Mobile strategy adjustment method and device for low-altitude terminal, equipment, medium and product

Abstract

The invention discloses a low-altitude terminal movement strategy adjustment method and device, equipment, a medium and a product. The method comprises the following steps: identifying a terminal type of a terminal; wherein the terminal type is a low-altitude terminal or a non-low-altitude terminal; when the terminal is a low-altitude terminal, configuring a low-altitude mobility strategy for the low-altitude terminal; and when the terminal is a non-low-altitude terminal, configuring a ground mobility strategy for the non-low-altitude terminal. By adopting the means of the invention, a proper low-altitude mobility strategy can be configured for the low-altitude terminal, and the communication quality of the low-altitude terminal is ensured.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technology, and in particular to a method, device, equipment, medium and product for adjusting a mobility strategy of a low-altitude terminal. Background Art

[0002] The low-altitude economy has huge development potential, which mainly refers to a comprehensive economic form that relies on low-altitude airspace, driven by low-altitude flight activities of various manned and unmanned aircraft, and radiates to drive the integrated development of related fields.

[0003] Since the low-altitude economy is in the initial start-up stage, the existing 5G wireless network does not have any special adjustment and optimization process for low-altitude terminals. Therefore, the low-altitude terminals still follow the original ground mobility strategy during flight, that is, the terminals still complete mobility switching based on the same-frequency switching, different-frequency switching and other strategies after measurement. This leads to chaos in the low-altitude switching of the existing network, frequent switching of low-altitude terminals during flight, unstable switching sequence, differences in test results of the same line at different times, and low-altitude terminals will receive a large number of cell signals in the air, causing great interference. Summary of the invention

[0004] The purpose of the embodiments of the present invention is to provide a method, device, equipment, medium and product for adjusting the mobility strategy of a low-altitude terminal, which can configure a suitable low-altitude mobility strategy for the low-altitude terminal to ensure the communication quality of the low-altitude terminal.

[0005] To achieve the above object, an embodiment of the present invention provides a method for adjusting a mobility strategy of a low-altitude terminal, comprising:

[0006] Identify the terminal type of the terminal; wherein the terminal type is a low-altitude terminal or a non-low-altitude terminal;

[0007] When the terminal is a low-altitude terminal, configuring a low-altitude mobility strategy for the low-altitude terminal;

[0008] When the terminal is a non-low-altitude terminal, a ground mobility strategy is configured for the non-low-altitude terminal.

[0009] As an improvement of the above solution, the terminal type of the identification terminal is specifically:

[0010] Determine the terminal type of the terminal according to the slice configuration information of the terminal or based on beam training;

[0011] or,

[0012] When receiving a switching request from a terminal, the terminal type of the terminal is identified based on whether the switching request carries a low-altitude terminal identifier; wherein the low-altitude terminal identifier is added by the source cell after determining that the terminal is a low-altitude terminal based on the terminal's slice configuration information or based on beam training.

[0013] As an improvement of the above solution, the low-altitude terminal includes a fixed contracted low-altitude terminal and a temporary low-altitude terminal; then judging the terminal type of the terminal according to the slice configuration information of the terminal or based on beam training includes:

[0014] Acquire slice configuration information of the terminal, and when the slice configuration information meets the preset configuration requirements, determine that the terminal is a fixed contracted low-altitude terminal;

[0015] The beam management mechanism is used to perform beam training on the terminal; wherein the beam training includes downlink beam training and uplink beam training; after the downlink beam training is completed, the terminal continues to communicate with the configured non-ground coverage beam within a preset time period, and during the uplink beam training process, the terminal continues to use the preset downtilt beam within the preset time period, and the terminal is determined to be a temporary low-altitude terminal;

[0016] Otherwise, the terminal is determined to be a non-low-altitude terminal.

[0017] As an improvement to the above solution, add a low-altitude terminal identifier to the low-altitude terminal by following the steps below:

[0018] For a fixed contracted low-altitude terminal, obtain a low-altitude terminal identifier from the core network side, and add the low-altitude terminal identifier to the fixed contracted low-altitude terminal; wherein the low-altitude terminal identifier is generated by the core network after sensing the fixed contracted low-altitude terminal through slice information during the service request stage;

[0019] For a temporary low-altitude terminal, a low-altitude terminal identifier is generated during beam training, and the low-altitude terminal identifier is added to the temporary low-altitude terminal.

[0020] As an improvement of the above solution, configuring a low-altitude mobility strategy for the low-altitude terminal includes:

[0021] When the low-altitude terminal is the first low-altitude terminal, the ground mobility strategy issued in the early stage is updated to the low-altitude mobility strategy for the low-altitude terminal; wherein the first low-altitude terminal is a low-altitude terminal determined by the cell through beam training and added with a low-altitude terminal identifier;

[0022] When the low-altitude terminal is a second low-altitude terminal, a low-altitude mobility strategy for the low-altitude terminal is directly issued after receiving the switching request or during the service establishment process; wherein, the second low-altitude terminal is a low-altitude terminal determined by other cells and added with a low-altitude terminal identifier.

[0023] As an improvement of the above solution, the low-altitude mobility strategy includes a switching bias; the switching bias is used to generate a trigger condition for a measurement report of the same-frequency switching.

[0024] As an improvement of the above solution, the low-altitude mobility strategy includes a reporting time interval offset; the reporting time interval offset is used to offset the reporting time interval of the measurement report.

[0025] As an improvement of the above solution, the low-altitude mobility strategy includes distance information between the source cell and all switchable target cells; the distance information is used to set different switching difficulties for different target cells.

[0026] As an improvement of the above scheme, the low-altitude mobility strategy includes a neighbor area differentiation configuration of the low-altitude terminal and the ground terminal, wherein the ground terminal adopts a linear movement strategy to configure the neighbor area, and the low-altitude terminal adopts a surface movement strategy to configure the neighbor area.

[0027] The embodiment of the present invention further provides a low-altitude terminal mobile strategy adjustment device, comprising:

[0028] A terminal type identification module, used to identify the terminal type of the terminal; wherein the terminal type is a low-altitude terminal or a non-low-altitude terminal;

[0029] A low-altitude mobility strategy allocation module, used for configuring a low-altitude mobility strategy for the low-altitude terminal when the terminal is a low-altitude terminal;

[0030] The ground mobility strategy allocation module is used to configure a ground mobility strategy for the non-low-altitude terminal when the terminal is a non-low-altitude terminal.

[0031] An embodiment of the present invention also provides a mobile strategy adjustment device for a low-altitude terminal, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, it implements a mobile strategy adjustment method for a low-altitude terminal as described in any one of the above items.

[0032] An embodiment of the present invention also provides a computer-readable storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the mobile strategy adjustment method of the low-altitude terminal as described in any one of the above items.

[0033] An embodiment of the present invention also provides a computer program product, which includes a computer program or computer instructions. When the computer program or the computer instructions are executed by a processor, the method for adjusting the mobile strategy of a low-altitude terminal as described in any one of the above items is implemented.

[0034] Compared with the prior art, the method, device, equipment, medium and product for adjusting the mobility strategy of low-altitude terminals disclosed in the present invention configure different mobility strategies for non-low-altitude terminals and low-altitude terminals in a targeted manner, adopt the original ground mobility strategy for non-low-altitude terminals, and adopt a new low-altitude mobility strategy for low-altitude terminals. Compared with the prior art in which low-altitude terminals also uniformly adopt the ground mobility strategy, the embodiment of the present invention provides a mobility strategy suitable for low-altitude terminals, adopts a newly added bias, adjusts the difficulty of switching requests based on distance, and redefines the neighboring area relationship of low-altitude terminals to complete the switching process, solves the problem that the large-network antenna is facing the ground coverage, and only its upper side lobe can be used at low altitude, resulting in uneven energy, the existence of signal zero points, and thus the problem of coverage holes, and reduces the frequent switching of terminals in flight in coverage holes, resulting in unstable switching sequences, differences in test results of the same line at different times, and the low-altitude terminals receiving a large number of cell signals in the air, resulting in large interference, and other problems, effectively ensuring the communication quality of low-altitude terminals. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a flow chart of a method for adjusting a mobile strategy of a low-altitude terminal provided by an embodiment of the present invention;

[0036] Figure 2 is a schematic diagram of the principle of cell distance information in an embodiment of the present invention;

[0037] Figure 3 is a schematic diagram of the principle of initiating a switching request in an embodiment of the present invention;

[0038] Figure 4 It is a flow chart of a method for adjusting a mobile strategy of a low-altitude terminal preferably in an embodiment of the present invention;

[0039] Figure 5 It is a structural diagram of a mobile strategy adjustment device for a low-altitude terminal provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0042] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0043] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] See also Figure 1 , is a flow chart of a method for adjusting a mobile strategy of a low-altitude terminal provided by an embodiment of the present invention. An embodiment of the present invention provides a method for adjusting a mobile strategy of a low-altitude terminal, which is applied to a base station side. The method includes steps S11 to S13:

[0045] S11. Identify the terminal type of the terminal; wherein the terminal type is a low-altitude terminal or a non-low-altitude terminal;

[0046] S12. When the terminal is a low-altitude terminal, configuring a low-altitude mobility strategy for the low-altitude terminal;

[0047] S13: When the terminal is a non-low-altitude terminal, configure a ground mobility strategy for the non-low-altitude terminal.

[0048] In an embodiment of the present invention, in order to solve the problem in the prior art that the 5G wireless network low-altitude terminal still relies on the original ground mobility strategy during flight, and there is no special adjustment and optimization of the mobility strategy of the low-altitude terminal, a new mobility strategy for low-altitude terminals is set, which is different from the original ground mobility strategy, namely, the low-altitude mobility strategy.

[0049] During the application process, the terminal type is identified as a low-altitude terminal or a non-low-altitude terminal. When the terminal is determined to be a low-altitude terminal, a low-altitude mobility strategy is configured for the low-altitude terminal; when the terminal is determined to be a non-low-altitude terminal, a ground mobility strategy is configured for the non-low-altitude terminal.

[0050] Preferably, the low-altitude mobility strategy adopts a newly added bias, adjusts the difficulty of the handover request based on the distance, and redefines the neighboring area relationship of the low-altitude terminal to complete the handover process.

[0051] By adopting the technical means of the embodiment of the present invention, different mobility strategies are configured for non-low-altitude terminals and low-altitude terminals in a targeted manner. The original ground mobility strategy is adopted for non-low-altitude terminals, and the new low-altitude mobility strategy is adopted for low-altitude terminals. Compared with the situation in which low-altitude terminals also uniformly adopt the ground mobility strategy in the prior art, the embodiment of the present invention provides a mobility strategy suitable for low-altitude terminals, which solves the problem that the large-network antenna is facing the ground for coverage, and only its upper side lobe can be used at low altitude, resulting in uneven energy, the existence of signal zero points, and thus the problem of coverage holes. It also reduces the frequent switching of terminals in flight in coverage holes, resulting in unstable switching sequences, differences in test results of the same line at different times, and the low-altitude terminals will receive a large number of cell signals in the air, resulting in large interference, and other problems, effectively ensuring the communication quality of low-altitude terminals.

[0052] As a preferred implementation, the embodiment of the present invention is further implemented on the basis of the above embodiment, step S11, that is, the terminal type of the terminal is identified, specifically:

[0053] Determine the terminal type of the terminal according to the slice configuration information of the terminal or based on beam training;

[0054] or,

[0055] When receiving a switching request from a terminal, the terminal type of the terminal is identified based on whether the switching request carries a low-altitude terminal identifier; wherein the low-altitude terminal identifier is added by the source cell after determining that the terminal is a low-altitude terminal based on the terminal's slice configuration information or based on beam training.

[0056] In an embodiment of the present invention, the terminal will move between different cells. When the terminal is started in the source cell, the source cell will determine whether the terminal is a low-altitude terminal based on the terminal's slice configuration information or based on beam training, and configure the corresponding mobility strategy; when the terminal is ready to switch from the source cell to the target cell, it will send a switching request to the target cell. For the switching of low-altitude terminals, the source cell will add a low-altitude terminal identifier in the switching request. When the target cell receives the switching request, it can determine whether the terminal is a low-altitude terminal based on whether the low-altitude terminal identifier is carried in the switching request, and configure the corresponding mobility strategy after the terminal is switched in. Including measurement frequency, hysteresis, bias, neighboring cell configuration, switching trigger difficulty level, etc. After that, the cell still maintains periodic beam scanning and training process to determine whether the terminal maintains a low-altitude state. For terminals that are no longer low-altitude, it changes to a ground mobility strategy and re-issues the measurement configuration.

[0057] As a preferred implementation, the embodiment of the present invention further explains the terminal type determination method. The low-altitude terminal includes a fixed contract low-altitude terminal and a temporary low-altitude terminal; then the terminal type of the terminal is determined based on the slice configuration information of the terminal or based on beam training, including the following steps:

[0058] Acquire slice configuration information of the terminal, and when the slice configuration information meets the preset configuration requirements, determine that the terminal is a fixed contracted low-altitude terminal;

[0059] The beam management mechanism is used to perform beam training on the terminal; wherein the beam training includes downlink beam training and uplink beam training; after the downlink beam training is completed, the terminal continues to communicate with the configured non-ground coverage beam within a preset time period, and during the uplink beam training process, the terminal continues to use the preset downtilt beam within the preset time period, and the terminal is determined to be a temporary low-altitude terminal;

[0060] Otherwise, the terminal is determined to be a non-low-altitude terminal.

[0061] In the embodiment of the present invention, the whole scheme mainly includes three links: low-altitude terminal identification, low-altitude terminal identification transmission and low-altitude terminal mobility strategy change. In the embodiment of the present invention, the low-altitude terminal is divided into a fixed contract low-altitude terminal and a temporary low-altitude terminal. The fixed contract low-altitude terminal is judged by slice bias information, and the temporary low-altitude terminal is judged by beam training. If these two conditions are not met, it is considered to be a non-low-altitude terminal.

[0062] Fixed-contract low-altitude terminals are low-altitude contract users of the Internet of Things. When signing the SIM card, a special 5G slice is bound to it, which is specifically used for low-altitude flight services. The cell side determines that the terminal is a fixed-contract low-altitude terminal based on the slice information, and the cell also determines that the terminal is a temporary low-altitude terminal through uplink and downlink beam scanning and training. Furthermore, the cell side assigns low-altitude terminal identification to low-altitude terminals, including fixed-contract low-altitude terminals and temporary low-altitude terminals.

[0063] Specifically, when the user terminal is converted from an idle state to a connected state in a cell, the user terminal sends a Service request message to the AMF (Access and Mobility Management Function) to request the establishment of an N1 NAS (non-access layer) signaling connection, and / or request the establishment of user plane resources for a PDU (Protocol Data Unit) session without user plane resources. An IoT low-altitude user initiates a service request to a 5G cell through a special slice configuration (SST+SD). The cell side discovers through the slice configuration information that the user initiating the service request is an IoT low-altitude terminal, and then assigns the terminal an identifier of a fixed contracted low-altitude terminal.

[0064] Since low-altitude economy is a recent development direction and there is no method specifically for low-altitude terminals in the existing network to determine whether they are in a low-altitude state, a method for uniformly configuring mobility policies for all terminals is adopted. For terminals temporarily in a low-altitude state, the embodiment of the present invention uses the uplink and downlink beam scanning, beam measurement, beam reporting, and beam indication processes in the NR network to jointly determine whether the terminal UE is in a low-altitude environment.

[0065] Preferably, the following steps are used for determination:

[0066] A beam management mechanism is used to perform beam training on the terminal; wherein the beam training includes downlink beam training and uplink beam training;

[0067] After completing the downlink beam training, configuring a non-ground coverage beam for the terminal;

[0068] When the terminal continues to communicate with the non-ground coverage beam within a preset time period, determining that the terminal is a low-altitude terminal;

[0069] During the uplink beam training process, if the terminal continues to use a preset downtilt beam within a preset time period, the terminal is determined to be a temporary low-altitude terminal.

[0070] Specifically, the overall process of the beam management mechanism in NR mainly includes:

[0071] Beam scanning: The beam of the reference signal is sent to scan the space at predefined time intervals;

[0072] Beam measurement / decision: The UE measures the reference signal and selects the best beam.

[0073] Beam report: For UE, report beam measurement results;

[0074] Beam indication: The base station instructs the UE to select a specified beam;

[0075] Beam failure recovery: includes beam failure detection, new beam discovery, and beam recovery processes;

[0076] Among them, the reference signal used for downlink beam management includes:

[0077] Initial access in idle state: SSB (Synchronization Signal Block);

[0078] Connection state: CSI-RS (Channel Status Information-Reference Signal) or SSB;

[0079] Reference signals for uplink beam management:

[0080] Idle state initial access: PRACH (Physical Random Access Channel);

[0081] Connection state: SRS (Sounding Reference Signal, uplink sounding reference signal).

[0082] Furthermore, determining a temporary low-altitude terminal based on a downlink beam and determining a user position based on a downlink beam include two processes: an initial coarse beam determination and a later narrow beam determination.

[0083] The first process is based on the initial coarse beam determination of SSB: the downlink SSB signal of the existing NR (2.6G or 4.9G) contains 8 SSB blocks per half frame (5ms). Generally, it is sent in a certain beam direction in a round-robin manner. Before the UE initiates the initial access in the idle state, it performs SSB reception (implemented by the UE). When the SSB measurement result meets the RSRP (reference signal received power) threshold, this SSB beam (the strongest) is selected to send the PRACH process (based on the PRACH index carried by the SSB), otherwise any SSB beam can be selected; the PRACH sending time and the SSB index (beam) have a mapping association relationship, and the UE selects the associated PRACH sending time (uplink beam) to send MSG1; the base station determines the beam of the SSB where the UE is located based on the resource location of the UE uplink PRACH, and sends a downlink RAR (Random Access Response) (MSG2) on this beam. When the UE and the base station complete the initial access process, they complete the preliminary training process based on the SSB beam (coarse beam training). Based on this process, the base station side can obtain the coarse beam coverage range of the UE.

[0084] The second process is SSB-based narrow beam determination (downlink beam training): The SSB beam achieves coverage for initial access to the cell. In order to obtain better wireless performance, the base station can select a better beam transmission through the beam training process.

[0085] After the terminal enters the RRC (Radio Resource Control) connection state, the CSI-RS signal can be used for beam training in the downlink. The specific training strategy protocol is not specified and is implemented independently by each manufacturer. The general principle is: the base station sends multiple narrow beams (CSI-RS corresponds to CSI Resource Index, CRI) for beam scanning based on the initial access SSB beam. The UE keeps the receiving beam unchanged. The UE measures the CSI-RS reference signal to obtain the L1-RSRP result and reports the measurement results of different CRIs to the base station. The base station selects the beam corresponding to the CSI-RS with the strongest L1-RSRP for downlink channel indication (TCI). The TCI State information of PDSCH in the protocol is first configured in the RRC signaling (UE level), and a maximum of 128 are configured (a single SSB signal configures the corresponding 8 narrow beams). For the UE, the TClState list configured in the RRC signaling is a pool of various downlink beams (PDSCH / PDCCH / CSI-RS), and the base station needs to further indicate the specific beam information.

[0086] The static weight definition of the CSI-RS beam direction in the existing network is configured as 32 narrow beams, which are divided into 4 layers of height. It can be understood that each SSB beam corresponds to 4 CSI-RS beams (4 layers, divided according to the height of the terminal). The existing network CSI-RS beam is 32 beams, which are divided into 4 layers in the vertical direction and 8 narrow beams in each layer in the horizontal direction.

[0087] Downlink beam training is divided into two processes, namely downlink CSI-RS beam transmission beam training and downlink CSI-RS beam reception beam training. The cell side estimates the terminal position based on the preamble code fed back by the PRACH process, and configures the UE-level CSI-RS at the RRC level in the SSB beam direction according to the static relationship between the CSI-RS and the SSB signal. The terminal receives the RSRP corresponding to the feedback CRI (CSI-RS id), and the cell selects the beam weight based on the strongest RSRP (completing the downlink beam transmission training process), and repeatedly sends CSI-RS to the terminal with a narrow beam. After the terminal collects signals with multiple wide beams, it decides which narrow beam to receive the signal (completing the downlink beam reception training process).

[0088] The beam relationship is transmitted through QCL, that is, the CSI-RS BM (beam management) is relatively "close" to the previous downlink reference signal SSB beam, but not exactly the same. Therefore, training from a wide beam to a narrow beam can be performed in the downlink direction.

[0089] The cell side labels the CSI-RS user with non-ground coverage (compared to the CSI narrow beam configured in elevation mode for SSB signals) with the strongest CSI-RSRP fed back by the UE side, and maintains it for a certain period of time (the time threshold here can be defined on the GNB side, such as 5 seconds, that is, all PDCCH narrow beams (Resource 1) scheduled to cover the user within 5 seconds are non-ground coverage beams), and determines it as a suspected low-altitude terminal, and enters the next step of uplink beam training reconfirmation process.

[0090] SRS-based narrow beam determination (uplink beam training):

[0091] In the uplink direction, beam training is performed through SRS. The number of SRS resource sets used for beam management and the number of SRS resources in each resource set are related to UE capabilities and are defined in 3GPP 38.306. Multiple SRS resource sets used for beam management correspond to the TXPanel of the UE. The SRS Resource set in the SRS resource set corresponds to one beam, so multiple SRS Resources in one resource set cannot be sent at the same time, that is, only one beam can be sent at the same time. SRSResources in different resource sets can be sent at the same time (related to UE capabilities). The UE can only select one set of resources to send SRS at the same time. Beam training can be achieved by the UE performing beam scanning itself or by the gNB through receiving scanning.

[0092] SRS beam management: Resources for beam management are specially designed in the SRS configuration. If this resource is not configured, the uplink beam is determined by using the reciprocity of uplink and downlink. When the SRS resources for beam management are configured, high-level signaling configures one or more SRS-ResourceSets (resource sets, up to 16) through SRS-Config; each SRS-ResourceSet configures one or more SRS-Resources (K is up to 64). One SRSResource in the SRS resource set corresponds to one beam. Therefore, multiple SRS Resources in a resource set cannot be sent at the same time, that is, only one beam can be sent at the same time, and SRS Resources in different resource sets can be sent at the same time.

[0093] For uplink beam training, the spatialRelationlnfo (spatial relationship information) indicated by the base station specifies the corresponding uplink beam. The reference signal beams are exactly the same, and step-by-step beam refinement training is not supported. When the SRS resources in one or more SRS resource sets are configured with different transmit beams for spatialRelationlnfo, the UE performs transmit beam scanning, and the base station can keep the receive beam unchanged for uplink beam training.

[0094] For the terminal that is judged as a suspected low-altitude user by downlink beam training, its uplink beam training results are detected. If the UE side finally adopts a downtilt beam based on the uplink beam training PUSCH beam (in DCI 0_1 in PDCCH, the SRSresourceindicator field indicates the corresponding SRS resource to "implicitly" indicate the PUSCH uplink beam), and maintains a certain time period (the time threshold here can be defined on the GNB side, such as 5 seconds, that is, within 5 seconds, the beam Resource4 based on the SRS BM is a narrow beam in the downward direction of the user), then the low-altitude terminal is determined to be a temporary low-altitude terminal, and the user is marked with a temporary low-altitude terminal mark.

[0095] As a preferred implementation, the embodiment of the present invention is further implemented on the basis of the above embodiment, and the low-altitude terminal identifier is added to the low-altitude terminal through the following steps, including:

[0096] For a fixed contracted low-altitude terminal, obtain a low-altitude terminal identifier from the core network side, and add the low-altitude terminal identifier to the fixed contracted low-altitude terminal; wherein the low-altitude terminal identifier is generated by the core network after sensing the fixed contracted low-altitude terminal through slice information during the service request stage;

[0097] For a temporary low-altitude terminal, a low-altitude terminal identifier is generated during beam training, and the low-altitude terminal identifier is added to the temporary low-altitude terminal.

[0098] In an embodiment of the present invention, different methods are used to transmit the identification of fixed contracted low-altitude terminals and temporary low-altitude terminals. The identification of fixed contracted low-altitude terminals is sent from the core network side to the wireless network base station GNB side. Specifically, the core network perceives low-altitude users by slice information during the service request stage and sends it to the GNB side. The identification of temporary low-altitude terminals is determined by the wireless network GNB side autonomously based on beam training discovery.

[0099] A policy index registered by the operator in the UDM (Unified Data Management) database for fixed low-altitude terminals. During the initial registration process of the user, the AMF passes the fixed low-altitude terminal policy (index) to the GNB side through the NG interface. After the GNB side maps the index to the local configuration, it can provide special RRM policies for fixed low-altitude terminals based on the index, thereby providing targeted mobility policies.

[0100] UE initial access process: UDM passes the operator's configured low-altitude policy to AMF through the N8 interface message, and AMF passes the low-altitude index passed by UDM to the GNB side through the INITIAL CONTEXT SETUP REQUEST message.

[0101] NG link established: If the fixed low-altitude contracted terminal enters the connected state from the idle state, the AMF passes the low-altitude policy index transmitted by the UDM to the gNodeB through the DOWNLINKNAS TRANSPORT (downlink non-access layer transmission) message.

[0102] UE undergoes NG handover: the source GNB passes the low-altitude policy index to the AMF through the HANDOVER REQUIRED message, and then the AMF passes the low-altitude policy index to the target gNodeB through the HANDOVER REQUEST message.

[0103] UE undergoes Xn handover: The source GNB passes the low-altitude policy index obtained from the AMF to the target gNodeB through the HANDOVER REQUEST message.

[0104] The technical means of the embodiments of the present invention are adopted, wherein fixed contracted users are judged by slice configuration information, temporary users are judged by user beam scanning and training process jointly, and the low-altitude terminal attribute transmission is completed by adding a low-altitude terminal identifier during the switching process. The low-altitude terminal mobility strategy adopts different switching judgment strategies for users judged as low-altitude terminals to complete the switching process, thereby ensuring the communication quality of the low-altitude terminal without affecting the existing ground network.

[0105] As a preferred implementation, the embodiment of the present invention is further implemented on the basis of the above embodiment. In step S12, configuring a low-altitude mobility strategy for the low-altitude terminal includes:

[0106] When the low-altitude terminal is the first low-altitude terminal, the ground mobility strategy issued in the early stage is updated to the low-altitude mobility strategy for the low-altitude terminal; wherein the first low-altitude terminal is a low-altitude terminal determined by the cell through beam training and added with a low-altitude terminal identifier;

[0107] When the low-altitude terminal is a second low-altitude terminal, a low-altitude mobility strategy for the low-altitude terminal is directly issued after receiving the switching request or during the service establishment process; wherein, the second low-altitude terminal is a low-altitude terminal determined by other cells and added with a low-altitude terminal identifier.

[0108] In an embodiment of the present invention, user terminals carrying low-altitude terminal identifications are distinguished into low-altitude terminals identified in this cell (first low-altitude terminals), that is, the terminal is determined to be a low-altitude terminal by this cell through beam training, and low-altitude terminals whose low-altitude terminal identifications are transmitted by other cells (second low-altitude terminals), including fixed-contract low-altitude terminals or temporary low-altitude terminals switched in.

[0109] For low-altitude terminals identified in this cell, the wireless cell deletes the measurement configuration issued previously, that is, the original measurement configuration for ground users, and updates it to a new low-altitude mobility strategy for low-altitude terminals; for low-altitude terminals that transmit low-altitude terminal identification, a new low-altitude mobility strategy for low-altitude terminals is directly issued during the switching in or service establishment process.

[0110] As a preferred implementation, the low-altitude mobility strategy includes a switching bias; the switching bias is used to generate a trigger condition for a measurement report of an intra-frequency switching.

[0111] The low-altitude mobility strategy includes a reporting time interval offset; the reporting time interval offset is used to offset the reporting time interval of the measurement report.

[0112] The low-altitude mobility strategy includes distance information between a source cell and all switchable target cells; the distance information is used to set different switching difficulties for different target cells.

[0113] The low-altitude mobility strategy includes neighbor area differentiation configuration of low-altitude terminals and ground terminals, wherein the ground terminal adopts a linear mobility strategy to configure neighbor areas, and the low-altitude terminal adopts a surface mobility strategy to configure neighbor areas.

[0114] In an embodiment of the present invention, the following improvements are mainly made to the low-altitude mobility strategy for low-altitude terminals: adding a switching bias item, adding a measurement report reporting time interval bias, adding source cell and target cell distance judgment on the GNB side, and neighbor cell differentiation configuration for low-altitude terminals and ground terminals.

[0115] Specifically, increase the switching bias:

[0116] For low-altitude terminals, the measurement configuration mainly includes two parts: measurement object and report configuration. The new field is used to increase the switching bias. Take the existing A3 measurement report for co-frequency switching as an example:

[0117] It should be noted that the A3 event is a measurement report event defined in the 5G (NR) network. Specifically, the A3 event means that when the signal quality of the neighboring cell is better than the signal quality of the current serving cell by a certain offset, the terminal (UE) will trigger measurement and reporting. This event is usually used to decide whether the UE should switch to the neighboring cell to optimize network connectivity and user experience.

[0118] In 5G networks, the triggering conditions of the A3 event usually involve multiple parameters, including the signal quality of the serving cell and the adjacent cell (such as RSRP), offset (Offset), hysteresis parameter (Hysteresis), and trigger time (TimeToTrig), etc. When the signal quality of the adjacent cell exceeds that of the serving cell by a certain amount (i.e., the offset plus the signal quality of the serving cell) and lasts for a certain period of time (i.e., the trigger time), the A3 event will be triggered, and the UE will report this event to the network, prompting the network to perform a cell switching operation.

[0119] The existing A3 event entry conditions are: Mn+Ofn+Ocn-Hys>Ms+Ofs+Ocs+Off, and the A3 measurement report is reported after the above conditions last for TimeToTrig time.

[0120] In the embodiment of the present invention, the original Off is increased by a switching offset Off2, and for the terminal judged as low-altitude, the A3 event entry condition is changed to:

[0121] Mn+Ofn+Ocn-Hys>Ms+Ofs+Ocs+Off+Off2;

[0122] Among them, Off2 is a new switching bias specifically used for low-altitude terminals, which is set by the GNB side and is only sent to users determined to be low-altitude terminals. The terminal will be enabled only after receiving the special bias. If Off2 is not received, the bias is defined as 0.

[0123] Furthermore, increase the reporting time interval offset:

[0124] In the original measurement report, the TimeToTrig time interval is used as the judgment time. If the conditions are met within this time, the report is made for the first time. In the embodiment of the present invention, a new TimeToTrigoffset field is added under reportconfig. Two groups of cells are hung under the field. The TimeToTrigoffset1 cell exists in the form of multiples, indicating that the actual control time is changed to TimeToTrig*TimeToTrigoffset1; the TimeToTrigoffset2 cell exists in the form of offset, indicating that the actual control time is changed to TimeToTrig+TimeToTrigoffset2. When both exist, TimeToTrigoffset1 is selected.

[0125] Furthermore, the target cell distance information:

[0126] The source cell stores all the distance information of the handover target cells in advance, and divides the target cells into short-distance handover target cells, long-distance handover target cells, and ultra-long-distance handover target cells based on the relative distance threshold. Different handover difficulty levels are set for different target cells.

[0127] See also Figure 2 and Figure 3 , Figure 2 is a schematic diagram of the principle of cell distance information in an embodiment of the present invention, Figure 3 It is a schematic diagram of the principle of initiating a handover request in an embodiment of the present invention. After the low-altitude terminal reports the measurement report, the source cell performs a target cell analysis based on the measurement report for the handover purpose, and triggers different handover attempt difficulties for cells at different distances.

[0128] If the target cell is close, the handover request is forwarded to the target cell side, and a handover request is initiated once the MR is triggered.

[0129] If the target cell is far away, the first measurement report to the cell for handover is ignored, and the terminal is waited for to switch from event report to periodic report. After receiving the Nth periodic report in succession, a handover request is initiated to the target cell.

[0130] If it is an ultra-long-distance target cell, the first measurement report to the cell for switching is ignored, and the terminal is waited for to switch from event reporting to periodic reporting. After receiving the Mth periodic report continuously, a switching request is initiated to the target cell.

[0131] Furthermore, the neighboring cell configurations of low-altitude terminals and ground terminals are differentiated:

[0132] The cell side configures two different sets of neighboring cell strategies for ground terminals and low-altitude terminals. The ground terminals configure neighboring cells based on the user linear movement strategy, and the low-altitude terminals configure neighboring cells based on the surface movement strategy.

[0133] When a low-altitude terminal is flying at a low altitude, after the wireless side determines that it is a low-altitude terminal, the source cell side decides whether to initiate a handover request based on whether the target cell is configured as a low-altitude neighboring cell for the measurement report used for handover purposes.

[0134] See also Figure 4, is a flow chart of a method for adjusting the mobility strategy of a low-altitude terminal that is preferred in an embodiment of the present invention. For a terminal (fixed or temporary) that is judged to be a low-altitude user, when a handover occurs, a low-altitude terminal identifier is added to the Handover Request message (Xn handover) or Handover Required (N2 handover), which is used for transmitting the attributes of the low-altitude terminal between cells. Taking the Handover Request message (Xn handover) as an example, a Low altitude state information element is added to the UE HistoryInformation information element in the Handover Request signaling. 0 indicates that the cell has not judged it as a low-altitude terminal, and 1 indicates that the cell has judged it as a low-altitude terminal. The switching process carries the judgment of the low-altitude characteristics of the terminal by the cell, which is used for the target cell to promptly issue the low-altitude terminal mobility policy after the terminal is switched in. For the low-altitude terminal that is switched in, the target cell directly issues the mobility policy for the low-altitude terminal.

[0135] By adopting the technical means of the embodiment of the present invention, the cell side assigns a low-altitude terminal identifier to the low-altitude terminal, so that in the switching request process, a low-altitude terminal identifier is added to the signaling, and the target cell allocates different mobility measurement frequencies, hysteresis, bias, neighboring area configuration, switching trigger difficulty level and other mobility strategies for low-altitude users after they are cut in. For low-altitude terminals, a special switching bias and reporting time bias are added to adjust the switching difficulty. The cell side increases the reporting number based on the switching target cell distance level to trigger the switching request difficulty, and configures different neighboring area relationship groups for ground terminals and low-altitude terminals, so as to configure appropriate low-altitude mobility strategies for low-altitude terminals and ensure the communication quality of low-altitude terminals.

[0136] See also Figure 5 , is a structural diagram of a mobile strategy adjustment device for a low-altitude terminal provided by an embodiment of the present invention. The embodiment of the present invention provides a mobile strategy adjustment device 10 for a low-altitude terminal, including:

[0137] The terminal type identification module 11 is used to identify the terminal type of the terminal; wherein the terminal type is a low-altitude terminal or a non-low-altitude terminal;

[0138] A low-altitude mobility strategy allocation module 12, configured to configure a low-altitude mobility strategy for the low-altitude terminal when the terminal is a low-altitude terminal;

[0139] The ground mobility strategy allocation module 13 is used to configure a ground mobility strategy for the non-low-altitude terminal when the terminal is a non-low-altitude terminal.

[0140] As a preferred implementation, the terminal type identification module is specifically used for:

[0141] Determine the terminal type of the terminal according to the slice configuration information of the terminal or based on beam training;

[0142] or,

[0143] When receiving a switching request from a terminal, the terminal type of the terminal is identified based on whether the switching request carries a low-altitude terminal identifier; wherein the low-altitude terminal identifier is added by the source cell after determining that the terminal is a low-altitude terminal based on the terminal's slice configuration information or based on beam training.

[0144] As a preferred implementation, the low-altitude terminal includes a fixed contracted low-altitude terminal and a temporary low-altitude terminal; then judging the terminal type of the terminal according to the slice configuration information of the terminal or based on beam training includes:

[0145] Acquire slice configuration information of the terminal, and when the slice configuration information meets the preset configuration requirements, determine that the terminal is a fixed contracted low-altitude terminal;

[0146] The beam management mechanism is used to perform beam training on the terminal; wherein the beam training includes downlink beam training and uplink beam training; after the downlink beam training is completed, the terminal continues to communicate with the configured non-ground coverage beam within a preset time period, and during the uplink beam training process, the terminal continues to use the preset downtilt beam within the preset time period, and the terminal is determined to be a temporary low-altitude terminal;

[0147] Otherwise, the terminal is determined to be a non-low-altitude terminal.

[0148] As a preferred implementation, a low-altitude terminal identifier is added to the low-altitude terminal through the following steps:

[0149] For a fixed contracted low-altitude terminal, obtain a low-altitude terminal identifier from the core network side, and add the low-altitude terminal identifier to the fixed contracted low-altitude terminal; wherein the low-altitude terminal identifier is generated by the core network after sensing the fixed contracted low-altitude terminal through slice information during the service request stage;

[0150] For a temporary low-altitude terminal, a low-altitude terminal identifier is generated during beam training, and the low-altitude terminal identifier is added to the temporary low-altitude terminal.

[0151] As a preferred implementation, the low-altitude mobility strategy allocation module 12 is specifically used for:

[0152] When the low-altitude terminal is the first low-altitude terminal, the ground mobility strategy issued in the early stage is updated to the low-altitude mobility strategy for the low-altitude terminal; wherein the first low-altitude terminal is a low-altitude terminal determined by the cell through beam training and added with a low-altitude terminal identifier;

[0153] When the low-altitude terminal is a second low-altitude terminal, a low-altitude mobility strategy for the low-altitude terminal is directly issued after receiving the switching request or during the service establishment process; wherein, the second low-altitude terminal is a low-altitude terminal determined by other cells and added with a low-altitude terminal identifier.

[0154] As a preferred implementation, the low-altitude mobility strategy includes a switching bias; the switching bias is used to generate a trigger condition for a measurement report of an intra-frequency switching.

[0155] The low-altitude mobility strategy includes a reporting time interval offset; the reporting time interval offset is used to offset the reporting time interval of the measurement report.

[0156] The low-altitude mobility strategy includes distance information between a source cell and all switchable target cells; the distance information is used to set different switching difficulties for different target cells.

[0157] The low-altitude mobility strategy includes neighbor area differentiation configuration of low-altitude terminals and ground terminals, wherein the ground terminal adopts a linear mobility strategy to configure neighbor areas, and the low-altitude terminal adopts a surface mobility strategy to configure neighbor areas.

[0158] By adopting the technical means of the embodiment of the present invention, different mobility strategies are configured for non-low-altitude terminals and low-altitude terminals in a targeted manner. The original ground mobility strategy is adopted for non-low-altitude terminals, and the new low-altitude mobility strategy is adopted for low-altitude terminals. Compared with the prior art in which low-altitude terminals also uniformly adopt the ground mobility strategy, the embodiment of the present invention provides a mobility strategy suitable for low-altitude terminals, adopts a new bias, adjusts the difficulty of switching requests based on distance, and redefines the neighboring area relationship of low-altitude terminals to complete the switching process, solves the problem that the large-network antenna is facing the ground coverage, and only its upper side lobe can be used at low altitude, resulting in uneven energy, the existence of signal zero points, and thus the problem of coverage holes, and reduces the frequent switching of terminals in flight in coverage holes, resulting in unstable switching sequences, differences in test results of the same line at different times, and low-altitude terminals will receive a large number of cell signals in the air, resulting in large interference, and other problems, effectively ensuring the communication quality of low-altitude terminals.

[0159] It should be noted that the mobile strategy adjustment device for a low-altitude terminal provided in an embodiment of the present invention is used to execute all the process steps of the mobile strategy adjustment method for a low-altitude terminal in the above-mentioned embodiment. The working principles and beneficial effects of the two correspond one to one, and therefore will not be repeated here.

[0160] An embodiment of the present invention also provides a mobile strategy adjustment device for a low-altitude terminal, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, it implements the mobile strategy adjustment method for the low-altitude terminal as described in any one of the above embodiments.

[0161] An embodiment of the present invention also provides a computer-readable storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the mobile strategy adjustment method of the low-altitude terminal as described in any one of the above embodiments.

[0162] An embodiment of the present invention also provides a computer program product, which includes a computer program or computer instructions. When the computer program or the computer instructions are executed by a processor, the method for adjusting the mobile strategy of a low-altitude terminal as described in any one of the above embodiments is implemented.

[0163] A person skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium, and when the program is executed, it can include the processes of the embodiments of the above-mentioned methods. The storage medium can be a disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM), etc.

[0164] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for adjusting the mobility strategy of a low-altitude terminal, characterized in that: include: Identify the terminal type of the terminal; wherein the terminal type is a low-altitude terminal or a non-low-altitude terminal; When the terminal is a low-altitude terminal, configuring a low-altitude mobility strategy for the low-altitude terminal; When the terminal is a non-low-altitude terminal, a ground mobility strategy is configured for the non-low-altitude terminal.

2. The method for adjusting the mobility strategy of a low-altitude terminal according to claim 1, characterized in that: The terminal type of the identification terminal is specifically: Determine the terminal type of the terminal according to the slice configuration information of the terminal or based on beam training; or, When receiving a switching request from a terminal, the terminal type of the terminal is identified based on whether the switching request carries a low-altitude terminal identifier; wherein the low-altitude terminal identifier is added by the source cell after determining that the terminal is a low-altitude terminal based on the terminal's slice configuration information or based on beam training.

3. The method for adjusting the mobile strategy of a low-altitude terminal according to claim 2, characterized in that: The low-altitude terminals include fixed contracted low-altitude terminals and temporary low-altitude terminals; Then, judging the terminal type of the terminal according to the slice configuration information of the terminal or based on beam training includes: Acquire slice configuration information of the terminal, and when the slice configuration information meets the preset configuration requirements, determine that the terminal is a fixed contracted low-altitude terminal; The beam management mechanism is used to perform beam training on the terminal; wherein the beam training includes downlink beam training and uplink beam training; after the downlink beam training is completed, the terminal continues to communicate with the configured non-ground coverage beam within a preset time period, and during the uplink beam training process, the terminal continues to use the preset downtilt beam within the preset time period, and the terminal is determined to be a temporary low-altitude terminal; Otherwise, the terminal is determined to be a non-low-altitude terminal.

4. The method for adjusting the mobility strategy of a low-altitude terminal according to claim 3, characterized in that: Follow the steps below to add a low-altitude terminal logo to the low-altitude terminal: For a fixed contracted low-altitude terminal, obtain a low-altitude terminal identifier from the core network side, and add the low-altitude terminal identifier to the fixed contracted low-altitude terminal; wherein the low-altitude terminal identifier is generated by the core network after sensing the fixed contracted low-altitude terminal through slice information during the service request stage; For a temporary low-altitude terminal, a low-altitude terminal identifier is generated during beam training, and the low-altitude terminal identifier is added to the temporary low-altitude terminal.

5. The method for adjusting the mobility strategy of a low-altitude terminal according to claim 1, characterized in that: The configuring a low-altitude mobility strategy for the low-altitude terminal includes: When the low-altitude terminal is the first low-altitude terminal, the ground mobility strategy issued in the early stage is updated to the low-altitude mobility strategy for the low-altitude terminal; wherein the first low-altitude terminal is a low-altitude terminal determined by the cell through beam training and added with a low-altitude terminal identifier; When the low-altitude terminal is a second low-altitude terminal, a low-altitude mobility strategy for the low-altitude terminal is directly issued after receiving the switching request or during the service establishment process; wherein, the second low-altitude terminal is a low-altitude terminal determined by other cells and added with a low-altitude terminal identifier.

6. The method for adjusting the mobility strategy of a low-altitude terminal according to claim 1, characterized in that: The low-altitude mobility strategy includes a switching bias; the switching bias is used to generate a trigger condition for a measurement report of the same-frequency switching.

7. The method for adjusting the mobile strategy of a low-altitude terminal according to claim 1, characterized in that: The low-altitude mobility strategy includes a reporting time interval offset; the reporting time interval offset is used to offset the reporting time interval of the measurement report.

8. The method for adjusting the mobility strategy of a low-altitude terminal according to claim 1, characterized in that: The low-altitude mobility strategy includes distance information between a source cell and all switchable target cells; the distance information is used to set different switching difficulties for different target cells.

9. The method for adjusting the mobility strategy of a low-altitude terminal according to claim 1, characterized in that: The low-altitude mobility strategy includes neighbor area differentiation configuration of low-altitude terminals and ground terminals, wherein the ground terminal adopts a linear mobility strategy to configure neighbor areas, and the low-altitude terminal adopts a surface mobility strategy to configure neighbor areas.

10. A mobile strategy adjustment device for a low-altitude terminal, characterized in that: include: A terminal type identification module, used to identify the terminal type of the terminal; wherein the terminal type is a low-altitude terminal or a non-low-altitude terminal; A low-altitude mobility strategy allocation module, used for configuring a low-altitude mobility strategy for the low-altitude terminal when the terminal is a low-altitude terminal; The ground mobility strategy allocation module is used to configure a ground mobility strategy for the non-low-altitude terminal when the terminal is a non-low-altitude terminal.

11. A mobile strategy adjustment device for a low-altitude terminal, characterized in that: It includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, it implements the mobile strategy adjustment method of the low-altitude terminal as described in any one of claims 1 to 9.

12. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the mobile strategy adjustment method for the low-altitude terminal as described in any one of claims 1 to 9.

13. A computer program product, characterized in that The computer program product includes a computer program or a computer instruction, and when the computer program or the computer instruction is executed by a processor, the method for adjusting the mobile strategy of a low-altitude terminal as described in any one of claims 1 to 9 is implemented.

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