Patent Publication Number: US-2022240137-A1

Title: Method and device for managing measurement parameters of cell handover

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. patent application Ser. No. 16/642,018 filed on Feb. 25, 2020, which is a national stage of International Application No. PCT/CN2017/099360 filed on Aug. 28, 2017. The disclosures of the above-referenced applications are hereby incorporated by reference in their entirety. 
    
    
     BACKGROUND 
     Along with technology development of drones, drones have played an important role in various fields, for example, aerial photography, express transportation, disaster relief and news report. After a drone accesses a cell and is in a connected state, if another cell is detected, and a signal of the another cell keeps being stronger than a signal of the presently-accessed cell by a threshold value within a preset time period (usually called TimeToTrigger), the drone performs cell handover processing and is handed over from the presently-accessed cell to the another cell. 
     SUMMARY 
     The present disclosure relates to the technical field of drones, and more specifically to a method and device for managing a measurement parameter for cell handover. 
     A network connection management method, device and system are provided in the present disclosure. 
     In a first aspect, a method for managing a measurement parameter for cell handover is provided, which may include operations as follows. 
     A target parameter is acquired in a flight process. The target parameter is a parameter varying with an altitude and configurable to indicate the altitude of an aerial vehicle. 
     A target measurement parameter for cell handover is determined according to the target parameter. 
     Cell handover processing is performed according to the target measurement parameter. 
     In some embodiments, the target parameter may include one or more of a parameter on an altitude value, a parameter on the number of detected cells other than a presently-accessed cell, a parameter on the number of detected cells, other than the presently-accessed cell and neighbor cells of the presently-accessed cell, and a parameter on an increase speed of the number of detected cells. 
     In some embodiments, the method may further include an operation as follows. 
     A first notification message sent by a base station is received. The first notification message is used to instruct the aerial vehicle to detect the target parameter. 
     In some embodiments, the operation that the target measurement parameter for cell handover is determined according to the target parameter may include operations as follows. 
     A target regulation factor corresponding to the currently-acquired target parameter is determined according to pre-stored correspondences between target parameters and regulation factors. 
     A product of the target regulation factor and a pre-stored reference measurement parameter for cell handover is acquired to obtain the target measurement parameter for cell handover. 
     In some embodiments, the method may further include operations as follows. 
     A second notification message sent by the base station is received. The second notification message contains the reference measurement parameter and the correspondences between the target parameters and the regulation factors. 
     The correspondences and the reference measurement parameter are stored. 
     In some embodiments, the measurement parameter may include a TimeToTrigger. 
     In a second aspect, an aerial vehicle is provided, which may include a detection module, a determination module and a handover module, 
     The detection module is configured to acquire a target parameter in a flight process. The target parameter is a parameter varying with an altitude and is able to indicate the altitude of the aerial vehicle. 
     The determination module is configured to determine a target measurement parameter for cell handover according to the target parameter. 
     The handover module is configured to perform cell handover processing according to the target measurement parameter. 
     In some embodiments, the target parameter may include one or more of a parameter on an altitude value, a parameter on the number of detected cells other than a presently-accessed cell, a parameter on the number of detected cells, other than the presently-accessed cell and neighbor cells of the presently-accessed cell, and a parameter on an increase speed of the number of detected cells. 
     In some embodiments, the aerial vehicle may further include a first receiving module. 
     The first receiving module is configured to receive a first notification message sent by a base station. The first notification message is used to instruct the aerial vehicle to detect the target parameter. 
     In some embodiments, the determination module may be configured to: 
     determine a target regulation factor corresponding to the currently-acquired target parameter according to pre-stored correspondences between target parameters and regulation factors; and 
     acquire a product of the target regulation factor and a pre-stored reference measurement parameter for cell handover to obtain the target measurement parameter for cell handover. 
     In some embodiments, the aerial vehicle may further include a second receiving module and a storage module. 
     The second receiving module is configured to receive a second notification message sent by the base station. The second notification message contains the reference measurement parameter and the correspondences between the target parameters and the regulation factors. 
     The storage module is configured to store the correspondences and the reference measurement parameter. 
     In some embodiments, the measurement parameter may include a TimeToTrigger. 
     In a third aspect, an aerial vehicle is provided, which may include a processor and a memory having at least one instruction stored thereon. The instruction may be loaded and executed by the processor to implement the method for managing a measurement parameter for cell handover in the first aspect. 
     In a fourth aspect, a computer-readable storage medium having at least one instruction stored thereon is provided. The instruction is loaded and executed by a processor to implement the method for managing measurement parameters for cell handover in the first aspect. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In order to describe the technical solutions in the embodiments of the present disclosure more clearly, the accompanying drawings required to be used for descriptions about the embodiments will be simply introduced below. It is apparent that the accompanying drawings described below only illustrate some embodiments of the present disclosure. Those skilled in the art may further obtain other accompanying drawings according to these accompanying drawings without creative work. 
         FIG. 1  is a flow chart showing a method for managing a measurement parameter for cell handover according to an embodiment of the present disclosure. 
         FIG. 2  is a flow chart showing a method for managing a measurement parameter for cell handover according to an embodiment of the present disclosure. 
         FIG. 3  is a schematic diagram illustrating a method for a managing measurement parameter for cell handover according to an embodiment of the present disclosure. 
         FIG. 4A  is a schematic diagram illustrating management for a measurement parameter for cell handover according to an embodiment of the present disclosure. 
         FIG. 4B  is a schematic diagram illustrating management for a measurement parameter for cell handover according to an embodiment of the present disclosure. 
         FIG. 4C  is a schematic diagram illustrating management for a measurement parameter for cell handover according to an embodiment of the present disclosure. 
         FIG. 5  is a flow chart showing a method for managing a measurement parameter for cell handover according to an embodiment of the present disclosure. 
         FIG. 6  is a flow chart showing a method for managing a measurement parameter for cell handover according to an embodiment of the present disclosure. 
         FIG. 7  is a schematic diagram illustrating management for a measurement parameter for cell handover according to an embodiment of the present disclosure. 
         FIG. 8  is a schematic diagram illustrating an aerial vehicle according to an embodiment of the present disclosure. 
         FIG. 9  is a schematic diagram illustrating an aerial vehicle according to an embodiment of the present disclosure. 
         FIG. 10  is a schematic diagram illustrating an aerial vehicle according to an embodiment of the present disclosure. 
         FIG. 11  is a structure diagram of an aerial vehicle according to an embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise represented. The implementations set forth in the following description of exemplary embodiments do not represent all implementations consistent with the present disclosure. Instead, they are merely examples of apparatuses and methods consistent with aspects related to the present disclosure as recited in the appended claims. 
     A method for managing a measurement parameter for cell handover is provided according to an exemplary embodiment of the present disclosure. The method may be implemented by an aerial vehicle. The aerial vehicle may be an unmanned helicopter, an unmanned airship and the like. 
     The aerial vehicle may include components such as a processor, a memory, a transceiver and a flight component. The processor may be a Central Processing Unit (CPU) and the like, and may be configured for related processing for calculation of a target measurement parameter. The transceiver may be configured to receive correspondences between target parameters and measurement parameters for cell handover sent by a base station and the like. The memory may be a Random Access Memory (RAM), a flash and the like, and may be configured to store received data, data required in a processing process, data generated in the processing process and the like, for example, the correspondences between the target parameters and the measurement parameters for cell handover. The flight component may include a motor, a propeller and the like. The motor is configured to provide flight power, and the propeller is configured to drive an airflow to implement flight of the aerial vehicle. 
     A method for managing a measurement parameter for cell handover is provided according to an embodiment of the present disclosure. As shown in  FIG. 1 , the method includes steps as follows. 
     In step  101 , a target parameter is acquired in a flight process. The target parameter is a parameter varying with an altitude and configurable to indicate the altitude of an aerial vehicle. 
     In some implementations, the aerial vehicle detects the target parameter in the flight process to acquire the target parameter, for subsequently determining a measurement parameter for cell handover. 
     In step  102 , a target measurement parameter for cell handover is determined according to the target parameter. 
     The measurement parameter for cell handover is used to determine cell handover. When a device (the aerial vehicle or another terminal) detects that signal strength of a cell meets a cell handover condition in a time period, and a duration of the time period reaches the measurement parameter, cell handover is performed. 
     In some implementations, the aerial vehicle, after acquiring the target parameter, determines the target measurement parameter for cell handover according to the target parameter. 
     In step  103 , cell handover processing is performed according to the target measurement parameter. 
     In some implementations, the aerial vehicle, after determining the target measurement parameter, judges whether the aerial vehicle is required to perform cell handover and performs related processing. 
     A method for managing a measurement parameter for cell handover is provided according to an embodiment of the present disclosure. A measurement parameter may be a TimeToTrigger, a Hysteresis parameter (Hys) or the like. The TimeToTrigger is taken as an example of the measurement parameter in the embodiment, to describe the solution in detail. The other cases for the method are similar to the case for the TimeToTrigger, and will not be described repeatedly in the embodiment anymore. As shown in  FIG. 2 , the method for managing a measurement parameter for cell handover may include the following steps. 
     In step  201 , a first notification message sent by a base station is received. The first notification message is used to instruct an aerial vehicle to detect a target parameter. 
     In some implementations, the base station may record in advance the target parameter which is to be detected by the aerial vehicle, and a parameter used as the target parameter may be pre-configured by a technician. After the aerial vehicle accesses the base station, the base station sends the first notification message to the aerial vehicle, as shown in  FIG. 3 , for example, Radio Resource Control (RRC) signaling. The first notification message instructs the aerial vehicle to detect the target parameter. The aerial vehicle, after receiving the first notification message, parses the first notification message to obtain the type of the target parameter to be detected by the aerial vehicle, and then the aerial vehicle may measure the target parameter to obtain the target parameter. 
     In step  202 , the target parameter is acquired in a flight process. The target parameter is a parameter varying with an altitude and configurable to indicate the altitude of the aerial vehicle. 
     In some implementations, when a user is intended to control the aerial vehicle to take off, the user may place the aerial vehicle stably, turn on a switch of the aerial vehicle, operate a remote controller to control the aerial vehicle to fly, and control a flight direction of the aerial vehicle. The aerial vehicle, after being turned on and receiving a signal of the base station, may further establish a connection with the base station. The aerial vehicle, after successfully accessing the base station, may detect the parameter at a preset detection period. Every time when the preset detection period is reached, the aerial vehicle may measure the target parameter, for subsequently determining the TimeToTrigger for cell handover. 
     In some embodiments, the target parameter may be one or more of a parameter on an altitude value, a parameter on the number of detected cells other than a presently-accessed cell, a parameter on the number of detected cells, other than the presently-accessed cell and neighbor cells thereof, and a parameter on an increase speed of the number of detected cells. 
     The parameter on the increase speed of the number of cells refers to an increment of the number of detected cells per altitude unit rise of the aerial vehicle. 
     In some implementations, the target parameter may be represented in many manners. 
     In a first condition that the target parameter is a parameter on an altitude value, the operation that the aerial vehicle detects the target parameter may include an operation as follows. The aerial vehicle may measure an altitude (in meters) at a present position through a laser ranging or 3 Dimensions (3D) Global Positioning System (GPS), as shown in  FIG. 4A , to obtain a value as the detected target parameter. 
     In a second condition that the target parameter is the parameter on the number of detected cells other than the presently-accessed cell, the operation that the aerial vehicle detects the target parameter may include an operation as follows. The base station may periodically broadcast a synchronization signal and a secondary synchronization signal to each cell. The synchronization signal and the secondary synchronization signal contain a cell identifier. Since signal coverage of different cells may overlap, signals of multiple cells may be detected by the aerial vehicle at the same time (within a relatively short preset time). The aerial vehicle acquires the cell identifier from each presently-detected signal, as shown in  FIG. 4B , and calculates the number of cell identifiers of cells other than the presently-accessed cell as the detected target parameter. Alternatively, when the number of cell identifiers is calculated, only the number of cell identifiers carried in messages having signal strength greater than a preset threshold value is calculated. 
     In a third condition that the target parameter is the parameter on the number of detected cells, other than the presently-accessed cell and the neighbor cells of the presently-accessed cell, the operation that aerial vehicle detects the target parameter may include operations as follows. A server may obtain the cell identifier acquired by the aerial vehicle from each presently-detected message according to a processing manner in the above second condition, then acquire a list of neighbor cells of the currently-accessed cell, compare all the cell identifiers detected by the aerial vehicle with cell identifies in the list of the neighbor cells, remove a cell identifier in the list of the neighbor cells and the cell identifier of the presently-accessed cell from all the cell identifiers, calculate the number of remaining cell identifiers as the detected target parameter. The list of neighbor cells of the currently-accessed cell may be pre-stored by the aerial vehicle, and may also be sent to the aerial vehicle by the base station and then received and stored by the aerial vehicle. 
     In a fourth condition that the target parameter is the parameter on an increase speed of the number of detected cells, the operation that the aerial vehicle detects the target parameter may include operations as follows. As shown in  FIG. 4C , the server may detect the altitude of the aerial vehicle according to a processing manner in the first condition. Every time when the aerial vehicle rises by a unit altitude, the aerial vehicle obtains the number of cells that may be detected at the same time in a processing manner similar to the above second condition, records the number of cells, and acquires the number of cells detected at the previous unit altitude, further calculates an increment of the number of cells after rising by the unit altitude, and divides the increment by the unit altitude to obtain an increase speed as the detected target parameter. 
     In the embodiment of the present disclosure, one or a combination of the above conditions may be used, that is, the target parameter may be any one or more of the above conditions. 
     In step  203 , a target TimeToTrigger for cell handover is determined according to the target parameter. 
     The TimeToTrigger for cell handover is configured to determine cell handover. When a device (the aerial vehicle or another terminal) detects that signal strength of a cell always meets a cell handover condition within a time period, and a duration of the time period reaches the TimeToTrigger, cell handover is performed. In correspondences, for the condition that the target parameter is the parameter on the altitude value, the TimeToTrigger increases with an increase of the altitude; in the condition that the target parameter is the parameter on the number of detected cells other than the presently-accessed cell, the TimeToTrigger increases with an increase of the number; for the condition that the target parameter is the parameter on the number of detected cells, other than the presently-accessed cell and the neighbor cells thereof, the TimeToTrigger increases with an increase of the number; and for the condition that the target parameter is the parameter on an increase speed of the number of detected cells, the TimeToTrigger increases with an increase of the increase speed. 
     In some embodiments, as shown in  FIG. 5 , the method includes step  203 ′, in which, a target regulation factor corresponding to the currently-acquired target parameter is determined according to pre-stored correspondences between target parameters and regulation factors; and a product of the target regulation factor and a pre-stored reference TimeToTrigger for cell handover is acquired to obtain the target TimeToTrigger for cell handover. 
     In some implementations, reference TimeToTrigger may be preset by the technician, or may be arbitrarily set based on a practical condition. For example, the reference TimeToTrigger may be set in consideration of a cell density. In addition, correspondences between the target parameters and the regulation factors may also be preset by the technician, and may be stored in form of a table. A value of the regulation factor may be arbitrarily set based on the practical condition, and may be set in consideration of the selected target parameter. 
     The reference TimeToTrigger and the correspondences table may be directly stored in a memory of the aerial vehicle, and may also be sent to the aerial vehicle by the base station and stored in the aerial vehicle. In the above correspondences, for the condition that the target parameter is the parameter on the altitude value, the regulation factor increases with an increase of the altitude; for the condition that the target parameter is the parameter on the number of detected cells other than the presently-accessed cell, the regulation factor increases with an increase of the number; for the condition that the target parameter is the parameter on the number of detected cells, other than the presently-accessed cell and the neighbor cells thereof, the regulation factor increases with an increase of the number; and for the condition that the target parameter is the parameter on the increase speed of the number of detected cells, the regulation factor increases with an increase of the increase speed. 
     The aerial vehicle, after detecting the target parameter, search the correspondence table for a regulation factor (i.e., the target regulation factor) corresponding to the value. The target regulation factor is multiplied by the reference TimeToTrigger to obtain a product as the target TimeToTigger. 
     For example, the preset reference TimeToTrigger is 1,024 ms, and the correspondence table of the target parameters and the regulation factors is shown in Table 1. 
     
       
         
           
               
               
               
             
               
                   
                 TABLE 1 
               
               
                   
                   
               
               
                   
                 Target parameter 
                 Regulation factor 
               
               
                   
                   
               
             
            
               
                   
                 100 
                 1 
               
               
                   
                 200 
                 2 
               
               
                   
                 300 
                 3 
               
               
                   
                 400 
                 4 
               
               
                   
                   
               
            
           
         
       
     
     When the target parameter is the parameter on the altitude value and the aerial vehicle detects that the altitude is 200 meters, it can be learned according to Table 1 that the regulation factor corresponding to the target parameter is 2 when the target parameter is 200 meters, and the regulation factor of 2 is multiplied by the reference TimeToTrigger 1,024 ms, 2×1024 ms=2048 ms, to obtain 2048 ms. Therefore, it may be learned that the target TimeToTrigger corresponding to the present position of the aerial vehicle is 2,048 ms. 
     In another example, the preset reference TimeToTrigger is 512 ms, and the correspondence table between the target parameters and the regulation factors is shown in Table 2. 
     
       
         
           
               
               
               
             
               
                   
                 TABLE 2 
               
               
                   
                   
               
               
                   
                 Target parameter 
                 Regulation factor 
               
               
                   
                   
               
             
            
               
                   
               
            
           
           
               
               
               
            
               
                   
                 5 
                 1 
               
               
                   
                 10 
                 2 
               
               
                   
                 15 
                 3 
               
               
                   
                 20 
                 4 
               
               
                   
                   
               
            
           
         
       
     
     When the target parameter is the parameter on the number of detected cells other than the presently-accessed cell and the aerial vehicle detects that the number of detected cells is 15, it may be learned according to Table 2 that the regulation factor corresponding to the target parameter is 3 when the target parameter is 15, and the regulation factor  3  is multiplied by the reference TimeToTrigger 512 ms, 3×512 ms=1536 ms, to obtain 1536 ms. Therefore, it may be learned that the target TimeToTrigger corresponding to the present position of the aerial vehicle is 1,536 ms. 
     In some embodiments, as shown in  FIG. 6 , the method further includes step  200 , in which, a second notification message sent by the base station is received, the second notification message contains the reference TimeToTrigger and the correspondences between the target parameters and the regulation factors, and the correspondences and the reference TimeToTrigger are stored. 
     The second notification message and the first notification message may be the same message, and may also be different messages. 
     In some implementations, correspondences between the target parameters and the regulation factors may be preset by the technician, and be stored in the base station in form of a table. In addition, the reference TimeToTrigger may also be preset by the technician, and be stored in the base station. When the aerial vehicle accesses the base station, the base station may send the second notification message to the aerial vehicle, the second notification message contains the correspondences and the reference TimeToTrigger. The aerial vehicle, after receiving the second notification message sent by the base station, stores the reference TimeToTrigger and the correspondences between the target parameters and the regulation factors and in the second notification message, for subsequently calculating the target TimeToTrigger. 
     In step  204 , cell handover processing is performed according to the target TimeToTrigger. 
     In some implementations, the aerial vehicle, after determining the target TimeToTrigger, stores the target TimeToTrigger. If the aerial vehicle detects that a difference between signal strength of a cell and signal strength of the presently-accessed cell is greater than a preset threshold value, and a duration in which the difference is kept greater than the preset threshold value reaches the target TimeToTrigger, a drone starts executing cell handover processing and is handed over from the presently-accessed cell to the cell having relatively high signal strength, as shown in  FIG. 7 . A value of the preset threshold value may range from 5 dBm to 20 dBm. For example, the preset threshold value is 10 dBm. 
     In the embodiment of the present disclosure, the target parameter is acquired, the target parameter is a parameter varying with the altitude and configurable to indicate the altitude of the aerial vehicle. The target TimeToTrigger for cell handover is determined according to the target parameter. Cell handover processing is performed according to the target TimeToTrigger. In such a manner, the drone may have different TimeToTrigger at different altitudes. Based on values set in the correspondences, a relatively long TimeToTrigger is obtained when the drone flies at a relatively high altitude, which avoids frequent cell handover, thereby reducing a failure rate of data transmission. 
     Based on the same inventive concept, an aerial vehicle is further provided according to an embodiment of the present disclosure. As shown in  FIG. 8 , the aerial vehicle includes a detection module  810 , a determination module  820  and a first storage module  830 . 
     The detection module  810  is configured to acquire a target parameter in a flight process. The target parameter is a parameter varying with an altitude and configurable to indicate the altitude of the aerial vehicle. 
     The determination module  820  is configured to determine a target TimeToTrigger for cell handover according to the target parameter. 
     The handover module  830  is configured to perform cell handover processing according to the target TimeToTrigger. 
     In some embodiments, the target parameter may include one or more of a parameter on an altitude value, a parameter on the number of detected cells other than a presently-accessed cell, a parameter on the number of detected cells, other than the presently-accessed cell and neighbor cells of the presently-accessed cell, and a parameter on an increase speed of the number of detected cells. 
     In some embodiments, the aerial vehicle further includes a first receiving module  910 . 
     The first receiving module  910  is configured to receive a first notification message sent by a base station. The first notification message is configured to instruct the aerial vehicle to detect the target parameter. 
     In some embodiments, the determination module  820  is configured to: 
     determine a target regulation factor corresponding to the currently-acquired target parameter according to pre-stored correspondences between target parameters and regulation factors; and 
     acquire a product of the target regulation factor and a pre-stored reference TimeToTrigger for cell handover to obtain the target TimeToTrigger for cell handover. 
     In some embodiments, the aerial vehicle further includes a second receiving module  1010  and a storage module  1020 . 
     The second receiving module  1010  is configured to receive a second notification message sent by the base station. The second notification message contains the reference TimeToTrigger and the correspondences between the target parameters and the regulation factors. 
     The storage module  1020  is configured to store the correspondences and the reference TimeToTrigger. 
     In some embodiments, a measurement parameter includes a TimeToTrigger. 
     In the embodiment of the present disclosure, the target parameter is acquired, the target parameter is a parameter varying with the altitude and configurable to indicate the altitude of the aerial vehicle. The target measurement parameter for cell handover is determined according to the target parameter. Cell handover processing is performed according to the target measurement parameter. In such a manner, the drone may have different measurement parameters at different altitudes. Based on values set in the correspondences, a relatively long measurement parameter is obtained when the drone flies at a high altitude, which avoids frequent cell handover, thereby reducing a failure rate of data transmission. 
     It is to be noted that, when managing the measurement parameter for cell handover, the aerial vehicle provided in the above embodiment is only exemplified with division of abovementioned functional modules, and during a practical application, the abovementioned functions may be allocated to be implemented by different functional modules according to a requirement. That is, an internal structure of a device is divided into different functional modules to implement all or a part of the functions described above. In addition, the aerial vehicle provided in the above embodiment has the same concept as the embodiment of the method for managing the measurement parameter for cell handover, and reference may be made to the method embodiment for details of an implementation process of the aerial vehicle, which is not described herein repeatedly anymore. 
     Another exemplary embodiment of the present disclosure illustrates a structure diagram of an aerial vehicle. The aerial vehicle may be a cellular network drone and the like. 
     Referring to  FIG. 11 , the aerial vehicle  1100  may include one or more of the following components: a processing component  1102 , a memory  1104 , a power component  1106 , a multimedia component  1108 , an audio component  1110 , an Input/Output (I/O) interface  1112 , a sensor component  1114 , a communication component  1116 , a positioning component  1118  and a flight component  1122 . 
     The processing component  1102  typically controls overall operations of the aerial vehicle  1100 , such as the operations associated with display, telephone calls, data communications, camera operations and recording operations. The processing component  1102  may include one or more processors  1120  to execute instructions to perform all or a part of the steps in the abovementioned method. Moreover, the processing component  1102  may include one or more modules which facilitate interaction between the processing component  1102  and the other components. For instance, the processing component  1102  may include a multimedia module to facilitate interaction between the multimedia component  1108  and the processing component  1102 . 
     The memory  1104  is configured to store various types of data to support the operation of the aerial vehicle  1100 . Examples of such data include address book data, phone book data, messages, pictures, videos or the like for any application programs or methods operated on the aerial vehicle  1100 . The memory  1104  may be implemented by any type of volatile or non-volatile memory devices, or a combination thereof, such as a static random access memory (SRAM), an electrically erasable programmable read-only memory (EEPROM), an erasable programmable read-only memory (EPROM), a programmable read-only memory (PROM), a read-only memory (ROM), a magnetic memory, a flash memory and a magnetic or optical disk. 
     The power supply component  1106  supplies power for various components of the aerial vehicle  1100 . The power supply component  1106  may include a power management system, one or more power supplies, and other components associated with generation, management and distribution of power for the aerial vehicle  1100 . 
     In some embodiments, the multimedia component  1108  includes a front camera and/or a rear camera. The front camera and/or the rear camera may receive external multimedia data when the aerial vehicle  1100  is in an operation mode, such as a photographing mode or a video mode. Each of the front camera and the rear camera may be a fixed optical lens system or have focusing and optical zooming capabilities. 
     The audio component  1110  is configured to output and/or input an audio signal. For example, the audio component  1110  includes a Microphone (MIC). The MIC is configured to receive an external audio signal when the audio output equipment  1100  is in the operation mode, such as a call mode, a recording mode and a voice recognition mode. The received audio signal may further be stored in the memory  1104  or sent through the communication component  1116 . 
     The I/O interface  1112  provides an interface between the processing component  1102  and a peripheral interface module, and the peripheral interface module may be a keyboard, a click wheel, a button and the like. The button may include, but be not limited to: a home button, a volume button, a starting button and a locking button. 
     The sensor component  1114  includes one or more sensors configured to provide status assessment in various aspects for the aerial vehicle  1100 . For instance, the sensor component  1114  may detect an on/off state of the aerial vehicle  1100  and relative positioning of components The components may be for example a display and small keyboard of the aerial vehicle  1100 , the sensor component  1114  may further detect a change in a position of the aerial vehicle  1100  or a component of the aerial vehicle  1100 , whether the user is in contact with the aerial vehicle  1100 , orientation or acceleration/deceleration of the aerial vehicle  1100  and a change in temperature of the aerial vehicle  1100 . The sensor component  1114  may include a proximity sensor configured to detect presence of a nearby object without any physical contact. The sensor component  1114  may also include a light sensor, such as a complementary metal oxide semiconductor (CMOS) or charge coupled device (CCD) image sensor, which is applied for imaging. In some embodiments, the sensor component  1114  may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor or a temperature sensor. 
     The communication component  1116  is configured to facilitate wired or wireless communication between the aerial vehicle  1100  and another device. The aerial vehicle  1100  may access a communication-standard-based wireless network, such as a Wireless Fidelity (Wi-Fi) network, a 2nd-Generation (2G), a 3rd-Generation (3G) network, a 4th-Generation (4G) network, a 5th-Generation (5G) network, or a combination thereof. In an exemplary embodiment, the communication component  1116  receives a broadcast signal or broadcasts associated information from an external broadcast management system through a broadcast channel. In an exemplary embodiment, the communication component  1116  further includes a Near Field Communication (NFC) module to facilitate short-range communication. For example, the NFC module may be implemented based on a Radio Frequency Identification (RFID) technology, an Infrared Data Association (IrDA) technology, an Ultra-WideBand (UWB) technology, a Bluetooth (BT) technology and another technology. 
     The positioning component  1118  is used by the aerial vehicle  1110  to determine position coordinates, and may be implemented by a GPS or a Beidou satellite positioning system. 
     The flight component  1122  may include a motor, a propeller and the like, and is configured to provide flight power for the aerial vehicle  1110 . 
     In an exemplary embodiment, the aerial vehicle  1100  may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors or other electronic components, to execute the abovementioned method. 
     In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is further provided, such as the memory  1104  including instructions. The instructions may be executed by the processor  1120  of the aerial vehicle  1100  to implement the abovementioned method. For example, the non-transitory computer-readable storage medium may be a ROM, a Random-Access Memory (RAM), a Compact Disc Read-Only Memory (CD-ROM), a magnetic tape, a floppy disc, an optical data storage device and the like. 
     A non-transitory computer-readable storage medium is provided according to yet another embodiment of the present disclosure. Instructions in the storage medium, when being executed by a processor of an aerial vehicle, enable the aerial vehicle to: 
     acquire a target parameter in a flight process, the target parameter is a parameter varying with an altitude and configurable to indicate the altitude of the aerial vehicle. 
     determine a target measurement parameter for cell handover according to the target parameter. 
     perform cell handover processing according to the target measurement parameter. 
     In some embodiments, the target parameter may include one or more of a parameter on an altitude value, a parameter on the number of detected cells other than a presently-accessed cell, a parameter on the number of detected cells, other than the presently-accessed cell and neighbor cells thereof, and a parameter on an increase speed of the number of detected cells. 
     In some embodiments, the method further includes enabling the device to: 
     receive a first notification message sent by a base station, the first notification message is used to instruct the aerial vehicle to detect the target parameter. 
     In some embodiments, the operation of determining the target measurement parameter for cell handover according to the target parameter includes operations of: 
     determining a target regulation factor corresponding to the currently-acquired target parameter according to pre-stored correspondences between target parameters and regulation factors; and 
     acquiring a product of the target regulation factor and a pre-stored reference measurement parameter for cell handover, to obtain the target measurement parameter for cell handover. 
     In some embodiments, the method further includes operations of: 
     receiving a second notification message sent by the base station, the second notification message contains the reference measurement parameter and the correspondences between the target parameters and the regulation factors; and 
     storing the correspondences and the reference measurement parameter. 
     In some embodiments, a measurement parameter includes a TimeToTrigger. 
     Various embodiments of the present disclosure can have one or more of the following advantages. 
     In the embodiments of the present disclosure, the target parameter is acquired, the target parameter is a parameter varying with the altitude and configurable to indicate the altitude of the aerial vehicle. The target measurement parameter for cell handover is determined according to the target parameter. Cell handover processing is performed according to the target measurement parameter. In such a manner, a drone may have different measurement parameters at different altitudes. For example, based on values set in the correspondences, a relatively long TimeToTrigger is obtained when the drone flies at a relatively high altitude, which avoids frequent cell handover, thereby reducing a failure rate of data transmission. 
     Those of ordinary skill in the art will recognize that all or a part of the steps for implementing the abovementioned embodiments may be implemented through hardware, and may also be implemented by instructing related hardware by a program. The program may be stored in a computer-readable storage medium. The storage medium may be a ROM, a magnetic disk, an optical disc or the like. 
     The foregoing is only one embodiment of the present disclosure and not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements and the like made within the spirit and principle of the present disclosure shall fall within the scope of protection of the present disclosure.