Beam Fault Detection (BFD) in the Sleep Bandwidth Part (BWP)

Abstract

Wireless communication systems and methods related to beam failure detection (BFD) in a dormant bandwidth part (BWP) are provided. A user equipment (UE) determines that a cell of a wireless communication network is operated in a dormant mode. The UE operates in a dormant mode for a cell of the wireless communication network, wherein the operation in the dormant mode includes performing beam failure detection (BFD) in a dormant bandwidth part (BWP) based on a configuration. The configuration may include a control resource set (CORESET) configuration for the dormant BWP.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Patent Cooperation Treaty (PCT) application serial number PCT / CN2020 / 076401 filed on February 24, 2020, the entire contents of which are incorporated herein by reference as if fully set forth below and for all applicable purposes. Technical Field

[0003] The present disclosure is directed to wireless communication systems and methods. Certain embodiments may implement and provide techniques for beam failure detection (BFD) in a dormant bandwidth part (BWP). Background Art

[0004] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcast, etc. These systems may be capable of supporting communication with multiple users by sharing available system resources (e.g., time, frequency, and power). A wireless multiple-access communication system may include multiple base stations (BSs), each of which simultaneously supports communication for multiple communication devices, which may be otherwise referred to as user equipment (UE).

[0005] To meet the growing demand for expanded mobile broadband connections, wireless communication technology is evolving from long-term evolution (LTE) technology to next-generation new radio (NR) technology, which may be referred to as the fifth generation (5G). For example, NR is designed to provide lower latency, higher bandwidth or higher throughput, and higher reliability than LTE. NR is designed to operate on a wideband array, for example, from low bands below about 1 gigahertz (GHz) and mid-bands from about 1 GHz to about 6 GHz, to high bands, such as millimeter wave (mmWave) bands. NR is also designed to operate across different spectrum types, from licensed spectrum to unlicensed and shared spectrum. Spectrum sharing enables operators to aggregate spectrum in a timely manner to dynamically support high-bandwidth services. Spectrum sharing can extend the advantages of NR technology to operating entities that may not have access to licensed spectrum.

[0006] NR can use beamforming in conjunction with BWP to benefit from wider channel bandwidths available at higher frequencies (e.g., mmWave bands). For example, path losses in higher frequency bands may be high, and wideband operation in wider channel bandwidths may be expensive. To overcome high path losses, the BS and / or UE may perform analog and / or digital beamforming to create narrow directional beams for communication. To avoid having the UE operate in a wide channel bandwidth, the BWP allows the UE to communicate with the BS using a frequency bandwidth that is smaller or narrower than the channel bandwidth. BWP refers to dividing the channel bandwidth into smaller frequency bands. For example, in NR, the BS can configure up to four BWPs for the UE in the channel bandwidth, and the BS can activate one BWP at any given time interval to communicate with the UE. The UE does not need to transmit or receive outside the configured frequency range of the active BWP, and power savings can therefore be provided at the UE. Summary of the invention

[0007] The following summarizes certain aspects of the present disclosure to provide a basic understanding of the technology discussed. This summary is not a comprehensive overview of all expected features of the present disclosure, and is neither intended to identify key or important elements of all aspects of the present disclosure, nor is it intended to delineate the scope of any or all aspects of the present disclosure. Its sole purpose is to present some concepts of one or more aspects of the present disclosure in the form of an outline as a preface to a more detailed description presented later.

[0008] For example, in one aspect of the present disclosure, a method of wireless communication performed by a first user equipment (UE), the method comprising determining that a cell for a wireless communication network operates in a sleep mode; and the cell for the wireless communication network operates in a sleep mode, wherein the operation in the sleep mode comprises performing beam fault detection (BFD) in a sleep bandwidth part (BWP) based on a configuration.

[0009] In an additional aspect of the present disclosure, a wireless communication method performed by a base station (BS) includes determining that a user equipment (UE) is operating in a sleep mode for a cell of a wireless communication network; and sending a configuration to the UE for performing beam failure detection (BFD) in a sleep bandwidth part (BWP) associated with the sleep mode.

[0010] In an additional aspect of the present disclosure, a user equipment (UE) includes a processor configured to determine that a cell for a wireless communication network operates in a sleep mode; and the cell for the wireless communication network operates in the sleep mode, wherein the operation in the sleep mode includes performing beam failure detection (BFD) in a sleep bandwidth part (BWP) based on a configuration.

[0011] In an additional aspect of the present disclosure, a base station (BS) includes a processor and a transceiver, the processor being configured to determine that a user equipment (UE) is operating in a sleep mode for a cell of a wireless communication network, and the transceiver being configured to send a configuration to the UE for performing beam failure detection (BFD) in a sleep bandwidth part (BWP) associated with the sleep mode.

[0012] After reading the following description of specific exemplary embodiments of the present invention in conjunction with the accompanying drawings, other aspects, features and embodiments of the present invention will become apparent to those of ordinary skill in the art. Although features of the present invention may be discussed with respect to certain embodiments and drawings below, all embodiments of the present invention may include one or more advantageous features discussed herein. In other words, although one or more embodiments may be discussed as having certain advantageous features, one or more of these features may also be used according to the various embodiments of the present invention discussed herein. In a similar manner, although exemplary embodiments may be discussed below as device, system or method embodiments, it should be understood that such exemplary embodiments may be implemented in various devices, systems and methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A wireless communication network according to some aspects of the present disclosure is shown.

[0014] Figure 2 A radio frame structure in accordance with some aspects of the present disclosure is shown.

[0015] Figure 3 A BWP configuration scheme according to some aspects of the present disclosure is shown.

[0016] Figure 4 A BWP configuration scheme according to some aspects of the present disclosure is shown.

[0017] Figure 5 is a block diagram of a user equipment (UE) according to some aspects of the present disclosure.

[0018] Figure 6 is a block diagram of an exemplary base station (BS) according to some aspects of the present disclosure.

[0019] Figure 7 is a signaling diagram of a BFD method according to some aspects of the present disclosure.

[0020] Figure 8 is a flow chart of a BFD method according to some aspects of the present disclosure.

[0021] Fig. 9 is a flow chart of a BFD method according to some aspects of the present disclosure.

[0022] Fig.10 is a flow chart of a BFD method operating in a sleep mode according to some aspects of the present disclosure.

[0023] Fig.11 A BFD RS measurement scheme according to some aspects of the present disclosure is shown.

[0024] Fig. 12A A dormant BWP configuration scheme according to some aspects of the present disclosure is shown.

[0025] Fig. 12B A dormant BWP configuration scheme according to some aspects of the present disclosure is shown.

[0026] Fig. 12C A dormant BWP configuration scheme according to some aspects of the present disclosure is shown.

[0027] Fig.13 is a flow chart of a method of wireless communication according to some aspects of the present disclosure.

[0028] Fig.14 is a flow chart of a method of wireless communication according to some aspects of the present disclosure.

[0029] Fig.15 is a flow chart of a method of wireless communication according to some aspects of the present disclosure.

[0030] Fig.16 is a flow chart of a method of wireless communication according to some aspects of the present disclosure. DETAILED DESCRIPTION

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

[0032] The present disclosure generally relates to wireless communication systems, also referred to as wireless communication networks. In various embodiments, these techniques and devices 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, global mobile communication systems (GSM) networks, fifth generation (5G) or new radio (NR) networks, and other communication networks. As described herein, the terms "network" and "system" can be used interchangeably.

[0033] OFDMA network can implement radio technology, such as Evolved UTRA (E-UTRA), Institute of Electrical and Electronics Engineers (IEEE) 802.11, IEEE 802.16, IEEE 802.20, flash-OFDM, etc. UTRA, E-UTRA and GSM are part of Universal Mobile Telecommunications System (UMTS). Specifically, Long Term Evolution (LTE) is a version of UMTS using E-UTRA. UTRA, E-UTRA, GSM, UMTS and LTE are described in documents provided by an organization named "3rd Generation Partnership Project" (3GPP), and cdma2000 is described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2). These various radio technologies and standards are known or under development. For example, the 3rd Generation Partnership Project (3GPP) is a collaboration between telecommunications association groups to define a globally applicable third generation (3G) mobile phone specification. 3GPP Long Term Evolution (LTE) is a 3GPP project that aims to improve the UMTS mobile phone standard. The 3GPP may define specifications for next generation mobile networks, mobile systems, and mobile devices. The present disclosure relates to the evolution of wireless technologies from LTE, 4G, 5G, NR and beyond, where access to the wireless spectrum is shared between networks using a set of new and different radio access technologies or radio air interfaces.

[0034] 5G networks are expected to be able to use a unified air interface based on OFDM to achieve a variety of deployments, a variety of spectrum, and a variety of services and devices. 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. The 5G NR will be able to expand to provide the following coverage (1) with ultra-high density (e.g., ~1M nodes / km 2 ), ultra-low complexity (e.g., ~10s of bits / second), ultra-low energy (e.g., ~10+ years of battery life), and deep coverage with the ability to reach challenging locations; (2) including mission-critical control with strong security to protect sensitive personal, financial, or confidential information, ultra-high reliability (e.g., ~99.9999% reliability), ultra-low latency (e.g., ~1ms), and users with extensive mobility or lack of mobility; and (3) with enhanced mobile broadband, including extremely high capacity (e.g., ~10Tbps / km 2 ), extremely high data rates (e.g., multi-Gbps rates, 100+Mbps user experience rates), and deep perception with advanced discovery and optimization.

[0035] The 5G NR can be implemented using an optimized OFDM-based waveform with a scalable numerology and transmission time interval (TTI); with a general, flexible framework to effectively multiplex services and features using dynamic, low-latency time division duplex (TDD) / frequency division duplex (FDD) designs; and with advanced wireless technologies such as massive multiple-input multiple-output (MIMO), robust millimeter wave (mmWave) transmission, advanced channel decoding, and device-centric mobility. The scalability of the numerology in the 5G NR with scaling of subcarrier spacing can effectively address the operation of different services across different spectrums and different deployments. For example, in various outdoor and macro coverage deployments of less than 3GHz FDD / TDD implementations, the subcarrier spacing can appear at 15kHz, such as on bandwidths (BW) such as 5, 10, 20MHz. For other various outdoor and small cell coverage deployments of TDD greater than 3GHz, the subcarrier spacing can appear at 30kHz on 80 / 100MHz BW. For various other indoor broadband implementations, using TDD on the unlicensed portion of the 5GHz band, subcarrier spacing can occur at 60kHz over 160MHz BW. Finally, for various deployments using the mmWave component for transmission under TDD at 28GHz, subcarrier spacing can occur at 120kHz over 500MHz BW.

[0036] The scalable parameter set of 5G NR facilitates scalable TTI for 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 transmission to start on symbol boundaries. 5G NR also anticipates a self-contained integrated subframe design with UL / downlink scheduling information, data, and acknowledgment in the same subframe. The self-contained integrated subframe supports communications in unlicensed or contention-based shared spectrum, adaptive UL / downlink, which can be flexibly configured on a per-cell basis to dynamically switch between UL and downlink to meet current business needs.

[0037] Various other aspects and features of the present disclosure are further described below. It is obvious that the teachings herein can be embodied in various forms, and any specific structure, function, or both disclosed herein are only representative and non-restrictive. Based on the teachings herein, it should be understood by those of ordinary skill in the art that an aspect disclosed herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement a device or implement a method. In addition, other structures, functions, or structures and functions other than or different from one or more aspects set forth herein can be used to implement such a device or practice such a method. For example, a method can be implemented as a part of a system, device, device, and / or implemented as instructions stored on a computer-readable medium for execution on a processor or computer. In addition, an aspect can include at least one element of a claim.

[0038] In order to apply beamforming technology to communication, the BS and the UE may perform beam measurement and beam selection to determine one or more optimal beams for communication. The best beam may refer to a transmission beam that can provide a high received power and / or a high signal-to-noise ratio (SNR) to the receiver. For example, the BS may send a set of reference signals, such as a synchronization signal block (SSB), by sweeping across multiple spatial directions to facilitate initial beam measurement and selection. Additionally, the BS may configure the UE with a set of reference signals for beam failure detection (BFD), which may include SSB, tracking reference signals (TRS), and / or channel state information-reference signals (CSI-RS). The set of reference signals configured for BFD may be referred to as BFD reference signals (BFDRS). For example, the UE may monitor the BFD RS and determine the link quality or beam quality based on the measurement of the BFD RS. For example, when the link quality measurement is below a certain threshold, the UE may detect a beam failure condition. When a beam failure is detected, the UE may perform beam recovery with the BS, for example, by requesting the BS to use transmission beams in different spatial directions.

[0039] In a wireless communication network, a BS may configure a UE to monitor a BFD RS that is spatially quasi-colocated (QCL) with a physical downlink control channel (PDCCH) demodulation reference signal (DMRS). In other words, the DL beam (or DL ​​channel condition) used to send the BFD RS may correspond to the DL beam (or DL ​​channel condition) used to send the PDCCH DMRS. In NR, there are several types of quasi-colocated relationships, for example, in terms of delay spread, Doppler spread, Doppler shift, average delay, and / or spatial reception parameters. The BS may configure one or more control resource sets (CORESETs) for the UE in the BWP, and may configure one or more PDCCH search spaces for the UE based on the CORESETs. Each CORESET may include one or more transmission configuration indication (TCI) states, which may indicate a DL reference signal (e.g., SSB, CSI-RS, and / or TRS) that is QCL with the corresponding PDCCH DMRS.

[0040] In some aspects, the BS may configure the UE to operate in a dormant BWP, for example, to save power. Since the UE is not expected to perform PDCCH monitoring in a dormant BWP, the BS may not configure a CORESET for the UE in a dormant BWP. However, the BS expects the UE to perform BFD when operating in a dormant BWP. Without a CORESET configured in a dormant BWP, the UE may not be able to determine which resources or BFD RS to monitor for BFD.

[0041] The present disclosure describes a mechanism for BFD in a dormant BWP. For example, a BS may configure a UE to operate in a dormant mode for a cell in a network. A cell may be a primary cell (PCell) or a secondary cell (SCell). When the UE operates in a dormant BWP, the BS may configure the UE with a BFD configuration for performing BFD. In some aspects, the BS may configure the UE to exclude performing BFD in a dormant BWP. In some aspects, when the UE operates in a dormant BWP, the BS may configure a set of rules for the UE to determine a BFD RS and corresponding resources for BFD RS monitoring.

[0042] In some aspects, if the UE is configured with an explicit BFD RS, the BS may configure the UE to perform BFD RS monitoring while operating in a dormant BWP. If the UE is not configured with any explicit BFD RS, the BS may configure the UE to suppress performing BFD. In some aspects, the BS may configure the UE to perform BFD in a dormant BWP by monitoring one or more BFD RSs that are quasi-colocated (QCL) with the CORESET in a non-dormant BWP before the UE switches to the dormant BWP. In some aspects, the BS may configure the UE with a non-dormant BWP paired with the dormant BWP. When the UE operates in the dormant BWP, the BS may configure the UE to monitor one or more BFD RSs that are QCL with the CORESET in the paired non-dormant BWP. In some aspects, the BS may configure the CORESET in the dormant BWP for the UE, but configure zero PDCCH candidates for the CORESET. The BS may configure the UE to monitor one or more BFD RSs that are QCL with the CORESET in the dormant BWP.

[0043] In some aspects, if the UE is configured with an implicit BFD RS, the BS may configure the UE to perform BFD RS monitoring in a dormant BWP. If the UE is not configured with any implicit BFD RS, the BS may configure the UE to refrain from performing BFD. In some aspects, the BS may configure the UE to monitor one or more BFD RSs associated with the TCI state of a CORESET in a non-dormant BWP before the UE switches to a dormant BWP, a paired non-dormant BWP, or a dormant BWP.

[0044] In some aspects, the BS may send one or more BFD RSs completely within the dormant BWP, partially within the dormant BWP, and / or outside the dormant BWP. In some aspects, the BS may configure the UE to perform measurements on the BFD RS, which is completely within the dormant BWP. In some aspects, when the BFD RS is partially within the dormant BWP, the BS may configure the UE to measure the portion of the BFD RS within the dormant BWP. Additionally, the BS may configure the UE to measure the entire BFD RS including the portion outside the dormant BWP. In some aspects, when the BFD RS is outside the dormant BWP, the BS may configure the UE to exclude measurements on the BFD RS. Alternatively, the BS may configure the UE to switch to the BWP where the BFD RS is located, or extend the BWP to include the BWP where the BFD RS is located, and measure the BFD RS.

[0045] In some aspects, the BS may configure a non-dormant BWP for the UE via radio resource control (RRC) configuration, and then switch the RRC-configured BWP to a dormant BWP via downlink control information (DCI), medium access control-control element (MAC-CE), or wake-up signal (WUS). The transition of the BWP to dormant mode may be permanent or last for a period of time.

[0046] Aspects of the present disclosure may provide several benefits. For example, the configuration of rules for determining an explicit BFD RS associated with a CORESET QCL in a BWP and / or an implicit BFD RS associated with a TCI state of a CORESET in a BWP enables the UE to perform BFD while operating in a dormant BWP. Thus, the UE may monitor beam quality in a dormant BWP and may perform a beam recovery procedure with the BS to switch to another beam or beam pair (e.g., UL and / or DL ​​beams) upon detecting a beam failure condition. Thus, when the BS determines to switch the UE back to a non-dormant BWP later, the BS and the UE may be ready to communicate using a beam from the most recent beam selection (e.g., based on the most recent beam recovery) without having to perform beam selection at the switching time. Thus, the present disclosure may reduce the activation time for switching from a dormant BWP to a non-dormant BWP.

[0047] Figure 1 A wireless communication network 100 according to some aspects of the present disclosure is shown. The network 100 may be a 5G network. The network 100 includes a plurality of base stations (BSs) 105 (labeled 105a, 105b, 105c, 105d, 105e, and 105f, respectively) and other network entities. The BS 105 may be a station that communicates with the UE 115, and may also be referred to as an evolved Node B (eNB), a next generation eNB (gNB), an access point (e.g., IEEE 802.11AP), etc. Each BS 105 may provide communication coverage for a particular geographic area. In 3GPP, the term "cell" may refer to the particular geographic coverage area of ​​the BS 105 and / or the BS subsystem serving the coverage area, depending on the context in which the term is used.

[0048] BS105 can provide communication coverage to macro cells or small cells (such as pico cells or femto cells and / or other types of cells). Macro cells generally cover a relatively large geographic area (e.g., a radius of several kilometers) and can allow unrestricted access by UEs that have service subscriptions with a network provider. Small cells (such as pico cells) generally cover relatively smaller geographic areas and can allow unrestricted access by UEs that have service subscriptions with a network provider. Small cells (such as femto cells) also generally cover relatively small geographic areas (e.g., homes) and, in addition to unrestricted access, can also provide restricted access to UEs associated with femto cells (e.g., UEs in a closed subscriber group (CSG), UEs of users in a home, etc.). A BS for a macro cell may be referred to as a macro BS. A BS for a small cell may be referred to as a small cell BS, a pico BS, a femto BS, or a home BS. In Figure 1 In the example shown, the BS 105 d and 105 e may be conventional macro BSs, while the BS 105 a-105 c may be macro BSs enabled with one of three-dimensional (3D), full-dimensional (FD), or massive MIMO. The BS 105 a-105 c may utilize its higher-dimensional MIMO capabilities to utilize 3D beamforming in elevation and azimuth beamforming to increase coverage and capacity. The BS 105 f may be a small cell BS, which may be a home node or a portable access point. The BS 105 may support one or more (e.g., two, three, four, etc.) cells.

[0049] The network 100 may support synchronous or asynchronous operation. For synchronous operation, the BSs may have similar frame timing, and transmissions from different BSs may be approximately aligned in time. For asynchronous operation, the BSs may have different frame timing, and transmissions from different BSs may not be aligned in time.

[0050] The UE 115 is dispersed throughout the wireless network 100, and each UE 115 can be stationary or mobile. UE 115 may also be referred to as a terminal, a mobile station, a subscriber unit, a station, etc. UE 115 may be a cellular phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a tablet computer, a laptop computer, a cordless phone, a wireless local loop (WLL) station, an IEEE 802.11 terminal station (STA), etc. On the one hand, UE 115 may be a device including a universal integrated circuit card (UICC). On the other hand, UE may be a device that does not include a UICC. In some aspects, UE 115 that does not include a UICC may also be referred to as an IoT device or an Internet of Everything (IoE) device. The UE 115a-115d is an example of a mobile smart phone type device that accesses the network 100. UE 115 may also be a machine specifically configured for connecting communications, including machine type communications (MTC), enhanced MTC (eMTC), narrowband IoT (NB-IoT), etc. The UEs 115e-115h are examples of various machines configured for accessing communications of the network 100. The UEs 115i-115k are examples of vehicles equipped with wireless communication devices configured for accessing communications of the network 100. The UE 115 may be able to communicate with any type of BS (whether macro BS, small cell, etc.). Figure 1 , the lightning ball (e.g., communication link) indicates wireless transmission between UE 115 and serving BS 105, or desired transmission between BS 105, backhaul transmission between BSs, or sidelink transmission between UE 115, where the serving BS 105 is a BS designated to serve the UE 115 on the downlink (DL) and / or uplink (UL).

[0051] In operation, the BSs 105a-105c may use 3D beamforming and cooperative spatial techniques such as coordinated multipoint (CoMP) or multi-connectivity to serve the UEs 115a and 115b. The macro BS 105d may perform backhaul communications with the BSs 105a-105c and the small cell BS 105f. The macro BS 105d may also transmit multicast services subscribed to and received by the UEs 115c and 115d. Such multicast services may include mobile TV or streaming video, or may include other services for providing community information, such as weather emergencies or alerts, such as Amber Alerts or Gray Alerts.

[0052] The BS 105 may also communicate with a core network. The core network may provide user authentication, access permission, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. At least some BSs 105 (e.g., which may be examples of gNBs or access node controllers (ANCs)) may interface with the core network via a backhaul link (e.g., NG-C, NG-U, etc.) and may perform radio configuration and scheduling for communicating with the UE 115. In various examples, the BSs 105 may communicate with each other directly or indirectly (e.g., via a core network) via a backhaul link (e.g., X1, X2, etc.), wherein the backhaul link may be a wired or wireless communication link.

[0053] The network 100 may also support mission-critical communications with ultra-reliable and redundant links for mission-critical devices such as UE 115e, which may be a drone. The redundant communication links with the UE 115e may include links from macro BSs 105d and 105e, and links from small cell BS 105f. Other machine-type devices such as the UE 115f (e.g., a thermometer), the UE 115g (e.g., a smart meter), and the UE 115h (e.g., a wearable device) may communicate in a multi-step configuration through the network 100 directly with BSs such as the small cell BS 105f and the macro BS 105e, or by communicating with another user device that relays its information to the network, such as UE 115f communicating temperature measurement information to the smart meter UE 115g, which is then reported to the network by the small cell BS 105f. The network 100 may also provide additional network efficiency through dynamic low-latency TDD / FDD communications, such as V2V, V2X, C-V2X communications between UE 115i, 115j, or 115k and other UEs 115, and / or vehicle-to-infrastructure (V2I) communications between UE 115i, 115j, or 115k and BS 105.

[0054] In some implementations, the network 100 communicates using an OFDM-based waveform. An OFDM-based system can divide the system BW into multiple (K) orthogonal subcarriers, which are also commonly referred to as subcarriers, tones, bins, etc. Each subcarrier can be modulated with data. In some cases, the subcarrier spacing between adjacent subcarriers can be fixed, and the total number of subcarriers (K) can depend on the system BW. The system BW can also be divided into subbands. In other instances, the subcarrier spacing and / or the duration of the TTI can be scalable.

[0055] In some aspects, the BS 105 may allocate or schedule transmission resources (e.g., in the form of time-frequency resource blocks (RBs)) for downlink (DL) and uplink (UL) transmissions in the network 100. DL refers to the transmission direction from the BS 105 to the UE 115, and UL refers to the transmission direction from the UE 115 to the BS 105. The communication may be in the form of a radio frame. A radio frame may be divided into a plurality of subframes or time slots, such as about 10. Each time slot may be further divided into micro time slots. In FDD mode, simultaneous UL and DL transmissions may occur in different frequency bands. For example, each subframe includes a UL subframe in a UL band and a DL subframe in a DL band. In TDD mode, UL and DL transmissions occur in different time periods using the same frequency band. For example, a subset of subframes (e.g., DL subframes) in a radio frame may be used for DL ​​transmission, and another subset of subframes (e.g., UL subframes) in the radio frame may be used for UL transmission.

[0056] The DL subframe and the UL subframe can be further divided into several areas. For example, each DL or UL subframe can have a predefined area for transmitting reference signals, control information and data. A reference signal is a predetermined signal that facilitates communication between the BS 105 and the UE 115. For example, a reference signal can have a specific pilot pattern or structure, wherein the pilot frequency modulation can span an operating BW or frequency band, each located at a predefined time and a predefined frequency. For example, the BS 105 can send a cell-specific reference signal (CRS) and / or a channel state information-reference signal (CSI-RS) to enable the UE 115 to estimate the DL channel. Similarly, the UE 115 can send a sounding reference signal (SRS) to enable the BS 105 to estimate the UL channel. Control information may include resource allocation and protocol control. Data may include protocol data and / or operational data. In some aspects, the BS 105 and the UE 115 can communicate using a self-contained subframe. A self-contained subframe may include a portion for DL ​​communication and a portion for UL communication. A self-contained subframe may be centered on the DL or centered on the UL. A DL-centric subframe may include a longer duration for DL ​​communications than a duration for UL communications. A UL-centric subframe may include a longer duration for UL communications than a duration for UL communications.

[0057] In some aspects, the network 100 may be an NR network deployed on a licensed spectrum. The BS 105 may send synchronization signals (e.g., including a primary synchronization signal (PSS) and a secondary synchronization signal (SSS)) in the network 100 to facilitate synchronization. The BS 105 may broadcast system information associated with the network 100 (e.g., including a master information block (MIB), remaining system information (RMSI), and other system information (OSI)) to facilitate initial network access. In some cases, the BS 105 may broadcast the PSS, SSS, and / or MIB in the form of a synchronization signal block (SSB) over a physical broadcast channel (PBCH), and may broadcast the RMSI and / or OSI over a physical downlink shared channel (PDSCH).

[0058] In some aspects, a UE 115 attempting to access the network 100 may perform an initial cell search by detecting a PSS from the BS 105. The PSS may enable synchronization of periodic timing and may indicate a physical layer identification value. The UE 115 may then receive the SSS. The SSS may enable radio frame synchronization and may provide a cell identification value that may be combined with a physical layer identification value to identify the cell. The PSS and the SSS may be located in the center portion of a carrier or at any suitable frequency within the carrier.

[0059] After receiving the PSS and SSS, the UE 115 may receive the MIB. The MIB may include system information for initial network access and scheduling information for RMSI and / or OSI. After decoding the MIB, the UE 115 may receive the RMSI and / or OSI. The RMSI and / or OSI may include radio resource control (RRC) information related to random access channel (RACH) procedures, paging, control resource sets (CORESET) for physical downlink control channel (PDCCH) monitoring, physical UL control channel (PUCCH), physical UL shared channel (PUSCH), power control, and SRS.

[0060] After obtaining the MIB, RMSI and / or OSI, the UE 115 may perform a random access procedure to establish a connection with the BS 105. In some examples, the random access procedure may be a four-step random access procedure. For example, the UE 115 may send a random access preamble, and the BS 105 may respond with a random access response. The random access response (RAR) may include a detected random access preamble identifier (ID) corresponding to the random access preamble, timing advance (TA) information, UL authorization, a temporary cell radio network temporary identifier (C-RNTI), and / or a backoff indicator. Upon receiving the random access response, the UE 115 may send a connection request (e.g., an RRC connection request) to the BS 105, and the BS 105 may respond with a connection response. The connection response may indicate contention resolution. In some examples, the random access preamble, RAR, connection request, and connection response may be referred to as message 1 (MSG1), message 2 (MSG2), message 3 (MSG3), and message 4 (MSG4), respectively. In some examples, the random access procedure may be a two-step random access procedure, where the UE 115 may send a random access preamble and a connection request in a single transmission, and the BS 105 may respond by sending a random access response and a connection response in a single transmission.

[0061] After establishing the connection, the UE 115 and the BS 105 may enter a normal operation phase, in which operation data may be exchanged. For example, the BS 105 may schedule the UE 115 for UL and / or DL ​​communications. The BS 105 may send UL and / or DL ​​scheduling authorizations to the UE 115 via the PDCCH. The scheduling authorization may be sent in the form of DL control information (DCI). The BS 105 may send DL communication signals (e.g., carrying data) to the UE 115 via the PDSCH according to the DL scheduling authorization. The UE 115 may send UL communication signals to the BS 105 via the PDSCH and / or PUCCH according to the UL scheduling authorization.

[0062] In some aspects, BS105 may communicate with UE 115 using HARQ technology to improve communication reliability, such as to provide URLLC services. The BS105 may schedule UE 115 to perform PDSCH communication by sending a DL grant in the PDCCH. The BS105 may send a DL data packet to the UE 115 according to the scheduling in the PDSCH. The DL data packet may be sent in the form of a transport block (TB). If the UE 115 successfully receives the DL data packet, the UE 115 may send a HARQ ACK to the BS105. On the contrary, if the UE 115 fails to successfully receive the DL transmission, the UE 115 may send a HARQ NACK to the BS105. When the HARQ NACK is received from the UE 115, the BS105 may resend the DL data packet to the UE 115. The retransmission may include a decoded version of the DL data identical to the initial transmission. Alternatively, the retransmission may include a decoded version of the DL data different from the initial transmission. The UE 115 may apply soft combining to combine the coded data received from the initial transmission and retransmission for decoding.The BS 105 and the UE 115 may also apply HARQ to UL communications using a mechanism substantially similar to the DL HARQ.

[0063] In some aspects, the network 100 may operate on a system BW or a component carrier (CC) BW. The network 100 may divide the system BW into multiple BWPs (e.g., portions). The BS 105 may dynamically assign the UE 115 to operate on a certain BWP (e.g., a portion of the system BW). The assigned BWP may be referred to as an active BWP. The UE 115 may monitor the active BWP for signaling information from the BS 105. The BS 105 may schedule the UE 115 for UL or DL ​​communications in the active BWP. In some aspects, the BS 105 may assign a pair of BWPs within the CC to the UE 115 for UL and DL communications. For example, the BWP pair may include one BWP for UL communications and one BWP for DL ​​communications. This will be described below. Figure 3 and Figure 4 The mechanisms used for BWP configuration are more fully described in .

[0064] In some aspects, the network 100 may operate at a higher frequency band (e.g., a mmWave band). The BS 105 and the UE 115 may apply analog and / or digital beamforming to form narrow directional beams for communication. To facilitate beamforming, the BS 105 and the UE 115 may perform beam measurement and selection to determine one or more optimal beams for communication. The optimal beam may refer to a transmission beam that can provide a high received power and / or a high SNR to a receiver. For example, the BS 105 may send a set of reference signals, such as SSB, in multiple spatial directions to facilitate initial beam measurement and selection. After the UE 115 successfully establishes a connection with the network 100, the BS 105 may configure the UE 115 with a set of reference signals for BFD, which may be SSB, TRS, and / or CSI-RS. For example, the UE 115 may monitor the BFD RS and determine the link quality based on the measurement results of the BFD RS. For example, when the link quality measurement is below a certain threshold, the UE 115 may detect a beam failure condition and may request a beam in a different spatial direction from the BS. In some aspects, the BS 105 may configure the UE 115 to operate in a dormant BWP, e.g., to save power, and may configure a set of rules for the UE to perform BFD RS monitoring for BFD. Mechanisms for performing BWP in dormant mode are described in more detail herein.

[0065] Figure 2 2 is a timing diagram illustrating a radio frame structure 200 according to some aspects of the present disclosure. Radio frame structure 200 may be employed by a BS (such as BS 105) and a UE (such as UE 115) in a network (such as network 100) for communication. In particular, the BS may communicate with the UE using the time-frequency resources configured as shown in radio frame structure 200. Figure 2 , the x-axis represents time in some arbitrary units, and the y-axis represents frequency in some arbitrary units. Transmission frame structure 200 includes radio frame 201. The duration of radio frame 201 can vary according to various aspects. In one example, radio frame 201 can have a duration of approximately 10 milliseconds. Radio frame 201 includes M time slots 202, where M can be any suitable positive integer. In one example, M may be approximately 10.

[0066] Each time slot 202 includes a plurality of subcarriers 204 in frequency and a plurality of symbols 206 in time. The number of subcarriers 204 and / or the number of symbols 206 in the time slot 202 may vary based on aspects such as channel bandwidth, subcarrier spacing (SCS) and / or CP mode. One subcarrier 204 in frequency and one symbol 206 in time form one resource element (RE) 212 for transmission. A resource block (RB) 210 is formed by a plurality of consecutive subcarriers 204 in frequency and a plurality of consecutive symbols 206 in time.

[0067] In the example, the BS (e.g., Figure 1 BS 105 in the example may schedule UEs (eg, Figure 1 1) for UL and / or DL ​​communications. Each time slot 202 may be time-divided into K mini-time slots 208. Each mini-time slot 208 may include one or more code elements 206. The mini-time slots 208 in the time slot 202 may have variable lengths. For example, when the time slot 202 includes N code elements 206, the mini-time slot 208 may have a length between one code element 206 and (N-1) code elements 206. In some aspects, the mini-time slot 208 may have a length of about two code elements 206, about four code elements 206, or about seven code elements 206. In some examples, the BS may schedule the UE at a frequency granularity of a resource block (RB) 210 (e.g., including about 12 subcarriers 204).

[0068] about Figure 4 discuss Figure 3 To illustrate the BWP configuration mechanism. Figure 3 A BWP configuration scheme 300 according to some aspects of the present disclosure is shown. Scheme 300 may be employed by a BS (such as BS 105) and a UE (such as UE 115) in a network (such as network 100). In particular, a BS (e.g., BS 105) may configure multiple BWPs for a UE (e.g., UE 115), as shown in scheme 300. Figure 3 , the x-axis represents time in some arbitrary units, and the y-axis represents frequency in some arbitrary units. In scheme 300, the BS and UE may operate in channels on frequency band 301. Frequency band 301 may be at any frequency and may span any suitable frequency bandwidth. In some cases, frequency band 301 may be a mmWave band and may include a wide bandwidth (e.g., approximately 40 MHz, 80 MHz, 100 MHz, 500 MHz, or more). For simplicity of illustration and discussion, Figure 3The frequency band 301 is shown divided into two BWPs 310 (shown as 310a and 310b). However, the frequency band 301 may be divided into any suitable BWPs 310. Additionally, the BWPs 310 may be non-overlapping as shown or partially overlapping.

[0069] exist Figure 3 In the example shown, the BS configures two BWPs 310a and 310b for the UE. The BS may configure one or more CORESETs 320 for the UE in the BWP 310. Each CORESET 320 includes a set of physical time and frequency resources (e.g., a set of PRBs similar to RB 210) in which the PDCCH may be transmitted. For example, the BS configures two CORESETs 320 for the UE in the BWP 310b. In some aspects, the BS may configure the BWP 310b as an active BWP for communicating with the UE. In some aspects, the BS may configure the UE to operate in a sleep mode in the BWP 310a (which may be referred to as a sleep BWP). In some aspects, the BS may not configure any CORESETs in the sleep BWP 310a because it is not expected that the UE performs PDCCH monitoring in the sleep BWP 310a. In some aspects, the BS may configure the CORESETs 320 in the sleep BWP 310a. Figure 4 Configure the UE with the BWP configuration shown.

[0070] Figure 4A BWP configuration scheme 400 is shown according to some aspects of the present disclosure. The scheme 400 may be employed by a BS (such as BS 105) and a UE (such as UE 115) in a network (such as network 100). In particular, the BS (e.g., BS 105) may configure a BWP configuration 410 for a UE (e.g., UE 115) as shown in the scheme 400. In some aspects, the BWP configuration 410 is an RRC configuration. The BS may indicate the BWP configuration 410 in the form of an RRC information element (IE) carried in an RRC message. The BWP configuration 410 may include various information related to the BWP (e.g., BWP 310), such as frequency location, bandwidth, subcarrier spacing, and / or cyclic prefix. The BWP configuration 410 may also include a PDCCH configuration 420 (e.g., an RRC message IE) for the corresponding BWP. The PDCCH configuration 420 may include various information for PDCCH monitoring, such as CORESET and / or PDCCH search space. In some aspects, the BS may configure up to about 3 CORESETs and about 10 PDCCH search space sets for the UE within the configured BWP. For example, when the UE may monitor the PDCCH in a certain CORESET, the search space set provides the UE with time domain parameters related to PDCCH monitoring. The search space set may include parameters that the UE may use to perform blind decoding on the PDCCH, such as aggregation level and / or number of PDCCH candidates.

[0071] exist Figure 4 In the example shown, the PDCCH configuration 420 includes a CORESET configuration 430. The CORESET configuration 430 indicates CORESET#0 and CORESET#1, which may be similar to CORESET 320. The CORESET configuration 430 may include various information for each CORESET, such as resource information (including a starting PRB index, a number of PRBs, a starting symbol index, and / or a number of symbols) and / or TCI state information. As shown, CORESET#0 may include TCI state 0 and TCI state 1, and CORESET#1 may include TCI state M-1. The TCI state information may provide the UE with QCL information between the PDCCH DMRS and other reference signals (e.g., SSB, CSI-RS, and / or TRS).

[0072] In some aspects, the BS may be configured 440 with a TCI state table 440. The UE may determine the QCL information associated with the CORESET based on the TCI state table 440. Each row in the TCI state table 440 provides reference signal resource information and QCL type information for a certain TCI state. The reference signal resource information may indicate the location of the time and / or frequency resources (e.g., symbols and / or subcarriers) where the BS may send a corresponding reference signal. The QCL type information may indicate QCL type A, QCL type B, QCL type C, and / or QCL type D. QCL type A may refer to Doppler spread, Doppler shift, delay spread, and / or average delay channel characteristics. QCL type B may refer to Doppler shift and Doppler spread channel characteristics. QCL type C may refer to average delay and Doppler shift channel characteristics. QCL type D may refer to spatial reception parameters. Therefore, when TCI state 0 defines a source reference signal for a physical signal or channel (e.g., PDCCH), the UE can configure its receive beam in the same manner as it is configured to receive SSBs with index #n. Similarly, when TCI state 1 defines a source reference signal for a physical signal or channel (e.g., PDCCH), the UE can configure its receive beam in the same manner as it is configured to receive CSI-RS with index #k. When TCI state M-1 defines a source reference signal for a physical signal or channel (e.g., PDCCH), the UE can configure its receive beam in the same manner as it is configured to receive SSBs with index #p.

[0073] Thus, when the BS configures the UE to monitor the BFD RS spatially QCL with the PDCCH DMRS in the BWP (e.g., BWP 310), the UE may configure its receive beam for BFD RS monitoring based on the TCI state indicated in the CORESET configuration 430. As an example, CORESET#1 and CORESET#2 may correspond to Figure 3 320 in the BWP 310a of the UE. Therefore, based on the CORESET configuration 430 and the TCI state table 440, the UE may perform BFD RS monitoring by monitoring the SSB with index #n, the CSI-RS with index #k, and the SSB with index #p. The UE may determine whether a beam failure has occurred based on measurements performed on the SSB with index #n, the CSI-RS with index #k, and / or the SSB with index #p.

[0074] As described above, the BS may not configure any CORESET in a dormant BWP (e.g., dormant 310b) because the UE is not expected to monitor the PDCCH in the dormant BWP. For example, the BS may configure an RRC configuration similar to RRC configuration 410 for the dormant BWP, but may not include the PDCCH configuration IE in the BWP configuration. Therefore, the UE may not be able to determine which BFD RS to monitor for BFD.

[0075] Therefore, the present application provides techniques for a UE to perform BFD RS monitoring while operating in a sleep mode or a sleep BWP.For example, the BS may configure various rules for the UE when determining which BFD RSs to monitor for BFD.

[0076] Figure 5 5 is a block diagram illustrating an exemplary UE 500 according to some aspects of the present disclosure. UE 500 may be the above Figure 1 1. As shown, the UE 500 may include a processor 502, a memory 504, a BFD module 508, a transceiver 510 including a modem subsystem 512 and a radio frequency (RF) unit 514, and one or more antennas 516. These elements may communicate with each other directly or indirectly, for example via one or more buses.

[0077] The processor 502 may include a central processing unit (CPU), a digital signal processor (DSP), an application specific integrated circuit (ASIC), a controller, a field programmable gate array (FPGA) device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein. The processor 502 may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors combined with a DSP core, or any other such configuration.

[0078] The memory 504 may include a cache memory (e.g., a cache memory of the processor 502), a random access memory (RAM), a magnetoresistive RAM (MRAM), a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), flash memory, a solid-state storage device, a hard drive, other forms of volatile and non-volatile memory, or a combination of different types of memory. In one aspect, the memory 504 includes a non-transitory computer-readable medium. The memory 504 may store or have recorded thereon instructions 506. The instructions 506 may include instructions that, when executed by the processor 502, cause the processor 502 to perform the various aspects of the present disclosure (e.g., the UE 115 described herein) in conjunction with the present disclosure. Figure 1-4 and Figure 7-13 The instructions 506 may also be referred to as program code. The program code may be used to cause the wireless communication device to perform the operations, for example, by causing one or more processors (such as processor 502) to control or command the wireless communication device to perform the operations. The terms "instructions" and "code" should be broadly interpreted to include any type of computer-readable statements. For example, the terms "instructions" and "code" may refer to one or more programs, routines, subroutines, functions, processes, etc. "Instructions" and "code" may include a single computer-readable statement or many computer-readable statements.

[0079] The BFD module 508 may be implemented via hardware, software, or a combination thereof. For example, the BFD module 508 may be implemented as a processor, circuit, and / or instructions 506 stored in the memory 504 and executed by the processor 502. In some cases, the BFD module 508 may be integrated into the modem subsystem 512. For example, the BFD module 508 may be implemented by a combination of software components (e.g., executed by a DSP or general purpose processor) and hardware components (e.g., logic gates and circuits) within the modem subsystem 512.

[0080] The BFD module 508 may be used in various aspects of the present disclosure, such as Figure 1-4 and aspects of 7-13. For example, the BFD module 508 is configured to determine that a cell of the wireless communication network operates in a sleep mode. The wireless communication network may be similar to network 100. In some aspects, the cell of the network includes a secondary cell. In some aspects, the cell of the network includes a primary cell. In some aspects, the BFD module 508 may determine to operate in a sleep mode based on a configuration or trigger received from a BS (e.g., BS105, 600, and / or 702). The BFD module 508 is also configured to operate in a sleep mode for a cell of the wireless communication network. The BFD module 508 is also configured to operate in a sleep mode by performing BFD according to a BFD configuration.

[0081] In some aspects, the BFD module 508 is configured to perform BFD by refraining from performing BFD in a dormant BWP (e.g., BWP 310a). In some aspects, the BFD module 508 is configured to perform BFD by monitoring one or more BFD RSs in the dormant BWP. In some aspects, the BFD module 508 is further configured to receive a CORESET configuration for the dormant BWP, and further monitor one or more BFD RSs based on the CORESET configuration for the dormant BWP. In some aspects, the CORESET may include zero PDCCH candidates per aggregation level and per search space.

[0082] In some aspects, the BFD module 508 is configured to perform BFD by monitoring one or more BFD RSs in the BWP when the BFD configuration explicitly indicates one or more BFD RSs, and refrain from performing BFD when the BFD configuration fails to explicitly indicate one or more BFD RSs. In some aspects, the BFD module 508 is configured to monitor one or more BFD RSs with the CORESET QCL. When there is more than one QCL type for the CORESET, the BFD module 508 is configured to monitor a BFD RS with type D quasi-colocation with the CORESET.

[0083] In some aspects, the BFD module 508 is configured to perform BFD by monitoring one or more BFD RSs in the BWP when the BFD configuration implicitly indicates one or more BFD RSs, and refrain from performing BFD when the BFD configuration fails to implicitly indicate one or more BFD RSs. In some aspects, the BFD module 508 is configured to monitor one or more BFD RSs associated with a TCI state of the CORESET. When there is more than one TCI state for the CORESET, the BFD module 508 is configured to monitor the BFD RS in a TCI state with a type D quasi-colocation with the CORESET.

[0084] In some aspects, the BFD module 508 is configured to perform BFD by at least one of: monitoring one or more explicit BFD RSs in the BWP when the BFD configuration explicitly indicates one or more explicit BFD RSs; or monitoring one or more implicit BFD RSs in the BWP when the BFD configuration fails to explicitly indicate one or more explicit BFD RSs.

[0085] In some aspects, the BFD module 508 is configured to perform BFD by monitoring one or more BFD RSs in a BWP, wherein the BWP includes a BWP used by the UE 500 prior to operating in the sleep mode.

[0086] In some aspects, the BFD module 508 is configured to perform BFD by monitoring one or more BFD RSs in a BWP, wherein the BWPs include a first BWP used before the UE 500 operates in the sleep mode and a sleep BWP used when the UE 500 operates in the sleep mode.

[0087] In some aspects, the BFD module 508 is configured to perform BFD by monitoring one or more BFD RSs entirely in a dormant BWP. In some other aspects, the BFD module 508 is configured to perform BFD by monitoring one or more BFD RSs partially within a dormant BWP, wherein a first portion of each of the one or more BFD RSs is within the dormant BWP, and a second portion of each of the one or more BFD RSs is outside the dormant BWP. In some aspects, the BFD module 508 is configured to perform BFD by measuring at least one parameter of the first portion of each of the one or more BFD RSs. In some aspects, the BFD module 508 is configured to perform BFD by measuring at least one parameter of each of the one or more BFD RSs based on the first and second portions. In some aspects, the BFD module 508 is configured to perform BFD by suppressing monitoring of one or more BFD RSs outside the dormant BWP. In other aspects, performing BFD at block 1320 may include monitoring one or more BFD RSs outside the dormant BWP.

[0088] In some aspects, the BFD module 508 is also configured to receive a BFD configuration. In some aspects, the BFD module 508 is also configured to receive a BFD configuration via at least one of a DCI, a MAC-CE, or a WUS. In some aspects, the BFD configuration indicates that the first BWP is associated with a sleep mode and the second BWP is associated with a non-sleep mode. In some aspects, the BFD configuration has a first duration. In some aspects, the first duration is permanent. In some aspects, the first duration is based on at least one of a timer or a predetermined value. In some aspects, the first duration is based on the number of transitions between the sleep mode and the non-sleep mode. This article describes in more detail the mechanism for performing BFD monitoring and measurement when operating under a sleep BWP.

[0089] As shown, the transceiver 510 may include the modem subsystem 512 and the RF unit 514. The transceiver 510 may be configured to communicate bidirectionally with other devices such as the BS 105. The modem subsystem 512 may be configured to modulate and / or encode data from the memory 504 and / or the BFD module 508 according to a modulation and coding scheme (MCS) (e.g., a low-density parity check (LDPC) coding scheme, a turbo coding scheme, a convolutional coding scheme, a polarization coding scheme, a digital beamforming scheme, etc.). The RF unit 514 may be configured to process (e.g., perform analog-to-digital conversion or digital-to-analog conversion, etc.) the modulated / encoded data (e.g., PUSCH, PUCCH, beam measurements, beam failure indications) from the modem subsystem 512 (on outbound transmissions) or a transmission originating from another source such as the UE 115 or the BS 105. The RF unit 514 may also be configured to perform analog beamforming in conjunction with the digital beamforming. Although shown as being integrated together in the transceiver 510, the modem subsystem 512 and the RF unit 514 may be separate devices coupled together at the UE 115 to enable the UE 115 to communicate with other devices.

[0090] The RF unit 514 may provide modulated and / or processed data (e.g., data packets (or more generally, data messages that may include one or more data packets and other information)) to the antenna 516 for transmission to one or more other devices. The antenna 516 may also receive data messages sent from other devices. The antenna 516 may provide received data messages for processing and / or demodulation at the transceiver 510. The transceiver 510 may provide demodulated and decoded data (e.g., PDCCH, PDSCH, BFD configuration, BWP configuration, BWP activation, BWP state transition trigger, WUS, BFDRS, SSB, CSI-RS, TRS) to the BFD module 508 for processing. The antenna 516 may include multiple antennas of similar or different designs to maintain multiple transmission links. The RF unit 514 may configure the antenna 516.

[0091] In one aspect, the UE 500 may include multiple transceivers 510 that implement different RATs (e.g., NR and LTE). In one aspect, the UE 500 may include a single transceiver 510 that implements multiple RATs (e.g., NR and LTE). In one aspect, the transceiver 510 may include various components, where different combinations of components may implement different RATs.

[0092] Figure 6 is a block diagram of an exemplary BS 600 according to some aspects of the present disclosure. BS 600 may be the above Figure 1105 in the network 100 discussed in . As shown, BS 600 may include a processor 602, a memory 604, a beam configuration / transmission module 608, a transceiver 610 including a modem subsystem 612 and an RF unit 614, and one or more antennas 616. These elements may communicate with each other directly or indirectly, for example via one or more buses.

[0093] The processor 602 may have various characteristics as a particular type of processor. For example, these may include a CPU, a DSP, an ASIC, a controller, an FPGA device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein. The processor 602 may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors combined with a DSP core, or any other such configuration.

[0094] The memory 604 may include a cache memory (e.g., a cache memory of the processor 602), RAM, MRAM, ROM, PROM, EPROM, EEPROM, flash memory, a solid-state storage device, one or more hard disk drives, a memristor-based array, other forms of volatile and non-volatile memory, or a combination of different types of memory. In some aspects, the memory 604 may include a non-transitory computer-readable medium. The memory 604 may store instructions 606. The instructions 606 may include instructions that, when executed by the processor 602, cause the processor 602 to perform the operations described herein, such as Figure 1-4 , Figure 7-1 2 and Fig.14 Instructions 606 may also be referred to as code, which may be broadly interpreted to include any type of computer-readable statements, such as those described above. Figure 5 discussed.

[0095] The beam configuration / transmission module 608 may be implemented via hardware, software, or a combination thereof. For example, the beam configuration / transmission module 608 may be implemented as a processor, circuit, and / or instructions 606 stored in the memory 604 and executed by the processor 602. In some cases, the beam configuration / transmission module 608 may be integrated into the modem subsystem 612. For example, the beam configuration / transmission module 608 may be implemented by a combination of software components (e.g., executed by a DSP or general purpose processor) and hardware components (e.g., logic gates and circuits) within the modem subsystem 612.

[0096] The beam configuration / transmission module 608 may be used in various aspects of the present disclosure, such as Figure 1-4 , Figure 7-1 2 and Fig.14For example, the beam configuration / transmission module 608 is configured to determine that a UE (e.g., UE 115 and / or 500) is operating in a sleep mode for a cell of a wireless communication network. The wireless communication network may be similar to network 100. In some aspects, a cell of the network includes a secondary cell. In some aspects, a cell of the network includes a primary cell. In some aspects, the beam configuration / transmission module 608 is configured to determine that the UE is operating in a sleep mode based on a configuration or trigger sent by the beam configuration / transmission module 608. The beam configuration / transmission module 608 is also configured to send one or more BFD RSs according to a BFD configuration in response to determining that the UE is operating in a sleep mode.

[0097] In some aspects, the beam configuration / transmission module 608 is configured to transmit the BFD RS by transmitting one or more BFD RS in a dormant BWP (e.g., BWP 310a). In some aspects, the beam configuration / transmission module 608 is configured to transmit a CORESET configuration for the dormant BWP and transmit one or more BFD RS based on the CORESET configuration for the dormant BWP.

[0098] In some aspects, the beam configuration / transmission module 608 is configured to send a BFD configuration to the UE. In some aspects, the BFD configuration explicitly indicates one or more BFD RSs. In some aspects, the BFD configuration implicitly indicates one or more BFD RSs. In some aspects, the configuration / transmission module 608 is configured to send the BFD configuration via at least one of a DCI, a MAC-CE, or a WUS.

[0099] In some aspects, the beam configuration / transmission module 608 is configured to transmit one or more BFD RSs by transmitting one or more BFD RSs with the CORESET QCL. In some aspects, the beam configuration / transmission module 608 is configured to transmit one or more BFD RSs by transmitting one or more BFD RSs based on the TCI state of the CORESET.

[0100] In some aspects, the beam configuration / transmission module 608 is configured to transmit the one or more BFD RSs by transmitting the one or more BFD RSs in a BWP, wherein the BWP comprises a BWP used by the UE before operating in the sleep mode.

[0101] In some aspects, the beam configuration / transmission module 608 is configured to transmit one or more BFD RSs by transmitting one or more BFD RSs in a BWP, wherein the BWP includes a BWP used before the UE operates in the sleep mode and a sleep BWP used when the UE operates in the sleep mode.

[0102] In some aspects, the beam configuration / transmission module 608 is configured to transmit the one or more BFD RSs by transmitting the one or more BFD RSs completely in the dormant BWP. In some aspects, the beam configuration / transmission module 608 is configured to transmit the one or more BFD RSs by transmitting the one or more BFD RSs partially within the dormant BWP, wherein a first portion of each of the one or more BFD RSs is within the dormant BWP and a second portion of each of the one or more BFD RSs is outside the dormant BWP. In some aspects, the beam configuration / transmission module 608 is configured to transmit the one or more BFD RSs by transmitting the one or more BFD RSs outside the dormant BWP.

[0103] In some aspects, the BFD configuration indicates that the first BWP is associated with a sleep mode and the second BWP is associated with a non-sleep mode. In some aspects, the BFD configuration has a first duration. In some aspects, the first duration is permanent. In some aspects, the first duration is based on at least one of a timer or a predetermined value. In some aspects, the first duration is based on the number of transitions between the sleep mode and the non-sleep mode. This article describes in more detail a mechanism for facilitating BFD RS monitoring and measurement of FD at the UE when the UE operates in a sleep BWP.

[0104] As shown, the transceiver 610 may include the modem subsystem 612 and the RF unit 614. The transceiver 610 may be configured to communicate bidirectionally with other devices such as the UE 115 and / or 500 and / or another core network element. The modem subsystem 612 may be configured to modulate and / or encode data according to an MCS (e.g., an LDPC decoding scheme, a turbo decoding scheme, a convolutional decoding scheme, a polarization decoding scheme, a digital beamforming scheme, etc.). The RF unit 614 may be configured to process (e.g., perform analog-to-digital conversion or digital-to-analog conversion, etc.) modulated / encoded data (e.g., PDCCH, PDSCH, BFD configuration, BWP configuration, BWP activation, BWP state transition trigger, WUS, BFD RS, SSB, CSI-RS, TRS) from the modem subsystem 612 (on outbound transmissions) or a transmission originating from another source such as the UE 115 or UE 500. The RF unit 614 may also be configured to perform analog beamforming in conjunction with the digital beamforming. Although shown as being integrated together in the transceiver 610, the modem subsystem 612 and / or the RF unit 614 may be separate devices coupled together at the BS 105 to enable the BS 105 to communicate with other devices.

[0105] The RF unit 614 may provide the modulated and / or processed data (e.g., data packets (or more generally, data messages that may contain one or more data packets and other information)) to the antenna 616 for transmission to one or more other devices. This may include, for example, transmitting information to complete attachment to a network and communication with a resident UE 115 or 500 in accordance with some aspects of the present disclosure. The antenna 616 may also receive data messages sent from other devices and provide the received data messages for processing and / or demodulation at the transceiver 610. The transceiver 610 may provide the demodulated and decoded data (e.g., PUSCH, PUCCH, beam measurements, beam failure indications) to the beam configuration / transmission module 608 for processing. The antenna 616 may include multiple antennas of similar or different designs to maintain multiple transmission links.

[0106] In one aspect, the BS 600 may include multiple transceivers 610 that implement different RATs (e.g., NR and LTE). In one aspect, the BS 600 may include a single transceiver 610 that implements multiple RATs (e.g., NR and LTE). In one aspect, the transceiver 610 may include various components, where different combinations of components may implement different RATs.

[0107] Figure 7 700 is a signaling diagram of a BFD method 700 according to some aspects of the present disclosure. The method 700 may be implemented between a BS (e.g., BS 105 and / or 600) and a UE (e.g., UE 115 and / or 500). The BS may implement aspects of the method 700 using one or more components (e.g., processor 602, memory 604, beam configuration / transmission module 608, transceiver 610, modem 612, and one or more antennas 616). The UE may implement aspects of the method 700 using one or more components (e.g., processor 502, memory 504, BFD module 508, transceiver 510, modem 512, and one or more antennas 516). The method 700 may be implemented using the same techniques as described above with respect to the respective embodiments. Figure 3 and Figure 4 The scheme 300 and 400 described have similar mechanisms. As shown, the method 700 includes a plurality of enumerated steps, but various embodiments of the method 700 may include additional steps before, after, and between the enumerated steps. In some aspects, one or more of the enumerated steps may be omitted or performed in a different order.

[0108] At action 705, BS 702 (e.g., BS 105 and / or 600) and UE 704 (e.g., UE 115 and / or 500) establish a connection for communication. Figure 1The BS may establish a connection with the UE using techniques such as random access and RRC connection setup procedures discussed above. In some cases, the connection may include two or more component carriers (CCs) operating in a carrier aggregation mode. For example, the connection may include a primary cell (PCell) and a secondary cell (SCell). In some aspects, the UE may establish a connection with the BS using one or more components such as a processor 502, a memory 504, a BFD module 508, a transceiver 510, a modem 512, and one or more antennas 516. The BS may establish a connection with the UE using one or more components such as a processor 602, a memory 604, a beam configuration / transmission module 608, a transceiver 610, a modem 612, and one or more antennas 616.

[0109] At action 710, BS 702 configures a BWP (e.g., BWP 310) for the connection. In some cases, BS 702 may configure up to about 4 BWPs for the connection. When there are multiple CCs associated with the connection, BS 702 may configure one or more BWPs for each CC. In some aspects, BS 702 may configure a BWP for UE 704 based on the capabilities of UE 704. In some aspects, the BS may configure the BWP using one or more components such as processor 602, memory 604, beam configuration / transmission module 608, transceiver 610, modem 612, and one or more antennas 616.

[0110] At action 715, BS 702 sends a BWP configuration to UE 704. The BWP configuration may be similar to BWP configuration 410. In some aspects, the BS may send the BWP configuration using one or more components such as processor 602, memory 604, beam configuration / transmission module 608, transceiver 610, modem 612, and one or more antennas 616.

[0111] At action 716, upon receiving the BWP configuration, the UE 704 stores information associated with the BWP configuration in a memory of the UE (eg, memory 504).

[0112] At action 720, BS 702 configures the BFD configuration. The BFD configuration may include various rules for determining which reference signals UE 704 may use for BFD RS monitoring and / or how to measure the BFD RS when the UE operates in a dormant BWP. In some aspects, BS 702 may configure UE 704 to not perform BFD in a dormant BWP. In some aspects, BS 702 may configure UE 704 to monitor BFD RS based on an explicit BFD RS configuration and / or an implicit BFD RS configuration for a specific BWP. In some aspects, the specific BWP may be a non-dormant BWP before UE 704 switches to the dormant BWP. In some aspects, the specific BWP may be a non-dormant BWP paired with a dormant BWP. In some aspects, the specific BWP may correspond to a dormant BWP having a CORESET configured with zero PDCCH candidates. In some aspects, the BS may configure the BFD configuration using one or more components such as a processor 602, a memory 604, a beam configuration / transmission module 608, a transceiver 610, a modem 612, and one or more antennas 616. Figure 8-11 The mechanism for determining the BFD RS for BFD is more fully described in .

[0113] At act 725, BS 702 sends the BFD configuration to UE 704. In some aspects, the BS may send the BFD configuration using one or more components such as processor 602, memory 604, beam configuration / transmission module 608, transceiver 610, modem 612, and one or more antennas 616.

[0114] At action 726, upon receiving the BFD configuration, the UE 704 stores information related to the BFD configuration (eg, rules for BFD RS monitoring) in a memory.

[0115] At action 730, the BS 702 determines one of the activated configured BWPs. In some aspects, the BS may utilize one or more components such as the processor 602, memory 604, beam configuration / transmission module 608, transceiver 610, modem 612, and one or more antennas 616 to determine the activated configured BWP.

[0116] At action 735, the BS 702 sends a BWP activation to the UE 704 to activate the determined BWP. In some aspects, the BS may send the BWP activation using one or more components such as the processor 602, the memory 604, the beam configuration / transmission module 608, the transceiver 610, the modem 612, and the one or more antennas 616.

[0117] At action 740, after the BWP is activated, the BS 702 communicates with the UE 704 in the active BWP. The communication may include PDCCH, PDSCH, PUSCH and / or PUCCH signals. In some aspects, the BS may communicate with the UE in the active BWP using one or more components such as the processor 602, the memory 604, the beam configuration / transmission module 608, the transceiver 610, the modem 612, and one or more antennas 616. The UE may communicate with the BS in the active BWP using one or more components such as the processor 502, the memory 504, the BFD module 508, the transceiver 510, the modem 512, and one or more antennas 516.

[0118] At action 750, the BS 702 switches the UE 704 to operate in the sleep mode. In some aspects, the BS may utilize one or more components such as the processor 602, the memory 604, the beam configuration / transmission module 608, the transceiver 610, the modem 612, and the one or more antennas 616 to switch the UE 704 to operate in the sleep mode. In some aspects, as will be discussed more fully below, the BS 702 may configure the UE 704 to operate in the sleep BWP via RRC configuration, downlink control information (DCI) signaling (e.g., in the PDCCH), medium access control-control element (MAC-CE) signaling, and / or a wake-up signal (WUS).

[0119] At action 755, when the UE 704 operates in the dormant BWP, the BS 702 sends the BFD RS according to the rules in the BFD configuration to facilitate BFD at the UE 704. In some aspects, the BS may utilize one or more components (such as the processor 602, the memory 604, the beam configuration / transmission module 608, the transceiver 610, the modem 612, and the one or more antennas 616) to send the BFD RS to the UE based on the BFD configuration.

[0120] At action 760, the UE 704 performs BFD RS monitoring based on the rules in the BFD configuration. In some aspects, the UE may utilize one or more components (such as the processor 502, the memory 504, the BFD module 508, the transceiver 510, the modem 512, and the one or more antennas 516) to retrieve the BFD rules from the memory and monitor the BFD RS for BFD based on the rules indicated by the BFD configuration.

[0121] Figure 8-11Various mechanisms are shown for a BS (eg, BS 105, 600, and / or 702) to configure a UE (eg, UE 115, 500, and / or 704) to perform BFD RS monitoring when the UE operates in a dormant BWP (eg, BWP 310a).

[0122] Figure 8 800 according to some aspects of the present disclosure. Aspects of the method 800 may be performed by a computing device (e.g., a processor, processing circuitry, and / or other suitable components) of a wireless communication device or other suitable means for performing the steps. For example, a wireless communication device such as the UE 115, 500, and / or 702 may utilize one or more components (e.g., a processor 502, a memory 504, a BFD module 508, a transceiver 510, a modem 512, and one or more antennas 516) to perform the steps of the method 800. The method 800 may be implemented in the same manner as described above with reference to the respective embodiments. Figure 3 and Figure 4 Similar mechanisms in the discussed schemes 300 and 400. As shown, the method 800 includes a plurality of enumerated steps, but aspects of the method 800 may include additional steps before, after, and between the enumerated steps. In some aspects, one or more of the enumerated steps may be omitted or performed in a different order.

[0123] In method 800, a BS (e.g., BS 105, 600, and / or 702) may configure a UE (e.g., UE 115, 500, and / or 704) to perform BFD in a dormant BWP (e.g., BWP 310a). If the UE is configured with an explicit BFD RS for the dormant BWP, the BS may configure the UE to perform BFD. Otherwise, the UE may not perform BFD in the dormant BWP. The explicit BFD RS configuration may indicate resources (in frequency and time) where the BS may send a reference signal that the UE may monitor for BFD.

[0124] At block 810, the UE operates in a sleep mode for a cell of a wireless communication network. The network may be similar to network 100. In some aspects, the cell may be a PCell. In some aspects, the cell may be an SCell. The UE may determine to operate in a sleep mode in a sleep BWP based on a configuration from the BS. In some aspects, the UE may utilize one or more components (such as a processor 502, a memory 504, a BFD module 508, a transceiver 510, a modem 512, and one or more antennas 516) to operate in a sleep mode, for example, for power saving. The UE may configure at least one of the RF components in the transceiver 510 to operate in a low power state or a power-off state.

[0125] At block 820, the UE determines whether the UE is configured with an explicit BFD RS for the dormant BWP. For example, the explicit BFD RS configuration may include a list of one or more resources (in frequency and time) where the BS may send reference signals (e.g., SSB, CSI-RS, and / or TRS), and the reference signals may be used for BFD. In some aspects, the UE may utilize one or more components (such as the processor 502, the memory 504, the BFD module 508, the transceiver 510, the modem 512, and the one or more antennas 516) to determine whether the UE is configured with an explicit BFD RS for the dormant BWP. If the UE determines that the explicit BFD RS for the dormant BWP is not configured, the UE may proceed to block 825.

[0126] At block 825, the UE refrains from performing BFD RS monitoring. In some aspects, the UE may utilize one or more components such as the processor 502, memory 504, BFD module 508, transceiver 510, modem 512, and one or more antennas 516 to disable BFD RS monitoring operations at the UE.

[0127] Returning to block 820, if the UE determines that the UE is configured with an explicit BFD RS for the dormant BWP, the UE may proceed to block 830. At block 830, the UE monitors the BFD RS according to the explicit BFD RS configuration. In some aspects, the UE may utilize one or more components (such as the processor 502, the memory 504, the BFD module 508, the transceiver 510, the modem 512, and the one or more antennas 516) to perform BFD RS monitoring according to the BFD RS in the explicit BFD RS configuration. The UE may configure the transceiver 510 and / or the one or more antennas 516 to monitor the BFD RS in a certain spatial direction according to a spatial parameter (e.g., a QCL parameter) associated with the BFD RS.

[0128] When the UE is configured with an explicit BFD RS, the UE may monitor and measure the BFD RS that is QCLed to the CORESET (e.g., CORESET 320) in a specific BWP, as shown in block 840. In some aspects, the specific BWP may correspond to a non-dormant BWP before the UE operates in a dormant BWP, as shown in block 842. As an example, the non-dormant BWP may be configured with a configuration similar to Figure 44. The UE may look up the TCI state (e.g., TCI state 0 for CORESET #0) from the CORESET configuration 430 and look up the reference signal (e.g., SSB index #n) indicated by the TCI state in the TCI state table 440. The UE may monitor the explicitly configured BFD RS for the QCL with the SSB index #n indicated by TCI state 0. Additionally or alternatively, the UE may perform a similar lookup for TCI state 1 of CORESET #0 and monitor the explicitly configured BFD RS for the QCL with the CSI-RS index #k indicated by TCI state 1. In some aspects, when there is more than one QCL type for the CORESET, the UE may select the configured BFD RS for the CORESET QCL in type D. Thus, referring to the same example, the UE may monitor the configured BFD RS for the SSB index #n QCL indicated by TCI state 0 based on the QCL type D indication for SSB index #n. Therefore, before the UE switches to the dormant BWP, the BS may send one or more BFD RSs (eg, SSB, CSI-RS, and / or TRS) according to the QCL relationship indicated by the CORESET in the non-dormant BWP.

[0129] In some other aspects, the particular BWP may correspond to a non-dormant BWP that is paired with a dormant BWP, as shown at block 844. Figure 3 In the example shown, the BS may configure a non-dormant BWP 310b paired with a dormant BWP 310a. Thus, for BFD, the UE may monitor a reference signal QCLed to the CORESET 320 in the BWP 310b. The UE may determine the BFD RS for monitoring using a substantially similar mechanism as described for block 842. The BS may send one or more BFD RS (e.g., SSB, CSI-RS, and / or TRS) based on the QCL relationship indicated by the CORESET in the paired non-dormant BWP.

[0130] In some other aspects, the specific BWP may correspond to a dormant BWP, as shown in block 846. For example, the BS may configure a CORESET for the dormant BWP so that the UE may determine the BFD RS for monitoring using the QCL relationship configured for the CORESET. However, the BS may configure zero PDCCH candidates for the CORESET at each aggregation level and each search space so that the UE may not perform PDCCH monitoring in the dormant BWP. The BS may send one or more BFD RSs (e.g., SSBs, CSI-RSs, and / or TRSs) according to the QCL relationship indicated by the CORESET in the dormant BWP.

[0131] Fig. 9 900 according to some aspects of the present disclosure. Aspects of the method 900 may be performed by a computing device (e.g., a processor, processing circuitry, and / or other suitable components) of a wireless communication device or other suitable means for performing the steps. For example, a wireless communication device such as the UE 115, 500, and / or 702 may utilize one or more components (e.g., a processor 502, a memory 504, a BFD module 508, a transceiver 510, a modem 512, and one or more antennas 516) to perform the steps of the method 900. The method 900 may be implemented in the same manner as described above with reference to the respective embodiments. Figure 3 and Figure 4 Similar mechanisms are discussed in schemes 300 and 400. As shown, the method 900 includes a plurality of enumerated steps, but aspects of the method 800 may include additional steps before, after, and between the enumerated steps. In some aspects, one or more of the enumerated steps may be omitted or performed in a different order.

[0132] In method 900, a BS (e.g., BS 105, 600, and / or 702) may configure a UE (e.g., UE 115, 500, and / or 704) to perform BFD in a dormant BWP (e.g., BWP 310a). If the UE is configured with an implicit BFD RS for the dormant BWP, the BS may configure the UE to perform BFD. Otherwise, the UE may not perform BFD in the dormant BWP. The implicit BFD RS may refer to a reference signal indicated by the TCI state of the CORESET in a specific BWP.

[0133] In general, method 900 includes features similar to method 800 in many respects. For example, blocks 910, 925, 942, 944, and 946 are similar to blocks 810, 825, 842, 844, and 846, respectively. Therefore, for the sake of brevity, the details of these blocks will not be repeated here. Please refer to the corresponding description above.

[0134] At block 920, the UE determines whether the UE is configured with one or more implicit BFD RSs for the dormant BWP. For example, the BS may configure the UE to monitor a reference signal indicated by the TCI state of the CORESET in a particular BWP. In some aspects, the UE may utilize one or more components (such as the processor 502, the memory 504, the BFD module 508, the transceiver 510, the modem 512, and the one or more antennas 516) to determine whether the UE is configured with one or more implicit BFD RSs for the dormant BWP. If the UE determines that the UE is configured with one or more implicit BFD RSs for the dormant BWP, the UE may proceed to block 930. Otherwise, the UE may proceed to block 925 and suppress BFD RS monitoring.

[0135] At block 930, the UE monitors the BFD RS according to the implicit BFD RS configuration. In some aspects, the UE may utilize one or more components (such as the processor 502, the memory 504, the BFD module 508, the transceiver 510, the modem 512, and the one or more antennas 516) to perform BFD RS monitoring according to the BFD RS in the implicit BFD RS configuration. The UE may configure the transceiver 510 and / or the one or more antennas 516 to monitor the BFD RS in a certain spatial direction according to a spatial parameter (e.g., a QCL parameter) associated with the BFD RS.

[0136] When the UE is configured with an implicit BFD RS, the UE may monitor and measure a reference signal (e.g., BFD RS) indicated by the TCI state of the CORESET in a specific BWP, as shown in block 940. Similar to block 840, the specific BWP may correspond to a non-dormant BWP before the UE operates in a dormant BWP, as shown in block 942. As an example, the non-dormant BWP may be configured with a signal similar to Figure 44. The UE may look up the TCI state (e.g., TCI state 0 for CORESET#0) from the CORESET configuration 430 and look up the reference signal (e.g., SSB index #n) indicated by the TCI state in the TCI state table 440. The UE may monitor the SSB identified by index #n indicated by TCI state 0 for BFD. Additionally or alternatively, the UE may perform a similar lookup for TCI state 1 of CORESET#0 and monitor the CSI-RS identified by index #k indicated by TCI state 1 for BFD. In some aspects, when there is more than one reference signal in the TCI state for the CORESET, the UE may select a reference signal with QCL type D in the TCI state for BFD monitoring. For example, if TCI state 0 of CORESET#0 may indicate a QCL type A reference signal and a QCL type D reference signal, the UE may monitor the QCL type D reference signal. Therefore, before the UE switches to the dormant BWP, the BS may send one or more BFD RSs (eg, SSB, CSI-RS, and / or TRS) according to the reference signal indicated by the TCI state of the CORESET in the non-dormant BWP.

[0137] In some other aspects, the particular BWP may correspond to a non-dormant BWP that is paired with a dormant BWP, as shown at block 944, which is similar to block 844. Figure 3 In the example shown, the BS may configure a non-dormant BWP 310b paired with a dormant BWP 310a. Thus, for BFD, the UE may monitor a reference signal indicated by the TCI state of the CORESET 320 in the BWP 310b. The UE may determine the BFD RS for monitoring using a substantially similar mechanism as described for block 942. The BS may send one or more BFD RSs (e.g., SSB, CSI-RS, and / or TRS) based on the reference signal indicated by the TCI state of the CORESET in the paired non-dormant BWP.

[0138] In other aspects, the particular BWP may correspond to a dormant BWP, as shown in block 946, which is similar to block 846. For example, the BS may configure a CORESET for the dormant BWP so that the UE may monitor the reference signal indicated by the TCI state of the COREST in the dormant BWP. Similarly, the BS may configure zero PDCCH candidates for the CORESET at each aggregation level and each search space so that the UE may not perform PDCCH monitoring in the dormant BWP. In other words, even if a CORESET is configured for the dormant BWP, the UE may determine that no search space or PDCCH candidates are monitored in the dormant BWP. In some aspects, the BS may configure a CORESET (associated with a certain TCI state) for the UE in the dormant BWP to facilitate BFD RS monitoring at the UE, but may suppress the configuration or allocation of any PDCCH search space associated with the CORESET in the dormant BWP (e.g., no common search space). A common search space is a search shared across all UEs. Thus, the UE may receive a CORESET configuration for a dormant BWP, but may not receive any PDCCH search space configuration for the dormant BWP (e.g., no common search space configuration), and therefore may not perform PDCCH monitoring in the dormant BWP. In this regard, the BS may configure the UE with a PDCCH configuration including a CORESET configuration (for one or more CORESETs in the BWP), but may not include any other PDCCH monitoring or search space parameters. In some aspects, when there is more than one reference signal in a TCI state for a CORESET, the UE may select a reference signal with QCL type D in a TCI state for BFD monitoring. For example, if TCI state 0 of CORESET#0 may indicate a QCL type A reference signal and a QCL type D reference signal, the UE may monitor the QCL type D reference signal. In other words, the BS may send a QCL type A reference signal and a QCL type D reference signal in a dormant BWP, and may receive a beam recovery request from the UE based on the QCL type D reference signal (monitored by the UE). Therefore, the BS may transmit one or more BFD RSs (eg, SSB, CSI-RS, and / or TRS) according to a reference signal indicated by the TCI state of the CORESET in the dormant BWP.

[0139] Fig.101 is a flow chart of a BFD method 1000 according to some aspects of the present disclosure. Aspects of the method 1000 may be performed by a computing device (e.g., a processor, a processing circuit, and / or other suitable components) of a wireless communication device or other suitable means for performing the steps. For example, a wireless communication device such as the UE 115, 500, and / or 702 may utilize one or more components (such as a processor 502, a memory 504, a BFD module 508, a transceiver 510, a modem 512, and one or more antennas 516) to perform the steps of the method 1000. The method 1000 may be implemented in the same manner as described above with reference to the respective embodiments. Figure 3 and Figure 4 Similar mechanisms in the schemes 300 and 400 discussed above, and / or respectively refer to Figure 8 and 9 Similar mechanisms are discussed in methods 800 and 900. As shown, the method 1000 includes a plurality of enumerated steps, but aspects of the method 1000 may include additional steps before, after, and between the enumerated steps. In some aspects, one or more of the enumerated steps may be omitted or performed in a different order.

[0140] In method 1000, a BS (e.g., BS 105, 600, and / or 702) may configure a UE (e.g., UE 115, 500, and / or 704) to perform BFD in a dormant BWP (e.g., BWP 310a). If the UE is configured with an explicit BFDRS for the dormant BWP, the BS may configure the UE to perform BFD. Otherwise, the UE may perform BFD based on an implicit BFD configuration.

[0141] At block 1010 , the UE operates in a dormant mode for a cell of a wireless communication network, for example by performing operations similar to those at block 810 .

[0142] At block 1020, the UE determines whether the UE is configured with an explicit BFD RS for the dormant BWP. The explicit BFD RS may be configured with the same Figure 8 In some aspects, the UE may utilize one or more components (such as the processor 502, the memory 504, the BFD module 508, the transceiver 510, the modem 512, and the one or more antennas 516) to determine whether the UE is configured with an explicit BFD RS for the dormant BWP. If the UE determines that the UE is configured with an explicit BFD RS for the dormant BWP, the UE may proceed to block 1030.

[0143] At block 1030, the UE may perform BFD RS monitoring based on the explicit BFD RS, for example, as described above with reference to Figure 8 As discussed in blocks 830 and 840.

[0144] Returning to block 1020, if the UE determines that the UE is not configured with an explicit BFD RS, the UE proceeds to block 1025. At block 1025, the UE may perform BFD RS monitoring based on the implicit BFD RS configuration, for example, as described above with reference to Fig. 9 As discussed in blocks 930 and 940.

[0145] Fig.11 A BFD RS measurement scheme 1100 according to some aspects of the present disclosure is shown. The scheme 1100 may be employed by a BS (such as BS 105) and a UE (such as UE 115) in a network (such as network 100). In particular, the BS (e.g., BS 105) may configure the UE (e.g., UE 115) to perform BFD RS measurements, as shown in the scheme 1100. Fig.11 In FIG. 1100 , the y-axis represents frequency in some arbitrary units. The same frequency band configuration as in the scheme 300 is used to describe the scheme 1100 , and the same reference numerals may be used for simplicity.

[0146] The BS may send various reference signals in frequency band 301. For example, the BS may send SSBs in frequency band 301 to facilitate system synchronization and network access. Additionally, the BS may send CSI-RSs in frequency band 301 to enable the UE to perform channel measurements and determine pre-coding feedback to help the BS determine pre-coding for DL ​​beamforming. Furthermore, the BS may send TRSs in frequency band 301 to facilitate time and / or frequency tracking at the UE. Each of the SSBs, CSI-RSs, and TRSs may span a specific frequency portion in frequency band 301.

[0147] like Fig.11 As shown, the BS may transmit reference signal 1110, reference signal 1120, and reference signal 1130, each across a specific frequency band. Reference signals 1110, 1120, 1130 may include SSB, CSI-RS, and / or TRS. Depending on the BWP configuration, reference signals 1110, 1120, and / or 1130 may be completely within a BWP, partially within a BWP, or outside a BWP. Figure 3, the BS may configure BWP 310a as a dormant BWP for the UE. Therefore, reference signal 1110 is completely within dormant BWP 310a. Reference signal 1130 is partially within dormant BWP 310a. Reference signal 1110 is outside dormant BWP 310a. Although reference signals 1110, 1120, and 1130 are shown as occupying contiguous frequencies in frequency band 301, reference signals 1110, 1120, and / or 1130 may occupy non-contiguous frequencies in frequency band 301. In general, reference signals may be sent in one or more contiguous or distributed PRBs (e.g., RB 210).

[0148] The BS may configure the UE to perform BFD RS measurement using reference signals 1110, 1120, and / or 1130 in various ways. The BS may configure the UE with a BFD RS corresponding to reference signals 1110, 1120, or 1130. The configuration may be as described above with reference to Figure 8 and Fig. 9 The discussed explicit configuration or implicit configuration. In some aspects, if the BFD RS (e.g., reference signal 1110) is completely within the dormant BWP 310a, the BS can configure the UE to measure the BFD RS. Therefore, the UE can utilize one or more components (such as processor 502, memory 504, BFD module 508, transceiver 510, modem 512, and one or more antennas 516) to receive the BFD RS and determine measurements for the BFD RS (e.g., reference signal received power (RSRP), reference signal received quality (RSRQ), and / or channel quality indicator (CQI)).

[0149] In some other aspects, the BS may configure the UE to measure a portion of the BFD RS (e.g., reference signal 1120) within the dormant BWP 310a. In some cases, the BS may configure the UE to perform measurements on a portion of the BFD RS within the dormant BWP 310a (e.g., portion 1122) and exclude measurements on a portion of the BFD RS outside the dormant BWP 310a (e.g., portion 1124). Thus, the UE may utilize one or more components (such as the processor 502, the memory 504, the BFD module 508, the transceiver 510, the modem 512, and the one or more antennas 516) to receive the portion of the BFD RS within the dormant BWP 310a and determine measurements on the portion of the BFD RS in the dormant BWP 310a. In some other instances, the BS may configure the UE to perform measurements on the entire BFD RS including the portion outside the dormant BWP 310a. Thus, the UE may utilize one or more components (such as the processor 502, the memory 504, the BFD module 508, the transceiver 510, the modem 512, and the one or more antennas 516) to receive the entire BFD RS (including the portion 1122 in the dormant BWP 310a and the portion 1124 outside the dormant BWP 310b) and determine measurements for the entire BFD RS. In some instances, the UE may configure the RF components (e.g., filters, gain stages, and / or ADCs) to operate at a wider bandwidth extending outside the dormant BWP 310a.

[0150] In some other aspects, the BS may configure the UE with a BFD RS (e.g., reference signal 1130) outside the dormant BWP 310a. In some instances, the BS may configure the UE to exclude measurements of the BFD RS outside the dormant BWP 310a. In some other instances, the BS may configure the UE to extend its frequency band outside the dormant BWP 310a so that the UE can determine measurements for the BFD RS. Thus, the UE may configure the RF components (e.g., filters, gain stages, and / or ADCs) to operate at a wider bandwidth including the BWP where the BFD RS is located, and utilize one or more components (such as the processor 502, memory 504, BFD module 508, transceiver 510, modem 512, and one or more antennas 516) to receive the BFD RS outside the dormant BWP 310b and determine measurements for the BFD RS. In some instances, the BS may configure the UE to switch to the BWP where the BFD RS is located (e.g., BWP 310b) to perform BFD RS measurements. Therefore, the UE can configure the RF components (e.g., filters, gain stages and / or ADCs) to switch to the BWP 310b where the BFD RS is located, and utilize one or more components (such as a processor 502, a memory 504, a BFD module 508, a transceiver 510, a modem 512, and one or more antennas 516) to receive the BFD RS in the dormant BWP 310b and determine measurements for the BFD RS.

[0151] As described above, the BS (e.g., BS105, 600, and / or 702) may configure the UE (e.g., UE 115, 500, and / or 704) to operate in sleep mode via RRC signaling, DCI signaling, MAC-CE signaling, and / or WUS. Using DCI signaling, MAC-CE signaling, and / or WUS to indicate the sleep mode may allow the BS to dynamically configure the UE to switch between sleep mode and non-sleep mode or switch the BWP between a sleep BWP and a non-sleep BWP.

[0152] Figures 12A-12C Various mechanisms are shown for a BS (eg, BS 105, 600, and / or 702) to configure a UE (eg, UE 115, 500, and / or 704) to transition between a dormant state and a non-dormant state for a configured BWP. Fig. 12A A dormant BWP configuration scheme 1202 is shown in accordance with some aspects of the present disclosure. Fig. 12B A dormant BWP configuration scheme 1204 is shown in accordance with some aspects of the present disclosure. Fig. 12C A dormant BWP configuration scheme 1206 is shown in accordance with some aspects of the present disclosure.

[0153] In each of the schemes 1202, 1204, and 1206, the BS may configure a BWP for the UE, and may configure a non-sleep state 1210 for the BWP, for example, via RRC configuration. The UE may perform PDCCH monitoring in the non-sleep state 1210, transmit UL and / or DL ​​communications with the BS, and / or perform BFD in the configured BWP. The BS may send a trigger 1212 to the UE to convert the BWP to a sleep state 1220. The UE may not monitor the PDCCH in the sleep BWP, but may perform BFD as described herein. In some aspects, the trigger 1212 may be a DCI message. In some other aspects, the trigger 1212 may be a MAC-CE message. In other aspects, the trigger 1212 may be a WUS. For example, for power saving, the BS may configure the UE to operate in a power saving mode that cycles through a wake-up / sleep cycle. The BS may configure the UE 704 to monitor the WUS when operating in the power saving mode. The BS may send a WUS to the UE to wake up the UE from the power saving mode. The BS may include a trigger 1212 in the WUS.

[0154] In scheme 1202, the transition to dormant state 1220 may be permanent. In other words, trigger 1212 may permanently override the RRC configured BWP. When operating in the configured BWP, the UE may remain in the dormant state.

[0155] In scheme 1204, the UE may operate in a sleep state 1220 in an RRC configured BWP for a specific duration. In some aspects, the duration may be predetermined, for example, based on a certain wireless communication protocol standard. In some aspects, the duration may be configurable. For example, the BS may indicate the duration in a trigger 1212 or in a separate configuration message. The UE may configure an expiration time for a timer based on the duration configured for the sleep state 1220. Upon time expiration trigger 1222, the UE may transition back to a non-sleep state.

[0156] In scheme 1206, the UE may remain in the sleep state 1220 until receiving the next trigger from the BS. For example, the BS may send a trigger 1224 to switch the UE from the sleep state 1220 back to the non-sleep state 1210. The trigger 1224 may be substantially similar to the trigger 1212. For example, the trigger 1224 may be another DCI, MAC-CE, or WUS.

[0157] In some aspects, when the trigger 1212 indicates that a non-dormant BWP (e.g., BWP 310b) is paired with a dormant BWP (e.g., the RRC-configured BWP transitions to the dormant state 1220) and the UE is configured with an explicit BFD RS configuration, the UE may monitor and measure the BFD RS of the CORESET QCL in the paired non-dormant BWP. In some aspects, when the trigger 1212 indicates that a non-dormant BWP (e.g., BWP 310b) is paired with a dormant BWP (e.g., the RRC-configured BWP transitions to the dormant state 1220) and the UE is configured with an implicit BFD RS configuration, the UE may monitor and measure the BFD RS indicated in the TCI state of the CORESET in the paired non-dormant BWP.

[0158] Fig.13 1300 according to some aspects of the present disclosure. Aspects of the method 1300 may be performed by a computing device (e.g., a processor, processing circuitry, and / or other suitable components) of a wireless communication device or other suitable means for performing the steps. For example, a wireless communication device such as the UE 115, 500, and / or 704 may utilize one or more components (e.g., a processor 502, a memory 504, a BFD module 508, a transceiver 510, a modem 512, and one or more antennas 516) to perform the steps of the method 1300. The method 1300 may be implemented in the same manner as described above with reference to the respective embodiments. Figure 3 , 4 , 11, 12A, 12B and / or 12C discussed in schemes 300, 400, 1100, 1202, 1204 and / or 1206, and / or the same mechanisms as those described above, respectively. Figure 7 , 8 , 9, 12A, 12B and / or 12C discussed in the methods 700, 800, 900 and / or 1000. As shown, the method 1300 includes a plurality of enumerated steps, but aspects of the method 1300 may include additional steps before, after and between the enumerated steps. In some aspects, one or more of the enumerated steps may be omitted or performed in a different order.

[0159] At block 1310, a wireless communication device (e.g., UE 115, 500, and / or 704) determines that a cell of a wireless communication network is operating in a sleep mode. The wireless communication network may be similar to network 100. In some aspects, a cell of the network includes a secondary cell. In some aspects, a cell of the network includes a primary cell. In some aspects, a wireless communication device may utilize one or more components (such as a processor 502, a memory 504, a BFD module 508, a transceiver 510, a modem 512, and one or more antennas 516) to determine that the cell is operating in a sleep mode. In some aspects, the wireless communication device may determine that the cell is operating in a sleep mode based on a configuration or trigger received from a BS (e.g., BS105, 600, and / or 702).

[0160] At block 1320, the wireless communication device operates in a sleep mode for a cell of the wireless communication network. Operating in the sleep mode includes performing BFD according to a BFD configuration.

[0161] In some aspects, performing BFD at block 1320 may include suppressing performing BFD in a dormant BWP (e.g., BWP 310a). In some aspects, performing BFD at block 1320 may include detecting one or more BFD RSs in a dormant BWP. In some aspects, the wireless communication device may also receive a CORESET configuration for the dormant BWP, wherein monitoring one or more BFDRSs is further based on the CORESET configuration for the dormant BWP. When operating in dormant mode, the wireless communication device may operate in a dormant BWP. The CORESET configuration may indicate one or more CORESETs in the dormant BWP. However, any CORESET in the dormant BWP is not available for monitoring by the wireless communication device. In some cases, the wireless communication device may determine that there is no search configuration (e.g., a common search space configuration) for the dormant BWP. In some aspects, the CORESET may include zero PDCCH candidates per aggregation level and per search space.

[0162] In some aspects, performing BFD at block 1320 may include monitoring one or more BFD RSs in the BWP when the BFD configuration explicitly indicates one or more BFD RSs, e.g., as described above with reference to Figure 8As discussed in method 800. In some aspects, performing BFD at block 1320 may include refraining from performing BFD when the BFD configuration fails to explicitly indicate one or more BFD RSs. In some aspects, one or more BFD RSs with a CORESET QCL are monitored. In some aspects, the wireless communication device may further determine that the first QCL type and the second QCL type are associated with a CORESET, wherein monitoring the one or more BFD RSs with the CORESET QCL includes monitoring the one or more BFD RSs with the CORESET QCL based on the second QCL type. In some aspects, the second QCL type includes QCL type D.

[0163] In some aspects, performing BFD at block 1320 may include monitoring one or more BFD RSs in the BWP when the BFD configuration implicitly indicates one or more BFD RSs, e.g., as described above with reference to Fig. 9 as discussed in method 900. In some aspects, performing BFD at block 1320 may include refraining from performing BFD when the BFD configuration fails to implicitly indicate one or more BFD RSs. In some aspects, monitoring the one or more BFD RSs includes monitoring one or more BFD RSs associated with a TCI state of the CORESET. In some aspects, the wireless communication device may further determine that the first QCL type and the second QCL type are associated with the TCI state of the CORESET, wherein monitoring the one or more BFD RSs associated with the TCI state of the CORESET includes monitoring one or more BFD RSs associated with the TCI state of the CORESET based on the second QCL type. In some aspects, the second QCL type includes QCL type D.

[0164] In some aspects, performing BFD at block 1320 may include at least one of: monitoring, by the wireless communication device, one or more explicit BFD RSs in the BWP when the BFD configuration explicitly indicates one or more explicit BFD RSs; or monitoring, by the wireless communication device, one or more implicit BFD RSs in the BWP when the BFD configuration fails to explicitly indicate one or more explicit BFD RSs, e.g., as described above with reference to Fig.10 As discussed in method 1000 .

[0165] In some aspects, performing BFD at block 1320 may include monitoring one or more BFD RSs in a BWP, wherein the BWP includes a BWP previously used by the wireless communication device to operate in the sleep mode, for example, as described above with reference to Figure 8 and 9 Discussed in blocks 842 and 942.

[0166] In some aspects, performing BFD at block 1320 may include monitoring one or more BFD RSs in a BWP, wherein the BWP includes a first BWP used by the wireless communication device before operating in the sleep mode, and a sleep BWP used when the wireless communication device operates in the sleep mode, e.g., as described above with reference to each of the foregoing. Figure 8 and 9 Discussed in blocks 844 and 944.

[0167] In some aspects, performing BFD at block 1320 may include monitoring one or more BFD RSs (e.g., reference signal 1110) entirely within a dormant BWP. In some other aspects, performing BFD at block 1320 may include monitoring one or more BFD RSs (e.g., reference signal 1120) partially within a dormant BWP, wherein a first portion of each of the one or more BFD RSs is within the dormant BWP and a second portion of each of the one or more BFD RSs is outside the dormant BWP. In some other aspects, performing BFD at block 1320 may include measuring at least one parameter of the first portion of each of the one or more BFD RSs. In some aspects, performing BFD at block 1320 may include measuring at least one parameter of each of the one or more BFD RSs based on the first and second portions. In some aspects, performing BFD at block 1320 may include refraining from monitoring one or more BFD RSs outside of a dormant BWP. In some aspects, performing BFD at block 1320 may include monitoring one or more BFD RSs (e.g., reference signal 1130) outside of a dormant BWP.

[0168] In some aspects, the wireless communication device may also receive a BFD configuration. In some aspects, receiving the BFD configuration includes receiving the BFD configuration via at least one of a DCI, a MAC-CE, or a WUS. In some aspects, the BFD configuration indicates that the first BWP is associated with a sleep mode and the second BWP is associated with a non-sleep mode. In some aspects, the BFD configuration has a first duration. In some aspects, the first duration is permanent. In some aspects, the first duration is based on at least one of a timer or a predetermined value. In some aspects, the first duration is based on the number of transitions between the sleep mode and the non-sleep mode.

[0169] Fig.141400 according to some aspects of the present disclosure. Aspects of the method 1400 may be performed by a computing device (e.g., a processor, a processing circuit, and / or other suitable components) of a wireless communication device or other suitable means for performing the steps. For example, a wireless communication device such as the BS 105, 600, and / or 702 may utilize one or more components (e.g., a processor 602, a memory 604, a beam configuration and transmission module 608, a transceiver 610, a modem 612, and one or more antennas 616) to perform the steps of the method 1400. The method 1400 may be implemented in the same manner as described above with reference to the respective embodiments. Figure 3 , 4 , 11, 12A, 12B and / or 12C discussed in schemes 300, 400, 1100, 1202, 1204 and / or 1206, and / or the same mechanisms as those described above, respectively. Figure 7 , 8 , 9, 12A, 12B and / or 12C discussed in the methods 700, 800, 900 and / or 1000. As shown, the method 1400 includes a plurality of enumerated steps, but aspects of the method 1400 may include additional steps before, after and between the enumerated steps. In some aspects, one or more of the enumerated steps may be omitted or performed in a different order.

[0170] At block 1410, a first wireless communication device (e.g., BS 105, 600, and / or 702) determines that a second wireless communication device (e.g., UE 115, 500, and / or 704) is operating in sleep mode for a cell of a wireless communication network. The wireless communication network may be similar to network 100. In some aspects, a cell of the network includes a secondary cell. In some aspects, a cell of the network includes a primary cell. In some aspects, the first wireless communication device may utilize one or more components (such as a processor 602, a memory 604, a beam configuration and transmission module 608, a transceiver 610, a modem 612, and one or more antennas 616) to determine that the second wireless communication device is operating in sleep mode. In some aspects, the first wireless communication device may determine that the second wireless communication device is operating in sleep mode based on a configuration or trigger sent by the first wireless communication device.

[0171] At block 1420, the first wireless communication device transmits one or more BFD RSs according to the BFD configuration in response to determining that the second wireless communication device is operating in the sleep mode. In some aspects, the first wireless communication device may transmit the one or more BFD RSs using one or more components such as the processor 602, the memory 604, the beam configuration and transmission module 608, the transceiver 610, the modem 612, and the one or more antennas 616.

[0172] In some aspects, sending the BFD RS at block 1420 includes sending one or more BFD RS in a dormant BWP (e.g., BWP 310a). In some aspects, the first wireless communication device may also send a CORESET configuration for the dormant BWP, wherein sending the one or more BFD RS at block 1420 is further based on the CORESET configuration for the dormant BWP.

[0173] In some aspects, the first wireless communication device also sends a BFD configuration to the second wireless communication device. In some aspects, the BFD configuration explicitly indicates one or more BFD RSs, such as, for example, as described above with reference to Figure 8 As discussed in method 800. In some aspects, the BFD configuration implicitly indicates one or more BFD RSs, e.g., as described above with reference to Fig. 9 As discussed in method 900. In some aspects, sending the BFD configuration includes sending the BFD configuration to the second wireless communication device via at least one of a DCI, a MAC-CE, or a WUS.

[0174] In some aspects, sending one or more BFD RS at block 1420 includes sending one or more BFD RS with a CORESET QCL. In some aspects, sending one or more BFD RS at block 1420 includes sending one or more BFD RS based on a TCI state of the CORESET.

[0175] In some aspects, sending the one or more BFD RSs at block 1420 includes sending the one or more BFD RSs in a BWP, wherein the BWP includes a BWP used by the second wireless communication device before operating in the sleep mode, e.g., as described above with reference to Figure 8 and 9 Discussed in blocks 842 and 942.

[0176] In some aspects, sending the one or more BFD RSs at block 1420 includes sending the one or more BFD RSs in a BWP, wherein the BWP includes a BWP used by the second wireless communication device before operating in the sleep mode and a sleep BWP used by the second wireless communication device when operating in the sleep mode, e.g., as described above with reference to Figure 8 and 9 Discussed in blocks 844 and 944.

[0177] In some aspects, sending the one or more BFD RSs at block 1420 includes sending the one or more BFD RSs (e.g., reference signal 1110) entirely within the dormant BWP. In some aspects, sending the one or more BFD RSs at block 1420 includes sending the one or more BFD RSs (e.g., reference signal 1120) partially within the dormant BWP, wherein a first portion of each of the one or more BFD RSs is within the dormant BWP and a second portion of each of the one or more BFD RSs is outside the dormant BWP. In some aspects, sending the one or more BFD RSs at block 1420 includes sending the one or more BFD RSs (e.g., reference signal 1130) outside the dormant BWP.

[0178] In some aspects, the BFD configuration indicates that the first BWP is associated with a sleep mode and the second BWP is associated with a non-sleep mode. In some aspects, the BFD configuration has a first duration. In some aspects, the first duration is permanent. In some aspects, the first duration is based on at least one of a timer or a predetermined value. In some aspects, the first duration is based on a number of transitions between the sleep mode and the non-sleep mode.

[0179] Fig.15 1 is a flow chart of a wireless communication method 1500 according to some aspects of the present disclosure. Aspects of the method 1500 may be performed by a computing device (e.g., a processor, a processing circuit, and / or other suitable components) of a wireless communication device or other suitable means for performing the steps. For example, a wireless communication device such as the UE 115, 500, and / or 704 may utilize one or more components (such as a processor 502, a memory 504, a BFD module 508, a transceiver 510, a modem 512, and one or more antennas 516) to perform the steps of the method 1500. The method 1500 may be implemented in the same manner as described above with reference to the respective embodiments. Figure 3 , 4 , 11, 12A, 12B and / or 12C discussed in schemes 300, 400, 1100, 1202, 1204 and / or 1206, and / or the same mechanisms as those described above, respectively. Figure 7 , 8 , 9, 10 and / or 13. As shown, the method 1300 includes a plurality of enumerated steps, but aspects of the method 1300 may include additional steps before, after and between the enumerated steps. In some aspects, one or more of the enumerated steps may be omitted or performed in a different order.

[0180] At block 1510, a UE (e.g., UE 115, 500, and / or 704) determines that a cell of a wireless communication network is operating in a sleep mode. The wireless communication network may be similar to network 100. In some aspects, the UE may determine to operate in a sleep mode utilizing one or more components such as processor 502, memory 504, BFD module 508, transceiver 510, modem 512, and one or more antennas 516.

[0181] At block 1520, the UE operates in a dormant mode for a cell of a wireless communication network. Operating in the dormant mode includes performing beam failure detection (BFD) in a dormant bandwidth part (BWP) based on a configuration, for example, as described above with reference to Fig. 9 In some aspects, the UE may operate in a sleep mode with one or more components (such as the processor 502, memory 504, BFD module 508, transceiver 510, modem 512, and one or more antennas 516).

[0182] In some aspects, the UE also receives a configuration including a control resource set (CORESET) configuration for a dormant BWP. Performing BFD at block 1520 includes monitoring one or more BFD reference signals (RS) in a dormant BWP based on the CORESET configuration for the dormant BWP. In some aspects, the CORESET configuration indicates a CORESET in the dormant BWP, and monitoring the one or more BFD RSs includes monitoring one or more BFD RSs associated with a transmission configuration indication (TCI) state of the CORESET. In some aspects, the UE further determines that the first QCL type and the second QCL type are associated with the TCI state of the CORESET, and monitoring the one or more BFD RSs associated with the TCI state of the CORESET includes monitoring one or more BFD RSs associated with the TCI state of the CORESET based on the second QCL type. In some aspects, the second QCL type includes QCL type D. In some aspects, operating in dormant mode at block 1520 includes refraining from performing physical downlink control channel (PDCCH) monitoring in a dormant BWP based on the CORESET configuration. In some aspects, the CORESET configuration indicates a CORESET in a dormant BWP but does not include any PDCCH search space configuration associated with the CORESET in the dormant BWP.

[0183] Fig.161600 is a flowchart of a wireless communication method 1600 according to some aspects of the present disclosure. Aspects of the method 1600 may be performed by a computing device (e.g., a processor, a processing circuit, and / or other suitable components) of a wireless communication device or other suitable means for performing these steps. For example, a wireless communication device such as the BS 105, 600, and / or 702 may utilize one or more components (such as a processor 602, a memory 604, a beam configuration and transmission module 608, a transceiver 610, a modem 612, and one or more antennas 616) to perform the steps of the method 1600. The method 1600 may be implemented in the same manner as described above with reference to the respective embodiments. Figure 3 , 4 , 11, 12A, 12B and / or 12C discussed in schemes 300, 400, 1100, 1202, 1204 and / or 1206, and / or the above references, respectively Figure 7 , 8 , 9, 10 and / or 14 discussed in the methods 700, 800, 900, 1000 and / or 1400. As shown, the method 1600 includes a plurality of enumerated steps, but aspects of the method 1600 may include additional steps before, after and between the enumerated steps. In some aspects, one or more of the enumerated steps may be omitted or performed in a different order.

[0184] At block 1610, a BS (e.g., BS 105, 600, and / or 702) determines that a UE (e.g., UE 115, 500, and / or 704) is operating in a sleep mode for a cell of a wireless communication network. In some aspects, the BS may utilize one or more components (such as processor 602, memory 604, beam configuration and transmission module 608, transceiver 610, modem 612, and one or more antennas 616) to determine that the UE is operating in a sleep mode.

[0185] At block 1620, the BS sends a configuration to the UE for performing beam failure detection (BFD) in a sleep bandwidth part (BWP) associated with the sleep mode. In some aspects, sending the configuration includes sending a configuration including a control resource set (CORESET) configuration for the sleep BWP. In some aspects, the BS may utilize one or more components (such as the processor 602, the memory 604, the beam configuration and transmission module 608, the transceiver 610, the modem 612, and the one or more antennas 616) to send the configuration for performing BFD in the sleep mode.

[0186] In some aspects, the BS further transmits one or more BFD RSs in the dormant BWP based on a CORESET configuration for the dormant BWP. In some aspects, the CORESET configuration indicates a CORESET in the dormant BWP, and transmitting the one or more BFD RSs includes transmitting the one or more BFD RSs based on a transmission configuration indication (TCI) state of the CORESET. In some aspects, transmitting the one or more BFD RSs associated with the TCI state of the CORESET includes transmitting at least one of the following: a first BFD RS of one or more BFD RSs associated with the TCI state of the CORESET based on a first QCL type, or a second BFD RS of one or more BFD RSs associated with the TCI state of the CORESET based on a second QCL type different from the first QCL type. In some aspects, the second QCL type includes QCL type D. In some aspects, the BS further determines one or more control resource sets (CORESETs) for the UE in the dormant BWP, the CORESET configuration indicating the one or more CORESETs. The BS may also suppress allocating any physical downlink control channel (PDCCH) search space for the UE in the dormant BWP.

[0187] Information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, code elements, and chips that may be referenced throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0188] The various illustrative blocks and modules described in conjunction with the disclosure herein may be implemented or executed using a general purpose processor, a DSP, an ASIC, an 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. A general purpose processor may be a microprocessor, but alternatively, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors combined with a DSP core, or any other such configuration).

[0189] The functions described herein can be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions can be stored on a computer-readable medium or sent via a computer-readable medium as one or more instructions or codes. Other examples and implementations are within the scope of the present disclosure and the appended claims. For example, due to the nature of software, the functions described above can be implemented using software, hardware, firmware, hard wiring, or any combination thereof executed by a processor. The features that implement the functions can also be physically located in various locations, including being distributed so that the parts of the functions are implemented at different physical locations. In addition, as used herein, including in the claims, as in a list of items (e.g., a list of items beginning with phrases such as "at least one" or "one or more of"), "or" indicates an inclusive list, so that, for example, a list of "[at least one of A, B, or C]" represents A or B or C or AB or AC or BC or ABC (i.e. A and B and C).

[0190] As some skilled in the art will understand by now and depending on the specific application at hand, many modifications, substitutions and changes can be made to the materials, devices, configurations and methods of use of the apparatus of the present disclosure without departing from the spirit and scope of the present disclosure. In view of this, the scope of the present disclosure should not be limited to the scope of the specific embodiments shown and described herein, as they are merely by way of some examples thereof, but should be fully commensurate with the scope of the following appended claims and their functional equivalents.

Claims

1. A method of wireless communication performed by a first user equipment (UE), the method comprising: determining that a cell for the wireless communication network is operating in a dormant mode; and operating in the sleep mode for a cell of the wireless communication network, wherein operating in the sleep mode comprises performing beam failure detection (BFD) in a sleep bandwidth part (BWP) based on a configuration, Also includes: receiving said configuration including a control resource set (CORESET) configuration for said dormant BWP, The performing of the BFD includes: monitoring one or more BFD reference signals (RS) in the dormant BWP based on a CORESET configuration for the dormant BWP, wherein the CORESET configuration indicates a CORESET in the dormant BWP, and wherein monitoring the one or more BFD RSs comprises: The one or more BFD RSs are monitored in association with a transmission configuration indication (TCI) state of the CORESET.

2. The method according to claim 1, further comprising: determining that a first QCL type and a second QCL type are associated with a TCI state of the CORESET; and Wherein monitoring the one or more BFD RSs associated with the TCI state of the CORESET comprises: The one or more BFDRS associated with a TCI state of the CORESET based on the second QCL type are monitored.

3. The method according to claim 2, wherein: The second QCL type includes QCL type D.

4. The method according to claim 1, wherein: Operations in the sleep mode include: Performing physical downlink control channel (PDCCH) monitoring in the dormant BWP is suppressed based on the CORESET configuration.

5. The method according to claim 1, wherein: The CORESET configuration indicates a CORESET in the dormant BWP, and wherein the configuration does not include any PDCCH search space configuration associated with the CORESET in the dormant BWP.

6. A method of wireless communication performed by a base station (BS), the method comprising: determining that a user equipment (UE) is operating in a dormant mode for a cell of a wireless communication network; and sending a configuration to the UE for performing beam failure detection (BFD) in a sleep bandwidth part (BWP) associated with the sleep mode, Wherein, sending the configuration includes: sending said configuration including a control resource set (CORESET) configuration for said dormant BWP, Also includes: sending one or more BFD RSs in the dormant BWP based on a CORESET configuration for the dormant BWP, Wherein, the CORESET configuration indicates a CORESET in the dormant BWP, and wherein sending the one or more BFD RSs comprises: The one or more BFD RSs are transmitted based on a transmission configuration indication (TCI) state of the CORESET.

7. The method according to claim 6, wherein: Sending the one or more BFD RSs associated with the TCI state of the CORESET includes sending at least one of the following: a first BFD RS of the one or more BFD RSs associated with the TCI state of the CORESET based on a first QCL type; or A second BFD RS of the one or more BFD RSs associated with the TCI state of the CORESET based on a second QCL type different from the first QCL type.

8. The method according to claim 7, wherein: The second QCL type includes QCL type D.

9. The method according to claim 6, further comprising: determining one or more control resource sets (CORESETs) for the UE in the dormant BWP, the CORESET configuration indicating the one or more CORESETs; and Allocating any physical downlink control channel (PDCCH) search space for the UE in the dormant BWP is refrained.

10. A user equipment (UE) comprising: Memory; as well as a processor, coupled to the memory and configured to, when executing instructions stored in the memory, cause the UE to: determining that a cell for the wireless communication network is operating in a dormant mode; and operating in the sleep mode for a cell of the wireless communication network, wherein operating in the sleep mode comprises performing beam failure detection (BFD) in a sleep bandwidth part (BWP) based on a configuration, Wherein, the processor is further configured to: receiving said configuration including a control resource set (CORESET) configuration for said dormant BWP, Wherein, the processor configured to execute the BFD is configured to: monitoring one or more BFD reference signals (RS) in the dormant BWP based on a CORESET configuration for the dormant BWP, wherein the CORESET configuration indicates a CORESET in the dormant BWP, and wherein the processor configured to monitor the one or more BFD RSs is configured to: The one or more BFD RSs are monitored in association with a transmission configuration indication (TCI) state of the CORESET.

11. The UE according to claim 10, wherein: The processor is further configured to: determining that a first QCL type and a second QCL type are associated with a TCI state of the CORESET; and wherein the processor configured to monitor the one or more BFD RSs associated with the TCI state of the CORESET is configured to: The one or more BFDRS associated with a TCI state of the CORESET based on the second QCL type are monitored.

12. The UE according to claim 11, wherein: The second QCL type includes QCL type D.

13. The UE according to claim 10, wherein: The processor configured to operate in the sleep mode is configured to: Performing physical downlink control channel (PDCCH) monitoring in the dormant BWP is suppressed based on the CORESET configuration.

14. The UE according to claim 10, wherein: The CORESET configuration indicates a CORESET in the dormant BWP, and wherein the configuration does not include any PDCCH search space configuration associated with the CORESET in the dormant BWP.

15. A base station (BS), comprising: Memory; as well as A processor is coupled to the memory and configured to, when executing instructions stored on the memory, cause the BS to: determining that a user equipment (UE) is operating in a dormant mode for a cell of a wireless communication network; and sending a configuration to the UE for performing beam failure detection (BFD) in a sleep bandwidth part (BWP) associated with the sleep mode, Wherein, the processor configured to send the configuration is further configured to: sending said configuration including a control resource set (CORESET) configuration for said dormant BWP, Wherein, the processor is further configured to: sending one or more BFD RSs in the dormant BWP based on a CORESET configuration for the dormant BWP, wherein the CORESET configuration indicates a CORESET in the dormant BWP, and wherein the processor configured to send the one or more BFD RSs is configured to: The one or more BFD RSs are transmitted based on a transmission configuration indication (TCI) state of the CORESET.

16. The BS according to claim 15, wherein: The processor configured to send the one or more BFD RSs associated with the TCI state of the CORESET is configured to send at least one of: a first BFD RS of the one or more BFD RSs associated with the TCI state of the CORESET based on a first QCL type; or A second BFD RS of the one or more BFD RSs associated with the TCI state of the CORESET based on a second QCL type different from the first QCL type.

17. The BS according to claim 16, wherein: The second QCL type includes QCL type D.

18. The BS according to claim 15, wherein: The processor is further configured to: determining one or more control resource sets (CORESETs) for the UE in the dormant BWP, the CORESET configuration indicating the one or more CORESETs; and Allocating any physical downlink control channel (PDCCH) search space for the UE in the dormant BWP is refrained.

19. A user equipment (UE), comprising: means for determining that a cell of a wireless communication network is operating in a dormant mode; and means for operating in the sleep mode for a cell of the wireless communication network, wherein operating in the sleep mode comprises performing beam failure detection (BFD) in a sleep bandwidth part (BWP) based on a configuration, Also includes: means for receiving said configuration comprising a control resource set (CORESET) configuration for said dormant BWP, The performing of the BFD includes: monitoring one or more BFD reference signals (RS) in the dormant BWP based on a CORESET configuration for the dormant BWP, wherein the CORESET configuration indicates a CORESET in the dormant BWP, and wherein monitoring the one or more BFD RSs comprises: The one or more BFD RSs are monitored in association with a transmission configuration indication (TCI) state of the CORESET.

20. A non-transitory computer readable medium having instructions stored thereon, the instructions executable by a processor to implement the method of any one of claims 1 to 5.

21. A base station (BS), comprising: means for determining that a user equipment (UE) is operating in a dormant mode with respect to a cell of a wireless communication network; and means for sending to the UE a configuration for performing beam failure detection (BFD) in a sleep bandwidth part (BWP) associated with the sleep mode, Wherein, sending the configuration includes: sending said configuration including a control resource set (CORESET) configuration for said dormant BWP, Also includes: means for transmitting one or more BFD RSs in the dormant BWP based on a CORESET configuration for the dormant BWP, Wherein, the CORESET configuration indicates a CORESET in the dormant BWP, and wherein sending the one or more BFD RSs comprises: The one or more BFD RSs are transmitted based on a transmission configuration indication (TCI) state of the CORESET.

22. A non-transitory computer readable medium having instructions stored thereon, the instructions executable by a processor to implement the method of any one of claims 6 to 9.

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