WO2021016894A1

WO2021016894A1 - Cell reselection method and unmanned aerial vehicle terminal

Info

Publication number: WO2021016894A1
Application number: PCT/CN2019/098458
Authority: WO
Inventors: 尤心; 卢前溪
Original assignee: Oppo广东移动通信有限公司
Priority date: 2019-07-30
Filing date: 2019-07-30
Publication date: 2021-02-04
Also published as: CN113475117A

Abstract

Provided are a cell reselection method and an unmanned aerial vehicle terminal. The method comprises: acquiring altitude information for at least one candidate cell; determining a target cell from the at least one candidate cell according to the altitude information and the flight mode of an unmanned aerial vehicle terminal; and performing cell reselection on the basis of the target cell. On the basis of the technical solution, the introduction of altitude information for at least one candidate cell into a cell reselection process of an unmanned aerial vehicle terminal enables the unmanned aerial vehicle terminal to preferentially select the cell having the largest altitude coverage interval during cell reselection according to different flight modes, so as to avoid frequent cell reselection due to the flight process and prolong the capping duration in a reselected cell, such that the time for connection establishment is guaranteed, and the probability of establishment failure due to cell reselection during connection establishment is reduced, thereby improving the success rate of data transmission and user experience.

Description

Method for reselecting cell and drone terminal

Technical field

The embodiments of the present application relate to the communication field, and more specifically, to a method for reselecting a cell and a drone terminal.

Background technique

At present, in order to meet people's pursuit of speed, delay, high-speed mobility, and energy efficiency, as well as people's needs for diversification and complexity of services in future life, the 3GPP International Standards Organization has begun to develop 5G. The main application scenarios of 5G are: enhanced mobile ultra-broadband (eMBB), low-latency and highly reliable communication (URLLC), and large-scale machine-type communication (mMTC).

In addition, Unmanned Aerial Vehicle (UAV) is referred to as UAV terminal for short. Its global market has grown substantially in the past decade and has now become an important tool for commercial, government and consumer applications. UAVs can support solutions in many fields, and can be widely used in construction, oil, natural gas, energy, utilities, and agriculture. At present, drone technology is developing rapidly in the direction of military-civilian integration. The drone industry has become the most dynamic emerging market in international aerospace and has become a bright spot in the economic growth of various countries.

However, the current 5G cell deployment mainly serves terminal equipment on the ground, and the network coverage is mainly a two-dimensional space on the ground. After the introduction of UAV terminals, since UAVs can be launched into the air, UAV communication requires network deployment at a certain height. Based on this, the network deployment method is to increase new network coverage for different heights.

If the UAV terminal only considers existing measured values such as RSRP/RSRQ during the cell reselection process, it may cause frequent cell reselection processes. In addition, if the UAV terminal is reselecting a cell when the data transmission connection is established, it will cause the connection establishment to terminate or fail, which will increase the data transmission delay and even cause the data transmission to fail, reducing the success rate of data transmission and user experience.

Summary of the invention

A method for reselecting a cell and a drone terminal are provided, which can improve the success rate of data transmission and user experience.

In the first aspect, a method for cell reselection is provided, including:

Acquiring height information for at least one candidate cell;

Determining a target cell from the at least one candidate cell according to the altitude information and the flight mode of the drone terminal;

Perform cell reselection based on the target cell.

In the second aspect, an unmanned aerial vehicle terminal is provided, which is used to execute the method in the above-mentioned first aspect or its implementation manners. Specifically, the UAV terminal includes a functional module for executing the method in the above-mentioned first aspect or each implementation manner thereof.

In the third aspect, an unmanned aerial vehicle terminal is provided, which includes a processor and a memory. The memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the method in the foregoing first aspect or each of its implementation manners.

In a fourth aspect, a chip is provided, which is used to implement the method in the first aspect or its implementation manners. Specifically, the chip includes: a processor, configured to call and run a computer program from the memory, so that the device installed with the chip executes the method in the above-mentioned first aspect or its implementation manners.

In a fifth aspect, a computer-readable storage medium is provided for storing a computer program that enables a computer to execute the method in the first aspect or its implementation manners.

In a sixth aspect, a computer program product is provided, including computer program instructions, which cause a computer to execute the method in the first aspect or its implementation manners.

In a seventh aspect, a computer program is provided, which when running on a computer, causes the computer to execute the method in the first aspect or its implementation manners.

Based on the above technical solution, by introducing the altitude information for at least one candidate cell to the UAV terminal's cell reselection process, the UAV terminal can give priority to selecting the largest coverage height interval during cell reselection according to different flight modes. The cell avoids frequent cell reselection due to the flight process, increases the time to stay in the reselected cell, thus provides time guarantee for connection establishment, and reduces the failure of cell reselection during the connection establishment process Probability, thereby improving the success rate of data transmission and user experience.

Description of the drawings

Figure 1 is an example of the application scenario of this application.

FIG. 2 is a schematic flowchart of a cell reselection method according to an embodiment of the present application.

3 to 5 are schematic block diagrams of the coverage area of the first candidate cell, the coverage area of the second candidate cell, and the position relationship of the drone terminal in the embodiments of the present application.

Fig. 6 is a schematic block diagram of a drone terminal according to an embodiment of the present application.

Fig. 7 is a schematic block diagram of a communication device according to an embodiment of the present application.

FIG. 8 is a schematic block diagram of a chip of an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are a part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

Fig. 1 is a schematic diagram of an application scenario of an embodiment of the present application.

As shown in FIG. 1, the communication system 100 may include a terminal device 110 and a network device 120. The network device 120 may communicate with the terminal device 110 through an air interface. The terminal device 110 and the network device 120 support multi-service transmission.

It should be understood that the embodiment of the present application only uses the communication system 100 for exemplary description, but the embodiment of the present application is not limited thereto. In other words, the technical solutions of the embodiments of the present application can be applied to various communication systems, such as: Long Term Evolution (LTE) system, LTE Time Division Duplex (TDD), Universal Mobile Communication System (Universal Mobile Telecommunication System, UMTS), 5G communication system (also known as New Radio (NR) communication system), or future communication system, etc.

In the communication system 100 shown in FIG. 1, the network device 120 may be an access network device that communicates with the terminal device 110. The access network device can provide communication coverage for a specific geographic area, and can communicate with terminal devices 110 (for example, UE) located in the coverage area.

Optionally, the network device 120 may be an evolved base station (Evolutional Node B, eNB or eNodeB) in a Long Term Evolution (LTE) system, or a next generation radio access network (Next Generation Radio Access Network, NG RAN) device, or a base station (gNB) in an NR system, or a wireless controller in a cloud radio access network (Cloud Radio Access Network, CRAN), or the network device 120 may be a relay station, an access point, In-vehicle devices, wearable devices, hubs, switches, bridges, routers, or network devices in the future evolution of the public land mobile network (Public Land Mobile Network, PLMN), etc.

Optionally, the terminal device 110 may be any drone terminal device, including but not limited to: a terminal device connected to the network device 120 or other terminal devices in a wired or wireless connection. Terminal equipment can refer to access terminals, user equipment (UE), user units, user stations, mobile stations, mobile stations, remote stations, remote terminals, mobile equipment, user terminals, terminals, wireless communication equipment, user agents, or User device. The access terminal can be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, a personal digital processing (Personal Digital Assistant, PDA), with wireless communication Functional handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in 5G networks or terminal devices in future evolution networks, etc.

Optionally, device-to-device (D2D) communication may be performed between the terminal devices 110.

The wireless communication system 100 may also include a core network device 130 that communicates with a base station. The core network device 130 may be a 5G core network (5G Core, 5GC) device, for example, access and mobility management function (Access and Mobility Management Function). , AMF), for example, authentication server function (Authentication Server Function, AUSF), for example, user plane function (User Plane Function, UPF), for example, session management function (Session Management Function, SMF). Optionally, the core network device 130 may also be an Evolved Packet Core (EPC) device of the LTE network, for example, a session management function + a data gateway (Session Management Function+Core Packet Gateway, SMF+PGW-) of the LTE network. C) Equipment. It should be understood that SMF+PGW-C can simultaneously realize the functions that SMF and PGW-C can realize. In the process of network evolution, the aforementioned core network equipment may also be called by other names, or a new network entity may be formed by dividing the functions of the core network, which is not limited in the embodiment of the present application.

In a specific example, each functional unit in the communication system 100 may establish a connection through a next generation network (NG) interface to implement communication.

For example, the terminal equipment establishes an air interface connection with the access network equipment through the NR interface to transmit user plane data and control plane signaling; the terminal equipment can establish a control plane signaling connection with the AMF through the NG interface 1 (abbreviated as N1); access Network equipment such as the next generation wireless access base station (gNB) can establish a user plane data connection with UPF through NG interface 3 (abbreviated as N3); access network equipment can establish control plane signaling with AMF through NG interface 2 (abbreviated as N2) Connection; UPF can establish a control plane signaling connection with SMF through NG interface 4 (N4 for short); UPF can exchange user plane data with the data network through NG interface 6 (N6 for short); AMF can communicate with SMF through NG interface 11 (N11 for short) SMF establishes control plane signaling connection; SMF can establish control plane signaling connection with PCF through NG interface 7 (abbreviated as N7). It should be noted that the part shown in Figure 2 is only an exemplary architecture diagram. In addition to the functional units shown in Figure 1, the network architecture may also include other functional units or functional entities, such as: core network equipment may also Other functional units such as unified data management (UDM) are included, which are not specifically limited in the embodiment of the present application.

FIG. 1 exemplarily shows a base station, a core network device and two terminal devices. Optionally, the wireless communication system 100 may include multiple base station devices and the coverage of each base station may include other numbers of terminals The device is not limited in this embodiment of the application.

It should be understood that all devices with communication functions in the network/system in the embodiments of the present application can be referred to as communication devices. Taking the communication system 100 shown in FIG. 1 as an example, the communication device may include a network device 120 and a terminal device 110 having communication functions, and the network device 120 and the terminal device 110 may be the above-mentioned devices, which will not be repeated here; The communication device may also include other devices in the communication system 100, such as other network entities such as a network controller and a mobility management entity, which are not limited in the embodiment of the present application.

It should be understood that the terms "system" and "network" in this article are often used interchangeably in this article. The term "and/or" in this article is only an association relationship describing associated objects, which means that there can be three relationships, for example, A and/or B, which can mean: A alone exists, A and B exist at the same time, exist alone B these three situations. In addition, the character "/" in this text generally indicates that the associated objects before and after are in an "or" relationship.

Taking the 5G communication system as an example, in the 5G network environment, for the purpose of reducing air interface signaling, quickly restoring wireless connections, and quickly restoring data services, a new RRC state, that is, the RRC_INACTIVE state, is defined. This state is different from the RRC_IDLE and RRC_ACTIVE states.

For RRC_IDLE, there is no RRC connection. Mobility is based on UE-based cell selection and reselection, paging is initiated by the core network (CN), and the paging area is configured by the CN. There is no UE AS context on the network device side.

For RRC_CONNECTED, there is an RRC connection, and there is a UE AS context between the network device and the UE. The network equipment side knows that the location of the UE is of a specific cell level. Mobility is the mobility controlled by the network side. Unicast data can be transmitted between the UE and network equipment.

For RRC_INACTIVE, mobility is UE-based cell selection and reselection, there is a connection between CN-NR, UE AS context is stored on a certain network device, paging is triggered by RAN, and RAN-based paging area is managed by RAN. The device side knows that the location of the UE is based on the paging area level of the RAN.

Currently, cell deployment in 5G mainly serves terminal equipment on the ground, and the network coverage is mainly two-dimensional space on the ground. After the introduction of UAV terminals, since UAVs can be launched into the air, UAV communication requires network deployment at a certain height. Based on this, the network deployment method is to increase new network coverage for different heights.

However, if the UAV terminal only considers existing measurement values such as RSRP/RSRQ during the cell reselection process, it may cause frequent cell reselection processes. In addition, if the UAV terminal is reselecting a cell when the data transmission connection is established, it will cause the connection establishment to terminate or fail, which will increase the data transmission delay and even cause the data transmission to fail, reducing the success rate of data transmission and user experience. For example, different movement modes of drones (such as take-off, flying, landing, etc.) pose problems for cell reselection.

This application provides a method for reselecting a cell and a drone terminal, which can improve the success rate of data transmission and user experience.

FIG. 2 shows a schematic flowchart of a method 200 for cell reselection according to an embodiment of the present application. The method 200 may be executed by a terminal device. The terminal device shown in FIG. 2 may be the terminal device 110 shown in FIG. 1.

As shown in FIG. 2, the method 200 includes:

S210: The drone terminal obtains height information for at least one candidate cell.

S220: The drone terminal determines a target cell in the at least one candidate cell according to the altitude information and the flight mode of the drone terminal.

S230: The drone terminal performs cell reselection based on the target cell.

For example, after the UAV terminal obtains cell height information of the serving cell and/or neighboring cells, it determines at least one cell that meets the cell selection criterion (for example, the S criterion) as the at least one candidate cell based on the channel measurement result; After the drone terminal has screened out the at least one candidate cell, it acquires the altitude information for the at least one candidate cell in the cell height information, based on the flight mode of the drone terminal and the altitude information The target cell is determined in the at least one candidate cell, and camps on the target cell to complete the cell reselection process.

By introducing the altitude information for at least one candidate cell into the cell reselection process of the UAV terminal, the UAV terminal can preferentially select the cell with the largest coverage interval during cell reselection according to different flight modes. The frequent cell reselection caused by the flight process increases the time to stay in the reselected cell, thereby providing time guarantee for connection establishment, reducing the probability of establishment failure due to cell reselection during the connection establishment process, thereby increasing The success rate of data transmission and user experience.

In some embodiments of the present application, the at least one candidate cell includes a serving cell of the drone terminal and/or at least one neighboring cell of the serving cell.

In some embodiments of the present application, the height information includes at least one of the following information:

The upper limit height of coverage of each cell in the at least one candidate cell;

The lower limit height of the coverage of each cell in the at least one candidate cell; and

The height of the network device to which the at least one candidate cell belongs.

For example, the height information may include the coverage in the height direction of each candidate cell in the at least one candidate cell, or the height information may include the height interval covered by each candidate cell in the at least one candidate cell.

It should be understood that the height of the network device may be the height of a certain component of the network device, and the height of the network device may be the height of the network device in the vertical direction, for example Altitude, the height of a location that does not include latitude and longitude information, or the height of a location that includes longitude and latitude information.

In some embodiments of the present application, each candidate cell of the at least one candidate cell satisfies the cell selection criterion, so as to ensure that the signal quality of the drone terminal after camping on the target cell is sufficiently good.

For example, the at least one candidate cell may include at least one low-priority inter-frequency cell and/or at least one high-priority inter-frequency cell satisfying a cell selection criterion.

In other words, the at least one candidate cell may include at least one inter-frequency cell (also referred to as a low-priority inter-frequency cell) whose frequency priority is lower than the frequency priority of the serving cell; and/or, the frequency priority At least one inter-frequency cell (also referred to as a high-priority inter-frequency cell) that is higher than the frequency priority of the serving cell.

For another example, the at least one candidate cell may include at least one same-frequency cell and/or at least one same-priority inter-frequency cell.

In other words, the at least one candidate cell may include at least one inter-frequency cell with a frequency priority equal to that of the serving cell (also referred to as an inter-frequency cell with the same priority); and/or, the frequency is equal to the serving cell The same frequency cell (also called the same frequency cell) of the frequency point.

In order to facilitate the understanding of the solution of this application, the cell selection criteria are briefly introduced below.

For example, the cell selection criterion may be the S criterion.

The S criterion means: if Srxlev>0, stay in the cell. Srxlev calculation formula is as follows:

Srxlev=Qrxlevmeas-Qrxlevmin-Pcompensation;

Among them, Qrxlevmeas is the measured received power of the current serving cell, that is, the measured value of the cell P-CCPCH RSCP (dBm); Qrxlevmin is the minimum received power of the serving cell, that is, the minimum received level required by the cell (dBm), which can be obtained from the system Obtained directly from the broadcast message or converted based on the information obtained in the system broadcast message; Pcompensation is the compensation value.

Pcompensation can be calculated by the following formula:

Pcompensation=max(UE_TXP-WR_MAX_RACH-P_MAX, 0).

Among them, UE_TXPWR_MAX_RACH is the maximum transmit power value (dBm) allowed on the RACH channel when the terminal device accesses the cell, which is sent by the system broadcast message and is generally set to 0; P_MAX is the maximum transmit power (dBm) of the terminal.

It should be understood that the neighboring cells of the UAV terminal may include one or more, the serving cell of the UAV terminal may also include one or more, and the at least one candidate cell may be the UAV terminal. Cells satisfying the cell selection criterion (for example, the S criterion) are selected among neighboring cells and/or serving cells of the UAV terminal.

In other words, the UAV terminal selects a target cell that meets the cell reselection criterion among at least one candidate cell that meets the cell selection criterion (for example, the S criterion), and then camps on the target cell to complete the cell reselection process.

In order to further understand the solution of this application, the cell reselection solution will be briefly introduced below.

It should be noted that a target cell may be selected from at least one candidate cell that meets the cell selection criterion, and then a cell reselection process is performed based on the target cell. The cell reselection process is executed by the drone terminal in the IDLE state, or it can be executed by the drone terminal in the inactive state, which is not specifically limited in this application.

As an example, the reselection criterion may be an R criterion.

The following guidelines should be followed when reselecting cells with the same frequency and different frequencies with the same priority:

_{Rs = Q meas, s + Q} hyst -Qoffset temp.

Rn = Q _{meas, n} -Qoffset-Qoffset _temp .

Among them, Q _meas,s is the RSRP measurement value of the serving cell, Q _meas,n is the RSRP measurement of the neighboring cell, Qoffset is an offset value, Qoffset _temp is a temporary offset value, and Q _hyst is a hysteresis value.

If the network does not configure the strongest signal threshold (rangeToBestCell), the terminal device sorts the Rs and Rn values of the serving cell and neighboring cells, and selects the cell with the highest Rs/Rn ranking among the serving cell and many neighboring cells for cell reselection .

If the network is configured with rangeToBestCell, the UE reselects the cell with the largest number of beams among the highest-ranked cells defined by the parameter rangeToBestCell, and the good beam is defined by the absThreshSS-BlocksConsolidation threshold . If there are many such cells, the terminal device reselects the cell with the highest ranking.

Follow the following guidelines when reselecting high-priority inter-frequency cells:

If the system message broadcasts ThreshServingLowQ, when the RSRQ measurement value of a neighboring cell on the high priority frequency point meets the threshold value greater than Thresh _{X, HighQ} , the terminal device triggers the reselection process to the cell; otherwise, the high priority frequency point When the RSRP measurement value of a neighboring cell above satisfies the threshold value greater than Thresh _{X, HighP} , the UE triggers a reselection process to the cell.

Follow the following guidelines when reselecting low-priority inter-frequency cells:

If the system message broadcasts ThreshServingLowQ, when the serving cell RSRQ is less than Thresh _{Serving, LowQ} and the RSRQ measurement value of a neighboring cell on the low priority frequency meets the threshold value greater than Thresh _{X, HighQ} , the terminal device triggers a reselection to the cell Process; otherwise, when the RSRP of the serving cell is less than Thresh _{Serving, LowP} and the RSRP measurement value of a neighboring cell on the low priority frequency meets the threshold value greater than Thresh _{X, HighP} , the UE triggers a reselection process to the cell.

In some embodiments of the present application, the flight mode of the drone terminal may include at least one of the following:

Takeoff mode, horizontal flight mode, and landing mode.

Wherein, the take-off mode may mean that the height of the drone terminal is in a continuously rising state within a certain period of time, and the duration of the certain period of time may be less than or equal to a certain threshold. Similarly, the horizontal flight mode may refer to the range of fluctuations in the height of the drone terminal within a certain period of time less than a certain preset range, and the landing mode may refer to the height of the drone terminal. In a certain period of time in a continuous decline.

The implementation of the foregoing S220 will be described in detail below.

In S220, the drone terminal may determine a target cell in the at least one candidate cell according to the height information for the at least one candidate cell and the flight mode of the drone terminal.

In some embodiments of the present application, the drone terminal may determine the target cell in the at least one candidate cell directly based on the altitude information of the at least one candidate cell and the flight mode of the drone terminal, Avoid using additional information to be compatible with the cell reselection process in a two-dimensional space as much as possible.

Specifically, the target cell may be determined in the following manner:

1). If the UAV terminal is in the take-off mode, the UAV terminal may determine the cell with the largest upper limit height among the at least one candidate cell as the target cell; and/or, if the unmanned The drone terminal is in a take-off mode, and the drone terminal can determine the cell covered by the network device with the largest height among the at least one network device to which the at least one candidate cell belongs as the target cell.

FIG. 3 is a schematic block diagram of the coverage area of the first candidate cell, the coverage area of the second candidate cell, and the location relationship of the UAV terminal in the embodiment of the present application.

Referring to FIG. 3, the at least one candidate cell includes a first cell covered by the first network device 310 and a second cell covered by the second network device 320. If the lower limit height of the coverage of the second cell is The x-axis, with the vertical direction perpendicular to the x-axis as the z-axis, the lower limit height of the second cell is 0, the upper limit height of the second cell is z2, and the lower limit of the coverage of the first cell The height is z1, and the upper limit of the coverage of the first cell is z3. It can be found that the upper limit of the coverage of the first cell z3 is greater than the upper limit of the coverage of the second cell z2. If the drone terminal If the flight mode of 331 is the ascending mode, the target cell may be the first cell.

2). If the drone terminal is in the horizontal flight mode, the drone terminal may make the average value of the upper limit height and the lower limit height in the at least one candidate cell closest to the flying height of the drone terminal The cell of the at least one candidate cell is determined to be the target cell; and/or, if the drone terminal is in the horizontal flight mode, the drone terminal may determine the location of the at least one network device to which the at least one candidate cell belongs The cell covered by the network device whose altitude is closest to the flying altitude of the drone terminal is determined as the target cell.

FIG. 4 is a schematic block diagram of the coverage area of the first candidate cell, the coverage area of the second candidate cell, and the location relationship of the UAV terminal in the embodiment of the present application.

Referring to FIG. 4, the at least one candidate cell includes a first cell covered by the first network device 310 and a second cell covered by the second network device 320, if the lower limit height of the coverage of the second cell is The x-axis, with the vertical direction perpendicular to the x-axis as the z-axis, the lower limit height of the second cell is 0, the upper limit height of the second cell is z2, and the lower limit of the coverage of the first cell The height is z1, and the upper limit of the coverage of the first cell is z3. It can be found that the height of the first network device 310 is closest to the flying height of the drone terminal 332. The flight mode of the terminal 332 is a horizontal flight mode, and the target cell may be the first cell.

3). If the UAV terminal is in the landing mode, the UAV terminal may determine the cell with the smallest lower limit height among the at least one candidate cell as the target cell; and/or, if there is no The human-machine terminal is in the landing mode, and the UAV terminal may determine the cell covered by the network device with the smallest height among the at least one network device to which the at least one candidate cell belongs as the target cell.

FIG. 5 is a schematic block diagram of the coverage area of the first candidate cell, the coverage area of the second candidate cell, and the position relationship of the UAV terminal in the embodiment of the present application.

Referring to FIG. 5, the at least one candidate cell includes a first cell covered by the first network device 310 and a second cell covered by the second network device 320, if the lower limit height of the coverage of the second cell is The x-axis, with the vertical direction perpendicular to the x-axis as the z-axis, the lower limit height of the second cell is 0, the upper limit height of the second cell is z2, and the lower limit of the coverage of the first cell The height is z1, and the upper limit of the coverage of the first cell is z3. It can be found that the upper limit of the coverage of the first cell z3 is greater than the upper limit of the coverage of the second cell z2. If the drone terminal If the flight mode of 332 is the landing mode, the target cell may be the second cell.

Taking the at least one candidate cell including at least one high-priority frequency cell as an example, when at least one neighboring cell meets the reselection criterion (for example, the neighboring cell RSRQ measurement value is greater than Thresh _{X, the HighQ} threshold value or the neighboring cell RSRP measurement value is greater than Thresh _{X, HighP} threshold), if the drone terminal is in the take-off mode, the drone terminal can preferentially reselect to the cell with the largest upper limit height or the network device with the largest height. If the drone terminal is in the horizontal flight mode, the drone terminal can preferentially reselect to the cell covered by the network device whose altitude is closest to the current flight altitude of the drone terminal, Or the UAV terminal may preferentially reselect to the cell where the average value of the upper limit height and the lower limit height is closest to the current flying height of the UAV terminal; if the UAV terminal is in the landing mode, the none The human-machine terminal can reselect the cell with the smallest lower limit height or the cell covered by the network device with the smallest height.

Taking the at least one candidate cell including at least one low-priority frequency cell as an example, when at least one neighboring cell meets the reselection criterion (for example, the serving cell RSRQ is less than Thresh _{Serving, LowQ} and the neighboring cell RSRQ measurement value is greater than Thresh _{X, HighQ} gate Or when the RSRP of the serving cell is less than Thresh _{Serving, LowP} and the RSRP measurement value of neighboring cells is greater than Thresh _{X, HighP} threshold), if the drone terminal is in take-off mode, the drone terminal can Prioritize reselection to the cell with the largest upper limit height or the cell covered by the network equipment with the largest height; if the drone terminal is in the horizontal flight mode, the drone terminal can preferentially reselect to where it is The height closest to the current flying height of the drone terminal is the cell covered by the network equipment, or the drone terminal can be reselected to the upper limit and the lower limit of the average height closest to the drone terminal The cell with the current flying height; if the drone terminal is in the landing mode, the drone terminal may preferentially reselect to the cell with the smallest lower limit height or the cell covered by the network device with the smallest height.

Based on the above technical solutions, for UAV terminals in take-off mode or landing mode, the UAV terminal can be made to preferentially select the cell with the largest remaining coverage height to stay as long as possible on the premise that RSRP/RSRQ meets the requirements. Stay in the reselected cell to reduce the number of cell reselections, thereby reducing the impact on connection establishment. In the horizontal flight mode, selecting the cell with the height of the cell base station closest to that of the drone can maximize the time to reselect the cell to serve the drone and reduce the number of cell reselections and the probability of connection failure.

In some other embodiments of the present application, the UAV terminal may use pre-configured auxiliary parameters in the at least one candidate cell based on the height information of the at least one candidate cell and the UAV terminal The flight mode determines the target cell. For example, when the at least one candidate cell includes at least one low-priority inter-frequency cell and/or at least one high-priority inter-frequency cell satisfying the cell selection criteria, the drone terminal may determine the target cell by using auxiliary parameters. Wherein, the UAV terminal may obtain the auxiliary parameter through the system information including the auxiliary parameter, for example, the system information including the auxiliary information may be SIB3. The auxiliary parameter may be information acquired before the cell reselection process, or may be information acquired during the cell reselection process, which is not specifically limited in this application.

For example, the auxiliary parameter may include a threshold value of the strongest signal that the drone terminal can receive.

Wherein, the difference between the strongest signal quality of the at least one candidate cell and the signal quality of each candidate cell in the at least one candidate cell is less than the strongest signal threshold. For example, the strongest signal threshold may be the rangeToBestCell mentioned above.

In some embodiments of the present application, the height information further includes a first height threshold, and the difference between the maximum upper limit height of the at least one candidate cell and the upper limit height of each candidate cell in the at least one candidate cell is less than The first height threshold, and/or, the difference between the maximum height of the at least one network device to which the at least one candidate cell belongs and the height difference between each network device in the at least one network device is less than The first height threshold.

In other words, each of the at least one candidate cell can meet the coverage requirement of the UAV terminal in the take-off mode.

At this time, the drone terminal can determine the target cell in the following manner:

If the drone terminal is in the take-off mode, the drone terminal may determine the cell with the best signal quality among the at least one candidate cell as the target cell; and/or if the drone terminal In the take-off mode, the UAV terminal may determine the cell with the largest number of beams with beam quality greater than or equal to a preset threshold as the target cell; and/or, if the UAV terminal is in the take-off mode, The UAV terminal may determine the cell with the largest upper limit height among the at least one candidate cell as the target cell; and/or, if the UAV terminal is in take-off mode, the UAV terminal may The cell covered by the network device with the largest height in the at least one network device is determined as the target cell.

For example, if the UAV terminal is in the takeoff mode, the parameter first height threshold (rangeToHighestCell) may be used for screening among multiple neighboring cells that meet the S criterion. Specifically, the following implementation manners may be included:

1). Only use the parameter rangeToHighestCell to filter.

For example, a cell whose difference between the maximum upper limit height of a plurality of cells satisfying the cell selection criterion and the upper limit height is less than or equal to rangeToHighestCell is used as the at least one candidate cell. At this time, the target cell may be a cell satisfying the following conditions among the at least one candidate cell:

1. The cell with the best signal quality among the at least one candidate cell; and/or,

2. The cell with the highest coverage among the at least one candidate cell.

2). Use the parameters rangeToHighestCell and rangeToBestCell for joint screening.

For example, the difference between the maximum upper limit height of multiple cells satisfying the cell selection criterion and the upper limit height is less than or equal to rangeToHighestCell, and the maximum measurement value of signal quality in the multiple cells is compared with each of the multiple cells. A cell whose signal quality measurement value difference is less than or equal to rangeToBestCell is used as the at least one candidate cell. At this time, the target cell may be a cell satisfying the following conditions among the at least one candidate cell:

1. The cell with the largest number of beams whose measurement result is greater than the preset threshold.

If there are multiple cells with the largest number of beams whose measurement results are greater than the preset threshold, the target cell may be a cell that also meets the following conditions among the at least one candidate cell:

a. The cell with the best signal quality; and/or,

b. The cell with the largest ceiling height.

2. The cell with the best signal quality.

If there are multiple cells with the best signal quality, the target cell may be a cell that also meets the following conditions among the at least one candidate cell:

a. The cell with the largest number of beams whose measurement result is greater than the preset threshold; and/or,

b. The cell with the largest ceiling height.

3. The cell with the largest ceiling height.

If there are multiple cells with the largest upper limit height, the target cell may be a cell among the at least one candidate cell that also meets the following conditions:

a. The cell with the best signal quality; and/or,

b. The cell with the largest number of beams whose measurement result is greater than the preset threshold.

In some embodiments of the present application, the altitude information further includes a second altitude threshold, and the average value of the upper limit height and the lower limit height of each candidate cell in the at least one candidate cell and the flying height of the drone terminal The difference between is smaller than the second height threshold, and/or the difference between the height of each network device in the at least one network device to which the at least one candidate cell belongs and the flight height of the drone terminal Both are smaller than the second height threshold.

In other words, each of the at least one candidate cell can meet the coverage requirement of the drone terminal in the horizontal flight mode.

If the drone terminal is in the horizontal flight mode, the drone terminal may determine the cell with the best signal quality among the at least one candidate cell as the target cell; and/or if the drone The terminal is in the horizontal flight mode, and the UAV terminal may determine the cell with the largest number of beams with beam quality greater than or equal to the preset threshold as the target cell; and/or, if the UAV terminal is horizontal In the flight mode, the drone terminal may determine the cell whose average value of the upper limit height and the lower limit height in the at least one candidate cell is closest to the flying height of the drone terminal as the target cell; and/or If the drone terminal is in the horizontal flight mode, the drone terminal can set the height of the at least one network device to which the at least one candidate cell belongs closest to the flying height of the drone terminal The cell covered by the network equipment of is determined as the target cell.

For example, if the UAV terminal is in the horizontal flight mode, the second height threshold (rangeToCurrentHightCell) can be used for screening among multiple neighboring cells that meet the S criterion. There are several implementation manners:

1). Only use the parameter rangeToCurrentHightCell to filter.

For example, a cell whose height difference between at least one network device in at least one network device belonging to multiple cells that meets the cell selection criterion and the current flying height of the UAV terminal is less than or equal to rangeToCurrentHightCell is taken as the cell. At least one candidate cell. At this time, the target cell may be a cell satisfying the following conditions among the at least one candidate cell:

2. The at least one network device to which the at least one candidate cell belongs is in a cell covered by a network device whose height is closest to the current flying height of the drone.

2). Use the parameters rangeToCurrentHightCell and rangeToBestCell for joint screening.

For example, the difference between the height of each network device in at least one network device belonging to multiple cells that satisfy the cell selection criterion and the current flying height of the drone terminal is less than or equal to the rangeToCurrentHightCell, and A cell whose difference between the maximum measured value of signal quality in the multiple cells and the measured value of signal quality of each of the multiple cells is less than or equal to rangeToBestCell is used as the at least one candidate cell. At this time, the target cell may be a cell satisfying the following conditions among the at least one candidate cell:

a. The cell with the best signal quality; and/or,

b. The cell covered by the network equipment whose altitude is closest to the current flying altitude of the UAV terminal.

2. The cell with the best signal quality.

3. The cell covered by the network device whose altitude is closest to the current flying altitude of the UAV terminal.

If there are multiple cells covered by the network device whose altitude is closest to the current flying altitude of the drone terminal, the target cell may be a cell that also meets the following conditions among the at least one candidate cell:

a. The cell with the best signal quality; and/or,

In some embodiments of the present application, the height information further includes a third height threshold, and the difference between the lower limit height of each candidate cell in the at least one candidate cell and the minimum lower limit height of the at least one candidate cell is less than The third height threshold, and/or the difference between the height of each network device in the at least one network device to which the at least one candidate cell belongs and the minimum height of the at least one network device is less than The third height threshold.

In other words, each of the at least one candidate cell can meet the coverage requirement of the drone terminal in the landing mode.

If the drone terminal is in the landing mode, the drone terminal may determine the cell with the best signal quality among the at least one candidate cell as the target cell; and/or if the drone terminal In the landing mode, the UAV terminal may determine the cell with the largest number of beams with beam quality greater than or equal to the preset threshold as the target cell; and/or, if the UAV terminal is in the landing mode, The drone terminal may determine the cell with the smallest upper limit height among the at least one candidate cell as the target cell; and/or, if the drone terminal is in the landing mode, the drone terminal may The cell covered by the network device with the smallest height in the at least one network device is determined as the target cell.

For example, if the UAV terminal is in the landing mode, the third height threshold (rangeToLowestCell) can be used for screening among multiple neighboring cells that meet the S criterion. There are several implementation manners:

1). Only use the parameter rangeToLowestCell to filter.

For example, a cell whose difference between each lower limit height of a plurality of cells satisfying the cell selection criterion and the minimum lower limit height of the plurality of cells is less than or equal to rangeToHighestCell is used as the at least one candidate cell. At this time, the target cell may be a cell satisfying the following conditions among the at least one candidate cell:

1. The cell with the best signal quality; and/or,

2. The cell with the smallest lower limit height.

2). Use the parameters rangeToLowestCell and rangeToBestCell for joint screening.

For example, the difference between the minimum height of each lower limit of the multiple cells satisfying the cell selection criterion and the minimum lower limit of the multiple cells is less than or equal to rangeToHighestCell, and the maximum measured value of signal quality in the multiple cells is compared with all A cell whose signal quality difference between each cell of the multiple cells is less than or equal to rangeToBestCell is used as the at least one candidate cell.

At this time, the target cell may be a cell satisfying the following conditions among the at least one candidate cell:

a. The cell with the best signal quality; and/or,

b. The cell with the smallest lower limit height.

2. The cell with the best signal quality.

b. The cell with the smallest lower limit height.

3. The cell with the smallest lower limit height.

If there are multiple cells with the smallest lower limit height, the target cell may be one of the at least one candidate cell that also meets the following conditions:

a. The cell with the best signal quality; and/or,

Based on the above technical solutions, for the same frequency and same priority inter-frequency cell reselection, based on different flight modes, by introducing the target coverage height (such as the highest altitude in the take-off mode, the current flight altitude in the horizontal flight mode, the current flight altitude in the landing mode) The range value or tolerance of the lowest height), the target cell is screened in the height dimension, to ensure that the signal quality, including the number of cells with the measurement result greater than the preset threshold, can also meet the different flight of the drone in the height dimension. The mode's demand for coverage enables the drone to stay in the reselected cell for as long as possible, reducing the number of cell reselections, and thereby reducing the probability of connection failure.

In some embodiments of the present application, the drone terminal may obtain the altitude information through system information. For example, the drone terminal obtains system information sent by a network device, and the system information includes the altitude information. For example, the system information can be SIB3 or other SIBs.

The preferred embodiments of the present application are described in detail above with reference to the accompanying drawings. However, the present application is not limited to the specific details in the above-mentioned embodiments. Within the scope of the technical concept of the present application, various simple modifications can be made to the technical solutions of the present application. These simple variants all belong to the protection scope of this application.

For example, the specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this application no longer discusses various possible combinations. Explain separately.

For another example, various different implementations of this application can also be combined arbitrarily, as long as they do not violate the idea of this application, they should also be regarded as the content disclosed in this application.

It should be understood that, in the various method embodiments of the present application, the size of the sequence number of the foregoing processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not be implemented in this application. The implementation process of the example constitutes any limitation.

The method embodiment of the present application is described in detail above with reference to FIGS. 2 to 5, and the device embodiment of the present application is described in detail below with reference to FIGS. 6 to 8.

FIG. 6 is a schematic block diagram of a drone terminal 400 according to an embodiment of the present application.

As shown in FIG. 6, the drone terminal 400 may include:

The communication unit 410 is configured to obtain height information for at least one candidate cell;

The processing unit 420 is configured to determine a target cell from the at least one candidate cell according to the altitude information and the flight mode of the drone terminal;

The communication unit 410 is further configured to perform cell reselection based on the target cell.

In some embodiments of the present application, each candidate cell in the at least one candidate cell satisfies the cell selection criterion.

In some embodiments of the present application, the at least one candidate cell is a cell that meets the cell selection criterion among neighboring cells and/or serving cells of the drone terminal.

In some embodiments of the present application, the at least one candidate cell includes:

At least one inter-frequency cell whose frequency priority is lower than the frequency priority of the serving cell; and/or

At least one inter-frequency cell whose frequency priority is higher than the frequency priority of the serving cell.

In some embodiments of the present application, the processing unit 420 is specifically configured to:

If the drone terminal is in takeoff mode, determine the cell with the largest upper limit height among the at least one candidate cell as the target cell; and/or,

If the UAV terminal is in the take-off mode, the cell covered by the network device with the largest height among the at least one network device to which the at least one candidate cell belongs is determined as the target cell.

If the drone terminal is in a horizontal flight mode, determining the cell whose average value of the upper limit height and the lower limit height in the at least one candidate cell is closest to the flying height of the drone terminal as the target cell; and /or,

If the drone terminal is in the horizontal flight mode, determine the cell covered by the network device whose height is closest to the flying height of the drone terminal among the at least one network device to which the at least one candidate cell belongs Is the target cell.

If the drone terminal is in the landing mode, determine the cell with the smallest lower limit height among the at least one candidate cell as the target cell; and/or,

If the drone terminal is in the landing mode, the cell covered by the network device with the smallest height among the at least one network device to which the at least one candidate cell belongs is determined as the target cell.

At least one inter-frequency cell whose frequency priority is equal to the frequency priority of the serving cell; and/or

The frequency point is equal to the same frequency cell of the frequency point of the serving cell.

In some embodiments of the present application, the difference between the strongest signal quality of the at least one candidate cell and the signal quality of each candidate cell in the at least one candidate cell is less than the strongest signal threshold.

If the UAV terminal is in takeoff mode, determine the cell with the best signal quality among the at least one candidate cell as the target cell; and/or,

If the UAV terminal is in the take-off mode, determine the cell with the largest number of beams with beam quality greater than or equal to the preset threshold as the target cell; and/or,

If the UAV terminal is in the take-off mode, the cell covered by the network device with the largest height among the at least one network device is determined as the target cell.

In some embodiments of the present application, the altitude information further includes a second altitude threshold, and the average value of the upper limit height and the lower limit height of each candidate cell in the at least one candidate cell and the flying height of the drone terminal The difference between is less than the second height threshold, and/or the difference between the altitude of each network device in the at least one network device to which the at least one candidate cell belongs and the flight altitude of the drone terminal The values are all less than the second height threshold.

If the UAV terminal is in the horizontal flight mode, determine the cell with the best signal quality among the at least one candidate cell as the target cell; and/or,

If the UAV terminal is in the horizontal flight mode, determine the cell with the largest number of beams with beam quality greater than or equal to the preset threshold as the target cell; and/or,

In some embodiments of the present application, the height information further includes a third height threshold, and the difference between the lower limit height of each candidate cell in the at least one candidate cell and the minimum lower limit height of the at least one candidate cell is less than The third height threshold, and/or, the difference between the height of each network device in the at least one network device to which the at least one candidate cell belongs and the minimum height of the at least one network device is equal Less than the third height threshold.

If the UAV terminal is in the landing mode, determine the cell with the best signal quality among the at least one candidate cell as the target cell; and/or,

If the UAV terminal is in the landing mode, determine the cell with the largest number of beams with beam quality greater than or equal to the preset threshold as the target cell; and/or,

If the drone terminal is in the landing mode, determine the cell with the smallest upper limit height among the at least one candidate cell as the target cell; and/or,

If the drone terminal is in the landing mode, the cell covered by the network device with the smallest height among the at least one network device is determined as the target cell.

In some embodiments of the present application, the communication unit 410 is specifically configured to:

The height information for the at least one candidate cell is acquired by acquiring system information including the height information for the at least one candidate cell.

It should be understood that the device embodiment and the method embodiment may correspond to each other, and similar descriptions may refer to the method embodiment. Specifically, the drone terminal 400 shown in FIG. 6 may correspond to the corresponding subject in the method 200 of the embodiment of the present application, and the aforementioned and other operations and/or functions of the units in the drone terminal 400 are respectively To implement the corresponding process in the method shown in FIG. 2, for the sake of brevity, it will not be repeated here.

The communication device in the embodiment of the present application is described above from the perspective of functional modules in conjunction with FIG. 6. It should be understood that the functional module can be implemented in the form of hardware, can also be implemented in the form of software instructions, or can be implemented in a combination of hardware and software modules.

Specifically, the steps of the method embodiments in the embodiments of the present application can be completed by hardware integrated logic circuits in the processor and/or instructions in the form of software, and the steps of the methods disclosed in the embodiments of the present application can be directly embodied as hardware. The execution of the decoding processor is completed, or the execution is completed by a combination of hardware and software modules in the decoding processor.

Optionally, the software module may be located in a mature storage medium in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, and registers. The storage medium is located in the memory, and the processor reads the information in the memory, and completes the steps in the foregoing method embodiments in combination with its hardware.

For example, the aforementioned communication unit and processing unit may be implemented by a transceiver and a processor, respectively.

FIG. 7 is a schematic structural diagram of a communication device 500 according to an embodiment of the present application.

As shown in FIG. 7, the communication device 500 includes a processor 510, and the processor 510 can call and run a computer program from the memory to implement the method in the embodiment of the present application.

Please continue to refer to FIG. 7, the communication device 500 may further include a memory 520. The memory 520 may be used to store instruction information, and may also be used to store codes and instructions executed by the processor 510. The processor 510 may call and run a computer program from the memory 520 to implement the method in the embodiment of the present application.

The memory 520 may be a separate device independent of the processor 510, or may be integrated in the processor 510.

Please continue to refer to FIG. 7, the communication device 500 may also include a transceiver 530, and the processor 510 may control the transceiver 530 to communicate with other devices. Specifically, it may send information or data to other devices, or receive information sent by other devices. Or data.

Among them, the transceiver 530 may include a transmitter and a receiver. The transceiver 530 may further include an antenna, and the number of antennas may be one or more.

It should be understood that the communication device 500 may be the terminal device of the embodiment of the application, and the communication device 500 may implement the corresponding process implemented by the terminal device in each method of the embodiment of the application, that is, the communication device of the embodiment of the application 500 may correspond to the drone terminal 400 in the embodiment of the present application, and may correspond to the corresponding main body in executing the method 200 according to the embodiment of the present application. For the sake of brevity, details are not repeated here. Similarly, the communication device 500 may be the network device of the embodiment of the application, and the communication device 500 may cooperate with the drone terminal 400 to form the communication system shown in FIG. 1. For the sake of brevity, it is not here. Repeat it again.

It should be understood that the various components in the communication device 500 are connected by a bus system, where in addition to a data bus, the bus system also includes a power bus, a control bus, and a status signal bus.

In addition, an embodiment of the present application also provides a chip, which may be an integrated circuit chip with signal processing capability, and can implement or execute the methods, steps, and logical block diagrams disclosed in the embodiments of the present application.

Optionally, the chip can be applied to various communication devices, so that the communication device installed with the chip can execute the methods, steps, and logical block diagrams disclosed in the embodiments of the present application.

Fig. 8 is a schematic structural diagram of a chip according to an embodiment of the present application.

Referring to FIG. 8, the chip 600 includes a processor 610.

The processor 610 may call and run a computer program from the memory to implement the method in the embodiment of the present application.

Please continue to refer to FIG. 8, the chip 600 may further include a memory 620.

The processor 610 may call and run a computer program from the memory 620 to implement the method in the embodiment of the present application. The memory 620 may be used to store instruction information, and may also be used to store codes and instructions executed by the processor 610. The memory 620 may be a separate device independent of the processor 610, or may be integrated in the processor 610.

Please continue to refer to FIG. 8, the chip 600 may further include an input interface 630.

The processor 610 can control the input interface 630 to communicate with other devices or chips, and specifically, can obtain information or data sent by other devices or chips.

Please continue to refer to FIG. 8, the chip 600 may further include an output interface 640.

The processor 610 can control the output interface 640 to communicate with other devices or chips, and specifically, can output information or data to other devices or chips.

It should be understood that the chip 600 can be applied to the network equipment in the embodiments of the present application, and the chip can implement the corresponding processes implemented by the network equipment in the various methods of the embodiments of the present application, and can also implement the various methods of the embodiments of the present application. For the sake of brevity, the corresponding process implemented by the terminal device in the process will not be repeated here.

It should also be understood that the chips mentioned in the embodiments of the present application may also be referred to as system-level chips, system-on-chips, system-on-chips, or system-on-chips. It should also be understood that the various components in the chip 600 are connected by a bus system, where in addition to a data bus, the bus system also includes a power bus, a control bus, and a status signal bus.

The processor may include but is not limited to:

General-purpose processors, digital signal processors (Digital Signal Processor, DSP), Application Specific Integrated Circuit (ASIC), Field Programmable Gate Array (Field Programmable Gate Array, FPGA) or other programmable logic devices, discrete gates Or transistor logic devices, discrete hardware components, etc.

The processor may be used to implement or execute the methods, steps, and logical block diagrams disclosed in the embodiments of the present application. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor. The software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory or erasable programmable memory, registers. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

The storage includes but is not limited to:

Volatile memory and/or non-volatile memory. Among them, the non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), and electrically available Erase programmable read-only memory (Electrically EPROM, EEPROM) or flash memory. The volatile memory may be a random access memory (Random Access Memory, RAM), which is used as an external cache. By way of exemplary but not restrictive description, many forms of RAM are available, such as static random access memory (Static RAM, SRAM), dynamic random access memory (Dynamic RAM, DRAM), synchronous dynamic random access memory (Synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (Double Data Rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (Enhanced SDRAM, ESDRAM), synchronous link dynamic random access memory (synch link DRAM, SLDRAM) and Direct Rambus RAM (DR RAM).

It should be noted that the memories of the systems and methods described herein are intended to include, but are not limited to, these and any other suitable types of memories.

The embodiments of the present application also provide a computer-readable storage medium for storing computer programs. The computer-readable storage medium stores one or more programs, and the one or more programs include instructions that, when executed by a portable electronic device that includes multiple application programs, can cause the portable electronic device to execute methods 300 to 500 The method of the illustrated embodiment.

Optionally, the computer-readable storage medium may be applied to the network device in the embodiment of the present application, and the computer program causes the computer to execute the corresponding process implemented by the network device in each method of the embodiment of the present application. For brevity, here No longer.

Optionally, the computer-readable storage medium can be applied to the mobile terminal/terminal device in the embodiment of the present application, and the computer program enables the computer to execute the corresponding process implemented by the mobile terminal/terminal device in each method of the embodiment of the present application , For the sake of brevity, I will not repeat it here.

The embodiments of the present application also provide a computer program product, including a computer program.

Optionally, the computer program product can be applied to the network device in the embodiment of the present application, and the computer program causes the computer to execute the corresponding process implemented by the network device in each method of the embodiment of the present application. For the sake of brevity, it will not be omitted here. Repeat.

Optionally, the computer program product can be applied to the mobile terminal/terminal device in the embodiment of the present application, and the computer program causes the computer to execute the corresponding process implemented by the mobile terminal/terminal device in each method of the embodiment of the present application, for It’s concise and will not be repeated here.

The embodiment of the application also provides a computer program. When the computer program is executed by a computer, the computer can execute the methods in the embodiments shown in method 300 to method 500.

Optionally, the computer program can be applied to the network device in the embodiment of the present application. When the computer program runs on the computer, the computer is caused to execute the corresponding process implemented by the network device in each method of the embodiment of the present application. For the sake of brevity , I won’t repeat it here.

The embodiment of the present application also provides a communication system. The communication system may include a drone terminal 400 as shown in FIG. 6 and a network device that can communicate with the drone terminal 400 to form a communication system, for example For the sake of brevity, the communication system 100 in FIG. 1 will not be repeated here.

It should be noted that the term "system" in this article may also be referred to as "network management architecture" or "network system".

It should also be understood that the terms used in the embodiments of the present application and the appended claims are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application.

For example, the singular forms of "a", "said", "above" and "the" used in the embodiments of this application and the appended claims are also intended to include plural forms, unless the context clearly indicates other forms. meaning.

Those skilled in the art may realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of the embodiments of the present application.

If implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the embodiments of the present application can be embodied in the form of software products in essence or the parts that contribute to the prior art or the parts of the technical solutions, and the computer software products are stored in a storage medium. , Including several instructions to enable a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in the embodiments of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory, random access memory, magnetic disk or optical disk and other media that can store program codes.

Those skilled in the art can clearly understand that, for the convenience and conciseness of description, the specific working process of the above-described system, device, and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, device, and method may be implemented in other ways.

For example, the division of units or modules or components in the device embodiments described above is only a logical function division, and there may be other divisions in actual implementation. For example, multiple units or modules or components can be combined or integrated. To another system, or some units or modules or components can be ignored or not executed.

For another example, the units/modules/components described as separate/display components may or may not be physically separated, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units/modules/components may be selected according to actual needs to achieve the objectives of the embodiments of the present application.

Finally, it should be noted that the mutual coupling or direct coupling or communication connection shown or discussed above may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms. .

The above content is only the specific implementation manners of the embodiments of the application, but the protection scope of the embodiments of the application is not limited thereto. Any person skilled in the art can easily think of within the technical scope disclosed in the embodiments of the application. The change or replacement shall be covered within the protection scope of the embodiments of this application. Therefore, the protection scope of the embodiments of the present application should be subject to the protection scope of the claims.

Claims

A method for cell reselection, characterized in that it comprises:

Acquiring height information for at least one candidate cell;

Determining a target cell from the at least one candidate cell according to the altitude information and the flight mode of the drone terminal;

Perform cell reselection based on the target cell.
The method according to claim 1, wherein the at least one candidate cell comprises a serving cell of the UAV terminal and/or at least one neighboring cell of the serving cell.
The method according to claim 1 or 2, wherein the height information includes at least one of the following information:

The upper limit height of coverage of each cell in the at least one candidate cell;

The lower limit height of the coverage of each cell in the at least one candidate cell; and

The height of the network device to which the at least one candidate cell belongs.
The method according to any one of claims 1 to 3, wherein each candidate cell of the at least one candidate cell satisfies a cell selection criterion.
The method according to any one of claims 1 to 4, wherein the at least one candidate cell is a cell that meets the cell selection criterion among neighboring cells and/or serving cells of the UAV terminal.
The method according to claim 4 or 5, wherein the at least one candidate cell comprises:

At least one inter-frequency cell whose frequency priority is lower than the frequency priority of the serving cell; and/or,

At least one inter-frequency cell whose frequency priority is higher than the frequency priority of the serving cell.
The method according to claim 6, wherein the determining a target cell from the at least one candidate cell according to the altitude information and the flight mode of the drone terminal comprises:

If the drone terminal is in takeoff mode, determine the cell with the largest upper limit height among the at least one candidate cell as the target cell; and/or,

If the UAV terminal is in the take-off mode, the cell covered by the network device with the largest height among the at least one network device to which the at least one candidate cell belongs is determined as the target cell.
The method according to claim 6, wherein the determining a target cell from the at least one candidate cell according to the altitude information and the flight mode of the drone terminal comprises:

If the drone terminal is in a horizontal flight mode, determining the cell whose average value of the upper limit height and the lower limit height in the at least one candidate cell is closest to the flying height of the drone terminal as the target cell; and /or,

If the drone terminal is in the horizontal flight mode, determine the cell covered by the network device whose height is closest to the flying height of the drone terminal among the at least one network device to which the at least one candidate cell belongs Is the target cell.
The method according to claim 6, wherein the determining a target cell from the at least one candidate cell according to the altitude information and the flight mode of the drone terminal comprises:

If the drone terminal is in the landing mode, determine the cell with the smallest lower limit height among the at least one candidate cell as the target cell; and/or,

If the drone terminal is in the landing mode, the cell covered by the network device with the smallest height among the at least one network device to which the at least one candidate cell belongs is determined as the target cell.
The method according to claim 4 or 5, wherein the at least one candidate cell comprises:

At least one inter-frequency cell whose frequency priority is equal to the frequency priority of the serving cell; and/or,

The frequency point is equal to the same frequency cell of the frequency point of the serving cell.
The method according to claim 10, wherein the difference between the strongest signal quality of the at least one candidate cell and the signal quality of each candidate cell in the at least one candidate cell is less than the pre-configured strongest signal Threshold.
The method according to claim 10 or 11, wherein the height information further comprises a first height threshold, the maximum upper limit height of the at least one candidate cell and the upper limit of each candidate cell in the at least one candidate cell The height difference is less than the first height threshold, and/or the maximum height of the at least one network device to which the at least one candidate cell belongs is different from the height of each network device in the at least one network device. The height differences of are all smaller than the first height threshold.
The method according to claim 12, wherein the determining a target cell from the at least one candidate cell according to the altitude information and the flight mode of the UAV terminal comprises:

If the UAV terminal is in takeoff mode, determine the cell with the best signal quality among the at least one candidate cell as the target cell; and/or,

If the UAV terminal is in the take-off mode, determine the cell with the largest number of beams with beam quality greater than or equal to the preset threshold as the target cell; and/or,

If the drone terminal is in takeoff mode, determine the cell with the largest upper limit height among the at least one candidate cell as the target cell; and/or,

If the UAV terminal is in the take-off mode, the cell covered by the network device with the largest height among the at least one network device is determined as the target cell.
The method according to claim 10 or 11, wherein the height information further comprises a second height threshold, and the average value of the upper limit height and the lower limit height of each candidate cell in the at least one candidate cell is different from the average value of the lower limit height. The difference between the flight heights of the human-machine terminal is less than the second height threshold, and/or the height of each network device in the at least one network device to which the at least one candidate cell belongs is the same as that of the drone The difference in the flying height of the terminal is all less than the second height threshold.
The method according to claim 14, wherein the determining a target cell from the at least one candidate cell according to the altitude information and the flight mode of the drone terminal comprises:

If the UAV terminal is in the horizontal flight mode, determine the cell with the best signal quality among the at least one candidate cell as the target cell; and/or,

If the UAV terminal is in the horizontal flight mode, determine the cell with the largest number of beams with beam quality greater than or equal to the preset threshold as the target cell; and/or,

If the drone terminal is in a horizontal flight mode, determining the cell whose average value of the upper limit height and the lower limit height in the at least one candidate cell is closest to the flying height of the drone terminal as the target cell; and /or,

If the drone terminal is in the horizontal flight mode, determine the cell covered by the network device whose height is closest to the flying height of the drone terminal among the at least one network device to which the at least one candidate cell belongs Is the target cell.
The method according to claim 10 or 11, wherein the height information further comprises a third height threshold, and the lower limit height of each candidate cell in the at least one candidate cell is equal to the minimum lower limit of the at least one candidate cell. The height difference is all smaller than the third height threshold, and/or the height of each network device in the at least one network device to which the at least one candidate cell belongs is the same as the smallest location of the at least one network device The height differences of are all smaller than the third height threshold.
The method according to claim 16, wherein the determining a target cell from the at least one candidate cell according to the altitude information and the flight mode of the UAV terminal comprises:

If the UAV terminal is in the landing mode, determine the cell with the best signal quality among the at least one candidate cell as the target cell; and/or,

If the UAV terminal is in the landing mode, determine the cell with the largest number of beams with beam quality greater than or equal to the preset threshold as the target cell; and/or,

If the drone terminal is in the landing mode, determine the cell with the smallest upper limit height among the at least one candidate cell as the target cell; and/or,

If the drone terminal is in the landing mode, the cell covered by the network device with the smallest height among the at least one network device is determined as the target cell.
The method according to any one of claims 1 to 17, wherein said obtaining height information for at least one candidate cell comprises:

The height information for the at least one candidate cell is acquired by acquiring system information including the height information for the at least one candidate cell.
An unmanned aerial vehicle terminal, characterized in that it includes:

A communication unit, configured to obtain height information for at least one candidate cell;

A processing unit, configured to determine a target cell from the at least one candidate cell according to the altitude information and the flight mode of the drone terminal;

The communication unit is further configured to perform cell reselection based on the target cell.
The UAV terminal according to claim 19, wherein the at least one candidate cell comprises a serving cell of the UAV terminal and/or at least one neighboring cell of the serving cell.
The UAV terminal according to claim 19 or 20, wherein the height information includes at least one of the following information:

The upper limit height of coverage of each cell in the at least one candidate cell;

The lower limit height of the coverage of each cell in the at least one candidate cell; and

The height of the network device to which the at least one candidate cell belongs.
The UAV terminal according to any one of claims 19 to 21, wherein each candidate cell in the at least one candidate cell satisfies a cell selection criterion.
The UAV terminal according to any one of claims 19 to 22, wherein each candidate cell in the at least one candidate cell satisfies a cell selection criterion.
The UAV terminal according to claim 22 or 23, wherein the at least one candidate cell comprises:

At least one inter-frequency cell whose frequency priority is lower than the frequency priority of the serving cell; and/or,

At least one inter-frequency cell whose frequency priority is higher than the frequency priority of the serving cell.
The drone terminal according to claim 24, wherein the processing unit is specifically configured to:

If the drone terminal is in takeoff mode, determine the cell with the largest upper limit height among the at least one candidate cell as the target cell; and/or,

If the UAV terminal is in the take-off mode, the cell covered by the network device with the largest height among the at least one network device to which the at least one candidate cell belongs is determined as the target cell.
The drone terminal according to claim 24, wherein the processing unit is specifically configured to:

If the drone terminal is in a horizontal flight mode, determining the cell whose average value of the upper limit height and the lower limit height in the at least one candidate cell is closest to the flying height of the drone terminal as the target cell; and /or,

If the drone terminal is in the horizontal flight mode, determine the cell covered by the network device whose height is closest to the flying height of the drone terminal among the at least one network device to which the at least one candidate cell belongs Is the target cell.
The drone terminal according to claim 24, wherein the processing unit is specifically configured to:

If the drone terminal is in the landing mode, determine the cell with the smallest lower limit height among the at least one candidate cell as the target cell; and/or,

If the drone terminal is in the landing mode, the cell covered by the network device with the smallest height among the at least one network device to which the at least one candidate cell belongs is determined as the target cell.
The UAV terminal according to claim 22 or 23, wherein the at least one candidate cell comprises:

At least one inter-frequency cell whose frequency priority is equal to the frequency priority of the serving cell; and/or,

The frequency point is equal to the same frequency cell of the frequency point of the serving cell.
The UAV terminal according to claim 28, wherein the difference between the strongest signal quality of the at least one candidate cell and the signal quality of each candidate cell in the at least one candidate cell is less than the maximum signal quality. Strong signal threshold.
The UAV terminal according to claim 28 or 29, wherein the height information further comprises a first height threshold, the maximum upper limit height of the at least one candidate cell and each candidate in the at least one candidate cell The difference between the upper limit height of the cell is less than the first height threshold, and/or the maximum height of the at least one network device to which the at least one candidate cell belongs is the same as that of each network device in the at least one network device The height difference of where is less than the first height threshold.
The drone terminal according to claim 30, wherein the processing unit is specifically configured to:

If the UAV terminal is in takeoff mode, determine the cell with the best signal quality among the at least one candidate cell as the target cell; and/or,

If the UAV terminal is in the take-off mode, determine the cell with the largest number of beams with beam quality greater than or equal to the preset threshold as the target cell; and/or,

If the drone terminal is in takeoff mode, determine the cell with the largest upper limit height among the at least one candidate cell as the target cell; and/or,

If the UAV terminal is in the take-off mode, the cell covered by the network device with the largest height among the at least one network device is determined as the target cell.
The UAV terminal according to claim 28 or 29, wherein the height information further comprises a second height threshold, and the average value of the upper limit height and the lower limit height of each candidate cell in the at least one candidate cell is The difference between the flying heights of the drone terminal is less than the second height threshold, and/or the height of each network device in the at least one network device to which the at least one candidate cell belongs is different from the height of the The difference in the flying height of the drone terminal is all less than the second height threshold.
The drone terminal according to claim 32, wherein the processing unit is specifically configured to:

If the UAV terminal is in the horizontal flight mode, determine the cell with the best signal quality among the at least one candidate cell as the target cell; and/or,

If the UAV terminal is in the horizontal flight mode, determine the cell with the largest number of beams with beam quality greater than or equal to the preset threshold as the target cell; and/or,

If the drone terminal is in a horizontal flight mode, determining the cell whose average value of the upper limit height and the lower limit height in the at least one candidate cell is closest to the flying height of the drone terminal as the target cell; and /or,

If the drone terminal is in the horizontal flight mode, determine the cell covered by the network device whose height is closest to the flying height of the drone terminal among the at least one network device to which the at least one candidate cell belongs Is the target cell.
The UAV terminal according to claim 28 or 29, wherein the height information further comprises a third height threshold, and the lower limit height of each candidate cell in the at least one candidate cell is the same as that of the at least one candidate cell. The difference between the minimum lower limit height and the third height threshold is smaller than the third height threshold, and/or the height of each network device in the at least one network device to which the at least one candidate cell belongs is different from the height The difference between the minimum heights is less than the third height threshold.
The drone terminal according to claim 34, wherein the processing unit is specifically configured to:

If the UAV terminal is in the landing mode, determine the cell with the best signal quality among the at least one candidate cell as the target cell; and/or,

If the UAV terminal is in the landing mode, determine the cell with the largest number of beams with beam quality greater than or equal to the preset threshold as the target cell; and/or,

If the drone terminal is in the landing mode, determine the cell with the smallest upper limit height among the at least one candidate cell as the target cell; and/or,

If the drone terminal is in the landing mode, the cell covered by the network device with the smallest height among the at least one network device is determined as the target cell.
The UAV terminal according to any one of claims 19 to 35, wherein the communication unit is specifically configured to:

The height information for the at least one candidate cell is acquired by acquiring system information including the height information for the at least one candidate cell.
An unmanned aerial vehicle terminal, characterized in that it includes:

A processor, a memory and a transceiver, the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the method according to any one of claims 1 to 18.
A chip, characterized in that it comprises:

The processor is configured to call and run a computer program from the memory, so that the device installed with the chip executes the method according to any one of claims 1 to 18.
A computer-readable storage medium, characterized in that it is used to store a computer program that enables a computer to execute the method according to any one of claims 1 to 18.
A computer program product, characterized by comprising computer program instructions, which cause a computer to execute the method according to any one of claims 1 to 18.
A computer program, wherein the computer program causes a computer to execute the method according to any one of claims 1 to 18.