For continuous connection in single frequency network

Abstract

Various aspects of the present disclosure generally relate to wireless communications. In some aspects, a user equipment (UE) may determine a measurement of a wireless signal from a first base station of a network, the measurement comprising one or more of the following: a Doppler shift of the wireless signal, or an angular change of the wireless signal; determine, based at least in part on the measurement, that a high-speed train or tunnel (HSTT) event has occurred; provide an indication to the first base station that the HSTT event has occurred; and receive configuration information from the first base station to perform the following operations: configure the UE for handover to a second base station of the network, configure the UE for beam switching, or cause the UE to change a connection state. Numerous other aspects are provided.

Description

[0001] Public domain

[0002] Aspects of the present disclosure relate generally to wireless communications, and to techniques and apparatus for persistent connectivity for a single frequency network.

[0003] background

[0004] 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).

[0005] 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, a gNB, an Access Point (AP), a Radio Head, a Transmit Receive Point (TRP), a New Radio (NR) BS, a 5G Node B, and the like.

[0006] The above multiple access technologies have been adopted in various telecommunication standards to provide common protocols that enable 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. However, as the demand for mobile broadband access continues to grow, there is a need for further improvements in LTE and NR technologies. Preferably, these improvements should be applicable to other multiple access technologies and telecommunication standards that adopt these technologies.

[0007] Overview

[0008] In some aspects, a wireless communication method performed by a user equipment (UE) may include: determining, by the UE, a measurement of a wireless signal from a first base station of a network, the measurement including one or more of the following: a Doppler shift of the wireless signal, or an angular change of the wireless signal; determining, by the UE, that a high-speed train or tunnel (HSTT) event has occurred based at least in part on one or more of the following: the Doppler shift satisfies a Doppler shift threshold, or the angular change satisfies an angular change threshold; providing, by the UE, an indication that an HSTT event has occurred to the first base station; and receiving, by the UE, configuration information from the first base station to perform the following operations: configuring the UE to switch to a second base station of the network based at least in part on the HSTT event, configuring the UE to perform beam switching based at least in part on the HSTT event, or causing the UE to change a connection state based at least in part on the HSTT event.

[0009] In some aspects, a wireless communication method performed by a first base station of a network may include: receiving, by the first base station, an indication that an HSTT event has occurred from a UE; and providing, by the first base station, configuration information to the UE to perform the following operations: configuring the UE to switch to a second base station of the network based at least in part on the HSTT event, configuring the UE to perform beam switching based at least in part on the HSTT event, or causing the UE to change a connection state based at least in part on the HSTT event.

[0010] In some aspects, a wireless communication method performed by a first base station of a network may include: determining, by the first base station, that an HSTT event has occurred based at least in part on one or more of the following: a Doppler shift measurement of a wireless signal provided by a UE by the first base station satisfies a Doppler shift threshold, an angle change measurement of a wireless signal provided by the first base station to the UE satisfies an angle change threshold, or the location of the UE; and providing configuration information to the UE by the first base station to perform the following operations: configuring the UE to switch to a second base station of the network based at least in part on the HSTT event, configuring the UE to perform beam switching based at least in part on the HSTT event, or causing the UE to change a connection state based at least in part on the HSTT event.

[0011] In some aspects, a UE for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: determine, by the UE, a measurement of a wireless signal from a first base station of a network, the measurement including one or more of the following: a Doppler shift of the wireless signal, or an angle change of the wireless signal; determine, by the UE, that an HSTT event has occurred based at least in part on one or more of the following: the Doppler shift satisfies a Doppler shift threshold, or the angle change satisfies an angle change threshold; provide, by the UE, an indication that an HSTT event has occurred to the first base station; and receive, by the UE, configuration information from the first base station to perform the following operations: configure the UE to switch to a second base station of the network based at least in part on the HSTT event, configure the UE to perform beam switching based at least in part on the HSTT event, or cause the UE to change a connection state based at least in part on the HSTT event.

[0012] In some aspects, a base station for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: receive, by a first base station, an indication from a UE that an HSTT event has occurred; and provide, by the first base station, configuration information to the UE to perform the following operations: configure the UE to switch to a second base station of a network based at least in part on the HSTT event, configure the UE to perform beam switching based at least in part on the HSTT event, or cause the UE to change a connection state based at least in part on the HSTT event.

[0013] In some aspects, a base station for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: determine that an HSTT event has occurred based at least in part on one or more of: a Doppler shift measurement of a wireless signal provided by a UE by a first base station satisfies a Doppler shift threshold, an angle change measurement of a wireless signal provided by the UE by the first base station satisfies an angle change threshold, or a location of the UE; and provide configuration information to the UE to perform the following operations: configure the UE to switch to a second base station of the network based at least in part on the HSTT event, configure the UE to perform beam switching based at least in part on the HSTT event, or cause the UE to change a connection state based at least in part on the HSTT event.

[0014] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a UE, may cause the one or more processors to: determine a measurement of a wireless signal from a first base station of a network, the measurement comprising one or more of the following: a Doppler shift of the wireless signal, or an angle change of the wireless signal; determine that an HSTT event has occurred based at least in part on one or more of the following: the Doppler shift satisfies a Doppler shift threshold, or the angle change satisfies an angle change threshold; provide an indication that an HSTT event has occurred to the first base station; and receive configuration information from the first base station to: configure the UE to switch to a second base station of the network based at least in part on the HSTT event, configure the UE to perform beam switching based at least in part on the HSTT event, or cause the UE to change a connection state based at least in part on the HSTT event.

[0015] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a base station, may cause the one or more processors to: receive an indication from a UE that an HSTT event has occurred; and provide configuration information to the UE to perform the following operations: configure the UE to switch to a second base station of the network based at least in part on the HSTT event, configure the UE to perform beam switching based at least in part on the HSTT event, or cause the UE to change a connection state based at least in part on the HSTT event.

[0016] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a base station, may cause the one or more processors to: determine that an HSTT event has occurred based at least in part on one or more of the following: a Doppler shift measurement of a wireless signal provided by a UE by a first base station satisfies a Doppler shift threshold, an angle change measurement of a wireless signal provided by the UE by the first base station satisfies an angle change threshold, or the location of the UE; and provide configuration information to the UE to perform the following operations: configure the UE to switch to a second base station of the network based at least in part on the HSTT event, configure the UE to perform beam switching based at least in part on the HSTT event, or cause the UE to change a connection state based at least in part on the HSTT event.

[0017] In some aspects, an apparatus for wireless communications may include: a device for determining a measurement of a wireless signal from a first base station of a network, the measurement comprising one or more of: a Doppler shift of the wireless signal, or an angular change of the wireless signal; a device for determining that an HSTT event has occurred based at least in part on one or more of: the Doppler shift satisfying a Doppler shift threshold, or the angular change satisfying an angular change threshold; a device for providing an indication to the first base station that an HSTT event has occurred; and a device for receiving configuration information from the first base station to configure the device to switch to a second base station of the network based at least in part on the HSTT event, configure the device to perform beam switching based at least in part on the HSTT event, or cause the device to change a connection state based at least in part on the HSTT event.

[0018] In some aspects, an apparatus for wireless communication may include: a device for receiving an indication that an HSTT event has occurred from a UE; and a device for providing configuration information to the UE to perform the following operations: configuring the UE to switch to a base station of a network based at least in part on the HSTT event, configuring the UE to perform beam switching based at least in part on the HSTT event, or causing the UE to change a connection state based at least in part on the HSTT event.

[0019] In some aspects, a device for wireless communication may include: a device for determining that an HSTT event has occurred based at least in part on one or more of the following: a Doppler shift measurement of a wireless signal provided by a UE by the device satisfying a Doppler shift threshold, an angle change measurement of a wireless signal provided by the device to the UE satisfying an angle change threshold, or the location of the UE; and a device for providing configuration information to the UE to perform the following operations: configuring the UE to switch to a base station based at least in part on the HSTT event, configuring the UE to perform beam switching based at least in part on the HSTT event, or causing the UE to change a connection state based at least in part on the HSTT event.

[0020] Aspects generally include methods, apparatus, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices, and / or processing systems as substantially described herein with reference to and as illustrated in the accompanying drawings and specification.

[0021] The foregoing has broadly outlined the features and technical advantages of examples according to the present disclosure in an effort to make the following detailed description better understood. Additional features and advantages will be described hereinafter. The disclosed concepts and specific examples can be easily used as a basis for modifying or designing other structures for implementing the same purpose as the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein, both in terms of their organization and method of operation, and the associated advantages will be better understood by considering the following description in conjunction with the accompanying drawings. Each of the accompanying drawings is provided for the purpose of illustration and description and is not intended to define limitations on the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to understand the above-stated features of the present disclosure in detail, the above briefly summarized content may be described in more detail 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 typical 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.

[0024] Figure 1 is a block diagram conceptually illustrating an example of a wireless communication network in accordance with various aspects of the present disclosure.

[0025] Figure 2 is a block diagram conceptually illustrating an example of a base station and a UE in communication in a wireless communication network according to various aspects of the present disclosure.

[0026] Figure 3A is a block diagram conceptually illustrating an example of a frame structure in a wireless communication network in accordance with various aspects of the present disclosure.

[0027] Figure 3B is a block diagram conceptually illustrating an example synchronous communication hierarchy in a wireless communication network in accordance with various aspects of the present disclosure.

[0028] Figure 4 is a diagram illustrating an example of user equipment in a high-speed train or tunnel environment in accordance with various aspects of the present disclosure.

[0029] Figure 5 is a diagram illustrating an example of configuring a user equipment based at least in part on a high-speed train or tunnel event in accordance with various aspects of the present disclosure.

[0030] Figure 6 is a diagram illustrating an example of configuring a user equipment based at least in part on a high-speed train or tunnel event in accordance with various aspects of the present disclosure.

[0031] Figure 7 is a diagram illustrating an example of user equipment in a high-speed train or tunnel environment in accordance with various aspects of the present disclosure.

[0032] Figure 8 is a diagram illustrating an example process, performed, for example, by user equipment, in accordance with various aspects of the present disclosure.

[0033] Fig. 9 is a diagram illustrating an example process, eg, performed by a network entity, according to various aspects of the present disclosure.

[0034] Fig.10 is a diagram illustrating an example process, eg, performed by a network entity, according to various aspects of the present disclosure.

[0035] Detailed Description

[0036] 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. At least partially based on the teachings herein, it should be appreciated by those skilled in the art that the scope of the present disclosure is intended to cover any aspect of the present disclosure disclosed herein, whether it is independently implemented or implemented in combination with any other aspect of the present disclosure. For example, any number of aspects set forth herein 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 practiced using supplements or other other structures, functionality, or structures and functionality as the various aspects of the present disclosure set forth herein. It should be understood that any aspect of the present disclosure disclosed herein can be implemented by one or more elements of the claims.

[0037] 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.

[0038] It should be noted that although various aspects may be described herein using terminology typically associated with 3G and / or 4G wireless technologies, various aspects of the present disclosure may be applied in communication systems based on other generations, such as 5G and later generations, including NR technologies.

[0039] Figure 1 1 is a diagram illustrating a wireless network 100 in which various aspects of the present disclosure may be practiced. The wireless network 100 may be an LTE network or some other wireless network, such as a 5G or NR network. The wireless network 100 may include several BSs 110 (shown 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, B node, gNB, 5G B node (NB), access point, transmit receive 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.

[0040] 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 1In 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", "B node", "5G NB", and "cell" may be used interchangeably herein.

[0041] In some aspects, the cells may not necessarily be stationary, 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.

[0042] 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.

[0043] 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).

[0044] 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.

[0045] 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, an industrial manufacturing equipment, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium.

[0046] 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). UE120 may be included inside a housing that houses components of UE 120, such as a processor component, a memory component, and the like.

[0047] In general, any number of wireless networks may be deployed in a given geographic area. Each wireless network may support a specific radio access technology (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.

[0048] 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.

[0049] As indicated above, Figure 1 are provided as examples. Other examples may differ from those described in Figure 1 Examples described.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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 232, 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.

[0054] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2Any other component(s) of the base station 110 may perform one or more techniques associated with configuring user equipment based at least in part on a high-speed train or tunnel (HSTT) event, 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 the Figure 8 The process of 800 Fig. 9 The process of 900 Fig.10 1000, 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. In some aspects, memory 242 and / or memory 282 may include: a non-transitory computer-readable medium storing one or more instructions for wireless communication. For example, the one or more instructions, when executed by one or more processors of base station 110 and / or UE 120, may perform or direct, for example, Figure 8 The process of 800 Fig. 9 The process of 900 Fig.10 The scheduler 246 may schedule UEs for data transmission on the downlink and / or uplink.

[0055] In some aspects, UE 120 may include: a device for determining a measurement of a wireless signal from a first base station of the network; a device for determining that an HSTT event has occurred; a device for providing an indication to the first base station that an HSTT event has occurred; a device for receiving configuration information from the first base station, etc. The measurement may include one or more of a Doppler shift of the wireless signal or an angular change of the wireless signal. UE 120 may determine that an HSTT event has occurred based at least in part on one or more of the following: the Doppler shift satisfies a Doppler shift threshold, or the angular change satisfies an angular change threshold, etc. The configuration information may be to configure UE 120 to switch to a second base station of the network based at least in part on the HSTT event, to configure UE 120 to perform beam switching based at least in part on the HSTT event, to cause UE 120 to change a connection state based at least in part on HSTT, etc. In some aspects, such a device may include a device in combination with Figure 2 One or more components of UE 120 are depicted, such as controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, and the like.

[0056] In some aspects, base station 110 may include: means for receiving an indication from a UE that an HSTT event has occurred; means for providing configuration information to the UE, etc. The configuration information may be configuring the UE to switch to a second base station of the network based at least in part on the HSTT event, configuring the UE to perform beam switching based at least in part on the HSTT event, causing the UE to change a connection state based at least in part on the HSTT, etc. In some aspects, such means may include combining Figure 2 One or more components of base station 110 are depicted, such as antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, and the like.

[0057] In some aspects, the base station 110 may include: means for determining that an HSTT event has occurred; and means for providing configuration information to the UE, etc. The base station 110 may determine that an HSTT event has occurred based at least in part on one or more of the following: a Doppler shift measurement of a wireless signal provided by the UE by the base station 110 satisfies a Doppler shift threshold; an angle change measurement of a wireless signal provided by the UE by the UE satisfies an angle change threshold; the location of the UE, etc. In some aspects, such means may include a combination of Figure 2 One or more components of base station 110 are depicted, such as antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, and the like.

[0058] As indicated above, Figure 2 are provided as examples. Other examples may differ from those described in Figure 2 Examples described.

[0059] Figure 3A An example frame structure 300 for frequency division duplex (FDD) in a telecommunication system (e.g., NR) is shown. The transmission timeline for each of the downlink and uplink may be divided into units of radio frames (sometimes referred to as frames). Each radio frame may have a predetermined duration (e.g., 10 milliseconds (ms)) and may be divided into a set of Z (Z ≥ 1) subframes (e.g., with indices 0 to Z-1). Each subframe may have a predetermined duration (e.g., 1 ms) and may include a set of time slots (e.g., in Figure 3A Each subframe 2 is shown mtime slots, where m is a parameter design for transmission, such as 0, 1, 2, 3, 4, etc.). Each time slot may include a set of L symbol periods. For example, each time slot may include fourteen symbol periods (e.g., Figure 3A ), seven symbol periods, or another number of symbol periods. In the case where a subframe includes two slots (e.g., when m=1), the subframe may include 2L symbol periods, where the 2L symbol periods in each subframe may be assigned indices 0 to 2L–1. In some aspects, the scheduling unit for FDD may be frame-based, subframe-based, slot-based, symbol-based, etc.

[0060] Although some techniques are described herein in conjunction with frames, subframes, time slots, etc., these techniques may be equally applicable to other types of wireless communication structures that may be referred to in 5G NR using terms other than "frames," "subframes," "time slots," etc. In some aspects, a wireless communication structure may refer to a periodic, time-bounded communication unit defined by a wireless communication standard and / or protocol. Additionally or alternatively, a wireless communication structure may be used in conjunction with Figure 3A The wireless communication structure configurations are different from those shown in FIG.

[0061] In some telecommunications (e.g., NR), a base station may transmit a synchronization (SYNC) signal. For example, a base station may transmit a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and the like on the downlink for each cell supported by the base station. The PSS and SSS may be used by the UE for cell search and acquisition. For example, the PSS may be used by the UE to determine symbol timing, and the SSS may be used by the UE to determine a physical cell identifier associated with the base station and frame timing. The base station may also transmit a physical broadcast channel (PBCH). The PBCH may carry some system information, such as system information that supports initial access of the UE.

[0062] In some aspects, a base station may transmit a PSS, SSS, and / or PBCH according to a synchronization communication level (e.g., a synchronization signal (SS) level) including multiple synchronization communications (e.g., SS blocks), as described below in conjunction with Figure 3B As described.

[0063] Figure 3B is a block diagram conceptually illustrating an example SS hierarchy, which is an example of a synchronous communication hierarchy. Figure 3B As shown in FIG. 1 , the SS hierarchy may include an SS burst set, which may include a plurality of SS bursts (identified as SS burst 0 to SS burst B-1, where B is the maximum number of repetitions of the SS burst that may be transmitted by the base station). As further shown, each SS burst may include one or more SS blocks (identified as SS block 0 to SS block (b max_SS-1), where b max_SS -1 is the maximum number of SS blocks that can be carried by an SS burst). In some aspects, different SS blocks may be beamformed differently. SS burst sets may be transmitted by a wireless node periodically, such as every X milliseconds, e.g. Figure 3B In some aspects, SS burst sets may have fixed or dynamic lengths, such as in Figure 3B is shown as Y milliseconds.

[0064] Figure 3B The SS burst set shown in is an example of a synchronous communication set, and other synchronous communication sets may be used in conjunction with the techniques described herein. Figure 3B The SS blocks shown in are examples of synchronous communications, and other synchronous communications may be used in conjunction with the techniques described herein.

[0065] In some aspects, an SS block includes resources that carry PSS, SSS, PBCH, and / or other synchronization signals (e.g., a third synchronization signal (TSS)) and / or synchronization channels. In some aspects, multiple SS blocks are included in an SS burst, and the PSS, SSS, and / or PBCH may be identical for each SS block across an SS burst. In some aspects, a single SS block may be included in an SS burst. In some aspects, an SS block may be at least four symbol periods in length, with each symbol carrying one or more of a PSS (e.g., occupying one symbol), an SSS (e.g., occupying one symbol), and / or a PBCH (e.g., occupying two symbols).

[0066] In some aspects, the symbols of the SS block are consecutive, such as Figure 3B In some aspects, the symbols of the SS block are non-contiguous. Similarly, in some aspects, one or more SS blocks of an SS burst may be transmitted in contiguous radio resources (e.g., contiguous symbol periods) during one or more time slots. Additionally or alternatively, one or more SS blocks of an SS burst may be transmitted in non-contiguous radio resources.

[0067] In some aspects, an SS burst may have a burst periodicity, whereby each SS block of the SS burst is transmitted by the base station according to the burst periodicity. In other words, the SS blocks may be repeated during each SS burst. In some aspects, an SS burst set may have a burst set periodicity, whereby each SS burst of the SS burst set is transmitted by the base station according to a fixed burst set periodicity. In other words, the SS burst may be repeated during each SS burst set.

[0068] The base station may transmit system information, such as system information blocks (SIBs), on a physical downlink shared channel (PDSCH) in certain time slots. The base station may transmit control information / data on a physical downlink control channel (PDCCH) in C symbol periods of a time slot, where B may be configurable for each time slot. The base station may transmit traffic data and / or other data on the PDSCH in the remaining symbol periods of each time slot.

[0069] As indicated above, Figure 3A and 3B are provided as examples. Other examples may differ from those described in Figure 3A and 3B Examples described.

[0070] Figure 4 is a diagram illustrating an example 400 of a UE in a high-speed train or tunnel environment in accordance with various aspects of the present disclosure. Figure 4 A base station 402 and UEs 404, 406, 408, 410 are shown at various locations along a path of a high speed train or tunnel (HSTT) environment.

[0071] In a HSTT environment, a base station may provide a single frequency network in which multiple base stations transmit and receive communication signals on a single frequency (e.g., a single carrier) to improve frequency efficiency. However, a base station in a HSTT environment may be located along and / or near a path of the HSTT. The base station will provide services to UEs in a HSTT environment in a linear path rather than a circular area. This may result in an increased Doppler shift when the UE is relatively far from the base station (e.g., because the UE is traveling almost directly toward or away from the base station in a HSTT environment), a larger angular velocity when the UE is relatively close to the base station, etc.

[0072] UE 404 may have a relatively low angular variation, which may allow UE 404 to communicate with base station 402 using a beam with relative reliability. Additionally, UE 404 may have a relatively high velocity (e.g., greater than 100 miles per hour) along the HSTT path, which is generally toward base station 402. The high velocity generally toward base station 402 may result in a relatively large positive Doppler shift of wireless signals transmitted to and / or received from base station 402.

[0073] UE 406 may have a relatively high angular variation, which is based at least in part on UE 406 traveling at a relatively close location to base station 402 and / or at least in part on UE 406 traveling at a relatively high speed along the HSTT path. The relatively high angular variation may cause UE 406 to attempt to quickly track and switch beams to maintain a connection with base station 402. However, based at least in part on the capabilities of the UE, measuring and responding to relatively high angular variations may be difficult. For example, UE 406 may not be able to measure the beam quickly enough and then switch the beam to maintain a continuous connection with base station 402. Additionally, UE 406 may have a speed similar to that of UE 404 in the direction of the HSTT path, but UE 406 is not moving in a direction generally toward base station 402. Thus, the rate of change of the distance between UE 406 and base station 402 may be less than the rate of change of the distance between UE 404 and base station 402 , which will result in a positive Doppler shift for UE 406 's communications, albeit not as large as that for UE 404 .

[0074] Similar to UE 406, UE 408 may have a relatively high angular variation, which is at least partially based on UE 408 traveling at a relatively close position to base station 402 and / or at least partially based on UE 408 traveling at a relatively high speed along the HSTT path. For UE 406, measuring and responding to relatively high angular variations may be difficult. However, UE 408 may observe a deceleration of angular velocity as it moves away from base station 402, which may stabilize beam selection and / or reduce the need for beam switching. UE 408 may have a high speed along a HSTT path away from base station 402, wherein the rate of change of the distance between UE 408 and base station 402 is less than the rate of change of the distance between UE 410 and base station 402, because UE 410 moves along the HSTT path in a direction generally away from base station 402. This means that the Doppler shift of UE 408 may be a negative Doppler shift for wireless signals transmitted to and / or received from base station 402 , although not as large as the negative Doppler shift of UE 410 .

[0075] Similar to UE 404, UE 410 may have a relatively low angular variation, which may allow UE 410 to communicate with base station 402 using a beam with reliability. Additionally, UE 404 may have a relatively high speed (e.g., greater than 100 miles per hour) substantially away from base station 402, which may result in a relatively large negative Doppler shift of wireless signals transmitted to and / or received from base station 402.

[0076] As the UEs travel at relatively high speeds along the HSTT path, UEs traveling between different locations shown by UEs 404, 406, 408, 410 may lose connectivity based at least in part on changes in Doppler shift and angle changes. For example, a UE traveling between the location of UE 406 and the location of UE 408 may experience a large change in Doppler shift (e.g., 1000 Hz or more) for signals transmitted to and / or received from base station 402. This large change in Doppler shift may result in a loss of connectivity between the UE and base station 402 because the UE may not be able to perform frequency tracking quickly enough to maintain connectivity through this significant change in the observed frequency of the wireless signal. Additionally, a UE traveling between the location of UE 406 and the location of UE 408 (e.g., a location relatively close to base station 402 along a HSTT path) may lose connection with base station 402 due to relatively high angular changes, where the UE may be unable to measure and respond to the relatively high angular changes based at least in part on the relatively high speed and / or proximity to base station 402.

[0077] In some aspects described herein, an HSTT event may be defined for wireless communications, which, when identified, may cause a base station to provide configuration information to enable a UE to maintain a persistent connection between the UE and a single frequency network operating in an HSTT environment. The threshold may be based at least in part on the capabilities of the UE (e.g., how fast a particular UE can perform beam switching). In some aspects, the event may be identified based at least in part on Doppler shift measurements, angle change measurements, the location of the UE, etc. The conditions for the event and / or the configuration information to be provided to the UE may be defined by the network.

[0078] In some aspects, the UE may determine a measurement of a wireless signal from a first base station. The measurement may include one or more of a Doppler shift of the wireless signal or an angle change of the wireless signal. The UE may determine that an HSTT event has occurred based at least in part on the Doppler shift satisfying a Doppler shift threshold or the angle change satisfying an angle change threshold. The Doppler shift threshold and / or the angle change threshold may be defined by the network and / or may be based at least in part on the capabilities of the UE. The UE may provide an indication to the first base station that an HSTT event has occurred. The indication may include an indication of the measurement or may include an indication with the measurement. The first base station may determine configuration information to be provided to the UE based at least in part on the indication of the HSTT and / or the location of the UE. The UE may receive configuration information from the first base station. The configuration information may be used by the UE to configure the UE for switching to a second base station, configuring the UE for beam switching, or causing the UE to change a connection state based at least in part on the HSTT event.

[0079] In some aspects, the first base station may determine that an HSTT event has occurred based at least in part on: a Doppler shift measurement of a wireless signal provided by the UE (e.g., by the first base station) satisfies a Doppler shift threshold, an angle change measurement of a wireless signal provided by the UE satisfies an angle change threshold, the location of the UE, etc. The first base station may determine configuration information to be provided to the UE based at least in part on the determined HSTT event, and may provide the configuration information to the UE. The configuration information may be used to configure the UE for handover to a second base station, configure the UE for beam switching, or cause the UE to change a connection state based at least in part on the HSTT event.

[0080] In this way, the first base station may cause the UE to be configured to account for Doppler shifts and / or angle changes that may occur in a HSTT environment.The base station may provide configuration information that may be used to increase the likelihood of maintaining a continuous connection with the network.

[0081] Figure 5 is a diagram illustrating an example 500 of configuring a user equipment based at least in part on a high-speed train or tunnel event in accordance with various aspects of the present disclosure. Figure 5 A UE (eg, UE 120) and a base station (eg, base station 110) are shown.

[0082] As indicated by reference numeral 510, the UE may receive a wireless signal from a base station. The wireless signal may be any wireless signal transmitted by a base station, such as a paging channel transmission, a PBCH transmission, a PDCCH transmission, a PDSCH transmission, a PSS, a SSS, and the like.

[0083] As indicated by reference numeral 520, the UE may measure Doppler shift, angle change, etc. from the wireless signal. The UE may measure a positive Doppler shift (e.g., a frequency shift up), a negative Doppler shift, or no Doppler shift. The UE may measure multiple wireless signals to predict an upcoming change in Doppler shift. For example, the UE may measure multiple wireless signals to determine a prediction that the UE will soon observe a change in Doppler shift in communications with a base station (e.g., from positive to negative when the UE passes by the base station).

[0084] If the UE measures a positive Doppler shift, the UE may determine that the UE is traveling toward the base station. If the UE measures a negative Doppler shift, the UE may determine that the UE is traveling away from the base station. If the UE measures no Doppler shift (or almost no Doppler shift), the UE may determine that the UE is substantially not moving, or is moving on a path that is substantially orthogonal to the direct path between the base station and the UE. If the UE measures a series of positive Doppler shifts that are decreasing (e.g., decreasing exponentially), the UE may determine that the UE will soon observe a prediction of a sharp change in Doppler shift (e.g., when the UE passes by a base station).

[0085] As indicated by reference numeral 530, the UE may determine the location of the UE. Positioning information used to determine the location of the UE may include geographic coordinates, relative positioning relative to a base station (e.g., a distance between the UE and the base station), etc. The location of the UE may indicate that the UE is positioned along a HSTT path.

[0086] In some aspects, the UE may measure positioning information using capabilities of the UE (e.g., using components of the UE, such as a global positioning system device). In some aspects, the UE may receive positioning information from another device, such as a base station. For example, the base station may provide positioning information via one or more of radio resource control (RRC) communications, downlink control information (DCI) communications, media access control (MAC) control element (CE) communications, etc.

[0087] As indicated by reference numeral 540, the UE may determine that a HSTT event has occurred. In some aspects, the HSTT event may indicate that a change in Doppler shift has occurred. In some aspects, the HSTT event may indicate that the UE expected and / or predicted a change in Doppler shift based at least in part on measurements of wireless signals, the UE's location, etc.

[0088] In some aspects, the UE may determine that an HSTT event has occurred based at least in part on one or more thresholds provided by the network and / or the base station. In some aspects, the UE may determine that an HSTT event has occurred based at least in part on one or more thresholds related to the capabilities of the UE (e.g., the amount of frequency variation of received wireless signals that the UE can tolerate, the frequency tracking capability of the UE, the beam switching capability, etc.). In some aspects, one or more thresholds for determining that an HSTT event has occurred are based at least in part on the capabilities of the UE and information provided by the network (e.g., threshold definitions based on measurements and capabilities of the UE).

[0089] In some aspects, the UE may determine that a HSTT event has occurred based at least in part on a Doppler shift satisfying a Doppler shift threshold, an angle change satisfying an angle change threshold, a location of the UE, etc. For example, the UE may determine a Doppler shift threshold and an angle change threshold, and may determine that a HSTT event has occurred based at least in part on satisfying one or both of the Doppler shift threshold or the angle change threshold.

[0090] As indicated by reference numeral 550, the UE may provide an indication of a HSTT event to the base station. In some aspects, the indication of the HSTT event includes indicating one or more measurements of the wireless signal to the base station. In some aspects, the UE provides an indication that the HSTT event has occurred without providing one or more measurements of the wireless signal. In some aspects, the indication that the HSTT event has occurred includes an indication of the UE's location.

[0091] As indicated by reference numeral 560, the base station may determine configuration information for the UE based at least in part on the HSTT event. In some aspects, the base station may determine the configuration based at least in part on the location of one or more additional base stations. The base station may determine that if the UE attempts to maintain a connection with the base station using the current beam, the UE will soon observe a change in Doppler shift or an angle change. The base station may determine that a different beam and / or a base station located ahead or behind the UE on the HSTT path is more suitable for maintaining a continuous connection between the network and the UE.

[0092] In some aspects, the configuration information may be determined to configure the UE to switch to a second base station of the network, configure the UE for beam switching, cause the UE to change a connection state, etc., based at least in part on the HSTT event. The configuration information may indicate that the UE is to be configured immediately based at least in part on the configuration information, or to be ready to be configured at a defined time (e.g., after a defined amount of time, at a specific time, at a specific frame, etc.). For example, the configuration information may indicate a multi-step process for beam switching to allow the UE to perform beam switching when the UE approaches and / or passes by a base station. Additionally or alternatively, the configuration may indicate when to begin communicating with another base station to avoid losing connection with the network, and / or may indicate when to switch back to using the base station (e.g., after passing by the base station).

[0093] As indicated by reference numeral 570, the UE may receive configuration information from the base station. In some aspects, the UE may receive the configuration information via DCI communication, RRC communication, MAC CE communication, or the like.

[0094] As indicated by reference numeral 580, the UE may configure the UE based at least in part on the configuration information. For example, the UE may use the configuration information to configure the UE to communicate with a second base station (e.g., ahead on the HSTT path, behind on the HSTT path, etc.) and / or switch beams. In some aspects, the UE may configure the UE to change the communication state (e.g., from an idle mode to a connected mode) based at least in part on the configuration state. Once the UE has passed a base station, the UE may be configured to switch back to communicating with the base station (e.g., the nearest base station).

[0095] In some aspects, the UE may be in an idle mode (e.g., an idle mode connected state) or a discontinuous reception (DRX) mode. The UE may measure the Doppler shift and / or angular change of the wireless signal, the location of the UE, etc. while in the idle mode. The UE may determine that an HSTT event has occurred, and may provide an indication of the HSTT event, determine to communicate with a second base station, communicate using a different beam, etc. In some aspects, based at least in part on the measurement of the Doppler shift and / or angular change of the wireless signal, the location of the UE, etc., the UE may determine to use a random access channel procedure to change from an idle mode or a DRX mode to a connected mode.

[0096] Connected mode may cause the UE to communicate with a base station at a relatively high frequency (e.g., more frequently than when in idle mode), which may help the UE maintain a continuous connection with the network in an HSTT environment. For example, because the UE may be traveling at a relatively high speed (e.g., 100 miles per hour or faster), such as when in idle mode or DRX mode, infrequent communications may cause the UE to be unable to reliably perform beam tracking and / or frequency tracking. This may cause the UE to be unable to receive paging or other messages intended for the UE. Changing from idle mode or DRX mode to connected mode may help the UE maintain a continuous connection with the network (e.g., by providing an indication of an HSTT event and receiving configuration information from one or more base stations).

[0097] As indicated above, Figure 5 are provided as examples. Other examples may differ from those described herein. Figure 5 Examples described.

[0098] Figure 6 is a diagram illustrating an example 600 of configuring a user equipment based at least in part on a high-speed train or tunnel event in accordance with various aspects of the present disclosure. Figure 6 A UE (eg, UE 120) and a base station (eg, base station 110) are shown.

[0099] As shown by reference numeral 610, the base station may receive wireless signals from the UE. The wireless signals may include physical uplink control channel (PUCCH) communications, physical uplink shared channel (PUSCH) communications, physical random access channel (PRACH) communications, and the like.

[0100] As indicated by reference numeral 620, the base station may measure Doppler shifts, angle changes, etc. of wireless signals. The base station may measure a positive Doppler shift (e.g., a frequency shift up), a negative Doppler shift, or no Doppler shift. The base station may measure multiple wireless signals to predict an expected upcoming change in Doppler shift. For example, the base station may measure multiple wireless signals to determine a prediction that a UE and / or base station will soon observe a change in Doppler shift in mutual communications (e.g., a change from positive to negative when the UE passes by the base station).

[0101] If the base station measures a positive Doppler shift, the base station can determine that the UE is traveling toward the base station. If the base station measures a negative Doppler shift, the base station can determine that the UE is traveling away from the base station. If the base station measures no Doppler shift (or almost no Doppler shift), the base station can determine that the UE is not moving, or is traveling on a path that is approximately orthogonal to the direct path between the base station and the UE. If the base station measures a series of positive Doppler shifts that are decreasing (e.g., decreasing exponentially), the base station can determine a prediction that the UE will soon observe a sharp change in Doppler shift (e.g., when the UE passes by the base station).

[0102] The base station can use the measurement of Doppler shift along with the direction of the beam used to communicate with the UE to determine the direction in which the UE is traveling. Using the direction in which the UE is traveling, the base station can identify additional base stations ahead on the HSTT path, additional base stations behind on the HSTT path, beams that are likely to provide better connectivity than the current beam based at least in part on the direction in which the UE is traveling, etc.

[0103] As indicated by reference numeral 630, the base station may determine the location of the UE. The base station may determine the location of the UE based at least in part on signaling from the UE, based at least in part on a beam sweeping process, information from another base station or another device on the network, etc. Figure 5 As discussed, the location of the UE may include the geographic coordinates of the UE, the relative positioning relative to the base station (e.g., the distance between the UE and the base station), etc. The location of the UE may indicate the location of the UE along the HSTT path. Additionally or alternatively, the base station may use the location of the UE together with the measurement of the Doppler shift to determine the direction of the UE along the HSTT path, identify the base station as a front base station, identify the base station as a rear base station, etc.

[0104] As indicated by reference numeral 640, the base station may determine that an HSTT event has occurred. In some aspects, the base station may determine that an HSTT event has occurred based at least in part on satisfying a Doppler shift threshold, satisfying an angle change threshold, and / or the location of the UE. The occurrence of HSTT may indicate that the base station expects an upcoming change in Doppler shift (e.g., a change that satisfies a threshold), that there has been a change in Doppler shift, that the base station expects an upcoming change in angle change (e.g., a change that satisfies a threshold), that there has been a change in angle change, that the UE is located at a location associated with an HSTT environment, etc.

[0105] As indicated by reference numeral 650, the base station may provide configuration information to the UE. In some aspects, the base station may provide the configuration within a DCI communication, an RRC communication, a MAC CE communication, or the like.

[0106] As indicated by reference numeral 660, the UE may configure the UE based at least in part on the configuration information. As described above, the UE may use the configuration information to configure the UE to communicate with the second base station and / or switch beams. In some aspects, the UE may configure the UE to change a communication state (e.g., from an idle mode to a connected mode) based at least in part on the configuration information.

[0107] As discussed above, the UE may be in idle mode. The base station may determine that a HSTT event has occurred for the UE. For example, the base station may measure the Doppler shift and / or angle change of the wireless signal, the location of the UE, etc. to determine that a HSTT event has occurred for the UE. In some aspects, the base station may determine that a HSTT event has occurred based at least in part on a base station serving the UE in the HSTT environment (e.g., the UE is in a HSTT environment). In some aspects, the positioning information of the UE may be synchronized with the base station (e.g., via direct or indirect wireless communication).

[0108] The base station may provide configuration information to the UE to change the connection state of the UE from the idle mode to the connected mode. Once in the connected mode, the UE may perform one or more procedures described herein to maintain a continuous connection with the network.

[0109] As indicated above, Figure 6 are provided as examples. Other examples may differ from those described herein. Figure 6 Examples described.

[0110] Figure 7 is a diagram illustrating an example 700 of user equipment in a high-speed train or tunnel environment in accordance with various aspects of the present disclosure. Figure 7 A UE 702, base stations 704, 706, and 708, and a HSTT path 710 are shown at various locations along a path in a high speed train or tunnel (HSTT) environment.

[0111] As shown, UE 702 is connected to base station 704 to communicate with the network. According to various aspects of the present disclosure, UE 702 can determine that a HSTT event has occurred (e.g., one or more measurements of Doppler shift and / or angle change indicate an upcoming change in expected Doppler shift and / or angle change). For example, when UE 702 approaches base station 704, the Doppler shift can decrease in the direction of no Doppler shift, and when UE 703 moves quickly between beams used to communicate with base station 704, the angle change can increase.

[0112] UE 702 may provide an indication of a HSTT event to base station 704 before traveling to a location that may be too close to base station 704 to maintain a continuous connection with the network via base station 704. As discussed herein, base station 704 may determine configuration information to provide to UE 702 and provide the configuration information to UE 702.

[0113] In some aspects, the configuration information may identify a base station or beam to be used for communicating with the network. For example, the configuration information may indicate that the UE 702 should communicate with the base station 706 (the forward base station) ahead on the HSTT path 710. Switching from the base station 704 to the base station 706 may allow the UE 702 to communicate with the network without a dramatic change in Doppler shift and / or angle variation as if the UE continued to communicate with the base station 704.

[0114] In some aspects, UE 702 may be unable to communicate with a base station ahead on HSTT path 710 (e.g., based at least in part on an obstacle, such as a wall). In this case, base station 704 may provide configuration information to UE 702 to communicate with base station 708 behind on HSTT path 710 (rear base station).

[0115] In some aspects, after the UE 702 switches to communicate with the base station 706 or 708, the UE may be configured (e.g., based at least in part on the configuration information or the new configuration information) to switch back to communicate with the base station 704. In some aspects, after passing by the base station 704, the UE 702 may be able to communicate with the base station 704 without an expected upcoming increase in Doppler shift or angle change that may prevent the UE 102 from maintaining a continuous connection. For example, if the UE 702 is configured to communicate with the base station 708 when the UE 702 passes by the base station 704, the UE 702 may be configured to switch back to communicate with the base station 704 based at least in part on the base station 704 being the closest base station to the UE 702 and / or based at least in part on having the strongest signal for the UE 702.

[0116] In some aspects, if UE 702 is configured to communicate with base station 706 or 708, and UE 702 is unable to communicate with base station 706 or 708 (e.g., if signal strength is low, if Doppler shift is too large, etc.), UE 702 may switch back to communicating with base station 704.

[0117] Figure 8 8 is a diagram illustrating an example process 800, performed, for example, by a UE, in accordance with various aspects of the present disclosure. Example process 800 is an example in which a UE (eg, UE 120, etc.) performs operations associated with maintaining a persistent connection for a single frequency network.

[0118] As in Figure 8 8, in some aspects, process 800 may include determining a measurement of a wireless signal from a first base station of a network, the measurement including one or more of the following: a Doppler shift of the wireless signal, or an angular change of the wireless signal (block 810). For example, the UE (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, etc.) may determine a measurement of a wireless signal from a first base station of a network, the measurement including one or more of the following: a Doppler shift of the wireless signal, or an angular change of the wireless signal, as described above.

[0119] like Figure 8 As further shown in FIG. 8 , in some aspects, process 800 may include determining that a high speed train or tunnel (HSTT) event has occurred based at least in part on one or more of the following: a Doppler shift satisfies a Doppler shift threshold, or an angle change satisfies an angle change threshold (block 820). For example, the UE (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, etc.) may determine that a HSTT event has occurred based at least in part on one or more of the following: a Doppler shift satisfies a Doppler shift threshold, or an angle change satisfies an angle change threshold, as described above.

[0120] like Figure 8 As further shown in FIG. 8 , in some aspects, process 800 may include providing an indication to the first base station that an HSTT event has occurred (block 830). For example, the UE (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, etc.) may provide an indication to the first base station that an HSTT event has occurred, as described above.

[0121] like Figure 8 As further shown in FIG. 8 , in some aspects, process 800 may include receiving configuration information from a first base station to configure the UE to switch to a second base station of the network based at least in part on a HSTT event, configure the UE to perform beam switching based at least in part on a HSTT event, or cause the UE to change a connection state based at least in part on a HSTT event (block 840). For example, the UE (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, etc.) may receive configuration information from a first base station to configure the UE to switch to a second base station of the network based at least in part on a HSTT event, configure the UE to perform beam switching based at least in part on a HSTT event, or cause the UE to change a connection state based at least in part on a HSTT event, as described above.

[0122] Process 800 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0123] In a first aspect, process 800 includes configuring a UE based at least in part on configuration information.

[0124] In a second aspect, alone or in combination with the first aspect, process 800 includes determining a location of the UE, wherein determining that a HSTT event has occurred is further based at least in part on the location of the UE.

[0125] In a third aspect, alone or in combination with one or more of the first and second aspects, determining the location of the UE includes measuring location information by a component of the UE.

[0126] In a fourth aspect, alone or in combination with one or more of the first to third aspects, determining the location of the UE includes receiving location information from the first base station.

[0127] In a fifth aspect, either alone or in combination with one or more of the first to fourth aspects, receiving the location information comprises receiving the location information via one or more of radio resource control communications, downlink control information communications, or media access control-control element communications.

[0128] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, determining the location of the UE includes determining a distance from the UE to the first base station.

[0129] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, a HSTT event indicates an expected upcoming change in Doppler shift.

[0130] In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, a HSTT event indicates that there has been a change in Doppler shift.

[0131] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, the indication that a HSTT event has occurred comprises one or more of an indication of a measurement or an indication of a UE location.

[0132] In a tenth aspect, alone or in combination with one or more of the first to ninth aspects, the Doppler shift threshold is based at least in part on an ability of the UE to accept frequency changes based at least in part on the Doppler shift.

[0133] In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, the angle change threshold is based at least in part on a beam switching capability of the UE.

[0134] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the configuration information includes an identification of a second base station of the network for handover.

[0135] In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the configuration information includes an identification of a beam for beam switching.

[0136] In the fourteenth aspect, alone or in combination with one or more of the first to thirteenth aspects, receiving the configuration information includes receiving the configuration information via one or more of radio resource control communication, downlink control information communication, media access control-control element communication, physical broadcast channel communication or physical downlink control channel communication.

[0137] In a fifteenth aspect, alone or in combination with one or more of the first to fourteenth aspects, the UE is in an idle mode, and the configuration information causes the UE to change to a connected mode.

[0138] although Figure 8 An example block diagram of process 800 is shown, but in some aspects, process 800 may include Figure 8 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 800. Additionally or alternatively, two or more blocks of process 800 may be executed in parallel.

[0139] Fig. 9 is a diagram illustrating an example process 900, performed, for example, by a first base station, in accordance with various aspects of the present disclosure. Example process 900 is an example in which a first base station (eg, base station 110, etc.) performs operations associated with maintaining a persistent connection for a single frequency network.

[0140] As in Fig. 9 , in some aspects, process 900 may include receiving an indication from a UE that an HSTT event has occurred (block 910). For example, the first base station (e.g., using receive processor 238, transmit processor 220, controller / processor 240, memory 242, etc.) may receive an indication from a UE that an HSTT event has occurred, as described above.

[0141] like Fig. 9As further shown in FIG. 9 , in some aspects, process 900 may include providing configuration information to the UE to configure the UE to switch to a second base station of the network based at least in part on the HSTT event, configure the UE to perform beam switching based at least in part on the HSTT event, or cause the UE to change the connection state based at least in part on the HSTT event (block 920). For example, the first base station (e.g., using receive processor 238, transmit processor 220, controller / processor 240, memory 242, etc.) may provide configuration information to the UE to configure the UE to switch to a second base station of the network based at least in part on the HSTT event, configure the UE to perform beam switching based at least in part on the HSTT event, or cause the UE to change the connection state based at least in part on the HSTT event, as described above.

[0142] Process 900 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0143] In a first aspect, process 900 includes determining a location of a UE and determining configuration information based at least in part on the location of the UE.

[0144] In a second aspect, alone or in combination with the first aspect, determining the location of the UE includes measuring location information by a component of the first base station.

[0145] In a third aspect, alone or in combination with one or more of the first and second aspects, determining the location of the UE includes receiving location information from the UE.

[0146] In a fourth aspect, alone or in combination with one or more of the first to third aspects, determining the location of the UE includes determining a distance from the UE to the first base station.

[0147] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, a HSTT event indicates an expected upcoming change in Doppler frequency shift for communicating with the UE.

[0148] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, a HSTT event indicates a change in Doppler frequency shift that has occurred in communicating with the UE.

[0149] In a seventh aspect, either alone or in combination with one or more of the first to sixth aspects, the indication that an HSTT event has occurred comprises one or more of the following: an indication of a measurement by the UE of a wireless signal from a first base station, the measurement comprising one or more of a Doppler frequency shift of the wireless signal or an angular change of the wireless signal; or an indication of the UE's position.

[0150] In the eighth aspect, either alone or in combination with one or more of the first to seventh aspects, the indication that an HSTT event has occurred indicates one or more of the following: a Doppler shift measurement performed by the UE on a wireless signal provided by the first base station satisfies a Doppler shift threshold, or an angle change measurement performed by the UE on a wireless signal provided by the first base station satisfies an angle change threshold.

[0151] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, the configuration information includes an identification of a second base station of the network for handover.

[0152] In a tenth aspect, alone or in combination with one or more of the first to ninth aspects, the configuration information includes an identification of a beam for beam switching.

[0153] In the eleventh aspect, either alone or in combination with one or more of the first to tenth aspects, providing configuration information includes providing configuration information via one or more of radio resource control communications, downlink control information communications, media access control-control element communications, physical broadcast channel communications, or physical downlink control channel communications.

[0154] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the UE is in an idle mode.

[0155] In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, process 900 includes receiving a random access channel communication from a UE requesting a change to a connected mode.

[0156] although Fig. 9 An example block diagram of process 900 is shown, but in some aspects, process 900 may include Fig. 9 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 900. Additionally or alternatively, two or more blocks of the process 900 may be executed in parallel.

[0157] Fig.10 is a diagram illustrating an example process 1000 of, for example, a first base station in accordance with various aspects of the present disclosure. Example process 900 is an example in which a first base station (eg, base station 110, etc.) performs operations associated with maintaining a persistent connection of a single frequency network.

[0158] As in Fig.101000, in some aspects, process 1000 may include determining that an HSTT event has occurred based at least in part on one or more of: a Doppler shift measurement of a wireless signal provided by a UE satisfying a Doppler shift threshold, an angle change measurement of a wireless signal provided by a UE satisfying an angle change threshold, or a location of the UE (block 1010). For example, the first base station (e.g., using receive processor 238, transmit processor 220, controller / processor 240, memory 242, etc.) may determine that an HSTT event has occurred based at least in part on one or more of: a Doppler shift measurement of a wireless signal provided by a UE satisfying a Doppler shift threshold, an angle change measurement of a wireless signal provided by a UE satisfying an angle change threshold, or a location of the UE, as described above.

[0159] like Fig.10 As further shown in FIG. 1 , in some aspects, process 1000 may include providing configuration information to the UE to configure the UE to switch to a second base station of the network based at least in part on the HSTT event, configure the UE to perform beam switching based at least in part on the HSTT event, or cause the UE to change the connection state based at least in part on the HSTT event (block 1020). For example, the first base station (e.g., using receive processor 238, transmit processor 220, controller / processor 240, memory 242, etc.) may provide configuration information to the UE to configure the UE to switch to a second base station of the network based at least in part on the HSTT event, configure the UE to perform beam switching based at least in part on the HSTT event, or cause the UE to change the connection state based at least in part on the HSTT event, as described above.

[0160] Process 1000 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0161] In a first aspect, process 1000 includes determining a location of a UE and determining configuration information based at least in part on the location of the UE.

[0162] In a second aspect, alone or in combination with the first aspect, process 1000 includes determining a location of a UE by measuring location information by a component of a first base station.

[0163] In a third aspect, alone or in combination with one or more of the first and second aspects, process 1000 includes determining a location of a UE by receiving location information from the UE.

[0164] In a fourth aspect, alone or in combination with one or more of the first to third aspects, the position of the UE comprises a position relative to the first base station.

[0165] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, a HSTT event indicates an expected upcoming change in Doppler shift.

[0166] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, a HSTT event indicates that there has been a change in Doppler shift.

[0167] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, the configuration information includes an identification of a second base station of the network for handover.

[0168] In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, process 1000 includes determining that the UE is moving away from the second base station.

[0169] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, process 1000 includes determining that the UE is moving towards a second base station.

[0170] In a tenth aspect, alone or in combination with one or more of the first to ninth aspects, the configuration information includes an identification of a beam for beam switching.

[0171] In the eleventh aspect, either alone or in combination with one or more of the first to tenth aspects, providing configuration information includes providing configuration information via one or more of radio resource control communications, downlink control information communications, media access control-control element communications, physical broadcast channel communications, or physical downlink control channel communications.

[0172] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the UE is in an idle mode, and the configuration information is to cause the UE to change to a connected mode.

[0173] In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the process 1000 includes receiving a random access channel communication from a UE requesting a change to a connected mode.

[0174] although Fig.10 An example block diagram of process 1000 is shown, but in some aspects, process 1000 may include Fig.10 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 1000. Additionally or alternatively, two or more blocks of the process 1000 may be executed in parallel.

[0175] 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.

[0176] 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 herein, a processor is implemented with hardware, firmware, and / or a combination of hardware and software.

[0177] As used herein, satisfying a threshold may refer to a value being 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.

[0178] It will be apparent that the systems and / or methods described herein can be implemented in different 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 various aspects. Thus, the operation and behavior of these systems and / or methods are described herein without reference to specific software codes-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.

[0179] 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 not specifically described in the claims and / or not disclosed in the specification. Although each dependent claim 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 quoting "at least one of" a column of items refers to any combination of these items, including a single member. 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 (for example, aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other sorting of a, b and c).

[0180] Elements, actions or instructions used herein should not be interpreted as critical or necessary unless explicitly described as such. Moreover, as used herein, 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 herein, 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 herein, the terms "having", "containing", "including", etc. are intended to be open terms. In addition, the phrase "based at least in part on" is intended to mean "based at least in part on", unless otherwise explicitly stated.

Claims

1. A wireless communication method performed by a user equipment (UE), comprising: determining a measurement of a wireless signal from a first network node of a network, the measurement comprising an angular change of the wireless signal; determining that a high speed train or tunnel (HSTT) event has occurred based at least in part on the angle change being greater than or equal to an angle change threshold; providing an indication that said HSTT event has occurred; as well as Configuration information is received to configure the UE for beam switching based at least in part on the HSTT event.

2. The method of claim 1, further comprising: The UE is configured based at least in part on the configuration information.

3. The method of claim 1, further comprising: determining a location of the UE, Wherein determining that the HSTT event has occurred is further based at least in part on a location of the UE.

4. The method of claim 3, wherein determining the location of the UE comprises: Location information is measured by a component of the UE.

5. The method of claim 3, wherein determining the location of the UE comprises: Receive location information.

6. The method of claim 5, wherein receiving the location information comprises: The location information is received via one or more of the following: Radio Resource Control Communications, Downlink control information communication, or Media Access Control - Control element communications.

7. The method of claim 3, wherein determining the location of the UE comprises: A distance from the UE to the first network node is determined.

8. The method of claim 1 , wherein the indication that the HSTT event has occurred comprises one or more of: an indication of said measurement, or An indication of the location of the UE.

9. The method of claim 1, wherein the angle change threshold is based at least in part on a beam switching capability of the UE.

10. The method of claim 1, wherein the configuration information includes an identification of a beam used for the beam switching.

11. The method of claim 1 , wherein receiving the configuration information comprises: The configuration information is received via one or more of the following: Radio Resource Control Communications, Downlink control information communication, Media Access Control - Control Element Communications, Physical broadcast channel communication, or Physical Downlink Control Channel Communications.

12. A wireless communication method performed by a first network node of a network, comprising: receiving an indication that a high speed train or tunnel (HSTT) event has occurred, wherein the indication that the HSTT event has occurred indicates that an angle change measurement made by a user equipment (UE) of a wireless signal provided by the first network node is greater than or equal to an angle change threshold; as well as Configuration information is provided to configure the UE to perform beam switching based at least in part on the HSTT event.

13. The method of claim 12, further comprising: Determining a location of the UE; as well as The configuration information is determined based at least in part on a location of the UE.

14. The method of claim 13, wherein determining the location of the UE comprises: Position information is measured by a component of the first network node.

15. The method of claim 13, wherein determining the location of the UE comprises: Receive location information.

16. The method of claim 13, wherein determining the location of the UE comprises: A distance from the UE to the first network node is determined.

17. The method of claim 12, wherein the indication that the HSTT event has occurred comprises one or more of: an indication of a measurement by the UE of a radio signal from the first network node, the measurement comprising an angular change of the radio signal; or An indication of the location of the UE.

18. The method of claim 12, wherein the configuration information includes an identification of a beam used for the beam switching.

19. The method of claim 12, wherein providing the configuration information comprises: The configuration information is provided via one or more of the following: Radio Resource Control Communications, Downlink control information communication, Media Access Control - Control Element Communications, Physical broadcast channel communication, or Physical Downlink Control Channel Communications.

20. A wireless communication method performed by a first network node of a network, comprising: determining that a high speed train or tunnel (HSTT) event has occurred based at least in part on an angle change measurement made by the first network node on a wireless signal provided by a user equipment (UE) being greater than or equal to an angle change threshold; as well as Configuration information is provided to configure the UE for beam switching based at least in part on the HSTT event.

21. The method of claim 20, further comprising: Determining a location of the UE; as well as The configuration information is determined based at least in part on a location of the UE.

22. The method of claim 20, further comprising: The location of the UE is determined by measuring location information by a component of the first network node.

23. The method of claim 20, further comprising: The location of the UE is determined by receiving location information.

24. The method of claim 20, wherein the location of the UE comprises a location relative to the first network node.

25. The method of claim 20, wherein the configuration information includes an identification of a beam used for the beam switching.

26. The method of claim 20, wherein providing the configuration information comprises: The configuration information is provided via one or more of the following: Radio Resource Control Communications, Downlink control information communication, Media Access Control - Control Element Communications, Physical broadcast channel communication, or Physical Downlink Control Channel Communications.

27. A user equipment (UE) for wireless communication, comprising: Memory; as well as One or more processors operatively coupled to the memory, the memory and the one or more processors being configured to: determining a measurement of a wireless signal from a first network node of a network, the measurement comprising an angular change of the wireless signal; determining that a high speed train or tunnel (HSTT) event has occurred based at least in part on the angle change being greater than or equal to an angle change threshold; providing an indication that said HSTT event has occurred; as well as Configuration information is received to configure the UE for beam switching based at least in part on the HSTT event.

28. The UE of claim 27, wherein the memory and the one or more processors are further configured to: The UE is configured based at least in part on the configuration information.

29. The UE of claim 27, wherein the memory and the one or more processors are further configured to: determining a location of the UE, Wherein determining that the HSTT event has occurred is further based at least in part on a location of the UE.

30. The UE of claim 29, wherein determining the location of the UE comprises: Location information is measured by a component of the UE.

31. The UE of claim 29, wherein determining the location of the UE comprises: Receive location information.

32. The UE of claim 31 , wherein receiving the location information comprises: The location information is received via one or more of the following: Radio Resource Control Communications, Downlink control information communication, or Media Access Control - Control element communications.

33. The UE of claim 29, wherein determining the location of the UE comprises: A distance from the UE to the first network node is determined.

34. The UE of claim 27, wherein the indication that the HSTT event has occurred comprises one or more of: an indication of said measurement, or An indication of the location of the UE.

35. The UE of claim 27, wherein the angle change threshold is based at least in part on a beam switching capability of the UE.

36. The UE of claim 27, wherein the configuration information includes an identification of a beam used for the beam switching.

37. The UE of claim 27, wherein receiving the configuration information comprises: The configuration information is received via one or more of the following: Radio Resource Control Communications, Downlink control information communication, Media Access Control - Control Element Communications, Physical broadcast channel communication, or Physical Downlink Control Channel Communications.

38. A first network node of a network for wireless communication, comprising: Memory; as well as One or more processors operatively coupled to the memory, the memory and the one or more processors being configured to: receiving an indication that a high speed train or tunnel (HSTT) event has occurred, wherein the indication that the HSTT event has occurred indicates that an angle change measurement made by a user equipment (UE) of a wireless signal provided by the first network node is greater than or equal to an angle change threshold; as well as Configuration information is provided to configure the UE for beam switching based at least in part on the HSTT event.

39. The first network node of claim 38, the memory and the one or more processors being further configured to: determining a location of the UE; and The configuration information is determined based at least in part on a location of the UE.

40. The first network node of claim 39, wherein determining the location of the UE comprises: Position information is measured by a component of the first network node.

41. The first network node of claim 39, wherein determining the location of the UE comprises: Receive location information.

42. The first network node of claim 39, wherein determining the location of the UE comprises: A distance from the UE to the first network node is determined.

43. The first network node of claim 38, wherein the indication that the HSTT event has occurred comprises one or more of: an indication of a measurement by the UE of a radio signal from the first network node, the measurement comprising an angular change of the radio signal; or An indication of the location of the UE.

44. The first network node of claim 38, wherein the configuration information comprises an identification of a beam used for the beam switching.

45. The first network node of claim 38, wherein providing the configuration information comprises: The configuration information is provided via one or more of the following: Radio Resource Control Communications, Downlink control information communication, Media Access Control - Control Element Communications, Physical broadcast channel communication, or Physical Downlink Control Channel Communications.

46. ​​A first network node of a network for wireless communication, comprising: Memory; as well as One or more processors operatively coupled to the memory, the memory and the one or more processors being configured to: determining that a high speed train or tunnel (HSTT) event has occurred based at least in part on an angle change measurement made by the first network node on a wireless signal provided by a user equipment (UE) being greater than or equal to an angle change threshold; as well as Configuration information is provided to configure the UE for beam switching based at least in part on the HSTT event.

47. The first network node of claim 46, the memory and the one or more processors being further configured to: determining a location of the UE; and The configuration information is determined based at least in part on a location of the UE.

48. The first network node of claim 46, the memory and the one or more processors being further configured to: The location of the UE is determined by measuring location information by a component of the first network node.

49. The first network node of claim 46, the memory and the one or more processors being further configured to: The location of the UE is determined by receiving location information.

50. The first network node of claim 46, wherein the location of the UE comprises a location relative to the first network node.

51. The first network node of claim 46, wherein the configuration information comprises an identification of a beam used for the beam switching.

52. The first network node of claim 46, wherein providing the configuration information comprises: The configuration information is provided via one or more of the following: Radio Resource Control Communications, Downlink control information communication, Media Access Control - Control Element Communications, Physical broadcast channel communication, or Physical Downlink Control Channel Communications.

53. A non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions comprising: One or more instructions that, when executed by one or more processors of a user equipment (UE), cause the one or more processors to: determining a measurement of a wireless signal from a first network node of a network, the measurement comprising an angular change of the wireless signal; determining that a high speed train or tunnel (HSTT) event has occurred based at least in part on the angle change being greater than or equal to an angle change threshold; providing an indication that said HSTT event has occurred; as well as Configuration information is received to configure the UE for beam switching based at least in part on the HSTT event.

54. A non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions comprising: One or more instructions that when executed by one or more processors of a first network node of a network cause the one or more processors to: receiving an indication that a high speed train or tunnel (HSTT) event has occurred, wherein the indication that the HSTT event has occurred indicates that an angle change measurement made by a user equipment (UE) of a wireless signal provided by the first network node is greater than or equal to an angle change threshold; as well as Configuration information is provided to configure the UE for beam switching based at least in part on the HSTT event.

55. A non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions comprising: One or more instructions that when executed by one or more processors of a first network node of a network cause the one or more processors to: determining that a high speed train or tunnel (HSTT) event has occurred based at least in part on an angle change measurement made by the first network node on a wireless signal provided by a user equipment (UE) being greater than or equal to an angle change threshold; as well as Configuration information is provided to configure the UE for beam switching based at least in part on the HSTT event.

56. A device for wireless communication, comprising: means for determining a measurement of a wireless signal from a first network node of a network, the measurement comprising an angular change of the wireless signal; means for determining that a high speed train or tunnel (HSTT) event has occurred based at least in part on the angle change being greater than or equal to an angle change threshold; means for providing an indication that said HSTT event has occurred; as well as Means for receiving configuration information to configure the device for beam switching based at least in part on the HSTT event.

57. A device for wireless communication, comprising: means for receiving an indication that a high speed train or tunnel (HSTT) event has occurred, wherein the indication that the HSTT event has occurred indicates that an angle change measurement made by a user equipment (UE) of a wireless signal provided by the device is greater than or equal to an angle change threshold; as well as Means for providing configuration information to configure the UE for beam switching based at least in part on the HSTT event.

58. A device for wireless communication, comprising: means for determining that a high speed train or tunnel (HSTT) event has occurred based at least in part on an angle change measurement made by the device of a wireless signal provided by a user equipment (UE) being greater than or equal to an angle change threshold; as well as Means for providing configuration information to configure the UE for beam switching based at least in part on the HSTT event.

Images