CN117242872A - Inter-user equipment coordination for resource pools - Google Patents

Abstract

Aspects of the present disclosure generally relate to wireless communications. In some aspects, a first User Equipment (UE) may select an inter-UE coordination scheme configured for a resource pool associated with the first UE from stored configuration information or received indications. The UE may send, to the second UE, an indication of one or more of the preferred or non-preferred side uplink resources for transmission from the second UE to the first UE based at least in part on the inter-UE coordination scheme. Numerous other aspects are also presented.

Description

Inter-user equipment coordination for resource pools

Cross Reference to Related Applications

This patent application claims priority to enjoying the following applications: U.S. provisional patent application No.63/187,338, entitled "INTER USER EQUIPMENT COORDINATION FOR RESOURCE POOLS," filed 5/11 at 2021; and U.S. non-provisional patent application No.17/662,831 entitled "INTER USER EQUIPMENT COORDINATION FOR RESOURCE POOLS," filed 5/10 at 2022, which is expressly incorporated herein by reference.

Technical Field

Aspects of the present disclosure relate generally to wireless communications and to techniques and apparatus for inter-user equipment coordination for a resource pool.

Background

Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcast. A typical wireless communication system may employ multiple-access techniques capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple-access techniques include 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, time division synchronous code division multiple access (TD-SCDMA) systems, and Long Term Evolution (LTE). LTE/LTE-advanced is an enhanced set of mobile standards for Universal Mobile Telecommunications System (UMTS) promulgated by the third generation partnership project (3 GPP).

A wireless network may include one or more base stations that support communication for a User Equipment (UE) or multiple UEs. The UE may communicate with the base station via downlink and uplink communications. "downlink" (or "DL") refers to the communication link from a base station to a UE, and "uplink" (or "UL") refers to the communication link from a UE to a base station. As will be described in more detail herein, a BS may be referred to as a node B, gNB, an Access Point (AP), a radio head, a Transmission and Reception Point (TRP), a New Radio (NR) BS, a 5G node B, and the like.

The multiple access techniques described above have been employed in various telecommunications standards to provide a common protocol that enables different UEs to communicate at the city level, country level, regional level, and/or global level. The New Radio (NR), which may be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by 3 GPP. NR is designed to better support mobile broadband internet access by using Orthogonal Frequency Division Multiplexing (OFDM) with Cyclic Prefix (CP) on the downlink (CP-OFDM), CP-OFDM and/or single carrier frequency division multiplexing (SC-FDM) on the uplink (also known as discrete fourier transform spread OFDM (DFT-s-OFDM)), and supporting beamforming, multiple Input Multiple Output (MIMO) antenna technology and carrier aggregation, to improve spectral efficiency, reduce cost, improve service, utilize new spectrum, and better integrate with other open standards. As the demand for mobile broadband access continues to grow, further improvements to LTE, NR and other radio access technologies remain useful.

Disclosure of Invention

In some aspects, a wireless communication method performed by a first User Equipment (UE) includes: an inter-UE coordination scheme configured for a resource pool associated with the first UE is selected from the stored configuration information or the received indication. The method may further comprise: an indication of one or more of a preferred or non-preferred side uplink resource for transmission from the second UE to the first UE is sent to a second UE based at least in part on the inter-UE coordination scheme.

In some aspects, a wireless communication method performed by a first UE includes: an indication of one or more of a preferred or non-preferred side uplink resource for transmission to a second UE is received from the second UE according to an inter-UE coordination scheme configured for a resource pool associated with the first UE. The method may further comprise: sensing side uplink resources if the inter-UE coordination scheme specifies that the first UE is to perform sensing; and transmitting a communication to the second UE on a sidelink channel based at least in part on the indication of the one or more of the preferred sidelink resource or the non-preferred sidelink resource and as a result of the sensing when sensing is performed.

In some aspects, a first UE for wireless communication includes a memory and one or more processors coupled to the memory and configured to: selecting an inter-UE coordination scheme configured for a resource pool associated with the first UE from stored configuration information or received indications; and transmitting, to a second UE, an indication of one or more of a preference-side or non-preference-side uplink resource for transmission from the second UE to the first UE based at least in part on the inter-UE coordination scheme.

In some aspects, a UE for wireless communication includes a memory and one or more processors coupled to the memory and configured to: receiving, from a second UE, an indication of one or more of a preferred or non-preferred side uplink resource for transmission to the second UE according to an inter-UE coordination scheme configured for a resource pool associated with the first UE; sensing side uplink resources if the inter-UE coordination scheme specifies that the first UE is to perform sensing; and transmitting a communication to the second UE on a sidelink channel based at least in part on the indication of the one or more of the preferred sidelink resource or the non-preferred sidelink resource and as a result of the sensing when sensing is performed.

In some aspects, a non-transitory computer-readable medium storing a set of instructions comprises one or more instructions that, when executed by one or more processors of a first UE, cause the first UE to: selecting an inter-UE coordination scheme configured for a resource pool associated with the first UE from stored configuration information or received indications; and transmitting, to a second UE, an indication of one or more of a preference-side or non-preference-side uplink resource for transmission from the second UE to the first UE based at least in part on the inter-UE coordination scheme.

In some aspects, a non-transitory computer-readable medium storing a set of instructions comprises one or more instructions that, when executed by one or more processors of a first UE, cause the first UE to: receiving, from a second UE, an indication of one or more of a preferred or non-preferred side uplink resource for transmission to the second UE according to an inter-UE coordination scheme configured for a resource pool associated with the first UE; sensing side uplink resources if the inter-UE coordination scheme specifies that the first UE is to perform sensing; and transmitting a communication to the second UE on a sidelink channel based at least in part on the indication of the one or more of the preferred sidelink resource or the non-preferred sidelink resource and as a result of the sensing when sensing is performed.

In some aspects, an apparatus comprises: means for selecting an inter-UE coordination scheme configured for a resource pool associated with the first UE from stored configuration information or received indications; and means for transmitting, to a second UE, an indication of one or more of a preferred or non-preferred side uplink resource for transmission from the second UE to the first UE based at least in part on the inter-UE coordination scheme.

In some aspects, an apparatus comprises: means for receiving, from another apparatus, an indication of one or more of a preferred or non-preferred side uplink resource for transmission to the other apparatus according to an inter-UE coordination scheme configured for a resource pool associated with the apparatus; means for sensing side uplink resources if the inter-UE coordination scheme specifies that the apparatus is to perform sensing; and means for sending a communication to the other apparatus on a sidelink channel based at least in part on the indication of the one or more of the preferred sidelink resource or the non-preferred sidelink resource and as a result of the sensing when sensing is performed.

Aspects generally include a method, apparatus, system, computer program product, non-transitory computer readable medium, user device, base station, network entity, wireless communication device, and/or processing system as substantially described herein with reference to and as illustrated by the accompanying drawings and description.

The foregoing has outlined rather broadly the features and technical advantages of examples in accordance with the present disclosure in order that the detailed description that follows may be better understood. Additional features and advantages will be described hereinafter. The disclosed concepts and specific examples may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The features of the concepts disclosed herein, both as to their organization and method of operation, together with the associated advantages will be better understood from the following description when considered in connection with the accompanying figures. Each of the figures is provided for purposes of illustration and description and is not intended as a definition of the limits of the claims.

While aspects are described in this disclosure by way of illustration of some examples, those skilled in the art will appreciate that: such aspects may be implemented in many different arrangements and scenarios. The techniques described herein may be implemented using different platform types, devices, systems, shapes, sizes, and/or packaging arrangements. For example, some aspects may be implemented via integrated chip embodiments or other non-module component based devices (e.g., end user devices, vehicles, communication devices, computing devices, industrial devices, retail/procurement devices, medical devices, and/or artificial intelligence devices). Aspects may be implemented in chip-level components, modular components, non-chip-level components, device-level components, and/or system-level components. Devices incorporating the described aspects and features may include additional components and features for implementing and practicing the claimed and described aspects. For example, the transmission and reception of wireless signals may include one or more components (e.g., hardware components including antennas, radio Frequency (RF) chains, power amplifiers, modulators, buffers, processors, interleavers, adders, and/or summers) for analog and digital purposes. Aspects described herein are intended to be implementable in a variety of devices, components, systems, distributed arrangements, and/or end user devices of different sizes, shapes, and configurations.

Drawings

So that the manner in which the above recited features of the present disclosure can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to aspects, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only certain typical aspects of this disclosure and are therefore not to be considered limiting of its scope, for the description may admit to other equally effective aspects. The same reference numbers in different drawings may identify the same or similar elements.

Fig. 1 is a diagram illustrating an example of a wireless network according to the present disclosure.

Fig. 2 is a diagram illustrating an example of a base station communicating with a User Equipment (UE) in a wireless network in accordance with the present disclosure.

Fig. 3 is a diagram illustrating an example of side-uplink communication according to the present disclosure.

Fig. 4 is a diagram illustrating an example of selection-side uplink resources according to the present disclosure.

Fig. 5 is a diagram illustrating an example of side-uplink resources reporting resources using a pin according to the present disclosure.

Fig. 6 is a diagram illustrating an example of indicating and using scheduled side-uplink resources according to the present disclosure.

Fig. 7 is a diagram illustrating an example of indicating and using side-uplink resources according to the present disclosure.

Fig. 8 is a diagram illustrating an example process performed, for example, by a first UE, in accordance with the present disclosure.

Fig. 9 is a diagram illustrating an example process performed, for example, by a first UE, in accordance with the present disclosure.

Fig. 10-11 are block diagrams of example apparatuses for wireless communication according to the present disclosure.

Detailed Description

Various aspects of the disclosure are described more fully hereinafter with reference to the accompanying drawings. This disclosure may, however, be embodied in many different forms and should not be construed as limited to any specific structure or function presented throughout this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. One of ordinary skill in the art will appreciate that the scope of the present disclosure is intended to encompass any aspect of the disclosure disclosed herein, whether implemented independently of or in combination with any other aspect of the disclosure. For example, an apparatus may be implemented or a method practiced using any number of the aspects set forth herein. Furthermore, the scope of the present disclosure is intended to cover such an apparatus or method that is practiced using other structure, functionality, or both in addition to or other than the aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of the claims.

Several aspects of a telecommunications system will now be presented with reference to various apparatus and techniques. These apparatus and methods will be described in the following detailed description and illustrated in the figures by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.

Although aspects may be described herein using terms commonly associated with 5G or New Radio (NR) Radio Access Technologies (RATs), aspects of the present disclosure may be applied to other RATs, such as 3G RATs, 4G RATs, and/or RATs after 5G (e.g., 6G).

Fig. 1 is a diagram illustrating an example of a wireless network 100 according to the present disclosure. The wireless network 100 may be or may include elements of a 5G (e.g., NR) network and/or a 4G (e.g., long Term Evolution (LTE)) network, etc. Wireless network 100 may include one or more base stations 110 (shown as BS110a, BS110b, BS110c, and BS110 d), user Equipment (UE) 120 or multiple UEs 120 (shown as UE 120a, UE 120b, UE 120c, UE 120d, and UE 120 e), and/or other network entities. Base station 110 is the entity in communication with UE 120. Base stations 110 (sometimes referred to as BSs) may include, for example, NR base stations, LTE base stations, nodes B, eNB (e.g., in 4G), gnbs (e.g., in 5G), access points, and/or transmit-receive points (TRPs). Each base station 110 may provide communication coverage for a particular geographic area. In the third generation partnership project (3 GPP), the term "cell" can refer to a coverage area of a base station 110 and/or a base station subsystem serving the coverage area, depending on the context in which the term is used.

The base station 110 may provide communication coverage for a macrocell, a picocell, a femtocell, and/or another type of cell. A macrocell may cover a relatively large geographic area (e.g., a few kilometers in radius) and may allow unrestricted access by UEs 120 with service subscription. The pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs 120 with service subscription. A femto cell may cover a relatively small geographic area (e.g., home) and may allow restricted access by UEs 120 having an association with the femto cell (e.g., UEs 120 in a Closed Subscriber Group (CSG)). The base station 110 for a macro cell may be referred to as a macro base station. The base station 110 for a pico cell may be referred to as a pico base station. The base station 110 for a femto cell may be referred to as a femto base station or a home base station. In the example shown in fig. 1, BS110a may be a macro base station for macro cell 102a, BS110b may be a pico base station for pico cell 102b, and BS110c may be a femto base station for femto cell 102 c. A base station may support one or more (e.g., three) cells.

In some examples, the cell may not necessarily be stationary, and the geographic area of the cell may move according to the location of the moving base station 110 (e.g., a mobile base station). In some examples, base stations 110 may be interconnected in wireless network 100 to each other and/or to one or more other base stations 110 or network nodes (not shown) through various types of backhaul interfaces, such as direct physical connections or virtual networks, using any suitable transport network.

In some aspects, the term "base station" (e.g., base station 110) or "network entity" may refer to an aggregated base station, a decomposed base station, an Integrated Access and Backhaul (IAB) node, a relay node, and/or one or more components thereof. For example, in some aspects, a "base station" or "network entity" may refer to a Central Unit (CU), a Distributed Unit (DU), a Radio Unit (RU), a near real-time (near RT) RAN Intelligent Controller (RIC), or a non-real-time (non-RT) RIC, or a combination thereof. In some aspects, the term "base station" or "network entity" may refer to a device configured to perform one or more functions, such as those described herein in connection with base station 110. In some aspects, the term "base station" or "network entity" may refer to a plurality of devices configured to perform one or more functions. For example, in some distributed systems, each of a number of different devices (which may be located in the same geographic location or different geographic locations) may be configured to perform at least a portion of a function or to repeatedly perform the at least a portion of the function, and the term "base station" or "network entity" may refer to any one or more of these different devices. In some aspects, the term "base station" or "network entity" may refer to one or more virtual base stations and/or one or more virtual base station functions. For example, in some aspects, two or more base station functions may be instantiated on a single device. In some aspects, the term "base station" or "network entity" may refer to one of the base station functions, but not another base station function. Thus, a single device may include more than one base station.

The wireless network 100 may include one or more relay stations. A relay station is an entity that receives a transmission of data from an upstream station (e.g., base station 110 or UE 120) and sends a transmission of data to a downstream station (e.g., UE 120 or base station 110). The relay station may be a UE 120 that may relay transmissions for other UEs 120. In the example shown in fig. 1, BS110d (e.g., a relay base station) may communicate with BS110a (e.g., a macro base station) and UE 120d in order to facilitate communications between BS110a and UE 120 d. The base station 110 relaying communications may also be referred to as a relay station, relay base station, relay, etc.

The wireless network 100 may be a heterogeneous network including different types of base stations 110 (such as macro base stations, pico base stations, femto base stations, relay base stations, etc.). These different types of base stations 110 may have different transmit power levels, different coverage areas, and/or different impact on interference in the wireless network 100. For example, macro base stations may have a higher transmit power level (e.g., 5 to 40 watts), while pico base stations, femto base stations, and relay base stations may have a lower transmit power level (e.g., 0.1 to 2 watts).

The network controller 130 may be coupled to a set of base stations 110 or in communication with a set of base stations 110 and may provide coordination and control for these base stations 110. The network controller 130 may 110 communicate with the base stations 110 via backhaul communication links. The base stations 110 may also communicate directly with each other or indirectly via a wireless backhaul link or a wired backhaul link.

UEs 120 may be dispersed throughout wireless network 100, and each UE120 may be stationary or mobile. UE120 may include, for example, an access terminal, a mobile station, and/or a subscriber unit. UE120 may be a cellular telephone (e.g., a smart phone), a Personal Digital Assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a Wireless Local Loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, a super-book, a medical device, a biometric device, a wearable device (e.g., a smartwatch, smart clothing, smart glasses, a smartwristband, smart jewelry (e.g., a smartring or smart bracelet)), an entertainment device (e.g., a music device, a video device, and/or a satellite radio), a vehicle component or sensor, a smart meter/sensor, an industrial manufacturing device, a global positioning system device, and/or any other suitable device configured to communicate via a wireless medium.

Some UEs 120 may be considered Machine Type Communication (MTC) or evolved or enhanced machine type communication (eMTC) UEs. MTC UEs and/or eMTC UEs may include, for example, robots, drones, remote devices, sensors, meters, monitors, and/or location tags, which may communicate with a base station, another device (e.g., a remote device), or some other entity. The wireless node may provide, for example, a connection to a network (e.g., a wide area network such as the internet or a cellular network) or a connection to a network via a wired or wireless communication link. Some UEs 120 may be considered internet of things (IoT) devices and/or may be implemented as NB-IoT (narrowband IoT) devices. Some UEs 120 may be considered customer premises equipment. UE120 may be included within a housing that houses components of UE120, such as processor components and/or memory components. In some examples, the processor component and the memory component may be coupled together. For example, a processor component (e.g., one or more processors) and a memory component (e.g., memory) may be operatively coupled, communicatively coupled, electronically coupled, and/or electrically coupled.

In general, any number of wireless networks 100 may be deployed in a given geographic area. Each wireless network 100 may support a particular RAT and may operate on one or more frequencies. A RAT may also be referred to as a radio technology, an air interface, etc. Frequencies may also be referred to as carriers, frequency channels, etc. Each frequency may support a single RAT in a given geographical area in order to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks may be deployed.

In some examples, two or more UEs 120 (e.g., shown as UE 120a and UE 120 e) may communicate directly (e.g., without using base station 110 as an intermediary to communicate with each other) using one or more side-uplink channels. For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, a vehicle-to-everything (V2X) protocol (e.g., which may include a vehicle-to-vehicle (V2V) protocol, a vehicle-to-infrastructure (V2I) protocol, or a vehicle-to-pedestrian (V2P) protocol), and/or a mesh network. In such examples, UE 120 may perform scheduling operations, resource selection operations, and/or other operations described elsewhere herein as being performed by base station 110.

Devices of wireless network 100 may communicate using electromagnetic spectrum, which may be subdivided by frequency or wavelength into various categories, bands, channels, etc. For example, devices of wireless network 100 may communicate using one or more operating frequency bands. In 5G NR, two initial operating bands have been identified as frequency range names FR1 (410 MHz-7.125 GHz) and FR2 (24.25 GHz-52.6 GHz). It should be appreciated that although a portion of FR1 is greater than 6GHz, FR1 is generally (interchangeably) referred to as the "sub-6GHz" band. With respect to FR2, similar naming problems sometimes occur, FR2, while commonly (interchangeably) referred to as the "millimeter wave" band, differs from the Extremely High Frequency (EHF) band (30 GHz-300 GHz) identified by the International Telecommunications Union (ITU) as the "millimeter wave" band.

The frequency between FR1 and FR2 is commonly referred to as the mid-band frequency. Recent 5G NR studies have identified the operating band for these mid-band frequencies as frequency range designation FR3 (7.125 GHz-24.25 GHz). The frequency bands falling within FR3 may inherit FR1 characteristics and/or FR2 characteristics and may therefore effectively extend the characteristics of FR1 and/or FR2 to mid-band frequencies. Furthermore, higher frequency bands are currently being explored to extend 5G NR operation beyond 52.6 GHz. For example, three higher operating bands have been identified as frequency range names FR4a or FR4-1 (52.6 GHz-71 GHz), FR4 (52.6 GHz-114.25 GHz) and FR5 (114.25 GHz-300 GHz). Each of these higher frequency bands falls within the EHF frequency band.

In view of the above examples, unless explicitly stated otherwise, it should be understood that the term "sub-6GHz" and the like (if used herein) may broadly represent frequencies that may be less than 6GHz, may be within FR1, or may include mid-band frequencies. Furthermore, unless specifically stated otherwise, it should be understood that if the term "millimeter wave" or the like is used herein, the term may broadly mean frequencies that may include mid-band frequencies, may be within FR2, FR4-a or FR4-1 and/or FR5, or may be within the EHF band. It is contemplated that frequencies included in these operating bands (e.g., FR1, FR2, FR3, FR4-a, FR4-1, and/or FR 5) may be modified, and that the techniques described herein are applicable to those modified frequency ranges.

In some aspects, UE 120 may include a communication manager 140. As described in more detail elsewhere herein, the communication manager 140 may select an inter-UE coordination scheme configured for a resource pool associated with the first UE from stored configuration information or received indications, and send an indication of one or more of a preferred or non-preferred side uplink resource for transmission from the second UE to the first UE to the second UE based at least in part on the inter-UE coordination scheme.

In some aspects, the communication manager 140 may receive an indication of one or more of a preferred or non-preferred side uplink resource for transmission to the second UE from the second UE according to an inter-UE coordination scheme configured for a resource pool associated with the first UE, sense the side uplink resource if the inter-UE coordination scheme specifies that the first UE is to perform sensing, and send a communication to the second UE on the side uplink channel based at least in part on the indication of one or more of the preferred or non-preferred side uplink resource and as a result of the sensing when the sensing is performed. Additionally or alternatively, communication manager 140 may perform one or more other operations described herein.

As indicated above, fig. 1 is provided as an example. Other examples may differ from the examples described with respect to fig. 1.

Fig. 2 is a diagram illustrating an example 200 of a base station 110 in a wireless network 100 in communication with a UE 120 in accordance with the present disclosure. Base station 110 may be equipped with T antennas 234a through 234T, and UE 120 may be equipped with R antennas 252a through 252R (where, typically, T.gtoreq.1, R.gtoreq.1).

At base station 110, transmit processor 220 may receive data intended for UE 120 (or a group of UEs 120) from data source 212. Transmit processor 220 may select one or more Modulation and Coding Schemes (MCSs) for UE 120 based at least in part on one or more Channel Quality Indicators (CQIs) received from UE 120. Base station 110 may process (e.g., encode and modulate) data for UE 120 based at least in part on the MCS selected for UE 120 and provide data symbols for UE 120. Transmit processor 220 may process system information (e.g., for semi-Static Resource Partitioning Information (SRPI)) and control information (e.g., CQI requests, grants, and/or upper layer signaling) and provide overhead symbols and control symbols. The transmit processor 220 may generate reference symbols and synchronization signals (e.g., primary Synchronization Signals (PSS) or Secondary Synchronization Signals (SSS)) for reference signals (e.g., cell-specific reference signals (CRSs) or demodulation reference signals (DMRSs)). A Transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, the overhead symbols, and/or the reference symbols, if applicable, and may provide a set of output symbol streams (e.g., T output symbol streams) to a corresponding group of modems 232 (e.g., T modems) illustrated as modems 232a through 232T. For example, each output symbol stream may be provided to a modulator component (shown as MOD) of modem 232. Each modem 232 may process a respective output symbol stream (e.g., for OFDM) using a respective modulator component to obtain an output sample stream. Each modem 232 may further process (e.g., convert to analog, amplify, filter, and/or upconvert) the output sample stream using a corresponding modulator component to obtain a downlink signal. Modems 232a through 232T may transmit a set of downlink signals (e.g., T downlink signals) via a corresponding set of antennas 234 (e.g., T antennas) (shown as antennas 234a through 234T).

At UE 120, a set of antennas 252 (shown as antennas 252a through 252R) may receive the downlink signals from base station 110 and/or other base stations 110 and a set of received signals (e.g., R received signals) may be provided to a set of modems 254 (e.g., R modems) (shown as modems 254a through 254R). For example, each received signal undergoes a demodulator component (shown as DEMOD) that may be provided to a modem 254. Each modem 254 may use a corresponding demodulator assembly to condition (e.g., filter, amplify, downconvert, and/or digitize) the received signal to obtain input samples. Each modem 254 may use a demodulator assembly to further process the input samples (e.g., for OFDM) to obtain received symbols. MIMO detector 256 may obtain the received symbols from modem 254, may perform MIMO detection on the received symbols, if applicable, and may provide detected symbols. Receive processor 258 may process (e.g., demodulate and decode) the detected symbols, may provide decoded data for UE 120 to a data sink 260, and may provide decoded control information and system information to a controller/processor 280. The term "controller/processor" may refer to one or more controllers, one or more processors, or a combination thereof. The channel processor may determine a Reference Signal Received Power (RSRP) parameter, a Received Signal Strength Indicator (RSSI) parameter, a Reference Signal Received Quality (RSRQ) parameter, and/or a CQI parameter, among others. In some examples, one or more components of UE 120 may be included in housing 284.

The network controller 130 may include a communication unit 294, a controller/processor 290, and a memory 292. For example, the network controller 130 may include one or more devices in a core network. The network controller 130 may communicate with the base station 110 via a communication unit 294.

The one or more antennas (e.g., antennas 234a through 234t and/or antennas 252a through 252 r) may include or be included in one or more antenna panels, one or more antenna groups, one or more sets of antenna elements, and/or one or more antenna arrays, etc. The antenna panel, antenna group, set of antenna elements, and/or antenna array may include one or more antenna elements (within a single housing or multiple housings), a set of coplanar antenna elements, a set of non-coplanar antenna elements, and/or one or more antenna elements coupled to one or more transmit and/or receive components (such as one or more components in fig. 2).

On the uplink, at UE 120, transmit processor 264 may receive and process data from data source 262 and control information from controller/processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, and/or CQI). Transmit processor 264 may generate reference symbols for one or more reference signals. The symbols from transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by modem 254 (e.g., for DFT-s-OFDM or CP-OFDM), and transmitted to base station 110. In some examples, modem 254 of UE 120 may include a modulator and a demodulator. In some examples, UE 120 includes a transceiver. The transceiver may include any combination of antenna(s) 252, modem(s) 254, MIMO detector 256, receive processor 258, transmit processor 264, and/or TX MIMO processor 266. The transceiver may be used by a processor (e.g., controller/processor 280) and memory 282 to perform aspects of any of the methods described herein (e.g., with reference to fig. 1-11).

At base station 110, uplink signals from UE 120 and/or other UEs may be received by antennas 234, processed by modems 232 (e.g., demodulator components, shown as DEMODs, of modems 232), detected by MIMO detector 236 (if applicable), and further processed by receive processor 238 to obtain decoded data and control information sent by UE 120. The receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to a controller/processor 240. The base station 110 may include a communication unit 244 and may communicate with the network controller 130 via the communication unit 244. Base station 110 may include a scheduler 246 to schedule one or more UEs 120 for downlink and/or uplink communications. In some examples, modem 232 of base station 110 may include a modulator and a demodulator. In some examples, base station 110 includes a transceiver. The transceiver may include any combination of antenna(s) 234, modem(s) 232, MIMO detector 236, receive processor 238, transmit processor 220, and/or TX MIMO processor 230. The transceiver may be used by a processor (e.g., controller/processor 240) and memory 242 to perform aspects of any of the methods described herein (e.g., with reference to fig. 1-11).

The controller/processor 240 of the base station 110, the controller/processor 280 of the UE 120, and/or any other component of fig. 2 may perform one or more techniques associated with inter-UE coordination for a resource pool, as described in more detail elsewhere. For example, controller/processor 240 of base station 110, controller/processor 280 of UE 120, and/or any other component in fig. 2 may perform or direct operations such as process 800 of fig. 8, process 900 of fig. 9, and/or other processes as described herein. Memory 242 and memory 282 may store data and program codes for base station 110 and UE 120, respectively. In some examples, memory 242 and/or memory 282 may include a non-transitory computer-readable medium storing one or more instructions (e.g., code and/or program code) for wireless communication. For example, the one or more instructions, when executed by one or more processors of base station 110 and/or UE 120 (e.g., directly, or after compilation, conversion, and/or interpretation), may cause the one or more processors, UE 120, and/or base station 110 to perform or direct operations such as process 800 of fig. 8, process 900 of fig. 9, and/or other processes as described herein. In some examples, the execution instructions may include execution instructions, conversion instructions, compilation instructions, and/or interpretation instructions, among others.

In some aspects, a first UE (e.g., UE 120) includes means for selecting an inter-UE coordination scheme configured for a resource pool associated with the first UE from stored configuration information or received indications, and/or means for sending an indication of one or more of a preferred or non-preferred side uplink resource for transmission from the second UE to the first UE to the second UE based at least in part on the inter-UE coordination scheme. The means for the first UE to perform the operations described herein may include, for example, one or more of communication manager 140, antenna 252, demodulator 254, MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, modulator 254, controller/processor 280, or memory 282.

In some aspects, a first UE (e.g., UE 120) includes means for receiving, from a second UE, an indication of one or more of a preferred or non-preferred side uplink resource for transmission to the second UE according to an inter-UE coordination scheme configured for a resource pool associated with the first UE, means for sensing the side uplink resource if the inter-UE coordination scheme specifies that the first UE is to perform sensing; and/or means for sending a communication to the second UE on the sidelink channel based at least in part on the indication of one or more of the preferred sidelink resource or the non-preferred sidelink resource and as a result of the sensing when the sensing is performed. The means for the first UE to perform the operations described herein may include, for example, one or more of communication manager 140, antenna 252, demodulator 254, MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, modulator 254, controller/processor 280, or memory 282.

Although the blocks in fig. 2 are shown as distinct components, the functionality described above for the blocks may be implemented in a single hardware, software, or combined component or in various combinations of components. For example, the functions described with respect to transmit processor 264, receive processor 258, and/or TX MIMO processor 266 may be performed by controller/processor 280 or under the control of controller/processor 280.

As indicated above, fig. 2 is provided as an example. Other examples may differ from the example described with respect to fig. 2.

Fig. 3 is a diagram illustrating an example 300 of side-link communication according to the present disclosure.

As shown in fig. 3, a first UE302 may communicate with a second UE 304 (and one or more other UEs) via one or more side uplink channels 310. The UEs 302 and 304 may communicate using one or more side uplink channels 310 for P2P communication, D2D communication, V2X communication (e.g., which may include V2V communication, V2I communication, and/or V2P communication), and/or mesh networks. In some aspects, UE302 and UE 304 may correspond to one or more other UEs. In some aspects, one or more side-link channels 310 may use a PC5 interface and/or may operate in a high frequency band (e.g., 5.9 gigahertz (GHz) band). Additionally or alternatively, the UE302 and the UE 304 may synchronize the timing of Transmission Time Intervals (TTIs) (e.g., frames, subframes, slots, or symbols) using Global Navigation Satellite System (GNSS) timing.

As further shown in fig. 3, the one or more sidelink channels 310 may include a Physical Sidelink Control Channel (PSCCH) 315, a Physical Sidelink Shared Channel (PSSCH) 320, and/or a Physical Sidelink Feedback Channel (PSFCH) 325.PSCCH 315 may be used to transmit control information similar to a Physical Downlink Control Channel (PDCCH) and/or a Physical Uplink Control Channel (PUCCH) used for cellular communications with a base station (e.g., base station 110) via an access link or access channel. The PSSCH 320 may be used to transmit data, similar to a Physical Downlink Shared Channel (PDSCH) and/or a Physical Uplink Shared Channel (PUSCH) used for cellular communications with a base station via an access link or access channel. For example, PSCCH 315 may carry side-link control information (SCI) 330, which may indicate various control information for side-link communications, such as one or more resources (e.g., time resources, frequency resources, and/or spatial resources), where Transport Blocks (TBs) 335 may be carried on PSSCH 320. TB 335 may include data. The PSFCH 325 may be used for transmit side uplink feedback 340 such as hybrid automatic repeat request (HARQ) feedback (e.g., acknowledgement or negative acknowledgement (ACK/NACK) information), transmit Power Control (TPC), and/or Scheduling Request (SR).

In some aspects, one or more side-uplink channels 310 may use a pool of resources. For example, the scheduling assignment (e.g., included in SCI 330) may be transmitted in a subchannel that uses a particular Resource Block (RB) across time. In some aspects, data transmissions associated with a scheduling assignment (e.g., on PSSCH 320) may occupy adjacent RBs in the same subframe as the scheduling assignment (e.g., using frequency division multiplexing). In some aspects, the scheduling assignment and associated data transmission are not sent on adjacent RBs.

In some aspects, the UE 304 may operate using a transmission mode in which resource selection and/or scheduling is performed by the UE 302 (e.g., rather than a base station). In some aspects, UE 302 and/or UE 304 may perform resource selection and/or scheduling by sensing channel availability for transmissions. For example, the UE 304 may measure an RSSI parameter (e.g., a side-uplink-RSSI (S-RSSI) parameter) associated with each side-link channel, may measure an RSRP parameter (e.g., a PSSCH-RSRP parameter) associated with each side-link channel, may measure an RSRQ parameter (e.g., a PSSCH-RSRQ parameter) associated with each side-link channel, and/or may determine a signal-to-interference ratio (SIR) associated with another UE on the side-link channel. The UE 304 may select a channel for transmission-side uplink communication based at least in part on the measurements.

Additionally or alternatively, UE 304 may perform resource selection and/or scheduling using SCI 330 received in PSCCH 315, SCI 330 may indicate occupied resources and/or channel parameters. Additionally or alternatively, the UE 304 may perform resource selection and/or scheduling by determining a Channel Busy Rate (CBR) associated with each side uplink channel, which may be used for rate control (e.g., by indicating a maximum number of resource blocks that the UE 304 may use for a particular set of subframes).

In a transmission mode in which resource selection and/or scheduling is performed by UE 302, UE 302 may generate a side-uplink grant and may send the grant in SCI 330. The sidelink grant may indicate, for example, one or more parameters (e.g., transmission parameters) to be used for the upcoming sidelink transmission, such as one or more resource blocks to be used for the upcoming sidelink transmission on the PSSCH 320 (e.g., for the TB 335), one or more subframes to be used for the upcoming sidelink transmission, and/or an MCS to be used for the upcoming sidelink transmission. In some aspects, UE 302 may generate a side-uplink grant indicating one or more parameters for semi-persistent scheduling (SPS), such as a period of side-uplink transmission. Additionally or alternatively, UE 302 may generate side-uplink grants for event-driven scheduling, such as for on-demand side-uplink messages.

UE 302 and UE 304 may operate in a side-link resource allocation mode 2 in which UE 302 and UE 304 schedule or reserve their own side-link resources without assistance or guidance from a base station (mode 1). In some aspects, UE 302 may indicate available sidelink resources to UE 304, and UE 304 may select sidelink resources for transmission from among the available sidelink resources. The UE 304 may also sense one or more of the sidelink channels 310 to determine which sidelink resources are available. The UE 304 may select the sidelink resources for transmission from the sidelink resources indicated as available by the UE 302 and/or from the sidelink resources sensed as available by the UE 304. In some aspects, UE 302 may schedule one or more preference-side uplink resources on behalf of UE 304. According to various aspects described herein, UE 120a may indicate available sidelink resources and/or schedule sidelink resources based at least in part on listening for availability reports broadcast from other UEs.

As indicated above, fig. 3 is provided as an example. Other examples may differ from the example described with respect to fig. 3.

Fig. 4 is a diagram illustrating an example 400 of selecting side uplink resources according to the present disclosure. The example 400 shows a UE 402 (e.g., the UE 302) that may receive communications from other UEs (e.g., the UE 304) such as the UE 404, the UE 406, and/or the UE 408 on a side-uplink channel.

As described in connection with fig. 4-7, UE 404 is a transmitting UE that is transmitting communications to UE 402 and UE 402 is a receiving UE. The UE 404 may use the resource report from the UE 402, and the UE 402 may act as a reporting UE reporting the available side-link resources. The example 400 shows resource reporting from the UE 402 to the UE 404 and communication from the UE 404 to the UE 402.

If the UE 404 is to send a communication to the UE 402, the UE 404 may sense the side-link channels in a sensing window to determine which side-link resources (e.g., subcarriers, subchannels) are available. A side-link resource may be considered available if it is idle or has signal energy (e.g., RSRP) that meets an availability threshold (e.g., measured interference or energy on a channel is below a maximum decibel-milliwatt (dBm) or dB-RSRP threshold). The availability threshold may be configured per pair of transmit priority and receive priority. The UE 404 may measure the DMRS on the PSCCH or PSSCH according to the configuration.

For example, the UE 404 may prepare to send a communication to the UE 402. UE 404 may have sensed the previous side-link resources and successfully decoded SCIs from UE 406 and UE 408. The UE 404 may attempt to reserve the sidelink resources and may therefore check the availability of future sidelink resources reserved by the UE 406 and the UE 408 by sensing the sidelink channel in the sensing window. UE 404 may measure the RSRP of the signal from UE 408 in side uplink resource 410 and the RSRP of the signal from UE 406 in side uplink resource 412. If the observed RSRP meets the RSRP threshold (e.g., is below the maximum RSRP), the corresponding side uplink resources may be available for reservation by the UE 404. The UE 404 may reserve side uplink resources (which may be randomly selected from available resources). For example, the UE 404 may select and reserve the side-link resources 412 for transmission. This may be in a time slot after which UE 406 and UE 408 have used the sidelink resources and UE 404 may have sensed these sidelink resources early.

There may be a resource selection trigger to process time T before a resource selection window from which side-link resources are available _proc,0 After and at another processing time T _proc,1 Previously, the selection of the side-link resources was triggered. The resource selection window may be a time window from which side uplink resources may be selected, and the resource selection window may be extended for a remaining data Packet Delay Budget (PDB). T shown in FIG. 4 ₀ May be a configured value such as 100 milliseconds (ms) or 1100ms. T (T) ₁ May be of a duration specific to the implementation of the UE. T (T) _2,min May be multiplied by 2 for each priority {1, 5, 10, 20} ^μ Is configured with μ=0, 1, 2, and 3 for subcarrier spacings of 15 kilohertz (kHz), 30kHz, 60kHz, and 120kHz, respectively.

If it triggersResource selection, the UE may use SCI detected during the sensing window. If another UE is reserving resources in the resource selection window, the UE may compare the measured RSRP from the other UE and compare it to the one for a pair of priorities (p _i ,p _j ) A given RSRP threshold is compared, where p _i Is the priority of the data packet for which the UE is reserving resources, and p _j Is the priority of the data packet of the other UE. If the measured RSRP is below the threshold, resources are available.

The UE 404 may be power sensitive and thus may not be able to continuously sense all of the side-link resources. UE 402 may be more capable of sensing and reporting side-link resources because UE 402 may be a smart phone and UE 404 may be a smart watch. UE 402 may receive unicast communications from UE 404 and UE 402 may report back to UE 404 the available resources. The UE 402 may continuously sense the side-link resources and measure the interference level related to the neighboring UEs. For example, the UE 402 may measure RSRP of signals from the neighboring UE 406 as-92 dBm and RSRP of signals from the neighboring UE 408 as-102 dBm. For the last transmitted signal of the UE 404, the UE 402 may measure the RSRP to a target signal level of-90 dBm. UE 402 may estimate the SIR of the signal between UE 402 and UE 404 as-90- (-92) =2 dB, and the SIR between UE 404 and UE 408 as-90- (-102) =12 dB. If the SIR of the signal from UE 404 to UE 402 is large enough (meeting the availability threshold) under interference from UE 408 for reliable communication between UE 402 and UE 404, UE 402 may mark the side-uplink resources reserved by UE 408 as available for communication from UE 404 to UE 402. This may be useful when the UE 404 has more than one data stream with varying quality of service (QoS) requirements or transmissions with different MCS indexes.

As indicated above, fig. 4 is provided as an example. Other examples may differ from the example described with respect to fig. 4.

Fig. 5 is a diagram illustrating an example 500 of using resource reports for side-uplink resources in accordance with the present disclosure. Example 500 shows that UE 402 can send a report to UE 404.

The UE 402 may send a report 502, the report 502 indicating the availability of each side uplink resource. The rows in report 502 may represent subcarriers or subchannels and the columns may represent time cells (e.g., slots, symbols). Report 502 may be a binary report, such as a bitmap. For example, the UE 402 may report 1 bit for available and 0 bit for unavailable. The UE 404 may decode the report 502 and select N resources (e.g., randomly) from among the available side-uplink resources for potential N transmissions of the newly generated data packet or the previously unsent data packet of the transport block. As shown by selection 504, UE 404 may select n=4 side-link resources from among the available side-link resources indicated by report 502. In some aspects, report 502 may indicate side uplink resources with a collision. Such side-link resources would not be preferred.

As indicated above, fig. 5 is provided as an example. Other examples may differ from the example described with respect to fig. 5.

Fig. 6 is a diagram illustrating an example 600 of indicating and using scheduled side-uplink resources according to the present disclosure.

UE 402 may prefer that UE 404 use side-link resources with a lower expected interference level than other side-link resources. If so, in accordance with aspects described herein, the UE 402 may schedule one or more sidelink resources on behalf of the UE 404 when indicating available sidelink resources to the UE 404. The UE 402 may still allow the UE 404 to select other side-link resources from the remaining available side-link resources. By scheduling the available, preferred side-link resources for the UE 404, the UE 402 may allow the UE 404 to conserve power, processing resources, and signaling resources because the UE 404 performs less sensing and scheduling of side-link resources. The UE 404 may still have flexibility to sense the side uplink channel and select the side uplink resources to avoid interference or collisions that degrade communications, which saves power, processing resources, and signaling resources that would otherwise be wasted on failed transmissions and retransmissions.

For example, the UE 404 may be configured to make a maximum of N transmissions for a data packet or for a transport block. The UE 402 may sense the channel and select a set of candidate side uplink resources in a resource selection window of the UE 404 for N transmissions. Within the set of candidate sidelink resources, the UE 402 may select and schedule M scheduled sidelink resources, where M may be 0 or up to N (0+.m+.n) candidate sidelink resources among the candidate sidelink resources of the UE 404. The example 600 shows a report 602 from the UE 402, the report 602 indicating a candidate set of side uplink resources (resources marked with a "1"). Report 602 also indicates: the UE 402 is based at least in part on sensing the sidelink channel and detecting lower interference for the scheduled sidelink resources (resources marked with an "S") that have been scheduled for the UE 404.

In some aspects, if M is less than N, the UE 404 may select other sidelink resources for any remaining transmission up to N (N-M sidelink resources for N-M transmissions) from the candidate sidelink resource set. As shown by selection 604, the UE 404 may select a scheduled sidelink resource 606 for a first transmission and select another candidate sidelink resource 608 for a second transmission. If m=0, the report 602 may be similar to a report sent periodically.

In some aspects, the UE 404 may sense the channel and may not use the scheduled candidate sidelink resources indicated in the report 602 based at least in part on sensing the sidelink channel and measuring interference from the location of the UE 404. Instead, the UE 404 may select another candidate side-link resource indicated as available in the report 602.

In some aspects, if m=n, the UE 402 may indicate the N scheduled side uplink resources by listing respective indexes of the N scheduled side uplink resources in a corresponding resource selection window of the UE 404. In addition to the index of the N scheduled side-link resources, the UE 402 may also transmit availability and/or collision information. The additional availability and/or collision information may include an indication of available candidate sidelink resources, which gives the UE 404 flexibility to alter some of the choices from any scheduled sidelink resources indicated by the UE 402. For example, if the UE 404 senses the sidelink channel partially or fully, the UE 404 may combine its own sensing results with additional availability information from the UE 402 to better understand the availability of the sidelink channel.

The UE 404 may use the report 602 for initial transmission of the transport block. For example, as shown in fig. 6, the UE 404 may have received an indication of m=1 scheduled side uplink resources for the initial transmission of a transport block in the report 602 and received the candidate set of side uplink resources in the form of a resource availability list or bit map. The UE 404 may then make its initial transmission on the scheduled side-link resources and may be free to choose from among the remaining candidate side-link resources indicated as being available in the report 602 from the UE 402 in order to make the remaining N-1 retransmissions when needed.

The candidate sidelink resources and the scheduled sidelink resources may be considered to be preferred sidelink resources. The sidelink resources that may cause anticipated or potential resource conflicts may be considered non-preferential sidelink resources. These resource conflicts may include past and/or future resource conflicts that may occur in the time domain or in the time-frequency domain. In some aspects, there may be various inter-UE coordination schemes that the UE 402 and the UE 404 may use to indicate the type of inter-UE coordination message (e.g., indication of preferred side uplink resources, indication of non-preferred side uplink resources) or to otherwise indicate resource conflicts. For example, for the first scheme, UE 402 may indicate to UE 404 that the side-link resources are preferred, and UE 404 may not sense the side-link resources. For the first scheme, the UE 402 may efficiently schedule transmissions for the UE 404, and if the UE 404 is power sensitive, such a scheme may be used. The transmissions of the UE 404 may affect multicast communications that are ongoing around the UE 404 and that are not visible to the UE 402 when the UE 402 is selecting resources. For the second scheme, UE 402 may indicate to UE 404 that the side-link resources are preferred, and UE 404 may sense the side-link resources. The multicast communication may be less affected with the second scheme than with the first scheme. For the third scheme, UE 402 may indicate non-preferred side uplink resources to UE 404, and UE 404 may not sense side uplink resources. For the fourth scheme, UE 402 may indicate non-preferred side uplink resources to UE 404 and UE 404 may sense the side uplink resources. For the fifth scheme, the UE 402 may indicate non-preference side uplink resources to other UEs.

According to some aspects described herein, an inter-UE coordination scheme may be configured for the or each resource pool. For example, the network or UE 402 may configure the resource pool through stored configuration information or through an indication to support inter-UE coordination for reporting preferred resources and/or non-preferred resources. The configured inter-UE coordination scheme may include a first scheme, a second scheme, a third scheme, a fourth scheme, a fifth scheme, or any combination thereof. In some aspects, the scheme may involve an indication of past resource conflicts and/or future resource conflicts that may occur in the time domain or in the time-frequency domain. By configuring the inter-UE coordination scheme for each resource pool, the network or UE 402 may reduce collisions and/or reduce power consumption of the UE while conserving signaling resources.

Some inter-UE coordination schemes may be more useful for particular broadcast types (e.g., unicast, multicast, broadcast), or may negatively impact particular broadcast types. Some inter-UE coordination schemes may be directed to resource pools that only support specific broadcast types. In some aspects, the network and/or UE 402 may configure the UEs in the resource pool based at least in part on the type of broadcast supported by the UEs. For example, the first scheme may be supported in a resource pool that supports only unicast communications. After configuration, UE 402 may indicate information about preferred side and/or non-preferred side uplink resources, and UE 404 may sense the side uplink resources according to an inter-UE coordination scheme configured for the associated resource pool.

In some aspects, the UE 404 may request or indicate a preference for an inter-UE coordination scheme. For example, the UE 404 may request a subset of schemes (e.g., first scheme, second scheme) that the UE 404 may support. In other examples, if the UE 404 is power limited, the UE 404 may request the first scheme. The request may be dynamic or may be exchanged during the discovery phase via PC5 Radio Resource Control (RRC) signaling.

As indicated above, fig. 6 is provided as an example. Other examples may differ from the example described with respect to fig. 6.

Fig. 7 is a diagram illustrating an example 700 of indicating and using side-uplink resources according to the present disclosure. The example 700 shows that the UE 402 and the UE 404 may communicate with each other via one or more side-link communications. In some aspects, UE 402 and/or UE 404 may communicate (e.g., send uplink transmissions and/or receive downlink transmissions) with a base station. The UE 402, the UE 404, and any base stations may be part of a wireless network (e.g., wireless network 100). As described with respect to fig. 4-6, UE 404 is a reporting UE and UE 402 is a UE transmitting communications.

As indicated by reference numeral 705, the UE 402 and the UE 404 may be configured for an inter-UE coordination scheme as part of being associated with a resource pool. In some aspects, the UE 404 may send an indication of a preference for an inter-UE coordination scheme. The inter-UE coordination scheme may be specific to the type of broadcast supported by the UEs in the resource pool. In some aspects, the UE 402 and/or the UE 404 may be configured to use an inter-UE coordination scheme by receiving an indication from a network (e.g., a gNB). The indication may be received dynamically (e.g., via Downlink Control Information (DCI)) or semi-statically (e.g., via RRC).

The UEs associated with the resource pool may be configured with a variety of inter-UE coordination schemes. If multiple schemes are supported in the resource pool, the inter-UE coordination scheme may be distinguished. For example, UE 402 and UE 404 may use orthogonal resources to transmit inter-UE coordination messages associated with different schemes. For different schemes, the UE 402 and the UE 404 may use different Physical (PHY) channels (e.g., PSSCH versus PSFCH) or different containers (e.g., SCI1, SCI2, medium access control element (MAC-CE), or PC 5-RRC) to distinguish schemes without explicit distinguisher. The UE 402 may use some dedicated resources to transmit PSSCH communications indicating preferred resources and a separate set of dedicated resources to transmit PSSCH communications indicating non-preferred resources. The UE 402 may use bits in SCI1 or SCI2 to indicate the inter-UE coordination scheme. The UE 402 may indicate the inter-UE coordination scheme via MAC-CE, a different SCI2 format, and/or a Cyclic Redundancy Check (CRC) that scrambles the SCI2 or PSSCH communication.

In some aspects, the UE 402 may configure the UE 402, the UE 404, and other UEs in the resource pool with an inter-UE coordination scheme based at least in part on the congestion level of traffic in the resource pool. For example, if the CBR for the resource pool meets a congestion threshold (e.g., a maximum CBR), the UE 402 may select a first scheme; if the CBR does not meet the congestion threshold, the UE 402 may select the second scheme.

In some aspects, the UE 402 may configure the UE 402, the UE 404, and other UEs in the resource pool for the inter-UE coordination scheme based at least in part on whether periodic reservations are enabled for the resource pool. For example, the UE 404 may have the same side uplink resources reserved periodically (e.g., every 10 th slot) as part of the periodic reservation for the resource pool, and the UE 402 may configure the UE 402 and the UE 404 to use the first scheme and/or the second scheme only if such periodic reservation is enabled.

In some aspects, the UE 402 may configure the UE 402, the UE 404, and other UEs in the resource pool for the inter-UE coordination scheme based at least in part on whether feedback is enabled. In some aspects, the inter-UE coordination scheme may be selected based at least in part on a feedback type (e.g., acknowledgement (ACK)/Negative Acknowledgement (NACK) based feedback, NACK based feedback only, ACK based feedback only).

As shown by reference numeral 710, the UE 402 may sense the sidelink channel and determine which sidelink resources are preferred (e.g., candidate sidelink resources, scheduled sidelink resources) and/or which sidelink resources are non-preferred (e.g., sidelink resource collisions, sidelink resources with negative feedback). UE 402 may sense the side-link channel in a sensing window for UE 404.

As indicated by reference numeral 715, the UE 402 may send an indication of preferred side-link resources and/or non-preferred side-link resources via RRC messages, MAC-CEs, and/or side-link control information (DCI) based at least in part on the inter-UE coordination scheme. The indication from the UE 402 may be in a unicast transmission to the UE 404 or a multicast or broadcast transmission to a neighboring UE, depending on the supportable type of broadcast for the resource pool.

As indicated by reference numeral 720, the UE 404 may sense the sidelink channel for scheduled sidelink resources indicated by the UE 402, other candidate sidelink resources indicated by the UE 402, and/or any available sidelink resources indicated by other UEs (such as the UE 406 or the UE 408 shown in fig. 4) if multicast is supported for the resource pool based at least in part on the inter-UE coordination scheme.

As shown by reference numeral 725, the UE 404 may select a sidelink resource from among the available sidelink resources indicated by the UE 402. The UE 404 may use the scheduled side-link resources indicated by the UE 402. For any remaining transmissions, the UE 404 may select other candidate side-link resources indicated by the UE 402. UE 404 may consider any reserved or available side-link resources indicated by other UEs, such as UE 406 or UE 408. As indicated by reference numeral 730, the UE 404 may transmit communications to the UE 402 on the selected side uplink resources. The UE 404 may send other communications to the UE 402 using other selected side-link resources.

As indicated above, fig. 7 is provided as an example. Other examples may differ from the example described with respect to fig. 7.

Fig. 8 is a diagram illustrating an example process 800 performed, for example, by a first UE, in accordance with the present disclosure. The example process 800 is an example in which a UE (e.g., the UE 120, the UE 402) performs operations associated with inter-UE coordination for a resource pool.

As shown in fig. 8, in some aspects, process 800 may include: an inter-UE coordination scheme configured for a resource pool associated with the first UE is selected from the stored configuration information or the received indication (block 810). For example, the UE (e.g., using the communication manager 140 and/or selection component 1008 depicted in fig. 10) may select an inter-UE coordination scheme configured for a resource pool associated with the first UE from stored configuration information or received indications, as described above.

As further shown in fig. 8, in some aspects, process 800 may include: based at least in part on the inter-UE coordination scheme, an indication of one or more of a preferred side uplink resource or a non-preferred side uplink resource for transmission from the second UE to the first UE is sent to the second UE (block 820). For example, the UE (e.g., using the communication manager 140 and/or the sending component 1004 depicted in fig. 10) may send an indication of one or more of the preferred or non-preferred side uplink resources for transmission from the second UE to the first UE to the second UE based at least in part on the inter-UE coordination scheme, as described above.

Process 800 may include additional aspects, such as any single aspect or any combination of aspects described below and/or in connection with one or more other processes described elsewhere herein.

In a first aspect, the inter-UE coordination scheme is one of the following: a first scheme in which a first UE indicates a preference-side uplink resource to a second UE, wherein the second UE does not sense the side uplink resource; a second scheme in which the first UE indicates a preference-side uplink resource to the second UE, wherein the second UE senses the side uplink resource; a third aspect, in which the first UE indicates non-preference side uplink resources to the second UE, wherein the second UE does not sense the side uplink resources; a fourth aspect, in which the first UE indicates non-preference side uplink resources to the second UE, wherein the second UE senses the side uplink resources; and a fifth scheme in which the first UE indicates non-preference side uplink resources to other UEs.

In a second aspect, alone or in combination with the first aspect, the selecting includes selecting the inter-UE coordination scheme based at least in part on whether the resource pool supports unicast, multicast, or broadcast.

In a third aspect, alone or in combination with one or more of the first and second aspects, the received indication comprises an inter-UE coordination scheme preferred by the second UE.

In a fourth aspect, alone or in combination with one or more of the first to third aspects, the selecting comprises selecting the inter-UE coordination scheme based at least in part on a congestion level in the resource pool.

In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, the selecting comprises selecting the inter-UE coordination scheme based at least in part on whether periodic reservations are enabled for the resource pool.

In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the selecting includes selecting the inter-UE coordination scheme based at least in part on whether feedback is enabled for the resource pool.

In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the selecting includes selecting an inter-UE coordination scheme based at least in part on the feedback type.

In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, the indication of one or more of the preferred or non-preferred side uplink resources indicates one or more of a type of inter-UE coordination message or a resource conflict.

In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, the inter-UE coordination scheme is one of a first inter-UE coordination scheme and a second inter-UE coordination scheme configured for a resource pool, and the transmitting comprises: an indication of either preferred or non-preferred side uplink resources is sent according to a first inter-UE coordination scheme on a first set of resources and an indication of either preferred or non-preferred side uplink resources is sent according to a second inter-UE coordination scheme on a second set of resources.

In a tenth aspect, alone or in combination with one or more of the first through ninth aspects, the process 800 includes indicating to a second UE in the SCI an inter-UE coordination scheme selected for the resource pool.

In an eleventh aspect, alone or in combination with one or more of the first through tenth aspects, the process 800 includes indicating to a second UE in the MAC-CE an inter-UE coordination scheme selected for the resource pool.

In a twelfth aspect, alone or in combination with one or more of the first through eleventh aspects, the process 800 includes indicating to the second UE an inter-UE coordination scheme selected for the resource pool via SCI format.

In a thirteenth aspect, alone or in combination with one or more of the first through twelfth aspects, the process 800 includes indicating to the second UE an inter-UE coordination scheme selected for the resource pool by how to scramble the CRC for the information, which physical channel to use, and/or which container to use.

While fig. 8 shows example blocks of the process 800, in some aspects, the process 800 may include additional blocks, fewer blocks, different blocks, or arrange different blocks than those depicted in fig. 8. Additionally or alternatively, two or more blocks of process 800 may be performed in parallel.

Fig. 9 is a diagram illustrating an example process 900 performed, for example, by a first UE, in accordance with the present disclosure. The example process 900 is an example in which a first UE (e.g., the UE 120, the UE 404) performs operations associated with inter-UE coordination for a resource pool. Note that the first UE in fig. 9 may be the second UE described with respect to fig. 8. That is, fig. 9 is a change in viewing angle from fig. 8.

As shown in fig. 9, in some aspects, process 900 may include: an indication of one or more of a preferred or non-preferred side uplink resource for transmission to a second UE is received from the second UE according to an inter-UE coordination scheme configured for a resource pool associated with the first UE (block 910). For example, the UE (e.g., using the communication manager 140 and/or the receiving component 1102 depicted in fig. 11) may receive an indication of one or more of the preferred or non-preferred side uplink resources for transmission to the second UE from the second UE according to an inter-UE coordination scheme configured for a resource pool associated with the first UE, as described above.

As shown in fig. 9, in some aspects, process 900 may include: if the inter-UE coordination scheme specifies that the first UE is to perform sensing, then side uplink resources are sensed (block 920). For example, the UE (e.g., using the communication manager 140 and/or the receiving component 1102 depicted in fig. 11) may sense the side-link resources if the inter-UE coordination scheme specifies that the first UE is to perform sensing, as described above.

As further shown in fig. 9, in some aspects, process 900 may include: based at least in part on the indication of one or more of the preferred or non-preferred side-link resources and as a result of the sensing when the sensing is performed, a communication is sent to the second UE on the side-link channel (block 930). For example, the UE (e.g., using the communication manager 140 and/or the sending component 1104 depicted in fig. 11) may send the communication to the second UE on the side-link channel based at least in part on the indication of one or more of the preferred side-link resources or the non-preferred side-link resources and as a result of the sensing when the sensing is performed, as described above.

Process 900 may include additional aspects, such as any single aspect or any combination of aspects described below and/or in connection with one or more other processes described elsewhere herein.

In a first aspect, the inter-UE coordination scheme is one of the following: a first scheme for a second UE to indicate to a first UE that the side uplink resources are preferred, wherein the second UE does not sense the side uplink resources; a second scheme for a second UE to indicate to the first UE that the side uplink resources are preferred, wherein the second UE senses the side uplink resources; a third scheme for the second UE to indicate non-preferential side uplink resources to the first UE, wherein the second UE does not sense side uplink resources; a fourth scheme for a second UE to indicate non-preferential side uplink resources to the first UE, wherein the second UE senses the side uplink resources; and a fifth scheme in which the first UE indicates non-preference side uplink resources to other UEs.

In a second aspect, alone or in combination with the first aspect, the process 900 includes sending a preference inter-UE coordination scheme to the second UE.

In a third aspect, alone or in combination with one or more of the first and second aspects, the indication of one or more of the preferred or non-preferred side uplink resources indicates one or more of a type of coordination message or a resource conflict between UEs.

In a fourth aspect, alone or in combination with one or more aspects of the first to third aspects, the inter-UE coordination scheme is one of a first inter-UE coordination scheme and a second inter-UE coordination scheme configured for a resource pool, and the receiving comprises: the method includes receiving, on a first set of resources, either preference-side uplink resources or non-preference-side uplink resources according to a first inter-UE coordination scheme, and receiving, on a second set of resources, either preference-side uplink resources or non-preference-side uplink resources according to a second inter-UE coordination scheme.

In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, the process 900 includes receiving an indication of an inter-UE coordination scheme selected for a resource pool in side uplink control information.

In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the process 900 includes receiving, in a MAC-CE, an indication of an inter-UE coordination scheme selected for a resource pool.

In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the process 900 includes determining an inter-UE coordination scheme selected for the resource pool based at least in part on the SCI format.

In an eighth aspect, alone or in combination with one or more of the first through seventh aspects, the process 900 includes determining an inter-UE coordination scheme selected for the resource pool based at least in part on how to scramble the CRC for the message, which physical channel to use, and/or which container to use.

While fig. 9 shows example blocks of process 900, in some aspects process 900 may include additional blocks, fewer blocks, different blocks, or arrange different blocks than those depicted in fig. 9. Additionally or alternatively, two or more blocks of process 900 may be performed in parallel.

Fig. 10 is a block diagram of an example apparatus 1000 for wireless communication. The apparatus 1000 may be a first UE (e.g., UE 120, UE 402), or the first UE may include the apparatus 1000. In some aspects, the apparatus 1000 includes a receiving component 1002 and a transmitting component 1004, the receiving component 1002 and the transmitting component 1004 can communicate with each other (e.g., via one or more buses and/or one or more other components). As shown, apparatus 1000 may communicate with another apparatus 1006, such as a UE, a base station, or another wireless communication device, using a receiving component 1002 and a transmitting component 1004. As further shown, the apparatus 1000 may include a communication manager 140. The communications manager 140 may include a selection component 1008 and the like.

In some aspects, the apparatus 1000 may be configured to perform one or more operations described herein in connection with fig. 1-7. Additionally or alternatively, the apparatus 1000 may be configured to perform one or more processes described herein, such as process 800 of fig. 8. In some aspects, the apparatus 1000 and/or one or more components shown in fig. 10 may include one or more components of the first UE described in connection with fig. 2. Additionally or alternatively, one or more of the components shown in fig. 10 may be implemented within one or more of the components described in connection with fig. 2. Additionally or alternatively, one or more components of the set of components may be implemented at least in part as software stored in memory. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and executable by a controller or processor to perform the functions or operations of the component.

The receiving component 1002 can receive a communication, such as a reference signal, control information, data communication, or a combination thereof, from the apparatus 1006. The receiving component 1002 can provide received communications to one or more other components of the apparatus 1000. In some aspects, the receiving component 1002 can perform signal processing (such as filtering, amplifying, demodulating, analog-to-digital converting, demultiplexing, deinterleaving, demapping, equalizing, interference cancellation or decoding, etc.) on the received communication and can provide the processed signal to one or more other components of the apparatus 1000. In some aspects, the receiving component 1002 may include one or more antennas, demodulators, MIMO detectors, receive processors, controllers/processors, memory, or a combination thereof for the first UE described in connection with fig. 2.

The transmitting component 1004 can transmit a communication, such as a reference signal, control information, data communication, or a combination thereof, to the device 1006. In some aspects, one or more other components of apparatus 1000 may generate a communication and may provide the generated communication to transmission component 1004 for transmission to apparatus 1006. In some aspects, the transmitting component 1004 can perform signal processing (such as filtering, amplifying, modulating, digital-to-analog converting, multiplexing, interleaving, mapping, encoding, or the like) on the generated communication and can transmit the processed signal to the device 1006. In some aspects, the transmit component 1004 can include one or more antennas, modulators, transmit MIMO processors, transmit processors, controllers/processors, memory, or a combination thereof of the first UE described in connection with fig. 2. In some aspects, the transmitting component 1004 can be co-located with the receiving component 1002 in a transceiver.

The selection component 1008 can select an inter-UE coordination scheme configured for a resource pool associated with the first UE from stored configuration information or received indications. The sending component 1004 can send an indication of one or more of a preferred or non-preferred side uplink resource for transmission from the second UE to the first UE to the second UE based at least in part on the inter-UE coordination scheme.

The sending component 1004 can indicate to the second UE in the SCI an inter-UE coordination scheme selected for the resource pool. The sending component 1004 may indicate to the second UE in the MAC-CE the inter-UE coordination scheme selected for the resource pool. The sending component 1004 can indicate to the second UE the inter-UE coordination scheme selected for the resource pool via SCI format. The sending component 1004 can indicate to the second UE the inter-UE coordination scheme selected for the resource pool by how to scramble the CRC for the message, which physical channel to use, and/or which container to use.

The number and arrangement of components shown in fig. 10 are provided as examples. In practice, there may be additional components, fewer components, different components, or different components arranged than those shown in fig. 10. Further, two or more components shown in fig. 10 may be implemented within a single component, or a single component shown in fig. 10 may be implemented as multiple distributed components. Additionally or alternatively, one set (one or more) of components shown in fig. 10 may perform one or more functions described as being performed by another set of components shown in fig. 10.

Fig. 11 is a block diagram of an example apparatus 1100 for wireless communications. The apparatus 1100 may be a first UE (e.g., UE 120, UE 404), or the first UE may include the apparatus 1100. In some aspects, apparatus 1100 includes a receiving component 1102 and a transmitting component 1104, the receiving component 1102 and the transmitting component 1104 can communicate with each other (e.g., via one or more buses and/or one or more other components). As shown, apparatus 1100 may communicate with another apparatus 1106, such as a UE, a base station, or another wireless communication device, using a receiving component 1102 and a transmitting component 1104. As further shown, apparatus 1100 may include a communications manager 140. The communications manager 140 may include a determination component 1108 or the like.

In some aspects, the apparatus 1100 may be configured to perform one or more operations described herein in connection with fig. 1-7. Additionally or alternatively, the apparatus 1100 may be configured to perform one or more processes described herein, such as process 900 of fig. 9. In some aspects, the apparatus 1100 and/or one or more components shown in fig. 11 may include one or more components of the first UE described in connection with fig. 2. Additionally or alternatively, one or more of the components shown in fig. 11 may be implemented within one or more of the components described in connection with fig. 2. Additionally or alternatively, one or more components of the set of components may be implemented at least in part as software stored in memory. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and executable by a controller or processor to perform the functions or operations of the component.

The receiving component 1102 can receive a communication, such as a reference signal, control information, data communication, or a combination thereof, from the device 1106. The receiving component 1102 can provide received communications to one or more other components of the apparatus 1100. In some aspects, the receiving component 1102 can perform signal processing (such as filtering, amplifying, demodulating, analog-to-digital converting, demultiplexing, deinterleaving, demapping, equalizing, interference cancellation or decoding, etc.) on the received communication and can provide the processed signal to one or more other components of the apparatus 1106. In some aspects, the receiving component 1102 may include one or more antennas, demodulators, MIMO detectors, receive processors, controllers/processors, memory, or a combination thereof for the first UE described in connection with fig. 2.

The transmission component 1104 can transmit a communication, such as a reference signal, control information, data communication, or a combination thereof, to the device 1106. In some aspects, one or more other components of apparatus 1100 may generate a communication and may provide the generated communication to transmission component 1104 for transmission to apparatus 1106. In some aspects, the transmission component 1104 can perform signal processing (such as filtering, amplifying, modulating, digital-to-analog converting, multiplexing, interleaving, mapping, encoding, or the like) on the generated communication and can transmit the processed signal to the device 1106. In some aspects, the transmit component 1104 may include one or more antennas, modulators, transmit MIMO processors, transmit processors, controllers/processors, memory, or a combination thereof of the first UE described in connection with fig. 2. In some aspects, the sending component 1104 may be co-located with the receiving component 1102 in a transceiver.

The receiving component 1102 may receive an indication of one or more of a preferred or non-preferred side uplink resource for transmission to a second UE from the second UE according to an inter-UE coordination scheme configured for a resource pool associated with the first UE. The receiving component 1102 may sense the side uplink resources if the inter-UE coordination scheme specifies that the first UE is to perform sensing. The sending component 1104 can send a communication to the second UE on the sidelink channel based at least in part on the indication of one or more of the preferred sidelink resources or the non-preferred sidelink resources and as a result of the sensing when the sensing is performed.

The sending component 1104 may send the second UE a preference inter-UE coordination scheme. The receiving component 1102 can receive an indication of an inter-UE coordination scheme selected for a resource pool in a SCI. The receiving component 1102 may receive an indication of an inter-UE coordination scheme selected for a resource pool in a MAC-CE.

The determining component 1108 can determine an inter-UE coordination scheme selected for the resource pool based at least in part on the format of the SCI.

The determining component 1108 can determine an inter-UE coordination scheme selected for the resource pool based at least in part on how to scramble the CRC for the information, which physical channel to use, and/or which container to use.

The number and arrangement of components shown in fig. 11 are provided as examples. In practice, there may be additional components, fewer components, different components, or different components arranged than those shown in fig. 11. Further, two or more components shown in fig. 11 may be implemented within a single component, or a single component shown in fig. 11 may be implemented as multiple distributed components. Additionally or alternatively, one set (one or more) of components shown in fig. 11 may perform one or more functions described as being performed by another set of components shown in fig. 11.

The following provides an overview of some aspects of the disclosure:

aspect 1: a method of wireless communication performed by a first User Equipment (UE), comprising: selecting an inter-UE coordination scheme configured for a resource pool associated with the first UE from stored configuration information or received indications; and transmitting, to a second UE, an indication of one or more of a preference-side or non-preference-side uplink resource for transmission from the second UE to the first UE based at least in part on the inter-UE coordination scheme.

Aspect 2: the method of aspect 1, wherein the inter-UE coordination scheme is one of the following: a first scheme in which the first UE indicates a preference-side uplink resource to the second UE, wherein the second UE does not sense the side uplink resource; a second scheme in which the first UE indicates a preference-side uplink resource to the second UE, wherein the second UE senses the side uplink resource; a third aspect in which the first UE indicates non-preference side uplink resources to the second UE, wherein the second UE does not sense side uplink resources; a fourth aspect in which the first UE indicates non-preference side uplink resources to the second UE, wherein the second UE senses side uplink resources; and a fifth scheme in which the first UE indicates non-preference side uplink resources to other UEs.

Aspect 3: the method of aspect 1 or 2, wherein the selecting comprises selecting the inter-UE coordination scheme based at least in part on whether the resource pool supports unicast, multicast, or broadcast.

Aspect 4: the method of any of aspects 1-3, wherein the received indication comprises an inter-UE coordination scheme preferred by the second UE.

Aspect 5: the method of any one of aspects 1-4, wherein the selecting comprises selecting the inter-UE coordination scheme based at least in part on a congestion level in the resource pool.

Aspect 6: the method of any of aspects 1-5, wherein the selecting comprises selecting the inter-UE coordination scheme based at least in part on whether periodic reservations are enabled for the resource pool.

Aspect 7: the method of any of aspects 1-6, wherein the selecting comprises selecting the inter-UE coordination scheme based at least in part on whether feedback is enabled for the resource pool.

Aspect 8: the method of any one of aspects 1-7, wherein the selecting comprises selecting the inter-UE coordination scheme based at least in part on a feedback type.

Aspect 9: the method of any one of aspects 1-8, wherein the indication of the one or more of a preferred side uplink resource or a non-preferred side uplink resource indicates one or more of a type of inter-UE coordination message or a resource conflict.

Aspect 10: the method of any one of aspects 1-9, wherein the inter-UE coordination scheme is one of a first inter-UE coordination scheme and a second inter-UE coordination scheme configured for the resource pool, and wherein the transmitting comprises: transmitting an indication of either preferred or non-preferred side uplink resources according to the first inter-UE coordination scheme on a first set of resources; and sending an indication of either preferred or non-preferred side uplink resources according to the second inter-UE coordination scheme on a second set of resources.

Aspect 11: the method of any one of aspects 1-10, further comprising indicating the inter-UE coordination scheme selected for the resource pool to the second UE in side uplink control information.

Aspect 12: the method of any of aspects 1-11, further comprising indicating the inter-UE coordination scheme selected for the resource pool to the second UE in a medium access control element (MAC-CE).

Aspect 13: the method of any of aspects 1-12, further comprising indicating to the second UE the inter-UE coordination scheme selected for the resource pool by a side-uplink control information format.

Aspect 14: the method of any one of aspects 1-13, further comprising: the inter-UE coordination scheme selected for the resource pool is indicated to the second UE by one or more of how to scramble a cyclic redundancy check for messages, which physical channel to use, or which container to use.

Aspect 15: a method of wireless communication performed by a first User Equipment (UE), comprising: receiving, from a second UE, an indication of one or more of a preferred or non-preferred side uplink resource for transmission to the second UE according to an inter-UE coordination scheme configured for a resource pool associated with the first UE; sensing side uplink resources if the inter-UE coordination scheme specifies that the first UE is to perform sensing; and transmitting a communication to the second UE on a sidelink channel based at least in part on the indication of the one or more of the preferred sidelink resource or the non-preferred sidelink resource and as a result of the sensing when sensing is performed.

Aspect 16: the method of aspect 15, wherein the inter-UE coordination scheme is one of the following: a first scheme for the second UE to indicate to the first UE that side-link resources are preferred, wherein the second UE does not sense side-link resources; a second scheme for the second UE to indicate to the first UE that a side-link resource is preferred, wherein the second UE senses a side-link resource; a third scheme for the second UE to indicate non-preferential side uplink resources to the first UE, wherein the second UE does not sense side uplink resources; a fourth scheme for the second UE to indicate non-preferential side uplink resources to the first UE, wherein the second UE senses side uplink resources; and a fifth scheme in which the first UE indicates non-preference side uplink resources to other UEs.

Aspect 17: the method of aspect 15 or 16, further comprising sending a preference inter-UE coordination scheme to the second UE.

Aspect 18: the method of any one of aspects 15-17, wherein the indication of the one or more of a preferred side uplink resource or a non-preferred side uplink resource indicates one or more of a type of inter-UE coordination message or a resource conflict.

Aspect 19: the method of any one of aspects 15-18, wherein the inter-UE coordination scheme is one of a first inter-UE coordination scheme and a second inter-UE coordination scheme configured for the resource pool, and wherein the receiving comprises: receiving, on a first set of resources, either preference-side or non-preference-side uplink resources according to the first inter-UE coordination scheme; and receiving, on a second set of resources, either preference-side or non-preference-side uplink resources according to the second inter-UE coordination scheme.

Aspect 20: the method of any one of aspects 15-19, further comprising receiving an indication of the inter-UE coordination scheme selected for the resource pool in side uplink control information.

Aspect 21: the method of any one of aspects 15-20, further comprising receiving an indication of the inter-UE coordination scheme selected for the resource pool in a medium access control element (MAC-CE).

Aspect 22: the method of any one of aspects 15-21, further comprising determining the inter-UE coordination scheme selected for the resource pool based at least in part on a format of side-uplink control information.

Aspect 23: the method of any of aspects 15-22, further comprising determining the inter-UE coordination scheme selected for the resource pool based at least in part on how to scramble a cyclic redundancy check for messages, which physical channel to use, and/or which container to use.

Aspect 24: an apparatus for wireless communication at a device, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method of one or more of aspects 1-23.

Aspect 25: an apparatus for wireless communication, comprising a memory and one or more processors coupled to the memory, the one or more processors configured to perform the method according to one or more of aspects 1-23.

Aspect 26: an apparatus for wireless communication, comprising at least one unit to perform the method of one or more of aspects 1-23.

Aspect 27: a non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform a method of one or more of aspects 1-23.

Aspect 28: a non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform a method of one or more of aspects 1-23.

The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit aspects to the precise form disclosed. Modifications and variations are possible in light of the above disclosure or may be acquired from practice of the aspects.

As used herein, the term "component" is intended to be broadly interpreted as hardware, and/or a combination of hardware and software. "software" should be construed broadly to mean instructions, instruction sets, code segments, program code, programs, subroutines, software modules, applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures and/or functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise. As used herein, a "processor" is implemented in hardware and/or a combination of hardware and software. It will be apparent that the systems and/or methods described herein may be implemented in various forms of hardware and/or combinations of hardware and software. The actual specialized control hardware or software code used to implement the systems and/or methods is not limiting of the aspects. Thus, the operations and behavior of the systems and/or methods were described without reference to the specific software code because it will be understood by those skilled in the art that software and hardware can be designed to implement the systems and/or methods based at least in part on the description herein.

As used herein, a "meeting a threshold" may refer to a value greater than a threshold, greater than or equal to a threshold, less than or equal to a threshold, not equal to a threshold, etc., depending on the context.

Although specific combinations of features are set forth in the claims and/or disclosed in the specification, such combinations are not intended to limit the disclosure of the various aspects. Many of these features may be combined in ways not specifically recited in the claims and/or disclosed in the specification. The disclosure of the various aspects includes each dependent claim combined with each other claim in the set of claims. As used herein, a phrase referring to "at least one item in a list of items" refers to any combination of these items (which includes a single member). As an example, at least one of "a, b, or c" is intended to encompass a, b, c, a + b, a + c, b + c, and a + b + c, as well as any combination with multiples of the same element (e.g., a+a, a+a+a, a+a+b, a+a+c a+b+b, a+c+c, b+b, b+b+b b+b+c, c+c, and c+c, or any other ordering of a, b, and c).

No element, act, or instruction used herein should be construed as critical or essential unless explicitly described as such. Furthermore, as used herein, the articles "a" and "an" are intended to include one or more items, and may be used interchangeably with "one or more". Furthermore, as used herein, the article "the" is intended to include one or more items recited in connection with the article "the" and may be used interchangeably with "one or more". Furthermore, as used herein, the terms "set" and "group" are intended to include one or more items, and may be used interchangeably with "one or more". If only one item is intended, the phrase "only one item" or similar will be used. Also, as used herein, the terms "having", and the like are intended to be open-ended terms that do not limit the elements they modify (e.g., the element having "a may also have B). Furthermore, the phrase "based on" is intended to mean "based, at least in part, on" unless explicitly stated otherwise. Furthermore, as used herein, the term "or" when used in a series is intended to be inclusive and may be used interchangeably with "and/or" unless otherwise explicitly stated (e.g., if used in conjunction with "any" or "only one of).

Claims (30)

1. A first User Equipment (UE) for wireless communication, comprising:

a memory; and

one or more processors coupled to the memory configured to:

selecting an inter-UE coordination scheme configured for a resource pool associated with the first UE from stored configuration information or received indications; and

an indication of one or more of a preferred or non-preferred side uplink resource for transmission from the second UE to the first UE is sent to a second UE based at least in part on the inter-UE coordination scheme.

2. The first UE of claim 1, wherein the inter-UE coordination scheme is one of:

a first scheme in which the first UE indicates a preference-side uplink resource to the second UE, wherein the second UE does not sense the side uplink resource;

a second scheme in which the first UE indicates a preference-side uplink resource to the second UE, wherein the second UE senses the side uplink resource;

a third aspect in which the first UE indicates non-preference side uplink resources to the second UE, wherein the second UE does not sense side uplink resources;

A fourth aspect in which the first UE indicates non-preference side uplink resources to the second UE, wherein the second UE senses side uplink resources; and

a fifth aspect in which the first UE indicates non-preference side uplink resources to other UEs.

3. The first UE of claim 1, wherein the one or more processors are configured to: the inter-UE coordination scheme is selected based at least in part on whether the resource pool supports unicast, multicast, or broadcast.

4. The first UE of claim 1, wherein the received indication comprises an inter-UE coordination scheme preferred by the second UE.

5. The first UE of claim 1, wherein the one or more processors are configured to: the inter-UE coordination scheme is selected based at least in part on a congestion level in the resource pool.

6. The first UE of claim 1, wherein the one or more processors are configured to: the inter-UE coordination scheme is selected based at least in part on whether periodic reservations are enabled for the resource pool.

7. The first UE of claim 1, wherein the one or more processors are configured to: the inter-UE coordination scheme is selected based at least in part on whether feedback is enabled for the resource pool.

8. The first UE of claim 1, wherein the one or more processors are configured to: the inter-UE coordination scheme is selected based at least in part on a feedback type.

9. The first UE of claim 1, wherein the indication of the one or more of a preferred side uplink resource or a non-preferred side uplink resource indicates one or more of a type of inter-UE coordination message or a resource conflict.

10. The first UE of claim 1, wherein the inter-UE coordination scheme is one of a first inter-UE coordination scheme and a second inter-UE coordination scheme configured for the resource pool, and wherein the one or more processors are configured to:

transmitting an indication of either preferred or non-preferred side uplink resources according to the first inter-UE coordination scheme on a first set of resources; and

an indication of either preferred or non-preferred side uplink resources is sent on a second set of resources according to the second inter-UE coordination scheme.

11. The first UE of claim 1, wherein the one or more processors are configured to: the inter-UE coordination scheme selected for the resource pool is indicated to the second UE in side uplink control information.

12. The first UE of claim 1, wherein the one or more processors are configured to: the inter-UE coordination scheme selected for the resource pool is indicated to the second UE in a medium access control element (MAC-CE).

13. The first UE of claim 1, wherein the one or more processors are configured to: the inter-UE coordination scheme selected for the resource pool is indicated to the second UE by a side-uplink control information format.

14. The first UE of claim 1, wherein the one or more processors are configured to: the inter-UE coordination scheme selected for the resource pool is indicated to the second UE by one or more of how to scramble a cyclic redundancy check for messages, which physical channel to use, or which container to use.

15. A first User Equipment (UE) for wireless communication, comprising:

a memory; and

one or more processors coupled to the memory configured to:

receiving, from a second UE, an indication of one or more of a preferred or non-preferred side uplink resource for transmission to the second UE according to an inter-UE coordination scheme configured for a resource pool associated with the first UE;

Sensing side uplink resources if the inter-UE coordination scheme specifies that the first UE is to perform sensing; and

a communication is sent to the second UE on a side-link channel based at least in part on the indication of the one or more of the preferred side-link resources or non-preferred side-link resources and as a result of the sensing when sensing is performed.

16. The first UE of claim 15, wherein the one or more processors are configured to: and sending a preference inter-UE coordination scheme to the second UE.

17. The first UE of claim 15, wherein the inter-UE coordination scheme is one of a first inter-UE coordination scheme and a second inter-UE coordination scheme configured for the resource pool, and wherein the one or more processors are configured to:

receiving, on a first set of resources, either preference-side or non-preference-side uplink resources according to the first inter-UE coordination scheme; and

the preferred or non-preferred side uplink resources are received according to the second inter-UE coordination scheme on a second set of resources.

18. The first UE of claim 15, wherein the one or more processors are configured to: an indication of the inter-UE coordination scheme selected for the resource pool is received in side uplink control information.

19. The first UE of claim 15, wherein the one or more processors are configured to: the inter-UE coordination scheme selected for the resource pool is determined based at least in part on a format of side-uplink control information.

20. The first UE of claim 15, wherein the one or more processors are configured to: the inter-UE coordination scheme selected for the resource pool is determined based at least in part on how to scramble a cyclic redundancy check for messages, which physical channel to use, and/or which container to use.

21. A method of wireless communication performed by a first User Equipment (UE), comprising:

selecting an inter-UE coordination scheme configured for a resource pool associated with the first UE from stored configuration information or received indications; and

an indication of one or more of a preferred or non-preferred side uplink resource for transmission from the second UE to the first UE is sent to a second UE based at least in part on the inter-UE coordination scheme.

22. The method of claim 21, wherein the selecting comprises selecting the inter-UE coordination scheme based at least in part on whether the resource pool supports unicast, multicast, or broadcast.

23. The method of claim 21, wherein the received indication comprises an inter-UE coordination scheme preferred by the second UE.

24. The method of claim 21, wherein the selecting comprises selecting the inter-UE coordination scheme based at least in part on whether feedback is enabled for the resource pool.

25. The method of claim 21, wherein the inter-UE coordination scheme is one of a first inter-UE coordination scheme and a second inter-UE coordination scheme configured for the resource pool, and wherein the transmitting comprises:

transmitting an indication of either preferred or non-preferred side uplink resources according to the first inter-UE coordination scheme on a first set of resources; and

an indication of either preferred or non-preferred side uplink resources is sent on a second set of resources according to the second inter-UE coordination scheme.

26. The method of claim 21, further comprising: the inter-UE coordination scheme selected for the resource pool is indicated to the second UE in side uplink control information.

27. The method of claim 21, further comprising: the inter-UE coordination scheme selected for the resource pool is indicated to the second UE by a side-uplink control information format.

28. The method of claim 21, further comprising: the inter-UE coordination scheme selected for the resource pool is indicated to the second UE by one or more of how to scramble a cyclic redundancy check for messages, which physical channel to use, or which container to use.

29. A method of wireless communication performed by a first User Equipment (UE), comprising:

receiving, from a second UE, an indication of one or more of a preferred or non-preferred side uplink resource for transmission to the second UE according to an inter-UE coordination scheme configured for a resource pool associated with the first UE;

sensing side uplink resources if the inter-UE coordination scheme specifies that the first UE is to perform sensing; and

a communication is sent to the second UE on a side-link channel based at least in part on the indication of the one or more of the preferred side-link resources or non-preferred side-link resources and as a result of the sensing when sensing is performed.

30. The method of claim 29, further comprising: and sending a preference inter-UE coordination scheme to the second UE.