Patent Description:
As the demand for mobile broadband access continues to increase, further improvements in LTE, NR, and other radio access technologies and the telecommunication standards that employ these technologies remain useful.

<CIT> proposes the use of high priority messages and/or indications. A safety car (police, medical and/or other) may transmit emergency messages and/or indications to other cars. A UE may indicate to one or more other UEs one or more of the following: that the other UEs are to "mute" transmission, that the other UEs are to exclude certain resources from candidate resources, that the other UEs are to stop transmission on indicated resources during a time interval.

3GPP Tdoc R2-<NUM> discloses that in general, the UE can perform CBR measurement on the pools if they are configured towards the UE, no matter the resource pool is configured via SIB when the UE is in RRC idle mode or dedicated signaling when the UE is in RRC connected mode. Further, it is proposed that both, event based triggering of CBR report and periodical CBR report, can be supported in NR V2X.

Advantageous embodiments are subject to the dependent claims.

In the following, each of the described methods, apparatuses, systems, examples and aspects, which does not fully correspond to the invention as defined in the appended claims, is thus not according to the invention and is, as well as the whole following description, present for illustration purposes only or to highlight specific aspects or features of the appended claims.

Each of the figures is provided for the purposes of illustration and description.

The BSs may also communicate with one another, e.g., directly or indirectly, via a wireless or wireline backhaul.

For example, the UEs <NUM> may communicate using peer-to-peer (P2P) communications, device-to-device (D2D) communications, a vehicle-to-everything (V2X) protocol (e.g., which may include a vehicle-to-vehicle (V2V) protocol, a vehicle-to-infrastructure (V2I) protocol, a vehicle-to-pedestrian (V2P) protocol, a vehicle-to-network (V2N) protocol, and/or the like), a mesh network, and/or the like.

Furthermore, in some aspects, the UE <NUM> may perform operations that relate to sidelink resource selection assistance and paging. For example, as described in further detail elsewhere herein, the UE <NUM> may be an assisting UE <NUM> that obtains one or more measurements associated with a sidelink resource pool that includes one or more time and frequency resources allocated to sidelink transmissions to or from the UE <NUM>, and the assisting UE <NUM> may transmit sidelink signaling that includes a sidelink wakeup signaling and/or resource assistance information (RAI) indicating the one or more measurements associated with the sidelink resource pool to another (assisted) UE <NUM>. Accordingly, the assisted UE <NUM> may use the RAI and/or other information contained in the sidelink signaling (e.g., the sidelink wakeup signal) to perform one or more sidelink transmit and/or receive operations (e.g., using the RAI to select a resource to transmit information using the sidelink resource pool that includes time and frequency resources allocated to sidelink transmissions by the assisted UE <NUM>, using the sidelink wakeup signal to schedule reception of information from the assisting UE <NUM> using a sidelink resource pool that includes time and frequency resources allocated to sidelink transmissions by the assisting UE <NUM>, and/or the like).

<FIG> is a diagram illustrating an example <NUM> of a base station <NUM> in communication with a UE <NUM> in a wireless network, in accordance with various aspects of the present disclosure.

Transmit processor <NUM> may also generate reference symbols for reference signals (e.g., a cell-specific reference signal (CRS), a demodulation reference signal (DMRS), and/or the like) and synchronization signals (e.g., the primary synchronization signal (PSS) and secondary synchronization signal (SSS)).

On the uplink, at UE <NUM>, a transmit processor <NUM> may receive and process data from a data source <NUM> and control information (e.g., for reports that include RSRP, RSSI, RSRQ, CQI, and/or the like) from controller/processor <NUM>. The transceiver may be used by a processor (e.g., controller/processor <NUM>) and memory <NUM> to perform aspects of any of the methods described herein.

The transceiver may be used by a processor (e.g., controller/processor <NUM>) and memory <NUM> to perform aspects of any of the methods described herein.

Controller/processor <NUM> of base station <NUM>, controller/processor <NUM> of UE <NUM>, and/or any other component(s) of <FIG> may perform one or more techniques associated with sidelink resource selection assistance and paging, as described in more detail elsewhere herein. For example, controller/processor <NUM> of base station <NUM>, controller/processor <NUM> of UE <NUM>, and/or any other component(s) of <FIG> may perform or direct operations of, for example, process <NUM> of <FIG>, process <NUM> of <FIG>, and/or other processes as described herein. Memories <NUM> and <NUM> may store data and program codes for base station <NUM> and UE <NUM>, respectively. In some aspects, memory <NUM> and/or memory <NUM> may include a non-transitory computer-readable medium storing one or more instructions for wireless communication. For example, the one or more instructions, when executed (e.g., directly, or after compiling, converting, interpreting, and/or the like) by one or more processors of the base station <NUM> and/or the UE <NUM>, may cause the one or more processors, the UE <NUM>, and/or the base station <NUM> to perform or direct operations of, for example, process <NUM> of <FIG>, process <NUM> of <FIG>, and/or other processes as described herein. In some aspects, executing instructions may include running the instructions, converting the instructions, compiling the instructions, interpreting the instructions, and/or the like.

In some aspects, UE <NUM> may include means for obtaining one or more measurements associated with a sidelink resource pool that includes one or more time and frequency resources allocated to sidelink transmissions to or from UE <NUM>, means for transmitting, to an assisted UE <NUM>, sidelink signaling that includes signaling to wake up the assisted UE <NUM> and resource assistance information indicating the one or more measurements associated with the sidelink resource pool, and/or the like. In some aspects, such means may include one or more components of UE <NUM> described in connection with <FIG>, such as controller/processor <NUM>, transmit processor <NUM>, TX MIMO processor <NUM>, MOD <NUM>, antenna <NUM>, DEMOD <NUM>, MIMO detector <NUM>, receive processor <NUM>, and/or the like.

Additionally, or alternatively, in some aspects, UE <NUM> may include means for receiving, from an assisting UE <NUM>, sidelink signaling that includes signaling to wake up the UE <NUM> and resource assistance information indicating one or more measurements associated with a sidelink resource pool that includes one or more time and frequency resources allocated to sidelink transmissions to or from the UE <NUM>, means for performing one or more transmit or receive operations based at least in part on the sidelink signaling, and/or the like. In some aspects, such means may include one or more components of UE <NUM> described in connection with <FIG>, such as controller/processor <NUM>, transmit processor <NUM>, TX MIMO processor <NUM>, MOD <NUM>, antenna <NUM>, DEMOD <NUM>, MIMO detector <NUM>, receive processor <NUM>, and/or the like.

Each subframe may have a predetermined duration (e.g., <NUM>) and may include a set of slots (e.g., <NUM>m slots per subframe are shown in Fig. 3A, where m is a numerology used for a transmission, such as <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, and/or the like).

In some aspects, the base station may transmit the PSS, the SSS, and/or the PBCH in accordance with a synchronization communication hierarchy (e.g., a synchronization signal (SS) hierarchy) including multiple synchronization communications (e.g., SS blocks).

<FIG> shows an example slot format <NUM>.

An interlace structure may be used for each of the downlink and uplink for FDD in certain telecommunications systems (e.g., NR). For example, Q interlaces with indices of <NUM> through Q - <NUM> may be defined, where Q may be equal to <NUM>, <NUM>, <NUM>, <NUM>, or some other value. Each interlace may include slots that are spaced apart by Q frames. In particular, interlace q may include slots q, q + Q, q + 2Q, etc., where q ∈ {<NUM>,. , Q - <NUM>}.

New Radio (NR) may refer to radios configured to operate according to a new air interface (e.g., other than Orthogonal Frequency Divisional Multiple Access (OFDMA)-based air interfaces) or fixed transport layer (e.g., other than Internet Protocol (IP)). In some aspects, NR may utilize OFDM with a CP (herein referred to as cyclic prefix OFDM or CP-OFDM) and/or SC-FDM on the uplink, may utilize CP-OFDM on the downlink and include support for half-duplex operation using time division duplexing (TDD). In some aspects, NR may, for example, utilize OFDM with a CP (herein referred to as CP-OFDM) and/or discrete Fourier transform spread orthogonal frequency-division multiplexing (DFT-s-OFDM) on the uplink, may utilize CP-OFDM on the downlink and include support for half-duplex operation using TDD.

Real-world applications of such sidelink communications may include public safety, proximity services, UE-to-network relaying, vehicle-to-everything (V2X) communications, Internet of Everything (IoE) communications, IoT communications, mission-critical mesh, and/or various other suitable applications. Generally, a sidelink signal may refer to a signal communicated from one subordinate entity (e.g., UE <NUM>) to another subordinate entity (e.g., UE2) without relaying that communication through a scheduling entity (e.g., UE or BS), even though the scheduling entity may be utilized for scheduling and/or control purposes. In some aspects, the sidelink signals may be communicated using a licensed spectrum (unlike wireless local area networks, which typically use an unlicensed spectrum).

<FIG> is a diagram illustrating an example <NUM> of sidelink communications, in accordance with various aspects of the present disclosure.

As shown in <FIG>, a first UE <NUM>-<NUM> may communicate with a second UE <NUM>-<NUM> (and one or more other UEs <NUM>) via one or more sidelink channels <NUM>. The UEs <NUM>-<NUM> and <NUM>-<NUM> may communicate using the one or more sidelink channels <NUM> for P2P communications, D2D communications, V2X communications (e.g., which may include V2V communications, V2I communications, V2P communications, and/or the like), mesh networking, and/or the like. In some aspects, the UEs <NUM> (e.g., UE <NUM>-<NUM> and/or UE <NUM>-<NUM>) may correspond to one or more other UEs described elsewhere herein, such as UE <NUM>. In some aspects, the one or more sidelink channels <NUM> may use a PC5 interface and/or may operate in a high frequency band (e.g., the <NUM> band). Additionally, or alternatively, the UEs <NUM> may synchronize timing of transmission time intervals (TTIs) (e.g., frames, subframes, slots, symbols, and/or the like) using global navigation satellite system (GNSS) timing.

As further shown in <FIG>, the one or more sidelink channels <NUM> may include a physical sidelink control channel (PSCCH) <NUM>, a physical sidelink shared channel (PSSCH) <NUM>, and/or a physical sidelink feedback channel (PSFCH) <NUM>. The PSCCH <NUM> may be used to communicate control information, similar to a physical downlink control channel (PDCCH) and/or a physical uplink control channel (PUCCH) used for cellular communications with a base station <NUM> via an access link or an access channel. The PSSCH <NUM> may be used to communicate data, similar to a physical downlink shared channel (PDSCH) and/or a physical uplink shared channel (PUSCH) used for cellular communications with a base station <NUM> via an access link or an access channel. For example, the PSCCH <NUM> may carry sidelink control information (SCI) <NUM>, which may indicate various control information used for sidelink communications, such as one or more resources (e.g., time resources, frequency resources, spatial resources, and/or the like) where a transport block (TB) <NUM> may be carried on the PSSCH <NUM>. The TB <NUM> may include data. The PSFCH <NUM> may be used to communicate sidelink feedback <NUM>, such as hybrid automatic repeat request (HARQ) feedback (e.g., acknowledgement or negative acknowledgement (ACK/NACK) information), transmit power control (TPC), a scheduling request (SR), and/or the like.

In some aspects, the one or more sidelink channels <NUM> may use resource pools. For example, a scheduling assignment (e.g., included in SCI <NUM>) may be transmitted in sub-channels using specific resource blocks (RBs) across time. In some aspects, data transmissions (e.g., on the PSSCH <NUM>) associated with a scheduling assignment may occupy adjacent RBs in the same subframe as the scheduling assignment (e.g., using frequency division multiplexing). In some aspects, a scheduling assignment and associated data transmissions are not transmitted on adjacent RBs.

In some aspects, a UE <NUM> may operate using a transmission mode where resource selection and/or scheduling is performed by the UE <NUM> (e.g., rather than a base station <NUM>). In some aspects, the UE <NUM> may perform resource selection and/or scheduling by sensing channel availability for transmissions. For example, the UE <NUM> may measure a received signal strength indicator (RSSI) parameter (e.g., a sidelink-RSSI (S-RSSI) parameter) associated with various sidelink channels, may measure a reference signal received power (RSRP) parameter (e.g., a PSSCH-RSRP parameter) associated with various sidelink channels, may measure a reference signal received quality (RSRQ) parameter (e.g., a PSSCH-RSRQ parameter) associated with various sidelink channels, and/or the like, and may select a channel for transmission of a sidelink communication based at least in part on the measurement(s).

Additionally, or alternatively, the UE <NUM> may perform resource selection and/or scheduling using SCI <NUM> received in the PSCCH <NUM>, which may indicate occupied resources, channel parameters, and/or the like. Additionally, or alternatively, the UE <NUM> may perform resource selection and/or scheduling by determining a channel busy rate (CBR) associated with various sidelink channels, which may be used for rate control (e.g., by indicating a maximum number of resource blocks that the UE <NUM> can use for a particular set of subframes).

In the transmission mode where resource selection and/or scheduling is performed by a UE <NUM>, the UE <NUM> may generate sidelink grants, and may transmit the grants in SCI <NUM>. A sidelink grant may indicate, for example, one or more parameters (e.g., transmission parameters) to be used for an upcoming sidelink transmission, such as one or more resource blocks to be used for the upcoming sidelink transmission on the PSSCH <NUM> (e.g., for TBs <NUM>), one or more subframes to be used for the upcoming sidelink transmission, a modulation and coding scheme (MCS) to be used for the upcoming sidelink transmission, and/or the like. In some aspects, a UE <NUM> may generate a sidelink grant that indicates one or more parameters for semi-persistent scheduling (SPS), such as a periodicity of a sidelink transmission. Additionally, or alternatively, the UE <NUM> may generate a sidelink grant for event-driven scheduling, such as for an on-demand sidelink message.

<FIG> is a diagram illustrating an example <NUM> of sidelink communications and access link communications, in accordance with various aspects of the present disclosure.

As shown in <FIG>, a transmitter (Tx)/receiver (Rx) UE <NUM> and an Rx/Tx UE <NUM> may communicate with one another via a sidelink, as described above in connection with <FIG>. As further shown, in some sidelink modes, a base station <NUM> may communicate with the Tx/Rx UE <NUM> via a first access link. Additionally, or alternatively, in some sidelink modes, the base station <NUM> may communicate with the Rx/Tx UE <NUM> via a second access link. The Tx/Rx UE <NUM> and/or the Rx/Tx UE <NUM> may correspond to one or more UEs described elsewhere herein, such as the UE <NUM> of <FIG>. Thus, a direct link between UEs <NUM> (e.g., via a PC5 interface) may be referred to as a sidelink, and a direct link between a base station <NUM> and a UE <NUM> (e.g., via a Uu interface) may be referred to as an access link. Sidelink communications may be transmitted via the sidelink, and access link communications may be transmitted via the access link. An access link communication may be either a downlink communication (from a base station <NUM> to a UE <NUM>) or an uplink communication (from a UE <NUM> to a base station <NUM>).

Vehicle-to-everything (V2X) communication is an umbrella term that generally refers to technologies that can be used to communicate information between a vehicle equipped with suitable communication capabilities and one or more other devices. For example, V2X communication may include vehicle-to-vehicle (V2V) communication technologies that allow vehicles to communicate with one another (e.g., to support safety systems with non-line-of-sight and latency-sensitive collision avoidance capabilities), vehicle-to-pedestrian (V2P) communication technologies that allow vehicles to communicate with smartphones, connected wearable devices, and/or the like, vehicle-to-infrastructure (V2I) communication technologies that allow vehicles to communicate with external systems such as street lights, buildings, roadside units, and/or the like, vehicle-to-network (V2N) communication technologies that allow vehicles to communicate with cellular networks, and/or the like. For example, in 3GPP Release <NUM>, cellular V2X (C-V2X) was initially defined with LTE as an underlying radio access technology (RAT), and in 3GPP Release <NUM>, C-V2X functionality was expanded to provide support for communication using NR as an enabling RAT.

Accordingly, in some cases, a V2X wireless communication system may support one or more protocols (e.g., V2V, V2P, V2I, V2N, and/or the like) that enable UEs to communicate with one another directly using device-to-device communication over a PC5 interface, also known as sidelink communication, without using a base station as an intermediary (e.g., in the <NUM> spectrum dedicated to Intelligent Transport Systems (ITS)). Additionally, or alternatively, in some cases, a V2X wireless communication system may support one or more protocols (e.g., V2N) that enable UEs to communicate with a wireless wide area network (WWAN) and/or other devices in communication with the WWAN over a cellular (e.g., Uu) interface (e.g., over a licensed spectrum and/or an unlicensed spectrum).

In V2X communication systems, one challenge that may arise is that conditions of the sidelink, uplink, downlink, and/or other suitable communication channels used to carry V2X communications can vary widely and change quickly. For example, the channel conditions may vary and/or change due to the high mobility of vehicles and UEs associated with the vehicles, large variations in vehicle traffic at different times of day and/or in different locations, wide variation in topographies that the vehicles may traverse (e.g., dense urban environments, hilly environments, flat environments, and/or the like), and/or the like. Furthermore, V2X communication systems need to be highly reliable due to mission critical safety issues associated with, for example, autonomous vehicles and protecting vulnerable road users (e.g., pedestrians, cyclists, motorcyclists, or other road users that have little or no protection that would absorb energy in a collision). Accordingly, because road safety is an important concern in V2X environments, V2X environments generally need to have efficient paging mechanisms to enable devices to inform other devices about safety risks, such as a pedestrian UE following a potential collision course.

Furthermore, another challenge that may arise in a V2X communication system relates to power consumption associated with certain devices (e.g., battery-powered UEs, such as smartphones, smart watches, and/or the like), imbalanced power budgets for different device types (e.g., a pedestrian UE (P-UE) that operates on battery power may be more power-sensitive than a vehicle UE (V-UE) or an infrastructure device), and/or the like. For example, significant power may be consumed when a device performs operations to sense a resource pool to determine resource availability prior to performing a transmission (e.g., to announce presence, transmit a safety alert, and/or the like). This may lead to battery depletion, which may create safety risks and/or degraded user experience, because a device may be unable to receive V2X messages from other devices, may be unable to transmit V2X messages to other devices, and/or the like.

Some aspects described herein relate to techniques and apparatuses to provide sidelink resource selection assistance and paging (e.g., in a V2X environment). For example, in some aspects, an assisting UE (e.g., a V-UE and/or the like) that operates in an always-on mode or otherwise has a substantial power budget may provide sidelink signaling that includes resource assistance information, a sidelink wakeup signal, and/or the like to an assisted UE (e.g., a P-UE and/or the like) that has a limited power budget, periodically transitions between active and low-power modes to reduce power consumption, and/or the like. For example, in some aspects, the assisting UE may measure one or more sidelink channels (e.g., sidelink resource pools that include time and frequency resources allocated to transmissions from the assisting UE, the assisted UE, and/or the like) to obtain the resource assistance information, which may include one or more measurements that relate to congestion and/or other conditions associated with the sidelink channels based at least in part on control information that indicates channel availability, a channel busy ratio (CBR) that indicates a proportion of channel time where energy measured on the channel is above a threshold, and/or the like.

Accordingly, in some aspects, the assisting UE may transmit the sidelink signaling that includes the resource assistance information, the sidelink wakeup signal, and/or the like to the assisted UE, which may then use the resource assistance information, the sidelink wakeup signal, and/or the like to perform one or more transmit and/or receive operations. For example, the assisted UE may use the resource assistance information to select a time and frequency resource (e.g., a physical resource block (PRB)) within a sidelink resource pool to be used for a transmission by the assisted UE. Additionally, or alternatively, the sidelink wakeup signal may indicate that an upcoming transmission (e.g., a safety message) is scheduled in a resource pool allocated to transmissions by the assisting UE, whereby the assisted UE may schedule reception of the upcoming transmission by the assisting UE. In this way, the assisted UE may be provided with the resource assistance information to enable the assisted UE to select a suitable transmission resource without having to perform sensing operations to determine sidelink channel conditions prior to performing a transmission, which may enable the assisted UE to enter a low-power state or otherwise conserve power during times when the assisted UE would otherwise be measuring sidelink channel conditions. Furthermore, by including the sidelink wakeup signal in the sidelink signaling, the assisting UE may efficiently page the assisted UE in cases where there is an important transmission that the assisted UE is to receive, which may improve road safety, provide an improved user experience, and/or the like.

<FIG> are diagrams illustrating one or more examples <NUM> of sidelink resource selection assistance and paging, in accordance with various aspects of the present disclosure. As shown in <FIG>, example <NUM> which is useful for understanding the invention includes an assisting UE and an assisted UE that may be in communication over a sidelink. Furthermore, as shown in <FIG>, which is also useful for understanding the invention, and as shown in <FIG>, which is according to the invention, the assisting UE and the assisted UE may communicate over the sidelink using one or more resource pools that include time and frequency resources allocated to transmissions to and/or from the assisting UE, the assisted UE, and/or the like. For example, in some aspects, the assisting UE may be a vehicle UE (V-UE) that may operate in an always-on mode, have a substantial power budget, and/or the like, and the assisting UE may use the resource pools that include the time and frequency resources allocated to transmissions to and/or from the assisting UE to transmit sidelink signaling that includes resource selection assistance and/or paging information to the assisted UE, which may be a pedestrian UE (P-UE) that has a limited power budget, periodically transitions between active and low-power modes to reduce power consumption, and/or the like. Additionally, or alternatively, the assisting UE and/or the assisted UE may be other suitable UEs that communicate on a sidelink (e.g., in a V2X environment or another suitable environment that utilizes sidelink communications). Accordingly, while some aspects may be described herein with reference to vehicle-to-pedestrian (V2P) and/or pedestrian-to-vehicle (P2V) communications, aspects described herein may also be applicable to other suitable sidelink communications.

As shown in <FIG>, and by reference number <NUM>, the assisting UE may perform sidelink and environmental sensing operations. For example, in some aspects, the assisting UE may measure one or more sidelink channels (e.g., sidelink resource pools that include time and frequency resources allocated to transmissions from the assisting UE, the assisted UE, and/or the like) to obtain one or more measurements associated with the sidelink channels. For example, in some aspects, the assisting UE may measure energy levels on the sidelink channels to determine a CBR that indicates a proportion of time (e.g., within a sensing window) during which the measured energy levels on the sidelink channels are above a threshold. Additionally, or alternatively, the assisting UE may obtain other suitable measurements that may relate to channel congestion and/or other conditions associated with the one or more sidelink channels, such as a received signal strength indicator (RSSI) parameter (e.g., a sidelink-RSSI (S-RSSI) parameter), a reference signal received power (RSRP) parameter (e.g., a physical sidelink shared channel (PSSCH)-RSRP parameter), a reference signal received quality (RSRQ) parameter (e.g., a PSSCH-RSRQ parameter), and/or the like. Furthermore, in some aspects, the assisting UE may obtain a bit map indicating the availability of resources that the assisted UE can use to transmit. For example, if there are N subchannels that the assisted UE is allowed to use for transmission, the assisting UE can provide a bit map of length N to indicate whether each individual subchannel is available to use for transmission (e.g., where there are five subchannels that the assisted UE can use to transmit, a bitmap of [<NUM>] may indicate that the first two subchannels are unavailable for transmission based on '<NUM>' having a meaning that the corresponding resources are already occupied, while the last three subchannels are available for the assisted UE to transmit based on '<NUM>' having a meaning that the corresponding resources are available).

Furthermore, in some aspects, the assisting UE may perform environmental sensing operations. For example, the assisting UE may identify the presence, location, velocity, travel direction, and/or the like for one or more vehicles in a surrounding environment; the presence, location, velocity, travel direction, and/or the like for the assisted UE; and/or the like. Additionally, or alternatively, in some aspects, the assisting UE may determine information related to traffic infrastructure, such as the state(s) associated with one or more traffic signals, lane markings, road signs, and/or the like. In this way, the assisting UE may sense environmental conditions that may satisfy a condition to page or otherwise alert the assisted UE (e.g., when the assisted UE may be at risk of a collision based at least in part on the locations and/or movements (e.g., velocities, travel directions, and/or the like) for the assisted UE and/or other objects or devices in the surrounding environment).

As further shown in <FIG>, and by reference number <NUM>, the assisting UE may perform the sidelink resource and environmental sensing operations during one or more time periods that are outside a resource pool that includes time and frequency resources allocated to transmissions from the assisting UE to the assisted UE, from the assisted UE to the assisting UE, and/or the like. For example, in cases where the assisting UE and the assisted UEs respectively correspond to a V-UE and a P-UE communicating in a V2X environment, communications in the V2X environment may include various resource pools that are used for different communication protocols. For example, as shown, communications in the V2X environment may include one or more resource pools that are allocated to P2V and/or V2P communications, which may be time division multiplexed (TMDed) with non-P2V/V2P resource pools (e.g., resource pools for V2V communications, V2N communications, V2I communications, and/or the like). Accordingly, in cases where the assisting UE is a V-UE and the assisted UE is a P-UE, the assisting UE may perform the sidelink resource and environmental sensing operations, and the assisted UE may enter a low-power state during the non-P2V/V2P resource pools.

As further shown in <FIG>, and by reference number <NUM>, the assisting UE may transmit, and the assisted UE may receive, sidelink signaling that includes a sidelink wakeup signal and/or resource assistance information. For example, as described in further detail below, the P2V/V2P resource pool may include one or more physical resource blocks (PRBs) that precede a P2V resource pool that includes time and frequency resources allocated to transmissions from P-UEs to V-UEs and a V2P resource pool that includes time and frequency resources allocated to transmissions from V-UEs to P-UEs. Accordingly, in some aspects, the assisting UE may transmit the sidelink signaling that includes the resource assistance information and/or the sidelink wakeup signal in the one or more PRBs that precede the P2V resource pool and the V2P resource pool. Furthermore, as described in more detail below, the sidelink signaling may include the resource assistance information only, separate transmissions of the resource assistance information and the sidelink wakeup signal, a joint transmission of the resource assistance information and the sidelink wakeup signal, and/or the like.

As further shown in <FIG>, and by reference number <NUM>, the assisted UE may perform one or more transmit and/or receive operations based at least in part on the sidelink signaling. For example, when the assisted UE intends to transmit (e.g., to announce presence, location, velocity, travel direction, and/or the like), the assisted UE may select a resource to be used for the transmission based on the resource assistance information included in the sidelink signaling. Furthermore, in cases where the sidelink signaling includes a sidelink wakeup signal to indicate that there are one or more upcoming transmissions to be received by the assisted UE (e.g., a V2P transmission, such as a safety alert), the assisted UE may schedule reception of the one or more upcoming transmissions. In this way, the assisted UE may refrain from performing sensing operations prior to performing a sidelink transmission, which may conserve power resources associated with the assisted UE. Furthermore, by providing the assisted UE with a sidelink wakeup signal to indicate when there are one or more upcoming transmissions to be received by the assisted UE, the assisting UE may efficiently page the assisted UE when there are mission-critical or other important messages to be received by the assisted UE (e.g., when the assisted UE is on a collision course). Additionally, or alternatively, in cases where the assisting UE does not provide a sidelink wakeup signal, the assisted UE may stay in a low-power mode rather than transitioning into an active mode to monitor a sidelink channel and/or the like. Furthermore, in some aspects, the assisted UE may wake up to receive the resource assistance information (from the assisting UE) before the assisted UE attempts to transmit regardless of whether the assisting UE provides a sidelink wakeup signal.

As shown in <FIG>, and by reference number <NUM>, the P2V/V2P resource pool may include a P2V pool (TP2V) that includes time and frequency resources allocated to P2V transmissions, a V2P pool (TV2P) that includes time and frequency resources allocated to V2P transmissions, and, useful for understanding the invention, separate resource pools (e.g., slots, PRBs, and/or the like) for a sidelink wakeup signal and resource assistance information. As shown in <FIG>, the resource pools for the sidelink wakeup signal and the resource assistance information may generally precede the P2V pool and the V2P pool. Furthermore, when the assisting UE separately transmits both the resource assistance information and the sidelink wakeup signal, the resource assistance information may be transmitted in one or more slots, PRBs, and/or the like after the sidelink wakeup signal and prior to the P2V and V2P pools, and the slots, PRBs, and/or the like used to transmit the resource assistance information and/or the sidelink wakeup signal may be selected by the assisting UE randomly, based at least in part on the sensed sidelink channel conditions, and/or the like. In some aspects, time and frequency resources (e.g., in terms of slots and/or PRBs) may be preconfigured for the resource assistance information, and the preconfigured time and frequency resources for the resource assistance information may be defined according to a slot offset, a PRB offset, and/or the like with respect to time and frequency resources reserved, preconfigured, or otherwise allocated to the sidelink wakeup signal. Furthermore, although <FIG> illustrates the P2V pool as preceding the V2P pool, in some aspects, the V2P pool may precede the P2V pool.

In some aspects, when the resources allocated to the sidelink signaling include separate resources for the resource assistance information and the sidelink wakeup signal, the assisting UE may transmit the sidelink wakeup signal only when there are one or more V2P transmissions to be received by the assisted UE (e.g., the assisting UE may refrain from transmitting the sidelink wakeup signal to a P-UE that is traveling on the sidewalk a safe distance away from any vehicles). However, the assisting UE may always transmit the resource assistance information to enable the assisted UE to select a suitable resource to perform a P2V transmission. Accordingly, in some cases, the assisted UE may refrain from decoding the resource assistance information in cases where the assisted UE does not intend to initiate a P2V transmission. For example, if the assisted UE does not intend to initiate a P2V transmission, the assisted UE generally does not need to select a suitable transmission resource and may therefore refrain from decoding the resource assistance information in such cases. In some aspects, the assisted UE may refrain from decoding the resource assistance information in any P2V/V2P occasion in which the assisted UE does not intend to transmit, or the assisted UE may refrain from decoding the resource assistance information only when a sidelink wakeup signal is not detected. For example, in cases where a sidelink wakeup signal is detected to announce an upcoming safety alert, the assisted UE may decode the resource assistance information to select a resource to send a P2V transmission acknowledging the sidelink wakeup signal, to provide updated information related to the location and/or movement of the assisted UE, and/or the like.

As further shown in <FIG>, and by reference number <NUM>, the resource pool allocated to transmissions by the assisted UE (e.g., a P2V pool) may divided into one or more sub-pools, and the assisting UE may configure the resource assistance information associated with the P2V pool, the one or more sub-pools, and/or the like to provide the resource assistance information at different levels of granularity. For example, in some aspects, the resource assistance information may include a coarse CBR for the entire P2V pool, which may be represented as a value in a range from zero to one to indicate a proportion of time when measured energy in the P2V pool satisfies a threshold. Additionally, or alternatively, the resource assistance information may include a CBR associated with each individual sub-pool in the P2V pool, which may provide the assisted UE with more granular information to be used to select a resource for a P2V transmission. For example, if the CBR for the entire P2V pool has a value of <NUM>, the assisted UE may determine that the P2V pool is congested and defer transmissions, increase a transmit power, and/or the like. However, in an example where the P2V pool includes four sub-pools, with three sub-pools having a CBR of <NUM> and a fourth sub-pool having a CBR of <NUM> (equivalent to a coarse CBR of <NUM> for the entire P2V pool), the more granular CBR provided per sub-pool may enable the assisted UE to select the fourth sub-pool that is relatively uncongested. Furthermore, in some aspects, the assisting UE may provide a full resource map of the entire P2V pool (e.g., a CBR per resource block and/or the like), which may provide further granularity in the information that the assisting UE can use to select a P2V resource. For example, in some aspects, the full resource map may include a detailed bit map that the assisting UE provides to indicate the availability of resources that the assisted UE can use to transmit. For example, if a pool configuration for the assisted UE includes N subchannels that the assisted UE is allowed to use for transmission, the assisting UE can provide a bit map of length N to indicate whether each individual subchannel in the pool configuration for the assisted UE is available to use for transmission (e.g., where there are five subchannels that the assisted UE can use to transmit, a bitmap of [<NUM>] may indicate that the first two subchannels are unavailable for transmission based on '<NUM>' having a meaning that the corresponding resources are already occupied, while the last three subchannels are available for the assisted UE to transmit based on '<NUM>' having a meaning that the corresponding resources are available). In this way, the detailed bit map may provide further granularity in the information that the assisting UE can use to select a suitable P2V resource to be used for a transmission.

As shown in <FIG>, and by reference number <NUM>, another configuration for the P2V/V2P resource pool may include a P2V pool (TP2V) for P2V transmissions, a V2P pool (TV2P) for V2P transmissions, and a resource pool that includes time and frequency resources (e.g., slots, PRBs, and/or the like) in which, according to the invention, a sidelink wakeup signal and resource assistance information can be jointly transmitted. As shown in <FIG>, the resource pool for the joint transmission of the sidelink wakeup signal and the resource assistance information may precede the P2V pool and the V2P pool. Furthermore, although <FIG> illustrates the P2V pool as preceding the V2P pool, in some aspects, the V2P pool may precede the P2V pool.

In order to jointly transmit the sidelink wakeup signal and the resource assistance information, there may be N preconfigured sequences {s<NUM>; s<NUM>,. sN} that can be used to indicate a particular combination of sidelink parameters (e.g., sidelink wakeup signal and resource assistance information). In general, each of the N preconfigured sequences may be a unique sequence, such as a Zadoff-Chu sequence, to jointly indicate the presence of the sidelink wakeup signal and one or more parameters for the resource assistance information. For example, the assisting UE may transmit a first preconfigured sequence, s<NUM>, to jointly indicate the presence of the sidelink wakeup signal and indicate that the CBR for the entire P2V pool is in a range from [a, b], where a, b ∈ [<NUM>, <NUM>] with a ≤ b. In another example, the assisting UE may transmit a second preconfigured sequence, s<NUM>, to jointly indicate the presence of the sidelink wakeup signal and indicate that a first sub-pool has a CBR in a range from [a<NUM>, b<NUM>] and a second sub-pool has a CBR in a range from [a<NUM>, b<NUM>], where ai, bi(i = <NUM>, <NUM>) ∈ [<NUM>,<NUM>] with ai ≤ bi. In still another example, the assisting UE may transmit a third sequence, s<NUM>, to jointly indicate the presence of the sidelink wakeup signal and indicate that a particular sub-pool has a CBR in a range from [a<NUM>, b<NUM>] and the entire P2V pool has a CBR in a range from [a<NUM>, b<NUM>], where ai, bi(i = <NUM>, <NUM>) ∈ [<NUM>,<NUM>] with ai ≤ bi. Accordingly, in some aspects, the assisting UE may select a sequence to be transmitted based at least in part on the sensed channel conditions (e.g., the CBR associated with the entire P2V pool, one or more sub-pools, and/or the like) in cases where the assisting UE intends to jointly indicate the sidelink wakeup signal and the resource assistance information.

Furthermore, in some aspects, the sequences {s<NUM>, s<NUM>,. sN} may be orthogonal to one another, whereby different assisting UEs may transmit different sequences to reflect the sidelink channel conditions sensed by each respective assisting UE. For example, as described above, channel conditions may vary in a sidelink communication system, such as a V2X environment, due to the presence (or absence) of devices at different locations in the environment, among other factors. Accordingly, different assisting UEs may sense different sidelink channel conditions, and configuring the sequences {s<NUM>, s<NUM>,. sN} to be orthogonal to one another may enable different assisting UEs to transmit different sequences to indicate the different sidelink channel conditions without the transmissions of the sequences colliding with one another. For example, in a particular joint sidelink wakeup signal and resource assistance information occasion, a first assisting UE may transmit a first sequence, s<NUM>, and a second assisting UE may transmit a second sequence, s<NUM>. Accordingly, an assisted UE may receive and decode one or more sequences (e.g., sequence s<NUM> from the first assisting UE and sequence s<NUM> from the second assisting UE) and determine a weighted CBR metric that provides a better estimate of the CBR for resource selection.

As further shown in <FIG>, and by reference number <NUM>, the resource pool allocated to the joint transmission of the sidelink wakeup signal and the resource assistance information may include various PRBs, sub-channels, and/or the like in which the sequence(s) jointly indicating the sidelink wakeup signal and the resource assistance information can be transmitted. Accordingly, in some aspects, the assisting UE may randomly select a particular resource to transmit a sequence jointly indicating the sidelink wakeup signal and the resource assistance information, or the assisting UE may select the resource to transmit the sequence based at least in part on the sensed sidelink channel conditions. Additionally, or alternatively, in some aspects, the one or more PRBs, sub-channels, and/or the like in which the sequence can be transmitted may be frequency division multiplexed (FDMed), whereby a resource that is used to transmit a sequence may implicitly indicate the meaning of the sequence. For example, if the assisting UE transmits a particular sequence (e.g., sequence s<NUM>) using a first PRB (e.g., resource L<NUM>), the transmission of the sequence within the first PRB may jointly indicate a sidelink wakeup signal and a sensed CBR in a range from [a<NUM>, b<NUM>], where a<NUM>, b<NUM> ∈ [<NUM>,<NUM>] with a<NUM> ≤ b<NUM>. However, if the assisting UE transmits the same sequence using a second PRB (e.g., resource L<NUM>), the transmission of the sequence within the second PRB may jointly indicate a sidelink wakeup signal and a sensed CBR in a range from [a<NUM>, b<NUM>], where a<NUM>, b<NUM> ∈ [<NUM>,<NUM>] with a<NUM> ≤ b<NUM> and with a<NUM> ≠ a<NUM> and/or b<NUM> ≠ b<NUM>.

<FIG> is a diagram illustrating an example process <NUM> performed, for example, by a UE, in accordance with various aspects of the present disclosure. Example process <NUM> is an example where a UE (e.g., UE <NUM>, UE <NUM>-<NUM> and/or <NUM>-<NUM>, Tx/Rx UE <NUM>, Rx/Tx UE <NUM>, assisting UE in <FIG>, and/or the like) performs operations associated with sidelink resource selection assistance and paging.

As shown in <FIG>, in some aspects, process <NUM> may include obtaining one or more measurements associated with a sidelink resource pool that includes one or more time and frequency resources allocated to sidelink transmissions to or from the UE (block <NUM>). For example, the UE may obtain (e.g., using antenna <NUM>, DEMOD <NUM>, MIMO detector <NUM>, receive processor <NUM>, controller/processor <NUM>, memory <NUM>, and/or the like) one or more measurements associated with a sidelink resource pool that includes one or more time and frequency resources allocated to sidelink transmissions to or from the UE, as described above.

As further shown in <FIG>, in some aspects, process <NUM> may include transmitting sidelink signaling to an assisted UE, wherein the sidelink signaling includes signaling to wake up the assisted UE and resource assistance information indicating the one or more measurements associated with the sidelink resource pool (block <NUM>). For example, the UE may transmit (e.g., using controller/processor <NUM>, transmit processor <NUM>, TX MIMO processor <NUM>, MOD <NUM>, antenna <NUM>, and/or the like) sidelink signaling to an assisted UE, as described above. In some aspects, the sidelink signaling includes signaling to wake up the assisted UE and resource assistance information indicating the one or more measurements associated with the sidelink resource pool.

Process <NUM> includes additional aspects, such as any single aspect or any combination of aspects described below and/or in connection with one or more other processes described elsewhere herein.

In an aspect according to the invention, the sidelink signaling includes a sequence to jointly indicate a sidelink wakeup signal and the resource assistance information.

In another aspect, alone or in combination with one or more of the preceding aspects, the sequence indicates a range for a coarse CBR associated with the sidelink resource pool.

In a further aspect, alone or in combination with one or more of the preceding aspects, the sidelink resource pool includes one or more sub-pools, and the sequence indicates one or more of a range for a coarse CBR associated with the sidelink resource pool or a range for a CBR associated with at least one of the one or more sub-pools.

In yet another aspect, alone or in combination with one or more of the preceding aspects, the sequence indicates one or more of the range for the coarse CBR associated with the sidelink resource pool or the range for the CBR associated with the at least one of the one or more sub-pools based at least in part on a PRB in which the sequence is transmitted.

In an even further aspect, alone or in combination with one or more of the preceding aspects, the sequence is one of a plurality of preconfigured sequences that are orthogonal with respect to one another.

<FIG> is a diagram illustrating an example process <NUM> performed, for example, by a UE, in accordance with various aspects of the present disclosure. Example process <NUM> is an example where a UE (e.g., UE <NUM>, UE <NUM>-<NUM> and/or <NUM>-<NUM>, Tx/Rx UE <NUM>, Rx/Tx UE <NUM>, assisted UE in <FIG>, and/or the like) performs operations associated with sidelink resource selection assistance and paging.

As shown in <FIG>, in some aspects, process <NUM> may include receiving, from an assisting UE, sidelink signaling that includes signaling to wake up the UE and resource assistance information indicating one or more measurements associated with a sidelink resource pool that includes one or more time and frequency resources allocated to sidelink transmissions to or from the UE (block <NUM>). For example, the UE may receive (e.g., using antenna <NUM>, DEMOD <NUM>, MIMO detector <NUM>, receive processor <NUM>, controller/processor <NUM>, memory <NUM>, and/or the like), from an assisting UE, sidelink signaling that includes signaling to wake up the UE and resource assistance information indicating one or more measurements associated with a sidelink resource pool that includes one or more time and frequency resources allocated to sidelink transmissions to or from the UE, as described above.

As further shown in <FIG>, in some aspects, process <NUM> may include performing one or more transmit or receive operations based at least in part on the sidelink signaling (block <NUM>). For example, the UE may perform (e.g., using antenna <NUM>, DEMOD <NUM>, MIMO detector <NUM>, receive processor <NUM>, controller/processor <NUM>, memory <NUM>, transmit processor <NUM>, TX MIMO processor <NUM>, MOD <NUM>, and/or the like) one or more transmit or receive operations based at least in part on the sidelink signaling, as described above.

Claim 1:
A method of wireless communication performed by a user equipment, UE, comprising:
obtaining (<NUM>) one or more measurements to determine a channel busy ratio, CBR, associated with a sidelink resource pool that includes one or more time and frequency resources allocated to sidelink transmissions to or from the UE; and
transmitting (<NUM>) sidelink signaling to an assisted UE,
wherein the sidelink signaling includes a sequence to jointly indicate a sidelink wakeup signal to wake up the assisted UE and resource assistance information indicating the one or more measurements associated with the sidelink resource pool.