Low-power sensing for pedestrian user equipment (P-UE)

Abstract

Certain aspects of the present disclosure provide techniques for low-power channel sensing for pedestrian user equipment (P‑UE). A method that may be performed by a UE (e.g., such as a P‑UE) includes determining a channel congestion level of a channel during a first sensing duration. The method includes determining a second sensing duration and a transmission duration based on the channel congestion level of the channel determined from the first sensing duration. The method includes sensing the channel within the second sensing duration. The method includes transmitting on the channel within the transmission duration.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to U.S. Application No. 17 / 137,037, filed on December 29, 2020, which claims the benefit of and priority to U.S. Provisional Application No. 62 / 957,605, filed on January 6, 2020, both of which are assigned to the assignee of this application and are hereby expressly incorporated herein by reference as if fully set forth below and for all applicable purposes.

[0003] background

[0004] Public domain

[0005] Aspects of the present disclosure relate to wireless communications, and more particularly to techniques for low power channel sensing, for example, for pedestrian user equipment (P-UE).

[0006] Related technical description

[0007] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, broadcast, etc. These wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple-access systems include Third Generation Partnership Project (3GPP) Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, Single Carrier Frequency Division Multiple Access (SC-FDMA) systems, and Time Division Synchronous Code Division Multiple Access (TD-SCDMA) systems, to name just a few.

[0008] These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate at a city, country, region, and even global level. New radio (e.g., 5G NR) is an example of an emerging telecommunication standard. NR is an enhancement set of the Long Term Evolution (LTE) mobile standard promulgated by 3GPP. NR is designed to better support mobile broadband Internet access by using OFDMA with a cyclic prefix (CP) on the downlink (DL) and uplink (UL) to improve spectrum efficiency, reduce costs, improve services, utilize new spectrum, and better integrate with other open standards. To this end, NR supports beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.

[0009] However, as the demand for mobile broadband access continues to grow, there is a need for further improvements to NR and LTE technologies. These improvements should also apply to other multiple access technologies and the telecommunication standards that employ them.

[0010] Overview

[0011] The systems, methods, and devices of the present disclosure each have several aspects, no single aspect of which is solely responsible for its desirable attributes. Without limiting the scope of the present disclosure as expressed in the appended claims, some features will now be briefly discussed. After considering this discussion, and especially after reading the section entitled "Detailed Description," it will be understood how the features of the present disclosure provide advantages including low-power channel sensing.

[0012] One or more aspects of the subject matter described in the present disclosure may be implemented in an apparatus for wireless communication by a user equipment (UE). The apparatus generally includes a memory and at least one processor coupled to the memory. The at least one processor coupled to the memory is generally configured to determine a channel congestion level of a channel during a first sensing duration. The at least one processor coupled to the memory is generally configured to determine a second sensing duration and a transmission duration based on the channel congestion level of the channel determined from the first sensing duration. The at least one processor coupled to the memory is generally configured to sense the channel within the second sensing duration. The at least one processor coupled to the memory is generally configured to transmit on the channel within the transmission duration.

[0013] One or more aspects of the subject matter described in the present disclosure may be implemented in a method for wireless communication by a UE. The method generally includes determining a channel congestion level of a channel during a first sensing duration. The method generally includes determining a second sensing duration and a transmission duration based on the channel congestion level of the channel. The method generally includes sensing the channel within the second sensing duration. The method generally includes transmitting on the channel within the transmission duration.

[0014] One or more aspects of the subject matter described in the present disclosure may be implemented in a device for wireless communication. The device generally includes means for determining a channel congestion level of a channel during a first sensing duration. The device generally includes means for determining a second sensing duration and a transmission duration based on the channel congestion level of the channel. The device generally includes means for sensing the channel within the second sensing duration. The device generally includes means for transmitting on the channel within the transmission duration.

[0015] One or more aspects of the subject matter described in the present disclosure may be implemented in a computer-readable medium having computer executable code stored thereon. The computer-readable medium having computer executable code stored thereon generally includes: code for determining a channel congestion level of a channel during a first sensing duration. The computer-readable medium having computer executable code stored thereon generally includes: code for determining a second sensing duration and a transmission duration based on the channel congestion level of the channel. The computer-readable medium having computer executable code stored thereon generally includes: code for sensing the channel within a second sensing duration. The computer-readable medium having computer executable code stored thereon generally includes: code for transmitting on the channel within the transmission duration.

[0016] To achieve the foregoing and related ends, the one or more aspects include the features fully described below and particularly pointed out in the claims. The following description and the accompanying drawings set forth in detail certain illustrative features of the one or more aspects. However, these features are only indicative of several of the various ways in which the principles of the various aspects can be employed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to understand in detail the manner in which the above-stated features of the present disclosure are used, a more particular description of the content briefly summarized above may be made with reference to various aspects, some of which are illustrated in the accompanying drawings. However, it should be noted that the accompanying drawings only illustrate certain aspects of the present disclosure, and the description may admit of other equally effective aspects.

[0019] Figure 1 is a block diagram conceptually illustrating an example telecommunications system in accordance with certain aspects of the present disclosure.

[0020] Figure 2 is a block diagram conceptually illustrating designs of example base stations (BSs) and user equipment (UEs) in accordance with certain aspects of the present disclosure.

[0021] Figure 3 is a frame format for New Radio (NR) in accordance with certain aspects of the present disclosure.

[0022] Figure 4 An example vehicle-to-everything (V2X) communication system is illustrated in accordance with certain aspects of the present disclosure.

[0023] Figure 5 Another example V2X communication system in accordance with certain aspects of the present disclosure is illustrated.

[0024] Figure 6 is a diagram illustrating example resource pools in accordance with certain aspects of the present disclosure.

[0025] Figure 7is an explanation of some aspects of the present disclosure from Figure 6 Diagram of an adapted example resource pool.

[0026] Figure 8 is a flow diagram illustrating example operations for wireless communications by a UE in accordance with certain aspects of the present disclosure.

[0027] Fig. 9 Illustrated is a communications device that may include various components configured to perform operations for the techniques disclosed herein in accordance with certain aspects of the present disclosure.

[0028] To facilitate understanding, identical reference numerals have been used, where possible, to designate identical elements that are common to the figures. It is contemplated that elements disclosed in one aspect may be beneficially utilized in other aspects without specific recitation.

[0029] Detailed Description

[0030] Aspects of the present disclosure provide apparatus, methods, processing systems, and computer-readable media, for example, for low-power channel sensing for pedestrian user equipment (P-UE).

[0031] The following description provides an example of low-power channel sensing, but does not limit the scope, applicability or examples set forth in the claims. Changes may be made to the functions and arrangements of the elements discussed without departing from the scope of the present disclosure. Various examples may appropriately omit, replace, or add various procedures or components. For example, the described method may be performed in an order different from the order described, and various steps may be added, omitted, or combined. Moreover, the features described with reference to some examples may be combined in some other examples. For example, any number of aspects set forth herein may be used to implement a device or practice method. In addition, the scope of the present disclosure is intended to cover such devices or methods practiced using other structures, functionality, or structures and functionality that are supplementary to or different from the various aspects of the present disclosure set forth herein. It should be understood that any aspect of the present disclosure disclosed herein may be implemented by one or more elements of the claims. The wording "exemplary" is used herein to mean "used as an example, instance, or explanation". Any aspect described as "exemplary" herein is not necessarily to be interpreted as superior to or superior to other aspects.

[0032] In general, any number of wireless networks may be deployed in a given geographic area. Each wireless network may support a specific radio access technology (RAT) and may operate on one or more frequencies. RAT may also be referred to as a radio technology, air interface, etc. Frequency may also be referred to as a carrier, subcarrier, frequency channel, frequency tone, subband, etc. Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs.

[0033] The techniques described herein can be used for various wireless networks and radio technologies. For clarity, although various aspects may be described herein using terms commonly associated with 3G, 4G, and / or new radio (e.g., 5G NR) wireless technologies, various aspects of the present disclosure may be applied in communication systems based on other generations (including later generations of technologies).

[0034] NR access can support various wireless communication services, such as enhanced mobile broadband (eMBB) targeting wide bandwidth, millimeter wave (mmW) targeting high carrier frequency, massive machine type communication MTC (mMTC) targeting non-backward compatible MTC technology, and / or mission critical services targeting ultra-reliable low latency communication (URLLC). These services may include latency and reliability requirements. These services may also have different transmission time intervals (TTIs) to meet corresponding quality of service (QoS) requirements. In addition, these services can coexist in the same subframe.

[0035] The electromagnetic spectrum is typically subdivided into various classes, bands, channels, etc. based on frequency / wavelength. In 5G NR, two initial operating bands have been identified as frequency range designations FR1 (410 MHz–7.125 GHz) and FR2 (24.25 GHz–52.6 GHz). Frequencies between FR1 and FR2 are typically referred to as mid-band frequencies. Although a portion of FR1 is greater than 6 GHz, FR1 is typically (interchangeably) referred to as the “sub-6 GHz band” in various documents and articles. Similar naming issues sometimes arise regarding FR2, which is typically (interchangeably) referred to as the “millimeter wave” band in various documents and articles, although it is different from the extremely high frequency (EHF) band (30 GHz–300 GHz) identified as the “millimeter wave” band by the International Telecommunication Union (ITU).

[0036] In view of the above aspects, unless otherwise specifically stated, it should be understood that if used in this article, the term "sub-6 GHz" and the like can broadly represent frequencies that can be less than 6 GHz, can be within FR1, or can include mid-band frequencies. In addition, unless otherwise specifically stated, it should be understood that if used in this article, the term "millimeter wave" and the like can broadly represent frequencies that can include mid-band frequencies, can be within FR2, or can be within the EHF band.

[0037] NR may also support beamforming and may dynamically configure the beam direction. Multiple-input multiple-output (MIMO) transmission with precoding may also be supported. In some examples, MIMO configurations in the downlink (DL) may support up to 8 transmit antennas (with multi-layer DL transmissions of up to 8 streams) and up to 2 streams per UE. In some examples, multi-layer transmissions of up to 2 streams per UE may be supported. Aggregation of multiple cells may be supported using up to 8 serving cells.

[0038] Figure 1 An example wireless communication network 100 in which various aspects of the present disclosure may be performed is illustrated. For example, the wireless communication network 100 may be an NR system (e.g., a 5G NR network). The core network 132 may be in communication with one or more base stations (BSs) 110a-z (also each individually referred to herein as BSs 110 or collectively referred to herein as BSs 110) and / or user equipments (UEs) 120a-y (also each individually referred to herein as UEs 120 or collectively referred to herein as UEs 120) in the wireless communication network 100 via one or more interfaces.

[0039] BS 110 may provide communication coverage for a particular geographic area (sometimes referred to as a "cell"), which may be stationary or mobile depending on the location of a mobile BS. In some examples, BS 110 may be interconnected to each other and / or to one or more other BSs or network nodes (not shown) in wireless communication network 100 via various types of backhaul interfaces (e.g., direct physical connections, wireless connections, virtual networks, etc.) using any suitable transport network. Figure 1 In the example shown in , BSs 110a, 110b, and 110c may be macro BSs for macro cells 102a, 102b, and 102c, respectively. BS 110x may be a pico BS for a pico cell 102x. BSs 110y and 110z may be femto BSs for femto cells 102y and 102z, respectively. The BS may support one or more cells. BS 110 communicates with user equipment (UE) 120a-y (each also individually referred to herein as UE 120 or collectively referred to as UE 120) in the wireless communication network 100. UE 120 (e.g., 120x, 120y, etc.) may be dispersed throughout the wireless communication network 100, and each UE 120 may be stationary or mobile.

[0040] According to certain aspects, UE 120 can be configured for sidelink communications. Figure 1As shown in FIG. 1 , UE 120a includes channel sensing manager 122a, UE 120b includes channel sensing manager 122b, and BS 110a includes channel sensing manager 112a. According to aspects of the present disclosure, channel sensing manager 122a, channel sensing manager 122b, and / or channel sensing manager 112a may be configured for low power channel sensing.

[0041] The wireless communication network 100 may also include a relay station (e.g., relay station 110r) (also referred to as a relay, etc.) that receives transmissions of data and / or other information from an upstream station (e.g., BS 110a or UE 120r) and sends transmissions of the data and / or other information to a downstream station (e.g., UE 120 or BS 110), or the relay station relays transmissions between UEs 120 to facilitate communication between the devices.

[0042] A network controller 130 may couple to a set of BSs 110 and provide coordination and control for the BSs 110. The network controller 130 may communicate with the BSs 110 via a backhaul.

[0043] Figure 2 Illustrated are example components of a BS 110a and a UE 120a that may be used to implement aspects of the present disclosure (eg, in Figure 1 In the wireless communication network 100 of FIG. 1 , it may be a similar component in UE 120 b).

[0044] At BS 110a, a transmit processor 220 may receive data from a data source 212 and control information from a controller / processor 240. The control information may be for a physical broadcast channel (PBCH), a physical control format indicator channel (PCFICH), a physical hybrid ARQ indicator channel (PHICH), a physical downlink control channel (PDCCH), a group common PDCCH (GC PDCCH), etc. The data may be for a 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 place the UE in a discontinuous reception (DRX) mode to reduce power consumption of the UE. 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. The MAC-CE may also be used to convey information that facilitates communication, such as information about buffer status and available power headroom.

[0045] The processor 220 may process (e.g., encode and symbol map) data and control information to obtain data symbols and control symbols, respectively. The transmit processor 220 may also generate reference symbols (such as for a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a channel state information reference signal (CSI-RS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, and / or reference symbols, where applicable, and may provide an output symbol stream to a modulator (MOD) 232a-232t in a transceiver. Each modulator may process a corresponding 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 up-convert) the output sample stream to obtain a DL signal. The DL signals from the modulators 232a-232t in the transceiver may be transmitted via antennas 234a 234t, respectively.

[0046] At UE 120a, antennas 252a-252r may receive DL signals from BS 110a or sidelink signals from UE 120b, and may provide received signals to demodulators (DEMODs) 254a-254r in the transceiver, respectively. Each demodulator may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples. Each demodulator may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. A MIMO detector 256 may obtain received symbols from all demodulators 254a-254r in the transceiver, perform MIMO detection on the received symbols where applicable, and provide detected symbols. A receive processor 258 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for UE 120a to a data sink 260, and provide decoded control information to a controller / processor 280.

[0047] On the uplink (UL), at the UE 120a, a transmit processor 264 may receive and process data from a data source 262 (e.g., for a physical uplink shared channel (PUSCH)) and control information from a controller / processor 280 (e.g., for a physical uplink control channel (PUCCH)). The transmit processor 264 may also generate reference symbols for reference signals (e.g., a sounding reference signal (SRS)). The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266, if applicable, further processed by a demodulator 254a-254r in a transceiver (e.g., for SC-FDM, etc.), and transmitted to the BS 110a. At the BS 110a, the UL signal from the UE 120a may be received by the antenna 234, processed by the modulator, detected by the MIMO detector 236, if applicable, and further processed by the receive processor 238 to obtain decoded data and control information sent by the UE 120a. Receive processor 238 may provide decoded data to data sink 239 and decoded control information to controller / processor 240 .

[0048] Memory 242 and memory 282 may store data and program codes for BS 110a and UE 120a, respectively. A scheduler 244 may schedule UEs for data transmission on the DL and / or UL.

[0049] The antenna 252, processors 266, 258, 264, and / or controller / processor 280, and / or antenna 234, processors 220, 230, 238 of UE 120a may be used to perform the various techniques and methods described herein. Figure 2 As shown in FIG. 1 , the controller / processor 280 of the UE 120a has a channel sensing manager 281 and the controller / processor 240 of the BS 110a has a channel sensing manager 241. According to aspects of the present disclosure, the channel sensing manager 281 and / or the channel sensing manager 241 may be configured for low power channel sensing.

[0050] NR can utilize orthogonal frequency division multiplexing (OFDM) with cyclic prefix (CP) on UL and DL. NR can support half-duplex operation using time division duplex (TDD). OFDM and single carrier frequency division multiplexing (SC-FDM) divide the system bandwidth into multiple orthogonal subcarriers, which are also often called frequency modulation, frequency slot, etc. Each subcarrier can be modulated with data. Modulation codewords can be sent in the frequency domain with OFDM and in the time domain with SC-FDM. The spacing between adjacent subcarriers can be fixed, and the total number of subcarriers can depend on the system bandwidth. The minimum resource allocation (so-called resource block (RB)) can be 12 consecutive subcarriers. The system bandwidth can also be divided into subbands. For example, one subband can cover multiple RBs. NR can support a base subcarrier spacing (SCS) of 15KHz, and other SCSs (e.g., 30kHz, 60kHz, 120kHz, 240kHz, etc.) can be defined relative to the base SCS.

[0051] Figure 3 300 is a diagram showing an example of a frame format for NR. The transmission timeline for each of DL and UL may be divided into units of radio frames. Each radio frame may have a predetermined duration (e.g., 10 ms) and may be divided into 10 subframes with indices 0 to 9, each subframe being 1 ms. Each subframe may include a variable number of slots (e.g., 1, 2, 4, 8, 16, ... slots), depending on the SCS. Each slot may include a variable number of symbol periods (e.g., 7 or 14 symbols), depending on the SCS. An index may be assigned to the symbol period in each slot. A mini slot (which may be referred to as a subslot structure) refers to a transmission time interval having a duration less than a slot (e.g., 2, 3, or 4 symbols). Each symbol in a slot may indicate a link direction (e.g., DL, UL, or flexible) for data transmission, and the link direction for each subframe may be dynamically switched. The link direction may be based on the slot format. Each time slot may include DL / UL data and DL / UL control information.

[0052] In NR, synchronization signal blocks (SSBs) are transmitted. In certain aspects, each SSB 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 SSBs include the PSS, SSS, and a two-symbol PBCH. The SSBs may be transmitted at fixed timeslot locations (such as Figure 3) is transmitted in the codewords 0-3 shown in . PSS and SSS can be used by UE for cell search and acquisition. PSS can provide half-frame timing, and SS can provide CP length and frame timing. PSS and SSS can provide cell identity. PBCH carries some basic system information, such as DL system bandwidth, timing information within a radio frame, SS burst set periodicity, system frame number, etc. SSB can be organized into SS bursts to support beam sweeping. Further system information (such as remaining minimum system information (RMSI), system information block (SIB), other system information (OSI)) can be transmitted on the physical downlink shared channel (PDSCH) in certain subframes. SSB can be transmitted up to 64 times, for example, up to 64 different beam directions for millimeter waves. Multiple transmissions of SSB are called SS burst sets. SSBs in an SS burst set can be transmitted in the same frequency region, while SSBs in different SS burst sets can be transmitted in different frequency regions.

[0053] In some examples, access to the air interface may be scheduled. A scheduling entity (e.g., BS 110) allocates resources for communication between some or all devices and equipment within its service area or cell. The scheduling entity may be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communications, the subordinate entity utilizes resources allocated by the scheduling entity. BS 110 is not the only entity that can act as a scheduling entity. In some examples, UE 120 may act as a scheduling entity, and may schedule resources for one or more subordinate entities (e.g., one or more other UEs 120), and other UEs 120 may utilize resources scheduled by the UE 120 for wireless communication. In some examples, UE 120 may act as a scheduling entity in a peer-to-peer (P2P) network and / or in a mesh network. In a mesh network example, UE 120 may communicate directly with each other in addition to communicating with the scheduling entity.

[0054] In some examples, the communication between UE 120 and BS 110 is referred to as an access link. The access link may be provided via a Uu interface. The communication between devices may be referred to as a side link.

[0055] In some examples, two or more subordinate entities (e.g., UE 120) may use sidelink signals to communicate with each other. Real-world applications of such sidelink communications may include public safety, proximity services, UE-to-network relay, vehicle-to-vehicle (V2V) communications, Internet of Everything (IoE) communications, IoT communications, mission-critical mesh networks, and / or various other suitable applications. In general, a sidelink signal may refer to a signal that is communicated from one subordinate entity (e.g., UE 120a) to another subordinate entity (e.g., another UE 120) without relaying the communication through a scheduling entity (e.g., UE 120 or BS 110), even if the scheduling entity may be used for scheduling and / or control purposes. In some examples, sidelink signals may be communicated using licensed spectrum (unlike wireless local area networks, which typically use unlicensed spectrum). An example of sidelink communication is PC5, for example, as used in V2V, LTE, and / or NR.

[0056] 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 neighboring devices to discover each other. The PSCCH may carry control signaling (such as sidelink resource configuration and other parameters for data transmission), while the PSSCH may carry data transmission. The PSFCH may carry feedback, such as CSI related to the sidelink channel quality.

[0057] Roadside units (RSUs) may be utilized. RSUs may be used for V2I communications. In some examples, RSUs may act as forwarding nodes to extend the coverage of UEs. In some examples, RSUs may be co-located with BSs or may be self-contained. RSUs may have different classifications. For example, RSUs may be classified as UE-type RSUs and micro-node B-type RSUs. Micro NB-type RSUs have functionality similar to macro eNBs / gNBs. Micro NB-type RSUs may utilize Uu interfaces. UE-type RSUs may be used to meet stringent quality of service (QoS) requirements by minimizing conflicts and improving reliability. UE-type RSUs may use centralized resource allocation mechanisms to allow efficient resource utilization. Information (e.g., such as traffic conditions, weather conditions, congestion statistics, sensor data, etc.) may be broadcast to UEs in the coverage area. Relays may rebroadcast information received from some UEs. UE-type RSUs may be reliable synchronization sources.

[0058] Figure 4 and Figure 5 A diagrammatic representation of an example V2X system according to some aspects of the present disclosure is shown. For example, Figure 4 and Figure 5The illustrated vehicles may communicate via a sidelink channel and may perform sidelink CSI reporting as described herein.

[0059] Figure 4 and Figure 5 The V2X system provided in provides two complementary transmission modes. Figure 4 The first transmission mode, shown by way of example in FIG. 1 , involves direct communication between parties that are adjacent to each other in a local area (e.g., also referred to as sidelink communication). Figure 5 The second transmission mode illustrated by way of example in FIG. 8 involves network communication through a network, which may be implemented through a Uu interface (eg, a wireless communication interface between a radio access network (RAN) and a UE).

[0060] Reference Figure 4 , a V2X system 400 (e.g., including vehicle-to-vehicle (V2V) communications) is illustrated with two vehicles 402, 404. A first transmission mode allows direct communication between different parties in a given geographic location. As illustrated, the vehicles may have a wireless communication link 406 (V2P) with an individual (e.g., via a UE) through a PC5 interface. Communications between vehicles 402 and 404 may also occur through a PC5 interface 408. Communications (V2I) from vehicle 402 to other highway components (e.g., highway components 410, such as traffic signals or signs) may occur in a similar manner through a PC5 interface 412. For Figure 4 For each communication link illustrated in FIG. 4 , bidirectional communication can be performed between elements, so each element can be a transmitter and receiver of information. The V2X system 400 can be a self-managed system implemented without the assistance of a network entity. The self-managed system can achieve improved spectrum efficiency, reduced costs, and increased reliability because no network service interruption occurs during switching operations for moving vehicles. The V2X system can be configured to operate in a licensed or unlicensed spectrum, whereby any vehicle equipped with the system can access a common frequency and share information. Such coordinated / shared spectrum operations allow safe and reliable operations.

[0061] Figure 5A V2X system 550 is shown for communicating between a vehicle 552 and a vehicle 554 through a network entity 556. These network communications may occur through discrete nodes (such as BSs) that send information to and receive information from vehicles 552, 554 (e.g., relay information between vehicles 552, 554). Network communications through vehicle-to-network (V2N) links 558 and 510 may be used, for example, for long-range communications between vehicles, such as for communicating that there is a traffic accident at a distance ahead along a road or highway. Other types of communications may be sent by wireless nodes to vehicles, such as traffic flow conditions, road hazard warnings, environmental / weather reports, and service station availability, etc. Such data may be obtained from a cloud-based sharing service.

[0062] For example, in a V2X network, channel sensing may be used by a UE to allow multiple UEs to coexist. Channel sensing may allow a UE to avoid transmission collisions with other UEs. For example, channel sensing may allow a sensing UE to be aware of resource usage in a channel so that the sensing UE may avoid transmitting on resources currently being used by other UEs.

[0063] Channel sensing involves overhead. For example, it takes time (e.g., 100 ms) for a UE to perform channel sensing to obtain channel resource usage. In some systems, such as for vehicle UEs (V-UEs), channel sensing may be performed before each new transmission. Some UEs (such as P-UEs), for example, may have limited power budgets (e.g., compared to V-UEs). Thus, lower power channel sensing may be desired to maintain power while also avoiding conflicts with transmissions from other UEs (e.g., or reducing the probability of conflicts).

[0064] Example Low Power Channel Sensing for Pedestrian User Equipment (P-UE)

[0065] The effective transmit power efficiency used by a user equipment (UE) for channel sensing may be defined as the ratio of the actual power spent on transmission to the sum of the total power spent on transmission and sensing. Thus, the effective transmit power efficiency decreases as sensing increases.

[0066] In some examples, resources used for pedestrian-to-vehicle (P2V) and / or vehicle-to-pedestrian (V2P) communications may be in a resource pool. Figure 6 is a diagram illustrating an example resource pool according to certain aspects of the present disclosure. Figure 6As shown in , P2V / V2P resources can be time-division multiplexed (TDM) with non-P2V / V2P resources. In some examples, resources for channel sensing (e.g., P2V sensing opportunities) and resources for transmission (e.g., P2V transmit (TX) / receive (RX) opportunities) can be defined in the form of time slots and / or subframes.

[0067] According to certain aspects, a UE (e.g., a pedestrian UE (P-UE)) may adaptively determine a channel sensing duration and / or a transmission duration. For example, the UE may adaptively determine the channel sensing and / or transmission duration based on a channel congestion level of a channel. In some examples, during periods of light channel load (e.g., lower channel congestion levels), the UE may maximize the transmission time. During periods of high channel load (e.g., higher channel congestion levels), the UE may minimize conflicts by increasing the channel sensing time to obtain better resource mapping usage while maintaining a desired ratio of transmission time to sensing time. In some examples, based on the channel congestion level of a channel, the UE may use full channel sensing to transmit at certain times and may use random transmissions (e.g., no channel sensing) at other times.

[0068] According to certain aspects, channel congestion may be measured as a channel busy rate (CBR), a percentage of resources considered idle by controlling decoding, and / or a signal quality measurement such as reference signal received power (RSRP), received signal strength indicator (RSSI), or other measurements.

[0069] In some examples, a UE (e.g., a P-UE) performs measurements of channel congestion. In some examples, another device (e.g., a V-UE) performs channel congestion measurements and sends an indication of the channel congestion level to the UE.

[0070] In some examples, the UE may compare the channel congestion level with a threshold. Accordingly, the channel sensing may be adapted based on whether the channel congestion exceeds the threshold. That is, initial channel sensing (or coarse channel sensing) may be performed to obtain an initial channel congestion estimate (in Figure 6 602). Based on the initial channel congestion estimate, the adaptation of further sensing periods may be determined. In some examples, the UE may adjust channel sensing based on a configured association of channel congestion with channel sensing / transmission time / ratio (e.g., based on a configured table, mapping, etc.).

[0071] According to certain aspects, the UE may be configured to wake up periodically (e.g., every N time slots). When the UE wakes up, the UE may perform channel sensing (e.g., for the P2V pool) during a number of time slots n1 (e.g., logically consecutive sensing time slots in the P2V resource pool) to determine resource availability. The UE may then communicate (e.g., continuously transmit / receive) during n2 available time slots (e.g., logically consecutive TX / RX time slots in the P2V resource pool). According to various aspects of the present disclosure, the UE may adaptively determine n1 and n2 parameters based on the channel congestion level. For example, in the time slot in which the UE wakes up, the UE may determine (e.g., measure or receive) the channel congestion level and determine n1 and n2 parameters (sensing and transmission / reception parameters, respectively).

[0072] In an illustrative example, the P-UE may start with a sensing parameter n1=1. The P-UE may measure the channel in the first time slot. If CBR<x (e.g., x=0.2), the P-UE stops sensing more time slots (e.g., congestion is low, so the UE maximizes transmission time). That is, the P-UE infers the resource mapping from the n1=1 sensing duration, and thereafter performs transmission for the configured n2 time slots. On the other hand, if x<CBR<y (e.g., x=0.2, y=0.3), the P-UE may perform sensing on additional time slots to obtain the resource mapping before transmitting. That is, in this case, n1=2 time slots (for sensing). And if CBR>z (e.g., z=0.9), the P-UE may sense n1=5 time slots (e.g., because the channel is very congested).

[0073] After the sensing phase, the P-UE selects the n2 parameter and transmits in n2 time slots (e.g., continuously). In some examples, the n2 parameter may be selected based on a target transmit power efficiency ratio and the n1 parameter. For example, the desired transmit power efficiency ratio (η) may be defined as In some examples, the transmit power efficiency parameter η may be a decreasing function of channel congestion (eg, CBR). That is, if the channel congestion is smaller, more consecutive transmissions may be performed (eg, using a higher n2 parameter).

[0074] For example, Figure 6As shown in , a UE (e.g., a P-UE) may be configured to wake up every four time slots for P2V (e.g., N=4 resource pools). The UE may start with sensing parameter n1=2 and parameter n2=3. Thus, the UE may be configured to perform sensing (e.g., measure the channel) in the first two logically consecutive time slots (P2V sensing opportunity 602 and P2V sensing opportunity 604) in the P2V resource pool, then transmit and / or receive on the channel in the next three logically consecutive time slots (P2V TX / RX opportunity 606, P2V TX / RX opportunity 608, and P2V TX / RX opportunity 610), then perform sensing in the next two logically consecutive time slots (P2V sensing opportunity 612 and P2V sensing opportunity 614), and so on.

[0075] According to various aspects of the present disclosure, the UE may compare the measured channel congestion level of the channel with the channel congestion threshold level and adjust the n1 and / or n2 parameters (e.g., adjust the sensing duration and / or the transmission / reception duration). For example, the UE may adjust the n1 parameter (i.e., the sensing duration) to 1 and the n2 parameter (i.e., the transmission / reception duration) to 5, such as Figure 7 As shown in .

[0076] For example, when congestion is low (e.g., below a congestion threshold level), the UE may maximize the transmission time. Accordingly, the UE may sense in P2V sensing opportunity 702 and transmit and / or receive in the next logically consecutive time slots (P2V TX / RX opportunity 704, P2V TX / RX opportunity 706, P2V TX / RX opportunity 708, P2V TX / RX opportunity 710, P2V TX / RX opportunity 712) in the P2V resource pool. The UE may perform sensing again at P2V sensing opportunity 714, and so on.

[0077] According to some aspects, the sensing duration (n1) may be equal to 0. In this case, another device (e.g., V-UE) may perform channel congestion measurements and send an indication to the UE; therefore, the UE may not perform channel measurements. Based on the indicated channel measurements, the UE may determine the sensing and transmission durations (e.g., n1 and n2 parameters) to adapt the sensing / transmission scheme accordingly.

[0078] According to certain aspects, the UE may change or randomly select frequency resources in the n2 transmission time slots to further avoid collisions. For example, the UE may randomly select a physical resource block (PRB) for each of its transmissions in the n2 time slots from a resource availability map obtained during the sensing phase.

[0079] According to certain aspects, the UE may also adapt its transmit power (eg, P t =αPmax ), where P t is the transmit power of the UE and P max is the maximum transmit power, and 0≤α≤1. When the UE does not receive a page (eg, from any V-UE) in a time window of T seconds / time slots, the UE may adjust the transmit power (eg, select / apply the α parameter).

[0080] Figure 8 8 is a flow diagram illustrating example operations 800 for wireless communication in accordance with certain aspects of the present disclosure. Operations 800 may be performed, for example, by a UE (e.g., such as UE 120a or UE 120b in wireless communication network 100, which may be a P-UE). In some examples, the UE is a P-UE in a V2P security system.

[0081] Operation 800 may be implemented as a processor on one or more processors (e.g., Figure 2 Further, in operation 800, the transmission and reception of signals by the UE may be performed, for example, by one or more antennas (e.g., Figure 2 In some aspects, signal transmission and / or reception by the UE may be achieved by obtaining and / or outputting signals via a bus interface of one or more processors (eg, controller / processor 280).

[0082] Operations 800 may begin at block 805, with the UE determining a channel congestion level of the channel during a first sensing duration. For example, the UE may determine a CBR, a percentage of idle resources based on control information, a channel quality measurement, and / or a signal strength measurement. Determining the channel congestion level of the channel may involve performing channel congestion measurements. Determining the channel congestion level of the channel may include receiving an indication of the channel congestion level from a sidelink UE, a BS, and / or a V-UE.

[0083] In box 810, the UE determines a second sensing duration and a transmission duration based on a channel congestion level of the channel (e.g., determined from the first sensing duration in box 805). In some examples, the UE may adaptively determine a ratio of sensing time to transmission time based on the channel congestion level of the channel. When the determined channel congestion level of the channel is high, the UE may determine a longer sensing duration, and when the determined channel congestion level of the channel is low, the UE may determine a shorter sensing duration. In some examples, the UE may compare the channel congestion level of the channel with a threshold, and the UE may adjust the second sensing duration based on whether the channel congestion level of the channel exceeds the threshold. In some examples, the UE may select the second sensing duration based on a mapping of the configured channel congestion level to sensing duration.

[0084] In some examples, the UE determines resources to be used for the sensing channel from the P2V resource pool. In some examples, the P2V resource pool is time division multiplexed (TDM) with non-P2V pool resources. In some examples, the UE randomly selects different frequency resources for transmission in different time resources.

[0085] At block 815, the UE senses the channel for a second sensing duration.

[0086] In some examples, optionally, at block 820, the UE determines to transmit or suppress transmission on the channel based on sensing the channel within the second sensing duration. For example, the UE senses (and / or receives) in n1 logically consecutive time slots of 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 start transmitting (e.g., in the next available P2V TX / RX opportunity).

[0087] In some examples, optionally, at block 825, the UE randomly selects different resources for transmission in different time resources.

[0088] At block 830, the UE transmits on the channel within the transmission duration. For example, the UE transmits (and / or receives) in n2 logically consecutive time slots of the P2V resource pool. In some examples, the UE adaptively determines the transmit power to be used for transmission based on the duration since the paging was received.

[0089] In some examples, the UE determines a first number of consecutive time slots for sensing the channel and a second number of consecutive time slots for transmitting to the V-UE. The first and second number of time slots can be adaptively determined based on a channel congestion level of the channel. The first and second number of time slots can be further determined based on a target ratio of sensing time to transmission time. In some examples, the UE adaptively determines the target ratio based on the channel congestion level of the channel.

[0090] Fig. 9 The description may include operations configured to perform the techniques disclosed herein, such as, Figure 8 900 includes various components (e.g., corresponding to means-plus-function components) of the communication device 900 and the operations explained in the foregoing. The communication device 900 includes a processing system 902 coupled to a transceiver 908 (e.g., a transmitter and / or a receiver). The transceiver 908 is configured to transmit and receive signals (such as the various signals described herein) for the communication device 900 via an antenna 910. The processing system 902 can be configured to perform processing functions for the communication device 900, including processing signals received and / or to be transmitted by the communication device 900.

[0091] The processing system 902 includes a processor 904 coupled to a computer-readable medium / memory 912 via a bus 906. In some aspects, the computer-readable medium / memory 912 is configured to store instructions (e.g., computer-executable code) that, when executed by the processor 904, cause the processor 904 to perform Figure 8 912 or other operations for performing the various techniques discussed herein for coordinating sidelink power saving configurations. In some aspects, the computer-readable medium / memory 912 stores: code 914 for determining (e.g., for determining a channel congestion level of a channel during a first sensing duration); code 916 for determining (e.g., for determining a second sensing duration and a transmission duration based on the channel congestion level of the channel); code 918 for sensing (e.g., for sensing the channel within the second sensing duration); code 920 for determining (e.g., for determining to transmit or suppress transmission on the channel based on sensing the channel within the second sensing duration); code 922 for randomly selecting (e.g., for randomly selecting different frequency resources for transmission in different time resources); and / or code 924 for transmitting (e.g., for transmitting on the channel within the transmission duration). In some aspects, the processor 904 has a circuit system configured to implement the code stored in the computer-readable medium / memory 912. Processor 904 includes: a circuit system 926 for determining (e.g., for determining a channel congestion level of a channel during a first sensing duration); a circuit system 928 for determining (e.g., for determining a second sensing duration and a transmission duration based on the channel congestion level determined from the first sensing duration); a circuit system 930 for sensing (e.g., for sensing the channel within the second sensing duration); a circuit system 932 for determining (e.g., for determining to transmit or to suppress transmission on the channel based on sensing the channel within the second sensing duration); a circuit system 934 for randomly selecting (e.g., for randomly selecting different frequency resources for transmission in different time resources); and / or a circuit system 936 for transmitting (e.g., for transmitting on the channel within the transmission duration).

[0092] Example aspects

[0093] Aspect 1: A method for wireless communication by a user equipment (UE), comprising: determining a channel congestion level of a channel during a first sensing duration; determining a second sensing duration and a transmission duration based on the channel congestion level of the channel; sensing the channel within the second sensing duration; and transmitting on the channel within the transmission duration.

[0094] Aspect 2: The method of aspect 1 further comprises: determining to transmit or refrain from transmitting on the channel based on sensing the channel within a second sensing duration.

[0095] Aspect 3: A method as in aspect 1 or 2, wherein determining the second sensing duration comprises: adaptively determining a ratio of sensing time to transmission time based on a channel congestion level of the channel; and determining the second sensing duration and the transmission duration based on the ratio of sensing time to transmission time.

[0096] Aspect 4: The method of any one of aspects 1-3, wherein determining the second sensing duration comprises: determining that the duration for the second sensing duration is longer when the channel congestion level of the channel is higher than the duration for the second sensing duration when the channel congestion level of the channel is lower.

[0097] Aspect 5: The method of aspect 4, wherein determining the second sensing duration comprises: comparing a channel congestion level of the channel with a channel congestion threshold level; and adjusting the second sensing duration based on whether the channel congestion level of the channel exceeds the channel congestion threshold level.

[0098] Aspect 6: The method of aspect 4 or 5, wherein determining the second sensing duration comprises: selecting the second sensing duration based on a configured mapping of channel congestion levels of the channel to sensing durations.

[0099] Aspect 7: The method of any one of aspects 1-6, wherein determining the channel congestion level comprises determining a channel busy rate (CBR).

[0100] Aspect 8: The method of any one of aspects 1-7, wherein determining the channel congestion level comprises determining a percentage of idle resources based on control information.

[0101] Aspect 9: The method of any of aspects 1-8, wherein determining a channel congestion level comprises determining a channel quality measure.

[0102] Aspect 10: The method of any of aspects 1-9, wherein determining a channel congestion level comprises determining a signal strength measurement.

[0103] Aspect 11: The method of any of aspects 1-10, wherein determining the channel congestion level comprises performing channel congestion measurements.

[0104] Aspect 12: The method of any of Aspects 1-11, wherein determining the channel congestion level comprises receiving an indication of the channel congestion level for the channel from a sidelink UE.

[0105] Aspect 13: The method of any of aspects 1-12, wherein determining the channel congestion level comprises receiving an indication of the channel congestion level for the channel from a base station (BS).

[0106] Aspect 14: The method of any of Aspects 1-13, wherein determining the channel congestion level comprises receiving an indication of the channel congestion level for the channel from a vehicle UE (V-UE).

[0107] Aspect 15: The method according to any one of aspects 1-14, wherein the UE comprises a pedestrian UE (P-UE).

[0108] Aspect 16: The method of Aspect 15, wherein determining the second sensing duration comprises determining resources to be used for sensing the channel from a pedestrian-to-vehicle (P2V) resource pool, and wherein the P2V resource pool is time division multiplexed (TDM) with one or more non-P2V resource pools.

[0109] Aspect 17: A method as in Aspect 15 or 16, wherein: determining the second sensing duration includes determining a first number of consecutive time slots for sensing the channel; determining the transmission duration includes determining a second number of consecutive time slots for transmitting to a vehicle UE (V-UE); and the first number of consecutive time slots and the second number of consecutive time slots are adaptively determined based on a channel congestion level of the channel.

[0110] Aspect 18: The method of aspect 17, wherein the first number of consecutive time slots and the second number of consecutive time slots are determined further based on a target ratio of sensing time to transmission time.

[0111] Aspect 19: The method of aspect 18, further comprising adaptively determining a target ratio of sensing time to transmission time based on a channel congestion level of the channel.

[0112] Aspect 20: The method according to any one of aspects 15-19, wherein the P-UE is in a vehicle-to-pedestrian (V2P) safety system.

[0113] Aspect 21: The method according to any one of aspects 1-20, further comprising randomly selecting different frequency resources for transmission in different time resources.

[0114] Aspect 22: The method of any of Aspects 1-21, further comprising adaptively determining a transmit power to be used for transmitting on the channel based on a duration since receiving the page.

[0115] Aspect 23: An apparatus comprises: at least one processor and a memory coupled to the at least one processor, the memory comprising code, the code being executable by the at least one processor to cause the apparatus to perform the method as in any one of aspects 1-22.

[0116] Aspect 24: A computer-readable medium having stored thereon a computer-executable code for wireless communication, the computer-executable code causing an apparatus to perform the method of any one of aspects 1-22 when executed by at least one processor.

[0117] Aspect 25: An apparatus comprising at least one means for performing the method of any one of aspects 1-22.

[0118] Additional considerations

[0119] The techniques described herein may be used for various wireless communication technologies, such as NR (e.g., 5G NR), 3GPP Long Term Evolution (LTE), Advanced LTE (LTE-A), Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), Time Division Synchronous Code Division Multiple Access (TD-SCDMA), and other networks. The terms "network" and "system" are often used interchangeably. A CDMA network may implement radio technologies such as Universal Terrestrial Radio Access (UTRA), cdma2000, and the like. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. cdma2000 covers IS-2000, IS-95, and IS-856 standards. A TDMA network may implement radio technologies such as Global System for Mobile Communications (GSM). OFDMA networks can implement radio technologies such as NR (e.g., 5G RA), Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDMA, etc. UTRA and E-UTRA are part of Universal Mobile Telecommunications System (UMTS). LTE and LTE-A are versions of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, and GSM are described in documents from an organization named "3rd Generation Partnership Project" (3GPP). cdma2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2). NR is an emerging wireless communication technology under development.

[0120] In 3GPP, the term "cell" may refer to the coverage area of ​​a B node (NB) and / or a NB subsystem serving the coverage area, depending on the context in which the term is used. In NR systems, the terms "cell" and BS, next-generation B node (gNB or g B node), access point (AP), distributed unit (DU), carrier, or transmission reception point (TRP) may be used interchangeably. The BS may provide communication coverage for macro cells, pico cells, femto cells, and / or other types of cells. A macro cell may cover a relatively large geographic area (e.g., a radius of several thousand meters) and may allow unrestricted access by UEs with service subscriptions. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscriptions. A femto cell may cover a relatively small geographic area (e.g., a residence) and may allow restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG), UEs of users in a residence, etc.). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS.

[0121] UE may also be referred to as a mobile station, terminal, access terminal, subscriber unit, station, customer premises equipment (CPE), cellular phone, smart phone, personal digital assistant (PDA), wireless modem, wireless communication device, handheld device, laptop computer, cordless phone, wireless local loop (WLL) station, tablet computer, camera, gaming device, netbook, smartbook, ultrabook, appliance, medical device or medical equipment, biometric sensor / device, wearable device (such as smart watch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet, etc.)), entertainment device (e.g., music device, video device, satellite radio, etc.), transportation component or sensor, smart meter / sensor, industrial manufacturing equipment, global positioning system device, or any other suitable device configured to communicate via wireless or wired medium. Some UEs may be considered machine type communication (MTC) devices or evolved MTC (eMTC) devices. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., which can communicate with a BS, another device (e.g., a remote device), or some other entity. A wireless node can provide connectivity for or to a network (e.g., a wide area network (such as the Internet) or a cellular network), for example, via a wired or wireless communication link. Some UEs may be considered Internet of Things (IoT) devices, which may be narrowband IoT (NB-IoT) devices.

[0122] Each method disclosed herein includes one or more steps or actions for implementing the method. These method steps and / or actions can be interchangeable with each other without departing from the scope of the claims. In other words, unless a specific order of steps or actions is specified, the order and / or use of specific steps and / or actions can be changed without departing from the scope of the claims.

[0123] As used herein, a phrase referring to "at least one of" a list of items refers to any combination of those items, including single members. As an example, "at least one of a, b, or c" is intended to cover: a, b, c, ab, ac, bc, and abc, as well as any combination with multiple identical elements (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other ordering of a, b, and c).

[0124] As used herein, the term "determining" encompasses a wide variety of actions. For example, "determining" may include calculating, computing, processing, deriving, investigating, searching (e.g., searching in a table, a database, or another data structure), ascertaining, and the like. Also, "determining" may include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory), and the like. Also, "determining" may include resolving, selecting, choosing, establishing, and the like.

[0125] The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be easily understood by those skilled in the art, and the universal principles defined herein can be applied to other aspects. Thus, the claims are not intended to be limited to the various aspects shown herein, but should be granted the full scope consistent with the language of the claims, wherein the singular reference to the element is not intended to mean "there is and only one" (unless specifically stated) but "one or more". Unless otherwise specifically stated, the term "some / some" refers to one or more. The elements of the various aspects described throughout this disclosure are all structural and functional equivalents currently or hereafter known to those of ordinary skill in the art and are expressly incorporated herein by reference, and are intended to be covered by the claims. In addition, nothing disclosed herein is intended to be donated to the public, regardless of whether such disclosure is explicitly recorded in the claims. Any element of the claim should not be interpreted under the provisions of 35 U.S.C. § 112 (f), unless the element is explicitly stated using the phrase "device for..." or in the case of a method claim, the element is stated using the phrase "step for...".

[0126] The various operations of the methods described above may be performed by any suitable device capable of performing the corresponding functions. These devices may include various hardware and / or software components and / or modules, including but not limited to circuits, application specific integrated circuits (ASICs), or processors. Generally, where there are operations illustrated in the accompanying drawings, these operations may have corresponding paired device-plus-function components with similar numbers.

[0127] The various illustrative logical blocks, modules, and circuits described in conjunction with the present disclosure may be implemented or executed with a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device (PLD), discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any commercially available processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

[0128] If implemented in hardware, an example hardware configuration may include a processing system in a wireless node. The processing system may be implemented using a bus architecture. Depending on the specific application and overall design constraints of the processing system, the bus may include any number of interconnecting buses and bridges. The bus may link together various circuits including a processor, a machine-readable medium, and a bus interface. The bus interface may be used to connect a network adapter, etc., to the processing system via the bus. The network adapter may be used to implement the signal processing functions of the PHY layer. In the user terminal 120 (see Figure 1 ), a user interface (e.g., a keypad, display, mouse, joystick, etc.) may also be connected to the bus. The bus may also link various other circuits, such as timing sources, peripherals, voltage regulators, power management circuits, and the like, which are well known in the art and will not be described further. The processor may be implemented with one or more general and / or special purpose processors. Examples include microprocessors, microcontrollers, DSP processors, and other circuit systems capable of executing software. Those skilled in the art will recognize how to best implement the functionality described with respect to the processing system, depending on the specific application and the overall design constraints imposed on the overall system.

[0129] If implemented in software, each function may be stored on or transmitted by a computer-readable medium as one or more instructions or codes. Software should be broadly interpreted to mean instructions, data, or any combination thereof, whether referred to as software, firmware, middleware, microcode, hardware description language, or other. Computer-readable media include both computer storage media and communication media, which include any media that facilitate the transfer of computer programs from one place to another. The processor may be responsible for managing the bus and general processing, including executing software modules stored on a machine-readable storage medium. A computer-readable storage medium may be coupled to a processor so that the processor can read and write information from / to the storage medium. In an alternative, a storage medium may be integrated into a processor. As an example, a machine-readable medium may include a transmission line, a carrier modulated by data, and / or a computer-readable storage medium having instructions stored thereon that is separated from a wireless node, all of which may be accessed by a processor through a bus interface. Alternatively or additionally, a machine-readable medium or any part thereof may be integrated into a processor, such as a cache and / or a general register file, which may be the case. As an example, examples of machine-readable storage media may include RAM (random access memory), flash memory, ROM (read only memory), PROM (programmable read only memory), EPROM (erasable programmable read only memory), EEPROM (electrically erasable programmable read only memory), registers, magnetic disks, optical disks, hard drives, or any other suitable storage media, or any combination thereof. Machine-readable media may be implemented in a computer program product.

[0130] A software module may include a single instruction, or many instructions, and may be distributed over several different code segments, distributed between different programs, and distributed across multiple storage media. A computer-readable medium may include several software modules. These software modules include instructions that cause a processing system to perform various functions when executed by an apparatus such as a processor. These software modules may include a transmission module and a receiving module. Each software module may reside in a single storage device or may be distributed across multiple storage devices. As an example, when a triggering event occurs, a software module may be loaded into a RAM from a hard drive. During the execution of a software module, a processor may load some instructions into a cache to increase access speed. One or more cache lines may then be loaded into a general register file for execution by the processor. When describing the functionality of a software module as described below, it will be understood that such functionality is implemented by the processor when the processor executes instructions from the software module.

[0131] Likewise, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technology (such as infrared (IR), radio, and microwave), then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technology (such as infrared, radio, and microwave) is included in the definition of medium. Disk and disc, as used herein, include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk, and Blu-ray Disks, where disks often reproduce data magnetically, and discs reproduce data optically with lasers. Thus, in some aspects, computer-readable media may include non-transitory computer-readable media (e.g., tangible media). Additionally, for other aspects, computer-readable media may include transient computer-readable media (e.g., signals). Combinations of the above should also be included within the scope of computer-readable media.

[0132] Thus, certain aspects may include a computer program product for performing the operations presented herein. For example, such a computer program product may include a computer-readable medium having stored (and / or encoded) thereon instructions that can be executed by one or more processors to perform the operations described herein, such as for performing the operations described herein and in Figure 8 Instructions for the operations explained in .

[0133] In addition, it should be appreciated that modules and / or other appropriate means for performing the methods and techniques described herein may be downloaded and / or otherwise obtained by a user terminal and / or base station where applicable. For example, such a device can be coupled to a server to facilitate the transfer of means for performing the methods described herein. Alternatively, the various methods described herein can be provided via a storage device (e.g., RAM, ROM, a physical storage medium such as a compact disc (CD) or a floppy disk, etc.) so that once the storage device is coupled to or provided to a user terminal and / or base station, the device can obtain the various methods. In addition, any other suitable technology suitable for providing the methods and techniques described herein to a device may be utilized.

[0134] It will be understood that the claims are not limited to the precise configuration and components illustrated above. Various changes, substitutions and variations may be made in the arrangement, operation and details of the methods and apparatus described above without departing from the scope of the claims.

Claims

1. An apparatus for wireless communication by a pedestrian user equipment (P-UE), comprising: Memory; as well as at least one processor coupled to the memory and configured to: determining a channel congestion level of the channel during a first sensing duration; determining a second sensing duration and a transmission duration for sensing the channel from a pedestrian-to-vehicle (P2V) resource pool based on the channel congestion level of the channel, wherein the P2V resource pool is time division multiplexed (TDM) with one or more non-P2V resource pools; sensing the channel within the second sensing duration; as well as Transmitting on the channel for the transmission duration.

2. The apparatus of claim 1 , wherein the at least one processor coupled to the memory is further configured to: Determining to transmit or to refrain from transmitting on the channel is based on sensing the channel within the second sensing duration.

3. The apparatus of claim 1 , wherein the at least one processor coupled to the memory is configured to: adaptively determining a ratio of sensing time to transmission time based on the channel congestion level of the channel; and The second sensing duration and the transmission duration are determined based on the ratio of sensing time to transmission time.

4. The apparatus of claim 1 , wherein the at least one processor coupled to the memory is configured to: A duration for the second sensing duration is determined to be longer when the channel congestion level for the channel is higher than a duration for the second sensing duration when the channel congestion level for the channel is lower.

5. The apparatus of claim 4, wherein the at least one processor coupled to the memory is configured to: comparing the channel congestion level of the channel to a channel congestion threshold level; and The second sensing duration is adjusted based on whether the channel congestion level of the channel exceeds the channel congestion threshold level.

6. The apparatus of claim 4, wherein the at least one processor coupled to the memory is configured to: The second sensing duration is selected based on a configured mapping of channel congestion levels of the channel to sensing durations.

7. The apparatus of claim 1, wherein the at least one processor coupled to the memory is configured to determine the channel congestion level of the channel comprises determining a channel busy rate (CBR).

8. The apparatus of claim 1, wherein the at least one processor coupled to the memory is configured to determine the channel congestion level of the channel comprises determining a percentage of free resources based on control information.

9. The apparatus of claim 1, wherein the at least one processor coupled to the memory is configured to determine the channel congestion level of the channel comprises determining a channel quality measurement.

10. The apparatus of claim 1, wherein the at least one processor coupled to the memory is configured to determine the channel congestion level of the channel comprises determining a signal strength measurement.

11. The apparatus of claim 1, wherein the at least one processor coupled to the memory is configured to determine the channel congestion level of the channel comprises performing a channel congestion measurement.

12. The apparatus of claim 1, wherein the at least one processor coupled to the memory is configured to determine the channel congestion level for the channel comprises receiving an indication of the channel congestion level for the channel from a sidelink UE.

13. The apparatus of claim 1, wherein the at least one processor coupled to the memory is configured to determine the channel congestion level for the channel comprises receiving an indication of the channel congestion level for the channel from a network node.

14. The apparatus of claim 1, wherein the at least one processor coupled to the memory is configured to determine the channel congestion level of the channel comprises receiving an indication of the channel congestion level of the channel from a vehicle UE V-UE.

15. The apparatus of claim 1, wherein the P-UE is in a vehicle-to-pedestrian (V2P) safety system.

16. The apparatus of claim 1, the at least one processor coupled to the memory further configured to randomly select different frequency resources for transmission in different time resources.

17. An apparatus for wireless communication by a pedestrian user equipment (P-UE), comprising: Memory; as well as at least one processor coupled to the memory and configured to: determining a channel congestion level of the channel during a first sensing duration; adaptively determining, based on the channel congestion level of the channel, a second sensing duration comprising a first number of consecutive time slots for sensing the channel; adaptively determining a transmission duration comprising a second number of consecutive time slots for transmitting to a vehicle UE V-UE based on the channel congestion level of the channel; sensing the channel within the second sensing duration; as well as Transmitting on the channel for the transmission duration.

18. The apparatus of claim 17, wherein the at least one processor coupled to the memory is configured to adaptively determine the first number of consecutive time slots and the second number of consecutive time slots further based on a target ratio of sensing time to transmission time.

19. The apparatus of claim 18, wherein the at least one processor coupled to the memory is further configured to adaptively determine the target ratio of sensing time to transmission time based on the channel congestion level of the channel.

20. An apparatus for wireless communication by a user equipment UE, comprising: Memory; as well as at least one processor coupled to the memory and configured to: determining a channel congestion level of the channel during a first sensing duration; determining a second sensing duration and a transmission duration for sensing the channel based on the channel congestion level of the channel; adaptively determining a transmit power to be used for transmitting on the channel based on a duration since receiving the page; sensing the channel within the second sensing duration; as well as The transmit power is used to transmit on the channel for the transmission duration.

21. A method for wireless communication by a pedestrian user equipment (P-UE), comprising: adaptively determining a channel congestion level of the channel during a first sensing duration; adaptively determining, based on the channel congestion level of the channel, a second sensing duration comprising a first number of consecutive time slots for sensing the channel; adaptively determining a transmission duration comprising a second number of consecutive time slots for transmitting to a vehicle UE V-UE based on the channel congestion level of the channel; sensing the channel within the second sensing duration; as well as Transmitting on the channel for the transmission duration.

22. The method of claim 21, further comprising: A determination is made based on the channel sensing to transmit or to refrain from transmitting on the channel.

23. The method of claim 21 , wherein determining the second sensing duration comprises: A ratio of sensing time to transmission time is adaptively determined based on the channel congestion level of the channel.

24. The method of claim 23, wherein determining the second sensing duration and the transmission duration is based on the ratio of sensing time to transmission time.

25. The method of claim 21, wherein determining the second sensing duration comprises: A duration for the second sensing duration is determined to be longer when the channel congestion level for the channel is higher than a duration for the second sensing duration when the channel congestion level for the channel is lower.

26. The method of claim 25, wherein determining the second sensing duration comprises: comparing the channel congestion level of the channel to a channel congestion threshold level; as well as The second sensing duration is adjusted based on whether the channel congestion level of the channel exceeds the channel congestion threshold level.

27. The method of claim 25, wherein determining the second sensing duration comprises: The second sensing duration is selected based on a configured mapping of channel congestion levels of the channel to sensing durations.

28. The method of claim 21, determining the channel congestion level of the channel comprises determining a channel busy rate (CBR).

29. The method of claim 21, wherein determining the channel congestion level of the channel comprises determining a percentage of free resources based on control information.

30. The method of claim 21, wherein determining the channel congestion level of the channel comprises determining a channel quality measurement.

31. The method of claim 21, wherein determining the channel congestion level of the channel comprises determining a signal strength measurement.

32. The method of claim 21, wherein determining the channel congestion level of the channel comprises: Perform channel congestion measurements.

33. The method of claim 21, wherein determining the channel congestion level of the channel comprises: An indication of the channel congestion level for the channel is received from a sidelink UE.

34. The method of claim 21, wherein determining the channel congestion level for the channel comprises receiving an indication of the channel congestion level for the channel from a network node.

35. The method of claim 21, wherein determining the channel congestion level for the channel comprises receiving an indication of the channel congestion level for the channel from a vehicle UE V-UE.

36. The method of claim 21, wherein the P-UE is in a vehicle-to-pedestrian (V2P) safety system.

37. The method of claim 21, further comprising: Different frequency resources are randomly selected for transmission in different time resources.

38. A method for wireless communication by a pedestrian user equipment (P-UE), comprising: determining a channel congestion level of the channel during a first sensing duration; adaptively determining, based on the channel congestion level of the channel, a second sensing duration comprising a first number of consecutive time slots for sensing the channel; adaptively determining a transmission duration comprising a second number of consecutive time slots for transmitting to a vehicle UE V-UE based on the channel congestion level of the channel; sensing the channel within the second sensing duration; as well as Transmitting on the channel for the transmission duration.

39. The method of claim 38, wherein the first number of consecutive time slots and the second number of consecutive time slots are adaptively determined further based on a target ratio of sensing time to transmission time.

40. The method of claim 39, wherein the target ratio of sensing time to transmission time is adaptively determined based on the channel congestion level of the channel.

41. A method for wireless communication by a user equipment UE, comprising: determining a channel congestion level of the channel during a first sensing duration; determining a second sensing duration and a transmission duration for sensing the channel based on the channel congestion level of the channel; adaptively determining a transmit power to be used for transmitting on the channel based on a duration since receiving the page; sensing the channel within the second sensing duration; as well as The transmit power is used to transmit on the channel for the transmission duration.

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