Systems and methods for supporting low power wake-up signals
By configuring low-power wake-up signals within wireless communication devices, the system addresses the challenge of power consumption during inactive C-DRX periods, achieving improved energy efficiency and latency management.
Patent Information
- Application Number
- PCT/CN2024/107138
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-07-24
- Publication Date
- 2025-06-19
AI Technical Summary
Current wireless communication technologies face challenges in efficiently managing power consumption for user equipment (UE) during inactive periods in connected state Discontinuous Reception (C-DRX) cycles, which affects battery life and latency.
The implementation of low-power wake-up signals (LP-WUS) with configurable parameters such as LP_WUS-periodicity, LPWUS-StartOffset, referenceSFN, and referenceSubFrame, allows wireless communication devices to monitor LP-WUS signals during inactive C-DRX periods, reducing unnecessary power consumption.
This solution enhances UE energy efficiency, improves network adaptability to energy consumption requirements, and balances battery life and latency by allowing devices to monitor LP-WUS signals with reduced power usage during inactive periods.
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Figure CN2024107138_19062025_PF_FP_ABST
Abstract
Description
SYSTEMS AND METHODS FOR SUPPORTING LOW POWER WAKE-UP SIGNALSTECHNICAL FIELD
[0001] The disclosure relates generally to wireless communications, including but not limited to systems and methods for supporting low power wake-up signals.BACKGROUND
[0002] UE power consumption is a key consideration in cellular network deployments. With the rise of interconnected devices, there is a growing focus on effective device communication. The current 3GPP standards, spanning from 3G to 5G and beyond, focus on the importance of seamless communication among various devices, from smart home devices to wearable devices. In industrial settings, the complexity of tasks often requires collaboration. This calls for several cooperative operational management systems, with the aim of creating workgroups and managing different types of devices to complete the required tasks.SUMMARY
[0003] The example embodiments disclosed herein are directed to solving the issues relating to one or multiple of the problems presented in the prior art, as well as providing additional features that will become readily apparent by reference to the following detailed description when taken in conjunction with the accompany drawings. In accordance with various embodiments, example systems, methods, devices and computer program products are disclosed herein. It is understood, however, that these embodiments are presented by way of example and are not limiting, and it will be apparent to those of ordinary skill in the art who read the present disclosure that various modifications to the disclosed embodiments can be made while remaining within the scope of this disclosure.
[0004] At least one aspect is directed to a system, method, apparatus, or a computer-readable medium. A wireless communication device can receive / obtain / acquire configurations of one or more low-power wake-up signal (LP-WUS) parameters from a wireless communication node. The wireless communication device can monitor, based on the configurations of the one or more LP-WUS parameters, a plurality of LP-WUS signals during an inactive period of a connected state DRX (C-DRX) cycle. In certain implementations, the LP-WUS parameters may include at least one of the following: LP_WUS-periodicity, LPWUS-StartOffset, referenceSFN, or referenceSubFrame, and wherein the LP_WUS-periodicity represents a periodicity of the plurality of LP-WUS signals that a UE need to monitor, the LPWUS-StartOffset represents a time offset to determine monitoring occasions of the plurality of LP-WUS signals, the referenceSFN represents an SFN used to determine the start occasion of a drx-OnDurationTimer, and the referenceSubFrame represents a SubFrame used to determine the start occasion of the drx-OnDurationTimer
[0005] In certain implementations, the wireless communication device can monitor the plurality of LP-WUS signals at subframes determined based on the LP_WUS-periodicity and LPWUS-StartOffset. In certain implementations, the wireless communication device can monitor the plurality of LP-WUS signals at subframes determined based on the LP_WUS-periodicity, referenceSFN, and referenceSubFrame. In certain implementations, the wireless communication device can monitor the plurality of LP-WUS signals before subframes are determined based on the LP_WUS-periodicity and LPWUS-StartOffset. The LP_WUS-periodicity can be configured as a non-integer number. In certain implementations, the wireless communication device can monitor the plurality of LP-WUS signals before subframes are determined based on the LP_WUS-periodicity and LPWUS-StartOffset. The LP_WUS-periodicity can be configured as an integer number. In certain implementations, the wireless communication device can monitor the plurality of LP-WUS signals at subframes determined based on the LP_WUS-periodicity and UE_ID. In certain implementations, in response to detecting one of the LP-WUS signals at a corresponding subframe, the drx-OnDurationTimer can start monitoring a PDCCH from the subframe plus a time offset.
[0006] In certain implementations, a wireless communication node can send / transmit / provide configurations of one or more low-power wake-up signal (LP-WUS) parameters to a wireless communication device. During an inactive period of a connected state DRX (C-DRX) cycle, the wireless communication device can be configured to monitor, based on the configurations of the one or more LP-WUS parameters, a plurality of LP-WUS signals. In certain implementations, a wireless communication device can receive / obtain / acquire configurations of one or more low-power wake-up signal (LP-WUS) parameters in system information from a wireless communication node. The wireless communication device can monitor, based on the configurations of the one or more LP-WUS parameters, a plurality of LP-WUS signals, when configured in a non-RRC_CONNECTED state.
[0007] In certain implementations, upon identifying that a paging early indication (PEI) monitoring condition is met, the wireless communication device can monitor the LP-WUS signals before a PEI corresponding to the PEI monitoring condition with a time offset. In certain implementations, upon identifying that a paging early indication (PEI) monitoring condition is not met, the wireless communication device can monitor the LP-WUS signals before a paging occasion with a time offset. In certain implementations, upon identifying that a core network-assigned LP-WUS subgrouping is provided, the wireless communication device can monitor the LP-WUS subgroup assigned by the core network. In certain implementations, upon identifying that no core network-assigned LP-WUS subgrouping is provided, the wireless communication device can monitor LP-WUS subgroup decided based on UE identity.
[0008] In certain implementations, the subgroup IDs can be determined based on at least one of the following: a number of total paging frames in a paging cycle, a number of paging occasions for a PF, UE_ID, UE_ID_H, subgroupsNumForUEIDofPEI, subgroupsNumForUEIDofLPWUS, or subgroupsStartNoForUEIDofLPWUS, and wherein the UE_ID represents at least one of the UE identity or partial bits of the UE identity, the UE_ID_H represents at least one of a hashed UE identity or partial bits of the hashed UE identity, the subgroupsNumForUEIDofPEI represents a number of PEI subgroups for UE_ID based subgrouping in a PO, the subgroupsNumForUEIDofLPWUS represents a number of LP_WUS subgroups for UE_ID based subgrouping in a PO, the subgroupsStartNoForUEIDofLPWUS represents a starting number of LP_WUS subgroups for UE_ID based subgrouping in a PO.
[0009] In certain implementations, a wireless communication node can send / transmit / provide configurations of one or more low-power wake-up signal (LP-WUS) parameters in system information to a wireless communication device. When configured in a non-RRC_CONNECTED state, the wireless communication device can be configured to monitor, based on the configurations of the one or more LP-WUS parameters, a plurality of LP-WUS signals. The non-RRC_CONNECTED state means that the UE is not in the RRC_CONNECTED state, which may include at least one of the the following: RRC_IDLE state, RRC_INACTIVE state, etc.
[0010] The system of the technical solutions disclosed herein can support energy efficient configurations in wireless networks, particularly enhancing UE energy efficiency. The system of the technical solutions can improve network adaptability to energy consumption requirements while managing the trade-off between battery life and latency, according to at least one of the following example configurations (e.g., features or solutions) :
[0011] · Example configuration 1: Configuring and / or Determining LP-WUS Monitoring Occasions for UE in RRC_CONNECTED State.
[0012] · Example configuration 2: Activating and / or Deactivating LP-WUS for UE in RRC_CONNECTED State.
[0013] · Example configuration 3: Performing main radio Relaxed Measurements and / or Offloading.
[0014] · Example configuration 4: LP-WUS occasion determination for UE in non-RRC_CONNECTED State.BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Various example embodiments of the present solution are described in detail below with reference to the following figures or drawings. The drawings are provided for purposes of illustration only and merely depict example embodiments of the present solution to facilitate the reader’s understanding of the present solution. Therefore, the drawings should not be considered limiting of the breadth, scope, or applicability of the present solution. It should be noted that for clarity and ease of illustration, these drawings are not necessarily drawn to scale.
[0016] FIG. 1 illustrates an example cellular communication network in which techniques disclosed herein may be implemented, in accordance with an embodiment of the present disclosure;
[0017] FIG. 2 illustrates a block diagram of an example base station and a user equipment device, in accordance with some embodiments of the present disclosure;
[0018] FIG. 3 illustrates an example C-DRX cycle flow chart, in accordance with some embodiments of the present disclosure;
[0019] FIG. 4 illustrates another example C-DRX cycle flow chart, in accordance with some embodiments of the present disclosure;
[0020] FIG. 5 illustrates an example configuration for reporting an LP-WUS support capability, in accordance with some embodiments of the present disclosure;
[0021] FIG. 6 illustrates an example configuration for indicating LP-WUS activation or deactivation, in accordance with some embodiments of the present disclosure;
[0022] FIG. 7 illustrates an example configuration for reporting an LP-WUS condition, in accordance with some embodiments of the present disclosure; and
[0023] FIG. 8 illustrates a flow diagram of an example method for supporting low power wake-up signals, in accordance with an embodiment of the present disclosure.DETAILED DESCRIPTION
[0024] 1. Mobile Communication Technology and Environment
[0025] FIG. 1 illustrates an example wireless communication network, and / or system, 100 in which techniques disclosed herein may be implemented, in accordance with an embodiment of the present disclosure. In the following discussion, the wireless communication network 100 may be any wireless network, such as a cellular network or a narrowband Internet of things (NB-IoT) network, and is herein referred to as “network 100. ” Such an example network 100 includes a base station 102 (hereinafter “BS 102” ; also referred to as wireless communication node) and a user equipment device 104 (hereinafter “UE 104” ; also referred to as wireless communication device) that can communicate with each other via a communication link 110 (e.g., a wireless communication channel) , and a cluster of cells 126, 130, 132, 134, 136, 138 and 140 overlaying a geographical area 101. In Figure 1, the BS 102 and UE 104 are contained within a respective geographic boundary of cell 126. Each of the other cells 130, 132, 134, 136, 138 and 140 may include at least one base station operating at its allocated bandwidth to provide adequate radio coverage to its intended users.
[0026] For example, the BS 102 may operate at an allocated channel transmission bandwidth to provide adequate coverage to the UE 104. The BS 102 and the UE 104 may communicate via a downlink radio frame 118, and an uplink radio frame 124 respectively. Each radio frame 118 / 124 may be further divided into sub-frames 120 / 127 which may include data symbols 122 / 128. In the present disclosure, the BS 102 and UE 104 are described herein as non-limiting examples of “communication nodes, ” generally, which can practice the methods disclosed herein. Such communication nodes may be capable of wireless and / or wired communications, in accordance with various embodiments of the present solution.
[0027] FIG. 2 illustrates a block diagram of an example wireless communication system 200 for transmitting and receiving wireless communication signals (e.g., OFDM / OFDMA signals) in accordance with some embodiments of the present solution. The system 200 may include components and elements configured to support known or conventional operating features that need not be described in detail herein. In one illustrative embodiment, system 200 can be used to communicate (e.g., transmit and receive) data symbols in a wireless communication environment such as the wireless communication environment 100 of Figure 1, as described above.
[0028] System 200 generally includes a base station 202 (hereinafter “BS 202” ) and a user equipment device 204 (hereinafter “UE 204” ) . The BS 202 includes a BS (base station) transceiver module 210, a BS antenna 212, a BS processor module 214, a BS memory module 216, and a network communication module 218, each module being coupled and interconnected with one another as necessary via a data communication bus 220. The UE 204 includes a UE (user equipment) transceiver module 230, a UE antenna 232, a UE memory module 234, and a UE processor module 236, each module being coupled and interconnected with one another as necessary via a data communication bus 240. The BS 202 communicates with the UE 204 via a communication channel 250, which can be any wireless channel or other medium suitable for transmission of data as described herein.
[0029] As would be understood by persons of ordinary skill in the art, system 200 may further include any number of modules other than the modules shown in Figure 2. Those skilled in the art will understand that the various illustrative blocks, modules, circuits, and processing logic described in connection with the embodiments disclosed herein may be implemented in hardware, computer-readable software, firmware, or any practical combination thereof. To clearly illustrate this interchangeability and compatibility of hardware, firmware, and software, various illustrative components, blocks, modules, circuits, and steps are described generally in terms of their functionality. Whether such functionality is implemented as hardware, firmware, or software can depend upon the particular application and design constraints imposed on the overall system. Those familiar with the concepts described herein may implement such functionality in a suitable manner for each particular application, but such implementation decisions should not be interpreted as limiting the scope of the present disclosure.
[0030] In accordance with some embodiments, the UE transceiver 230 may be referred to herein as an “uplink” transceiver 230 that includes a radio frequency (RF) transmitter and a RF receiver each comprising circuitry that is coupled to the antenna 232. A duplex switch (not shown) may alternatively couple the uplink transmitter or receiver to the uplink antenna in time duplex fashion. Similarly, in accordance with some embodiments, the BS transceiver 210 may be referred to herein as a “downlink” transceiver 210 that includes a RF transmitter and a RF receiver each comprising circuity that is coupled to the antenna 212. A downlink duplex switch may alternatively couple the downlink transmitter or receiver to the downlink antenna 212 in time duplex fashion. The operations of the two transceiver modules 210 and 230 may be coordinated in time such that the uplink receiver circuitry is coupled to the uplink antenna 232 for reception of transmissions over the wireless transmission link 250 at the same time that the downlink transmitter is coupled to the downlink antenna 212. Conversely, the operations of the two transceivers 210 and 230 may be coordinated in time such that the downlink receiver is coupled to the downlink antenna 212 for reception of transmissions over the wireless transmission link 250 at the same time that the uplink transmitter is coupled to the uplink antenna 232. In some embodiments, there is close time synchronization with a minimal guard time between changes in duplex direction.
[0031] The UE transceiver 230 and the base station transceiver 210 are configured to communicate via the wireless data communication link 250, and cooperate with a suitably configured RF antenna arrangement 212 / 232 that can support a particular wireless communication protocol and modulation scheme. In some illustrative embodiments, the UE transceiver 210 and the base station transceiver 210 are configured to support industry standards such as the Long Term Evolution (LTE) and emerging 5G standards, and the like. It is understood, however, that the present disclosure is not necessarily limited in application to a particular standard and associated protocols. Rather, the UE transceiver 230 and the base station transceiver 210 may be configured to support alternate, or additional, wireless data communication protocols, including future standards or variations thereof.
[0032] In accordance with various embodiments, the BS 202 may be an evolved node B (eNB) , a serving eNB, a target eNB, a femto station, or a pico station, for example. In some embodiments, the UE 204 may be embodied in various types of user devices such as a mobile phone, a smart phone, a personal digital assistant (PDA) , tablet, laptop computer, wearable computing device, etc. The processor modules 214 and 236 may be implemented, or realized, with a general purpose processor, a content addressable memory, a digital signal processor, an application specific integrated circuit, a field programmable gate array, any suitable programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described herein. In this manner, a processor may be realized as a microprocessor, a controller, a microcontroller, a state machine, or the like. A processor may also be implemented as a combination of computing devices, e.g., a combination of a digital signal processor and a microprocessor, a plurality of microprocessors, one or multiple microprocessors in conjunction with a digital signal processor core, or any other such configuration.
[0033] Furthermore, the steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in firmware, in a software module executed by processor modules 214 and 236, respectively, or in any practical combination thereof. The memory modules 216 and 234 may be realized as RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. In this regard, memory modules 216 and 234 may be coupled to the processor modules 210 and 230, respectively, such that the processors modules 210 and 230 can read information from, and write information to, memory modules 216 and 234, respectively. The memory modules 216 and 234 may also be integrated into their respective processor modules 210 and 230. In some embodiments, the memory modules 216 and 234 may each include a cache memory for storing temporary variables or other intermediate information during execution of instructions to be executed by processor modules 210 and 230, respectively. Memory modules 216 and 234 may also each include non-volatile memory for storing instructions to be executed by the processor modules 210 and 230, respectively.
[0034] The network communication module 218 generally represents the hardware, software, firmware, processing logic, and / or other components of the base station 202 that enable bi-directional communication between base station transceiver 210 and other network components and communication nodes configured to communicate with the base station 202. For example, network communication module 218 may be configured to support internet or WiMAX traffic. In a typical deployment, without limitation, network communication module 218 provides an 802.3 Ethernet interface such that base station transceiver 210 can communicate with a conventional Ethernet based computer network. In this manner, the network communication module 218 may include a physical interface for connection to the computer network (e.g., Mobile Switching Center (MSC) ) . The terms “configured for, ” “configured to” and conjugations thereof, as used herein with respect to a specified operation or function, refer to a device, component, circuit, structure, machine, signal, etc., that is physically constructed, programmed, formatted and / or arranged to perform the specified operation or function.
[0035] The Open Systems Interconnection (OSI) Model (referred to herein as, “open system interconnection model” ) is a conceptual and logical layout that defines network communication used by systems (e.g., wireless communication device, wireless communication node) open to interconnection and communication with other systems. The model is broken into seven subcomponents, or layers, each of which represents a conceptual collection of services provided to the layers above and below it. The OSI Model also defines a logical network and effectively describes computer packet transfer by using different layer protocols. The OSI Model may also be referred to as the seven-layer OSI Model or the seven-layer model. In some embodiments, a first layer may be a physical layer. In some embodiments, a second layer may be a Medium Access Control (MAC) layer. In some embodiments, a third layer may be a Radio Link Control (RLC) layer. In some embodiments, a fourth layer may be a Packet Data Convergence Protocol (PDCP) layer. In some embodiments, a fifth layer may be a Radio Resource Control (RRC) layer. In some embodiments, a sixth layer may be a Non-Access Stratum (NAS) layer or an Internet Protocol (IP) layer, and the seventh layer being the other layer.
[0036] Various example embodiments of the present solution are described below with reference to the accompanying figures to enable a person of ordinary skill in the art to make and use the present solution. As would be apparent to those of ordinary skill in the art, after reading the present disclosure, various changes or modifications to the examples described herein can be made without departing from the scope of the present solution. Thus, the present solution is not limited to the example embodiments and applications described and illustrated herein. Additionally, the specific order or hierarchy of steps in the methods disclosed herein are merely example approaches. Based upon design preferences, the specific order or hierarchy of steps of the disclosed methods or processes can be re-arranged while remaining within the scope of the present solution. Thus, those of ordinary skill in the art will understand that the methods and techniques disclosed herein present various steps or acts in a sample order, and the present solution is not limited to the specific order or hierarchy presented unless expressly stated otherwise.
[0037] 2. Systems and Methods for Supporting Low Power Wake-Up Signals
[0038] UE energy efficiency is desirable / important for wireless communication. In this regard, devices (e.g., 5G devices) may have to be recharged weekly or daily, depending on individual usage time. In general, these devices (e.g., 5G devices) can consume tens of milliwatts in the RRC idle / inactive state and hundreds of milliwatts in the RRC connected state. The power consumption can depend on the configured length of wake-up periods, e.g., paging cycle, connected state DRX (C-DRX) cycle, or C-DRX on-duration length, etc. In certain implementations, to meet the battery life requirements above, long eDRX cycle, long C-DRX cycle, and / or long C-DRX on-duration length can be used. In certain implementations, this configuration can result in high latency and may not be suitable for such services with requirements of both long battery life and low latency. In this regard, the technical solutions described herein can be directed to low-power wake-up signal and / or receiver (LP-WUS / WUR) for NR systems. For instance, if the low-power wake-up signal and / or receiver (LP-WUS / WUR) is implemented in a power-efficient radio module, the UE may consume significantly less UE power for monitoring the LP-WUS / WUR compared to monitoring PEI / paging and physical downlink control channel (PDCCH) using the main radio. In certain implementations, the LP-WUS / WUR can be used to trigger UE MR PDCCH monitoring when it is desirable. The technical solutions described herein can also be directed to 6G or subsequent generations.
[0039] In certain embodiments, the configuration and determination of LP-WUS monitoring occasion (s) can occur for UE in the RRC_CONNECTED state. As shown in FIG. 3, the UE can monitor PDCCH during the active time of the C-DRX cycle for communication in RRC_CONNECTED state. The active time of the C-DRX may include the time period during which:
[0040] - the drx-onDurationTimer or drx-InactivityTimer configured for the DRX group is running; or
[0041] - the drx-RetransmissionTimerDL or drx-RetransmissionTimerUL is running on any serving cell in the DRX group; or
[0042] - the ra-ContentionResolutionTimer or msgB-ResponseWindow is running; or
[0043] - a Scheduling Request is sent on PUCCH and is pending; or
[0044] - a PDCCH indicating a new transmission addressed to the C-RNTI of the MAC entity has not been received after successful reception of a random access response for the random access preamble not selected by the MAC entity among the contention-based random access preamble.
[0045] In certain implementations, the UE may not monitor PDCCH when the UE is not in the active time of the C-DRX cycle for power saving. In certain implementations, the UE can determine the start occasion of the active time (e.g., the SFN and subframe to start the drx-onDurationTimer) based on the C-DRX cycle and the drx-StartOffset configured by the network, as specified below:
[0046] In certain implementations, the UE may not monitor PDCCH, for example, when the UE is not in the active time of the C-DRX cycle for power saving (s) . In some implementations, if the data arrives when the UE is not in the active time of the C-DRX cycle and the inactive time period is long, the data may not be transmitted timely, thereby causing the data transmission delay. In some implementations, longer inactive times can save more power for the UE. In this regard, balancing UE power consumption and data transmission delay is to be considered.
[0047] In certain implementations, the LP-WUS monitoring occasion can be introduced in the C-DRX flow chart to save more power for the UE and / or cause less data transmission delay. In some implementations, the monitoring LP-WUS can consume less UE power than the monitoring PDCCH. In some implementations, if the UE monitors PDCCH, for example, in response to detecting the associated LP-WUS, the configuration can reduce unnecessary PDCCH monitoring and save more power for the UE.
[0048] In certain implementations, as shown in FIG. 4, the UE can monitor the LP-WUS occasion (s) with a periodicity during the inactive time of the C-DRX cycle, e.g., when drx-onDurationTimer and drx-InactivityTimer configured for the DRX group are not running, and drx-HARQ-RTT-TimerDL and drx-HARQ-RTT-TimerUL, drx-RetransmissionTimerDL, and drx-RetransmissionTimerUL are not running on any serving cell in the DRX group. The UE can begin monitoring PDCCH after a timeOffset when the UE detects the associated LP-WUS (e.g., start drx-OnDurationTimer and / or start active time after a timeOffset when the UE detects the associated LP-WUS) . In some implementations, the UE can monitor LP-WUS with a periodicity (e.g., LP_WUS-periodicity) at the SFN and subframe when: [ (SFN × 10) + subframe number] modulo (LP_WUS-periodicity) = LPWUS-StartOffset,
[0049] or
[0050] floor ( [ (SFN × 10) + subframe number] modulo (LP_WUS-periodicity) ) = LPWUS-StartOffset,
[0051] where the LP_WUS-periodicity and / or LPWUS-StartOffset are configured by network, with a unit of ms, for example, the gNB sends / transmits LP_WUS-periodicity and / or LPWUS-StartOffset to the UE via UE-specific signaling. The LP_WUS-periodicity can represent a periodicity of the plurality of LP-WUS signals that a UE is to monitor, and the LPWUS-StartOffset can represent a time offset to determine monitoring occasions of the plurality of LP-WUS signals.
[0052] In certain implementations, whether LP-WUS is monitored is based on whether LP-WUS related parameters are configured. For example, the procedure for UE to monitor LP-WUS and / or start drx-OnDurationTimer can be:
[0053] In certain implementations, as shown in FIG. 4, the UE can monitor LP-WUS occasion (s) with a periodicity during the inactive time of the C-DRX cycle, e.g., when drx-onDurationTimer and drx-InactivityTimer configured for the DRX group are not running, and drx-HARQ-RTT-TimerDL and drx-HARQ-RTT-TimerUL, drx-RetransmissionTimerDL, and drx-RetransmissionTimerUL are not running on any serving cell in the DRX group. The UE can begin monitoring PDCCH after a timeOffset when the UE detects the associated LP-WUS (e.g., start drx-OnDurationTimer and start active time after a timeOffset when the UE detects the associated LP-WUS) . In some implementations, the UE monitors LP-WUS with a periodicity (e.g., LP_WUS-periodicity) at the SFN and subframe, which can be determined by: SFN = ( (referenceSFN*10 + referenceSubFrame -LP_WUS-timeOffset -N*LP_WUS- periodicity) mod 10240) / 10 subFrame = ( (referenceSFN*10 + referenceSubFrame -LP_WUS-timeOffset -N*LP_WUS- periodicity) mod 10240) mod 10,
[0054] or SFN = floor ( ( (referenceSFN*10 + referenceSubFrame -LP_WUS-timeOffset -N*LP_WUS- periodicity) mod 10240) / 10) subFrame = floor ( ( (referenceSFN*10 + referenceSubFrame -LP_WUS-timeOffset -N* LP_WUS-periodicity) mod 10240) mod 10) , where N is an integer from 0 to floor (DRX cycle / LP_WUS-periodicity) ;
[0055] or (SFN*10 + Subframe) mod LP_WUS-periodicity = (referenceSFN*10 + referenceSubFrame - LP_WUS-timeOffset) mod LP_WUS-periodicity,
[0056] or floor ( (SFN*10 + Subframe) mod LP_WUS-periodicity) = floor ( (referenceSFN*10 + referenceSubFrame -LP_WUS-timeOffset) mod LP_WUS-periodicity ) ,
[0057] where the referenceSFN and referenceSubFrame are the SFN and SubFrame where the drx-onDurationTimer is started in the legacy C-DRX mechanism; LP_WUS-periodicity is LP_WUS monitoring periodicity, with a unit of ms; LP_WUS-timeOffset is a time offset to determine monitoring occasions of the plurality of LP_WUS signals, with a unit of ms; Whether LP-WUS is monitored is based on whether LP-WUS related parameters are configured. For example, the procedure for UE to monitor LP-WUS and / or start drx-OnDurationTimer can be:
[0058] In certain implementations, as shown in FIG. 4, the UE can monitor LP-WUS occasion (s) with a periodicity (e.g., LP_WUS-periodicity) during the inactive time of the C-DRX cycle, e.g. when drx-onDurationTimer and drx-InactivityTimer configured for the DRX group are not running, and drx-HARQ-RTT-TimerDL and drx-HARQ-RTT-TimerUL, drx-RetransmissionTimerDL and drx-RetransmissionTimerUL are not running on any serving cell in the DRX group. The UE can begin monitoring PDCCH after a timeOffset when the UE detects the associated LP-WUS (e.g., start drx-OnDurationTimer and start active time after a timeOffset when the UE detects the associated LP-WUS) .
[0059] · In some implementations, if an integer LP_WUS-periodicity is configured, the UE can monitor LP-WUS occasion (s) with a periodicity (e.g., LP_WUS-periodicity) and a LP-WSU_timeOffset before the SFN and subframe, which can be determined based on the following: [ (SFN × 10) + subframe number] modulo (LP_WUS-periodicity) = mod (drx-StartOffset, LP_WUS-periodicity) ; or [ (SFN × 10) + subframe number -drx-StartOffset] modulo (LP_WUS-periodicity) = 0.
[0060] ● In some implementations, if an integer LP_WUS-periodicity is configured, the UE can periodically monitor LP-WUS occasion (s) with the SFN and subframe, which can be determined based on the following: [ (SFN × 10) + subframe number] modulo (LP_WUS-periodicity) = mod (drx-StartOffset- LPWUS_timeOffset, LP_WUS-periodicity) ; or [ (SFN × 10) + subframe number –drx-StartOffset-LPWUS_timeOffset] modulo (LP_WUS- periodicity) = 0.
[0061] ● In some implementations, if a non-integer LP_WUS-periodicity or an integer LP_WUS-periodicity is configured, the UE can periodically monitor LP-WUS occasion (s) with a LPWUS_timeOffset before the SFN and subframe, which can be determined based on the following: floor ( [ (DRX_SFN_COUNTER × 10240) + (SFN × 10) + subframe number] modulo (LP_WUS- periodicity) ) = drx-StartOffset mod LP_WUS-periodicity: or floor ( [ (DRX_SFN_COUNTER × 10240) + (SFN × 10) + subframe number - (drx-StartOffset) ] modulo (LP_WUS-periodicity) ) = 0.
[0062] ● In some implementations, if a non-integer LP_WUS-periodicity or an integer LP_WUS-periodicity is configured, the UE can periodically monitor LP-WUS with the SFN and subframe, which can be determined based on the following: floor ( [ (DRX_SFN_COUNTER × 10240) + (SFN × 10) + subframe number] modulo (LP_WUS- periodicity) ) = drx-StartOffset-LPWUS_timeOffset; or floor ( [ (DRX_SFN_COUNTER × 10240) + (SFN × 10) + subframe number - (drx-StartOffset- LPWUS_timeOffset) ] modulo (LP_WUS-periodicity) ) = 0.
[0063] ● The LP_WUS-periodicity is a factor of the C-DRX cycle, e.g., the result of the C-DRX cycle divided by the LP_WUS-periodicity is an integer. The LP_WUS-periodicity can be expressed by 1 / n, where n is an integer, e.g., the value 1 / n corresponds to the LP_WUS-periodicity with the value of floor (C-DRX cycle *1 / n) or ceil (C-DRX cycle *1 / n) . The LP_WUS-timeOffset is the LP_WUS monitoring time offset relative to the SFN and subframe where to monitor PDCCH, with a unit of ms. The DRX_SFN_COUNTER is initialized to 0 when the LP-WUS configuration is sent from the gNB and can be increased / incremented by 1 every time SFN=0. The LP_WUS-periodicity can represent a periodicity of the plurality of LP-WUS signals that a UE is to monitor, and the LPWUS-StartOffset can represent a time offset to determine monitoring occasions of the plurality of LP-WUS signals.
[0064] In some implementations, whether LP-WUS is monitored is based on whether LP-WUS related parameters, for example, LP_WUS-periodicity and / or LPWUS-StartOffset are configured. For example, the procedure for UE to monitor LP-WUS and / or start drx-OnDurationTimer can be:
[0065] In certain implementations, as shown in FIG. 4, the UE can monitor LP-WUS with a periodicity (e.g., LP_WUS-periodicity) during the inactive time of the C-DRX cycle, e.g., when drx-onDurationTimer and drx-InactivityTimer configured for the DRX group are not running, and drx-HARQ-RTT-TimerDL and drx-HARQ-RTT-TimerUL, drx-RetransmissionTimerDL, and drx-RetransmissionTimerUL are not running on any serving cell in the DRX group. The UE can begin monitoring PDCCH after a timeOffset when the UE detects the associated LP-WUS (e.g., start drx-OnDurationTimer and / or start active time after a timeOffset when the UE detects the associated LP-WUS) . In some implementations, the UE can monitor LP-WUS occasion (s) with a periodicity (e.g., LP_WUS-periodicity) at the SFN and subframe, which can be determined by the following: [ (SFN × 10) + subframe number] modulo (LP_WUS-periodicity) = UE_ID modulo LP_WUS- periodicity,
[0066] or floor ( [ (SFN × 10) + subframe number] modulo (LP_WUS-periodicity) ) =floor (UE_ID modulo LP_WUS-periodicity) ,
[0067] where the UE-ID is UE’s AS identity, e.g., C-RNTI or NAS identity, and the LP_WUS-periodicity is configured by network, for example, the gNB sends / transmits LP_WUS-periodicity to UE via UE-specific signaling. The LP_WUS-periodicity can represent a periodicity of the plurality of LP-WUS signals that a UE is to monitor.
[0068] In certain implementations, whether LP-WUS is monitored is based on whether LP-WUS related parameters are configured. For example, the procedure for UE to monitor LP-WUS and / or start drx-OnDurationTimer can be:
[0069] In the solutions / configurations above, the UE can determine whether a detected LP-WUS is associated with the UE (e.g., addressed for the UE) based on one of the following: includes the UE’s ID information in the received LP-WUS; includes UE’s group ID information in the received LP-WUS, includes a combination of UE's group ID and UE's ID information in the received LP-WUS, or the LP-WUS is scrambled by the UE’s ID information. or the LP-WUS is scrambled by the UE group ID, and UE’s ID information is included in the LP-WUS. The UE’s ID information can be full UE ID or partial UE ID (e.g., partial bits of the UE’s ID, LSBs of UE’s ID) , The UE’s ID can be C-RNTI, or a RNTI defined for LP-WUS or AS ID configured by network. The group ID can be configured by NW.
[0070] In some implementations, the UE may monitor LP-WUS during the active time of the C-DRX cycle when there is no data transmission and re-transmission procedure, e.g., when the drx-InactivityTimer configured for the DRX group is running, but at least the timer drx-RetransmissionTimerDL and drx-RetransmissionTimerUL on any serving cell in the DRX group are not running if the LP-WUS is configured per DRX group; or when the drx-InactivityTimer configured for the DRX group is running, but at least the timer drx-RetransmissionTimerDL and drx-RetransmissionTimerUL on the serving cell in the DRX group are not running if the LP-WUS is configured per serving cell.
[0071] In some implementations, the UE can provide a preferred LP_WUS-periodicity via a UEAssistanceInformation message, which the network can use to decide / determine the LP_WUS-periodicity to be used. In some implementations, the UEAssistanceInformation can provide at least one of the following information to assist the network in configuring the LP-WUS resource: UE preferred symbol number for LP-WUS, UE preferred repetition number of LP-WUS, UE preferred frequency location of LP-WUS, UE preferred frequency bandwidth of LP-WUS, or UE preferred timeOffset between LP-WUS and PDCCH.
[0072] In certain embodiments, as shown in FIG. 5, the UE can report its LP-WUS support capability in the RRC_CONNECTED state to the base station, for example, via the UECapabilityInformation message or the UEAssistanceInformation message. The base station can send / transmit / provide the LP-WUS configuration to the UE, for example, via RRCReconfiguration, RRCResume, or RRCSetup message. In some implementations, the LP-WUS configuration may include at least one of the LP_WUS time offset or LP-WUS periodicity to determine the LP-WUS monitoring occasion. In some implementations, the LP-WUS configuration may include an LP_WUS activation indication / indicator, which can indicate the LP_WUS initial status, such as activated or deactivated.
[0073] In certain implementations, when the base station decides / determines to activate LP-WUS for the UE in the RRC_CONNECTED state, the base station can send / transmit DCI or MAC CE, including the LP_WUS activation indication, to activate LP-WUS. In certain implementations, when the base station decides to deactivate LP-WUS for UE in the RRC_CONNECTED state, the base station can send / transmit DCI or MAC CE, including the LP_WUS deactivation indication, to deactivate LP-WUS. In certain implementations, the LP-WUS can be activated or deactivated per cell or per C-DRX cell group. In certain implementations, the MAC CE to activate or deactivate LP-WUS for the UE in the RRC_CONNECTED state can be one of the following:
[0074] (1) One MAC CE with a fixed size of zero bits for LP-WUS activation, which can be identified by a MAC subheader with a one-octet eLCID, two-octet eLCID, legacy LC ID, or LC ID when a field with a reserved bit or extended bit in the MAC subheader is set to 1; one MAC CE with a fixed size of zero bits for LP-WUS deactivation, which can be identified by a MAC subheader with another one-octet eLCID, two-octet eLCID, legacy LC ID, or LC ID when a field with a reserved bit or extended bit in MAC subheader is set to 1;
[0075] (2) One MAC CE to indicate the LP-WUS activation or deactivation. For example, FIG. 6 shows an example of the MAC CE in which: the bit of C-DRX Group 1 set to 0 can be used to indicate that the LP-WUS for C-DRX Group 1 is deactivated, and / or the bit of C-DRX Group 1 set to 1 can be used to indicate that the LP-WUS for C-DRX Group 1 is activated; etc.
[0076] In certain implementations, the base station can decide / determine whether to activate or deactivate the LP-WUS for UE in the RRC_CONNECTED state based on LP-WUS condition reporting from UE. For example, FIG. 7 shows an example for UE to report the LP-WUS condition to use, in which:
[0077] (1) The base station can send / transmit LP-WUS-activation and deactivation condition reporting configuration to UE via an RRC (re-) configuration message, for example, when configuring or re-configuring LP-WUS parameters for UE in the RRC_CONNECTED state; or
[0078] (2) The UE can evaluate the LP-WUS-activation or deactivation condition and report the LP-WUS-activation or deactivation condition fulfillment indication to the base station when the condition is fulfilled via the MeasurementReport message or the UEAssistanceInformation message.
[0079] In certain implementations, the LP-WUS-activation and deactivation condition reporting configuration may include at least one of the following: event A1 parameters (e.g., event A1 threshold and hysteria) or event A2 parameters (e.g., event A2 threshold and hysteria) , as specified below:
[0080] ● Event A1 (serving becomes better than the threshold) can be used as an activation condition for LP_WUS.
[0081] In this regard, the UE is to:
[0082] 1> Consider the entering condition for this event to be satisfied when condition A1, as specified below, is fulfilled, and report Event A1 to the base station.
[0083] Inequality A1 (Entering condition)
[0084] Ms -Hys_A1 > Thresh_A1
[0085] The variables in the formula can be defined as follows:
[0086] Ms is the measurement result of the serving cell, not account for any offsets.
[0087] Hys_A1 is the hysteresis parameter for this event (e.g., hysteresis as defined within reportConfigNR for this event) .
[0088] Thresh_A1 is the threshold parameter for this event (e.g., a1-Threshold as defined within reportConfigNR for this event) .
[0089] Ms is expressed in dBm in the case of RSRP or in dB in the case of RSRQ and / or RS-SINR.
[0090] Hys is expressed in dB.
[0091] Thresh is expressed in the same unit as ms.
[0092] ● Event A2 (serving becomes worse than the threshold) can be used as an activation condition for LP_WUS.
[0093] In this regard, the UE is to:
[0094] 1> Consider the entering condition for this event to be satisfied when condition A2-1, as specified below, is fulfilled, and report Event A1 to the base station.
[0095] Inequality A2 (Entering condition)
[0096] Ms + Hys_A2 < Thresh_A2
[0097] The variables in the formula can be defined as follows:
[0098] Ms is the measurement result of the serving cell, not account for any offsets.
[0099] Hys_A2 is the hysteresis parameter for this event (e.g., hysteresis as defined within reportConfigNR for this event) .
[0100] Thresh_A2 is the threshold parameter for this event (e.g., a2-Threshold as defined within reportConfigNR for this event) .
[0101] Ms is expressed in dBm in the case of RSRP or in dB in the case of RSRQ and / or RS-SINR.
[0102] Hys is expressed in dB.
[0103] Thresh is expressed in the same unit as ms.
[0104] ● In certain embodiments / implementations,
[0105] Hys_A1 and Hys_A2 can be the same parameter, e.g., Hys.
[0106] Thresh_A1 and Thresh_A2 can be the same parameter, e.g. Thresh.
[0107] Then:
[0108] Event A1 condition will be: Ms -Hys > Thresh
[0109] Event A2 condition will be: Ms + Hys < Thresh
[0110] In which case, the UE can report to the base station that the LP-WUS activation condition is fulfilled when Ms -Hys > Thresh and / or the UE can report to the base station that the LP-WUS deactivation condition is fulfilled (or the activation condition is not fulfilled) when Ms + Hys <Thresh.
[0111] ● In certain embodiments / implementations,
[0112] Hys_A1 and Hys_A2 may not be configured.
[0113] Then:
[0114] Event A1 condition will be: Ms > Thresh_A1
[0115] Event A2 condition will be: Ms < Thresh_A2
[0116] In which case, the UE can report to the base station that the LP-WUS activation condition is fulfilled when Ms > Thresh_A1 and / or the UE can report to the base station that the LP-WUS deactivation condition is fulfilled (or activation condition is not fulfilled) when Ms < Thresh_A2.
[0117] In certain implementations, to avoid frequent LP-WUS activation / deactivation operations, at least one of the following methods may be used:
[0118] ● A time-to-trigger for Event A1 can be used, and if the condition of Event A1 is fulfilled during the time-to-trigger, the UE will report Event A1 (or report that the LP-WUS activation condition is fulfilled) . In some implementations, the time-to-trigger can be sent / transmitted from the base station to the UE or can be pre-defined.
[0119] ● A prohibit timer for Event A1 can be used, and when the UE reports Event A2 (or reports that the activation condition is not fulfilled) , the UE can start the prohibit timer for Event A1. After the Prohibit timer is not running (e.g., not started or expired) , Event A1 can be evaluated and / or reported.
[0120] In some embodiments, e.g., in a non-terrestrial network (NTN) case, the criteria for LP-WUS activation / deactivation can be based on the distance between the UE and a reference location (e.g., cell center point) compared with a distance threshold: when the distance is less than a distance Thresh configured by network, the UE can begin monitoring LP-WUS or reporting the related information to network for activating the LP-WUS; and when the distance is larger than a distance Thresh configured by network, the UE can stop monitoring LP-WUS or reporting the related information to network for deactivating the LP-WUS.
[0121] In some embodiments, e.g., in the NTN case, time-based criteria can be used for the LP-WUS activation / deactivation. The satellite moves in a fixed orbit, and based on a timer, it can be determined whether LP-WUS can be activated, e.g., the distance between the UE and a reference location is within a distance range.
[0122] In certain implementations, where the UE considers / determines that the LP-WUS activation condition is fulfilled / met, the UE can autonomously activate LP-WUS monitoring (e.g., begin monitoring LP-WUS without reporting the event to the base station) . In some implementations, where the UE considers / determines that the LP-WUS deactivation condition is fulfilled / met, the UE can autonomously deactivate LP-WUS monitoring (e.g., stop monitoring LP-WUS without reporting the event to the base station) . In some implementations, the UE can provide an LP_WUS activation preference, e.g., by UEAssistanceInformation message, which the network can use to decide / determine whether to activate LP_WUS.
[0123] In certain embodiments, the UE may choose / decide / determine to perform relaxed measurements (e.g., omit performing related measurements) for intra-frequency cells, NR inter-frequency cells, or inter-RAT frequency cells when the UE determines that it is not at the cell edge and is in a stationary or low mobility state. In some implementations, the UE is to always perform serving cell measurement, which can still consume UE power. In this regard, to reduce UE power consumption for serving cell measurements, at least one of the following methods may be used:
[0124] (1) Serving cell measurement relaxation when LP-WUS / SS can be measured
[0125] The serving cell measurement relaxation can indicate that a UE can perform the serving cell measurement with a larger DRX cycle length. For example, the UE, which supports LP-WUS / SS, may relax the serving cell measurement requirement defined with the DRX cycle from the DRX cycle length of DRX_cycle to the DRX cycle length of min (numDRX- CyclesRelaxed*DRX_cycle, 10.24 seconds) when the following conditions are met / satisfied:
[0126] - LP-SS is configured,
[0127] - The serving cell measurement relaxation factor numDRX-CyclesRelaxed, configured by the network or predefined by the specification, and
[0128] - The radio quality of the serving cell is good enough.
[0129] Whether the radio quality is good enough can be determined by at least one of the following:
[0130] - The relaxed monitoring criteria for neighboring cells are fulfilled (e.g., the UE is not at the cell edge (RSRP is larger than a threshold) and the UE is stationary or in low mobility (the RSRP change is less than a second threshold) ) ,
[0131] - The LP-SS RSRP is larger than a threshold, and the threshold can be configured by an absolute threshold with unit dBm or by a relative threshold, e.g., an offset (with unit of dB) relative to the neighbor cell relaxed measurement criteria or relative to the cell selection threshold,
[0132] - The LP-SS RSRP change is less than a third threshold, and / or
[0133] - The distance between UE and a reference location (e.g., cell center point) is less than a third fourth threshold: when the distance is less than a distance thresh configured by network, the UE can begin performing the serving cell measurement offloading; and when the distance is larger than a distance thresh configured by network, the UE can stop the serving cell measurement offloading.
[0134] (2) Serving cell measurement offloading to low-power radio when LP-WUS / SS can be measured and neighbor cell measurement relaxation is satisfied
[0135] When the UE is not at the cell edge (e.g., the SSB based RSRP and / or LP-SS based RSRP is larger than the RSRP threshold configured for serving cell measurement offloading) , and the UE is stationary or in low mobility (e.g., the SSB based RSRP and / or LP-SS based RSRP change relative to the RSRP_reference is less than a RSRP change threshold configured for serving cell measurement offloading) , the UE can enter the serving cell measurement offloading state, e.g., offloading the serving cell measurement (e.g., turning off the main radio) and performing the serving cell measurement based on LP-SS.
[0136] In certain implementations, the RSRP reference can be set based on the following criteria:
[0137] - After selecting or reselecting a new cell,
[0138] - If (RSRP -RSRP_reference) > 0, or
[0139] - If UE exist in the serving cell measurement offloading state,
[0140] - If serving cell measurement offloading entering condition has not been met / satsified for a time duration configured by the network or predefined:
[0141] - The UE is to set the value of RSRP_reference to the current RSRP value of the serving cell.
[0142] In certain implementations, when the UE is at the cell edge (e.g., LP-SS based RSRP is less than the RSRP threshold configured for serving cell measurement offloading) , and the UE is not stationary and not in low mobility (e.g., the LP-SS based RSRP change relative to the RSRP_reference is larger than the RSRP change threshold configured for serving cell measurement offloading) , the UE can exit the serving cell measurement offloading state. For example, the UE can start performing the serving cell measurement based on SSB (e.g., turning on the main radio) .
[0143] In certain implementations, the RSRP reference can be set based on the following criteria:
[0144] - If UE enters the serving cell measurement offloading state, or
[0145] - If (RSRP -RSRP_reference) > 0, or
[0146] - If serving cell measurement offloading existing condition has not been met / satisfied for a time duration configured by the network or predefined:
[0147] - The UE is to set the value of RSRP_reference to the current RSRP value of the serving cell.
[0148] In certain implementations, the serving cell measurement offloading threshold (e.g., the threshold used to evaluate whether the UE is at the cell edge and / or whether the UE is in a low mobility state or stationary state) can use the corresponding threshold used for neighbor cell relaxed measurement, or the corresponding threshold used for neighbor cell relaxed measurement plus an offset. In some implementations, the offset can be configured by the base station (e.g., the base station can send / transmit the threshold offset to the UE via UE-specific signaling) . In some implementations, the offset can be a positive value or a negative value.
[0149] In certain implementations, when SSB and LP-SS are measured (e.g., for serving cell measurement relaxation cases) , a LP-SS measurement offset can be used to compensate the measurement result between the LP-SS based measurement and the SSB based measurement. For example, the UE can add an offset to the LP-SS based measurement result or minus / subtract an offset from the LP-SS based measurement result. The UE can use the result and the SSB based measurement for measurement filtering and / or performing RRM operations (e.g., for cell reselection evaluation) .
[0150] In certain embodiments, e.g., in the NTN case, the criteria for serving cell measurement offloading can be based on the distance between the UE and a reference location (e.g., cell center point) compared with a distance threshold: when the distance is less than a distance thresh configured by network, the UE can begin performing the serving cell measurement offloading; and when the distance is larger than a distance thresh configured by network, the UE can stop the serving cell measurement offloading.
[0151] In certain embodiments, the UE may use LP-WUS in non-RRC_CONNECTED states (e.g., RRC_IDLE and RRC_INACTIVE states or in an RRC state where the UE may not monitor dedicated PDCCH) to reduce power consumption. In some implementations, if the LP-WUS configuration is provided in system information, the UE in the RRC_IDLE or RRC_INACTIVE state supporting LP-WUS can monitor LP-WUS using LP-WUS parameters in system information according to the following configurations:
[0152] ● If the LP-WUS monitoring conditions (e.g., RSRP threshold for UE to determine whether to monitor LP-WUS) are configured and the condition for UE to monitor LP-WUS is met / satisfied (e.g., the RSPP is larger than a threshold) , or the LP-WUS monitoring condition (s) (RSRP threshold for UE to determine whether to monitor LP-WUS) is not configured:
[0153] ● If PEI monitoring conditions are satisfied (e.g., PEI configuration is provided in system information and the UE supports PEI monitoring, etc. ) , the UE in the RRC_IDLE or RRC_INACTIVE state, supporting LP-WUS, can monitor LP-WUS before PEI with a timeOffset configured by the network or predefined based on the following criteria: if the LP-WUS is detected, the UE can begin monitoring the PEI and / or PAGING as legacy. The UE can determine the LP-WUS subgrouping to be monitored as follows:
[0154] ■ If CN assigned LP-WUS subgrouping is provided, the UE can monitor the CN assigned LP-WUS subgrouping.
[0155] ■ If CN assigned LP-WUS subgrouping is not provided, the UE can monitor the LP-WUS subgrouping with the subgroup ID determined by the formula below:
[0156] SubgroupID = floor (UE_ID / (N*Ns*subgroupsNumofPEI) ) mod subgroupsNumForUEIDofLPWUS) + subgroupsStartNoForUEIDofLPWUS;
[0157] or
[0158] SubgroupID = UE-ID_H mod subgroupsNumForUEIDofLPWUS) + subgroupsStartNoForUEIDofLPWUS;
[0159] or
[0160] SubgroupID = (floor (UE-ID_H / (TeDRX *X) ) + subgroupsStartNoForUEIDofLPWUS, If the UE operates in eDRX with an eDRX cycle longer than 1024 radio frames.
[0161] In some implementations, the CN assigned LP-WUS subgrouping can be provided only if the CN assigned PEI subgrouping is provided. In this regard, the UE can monitor the LP-WUS subgrouping with the subgroup ID determined by the formula below:
[0162] SubgroupID = (floor (UE_ID / (N*Ns*subgroupsNumForUEIDofPEI) ) mod subgroupsNumForUEIDofLPWUS) + subgroupsStartNoForUEIDofLPWUS
[0163] where:
[0164] N: number of total paging frames in the paging cycle (T) ;
[0165] Ns: number of paging occasions for a PF;
[0166] UE_ID: LSBs of 5G-S-TMSI, e.g., 5G-S-TMSI mod X, where X is a predefined integer;
[0167] UE_ID_H: LSBs of 5G-S-TMSI HASH ID, e.g., 5G-S-TMSI HASH ID mod Y, where Y is a predefined integer;
[0168] subgroupsNumForUEIDofPEI is the number of PEI subgroups for UE_ID based subgrouping in a PO, which is broadcasted in system information;
[0169] subgroupsNumForUEIDofLPWUS is the number of LP_WUS subgroups for UE_ID based subgrouping in a PO, which is broadcasted in system information; and
[0170] subgroupsStartNoForUEIDofLPWUS is the start number of LP_WUS subgroups for UE_ID based subgrouping in a PO. For example, if only the UE_ID based LP-WUS subgrouping is supported (e.g., the CN assigned LP-WUS subgrouping is not supported) , subgroupsStartNoForUEIDofLPWUS =0; else, the subgroupsStartNoForUEIDofLPWUS = the maximum number of CN assigned LP-WUS subgroups +1, or the maximum number of LP-WUS subgroups in a PO, or the number of PEI subgroups for UE_ID based subgrouping in a PO.
[0171] X is an integer configured by network or predefined.
[0172] TeDRX is the UE-specific eDRX cycle in hyper-frames.
[0173] ● If PEI monitoring conditions are not satisfied (e.g., PEI configuration is not provided in system information or UE does not support PEI monitoring, etc. ) , the UE in the RRC_IDLE or RRC_INACTIVE state supporting LP-WUS can monitor LP-WUS before the PEI with a timeOffset configured by network or predefined based on the following criteria: if the LP-WUS is detected, the UE can begin monitoring the PEI and / or PAGING as legacy. The UE can determine the LP-WUS subgrouping to be monitored as follows:
[0174] ■ If CN assigned LP-WUS subgrouping is provided, the UE can monitor the CN assigned LP-WUS subgrouping.
[0175] ■ If CN assigned LP-WUS subgrouping is not provided, the UE can monitor the LP-WUS subgrouping with the subgroup ID determined by the formula below: SubgroupID = (floor (UE_ID / (N*Ns) ) mod subgroupsNumForUEIDofLPWUS) + subgroupsStartNoForUEIDofLPWUS;
[0176] or SubgroupID = UE-ID_H mod subgroupsNumForUEIDofLPWUS) + subgroupsStartNoForUEIDofLPWUS;
[0177] or
[0178] SubgroupID = (floor (UE-ID_H / (TeDRX *X) ) + subgroupsStartNoForUEIDofLPWUS, if the UE operates in eDRX with an eDRX cycle longer than 1024 radio frames.
[0179] where:
[0180] N: number of total paging frames in paging cycle (T) ;
[0181] Ns: number of paging occasions for a PF;
[0182] UE_ID: LSBs of 5G-S-TMSI, e.g., 5G-S-TMSI mod X, X is a predefined integer;
[0183] UE_ID_H: LSBs of 5G-S-TMSI HASH ID, e.g., 5G-S-TMSI HASH ID mod Y, Y is a predefined integer;
[0184] subgroupsNumForUEIDofLPWUS is the number of LP_WUS subgroups for UE_ID based subgrouping in a PO, which is broadcasted in system information; and
[0185] subgroupsStartNoForUEIDofLPWUS is the start number of LP_WUS subgroups for UE_ID based subgrouping in a PO. For example, if the UE_ID based LP-WUS subgrouping is supported, subgroupsStartNoForUEIDofLPWUS =0; else, the subgroupsStartNoForUEIDofLPWUS = the maximum number of CN assigned LP-WUS subgroups +1, or the maximum number of LP-WUS subgroups in a PO, or the number of PEI subgroups for UE_ID based subgrouping in a PO.
[0186] X is an integer configured by network or predefined.
[0187] TeDRX is the UE-specific eDRX cycle in Hyper-frames.
[0188] In some implementations, the UEs in one LP-WUS subgroup may not be assigned to the same PEI subgroup. For example, UEs in one LP-WUS subgroup can be split into different PEI subgroups. In this regard, the configuration can save UE power when monitoring PEI after detecting LP-WUS.
[0189] ● If the LP-WUS monitoring conditions (RSRP threshold for UE to determine whether to monitor LP-WUS) are configured and the condition for UE to monitor LP-WUS is not satisfied:
[0190] ● the UE can monitor the PEI and / or PAGING as legacy.
[0191] In certain implementations, the CN assigned LP-WUS subgroup ID can be negotiated by NAS, e.g., in the tracking area update procedure or registration procedure. For example, the UE can provide paging provability information or LP-WUS support indication to the CN (e.g., AMF) in a tracking area update request or registration request message, and the CN (e.g., AMF) can allocate an LP-WUS subgroup ID (e.g., based on paging provability information, LP-WUS support indication, and / or UE mobility information) and send / transmit the allocated LP-WUS subgroup ID to the UE by tracking area update accept or registration accept message.
[0192] In certain implementations, the CN (e.g., AMF) can send / transmit the LP-WUS subgroup ID to gNB via paging for RRC_IDLE UE to trigger LP_WUS for RRC_IDLE UE or via core network assistance information for RRC INACTIVE for RRC_CONNECTED UE to trigger LP_WUS for RRC_INACTIVE UE. In certain implementations, the CN (e.g., AMF) can send / transmit the UE provided paging provability information or LP-WUS support indication to the gNB via paging for RRC_IDLE UE to decide / determine the LP_WUS subgroup ID for RRC_IDLE UE or via core network assistance information for RRC INACTIVE for RRC_CONNECTED UE to decide / determine the LP_WUS subgroup ID for RRC_INACTIVE UE.
[0193] In certain implementations, one LP-WUS can correspond to multiple POs of the same UE. For example, one LP-WUS can correspond to the PO number of po-NumPerLPWUS. The LP-WUS time offset can be relative to the PO, as determined by the following criteria:
[0194] ● If eDRX with an eDRX cycle longer than 1024 radio frames is configured, po-NumPerLPWUS can be / indicate consecutive POs mapped to the LP-WUS. The consecutive POs can be counted from the first PO in the PTW. For example, if the PO sequence number is Mth in the PTW, which can be counted from the first PO in the PTW with a start number of 0, the LP_WUS time offset can be relative to the PO when M mod po-NumPerLPWUS = 0.
[0195] In certain implementations, po-NumPerLPWUS can be / indicate consecutive POs mapped to the LP-WUS, and the PF of the PO that the LP_WUS time offset corresponds to can be determined by the following formula: PF_LPWUS = (SFN for PF) -T* (floor (SFN for PF / T) mod po-NumPerLPWUS;
[0196] or floor ( (SFN for PF) / T) mod po-NumPerLPWUS = 0;
[0197] or floor ( (H-SFN*1024 + SFN for PF) / T) mod po-NumPerLPWUS = 0;
[0198] or (SFN + PF_offset) mod (T*po-NumPerLPWUS) = ( (T*po-NumPerLPWUS) div (N*po- NumPerLPWUS) * (UE_ID mod (N*po-NumPerLPWUS) )
[0199] or
[0200] if the PO sequence number in the SFN cycle (0. . . 123) and / or H-SFN (10. . . 123) is Mth, which is counted from the first PO in the SFN cycle (0. . . 123) and / or H-SFN (10. . . 123) with a start number of 0, the LP_WUS time offset can be relative to the PO when M mod po-NumPerLPWUS = 0.
[0201] In certain implementations, po-NumPerLPWUS = min (po-NumPerLPWUS, 1024 / T) , which means / indicates that T*po-NumPerLPWUS is to be no larger than 1024 radio frames.
[0202] where:
[0203] T: A paging cycle (T) ;
[0204] SFN for PF: SFN number of the paging frame;
[0205] UE_ID: LSBs of 5G-S-TMSI, e.g., 5G-S-TMSI mod X, where X is a predefined integer;
[0206] PF_offset: Offset used for PF determination as configured by the network;
[0207] po-NumPerLPWUS: The PO number of the same UE corresponds to one LP-WUS; and
[0208] PF_LPWUS: The paging frame to which the LP-WUS time offset is relative, when one LP-WUS corresponds to multiple POs.
[0209] In certain implementations, one LP-WUS can correspond to multiple POs of different UEs. For example, one LP-WUS can correspond to a continuous number of po-NumPerLPWUS POs, where po-NumPerLPWUS is a factor of PO numbers in one DRX cycle (T) . The LP-WUS time offset can be relative to the PO, determined by the following formula:
[0210] If po-NumPerLPWUS >=Ns
[0211] PF_LPWUS = (SFN for PF) - ( (UE_ID mod N) mod floor (po-NumPerLPWUS / Ns) ) *T / N
[0212] i_s_LPWWUS =0
[0213] If po-NumPerLPWUS < Ns
[0214] PF_LPWWUS=SFN for PF
[0215] i_s_LPWWUS=i_s-i_smod (po-NumPerLPWUS)
[0216] where:
[0217] T: A paging cycle (T) ;
[0218] N: A number of total paging frames in T;
[0219] Ns: A number of paging occasions for a PF;
[0220] SFN for PF: SFN number of the paging frame;
[0221] UE_ID: LSBs of 5G-S-TMSI, e.g., 5G-S-TMSI mod X, where X is a predefined integer.
[0222] po-NumPerLPWUS: The PO number of the same UE corresponds to one LP-WUS;
[0223] PF_LPWUS: The paging frame to which the LP-WUS time offset is relative, when one LP-WUS corresponds to multiple POs.
[0224] i_s_LPWWUS: The index of the paging occasion in one paging frame to which the LP-WUS time offset is relative, when one LP-WUS corresponds to multiple POs.
[0225] In some embodiments, the UE can determine whether a LP-WUS is intended for its own LP-WUS (e.g., addressed for the UE) based on whether the UE’s subgroup ID is included in the received LP-WUS. In some cases, the bit map included in the LP-WUS payload can be used to indicate which subgroups are to be addressed, e.g., the first bit can indicate the first subgroup; and the second bit can indicate the second subgroup, etc. If a bit is set to 1, it indicates that the corresponding subgroup is to be woken up to monitor PEI and / or PAGING. If a bit is set to 0, it indicates that the corresponding subgroup is not to be woken up, e.g., does not need to monitor PEI and / or PAGING. In some implementations, the bits map included in the LP-WUS can be used to indicate which subgroups are to be addressed, e.g., the first bit can indicate the first subgroup; and the second bit can indicate the second subgroup, etc. If a bit is set to 1, it can indicate that the subgroup is to be woken up to monitor PEI and / or PAGING. If the bit is set to 0, it can indicate that the subgroup is not to be woken up, e.g., does not need to monitor PEI and / or PAGING. In some cases, an explicit UE ID or UE group ID can be included in the LP-WUS payload to indicate which UE or UE subgroup is to be addressed.
[0226] Referring now to FIG. 8, which illustrates a flow diagram of a method 800 for supporting low power wake-up signals. The method 800 may be implemented using any of the components and devices detailed herein in conjunction with FIGS. 1–7. In an overview, the method 800 may include a wireless communication device receiving configurations of one or more low-power wake-up signal (LP-WUS) parameters from a wireless communication node (STEP 802) . The method 800 may include the wireless communication device monitoring, based on the configurations of the one or more LP-WUS parameters, a plurality of LP-WUS signals during an inactive period of a connected state DRX (C-DRX) cycle (STEP 804) . The method 800 may include a wireless communication node sending configurations of one or more low-power wake-up signal (LP-WUS) parameters to a wireless communication device (STEP 806) . The method 800 may include the wireless communication node configuring the wireless communication device to monitor, based on the configurations of the one or more LP-WUS parameters, a plurality of LP-WUS signals during an inactive period of a connected state DRX (C-DRX) cycle (STEP 808) .
[0227] In certain configurations, a wireless communication device can receive / obtain / acquire configurations of one or more low-power wake-up signal (LP-WUS) parameters from a wireless communication node (STEP 802) . The wireless communication device can monitor, based on the configurations of the one or more LP-WUS parameters, a plurality of LP-WUS signals during an inactive period of a connected state DRX (C-DRX) cycle (STEP 804) . In certain configurations, the LP-WUS parameters may include at least one of the following: LP_WUS-periodicity, LPWUS-StartOffset, referenceSFN, or referenceSubFrame, and wherein the LP_WUS-periodicity represents a periodicity of the plurality of LP-WUS signals that a UE is to monitor, the LPWUS-StartOffset represents a time offset to determine monitoring occasions of the plurality of LP-WUS signals, the referenceSFN represents an SFN used to determine the start occasion of a drx-OnDurationTimer, and the referenceSubFram represents a SubFrame used to determine the start occasion of the drx-OnDurationTimer.
[0228] In certain configurations, the wireless communication device can monitor the plurality of LP-WUS signals at subframes determined based on the LP_WUS-periodicity and LPWUS-StartOffset. In certain configurations, the wireless communication device can monitor the plurality of LP-WUS signals at subframes determined based on the LP_WUS-periodicity, referenceSFN, and referenceSubFrame. In certain configurations, the wireless communication device can monitor the plurality of LP-WUS signals before subframes are determined based on the LP_WUS-periodicity and LPWUS-StartOffset. The LP_WUS-periodicity can be configured as a non-integer number. In certain configurations, the wireless communication device can monitor the plurality of LP-WUS signals before subframes are determined based on the LP_WUS-periodicity and LPWUS-StartOffset. The LP_WUS-periodicity can be configured as an integer number. In certain configurations, the wireless communication device can monitor the plurality of LP-WUS signals at subframes determined based on the LP_WUS-periodicity and UE_ID. In certain configurations, in response to detecting one of the LP-WUS signals at a corresponding subframe, the drx-OnDurationTimer can start monitoring a PDCCH from the subframe plus a time offset.
[0229] In certain configurations, a wireless communication node can send / transmit / provide configurations of one or more low-power wake-up signal (LP-WUS) parameters to a wireless communication device (STEP 806) . During an inactive period of a connected state DRX (C-DRX) cycle, the wireless communication device can be configured to monitor, based on the configurations of the one or more LP-WUS parameters, a plurality of LP-WUS signals (STEP 808) . In certain configurations, a wireless communication device can receive / obtain / acquire configurations of one or more low-power wake-up signal (LP-WUS) parameters in system information from a wireless communication node. The wireless communication device can monitor, based on the configurations of the one or more LP-WUS parameters, a plurality of LP-WUS signals, when configured in a non-RRC_CONNECTED state.
[0230] In certain configurations, upon identifying that a paging early indication (PEI) monitoring condition is met, the wireless communication device can monitor the LP-WUS signals before a PEI corresponding to the PEI monitoring condition with a time offset. In certain configurations, upon identifying that a paging early indication (PEI) monitoring condition is not met, the wireless communication device can monitor the LP-WUS signals before a paging occasion with a time offset. In certain configurations, upon identifying that a core network-assigned LP-WUS subgrouping is provided, the wireless communication device can monitor the LP-WUS subgroup assigned by the core network. In certain configurations, upon identifying that no core network-assigned LP-WUS subgrouping is provided, the wireless communication device can monitor LP-WUS subgroup decided based on UE identity.
[0231] In certain configurations, the subgroup IDs can be determined based on at least one of the following: a number of total paging frames in a paging cycle, a number of paging occasions for a PF, UE_ID, UE_ID_H, subgroupsNumForUEIDofPEI, subgroupsNumForUEIDofLPWUS, or subgroupsStartNoForUEIDofLPWUS, and wherein the UE_ID represents at least one of the UE identity or partial bits of the UE identity, the UE_ID_H represents at least one of a hashed UE identity or partial bits of the hashed UE identity, the subgroupsNumForUEIDofPEI represents a number of PEI subgroups for UE_ID based subgrouping in a PO, the subgroupsNumForUEIDofLPWUS represents a number of LP_WUS subgroups for UE_ID based subgrouping in a PO, the subgroupsStartNoForUEIDofLPWUS represents a starting number of LP_WUS subgroups for UE_ID based subgrouping in a PO.
[0232] In certain configurations, a wireless communication node can send / transmit / provide configurations of one or more low-power wake-up signal (LP-WUS) parameters in system information to a wireless communication device. When configured in a non-RRC_CONNECTED state, the wireless communication device can be configured to monitor, based on the configurations of the one or more LP-WUS parameters, a plurality of LP-WUS signals.
[0233] While various embodiments / implementations of the present solution have been described above, it should be understood that they have been presented by way of example only, and not by way of limitation. Likewise, the various diagrams may depict an example architecture or configuration, which are provided to enable persons of ordinary skill in the art to understand example features and functions of the present solution. Such persons would understand, however, that the solution is not restricted to the illustrated example architectures or configurations but can be implemented using a variety of alternative architectures and configurations. Additionally, as would be understood by persons of ordinary skill in the art, one or multiple features of one embodiment / implementation can be combined with one or multiple features of another embodiment / implementation described herein. Thus, the breadth and scope of the present disclosure should not be limited by any of the above-described illustrative embodiments.
[0234] It is also understood that any reference to an element herein using a designation such as “first, ” “second, ” and so forth does not generally limit the quantity or order of those elements. Rather, these designations can be used herein as a convenient means of distinguishing between two or more elements or instances of an element. Thus, a reference to first and second elements does not mean that only two elements can be employed, or that the first element must precede the second element in some manner.
[0235] Additionally, a person having ordinary skill in the art would understand that information and signals can be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, and symbols, which may be referenced in the above description, can be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
[0236] A person of ordinary skill in the art would further appreciate that any of the various illustrative logical blocks, modules, processors, means, circuits, methods and functions described in connection with the aspects disclosed herein can be implemented by electronic hardware (e.g., a digital implementation, an analog implementation, or a combination of the two) , firmware, various forms of program or design code incorporating instructions (which can be referred to herein, for convenience, as “software” or a “software module) , or any combination of these techniques. To clearly illustrate this interchangeability of hardware, firmware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware, firmware or software, or a combination of these techniques, depends upon the particular application and design constraints imposed on the overall system. Skilled artisans can implement the described functionality in various ways for each particular application, but such implementation decisions do not cause a departure from the scope of the present disclosure.
[0237] Furthermore, a person of ordinary skill in the art would understand that various illustrative logical blocks, modules, devices, components, and circuits described herein can be implemented within or performed by an integrated circuit (IC) that can include 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, or any combination thereof. The logical blocks, modules, and circuits can further include antennas and / or transceivers to communicate with various components within the network or within the device. A general purpose processor can be a microprocessor, but in the alternative, the processor can be any conventional processor, controller, or state machine. A processor can also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or multiple microprocessors in conjunction with a DSP core, or any other suitable configuration to perform the functions described herein.
[0238] If implemented in software, the functions can be stored as one or multiple instructions or code on a computer-readable medium. Thus, the steps of a method or algorithm disclosed herein can be implemented as software stored on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that can be enabled to transfer a computer program or code from one place to another. A storage media can be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired program code in the form of instructions or data structures and that can be accessed by a computer.
[0239] In this document, the term “module” as used herein, refers to software, firmware, hardware, and any combination of these elements for performing the associated functions described herein. Additionally, for purpose of discussion, the various modules are described as discrete modules; however, as would be apparent to one of ordinary skill in the art, two or more modules may be combined to form a single module that performs the associated functions according to embodiments of the present solution.
[0240] Additionally, memory or other storage, as well as communication components, may be employed in embodiments of the present solution. It will be appreciated that, for clarity purposes, the above description has described embodiments of the present solution with reference to different functional units and processors. However, it will be apparent that any suitable distribution of functionality between different functional units, processing logic elements or domains may be used without detracting from the present solution. For example, functionality illustrated to be performed by separate processing logic elements, or controllers, may be performed by the same processing logic element, or controller. Hence, references to specific functional units are only references to a suitable means for providing the described functionality, rather than indicative of a strict logical or physical structure or organization.
[0241] Various modifications to the embodiments described in this disclosure will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the scope of this disclosure. Thus, the disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the novel features and principles disclosed herein, as recited in the claims below.
[0242] Furthermore, the described features, advantages, and characteristics of the present solution may be combined in any suitable manner in one or more embodiments, for non-limiting examples, a portion from one or more embodiments may be combined with another portion of other embodiments. One of ordinary skill in the relevant art will recognize, in light of the description herein, that the present solution can be practiced without one or more of the specific features or advantages of a particular embodiment. In other instances, additional features and advantages may be recognized in certain embodiments that may not be present in all embodiments of the present solution.
Claims
1.A wireless communication method, comprising:receiving, by a wireless communication device from a wireless communication node, configurations of one or more low-power wake-up signal (LP-WUS) parameters; andmonitoring, by the wireless communication device, based on the configurations of the one or more LP-WUS parameters, a plurality of LP-WUS signals during an inactive period of a connected state DRX (C-DRX) cycle.2.The wireless communication method of claim 1, wherein the LP-WUS parameters comprise at least one of: LP_WUS-periodicity, LPWUS-StartOffset, referenceSFN, or referenceSubFrame, and wherein the LP_WUS-periodicity represents a periodicity of the plurality of LP-WUS signals, the LPWUS-StartOffset represents a time offset to determine monitoring occasions of the plurality of LP-WUS signals, the referenceSFN represents an SFN to start a drx-OnDurationTimer, and the referenceSubFram represents a SubFrame to start the drx-OnDurationTimer.3.The wireless communication method of claim 2, further comprising:monitoring, by the wireless communication device, the plurality of LP-WUS signals at subframes determined based on the LP_WUS-periodicity and LPWUS-StartOffset.4.The wireless communication method of claim 2, further comprising:monitoring, by the wireless communication device, the plurality of LP-WUS signals at subframes determined based on the LP_WUS-periodicity, referenceSFN, and referenceSubFrame.5.The wireless communication method of claim 2, further comprising:monitoring, by the wireless communication device, the plurality of LP-WUS signals before subframes are determined based on the LP_WUS-periodicity and LPWUS-StartOffset;wherein the LP_WUS-periodicity is configured as a non-integer number.6.The wireless communication method of claim 2, further comprising:monitoring, by the wireless communication device, the plurality of LP-WUS signals before subframes are determined based on the LP_WUS-periodicity and LPWUS-StartOffset;wherein the LP_WUS-periodicity is configured as an integer number.7.The wireless communication method of claim 2, further comprising:monitoring, by the wireless communication device, the plurality of LP-WUS signals at subframes determined based on the LP_WUS-periodicity and UE_ID.8.The wireless communication method of any of claims 3 to 7, further comprising:in response to detecting one of the LP-WUS signals at a corresponding subframe, starting the drx-OnDurationTimer to monitor a PDCCH from the subframe plus a time offset.9.A wireless communication method, comprising:sending, by a wireless communication node to a wireless communication device, configurations of one or more low-power wake-up signal (LP-WUS) parameters;wherein, during an inactive period of a connected state DRX (C-DRX) cycle, the wireless communication device is configured to monitor, based on the configurations of the one or more LP-WUS parameters, a plurality of LP-WUS signals.10.A wireless communication method, comprising:receiving, by a wireless communication device from a wireless communication node, configurations of one or more low-power wake-up signal (LP-WUS) parameters in system information; andmonitoring, by the wireless communication device, based on the configurations of the one or more LP-WUS parameters, a plurality of LP-WUS signals, when configured in a non-RRC_CONNECTED state.11.The wireless communication method of claim 10, further comprising:upon identifying that a paging early indication (PEI) monitoring condition is met, monitoring, by the wireless communication device, the LP-WUS signals before a PEI corresponding to the PEI monitoring condition with a time offset.12.The wireless communication method of claim 10, further comprising:upon identifying that a paging early indication (PEI) monitoring condition is not met, monitoring, by the wireless communication device, the LP-WUS signals paging occasion with a time offset.13.The wireless communication method of claim 11 or 12, further comprising:upon identifying that a core network-assigned LP-WUS subgrouping is provided, monitoring, by the wireless communication device, the LP-WUS subgroup assigned by the core network.14.The wireless communication method of claim 11 or 12, further comprising:upon identifying that no core network-assigned LP-WUS subgrouping is provided, monitoring, by the wireless communication device, LP-WUS subgroup decided based on UE identity.15.The wireless communication method of claim 14, wherein the subgroup IDs are determined based on at least one of: a number of total paging frames in a paging cycle, a number of paging occasions for a PF, UE_ID, UE_ID_H, subgroupsNumForUEIDofPEI, subgroupsNumForUEIDofLPWUS, or subgroupsStartNoForUEIDofLPWUS, and wherein the UE_ID represents at least one of the UE identity or partial bits of the UE identity, the UE_ID_H represents at least one of a hashed UE identity or partial bits of the hashed UE identity, the subgroupsNumForUEIDofPEI represents a number of PEI subgroups for UE_ID based subgrouping in a PO, the subgroupsNumForUEIDofLPWUS represents a number of LP_WUS subgroups for UE_ID based subgrouping in a PO, the subgroupsStartNoForUEIDofLPWUS represents a starting number of LP_WUS subgroups for UE_ID based subgrouping in a PO.16.A wireless communication method, comprising:sending, by a wireless communication node to a wireless communication device, configurations of one or more low-power wake-up signal (LP-WUS) parameters in system information;wherein, when configured in a non-RRC_CONNECTED state, the wireless communication device is configured to monitor, based on the configurations of the one or more LP-WUS parameters, a plurality of LP-WUS signals.17.A non-transitory computer readable medium storing instructions, which when executed by at least one processor, cause the at least one processor to perform the method of any one of claims 1-16.18.An apparatus comprising:at least one processor configured to perform the method of any one of claims 1-16.
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