Beam Failure Detection and Indication in DRX Mode

Abstract

The apparatus is configured to provide an enhanced power management solution by configuring a UE to perform a beam failure detection (BFD) procedure in view of the UE's DRX configuration and the periodicity of a reference signal for evaluating radio link quality. The apparatus receives a DRX configuration having a DRX cycle including a DRX on-duration and a DRX off-duration. The apparatus then determines a beam failure indication period based on the periodicity of a reference signal (RS) configured for beam failure detection and the DRX cycle. The apparatus then performs radio link quality measurements on at least one of the RSs based on the beam failure indication period determined by the UE.

Description

[0001] Cross - Reference to Related Applications

[0002] This application claims the benefit of U.S. Provisional Application No. 62 / 716,328, titled "BEAM FAILURE DETECTION AND INDICATION IN DRX MODE", filed on Aug. 8, 2018, and U.S. Patent Application No. 16 / 453,874, titled "BEAM FAILURE DETECTION AND INDICATION IN DRX MODE", filed on Jun. 26, 2019, which are hereby incorporated by reference in their entireties. Field of the Disclosure

[0003] The present disclosure generally relates to communication systems, and more particularly to beam failure detection. Background Art

[0004] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasting. A typical wireless communication system may employ a multiple access technology capable of supporting communication with multiple users by sharing available system resources. Examples of such multiple access technologies include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, Single - Carrier Frequency Division Multiple Access (SC - FDMA) systems, and Time Division Synchronous Code Division Multiple Access (TD - SCDMA) systems.

[0005] These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate at the city, national, regional, and even global levels. An example telecommunication standard is 5G New Radio (NR). 5G NR is part of the continuous mobile broadband evolution promulgated by the Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., related to the Internet of Things (IoT)), and other requirements. 5G NR includes services associated with Enhanced Mobile Broadband (eMBB), Massive Machine - Type Communication (mMTC), and Ultra - Reliable Low - Latency Communication (URLLC). Some aspects of 5G NR may be based on the 4G Long - Term Evolution (LTE) standard. There is a need for further improvement in 5G NR technology. These improvements may also be applicable to other multiple access technologies and telecommunication standards that employ these technologies. Summary of the Invention

[0006] A brief overview of one or more aspects is given below to provide a basic understanding of such aspects. This overview is not an exhaustive survey of all contemplated aspects and is neither intended to identify key or critical elements of all aspects nor to delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that follows.

[0007] In one aspect of the present disclosure, a method, a computer-readable medium, and an apparatus for wireless communication at a UE are provided. The apparatus receives a DRX configuration having a DRX cycle that includes a DRX-on duration and a DRX-off duration. Then, the apparatus determines a beam failure indication period based on the periodicity of a reference signal (RS) configured for beam failure detection and the DRX cycle. Then, the apparatus performs radio link quality measurements on at least one of the RSs based on the beam failure indication period determined by the UE.

[0008] In another aspect of the present disclosure, a method, a computer-readable medium, and an apparatus for wireless communication at a base station are provided. The apparatus determines the length of the DRX cycle of a UE based on the delay sensitivity of the UE. The apparatus configures the UE with a DRX configuration having a DRX cycle that includes a DRX-on duration and a DRX-off duration. The apparatus transmits a periodic reference signal (RS) configured for beam failure detection.

[0009] To achieve the foregoing and related purposes, one or more of these aspects include the features that are fully described hereinafter and particularly pointed out in the claims. The following description and the drawings set forth in detail certain illustrative features of one or more of these aspects. However, these features are merely indicative of the various ways in which the principles of the aspects may be employed, and this description is intended to cover all such aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a diagram illustrating an example of a wireless communication system and an access network.

[0011] Figure 2A 、 2B 、2C, and 2D are diagrams respectively illustrating examples of a first 5G / NR frame, DL channels within a 5G / NR subframe, a second 5G / NR frame, and UL channels within a 5G / NR subframe.

[0012] Figure 3 is a diagram illustrating an example of a base station and a user equipment (UE) in an access network.

[0013] Figure 4 is a diagram illustrating a base station and a UE in communication.

[0014] Figure 5 Illustrates an example of DRX configuration according to certain aspects of the present disclosure.

[0015] Figure 6 Illustrates another example of DRX configuration according to certain aspects of the present disclosure.

[0016] Figure 7 Illustrates an example communication flow between a base station and a UE.

[0017] Figure 8 Is a flowchart of a wireless communication method.

[0018] Figure 9 Is a conceptual data flow diagram illustrating the data flow between different components / elements in an example device.

[0019] Figure 10 Is a diagram illustrating an example of a hardware implementation of a device employing a processing system.

[0020] Figure 11 Is a flowchart of a wireless communication method.

[0021] Figure 12 Is a conceptual data flow diagram illustrating the data flow between different components / elements in an example device.

[0022] Figure 13 Is a diagram illustrating an example of a hardware implementation of a device employing a processing system. Detailed Description

[0023] The following detailed description presented in conjunction with the accompanying drawings is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. The detailed description includes specific details for a thorough understanding of the various concepts. However, it will be apparent to those skilled in the art that these concepts may be practiced without these specific details. In some instances, well-known structures and components are shown in block diagram form to avoid obscuring such concepts.

[0024] Certain aspects of a telecommunications system will now be presented with reference to various devices and methods. These devices and methods will be described in the following detailed description and illustrated in the drawings by various blocks, components, circuits, processes, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using electronic hardware, computer software, or any combination thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.

[0025] By way of example, an element, or any portion of an element, or any combination of elements can be implemented as a "processing system" that includes one or more processors. Examples of processors include: microprocessors, microcontrollers, graphics processing units (GPUs), central processing units (CPUs), application processors, digital signal processors (DSPs), reduced instruction set computing (RISC) processors, systems on a chip (SoCs), baseband processors, field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functions described throughout this disclosure. One or more processors in the processing system can execute software. Software should be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects, executables, execution threads, procedures, functions, etc., regardless of whether it is referred to in software, firmware, middleware, microcode, hardware description language, or other terms.

[0026] Accordingly, in one or more example embodiments, the described functions can be implemented in hardware, software, or any combination thereof. If implemented in software, the functions can be stored or encoded as one or more instructions or code on a computer-readable medium. Computer-readable media includes computer storage media. Storage media can be any available medium that can be accessed by a computer. By way of example and not limitation, such computer-readable media can include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), optical disk storage, magnetic disk storage, other magnetic storage devices, combinations of the aforementioned types of computer-readable media, or any other medium that can be used to store computer-executable code in the form of instructions or data structures that can be accessed by a computer.

[0027] Figure 1 is a diagram illustrating an example of a wireless communication system and an access network 100. The wireless communication system (also referred to as a wireless wide area network (WWAN)) includes base stations 102, UEs 104, an evolved packet core (EPC) 160, and a 5G core (5GC) 190. The base stations 102 can include macro cells (high-power cellular base stations) and / or small cells (low-power cellular base stations). Macro cells include base stations. Small cells include femtocells, picocells, and microcells.

[0028] The base stations 102 configured for 4G LTE (collectively referred to as the evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN)) can interface with the EPC 160 via a backhaul link 132 (e.g., the S1 interface). The base stations 102 configured for 5G NR (collectively referred to as the Next Generation RAN (NG-RAN)) can interface with the 5GC 190 via a backhaul link 184. In addition to other functions, the base stations 102 can also perform one or more of the following functions: transfer of user data, radio channel ciphering and deciphering, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection establishment and release, load balancing, distribution of non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS), subscriber and device tracking, radio access network information management (RIM), paging, positioning, and delivery of alert messages. The base stations 102 can communicate with each other directly or indirectly (e.g., via the EPC 160 or 5GC 190) on a backhaul link 134 (e.g., the X2 interface). The backhaul link 134 can be wired or wireless.

[0029] Base station 102 can communicate wirelessly with UE 104. Each base station 102 can provide communication coverage for its respective geographical coverage area 110. There may be overlapping geographical coverage areas 110. For example, small cell 102' may have a coverage area 110' that overlaps with the coverage areas 110 of one or more macro base stations 102. A network including both small cells and macro cells can be referred to as a heterogeneous network. The heterogeneous network may also include a Home evolved Node B (HeNB), which can serve a restricted group known as a Closed Subscriber Group (CSG). The communication link 120 between the base station 102 and the UE 104 can include an uplink (UL) (also known as the reverse link) transmission from the UE 104 to the base station 102 and / or a downlink (DL) (also known as the forward link) transmission from the base station 102 to the UE 104. The communication link 120 can use multiple-input multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and / or transmit diversity. These communication links can be through one or more carriers. For each carrier allocated in carrier aggregation with a total of up to Yx MHz (x component carriers) for transmission in each direction, the base station 102 / UE 104 can use a spectrum with a bandwidth of up to Y MHz (e.g., 5, 10, 15, 20, 100, 400 MHz, etc.). These carriers may or may not be adjacent to each other. The allocation of carriers can be asymmetric with respect to the DL and UL (e.g., more or fewer carriers may be allocated to the DL compared to the UL). The component carriers can include a primary component carrier and one or more secondary component carriers. The primary component carrier can be referred to as the Primary Cell (PCell), and the secondary component carriers can be referred to as Secondary Cells (SCells).

[0030] Some UEs 104 can communicate with each other using device-to-device (D2D) communication links 158. The D2D communication links 158 can use DL / UL WWAN spectrum. The D2D communication links 158 can use one or more sidelink channels, such as the Physical Sidelink Broadcast Channel (PSBCH), Physical Sidelink Discovery Channel (PSDCH), Physical Sidelink Shared Channel (PSSCH), and Physical Sidelink Control Channel (PSCCH). D2D communication can be through various wireless D2D communication systems, such as, for example, FlashLinQ, WiMedia, Bluetooth, ZigBee, Wi-Fi based on the IEEE 802.11 standard, LTE, or NR.

[0031] The wireless communication system may further include a Wi-Fi access point (AP) 150 that communicates with a Wi-Fi station (STA) 152 via a communication link 154 in the 5 GHz unlicensed spectrum. When communicating in the unlicensed spectrum, the STA 152 / AP 150 may perform a clear channel assessment (CCA) before communication to determine whether the channel is available.

[0032] The small cell 102' may operate in licensed and / or unlicensed spectrum. When operating in the unlicensed spectrum, the small cell 102' may adopt NR and use the same 5 GHz unlicensed spectrum as that used by the Wi-Fi AP 150. The small cell 102' adopting NR in the unlicensed spectrum may boost the coverage of the access network and / or increase the capacity of the access network.

[0033] Regardless of whether it is the small cell 102' or a large cell (e.g., a macro base station), the base station 102 may include an eNB, a gNodeB node (gNB), or other types of base stations. Some base stations (such as the gNB 180) may operate in traditional sub-6 GHz spectrum, millimeter wave (mmW) frequencies, and / or near mmW frequencies to communicate with the UE 104. When the gNB 180 operates in mmW or near mmW frequencies, the gNB 180 may be referred to as a mmW base station. The extremely high frequency (EHF) is a part of the RF in the electromagnetic spectrum. The EHF has a range of 30 GHz to 300 GHz and a wavelength between 1 millimeter and 10 millimeters. The radio waves in this frequency band may be referred to as millimeter waves. The near mmW may extend down to a frequency of 3 GHz and a wavelength of 100 millimeters. The super high frequency (SHF) band extends between 3 GHz and 30 GHz, which is also referred to as centimeter waves. Communication using the mmW / near mmW radio frequency band has extremely high path loss and short range. The mmW base station 180 may utilize beamforming 104 with the UE 182 to compensate for the extremely high path loss and short range.

[0034] The EPC 160 may include a Mobility Management Entity (MME) 162, other MMEs 164, a Serving Gateway 166, a Multimedia Broadcast Multicast Service (MBMS) Gateway 168, a Broadcast Multicast Service Center (BM-SC) 170, and a Packet Data Network (PDN) Gateway 172. The MME 162 may communicate with a Home Subscriber Server (HSS) 174. The MME 162 is a control node that processes signaling between the UE 104 and the EPC 160. Generally, the MME 162 provides bearer and connection management. All user Internet Protocol (IP) packets are routed through the Serving Gateway 166, which is itself connected to the PDN Gateway 172. The PDN Gateway 172 provides UE IP address allocation and other functions. The PDN Gateway 172 and the BM-SC 170 are connected to an IP service 176. The IP service 176 may include the Internet, an intranet, an IP Multimedia Subsystem (IMS), a PS streaming service, and / or other IP services. The BM-SC 170 may provide functions for MBMS user service provisioning and delivery. The BM-SC 170 may serve as an entry point for content provider MBMS transmissions, may be used to authorize and initiate MBMS bearer services within a Public Land Mobile Network (PLMN), and may be used to schedule MBMS transmissions. The MBMS Gateway 168 may be used to distribute MBMS traffic to base stations 102 belonging to a Multicast Broadcast Single Frequency Network (MBSFN) area for a particular broadcast service, and may be responsible for session management (start / stop) and for collecting eMBMS-related charging information.

[0035] The 5GC 190 may include an Access and Mobility Management Function (AMF) 192, other AMFs 193, a Session Management Function (SMF) 194, and a User Plane Function (UPF) 195. The AMF 192 may communicate with a Unified Data Management (UDM) 196. The AMF 192 is a control node that processes signaling between the UE 104 and the 5GC 190. Generally, the AMF 192 provides QoS flow and session management. All user Internet Protocol (IP) packets are routed through the UPF 195. The UPF 195 provides UE IP address allocation and other functions. The UPF 195 is connected to an IP service 197. The IP service 197 may include the Internet, an intranet, an IP Multimedia Subsystem (IMS), a PS streaming service, and / or other IP services.

[0036] A base station may also be referred to as a gNB, Node B, evolved Node B (eNB), access point, base transceiver station, radio base station, radio transceiver, transceiver function, basic service set (BSS), extended service set (ESS), transmission reception point (TRP), or some other suitable term. Base station 102 provides an access point for UE 104 to EPC 160 or 5GC 190. Examples of UE 104 include cellular phones, smart phones, session initiation protocol (SIP) phones, laptop devices, personal digital assistants (PDAs), satellite radios, global positioning systems, multimedia devices, video devices, digital audio players (e.g., MP3 players), cameras, game consoles, tablet devices, smart devices, wearable devices, vehicles, electricity meters, air pumps, large or small kitchen appliances, healthcare devices, implants, sensors / actuators, displays, or any other similar functional devices. Some UEs 104 may be referred to as IoT devices (e.g., parking meters, air pumps, ovens, vehicles, heart monitors, etc.). UE 104 may also be referred to as a station, mobile station, subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.

[0037] Referring again to Figure 1, in some aspects, the base station 180 may include a DRX cycle component 198 configured to determine the length of the DRX cycle of a UE (e.g., UE 104). In some examples, the length of the DRX cycle may be based on the latency sensitivity of the UE. The base station 108 may configure the UE with a DRX configuration having a DRX cycle. The UE 104 may include a beam failure indication cycle component 199 configured to determine a beam failure indication cycle. For example, the base station 180 may configure the UE with a DRX cycle including a DRX on duration and a DRX off duration. The base station 180 may send a DRX configuration with a DRX cycle to the UE, where the DRX cycle includes, for example, a DRX on duration and a DRX off duration. The base station 108 may be configured to send a periodic reference signal (RS) configured for beam failure detection to the UE. The UE receives the DRX configuration from the base station and is configured to determine the beam failure indication cycle based on the periodicity of the RS configured for beam failure detection and the DRX cycle. For example, the UE may evaluate the radio link quality of the reference signal configured for beam failure detection once per failure indication cycle, and the failure indication cycle may be determined as the maximum of the shortest periodicity of the reference signal and the DRX cycle. The UE may be configured to perform radio link quality measurements on at least one of the RSs. The radio link quality measurements may be based on the beam failure indication cycle determined by the UE. The UE may be configured to wake up before the DRX on duration of the DRX cycle to perform radio link quality measurements. In some examples, the UE may detect a beam failure and initiate a beam failure recovery procedure before the on duration of the DRX cycle. Although the following description may focus on 5G NR, the concepts described herein may be applicable to other similar fields such as LTE, LTE-A, CDMA, GSM, and other wireless technologies.

[0038] Figure 2A FIG. 200 is an example illustrating a first subframe within the 5G / NR frame structure. Figure 2B FIG. 230 is an example illustrating DL channels within a 5G / NR subframe. Figure 2C FIG. 250 is an example illustrating a second subframe within the 5G / NR frame structure. Figure 2D FIG. 280 is an example illustrating UL channels within a 5G / NR subframe. The 5G / NR frame structure may be FDD, where for a particular set of subcarriers (carrier system bandwidth), the subframes within that set of subcarriers are dedicated to DL or UL; or it may be TDD, where for a particular set of subcarriers (carrier system bandwidth), the subframes within that set of subcarriers are dedicated to both DL and UL. In Figure 2A , 2CIn the provided example, the 5G / NR frame structure is assumed to be TDD, where subframe 4 is configured with slot format 28 (mostly DL) and subframe 3 is configured with slot format 34 (mostly UL), where D is DL, U is UL, and X is for flexible use between DL / UL. Although subframes 3 and 4 are shown as having slot formats 34 and 28 respectively, any particular subframe can be configured with any of the various available slot formats 0 - 61. Slot formats 0 and 1 are all DL and all UL respectively. The other slot formats 2 - 61 include a mixture of DL, UL, and flexible symbols. The UE is configured with a slot format by the received Slot Format Indicator (SFI) (configured dynamically via Downlink Control Information (DCI), or semi-statically / statically via Radio Resource Control (RRC) signaling). Note that the following description also applies to the 5G / NR frame structure that is TDD.

[0039] Other wireless communication technologies may have different frame structures and / or different channels. One frame (10 ms) can be divided into 10 equal-sized subframes (1 ms). Each subframe can include one or more slots. A subframe can also include mini-slots, which can include 7, 4, or 2 symbols. Each slot can include 7 or 14 symbols, depending on the slot configuration. For slot configuration 0, each slot can include 14 symbols, while for slot configuration 1, each slot can include 7 symbols. The symbols on the DL can be Cyclic Prefix (CP) OFDM (CP-OFDM) symbols. The symbols on the UL can be CP-OFDM symbols (for high throughput scenarios) or Discrete Fourier Transform (DFT) spread OFDM (DFT-s-OFDM) symbols (also known as Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols) (for power-constrained scenarios; limited to single-stream transmission). The number of slots within a subframe is based on the slot configuration and numerology. For slot configuration 0, different numerologies μ0 to 5 respectively allow 1, 2, 4, 8, 16, and 32 slots per subframe. For slot configuration 1, different numerologies 0 to 2 respectively allow 2, 4, and 8 slots per subframe. Accordingly, for slot configuration 0 and numerology μ, there are 14 symbols per slot and 2μ slots per subframe. The subcarrier spacing and symbol length / duration are functions of the numerology. The subcarrier spacing can be equal to 2 μ *15 kHz, where μ is numerology 0 to 5. Thus, numerology μ = 0 has a subcarrier spacing of 15 kHz, while numerology μ = 5 has a subcarrier spacing of 480 kHz. The symbol length / duration is inversely proportional to the subcarrier spacing. Figures 2A - 2D An example of slot configuration 0 with 14 symbols per slot and numerology μ = 0 with 1 slot per subframe is provided. The subcarrier spacing is 15 kHz and the symbol duration is approximately 66.7 μs.

[0040] The resource grid can be used to represent the frame structure. Each time slot includes a resource block (RB) (also referred to as a physical RB (PRB)) that extends over 12 consecutive subcarriers. The resource grid is divided into multiple resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.

[0041] As Figure 2A shown, some REs carry reference (pilot) signals (RSs) for the UE. The RSs can include demodulation RSs (DM-RSs) for channel estimation at the UE (denoted as Rx for a particular configuration, where 100x is the port number, but other DM-RS configurations are possible) and channel state information reference signals (CSI-RSs). The RSs can also include beam measurement RSs (BRSs), beam refinement RSs (BRRSs), and phase tracking RSs (PT-RSs).

[0042] Figure 2B Examples of various DL channels within a subframe of a frame are shown. The physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs), each CCE including 9 RE groups (REGs), each REG including 4 consecutive REs in an OFDM symbol. The primary synchronization signal (PSS) can be in symbol 2 of a particular subframe of the frame. The PSS is used by the UE 104 to determine subframe / symbol timing and the physical layer identity. The secondary synchronization signal (SSS) can be in symbol 4 of a particular subframe of the frame. The SSS is used by the UE to determine the physical layer cell identity group number and the radio frame timing. Based on the physical layer identity and the physical layer cell identity group number, the UE can determine the physical cell identifier (PCI). Based on the PCI, the UE can determine the location of the aforementioned DM-RS. The physical broadcast channel (PBCH) carrying the master information block (MIB) can be logically combined with the PSS and SSS to form a synchronization signal (SS) / PBCH block. The MIB provides the number of RBs in the system bandwidth and the system frame number (SFN). The physical downlink shared channel (PDSCH) carries user data, broadcast system information not sent via the PBCH (such as system information blocks (SIBs)), and paging messages.

[0043] As Figure 2CAs shown, some REs carry DM-RS for channel estimation at the base station (indicated as R for one particular configuration, but other DM-RS configurations are possible). The UE may transmit DM-RS for the physical uplink control channel (PUCCH) and DM-RS for the physical uplink shared channel (PUSCH). The PUSCH DM-RS may be transmitted in the first or first two symbols of the PUSCH. The PUCCH DM-RS may be transmitted in different configurations depending on whether a short PUCCH or a long PUCCH is being transmitted and depending on the particular PUCCH format used. Although not shown, the UE may transmit a sounding reference signal (SRS). The SRS may be used by the base station for channel quality estimation to enable frequency-dependent scheduling on the UL.

[0044] Figure 2D Examples of various UL channels within a subframe of a frame are shown. The PUCCH may be located at the positions indicated in one configuration. The PUCCH carries uplink control information (UCI), such as a scheduling request, a channel quality indicator (CQI), a precoding matrix indicator (PMI), a rank indicator (RI), and HARQ ACK / NACK feedback. The PUSCH carries data and may additionally be used to carry a buffer status report (BSR), a power headroom report (PHR), and / or UCI.

[0045] Figure 3It is a block diagram of the communication between the base station 310 and the UE 350 in the access network. In the DL, the IP packets from the EPC 160 can be provided to the controller / processor 375. The controller / processor 375 implements layer 3 and layer 2 functionality. Layer 3 includes the radio resource control (RRC) layer, and layer 2 includes the packet data convergence protocol (PDCP) layer, the radio link control (RLC) layer, and the media access control (MAC) layer. The controller / processor 375 provides RRC layer functionality associated with the broadcast of system information (e.g., MIB, SIB), RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release), inter-frame radio access technology (RAT) mobility, and measurement configuration for UE measurement reports; PDCP layer functionality associated with header compression / decompression, security (ciphering, deciphering, integrity protection, integrity verification), and handover support functions; RLC layer functionality associated with the transfer of upper layer packet data units (PDUs), error correction via ARQ, concatenation, segmentation, and reassembly of RLC service data units (SDUs), re-segmentation of RLC data PDUs, and re-ordering of RLC data PDUs; and MAC layer functionality associated with the mapping between logical channels and transport channels, multiplexing of MAC SDUs onto transport blocks (TBs), demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction via HARQ, priority handling, and logical channel prioritization.

[0046] The transmit (TX) processor 316 and the receive (RX) processor 370 implement the layer 1 functionality associated with various signal processing functions. Layer 1, which includes the physical (PHY) layer, may include error detection on the transport channels, forward error correction (FEC) encoding / decoding of the transport channels, interleaving, rate matching, mapping to physical channels, modulation / demodulation of the physical channels, and MIMO antenna processing. The TX processor 316 handles the mapping to the signal constellation based on various modulation schemes (e.g., binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), M-phase shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)). The encoded and modulated symbols may then be split into parallel streams. Each stream may then be mapped to OFDM subcarriers, multiplexed with reference signals (e.g., pilots) in the time and / or frequency domain, and then combined together using an inverse fast Fourier transform (IFFT) to generate a physical channel carrying a stream of time-domain OFDM symbols. The OFDM stream is space precoded to generate multiple spatial streams. Channel estimates from the channel estimator 374 may be used to determine the encoding and modulation schemes and for spatial processing. The channel estimates may be derived from reference signals transmitted by the UE 350 and / or channel status feedback. Each spatial stream is then provided to a different antenna 320 via a separate transmitter 318TX. Each transmitter 318TX modulates an RF carrier with the respective spatial stream for transmission.

[0047] At the UE 350, each receiver 354RX receives signals via its respective corresponding antenna 352. Each receiver 354RX recovers the information modulated onto the RF carrier and provides the information to the receive (RX) processor 356. The TX processor 368 and the RX processor 356 implement the layer 1 functionality associated with various signal processing functions. The RX processor 356 may perform spatial processing on the information to recover any spatial streams destined for the UE 350. If there are multiple spatial streams destined for the UE 350, they may be combined by the RX processor 356 into a single OFDM symbol stream. The RX processor 356 then uses a fast Fourier transform (FFT) to transform the OFDM symbol stream from the time domain to the frequency domain. The frequency-domain signal includes a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbols on each subcarrier, as well as the reference signals, are recovered and demodulated by determining the signal constellation points most likely transmitted by the base station 310. These soft decisions may be based on the channel estimates calculated by the channel estimator 358. These soft decisions are then decoded and deinterleaved to recover the original data and control signals transmitted by the base station 310 on the physical channel. These data and control signals are then provided to the controller / processor 359 that implements layer 3 and layer 2 functionality.

[0048] The controller / processor 359 may be associated with a memory 360 that stores program code and data. The memory 360 may be referred to as a computer-readable medium. In the UL, the controller / processor 359 provides demultiplexing between transport channels and logical channels, packet reassembly, deciphering, header decompression, and control signal processing to recover IP packets from the EPC 160. The controller / processor 359 is also responsible for error detection using the ACK and / or NACK protocols to support HARQ operations.

[0049] Similar to the functionality described in connection with DL transmissions performed by the base station 310, the controller / processor 359 provides RRC layer functionality associated with system information (e.g., MIB, SIB) acquisition, RRC connection, and measurement reporting; PDCP layer functionality associated with header compression / decompression, and security (ciphering, deciphering, integrity protection, integrity verification); RLC layer functionality associated with the transfer of upper layer PDUs, error correction via ARQ, concatenation, segmentation, and reassembly of RLC SDUs, re-segmentation of RLC data PDUs, and re-ordering of RLC data PDUs; and MAC layer functionality associated with the mapping between logical channels and transport channels, multiplexing of MAC SDUs onto transport blocks (TBs), demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction via HARQ, priority handling, and logical channel prioritization.

[0050] Channel estimates derived by the channel estimator 358 from reference signals or feedback transmitted by the base station 310 may be used by the TX processor 368 to select an appropriate coding and modulation scheme, and to facilitate spatial processing. The spatial streams generated by the TX processor 368 may be provided to different antennas 352 via separate transmitters 354TX. Each transmitter 354TX may modulate an RF carrier with a respective spatial stream for transmission.

[0051] UL transmissions are processed at the base station 310 in a manner similar to that described in connection with the receiver functionality at the UE 350. Each receiver 318RX receives signals via its respective corresponding antenna 320. Each receiver 318RX recovers the information modulated onto the RF carrier and provides the information to the RX processor 370.

[0052] The controller / processor 375 may be associated with a memory 376 that stores program code and data. The memory 376 may be referred to as a computer-readable medium. In the UL, the controller / processor 375 provides demultiplexing between transport channels and logical channels, packet reassembly, deciphering, header decompression, and control signal processing to recover IP packets from the UE 350. The IP packets from the controller / processor 375 may be provided to the EPC 160. The controller / processor 375 is also responsible for error detection using the ACK and / or NACK protocols to support HARQ operations.

[0053] At least one of the TX processor 368, RX processor 356, and controller / processor 359 may be configured to perform aspects associated with Figure 1 199 as combined.

[0054] At least one of the TX processor 316, RX processor 370, and controller / processor 375 may be configured to perform aspects associated with Figure 1 198 as combined.

[0055] Figure 4 FIG. 400 is a diagram illustrating communication between a base station 402 and a UE 404. Referring to Figure 4 , the base station 402 may transmit a beamformed signal to the UE 404 in one or more of the directions 402a, 402b, 402c, 402d, 402e, 402f, 402g, 402h. The UE 404 may receive the beamformed signal from the base station 402 in one or more receive directions 404a, 404b, 404c, 404d. The UE 404 may also transmit a beamformed signal to the base station 402 in one or more of the directions 404a - 404d. The base station 402 may receive the beamformed signal from the UE 404 in one or more receive directions among 402a - 402h. The base station 402 / UE 404 may perform beam training to determine the best receive and transmit directions for each of the base station 402 / UE 404. The transmit direction and receive direction of the base station 402 may be the same or may be different. The transmit direction and receive direction of the UE 404 may be the same or may be different.

[0056] The UE may need to monitor the quality of the beam it uses to communicate with the base station. For example, the UE can monitor the quality of the signal received via the receiving beam. When a beam failure is detected, a Beam Failure Detection (BFD) procedure can be used to identify problems in the beam quality, and a Beam Recovery Procedure (BRF) can be used. The BFD procedure can indicate whether the link for a specific beam is synchronized or not. To monitor the active link performance, the UE can perform measurements on at least one signal (such as a reference signal (RS)) for beam failure detection. The measurements can include deriving metrics similar to the signal-to-interference-plus-noise ratio (SINR) of the signal, or the RSRP strength or block error rate (BLER) of a reference control channel selected by the base station and / or implicitly derived by the UE based on the existing RRC configuration. The reference signal can include any one of CSI-RS, Physical Broadcast Channel (PBCH), Synchronization Signal (SS), or other reference signals for time and / or frequency tracking, etc. The UE can receive an indication of the reference signal source in combination with BFD for measuring the beam quality. The UE can monitor the reference signal and determine the signal quality of the reference signal, such as the Reference Signal Received Power (RSRP). In some cases, the UE can determine a configured metric of the reference signal, such as the block error rate (BLER). This measurement can indicate the UE's ability to decode transmissions (e.g., DL control transmissions from the base station).

[0057] Thresholds can be defined when tracking the radio link condition, and the thresholds can correspond to RSRP, BLER, etc. that indicate the synchronization condition and / or the non-synchronization condition of the radio link. The "non-synchronized" condition can indicate a poor radio link condition, while the "synchronized" condition can indicate that the radio link condition is acceptable and the UE has the possibility of receiving transmissions sent on the radio link. When the block error rate of the radio link drops below the threshold within a specified time interval (e.g., a time interval of 200 ms), the non-synchronized condition can be declared. When the block error rate of the radio link is higher than the threshold within a second specified time interval (e.g., a time interval of 100 ms), the synchronized condition can be declared. The thresholds and time intervals for determining the synchronized condition and the non-synchronized condition can be the same or different from each other. If the UE receives a threshold number of non-synchronized measurements within a time period, the UE can declare a beam failure.

[0058] When a beam failure is detected, the UE can take appropriate actions to restore the connection. For example, after multiple non-synchronized measurements, the UE can send a beam failure recovery signal to initiate the restoration of the connection with the base station. For example, the UE can be configured by RRC with a beam failure recovery procedure for indicating to the base station that a beam failure has been detected.

[0059] As combined with Figure 4As described, the base station 402 and the UE 104 can communicate on active data / control beams for DL communication and UL communication. The base station and / or the UE can use beam failure recovery procedures to switch to a new beam direction.

[0060] The UE can be configured by the base station for DRX. During the RRC connected state, when there is no data transmission in either direction (UL / DL), the UE transitions to the DRX mode, in which the UE uses sleep and wake cycles to discontinuously monitor the PDCCH channel. In the absence of DRX, the UE monitors the PDCCH in each subframe to check for the presence of downlink data available for the UE. Monitoring the PDCCH consumes the UE's battery power. In the DRX mode, when the UE is in the sleep part of the cycle, the UE does not monitor the PDCCH, which can save battery power.

[0061] The DRX configuration for the UE can be configured by the network in RRC signaling from the base station, such as in the RRC connection establishment request or the RRC connection reconfiguration request.

[0062] The DRX configuration can include the configuration of any one of multiple timers and values, for example, the ON duration Timer, the DRX Inactivity Timer, the DRX Retransmission Timer, the DRX UL Retransmission Timer, the drx-HARQ-RTT-TimerDL, the drx-HARQ-RTT-TimerUL, the long DRX cycle, the value of the DRX Start Offset, the drx-LongCycleStartOffset, the DRX short cycle timer, the short DRX cycle, the drx-SlotOffset, etc. The DRX cycle can include the periodic repetition of the ON duration and the OFF duration during which the UE monitors the PDCCH, which can be referred to as the DRX opportunity. During the OFF duration, the UE does not monitor the PDCCH. The UE can enter a sleep mode or a low-power mode, in which the UE minimizes power consumption by turning off the radio frequency (RF) function without detecting communication from the base station.

[0063] The DRX Inactive Timer gives a time, e.g., in terms of TTI duration, after which the UE can enter the Off Duration again after successfully decoding the PDCCH. When the UE wakes up from the Off Duration in the DRX cycle, the On Duration Timer can give the number of consecutive PDCCH subframes to be monitored / decoded. The DRX Retransmission Timer can give the UE a consecutive number of PDCCH subframes to monitor when the UE expects retransmission. The DRX Short Cycle can correspond to the first DRX cycle the UE enters after the DRX Inactive Timer has successfully expired. The UE can be in the Short DRX Cycle until the DRX Short Cycle Timer expires. After that, the UE can enter the Long DRX Cycle. The DRX Short Cycle Timer can be a parameter that gives the number of consecutive subframes after the expiration of the DRX Inactive Timer for which the UE should follow the Short DRX Cycle.

[0064] Therefore, after a successful attempt at DL data, the DRX Inactive Timer can be started for multiple subframes. If there is any UL or DL data transmission during the DRX Inactive Timer, the timer will restart. If the DRX Inactive Timer expires without UL / DL activity, the UE can enter the DRX cycle for power saving. The UE can start with the Short DRX Cycle. If the Short Cycle Timer expires, the UE can enter a longer DRX Cycle. The UE may also be able to transition to Idle Mode DRX based on the RRC Inactive Timer.

[0065] Although DRX provides battery savings for the UE, DRX poses challenges for UEs performing BFD. The Beam Failure Indication Period can be set as a set for the UE to evaluate the radio link quality The maximum value between the shortest period of the periodic CSI-RS configuration or SS / PBCH block in

[0066] The UE may perform measurements on the RS during the beam failure indication period, which may be based on the UE's DRX cycle and the period of the RS configured for beam failure detection. In some examples, the beam failure indication period may be based on the maximum value between the shortest period of the RS used to evaluate the radio link quality and the DRX cycle. In some examples, the period of the RS may be greater than the DRX cycle. This will cause the UE to perform radio link quality measurements according to the period of the RS. In other examples, the DRX cycle may be greater than the period of the RS. This will cause the UE to perform radio link quality measurements according to the DRX cycle. For example, the UE may perform a radio link quality measurement once during the DRX cycle (e.g., during the on-duration).

[0067] Figure 5 Example 500 of a DRX configuration according to certain aspects of the present disclosure is shown. In Figure 5 Example 500, the UE has a DRX configuration 502 and a configuration for the periodic RS 504. The DRX cycle includes an on-duration 506 and an off-duration 508. The combination of the on-duration 506 and the off-duration 508 forms the DRX cycle for the UE. The periodic RS 504 has a period that extends between transmissions of the RS, as Figure 5As shown. The network configures the DRX cycle of the UE and configures the RS cycle of the periodic RS. For the on duration 506, the UE is in the powered-on state, enabling the UE to monitor the PDCCH to determine whether the UE is scheduled to receive data from the network. During the off duration 508, the UE can enter a power-saving mode, in which the UE does not monitor the PDCCH. Although the first on duration 506 of the UE's DRX cycle 515 is shown as aligned with the periodic RS 504 such that the RS will be received by the UE during the on duration, this is only an example.

[0068] In Figure 5 the example of, the periodicity of the RS is greater than the DRX cycle. For example, the length of the RS cycle 517 > the length of the DRX cycle 515.

[0069] The UE can determine the beam failure indication period 514 during which the UE will measure the radio link quality. The beam failure indication period 514 can be based on the UE's DRX cycle and the periodicity of the RS configured for beam failure detection. For example, the UE can determine the beam failure detection period as the maximum value between the shortest periodicity of the RS and the DRX cycle. In this case, the UE compares the UE's DRX cycle with the periodicity of the RS. In Figure 5In the example, the periodicity of the RS (RS period 517) is greater than the DRX period 515. Thus, the UE determines the beam failure indication period 514 based on the periodicity of the RS. In such an example, the UE can be configured to follow the periodicity of the RS to perform BFD. The UE can perform radio link quality measurements during the on-duration 506 of the DRX period and during the transmission of the RS that is periodic of the RS transmission window 510. For example, in some aspects, when the UE is in the on-duration 506 of the DRX period and the periodic RS 504 is within the RS transmission window 510, the UE can perform radio link quality measurements at 516 and 518. In some aspects, since the RS period 517 is longer than the DRX period 515, the on-duration of the UE may not align with the RS transmission window (e.g., 510'), such that the UE is in the off-duration of the DRX period 515 and the UE will not be required to wake up during the off-duration to measure the radio link quality. However, in some aspects, the UE can sometimes be configured to wake up during the off-duration to measure the radio link quality, such as at 520. The UE can wake up during the off-duration to measure the RS 510', but the network may not require the UE to do so. For example, if the RS transmission window 510 overlaps with the DRX on-duration 506, the base station can configure the UE to only measure the radio link quality. In one embodiment, if the RS transmission window 510 does not overlap with the on-duration 506 of the DRX, the UE can measure a signal different from the periodic RS during the on-duration of the DRX. The UE can determine on its own whether to wake up during the off-duration to measure the RS 510'. Example measurement timings are shown at 516, 518, and 520.

[0070] Figure 6 Another example 600 of a DRX configuration in accordance with certain aspects of the present disclosure is shown. In Figure 6 Example 600, the UE has a DRX configuration 602 and a periodic RS 604. The DRX period 615 has an on-duration 606 and an off-duration 608. The combination of the on-duration 606 and the off-duration 608 forms the DRX cycle of the UE. The periodic RS 604 is sent in a periodic manner, where the RS transmissions are separated by the RS period 617. The DRX period 615 and the periodic RS 604 can be configured in a manner similar to the DRX period 515 and the periodic RS 504 described above, respectively.

[0071] In Figure 6 the example, the periodic RS 604 has a period 617 that is shorter than the DRX period 615. As combined with Figure 5As discussed, the beam failure indication period 614 can be based on the UE's DRX cycle and the periodicity of the RS configured for beam failure detection. For example, the UE can determine the beam failure detection period as the maximum value between the shortest period of the RS and the DRX cycle. The UE compares the DRX cycle of the UE with the periodicity of the RS and determines that the DRX cycle is greater than the periodicity of the RS. In Figure 6 the example of, the beam failure indication period 614 will be based on the DRX cycle 615. In such an example, the UE can then be configured to measure the radio link quality a defined number of times (e.g., once) in the DRX cycle, rather than measuring each instance of the RS in the DRX cycle. The UE can perform radio link quality measurements during the on-duration 606 of the DRX cycle. For example, at 616, the UE is in the on-duration 606 of the DRX cycle 615 and can receive the periodic RS 604 at 616 to perform a measurement of the radio link quality, and can perform similar measurements at 618, 620. Since the periodicity of the RS is less than the DRX cycle, the periodic RS 604 can be sent multiple times during the beam failure indication period 614. In some cases, when the UE is in the DRX off-duration 608 of the DRX cycle, the base station can send the RS. As explained, the UE can skip the measurement of the RS sent by the base station during the off-duration and can instead use the reference signal received during the on-duration (which can be different from the periodic RS 604 within the RS transmission window 610) to measure the link quality. This can avoid requiring the UE to wake up during the DRX off-duration 608 to perform any radio link quality measurements. The UE may not monitor the RS for BFD during the off-duration 608 and can remain in the power-off mode or power reduction mode during the off-duration 608.

[0072] Figure 7 FIG. shows an example of communication 700 between a base station 704 and a UE 702. According to Figure 5 and Figure 6 the examples 500, 600, the base station 704 can be configured to determine the length of the DRX cycle of the UE, respectively. The base station 704 can correspond to, for example, base stations 102, 180, 310, 402, 1250, devices 902 / 902'. The UE 702 can correspond to, for example, UEs 104, 350, 404, 950, devices 1202 / 1202'. The communication between the base station 704 and the UE 702 can include beamformed communication, as described in connection with Figure 4 One or more of the illustrated operations can be omitted, transposed, or performed simultaneously. Optional aspects are shown in dashed lines.

[0073] At 706, the base station 704 determines the length of the DRX cycle of the UE. In some examples, the DRX cycle can be based on the latency sensitivity of the UE. In some examples, the base station can be configured to determine the latency sensitivity of the UE. Latency sensitivity can be the sensitivity to latency, which can be based on the latency requirements of the application. For example, for Voice over IP (VOIP), jitter may be limited to no more than 40 ms. This may impose a limit on the DRX cycle, such as limiting it to no more than 40 ms, because a new DL packet that arrives immediately after the UE enters the off duration will have to wait for the entire off duration to send the data to the UE. Latency sensitivity can also correspond to the latency requirements for beam failure detection and beam failure recovery. The latency requirements for BFD / BFR may depend on the reliability or interruption requirements of the application running on the UE. In some examples, such as based on the reliability and / or interruption requirements of the application on the UE, when the UE is more sensitive to the latency in beam failure detection, the base station can determine a shorter length of the DRX cycle. In some examples, when the UE is less sensitive to the latency in beam failure detection, the base station can determine a longer length of the DRX cycle. At 708, the base station 704 determines the DRX configuration based on the DRX cycle determined at 706. The DRX configuration has a DRX cycle including a DRX on duration and a DRX off duration. At 710, the base station 704 sends the DRX configuration with the DRX cycle to the UE, for example, the UE can be configured with DRX. At 712, the base station sends a periodic RS configured for beam failure detection. Although shown as a single line, the periodic transmission of the RS will include multiple periodic transmissions of the RS, as illustrated in conjunction with Figure 5 and 6 described. In some examples, the base station can be configured to apply different parameter sets for the beam failure detection procedure when the UE is in the DRX mode. The different parameter sets can include at least one of a failure detection counter for the DRX mode and a failure detection timer for the DRX mode. The parameters

[0074] can be indicated to the UE in the DRX configuration sent at 710. When the UE 702 receives the DRX configuration with a DRX cycle including a DRX on duration and a DRX off duration from the base station 704, at 714, the UE determines the beam failure indication period. The beam failure indication period can be based on the periodicity of the RS configured for beam failure detection and the DRX cycle, as described in the examples in conjunction with Figure 5 and Figure 6 . In some examples, the beam failure indication period can be determined as the maximum value between the shortest periodicity of the RS used by the UE to assist in radio link quality and the DRX cycle.

[0075] At 716, the UE 702 may be configured to perform radio link quality measurements for at least one of the RSs. The radio link quality measurements of the RSs may be performed based on a beam failure indication period determined by the UE. For example, when the periodicity of the RS is greater than the DRX period, the UE may perform radio link quality measurements according to the periodicity of the RS. When the periodicity of the RS is less than the DRX period, the UE may perform a radio link quality measurement once during the DRX period. In this case, the measurement may be performed during the DRX start duration of the DRX period.

[0076] At 718, the UE 702 may wake up before the DRX on of the DRX cycle to perform radio link quality measurements. At 720, the UE 702 may detect a beam failure. When detecting a beam failure, the UE 702 may initiate a beam failure recovery procedure before the on duration of the DRX cycle. This may ensure good beam quality or enable the UE to initiate BFR before the on duration, so that the UE is ready to receive data during the on duration.

[0077] Figure 8 Is a flowchart 800 of a wireless communication method. The method may be performed by a base station or a component of a base station (e.g., base station 102, 180, 310, 402, 704, 1250, device 902 / 902'; processing system 1014, which may include a memory 376 and which may be the entire base station 310 or a component of the base station 310, such as a TX processor, an RX processor 370, and / or a controller / processor 375) communicating with a UE (e.g., UE 104, 350, 404, 702, 950, device 1202 / 1202'). Optional aspects are shown in dashed lines. The method may enable the base station to configure a DRX period for the UE based on the UE's delay sensitivity.

[0078] At 802, the base station may determine the length of the DRX cycle of the UE based on the latency sensitivity of the UE. For example, the DRX cycle component 906 of the apparatus 902 may perform the determination. Thus, the base station may determine the latency sensitivity of the UE. The latency sensitivity may be the sensitivity to latency, which may be based on the latency requirements of the application. For example, for VOIP, the jitter may be limited to no more than 40 ms. This may impose a limit on the DRX cycle, for example, limiting it to no more than 40 ms, because a new DL packet that arrives immediately after the UE enters the off duration will have to wait for the entire off duration to send the data to the UE. The latency sensitivity may also correspond to the latency requirements for beam failure detection and beam failure recovery. The latency requirements for BFD / BFR may depend on the reliability or interruption requirements of the application running on the UE. The base station determines the length of the DRX cycle. In some examples, when the UE is more sensitive to the latency in beam failure detection, the base station may determine a shorter length of the DRX cycle. In some examples, when the UE is less sensitive to the latency in beam failure detection, the base station may determine a longer length of the DRX cycle. The base station may determine the length of the DRX cycle of the UE according to Figure 5 and Figure 6 Examples 500 and 600 of

[0079] At 804, based on the length of the DRX cycle determined at 802, the base station may configure the UE with a DRX configuration having a DRX cycle including a DRX on duration and a DRX off duration. For example, the DRX configuration component 908 of the apparatus 902 may perform the configuration. Figure 7 Example 708 showing the base station configuring the UE with a DRX configuration having a DRX cycle including a DRX on duration and a DRX off duration is shown. As part of configuring the UE with a DRX configuration, at 806, the base station may send the DRX configuration to the UE, the DRX configuration having an indication of a DRX cycle including a DRX on duration and a DRX off duration. For example, the transmission component 912 may perform the DRX configuration transmission. Figure 7 Example of the base station sending a DRX configuration to the UE at 710 is shown, the DRX configuration having a DRX cycle including a DRX on duration and a DRX off duration.

[0080] At 808, the base station transmits periodic RS configured for beam failure detection, for example, as illustrated by the examples of Figure 5 and 6 For example, the periodic RS component 910 may perform the transmission. Figure 7An example 712 is shown in which a base station transmits periodic RSs configured for beam failure detection to a UE. In some examples, when the UE is in DRX mode, the UE may apply different parameter sets to the beam failure detection procedure. The different parameter sets may include at least one of a failure detection counter for DRX mode and a failure detection timer for DRX mode. However, other parameters may be utilized, and the present disclosure is not intended to be limited to the aspects disclosed herein. In one example, the different parameters may be determined by the base station and indicated to the UE.

[0081] Figure 9 is a conceptual data flow diagram 900 illustrating the data flow between different components / elements in an example apparatus 902. The apparatus may be a base station or a component of a base station (e.g., base station 102, 180, 310, 402, 704, 1250, apparatus 902 / 902') that wirelessly communicates with a UE (e.g., UE 104, 350, 404, 702, 950, apparatus 1202 / 1202'). The apparatus includes: a receiving component 904 that receives uplink communication from UE 950, and a transmitting component 912 that transmits downlink communication to UE 950. The apparatus includes a DRX cycle component 906 that determines the length of the DRX cycle for the UE, e.g., as described in 802 in conjunction with Figure 8 In some examples, the apparatus may determine the delay sensitivity of the UE. The delay sensitivity may be determined based on at least one of the mobility of the UE, the channel conditions encountered by the UE, or the reliability or interruption requirements of the application. The DRX cycle component 906 determines the length of the DRX cycle for the UE, as described in conjunction with Figure 5 and 6 The length of the DRX cycle may be based on the delay sensitivity of the UE. The apparatus includes a DRX configuration component 908 that configures the UE with a DRX configuration having a DRX cycle including a DRX on duration and a DRX off duration, e.g., as described in 804 in conjunction with Figure 8 The apparatus includes a periodic RSs component 910 to cause the apparatus to transmit periodic RSs configured for beam failure detection, e.g., as described in 808 in conjunction with Figure 8

[0082] The apparatus may include additional components that execute each block of the algorithms in the foregoing flowcharts of Figure 7 and Figure 8 Thus, Figure 7 and Figure 8Each block in the above-mentioned flowchart can be executed by a component, and the apparatus may include one or more of those components. These components can be one or more hardware components specifically configured to execute the process / algorithm, implemented by a processor configured to execute the process / algorithm, stored in a computer-readable medium for implementation by a processor, or some combination thereof.

[0083] Figure 10 FIG. 1000 is a diagram illustrating an example of a hardware implementation of an apparatus 902' employing a processing system 1014. The processing system 1014 can be implemented to have a bus architecture generally represented by a bus 1024. Depending on the specific application and overall design constraints of the processing system 1024, the bus 1014 can include any number of interconnecting buses and bridges. The bus 1024 links together various circuits, including one or more processors and / or hardware components (represented by processors 1004, components 904, 906, 908, 910, 912, and computer-readable medium / memory 1006). The bus 1024 can also link various other circuits, such as a timing source, peripherals, voltage regulators, and power management circuits, which are well known in the art and will not be described further herein.

[0084] The processing system 1014 can be coupled to the transceiver 1010. The transceiver 1010 is coupled to one or more antennas 1020. The transceiver 1010 provides components for communicating with various other devices via a transmission medium. The transceiver 1010 receives signals from the one or more antennas 1020, extracts information from the received signals, and provides the extracted information to the processing system 1014 (specifically, the receiving component 904). Additionally, the transceiver 1010 receives information from the processing system 1014 (specifically, the transmitting component 912) and generates signals to be applied to the one or more antennas 1020 based on the received information. The processing system 1014 includes a processor 1004 coupled to a computer-readable medium / memory 1006. The processor 1004 is responsible for general processing, including the execution of software stored on the computer-readable medium / memory 1006. The software, when executed by the processor 1004, causes the processing system 1014 to perform the various functions described above for any particular device. The computer-readable medium / memory 1006 can also be used to store data manipulated by the processor 1004 when executing the software. The processing system 1014 further includes at least one of components 904, 906, 908, 910, 912. These components can be software components running in the processor 1004, software components resident / stored in the computer-readable medium / memory 1006, one or more hardware components coupled to the processor 1004, or some combination thereof. The processing system 1014 can be a component of the base station 310 and can include a memory 376 and / or at least one of the following: a TX processor 316, an RX processor 370, and a controller / processor 375. Alternatively, the processing system 1014 can be the entire base station (e.g., see Figure 3 of 310).

[0085] In one configuration, a device 902 / 902' for wireless communication includes: components for determining the length of a DRX cycle for a user equipment (UE) based on the UE's delay sensitivity; components for configuring the UE with a DRX configuration having a DRX cycle including a DRX-on duration and a DRX-off duration; components for transmitting a periodic reference signal (RS) configured for beam failure detection; and components for determining the UE's delay sensitivity. The foregoing components can be one or more of the components of the processing system 1014 of the device 902' and / or the foregoing components of the device 902 configured to perform the functions recited by the foregoing components. As described above, the processing system 1014 can include a TX processor 316, an RX processor 370, and a controller / processor 375. Thus, in one configuration, the foregoing components can be the TX processor 316, the RX processor 370, and the controller / processor 375 configured to perform the functions recited by the foregoing components.

[0086] Figure 11 FIG. 1100 is a flow chart of an example method of wireless communication. The method may be performed by a UE or a component of the UE (e.g., UE 104, 350, 404, 702, 950, apparatus 1202 / 1202'; processing system 1314, which may include memory 360 and may be an entire UE 350 or a component of UE 350, such as TX processor 368, RX processor 356, and / or controller / processor 359) communicating with a base station (e.g., base stations 102, 180, 310, 402, 704, 1250, apparatus 902 / 902'). Optional aspects are shown in dashed lines. The method may enable the UE to benefit from power savings of DRX when performing BFD by not requiring the UE to wake up during the DRX off duration to perform BFD measurements and ensuring that the UE performs BFD measurements during the DRX active time or on duration.

[0087] At 1102, the UE receives a DRX configuration having a DRX cycle including a DRX on duration and a DRX off duration. The length of the DRX cycle may be based on the latency sensitivity of the UE. For example, the DRX component 1206 of apparatus 1202 may receive the DRX configuration. Figure 7 An example is shown at 710 where the UE receives a signal from a base station. The signal provides a DRX configuration having a DRX cycle including a DRX on duration and a DRX off duration. At 1104, the UE may receive periodic RSs configured for beam failure detection. For example, the receiving component 1204 may receive the periodic RSs. Figure 7 An example 712 is shown where the UE receives periodic RSs configured for beam failure detection. At 1106, the UE may determine a beam failure indication period based on the periodicity of the RSs configured for beam failure detection and the DRX cycle. The beam failure indication period may be determined as the maximum value between the shortest periodicity of the RSs and the DRX cycle. For example, the beam failure indication period component 1208 may perform the determination. Figure 7 An example 714 is shown where the UE determines the beam failure indication period.

[0088] At 1108, the UE performs radio link quality measurements on at least one of the RSs based on the beam failure indication period determined by the UE. For example, the radio link quality measurement component 1210 may perform the measurements. When the periodicity of the RSs is greater than the DRX cycle, the UE may perform radio link quality measurements according to the periodicity of the RSs. When the periodicity of the RSs is less than the DRX cycle, the UE performs a radio link quality measurement once during the DRX cycle. The radio link quality measurements may be performed during the DRX on duration of the DRX cycle. Figure 7An example 716 in which the UE performs radio link quality measurement is shown.

[0089] At 1110, the UE can be configured to wake up before the DRX-on duration of a DRX cycle to perform radio link quality measurement. For example, the wake-up component 1214 can perform the wake-up of the UE. Figure 7 An example 718 in which the UE wakes up before the DRX-on duration of a DRX cycle to perform radio link quality measurement is shown. At 1112, the UE can detect a beam failure and initiate a beam failure recovery procedure before the DRX-on duration of the DRX cycle. For example, the beam failure detection component 1216 can perform the detection, and the beam failure recovery component 1218 can perform the recovery procedure. Figure 7 An example 720 in which the UE detects a beam failure and initiates a beam failure recovery procedure before the DRX-on duration of a DRX cycle is shown.

[0090] Figure 12 It is a conceptual data flow diagram 1200 illustrating the data flow between different components / elements in the exemplary apparatus 1202. The apparatus can be a UE or a component of a UE (e.g., UE 104, 350, 404, 702, 950, apparatus 1202 / 1202') that communicates with a base station (e.g., base stations 102, 180, 310, 402, 704, 1250, apparatus 902 / 902'). The apparatus includes: a receiving component 1204 that receives downlink communication from the base station 1250, and a transmitting component 1212 that sends uplink communication to the base station 1250. The apparatus includes a DRX component 1206 that is configured to receive a DRX configuration from the base station 1250, for example, as described in Figure 11 1102. The DRX configuration can have a DRX cycle including a DRX-on duration and a DRX-off duration. The apparatus includes a beam failure indication period component 1208 that is configured to determine a beam failure indication period based on the periodicity of the RS configured for beam failure detection and the DRX cycle, for example, as described in Figure 11 1106. The apparatus includes a radio link quality measurement component 1210 that is configured to perform radio link quality measurement of at least one of the RSs based on the beam failure indication period determined by the UE, for example, as described in Figure 11As described in 1108. The beam failure indication period can be determined as the maximum value between the shortest periodicity of the RS and the DRX period. When the periodicity of the RS is greater than the DRX period, the UE can perform radio link quality measurements according to the periodicity of the RS. When the periodicity of the RS is less than the DRX period, the UE can perform a radio link quality measurement during the DRX period. This measurement can be performed during the DRX on-duration of the DRX period. The apparatus includes a wake-up component 1214, which is configured to wake up the UE before the DRX on-duration of the DRX cycle to perform radio link quality measurements, such as as described in conjunction with Figure 11 As described in 1110. The apparatus includes a beam failure detection component 1216, which is configured to detect beam failures, such as as described in conjunction with Figure 11 As described in 1112. The apparatus includes a beam failure recovery component 1218, which is configured to initiate a beam failure recovery procedure before the on-duration of the DRX cycle, such as as described in conjunction with Figure 11 As described in 1112.

[0091] The apparatus may include additional components that perform Figure 10 and Figure 11 each block of the algorithms in the foregoing flowcharts. Thus, each block in the foregoing flowcharts of Figure 10 and 11 can be performed by a component, and the apparatus may include one or more of those components. These components may be one or more hardware components specifically configured to perform the process / algorithm, implemented by a processor configured to perform the process / algorithm, stored in a computer-readable medium for implementation by a processor, or some combination thereof.

[0092] Figure 13 FIG. 1300 is a diagram illustrating an example of a hardware implementation of an apparatus 1302' employing a processing system 1314. The processing system 1314 can be implemented to have a bus architecture generally represented by a bus 1324. Depending on the specific application and overall design constraints of the processing system 1324, the bus 1314 can include any number of interconnected buses and bridges. The bus 1324 links together various circuits, including one or more processors and / or hardware components (represented by processor 1304, components 1204, 1206, 1208, 1210, 1212, 1214, 1216, 1218, and computer-readable medium / memory 1306). The bus 1324 can also link various other circuits, such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art and will not be further described herein.

[0093] The processing system 1314 can be coupled to the transceiver 1310. The transceiver 1310 is coupled to one or more antennas 1320. The transceiver 1310 provides components for communicating with various other devices via a transmission medium. The transceiver 1310 receives signals from the one or more antennas 1320, extracts information from the received signals, and provides the extracted information to the processing system 1314 (specifically, the receiving component 1204). Additionally, the transceiver 1310 receives information from the processing system 1314 (specifically, the transmitting component 1212) and generates signals to be applied to the one or more antennas 1320 based on the received information. The processing system 1314 includes a processor 1304 coupled to a computer-readable medium / memory 1306. The processor 1304 is responsible for general processing, including the execution of software stored on the computer-readable medium / memory 1306. The software, when executed by the processor 1304, causes the processing system 1314 to perform the various functions described above for any particular device. The computer-readable medium / memory 1306 can also be used to store data manipulated by the processor 1304 when executing the software. The processing system 1314 further includes at least one of the components 1204, 1206, 1208, 1210, 1212, 1214, 1216, 1218. These components can be software components running in the processor 1304, software components resident / stored in the computer-readable medium / memory 1306, one or more hardware components coupled to the processor 1304, or some combination thereof. The processing system 1314 can be a component of the base station 310 and can include a memory 376 and / or at least one of the following: a TX processor 316, an RX processor 370, and a controller / processor 375. Alternatively, the processing system 1314 can be the entire UE (e.g., see Figure 3 of 350).

[0094] In one configuration, a device 1202 / 1202' for wireless communication includes: components for receiving a DRX configuration having a DRX cycle including a DRX on-duration and a DRX off-duration; components for determining a beam failure indication period based on the periodicity of a reference signal (RS) configured for beam failure detection and the DRX cycle; components for performing radio link quality measurements on at least one of the RSs based on the beam failure indication period determined by the UE; components for waking up before the DRX on-duration of the DRX cycle to perform radio link quality measurements, components for detecting a beam failure, and components for initiating a beam failure recovery procedure before the on-duration of the DRX cycle. The foregoing components may be one or more of the components of the processing system 1314 of the device 1202' and / or the foregoing components of the device 1202 configured to perform the functions recited by the foregoing components. As described above, the processing system 1314 may include a TX processor 368, an RX processor 356, and a controller / processor 359. Thus, in one configuration, the foregoing components may be the TX processor 368, the RX processor 356, and the controller / processor 359 configured to perform the functions recited by the foregoing components.

[0095] The following examples illustrate example embodiments. These embodiments and aspects of these embodiments may be used in conjunction with any previous embodiments or aspects of previous embodiments disclosed or discussed with respect to the systems, methods, or devices of the figures.

[0096] Example 1 is a method for wireless communication at a user equipment (UE), the method including: receiving a DRX configuration having a DRX cycle including a DRX on-duration and a DRX off-duration, determining a beam failure indication period based on the periodicity of a reference signal (RS) configured for beam failure detection and the DRX cycle, and performing radio link quality measurements on at least one of the RSs based on the beam failure indication period determined by the UE.

[0097] In Example 2, the method of Example 1 further includes: the beam failure indication period is determined as the maximum duration between the shortest periodicity of the RS and the DRX cycle.

[0098] In Example 3, any one of the methods of Examples 1-2 may include: when the periodicity of the RS is greater than the DRX cycle, the UE performs radio link quality measurements based on the periodicity of the RS.

[0099] In Example 4, any one of the methods of Examples 1-3 may include: when the periodicity of the RS is less than the DRX cycle, the UE performs radio link quality measurements based on the DRX cycle.

[0100] In Example 5, the method of Example 4 may include: performing measurements during the DRX-on duration of a DRX cycle.

[0101] In Example 6, any one of the methods of Examples 1-5 may include: the length of the DRX cycle is configured based on the delay sensitivity of the UE.

[0102] In Example 7, any one of the methods of Examples 1-6 further includes: waking up before the DRX-on duration of the DRX cycle to perform radio link quality measurements.

[0103] In Example 8, the method of Example 7 further includes: detecting a beam failure and initiating a beam failure recovery procedure before the on duration of the DRX cycle.

[0104] Example 9 is an apparatus that includes one or more processors and a memory that communicates electronically with the one or more processors, the memory storing instructions executable by the one or more processors to cause a system or device to implement the method of any one of Examples 1-8.

[0105] Example 10 is a method of wireless communication at a base station, the method including: determining the length of a DRX cycle of a user equipment (UE) based on the delay sensitivity of the UE; configuring the UE with a DRX configuration having a DRX cycle including a DRX-on duration and a DRX-off duration, and transmitting a periodic reference signal (RS) configured for beam failure detection.

[0106] In Example 11, the method of Example 10 may include: when the UE is more sensitive to the latency in beam failure detection, the base station determines that the DRX cycle has a shorter length.

[0107] In Example 12, any one of the methods of Examples 10-11 may include: when the UE is less sensitive to the latency in beam failure detection, the base station determines that the DRX cycle has a longer length.

[0108] In Example 13, any one of the methods of Examples 10-12 may include: when the UE is in DRX mode, the base station applies a different set of parameters to the beam failure detection procedure.

[0109] In Example 14, the method of Example 13 may include: the different set of parameters includes at least one of a failure detection counter for the DRX mode and a failure detection timer for the DRX mode.

[0110] In Example 15, any one of the methods of Examples 10-14 further includes: determining the delay sensitivity of the UE to the latency in beam failure detection.

[0111] In Example 16, the method of Example 15 may include: the latency sensitivity is determined based on at least one of the reliability or interruption requirements of an application at the UE.

[0112] Example 17 is an apparatus that includes one or more processors and a memory that is in electronic communication with the one or more processors, the memory storing instructions executable by the one or more processors to cause a system or apparatus to implement the method of any one of Examples 10 - 16.

[0113] It should be understood that the specific order or hierarchy of the blocks in the disclosed process / flowchart is an illustration of exemplary approaches. It should be understood that based on design preferences, the specific order or hierarchy of the blocks in these process / flowcharts can be rearranged. Additionally, some blocks may be combined or omitted. The appended method claims present the elements of the various blocks in an exemplary order and are not meant to be limited to the specific order or hierarchy presented.

[0114] The foregoing description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects. Thus, the claims are not intended to be limited to the aspects shown herein but are to be accorded the full scope consistent with the language of the claims, where the recitation of a singular element is not intended to mean "one and only one" unless specifically stated otherwise but rather "one or more." The phrase "exemplary" as used herein means "serving as an example, instance, or illustration." Any aspect described herein as "exemplary" is not necessarily to be construed as preferred or superior to other aspects. Unless specifically stated otherwise, the term "some" refers to one or more. Combinations such as "at least one of A, B, or C," "one or more of A, B, or C," "at least one of A, B, and C," "one or more of A, B, and C," and "any combination of A, B, C, or thereof" include any combination of A, B, and / or C and may include multiples of A, multiples of B, or multiples of C. Combinations such as "at least one of A, B, or C," "one or more of A, B, or C," "at least one of A, B, and C," "one or more of A, B, and C," and "any combination of A, B, C, or thereof" can be A only, B only, C only, A and B, A and C, B and C, or A and B and C, where any such combination can include one or more members of A, B, or C. All structural and functional equivalents of the elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be covered by the claims. Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims. The phrases "module," "mechanism," "element," "device," etc. are not intended to be substitutes for the phrase "component." Thus, no claim element should be construed as a means-plus-function unless the element is expressly recited using the phrase "means for."

Claims

1. A method for wireless communication at a user equipment (UE), comprising: receiving a discontinuous reception (DRX) configuration having a DRX cycle including a DRX-on duration and a DRX-off duration; determining a beam failure indication period based on a maximum value between a shortest periodicity of a reference signal configured for beam failure detection and the DRX cycle; and performing a radio link quality measurement of at least one of the reference signals based on the beam failure indication period determined by the UE; wherein the method further comprises: if transmission of the reference signal occurs during the DRX-off duration, waking up before the next DRX-on duration to perform the radio link quality measurement.

2. The method according to claim 1, wherein the UE performs the radio link quality measurement once during the beam failure indication period.

3. The method according to claim 1, wherein when the UE is in the DRX mode, the UE applies at least one of a failure detection counter or a failure detection timer to the DRX mode to perform the radio link quality measurement.

4. The method according to claim 3, wherein the measurement is performed during the DRX-on duration of the DRX cycle.

5. The method according to claim 1, wherein the length of the DRX cycle is configured based on the delay sensitivity of the UE.

6. The method according to claim 1, further comprising: detecting a beam failure; and initiating a beam failure recovery procedure before the on duration of the DRX cycle.

7. An apparatus for wireless communication at a user equipment (UE), comprising: a memory; and at least one processor coupled to the memory and configured to: receive a DRX configuration having a DRX cycle including a DRX-on duration and a DRX-off duration; determine a beam failure indication period based on a maximum value between a shortest periodicity of a reference signal configured for beam failure detection and the DRX cycle; and perform a radio link quality measurement of at least one of the reference signals based on the beam failure indication period determined by the UE; wherein the at least one processor is further configured to: if transmission of the reference signal occurs during the DRX-off duration, wake up before the next DRX-on duration to perform the radio link quality measurement.

8. The apparatus according to claim 7, wherein the UE performs the radio link quality measurement only once during the beam failure indication period.

9. The apparatus according to claim 7, wherein when the UE is in the DRX mode, the UE applies at least one of a failure detection counter or a failure detection timer to the DRX mode to perform the radio link quality measurement.

10. The apparatus according to claim 9, wherein the measurement is performed during the DRX-on duration of the DRX cycle.

11. The apparatus according to claim 8, Among them, the length of the DRX cycle is configured based on the delay sensitivity of the UE.

12. The apparatus according to claim 7, wherein, the at least one processor is further configured to: detect a beam failure; and initiate a beam failure recovery procedure before the on-duration of the DRX cycle.

13. A computer-readable medium storing computer-executable code for wireless communication at a user equipment (UE), the code when executed causing a processor of the UE to: receive a DRX configuration having a DRX cycle including a discontinuous reception (DRX) on-duration and a DRX off-duration; determine a beam failure indication period based on a maximum value between a shortest periodicity of a reference signal configured for beam failure detection and the DRX cycle; and perform a radio link quality measurement of at least one of the reference signals based on the beam failure indication period determined by the UE; wherein, the code when executed further causes the processor of the UE to: if transmission of the reference signal occurs during the DRX off-duration, wake up before the next DRX on-duration to perform the radio link quality measurement.

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