Timing synchronization of wake-up receivers

Abstract

Certain aspects of the present disclosure provide techniques for receiving a low power synchronization signal (LP-SS) in one or more slots using a first receiver; and monitoring, using the first receiver, a wake-up signal (WUS) associated with a second receiver in a monitoring window based at least in part on the one or more slots in which the LP-SS is received. Certain aspects of the present disclosure provide techniques for outputting an LP-SS in one or more slots; and outputting a WUS in a monitoring window based at least in part on the one or more slots in which the LP-SS is output.

Description

background Technical Field

[0002] Aspects of the present disclosure relate to wireless communications, and more particularly to techniques for timing synchronization of wake-up receivers.

[0003] Description of Related Technology

[0004] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, broadcasts or other similar types of services. These wireless communication systems may employ multiple-access technologies capable of supporting communications with multiple users by sharing available wireless communication system resources with those users.

[0005] Although wireless communication systems have made tremendous technical progress over the years, challenges still exist. For example, complex and dynamic environments can still attenuate or block signals between wireless transmitters and wireless receivers. Accordingly, there is a continued desire to improve the technical performance of wireless communication systems, including, for example: improving the speed and data carrying capacity of communications, improving the efficiency of using shared communication media, reducing the power used by transmitters and receivers when performing communications, improving the reliability of wireless communications, avoiding redundant transmission and / or reception and related processing, improving the coverage area of ​​wireless communications, increasing the number and types of devices that can access wireless communication systems, increasing the ability of different types of devices to communicate with each other, increasing the number and types of wireless communication media available for use, etc. Therefore, there is a need to further improve wireless communication systems to overcome the aforementioned technical challenges and other challenges. Summary of the invention

[0006] One aspect provides a method for wireless communication by a user equipment (UE). The method includes: using a first receiver to receive a low power synchronization signal (LP-SS) in one or more time slots. The method also includes: using the first receiver to monitor a wake-up signal (WUS) associated with a second receiver in a monitoring window based at least in part on the one or more time slots in which the LP-SS is received.

[0007] Another aspect provides a method for wireless communication by a network entity. The method includes: outputting a LP-SS in one or more time slots; and outputting a WUS in a monitoring window based at least in part on the one or more time slots in which the LP-SS is output.

[0008] Other aspects provide: an apparatus operable to, configured to, or otherwise adapted to perform any one or more of the foregoing methods and / or those described elsewhere herein; a non-transitory computer-readable medium comprising instructions that, when executed by a processor of the apparatus, cause the apparatus to perform the foregoing methods and those described elsewhere herein; a computer program product embodied on a computer-readable storage medium, the computer-readable storage medium comprising: code for performing the foregoing methods and those described elsewhere herein; and / or an apparatus comprising components for performing the foregoing methods and those described elsewhere herein. By way of example, an apparatus may include a processing system, a device having a processing system, or a processing system cooperating through one or more networks.

[0009] For purposes of illustration, the following detailed description and drawings set forth certain features. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The accompanying drawings depict certain features of the various aspects described herein and should not be considered to limit the scope of the disclosure.

[0011] Figure 1 An example wireless communication network is depicted.

[0012] Figure 2 An example disaggregated base station architecture is depicted.

[0013] Figure 3 Aspects of an example base station and example user equipment are depicted.

[0014] Figure 4A , Figure 4B , Figure 4C and Figure 4D Various example aspects of data structures for a wireless communication network are described.

[0015] Figure 5 is a diagram illustrating an example of a first receiver and a second receiver of a wireless communication device according to the present disclosure.

[0016] Figure 6 is a diagram illustrating an example of a monitoring window for a wake-up signal (WUS) with clock drift at a UE according to the present disclosure.

[0017] Figure 7 is a diagram illustrating an example of waking up a second receiver according to a WUS according to the present disclosure.

[0018] Figure 8 is a diagram illustrating an example of signaling associated with a low power synchronization signal (LP-SS) for a WUS according to the present disclosure.

[0019] Fig. 9 is a diagram illustrating an example of cover coding of LP-SS for WUS according to the present disclosure.

[0020] Fig.10 is a diagram illustrating an example of modifying a monitoring window for a WUS based at least in part on a configuration of a LP-SS according to the present disclosure.

[0021] Fig.11 is a diagram illustrating an example of a monitoring window based at least in part on a fixed offset from a multi-beam transmission of a LP-SS in accordance with the present disclosure.

[0022] Fig.12 is a diagram illustrating an example of a monitoring window with increasing duration based at least in part on clock drift at a UE in accordance with the present disclosure.

[0023] Fig.13 A method for wireless communication is described.

[0024] Fig.14 A method for wireless communication is described.

[0025] Fig.15 Aspects of an example communications device are depicted.

[0026] Fig.16 Aspects of an example communications device are depicted. DETAILED DESCRIPTION

[0027] Aspects of the present disclosure provide apparatus, methods, processing systems, and computer-readable media for timing synchronization of wake-up receivers.

[0028] The UE may include a first receiver and a second receiver. The first receiver may be a wake-up receiver, such as a low power wake-up receiver. The second receiver may be a main receiver of the UE. A wake-up signal (WUS) may be used to wake up the second receiver. For example, the first receiver may monitor the WUS and may trigger activation of the second receiver upon receipt of the WUS. A low power synchronization signal (LP-SS) may be used to enable synchronization between the UE and the network node and determine the time at which a monitoring window for the WUS occurs so that clock drift between the UE and the network node is mitigated. In some cases, there may be uncertainty about the time associated with the monitoring window relative to the time associated with the LP-SS. When a multi-beam transmission configuration is used, the LP-SS may be transmitted using multiple transmission beams and / or using a repetition configuration for coverage enhancement. That is, the LP-SS burst may include multiple transmission opportunities on which the LP-SS is transmitted, wherein each transmission opportunity corresponds to a different transmission beam and / or number of repetitions. In addition, the opportunity may be mapped to the same time slot or to different time slots for transmission. On the UE side, the LP-SS (transmitted using different beams) may be received at different time periods. If the beam used to transmit the LP-SS or the repetition of the received LP-SS is unknown to the UE, the UE may not know which transmission opportunity corresponds to the received LP-SS. Therefore, the estimated timing of the monitoring window may be incorrect, resulting in failure to receive the WUS, failure to activate the second receiver, and failure to receive downlink communication using the second receiver.

[0029] Some of the techniques described herein include, for example, covering decoding of LP-SS transmissions (e.g., in combination with Fig. 9 As described above), increase the duration of the WUS monitoring window (such as combined Fig.10 and Fig.12 ), or applying a fixed offset between LP-SS and WUS with the same multi-beam transmission configuration and / or repeated configuration (such as in combination with Fig.11 described) to resolve the uncertainty due to unknown beam or repetition number associated with LP-SS.

[0030] Cover decoding the LP-SS transmissions reduces ambiguity regarding the temporal position of the corresponding monitoring window (which may otherwise occur if the UE cannot determine which transmit beam was used to transmit a given group of LP-SS transmissions, or if a given group of LP-SS transmissions are all transmitted using the same transmit beam). Increasing the duration of the monitoring window may reduce complexity at the first receiver (e.g., regarding Fig.12 ), or may eliminate ambiguity as to which of two or more repetitions of the LP-SS should be used to determine the position of the monitoring window (e.g., as to Fig.10Applying a fixed offset between LP-SSs and WUSs having the same multi-beam transmission configuration and / or repetitive configuration eliminates ambiguity about which of the LP-SSs should be used to determine the location of the monitoring window (e.g., about Fig.12 described).

[0031] Introduction to wireless communication networks

[0032] The techniques and methods described herein can be used in various wireless communication networks. Although various aspects may be described herein using terms commonly associated with 3G, 4G and / or 5G wireless technologies, various aspects of the present disclosure may also be applicable to other communication systems and standards not explicitly mentioned herein.

[0033] Figure 1 An example of a wireless communication network 100 is depicted in which various aspects described herein may be implemented.

[0034] In general, the wireless communication network 100 includes various network entities (alternatively, network elements or network nodes). A network entity is typically a communication device and / or a communication function performed by a communication device (e.g., user equipment (UE), base station (BS), component of a BS, server, etc.). For example, various functions of a network and various devices associated with and interacting with the network can be considered network entities. In addition, the wireless communication network 100 includes ground aspects, such as ground-based network entities (e.g., BS 110), and non-ground aspects, such as satellites 140 and aircraft 145, which may include airborne network entities (e.g., one or more BSs) that can communicate with other network elements (e.g., ground BSs) and user equipment.

[0035] In the depicted example, the wireless communication network 100 includes a BS 110, a UE 120, and one or more core networks (such as an evolved packet core (EPC) 160 and a 5G core (5GC) 190) that interoperate to provide communication services over various communication links (including wired and wireless links).

[0036] Figure 1Various example UEs 120 are depicted, which may more generally include: a cellular phone, a smart phone, a Session Initiation Protocol (SIP) phone, a laptop, a personal digital assistant (PDA), a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player, a camera, a game console, a tablet computer, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a large or small kitchen appliance, a healthcare device, an implant, a sensor / actuator, a display, an Internet of Things (IoT) device, an Always-On (AON) device, an edge processing device, or another similar device. UE 120 may also be more generally referred to as a mobile device, a wireless device, a wireless communication device, a station, a mobile station, a subscriber station, a mobile subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a remote device, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, or a handset, etc.

[0037] BS 110 may wirelessly communicate with (e.g., send signals to or receive signals from) UE 120 via communication link 170. Communication link 170 between BS 110 and UE 120 may carry uplink (UL) (also referred to as a reverse link) transmissions from UE 120 to BS 110 and / or downlink (DL) (also referred to as a forward link) transmissions from BS 110 to UE 120. In various aspects, communication link 170 may employ multiple-input multiple-output (MIMO) antenna techniques, including spatial multiplexing, beamforming, and / or transmit diversity.

[0038] BS 110 may generally include: NodeB, enhanced NodeB (eNB), next generation enhanced NodeB (ng-eNB), next generation NodeB (gNB or gNodeB), access point, base transceiver station, radio base station, radio transceiver, transceiver function, transmission and reception point, and / or other. BS 110 may provide communication coverage for corresponding geographic coverage areas 112, which may sometimes be referred to as cells and may overlap in some cases (e.g., a small cell provided by BS 110a may have a coverage area 112' that overlaps with the coverage area 112 of a macro cell). For example, the BS may provide communication coverage for macro cells (covering a relatively large geographic area), pico cells (covering a relatively small geographic area, such as a stadium), femto cells (covering a relatively small geographic area (e.g., a home)), and / or other types of cells.

[0039] Although BS110 is depicted as a single communication device in various aspects, BS110 can be implemented in various configurations. For example, one or more components of the base station can be decomposed, including a central unit (CU), one or more distributed units (DU), one or more radio units (RU), a near real-time (near RT) RAN intelligent controller (RIC), or a non-real-time (non-RT) RIC, to name a few examples. In another example, various aspects of the base station can be virtualized. More generally, a base station (e.g., BS110) can include components located at a single physical location or components located at various physical locations. In an example in which the base station includes components located at various physical locations, the various components can each perform a function so that the various components jointly implement functionality similar to that of a base station located at a single physical location. In some aspects, a base station including components located at various physical locations can be referred to as a decomposed radio access network architecture (such as an open RAN (O-RAN) or virtualized RAN (VRAN) architecture). Figure 2 An example decomposed base station architecture is depicted and described.

[0040] Different BSs 110 within the wireless communication network 100 may also be configured to support different radio access technologies, such as 3G, 4G, and / or 5G. For example, a BS 110 configured for 4G LTE (collectively referred to as the Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN)) may interface with the EPC 160 via a first backhaul link 132 (e.g., an S1 interface). A BS 110 configured for 5G (e.g., 5G NR or Next Generation RAN (NG-RAN)) may interface with the 5GC 190 via a second backhaul link 184. The BSs 110 may communicate with each other directly or indirectly (e.g., via the EPC 160 or the 5GC 190) over a third backhaul link 134 (e.g., an X2 interface), which may be wired or wireless.

[0041] The wireless communication network 100 may subdivide the electromagnetic spectrum into various categories, frequency bands, channels, or other characteristics. In some aspects, subdivision is provided based on wavelength and frequency, where frequency may also be referred to as a carrier, subcarrier, channel, tone, or subband. For example, the Third Generation Partnership Project (3GPP) currently defines frequency range 1 (FR1) as including 410 MHz to 7125 MHz, which is often (interchangeably) referred to as "below 6 GHz". Similarly, 3GPP currently defines frequency range 2 (FR2) as including 24,250 MHz to 52,600 MHz, which is sometimes (interchangeably) referred to as "millimeter wave" ("mmW" or "mmWave"). A base station (e.g., a mmWave base station such as BS110b) configured to communicate using mmWave or near mmWave radio bands may utilize beamforming (e.g., as shown by 182) with a UE (e.g., 120) to improve path loss and range.

[0042] The communication link 170 between the BS 110 and, for example, the UE 120 may be through one or more carriers, which may have different bandwidths (e.g., 5 MHz, 10 MHz, 15 MHz, 20 MHz, 100 MHz, 400 MHz, and / or other bandwidths) and may be aggregated in various aspects. The carriers may or may not be adjacent to each other. In some examples, the allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated for DL ​​compared to UL).

[0043] Communications using higher frequency bands may have higher path loss and shorter range than communications at lower frequencies. Accordingly, certain base stations (e.g., Figure 1182 ′. The base station 110b in the example embodiment may utilize beamforming with the UE 120 to improve path loss and range, as shown at 182. For example, the BS 110b and the UE 120 may each include multiple antennas, such as antenna elements, antenna panels, and / or antenna arrays, to facilitate beamforming. In some cases, the BS 110b may transmit beamformed signals to the UE 120 in one or more transmit directions 182′. The UE 120 may receive the beamformed signals from the BS 110b in one or more receive directions 182″. The UE 120 may also transmit beamformed signals to the BS 110b in one or more transmit directions 182″. The BS 110b may also receive beamformed signals from the UE 120 in one or more receive directions 182′. The BS 110b and the UE 120 may then perform beam training to determine the best receive and transmit directions for each of the BS 110b and the UE 120. It is noteworthy that the transmit direction and receive direction of the BS 110b may be the same or may not be the same. Similarly, the transmit direction and receive direction of UE 120 may or may not be the same.

[0044] The wireless communication network 100 further includes a Wi-Fi access point (AP) 150 that communicates with a Wi-Fi station (STA) 152 via a communication link 154 in, for example, the 2.4 GHz and / or 5 GHz unlicensed spectrum.

[0045] Certain UEs 120 may communicate with each other using a device-to-device (D2D) communication link 158. The D2D communication link 158 may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH), a physical sidelink discovery channel (PSDCH), a physical sidelink shared channel (PSSCH), a physical sidelink control channel (PSCCH), and / or a physical sidelink feedback channel (PSFCH).

[0046] The EPC 160 may include various functional components, including: a mobility management entity (MME) 161, other MMEs 162, a serving gateway 163, a multimedia broadcast multicast service (MBMS) gateway 164, a broadcast multicast service center (BM-SC) 165, and / or a packet data network (PDN) gateway 166, such as in the depicted example. The MME 161 may communicate with a home subscriber server (HSS) 167. The MME 161 is a control node that handles signaling between the UE 120 and the EPC 160. Generally speaking, the MME 161 provides bearer and connection management.

[0047] Generally, user Internet Protocol (IP) packets are delivered through a Serving Gateway 163, which itself is connected to a PDN Gateway 166. The PDN Gateway 166 provides UE IP address allocation and other functions. The PDN Gateway 166 and the BM-SC 165 are connected to IP Services 168, which may include, for example, the Internet, an Intranet, an IP Multimedia Subsystem (IMS), a Packet Switched (PS) streaming media service, and / or other IP services.

[0048] BM-SC 165 may provide functions for MBMS user service deployment and delivery. BM-SC 165 may serve as an entry point for content provider MBMS transmissions, may be used to authorize and initiate MBMS bearer services in a public land mobile network (PLMN), and / or may be used to schedule MBMS transmissions. MBMS Gateway 164 may be used to allocate MBMS services to BSs 110 belonging to a multicast broadcast single frequency network (MBSFN) area of ​​a broadcast specific service, and / or may be responsible for session management (start / stop) and for collecting eMBMS-related billing information.

[0049] 5GC 190 may include various functional components, including: access and mobility management function (AMF) 191, other AMFs 192, session management function (SMF) 193, and user plane function (UPF) 194. AMF 191 may communicate with unified data management (UDM) 195.

[0050] AMF 191 is a control node that processes signaling between UE 120 and 5GC 190. AMF 191 provides, for example, Quality of Service (QoS) flow and session management.

[0051] IP packets are delivered through UPF 194, which is connected to IP services 196 and provides UE IP address allocation and other functions for 5GC 190. IP services 196 may include, for example, the Internet, intranet, IMS, PS streaming services, and / or other IP services.

[0052] In various aspects, a network entity or network node may be implemented as a converged base station, a decomposed base station, a component of a base station, an integrated access and backhaul (IAB) node, a relay node, a sidelink node, or a transmit receive point (TRP), to name a few examples.

[0053] Figure 2An example disaggregated base station 200 architecture is depicted. The disaggregated base station 200 architecture may include one or more central units (CUs) 210 that may communicate directly with a core network 220 via a backhaul link, or indirectly with a core network 220 through one or more disaggregated base station units, such as a near real-time (near-RT) RAN intelligent controller (RIC) 225 via an E2 link, or a non-real-time (non-RT) RIC 215 associated with a service management and orchestration (SMO) framework 205, or both. The CU 210 may communicate with one or more distributed units (DUs) 230 via respective midhaul links, such as an F1 interface. The DU 230 may communicate with one or more radio units (RUs) 240 via respective fronthaul links. The RU 240 may communicate with respective UEs 120 via one or more radio frequency (RF) access links. In some implementations, a UE 120 may be served simultaneously by multiple RUs 240.

[0054] Each of the units (e.g., CU 210, DU 230, RU 240, and near-RT RIC 225, non-RT RIC 215, and SMO framework 205) may include or be coupled to one or more interfaces configured to receive or send signals, data, or information (collectively referred to as signals) via a wired or wireless transmission medium. Each of these units or an associated processor or controller that provides instructions to the communication interface of these units may be configured to communicate with one or more of the other units via a transmission medium. For example, these units may include a wired interface configured to receive or send signals to one or more of the other units via a wired transmission medium. Additionally or alternatively, a unit may include a wireless interface that may include a receiver, a transmitter, or a transceiver (such as an RF transceiver) configured to receive or send signals or both to one or more of the other units on a wireless transmission medium.

[0055] In some aspects, CU 210 may host one or more higher layer control functions. Such control functions may include radio resource control (RRC), packet data convergence protocol (PDCP), service data adaptation protocol (SDAP), etc. Each control function may be implemented using an interface configured to communicate signals with other control functions hosted by CU 210. CU 210 may be configured to handle user plane functionality (e.g., central unit-user plane (CU-UP)), control plane functionality (e.g., central unit-control plane (CU-CP)), or a combination thereof. In some specific implementations, CU 210 may be logically split into one or more CU-UP units and one or more CU-CP units. When implemented in an O-RAN configuration, the CU-UP unit may communicate bidirectionally with the CU-CP unit via an interface (such as an E1 interface). As needed, CU 210 may be implemented to communicate with DU230 for network control and signaling.

[0056] DU 230 may correspond to a logical unit that includes one or more base station functions for controlling the operation of one or more RUs 240. In some aspects, DU 230 may host one or more of a radio link control (RLC) layer, a medium access control (MAC) layer, and one or more high physical (PHY) layers (such as modules for forward error correction (FEC) encoding and decoding, scrambling, modulation and demodulation, etc.) at least in part according to a functional split such as defined by the Third Generation Partnership Project (3GPP). In some aspects, DU 230 may further host one or more low PHY layers. Each layer (or module) may be implemented using an interface that is configured to communicate signals with other layers (and modules) hosted by DU 230 or with control functions hosted by CU 210.

[0057] Lower layer functionality may be implemented by one or more RUs 240. In some deployments, a RU 240 controlled by a DU 230 may correspond to a logical node that hosts RF processing functions or low PHY layer functions (such as performing Fast Fourier Transform (FFT), Inverse FFT (iFFT), digital beamforming, physical random access channel (PRACH) extraction and filtering, etc.), or both, based at least in part on a functional split (such as a lower layer functional split). In such an architecture, the RU 240 may be implemented to handle over-the-air (OTA) communications with one or more UEs 120. In some implementations, real-time and non-real-time aspects of control plane and user plane communications with the RU 240 may be controlled by the corresponding DU 230. In some scenarios, this configuration may enable the implementation of the DU 230 and the CU 210 in a cloud-based RAN architecture (such as a vRAN architecture).

[0058] The SMO framework 205 may be configured to support RAN deployment and provisioning of non-virtualized network elements and virtualized network elements. For non-virtualized network elements, the SMO framework 205 may be configured to support the deployment of dedicated physical resources for RAN coverage requirements, which may be managed via an operation and maintenance interface (such as an O1 interface). For virtualized network elements, the SMO framework 205 may be configured to interact with a cloud computing platform (such as an open cloud (O-Cloud) 290) to perform network element lifecycle management (such as instantiating virtualized network elements) via a cloud computing platform interface (such as an O2 interface). Such virtualized network elements may include, but are not limited to, CU 210, DU 230, RU 240, and near-RT RIC 225. In some specific implementations, the SMO framework 205 may communicate with hardware aspects of the 4G RAN (such as an open eNB (O-eNB) 211) via the O1 interface. Additionally, in some specific implementations, the SMO framework 205 may communicate directly with one or more RUs 240 via the O1 interface. The SMO framework 205 may also include a non-RT RIC 215 configured to support the functionality of the SMO framework 205 .

[0059] The non-RT RIC 215 may be configured to include logic functions that enable non-real-time control and optimization of RAN elements and resources, artificial intelligence / machine learning (AI / ML) workflows including model training and updating, or policy-based guidance of applications / features in the near-RT RIC 225. The non-RT RIC 215 may be coupled to or in communication with the near-RT RIC 225 (such as via an A1 interface). The near-RT RIC 225 may be configured to include logic functions that enable near-real-time control and optimization of RAN elements and resources via data collection and actions through an interface (such as via an E2 interface) that connects one or more CUs 210, one or more DUs 230, or both, and the O-eNB with the near-RT RIC 225.

[0060] In some implementations, in order to generate an AI / ML model to be deployed in the near-RT RIC 225, the non-RT RIC 215 may receive parameters or external enrichment information from an external server. Such information may be utilized by the near-RT RIC 225 and may be received from a non-network data source or from a network function at the SMO framework 205 or the non-RT RIC 215. In some examples, the non-RT RIC 215 or the near-RT RIC 225 may be configured to tune RAN behavior or performance. For example, the non-RT RIC 215 may monitor long-term trends and patterns of performance and employ AI / ML models to perform corrective actions through the SMO framework 205 (such as via reconfiguration of O1) or via creation of RAN management policies (such as A1 policies).

[0061] Figure 3 Aspects of an example BS 110 and UE 120 are depicted.

[0062] In general, BS 110 includes various processors (e.g., 320, 330, 338, and 340), antennas 334a to 334t (collectively 334), transceivers 332a to 332t (collectively 332) including modulators and demodulators, and other aspects that enable wireless transmission of data (e.g., data source 312) and wireless reception of data (e.g., data sink 339). For example, BS 110 can transmit and receive data between BS 110 and UE 120. BS 110 includes a controller / processor 340 that can be configured to implement various functions described herein related to wireless communication.

[0063] In general, the UE 120 includes various processors (e.g., 358, 364, 366, and 380), antennas 352a to 352r (collectively 352), transceivers 354a to 354r (collectively 354) including modulators and demodulators, and other aspects that enable wireless transmission of data (e.g., retrieved from a data source 362) and wireless reception of data (e.g., provided to a data sink 360). The UE 120 includes a controller / processor 380 that can be configured to implement various functions described herein related to wireless communications.

[0064] Regarding example downlink transmissions, BS 110 includes a transmit processor 320 that can receive data from a data source 312 and control information from a controller / processor 340. The control information can be for a physical broadcast channel (PBCH), a physical control format indicator channel (PCFICH), a physical hybrid automatic repeat request (HARQ) indicator channel (PHICH), a physical downlink control channel (PDCCH), a group common PDCCH (GC PDCCH), and / or others. In some examples, the data can be for a physical downlink shared channel (PDSCH).

[0065] The transmit processor 320 may process (e.g., encode and symbol map) data and control information to obtain data symbols and control symbols, respectively. The transmit processor 320 may also generate reference symbols, such as for a primary synchronization signal (PSS), a secondary synchronization signal (SSS), a PBCH demodulation reference signal (DMRS), and a channel state information reference signal (CSI-RS).

[0066] The transmit (TX) multiple-input multiple-output (MIMO) processor 330 may perform spatial processing (e.g., pre-decoding) on ​​data symbols, control symbols, and / or reference symbols where applicable, and may provide an output symbol stream to a modulator (MOD) in transceivers 332a to 332t. Each modulator in transceivers 332a to 332t may process a corresponding output symbol stream to obtain an output sample stream. Each modulator may further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The downlink signals from the modulators in transceivers 332a to 332t may be transmitted via antennas 334a to 334t, respectively.

[0067] To receive downlink transmissions, UE 120 includes antennas 352a through 352r that can receive downlink signals from BS 110 and can provide received signals to demodulators (DEMODs) in transceivers 354a through 354r, respectively. Each demodulator in transceivers 354a through 354r can condition (e.g., filter, amplify, downconvert, and digitize) a corresponding received signal to obtain input samples. Each demodulator can further process the input samples to obtain received symbols.

[0068] A MIMO detector 356 may obtain received symbols from all demodulators in transceivers 354a through 354r, perform MIMO detection on the received symbols if applicable, and provide detected symbols. A receive processor 358 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for UE 120 to a data sink 360, and provide decoded control information to a controller / processor 380.

[0069] For example uplink transmissions, the UE 120 also includes a transmit processor 364 that can receive and process data from a data source 362 (e.g., for a physical uplink shared channel (PUSCH)) and control information from a controller / processor 380 (e.g., for a physical uplink control channel (PUCCH)). The transmit processor 364 can also generate reference symbols for reference signals (e.g., for a sounding reference signal (SRS)). The symbols from the transmit processor 364 can be pre-decoded by the TX MIMO processor 366, if applicable, further processed by the modulators in the transceivers 354a to 354r (e.g., for SC-FDM), and transmitted to the BS 110.

[0070] At BS 110, uplink signals from UE 120 may be received by antennas 334a through 334t, processed by demodulators in transceivers 332a through 332t, detected by MIMO detector 336 where applicable, and further processed by receive processor 338 to obtain decoded data and control information transmitted by UE 120. Receive processor 338 may provide decoded data to data sink 339 and decoded control information to controller / processor 340. Memories 342 and 382 may store data and program codes for BS 110 and UE 120, respectively. Scheduler 344 may schedule UEs for data transmission on the downlink and / or uplink.

[0071] In various aspects, BS 110 may be described as sending and receiving various types of data associated with the methods described herein. In these contexts, "sending" may refer to various mechanisms for outputting data, such as outputting data from a data source 312, a scheduler 344, a memory 342, a transmit processor 320, a controller / processor 340, a TX MIMO processor 330, transceivers 332a to 332t, antennas 334a to 334t, and / or other aspects described herein. Similarly, "receiving" may refer to various mechanisms for obtaining data, such as obtaining data from antennas 334a to 334t, transceivers 332a to 332t, RX MIMO detectors 336, controller / processor 340, receive processor 338, scheduler 344, memory 342, and / or other aspects described herein.

[0072] In various aspects, the UE 120 may also be described as transmitting and receiving various types of data associated with the methods described herein. In these contexts, "transmitting" may refer to various mechanisms for outputting data, such as outputting data from a data source 362, a memory 382, ​​a transmit processor 364, a controller / processor 380, a TX MIMO processor 366, a transceiver 354a to 354t, an antenna 352a to 352t, and / or other aspects described herein. Similarly, "receiving" may refer to various mechanisms for obtaining data, such as obtaining data from an antenna 352a to 352t, a transceiver 354a to 354t, a RX MIMO detector 356, a controller / processor 380, a receive processor 358, a memory 382, ​​and / or other aspects described herein.

[0073] In some aspects, the processor may be configured to perform various operations (such as those associated with the methods described herein) and to send (output) data to another interface configured to send data or receive (obtain) data from another interface configured to receive data, respectively.

[0074] Figure 4A , Figure 4B , Figure 4C and Figure 4D Describes a method for use in a wireless communication network such as Figure 1 Various aspects of the data structure of the wireless communication network 100).

[0075] Specifically, Figure 4A is a diagram 400 illustrating an example of a first subframe within a 5G (e.g., 5G NR) frame structure, Figure 4B is a diagram 430 illustrating an example of a DL channel within a 5G subframe, Figure 4C is a diagram 450 illustrating an example of a second subframe within a 5G frame structure, and Figure 4DFIG480 is a diagram illustrating an example of UL channels within a 5G subframe.

[0076] Wireless communication systems can utilize orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) on both the uplink and downlink. Such systems can also support half-duplex operation using time division duplex (TDD). OFDM and single carrier frequency division multiplexing (SC-FDM) will (for example, Figure 4B and Figure 4D The system bandwidth (as depicted in FIG. 1 ) is divided into multiple orthogonal subcarriers. Each subcarrier can be modulated with data. Modulation symbols can be transmitted in the frequency domain using OFDM and / or in the time domain using SC-FDM.

[0077] The wireless communication frame structure may be frequency division duplex (FDD), where for a particular set of subcarriers, subframes within the subcarrier set are dedicated to either DL or UL. The wireless communication frame structure may also be time division duplex (TDD), where for a particular set of subcarriers, subframes within the subcarrier set are dedicated to both DL and UL.

[0078] exist Figure 4A and Figure 4C In the wireless communication frame structure, TDD is used, where D is DL, U is UL, and F is used flexibly between DL / UL. The UE can be configured with a slot format (dynamically configured by DL control information (DCI) or semi-statically / statically configured by RRC signaling) through a received slot format indicator (SFI). In the depicted example, a 10ms frame is divided into 10 equally sized 1ms subframes. Each subframe may include one or more slots. In some examples, each slot may include 7 or 14 symbols, depending on the slot format. A subframe may also include a microslot, which typically has fewer symbols than an entire slot. Other wireless communication technologies may have different frame structures and / or different channels.

[0079] In certain aspects, the number of slots within a subframe is based on the slot configuration and parameter set. For example, for slot configuration 0, different parameter sets (μ) 0 to 5 allow for 1, 2, 4, 8, 16, and 32 slots per subframe, respectively. For slot configuration 1, different parameter sets 0 to 2 allow for 2, 4, and 8 slots per subframe, respectively. Thus, for slot configuration 0 and parameter set μ, there are 14 symbols per slot and 2 per subframe. μ time slots. The subcarrier spacing and symbol length / duration are functions of the parameter set. The subcarrier spacing can be equal to 2 μ × 15kHz, where μ is parameter set 0 to 5. Accordingly, parameter set μ=0 has a subcarrier spacing of 15kHz, and parameter set μ=5 has a subcarrier spacing of 480kHz. The symbol length / duration is inversely related to the subcarrier spacing. Figure 4A , Figure 4B , Figure 4C and Figure 4D An example is provided for slot configuration 0 with 14 symbols per slot and parameter set μ=2 with 4 slots per subframe. The slot duration is 0.25 ms, the subcarrier spacing is 60 kHz, and the symbol duration is approximately 16.67 μs.

[0080] like Figure 4A , Figure 4B , Figure 4C and Figure 4D As depicted in FIG. 1 , a resource grid may be used to represent a frame structure. Each time slot includes a resource block (RB) (also referred to as a physical RB (PRB)) extending, for example, over 12 consecutive subcarriers. The resource grid is divided into a plurality of resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.

[0081] like Figure 4A As illustrated, some of the REs carry data for UEs (eg, Figure 1 and Figure 3 The RS may include a demodulation RS (DMRS) and / or a channel state information reference signal (CSI-RS) for channel estimation at the UE. The RS may also include a beam measurement RS (BRS), a beam refinement RS (BRRS), and / or a phase tracking RS (PT-RS).

[0082] Figure 4B Examples of various DL channels within a subframe of a frame are illustrated.The Physical Downlink Control Channel (PDCCH) carries DCI within one or more Control Channel Elements (CCEs), each CCE comprising, for example, nine RE Groups (REGs), each REG comprising, for example, four consecutive REs in an OFDM symbol.

[0083] The primary synchronization signal (PSS) may be in symbol 2 of a particular subframe of a frame. The PSS is transmitted by a UE (e.g., Figure 1 and Figure 3 120) is used to determine subframe / symbol timing and physical layer identification.

[0084] A secondary synchronization signal (SSS) may be in symbol 4 of a specific subframe of a frame. The SSS is used by the UE to determine the physical layer cell identity group number and radio frame timing.

[0085] Based on the physical layer identifier and the physical layer cell identifier group number, the UE can determine the physical cell identifier (PCI). Based on the PCI, the UE can determine the location of the aforementioned DMRS. The physical broadcast channel (PBCH) carrying the master information block (MIB) can be logically grouped 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 (such as system information blocks (SIBs)) that is not sent via the PBCH, and / or paging messages.

[0086] like Figure 4C As illustrated, some of the REs carry DMRS for channel estimation at the base station (indicated as R for a particular configuration, but other DMRS configurations are possible). The UE may send DMRS for PUCCH and DMRS for PUSCH. The PUSCH DMRS may be sent, for example, in the first one or two symbols of the PUSCH. The PUCCH DMRS may be sent in different configurations depending on whether a short PUCCH or a long PUCCH is sent and depending on the specific PUCCH format used. UE 120 may send a sounding reference signal (SRS). The SRS may be sent, for example, in the last symbol of a subframe. The SRS may have a comb structure, and the UE may send the SRS on one of the teeth of the comb. The SRS may be used by the base station for channel quality estimation to achieve frequency-dependent scheduling of the UL.

[0087] Figure 4D Examples of various UL channels within a subframe of a frame are illustrated. The PUCCH may be located at a position as indicated in one configuration. The PUCCH carries uplink control information (UCI), such as scheduling requests, channel quality indicator (CQI), precoding matrix indicator (PMI), rank indicator (RI), and HARQ ACK / NACK feedback. The PUSCH carries data and may be used to carry, among other things, a buffer status report (BSR), a power headroom report (PHR), and / or UCI.

[0088] Aspects related to timing synchronization of wake-up receivers

[0089] Figure 55 is a diagram of an example 500 of a first receiver 505 and a second receiver 510 of a wireless communication device according to the present disclosure. The first receiver 505 and the second receiver 510 are components of the UE 120. The first receiver 505 may be referred to as a wake-up receiver (WUR) or a low power WUR (LP-WUR). The first receiver 505 may include a radio receiver circuit, such as an energy detector (e.g., a non-coherent envelope detector). In some aspects, the first receiver 505 may have lower energy consumption than the second receiver 510. The second receiver 510 may be referred to as the main receiver of the UE 120. The second receiver 510 may be capable of being used for data communication of the UE 120. In some aspects, the second receiver 510 may be associated with a transceiver. For example, the second receiver 510 may support both data transmission and data reception.

[0090] When there is no data communication to be received and there is no data communication to be sent, UE 120 can deactivate the second receiver 510 (e.g., power it off to make it inactive). The first receiver 505 can monitor WUS 515 in the monitoring window. When there is data to be received, the network node (e.g., BS110) can send WUS 515 in the monitoring window. The first receiver 505 can receive WUS 515 and can trigger the activation of the second receiver 510. The second receiver 510 can send and / or receive data. The use of the first receiver 505 can provide power saving without causing a trade-off between efficiency and latency, as may be expected in a scenario in which the second receiver 510 is used to monitor wake-up signaling. In addition, the use of the first receiver 505 can provide lower energy consumption than some duty cycle schemes in which the second receiver 510 wakes up to monitor the physical downlink control channel (PDCCH). In some aspects, the first receiver 505 can comply with wireless communication specifications, such as the Institute of Electrical and Electronics Engineers (IEEE) standard 802.11baTM-2021 supporting LP-WUR.

[0091] UE 120 may be associated with a certain amount of clock drift, as described elsewhere herein. Some techniques described herein provide signaling of a low power synchronization signal (LP-SS) to enable synchronization between UE 120 and a network node so that WUS 515 is not received by UE 120 outside of a monitoring window (at UE 120) due to clock drift.

[0092] As indicated above, Figure 5 are provided as examples. Other examples can be found in the Figure 5 The content described is different.

[0093] Figure 6600 is a diagram illustrating an example of a monitoring window for a WUS with clock drift at a UE according to the present disclosure. Example 600 includes a network node (e.g., BS 110) and a UE 120. The network node may output a WUS (e.g., WUS 515) within a monitoring window 605. The UE 120 may monitor (and receive, if sent) the WUS within a monitoring window 610. Thus, example 600 may illustrate a duty cycle for the transmission and reception of the WUS. The UE 120 may activate a first receiver (e.g., first receiver 505) within the monitoring window 610 based at least in part on the duty cycle, and the network node may only send the WUS within the monitoring window 610. Ideally, the monitoring window 605 and the monitoring window 610 are aligned with each other in time (subject to any propagation delay, timing advance, etc. between the UE 120 and the network node). However, in some aspects, the UE 120 may experience clock drift relative to the network node. "Clock drift" may refer to a mismatch of the current time at the UE 120 relative to the network node due to the clock rate of the clock at the UE 120 being different from the clock rate of the clock at the network node. Clock drift may be caused, for example, by oscillator drift at the UE 120. For example, a 0.1 parts per million (ppm) clock inaccuracy at the UE may result in a cumulative timing error of 0.1 microseconds per second. Some techniques described herein provide signaling of the LP-SS so that the UE 120 and the network node can align their monitoring windows 605 and 610 with each other. Taking into account the clock drift at the UE 120, some techniques described herein provide modification of the duration of the monitoring window 605 so that the monitoring window 605 occurs within the duration of the monitoring window 610.

[0094] As indicated above, Figure 6 are provided as examples. Other examples can be found in the Figure 6 The content described is different.

[0095] Figure 7 is a diagram illustrating an example 700 of waking up a second receiver according to a WUS according to the present disclosure. Example 700 shows reception by a first receiver (e.g., first receiver 505) and a second receiver (e.g., second receiver 510) of a UE (e.g., UE 120). As shown, the first receiver may monitor a WUS (e.g., WUS 515) in a monitoring window, which may occur periodically according to a WUS monitoring periodicity. As further shown, the WUS may include a preamble, a payload (e.g., which may include address information indicating the UE or UE group to which the WUS is directed), and a cyclic redundancy check.

[0096] As shown by reference numeral 710, the first receiver may receive a WUS. As shown by reference numeral 720, the WUS (or the first receiver, at least in part based on receiving the WUS) may trigger a second receiver to wake up. The second receiver may wake up during the wake-up time. As shown by reference numeral 730, the second receiver may receive a synchronization signal block (SSB). For example, the UE may synchronize the second receiver based at least in part on the SSB. As shown by reference numeral 730, the second receiver may monitor for paging in a paging occasion (PO).

[0097] As described above, some techniques described herein provide signaling of the LP-SS so that the UE 120 can align a monitoring window for receiving a WUS with the transmission of a WUS by a network node.

[0098] As indicated above, Figure 7 are provided as examples. Other examples can be found in the Figure 7 The content described is different.

[0099] Figure 8 8 is a diagram illustrating an example 800 of signaling associated with LP-SS for WUS according to the present disclosure. Example 800 includes a UE (e.g., UE 120) and a network node. The UE may include a first receiver (e.g., first receiver 505) and a second receiver (e.g., second receiver 510). In some aspects, the network node may be related to Figure 1 and Figure 3 Describing and describing BS110 or about Figure 2 An example of a decomposed base station is depicted and described. Similarly, a UE may be related to Figure 1 and Figure 3 An example of a UE 120 is depicted and described. However, in other aspects, the UE may be another type of wireless communication device, and the network node may be another type of network entity or network node, such as described herein.

[0100] As shown by reference numeral 805, in some aspects, the network node may provide a configuration to the UE. In some aspects, the configuration may indicate one or more time slots in which to monitor the LP-SS. For example, the configuration may include a configuration of resources for the LP-SS. In some aspects, the configuration may indicate one or more parameters associated with receiving the LP-SS, such as a configuration for coverage decoding of the LP-SS (e.g., in conjunction with Fig. 9as described above), a multi-beam transmission configuration associated with the LP-SS (e.g., a resource mapping associated with the multi-beam transmission configuration), a repetition configuration associated with the LP-SS (e.g., indicating the number of repetitions of the LP-SS, a resource mapping associated with the repetition configuration, etc.), a fixed offset between the monitoring windows of the LP-SS and the WUS (e.g., in combination with Fig.11 In some aspects, the configuration may indicate one or more parameters associated with receiving the WUS. For example, the configuration may indicate a monitoring window (e.g., a periodicity of the monitoring window, a duration of the monitoring window, an extended duration of the monitoring window, such as a periodicity of the monitoring window, a duration of the monitoring window, a duration of the monitoring window, etc.). Fig.10 or Fig.12 As described), multi-beam transmission configuration for WUS, repeated configuration for WUS, etc.

[0101] As shown by reference numeral 810, the network node may transmit LP-SS in one or more time slots. For example, the network node may transmit one or more instances of LP-SS in one or more time slots (e.g., one transmission per time slot, multiple transmissions per time slot, or one transmission across multiple time slots). LP-SS is a reference signal that is used to synchronize timing between the UE and the network node so that the UE can determine the time position of the monitoring window for the WUS. For example, LP-SS may be used for time and / or frequency (time / frequency) tracking of the UE's first receiver (e.g., LP-WUR), and may be used for timing recovery when the UE wakes up after sleep (such as long deep sleep) (thereby reducing the need to read the master information block (MIB) to retrieve the system frame number SFN). In some aspects, LP-SS may be transmitted with a longer periodicity than SSB (and / or WUS), as long as the timing uncertainty caused by clock drift between synchronization opportunities (e.g., SSB transmission opportunities or monitoring windows for WUS) is not too large (e.g., less than 1 time slot). In some aspects, LP-SS may use an on-off keying (OOK) configuration. For example, the waveform of LP-SS can use OOK.

[0102] In some aspects, a network node may transmit an LP-SS using a multi-beam transmit configuration. A multi-beam transmit configuration is a configuration in which a signal (in this case, an LP-SS) is transmitted multiple times using different beams. For example, the LP-SS may be transmitted one or more times using a first transmit beam, then one or more times using a second beam, and so on (e.g., one transmission per beam and time resource, multiple transmissions per beam across different time resources, or one transmission using multiple beams simultaneously, and so on). The transmissions of the LP-SS using different beams may be distributed in time, which may be referred to as beam scanning.

[0103] In some aspects, the network node may transmit the LP-SS using a repetition configuration. A repetition configuration is a configuration in which a signal (in this case, LP-SS) is transmitted multiple times on different time resources. In some aspects, the repetition configuration may be combined with a multi-beam transmission configuration such that multiple repetitions of the signal (in this case, LP-SS) are transmitted using a first transmission beam and then multiple repetitions of the signal are transmitted using a second transmission beam.

[0104] LP-SS can be used to determine the time when the monitoring window for WUS occurs so that the clock drift between the UE and the network node is mitigated. In some cases, there may be uncertainty about the time associated with the monitoring window relative to the time associated with the LP-SS. When a multi-beam transmission configuration is used, LP-SS can be transmitted using multiple transmission beams and / or using a repetition configuration for coverage enhancement. That is, the LP-SS burst may include multiple opportunities on which the LP-SS is transmitted, each opportunity corresponding to a different transmission beam and / or number of repetitions. In addition, the opportunity may be mapped to the same time slot or to different time slots for transmission. On the UE side, the LP-SS (transmitted using different beams) may be received at different time periods. For example, the UE may receive an LP-SS transmitted using beam X in a first LP-SS burst, or may receive an LP-SS transmitted using beam Y in a second LP-SS burst, where beam X is different from beam Y. If the beam used to transmit the LP-SS or the repetition of the received LP-SS is not known to the UE, the UE may not know which transmission opportunity corresponds to the received LP-SS. Therefore, the estimated timing of the monitoring window may be incorrect. For example, the estimated timing may be offset by the time difference between the corresponding LP-SS opportunities, thereby causing a timing error as to when the corresponding monitoring opportunity occurs. Encoding an explicit indication of a beam or repetition onto the LP-SS may be challenging, may involve excessive overhead, and may involve multiple hypotheses at the UE (in order to interpret the content of the encoded indication), which increases the complexity at the first receiver 505. Some techniques described herein, such as by performing cover decoding on the LP-SS transmission (e.g., in conjunction with Fig. 9 As described above), increase the duration of the WUS monitoring window (such as combined Fig.10 and Fig.12 described), or applying a fixed offset between the LP-SS and the WUS having the same multi-beam transmission configuration and / or repetition configuration to resolve the uncertainty caused by the unknown beam or repetition number associated with the LP-SS.

[0105] As indicated by reference numeral 815, the UE may utilize a first receiver to receive an LPSRS in one or more time slots. For example, the UE may receive one or more repetitions of the LP-SS. In some aspects, the UE may receive a single instance of the LP-SS (e.g., in a single time slot). In some aspects, the UE may receive two or more instances of the LP-SS (such as in two or more different time slots). The UE may identify a monitoring window for the WUS based at least in part on the LP-SS. For example, the UE may identify a time associated with a monitoring window for the WUS based at least in part on one or more time slots in which the LP-SS is received. In some aspects, the UE may identify a monitoring window based at least in part on a cover code associated with the LP-SS, such as in conjunction with a Fig. 9 In some aspects, the UE may identify the monitoring window based at least in part on the number of time slots configured as one or more time slots (e.g., N time slots), such as in conjunction with Fig.10 In some aspects, the UE may identify a monitoring window based at least in part on a fixed offset relative to one or more time slots, such as in conjunction with Fig.11 In some aspects, the UE may identify the monitoring window based at least in part on the duration of the increase in the monitoring window, such as in conjunction with Fig.12 as described.

[0106] As shown by reference numeral 820, the network node may send a WUS in the monitoring window. As shown by reference numeral 825, the UE may use a first receiver to monitor (and receive) the WUS in the monitoring window. For example, the UE may monitor for a WUS including an address associated with the UE within the monitoring window, as identified in conjunction with reference numeral 815.

[0107] As shown by reference numeral 830, the UE may activate the second receiver according to the WUS. For example, the UE may wake up the second receiver to receive SSB, paging messages, data communication, etc. As shown by reference numeral 835, the UE may perform data communication using the second receiver.

[0108] In some aspects, the WUS includes timing information. The UE may adjust the timing of the second receiver based on the timing information. For example, the WUS may indicate transmit beam information indicating the transmit beam on which the WUS is transmitted so that the timing of the second receiver of the UE may be updated without using the SSB to resynchronize. If the WUS is a packet including a cyclic redundancy check (CRC) (e.g., Figure 7In some aspects, the transmit beam information may be used as a CRC mask to scramble the CRC bits of the WUS, thereby implicitly indicating the transmit beam information. If repetition is used for the WUS, the transmit beam information may use a cover code for two or more repetitions of the WUS (such as a combination of Fig. 9 In some aspects, the UE may adjust the timing of a second receiver of the UE based at least in part on receiving another LP-SS after the WUS. For example, the UE may receive a LP-SS (e.g., an aperiodic LP-SS whose presence is indicated by the WUS) after receiving the WUS, and may synchronize the second receiver based at least in part on the LP-SS.

[0109] As indicated above, Figure 8 are provided as examples. Other examples can be found in the Figure 8 The content described is different.

[0110] Fig. 9 900 is a diagram illustrating an example of cover coding of an LP-SS for a WUS according to the present disclosure. In example 900, the LP-SS is associated with a repetition configuration such that two or more repetitions of the LP-SS are transmitted using a transmit beam. For example, a network node may use a beam with a transmit beam index j to output K transmissions of the LP-SS in K time slots (e.g., one transmission per time slot), and then may use a beam with a transmit beam index k to output K transmissions of the LP-SS in another K time slots (e.g., one transmission per time slot). In example 900, a cover code is applied to a group of K transmissions of the LP-SS such that the LP-SS may be combined across repetitions in an unambiguous manner. For example, a cover code may indicate a transmit beam index of a transmit beam used to transmit the K transmissions of the LP-SS. Different cover codes may be used for different transmit beams. For example, a first cyclic shift version of the cover code may be used to indicate a first transmit beam index, and a second cyclic shift version of the cover code may be used to indicate a second transmit beam index. By using cover decoding of the group of K transmissions of the LP-SS to indicate the transmit beam index, the ambiguity about the time position of the corresponding monitoring window is eliminated (which ambiguity may otherwise occur if the UE cannot determine which transmit beam is used to transmit a given group of K transmissions, or if the given group of K transmissions are all transmitted using the same transmit beam).

[0111] In example 900, a cell identifier associated with a network node is used to generate a base sequence S. A cover code of length K is generated based at least in part on the transmit beam indexes of K transmitted transmit beams used to transmit the LP-SS. The cover code may be cyclically shifted to indicate different transmit beam indices. For example, a first cyclically shifted version a of the cover code may be cyclically shifted to indicate different transmit beam indices. j a j+ 1 ...a K-1 a 0 ...a j-1 The transmit beam index j may be indicated, and the second cyclic shifted version a of the covering code k a k+1 ...a K- 1 a 0 ...a k-1 The transmit beam index k may be indicated. As shown in the figure, the base sequence S and the cover code may be combined and applied to the transmission of the LP-SS. For example, in the first group of K time slots, the repetition of the transmission of the LP-SS using beam j is a cover-coded j S , a j+1 S...a j-1 As another example, in the second group of K time slots, the repetition of the transmission of the LP-SS using beam k is a coverage decoded k S , a k+1 S...a k-1 S. In one example, the cover code may be represented by a sequence having a number of +1 or -1, and the length of the cover code is equal to the number of repetitions. In this case, the LP-SS may be repeated by multiplying the LP-SS by +1 or -1 in each of the K repetition slots.

[0112] As indicated above, Fig. 9 are provided as examples. Other examples can be found in the Fig. 9 The content described is different.

[0113] Fig.10 is a diagram illustrating an example 1000 of modifying a monitoring window for a WUS based at least in part on a configuration of an LP-SS in accordance with the present disclosure. In example 1000, a group of N transmissions (e.g., LP-SS bursts) of an LP-SS is combined with Figure 8The multi-beam transmission configuration configured by reference numeral 805 of FIG. The multi-beam transmission configuration may configure N transmissions of the LP-SS. The N transmissions may be transmitted using a beam scanning configuration. For example, a first transmission (or a first set of transmissions) of the LP-SS may be transmitted using a first beam, a second transmission (or a second set of transmissions) of the LP-SS may be transmitted using a second beam, and so on. In example 1000, for a total of N transmissions of the LP-SS in N time slots, there is one LP-SS transmission per time slot. Each of the N transmissions is associated with the same resource mapping in the corresponding time slot. For example, each transmission may occur in the same symbol (or the same set of symbols) of the time slot in which each transmission is transmitted. If the UE is not aware of which beam is used to transmit the LP-SS (or equivalently, the LP-SS opportunity index on which the LP-SS is received), the UE may not be able to identify which of the N transmissions of the LP-SS is received. Therefore, ambiguity may arise as to when the monitoring window corresponding to the received LP-SS should be placed in time. For example, if an LP-SS burst spans N slots, the uncertainty due to the unknown LP-SS opportunity index may range from one slot to N-1 slots.

[0114] In example 1000, the duration of the monitoring window is adjusted based at least in part on the number of time slots (N) in which the LP-SS is transmitted. For example, the monitoring window may be associated with a default duration, which may be indicated by a configuration of the monitoring window, a rule in a wireless communication specification, or the like. The monitoring window may be associated with an offset relative to the LP-SS burst, which may also be indicated by the configuration of the monitoring window. If the LP-SS burst is configured with N transmissions across N time slots (where N is an integer), and if each of the N transmissions has the same resource mapping within a corresponding time slot, the UE and / or the network node may adjust the duration of the monitoring window. For example, the UE and / or the network node may use a monitoring window with a first number of time slots added to the start of the monitoring window and / or a second number of time slots added to the end of the monitoring window. The first number of time slots and / or the second number of time slots may be based at least in part on N. For example, the first number and the second number may be equal to N-1. Thus, the duration of the monitoring window may be based at least in part on the maximum timing uncertainty of the corresponding LP-SS burst. In some aspects, a network node to configure a monitoring window may configure the monitoring window such that the duration of the monitoring window includes all possible time slots in which a WUS may transmit based at least in part on a maximum timing uncertainty of a corresponding LP-SS burst.

[0115] In some aspects, the WUS may use a repetitive configuration such that the WUS is sent in two or more time slots (e.g., using inter-slot repetition). The first receiver may use multiple hypotheses to receive the WUS within the monitoring window, such as multiple hypotheses with different starting time slot indices for the WUS. Thus, uncertainty about the time associated with the monitoring window is mitigated.

[0116] As indicated above, Fig.10 are provided as examples. Other examples can be found in the Fig.10 The content described is different.

[0117] Fig.11 1 is a diagram illustrating an example 1100 of a monitoring window based at least in part on a fixed offset from a multi-beam transmission of an LP-SS in accordance with the present disclosure. In example 1100, the LP-SS and the WUS have the same repetition configuration and the same multi-beam transmission configuration. For example, the LP-SS transmits in the first two time slots using a first beam and then transmits in the second two time slots using a second beam. The WUS also transmits in the third two time slots using the first beam and then transmits in the fourth two time slots using the second beam. The first two time slots may be separated from the third two time slots by a time slot offset T. The second two time slots may be separated from the fourth two time slots by a time slot offset T.

[0118] The time slot offset T may be a fixed offset. For example, the time slot offset T may be equal for each LP-SS and corresponding WUS transmission. Thus, the time slot offset T is guaranteed to be common for each transmit beam used to transmit the LP-SS. For example, the time slot offset T may be independent of the transmit beam index associated with the received LP-SS. In this way, the UE may use the fixed offset 1130 (e.g., the time slot offset T) to identify the starting point of the monitoring window 1110 based at least in part on the time when the corresponding LP-SS transmission 1120 is received. Thus, the UE 120 does not need to determine the transmit beam index of the LP-SS transmission 1120 in order to identify the starting point of the monitoring window 1110.

[0119] As indicated above, Fig.11 are provided as examples. Other examples can be found in the Fig.11 The content described is different.

[0120] Fig.12 1 is a diagram illustrating an example 1200 of a monitoring window with an increased duration based at least in part on a clock drift at a UE according to the present disclosure. Example 1200 includes a network node (e.g., BS 110) and a UE (e.g., UE 120). It should be noted that example 1200 may be implemented without LP-SS (e.g., in some aspects, Figure 8The transmission and reception of the LP-SS at reference numerals 810 and 815 may be omitted from example 1200).

[0121] In example 1200, the monitoring window for WUS is a periodic monitoring window. For example, the periodic monitoring window may include multiple monitoring windows, which may be separated by monitoring window periodicity. As shown, the first monitoring window 1210 may be associated with the first duration 1220. The second monitoring window 1230 may be associated with the second duration 1240 longer than the first duration 1220. The third monitoring window 1250 may be associated with the third duration 1260 longer than the second duration 1240. The increase duration of the monitoring window may be based at least in part on the clock drift associated with the UE. For example, the UE may report the clock drift, or the network node may determine the clock drift (such as based at least in part on past communications with the UE). The network node may determine the increase of the first duration 1220 or the second duration 1240 at least in part based on the clock drift. For example, taking into account the clock drift, the network node may increase the duration of the monitoring window so that the monitoring window at the network node includes the monitoring window at the UE. For example, in example 1200, the second monitoring window 1230 includes the monitoring window 1270 at the UE taking into account the clock drift 1280 at the UE. Thus, the complexity at the first receiver (eg, first receiver 505) is reduced relative to synchronizing the monitoring window with the LP-SS.

[0122] In some aspects, a guaranteed period in which a discontinuous transmission (DTX) determination for a WUS is not performed can be defined for synchronization with the UE. For example, in example 1200, a WUS for a paging indication can be used to synchronize the first receiver of the UE. However, the sending of the WUS for a paging indication is on demand and only occurs when there is a paging for the UE. Therefore, not every monitoring window can be used to send a WUS for a paging indication. By defining a guaranteed period, a DTX determination for the WUS can be avoided, thereby enabling the UE to synchronize the first receiver.

[0123] As indicated above, Fig.12 are provided as examples. Other examples can be found in the Fig.12 The content described is different.

[0124] Example Operation of User Equipment

[0125] Fig.13 The method for use by a UE such as Figure 1 and Figure 3 Method 1300 for performing wireless communications with a UE 120).

[0126] The method 1300 begins at 1310, where a low power synchronization signal (LP-SS) is received in one or more time slots using a first receiver (eg, the first receiver 505).

[0127] The method 1300 then proceeds to step 1320, where a wake-up signal (WUS) associated with a second receiver (e.g., the second receiver 510) is monitored in a monitoring window using the first receiver based at least in part on the one or more time slots in which the LP-SS is received. The monitoring window can be based at least in part on the one or more time slots because the time at which the monitoring window occurs can be derived from the time of the one or more time slots (e.g., based on an offset between the monitoring window and the time of the one or more time slots).

[0128] In some aspects, the method 1300 further includes activating a second receiver of the UE based at least in part on the WUS.For example, the UE may activate the second receiver in response to the WUS indicating an address associated with the UE.

[0129] In a first aspect, monitoring the WUS further comprises: receiving the WUS in the monitoring window.

[0130] In a second aspect, receiving the LP-SS in the one or more time slots further comprises: receiving two or more repetitions of the LP-SS in two or more time slots, wherein the two or more repetitions are encoded with a cover code indicating that the repetitions are associated with the same transmit beam, wherein the monitoring window is based at least in part on the two or more repetitions being associated with the same transmit beam. The two or more repetitions may be associated with the same transmit beam because the two or more repetitions are configured to be transmitted using the same transmit beam. The monitoring window may be based at least in part on the two or more repetitions being associated with the same transmit beam because the time at which the monitoring window occurs may be derived from the time of the two or more repetitions (such as an offset relative to the time of the two or more repetitions).

[0131] In a third aspect, the cover code indicates the same transmit beam using a cyclic shift applied to the cover code, wherein different transmit beams are associated with different cyclic shifts. Different transmit beams can be associated with different cyclic shifts because the LP-SS of each transmit beam can be encoded with a different cyclic shifted version of the cover code.

[0132] In a fourth aspect, the LP-SS is associated with a multi-beam transmit configuration, and a duration of the monitoring window is increased relative to a default monitoring window based at least in part on the LP-SS being associated with the multi-beam transmit configuration. The LP-SS may be associated with the multi-beam transmit configuration because the LP-SS is configured to transmit using the multi-beam transmit configuration. The duration may be increased relative to the default monitoring window because (e.g., in response to) the LP-SS being associated with the multi-beam transmit opportunity.

[0133] In a fifth aspect, the LP-SS is configured in N time slots according to the multi-beam transmission configuration, and the monitoring window starts at a first number of time slots before the default monitoring window and ends at a second number of time slots after the default monitoring window, wherein the first number of time slots and the second number are based at least in part on N. In some examples, the first number of time slots and the second number of time slots may be derived from N (e.g., may each be equal to N-1).

[0134] In a sixth aspect, the LP-SS is associated with the same resource mapping in each of the N time slots. For example, the LP-SS may be mapped to the same one or more symbols in each of the N time slots.

[0135] In a seventh aspect, the LP-SS and the WUS are associated with (e.g., configured with) a same multi-beam transmission configuration, and the monitoring window has a fixed offset from the one or more time slots based at least in part on the LP-SS and the WUS being associated with the same multi-beam transmission configuration. For example, if the LP-SS and the WUS are associated with the same multi-beam transmission configuration, the monitoring window may be configured using the fixed offset from the one or more time slots.

[0136] In an eighth aspect, the monitoring window has the fixed offset based at least in part on the LP-SS and the WUS having the same repetition configuration and the same multi-beam transmission configuration. For example, in some aspects, the monitoring window can be configured with the fixed offset only if the LP-SS and the WUS have the same repetition configuration and the same multi-beam transmission configuration.

[0137] In a ninth aspect, the fixed offset is independent of a transmit beam index associated with the LP-SS.

[0138] In a tenth aspect, the WUS includes timing information and the method 1300 further includes: adjusting the timing of the second receiver of the UE according to the timing information.

[0139] In an eleventh aspect, the LP-SS is a first LP-SS and is a periodic LP-SS, and adjusting the timing of the second receiver further comprises receiving a second LP-SS after receiving the WUS, wherein the presence of the second LP-SS is indicated by the WUS, and wherein the second LP-SS is aperiodic.

[0140] In one aspect, method 1300 or any aspect related thereto may be performed by an apparatus such as Fig.15 The method 1300 is performed by a communication device 1500 that includes various components operable to, configured to, or adapted to perform the method 1300. The communication device 1500 is described in more detail below.

[0141] Note that method 1300 is only one example of a method and that other methods including fewer, additional, or alternative steps are possible consistent with the present disclosure.

[0142] Example Operations of Network Entities

[0143] Fig.14 A method for transmitting data to a network node such as Figure 1 and Figure 3 BS110 or such Figure 2 Method 1400 for performing wireless communications using a decomposed base station) as discussed above.

[0144] Method 1400 begins at 1410, where a low power synchronization signal (LP-SS) is output in one or more time slots. For example, the network node may transmit the LP-SS in one or more time slots, may provide for transmission of the LP-SS in one or more time slots, or may trigger transmission of the LP-SS in one or more time slots.

[0145] The method 1400 then proceeds to step 1420, where a wake-up signal (WUS) is output in a monitoring window (e.g., a WUS is transmitted, transmission of a WUS is provided, or transmission of a WUS is triggered) based at least in part on the one or more time slots in which the LP-SS is output. The monitoring window can be based at least in part on the one or more time slots because the time at which the monitoring window occurs can be derived from the time of the one or more time slots (e.g., based on an offset between the time of the monitoring window and the one or more time slots).

[0146] In some aspects, the method 1400 also includes: determining an increase from the duration of the first monitoring window to the duration of the second monitoring window based at least in part on a clock drift associated with the UE. For example, the increase can be based on the clock drift, because the increase can be calculated to ensure that the duration of the second monitoring window includes the monitoring window at the UE, taking into account the clock drift.

[0147] In a first aspect, outputting the LP-SS in the one or more time slots further comprises: outputting two or more repetitions of the LP-SS in two or more time slots, wherein the two or more repetitions are encoded with a cover code, the cover code indicating that the two or more repetitions are associated with the same transmit beam (e.g., transmitted using the same transmit beam), wherein the monitoring window is associated with the same transmit beam based at least in part on the two or more repetitions. In some aspects, the cover code indicates that the two or more repetitions are associated with the same transmit beam using a cyclic shift applied to the cover code, wherein different transmit beams are associated with different cyclic shifts.

[0148] In a second aspect, the LP-SS is associated with (e.g., is configured with) a multi-beam transmission configuration, and the duration of the monitoring window is increased relative to a default monitoring window based at least in part on the LP-SS being associated with (e.g., because the LP-SS is configured with) the multi-beam transmission configuration.

[0149] In a third aspect, outputting the LP-SS further comprises: outputting the LP-SS in N time slots according to the multi-beam transmission configuration, and the monitoring window starts at a first number of time slots before the default monitoring window and ends at a second number of time slots after the default monitoring window, wherein the first number of time slots and the second number of time slots are at least partially based on (e.g., derived from) N.

[0150] In a fourth aspect, the one or more time slots include a plurality of time slots, wherein the LP-SS is associated with a multi-beam transmission configuration, and wherein the LP-SS in the plurality of time slots is associated with a same resource mapping in each of the plurality of time slots.

[0151] In a fifth aspect, the LP-SS and the WUS are associated with the same multi-beam transmit configuration (e.g., are configured with the same multi-beam transmit configuration), and the monitoring window has a fixed offset from the one or more time slots based at least in part on the LP-SS and the WUS being associated with the same multi-beam transmit configuration (e.g., because the LP-SS and the WUS are configured with the same multi-beam transmit configuration).

[0152] In a sixth aspect, the monitoring window has the fixed offset based at least in part on the LP-SS and the WUS having the same repetition configuration and the same multi-beam transmission configuration (e.g., because the LP-SS and the WUS are configured with the same multi-beam transmission configuration and the same repetition configuration).

[0153] In a seventh aspect, the fixed offset is independent of a transmit beam index associated with the LP-SS.

[0154] In an eighth aspect, the WUS includes timing information associated with adjusting timing of a second receiver of a user equipment.For example, the timing information may be used by the UE to adjust the timing of the second receiver.

[0155] In a ninth aspect, the timing information indicates a transmit beam index of the LP-SS.

[0156] In a tenth aspect, the timing information includes two or more repeated cover codes of the WUS.

[0157] In an eleventh aspect, the LP-SS is a first LP-SS and is a periodic LP-SS, and wherein the timing information indicates a presence of a second LP-SS transmission after the WUS, wherein adjusting the timing of the second receiver of the UE is based at least in part on receiving the second LP-SS.

[0158] In a twelfth aspect, the monitoring window is a periodic monitoring window, wherein a duration of a first monitoring window of the periodic monitoring window is shorter in time than a duration of a second monitoring window of the periodic monitoring window.

[0159] In one aspect, method 1400 or any aspect related thereto may be performed by an apparatus such as Fig.16 The method 1400 is performed by a communication device 1600 that includes various components that are operable, configured, or adapted to perform the method 1400. The communication device 1600 is described in more detail below.

[0160] Note that diagram 1400 is only one example of a method and that other methods including fewer, additional, or alternative steps are possible consistent with the present disclosure.

[0161] Example Communication Device

[0162] Fig.15 Depicted are aspects of an example communications device 1500. In some aspects, communications device 1500 is user equipment, such as described above with respect to Figure 1 and Figure 3 UE 120 is described.

[0163] The communication device 1500 includes a processing system 1502 coupled to a transceiver 1508 (e.g., a transmitter and / or a receiver). The transceiver 1508 is configured to transmit and receive signals for the communication device 1500, such as various signals as described herein, via an antenna 1510. The processing system 1502 may be configured to perform processing functions for the communication device 1500, including processing signals received by and / or to be transmitted by the communication device 1500.

[0164] The processing system 1502 includes one or more processors 1520. In various aspects, the one or more processors 1520 may represent one or more of the receive processor 358, the transmit processor 364, the TX MIMO processor 366, and / or the controller / processor 380, as described with respect to FIG. Figure 3 The one or more processors 1520 are coupled to the computer readable medium / memory 1530 via the bus 1506. In some aspects, the computer readable medium / memory 1530 is configured to store instructions (e.g., computer executable code) that, when executed by the one or more processors 1520, cause the one or more processors 1520 to perform operations related to the computer readable medium / memory 1530. Fig.13 The method 1300 described herein or any aspect related thereto. Note that reference to a processor performing a function of the communication device 1500 may include one or more processors performing that function of the communication device 1500.

[0165] In the depicted example, the computer-readable medium / memory 1530 stores code (e.g., executable instructions) 1531 for using a first receiver to receive LP-SS in one or more time slots, code 1532 for using the first receiver to monitor a WUS associated with a second receiver in a monitoring window based at least in part on the one or more time slots in which the LP-SS is received, code 1533 for activating the second receiver of the UE based at least in part on the WUS, and code 1534 for adjusting the timing of the second receiver of the UE based on the timing information. The processing of codes 1531-1534 may cause the communication device 1500 to perform operations related to Fig.13 The method 1300 described herein or any aspect related thereto.

[0166] The one or more processors 1520 include: circuits configured to implement (e.g., execute) code stored in a computer-readable medium / memory 1530, including circuits 1521 for using a first receiver to receive LP-SS in one or more time slots, circuits 1522 for using the first receiver to monitor a WUS associated with a second receiver in a monitoring window based at least in part on the one or more time slots in which the LP-SS is received, circuits 1523 for activating a second receiver of the UE based at least in part on the WUS, and circuits 1524 for adjusting the timing of the second receiver of the UE based on the timing information. Processing using circuits 1521-1524 may enable the communication device 1500 to perform operations related to Fig.13 The method 1300 described herein or any aspect related thereto.

[0167] The various components of the communication device 1500 may provide for performing Fig.13The components of the method 1300 described herein or any aspect thereof. For example, the components for sending, transmitting, or outputting for sending may include Figure 3 The illustrated transceiver 354 and / or antenna 352 of the UE 120, and / or Fig.15 The transceiver 1508 and antenna 1510 of the communication device 1500 in FIG. 1 may include Figure 3 The illustrated transceiver 354 and / or antenna 352 of the UE 120, and / or Fig.15 The transceiver 1508 and antenna 1510 of the communication device 1500 in FIG.

[0168] Fig.16 Depicted are aspects of an example communication device. In some aspects, the communication device 1600 is a network entity such as Figure 1 and Figure 3 BS110 or such Figure 2 The decomposed base station in question.

[0169] The communication device 1600 includes a processing system 1602 coupled to a transceiver 1608 (e.g., a transmitter and / or a receiver) and / or a network interface 1612. The transceiver 1608 is configured to transmit and receive signals for the communication device 1600 via an antenna 1610, such as the various signals described herein. The network interface 1612 is configured to transmit and receive signals for the communication device 1600 via a communication link (such as, for example, as described herein with respect to Figure 2 The processing system 1602 may be configured to obtain and transmit signals for the communication device 1600 using the backhaul link, midhaul link, and / or fronthaul link described herein. The processing system 1602 may be configured to perform processing functions of the communication device 1600, including processing signals received by the communication device 1600 and / or to be transmitted by it.

[0170] The processing system 1602 includes one or more processors 1620. In various aspects, the one or more processors 1620 may represent one or more of the receive processor 338, the transmit processor 320, the TX MIMO processor 330, and / or the controller / processor 340, as described with respect to FIG. Figure 3 The one or more processors 1620 are coupled to the computer readable medium / memory 1630 via the bus 1606. In some aspects, the computer readable medium / memory 1630 is configured to store instructions (e.g., computer executable code) that, when executed by the one or more processors 1620, cause the one or more processors 1620 to perform operations related to the computer readable medium / memory 1630. Fig.14 The method 1400 described herein or any aspect related thereto. Note that reference to a processor of the communication device 1600 performing a function may include one or more processors of the communication device 1600 performing the function.

[0171] In the depicted example, the computer-readable medium / memory 1630 stores code (e.g., executable instructions) 1631 for outputting LP-SS in one or more time slots, code 1632 for outputting WUS in a monitoring window based at least in part on the one or more time slots in which the LP-SS is output, and code 1633 for determining an increase from a duration of a first monitoring window to a duration of a second monitoring window based at least in part on a clock drift associated with a user equipment. The processing of codes 1631-1633 may cause the communication device 1600 to perform operations related to Fig.14 The described method 1400 or any aspect related thereto.

[0172] The one or more processors 1620 include: circuits configured to implement (e.g., execute) code stored in the computer-readable medium / memory 1630, including circuits 1621 for outputting LP-SS in one or more time slots, circuits 1622 for outputting WUS in a monitoring window based at least in part on the one or more time slots in which the LP-SS is output, and circuits 1623 for determining an increase from the duration of the first monitoring window to the duration of the second monitoring window based at least in part on a clock drift associated with the user equipment. Processing using the circuits 1621-1623 may cause the communication device 1600 to perform as described with respect to Fig.14 The described method 1400 or any aspect related thereto.

[0173] The various components of the communication device 1600 may provide for performing Fig.14 The components of the method 1400 described herein or any aspect thereof. The components for sending, transmitting, or outputting for sending may include Figure 3 The illustrated transceiver 332 and / or antenna 334 of the BS 110, and / or Fig.16 The transceiver 1608 and antenna 1610 of the communication device 1600 in FIG. 1 may include Figure 3 The illustrated transceiver 332 and / or antenna 334 of the BS 110, and / or Fig.16 The transceiver 1608 and antenna 1610 of the communication device 1600 in FIG.

[0174] Sample Clauses

[0175] Specific implementation examples are described in the following numbered clauses:

[0176] Clause 1: A method of wireless communication performed by a user equipment (UE), the method comprising: using a first receiver to receive a low power synchronization signal (LP-SS) in one or more time slots; and using the first receiver to monitor a wake-up signal (WUS) associated with a second receiver in a monitoring window based at least in part on the one or more time slots in which the LP-SS is received.

[0177] Clause 2: The method of clause 1, wherein monitoring the WUS further comprises: receiving the WUS within the monitoring window.

[0178] Clause 3: A method according to any one of clauses 1-2, wherein receiving the LP-SS in the one or more time slots further comprises: receiving two or more repetitions of the LP-SS in two or more time slots, wherein the two or more repetitions are encoded with a cover code, the cover code indicating that the two or more repetitions are associated with the same transmit beam, and wherein the monitoring window is at least partially based on the two or more repetitions being associated with the same transmit beam.

[0179] Clause 4: The method of clause 3, wherein the cover code indicates the same transmit beam using a cyclic shift applied to the cover code, wherein different transmit beams are associated with different cyclic shifts.

[0180] Clause 5: A method according to any of clauses 1-4, wherein the LP-SS is associated with a multi-beam transmission configuration, and wherein the duration of the monitoring window is increased relative to a default monitoring window based at least in part on the LP-SS being associated with the multi-beam transmission configuration.

[0181] Clause 6: A method according to clause 5, wherein the LP-SS is configured in N time slots according to the multi-beam transmission configuration, and wherein the monitoring window starts at a first number of time slots before the default monitoring window and ends at a second number of time slots after the default monitoring window, wherein the first number of time slots and the second number of time slots are at least partially based on N.

[0182] Clause 7: The method of clause 5, wherein the LP-SS is associated with the same resource mapping in each of the N time slots.

[0183] Clause 8: A method according to any one of clauses 1-7, wherein the LP-SS and the WUS are associated with the same multi-beam transmission configuration, and wherein the monitoring window has a fixed offset from the one or more time slots based at least in part on the LP-SS and the WUS being associated with the same multi-beam transmission configuration.

[0184] Clause 9: The method of clause 8, wherein the monitoring window has the fixed offset based at least in part on the LP-SS and the WUS having the same repetition configuration and the same multi-beam transmission configuration.

[0185] Clause 10: The method of clause 8, wherein the fixed offset is independent of a transmit beam index associated with the LP-SS.

[0186] Clause 11: A method as described in any of clauses 1-10, the method further comprising: activating the second receiver of the UE based at least in part on the WUS.

[0187] Clause 12: A method as set out in any of clauses 1-11, wherein the WUS comprises timing information and the method further comprises: adjusting the timing of the second receiver of the UE according to the timing information.

[0188] Clause 13: The method of clause 12, wherein the LP-SS is a first LP-SS and is a periodic LP-SS, and wherein adjusting the timing of the second receiver further comprises receiving a second LP-SS after receiving the WUS, wherein the presence of the second LP-SS is indicated by the WUS, and wherein the second LP-SS is aperiodic.

[0189] Clause 14: A method of wireless communication performed by a network node, the method comprising: outputting a low power synchronization signal (LP-SS) in one or more time slots; and outputting a wake-up signal (WUS) in a monitoring window based at least in part on the one or more time slots in which the LP-SS is output.

[0190] Clause 15: A method according to clause 14, wherein outputting the LP-SS in the one or more time slots further comprises: outputting two or more repetitions of the LP-SS in two or more time slots, wherein the two or more repetitions are encoded with a cover code, the cover code indicating that the two or more repetitions are associated with the same transmit beam, wherein the monitoring window is at least partially based on the two or more repetitions being associated with the same transmit beam.

[0191] Clause 16: The method of clause 15, wherein the cover code indicates that the two or more repetitions are associated with the same transmit beam using a cyclic shift applied to the cover code, wherein different transmit beams are associated with different cyclic shifts.

[0192] Clause 17: A method according to any of clauses 14-16, wherein the one or more time slots include a plurality of time slots, wherein the LP-SS is associated with a multi-beam transmission configuration, and wherein the LP-SS in the plurality of time slots is associated with the same resource mapping in each of the plurality of time slots.

[0193] Clause 18: A method according to any of clauses 14-17, wherein the LP-SS and the WUS are associated with the same multi-beam transmission configuration, and wherein the monitoring window has a fixed offset from the one or more time slots based at least in part on the LP-SS and the WUS being associated with the same multi-beam transmission configuration.

[0194] Clause 19: The method of clause 18, wherein the monitoring window has the fixed offset based at least in part on the LP-SS and the WUS having the same repetition configuration and the same multi-beam transmission configuration.

[0195] Clause 20: The method of clause 18, wherein the fixed offset is independent of a transmit beam index associated with the LP-SS.

[0196] Clause 21: A method as recited in any of clauses 14-20, wherein the WUS comprises timing information associated with adjusting timing of a second receiver of user equipment.

[0197] Clause 22: The method of clause 21, wherein the timing information indicates a transmit beam index of the LP-SS.

[0198] Clause 23: The method of clause 21, wherein the timing information comprises two or more repeated cover codes of the WUS.

[0199] Clause 24: A method as described in clause 21, wherein the LP-SS is a first LP-SS and is a periodic LP-SS, and wherein the timing information indicates the presence of a second LP-SS transmission after the WUS, wherein adjusting the timing of the second receiver of the UE is based at least in part on receiving the second LP-SS.

[0200] Clause 25: A method according to any of clauses 14-24, wherein the monitoring windows are periodic monitoring windows, wherein the duration of a first monitoring window of the periodic monitoring windows is shorter in time than the duration of a second monitoring window of the periodic monitoring windows.

[0201] Clause 26: The method of clause 25, further comprising determining an increase from the duration of the first monitoring window to the duration of the second monitoring window based at least in part on a clock drift associated with a user equipment (UE).

[0202] Clause 27: An apparatus configured for wireless communication, the apparatus comprising: a memory including computer-executable instructions; and a processor configured to execute the processor-executable instructions and cause the apparatus to perform the method of any of clauses 1-26.

[0203] Clause 28: An apparatus comprising: means for performing the method according to any of clauses 1-26.

[0204] Clause 29: A non-transitory computer-readable medium comprising: executable instructions that, when executed by a processor of an apparatus, cause the apparatus to perform the method of any of clauses 1-26.

[0205] Clause 30: A computer program product embodied on a computer readable storage medium, the computer readable storage medium comprising code for performing the method according to any of clauses 1-26.

[0206] Additional considerations

[0207] The foregoing description is provided to enable any person skilled in the art to practice the various aspects described herein. The examples discussed herein are not limited to the scope, applicability or aspects set forth in the claims. Various modifications to these aspects will be apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects. For example, without departing from the scope of the present disclosure, the functions and arrangements of the elements discussed may be changed. Various examples may omit, replace or add various procedures or components as appropriate. For example, the described methods may be performed in a different order from the described order, and various actions may be added, omitted or combined. In addition, the features described with respect to some examples may be combined in some other examples. For example, any number of aspects set forth herein may be used to implement a device or practice method. In addition, the scope of the present disclosure is intended to cover such devices or methods practiced using other structures, functionality or structures and functionality other than the various aspects of the present disclosure set forth herein or different from the various aspects of the present disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of the claims.

[0208] The various illustrative logical blocks, modules, and circuits described in conjunction with the present disclosure may be implemented or executed with a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device (PLD), discrete gate or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described herein. Although a general purpose processor may be a microprocessor, in an alternative, the processor may be any commercially available 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, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, a system on a chip (SoC), or any other such configuration).

[0209] As used herein, a phrase referring to "at least one of" a list of items refers to any combination of those items (including single members). As an example, "at least one of a, b, or c" is intended to cover a, b, c, ab, ac, bc, and abc, as well as any combination with multiples of the same element (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other ordering of a, b, and c).

[0210] As used herein, the term "determine" encompasses a wide variety of actions. For example, "determine" may include calculating, computing, processing, deriving, investigating, searching (e.g., searching in a table, a database, or another data structure), ascertaining, etc. In addition, "determine" may include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory), etc. In addition, "determine" may include resolving, selecting, choosing, establishing, etc.

[0211] The methods disclosed herein include one or more actions for implementing the methods. Method actions may be interchangeable with each other without departing from the scope of the claims. In other words, unless a specified order of actions is specified, the order and / or use of specific actions may be modified without departing from the scope of the claims. In addition, the various operations of the above methods may be performed by any suitable component capable of performing the corresponding functions. Components may include various hardware and / or software components and / or modules, including but not limited to circuits, ASICs, or processors.

[0212] The following claims are not intended to be limited to the various aspects shown herein, but should be given the full scope consistent with the language of the claims. Within the claims, unless explicitly stated, reference to an element in the singular form is not intended to mean "one and only one", but "one or more". Unless otherwise specified, the term "some" refers to one or more. Any claim element is not interpreted according to the provisions of 35 U.S.C. § 112 (f) unless the element is explicitly stated using the phrase "parts for...". All structural and functional equivalents of the elements of the various aspects described throughout this disclosure that are known or will be known later to a person of ordinary skill in the art are expressly incorporated herein by reference and are intended to be covered by the claims. In addition, nothing disclosed herein is intended to be dedicated to the public, regardless of whether such disclosure is explicitly stated in the claims.

Claims

1. A method of wireless communication performed by a user equipment (UE), the method comprising: using a first receiver to receive a low power synchronization signal (LP-SS) in one or more time slots; as well as Monitoring a wake-up signal (WUS) associated with a second receiver in a monitoring window using the first receiver based at least in part on the one or more time slots in which the LP-SS is received. 2 . The method of claim 1 , wherein monitoring the WUS further comprises receiving the WUS within the monitoring window.

3. The method of claim 1 , wherein receiving the LP-SS in the one or more time slots further comprises: Two or more repetitions of the LP-SS are received in two or more time slots, wherein the two or more repetitions are encoded with a cover code, the cover code indicating that the two or more repetitions are associated with the same transmit beam, wherein the monitoring window is associated with the same transmit beam based at least in part on the two or more repetitions.

4. The method of claim 3, wherein the cover code indicates the same transmit beam using a cyclic shift applied to the cover code, wherein different transmit beams are associated with different cyclic shifts.

5. The method of claim 1 , wherein the LP-SS is associated with a multi-beam transmission configuration, and wherein the duration of the monitoring window is increased relative to a default monitoring window based at least in part on the LP-SS being associated with the multi-beam transmission configuration.

6. The method of claim 5, wherein the LP-SS is configured in N time slots according to the multi-beam transmission configuration, and wherein the monitoring window starts at a first number of time slots before the default monitoring window and ends at a second number of time slots after the default monitoring window, wherein the first number of time slots and the second number of time slots are based at least in part on N.

7. The method of claim 6, wherein the LP-SS is associated with the same resource mapping in each of the N time slots.

8. The method of claim 1 , wherein the LP-SS and the WUS are associated with a same multi-beam transmission configuration, and wherein the monitoring window has a fixed offset from the one or more time slots based at least in part on the LP-SS and the WUS being associated with the same multi-beam transmission configuration. 9 . The method of claim 8 , wherein the monitoring window has the fixed offset based at least in part on the LP-SS and the WUS having the same repetition configuration and the same multi-beam transmission configuration.

10. The method of claim 8, wherein the fixed offset is independent of a transmit beam index associated with the LP-SS.

11. The method according to claim 1, further comprising: The second receiver of the UE is activated based at least in part on the WUS.

12. The method of claim 1, wherein the WUS includes timing information and the method further comprises: The timing of the second receiver of the UE is adjusted according to the timing information.

13. The method of claim 12, wherein the LP-SS is a first LP-SS and is a periodic LP-SS, and wherein adjusting the timing of the second receiver further comprises receiving a second LP-SS after receiving the WUS, wherein the presence of the second LP-SS is indicated by the WUS, and wherein the second LP-SS is aperiodic.

14. A method of wireless communication performed by a network node, the method comprising: Outputting a low power synchronization signal (LP-SS) in one or more time slots; as well as A wake-up signal (WUS) is output in a monitoring window based at least in part on the one or more time slots in which the LP-SS is output.

15. The method of claim 14, wherein outputting the LP-SS in the one or more time slots further comprises: Two or more repetitions of the LP-SS are output in two or more time slots, wherein the two or more repetitions are encoded with a cover code, the cover code indicating that the two or more repetitions are associated with the same transmit beam, wherein the monitoring window is associated with the same transmit beam based at least in part on the two or more repetitions.

16. The method of claim 15, wherein the cover code indicates that the two or more repetitions are associated with the same transmit beam using a cyclic shift applied to the cover code, wherein different transmit beams are associated with different cyclic shifts.

17. The method of claim 14, wherein the one or more time slots comprises a plurality of time slots, wherein the LP-SS is associated with a multi-beam transmission configuration, and wherein the LP-SS in the plurality of time slots is associated with a same resource mapping in each of the plurality of time slots.

18. The method of claim 14, wherein the LP-SS and the WUS are associated with a same multi-beam transmission configuration, and wherein the monitoring window has a fixed offset from the one or more time slots based at least in part on the LP-SS and the WUS being associated with the same multi-beam transmission configuration.

19. The method of claim 18, wherein the monitoring window has the fixed offset based at least in part on the LP-SS and the WUS having the same repetition configuration and the same multi-beam transmission configuration.

20. The method of claim 18, wherein the fixed offset is independent of a transmit beam index associated with the LP-SS.

21. The method of claim 14, wherein the WUS includes timing information associated with adjusting timing of a second receiver of user equipment.

22. The method according to claim 21, wherein the timing information indicates a transmit beam index of the LP-SS.

23. The method of claim 21, wherein the timing information comprises two or more repeated cover codes of the WUS.

24. The method of claim 21, wherein the LP-SS is a first LP-SS and is a periodic LP-SS, and wherein the timing information indicates the presence of a second LP-SS transmission after the WUS.

25. The method of claim 14, wherein the monitoring window is a periodic monitoring window, wherein a duration of a first monitoring window of the periodic monitoring window is shorter in time than a duration of a second monitoring window of the periodic monitoring window.

26. The method according to claim 25, further comprising: An increase from the duration of the first monitoring window to the duration of the second monitoring window is determined based at least in part on a clock drift associated with a user equipment (UE).

27. A user equipment (UE) configured for wireless communication, the user equipment (UE) comprising: a memory including processor-executable instructions; and a processor configured to execute the processor-executable instructions and cause the UE to: Using a first receiver to receive a low power synchronization signal (LP-SS) in one or more time slots; and Monitoring a wake-up signal (WUS) associated with a second receiver in a monitoring window using the first receiver based at least in part on the one or more time slots in which the LP-SS is received.

28. A network node configured for wireless communication, the network node comprising: a memory including processor-executable instructions; and a processor configured to execute the processor-executable instructions and cause the network node to: outputting a low power synchronization signal (LP-SS) in one or more time slots; and A wake-up signal (WUS) is output in a monitoring window based at least in part on the one or more time slots in which the LP-SS is output.

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