Patent Description:
NR is a set of enhancements to the long term evolution (LTE) mobile standard promulgated by 3GPP.

These improvements should be applicable to other multi-access technologies and the telecommunication standards that employ these technologies.

European patent application <CIT> discloses sensing of efficient resources in inter-device communication such as V2X communication. Instead of full sensing, burst sensing and distributed sensing are suggested wherein a sensing period can be varied.

Document <CIT> discloses another example of the prior art.

Without limiting the scope of this disclosure as expressed by the claims that follow, some features will now be discussed briefly. After considering this discussion, and particularly after reading the section entitled "Detailed Description" one will understand how the features of this disclosure provide advantages that include low power channel sensing.

The present disclosure provides an apparatus for wireless communications according to claim <NUM> and a method for wireless communications according to claim <NUM>. Specific embodiments are subject of the dependent claims.

It is to be noted, however, that the appended drawings illustrate only certain aspects of this disclosure, and the description may admit to other equally effective aspects.

Aspects of the present disclosure provide apparatus, methods, processing systems, and computer readable mediums for low power channel sensing, for example, for pedestrian user equipments (P-UEs).

The following description provides examples of low power channel sensing, and is not limiting of the scope, applicability, or examples set forth in the claims. In addition, the scope of the disclosure is intended to cover such an apparatus or method that is practiced using other structure, functionality, or structure and functionality in addition to, or other than, the various aspects of the disclosure set forth herein.

The techniques described herein may be used for various wireless networks and radio technologies me. For clarity, while aspects may be described herein using terminology commonly associated with <NUM>, <NUM>, and/or new radio (e.g., <NUM> NR) wireless technologies, aspects of the present disclosure can be applied in other generation-based communication systems including later technologies.

NR access may support various wireless communication services, such as enhanced mobile broadband (eMBB) targeting wide bandwidth, millimeter wave (mmW) targeting high carrier frequency, massive machine type communications MTC (mMTC) targeting non-backward compatible MTC techniques, and/or mission critical targeting ultra-reliable low-latency communications (URLLC).

The electromagnetic spectrum is often subdivided, based on frequency/wavelength, into various classes, bands, channels, etc. In <NUM> NR two initial operating bands have been identified as frequency range designations FR1 (<NUM> - <NUM>) and FR2 (<NUM> - <NUM>). Although a portion of FR1 is greater than <NUM>, FR1 is often referred to (interchangeably) as a "Sub-<NUM>" band in various documents and articles.

NR may also support beamforming and beam direction may be dynamically configured. Multiple-input multiple-output (MIMO) transmissions with precoding may also be supported. In some examples, MIMO configurations in the downlink (DL) may support up to <NUM> transmit antennas with multi-layer DL transmissions up to <NUM> streams and up to <NUM> streams per UE.

The core network <NUM> may in communication with one or more base station (BSs) 110a-z (each also individually referred to herein as BS <NUM> or collectively as BSs <NUM>) and/or user equipment (UE) 120a-y (each also individually referred to herein as UE <NUM> or collectively as UEs <NUM>) in the wireless communication network <NUM> via one or more interfaces.

A BS <NUM> may provide communication coverage for a particular geographic area, sometimes referred to as a "cell", which may be stationary or may move according to the location of a mobile BS.

According to certain aspects, the UEs <NUM> may be configured for sidelink communications. As shown in <FIG>, the UE 120a includes a channel sensing manager 122a, the UE 120b includes a channel sensing manager 122b, and the BS 110a includes a channel sensing manager 112a. The channel sensing manager 122a, the channel sensing manager 122b, and/or the channel sensing manager 112a may be configured for low power channel sensing, in accordance with aspects of the present disclosure.

<FIG> illustrates example components of BS 110a and UE 120a (e.g., in the wireless communication network <NUM> of <FIG>, which may be similar components in the UE 120b), which may be used to implement aspects of the present disclosure.

At the BS 110a, a transmit processor <NUM> may receive data from a data source <NUM> and control information from a controller/processor <NUM>. The control information may be for the physical broadcast channel (PBCH), physical control format indicator channel (PCFICH), physical hybrid ARQ indicator channel (PHICH), physical downlink control channel (PDCCH), group common PDCCH (GC PDCCH), etc. The data may be for the physical downlink shared channel (PDSCH), etc. A medium access control (MAC)-control element (MAC-CE) is a MAC layer communication structure that may be used for control command exchange between wireless nodes. For example, a BS may transmit a MAC CE to a UE to put the UE into a discontinuous reception (DRX) mode to reduce the UE's power consumption. The MAC-CE may be carried in a shared channel such as a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), or a physical sidelink shared channel. A MAC-CE may also be used to communicate information that facilitates communication, such as information regarding buffer status and available power headroom.

The processor <NUM> may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively. The transmit processor <NUM> may also generate reference symbols, such as for the primary synchronization signal (PSS), secondary synchronization signal (SSS), and channel state information reference signal (CSI-RS). A transmit (TX) multiple-input multiple-output (MIMO) processor <NUM> may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, and/or the reference symbols, if applicable, and may provide output symbol streams to the modulators (MODs) in transceivers 232a-232t. Each modulator may process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a DL signal. DL signals from modulators in transceivers 232a-232t may be transmitted via the antennas 234a-234t, respectively.

At the UE 120a, the antennas 252a-252r may receive the DL signals from the BS 110a, or sidelink signals from the UE 120b, and may provide received signals to the demodulators (DEMODs) in transceivers 254a-254r, respectively. Each demodulator may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples. A MIMO detector <NUM> may obtain received symbols from all the demodulators in transceivers 254a-254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols. A receive processor <NUM> may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 120a to a data sink <NUM>, and provide decoded control information to a controller/processor <NUM>.

On the uplink (UL), at UE 120a, a transmit processor <NUM> may receive and process data (e.g., for the physical uplink shared channel (PUSCH)) from a data source <NUM> and control information (e.g., for the physical uplink control channel (PUCCH) from the controller/processor <NUM>. The symbols from the transmit processor <NUM> may be precoded by a TX MIMO processor <NUM> if applicable, further processed by the demodulators in transceivers 254a-254r (e.g., for SC-FDM, etc.), and transmitted to the BS 110a. At the BS 110a, the UL signals from the UE 120a may be received by the antennas <NUM>, processed by the modulators, detected by a MIMO detector <NUM> if applicable, and further processed by a receive processor <NUM> to obtain decoded data and control information sent by the UE 120a.

The memory <NUM> and memory <NUM> may store data and program codes for BS 110a and UE 120a, respectively. A scheduler <NUM> may schedule UEs for data transmission on the DL and/or UL.

Antennas <NUM>, processors <NUM>, <NUM>, <NUM>, and/or controller/processor <NUM> of the UE 120a and/or antennas <NUM>, processors <NUM>, <NUM>, <NUM> may be used to perform the various techniques and methods described herein. For example, as shown in <FIG>, the controller/processor <NUM> of the UE 120a has a channel sensing manager <NUM> and the controller/processor <NUM> of the BS 110a has a channel sensing manager <NUM>. The channel sensing manager <NUM> and/or the channel sensing manager <NUM> may be configured for low power channel sensing, in accordance with aspects of the disclosure.

NR may utilize orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) on the UL and DL.

The transmission timeline for each of the DL and UL may be partitioned into units of radio frames. Each subframe may include a variable number of slots (e.g., <NUM>, <NUM>, <NUM>, <NUM>, <NUM>,. slots) depending on the SCS. Each slot may include a variable number of symbol periods (e.g., <NUM> or <NUM> symbols) depending on the SCS.

In NR, a synchronization signal block (SSB) is transmitted. In certain aspects, SSBs may be transmitted in a burst where each SSB in the burst corresponds to a different beam direction for UE-side beam management (e.g., including beam selection and/or beam refinement). The SSB includes a PSS, a SSS, and a two symbol PBCH. The SSB can be transmitted in a fixed slot location, such as the symbols <NUM>-<NUM> as shown in <FIG>. The PBCH carries some basic system information, such as DL system bandwidth, timing information within radio frame, SS burst set periodicity, system frame number, etc. The SSBs may be organized into SS bursts to support beam sweeping. The SSB can be transmitted up to sixty-four times, for example, with up to sixty-four different beam directions for mmWave. The multiple transmissions of the SSB are referred to as a SS burst set. SSBs in an SS burst set may be transmitted in the same frequency region, while SSBs in different SS bursts sets can be transmitted at different frequency regions.

A scheduling entity (e.g., a BS <NUM>) allocates resources for communication among some or all devices and equipment within its service area or cell. BSs <NUM> are not the only entities that may function as a scheduling entity. In some examples, a UE <NUM> may function as a scheduling entity and may schedule resources for one or more subordinate entities (e.g., one or more other UEs <NUM>), and the other UEs <NUM> may utilize the resources scheduled by the UE <NUM> for wireless communication. In some examples, a UE <NUM> may function as a scheduling entity in a peer-to-peer (P2P) network, and/or in a mesh network. In a mesh network example, UEs <NUM> may communicate directly with one another in addition to communicating with a scheduling entity.

In some examples, the communication between the UEs <NUM> and BSs <NUM> is referred to as the access link. The access link may be provided via a Uu interface. Communication between devices may be referred as the sidelink.

In some examples, two or more subordinate entities (e.g., UEs <NUM>) may communicate with each other using sidelink signals. Generally, a sidelink signal may refer to a signal communicated from one subordinate entity (e.g., UE 120a) to another subordinate entity (e.g., another UE <NUM>) without relaying that communication through the scheduling entity (e.g., UE <NUM> or BS <NUM>), even though the scheduling entity may be utilized for scheduling and/or control purposes. In some examples, the sidelink signals may be communicated using a licensed spectrum (unlike wireless local area networks, which may use an unlicensed spectrum). One example of sidelink communication is PC5, for example, as used in V2V, LTE, and/or NR.

Various sidelink channels may be used for sidelink communications, including a physical sidelink discovery channel (PSDCH), a physical sidelink control channel (PSCCH), a physical sidelink shared channel (PSSCH), and a physical sidelink feedback channel (PSFCH). The PSDCH may carry discovery expressions that enable proximal devices to discover each other. The PSCCH may carry control signaling such as sidelink resource configurations and other parameters used for data transmissions, and the PSSCH may carry the data transmissions. The PSFCH may carry feedback such as CSI related to a sidelink channel quality.

Roadside units (RSUs) may be utilized. An RSU may be used for V2I communications. In some examples, an RSU may act as a forwarding node to extend coverage for a UE. In some examples, an RSU may be co-located with a BS or may be standalone. RSUs can have different classifications. For example, RSUs can be classified into UE-type RSUs and Micro NodeB-type RSUs. Micro NB-type RSUs have similar functionality as the Macro eNB/gNB. The Micro NB-type RSUs can utilize the Uu interface. UE-type RSUs can be used for meeting tight quality-of-service (QoS) requirements by minimizing collisions and improving reliability. UE-type RSUs may use centralized resource allocation mechanisms to allow for efficient resource utilization. Information (e.g., such as traffic conditions, weather conditions, congestion statistics, sensor data, etc.) can be broadcast to UEs in the coverage area. Relays can re-broadcast information received from some UEs. UE-type RSUs may be a reliable synchronization source.

<FIG> and <FIG> show diagrammatic representations of example V2X systems, in accordance with some aspects of the present disclosure. For example, the vehicles shown in <FIG> and <FIG> may communicate via sidelink channels and may perform sidelink CSI reporting as described herein.

The V2X systems, provided in <FIG> and <FIG> provide two complementary transmission modes. A first transmission mode, shown by way of example in <FIG>, involves direct communications (for example, also referred to as side link communications) between participants in proximity to one another in a local area. A second transmission mode, shown by way of example in <FIG>, involves network communications through a network, which may be implemented over a Uu interface (for example, a wireless communication interface between a radio access network (RAN) and a UE).

Referring to <FIG>, a V2X system <NUM> (for example, including vehicle to vehicle (V2V) communications) is illustrated with two vehicles <NUM>, <NUM>. The first transmission mode allows for direct communication between different participants in a given geographic location. As illustrated, a vehicle can have a wireless communication link <NUM> with an individual (V2P) (for example, via a UE) through a PC5 interface. Communications between the vehicles <NUM> and <NUM> may also occur through a PC5 interface <NUM>. In a like manner, communication may occur from a vehicle <NUM> to other highway components (for example, highway component <NUM>), such as a traffic signal or sign (V2I) through a PC5 interface <NUM>. With respect to each communication link illustrated in <FIG>, two-way communication may take place between elements, therefore each element may be a transmitter and a receiver of information. The V2X system <NUM> may be a self-managed system implemented without assistance from a network entity. A self-managed system may enable improved spectral efficiency, reduced cost, and increased reliability as network service interruptions do not occur during handover operations for moving vehicles. The V2X system may be configured to operate in a licensed or unlicensed spectrum, thus any vehicle with an equipped system may access a common frequency and share information. Such harmonized/common spectrum operations allow for safe and reliable operation.

<FIG> shows a V2X system <NUM> for communication between a vehicle <NUM> and a vehicle <NUM> through a network entity <NUM>. These network communications may occur through discrete nodes, such as a BS, that sends and receives information to and from (for example, relays information between) vehicles <NUM>, <NUM>. The network communications through vehicle to network (V2N) links <NUM> and <NUM> may be used, for example, for long range communications between vehicles, such as for communicating the presence of a car accident a distance ahead along a road or highway. Other types of communications may be sent by the wireless node to vehicles, such as traffic flow conditions, road hazard warnings, environmental/weather reports, and service station availability, among other examples. Such data can be obtained from cloud-based sharing services.

Channel sensing may be used by UEs in order to allow multiple UEs to coexist, for example, in a V2X network. Channel sensing may allow UEs to avoid collisions with other UEs' transmissions. For example, channel sensing may allow a sensing UE to know the resource usage in the channel, so that the sensing UE can avoid transmitting on resources that are currently being used by other UEs.

Channel sensing involves overhead. For example, it takes time (e.g., <NUM>) for UEs to perform the channel sensing to obtain the channel resource usage. In certain systems, such as for vehicle UEs (V-UEs), channel sensing may be performed before every new transmission. Some UEs, such as P-UEs for example, may have a limited power budget (e.g., as compared to V-UEs). Thus, lower power channel sensing may be desirable to preserve power, while also avoiding collisions (e.g., or reducing the probability of collisions) with other UEs' transmissions.

The effective transmission power efficiency for channel sensing by a user equipment (UE) may be defined as the ratio of actual power spent on transmission to the sum of total power spent on transmission and sensing. Thus, the effective transmission power efficiency decreases with increased sensing.

In some examples, resources used for pedestrian-to-vehicle (P2V) and/or vehicle-to-pedestrian (V2P) communications may be in resource pools. <FIG> is a diagram illustrating example resource pools, in accordance with certain aspects of the present disclosure. As shown in <FIG>, P2V/V2P resources may be time division multiplexed (TDMed) with non-P2V/V2P resources. In some examples, the resources for channel sensing (e.g., P2V sensing occasions) and the resources for transmissions (e.g., P2V transmit (TX)/receive (RX) occasions) may be defined in terms of slots and/or subframes.

According to the invention, the UE (e.g., a pedestrian UE (P-UE)) adaptively determines the channel sensing duration and/or transmission duration. The UE adaptively determines the channel sensing and transmission durations based on a level of channel congestion for a channel. In some examples, during periods of light channel loading (e.g., lower levels of channel congestion), the UE may maximize the transmission time. During periods of high channel loading (e.g., higher levels of channel congestion), the UE may minimize collisions by increasing the channel sensing time to obtain better resource map usage, while maintaining the desired ratio of transmission time to sensing time. In some examples, based on the level of channel congestion for the channel, the UE may use full channel sensing for transmission at times and may use random transmission (e.g., with no channel sensing) at other times.

According to certain aspects, the channel congestion may be measured as a channel busy ratio (CBR), a percentage of resources deemed free by control decoding, and/or a signal quality measurement, such as reference signal received power (RSRP), received signal strength indicator (RSSI), or other measurement.

In some examples, the UE (e.g., the P-UE) performs the measurement of channel congestion. In some examples, another device (e.g., a V-UE) performs the channel congestion measurement and sends an indication to the UE of the level of channel congestion.

In some examples, the UE may compare the channel congestion level to a threshold. Accordingly, the channel sensing may be adapted based on whether or not the channel congestion exceeds a threshold. That is, an initial channel sensing (or coarse channel sensing) may be performed to obtain an initial channel congestion estimate (shown as the first P2V sensing occasion <NUM> in <FIG>). Based on this initial channel congestion estimate, adaptation of further sensing periods may be determined. In some examples, the UE may adjust the channel sensing based on a configured association of the channel congestion to channel sensing/transmission times/ratio (e.g., based on a configured table, mapping, etc.).

According to certain aspects, the UE may be configured to wake up periodically (e.g., every N slots). When the UE wakes up, the UE may perform channel sensing (e.g., for the P2V pool) during a number of slots n<NUM> (e.g., logically consecutive sensing slots in the P2V resource pool) to determine the resource availability. The UE may then communicate (e.g., continuously transmit/receive), during n<NUM> available slots (e.g., logically consecutive TX/RX slots in the P2V resource pool). According to aspects of the disclosure, the UE may adaptively determine the n<NUM> and n<NUM> parameters based on the level of channel congestion. For example, in the slot when the UE wakes, the UE may determine (e.g., measure or receive) the level of channel congestion and determine the n<NUM> and n<NUM> parameters (sensing and transmitting/receiving parameters, respectively).

In an illustrative example, a P-UE may begin with a sensing parameter n<NUM> = <NUM>. The P-UE may measure the channel in the first slot. If the CBR < x (e.g., x = <NUM>), then the P-UE ceases to sense for more slots (e.g., the congestion is low, so the UE maximizes transmission time). That is, the P-UE infers the resource map from the n<NUM> = <NUM> sensing duration and performs transmission thereafter for a configured n<NUM> slots. On the other hand, if x < CBR < y (e.g., x = <NUM>, y = <NUM>), the P-UE may perform sensing of an additional slot to obtain the resource map before transmitting. That is, in this case, n<NUM> = <NUM> slots (for sensing). And if CBR > z (e.g., z = <NUM>), the P-UE may sense for n<NUM> = <NUM> slots (e.g., because the channel is very congested).

After the sensing phase, the P-UE chooses the n<NUM> parameter and transmits in the n<NUM> slots (e.g., continuously). In some examples, the n<NUM> parameter may be chosen based on a target transmit power efficiency ratio and the n<NUM> parameter. For the example, the desired transmit power efficiency ratio (η) may be defined to be <MAT>. In some examples, the transmit power efficiency parameter η may be a decreasing function of channel congestion (e.g., CBR). That is, more continuous transmissions can be performed (e.g., higher n<NUM> parameter used) if channel congestion is less.

For example, as shown in <FIG>, a UE (e.g., P-UE) may be configured to wake-up every four slots for P2V (e.g., N = <NUM> resource pool). The UE may begin with a sensing parameter n<NUM> = <NUM> and the parameter n<NUM> = <NUM>. Thus, the UE may be configured to perform sensing (e.g., measure the channel) in the first two logically consecutive slots in the P2V resource pool, P2V sensing occasion <NUM> and P2V sensing occasion <NUM>, then transmit and/or receive on the channel in the next three logically consecutive slots, P2V TX/RX occasion <NUM>, P2V TX/RX occasion <NUM>, and P2V TX/RX occasion <NUM>, then perform sensing in the next two logically consecutive slots, P2V sensing occasion <NUM> and P2V sensing occasion <NUM>, and so on.

According to aspects of the disclosure, the UE may compare a measured level of channel congestion for the channel to a threshold level of channel congestion and adjust the n<NUM> and/or n<NUM> parameters (e.g., adjust the sensing duration and/or the transmission/reception duration). For example, the UE may adjust the n<NUM> parameter (i.e., the sensing duration) to <NUM> and the n<NUM> parameter (i.e., the transmit/receive duration) to <NUM>, as shown in <FIG>.

For example, when the congestion is low (e.g., below a threshold level of congestion), the UE may maximize transmission time. Accordingly, the UE may sense in the P2V sensing occasion <NUM> and transmit and/or receive in next logically consecutive slots in the P2V resource pool, P2V TX/RX occasion <NUM>, P2V TX/RX occasion <NUM>, P2V TX/RX occasion <NUM>, P2V TX/RX occasion <NUM>, P2V TX/RX occasion <NUM>. The UE may perform sensing again at P2V sensing occasion <NUM>, and so on.

According to some aspects, the sensing duration (n<NUM>) may be equal to zero. In this case, another device (e.g., a V-UE) may perform the channel congestion measurement and send an indication to the UE; therefore, the UE may not be performing the channel measurement. Based on the indicated channel measurement, the UE may determine the sensing and transmission duration (e.g., the n<NUM> and n<NUM> parameters) to adapt the sensing/transmission scheme accordingly.

According to certain aspects, the UE may vary or randomly select frequency resources in the n<NUM> transmission slots to further avoid collisions. For example, the UE may randomly choose physical resource blocks (PRBs) for each of its transmissions in the n<NUM> slots from the resource availability map obtained from the sensing phase.

According to certain aspects, the UE may also adapt its transmission power for the n<NUM> transmissions (e.g., Pt = αPmax), where Pt is the transmission power of the UE and Pmax is the maximum transmit power, and <NUM> ≤ α ≤ <NUM>. The UE may adjust the transmit power (e.g., select/apply the α parameter) when the UE has not received paging (e.g., from any V-UE) in a time window of T seconds/slots.

<FIG> is a flow diagram illustrating example operations <NUM> for wireless communications, in accordance with the claimed embodiments. The operations <NUM> are performed, for example, by a UE (e.g., such as a UE 120a or 120b in the wireless communication network <NUM>, which is a P-UE). In some examples, the UE is a P-UE in a V2P safety system.

Operations <NUM> may be implemented as software components that are executed and run on one or more processors (e.g., controller/processor <NUM> of <FIG>). Further, the transmission and reception of signals by the UE in operations <NUM> may be enabled, for example, by one or more antennas (e.g., antennas <NUM> of <FIG>). In certain aspects, the transmission and/or reception of signals by the UE may be implemented via a bus interface of one or more processors (e.g., controller/processor <NUM>) obtaining and/or outputting signals.

Operations <NUM> begin, at block <NUM>, by a UE determining a level of channel congestion for a channel during a first sensing duration. For example, the UE may determine CBR, a percentage of free resources based on control information, a channel quality measurement, and/or a signal strength measurement. Determining the level of channel congestion for the channel may involve performing channel congestion measurements. Determining the level of channel congestion for the channel may include receiving an indication of the level of channel congestion from a sidelink UE, a BS, and/or a V-UE.

At block <NUM>, the UE determines a second sensing duration and a transmission duration based on the level of channel congestion for the channel (e.g., determined from the first sensing duration at block <NUM>). In some examples, the UE may adaptively determine a ratio of sensing time to transmission time based on the level of channel congestion for the channel. The UE may determine a longer sensing duration when the determined level of channel congestion for the channel is higher, and the UE may determine a shorter sensing duration when the determined level of channel congestion for the channel is lower. In some examples, the UE may compare the level of channel congestion for the channel to a threshold, and the UE may adjust the second sensing duration based on whether the level of channel congestion for the channel exceeds the threshold. In some examples, the UE may select the second sensing duration based on a configured mapping of levels of channel congestion for the channel to sensing durations.

The UE determines resources from a P2V resource pool to use for sensing the channel. The P2V resource pool is time division multiplexed (TDMed) with non-P2V pool resources. In some examples, the UE randomly selects different frequency resources to use for transmission in different time resources.

At block <NUM>, the UE senses the channel for the second sensing duration.

In some examples, optionally, at block <NUM>, the UE determines to transmit or refrain from transmission on the channel based on sensing the channel for the second sensing duration. For example, the UE senses (and/or receives) in the n<NUM> logically consecutive slots in the P2V resource pool. Based on the sensing, the UE may determine to continue sensing (e.g., adapt the sensing time) or stop sensing and begin transmitting (e.g., in the next available P2V TX/RX occasion).

In some examples, optionally, at block <NUM>, the UE randomly selects, different resources to use for transmission in different time resources.

At block <NUM>, the UE transmits on the channel for the transmission duration. The UE transmits (and/or receives) in the n<NUM> logically consecutive slots in the P2V resource pool. In some examples, the UE adaptively determines a transmission power to use for transmitting based on a duration since paging was received.

According to the invention as claimed in the appended claims, the UE determines a first number of consecutive slots for sensing the channel and a second number of consecutive slots for transmitting to a V-UE. The first and second number of slots are adaptively determined based on the level of channel congestion for the channel. The first and second number of slots may be determined further based on a target ratio of sensing time to transmission time. In some examples, the UE adaptively determines the target ratio based on the level of channel congestion for the channel.

The communications device <NUM> includes a processing system <NUM> coupled to a transceiver <NUM> (e.g., a transmitter and/or a receiver).

The processing system <NUM> includes a processor <NUM> coupled to a computer-readable medium/memory <NUM> via a bus <NUM>. In certain aspects, the computer-readable medium/memory <NUM> is configured to store instructions (e.g., computer-executable code) that when executed by the processor <NUM>, cause the processor <NUM> to perform the operations illustrated in <FIG>, or other operations for performing the various techniques discussed herein for coordinated sidelink power savings configurations. In certain aspects, computer-readable medium/memory <NUM> stores code <NUM> for determining (e.g., for determining a level of channel congestion for a channel during a first sensing duration); code <NUM> for determining (e.g.. , for determining a second sensing duration and a transmission duration based on the level of channel congestion for the channel); code <NUM> for sensing (e.g., for sensing the channel for the second sensing duration); code <NUM> for determining (e.g., for determining to transmit or refrain from transmission on the channel based on sensing the channel for the second sensing duration); code <NUM> for randomly selecting (e.g., for randomly selecting different frequency resources to use for transmission in different time resources); and/or code <NUM> for transmitting (e.g., for transmitting on the channel for the transmission duration). In certain aspects, the processor <NUM> has circuitry configured to implement the code stored in the computer-readable medium/memory <NUM>. The processor <NUM> includes circuitry <NUM> for determining (e.g., for determining a level of channel congestion for a channel during a first sensing duration); circuitry <NUM> for determining (e.g., for determining a second sensing duration and a transmission duration based on the level of channel congestion determined from the first sensing duration); circuitry <NUM> for sensing (e.g., for sensing the channel for the second sensing duration); circuitry <NUM> for determining (e.g., for determining to transmit or refrain from transmission on the channel based on sensing the channel for the second sensing duration); circuitry <NUM> for randomly selecting (e.g., for randomly selecting different frequency resources to use for transmission in different time resources); and/or circuitry <NUM> for transmitting (e.g., for transmitting on the channel for the transmission duration).

Claim 1:
An apparatus for wireless communications by a pedestrian user equipment, P-UE (<NUM>; <NUM>), comprising:
a memory (<NUM>; <NUM>); and
at least one processor (<NUM>, <NUM>, <NUM>, <NUM>; <NUM>) coupled with the memory and configured to:
determine (<NUM>) a level of channel congestion for a channel during a first sensing duration;
determine (<NUM>), from a pedestrian-to-vehicle, P2V, resource pool, a second sensing duration to use for sensing the channel and a transmission duration, wherein the P2V resource pool is time division multiplexed with one or more non-P2V resource pools;
sense (<NUM>) the channel for the second sensing duration; and
transmit (<NUM>) on the channel for the transmission duration,
wherein:
to determine (<NUM>) the second sensing duration, the at least one processor is configured to determine a first number of consecutive slots in the P2V resource pool for sensing the channel; and
to determine (<NUM>) the transmission duration, the at least one processor is configured to determine a second number of consecutive slots in the P2V resource pool for transmitting to a vehicle UE, V-UE; and
wherein the first number of consecutive slots and the second number of consecutive slots are determined based on the determined level of channel congestion for the channel.