Beam reconfiguration rules in case of beam update based on group component carriers

Abstract

Various aspects relate to a mechanism for a wireless communication device to reset a beam. A UE identifies a list of multiple component carriers (CCs) (1102). The UE detects a beam failure on a first CC of the multiple CCs (1104). The UE transmits a beam failure recovery request to a base station, the beam failure recovery request including a candidate beam indication for a candidate beam (1106). The base station receives the beam failure recovery request and transmits a beam failure recovery response to the UE. The UE receives the beam failure recovery response (1108) and applies the candidate beam to at least one CC of the multiple CCs (1110). The UE may apply the candidate beam to each CC or only to the first CC. The UE may apply the candidate beam to the at least one CC of the multiple CCs after a predetermined number of symbols after receiving the beam failure recovery response.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Non-Provisional Patent Application No. 17 / 096,907 filed in the United States Patent and Trademark Office on November 12, 2020, and Provisional Patent Application No. 62 / 936,388 filed in the United States Patent and Trademark Office on November 15, 2019, the entire contents of which are incorporated herein by reference as if fully set forth below and for all applicable purposes. Technical Field

[0003] The techniques discussed below relate generally to wireless communication systems, and more particularly to beam reconfiguration in beam-based communication scenarios (e.g., millimeter wave beams). Background Art

[0004] In 5G NR, physical channels and reference signals may be transmitted using antenna ports. If the properties of the channel over which symbols on one antenna port are communicated can be inferred from the channel over which symbols on another antenna port are communicated, the two antenna ports may be referred to as quasi-co-located (QCL). Therefore, if the two antenna ports are QCL, a receiving device that detects the channel properties of a signal from one antenna port may apply those channel properties to detecting a signal from another QCL antenna port. In wireless communication systems such as those specified under the standards for 5G NR, both base stations and wireless communication devices may identify beams for beamforming of each channel or signal based on the QCL relationship associated with the channel or signal.

[0005] The transmission configuration indication (TCI) state may be used to configure the QCL relationship between the reference signal and the antenna port of each channel or signal. The TCI state may be activated or deactivated for a specific component carrier (CC) or a specific bandwidth part (BWP). Summary of the invention

[0006] An overview of one or more aspects of the present disclosure is given below to provide a basic understanding of these aspects. This overview is not an exhaustive overview of all conceived features of the present disclosure, and is neither intended to identify the key or decisive elements of all aspects of the present disclosure nor to attempt to define the scope of any or all aspects of the present disclosure. Its sole purpose is to present some concepts of one or more aspects of the present disclosure in a form as a preface to a more detailed description given later.

[0007] A method of wireless communication operable at a user equipment (UE) is provided. The method includes identifying a list of multiple component carriers (CCs). The method also includes detecting a beam failure on a first component carrier of the multiple component carriers. The method further includes transmitting a beam failure recovery request to a base station, the beam failure recovery request including a candidate beam indication for a candidate beam. In addition, the method includes receiving a beam failure recovery response from the base station. The method also includes applying the candidate beam to at least one component carrier of the multiple component carriers.

[0008] A method of wireless communication operable at a base station is provided. The method includes receiving a beam failure recovery request from a UE, the beam failure recovery request including a candidate beam indication, the candidate beam indication indicating a candidate beam based on detection of a beam failure of a first component carrier among a plurality of component carriers. The method also includes transmitting a beam failure recovery response including an application indication to the UE, the application indication indicating that the UE is to apply the candidate beam to at least one component carrier among the plurality of component carriers.

[0009] A user equipment (UE) in a wireless communication system is provided. The UE includes a wireless transceiver. The UE also includes a memory. The UE further includes a processor communicatively coupled to the wireless transceiver and the memory. The processor and the memory are configured to identify a list of multiple component carriers (CCs). The processor and the memory are also configured to detect a beam failure on a first component carrier among the multiple component carriers. The processor and the memory are further configured to transmit a beam failure recovery request to a base station, the beam failure recovery request including a candidate beam indication for a candidate beam. In addition, the processor and the memory are configured to receive a beam failure recovery response from the base station. The processor and the memory are also configured to apply the candidate beam to at least one component carrier among the multiple component carriers.

[0010] A base station in a wireless communication system is provided. The base station includes a wireless transceiver. The base station also includes a memory. The base station further includes a processor communicatively coupled to the wireless transceiver and the memory. The processor and the memory are configured to: receive a beam failure recovery request from the UE. The beam failure recovery request includes a candidate beam indication, which indicates a candidate beam based on the detection of a beam failure of a first component carrier among multiple component carriers. The processor and the memory are also configured to transmit a beam failure recovery response including an application indication to the UE, the application indication indicating that the UE is to apply the candidate beam to at least one component carrier among the multiple component carriers.

[0011] A non-transitory processor-readable storage medium of a user equipment (UE) having instructions stored thereon is provided. The instructions, when executed by a processing circuit, cause the processing circuit to identify a list of multiple component carriers (CCs). The instructions, when executed by the processing circuit, also cause the processing circuit to detect a beam failure on a first component carrier among the multiple component carriers. The instructions, when executed by the processing circuit, further cause the processing circuit to transmit a beam failure recovery request to a base station, the beam failure recovery request including a candidate beam indication for a candidate beam. In addition, the instructions, when executed by the processing circuit, cause the processing circuit to receive a beam failure recovery response from the base station. The instructions, when executed by the processing circuit, also cause the processing circuit to apply the candidate beam to at least one component carrier among the multiple component carriers.

[0012] A non-transitory processor-readable storage medium of a base station having instructions stored thereon is provided. The instructions, when executed by a processing circuit, cause the processing circuit to receive a beam failure recovery request from the UE. The beam failure recovery request includes a candidate beam indication, the candidate beam indication indicating a candidate beam based on detection of a beam failure of a first component carrier among a plurality of component carriers. The instructions, when executed by the processing circuit, also cause the processing circuit to transmit a beam failure recovery response including an application indication to the UE, the application indication indicating that the UE is to apply the candidate beam to at least one component carrier among the plurality of component carriers.

[0013] A user equipment (UE) is provided. The UE includes means for identifying a list of multiple component carriers (CCs). The UE also includes means for detecting a beam failure on a first component carrier of the multiple component carriers. The UE further includes means for transmitting a beam failure recovery request to a base station, the beam failure recovery request including a candidate beam indication for a candidate beam. In addition, the UE includes means for receiving a beam failure recovery response from the base station. The UE also includes means for applying the candidate beam to at least one component carrier of the multiple component carriers.

[0014] A base station is provided. The base station includes means for receiving a beam failure recovery request from the UE. The beam failure recovery request includes a candidate beam indication, the candidate beam indication indicating a candidate beam based on detection of a beam failure of a first component carrier among a plurality of component carriers. The base station also includes means for transmitting a beam failure recovery response including an application indication to the UE, the application indication indicating that the UE is to apply the candidate beam to at least one component carrier among the plurality of component carriers.

[0015] These and other aspects of the present invention will be more fully understood after reading the following detailed description. After reading the following description of specific exemplary embodiments in conjunction with the accompanying drawings, other aspects, features and embodiments will be apparent to those of ordinary skill in the art. Although the various features may be discussed below with respect to certain embodiments and drawings, all embodiments may include one or more of the advantageous features discussed herein. In other words, although one or more embodiments may be discussed as having certain advantageous features, one or more such features may also be used according to the various embodiments discussed herein. In a similar manner, although the exemplary embodiments may be discussed below as device, system or method embodiments, it should be appreciated that such exemplary embodiments may be implemented in various devices, systems, and methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic illustration of a wireless communication system in accordance with some aspects.

[0017] Figure 2 is a conceptual illustration of an example of a radio access network in accordance with some aspects.

[0018] Figure 3 is a block diagram illustrating a wireless communication system supporting multiple-input multiple-output (MIMO) communications.

[0019] Figure 4 is a diagram illustrating an example of communication between a base station and a UE using beamforming in accordance with some aspects.

[0020] Figure 5 is a schematic illustration of the organization of wireless resources in an air interface utilizing orthogonal frequency division multiplexing (OFDM) according to some embodiments.

[0021] Figure 6 is a schematic illustration of an OFDM air interface utilizing scalable parameter sets in accordance with some aspects of the present disclosure.

[0022] Figure 7 is a diagram illustrating a multi-cell transmission environment according to some aspects.

[0023] Figure 8 is a conceptual signaling diagram illustrating an example environment for beam resetting in accordance with some aspects.

[0024] Fig. 9 is a conceptual signaling diagram illustrating an example environment for beam resetting in accordance with some aspects.

[0025] Fig.10 is a block diagram conceptually illustrating an example of a hardware implementation for a user equipment (UE) according to some aspects of the present disclosure.

[0026] Fig.11 is a flow chart of a method for beam resetting according to some aspects.

[0027] Fig.12 is a flow chart of a method for beam resetting according to some aspects.

[0028] Fig.13 is a block diagram conceptually illustrating an example of a hardware implementation for a base station according to some aspects of the present disclosure.

[0029] Fig.14 is a flow chart of a method for beam resetting according to some aspects.

[0030] Fig.15 is a flow chart of a method for beam resetting according to some aspects. DETAILED DESCRIPTION

[0031] The detailed description set forth below in conjunction with the accompanying drawings is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. This detailed description includes specific details to provide a thorough understanding of the various concepts. However, it will be apparent to those skilled in the art that these concepts may be practiced without these specific details. In some instances, well-known structures and components are shown in block diagram form in order to avoid diluting such concepts.

[0032] The electromagnetic spectrum is typically subdivided into various classes, bands, channels, etc. based on frequency / wavelength. In 5G NR, two initial operating bands have been identified as frequency range designations FR1 (410 MHz–7.125 GHz) and FR2 (24.25 GHz–52.6 GHz). It should be understood that although a portion of FR1 is greater than 6 GHz, FR1 is often (interchangeably) referred to as the “sub-6 GHz” band in various documents and articles. Similar naming issues sometimes arise with respect to FR2, which is often (interchangeably) referred to as the “millimeter wave” band in various documents and articles, although it is different from the extremely high frequency (EHF) band (30 GHz–300 GHz) identified as the “millimeter wave” band by the International Telecommunication Union (ITU).

[0033] Frequencies between FR1 and FR2 are generally referred to as mid-band frequencies. Recent 5G NR research has identified the operating bands of these mid-band frequencies as frequency range designation FR3 (7.125GHz-24.25GHz). The frequency bands falling within FR3 can inherit FR1 characteristics and / or FR2 characteristics, and therefore can effectively extend the characteristics of FR1 and / or FR2 to mid-band frequencies. In addition, higher frequency bands are currently being explored to extend 5G NR operations to above 52.6GHz. For example, three higher operating bands have been identified as frequency range designations FR4-a or FR4-1 (52.6GHz–71GHz), FR4 (52.6GHz–114.25GHz), and FR5 (114.25GHz–300GHz). Each of these higher frequency bands falls within the EHF band.

[0034] In view of the above aspects, unless otherwise specifically stated, it should be understood that if used in this document, the term "sub-6 GHz" and the like can broadly refer to frequencies that can be less than 6 GHz, can be within FR1, or can include mid-band frequencies. In addition, unless otherwise specifically stated, it should be understood that if used in this document, the term "millimeter wave" and the like can broadly refer to frequencies that can include mid-band frequencies, can be within FR2, FR4, FR4-a or FR4-1 and / or FR5, or can be within the EHF band.

[0035] A base station (e.g., a gB node (gNB)) may provide a set of transmission configuration indication (TCI) state configurations to a UE in a downlink control information (DCI) message. Each TCI state configuration contains parameters for configuring the QCL relationship between one or two downlink reference signals and a demodulation reference signal (DM-RS) port of a physical downlink shared channel (PDSCH), a DM-RS port of a physical downlink control channel (PDCCH), or (s) CSI-RS port of a channel state information reference signal (CSI-RS) resource. In addition, the TCI state may include a beam indication. In this way, the base station may inform the UE that a certain PDSCH and / or PDCCH transmission uses the same transmit beam as the configured reference signal. In simple terms, it can be said that the TCI state may include a beam indication that explicitly identifies which downlink beam the base station is using.

[0036] Once these TCI state configurations are provided to the UE, the base station may activate or deactivate the provided TCI states for a given UE by transmitting a specific medium access control (MAC) control element (MAC-CE), which may be referred to as "TCI States Activation / Deactivation for UE-specific PDSCH MAC-CE" in 3GPP TS 38.321 Section 6.1.3.14, Release 15 and Release 16. The MAC-CE is identified by a MAC subheader that includes a serving cell ID, a bandwidth part (BWP) ID, and a parameter T i , the parameter T i Indicates the activation or deactivation state of the TCI state with TCI state Id i. Here, i is an integer index value that indexes the TCI state list previously provided to the UE.

[0037] One aspect of the MAC-CE is that the MAC-CE activates the TCI state only for the identified component carrier (CC) or bandwidth part (BWP). That is, because the MAC-CE may include a single BWP ID, a separate such MAC-CE may be required for each CC or BWP.

[0038] In 5G NR, carrier aggregation (CA) is supported. CA refers to the cascading of multiple component carriers (CCs) to provide increased bandwidth. Such 5G networks can provide aggregation of sub-6GHz carriers, above-6GHz carriers, millimeter wave carriers, etc., all controlled by a single integrated MAC layer. Aggregated CCs may be adjacent or non-adjacent to each other, and they may be inter-band or intra-band. In addition, aggregated CCs may use different parameter sets, for example, with different subcarrier spacing (SCS), time slot lengths, etc. In some examples, one of these CCs may be referred to as a primary cell (PCell), and one or more other CCs may be referred to as secondary cells (SCells).

[0039] When implementing CA, the base station may provide a component carrier (CC) list set to the UE using radio resource control (RRC) signaling. The base station may further provide a separate MAC-CE to activate a certain TCI state in all BWPs or CCs. In various aspects, instead of transmitting a separate MAC-CE for each BWP or CC, a group CC-based beam update procedure may be used to activate one or more TCI states in all BWPs or CCs. In the group CC-based beam update procedure, when the TCI state ID set for a given PDSCH is activated by a MAC-CE for a CC / BWP set (at least for the same frequency band), and when the applicable CC list is indicated by RRC signaling, the same TCI state ID set may be applied to all BWPs in the CC. In some aspects, the same TCI state ID set may be applied to all CCs in the CC list including the CC. Therefore, if a CC is included in a CC list indicated by RRC signaling from the base station to the UE, the TCI state set may be applied to all CCs in the CC list, as well as all BWPs in all those CCs. In this way, the base station may not be required to provide a separate MAC-CE to activate a certain TCI state in all BWPs or CCs.

[0040] Although various aspects and embodiments are described in this application by explanation of some examples, it will be understood by those skilled in the art that additional implementations and use cases can be generated in many different arrangements and scenarios. The innovation described herein can be implemented across many different platform types, devices, systems, shapes, sizes, and packaging arrangements. For example, each embodiment and / or use can be generated via an integrated chip embodiment and other devices based on non-module components (e.g., end-user devices, vehicles, communication equipment, computing equipment, industrial equipment, retail / shopping equipment, medical equipment, AI-enabled devices, etc.). Although some examples may or may not be specifically for each use case or application, the wide applicability of the described innovation may occur. The scope of each implementation can range from chip-level or module components to non-module, non-chip-level implementations, and further to aggregated, distributed or OEM devices or systems incorporating one or more aspects of the described innovation. In some practical environments, the equipment incorporating the various aspects and features described may also necessarily include additional components and features for implementing and practicing the claimed and described embodiments. For example, the transmission and reception of wireless signals necessarily include several components for analog and digital purposes (e.g., hardware components, including antennas, RF chains, power amplifiers, modulators, buffers, processors, interleavers, adders / summers, etc.). The innovations described herein are intended to be practiced in a wide variety of devices, chip-level components, systems, distributed arrangements, end-user devices, etc., of various sizes, shapes, and configurations.

[0041] The various concepts presented throughout this disclosure may be implemented across a wide variety of telecommunication systems, network architectures, and communication standards. Figure 1 , various aspects of the present disclosure are explained with reference to a wireless communication system 100 as an illustrative example and not as a limitation. The wireless communication system 100 includes three interacting domains: a core network 102, a radio access network (RAN) 104, and a user equipment (UE) 106. By means of the wireless communication system 100, the UE 106 may be enabled to perform data communications with an external data network 110, such as, but not limited to, the Internet.

[0042] The RAN 104 may implement any suitable one or more wireless communication technologies to provide radio access to the UE 106. As an example, the RAN 104 may operate in accordance with the 3rd Generation Partnership Project (3GPP) New Radio (NR) specifications, commonly referred to as 5G. As another example, the RAN 104 may operate under a mix of 5G NR and Evolved Universal Terrestrial Radio Access Network (eUTRAN) standards, commonly referred to as Long Term Evolution (LTE). 3GPP refers to this hybrid RAN as the Next Generation RAN, or NG-RAN. Of course, many other examples may be utilized within the scope of the present disclosure.

[0043] As illustrated, RAN 104 includes multiple base stations 108 (e.g., RAN entities, RAN nodes, etc.). Broadly speaking, a base station is a network element in a radio access network that is responsible for radio transmission and reception to or from a UE in one or more cellular cells. In different technologies, standards, or contexts, a base station may be referred to as a base transceiver station (BTS), a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), an access point (AP), a B node (NB), an e B node (eNB), a g B node (gNB), a transmission reception point (TRP), or some other suitable terminology by those skilled in the art. In some examples, a base station may include two or more TRPs that may be co-located or non-co-located. Each TRP may communicate on the same or different carrier frequencies in the same or different frequency bands.

[0044] The radio access network 104 is further illustrated as supporting wireless communications for multiple mobile devices. A mobile device may be referred to as a user equipment (UE) in the 3GPP standard, but may also be referred to as a mobile station (MS), a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal (AT), a mobile terminal, a wireless terminal, a remote terminal, a handset, a terminal, a user agent, a mobile client, a client, or some other suitable terminology by those skilled in the art. A UE may be a device that provides a user with access to network services.

[0045] Within this document, a "mobile" device does not necessarily need to have mobile capabilities, and may be stationary. The term mobile device or mobile equipment refers broadly to a wide variety of devices and technologies. A UE may include several hardware structural components sized, shaped, and arranged to facilitate communication; such components may include antennas, antenna arrays, RF chains, amplifiers, one or more processors, and the like electrically coupled to each other. For example, some non-limiting examples of mobile devices include mobile devices, cellular (cell) phones, smart phones, Session Initiation Protocol (SIP) phones, laptops, personal computers (PCs), notebooks, netbooks, smartbooks, tablet devices, personal digital assistants (PDAs), and a wide variety of embedded systems, for example, corresponding to the "Internet of Things" (IoT). Additionally, the mobile device may be a car or other transportation vehicle, a remote sensor or actuator, a robot or robotic device, a satellite radio, a global positioning system (GPS) device, an object tracking device, a drone, a multicopter, a quadcopter, a remote control device, a consumer and / or wearable device (such as glasses), a wearable camera, a virtual reality device, a smart watch, a health or fitness tracker, a digital audio player (e.g., an MP3 player), a camera, a game console, etc. The mobile device may also be a digital home or smart home device, such as home audio, video and / or multimedia equipment, an appliance, a vending machine, a smart lighting device, a home security system, a smart meter, etc. The mobile device may also be a smart energy device, a security device, a solar panel or solar array, a municipal infrastructure device that controls power, lighting, water (e.g., a smart grid), an industrial automation and enterprise device, a logistics controller, an agricultural equipment, etc. Still further, the mobile device may provide connected medical or telemedicine support, such as health care at a distance. Telehealth devices may include telehealth monitoring devices and telehealth supervisory devices, whose communications may be given priority or prioritized access over other types of information, for example, in the form of prioritized access for critical service data transmission and / or associated QoS for critical service data transmission.

[0046] Wireless communication between RAN 104 and UE 106 may be described as utilizing an air interface. Transmissions over the air interface from a base station (e.g., base station 108) to one or more UEs (e.g., UE 106) may be referred to as downlink (DL) transmissions. According to certain aspects of the present disclosure, the term downlink may refer to a point-to-multipoint transmission originating at a scheduling entity (further described below; e.g., base station 108). Another way to describe this scheme may be to use the term broadcast channel multiplexing. Transmissions from a UE (e.g., UE 106) to a base station (e.g., base station 108) may be referred to as uplink (UL) transmissions. According to further aspects of the present disclosure, the term uplink may refer to a point-to-point transmission originating at a scheduled entity (further described below; e.g., UE 106).

[0047] In some examples, access to the air interface may be scheduled, wherein a scheduling entity (e.g., a base station 108) allocates resources for communication among some or all devices and equipment within its service area or cell. Within the present disclosure, as discussed further below, a scheduling entity may be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more scheduled entities. That is, for scheduled communications, a UE 106 (which may be a scheduled entity) may utilize resources allocated by the scheduling entity 108.

[0048] like Figure 1 , the scheduling entity 108 may broadcast downlink traffic 112 to one or more scheduled entities 106. Broadly speaking, the scheduling entity 108 is a node or device responsible for scheduling traffic in the wireless communication network, including downlink traffic 112 and, in some examples, uplink traffic 116 from one or more scheduled entities 106 to the scheduling entity 108. On the other hand, the scheduled entity 106 is a node or device that receives downlink control information 114 (including but not limited to scheduling information (e.g., grants), synchronization or timing information), or other control information from another entity in the wireless communication network, such as the scheduling entity 108.

[0049] In addition, uplink and / or downlink control information and / or traffic information may be divided into frames, subframes, time slots, and / or symbols in time. As used herein, a symbol may refer to a time unit in which each subcarrier carries one resource element (RE) in an orthogonal frequency division multiplexing (OFDM) waveform. A time slot may carry 7 or 14 OFDM symbols. A subframe may refer to a duration of 1 ms. Multiple subframes or time slots may be grouped together to form a single frame or radio frame. Of course, these definitions are not required, and any appropriate scheme may be utilized to organize the waveform, and the various time divisions of the waveform may have any appropriate duration.

[0050] In general, the base stations 108 may include a backhaul interface for communicating with a backhaul portion 120 of the wireless communication system. The backhaul 120 may provide a link between the base stations 108 and the core network 102. Furthermore, in some examples, the backhaul network may provide interconnections between the respective base stations 108. Various types of backhaul interfaces may be employed, such as a direct physical connection using any suitable transport network, a virtual network, and the like.

[0051] The core network 102 may be part of the wireless communication system 100 and may be independent of the radio access technology used in the RAN 104. In some examples, the core network 102 may be configured according to a 5G standard (e.g., 5GC). In other examples, the core network 102 may be configured according to a 4G Evolved Packet Core (EPC), or any other suitable standard or configuration.

[0052] Now refer to Figure 2 , a schematic illustration of RAN 200 is provided by way of example and not limitation. In some examples, RAN 200 may be similar to that described above and in Figure 1 The geographic area covered by the RAN 200 may be divided into cellular regions (cells) that may be uniquely identified by a user equipment (UE) based on an identity broadcast from an access point or base station. Figure 2 Macro cells 202, 204, and 206 and small cells 208 are illustrated, each of which may include one or more sectors (not shown). A sector is a sub-area of ​​a cell. All sectors within one cell are served by the same base station. A radio link within a sector may be identified by a single logical identification belonging to the sector. In a cell divided into sectors, multiple sectors within a cell may be formed by antenna groups, where each antenna is responsible for communication with UEs in a portion of the cell.

[0053] Various base station arrangements can be used. Figure 2, two base stations 210 and 212 are shown in the cellular cells 202 and 204; and a third base station 214 is shown as controlling a remote radio head (RRH) 216 in the cellular cell 206. That is, the base station may have an integrated antenna, or may be connected to the antenna or RRH by a feeder cable. In the illustrated example, the cellular cells 202, 204, and 206 may be referred to as macro cells because the base stations 210, 212, and 214 support cellular cells with large sizes. In addition, the base station 218 is shown in a small cell 208 (e.g., a micro cell, a micro cell, a femto cell, a home base station, a home node B, a home evolved node B, etc.), which may overlap with one or more macro cells. In this example, the cellular cell 208 may be referred to as a small cell because the base station 218 supports a cellular cell with a relatively small size. The cellular cell size setting may be completed according to the system design and component constraints.

[0054] It is to be understood that the radio access network 200 may include any number of wireless base stations and cellular cells. In addition, relay nodes may be deployed to extend the size or coverage area of ​​a given cellular cell. Base stations 210, 212, 214, 218 provide wireless access points to the core network for any number of mobile devices. In some examples, base stations 210, 212, 214, and / or 218 may be similar to those described above and in Figure 1 The same as the base station / scheduling entity 108 illustrated in FIG.

[0055] Within the RAN 200, cells may include UEs that may be in communication with one or more sectors of each cell. Further, each base station 210, 212, 214, and 218 may be configured to provide a core network (e.g., such as a core network) for all UEs in the corresponding cell. Figure 1 2). For example, UEs 222 and 224 may be in communication with base station 210; UEs 226 and 228 may be in communication with base station 412; UEs 230 and 232 may be in communication with base station 214 via RRH 216; and UE 234 may be in communication with base station 218. In some examples, UEs 222, 224, 226, 228, 230, 232, 234, 238, 240, and / or 242 may be in communication with base stations described above and in Figure 1 The UE / scheduled entity 106 is the same as illustrated in FIG.

[0056] In some examples, unmanned aerial vehicle (UAV) 220 (which may be a drone or a quadcopter) may be a mobile network node and may be configured to function as a UE. For example, UAV 220 may operate within cell 202 by communicating with base station 210.

[0057] Base stations 210, 212, 214, 218 may operate as scheduling entities, thereby scheduling resources for communications between UEs in their service areas or cellular cells 202, 204, 206, 208, respectively. However, base stations are not the only entities that can be used as scheduling entities. That is, in some examples, a UE may be used as a scheduling entity, thereby scheduling resources for one or more scheduled entities (e.g., one or more other UEs). For example, two or more UEs (e.g., UEs 238, 240, and 242) may communicate with each other using peer-to-peer (P2P) or sidelink signals 237 without relaying the communication through a base station. In some examples, UEs 238, 240, and 242 may each act as a scheduling entity or a transmitting sidelink device and / or a scheduled entity or a receiving sidelink device to schedule resources and communicate sidelink signals 237 therebetween without relying on scheduling or control information from a base station. In other examples, two or more UEs (e.g., UEs 226 and 228) within the coverage area of ​​a base station (e.g., base station 212) may also communicate sidelink signals 227 on a direct link (sidelink) without communicating the communication through base station 246. In this example, base station 212 may allocate resources to UEs 226 and 228 for sidelink communications. In either case, such sidelink signaling 227 and 237 may be implemented in a P2P network, a device-to-device (D2D) network, a vehicle-to-vehicle (V2V) network, a vehicle-to-everything (V2X), a mesh network, or other suitable direct link network.

[0058] In the RAN 200, the ability of a UE to communicate independently of its location while moving is called mobility. Each physical channel between the UE and the radio access network is generally established, maintained, and released under the control of the AMF.

[0059] The RAN 200 may utilize DL-based mobility or UL-based mobility to implement mobility and handover (e.g., the transfer of a UE's connection from one radio channel to another). In a network configured for DL-based mobility, during a call with a scheduling entity, or at any other time, a UE may monitor various parameters of a signal from its serving cell and various parameters of neighboring cells. Depending on the quality of these parameters, the UE may maintain communication with one or more neighboring cells. During this time, if the UE moves from one cell to another, or if the signal quality from a neighboring cell exceeds the signal quality from the serving cell for a given amount of time, the UE may perform a handover or handover from the serving cell to a neighboring (target) cell. For example, a UE 224 (illustrated as a vehicle, but any suitable form of UE may be used) may move from a geographic area corresponding to its serving cell 202 to a geographic area corresponding to a neighboring cell 206. When the signal strength or quality from a neighbor cell 206 exceeds the signal strength or quality of its serving cell 202 for a given amount of time, the UE 224 may transmit a report message indicating this condition to its serving base station 210. In response, the UE 224 may receive a handover command, and the UE may undergo a handover to the cell 206.

[0060] In a network configured for UL-based mobility, the UL reference signal from each UE may be used by the network to select a serving cell for each UE. In some examples, base stations 210, 212, and 214 / 216 may broadcast unified synchronization signals (e.g., unified primary synchronization signal (PSS), unified secondary synchronization signal (SSS), and unified physical broadcast channel (PBCH)). UEs 222, 224, 226, 228, 230, and 232 may receive the unified synchronization signals, derive carrier frequency and slot timing from these synchronization signals, and transmit uplink pilots or reference signals in response to the derived timing. The uplink pilot signal transmitted by a UE (e.g., UE 224) may be received concurrently by two or more cells (e.g., base stations 210 and 214 / 216) within the radio access network 200. Each of these cells may measure the strength of the pilot signal, and the radio access network (e.g., one or more of base stations 210 and 214 / 216 and / or a central node within a core network) may determine a serving cell for UE 224. As UE 224 moves in radio access network 200, the network may continue to monitor uplink pilot signals transmitted by UE 224. When the signal strength or quality of the pilot signal measured by a neighboring cell exceeds the signal strength or quality measured by the serving cell, network 200 may handover UE 224 from the serving cell to the neighboring cell with or without notifying UE 224.

[0061] Although the synchronization signal transmitted by base stations 210, 212 and 214 / 216 may be uniform, the synchronization signal may not identify a specific cell, but may identify a zone including multiple cells operating on the same frequency and / or having the same timing. The use of zones in a 5G network or other next generation communication network implements an uplink-based mobility framework and improves the efficiency of both the UE and the network because the number of mobility messages that need to be exchanged between the UE and the network can be reduced.

[0062] In various implementations, the air interface in the radio access network 200 may utilize a licensed spectrum, an unlicensed spectrum, or a shared spectrum. A licensed spectrum generally provides exclusive use of a portion of the spectrum by a mobile network operator purchasing a license from a government regulator. An unlicensed spectrum provides shared use of a portion of the spectrum without a government-granted license. Although some technical rules generally still need to be followed to access the unlicensed spectrum, any operator or device can obtain access. A shared spectrum may fall between licensed and unlicensed spectrum, where technical rules or restrictions may be required to access the spectrum, but the spectrum may still be shared by multiple operators and / or multiple RATs. For example, a license holder of a portion of a licensed spectrum may provide licensed shared access (LSA) to share the spectrum with other parties, for example, using conditions determined by the appropriate license holder to obtain access.

[0063] The air interface in the radio access network 200 may utilize one or more multiplexing and multiple access algorithms to enable simultaneous communication of various devices. For example, the 5G NR specification utilizes orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) to provide multiple access for UL transmissions from UE 222 and 224 to base station 210, and multiplexing for DL ​​transmissions from base station 210 to one or more UEs 222 and 224. In addition, for UL transmissions, the 5G NR specification provides support for discrete Fourier transform spread OFDM (DFT-s-OFDM) with CP (also known as single carrier FDMA (SC-FDMA)). However, within the scope of the present disclosure, multiplexing and multiple access are not limited to the above schemes, and may be provided using time division multiple access (TDMA), code division multiple access (CDMA), frequency division multiple access (FDMA), sparse code multiple access (SCMA), resource extension multiple access (RSMA), or other appropriate multiple access schemes. In addition, multiplexing of DL transmissions from base station 210 to UEs 222 and 224 may be provided using time division multiplexing (TDM), code division multiplexing (CDM), frequency division multiplexing (FDM), orthogonal frequency division multiplexing (OFDM), sparse code multiplexing (SCM), or other suitable multiplexing schemes.

[0064] The air interface in the radio access network 200 may further utilize one or more duplex algorithms. Duplex refers to a point-to-point communication link in which both endpoints can communicate with each other in two directions. Full-duplex means that both endpoints can communicate with each other at the same time. Half-duplex means that only one endpoint can send information to the other endpoint at a time. Time division duplex (TDD) is usually used to implement half-duplex simulation for wireless links. In TDD, transmissions in different directions on a given channel are separated from each other using time division multiplexing. That is, at some times, the channel is dedicated to transmission in one direction, and at other times, the channel is dedicated to transmission in another direction, where the direction can change very quickly, for example, several times per time slot. In wireless links, full-duplex channels generally rely on physical isolation of transmitters and receivers, and suitable interference cancellation techniques. Full-duplex simulation is usually implemented for wireless links by utilizing frequency division duplex (FDD) or space division duplex (SDD). In FDD, transmissions in different directions can operate at different carrier frequencies (e.g., within a paired spectrum). In SDD, transmissions in different directions on a given channel are separated from each other using spatial division multiplexing (SDM). In other examples, full-duplex communication may be implemented within an unpaired spectrum (e.g., within a single carrier bandwidth), where transmissions in different directions occur within different sub-bands of the carrier bandwidth. This type of full-duplex communication may be referred to herein as sub-band full-duplex (SBFD), also known as flexible duplex.

[0065] In some aspects of the present disclosure, the scheduling entity and / or the scheduled entity may be configured for beamforming and / or multiple-input multiple-output (MIMO) techniques. Figure 3 An example of a wireless communication system 300 supporting MIMO is illustrated. In a MIMO system, a transmitter 302 includes multiple transmit antennas 304 (e.g., N transmit antennas), and a receiver 306 includes multiple receive antennas 308 (e.g., M receive antennas). Thus, there are N×M signal paths 308 from the transmit antennas 304 to the receive antennas 310. Each of the transmitter 302 and the receiver 306 may be implemented, for example, in the scheduling entity 108, the scheduled entity 106, or any other suitable wireless communication device.

[0066] The use of such multi-antenna techniques enables wireless communication systems to exploit the spatial domain to support spatial multiplexing, beamforming, and transmit diversity. Spatial multiplexing can be used to transmit different data streams (also referred to as layers) simultaneously on the same time-frequency resources. These data streams can be transmitted to a single UE to increase the data rate or to multiple UEs to increase the total system capacity, the latter being referred to as multi-user MIMO (MU-MIMO). This is achieved by spatially precoding each data stream (e.g., multiplying the data streams by different weights and phase shifts) and then transmitting each spatially precoded stream through multiple transmit antennas on the downlink. The spatially precoded data streams arrive at the UE(s) with different spatial signatures, which enable each UE to recover one or more data streams intended for the UE. On the uplink, each UE transmits a spatially precoded data stream, which enables the base station to identify the source of each spatially precoded data stream.

[0067] The number of data streams or layers corresponds to the rank of the transmission. In general, the rank of the MIMO system 300 is limited to the lower of the number of transmit or receive antennas 304 or 308. In addition, the channel conditions at the UE and other considerations (such as the available resources at the base station) may also affect the transmission rank. For example, the rank (and therefore, the number of data streams) assigned to a specific UE on the downlink can be determined based on a rank indicator (RI) transmitted from the UE to the base station. The RI can be determined based on the antenna configuration (e.g., the number of transmit and receive antennas) and the measured signal to interference and noise ratio (SINR) on each receive antenna. The RI can indicate, for example, the number of layers that can be supported under the current channel conditions. The base station can use the RI together with resource information (e.g., available resources and the amount of data to be scheduled for the UE) to assign a transmission rank to the UE.

[0068] In a time division duplex (TDD) system, UL and DL are reciprocal, each using different time slots of the same frequency bandwidth. Therefore, in a TDD system, the base station may assign a rank for DL ​​MIMO transmission based on UL SINR measurements (e.g., based on a sounding reference signal (SRS) or other pilot signal transmitted from the UE). Based on the assigned rank, the base station may then transmit a CSI-RS using a separate C-RS sequence for each layer to provide multi-layer channel estimation. Based on the CSI-RS, the UE may measure the channel quality across layers and resource blocks and feed back CQI and RI values ​​to the base station for use in updating the rank and assigning REs for future downlink transmissions.

[0069] In the simplest case, Figure 3, a rank 2 spatial multiplexing transmission on a 2x2 MIMO antenna configuration will transmit one data stream from each transmit antenna 304. Each data stream arrives at each receive antenna 308 along a different signal path 310. The receiver 306 can then reconstruct the data streams using the signals received from each receive antenna 308.

[0070] Beamforming is a signal processing technique that can be used at a transmitter 302 or a receiver 306 to shape or direct an antenna beam (e.g., a transmit beam or a receive beam) along a spatial path between the transmitter 302 and the receiver 306. Beamforming can be achieved by combining signals communicated via antennas 304 or 308 (e.g., antenna elements of an antenna array module) so that some of these signals experience constructive interference and other signals experience destructive interference. In order to create the desired constructive / destructive interference, the transmitter 302 or the receiver 306 may apply an amplitude and / or phase offset to the signal transmitted or received from each of the antennas 304 or 308 associated with the transmitter 302 or the receiver 306. A beam may be formed by, but is not limited to, an antenna, an antenna port, an antenna element, an antenna group, an antenna port group, or an antenna element group. Alternatively, a reference signal resource may be used to form a beam. A beam may be equivalent to spatial domain filtering through which electromagnetic (EM) radiation is transmitted.

[0071] In 5G New Radio (NR) systems, especially for mmWave systems, beamformed signals can be used for most downlink channels, including the Physical Downlink Control Channel (PDCCH) and the Physical Downlink Shared Channel (PDSCH). In addition, broadcast information (such as SSB, CSI-RS, Slot Format Indicator (SFI), and paging information) can be transmitted in a beam-sweeping manner so that all scheduled entities (UEs) in the coverage area of ​​the Transmit Reception Point (TRP) (e.g., gNB) can receive the broadcast information. In addition, for UEs configured with beamforming antenna arrays, beamformed signals can also be used for uplink channels (including the Physical Uplink Control Channel (PUCCH) and the Physical Uplink Shared Channel (PUSCH)).

[0072] Figure 4 4 is a diagram illustrating communication between a base station 404 and a UE 402 using beamformed signals in accordance with some aspects. The base station 404 may be Figure 1-3 Any base station (e.g., gNB) or scheduling entity illustrated in FIG. 4 , and UE 402 may be Figure 1-3 Any UE or scheduled entity described in the description.

[0073] The base station 404 may generally be capable of communicating with the UE 402 using one or more transmit beams, and the UE 402 may further be capable of communicating with the base station 404 using one or more receive beams. As used herein, the term transmit beam refers to a beam on the base station 404 that can be used for downlink or uplink communication with the UE 402. Additionally, the term receive beam refers to a beam on the UE 402 that can be used for downlink or uplink communication with the base station 404.

[0074] exist Figure 4 In the example shown in, the base station 404 is configured to generate multiple transmit beams 406a, 406b, 406c, 406d, 406e, 406f, 406g and 406h (406a-406h), each of which is associated with a different spatial direction. In addition, the UE 402 is configured to generate multiple receive beams 408a, 408b, 408c, 408d and 408e (408a-408e), each of which is associated with a different spatial direction. It should be noted that although some beams are illustrated as being adjacent to each other, such arrangements may be different in different aspects. For example, the transmit beams 406a-406h transmitted during the same code element may not be adjacent to each other. In some examples, the base station 404 and the UE 402 may each transmit more or fewer beams distributed in all directions (e.g., 360 degrees) and in three dimensions. In addition, the transmit beams 406a-406h may include beams of various beam widths. For example, the base station 404 may transmit certain signals (e.g., synchronization signal blocks (SSBs)) on wider beams and other signals (e.g., CSI-RS) on narrower beams.

[0075] The base station 404 and the UE 402 may use a beam management procedure to select one or more transmit beams 406a-406h on the base station 404 and one or more receive beams 408a-408e on the UE 402 for communication of uplink and downlink signals therebetween. In one example, during initial cell acquisition, the UE 402 may perform a P1 beam management procedure to scan the multiple transmit beams 406a-406h on the multiple receive beams 408a-408e to select a beam pair link (e.g., one of the transmit beams 406a-406h and one of the receive beams 408a-408e) for a physical random access channel (PRACH) procedure for initial access to the cell. For example, periodic SSB beam sweeping may be implemented at certain intervals (e.g., based on SSB periodicity) on the base station 404. Thus, the base station 404 may be configured to sweep or transmit an SSB on each of the plurality of wider transmit beams 406a-406h during a beam sweep interval. The UE may measure the reference signal received power (RSRP) of each SSB transmit beam on each receive beam of the UE and select transmit and receive beams based on the measured RSRP. In an example, the selected receive beam may be the receive beam on which the highest RSRP is measured, and the selected transmit beam may have the highest RSRP measured on the selected receive beam.

[0076] After completing the PRACH procedure, the base station 404 and the UE 402 may perform a P2 beam management procedure for beam refinement at the base station 404. For example, the base station 404 may be configured to sweep or transmit CSI-RS on each of a plurality of narrower transmit beams 406a-406h. Each of the narrower CSI-RS beams may be a sub-beam of a selected SSB transmit beam (e.g., within a spatial direction of the SSB transmit beam). Transmission of the CSI-RS transmit beam may occur periodically (e.g., as configured by the gNB via radio resource control (RRC) signaling), semi-persistently (e.g., as configured by the gNB via RRC signaling and activated / deactivated via media access control-control element (MAC-CE) signaling), or aperiodically (e.g., as triggered by the gNB via downlink control information (DCI)). The UE 402 is configured to scan the multiple CSI-RS transmit beams 406a-406h across the multiple receive beams 408a-408e. The UE 402 then performs beam measurements (e.g., RSRP, SINR, etc.) on the CSI-RS received on each of the receive beams 408a-408e to determine the respective beam quality of each of the CSI-RS transmit beams 406a-406h, as measured on each of the receive beams 408a-408e.

[0077] The UE 402 may then generate and transmit to the base station 404 a layer 1 (L1) measurement report including a corresponding beam index (e.g., CSI-RS resource indicator (CRI)) and beam measurements (e.g., RSRP or SINR) for one or more of the CSI-RS transmit beams 406a-406h on one or more of the receive beams 408a-408e. The base station 404 may then select one or more CSI-RS transmit beams on which to communicate downlink and / or uplink control and / or data with the UE 402. In some examples, the selected CSI-RS transmit beam(s) have the highest RSRP from the L1 measurement report. The transmission of the L1 measurement report may occur periodically (e.g., as configured by the gNB via RRC signaling), semi-persistently (e.g., as configured by the gNB via RRC signaling and activated / deactivated via MAC-CE signaling), or aperiodically (e.g., triggered by the gNB via DCI).

[0078] UE 402 may further select a corresponding receive beam on UE 402 for each selected serving CSI-RS transmit beam to form a corresponding beam pair link (BPL) for each selected serving CSI-RS transmit beam. For example, UE 402 may utilize beam measurements obtained during a P2 procedure or perform a P3 beam management procedure to obtain new beam measurements for the selected CSI-RS transmit beam to select a corresponding receive beam for each selected transmit beam. In some examples, the selected receive beam to be paired with a particular CSI-RS transmit beam may be the receive beam on which the highest RSRP is measured for the particular CSI-RS transmit beam.

[0079] In some examples, in addition to performing CSI-RS beam measurements, the base station 404 may also configure the UE 402 to perform SSB beam measurements and provide an L1 measurement report containing beam measurements of the SSB transmit beams 406a-406h. For example, the base station 404 may configure the UE 402 to perform SSB beam measurements and / or CSI-RS beam measurements for beam failure detection (BRD), beam failure recovery (BFR), cell reselection, beam tracking (e.g., for mobile UE 402 and / or base station 404), or other beam optimization purposes.

[0080] In addition, when the channel is reciprocal, an uplink beam management scheme may be used to select transmit beams and receive beams. In an example, the UE 402 may be configured to sweep or transmit on each of the multiple receive beams 408a-408e. For example, the UE 402 may transmit SRS on each beam in different beam directions. In addition, the base station 404 may be configured to receive uplink beam reference signals on multiple transmit beams 406a-406h. The base station 404 then performs beam measurements (e.g., RSRP, SINR, etc.) on the beam reference signals on each of the transmit beams 406a-406h to determine the respective beam quality of each of the receive beams 408a-408e, as measured on each of the transmit beams 406a-408e.

[0081] The base station 404 may then select one or more transmit beams on which to communicate downlink and / or uplink control and / or data with the UE 402. In some examples, the selected transmit beam(s) have the highest RSRP. The UE 402 may then select a corresponding receive beam for each selected serving transmit beam to form a respective beam pair link (BPL) for each selected serving transmit beam using, for example, the P3 beam management procedure as described above.

[0082] In one example, a single CSI-RS transmit beam (e.g., beam 406d) on the base station 404 and a single receive beam (e.g., beam 408c) on the UE may form a single BPL for communication between the base station 404 and the UE 402. In another example, multiple CSI-RS transmit beams (e.g., beams 406c, 406d, and 406e) on the base station 404 and a single receive beam (e.g., beam 408c) on the UE 402 may form respective BPLs for communication between the base station 404 and the UE 402. In another example, multiple CSI-RS transmit beams (e.g., beams 406c, 406d, and 406e) on the base station 404 and multiple receive beams (e.g., beams 408c and 408d) on the UE 402 may form multiple BPLs for communication between the base station 404 and the UE 402. In this example, a first BPL may include a transmit beam 406c and a receive beam 408c, a second BPL may include a transmit beam 408d and a receive beam 408c, and a third BPL may include a transmit beam 408e and a receive beam 408d.

[0083] Will refer to Figure 5Various aspects of the present disclosure are described using OFDM waveforms schematically illustrated in FIG. It will be appreciated by those skilled in the art that various aspects of the present disclosure may be applied to SC-FDMA waveforms in substantially the same manner as described below. That is, while some examples of the present disclosure may focus on OFDM links for clarity, it will be appreciated that the same principles may also be applied to SC-FDMA waveforms.

[0084] Now refer to Figure 5 , illustrates an expanded view of an exemplary DL subframe 502 showing an OFDM resource grid. However, as will be readily appreciated by those skilled in the art, the PHY transmission structure for any particular application may differ from the examples described herein depending on any number of factors. Here, time is in the horizontal direction in units of OFDM symbols; and frequency is in the vertical direction in units of subcarriers.

[0085] Resource grid 504 can be used to schematically represent the time-frequency resources for a given antenna port. That is, in a multiple-input multiple-output (MIMO) implementation with multiple antenna ports available, there may be a corresponding multiple number of resource grids 504 available for communication. Resource grid 504 is divided into multiple resource elements (REs) 506. RE (which is 1 subcarrier × 1 symbol) is the smallest discrete part of the time-frequency grid and contains a single complex value representing data from a physical channel or signal. Depending on the modulation utilized in a particular implementation, each RE may represent one or more information bits. In some examples, a block of REs may be referred to as a physical resource block (PRB) or resource block (RB) 508, which contains any suitable number of consecutive subcarriers in the frequency domain. In one example, an RB may include 12 subcarriers, which number is independent of the parameter set used. In some examples, depending on the parameter set, an RB may include any suitable number of consecutive OFDM symbols in the time domain. In the present disclosure, it is assumed that a single RB (such as RB508) corresponds entirely to a single communication direction (transmission or reception for a given device).

[0086] Scheduling a UE (e.g., a scheduled entity) for downlink or uplink transmission typically involves scheduling one or more resource elements 506 within one or more subbands. Thus, the UE typically utilizes only a subset of the resource grid 504. In some examples, an RB may be the smallest resource unit that may be allocated to a UE. Thus, the more RBs scheduled for a UE and the higher the modulation scheme selected for the air interface, the higher the data rate for the UE.

[0087] In this illustration, RB 508 is shown as occupying less than the entire bandwidth of subframe 502, with some subcarriers illustrated above and below RB 508. In a given implementation, subframe 502 may have a bandwidth corresponding to any number of one or more RBs 508. Furthermore, in this illustration, RB 508 is shown as occupying less than the entire duration of subframe 502, but this is merely one possible example.

[0088] Each 1 ms subframe 502 may include one or more adjacent time slots. Figure 5 In the example shown in , a subframe 502 includes four time slots 510. In some examples, a time slot may be defined according to a specified number of OFDM symbols with a given cyclic prefix (CP) length. For example, a time slot may include 7 or 14 OFDM symbols with a nominal CP. Additional examples may include mini-slots (sometimes referred to as shortened transmission time intervals (TTIs)) with shorter durations (e.g., one to three OFDM symbols). In some cases, these mini-slots or shortened transmission time intervals (TTIs) may occupy resources scheduled for ongoing time slot transmissions for the same or different UEs to transmit. Any number of resource blocks may be utilized within a subframe or time slot.

[0089] An expanded view of one of the time slots 510 illustrates that the time slot 510 includes a control region 512 and a data region 514. In general, the control region 512 may carry control channels, while the data region 514 may carry data channels. Of course, a time slot may contain full DL, full UL, or at least one DL portion and at least one UL portion. Figure 5 The structure illustrated in is merely exemplary in nature, and different slot structures may be utilized and may include one or more for each of the control region and the data region.

[0090] Although not in Figure 5 506, but each RE 508 within the RB 506 may be scheduled to carry one or more physical channels, including a control channel, a shared channel, a data channel, etc. Other REs 508 within the RB 506 may also carry pilot or reference signals. These pilot or reference signals may be used by the receiving device to perform channel estimation for the corresponding channel, which may enable coherent demodulation / detection of the control and / or data channels within the RB 508.

[0091] In some examples, time slot 510 may be used for broadcast or unicast communication. For example, broadcast, multicast, or groupcast communication may refer to point-to-multipoint transmission from one device (e.g., a base station, UE, or other similar device) to other devices. Here, broadcast communication is delivered to all devices, while multicast communication is delivered to multiple intended recipient devices. Unicast communication may refer to point-to-point transmission from one device to a single other device.

[0092] In an example of cellular communication on a cellular carrier via a Uu interface, for DL ​​transmission, a scheduling entity (e.g., a base station) may allocate one or more REs 506 (e.g., within a control region 512) to one or more scheduled entities (e.g., UEs) to carry DL control information, which includes one or more DL control channels, such as a physical downlink control channel (PDCCH). The PDCCH carries downlink control information (DCI), which includes, but is not limited to, power control commands (e.g., one or more open-loop power control parameters and / or one or more closed-loop power control parameters) for DL ​​and UL transmissions, scheduling information, grants, and / or assignments of REs. The PDCCH may further carry HARQ feedback transmissions, such as an acknowledgment (ACK) or a negative acknowledgment (NACK). HARQ is a well-known technique to those of ordinary skill in the art, wherein for accuracy, the integrity of packet transmissions may be checked at the receiving side, for example, using any suitable integrity check mechanism (such as a checksum or a cyclic redundancy check (CRC)). If the integrity of the transmission is confirmed, an ACK may be transmitted, and if it is not confirmed, a NACK may be transmitted. In response to the NACK, the transmitting device may send a HARQ retransmission, which may enable chase combining, incremental redundancy, and the like.

[0093] The base station may further allocate one or more REs 506 (e.g., in the control region 512 or the data region 514) to carry other DL signals, such as a demodulation reference signal (DMRS); a phase tracking reference signal (PT-RS); a channel state information (CSI) reference signal (CSI-RS); and a synchronization signal block (SSB). The SSB may be broadcast at regular intervals based on a periodicity (e.g., 5, 10, 20, 40, 80, or 140 milliseconds). The SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast control channel (PBCH). The UE may utilize the PSS and SSS to achieve radio frame, subframe, time slot, and symbol synchronization in the time domain, identify the center of the channel (system) bandwidth in the frequency domain, and identify the physical cell identity (PCI) of the cell.

[0094] The PBCH in the SSB may further include: a master information block (MIB), which includes various system information and parameters for decoding a system information block (SIB). The SIB may be, for example, a system information type 1 (SystemInformationType1) (SIB1), which may include various additional system information. Examples of system information transmitted in the MIB may include, but are not limited to, subcarrier spacing, system frame number, configuration of a PDCCH control resource set (CORESET) (e.g., PDCCH CORESET0), and a search space of SIB1. Examples of additional system information transmitted in SIB1 may include, but are not limited to, random access search space, downlink configuration information, and uplink configuration information. MIB and SIB1 together provide minimum system information (SI) for initial access.

[0095] In UL transmission, the scheduled entity (e.g., UE) may utilize one or more REs 506 to carry UL control information (UCI) to the scheduling entity, which includes one or more UL control channels, such as a physical uplink control channel (PUCCH). The UCI may include various packet types and categories, including pilots, reference signals, and information configured to implement or assist in decoding uplink data transmission. Examples of uplink reference signals may include sounding reference signals (SRS) and uplink DMRS. In some examples, the UCI may include a scheduling request (SR), for example, a request for the scheduling entity to schedule an uplink transmission. Here, in response to the SR transmitted on the UCI, the scheduling entity may transmit downlink control information (DCI), which may schedule resources for uplink packet transmission. The UCI may also include HARQ feedback, channel state feedback (CSF) such as a CSI report, or any other suitable UCI.

[0096] In addition to control information, one or more REs 506 (e.g., within the data region 514) may also be allocated for data traffic. Such data traffic may be carried on one or more traffic channels, such as a physical downlink shared channel (PDSCH) for DL ​​transmissions or a physical uplink shared channel (PUSCH) for UL transmissions. In some examples, one or more REs 506 within the data region 514 may be configured to carry other signals, such as one or more SIBs and DMRS.

[0097] In an example of sidelink communication on a sidelink carrier via a proximity service (ProSe) PC5 interface, the control region 512 of the time slot 510 may include a physical sidelink control channel (PSCCH), which includes sidelink control information (SCI) transmitted by an initiator (transmitter) sidelink device (e.g., V2X or other sidelink device) to a set of one or more other receiver sidelink devices. The data region 514 of the time slot 510 may include a physical sidelink shared channel (PSSCH), which includes sidelink data traffic transmitted by the initiator (transmitter) sidelink device via SCI in reserved resources on the sidelink carrier. Other information may be further transmitted by each RE 506 within the time slot 510. For example, HARQ feedback information may be transmitted from the receiver sidelink device to the transmitter sidelink device in a physical sidelink feedback channel (PSFCH) within the time slot 510. In addition, one or more reference signals, such as sidelink SSB and / or sidelink CSI-RS, may be transmitted within the time slot 510.

[0098] These physical channels are generally multiplexed and mapped to transport channels for handling by the medium access control (MAC) layer. The transport channels carry information blocks, which are called transport blocks (TBs). The transport block size (TBS), which may correspond to the number of information bits, may be a controlled parameter based on the modulation and coding scheme (MCS) and the number of RBs in a given transmission.

[0099] The channels or carriers described herein are not necessarily all of the channels or carriers that may be utilized between a scheduling entity and a scheduled entity, and one of ordinary skill in the art will recognize that other channels or carriers may be utilized in addition to those illustrated, such as other traffic, control, and feedback channels.

[0100] In OFDM, in order to maintain the orthogonality of subcarriers or frequency modulation, the subcarrier spacing may be equal to the inverse of the symbol period. The parameter set of an OFDM waveform refers to its specific subcarrier spacing and cyclic prefix (CP) overhead. The scalable parameter set refers to the ability of the network to select different subcarrier spacings and correspondingly select the corresponding symbol duration (including CP length) for each spacing. With the scalable parameter set, the nominal subcarrier spacing (SCS) can be scaled up or down by integer multiples. In this way, regardless of the CP overhead and the selected SCS, the symbol boundaries can be aligned at certain common multiples of the symbols (for example, aligned at the boundaries of each 1ms subframe). The range of SCS may include any suitable SCS. For example, a scalable parameter set may support an SCS ranging from 15kHz to 480kHz.

[0101] To explain this concept of scalable parameter sets, Figure 6A first RB 602 having a nominal parameter set and a second RB 604 having a scaled parameter set are shown. As an example, the first RB 602 may have a 'nominal' subcarrier spacing (SCS) of 30 kHz. n ) and a 'nominal' symbol duration of 333 μs n Here, in the second RB 604, the scaled parameter set includes twice the nominal SCS or 2×SCS n =60kHz scaled SCS. Because this provides twice the bandwidth per symbol, this results in a shortened symbol duration to carry the same information. Thus, in the second RB 604, the scaled parameter set includes half of the nominal symbol duration, or (symbol duration n )÷2=scaled symbol duration of 167μs.

[0102] 5G-NR networks may further support carrier aggregation of component carriers transmitted from different transmit reception points (TRPs) in a multi-cell transmission environment. Figure 7 7 shows an example of a multi-cell transmission environment 700. The multi-cell transmission environment 700 includes a primary serving cell (PCell) 702 and one or more secondary serving cells (SCells) 706a, 706b, 706c, and 706d. The PCell 702 may be referred to as an anchor cell, which provides a radio resource control (RRC) connection with a UE 710. In some examples, the PCell and one or more SCells may be co-located (e.g., different transmit reception points (TRPs) may be located at the same location).

[0103] When carrier aggregation is configured, one or more of the SCells 706a-706d may be activated or added to the PCell 702 to form a serving cell serving the UE 710. Each serving cell corresponds to a component carrier (CC). The CC of the PCell 702 may be referred to as a primary CC, and the CCs of the SCells 706a, 706b, 706c, and 706d (706a-706d) may be referred to as secondary CCs. The PCell 702 and one or more SCells 706 may be served by corresponding TRPs 704 and 708a-708c. Each TRP 704 and 708a-708c may be a base station (e.g., a gNB), a remote radio head of a gNB, or a similar TRP. Figure 1-4 In some examples, a base station may include multiple TRPs, each TRP corresponding to one of multiple co-located or non-co-located antenna arrays, each antenna array supporting a different component carrier. Figure 7, SCells 706a-706c are served by corresponding non-co-located TRPs 708a-708c. In addition, SCell 706d and PCell 702 are co-located and served by corresponding co-located TRPs 704 (only one of which is shown for convenience). Here, each of the TRPs serving cells 702 and 706d may be associated with a single base station 704. The coverage of PCell 702 and SCell 706d may be different because component carriers in different frequency bands may experience different path losses.

[0104] PCell 702 may add or remove one or more of SCells 706a-706d to improve the reliability of the connection to UE 710 and / or increase the data rate. However, PCell 702 may only be changed when switching to another PCell. In some examples, PCell 702 may utilize a first radio access technology (RAT), such as LTE, and one or more SCells 706 may utilize a second RAT, such as 5G-NR. In this example, a multi-cell transmission environment may be referred to as a multi-RAT-dual connectivity (MR-DC) environment. In some examples, PCell 702 may be a low-band cell, and SCell 706 may be a high-band cell. A low-band (LB) cell uses a CC in a frequency band lower than that of a high-band cell. For example, a high-band cell may each use a corresponding millimeter wave CC (e.g., FR2 or higher), and a low-band cell may use a CC in a lower frequency band (e.g., a sub-6 GHz band or FR1). Typically, a cell using FR2 or higher CCs can provide a larger bandwidth than a cell using FR1 CCs. In addition, when using carriers with frequencies above 6 GHz (e.g., mmWave), beamforming can be used to transmit and receive signals. Therefore, 5G networks can provide aggregation of carriers, all of which are controlled by a single integrated MAC layer. Aggregated CCs can be contiguous or non-contiguous to each other, and they can be inter-band or intra-band. In addition, aggregated CCs can use different parameter sets, for example, with different subcarrier spacing (SCS), time slot lengths, etc.

[0105] The PCell 702 is responsible not only for connection establishment, but also for radio resource management (RRM) and radio link monitoring (RLM) of the connection with the UE 710. For example, the PCell 702 may activate one or more SCells (e.g., SCell 706a) for multi-cell communication with the UE 710. In some examples, the PCell may activate the SCell 706a as needed, rather than maintaining the SCell activated when the SCell 706a is not used for data transmission / reception, to reduce power consumption of the UE 710.

[0106] In 5G NR, antenna ports may be used to transmit physical channels and reference signals. If the properties of the channel over which symbols on one antenna port are communicated can be inferred from the channel over which symbols on another antenna port are communicated, then the two antenna ports may be referred to as quasi-co-located (QCL). Thus, if the two antenna ports are QCL, a receiving device detecting the channel properties of a signal from one antenna port may apply those channel properties to detecting a signal from another antenna port of the QCL.

[0107] Using QCL antenna ports, the base station can provide the UE with a set of transmission configuration indication (TCI) state configurations in a downlink control information (DCI) message. Each TCI state configuration may include parameters for configuring the QCL relationship between one or two downlink reference signals and the DM-RS port of the PDSCH, the DM-RS port of the PDCCH, or the CSI-RS port(s) of the CSI-RS resource. In addition, the TCI state may include a beam indication. In this way, the base station can inform the UE that a certain PDSCH and / or PDCCH transmission uses the same transmit beam as the configured reference signal. Therefore, the TCI state may include a beam indication that explicitly identifies which downlink beam the base station is using.

[0108] Once these TCI state configurations are provided to the UE, the base station may activate or deactivate the provided TCI states for a given UE by transmitting a specific MAC control element (MAC-CE), which may be referred to as "TCI States Activation / Deactivation for UE-specific PDSCH MAC-CE" in Section 6.1.3.14 of 3GPP TS 38.321. The MAC-CE may be identified by a MAC subheader that includes a serving cell ID, a bandwidth part (BWP) ID, and a parameter T i , the parameter T i Indicates the activation or deactivation state of the TCI state with TCI state Id i. Here, i is an integer index value that indexes the TCI state list previously provided to the UE.

[0109] One aspect of the MAC-CE may be that the MAC-CE activates the TCI state only for the identified component carrier (CC) or bandwidth part (BWP). That is, because the MAC-CE only makes room for a single BWP ID, a separate such MAC-CE may be required for each CC or BWP.

[0110] When CA is implemented, the base station may use RRC signaling to provide a set of component carrier (CC) lists to the UE. These lists are non-overlapping. For example, the first CC list indicates CC1-CC7, while the second CC list indicates CC8-CC15.

[0111] In the group CC based beam update procedure, when the TCI state ID set for a given PDSCH is activated by a MAC-CE for a CC / BWP set (at least for the same frequency band), and if the applicable CC list is indicated by RRC signaling, the same TCI state ID set may be applied for all BWPs in the CC. In some aspects, the same TCI state ID set may be applied for all CCs in the CC list including the CC. Thus, if a CC is included in a CC list indicated by RRC signaling from the base station to the UE, the TCI state set may be applied to all CCs in the CC list, as well as all BWPs in all those CCs. In this way, the base station may not be required to provide a separate MAC-CE to activate a certain TCI state in all BWPs or CCs.

[0112] In some aspects, up to 2 CC lists may be configured per UE via RRC for the purpose of simultaneous TCI state activation across multiple CC / BWPs. The UE may determine which list to apply the TCI state activation to via the CC indicated in the MAC-CE. In some examples, the UE may expect that there are no overlapping CCs in multiple RRC configured CC lists. Spatial relationship information may refer to beamforming properties of uplink signals, such as departure angle and average departure angle from the UE. When spatial relationship information is activated for periodic / aperiodic (SP / AP) sounding reference signal (SRS) resources by a MAC-CE for a set of CC / BWPs for at least the same frequency band, the spatial relationship information (SpatialRelation Info) may be applied to the SP / AP SRS resources with the same SRS resource ID for all BWPs in the indicated CC, if the applicable CC list is indicated by RRC signaling.

[0113] In some aspects, for the purpose of simultaneous spatial relation updates across multiple CCs / BWPs, up to 2 CC lists may be configured per UE via RRC. The UE may determine which list to apply the spatial relation update to via the CC indicated in the MAC-CE. The UE may expect no overlapping CCs in multiple RRC configured CC lists. Here, these lists may be independent of the lists used for simultaneous TCI state activation.

[0114] In 5G NR, beam failure detection and recovery procedures may be used. For example, beam failure detection and recovery procedures are defined in TS 38.321 Section 5.17, Release 15 and Release 16. In general, a beam failure may correspond to a condition where the beam quality has dropped to an unacceptably low level. In one example, the UE may consider a beam failure instance to have occurred when the measured quality of a downlink reference signal drops below a given threshold (e.g., a predetermined threshold). In some examples, the UE may utilize a measurement of the reference signal received power (RSRP) corresponding to a received CSI-RS or SS block. Once the UE detects a given number (e.g., a predetermined number) of consecutive such beam failure instances, the UE may then declare a beam failure and initiate a beam failure recovery (BFR) procedure accordingly. .

[0115] According to one example of the BFR procedure, the UE may search for new candidate beams to restore connectivity. Here, the UE may measure the quality (e.g., RSRP) of one or more reference signals on a given set of candidate beams. If the measured quality is greater than a certain threshold (e.g., a predetermined threshold), the beam is considered to be a beam on which connectivity can be restored.

[0116] Once the UE identifies such candidate beams, the UE may trigger the transmission of a BFR request to notify the base station that the UE has detected a beam failure. Here, the BFR request message may include information identifying the candidate beams found in the UE's candidate beam search. In some examples, the UE may transmit the BFR request using a random access procedure. An example of a random access procedure is a procedure in which the UE transmits a random access preamble and a payload (msgA). If the base station detects the random access preamble and decodes the payload, the base station responds by transmitting a random access response (RAR, or msgB).

[0117] In some examples, corresponding to the BFR procedure, the payload of the UE's random access message (msgA) may include information identifying the candidate beams found in the UE's candidate beam search. For example, each candidate beam may be associated with a specific random access preamble configuration, so that the base station can receive the UE's identified candidate beam by detecting the specific random access preamble configuration. In some examples, the payload of the UE's random access message may be referred to as "Step 2 MAC-CE". Here, Step 2 may refer to a series of steps in the UE's BFR procedure. In addition, the random access response transmitted by the base station may be referred to as a BFR response.

[0118] After the UE receives a predetermined number of symbols after the secondary cell (SCell) BFR response to step 2 MAC-CE, the beams of all CORESETs in the failed SCell may be reset to the new beams reported in step 2 MAC-CE. Therefore, in each SCell, if there is a beam failure, the UE may transmit beam candidates to the base station via a BFR message (step 2 MAC-CE), and the base station may transmit a BFR response. After receiving the BFR response, the UE may wait for a predetermined number of symbols. After waiting for a predetermined number of symbols after receiving the BFR response, the UE may apply the identified downlink beams communicated to the base station for all CORESETs in the failed SCell.

[0119] In addition, for 5G NR, at least for PDCCH, after a predetermined number of symbols after receiving the BFR response to step 2 MAC-CE, if a new beam is identified, the UE may apply the new beam indicated in step 2 MAC-CE, at least for DL ​​reception on the failed SCell. This may be applied for all CORESETs in the failed SCell.

[0120] In some aspects, the UE may receive a TCI state activation / deactivation for a UE-specific PDSCH MAC_CE identifying a given CC. After receiving the step 2 MAC-CE response, and group CC-based beam updating is not specified, the UE may apply the same TCI state set to all CCs in the same CC list as the identified CC.

[0121] In some aspects, after a predetermined number of symbols after receiving a BFR response from the base station, the UE may apply the new beam indicated in step 2 MAC-CE to at least DL reception on the failed SCell. In some aspects, this procedure may be extended when a group CC-based beam update procedure is used. For example, after a predetermined number of symbols after receiving a SCell BFR response to step 2 MAC-CE indicating a failed CC with an identified new beam, if the base station has indicated an applicable CC list including the reported failed CC, the UE may apply the new beam identified in step 2 MAC-CE to each CC in the applicable CC list. Therefore, when the UE reports a beam failure corresponding to a given CC corresponding to an SCell, the base station may respond with a new beam for that particular SCell. Here, if such a CC list is configured, the UE may apply the new beam to the entire list of CCs in the same CC list.

[0122] In some examples, the base station may indicate whether the one or more reset beams are applied to each CC in the CC list or only to the faulty CC. For example, the base station may provide an information element using any suitable control message (e.g., radio resource control (RRC), MAC-CE, downlink control information (DCI), etc.), which indicates how the one or more reset beams are to be applied, whether to each CC in the CC list or only to the faulty CC.

[0123] As described herein, after receiving a BFR response, the UE may apply to downlink control channel (PDCCH) transmissions using a beam resetting procedure. However, if the applicable CC list is used for group CC-based beam updates in the DL (e.g., the same set of activated TCI state IDs will be applied to all CCs in the group), the one or more resetting beams may be applied to all DL signals and channels, including, for example, all CORESETs, PDSCHs, CSI-RSs, etc. If the applicable CC list is used for group CC-based beam updates in the UL (e.g., the same spatial relationship information is applied to the same SRS resource ID on all CCs in the group), the one or more resetting beams may be applied to all UL signals and channels, including SRS, PUCCH, PUSCH, etc.

[0124] Figure 8 is a conceptual signaling diagram illustrating an example environment 800 for beam resetting in accordance with some aspects. Figure 8 In the example shown in FIG. 8 , a user equipment (UE) 802 communicates wirelessly with a base station 804 via one or more wireless communication links. Each of the UE 802 and the base station 804 may correspond to a Figure 1-4 and any of the entities shown in 7, g B node, UE, etc.

[0125] At 806, UE 802 may identify a list of multiple component carriers. For example, UE 802 may receive a list of multiple component carriers from base station 804 and identify the multiple component carriers from the list. In some aspects, during carrier aggregation (CA), base station 804 may provide one or more component carrier (CC) list sets to UE 802 using, for example, radio resource control (RRC) signaling. When there are multiple lists, the lists may not overlap. For example, base station 804 may transmit a first CC list indicating component carriers 1-7 (e.g., CC1-CC7) and a second CC list indicating component carriers 8-15 (e.g., CC8-CC15).

[0126] In some aspects, when a group CC-based beam update procedure is implemented and a TCI state identification (ID) set for a given PDSCH is activated by a MAC-CE for a CC / BWP set (at least for the same frequency band), the same TCI state ID set may be applied for all BWPs in the CC and also for all CCs in the CC list including the CC, if the applicable CC list is indicated by RRC signaling. Thus, if a CC is included in a CC list indicated by RRC signaling from the base station 804 to the UE 802, the TCI state set may be applied to all CCs in the CC list, as well as all BWPs in all those CCs. Thus, the base station 804 may not be required to provide a separate MAC-CE to activate a certain TCI state in all BWPs or CCs.

[0127] In some aspects, up to two CC lists may be configured per UE 802 via RRC for the purpose of simultaneous TCI state activation across multiple CCs / BWPs. The UE 802 may determine which list to apply the TCI state activation to via the CC indicated in the MAC-CE. The UE 802 may desire no overlapping CCs in multiple RRC configured CC lists. When spatial relationship information is activated for periodic / aperiodic (SP / AP) sounding reference signal (SRS) resources by a MAC-CE for at least a set of CCs / BWPs for the same frequency band, when the applicable CC list is indicated by RRC signaling, the spatial relationship information may be applied to the SP / AP SRS resources with the same SRS resource ID for all BWPs in the indicated CC.

[0128] In some aspects, for the purpose of simultaneous spatial relation updates across multiple CCs / BWPs, up to two CC lists may be configured per UE 802 via RRC. The UE 802 may determine which list to apply the spatial relation update to via the CC indicated in the MAC-CE. In some examples, the UE 802 may not receive overlapping CCs in multiple RRC configured CC lists. These lists may be independent of those used for simultaneous TCI state activation.

[0129] In some aspects, the list may be used for group CC-based beam updates on the downlink. For example, after receiving the BFR response, the UE 902 may use a beam resetting procedure for downlink control channel (PDCCH) transmissions. However, if the applicable CC list is used for group CC-based beam updates in the DL (e.g., the same set of activated TCI state IDs will be applied to all CCs in the group), the one or more reset beams may be applied to all DL signals and channels, including, for example, all CORESETs, PDSCHs, CSI-RSs, etc. In some aspects, the list may be used for group CC-based beam updates on the uplink. For example, if the applicable CC list is used for group CC-based beam updates in the UL (e.g., the same spatial relationship information is applied to the same SRS resource ID on all CCs in the group), the one or more reset beams may be applied to all UL signals and channels, including SRS, PUCCH, PUSCH, etc.

[0130] At 808, the UE 802 may detect a beam failure on a first component carrier of the multiple component carriers. In some aspects, the UE 802 may deem a beam failure instance to have occurred when a measured quality of a downlink reference signal drops below a given threshold (e.g., a predetermined threshold). In some aspects, the UE 802 may utilize a measurement of a reference signal received power (RSRP) corresponding to a received CSI-RS or SSB. Once the UE 802 detects a given number (e.g., a predetermined number) of consecutive such beam failure instances, the UE 802 may then declare a beam failure. Examples of beam failure detection and recovery procedures may be defined in 3GPP TS 38.321 Section 5.17, Release 15 and Release 16. Upon detecting a beam failure, the UE 802 may initiate a beam failure recovery (BFR) procedure.

[0131] At 810, UE 802 may transmit a beam failure recovery (BFR) request. In some aspects, UE 802 may transmit a BFR request in response to detecting a beam failure. For example, upon detecting a beam failure, UE 802 may search for candidate beams for which connectivity is to be restored. UE 802 may measure the quality (e.g., RSRP) of one or more reference signals on a given set of candidate beams received from base station 804. If the measured quality is greater than a threshold (e.g., a predetermined threshold), the beam may be designated as a candidate beam and may be used to restore connectivity. Once UE 802 identifies a candidate beam, UE 802 may trigger transmission of a beam failure recovery request to notify base station 804 that UE 802 has detected a beam failure. In some aspects, the beam failure recovery request may include information identifying a candidate beam found by UE 802 during a candidate beam search. In some aspects, UE 802 may transmit the beam failure recovery request to base station 804 using a random access procedure. For example, UE 802 may implement a random access procedure by transmitting a random access preamble and a payload (msgA) to base station 804. If base station 804 detects the random access preamble and decodes the payload, base station 804 may transmit RAR or message B (msgB) to UE 802.

[0132] In some aspects, the payload of the random access message (msgA) transmitted by the UE 802 may include information identifying the candidate beams. In some examples, each candidate beam may be associated with a specific random access preamble configuration. Thus, the base station 804 may receive an indication of the candidate beams identified by the UE 802 based on detecting the specific random access preamble configuration associated with the candidate beam. In some examples, the payload of the random access message transmitted by the UE 802 may be a media access control (MAC) control element (MAC-CE) (e.g., step 2 MAC-CE). In some aspects, the MAC-CE may refer to a series of steps in a beam failure recovery (BFR) procedure implemented by the UE 802. In addition, the random access response transmitted by the base station 804 may be referred to as a BFR response.

[0133] At 812, the base station 804 may transmit a beam failure recovery response. In some aspects, the base station 804 may transmit a beam failure recovery response indicating whether a beam failure recovery request is received. For example, after a predetermined number of symbols after the UE 802 receives a BFR response (e.g., a secondary cell (SCell) BFR response) to the step 2 MAC-CE, the beams of all CORESETs in the failed SCell may be reset to the new beams (e.g., candidate beams) reported in the step 2 MAC-CE or applied to the new beams. Therefore, in each cell (e.g., SCell), if there is a beam failure, the UE 802 may transmit an indication of the candidate beams to the base station 804 via a BFR message (step 2 MAC-CE), and the base station 804 may transmit a BFR response. After receiving the BFR response, the UE 802 may wait for a predetermined number of symbols. After waiting a predetermined number of symbols after receiving the BFR response, the UE 802 may reset or apply the identified candidate beams (e.g., downlink beams) communicated to the base station 804 for all CORESETs in the failed cell (e.g., SCell). In some aspects, the term "resetting" may include applying a candidate beam to at least one component carrier.

[0134] At 814, UE 802 may apply the candidate beam to at least one of the plurality of component carriers. For example, for 5G NR, at least for PDCCH, after a predetermined number of symbols after receiving the BFR response to step 2 MAC-CE, if a new beam is identified, then at least for DL ​​reception on the failed cell (e.g., SCell), UE 802 may apply the new beam indicated in step 2 MAC-CE. This may be applied to all CORESETs in the failed cell.

[0135] In conjunction with this beam resetting rule, group CC based beam updating may be used after receiving the step 2 MAC-CE response. For example, if UE 802 receives a TCI state activation / deactivation of a UE-specific physical downlink shared channel (PDSCH) MAC-CE identifying a given CC, UE 802 may apply the same TCI state set to all CCs in the same CC list as the identified CC.

[0136] In some aspects, after a predetermined number of symbols after receiving the BFR response from the base station, the UE 802 may apply the new beam indicated in step 2 MAC-CE to at least DL reception on the failed cell (e.g., SCell). In some aspects, this procedure may be extended when a group CC-based beam update procedure is used. For example, after a predetermined number of symbols after receiving the SCell BFR response to step 2 MAC-CE indicating the failed CC with the identified new beam, if the base station 804 has indicated an applicable CC list including the reported failed CC, the UE 802 may apply the new beam identified in step 2 MAC-CE to each CC in the applicable CC list. Thus, when the UE 802 reports a beam failure corresponding to a given CC corresponding to the SCell, the base station 804 may respond with a new beam for the particular SCell. If such a CC list is configured, the UE 802 may apply the new beam to the entire list of CCs in the same CC list.

[0137] As described herein, after receiving the BFR response, the UE 902 may use a beam resetting procedure for downlink control channel (PDCCH) transmissions. However, if the applicable CC list is used for group CC-based beam updating in the DL (e.g., the same set of activated TCI state IDs will be applied to all CCs in the group), the one or more resetting beams may be applied to all DL signals and channels, including, for example, all CORESETs, PDSCHs, CSI-RSs, etc. If the applicable CC list is used for group CC-based beam updating in the UL (e.g., the same spatial relationship information is applied to the same SRS resource ID on all CCs in the group), the one or more resetting beams may be applied to all UL signals and channels, including SRS, PUCCH, PUSCH, etc.

[0138] In some examples, the base station 804 may indicate whether the one or more reset beams are applied to each CC in the CC list or only to the failed CC. For example, the base station 804 may provide an information element to the UE 802 using any suitable control message (e.g., radio resource control (RRC), MAC-CE, downlink control information (DCI), etc.), which indicates how the UE 802 is to apply the one or more reset beams, whether to apply to each CC in the CC list or only to the failed CC.

[0139] In some aspects, the UE 802 may apply the candidate beam to each of the plurality of component carriers included in the list. For example, the base station 804 may transmit an application indication indicating whether the UE 802 is to apply the candidate beam to each of the plurality of component carriers or to apply the candidate beam only to the first component carrier of the plurality of component carriers. When the application indication indicates that the UE 802 is to apply the candidate beam to each of the plurality of component carriers, the UE 802 may receive the application indication from the base station 804 and apply the candidate beam to each of the plurality of component carriers included in the list. In some aspects, the base station 804 may transmit the application indication to the UE 802 using at least one of a radio resource control (RRC) message, a MAC CE, or downlink control information (DCI).

[0140] In some aspects, the UE 802 may apply the candidate beam only to a first component carrier of the plurality of component carriers included in the list. For example, the base station 804 may transmit an application indication indicating whether the UE 802 is to apply the candidate beam to each of the plurality of component carriers or to apply the candidate beam only to the first component carrier of the plurality of component carriers. When the application indication indicates that the UE 802 is to apply the candidate beam only to the first component carrier of the plurality of component carriers, the UE 802 may receive the application indication from the base station 804 and apply the candidate beam only to the first component carrier of the plurality of component carriers included in the list. In some aspects, the base station 804 may transmit the application indication to the UE 802 using at least one of a radio resource control (RRC) message, a MAC CE, or downlink control information (DCI).

[0141] Fig. 9 is a conceptual signaling diagram illustrating an example environment 900 for beam resetting in accordance with some aspects. Fig. 9 In the example shown in FIG. 1 , a user equipment (UE) 902 communicates wirelessly with a base station 904 via one or more wireless communication links. Each of the UE 902 and the base station 904 may correspond to a Figure 1-4 , any of the entities shown in 7 and 8, g B node, UE, etc.

[0142] At 906, the UE 902 may receive a list of multiple component carriers from the base station 904. For example, the UE 902 may receive a list of multiple component carriers from the base station 904 and identify the multiple component carriers from the list. In some aspects, during carrier aggregation (CA), the base station 904 may provide one or more component carrier (CC) list sets to the UE 902 using, for example, radio resource control (RRC) signaling. When there are multiple lists, the lists may not overlap. For example, the base station 904 may transmit a first CC list indicating component carriers 1-7 (e.g., CC1-CC7) and a second CC list indicating component carriers 8-15 (e.g., CC8-CC15).

[0143] In some aspects, when a group CC-based beam update procedure is implemented and a TCI state identification (ID) set for a given PDSCH is activated by a MAC-CE for a CC / BWP set (at least for the same frequency band), the same TCI state ID set may be applied to all BWPs in the CC and also to all CCs in the CC list including the CC, if the applicable CC list is indicated by RRC signaling. Thus, if a CC is included in a CC list indicated by RRC signaling from the base station 904 to the UE 902, the TCI state set may be applied to all CCs in the CC list, as well as all BWPs in all those CCs. Thus, the base station 904 may not be required to provide a separate MAC-CE to activate a certain TCI state in all BWPs or CCs.

[0144] In some aspects, for the purpose of simultaneous TCI state activation across multiple CC / BWPs, up to two CC lists may be configured per UE 902 via RRC. The UE 902 may determine which list to apply the TCI state activation to via the CC indicated in the MAC-CE. The UE 902 may desire no overlapping CCs in multiple RRC configured CC lists. When spatial relationship information is activated for periodic / aperiodic (SP / AP) sounding reference signal (SRS) resources by a MAC-CE for at least a set of CC / BWPs for the same frequency band, the spatial relationship information may be applied to the SP / AP SRS resources with the same SRS resource ID for all BWPs in the indicated CCs, if the applicable CC list is indicated by RRC signaling.

[0145] In some aspects, for the purpose of simultaneous spatial relation updates across multiple CCs / BWPs, up to two CC lists may be configured per UE 902 via RRC. The UE 902 may determine which list to apply the spatial relation update to via the CC indicated in the MAC-CE. The UE 902 may not receive overlapping CCs in multiple RRC configured CC lists. These lists may be independent of those used for simultaneous TCI state activation.

[0146] In some aspects, the list may be used for group CC-based beam updates on the downlink. For example, after receiving the BFR response, the UE 902 may be used for downlink control channel (PDCCH) transmissions using a beam reset procedure. However, if the applicable CC list is used for group CC-based beam updates in the DL (e.g., the same set of activated TCI state IDs will be applied to all CCs in the group), the one or more reset beams may be applied to all DL signals and channels, including, for example, all CORESETs, PDSCHs, CSI-RSs, etc. In some aspects, the list may be used for group CC-based beam updates on the uplink. For example, if the applicable CC list is used for group CC-based beam updates in the UL (e.g., the same spatial relationship information is applied to the same SRS resource ID on all CCs in the group), the one or more reset beams may be applied to all UL signals and channels, including SRS, PUCCH, PUSCH, etc.

[0147] At 908, the UE 902 may detect a beam failure on a first component carrier of the multiple component carriers. In some aspects, the UE 902 may deem a beam failure instance to have occurred when the measured quality of the downlink reference signal drops below a given threshold (e.g., a predetermined threshold). In some aspects, the UE 902 may utilize a measurement of a reference signal received power (RSRP) corresponding to a received CSI-RS or SSB. Once the UE 902 detects a given number (e.g., a predetermined number) of consecutive such beam failure instances, the UE 902 may then declare a beam failure. Examples of beam failure detection and recovery procedures may be defined in 3GPP TS 38.321 Section 5.17, Release 15 and Release 16. Upon detecting a beam failure, the UE 902 may initiate a beam failure recovery (BFR) procedure.

[0148] At 910, the UE 902 may transmit a beam failure recovery (BFR) request. In some aspects, the UE 902 may transmit a BFR request in response to detecting a beam failure. For example, upon detecting a beam failure, the UE 902 may search for candidate beams for which connectivity is to be restored. The UE 902 may measure the quality (e.g., RSRP) of one or more reference signals on a given set of candidate beams received from the base station 904. If the measured quality is greater than a threshold (e.g., a predetermined threshold), the beam may be designated as a candidate beam and may be used to restore connectivity. Once the UE 902 identifies the candidate beam, the UE 902 may trigger the transmission of a beam failure recovery request to notify the base station 904 that the UE 902 has detected a beam failure. In some aspects, the beam failure recovery request may include information identifying a candidate beam found by the UE 902 during the candidate beam search. In some aspects, the UE 902 may utilize a random access procedure to transmit the beam failure recovery request to the base station 904. For example, the UE 902 may implement a random access procedure by transmitting a random access preamble and a payload (msgA) to the base station 904. If the base station 904 detects the random access preamble and decodes the payload, the base station 904 may transmit a RAR or a message B (msgB) to the UE 902.

[0149] In some aspects, the payload of the random access message (msgA) transmitted by the UE 902 may include information identifying the candidate beams. In some examples, each candidate beam may be associated with a specific random access preamble configuration. Thus, the base station 904 may receive an indication of the candidate beams identified by the UE 902 based on detecting the specific random access preamble configuration associated with the candidate beam. In some examples, the payload of the random access message transmitted by the UE 902 may be a media access control (MAC) control element (MAC-CE) (e.g., step 2 MAC-CE). In some aspects, the MAC-CE may refer to a series of steps in a beam failure recovery procedure implemented by the UE 902.

[0150] At 912, the base station 904 may transmit a beam failure recovery response. In some aspects, the base station 904 may transmit a beam failure recovery response indicating whether a beam failure recovery request is received. For example, after a predetermined number of symbols after the UE 902 receives a BFR response (e.g., a secondary cell (SCell) BFR response) to step 2 MAC-CE, the beams of all CORESETs in the failed SCell may be reset to the new beams (e.g., candidate beams) reported in step 2 MAC-CE or applied to the new beams. Therefore, in each cell (e.g., SCell), if there is a beam failure, the UE 902 may transmit an indication of the candidate beams to the base station 904 via a BFR message (step 2 MAC-CE), and the base station 904 may transmit a BFR response. After receiving the BFR response, the UE 902 may wait for a predetermined number of symbols. After waiting a predetermined number of symbols after receiving the BFR response, the UE 902 may reset or apply the identified candidate beams (e.g., downlink beams) communicated to the base station 904 for all CORESETs in the failed cell (e.g., SCell). In some aspects, the term "resetting" may include applying a candidate beam to at least one component carrier.

[0151] At 914, the UE 902 may apply the candidate beam to all downlink channels for all component carriers in the list of the multiple component carriers. For example, the list of the multiple component carriers may be used for group CC (group component carrier) based beam update on the downlink. In response to receiving the list of multiple component carriers from the base station 904, the UE 902 may determine that the list of multiple component carriers is used for group CC (group component carrier) based beam update on the downlink and apply the candidate beam to all downlink channels in the list of multiple component carriers. At 916, the UE 902 may apply the candidate beam to all uplink channels for all component carriers in the list of the multiple component carriers. For example, the list of the multiple component carriers may be used for group CC (group component carrier) based beam update on the uplink. In response to receiving the list of multiple component carriers from base station 904, UE 902 may determine the list of multiple component carriers for group CC (group component carrier) based beam update on uplink and apply the candidate beam to all uplink channels in the list of multiple component carriers.

[0152] In some examples, at least for PDCCH, after a predetermined number of symbols after receiving the BFR response to step 2 MAC-CE, if a new beam is identified, then at least for DL ​​reception on the failed cell (e.g., SCell), UE 902 may apply the new beam indicated in step 2 MAC-CE. This may be applied to all CORESETs in the failed cell.

[0153] In some aspects, after a predetermined number of symbols after receiving the BFR response from the base station 904, the UE 902 may apply the new beam indicated in step 2 MAC-CE to at least DL reception on the failed cell (e.g., SCell). In some aspects, this procedure may be extended when a group CC-based beam update procedure is used. For example, after a predetermined number of symbols after receiving the SCell BFR response to the step 2 MAC-CE indicating the failed CC with the identified new beam, if the base station 904 has indicated an applicable CC list including the reported failed CC, the UE 902 may apply the new beam identified in step 2 MAC-CE to each CC in the applicable CC list. Thus, when the UE 902 reports a beam failure corresponding to a given CC corresponding to the SCell, the base station 904 may respond with a new beam for the particular SCell. If such a CC list is configured, the UE 902 may apply the new beam to the entire list of CCs in the same CC list.

[0154] As described herein, after receiving the BFR response, the UE 902 may use a beam resetting procedure for downlink control channel (PDCCH) transmissions. However, if the applicable CC list is used for group CC-based beam updating in the DL (e.g., the same set of activated TCI state IDs will be applied to all CCs in the group), the one or more resetting beams may be applied to all DL signals and channels, including, for example, all CORESETs, PDSCHs, CSI-RSs, etc. If the applicable CC list is used for group CC-based beam updating in the UL (e.g., the same spatial relationship information is applied to the same SRS resource ID on all CCs in the group), the one or more resetting beams may be applied to all UL signals and channels, including SRS, PUCCH, PUSCH, etc.

[0155] At 918, the UE 902 may receive an application indication from the base station 904 indicating whether the UE 902 is to apply the candidate beam to each of the plurality of component carriers or to apply the candidate beam only to the first component carrier of the plurality of component carriers. For example, the base station 904 may transmit an application indication indicating whether the UE 902 is to apply the candidate beam to each of the plurality of component carriers or to apply the candidate beam only to the first component carrier of the plurality of component carriers. When the application indication indicates that the UE 902 is to apply the candidate beam to each of the plurality of component carriers, the UE 902 may receive the application indication from the base station 904 and apply the candidate beam to each of the plurality of component carriers included in the list. In some aspects, the base station 904 may transmit the application indication to the UE 902 using at least one of a radio resource control (RRC) message, a MAC CE, or downlink control information (DCI).

[0156] At 920, the UE 902 may apply the candidate beam to each of the plurality of component carriers based on the application indication. For example, the base station 904 may transmit an application indication indicating whether the UE 902 is to apply the candidate beam to each of the plurality of component carriers or to only apply the candidate beam to a first component carrier of the plurality of component carriers. When the application indication indicates that the UE 902 is to apply the candidate beam to each of the plurality of component carriers, the UE 902 may receive the application indication from the base station 904 and apply the candidate beam to each of the plurality of component carriers included in the list. In some aspects, the base station 904 may transmit the application indication to the UE 902 using at least one of a radio resource control (RRC) message, a MAC CE, or downlink control information (DCI). In some aspects, the UE 902 applying the candidate beam to each of the plurality of component carriers may include the UE 902 applying the candidate beam to each of the plurality of component carriers after a predetermined number of symbols after receiving a beam failure recovery response.

[0157] At 922, the UE 902 may apply the candidate beam only to the first component carrier of the multiple component carriers included in the list. For example, the base station 904 may transmit an application indication indicating whether the UE 902 is to apply the candidate beam to each of the multiple component carriers or to apply the candidate beam only to the first component carrier of the multiple component carriers. When the application indication indicates that the UE 902 is to apply the candidate beam only to the first component carrier of the multiple component carriers, the UE 902 may receive the application indication from the base station 904 and apply the candidate beam only to the first component carrier of the multiple component carriers included in the list. In some aspects, the base station 904 may transmit the application indication to the UE 902 using at least one of a radio resource control (RRC) message, a MAC CE, or downlink control information (DCI). In some aspects, the UE 902 applying the candidate beam only to the first component carrier of the multiple component carriers may include the UE 902 applying the candidate beam only to the first component carrier of the multiple component carriers after a predetermined number of symbols after receiving the beam failure recovery response.

[0158] Fig.10 1014 is a block diagram illustrating an example of a hardware implementation for a user equipment (UE) 1000 that employs a processing system 1014. For example, the UE 1000 may be a Figure 1-4 and any one of the user equipment (UE) or base stations (e.g., gNB or eNB) described in any one or more of 7-9.

[0159] UE 1000 may be implemented with a processing system 1014 including one or more processors 1004. Examples of processor 1004 include microprocessors, microcontrollers, digital signal processors (DSPs), field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform various functionalities described throughout this disclosure. In various examples, UE 1000 may be configured to perform any one or more of the functions described herein. That is, the processor 1004 as utilized in UE 1000 may be used to implement any one or more of the processes described herein. In some instances, processor 1004 may be implemented via a baseband or modem chip, while in other implementations, processor 1004 itself may include several devices that are distinct and different from the baseband or modem chip (e.g., in such scenarios, may work together to achieve aspects discussed herein). And as mentioned above, various hardware arrangements and components outside of the baseband modem processor may be used in implementations, including RF chains, power amplifiers, modulators, buffers, interleavers, adders / summers, etc.

[0160] In this example, the processing system 1014 may be implemented with a bus architecture generally represented by bus 1002. Depending on the specific application and overall design constraints of the processing system 1014, the bus 1002 may include any number of interconnecting buses and bridges. The bus 1002 communicatively couples various circuits including one or more processors (generally represented by processor 1004) and computer-readable media (generally represented by computer-readable storage media 1006). The bus 1002 may also link various other circuits, such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further. The bus interface 1008 provides an interface between the bus 1002 and the transceiver 1010. The transceiver 1010 provides a means for communicating with various other devices over a transmission medium (e.g., an air interface). A user interface 1012 (e.g., a keypad, a display, a speaker, a microphone, a joystick) may also be provided.

[0161] The processor 1004 is responsible for managing the bus 1002 and general processing, including the execution of software stored on the computer-readable storage medium 1006. The software, when executed by the processor 1004, causes the processing system 1014 to perform the various functions described herein for any particular device. The computer-readable storage medium 1006 may also be used to store data that is manipulated by the processor 1004 when executing the software.

[0162] One or more processors 1004 in the processing system can execute software. Software should be broadly interpreted to mean instructions, instruction sets, codes, code segments, program codes, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether described in software, firmware, middleware, microcode, hardware description language, or other terms. The software can reside on a computer-readable storage medium 1006.

[0163] Computer-readable storage medium 1006 may be a non-transient computer-readable medium. As an example, non-transient computer-readable media include magnetic storage devices (e.g., hard disks, floppy disks, magnetic tapes), optical disks (e.g., compact disks (CDs) or digital versatile disks (DVDs)), smart cards, flash memory devices (e.g., card, stick, or key-type drives), random access memory (RAM), read-only memory (ROM), programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), registers, removable disks, and any other suitable medium for storing software and / or instructions that can be accessed and read by a computer. Computer-readable storage medium 1006 may reside in processing system 1014, be external to processing system 1014, or be distributed across multiple entities including processing system 1014. Computer-readable storage medium 1006 may be implemented in a computer program product. As an example, a computer program product may include a computer-readable medium in packaging materials. Those skilled in the art will recognize how to best implement the described functionality presented throughout this disclosure depending on the particular application and the overall design constraints imposed on the overall system.

[0164] In some aspects of the present disclosure, the processor 1004 may include a circuit system configured for various functions. For example, the processor 1004 may include an identification circuit system 1040 configured to identify a list of multiple component carriers (CCs). The identification circuit system 1040 may be configured to execute identification instructions 1050 stored in the computer-readable storage medium 1006 to implement any one of one or more of the functions described herein. The processor 1004 may also include a detection circuit system 1042 configured to detect a beam failure on a first component carrier in the multiple component carriers. The detection circuit system 1042 may be configured to execute a detection instruction 1052 stored in the computer-readable storage medium 1006 to implement any one of one or more of the functions described herein.

[0165] The processor 1004 may further include a transmitting circuit system 1044 configured to transmit a beam failure recovery request to a base station, the beam failure recovery request including a candidate beam indication for a candidate beam. The transmitting circuit system 1044 may be configured to execute a transmitting instruction 1054 stored in a computer-readable storage medium 1006 to implement any one or more of the functions described herein. In addition, the processor 1004 may include a receiving circuit system 1046 configured to receive a beam failure recovery response from the base station. The receiving circuit system 1046 may also be configured to receive a list of the multiple component carriers from the base station. The receiving circuit system 1046 may further be configured to receive an application indication indicating whether to apply the candidate beam to each of the multiple component carriers or to only apply the candidate beam to the first component carrier of the multiple component carriers. The receiving circuit system 1046 may be configured to execute a receiving instruction 1056 stored in a computer-readable storage medium 1006 to implement any one or more of the functions described herein.

[0166] In addition, the processor 1004 may include an application circuit system 1048 configured to apply the candidate beam to at least one of the multiple component carriers. The application circuit system 1048 may also be configured to apply the candidate beam for all downlink channels in the list when the list of the multiple component carriers is used for group CC-based beam updates on the downlink. The application circuit system 1048 may be further configured to apply the candidate beam for all uplink channels in the list when the list of the multiple component carriers is used for group CC-based beam updates on the uplink. In addition, the application circuit system 1048 may be configured to apply the candidate beam to each of the multiple component carriers. The application circuit system 1048 may be configured to apply the candidate beam only to the first component carrier of the multiple component carriers. The application circuit system 1048 may also be configured to apply the candidate beam to the at least one of the multiple component carriers after a predetermined number of symbols after receiving the beam failure recovery response. Application circuitry 1048 may be configured to execute application instructions 1058 stored in computer-readable storage medium 1006 to implement any of one or more of the functionalities described herein.

[0167] Fig.11 1100 is a flow chart of a method for beam resetting according to some aspects. As described below, some or all of the illustrated features may be omitted in certain implementations within the scope of the present disclosure, and some of the illustrated features may not be required to implement all aspects. In some examples, the method may be as described above and in Fig.10The UE 1000 illustrated in the figure is executed by a processor or a processing system, or by any suitable means for performing the described functions.

[0168] At block 1102, the UE 1000 may identify a list of multiple component carriers (CCs). For example, the UE may receive a list of multiple component carriers from a base station and identify the multiple component carriers from the list. In some aspects, during carrier aggregation (CA), the base station may provide one or more sets of component carrier (CC) lists to the UE using, for example, radio resource control (RRC) signaling. When there are multiple lists, the lists may not overlap. For example, the base station may transmit a first CC list indicating component carriers 1-7 (e.g., CC1-CC7) and a second CC list indicating component carriers 8-15 (e.g., CC8-CC15).

[0169] In some aspects, when a group CC-based beam update procedure is implemented and a TCI state identification (ID) set for a given PDSCH is activated by a MAC-CE for a CC / BWP set (at least for the same frequency band), the same TCI state ID set may be applied to all BWPs in the CC and also to all CCs in the CC list including the CC, if the applicable CC list is indicated by RRC signaling. Thus, if a CC is included in a CC list indicated by RRC signaling from a base station to a UE, the TCI state set may be applied to all CCs in the CC list, as well as all BWPs in all those CCs. Thus, the base station may not be required to provide a separate MAC-CE to activate a certain TCI state in all BWPs or CCs.

[0170] In some aspects, up to two CC lists may be configured per UE via RRC for the purpose of simultaneous TCI state activation across multiple CCs / BWPs. The UE may determine which list to apply the TCI state activation to via the CC indicated in the MAC-CE. The UE may expect that there are no overlapping CCs in multiple RRC configured CC lists. When spatial relationship information is activated for periodic / aperiodic (SP / AP) sounding reference signal (SRS) resources by a MAC-CE for at least a set of CCs / BWPs for the same frequency band, the spatial relationship information may be applied to the SP / AP SRS resources with the same SRS resource ID for all BWPs in the indicated CCs, if the applicable CC list is indicated by RRC signaling.

[0171] In some aspects, up to two CC lists may be configured per UE via RRC for the purpose of simultaneous spatial relation updates across multiple CCs / BWPs. The UE may determine which list to apply the spatial relation update to via the CC indicated in the MAC-CE. In some examples, the UE may not receive overlapping CCs in multiple RRC configured CC lists. These lists may be independent of those used for simultaneous TCI state activation.

[0172] In some aspects, the list may be used for group CC-based beam updates on the downlink. For example, after receiving the BFR response, the UE may use the beam reset procedure for downlink control channel (PDCCH) transmissions. However, if the applicable CC list is used for group CC-based beam updates in the DL (e.g., the same set of activated TCI state IDs will be applied to all CCs in the group), the one or more reset beams may be applied to all DL signals and channels, including, for example, all CORESETs, PDSCHs, CSI-RSs, etc. In some aspects, the list may be used for group CC-based beam updates on the uplink. For example, if the applicable CC list is used for group CC-based beam updates in the UL (e.g., the same spatial relationship information is applied to the same SRS resource ID on all CCs in the group), the one or more reset beams may be applied to all UL signals and channels, including SRS, PUCCH, PUSCH, etc. In combination with the above Fig.10 The identification circuitry 1040 shown and described may provide means for identifying a list of a plurality of component carriers.

[0173] At block 1104, UE 1000 may detect a beam failure on a first component carrier among the multiple component carriers. In some aspects, the UE may deem a beam failure instance to have occurred when the measured quality of the downlink reference signal drops below a given threshold (e.g., a predetermined threshold). In some aspects, the UE may utilize a measurement of a reference signal received power (RSRP) corresponding to a received CSI-RS or SSB. Once the UE detects a given number (e.g., a predetermined number) of consecutive such beam failure instances, the UE may then declare a beam failure. Examples of beam failure detection and recovery procedures may be defined in 3GPP TS 38.321 Section 5.17, Release 15 and Release 16. Upon detection of a beam failure, the UE may initiate a beam failure recovery (BFR) procedure. In conjunction with the above, Fig.10 The detection circuitry 1042 shown and described may provide means for detecting a beam failure on a first component carrier of the plurality of component carriers.

[0174] In block 1106, the UE may transmit a beam failure recovery request to the base station, the beam failure recovery request including a candidate beam indication for the candidate beam. In some aspects, the UE may transmit a BFR request in response to detecting a beam failure. For example, upon detecting a beam failure, the UE may search for a candidate beam to restore connectivity. The UE may measure the quality (e.g., RSRP) of one or more reference signals on a given set of candidate beams received from the base station. If the measured quality is greater than a threshold (e.g., a predetermined threshold), the beam may be designated as a candidate beam and may be used to restore connectivity. Once the UE identifies the candidate beam, the UE may trigger the transmission of a beam failure recovery request to notify the base station that the UE has detected a beam failure. In some aspects, the beam failure recovery request may include information identifying a candidate beam found by the UE during the candidate beam search. In some aspects, the UE may utilize a random access procedure to transmit the beam failure recovery request to the base station. For example, the UE may implement the random access procedure by transmitting a random access preamble and a payload (msgA) to the base station. If the base station detects the random access preamble and decodes the payload, the base station may transmit a RAR or a message B (msgB) to the UE.

[0175] In some aspects, the payload of the random access message (msgA) transmitted by the UE may include information identifying the candidate beams. In some examples, each candidate beam may be associated with a specific random access preamble configuration. Thus, the base station may receive an indication of the candidate beams identified by the UE based on detecting the specific random access preamble configuration associated with the candidate beam. In some examples, the payload of the random access message transmitted by the UE may be a media access control (MAC) control element (MAC-CE) (e.g., step 2 MAC-CE). In some aspects, MAC-CE may refer to a series of steps in a beam failure recovery (BFR) procedure implemented by the UE. In addition, the random access response transmitted by the base station may be referred to as a BFR response. In conjunction with the above Fig.10 The transmit circuitry 1044 in conjunction with the transceiver 1010 shown and described may provide means for transmitting a beam failure recovery request including a candidate beam indication of a candidate beam to a base station.

[0176] At block 1108, the UE 1000 may receive a beam failure recovery response from the base station. In some aspects, the base station may transmit a beam failure recovery response indicating whether a beam failure recovery request has been received. For example, after a predetermined number of symbols after the UE receives a BFR response (e.g., a secondary cell (SCell) BFR response) to step 2 MAC-CE, the beams of all CORESETs in the failed SCell may be reset to or applied to the new beams (e.g., candidate beams) reported in step 2 MAC-CE. Thus, in each cell (e.g., SCell), if there is a beam failure, the UE may transmit an indication of the candidate beams to the base station via a BFR message (step 2 MAC-CE), and the base station may transmit a BFR response. After receiving the BFR response, the UE may wait for a predetermined number of symbols. After waiting for a predetermined number of symbols after receiving the BFR response, the UE may reset or apply the identified candidate beams (e.g., downlink beams) communicated to the base station for all CORESETs in the failed cell (e.g., SCell). In some aspects, the term "resetting" may include applying a candidate beam to at least one component carrier. Fig.10 The receive circuitry 1046 in conjunction with the transceiver 1010 shown and described may provide a means for receiving a beam failure recovery response from the base station.

[0177] At block 1110, the UE 1000 may apply the candidate beam to at least one of the plurality of component carriers. For example, for 5G NR, at least for PDCCH, after receiving a predetermined number of symbols of the BFR response to the step 2 MAC-CE, if a new beam is identified, then at least for DL ​​reception on the failed cell (e.g., SCell), the UE may apply the new beam indicated in the step 2 MAC-CE. This may be applied to all CORESETs in the failed cell.

[0178] In conjunction with this beam resetting rule, group CC based beam update may be used after receiving the step 2 MAC-CE response. For example, if the UE receives a TCI state activation / deactivation of a UE-specific physical downlink shared channel (PDSCH) MAC-CE identifying a given CC, the UE may apply the same TCI state set to all CCs in the same CC list as the identified CC.

[0179] In some aspects, after a predetermined number of symbols after receiving the BFR response from the base station, the UE may apply the new beam indicated in step 2 MAC-CE to at least DL reception on the failed cell (e.g., SCell). In some aspects, this procedure may be extended when a group CC-based beam update procedure is used. For example, after a predetermined number of symbols after receiving the SCell BFR response to step 2 MAC-CE indicating the failed CC with the identified new beam, if the base station has indicated an applicable CC list including the reported failed CC, the UE may apply the new beam identified in step 2 MAC-CE to each CC in the applicable CC list. Thus, when the UE reports a beam failure corresponding to a given CC corresponding to an SCell, the base station may respond with a new beam for that particular SCell. If such a CC list is configured, the UE may apply the new beam to the entire list of CCs in the same CC list.

[0180] As described herein, after receiving the BFR response, the UE may use the beam resetting procedure for downlink control channel (PDCCH) transmissions. However, if the applicable CC list is used for group CC-based beam updating in DL (e.g., the same set of activated TCI state IDs will be applied to all CCs in the group), the one or more reset beams may be applied to all DL signals and channels, including, for example, all CORESETs, PDSCHs, CSI-RSs, etc. If the applicable CC list is used for group CC-based beam updating in UL (e.g., the same spatial relationship information is applied to the same SRS resource ID on all CCs in the group), the one or more reset beams may be applied to all UL signals and channels, including SRS, PUCCH, PUSCH, etc.

[0181] In some examples, the base station may indicate whether the one or more reset beams are applied to each CC in the CC list or only to the faulty CC. For example, the base station may provide an information element to the UE using any suitable control message (e.g., radio resource control (RRC), MAC-CE, downlink control information (DCI), etc.), which indicates how the UE is to apply the one or more reset beams, whether to apply to each CC in the CC list or only to the faulty CC.

[0182] In some aspects, the UE may apply the candidate beam to each of the multiple component carriers included in the list. For example, the base station may transmit an application indication indicating whether the UE is to apply the candidate beam to each of the multiple component carriers or to only apply the candidate beam to the first component carrier of the multiple component carriers. When the application indication indicates that the UE is to apply the candidate beam to each of the multiple component carriers, the UE may receive the application indication from the base station and apply the candidate beam to each of the multiple component carriers included in the list. In some aspects, the base station may transmit the application indication to the UE using at least one of a radio resource control (RRC) message, a MAC CE, or downlink control information (DCI).

[0183] In some aspects, the UE may apply the candidate beam only to the first component carrier of the multiple component carriers included in the list. For example, the base station may transmit an application indication indicating whether the UE is to apply the candidate beam to each component carrier of the multiple component carriers or to apply the candidate beam only to the first component carrier of the multiple component carriers. When the application indication indicates that the UE is to apply the candidate beam only to the first component carrier of the multiple component carriers, the UE may receive the application indication from the base station and apply the candidate beam only to the first component carrier of the multiple component carriers included in the list. In some aspects, the base station may transmit the application indication to the UE using at least one of a radio resource control (RRC) message, a MAC CE, or downlink control information (DCI). In combination with the above Fig.10 The illustrated and described application circuitry 1048 may provide means for applying the candidate beam to at least one component carrier of the plurality of component carriers.

[0184] Fig.12 1200 is a flow chart of a method for beam resetting according to some aspects. As described below, some or all of the illustrated features may be omitted in certain implementations within the scope of the present disclosure, and some of the illustrated features may not be required to implement all aspects. In some examples, the method may be as described above and in Fig.10 The UE 1000 illustrated in the figure is executed by a processor or a processing system, or by any suitable means for performing the described functions.

[0185] At block 1202, UE 1000 may receive a list of multiple component carriers (CCs) from a base station. For example, the UE may receive a list of multiple component carriers from a base station and identify the multiple component carriers from the list. In some aspects, during carrier aggregation (CA), the base station may provide one or more component carrier (CC) list sets to the UE using, for example, radio resource control (RRC) signaling. When there are multiple lists, the lists may not overlap. For example, the base station may transmit a first CC list indicating component carriers 1-7 (e.g., CC1-CC7) and a second CC list indicating component carriers 8-15 (e.g., CC8-CC15).

[0186] In some aspects, when a group CC-based beam update procedure is implemented and a TCI state identification (ID) set for a given PDSCH is activated by a MAC-CE for a CC / BWP set (at least for the same frequency band), the same TCI state ID set may be applied to all BWPs in the CC and also to all CCs in the CC list including the CC, if the applicable CC list is indicated by RRC signaling. Thus, if a CC is included in a CC list indicated by RRC signaling from a base station to a UE, the TCI state set may be applied to all CCs in the CC list, as well as all BWPs in all those CCs. Thus, the base station may not be required to provide a separate MAC-CE to activate a certain TCI state in all BWPs or CCs.

[0187] In some aspects, up to two CC lists may be configured per UE via RRC for the purpose of simultaneous TCI state activation across multiple CCs / BWPs. The UE may determine which list to apply the TCI state activation to via the CC indicated in the MAC-CE. The UE may expect that there are no overlapping CCs in multiple RRC configured CC lists. When spatial relationship information is activated for periodic / aperiodic (SP / AP) sounding reference signal (SRS) resources by a MAC-CE for at least a set of CCs / BWPs for the same frequency band, the spatial relationship information may be applied to the SP / AP SRS resources with the same SRS resource ID for all BWPs in the indicated CCs, if the applicable CC list is indicated by RRC signaling.

[0188] In some aspects, for the purpose of simultaneous spatial relation updates across multiple CCs / BWPs, up to two CC lists may be configured per UE via RRC. The UE may determine which list to apply the spatial relation update to via the CC indicated in the MAC-CE. The UE may not receive overlapping CCs in multiple RRC configured CC lists. These lists may be independent of those used for simultaneous TCI state activation.

[0189] In some aspects, the list may be used for group CC based beam update on the downlink. For example, after receiving the BFR response, the UE may be used for downlink control channel (PDCCH) transmission using the beam reset procedure. However, if the applicable CC list is used for group CC based beam update in the DL (e.g., the same set of activated TCI state IDs will be applied to all CCs in the group), the one or more reset beams may be applied to all DL signals and channels, including, for example, all CORESETs, PDSCHs, CSI-RSs, etc. In some aspects, the list may be used for group CC based beam update on the uplink. For example, if the applicable CC list is used for group CC based beam update in the UL (e.g., the same spatial relationship information is applied to the same SRS resource ID on all CCs in the group), the one or more reset beams may be applied to all UL signals and channels, including SRS, PUCCH, PUSCH, etc. In combination with the above Fig.10 The receive circuitry 1046 shown and described in conjunction with the transceiver 1010 may provide means for receiving a list of a plurality of component carriers (CCs) from a base station.

[0190] At block 1204, the UE 1000 may detect a beam failure on a first component carrier of the multiple component carriers. For example, the beam failure may correspond to a condition where the beam quality drops to an unacceptably low level. In some aspects, the UE may deem a beam failure instance to have occurred when the measured quality of a downlink reference signal drops below a given threshold (e.g., a predetermined threshold). In some aspects, the UE may utilize a measurement of a reference signal received power (RSRP) corresponding to a received CSI-RS or SSB. Once the UE detects a given number (e.g., a predetermined number) of consecutive such beam failure instances, the UE may then declare a beam failure. Examples of beam failure detection and recovery procedures may be defined in 3GPP TS 38.321 Section 5.17, Release 15 and Release 16. Upon detection of a beam failure, the UE may initiate a beam failure recovery (BFR) procedure. In conjunction with the above Fig.10 The detection circuitry 1042 shown and described may provide means for detecting a beam failure on a first component carrier of the plurality of component carriers.

[0191] In block 1206, the UE 1000 may transmit a beam failure recovery request to the base station, the beam failure recovery request including a candidate beam indication for the candidate beam. In some aspects, the UE may transmit a BFR request in response to detecting a beam failure. For example, upon detecting a beam failure, the UE may search for a candidate beam to restore connectivity. The UE may measure the quality (e.g., RSRP) of one or more reference signals on a given set of candidate beams received from the base station. If the measured quality is greater than a threshold (e.g., a predetermined threshold), the beam may be designated as a candidate beam and may be used to restore connectivity. Once the UE identifies the candidate beam, the UE may trigger the transmission of a beam failure recovery request to notify the base station that the UE has detected a beam failure. In some aspects, the beam failure recovery request may include information identifying a candidate beam found by the UE during the candidate beam search. In some aspects, the UE may utilize a random access procedure to transmit the beam failure recovery request to the base station. For example, the UE may implement the random access procedure by transmitting a random access preamble and a payload (msgA) to the base station. If the base station detects the random access preamble and decodes the payload, the base station may transmit a RAR or a message B (msgB) to the UE.

[0192] In some aspects, the payload of the random access message (msgA) transmitted by the UE may include information identifying the candidate beams. In some examples, each candidate beam may be associated with a specific random access preamble configuration. Thus, the base station may receive an indication of the candidate beams identified by the UE based on detecting the specific random access preamble configuration associated with the candidate beam. In some examples, the payload of the random access message transmitted by the UE may be a media access control (MAC) control element (MAC-CE) (e.g., step 2 MAC-CE). In some aspects, MAC-CE may refer to a series of steps in a beam failure recovery procedure implemented by the UE. In conjunction with the above Fig.10 The transmit circuitry 1044 in conjunction with the transceiver 1010 shown and described may provide means for transmitting a beam failure recovery request in response to detecting a beam failure.

[0193] At block 1208, the UE 1000 may receive a beam failure recovery response from the base station. In some aspects, the base station may transmit a beam failure recovery response indicating whether a beam failure recovery request is received. For example, after a predetermined number of symbols after the UE receives a BFR response (e.g., a secondary cell (SCell) BFR response) to step 2 MAC-CE, the beams of all CORESETs in the failed SCell may be reset to or applied to the new beams (e.g., candidate beams) reported in step 2 MAC-CE. Thus, in each cell (e.g., SCell), if there is a beam failure, the UE may transmit an indication of the candidate beams to the base station via a BFR message (step 2 MAC-CE), and the base station may transmit a BFR response. After receiving the BFR response, the UE may wait for a predetermined number of symbols. After waiting for a predetermined number of symbols after receiving the BFR response, the UE may reset or apply the identified candidate beams (e.g., downlink beams) communicated to the base station for all CORESETs in the failed cell (e.g., SCell). In some aspects, the term "resetting" may include applying a candidate beam to at least one component carrier. Fig.10 The receive circuitry 1046 in conjunction with the transceiver 1010 shown and described may provide a means for receiving a beam failure recovery response from the base station.

[0194] In block 1210, the UE 1000 may apply the candidate beam to all downlink channels of all component carriers in the list of the multiple component carriers, and in block 1212, the UE 1000 may apply the candidate beam to all uplink channels of all component carriers in the list of the multiple component carriers. For example, the list of the multiple component carriers may be used for group CC (group component carrier) based beam update on the downlink. In response to receiving the list of the multiple component carriers from the base station, the UE may determine that the list of the multiple component carriers is used for group CC (group component carrier) based beam update on the downlink and apply the candidate beam to all downlink channels in the list of the multiple component carriers. The UE may apply the candidate beam to all uplink channels in the list of the multiple component carriers. For example, the list of the multiple component carriers may be used for group CC (group component carrier) based beam update on the uplink. In response to receiving the list of multiple component carriers from the base station, the UE may determine the list of multiple component carriers for group CC (group component carrier) based beam update on uplink and apply candidate beams to all uplink channels in the list of multiple component carriers.

[0195] In some examples, at least for PDCCH, after a predetermined number of symbols after receiving the BFR response to step 2 MAC-CE, if a new beam is identified, then at least for DL ​​reception on the failed cell (e.g., SCell), the UE may apply the new beam indicated in step 2 MAC-CE. This may be applied to all CORESETs in the failed cell.

[0196] In some aspects, after a predetermined number of symbols after receiving the BFR response from the base station, the UE may apply the new beam indicated in step 2 MAC-CE to at least DL reception on the failed cell (e.g., SCell). In some aspects, this procedure may be extended when a group CC-based beam update procedure is used. For example, after a predetermined number of symbols after receiving the SCell BFR response to step 2 MAC-CE indicating the failed CC with the identified new beam, if the base station has indicated an applicable CC list including the reported failed CC, the UE may apply the new beam identified in step 2 MAC-CE to each CC in the applicable CC list. Thus, when the UE reports a beam failure corresponding to a given CC corresponding to an SCell, the base station may respond with a new beam for that particular SCell. If such a CC list is configured, the UE may apply the new beam to the entire list of CCs in the same CC list.

[0197] As described herein, after receiving the BFR response, the UE may use the beam resetting procedure for downlink control channel (PDCCH) transmissions. However, if the applicable CC list is used for group CC-based beam updating in the DL (e.g., the same set of activated TCI state IDs will be applied to all CCs in the group), the one or more reset beams may be applied to all DL signals and channels, including, for example, all CORESETs, PDSCHs, CSI-RSs, etc. If the applicable CC list is used for group CC-based beam updating in the UL (e.g., the same spatial relationship information is applied to the same SRS resource ID on all CCs in the group), the one or more reset beams may be applied to all UL signals and channels, including SRS, PUCCH, PUSCH, etc. In conjunction with the above Fig.10 The application circuit system 1048 shown and described may provide means for applying the candidate beam for all downlink channels in the list if the list of the plurality of component carriers is used for group CC-based beam update on the downlink. Fig.10 The illustrated and described application circuitry 1048 may provide means for applying the candidate beam for all downlink channels in the list if the list of the plurality of component carriers is used for group CC based beam updating on the downlink.

[0198] In box 1214, UE 1000 may receive an application indication, which indicates whether to apply the candidate beam to each component carrier in the multiple component carriers or to apply the candidate beam only to the first component carrier in the multiple component carriers. For example, the base station may transmit an application indication indicating whether the UE is to apply the candidate beam to each component carrier in the multiple component carriers or to apply the candidate beam only to the first component carrier in the multiple component carriers. When the application indication indicates that the UE is to apply the candidate beam to each component carrier in the multiple component carriers, the UE may receive the application indication from the base station and apply the candidate beam to each component carrier in the multiple component carriers included in the list. In some aspects, the base station may transmit the application indication to the UE using at least one of a radio resource control (RRC) message, a MAC CE, or downlink control information (DCI). In combination with the above Fig.10 The receiving circuit system 1046 shown and described in conjunction with the transceiver 1010 may provide a means for receiving an application indication indicating whether the candidate beam is to be applied to each of the multiple component carriers or only to the first component carrier of the multiple component carriers.

[0199] In block 1216, UE 1000 may apply the candidate beam to each of the multiple component carriers. For example, the base station may transmit an application indication indicating whether the UE is to apply the candidate beam to each of the multiple component carriers or to only the first component carrier of the multiple component carriers. When the application indication indicates that the UE is to apply the candidate beam to each of the multiple component carriers, the UE may receive the application indication from the base station and apply the candidate beam to each of the multiple component carriers included in the list. In some aspects, the base station may transmit the application indication to the UE using at least one of a radio resource control (RRC) message, a MAC CE, or downlink control information (DCI). In some aspects, the UE applying the candidate beam to each of the multiple component carriers may include the UE applying the candidate beam to each of the multiple component carriers after a predetermined number of symbols after receiving a beam failure recovery response. In combination with the above Fig.10 The illustrated and described application circuitry 1048 may provide means for applying the candidate beam to each component carrier of the plurality of component carriers.

[0200] In block 1218, UE 1000 may apply the candidate beam only to a first component carrier among the multiple component carriers. For example, the base station may transmit an application indication indicating whether the UE is to apply the candidate beam to each component carrier among the multiple component carriers or to apply the candidate beam only to the first component carrier among the multiple component carriers. When the application indication indicates that the UE is to apply the candidate beam only to the first component carrier among the multiple component carriers, the UE may receive the application indication from the base station and apply the candidate beam only to the first component carrier among the multiple component carriers included in the list. In some aspects, the base station may transmit the application indication to the UE using at least one of a radio resource control (RRC) message, a MAC CE, or downlink control information (DCI). In some aspects, the UE applying the candidate beam only to the first component carrier among the multiple component carriers may include the UE applying the candidate beam only to the first component carrier among the multiple component carriers after a predetermined number of symbols after receiving a beam failure recovery response. In combination with the above Fig.10 The illustrated and described application circuitry 1048 may provide means for applying the candidate beam to only the first component carrier of the plurality of component carriers.

[0201] In one configuration, the UE 1000 includes a Fig.11 and 12 In one aspect, the aforementioned means may be a device for performing the functions and processes described herein. Fig.10 The processor 1004 shown in the figure is configured to perform the functions recited by the aforementioned means. On the other hand, the aforementioned means may be a circuit or any equipment configured to perform the functions recited by the aforementioned means.

[0202] Of course, in the above examples, the circuit system included in the processor 1004 is provided only as an example, and other means for performing the described functions may be included in various aspects of the present disclosure, including but not limited to instructions stored in the computer-readable storage medium 1006, or in Figure 1-4 and any of 7-9 and using, for example, the present invention with respect to Fig.11 and 12 Any other suitable apparatus or device that implements the described processes and / or algorithms.

[0203] Fig.13 is a block diagram illustrating an example of a hardware implementation for a base station 1300 employing a processing system 1314 according to some aspects. For example, the base station 1300 may correspond to Figure 1-4 Any of the devices or systems shown and described in any one or more of and 7-10.

[0204] According to various aspects of the present disclosure, an element, or any portion of an element, or any combination of elements may be implemented using a processing system 1314 including one or more processors 1304. The processing system 1314 may be associated with Fig.10 The processing system 1014 illustrated in FIG. 1 is substantially the same as that in FIG. 1 , including a bus interface 1308, a bus 1302, a processor 1304, and a computer-readable storage medium 1306. In addition, the base station 1300 may include the same as that in FIG. Fig.10 The user interface 1312 and transceiver 1310 are substantially similar to those described in . That is, the processor 1304 as utilized in the base station 1300 may be used to implement any one or more of the processes described herein.

[0205] In some aspects of the present disclosure, the processor 1304 may include a circuit system configured for various functions. For example, the processor 1304 may include a receiving circuit system 1340 configured to receive a beam failure recovery request from a UE, and the beam failure recovery request includes a candidate beam indication, and the candidate beam indication indicates a candidate beam based on the detection of a beam failure of a first component carrier in a plurality of component carriers. The receiving circuit system 1340 may be configured to execute the receiving instructions 1350 stored in the computer-readable storage medium 1306 to implement any one or more of the functions described herein.

[0206] The processor 1304 may also include a transmission circuit system 1342 configured to transmit a beam failure recovery response including an application indication to the UE, the application indication indicating that the UE is to apply the candidate beam to at least one of the multiple component carriers. The transmission circuit system 1342 may also be configured to transmit a list identifying the multiple component carriers (CCs) to the user equipment (UE). The transmission circuit system 1342 may further be configured to transmit an application indication to the UE, the application indication indicating whether the UE is to apply the candidate beam to each of the multiple component carriers or only to the first component carrier of the multiple component carriers. The transmission circuit system 1342 may be configured to execute the transmission instructions 1352 stored in the computer-readable storage medium 1306 to implement any one or more of the functions described herein.

[0207] Fig.14 1400 is a flowchart of a method for beam resetting according to some aspects. As described below, some or all of the illustrated features may be omitted in certain implementations within the scope of the present disclosure, and some of the illustrated features may not be required to implement all aspects. In some examples, the method may be as described above and in Fig.13The base station 1300 illustrated in FIG. 1 is executed by a processor or a processing system, or by any suitable means for performing the described functions.

[0208] In block 1402, the base station 1300 may receive a beam failure recovery request from a UE, and the beam failure recovery request includes a candidate beam indication, which indicates a candidate beam based on the detection of a beam failure of a first component carrier among multiple component carriers. For example, the UE may receive a list of multiple component carriers from the base station and identify the multiple component carriers from the list. In some aspects, during carrier aggregation (CA), the base station may provide one or more component carrier (CC) list sets to the UE using, for example, radio resource control (RRC) signaling. When there are multiple lists, the lists may not overlap. For example, the base station may transmit a first CC list indicating component carriers 1-7 (e.g., CC1-CC7) and a second CC list indicating component carriers 8-15 (e.g., CC8-CC15).

[0209] In some aspects, when a group CC-based beam update procedure is implemented and a TCI state identification (ID) set for a given PDSCH is activated by a MAC-CE for a CC / BWP set (at least for the same frequency band), the same TCI state ID set may be applied to all BWPs in the CC and also to all CCs in the CC list including the CC, if the applicable CC list is indicated by RRC signaling. Thus, if a CC is included in a CC list indicated by RRC signaling from a base station to a UE, the TCI state set may be applied to all CCs in the CC list, as well as all BWPs in all those CCs. Thus, the base station may not be required to provide a separate MAC-CE to activate a certain TCI state in all BWPs or CCs.

[0210] In some aspects, up to two CC lists may be configured per UE via RRC for the purpose of simultaneous TCI state activation across multiple CCs / BWPs. The UE may determine which list to apply the TCI state activation to via the CC indicated in the MAC-CE. The UE may expect that there are no overlapping CCs in multiple RRC configured CC lists. When spatial relationship information is activated for periodic / aperiodic (SP / AP) sounding reference signal (SRS) resources by a MAC-CE for at least a set of CCs / BWPs for the same frequency band, the spatial relationship information may be applied to the SP / AP SRS resources with the same SRS resource ID for all BWPs in the indicated CCs, if the applicable CC list is indicated by RRC signaling.

[0211] In some aspects, for the purpose of simultaneous spatial relation updates across multiple CCs / BWPs, up to two CC lists may be configured per UE via RRC. The UE may determine which list to apply the spatial relation update to via the CC indicated in the MAC-CE. The UE may not receive overlapping CCs in multiple RRC configured CC lists. These lists may be independent of those used for simultaneous TCI state activation.

[0212] In some aspects, the list may be used for group CC-based beam updates on the downlink. For example, after receiving the BFR response, the UE 902 may use a beam resetting procedure for downlink control channel (PDCCH) transmissions. However, if the applicable CC list is used for group CC-based beam updates in the DL (e.g., the same set of activated TCI state IDs will be applied to all CCs in the group), the one or more reset beams may be applied to all DL signals and channels, including, for example, all CORESETs, PDSCHs, CSI-RSs, etc. In some aspects, the list may be used for group CC-based beam updates on the uplink. For example, if the applicable CC list is used for group CC-based beam updates in the UL (e.g., the same spatial relationship information is applied to the same SRS resource ID on all CCs in the group), the one or more reset beams may be applied to all UL signals and channels, including SRS, PUCCH, PUSCH, etc.

[0213] The UE may detect a beam failure on a first component carrier among the multiple component carriers. In some aspects, the UE may deem that a beam failure instance has occurred when the measured quality of the downlink reference signal drops below a given threshold (e.g., a predetermined threshold). In some aspects, the UE may utilize a measurement of a reference signal received power (RSRP) corresponding to a received CSI-RS or SSB. Once the UE detects a given number (e.g., a predetermined number) of consecutive such beam failure instances, the UE may then declare a beam failure. Examples of beam failure detection and recovery procedures may be defined in 3GPP TS 38.321 Section 5.17, Release 15 and Release 16. Once a beam failure is detected, the UE may initiate a beam failure recovery (BFR) procedure.

[0214] The base station may then receive a beam failure recovery (BFR) request from the UE. In some aspects, the base station may receive the BFR request from the UE in response to the UE detecting a beam failure. For example, upon detecting a beam failure, the UE may search for candidate beams for which connectivity is to be restored. The UE may measure the quality (e.g., RSRP) of one or more reference signals on a given set of candidate beams received from the base station. If the measured quality is greater than a threshold (e.g., a predetermined threshold), the beam may be designated as a candidate beam and may be used to restore connectivity. Once the UE identifies the candidate beam, the UE may trigger the transmission of a beam failure recovery request to notify the base station that the UE has detected a beam failure. In some aspects, the beam failure recovery request may include information identifying a candidate beam discovered by the UE during the candidate beam search. In some aspects, the UE may utilize a random access procedure to transmit the beam failure recovery request to the base station. For example, the UE may implement the random access procedure by transmitting a random access preamble and a payload (msgA) to the base station. If the base station detects the random access preamble and decodes the payload, the base station may transmit a RAR or a message B (msgB) to the UE.

[0215] In some aspects, the payload of the random access message (msgA) transmitted by the UE may include information identifying the candidate beams. In some examples, each candidate beam may be associated with a specific random access preamble configuration. Thus, the base station may receive an indication of the candidate beams identified by the UE based on detecting the specific random access preamble configuration associated with the candidate beam. In some examples, the payload of the random access message transmitted by the UE may be a media access control (MAC) control element (MAC-CE) (e.g., step 2 MAC-CE). In some aspects, MAC-CE may refer to a series of steps in a beam failure recovery (BFR) procedure implemented by the UE. In addition, the random access response transmitted by the base station may be referred to as a BFR response. In conjunction with the above Fig.13 The illustrated and described receiving circuit system 1340 in conjunction with the transceiver 1310 may provide a means for receiving a beam failure recovery request from a UE, the beam failure recovery request including a candidate beam indication indicating a candidate beam based on detection of a beam failure of a first component carrier among a plurality of component carriers.

[0216] At block 1404, the base station 1300 may transmit a beam failure recovery response including an application indication to the UE, the application indication indicating that the UE is to apply the candidate beam to at least one of the multiple component carriers. In some aspects, the base station may transmit a beam failure recovery response indicating whether a beam failure recovery request is received. For example, after a predetermined number of symbols after the UE receives a BFR response (e.g., a secondary cell (SCell) BFR response) to step 2 MAC-CE, the beams of all CORESETs in the failed SCell may be reset to the new beam (e.g., candidate beam) reported in step 2 MAC-CE or applied to the new beam. Thus, in each cell (e.g., SCell), if there is a beam failure, the UE may transmit an indication of the candidate beam to the base station via a BFR message (step 2 MAC-CE), and the base station may transmit a BFR response. After receiving the BFR response, the UE may wait for a predetermined number of symbols. After waiting a predetermined number of symbols after receiving the BFR response, the UE may reset or apply the identified candidate beams (e.g., downlink beams) communicated to the base station for all CORESETs in the failed cell (e.g., SCell). In some aspects, the term "resetting" may include applying the candidate beams to at least one component carrier.

[0217] At 814, the UE may apply the candidate beam to at least one of the plurality of component carriers. For example, for 5G NR, at least for PDCCH, after a predetermined number of symbols after receiving the BFR response to the step 2 MAC-CE, if a new beam is identified, then at least for DL ​​reception on the failed cell (e.g., SCell), the UE may apply the new beam indicated in the step 2 MAC-CE. This may be applied to all CORESETs in the failed cell.

[0218] In conjunction with this beam resetting rule, group CC based beam update may be used after receiving the step 2 MAC-CE response. For example, if the UE receives a TCI state activation / deactivation of a UE-specific physical downlink shared channel (PDSCH) MAC-CE identifying a given CC, the UE may apply the same TCI state set to all CCs in the same CC list as the identified CC.

[0219] In some aspects, after a predetermined number of symbols after receiving the BFR response from the base station, the UE may apply the new beam indicated in step 2 MAC-CE to at least DL reception on the failed cell (e.g., SCell). In some aspects, this procedure may be extended when a group CC-based beam update procedure is used. For example, after a predetermined number of symbols after receiving the SCell BFR response to step 2 MAC-CE indicating the failed CC with the identified new beam, if the base station has indicated an applicable CC list including the reported failed CC, the UE may apply the new beam identified in step 2 MAC-CE to each CC in the applicable CC list. Thus, when the UE reports a beam failure corresponding to a given CC corresponding to an SCell, the base station may respond with a new beam for that particular SCell. If such a CC list is configured, the UE may apply the new beam to the entire list of CCs in the same CC list.

[0220] As described herein, after receiving the BFR response, the UE 902 may use a beam resetting procedure for downlink control channel (PDCCH) transmissions. However, if the applicable CC list is used for group CC-based beam updating in the DL (e.g., the same set of activated TCI state IDs will be applied to all CCs in the group), the one or more resetting beams may be applied to all DL signals and channels, including, for example, all CORESETs, PDSCHs, CSI-RSs, etc. If the applicable CC list is used for group CC-based beam updating in the UL (e.g., the same spatial relationship information is applied to the same SRS resource ID on all CCs in the group), the one or more resetting beams may be applied to all UL signals and channels, including SRS, PUCCH, PUSCH, etc.

[0221] In some examples, the base station may indicate whether the one or more reset beams are applied to each CC in the CC list or only to the faulty CC. For example, the base station may provide an information element to the UE using any suitable control message (e.g., radio resource control (RRC), MAC-CE, downlink control information (DCI), etc.), which indicates how the UE is to apply the one or more reset beams, whether to apply to each CC in the CC list or only to the faulty CC.

[0222] In some aspects, the UE may apply the candidate beam to each of the multiple component carriers included in the list. For example, the base station may transmit an application indication indicating whether the UE is to apply the candidate beam to each of the multiple component carriers or to only apply the candidate beam to the first component carrier of the multiple component carriers. When the application indication indicates that the UE is to apply the candidate beam to each of the multiple component carriers, the UE may receive the application indication from the base station and apply the candidate beam to each of the multiple component carriers included in the list. In some aspects, the base station may transmit the application indication to the UE using at least one of a radio resource control (RRC) message, a MAC CE, or downlink control information (DCI).

[0223] In some aspects, the UE may apply the candidate beam only to the first component carrier of the multiple component carriers included in the list. For example, the base station may transmit an application indication indicating whether the UE is to apply the candidate beam to each component carrier of the multiple component carriers or to apply the candidate beam only to the first component carrier of the multiple component carriers. When the application indication indicates that the UE is to apply the candidate beam only to the first component carrier of the multiple component carriers, the UE may receive the application indication from the base station and apply the candidate beam only to the first component carrier of the multiple component carriers included in the list. In some aspects, the base station may transmit the application indication to the UE using at least one of a radio resource control (RRC) message, a MAC CE, or downlink control information (DCI). In combination with the above Fig.13 The illustrated and described transmitting circuitry 1342 in conjunction with the transceiver 1310 may provide means for transmitting a beam failure recovery response including an application indication to the UE indicating that the UE is to apply the candidate beam to at least one component carrier of the plurality of component carriers.

[0224] Fig.15 1500 is a flow chart of a method for beam resetting according to some aspects. As described below, some or all of the illustrated features may be omitted in certain implementations within the scope of the present disclosure, and some of the illustrated features may not be required to implement all aspects. In some examples, the method may be as described above and in Fig.13 The base station 1300 illustrated in FIG. 1 is executed by a processor or a processing system, or by any suitable means for performing the described functions.

[0225] In block 1502, the base station 1300 may transmit a list of multiple component carriers (CCs). For example, the base station may transmit the list of the multiple component carriers to the UE for the UE to identify the multiple component carriers from the list. In some aspects, during carrier aggregation (CA), the base station may provide one or more component carrier (CC) list sets to the UE using, for example, radio resource control (RRC) signaling. When there are multiple lists, the lists may not overlap. For example, the base station may transmit a first CC list indicating component carriers 1-7 (e.g., CC1-CC7) and a second CC list indicating component carriers 8-15 (e.g., CC8-CC15).

[0226] In some aspects, when a group CC-based beam update procedure is implemented and a TCI state identification (ID) set for a given PDSCH is activated by a MAC-CE for a CC / BWP set (at least for the same frequency band), the same TCI state ID set may be applied to all BWPs in the CC and also to all CCs in the CC list including the CC, if the applicable CC list is indicated by RRC signaling. Thus, if a CC is included in a CC list indicated by RRC signaling from a base station to a UE, the TCI state set may be applied to all CCs in the CC list, as well as all BWPs in all those CCs. Thus, the base station may not be required to provide a separate MAC-CE to activate a certain TCI state in all BWPs or CCs.

[0227] In some aspects, up to two CC lists may be configured per UE via RRC for the purpose of simultaneous TCI state activation across multiple CCs / BWPs. The UE may determine which list to apply the TCI state activation to via the CC indicated in the MAC-CE. The UE may expect that there are no overlapping CCs in multiple RRC configured CC lists. When spatial relationship information is activated for periodic / aperiodic (SP / AP) sounding reference signal (SRS) resources by a MAC-CE for at least a set of CCs / BWPs for the same frequency band, the spatial relationship information may be applied to the SP / AP SRS resources with the same SRS resource ID for all BWPs in the indicated CCs, if the applicable CC list is indicated by RRC signaling.

[0228] In some aspects, for the purpose of simultaneous spatial relation updates across multiple CCs / BWPs, up to two CC lists may be configured per UE via RRC. The UE may determine which list to apply the spatial relation update to via the CC indicated in the MAC-CE. The UE may not receive overlapping CCs in multiple RRC configured CC lists. These lists may be independent of those used for simultaneous TCI state activation.

[0229] In some aspects, the list may be used for group CC-based beam updates on the downlink. For example, after receiving the BFR response, the UE may use the beam reset procedure for downlink control channel (PDCCH) transmissions. However, if the applicable CC list is used for group CC-based beam updates in the DL (e.g., the same set of activated TCI state IDs will be applied to all CCs in the group), the one or more reset beams may be applied to all DL signals and channels, including, for example, all CORESETs, PDSCHs, CSI-RSs, etc. In some aspects, the list may be used for group CC-based beam updates on the uplink. For example, if the applicable CC list is used for group CC-based beam updates in the UL (e.g., the same spatial relationship information is applied to the same SRS resource ID on all CCs in the group), the one or more reset beams may be applied to all UL signals and channels, including SRS, PUCCH, PUSCH, etc. In combination with the above Fig.13 The transmit circuitry 1342 in conjunction with the transceiver 1310 is shown and described as providing means for transmitting a list of a plurality of component carriers (CCs).

[0230] In block 1504, the base station 1300 may receive a beam failure recovery request, the beam failure recovery request including an indication of a candidate beam. In some aspects, the base station may receive the BFR request from the UE in response to the UE detecting a beam failure. For example, upon detecting a beam failure, the UE may search for a candidate beam to restore connectivity. The UE may measure the quality (e.g., RSRP) of one or more reference signals on a given set of candidate beams received from the base station. If the measured quality is greater than a threshold (e.g., a predetermined threshold), the beam may be designated as a candidate beam and may be used to restore connectivity. Once the UE identifies the candidate beam, the UE may trigger the transmission of a beam failure recovery request to notify the base station that the UE has detected a beam failure. In some aspects, the beam failure recovery request may include information identifying a candidate beam found by the UE during the candidate beam search. In some aspects, the UE may utilize a random access procedure to transmit the beam failure recovery request to the base station. For example, the UE may implement the random access procedure by transmitting a random access preamble and a payload (msgA) to the base station. If the base station detects the random access preamble and decodes the payload, the base station may transmit a RAR or a message B (msgB) to the UE.

[0231] In some aspects, the payload of the random access message (msgA) transmitted by the UE may include information identifying the candidate beams. In some examples, each candidate beam may be associated with a specific random access preamble configuration. Thus, the base station may receive an indication of the candidate beams identified by the UE based on detecting the specific random access preamble configuration associated with the candidate beam. In some examples, the payload of the random access message transmitted by the UE may be a media access control (MAC) control element (MAC-CE) (e.g., step 2 MAC-CE). In some aspects, MAC-CE may refer to a series of steps in a beam failure recovery procedure implemented by the UE. In conjunction with the above Fig.13 The receive circuitry 1340 shown and described in conjunction with the transceiver 1310 may provide means for receiving a beam failure recovery request including an indication of a candidate beam.

[0232] At block 1506, the base station 1300 may transmit a beam failure recovery response. In some aspects, the base station may transmit a beam failure recovery response indicating whether a beam failure recovery request is received. For example, after a predetermined number of symbols after the UE receives a BFR response (e.g., a secondary cell (SCell) BFR response) to step 2 MAC-CE, the beams of all CORESETs in the failed SCell may be reset to or applied to the new beams (e.g., candidate beams) reported in step 2 MAC-CE. Thus, in each cell (e.g., SCell), if there is a beam failure, the UE may transmit an indication of the candidate beams to the base station via a BFR message (step 2 MAC-CE), and the base station may transmit a BFR response. After receiving the BFR response, the UE may wait for a predetermined number of symbols. After waiting for a predetermined number of symbols after receiving the BFR response, the UE may reset or apply the identified candidate beams (e.g., downlink beams) communicated to the base station for all CORESETs in the failed cell (e.g., SCell). In some aspects, the term "resetting" may include applying a candidate beam to at least one component carrier.

[0233] The UE may apply the candidate beams to all downlink channels in the list of the multiple component carriers. For example, the list of the multiple component carriers may be used for group CC (group component carrier)-based beam updates on the downlink. In response to receiving the list of multiple component carriers from the base station, the UE may determine that the list of multiple component carriers is used for group CC (group component carrier)-based beam updates on the downlink and apply the candidate beams to all downlink channels in the list of multiple component carriers. The UE may apply the candidate beams to all uplink channels in the list of the multiple component carriers. For example, the list of the multiple component carriers may be used for group CC (group component carrier)-based beam updates on the uplink. In response to receiving the list of multiple component carriers from the base station, the UE may determine that the list of multiple component carriers is used for group CC (group component carrier)-based beam updates on the uplink and apply the candidate beams to all uplink channels in the list of multiple component carriers.

[0234] In some examples, at least for PDCCH, after a predetermined number of symbols after receiving the BFR response to step 2 MAC-CE, if a new beam is identified, then at least for DL ​​reception on the failed cell (e.g., SCell), the UE may apply the new beam indicated in step 2 MAC-CE. This may be applied to all CORESETs in the failed cell.

[0235] In some aspects, after a predetermined number of symbols after receiving the BFR response from the base station, the UE may apply the new beam indicated in step 2 MAC-CE to at least DL reception on the failed cell (e.g., SCell). In some aspects, this procedure may be extended when a group CC-based beam update procedure is used. For example, after a predetermined number of symbols after receiving the SCell BFR response to step 2 MAC-CE indicating the failed CC with the identified new beam, if the base station has indicated an applicable CC list including the reported failed CC, the UE may apply the new beam identified in step 2 MAC-CE to each CC in the applicable CC list. Thus, when the UE reports a beam failure corresponding to a given CC corresponding to an SCell, the base station may respond with a new beam for that particular SCell. If such a CC list is configured, the UE may apply the new beam to the entire list of CCs in the same CC list.

[0236] As described herein, after receiving the BFR response, the UE 902 may use a beam resetting procedure for downlink control channel (PDCCH) transmissions. However, if the applicable CC list is used for group CC-based beam updating in the DL (e.g., the same set of activated TCI state IDs will be applied to all CCs in the group), the one or more reset beams may be applied to all DL signals and channels, including, for example, all CORESETs, PDSCHs, CSI-RSs, etc. If the applicable CC list is used for group CC-based beam updating in the UL (e.g., the same spatial relationship information is applied to the same SRS resource ID on all CCs in the group), the one or more reset beams may be applied to all UL signals and channels, including SRS, PUCCH, PUSCH, etc. In conjunction with the above Fig.13 The transmit circuitry 1342 in conjunction with the transceiver 1310 shown and described may provide a means for transmitting a beam failure recovery response.

[0237] In block 1508, the base station 1300 may transmit the application indication to the UE, the application indication indicating whether the UE is to apply the candidate beam to each of the multiple component carriers or to only the first component carrier of the multiple component carriers. For example, the base station may transmit the application indication indicating whether the UE is to apply the candidate beam to each of the multiple component carriers or to only the first component carrier of the multiple component carriers. When the application indication indicates that the UE is to apply the candidate beam to each of the multiple component carriers, the UE may receive the application indication from the base station and apply the candidate beam to each of the multiple component carriers included in the list. In some aspects, the base station may transmit the application indication to the UE using at least one of a radio resource control (RRC) message, a MAC CE, or downlink control information (DCI).

[0238] At 920, the UE may apply the candidate beam to each of the multiple component carriers based on the application indication. For example, the base station may transmit an application indication indicating whether the UE is to apply the candidate beam to each of the multiple component carriers or to only the first component carrier of the multiple component carriers. When the application indication indicates that the UE is to apply the candidate beam to each of the multiple component carriers, the UE may receive the application indication from the base station and apply the candidate beam to each of the multiple component carriers included in the list. In some aspects, the base station may transmit the application indication to the UE using at least one of a radio resource control (RRC) message, a MAC CE, or downlink control information (DCI). In some aspects, the UE applying the candidate beam to each of the multiple component carriers may include the UE applying the candidate beam to each of the multiple component carriers after a predetermined number of symbols after receiving a beam failure recovery response.

[0239] At 922, the UE may apply the candidate beam only to the first component carrier of the multiple component carriers included in the list. For example, the base station may transmit an application indication indicating whether the UE is to apply the candidate beam to each component carrier of the multiple component carriers or to apply the candidate beam only to the first component carrier of the multiple component carriers. When the application indication indicates that the UE is to apply the candidate beam only to the first component carrier of the multiple component carriers, the UE may receive the application indication from the base station and apply the candidate beam only to the first component carrier of the multiple component carriers included in the list. In some aspects, the base station may transmit the application indication to the UE using at least one of a radio resource control (RRC) message, a MAC CE, or downlink control information (DCI). In some aspects, the UE applying the candidate beam only to the first component carrier of the multiple component carriers may include the UE applying the candidate beam only to the first component carrier of the multiple component carriers after a predetermined number of symbols after receiving a beam failure recovery response. In combination with the above Fig.13 The transmission circuit system 1342 shown and described together with the transceiver 1310 may provide a device for transmitting the application indication to the UE, indicating whether the UE is to apply the candidate beam to each of the multiple component carriers or only to the first component carrier of the multiple component carriers.

[0240] In one configuration, the base station 1300 includes a Fig.14 and 15 In one aspect, the aforementioned means may be a device for performing the functions and processes described herein. Fig.13The processor 1304 shown in the figure is configured to perform the functions recited by the aforementioned means. On the other hand, the aforementioned means may be a circuit or any equipment configured to perform the functions recited by the aforementioned means.

[0241] Of course, in the above examples, the circuit system included in the processor 1304 is provided only as an example, and other means for performing the described functions may be included in various aspects of the present disclosure, including but not limited to instructions stored in the computer-readable storage medium 1306, or in Figure 1-4 , 7-10 and 13 and using, for example, the present invention with respect to Fig.14 and 15 Any other suitable apparatus or device that implements the described processes and / or algorithms.

[0242] In a first aspect, a wireless communication device (e.g., a UE) may identify a list of multiple component carriers (CCs). The wireless communication device may also detect a beam failure on a first component carrier of the multiple component carriers. The wireless communication device may further transmit a beam failure recovery request to a base station, the beam failure recovery request including a candidate beam indication of a candidate beam. In addition, the wireless communication device may receive a beam failure recovery response from the base station. The wireless communication device may apply the candidate beam to at least one component carrier of the multiple component carriers.

[0243] In a second aspect, alone or in combination with the first aspect, identifying a list of a plurality of component carriers comprises receiving the list of the plurality of component carriers from the base station.

[0244] In a third aspect, either alone or in combination with one or more of the first and second aspects, the wireless communication device may apply the candidate beam for all downlink channels in the list when the list of multiple component carriers is used for group CC-based beam update on the downlink.

[0245] In a fourth aspect, either alone or in combination with one or more of the first to third aspects, the wireless communication device may apply the candidate beam for all uplink channels in the list when the list of multiple component carriers is used for group CC-based beam update on the uplink.

[0246] In a fifth aspect, either alone or in combination with one or more of the first to fourth aspects, the wireless communication device may receive an application indication indicating whether the candidate beam is to be applied to each of the multiple component carriers or only to the first component carrier of the multiple component carriers.

[0247] In the sixth aspect, alone or in combination with one or more of the first to fifth aspects, based on the application indication, the wireless communication device that applies the candidate beam to the at least one component carrier among the multiple component carriers may apply the candidate beam to each component carrier among the multiple component carriers or only apply the candidate beam to the first component carrier among the multiple component carriers.

[0248] In a seventh aspect, either alone or in combination with one or more of the first to sixth aspects, the application indication may include one of a radio resource control (RRC) message, a MAC CE, or downlink control information (DCI).

[0249] In an eighth aspect, either alone or in combination with one or more of the first to seventh aspects, the wireless communication device that applies the candidate beam to the first component carrier among the multiple component carriers may apply the candidate beam to the at least one component carrier among the multiple component carriers after a predetermined number of code elements after receiving a beam failure recovery response.

[0250] In a ninth aspect, a base station in a wireless communication system may receive a beam failure recovery request from a UE, wherein the beam failure recovery request includes a candidate beam indication, wherein the candidate beam indication indicates a candidate beam based on detection of a beam failure of a first component carrier among multiple component carriers. The base station may also transmit a beam failure recovery response including an application indication to the UE, wherein the application indication indicates that the UE is to apply the candidate beam to at least one component carrier among the multiple component carriers.

[0251] In a tenth aspect, alone or in combination with the ninth aspect, the base station may transmit a list identifying the plurality of component carriers (CCs) to a user equipment (UE).

[0252] In the eleventh aspect, alone or in combination with one or more of the ninth and tenth aspects, the list may be used for group CC-based beam updates on the downlink, and the beam failure recovery response may include a downlink indication indicating that the UE is to apply the candidate beam to all downlink channels in the list of the multiple component carriers.

[0253] In the twelfth aspect, alone or in combination with one or more of the ninth to eleventh aspects, the list may be used for group CC-based beam updates on the uplink, and the beam failure recovery response may include an uplink indication indicating that the UE is to apply the candidate beam to all uplink channels in the list of the multiple component carriers.

[0254] In the thirteenth aspect, alone or in combination with one or more of the ninth to twelfth aspects, the base station may transmit the application indication to the UE, wherein the application indication indicates whether the UE is to apply the candidate beam to each of the multiple component carriers, or only to the first component carrier among the multiple component carriers.

[0255] In a fourteenth aspect, either alone or in combination with one or more of the ninth to thirteenth aspects, the application indication may include one of a radio resource control (RRC) message, a MAC CE, or downlink control information (DCI).

[0256] In the fifteenth aspect, either alone or in combination with one or more of the ninth to fourteenth aspects, the beam failure recovery response may include a timing indication indicating that the UE applies the candidate beam to the at least one component carrier among the multiple component carriers a predetermined number of symbols after receiving the beam failure recovery response.

[0257] In one configuration, a wireless communication device includes means for identifying a list of multiple component carriers (CCs), means for detecting a beam failure on a first component carrier of the multiple component carriers, means for transmitting a beam failure recovery request to a base station, the beam failure recovery request including a candidate beam indication for a candidate beam, means for receiving a beam failure recovery response from the base station, and means for applying the candidate beam to at least one component carrier of the multiple component carriers.

[0258] In one aspect, the aforementioned means for identifying a list of multiple component carriers (CCs), means for detecting a beam failure on a first component carrier of the multiple component carriers, means for transmitting a beam failure recovery request to a base station, the beam failure recovery request including a candidate beam indication for a candidate beam, means for receiving a beam failure recovery response from the base station, and means for applying the candidate beam to at least one component carrier of the multiple component carriers may be Fig.10 The processor(s) 1004 shown in FIG. 1 is configured to perform the functions described by the aforementioned apparatus. For example, the aforementioned apparatus for identifying a list of multiple component carriers (CCs) may include Fig.10 As another example, the aforementioned apparatus for detecting a beam failure on a first component carrier among the plurality of component carriers may include: Fig.10 As yet another example, the aforementioned means for transmitting a beam failure recovery request including a candidate beam indication for a candidate beam to a base station may include: Fig.10As another example, the aforementioned apparatus for receiving a beam failure recovery response from the base station may include: Fig.10 As yet another example, the aforementioned means for applying the candidate beam to at least one component carrier among the plurality of component carriers may include: Fig.10 The application circuit system 1048 is shown in FIG. In another aspect, the aforementioned means may be a circuit or any equipment configured to perform the functions recited by the aforementioned means.

[0259] In one configuration, a base station includes means for receiving a beam failure recovery request from a UE, the beam failure recovery request including a candidate beam indication indicating a candidate beam based on detection of a beam failure of a first component carrier among a plurality of component carriers, and means for transmitting a beam failure recovery response including an application indication to the UE, the application indication indicating that the UE is to apply the candidate beam to at least one component carrier among the plurality of component carriers.

[0260] In one aspect, the aforementioned apparatus for receiving a beam failure recovery request from a UE, the beam failure recovery request comprising a candidate beam indication, the candidate beam indication indicating a candidate beam based on detection of a beam failure of a first component carrier among a plurality of component carriers, and an apparatus for transmitting a beam failure recovery response comprising an application indication to the UE, the application indication indicating that the UE is to apply the candidate beam to at least one component carrier among the plurality of component carriers, which may be Fig.13 The processor(s) 1304 shown in the figure is configured to perform the functions described in the aforementioned apparatus. For example, the aforementioned apparatus for receiving a beam failure recovery request from a UE and including a candidate beam indication indicating a candidate beam based on the detection of a beam failure of a first component carrier among multiple component carriers may include Fig.13 As another example, the aforementioned device for transmitting to the UE a beam failure recovery response including an application indication indicating that the UE is to apply the candidate beam to at least one component carrier among the multiple component carriers may include: Fig.13 The transmitting circuit system 1342 and the transceiver 1310 shown in FIG. In another aspect, the aforementioned means may be a circuit or any equipment configured to perform the functions recited by the aforementioned means.

[0261] Several aspects of wireless communication networks have been presented with reference to exemplary implementations. As those skilled in the art will readily appreciate, the various aspects described throughout this disclosure may be extended to other telecommunication systems, network architectures and communication standards.

[0262] As an example, various aspects may be implemented within other systems defined by 3GPP, such as Long Term Evolution (LTE), Evolved Packet System (EPS), Universal Mobile Telecommunications System (UMTS), and / or Global System for Mobile (GSM). Various aspects may also be extended to systems defined by the Third Generation Partnership Project 2 (3GPP2), such as CDMA2000 and / or Evolution Data Optimized (EV-DO). Other examples may be implemented within systems employing IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Ultra Wideband (UWB), Bluetooth, and / or other suitable systems. The actual telecommunication standard, network architecture, and / or communication standard employed will depend on the specific application and the overall design constraints imposed on the system.

[0263] Within the present disclosure, the wording "exemplary" is used to mean "serving as an example, instance, or illustration". Any implementation or aspect described herein as "exemplary" is not necessarily to be construed as superior or superior to other aspects of the present disclosure. Likewise, the term "aspect" does not require that all aspects of the present disclosure include the features, advantages, or modes of operation discussed. The term "coupled" is used herein to refer to a direct or indirect coupling between two objects. For example, if object A physically contacts object B, and object B contacts object C, objects A and C may still be considered to be coupled to each other - even if they are not in direct physical contact with each other. For example, a first object may be coupled to a second object, even if the first object never directly contacts the second object physically. The terms "circuit" and "circuitry" are used broadly and are intended to include both hardware implementations of electronic devices and conductors and software implementations of information and instructions, which, when connected and configured, enable the functions described in the present disclosure to be performed without limitation on the type of electronic circuits, which, when executed by a processor, enable the functions described in the present disclosure to be performed.

[0264] Figure 1-15 One or more of the components, steps, features, and / or functions described herein may be rearranged and / or combined into a single component, step, feature, or function, or implemented in several components, steps, or functions. Additional elements, components, steps, and / or functions may also be added without departing from the novel features disclosed herein. Figure 1-4 , 7-10 and 13, the devices, apparatuses and / or components illustrated may be configured to perform one or more of the methods, features, or steps described herein. The novel algorithms described herein may also be efficiently implemented in software and / or embedded in hardware.

[0265] It should be understood that the specific order or hierarchy of steps in the disclosed methods is an illustration of an exemplary process. Based on design preferences, it should be understood that the specific order or hierarchy of steps in these methods can be rearranged. The attached method claims present elements of the various steps in a sample order and are not meant to be limited to the specific order or hierarchy presented unless specifically stated herein.

[0266] The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the universal principles defined herein may be applied to other aspects. Thus, the claims are not intended to be limited to the various aspects shown herein, but should be granted the full scope consistent with the language of the claims, wherein the singular reference to the element is not intended to mean "there is and only one" - unless specifically stated, but intended to mean "one or more". Unless specifically stated otherwise, the term "some / some" refers to one or more. The phrase "at least one" of a list of items refers to any combination of these items, including a single member. As an example, "at least one of a, b or c" is intended to cover: a; b; c; a and b; a and c; b and c; and a, b and c. The elements of the various aspects described throughout this disclosure are all structurally and functionally equivalent solutions currently or hereafter known to those of ordinary skill in the art, and are expressly incorporated herein by reference, and are intended to be covered by the claims. In addition, nothing disclosed herein is intended to be donated to the public, regardless of whether such disclosure is explicitly recorded in the claims.

Claims

1. A method for wireless communication at a user equipment (UE), the method comprising: A list identifying a plurality of component carriers (CCs); detecting a beam failure on a first component carrier of the plurality of component carriers; transmitting a beam failure recovery request to a base station, wherein the beam failure recovery request includes a candidate beam indication for the candidate beam; receiving a beam failure recovery response from the base station, the beam failure recovery response comprising an application indication, the application indication indicating whether to apply the candidate beam to each of the plurality of component carriers or to apply the candidate beam only to the first component carrier among the plurality of component carriers; as well as The candidate beam is applied to at least one component carrier among the plurality of component carriers based on the application indication.

2. The method of claim 1, wherein identifying the list of the plurality of component carriers comprises receiving the list of the plurality of component carriers from the base station.

3. The method of claim 1, further comprising: The candidate beams are applied to all downlink channels of all of the plurality of component carriers in the list of the plurality of component carriers.

4. The method of claim 1, further comprising: The candidate beams are applied to all uplink channels of all of the plurality of component carriers in the list of the plurality of component carriers.

5. The method of claim 1, wherein: Applying the candidate beam to the at least one component carrier among the multiple component carriers based on the application indication includes: applying the candidate beam to each component carrier of the plurality of component carriers, or The candidate beam is applied only to the first component carrier of the plurality of component carriers.

6. The method of claim 1, wherein the application indication comprises one of a radio resource control (RRC) message, a medium access control control element (MAC CE), or downlink control information (DCI).

7. The method of claim 1 , wherein applying the candidate beam to the at least one component carrier of the plurality of component carriers comprises: The candidate beam is applied to the at least one component carrier of the plurality of component carriers after a predetermined number of symbols after receiving the beam failure recovery response.

8. A method for wireless communication at a base station, the method comprising: receiving a beam failure recovery request from a user equipment (UE), the beam failure recovery request comprising a candidate beam indication, the candidate beam indication indicating a candidate beam based on a beam failure of a first component carrier among a plurality of component carriers; as well as A beam failure recovery response is transmitted to the UE, including an application indication indicating that the UE is to apply the candidate beam to at least one component carrier among the multiple component carriers, the application indication further indicating whether the UE is to apply the candidate beam to each component carrier among the multiple component carriers or only to the first component carrier among the multiple component carriers.

9. The method of claim 8, further comprising: A list identifying the plurality of component carriers (CCs) is transmitted to a user equipment (UE).

10. The method of claim 9, wherein the beam failure recovery response comprises a downlink indication indicating that the UE is to apply the candidate beam to all downlink channels of all of the plurality of component carriers in the list of the plurality of component carriers.

11. The method of claim 9, wherein the beam failure recovery response comprises an uplink indication indicating that the UE is to apply the candidate beam to all uplink channels of all of the plurality of component carriers in the list of the plurality of component carriers.

12. The method of claim 8, wherein the application indication comprises one of a radio resource control (RRC) message, a medium access control control element (MAC CE), or downlink control information (DCI).

13. The method of claim 8, wherein the beam failure recovery response includes a timing indication, the timing indication indicating that the UE applies the candidate beam to the at least one component carrier among the multiple component carriers to occur after a predetermined number of code elements after receiving the beam failure recovery response.

14. A user equipment (UE) for wireless communication in a wireless communication network, comprising: Wireless transceiver; Memory; as well as a processor communicatively coupled to the wireless transceiver and the memory, wherein the processor and the memory are configured to: a list identifying a plurality of component carriers (CCs), detecting a beam failure on a first component carrier of the plurality of component carriers, transmitting a beam failure recovery request to a base station, wherein the beam failure recovery request includes a candidate beam indication for a candidate beam, receiving a beam failure recovery response from the base station, the beam failure recovery response comprising an application indication, the application indication indicating whether to apply the candidate beam to each of the plurality of component carriers or to apply the candidate beam only to the first component carrier among the plurality of component carriers, and The candidate beam is applied to at least one component carrier among the plurality of component carriers based on the application indication.

15. The UE of claim 14, wherein identifying the list of the plurality of component carriers comprises receiving the list of the plurality of component carriers from the base station.

16. The UE of claim 14, wherein the processor and the memory are further configured to: The candidate beams are applied to all downlink channels of all of the plurality of component carriers in the list of the plurality of component carriers.

17. The UE of claim 14, wherein the processor and the memory are further configured to: The candidate beams are applied to all uplink channels of all of the plurality of component carriers in the list of the plurality of component carriers.

18. The UE according to claim 14, wherein: Applying the candidate beam to the at least one component carrier among the multiple component carriers based on the application indication includes: applying the candidate beam to each component carrier of the plurality of component carriers, or The candidate beam is applied only to the first component carrier of the plurality of component carriers.

19. The UE of claim 14, wherein the application indication comprises one of a radio resource control (RRC) message, a medium access control control element (MAC CE), or downlink control information (DCI).

20. The UE of claim 14, wherein applying the candidate beam to the at least one component carrier among the plurality of component carriers comprises: The candidate beam is applied to the at least one component carrier of the plurality of component carriers after a predetermined number of symbols after receiving the beam failure recovery response.

21. A user equipment (UE), comprising: means for identifying a list of a plurality of component carriers (CCs); means for detecting a beam failure on a first component carrier of the plurality of component carriers; means for transmitting a beam failure recovery request to a base station, the beam failure recovery request comprising a candidate beam indication for a candidate beam; means for receiving a beam failure recovery response from the base station, the beam failure recovery response comprising an application indication, the application indication indicating whether to apply the candidate beam to each of the plurality of component carriers or to apply the candidate beam only to the first component carrier of the plurality of component carriers; as well as means for applying the candidate beam to at least one component carrier of the plurality of component carriers based on the application indication.

22. The UE of claim 21, wherein identifying the list of the plurality of component carriers comprises receiving the list of the plurality of component carriers from the base station.

23. The UE of claim 21, further comprising: means for applying the candidate beams to all downlink channels of all of the plurality of component carriers in the list of the plurality of component carriers.

24. The UE of claim 21, further comprising: means for applying the candidate beams to all uplink channels of all of the plurality of component carriers in the list of the plurality of component carriers.

25. The UE according to claim 21, wherein: Applying the candidate beam to the at least one component carrier among the multiple component carriers based on the application indication includes: applying the candidate beam to each component carrier of the plurality of component carriers, or The candidate beam is applied only to the first component carrier of the plurality of component carriers.

26. The UE of claim 21, wherein the application indication comprises one of a radio resource control (RRC) message, a medium access control control element (MAC CE), or downlink control information (DCI).

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