Methods for measurement resources and triggering events to enable UE-initiated measurement reporting in wireless communication
UE-initiated and event-driven beam management using the TCI framework addresses the slow beam updates in high-speed UEs, improving throughput performance by reducing latency and overhead in wireless communication systems.
Patent Information
- Application Number
- PCT/CN2024/076979
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-02-08
- Publication Date
- 2025-08-14
AI Technical Summary
Existing beam management procedures in wireless communication systems fail to provide fast enough updates for high-speed UEs, leading to throughput performance degradation due to rapid changes in the best transmission/reception beam.
Implement UE-initiated and/or event-driven beam management using the unified Transmission Configuration Indicator (TCI) framework, leveraging legacy Channel State Indicator (CSI) measurement and reporting configurations to facilitate quick beam reporting and resource determination.
Reduces latency and overhead in beam management, enhancing mobility robustness and reliability for high-speed UEs by enabling faster beam updates.
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Figure CN2024076979_14082025_PF_FP_ABST
Abstract
Description
Methods for Measurement Resources and Triggering Events to Enable UE-initiated Measurement Reporting in Wireless CommunicationFIELD
[0001] The present application relates to wireless devices and wireless networks including devices, computer-readable media, and methods to enable fast triggering and resource determination for UE-Initiated Beam Reporting (UIBR) .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. New mobile services that require low-latency and high reliability performance (e.g., Ultra-Reliable Low Latency Communications (URLLC) ) are emerging. While the 5G standard has been designed to address these services, the evolution of 5G NR needs to continuously enhance the mobility robustness performance for these challenging scenarios. For high-speed UEs, such as on a highway or high-speed train, the beam with the best transmission / reception changes rapidly. Existing beam management procedures may not provide appropriately fast beam updates, which can cause throughput performance degradation.SUMMARY
[0004] In general, embodiments disclosed herein are directed to methods and devices for fast triggering and resource determination for UE-Initiated Beam Reporting (UIBR) procedures. Embodiments herein disclose UE-initiated and / or event-driven beam management for reducing overhead and / or latency. Embodiments incorporate the unified Transmission Configuration Indicator (TCI) framework, while leveraging as much as possible the legacy Channel State Indicator (CSI) measurement and reporting configuration frameworks.
[0005] In one aspect, embodiments are directed to a method performed by a UE for a UIBR procedure that includes the UE receiving Radio Resource Control (RRC) signaling that include a configuration of a list of CSI resource sets. Each CSI resource set includes resources to be used by the UE for channel measurement in the UIBR procedure. The UE receives a Medium Access Control-Control Element (MAC-CE) indicating a CSI resource set from the list of CSI resource sets to be used by the UE for channel measurement. The MAC-CE is identified by a dedicated Logical Channel Identification (LCID) in a MAC subheader. The UE performs channel measurement using the CSI resource set indicated by the MAC-CE and transmits a CSI report based on the channel measurement on the CSI resource set indicated by the MAC-CE.
[0006] In embodiments, the MAC-CE may be a fixed or variable size. The CSI resource set may include Non-Zero-Power (NZP) CSI-Reference Signal (RS) resources or Synchronization Signal Block (SSB) resources to be used for measurement in the UIBR procedure.
[0007] In another aspect, embodiments are directed to a method performed by a UE for a UIBR procedure that includes the UE receiving RRC signaling that includes a configuration of a CSI resource set. The CSI resource set includes Reference Signals (RSs) to be used for channel measurement in a UIBR procedure for a serving cell. The UE receives a MAC-CE that updates the RSs in the CSI resource set. The UE performs channel measurement on at least one of the RSs in the CSI resource set that is updated by the MAC-CE and transmits a CSI-Report based on the channel measurement on the RSs updated by the MAC-CE.
[0008] In another aspect, embodiments are directed to a method performed by a UE for a UIBR procedure that includes the UE receiving RRC signaling indicating a configuration of a plurality of CSI resource sets for candidate cells in a cell group. The CSI resource sets include resources to be used by the UE for channel measurement in the UIBR procedure. The UE receives a CSI Resource Activation (CRA) field indicating a CSI resource from the plurality of CSI resource sets to be activated and used for channel measurement. The UE performs channel measurement using the CSI resources indicated by CRA field on one or more candidate cells and transmits a CSI-Report based on the channel measurement on the CSI resources activated by the CRA field. The CRA field may be received in Downlink Control Information (DCI) or a MAC-CE.
[0009] In another aspect, embodiments are directed to a method performed by a UE for a UIBR procedure that includes the UE receiving RRC signaling that includes a configuration of linking TCI-states on a plurality of candidate cells in a cell group to CSI resource sets. The CSI resource sets including resources to be used for channel measurement by the UE in the UIBR procedure. The UE receives a DCI indicating a TCI-state to be activated and used by the UE; performs channel measurement on one or more candidate cells using CSI resource sets associated with the activated TCI-state; and transmits a CSI-Report based on the channel measurement on the CSI resource set associated with the activated TCI-state.
[0010] In another aspect, embodiments are directed to a method performed by a UE for triggering a UIBR procedure that includes the UE performing channel measurement on one or more reference resources and determining that a Reference Signal Received Power (RSRP) of a reference resource that is Quasi-Co Located (QCL) with a current TCI-state is less than an RSRP of non-reference resources by an offset value. The UE transmits a CSI-Report based on the channel measurement on the non-reference resources, and the CSI-Report includes an indication of the non-reference resource.
[0011] In a final aspect, embodiments are directed to a method performed by a UE for triggering a UIBR procedure that includes the UE receiving RRC signaling that includes a configuration of a first threshold and a second threshold. The UE determines that an RSRP of a reference resource QCL with a current TCI-state is less than the first threshold ant that an RSRP of a non-reference resource configured by RRC signaling is greater than the second threshold. The UE transmits a CSI-Report based on the channel measurement on a non-reference resource, wherein the CSI-Report comprises an indication of the non-reference resource.
[0012] 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.
[0013] 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
[0014] 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.
[0015] Figure 1 illustrates an example wireless communication system, according to some aspects.
[0016] Figure 2 illustrates an example block diagram of a UE, according to some aspects.
[0017] Figure 3 illustrates a base station (BS) in communication with a UE device, according to some aspects.
[0018] Figures 4A and 4B illustrate MAC-CEs for resource set activation according to some aspects.
[0019] Figure 5 illustrates a MAC-CE for updating resources in a CSI resource set according to some aspects.
[0020] Figure 6 illustrates a scenario for updating resources in a CSI resource set according to some aspects.
[0021] Figures 7A and 7B illustrate an example of cell group based CSI resource updating 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] In order to enhance the mobility robustness performance for UEs that may be fast moving and / or require low-latency and high reliability, Release 19 multiple-input and multiple-output (MIMO) enhancement objectives may include UE-initiated beam reporting (UIBR) to help reduce the latency. Accordingly, the embodiments disclosed herein aim to facilitate UE-initiated and / or event-driven beam management for reducing overhead and / or latency. Embodiments incorporate the unified Transmission Configuration Indicator (TCI) , while leveraging as much as possible legacy CSI measurement and reporting configuration frameworks. Embodiments may have particular advantages in Frequency Range 2 (FR2) and in intra-cell and inter-cell beam management with a single Transmission and Reception Point (sTRP) .
[0024] In order to reduce delay in beam management (BM) for medium / high-speed UEs and streamline the BM procedure, embodiments are directed to quickly configuring the CSI resource set that will be used for measurements in a UIBR procedure in view of the UE mobility. Embodiments are further directed to triggering events for a UIBR procedure in view of the reporting latency, signaling overhead, and the resulting reliability.
[0025] The following is a glossary of terms that may be used in this disclosure:
[0026] 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.
[0027] 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.
[0028] 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. ”
[0029] 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.
[0030] 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.
[0031] 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.
[0032] 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.
[0033] 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.
[0034] 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.
[0035] 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.
[0036] 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.
[0037] 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.
[0038] 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.
[0039] 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.
[0040] 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.
[0041] 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.
[0042] 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.
[0043] Example Wireless Communication System
[0044] 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.
[0045] 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.
[0046] 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.
[0047] 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’ .
[0048] 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.
[0049] 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.
[0050] 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.
[0051] 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.
[0052] 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.
[0053] 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.
[0054] 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.
[0055] 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.
[0056] 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.
[0057] 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.
[0058] 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.
[0059] 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.
[0060] 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.
[0061] 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.
[0062] One such channel is the physical downlink shared channel (PDSCH) that 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 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.
[0063] 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) .
[0064] Example Communication Device
[0065] 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.
[0066] 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.
[0067] 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.
[0068] 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.
[0069] 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.
[0070] 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.
[0071] 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) .
[0072] 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.
[0073] 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.
[0074] 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.
[0075] 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.
[0076] 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.
[0077] 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.
[0078] 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.
[0079] 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.
[0080] 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.
[0081] 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.
[0082] Example Base Station
[0083] 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.
[0084] 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.
[0085] 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) .
[0086] 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.
[0087] 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.
[0088] 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. ) .
[0089] 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.
[0090] 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.
[0091] 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.
[0092] CSI Resource Set Determination for UE-Initiated Beam Reporting
[0093] As previously noted, in order to streamline BM procedures for medium / high-speed UEs, embodiments quickly configure the CSI resource set that will be used for measurements in a UIBR procedure in view of the UE mobility.
[0094] Embodiments disclosed herein include multiple approaches to determine the CSI resource to be used by the UE in a UIBR procedure. In one approach, RRC signaling may be used to provide a list of CSI resource sets for each serving cell. The CSI resource sets may include either Non-Zero-Power (NZP) CSI-RS resources or SSB resources that can be used for measurement reporting in the UIBR procedure.
[0095] In some embodiments, a new MAC-CE is introduced to fast activate one of “N” CSI resource sets to be used for UIBR operations. The configuration of the CSI resource sets may be indicated to the UE through RRC signaling. The MAC-CE is identified by a MAC Subheader with a dedicated LCID.
[0096] Figure 4A illustrates an example of a single cell MAC-CE for fast CSI resource set activation. The MAC-CE 400 may be used in a single cell for fast CSI resource set activation. The MAC-CE 400 has a fixed size and includes the serving cell ID 402. The serving cell ID 402 field indicates the identity of the Serving Cell for which the MAC-CE applies. The MAC-CE 400 also includes a CSI Resource Set ID 404. The CSI Resource Set ID 404 field indicates the identity of the CSI resource set that is activated by the MAC-CE.
[0097] Figure 4B illustrates an example of a multi-cell MAC-CE for fast CSI resource set activation. The MAC-CE 410 may be applied to multiple cells for fast CSI resource set activation. The MAC-CE 410 is used to update the CSI resource set associated different serving cells. The MAC-CE 410 has a variable size and includes fields “Ci” (e.g., C4 412) that indicate that the serving cell with cell ID “i” to which the MAC-CE is applied. The MAC-CE 410 also includes the CSI resource set ID (e.g., CSI Resource Set ID #3 414) for each serving cell. The value of the “Ci” field may be used to indicate an update to the CSI resource set for the serving cell.
[0098] For example, a value of “0” may indicate that the CSI resource set for this serving cell “i” is not updated. A value of “1” may indicate that the CSI resource set for the serving cell is updated, or a new CSI Resource set ID for the serving cell is included in the MAC-CE.
[0099] In some embodiments, RRC signaling is used to configure an initial CSI resource set to be used. Then, a new MAC-CE may be used to update the resources of the CSI resource set. For example, the RSs may be updated based on the most recent UL measurements performed by the network.
[0100] Figure 5 illustrates a MAC-CE for updating resources in a CSI resource set according to some aspects. The MAC-CE 500 includes the Serving cell ID 502, and a bitmap field “Pi” (e.g., subfield “P1” 512) that indicates an update to the RS with index “i” . The number of “Pi” fields may be hard coded in the specification or may be explicitly configured by RRC signaling for a given UE.
[0101] The MAC-CE 500 also includes RS ID #k fields (e.g., RS ID field #1 514) that indicate the RS ID to be used for the UIBR measurement for the RS with ordinal position “k” from the “Pi” fields. In other words, the indication at “P1” 512 is associated with RS ID field #1 514.
[0102] As in previous embodiments, the value of the “Pi” fields may be used to indicate the RS has been updated. For example, a value of “1” for a given “Pi” indicates the RS with index “i” is updated, and a value of “0” indicates that the RS with index “i” is maintained.
[0103] Figure 6 illustrates a scenario for updating resources in a CSI resource set according to some aspects. Figure 6 illustrates a path of a UE 606 in a serving cell 600. At time t0, the UE 606 is configured by RRC signaling with a first RS set {1, 2, 3, 4} 608A. At some later time t1, the UE 606 receives a MAC-CE that updates the first RS set {1, 2, 3, 4} 608A to the second RS set {3, 4, 5, 6} 608B.
[0104] For example, the UE 606 receives a MAC-CE as shown in Figure 5, with P0=1, P1=1, P2=0, and P3=0. In the MAC-CE, the RS ID field #0 is replaced with the RS ID field #5, and the RS ID field #1 is replaced with the RS ID field #6. Because P0=1 and P1=1, the UE 606 recognizes that RS ID field #0 and RS ID field #1 have been updated, and UE 606 uses the RS ID field #5 and RS ID #6 provided in the MAC-CE. Said another way, the field P1 512 is 1, so the UE recognizes that RS ID field 514 has been updated. Therefore, the UE updates the RS in the CSI set using the RS ID given in the RS ID field 514.
[0105] In some embodiments, the CSI resource set determination may be based on cell groups. In such embodiments, RRC signaling is used to divide the cells into sets of cell groups. For each candidate cell in the cell group, RRC signaling is used to configure a set of CSI resource sets to be used by the UE for a UIBR procedure. One of the candidate CSI resource sets may be configured as the initial CSI resource set by RRC signal.
[0106] In these embodiments, a new CRA field maybe introduced. The CRA field may be incorporated into DCI formats to select one CSI resource sets from the multiple CSI resource sets for all the candidate cells in a cell group by indicating the corresponding CSI resource set ID. The CRA field includes two sub-fields: a cell group indicator and a CSI Resource Set Indicator. RRC signaling may be used to associate the codepoints of the CSI Resource Set Indicator sub-field with different CSI resource sets. In other embodiments, the CRA field may be transmitted into a MAC-CE.
[0107] Figures 7A and 7B illustrate an example of cell group based CSI resource updating according to some aspects. Figure 7A demonstrates an example cell group that may be established through RRC signaling. The cell group includes Cell #1 with CSI resources {1, 2, 3, 4} 708A and Cell #2 with CSI resources {1, 5} 708B. As shown, the cell groups may be established based on the spatial correlation across the cells.
[0108] Figure 7B demonstrates updating a cell group based on the received CRA in accordance with embodiments. In Figure 7B, RRC signaling is used to divide the CSI resource sets for each candidate cell in a CG. More specifically, Cell #1 is divided into CSI resource set #1 708 A that includes the CSI resources {1, 2, 3, 4} and CSI resource set #2 709A that includes CSI resources {7,8, 9} . Cell #2 is divided into CSI resource set #1 708B that includes the CSI resources {1, 5} and CSI resource set #2 that includes CSI resources {16, 17} .
[0109] With this organization, a first cell group 720 and a second cell group 722 may be established. The organization of the resources in the cell groups are spatially correlated across the candidate cells. Accordingly, the CRA field may facilitate a fast cell group based CSI resource update.
[0110] For example, the CRA may include a codepoint “00” to activate the CSI resource sets identified as CSI resource set #1 for all the candidate cells in the first cell group 720. Codepoint “01” may be used to activate the CSI resource sets identified as CSI resource set #2 for all the candidate cells in the second cell group 722.
[0111] Embodiments also include a fast CSI resource set selection based on a TCI-state update event. In such embodiments, each TCI-state may be associated with a CSI resource set or associated with a cell group. This association may be established at the UE through RRC signaling. For example, the TCI field in the DCI format 1_1 or 1_2 (without or without a DL assignment) indicates the TCI-state. The associated CSI resource set is activated once the TCI-state is indicated. A one-to-one linking of the TCI-states on any of the candidate cells in a cell group may be established with the CSI resource sets for the candidate cells in the cell group.
[0112] For example, a TCI-state #k with a QCL-RS is linked to a CSI resource set #x associated with a RS set. The RS set may be established using adjacent DL beams. In this example, once the UE detects the TCI-state #k from the TCI field in DCI, the UE would assume the CSI resource set #x is activated for a UIBR procedure using the linked RS set.
[0113] Trigger Events for UE-Initiated Beam Reporting
[0114] Embodiments disclosed herein are further directed to triggering events for a UIBR procedure in view of the reporting latency, signaling overhead, and the resulting reliability. In these embodiments, the QCL source RS of the indicated TCI-state is termed as a “reference CSI resource” and other RSs in the activated CSI resource set are termed as a “non-reference CSI resource. ”
[0115] In some embodiments, when a measurement result (e.g., an L1-RSRP) associated with a non-reference CSI resource is better than the measurement result of the reference CSI resource by an offset amount, the UIBR procedure is triggered. The offset value may be provided by RRC signaling. For example, for the UIBR procedure, the offset value may be provided as part of the L1 measurement report configuration.
[0116] In some embodiments, two thresholds (e.g., T1 and T2) may be used. The two thresholds may be configured through RRC signaling. In these embodiments, the UIBR procedure is trigged if two conditions are met. The first condition is that the measured result of the reference CSI resource becomes less than the first threshold, and the second condition is that at least one measured result associated with a non-reference CSI resource in the activated CSI resource set becomes greater than the second threshold.
[0117] In the embodiments above, the UE may filter the measurements results obtained (e.g., an L1-RSRP) before comparing the measurement of results to the threshold. More specifically, the UE may filter the measurement result using the following formula: An= (1-α) *An-1+α*Mn
[0118] In this formula, Mn is the latest received measurement result; An is the updated filtered measurement result; and An-1 is the older filtered measurement result. A0 is set to M1, and the parameter α may be configured by RRC signaling.
[0119] The value of the parameter α allows for a weighted filtering based on a previous measurement. In this formula, α=1 may be used to disabling of the filtering operation, for example to help minimize latency in triggering.
[0120] Embodiments disclosed herein advantageous provide methods to quickly configure or update a CSI resource set for measurements in a UIBR procedure while considering the UE mobility. Embodiments also define conditions to trigger a UIBR procedure taking into account the reporting latency, result reliability and signaling overhead.
[0121] 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.
[0122] 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.
[0123] 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.
[0124] 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 Radio Resource Control (RRC) signaling comprising a configuration of a list of Channel State Indicator (CSI) resource sets, wherein each CSI resource set includes resources to be used by the UE for channel measurement in the UIBR procedure;receiving a Medium Access Control-Control Element (MAC-CE) indicating a CSI resource set from the list of CSI resource sets to be used by the UE for channel measurement,wherein the MAC-CE is identified by a dedicated Logical Channel Identification (LCID) in a MAC subheader;performing channel measurement using the CSI resource set indicated by the MAC-CE; andtransmitting a CSI report based on the channel measurement on the CSI resource set indicated by the MAC-CE.2.The method of claim 1, wherein the MAC-CE is a fixed size and comprises: a serving cell identification (ID) and a CSI resource set ID, where the CSI resource set is transmitted on the serving cell that is identified by the serving cell ID.3.The method of claim 1, wherein the MAC-CE is of variable size and the MAC-CE is used to update CSI resource set (s) for one or more serving cells, wherein each CSI resource set in the MAC-CE is associated with a serving cell.4.The method of claim 3, wherein the MAC-CE comprises:a bitmap field with ‘N’ bits, where each bit in the bitmap field is associated with a serving cell to indicate the CSI resource set for the associated serving cell is updated by the MAC-CE.5.The method of claim 4, wherein the MAC-CE comprises:a field to indicate a new CSI resource set identification (ID) for the serving cell that is indicated by the MAC-CE to update the CSI resource set.6.The method of claim 1, wherein the CSI resource set comprises Non-Zero-Power (NZP) CSI-Reference Signal (RS) resources or Synchronization Signal Block (SSB) resources to be used for measurement in the UIBR procedure.7.A method performed by a User Equipment (UE) for a UE-initiated beam reporting (UIBR) procedure, the method comprising:receiving Radio Resource Control (RRC) signaling comprising a configuration of a Channel State Indicator (CSI) resource set, wherein the CSI resource set includes Reference Signals (RSs) to be used for channel measurement in the UIBR procedure for a serving cell;receiving a Medium Access Control-Control Element (MAC-CE) , wherein the MAC-CE updates the RSs in the CSI resource set;performing channel measurement on at least one of the RSs in the CSI resource set that is updated by the MAC-CE; andtransmitting a CSI-Report based on the channel measurement on the RSs updated by the MAC-CE.8.The method of claim 7, wherein the MAC-CE comprises:an indication that a RS for the serving cell has been updated.9.The method of claim 7, wherein the RRC signaling further comprises the number of RSs in the CSI resource set.10.The method of claim 7, wherein the MAC-CE associates a RS with a RS identification (ID) based on an ordinal position of the RS among all the RS resources that are indicated to be updated.11.A method performed by a User Equipment (UE) for a UE-initiated beam reporting (UIBR) procedure, the method comprising:receiving Radio Resource Control (RRC) signaling indicating a configuration of a plurality of Channel State Indicator (CSI) resource sets for candidate cells in a cell group, wherein the CSI resource sets include resources to be used by the UE for channel measurement in the UIBR procedure;receiving a CSI Resource Activation (CRA) field indicating a CSI resource from the plurality of CSI resource sets to be activated and used for channel measurement,performing channel measurement using the CSI resources indicated by CRA field on one or more candidate cells;transmitting a CSI-Report based on the channel measurement on the CSI resources activated by the CRA field.12.The method of claim 11, wherein the CRA field is received in Downlink Control Information (DCI) .13.The method of claim 11, wherein the CRA field is received in a Medium Access Control-Control Element (MAC-CE) .14.The method of claim 11, wherein an initial CSI resource set is provided by the RRC signaling.15.The method of claim 11, wherein the CRA field comprises:a subfield indicating the cell group; anda subfield indicating a corresponding CSI resource set for cell group.16.The method of claim 15, wherein an initial CSI resource set is provided by the RRC signaling.17.A method performed by a User Equipment (UE) for a UE-initiated beam reporting (UIBR) procedure, the method comprising:receiving Radio Resource Control (RRC) signaling comprising a configuration of linking Transmission Configuration Indicator (TCI) -states on a plurality of candidate cells in a cell group to Channel State Indicator (CSI) resource sets, wherein the CSI resource sets comprise resources to be used for channel measurement by the UE in the UIBR procedure;receiving a Downlink Control Information (DCI) indicating a TCI-state to be activated and used by the UE;performing channel measurement on one or more candidate cells using CSI resource sets associated with the activated TCI-state; andtransmitting a CSI-Report based on the channel measurement on the CSI resource set associated with the activated TCI-state.18.A method performed by a User Equipment (UE) for triggering a UE-initiated beam reporting (UIBR) procedure, the method comprising:performing channel measurement on one or more reference resources; anddetermining that a Reference Signal Received Power (RSRP) of a reference resource that is Quasi-Co Located (QCL) with a current Transmission Configuration Indicator (TCI) -state is less than an RSRP of non-reference resources by an offset value,transmitting a CSI-Report based on the channel measurement on the non-reference resources, wherein the CSI-Report comprises an indication of the non-reference resource.19.The method of claim 18, wherein the RRC signaling comprises the offset value.20.The method according to claim 18, the method further comprises:filtering results of the channel measurement based on a previously filtered measurement result and a recent measurement result,wherein the CSI-Report comprises a portion of the filtered results of the channel measurement.21.The method of claim 20, wherein the RRC signaling comprises a weight of the contribution of the previously filtered measurement result for the filtering.22.A method performed by a User Equipment (UE) for triggering a UE-initiated beam reporting (UIBR) procedure, the method comprising:receiving Radio Resource Control (RRC) signaling comprising a configuration of a first threshold and a second threshold;determining that a Reference Signal Received Power (RSRP) of a reference resource Quasi-Co Located (QCL) with a current Transmission Configuration Indicator (TCI) -state is less than the first threshold;determining that an RSRP of a non-reference resource configured by RRC signaling is greater than the second threshold,transmitting a CSI-Report based on the channel measurement on a non-reference resource, wherein the CSI-Report comprises an indication of the non-reference resource.23.The method according to claim 22, the method further comprises:filtering results of the channel measurement based on a previously measured RSRP and a recent measurement RSRP,wherein the CSI-Report comprises a portion of the filtered results of the channel measurement.24.The method of claim 23, wherein the RRC signaling comprises a weight of the contribution of the previously measured RSRP.25.A wireless device configured to perform the methods of any of claims 1–24.26.A non-transitory computer readable medium configured to store and execute instructions to perform the methods of any of claims 1–24.27.A baseband processor configured to execute instructions to cause a wireless device to perform the methods of any of claims 1–24.
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