Scheduling time offsets for non-terrestrial networks

Abstract

A method for a user equipment (UE) includes receiving at least one time offset for scheduling non-terrestrial communications. The at least one first time offset is configured based on a parameter set and / or a bandwidth part (BWP). The UE communicates based on the time offset. The time offset may be a single time offset that applies to all parameter sets, or may be multiple time offsets, each specific to a particular parameter set or bandwidth part (BWP). The time offset may be a single time offset scaled based on a current parameter set configured for communication. The time offset may be applied to different bandwidth parts (BWPs) or to multiple component carriers from which the UE is receiving downlink data.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to U.S. patent application No. 17 / 336,107, filed on June 1, 2021, entitled “SCHEDULING TIME OFFSET FOR NON-TERRESTRIAL NETWORKS,” which claims the benefit of U.S. Provisional Patent Application No. 63 / 038,704, filed on June 12, 2020, entitled “SCHEDULING TIME OFFSET FOR NON-TERRESTRIAL NETWORKS,” the disclosures of which are expressly incorporated by reference in their entirety. Technical Field

[0003] Aspects of the present disclosure relate generally to wireless communications, and more particularly to techniques and apparatus for 5G New Radio (NR) scheduling time offsets for non-terrestrial networks. Background Art

[0004] Wireless communication systems are widely deployed to provide a variety of telecommunication services, such as telephony, video, data, messaging, and broadcasting. Typical wireless communication systems may employ multiple access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of these multiple access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and long term evolution (LTE). LTE / LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP).

[0005] A wireless communication network may include multiple base stations (BSs) that can support communication for multiple user equipment (UEs). User equipment (UEs) can communicate with a base station (BS) via downlinks and uplinks. The downlink (or forward link) refers to the communication link from the BS to the UE, and the uplink (or reverse link) refers to the communication link from the UE to the BS. As described in more detail, a BS may be referred to as a Node B, gNB, access point (AP), radio head, transmit receive point (TRP), new radio (NR) BS, 5G Node B, etc.

[0006] The above multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different user devices to communicate at a municipal, national, regional, or even global level. New Radio (NR), which may also be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP). NR is designed to better support mobile broadband Internet access by improving spectrum efficiency, reducing costs, improving services, utilizing new spectrum, and better integrating with other open standards that use orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) (CP-OFDM) on the downlink (DL), CP-OFDM and / or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), and support beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation. Summary of the Invention

[0007] According to aspects of the present disclosure, a method for wireless communication by a user equipment (UE) includes receiving at least one first time offset for scheduling non-terrestrial communications. The at least one first time offset is configured based on at least one of a parameter set or a bandwidth part (BWP). The method also includes communicating based on the at least one first time offset.

[0008] In other aspects, an apparatus for wireless communication at a sidelink user equipment (UE) includes a processor and a memory coupled to the processor. Instructions stored in the memory, when executed by the processor, cause the apparatus to receive at least one first time offset for scheduling non-terrestrial communications. The at least one first time offset is configured according to at least one of a parameter set or a bandwidth part (BWP). The instructions further cause the apparatus to communicate according to the at least one first time offset.

[0009] According to aspects of the present disclosure, a user equipment (UE) for wireless communication includes means for receiving at least one first time offset for scheduling non-terrestrial communications. The at least one first time offset is configured according to at least one of a parameter set or a bandwidth part (BWP). The UE also includes means for communicating according to the at least one first time offset.

[0010] In other aspects, a non-transitory computer-readable medium records program code. The program code is executed by a user equipment (UE) and includes program code for receiving at least one first time offset for scheduling non-terrestrial communications. The at least one first time offset is configured according to at least one of a parameter set or a bandwidth part (BWP). The program code also includes program code for communicating according to the at least one first time offset.

[0011] Aspects generally include methods, apparatus, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices, and processing systems as substantially described with reference to and as illustrated by the accompanying drawings and description.

[0012] The foregoing has outlined rather broadly the features and technical advantages of examples according to the present disclosure so that the following detailed description may be better understood. Additional features and advantages will be described. The disclosed concepts and specific examples may be readily used as a basis for users to modify or design other structures that perform the same purposes of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The features of the disclosed concepts, their organization and method of operation, and associated advantages will be better understood from the following description when considered in conjunction with the accompanying drawings. Each of the figures is provided for illustration and description purposes only and not as a definition of limitations to the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Thus, the features of the present disclosure may be understood in detail and may be specifically described with reference to various aspects, some of which are illustrated in the accompanying drawings. However, it should be noted that the accompanying drawings illustrate only certain aspects of the present disclosure and are not therefore to be considered limiting of its scope, as the description may admit of other equally effective aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0014] Figure 1 is a block diagram conceptually illustrating an example of a wireless communication network in accordance with various aspects of the present disclosure.

[0015] Figure 2 is a block diagram conceptually illustrating an example of a base station communicating with a user equipment (UE) in a wireless communication network according to various aspects of the present disclosure.

[0016] Figure 3 An example of a wireless communication system supporting timing offsets for scheduling non-terrestrial networks according to aspects of the present disclosure is shown.

[0017] Figure 4 An example of another wireless communication system supporting timing offsets for scheduling non-terrestrial networks according to aspects of the present disclosure is shown.

[0018] Figure 5 is a diagram illustrating example procedures performed by a user equipment (UE), eg, communicating with a scheduled time offset, in accordance with various aspects of the present disclosure. DETAILED DESCRIPTION

[0019] Various aspects of the present disclosure are described more fully below with reference to the accompanying drawings. However, the present disclosure can be implemented in many different forms and should not be interpreted as being limited to any specific structure or function presented throughout the present disclosure. On the contrary, these aspects are provided to make the present disclosure detailed and complete, and will fully convey the scope of the present disclosure to those skilled in the art. Based on the teachings, those skilled in the art should understand that the scope of the present disclosure is intended to cover any aspect of the present disclosure, whether implemented independently of any other aspect of the present disclosure or combined with any other aspect of the present disclosure. For example, any number of aspects described can be used to implement an apparatus or practice method. In addition, the scope of the present disclosure is intended to cover such an apparatus or method that is practiced using other structures, functions, or structures and functions in addition to or different from the various aspects of the disclosure described. It should be understood that any aspect of the disclosed disclosure can be embodied by one or more elements of the claims.

[0020] Several aspects of telecommunications systems will now be presented with reference to various devices and techniques. These devices and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements can be implemented using hardware, software, or a combination thereof. Whether these elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0021] It should be noted that although various aspects may be described using terminology generally associated with 5G and beyond wireless technologies, aspects of the present disclosure may be applicable to communication systems based on other generations, such as and including 3G and / or 4G technologies.

[0022] In non-terrestrial networks (NTNs), the round-trip time from a base station to a UE via an intermediate satellite can be quite long. Similarly, the round-trip time between a base station on a satellite and a UE can be significant. This long round-trip time is due to the large distances that electromagnetic waves must traverse. 5G New Radio systems use an additional time offset to compensate for this round-trip time delay, ensuring efficient scheduling of transmissions with uplink-downlink (UL-DL) interactions.

[0023] According to aspects of the present disclosure, additional time offsets may be signaled and determined across different parameter sets in possibly different bandwidth parts (BWPs), component carriers, etc. In some aspects of the present disclosure, a parameter set agnostic timing offset value (K) is provided. offset ). That is, the timing offset value specifies the same number of time slots for each parameter set. The parameter set refers to at least the subcarrier spacing, for example, 15kHz, 30kHz, etc.

[0024] In other aspects, the network signals a default timing offset value for a baseline parameter set. The timing offset value for any particular parameter set is then determined by applying a scaling factor to the scaling factor of the baseline parameter set. According to other aspects of the present disclosure, the network signals different timing offset values to apply to different parameter sets or different bandwidth parts (BWPs). According to further aspects of the present disclosure, the different timing offset options are applied to different bandwidth parts or to different component carriers (CCs) in a carrier aggregation configuration.

[0025] Figure 1 is a diagram illustrating a network 100 in which aspects of the present disclosure may be practiced. The network 100 may be a 5G or NR network or some other wireless network, such as an LTE network. The wireless network 100 may include multiple BSs 110 (illustrated as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities. A BS is an entity that communicates with a user equipment (UE) and may also be referred to as a base station, NR BS, Node B, gNB, 5G Node B (NB), access point, transmit receive point (TRP), etc. Each BS may provide communication coverage for a specific geographic area. In 3GPP, the term "cell" may refer to the coverage area of a BS and / or a BS subsystem serving that coverage area, depending on the context in which the term is used.

[0026] A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and / or another type of cell. A macro cell may cover a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access by UEs with a service subscription. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with a service subscription. A femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG)). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS. In Figure 1 In the example shown, BS 110a may be a macro BS for macrocell 102a, BS 110b may be a pico BS for picocell 102b, and BS 110c may be a femto BS 102c for a femtocell. A BS may support one or more (e.g., three) cells. The terms "eNB," "base station," "NRBS," "gNB," "TRP," "AP," "Node B," "5G NB," and "cell" may be used interchangeably.

[0027] In some aspects, the cells may not necessarily be fixed, and the geographic area of the cells may move depending on the location of the mobile BS. In some aspects, the BSs may be interconnected to each other and / or to one or more other BSs or network nodes (not shown) in the wireless network 100 via various types of backhaul interfaces, such as direct physical connections, virtual networks, and / or the like using any suitable transport network.

[0028] The wireless network 100 may also include a relay station. A relay station is an entity that can receive data transmissions from an upstream station (e.g., a BS or a UE) and send data transmissions to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that can relay transmissions for other UEs. Figure 1 In the example shown, a relay station 110d may communicate with a macro BS 110a and a UE 120d to facilitate communication between the BS 110a and the UE 120d. A relay station may also be referred to as a relay BS, a relay base station, a relay, etc.

[0029] The wireless network 100 may be a heterogeneous network including different types of BSs, such as macro BSs, pico BSs, femto BSs, relay BSs, etc. These different types of BSs may have different transmit power levels, different coverage areas, and different impacts on interference in the wireless network 100. For example, a macro BS may have a high transmit power level (e.g., 5 watts to 40 watts), while a pico BS, a femto BS, and a relay BS may have a lower transmit power level (e.g., 0.1 watt to 2 watts).

[0030] A network controller 130 may be coupled to a set of BSs and may provide coordination and control for these BSs. The network controller 130 may communicate with the BSs via a backhaul. The BSs may also communicate with each other (eg, directly or indirectly via a wireless backhaul or a wired backhaul).

[0031] UEs 120 (e.g., 120a, 120b, 120c) may be dispersed throughout the wireless network 100, and each UE may be stationary or mobile. A UE may also be referred to as an access terminal, terminal, mobile station, subscriber unit, station, etc. A UE may be a cellular phone (e.g., a smartphone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet computer, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, a biometric sensor / device, a wearable device (e.g., a smart watch, smart clothing, smart glasses, a smart wristband, smart jewelry (e.g., a smart ring, a smart bracelet)), an entertainment device (e.g., a music or video device or a satellite radio), a vehicle component or sensor, a smart meter / sensor, an industrial manufacturing device, a global positioning system device, or any other suitable device configured to communicate via a wireless medium or a wired medium.

[0032] Some UEs may be considered to be machine type communication (MTC) or evolved or enhanced machine type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., which may communicate with a base station, another device (e.g., a remote device), or some other entity. A wireless node may provide, for example, a connection to a network or to a network (e.g., a wide area network such as the Internet or a cellular network) via a wired communication link or a wireless communication link. Some UEs may be considered to be Internet of Things (IoT) devices and / or may be implemented as NB-IoT (narrowband Internet of Things) devices. Some UEs may be considered to be customer premises equipment (CPE). UE 120 may be included inside a housing that houses components of UE 120 (such as a processor component, a memory component, etc.).

[0033] In general, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a specific RAT and can operate on one or more frequencies. RATs can also be referred to as radio technologies, air interfaces, etc. Frequencies can also be referred to as carriers, frequency channels, etc. Each frequency can support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks can be deployed.

[0034] In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly using one or more sidelink channels (e.g., without using base station 110 as an intermediary for communicating with each other). For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, etc.), mesh networks, etc. In such cases, UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere as being performed by base station 110. For example, base station 110 may configure UE 120 via downlink control information (DCI), radio resource control (RRC) signaling, medium access control-control element (MAC-CE), or via system information (e.g., system information blocks (SIBs)).

[0035] UE 120 may include a non-terrestrial network (NTN) timing offset module 140. For simplicity, only one UE 120d is shown as including NTN timing offset module 140. NTN timing offset module 140 may receive one or more first time offsets for scheduling non-terrestrial communications. The one or more first time offsets may be configured based on at least one of a parameter set or a bandwidth part (BWP). NTN timing offset module 140 may also communicate based on the one or more first time offsets.

[0036] As pointed out above, Figure 1 are provided as examples only. Other examples may be Figure 1 Different than described.

[0037] Figure 2 A block diagram shows a design 200 of a base station 110 and a UE 120, which may be Figure 1 Base station 110 may be equipped with T antennas 234a through 234t, and UE 120 may be equipped with R antennas 252a through 252r, where in general T≧1 and R≧1.

[0038] At the base station 110, the transmit processor 220 may receive data for one or more UEs from a data source 212, select one or more modulation and coding schemes (MCS) for each UE based at least in part on a channel quality indicator (CQI) received from the UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS selected for the UE, and provide data symbols for all UEs. Lowering the MCS may reduce throughput but improve transmission reliability. The transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI) and control information (e.g., CQI requests, grants, upper layer signaling, etc.) and provide overhead symbols and control symbols. The transmit processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS)) and synchronization signals (e.g., primary synchronization signal (PSS) and secondary synchronization signal (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on data symbols, control symbols, overhead symbols, and / or reference symbols (if applicable), and may provide T output symbol streams to T modulators (MODs) 232a through 232t. Each modulator 232 may process a corresponding output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. T downlink signals from modulators 232a through 232t may be transmitted via T antennas 234a through 234t, respectively. In accordance with various aspects described in greater detail below, position coding may be utilized to generate synchronization signals to convey additional information.

[0039] At UE 120, antennas 252a through 252r may receive downlink signals from base station 110 and / or other base stations and may provide received signals to demodulators (DEMODs) 254a through 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) the received signal to obtain input samples. Each demodulator 254 may also process the input samples (e.g., for OFDM, etc.) to obtain received symbols. A MIMO detector 256 may obtain received symbols from all R demodulators 254a through 254r, perform MIMO detection on the received symbols (if applicable), and provide detected symbols. A receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to a data sink 260, and provide decoded control information and system information to a controller / processor 280. The channel processor may determine reference signal received power (RSRP), received signal strength indicator (RSSI), reference signal received quality (RSRQ), channel quality indicator (CQI), etc. In some aspects, one or more components of UE 120 may be included in a housing.

[0040] On the uplink, at the UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information from a controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, CQI, etc.). The transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 (if applicable), further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and transmitted to the base station 110. At the base station 110, uplink signals from the UE 120 and other UEs may be received by the antennas 234, processed by the demodulators 254, detected by the MIMO detector 236 (if applicable), and further processed by the receive processor 238 to obtain decoded data and control information transmitted by the UE 120. The receive processor 238 may provide decoded data to a data sink 239 and decoded control information to the controller / processor 240. The base station 110 may include a communication unit 244 and communicate with the network controller 130 via the communication unit 244. The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292.

[0041] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2Any other components of the may perform one or more techniques associated with non-terrestrial network time offsets, as described in more detail elsewhere herein. For example, the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other component of may execute or direct (for example) Figure 5 Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively. Scheduler 246 may schedule UEs for data transmission on the downlink and / or uplink.

[0042] In some aspects, the UE 120 may include means for receiving, means for communicating, means for scaling, means for deriving, and / or means for determining. Such means may include in conjunction with Figure 2 One or more components of UE 120 are described.

[0043] As pointed out above, Figure 2 are provided as examples only. Other examples may be Figure 2 Different than described.

[0044] In some cases, different types of devices supporting different types of applications and / or services can coexist in a cell. Examples of different types of devices include UE handsets, customer premises equipment (CPE), vehicles, Internet of Things (IoT) devices, etc. Examples of different types of applications include ultra-reliable low-latency communications (URLLC) applications, massive machine-type communications (mMTC) applications, enhanced mobile broadband (eMBB) applications, vehicle-to-everything (V2X) applications, etc. In addition, in some cases, a single device can support different applications or services simultaneously.

[0045] Figure 3 An example of a wireless communication system 300 that supports scheduling timing offsets for non-terrestrial networks (NTNs) according to aspects of the present disclosure is shown. In some examples, the wireless communication system 300 can implement aspects of the wireless communication system 100. The wireless communication system 300 can include a base station 110 and a UE 120, which can be reference Figure 1 Examples of corresponding devices described herein. For example, wireless communication system 300 may be a non-terrestrial network that may include base station 110, UE 120, and satellite 340. Satellite 340 may relay communications between base stations (e.g., base station 110) and mobile terminals (e.g., UE 120). Base station 110 may also be referred to as a gateway. The geographic area associated with the transmit beam of satellite 340 may be referred to as beam coverage area 330, and when UE 120 is within beam coverage area 330, UE 120 may communicate with satellite 340.

[0046] The base station 110 may perform communication procedures (e.g., radio resource control (RRC) procedures, such as a cell acquisition procedure, a random access procedure, an RRC connection procedure, an RRC configuration procedure) with the UE 120. The base station 110 may be configured with multiple antennas, which may be used for directional or beamforming transmissions. As part of the communication procedure, the base station 110 may establish a bidirectional communication link 310 to communicate with the UE 120. Additionally or alternatively, as part of the communication procedure, the base station 110 may configure the UE 120 with a configuration 315 (e.g., an indication of time and frequency resources, a reference signal period, a symbol of a time slot for transmitting a reference signal) via RRC signaling. Although in Figure 3 3. Although shown as direct communication in FIG, the present disclosure focuses on communication of UE 120 to base station 110 via satellite 340.

[0047] Satellite 340 may generate satellite information (e.g., ephemeris information) associated with communications between satellite 340, UE 120, and base station 110. For example, satellite 340 may determine a propagation delay associated with transmissions between satellite 340, UE 120, and base station 110. In some cases, the propagation delay may be based on a distance d from satellite 340 to point 305 (e.g., the center) of beam coverage area 330. In other cases, the propagation delay may be a factor of distance d, which may correspond to a round-trip distance between base station 110 and satellite 340. Additionally or alternatively, the propagation delay may be an estimated round-trip delay or round-trip time between UE 120 and base station 110, which may be based at least in part on distance d and / or 2d. It should be noted that distance d may not reflect the exact distance from satellite 340 to UE 120. For example, UE 120 may be located at the edge of beam coverage area 330 and may be at a distance from satellite 340 that is different than distance d. However, this distance difference may be negligible compared to the distance d. Therefore, the distance d may adequately represent the distance from the satellite 340 to the UE 120.

[0048] Satellite 340 may transmit satellite information to base station 110 and / or UE 120, which may be located within beam coverage area 330, via wireless communication link 335. In some cases, satellite 340 may update and transmit satellite information to base station 110 and / or UE 120 on a preconfigured schedule (e.g., an update rate). The preconfigured schedule may be based on the speed of satellite 340. For example, the speed of satellite 340 may result in a maximum round-trip time variation rate of 50 μs per second. That is, for each second of movement of satellite 340, the round-trip communication time between satellite 340 and UE 120 may vary by, for example, 50 μs. The round-trip time variation rate may also vary based on the movement of the satellite (e.g., orbit). In this case, satellite 340 may update satellite information multiple times per second. Additionally or alternatively, base station 110 may transmit satellite information to UE 120 via bidirectional communication link 310, for example, as part of configuration 315. In some cases, base station 110 may transmit satellite information to UE 120 based on a preconfigured schedule, such as the update rate of satellite 340.

[0049] The satellite information may also include the velocity of the satellite 340. In some cases, the velocity of the satellite 340 may be defined by or related to the following expression v×cos(α), where α is the angle between the vector of the velocity v and the vector of the distance d. The UE 120 may use the velocity of the satellite 340 to determine the round-trip time rate of change. In some cases, the UE 120 may use the velocity of the satellite 340 to determine the round-trip time rate of change based at least in part on the positioning of the UE 120 relative to the point 305 of the beam coverage area 330. In some examples, using the velocity of the satellite 340, the round-trip time rate of change may be defined by the following expression -2v×cos(α) / c, where α is the angle between the vector of the velocity v and the vector of the distance d, and c is the speed of light. Therefore, if the upstream transmission is scheduled to have a timing adjustment t a If the transmission is sent at time t0, the actual transmission time of UE 120 may be t a +t0. For a node scheduled to start at time t without a new timing adjustment provided by base station 110 a For subsequent upstream transmissions sent at +Δt, the actual transmission time of UE 120 may be t a +Δt×(-2v×cos(α) / c).

[0050] When UE 120 is in discontinuous reception (DRX) mode and in RRC idle or RRC connected, base station 110 may transmit downlink control information in specific time and frequency resources (e.g., fixed symbols). Between these time and frequency resources, UE 120 may enter a low-power state (also known as "sleep mode") to reduce power consumption and increase battery life of UE 120. In RRC idle or RRC connected, UE 120 may wake up once every multiple symbols to receive downstream transmissions from base station 110 and / or satellite 340. The gap periods allocated before and after reference signal transmissions may benefit base station 110 by reducing or eliminating interference between UE 120 transmissions and transmissions from another neighboring UE.

[0051] Figure 4 An alternative network configuration of a wireless communication system 400 according to aspects of the present disclosure is shown. In this configuration, a base station 110-b is located on a satellite 440. The base station 110-b communicates with a core network 430 via a wireless communication link 435. The UE 120 communicates with the non-terrestrial base station 110-b via the wireless communication link 435.

[0052] In a non-terrestrial network (NTN), the round-trip time from base station 110 to UE 120 via intermediate satellite 340 may be considerable. Similarly, the round-trip time between base station 110-b on satellite 440 and UE 120 may be considerable. The greater round-trip time is due to the greater distance that the electromagnetic waves must traverse.

[0053] The 5G New Radio system compensates for this round trip time delay by adding an additional time offset in order to ensure efficient scheduling of transmissions with uplink-downlink (UL-DL) interactions. These additional offsets (referred to as K in Section 6.2.1.2 of the 3GPP (3rd Generation Partnership Project) Technical Report 38.821) offset ) can be applied to timing relationships involving uplink-downlink interactions. The UE can derive K from the broadcast system information when acquiring a satellite cell. offset , or K offset It can be configured by higher layers, such as using Radio Resource Control (RRC) signaling. offset The value can be for each satellite beam or each cell. According to aspects of the present disclosure, K offset The values may be signaled and determined across different parameter sets in potentially different bandwidth parts (BWPs), component carriers, etc.

[0054] In 3GPP Technical Report 38.821, K offsetThe value is applied to the transmission timing of the physical uplink shared channel (PUSCH) scheduled by DCI (downlink control information) (including CSI (channel state information) on PUSCH), the transmission timing of the PUSCH scheduled by random access response (RAR) grant, the transmission timing of the hybrid automatic repeat request acknowledgement (HARQ-ACK) message on the physical uplink control channel (PUCCH), the medium access control-control element (MAC-CE) action timing, the CSI reference resource timing, and the transmission timing of the aperiodic sounding reference signal (SRS). In 3GPP Technical Report 38.821, K offset The value of is given as the number of time slots and is independent of any parameter set (eg, the subcarrier spacing (SCS) configured for communication). In practice, different parameter sets may be employed in different component carriers.

[0055] Since propagation delay is independent of the parameter set, using a parameter set-agnostic timing offset value may result in more delay than would be required for a parameter set with a small SCS (e.g., a large slot duration), thereby reducing throughput. For parameter sets with a large SCS (e.g., a small slot duration), this may result in an inefficient scheduling configuration because multiple slots may not be sufficient to account for propagation delay. Even between the 15 kHz and 60 kHz parameter sets, a parameter set-agnostic timing offset value quadruples the absolute time allocated for propagation delay from the 60 kHz parameter set to the 15 kHz parameter set.

[0056] According to aspects of the present disclosure, a parameter set agnostic timing offset value (K offset ). That is, the timing offset value specifies the same number of time slots for each parameter set. The network appropriately broadcasts or signals the timing offset value (K offset ), in other words, so that the parameter set with the largest possible subcarrier spacing can be scheduled. The timing offset value (K offset ) may reduce the throughput of numerology sets with smaller subcarrier spacing.

[0057] According to other aspects of the present disclosure, the network broadcasts or signals a default timing offset value for baseline parameter learning. The UE then determines the timing offset value for any particular parameter set by applying a scaling factor. For example, the default timing offset value may be used as Broadcast or signaled for parameter set μ default The specific timing offset value of parameter set μ (K offset ) was determined to be In some cases, f(.) may represent a rounding up or rounding down operation. The function f(.) may be defined in a specification or provided in broadcast or dedicated signaling. In some aspects, the function f(.) may be an identity function.

[0058] According to other aspects of the present disclosure, the network broadcasts or signals different timing offset values to apply to different parameter sets. This option potentially provides more granularity with respect to scaling at the expense of more signaling overhead. Thus, a first timing offset may be signaled for a first parameter set, and a second timing offset may be signaled for a second parameter set. Similarly, if there are more than two parameter sets, more than two timing offsets may be signaled.

[0059] According to other aspects of the present disclosure, the network broadcasts or signals different timing offset values for different bandwidth parts (BWPs). In these aspects, a first timing offset can be signaled for a first BWP, and a second timing offset can be scheduled for a second BWP. Similarly, if there are more than two BWPs, more than two timing offsets can be signaled.

[0060] According to aspects of the present disclosure, the different timing offset options described above are applied to different bandwidth parts. That is, the UE can assume, for example, based on common system information, that the solution applies to different bandwidth parts that may be part of the same beam or cell. In the case of parameter set-agnostic time offsets, the UE applies the time offset across all bandwidth parts with common system information (such as common system information block (SIB) messages). Similarly, for scaled / default time offsets or offsets specific to a particular parameter set, the UE applies the time offset across all bandwidth parts that share the system information.

[0061] The present disclosure contemplates multiple component carriers (CCs) in a carrier aggregation configuration. Each component carrier has its own system information. If multiple component carriers are configured, different time offset values may be received for each component carrier due to the different system information. That is, multiple time offset sets may be received. The UE may send uplink transmissions (e.g., sending HARQ-ACK feedback) corresponding to downlink receptions on multiple component carriers in a common uplink carrier (such as a primary component carrier in a time division duplex (TDD) operation mode). In this case, the timeline of the uplink transmissions should be uniquely determined relative to the common uplink carrier. In order to uniquely determine the timeline, a set of common time offset values may be determined based on multiple time offset sets corresponding to multiple downlink component carriers. An example where the above event may occur is a cross-carrier scheduling scenario where a primary component carrier schedules downlink transmissions on multiple (primary and secondary) component carriers, where HARQ feedback is jointly provided on the primary component carrier.

[0062] In aspects of the present disclosure, the UE may determine a common offset for the aforementioned timeline based on an offset corresponding to the primary component carrier. For example, the offset may be communicated to the UE as broadcast system information, dedicated RRC signaling, or the like. In other aspects, the UE may determine the common offset as the maximum offset among the allocated time offsets for multiple component carriers. This determination may be per parameter set or per individual offset value, depending on how the offset is signaled. Any of these aspects may operate in conjunction with the aforementioned time offsets, i.e., parameter set-agnostic time offsets, scaled time offsets, BWP-specific time offsets, and parameter set-specific time offsets.

[0063] As pointed out above, Figures 3 and 4 are provided as examples. Other examples may differ from those regarding Figures 3 and 4 described.

[0064] Figure 5 5 is a diagram illustrating an example process 500, for example, performed by a UE, according to various aspects of the present disclosure. The example process 500 is an example of scheduling a time offset for a non-terrestrial network. Figure 5 As shown, in some aspects, process 500 may include receiving at least one first time offset for scheduling non-terrestrial communications. The first time offset is configured based on a parameter set and / or bandwidth part (BWP) (block 502). For example, a user equipment (e.g., using antenna 252a, DEMOD / MOD 254a, MIMO detector 256, receive processor 258, controller / processor 280, and / or memory 282) receives the first time offset. The first time offset may be a single time offset that applies to all parameter sets. In other aspects, the first time offset is a single time offset, and the UE scales the single time offset based on the current parameter set configured for communication to derive the scaled time offset. The UE may derive the scaled time offset by applying a round-up operation and / or a round-down operation. The first time offset may include a first offset specific to a first parameter set and / or BWP, and a second offset specific to a second parameter set and / or BWP. The first time offset may include at least one time offset associated with each component carrier from which the UE is receiving downlink data.

[0065] Process 500 may include communicating according to at least one first time offset (block 504). For example, the user equipment (e.g., using antenna 252r, DEMOD / MOD 254r, MIMO detector 256, receive processor 258, TX MIMO processor 266, transmit processor 264, controller / processor 280, and / or memory 282) communicates according to at least one first time offset. In the case of scaled offsets, the UE may communicate according to scaled time offsets rather than a single time offset. In other aspects, the UE may communicate on different bandwidth parts (BWPs) corresponding to common system information according to the first time offset. The UE may determine the timing of uplink transmissions on the uplink component carrier based on the time offset associated with the primary downlink component carrier or based on the maximum time offset across all aggregated downlink component carriers.

[0066] Examples of implementations are described in the following numbered clauses.

[0067] 1. A method for wireless communication by a user equipment (UE), comprising:

[0068] receiving at least one first time offset for scheduling non-terrestrial communications, wherein the at least one first time offset is configured according to at least one of a parameter set or a bandwidth part (BWP); and

[0069] Communicating is performed according to at least one first time offset.

[0070] 2. The method of clause 1, wherein the at least one first time offset is a single time offset applied to all parameter sets.

[0071] 3. A method according to clause 1 or 2, wherein the at least one first time offset comprises a single time offset, and the method further comprises:

[0072] scaling the time offset based on a current set of parameters configured for communication to derive a scaled time offset; and

[0073] By applying the scaled time offset, communicating is performed according to at least one first time offset.

[0074] 4. The method of any preceding clause, further comprising deriving the scaled time offset by applying at least one of a rounding-up operation or a rounding-down operation.

[0075] 5. The method of clause 1, wherein the at least one first time offset comprises a first time offset specific to the first parameter set and a second time offset specific to the second parameter set.

[0076] 6. The method according to any of the preceding clauses 1 or 5, wherein the at least one first time offset comprises a first time offset specific to a first bandwidth part (BWP) and a second time offset specific to a second BWP.

[0077] 7. A method according to any of the preceding clauses 1, 5 or 6, wherein communicating according to at least one first time offset comprises communicating on a plurality of different bandwidth parts (BWPs) corresponding to common system information according to at least one first time offset.

[0078] 8. A method as described in any of the preceding clauses 1, 5, 6 or 7, wherein the at least one first time offset comprises at least one time offset associated with each component carrier from which the UE is receiving downlink data.

[0079] 9. A method as described in any preceding clause 1, 5, 6, 7 or 8, further comprising determining the timing of uplink transmissions on the uplink component carrier based on at least one time offset associated with the primary downlink component carrier.

[0080] 10. A method as described in any preceding clause 1, 5, 6, 7, 8 or 9, further comprising determining the timing of uplink transmissions on the uplink component carrier based on a maximum time offset across all aggregated downlink component carriers.

[0081] 11. A method according to any of the preceding clauses 1, 5, 6, 7, 8, 9 or 10, wherein the maximum time offset comprises a maximum time offset for each parameter set.

[0082] 12. A method according to any of the preceding clauses 1, 5, 6, 7, 8, 9, 10 or 11, wherein the at least one first time offset associated with each component carrier comprises at least one of a scaled time offset, a parameter set agnostic time offset, a bandwidth part specific time offset or a parameter set specific time offset.

[0083] 13. An apparatus for wireless communication at a user equipment (UE), comprising:

[0084] processor;

[0085] a memory coupled to the processor; and

[0086] stored in the memory and operable to cause the apparatus, when executed by the processor, to:

[0087] receiving at least one first time offset for scheduling non-terrestrial communications, wherein the at least one first time offset is configured according to at least one of a parameter set or a bandwidth part (BWP); and

[0088] Communicating is performed according to at least one first time offset.

[0089] 14. The apparatus of clause 13, wherein the at least one first time offset is a single time offset applied to all parameter sets.

[0090] 15. An apparatus according to clause 13 or 14, wherein the at least one first time offset comprises a single time offset, and wherein the processor further causes the apparatus to:

[0091] scaling the single time offset based on a current set of parameters configured for communication to derive a scaled time offset; and

[0092] By applying the scaled time offset, communicating is performed according to at least one first time offset.

[0093] 16. The apparatus of any of clauses 13 to 15, wherein the processor causes the apparatus to derive the scaled time offset by applying at least one of a rounding-up operation or a rounding-down operation.

[0094] 17. The apparatus of clause 13, wherein the at least one first time offset comprises a first time offset specific to the first parameter set and a second time offset specific to the second parameter set.

[0095] 18. Apparatus according to any of clauses 13 or 17, wherein the at least one first time offset comprises a first time offset specific to a first bandwidth part (BWP) and a second time offset specific to a second BWP.

[0096] 19. An apparatus as described in any of clauses 13, 17 or 18, wherein the processor causes the apparatus to communicate over a plurality of different bandwidth parts (BWPs) corresponding to common system information according to at least one first time offset.

[0097] 20. An apparatus as described in any of clauses 13 or 17 to 19, wherein the at least one first time offset comprises at least one time offset associated with each component carrier from which the UE is receiving downlink data.

[0098] 21. An apparatus as described in any of clauses 13 or 17 to 20, wherein the processor causes the apparatus to determine the timing of uplink transmissions on the uplink component carrier based on at least one time offset associated with a primary downlink component carrier.

[0099] 22. An apparatus as described in any of clauses 13 or 17 to 21, wherein the processor causes the apparatus to determine the timing of uplink transmissions on the uplink component carrier based on a maximum time offset across all aggregated downlink component carriers.

[0100] 23. Apparatus according to any of clauses 13 or 17 to 22, wherein the maximum time offset comprises a maximum time offset per parameter set.

[0101] 24. An apparatus according to any one of clauses 13 or 17 to 23, wherein the at least one first time offset associated with each component carrier comprises at least one of a scaled time offset, a parameter set agnostic time offset, a bandwidth part specific time offset or a parameter set specific time offset.

[0102] 25. A user equipment (UE) for wireless communication, comprising:

[0103] means for receiving at least one first time offset for scheduling non-terrestrial communications, wherein the at least one first time offset is configured according to at least one of a parameter set or a bandwidth part (BWP); and

[0104] Means for communicating according to at least one first time offset.

[0105] 26. A UE as set out in clause 25, wherein the at least one first time offset is a single time offset applied to all parameter sets.

[0106] 27. A UE as set out in clause 25 or 26, wherein the at least one first time offset is a single time offset, and the UE further comprises:

[0107] means for scaling the single time offset based on a current set of parameters configured for communication to derive the scaled time offset; and means for communicating according to the at least one first time offset by applying the scaled time offset.

[0108] 28. The UE of clause 25, wherein the at least one first time offset comprises a first time offset specific to the first parameter set and a second time offset specific to the second parameter set.

[0109] 29. A UE as set out in any of clauses 25 or 28, wherein the at least one first time offset comprises a first time offset specific to a first bandwidth part (BWP) and a second time offset specific to a second BWP.

[0110] 30. A UE according to any of clauses 25, 28 or 29, wherein the means for communicating according to the at least one first time offset comprises means for communicating over a plurality of different bandwidth parts (BWPs) corresponding to common system information according to the at least one first time offset.

[0111] The above disclosure provides illustration and description, but is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations are possible in light of the above disclosure or may be acquired from practice of the aspects.

[0112] As used, the term "component" is intended to be broadly interpreted as hardware, software, and / or a combination of hardware and software. As used, a processor is implemented in hardware, firmware, and / or a combination of hardware and software.

[0113] Some aspects are described in conjunction with thresholds. As used, satisfying a threshold may refer to a value greater than a threshold, greater than or equal to a threshold, less than a threshold, less than or equal to a threshold, equal to a threshold, not equal to a threshold, etc., depending on the context.

[0114] It is apparent that the described systems and / or methods can be implemented in various forms of hardware, firmware, and / or combinations of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods is not intended to be limiting in any way. Thus, the operation and behavior of the systems and / or methods have been described without reference to specific software code. It should be understood that software and hardware can be designed to implement the systems and / or methods based, at least in part, on the description.

[0115] Although specific combinations of features are referenced in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of the various aspects. In fact, many of these features can be combined in ways that are not specifically referenced in the claims and / or disclosed in the specification. Although each dependent claim listed below may be directly subordinate to only one claim, the disclosure of the various aspects includes each dependent claim in combination with each other claim in the claim set. The phrase "at least one" in a list of reference items refers to any combination of those items, including single members. As an example, "at least one of a, b or c" is intended to cover a, b, c, ab, ac, bc and abc, as well as combinations with multiple identical elements (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc and ccc or any other order of a, b and c).

[0116] Unless explicitly stated otherwise, any element, behavior or instruction used should not be interpreted as critical or essential. In addition, as used, the articles "a" and "an" are intended to include one or more items and can be used interchangeably with "one or more". In addition, as used, the terms "set" and "group" are intended to include one or more items (e.g., related items, unrelated items, a combination of related items and unrelated items, etc.) and can be used interchangeably with "one or more". In the case of only one item, the phrase "only one" or similar language is used. In addition, as used, the terms "has", "have", "having" etc. are intended to be open terms. In addition, the phrase "based on" is intended to mean "based at least in part on", unless explicitly stated otherwise.

Claims

1. A method for wireless communication in a user equipment (UE), comprising: receiving a single NTN time offset via at least broadcast non-terrestrial network NTN system information; scaling the single NTN time offset according to at least one of a first parameter set or a bandwidth part (BWP) to generate a single scaled parameter set-specific NTN time offset by applying at least one of a rounding-up operation or a rounding-down operation, the first parameter set corresponding to a first subcarrier spacing (SCS); as well as Communicating in a non-terrestrial network and according to the single scaled parameter set specific NTN time offset, the single scaled parameter set specific NTN time offset being different from a second scaled parameter set specific NTN time offset associated with a second UE configured with a second parameter set different from the first parameter set.

2. The method according to claim 1, wherein The single NTN time offset is applied to all parameter sets including the first parameter set.

3. The method according to claim 1, wherein The single NTN time offset includes a first time offset specific to the first parameter set, and the method further includes receiving a second time offset specific to the second parameter set.

4. The method according to claim 1, wherein The single NTN time offset includes a first time offset specific to a first bandwidth part BWP, and the UE also receives a second time offset specific to a second BWP.

5. The method according to claim 1, wherein Communicating according to the single scaled parameter set specific NTN time offset includes communicating over a plurality of different bandwidth parts (BWPs) corresponding to common system information according to the single scaled parameter set specific NTN time offset.

6. The method according to claim 1, wherein The single NTN time offset also includes at least one NTN time offset associated with each component carrier from which the UE is receiving downlink data.

7. The method of claim 6, further comprising transmitting an uplink transmission on an uplink component carrier based on the single scaled parameter set-specific NTN time offset associated with a primary downlink component carrier.

8. The method of claim 6, further comprising transmitting uplink transmissions on uplink component carriers based on a maximum time offset across all aggregated downlink component carriers.

9. The method according to claim 8, wherein The maximum time offset includes the maximum time offset of each parameter set.

10. The method according to claim 6, wherein: The single NTN time offset associated with each component carrier comprises at least one of a single scaled time offset, a parameter set agnostic time offset, a bandwidth part specific time offset, or a parameter set specific time offset.

11. The method of claim 1 , further comprising receiving dedicated radio resource control (RRC) signaling for the single NTN time offset.

12. An apparatus for wireless communication, comprising: at least one processor; as well as at least one memory comprising instructions executable by the at least one processor to cause the apparatus to: receiving a single NTN time offset via at least broadcast non-terrestrial network NTN system information; scaling the single NTN time offset according to at least one of a first parameter set or a bandwidth part (BWP) to generate a single scaled parameter set-specific NTN time offset by applying at least one of a rounding-up operation or a rounding-down operation, the first parameter set corresponding to a first subcarrier spacing (SCS); as well as Communicating in a non-terrestrial network and according to the single scaled parameter set specific NTN time offset, the single scaled parameter set specific NTN time offset being different from a second scaled parameter set specific NTN time offset associated with a second user equipment (UE) configured with a second parameter set different from the first parameter set.

13. The device according to claim 12, wherein The single NTN time offset is applied to all parameter sets including the first parameter set.

14. The device according to claim 12, wherein The single NTN time offset comprises a first time offset specific to the first parameter set, and the at least one processor is further configured to receive a second time offset specific to the second parameter set.

15. The device according to claim 12, wherein The single NTN time offset includes a first time offset specific to a first bandwidth part BWP, and the at least one processor is further configured to receive a second time offset specific to a second BWP.

16. The device according to claim 12, wherein The at least one processor is configured to cause the apparatus to communicate over a plurality of different bandwidth parts (BWPs) corresponding to common system information according to the single scaled parameter set-specific NTN time offset.

17. The device according to claim 12, wherein The single NTN time offset also includes at least one NTN time offset associated with each component carrier from which the apparatus is receiving downlink data.

18. The apparatus of claim 17, further comprising a transceiver configured to transmit an uplink transmission on an uplink component carrier based on the single NTN time offset associated with a primary downlink component carrier, wherein the apparatus is configured as a user equipment (UE).

19. The apparatus of claim 17, further comprising a transceiver configured to transmit uplink transmissions on uplink component carriers based on a maximum time offset across all aggregated downlink component carriers, wherein the apparatus is configured as a user equipment (UE).

20. The device according to claim 19, wherein The maximum time offset includes the maximum time offset of each parameter set.

21. The apparatus according to claim 17, wherein The single NTN time offset associated with each component carrier comprises at least one of a single scaled time offset, a parameter set agnostic time offset, a bandwidth part specific time offset, or a parameter set specific time offset.

22. The apparatus of claim 12, wherein the at least one processor is further configured to cause the apparatus to receive dedicated radio resource control (RRC) signaling for the single NTN time offset.

23. A user equipment (UE), comprising: means for receiving a single NTN time offset via at least broadcasted non-terrestrial network (NTN) system information; means for scaling the single NTN time offset according to at least one of a first parameter set or a bandwidth part (BWP) to generate a single scaled parameter set-specific NTN time offset by applying at least one of a rounding-up operation or a rounding-down operation, the first parameter set corresponding to a first subcarrier spacing (SCS); as well as Means for communicating in a non-terrestrial network and in accordance with the single scaled parameter set specific NTN time offset, the single scaled parameter set specific NTN time offset being different from a second scaled parameter set specific NTN time offset associated with a second UE configured with a second parameter set different from the first parameter set.

24. The UE according to claim 23, wherein: The single NTN time offset is applied to all parameter sets including the first parameter set.

25. The UE according to claim 23, wherein: The single NTN time offset includes a first time offset specific to the first parameter set, and the UE also receives a second time offset specific to the second parameter set.

26. The UE according to claim 23, wherein: The single NTN time offset includes a first time offset specific to a first bandwidth part BWP, and the UE also receives a second time offset specific to a second BWP.

27. The UE according to claim 23, wherein: The means for communicating according to the single scaled parameter set specific NTN time offset comprises means for communicating according to the single scaled parameter set specific NTN time offset over a plurality of different bandwidth parts (BWP) corresponding to common system information.

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