Beam failure recovery operation for discontinuous reception mode

Abstract

Techniques are described that implement and provide beam failure recovery (BFR) operations for discontinuous reception (DRX) mode with wake-up signal (WUS) monitoring. DRX mode operation can be changed based on a BFR procedure implemented by a user equipment (UE). The DRX mode operation can be changed to allow the UE to start a DRX active time after transmitting a BFR request signal for the BFR procedure. Additionally or alternatively, the DRX mode operation can be changed to allow the UE to start an on-duration timer for a next DRX cycle after transmitting the BFR request signal for the BFR procedure. In another example, the DRX mode operation can be changed to allow the UE to monitor a BFR search space set after transmitting the BFR request signal for the BFR procedure regardless of a DRX state. Other aspects and features are also claimed and described.

Description

[0001] Cross-reference to related applications

[0002] This application claims the benefit of U.S. Application No. 17 / 449,048, filed September 27, 2021, entitled “BEAM FAILURE RECOVERY OPERATION FOR DISCONTINUOUS RECEPTION MODE,” and U.S. Provisional Patent Application No. 63 / 087,007, filed October 2, 2020, entitled “BEAM FAILURE RECOVERY OPERATION FOR DISCONTINUOUS RECEPTION MODE WITH WAKEUP SIGNAL MONITORING,” the entire contents of which are expressly incorporated herein by reference. Technical Field

[0003] This disclosure generally relates to wireless communication systems, and more particularly to beam fault recovery (BFR) operation. Certain embodiments of the techniques discussed below can implement and provide BFR operation for discontinuous reception (DRX) mode with wake-up signal (WUS) monitoring.

[0004] introduction

[0005] Wireless communication networks are widely deployed to provide various communication services, such as voice, video, packet data, message sending and receiving, broadcasting, and so on. These wireless networks can be multiple-access networks capable of supporting multiple users by sharing available network resources. Typically, such multiple-access networks support communication for multiple users by sharing available network resources.

[0006] A wireless communication network may include several base stations or B-nodes capable of supporting communication between several user equipments (UEs). UEs may communicate with base stations via downlinks and uplinks. A downlink (or forward link) refers to the communication link from the base station to the UE, while an uplink (or reverse link) refers to the communication link from the UE to the base station.

[0007] As UEs become smaller and the services offered on them grow, the space occupied by the hardware within these UEs becomes increasingly scarce and expensive. Users also expect their UEs to have improved battery life. While the obvious solution to improving battery life is to include larger batteries that store more energy, this solution is limited by the aforementioned space constraints. Thus, instead of improving battery life through battery size and storage capacity, the industry has implemented operating modes that attempt to increase battery life by reducing the power consumption of the UE. By using such techniques, batteries with the same storage capacity can last longer because less stored energy is being used.

[0008] An example of an operating mode that attempts to reduce UE power consumption is the Discontinuous Receive (DRX) mode. In DRX mode operation, the UE enters a sleep mode for a specific period of time and wakes up for another period of time, where the UE monitors the Physical Downlink Control Channel (PDCCH) during a specified active duration of each DRX cycle. For example, under dual-mode DRX mode, when in the Radio Resource Control (RRC) idle mode of DRX operation (referred to as RRC-idle DRX or I-DRX), the UE operates by discontinuously monitoring the PDCCH (e.g., the UE monitors the P-RNTI (Paging Radio Network Temporary Identifier) ​​in the PDCCH at predetermined intervals (such as every 640ms or 1280ms)) to reduce UE power consumption. In contrast to the I-DRX mode, which is primarily designed for paging monitoring and optimized for receive-only operation, the Connected DRX (C-DRX) mode is designed for RRC connections between the UE and the base station, where the UE is expected to perform both receiving and transmitting. In C-DRX mode operation, even if the traffic is downlink mobile terminal (MT) data, the UE still needs to transmit control signaling in the uplink to facilitate the data, such as feedback confirmation of decoded data. Accordingly, C-DRX mode provides an "on duration" during which the UE can operate to receive and transmit and monitor the PDCCH.

[0009] UE status information (such as timing synchronization and information about the radio channel) may become outdated during sleep periods. Therefore, when the UE exits sleep and performs a wake-up (WU) procedure to transition to C-DRX mode, it may perform operations such as automatic gain control (AGC), time tracking loop (TTL), frequency tracking loop (FTL), and channel estimation. This WU procedure consumes significant power. Performing the WU procedure according to the schedule when no data is actually being received is a waste of power and unnecessarily shortens battery life. Accordingly, the UE can be configured to monitor wake-up signals (WUS) associated with DRX mode operation. By using this WUS monitoring, whether the UE wakes up (e.g., performs a WU phase operation) during the on-time period is conditional upon detecting WUS. The use of WUS thus avoids performing the WU procedure when there is actually no data to be received by the UE.

[0010] Overview

[0011] The following outlines some aspects of this disclosure to provide a basic understanding of the techniques discussed. This overview is not an exhaustive summary of all conceived features of this disclosure, and is neither intended to identify all key or decisive elements of all aspects of this disclosure, nor to define the scope of any or all aspects of this disclosure. Its sole purpose is to provide, in an overview form, some concepts of one or more aspects of this disclosure as a prelude to the more detailed description that follows.

[0012] In one aspect of this disclosure, a method for wireless communication is provided. The method may include: detecting a beam fault by a user equipment (UE) operating according to a discontinuous reception (DRX) mode; and transmitting a BFR request signal in response to the detected beam fault, according to a contention-free random access (CFRA)-based beam fault recovery (BFR) procedure implemented by the UE. The method may further include: changing DRX mode operation based on the CFRA-based BFR procedure implemented by the UE.

[0013] In an additional aspect of this disclosure, an apparatus for wireless communication is provided. The apparatus may include means for detecting a beam fault by a UE operating according to DRX mode; and means for transmitting a BFR request signal according to a CFRA-based BFR procedure implemented by the UE in response to detecting the beam fault. The apparatus may further include means for changing DRX mode operation based on the CFRA-based BFR procedure implemented by the UE.

[0014] In an additional aspect of this disclosure, a non-transient computer-readable medium having program code for wireless communication recorded thereon is provided. The program code may include: code for detecting a beam fault by a UE operating according to DRX mode; and code for transmitting a BFR request signal according to a CFRA-based BFR procedure implemented by the UE in response to detecting the beam fault. The program code may also include: code for changing DRX mode operation based on the CFRA-based BFR procedure implemented by the UE.

[0015] In an additional aspect of this disclosure, an apparatus configured for wireless communication is provided. The apparatus includes at least one processor and a memory coupled to the processor. The processor is configured to detect beam faults by a UE operating in DRX mode; and in response to detecting the beam fault, to transmit a BFR request signal according to a CFRA-based BFR procedure implemented by the UE. The processor is also configured to change DRX mode operation based on the CFRA-based BFR procedure implemented by the UE.

[0016] In some examples of the methods, apparatus (devices) and articles of art including non-transient computer-readable media described herein, the BFR request signal includes a random access channel (RACH preamble) and an associated message of a CFRA-based BFR procedure.

[0017] In some examples of the methods, apparatus (devices) and articles of art including non-transient computer-readable media described herein, changing DRX mode operation includes: initiating DRX active time.

[0018] In some examples of the methods, apparatuses, and articles of art including non-transient computer-readable media described herein, initiating the DRX active time includes: triggering a DRX timer based on the UE receiving a scheduled Media Access Control (MAC) Protocol Data Unit (PDU) Physical Downlink Control Channel (PDCCH) according to a CFRA-based BFR procedure, regardless of whether the UE is operating within the active time of the DRX mode when it receives the PDCCH of the scheduled MAC PDU.

[0019] In some examples of the methods, apparatus (devices) and articles of manufacture including non-transient computer-readable media described herein, the DRX timer includes one or more timers selected from inactive timers, round-trip time (RTT) timers, and retransmission timers.

[0020] In some examples of the methods, apparatus (devices) and articles of art including non-transient computer-readable media described herein, the DRX active time includes the definition of the DRX mode as including the active time of BFR procedural activities performed by the UE.

[0021] In some examples of the methods, apparatus (devices) and articles of art including non-transient computer-readable media described herein, the DRX mode is a wake-up signal (WUS) triggered DRX mode.

[0022] In some examples of the methods, apparatus (devices) and articles of art including non-transient computer-readable media described herein, changing DRX mode operation includes: after the UE transmits the BFR request signal, focusing the BFR search space on monitoring the WUS at least for the next DRX cycle.

[0023] In some examples of the methods, apparatus (devices) and articles of art including non-transient computer-readable media described herein, changing DRX mode operation includes: changing the spatial filter of WUS used to receive at least for the next DRX cycle after the UE transmits the BFR request signal.

[0024] In some examples of the methods, apparatus (devices) and articles of art including non-transient computer-readable media described herein, altering the spatial filter used to receive the WUS includes: applying a quasi-co-position (QCL) assumption to the candidate beams of a CFRA-based BFR protocol to the spatial filter used to receive the WUS.

[0025] In some examples of the methods, apparatus (devices) and articles of manufacture including non-transient computer-readable media described herein, altering the spatial filter used to receive the WUS includes: using a second resource configuration for the WUS, wherein the second resource configuration for the WUS is different from the first WUS resource configuration used before the beam fault was detected.

[0026] In some examples of the methods, apparatus (devices) and articles of manufacture including non-transient computer-readable media described herein, the second resource configuration for the WUS includes at least one of a control resource set, a search space set, or a downlink control information format.

[0027] In some examples of the methods, apparatus (devices) and articles of art including non-transient computer-readable media described herein, the search space set used for the WUS is the same as the BFR search space set associated with the CFRA-based BFR procedure.

[0028] In some examples of the methods, apparatus (devices) and articles of art including non-transient computer-readable media described herein, changing DRX mode operation includes: adopting a non-WUS-triggered DRX mode operation in which, whether the UE receives or does not receive the WUS, the next DRX cycle is initiated after transmitting the BFR request signal.

[0029] In some examples of the methods, apparatus (devices) and articles of art including non-transient computer-readable media described herein, changing DRX mode operation includes: the UE monitoring the BFR search space set after transmitting the BFR request signal, regardless of whether the UE is operating during the active period of the DRX mode.

[0030] In some examples of the methods, apparatus (devices) and articles of art including non-transient computer-readable media described herein, monitoring the BFR search space set by the UE after transmitting the BFR request signal includes: monitoring the BFR search space set by the UE regardless of whether the UE is operating within a random access response (RAR) window of a CFRA-based BFR procedure.

[0031] In one aspect of this disclosure, a method for wireless communication is provided. The method may include: receiving a BFR request signal according to a CFRA-based BFR procedure implemented by a UE. The BFR request signal may be provided in association with a beam fault detected by a UE operating in a WUS-triggered DRX mode. The method may further include: changing DRX mode operation based on the CFRA-based BFR procedure implemented by the UE.

[0032] In an additional aspect of this disclosure, an apparatus for wireless communication is provided. The apparatus may include means for receiving a BFR request signal according to a CFRA-based BFR procedure implemented by a UE. The BFR request signal may be provided in association with a beam fault detected by a UE operating in a WUS-triggered DRX mode. The apparatus may also include: changing DRX mode operation based on the CFRA-based BFR procedure implemented by the UE.

[0033] In an additional aspect of this disclosure, a non-transient computer-readable medium having program code for wireless communication recorded thereon is provided. The program code may include: code for receiving a BFR request signal according to a CFRA-based BFR procedure implemented by a UE. The BFR request signal may be provided in association with a beam fault detected by a UE operating according to a WUS-triggered DRX mode. The program code may also include: code for changing DRX mode operation based on a CFRA-based BFR procedure implemented by the UE.

[0034] In an additional aspect of this disclosure, an apparatus configured for wireless communication is provided. The apparatus includes at least one processor and a memory coupled to the processor. The processor can be configured to receive a BFR request signal according to a CFRA-based BFR procedure implemented by a UE. The BFR request signal can be provided in association with a beam fault detected by a UE operating according to a WUS-triggered DRX mode. The processor can also be configured to change DRX mode operation based on the CFRA-based BFR procedure implemented by the UE.

[0035] In some examples of the methods, apparatus (devices) and articles of art including non-transient computer-readable media described herein, changing DRX mode operation includes: changing the spatial filter of WUS used for at least the next DRX cycle after receiving the BFR request signal.

[0036] In some examples of the methods, apparatus (devices) and articles of manufacture including non-transient computer-readable media described herein, altering the spatial filter used for the WUS includes: applying a QCL assumption to a candidate beam based on a CFRA-based BFR procedure for the spatial filter used to receive the WUS.

[0037] In some examples of the methods, apparatus (devices) and articles of manufacture including non-transient computer-readable media described herein, altering the spatial filter used for the WUS includes: using a second resource configuration for the WUS, wherein the second resource configuration for the WUS is different from the first WUS resource configuration used before the beam fault was detected.

[0038] In some examples of the methods, apparatus (devices) and articles of manufacture including non-transient computer-readable media described herein, the second resource configuration for the WUS includes at least one of a control resource set, a search space set, or a downlink control information format.

[0039] In some examples of the methods, apparatus (devices) and articles of art including non-transient computer-readable media described herein, the search space set used for the WUS is the same as the BFR search space set associated with the CFRA-based BFR procedure.

[0040] Other aspects, features, and embodiments will become apparent to those skilled in the art after reading the following description of specific exemplary embodiments in conjunction with the accompanying drawings. Although features may be discussed hereinafter with reference to certain aspects and drawings, all embodiments may include one or more of the advantageous features discussed herein. In other words, although one or more aspects may be discussed having certain advantageous features, one or more such features may also be used depending on various aspects. Similarly, although exemplary aspects may be discussed hereinafter as aspects of an apparatus, system, or method, exemplary aspects may be implemented in various apparatuses, systems, and methods. Brief description of the attached diagram

[0042] A further understanding of the nature and advantages of this disclosure can be obtained by referring to the following figures. In the figures, similar components or features may have the same reference numerals. Furthermore, components of the same type may be distinguished by a dash following the reference numeral and a second reference numeral used to differentiate between similar components. If only the first reference numeral is used in the description, the description may be applied to any of the similar components having the same first reference numeral regardless of the second reference numeral.

[0043] Figure 1 This is a block diagram illustrating the details of a wireless communication system according to some embodiments of the present disclosure.

[0044] Figure 2 This is a block diagram that conceptually illustrates the design of a base station and a UE configured according to some embodiments of this disclosure.

[0045] Figure 3 This is a timing diagram illustrating beam fault recovery (BFR) initiated outside the active time of discontinuous reception (DRX) mode according to some embodiments of the present disclosure.

[0046] Figure 4 This is a block diagram illustrating a process for providing BFR operation by user equipment (UE) for DRX mode with WUS monitoring, according to some embodiments of the present disclosure.

[0047] Figure 5 This is a block diagram illustrating a process provided by base station operation to facilitate BFR operation for DRX mode with WUS monitoring, according to some embodiments of the present disclosure.

[0048] Figure 6 This is a block diagram conceptually illustrating the design of a UE configured to change DRX mode operation based on BFR procedures implemented by the UE, according to some embodiments of this disclosure.

[0049] Figure 7This is a block diagram conceptually illustrating the design of a base station configured to change DRX mode operation based on a BFR procedure implemented by the UE, according to some embodiments of this disclosure.

[0050] Detailed description

[0051] The detailed description that follows, taken in conjunction with the accompanying drawings, is intended to describe various configurations and is not intended to limit the scope of this disclosure. Rather, this detailed description includes specific details to provide a thorough understanding of the subject matter of the invention. It will be apparent to those skilled in the art that these specific details are not required in every situation, and in some instances, well-known structures and components are shown in block diagram form for clarity of expression.

[0052] This disclosure generally relates to providing or participating in licensed shared access between two or more wireless devices in one or more wireless communication systems (also referred to as wireless communication networks). In various implementations, technologies and apparatus can be used in wireless communication networks such as Code Division Multiple Access (CDMA) networks, Time Division Multiple Access (TDMA) networks, Frequency Division Multiple Access (FDMA) networks, Orthogonal FDMA (OFDMA) networks, Single Carrier FDMA (SC-FDMA) networks, LTE networks, GSM networks, fifth-generation (5G) or new radio (NR) networks (sometimes referred to as "5G NR" networks / systems / devices), and other communication networks. As described herein, the terms "network" and "system" may be used interchangeably.

[0053] CDMA networks can implement radio technologies such as Universal Terrestrial Radio Access (UTRA) and CDMA2000. UTRA includes Wideband CDMA (W-CDMA) and Low Chip Rate (LCR). CDMA2000 covers the IS-2000, IS-95, and IS-856 standards.

[0054] TDMA networks can implement radio technologies such as the Global System for Mobile Communications (GSM). The 3rd Generation Partnership Project (3GPP) defines the standard for the Radio Access Network (RAN) (also referred to as GERAN) for GSM EDGE (Enhanced Data Rate GSM Evolution). GERAN is the radio component of GSM / EDGE along with the network that connects base stations (e.g., Ater and Abis interfaces) to base station controllers (A interface, etc.). The radio access network represents the component of the GSM network through which telephone calls and packet data are routed from the Public Switched Telephone Network (PSTN) and the Internet to the subscriber's handset (also called user terminal or user equipment (UE)) and from the subscriber's handset to the PSTN and the Internet. A mobile phone operator's network may include one or more GERANs, which may be coupled to the Universal Terrestrial Radio Access Network (UTRAN) in the case of UMTS / GSM networks. Additionally, the operator's network may also include one or more LTE networks, and / or one or more other networks. Different network types may use different Radio Access Technologies (RATs) and Radio Access Networks (RANs).

[0055] OFDMA networks can implement radio technologies such as Evolved UTRA (E-UTRA), IEEE 802.11, IEEE 802.16, IEEE 802.20, and flash-OFDM. UTRA, E-UTRA, and GSM are part of the Universal Mobile Telecommunications System (UMTS). Specifically, Long Term Evolution (LTE) is a UMTS version using E-UTRA. UTRA, E-UTRA, GSM, UMTS, and LTE are described in documents from an organization called the 3rd Generation Partnership Project (3GPP), while cdma2000 is described in documents from an organization called 3rd Generation Partnership Project 2 (3GPP2). These various radio technologies and standards are known or under development. For example, 3GPP is a collaboration between various telecommunications association groups that aims to define globally applicable third-generation (3G) mobile phone specifications. 3GPP Long Term Evolution (LTE) is a 3GPP project aimed at improving the Universal Mobile Telecommunications System (UMTS) mobile phone standard. 3GPP defines specifications for next-generation mobile networks, mobile systems, and mobile devices. This disclosure may describe certain aspects with reference to LTE, 4G, or 5G NR technologies; however, this description is not intended to be limited to any particular technology or application, and one or more aspects described with reference to one technology may be understood to be applicable to another technology. In fact, one or more aspects of this disclosure relate to shared access to radio spectrum between networks using different radio access technologies or radio air interfaces.

[0056] 5G networks envision a variety of deployments, spectrums, services, and devices that can be implemented using a unified OFDM-based air interface. To achieve these goals, in addition to developing new radio technologies for 5G NR networks, further enhancements to LTE and LTE-A are also considered. 5G NR will be able to scale to provide coverage for: (1) ultra-high density (e.g., approximately 1 M nodes / km) 2 (1) A massive Internet of Things (IoT) with ultra-low complexity (e.g., approximately tens of bits per second), ultra-low energy consumption (e.g., approximately 10+ years of battery life), and deep coverage capable of reaching challenging locations; (2) A massive Internet of Things (IoT) with robust security (to protect sensitive personal, financial, or confidential information), ultra-high reliability (e.g., approximately 99.9999% reliability), ultra-low latency (e.g., approximately 1 millisecond (ms)), and mission-critical control for users with a wide range of mobility or lack of mobility; and (3) Enhanced mobile broadband, including extremely high capacity (e.g., approximately 10 Tbps / km). 2 Extreme data rates (e.g., multi-Gbps rates, 100+Mbps user experience rates), and deep insights with advanced discovery and optimization.

[0057] Base station 105 and UE 115 can be configured to communicate via one or more portions of the electromagnetic spectrum. 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 designated as frequency ranges FR1 (410MHz–7.125GHz) and FR2 (24.25GHz–52.6GHz). The frequencies between FR1 and FR2 are generally referred to as mid-band frequencies. Although a portion of FR1 is greater than 6GHz, FR1 is often (interchangeably) referred to as the “sub-6GHz” band in various documents and articles. Similar naming issues sometimes arise regarding FR2; although different from the Very High Frequency (EHF) band (30GHz–300GHz) designated as the “mmWave” band by the International Telecommunication Union (ITU), FR2 is often (interchangeably) referred to as the “mmWave” band in various documents and articles.

[0058] In light of the foregoing, unless otherwise stated, it should be understood that, as used herein, the term "sub-6GHz" and the like can broadly refer to frequencies less than 6GHz, within FR1, or including intermediate frequency band frequencies. Furthermore, unless otherwise stated, it should be understood that, as used herein, the term "mmWave" and the like can broadly refer to frequencies that can include intermediate frequency band frequencies, within FR2, or within the EHF band.

[0059] 5G NR devices, networks, and systems can utilize optimized OFDM-based waveform characteristics. These characteristics can include: scalable parameter design and transmission time intervals (TTI); a shared, flexible framework for efficiently multiplexing services and features using dynamic, low-latency Time Division Duplex (TDD) / Frequency Division Duplex (FDD) designs; and advanced radio technologies such as massive MIMO, robust millimeter-wave (mmWave) transmission, advanced channel coding, and device-centric mobility. The scalability of parameter design in 5G NR (and the scaling of subcarrier spacing) can efficiently address the operation of diverse services across diverse spectrum and deployments. For example, in various outdoor and macro coverage deployments implemented with FDD / TDD below 3 GHz, subcarrier spacing can occur at 15 kHz over bandwidths such as 1, 5, 10, and 20 MHz. For other various outdoor and small-cell coverage deployments with TDD above 3 GHz, subcarrier spacing can occur at 30 kHz over an 80 / 100 MHz bandwidth. For various other indoor broadband implementations, by using TDD in the unlicensed portion of the 5 GHz band, the subcarrier spacing can occur at 60 kHz over a 160 MHz bandwidth. Finally, for various deployments transmitting mmWave components under TDD at 28 GHz, the subcarrier spacing can occur at 120 kHz over a 500 MHz bandwidth.

[0060] 5G NR's scalable parameter design enables scalable TTIs to meet various latency and Quality of Service (QoS) requirements. For example, shorter TTIs can be used for low latency and high reliability, while longer TTIs can be used for higher spectral efficiency. Efficient multiplexing of long and short TTIs allows transmissions to begin at symbol boundaries. 5G NR also envisions a self-contained integrated subframe design that incorporates uplink / downlink scheduling information, data, and acknowledgments within the same subframe. Self-contained integrated subframes support communication in unlicensed or contention-based shared spectrum and support adaptive uplink / downlink that can be flexibly configured on a per-cell basis to dynamically switch between uplink and downlink to meet current traffic needs.

[0061] For clarity, aspects of the devices and technologies may be described below with reference to example 5G NR implementations or in a 5G-centric manner, and 5G terminology may be used in various sections of the following description as illustrative examples; however, this description is not intended to be limited to 5G applications.

[0062] Furthermore, it should be understood that in operation, wireless communication networks adapted according to the concepts herein can be operated using any combination of licensed or unlicensed spectrum, depending on load and availability. Accordingly, it will be apparent to those skilled in the art that the systems, apparatuses, and methods described herein can be applied to other communication systems and applications different from the specific examples provided.

[0063] While aspects and implementations are described herein by way of example, those skilled in the art will understand that additional implementations and use cases may arise in many different arrangements and scenarios. The innovations described herein can be implemented across many different platform types, devices, systems, shapes, sizes, and package arrangements. For example, embodiments and / or uses may arise via integrated chip embodiments and / or other devices based on non-modular components (e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail / shopping devices, medical devices, AI-enabled devices, etc.). While some examples may or may not be specific to particular use cases or applications, broad applicability of the described innovations is possible. Implementations can range from chip-level or modular components to non-modular, non-chip-level implementations, and further to aggregated, distributed, or OEM devices or systems incorporating one or more of the described aspects. In some practical contexts, devices incorporating the described aspects and features may also necessarily include additional components and features for implementing and practicing the claimed and described embodiments. The innovations described in this paper are intended to be implemented in a wide variety of ways, including both large and small devices of different sizes, shapes and configurations, chip-level components, multi-component systems (e.g., RF chains, communication interfaces, processors), distributed deployments, end-user devices, and so on.

[0064] Figure 1 This is a block diagram illustrating the details of an example wireless communication system. The wireless communication system may include a wireless network 100. Wireless network 100 may, for example, include a 5G wireless network. As those skilled in the art will appreciate, Figure 1 The components appearing in this network likely have corresponding parts in other network deployments (including, for example, cellular network deployments and non-cellular network deployments (e.g., device-to-device, peer-to-peer, or self-organizing network deployments, etc.)).

[0065] Figure 1The wireless network 100 described herein includes several base stations 105 and other network entities. A base station can be a station communicating with a UE and may also be referred to as an evolved B-node (eNB), a next-generation eNB (gNB), an access point, etc. Each base station 105 can provide communication coverage for a specific geographic area. In 3GPP, the term "cell" can refer to such a specific geographic coverage area of ​​a base station and / or a base station subsystem serving that coverage area, depending on the context in which the term is used. In the implementation of the wireless network 100 herein, base stations 105 may be associated with the same operator or different operators (e.g., the wireless network 100 may include multiple operator wireless networks). Additionally, in the implementation of the wireless network 100 herein, base stations 105 may use one or more frequencies (e.g., licensed spectrum, unlicensed spectrum, or one or more bands of a combination thereof) from the same frequencies as adjacent cells to provide wireless communication. In some examples, an individual base station 105 or UE 115 may be operated by more than one network operating entity. In some other examples, each base station 105 and UE 115 may be operated by a single network operating entity.

[0066] Base stations can provide communication coverage for macrocells or small cells (such as picocells or femtocells), and / or other types of cells. Macrocells typically cover a relatively large geographic area (e.g., a radius of several kilometers) and allow unrestricted access by UEs with service subscriptions to a network provider. Small cells (such as picocells) typically cover a relatively small geographic area and allow unrestricted access by UEs with service subscriptions to a network provider. Small cells (such as femtocells) also typically cover a relatively small geographic area (e.g., a residential area) and, in addition to unrestricted access, allow restricted access by UEs associated with that femtocell (e.g., UEs in a closed subscriber group (CSG), UEs of users in that residence, etc.). A base station for a macrocell may be referred to as a macro base station. A base station for a small cell may be referred to as a small cell base station, pico base station, femtocell, or home base station. Figure 1 In the example shown, base stations 105d and 105e are conventional macro base stations, while base stations 105a-105c are macro base stations enabled with one of 3D, full-dimensional (FD), or massive MIMO enabled. Base stations 105a-105c utilize their higher-dimensional MIMO capabilities to increase coverage and capacity using 3D beamforming in both elevation and azimuth beamforming. Base station 105f is a small cell base station, which can be a home node or a portable access point. A base station can support one or more (e.g., two, three, four, etc.) cells.

[0067] Wireless Network 100 can support synchronous or asynchronous operation. For synchronous operation, each base station can have similar frame timing, and transmissions from different base stations can be roughly aligned in time. For asynchronous operation, each base station can have different frame timing, and transmissions from different base stations can be misaligned in time. In some scenarios, the network can be implemented or configured to handle dynamic switching between synchronous and asynchronous operation.

[0068] UE 115 is distributed across wireless network 100, and each UE can be stationary or mobile. It should be understood that although mobile devices are generally referred to as User Equipment (UE) in standards and specifications issued by 3GPP, such devices may also be referred to by those skilled in the art as mobile station (MS), subscriber station, mobile unit, subscriber unit, radio unit, remote unit, mobile device, radio device, wireless communication device, remote device, mobile subscriber station, access terminal (AT), mobile terminal, radio terminal, remote terminal, handheld device, terminal, user agent, mobile client, client, gaming device, augmented reality device, vehicle component device / module, or any other suitable term. Within this document, a “mobile” device or UE does not necessarily have mobility capabilities and may be stationary. Some non-limiting examples of mobile devices may include implementations of one or more of the various UEs 115, including mobile stations, cellular phones, smartphones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, laptops, personal computers (PCs), notebooks, netbooks, smartbooks, tablets, and personal digital assistants (PDAs). Mobile devices can also be “Internet of Things” (IoT) or “Internet of Everything” (IoE) devices, such as automobiles or other transportation vehicles, satellite radios, Global Positioning System (GPS) devices, logistics controllers, drones, multi-rotor aircraft, quadcopters, smart energy or security devices, solar panels or solar arrays, urban lighting, water supply or other infrastructure; industrial automation and enterprise equipment; consumer and wearable devices, such as glasses, wearable cameras, smartwatches, health or fitness trackers, mammalian implantable devices, posture tracking devices, medical devices, digital audio players (e.g., MP3 players), cameras, game consoles, etc.; and digital home or smart home devices, such as home audio, video and multimedia equipment, appliances, sensors, vending machines, smart lighting, home security systems, smart meters, etc. In one aspect, a UE can be a device that includes a Universal Integrated Circuit Card (UICC). In another aspect, a UE can be a device that does not include a UICC. In some aspects, a UE that does not include a UICC can also be referred to as an IoE device. Figure 1The UEs 115a-115d described in the text are examples of mobile smartphone-type devices accessing the wireless network 100. The UE can also be a machine specifically configured for connected communications (including machine-type communication (MTC), enhanced MTC (eMTC), narrowband IoT (NB-IoT), etc.). Figure 1 The UE 115e-115k described in the text is an example of various machines configured for accessing communications on the wireless network 100.

[0069] Mobile devices (such as UE 115) can communicate with any type of base station (whether macro base station, pico base station, femto base station, relay, etc.). Figure 1 In this context, a communication link (represented as a lightning bolt) indicates radio transmissions between the UE and a serving base station (a serving base station is a base station designated to serve the UE on the downlink and / or uplink), or desired transmissions between base stations, and backhaul transmissions between base stations. In some scenarios, the UE may operate as a base station or other network node. Backhaul communication between base stations of the wireless network 100 can occur using wired and / or wireless communication links.

[0070] In the operation of wireless network 100, base stations 105a-105c use 3D beamforming and coordinated spatial technologies (such as Coordinated Multipoint (CoMP) or multi-connectivity) to serve UEs 115a and 115b. Macro base station 105d performs backhaul communication with base stations 105a-105c and small cell base station 105f. Macro base station 105d also transmits multicast services subscribed to and received by UEs 115c and 115d. Such multicast services may include mobile television or streaming video, or may include other services for providing community information (such as weather emergencies or alerts, such as Amber Alerts or Grey Alerts).

[0071] The implementation of wireless network 100 supports mission-critical communication with highly reliable and redundant links for mission-critical equipment such as UE 115e, which is a drone. Redundant communication links with UE 115e include those from macro base stations 105d and 105e, and small cell base station 105f. Other machine-type devices (such as UE 115f (thermometer), UE 115g (smart meter), and UE 115h (wearable device)) can communicate directly with base stations (such as small cell base station 105f and macro base station 105e) via wireless network 100, or in a multi-hop configuration via wireless network 100 by communicating with another user equipment relaying its information to the network (e.g., UE 115f relays temperature measurement information to smart meter UE 115g, which is then reported to the network via small cell base station 105f). Wireless network 100 can also provide additional network efficiency through dynamic, low-latency TDD / FDD communication, such as in vehicle-to-vehicle (V2V) mesh networks between UEs 115i-115k communicating with macro base station 105e.

[0072] Figure 2 A block diagram illustrating a conceptual design of base station 105 and UE 115 is shown. Base station 105 and UE 115 can be... Figure 1 Any one of the base stations and one of the UEs. For restricted association scenarios (as mentioned above), base station 105 can be... Figure 1 In the small cell base station 105f, UE 115 can be UE 115c or 115d operating within the service area of ​​base station 105f. To access small cell base station 105f, UE 115 will be included in the list of accessible UEs of small cell base station 105f. Base station 105 can also be some other type of base station. Figure 2 As shown, base station 105 may be equipped with antennas 234a to 234t, and UE 115 may be equipped with antennas 252a to 252r for facilitating wireless communication.

[0073] At base station 105, transmit processor 220 can receive data from data source 212 and control information from controller / processor 240. The control information can be used for Physical Broadcast Channel (PBCH), Physical Control Format Indicator Channel (PCFICH), Physical Hybrid ARQ (Automatic Repeat Request) Indicator Channel (PHICH), Physical Downlink Control Channel (PDCCH), Enhanced Physical Downlink Control Channel (EPDCCH), MTC Physical Downlink Control Channel (MPDCCH), etc. This data can also be used for Physical Data Sharing Channel (PDSCH), etc. Additionally, transmit processor 220 can process (e.g., encode and map symbol) the data and control information to obtain data symbols and control symbols respectively. Transmit processor 220 can also generate reference symbols, for example, for primary synchronization signal (PSS) and secondary synchronization signal (SSS), and reference signals that vary depending on the cell. The transmit (TX) multiple-input multiple-output (MIMO) processor 230 can perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, and / or reference symbols where applicable, and can provide the output symbol stream to modulators (MODs) 232a to 232t. For example, spatial processing performed on data symbols, control symbols, or reference symbols may include precoding. Each modulator 232 can process its respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 can additionally or alternatively process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The downlink signal from modulators 232a to 232t can be transmitted via antennas 234a to 234t, respectively.

[0074] At UE 115, antennas 252a to 252r can receive downlink signals from base station 105 and can respectively provide the received signals to demodulators (DEMODs) 254a to 254r. Each demodulator 254 can condition (e.g., filter, amplify, downconvert, and digitize) its respective received signal to obtain an input sample. Each demodulator 254 can further process the input sample (e.g., for OFDM, etc.) to obtain received symbols. MIMO detector 256 can obtain the received symbols from demodulators 254a to 254r, perform MIMO detection on these received symbols where applicable, and provide detected symbols. Receiver processor 258 can process (e.g., demodulate, deinterleave, and decode) these detected symbols, provide the decoded data to UE 115 to data sink 260, and provide the decoded control information to controller / processor 280.

[0075] On the uplink, at UE 115, transmit processor 264 can receive and process data from data source 262 (e.g., data for the Physical Uplink Shared Channel (PUSCH)) and control information from controller / processor 280 (e.g., control information for the Physical Uplink Control Channel (PUCCH)). Additionally, transmit processor 264 can also generate reference symbols for reference signals. Symbols from transmit processor 264 can be pre-encoded by TX MIMO processor 266, further processed by modulators 254a to 254r (e.g., for SC-FDM, etc.), and transmitted to base station 105, where applicable. At base station 105, uplink signals from UE 115 can be received by antenna 234, processed by demodulator 232, detected by MIMO detector 236, and further processed by receive processor 238 to obtain decoded data and control information transmitted by UE 115. Processor 238 can provide decoded data to data trap 239 and decoded control information to controller / processor 240.

[0076] Controllers / processors 240 and 280 can respectively direct operations at base station 105 and UE 115. Controllers / processors 240 and / or other processors and modules at base station 105 and / or controllers / processors 280 and / or other processors and modules at UE 115 can perform or direct the execution of various processes used in the techniques described herein, such as performing or directing... Figure 4 and Figure 5 The execution and / or other processes used in the techniques described herein are as explained herein. Memory 242 and 282 may store data and program code for base station 105 and UE 115, respectively. Scheduler 244 may schedule the UE for data transmission on downlink and / or uplink.

[0077] The devices of the wireless network 100 (such as base station 105 and / or UE 115) can be configured for beamforming, such as providing a highly directional beam (also referred to as antenna beam, radiation pattern, and main lobe) relative to the wireless communication link used. For example, base station 105 and UE 115 can be configured for robust mmWave transmission, such as for providing high data rate communication. Accordingly, the radio frequency (RF) transceiver components of the base station 105 (e.g., transmit processor 220, TX MIMO processor 230, antennas 234a-234t, MOD / DEMOD 232a-232t, MIMO detector 236, and / or receive processor 238) and / or the RF transceiver components of the UE 115 (e.g., antennas 252a-252r, MOD / DEMOD 254a-254r, MIMO detector 256, receive processor 258, transmit processor 264, and / or TX MIMO processor 266) of each embodiment can be configured for operation relative to mmWave communication. The embodiments of the base station 105 and UE 115 configured for mmWave communication can, for example, implement massive MIMO antenna functionality to provide beamforming for highly directional beams to cope with increased path loss and facilitate line-of-sight communication.

[0078] Using highly directional beams (as associated with the mmWave wireless communication links mentioned above) can lead to challenges in establishing and maintaining wireless communication links. For example, while directional beams offer advantages in terms of signal gain and interference avoidance when properly directed at the corresponding communication device (e.g., illuminating the intended corresponding wireless node), they typically provide a relatively small coverage area. Mobile devices may quickly and often unintentionally exit the coverage area of ​​a highly directional beam. Furthermore, because mmWave signals inherently provide the propagation characteristics of line-of-sight communication links (e.g., diffraction and reflection of the propagated signal are less pronounced relative to most materials), signal blockage associated with shading and fading can be much more pronounced than the signal blockage experienced at lower frequencies relative to typical cellular communication. Accordingly, the communication devices of the wireless network 100 (e.g., base station 105 and / or UE 115) can implement beam fault recovery (BFR) procedures.

[0079] For example, a BFR procedure can implement the detection of beam faults, the transmission of beam fault recovery requests, the response to beam fault recovery requests, the identification of new beam candidates, and the process of establishing a new beam upon completion of recovery. For instance, according to a contention-free random access (CFRA) based BFR procedure, UE 115 can transmit a BFR request signal (e.g., a random access channel (RACH) preamble for BFR) in response to the detection of a beam fault. Subsequently, the UE can monitor the PDCCH within a random access response (RAR) window (e.g., a ra-ResponseWindow) to look for signals addressed to the C-RNTI (Cellular Radio Network Temporary Identifier) ​​(e.g., a Media Access Control (MAC) Protocol Data Unit (PDU)). However, challenges may exist regarding the timing of initiating beam fault recovery and the waiting time experienced during beam fault recovery completion.

[0080] The UE can implement a discontinuous reception (DRX) mode to attempt to reduce UE power consumption. When operating according to DRX mode, the UE enters a sleep mode for a specific period and wakes up for another period. During the wake-up period in the DRX cycle, the UE monitors UE-related signals (e.g., paging signals, data transmission signals, etc.). Because the UE's state information may become outdated during the sleep period in the DRX cycle, the UE can perform various operations (e.g., automatic gain control (AGC), time tracking loop (TTL), frequency tracking loop (FTL), channel estimation, etc.) when it exits sleep mode. Performing such a wake-up (WU) process often consumes a significant amount of power, and therefore performing the WU process according to the schedule when no data is actually being received may unnecessarily waste UE power and shorten UE battery life. Accordingly, the UE can be configured for wake-up signal (WUS) monitoring associated with DRX mode operation. By using WUS-triggered DRX monitoring, whether the UE wakes up (e.g., performs a WU phase operation) during the on-time period is conditional upon detecting WUS. The implementation of WUS-triggered DRX mode can therefore avoid executing the WU procedure when there is actually no data to be received by the UE.

[0081] like Figure 3 As explained, BFR may be triggered outside the active time of DRX mode, which could lead to a delay in beam fault recovery. Figure 3In the example, a WUS-triggered DRX mode is implemented where, when the UE detects a WUS timing of a DRX cycle (e.g., WUS timing 301a or 301b), the UE 115 is active during the on-time of the corresponding DRX cycle (e.g., on-time 302a or 302b). However, processing according to CFRA-based BFR procedures (e.g., transmitting a RACH preamble for BFR when a BFR request signal transmission occurs (311), and performing PDCCH monitoring within the RAR 312 window) may occur outside the DRX active time (e.g., on-time 302a and 302b). For example, the UE 115 may detect a beam fault between the end of the active time associated with on-time 302a and the transmission of a BFR request signal when a BFR request signal transmission occurs (311), where the CFRA-based BFR procedure processing is initiated outside the DRX active time (e.g., on-time 302a and 302b). In a scenario where there is a waiting period between the detection of a beam fault and the initiation of a CFRA-based BFR procedure, UE115 can detect the beam fault during the active period associated with the on-time duration 302a, and the CFRA-based BFR procedure processing can still be initiated outside the DRX active period.

[0082] Although the RACH procedure for BFR can be considered successfully completed upon detection of a PDCCH addressed to C-RNTI, the CFRA-based BFR procedure may not complete within the RAR window, even when a PDCCH addressed to C-RNTI is detected. For example, the CFRA-based BFR procedure can implement further signaling to complete the BFR. UE 115 can receive BFR-related signaling (such as PDCCH Transmission Configuration Indicator (TCI) state activation MAC control element (CE), PDSCH TCI state activation MAC CE, (e.g.) PUCCH / SRS (Probe Reference Signal) spatial relationship activation MAC CE, Path Loss (PL) Reference Signal (RS) update MAC CE, Radio Resource Control (RRC) reconfiguration for P-CSI-RS (Periodic Channel State Information Reference Signal), etc.) to complete the BFR. Such BFR-related signaling (such as signaling that can be used when updating the beam at the UE) may not complete within the RAR window. For example, there may be interference and / or other obstacles to signal reception, in which retransmission may be available (e.g., according to the Hybrid Automatic Repeat Request (HARQ) procedure), which may not be completed within the time of the RAR window.

[0083] As should be understood from the above, there may be scenarios where BFR-related signaling is not completed within the RAR window and the UE may still need to receive further information outside the RAR window time (e.g., from base station 105) to complete BFR. In operation according to existing 5G NR protocols, the RAR window (e.g., ra-ResponseWindow) is not considered a DRX active time. Furthermore, according to existing 5G NR protocols, there is no "random access response" for BFR (e.g., any instance of a PDCCH addressed to C-RNTI detected during the RAR window after the transmission of the RACH preamble for BFR can complete the RACH procedure). Therefore, for BFR, signals addressed to C-RNTI received during the RAR window (e.g., RAR window 312) outside the DRX active time (e.g., MAC PDUs scheduled by the PDCCH addressed to C-RNTI) will not trigger any active time for the DRX mode. For example, under existing 5G NR protocols, the DRX inactivity timer, round-trip time (RTT) timer, and retransmission (re-Tx) timer are triggered only when a MAC PDU is received during DRX active time or by a MAC PDU received / transmitted according to SPS / CG (Semi-Persistent Scheduling Configuration Grant). Conversely, for CFRA except for BFR, the DRX active time follows RAR reception.

[0084] In scenarios where the BFR is triggered outside the DRX active time and the UE may need to receive further information outside the RAR window time to complete the BFR, the RAR window will not be extended according to DRX mode operation (e.g., via DRX inactivity / retransmission timers). The opportunity for the UE to receive further information from the base station is constrained by the RAR window and the active time of subsequent DRX cycles (e.g., the duration of the next DRX cycle's start). Figure 3In the example, if UE 115 implementing the CFRA-based BFR procedure fails to successfully receive the BFR-related signaling for completing the BFR within RAR window 312, the next potential opportunity to receive the BFR-related signaling will occur during the opening duration 302b of the next DRX cycle. Given that the BFR procedure has been triggered outside the DRX active time, this DRX active time may not immediately follow RAR window 312 (e.g., it may be initiated only after the inactive period between the end of RAR window 312 and the start of opening duration 302b). HARQ retransmission may be interrupted when the UE fails to receive / transmit a MAC PDU. Additionally or alternatively, the UE may need to receive other BFR-related signaling from the network (e.g., PDCCH TCI state activation MAC CE, PDSCH TCI state activation MAC CE, PUCCH / SRS spatial relationship activation MAC CE, PL RS update MAC CE, RRC reconfiguration for P-CSI-RS, etc.) to complete the BFR procedure. If these cannot be completed in close proximity to the triggering of BFR, performance (e.g., BFR procedure performance, communication performance dependent on associated beams, etc.) may be adversely affected.

[0085] If the UE is configured with WUS monitoring, the aforementioned issues regarding the completion of the BFR procedure may become more complicated. For example, the beam used for WUS may not be updated immediately after BFR is triggered. Consequently, even if the base station transmits WUS, the UE may fail to receive WUS for the next DRX cycle, and the DRX active time for one or more subsequent DRX cycles (e.g., start duration 302b) may never begin.

[0086] Potential implementation-based solutions for facilitating the completion of CFRA-based BFR procedures could include configuring the UE so that it triggers BFR only during DRX active periods. While such a solution may work well without WUS configured (e.g., the UE is implementing legacy DRX mode), it may not be particularly suitable for use in scenarios where the UE is configured for WUS. For example, if WUS is configured, the UE cannot autonomously begin its on-duration period (e.g., start the drx-onDurationTimer), and therefore the UE will wait until WUS triggers the DRX active period. However, as mentioned above, once a beam fault is detected, the UE may be unable to receive WUS, and thus initiating the DRX active period may become problematic. Similarly, any solution that relies on a UE configured with WUS continuing to centrally monitor the PDCCH in the BFR search space (e.g., frequency resources, time resources, beam configuration, spatial filters, etc.) during subsequent DRX on-duration periods may encounter issues regarding the UE's inability to autonomously begin its on-duration period.

[0087] Another potential implementation-based solution for facilitating the completion of CFRA-based BFR procedures could be configuring the UE with a very long RAR window (e.g., up to 10 ms for licensed band operation and up to 40 ms for unlicensed band operation, according to current protocols). For example, after monitoring a MAC PDU addressed to a C-RNTI in the PDCCH, the UE could continue to monitor the C-RNTI centrally within the BFR search space for the remainder of the RAR window. However, the RAR window configuration is network-dependent (e.g., the network operator associated with the specific base station communicating with the UE). Various networks can be configured for relatively short RAR windows for any number of reasons. Therefore, solutions relying on RAR window configurations may provide inconsistencies, unpredictability, and other unsatisfactory operations regarding the completion of CFRA-based BFR procedures.

[0088] Implementations of aspects of this disclosure are provided, along with techniques for BFR operation in DRX mode with WUS monitoring. According to aspects of this disclosure, DRX mode operation can be modified based on a CFRA-based BFR procedure implemented by the UE. For example, DRX mode operation can be modified to allow the UE to begin DRX active time after triggering a BFR procedure by transmitting a BFR request signal. In another example, DRX mode operation can be modified to allow the UE to start an on-time timer for the next DRX cycle after triggering a BFR procedure by transmitting a BFR request signal. In yet another example, DRX mode operation can be modified to allow the UE to monitor the BFR search space set regardless of the DRX state after triggering a BFR procedure by transmitting a BFR request signal.

[0089] Figure 4 An example flow is shown that provides functionality, invoked by the UE, for altering DRX mode operation according to a CFRA-based BFR procedure implemented by the UE. For example, the functionality of flow 400 could be utilized regarding beam fault recovery initiated, triggered, or otherwise implemented outside of DRX mode active time. According to some aspects of this disclosure, Figure 4 The process 400 described herein may, for example, be implemented as part of a procedure for UE 115 to recover after a beam failure. In some implementations, according to the concepts of this disclosure, process 400 includes various functionalities that facilitate BFR completion, such as those that can be executed by the logic of an embodiment of UE 115 (e.g., the logic circuitry of the controller / processor 280), regardless of whether the beam failure is detected within or outside the DRX active time.

[0090] In the operation of flow 400 according to the illustrated embodiment, a beam fault is detected at block 401 by the UE operating according to DRX mode. For example, a beam fault regarding control information and / or application data channels can be detected. According to some aspects, a communication fault can be detected by the UE 115, such as reporting a failure to recover data to the controller / processor 280 via the receive processor 258, an unacceptably high bit error rate (BER) regarding received data, etc., wherein the logic of the controller / processor 280 determines that a beam fault has occurred. As referenced above Figure 3 In some examples discussed, UE 115 can detect beam faults between the end of the active period associated with the onset duration and the transmission of the BFR request signal, where CFRA-based BFR procedure processing is initiated outside the DRX active period. See also the reference above. Figure 3 In some of the examples discussed, UE 115 can detect beam faults during the active period associated with the activation duration, and CFRA-based BFR procedure processing can still be initiated outside the DRX active period.

[0091] Although the operation of the illustrated example's procedure 400 facilitates BFR completion in a scenario where CFRA-based BFR procedure processing is initiated outside of DRX active time, the functionality of the illustrated procedure can still be performed according to some aspects of this disclosure regardless of whether the CFRA-based BFR procedure processing is initiated within or outside of DRX active time. Accordingly, in some examples, UE 115 can detect beam faults during DRX active time (e.g., on-duration), where CFRA-based BFR procedure processing is initiated within DRX active time.

[0092] In block 402, a BFR request signal is transmitted according to a CFRA-based BFR procedure implemented by the UE in response to the detection of a beam fault. For example, CFRA-based BFR procedure processing may be initiated, in which the RF transceiver components of UE 115 (e.g., antennas 252a-252r, MOD / DEMOD 254a-254r, MIMO detector 256, receive processor 258, transmit processor 264, and / or TX MIMO processor 266) transmit the BFR request signal. According to some aspects of this disclosure, the BFR request signal may include a RACH preamble and associated messages of the CFRA-based BFR procedure. The BFR request signal may provide an indication of a beam fault, information about new candidate beam configurations for further communication with the UE, etc.

[0093] In block 403, DRX mode operation is modified according to a CFRA-based BFR procedure implemented by the UE. For example, according to various aspects of this disclosure, the DRX control logic of UE 115 can modify DRX mode operation in one or more ways according to a CFRA-based BFR procedure to facilitate BFR completion and recovery after a beam failure. For example, the DRX control logic may include code (e.g., software, firmware, executable instructions, and / or other code elements) stored in memory 282 that provides the functionality described herein when executed by a processor (e.g., controller / processor 280).

[0094] According to some aspects of this disclosure, changing DRX mode operation may include initiating a DRX active time. For example, DRX mode operation may be changed to allow UE 115 to initiate a DRX active time after transmitting a RACH for BFR (e.g., after triggering a BFR procedure by transmitting a RACH for BFR) or after receiving a PDCCH addressed to a C-RNTI in response to a RACH transmission for BFR, whether within or outside the DRX active time. In operation according to some examples, a DRX timer may be triggered based on the UE receiving a PDCCH of a scheduled MAC PDU according to a CFRA-based BFR procedure, regardless of whether the UE is operating within the active time of the DRX mode when it receives the PDCCH of the scheduled MAC PDU. A DRX timer triggered based on the UE receiving a PDCCH of a scheduled MAC PDU may, for example, include an inactivity timer, an RTT, and / or a retransmission timer. For example, in operation concerning a new transmission, a DRX inactivity timer may be triggered, while in operation concerning a retransmission, an RTT timer and / or a retransmission timer may be triggered. Therefore, according to some aspects of this disclosure, by receiving a PDCCH addressed to C-RNTI during the RAR window after the RACH used for BFR, the UE can enter the DRX active period by starting an inactivity timer, an RTT timer, and / or a retransmission timer. The DRX active period can extend beyond the RAR window period and can be further extended by BFR procedural activities (e.g., triggering further signaling for completing BFR, HARQ retransmission, etc., that trigger the DRX timer).

[0095] According to another example, DRX mode operation can be modified so that the DRX active time includes BFR procedural activities performed by the UE. For example, the DRX active time can be extended to include BFR scenarios. In this scenario, various BFR procedural activities within the RAR window (e.g., BFR request signal transmission, receiving a PDCCH addressed to C-RNTI, receiving further signaling for BFR completion, HARQ retransmission, etc.) can trigger DRX timers (e.g., inactivity timers, RTT timers, and / or retransmission timers) and provide DRX active time for BFR completion outside the RAR window period. As in the earlier example above, the DRX active time can be extended beyond the RAR window period and can be further extended by BFR procedural activities (e.g., further signaling for BFR completion that triggers DRX timers, HARQ retransmission, etc.).

[0096] According to some aspects of this disclosure, in an example where the DRX mode includes a WUS-triggered DRX mode, changing the DRX mode operation may include: after the BFR procedure is triggered by the UE transmitting a BFR request signal, changing the spatial filter (e.g., beam configuration) used to receive the WUS for one or more subsequent DRX cycles (e.g., the next DRX cycle and / or subsequent DRX cycles). Accordingly, the DRX mode operation may be changed to induce the UE to start an on-timer for the next DRX cycle after transmitting a RACH for BFR. The spatial filter used to receive the WUS (e.g., in cases where the WUS is not shared by a group of UEs) may, for example, be changed using the quasi-co-location (QCL) assumption of the candidate beams of the CFRA-based BFR procedure. According to some aspects of this disclosure, for the WUS, an assumption may be made with the BFR candidate beam q 新 (For example, the same beam used to monitor the BFR search space set) the same QCL. The UE can use a new beam (e.g., q) after the RACH used for BFR. 新 The UE can receive WUS for the next (or subsequent) DRX cycle, whereby the UE can continue to receive MAC CE for beam updates during the active time of the next DRX cycle.

[0097] According to another example, DRX mode operation can be modified to allow a second (e.g., fallback) resource configuration for WUS to be used. Depending on some aspects, the second WUS resource configuration (e.g., fallback control resource set, search space set, and / or downlink control information format) (if configured) can be used after BFR is triggered. WUS can be configured to be monitored within a BFR search space set (e.g., depending on the UE). The UE can assume a match between the second beam configuration used for WUS and the candidate beam q. 新 Same QCL.

[0098] According to some aspects of this disclosure, modifying DRX mode operation with respect to WUS-triggered DRX mode may include: adopting non-WUS-triggered DRX mode operation, in which one or more subsequent DRX cycles (e.g., the next DRX cycle and / or subsequent DRX cycles) are initiated after transmitting a BFR request signal, whether or not the UE receives WUS. For example, WUS-triggered DRX mode may be reset to DRX mode operation that does not utilize WUS to trigger the start-up duration (e.g., legacy DRX mode) after triggering BFR (e.g., after the UE transmits a BFR request signal). According to some aspects of this disclosure, WUS configuration (e.g., in cases where the UE is configured for WUS-triggered DRX mode) may be discarded or temporarily disabled (e.g., until a TCI state update), wherein the UE reverts to legacy DRX operation (e.g., the UE does not need to monitor WUS and operates to start the DRX start-up duration timer in subsequent DRX cycles regardless of WUS).

[0099] Modifying DRX mode operation in several ways may include having the UE monitor the BFR search space set after a BFR procedure is triggered by transmitting a BFR request signal, regardless of whether the UE is operating during the active time of DRX mode. For example, DRX mode operation may be modified to allow UE 115 to monitor the BFR search space set regardless of the DRX state. According to some aspects of this disclosure, the UE may be able to monitor the BFR search space set after a BFR procedure is triggered by transmitting a BFR request signal (e.g., RACH for CFRA-based BFR), regardless of whether the UE is operating during the RAR window period and / or the active time of WUS-triggered DRX mode. For example, regardless of the DRX state and RAR window, the UE may continue to monitor the BFR search space to facilitate BFR completion (e.g., performing BFR procedure activities that trigger DRX timers, such as signaling for BFR completion, HARQ retransmission, etc.).

[0100] Figure 5 An example flow is shown that provides functionality, invoked by the base station, for altering DRX mode operation according to a CFRA-based BFR procedure implemented by the UE. For example, the functionality of flow 500 may be utilized with respect to a BFR initiated, triggered, or otherwise implemented outside of DRX mode active time. According to some aspects of this disclosure, Figure 5The process 500 described herein can, for example, be implemented as part of a procedure for recovery after a beam failure. In some implementations, according to the concepts of this disclosure, process 500 includes various functionalities that facilitate BFR completion, such as those executable by the logic of an embodiment of base station 105 (e.g., the logic circuitry of controller / processor 240), regardless of whether the beam failure is detected and / or initiated within or outside the DRX active time.

[0101] In the operation of flow 500 according to the illustrated embodiment, at block 501, a BFR request signal is received according to a CFRA-based BFR procedure implemented by the UE. For example, CFRA-based BFR procedure processing can be initiated, wherein the RF transceiver components of base station 105 (e.g., antennas 234a-234t, MOD / DEMOD 232a-232r, MIMO detector 236, receive processor 238, transmit processor 220, and / or TX MIMO processor 230) receive the BFR request signal. According to some aspects of this disclosure, the BFR request signal may include a RACH preamble and associated messages of the CFRA-based BFR procedure. The BFR request signal may provide an indication of a beam fault, information about beam configuration for further communication with the UE, etc. The BFR request signal may be provided in association with a beam fault detected by a UE operating according to DRX mode. In some examples, the BFR request signal may be received in association with a UE initiating BFR procedure processing outside of DRX active time. According to some examples, a BFR request signal can be received in association with a BFR procedure initiated by the UE during DRX active time.

[0102] In block 502, DRX mode operation is modified according to a CFRA-based BFR procedure implemented by the UE. For example, according to various aspects of this disclosure, the DRX control logic of base station 105 can modify DRX mode operation in one or more ways according to a CFRA-based BFR procedure to facilitate BFR completion and recovery after a beam failure of the UE. For example, the DRX control logic may include code (e.g., software, firmware, executable instructions, and / or other code elements) stored in memory 240 that provides the functionality described herein when executed by a processor (e.g., controller / processor 240).

[0103] According to some aspects of the DRX mode included in this disclosure, such as a WUS-triggered DRX mode, changing the DRX mode operation may include: according to some aspects of this disclosure, after triggering a BFR procedure by transmitting a BFR request signal via the UE, reconfiguring the beam used for the WUS for the next DRX cycle. Accordingly, the DRX mode operation may be changed to cause the UE to start an on-time timer for the next DRX cycle after transmitting a RACH for BFR. The beam used for the WUS (e.g., in cases where the WUS is not shared by a group of UEs) may be reconfigured, for example, using the QCL of a candidate beam in a CFRA-based BFR procedure. According to some aspects of this disclosure, for the WUS, it may be assumed that the BFR candidate beam q 新 The same QCL. The network (e.g., base station 105) can use a new beam (e.g., q) after the RACH used for BFR. 新 This is used to transmit WUS for the next (or subsequent) DRX cycle, where the UE can continue to receive MAC CE for beam updates during the active time of the next DRX cycle.

[0104] Depending on some aspects, a second (e.g., fallback) WUS configuration (if configured) can be used after receiving a BFR request signal. The WUS can be configured to be monitored within a BFR search space set (e.g., depending on the UE). The UE can assume a match between the second beam configuration used for the WUS and the candidate beam q. 新 Same QCL.

[0105] In operation according to some aspects of this disclosure, the wireless device may choose to implement a specific technique or a specific combination of techniques for changing DRX mode operation. For example, one or a combination of the techniques mentioned above (involving initiating DRX active time, changing the spatial filter used to receive WUS, adopting a non-WUS-triggered DRX mode, or monitoring the BFR search space regardless of the DRX mode active mode) may be selected by the UE depending on explicit or implicit configuration, operating rules, etc. According to some aspects, the choice between implementing a technique involving adopting a non-WUS-triggered DRX mode and implementing a technique involving monitoring the BFR search space regardless of the DRX mode active time may depend on other WUS-related configuration attributes. In one example, if WUS is not configured (e.g., non-WUS-triggered DRX mode), the UE may choose not to implement any technique for changing DRX mode operation (e.g., the UE may instead utilize one or more of the implementation-based solutions described above). In another example, if WUS is configured (e.g., WUS-triggered DRX mode), the UE can choose to implement either a technique involving a non-WUS-triggered DRX mode or a technique involving monitoring the BFR search space regardless of DRX mode active time (e.g., based on one or more other WUS configuration parameters, such as ps-Wakeup). According to some aspects, "ps-Wakeup" is a higher-level parameter indicating whether the UE should trigger a DRX start-up duration timer when no WUS is received. According to some examples of techniques for changing DRX mode operation, if ps-Wakeup = true, the UE can choose to implement a technique involving a non-WUS-triggered DRX mode; otherwise, the UE can choose to implement a technique involving monitoring the BFR search space regardless of DRX mode active time.

[0106] Although examples of BFR operation for DRX mode with WUS monitoring have been described herein, it should be understood that some aspects of this disclosure can be implemented in relation to BFR procedures with or without WUS monitoring. For example, some aspects of this disclosure can be implemented with respect to BFR procedures that are not WUS-triggered. Additionally or alternatively, some aspects of this disclosure can be implemented with respect to BFR procedures other than CFRA-based BFR procedures.

[0107] Figure 6 A block diagram illustrating a UE 115 configured according to one aspect of this disclosure is shown. UE 115 includes, as per [specification], [details]. Figure 2The structure, hardware, and components described in UE 115. For example, UE 115 includes a controller / processor 280, which operates to execute logical or computer instructions stored in memory 282, and various components that control UE 115 and provide the features and functionality of UE 115. Under the control of controller / processor 280, UE 115 transmits and receives signals via wireless radio 601a-r and antenna 252a-r. Wireless radio 601a-r includes various components and hardware, such as... Figure 2 The description of UE115 includes modulator / demodulator 254a-r, MIMO detector 256, receiver processor 258, transmitter processor 264, and TX MIMO processor 266.

[0108] exist Figure 6 In the example, UE 115 includes BFR procedure logic 602, which may include logic for detecting beam faults and / or for performing beam fault recovery processing. BFR procedure logic 602 may, for example, perform the above-mentioned... Figure 4 The functions discussed in process 400 are for detecting beam faults, initiating beam fault recovery, and completing beam fault recovery.

[0109] Figure 6 The UE 115 shown further includes DRX control logic 603, which may include logic for changing the DRX mode operation of the UE. The DRX control logic 603 may, for example, perform the operations described above. Figure 4 The process 400 discusses the functionality for changing DRX mode operation according to the CFRA-based BFR procedure implemented by the UE.

[0110] Figure 7 A block diagram illustrating a base station 105 configured according to one aspect of this disclosure is shown. Base station 105 includes components as described for... Figure 2 The base station 105 is described in the following description: its structure, hardware, and components. For example, base station 105 includes a controller / processor 240, which operates to execute logical or computer instructions stored in memory 242, and various components that control base station 105 and provide the characteristics and functionality of base station 105. Under the control of controller / processor 240, base station 105 transmits and receives signals via wireless radio 701a-t and antenna 234a-t. Wireless radio 701a-t includes various components and hardware (such as in...). Figure 2 (As explained in the text for base station 105), it includes modulator / demodulator 232a-t, MIMO detector 236, receiver processor 238, transmitter processor 220, and TX MIMO processor 230.

[0111] exist Figure 7In the example, base station 105 includes BFR procedure logic 702, which may include logic for cooperating with the UE to perform beam fault recovery processing. BFR procedure logic 702 may, for example, perform the above-mentioned... Figure 4 The function discussed in process 400 is for receiving BFR request signals in association with beam fault recovery initiated by the UE.

[0112] Figure 7 The base station 105 shown further includes DRX control logic 703, which may include logic for changing the DRX mode operation of the base station. The DRX control logic 703 may, for example, perform the operations described above. Figure 5 The process 500 discusses the functionality for changing DRX mode operation according to the CFRA-based BFR procedure implemented by the UE.

[0113] In some examples of the methods, apparatuses, and articles of art including non-transient computer-readable media described herein, the alteration of various aspects of DRX mode operation according to a CFRA-based BFR procedure implemented by the UE can be achieved through a variety of combinations consistent with the concepts described herein. Non-limiting examples of combinations of aspects of multi-slot transport block technology are illustrated in the example clauses below.

[0114] 1. A method, apparatus, and article of manufacture for wireless communication may provide: detection of a beam fault by a UE operating in DRX mode; transmission of a BFR request signal according to a CFRA-based BFR procedure implemented by the UE in response to the detection of the beam fault; and modification of DRX mode operation based on the CFRA-based BFR procedure implemented by the UE.

[0115] 2. The method, apparatus, and article of manufacture as described in Clause 1, wherein the BFR request signal includes a RACH preamble and an associated message of the CFRA-based BFR procedure.

[0116] 3. Methods, apparatus and articles of manufacture as described in any of Clauses 1-2, wherein changing DRX mode operation provides: initiation of DRX active time.

[0117] 4. The method, apparatus, and article of Article 3, wherein the start of DRX active time is provided by: triggering a DRX timer based on the UE receiving a PDCCH of a scheduling MAC PDU according to a CFRA-based BFR procedure, regardless of whether the UE is operating within the active time of the DRX mode when it receives the PDCCH of the scheduling MAC PDU.

[0118] 5. The method, apparatus, and article of manufacture of any of the provisions 3-4, wherein the DRX timer includes an inactive timer, an RTT timer, and / or a retransmission timer.

[0119] 6. The method, apparatus, and article of any of Clauses 3-5, wherein the DRX active time includes the definition of the DRX mode as including the active time of BFR procedural activities performed by the UE.

[0120] 7. The method, apparatus, and article of any of the provisions 1-6, wherein the DRX mode is a WUS-triggered DRX mode.

[0121] 8. The method, apparatus and article of manufacture as described in Clause 7, wherein the change DRX mode operation provides: centralized monitoring of the WUS in the BFR search space at least for the next DRX cycle after the UE transmits the BFR request signal.

[0122] 9. The method, apparatus, and article of any of Clauses 7-8, wherein the change DRX mode operation provides: after the UE transmits the BFR request signal, a change is made to the spatial filter of the WUS used to receive at least for the next DRX cycle.

[0123] 10. The method, apparatus and article of manufacture as described in Clause 9, wherein the spatial filter used to receive the WUS is modified to provide: QCL assumptions for candidate beams based on the CFRA-based BFR procedure are used for the spatial filter used to receive the WUS.

[0124] 11. The method, apparatus, and article of any of Clauses 9-10, wherein the spatial filter used to receive the WUS is modified to provide: a second resource configuration for the WUS is used, wherein the second resource configuration for the WUS is different from the first WUS resource configuration used before the beam fault was detected.

[0125] 12. The method, apparatus, and article of manufacture as described in Clause 11, wherein the second resource configuration for the WUS includes at least one of a control resource set, a search space set, or a downlink control information format.

[0126] 13. Methods, apparatus and articles of manufacture as described in Clause 12, wherein the search space set used for the WUS is a BFR search space set associated with a CFRA-based BFR protocol.

[0127] 14. The method, apparatus and article of manufacture as described in Clause 7, wherein the change of DRX mode operation provides: employing a non-WUS-triggered DRX mode operation, in which the next DRX cycle is initiated after transmitting the BFR request signal, whether or not the UE receives the WUS.

[0128] 15. The method, apparatus, and article of manufacture of any of Clauses 1-14, wherein changing DRX mode operation provides that: after transmitting the BFR request signal, the UE monitors the BFR search space set regardless of whether the UE is operating during the active time of the DRX mode.

[0129] 16. The method, apparatus, and article of manufacture as described in Clause 15, wherein the BFR search space set is provided by the UE after the BFR request signal is transmitted: the BFR search space set is provided by the UE regardless of whether the UE is operating within a RAR window of a CFRA-based BFR procedure.

[0130] 17. The methods, apparatus and articles of manufacture of any of the provisions 1-16 further provide: a specific technique or a specific combination of techniques for changing DRX mode operation to be implemented by the UE.

[0131] 18. Methods, apparatus and articles of manufacture as described in Clause 17, wherein the selection of a particular technique or combination of techniques for altering DRX mode operation is based at least in part on configuration parameters or operating rules.

[0132] 19. Methods, apparatus, and articles of manufacture for wireless communication may provide: receiving a BFR request signal according to a CFRA-based BFR procedure implemented by a UE, wherein the BFR request signal is provided in association with a beam fault detected by a UE operating in DRX mode, and changing DRX mode operation based on the CFRA-based BFR procedure implemented by the UE.

[0133] 20. Methods, apparatus and articles of manufacture as described in Clause 19, wherein the DRX mode includes a WUS-triggered DRX mode.

[0134] 21. The method, apparatus, and article of manufacture as described in Clause 20, wherein the change of DRX mode operation is provided by: changing the spatial filter of WUS used at least for the next DRX cycle after receiving the BFR request signal.

[0135] 22. The method, apparatus and article of manufacture as described in Clause 21, wherein the modification to the spatial filter used to receive the WUS is provided by: using a QCL assumption for a candidate beam based on a CFRA-based BFR protocol for the spatial filter used to receive the WUS.

[0136] 23. The method, apparatus and article of manufacture as described in Clause 21, wherein the change provided by the spatial filter used for the WUS is: using a second resource configuration for the WUS, wherein the second resource configuration for the WUS is different from the first WUS resource configuration used before the beam fault was detected.

[0137] 24. The method, apparatus, and article of manufacture as described in Clause 23, wherein the second resource configuration for the WUS includes at least one of a control resource set, a search space set, or a downlink control information format.

[0138] 25. Methods, apparatus and articles of manufacture as described in Clause 24, wherein the search space set used for the WUS is a BFR search space set associated with a CFRA-based BFR protocol.

[0139] Those skilled in the art will understand that information and signals can be represented using any of a variety of different techniques and skills. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout the above description can be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or light particles, or any combination thereof.

[0140] The components, functional blocks, and modules described in this document (e.g., Figure 2 The components, functional blocks, and modules (in this document) may include processors, electronic devices, hardware devices, electronic components, logic circuits, memory, software code, firmware code, etc., or any combination thereof. Furthermore, the features discussed herein related to BFR operation for DRX mode may be implemented via dedicated processor circuitry, via executable instructions, and / or a combination thereof.

[0141] Those skilled in the art will further appreciate that, in conjunction with the various illustrative logic blocks, modules, circuits, and algorithmic steps disclosed herein (e.g., Figure 4 and 5 The logic blocks (in this document) can be implemented as electronic hardware, computer software, or a combination of both. To clearly illustrate this interchangeability between hardware and software, various illustrative components, blocks, modules, circuits, and steps are described above in a generalized manner in terms of their functionality. Whether such functionality is implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system. Those skilled in the art may implement the described functionality in different ways for each specific application, but such implementation decisions should not be construed as departing from the scope of this disclosure. Those skilled in the art will also readily recognize that the order or combination of components, methods, or interactions described herein are merely illustrative and that components, methods, or interactions of various aspects of this disclosure may be combined or performed in ways other than those described and illustrated herein.

[0142] The various illustrative logic blocks, modules, and circuits described herein can be implemented or executed using a general-purpose processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described herein. The general-purpose processor may be a microprocessor, but in alternatives, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors cooperating with a DSP core, or any other such configuration.

[0143] The steps of the methods or algorithms described herein can be implemented directly in hardware, in a software module executed by a processor, or a combination of both. The software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to a processor so that the processor can read and write information from / to the storage medium. In an alternative, the storage medium may be integrated into the processor. The processor and storage medium may reside in an ASIC. The ASIC may reside in a user terminal. In an alternative, the processor and storage medium may reside as discrete components in the user terminal.

[0144] In one or more exemplary designs, the described functionality can be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functionality can be stored or transmitted as one or more instructions or code on or through a computer-readable medium. A computer-readable medium includes both computer storage media and communication media, including any medium that facilitates the transfer of a computer program from one location to another. A computer-readable storage medium can be any available medium accessible to a general-purpose or special-purpose computer. By way of example and not limitation, such computer-readable media can include RAM, ROM, EEPROM, CD-ROM or other optical disc storage, disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and is accessible to a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Furthermore, a connection can also be appropriately referred to as a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, or digital subscriber line (DSL), then the coaxial cable, fiber optic cable, twisted pair, or DSL is included in the definition of a medium. As used in this article, disk and disc include compact discs (CDs), laser discs, optical discs, digital multi-purpose discs (DVDs), hard disks, solid-state drives (SSDs), and Blu-ray discs. Disks typically reproduce data magnetically, while discs reproduce data optically using lasers. Combinations of these should also be included within the scope of computer-readable media.

[0145] As used herein (including in the claims), the term “and / or” in a list of two or more items means that any one of the listed items may be used alone, or any combination of two or more listed items may be used. For example, if a composition is described as containing components A, B, and / or C, then the composition may contain only A; only B; only C; a combination of A and B; a combination of A and C; a combination of B and C; or a combination of A, B, and C. Moreover, as used herein (including in the claims), the “or” in a list of items followed by “at least one of” indicates a disjunctive list, such that a list such as “at least one of A, B, or C” means A or B or C or AB or AC or BC or ABC (i.e., A and B and C) or any combination thereof.

[0146] The prior description of this disclosure is provided to enable any person skilled in the art to make or use this disclosure. Various modifications to this disclosure will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other variations without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not intended to be limited to the examples and designs described herein, but should be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication, comprising: Beam faults are detected by user equipment (UE) operating in discontinuous reception (DRX) mode; In response to the detection of the beam fault, a BFR request signal is transmitted in accordance with the beam fault recovery (BFR) procedure based on contention-free random access (CFRA) implemented by the UE. as well as The DRX mode operation is changed based on the CFRA-based BFR procedure implemented by the UE, wherein changing the DRX mode operation includes starting the DRX active time, and wherein the DRX mode is a wake-up signal (WUS) triggered DRX mode.

2. The method of claim 1, wherein the BFR request signal includes a random access channel (RACH) preamble and an associated message of the CFRA-based BFR procedure.

3. The method of claim 1, wherein starting the DRX active time includes: The DRX timer is triggered based on the physical downlink control channel (PDCCH) of the scheduled media access control (MAC) protocol data unit (PDU) received by the UE according to the CFRA-based BFR procedure, regardless of whether the UE is operating within the active time of the DRX mode when the UE receives the PDCCH of the scheduled MAC PDU.

4. The method of claim 3, wherein the DRX timer comprises a timer selected from the group consisting of: Inactive timer; Round-trip time (RTT) timer; and Retransmission timer.

5. The method of claim 1, wherein the DRX active time includes the definition of the DRX mode as including the active time of BFR procedure activities performed by the UE.

6. The method of claim 1, wherein changing the DRX mode operation comprises: After the UE transmits the BFR request signal, it focuses on monitoring the WUS in the BFR search space at least for the next DRX cycle.

7. The method of claim 1, wherein changing the DRX mode operation comprises: After the UE transmits the BFR request signal, the spatial filter used to receive the WUS is changed at least for the next DRX cycle.

8. The method of claim 7, wherein changing the spatial filter used to receive the WUS comprises: The spatial filter used to receive the WUS employs a quasi-co-location (QCL) assumption for the candidate beams of the CFRA-based BFR protocol.

9. The method of claim 7, wherein changing the spatial filter used to receive the WUS comprises: A second resource configuration is used for the WUS, wherein the second resource configuration for the WUS is different from the first WUS resource configuration used before the beam fault was detected.

10. The method of claim 9, wherein the second resource configuration for the WUS includes at least one of a control resource set, a search space set, or a downlink control information format.

11. The method of claim 10, wherein the search space set for the WUS is a BFR search space set associated with the CFRA-based BFR procedure.

12. The method of claim 1, wherein changing the DRX mode operation comprises: The non-WUS-triggered DRX mode operation is adopted. In the non-WUS-triggered DRX mode operation, the next DRX cycle is initiated after transmitting the BFR request signal, whether the UE receives the WUS or not.

13. The method of claim 1, wherein changing the DRX mode operation comprises: After transmitting the BFR request signal, the UE monitors the BFR search space set regardless of whether the UE is operating during the active time of the DRX mode.

14. The method of claim 13, wherein monitoring the BFR search space set by the UE after transmitting the BFR request signal comprises: The UE monitors the BFR search space set regardless of whether the UE is operating within the random access response (RAR) window of the CFRA-based BFR procedure.

15. An apparatus configured for wireless communication, the apparatus comprising: Memory; as well as At least one processor coupled to the memory, wherein the at least one processor is configured to: Beam faults are detected by user equipment (UE) operating in discontinuous reception (DRX) mode; In response to the detection of the beam fault, a BFR request signal is transmitted in accordance with the beam fault recovery (BFR) procedure based on contention-free random access (CFRA) implemented by the UE. as well as The DRX mode operation is changed based on the CFRA-based BFR procedure implemented by the UE, wherein changing the DRX mode operation includes starting the DRX active time, and wherein the DRX mode is a wake-up signal (WUS) triggered DRX mode.

16. The apparatus of claim 15, wherein the BFR request signal includes a random access channel (RACH) preamble and an associated message of the CFRA-based BFR procedure.

17. The apparatus of claim 15, wherein the start of DRX activation time comprises: The DRX timer is triggered based on the physical downlink control channel (PDCCH) of the scheduled media access control (MAC) protocol data unit (PDU) received by the UE according to the CFRA-based BFR procedure, regardless of whether the UE is operating within the active time of the DRX mode when the UE receives the PDCCH of the scheduled MAC PDU.

18. The apparatus of claim 17, wherein the DRX timer comprises a timer selected from the group consisting of: Inactive timer; Round-trip time (RTT) timer; and Retransmission timer.

19. The apparatus of claim 15, wherein the DRX active time includes the definition of the DRX mode as including the active time of BFR procedure activities performed by the UE.

20. The apparatus of claim 15, wherein changing the DRX mode operation comprises a DRX mode operation change selected from the group consisting of: After the UE transmits the BFR request signal, it monitors the WUS in the BFR search space at least for the next DRX cycle. After the UE transmits the BFR request signal, the spatial filter used to receive the WUS at least for the next DRX cycle is changed. The quasi-co-location (QCL) assumption for the candidate beams of the CFRA-based BFR procedure is used for the spatial filter used to receive the WUS. A second resource configuration for the WUS is used, wherein the second resource configuration for the WUS is different from the first WUS resource configuration used before the beam fault was detected; as well as The non-WUS-triggered DRX mode operation is adopted. In the non-WUS-triggered DRX mode operation, the next DRX cycle is initiated after transmitting the BFR request signal, whether the UE receives the WUS or not.

21. The apparatus of claim 20, wherein the second resource configuration for the WUS includes at least one of a control resource set, a search space set, or a downlink control information format.

22. The apparatus of claim 21, wherein the search space set for the WUS is a BFR search space set associated with the CFRA-based BFR procedure.

23. The apparatus of claim 15, wherein changing the DRX mode operation comprises: After transmitting the BFR request signal, the UE monitors the BFR search space set regardless of whether the UE is operating during the active time of the DRX mode.

24. The apparatus of claim 23, wherein monitoring the BFR search space set by the UE after transmitting the BFR request signal comprises: The UE monitors the BFR search space set regardless of whether the UE is operating within the random access response (RAR) window of the CFRA-based BFR procedure.

25. A method for wireless communication, comprising: A BFR request signal is received according to a Contest-Free Random Access (CFRA)-based Beam Fault Recovery (BFR) procedure implemented by a User Equipment (UE), wherein the BFR request signal is provided in association with a beam fault detected by the UE operating in a Wake-Up Signal (WUS) Triggered Discontinuous Receive (DRX) mode. as well as The DRX mode operation is changed based on the CFRA-based BFR procedure implemented by the UE, wherein changing the DRX mode operation includes changing the spatial filter of the WUS used at least for the next DRX cycle after receiving the BFR request signal.

26. The method of claim 25, wherein changing the spatial filter used for the WUS comprises: The spatial filter used to receive the WUS employs a quasi-co-location (QCL) assumption for the candidate beams of the CFRA-based BFR protocol.

27. The method of claim 25, wherein changing the spatial filter used for the WUS comprises: A second resource configuration is used for the WUS, wherein the second resource configuration for the WUS is different from the first WUS resource configuration used before the beam fault was detected.

28. The method of claim 27, wherein the second resource configuration for the WUS includes at least one of a control resource set, a search space set, or a downlink control information format.

29. The method of claim 28, wherein the search space set for the WUS is a BFR search space set associated with the CFRA-based BFR procedure.

30. An apparatus configured for wireless communication, the apparatus comprising: Memory; as well as At least one processor coupled to the memory, wherein the at least one processor is configured to: A BFR request signal is received according to a Contest-Free Random Access (CFRA)-based Beam Fault Recovery (BFR) procedure implemented by a User Equipment (UE), wherein the BFR request signal is provided in association with a beam fault detected by the UE operating in a Wake-Up Signal (WUS) Triggered Discontinuous Receive (DRX) mode. as well as The DRX mode operation is changed based on the CFRA-based BFR procedure implemented by the UE, wherein changing the DRX mode operation includes changing the spatial filter of the WUS used at least for the next DRX cycle after receiving the BFR request signal.

31. The apparatus of claim 30, wherein changing the spatial filter used for the WUS comprises: The spatial filter used to receive the WUS employs a quasi-co-location (QCL) assumption for the candidate beams of the CFRA-based BFR protocol.

32. The apparatus of claim 30, wherein changing the spatial filter used for the WUS comprises: A second resource configuration is used for the WUS, wherein the second resource configuration for the WUS is different from the first WUS resource configuration used before the beam fault was detected.

33. The apparatus of claim 32, wherein the second resource configuration for the WUS includes at least one of a control resource set, a search space set, or a downlink control information format.

34. The apparatus of claim 33, wherein the search space set for the WUS is a BFR search space set associated with the CFRA-based BFR procedure.

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