;

The RRC layer receives a secondary base station addition instruction from the 4G base station, and establishes a connection with the 5G base station according to the secondary base station addition instruction. Wireless resources.
The method according to claim 1 or 2, wherein the terminal device includes an application layer and an RRC layer;

The terminal device releasing the connection with the 4G base station includes:

The application layer sends first signaling to the RRC layer, where the first signaling is used to indicate that the second preset condition is met;

After receiving the first signaling, the RRC layer releases the connection with the 4G base station.
The method according to any one of claims 1 to 3, wherein the terminal device includes a non-access layer and an RRC layer;

After releasing the connection with the 4G base station, the RRC layer sends a second signaling to the non-access layer, and the second signaling is used to indicate that the terminal device has released the connection with the 4G base station ；

After the non-access layer receives the second signaling, if it determines that there is a data service, it sends third signaling to the RRC layer, so that the RRC layer sends the third signaling to the RRC layer according to the third signaling. The 4G base station sends an RRC connection establishment request message.
The method according to claim 4, wherein the second signaling includes a cause value, and the cause value is used to indicate that the reason for releasing the connection with the 4G base station is that a secondary base station needs to be added.
The method according to any one of claims 1 to 5, wherein the terminal device includes a non-access layer, and after the terminal device releases the connection with the 4G base station, the method further includes:

The non-access layer sends a location update request to the core network device, where the location update request is used to indicate that the terminal device has released the connection with the 4G base station.
The method according to any one of claims 1 to 6, wherein the terminal device comprises a display screen;

The meeting the second preset condition includes:

The display screen is in a bright screen state, and the data transmission rate of the terminal device is greater than or equal to the first preset rate.
The method according to claim 7, wherein said meeting the first preset condition comprises:

The display screen is in the off-screen state, and the data transmission rate of the terminal device is less than or equal to the second preset rate.
A terminal device, characterized in that the terminal device includes a memory and at least one processor coupled with the memory; the memory is used for storing instructions, and the at least one processor is used for executing the instructions; When the at least one processor executes the instruction, the terminal device executes the following actions:

Connect 4G base stations and 5G base stations through LTE-NR dual connection technology;

When the first preset condition is met, release the connection with the 5G base station, so that the terminal device and the 4G base station can communicate;

When the second preset condition is met, the connection with the 4G base station is released, so that the terminal device connects the 4G base station and the 5G base station through the LTE-NR dual connection technology again.
The terminal device according to claim 9, wherein the terminal device further comprises an RRC layer;

The RRC layer is configured to, after releasing the connection with the 4G base station, send an RRC connection establishment request message to the 4G base station, where the RRC connection establishment request message is used to request the establishment of a connection with the 4G base station; and, Receive a secondary base station addition instruction from the 4G base station, and establish a connection with the 5G base station according to the secondary base station addition instruction, where the secondary base station addition instruction is used to indicate radio resources used to establish a connection with the 5G base station.
The terminal device according to claim 9 or 10, wherein the terminal device includes an application layer and an RRC layer;

The application layer is used to send first signaling to the RRC layer, where the first signaling is used to indicate that a second preset condition is met;

The RRC layer is used to release the connection with the 4G base station after receiving the first signaling.
The terminal device according to any one of claims 9 to 11, wherein the terminal device includes a non-access layer and an RRC layer;

The RRC layer is used to send second signaling to the non-access layer after the connection with the 4G base station is released, and the second signaling is used to indicate that the terminal device has released and the 4G Base station connection;

The non-access stratum is configured to, after receiving the second signaling, if it is determined that there is a data service, send third signaling to the RRC layer, so that the RRC layer can follow the third signaling Sending an RRC connection establishment request message to the 4G base station.
The terminal device according to claim 12, wherein the second signaling includes a cause value, and the cause value is used to indicate that the reason for releasing the connection with the 4G base station is that a secondary base station needs to be added.
The terminal device according to any one of claims 9 to 13, wherein the terminal device further comprises a non-access layer;

The non-access layer is used to send a location update request to the core network device after the terminal device releases the connection with the 4G base station, and the location update request is used to indicate that the terminal device has released and the 4G base station Connection.
The terminal device according to any one of claims 9 to 14, wherein the terminal device comprises a display screen;

The meeting the second preset condition includes:

The display screen is in a bright screen state, and the data transmission rate of the terminal device is greater than or equal to the first preset rate.
The terminal device according to claim 15, wherein said meeting the first preset condition comprises:

The display screen is in the off-screen state, and the data transmission rate of the terminal device is less than or equal to the second preset rate.
A system chip, characterized in that the system chip includes an application processor and a baseband processor;

The baseband processor is used to connect 4G base stations and 5G base stations through LTE-NR dual connection technology;

The application processor is configured to determine that the first preset condition is met;

The baseband processor is further configured to release the connection with the 5G base station when the application processor determines that the first preset condition is met;

The application processor is further configured to determine that the second preset condition is met;

The baseband processor is further configured to release the connection with the 4G base station when the application processor determines that the second preset condition is met, so that the baseband processor reconnects to the 4G through the LTE-NR dual connection technology Base stations and 5G base stations.
The system chip according to claim 17, wherein the baseband processor further comprises an RRC layer;

The RRC layer is configured to, after releasing the connection with the 4G base station, send an RRC connection establishment request message to the 4G base station, where the RRC connection establishment request message is used to request the establishment of a connection with the 4G base station; and, Receive a secondary base station addition instruction from the 4G base station, and establish a connection with the 5G base station according to the secondary base station addition instruction, where the secondary base station addition instruction is used to indicate radio resources used to establish a connection with the 5G base station.
The system chip according to claim 17 or 18, wherein the application processor includes an application layer, and the baseband processor includes an RRC layer;

The application layer is used to send first signaling to the RRC layer, where the first signaling is used to indicate that a second preset condition is met;

The RRC layer is used to release the connection with the 4G base station after receiving the first signaling.
The system chip according to any one of claims 17 to 19, wherein the baseband processor includes a non-access layer and an RRC layer;

The RRC layer is used to send second signaling to the non-access layer after the connection with the 4G base station is released, and the second signaling is used to indicate that the terminal device has released and the 4G Base station connection;

The non-access stratum is configured to, after receiving the second signaling, if it is determined that there is a data service, send third signaling to the RRC layer, so that the RRC layer can follow the third signaling Sending an RRC connection establishment request message to the 4G base station.
The system chip according to claim 20, wherein the second signaling includes a cause value, and the cause value is used to indicate that the reason for releasing the connection with the 4G base station is that a secondary base station needs to be added.
The system chip according to any one of claims 17 to 21, wherein the baseband processor further comprises a non-access layer;

The non-access stratum is used to send a location update request to the core network device after the baseband processor releases the connection with the 4G base station, and the location update request is used to indicate that the terminal device has been released and has been The connection of the 4G base station is described.
The system chip according to any one of claims 17 to 22, wherein the terminal device comprises a display screen;

The meeting the second preset condition includes:

The display screen is in a bright screen state, and the data transmission rate of the terminal device is greater than or equal to the first preset rate.
The system chip according to claim 23, wherein said meeting the first preset condition comprises:

The display screen is in the off-screen state, and the data transmission rate of the terminal device is less than or equal to the second preset rate.
A computer-readable storage medium, characterized by comprising a program, and when the program is executed by a processor, the method according to any one of claims 1 to 8 is executed.
A computer program product, characterized in that when a computer reads and executes the computer program product, the computer is caused to execute the method according to any one of claims 1 to 8.