Cell handover control method, apparatus, device, medium and program product

Abstract

The application provides a cell switching control method, device, equipment, medium and program product, and relates to the technical field of communication, to solve the problem of low uplink service rate of a flight terminal in a low-altitude network. The method comprises the following steps: determining at least one target cell in a coverage air space corresponding to a predetermined route, wherein the signal quality of the target cell meets a preset condition, according to flight test results of the predetermined route, wherein the flight test results comprise signal quality detection data of the coverage air space corresponding to the predetermined route; changing a synchronization signal block (SSB) frequency point of the target cell to a target frequency point; and sending cell configuration information to a flight terminal flying on the predetermined route, wherein the cell configuration information is used to instruct the flight terminal to switch between cells corresponding to the target frequency point. The application can improve the uplink transmission service rate of the flight terminal during low-altitude route flight.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to a cell handover control method, apparatus, equipment, medium, and program product. Background Technology

[0002] In related technologies, to ensure ground coverage performance, terrestrial base stations set a certain downtilt angle for their antennas, with the antenna's back beam pointing towards the airspace. Current low-altitude network airspace testing reveals that low-altitude airspace exhibits numerous and complex wireless signals with high overlap. The signal-to-interference-plus-noise ratio (SINR), a measure of wireless signal quality at equal reference signal received power (RSRP) levels, is lower than that of terrestrial networks. Furthermore, frequent cell handovers in low-altitude airspace severely impact uplink service rates. Furthermore, the current low-altitude network handover strategy follows the model of the ground network. When a flight terminal on a low-altitude flight path receives a signal from a 5G base station at a relatively long distance on the ground, the measurement and control information sent by that base station is often directed to other 5G base stations in the surrounding ground environment. However, the target base station for handover is often not related to the 5G base station with a strong signal at the current location of the flight terminal on the low-altitude flight path. Therefore, the flight terminal may switch to a 5G cell that is not suitable for its current location and service needs, resulting in a low uplink service rate for the flight terminal in the low-altitude network. Summary of the Invention

[0003] This application provides a cell handover control method, apparatus, device, medium, and program product to solve the problem of low uplink service rates for related flight terminals in low-altitude networks.

[0004] To solve the above-mentioned technical problems, this application is implemented as follows:

[0005] In a first aspect, embodiments of this application provide a cell handover control method, applied to a network-side device, the method comprising:

[0006] Based on the flight test results on the predetermined route, at least one target cell in the coverage airspace corresponding to the predetermined route whose signal quality meets the preset conditions is determined. The flight test results include signal quality detection data of the coverage airspace corresponding to the predetermined route.

[0007] Change the SSB frequency point of the synchronization signal block of the target cell to the target frequency point;

[0008] Cell configuration information is sent to the flight terminal flying on the predetermined route. The cell configuration information is used to instruct the flight terminal to switch between cells corresponding to the target frequency.

[0009] Optionally, sending cell configuration information to the flight terminal flying on the predetermined route includes:

[0010] The inter-system inter-frequency selection priority (RFSP) index information corresponding to the target frequency point is determined, and the RFSP index information is sent to the flight terminal. The RFSP index information is used to indicate the target frequency point.

[0011] Optionally, changing the synchronization signal block (SSB) frequency point of the target cell to the target frequency point includes:

[0012] The SSB frequency of the target cell is changed to the target frequency by means of first configuration information, wherein the first configuration information includes the absolute frequency number NARFCN representing the target frequency;

[0013] Alternatively, the SSB frequency of the target cell can be changed to the target frequency using second configuration information, whereby the second configuration information includes the Global Synchronization Channel Number (GSCN) representing the target frequency.

[0014] Optionally, before determining, based on flight test results along the predetermined route, at least one target cell in the coverage airspace corresponding to the predetermined route whose signal quality meets preset conditions, the method further includes:

[0015] Based on the low-altitude service demand information, determine the coverage airspace of the low-altitude network to be tested;

[0016] The predetermined flight path is determined based on the airspace to be tested, and multiple flight test altitudes corresponding to the predetermined flight path are set.

[0017] Optionally, the flight test results are obtained in the following manner:

[0018] Using a flight test terminal, flight tests are conducted along the predetermined route at the multiple flight test altitudes to obtain the flight test results. The flight test results include signal quality detection information of multiple cells corresponding to the covered airspace, and the signal quality detection information includes signal-to-interference-plus-noise ratio (SINR) values.

[0019] The target cell is identified as the cell whose SINR value is greater than a preset threshold among the plurality of cells.

[0020] Optionally, after sending cell configuration information to the flight terminal flying on the predetermined route, the method further includes:

[0021] When the flight terminal is detected to be switching from the first cell to the second cell via the NG interface, a first handover request message carrying the RFSP index information is sent to the AMF through the source base station corresponding to the first cell, and a second handover request message carrying the RFSP index information is sent to the target base station corresponding to the second cell through the AMF, wherein the second cell is one of the at least one target cell;

[0022] Alternatively, if it is detected that the flight terminal has switched from the first cell to the second cell via the Xn interface, the RFSP index information is obtained from the AMF through the source base station corresponding to the first cell, and a second handover request message carrying the RFSP index information is sent to the target base station corresponding to the second cell.

[0023] Optionally, after sending cell configuration information to the flight terminal flying on the predetermined route, the method further includes:

[0024] The system receives a first message from the AMF carrying updated RFSP index information, which is sent to the AMF by the Unified Data Management (UDM) after modifying the RFSP index information.

[0025] Secondly, embodiments of this application provide a cell handover control method applied to a flight terminal, the method comprising:

[0026] The flight terminal receives cell configuration information sent by the network-side equipment, the cell configuration information being used to instruct the flight terminal to switch between cells corresponding to the target frequency point;

[0027] Cell handover is performed based on the cell configuration information, and the switched cell is one of the cells corresponding to the target frequency point.

[0028] Optionally, the cell configuration information received by the network-side device includes:

[0029] The network-side device receives RFSP index information, which is the RFSP index corresponding to the target frequency point, and the RFSP index information is used to indicate the target frequency point.

[0030] Thirdly, embodiments of this application provide a cell handover control device, applied to network-side equipment, the device comprising:

[0031] The first determining module is used to determine, based on the flight test results on the predetermined route, at least one target cell in the coverage airspace corresponding to the predetermined route whose signal quality meets preset conditions, wherein the flight test results include signal quality detection data of the coverage airspace corresponding to the predetermined route.

[0032] The module is used to change the synchronization signal block (SSB) frequency point of the target cell to the target frequency point;

[0033] The first transmitting module is used to transmit cell configuration information to a flight terminal flying on the predetermined route, the cell configuration information being used to instruct the flight terminal to switch between cells corresponding to the target frequency.

[0034] Optionally, the first transmitting module includes:

[0035] The determining unit is used to determine the inter-system inter-frequency selection priority (RFSP) index information corresponding to the target frequency point, and send the RFSP index information to the flight terminal. The RFSP index information is used to indicate the target frequency point.

[0036] Optionally, the modification module includes:

[0037] The first modification unit is configured to change the SSB frequency point of the target cell to the target frequency point through first configuration information, wherein the first configuration information includes the absolute frequency point number (NARFCN) representing the target frequency point;

[0038] Alternatively, the second modification unit is used to change the SSB frequency of the target cell to the target frequency using second configuration information, wherein the second configuration information includes the Global Synchronization Channel Number (GSCN) representing the target frequency.

[0039] Optionally, the device further includes:

[0040] The second determination module is used to determine the coverage airspace of the low-altitude network to be tested based on the low-altitude service demand information.

[0041] The third determining module is used to determine the predetermined route based on the airspace to be tested, and to set multiple flight test altitudes corresponding to the predetermined route.

[0042] Optionally, the flight test results are obtained in the following manner:

[0043] Using a flight test terminal, flight tests are conducted along the predetermined route at the multiple flight test altitudes to obtain the flight test results. The flight test results include signal quality detection information of multiple cells corresponding to the covered airspace, and the signal quality detection information includes signal-to-interference-plus-noise ratio (SINR) values.

[0044] The target cell is identified as the cell whose SINR value is greater than a preset threshold among the plurality of cells.

[0045] Optionally, the device further includes:

[0046] The second sending module is configured to, when detecting that the flight terminal has switched from the first cell to the second cell via the NG interface, send a first handover request message carrying the RFSP index information to the AMF through the source base station corresponding to the first cell, and send a second handover request message carrying the RFSP index information to the target base station corresponding to the second cell through the AMF, wherein the second cell is one of the at least one target cell;

[0047] Alternatively, the third sending module is configured to, upon detecting that the flight terminal has switched from the first cell to the second cell via the Xn interface, obtain the RFSP index information from the AMF through the source base station corresponding to the first cell, and send a second handover request message carrying the RFSP index information to the target base station corresponding to the second cell.

[0048] Optionally, the device further includes:

[0049] The second receiving module is used to receive a first message sent by the AMF carrying updated RFSP index information, wherein the updated RFSP index information is sent to the AMF by the Unified Data Management (UDM) after modifying the RFSP index information.

[0050] Fourthly, embodiments of this application provide a cell handover control device applied to a flight terminal, the device comprising:

[0051] The first receiving module is used to receive cell configuration information sent by the network-side device, wherein the cell configuration information is used to instruct the flight terminal to switch between cells corresponding to the target frequency point;

[0052] The handover module is used to perform cell handover according to the cell configuration information, and the cell after handover is one of the cells corresponding to the target frequency point.

[0053] Optionally, the first receiving module includes:

[0054] The receiving unit is configured to receive RFSP index information sent by the network-side device, wherein the RFSP index information is the RFSP index corresponding to the target frequency point, and the RFSP index information is used to indicate the target frequency point.

[0055] Fifthly, embodiments of this application provide a network-side device, including a transceiver and a processor, wherein the processor is used for:

[0056] Based on the flight test results on the predetermined route, at least one target cell in the coverage airspace corresponding to the predetermined route whose signal quality meets the preset conditions is determined. The flight test results include signal quality detection data of the coverage airspace corresponding to the predetermined route.

[0057] Change the SSB frequency point of the synchronization signal block of the target cell to the target frequency point;

[0058] The transceiver is used to send cell configuration information to a flight terminal flying on the predetermined route. The cell configuration information is used to instruct the flight terminal to switch between cells corresponding to the target frequency.

[0059] Optionally, the processor is specifically used for:

[0060] The inter-system inter-frequency selection priority (RFSP) index information corresponding to the target frequency point is determined, and the RFSP index information is sent to the flight terminal. The RFSP index information is used to indicate the target frequency point.

[0061] Optionally, the processor is specifically used for:

[0062] The SSB frequency of the target cell is changed to the target frequency by means of first configuration information, wherein the first configuration information includes the absolute frequency number NARFCN representing the target frequency;

[0063] Alternatively, the SSB frequency of the target cell can be changed to the target frequency using second configuration information, whereby the second configuration information includes the Global Synchronization Channel Number (GSCN) representing the target frequency.

[0064] Optionally, the processor is further configured to:

[0065] Based on the low-altitude service demand information, determine the coverage airspace of the low-altitude network to be tested;

[0066] The predetermined flight path is determined based on the airspace to be tested, and multiple flight test altitudes corresponding to the predetermined flight path are set.

[0067] Optionally, the flight test results are obtained in the following manner:

[0068] Using a flight test terminal, flight tests are conducted along the predetermined route at the multiple flight test altitudes to obtain the flight test results. The flight test results include signal quality detection information of multiple cells corresponding to the covered airspace, and the signal quality detection information includes signal-to-interference-plus-noise ratio (SINR) values.

[0069] The target cell is identified as the cell whose SINR value is greater than a preset threshold among the plurality of cells.

[0070] Optionally, the transceiver is further used for:

[0071] When the flight terminal is detected to be switching from the first cell to the second cell via the NG interface, a first handover request message carrying the RFSP index information is sent to the AMF through the source base station corresponding to the first cell, and a second handover request message carrying the RFSP index information is sent to the target base station corresponding to the second cell through the AMF, wherein the second cell is one of the at least one target cell;

[0072] Alternatively, if it is detected that the flight terminal has switched from the first cell to the second cell via the Xn interface, the RFSP index information is obtained from the AMF through the source base station corresponding to the first cell, and a second handover request message carrying the RFSP index information is sent to the target base station corresponding to the second cell.

[0073] Optionally, the transceiver is further used for:

[0074] The system receives a first message from the AMF carrying updated RFSP index information, which is sent to the AMF by the Unified Data Management (UDM) after modifying the RFSP index information.

[0075] Sixthly, embodiments of this application provide a flight terminal, including a transceiver and a processor:

[0076] The transceiver is used to receive cell configuration information sent by network-side equipment. The cell configuration information is used to instruct the flight terminal to switch between cells corresponding to the target frequency.

[0077] The processor is used to perform cell handover according to the cell configuration information, and the cell after handover is one of the cells corresponding to the target frequency point.

[0078] Optionally, the transceiver is specifically used for:

[0079] The network-side device receives RFSP index information, which is the RFSP index corresponding to the target frequency point, and the RFSP index information is used to indicate the target frequency point.

[0080] In a seventh aspect, embodiments of this application provide a communication device, including: a processor, a memory, and a program stored in the memory and executable on the processor, wherein when the program is executed by the processor, it implements the steps of the cell handover control method as described in the first aspect above; or, when the program is executed by the processor, it implements the steps of the cell handover control method as described in the second aspect above.

[0081] Eighthly, embodiments of this application provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the cell handover control method as described in the first aspect above; or, when executed by a processor, the computer program implements the steps of the cell handover control method as described in the second aspect above.

[0082] Ninthly, embodiments of this application provide a computer program product, including computer instructions, which, when executed by a processor, implement the steps of the cell handover control method as described in the first aspect above; or, when executed by a processor, the computer instructions implement the steps of the cell handover control method as described in the second aspect above.

[0083] In this embodiment, the cell handover control method determines at least one target cell in the coverage airspace corresponding to the predetermined route whose signal quality meets preset conditions based on flight test results on the predetermined route. The flight test results include signal quality detection data of the coverage airspace corresponding to the predetermined route. The method then changes the synchronization signal block (SSB) frequency of the target cell to the target frequency. Cell configuration information is sent to the flight terminal flying on the predetermined route, instructing the flight terminal to handover between cells corresponding to the target frequency. This allows the flight terminal to execute the handover strategy only between the target cells indicated by the cell configuration information during takeoff, low-altitude flight, and landing, without triggering handovers in other cells. This ensures signal quality during flight on the predetermined route and improves uplink transmission rates during low-altitude flight. Attached Figure Description

[0084] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0085] Figure 1 This is a schematic diagram of low-altitude network airspace coverage provided in an embodiment of this application;

[0086] Figure 2 This is one of the flowcharts of a cell handover control method provided in the embodiments of this application;

[0087] Figure 3 This is a schematic diagram of a low-altitude flight path provided in an embodiment of this application;

[0088] Figure 4This is a second flowchart of a cell handover control method provided in the embodiments of this application;

[0089] Figure 5 This is one of the structural schematic diagrams of a cell handover control device provided in the embodiments of this application;

[0090] Figure 6 This is a second schematic diagram of the structure of a cell handover control device provided in the embodiments of this application;

[0091] Figure 7 This is a schematic diagram of the structure of a network-side device provided in an embodiment of this application;

[0092] Figure 8 This is a schematic diagram of the structure of a flight terminal provided in an embodiment of this application. Detailed Implementation

[0093] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0094] For ease of understanding, the following describes some aspects of the embodiments of this application:

[0095] The application prospects of drones in flight terminals are broad, supporting solutions in many fields such as transportation, energy, and public utilities. It is one of the key areas for the development of next-generation information technology industries. The combination of drones and mobile communication technology forms networked drones. These networked drones, connected to low-altitude mobile communication networks, can achieve equipment monitoring and management, standardized flight routes, improved efficiency, reduced impact on general air routes, and promoted the rational use of airspace resources, possessing enormous economic value.

[0096] With the development of civilian drones, especially industrial drones, industry applications are placing increasingly higher demands on drone data links. A survey of six typical low-altitude network applications (including entertainment, inspection, monitoring, plant protection, logistics, and rescue) revealed that the industry's general requirements for communication links are: seamless coverage at 300m altitude, uplink bandwidth of 15-60Mbps, and flight control latency of 10ms. Different application scenarios have imposed strict requirements on uplink speeds, while the corresponding downlink speeds are actually lower than the uplink speeds.

[0097] Because most drones fly above their antennas, their wireless communication environment differs from that of ground users. When a drone flies below or near antenna height, its radio propagation characteristics are similar to those of ground users. When a drone flies above antenna height, the probability of line-of-sight propagation increases, uplink signals are received by more stations, and downlink signals from more stations can also be detected. This higher overlap in coverage leads to increased interference.

[0098] In addition, there is currently no dedicated low-altitude network for the low-altitude economy. The low-altitude network is mainly covered by wireless signals from ground base stations. Therefore, there is a significant "tower-top blackout" phenomenon in the low-altitude network. The ground 5G base stations received by low-altitude flight routes may come from relatively distant ground 5G base stations. Figure 1 This is a schematic diagram of low-altitude network airspace coverage provided in an embodiment of this application, such as... Figure 1 As shown, in low-altitude networks, the phenomenon of weak or even no signal in the area near the top of a base station tower is known as the "tower top blackout" phenomenon.

[0099] The drone received a large number of signals from neighboring areas in the air, with more than a dozen neighboring areas, causing a decrease in the average SINR. Actual signal quality measurements showed that the SSB SINR of the drone at low altitudes differed from the ground average by more than 10 dB, as shown in Table 1. For example, taking a 5% RSRP (Resonance to Reflection Point) as an example, the SINR value corresponding to an RSRP of -92 dBm on the ground is 8 dB, but at an altitude of 300 meters, the SINR value corresponding to an RSRP of -92 dBm is -2 dB. For the same RSRP, the SINR value at 300 meters low is 10 dB lower than that on the ground.

[0100] Table 1. Comparison of receiver signal level and quality between UAVs at low altitude and on the ground.

[0101]

[0102] The current handover strategy for low-altitude networks is consistent with that for ground networks.

[0103] The basic principles and mechanisms of connected-state mobility management in terrestrial 5G standalone (SA) networking scenarios, with detailed signaling procedures following the relevant requirements of the 3GPP protocol, and the basic handover process in SA networking scenarios are as follows:

[0104] (1) Switching function is started. The judgment describes the conditions for starting various switching functions.

[0105] The handover function activation determines whether the handover function switch has been turned on and whether the signal quality of the serving cell meets the requirements.

[0106] (2) Switching processing mode (blind mode or measurement mode).

[0107] After the handover function is initiated and the decision is approved, the gNodeB will select the corresponding processing mode based on the signal quality of the serving cell and related events.

[0108] Depending on whether the signal quality of the candidate target cell needs to be measured before the UE hands over, the processing mode is divided into measurement mode and blind mode.

[0109] Measurement mode: The process by which gNodeB instructs UE to measure and report the signal quality of candidate target cells based on the information issued by measurement control, and gNodeB generates a list of target cells based on the measurement reports reported by UE.

[0110] Blind mode: The process by which the gNodeB does not instruct the UE to measure the signal quality of candidate target cells, but directly generates a list of target cells or target frequencies based on relevant priority parameters.

[0111] (3) Description of the measurement control information sent by gNodeB to UE: the method and main content of the measurement configuration information sent by gNodeB.

[0112] Measurement control transmission refers to the process by which the gNodeB transmits measurement configuration information to the UE. The transmission of measurement configuration information by the gNodeB will be triggered in any of the following scenarios:

[0113] When the UE enters the connected state, the gNodeB will send measurement configuration information to the UE through RRC Reconfiguration.

[0114] After the UE is in connected mode or has completed a handover, if the measurement configuration information is updated, the gNodeB will also send the updated measurement configuration information to the UE via RRCReconfiguration. The measurement control sending described in this section is triggered in this scenario.

[0115] For events A1 to A6, the measurement system is NR.

[0116] If it is a B1 or B2 event, the measurement system is a non-NR system (e.g., E-UTRAN).

[0117] (4) Measurement report reporting description triggers the UE to report a measurement report to the gNodeB. The report configuration includes:

[0118] Measurement events: These include A1, A2, A3, A4, A5, A6, and B1 and B2. Different measurement events are used for different switching functions; details are provided in the respective switching function sections. For definitions, entry, and exit conditions of measurement events, please refer to the Measurement Events section.

[0119] Trigger quantity: refers to the strategy for triggering event reporting, such as RSRP, Reference Signal Received Quality (RSRQ), or SINR. For details, please refer to Trigger Quantity.

[0120] Each measurement event represents a signal quality state of the cell, as shown in Table 2.

[0121] Table 2 NR System Measurement Event Definitions

[0122]

[0123] (5) Target cell or target frequency decision describes the process by which gNodeB selects a handover strategy and generates a handover target cell or target frequency.

[0124] After receiving the measurement configuration information from the gNodeB, the UE performs the measurement according to the instructions, filters the measurement value according to the "filter coefficient", and then makes a decision on the event. Once the event entry condition is met, the UE will periodically report the measurement to the gNodeB.

[0125] The process of determining a target cell or target frequency includes the following three aspects:

[0126] First, the processing of measurement reports (only applicable in measurement mode):

[0127] The gNodeB processes the received measurement reports in a first-in-first-out (FIFO) manner (i.e., the first reported report is processed first) to generate candidate cells or candidate frequencies.

[0128] Second, determining the switching strategy:

[0129] The gNodeB determines the handover strategy based on candidate cell or candidate frequency information, the UE's current service type, and the UE's capabilities. The handover strategy includes:

[0130] Handover: When handover is described as a handover strategy, it refers to the process by which the gNodeB changes the UE from the original serving cell to the target cell without initiating an RRC connection release, thus ensuring service continuity.

[0131] Redirection: refers to the process by which the gNodeB directly initiates an RRC connection release to the UE and instructs the UE to select a cell for access at a certain frequency.

[0132] Third, the generation of the target cell or target frequency:

[0133] (6) Handover execution description: The process of the UE and gNodeB performing handover according to the handover policy.

[0134] Currently, the handover strategy for low-altitude networks is consistent with that of ground networks, which has serious shortcomings, such as... Figure 1 As shown, the 5G signal received by the drone on the low-altitude flight path may come from a 5G base station that is far away on the ground. The measurement and control signals sent by the 5G base station are directed to 5G base stations around the base station on the ground, which are not related to the strong 5G base station signal at the location of the drone on the low-altitude flight path. Therefore, the drone on the low-altitude flight path may switch to an unreasonable 5G cell, thereby affecting the uplink service rate of the low-altitude network.

[0135] In this application embodiment, a cell handover control method, device, equipment, medium, and program product are proposed to solve the problem of low uplink service rates for related flight terminals in low-altitude networks.

[0136] See Figure 2 , Figure 2 This is one of the flowcharts of a cell handover control method provided in the embodiments of this application, applied to network-side equipment, such as... Figure 2 As shown, the method includes the following steps:

[0137] Step 201: Based on the flight test results on the predetermined route, determine at least one target cell in the coverage airspace corresponding to the predetermined route whose signal quality meets preset conditions. The flight test results include signal quality detection data of the coverage airspace corresponding to the predetermined route.

[0138] In this step, the aforementioned predetermined route can be the specific path that the flight terminal plans to fly, and the aforementioned flight test results can be data collected through actual flight experiments by the flight terminal, which may include parameters such as signal strength and interference level at different locations.

[0139] The aforementioned coverage airspace can be understood as the spatial range that the signals of network-side devices, such as base stations, can effectively cover, and is associated with the predetermined flight path. The aforementioned signal quality refers to the degree to which the wireless signals received by the flight terminal meet communication requirements; specifically, it can be determined by a single key parameter or obtained through a comprehensive evaluation of multiple key parameters. The aforementioned target cell can be the service area of ​​a base station within the coverage airspace whose signal quality meets the requirements, for example, an RSRP greater than a preset threshold.

[0140] The aforementioned signal quality detection data can be the results of measuring wireless signal parameters within the covered airspace during actual flight tests on a predetermined route, and may include SINR, RSRP, bit error rate (BLER), etc.

[0141] Step 202: Change the SSB frequency point of the target cell to the target frequency point.

[0142] In this step, the target frequency can be a specific frequency or a set of frequencies that are predefined or dynamically selected.

[0143] It should be noted that the frequency of a cell in an NR system can be defined by the SSB frequency. In an NR system, the Primary Synchronization Signal (PSS), Secondary Synchronization Signal (SSS), and Physical Broadcast Channel (PBCH) together constitute a Synchronization Signal and PBCH block (SSB), and each SSB consists of 240 consecutive subcarriers. The UE performs cell search by receiving PSS and SSS signals and obtains necessary information by receiving broadcast system messages, thereby performing cell selection and camping.

[0144] It is understood that changing the SSB frequency of the target cell to the target frequency means modifying the SSB frequency configuration of the target cell so that it operates on the preset target frequency, thereby enabling the formation of a "different frequency low-altitude private network" that is different from the ground network.

[0145] Step 203: Send cell configuration information to the flight terminal flying on the predetermined route. The cell configuration information is used to instruct the flight terminal to switch between cells corresponding to the target frequency.

[0146] In this step, the aforementioned flight terminal can be an airborne mobile device that relies on wireless communication, such as a drone or aerial photography equipment. The cell configuration information may include a target frequency list and handover policies, used to instruct the flight terminal to handover only between cells corresponding to the target frequency.

[0147] In this embodiment, the cell handover control method determines at least one target cell in the coverage airspace corresponding to the predetermined route whose signal quality meets preset conditions based on flight test results on the predetermined route. The flight test results include signal quality detection data of the coverage airspace corresponding to the predetermined route. The method then changes the synchronization signal block (SSB) frequency of the target cell to the target frequency. Cell configuration information is sent to the flight terminal flying on the predetermined route, instructing the flight terminal to handover between cells corresponding to the target frequency. This allows the flight terminal to execute the handover strategy only between the target cells indicated by the cell configuration information during takeoff, low-altitude flight, and landing, without triggering handovers in other cells. This ensures signal quality during flight on the predetermined route and improves uplink transmission rates during low-altitude flight.

[0148] Optionally, sending cell configuration information to the flight terminal flying on the predetermined route includes:

[0149] The inter-system inter-frequency selection priority (RFSP) index information corresponding to the target frequency point is determined, and the RFSP index information is sent to the flight terminal. The RFSP index information is used to indicate the target frequency point.

[0150] Specifically, the aforementioned RFSP index information can be codes or parameters used to identify frequency point priorities, and the flight terminal can identify the target frequency point through the RFSP index information.

[0151] It should be noted that in a wireless network, if all UEs under the same gNodeB apply the same Radio Resource Management (RRM) policy, the requirements of UEs with different services cannot be met. In order to support providing UEs with specific RRM policies, NR introduced the concept of Inter-system Inter-frequency Selection Priority (RAT / RFSP). RFSP is a policy index in the range of 1 to 256 that the operator registers for the UE in the Unified Data Management (UDM) database.

[0152] For SA network users, the Access and Mobility Management Function (AMF) passes the RFSP index to the gNodeB through the NG interface. After the gNodeB maps the index to its local configuration, it can provide specific RRM policies for the UE based on the index, so as to better provide targeted services according to the UE's service characteristics and load status.

[0153] For example, RFSP index 0 (RFSP=0) is bound to frequency point list group 0, i.e. SSB frequency domain position F1; RFSP index 1 (RFSP=1) is bound to frequency point list group 1, i.e. SSB frequency domain position F3, as shown in Table 3.

[0154] Table 3. Correspondence between RFSP index and frequency point list group

[0155]

[0156] Understandably, the RFSP function primarily specifies the handover of a particular UE to NR cells on certain specific frequencies within the NR system. In low-altitude networks, due to the abundance of 5G cells and severe overlap in coverage, handovers are frequent and sometimes unreasonable. To ensure the continuity of low-altitude economic services, controlling the drone UE to only trigger handovers to NR cells on specific frequencies can guarantee a high handover success rate and improve uplink transmission rates.

[0157] The gNodeB obtains the UE's RFSP index from the core network. Based on the obtained RFSP index, the gNodeB binds the UE's RFSP index with the set gNodeB frequency point priority group to generate a dedicated RFSP frequency point list. The main parameters of the gNodeB frequency point priority group are shown in Table 4.

[0158] Table 4 Parameters of gNodeB Frequency Priority Group

[0159]

[0160] For example, the configuration of the gNodeB frequency priority group is shown in Table 5.

[0161] Table 5 Examples of gNodeB Frequency Priority Group Configuration

[0162]

[0163] In this embodiment, by determining the inter-system inter-frequency selection priority (RFSP) index information corresponding to the target frequency point, the RFSP index information is sent to the flight terminal. The RFSP index information is used to indicate the target frequency point, so that the terminal can determine the target frequency point according to the RFSP index information and then switch to the cell corresponding to the target frequency point. This can avoid the flight terminal switching to an unreasonable cell, which would affect the uplink transmission service rate of the flight terminal during low-altitude flight. It can also simplify the frequency point selection logic of the flight terminal and reduce communication latency.

[0164] Optionally, changing the synchronization signal block (SSB) frequency point of the target cell to the target frequency point includes:

[0165] The SSB frequency of the target cell is changed to the target frequency by means of first configuration information, wherein the first configuration information includes the absolute frequency number NARFCN representing the target frequency;

[0166] Alternatively, the SSB frequency of the target cell can be changed to the target frequency using second configuration information, whereby the second configuration information includes the Global Synchronization Channel Number (GSCN) representing the target frequency.

[0167] It should be noted that the SSB frequency domain location can be described in the following two ways:

[0168] I. Using the Absolute Frequency Number (NARFCN) method for description:

[0169] Configure NRDUCell.SsbDescMethod to "SSB_DESC_TYPE_NARFCN". In this case, NRDUCell.SsbFreqPos represents the NARFCN corresponding to the center frequency of the SSB.

[0170] II. Using the Global Synchronization Channel Number (GSCN) method for description:

[0171] Configure NRDUCell.SsbDescMethod to "SSB_DESC_TYPE_GSCN". In this case, NRDUCell.SsbFreqPos represents the GSCN corresponding to the SSB center frequency. The correspondence between GSCN and frequency is shown in Table 6. For a detailed description, please refer to the relevant content in the 3GPP protocol.

[0172] Table 6. Correspondence between GSCN and frequency

[0173]

[0174] In this implementation, the SSB frequency of the target cell can be dynamically adjusted using the absolute frequency point number NARFCN or the global synchronization channel number GSCN, enabling the flight terminal to quickly lock onto the synchronization signal of the target cell, thereby improving connection speed and stability.

[0175] Optionally, before determining, based on flight test results along the predetermined route, at least one target cell in the coverage airspace corresponding to the predetermined route whose signal quality meets preset conditions, the method further includes:

[0176] Based on the low-altitude service demand information, determine the coverage airspace of the low-altitude network to be tested;

[0177] The predetermined flight path is determined based on the airspace to be tested, and multiple flight test altitudes corresponding to the predetermined flight path are set.

[0178] Specifically, the aforementioned low-altitude service requirements information can be the requirements of a particular application scenario for low-altitude network communication capabilities. For example, the low-altitude service requirements information may require that drone delivery services be carried out in a certain area, ensuring continuous coverage at an altitude of 50-200 meters and supporting an upload bandwidth of 10 Mbps.

[0179] The coverage airspace to be tested for the aforementioned low-altitude network can be a three-dimensional spatial region defined based on the low-altitude service demand information, including geographical range and vertical height.

[0180] The specific process of determining the predetermined route based on the airspace to be tested can be as follows: by collecting electronic maps used for low-altitude network routes, and using the various network maps and editing functions provided by the electronic map software, vector maps and station information of low-altitude routes are created. Route names are created in the low-altitude route list, and low-altitude route information is created by creating or inserting low-altitude route information. The general outline of the low-altitude route is locked, and vector points are added manually or by inserting using network map tools to complete the drawing of the low-altitude route information.

[0181] For example, Figure 3 This is a schematic diagram of a low-altitude flight path provided in an embodiment of this application, such as... Figure 3 As shown, the starting point and landing point of the predetermined route can be set to the same point, or the starting point and landing point of the predetermined route can be set to different points.

[0182] The aforementioned flight test altitudes can be ground-level altitudes set based on low-altitude service requirements to simulate signal coverage under different application scenarios, such as 120 meters, 200 meters, and 300 meters.

[0183] In this implementation, by determining the coverage airspace to be tested for the low-altitude network based on low-altitude service demand information, determining the predetermined flight route based on the coverage airspace to be tested, and setting multiple flight test altitudes corresponding to the predetermined flight route, it is possible to ensure that the network deployment is highly matched with the low-altitude economic service demand, thereby significantly improving resource utilization efficiency and user experience.

[0184] Optionally, the flight test results are obtained in the following manner:

[0185] Using a flight test terminal, flight tests are conducted along the predetermined route at the multiple flight test altitudes to obtain the flight test results. The flight test results include signal quality detection information of multiple cells corresponding to the covered airspace, and the signal quality detection information includes signal-to-interference-plus-noise ratio (SINR) values.

[0186] The target cell is identified as the cell whose SINR value is greater than a preset threshold among the plurality of cells.

[0187] Specifically, the aforementioned flight test terminal can be a flight terminal equipped with a communication module (such as a base station simulator or dedicated test equipment) for real-time acquisition of signal quality data at predetermined routes and altitudes, such as a flight terminal carrying test instruments.

[0188] The aforementioned preset threshold can be the minimum acceptable signal quality index set according to business needs, or it can be adjusted according to actual conditions and flight test results.

[0189] For example, the flight test results for a certain predetermined route are shown in Table 3. The average RSRP value is not weak, at -87.67 dBm, but the average SINR value is only 1.94 dB. The proportion of SINR greater than -3 dB is only 68.85%. It can be seen that the main problem of low-altitude networks is poor wireless signal quality. In addition, there is a significant high overlap coverage phenomenon in low-altitude networks. The proportion of >= 4 cells with the strongest cell RSRP difference below 6 dB in the same frequency reaches 27.81%.

[0190] Table 7 Low-altitude network test results

[0191]

[0192] Referring to the flight test results in Table 7, a threshold T0 = 2dB can be set to filter out 5G cells with SINR values ​​exceeding the threshold T0, which are listed as the target cell set H0.

[0193] In this embodiment, by using a flight test terminal to conduct flight tests at the predetermined flight path and at the multiple flight test altitudes, the flight test results are obtained. The flight test results include signal quality detection information of multiple cells corresponding to the covered airspace. Cells with SINR values ​​greater than a preset threshold among the multiple cells are identified as target cells. This allows the target cells to be screened out based on the SINR values ​​obtained from actual tests, ensuring that the target cells have high signal quality, thereby improving the communication reliability of the flight terminal during flight.

[0194] Optionally, after sending cell configuration information to the flight terminal flying on the predetermined route, the method further includes:

[0195] When the flight terminal is detected to be switching from the first cell to the second cell via the NG interface, a first handover request message carrying the RFSP index information is sent to the AMF through the source base station corresponding to the first cell, and a second handover request message carrying the RFSP index information is sent to the target base station corresponding to the second cell through the AMF, wherein the second cell is one of the at least one target cell;

[0196] Alternatively, if it is detected that the flight terminal has switched from the first cell to the second cell via the Xn interface, the RFSP index information is obtained from the AMF through the source base station corresponding to the first cell, and a second handover request message carrying the RFSP index information is sent to the target base station corresponding to the second cell.

[0197] Specifically, the aforementioned NG interface can be the interface between the gNB and the core network, and the aforementioned Xn interface can be the communication interface between gNBs.

[0198] It should be noted that RFSP is transmitted through different signaling messages at different stages of the network, including the following:

[0199] (1) When the UE is initially connected, the UDM transmits the operator-configured RFSP to the AMF through the N8 interface message. The AMF then transmits the RFSP transmitted by the UDM to the gNodeB through the Initial Context Establishment Request message (INITIAL CONTEXT SETUP REQUEST).

[0200] (2) The NG link has been established. If the UE enters the connected state from the idle state, the AMF will transmit the RFSP transmitted by the UDM to the gNodeB through the downlink non-access stratum transport message (DOWNLINK NAS TRANSPORT).

[0201] (3) Core network modifies RFSP. During data transmission, if UDM modifies RFSP, UDM will pass the updated RFSP to AMF through N8 interface message, and AMF will finally pass it to gNodeB through UE CONTEXTMODIFICATION REQUEST message.

[0202] (4) When the UE performs an NG handover, the source gNodeB transmits the RFSP to the AMF through the handover request message (HANDOVER REQUIRED), and then the AMF transmits the RFSP to the target gNodeB through the HANDOVER REQUEST message.

[0203] (5) When the UE performs Xn handover, the source gNodeB transmits the RFSP obtained from the AMF to the target gNodeB through a handover request message (HANDOVER REQUEST).

[0204] In this embodiment, when the flight terminal is detected to be switching from the first cell to the second cell via the NG interface, a first handover request message carrying the RFSP index information is sent to the AMF via the source base station corresponding to the first cell, and a second handover request message carrying the RFSP index information is sent to the target base station corresponding to the second cell via the AMF, wherein the second cell is one of the at least one target cell; or, when the flight terminal is detected to be switching from the first cell to the second cell via the Xn interface, the RFSP index information is obtained from the AMF via the source base station corresponding to the first cell, and a second handover request message carrying the RFSP index information is sent to the target base station corresponding to the second cell. This allows the RFSP index information to be transmitted to the target base station in advance, enabling the target base station to directly select the target frequency point, thereby avoiding the flight terminal from re-searching for the frequency point after the handover and reducing the cell handover delay of the flight terminal.

[0205] Optionally, after sending cell configuration information to the flight terminal flying on the predetermined route, the method further includes:

[0206] The system receives a first message from the AMF carrying updated RFSP index information, which is sent to the AMF by the Unified Data Management (UDM) after modifying the RFSP index information.

[0207] Specifically, the aforementioned UDM can be a data management module in the 5G core network, responsible for storing and managing user data. The updated RFSP index information can be obtained by the UDM modifying and updating the RFSP index information according to the cell signal quality.

[0208] In this embodiment, by receiving a first message from the AMF carrying updated RFSP index information, which is sent to the AMF by the Unified Data Management (UDM) after modifying the RFSP index information, the real-time transmission of the updated RFSP index information can be ensured, reducing handover failures or communication delays caused by lag in RFSP index information.

[0209] See Figure 4 , Figure 4 This is a second flowchart of a cell handover control method provided in this application embodiment, applied to a flight terminal, such as... Figure 4 As shown, the method includes the following steps:

[0210] Step 401: Receive cell configuration information sent by the network-side device, wherein the cell configuration information is used to instruct the flight terminal to switch between cells corresponding to the target frequency point;

[0211] Step 402: Perform cell handover according to the cell configuration information. The cell after handover is one of the cells corresponding to the target frequency point.

[0212] It should be noted that this embodiment is as a comparison with... Figure 1 The embodiments shown in the figure correspond to the implementation methods of the flight terminal. For specific implementation methods, please refer to [link / reference]. Figure 1 To avoid repetition, the relevant descriptions in the embodiments shown will not be repeated in this embodiment.

[0213] Optionally, the cell configuration information received by the network-side device includes:

[0214] The network-side device receives RFSP index information, which is the RFSP index corresponding to the target frequency point, and the RFSP index information is used to indicate the target frequency point.

[0215] The above optional implementation methods can be found in [reference]. Figure 1 To avoid repetition, the relevant descriptions in the embodiments shown will not be repeated in this embodiment.

[0216] See Figure 5 , Figure 5 This is one of the structural schematic diagrams of a cell handover control device provided in the embodiments of this application, applied to network-side equipment, such as... Figure 5 As shown, the cell handover control device 500 includes:

[0217] The first determining module 501 is used to determine, based on the flight test results on the predetermined route, at least one target cell in the coverage airspace corresponding to the predetermined route whose signal quality meets preset conditions, wherein the flight test results include signal quality detection data of the coverage airspace corresponding to the predetermined route.

[0218] Modification module 502 is used to change the synchronization signal block SSB frequency point of the target cell to the target frequency point;

[0219] The first transmitting module 503 is used to transmit cell configuration information to a flight terminal flying on the predetermined route, wherein the cell configuration information is used to instruct the flight terminal to switch between cells corresponding to the target frequency.

[0220] Optionally, the first transmitting module 503 includes:

[0221] The determining unit is used to determine the inter-system inter-frequency selection priority (RFSP) index information corresponding to the target frequency point, and send the RFSP index information to the flight terminal. The RFSP index information is used to indicate the target frequency point.

[0222] Optionally, the modification module 502 includes:

[0223] The first modification unit is configured to change the SSB frequency point of the target cell to the target frequency point through first configuration information, wherein the first configuration information includes the absolute frequency point number (NARFCN) representing the target frequency point;

[0224] Alternatively, the second modification unit is used to change the SSB frequency of the target cell to the target frequency using second configuration information, wherein the second configuration information includes the Global Synchronization Channel Number (GSCN) representing the target frequency.

[0225] Optionally, the cell handover control device 500 further includes:

[0226] The second determination module is used to determine the coverage airspace of the low-altitude network to be tested based on the low-altitude service demand information.

[0227] The third determining module is used to determine the predetermined route based on the airspace to be tested, and to set multiple flight test altitudes corresponding to the predetermined route.

[0228] Optionally, the flight test results are obtained in the following manner:

[0229] Using a flight test terminal, flight tests are conducted along the predetermined route at the multiple flight test altitudes to obtain the flight test results. The flight test results include signal quality detection information of multiple cells corresponding to the covered airspace, and the signal quality detection information includes signal-to-interference-plus-noise ratio (SINR) values.

[0230] The target cell is identified as the cell whose SINR value is greater than a preset threshold among the plurality of cells.

[0231] Optionally, the cell handover control device 500 further includes:

[0232] The second sending module is configured to, when detecting that the flight terminal has switched from the first cell to the second cell via the NG interface, send a first handover request message carrying the RFSP index information to the AMF through the source base station corresponding to the first cell, and send a second handover request message carrying the RFSP index information to the target base station corresponding to the second cell through the AMF, wherein the second cell is one of the at least one target cell;

[0233] Alternatively, the third sending module is configured to, upon detecting that the flight terminal has switched from the first cell to the second cell via the Xn interface, obtain the RFSP index information from the AMF through the source base station corresponding to the first cell, and send a second handover request message carrying the RFSP index information to the target base station corresponding to the second cell.

[0234] Optionally, the cell handover control device 500 further includes:

[0235] The second receiving module is used to receive a first message sent by the AMF carrying updated RFSP index information, wherein the updated RFSP index information is sent to the AMF by the Unified Data Management (UDM) after modifying the RFSP index information.

[0236] It should be noted that the cell handover control device provided in this application embodiment is a device capable of executing the above-described cell handover control method. Therefore, all implementation methods in the above-described cell handover control method embodiments are applicable to this device and can achieve the same or similar beneficial effects. To avoid repetition, this embodiment will not elaborate further.

[0237] See Figure 6 , Figure 6 This is a second structural schematic diagram of a cell handover control device provided in this application embodiment, applied to a flight terminal, such as... Figure 6 As shown, the cell handover control device 600 includes:

[0238] The first receiving module 601 is used to receive cell configuration information sent by the network side device, wherein the cell configuration information is used to instruct the flight terminal to switch between cells corresponding to the target frequency point;

[0239] The switching module 602 is used to perform cell switching according to the cell configuration information, and the switched cell is one of the cells corresponding to the target frequency point.

[0240] Optionally, the first receiving module 601 includes:

[0241] The receiving unit is configured to receive RFSP index information sent by the network-side device, wherein the RFSP index information is the RFSP index corresponding to the target frequency point, and the RFSP index information is used to indicate the target frequency point.

[0242] It should be noted that the cell handover control device provided in this application embodiment is a device capable of executing the above-described cell handover control method. Therefore, all implementation methods in the above-described cell handover control method embodiments are applicable to this device and can achieve the same or similar beneficial effects. To avoid repetition, this embodiment will not elaborate further.

[0243] For details, see Figure 7 As shown in the figure, this application embodiment also provides a network side device, including a bus 701, a transceiver 702, an antenna 703, a bus interface 704, a processor 705, and a memory 706.

[0244] Processor 705, used for:

[0245] Based on the flight test results on the predetermined route, at least one target cell in the coverage airspace corresponding to the predetermined route whose signal quality meets the preset conditions is determined. The flight test results include signal quality detection data of the coverage airspace corresponding to the predetermined route.

[0246] Change the SSB frequency point of the synchronization signal block of the target cell to the target frequency point;

[0247] Transceiver 702 is used to send cell configuration information to a flight terminal flying on the predetermined route, the cell configuration information being used to instruct the flight terminal to switch between cells corresponding to the target frequency.

[0248] exist Figure 7 In this document, a bus architecture (represented by bus 701) is used. Bus 701 can include any number of interconnected buses and bridges, linking various circuits including one or more processors represented by processor 705 and memory represented by memory 706. Bus 701 can also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. Bus interface 704 provides an interface between bus 701 and transceiver 702. Transceiver 702 can be a single element or multiple elements, such as multiple receivers and transmitters, providing a unit for communicating with various other devices over a transmission medium. Data processed by processor 705 is transmitted over a wireless medium via antenna 703, which further receives data and transmits data to processor 705.

[0249] Processor 705 manages bus 701 and general processing, and also provides various functions, including timing, peripheral interface, voltage regulation, power management, and other control functions. Memory 706 can be used to store data used by processor 705 during operation.

[0250] Alternatively, the processor 705 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a complex programmable logic device (CPLD).

[0251] Optionally, the processor 705 is specifically used for:

[0252] The inter-system inter-frequency selection priority (RFSP) index information corresponding to the target frequency point is determined, and the RFSP index information is sent to the flight terminal. The RFSP index information is used to indicate the target frequency point.

[0253] Optionally, the processor 705 is specifically used for:

[0254] The SSB frequency of the target cell is changed to the target frequency by means of first configuration information, wherein the first configuration information includes the absolute frequency number NARFCN representing the target frequency;

[0255] Alternatively, the SSB frequency of the target cell can be changed to the target frequency using second configuration information, whereby the second configuration information includes the Global Synchronization Channel Number (GSCN) representing the target frequency.

[0256] Optionally, the processor 705 is further configured to:

[0257] Based on the low-altitude service demand information, determine the coverage airspace of the low-altitude network to be tested;

[0258] The predetermined flight path is determined based on the airspace to be tested, and multiple flight test altitudes corresponding to the predetermined flight path are set.

[0259] Optionally, the flight test results are obtained in the following manner:

[0260] Using a flight test terminal, flight tests are conducted along the predetermined route at the multiple flight test altitudes to obtain the flight test results. The flight test results include signal quality detection information of multiple cells corresponding to the covered airspace, and the signal quality detection information includes signal-to-interference-plus-noise ratio (SINR) values.

[0261] The target cell is identified as the cell whose SINR value is greater than a preset threshold among the plurality of cells.

[0262] Optionally, the transceiver 702 is further configured to:

[0263] When the flight terminal is detected to be switching from the first cell to the second cell via the NG interface, a first handover request message carrying the RFSP index information is sent to the AMF through the source base station corresponding to the first cell, and a second handover request message carrying the RFSP index information is sent to the target base station corresponding to the second cell through the AMF, wherein the second cell is one of the at least one target cell;

[0264] Alternatively, if it is detected that the flight terminal has switched from the first cell to the second cell via the Xn interface, the RFSP index information is obtained from the AMF through the source base station corresponding to the first cell, and a second handover request message carrying the RFSP index information is sent to the target base station corresponding to the second cell.

[0265] Optionally, the transceiver 702 is further configured to:

[0266] The system receives a first message from the AMF carrying updated RFSP index information, which is sent to the AMF by the Unified Data Management (UDM) after modifying the RFSP index information.

[0267] It should be noted that the network-side device provided in this application embodiment is an apparatus capable of executing the above-described cell handover control method. Therefore, all implementation methods in the above-described cell handover control method embodiments are applicable to this electronic device and can achieve the same or similar beneficial effects. To avoid repetition, this embodiment will not elaborate further.

[0268] For details, see Figure 8 As shown in the figure, this application embodiment also provides a flight terminal, including a bus 801, a transceiver 802, an antenna 803, a bus interface 804, a processor 805, and a memory 806.

[0269] The transceiver 802 is used to receive cell configuration information sent by the network-side equipment. The cell configuration information is used to instruct the flight terminal to switch between cells corresponding to the target frequency.

[0270] The processor 805 is used to perform cell handover according to the cell configuration information, and the cell after handover is one of the cells corresponding to the target frequency point.

[0271] Optionally, the transceiver 802 is specifically used for:

[0272] The network-side device receives RFSP index information, which is the RFSP index corresponding to the target frequency point, and the RFSP index information is used to indicate the target frequency point.

[0273] It should be noted that the flight terminal provided in this application embodiment is a device capable of executing the above-described cell handover control method. Therefore, all implementation methods in the above-described cell handover control method embodiments are applicable to this electronic device and can achieve the same or similar beneficial effects. To avoid repetition, this embodiment will not elaborate further.

[0274] This application also provides a communication device, including: a processor, a memory, and a program stored in the memory and executable on the processor. When the program is executed by the processor, it implements the various processes of the above-described cell handover control method embodiments and achieves the same technical effect. To avoid repetition, it will not be described again here.

[0275] This application also provides a computer-readable storage medium storing a computer program. When executed by a processor, this computer program implements the various processes of the above-described cell handover control method embodiments and achieves the same technical effects. To avoid repetition, it will not be described again here. The computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, etc.

[0276] This application also provides a computer program product, including computer instructions. When executed by a processor, the computer instructions implement the various processes of the above-described cell handover control method embodiments and achieve the same technical effects. To avoid repetition, they will not be described again here.

[0277] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0278] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0279] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A cell handover control method, characterized in that, Applied to network-side devices, the method includes: Based on the flight test results on the predetermined route, at least one target cell in the coverage airspace corresponding to the predetermined route whose signal quality meets the preset conditions is determined. The flight test results include signal quality detection data of the coverage airspace corresponding to the predetermined route. Change the SSB frequency point of the synchronization signal block of the target cell to the target frequency point; Send cell configuration information to the flight terminal flying on the predetermined route, the cell configuration information being used to instruct the flight terminal to switch between cells corresponding to the target frequency point; Sending cell configuration information to the flight terminal flying on the predetermined route includes: The inter-system inter-frequency selection priority (RFSP) index information corresponding to the target frequency point is determined, and the RFSP index information is sent to the flight terminal. The RFSP index information is used to indicate the target frequency point.

2. The method according to claim 1, characterized in that, The step of changing the synchronization signal block (SSB) frequency point of the target cell to the target frequency point includes: The SSB frequency of the target cell is changed to the target frequency by means of first configuration information, wherein the first configuration information includes the absolute frequency number NARFCN representing the target frequency; Alternatively, the SSB frequency of the target cell can be changed to the target frequency using second configuration information, whereby the second configuration information includes the Global Synchronization Channel Number (GSCN) representing the target frequency.

3. The method according to claim 1, characterized in that, Before determining, based on flight test results along the predetermined route, at least one target cell in the coverage airspace corresponding to the predetermined route whose signal quality meets preset conditions, the method further includes: Based on the low-altitude service demand information, determine the coverage airspace of the low-altitude network to be tested; The predetermined flight path is determined based on the airspace to be tested, and multiple flight test altitudes corresponding to the predetermined flight path are set.

4. The method according to claim 3, characterized in that, The flight test results were obtained in the following manner: Using a flight test terminal, flight tests are conducted along the predetermined route at the multiple flight test altitudes to obtain the flight test results. The flight test results include signal quality detection information of multiple cells corresponding to the covered airspace, and the signal quality detection information includes signal-to-interference-plus-noise ratio (SINR) values. The target cell is identified as the cell whose SINR value is greater than a preset threshold among the plurality of cells.

5. The method according to claim 1, characterized in that, After sending cell configuration information to the flight terminal flying on the predetermined route, the method further includes: When the flight terminal is detected to be switching from the first cell to the second cell via the NG interface, a first handover request message carrying the RFSP index information is sent to the AMF through the source base station corresponding to the first cell, and a second handover request message carrying the RFSP index information is sent to the target base station corresponding to the second cell through the AMF, wherein the second cell is one of the at least one target cell; Alternatively, if it is detected that the flight terminal has switched from the first cell to the second cell via the Xn interface, the RFSP index information is obtained from the AMF through the source base station corresponding to the first cell, and a second handover request message carrying the RFSP index information is sent to the target base station corresponding to the second cell.

6. The method according to claim 1, characterized in that, After sending cell configuration information to the flight terminal flying on the predetermined route, the method further includes: The system receives a first message from the AMF carrying updated RFSP index information, which is sent to the AMF by the Unified Data Management (UDM) after modifying the RFSP index information.

7. A cell handover control method, characterized in that, Applied to a flight terminal, the method includes: The flight terminal receives cell configuration information sent by the network-side equipment, the cell configuration information being used to instruct the flight terminal to switch between cells corresponding to the target frequency point; Cell handover is performed based on the cell configuration information, and the switched cell is one of the cells corresponding to the target frequency point; The cell configuration information received from the network-side device includes: The network-side device receives RFSP index information, which is the RFSP index corresponding to the target frequency point, and the RFSP index information is used to indicate the target frequency point.

8. A cell handover control device, characterized in that, Applied to network-side devices, the device includes: The first determining module is used to determine, based on the flight test results on the predetermined route, at least one target cell in the coverage airspace corresponding to the predetermined route whose signal quality meets preset conditions, wherein the flight test results include signal quality detection data of the coverage airspace corresponding to the predetermined route. The module is used to change the synchronization signal block (SSB) frequency point of the target cell to the target frequency point; The first transmitting module is used to transmit cell configuration information to a flight terminal flying on the predetermined route, wherein the cell configuration information is used to instruct the flight terminal to switch between cells corresponding to the target frequency. The first sending module includes: The determining unit is used to determine the inter-system inter-frequency selection priority (RFSP) index information corresponding to the target frequency point, and send the RFSP index information to the flight terminal. The RFSP index information is used to indicate the target frequency point.

9. A cell handover control device, characterized in that, The device, applied to a flight terminal, includes: The first receiving module is used to receive cell configuration information sent by the network-side device, wherein the cell configuration information is used to instruct the flight terminal to switch between cells corresponding to the target frequency point; The handover module is used to perform cell handover according to the cell configuration information, and the cell after handover is one of the cells corresponding to the target frequency point; The first receiving module includes: The receiving unit is configured to receive RFSP index information sent by the network-side device, wherein the RFSP index information is the RFSP index corresponding to the target frequency point, and the RFSP index information is used to indicate the target frequency point.

10. A network-side device, characterized in that, Includes a transceiver and a processor, the processor being used for: Based on the flight test results on the predetermined route, at least one target cell in the coverage airspace corresponding to the predetermined route whose signal quality meets the preset conditions is determined. The flight test results include signal quality detection data of the coverage airspace corresponding to the predetermined route. Change the SSB frequency point of the synchronization signal block of the target cell to the target frequency point; The transceiver is used to send cell configuration information to a flight terminal flying on the predetermined route, the cell configuration information being used to instruct the flight terminal to switch between cells corresponding to the target frequency. The processor is specifically used for: The inter-system inter-frequency selection priority (RFSP) index information corresponding to the target frequency point is determined, and the RFSP index information is sent to the flight terminal. The RFSP index information is used to indicate the target frequency point.

11. A flight terminal, characterized in that, Including transceiver and processor: The transceiver is used to receive cell configuration information sent by network-side equipment. The cell configuration information is used to instruct the flight terminal to switch between cells corresponding to the target frequency. The processor is used to perform cell handover according to the cell configuration information, wherein the cell after handover is one of the cells corresponding to the target frequency point; The transceiver is specifically used for: The network-side device receives RFSP index information, which is the RFSP index corresponding to the target frequency point, and the RFSP index information is used to indicate the target frequency point.

12. A communication device, characterized in that, include: A processor, a memory, and a program stored in the memory and executable on the processor, wherein the program, when executed by the processor, implements the steps of the cell handover control method as described in any one of claims 1 to 6; or, the program, when executed by the processor, implements the steps of the cell handover control method as described in any one of claims 7.

13. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the cell handover control method as described in any one of claims 1 to 6; or, when executed by a processor, the computer program implements the steps of the cell handover control method as described in any one of claims 7.

14. A computer program product, characterized in that, The method includes computer instructions that, when executed by a processor, implement the steps of the cell handover control method as described in any one of claims 1 to 6; or, when executed by a processor, the computer instructions implement the steps of the cell handover control method as described in any one of claims 7.

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