Low-power wake-up signal configuration and management in wireless communication systems
The introduction of a low-power wake-up signal in 5G networks addresses battery life and latency issues by optimizing radio resource management, reducing power consumption and extending battery life in critical applications.
Patent Information
- Application Number
- PCT/CN2024/084787
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-03-29
- Publication Date
- 2025-07-31
AI Technical Summary
5G devices face challenges in balancing battery life and latency requirements, with existing methods like Extended Discontinuous Reception (eDRX) leading to high latency and inefficient power consumption, especially in critical use cases such as fire detection.
Implementation of a low-power wake-up signal (LP-WUS) using an on-off keying modulated waveform with orthogonal frequency division multiplexing, allowing for efficient radio resource management and reduced power consumption by triggering main radio monitoring only when necessary.
LP-WUS enables significant power savings in 5G devices by minimizing unnecessary radio monitoring, extending battery life while maintaining low latency, suitable for latency-critical applications.
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Figure CN2024084787_31072025_PF_FP_ABST
Abstract
Description
LOW-POWER WAKE-UP SIGNAL CONFIGURATION AND MANAGEMENT IN WIRELESS COMMUNICATION SYSTEMSTECHNICAL FIELD
[0001] This disclosure is directed generally to digital wireless communications.BACKGROUND
[0002] Mobile telecommunication technologies are moving the world toward an increasingly connected and networked society. In comparison with the existing wireless networks, next generation systems and wireless communication techniques will need to support a much wider range of use-case characteristics and provide a more complex and sophisticated range of access requirements and flexibilities.
[0003] Long-Term Evolution (LTE) is a standard for wireless communication for mobile devices and data terminals developed by 3rd Generation Partnership Project (3GPP) . LTE Advanced (LTE-A) is a wireless communication standard that enhances the LTE standard. The 5th generation of wireless system, known as 5G, advances the LTE and LTE-A wireless standards and is committed to supporting higher data-rates, large number of connections, ultra-low latency, high reliability and other emerging business needs.SUMMARY
[0004] Techniques are disclosed for configuration and management of a low-power wake-up signal (LP-WUS) in New Radio (NR) and emerging cellular communication networks. The described embodiments provide, for example, configuration and management of the LP-WUS (both with and without connected-mode discontinuous reception (C-DRX) being configured) and relaxation of radio resource management (RRM) measurements using the LP-WUS, which advantageously improve networked communications.
[0005] In an example aspect, a wireless communication method includes receiving, by a wireless device from a network node, a configuration information for a low-power wake-up signal, and performing, based on the configuration information, a subsequent communication.
[0006] In another example aspect, a wireless communication method includes transmitting, by a network node to a wireless device, a configuration information for a low-power wake-up signal.
[0007] In yet another example aspect, a wireless communication method includes receiving, by a wireless device from a network node, a message comprising a plurality of parameters for radio resource management (RRM) measurements, and performing, based on the message, the RRM measurements. In this example, the message is a wireless device-specific signaling, and the plurality of parameters comprises at least one of a low-power synchronization signal (LP-SS) quality threshold, a main radio (MR) synchronization signal block (SSB) quality threshold, an LP-SS quality change threshold, an MR SSB quality change threshold, a time duration for evaluating an LP-SS quality change, and / or a time duration for evaluating an MR SSB quality change.
[0008] In yet another example aspect, a wireless communication method includes transmitting, by a network node to a wireless device, a message comprising a plurality of parameters for radio resource management (RRM) measurements. In this example, the message is a wireless device-specific signaling, and the plurality of parameters comprises at least one of a low-power synchronization signal (LP-SS) quality threshold, a main radio (MR) synchronization signal block (SSB) quality threshold, an LP-SS quality change threshold, an MR SSB quality change threshold, a time duration for evaluating an LP-SS quality change, and / or a time duration for evaluating an MR SSB quality change.
[0009] In yet another example aspect, the above-described methods are embodied in the form of processor-executable code and stored in a non-transitory computer-readable storage medium. The code included in the computer readable storage medium when executed by a processor, causes the processor to implement the methods described in this patent document.
[0010] In yet another example aspect, a device that is configured or operable to perform the above-described methods is disclosed.
[0011] The above and other aspects and their implementations are described in greater detail in the drawings, the descriptions, and the claims.
[0012] BRIEF DESCRIPTION OF THE DRAWING
[0013] FIGS. 1–4 show flowcharts of example wireless communication methods.
[0014] FIG. 5 shows a block diagram of an example hardware platform that may be a part of a network device or a communication device.
[0015] FIG. 6 shows an example of wireless communication including a base station (BS) and user equipment (UE) based on some implementations of the disclosed technology.DETAILED DESCRIPTION
[0016] UE energy efficiency is critical to wireless communication. Currently, 5G devices may have to be recharged per week or day, depending on an individual’s usage. In general, 5G devices consume tens of milliwatts in the RRC idle / inactive state and hundreds of milliwatts in the RRC connected state. Designs to prolong the battery life is a necessity for improving energy efficiency as well as for providing a better user experience.
[0017] The power consumption depends, for example, on the configured length of wake-up periods, e.g., the paging cycle. To meet the battery life requirements above, a long Extended Discontinuous Reception (eDRX) cycle may be used, but this results in high latency, which is not suitable for services with both long battery life and low latency requirements. For example, in fire detection and mitigation, fire shutters are configured to be closed and fire sprinklers to be turned on by the actuators within 1 to 2 seconds of the fire being detected by sensors, and long eDRX cycles cannot meet the delay requirements. Thus, eDRX is not suitable for latency-critical use cases. An alternative is the low-power wake up signal and receiver (LP-WUS / WUR) , which has been studied for New Radio (NR) . For example, LP-WUS / WUR is implemented in a power efficient radio module, and uses an on-off keying (OOK) modulated waveform with (or without) overlaid orthogonal frequency division multiplexing (OFDM) sequence (s) over the OOK symbols for the UE wake up signal. The UE consumes significantly less power when monitoring LP-WUS / WUR as compared to monitoring the paging early indication (PEI) , paging, and / or the Physical Downlink Control Channel (PDCCH) using the main radio (MR) . In some implementations, the LP-WUS / WUR can be used to trigger UE MR PDCCH monitoring time when necessary. The LP-WUS discussed in this patent document is further detailed in relevant 3GPP technical specifications, e.g., 3GPP TR 38.869 (V0.3.0, 2023-08; or V18.0.0, 2024-01) , which discusses the waveform characteristics and power models for LP-WUS.
[0018] Embodiments of the disclosed technology provide methods and systems for the configuration and management of a low-power wake-up signal (LP-WUS) in New Radio (NR) and emerging cellular communication networks.
[0019] The example headings for the various sections below are used to facilitate the understanding of the disclosed subject matter and do not limit the scope of the claimed subject matter in any way. Accordingly, one or more features of one example section can be combined with one or more features of another example section. Furthermore, 5G terminology is used for the sake of clarity of explanation, but the techniques disclosed in the present document are not limited to 5G technology only, and may be used in wireless systems that implemented other protocols.
[0020] 1 Examples of LP-WUS monitoring occasion configuration and management
[0021] In some embodiments, and to support low-power wake-up signal (LP-WUS) monitoring by a wirless device (e.g., user equipment (UE) ) in RRC_IDLE and / or RRC_INACTIVE state, the following parameters are configured by the network:
[0022] – LP-WUS time-domain information, which is used to determine the time for monitoring the LP-WUS.
[0023] – LP-WUS monitoring duration, which indicates the maximum duration (e.g., one or more slots) or the maximum number of LP-WUS occasions (e.g., one or more slots, or one or more symbols) that the UE should monitor LP-WUS. This parameter is used to account for any LP-WUS that are lost due to time synchronization errors between the low-power (LP) radio and the main radio (MR) . The UE monitors the LP-WUS during the LP-WUS monitoring duration, and stops to monitor when either (a) the LP-WUS monitoring duration ends or (b) a LP-WUS for the UE is received during the LP-WUS monitoring duration, whichever is earlier.
[0024] – LP-WUS maximum group number, which indicates the total number of LP-WUS groups per paging occasion (PO) or per paging early indication (PEI) . In some examples, the LP-WUS group index is an integer ranging from 0 to (LP-WUS maximum group number –1) , which is explicitly configured by network, implicitly indicated by network (e.g., it equals the LP-WUS resource number × LP-WUS group number per LP-WUS resource) , or predefined in a standard or specification.
[0025] In some embodiments, the LP-WUS time-domain information includes at least one of the following parameters:
[0026] – LP-WUS time offset relative to a paging occasion (PO) ,
[0027] – LP-WUS time offset relative to a specific PEI, if the PEI monitoring condition is satisfied for the UE, and / or
[0028] – LP-WUS periodicity and start time offset. In some examples, the start time offset is timeStartOffset, e.g., subframeStartOffset or slotStartOffset.
[0029] 1.1 LP-WUS time offset relative to a PO
[0030] In some embodiments, the time offset is used to determine the actual LP-WUS monitoring start occasion as follows:
[0031] LP-WUS monitoring start occasion = PO –time offset
[0032] – LP-WUS monitoring duration,
[0033] Herein, PO is the slot start occasion of the paging occasion, time offset is the length of time between the end of the maximum LP-WUS monitoring duration and the PO, and LP-WUS monitoring duration is the maximum time that the UE should monitor LP-WUS, which may be configured by the network or predefined in a specification or standard. It is noted that the above computation accounts for the fact that the resulting System Frame Number (SFN) or Hyper-SFN (H-SFN) may wrap around (or rollover) due to the computation.
[0034] In some embodiments, if eDRX is used, the UE only monitors the LP-WUS associated with the PO in the Paging Time Window (PTW) . If the UE misses the LP-WUS occasion, it monitors the PO for paging directly.
[0035] In some embodiments, the UE determines the LP-WUS group index (that ranges from 0 to LP-WUS group number) to be monitored based on one of the following:
[0036] LP-WUS group index = floor (UE-ID / (N×Ns) ) mod LP-WUS group number or
[0037] LP-WUS group index = floor (UE-ID / (N×Ns) ) mod UE-ID-based LP-WUS group number + X
[0038] Herein, N is the total number of paging frames in one paging Discontinuous Reception (DRX) cycle (with a T msec period) , Ns is the number of paging occasions for a paging frame (PF) , the LP-WUS group number is the maximum LP-WUS group number per PO (paging occasion) , the UE-ID-based LP-WUS group number is the maximum LP-WUS group number per PO that is used for LP-WUS group index determination based on the UE-ID, and X is an integer indicative of the maximum LP-WUS group number per PO used for LP-WUS group index determination based on a service group or a core network (CN) -assigned LP-WUS group.
[0039] 1.2 LP-WUS time offset relative to a specific PEI
[0040] In some embodiments, the time offset is used to determine the actual LP-WUS monitoring start occasion as follows:
[0041] LP-WUS monitoring start occasion = PEI-O –time offset–LP-WUS monitoring duration,
[0042] Herein, PEI-O is the slot start occasion of the UE’s paging early indication (PEI) , time offset is the length of time between the end of the maximum LP-WUS monitoring duration and the PEI-O, and LP-WUS monitoring duration is the maximum time that the UE should monitor LP-WUS, which may be configured by the network or predefined in a specification or standard. It is noted that this computation accounts for the fact that the resulting System Frame Number (SFN) or Hyper-SFN (H-SFN) may wrap around (or rollover) due to the computation.
[0043] In some embodiments, if eDRX is used, the UE only monitors the LP-WUS associated with the PEI. If the UE misses the LP-WUS occasion, it monitors the PEI and PO for paging directly.
[0044] In some embodiments, the UE determines the LP-WUS group index (that ranges from 0 to LP-WUS group number) to be monitored based on one of the following:
[0045] LP-WUS group index = floor (UE-ID / (N×Ns×peiSubgroupsNumPerPO) ) mod LP-WUS group number
[0046] or
[0047] LP-WUS group index = floor (UE-ID / (N×Ns×peiSubgroupsNumPerPO) ) mod UE-ID-based LP-WUS group number + X
[0048] Herein, N is the total number of paging frames in one paging Discontinuous Reception (DRX) cycle (with a T msec period) , which is the DRX cycle of the RRC_IDLE state, Ns is the number of paging occasions for a paging frame (PF) , peiSubgroupsNumPerPO is the total number of PEI subgroups, e.g., for both subgroups assigned by the core network (if any) and any UE-ID-based subgroups (if any) in a paging occasion (PO) , and which is broadcasted in system information, the LP-WUS group number is the maximum LP-WUS group number per PO (paging occasion) , the UE-ID-based LP-WUS group number is the maximum LP-WUS group number per PO that is used for LP-WUS group index determination based on UE-ID, and X is an integer indicative of the maximum LP-WUS group number per PO used for LP-WUS group index determination based on a service group or a CN-assigned LP-WUS group.
[0049] In some embodiments, the LP-WUS group index is indicated by a LP-WUS frequency index and / or bitmap value carried in the LP-WUS. In some examples, if only one LP-WUS frequency is used, the first bit in the bitmap carried in the LP-WUS indicates that LP-WUS group index is 0, the second bit indicates that LP-WUS group index is 1, and so on. In other examples, if multiple LP-WUS frequencies are used, the Nth bit in the bitmap carried in the LP-WUS with frequency index M indicates that LP-WUS group index is (M–1) × (maximum LP-WUS group number per LP-WUS signal) + (N–1) .
[0050] 1.3 LP-WUS periodicity and subframeStartOffset
[0051] In some embodiments, the actual LP-WUS monitoring start occasion in the SFN and subframe is determined as follows:
[0052] subframeStartOffset = [ (SFN × 10) + subframe number] mod (LP-WUS periodicity)
[0053] Herein, SFN is the System Frame Number, LP-WUS periodicity is configured in units of radio frame number, and the value is a integer factor of 1024, e.g., rf2, rf8, rf16, rf32, rf64, rf128, rf256, etc., subframeStartOffset is configured in units of sub frame number, and its value ranges from 0 to ( (maximum subframes in one radio frame) –1) , and the monitoring duration is configured by the network or predefined in a standard or specification.
[0054] In some embodiments, the UE determines the LP-WUS group index (that ranges from 0 to LP-WUS group number) to be monitored based on one of the following:
[0055] LP-WUS group index = UE-ID mod LP-WUS Group number
[0056] or
[0057] LP-WUS group index = UE-ID mod UE-ID based LP-WUS Group number + X
[0058] Herein, the LP-WUS group number is the maximum LP-WUS group number per PO (paging occasion) , the UE-ID-based LP-WUS group number is the maximum LP-WUS group number per PO that is used for LP-WUS group index determination based on the UE-ID, and X is an integer indicative of the maximum LP-WUS group number per PO used for LP-WUS group index determination based on a service group or a CN-assigned LP-WUS group.
[0059] In some embodiments, when the UE monitors its LP-WUS (which may be determined based on UE-ID and LP-WUS group number) , it begins to monitor its latest PEI and / or PO after a predefined time offset.
[0060] 1.4 LP-WUS periodicity and slotStartOffset
[0061] In some embodiments, the actual LP-WUS monitoring start occasion in the SFN and slot is determined as follows: slotStartOffset = [ (SFN × numberOfSlotsPerFrame ) + slot number] mod (LP-WUS periodicity)
[0062] Herein, SFN is the System Frame Number, LP-WUS periodicity is configured in units of radio frame number, and the value is a integer factor of 1024, e.g., rf2, rf8, rf16, rf32, rf64, rf128, rf256, etc., slotStartOffset is configured in units of slot number, and its value ranges from 0 to ( (maximum slots in one radio frame) –1) , and the monitoring duration is configured by the network or predefined in a standard or specification.
[0063] In some embodiments, the UE determines the LP-WUS group index (that ranges from 0 to LP-WUS group number) to be monitored based on one of the following:
[0064] LP-WUS group index = UE-ID mod LP-WUS Group number
[0065] or
[0066] LP-WUS group index = UE-ID mod UE-ID based LP-WUS Group number + X
[0067] Herein, the LP-WUS group number is the maximum LP-WUS group number per PO (paging occasion) , the UE-ID-based LP-WUS group number is the maximum LP-WUS group number per PO that is used for LP-WUS group index determination based on the UE-ID, and X is an integer indicative of the maximum LP-WUS group number per PO used for LP-WUS group index determination based on a service group or a CN-assigned LP-WUS group.
[0068] In some embodiments, when the UE monitors its LP-WUS (which may be determined based on UE-ID and LP-WUS group number) , it begins to monitor its latest PEI and / or PO after a predefined time offset.
[0069] 1.5 LP-WUS and PEI false wakeup issues
[0070] Typically, the LP-WUS group number is larger than the PEI group number, and the LP-WUS false wakeup issue will be not be encountered as often as the PEI false wakeup issue. The disclosed technology provides the following solutions to this problem:
[0071] –The LP-WUS is monitored when a PEI monitoring condition is satisfied (and irrespective of whether the UE is in the last cell or not in the last cell) . In this case, the UE monitors LP-WUS only in the cell in which it monitors the PEI. For example, LP-WUS monitoring is also controlled by the lastUsedCellOnly indication for the PEI. Herein, the UE being in the last cell corresponds to the UE camping in the cell in which it receives the latest RRCRelease message and enters into the RRC_IDLE or RRC_INACTIVE state.
[0072] – The LP-WUS is monitored irrespective of whether the UE is in the last cell (e.g., the cell in which the UE most recently received RRCRelease without noLastCellUpdate) or not in the last cell.
[0073] – Whether the LP-WUS is monitored depends on the lastUsedCellOnly indication for LP-WUS. If the lastUsedCellOnly indication for LP-WUS indicates that LP-WUS is monitored only in the cell in which the UE most recently received RRCRelease without noLastCellUpdate, the UE may monitor LP-WUS in the cell in which the latest received RRCRelease without noLastCellUpdate is received, . Otherwise, the UE does not monitor LP-WUS.
[0074] 2 Examples of relaxation of RRM measurements
[0075] In some embodiments, in order to achieve the UE power saving gain by LP-WUS / WUR, the Radio Resource Management (RRM) measurements on the serving cell and neighboring cell via the main radio (MR) is relaxed or may be stopped when UE is using LP-WUS or MR is in ultra-deep sleep. To relax or stop the RRM measurement via the main radio (MR) on serving cell, LP-SS (Low Power-Synchronization Signal) can be used, which is run in the low-power radio module, and used for time and frequency synchronization and radio condition evaluation.
[0076] To support the main radio RRM measurement relaxation based on LP-WUS, at least one or more of the following parameters is used:
[0077] – LP-SS quality threshold and / or MR Synchronization Signal Block (SSB) quality threshold, which is sent from base station to UE by UE-specific signaling
[0078] – LP-SS quality change threshold and / or MR SSB quality change threshold, which is sent from base station to UE by UE-specific signaling, or predefined by a standard or specification (e.g., a quality change threshold of 3dB)
[0079] – Time duration to evaluate the LP-SS quality change and / or MR SSB quality change, which is sent from base station to UE by UE-specific signaling, or predefined by a standard or specification (e.g., a fixed time of 1 second)
[0080] In some embodiments, before the UE performs main radio RRM measurement relaxation based on LP-SS, the UE performs RRM measurements based on LP-SS and / or MR SSB. If the UE determines that it is in a stationary state and is not at the cell edge (e.g., based on the legacy rules of relaxed measurements for intra-frequency cells, NR inter-frequency cells) and LP-SS based RRM relaxation is activated, the UE may choose to perform relaxed main radio RRM measurements based on LP-SS.
[0081] In some embodiments, while the UE is performing main radio RRM measurement relaxation based on LP-SS, the UE performs RRM measurement based on LP-SS only. If the UE determines that it is not in stationary state or is at the cell edge, the UE perform RRM measurements based on the main radio (e.g., based on MR SSB) .
[0082] In some embodiments, the UE determines it is in stationary state while performing main radio RRM measurement relaxation based on LP-SS, when the following condition is satisfied for at least a time duration:
[0083] (LP-SS quality value –LP-SS quality reference value) ≤ LP-SS quality change threshold
[0084] Herein, LP-SS quality value is the current LP-SS quality value of the serving cell (in dB) , and LP-SS quality reference value is the reference LP-SS value of the serving cell (in dB) . When the UE begins to perform relaxed RRM measurements based on LP-SS (or when the Primary-Synchronization Signal (P-SS) quality reference value is greater than the reference LP-SS value of the serving cell) , the UE sets the value of the LP-SS quality reference value to the current LP-SS quality value of the serving cell.
[0085] In some embodiments, the UE determines it is not at cell edge while performing main radio RRM measurement relaxation based on LP-SS, when the following condition is satisfied:
[0086] LP-SS quality ≥ LP-SS quality threshold
[0087] Herein, LP-SS quality is the current LP-SS measurement value of the serving cell (in dB) , and LP-SS quality threshold is a threshold configured by the base station.
[0088] 3 Examples of LP-WUS monitoring when C-DRX is not configured
[0089] Solution 1. In some embodiments, LP-WUS is configured per bandwidth part (BWP) or per serving cell for a UE in RRC_CONNECTED state by UE-specific signaling, and can be deactivated by default or activated / deactivated by the Medium Access Control (MAC) Control Element (CE) .
[0090] In some embodiments, when LP-WUS is configured and activated per BWP for a UE in RRC_CONNECTED state, the UE starts or restarts an inactiveTimer in the first symbol of the slot immediately after the PDCCH occasion in which a Physical Downlink Control Channel (PDCCH) indicates an uplink (UL) , downlink (DL) or sidelink (SL) transmission, or in the first symbol of the slot immediately after transmission of a Physical Uplink Shared Channel (PUSCH) , or in the first symbol of the slot immediately after the complete reception of a Physical Downlink Shared Channel (PDSCH) . In this example, the inactiveTimer is used to determine whether the UE begins to monitor LP-WUS per BWP, and is configured or reconfigured by UE-specific signaling or predefined in a standard or specification.
[0091] In some embodiments, when the inactiveTimer expires, the UE begins to monitor LP-WUS for the serving cells in a BWP if the LP-WUS is configured per BWP. Alternatively, when the inactiveTimer expires, the UE begins to monitor LP-WUS for the serving cell if the LP-WUS is configured for the serving cell.
[0092] In some embodiments, when Connected-mode Discontinuous Reception (C-DRX) is not configured, the Active Time includes the time while:
[0093] – inactiveTimer is running, or
[0094] – ra-ContentionResolutionTimer or msgB-ResponseWindow is running, or
[0095] – a Scheduling Request is sent on the Physical Uplink Control Channel (PUCCH) and is pending. If this serving cell is part of a non-terrestrial network, the Active Time is started after the Scheduling Request transmission that is performed when the SR_COUNTER is 0 for all the SR configurations with pending SR (s) plus the UE-gNB RTT, or
[0096] – a PDCCH indicating a new transmission addressed to the Cell-Radio Network Temporary Identifier (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, or
[0097] – there is an ongoing (Random Access Channel) RACH-less LTM (L1 / L2-triggered mobility (LTM) ) cell switch, or
[0098] – there is an ongoing RACH-less handover in a terrestrial network.
[0099] In some embodiments, if the LP-WUS is configured per BWP and a UE is in Active Time for serving cells in a BWP, the UE monitors PDCCH on the serving cells in this BWP. Otherwise, the UE does not monitor PDCCH and only monitor LP-WUS on the serving cells in this BWP.
[0100] In some embodiments, if the LP-WUS is configured per serving cell and a UE is in Active Time for a serving cell, the UE monitors PDCCH on the serving cell. Otherwise, the UE does not monitor PDCCH and only monitor LP-WUS on the serving cell.
[0101] Solution 2. In some embodiments, LP-WUS is configured per BWP or per serving cell for UE in RRC_CONNECTED state by UE-specific signaling, and can be deactivated by default or activated / deactivated by MAC CE.
[0102] In some embodiments, when LP-WUS is configured and activated per BWP for a UE in RRC_CONNECTED state, the UE starts or restarts a inactiveTimer in the first symbol of the slot immediately after the PDCCH occasion in which a PDCCH indicates a UL, DL or SL transmission when hybrid automatic repeat request (HARQ) feedback is disabled, or in the first symbol of the slot immediately after transmission of a PUSCH when UL HARQ feedback is disabled, or in the first symbol of the slot immediately after completely reception of a PDSCH when DL HARQ feedback is disabled, or in the first symbol of the slot immediately after the corresponding transmission carrying the DL HARQ feedback, or in the first symbol of the slot immediately after reception of the UL HARQ feedback with an acknowledgement message, or in the first symbol of the slot immediately after the PUSCH transmission.
[0103] In some embodiments, the inactiveTimer is used to determine whether the UE begins to monitor LP-WUS per BWP, and is configured or reconfigured by UE-specific signaling or predefined in a standard or specification.
[0104] In some embodiments, when the inactiveTimer expires, the UE begins to monitor LP-WUS for the serving cells in a BWP if the LP-WUS is configured per BWP.
[0105] In some embodiments, when the inactiveTimer expires, the UE begin to monitor LP-WUS for the serving cell if the LP-WUS is configured for the serving cell.
[0106] In some embodiments, when C-DRX is not configured, the Active Time for Serving Cells in a BWP or in a serving cell includes the time while:
[0107] – inactiveTimer is running, or
[0108] – HARQ Round Trip Time (RTT) timer is running (e.g., during a HARQ procedure) , or
[0109] – retransmission timer is running (e.g. during a retransmission procedure) , or
[0110] – ra-ContentionResolutionTimer or msgB-ResponseWindow is running, or
[0111] – a Scheduling Request is sent on PUCCH and is pending. If this serving cell is part of a non-terrestrial network, the Active Time is started after the Scheduling Request transmission that is performed when the SR_COUNTER is 0 for all the SR configurations with pending SR (s) plus the UE-gNB RTT, or
[0112] – 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, or
[0113] – there is an ongoing RACH-less LTM cell switch, or
[0114] – there is an ongoing RACH-less handover in a terrestrial network.
[0115] In some embodiments, if a UE is in Active Time for serving cells in a BWP, the UE should monitor PDCCH on the serving cells in this BWP. Otherwise, the UE does not monitor PDCCH and only monitor LP-WUS on the Serving Cells in this BWP.
[0116] In some embodiments, if the LP-WUS is configured per BWP and a UE is in Active Time for serving cells in a BWP, the UE monitors PDCCH on the serving cells in this BWP. Otherwise, the UE does not monitor PDCCH and only monitors LP-WUS on the serving cells in this BWP.
[0117] In some embodiments, if the LP-WUS is configured per serving cell and a UE is in Active Time for a serving cell, the UE monitors PDCCH on the serving cell. Otherwise, the UE does not monitor PDCCH and only monitors LP-WUS on the serving cell.
[0118] An example procedure for starting or restarting inactiveTimer defines that when C-DRX is not configured, the Active Time for serving cells in a BWP or in a serving cell includes the times as defined above, and the UE is configured to perform the following:
[0119] 1> if a MAC PDU is received in a configured downlink assignment for unicast:
[0120] 2> if this Serving Cell is configured with downlinkHARQ-FeedbackDisabled:
[0121] 3> if the corresponding HARQ process is configured with HARQ feedback enabled:
[0122] 4> set HARQ-RTT-TimerDL-NTN for the corresponding HARQ process equal to the sum of HARQ-RTT-TimerDL and the latest available UE-gNB RTT value;
[0123] 4> start the HARQ-RTT-TimerDL-NTN for the corresponding HARQ process in the first symbol after the end of the corresponding transmission carrying the DL HARQ feedback.
[0124] 2> else:
[0125] 3> start the HARQ-RTT-TimerDL for the corresponding HARQ process in the first symbol after the end of the corresponding transmission carrying the DL HARQ feedback.
[0126] 2> stop the RetransmissionTimerDL for the corresponding HARQ process;
[0127] 2> stop the RetransmissionTimerDL-PTM for the corresponding HARQ process. 1> if a MAC PDU is transmitted in a configured uplink grant and LBT failure indication is not received from lower layers:
[0128] 2> start inactiveTimer in the first symbol of the slot immediately after the PUSCH transmission.
[0129] 2> if this Serving Cell is configured with uplinkHARQ-Mode:
[0130] 3> if the corresponding HARQ process is configured as HARQModeA:
[0131] 4> set HARQ-RTT-TimerUL-NTN for the corresponding HARQ process equal to the sum of HARQ-RTT-TimerUL and the latest available UE-gNB RTT value;
[0132] 4> if LastTransmissionUL is configured:
[0133] 5> start the HARQ-RTT-TimerUL-NTN for the corresponding HARQ process in the first symbol after the end of the last transmission (within a bundle) of the corresponding PUSCH transmission.
[0134] 4> else:
[0135] 5> start the HARQ-RTT-TimerUL-NTN for the corresponding HARQ process in the first symbol after the end of the first transmission (within a bundle) of the corresponding PUSCH transmission.
[0136] 2> else:
[0137] 3> if disableCG-RetransmissionMonitoring is not configured for the configured uplink grant:
[0138] 4> if LastTransmissionUL is configured:
[0139] 5> start the HARQ-RTT-TimerUL for the corresponding HARQ process in the first symbol after the end of the last transmission (within a bundle) of the corresponding PUSCH transmission.
[0140] 4> else:
[0141] 5> start the HARQ-RTT-TimerUL for the corresponding HARQ process in the first symbol after the end of the first transmission (within a bundle) of the corresponding PUSCH transmission.
[0142] 2> stop the RetransmissionTimerUL for the corresponding HARQ process at the first transmission (within a bundle) of the corresponding PUSCH transmission.
[0143] 1> if a HARQ-RTT-TimerDL expires:
[0144] 2> if the data of the corresponding HARQ process was not successfully decoded:
[0145] 3> start the RetransmissionTimerDL for the corresponding HARQ process in the first symbol after the expiry of HARQ-RTT-TimerDL.
[0146] 1> if a HARQ-RTT-TimerDL-NTN expires:
[0147] 2> if the data of the corresponding HARQ process was not successfully decoded:
[0148] 3> start the RetransmissionTimerDL for the corresponding HARQ process in the first symbol after the expiry of HARQ-RTT-TimerDL-NTN.
[0149] 1> if a HARQ-RTT-TimerUL expires:
[0150] 2> start the RetransmissionTimerUL for the corresponding HARQ process in the first symbol after the expiry of HARQ-RTT-TimerUL.
[0151] 1> if a HARQ-RTT-TimerUL-NTN expires:
[0152] 2> start the RetransmissionTimerUL for the corresponding HARQ process in the first symbol after the expiry of HARQ-RTT-TimerUL-NTN.
[0153] 1> if a HARQ-RTT-TimerSL expires:
[0154] 2> if a HARQ NACK feedback for the corresponding HARQ process is transmitted on PUCCH; or
[0155] 2> if a HARQ NACK feedback for the corresponding HARQ process is generated but not transmitted on PUCCH; or
[0156] 2> if the PUCCH resource is not configured for the SL grant:
[0157] 3> start the RetransmissionTimerSL for the corresponding HARQ process in the first symbol after the expiry of HARQ-RTT-TimerSL.
[0158] 1> if InactivityTimer, RetransmissionTimerDL, RetransmissionTimerUL or RetransmissionTimerSL for a BWP or for a serving cell expires:
[0159] 2>start to monitor LP-WUS for the BWP or for the serving cell .
[0160] 1> if a BWP or serving cell is in Active Time:
[0161] 2> monitor the PDCCH on the Serving Cells in this BWP or on the serving cell;
[0162] 2> if the PDCCH indicates a DL transmission; or
[0163] 2> if the PDCCH indicates a one-shot HARQ feedback as specified; or
[0164] 2> if the PDCCH indicates a retransmission of HARQ feedback:
[0165] 3> if this Serving Cell is configured with downlinkHARQ-FeedbackDisabled:
[0166] 4> if the corresponding HARQ process is configured with HARQ feedback enabled:
[0167] 5> set HARQ-RTT-TimerDL-NTN for the corresponding HARQ process equal to the sum of HARQ-RTT-TimerDL and the latest available UE-gNB RTT value;
[0168] 5> start the HARQ-RTT-TimerDL-NTN for the corresponding HARQ process in the first symbol after the end of the corresponding transmission carrying the DL HARQ feedback.
[0169] 3> else:
[0170] 4> start or restart the HARQ-RTT-TimerDL for the corresponding HARQ process (es) whose HARQ feedback is reported in the first symbol after the end of the corresponding transmission carrying the DL HARQ feedback.
[0171] 3> stop the RetransmissionTimerDL for the corresponding HARQ process (es) whose HARQ feedback is reported;
[0172] 3> stop the RetransmissionTimerDL-PTM for the corresponding HARQ process;
[0173] 3> if the PDSCH-to-HARQ_feedback timing indicate an inapplicable k1 value:
[0174] 4> start the RetransmissionTimerDL in the first symbol after the (end of the last)
[0175] PDSCH transmission (within a bundle) for the corresponding HARQ process.
[0176] 2> if the PDCCH indicates a UL transmission:
[0177] 3> if this Serving Cell is configured with uplinkHARQ-Mode:
[0178] 4> if the corresponding HARQ process is configured as HARQModeA:
[0179] 5> set HARQ-RTT-TimerUL-NTN for the corresponding HARQ process equal to the sum of HARQ-RTT-TimerUL and the latest available UE-gNB RTT value;
[0180] 5> if LastTransmissionUL is configured:
[0181] 6> start the HARQ-RTT-TimerUL-NTN for the corresponding HARQ process in the first symbol after the end of the last transmission (within a bundle) of the corresponding PUSCH transmission.
[0182] 5> else:
[0183] 6> start the HARQ-RTT-TimerUL-NTN for the corresponding HARQ process in the first symbol after the end of the first transmission (within a bundle) of the corresponding PUSCH transmission.
[0184] 3> else:
[0185] 4> if LastTransmissionUL is configured:
[0186] 5> start the HARQ-RTT-TimerUL for the corresponding HARQ process in the first symbol after the end of the last transmission (within a bundle) of the corresponding PUSCH transmission.
[0187] 4> else:
[0188] 5> start the HARQ-RTT-TimerUL for the corresponding HARQ process in the first symbol after the end of the first transmission (within a bundle) of the corresponding PUSCH transmission.
[0189] 3> stop the RetransmissionTimerUL for the corresponding HARQ process.
[0190] 3> start or restart InactivityTimer for BWP or for the serving cell in the first symbol after the end of slot immediately after the PUSCH transmission.
[0191] 2> if a HARQ process receives downlink feedback information and acknowledgement is indicated:
[0192] 3> stop the RetransmissionTimerUL for the corresponding HARQ process.
[0193] 3> start the inactiveTimer in the first symbol of the slot immediately after the reception of the downlink feedback information with acknowledgement.
[0194] 4 Examples of LP-WUS monitoring when C-DRX is configured
[0195] In some embodiments, LP-WUS can be configured for UE in RRC_CONNECTED state by UE-specific signaling, and can be deactivated by default or activated / deactivated by MAC CE.
[0196] In some embodiments, when C-DRX and DCP (i.e., DCI with CRC scrambled by PS-RNT, which is used to control PDCCH monitoring) are configured, a time offset relative to the DCP start occasion is configured or predefined by a standard or specification to determine the LP-WUS occasion. For example, this can be determined as:
[0197] LP-WUS start occasion = DCP start occasion –time offset
[0198] If the UE detects LP-WUS, it begins to monitor the associated DCP on the active BWP. If DCP is detected, it is required to monitor the PDCCH during the next occurrence of the C-DRX on-duration. If the UE does not detect a LP-WUS, it does not monitor the associated DCP. And in this case, the LP-WUS is configured per UE or per BWP.
[0199] In some embodiments, when C-DRX is configured but DCP is not configured, a time offset relative to the drx-onDurationTimer start occasion is configured or predefined by a standard or specification to determine the LP-WUS occasion. For example, this can be determined as:
[0200] LP-WUS start occasion = drx-onDurationTimer start occasion –time offset
[0201] If the UE detects LP-WUS, it begins to monitor the associated PDCCH during the next occurrence of the on-duration. If the UE does not detect a LP-WUS, it does not monitor the PDCCH during the next occurrence of the on-duration. And in this case, the LP-WUS is configured per UE, per DRX group, per BWP, or per serving cell.
[0202] 5 Example methods and implementations of the disclosed technology
[0203] FIG. 1 shows a flowchart for an example wireless communication method 100. The method 100 includes, at operation 110, receiving, by a wireless device from a network node, a configuration information for a low-power wake-up signal.
[0204] The method 100 includes, at operation 120, performing, based on the configuration information, a subsequent communication.
[0205] FIG. 2 shows a flowchart for an example wireless communication method 200. The method 200 includes, at operation 210, transmitting, by a network node to a wireless device, a configuration information for a low-power wake-up signal.
[0206] FIG. 3 shows a flowchart for an example wireless communication method 300. The method 300 includes, at operation 310, receiving, by a wireless device from a network node, a message comprising a plurality of parameters for radio resource management (RRM) measurements.
[0207] The method 300 includes, at operation 320, performing, based on the message, the RRM measurements. In this example, the message is a wireless device-specific signaling, and the plurality of parameters comprises at least one of a low-power synchronization signal (LP-SS) quality threshold, a main radio (MR) synchronization signal block (SSB) quality threshold, an LP-SS quality change threshold, an MR SSB quality change threshold, a time duration for evaluating an LP-SS quality change, and / or a time duration for evaluating an MR SSB quality change.
[0208] FIG. 4 shows a flowchart for an example wireless communication method 400. The method 400 includes, at operation 410, transmitting, by a network node to a wireless device, a message comprising a plurality of parameters for radio resource management (RRM) measurements. In this example, the message is a wireless device-specific signaling, and the plurality of parameters comprises at least one of a low-power synchronization signal (LP-SS) quality threshold, a main radio (MR) synchronization signal block (SSB) quality threshold, an LP-SS quality change threshold, an MR SSB quality change threshold, a time duration for evaluating an LP-SS quality change, and / or a time duration for evaluating an MR SSB quality change.
[0209] The described features can be implemented to further provide one or more of the following technical solutions:
[0210] 1. A wireless communication method, comprising: receiving, by a wireless device from a network node, a configuration information for a low-power wake-up signal; and performing, based on the configuration information, a subsequent communication.
[0211] 2. A wireless communication method, comprising: transmitting, by a network node to a wireless device, a configuration information for a low-power wake-up signal.
[0212] 3. The method of solution 1 or 2, wherein the configuration information comprises at least one of: a time-domain information for a monitoring occasion for the low-power wake-up signal (LP-WUS) , a monitoring duration for the monitoring occasion (duration_MOLP-WUS) , and a maximum group number associated with the monitoring occasion (GNmax, LP WUS or UE-ID-based GNmax, LP-WUS) .
[0213] 4. The method of solution 3, wherein the time-domain information comprises at least one of: a first time offset relative to a paging occasion for the wireless device; a second time offset relative to a specific paging early indication, wherein a monitoring of the specific paging early indication (PEI) is configured for the wireless device; or a periodicity and a start time offset for the low-power wake-up signal.
[0214] 5. The method of solution 4, wherein the periodicity is configured based on a radio frame number, and wherein a value of the periodicity is an integer factor of 1024.
[0215] 6. The method of solution 4, wherein the start time offset comprises a subframe start offset or a slot start offset.
[0216] 7. The method of solution 4, wherein a start of the monitoring occasion for the LP-WUS is determined as: start_MOLP-WUS = PO –the first time offset –duration_MOLP-WUS, wherein: start_MOLP-WUS is the start of the monitoring occasion for the LP-WUS, PO is a slot start for the paging occasion, the first time offset is a duration between an end of a maximum duration of the monitoring occasion for the LP-WUS and the paging occasion, and duration_MOLP-WUS is a duration of the monitoring occasion for the LP-WUS.
[0217] 8. The method of solution 7, wherein an index of an LP-WUS group to be monitored is determined as: floor (UE-ID / (N × Ns ) ) mod GNmax, LP-WUS, or floor (UE-ID / (N × Ns ) ) mod UE-ID-based GNmax, LP-WUS + X, wherein: UE-ID is a numeric identifier of the wireless device, N is a total number of paging frames in one paging discontinuous reception (DRX) cycle, Ns is a number of paging occasions for a paging frame (PF) , GNmax, LP-WUS is a maximum LP-WUS group number per paging occasion, UE-ID-based GNmax, LP-WUS is the maximum LP-WUS group number per paging occasion that is used for LP-WUS group index determination based on the UE-ID, and X is an integer indicative of the maximum LP-WUS group number per paging occasion used for LP-WUS group index determination based on a service group or a core network (CN) -assigned LP-WUS group.
[0218] 9. The method of solution 4, wherein a start of the monitoring occasion for the LP-WUS is determined as: start_MOLP-WUS = PEI-O –the second time offset –duration_MOLP-WUS,wherein: start_MOLP-WUS is the start of the monitoring occasion for the LP-WUS, PEI-O is a slot start for a paging early indication (PEI) occasion, the second time offset is a duration between an end of a maximum duration of the monitoring occasion for the LP-WUS and the PEI occasion, and duration_MOLP-WUS is a duration of the monitoring occasion for the LP-WUS.
[0219] 10. The method of solution 9, wherein an index of an LP-WUS group to be monitored is determined as: floor (UE-ID / (N×Ns×peiSubgroupsNumPerPO) ) mod GNmax, LP-WUS, or floor (UE-ID / (N×Ns×peiSubgroupsNumPerPO) ) mod UE-ID-based GNmax, LP-WUS + X, wherein: UE-ID is a numeric identifier of the wireless device, N is a total number of paging frames in one paging discontinuous reception (DRX) cycle, Ns is a number of paging occasions for a paging frame (PF) , peiSubgroupsNumPerPO is a total number of PEI subgroups in a paging occasion, GNmax, LP-WUS is a maximum LP-WUS group number per paging occasion, and UE-ID-based GNmax, LP-WUS is the maximum LP-WUS group number per paging occasion that corresponds to the wireless device, and X is an integer indicative of the maximum LP-WUS group number per paging occasion used for LP-WUS group index determination based on a service group or a core network (CN) -assigned LP-WUS group.
[0220] 11. The method of solution 10, wherein the total number of PEI subgroups comprises a first number of subgroups assigned by a core network and a second number of subgroups based on the UE-ID, and wherein the total number of PEI subgroups is broadcast in system information.
[0221] 12. The method of solution 10, wherein the maximum group number is indicated by a frequency index of the LP-WUS or a bitmap value carried in the LP-WUS.
[0222] 13. The method of solution 9, wherein the wireless device is configured to monitor the LP-WUS upon determining that the wireless device is in a last cell or not in the last cell.
[0223] 14. The method of solution 9, wherein, when a condition for monitoring a PEI is satisfied in a cell, the wireless device is configured to monitor both the LP-WUS and the PEI in the cell.
[0224] 15. The method of solution 14, wherein monitoring the LP-WUS is based on an indication that indicates whether the wireless device monitors the PEI only in a last cell.
[0225] 16. The method of solution 9, wherein the wireless device is configured to monitor the LP-WUS based on an indication that indicates whether the wireless device monitors LP-WUS only in a last cell.
[0226] 17. The method of solution 15 or 16, wherein the last cell is a cell in which the wireless device most recently received RRCRelease without noLastCellUpdate.
[0227] 18. The method of solution 1 or 2, wherein the low-power wake-up signal (LP-WUS) is configured per bandwidth part (BWP) or per serving cell for the wireless device, wherein the wireless device is configured to: start, in a first symbol of a slot, an inactive timer; and monitor, upon expiration of the inactive timer, the LP-WUS for a serving cell, and wherein, when a connected-mode discontinuous reception (C-DRX) is not configured, an active time includes a duration when the inactive timer is running.
[0228] 19. The method of solution 18, wherein the slot follows: a Physical Downlink Control Channel (PDCCH) occasion in which an uplink (UL) , a downlink (DL) , or a sidelink (SL) transmission is indicated, or a reception of a Physical Downlink Shared Channel (PDSCH) .
[0229] 20. The method of solution 18, wherein the wireless device is configured to monitor the LP-WUS for a serving cell in a BWP when the LP-WUS is configured per BWP, or monitor the LP-WUS for the serving cell when the LP-WUS is configured for the serving cell.
[0230] 21. The method of solution 1 or 2, wherein the low-power wake-up signal (LP-WUS) is configured per bandwidth part (BWP) or per serving cell for the wireless device, wherein the wireless device is configured to: start, in a first symbol of a slot, an inactive timer, and wherein, when a connected-mode discontinuous reception (C-DRX) is not configured, an active time includes a duration when (a) the inactive timer is running, (b) a hybrid automatic repeat request (HARQ) round trip time (RTT) timer is running during a HARQ procedure, or (c) a retransmission timer is running during a retransmission procedure.
[0231] 22. The method of solution 21, wherein the slot follows: a Physical Downlink Control Channel (PDCCH) occasion in which an uplink (UL) , a downlink (DL) , or a sidelink (SL) transmission is indicated when HARQ feedback is disabled, or a transmission of a Physical Uplink Shared Channel (PUSCH) when an uplink (UL) HARQ feedback is disabled, or a reception of a Physical Downlink Shared Channel (PDSCH) when a downlink (DL) HARQ feedback is disabled, or a corresponding transmission carrying the DL HARQ feedback, or a reception of the UL HARQ feedback with an acknowledgement, or the transmission of the PUSCH.
[0232] 23. The method of solution 21, wherein the wireless device is configured to: monitor, upon expiration of the inactive timer or the retransmission timer, the LP-WUS for the BWP or the serving cell.
[0233] 24. The method of solution 1 or 2, wherein, when a connected-mode discontinuous reception (C-DRX) and a downlink control information for power saving (DCP) is configured, a monitoring occasion for the low-power wake-up signal (LP-WUS) is based on a time offset relative to a start occasion of the DCP, and wherein the LP-WUS is configured per wireless device or per bandwidth part (BWP) .
[0234] 25. The method of solution 24, wherein the DCP comprises a downlink control information (DCI) scrambled by a power-saving radio network temporary identifier (PS-RNTI) and is used to control Physical Downlink Control Channel (PDCCH) monitoring.
[0235] 26. The method of solution 1 or 2, wherein, when a connected-mode discontinuous reception (C-DRX) is configured and a downlink control information for power saving (DCP) is not configured, a monitoring occasion for the low-power wake-up signal (LP-WUS) is based on a time offset relative to a start occasion of a DRX timer, and wherein the LP-WUS is configured per wireless device, per DRX group, per bandwidth part (BWP) , or per serving cell.
[0236] 27. The method of solution 26, wherein the DRX timer is a drx-onDurationTimer.
[0237] 28. The method of any of solutions 13 to 27, wherein the LP-WUS can be activated or deactivated by a medium access control (MAC) control element (CE) .
[0238] 29. A wireless communication method, comprising: receiving, by a wireless device from a network node, a message comprising a plurality of parameters for radio resource management (RRM) measurements; and performing, based on the message, the RRM measurements, wherein the message is a wireless device-specific signaling, and wherein the plurality of parameters comprises at least one of: a low-power synchronization signal (LP-SS) quality threshold, a main radio (MR) synchronization signal block (SSB) quality threshold, an LP-SS quality change threshold, an MR SSB quality change threshold, a time duration for evaluating an LP-SS quality change, and / or a time duration for evaluating an MR SSB quality change.
[0239] 30. A wireless communication method, comprising: transmitting, by a network node to a wireless device, a message comprising a plurality of parameters for radio resource management (RRM) measurements, wherein the message is a wireless device-specific signaling, and wherein the plurality of parameters comprises at least one of: a low-power synchronization signal (LP-SS) quality threshold, a main radio (MR) synchronization signal block (SSB) quality threshold, an LP-SS quality change threshold, an MR SSB quality change threshold, a time duration for evaluating an LP-SS quality change, and / or a time duration for evaluating an MR SSB quality change.
[0240] 31. The method of solution 29 or 30, wherein, upon determining that the wireless device is not in a stationary state or at a cell edge, the wireless device is configured to perform the RRM measurements based on an MR SSB.
[0241] 32. The method of solution 29 or 30, wherein, upon determining that the wireless device is in a stationary state or not at a cell edge, the wireless device is configured to perform the RRM measurements based on the LP-SS.
[0242] 33. The method of solution 31 or 32, wherein the wireless device is configured to determine that is in the stationary state when performing the RRM measurements based on the LP-SS when a difference between an LP-SS quality value and an LP-SS quality reference value is less than the LP-SS quality change threshold, wherein the LP-SS quality value is a current LP-SS quality value (in dB) of a serving cell of the wireless device and the LP-SS quality reference value is a reference LP-SS quality value (in dB) of the serving cell.
[0243] 34. The method of solution 33, wherein the LP-SS quality reference value is set to the current LP-SS quality value when (a) the wireless device begins performing the RRM measurements or (b) a primary-SS quality reference value is greater than the reference LP-SS quality value of the serving cell.
[0244] 35. The method of solution 31 or 32, wherein the wireless device is configured to determine that is not at the cell edge when performing the RRM measurements when an LP-SS quality value is greater than the LP-SS quality threshold, wherein the LP-SS quality value is a current LP-SS quality value (in dB) of a serving cell of the wireless device and the LP-SS quality threshold is configured by the network node.
[0245] 36. An apparatus for wireless communication comprising one or more processors, configured to implement the method recited in one or more of solutions 1 to 35.
[0246] 37. A non-transitory computer readable program storage medium having code stored thereon, the code, when executed by a processor, causing the processor to implement the method recited in one or more of solutions 1 to 35.
[0247] FIG. 5 shows a block diagram of an example hardware platform 500 that may be a part of a network device (e.g., base station) or a communication device (e.g., a user equipment (UE) ) . The hardware platform 500 includes at least one processor 510 and a memory 505 having instructions stored thereupon. The instructions upon execution by the processor 510 configure the hardware platform 500 to perform the operations described in FIGS. 1 to 4 and in the various embodiments described in this patent document. The transmitter 515 transmits or sends information or data to another device. For example, a network device transmitter can send a message to a user equipment. The receiver 520 receives information or data transmitted or sent by another device. For example, a user equipment can receive a message from a network device.
[0248] The implementations as discussed above will apply to a wireless communication. FIG. 6 shows an example of a wireless communication system (e.g., a 5G or NR cellular network) that includes a base station 620 and one or more user equipment (UE) 611, 612 and 613. In some embodiments, the UEs access the BS (e.g., the network) using a communication link to the network (sometimes called uplink direction, as depicted by dashed arrows 631, 632, 633) , which then enables subsequent communication (e.g., shown in the direction from the network to the UEs, sometimes called downlink direction, shown by arrows 641, 642, 643) from the BS to the UEs. In some embodiments, the BS send information to the UEs (sometimes called downlink direction, as depicted by arrows 641, 642, 643) , which then enables subsequent communication (e.g., shown in the direction from the UEs to the BS, sometimes called uplink direction, shown by dashed arrows 631, 632, 633) from the UEs to the BS. The UE may be, for example, a smartphone, a tablet, a mobile computer, a machine to machine (M2M) device, an Internet of Things (IoT) device, and so on.
[0249] Some of the embodiments described herein are described in the general context of methods or processes, which may be implemented in one embodiment by a computer program product, embodied in a computer-readable medium, including computer-executable instructions, such as program code, executed by computers in networked environments. A computer-readable medium may include removable and non-removable storage devices including, but not limited to, Read Only Memory (ROM) , Random Access Memory (RAM) , compact discs (CDs) , digital versatile discs (DVD) , etc. Therefore, the computer-readable media can include a non-transitory storage media. Generally, program modules may include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. Computer-or processor-executable instructions, associated data structures, and program modules represent examples of program code for executing steps of the methods disclosed herein. The particular sequence of such executable instructions or associated data structures represents examples of corresponding acts for implementing the functions described in such steps or processes.
[0250] Some of the disclosed embodiments can be implemented as devices or modules using hardware circuits, software, or combinations thereof. For example, a hardware circuit implementation can include discrete analog and / or digital components that are, for example, integrated as part of a printed circuit board. Alternatively, or additionally, the disclosed components or modules can be implemented as an Application Specific Integrated Circuit (ASIC) and / or as a Field Programmable Gate Array (FPGA) device. Some implementations may additionally or alternatively include a digital signal processor (DSP) that is a specialized microprocessor with an architecture optimized for the operational needs of digital signal processing associated with the disclosed functionalities of this application. Similarly, the various components or sub-components within each module may be implemented in software, hardware or firmware. The connectivity between the modules and / or components within the modules may be provided using any one of the connectivity methods and media that is known in the art, including, but not limited to, communications over the Internet, wired, or wireless networks using the appropriate protocols.
[0251] While this document contains many specifics, these should not be construed as limitations on the scope of an invention that is claimed or of what may be claimed, but rather as descriptions of features specific to particular embodiments. Certain features that are described in this document in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable sub-combination. Moreover, although features may be described above as acting in certain combinations and even initially claimed as such, one or more features from a claimed combination can in some cases be excised from the combination, and the claimed combination may be directed to a sub-combination or a variation of a sub-combination. Similarly, while operations are depicted in the drawings in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results.
[0252] Only a few implementations and examples are described and other implementations, enhancements and variations can be made based on what is described and illustrated in this disclosure.
Claims
1.A wireless communication method, comprising:receiving, by a wireless device from a network node, a configuration information for a low-power wake-up signal; andperforming, based on the configuration information, a subsequent communication.2.A wireless communication method, comprising:transmitting, by a network node to a wireless device, a configuration information for a low-power wake-up signal.3.The method of claim 1 or 2, wherein the configuration information comprises at least one of:a time-domain information for a monitoring occasion for the low-power wake-up signal (LP-WUS) ,a monitoring duration for the monitoring occasion (duration_MOLP-WUS) , anda maximum group number associated with the monitoring occasion (GNmax, LP-WUS or UE-ID-based GNmax, LP-WUS) .4.The method of claim 3, wherein the time-domain information comprises at least one of:a first time offset relative to a paging occasion for the wireless device;a second time offset relative to a specific paging early indication, wherein a monitoring of the specific paging early indication (PEI) is configured for the wireless device; ora periodicity and a start time offset for the low-power wake-up signal.5.The method of claim 4, wherein the periodicity is configured based on a radio frame number, and wherein a value of the periodicity is an integer factor of 1024.6.The method of claim 4, wherein the start time offset comprises a subframe start offset or a slot start offset.7.The method of claim 4, wherein a start of the monitoring occasion for the LP-WUS is determined as:start_MOLP-WUS = PO –the first time offset –duration_MOLP-WUS,wherein:start_MOLP-WUS is the start of the monitoring occasion for the LP-WUS,PO is a slot start for the paging occasion,the first time offset is a duration between an end of a maximum duration of the monitoring occasion for the LP-WUS and the paging occasion, andduration_MOLP-WUS is a duration of the monitoring occasion for the LP-WUS.8.The method of claim 7, wherein an index of an LP-WUS group to be monitored is determined as:floor (UE-ID / (N × Ns ) ) mod GNmax, LP-WUS, orfloor (UE-ID / (N × Ns ) ) mod UE-ID-based GNmax, LP-WUS + X,wherein:UE-ID is a numeric identifier of the wireless device,N is a total number of paging frames in one paging discontinuous reception (DRX) cycle,Ns is a number of paging occasions for a paging frame (PF) ,GNmax, LP-WUS is a maximum LP-WUS group number per paging occasion,UE-ID-based GNmax, LP-WUS is the maximum LP-WUS group number per paging occasion that is used for LP-WUS group index determination based on the UE-ID, andX is an integer indicative of the maximum LP-WUS group number per paging occasion used for LP-WUS group index determination based on a service group or a core network (CN) -assigned LP-WUS group.9.The method of claim 4, wherein a start of the monitoring occasion for the LP-WUS is determined as:start_MOLP-WUS = PEI-O –the second time offset –duration_MOLP-WUS,wherein:start_MOLP-WUS is the start of the monitoring occasion for the LP-WUS,PEI-O is a slot start for a paging early indication (PEI) occasion,the second time offset is a duration between an end of a maximum duration of the monitoring occasion for the LP-WUS and the PEI occasion, andduration_MOLP-WUS is a duration of the monitoring occasion for the LP-WUS.10.The method of claim 9, wherein an index of an LP-WUS group to be monitored is determined as:floor (UE-ID / (N×Ns×peiSubgroupsNumPerPO) ) mod GNmax, LP-WUS, orfloor (UE-ID / (N×Ns×peiSubgroupsNumPerPO) ) mod UE-ID-based GNmax, LP-WUS + X,wherein:UE-ID is a numeric identifier of the wireless device,N is a total number of paging frames in one paging discontinuous reception (DRX) cycle,Ns is a number of paging occasions for a paging frame (PF) ,peiSubgroupsNumPerPO is a total number of PEI subgroups in a paging occasion,GNmax, LP-WUS is a maximum LP-WUS group number per paging occasion, andUE-ID-based GNmax, LP-WUS is the maximum LP-WUS group number per paging occasion that corresponds to the wireless device, andX is an integer indicative of the maximum LP-WUS group number per paging occasion used for LP-WUS group index determination based on a service group or a core network (CN) -assigned LP-WUS group.11.The method of claim 10, wherein the total number of PEI subgroups comprises a first number of subgroups assigned by a core network and a second number of subgroups based on the UE-ID, and wherein the total number of PEI subgroups is broadcast in system information.12.The method of claim 10, wherein the maximum group number is indicated by a frequency index of the LP-WUS or a bitmap value carried in the LP-WUS.13.The method of claim 9, wherein the wireless device is configured to monitor the LP-WUS upon determining that the wireless device is in a last cell or not in the last cell.14.The method of claim 9, wherein, when a condition for monitoring a PEI is satisfied in a cell, the wireless device is configured to monitor both the LP-WUS and the PEI in the cell.15.The method of claim 14, wherein monitoring the LP-WUS is based on an indication that indicates whether the wireless device monitors the PEI only in a last cell.16.The method of claim 9, wherein the wireless device is configured to monitor the LP-WUS based on an indication that indicates whether the wireless device monitors LP-WUS only in a last cell.17.The method of claim 15 or 16, wherein the last cell is a cell in which the wireless device most recently received RRCRelease without noLastCellUpdate.18.The method of claim 1 or 2, wherein the low-power wake-up signal (LP-WUS) is configured per bandwidth part (BWP) or per serving cell for the wireless device, wherein the wireless device is configured to:start, in a first symbol of a slot, an inactive timer; andmonitor, upon expiration of the inactive timer, the LP-WUS for a serving cell, andwherein, when a connected-mode discontinuous reception (C-DRX) is not configured, an active time includes a duration when the inactive timer is running.19.The method of claim 18, wherein the slot follows:a Physical Downlink Control Channel (PDCCH) occasion in which an uplink (UL) , a downlink (DL) , or a sidelink (SL) transmission is indicated, ora reception of a Physical Downlink Shared Channel (PDSCH) .20.The method of claim 18, wherein the wireless device is configured to monitor the LP-WUS for a serving cell in a BWP when the LP-WUS is configured per BWP, or monitor the LP-WUS for the serving cell when the LP-WUS is configured for the serving cell.21.The method of claim 1 or 2, wherein the low-power wake-up signal (LP-WUS) is configured per bandwidth part (BWP) or per serving cell for the wireless device, wherein the wireless device is configured to:start, in a first symbol of a slot, an inactive timer, andwherein, when a connected-mode discontinuous reception (C-DRX) is not configured, an active time includes a duration when (a) the inactive timer is running, (b) a hybrid automatic repeat request (HARQ) round trip time (RTT) timer is running during a HARQ procedure, or (c) a retransmission timer is running during a retransmission procedure.22.The method of claim 21, wherein the slot follows:a Physical Downlink Control Channel (PDCCH) occasion in which an uplink (UL) , a downlink (DL) , or a sidelink (SL) transmission is indicated when HARQ feedback is disabled, ora transmission of a Physical Uplink Shared Channel (PUSCH) when an uplink (UL) HARQ feedback is disabled, ora reception of a Physical Downlink Shared Channel (PDSCH) when a downlink (DL) HARQ feedback is disabled, ora corresponding transmission carrying the DL HARQ feedback, ora reception of the UL HARQ feedback with an acknowledgement, orthe transmission of the PUSCH.23.The method of claim 21, wherein the wireless device is configured to:monitor, upon expiration of the inactive timer or the retransmission timer, the LP-WUS for the BWP or the serving cell.24.The method of claim 1 or 2, wherein, when a connected-mode discontinuous reception (C-DRX) and a downlink control information for power saving (DCP) is configured, a monitoring occasion for the low-power wake-up signal (LP-WUS) is based on a time offset relative to a start occasion of the DCP, and wherein the LP-WUS is configured per wireless device or per bandwidth part (BWP) .25.The method of claim 24, wherein the DCP comprises a downlink control information (DCI) scrambled by a power-saving radio network temporary identifier (PS-RNTI) and is used to control Physical Downlink Control Channel (PDCCH) monitoring.26.The method of claim 1 or 2, wherein, when a connected-mode discontinuous reception (C-DRX) is configured and a downlink control information for power saving (DCP) is not configured, a monitoring occasion for the low-power wake-up signal (LP-WUS) is based on a time offset relative to a start occasion of a DRX timer, and wherein the LP-WUS is configured per wireless device, per DRX group, per bandwidth part (BWP) , or per serving cell.27.The method of claim 26, wherein the DRX timer is a drx-onDurationTimer.28.The method of any of claims 13 to 27, wherein the LP-WUS can be activated or deactivated by a medium access control (MAC) control element (CE) .29.A wireless communication method, comprising:receiving, by a wireless device from a network node, a message comprising a plurality of parameters for radio resource management (RRM) measurements; andperforming, based on the message, the RRM measurements,wherein the message is a wireless device-specific signaling, and wherein the plurality of parameters comprises at least one of:a low-power synchronization signal (LP-SS) quality threshold,a main radio (MR) synchronization signal block (SSB) quality threshold,an LP-SS quality change threshold,an MR SSB quality change threshold,a time duration for evaluating an LP-SS quality change, and / ora time duration for evaluating an MR SSB quality change.30.A wireless communication method, comprising:transmitting, by a network node to a wireless device, a message comprising a plurality of parameters for radio resource management (RRM) measurements,wherein the message is a wireless device-specific signaling, and wherein the plurality of parameters comprises at least one of:a low-power synchronization signal (LP-SS) quality threshold,a main radio (MR) synchronization signal block (SSB) quality threshold,an LP-SS quality change threshold,an MR SSB quality change threshold,a time duration for evaluating an LP-SS quality change, and / ora time duration for evaluating an MR SSB quality change.31.The method of claim 29 or 30, wherein, upon determining that the wireless device is not in a stationary state or at a cell edge, the wireless device is configured to perform the RRM measurements based on an MR SSB.32.The method of claim 29 or 30, wherein, upon determining that the wireless device is in a stationary state or not at a cell edge, the wireless device is configured to perform the RRM measurements based on the LP-SS.33.The method of claim 31 or 32, wherein the wireless device is configured to determine that is in the stationary state when performing the RRM measurements based on the LP-SS when a difference between an LP-SS quality value and an LP-SS quality reference value is less than the LP-SS quality change threshold, wherein the LP-SS quality value is a current LP-SS quality value (in dB) of a serving cell of the wireless device and the LP-SS quality reference value is a reference LP-SS quality value (in dB) of the serving cell.34.The method of claim 33, wherein the LP-SS quality reference value is set to the current LP-SS quality value when (a) the wireless device begins performing the RRM measurements or (b) a primary-SS quality reference value is greater than the reference LP-SS quality value of the serving cell.35.The method of claim 31 or 32, wherein the wireless device is configured to determine that is not at the cell edge when performing the RRM measurements when an LP-SS quality value is greater than the LP-SS quality threshold, wherein the LP-SS quality value is a current LP-SS quality value (in dB) of a serving cell of the wireless device and the LP-SS quality threshold is configured by the network node.36.An apparatus for wireless communication comprising one or more processors, configured to implement the method recited in one or more of claims 1 to 35.37.A non-transitory computer readable program storage medium having code stored thereon, the code, when executed by a processor, causing the processor to implement the method recited in one or more of claims 1 to 35.
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