WO2021016894A1 - Procédé de resélection de cellule et terminal de véhicule aérien sans pilote - Google Patents

Procédé de resélection de cellule et terminal de véhicule aérien sans pilote Download PDF

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Publication number
WO2021016894A1
WO2021016894A1 PCT/CN2019/098458 CN2019098458W WO2021016894A1 WO 2021016894 A1 WO2021016894 A1 WO 2021016894A1 CN 2019098458 W CN2019098458 W CN 2019098458W WO 2021016894 A1 WO2021016894 A1 WO 2021016894A1
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WIPO (PCT)
Prior art keywords
cell
height
terminal
candidate
candidate cell
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PCT/CN2019/098458
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English (en)
Chinese (zh)
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尤心
卢前溪
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Oppo广东移动通信有限公司
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Application filed by Oppo广东移动通信有限公司 filed Critical Oppo广东移动通信有限公司
Priority to PCT/CN2019/098458 priority Critical patent/WO2021016894A1/fr
Priority to CN201980092881.5A priority patent/CN113475117A/zh
Publication of WO2021016894A1 publication Critical patent/WO2021016894A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
    • H04W36/324—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data by mobility data, e.g. speed data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
    • H04W36/328—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data by altitude

Definitions

  • 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.
  • 5G enhanced mobile ultra-broadband
  • URLLC low-latency and highly reliable communication
  • mMTC large-scale machine-type communication
  • UAV Unmanned Aerial Vehicle
  • UAV terminal UAV terminal for short.
  • UAV Unmanned Aerial Vehicle
  • 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.
  • 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.
  • the network deployment method is to increase new network coverage for different heights.
  • the UAV terminal may cause frequent cell reselection processes.
  • 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.
  • a method for reselecting a cell and a drone terminal are provided, which can improve the success rate of data transmission and user experience.
  • a method for cell reselection including:
  • an unmanned aerial vehicle terminal which is used to execute the method in the above-mentioned first aspect or its implementation manners.
  • the UAV terminal includes a functional module for executing the method in the above-mentioned first aspect or each implementation manner thereof.
  • an unmanned aerial vehicle terminal 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.
  • a chip which is used to implement the method in the first aspect or its implementation manners.
  • 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.
  • a computer-readable storage medium for storing a computer program that enables a computer to execute the method in the first aspect or its implementation manners.
  • a computer program product including computer program instructions, which cause a computer to execute the method in the first aspect or its implementation manners.
  • a computer program which when running on a computer, causes the computer to execute the method in the first aspect or its implementation manners.
  • 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.
  • 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.
  • Fig. 1 is a schematic diagram of an application scenario of an embodiment of the present application.
  • 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.
  • LTE Long Term Evolution
  • TDD Time Division Duplex
  • Universal Mobile Communication System Universal Mobile Telecommunication System
  • UMTS Universal Mobile Telecommunication System
  • 5G communication system also known as New Radio (NR) communication system
  • future communication system etc.
  • 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.
  • 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.
  • Evolutional Node B, eNB or eNodeB in a Long Term Evolution (LTE) system
  • NG RAN Next Generation Radio Access Network
  • gNB base station
  • CRAN Cloud Radio Access Network
  • the network device 120 may be a relay station, an access point, In-vehicle devices, wearable devices, hubs, switches, bridge
  • 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.
  • SIP Session Initiation Protocol
  • WLL Wireless Local Loop
  • PDA Personal Digital Assistant
  • 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).
  • 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.
  • EPC Evolved Packet Core
  • SMF+PGW-C can simultaneously realize the functions that SMF and PGW-C can realize.
  • 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.
  • each functional unit in the communication system 100 may establish a connection through a next generation network (NG) interface to implement communication.
  • NG next generation network
  • 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).
  • N1 next generation wireless access base station
  • gNB next generation wireless access base station
  • the part shown in Figure 2 is only an exemplary architecture diagram.
  • 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.
  • UDM unified data management
  • FIG. 1 exemplarily shows a base station, a core network device and two terminal devices.
  • 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.
  • 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.
  • a new RRC state that is, the RRC_INACTIVE state. This state is different from the RRC_IDLE and RRC_ACTIVE states.
  • 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.
  • CN core network
  • 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.
  • 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.
  • the UAV terminal only considers existing measurement values such as RSRP/RSRQ during the cell reselection process, it may cause frequent cell reselection processes.
  • the UAV terminal if it 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.
  • 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.
  • the method 200 includes:
  • S210 The drone terminal obtains height information for at least one candidate cell.
  • 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.
  • the UAV terminal 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.
  • the cell selection criterion for example, the S criterion
  • 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.
  • 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.
  • 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 is the upper limit height of coverage of each cell in the at least one candidate cell
  • the height of the network device to which the at least one candidate cell belongs is the height of the network device to which the at least one candidate cell belongs.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • inter-frequency cell also referred to as a low-priority inter-frequency cell
  • the frequency priority At least one inter-frequency cell also referred to as a high-priority inter-frequency cell
  • the at least one candidate cell may include at least one same-frequency cell and/or at least one same-priority inter-frequency cell.
  • 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.
  • the cell selection criterion may be the S criterion.
  • Srxlev if Srxlev>0, stay in the cell.
  • Srxlev calculation formula is as follows:
  • 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).
  • 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.
  • 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 are selected among neighboring cells and/or serving cells of the UAV terminal.
  • 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.
  • 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.
  • the cell selection criterion for example, the S criterion
  • 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.
  • the reselection criterion may be an R criterion.
  • Rn Q meas, n -Qoffset-Qoffset temp .
  • 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
  • Q hyst is a hysteresis value.
  • 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 .
  • 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.
  • the terminal device triggers the reselection process to the cell; otherwise, the high priority frequency point
  • the UE triggers a reselection process to the cell.
  • 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.
  • the flight mode of the drone terminal may include at least one of the following:
  • 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.
  • 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
  • the landing mode may refer to the height of the drone terminal. In a certain period of time in a continuous decline.
  • 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.
  • 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.
  • the target cell may be determined in the following manner:
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the drone terminal 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.
  • 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
  • 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.
  • the drone terminal 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
  • 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.
  • 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.
  • 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.
  • 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.
  • the auxiliary parameter may include a threshold value of the strongest signal that the drone terminal can receive.
  • 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.
  • the strongest signal threshold may be the rangeToBestCell mentioned above.
  • 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.
  • each of the at least one candidate cell can meet the coverage requirement of the UAV terminal in the take-off mode.
  • the drone terminal can determine the target cell in the following manner:
  • 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.
  • the parameter first height threshold (rangeToHighestCell) may be used for screening among multiple neighboring cells that meet the S criterion.
  • rangeToHighestCell the parameter first height threshold
  • the target cell may be a cell satisfying the following conditions among the at least one candidate cell:
  • 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.
  • the target cell may be a cell satisfying the following conditions among the at least one candidate cell:
  • the target cell may be a cell that also meets the following conditions among the at least one candidate cell:
  • the target cell may be a cell that also meets the following conditions among the at least one candidate cell:
  • the target cell may be a cell among the at least one candidate cell that also meets the following conditions:
  • 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.
  • each of the at least one candidate cell can meet the coverage requirement of the drone terminal in the horizontal flight mode.
  • the drone terminal can determine the target cell in the following manner:
  • 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.
  • the second height threshold (rangeToCurrentHightCell) can be used for screening among multiple neighboring cells that meet the S criterion.
  • 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.
  • the target cell may be a cell satisfying the following conditions among the at least one candidate cell:
  • 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.
  • 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.
  • the target cell may be a cell satisfying the following conditions among the at least one candidate cell:
  • the target cell may be a cell that also meets the following conditions among the at least one candidate cell:
  • the target cell may be a cell that also meets the following conditions among the at least one candidate cell:
  • the target cell may be a cell that also meets the following conditions among the at least one candidate cell:
  • 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.
  • each of the at least one candidate cell can meet the coverage requirement of the drone terminal in the landing mode.
  • the drone terminal can determine the target cell in the following manner:
  • 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.
  • the third height threshold (rangeToLowestCell) can be used for screening among multiple neighboring cells that meet the S criterion.
  • the target cell may be a cell satisfying the following conditions among the at least one candidate cell:
  • 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.
  • the target cell may be a cell satisfying the following conditions among the at least one candidate cell:
  • the target cell may be a cell that also meets the following conditions among the at least one candidate cell:
  • the target cell may be a cell that also meets the following conditions among the at least one candidate cell:
  • the target cell may be one of the at least one candidate cell that also meets the following conditions:
  • 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.
  • the drone terminal may obtain the altitude information through system information.
  • the drone terminal obtains system information sent by a network device, and the system information includes the altitude information.
  • the system information can be SIB3 or other SIBs.
  • 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.
  • FIG. 6 is a schematic block diagram of a drone terminal 400 according to an embodiment of the present application.
  • 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.
  • 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.
  • 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 is the upper limit height of coverage of each cell in the at least one candidate cell
  • the height of the network device to which the at least one candidate cell belongs is the height of the network device to which the at least one candidate cell belongs.
  • each candidate cell in the at least one candidate cell satisfies the cell selection criterion.
  • 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.
  • 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;
  • At least one inter-frequency cell whose frequency priority is higher than the frequency priority of the serving cell.
  • the processing unit 420 is specifically configured to:
  • 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 processing unit 420 is specifically configured to:
  • 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,
  • the drone terminal 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 processing unit 420 is specifically configured to:
  • the drone terminal 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,
  • 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 at least one candidate cell includes:
  • At least one inter-frequency cell whose frequency priority is equal to the frequency priority of the serving cell;
  • the frequency point is equal to the same frequency cell of the frequency point of the serving cell.
  • 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.
  • 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.
  • the processing unit 420 is specifically configured to:
  • the UAV terminal determines the cell with the best signal quality among the at least one candidate cell as the target cell; and/or,
  • the UAV terminal determines 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,
  • 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 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.
  • the processing unit 420 is specifically configured to:
  • the UAV terminal determines the cell with the best signal quality among the at least one candidate cell as the target cell; and/or,
  • the UAV terminal determines 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,
  • 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,
  • the drone terminal 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 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.
  • the processing unit 420 is specifically configured to:
  • the UAV terminal determines the cell with the best signal quality among the at least one candidate cell as the target cell; and/or,
  • the UAV terminal determines 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,
  • the drone terminal 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,
  • 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 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.
  • the device embodiment and the method embodiment may correspond to each other, and similar descriptions may refer to the method embodiment.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the corresponding process implemented by the terminal device in the process will not be repeated here.
  • 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:
  • DSP Digital Signal Processor
  • ASIC Application Specific Integrated Circuit
  • FPGA Field Programmable Gate Array
  • FPGA Field Programmable Gate Array
  • 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:
  • 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.
  • RAM random access memory
  • SRAM static random access memory
  • DRAM dynamic random access memory
  • DRAM synchronous dynamic random access memory
  • DDR SDRAM double data rate synchronous dynamic random access memory
  • Enhanced SDRAM, ESDRAM enhanced synchronous dynamic random access memory
  • SLDRAM synchronous link dynamic random access memory
  • DR RAM Direct Rambus RAM
  • 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.
  • 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.
  • 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.
  • 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 ,
  • 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 ,
  • I will not repeat it here.
  • the embodiments of the present application also provide a computer program product, including a computer program.
  • 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.
  • 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.
  • 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.
  • 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.
  • the 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.
  • the computer program can be applied to the network device in the embodiment of the present application.
  • 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.
  • 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
  • a communication system for example
  • the communication system 100 in FIG. 1 will not be repeated here.
  • system in this article may also be referred to as “network management architecture” or “network system”.
  • 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.
  • 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.
  • 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.
  • 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.

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Abstract

L'invention concerne un procédé de resélection de cellule et un terminal de véhicule aérien sans pilote. Le procédé consiste à : acquérir des informations d'altitude pour au moins une cellule candidate ; déterminer une cellule cible parmi la ou les cellules candidates en fonction des informations d'altitude et du mode de vol d'un terminal de véhicule aérien sans pilote ; et réaliser une resélection de cellule sur la base de la cellule cible. Sur la base de la solution technique, l'introduction d'informations d'altitude pour au moins une cellule candidate dans un processus de resélection de cellule d'un terminal de véhicule aérien sans pilote permet au terminal de véhicule aérien sans pilote de sélectionner de préférence la cellule ayant le plus grand intervalle de couverture d'altitude pendant une resélection de cellule en fonction de différents modes de vol, de manière à éviter une resélection de cellule fréquente en raison du processus de vol et à prolonger la durée de campement dans une cellule resélectionnée, de telle sorte que le temps pour l'établissement de connexion soit garanti et que la probabilité d'échec d'établissement dû à une resélection de cellule pendant l'établissement de connexion soit réduite, ce qui permet d'améliorer le taux de réussite de transmission de données et l'expérience utilisateur.
PCT/CN2019/098458 2019-07-30 2019-07-30 Procédé de resélection de cellule et terminal de véhicule aérien sans pilote WO2021016894A1 (fr)

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