Connection management method for unmanned aerial vehicle base station and unmanned aerial vehicle base station

Abstract

The invention provides a connection management method for an unmanned aerial vehicle base station and the unmanned aerial vehicle base station, and relates to the technical field of communication. In the method, an unmanned aerial vehicle base station determines a first message and sends the first message to a target UE at a first moment, the first message is used for indicating that a target area does not have wireless signal coverage within a preset time period and simultaneously indicating that the target UE does not trigger an RLF, and identifier information corresponding to a target cell is reserved; according to the method and the device, the target UE directly performs RRC connection reestablishment through the pre-reserved first C-RNTI under the condition that wireless signal coverage of a subsequent target area is recovered and the identification information of the cell in which the wireless signal coverage is recovered is consistent with the identification information corresponding to the target cell according to the identification information of the target cell and the first C-RNTI corresponding to the first cell managed by the unmanned aerial vehicle base station at this time, so that the target UE performs RRC connection reestablishment directly through the pre-reserved first C-RNTI. And the C-RNTI does not need to be obtained again, so that the signaling overhead is reduced, and the overall performance of a communication system is improved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a connection management method for an unmanned aerial vehicle base station and an unmanned aerial vehicle base station. Background Art

[0002] To expand the coverage of backpack base stations, they can work in conjunction with unmanned aerial vehicles (UAVs) to provide network coverage for hard-to-reach temporary communication islands. This is accomplished by flying the UAV within 10 to 20 kilometers of the vehicle-mounted backpack base station, maintaining a vertical altitude below 120 meters. The UAV connects to the vehicle-mounted backpack base station via a direct line of sight (LOS) path, providing stable communication services to user equipment (UE) within the temporary communication island. In this configuration, the UE's communication transmission path is: UE-UAV-BASE-T-satellite-core network.

[0003] However, due to the limited battery life of UAVs, a single charge can only maintain communication time of 10 to 30 minutes. Therefore, when the UAV battery is low, it needs to return to the communication vehicle for charging before it can resume communication missions.

[0004] Every time the UAV leaves the target area to charge, the UE in the RRC connection state will determine that the wireless link has failed if no wireless signal coverage is detected, and will try to search for and connect to a new cell. If there is no new cell, the network will be disconnected. After the UE is disconnected from the network, when the UAV returns to the target area, that is, when the UE detects wireless signal coverage again, the UE will re-initiate the RRC connection establishment request, re-acquire the C-RNTI, and the core network will restore the network service to the UE by reporting the service temporary mobile user identity S-TMSI. This frequent disconnection and reconnection process will lead to a large consumption of communication resources between backpack base stations, satellites, and core network nodes, resulting in higher signaling interaction overhead, thereby increasing the burden on the communication system and reducing the overall performance of the communication system. Summary of the Invention

[0005] The present application provides a connection management method for an unmanned aerial vehicle base station and an unmanned aerial vehicle base station to solve the problem in the prior art that each time the unmanned aerial vehicle leaves the target area for charging and returns to the target area after charging is completed, the connection between the UE and the core network will be reestablished, thereby resulting in high signaling overhead.

[0006] In a first aspect, the present application provides a connection management method for an unmanned aerial vehicle base station, the method comprising: The unmanned aerial vehicle base station determines a first message, where the first message is used to indicate to a target user equipment UE that there is no wireless signal coverage in a target area within a preset time period, and to instruct the target UE not to trigger a radio link failure (RLF), retain the first cell temporary user identity (C-RNTI) allocated to the target UE by the entity where the first cell is located, and record the identification information corresponding to the target cell; wherein the target area is an area in which the unmanned aerial vehicle provides wireless signal coverage this time, and the unmanned aerial vehicle is communicatively connected to the unmanned aerial vehicle base station; the target UE is a UE connected to the unmanned aerial vehicle base station in the target area; and the first cell is a cell currently managed by the unmanned aerial vehicle base station. The unmanned aerial vehicle base station sends a first message to the target UE at a first moment, so that the target UE does not trigger RLF based on the first message, retains the first C-RNTI, and records the identification information corresponding to the target cell; wherein, the first moment is before the start time of the preset time period, and the identification information corresponding to the target cell is the cell global identifier CGI and / or physical cell identifier PCI of the target cell.

[0007] In one possible design, the target cell is the first cell or the second cell, and the second cell is the cell that the UAV base station expects to manage when the UAV provides wireless signal coverage in the target area next time; When the target cell is the first cell, the first message is used to instruct the target UE to record first identification information corresponding to the first cell, where the first identification information is the CGI and / or PCI of the first cell; In the case where the target cell is the second cell, the first message is used to instruct the target UE to record second identification information corresponding to the second cell, where the second identification information is the CGI and / or PCI of the second cell.

[0008] In one possible design, the first message is also used to indicate a first timing duration, which is used to indicate the target UE to retain the first C-RNTI and the duration for recording the identification information corresponding to the target cell.

[0009] In one possible design, the unmanned aerial vehicle base station sends a first message to the target UE via a system information block SIB, downlink control information DCI, or a media access control layer control element MAC CE.

[0010] In a second aspect, the present application provides a connection management method for an unmanned aerial vehicle base station, the method comprising: The target user equipment UE receives a first message sent by the unmanned aerial vehicle base station, where the first message is sent by the unmanned aerial vehicle base station at a first moment, and is used to indicate to the target UE that there is no wireless signal coverage in the target area within the preset time period, and to instruct the target UE not to trigger a radio link failure RLF, retain the first cell temporary user identity C-RNTI allocated to the target UE by the entity where the first cell is located, and record the identification information corresponding to the target cell; wherein the first moment is before the start moment of the preset time period, the target area is the area where the unmanned aerial vehicle provides wireless signal coverage this time, and the unmanned aerial vehicle is communicatively connected to the unmanned aerial vehicle base station; the target UE is a UE connected to the unmanned aerial vehicle base station in the target area; and the first cell is the cell managed by the unmanned aerial vehicle base station this time; Based on the first message, the target UE does not trigger RLF, retains the first C-RNTI, and records the identification information corresponding to the target cell; wherein the identification information corresponding to the target cell is the cell global identifier CGI and / or physical cell identifier PCI of the target cell.

[0011] In one possible design, the target cell is the first cell or the second cell, and the second cell is the cell that the UAV base station expects to manage when the UAV provides wireless signal coverage in the target area next time; In a case where the target cell is the first cell, the target UE records first identification information corresponding to the first cell, where the first identification information is the CGI and / or PCI of the first cell; In the case that the target cell is the second cell, the target UE records second identification information corresponding to the second cell, where the second identification information is the CGI and / or PCI of the second cell.

[0012] In one possible design, after the target UE does not trigger RLF based on the first message, retains the first C-RNTI, and records the identification information corresponding to the target cell, the method further includes: When the target UE detects wireless signal coverage after the second moment, the target UE determines third identification information corresponding to a third cell; wherein the third cell is the cell actually managed by the unmanned aerial vehicle base station when the unmanned aerial vehicle provides wireless signal coverage in the target area next time; the third identification information is the CGI and / or PCI of the third cell; and the second moment is the starting moment of the preset time period; When the third identification information is consistent with the identification information corresponding to the target cell, the target UE sends a second message to the unmanned aerial vehicle base station, where the second message is used to request the unmanned aerial vehicle base station to re-establish the radio resource control RRC connection with the target UE, or to indicate the first C-RNTI to the unmanned aerial vehicle base station; wherein the second message carries the first C-RNTI.

[0013] In one possible design, after the target UE does not trigger RLF based on the first message, retains the first C-RNTI, and records the identification information corresponding to the target cell, the method further includes: The target UE starts a timer, where the timing duration of the timer is a first timing duration, where the first timing duration is used to indicate a duration for which the target UE retains the identification information corresponding to the first C-RNTI and the target cell; When the timer times out and no wireless signal coverage is detected, the target UE deletes the identification information corresponding to the first C-RNTI and the target cell.

[0014] In a third aspect, the present application provides an unmanned aerial vehicle base station, comprising: a memory and a processor; The memory is configured to store computer program instructions; The processor is configured to run the computer program instructions so that the unmanned aerial vehicle base station implements the method as described in any one of the first aspects.

[0015] In a fourth aspect, the present application provides a communication device, comprising: a module for executing the method described in the first aspect or various possible designs of the first aspect, or a module for executing the method described in the second aspect.

[0016] In a fifth aspect, the present application provides a communication system, comprising: an unmanned aerial vehicle base station for executing the method described in the first aspect and various possible designs of the first aspect, and a target UE for executing the method described in the second aspect and various possible designs of the second aspect.

[0017] In a sixth aspect, the present application provides an electronic device, comprising: a memory and at least one processor; The memory stores computer-executable instructions; The at least one processor executes the computer-executable instructions stored in the memory, so that the at least one processor executes the method described in the first aspect, various possible designs of the first aspect, the second aspect, or various possible designs of the second aspect.

[0018] In the seventh aspect, an embodiment of the present application provides a computer-readable storage medium, which stores computer execution instructions. When the computer execution instructions are executed, the method described in the first aspect, various possible designs of the first aspect, the second aspect, or various possible designs of the second aspect is implemented.

[0019] In an eighth aspect, the present application provides a computer program product, which includes a computer program code. When the computer program code runs on a computer, the computer implements the method described in the first aspect, various possible designs of the first aspect, the second aspect, or various possible designs of the second aspect.

[0020] In the ninth aspect, the present application provides a chip comprising: an interface circuit and a logic circuit, wherein the interface circuit is used to receive signals from other chips outside the chip and transmit them to the logic circuit, or to send signals from the logic circuit to other chips outside the chip, and the logic circuit is used to implement the method described in the first aspect, various possible designs of the first aspect, the second aspect, or various possible designs of the second aspect.

[0021] An embodiment of the present application provides a connection management method for an unmanned aerial vehicle base station and an unmanned aerial vehicle base station. In this method, the unmanned aerial vehicle base station determines a first message, and the first message is used to indicate to the target UE that the target area for which the unmanned aerial vehicle provides wireless signal coverage this time will temporarily have no wireless signal coverage within a preset time period, and at the same time instruct the target UE not to trigger RLF, retain the first C-RNTI corresponding to the cell currently managed by the unmanned aerial vehicle base station, and record the identification information corresponding to the target cell. Subsequently, the unmanned aerial vehicle base station sends the first message to the target UE before the start time of the preset time period to ensure that the target UE does not trigger RLF when there is no wireless signal coverage in the target area, and can retain the first C-RNTI, and at the same time record the identification information corresponding to the target cell. In the present application, the unmanned aerial vehicle base station can restore wireless signal coverage of the target UE in the target area by sending a first message to the target UE. When the identification information of the cell where the wireless signal coverage is restored is consistent with the identification information corresponding to the target cell, the RRC connection is re-established directly through the pre-reserved first C-RNTI without the need to re-acquire the C-RNTI, effectively saving communication resources between backpack base stations, satellites, and core network nodes, reducing signaling overhead, alleviating the burden on the communication system, and improving the overall performance of the communication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the network structure of an existing cellular communication system; Figure 2A schematic diagram of the structure of a satellite communication system applicable to embodiments of the present application; Figure 3 A flow chart of a connection management method for an unmanned aerial vehicle base station provided in an embodiment of the present application; Figure 4 A flow chart of another connection management method for an unmanned aerial vehicle base station provided in an embodiment of the present application; Figure 5 A flowchart of another connection management method for an unmanned aerial vehicle base station provided in an embodiment of the present application; Figure 6 A flowchart of another connection management method for an unmanned aerial vehicle base station provided in an embodiment of the present application; Figure 7 A flowchart of another connection management method for an unmanned aerial vehicle base station provided in an embodiment of the present application; Figure 8 A flowchart of another connection management method for an unmanned aerial vehicle base station provided in an embodiment of the present application; Figure 9 A flowchart of another method for managing a connection of an unmanned aerial vehicle base station provided in an embodiment of the present application; Figure 10 A schematic structural diagram of an unmanned aerial vehicle base station provided in an embodiment of the present application; Figure 11 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0023] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification, claims and drawings of this application are intended to cover non-exclusive inclusions.

[0025] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase "embodiment" in various places in the specification does not necessarily refer to the same embodiment, nor does it necessarily refer to independent or alternative embodiments that are mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0026] The term "and / or" in this document simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists, A and B can exist at the same time, and B exists. Additionally, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0027] In addition, the terms "first", "second", etc. in the description and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order, and may explicitly or implicitly include one or more such features.

[0028] In the description of this application, unless otherwise specified, "multiple" and "at least two" mean more than two (including two). Similarly, "multiple groups" and "at least two groups" mean more than two groups (including two).

[0029] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connect" should be understood in a broad sense. For example, "connected" or "connected" can refer not only to physical connections, but also to electrical connections or signal connections. For example, it can be a direct connection, i.e., a physical connection, or an indirect connection through at least one intermediate element, as long as circuit connectivity is achieved. It can also refer to internal connectivity between two elements. Signal connection can refer not only to signal connection through circuits, but also to signal connection through media, such as radio waves. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0030] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings. It should be noted that different technical features in the present application can be combined with each other in the absence of conflict.

[0031] First, the terms involved in one or more embodiments of this specification are explained.

[0032] A backpack base station is a base station that relies on a high-throughput satellite platform as a transmission carrier, providing communication between user equipment and the satellite. A backpack base station can also be called a portable backpack base station or a mobile backpack base station. The backpack base station communicates with the core network of the communication network via satellite. The mobile communication system can be a Wideband Code Division Multiple Access (WCDMA) system, a Frequency Division Multiple Access (FDMA) system, an Orthogonal Frequency Division Multiple Access (OFDMA) system, a General Packet Radio Service (GPRS) system, a Long Term Evolution (LTE) system, or a 5th Generation Mobile Communication Technology (5G) system, as well as other such communication systems.

[0033] UE can be a wireless terminal. A wireless terminal can be a device that provides voice and / or other service data connectivity to users, a handheld device with wireless connection capabilities, or other processing devices connected to a wireless modem. A wireless terminal can communicate with one or more core networks via a radio access network (RAN). A wireless terminal can be a mobile terminal, such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal. For example, it can be a portable, pocket-sized, handheld, computer-built-in, or vehicle-mounted mobile device that exchanges voice and / or data with the radio access network.

[0034] The Serving Temporary Mobile Subscriber Identity (S-TMSI) is a temporary identifier used in LTE and 5G mobile communication systems. The S-TMSI of a user equipment is allocated to the user equipment by the core network control plane network element. Different S-TMSIs are used to identify different user equipment. The core network control plane network element can be the Mobility Management Entity (MME) of the LTE communication system or the Access and Mobility Management Function (AMF) entity of the 5G communication system, which is not specifically limited in this embodiment.

[0035] Below, the implementation background of the technical solution provided in the embodiment of this application is introduced.

[0036] Figure 1 Figure 1 is a schematic diagram of the network structure of an existing cellular communication system. Figure 1 As shown, UEs connect to base stations via wireless interfaces, and base stations connect to the core network via optical fiber interfaces. However, in the event of natural disasters such as earthquakes and floods, optical fiber interfaces are easily damaged, resulting in disconnection between the base station and the core network, forming temporary communication islands and preventing UEs from communicating properly. Furthermore, in naturally occurring temporary communication islands, such as deserts and oceans, although multiple UEs with communication needs may exist within a small area, traditional solutions are ineffective due to the difficulty and high cost of laying optical fiber.

[0037] In order to solve the above problems, backpack base stations came into being. Figure 2 This is a schematic diagram of the structure of a satellite communication system applicable to the embodiment of the present application. Figure 2 As shown in the figure, the backpack base station is connected to the satellite through a wireless interface, and the satellite is then connected to the core network element on the ground through a wireless interface, so that UEs within the coverage area of the backpack base station can communicate normally. Even if the traditional communication infrastructure is damaged or difficult to build, reliable communication services can still be provided.

[0038] However, maintaining a continuous power supply can be a challenge during natural disasters such as earthquakes and floods, or when using backpack base stations in environments such as deserts. Backpack base stations typically rely on batteries, which typically have a battery life of between 2 and 4 hours.

[0039] In addition, backpack base stations can also work with unmanned aerial vehicles (UAVs) to provide network coverage for temporary communication islands that are difficult to reach. The specific operation is: by flying the UAV to an area 10 to 20 kilometers away from the vehicle-mounted backpack base station and maintaining a vertical altitude below 120 meters, the UAV connects to the vehicle-mounted backpack base station via a LOS direct connection path, thereby providing signal coverage for UEs in the temporary communication island; under this condition, the UE's communication transmission path is: UE-UAV-backpack base station-satellite-core network. However, the UAV's battery life is limited, and a single charge can only maintain communication time for 10 to 30 minutes. After that, it must return to the communication vehicle for charging before it can perform communication tasks again.

[0040] In related technologies, when a UAV leaves a target area (the area covered by the UAV signal), a UE in a Radio Resource Control (RRC) connection state may be transmitting data. If the UE fails to detect wireless signal coverage, it will determine that the wireless link has failed, triggering a cross-band signal search.

[0041] If the UE detects a new cell signal during the search process, it will initiate an RRC connection establishment request to the new cell. If the UE fails to detect a new cell signal during the search process, it will disconnect from the existing network. Later, when the UE detects wireless signal coverage again, it will re-initiate an RRC connection establishment request, re-acquire the C-RNTI, and report its locally stored S-TMSI to the core network through the backpack base station. The core network identifies the UE based on the S-TMSI, completes the key update, and provides network services to the UE. This frequent disconnection and reconnection process will lead to a large consumption of communication resources between backpack base stations, satellites, and core network nodes, resulting in high signaling interaction overhead, thereby increasing the burden on the communication system and reducing the overall performance of the communication system.

[0042] An embodiment of the present application provides a connection management method for an unmanned aerial vehicle base station and an unmanned aerial vehicle base station. In this method, the unmanned aerial vehicle base station determines a first message, and the first message is used to indicate to the target UE that the target area for which the unmanned aerial vehicle provides wireless signal coverage this time will temporarily have no wireless signal coverage within a preset time period, and at the same time instruct the target UE not to trigger RLF, retain the first C-RNTI corresponding to the cell currently managed by the unmanned aerial vehicle base station, and record the identification information corresponding to the target cell. Subsequently, the unmanned aerial vehicle base station sends the first message to the target UE before the start time of the preset time period to ensure that the target UE does not trigger RLF when there is no wireless signal coverage in the target area, and can retain the first C-RNTI, and at the same time record the identification information corresponding to the target cell. In the present application, the unmanned aerial vehicle base station can restore wireless signal coverage of the target UE in the target area by sending a first message to the target UE. When the identification information of the cell where the wireless signal coverage is restored is consistent with the identification information corresponding to the target cell, the RRC connection is re-established directly through the pre-reserved first C-RNTI without the need to re-acquire the C-RNTI, effectively saving communication resources between backpack base stations, satellites, and core network nodes, reducing signaling overhead, alleviating the burden on the communication system, and improving the overall performance of the communication system.

[0043] Next, some specific embodiments and drawings are used to describe in detail how the present application solves the above-mentioned problem that each time the UAV leaves the target area for charging and returns to the target area after charging is completed, the connection between the UE and the core network will be reestablished, which in turn leads to high signaling overhead.

[0044] Figure 3 The following is a flow chart of a connection management method for an unmanned aerial vehicle base station provided in an embodiment of the present application. Figure 3As shown, the connection management method for an unmanned aerial vehicle base station provided in an embodiment of the present application specifically includes S301 and S302, and S301 and S302 are described in detail below.

[0045] S301. The UAV base station determines a first message.

[0046] The target UE is a UE connected to the UAV base station in the target area.

[0047] It should be noted that the target area is the area where the UAV provides wireless signal coverage this time, and the UAV is communicatively connected with the UAV base station.

[0048] It should be noted that the target area is the geographical area currently covered by the wireless signal emitted by the UAV. The target area is the area where the signal emitted by the UAV through its communication equipment (such as a radio transmitter) can effectively reach. Within the target area, the target UE can communicate with the UAV base station.

[0049] Among them, the first message is used to indicate to the target UE that there is no wireless signal coverage in the target area within a preset time period, and to instruct the target UE not to trigger the radio link failure RLF, retain the first C-RNTI allocated to the target UE by the entity where the first cell is located, and record the identification information corresponding to the target cell.

[0050] The entity where the first cell is located is the unmanned aerial vehicle base station that provides wireless signal coverage for the target area this time.

[0051] It should be noted that the target area lacks wireless signal coverage within the preset time period, which means that the UAV leaves the target area within the preset time period. The preset time period can be set by the user or calculated by the UAV based on its own power information, and this embodiment does not specifically limit this.

[0052] For example, if an unmanned aerial vehicle (UAV) is used to provide temporary communication services in area A, the user can pre-set the UAV to provide wireless signal coverage for area A starting at time X and for Y hours based on the UAV's battery level. In this case, the start time of the preset time period can be determined based on the preset time X and Y hours, and the end time of the preset time period can be determined based on the length of time the UAV has been away.

[0053] Specifically, if an unmanned aerial vehicle is used to provide temporary communication services in Area A, the UAV charges for 0.5 hours each time, and the user pre-sets the UAV to provide wireless signal coverage for Area A starting at 1:20 PM and for a duration of 1 hour. In this case, the pre-set time period starts at 2:20 PM and ends at 2:50 PM.

[0054] For another example, if an unmanned aerial vehicle (UAV) is used to provide temporary communication services in area B, the UAV will monitor its battery level in real time and, based on its power consumption rate, estimate the duration of wireless signal coverage it can provide for area B at that level. In this case, the start time of a preset time period can be determined based on the time the UAV monitors its battery level and the estimated duration of wireless signal coverage it can provide for area B; and the end time of the preset time period can be determined based on the duration of the UAV's departure.

[0055] Specifically, if an unmanned aerial vehicle is used to provide temporary communication services in Area B, the charging time for each unmanned aerial vehicle is 0.5 hours. At 3:40 PM, the unmanned aerial vehicle detects that its battery level is 60%, and it can continue to provide wireless signal coverage for Area B for 0.8 hours. In this case, the preset time period starts at 4:28 PM and ends at 4:58 PM.

[0056] Radio Link Failure (RLF) refers to the phenomenon that the UE cannot maintain a reliable wireless connection with the base station, resulting in communication interruption.

[0057] It should be noted that in the communication system, the target UE continuously monitors the connection quality between it and the UAV base station. If the RLF condition is met, the target UE triggers RLF, abandons the first cell currently connected, and begins searching for other frequency bands or neighboring cells. The RLF condition is the same as the existing RLF condition and is not further described in this embodiment.

[0058] Among them, the first cell is the cell managed by the unmanned aerial vehicle base station this time.

[0059] It should be noted that the Cell Radio Network Temporary Identifier (C-RNTI) is a temporary identifier that is primarily used to uniquely identify a UE connection in a specific cell in a wireless communication system. The UE's C-RNTI is assigned by the base station for a single session or connection. When the UE disconnects from the base station, the C-RNTI typically becomes invalid. When the UE reconnects or establishes a new connection, the base station assigns it a new C-RNTI.

[0060] When the unmanned aerial vehicle provides wireless signal coverage for the target area and the target UE accesses the first cell managed by the unmanned aerial vehicle base station, the unmanned aerial vehicle allocates a first C-RNTI to the target UE to identify the connection of the target UE in the first cell through the first C-RNTI.

[0061] S302. The UAV base station sends a first message to the target UE at a first moment, so that the target UE does not trigger RLF based on the first message, retains the first C-RNTI, and records the identification information corresponding to the target cell.

[0062] Figure 4 This is a flow chart of another method for managing the connection of an unmanned aerial vehicle base station provided in an embodiment of the present application. Figure 4 As shown, the target UE executes Sa1, the target UE does not trigger RLF based on the first message, retains the first C-RNTI, and records the identification information corresponding to the target cell.

[0063] The first moment is before the start moment of the preset time period.

[0064] It should be noted that the first message is sent by the UAV base station to the target UE before the start time of the preset time period and at the first moment adjacent to the start time of the preset time period.

[0065] It should be noted that after the target UE receives the first message sent by the unmanned aerial vehicle base station, the target UE does not trigger RLF within the target time period regardless of whether the target UE detects a wireless signal.

[0066] The target identification information is the cell global identifier CGI and / or physical cell identifier PCI of the target cell.

[0067] It should be noted that the Cell Global Identity (CGI) is a global identifier used to uniquely identify each cell in a wireless communication system. In a communication system, the CGI is used to uniquely identify a cell globally, ensuring that each cell can be uniquely identified globally and avoiding identity conflicts.

[0068] The Physical Cell Identity (PCI) is a physical identifier used to identify each cell in a wireless communication system. The PCI is a small identifier typically used for signal synchronization and identification during radio link establishment.

[0069] In this embodiment, by avoiding the target UE from triggering RLF, unnecessary connection reconstruction can be reduced, thereby reducing signaling overhead and communication resource consumption; by recording the identification information corresponding to the target cell, it can be used when the unmanned aerial vehicle base station subsequently restores wireless signal coverage in the target area to determine whether the cell managed by the unmanned aerial vehicle after restoring wireless signal coverage is consistent with the target cell; by retaining the first C-RNTI, when the cell managed by the unmanned aerial vehicle after restoring wireless signal coverage is consistent with the target cell, the RRC connection can be directly re-established through the pre-reserved first C-RNTI without the need to re-acquire the C-RNTI, thereby reducing signaling overhead, shortening the delay for the target UE to restore the connection, alleviating the burden on the communication system, and improving the overall performance of the communication system.

[0070] An embodiment of the present application provides a connection management method for an unmanned aerial vehicle base station. The unmanned aerial vehicle base station determines a first message, which is used to indicate to a target UE that a target area for which the unmanned aerial vehicle currently provides wireless signal coverage will temporarily be without wireless signal coverage within a preset time period, and at the same time instructs the target UE not to trigger a Relay Response Lock (RLL). The first C-RNTI corresponding to the cell currently managed by the unmanned aerial vehicle base station is retained, and identification information corresponding to the target cell is recorded. Subsequently, the unmanned aerial vehicle base station sends the first message to the target UE before the start time of the preset time period to ensure that the target UE does not trigger an RLF when there is no wireless signal coverage in the target area, and retains the first C-RNTI and records identification information corresponding to the target cell. In the present application, by sending the first message to the target UE, the unmanned aerial vehicle base station can enable the target UE to restore wireless signal coverage in the target area. If the identification information of the cell where wireless signal coverage is restored is consistent with the identification information corresponding to the target cell, the unmanned aerial vehicle base station directly re-establishes the RRC connection using the pre-reserved first C-RNTI, without the need to re-acquire the C-RNTI. This effectively saves communication resources between the backpack base station, satellite, and core network nodes, reduces signaling overhead, alleviates the burden on the communication system, and improves the overall performance of the communication system.

[0071] In the above embodiment, the first message is used to instruct the target UE to record the identification information corresponding to the target cell. Next, the target cell and the identification information corresponding to the target cell are described in detail.

[0072] In a possible embodiment, the target cell is the first cell or the second cell.

[0073] The second cell is the cell that the UAV base station expects to manage when the UAV provides wireless signal coverage in the target area next time.

[0074] Figure 5This is a flow chart of another method for managing the connection of an unmanned aerial vehicle base station provided in an embodiment of the present application. Figure 5 As shown, in one embodiment of the present application, the target cell is the first cell, and the first message is used to instruct the target UE to record the first identification information corresponding to the first cell.

[0075] The first identification information is the CGI and / or PCI of the first cell.

[0076] It should be noted that the first identification information may be determined by the target UE through the system information block (SIB) broadcast by the unmanned aerial vehicle base station. Alternatively, the first identification information may be sent by the unmanned aerial vehicle base station to the target UE in a first message, so that the target UE records the first identification information corresponding to the first cell based on the first message.

[0077] Figure 6 This is a flow chart of another method for managing the connection of an unmanned aerial vehicle base station provided in an embodiment of the present application. Figure 6 As shown, in another embodiment of the present application, the target cell is a second cell, and the first message is used to instruct the target UE to record the second identification information corresponding to the second cell.

[0078] The second identification information is the CGI and / or PCI of the second cell.

[0079] It should be noted that the unmanned aerial vehicle base station can carry the second identification information in the first message so that the target UE records the second identification information corresponding to the second cell based on the first message.

[0080] In this embodiment, the unmanned aerial vehicle base station indicates the second identification information in the first message, so that the target UE can know in advance the identification information of the second cell that the unmanned aerial vehicle base station expects to manage the next time the unmanned aerial vehicle base station provides wireless signal coverage in the target area, so that the target UE can quickly access the second cell the next time the unmanned aerial vehicle base station provides wireless signal coverage in the target area, effectively shortening the target UE's network disconnection time and providing a good user experience.

[0081] In the above embodiment, the first message is used to indicate to the target UE that there is no wireless signal coverage in the target area within a preset time period, and to instruct the target UE not to trigger RLF, retain the first C-RNTI, and record the identification information corresponding to the target cell. Next, another embodiment of the first message is described in detail.

[0082] In a possible embodiment, the first message is further used to indicate the first timing duration.

[0083] The first timing duration can be set by the user according to the time it takes for the UAV base station to leave the target area, and this embodiment does not impose any specific limitation on this.

[0084] For example, the first timing duration is 5 minutes.

[0085] Figure 7 This is a flow chart of another method for managing the connection of an unmanned aerial vehicle base station provided in an embodiment of the present application. Figure 7 As shown, in another embodiment of the present application, the first message is used to indicate to the target UE that there is no wireless signal coverage in the target area within a preset time period, instruct the target UE not to trigger RLF, retain the first C-RNTI, and record the first identification information corresponding to the first cell, and instruct the target UE to record the first timing duration.

[0086] The first timing duration is used to instruct the target UE to retain the first C-RNTI and record the duration of the first identification information.

[0087] It should be noted that the first message is not only used to indicate to the target UE that there is no wireless signal coverage in the target area within a preset time period, and to indicate to the target UE not to trigger RLF, retain the first C-RNTI, and record the first identification information, but also to indicate to the target UE that the target UE retains the first C-RNTI and records the first identification information for a first timing duration.

[0088] It should be noted that after the target UE receives the first message sent by the UAV base station, the target UE does not trigger RLF within a preset time period based on the first message, retains the first C-RNTI for a first timed duration, and records the first identification information. After the first preset duration expires, the target UE releases the retained first C-RNTI and first identification information.

[0089] Specifically, the starting time of the first timing duration is the starting time of the preset time period.

[0090] In addition, after the first preset time period has passed, the target UE also releases the retained various security keys and other information. When the target UE detects wireless signal coverage again, the target UE re-initiates the RRC establishment process.

[0091] Figure 8 This is a flow chart of another method for managing the connection of an unmanned aerial vehicle base station provided in an embodiment of the present application. Figure 8 As shown, in another embodiment of the present application, the first message is used to indicate to the target UE that there is no wireless signal coverage in the target area within a preset time period, instruct the target UE not to trigger RLF, retain the first C-RNTI, and record the second identification information corresponding to the second cell, and instruct the target UE to record the first timing duration.

[0092] The first timing duration is used to instruct the target UE to retain the first C-RNTI and record the duration of the second identification information.

[0093] It should be noted that the first message is not only used to indicate to the target UE that there is no wireless signal coverage in the target area within a preset time period, and to indicate to the target UE not to trigger RLF, retain the first C-RNTI, and record the second identification information, but also to indicate to the target UE that the target UE retains the first C-RNTI and records the second identification information for a first timing duration.

[0094] It should be noted that after the target UE receives the first message sent by the UAV base station, the target UE does not trigger RLF within a preset time period based on the first message, retains the first C-RNTI for a first timed duration, and records the second identification information. After the first preset duration expires, the target UE releases the retained first C-RNTI and second identification information.

[0095] In addition, after the first preset time period has passed, the target UE also releases the retained various security keys and other information. When the target UE detects wireless signal coverage again, the target UE re-initiates the RRC establishment process.

[0096] In this embodiment, by indicating the first timing duration in the first message, the target UE can flexibly decide the validity period for the target UE to retain the first C-RNTI and the first identification information or the second identification information based on the first timing duration, thereby avoiding the target UE releasing the first C-RNTI and the first identification information or the second identification information due to excessively long network interruption time, thereby ensuring that the target UE can quickly and seamlessly restore the network connection when the wireless signal coverage is restored in the target area.

[0097] In the above embodiment, the UAV base station needs to send the first message to the target UE before the start time of the preset time period. Next, the specific manner in which the UAV base station sends the first message to the target UE is described in detail.

[0098] In a possible embodiment, the UAV base station sends the first message to the target UE via a system information block SIB, downlink control information DCI, or a media access control layer control element MAC CE.

[0099] The SIB is broadcast periodically by the UAV base station, without any request from the target UE. As long as the target UE is within the signal coverage of the UAV base station, it can receive the SIB broadcast by the UAV base station. The SIB is used by the UAV base station to broadcast important system configuration information to all UEs in the cell.

[0100] In this embodiment, when the unmanned aerial vehicle base station sends the first message to the target UE through the SIB, it can ensure that all UEs in the target area can receive the first message, and the unmanned aerial vehicle base station does not need to send the first message separately to each target UE, which effectively reduces the signaling overhead and is suitable for a wide range of network configurations or message transmission.

[0101] Among them, downlink control information (DCI) is control information transmitted through the physical downlink control channel (PDCCH).

[0102] It should be noted that the unmanned aerial vehicle base station can send the first message to all target UEs in the target area at the same time through DCI, or can send the first message to each target UE in the target area separately through DCI.

[0103] The unmanned aerial vehicle base station can send the first message N times to the target UE through the downlink control information DCI to ensure that even if some target UEs do not receive the first message in a certain time slot, they can still receive the first message in the subsequent DCI transmission, thereby ensuring that all target UEs in the target area can receive the first message.

[0104] Specifically, N is a positive integer, and N≥1.

[0105] In this embodiment, the UAV base station sends the first message to the target UE multiple times through DCI to ensure that all UEs in the target area can receive the first message, which is suitable for scenarios requiring immediate and precise control.

[0106] Among them, the Media Access Control Control Element (MACCE) is a type of control information transmitted through the MAC layer.

[0107] It should be noted that the UAV base station can send the first message to the target UE via a dedicated MAC CE.

[0108] Specifically, to identify the dedicated MAC CE used to send the first message to the target UE, the UAV base station may allocate a new logical channel identifier (LCH ID) to the dedicated MAC CE. The LCH ID is used to uniquely identify the dedicated MAC CE to ensure that the target UE can correctly process and distinguish the first message carried by the dedicated MAC CE.

[0109] Similar to the method in the above embodiment where the UAV base station sends the first message to the target UE via DCI, the UAV base station can ensure that all target UEs in the target area can receive the first message in a timely manner by transmitting dedicated MAC CE multiple times.

[0110] In the above embodiment, no matter the UAV base station sends the first message to the target UE through SIB, DCI or dedicated MAC CE, the first message can be a Boolean field or a choice field, and this embodiment does not make specific limitations on this.

[0111] A Boolean field is used to indicate whether to perform a certain operation. For example, whether to trigger RLF or whether to retain the first C-RNTI. A choice field provides multiple options, and the target UE can select different configurations based on the value of the choice field.

[0112] In the above embodiment, the target UE does not trigger RLF based on the first message, retains the first C-RNTI, and records the identification information corresponding to the target cell. Next, the method after the target UE retains the first C-RNTI and records the identification information corresponding to the target cell is described in detail.

[0113] Figure 9 A flow chart of another method for managing the connection of an unmanned aerial vehicle base station provided in an embodiment of the present application. Figure 9 As shown, in a possible embodiment, after the method steps shown in Sa1, the method further includes Sa2 to Sa6, which are described in detail below.

[0114] Sa2. The target UE performs wireless signal coverage detection after the second moment.

[0115] Sa3. When the target UE detects wireless signal coverage after the second moment, the target UE determines the third identification information corresponding to the third cell.

[0116] Among them, the third cell is the cell actually managed by the unmanned aerial vehicle base station when the unmanned aerial vehicle provides wireless signal coverage in the target area next time; the third identification information is the CGI and / or PCI of the third cell.

[0117] It should be noted that the method by which the target UE determines the third identification information corresponding to the third cell is similar to the method by which the target UE determines the first identification information corresponding to the first cell in the above embodiment, and will not be repeated in this embodiment.

[0118] The third identification information may be consistent with the first identification information and the second identification information, or may be inconsistent with it.

[0119] For example, a user prepares UAVs A and B to alternately provide wireless signal coverage for target area F. While UAV A is providing wireless signal coverage for target area F, if UAV A's battery is about to run out and it needs to leave target area F for charging, the first identification information recorded by the target UE is the identification information of the cell managed by the UAV base station through UAV A. Later, while UAV A is charging, UAV B provides wireless signal coverage for target area F. At this time, the target UE detects wireless signal coverage again, and the third identification information determined by the target UE is the identification information of the cell managed by the UAV base station through UAV B. At this time, the first identification information and the third identification information are inconsistent.

[0120] For another example, the user prepares UAV A and UAV B to alternately provide wireless signal coverage for target area F. When UAV A provides wireless signal coverage for target area F, if UAV A's battery is about to run out and it needs to leave target area F for charging, the UAV base station indicates the second identification information to the target UE in target area F through a first message, and the target UE records the second identification information. The second identification information is the identification information of the cell managed by the UAV base station when UAV B provides wireless signal coverage for target area F. Afterwards, when UAV A is charging, UAV B provides wireless signal coverage for target area F. At this time, the target UE detects wireless signal coverage again, and the third identification information determined by the target UE is the identification information of the cell managed by the UAV base station through UAV B. At this time, the second identification information is consistent with the third identification information.

[0121] For another example, the user prepares UAV A and UAV B to alternately provide wireless signal coverage for target area F. When UAV A provides wireless signal coverage for target area F, if UAV A's battery is about to run out and it needs to leave target area F for charging, the UAV base station indicates the second identification information to the target UE in target area F through a first message, and the target UE records the second identification information. The second identification information is the identification information of the cell managed by the UAV base station when UAV B provides wireless signal coverage for target area F. Afterwards, when UAV A is charging and UAV B is still providing wireless signal coverage for target area F, UAV C that accidentally enters target area F provides wireless signal coverage for target area F. At this time, the target UE detects wireless signal coverage again, and the third identification information determined by the target UE is the identification information of the cell managed by the UAV base station through UAV C. At this time, the second identification information is inconsistent with the third identification information.

[0122] Sa4. The target UE determines whether the third identification information is consistent with the identification information corresponding to the target cell.

[0123] It should be noted that, when the target UE records the first identification information based on the first message, after determining the third identification information, the target UE determines whether the third identification information is consistent with the first identification information. If the third identification information is consistent with the first identification information, the target UE executes the method steps shown in Sa5; if the third identification information is inconsistent with the first identification information, the target UE executes the method steps shown in Sa6.

[0124] When the target UE records the second identification information based on the first message, after determining the third identification information, the target UE determines whether the third identification information is consistent with the second identification information. If the third identification information is consistent with the second identification information, the target UE executes the method steps shown in Sa5; if the third identification information is inconsistent with the second identification information, the target UE executes the method steps shown in Sa6.

[0125] Sa5. When the third identification information is consistent with the identification information corresponding to the target cell, the target UE sends a second message to the unmanned aerial vehicle base station.

[0126] The second message is used to request the unmanned aerial vehicle base station to re-establish the radio resource control RRC connection with the target UE, or to indicate the first C-RNTI to the unmanned aerial vehicle base station.

[0127] The second message carries the first C-RNTI.

[0128] In one embodiment of the present application, the second message may be an RRC re-establishment request initiated by the target UE to the unmanned aerial vehicle base station to request the unmanned aerial vehicle base station to re-establish a connection with the target UE.

[0129] Specifically, the second message carries the first C-RNTI, so that the unmanned aerial vehicle base station can quickly re-establish the RRC connection between the unmanned aerial vehicle base station and the target UE based on the first C-RNTI, avoiding the unmanned aerial vehicle base station from reallocating a new C-RNTI to the target UE, thereby saving signaling overhead.

[0130] In another embodiment of the present application, the second message may be a simple indication information, used to indicate the first C-RNTI to the unmanned aerial vehicle base station so that the unmanned aerial vehicle base station can quickly restore the network connection of the target UE based on the first C-RNTI reported by the target UE.

[0131] Sa6. When the third identification information is inconsistent with the identification information corresponding to the target cell, the target UE deletes the first C-RNTI and the identification information corresponding to the target cell.

[0132] It should be noted that if the third identification information is inconsistent with the first identification information, or if the third identification information is inconsistent with the second identification information, the first C-RNTI will no longer be applicable to the target UE's RRC connection re-establishment. Therefore, the target UE releases the identification information corresponding to the first C-RNTI and the target cell to ensure that the target UE can correctly recycle and reallocate resources when it no longer uses the expired first C-RNTI. This helps to improve the stability and reliability of the communication system, optimize the management of network resources, enhance the flexibility of the system, and thus improve the user's communication experience and the overall performance of the network.

[0133] In this embodiment, when the target UE detects wireless signal coverage again after a preset time period, the target UE determines whether to continue using the first C-RNTI to reestablish the RRC connection based on the consistency of the third identification information with the first identification information or the second identification information. If the third identification information is consistent with the first identification information or the second identification information, the target UE will use the first C-RNTI to restore the connection, avoiding the process of the UAV base station re-allocating a C-RNTI to the target UE, reducing signaling overhead and improving the efficiency of connection recovery.

[0134] In the above embodiment, the first message is further used to indicate a first timer duration, which is used to indicate the duration for which the target UE retains the first C-RNTI and records the first identification information or the second identification information. Next, a method for the target UE to retain the first C-RNTI and the first identification information or the second identification information based on the first timer duration is described in detail.

[0135] In a possible embodiment, after the method step shown in Sa1, the method further includes Sc1 and Sc2, which are described in detail below.

[0136] Sc1. The target UE starts a timer.

[0137] The timing duration of the timer is a first timing duration, and the first timing duration is used to indicate the duration for which the target UE retains the first C-RNTI.

[0138] It should be noted that when the target UE receives the first message sent by the unmanned aerial vehicle base station and the first message indicates the first timing duration, the target UE starts the timer at the second moment and sets the timing duration of the timer to the first timing duration.

[0139] When the target UE starts the timer at the second moment, the target UE executes the method steps shown in Sa2 above.

[0140] Sc2. When the timer expires and no wireless signal coverage is detected, the target UE deletes the first C-RNTI and the first identification information or the second identification information.

[0141] It should be noted that within the timing duration of the timer, if the target UE detects wireless signal coverage, the target UE executes the method steps shown in Sa3 to Sa6 above; if the target UE does not detect wireless signal coverage, the target UE deletes the retained first C-RNTI, as well as the first identification information or the second identification information.

[0142] In this embodiment, a timer is started after the target UE receives the first message. The timing duration of the timer is the first timing duration indicated by the first message. The first timing duration is used to indicate the duration for which the target UE retains the first C-RNTI and the first identification information or the second identification information. When the timer expires and no wireless signal coverage is detected, the target UE deletes the first C-RNTI and the first identification information or the second identification information, ensuring that the target UE releases resources in a timely manner when the signal cannot be restored, thereby optimizing the utilization of network resources, reducing unnecessary identifier occupation, improving the resource management efficiency of the network, and preventing system burden or potential connection problems caused by expired C-RNTI.

[0143] Figure 10 This is a schematic diagram of the structure of an unmanned aerial vehicle base station provided in an embodiment of the present application. Figure 10 As shown, the UAV base station 1000 provided in this embodiment is used to implement the operations corresponding to the UAV base station in the above method embodiments.

[0144] The UAV base station 1000 may include a transceiver module 1001 and a processing module 1002. The processing module 1002 is used to process data, and the transceiver module 1001 may implement corresponding communication functions. The transceiver module 1001 may also be referred to as a communication interface or a communication unit.

[0145] Optionally, the unmanned aerial vehicle base station 1000 may also include a storage unit, which can be used to store instructions and / or data. The processing module 1002 can read the instructions and / or data in the storage unit so that the unmanned aerial vehicle base station 1000 implements the steps implemented by the unmanned aerial vehicle base station in the aforementioned method embodiment.

[0146] The transceiver module 1001 is used to perform reception-related operations of the UAV base station in the above method embodiment, and the processing module 1002 is used to perform processing-related operations of the UAV base station in the above method embodiment.

[0147] Optionally, the transceiver module 1001 may include a sending module and a receiving module. The sending module is used to perform the sending operation in the above method embodiment. The receiving module is used to perform the receiving operation in the above method embodiment.

[0148] It should be noted that the UAV base station 1000 may include a sending module but not a receiving module. Alternatively, the UAV base station 1000 may include a receiving module but not a sending module. The specific implementation depends on whether the above-mentioned solution executed by the UAV base station 1000 includes both sending and receiving actions.

[0149] As an example, the UAV base station 1000 is used to perform the above Figure 3 Actions performed by the UAV base station in the illustrated embodiment.

[0150] The UAV base station 1000 may include: a transceiver module 1001 and a processing module 1002 .

[0151] Processing module 1002 is configured to determine a first message, where the first message is used to indicate to a target user equipment UE that there is no wireless signal coverage in a target area within a preset time period, and to instruct the target UE not to trigger a radio link failure (RLF), retain the first cell temporary user identity (C-RNTI) allocated to the target UE by the entity in which the first cell is located, and record identification information corresponding to the target cell; wherein the target area is an area where the unmanned aerial vehicle currently provides wireless signal coverage, and the unmanned aerial vehicle is communicatively connected to the unmanned aerial vehicle base station; the target UE is a UE connected to the unmanned aerial vehicle base station within the target area; and the first cell is a cell currently managed by the unmanned aerial vehicle base station. The transceiver module 1001 is configured to send a first message to the target UE at a first moment, so that the target UE does not trigger an RLF based on the first message, retains the first C-RNTI, and records the identification information corresponding to the target cell; wherein the first moment is before the start time of a preset time period, and the identification information corresponding to the target cell is the cell global identifier CGI and / or physical cell identifier PCI of the target cell.

[0152] It should be understood that the execution of the above corresponding processes by each module has been described in detail in the above method embodiment, and for the sake of brevity, it will not be repeated here.

[0153] The processing module 1002 in the above embodiments can be implemented by at least one processor or processor-related circuits. The transceiver module 1001 can be implemented by a transceiver or transceiver-related circuits. The transceiver module 1001 can also be referred to as a communication unit or communication interface. The storage unit can be implemented by at least one memory.

[0154] Figure 11 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. Figure 11 As shown, the electronic device 1100 provided in this embodiment includes: a memory 1101 and a processor 1102.

[0155] Memory 1101 may be an independent physical unit, connected to processor 1102 via bus 1103. Memory 1101 and processor 1102 may also be integrated and implemented via hardware. Memory 1101 is used to store program instructions, which processor 1102 invokes to execute the operations performed by the UAV base station in any of the above method embodiments.

[0156] Optionally, when part or all of the methods of the above embodiments are implemented via software, the electronic device 1100 may include only a processor 1102. A memory 1101 for storing programs is located outside the electronic device 1100. The processor 1102 is connected to the memory via circuits / wires to read and execute the programs stored in the memory. The processor 1102 may be a central processing unit (CPU), a network processor (NP), or a combination of a CPU and an NP. The processor 1102 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The PLD may be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a generic array logic (GAL), or any combination thereof.

[0157] The memory 1101 may include a volatile memory, such as a random-access memory (RAM); the memory may also include a non-volatile memory, such as a flash memory, a hard disk drive (HDD), or a solid-state drive (SSD); the memory may also include a combination of the above types of memory.

[0158] Illustratively, the present application provides a chip comprising: an interface circuit and a logic circuit, wherein the interface circuit is used to receive signals from other chips outside the chip and transmit them to the logic circuit, or to send signals from the logic circuit to other chips outside the chip, and the logic circuit is used to execute the operations performed by the unmanned aerial vehicle base station in the above method embodiment.

[0159] Illustratively, the present application provides a computer-readable storage medium having computer program instructions stored thereon. The computer program instructions are executed by a processor of an electronic device so that the electronic device executes the operations performed by the unmanned aerial vehicle base station in the above method embodiment.

[0160] Illustratively, the present application provides a computer program product. When the computer program product is run on an electronic device, the electronic device executes the operations performed by the unmanned aerial vehicle base station in the above method embodiment.

[0161] The above are merely specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to these embodiments herein, but is intended to be construed in the broadest manner consistent with the principles and novel features disclosed herein.

Claims

1. A connection management method for an unmanned aerial vehicle base station, characterized in that: The method comprises: The unmanned aerial vehicle base station determines a first message, where the first message is used to indicate to a target user equipment UE that there is no wireless signal coverage in a target area within a preset time period, and to instruct the target UE not to trigger a radio link failure (RLF), retain the first cell temporary user identity (C-RNTI) allocated to the target UE by the entity where the first cell is located, and record the identification information corresponding to the target cell; wherein the target area is an area in which the unmanned aerial vehicle provides wireless signal coverage this time, and the unmanned aerial vehicle is communicatively connected to the unmanned aerial vehicle base station; the target UE is a UE connected to the unmanned aerial vehicle base station in the target area; and the first cell is a cell currently managed by the unmanned aerial vehicle base station. The unmanned aerial vehicle base station sends a first message to the target UE at a first moment, so that the target UE does not trigger RLF based on the first message, retains the first C-RNTI, and records the identification information corresponding to the target cell; wherein, the first moment is before the start time of the preset time period, and the identification information corresponding to the target cell is the cell global identifier CGI and / or physical cell identifier PCI of the target cell.

2. The method according to claim 1, characterized in that The target cell is the first cell or the second cell, and the second cell is the cell that the UAV base station expects to manage when the UAV provides wireless signal coverage in the target area next time; When the target cell is the first cell, the first message is used to instruct the target UE to record first identification information corresponding to the first cell, where the first identification information is the CGI and / or PCI of the first cell; In the case where the target cell is the second cell, the first message is used to instruct the target UE to record second identification information corresponding to the second cell, where the second identification information is the CGI and / or PCI of the second cell.

3. The method according to claim 1, characterized in that The first message is further used to indicate a first timing duration, where the first timing duration is used to instruct the target UE to retain the first C-RNTI and record the duration of the identification information corresponding to the target cell.

4. The method according to claim 1, wherein The unmanned aerial vehicle base station sends a first message to the target UE via a system information block SIB, downlink control information DCI or a media access control layer control element MAC CE.

5. A connection management method for an unmanned aerial vehicle base station, characterized in that: The method comprises: The target user equipment UE receives a first message sent by the unmanned aerial vehicle base station, where the first message is sent by the unmanned aerial vehicle base station at a first moment, and is used to indicate to the target UE that there is no wireless signal coverage in the target area within the preset time period, and to instruct the target UE not to trigger a radio link failure RLF, retain the first cell temporary user identity C-RNTI allocated to the target UE by the entity where the first cell is located, and record the identification information corresponding to the target cell; wherein the first moment is before the start moment of the preset time period, the target area is the area where the unmanned aerial vehicle provides wireless signal coverage this time, and the unmanned aerial vehicle is communicatively connected to the unmanned aerial vehicle base station; the target UE is a UE connected to the unmanned aerial vehicle base station in the target area; and the first cell is the cell managed by the unmanned aerial vehicle base station this time; Based on the first message, the target UE does not trigger RLF, retains the first C-RNTI, and records the identification information corresponding to the target cell; wherein the identification information corresponding to the target cell is the cell global identifier CGI and / or physical cell identifier PCI of the target cell.

6. The method according to claim 5, characterized in that The target cell is the first cell or the second cell, and the second cell is the cell that the UAV base station expects to manage when the UAV provides wireless signal coverage in the target area next time; In a case where the target cell is the first cell, the target UE records first identification information corresponding to the first cell, where the first identification information is the CGI and / or PCI of the first cell; In the case that the target cell is the second cell, the target UE records second identification information corresponding to the second cell, where the second identification information is the CGI and / or PCI of the second cell.

7. The method according to claim 5, characterized in that After the target UE does not trigger RLF based on the first message, retains the first C-RNTI, and records identification information corresponding to the target cell, the method further includes: When the target UE detects wireless signal coverage after the second moment, the target UE determines third identification information corresponding to a third cell; wherein the third cell is the cell actually managed by the unmanned aerial vehicle base station when the unmanned aerial vehicle provides wireless signal coverage in the target area next time; the third identification information is the CGI and / or PCI of the third cell; and the second moment is the starting moment of the preset time period; When the third identification information is consistent with the identification information corresponding to the target cell, the target UE sends a second message to the unmanned aerial vehicle base station, where the second message is used to request the unmanned aerial vehicle base station to re-establish the radio resource control RRC connection with the target UE, or to indicate the first C-RNTI to the unmanned aerial vehicle base station; wherein the second message carries the first C-RNTI.

8. The method according to claim 5, characterized in that After the target UE does not trigger RLF based on the first message, retains the first C-RNTI, and records identification information corresponding to the target cell, the method further includes: The target UE starts a timer, where the timing duration of the timer is a first timing duration, where the first timing duration is used to indicate a duration for which the target UE retains the identification information corresponding to the first C-RNTI and the target cell; When the timer times out and no wireless signal coverage is detected, the target UE deletes the identification information corresponding to the first C-RNTI and the target cell.

9. An unmanned aerial vehicle base station, characterized in that: include: memory and processor; The memory is configured to store computer program instructions; The processor is configured to execute the computer program instructions so that the UAV base station implements the method according to any one of claims 1 to 4.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed, the method according to any one of claims 1 to 8 is implemented.

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