Systems and methods for reducing misalignment between network and user equipment regarding low-power wake-up signal monitoring at the user equipment
Synchronized LP-WUS monitoring mechanisms address misalignment issues between network and UE, reducing power consumption and enhancing system efficiency through ACK signaling and timer-based corrections.
Patent Information
- Application Number
- PCT/CN2024/092335
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-05-10
- Publication Date
- 2025-11-13
AI Technical Summary
Existing wireless communication systems face misalignment between network and user equipment regarding low-power wake-up signal monitoring, leading to unnecessary power consumption and inefficiencies due to unsynchronized understanding of UE states.
Implement mechanisms for synchronized LP-WUS monitoring status between the network and UE, including ACK signaling, multiple monitoring occasions, timer-based behaviors, and extended LP-WUS monitoring to correct and prevent misalignment, ensuring accurate UE and network alignment.
Reduces power consumption and improves system efficiency by minimizing misalignment and ensuring synchronized LP-WUS monitoring, thereby optimizing power usage and communication efficiency.
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Figure CN2024092335_13112025_PF_FP_ABST
Abstract
Description
SYSTEMS AND METHODS FOR REDUCING MISALIGNMENT BETWEEN NETWORK AND USER EQUIPMENT REGARDING LOW-POWER WAKE-UP SIGNAL MONITORING AT THE USER EQUIPMENTTECHNICAL FIELD
[0001] This application relates generally to wireless communication systems, including wireless communication systems configured for low-power wake-up signal (LP-WUS) operation.BACKGROUND
[0002] Wireless mobile communication technology uses various standards and protocols to transmit data between a base station and a wireless communication device. Wireless communication system standards and protocols can include, for example, 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) (e.g., 4G) , 3GPP New Radio (NR) (e.g., 5G) , and Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard for Wireless Local Area Networks (WLAN) (commonly known to industry groups as ) .
[0003] As contemplated by the 3GPP, different wireless communication systems' standards and protocols can use various radio access networks (RANs) for communicating between a base station of the RAN (which may also sometimes be referred to generally as a RAN node, a network node, or simply a node) and a wireless communication device known as a user equipment (UE) . 3GPP RANs can include, for example, Global System for Mobile communications (GSM) , Enhanced Data Rates for GSM Evolution (EDGE) RAN (GERAN) , Universal Terrestrial Radio Access Network (UTRAN) , Evolved Universal Terrestrial Radio Access Network (E-UTRAN) , and / or Next-Generation Radio Access Network (NG-RAN) .
[0004] Each RAN may use one or more radio access technologies (RATs) to perform communication between the base station and the UE. For example, the GERAN implements GSM and / or EDGE RAT, the UTRAN implements Universal Mobile Telecommunication System (UMTS) RAT or other 3GPP RAT, the E-UTRAN implements LTE RAT (sometimes simply referred to as LTE) , and NG-RAN implements NR RAT (sometimes referred to herein as 5G RAT, 5G NR RAT, or simply NR) . In certain deployments, the E-UTRAN may also implement NR RAT. In certain deployments, NG-RAN may also implement LTE RAT.
[0005] A base station used by a RAN may correspond to that RAN. One example of an E-UTRAN base station is an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) Node B (also commonly denoted as evolved Node B, enhanced Node B, eNodeB, or eNB) . One example of an NG-RAN base station is a next generation Node B (also sometimes referred to as a g Node B or gNB) .
[0006] A RAN provides its communication services with external entities through its connection to a core network (CN) . For example, E-UTRAN may utilize an Evolved Packet Core (EPC) while NG-RAN may utilize a 5G Core Network (5GC) .
[0007] Frequency bands for 5G NR may be separated into two or more different frequency ranges. For example, Frequency Range 1 (FR1) may include frequency bands operating in sub-6 gigahertz (GHz) frequencies, some of which are bands that may be used by previous standards, and may potentially be extended to cover new spectrum offerings from 410 megahertz (MHz) to 7125 MHz. Frequency Range 2 (FR2) may include frequency bands from 24.25 GHz to 52.6 GHz. Note that in some systems, FR2 may also include frequency bands from 52.6 GHz to 71 GHz (or beyond) . Bands in the millimeter wave (mmWave) range of FR2 may have smaller coverage but potentially higher available bandwidth than bands in FR1. Skilled persons will recognize these frequency ranges, which are provided by way of example, may change from time to time or from region to region.
[0008] BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
[0009] To easily identify the discussion of any particular element or act, the most significant digit or digits in a reference number refer to the figure number in which that element is first introduced.
[0010] FIG. 1 illustrates a diagram showing a procedure for ensuring that the LP-WUS monitoring status at a UE is synchronized between the UE and a network.
[0011] FIG. 2 illustrates a diagram for a first example for the use of multiple LP-WUS monitoring occasions, according to embodiments herein.
[0012] FIG. 3 illustrates a diagram for a second example for the use of multiple LP-WUS monitoring occasions, according to embodiments herein.
[0013] FIG. 4 illustrates a diagram for the use of a PDCCH monitoring timer to correct an alignment between the UE and the network when the network incorrectly thinks that the UE is performing LP-WUS monitoring, according to embodiments disclosed herein.
[0014] FIG. 5 illustrates a method of a UE, according to embodiments discussed herein.
[0015] FIG. 6 illustrates a method of a base station, according to embodiments discussed herein
[0016] FIG. 7 illustrates a method of a base station, according to embodiments discussed herein.
[0017] FIG. 8 illustrates a method of a first UE, according to embodiments discussed herein.
[0018] FIG. 9 illustrates a method of a base station, according to embodiments discussed herein.
[0019] FIG. 10 illustrates a method of a UE, according to embodiments discussed herein.
[0020] FIG. 11 illustrates a method of a UE, according to embodiments discussed herein.
[0021] FIG. 12 illustrates an example architecture of a wireless communication system, according to embodiments disclosed herein.
[0022] FIG. 13 illustrates a system for performing signaling between a wireless device and a network device, according to embodiments disclosed herein.DETAILED DESCRIPTION
[0023] Various embodiments are described with regard to a UE. However, reference to a UE is merely provided for illustrative purposes. The example embodiments may be utilized with any electronic component that may establish a connection to a network and is configured with the hardware, software, and / or firmware to exchange information and data with the network. Therefore, the UE as described herein is used to represent any appropriate electronic component.
[0024] In various existing wireless communication systems, UEs do not constantly monitor their active carriers during all time units. Rather, UEs are configured to operate in a discontinuous reception (DRX) mode, where the UE periodically wakes up at defined times according to a DRX cycle known to the UE and the network (e.g., once per a DRX cycle) in order to check for paging messages from the network that, if present, inform the UE of an upcoming scheduled communication task. If no paging message is present, the UE returns to sleep until the next wake up instance of the DRX cycle.
[0025] The power used by the UE to wake up / to check for paging messages according such DRX cycling during instances where there is no signaling or data traffic to schedule between the UE and the network is accordingly “wasted” (e.g., is not used corresponding to any communication that is affirmatively scheduled / occurring between the UE and the base station) .
[0026] It follows that if the UE were able to wake up only upon being triggered (e.g., corresponding to actually existing paging) , overall power consumption of the UE could be dramatically reduced. This goal can be approached through the use of a low-power wake-up signal (LP-WUS) mechanism. Within such a mechanism, a low-power receiver (LR) of a UE that uses relatively low power consumption monitors for a LP-WUS from the network. In some such cases, detection of such a LP-WUS by the LR then triggers the UE to wake a main radio (MR) of the UE (that uses a relatively higher power consumption) and to use the MR to perform any associated communication with the network. In other such cases, detection of such an LP-WUS that includes an indication to wake the MR (as opposed to, e.g., an LP-WUS including an indication not to wake the MR, or no detection of a LP-WUS at all) by the LR triggers the UE to wake the MR and to use the MR to perform any associated communication with the network.
[0027] In other words, it will be understood that the MR of the UE works for data transmission and reception purposes, and can be turned off and / or set to deep sleep unless it is turned on as triggered corresponding to a LP-WUS reception at the LR of the UE. In this way, power savings can be achieved relative to a case where there is no LR use and an MR simply always wakes to check for paging according to a DRX cycle.
[0028] To facilitate usage of a LP-WUS mechanism within the system, it has been identified that it is beneficial to ensure that the network and the UE have a synchronized understanding of whether or not the UE is presently monitoring for a LP-WUS.
[0029] For example, it may be that for LP-WUS operation of a UE that is in a radio resource control (RRC) connected mode, the UE and the network may support explicit and / or implicit triggering mechanisms for the LP-WUS monitoring (and potentially confirmation message (s) from the UE to the gNB) for handshake purposes.
[0030] FIG. 1 illustrates a diagram 100 showing a procedure for ensuring that the LP-WUS monitoring status at a UE is synchronized between the UE and a network. The diagram 100 illustrates communications between a base station 110 of the network, an MR 112 of the UE, and an LR 114 of the UE. The diagram 100 begins with the MR 112 of the UE in an ON state 116 and the LR 114 of the UE in the OFF state 122 (e.g., the diagram 100 corresponds to a case where the UE is transitioning from a state that is configured for actively communicating scheduled data to a state where it is awaiting further scheduling from the network prior to subsequent communications) .
[0031] As illustrated, the base station 110 may send an activation indication 102 to the UE on the MR 112 indicating that the UE is to begin LP-WUS monitoring. In response to the activation indication 102, the UE transitions its LR 114 from the OFF state 122 to an ON state 124 and then sends, using the MR 112, an activation confirmation 104 to the base station 110. Accordingly, the network is assured that the activation indication 102 was received and that the UE intends to perform LP-WUS monitoring using the LR 114 (e.g., that the LR 114 will be / has been placed in the ON state 124) .
[0032] Once the activation confirmation 104 is sent, the base station 110 adjusts the MR 112 from the ON state 116 to a sleep state 120, which may occur according to an associated delay 118. While in the sleep state 120, the UE enjoys relative power savings as compared to cases of UEs that use MRs that do not use a sleep state.
[0033] Then, at a later time the base station 110 may determine that it wishes to actively schedule the UE once again. Accordingly the base station 110 sends the UE an LP-WUS 106. As the LR 114 of the UE is in the ON state 124, the UE successfully receives this LP-WUS 106 at the LR 114. In response to the LP-WUS 106, the UE transitions the LR 114 back to the OFF state 122 and wakes up the MR 112 (which may occur according to an associated delay 126) . Once the MR 112 is awake, the UE responds to the LP-WUS 106 by sending the base station, using the MR 112, an LP-WUS confirmation 108 indicating that the LP-WUS 106 was received. Accordingly, the network is assured that the LP-WUS 106 was received and that the UE has woken the MR 112. Note that with the MR 112 back in the ON state 116, the procedure just described in relation to FIG. 1 may repeat sometime in the future.
[0034] Due to the use of the activation confirmation 104 and the LP-WUS confirmation 108 as just described, there is a high confidence level within the system that the UE and the network are synchronized in their understanding of the states of the MR 112 and the LR 114 (e.g., synchronized in their understanding of whether the UE is monitoring for signaling at the MR 112 or at the LR 114) at any given time.
[0035] To facilitate usage of a LP-WUS mechanism within the system, it has also been determined that mechanisms to minimize misdetections / false detections of LP-WUSs at an LR of a UE may be beneficial.
[0036] Embodiments discussed herein accordingly provide solutions that reduce the performance impacts of misalignment between a network and a UE with respect to whether the UE is presently performing LP-WUS monitoring using an LR and / or whether the UE is presently monitoring for signaling (e.g., a PDCCH) at an MR of the UE. Embodiments herein discuss mechanisms for both the prevention and detection of misalignment as between these UE statuses and / or mechanisms for the recovery from such misalignment at the base station and / or the UE.
[0037] Misalignment between the network and the UE can occur according to multiple cases. In a first misalignment case, the network believes that the UE is monitoring for PDCCH signaling on an MR, but the UE is rather monitoring for a LP-WUS using its LR. This case can be caused when a transmitted LP-WUS is missed at the LR of the UE, or by a false detection of an activation indication for LP-WUS monitoring at the MR of the UE (e.g., a case where a base station transmits a ‘0’ representing that the UE should not start LP-WUS monitoring, but where the UE incorrectly detects a ‘1’ and accordingly begins LP-WUS monitoring) .
[0038] Solutions for this first misalignment case discussed herein include mechanisms for the use of acknowledgements (ACKs) to the network in response to a LP-WUS received at an LR of the UE and mechanisms for the use of multiple monitoring occasions for LP-WUSs from the network.
[0039] In a second misalignment case, the network believes that the UE is monitoring for an LP-WUS on a LR, but the UE is rather monitoring for PDCCH signaling using its MR. This can be caused when a transmitted activation indication for activating LP-WUS monitoring is missed at the MR of the UE, or by a false detection of an (affirmative) LP-WUS at the LR of the UE (e.g., a case where a base station transmits a ‘0’ in an LP-WUS representing not waking up, but where the UE incorrectly detects a ‘1’ and accordingly begins monitoring for PDCCH using its MR, or a case where a UE incorrectly detects a LP-WUS that itself represents an instruction to wake up that was not actually sent by the base station) .
[0040] Solutions for this second misalignment case discussed herein include mechanisms for the use of ACK signaling to the network for layer 1 (L1) signaling that includes an LP-WUS activation indication; mechanisms for the use of timer-based behaviors where, if the UE does not receive a PDCCH during a given time duration, the UE starts LP-WUS monitoring; mechanisms for cases where a UE always monitors for LP-WUSs at the LR of the UE; and mechanisms for the use of an extended LP-WUS monitoring time.
[0041] Solutions Corresponding the First Misalignment Case
[0042] Solutions corresponding to a first misalignment case, in which the network believes that the UE is monitoring for PDCCH signaling on an MR, but the UE is actually monitoring for a LP-WUS using its LR, are now discussed. Solutions for this first misalignment case now described work to prevent such a misalignment case from occurring and / or work to correct such a misalignment after it occurs.
[0043] In a first solution corresponding to the first misalignment case, a UE transmits an uplink ACK to the network on an MR when a LP-WUS that indicates that the UE is to wake up its MR is received on an LR. The network then proceeds to understand that the UE is monitoring for PDCCH on its MR only after this ACK is received. If this ACK is not received, the network understands that the UE remains in a state of LP-WUS on its LR.
[0044] It is noted that, in this case, any additional power consumption associated with the transmission of the ACK by the UE is relatively limited (due to the fact that the MR wakes up in response to the LP-WUS regardless of whether the ACK signaling is used) .
[0045] Further, corresponding to the first solution, it may be that the UE does not transmit anything to the network if no LP-WUS is received at the LR of the UE, and / or when an LP-WUS with a negative wake-up indication is received a the LR, which is consistent with the fact that in such cases the MR of the UE does not wake up.
[0046] Embodiments according to the first solution may operate according to a minimum time gap between the LP-WUS that is received at the UE and the corresponding ACK that is sent by the UE. Such a minimum time gap may represent a duration used by the UE for LP-WUS reception, MR wake-up and resynchronization (if needed) , and / or preparation of an uplink (UL) transmission.
[0047] In such cases, a time offset between the LP-WUS and the corresponding ACK sent by the UE should be no less than such a minimum time gap (note that this time offset may be equal to or greater than the minimum time gap) .
[0048] The base station may configure such a time offset to the UE. In some embodiments, the UE may report one or multiple minimum time gap value (s) that the UE is capable of using to the base station, and base station then configures the time offset to the UE subject to this UE capability for the minimum time gap.
[0049] Note that in some cases, it is contemplated that such a minimum time gap may be the same as another minimum time gap understood between LP-WUS and the first PDCCH monitoring the UE can perform after wake-up, and that the report of both of these minimum time gaps may be sent in a same UE capability report.
[0050] In some embodiments of the first solution, it may be that the time offset used between the LP-WUS and the corresponding ACK may be hard coded in a standard defining the operation of the wireless communication system (e.g. in unit of slots) , in which case the time offset may be hard coded such that (at least) an appropriate minimum time gap for the UE is accounted for.
[0051] In a first option of the first solution, the UE may transmit an ACK for the LP-WUS using a physical uplink control channel (PUCCH) resource. In such cases, it may be that the base station configures the PUCCH resource for the UE to use to send the LP-WUS ACK. In such cases where a group-common LP-WUS is transmitted by the base station, the base station may configure different such PUCCH resources for different UEs in the group in order to avoid collisions.
[0052] It may be that a PUCCH carrying an ACK does not occur in the same slot or sub-slot as any other PUCCH carrying uplink control information (UCI) or in a physical uplink shared channel (PUSCH) , such that UCI multiplexing would not be necessary. It is noted that this is reasonable because the MR has just woken up from sleep state, and thus other communications between the base station and UE may not have started yet in earnest.
[0053] In a second option of the first solution, the UE may transmit a scheduling request (SR) in a first SR occasion that occurs after a minimum time gap, where the SR functions as the ACK of the LP-WUS. This second option may be used in cases where the UE is configured with periodic SR resources.
[0054] Under this second option, it may be that if the same cyclic shift is used for LP-WUS acknowledgement as is used for a regular SR, the network may interpret the positive SR received in such an occasion as the acknowledgement for LP-WUS instead of as a regular SR (e.g., due to the timing the positive SR was received relative to the LP-WUS) .
[0055] Alternatively, it may be that a different cyclic shift from the regular SR can be used for LP-WUS ACK signaling. In such a case, the base station understands whether the UE is transmitting a regular SR or an SR as an LP-WUS ACK based on the cyclic shift that is used in the SR.
[0056] In a second solution corresponding to the first misalignment case, the UE is configured with multiple monitoring occasions for LP-WUS. Through the use of multiple monitoring occasions for LP-WUS at the UE, the chance that the UE becomes unsynchronized with the network due to a missed LP-WUS is reduced.
[0057] Embodiments of the second solution may use a mechanism for the base station to determine that UE had missed an LP-WUS. This can be done through, for example, the mechanisms described above in relation to the first solution for the first misalignment case (in which case it may be understood that the first solution and the second solution are combined) .
[0058] Alternatively, it may be that corresponding to the second solution, the base station can determine that the UE has missed an LP-WUS based on the signaling patterns after the transmission of the LP-WUS. For example, if the base station transmits a PDCCH and associated physical downlink shared channel (PDSCH) and does not receive hybrid automatic repeat request acknowledgement (HARQ-ACK) for the PDSCH from the UE, the base station may conclude that the UE did not properly receive a prior LP-WUS and wake up its MR. Or, if the base station transmits a PDCCH that schedules an associated PUSCH and does not receive the scheduled PUSCH from the UE, the base station may conclude that the UE did not properly receive a prior LP-WUS and wake up its MR.
[0059] Once the base station determines that UE has missed the LP-WUS, the base station may proceed to transmit another LP-WUS in a next monitoring occasion. The next monitoring occasion should be sufficiently close to the preliminary monitoring occasion for the missed LP-WUS to ensure fast recovery / resynchronization.
[0060] Various examples of the second solution for LP-WUS use together with connected mode DRX (C-DRX) to indicate the UE to wake up in a next C-DRX on duration are now provided.
[0061] FIG. 2 illustrates a diagram 200 for a first example for the use of multiple LP-WUS monitoring occasions, according to embodiments herein. As illustrated, the base station transmits a first LP-WUS in the first LP-WUS monitoring occasion (MO) 202. If the base station receives the ACK 204 from the UE, it knows that the UE received the first LP-WUS and can start regular communication in the DRX ON duration 208.
[0062] If the base station does not receive ACK 204 from the UE, it transmits a second LP-WUS in the second LP-WUS monitoring occasion 206, as illustrated (giving the system another opportunity to align as to the state of the UE prior to the DRX ON duration 208) . This should greatly reduce the chance of misalignment as to the state of the UE within the system.
[0063] FIG. 3 illustrates a diagram 300 for a second example for the use of multiple LP-WUS monitoring occasions, according to embodiments herein. As illustrated, the base station transmits a LP-WUS in the first LP-WUS monitoring occasion 302 in the figure. Then, the base station proceeds to starts regular communication with UE in the DRX ON duration 306. In the case that, for example, the base station does not receive a HARQ-ACK from the UE for a PDSCH or a PUSCH as may be scheduled for the UE, it transmits a second LP-WUS in the second LP-WUS monitoring occasion 304 (giving the system another opportunity to align as to the state of the UE prior to the end of the DRX ON duration 306) . This should greatly reduce the chance of misalignment as to the state of the UE within the system.
[0064] Solutions Corresponding the Second Misalignment Case
[0065] Solutions corresponding to a second misalignment case, in which the network believes that the UE is monitoring for an LP-WUS on a LR, but the UE is actually monitoring for PDCCH signaling using its MR, are now discussed. Solutions for this second misalignment case now described work to prevent such a misalignment case from occurring and / or work to correct such a misalignment after it occurs.
[0066] In a first solution corresponding to the second misalignment case, the UE transmits ACK signaling for a downlink control information (DCI) signal carrying a LP-WUS activation indication. In this manner, the network is affirmatively informed / confirmed that a UE received the LP-WUS activation indication and is henceforth performing LP-WUS monitoring.
[0067] It may be that this solution operates according to variations according to the type of DCI that is used to carry the LP-WUS activation indication. For example, if the DCI is a DCI scheduling a PDSCH or a PUSCH at the UE, a HARQ-ACK for PDSCH or PUSCH itself can serve the purpose of an ACK for the LP-WUS activation indication.
[0068] In another example, if the DCI is a group-common DCI or a UE-specific non-scheduling DCI, an additional mechanism (beyond HARQ-ACK for PDSCH or PUSCH) may be provided for to allow the UE to transmit the ACK signaling for the LP-WUS activation indication.
[0069] In the case that the DCI is a group-common DCI, the ACK signaling for any LP-WUS activation indication for any particular UE in the group-common DCI should be UE-specific. That is, the base station needs to know which UE (s) have received LP-WUS activation indication in the group common DCI.
[0070] With respect to timing for cases beyond HARQ-ACK for PDSCH or PUSCH, it may be that a slot offset between a (separately provided-for) HARQ-ACK for LP-WUS activation indication and the DCI carrying the LP-WUS activation indication can be RRC configured to the UE by the base station. Alternatively, this timing may be hardcoded per a specification that defines the behavior of the wireless communication system. Still alternatively, in case of non-scheduling DCI, an existing field (e.g., a PDSCH-to-HARQ_feedback timing indicator field) can be reused to indicate the slot offset.
[0071] It is contemplated that ACK signaling for the LP-WUS activation indication may be ACK-only. In such cases, it may be that any ACK signaling means the UE has received the LP-WUS activation signal (regardless of the state of the ACK signaling) . In such cases, nothing is transmitted if the UE has not received the LP-WUS activation signal. In other words, this case represents an ACK-only feedback mechanism.
[0072] It is contemplated that in other embodiments, ACK signaling for the LP-WUS uses ACK / negative acknowledgment (NACK) signaling (where either an ACK or a NACK is explicitly provided in the ACK signaling based on whether an LP-WUS activation indication was received at the UE) . In such cases, it may be that an ACK means the UE receives a positive LP-WUS activation indication, while a NACK means the UE received an (e.g., explicit) negative LP-WUS activation indication from the UE. This case may be applicable to the use by the base station of group-common DCI for providing LP-WUS activation indication (s) , and where the UE may have received the DCI, but the indication for that particular UE in the group-common DCI may be positive or negative. This is also applicable to the case of non-scheduling DCI if the non-scheduling DCI can also serve purpose (s) other than indicating LP-WUS activation.
[0073] With respect to the first solution corresponding to the second misalignment case, ACK signaling (e.g., ACK and / or NACK indications) can be transmitted using a PUCCH resource according to one of multiple options. In a first such option, the base station configures the PUCCH resource for a DCI carrying LP-WUS activation indication. In case of group-common DCI, the base station may configure different PUCCH resources for different UEs in the group to avoid collision.
[0074] In a second such option, in the case of UE-specific non-scheduling DCI, the PUCCH resource can be indicated in the DCI by reusing an existing PUCCH resource indication field that is present in the DCI (and that is otherwise not being used for scheduling due to the non-scheduling nature of the DCI) .
[0075] Options for HARQ-ACK codebook used for the ACK signaling with respect to the first solution corresponding to the second misalignment case are now discussed. In a first option, it is not expected that HARQ-ACK / ACK signaling for LP-WUS activation indication occurs in the same slot or sub-slot as any other HARQ-ACK. Corresponding to such cases, single-bit HARQ-ACK codebook having the ACK signaling is transmitted in this case. It is noted that it may be reasonable to expect no other activities for the UE corresponding to a need for HARQ-ACK signaling are relevant at this time, as the MR is expected to go into sleep mode after receiving the LP-WUS activation indication.
[0076] In a second option, ACK signaling for the LP-WUS activation indication is appended as an additional bit to any HARQ-ACK codebook in the case of other HARQ-ACK bits not related to the LP-WUS activation indication do occur corresponding to the same slot or sub-slot.
[0077] In a third option, for a Type-1 HARQ-ACK codebook with a UE-specific non-scheduling DCI, a time domain resource allocation (TDRA) field of the non-scheduling DCI may be used to transmit a dummy TDRA allocation, which is used to derive the bit location in the HARQ-ACK codebook for a bit of the ACK signaling for the LP-WUS activation indication.
[0078] In a fourth option, for a Type-2 HARQ-ACK codebook with a UE-specific non-scheduling DCI, a downlink assignment index (DAI) field of the UE-specific non-scheduling DCI can be used to enable a mechanism of the UE to construct a HARQ-ACK codebook that includes the ACK signaling for the LP-WUS activation indication using the DAI (e.g., according to a known mechanism for DAI use) .
[0079] Options for UCI multiplexing that accounts for the ACK signaling with respect to the first solution corresponding to the second misalignment case are now discussed. In a first option, the UE does not expect the HARQ-ACK / ACK signaling for the LP-WUS activation indication to be multiplexed with any other UCI, or to be multiplexed on PUSCH. This means that a PUCCH for the ACK signaling of the LP-WUS does not occur in the same slot or sub-slot as any other UCI, or overlapping with PUSCH in time.
[0080] In a second option, the UE follows known procedures for UCI multiplexing, incorporating the ACK signaling for the LP-WUS into the procedure.
[0081] Various cases for the impact of the ACK signaling for a LP-WUS activation indication on the use of LP-WUS monitoring at the UE with respect to the first solution corresponding to the second misalignment case are now discussed. In some cases, the transmission / use of ACK signaling for the LP-WUS activation indication may not impact when the UE starts LP-WUS monitoring (e.g., the UE immediately begins LP-WUS monitoring upon receiving the LP-WUS activation indication, regardless of the existence and / or timing of any ACK signaling) . In other cases, the UE may not start LP-WUS monitoring until the ACK signaling for the LP-WUS activation indication is transmitted.
[0082] In a second solution corresponding to the second misalignment case, the UE supports a timer-based mechanism that uses a PDCCH monitoring time. If the UE that is monitoring for a PDCCH on its MR does not receive a PDCCH for a given time duration tracked by the PDCCH monitoring timer, the UE independently transitions to a LP-WUS monitoring state. This automatically makes the base station and UE become aligned once the timer expires in second misalignment case situations (when the network incorrectly thinks that the UE is performing LP-WUS monitoring)
[0083] FIG. 4 illustrates a diagram 400 for the use of a PDCCH monitoring timer to correct an alignment between the UE and the network when the network incorrectly thinks that the UE is performing LP-WUS monitoring, according to embodiments disclosed herein. The diagram illustrates a case where the UE is performing PDCCH monitoring 404. The base station then sends the UE an LP-WUS activation indication 402 in an attempt to get the UE to perform a sleep of the MR and transition to instead performing LP-WUS monitoring using an LR.
[0084] However, as illustrated, the UE misses the LP-WUS activation indication 402, and therefore continues with the PDCCH monitoring 404. Thus, there is an out of alignment phase 406, where the base station believes 408 that the UE is performing LP-WUS monitoring (as was instructed by the LP-WUS activation indication 402) , but where the UE is actually performing PDCCH monitoring 404. Due to this misalignment, no PDCCH is received at the UE (because the base station is not sending the UE any such PDCCH, as it believes that the UE is instead monitoring for LP-WUSs) .
[0085] Due to this lack of PDCCH reception at the UE, a PDCCH monitoring timer at the UE that tracks a duration between the receipt of PDCCHs (which may have been enabled at / by the UE upon previously beginning the PDCCH monitoring 404) at the UE eventually undergoes a timer expiration 410. In response to the timer expiration 410, the UE stops performing the PDCCH monitoring 404 with its MR (and it puts the MR to sleep) and begins to instead perform LP-WUS monitoring 412 with its LR. At this point, as illustrated, because the base station believes 408 that the UE is monitoring for LP-WUSs, and because the UE is now actually performing LP-WUS monitoring 412, the UE and the base station are back in alignment (corresponding to the back in alignment 414 phase illustrated in FIG. 4) .
[0086] In a third solution corresponding to the second misalignment case, it may be that a UE always monitors LP-WUS on the LR, even when it is (also) performing PDCCH monitoring on the MR. In such cases, if the base station erroneously believes that the UE is monitoring LP-WUS instead of monitoring for a PDCCH, but UE is in fact monitoring for PDCCH, a LP-WUS correspondingly transmitted by the base station will still be correctly received by the UE. It is noted that the power cost associated with always performing LP-WUS monitoring at the UE may be acceptable, in that the LR used for LP-WUS monitoring uses relatively little power.
[0087] In a fourth solution corresponding to the second misalignment case, an extended LP-WUS monitoring time may be used at the UE. In this fourth solution, after the UE receives a LP-WUS instructing the UE to wake up the MR and begin performing PDCCH monitoring, the UE starts the PDCCH monitoring as instructed and further continues to monitor for (additional) LP-WUSs until it receives a valid signal (e.g. PDCCH) from the base station on the now-woken MR. In this way, the UE can confirm that the initial LP-WUS was not a false detection of LP-WUS (e.g., avoids the case where the UE detected the LP-WUS that the base station did not actually transmit and / or the case where the base station transmitted a LP-WUS with negative wake-up indication but UE detected a positive wake-up indication instead) . A valid signal from base station thus serves as the confirmation for the (positive) wake-up indication. Once a valid signal is received, UE knows that the (positive) wake-up indication is valid (and thus that the network is of the belief that the UE is performing the PDCCH monitoring) and can stop performing LP-WUS monitoring simultaneously with the PDCCH monitoring.
[0088] FIG. 5 illustrates a method 500 of a UE, according to embodiments discussed herein. The method 500 includes receiving 502, from a base station, at an LR of the UE, a LP-WUS at a first time. The method 500 further includes identifying 504 a time offset for use between the LP-WUS and an ACK of the LP-WUS. The method 500 further includes sending 506, to the base station, using a MR of the UE, the ACK at a second time that follows the first time by the time offset.
[0089] In some embodiments of the method 500, the time offset is greater than or equal to a minimum time gap that is for the UE to at least: process the LP-WUS upon reception by the UE using the LR; wake up the MR in response to the receiving the LP-WUS; and generate the ACK.
[0090] In some embodiments of the method 500, the time offset is greater than or equal to a minimum time gap that is for the UE to at least: process the LP-WUS upon reception by the UE using the LR; wake up the MR in response to the receiving the LP-WUS; and begin monitoring a PDCCH using the MR after waking up the MR.
[0091] In some embodiments, the method 500 further includes receiving, from the base station, a message comprising the time offset. In some such embodiments, the method 500 further includes sending, to the base station, a minimum time gap, wherein the time offset received from the base station is greater than or equal to the minimum time gap. In some of these cases, the minimum time gap is for the UE to at least: process the LP-WUS upon reception by the UE using the LR; wake up the MR in response to the receiving the LP-WUS; and generate the ACK. In some of these cases, the minimum time gap is for the UE to at least: process the LP-WUS upon reception by the UE using the LR; wake up the MR in response to the receiving the LP-WUS; and begin monitoring a PDCCH using the MR after waking up the MR.
[0092] In some embodiments, the method 500 further includes receiving, from the base station, configuration information for a PUCCH resource for the ACK, wherein the ACK is sent to the base station using the PUCCH resource.
[0093] In some embodiments, the method 500 further includes receiving, from the base station, configuration information for periodic SR resources, wherein the ACK is sent to the base station in a first SR resource of the periodic SR resources. In some such embodiments, the ACK uses a cyclic shift that indicates that the ACK is for acknowledging the LP-WUS.
[0094] FIG. 6 illustrates a method 600 of a base station, according to embodiments discussed herein. The method 600 includes sending 602, to a UE, an LP-WUS at a first time. The method 600 further includes identifying 604 a time offset between the LP-WUS and an ACK of the LP-WUS. The method 600 further includes receiving 606, from the UE, the ACK at a second time that follows the first time by the time offset.
[0095] In some embodiments of the method 600, the time offset is greater than or equal to a minimum time gap that is for the UE to at least: process the LP-WUS upon reception by the UE using an LR of the UE; wake up an MR of the UE in response to the receiving the LP-WUS; and generate the ACK.
[0096] In some embodiments of the method 600, the time offset is greater than or equal to a minimum time gap that is for the UE to at least: process the LP-WUS upon reception by the UE using an LR of the UE; wake up an MR of the UE in response to the receiving the LP-WUS; and begin monitoring a PDCCH using the MR after waking up the MR.
[0097] In some embodiments, the method 600 further includes sending, to the UE, a message comprising the time offset. In some such embodiments, the method 600 further includes receiving, from the UE, a minimum time gap, and wherein the time offset is identified by the base station to be greater than or equal to the minimum time gap. In some of these cases, the minimum time gap is for the UE to at least: process the LP-WUS upon reception by the UE using an LR of the UE; wake up an MR of the UE in response to the receiving the LP-WUS; and generate the ACK. In some of these cases, the minimum time gap is for the UE to at least: process the LP-WUS upon reception by the UE using an LR of the UE; wake up an MR of the UE in response to the receiving the LP-WUS; and begin monitoring a PDCCH using the MR after waking up the MR.
[0098] In some embodiments, the method 600 further includes sending, to the UE, configuration information for a PUCCH resource for the ACK, wherein the ACK is received from the UE in the PUCCH resource.
[0099] In some embodiments, the method 600 further includes sending, to the UE, configuration information for periodic SR resources, wherein the ACK is received from the UE in a first SR resource of the periodic SR resources. In some such embodiments, the ACK uses a cyclic shift that indicates that the ACK is for acknowledging the LP-WUS.
[0100] FIG. 7 illustrates a method 700 of a base station, according to embodiments discussed herein. The method 700 includes transmitting 702 an LP-WUS to a UE in a first MO. The method 700 further includes determining 704 that the UE did not accurately receive the LP-WUS in the first MO. The method 700 further includes retransmitting 706 retransmits the LP-WUS to the UE in a second MO in response to the determining that the UE did not accurately receive the LP-WUS in the first MO.
[0101] In some embodiments of the method 700, the determining that the UE did not accurately receive the LP-WUS in the first MO comprises identifying that an expected ACK of the LP-WUS was not received from the UE.
[0102] In some embodiments of the method 700, the determining that the UE did not accurately receive the LP-WUS in the first MO comprises identifying that the UE is not receiving or sending using resources scheduled for the UE by the base station after sending the LP-WUS.
[0103] In some embodiments of the method 700, the second MO occurs during a DRX on cycle for the UE.
[0104] FIG. 8 illustrates a method 800 of a first UE, according to embodiments discussed herein. The method 800 includes receiving 802, from a base station, at a first time, a DCI comprising a first LP-WUS activation indication, wherein the DCI comprises one of a group-common DCI and a UE-specific non-scheduling DCI for the first UE. The method 800 further includes identifying 804 a time offset for use between the DCI and first HARQ-ACK signaling for the first LP-WUS activation indication. The method 800 further includes sending 806, to the base station, at a second time, the first HARQ-ACK signaling for the first LP-WUS activation indication, wherein the second time follows the first time by the time offset.
[0105] In some embodiments, the method 800 further includes receiving, from the base station, an RRC message comprising the time offset.
[0106] In some embodiments of the method 800, the DCI comprises the UE-specific non-scheduling DCI for the first UE, wherein the UE-specific non-scheduling DCI comprises the time offset.
[0107] In some embodiments of the method 800, the first HARQ-ACK signaling comprises an ACK that indicates that the first UE received the first LP-WUS activation indication.
[0108] In some embodiments of the method 800, the first LP-WUS activation indication instructs the first UE to perform LP-WUS monitoring, and the first HARQ-ACK signaling comprises an ACK that indicates that the first UE will perform the LP-WUS monitoring.
[0109] In some embodiments of the method 800, the first LP-WUS activation indication instructs the first UE not to perform LP-WUS monitoring, and the first HARQ-ACK signaling comprises a NACK that indicates that the first UE will not perform the LP-WUS monitoring.
[0110] In some embodiments of the method 800, the DCI comprises the group-common DCI, and the group-common DCI comprises a second LP-WUS activation indication for a second UE.
[0111] In some embodiments, the method 800 further comprises receiving, from the base station, configuration information for a PUCCH for the DCI comprising the first LP-WUS activation indication, wherein the first HARQ-ACK signaling is sent in the PUCCH.
[0112] In some embodiments of the method 800, the DCI further comprises a PUCCH resource indication identifying a PUCCH for the first HARQ-ACK signaling, and wherein the first HARQ-ACK signaling is sent in the PUCCH.
[0113] In some embodiments of the method 800, the first HARQ-ACK signaling uses a first slot, and further comprising appending to the first HARQ-ACK signaling to second HARQ-ACK signaling that uses the first slot.
[0114] In some embodiments of the method 800, the DCI comprises the UE-specific non-scheduling DCI for the first UE, and wherein the UE-specific non-scheduling DCI indicates a bit location for the first HARQ-ACK signaling via a TDRA field.
[0115] FIG. 9 illustrates a method 900 of a base station, according to embodiments discussed herein. The method 900 includes sending 902, to a first UE, at a first time, a DCI comprising a first LP-WUS activation indication, wherein the DCI comprises one of a group-common DCI and a UE-specific non-scheduling DCI for the first UE. The method 900 further includes identifying 904 a time offset for use between the DCI and first HARQ-ACK signaling for the first LP-WUS activation indication. The method 900 further includes receiving 906, from the first UE, at a second time, the first HARQ-ACK signaling for the first LP-WUS activation indication, wherein the second time follows the first time by the time offset.
[0116] In some embodiments, the method 900 further includes sending, to the UE, an RRC message comprising the time offset.
[0117] In some embodiments of the method 900, the DCI comprises the UE-specific non-scheduling DCI for the first UE, wherein the UE-specific non-scheduling DCI comprises the time offset.
[0118] In some embodiments of the method 900, the first HARQ-ACK signaling comprises an ACK that indicates that the first UE received the first LP-WUS activation indication.
[0119] In some embodiments of the method 900, the first LP-WUS activation indication instructs the first UE to perform LP-WUS monitoring, and the first HARQ-ACK signaling comprises an ACK that indicates that the first UE will perform the LP-WUS monitoring.
[0120] In some embodiments of the method 900, the first LP-WUS activation indication instructs the first UE not to perform LP-WUS monitoring, and the first HARQ-ACK signaling comprises a NACK that indicates that the first UE will not perform the LP-WUS monitoring.
[0121] In some embodiments of the method 900, the DCI comprises the group-common DCI, and the group-common DCI comprises a second LP-WUS activation indication for a second UE.
[0122] In some embodiments, the method 900 further includes sending, to the UE, configuration information for a PUCCH for the DCI comprising the first LP-WUS activation indication, wherein the first HARQ-ACK signaling is sent in the PUCCH.
[0123] In some embodiments of the method 900, the DCI further comprises a PUCCH resource indication identifying a PUCCH for the first HARQ-ACK signaling, and the first HARQ-ACK signaling is sent in the PUCCH.
[0124] In some embodiments of the method 900, the first HARQ-ACK signaling uses a first slot, wherein the first HARQ-ACK signaling is appended to second HARQ-ACK signaling that uses the first slot.
[0125] In some embodiments of the method 900, the DCI comprises the UE-specific non-scheduling DCI for the first UE, and the UE-specific non-scheduling DCI indicates a bit location for the first HARQ-ACK signaling via a TDRA field.
[0126] FIG. 10 illustrates a method 1000 of a UE, according to embodiments discussed herein. The method 1000 includes starting 1002 a PDCCH monitoring timer. The method 1000 further includes performing 1004, at an MR of the UE, PDCCH monitoring while the PDCCH monitoring timer is running. The method 1000 further includes determining 1006, after the PDCCH monitoring timer expires, that no PDCCH was received at the MR while the PDCCH monitoring timer was running. The method 1000 further includes initiating 1008 LP-WUS monitoring at an LR of the UE in response to the determining that no PDCCH was received at the MR while the PDCCH monitoring timer was running.
[0127] FIG. 11 illustrates a method 1100 of a UE, according to embodiments discussed herein. The method 1100 includes initiating 1102 a PDCCH monitoring procedure at an MR of the UE in response to detecting an LP-WUS from a base station at an LR of the UE during a LP-WUS monitoring procedure. The method 1100 further includes detecting 1104 a PDCCH from the base station at the MR according during the PDCCH monitoring procedure. The method 1100 further includes deactivating 1106 the LP-WUS monitoring procedure in response to the detecting the PDCCH.
[0128] FIG. 12 illustrates an example architecture of a wireless communication system 1200, according to embodiments disclosed herein. The following description is provided for an example wireless communication system 1200 that operates in conjunction with the LTE system standards and / or 5G or NR system standards as provided by 3GPP technical specifications.
[0129] As shown by FIG. 12, the wireless communication system 1200 includes UE 1202 and UE 1204 (although any number of UEs may be used) . In this example, the UE 1202 and the UE 1204 are illustrated as smartphones (e.g., handheld touchscreen mobile computing devices connectable to one or more cellular networks) , but may also comprise any mobile or non-mobile computing device configured for wireless communication.
[0130] The UE 1202 and UE 1204 may be configured to communicatively couple with a RAN 1206. In embodiments, the RAN 1206 may be NG-RAN, E-UTRAN, etc. The UE 1202 and UE 1204 utilize connections (or channels) (shown as connection 1208 and connection 1210, respectively) with the RAN 1206, each of which comprises a physical communications interface. The RAN 1206 can include one or more base stations (such as base station 1212 and base station 1214) that enable the connection 1208 and connection 1210.
[0131] In this example, the connection 1208 and connection 1210 are air interfaces to enable such communicative coupling, and may be consistent with RAT (s) used by the RAN 1206, such as, for example, an LTE and / or NR.
[0132] In some embodiments, the UE 1202 and UE 1204 may also directly exchange communication data via a sidelink interface 1216. The UE 1204 is shown to be configured to access an access point (shown as AP 1218) via connection 1220. By way of example, the connection 1220 can comprise a local wireless connection, such as a connection consistent with any IEEE 802.11 protocol, wherein the AP 1218 may comprise a router. In this example, the AP 1218 may be connected to another network (for example, the Internet) without going through a CN 1224.
[0133] In embodiments, the UE 1202 and UE 1204 can be configured to communicate using orthogonal frequency division multiplexing (OFDM) communication signals with each other or with the base station 1212 and / or the base station 1214 over a multicarrier communication channel in accordance with various communication techniques, such as, but not limited to, an orthogonal frequency division multiple access (OFDMA) communication technique (e.g., for downlink communications) or a single carrier frequency division multiple access (SC-FDMA) communication technique (e.g., for uplink and ProSe or sidelink communications) , although the scope of the embodiments is not limited in this respect. The OFDM signals can comprise a plurality of orthogonal subcarriers.
[0134] In some embodiments, all or parts of the base station 1212 or base station 1214 may be implemented as one or more software entities running on server computers as part of a virtual network. In addition, or in other embodiments, the base station 1212 or base station 1214 may be configured to communicate with one another via interface 1222. In embodiments where the wireless communication system 1200 is an LTE system (e.g., when the CN 1224 is an EPC) , the interface 1222 may be an X2 interface. The X2 interface may be defined between two or more base stations (e.g., two or more eNBs and the like) that connect to an EPC, and / or between two eNBs connecting to the EPC. In embodiments where the wireless communication system 1200 is an NR system (e.g., when CN 1224 is a 5GC) , the interface 1222 may be an Xn interface. The Xn interface is defined between two or more base stations (e.g., two or more gNBs and the like) that connect to 5GC, between a base station 1212 (e.g., a gNB) connecting to 5GC and an eNB, and / or between two eNBs connecting to 5GC (e.g., CN 1224) .
[0135] The RAN 1206 is shown to be communicatively coupled to the CN 1224. The CN 1224 may comprise one or more network elements 1226, which are configured to offer various data and telecommunications services to customers / subscribers (e.g., users of UE 1202 and UE 1204) who are connected to the CN 1224 via the RAN 1206. The components of the CN 1224 may be implemented in one physical device or separate physical devices including components to read and execute instructions from a machine-readable or computer-readable medium (e.g., a non-transitory machine-readable storage medium) .
[0136] In embodiments, the CN 1224 may be an EPC, and the RAN 1206 may be connected with the CN 1224 via an S1 interface 1228. In embodiments, the S1 interface 1228 may be split into two parts, an S1 user plane (S1-U) interface, which carries traffic data between the base station 1212 or base station 1214 and a serving gateway (S-GW) , and the S1-MME interface, which is a signaling interface between the base station 1212 or base station 1214 and mobility management entities (MMEs) .
[0137] In embodiments, the CN 1224 may be a 5GC, and the RAN 1206 may be connected with the CN 1224 via an NG interface 1228. In embodiments, the NG interface 1228 may be split into two parts, an NG user plane (NG-U) interface, which carries traffic data between the base station 1212 or base station 1214 and a user plane function (UPF) , and the S1 control plane (NG-C) interface, which is a signaling interface between the base station 1212 or base station 1214 and access and mobility management functions (AMFs) .
[0138] Generally, an application server 1230 may be an element offering applications that use internet protocol (IP) bearer resources with the CN 1224 (e.g., packet switched data services) . The application server 1230 can also be configured to support one or more communication services (e.g., VoIP sessions, group communication sessions, etc. ) for the UE 1202 and UE 1204 via the CN 1224. The application server 1230 may communicate with the CN 1224 through an IP communications interface 1232.
[0139] FIG. 13 illustrates a system 1300 for performing signaling 1334 between a wireless device 1302 and a network device 1318, according to embodiments disclosed herein. The system 1300 may be a portion of a wireless communications system as herein described. The wireless device 1302 may be, for example, a UE of a wireless communication system. The network device 1318 may be, for example, a base station (e.g., an eNB or a gNB) of a wireless communication system.
[0140] The wireless device 1302 may include one or more processor (s) 1304. The processor (s) 1304 may execute instructions such that various operations of the wireless device 1302 are performed, as described herein. The processor (s) 1304 may include one or more baseband processors implemented using, for example, a central processing unit (CPU) , a digital signal processor (DSP) , an application specific integrated circuit (ASIC) , a controller, a field programmable gate array (FPGA) device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein.
[0141] The wireless device 1302 may include a memory 1306. The memory 1306 may be a non-transitory computer-readable storage medium that stores instructions 1308 (which may include, for example, the instructions being executed by the processor (s) 1304) . The instructions 1308 may also be referred to as program code or a computer program. The memory 1306 may also store data used by, and results computed by, the processor (s) 1304.
[0142] The wireless device 1302 may include one or more transceiver (s) 1310 that may include radio frequency (RF) transmitter circuitry and / or receiver circuitry that use the antenna (s) 1312 of the wireless device 1302 to facilitate signaling (e.g., the signaling 1334) to and / or from the wireless device 1302 with other devices (e.g., the network device 1318) according to corresponding RATs.
[0143] The wireless device 1302 may include one or more antenna (s) 1312 (e.g., one, two, four, or more) . For embodiments with multiple antenna (s) 1312, the wireless device 1302 may leverage the spatial diversity of such multiple antenna (s) 1312 to send and / or receive multiple different data streams on the same time and frequency resources. This behavior may be referred to as, for example, multiple input multiple output (MIMO) behavior (referring to the multiple antennas used at each of a transmitting device and a receiving device that enable this aspect) . MIMO transmissions by the wireless device 1302 may be accomplished according to precoding (or digital beamforming) that is applied at the wireless device 1302 that multiplexes the data streams across the antenna (s) 1312 according to known or assumed channel characteristics such that each data stream is received with an appropriate signal strength relative to other streams and at a desired location in the spatial domain (e.g., the location of a receiver associated with that data stream) . Certain embodiments may use single user MIMO (SU-MIMO) methods (where the data streams are all directed to a single receiver) and / or multi user MIMO (MU-MIMO) methods (where individual data streams may be directed to individual (different) receivers in different locations in the spatial domain) .
[0144] In certain embodiments having multiple antennas, the wireless device 1302 may implement analog beamforming techniques, whereby phases of the signals sent by the antenna (s) 1312 are relatively adjusted such that the (joint) transmission of the antenna (s) 1312 can be directed (this is sometimes referred to as beam steering) .
[0145] The wireless device 1302 may include one or more interface (s) 1314. The interface (s) 1314 may be used to provide input to or output from the wireless device 1302. For example, a wireless device 1302 that is a UE may include interface (s) 1314 such as microphones, speakers, a touchscreen, buttons, and the like in order to allow for input and / or output to the UE by a user of the UE. Other interfaces of such a UE may be made up of transmitters, receivers, and other circuitry (e.g., other than the transceiver (s) 1310 / antenna (s) 1312 already described) that allow for communication between the UE and other devices and may operate according to known protocols (e.g., and the like) .
[0146] The wireless device 1302 may include an LP-WUS operations module 1316. The LP-WUS operations module 1316 may be implemented via hardware, software, or combinations thereof. For example, the LP-WUS operations module 1316 may be implemented as a processor, circuit, and / or instructions 1308 stored in the memory 1306 and executed by the processor (s) 1304. In some examples, the LP-WUS operations module 1316 may be integrated within the processor (s) 1304 and / or the transceiver (s) 1310. For example, the LP-WUS operations module 1316 may be implemented by a combination of software components (e.g., executed by a DSP or a general processor) and hardware components (e.g., logic gates and circuitry) within the processor (s) 1304 or the transceiver (s) 1310.
[0147] The LP-WUS operations module 1316 may be used for various aspects of the present disclosure, for example, aspects of FIG. 1 through FIG. 11. The LP-WUS operations module 1316 may configure the wireless device 1302 to, for example, perform ACK signaling for a LP-WUS, to use multiple monitoring occasions for LP-WUS reception, to perform ACK signaling for a LP-WUS activation indication, to implement timer based-mechanisms for PDCCH monitoring, and / or to simultaneously monitor for both LP-WUS and PDCCH, in the manner discussed herein.
[0148] The network device 1318 may include one or more processor (s) 1320. The processor (s) 1320 may execute instructions such that various operations of the network device 1318 are performed, as described herein. The processor (s) 1320 may include one or more baseband processors implemented using, for example, a CPU, a DSP, an ASIC, a controller, an FPGA device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein.
[0149] The network device 1318 may include a memory 1322. The memory 1322 may be a non-transitory computer-readable storage medium that stores instructions 1324 (which may include, for example, the instructions being executed by the processor (s) 1320) . The instructions 1324 may also be referred to as program code or a computer program. The memory 1322 may also store data used by, and results computed by, the processor (s) 1320.
[0150] The network device 1318 may include one or more transceiver (s) 1326 that may include RF transmitter circuitry and / or receiver circuitry that use the antenna (s) 1328 of the network device 1318 to facilitate signaling (e.g., the signaling 1334) to and / or from the network device 1318 with other devices (e.g., the wireless device 1302) according to corresponding RATs.
[0151] The network device 1318 may include one or more antenna (s) 1328 (e.g., one, two, four, or more) . In embodiments having multiple antenna (s) 1328, the network device 1318 may perform MIMO, digital beamforming, analog beamforming, beam steering, etc., as has been described.
[0152] The network device 1318 may include one or more interface (s) 1330. The interface (s) 1330 may be used to provide input to or output from the network device 1318. For example, a network device 1318 that is a base station may include interface (s) 1330 made up of transmitters, receivers, and other circuitry (e.g., other than the transceiver (s) 1326 / antenna (s) 1328 already described) that enables the base station to communicate with other equipment in a core network, and / or that enables the base station to communicate with external networks, computers, databases, and the like for purposes of operations, administration, and maintenance of the base station or other equipment operably connected thereto.
[0153] The network device 1318 may include an LP-WUS operations module 1332. The LP-WUS operations module 1332 may be implemented via hardware, software, or combinations thereof. For example, the LP-WUS operations module 1332 may be implemented as a processor, circuit, and / or instructions 1324 stored in the memory 1322 and executed by the processor (s) 1320. In some examples, the LP-WUS operations module 1332 may be integrated within the processor (s) 1320 and / or the transceiver (s) 1326. For example, the LP-WUS operations module 1332 may be implemented by a combination of software components (e.g., executed by a DSP or a general processor) and hardware components (e.g., logic gates and circuitry) within the processor (s) 1320 or the transceiver (s) 1326.
[0154] The LP-WUS operations module 1332 may be used for various aspects of the present disclosure, for example, aspects of FIG. 1 through FIG. 11. The LP-WUS operations module 1332 may configure the network device 1318 to, for example, receive and use ACK signaling for a LP-WUS and / or to receive and use ACK signaling for a LP-WUS activation indication, in the manner discussed herein.
[0155] Embodiments contemplated herein include an apparatus comprising means to perform one or more elements of any of the method 500, the method 800, the method 1000, and / or the method 1100. This apparatus may be, for example, an apparatus of a UE (such as a wireless device 1302 that is a UE, as described herein) .
[0156] Embodiments contemplated herein include one or more non-transitory computer-readable media comprising instructions to cause an electronic device, upon execution of the instructions by one or more processors of the electronic device, to perform one or more elements of any of the method 500, the method 800, the method 1000, and / or the method 1100. This non-transitory computer-readable media may be, for example, a memory of a UE (such as a memory 1306 of a wireless device 1302 that is a UE, as described herein) .
[0157] Embodiments contemplated herein include an apparatus comprising logic, modules, or circuitry to perform one or more elements of any of the method 500, the method 800, the method 1000, and / or the method 1100. This apparatus may be, for example, an apparatus of a UE (such as a wireless device 1302 that is a UE, as described herein) .
[0158] Embodiments contemplated herein include an apparatus comprising: one or more processors and one or more computer-readable media comprising instructions that, when executed by the one or more processors, cause the one or more processors to perform one or more elements of any of the method 500, the method 800, the method 1000, and / or the method 1100. This apparatus may be, for example, an apparatus of a UE (such as a wireless device 1302 that is a UE, as described herein) .
[0159] Embodiments contemplated herein include a signal as described in or related to one or more elements of any of the method 500, the method 800, the method 1000, and / or the method 1100.
[0160] Embodiments contemplated herein include a computer program or computer program product comprising instructions, wherein execution of the program by a processor is to cause the processor to carry out one or more elements of any of the method 500, the method 800, the method 1000, and / or the method 1100. The processor may be a processor of a UE (such as a processor (s) 1304 of a wireless device 1302 that is a UE, as described herein) . These instructions may be, for example, located in the processor and / or on a memory of the UE (such as a memory 1306 of a wireless device 1302 that is a UE, as described herein) .
[0161] Embodiments contemplated herein include an apparatus comprising means to perform one or more elements of any of the method 600, the method 700, and / or the method 900. This apparatus may be, for example, an apparatus of a base station (such as a network device 1318 that is a base station, as described herein) .
[0162] Embodiments contemplated herein include one or more non-transitory computer-readable media comprising instructions to cause an electronic device, upon execution of the instructions by one or more processors of the electronic device, to perform one or more elements of any of the method 600, the method 700, and / or the method 900. This non-transitory computer-readable media may be, for example, a memory of a base station (such as a memory 1322 of a network device 1318 that is a base station, as described herein) .
[0163] Embodiments contemplated herein include an apparatus comprising logic, modules, or circuitry to perform one or more elements of any of the method 600, the method 700, and / or the method 900. This apparatus may be, for example, an apparatus of a base station (such as a network device 1318 that is a base station, as described herein) .
[0164] Embodiments contemplated herein include an apparatus comprising: one or more processors and one or more computer-readable media comprising instructions that, when executed by the one or more processors, cause the one or more processors to perform one or more elements of any of the method 600, the method 700, and / or the method 900. This apparatus may be, for example, an apparatus of a base station (such as a network device 1318 that is a base station, as described herein) .
[0165] Embodiments contemplated herein include a signal as described in or related to one or more elements of any of the method 600, the method 700, and / or the method 900.
[0166] Embodiments contemplated herein include a computer program or computer program product comprising instructions, wherein execution of the program by a processing element is to cause the processing element to carry out one or more elements of any of the method 600, the method 700, and / or the method 900. The processor may be a processor of a base station (such as a processor (s) 1320 of a network device 1318 that is a base station, as described herein) . These instructions may be, for example, located in the processor and / or on a memory of the base station (such as a memory 1322 of a network device 1318 that is a base station, as described herein) .
[0167] For one or more embodiments, at least one of the components set forth in one or more of the preceding figures may be configured to perform one or more operations, techniques, processes, and / or methods as set forth herein. For example, a baseband processor as described herein in connection with one or more of the preceding figures may be configured to operate in accordance with one or more of the examples set forth herein. For another example, circuitry associated with a UE, base station, network element, etc. as described above in connection with one or more of the preceding figures may be configured to operate in accordance with one or more of the examples set forth herein.
[0168] Any of the above described embodiments may be combined with any other embodiment (or combination of embodiments) , unless explicitly stated otherwise. The foregoing description of one or more implementations provides illustration and description, but is not intended to be exhaustive or to limit the scope of embodiments to the precise form disclosed. Modifications and variations are possible in light of the above teachings or may be acquired from practice of various embodiments.
[0169] Embodiments and implementations of the systems and methods described herein may include various operations, which may be embodied in machine-executable instructions to be executed by a computer system. A computer system may include one or more general-purpose or special-purpose computers (or other electronic devices) . The computer system may include hardware components that include specific logic for performing the operations or may include a combination of hardware, software, and / or firmware.
[0170] It should be recognized that the systems described herein include descriptions of specific embodiments. These embodiments can be combined into single systems, partially combined into other systems, split into multiple systems or divided or combined in other ways. In addition, it is contemplated that parameters, attributes, aspects, etc. of one embodiment can be used in another embodiment. The parameters, attributes, aspects, etc. are merely described in one or more embodiments for clarity, and it is recognized that the parameters, attributes, aspects, etc. can be combined with or substituted for parameters, attributes, aspects, etc. of another embodiment unless specifically disclaimed herein.
[0171] It is well understood that the use of personally identifiable information should follow privacy policies and practices that are generally recognized as meeting or exceeding industry or governmental requirements for maintaining the privacy of users. In particular, personally identifiable information data should be managed and handled so as to minimize risks of unintentional or unauthorized access or use, and the nature of authorized use should be clearly indicated to users.
[0172] Although the foregoing has been described in some detail for purposes of clarity, it will be apparent that certain changes and modifications may be made without departing from the principles thereof. It should be noted that there are many alternative ways of implementing both the processes and apparatuses described herein. Accordingly, the present embodiments are to be considered illustrative and not restrictive, and the description is not to be limited to the details given herein, but may be modified within the scope and equivalents of the appended claims.
Claims
1.A method of a user equipment (UE) , comprising:receiving, from a base station, at a low-power receiver (LR) of the UE, a low-power wake-up signal (LP-WUS) at a first time;identifying a time offset for use between the LP-WUS and an acknowledgement (ACK) of the LP-WUS; andsending, to the base station, using a main radio (MR) of the UE, the ACK at a second time that follows the first time by the time offset.2.The method of claim 1, wherein the time offset is greater than or equal to a minimum time gap that is for the UE to at least:process the LP-WUS upon reception by the UE using the LR;wake up the MR in response to the receiving the LP-WUS; andgenerate the ACK.3.The method of claim 1, wherein the time offset is greater than or equal to a minimum time gap that is for the UE to at least:process the LP-WUS upon reception by the UE using the LR;wake up the MR in response to the receiving the LP-WUS; andbegin monitoring a physical downlink control channel (PDCCH) using the MR after waking up the MR.4.The method of claim 1, further comprising receiving, from the base station, a message comprising the time offset.5.The method of claim 4, further comprising sending, to the base station, a minimum time gap, wherein the time offset received from the base station is greater than or equal to the minimum time gap.6.The method of claim 5, wherein the minimum time gap is for the UE to at least:process the LP-WUS upon reception by the UE using the LR;wake up the MR in response to the receiving the LP-WUS; andgenerate the ACK.7.The method of claim 5, wherein the minimum time gap is for the UE to at least:process the LP-WUS upon reception by the UE using the LR;wake up the MR in response to the receiving the LP-WUS; andbegin monitoring a physical downlink control channel (PDCCH) using the MR after waking up the MR.8.The method of claim 1, further comprising receiving, from the base station, configuration information for a physical uplink control channel (PUCCH) resource for the ACK, wherein the ACK is sent to the base station using the PUCCH resource.9.The method of claim 1, further comprising receiving, from the base station, configuration information for periodic scheduling request (SR) resources, wherein the ACK is sent to the base station in a first SR resource of the periodic SR resources.10.The method of claim 9, wherein the ACK uses a cyclic shift that indicates that the ACK is for acknowledging the LP-WUS.11.A method of a base station, comprising:sending, to a user equipment (UE) , a low-power wake-up signal (LP-WUS) at a first time;identifying a time offset between the LP-WUS and an acknowledgement (ACK) of the LP-WUS;receiving, from the UE, the ACK at a second time that follows the first time by the time offset.12.The method of claim 11, wherein the time offset is greater than or equal to a minimum time gap that is for the UE to at least:process the LP-WUS upon reception by the UE using a low-power receiver (LR) of the UE;wake up a main radio (MR) of the UE in response to the receiving the LP-WUS; andgenerate the ACK.13.The method of claim 11, wherein the time offset is greater than or equal to a minimum time gap that is for the UE to at least:process the LP-WUS upon reception by the UE using a low-power receiver (LR) of the UE;wake up a main radio (MR) of the UE in response to the receiving the LP-WUS; andbegin monitoring a physical downlink control channel (PDCCH) using the MR after waking up the MR.14.The method of claim 11, further comprising sending, to the UE, a message comprising the time offset.15.The method of claim 14, further comprising receiving, from the UE, a minimum time gap, and wherein the time offset is identified by the base station to be greater than or equal to the minimum time gap.16.The method of claim 15, wherein the minimum time gap is for the UE to at least:process the LP-WUS upon reception by the UE using a low-power receiver (LR) of the UE;wake up a main radio (MR) of the UE in response to the receiving the LP-WUS; andgenerate the ACK.17.The method of claim 15, wherein the minimum time gap is for the UE to at least:process the LP-WUS upon reception by the UE using a low-power receiver (LR) of the UE;wake up a main radio (MR) of the UE in response to the receiving the LP-WUS; andbegin monitoring a physical downlink control channel (PDCCH) using the MR after waking up the MR.18.The method of claim 11, further comprising sending, to the UE, configuration information for a physical uplink control channel (PUCCH) resource for the ACK, wherein the ACK is received from the UE in the PUCCH resource.19.The method of claim 11, further comprising sending, to the UE, configuration information for periodic scheduling request (SR) resources, wherein the ACK is received from the UE in a first SR resource of the periodic SR resources.20.The method of claim 19, wherein the ACK uses a cyclic shift that indicates that the ACK is for acknowledging the LP-WUS.21.A method of a base station, comprising:transmitting a low-power wake-up signal (LP-WUS) to a user equipment (UE) in a first monitoring occasion (MO) ;determining that the UE did not accurately receive the LP-WUS in the first MO; andretransmitting the LP-WUS to the UE in a second MO in response to the determining that the UE did not accurately receive the LP-WUS in the first MO.22.The method of claim 21, wherein the determining that the UE did not accurately receive the LP-WUS in the first MO comprises identifying that an expected acknowledgment (ACK) of the LP-WUS was not received from the UE.23.The method of claim 21, wherein the determining that the UE did not accurately receive the LP-WUS in the first MO comprises identifying that the UE is not receiving or transmitting using resources scheduled for the UE by the base station after sending the LP-WUS.24.The method of claim 21, wherein the second MO occurs during a discontinuous reception (DRX) on cycle for the UE.25.An apparatus comprising means to perform the method of any of claim 1 to claim 24.26.A computer-readable media comprising instructions to cause an electronic device, upon execution of the instructions by one or more processors of the electronic device, to perform the method of any of claim 1 to claim 24.27.An apparatus comprising logic, modules, or circuitry to perform the method of any of claim 1 to claim 24.28.A baseband processor for a user equipment (UE) that is configured to cause the UE to perform one or more elements of any one of claim 1 to claim 10.29.A baseband processor for a base station that is configured to cause the base station to perform one or more elements of any one of claim 11 to claim 24.
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