LOW POWER MONITORING WINDOW

To facilitate operations of a low-power UE with high RF sensitivity, methods, apparatuses, and computer-readable medium are provided. An example method includes receiving, from a base station or a second UE, a reservation reserving a set of time-domain resources and a set of frequency domain resources around a WUS for a low-power UE. The example method further includes refraining from transmitting in the reserved resources.

TECHNICAL FIELD

The present disclosure relates generally to communication systems, and more particularly, to wireless communication systems with a wakeup signal (WUS) for low-power user equipment (UE).

INTRODUCTION

BRIEF SUMMARY

In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus at a UE are provided. The apparatus may include a memory and at least one processor coupled to the memory. The memory and the at least one processor coupled to the memory may be configured to receive, from a base station or a second UE, a reservation reserving a set of time-domain resources and a set of frequency domain resources around a WUS for a low-power UE. The memory and the at least one processor coupled to the memory may be further configured to refrain from transmitting in the reserved resources.

In another aspect of the disclosure, a method, a computer-readable medium, and an apparatus at a base station or a UE are provided. The apparatus may include a memory and at least one processor coupled to the memory. The memory and the at least one processor coupled to the memory may be configured to receive, from a low-power UE, a UE capability report indicating at least RF capability associated with the low-power UE. The memory and the at least one processor coupled to the memory may be further configured to transmit, to one or more UEs, a reservation reserving a set of time-domain resources and a set of frequency domain resources around a WUS for the low-power UE. The memory and the at least one processor coupled to the memory may be further configured to transmit the WUS to the low-power UE.

DETAILED DESCRIPTION

Referring again toFIG.1, in some aspects, the UE104may include an accommodation component198. In some aspects, the accommodation component198may be configured to receive, from a base station or a second UE, a reservation reserving a set of time-domain resources and a set of frequency domain resources around a WUS for a low-power UE. In some aspects, the accommodation component198may be further configured to refrain from transmitting in the reserved resources.

In certain aspects, the base station180may include a reservation component199. In some aspects, the reservation component199may be configured to receive, from a low-power UE, a UE capability report indicating at least RF capability associated with the low-power UE. In some aspects, the reservation component199may be further configured to transmit, to one or more UEs, a reservation reserving a set of time-domain resources and a set of frequency domain resources around a WUS for the low-power UE. In some aspects, the reservation component199may be further configured to transmit the WUS to the low-power UE.

In addition to higher power UEs, wireless communication may support low-power UEs. Among others, examples of higher power UEs include smartphones, V2X devices, URLLC devices, eMBB devices, or the like. Among other examples, low-power UEs may include wearables, sensors in industrial wireless sensor networks (IWSN), surveillance cameras, a passive circuit with an envelope detector, a UE that operates based on energy harvesting, or the like. For example, NR communication systems may support both higher-power UEs and lower-power UEs. Lower-power UEs may communicate based on various types of wireless communication.

A lower-power UE may have a less powerful receiver compared with a higher-power UE. Due to the less powerful receiver, a lower-power UE may monitor wakeup signal with a higher receiver reference sensitivity. For example, a higher-power UE may have a power consumption between 30 milliwatts (mW) to 50 mWs and may have a radio frequency (RF) sensitivity of about −100 decibel-milliwatts (dBm). A first type of lower-power UE (which may be referred to as “almost-zero power UE”) may have a lower power consumption and a higher RF sensitivity. For example, an example almost-zero power UE may have a power consumption of 7.4 nanowatts (nW) and a RF sensitivity of −71 dBm when operating at a 433 MHz frequency. Another example almost-zero power UE may have a power consumption of 99 microwatts (μW) and a RF sensitivity of −97 dBm when operating at a 2.4 GHz frequency. Another example almost-zero power UE may have a power consumption of 45 μW and a RF sensitivity of −87 dBm when operating at a 900 MHz frequency. A second type of lower-power UE (which may be referred to as “zero power UE”) may have a zero power consumption and operates based on energy harvesting. An example zero power UE may have a RF sensitivity of −20 dBm or higher.

In addition to higher RF sensitivity, a lower-power UE may also have reduced transmission bandwidth or reception bandwidth than other UEs. For instance, a low-power UE may have a limited bandwidth of 20 MHz BWP in FR1 and/or 100 MHz in FR2. In some aspects, the lower-power UE may have an operating bandwidth between 5 MHz and 20 MHz for both transmission and reception, in contrast to other UEs which may have a bandwidth of up to 100 MHz or more than 100 MHz. As a further example, a lower-power UE may have a reduced number of reception antennas (e.g., 2 reception antennas) in comparison to other UEs that may have a larger number of reception antennas.

A WUS may be used to wake a UE from an idle state and the UE may accordingly prepare to receive a data transmission. A WUS may be an indication sent to the UE so that the UE may start monitoring one or more channels to receive paging. By entering into an idle state, a UE may save resources such as power and energy while remaining available for communication. A WUS mechanism may be used in connection with discontinuous reception (DRX) framework. For example, under a DRX framework, a UE may periodically wakeup to receive data. As an example, a UE may be configured by a base station for DRX. During an RRC connected state, when there is no data transmission in either direction (UL/DL), the UE may operate using the DRX mode. In the DRX mode, the UE starts monitoring the PDCCH channel discontinuously using a sleep and wake cycle. DRX conserves battery power at the UE. In a non-DRX mode, the UE monitors for PDCCH in each subframe to check whether there is downlink data available. Continuous monitoring of the PDCCH drains the UE's battery power. A DRX cycle may include a periodic repetition of an on duration in which the UE monitors for PDCCH from the base station and an off duration during which the UE may skip monitoring for the PDCCH. During the DRX off duration, the UE may enter a sleep mode or a low power mode in which the UE minimizes power consumption by shutting down a radio frequency (RF) function without detecting communication from the base station. Although aspects are described for a UE and a base station, a UE may similarly apply DRX for sidelink communication.

A base station may use a WUS to indicate to the UE whether there is a data packet or a paging message for the UE. If there is no data packet or no paging message for the UE to receive, e.g., as indicated by the absence of a WUS, the UE will not wakeup and may skip a DRX wakeup period to further save energy. Thus, the UE may skip wakeups when there is no data packet or paging message arrival, and the UE may proceed with extended sleep durations to save energy.

Because a lower-power UE may have a higher RF sensitivity, a WUS for a lower-power UE may be much more sensitive with interference compared with a RS for a higher-power UE. Example aspects are provided herein to resolve the potential interference issue and provide more reliable WUS for lower-power UEs by blanking the resource(s) around the WUS to avoid power leakage on the WUS from adjacent RBs. For example, other UEs that are connected to a same base station as a lower-power UE may receive from the base station or another UE, a reservation reserving a set of time-domain resources and a set of frequency domain resources around a WUS for a lower-power UE. The other UEs may accordingly refrain from transmitting in the reserved resources, therefore blanking the resources (e.g., the set of time-domain resources and the set of frequency domain resources) around the WUS to avoid power leakage on the WUS from adjacent RBs. The term “blank” may be used to refer to causing UEs and base stations to refrain from transmitting in certain resources, such as resources around the WUS.

FIG.4illustrates an example of wireless communication systems400, in accordance with aspects of the present disclosure. The wireless communication system400includes a base station402and UEs404a,404, and404c. In the illustrated example, the base station402may establish respective communication links406a,406b,406cwith the UEs404a,404b,404c.

Due to an issue, such as blockage or fading, the communication link406abetween the base station402and the first (or target) UE404amay be degraded, fail, or be dropped. Accordingly, the base station402may leverage sidelink channels (e.g., a sidelink channel408) to communicate with the target UE404a. In the illustrated example ofFIG.4, the base station402may determine that the second UE404b(or other TRP) is in, or near, a helping group of devices that are able to facilitate communication between the base station402and the target UE404a. Accordingly, inFIG.4, the second UE404bmay help or assist the target UE404aby forwarding or retransmitting data received from the base station402to the target UE404athrough the sidelink408.

In some examples, to facilitate communication between the base station402and the target UE404a, the base station402may transmit communication to one or more UEs404band404cnear the target UE404afor relaying the communication to the target UE404aover a sidelink. For a target UE404ato receive a reservation reserving a set of time-domain resources and a set of frequency domain resources around a WUS for a low-power UE, the target UE404amay receive the reservation from the UE404a/404bor from the base station402. There may be two sidelink resource allocation modes. In a first sidelink resource allocation mode, a UE may receive a resource allocation for sidelink communication from a central entity, such as the base station402. The sidelink resource allocation that includes receiving allocation from a base station may be referred to as “resource allocation mode 1” or a “centralized” resource allocation mode, e.g., in which a network entity allocates sidelink resources for multiple UEs. In a second resource allocation mode, a UE may autonomously determine resources for sidelink transmissions by sensing, or monitoring, for reservations of other UEs. The autonomous resource selection may be referred to as “resource allocation mode 2,” a “decentralized” resource allocation mode, or a sensing-based sidelink resource allocation mode, e.g., where each UE selects its own sidelink resources for sidelink transmissions. In the decentralized sidelink resource allocation mode, rather than receiving an allocation of sidelink resources from a network entity, a UE may determine the sidelink transmission resource(s) based on a sensing and resource reservation procedure. As one example, in resource allocation mode 1, the target UE404amay reservation reserving a set of time-domain resources and a set of frequency domain resources around a WUS for a low-power UE from another UE, such as the UE404bor the UE404c. As another example, in resource allocation mode 2, the target UE404amay reservation reserving a set of time-domain resources and a set of frequency domain resources around a WUS for a low-power UE from the base station402.

FIG.5illustrates an example communication flow500between UEs502and502N, a low-power UE506, and a base station504. In some aspects, the UE502may be in communication with the UE502N via sidelink. In some aspects, the UE502N may be not in communication with the UE502via sidelink and the UE502N may be in communication with the base station504directly. In some aspects, the low-power UE506may be an almost zero power UE or a zero power UE as previously described. As illustrated inFIG.5, the low-power UE506may transmit a capability report508to the base station504, such as by transmitting a capability report508upon establishing a radio resource control (RRC) connection with the base station504. In some aspects, the capability report508may be forward by the base station504to one or more sidelink relaying UEs, such as the UE502. The capability report508may indicate RF capability of the low-power UE506. For example, the capability report508may indicate that the low-power UE506is a low-power UE with higher RF sensitivity. The capability report508may further include other capability information, such as RF related parameters, physical layer related parameters, medium access control (MAC) related parameters, capability band, UE category (such as low-power or not), UE supported features, radio resource management (RRM) measurement related parameters, or the like. The low-power UE506may enter an idle state some point after establishing connection with the base station504and transmitting the capability report508.

After receiving the capability report508and after determining data to be transmitted to the low-power UE506, the base station504may transmit a reservation510for blanking resource(s) around a WUS for the low-power UE506to one or more UEs that the base station is in communication with, such as the UE502and the UE502N. The reservation510may be transmitted via PDCCH. The reservation512may reserve resources so that the resources may be blanked around a WUS resource. For example, the reservation510may reserve to blank an entire frequency band around a WUS. In another example, the reservation the reservation510may reserve to blank a partial frequency band around a WUS. As two examples,FIGS.6A and6Billustrate example blanking of resource(s) around WUS in DL. In example600ofFIG.6A, the reservation510in PDCCH may reserve to blank an entire frequency band around a WUS. In example650ofFIG.6B, the reservation510in PDCCH may reserve to blank a partial frequency band around a WUS. As illustrated inFIGS.6A and6BandFIGS.7A and7B, a WUS may be transmitted in repetition in order to accumulate the received power to guarantee the received signal strength. In some aspects, WUS may be transmitted similar to transmission of CSI-RS. In some aspects, the number of repetitions may be configurable and the reservation may reserve multiple consecutive or non-consecutive symbols near the WUS.

In some aspects, the reservation510may reserve resources with flexible granularity in the frequency domain where a defined set of frequency resources that is not a full band or a half band may be reserved. For example, the reservation510may reserve a defined set of frequency resources around the WUS. In addition, the reservation510may also include an indication of the WUS and an associated RRC configuration including periodicity, RS pattern, or the like. In some aspects, the reservation510may indicate a time-domain of the reserved resources via a bitmap. For example, a bitmap including one or more pre-emption indication (PI) where each PI include a number of bits and each bit representing one symbol may be used. The bitmap may be similar to a bitmap in DCI format 2_1 with DL PIs. In another example, a bitmap including one or more bits where each bit of the one or more bits representing a number of symbols may be used. The symbol(s) represented by each bit may be one symbol or one or more consecutive or defined non-consecutive symbols. In some aspects, the time-domain of the reserved resources may be represented by a starting symbol and one or more reserved symbol numbers representing reserved symbols in the reservation510. In some aspects, the reservation510may indicate a frequency-domain of the reserved resources via a bitmap. In some aspects, the bitmap may not be used because the entire band may be reserved.

In some aspects where the UE502N is connected to the UE502via sidelink and where resource allocation mode 2 is used, the UE502may transmit a reservation512for blanking resource(s) around a WUS for the low-power UE506to one or more UEs, such as the UE502N, or the base station504. The reservation512may be transmitted via PSCCH. The reservation512may reserve resources so that the resources may be blanked around a WUS resource. For example, the reservation512may reserve to blank an entire frequency band around a WUS. In another example, the reservation the reservation512may reserve to blank a partial frequency band around a WUS. As two examples,FIGS.7A and7Billustrate example blanking of resource(s) around WUS in SL. In example700ofFIG.7A, the reservation512in PSCCH may reserve to blank an entire frequency band around a WUS. In example750ofFIG.7B, the reservation512in PSCCH may reserve to blank a partial frequency band around a WUS. In some aspects, the reservation512may reserve resources with flexible granularity in the frequency domain where a defined set of frequency resources that is not a full band or a half band may be reserved. For example, the reservation512may reserve a defined set of frequency resources around the WUS. In addition, the reservation512may also include an indication of the WUS and an associated RRC configuration including periodicity, RS pattern, or the like.

In some aspects, the reservation512may indicate a time-domain of the reserved resources via a bitmap. For example, a bitmap including one or more PIs where each PI include a number of bits and each bit representing one symbol may be used. The bitmap may be similar to a bitmap in DCI format 2_1 with DL PIs. In another example, a bitmap including one or more bits where each bit of the one or more bits representing a number of symbols may be used. The symbol(s) represented by each bit may be one symbol or one or more consecutive or defined non-consecutive symbols. In some aspects, the time-domain of the reserved resources may be represented by a starting symbol and one or more reserved symbol numbers representing reserved symbols in the reservation512. In some aspects, the reservation512may indicate a frequency-domain of the reserved resources via a bitmap. In some aspects, the bitmap may not be used because the entire band may be reserved.

In some aspects where the UE502N is connected to the UE502via sidelink and where resource allocation mode 1 is used, the base station504may still transmit reservation510to the UE502and the UE502N. As illustrated inFIGS.7A and7B, the reservation510in PDCCH may reserve to blank a partial frequency band around a WUS in example750or may reserve to blank an entire frequency band in example700.

After receiving the reservation510or the reservation512, the UE502N or the UE502may blank resources around the WUS at514. The low-power UE506may receive the WUS516from the base station504or the UE502. In some aspects, for SL, no reservation510or reservation512may be transmitted and a defined set of resources around the WUS may be reserved. The UEs502and502N, the base station504, or the low-power UE506may be aware of the defined set of resources beforehand. For example, the defined set of resources may be a defined frequency range (such as an entire band or part of a band) associated with one or more defined symbols in a slot, such as a last symbol, a first symbol, one or more symbols around a DL/UP gap, or the like.

In some aspects, the reservation512may reserve the resources as “not recommended” and a UE may deviate from the reservation512. For example, even after the UE502N receives a reservation512to blank resource(s) around a WUS, the UE502N may still transmit in the “not recommended” resources around a WUS at518.

FIG.8is a flowchart800of a method of wireless communication. The method may be performed by a UE (e.g., the UE104, the UE502N; the apparatus1002). The method may be used for blanking resource(s) around WUS to avoid power leakage from adjacent RBs to facilitate more efficient operations of a low-power UE.

At802, the UE may receive, from a base station or a second UE, a reservation reserving a set of time-domain resources and a set of frequency domain resources around a WUS for a low-power UE. For example, the UE502N may receive, from a base station504or a second UE502, a reservation510or512reserving a set of time-domain resources and a set of frequency domain resources around a WUS516for a low-power UE506. In some aspects,802may be performed by reservation component1042inFIG.10.

At804, the UE may refrain from transmitting in the reserved resources. For example, the UE502N may refrain from transmitting in the reserved resources at514. In some aspects,804may be performed by refrain component1044inFIG.10.

FIG.9is a flowchart900of a method of wireless communication. The method may be performed by a UE (e.g., the UE104, the UE502N; the apparatus1002). The method may be used for blanking resource(s) around WUS to avoid power leakage from adjacent RBs to facilitate more efficient operations of a low-power UE.

At902, the UE may receive, from a base station or a second UE, a reservation reserving a set of time-domain resources and a set of frequency domain resources around a WUS for a low-power UE. For example, the UE502N may receive, from a base station504or a second UE502, a reservation510or512reserving a set of time-domain resources and a set of frequency domain resources around a WUS516for a low-power UE506. In some aspects,902may be performed by reservation component1042inFIG.10. In some aspects, the set of time domain resources is represented by a bitmap in the reservation. In some aspects, the bitmap includes one or more PI, each PI including X number of bits, X being a positive integer, each bit representing one symbol. In some aspects, the bitmap includes one or more bits, each bit of the one or more bits representing X consecutive or non-consecutive symbols, X being an integer greater than or equal to one. In some aspects, the set of time domain resources is represented by a starting symbol and one or more reserved symbol numbers representing reserved symbols. In some aspects, the set of frequency domain resources includes an active BWP associated with the WUS. In some aspects, the set of frequency domain resources includes one or more sub-bands in an active BWP associated with the WUS, and the one or more sub-bands may be represented by a bitmap in the reservation. In some aspects, the reservation reserves a defined set of resources associated with the WUS. In some aspects, the defined set of resources includes one or more defined symbols, such as a last symbol, a first symbol, or one or more symbols around a gap, of a slot associated with the WUS. In some aspects, the reservation is received from the second UE via a PSCCH. In some aspects, the reservation is received from the base station via a PDCCH. In some aspects, the reservation is for blanking the set of time-domain resources and the set of frequency-domain resources around the WUS to avoid power leakage from adjacent RBs.

At904, the UE may refrain from transmitting in the reserved resources. For example, the UE502N may refrain from transmitting in the reserved resources at514. In some aspects,904may be performed by refrain component1044inFIG.10.

In some aspects, the reservation labels the reserved resources as not recommended, and the UE may transmit in the reserved resources at906. For example, the UE502N may transmit in the reserved resources at518.

FIG.10is a diagram1000illustrating an example of a hardware implementation for an apparatus1002. The apparatus1002may be a UE, a component of a UE, or may implement UE functionality. In some aspects, the apparatus1002may include a cellular baseband processor1004(also referred to as a modem) coupled to a cellular RF transceiver1022. In some aspects, the apparatus1002may further include one or more subscriber identity modules (SIM) cards1020, an application processor1006coupled to a secure digital (SD) card1008and a screen1010, a Bluetooth module1012, a wireless local area network (WLAN) module1014, a Global Positioning System (GPS) module1016, or a power supply1018. The cellular baseband processor1004communicates through the cellular RF transceiver1022with the UE104and/or BS102/180. The cellular baseband processor1004may include a computer-readable medium/memory. The computer-readable medium/memory may be non-transitory. The cellular baseband processor1004is responsible for general processing, including the execution of software stored on the computer-readable medium/memory. The software, when executed by the cellular baseband processor1004, causes the cellular baseband processor1004to perform the various functions described supra. The computer-readable medium/memory may also be used for storing data that is manipulated by the cellular baseband processor1004when executing software. The cellular baseband processor1004further includes a reception component1030, a communication manager1032, and a transmission component1034. The communication manager1032includes the one or more illustrated components. The components within the communication manager1032may be stored in the computer-readable medium/memory and/or configured as hardware within the cellular baseband processor1004. The cellular baseband processor1004may be a component of the UE350and may include the memory360and/or at least one of the TX processor368, the RX processor356, and the controller/processor359. In one configuration, the apparatus1002may be a modem chip and include just the cellular baseband processor1004, and in another configuration, the apparatus1002may be the entire UE (e.g., see350ofFIG.3) and include the additional modules of the apparatus1002.

The communication manager1032may include a reservation component1042that is configured to receive, from a base station or a second UE, a reservation reserving a set of time-domain resources and a set of frequency domain resources around a WUS for a low-power UE, e.g., as described in connection with802inFIGS.8and902inFIG.9. The communication manager1032may further include a refrain component1044that may be configured to refrain from transmitting in the reserved resources, e.g., as described in connection with804inFIGS.8and904inFIG.9.

As shown, the apparatus1002may include a variety of components configured for various functions. In one configuration, the apparatus1002, and in particular the cellular baseband processor1004, may include means for receiving, from a base station or a second UE, a reservation reserving a set of time-domain resources and a set of frequency domain resources around a WUS for a low-power UE. The cellular base band processor1004may further include means for refraining from transmitting in the reserved resources. The cellular baseband processor1004may further include means for transmitting in the reserved resources. The means may be one or more of the components of the apparatus1002configured to perform the functions recited by the means. As described supra, the apparatus1002may include the TX Processor368, the RX Processor356, and the controller/processor359. As such, in one configuration, the means may be the TX Processor368, the RX Processor356, and the controller/processor359configured to perform the functions recited by the means.

FIG.11is a flowchart1100of a method of wireless communication. The method may be performed by a base station or a UE (e.g., the base station102/180, the base station504, the UE502; the apparatus1302). The method may be used for blanking resource(s) around WUS to avoid power leakage from adjacent RBs to facilitate more efficient operations of a low-power UE.

At1102, the base station or UE may receive, from a low-power UE, a UE capability report indicating at least RF capability associated with the low-power UE. For example, the base station504may receive, from a low-power UE502, a UE capability report508indicating at least RF capability associated with the low-power UE. In some aspects,1102may be performed by capability component1342inFIG.13.

At1104, the base station may transmit, to one or more UEs, a reservation reserving a set of time-domain resources and a set of frequency domain resources around a WUS for the low-power UE. For example, the base station504or the UE502may transmit, to one or more UEs502N, a reservation510or512reserving a set of time-domain resources and a set of frequency domain resources around a WUS516for the low-power UE506. In some aspects,1104may be performed by reservation component1344inFIG.13.

At1106, the base station or the UE may transmit the WUS to the low-power UE. For example, the base station504or the UE502may transmit the WUS516to the low-power UE506. In some aspects,1106may be performed by WUS component1346inFIG.13.

FIG.12is a flowchart1200of a method of wireless communication. The method may be performed by a base station or a UE (e.g., the base station102/180, the base station504, the UE502; the apparatus1302). The method may be used for blanking resource(s) around WUS to avoid power leakage from adjacent RBs to facilitate more efficient operations of a low-power UE.

At1202, the base station or UE may receive, from a low-power UE, a UE capability report indicating at least RF capability associated with the low-power UE. For example, the base station504may receive, from a low-power UE502, a UE capability report508indicating at least RF capability associated with the low-power UE. In some aspects,1202may be performed by capability component1342inFIG.13.

At1204, the base station may transmit, to one or more UEs, a reservation reserving a set of time-domain resources and a set of frequency domain resources around a WUS for the low-power UE. For example, the base station504or the UE502may transmit, to one or more UEs502N, a reservation510or512reserving a set of time-domain resources and a set of frequency domain resources around a WUS516for the low-power UE506. In some aspects,1204may be performed by reservation component1344inFIG.13. In some aspects, the set of time domain resources is represented by a bitmap in the reservation. In some aspects, the bitmap includes one or more PI, each PI including X number of bits, X being a positive integer, each bit representing one symbol. In some aspects, the bitmap includes one or more bits, each bit of the one or more bits representing X consecutive or non-consecutive symbols, X being an integer greater than or equal to one. In some aspects, the set of time domain resources is represented by a starting symbol and one or more reserved symbol numbers representing reserved symbols. In some aspects, the set of frequency domain resources includes an active BWP associated with the WUS. In some aspects, the set of frequency domain resources includes one or more sub-bands in an active BWP associated with the WUS, and the one or more sub-bands may be represented by a bitmap in the reservation. In some aspects, the reservation reserves a defined set of resources associated with the WUS. In some aspects, the defined set of resources includes one or more defined symbols, such as a last symbol, a first symbol, or one or more symbols around a gap, of a slot associated with the WUS. In some aspects, the reservation is transmitted via a PSCCH. In some aspects, the reservation is tranmitted via a PDCCH. In some aspects, the reservation is for blanking the set of time-domain resources and the set of frequency-domain resources around the WUS to avoid power leakage from adjacent RBs.

At1206, the base station or the UE may transmit the WUS to the low-power UE. For example, the base station504or the UE502may transmit the WUS516to the low-power UE506. In some aspects,1206may be performed by WUS component1346inFIG.13.

In some aspects, the reservation labels the reserved resources as not recommended, and the UE may receive in the reserved resources at1208. For example, the base station504may receive in the reserved resources at518.

FIG.13is a diagram1300illustrating an example of a hardware implementation for an apparatus1302. The apparatus1302may be a base station, a component of a base station, or may implement base station functionality. In some aspects, the apparatus1002may include a baseband unit1304. The baseband unit1304may communicate through a cellular RF transceiver1322with the UE104. The baseband unit1304may include a computer-readable medium/memory. The baseband unit1304is responsible for general processing, including the execution of software stored on the computer-readable medium/memory. The software, when executed by the baseband unit1304, causes the baseband unit1304to perform the various functions described supra. The computer-readable medium/memory may also be used for storing data that is manipulated by the baseband unit1304when executing software. The baseband unit1304further includes a reception component1330, a communication manager1332, and a transmission component1334. The communication manager1332includes the one or more illustrated components. The components within the communication manager1332may be stored in the computer-readable medium/memory and/or configured as hardware within the baseband unit1304. The baseband unit1304may be a component of the base station310and may include the memory376and/or at least one of the TX processor316, the RX processor370, and the controller/processor375.

The communication manager1332may include a capability component1342that may receive, from a low-power UE, a UE capability report indicating at least RF capability associated with the low-power UE, e.g., as described in connection with1102inFIGS.11and1202inFIG.12. The communication manager1332may further include a reservation component1344that may transmit, to one or more UEs, a reservation reserving a set of time-domain resources and a set of frequency domain resources around a WUS for the low-power UE, e.g., as described in connection with1104inFIGS.11and1204inFIG.12. The communication manager1332may further include a reservation component1344that may transmit the WUS to the low-power UE, e.g., as described in connection with1106inFIGS.11and1206inFIG.12.

As shown, the apparatus1302may include a variety of components configured for various functions. In one configuration, the apparatus1302, and in particular the baseband unit1304, may include means for receiving, from a low-power UE, a UE capability report indicating at least RF capability associated with the low-power UE. The baseband unit1304may further include means for transmitting, to one or more UEs, a reservation reserving a set of time-domain resources and a set of frequency domain resources around a WUS for the low-power UE. The baseband unit1304may further include means for transmitting the WUS to the low-power UE. The baseband unit1304may further include means for receiving in the reserved resources. The means may be one or more of the components of the apparatus1302configured to perform the functions recited by the means. As described supra, the apparatus1302may include the TX Processor316, the RX Processor370, and the controller/processor375. As such, in one configuration, the means may be the TX Processor316, the RX Processor370, and the controller/processor375configured to perform the functions recited by the means.

FIG.14includes diagrams1400and1410illustrating example aspects of slot structures that may be used for sidelink communication (e.g., between UEs104, RSU107, etc.). The slot structure may be within a 5G/NR frame structure in some examples. In other examples, the slot structure may be within an LTE frame structure. Although the following description may be focused on 5G NR, the concepts described herein may be applicable to other similar areas, such as LTE, LTE-A, CDMA, GSM, and other wireless technologies. The example slot structure inFIG.14is merely one example, and other sidelink communication may have a different frame structure and/or different channels for sidelink communication. A frame (10 ms) may be divided into 10 equally sized subframes (1 ms). Each subframe may include one or more time slots. Subframes may also include mini-slots, which may include 7, 4, or 2 symbols. Each slot may include 7 or 14 symbols, depending on the slot configuration. For slot configuration 0, each slot may include 14 symbols, and for slot configuration 1, each slot may include 7 symbols. Diagram1400illustrates a single resource block of a single slot transmission, e.g., which may correspond to a 0.5 ms transmission time interval (TTI). A physical sidelink control channel may be configured to occupy multiple physical resource blocks (PRBs), e.g., 10, 12, 15, 20, or 25 PRBs. The PSCCH may be limited to a single sub-channel. A PSCCH duration may be configured to be 2 symbols or 3 symbols, for example. A sub-channel may comprise 10, 15, 20, 25, 50, 75, or 100 PRBs, for example. The resources for a sidelink transmission may be selected from a resource pool including one or more subchannels. As a non-limiting example, the resource pool may include between 1-27 subchannels. A PSCCH size may be established for a resource pool, e.g., as between 10-100% of one subchannel for a duration of 2 symbols or 3 symbols. The diagram1410inFIG.14illustrates an example in which the PSCCH occupies about 50% of a subchannel, as one example to illustrate the concept of PSCCH occupying a portion of a subchannel. The physical sidelink shared channel (PSSCH) occupies at least one subchannel. The PSCCH may include a first portion of sidelink control information (SCI), and the PSSCH may include a second portion of SCI in some examples.

A resource grid may be used to represent the frame structure. Each time slot may include a resource block (RB) (also referred to as physical RBs (PRBs)) that extends 12 consecutive subcarriers. The resource grid is divided into multiple resource elements (REs). The number of bits carried by each RE depends on the modulation scheme. As illustrated inFIG.14, some of the REs may include control information in PSCCH and some REs may include demodulation RS (DMRS). At least one symbol may be used for feedback.FIG.14illustrates examples with two symbols for a physical sidelink feedback channel (PSFCH) with adjacent gap symbols. A symbol prior to and/or after the feedback may be used for turnaround between reception of data and transmission of the feedback. The gap enables a device to switch from operating as a transmitting device to prepare to operate as a receiving device, e.g., in the following slot. Data may be transmitted in the remaining REs, as illustrated. The data may comprise the data message described herein. The position of any of the data, DMRS, SCI, feedback, gap symbols, and/or LBT symbols may be different than the example illustrated inFIG.14. Multiple slots may be aggregated together in some aspects.

Aspect 1 is an apparatus for wireless communication at a UE, including: a memory; and at least one processor coupled to the memory and configured to: receive, from a base station or a second UE, a reservation reserving a set of time-domain resources and a set of frequency domain resources around a WUS for a low-power UE; and refrain from transmitting in the reserved resources.

Aspect 2 is the apparatus of aspect 1, wherein the set of time domain resources is represented by a bitmap in the reservation.

Aspect 3 is the apparatus of any of aspects 1-2, wherein the bitmap includes one or more PI, each PI including X number of bits, X being a positive integer, each bit representing one symbol.

Aspect 4 is the apparatus of any of aspects 1-2, wherein the bitmap includes one or more bits, each bit of the one or more bits representing X symbols, X being an integer greater than or equal to one.

Aspect 5 is the apparatus of any of aspects 1-2, wherein the set of time domain resources is represented by a starting symbol and one or more reserved symbol numbers representing reserved symbols.

Aspect 6 is the apparatus of any of aspects 1-5, wherein the set of frequency domain resources includes an active BWP associated with the WUS.

Aspect 7 is the apparatus of any of aspects 1-5, wherein the set of frequency domain resources includes one or more sub-bands in an active BWP associated with the WUS, and the one or more sub-bands represented by a bitmap in the reservation.

Aspect 8 is the apparatus of any of aspects 1-7, wherein the reservation reserves a defined set of resources associated with the WUS.

Aspect 9 is the apparatus of any of aspects 1-8, wherein the defined set of resources includes a defined symbol of a slot associated with the WUS.

Aspect 10 is the apparatus of any of aspects 1-9, wherein the reservation labels the reserved resources as not recommended, and wherein the at least one processor is further configured to: transmit in the reserved resources.

Aspect 11 is the apparatus of any of aspects 1-10, wherein the reservation is received from the second UE via a PSCCH.

Aspect 12 is the apparatus of any of aspects 1-10, wherein the reservation is received from the base station via a PDCCH.

Aspect 13 is the apparatus of any of aspects 1-12, wherein the reservation is for blanking the set of time-domain resources and the set of frequency-domain resources around the WUS to avoid power leakage from adjacent RBs.

Aspect 14 is the apparatus of any of aspects 1-13, further including a transceiver.

Aspect 15 is an apparatus for wireless communication at a relaying UE or a base station, including: a memory; and at least one processor coupled to the memory and configured to: receive, from a low-power UE, a UE capability report indicating at least RF capability associated with the low-power UE; transmit, to one or more UEs, a reservation reserving a set of time-domain resources and a set of frequency domain resources around a WUS for the low-power UE; and transmit the WUS to the low-power UE.

Aspect 16 is the apparatus of aspect 15, wherein the set of time domain resources is represented by a bitmap in the reservation.

Aspect 17 is the apparatus of any of aspects 15-16, wherein the bitmap includes one or more PI, each PI including X number of bits, X being a positive integer, each bit representing one symbol.

Aspect 18 is the apparatus of any of aspects 15-16, wherein the bitmap includes one or more bits, each bit of the one or more bits representing X symbols, X being an integer greater than or equal to one.

Aspect 19 is the apparatus of any of aspects 15-16, wherein the set of time domain resources is represented by a starting symbol and one or more reserved symbol numbers representing reserved symbols.

Aspect 20 is the apparatus of any of aspects 15-19, wherein the set of frequency domain resources includes an active BWP associated with the WUS.

Aspect 21 is the apparatus of any of aspects 15-19, wherein the set of frequency domain resources includes one or more sub-bands in an active BWP associated with the WUS, and the one or more sub-bands represented by a bitmap in the reservation.

Aspect 22 is the apparatus of any of aspects 15-21, wherein the reservation reserves a defined set of resources associated with the WUS.

Aspect 23 is the apparatus of any of aspects 15-22, wherein the defined set of resources includes a defined symbol of a slot associated with the WUS.

Aspect 24 is the apparatus of any of aspects 15-23, wherein the reservation labels the reserved resources as not recommended, and wherein the at least one processor is further configured to: receive in the reserved resources.

Aspect 25 is the apparatus of any of aspects 15-24, wherein the reservation is transmitted via a PSCCH.

Aspect 26 is the apparatus of any of aspects 15-25, wherein the reservation is transmitted via a PDCCH.

Aspect 27 is the apparatus of any of aspects 15-26, wherein the reservation is for blanking the set of time-domain resources and the set of frequency-domain resources around the WUS to avoid power leakage from adjacent RBs.

Aspect 28 is the apparatus of any of aspects 15-27, further including a transceiver.

Aspect 29 is a method of wireless communication for implementing any of aspects 1 to 14.

Aspect 30 is an apparatus for wireless communication including means for implementing any of aspects 1 to 14.

Aspect 31 is a computer-readable medium storing computer executable code, where the code when executed by a processor causes the processor to implement any of aspects 1 to 14.

Aspect 32 is a method of wireless communication for implementing any of aspects 15 to 28.

Aspect 33 is an apparatus for wireless communication including means for implementing any of aspects 15 to 28.