Methods for event-triggered beam management procedure to enable fast beam update in wireless communication
UE-initiated, event-triggered beam management procedures using the TCI framework address the overhead and latency issues in wireless communication by allowing timely and efficient beam updates based on defined events, reducing signaling and maintaining optimal beam alignment.
Patent Information
- Application Number
- PCT/CN2024/086144
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-04-04
- Publication Date
- 2025-10-09
AI Technical Summary
Existing wireless communication systems face challenges with high uplink and control signaling overhead due to frequent periodic or semi-persistent beam reporting, leading to performance degradation when beam reporting is outdated, while infrequent reporting fails to ensure timely acquisition of preferred beams.
Implementing UE-initiated, event-triggered beam management procedures using the unified Transmission Configuration Indicator (TCI) framework, leveraging legacy Channel State Indicator (CSI) measurement and reporting configurations, to facilitate timely and reduced overhead beam switching through defined events and conditions.
Reduces signaling overhead and latency by enabling timely beam updates only when necessary, ensuring more accurate beam reporting and minimizing unnecessary beam switching.
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Figure CN2024086144_09102025_PF_FP_ABST
Abstract
Description
Methods for Event-Triggered Beam Management Procedure to Enable Fast Beam Update in Wireless CommunicationFIELD
[0001] The present application relates to wireless devices and wireless networks including devices, computer-readable media, and methods for User Equipment (UE) -initiated event-triggered beam reporting to facilitate fast beam switching.BACKGROUND
[0002] Wireless communication systems are rapidly growing in usage. In recent years, wireless devices such as smart phones and tablet computers have become increasingly sophisticated. In addition to supporting telephone calls, many mobile devices now provide access to the internet, email, text messaging, and navigation using the global positioning system (GPS) and are capable of operating sophisticated applications that utilize these functionalities. Additionally, there exist numerous different wireless communication technologies and standards. Some examples of wireless communication standards include GSM, UMTS (associated with, for example, 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) , BLUETOOTHTM, 5G New Radio (NR) , etc.
[0003] The ever-increasing number of features and functionality introduced in wireless communication devices also creates a continuous need for improvement in both the wireless communications and the wireless communication devices.
[0004] In beam management procedures, the network typically configures frequent periodic or semi-persistent beam reporting (e.g., N best beams and the corresponding Layer 1-Reference Signal Received Power (L1-RSRPs) ) or the network triggers frequent aperiodic beam reporting to timely acquire a preferred beam for data / control transmissions. However, such procedures can result in a large uplink (UL) reporting overhead and control signaling overhead. On the other hand, if less frequent beam reporting is configured, the network may not always acquire the preferred beams because the beam reporting by the UE is outdated, leading to performance degradation.
[0005] Given that the UE has better and more-timely knowledge of beam quality changes, UE-initiated beam reporting (UIBR) procedures can lead to more timely beam reports while reducing signal overhead.SUMMARY
[0006] In general, embodiments disclosed herein are directed to methods and devices to facilitate UE-initiated, event-triggered beam management procedures for reducing overhead and / or latency. Embodiments use the unified Transmission Configuration Indicator (TCI) framework, while leveraging legacy Channel State Indicator (CSI) measurement and reporting configuration frameworks. Embodiments are generally directed to signaling procedures and payloads for UE-initiated event driven beam reporting for fast beam switching.
[0007] In one aspect, embodiments are directed to a method performed by a UE for a UIBR procedure that includes the UE receiving a set of configurations for UE initiated beam reporting using a Physical Uplink Control Channel (PUCCH) resource and performing UE-initiated beam measurements on one or more measurement resources transmitted by network using different beams. The method includes the UE evaluating and determining an event of a set of events defined for the UIBR procedure has occurred based on the measurement results on the one or more measurement resources and transmitting a report on the PUCCH resource to the network when one or more events have occurred based on the measurement results evaluation.
[0008] The one or more measurement resources may include measurement resources that are transmitted in a single cell (i.e., intra-cell) or multiple cells (i.e., inter-cell) . In some embodiments, the set of events may be defined and configured through Radio Resource Control (RRC) signaling. In some embodiments, a mapping is established between the set of events and the PUCCH resources.
[0009] In some embodiments, the UE transmits Event Notification-Uplink Control Information (EN-UCI) as the report on the PUCCH resource and the EN-UCI payload includes a set of codepoints that maps to the events.
[0010] In some embodiments, the UE receives a network response associated with the transmitted report that includes downlink control information (DCI) that triggers an aperiodic CSI report and a configuration of the CSI report triggered by the DCI. The DCI includes a set of information elements (IEs) corresponding to the event indicated in the transmitted report on the PUCCH resource. The configuration of the triggered CSI report may include IEs corresponding to a CSI measurement resource set, group based reporting indicator and report quality indicator.
[0011] In some embodiments, the report includes an indication field used to indicate whether TCI states that are configured to use a reported Reference Signal (RS) as a Quasi Co Location (QCL) source RS are activated at the UE. The method may further include performing early timing offset and frequency offset tracking on the RS signal that is reported if the indication field is set to a predefined value.
[0012] In some embodiments, the report includes TCI states that are configured to use a RS reported with the highest Reference Signal Received Power (RSRP) values activated by the UE.The number of TCI states that are activated by the UE is indicated by a UE capability report. The method includes the UE using the RS for timing offset and frequency offset tracking.
[0013] The techniques described herein may be implemented in and / or used with a number of different types of devices, including but not limited to cellular phones, wireless devices, tablet computers, wearable computing devices, portable media players, and any of various 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 will be appreciated that the above-described features are merely examples and should not be construed to narrow the scope or spirit of the subject matter described herein in any way. Other features, aspects, and advantages of the subject matter described herein will become apparent from the following Detailed Description, Figures, and Claims.BRIEF DESCRIPTION OF DRAWINGS
[0015] A better understanding of the present subject matter can be obtained when the following detailed description of various aspects is considered in conjunction with the following drawings.
[0016] Figure 1 illustrates an example wireless communication system, according to some aspects.
[0017] Figure 2 illustrates an example block diagram of a UE, according to some aspects.
[0018] Figure 3 illustrates a base station (BS) in communication with a UE device, according to some aspects.
[0019] Figure 4 demonstrates a general method for an eventtriggered UIBR procedure according to some aspects.
[0020] Figure 5 illustrates a mapping of events to a signal report configuration according to some aspects.
[0021] Figure 6 demonstrates an event notification and response procedure according to some aspects.
[0022] While the features described herein may be susceptible to various modifications and alternative forms, specific aspects 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 thereto are not intended to be limiting to the particular form disclosed, but on the contrary, the intention is to cover all modifications, equivalents and alternatives falling within the spirit and scope of the subject matter as defined by the appended claims.DETAILED DESCRIPTION
[0023] As noted, a UE can have more timely knowledge of beam quality changes, so UIBR procedures can lead to more timely beam reports and reduce signal overhead. For UE-initiated beam reporting (UIBR) , embodiments herein define a limited set of events and the triggering conditions for such events to maximize the benefit of UIBR. Embodiments support multiple parallel events for different use case scenarios. An event may be generally defined and associated with a network reaction that occurs in response to the event or combination of events. To avoid overly repetitive beam switching, or ping-ponging, triggering conditions for starting and stopping the beam reporting are established.
[0024] Compared to network initiated beam reporting, the UIBR reporting procedures herein reduce signaling overhead because a report may only be sent when the UE discovers that it would be beneficial to update the TCI state. Accordingly, most reports will result in an updated TCI state being activated for the UE.
[0025] In addition, after receiving a TCI state activation command, the UE typically waits until it receives the next Signal Synchronization Block (SSB) that is associated with the TCI state in the activation command. That is, the TCI state can only be used by the network to transmit DL signals after the UE has received and processed the next occurrence of the SSB. For the UIBR procedures described herein, the TCI-state activation delay may be reduced by leveraging the sent beam measurement.
[0026] In embodiments described herein, a variety of approaches are presented to define one or more measurement reporting events, where each event is based on intra-cell or inter-cell beam measurement results derived based on SS / PBCH block or CSI-RS. Based on such events, a variety of approaches are presented to report the event at UE side and trigger the UIBR procedure. Embodiments may be applied to Frequence Range 2 (FR2) and single Transmission-Reception Points (sTRPs) using intra-cell and inter-cell beam management.
[0027] The following is a glossary of terms that may be used in this disclosure:
[0028] Memory Medium –Any of various types of non-transitory memory devices or storage devices. The term “memory medium” is intended to include an installation medium, e.g., a CD-ROM, floppy disks, or tape device; a computer system memory or random access memory such as DRAM, DDR RAM, SRAM, EDO RAM, Rambus RAM, etc.; a non-volatile memory such as a Flash, magnetic media, e.g., a hard drive, or optical storage; registers, or other similar types of memory elements, etc. The memory medium may include other types of non-transitory memory as well or combinations thereof. In addition, the memory medium may be located in a first computer system in which the programs are executed or may be located in a second different computer system which connects to the first computer system over a network, such as the Internet. In the latter instance, the second computer system may provide program instructions to the first computer for execution. The term “memory medium” may include two or more memory mediums which may reside in different locations, e.g., in different computer systems that are connected over a network. The memory medium may store program instructions (e.g., embodied as computer programs) that may be executed by one or more processors.
[0029] Carrier Medium –a memory medium as described above, as well as a physical transmission medium, such as a bus, network, and / or other physical transmission medium that conveys signals such as electrical, electromagnetic, or digital signals.
[0030] Programmable Hardware Element -includes various hardware devices comprising multiple programmable function blocks connected via a programmable interconnect. Examples include FPGAs (Field Programmable Gate Arrays) , PLDs (Programmable Logic Devices) , FPOAs (Field Programmable Object Arrays) , and CPLDs (Complex PLDs) . The programmable function blocks may range from fine grained (combinatorial logic or look up tables) to coarse grained (arithmetic logic units or processor cores) . A programmable hardware element may also be referred to as “reconfigurable logic. ”
[0031] Computer System –any of various types of computing or processing systems, including a personal computer system (PC) , mainframe computer system, workstation, network appliance, Internet appliance, personal digital assistant (PDA) , television system, grid computing system, or other device or combinations 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.
[0032] User Equipment (UE) (also “User Device” or “UE Device” ) –any of various types of computer systems or devices that are mobile or portable and that perform wireless communications. Examples of UE devices include mobile telephones or smart phones (e.g., iPhoneTM, AndroidTM-based phones) , portable gaming devices (e.g., Nintendo DSTM, PlayStation PortableTM, Gameboy AdvanceTM, iPhoneTM) , laptops, wearable devices (e.g., smart watch, smart glasses) , PDAs, portable Internet devices, music players, data storage devices, other handheld devices, in-vehicle infotainment (IVI) , in-car entertainment (ICE) devices, an instrument cluster, head-up display (HUD) devices, onboard diagnostic (OBD) devices, dashtop mobile equipment (DME) , mobile data terminals (MDTs) , Electronic Engine Management System (EEMS) , electronic / engine control units (ECUs) , electronic / engine control modules (ECMs) , embedded systems, microcontrollers, control modules, engine management systems (EMS) , networked or “smart” appliances, machine type communications (MTC) devices, machine-to-machine (M2M) , internet of things (IoT) devices, etc. In general, the term “UE” or “UE device” can be broadly defined to encompass any electronic, computing, and / or telecommunications device (or combination of devices) which is transportable by a user and capable of wireless communication.
[0033] Wireless Device –any of various types of computer systems or devices that perform wireless communications. A wireless device can be portable (or mobile) or may be stationary or fixed at a certain location. A UE is an example of a wireless device.
[0034] Communication Device –any of various types of computer systems or devices that perform communications, where the communications can be wired or wireless. A communication device can be portable (or mobile) or may be stationary or fixed at a certain location. A wireless device is an example of a communication device. A UE is another example of a communication device.
[0035] Base Station –The term “base station” or “wireless station” has the full breadth of its ordinary meaning, and at least includes a wireless communication station installed at a fixed location and used to communicate as part of a wireless telephone system or radio system. For example, if the base station is implemented in the context of LTE, it may alternately be referred to as an ‘eNodeB’ or ‘eNB. ’ If the base station is implemented in the context of 5G NR, it may alternately be referred to as a ‘gNodeB’ or ‘gNB’ . Although certain aspects are described in the context of LTE or 5G NR, references to “eNB, ” “gNB, ” “nodeB, ” “base station, ” “NB, ” etc., may refer to one or more wireless nodes that service a cell to provide a wireless connection between user devices and a wider network generally and that the concepts discussed are not limited to any particular wireless technology. Although certain aspects are described in the context of LTE or 5G NR, references to “eNB, ” “gNB, ” “nodeB, ” “base station, ” “NB, ” etc., are not intended to limit the concepts discussed herein to any particular wireless technology and the concepts discussed may be applied in any wireless system.
[0036] Node –The term “node, ” or “wireless node” as used herein, may refer to one more apparatus associated with a cell that provide a wireless connection between user devices and a wired network generally.
[0037] Processing Element (or Processor) –refers to various elements or combinations of elements that are capable of performing a function in a device, such as a user equipment or a cellular network device. Processing elements may include, for example: processors and associated memory, portions or circuits of individual processor cores, entire processor cores, individual processors, processor arrays, circuits such as an ASIC (Application Specific Integrated Circuit) , programmable hardware elements such as a field programmable gate array (FPGA) , as well any of various combinations of the above.
[0038] Channel -a medium used to convey information from a sender (transmitter) to a receiver. It should be noted that since characteristics of the term “channel” may differ according to different wireless protocols, the term “channel” as used herein may be considered as being used in a manner that is consistent with the standard of the type of device with reference to which the term is used. In some standards, channel widths may be variable (e.g., depending on device capability, band conditions, etc. ) . For example, LTE may support scalable channel bandwidths from 1.4 MHz to 20MHz. In contrast, WLAN channels may be 22MHz wide while Bluetooth channels may be 1Mhz wide. Other protocols and standards may include different definitions of channels. 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.
[0039] Band -The term “band” has the full breadth of its ordinary meaning, and at least includes a section of spectrum (e.g., radio frequency spectrum) in which channels are used or set aside for the same purpose.
[0040] Automatically –refers to an action or operation performed by a computer system (e.g., software executed by the computer system) or device (e.g., circuitry, programmable hardware elements, ASICs, etc. ) , without user input directly specifying or performing the action or operation. Thus, the term “automatically” is in contrast to an operation being manually performed or specified by the user, where the user provides input to directly perform the operation. An automatic procedure may be initiated by input provided by the user, but the subsequent actions that are performed “automatically” are not specified by the user, i.e., are not performed “manually, ” where the user specifies each action to perform. For example, a user filling out an electronic form by selecting each field and providing input specifying information (e.g., by typing information, selecting check boxes, radio selections, etc. ) is filling out the form manually, even though the computer system must update the form in response to the user actions. The form may be automatically filled out by the computer system where the computer system (e.g., software executing on the computer system) analyzes the fields of the form and fills in the form without any user input specifying the answers to the fields. As indicated above, the user may invoke the automatic filling of the form but is not involved in the actual filling of the form (e.g., the user is not manually specifying answers to fields but rather they are being automatically completed) . The present specification provides various examples of operations being automatically performed in response to actions the user has taken.
[0041] Approximately -refers to a value that is almost correct or exact. For example, approximately may refer to a value that is within 1 to 10 percent of the exact (or desired) value. It should be noted, however, that the actual threshold value (or tolerance) may be application dependent. For example, in some aspects, “approximately” may mean within 0.1%of some specified or desired value, while in various other aspects, the threshold may be, for example, 2%, 3%, 5%, and so forth, as desired, or as required by the particular application.
[0042] Concurrent –refers to parallel execution or performance, where tasks, processes, or programs are performed in an at least partially overlapping manner. For example, concurrency may be implemented using “strong” or strict parallelism, where tasks are performed (at least partially) in parallel on respective computational elements, or using “weak parallelism, ” where the tasks are performed in an interleaved manner, e.g., by time multiplexing of execution threads.
[0043] Configured to -Various components may be described as “configured to” perform a task or tasks. In such contexts, “configured to” is a broad recitation generally meaning “having structure that” performs the task or tasks during operation. As such, the component can be configured to perform the task even when the component is not currently performing that task (e.g., a set of electrical 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 recitation of structure generally meaning “having circuitry that” performs the task or tasks during operation. As such, the component can be configured to perform the task even when the component is not currently on. In general, the circuitry that forms the structure corresponding to “configured to” may include hardware circuits.
[0044] Various components may be described as performing a task or tasks, for convenience in the description. Such descriptions should be interpreted as including the phrase “configured to. ” Reciting a component that is configured to perform one or more tasks is expressly intended not to invoke 35 U.S.C. § 112 (f) interpretation for that component.
[0045] Example Wireless Communication System
[0046] Turning now to Figure 1, a simplified example of a wireless communication system is illustrated, according to some aspects. It is noted that the system of Figure 1 is a non-limiting example of a possible system, and that features of this disclosure may be implemented in any of various systems, as desired.
[0047] As shown, the example wireless communication system includes a base station 102A, which communicates over a transmission medium with one or more user devices 106A and 106B, through 106Z. Each of the user devices may be referred to herein as a “user equipment” (UE) . Thus, the user devices 106 are referred to as UEs or UE devices.
[0048] The base station (BS) 102A may be a base transceiver station (BTS) or cell site (e.g., a “cellular base station” ) and may include hardware that enables wireless communication with the UEs 106A through 106Z.
[0049] The communication area (or coverage area) of the base station may be referred to as a “cell. ” The base station 102A and the UEs 106 may be configured to communicate over the transmission medium using any of various radio access technologies (RATs) , also referred to as wireless communication technologies, or telecommunication standards, such as GSM, UMTS (associated with, for example, WCDMA or TD-SCDMA air interfaces) , LTE, LTE-A, 5G NR, HSPA, 3GPP2 CDMA2000. Note that if the base station 102A is implemented in the context of LTE, it may alternately 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 alternately be referred to as a ‘gNodeB’ or ‘gNB’ .
[0050] In some aspects, the UEs 106 may be IoT UEs, which may comprise a network access layer designed for low-power IoT applications utilizing short-lived UE connections. An IoT UE may utilize technologies such as M2M or MTC for exchanging data with an MTC server or device via a public land mobile network (PLMN) , proximity service (ProSe) or device-to-device (D2D) communication, sensor networks, or IoT networks. The M2M or MTC exchange of data may be a machine-initiated exchange of data. An IoT network describes interconnecting IoT UEs, which may include uniquely identifiable embedded computing devices (within the Internet infrastructure) , with short-lived connections. As an example, vehicles to everything (V2X) may utilize ProSe features using a PC5 interface for direct communications between devices. The IoT UEs may also execute background applications (e.g., keep-alive messages, status updates, and the like) to facilitate the connections of the IoT network.
[0051] As shown in Figure 1, the UEs 106, such as UE 106A and UE 106B, may directly exchange communication data via a PC5 interface 108A. Also, the UEs 106C, 106N, and 106Z, may collectively exchange communication data via a PC5 interfaces 108B, 108C, and 108D. In general, such PC5 interfaces are referred to as SL connections.
[0052] The PC5 interface 108 may comprise one or more physical channels, including but not limited to a Physical Sidelink Shared Channel (PSSCH) , a Physical Sidelink Control Channel (PSCCH) , a Physical Sidelink Broadcast Channel (PSBCH) , and a Physical Sidelink Feedback Channel (PSFCH) . The PC5 interface 108 may be responsible for direct communication between devices (unicast) , group messaging among select devices (groupcast) , and broadcast messaging in accordance with embodiments disclosed herein.
[0053] In V2X scenarios, one or more of the base stations 102 may be or act as Road Side Units (RSUs) . The term RSU may refer to any transportation infrastructure entity used for V2X communications. An RSU may be implemented in or by a suitable wireless node or a stationary (or relatively stationary) UE, where an RSU implemented in or by a UE , eNB, or by a gNB. For example, an RSU is a computing device coupled with radio frequency circuitry located on a roadside that provides connectivity support to passing vehicle UEs.
[0054] As shown, the base station 102A may also be equipped to communicate with a network 100 (e.g., a core network of a cellular service provider, a telecommunication network such as a public switched telephone network (PSTN) , and / or the Internet, among various possibilities) . Thus, the base station 102A may facilitate communication between the user devices and / or between the user devices and the network 100. In particular, the cellular base station 102A may provide UEs 106 with various telecommunication capabilities, such as voice, SMS and / or data services.
[0055] Base station 102A and other similar base stations (such as base stations 102B through 102N) operating according to the same or a different cellular communication standard may thus be provided as a network of cells, which may provide continuous or nearly continuous overlapping service to UEs 106A-106Z and similar devices over a geographic area via one or more cellular communication standards.
[0056] Thus, while base station 102A may act as a “serving cell” for UEs 106A-106Z as illustrated in Figure 1, each UE 106 may also be capable of receiving signals from (and possibly within communication range of) one or more other cells (which may be provided by base stations 102B-102Z and / or any other base stations) , which may be referred to as “neighboring cells. ” Such cells may also be capable of facilitating communication between user devices and / or between user devices and the network 100. Such cells may include “macro” cells, “micro” cells, “pico” cells, and / or cells which provide any of various other granularities of service area size. For example, base stations 102A and 102B illustrated in Figure 1 may be macro cells, while base station 102Z may be a micro cell. Other configurations are also possible.
[0057] In some aspects, base station 102A may be a next generation base station, (e.g., a 5G New Radio (5G NR) base station, or “gNB” ) . In some aspects, a gNB may be connected to a legacy evolved packet core (EPC) network and / or to a NR core (NRC) / 5G core (5GC) 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 within one or more gNBs. For example, it may be possible that that the base station 102A and one or more other base stations 102 support joint transmission, such that UE 106 may be able to receive transmissions from multiple base stations (and / or multiple TRPs provided by the same base station) . For example, as illustrated in Figure 1, both base station 102A and base station 102C are shown as serving UE 106A.
[0058] Note that a UE 106 may be capable of communicating using multiple wireless communication standards. For example, the UE 106 may be configured to communicate using a wireless networking (e.g., Wi-Fi) and / or peer-to-peer wireless communication protocol (e.g., Bluetooth, Wi-Fi peer-to-peer, and the like) in addition to some of the cellular communication protocols discussed herein. The UE 106 may also 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 broadcasting standards (e.g., ATSC-M / H) , and / or any other wireless communication protocol, if desired. Other combinations of wireless communication standards (including more than two wireless communication standards) are also possible.
[0059] In one or more embodiments, the UE 106 may be a device with cellular communication capability such as a mobile phone, a hand-held device, a computer, a laptop, a tablet, a smart watch, or other wearable device, or virtually any type of wireless device.
[0060] The UE 106 may include a processor (processing element) that is configured to execute program instructions stored in memory. The UE 106 may perform any of the method aspects described herein by executing such stored instructions. Alternatively, or in addition, the UE 106 may include a programmable hardware element such as an FPGA (field-programmable gate array) , an integrated circuit, and / or any of various other possible hardware components that are configured to perform (e.g., individually or in combination) any of the method aspects described herein, or any portion of any of the method aspects described herein.
[0061] The UE 106 may include one or more antennas for communicating using one or more wireless communication protocols or technologies. In some aspects, the UE 106 may be configured to communicate using, for example, NR or LTE using at least some shared radio components. As additional possibilities, the UE 106 could be configured to communicate using CDMA2000 (1xRTT / 1xEV-DO / HRPD / eHRPD) or LTE using a single shared radio and / or GSM or LTE using the single shared radio. The shared radio may couple to a single antenna, or may couple to multiple antennas (e.g., for a multiple-input multiple output (MIMO) configuration) for performing wireless communications. In general, a radio may include any combination of a baseband processor, analog RF signal processing circuitry (e.g., including filters, mixers, oscillators, amplifiers, and the like) , or digital processing circuitry (e.g., for digital modulation as well as other digital processing) . Similarly, the radio may implement one or more receive and transmit chains using the aforementioned hardware. For example, the UE 106 may share one or more parts of a receive and / or transmit chain between multiple wireless communication technologies, such as those discussed above.
[0062] In some aspects, the UE 106 may include separate transmit and / or receive chains (e.g., including separate antennas and other radio components) for each wireless communication protocol with which it is configured to communicate. As a further possibility, the UE 106 may include one or more radios which are shared between multiple wireless communication protocols, and one or more radios which are used exclusively by a single wireless communication protocol. For example, the UE 106 might include a shared radio for communicating using either of LTE or 5G NR (or either of LTE or 1xRTT, or either of LTE or GSM, among various possibilities) , and separate radios for communicating using each of Wi-Fi and Bluetooth. Other configurations are also possible.
[0063] In some aspects, a downlink resource grid may be used for downlink transmissions from any of the base stations 102 to the UEs 106, while uplink transmissions may utilize similar techniques. The grid may be a time-frequency grid, called a resource grid or time-frequency resource grid, which is the physical resource in the downlink in each slot. Such a time-frequency plane representation is a common practice for Orthogonal Frequency Division Multiplexing (OFDM) systems, which makes it intuitive for radio resource allocation. Each column and each row of the resource grid corresponds to one OFDM symbol and one OFDM subcarrier, respectively. The duration of the resource grid in the time domain corresponds to one slot in a radio frame. The smallest time-frequency unit in a resource grid is denoted as a resource element. Each resource grid may comprise a number of resource blocks, which describe the mapping of certain physical channels to resource elements. Each resource block comprises a set of resource elements. There are several different physical downlink channels that are conveyed using such resource blocks.
[0064] One such channel is the physical downlink shared channel (PDSCH) that may carry user data and higher layer signaling to the UEs 106. The Physical Downlink Control Channel (PDCCH) may carry information about the transport format and resource allocations related to the PDSCH channel, among other things. It may also inform the UEs 106 about the transport format, resource allocation, and HARQ (Hybrid Automatic Repeat Request) information related to the uplink shared channel. Typically, downlink scheduling (assigning control and shared channel resource blocks to the UE 102 within a cell) may be performed at any of the base stations 102 based on channel quality information fed back from any of the UEs 106. The downlink resource assignment information may be sent on the PDCCH used for (e.g., assigned to) each of the UEs.
[0065] The PDCCH may use control channel elements (CCEs) to convey the control information. Before being mapped to resource elements, the PDCCH complex-valued symbols may first be organized into quadruplets, which may then be permuted using a sub-block interleaver for rate matching. Each PDCCH may be transmitted using one or more of these CCEs, where each CCE may correspond to nine sets of four physical resource elements known as resource element groups (REGs) . Four Quadrature Phase Shift Keying (QPSK) symbols may be mapped to each REG. The PDCCH may be transmitted using one or more CCEs, depending on the size of the Downlink Control Information (DCI) and the channel condition. There may be four or more different PDCCH formats defined in LTE with different numbers of CCEs (e.g., aggregation level, L=1, 2, 4, or 8) .
[0066] Example Communication Device
[0067] Figure 2 illustrates user equipment 106 (e.g., one of the devices 106A through 106N) in communication with a base station 102 or other user equipment 106, according to some aspects. The UE 106 may be a device with cellular communication capability such as a mobile phone, a hand-held device, a computer, a laptop, a tablet, a smart watch, or other wearable device, or virtually any type of wireless device.
[0068] The UE 106 may include a processor (processing element) that is configured to execute program instructions stored in memory. The UE 106 may perform any of the method aspects described herein by executing such stored instructions. Alternatively, or in addition, the UE 106 may include a programmable hardware element such as an FPGA (field-programmable gate array) , an integrated circuit, and / or any of various other possible hardware components that are configured to perform (e.g., individually or in combination) any of the method aspects described herein, or any portion of any of the method aspects described herein.
[0069] The UE 106 may include one or more antennas for communicating using one or more wireless communication protocols or technologies. In some aspects, the UE 106 may be configured to communicate using, for example, NR or LTE using at least some shared radio components. As additional possibilities, the UE 106 could be configured to communicate using CDMA2000 (1xRTT / 1xEV-DO / HRPD / eHRPD) or LTE using a single shared radio and / or GSM or LTE using the single shared radio. The shared radio may couple to a single antenna, or may couple to multiple antennas (e.g., for MIMO) for performing wireless communications. 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 as well as other digital processing) . Similarly, the radio may implement one or more receive and transmit chains using the aforementioned hardware. For example, the UE 106 may share one or more parts of a receive and / or transmit chain between multiple wireless communication technologies, such as those discussed above.
[0070] In some aspects, the UE 106 may include separate transmit and / or receive chains (e.g., including separate antennas and other radio components) for each wireless communication protocol with which it is configured to communicate. As a further possibility, the UE 106 may include one or more radios which are shared between multiple wireless communication protocols, and one or more radios which are used exclusively by a single wireless communication protocol. For example, the UE 106 might include a shared radio for communicating using either of LTE or 5G NR (or either of LTE or 1xRTT, or either of LTE or GSM, among various possibilities) , and separate radios for communicating using each of Wi-Fi and Bluetooth. Other configurations are also possible.
[0071] In some aspects, a downlink resource grid can be used for downlink transmissions from any of the base stations 102 to the UEs 106, while uplink transmissions can utilize similar techniques. The grid can be a time-frequency grid, called a resource grid or time-frequency resource grid, which is the physical resource in the downlink in each slot. Such a time-frequency plane representation is a common practice for OFDM systems, which makes it intuitive for radio resource allocation. Each column and each row of the resource grid corresponds to one OFDM symbol and one OFDM subcarrier, respectively. The duration of the resource grid in the time domain corresponds to one slot in a radio frame. The smallest time-frequency unit in a resource grid is denoted as a resource element. Each resource grid may comprise a number of resource blocks, which describe the mapping of certain physical channels to resource elements. Each resource block comprises a collection of resource elements. There are several different physical downlink channels that are conveyed using such resource blocks.
[0072] The PDSCH may carry user data and higher layer signaling to the UEs 106. The PDCCH may carry information about the transport format and resource allocations related to the PDSCH channel, among other things. It may also inform the UEs 106 about the transport format, resource allocation, and H-ARQ (Hybrid Automatic Repeat Request) information related to the uplink shared channel. Typically, downlink scheduling (assigning control and shared channel resource blocks to the UE 102 within a cell) may be performed at any of the base stations 102 based on channel quality information fed back from any of the UEs 106. The downlink resource assignment information may be sent on the PDCCH used for (e.g., assigned to) each of the UEs.
[0073] The PDCCH may use control channel elements (CCEs) to convey the control information. Before being mapped to resource elements, the PDCCH complex-valued symbols may first be organized into quadruplets, which may then be permuted using a sub-block interleaver for rate matching. Each PDCCH may be transmitted using one or more of these CCEs, where each CCE may correspond to nine sets of four physical resource elements known as resource element groups (REGs) . Four Quadrature Phase Shift Keying (QPSK) symbols may be mapped to each REG. The PDCCH can be transmitted using one or more CCEs, depending on the size of the downlink control information (DCI) and the channel condition. There can be four or more different PDCCH formats defined in LTE with different numbers of CCEs (e.g., aggregation level, L=1, 2, 4, or 8) .
[0074] Figure 2 illustrates an example simplified block diagram of a communication device 106, according to some aspects. It is noted that the block diagram of the communication device of Figure 2 is only one example of a possible communication device. According to aspects, communication device 106 may be a user equipment (UE) device, a mobile device or mobile station, a wireless device or wireless 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, among other devices. As shown, the communication device 106 may include a set of components 200 configured to perform core functions. For example, this set of components may be implemented as a system on chip (SOC) , which may include portions for various purposes. Alternatively, this set of components 200 may be implemented as separate components or groups of components for the various purposes. The set of components 200 may be coupled (e.g., communicatively; directly or indirectly) to various other circuits of the communication device 106.
[0075] For example, the communication device 106 may include various types of memory (e.g., including NAND flash 210) , an input / output interface such as connector I / F 220 (e.g., for connecting to a computer system; dock; charging station; input devices, such as a microphone, camera, keyboard; output devices, such as speakers; etc. ) , the display 260, which may be integrated with or external to the communication device 106, and wireless communication circuitry 230 (e.g., for LTE, LTE-A, NR, UMTS, GSM, CDMA2000, Bluetooth, Wi-Fi, NFC, GPS, etc. ) . In some aspects, communication device 106 may include wired communication circuitry (not shown) , such as a network interface card, e.g., for Ethernet.
[0076] The wireless communication circuitry 230 may couple (e.g., communicatively; directly or indirectly) to one or more antennas, such as antenna (s) 335 as shown. The wireless communication circuitry 230 may include cellular communication circuitry and / or short to medium range wireless communication circuitry and 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.
[0077] In some aspects, as further described below, cellular communication circuitry 230 may include one or more receive chains (including and / or coupled to (e.g., communicatively; directly or indirectly) dedicated processors and / or radios) for multiple RATs (e.g., a first receive chain for LTE and a second receive chain for 5G NR) . In addition, in some aspects, cellular communication circuitry 230 may include a single transmit chain that may be switched between radios dedicated to specific RATs. For example, a first radio may be dedicated to a first RAT, e.g., LTE, and may be in communication with a dedicated receive chain and a transmit chain shared with a second radio. The second radio may be dedicated to a second RAT, e.g., 5G NR, and may be in communication with a dedicated receive chain and the shared transmit chain. In some aspects, the second RAT may operate at mmWave frequencies. As mmWave systems operate in higher frequencies than typically found in LTE systems, signals in the mmWave frequency range are heavily attenuated by environmental factors. To help address this attenuating, mmWave systems often utilize beamforming and include more antennas as compared LTE systems. These antennas may be organized into antenna arrays or panels made up of individual antenna elements. These antenna arrays may be coupled to the radio chains.
[0078] The communication device 106 may also include and / or be configured for use with one or more user interface elements. The user interface elements may include any of various elements, such as display 260 (which may be a touchscreen display) , a keyboard (which may be a discrete keyboard or may be implemented as part of a touchscreen display) , a mouse, a microphone and / or speakers, one or more cameras, one or more buttons, and / or any of various other elements capable of providing information to a user and / or receiving or interpreting user input.
[0079] The communication device 106 may further include one or more smart cards 245 that include SIM (Subscriber Identity Module) functionality, such as one or more UICC (s) (Universal Integrated Circuit Card (s) ) cards 245.
[0080] As shown, the SOC 200 may include processor (s) 202, which may execute program instructions for the communication device 106 and display circuitry 204, which may perform graphics processing and provide display signals to the display 260. The processor (s) 202 may also be coupled to memory management unit (MMU) 240, which may be configured to receive addresses from the processor (s) 202 and translate those addresses to locations in memory (e.g., memory 206, read only memory (ROM) 250, NAND flash memory 210) and / or to other circuits or devices, such as the display circuitry 204, wireless communication circuitry 230, connector I / F 220, and / or display 260. The MMU 240 may be configured to perform memory protection and page table translation or set up. In some aspects, the MMU 240 may be included as a portion of the processor (s) 202.
[0081] As noted above, the communication device 106 may be configured to communicate using wireless and / or wired communication circuitry. As described herein, the communication device 106 may include hardware and software components for implementing any of the various features and techniques described herein. The processor 202 of the communication device 106 may be configured to implement part or all of the features described herein, e.g., by executing program instructions stored on a memory medium (e.g., a non-transitory computer-readable memory medium) . Alternatively (or in addition) , processor 202 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) the processor 202 of the communication device 106, in conjunction with one or more of the other components 200, 204, 206, 210, 220, 230, 240, 245, 250, 260 may be configured to implement part or all of the features described herein.
[0082] In addition, as described herein, processor 202 may include one or more processing elements. Thus, processor 202 may include one or more integrated circuits (ICs) that are configured to perform the functions of processor 202. In addition, each integrated circuit may include circuitry (e.g., first circuitry, second circuitry, etc. ) configured to perform the functions of processor (s) 202.
[0083] Further, as described herein, wireless communication circuitry 230 may include one or more processing elements. In other words, one or more processing elements may be included in wireless communication circuitry 230. Thus, wireless communication circuitry 230 may include one or more integrated circuits (ICs) that are configured to perform the functions of wireless communication circuitry 230. In addition, each integrated circuit may include circuitry (e.g., first circuitry, second circuitry, etc. ) configured to perform the functions of wireless communication circuitry 230.
[0084] Example Base Station
[0085] Figure 3 illustrates an example block diagram of a base station 102, according to some aspects. It is noted that the base station of Figure 3 is merely one example of a possible base station. As shown, the base station 102 may include processor (s) 304 which may execute program instructions for the base station 102. The processor (s) 304 may also be coupled to memory management unit (MMU) 340, which may be configured to receive addresses from the processor (s) 304 and translate those addresses to locations in memory (e.g., memory 360 and read only memory (ROM) 350) or to other circuits or devices.
[0086] The base station 102 may include at least one network port 370. The network port 370 may be configured to couple to a telephone network and provide a plurality of devices, such as UE devices 106, access to the telephone network as described above in Figures 1 and 2.
[0087] The network port 370 (or an additional network port) may also or alternatively be configured to couple to a cellular network, e.g., a core network of a cellular service provider. The core network may provide mobility related services and / or other services to a plurality of devices, such as UE devices 106. In some cases, the network port 370 may couple to a telephone network via the core network, and / or the core network may provide a telephone network (e.g., among other UE devices serviced by the cellular service provider) .
[0088] In some aspects, base station 102 may be a next generation base station, e.g., a 5G New Radio (5G NR) base station, or “gNB. ” In such aspects, base station 102 may be connected to a legacy evolved packet core (EPC) network and / or to a NR core (NRC) / 5G core (5GC) network. In addition, 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 within one or more gNBs.
[0089] The base station 102 may include at least one antenna 334, and possibly multiple antennas. The at least one antenna 334 may be configured to operate as a wireless transceiver and may be further configured to communicate with UE devices 106 via radio 330. The antenna 334 communicates with the radio 330 via communication chain 332. Communication chain 332 may be a receive chain, a transmit chain or both. The radio 330 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.
[0090] The base station 102 may be configured to communicate wirelessly using multiple wireless communication standards. In some instances, 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, as one possibility, the base station 102 may include an LTE radio for performing communication according to LTE as well as a 5G NR radio for performing communication 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. When the base station 102 supports mmWave, the 5G NR radio may be coupled to one or more mmWave antenna arrays or panels. As another possibility, the base station 102 may include a multi-mode radio, which is capable of performing communications according to any of multiple wireless communication technologies (e.g., 5G NR and LTE, 5G NR and Wi-Fi, LTE and Wi-Fi, LTE and UMTS, LTE and CDMA2000, UMTS and GSM, etc. ) .
[0091] As described further subsequently herein, the BS 102 may include hardware and software components for implementing or supporting implementation of features described herein. The processor 304 of the base station 102 may be configured to implement or support implementation of part or all of the methods described herein, e.g., by executing program instructions stored on a memory medium (e.g., a non-transitory computer readable memory medium) . Alternatively, the processor 304 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 304 of the BS 102, in conjunction with one or more of the other components 330, 332, 334, 340, 350, 360, 370 may be configured to implement or support implementation of part or all of the features described herein.
[0092] In addition, as described herein, processor (s) 304 may include one or more processing elements. Thus, processor (s) 304 may include one or more integrated circuits (ICs) that are configured to perform the functions of processor (s) 304. In addition, each integrated circuit may include circuitry (e.g., first circuitry, second circuitry, etc. ) configured to perform the functions of processor (s) 304.
[0093] Further, as described herein, radio 330 may include one or more processing elements. Thus, radio 330 may include one or more integrated circuits (ICs) that are configured to perform the functions of radio 330. In addition, each integrated circuit may include circuitry (e.g., first circuitry, second circuitry, etc. ) configured to perform the functions of radio 330.
[0094] Event Definition for UIBR Procedures
[0095] In accordance with embodiments herein, a number of measurement reporting events may be defined. The events may be based on intra-cell and / or inter-cell beam measurement results derived from an SS / PBCH block or CSI-RS. The events may be defined in consideration of the measurement results, as well as appropriate network responses to the events.
[0096] The following provides an example of a set of different events that may be defined; however, embodiments are not limited to the specific events described below. Other events may be defined based on measurements obtained and an appropriate network response to such measurements.
[0097] For example, an event referred to herein as “Event U1” may be defined as detecting that a measurement result of the current serving beam is worse than an absolute threshold. The threshold may be configured by RRC signaling. Event U1 may include sub-events, such as an Event U1-1, where the UE requests for a ‘Tx beam refinement’ procedure to potentially change the transmission (Tx) beams at network side for the UE. A similar Event U1-2 may be defined, wherein the UE requests for a ‘Rx beam refinement’ procedure to possibly change the reception (Rx) beam at the UE side.
[0098] Event U1 may include another sub-event, Event U1-3, wherein the UE requests an uplink panel selection procedure. This sub-event could be applicable on the condition that the UE is configured with at least one CSI-ReportConfig that includes the higher layer parameter reportQuantity set to ‘cri-RSRP-Index' or 'ssb-Index-RSRP-Index. ’
[0099] Another event, Event U2, may also be defined for the measurement result of a new beam becoming greater than the current serving beam by an offset value. The offset value may be configured using RRC signaling, in accordance with certain embodiments.
[0100] Another event, Event U3, may also be defined for the measurement result of the current serving beam being worse than a first threshold, and the measurement result of at least one new beam is better than a second threshold. The first threshold and second threshold may also be configured using RRC signaling, in accordance with certain embodiments.
[0101] Another event, Event U4, may also be defined when the best pair of beams is changed and the UE requests an update to the beams. This event may be applicable on the condition that ‘groupBasedBeamReporting’ is configured in the UE for the UIBR procedure.
[0102] Event-Triggered UIBR Procedure
[0103] Figure 4 demonstrates a method 400 for an event-triggered UIBR procedure, according to some aspects. In Figure 4, the UE receives a set of configurations for using a PUCCH for UIBR in Step 410. In some embodiments, the UE is provided with a SchedulingRequestResourceConfig that includes a set of configurations for signal reporting in a PUCCH transmission. The signal reporting may use either PUCCH format 0 or PUCCH format 1.
[0104] Figure 5 illustrates a mapping of events 500 to a signal report configuration, according to some aspects. Figure 5 demonstrates that each event is associated with a signal reporting configuration. The mapping may be 1: 1; for example, like the mapping 502 of UIBR Event #1-1 to Signal Reporting (SR) Configuration 1 in Figure 5. In other embodiments, different events may be mapped to a signal report configuration as in the mapping 503 of UIBR Event #1-2 and UIBR Event #X to SR Configuration 2. The mapping may be provided to the UE through RRC signaling.
[0105] In some embodiments, UE-specific Event Notification-Uplink Control Information (EN-UCI) maybe introduced to report the events. With respect to Step 410 of Figure 4, RRC signaling may be used to provide a mapping of the codepoints of the EN-UCI payload to corresponding events. For the mapping, the payload size “N” may be determined based on the number of events configured for a given UE and associated with different codepoints, representing by ‘M, ’ where
[0106] In some embodiments, cell specific EN-UCI maybe used to report the events. In such embodiments, the mapping between codepoints of the EN-UCI payload and the events may be encoded into the operating specification of the network as shown in Table 1.
[0107] Table 1:
[0108] In Table 1, the payload size ‘K’ of the EN-UCI may be determined based on the maximum number of events supported by the UIBR procedure and associated with different codepoints representing ‘L’ , where
[0109] Returning to Figure 4, the UE performs UE-initiated beam measurements on one or more measurement resources transmitted by network using different beams in Step 420. The measurements may be performed in accordance with current measurement techniques in a TCI framework.
[0110] In Step 430, the UE evaluates and determines if an event of a set of events defined for UIBR procedure has occurred based on the measurement results on the one or more measurement resources. The UE evaluates the measurement results for a triggering condition for declaring the UIBR event.
[0111] In some embodiments, the UE may evaluate the measurement results for a triggering condition for declaring or reporting the UIBR event. For example, an event may be reported by counting an event instance indication from the lower layers to the MAC entity using parameter “Event_COUNTER. ” More specifically, when an event instance indication for a measurement set has been received from lower layers in the UE, the “Event_COUNTER” is incremented by 1. When the “Event_COUNTER” of the measurement set is greater than an “EventInstanceMaxCount, ” e.g., a counter value of 2 or 3, etc., the UE triggers a signal report or EN-UCI for the measurement set to indicate that the corresponding event (s) have been detected at UE side. In some embodiments, the “EventInstanceMaxCount” may be set to zero by RRC signaling to disable a counting operation for the event-triggering.
[0112] In Step 440, the UE transmits a report on the PUCCH resource to the network when one or more events have occurred based on the measurement results evaluation. The UE may continue transmitting on the PUCCH resources until a network response is received.
[0113] Network Response to UIBR Reporting
[0114] In accordance with embodiments, after transmitting the signal report or EN-UCI, the UE monitors a PDCCH for the network response defined for the event indicated by the SR or EN-UCI. If a network response associated with the event (s) is received, the UE may consider that the event notification procedure is successfully completed for this measurement set. Accordingly, the UE may stop future PUCCH transmissions of the signal report or EN-UCI and cancel the event notification on the measurement resource.
[0115] If the event notification is triggered and not cancelled, the UE may re-evaluate the condition of the events, and continue to transmit the signal report or UCI on the PUCCH.
[0116] As noted above, the network response may be considered when defining the events. In accordance with embodiments, the network response maybe defined for different events or event combinations. Continuing from the specific examples with the events U1 to U4 as defined above, the UE may receive triggering DCI that schedules an aperiodic CSI report with settings specific to the event.
[0117] For example, for a combined “Event U1-1 and Event U2” or an “Event U3” reporting, the network response triggering DCI includes a ‘CSI-ReportConfig’ with the higher layer parameter “reportQuantity” set to “cri-RSRP, ” “cri-SINR, ” “ssb-Index-RSRP, ” or “ssb Index-SINR” and the higher layer parameter “groupBasedBeamReporting” is set to “disabled. ” The higher layer parameter “repetition” in the associated CSI-RS resource set is set to “off. ”
[0118] For an “Event U1-2” reporting, the triggering DCI includes a “CSI-ReportConfig” with the higher layer parameter “reportQuantity” set to “None” and the higher layer parameter “groupBasedBeamReporting” is set to “disabled. ” The higher layer parameter “repetition” in the associated CSI-RS resource set is set to “on. ”
[0119] For an “Event U1-3” reporting, the triggering DCI includes a “CSI-ReportConfig” with the higher layer parameter “reportQuantity” set to “cri-RSRP-Index” or “ssb-Index-RSRP-Index” and the higher layer parameter “groupBasedBeamReporting” is set to “disabled. ” The higher layer parameter “repetition” in the associated CSI-RS resource set is set to “off. ”
[0120] For an “Event U4” reporting the triggering DCI includes a “CSI-ReportConfig” with the higher layer parameter “reportQuantity” set to “cri-RSRP, ” “cri-SINR, ” “ssb-Index-RSRP, ” or “ssb-Index SINR” and the higher layer parameter “groupBasedBeamReporting” is set to “enabled. ” The higher layer parameter “repetition” in the associated CSI-RS resource set is set to “off. ”
[0121] Table 2 associates the different network responses described above and the corresponding UIBR Events.
[0122] Table 2:
[0123] Figure 6 demonstrates an event notification and response procedure 600 according to some aspects. Figure 6 provides an example of an event declaration and notification procedure based on the SR or EN-UCI on PUCCH resource, as well as a network response. In Figure 6, opportunities for PUCCH resources 610 are shown. In this example, the UE determines at time t0 that an event has occurred. The determination may be made on lower layer indications 620 and the value of ‘Event_COUNTER. ’ In this example, the “EventInstanceMaxCount” is configured by RRC signaling to be set to a value of ‘2. ’
[0124] The UE determines the event has occurred at time t0 based on the value of the ‘Event_COUNTER’ compared to the “EventInstanceMaxCount” and the lower layer indications 620. The UE starts transmission using PUCCH 630 that carries the signal report or EN-UCI that declares the UIBR event to the network. The UE continues the PUCCH transmission until a network response 640 is received at time t1. As indicated above, the UE may consider the event notification successful when the network response is received. The UE stops transmitting the signal report or EN-UCI with the PUCCH resource 615 after time t1. The network response may be defined in terms of the different events, as explained above.
[0125] In accordance with embodiments herein, a new “early-tracking” IE may be introduced in the beam reporting. In such embodiments, the “early-tracking” IE is included for each reported RS resource or TCI-state included in the beam reporting. For example, a bit value of “1” may indicate that the TCI-state associated with the reported RS is already activated at the UE after the UIBR measurement. The TCI-state may be used for early timing offset / frequency offset (TO / FO) tracking. A value of “0” would indicate that the TCI-state associated with the reported RS is not activated and not used for TO / FO tracking.
[0126] Table 3 demonstrates the association for a fast beam update operation based on a 1-bit “early tracking” IE in a beam reporting of UIBR procedure.
[0127] Table 3:
[0128] In Table 3, two CSI-RS resources i.e., CSI RS #2 and CSI-RS #6 that are associated with exemplary TCI states TCI-State 5 and TCI-State 9, respectively, are reported in a beam reporting content of UIBR. The “early tracking” IE is set as “1” for CSI-RS #2 and “0” for CSI-RS #6. As such, the TCI-State 5 is already activated for the UE. Accordingly, the network may update the UE to use TCI-State 5 faster.
[0129] The beam application delay is defined as the number of symbols after the UE sends the HARQ-ACK for the DCI. With this IE, the beam application delay may be reduced compared to receiving a TCI-state from the network in accordance with current techniques.
[0130] In some current reporting / TCI framework procedures, the UE performs early tracking on a number of RS resources with the highest RSRP values in accordance with the UE capabilities. In such procedures, the “early-tracking” IE described above may not be necessary because it is known the UE is tracking the best resources according to the UE capability.
[0131] Embodiments disclosed herein advantageously provide procedures for UIBR that can reduce the signal overhead and provide faster beam transitions for the UE. Embodiments define an event framework and leverage that the UE has more-timely knowledge of beam quality changes. This allows the UE to transmit more timely reports to advantageously reduce the overhead, and readily switch to better resources to provide faster beam switching.
[0132] Aspects of the present disclosure may be realized in any of various forms. For example, some aspects may be realized as a computer-implemented method, a computer-readable memory medium, or a computer system. Other aspects may be realized using one or more custom-designed hardware devices such as ASICs. Still other aspects may be realized using one or more programmable hardware elements such as FPGAs.
[0133] In some aspects, a non-transitory computer-readable memory medium may be configured so that it stores program instructions and / or data, where the program instructions, if executed by a computer system, cause the computer system to perform a method, e.g., any of a method aspects described herein, or, any combination of the method aspects described herein, or, any subset of any of the method aspects described herein, or, any combination of such subsets.
[0134] In some aspects, a device (e.g., a UE 106, a BS 102) may be configured to include a processor (or a set of processors) and a memory medium, where the memory medium stores program instructions, where the processor is configured to read and execute the program instructions from the memory medium, where the program instructions are executable to implement any of the various method aspects described herein (or, any combination of the method aspects described herein, or, any subset of any of the method aspects described herein, or, any combination of such subsets) . The device may be realized in any of various forms.
[0135] Although the aspects above 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. It is intended that the following claims be interpreted to embrace all such variations and modifications.
Claims
1.A method performed by a User Equipment (UE) for a UE-initiated beam reporting (UIBR) procedure, the method comprising:receiving a set of configurations for UE initiated beam reporting using a Physical Uplink Control Channel (PUCCH) resource;performing UE-initiated beam measurements on one or more measurement resources transmitted by network using different beams;evaluating and determining an event of a set of events defined for the UIBR procedure has occurred based on the measurement results on the one or more measurement resources; andtransmitting a report on the PUCCH resource to the network when one or more events have occurred based on the measurement results evaluation.2.The method of claim 1, wherein the one or more measurement resources comprise measurement resources that are transmitted in a single cell (i.e., intra-cell) or multiple cells (i.e., inter-cell) .3.The method of claim 1, wherein the set of events comprises at least one of the following:a measurement result of a current serving beam is less than an absolute threshold;a measurement result of a new beam is greater than the current serving beam by an offset value;a measurement result of the current serving beam is less than a first threshold and a measurement result of a new beam is greater than a second threshold; anda measurement result indicates that a best pair of beams has changed.4.The method of claim 3, wherein the offset value, absolute threshold, first threshold, and second threshold are configured by Radio Resource Control (RRC) signaling.5.The method of claim 3, wherein the set of events further comprises at least one of the following:an indication of a request to network for initiating a procedure of transmission beam refinement to alter transmission beam (s) towards the UE;an indication of a request to network for initiating a procedure of reception beam refinement to alter reception beam at the UE; andan indication of a request to network for initiating a procedure of uplink panel selection.6.The method of claim 1, wherein determining the event has occurred is further based on an evaluation on the measurements results that are obtained by UE by measuring one or more measurement resources from different beams.7.The method of claim 1, wherein the PUCCH that is used to transmit a report is PUCCH format 0 or PUCCH format 1.8.The method of claim 1, wherein there is a one-to-one mapping between the set of PUCCH resources configured for reporting and the set of events.9.The method of claim 1, wherein transmitting the report comprises:transmitting an Event Notification-Uplink Control Information (EN-UCI) as the report on the PUCCH resource, wherein an EN-UCI payload comprises a set of codepoints and each codepoint maps to one or a combination of events.10.The method of claim 9, wherein Radio Resource Control (RRC) signaling is used to map the set of codepoints to a corresponding event or combinations of the events.11.The method of claim 9, wherein a number of bits of the EN-UCI payload is determined based on a maximum number of events supported by the UIBR procedure.12.The method of claim 1, wherein determining the event of the set of events has occurred at the UE comprises:resetting a corresponding event counter to 0 when measurement on a beam of a cell for an event evaluation is initiated at the UE;incrementing the event counter associated with the event that the UE is evaluating when the measurement result of a beam from a physical layer is equal or larger than a threshold configured by a Radio Resource Control (RRC) signal or is greater by an offset than that of the current serving beam; anddetermining that the event is triggered when the event counter is greater than or equal to a value of maximum number of counts configured by a second RRC signal for the event.13.The method of claim 12, wherein the value of maximum number of counts is set to zero.14.The method of claim 1, further comprising:receiving a network response associated with the event indicated in the transmitted report comprising an indication to cancel notification of the event; andstopping further transmissions on the PUCCH resource that is associated with the event after receiving the network response.15.The method of claim 1, further comprising:receiving a network response associated with the transmitted report;performing second beam measurements on the one or more measurement resources using beams that are configured in the received network response; andtransmit a beam report based on the second beam measurements operation.16.The method of claim 1, further comprising:receiving a network response associated with the transmitted report,wherein the network response comprises:downlink control information (DCI) that triggers an aperiodic CSI report and a configuration of a CSI report triggered by the DCI, the DCI comprising a set of information elements (IEs) corresponding to the event indicated in the transmitted report on the PUCCH resource.17.The method of claim 16, wherein the configuration of triggered CSI report comprises at least one of the following IEs corresponding to the triggered event: a CSI measurement resource set, a group-based reporting indicator, and a report quality indicator.18.The method of claim 1, wherein the report comprises an indication field used to indicate whether Transmission Configuration Indicator (TCI) states that are configured to use a reported Reference Signal (RS) as a Quasi Co Location (QCL) source RS are activated at the UE, and the method further comprises:performing early timing offset and frequency offset tracking on the RS signal that is reported if the indication field is set to a predefined value.19.The method of claim 1, the report further comprising Transmission Configuration Indicator (TCI) states that are configured to use a Reference Signal (RS) reported with a highest Reference Signal Received Power (RSRP) value that is activated by the UE, and the method further comprising using the RS for timing offset and frequency offset tracking, wherein a number of TCI states that are activated by the UE is indicated by a UE capability report.20.A wireless device configured to perform the methods of any of claims 1–19.21.A non-transitory computer readable medium configured to store and execute instructions to perform the methods of any of claims 1–19.22.A baseband processor configured to execute instructions to cause a wireless device to perform the methods of any of claims 1–19.
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