Detection of high-speed train scenarios and indication of high-speed train (HST) mode

Abstract

A method for wireless communication by a base station detects that a UE is in a high-speed train scenario. When the UE is detected to be in a high-speed train scenario, the method also instructs the UE to enter a high-speed train (HST) mode. The method further performs beam management according to the HST mode. A UE (user equipment) for wireless communication detects when the UE is in a high-speed train scenario. The UE also reports the high-speed train scenario to a base station and subsequently receives an instruction from the base station to enter a high-speed train (HST) mode. The UE performs beam management according to the HST mode.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This patent application claims priority to U.S. patent application No. 17 / 148,476, filed on January 13, 2021, entitled “DETECTION OF HIGH SPEED TRAIN SCENARIO AND INDICATION OF HIGH SPEED TRAIN (HST) MODE,” and U.S. Provisional Patent Application No. 62 / 994,180, filed on March 24, 2020, entitled “DETECTION OF HIGH SPEED TRAIN SCENARIO AND INDICATION OF HIGH SPEED TRAIN (HST) MODE,” the disclosures of which are expressly incorporated herein by reference in their entirety.

[0003] Public domain

[0004] The present disclosure relates generally to wireless communications, and more particularly to detecting a high speed train (HST) scenario and indicating a high speed train (HST) mode.

[0005] background

[0006] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasting. Typical wireless communication systems may employ multiple access technologies that can support communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such 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).

[0007] A wireless communication network may include several base stations (BS) that can support communication of several user equipments (UEs). User equipments (UEs) may communicate with base stations (BSs) via downlinks and uplinks. Downlinks (or forward links) refer to the communication link from a BS to a UE, while uplinks (or reverse links) refer to the communication link from a UE to a BS. As will be described in more detail herein, 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, and the like.

[0008] The above multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different user equipment to communicate at city, country, region, and even global levels. New Radio (NR) (which may also be referred to as 5G) is an enhancement set to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP). NR is designed to better support mobile broadband Internet access by using orthogonal frequency division multiplexing (OFDM) (CP-OFDM) with cyclic prefix (CP) on the downlink (DL), using CP-OFDM and / or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), and supporting beamforming, multiple input multiple output (MIMO) antenna technology and carrier aggregation to improve spectrum efficiency, reduce costs, improve services, utilize new spectrum, and better integrate with other open standards.

[0009] Wireless communication should be able to cover scenarios where the UE is traveling on a high-speed train, such as a train moving at a speed of more than 300 km / h. For sub-6 GHz systems (e.g., LTE, NR FR1 (New Radio Frequency One), etc.), a single frequency network (SFN) approach is generally considered. For millimeter wave systems (e.g., NR FR2 (New Radio Frequency Two)), a more advanced approach is adopted due to the use of analog beamforming. In other words, the beam management for high-speed train scenarios is different from the beam management for ordinary UE scenarios. Other wireless communication technologies may also be different in high-speed scenarios.

[0010] Overview

[0011] In some aspects of the present disclosure, a method of wireless communication by a user equipment (UE) may receive an instruction from a base station to enter a high speed train (HST) mode. The method may also perform beam management according to the HST mode.

[0012] In some aspects of the present disclosure, a method for wireless communication by a base station may detect that a UE (user equipment) is in a high-speed train scenario. The method may also instruct the UE to enter a high-speed train (HST) mode when the UE is detected to be in a high-speed train scenario. The method may further perform beam management according to the HST mode.

[0013] In another aspect of the present disclosure, a device for wireless communication performed by a user equipment (UE) includes a processor and a memory coupled to the processor. The instructions stored in the memory can be used to cause the device to receive an instruction to enter a high-speed train (HST) mode from a base station when executed by the processor. The device can also perform beam management according to the HST mode. In another aspect of the present disclosure, a device for wireless communication performed by a base station includes a processor and a memory coupled to the processor. The instructions stored in the memory can be used to cause the device to detect that the UE (user equipment) is in a high-speed train scene when executed by the processor. The device can also instruct the UE to enter a high-speed train (HST) mode when the UE is detected to be in a high-speed train scene. The device can further perform beam management according to the HST mode.

[0014] The described technology relates to improved methods, systems, devices and apparatuses for supporting random access procedures for non-terrestrial networks. In general, the described technology provides a wireless communication system that can be a non-terrestrial network, which can include a base station (e.g., a gateway), a user equipment (UE), and a satellite that wirelessly communicates with the base station and the UE, etc. In some cases, the base station can be integrated or located on a satellite.

[0015] Some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for performing the following actions: generating a configuration for a UE, the configuration comprising a reference signal (RS) periodicity, an indication of code elements of a time slot, and an indication of frequency resources for uplink transmission; and transmitting the configuration to the UE during a connection procedure with the UE. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to understand the features of the present disclosure in detail, a more specific description may be made with reference to various aspects, some of which are illustrated in the accompanying drawings. However, it should be noted that the accompanying drawings only illustrate certain aspects of the present disclosure and should not be considered to limit its scope, as the description may allow for other equally effective aspects. The same reference numerals in different drawings may identify the same or similar elements. Figure 1 is a block diagram conceptually illustrating an example of a wireless communication network in accordance with various aspects of the present disclosure.

[0018] Figure 2is a block diagram conceptually illustrating an example of a base station and a user equipment (UE) in communication in a wireless communication network according to various aspects of the present disclosure.

[0019] Figure 3 is a diagram illustrating simulated beam management for a high-speed train scenario in accordance with aspects of the present disclosure.

[0020] Figure 4 is a diagram illustrating a fixed beam along a railway in accordance with aspects of the present disclosure.

[0021] Figure 5A and 5B is a diagram illustrating different beam patterns according to aspects of the present disclosure.

[0022] Figure 6 is a diagram illustrating example processes performed, for example, by a base station in accordance with various aspects of the present disclosure.

[0023] Figure 7 is a diagram illustrating example processes performed, for example, by a user equipment (UE) according to various aspects of the present disclosure.

[0024] Detailed Description

[0025] The 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 given throughout the present disclosure. On the contrary, these aspects are provided to make the present disclosure thorough and complete, and it will fully convey the scope of the present disclosure to those skilled in the art. Based on the teachings herein, those skilled in the art will appreciate that the scope of the present disclosure is intended to cover any aspect of the present disclosure described herein, whether it is implemented independently or in combination with any other aspect of the present disclosure. For example, any number of aspects described can be used to implement a device or practice method. In addition, the scope of the present disclosure is intended to cover such devices or methods that are practiced using supplements or other other structures, functionality, or structures and functionality as the various aspects of the present disclosure described. It should be understood that any aspect of the present disclosure disclosed can be implemented by one or more elements of the claims.

[0026] Several aspects of telecommunication 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 such elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0027] It should be noted that while various aspects may be described using terminology generally associated with 5G and later generation wireless technologies, various aspects of the present disclosure may be applied in communication systems based on other generations, such as and including 3G and / or 4G technologies.

[0028] As described above, wireless communication may occur in a scenario where a UE is traveling on a high-speed train, such as a train moving at a speed of more than 300 km / h. For sub-6 GHz systems (e.g., LTE, NR FR1 (New Radio Frequency Range One), etc.), a single frequency network (SFN) approach is generally considered. In the SFN approach, multiple transmit receive points (TRPs) transmit the same data on the same frequency and time resources without analog beamforming.

[0029] For mmWave systems (e.g., NR FR2 (New Radio Frequency Range Two)), a more advanced approach is adopted due to the use of analog beamforming. Beam management is specified for NR FR2. Beam management methods have been well developed for normal FR2 deployment scenarios. However, normal beam management methods for normal scenarios may not be applicable to high-speed train scenarios. For example, analog beam determination based on beam sweeping (e.g., current solutions) may not work due to the high speed of the UE. According to aspects of the present disclosure, when the UE is in a high-speed scenario, beam management methods and other techniques specific to high-speed scenarios may be triggered.

[0030] Figure 1 1 is a diagram illustrating a network 100 in which an indication of a high-speed train mode 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 several BSs 110 (shown as BSs 110a, BSs 110b, BSs 110c, and BSs 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, B node, gNB, 5G B node (NB), access point, transmission reception point (TRP), etc. Each BS may provide communication coverage for a particular geographic area. In 3GPP, the term "cell" may refer to a coverage area of ​​a BS and / or a BS subsystem serving the coverage area, depending on the context in which the term is used.

[0031] 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., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscriptions. A femto cell may cover a relatively small geographic area (e.g., a residence) 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 in , BS 110a may be a macro BS for macro cell 102a, BS 110b may be a pico BS for pico cell 102b, and BS 110c may be a femto BS for femto cell 102c. The BS may support one or more (e.g., three) cells. The terms "eNB", "base station", "NR BS", "gNB", "TRP", "AP", "Node B (NB)", "5GNB", and "cell" may be used interchangeably.

[0032] In some aspects, the cell may not necessarily be stationary, and the geographic area of ​​the cell 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, etc.) using any suitable transport network.

[0033] The wireless network 100 may also include a relay station. A relay station is an entity that can receive transmissions of data from an upstream station (e.g., a BS or a UE) and send transmissions of the data 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 in , 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, or the like.

[0034] The wireless network 100 may be a heterogeneous network including different types of BSs (e.g., 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 effects on interference in the wireless network 100. For example, a macro BS may have a high transmit power level (e.g., 5 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 to 2 watts).

[0035] A network controller 130 may be coupled to a set of BSs and may provide coordination and control of these BSs. The network controller 130 may communicate with each BS via a backhaul. The BSs may also communicate with each other directly or indirectly, for example, via a wireless or wired backhaul.

[0036] UEs 120 (e.g., 120a, 120b, 120c) may be dispersed throughout the wireless network 100, and each UE may be stationary or mobile. UEs may also be referred to as access terminals, terminals, mobile stations, subscriber units, stations, etc. A UE may be a cellular phone (e.g., a smart phone), 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, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, a biometric sensor / device, a wearable device (smart watch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, 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, industrial manufacturing equipment, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium.

[0037] Some UEs may be considered as machine type communication (MTC) UEs, 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 connectivity to or to a network (e.g., a wide area network (such as the Internet) or a cellular network), for example, via a wired or wireless communication link. Some UEs may be considered as Internet of Things (IoT) devices, and / or may be implemented as NB-IoT (narrowband Internet of Things) devices. Some UEs may be considered as client equipment (CPE). UE 120 may be included inside a housing that houses components of UE 120, such as a processor component, a memory component, and the like.

[0038] In general, any number of wireless networks may be deployed in a given geographic area. Each wireless network may support a specific RAT and may operate on one or more frequencies. RAT may also be referred to as radio technology, air interface, etc. Frequency may also be referred to as carrier, frequency channel, etc. Each frequency may 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 may be deployed.

[0039] In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly (e.g., without using base station 110 as an intermediary to communicate with each other) using one or more sidelink channels. 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 this case, UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by base station 110.

[0040] As indicated above, Figure 1 These are provided as examples only. Other examples may differ from those described herein. Figure 1 The content depicted.

[0041] Figure 2 A block diagram of a design 200 of a base station 110 and a UE 120 is shown, which may be Figure 1 One for each base station and one for each UE in the base station 110. 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.

[0042] At the base station 110, the transmit processor 220 may receive data for one or more UEs from the 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. The transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI), etc.) 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 signals (PSS) and secondary synchronization signals (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, where applicable, and may provide T output symbol streams to T modulators (MOD) 232a to 232t. Each modulator 232 may process a respective 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 up-convert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a to 232t may be transmitted via T antennas 234a to 234t, respectively. According to various aspects described in more detail below, position coding may be used to generate synchronization signals to convey additional information.

[0043] At UE 120, antennas 252a to 252r may receive downlink signals from base station 110 and / or other base stations and may provide received signals to demodulators (DEMODs) 254a to 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 further 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 to 254r, perform MIMO detection on the received symbols where 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.

[0044] 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 as well as other UEs may be received by the antenna 234, processed by the demodulator 254, detected by the MIMO detector 236, if applicable, and further processed by the receive processor 238 to obtain decoded data and control information sent by the UE 120. The receive processor 238 may provide decoded data to a data sink 239 and provide decoded control information to a 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.

[0045] 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 system may perform one or more techniques associated with the high-speed train mode, 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(s) may perform or direct e.g. Figure 6-7 The processes and / or operations of other processes as described herein. 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. In some aspects, UE 120 may include means for detecting, means for instructing, means for receiving, means for performing beam management, and means for reporting. Such means may include in conjunction with Figure 2 One or more components of a UE 120 or base station 110 are depicted.

[0046] As indicated above, Figure 2 These are provided as examples only. Other examples may differ from those described herein. Figure 2 The content depicted.

[0047] In some cases, different types of devices supporting different types of applications and / or services may coexist in a cellular cell. Examples of different types of devices include UE handsets, customer premises equipment (CPE), vehicles, Internet of Things (IoT) devices, and the like. 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, vehicles to everything (V2X) applications, and the like. In addition, in some cases, a single device may support different applications or services simultaneously.

[0048] As described above, wireless communication may occur in a scenario where the UE is traveling on a high-speed train, such as a train moving at a speed of more than 300 km / h. For sub-6 GHz systems (e.g., LTE, NR FR1 (New Radio Frequency One), etc.), a single frequency network (SFN) approach is generally considered. In the SFN approach, multiple TRPs transmit the same data on the same frequency and time resources without analog beamforming. For millimeter wave systems (e.g., NR FR2 (New Radio Frequency Two)), a more advanced approach is adopted due to the use of analog beamforming. Beam management is specified for NR FR2. Beam management methods have been well developed for normal FR2 deployment scenarios. However, beam management methods for normal scenarios may not be applicable to high-speed train scenarios. For example, analog beam determination based on beam sweeping (e.g., current solutions) may not work due to the high speed of the UE.

[0049] Different types of analog beam management can be used for HST scenarios in mmWave communications. In other words, beam management for high-speed train scenarios is different from beam management for normal UE scenarios. For example, beam management for normal scenarios can be based on beam sweeping. In contrast, beam management for high-speed train scenarios uses a predetermined beam pattern based on UE speed, or only one (or a few) fixed analog beams, for example.

[0050] Figure 3 is a diagram illustrating simulated beam management for a high-speed train scenario according to aspects of the present disclosure. Figure 3 , UE 350 is traveling on a train along a train track 360 in the direction of the arrow. The beam from the first transmit receive point (TRP) 310 sweeps from time t1 to time t5 to follow UE 350. The beam from the second TRP 312 also sweeps from time t5 to time t9 to follow UE 350 as UE 350 moves along track 360. The beam from the third TRP 314 sweeps from time t9 to time t13 to follow UE 350 as UE 350 continues to move along track 360. In normal mode (as opposed to high-speed train mode), there are multiple candidate beams for data transmission. Each candidate beam may be associated with a synchronization signal block (SSB) or a channel state information reference signal (CSI-RS). TRP 310, TRP 312 select the best beam among the candidate beams based on UE reports. A predetermined beam pattern may be adopted in this high-speed train scenario. Refer again to Figure 3 , there are multiple candidate beams for data transmission. Each candidate beam may be associated with an SSB or a CSI-RS. TRP 310, TRP 312 selects the best beam among the candidate beams based on a predetermined rule and UE speed. For example, a predetermined rule may specify that TRP 310 switches from the leftmost beam to the rightmost beam over time. The rule specifies that the switching occurs without the UE reporting the signal strength associated with each beam. Other predetermined rules are also contemplated.

[0051] Figure 4 is a diagram illustrating fixed beams along a railway according to aspects of the present disclosure. Figure 4 , fixed analog beams 414, 416 from each TRP 410, 412 are aligned to provide coverage for UE 350 traveling on a high-speed train. In this example of beam management for a high-speed train (HST) scenario, only one beam is transmitted from each TRP. Only one candidate beam is used for data transmission. One candidate beam can be associated with either SSB or CSI-RS. The gNB always uses this beam.

[0052] Different beam scenarios exist because high-speed train scenarios may have different characteristics from other normal deployment scenarios. For example, remote radio heads (RRHs) or transmit receive points (TRPs) may have different layouts for different scenarios. For high-speed train scenarios, RRHs and TRPs are generally located along the railway, such as Figure 3 and Figure 4 For the normal scenario, there is no similar behavior. For the high-speed train scenario, the channel is typically line-of-sight (LOS) and has a high Doppler frequency. In the normal scenario, the channel can be non-line-of-sight with a low Doppler frequency. In the high-speed train scenario, UE position and movement are predictable. In the normal scenario, this is usually not the case.

[0053] Accordingly, specific procedures (including beam management) and / or configurations may be specified for high-speed train scenarios. Therefore, if a "high-speed train (HST)" scenario is detected, the base station and the UE may switch to a specific mode for high-speed trains. Various aspects of the present disclosure describe how a base station and a UE detect an HST scenario. In a first aspect, a base station detects a high-speed train scenario and activates a high-speed train mode by notifying the UE of a mode change. The base station may estimate the movement of the UE (e.g., based on an uplink signal received from one TRP or from multiple TRPs). For example, the base station may estimate the Doppler shift based on an uplink signal received from one TRP (or multiple TRPs). In another example, the base station may predict the UE speed based on an uplink signal received from one or more TRPs (e.g., two adjacent TRPs). Once the base station determines that the UE is in a high-speed train scenario, the base station instructs the UE to enter a high-speed train (HST) mode. The instruction may be sent via downlink control information (DCI), a media access control-control element (MAC-CE), or a radio resource control (RRC) signaling. After the HST mode is activated, the procedures (eg, beam management) of the base station and the UE are different from those for the normal mode.

[0054] In another aspect of the present disclosure, the UE detects a high-speed train scenario. After detecting the high-speed train scenario, the UE reports it to the base station. Based on the UE report, the base station decides how to proceed. In appropriate circumstances, the base station activates a high-speed train (HST) mode and notifies the UE of the mode change.

[0055] There are various ways in which a UE can detect a high-speed train scenario. Any combination of the following options may be employed.

[0056] In a first option, the received downlink signals may be analyzed (eg, SSB, CSI-RS, etc.) For example, the Doppler shift may be measured to determine the UE speed.

[0057] In another option, the downlink signal strength may be monitored for multiple TRPs. The speed may be determined based on the change in signal strength between the two (or more) TRPs. A more detailed explanation will now be provided. In this example, SSBs are transmitted on different beams. Again referring to Figure 3 , SSB is broadcast on the beam corresponding to times t1, t2, t3, t4, and t5 from the first TRP 310. SSB is broadcast on the beam corresponding to times t5, t6, t7, t8, and t9 for the second TRP 312. The UE 350 traveling on the high-speed train track 360 averages the signal strengths from the beams on the first TRP 310. The UE 350 then compares the first TRP average signal strength with the average signal strength of the signal received from the second TRP 312. The speed of the UE 350 can be determined based on how quickly the average signal strength changes between the first TRP 310 and the second TRP 312.

[0058] In yet another option, the UE speed may be determined based on a detected pattern of the wireless link (eg, received signal strength variations of SSBs from one or more TRPs). Figure 5A and 5B is a diagram illustrating different beam modes according to various aspects of the present disclosure. Figure 5A , the UE measures the SSB sent on each beam 520-524 from TRP 510. The signal strength from beam 520 is the strongest, and beams 522 and 524 are slightly weaker. Figure 5B As can be seen in Figure 1, the signal strength pattern will be different if the UE is located in different locations. Figure 5B In the example, beam 526 has a stronger signal strength than the weaker beam 528. Based on a comparison of these patterns, the UE can estimate its speed. Additionally, the UE can consider additional TRPs (e.g., Figure 3 The signal strength pattern associated with the second TRP 312) can be used to further improve the speed estimate.

[0059] In yet another option, the UE may determine whether it is in a high-speed train scenario through UE sensors. For example, the UE may estimate its speed based on GPS or motion / speed sensors.

[0060] In yet another option, the UE may determine that it is in a high-speed train scenario by identifying an application-level indicator. For example, an application triggered by a user may notify the UE of the high-speed train scenario. The user may turn on a "train mode" (similar to an airplane mode) on the UE. In another example, the user may run a specific application designed to provide improved services on a high-speed train. In each of these scenarios, the UE will identify that it is in a high-speed train mode based on an application-level indicator.

[0061] The indication of high speed train detection from UE to base station may be sent via UCI, MAC-CE or RRC signaling. The indication of high speed train (HST) mode change (from base station to UE) may be sent via DCI, MAC-CE or RRC signaling.

[0062] When the UE leaves the high-speed scene, the UE may switch back to normal mode. For example, the UE may detect that it is no longer in the high-speed scene and notify the base station. The base station may then instruct the UE to return to normal mode. Similarly, the base station may independently detect that the UE is no longer in the high-speed scene, and then instruct the UE to enter normal mode. Figure 6 is a diagram illustrating an example process 600, performed, for example, by a base station, in accordance with various aspects of the present disclosure. The example process 600 is an example of detection of a high-speed train scene and indication of a high-speed train (HST) mode.

[0063] like Figure 6 As shown in , in some aspects, process 600 may include detecting that a UE (user equipment) is in a high-speed train scenario (block 602). For example, a base station (e.g., using antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, memory 242, etc.) may perform the detection.

[0064] like Figure 6 As shown in , in some aspects, process 600 may include instructing the UE to enter a high speed train (HST) mode when the UE is detected to be in a high speed train scenario (block 604). For example, the base station (e.g., using antenna 234, MOD 232, TX MIMO processor 230, transmit processor 220, controller / processor 240, memory 242, etc.) may instruct the UE.

[0065] like Figure 6 As shown, in some aspects, process 600 may include performing beam management according to the HST mode (block 606). For example, the base station (e.g., using antenna 234, MOD / DEMOD 232, TX MIMO processor 230, transmit processor 220, MIMO detector 236, receive processor 238, controller / processor 240, memory 242, etc.) may perform beam management according to the HST mode.

[0066] Figure 7 is a diagram illustrating an example process 700, performed, for example, by a UE, in accordance with various aspects of the present disclosure. The example process 700 is an example of detection of a high-speed train scenario and indication of a high-speed train (HST) mode.

[0067] like Figure 7As shown, in some aspects, process 700 may include receiving an instruction from a base station to enter a high speed train (HST) mode (block 702). For example, the UE (e.g., using antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, controller / processor 280, memory 282, etc.) may receive an instruction from a base station to enter a high speed train (HST) mode.

[0068] like Figure 7 As shown, in some aspects, process 700 may include performing beam management according to the HST mode (block 704). For example, the UE (e.g., using antenna 252, MOD / DEMOD 254, TX MIMO processor 266, transmit processor 264, MIMO detector 256, receive processor 258, controller / processor 280, memory 282, etc.) may perform beam management according to the HST mode.

[0069] Various implementation examples are described in the following numbered clauses.

[0070] 1. A wireless communication method for UE (user equipment), comprising:

[0071] receiving a command from a base station to enter a high speed train (HST) mode; and

[0072] Beam management is performed according to the HST mode.

[0073] 2. The method of clause 1, further comprising:

[0074] Detecting that the UE is in a high-speed train scenario; and

[0075] The high-speed train scene is reported to the base station to trigger the sending of the instruction.

[0076] 3. The method of any of the preceding clauses, further comprising detecting the high speed train scene based on a measured Doppler shift of the received downlink signal.

[0077] 4. The method of any of the preceding clauses, further comprising detecting the high-speed train scenario based on downlink signal strength variations between a plurality of transmit receive points (TRPs).

[0078] 5. The method of any of the preceding clauses, further comprising detecting the high-speed train scenario based on a pattern change in downlink signals received from at least one wireless transmit reception point (TRP).

[0079] 6. The method of any of the preceding clauses, further comprising detecting the high-speed train scenario based on UE sensors and / or application level indicators.

[0080] 7. The method of any of the preceding clauses, further comprising reporting the high-speed train scenario via uplink control information (UCI), radio resource control (RRC) signaling, or medium access control-control element (MAC-CE).

[0081] 8. The method of clause 1, wherein performing beam management according to the HST mode comprises selecting a beam based on UE speed and a predetermined rule.

[0082] 9. The method of clause 1, further comprising returning to the normal mode from the high speed train (HST) mode in response to receiving an instruction from the base station to enter the HST mode.

[0083] 10. The method of clause 1, further comprising receiving the instruction via downlink control information (UCI), radio resource control (RRC) signaling, or medium access control-control element (MAC-CE).

[0084] 11. A method for performing wireless communication by a base station, comprising:

[0085] It is detected that the UE (user equipment) is in a high-speed train scenario;

[0086] instructing the UE to enter a high speed train (HST) mode when the UE is detected to be in a high speed train scenario; and

[0087] Beam management is performed according to the HST mode.

[0088] 12. The method of clause 11, further comprising instructing the UE via downlink control information (DCI), radio resource control (RRC) signaling, or medium access control-control element (MAC-CE).

[0089] 13. The method of clause 11, wherein the detection is based on an uplink signal received from the UE.

[0090] 14. A method as in any of clauses 11-13, further comprising detecting based on: a Doppler shift determined from uplink signals received at one or more transmit receive points (TRPs) or a predicted UE speed determined from uplink signals received at multiple TRPs.

[0091] 15. The method of clause 11, wherein the detecting comprises receiving an indication from the UE that the UE is in a high speed train scenario.

[0092] 16. A base station for wireless communication, comprising:

[0093] Memory, and

[0094] at least one processor operatively coupled to the memory, the memory and the at least one processor being configured to:

[0095] It is detected that the UE (user equipment) is in a high-speed train scenario;

[0096] When the UE is detected to be in a high-speed train scene, the UE is instructed to enter the high-speed train

[0097] (HST) mode; and

[0098] Beam management is performed according to the HST mode.

[0099] 17. The base station of clause 16, wherein the at least one processor is further configured to instruct the UE via downlink control information (DCI), radio resource control (RRC) signaling, or medium access control - control element (MAC-CE).

[0100] 18. The base station of clause 16, wherein the at least one processor is further configured to detect based on an uplink signal received from the UE.

[0101] 19. A base station as in any of clauses 16-18, wherein the at least one processor is further configured to detect based on: a Doppler shift determined based on uplink signals received at one or more transmit receive points (TRPs) or a predicted UE speed determined based on uplink signals received at multiple TRPs.

[0102] 20. The base station of clause 16, wherein the at least one processor is further configured to detect by receiving an indication from the UE that the UE is in a high speed train scenario.

[0103] 21. A UE (user equipment) for wireless communication, comprising:

[0104] Memory, and

[0105] at least one processor operatively coupled to the memory, the memory and the at least one processor being configured to:

[0106] receiving a command from a base station to enter a high speed train (HST) mode; and

[0107] Beam management is performed according to the HST mode.

[0108] 22. The UE of clause 21, wherein the at least one processor is further configured to: detect that the UE is in a high-speed train scenario; and

[0109] Report the high-speed train scene to the base station.

[0110] 23. The UE of clause 21 or 22, wherein the at least one processor is further configured to detect the high speed train scenario based on a measured Doppler shift of the received downlink signal.

[0111] 24. The UE of clause 21 or 22, wherein the at least one processor is further configured to detect the high-speed train scenario based on downlink signal strength variations between a plurality of transmit reception points (TRPs).

[0112] 25. A UE as described in clause 21 or 22, wherein the at least one processor is further configured to detect the high-speed train scenario based on a pattern change in downlink signals received from at least one radio transmit reception point (TRP).

[0113] 26. The UE of clause 21 or 22, wherein the at least one processor is further configured to detect the high-speed train scenario based on UE sensors and / or application level indicators.

[0114] 27. A UE as in clause 21 or 22, wherein the at least one processor is further configured to report the high-speed train scenario via uplink control information (UCI), radio resource control (RRC) signaling, or media access control-control element (MAC-CE).

[0115] 28. The UE of clause 21, wherein the at least one processor is further configured to receive the instruction via downlink control information (DCI), radio resource control (RRC) signaling, or medium access control-control element (MAC-CE).

[0116] 29. The UE of clause 21, wherein the at least one processor is further configured to perform beam management according to the HST mode by selecting a beam based on UE speed and a predetermined rule.

[0117] 30. The UE of clause 21, wherein the at least one processor is further configured to return to the normal mode from the high speed train (HST) mode in response to receiving an instruction from the base station to enter the HST mode.

[0118] The foregoing 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 may be made in light of the above disclosure or may be acquired by practice of the various aspects.

[0119] As used herein, the term "component" is intended to be broadly interpreted as hardware, firmware, and / or a combination of hardware and software. As used, a processor is implemented with hardware, firmware, and / or a combination of hardware and software.

[0120] Some aspects are described in conjunction with a threshold value. As used, satisfying a threshold value may refer to a value being greater than a threshold value, greater than or equal to a threshold value, less than a threshold value, less than or equal to a threshold value, equal to a threshold value, not equal to a threshold value, etc., depending on the context.

[0121] It will be apparent that the described systems and / or methods can be implemented in various forms of hardware, firmware, and / or a combination of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods does not limit the aspects. Thus, the operation and behavior of these systems and / or methods are described without reference to specific software code - it is understood that software and hardware can be designed to implement these systems and / or methods based at least in part on the description herein.

[0122] Although specific feature combinations are described in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. In fact, many of these features can be combined in a manner that is not specifically described in the claims and / or not disclosed in the specification. Although each of the dependent claims listed below can be directly subordinate to only one claim, the disclosure of various aspects includes that each dependent claim is combined with each other claim in this group of claims. The phrase "at least one of a column of items" refers to any combination of these 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, and any combination with multiple identical elements (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other ordering of a, b and c).

[0123] The elements, actions or instructions used should not be interpreted as critical or necessary unless explicitly described as such. Moreover, as used, the articles "one" and "a" 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, non-related items, combinations of related and non-related items, etc.), and can be used interchangeably with "one or more". In the case of intending to have only one item, the phrase "only one" or similar language is used. Moreover, as used, the terms "having", "containing", "including", etc. are intended to be open terms. In addition, the phrase "based on" is intended to mean "based at least in part on", unless otherwise explicitly stated.

Claims

1. A wireless communication method for a user equipment UE, comprising: detecting that the UE is in a high-speed train (HST) scenario based on a rate of change between a first average downlink signal strength of a signal received from a first TRP among a plurality of transmission reception points (TRPs) and a second average downlink signal strength of a signal received from a second TRP among the plurality of TRPs; Reporting the HST scenario to a base station; receiving an instruction from the base station to enter an HST mode based on the report; as well as Beam management is performed according to the HST mode. 2 . The method of claim 1 , further comprising detecting the HST scenario based on a measured Doppler shift of the received downlink signal. 3 . The method of claim 1 , further comprising detecting the HST scenario based on UE sensors and / or application level indicators. 4 . The method of claim 1 , further comprising reporting the HST scenario via uplink control information (UCI), radio resource control (RRC) signaling, or media access control (MAC-CE).

5. The method of claim 1, wherein: Performing beam management according to the HST mode includes selecting a beam based on UE speed and a predetermined rule.

6. The method of claim 1, further comprising returning from the HST mode to a normal mode in response to receiving an instruction from the base station to enter an HST mode.

7. The method of claim 1, further comprising receiving the instruction via downlink control information (DCI), radio resource control (RRC) signaling, or media access control (MAC-CE).

8. A wireless communication method for a user equipment UE, comprising: detecting that the UE is in a high-speed train (HST) scenario based on a change in a beam signal strength pattern in a downlink signal received from a wireless transmission reception point (TRP), the downlink signal having a beam signal strength pattern, the beam signal strength pattern including a plurality of beams from the one wireless TRP, each beam in the plurality of beams having a measured signal strength that varies based on a location of the UE; Reporting the HST scenario to a base station; receiving an instruction from the base station to enter an HST mode based on the report; and Beam management is performed according to the HST mode.

9. A user equipment UE for wireless communication, comprising: Memory, and at least one processor operatively coupled to the memory, the memory and the at least one processor being configured to: detecting that the UE is in a high-speed train (HST) scenario based on a rate of change between a first average downlink signal strength of a signal received from a first TRP among a plurality of transmission reception points (TRPs) and a second average downlink signal strength of a signal received from a second TRP among the plurality of TRPs; Reporting the HST scenario to a base station; receiving an instruction from the base station to enter an HST mode based on the report; as well as Beam management is performed according to the HST mode.

10. The UE of claim 9, wherein the at least one processor is further configured to detect the HST scenario based on a measured Doppler shift of the received downlink signal.

11. The UE of claim 9, wherein the at least one processor is further configured to detect the HST scenario based on UE sensors and / or application level indicators.

12. The UE of claim 9, wherein the at least one processor is further configured to report the HST scenario via uplink control information (UCI), radio resource control (RRC) signaling, or medium access control (MAC-CE).

13. The UE of claim 9, wherein the at least one processor is further configured to receive the instruction via downlink control information (DCI), radio resource control (RRC) signaling, or media access control (MAC-CE).

14. The UE of claim 9, wherein the at least one processor is further configured to perform beam management according to the HST mode by selecting a beam based on UE speed and a predetermined rule.

15. The UE of claim 9, wherein the at least one processor is further configured to return from the HST mode to the normal mode in response to receiving an instruction from the base station to enter the HST mode.

16. A user equipment UE for wireless communication, comprising: Memory, and at least one processor operatively coupled to the memory, the memory and the at least one processor being configured to: detecting a high speed train (HST) scenario based on a beam signal strength pattern variation in a downlink signal received from one wireless transmit reception point (TRP), the downlink signal having a beam signal strength pattern, the beam signal strength pattern including a plurality of beams from the one wireless TRP, each beam of the plurality of beams having a measured signal strength that varies based on a location of the UE; Reporting the HST scenario to a base station; receiving an instruction from the base station to enter an HST mode based on the report; and Beam management is performed according to the HST mode.

17. A user equipment UE for wireless communication, comprising means for executing the method according to any one of claims 1 to 8.

18. A computer readable medium storing instructions which, when executed by a processor of user equipment, cause the processor to perform the method of any one of claims 1 to 8.

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