Method for wireless communication of air user equipment

Abstract

The present disclosure describes methods, systems, and devices for selecting resources in wireless communications. A particular configuration and associated application conditions are sent from a user equipment to a base station. The particular configuration indicates a subset of synchronization signal blocks (SSBs) including a plurality of SSBs and / or an SSB reference signal received power (RSRP) threshold. If the associated application condition is satisfied, the SSB is selected based on the particular configuration. A RACH resource is selected based on the selected SSB. And sending the RACH lead code on the selected RACH resource.

Description

Technical Field

[0001] The present subject matter generally relates to wireless communications. In particular, the present subject matter relates to methods, devices, and systems for selecting resources in wireless communications. Background Art

[0002] In recent years, global interest in services based on drones (UAVs) has increased dramatically. Multiple drone operations, personal flying entertainment experiences, cargo delivery, etc. are some example use cases. These and other uses may depend on enhanced remote control capabilities and data transmission, which are of interest to service providers / operators as well as drone manufacturers. The original New Radio (NR) design was not intended for use with UAVs and therefore has various shortcomings, limitations and disadvantages. Therefore, there is a need for the creative methods, devices and systems described herein. Summary of the invention

[0003] The present subject matter relates to a method, device and system for improving wireless communication procedures and signaling for over-the-air user equipment (UE), as well as interaction and coordination procedures between base stations.

[0004] In some embodiments, a method for wireless communication performed by a user equipment (UE) includes receiving a specific configuration and associated applicable conditions from a base station. The specific configuration includes a synchronization signal block (SSB) subset of a plurality of SSBs; and / or an SSB reference signal received power (RSRP) threshold. The method also includes selecting an SSB based on the SSB configuration if the associated applicable conditions are met. The method also includes selecting a RACH resource based on the selected SSB. The method also includes sending a RACH preamble on the selected RACH resource.

[0005] In some embodiments, a method for wireless communication performed by a base station includes sending a specific configuration and associated applicable conditions to an airborne UE. Specifically including multiple SSB S SSB set; and / or SSB RSRP threshold.

[0006] In some embodiments, a method for wireless communications performed by a user equipment (UE) includes: receiving a measurement configuration and an associated applicability condition; and applying the measurement configuration when the associated applicability condition is satisfied.

[0007] In some embodiments, a method for wireless communication performed by a base station includes: configuring specific RACH resources and associated applicable conditions, wherein the RACH resources are RACH opportunities or RACH preambles; and the specific RACH resources are configured in one or more of the following items: a first initial uplink BWP of a serving cell; a second initial uplink BWP configured for a UE; or a dedicated uplink BWP.

[0008] In some other embodiments, a device for wireless communication may include a memory storing instructions and a processing circuit system in communication with the memory. When the processing circuit system executes the instructions, the processing circuit system is configured to perform the above method.

[0009] In some other embodiments, a device for wireless communication may include a memory storing instructions and a processing circuit system in communication with the memory. When the processing circuit system executes the instructions, the processing circuit system is configured to perform the above method.

[0010] In some other embodiments, a computer-readable medium includes instructions that, when executed by a computer, cause the computer to perform the above method.

[0011] The above and other aspects and implementations thereof are described in more detail in the drawings, the description and the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 An example of a wireless communication system including one wireless base station and one or more user equipments is shown.

[0013] Figure 2 An example of a base station is shown.

[0014] Figure 3 An example of a user device is shown.

[0015] Figure 4 An example communication system including a base station, user equipment, and air user equipment is shown.

[0016] Figure 5 An example communication between a base station and a user equipment is shown. DETAILED DESCRIPTION

[0017] The present subject matter will now be described in detail hereinafter with reference to the accompanying drawings, which form a part of the present subject matter and show by way of illustration specific examples of embodiments. However, it is noted that the present subject matter may be embodied in a variety of different forms and, therefore, the subject matter covered or claimed is intended to be construed as not being limited to any of the embodiments set forth below.

[0018] Throughout the specification and claims, terms may have subtle meanings that are implied or suggested in the context rather than explicitly defined. Similarly, the phrases "in one embodiment" or "in some embodiments" used herein do not necessarily refer to the same embodiment, and the phrases "in another embodiment" or "in other embodiments" used herein do not necessarily refer to different embodiments. The phrases "in one implementation" or "in some implementations" used herein do not necessarily refer to the same implementation, and the terms "in another implementation" or "in other implementations" used herein do not necessarily refer to different implementations. For example, the claimed subject matter includes combinations of example embodiments or implementations (all or part).

[0019] In general, terms can be understood at least in part from usage in context. For example, terms used herein (such as "and", "or", "and / or") can include multiple meanings, which can depend at least in part on the context in which such terms are used. Typically, "or" if used in an associative list, such as A, B, or C, means A, B, and C, which are used here in an inclusive sense, and A, B, or C, which are used here only in an exclusive sense. In addition, the terms "one or more" or "at least one" used herein (depending at least in part on the context) can be used to describe any feature, structure, or characteristic in a singular sense, or can be used to describe a combination of features, structures, and characteristics in a plural sense. Similarly, terms such as "one", "an", or "the" can also be understood to convey singular or plural usage, which depends at least in part on the context. In addition, the term "based on" or "determined by..." can be understood to not necessarily be intended to convey a set of exclusive factors, but rather, other factors that are not necessarily explicitly described can be allowed to exist, which again depends at least in part on the context.

[0020] Figure 1 A diagram of an example wireless communication system 100 is shown that includes a plurality of communication nodes (or simply nodes) configured to wirelessly communicate with each other. In general, the communication nodes include at least one user equipment 102 and at least one radio access node 104. Figure 1 The example wireless communication system 100 in FIG. 1 is shown as including two user equipments 102 (including a first user equipment 102(1) and a second user equipment 102(2)) and one wireless access node 104. However, various other examples of the wireless communication system 100 including any of various combinations of one or more user equipments 102 and / or one or more wireless access nodes 104 are also possible.

[0021] Generally, the user equipment described herein (such as user equipment 102) may include a single electronic device or apparatus capable of wireless communication over a network, or multiple (e.g., a network thereof) electronic devices or apparatuses. The user equipment may include or otherwise be referred to as a user terminal, user terminal device, or user equipment (UE). In addition, the user device may be or include, but is not limited to, a mobile device (such as a mobile phone, a smart phone, a smart watch, a tablet, a laptop, a vehicle or other vessel (as a non-limiting example, a person, a motor or an engine driven, such as a car, an airplane, a train, a boat or a bicycle), or a fixed or stationary device (as a non-limiting example, such as a desktop computer or other computing device that is not usually moved for a long time, such as an appliance, other relatively heavy equipment (including the Internet of Things (IoT)), or a computing device used in a commercial or industrial environment). In various embodiments, the user device 102 may include a transceiver circuit system 106 coupled to an antenna 108 to implement wireless communication with the wireless access node 104. The transceiver circuit system 106 may also be coupled to a processor 110, which may also be coupled to a memory 112 or other storage device. The memory 112 may store therein instructions or codes that, when read and executed by the processor 110, cause the processor 110 to implement the various methods described herein.

[0022] In addition, in general, a wireless access node (such as wireless access node 104) as described herein may include a single electronic device or apparatus, or multiple (e.g., a network thereof) electronic devices or apparatuses, and may include one or more base stations or other wireless network access points capable of wirelessly communicating with one or more user devices and / or one or more other wireless access nodes over a network. For example, in various embodiments, the wireless access node 104 may include a 4G LTE base station, a 5G NR base station, a 5G central unit base station, a 5G distributed unit base station, a next generation Node B (gNB), an enhanced Node B (eNB), or other similar or next generation (e.g., 6G) base station. The wireless access node 104 may include a transceiver circuit system 114 coupled to an antenna 116 (which may include an antenna tower 118 in various approaches) to enable wireless communication with the user device 102 or another wireless access node 104. The transceiver circuit system 114 may also be coupled to one or more processors 120, which may also be coupled to a memory 122 or other storage device. The memory 122 may store therein instructions or codes that, when read and executed by the processor 120 , cause the processor 120 to implement one or more of the methods described herein.

[0023] In various embodiments, two communication nodes in the wireless system 100 (such as a user device 102 and a wireless access node 104, two user devices 102 without a wireless access node 104, or two wireless access nodes 104 without a user device 102) can be configured to communicate wirelessly with each other in or through a mobile network and / or a wireless access network according to one or more standards and / or specifications. In general, the standards and / or specifications can define rules or procedures under which communication nodes can communicate wirelessly, which in various embodiments can include rules and procedures for communicating in millimeter (mm) bands and / or using multi-antenna schemes and beamforming functions. Additionally or alternatively, the standards and / or specifications are standards and / or specifications that define radio access technologies and / or cellular technologies, such as fourth generation (4G) long term evolution (LTE), fifth generation (5G) new radio (NR), or new radio unlicensed (NR-U), as non-limiting examples.

[0024] In addition, in the wireless system 100, the communication nodes are configured to wirelessly transmit signals between each other. Generally, the communication between two communication nodes in the wireless system 100 can be or include transmission or reception, and is usually performed simultaneously, depending on the perspective of the specific nodes in the communication. For example, for a given communication between a first node and a second node, where the first node is sending a signal to the second node and the second node is receiving a signal from the first node, the first node can be referred to as a source or sending node or device, the second node can be referred to as a destination or receiving node or device, and the communication can be considered to be a transmission for the first node and a reception for the second node. Of course, since the communication nodes in the wireless system 100 can send and receive signals, a single communication node can be a sending / source node and a receiving / destination node at the same time, or switch between being a source / sending node and a destination / receiving node.

[0025] In addition, a specific signal may be characterized or defined as an uplink (UL) signal, a downlink (DL) signal, or a sidelink (SL) signal. An uplink signal is a signal sent from a user equipment 102 to a wireless access node 104. A downlink signal is a signal sent from a wireless access node 104 to a user equipment 102. A sidelink signal is a signal sent from one user equipment 102 to another user equipment 102, or a signal sent from one wireless access node 104 to another wireless access node 104. In addition, for sidelink transmission, the first / source user equipment 102 directly sends the sidelink signal to the second / destination user equipment 102 without forwarding the sidelink signal to the wireless access node 104.

[0026] In addition, signals transmitted between communication nodes in the system 100 can be characterized or defined as data signals or control signals. In general, data signals are signals that include or carry data, such as multimedia data (e.g., voice and / or image data), and control signals are signals that carry control information that configures the communication nodes to communicate with each other in some way, or otherwise controls how the communication nodes transmit data signals to each other. In addition, certain signals can be defined or characterized by a combination of data / control and uplink / downlink / sidelink, including uplink control signals, uplink data signals, downlink control signals, downlink data signals, sidelink control signals, and sidelink data signals.

[0027] For at least some specifications, such as 5G NR, data signals and control signals are sent and / or carried on physical channels. Typically, a physical channel corresponds to a set of time-frequency resources for signal transmission. Different types of physical channels can be used to send different types of signals. For example, a physical data channel (or only a data channel) is used to send data signals, while a physical control channel (or only a control channel) is used to send control signals. Example types of physical data channels include, but are not limited to, a physical downlink shared channel (PDSCH) for transmitting downlink data signals, a physical uplink shared channel (PUSCH) for transmitting uplink data signals, and a physical sidelink shared channel (PSSCH) for transmitting sidelink data signals. In addition, example types of physical control channels include, but are not limited to, a physical downlink control channel (PDCCH) for transmitting downlink control signals, a physical uplink control channel (PUCCH) for transmitting uplink control signals, and a physical sidelink control channel (PSCCH) for transmitting sidelink control signals. As used herein for simplicity, unless otherwise specified, a particular type of physical channel is also used to refer to a signal sent on a physical channel of that particular type, and / or a transmission on that particular type of transmission. As an example, PDSCH refers to the physical downlink shared channel itself, a downlink data signal sent on the PDSCH, or a downlink data transmission. Thus, a communication node sending or receiving a PDSCH indicates that the communication node is sending or receiving a signal on the PDSCH.

[0028] In addition, for at least some specifications, such as 5G NR, and / or for at least some types of control signals, the control signal sent by the communication node may include control information including information necessary to enable transmission of one or more data signals between the communication nodes and / or to schedule one or more data channels (or one or more transmissions on the data channels). For example, such control information may include information necessary to correctly receive, decode and demodulate data signals received on a physical data channel during data transmission, and / or information necessary for an uplink scheduling grant to inform a user equipment of resources and a transmission format to be used for uplink data transmission. In some embodiments, the control information includes downlink control information (DCI) sent from the radio access node 104 to the user equipment 102 in the downlink direction. In other embodiments, the control information includes uplink control information (UCI) sent from the user equipment 102 to the radio access node 104 in the uplink direction, or sidelink control information (SCI) sent from one user equipment 102(1) to another user equipment 102(2) in the sidelink direction.

[0029] In addition, in the wireless communication system 100, the slot format of the plurality of slots or frames may be configured by the wireless access node 104 or specified by the protocol. In some examples, the slots may be indicated or specified as downlink slots, flexible slots, or uplink slots. In addition, in various embodiments, orthogonal frequency division multiplexing (OFDM) symbols may be indicated or specified as downlink symbols, flexible symbols, or uplink symbols.

[0030] Figure 2 An example of a base station 200 is shown. The example base station 200 may include a radio transmit / receive (Tx / Rx) circuit system 208 for transmitting / receiving communications with UEs and / or other base stations. The base station 200 may also include a network interface circuit system 209 for enabling the base station to communicate with other base stations and / or a core network, such as an optical or wired interconnect, Ethernet, and / or other data transmission media / protocols. The base station 200 may optionally include an input / output (I / O) interface 206 for communicating with an operator or the like.

[0031] Base station 200 may also include system circuitry 204. System circuitry 204 may include processor(s) 221 and / or memory 222. Memory 222 may include operating system 224, instructions 226, and parameters 228. Instructions 226 may be configured for one or more of processors 124 to perform functions of the base station. Parameters 228 may include parameters for supporting the execution of instructions 226. For example, the parameters may include network protocol settings, bandwidth parameters, radio frequency mapping assignments, and / or other parameters.

[0032] Figure 3 An example of an electronic device for implementing a terminal device 300 (e.g., a user equipment (UE)) is shown. UE 300 may be a mobile device, such as a smart phone or a mobile communication module provided in a vehicle. UE 300 may include a communication interface 302, a system circuit system 304, an input / output interface (I / O) 306, a display circuit system 308, and a memory 309. The display circuit system may include a user interface 310. The system circuit system 304 may include any combination of hardware, software, firmware, or other logic / circuitry systems. The system circuit system 304 may be implemented, for example, with one or more systems on a chip (SoC), application specific integrated circuits (ASICs), discrete analog and digital circuits, and other circuit systems. The system circuit system 304 may be part of the implementation of any desired function in UE 300. In this regard, the system circuit system 304 may include logic to facilitate, for example, decoding and playing music and videos, such as MP3, MP4, MPEG, AVI, FLAC, AC3 or WAV decoding and playback; running applications; accepting user input; saving and retrieving application data; establishing, maintaining and terminating cellular phone calls or data connections, such as Internet connections; establishing, maintaining and terminating wireless network connections, Bluetooth connections or other connections; and displaying relevant information on the user interface 310. The user interface 310 and the input / output (I / O) interface 306 may include a graphical user interface, a touch-sensitive display, tactile feedback or other tactile output, voice or facial recognition input, buttons, switches, speakers, and other user interface elements. Additional examples of the I / O interface 306 may include microphones, video and still image cameras, temperature sensors, vibration sensors, rotation and orientation sensors, headphone and microphone input / output jacks, universal serial bus (USB) connectors, memory card slots, radiation sensors (e.g., IR sensors), and other types of inputs.

[0033] refer to Figure 3, the communication interface 302 may include a radio frequency (RF) transmission (Tx) and reception (Rx) circuit system 316 for processing signal transmission and reception through one or more antennas 314. The communication interface 302 may include one or more transceivers. The transceiver may be a wireless transceiver that includes a modulation / demodulation circuit system, a digital-to-analog converter (DAC), a shaping table, an analog-to-digital converter (ADC), a filter, a waveform shaper, a filter, a preamplifier, a power amplifier and / or other logic for transmitting and receiving through one or more antennas or (for some devices) through a physical (e.g., wired) medium. The signals sent and received may follow any of a variety of formats, protocols, modulations (e.g., QPSK, 16-QAM, 64-QAM, or 256-QAM), frequency channels, bit rates, and encodings. As a specific example, the communication interface 302 may include a transceiver that supports transmission and reception under 2G, 3G, BT, WiFi, Universal Mobile Telecommunications System (UMTS), High Speed ​​Packet Access (HSPA) +, 4G / Long Term Evolution (LTE), and 5G standards. However, the techniques described below are applicable to other wireless communication technologies, whether produced by the 3rd Generation Partnership Project (3GPP), the GSM Association, 3GPP2, IEEE, or other partners or standards bodies.

[0034] refer to Figure 3 , the system circuit system 304 may include one or more processors 321 and a memory 322. The memory 322 stores, for example, an operating system 324, instructions 326, and parameters 328. The processor 321 is configured to execute the instructions 326 to implement the desired functions of the UE 300. The parameters 328 may provide and specify configuration and operating options for the instructions 326. The memory 322 may also store any BT, WiFi, 3G, 4G, 5G, or other data that the UE 300 will send or has received through the communication interface 302. In various implementations, the system power for the UE 300 may be provided by a power storage device such as a battery or a transformer.

[0035] This subject matter describes several example embodiments, which may be described in part or in whole in reference to Figure 1-Figure 4 The described base station 200 and / or the UE 400 and UE 300 in the air are implemented.

[0036] refer to Figure 4 , the present subject matter relates to communication procedures and signaling when used with an airborne UE 400 and / or an airborne UE 400. For example, random access channel (RACH) procedures, radio resource management (RRM) measurements when in a radio resource control (RRC) CONNECTED mode, RRC IDLE mode, and RRC INACTIVE mode, mobility, and cell selection / reselection will be further described.

[0037] The present subject matter discloses two altitude reporting events for use with LTE, denoted as H1 and H2. As used herein, altitude refers to the altitude of an airborne UE 400 or UE 300. With these two new events, an airborne UE 400 can trigger an altitude report when the altitude of the airborne UE 400 reaches a threshold value higher than (i.e., event H1) or lower than (i.e., event H2) one or more predetermined base station configurations. The airborne UE 400 can determine whether its current altitude is higher or lower than a predetermined threshold by comparing, for example, a value read from an altimeter sensor with one or more predetermined thresholds. In addition, according to the present subject matter, the RRM measurement network can be extended so that if a configurable number of cells meet event conditions, the airborne UE 400 can be configured to trigger a signal strength measurement report, such as A3, A4, and / or A5. These enhancements to LTE can help the base station (eNB) 200 determine whether the airborne UE 400 is airborne and / or can allow the base station 200 to detect whether the airborne UE 400 is causing interference and / or is experiencing interference.

[0038] The present subject matter discloses RRC signaling to improve mobility performance by allowing the UE to indicate its planned flight path to the base station 200. The airborne UE 400 may indicate where the airborne UE 400 plans to travel in the future, which may be considered by the base station 200 for mobility purposes; for example, the base station 200 may be able to use the airborne UE 400 travel information to predict where the airborne UE 400 may be suitable to be transmitted to and whether a new X2 connection is conducive to establishment.

[0039] The present subject matter discloses signaling from a core network (CN) to a base station 200 to allow the base station 200 to determine whether a user of an air UE 400 has a suitable subscription. The signaling may include information about whether the air UE's subscription supports air UE functionality. The base station 200 may use this information in any suitable manner depending on the implementation.

[0040] RACH resource selection

[0041] In a conventional NR system, RACH resources may be associated with synchronization signal (SS) / physical broadcast channel (PBCH) blocks (also referred to as synchronization signal block (SSB) transmissions) in a cell. Different SSBs may be transmitted in different beams, which may be transmitted in different directions. The aerial UE 400 may perform RACH resource selection based on measuring the signal strength of each detected SSB. That is, if available, the aerial UE 400 may select a RACH resource associated with an SSB having a reference signal received power (RSRP) value that meets or exceeds a predetermined threshold. The base station 200 may then identify which downlink beam may be used to send subsequent Msg2, Msg4, or MsgA based on the RACH resource selected by the aerial UE 400.

[0042] RRM Measurements

[0043] In a conventional NR system, RRM measurements can perform serving cell and neighboring cell measurements in RRC CONNECTED mode, idle measurements in RRC IDLE mode and RRC INACTIVE mode, and cell selection and reselection in RRC IDLE mode and RRC INACTIVE mode. RRM measurements can be performed on reference signaling (e.g., SSB or channel state information reference signal (CSI-RS)). The base station 200 can configure RRM measurements via system information (SI) or dedicated RRC messages. SI is downlink broadcast information periodically sent by the base station 200 to (multiple) UEs. Using SI, the UE can determine how to access the network. A typical RRM measurement configuration may include frequency, SSB to be measured, the number of reference signals used to derive the radio quality of the cell, and SSB measurement timing configuration (SMTC). The aerial UE 400 can measure the SSB within the configured SMTC.

[0044] When the airborne UE 400 is flying, it can initiate a RACH process for various reasons, such as switching, RRC reconstruction, beam failure recovery, small data transmission, SCell addition, and SCG addition. In the conventional NR specification, the base station 200 configures the mapping between the SSB index sent in the cell and the RACH resource. The RACH resource includes a RACH time slot (opportunity) and a preamble. The UE300 selects the RACH resource based on the signal strength measurement result of the SSB sent in the cell. When the signal strength measurement result of the SSB (i.e., RSRP) exceeds a predetermined threshold, the UE selects the SSB and the corresponding RACH resource for initiating the RACH process, and sends the RACH preamble on the corresponding RACH resource. The base station 200 then identifies the downlink beam selected by the UE300 based on the RACH resource selected by the UE300. The base station 200 can also schedule any of the subsequent downlink messages, including Msg2, Msg4, or MsgA, during the RACH process using the downlink beam selected by the UE.

[0045] According to the present subject matter, in order to provide services to the aerial UE 400, some beams 410 may be transmitted at different angles according to the altitude of the aerial UE 400 in flight, so as to provide better signal quality to the aerial UE 400. For example, in order to provide services to the UE 300 on the ground or at low altitude, the beam 405 may be transmitted in a direction pointing to the ground. While the altitude of the aerial UE 400 may be as high as 8,800 meters, in order to serve the aerial UE 400, the beam 410 may be transmitted at a larger angle (compared with the beam 405 for the UE 300 on the ground). The beams 410 transmitted at different angles may be different from the beams 405 for the terrestrial UE 300. As used herein, the term "terrestrial" refers to a UE 300 or aerial UE 400 located on the ground, attached to the ground, or at a low altitude below a first altitude threshold.

[0046] According to the present subject matter, by indicating to the aerial UE 400 the beams intended for reception by the aerial UE 400, the aerial UE 400 can perform signal strength measurements with higher efficiency. For example, the aerial UE 400 can avoid performing signal strength measurements on (multiple) beams that are not intended for the aerial UE 400, and / or the aerial UE 400 can select (multiple) intended beams with higher priority or lower RSRP thresholds than (multiple) beams that are not intended for the aerial UE 400. Alternatively or additionally, the aerial UE 400 can suppress RSRP measurements on SSBs that are determined not to be configured using the UAV-specific SSB configuration. The base station 200 can also schedule Msg2, Msg4, or MsgA during the RACH process using the expected better angle beam for the aerial UE 400.

[0047] UAV specific SSB configuration

[0048] The aerial UE 400 may utilize a UAV-specific SSB configuration. The UAV-specific SSB configuration may be used for the aerial UE 400 to select an SSB to be transmitted in a cell during a RACH process. The UAV-specific SSB configuration may be implemented using various techniques. In one technique, an SSB subset bitmap may be used, wherein each bit of the bitmap may represent an SSB transmitted in a cell. The value of the bit may indicate whether the corresponding SSB is included in the UAV-specific SSB configuration. Alternatively or additionally, in a second technique, a list of SSB indexes may be provided. Each value in the list may indicate that the corresponding SSB is included in the configuration. Alternatively or additionally, in a third technique, the SSB is positioned in a burst configuration to configure a set of SSBs to be included in the UAV-specific SSB configuration.

[0049] As previously described, the SSB RSRP threshold may also be included in the UAV-specific SSB configuration and may be used to select an SSB for RACH resource selection. The SSB RSRP threshold may be a separate configuration from the SSB RSRP threshold defined in the conventional NR specification for other purposes. The value of the SSB RSRP threshold may have a value different from the value of the SSB RSRP threshold defined in the conventional NR specification. The SSB RSRP threshold may be a value of a signal strength measurement result on the SSB, such as RSRP power in dBm. Applicable conditions for applying the UAV-specific SSB configuration

[0050] The UAV-specific SSB configuration may be applied by UE 400 and / or applicable in the context of the following conditions: (1) the altitude of the airborne UE 400 is above a predetermined altitude threshold; (2) the altitude of the airborne UE 400 exceeds a first predetermined altitude threshold and remains below a second predetermined altitude threshold; (3) the distance to a base station 200 (e.g., an eNB) is greater than a predetermined distance threshold; (4) the distance to the base station 200 is greater than the first predetermined distance threshold and less than the second predetermined distance threshold; and / or (5) the device is of an airborne UE 400 type.

[0051] Configuration of UAV-specific SSB configuration and / or applicable conditions

[0052] The UAV-specific SSB configuration and / or (multiple) associated application conditions can be configured in a variety of ways. In one example, the SI sent by the base station 200 may include a UAV-specific SSB configuration, for example, in the information element (IE) RACH-ConfigCommon or RACH-ConfigCommonTwoStepRA in the system information block 1 (SIBI), which can be used for RACH initiation, RRC establishment, RRC recovery, and RRC reconstruction. In another example, the UAV-specific SSB configuration can be configured in an RRC message for an airborne UE 400 in RRC_CONNECTED mode (in an RRC reconfiguration message and / or an RRC recovery message); and / or can be used for switching, beam failure recovery, SCell addition, PSCell change, and / or SCG addition.

[0053] Method for selecting RACH resources based on UAV-specific SSB configuration

[0054] The airborne UE 400 may only consider SSBs that are configured to use the UAV-specific configuration for RACH resource selection.

[0055] In a first example method, the airborne UE 400 may select an SSB only from among the SSBs configured to use the UAV-specific SSB configuration.

[0056] In a first example method, if at least one SSB configured in the UAV-specific SSB configuration having an RSRP exceeding a predetermined threshold is available, the aerial UE 400 may select an SSB configured in the UAV-specific SSB configuration having an RSRP above the predetermined threshold. Otherwise, if there is no SSB that meets the above criteria, the aerial UE 400 may select any SSB configured in the UAV-specific configuration.

[0057] Using this example method, the predetermined threshold may be a threshold defined in a conventional NR specification and applicable to other UEs / non-air UEs, or the predetermined threshold may be a threshold configured to use a UAV-specific SSB configuration. The SSB configured to use a UAV-specific SSB configuration may be an SSB transmitted for an airborne UE 400.

[0058] In a second example method, the aerial UE 400 may consider an SSB configured using a UAV-specific SSB configuration to have a higher priority.

[0059] In a second example method, if at least one SSB configured to use a UAV-specific SSB configuration having an RSRP exceeding a predetermined threshold is available, the airborne UE 400 may select the SSB. If there is no SSB that meets the above criteria, but at least one SSB is not configured to use a UAV-specific SSB configuration and the SSB has an RSRP exceeding a predetermined threshold, the airborne UE 400 may select the SSB. If there is no SSB that meets any of the above criteria, the airborne UE 400 may select any SSB.

[0060] In this second example method, the predetermined threshold may be defined by a conventional NR specification and applicable to other non-airborne UEs 300, or the predetermined threshold may be configured using a UAV-specific SSB configuration. Using the second example method, the SSB configured using a UAV-specific SSB configuration may be an SSB transmitted for an airborne UE 400.

[0061] In a third example method, the airborne UE 400 may consider SSBs configured to use a UAV-specific SSB configuration with different predetermined thresholds. Specifically, SSBs configured to use a UAV-specific SSB configuration and SSBs not configured to use a UAV-specific SSB configuration may be selected based on different RSRP thresholds.

[0062] In a third example method, if at least one first SSB configured to use a UAV-specific SSB configuration having an RSRP exceeding an "A" threshold is available, or if at least one second SSB not configured to use a UAV-specific SSB configuration having an RSRP exceeding a "B" threshold is available, the first SSB or the second SSB is selected. Otherwise, if there is no SSB that meets either of the above criteria, the airborne UE 400 may select any SSB.

[0063] The "A" threshold and the "B" threshold may have different values. The "A" threshold, or the "B" threshold, or both the "A" threshold and the "B" threshold may be configured to use a UAV-specific SSB configuration. If the "A" threshold or the "B" threshold is not configured to use a UAV-specific SSB configuration, it may be configured using methods and IEs in the conventional specification.

[0064] In a fourth example method, the aerial UE 400 may perform SSB selection using a predetermined threshold configured in a UAV-specific SSB configuration. Specifically, only a UAV-specific SSB RSRP threshold may be configured in a UAV-specific SSB configuration. When the associated application condition is satisfied, the aerial UE 400 may perform SSB selection based on the UAV-specific SSB RSRP threshold. The aerial UE 400 may not perform SSB selection based on any (multiple) SSB RSRP thresholds configured for other situations.

[0065] In a fifth example method, the airborne UE 400 may exclude SSBs configured to use the UAV-specific SSB configuration for RACH resource selection. The SSBs configured to use the UAV-specific SSB configuration may be transmitted to the terrestrial UE 300.

[0066] In a sixth example method, the aerial UE 400 may consider an SSB configured using a UAV-specific SSB configuration to have a lower priority.

[0067] In the sixth example method, if at least one SSB configured using the UAV-specific SSB configuration having an RSRP exceeding a predetermined threshold is available, the airborne UE 400 may select the SSB. If there is no SSB that meets the above criteria, but at least one SSB configured using the UAV-specific SSB configuration having an RSRP exceeding a predetermined threshold is available, the airborne UE 400 may select the SSB. If there is no SSB that meets any of the above criteria, the airborne UE 400 may select any SSB.

[0068] In this sixth example method, the SSB configured using the UAV-specific SSB configuration may be an SSB transmitted for the terrestrial UE 300 .

[0069] In all examples of this method, UAV-specific SSB configurations may be exchanged between the CU and DU of the base station 200.

[0070] By means of the UAV-specific SSB configuration, reference signals (RSs) transmitted to an airborne UE 400 flying above a certain altitude are indicated to the airborne UE 400. When the airborne UE 400 initiates a RACH procedure, the airborne UE 400 can select a RACH resource by considering these RSs with a higher priority or only these RSs. Alternatively, RSs transmitted to the terrestrial UE 300 are indicated to the airborne UE 400. When the airborne UE 400 initiates a RACH procedure, the airborne UE 400 can consider these RSs with a lower priority or not consider these RSs. Using these methods, the airborne UE 400 can have a higher probability of selecting an RS that is a better or best choice for the airborne UE 400.

[0071] Therefore, reference Figure 5, the base station 200 may configure one or more UAV-specific SSB configurations in S501, wherein each configuration is associated with one or more applicable conditions. The UAV-specific configuration may be sent to the UE 300 / 400 in S1 or using other techniques in S502, as described above. In S503, when (multiple) applicable conditions are met, the UE 300 / 400 may select the SSB configured in the UAV-specific configuration. In S504, the UE 300 / 400 may select a RACH resource based on the selected SSB configured in the UAV-specific configuration. Then, in S505, the UE 300 / 400 may send a RACH preamble on the selected RACH resource.

[0072] UAV-specific RACH resources

[0073] The base station 200 may configure UAV-specific RACH resources. The UAV-specific RACH resources may be RACH time slots (opportunities) or preambles of RACH time slots. The UAV-specific RACH resources may be configured in the initial uplink bandwidth part (BWP) of the serving cell, or in a separate initial uplink BWP configured for the UAV, or in a dedicated uplink BWP.

[0074] Together with the UAV-specific RACH resources, the base station 200 may configure applicable conditions, including one or more of the following: (1) whether the altitude of the airborne UE 400 exceeds a predetermined threshold; (2) whether the altitude of the airborne UE 400 exceeds a first predetermined threshold and is less than a second predetermined threshold; (3) whether the distance to the base station 200 exceeds a predetermined threshold; (4) whether the distance to the base station 200 exceeds a first predetermined threshold and is less than a second predetermined threshold; and / or (5) whether the device has a specific device type; for example, an airborne UE device type. The base station 200 may configure the above-mentioned predetermined thresholds. When the applicable condition(s) are met, the airborne UE 400 may apply the UAV-specific RACH resources.

[0075] The base station 200 may configure the UAV-specific RACH resources by indicating the IEfeatureCombinationPreambles in the IE RACH-ConfigCommon. The featureCombinationPreambles may include the IE FeatureCombination that may indicate a new feature. The new feature may be one or more of the following features: an airborne UE 400, or a UE 300 above a height threshold.

[0076] The separate initial uplink BWP may contain a cell-defined SSB (CD-SSB) or a non-cell-defined SSB (NCD-SSB). If the separate initial uplink BWP contains an NCD-SSB, the airborne UE 400 may perform RACH resource selection based on measurements of the NCD-SSB. Using this technique, these NCD-SSBs may be sent to serve airborne UEs 400 above a predetermined altitude. The airborne UE 400 may select a UAV-specific RACH resource based on the configured applicable conditions and perform RACH by applying the configured UAV-specific RACH resource.

[0077] The UAV-specific RACH configuration may be exchanged between the CU and DU of the base station 200 .

[0078] Using this method, when the configured applicable conditions are met, the airborne UE 400 can apply dedicated RACH resources. Therefore, the base station 200 can identify whether the airborne UE 400 is flying above a predetermined altitude or within the range of the altitude. The base station 200 can then schedule the airborne UE 400 using an appropriate beam. For example, the base station 200 schedules Msg2, Msg4, or MsgB using a downlink beam during the RACH process, and the downlink beam can be sent at a predetermined altitude.

[0079] UAV-specific measurement configuration

[0080] The base station 200 can configure a measurement configuration for the airborne UE 400. The measurement configuration can be applied under applicable conditions associated with the measurement configuration. The measurement configuration can be implemented by one or more of the following: (1) a measurement object IE that specifies information applicable to SSB intra-frequency / inter-frequency measurements and / or CSI-RS intra-frequency / inter-frequency measurements; for example, MeasObjectNR IE; (2) a bitmap that is used to indicate one or more SSBs on which measurements are to be performed; for example, ssb-ToMeasure IE; (3) SSB measurement timing configuration (SMTC); (4) a threshold for merging L1 measurements for each RS index; for example, absThreshSS-BlocksConsolidation IE; and / or (5) the number of SS blocks used for averaging cell measurement derivations, for example, nrofSS-BlocksToAverage IE. The measurement configuration can be a separate configuration in addition to the corresponding configuration in the conventional NR specification.

[0081] The applicable condition(s) may include one or more of the following: (1) whether the height of the airborne UE 400 exceeds a predetermined threshold; (2) whether the height of the airborne UE 400 exceeds a first predetermined threshold and is less than a second predetermined threshold; (3) whether the distance to the base station 200 exceeds a predetermined threshold; (4) whether the distance to the base station 200 exceeds a first predetermined threshold and is less than a second predetermined threshold; (5) whether the device has a specific device type; for example, an airborne UE device type; and / or (6) whether the airborne UE 400 is instructed to apply a measurement configuration; the indication of applying the measurement configuration may be an RRC message, an IE in an RRC message, an IE in an SIB or MACCE, or a DCI. The base station 200 may configure the predetermined threshold.

[0082] The measurement configuration may be applied to any of the following scenarios. In the first scenario, the measurement configuration may be applied to an airborne UE 400 in RRC CONNECTED mode to perform RRM measurements on a serving cell and / or a neighboring cell. In the second scenario, the measurement configuration may be applied to an airborne UE 400 in RRC IDLE mode and RRC INACTIVE mode to perform idle measurements. The configuration of idle measurements may be configured by an SI or an RRC release message, which releases the airborne UE 400 from RRC CONNECTED mode to RRC IDLE mode or RRC INACTIVE mode. The airborne UE 400 may save idle measurement results in RRC IDLE mode and RRC INACTIVE mode, and report the measurement results after transitioning to RRC CONNECTED mode. In the third scenario, the measurement configuration may be applied to an airborne UE 400 in RRC IDLE mode and RRC INACTIVE mode to perform measurements for cell selection or cell reselection. In this case, the measurement configuration may be included in the SI.

[0083] For an airborne UE 400 in RRC CONNECTED mode, or for an airborne UE 400 in RRC IDLE mode and RRC INACTIVE mode for performing IDLE measurements, measurement reporting may be performed as follows: (1) measurement results may be reported in a separate measurement result IE; for example, IE MeasResults; and (2) measurement results according to the separate measurement result IE may be reported together with measurement results according to a conventional measurement configuration.

[0084] For example, a new IE may be added to MeasObjectNR in an RRC message, or MeasIdleConfigSIB in SI, or MeasIdleConfigDedicated in an RRC message, or InterFreqCarrierFreqInfo in SI, or cellReselectionInfoCommon in SI to configure the measurement configuration. The newly added IE may include one or more of the following: (1) new SSB-ToMeasure; (2) new absThreshSS-BlocksConsolidation or absThreshCSI-RS-Consolidation; (3) new nrofSS-BlocksToAverage; (4) new SMTC; or a new IE indicating applicable conditions; for example, a height threshold.

[0085] UAV-specific reference signal information can be exchanged between base stations 200, or between CU and DU. The exchanged information may include one or more of the following: (1) information of UAV-specific SSB or CSI-RS; (2) SMTC associated with UAV-specific SSB or CSI-RS; or (3) applicable conditions. The information can be exchanged between base stations 200 to support neighboring cell measurements in one or more of the following scenarios: (1) between neighboring radio access networks (RANs) (i.e., gNBs) during interface establishment or modification procedures. The information can be exchanged on a per-cell basis. The information can be exchanged during the Xn establishment process and / or the NG-RAN mode configuration update process. The information can be exchanged between the CU and DU in one or more of the following scenarios: (1) between a centralized unit (CU) and a distributed unit (DU) of the base station 200; specifically, the information can be exchanged during the F1 establishment process and / or the GNB-DU configuration update process.

[0086] The UAV-specific measurement configuration may allow the base station 200 to configure a separate measurement configuration and (multiple) associated applicable conditions for the airborne UE 400. When (multiple) associated applicable conditions are met, the separate measurement configuration may be applied. The airborne UE 400 may automatically apply the UAV-specific measurement configuration; for example, in the case of idle measurements and RRM measurements in RRC IDLE mode and RRC INACTIVE mode. Alternatively, the airborne UE 400 may apply the UAV-specific measurement configuration based on an indication from the base station 200.

[0087] Thus, the base station 200 may configure different measurement configurations for the airborne UE 400 when flying above a predetermined altitude threshold or when flying within an altitude range. The base station 200 may configure a separate set of reference signals to perform measurements on; e.g., SSBs or CSI-RSs sent to the airborne UE 400 when in the air. The airborne UE 400 may then save power by avoiding performing measurements on the SSBs or CSI-RSs intended for the terrestrial UE 300.

[0088] The base station 200 may configure a separate number of SSBs or CSI-RSs to derive cell quality. The separate number of SSBs or CSI-RSs may be less than the number configured for a terrestrial UE 300 or an aerial UE 400 flying above the altitude threshold. This separate number may be better suited to the SSBs or CSI-RSs expected for an aerial UE 400 flying above the altitude threshold. Power for an aerial UE 400 may be saved by not considering the SSBs or CSI-RSs expected for a terrestrial UE 300.

[0089] By applying different measurement configurations at different altitudes, the measurement results can better reflect the radio quality of the cell.

[0090] The present subject matter describes methods, apparatus, and computer-readable media for wireless communications. The present subject matter solves the problem of scheduling multiple transmissions using one or more cells by reducing the number of bits required to indicate scheduled transmissions. The methods, apparatus, and computer-readable media described in the present subject matter can improve the performance of wireless transmissions between user equipment and base station 200, thereby improving efficiency and overall performance. The methods, apparatus, and computer-readable media described in the present subject matter can improve the overall efficiency of a wireless communication system.

[0091] The above description and accompanying drawings provide specific example embodiments and implementations. However, the described subject matter may be embodied in a variety of different forms, and therefore, the subject matter covered or claimed is intended to be interpreted as not being limited to any example embodiment set forth herein. It is intended to provide a reasonably broad scope for the subject matter claimed or covered. Among other things, for example, the subject matter may be embodied as a method, device, component, system, or non-transitory computer-readable medium for storing computer code. Therefore, the embodiment may, for example, take the form of hardware, software, firmware, storage media, or any combination thereof. For example, the above method embodiment may be implemented by a component, device, or system including a memory and a processor by executing a computer code stored in the memory.

[0092] Throughout the specification and claims, terms may have nuanced meanings expressed or implied in the context rather than the explicitly stated meanings. Likewise, the phrase "in one embodiment / implementation" used herein does not necessarily refer to the same embodiment, and the phrase "in another embodiment / implementation" used herein does not necessarily refer to a different embodiment. For example, the claimed subject matter includes, in whole or in part, a combination of the example embodiments.

[0093] In general, terms can be understood at least in part from usage in context. For example, terms such as "and", "or", or "and / or" used in this article can include multiple meanings, which can depend at least in part on the context in which such terms are used. Generally, "or" if used in an association list, such as A, B, or C, means A, B, and C, which are used here to include meanings; and A, B, or C, which are only used here to exclude meanings. In addition, the term "one or more" used in this article can be used to describe any feature, structure, or characteristic in a singular sense, or can be used to describe a combination of features, structures, or characteristics in a plural sense, which depends at least in part on the context. Similarly, terms such as "one", "an", or "the" can be understood to convey singular or plural usage, which depends at least in part on the context. In addition, the term "based on" can be understood to not necessarily be intended to convey a set of exclusive factors, but rather to allow the presence of other factors that are not necessarily explicitly described, which, again, depends at least in part on the context.

[0094] References to features, advantages, or similar language throughout the specification do not imply that all features and advantages that may be achieved with the present solution should or are included in any single implementation thereof. Rather, language referring to features and advantages is understood to mean that a particular feature, advantage, or characteristic described in connection with an embodiment is included in at least one embodiment of the present solution. Thus, discussion of features and advantages and similar language throughout the specification may, but does not necessarily, refer to the same embodiment.

[0095] Furthermore, the features, advantages, and characteristics of the present solution may be combined in any suitable manner in one or more embodiments. Based on the description herein, one of ordinary skill in the relevant art will recognize that the present solution may be practiced without one or more of the specific features or advantages of a particular embodiment. In other cases, additional features and advantages may be recognized in certain embodiments that may not be present in all embodiments of the present solution.

[0096] The subject matter of the present disclosure may also relate to or include the following aspects:

[0097] A first aspect includes a method for wireless communication performed by a user equipment (UE), comprising: receiving a specific configuration and associated applicable conditions from a base station, wherein the specific configuration includes: a synchronization signal block (SSB) subset of a plurality of SSBs; and / or an SSB RSRP threshold; if the associated applicable conditions are met, selecting an SSB based on the specific configuration; selecting a RACH resource based on the selected SSB; and sending a RACH preamble on the selected RACH resource.

[0098] A second aspect includes a method for wireless communication performed by a base station, comprising: sending a specific configuration and associated applicable conditions to an airborne UE, wherein the specific configuration includes: an SSB subset of a plurality of SSBs; and / or an SSB RSRP threshold.

[0099] A third aspect includes a method according to aspect 1 or 2, wherein the SSB subset of the plurality of SSBs is indicated by a bitmap, wherein each bit of the bitmap represents an SSB transmitted in a cell.

[0100] The fourth aspect includes the method according to aspect 2, further comprising: receiving a RACH preamble code from an aerial UE on a selected RACH resource; identifying a downlink beam selected by the aerial UE based on the RACH resource selected by the aerial UE; and using the identified downlink beam to schedule a downlink message.

[0101] The fifth aspect includes a method according to any one of aspects 2 to 4, further comprising: exchanging the specific configuration and the associated applicable conditions between a centralized unit (CU) and a distributed unit (DU) of the base station; or exchanging the specific configuration and the applicable conditions between the base station and another base station.

[0102] A sixth aspect includes a method according to any one of aspects 2 to 5, wherein the SSB subset indicates whether each of the multiple SSBs is configured for random access channel (RACH) resource selection when the associated applicability condition is met.

[0103] A seventh aspect includes a method according to any one of aspects 2 to 6, wherein the SSB subset indicates whether each of the multiple SSBs is configured for random access channel (RACH) resource selection when the associated applicability condition is met.

[0104] An eighth aspect includes a method according to any one of aspects 2 to 7, wherein the exchange of the specific configuration and the associated applicable conditions occurs on a per-cell basis during an interface establishment or modification process.

[0105] A ninth aspect includes a method according to any one of aspects 2 to 8, wherein the exchange of the specific configuration and the associated applicable conditions occurs during an Xn establishment procedure and / or an NG-RAN mode configuration update procedure.

[0106] The tenth aspect includes a method according to any one of aspects 2 to 9, and further includes: the exchange of the specific configuration and the associated applicable conditions occurs between the centralized unit (CU) and the distributed unit (DU) of the base station during the F1 establishment process and / or the GNB-DU configuration update process.

[0107] An eleventh aspect includes a method according to any one of aspects 2 to 10, wherein the identified downlink beam is transmitted to the airborne UE at a different angle than a downlink beam configured to be transmitted to a terrestrial UE.

[0108] A twelfth aspect includes the method according to aspect 1, wherein the SSB configured to use the specific configuration for RACH resource selection is transmitted from a base station in a beam configured to be received by an airborne UE.

[0109] A thirteenth aspect includes a method according to any one of aspects 1 and 11 to 12, wherein the applicable condition is that the height of the UE exceeds a predetermined threshold.

[0110] A fourteenth aspect includes a method according to any one of aspects 1 and 11 to 13, wherein the applicable condition is that the height of the UE exceeds a first predetermined threshold and remains below a second predetermined threshold.

[0111] A fifteenth aspect includes a method according to any one of aspects 1 and 11 to 14, wherein the applicable condition is that the distance from the UE to the base station exceeds a predetermined threshold.

[0112] A sixteenth aspect includes a method according to any one of aspects 1 and 11 to 15, wherein the applicable condition is that the distance from the UE to the base station exceeds a first predetermined threshold and remains below a second predetermined threshold.

[0113] A seventeenth aspect includes a method according to any one of aspects 1 and 11 to 16, wherein the applicable condition is that the UE is an airborne UE type.

[0114] An eighteenth aspect includes a method according to any one of aspects 1 and 11 to 17, wherein the selection of the SSB is based on: determining that a reference signal received power (RSRP) value of the selected SSB exceeds a predetermined threshold.

[0115] A nineteenth aspect includes a method according to any one of aspects 1 and 11 to 18, wherein the selection of the SSB is based on: determining that the selected SSB has a higher priority compared to another SSB having an RSRP exceeding a predetermined threshold.

[0116] A twentieth aspect includes a method according to any one of aspects 1 and 11 to 19, wherein the selection of the SSB is based on: determining that the selected SSB configured for use with a UAV-specific has a higher priority than another SSB having an RSRP exceeding a predetermined threshold.

[0117] A twenty-first aspect includes a method according to any one of aspects 1 and 11 to 20, wherein the selected SSB is configured to use the specific configuration for RACH resource selection.

[0118] The twenty-second aspect includes a method according to any one of aspects 1 and 11 to 21, wherein the selected SSB is not configured to use the specific configuration for RACH resource selection, and the selected SSB has an RSRP exceeding a predetermined threshold.

[0119] A twenty-third aspect includes a method according to any one of aspects 1 and 11 to 22, wherein the selected SSB is configured to use the specific configuration for RACH resource selection, and the selected SSB has an RSRP exceeding a predetermined threshold.

[0120] The twenty-fourth aspect includes a method according to any one of aspects 1 and 11 to 23, wherein the step of selecting an SSB from the multiple SSBs further includes: determining that no SSB is configured to use the specific configuration for RACH resource selection, determining that there is no SSB with an RSRP exceeding a predetermined threshold that is configured to utilize the specific configuration for RACH resource selection, and the selected SSB is any SSB among the SSBs transmitted in the cell.

[0121] Aspect twenty-fifth includes a method according to any one of aspects 1 and 11 to 24, further comprising: determining that there is a subset of one or more SSBs among the multiple SSBs that are not configured to use the specific configuration for RACH resource selection, and avoiding performing signal strength measurement on any SSB among the SSBs within the subset.

[0122] A twenty-sixth aspect includes a method according to any one of aspects 1 and 11 to 25, further comprising: receiving a reference signal (RS) in response to the UE flying above a predetermined threshold altitude.

[0123] A twenty-seventh aspect includes the method according to any one of aspects 1 and 11 to 26, further comprising: measuring the signal strength of the RS.

[0124] A twenty-eighth aspect includes a method according to any one of aspects 1 and 11 to 27, wherein the selection of the RACH resource is also based on: a measured signal strength of the RS.

[0125] A twenty-ninth aspect includes a method for wireless communication performed by a user equipment (UE), comprising: receiving a measurement configuration and an associated applicable condition; and applying the measurement configuration when the associated applicable condition is met.

[0126] A thirtieth aspect includes a method according to aspect 29, wherein the measurement configuration is implemented by a bitmap, the bitmap indicating one or more SSBs on which measurements are to be performed.

[0127] Aspect thirty-first includes a method according to aspect 29 or 30, wherein the measurement configuration is implemented by SSB measurement timing configuration (SMTC).

[0128] A thirty-second aspect includes a method according to any one of aspects 29 to 31, wherein the measurement configuration is implemented by a predetermined threshold, and the predetermined advance is used for combining L1 measurements per RS ​​index.

[0129] A thirty-third aspect includes a method according to any one of aspects 29 to 32, wherein the measurement configuration is implemented by multiple SS blocks, and the multiple SS blocks are used to average the cell measurement derivation.

[0130] A thirty-fourth aspect includes a method according to any one of aspects 29 to 33, wherein the measurement configuration is applied in RRC CONNECTED mode to perform measurements on serving and / or neighboring cells.

[0131] A thirty-fifth aspect includes a method according to any one of aspects 29 to 34, wherein the measurement configuration is applied in RRC IDLE mode and RRC INACTIVE mode to perform idle measurements.

[0132] Aspect 36 includes a method according to any one of aspects 29 to 35, wherein the idle measurement is configured by system information received from a base station or by an RRC release message, and the RRC release message releases the UE from the RRC CONNECTED mode to the RRC IDLE mode or RRC INACTIVE mode.

[0133] A thirty-seventh aspect includes a method according to any one of aspects 29 to 36, wherein the measurement configuration is configured by system information received from a base station and is applied in RRC IDLE mode and RRC INACTIVE mode to perform measurements for cell selection or reselection.

[0134] Aspect 38 includes a method according to any one of Aspects 29 to 37, wherein the associated applicable conditions include one or more of the following items: whether the height of the UE exceeds a first predetermined threshold; whether the height of the UE exceeds a second predetermined threshold and is less than a third predetermined threshold; whether the distance to the base station exceeds a fourth predetermined threshold; whether the distance to the base station exceeds a fifth predetermined threshold and is less than a sixth predetermined threshold; whether the UE is a specific device type; or whether the UE is instructed to apply the measurement configuration.

[0135] A thirty-ninth aspect includes a method according to any one of aspects 29 to 38, wherein the indication to apply the measurement configuration is an RRC message, an IE in an RRC message, an IE in a SIB, an IE in a MAC CE, or a DCI.

[0136] A fortieth aspect includes a method according to any one of aspects 29 to 39, wherein a base station configures one or more of the first predetermined threshold, the second predetermined threshold, the third predetermined threshold, the fourth predetermined threshold, the fifth predetermined threshold or the sixth predetermined threshold.

[0137] The forty-first aspect includes a method for wireless communication performed by a base station, comprising: configuring specific RACH resources and associated applicable conditions, wherein the RACH resources are RACH opportunities or RACH preambles; and the specific RACH resources are configured in one or more of the following items: a first initial uplink BWP of a serving cell; a second initial uplink BWP configured for a UE; or a dedicated uplink BWP.

[0138] Aspect 42 includes a method according to aspect 41, wherein the associated applicable conditions include one or more of the following items: whether the height of the UE exceeds a first predetermined threshold; whether the height of the UE exceeds a second predetermined threshold and is less than a third predetermined threshold; whether the distance to the base station exceeds a fourth predetermined threshold; whether the distance to the base station exceeds a fifth predetermined threshold and is less than a sixth predetermined threshold; or whether the UE is a specific device type.

[0139] Aspect 43 includes the method according to aspect 41 or 42, and further includes: configuring one or more of the first predetermined threshold, the second predetermined threshold, the third predetermined threshold, the fourth predetermined threshold, the fifth predetermined threshold or the sixth predetermined threshold.

[0140] A forty-fourth aspect includes a method according to any one of aspects 41 to 43, wherein the step of configuring the specific RACH resources further comprises: indicating IE featureCombinationPreambles in IE RACH-ConfigCommon.

[0141] Aspect 45 includes a method according to any one of aspects 41 to 44, wherein the IEfeatureCombinationPreambles are associated with one or more of the following features: an airborne UE, or a UE exceeding a height threshold.

[0142] A forty-sixth aspect includes a method according to any one of aspects 41 to 45, wherein the second initial uplink BWP configured for the UE comprises: a cell-defined SSB (CD-SSB) or a non-cell-defined SSB (NCD-SSB).

[0143] Aspect 47 includes a method according to any one of aspects 41 to 46, further comprising: sending the NCD-SSB to the UE when the UE exceeds a predetermined threshold altitude.

[0144] A forty-eighth aspect includes a device for wireless communication, comprising: a processor; and a memory communicating with the processor, the memory storing a plurality of instructions, the plurality of instructions being executable by the processor so that the device implements a method according to any one of the preceding aspects.

[0145] A forty-ninth aspect includes a non-transitory computer-readable medium comprising instructions, wherein the plurality of instructions, when executed by one or more processors, are operable to: implement a method according to any one of aspects 1 to 47.

Claims

1. A method for wireless communication performed by a user equipment (UE), include: receiving a specific configuration and associated applicable conditions from a base station, wherein The specific configuration includes: a synchronization signal block (SSB) subset of a plurality of SSBs; and / or SSB reference signal received power (RSRP) threshold; If the associated applicable condition is satisfied, selecting the SSB based on the specific configuration; selecting a RACH resource based on the selected SSB; and A RACH preamble is sent on the selected RACH resource.

2. A method for wireless communication performed by a base station, include: Send specific configuration and associated applicable conditions to the UE in the air, where The specific configuration includes: an SSB subset of a plurality of SSBs; and / or SSB RSRP threshold.

3. The method according to claim 1 or 2, wherein The SSB subset of the plurality of SSBs is indicated by a bitmap, wherein each bit of the bitmap represents an SSB transmitted in a cell.

4. The method according to claim 2, further comprising: include: receiving a RACH preamble on a selected RACH resource from the airborne UE; identifying a downlink beam selected by the aerial UE based on the RACH resource selected by the aerial UE; as well as A downlink message is scheduled using the identified downlink beam.

5. The method according to claim 2, further comprising: include: exchanging the specific configuration and the associated applicable condition between a centralized unit (CU) and a distributed unit (DU) of the base station; or The specific configuration and the applicable condition are exchanged between the base station and another base station.

6. The method according to claim 1, in: The SSB subset indicates whether each of the multiple SSBs is configured for random access channel (RACH) resource selection when the associated applicability condition is met.

7. The method according to claim 2, in: The SSB subset indicates whether each of the multiple SSBs is configured for random access channel (RACH) resource selection when the associated applicability condition is met.

8. The method according to claim 5, wherein The exchange of the specific configuration and the associated applicability conditions occurs on a per-cell basis during an interface establishment or modification process.

9. The method according to claim 5, wherein The exchange of the specific configuration and the associated applicable conditions occurs during the Xn establishment procedure and / or the NG-RAN mode configuration update procedure.

10. The method according to claim 5, further comprising: include: The exchange of the specific configuration and the associated applicable conditions occurs between a centralized unit (CU) and a distributed unit (DU) of the base station during an F1 establishment procedure and / or a GNB-DU configuration update procedure.

11. The method according to claim 4, wherein The identified downlink beam is transmitted to the airborne UE at a different angle than a downlink beam configured to transmit to a terrestrial UE.

12. The method according to claim 6, wherein An SSB among the plurality of SSBs configured to use the specific configuration for RACH resource selection is transmitted from the base station in a beam configured to be received by an over-the-air UE.

13. The method according to claim 1, wherein The associated applicable condition is that the height of the UE exceeds a predetermined threshold.

14. The method according to claim 1, wherein The associated applicable condition is that the height of the UE exceeds a first predetermined threshold and remains below a second predetermined threshold.

15. The method according to claim 1, wherein The associated applicable condition is that the distance between the UE and the base station exceeds a predetermined threshold.

16. The method according to claim 1, wherein The associated applicable condition is that the distance between the UE and the base station exceeds a first predetermined threshold and remains below a second predetermined threshold.

17. The method according to claim 1, wherein The associated applicable condition is whether the UE is an airborne UE type.

18. The method according to claim 1, wherein The selection of the SSB is based on determining that a reference signal received power (RSRP) of the selected SSB exceeds a predetermined threshold.

19. The method according to claim 1, wherein The selection of the SSB is based on determining that the selected SSB has a higher priority than another SSB having an RSRP exceeding a predetermined threshold.

20. The method of claim 1, wherein The selection of the SSB is based on determining that the selected SSB configured to use the particular configuration has a higher priority than another SSB having an RSRP exceeding a predetermined threshold.

21. The method according to claim 1, wherein The selected SSB is configured to use the specific configuration for RACH resource selection.

22. The method of claim 1, wherein The selected SSB is not configured to use the specific configuration for RACH resource selection, and The selected SSB has an RSRP exceeding a predetermined threshold.

23. The method of claim 1, wherein The selected SSB is configured to use the specific configuration for RACH resource selection, and The selected SSB has an RSRP exceeding a predetermined threshold.

24. The method of claim 1, wherein the step of selecting an SSB from the plurality of SSBs further comprises: include: determining that no SSB is configured to use the specific configuration for RACH resource selection, determining that there is no SSB configured to utilize the particular configuration for RACH resource selection having an RSRP exceeding a predetermined threshold, and The selected SSB is any SSB among the SSBs transmitted in the cell.

25. The method according to claim 1, further comprising: include: determining that there is a subset of one or more SSBs of the plurality of SSBs that are not configured to use the particular configuration for RACH resource selection, and Avoid performing signal strength measurements on any of the SSBs within the subset of the one or more SSBs.

26. The method according to claim 1, further comprising: include: In response to the UE exceeding a predetermined threshold altitude, a reference signal (RS) is received.

27. The method according to claim 26, further comprising: include: The signal strength of the RS is measured.

28. The method of claim 27, wherein The selection of the RACH resource is also based on: a measured signal strength of the RS.

29. A method for wireless communication performed by a user equipment (UE), include: receiving a measurement configuration and associated applicable conditions; as well as When the associated applicable condition is met, the measurement configuration is applied.

30. The method of claim 29, wherein The measurement configuration is implemented by a bitmap indicating one or more SSBs on which measurements are to be performed.

31. The method of claim 29, wherein The measurement configuration is implemented through SSB Measurement Timing Configuration (SMTC).

32. The method of claim 29, wherein The measurement configuration is implemented by a predetermined threshold value, which is used for combining L1 measurements per RS ​​index.

33. The method of claim 29, wherein The measurement configuration is implemented by a plurality of SS blocks, and the plurality of SS blocks are used to average cell measurement derivations.

34. The method of claim 29, wherein The measurement configuration is applied in RRC CONNECTED mode to perform measurements on serving and / or neighboring cells.

35. The method of claim 34, wherein The measurement configuration is applied in RRC IDLE mode and RRC INACTIVE mode to perform idle measurement.

36. The method of claim 35, wherein The idle measurement is configured by system information received from a base station or by an RRC release message, and the RRC release message releases the UE from the RRC CONNECTED mode to the RRC IDLE mode or the RRC INACTIVE mode.

37. The method of claim 29, wherein The measurement configuration is configured by system information received from the base station and is applied in RRC IDLE mode and RRC INACTIVE to perform measurement for cell selection or reselection.

38. The method of claim 29, wherein The associated applicable conditions include one or more of the following: Whether the height of the UE exceeds a first predetermined threshold; Whether the height of the UE exceeds a second predetermined threshold and is less than a third predetermined threshold; whether the distance to the base station exceeds a fourth predetermined threshold; whether the distance to the base station exceeds a fifth predetermined threshold and is less than a sixth predetermined threshold; Whether the UE is a specific device type; or Whether the UE is instructed to apply the measurement configuration.

39. The method of claim 38, wherein The indication for applying the measurement configuration is an RRC message, an IE in an RRC message, an IE in an SIB, an IE in a MAC CE, or a DCI.

40. The method of claim 38, wherein The base station configures one or more of the first predetermined threshold, the second predetermined threshold, the third predetermined threshold, the fourth predetermined threshold, the fifth predetermined threshold or the sixth predetermined threshold.

41. A method for wireless communication performed by a base station, include: Configure specific RACH resources and associated applicable conditions, where The RACH resource is a RACH opportunity or a RACH preamble; and The specific RACH resource is configured in one or more of the following items: The first initial uplink BWP of the serving cell; a second initial uplink BWP configured for the UE; or Dedicated uplink BWP.

42. The method of claim 41, wherein the associated applicable conditions include one or more of the following: Whether the height of the UE exceeds a first predetermined threshold; Whether the height of the UE exceeds a second predetermined threshold and is less than a third predetermined threshold; whether the distance to the base station exceeds a fourth predetermined threshold; whether the distance to the base station exceeds a fifth predetermined threshold and is less than a sixth predetermined threshold; or Whether the UE is a specific device type.

43. The method according to claim 42, further comprising: include: Configure one or more of the first predetermined threshold, the second predetermined threshold, the third predetermined threshold, the fourth predetermined threshold, the fifth predetermined threshold, or the sixth predetermined threshold.

44. The method according to claim 41, wherein the step of configuring the specific RACH resource further comprises: include: Indicate IE featureCombinationPreambles in IE RACH-ConfigCommon.

45. The method of claim 44, wherein The IE featureCombinationPreambles are associated with one or more of the following features: Airborne UE, or UEs exceeding the height threshold.

46. ​​The method of claim 41, wherein The second initial uplink BWP configured for the UE include: Cell defined SSB (CD-SSB) or non-cell defined SSB (NCD-SSB).

47. The method according to claim 46, further comprising: include: When the UE exceeds a predetermined threshold altitude, the NCD-SSB is sent to the UE.

48. A device for wireless communication, include: processor; as well as a memory in communication with the processor, the memory storing a plurality of instructions executable by the processor to cause the apparatus to: Implement the method according to claim 1 or 2.

49. A non-transitory computer readable medium comprising instructions that, when executed by one or more processors, are operable to: Implement the method according to claim 1 or 2.

50. A device for wireless communication, include: processor; as well as a memory in communication with the processor, the memory storing a plurality of instructions executable by the processor to cause the apparatus to: Implement the method according to claim 29 or 41.

51. A non-transitory computer readable medium comprising instructions that, when executed by one or more processors, are operable to: Implement the method according to claim 29 or 41.

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