High-speed movement configuration and default beam technology

Abstract

The base station (102) may establish a cellular link with a user equipment (UE) (106) according to a single frequency network scheme. The base station (102) may then determine one or more control resource set (CORESET) transmission configuration indication (TCI) states and transmit signaling to configure the UE (106) with the one or more CORESET TCI states. Additionally or alternatively, the one or more CORESET TCI states may be usable by the UE (106) in performing communications with at least one of a first transmission reception point (TRP) and a second TRP associated with the cellular link with the cellular network (100).

Description

[Technical Field]

[0001] The present application relates to wireless devices, and more particularly to apparatus, systems, and methods for configuration and default beam techniques in high speed single frequency network scenarios in wireless communication systems. [Background technology]

[0002] The use of wireless communication systems is growing rapidly. In recent years, wireless devices such as smartphones and tablet computers have become increasingly sophisticated. In addition to supporting telephony functions, many mobile devices now provide Internet access, email, text messaging, and navigation using the global positioning system (GPS), and can run sophisticated applications that take advantage of these functionalities. In addition, many different wireless communication technologies and standards exist. Some examples of wireless communication standards include GSM, UMTS (e.g., relating to WCDMA or TD-SCDMA air interfaces), LTE, LTE Advanced (LTE-A), HSPA, 3GPP2 CDMA2000 (e.g., 1xRTT, 1xEV-DO, HRPD, eHRPD), IEEE 802.11 (WLAN or Wi-Fi), BLUETOOTH™, and the like.

[0003] The ever-increasing number of features and functions introduced into wireless communication devices creates a continuous need to improve both wireless communication and wireless communication devices. In particular, it is important to ensure the accuracy of signals transmitted and received via wireless devices used in wireless cellular communications. In addition, increasing the functionality of UE devices can place a significant strain on the battery life of the UE devices. Therefore, it is also very important to reduce the power requirements of UE devices while enabling the UE devices to maintain good transmission and reception capabilities to improve communications.

[0004] Furthermore, wireless devices are used in an increasing range of contexts. For example, wireless devices may be used at a variety of speeds of movement, ranging from relatively stationary or slow speeds (e.g., devices at fixed locations or carried by pedestrians) to very high speeds (e.g., high-speed trains (HST), etc.). Different technologies and features may, at least in some cases, provide better performance under different such conditions. Therefore, improvements in this area are desirable. Summary of the Invention

[0005] Embodiments relate to apparatus, systems, and methods for configuration and default beam technology in high speed single frequency network scenarios in wireless communication systems.

[0006] In some embodiments, a base station may establish a cellular link with a user equipment (UE) according to a single frequency network scheme. The base station may then determine one or more control resource set (CORESET) transmission configuration indication (TCI) states and transmit signaling to configure the UE with the one or more CORESET TCI states. Additionally or alternatively, the one or more CORESET TCI states may be usable by the UE when performing communications with at least one of a first transmission reception point (TRP) and a second TRP associated with the cellular link with the cellular network.

[0007] According to some embodiments, the signaling may include media access control-control element (MAC-CE) signaling. Additionally or alternatively, one or more CORESET TCI states may be included in an active bandwidth portion (BWP) of a component carrier (CC). In some embodiments, the one or more CORESET TCI states may be associated with a UE-specific search space (USS) or a common search space (CSS) and / or configured in different search spaces. Additionally or alternatively, the CSS may include at least one of a Type 0-Physical Downlink Control Channel (PDCCH) CSS set for System Information Broadcast 1 (SIB1) monitoring, a Type 0 A-PDCCH CSS set for System Information (SI) monitoring, a Type 1-PDCCH CSS set for Random Access Channel (RACH) monitoring, a Type 2-PDCCH CSS set for paging monitoring, and / or a Type 3-PDCCH CSS set for special Downlink Control Information (DCI) 2_x monitoring.

[0008] In some embodiments, a UE may establish a cellular link with a base station (BS) according to a single-frequency network scheme. The UE may transmit first signaling to the BS, the first signaling including measurement information corresponding to at least a first transmit reception point (TRP) and a second TRP associated with the cellular link with the cellular network. The UE may receive second signaling from the BS, the second signaling including an indication of one or more control resource set (CORESET) transmission configuration indicator (TCI) state configurations. Accordingly, the UE may select one or more default beams based on the received one or more CORESET TCI state configurations, and further perform communication with at least one of the first TRP and the second TRP using the one or more default beams.

[0009] According to some embodiments, the communications performed using one or more default beams may correspond to at least one of the physical downlink shared channels (PDSCHs). Additionally or alternatively, a timing offset between the received downlink control information (DCI) indicating one or more TCI states for the PDSCH and the corresponding PDSCH may be less than a parameter timeDurationForQCL.

[0010] According to further embodiments, one or more default beams may be selected according to a TCI codepoint with the lowest index that includes two TCI states, a CORESET that is configured with one or more TCI states and has the lowest identifier (ID) in the last slot monitored by the UE on the physical downlink control channel (PDDCH), a TCI codepoint with the lowest index that includes one TCI state, or a CORESET that is configured with one or more TCI states and has the lowest and second-lowest IDs in the last slot monitored by the UE on the physical downlink control channel (PDCCH).

[0011] In some embodiments, the measurement information may include Doppler shift measurement information. Additionally or alternatively, the Single Frequency Network (SFN) may be configured to support at least one of one or more Physical Downlink Control Channels (PDCCHs) and one or more Physical Downlink Shared Channels (PDSCHs). According to some embodiments, a timing offset between a received DCI that schedules a PDSCH and indicates a TCI status for the scheduled PDSCH and the corresponding PDSCH may be greater than or equal to a parameter timeDurationForQCL.

[0012] According to some embodiments, communications performed using one or more default beams may correspond to at least one of one or more aperiodic channel state information reference signals (AP-CSI-RS). Additionally or alternatively, a timing offset between a received DCI that triggers an AP-CSI-RS and the corresponding AP-CSI-RS may be less than the parameter beamSwitchTiming. In some embodiments, the UE may be configured to select one or more CORESET TCI state configurations based on the UE implementation. Additionally or alternatively, the UE may be configured to transmit signaling to the BS that includes an indication of one or more TCIs or default beam capabilities of the UE.

[0013] The techniques described herein may be implemented in and / or used in conjunction with several different types of devices, including, but not limited to, cellular telephones, tablet computers, wearable computing devices, portable media players, and any of a variety of other computing devices.

[0014] This Summary is intended to provide a brief overview of some of the subject matter described in this document. Accordingly, it should be understood that the above features are merely examples and should not be construed as narrowing the scope or spirit of the subject matter described herein. Other features, aspects, and advantages of the subject matter described herein will become apparent from the following Detailed Description, the drawings, and the claims.

[0015] A better understanding of the present subject matter may be obtained from the following detailed description of various embodiments when considered in conjunction with the following drawings. [Brief explanation of the drawings]

[0016] [Figure 1] 1 illustrates an exemplary wireless communication system according to some embodiments.

[0017] [Figure 2]1 illustrates a base station (BS) in communication with a user equipment (UE) device, according to some embodiments.

[0018] [Figure 3] 1 is an example block diagram of a UE according to some embodiments.

[0019] [Figure 4] 1 is an exemplary block diagram of a BS according to some embodiments.

[0020] [Figure 5] 1 illustrates an exemplary block diagram of a cellular communication circuit according to some embodiments.

[0021] [Figure 6A] 1 illustrates an example of a connection between an EPC network, an LTE base station (eNB), and a 5G NR base station (gNB), according to some embodiments.

[0022] [Figure 6B] 1 illustrates example protocol stacks for an eNB and a gNB, according to some embodiments.

[0023] [Figure 7] FIG. 1 is a flow chart diagram illustrating an example method for establishing a control resource set (CORESET) transmission configuration indicator (TCI) configuration for a high-speed train single frequency network (HST-SFN) scenario, according to some embodiments.

[0024] [Figure 8] FIG. 1 is a flow chart diagram illustrating an example method for determining a default beam for a physical downlink shared channel (PDSCH) or an aperiodic channel state information reference signal (AP-CSI-RS) in an HST-SFN scenario, according to some embodiments.

[0025] While the features described herein are susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and are herein described in detail. It should be understood, however, that the drawings and detailed description are not intended to limit the invention to the particular forms disclosed, but rather to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present subject matter as defined by the appended claims. DETAILED DESCRIPTION OF THE INVENTION

[0026] acronym

[0027] Various acronyms are used throughout this disclosure. Definitions of the most prominently used acronyms that may appear throughout this disclosure are provided below. ●3GPP: Third Generation Partnership Project ●TS: Technical specifications RAN: Radio Access Network ●RAT: Radio Access Technology ●UE: User Equipment ●RF: Radio frequency ●BS: Base station DL: Downlink ●UL: Uplink ●LTE: Long Term Evolution ●NR: New Radio ●5GS: 5G system ●5GMM: 5GS mobility management ●5GC: 5G Core Network ●IE: Information Element ●RRC: Radio Resource Control ●HST: High-speed train ●SFN: Single Frequency Network ●TRP: Transmitting / receiving point MAC-CE: Media Access Control - Control Element ●TCI: Transmission Configuration Indicator ●CORESET: Control resource set ●CSI-RS: Channel State Information Reference Signal ●CC: Component Carrier RACH: Random Access Channel ●RLC: Radio Link Control ●NW: Network ●UE: User Equipment ●SI: System Information ●SIB1: System Information Block-1 ●SSB: Synchronization signal block PDCCH: Physical Downlink Control Channel ●PUSCH: Physical uplink shared channel ●BWP: Bandwidth part ●RB: Resource Block ●USS:UE specific search space ●CSS: Common search space DCI: Downlink control information ID: Identifier ●QCL: Quasi-collocation or pseudo-colocation ●CSI: Channel State Information ●CQI: Channel Quality Indicator ●PMI: Precoding Matrix Indicator ●RI: Rank Indicator term

[0028] The following is a description of terms used in this disclosure:

[0029] Memory medium—any of various types of non-transitory memory or storage devices. The term “memory medium” is intended to include, for example, installation media such as CD-ROMs, floppy disks, or tape drives; computer system memory or random access memory such as DRAM, DDR RAM, SRAM, EDO RAM, Rambus RAM; magnetic media such as flash, hard drives, or non-volatile memory such as optical storage; registers, or other similar types of memory elements. Memory media may also include other types of non-transitory memory, or combinations thereof. Additionally, memory media may be located in a first computer system on which a program is executed, or may be located in a second, different computer system connected to the first computer system via a network such as the Internet. In the latter case, the second computer system can provide program instructions to the first computer for execution. The term “memory medium” may also include two or more memory media that can reside in different locations, for example, in different computer systems connected via a network. A memory medium may store program instructions (e.g., embodied as a computer program) that can be executed by one or more processors.

[0030] Carrier Medium - memory media as described above, as well as physical transmission media such as buses, networks, and / or other physical transmission media that carry signals, such as electrical, electromagnetic, or digital signals.

[0031] Programmable Hardware Element—includes a variety of hardware devices with multiple programmable function blocks connected via programmable interconnects. Examples include Field Programmable Gate Arrays (FPGAs), Programmable Logic Devices (PLDs), Field Programmable Object Arrays (FPOAs), and Complex PLDs (CPLDs). Programmable function blocks can range in granularity from fine-grained (combinational logic or look-up tables) to coarse-grained (arithmetic logic units or processor cores). Programmable hardware elements may also be referred to as “reconfigurable logic.”

[0032] Computer System - Any of various types of computing or processing systems, including a personal computer system (PC), a mainframe computer system, a workstation, a network appliance, an Internet appliance, a personal digital assistant (PDA), a television system, a grid computing system, or any other device or combination of devices. In general, the term "computer system" can be broadly defined to encompass any device (or combination of devices) having at least one processor that executes instructions from a memory medium.

[0033] User Equipment (UE) (or "UE device")—Any of various types of mobile or handheld computer system devices that perform wireless communications. Examples of UE devices include mobile phones or smartphones (e.g., iPhone™, Android™-based phones), portable gaming devices (e.g., Nintendo DS™, PlayStation Portable™, Gameboy Advance™, iPhone™), laptops, wearable devices (e.g., smart watches, smart glasses), PDAs, portable Internet devices, music players, data storage devices, or other handheld devices. In general, the terms "UE" or "UE device" may be broadly defined to encompass any electronic, computing, and / or telecommunications device (or combination of devices) that is easily carried by a user and capable of wireless communications.

[0034] Base Station - The term "base station" has the full scope of its ordinary meaning and includes at least a wireless communication station that is installed at a fixed location and used for communication as part of a wireless telephone or wireless system.

[0035] Processing Element—refers to various elements or combinations of elements capable of performing functions within a device such as user equipment or a cellular network device. A processing element may include, for example, a processor and associated memory, a portion or circuitry of an individual processor core, an entire processor core, a processor array, a circuit such as an Application Specific Integrated Circuit (ASIC), a programmable hardware element such as a Field Programmable Gate Array (FPGA), and any of various combinations of the above.

[0036] Channel—A medium used to convey information from a sender (transmitter) to a receiver. Note that because the characteristics of the term “channel” may vary according to different wireless protocols, when used herein, the term “channel” is considered to be used consistent with the standard for the type of device with which the term is used. In some standards, channel width may be variable (e.g., depending on device capabilities, band conditions, etc.). For example, LTE may support scalable channel bandwidths from 1.4 MHz to 20 MHz. In contrast, WLAN channels may have a 22 MHz width, and Bluetooth channels may have a 1 MHz width. Other protocols and standards may include different channel definitions. Furthermore, some standards may define and use multiple types of channels, e.g., different channels for uplink or downlink, and / or different channels for different uses, such as data, control information, etc.

[0037] Band - The term "band" has the full scope of the ordinary meaning of band and includes at least that portion of the spectrum (e.g., the radio frequency spectrum) in which channels are used for a purpose or set aside for the same purpose.

[0038] Automatically—refers to an action or operation performed by a computer system (e.g., software executed by a computer system) or device (e.g., a circuit, programmable hardware element, ASIC, etc.) without user input directly specifying or executing the action or operation. Thus, the term “automatically” is in contrast to an operation that is manually performed or specified by a user, where the user provides input to directly perform the operation. An automatic procedure may be initiated by input provided by a user, but the subsequent actions performed “automatically” are not specified by the user; that is, they are not performed “manually,” with the user specifying each action to be performed. For example, a user filling out an electronic form by selecting each field and providing input specifying information (e.g., by typing information, selecting checkboxes, selecting radio selections, etc.) is considered manually filling out the form, even though the computer system must update the form in response to the user actions. A form may also be automatically filled out by a computer system, where the computer system (e.g., software executed on the computer system) analyzes the form's fields and fills out the form without user input specifying answers to the fields. As noted above, a user can invoke automatic form filling but is not involved in the actual filling of the form (e.g., the user does not manually specify answers in fields, but rather the answers are completed automatically). This specification provides various examples of actions that are automatically performed in response to actions taken by a user.

[0039] Approximately—refers to a value that is nearly accurate or precise. For example, approximately may refer to a value that is within 1-10 percent of a precise (or desired) value. Note, however, that the actual threshold (or tolerance) may depend on the application. For example, in some embodiments, "approximately" may mean within 0.1% of some specified or desired value, while in various other embodiments, the threshold may be, for example, 2%, 3%, 5%, etc., as desired or required by the particular application.

[0040] Concurrent—refers to parallel execution or performance in which tasks, processes, or programs execute in an at least partially overlapping manner. For example, concurrent execution may be performed using “strong” or strict parallelism, where tasks are executed (at least partially) in parallel on respective computing elements, or “weak parallelism,” where tasks are executed in an interleaved manner, e.g., by time-division multiplexing of execution threads.

[0041] Various components may be described as being "configured to" perform a task or tasks. In this context, "configured to" is a broad description that generally means "having the structure" to perform a task or tasks during operation. Thus, a component may be configured to perform a task even when the component is not currently performing the task (e.g., a set of conductors may be configured to electrically connect a module to another module even when the two modules are not connected). In some contexts, "configured to" may be a broad description of a structure that generally means "having circuitry" to perform a task or tasks during operation. Thus, a component may be configured to perform a task even when the component is not currently on. In general, the circuitry forming the structure corresponding to "configured to" may include hardware circuitry.

[0042] In the description herein, for convenience, various components may be described as performing a task or tasks. Such descriptions should be construed to include the phrase "configured to." It is expressly intended that a description of a component being configured to perform one or more tasks does not invoke 35 U.S.C. 112(f) interpretation with respect to that component. Figures 1 and 2 - Communication System

[0043] Figure 1 illustrates a simplified exemplary wireless communication system according to some embodiments. It should be noted that the system of Figure 1 is merely one example of a possible system, and that features of the present disclosure may be implemented in any of a variety of systems as desired.

[0044] As shown in the figure, the exemplary wireless communication system includes a base station 102A that communicates over a transmission medium with one or more user devices 106A, 106B, etc. through 106N. Each of the user devices may be referred to herein as a "user equipment" (UE). Accordingly, the user devices 106 are referred to as UEs or UE devices.

[0045] Base station (BS) 102A may be a base transceiver station (BTS) or cell site ("cellular base station") and may include hardware that enables wireless communication with UEs 106A-106N.

[0046] The communication area (or coverage area) of a base station may be referred to as a "cell." The base station 102A and the UE 106 may be configured to communicate over a transmission medium using any of a variety of radio access technologies (RATs), also referred to as wireless communication technologies or telecommunications standards, such as GSM, UMTS (e.g., associated with a WCDMA or TD-SCDMA air interface), LTE, LTE-Advanced (LTE-A), 5G New Radio (5G NR), HSPA, 3GPP2 CDMA2000 (e.g., 1xRTT, 1xEV-DO, HRPD, eHRPD), etc. Note that if the base station 102A is implemented in the context of LTE, it may alternatively be referred to as an "eNodeB" or "eNB." Note that if the base station 102A is implemented in the context of 5G NR, it may alternatively be referred to as a "gNodeB" or "gNB."

[0047] As shown, the base station 102A may also be equipped to communicate with a network 100 (e.g., a cellular service provider's core network, a telecommunications network such as the Public Switched Telephone Network (PSTN), and / or the Internet, among other possibilities). Thus, the base station 102A may facilitate communications between user devices and / or between the user devices and the network 100. In particular, the cellular base station 102A may provide various telecommunications capabilities to the UE 106, such as voice, SMS, and / or data services.

[0048] Base station 102A and other similar base stations (such as base stations 102B-102N) operating according to the same or different cellular communication standards may be provided as a network of cells that can provide continuous or near-continuous overlaid services to UEs 106A-106N and similar devices via one or more cellular communication standards over a geographic area.

[0049] Thus, as shown in FIG. 1, base station 102A may function as a "serving cell" for UEs 106A-106N, and each UE 106 may also receive signals from (if possible within range of) one or more other cells (which may be provided by base stations 102B-102N and / or any other base stations), which may be referred to as "neighboring cells." Such cells may also facilitate communication between user devices and / or between user devices and network 100. Such cells may include "macro" cells, "micro" cells, "pico" cells, and / or cells providing any of various other granularities of coverage area size. For example, base stations 102A-102B shown in FIG. 1 may be macro cells, and base station 102N may be a micro cell. Other configurations are possible.

[0050] In some embodiments, the base station 102A may be a next-generation base station, e.g., a 5G New Radio (5G NR) base station, or "gNB." In some embodiments, the gNB may be connected to a conventional Evolved Packet Core (EPC) network and / or an NR Core (NRC) network. In addition, a gNB cell may include one or more Transition and Reception Points (TRPs). In addition, a UE capable of operating according to 5G NR may be connected to one or more TRPs in one or more gNBs.

[0051] It should be noted that the UE 106 may be capable of communicating using multiple wireless communication standards. For example, the UE 106 may be configured to communicate using at least one cellular communication protocol (e.g., GSM, UMTS (e.g., associated with a WCDMA or TD-SCDMA air interface), LTE, LTE-A, 5G NR, HSPA, 3GPP2 CDMA2000 (e.g., 1xRTT, 1xEV-DO, HRPD, eHRPD), etc.), in addition to wireless networking (e.g., Wi-Fi) and / or peer-to-peer wireless communication protocols (e.g., Bluetooth, Wi-Fi peer-to-peer, etc.). The UE 106 may additionally or alternatively be configured to communicate using one or more Global Navigational Satellite Systems (GNSS, e.g., GPS or GLONASS), one or more mobile television broadcast standards (e.g., ATSC-M / H or DVB-H), and / or any other wireless communication protocol, if desired. Other combinations of wireless communication standards (including three or more wireless communication standards) are also possible.

[0052] 2 illustrates a user equipment 106 (e.g., one of devices 106A-106N) communicating with a base station 102, according to some embodiments. The UE 106 may be a device with cellular communication capabilities, such as a mobile phone, a handheld device, a computer or tablet, or virtually any type of wireless device.

[0053] The UE 106 may include a processor configured to execute program instructions stored in a memory. The UE 106 may perform any of the method embodiments described herein by executing such stored instructions. Alternatively or additionally, the UE 106 may include a programmable hardware element, such as a field programmable gate array (FPGA), configured to perform any of the method embodiments described herein, or any portion of any of the method embodiments described herein.

[0054] The UE 106 may include one or more antennas for communicating using one or more wireless communication protocols or technologies. In some embodiments, the UE 106 may be configured to communicate, for example, using CDMA2000 (1xRTT / 1xEV-DO / HRPD / eHRPD) or LTE using a single shared radio, and / or using GSM or LTE using a single shared radio. The shared radio may be coupled to a single antenna or to multiple antennas (e.g., for MIMO) to perform wireless communication. In general, a radio may include any combination of a baseband processor, analog RF signal processing circuitry (e.g., including filters, mixers, oscillators, amplifiers, etc.), or digital processing circuitry (e.g., for digital modulation and other digital processing). Similarly, a radio may implement one or more receive and transmit chains using the above hardware. For example, the UE 106 may share one or more portions of the receive and / or transmit chains between multiple wireless communication technologies, such as those described above.

[0055] In some embodiments, the UE 106 may include a separate transmit and / or receive chain (e.g., including separate antennas and other radio components) for each wireless communication protocol over which the UE 106 is configured to communicate. As a further possibility, the UE 106 may include one or more radios shared among multiple wireless communication protocols and one or more radios used only by a single wireless communication protocol. For example, the UE 106 may include a shared radio for communicating using either LTE or 5G NR (or LTE, or 1xRTT, or LTE, or GSM) and separate radios for communicating using each of Wi-Fi and Bluetooth. Other configurations are possible. Figure 3 - UE block diagram

[0056] FIG. 3 illustrates an exemplary simplified block diagram of a communication device 106, according to some embodiments. Note that the communication device block diagram of FIG. 3 is merely one example of a possible communication device. According to embodiments, the communication device 106 may be a user equipment (UE) device, a mobile device or station, a wireless device or station, a desktop computer or computing device, a mobile computing device (e.g., a laptop computer, a notebook computer, or a portable computing device), a tablet, and / or a combination of devices, among other devices. As shown in the figure, the communication device 106 may include a set of components 300 configured to perform core functions. For example, the set of components may be implemented as a system on chip (SOC), which may include portions for various purposes. Alternatively, the set of components 300 may be implemented as separate components or groups of components for various purposes. The set of components 300 may be coupled (e.g., communicatively, directly or indirectly) to various other circuits of the communication device 106.

[0057] For example, communication device 106 may include various types of memory (including, for example, NAND flash 310), input / output interfaces such as connector I / F 320 (e.g., for connecting to a computer system, a dock, a charging station, input devices such as a microphone, a camera, a keyboard, output devices such as a speaker, etc.), a display 360 that may be integrated with communication device 106 or may be external to communication device 106, cellular communication circuitry 330 for 5G NR, LTE, GSM, etc., and near-medium range wireless communication circuitry 329 (e.g., Bluetooth and WLAN circuitry). In some embodiments, communication device 106 may include wired communication circuitry (not shown), such as a network interface card for Ethernet.

[0058] The cellular communication circuitry 330 may be communicatively coupled (e.g., directly or indirectly) to one or more antennas, such as antennas 335 and 336, as shown. The near-medium range wireless communication circuitry 329 may also be communicatively coupled (e.g., directly or indirectly) to one or more antennas, such as antennas 337 and 338, as shown. Alternatively, the near-medium range wireless communication circuitry 329 may be communicatively coupled (e.g., directly or indirectly) to antennas 335 and 336 in addition to or instead of being communicatively coupled (e.g., directly or indirectly) to antennas 337 and 338. The near-medium range wireless communication circuitry 329 and / or the cellular communication circuitry 330 may include multiple receive chains and / or multiple transmit chains for receiving and / or transmitting multiple spatial streams, such as in a Multiple-Input Multiple Output (MIMO) configuration.

[0059] In some embodiments, as described further below, the cellular communication circuitry 330 may include dedicated receive chains (e.g., a first receive chain for LTE and a second receive chain for 5G NR) for multiple RATs (e.g., including dedicated processors and / or radios and / or communicatively coupled, directly or indirectly, to the dedicated processors and / or radios). Additionally, in some embodiments, the cellular communication circuitry 330 may include a single transmit chain that can be switched between radios dedicated to particular RATs. For example, a first radio may be dedicated to a first RAT, e.g., LTE, and may communicate with a dedicated receive chain and a transmit chain shared with an additional radio, e.g., a second radio, which may be dedicated to a second RAT, e.g., 5G NR, and may communicate with a dedicated receive chain and a shared transmit chain.

[0060] Communication device 106 may also include and / or be configured for use with one or more user interface elements, which may include any of a variety of elements, such as a display 360 (which may be a touchscreen display), a keyboard (which may be a separate keyboard or may be implemented as part of the touchscreen display), a mouse, a microphone and / or speaker, one or more cameras, one or more buttons, and / or any of a variety of other elements capable of providing information to a user and / or receiving or interpreting user input.

[0061] The communication device 106 may further include one or more smart cards 345 that include SIM (Subscriber Identity Module) functionality, such as one or more UICC(s) (Universal Integrated Circuit Card(s)) cards 345.

[0062] As shown, SOC 300 may include processor(s) 302 that may execute program instructions for communication device 106 and display circuitry 304 that may perform graphics processing and provide display signals to display 360. Processor(s) 302 may be coupled to a memory management unit (MMU) 340 that may be configured to receive addresses from processor(s) 302 and translate these addresses to locations in memory (e.g., memory 306, read only memory (ROM) 350, NAND flash memory 310) and / or other circuits or devices, such as display circuitry 304, near field communication circuitry 229, cellular communication circuitry 330, connector I / F 320, and / or display 360. MMU 340 may be configured to perform memory protection and page table translation or setup. In some embodiments, the MMU 340 may be included as part of the processor(s) 302 .

[0063] As described above, the communication device 106 may be configured to communicate using wireless and / or wired communication circuitry. The communication device 106 may be configured to transmit a request to attach to a first network node operating according to a first RAT and transmit an indication that the wireless device is capable of maintaining substantially simultaneous connections with the first network node and a second network node operating according to a second RAT. The wireless device may also be configured to transmit a request to attach to a second network node. The request may include an indication that the wireless device is capable of maintaining substantially simultaneous connections with the first network node and the second network node. Further, the wireless device may be configured to receive an indication that dual connectivity with the first network node and the second network node has been established.

[0064] As described herein, the communications device 106 may include hardware and software components for implementing the above-described features for time-division multiplexing UL data for NSA NR operation. The processor 302 of the communications device 106 may be configured to perform some or all of the features described herein, for example, by executing program instructions stored on a memory medium (e.g., a non-transitory computer-readable memory medium). Alternatively (or additionally), the processor 302 may be configured as a programmable hardware element, such as a field programmable gate array (FPGA), or as an application-specific integrated circuit (ASIC). Alternatively (or additionally), the processor 302 of the communications device 106 may be configured to implement some or all of the features described herein in conjunction with any one or more of the other components 300, 304, 306, 310, 320, 329, 330, 340, 345, 350, and 360.

[0065] Additionally, as described herein, processor 302 may include one or more processing elements. Accordingly, processor 302 may include one or more integrated circuits (ICs) configured to perform the functions of processor 302. Additionally, each of the integrated circuits may include circuitry (e.g., a first circuit, a second circuit, etc.) configured to perform the functions of processor(s) 302.

[0066] Further, as described herein, the cellular communication circuit 330 and the near-field communication circuit 329 may each include one or more processing elements. In other words, one or more processing elements may be included in the cellular communication circuit 330, and similarly, one or more processing elements may be included in the near-field communication circuit 329. Thus, the cellular communication circuit 330 may include one or more integrated circuits (ICs) configured to perform the functions of the cellular communication circuit 330. In addition, each integrated circuit may include circuitry (e.g., a first circuit, a second circuit, etc.) configured to perform the functions of the cellular communication circuit 230. Similarly, the near-field communication circuit 329 may include one or more ICs configured to perform the functions of the near-field communication circuit 32. In addition, each integrated circuit may include circuitry (e.g., a first circuit, a second circuit, etc.) configured to perform the functions of the near-field communication circuit 329. Figure 4 - Base station block diagram

[0067] 4 shows an exemplary block diagram of a base station 102, according to some embodiments. Note that the base station of FIG. 4 is merely one example of a possible base station. As shown, the base station 102 includes a processor(s) 404 that may execute program instructions for the base station 102. The processor(s) 404 may also be coupled to a memory management unit (MMU) 440, which may be configured to receive addresses from the processor(s) 404 and translate those addresses into locations in memory (e.g., memory 460 and read-only memory (ROM) 450) or other circuits or devices.

[0068] The base station 102 may include at least one network port 470. The network port 470 may be configured to couple to a telephone network and provide devices, such as the UE devices 106, with access to the telephone network as described above in FIGS.

[0069] Network port 470 (or additional network ports) may also or alternatively be configured to couple to a cellular network, for example, a core network of a cellular service provider. The core network may provide mobility-related services and / or other services to multiple devices, such as UE device 106. In some cases, network port 470 may couple to a telephone network through the core network and / or the core network may provide telephone service (e.g., between other UE devices serviced by the cellular service provider).

[0070] In some embodiments, the base station 102 may be a next-generation base station, e.g., a 5G New Radio (5G NR) base station, or "gNB." In such embodiments, the base station 102 may be connected to a conventional evolved packet core (EPC) network and / or an NR core (NRC) network. In addition, the base station 102 may be considered a 5G NR cell and may include one or more transition and reception points (TRPs). In addition, a UE capable of operating according to 5G NR may be connected to one or more TRPs in one or more gNBs.

[0071] The base station 102 may include at least one antenna 434, and possibly multiple antennas. The at least one antenna 434 may be configured to operate as a wireless transceiver and may be further configured to communicate with the UE device 106 via a radio 430. The antenna 434 communicates with the radio 430 via a communication chain 432. The communication chain 432 may be a receive chain, a transmit chain, or both. The radio 430 may be configured to communicate via various wireless communication standards, including, but not limited to, 5G NR, LTE, LTE-A, GSM, UMTS, CDMA2000, Wi-Fi, etc.

[0072] The base station 102 may be configured to communicate wirelessly using multiple wireless communication standards. In some cases, the base station 102 may include multiple radios, which may enable the base station 102 to communicate according to multiple wireless communication technologies. For example, in one possibility, the base station 102 may include an LTE radio for performing communications according to LTE and a 5G NR radio for performing communications according to 5G NR. In such a case, the base station 102 may be capable of operating as both an LTE base station and a 5G NR base station. In another possibility, the base station 102 may include a multimode radio, which may be capable of performing communications according to any of multiple wireless communication technologies (e.g., 5G NR and Wi-Fi, LTE and Wi-Fi, LTE and UMTS, LTE and CDMA2000, UMTS and GSM, etc.).

[0073] As described further herein below, the BS 102 may include hardware and software components for implementing or supporting the implementation of the features described herein. The processor 404 of the base station 102 may be configured to implement or support the implementation of some or all of the methods described herein, for example, by executing program instructions stored on a memory medium (e.g., a non-transitory computer-readable memory medium). Alternatively, the processor 404 may be configured as a programmable hardware element, such as an FPGA (field programmable gate array), or as an ASIC (application-specific integrated circuit), or a combination thereof. Alternatively (or in addition), the processor 404 of the BS 102, together with one or more of the other components 430, 432, 434, 440, 450, 460, 470, may be configured to perform or support the execution of some or all of the features described herein.

[0074] Additionally, as described herein, the processor(s) 404 may be comprised of one or more processing elements. In other words, one or more processing elements may be included within the processor(s) 404. Thus, the processor(s) 404 may include one or more integrated circuits (ICs) configured to perform the functions of the processor(s) 404. Additionally, each integrated circuit may include circuitry (e.g., a first circuit, a second circuit, etc.) configured to perform the functions of the processor(s) 404.

[0075] Further, as described herein, radio 430 may be comprised of one or more processing elements. In other words, one or more processing elements may be included within radio 430. Thus, radio 430 may include one or more integrated circuits (ICs) configured to perform the functions of radio 430. In addition, each integrated circuit may include circuitry (e.g., a first circuit, a second circuit, etc.) configured to perform the functions of radio 430. Figure 5: Block diagram of a cellular communication circuit

[0076] 5 shows an exemplary simplified block diagram of cellular communication circuitry, according to some embodiments. It should be noted that the block diagram of the cellular communication circuitry of FIG. 5 is only one example of possible cellular communication circuitry. According to embodiments, the cellular communication circuitry 330 may be included within a communication device, such as the communication device 106 described above. As noted above, the communication device 106 may be, among other devices, a user equipment (UE) device, a mobile device or mobile station, a wireless device or wireless base station, a desktop computer or computing device, a mobile computing device (e.g., a laptop, notebook, or portable computing device), a tablet, and / or a combination of devices.

[0077] The cellular communication circuitry 330 may be communicatively coupled (e.g., communicatively, directly or indirectly) to one or more antennas, such as antennas 335a, 335b, and 336, as shown (in FIG. 3). In some embodiments, the cellular communication circuitry 330 may include dedicated receive chains (e.g., a first receive chain for LTE and a second receive chain for 5G NR) for multiple RATs (e.g., including a dedicated processor and / or radio and / or communicatively coupled, directly or indirectly, to a dedicated processor and / or radio). For example, as shown in FIG. 5, the cellular communication circuitry 330 may include a modem 510 and a modem 520. The modem 510 may be configured for communication according to a first RAT, e.g., LTE or LTE-A, and the modem 520 may be configured for communication according to a second RAT, e.g., 5G NR.

[0078] As shown, the modem 510 may include one or more processors 512 and memory 516 in communication with the processor 512. The modem 510 may be in communication with a radio frequency (RF) front end 530. The RF front end 530 may include circuitry for transmitting and receiving wireless signals. For example, the RF front end 530 may include receive circuitry (RX) 532 and transmit circuitry (TX) 534. In some embodiments, the receive circuitry 532 may be in communication with a downlink (DL) front end 550, which may include circuitry for receiving wireless signals via an antenna 335a.

[0079] Similarly, the modem 520 may include one or more processors 522 and a memory 526 in communication with the processor 522. The modem 520 may be in communication with an RF front end 540. The RF front end 540 may include circuitry for transmitting and receiving wireless signals. For example, the RF front end 540 may include receive circuitry 542 and transmit circuitry 544. In some embodiments, the receive circuitry 542 may be in communication with a DL front end 560, which may include circuitry for receiving wireless signals via the antenna 335b.

[0080] In some embodiments, switch 570 may couple transmit circuitry 534 to an uplink (UL) front end 572. Additionally, switch 570 may couple transmit circuitry 544 to an UL front end 572. The UL front end 572 may include circuitry for transmitting wireless signals via antenna 336. Thus, when cellular communication circuitry 330 receives an instruction to transmit according to a first RAT (e.g., as supported via modem 510), switch 570 may be switched to a first state that enables modem 510 to transmit signals according to the first RAT (e.g., via a transmit chain that includes transmit circuitry 534 and UL front end 572). Similarly, when cellular communication circuitry 330 receives an instruction to transmit according to a second RAT (e.g., as supported via modem 520), switch 570 may be switched to a second state that enables modem 520 to transmit signals according to the second RAT (e.g., via a transmit chain that includes transmit circuitry 544 and UL front end 572).

[0081] In some embodiments, the cellular communication circuit 330 may be configured to establish a first wireless link with a first cell operating in a first system bandwidth according to a first radio access technology (RAT) and to establish a second wireless link with a second cell operating in a second system bandwidth according to a second radio access technology (RAT). Further, the cellular communication circuit 330 may be configured to determine whether the cellular communication circuit 330 has uplink activity scheduled according to both the first RAT and the second RAT, and, if uplink activity is scheduled according to both the first RAT and the second RAT, to perform uplink activity for both the first RAT and the second RAT by time division multiplexing (TDM) uplink data for the first RAT and uplink data for the second RAT. In some embodiments, when uplink activity is scheduled according to both the first RAT and the second RAT, the cellular communication circuitry 330 may be configured to receive an allocation of a first UL subframe for transmission according to the first RAT and an allocation of a second UL subframe for transmission according to the second RAT to perform uplink activity for both the first RAT and the second RAT by time division multiplexing (TDM) the uplink data for the first RAT and the uplink data for the second RAT. In some embodiments, the TDM of the uplink data may be performed at a physical layer of the cellular communication circuitry 330. In some embodiments, the cellular communication circuitry 330 may further be configured to receive an allocation of a respective portion of a UL subframe for control signaling according to one of the first or second RAT.

[0082] As described herein, modem 510 may include hardware and software components for implementing the above features or for time-division multiplexing UL data for NSA NR operations, as well as various other techniques described herein. Processor 512 may be configured to implement some or all of the features described herein, for example, by executing program instructions stored on a memory medium (e.g., a non-transitory computer-readable memory medium). Alternatively (or in addition), processor 512 may be configured as a programmable hardware element, such as an FPGA (field programmable gate array), or as an ASIC (application-specific integrated circuit). Alternatively (or in addition), processor 512 may be configured to implement some or all of the features described herein in conjunction with any one or more of the other components 530, 532, 534, 550, 570, 572, 335, and 336.

[0083] Additionally, as described herein, processor 512 may include one or more processing elements. Thus, processor 512 may include one or more integrated circuits (ICs) configured to perform the functions of processor 512. Additionally, each integrated circuit may include circuitry (e.g., a first circuit, a second circuit, etc.) configured to perform the functions of processor 512.

[0084] As described herein, modem 520 may include hardware and software components for implementing the above features for time-division multiplexing UL data for NSA NR operation, as well as various other techniques described herein. Processor 522 may be configured to implement some or all of the features described herein, for example, by executing program instructions stored on a memory medium (e.g., a non-transitory computer-readable memory medium). Alternatively (or in addition), processor 522 may be configured as a programmable hardware element, such as an FPGA (field-programmable gate array), or as an ASIC (application-specific integrated circuit). Alternatively (or in addition), processor 522 may be configured to implement some or all of the features described herein in conjunction with one or more of other components 540, 542, 544, 550, 570, 572, 335, and 336.

[0085] Additionally, as described herein, processor 522 may include one or more processing elements. Accordingly, processor 522 may include one or more integrated circuits (ICs) configured to perform the functions of processor 522. Additionally, each integrated circuit may include circuitry (e.g., a first circuit, a second circuit, etc.) configured to perform the functions of processor 522. 5G NR Non-standalone (NSA) operation with LTE

[0086] In some implementations, fifth-generation (5G) wireless communications will initially be deployed simultaneously with current wireless communications standards (e.g., LTE). For example, dual connectivity between LTE and 5G New Radio (5G NR or NR) is specified as part of the initial deployment of NR. Thus, as shown in FIGS. 6A-B, an evolved packet core (EPC) network 600 can continue to communicate with a current LTE base station (e.g., eNB 602). In addition, the eNB 602 may be in communication with a 5G NR base station (e.g., gNB 604) and can pass data between the EPC network 600 and the gNB 604. Thus, the EPC network 600 can be used (or reused), and the gNB 604 can serve as additional capabilities for the UE (e.g., providing increased downlink throughput to the UE). In other words, LTE can be used for control plane signaling, and NR can be used for user plane signaling. Thus, LTE can be used to establish a connection to the network, and NR can be used for data services.

[0087] 6B illustrates an example of a proposed protocol stack for the eNB 602 and the gNB 604. As shown, the eNB 602 may include a medium access control (MAC) layer 632 that interfaces with radio link control (RLC) layers 622a-b. The RLC layer 622a may interface with a packet data convergence protocol (PDCP) layer 612a, and the RLC layer 622b may interface with a PDCP layer 612b. Similar to dual connectivity as specified in LTE-Advanced Release 12, the PDCP layer 612a may interface to the EPC network 600 via a master cell group (MCG) bearer, and the PDCP layer 612b may interface with the EPC network 600 via a split bearer.

[0088] Additionally, as shown in the figure, the gNB 604 may include a MAC layer 634 that interfaces with RLC layers 624a-b. The RLC layer 624a may interface with the PDCP layer 622b of the eNB 602 via an X2 interface for information exchange and / or coordination (e.g., UE scheduling) between the eNB 602 and the gNB 604. Additionally, the RLC layer 624b may interface with the PDCP layer 614. Similar to dual connectivity as specified in LTE-Advanced Release 12, the PDCP layer 614 may interface with the EPC network 600 via a secondary cell group (SCG) bearer. Thus, the eNB 602 may be considered a master node (MeNB), and the gNB 604 may be considered a secondary node (SgNB). In some scenarios, a UE may be required to maintain connections to both an MeNB and an SgNB. In such a scenario, the MeNB may be used to maintain the radio resource control (RRC) connection to the EPC, and the SgNB may be used for capabilities (e.g., additional downlink and / or uplink throughput). Reference Signal

[0089] A wireless device, such as a user equipment (UE), may be configured to perform various tasks, including using reference signals (RS) provided by one or more cellular base stations. For example, initial access and beam measurement by a wireless device may be performed based at least in part on synchronization signal blocks (SSBs) provided by one or more cells served by one or more cellular base stations within the communication range of the wireless device. Another type of reference signal commonly provided in a cellular communication system may include channel state information (CSI) RS. Various types of CSI-RS may be provided for tracking (e.g., time and frequency offset tracking), beam management (e.g., with iterations configured to assist in determining one or more beams to use for uplink and / or downlink communications), and / or channel measurement (e.g., a CSI-RS configured in a resource set to measure the quality of a downlink channel and report information related to this quality measurement to a base station), among other possibilities. For example, in the case of a CSI-RS for CSI acquisition, the UE may periodically perform channel measurements and periodically transmit channel state information (CSI) to the BS. The base station can then receive and use this channel state information to determine adjustments to various parameters during communication with the wireless device. In particular, the BS can use the received channel state information to adjust the coding of downlink transmissions to improve downlink channel quality.

[0090] In many cellular communication systems, a base station may periodically transmit some or all such reference signals (or pilot signals), such as SSB and / or CSI-RS. In some cases, an aperiodic reference signal (e.g., for aperiodic CSI reporting), such as an aperiodic channel state information reference signal (AP-CSI-RS), may also or alternatively be provided.

[0091] As a detailed example, in the 3GPP NR cellular communication standard, according to at least some embodiments, the channel state information fed back from the UE based on the CSI-RS for CSI acquisition may include one or more of a channel quality indicator (CQI), a precoding matrix indicator (PMI), a rank indicator (RI), a CSI-RS resource indicator (CRI), a SS / PBCH resource block indicator (SSBRI), and a layer indicator (LI).

[0092] The channel quality information may be provided to the base station for link adaptation, for example, to provide guidance on which modulation and coding scheme (MCS) the base station should use when transmitting data. For example, when it is determined that the downlink channel communication quality between the base station and the UE is high, the UE may feedback a high CQI value, thereby allowing the base station to transmit data using a relatively high modulation order and / or a low channel coding rate. As another example, when it is determined that the downlink channel communication quality between the base station and the UE is low, the UE may feedback a low CQI value, thereby allowing the base station to transmit data using a relatively low modulation order and / or a high channel coding rate.

[0093] Precoding matrix indicator (PMI) feedback may include preferred precoding matrix information that can be provided to a base station to indicate whether the base station should use a MIMO precoding scheme. In other words, the UE may measure the quality of a downlink MIMO channel between the base station and the UE based on a received pilot signal on the channel and recommend, through PMI feedback, which MIMO precoding scheme is desired to be applied by the base station. In some cellular systems, the PMI configuration is expressed in a matrix format that provides linear MIMO precoding. The base station and the UE may share a codebook consisting of multiple precoding matrices, and each MIMO precoding matrix in the codebook may have a unique index. Thus, as part of the channel state information fed back by the UE, the PMI may include an index (or possibly multiple indices) corresponding to the most preferred MIMO precoding matrix(ies) in the codebook. This allows the UE to minimize the amount of feedback information. Thus, according to at least some embodiments, the PMI can indicate which precoding matrix from the codebook should be used for transmission to the UE.

[0094] The rank indicator information (RI feedback) may indicate, for example, the number of transmission layers that the UE has determined can be supported by the channel when the base station and UE have multiple antennas that may enable multi-layer transmission through spatial multiplexing. Collectively, the RI and PMI may allow the base station to know, for example, which precoding needs to be applied to which layer depending on the number of transmission layers.

[0095] In some cellular systems, the PMI codebook is defined according to the number of transmission layers. In other words, for an R-layer transmission, there are N N t A × R matrix may be defined (e.g., R represents the number of layers, and N trepresents the number of transmitter antenna ports, and N represents the size of the codebook). In such a scenario, the number of transmission layers (R) is proportional to the number of precoding matrices (N t × R matrix), and thus in this context R can be referred to as the "rank indicator (RI)."

[0096] Thus, the channel state information may include an assigned rank (e.g., a rank indicator, or RI). For example, a MIMO-capable UE communicating with a BS may include four receiver chains, e.g., four antennas. The BS may also include four or more antennas to enable MIMO communication (e.g., 4x4 MIMO). Thus, the UE may be able to simultaneously receive up to four (or more) signals (e.g., layers) from the BS. Layer to antenna mapping may be applied, e.g., each layer may be mapped to any number of antenna ports (e.g., antennas). Each antenna port may transmit and / or receive information associated with one or more layers. The rank may include multiple bits and may indicate the number of signals the BS may transmit to the UE in the next time period (e.g., during the upcoming transmission time interval or TTI). For example, a rank 4 indication may indicate that the BS will transmit four signals to the UE. One possibility is that the RI may be two bits in length (e.g., because two bits are sufficient to distinguish four different rank values). It should be noted that other numbers and / or configurations of antennas (e.g., at either or both the UE or BS) and / or other numbers of data layers are possible according to various embodiments. Configuration and default beam determination for high speed single frequency networks (SFNs)

[0097] As the use of wireless devices generally increases, wireless devices are being used in an increasingly wide range of contexts. One such increasingly wide range of use may include the speed at which the wireless device is moving. A user may occasionally utilize their wireless device while stationary, at pedestrian speeds, in an automobile, and while on faster forms of transportation such as high-speed trains, among other possibilities. The speed at which the wireless device is moving may have different effects on the operation of the wireless device. For example, a wireless device moving at a high speed may move from one cell to another more frequently than a wireless device moving at a slower speed, and each such transition between cells may proceed according to a more compressed timeline. If the wireless device could determine with sufficient accuracy the speed at which it is currently moving, it may be possible to accordingly modify some behavior of the wireless device according to the speed at which the wireless device is moving, potentially improving the user experience, reducing power consumption, and / or possibly providing improved operating characteristics.

[0098] High-speed trains (HST) have become an important means of transportation in many parts of the world. Furthermore, travelers frequently use wireless devices (e.g., mobile phones) during these high-speed journeys, making this a particularly interesting scenario for user equipment (UE) and network operators. In one HST scenario, when a UE (and thus an HST) is moving, it may move between two transmission / reception points (TRPs). The UE may therefore observe a very high positive Doppler shift from one TRP and a very high negative Doppler shift from the other TRP. As a result, the composite channel may change rapidly (e.g., on the order of 2 kHz or more). This change in the composite channel may potentially reduce channel capacity and / or make it difficult for the UE to perform accurate channel estimation. As one potential solution (HST-SFN Scheme 1), the UE may be configured to estimate two separate Doppler shifts (one from each TRP) to assist the UE in the channel estimation procedure. Additionally or alternatively, the network may be configured to pre-compensate for Doppler shift (HST-SFN with pre-compensation), and therefore the NW may need to know the Doppler shift before it can provide such pre-compensation.

[0099] In some embodiments, a medium access control-control element (MAC-CE) may be used to configure two transmission configuration indicator (TCI) states for a control resource set (CORESET). Furthermore, a tracking reference signal (TRS) may be transmitted in a TRP-specific or non-SFN manner. Additionally or alternatively, a demodulation reference signal (DM-RS) from a TRP and a physical downlink control channel / physical downlink shared channel (PDCCH / PDSCH) transmission may be transmitted in an SFN manner. Therefore, the determination of the CORESET TCI configuration and the default beam for the PDSCH and CSI-RS is an area of ​​interest for improving the HST-SFN configuration and default beam design.

[0100] According to some embodiments, a network (e.g., a base station) may receive first signaling from a user equipment (UE) including an indication of Doppler shift measurements or one or more control resource set (CORESET) TCI configuration capabilities. For example, the UE may indicate whether it supports a CORESET with one TCI state or a CORESET with two TCI states. Additionally or alternatively, according to some embodiments, the UE may indicate support for a mixed configuration of CORESETs with one and / or two TCI states. Thus, based on the indication, the network may determine one or more CORESET TCI states to configure the UE for so that the UE can more efficiently communicate with multiple TRPs of the network (between which the UE may be moving). For example, the network may determine that all CORESETs within the same active bandwidth portion (BWP) of a component carrier (CC) should be configured to have a single TCI state to enable a more efficient way for the UE to communicate with multiple TRPs or perform its channel measurements. Additionally or alternatively, the network may decide that all CORESETs within the same active BWP of a CC should be configured to have a TCI state of 2. According to some embodiments, a BS (e.g., a network) may configure some CORESETs with one TCI state and other / additional CORESETs (within the same active BWP of a CC) with two TCI states.

[0101] In some embodiments, the network may send signaling to the UE to configure one or more CORESETs with one or more TCI states. According to some embodiments, the signaling may include media access control-control element (MAC-CE) signaling. For example, the MAC-CE may be able to configure each CORESET with one or two TCI states as a way to provide PDCCH reliability enhancement for HST. In some embodiments, for different CORESETs within the same active bandwidth portion (BWP) within a component carrier (CC), the network (NW) may configure all CORESETs within the same active BWP within the CC to all have two TCI states or all have a single TCI state. Additionally or alternatively, the network may configure some CORESETs with one TCI state and other CORESETs within the same active BWP within the CC with two TCI states. In some embodiments, the UE may be able to report capabilities regarding whether the UE supports a mixed configuration of some CORESETs with one TCI state and other CORESETs with two TCI states.

[0102] According to some embodiments, if one or more CORESETs are configured with one TCI state and one or more additional CORESETs are configured with two TCI states in the same BWP, the CORESETs associated with a USS (UE-specific search space) may be required to be configured in the same manner. For example, in some embodiments, the CORESETs may all be configured with a single TRP scheme (e.g., configured with a single TCI state). Additionally or alternatively, the CORESETs may all be configured with an HST-SFN scheme (e.g., configured with two TCI states). Thus, if configured with an HST-SFN scheme, they may also be configured with the same HST-SFN scheme. In other words, the CORESETs may all be configured to support HST-SFN scheme 1 or HST-SFN with pre-compensation.

[0103] According to some embodiments, in the same BWP, if one or more CORESETs are configured with one TCI state and one or more additional CORESETs are configured with two TCI states, the CORESET associated with the USS may be configured with two TCI states and the CORESET associated with the CSS (common search space) may be configured with one TCI state. Furthermore, the CSS may involve utilizing one or more PDCCH CSS sets, such as a Type 0-PDCCH CSS set for SIB1 monitoring, a Type 0A-PDCCH CSS set for other SI monitoring, a Type 1-PDCCH CSS set for other RACH monitoring, a Type 2-PDCCH CSS set for other paging monitoring, or a Type 3-PDCCH CSS set for special DCI 2_x monitoring.

[0104] According to further embodiments, when the same CORESET is configured in different search spaces, the same TCI configuration may be utilized for the same CORESET in the different search spaces. Additionally or alternatively, according to some embodiments, different TCI states may be configured for the same CORESET in different search spaces. For example, a CORESET may have one TCI state in one search space, and therefore the same CORESET may have two TCI states when configured in different search spaces. In some embodiments, the UE may report one or more capabilities regarding whether the UE supports mixed configurations, with some CORESETs having one TCI state and other CORESETs having two TCI states.

[0105] According to some embodiments, a UE may receive signaling from a base station (BS) of a network indicating one or more transmission configuration indicator (TCI) state configurations that the UE will utilize for communication with multiple TRPs of the network (e.g., TRPs through which the UE may be moving at high speed). For example, the UE may have previously indicated to the base station whether it supports a CORESET with one TCI state or a CORESET with two TCI states. Additionally or alternatively, according to some embodiments, the UE may have indicated that it supports a mixed configuration of CORESETs with one and / or two TCI states. Thus, the BS may determine that all CORESETs within the same active bandwidth portion (BWP) of a component carrier (CC) should be configured to have a single TCI state. Additionally or alternatively, the network may determine that all CORESETs within the same active BWP of a CC should be configured to have two TCI states. According to some embodiments, a BS (e.g., a network) may configure some CORESETs with one TCI state and other / additional CORESETs (within the same active BWP of a CC) with two TCI states. Thus, the BS may send signaling to the UE indicating one or more determined transmission configuration indicator (TCI) state configurations for configuring the UE.

[0106] Thus, the UE may select one or more default beams to use when interacting with multiple TRPs based on the indication. For example, the UE may utilize a default beam to perform sample buffering for one or more TRPs. In some embodiments, when a high-speed SFN is not configured to support a physical downlink control channel (PDCCH) but is configured to support a physical downlink shared channel (PDSCH), one or more default beams may be selected to perform subsequent communications using the PDSCH, according to some embodiments. For example, a first scenario may include a case in which the NW does not configure a TCI in the DCI, and a second scenario may include a case in which the NW configures a TCI in the DCI but the time offset between reception of the DL DCI and the corresponding PDSCH is less than the specified parameter timeDurationForQCL. Thus, according to some embodiments, the PDSCH default beam may be determined by the TCI codepoint with the lowest index that includes two TCI states (among activated TCI codepoints for PDSCH reception). Additionally or alternatively, the PDSCH default beam may be determined by the CORESET with the lowest ID in the latest slot in which the UE monitors the PDCCH. According to some embodiments, the PDSCH default beam may be determined by the TCI codepoint with the lowest index that contains one TCI state (among the activated TCI codepoints for PDSCH reception). In some embodiments, the PDSCH default beam may be determined by the CORESET with the lowest ID and the second lowest ID (if any) in the latest slot in which the UE monitors the PDCCH.

[0107] According to some embodiments, a UE may use one or more selected default beams when performing one or more transmissions and / or receptions on a PDCCH and / or a PDSCH using multiple TRPs. For example, the UE may communicate with multiple TRPs (e.g., a network) through the use of supported PDSCHs. Additionally or alternatively, the UE may utilize one or more selected default beams to perform channel estimation related to an aperiodic channel state information reference signal (AP-CSI-RS) of the multiple TRPs. In other words, the UE may communicate with the network using the selected default beams. Additional Information

[0108] In some embodiments, when an HST-SFN is configured for both the PDCCH and the PDSCH, a default beam may be determined for the PDSCH according to the above scenario in which the NW does not configure a TCI in the DCI, or an alternative scenario in which the NW configures a TCI in the DCI but the time offset between reception of the DL DCI and the corresponding PDSCH is less than the specified parameter timeDurationForQCL. Thus, according to some embodiments, the PDSCH default beam may be determined by the TCI codepoint with the lowest index that contains two TCI states (among the activated TCI codepoints for PDSCH reception). Additionally or alternatively, the PDSCH default beam may be determined by the CORESET with the lowest ID configured with two TCI states in the latest slot in which the UE monitors the PDCCH. Furthermore, if there is no CORESET with two TCI states, the PDSCH default beam may be determined by the CORESET with the lowest ID that contains a single TCI state. According to some embodiments, the PDSCH default beam may be determined by the TCI codepoint with the lowest index that contains one TCI state (among the activated TCI codepoints for PDSCH reception). In some embodiments, the PDSCH default beam may be determined by the CORESET with the lowest ID that is configured with one TCI state in the latest slot in which the UE monitors the PDCCH.

[0109] In some embodiments, when an HST-SFN is configured for a PDSCH, the UE may report whether the UE supports one or more extended PDSCH default beam capabilities. Additionally or alternatively, in scenarios where PDSCH default beam capabilities are not supported, the NW may be required to configure a TCI in a non-fallback DCI (e.g., DCI formats 1_1 and 1_2). Thus, the NW may need to ensure that the time offset between reception of a DL DCI and the corresponding PDSCH is equal to or greater than the parameter timeDurationForQCL. In some embodiments, the NW may configure a TCI when an HST-SFN is configured for a PDSCH and / or a PDCCH, or when DCI-based dynamic switching between an HST-SFN and other single-TRP or multi-TRP schemes is configured for a PDSCH.

[0110] According to some embodiments, when an HST-SFN is not configured for the PDCCH but an HST-SFN is configured for the PDSCH, the default beam for the AP-CSI-RS may be determined according to a scenario in which the time offset between reception of DL DCI and the corresponding AP-CSI-RS is less than a parameter such as beamSwitchTiming. In some embodiments, the AP-CSI-RS default beam may be determined by the CORESET with the lowest ID in the latest slot in which the UE monitors the PDCCH. Additionally or alternatively, the AP-CSI-RS default beam may be determined by the TCI codepoint with the lowest index containing one TCI state (among the activated TCI codepoints for PDSCH reception). According to some embodiments, the AP-CSI-RS default beam may be determined by the TCI codepoint with the lowest index containing two TCI states (among the activated TCI codepoints for PDSCH reception). Additionally or alternatively, the AP-CSI-RS default beam may be determined by the CORESET with the lowest ID and the second-lowest ID (if any) in the latest slot in which the UE monitors the PDCCH.

[0111] According to some embodiments, when HST-SFN is configured for both the PDCCH and the PDSCH, the default beam for the AP-CSI-RS may be determined according to the above scenario in which the time offset between reception of DL DCI and the corresponding AP-CSI-RS is less than a parameter such as beamSwitchTiming. For example, in some embodiments, the default beam for the AP-CSI-RS may be determined according to the CORESET with the lowest ID in the latest slot in which the UE monitors the PDCCH. For example, when the selected CORESET is configured with two TCI states, the first TCI state may be used, or the UE implementation may decide to select one TCI state. Additionally or alternatively, the default beam for the AP-CSI-RS may be determined according to the TCI codepoint with the lowest index that contains one TCI state (among the activated TCI codepoints for PDSCH reception). In some embodiments, the default beam for the AP-CSI-RS may be determined according to the TCI codepoint with the lowest index that contains two TCI states (among the activated TCI codepoints for PDSCH reception). Additionally or alternatively, the default beam for the AP-CSI-RS may be determined according to the CORESET with the lowest ID configured in one TCI state in the latest slot in which the UE monitors the PDCCH.

[0112] According to some embodiments, when HST-SFN is configured for PDCCH but not for PDSCH, the default beam for the AP-CSI-RS may be determined according to the above scenario in which the time offset between reception of DL DCI and the corresponding AP-CSI-RS is less than a parameter such as beamSwitchTiming. For example, in some embodiments, the default beam for the AP-CSI-RS may be determined according to the CORESET with the lowest ID in the latest slot in which the UE monitors the PDCCH. Thus, when the selected CORESET consists of two TCI states, the first TCI state may be used, or it may be determined by the UE implementation to select one TCI state. Additionally or alternatively, the default beam for the AP-CSI-RS may be determined according to the TCI codepoint with the lowest index (among activated TCI codepoints for PDSCH reception). In some embodiments, the default beam for the AP-CSI-RS may be determined according to the CORESET with the lowest ID configured in one TCI state in the latest slot in which the UE monitors the PDCCH. According to a further embodiment, when HST-SFN is configured for PDSCH and / or PDCCH, the UE may be configured to report whether it supports enhanced AP-CSI-RS default beam capabilities. Figure 7 shows the method of CORESET TCI configuration in a high-speed single-frequency network.

[0113] As wireless device capabilities increase, it may be useful to provide techniques that can take advantage of those increased wireless device capabilities, for example, to improve wireless communication reliability, to reduce wireless communication latency, to increase the amount of data that can be communicated, and / or for any of a variety of other possible reasons.

[0114] One wireless device capability that may be beneficial to utilize when performing wireless communications may include the ability to use multiple beams to transmit and / or receive in parallel / simultaneously or at different times, for example, to increase the amount of data that can be transmitted and / or to improve the reliability of wireless communications by providing repetition of data or signaling communicated using beam diversity.

[0115] Among the possible areas where such use of multiple beams may be deployed to potentially improve communication reliability and / or provide other possible benefits may, according to at least some embodiments, include CORESET TCI configurations of multiple TRPs in high-speed single-frequency networks.

[0116] Therefore, in at least some instances, it may be beneficial to specify techniques for performing CORESET TCI configuration for multiple TRPs in a high-speed, single-frequency network scenario. To illustrate such a possible technique, Figure 7 is a signal flow diagram illustrating a method for performing CORESET TCI configuration in a high-speed, single-frequency network scenario in a wireless communication system, according to at least some embodiments.

[0117] Aspects of the method of FIG. 7 may be implemented by a wireless device, such as UE(s) 106, in communication with one or more base stations (e.g., BS 102) as shown in and described with respect to the figure, or more generally, in conjunction with any of the circuits, systems, devices, elements, or components shown in the figure, or any of the computer systems or devices shown in the figure, among other devices, as appropriate. For example, one or more processors (or processing elements) of the UE (e.g., processor(s) 402, baseband processor(s), processor(s) associated with the communications circuitry, etc., among various possibilities) may cause the UE to perform some or all of the method elements shown in the figure. While at least some elements of the method are described in connection with the use of communications techniques and / or features associated with 3GPP specification documents, it should be noted that such description is not intended to limit the present disclosure, and aspects of the method may be used in any suitable wireless communication system, as desired. In various embodiments, some of the method elements shown in the figures may be performed simultaneously, may be performed in a different order than shown in the figures, may be replaced by other method elements, or may be omitted. Additional method elements may be performed as desired. As shown in the figures, the method may operate as follows.

[0118] At 702, the wireless device may establish a cellular link with a cellular network. The cellular link may operate according to a single frequency network (SFN) scheme. In some cases, the SFN scheme may be, more particularly, a high-speed train (HST) SFN scheme, which may be used to provide service to wireless devices traveling on high-speed trains. According to some embodiments, the cellular link may operate according to 5G NR. For example, the wireless device may establish a session with an AMF entity of the cellular network via one or more gNBs that provide wireless access to the cellular network. As another possibility, the cellular link may operate according to LTE. For example, the wireless device may establish a session with a mobility management entity of the cellular network via an eNB that provides wireless access to the cellular network. Other types of cellular links are possible, and the cellular network may additionally or alternatively operate according to another cellular communication technology (e.g., UMTS, CDMA2000, GSM, etc.) according to various embodiments.

[0119] Establishing the radio link may include, according to at least some embodiments, establishing an RRC connection with a serving cellular base station. Establishing a first RRC connection may include configuring various parameters for communication between the wireless device and the cellular base station, establishing context information for the wireless device, and / or any of various other possible features related to, for example, establishing an air interface for the wireless device to perform cellular communication with a cellular network associated with the cellular base station. After establishing the RRC connection, the wireless device may operate in an RRC connected state. In some instances, the RRC connection may also be released (e.g., after a certain inactivity period with respect to data communication), in which case the wireless device may operate in an RRC idle state or an RRC inactive state. In some instances, the wireless device may perform a handover (e.g., while in an RRC connected mode) or perform cell reselection to a new serving cell (e.g., in an RRC idle or RRC inactive mode) due to wireless device mobility and / or any of various other possible reasons that change wireless medium conditions.

[0120] According to at least some embodiments, a wireless device may establish multiple radio links with, for example, multiple TRPs of a cellular network according to a multi-TRP configuration. In such a scenario, the wireless device may be configured (e.g., via RRC signaling) with one or more transmission configuration indicators (TCIs) that may correspond to, for example, different beams that may be used to communicate with the TRPs. Furthermore, one or more configured TCI states may be activated by a medium access control (MAC) control element (CE) of the wireless device at a particular time.

[0121] In at least some instances, establishing the wireless link(s) may include the wireless device providing wireless device capability information. Such capability information may include information related to any of various types of wireless device capabilities.

[0122] At 704, the network may determine one or more CORESET TCI states for configuring the UE for communication with multiple TRPs (e.g., at least a first and second TRP of the network). For example, the network may determine that all CORESETs within the same active bandwidth portion (BWP) of a component carrier (CC) should be configured to have a single TCI state to enable a UE to communicate with multiple TRPs or to perform its sample buffering or channel measurements more efficiently. Additionally or alternatively, the network may determine that all CORESETs within the same active BWP of a CC should be configured to have two TCI states. According to some embodiments, a BS (e.g., a network) can configure some CORESETs with one TCI state and other / additional CORESETs (within the same active BWP of a CC) with two TCI states.

[0123] According to some embodiments, a cellular network (e.g., a cellular base station configured to provide one or more TRPs in the cellular network) may receive signaling from a wireless device (e.g., user equipment) including measurement information corresponding to a first and a second TRP of the network. Additionally or alternatively, the measurement information may include Doppler shift measurement information corresponding to a first and a second TRP of the network. For example, due to the UE moving at high speed and utilizing a single-frequency network, the UE may measure a higher or positive Doppler shift measurement from one TRP and a lower or negative Doppler shift measurement from another TRP. Therefore, to facilitate a better connection with the network, the UE may choose to transmit this information to the network. In some embodiments, the UE may further indicate its CORESET TCI configuration capability. For example, the UE may indicate whether it supports CORESET with one TCI state or CORESET with two TCI states. Additionally or alternatively, according to some embodiments, the UE may indicate support for a mixed configuration of CORESET with one and / or two TCI states.

[0124] More specifically, in the example of received measurement information including Doppler shift measurement information, when the UE reports a high Doppler shift measurement result, the network may determine that it should configure two TCI states for CORESET to compensate for the measured high Doppler shift. Additionally or alternatively, if the UE reports low-to-medium Doppler shift measurement information, the network may configure one TCI state for CORESET. In some embodiments, if the UE reports that it does not support two TCI states for CORESET, the network may configure a single TCI state for CORESET. Additionally or alternatively, the network may configure two TCI states for CORESET.

[0125] At 706, the network may send signaling to the cellular device (e.g., UE) to configure the cellular device with the determined CORESET TCI state. Thus, according to some embodiments, the UE may be configured with the determined CORESET TCI state corresponding to each of a plurality of TRPs for use in subsequent communications, sample buffering, and / or channel measurements. FIG. 8 illustrates a method for determining a default beam for PDSCH and / or AP-CSI-RS in a high-speed single-frequency network.

[0126] According to at least some embodiments, other possible areas where such use of multiple beams may be implemented include determining a default beam for PDSCH and / or AP-CSI-RS in high-speed single-frequency networks, potentially improving communication reliability, and / or providing other possible benefits.

[0127] Therefore, in at least some instances, it may be beneficial to specify techniques for determining a default beam for PDSCH and / or AP-CSI-RS for communication with multiple TRPs in a high-speed single-frequency network scenario. To illustrate such a possible technique, Figure 8 is a signal flow diagram illustrating a method for performing such determination of a default beam for PDSCH and / or AP-CSI-RS in a high-speed single-frequency network scenario in a wireless communication system, according to at least some embodiments.

[0128] Aspects of the method of FIG. 8 may be implemented by a wireless device, such as UE(s) 106, in communication with one or more base stations (e.g., BS 102) as shown in and described with respect to the figure, or more generally, in conjunction with any of the circuits, systems, devices, elements, or components shown in the figure, or any of the computer systems or devices shown in the figure, among other devices, as appropriate. For example, one or more processors (or processing elements) of the UE (e.g., processor(s) 402, baseband processor(s), processor(s) associated with the communications circuitry, etc., among various possibilities) may cause the UE to perform some or all of the method elements shown in the figure. While at least some elements of the method are described in connection with the use of communications techniques and / or features associated with 3GPP specification documents, it should be noted that such description is not intended to limit the present disclosure, and aspects of the method may be used in any suitable wireless communication system, as desired. In various embodiments, some of the method elements shown in the figures may be performed simultaneously, may be performed in a different order than shown in the figures, may be replaced by other method elements, or may be omitted. Additional method elements may be performed as desired. As shown in the figures, the method may operate as follows.

[0129] At 802, the wireless device may establish a cellular link with a cellular network. The cellular link may operate according to a single frequency network (SFN) scheme. In some cases, the SFN scheme may be, more particularly, a high-speed train (HST) SFN scheme, which may be used to provide service to wireless devices traveling on high-speed trains. According to some embodiments, the cellular link may operate according to 5G NR. For example, the wireless device may establish a session with an AMF entity of the cellular network via one or more gNBs that provide wireless access to the cellular network. As another possibility, the cellular link may operate according to LTE. For example, the wireless device may establish a session with a mobility management entity of the cellular network via an eNB that provides wireless access to the cellular network. Other types of cellular links are possible, and the cellular network may additionally or alternatively operate according to another cellular communication technology (e.g., UMTS, CDMA2000, GSM, etc.) according to various embodiments.

[0130] Establishing the radio link may include, according to at least some embodiments, establishing an RRC connection with a serving cellular base station. Establishing a first RRC connection may include configuring various parameters for communication between the wireless device and the cellular base station, establishing context information for the wireless device, and / or any of various other possible features related to, for example, establishing an air interface for the wireless device to perform cellular communication with a cellular network associated with the cellular base station. After establishing the RRC connection, the wireless device may operate in an RRC connected state. In some instances, the RRC connection may also be released (e.g., after a certain inactivity period with respect to data communication), in which case the wireless device may operate in an RRC idle state or an RRC inactive state. In some instances, the wireless device may perform a handover (e.g., while in an RRC connected mode) or perform cell reselection to a new serving cell (e.g., in an RRC idle or RRC inactive mode) due to wireless device mobility and / or any of various other possible reasons that change wireless medium conditions.

[0131] According to at least some embodiments, a wireless device may establish multiple wireless links, e.g., with multiple TRPs of a cellular network, according to a multi-TRP configuration. In such a scenario, the wireless device may be configured (e.g., via RRC signaling) with one or more transmission configuration indicators (TCIs), which may correspond to, e.g., different beams that may be used to communicate with the TRPs. Furthermore, one or more configured TCI states may be activated by a media access control (MAC) control element (CE) of the wireless device at a particular time. In at least some instances, establishing the wireless link(s) may include the wireless device providing wireless device capability information. Such capability information may include information related to any of various types of wireless device capabilities.

[0132] At 804, the UE may transmit signaling to the network including measurement information corresponding to the first and second TRPs of the network. For example, because the UE is moving at high speed and utilizing a single-frequency network, the UE may be performing channel measurements or other communications (e.g., sample buffering) with the TRPs. Therefore, to facilitate better connection with the network, the UE may choose to transmit this information to the network. In some embodiments, the UE may further indicate its CORESET TCI configuration capabilities. For example, the UE may indicate whether it supports CORESET with one TCI state or CORESET with two TCI states. Additionally or alternatively, according to some embodiments, the UE may indicate support for a mixed configuration of CORESET with one and / or two TCI states.

[0133] According to some embodiments, the measurement information may include Doppler shift measurement information. For example, due to the UE moving at high speed and utilizing a single frequency network, the UE may measure a higher or positive Doppler shift measurement from one TRP and a lower or negative Doppler shift measurement from another TRP. Therefore, to facilitate better connection with the network, the UE may choose to transmit this information to the network.

[0134] At 806, the UE may receive signaling from the network indicating a CORESET TCI state configuration for the UE to interwork with multiple TRPs (e.g., first and second TRPs) of the network. For example, the UE may receive signaling from a base station (BS) of the network indicating one or more transmission configuration indicator (TCI) state configurations that the UE will utilize for communication with multiple TRPs (e.g., first and second TRPs through which the UE may be moving at high speeds) operating according to a single frequency network. In some embodiments, the network may have determined the CORESET TCI state configuration based on received Doppler shift measurements reported by the UE. According to some embodiments, the UE may also have previously indicated to the base station whether it supports CORESET with one TCI state or CORESET with two TCI states. Additionally or alternatively, according to some embodiments, the UE may have indicated that it supports a mixed configuration of CORESET with one and / or two TCI states. Thus, the BS may determine that all CORESETs within the same active bandwidth portion (BWP) of a component carrier (CC) should be configured to have a single TCI state. Additionally or alternatively, the network may determine that all CORESETs within the same active BWP of a CC should be configured to have two TCI states. According to some embodiments, the BS (e.g., network) may configure some CORESETs with one TCI state and other / additional CORESETs (within the same active BWP of a CC) with two TCI states.

[0135] At 808, the UE may select one or more default beams to interact with (e.g., communicate with and / or perform channel measurements on) multiple TRPs (e.g., first and second TRPs) of the SFN based on the received CORESET TCI state configuration. For example, the UE may utilize a default beam to perform channel measurements on one or more TRPs of the high-speed SFN. In some embodiments, when the high-speed SFN is not configured to support a physical downlink control channel (PDCCH) but is configured to support a physical downlink shared channel (PDSCH), one or more default beams may be selected to perform subsequent communications using the PDSCH, according to some embodiments. In some embodiments, the PDSCH default beam may be determined by the TCI codepoint with the lowest index that includes two TCI states (among the TCI codepoints activated for PDSCH reception). Additionally or alternatively, the PDSCH default beam may be determined by the CORESET with the lowest ID in the latest slot in which the UE monitors the PDCCH. According to some embodiments, the PDSCH default beam may be determined by the TCI codepoint with the lowest index that contains one TCI state (among the activated TCI codepoints for PDSCH reception). In some embodiments, the PDSCH default beam may be determined by the CORESET with the lowest ID and the second lowest ID (if any) in the latest slot in which the UE monitors the PDCCH.

[0136] At 808, the UE performs communication / channel measurements for multiple TRPs using one or more selected default beams. For example, the UE may perform communication with multiple TRPs (e.g., networks) through the use of a supported PDSCH. Additionally or alternatively, the UE may use the selected one or more default beams to perform channel estimation related to AP-CSI-RS of the multiple TRPs. In other words, the UE can perform subsequent communication with the network using the selected default beams.

[0137] It should be noted that while the various embodiments described herein may relate to 5G / NR, they may also be extended to any set of wireless communications including LTE, GSM, CDMA, etc.

[0138] Embodiments of the present disclosure may be implemented in any of a variety of forms. For example, some embodiments may be implemented as a computer-implemented method, a computer-readable memory medium, or a computer system. Other embodiments may be implemented using one or more custom-designed hardware devices, such as an ASIC. Still other embodiments may be implemented using one or more programmable hardware elements, such as an FPGA.

[0139] In some embodiments, a non-transitory computer-readable memory medium may be configured to store program instructions and / or data that, when executed by a computer system, cause the computer system to perform the method, e.g., any of the method embodiments described herein, or a combination of the method embodiments described herein, or a subset of the method embodiments described herein, or a combination of such subsets.

[0140] In some embodiments, a device (e.g., UE 106) may be configured to include a processor (or set of processors) and a memory medium, where the memory medium stores program instructions and the processor is configured to read and execute the program instructions from the memory medium. The program instructions are executable to perform any of the various method embodiments described herein (or any combination of the method embodiments described herein, or any subset of any of the method embodiments described herein, or any combination of such subsets). The device may be embodied in any of a variety of forms.

[0141] It is understood that use of personally identifiable information should comply with generally recognized privacy policies and practices that meet or exceed industry or government requirements for maintaining user privacy. In particular, personally identifiable information data should be managed and handled in a manner that minimizes the risk of unintended or unauthorized access or use, and the nature of permitted uses should be clearly indicated to users.

[0142] Although the above embodiments have been described in considerable detail, numerous variations and modifications will become apparent to those skilled in the art once the above disclosure is fully appreciated, and it is intended that the following claims be interpreted to embrace all such variations and modifications.

Claims

1. 1. A method comprising: receiving signaling indicating whether one or more enhanced physical downlink shared channel (PDSCH) default beam capabilities are supported; configuring a user equipment (UE) for a single frequency network (SFN) PDSCH scheme and a SFN physical downlink control channel (PDCCH) scheme, wherein in response to the signaling not indicating support for the one or more PDSCH default beam capabilities, the method: Configuring a transmission configuration indicator (TCI) in a non-fallback downlink control information (DCI) format to schedule a corresponding PDSCH according to the SFN PDSCH scheme; and transmitting a DCI format that schedules the corresponding PDSCH according to the SFN PDSCH scheme.

2. When the signaling indicates support for the one or more enhanced PDSCH default beam capabilities, the method further comprises:

10. The method of claim 1, further comprising determining a default beam for the corresponding PDSCH.

3. When the signaling indicates support for the one or more enhanced PDSCH default beam capabilities, the method further comprises: The method of claim 1 , further comprising: refraining from configuring the TCI in the non-fallback DCI format that schedules the corresponding PDSCH in accordance with the SFN PDSCH scheme.

4. The method of claim 1 , wherein the timing offset between the DCIs for scheduling corresponding PDSCHs according to the SFN PDSCH scheme is equal to or greater than a parameter timeDurationForQCL.

5. The method of claim 1 , wherein the non-fallback DCI formats include DCI formats 1_1 and 1_2.

6. the one or more default beams the TCI codepoint activated for the PDSCH with the lowest index that contains two TCI states; a control resource set (CORESET) configured with the one or more TCI states and having the lowest identifier (ID) in the last slot monitored by the UE on a PDCCH; the activated TCI codepoint for the PDSCH with the lowest index containing one TCI state, or The method of claim 1 , wherein the one or more TCI states are configured and selected according to a CORESET having the lowest ID and the second-lowest ID in the last slot monitored by the UE on a PDCCH.

7. 2. The method of claim 1, further comprising: determining a default beam for an aperiodic channel state information reference signal (AP CSI-RS) when a time offset between the reception of a corresponding DCI and the AP-CSI-RS is less than a parameter; the determined default beam is in accordance with a TCI of a control resource set (CORESET) having the lowest ID in a latest slot in which a UE monitors the PDCCH; and when the CORESET has two TCI states, the first TCI state is used, and the parameter is beamSwitchTiming.

8. 1. A method comprising: transmitting signaling to a base station (BS) indicating whether one or more enhanced physical downlink shared channel (PDSCH) default beam capabilities are supported; receiving a configuration of a single frequency network (SFN) PDSCH scheme and a SFN physical downlink control channel (PDCCH) scheme; and in response to the signaling not indicating support for the one or more enhanced PDSCH default beam capabilities, the method: receiving a transmission configuration indication (TCI) configuration in a non-fallback downlink control information (DCI) format for scheduling a corresponding PDSCH according to the SFN PDSCH scheme; receiving a DCI format that schedules the corresponding PDSCH according to the SFN PDSCH configuration.

9. The method comprises: The method of claim 8 , further comprising selecting a default beam for the corresponding PDSCH.

10. The method of claim 8 , wherein the timing offset between the DCIs for scheduling the corresponding PDSCHs according to the SFN PDSCH scheme is equal to or greater than a parameter timeDurationForQCL.

11. One or more default beams the TCI codepoint activated for the PDSCH with the lowest index that contains two TCI states; a CORESET configured with the one or more TCI states and having the lowest ID in the last slot monitored by the UE on a PDCCH; the activated TCI codepoint for the PDSCH with the lowest index containing one TCI state, or 9. The method of claim 8, wherein the one or more TCI states are configured and selected according to a CORESET having the lowest ID and the second lowest ID in the last slot monitored by the UE on a PDCCH.

12. The method of claim 8 , wherein the non-fallback DCI formats include DCI formats 1_1 and 1_2.

13. 9. The method of claim 8, wherein the SFN is configured to support at least one of one or more Physical Downlink Control Channels (PDCCHs) and one or more Physical Downlink Shared Channels (PDSCHs).

14. 9. The method of claim 8, further comprising: selecting a default beam for an aperiodic channel state information reference signal (AP CSI-RS) when a time offset between the reception of a corresponding DCI and the AP-CSI-RS is less than a parameter, wherein the selected default beam is in accordance with a TCI of a control resource set (CORESET) having the lowest ID in a latest slot in which a UE monitors the PDCCH, and when the CORESET has two TCI states, the first TCI state is used, and the parameter is beamSwitchTiming.

15. 10. The method of claim 8, further comprising: performing communication using one or more default beams corresponding to at least one of the one or more aperiodic channel state information reference signals (AP-CSI-RS).

16. 16. The method of claim 15, wherein a timing offset between the DCI that triggers the one or more AP-CSI-RSs and the corresponding one or more AP-CSI-RSs is less than a parameter beamSwitchTiming.

17. 16. The method of claim 15, further comprising selecting one or more control resource set (CORESET) transmission configuration indication (TCI) state configurations based on one or more implementations of a user equipment (UE).

18. 16. The method of claim 15, further comprising transmitting signaling to the BS including an indication of one or more transmission configuration indicators (TCIs) or default beam capabilities of a user equipment (UE).

19. 1. A baseband processor, comprising: A baseband processor comprising a memory having instructions stored thereon, said instructions, when executed by the baseband processor, causing the processor to perform the steps of the method of any one of claims 1 to 18.

20. A memory medium storing program instructions which, when executed by one or more processors, perform the steps of the method of any one of claims 1 to 18.

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