WO2022032617A1

WO2022032617A1 - Interference measurements for sidelink communications

Info

Publication number: WO2022032617A1
Application number: PCT/CN2020/109098
Authority: WO
Inventors: Huilin Xu; Peng Cheng; Jing LEI
Original assignee: Qualcomm Incorporated
Priority date: 2020-08-14
Filing date: 2020-08-14
Publication date: 2022-02-17

Abstract

Methods, systems, and devices for wireless communications are described in which a victim user equipment (UE) may be configured to detect and measure cross link interference (CLI) from one or more aggressor UEs. Based on the CLI measurement (s), the victim UE may select a target UE of the aggressor UEs for subsequent sidelink communications. The CLI measurement may indicate a condition of the channel between the victim UE and the aggressor UE, and based on the CLI measurement, the victim UE may disconnect from a currently connected sidelink UE and establish a sidelink connection with the selected target UE of the aggressor UEs. By determining to connect to an aggressor UE based on a CLI measurement, a victim UE may reduce latency associated with sidelink communications.

Description

INTERFERENCE MEASUREMENTS FOR SIDELINK COMMUNICATIONS

INTRODUCTION

The following relates to wireless communications, including managing sidelink communications.

Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power) . Examples of such multiple-access systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which may be referred to as New Radio (NR) systems. These systems may employ technologies such as code division multiple access (CDMA) , time division multiple access (TDMA) , frequency division multiple access (FDMA) , orthogonal frequency division multiple access (OFDMA) , or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM) . A wireless multiple-access communications system may include one or more base stations or one or more network access nodes, each simultaneously supporting communication for multiple communication devices, which may be otherwise known as user equipment (UE) .

SUMMARY

A method of wireless communications at a UE is described. The method may include receiving a configuration indicating a set of measurement resources designated for performing interference measurements by the UE, and measuring interference from one or more candidate UEs over the set of measurement resources. The method may also include selecting a target UE from the one or more candidate UEs for a sidelink connection with the UE based on the measured interference from the one or more candidate UEs, and establishing a sidelink communications link with the target UE based on selecting the target UE.

An apparatus for wireless communications at a UE is described. The apparatus may include a processor and memory coupled to the processor. The processor and memory may be configured to receive a configuration indicating a set of measurement resources designated for performing interference measurements by the UE, and measure interference from one or more candidate UEs over the set of measurement resources. The processor and memory may be configured to select a target UE from the one or more candidate UEs for a sidelink connection with the UE based on the measured interference from the one or more candidate UEs, and establish a sidelink communications link with the target UE based on selecting the target UE.

Another apparatus for wireless communications at a UE is described. The apparatus may include means for receiving a configuration indicating a set of measurement resources designated for performing interference measurements by the UE, means for measuring interference from one or more candidate UEs over the set of measurement resources, and means for selecting a target UE from the one or more candidate UEs for a sidelink connection with the UE. In some examples, the means for selecting the target UE may be operable based on the measured interference from the one or more candidate UEs. The apparatus may include means for establishing a sidelink communications link with the target UE based on selecting the target UE.

A non-transitory computer-readable medium storing code for wireless communications at a UE is described. The code may include instructions executable by a processor to receive a configuration indicating a set of measurement resources designated for performing interference measurements by the UE, measure interference from one or more candidate UEs over the set of measurement resources, and select a target UE from the one or more candidate UEs for a sidelink connection with the UE. In some examples, selecting the target UE may be based on the measured interference from the one or more candidate UEs. The code may further include instructions executable by the processor to establish a sidelink communications link with the target UE based on selecting the target UE.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining that a measured interference associated with the target UE exceeds a threshold based on the measuring. In some examples, the target UE may be selected based on the measured interference exceeding the threshold.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for refraining from measuring interference from the one or more candidate UEs other than the target UE over a subsequent set of measurement resources based on determining that the measured interference associated with the target UE exceeds the threshold.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining that a measured interference associated with a sidelink UE connected to the UE may be below a threshold based on the measuring. Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for initiating the measuring of the interference from the one or more candidate UEs over the set of measurement resources after determining that the measured interference associated with the sidelink UE may be below the threshold.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining that a measured interference associated with the target UE exceeds an interference measurement associated with a previously measured UE by a threshold. In some examples, the target UE may be selected based on the measured interference exceeding the interference measurement by the threshold.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for establishing an initial sidelink connection with the previously measured UE before determining that the measured interference associated with the target UE exceeds the interference measurement associated with the previously measured UE by the threshold.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for disconnecting from the previously measured UE based on determining that the measured interference associated with the target UE exceeds the interference measurement associated with the previously measured UE by the threshold.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, establishing the sidelink communications link may include operations, features, means, or instructions for establishing the sidelink communications link with the target UE based on disconnecting from the previously measured UE.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting, to the previously measured UE, a report indicating that the measured interference associated with the target UE exceeds the interference measurement associated with the previously measured UE by the threshold.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving a sidelink connection release message from the previously measured UE in response to the report.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting, to a base station serving the UE, a report indicating that the measured interference associated with the target UE exceeds the interference measurement associated with the previously measured UE by the threshold.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for measuring interference from a second UE over a subsequent set of measurement resources after measuring interference from one or more candidate UEs over the set of measurement resources. In some examples, the one or more candidate UEs may exclude the second UE. Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining that a measured interference associated with the second UE exceeds a threshold based on measuring interference from the second UE over the subsequent set of measurement resources, and establishing a second sidelink communications link with the second UE based on determining that the measured interference associated with the second UE exceeds the threshold.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining that a measured interference associated with the target UE exceeds a threshold based on the measuring, and determining that an interference measurement associated with a previously measured UE may be below a threshold based on the measuring. Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for selecting the target UE for the sidelink connection with the UE based on the measured interference exceeding the threshold and the interference measurement associated with the previously measured UE being below a second threshold.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, receiving the configuration may include operations, features, means, or instructions for receiving the configuration from a base station or a sidelink UE connected to the UE, the sidelink UE different from the target UE.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, receiving the configuration may include operations, features, means, or instructions for receiving an indication of a measurement threshold, a set of hysteresis values, one or more measurement offsets, a time to trigger duration, or any combination thereof. In some examples, the target UE may be selected based on the measurement threshold, the set of hysteresis values, the one or more measurement offsets, the time to trigger duration, or any combination thereof.

A method of wireless communications at a first UE is described. The method may include establishing a sidelink communications link with a second UE, and receiving, from the second UE, a report indicating that a measured interference associated with a third UE exceeds an interference measurement associated with the first UE by a threshold. The method may further include transmitting, to the second UE, a sidelink connection release message in response to the report. In some examples, the sidelink connection release message may instruct the second UE to disconnect the sidelink communications link.

An apparatus for wireless communications at a first UE is described. The apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to establish a sidelink communications link with a second UE, receive, from the second UE, a report indicating that a measured interference associated with a third UE exceeds an interference measurement associated with the first UE by a threshold, and transmit, to the second UE, a sidelink connection release message in response to the report, the sidelink connection release message instructing the second UE to disconnect the sidelink communications link.

Another apparatus for wireless communications at a first UE is described. The apparatus may include means for establishing a sidelink communications link with a second UE, and receiving, from the second UE, a report indicating that a measured interference associated with a third UE exceeds an interference measurement associated with the first UE by a threshold. The apparatus may further include means for transmitting, to the second UE, a sidelink connection release message in response to the report. In some examples, the sidelink connection release message may instruct the second UE to disconnect the sidelink communications link.

A non-transitory computer-readable medium storing code for wireless communications at a first UE is described. The code may include instructions executable by a processor to establish a sidelink communications link with a second UE, and receive, from the second UE, a report indicating that a measured interference associated with a third UE exceeds an interference measurement associated with the first UE by a threshold. The code may further include instructions executable by a processor to transmit, to the second UE, a sidelink connection release message in response to the report. In some examples, the sidelink connection release message may instruct the second UE to disconnect the sidelink communications link.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting the sidelink connection release message may include operations, features, means, or instructions for transmitting an indication to delay disconnection of the sidelink communications link for a time period.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the time period corresponds to a timing for completion of an ongoing communication via the sidelink communications link.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for delaying transmission of the sidelink connection release message until completion of an ongoing communication via the sidelink communications link.

.BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates an example of a wireless communications system that supports interference measurements for sidelink communications in accordance with one or more aspects of the present disclosure.

FIG. 2 illustrates an example of a wireless communications system that supports interference measurements for sidelink communications in accordance with one or more aspects of the present disclosure.

FIG. 3 illustrates an example of a wireless communications system that supports interference measurements for sidelink communications in accordance with one or more aspects of the present disclosure.

FIG. 4 illustrates an example of a cross link interference (CLI) measurement curve that supports interference measurements for sidelink communications in accordance with one or more aspects of the present disclosure.

FIG. 5 illustrates an example of a process flow that supports interference measurements for sidelink communications in accordance with one or more aspects of the present disclosure.

FIGs. 6 and 7 show block diagrams of devices that support interference measurements for sidelink communications in accordance with one or more aspects of the present disclosure.

FIG. 8 shows a block diagram of a communications manager that supports interference measurements for sidelink communications in accordance with one or more aspects of the present disclosure.

FIG. 9 shows a diagram of a system including a device that supports interference measurements for sidelink communications in accordance with one or more aspects of the present disclosure.

FIGs. 10 through 16 show flowcharts illustrating methods that support interference measurements for sidelink communications in accordance with one or more aspects of the present disclosure.

DETAILED DESCRIPTION

In some wireless communications systems, there may be variations in traffic load between different cells, base stations, or UEs at different times. This may result in asymmetric and dynamic changes to uplink and downlink traffic between different cells, base stations, or UEs. Some wireless networks may rely on time division duplexing (TDD) to synchronize uplink and downlink transmissions but in cases where synchronization is not utilized, CLI between one or more UEs may be introduced (e.g., uplink transmissions from one UE may be indicated, received, or measured at another UE) . For example, if a UE is configured to receive downlink communications in one or more symbols and a neighboring UE is configured to transmit uplink communications in the one or more symbols, the UE may experience CLI when attempting to receive the downlink communications.

In some wireless communications systems, a UE (e.g., a UE with reduced capabilities, such as a reduced budget, reduced number of antennas, smaller form factor, etc. ) may attempt to connect to a neighboring UE to reduce power consumption at the UE (e.g., as a data processing server for power consumption) . Additionally or alternatively, the UE may lose connection with a serving cell, and may attempt to connect to one or more neighboring UEs, which may act as relays for communications between the UE and the serving cell. Techniques for selecting a neighboring UE for sidelink communications may increase resource usage and overhead at the UE.

To reduce overhead associated with sidelink communications, a UE may be configured to detect and measure CLI from one or more neighboring UEs and may select one of the neighboring UEs for sidelink communications based on the CLI measurement. In some examples, a UE that detects CLI may be referred to as a victim UE, and the one or more neighboring UEs that transmit to a victim UE resulting in CLI may be referred to as aggressor UEs. For example, the victim UE may attempt to connect to a neighboring UE to reduce power consumption at the victim UE, or if the victim UE is out of coverage of the network (e.g., the neighboring UE may act as a relay node) . In some examples, the victim UE may select an aggressor UE (e.g., from a group of neighboring UEs) based on a measured strength, quality, or both, of a CLI measurement associated with the aggressor UE. The CLI measurement may indicate a condition of the channel between the victim UE and the aggressor UE. For example, a stronger CLI measurement may indicate that the channel between the victim UE and the aggressor UE may provide for a more stable sidelink connection than a channel between the victim UE and a neighboring UE with a weaker CLI measurement (e.g., the aggressor UE may be closer to the victim UE) .

A victim UE may receive a CLI measurement resource configuration from a base station or another UE. The victim UE may measure CLI from aggressor UEs based on receiving the measurement resource configuration. In some examples, the victim UE may be connected to a first UE via a sidelink connection, and the victim UE may determine to establish a connection with an aggressor UE based on a change in a sidelink channel condition, such as a channel triggering condition (e.g., a change in the channel between the victim UE and the first UE, the channel between the victim UE and the second aggressor UE, another sidelink channel, or a combination of these) . For example, the victim UE may determine to connect to an aggressor UE if a CLI measurement (e.g., a strength and quality of the CLI measurement) from the aggressor UE is above a threshold (e.g., a configured threshold above the CLI measurement for a current sidelink connection) for a configured period of time. In one example, the threshold for CLI measurements may be pre-configured by a network entity. In some examples, the victim UE may apply an offset value to the CLI of the current sidelink connection to increase the CLI threshold required for a change in the sidelink connection.

In some cases, a victim UE may determine to disconnect from a current sidelink connection and switch to a new sidelink connection autonomously (e.g., based on signaling from the currently connected UE or signaling from a base station) . For example, the victim UE may autonomously determine to disconnect from the current sidelink connection and establish a new sidelink connection once the victim UE measures a channel triggering condition. Additionally or alternatively, if the victim UE is currently connected to another UE, which may be a connected aggressor UE, the victim UE may report the channel triggering condition to the connected aggressor UE, and the aggressor UE may determine when the victim UE is to switch sidelink connections. In another example, if the victim UE is currently connected to a base station, the victim UE may report the channel triggering condition to a base station and the base station may determine when the victim UE is to switch sidelink connections.

By determining to connect to an aggressor UE based on a CLI measurement, a victim UE may reduce latency associated with communications, and the victim UE may use fewer resources for performing communications and connecting to a network.

Aspects of the disclosure are initially described in the context of wireless communications systems. Additional aspects are described in the with reference to CLI measurement curves and process flows. Aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flowcharts that relate to interference measurements for sidelink communications.

FIG. 1 illustrates an example of a wireless communications system 100 that supports interference measurements for sidelink communications in accordance with one or more aspects of the present disclosure. The wireless communications system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communications system 100 may be an LTE network, an LTE-A network, an LTE-A Pro network, or an NR network. In some examples, the wireless communications system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission critical) communications, low latency communications, communications with low-cost and low-complexity devices, or any combination thereof.

The base stations 105 may be dispersed throughout a geographic area to form the wireless communications system 100 and may be devices in different forms or having different capabilities. The base stations 105 and the UEs 115 may wirelessly communicate via one or more communication links 125. Each base station 105 may provide a coverage area 110 over which the UEs 115 and the base station 105 may establish one or more communication links 125. The coverage area 110 may be an example of a geographic area over which a base station 105 and a UE 115 may support the communication of signals according to one or more radio access technologies.

The UEs 115 may be dispersed throughout a coverage area 110 of the wireless communications system 100, and each UE 115 may be stationary, or mobile, or both at different times. The UEs 115 may be devices in different forms or having different capabilities. Some example UEs 115 are illustrated in FIG. 1. The UEs 115 described herein may be able to communicate with various types of devices, such as other UEs 115, the base stations 105, or network equipment (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network equipment) , as shown in FIG. 1.

The base stations 105 may communicate with the core network 130, or with one another, or both. For example, the base stations 105 may interface with the core network 130 through one or more backhaul links 120 (e.g., via an S1, N2, N3, or other interface) . The base stations 105 may communicate with one another over the backhaul links 120 (e.g., via an X2, Xn, or other interface) either directly (e.g., directly between base stations 105) , or indirectly (e.g., via core network 130) , or both. In some examples, the backhaul links 120 may be or include one or more wireless links.

One or more of the base stations 105 described herein may include or may be referred to by a person having ordinary skill in the art as a base transceiver station, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB) , a next-generation NodeB or a giga-NodeB (either of which may be referred to as a gNB) , a Home NodeB, a Home eNodeB, or other suitable terminology.

A UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where the “device” may also be referred to as a unit, a station, a terminal, or a client, among other examples. A UE 115 may also include or may be referred to as a personal electronic device such as a cellular phone, a personal digital assistant (PDA) , a tablet computer, a laptop computer, or a personal computer. In some examples, a UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communications (MTC) device, among other examples, which may be implemented in various objects such as appliances, or vehicles, meters, among other examples.

The UEs 115 described herein may be able to communicate with various types of devices, such as other UEs 115 that may sometimes act as relays as well as the base stations 105 and the network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples, as shown in FIG. 1.

The UEs 115 and the base stations 105 may wirelessly communicate with one another via one or more communication links 125 over one or more carriers. The term “carrier” may refer to a set of radio frequency spectrum resources having a defined physical layer structure for supporting the communication links 125. For example, a carrier used for a communication link 125 may include a portion of a radio frequency spectrum band (e.g., a bandwidth part (BWP) ) that is operated according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR) . Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information) , control signaling that coordinates operation for the carrier, user data, or other signaling. The wireless communications system 100 may support communication with a UE 115 using carrier aggregation or multi-carrier operation. A UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used with both frequency division duplexing (FDD) and TDD component carriers.

In some examples (e.g., in a carrier aggregation configuration) , a carrier may also have acquisition signaling or control signaling that coordinates operations for other carriers. A carrier may be associated with a frequency channel (e.g., an evolved universal mobile telecommunication system terrestrial radio access (E-UTRA) absolute radio frequency channel number (EARFCN) ) and may be positioned according to a channel raster for discovery by the UEs 115. A carrier may be operated in a standalone mode where initial acquisition and connection may be conducted by the UEs 115 via the carrier, or the carrier may be operated in a non-standalone mode where a connection is anchored using a different carrier (e.g., of the same or a different radio access technology) .

The communication links 125 shown in the wireless communications system 100 may include uplink transmissions from a UE 115 to a base station 105, or downlink transmissions from a base station 105 to a UE 115. Carriers may carry downlink or uplink communications (e.g., in an FDD mode) or may be configured to carry downlink and uplink communications (e.g., in a TDD mode) .

A carrier may be associated with a particular bandwidth of the radio frequency spectrum, and in some examples the carrier bandwidth may be referred to as a “system bandwidth” of the carrier or the wireless communications system 100. For example, the carrier bandwidth may be one of a number of determined bandwidths for carriers of a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz) ) . Devices of the wireless communications system 100 (e.g., the base stations 105, the UEs 115, or both) may have hardware configurations that support communications over a particular carrier bandwidth or may be configurable to support communications over one of a set of carrier bandwidths. In some examples, the wireless communications system 100 may include base stations 105 or UEs 115 that support simultaneous communications via carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured for operating over portions (e.g., a sub-band, a BWP) or all of a carrier bandwidth.

Signal waveforms transmitted over a carrier may be made up of multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM) ) . In a system employing MCM techniques, a resource element may consist of one symbol period (e.g., a duration of one modulation symbol) and one subcarrier, where the symbol period and subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both) . Thus, the more resource elements that a UE 115 receives and the higher the order of the modulation scheme, the higher the data rate may be for the UE 115. A wireless communications resource may refer to a combination of a radio frequency spectrum resource, a time resource, and a spatial resource (e.g., spatial layers or beams) , and the use of multiple spatial layers may further increase the data rate or data integrity for communications with a UE 115.

One or more numerologies for a carrier may be supported, where a numerology may include a subcarrier spacing (Δf) and a cyclic prefix. A carrier may be divided into one or more BWPs having the same or different numerologies. In some examples, a UE 115 may be configured with multiple BWPs. In some examples, a single BWP for a carrier may be active at a given time and communications for the UE 115 may be restricted to one or more active BWPs.

The time intervals for the base stations 105 or the UEs 115 may be expressed in multiples of a basic time unit which may, for example, refer to a sampling period of T _s= 1/ (Δf _max·N _f) seconds, where Δf _max may represent the maximum supported subcarrier spacing, and N _f may represent the maximum supported discrete Fourier transform (DFT) size. Time intervals of a communications resource may be organized according to radio frames each having a specified duration (e.g., 10 milliseconds (ms) ) . Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023) .

Each frame may include multiple consecutively numbered subframes or slots, and each subframe or slot may have the same duration. In some examples, a frame may be divided (e.g., in the time domain) into subframes, and each subframe may be further divided into a number of slots. Alternatively, each frame may include a variable number of slots, and the number of slots may depend on subcarrier spacing. Each slot may include a number of symbol periods (e.g., depending on the length of the cyclic prefix prepended to each symbol period) . In some wireless communications systems 100, a slot may further be divided into multiple mini-slots containing one or more symbols. Excluding the cyclic prefix, each symbol period may contain one or more (e.g., N _f) sampling periods. The duration of a symbol period may depend on the subcarrier spacing or frequency band of operation.

A subframe, a slot, a mini-slot, or a symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communications system 100 and may be referred to as a transmission time interval (TTI) . In some examples, the TTI duration (e.g., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communications system 100 may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs) ) .

Physical channels may be multiplexed on a carrier according to various techniques. A physical control channel and a physical data channel may be multiplexed on a downlink carrier, for example, using one or more of time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques. A control region (e.g., a control resource set (CORESET) ) for a physical control channel may be defined by a number of symbol periods and may extend across the system bandwidth or a subset of the system bandwidth of the carrier. One or more control regions (e.g., CORESETs) may be configured for a set of the UEs 115. For example, one or more of the UEs 115 may monitor or search control regions for control information according to one or more search space sets, and each search space set may include one or multiple control channel candidates in one or more aggregation levels arranged in a cascaded manner. An aggregation level for a control channel candidate may refer to a number of control channel resources (e.g., control channel elements (CCEs) ) associated with encoded information for a control information format having a given payload size. Search space sets may include common search space sets configured for sending control information to multiple UEs 115 and UE-specific search space sets for sending control information to a specific UE 115.

Each base station 105 may provide communication coverage via one or more cells, for example a macro cell, a small cell, a hot spot, or other types of cells, or any combination thereof. The term “cell” may refer to a logical communication entity used for communication with a base station 105 (e.g., over a carrier) and may be associated with an identifier for distinguishing neighboring cells (e.g., a physical cell identifier (PCID) , a virtual cell identifier (VCID) , or others) . In some examples, a cell may also refer to a geographic coverage area 110 or a portion of a geographic coverage area 110 (e.g., a sector) over which the logical communication entity operates. Such cells may range from smaller areas (e.g., a structure, a subset of structure) to larger areas depending on various factors such as the capabilities of the base station 105. For example, a cell may be or include a building, a subset of a building, or exterior spaces between or overlapping with geographic coverage areas 110, among other examples.

A macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by the UEs 115 with service subscriptions with the network provider supporting the macro cell. A small cell may be associated with a lower-powered base station 105, as compared with a macro cell, and a small cell may operate in the same or different (e.g., licensed, unlicensed) frequency bands as macro cells. Small cells may provide unrestricted access to the UEs 115 with service subscriptions with the network provider or may provide restricted access to the UEs 115 having an association with the small cell (e.g., the UEs 115 in a closed subscriber group (CSG) , the UEs 115 associated with users in a home or office) . A base station 105 may support one or multiple cells and may also support communications over the one or more cells using one or multiple component carriers.

In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., MTC, narrowband IoT (NB-IoT) , enhanced mobile broadband (eMBB) ) that may provide access for different types of devices.

In some examples, a base station 105 may be movable and therefore provide communication coverage for a moving geographic coverage area 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but the different geographic coverage areas 110 may be supported by the same base station 105. In other examples, the overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. The wireless communications system 100 may include, for example, a heterogeneous network in which different types of the base stations 105 provide coverage for various geographic coverage areas 110 using the same or different radio access technologies.

The wireless communications system 100 may support synchronous or asynchronous operation. For synchronous operation, the base stations 105 may have similar frame timings, and transmissions from different base stations 105 may be approximately aligned in time. For asynchronous operation, the base stations 105 may have different frame timings, and transmissions from different base stations 105 may, in some examples, not be aligned in time. The techniques described herein may be used for either synchronous or asynchronous operations.

Some UEs 115, such as MTC or IoT devices, may be low cost or low complexity devices and may provide for automated communication between machines (e.g., via Machine-to-Machine (M2M) communication) . M2M communication or MTC may refer to data communication technologies that allow devices to communicate with one another or a base station 105 without human intervention. In some examples, M2M communication or MTC may include communications from devices that integrate sensors or meters to measure or capture information and relay such information to a central server or application program that makes use of the information or presents the information to humans interacting with the application program. Some UEs 115 may be designed to collect information or enable automated behavior of machines or other devices. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based business charging.

Some UEs 115 may be configured to employ operating modes that reduce power consumption, such as half-duplex communications (e.g., a mode that supports one-way communication via transmission or reception, but not transmission and reception simultaneously) . In some examples, half-duplex communications may be performed at a reduced peak rate. Other power conservation techniques for the UEs 115 include entering a power saving deep sleep mode when not engaging in active communications, operating over a limited bandwidth (e.g., according to narrowband communications) , or a combination of these techniques. For example, some UEs 115 may be configured for operation using a narrowband protocol type that is associated with a defined portion or range (e.g., set of subcarriers or resource blocks (RBs) ) within a carrier, within a guard-band of a carrier, or outside of a carrier.

The wireless communications system 100 may be configured to support ultra-reliable communications or low-latency communications, or various combinations thereof. For example, the wireless communications system 100 may be configured to support ultra-reliable low-latency communications (URLLC) or mission critical communications. The UEs 115 may be designed to support ultra-reliable, low-latency, or critical functions (e.g., mission critical functions) . Ultra-reliable communications may include private communication or group communication and may be supported by one or more mission critical services such as mission critical push-to-talk (MCPTT) , mission critical video (MCVideo) , or mission critical data (MCData) . Support for mission critical functions may include prioritization of services, and mission critical services may be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, mission critical, and ultra-reliable low-latency may be used interchangeably herein.

In some examples, a UE 115 may also be able to communicate directly with other UEs 115 over a device-to-device (D2D) communication link 135 (e.g., using a peer-to-peer (P2P) or D2D protocol) . One or more UEs 115 utilizing D2D communications may be within the geographic coverage area 110 of a base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of a base station 105 or be otherwise unable to receive transmissions from a base station 105. In some examples, groups of the UEs 115 communicating via D2D communications may utilize a one-to-many (1: M) system in which each UE 115 transmits to every other UE 115 in the group. In some examples, a base station 105 facilitates the scheduling of resources for D2D communications. In other cases, D2D communications are carried out between the UEs 115 without the involvement of a base station 105.

In some systems, the D2D communication link 135 may be an example of a communication channel, such as a sidelink communication channel, between vehicles (e.g., UEs 115) . In some examples, vehicles may communicate using vehicle-to-everything (V2X) communications, vehicle-to-vehicle (V2V) communications, or some combination of these. A vehicle may signal information related to traffic conditions, signal scheduling, weather, safety, emergencies, or any other information relevant to a V2X system. In some examples, vehicles in a V2X system may communicate with roadside infrastructure, such as roadside units, or with the network via one or more network nodes (e.g., base stations 105) using vehicle-to-network (V2N) communications, or with both.

The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or 5G core (5GC) , which may include at least one control plane entity that manages access and mobility (e.g., a mobility management entity (MME) , an access and mobility management function (AMF) ) and at least one user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW) , a Packet Data Network (PDN) gateway (P-GW) , or a user plane function (UPF) ) . The control plane entity may manage non-access stratum (NAS) functions such as mobility, authentication, and bearer management for the UEs 115 served by the base stations 105 associated with the core network 130. User IP packets may be transferred through the user plane entity, which may provide IP address allocation as well as other functions. The user plane entity may be connected to the network operators IP services 150. The network operators IP services 150 may include access to the Internet, Intranet (s) , an IP Multimedia Subsystem (IMS) , or a Packet-Switched Streaming Service.

Some of the network devices, such as a base station 105, may include subcomponents such as an access network entity 140, which may be an example of an access node controller (ANC) . Each access network entity 140 may communicate with the UEs 115 through one or more other access network transmission entities 145, which may be referred to as radio heads, smart radio heads, or transmission/reception points (TRPs) . Each access network transmission entity 145 may include one or more antenna panels. In some configurations, various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio heads and ANCs) or consolidated into a single network device (e.g., a base station 105) .

The wireless communications system 100 may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz) . Generally, the region from 300 MHz to 3 GHz is known as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from approximately one decimeter to one meter in length. The UHF waves may be blocked or redirected by buildings and environmental features, but the waves may penetrate structures sufficiently for a macro cell to provide service to the UEs 115 located indoors. The transmission of UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers) compared to transmission using the smaller frequencies and longer waves of the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz.

The wireless communications system 100 may also operate in a super high frequency (SHF) region using frequency bands from 3 GHz to 30 GHz, also known as the centimeter band, or in an extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz) , also known as the millimeter band. In some examples, the wireless communications system 100 may support millimeter wave (mmW) communications between the UEs 115 and the base stations 105, and EHF antennas of the respective devices may be smaller and more closely spaced than UHF antennas. In some examples, this may facilitate use of antenna arrays within a device. The propagation of EHF transmissions, however, may be subject to even greater atmospheric attenuation and shorter range than SHF or UHF transmissions. The techniques disclosed herein may be employed across transmissions that use one or more different frequency regions, and designated use of bands across these frequency regions may differ by country or regulating body.

The electromagnetic spectrum is often subdivided, based on frequency/wavelength, into various classes, bands, channels, etc. In 5G NR two initial operating bands have been identified as frequency range designations FR1 (410 MHz – 7.125 GHz) and FR2 (24.25 GHz –52.6 GHz) . The frequencies between FR1 and FR2 are often referred to as mid-band frequencies. Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to (interchangeably) as a “Sub-6 GHz” band in various documents and articles. A similar nomenclature issue sometimes occurs with regard to FR2, which is often referred to (interchangeably) as a “millimeter wave” band in documents and articles, despite being different from the extremely high frequency (EHF) band (30 GHz –300 GHz) which is identified by the International Telecommunications Union (ITU) as a “millimeter wave” band.

With the above aspects in mind, unless specifically stated otherwise, it should be understood that the term “sub-6 GHz” or the like if used herein may broadly represent frequencies that may be less than 6 GHz, may be within FR1, or may include mid-band frequencies. Further, unless specifically stated otherwise, it should be understood that the term “millimeter wave” or the like if used herein may broadly represent frequencies that may include mid-band frequencies, may be within FR2, or may be within the EHF band

The wireless communications system 100 may utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communications system 100 may employ License Assisted Access (LAA) , LTE-Unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band such as the 5 GHz industrial, scientific, and medical (ISM) band. When operating in unlicensed radio frequency spectrum bands, devices such as the base stations 105 and the UEs 115 may employ carrier sensing for collision detection and avoidance. In some examples, operations in unlicensed bands may be based on a carrier aggregation configuration in conjunction with component carriers operating in a licensed band (e.g., LAA) . Operations in unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among other examples.

A base station 105 or a UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of a base station 105 or a UE 115 may be located within one or more antenna arrays or antenna panels, which may support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower. In some examples, antennas or antenna arrays associated with a base station 105 may be located in diverse geographic locations. A base station 105 may have an antenna array with a number of rows and columns of antenna ports that the base station 105 may use to support beamforming of communications with a UE 115. Likewise, a UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations. Additionally or alternatively, an antenna panel may support radio frequency beamforming for a signal transmitted via an antenna port.

The base stations 105 or the UEs 115 may use MIMO communications to exploit multipath signal propagation and increase the spectral efficiency by transmitting or receiving multiple signals via different spatial layers. Such techniques may be referred to as spatial multiplexing. The multiple signals may, for example, be transmitted by the transmitting device via different antennas or different combinations of antennas. Likewise, the multiple signals may be received by the receiving device via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords) . Different spatial layers may be associated with different antenna ports used for channel measurement and reporting. MIMO techniques include single-user MIMO (SU-MIMO) , where multiple spatial layers are transmitted to the same receiving device, and multiple-user MIMO (MU-MIMO) , where multiple spatial layers are transmitted to multiple devices.

Beamforming, which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station 105, a UE 115) to shape or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining the signals communicated via antenna elements of an antenna array such that some signals propagating at particular orientations with respect to an antenna array experience constructive interference while others experience destructive interference. The adjustment of signals communicated via the antenna elements may include a transmitting device or a receiving device applying amplitude offsets, phase offsets, or both to signals carried via the antenna elements associated with the device. The adjustments associated with each of the antenna elements may be defined by a beamforming weight set associated with a particular orientation (e.g., with respect to the antenna array of the transmitting device or receiving device, or with respect to some other orientation) .

A base station 105 or a UE 115 may use beam sweeping techniques as part of beam forming operations. For example, a base station 105 may use multiple antennas or antenna arrays (e.g., antenna panels) to conduct beamforming operations for directional communications with a UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted by a base station 105 multiple times in different directions. For example, the base station 105 may transmit a signal according to different beamforming weight sets associated with different directions of transmission. Transmissions in different beam directions may be used to identify (e.g., by a transmitting device, such as a base station 105, or by a receiving device, such as a UE 115) a beam direction for later transmission or reception by the base station 105.

Some signals, such as data signals associated with a particular receiving device, may be transmitted by a base station 105 in a single beam direction (e.g., a direction associated with the receiving device, such as a UE 115) . In some examples, the beam direction associated with transmissions along a single beam direction may be determined based on a signal that was transmitted in one or more beam directions. For example, a UE 115 may receive one or more of the signals transmitted by the base station 105 in different directions and may report to the base station 105 an indication of the signal that the UE 115 received with a highest signal quality or an otherwise acceptable signal quality.

In some examples, transmissions by a device (e.g., by a base station 105 or a UE 115) may be performed using multiple beam directions, and the device may use a combination of digital precoding or radio frequency beamforming to generate a combined beam for transmission (e.g., from a base station 105 to a UE 115) . The UE 115 may report feedback that indicates precoding weights for one or more beam directions, and the feedback may correspond to a configured number of beams across a system bandwidth or one or more sub-bands. The base station 105 may transmit a reference signal (e.g., a cell-specific reference signal (CRS) , a channel state information reference signal (CSI-RS) ) , which may be precoded or unprecoded. The UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., a multi-panel type codebook, a linear combination type codebook, a port selection type codebook) . Although these techniques are described with reference to signals transmitted in one or more directions by a base station 105, a UE 115 may employ similar techniques for transmitting signals multiple times in different directions (e.g., for identifying a beam direction for subsequent transmission or reception by the UE 115) or for transmitting a signal in a single direction (e.g., for transmitting data to a receiving device) .

A receiving device (e.g., a UE 115) may try multiple receive configurations (e.g., directional listening) when receiving various signals from the base station 105, such as synchronization signals, reference signals, beam selection signals, or other control signals. For example, a receiving device may try multiple receive directions by receiving via different antenna subarrays, by processing received signals according to different antenna subarrays, by receiving according to different receive beamforming weight sets (e.g., different directional listening weight sets) applied to signals received at multiple antenna elements of an antenna array, or by processing received signals according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, any of which may be referred to as “listening” according to different receive configurations or receive directions. In some examples, a receiving device may use a single receive configuration to receive along a single beam direction (e.g., when receiving a data signal) . The single receive configuration may be aligned in a beam direction determined based on listening according to different receive configuration directions (e.g., a beam direction determined to have a highest signal strength, highest signal-to-noise ratio (SNR) , or otherwise acceptable signal quality based on listening according to multiple beam directions) .

The wireless communications system 100 may be a packet-based network that operates according to a layered protocol stack. In the user plane, communications at the bearer or Packet Data Convergence Protocol (PDCP) layer may be IP-based. A Radio Link Control (RLC) layer may perform packet segmentation and reassembly to communicate over logical channels. A Medium Access Control (MAC) layer may perform priority handling and multiplexing of logical channels into transport channels. The MAC layer may also use error detection techniques, error correction techniques, or both to support retransmissions at the MAC layer to improve link efficiency. In the control plane, the Radio Resource Control (RRC) protocol layer may provide establishment, configuration, and maintenance of an RRC connection between a UE 115 and a base station 105 or a core network 130 supporting radio bearers for user plane data. At the physical layer, transport channels may be mapped to physical channels.

The UEs 115 and the base stations 105 may support retransmissions of data to increase the likelihood that data is received successfully. Hybrid automatic repeat request (HARQ) feedback is one technique for increasing the likelihood that data is received correctly over a communication link 125. HARQ may include a combination of error detection (e.g., using a cyclic redundancy check (CRC) ) , forward error correction (FEC) , and retransmission (e.g., automatic repeat request (ARQ) ) . HARQ may improve throughput at the MAC layer in poor radio conditions (e.g., low signal-to-noise conditions) . In some examples, a device may support same-slot HARQ feedback, where the device may provide HARQ feedback in a specific slot for data received in a previous symbol in the slot. In other cases, the device may provide HARQ feedback in a subsequent slot, or according to some other time interval.

In some examples, a UE 115 may include a communications manager 101 configured to detect and measure CLI from one or more neighboring (e.g., aggressor) UEs 115. The communications manager 101 may be configured to select a target UE 115 for sidelink communications based on the measured CLI. For example, the quality and strength of the measured CLI from each aggressor UE 115 may indicate a condition of the channel between the UE 115 and a respective aggressor UE 115. A stronger CLI measurement from a first aggressor UE 115 may indicate that the channel between the victim UE 115 and the first aggressor UE 115 may provide a more stable sidelink connection as compared to a second aggressor UE 115 having a weaker CLI measurement.

In some examples, a victim UE 115 may select an aggressor UE 115 as a target UE for sidelink communications based on one or more CLI triggering conditions, such as a pre-configured CLI threshold value, a CLI timer, a history of CLI measurements stored at the victim UE 115, or some combination thereof. In some cases, the victim UE 115 may determine to disconnect from a current sidelink connection and switch to a new sidelink connection based on the one or more CLI triggering conditions. The victim UE 115 may establish a sidelink connection or perform a switch in sidelink connections autonomously, based on signaling from a base station 105, or based on signaling from another sidelink UE 115. As such, by selecting a UE 115 for sidelink communications based on CLI measurements, the victim UE 115 may reduce overhead associated with communications and use fewer resources for performing communications and connecting to a network.

FIG. 2 illustrates an example of a wireless communications system 200 that supports interference measurements for sidelink communications in accordance with one or more aspects of the present disclosure. In some examples, wireless communications system 200 may implement aspects of wireless communications system 100.

The wireless communications system 200 may include base stations 105-a and 105-b, and UEs 115-a, 115-b, 115-c, and 115-d, which may be examples of a base station 105 and a UE 115 as described with reference to FIG. 1. Base station 105-a and base station 105-b may communicate with the UEs 115 within geographic coverage areas 110-a and 110-b, respectively, and over one or more downlink communication channels 205 (e.g., downlink communication channels 205-a and 205-b) , uplink communication channels 210 (e.g., uplink communication channels 210-a and 210-b) , or both. Further, each of coverage areas 110-a and 110-b may correspond to respective cells. In some implementations, one or more UEs 115 (e.g., UEs 115-a and 115-c) may measure CLI 220 from another UE 115 (e.g., aggressor UEs 115) to determine whether to establish a sidelink communication connection via a sidelink communication channel 215 (e.g., sidelink communication channels 215-a and 215-b) .

In some examples of the wireless communications system 200, a UE 115 (e.g., a victim UE 115) may experience interference, such as CLI 220, from one or more nearby UEs 115 (e.g., aggressor UEs 115) . For example, if a victim UE 115 is configured to receive downlink communications from a serving base station 105 via a one or more symbols, and a neighboring aggressor UE 115 is configured to transmit uplink communications in the one or more symbols, the victim UE 115 may experience CLI 220 when attempting to receive the downlink communications (e.g., due to the uplink transmissions from the neighboring aggressor UE 115, which may be indicated, received, or measured at the victim UE 115) . For example, an aggressor UE 115 may transmit uplink data to a base station 105 via an uplink communication channel 210 (e.g., via one or more symbols, slots, or TTIs within the uplink communication channel 210 that are configured for uplink transmissions) , and a victim UE 115 may experience or measure CLI 220 as a result of the transmitted uplink data. For instance, a victim UE 115 may experience CLI 220 if a base station 105 or other network entity is unable to synchronize the configuration of uplink and downlink transmissions in the network (e.g., TDD synchronization) , which may result in neighboring aggressor UEs 115 transmitting while victim UE 115 is attempting to receive communications (e.g., from another UE 115 or a base station 105) .

One or more UEs 115 of the wireless communications system 200 may be configured to detect and measure CLI 220 from one or more neighboring aggressor UEs 115 in the same or different cells or corresponding coverage areas 110. For example, victim UE 115-c may receive a CLI measurement resource configuration from base station 105-a in a first cell which is a serving cell of UE 115-c associated with coverage area 110-a or from another connected sidelink UE 115, such as UE 115-d in second cell associated with coverage area 110-b. Victim UE 115-c may measure CLI 220-b from neighboring aggressor UE 115-d (e.g., and/or one or more additional aggressor UEs 115 in the same or different cells having corresponding coverage areas 110) based on receiving the CLI measurement resource configuration. In some examples, the CLI measurement resource configuration (e.g., a Layer-3 or Layer-1 measurement configuration) may include a CLI measurement resource for measuring CLI 220 from one or more aggressor UEs 115. The CLI measurement resource may be a periodic resource configuration (e.g., a Layer-3 configuration via RRC signaling or an RRC configuration followed by a downlink control information (DCI) activation) , or an aperiodic resource configuration (e.g., a Layer-1 configuration triggered by DCI) . The victim UE 115 may measure the CLI 220 according to reference signal received power (RSRP) , a received signal strength indicator (RSSI) , a sounding reference signal (SRS) , or some combination thereof. In some examples, the network (e.g., base station 105-a) may determine which UEs 115 are receiving CLI 220 (e.g., which UEs 115 are victim UEs 115) , and the network may configure the victim UEs 115 with CLI measurement resources and refrain from configuring the aggressor UEs 115 for measuring CLI 220 (e.g., the network may reduce the measurement efforts that may occur) . Additionally or alternatively, the network may configure each UE 115 with CLI measurement resources (e.g., both victim UEs 115 and aggressor UEs 115 may be configured to measure CLI 220) .

A victim UE 115 may or may not experience CLI 220 as interference. For example, in some cases, a victim UE 115 may refrain from measuring a downlink signal or downlink data received via a downlink communication channel 205 from a serving base station 105 at the same time that the victim UE 115 measures a configured CLI resource. As such, the CLI 220 may not interfere with communications at the victim UE 115. Additionally or alternatively, the victim UE 115 may receive the downlink communications and the CLI 220 simultaneously, and the CLI 220 may interfere with the ability for the UE 115 to receive and decode the downlink data. In some examples, a base station 105 or another network entity may configure the CLI measurement resource for the victim UE 115 via slots during which an aggressor UE 115 may transmit information corresponding to the CLI measurement resource. In such cases, the CLI 220 may degrade the downlink data reception performance at the victim UE 115 in one or more slots that may not be included in the CLI measurement resource configuration.

In some examples of the wireless communications system 200, a UE 115 with reduced capabilities (reduced budget, reduced number of antennas, smaller form factor, etc. ) may attempt to connect to a neighboring UE 115 (e.g., via a sidelink communication channel 215) to improve communications (e.g., increase reliability) at the reduced capability UE 115. For example, the victim UE 115 may attempt to connect to a neighboring sidelink UE 115 to reduce power consumption at the victim UE 115 (e.g., the victim UE 115 may establish a sidelink connection with a neighbor UE 115 and may use the neighbor UE 115 as a relay or a data processing server for power consumption) . Additionally or alternatively, the reduced capability UE 115 may lose connection with a serving base station 105, and may attempt to connect to one or more neighboring UEs 115, which may act as relays for communications between the UE 115 and the serving base station 105 or cell. In some examples, a reduced capability UE 115 may be configured to detect and measure CLI 220 from one or more neighboring aggressor UEs 115 with which the reduced capability UE 115 may attempt to establish a sidelink connection.

As described herein, a UE 115 may select a nearby UE 115 for sidelink communications based on a measurement of CLI 220 from the nearby UE 115. For example, a victim UE 115 may determine to establish a sidelink connection with an aggressor UE 115 based on the CLI measurement associated with the sidelink communication channel 215 between the victim UE 115 and the aggressor UE 115. A CLI measurement (e.g., one or both of a measured strength and quality of the CLI 220) may indicate a quality of the sidelink communication channel 215 between an aggressor UE 115 and the victim UE 115. For example, a stronger CLI measurement may indicate that the sidelink communication channel 215 between a victim UE 115 and an aggressor UE 115 may provide for a more stable sidelink connection than a sidelink communication channel 215 with a weaker CLI measurement.

In some examples, a CLI measurement may indicate one or more quality parameters corresponding to a respective sidelink communication channel 215. For example, a CLI measurement may indicate a distance between two UEs 115 (e.g., a weak CLI 220 may indicate that the aggressor UE 115 may be far from the victim UE 115) . Additionally or alternatively, a CLI measurement may correlate to a signal strength associated with communications between a victim UE 115 and an aggressor UE 115 (e.g., a strength due to interference in the surrounding environment, physical distance between the UEs 115, a configuration of antennas on one or both of the UEs 115) . The victim UE 115 may thereby use fewer resources for performing communications and establishing sidelink connections if the victim UE 115 selects a target UE 115 of one or more neighboring UEs 115 for sidelink communications based on the CLI 220 from the target UE 115 (e.g., because the victim UE 115 may already be measuring the CLI 220, the victim UE 115 may refrain from performing additional procedures to search for a sidelink connection) .

A victim UE 115 may establish one or more threshold values for CLI measurements, and the victim UE 115 may use the one or more threshold values to determine whether to establish a connection with an aggressor UE 115. For example, victim UE 115-a may determine to connect to aggressor UE 115-b if a CLI measurement (e.g., a strength or quality of CLI 220-a) from the aggressor UE 115-b is above a threshold (e.g., a configured threshold) for a configured period of time. The configured threshold or period of time may be pre-configured or indicated via signaling (e.g., from a base station 105 or other network node) Additionally or alternatively, victim UE 115-a may be connected to another sidelink UE 115 in the same cell corresponding to coverage area 110-a or some other cell (e.g., corresponding to coverage area 110-b) , and victim UE 115-a may determine to switch the sidelink connection based on the measurement of CLI 220-a from UE 115-b or another aggressor UE 115 (e.g., UE 115-a may disconnect from the other sidelink UE 115 and establish a connection with UE 115-b or another aggressor UE 115) .

In some cases, a victim UE 115 may determine to disconnect from a current sidelink connection and switch to a new sidelink connection autonomously (e.g., based on signaling from the current connected UE 115 or signaling from a base station 105) . For example, victim UE 115-c may autonomously determine to disconnect from a current sidelink connection and establish a new sidelink connection with an aggressor UE 115, such as aggressor UE 115-d. Additionally or alternatively, if the victim UE 115 is currently connected to another aggressor UE 115, the victim UE 115 may report a CLI measurement to the connected aggressor UE 115, and the aggressor UE 115 may determine when the victim UE 115 is to switch sidelink connections. In another example, if the victim UE 115 is currently connected to a base station 105, the victim UE 115 may report the CLI measurement to the base station 105 and the base station 105 may determine when the victim UE 115 is to switch sidelink connections.

Thus, a victim UE 115 may be configured to measure CLI 220 from neighboring aggressor UEs 115, and the victim UE 115 may establish a sidelink connection with a neighboring aggressor UE 115 based on a measured value of the CLI 220 from the aggressor UE 115. The victim UE 115 may thereby reduce overhead and latency associated with communications, and the victim UE 115 may use fewer resources for establishing sidelink connections and connecting to the network.

FIG. 3 illustrates an example of a wireless communications system 300 that supports interference measurements for sidelink communications in accordance with one or more aspects of the present disclosure. In some examples, wireless communications system 300 may implement aspects of

wireless communications systems

100 or 200.

The wireless communications system 300 may include base station 105-c, and UEs 115-e, 115-f, and 115-g, which may be examples of a base station 105 and UEs 115 as described with reference to FIGs. 1 and 2. Base station 105-c may communicate with UEs 115-e and 115-g within geographic coverage area 110-c, and over communication channels 305-a and 305-b, respectively. In some implementations of the present disclosure, UE 115-f may be connected to UE 115-e via sidelink connection 310-a, and UE 115-f may determine to switch the sidelink connection 310 (e.g., from sidelink connection 310-a to sidelink connection 310-b) based on one or more CLI measurements associated with the UEs 115-e and 115-g.

In some examples of the wireless communications system 300, UE 115-f may currently be connected to the network via sidelink connection 310-a with UE 115-e. For example, UE 115-f may be a reduced capability UE 115, and UE 115-f may use UE 115-e as a relay node or a data processing server to reduce power consumption at UE 115-f. In one example, UE 115-f may go out of coverage of base station 105-c (e.g., UE 115-f may have reduced capabilities such that UE 115-f may be unable to connect with base station 105-c, or UE 115-f may be unable to maintain a connection with base station 105-c) . However, UE 115-f may be within range of sidelink UE 115-e which may be connected to base station 105-c via communication channel 305-a, and UE 115-f may thereby establish sidelink connection 310-a with UE 115-e to communicate with the network (e.g., UE 115-e may act as a relay node) .

As described with reference to FIG. 2, a victim UE 115, such as victim UE 115-f, may be configured to measure CLI from nearby aggressor UEs 115, such as UEs 115-e and 115-g. A victim UE 115 may thereby attempt to establish a connection with an aggressor UE 115 based on the CLI measurement from the aggressor UE 115. In some examples, the aggressor UEs 115 may be connected to a base station 105 via a communication channels 305, and the aggressor UEs may be referred to as connected UEs 115. In the example of FIG. 3, victim UE 115-f may detect and measure CLI from aggressor UE 115-e, aggressor UE 115-g, one or more other nearby aggressor UEs 115, or a combination thereof, and victim UE 115-f may attempt to establish a connection with aggressor UE 115-e, aggressor UE 115-g, or one or more other nearby UEs 115 based on the respective CLI measurements. Aggressor UEs 115-e and 115-g may be connected UEs 115, and victim UE 115-f may use connected UEs 115-e or 115-g for connecting to the network (e.g., via base station 105-c) .

In some examples, a victim UE 115 may be connected to a first aggressor UE 115 via a sidelink connection 310 (e.g., the first aggressor UE 115 may be a connected UE 115, and the first aggressor UE 115 may be currently acting as a relay server) , and the victim UE 115 may determine to establish a connection with a second aggressor UE 115 based on a change in a condition of a sidelink communication channel, such as a channel triggering condition (e.g., a change in the channel between the victim UE 115 and a first UE 115, the channel between the victim UE 115 and a second UE 115, another sidelink communication channel, or a combination of these) . For example, victim UE 115-f may be connected to aggressor UE 115-e via sidelink connection 310-a, and victim UE 115-f may receive and measure CLI from aggressor UE 115-e and aggressor UE 115-g. UE 115-f may determine to connect to aggressor UE-g if a CLI measurement (e.g., a strength and quality of the CLI measurement) from aggressor UE 115-g is above a threshold (e.g., a pre-configured threshold above the CLI measurement from UE 115-e for the current sidelink connection 310-a) for a pre-configured period of time. In some examples, victim UE 115-f may apply an offset value to the CLI of the current sidelink connection 310-a to increase the CLI threshold required for a change in the sidelink connection 310.

Victim UE 115-f may determine to maintain a current sidelink connection 310-a, switch sidelink connections 310, measure CLI from other nearby UEs 115 for sidelink purposes, or a combination of these, based on one or more channel triggering events (e.g., one or more CLI measurement events which may be similar to events for resource measurement for mobility during radio resource management (RRM) communications) . For example, victim UE 115-f may use one or more preconfigured thresholds for CLI measurements, one or more time periods to determine a consistency of the CLI measurements, a history of CLI measurements from previous and current sidelink connections 310, or a combination thereof to determine when a channel triggering event occurs.

One or more of the channel triggering events may indicate to victim UE 115-f that victim UE 115-f may refrain from measuring CLI from nearby aggressor UEs 115, and victim UE 115-f may maintain the current sidelink connection, such as sidelink connection 310-a. Additionally or alternatively, one or more channel triggering events may indicate that victim UE 115-f is to continue measuring CLI from nearby aggressor UEs 115 to attempt to establish a sidelink connection or switch a current sidelink connection. For example, in a first channel triggering event, victim UE 115-f may determine that the CLI measurement from UE 115-e for the current sidelink connection 310-a may be higher than a pre-configured CLI threshold. Victim UE 115-f may thereby maintain the current sidelink connection 310-a to connected UE 115-e, and victim UE 115-f may refrain from measuring CLI from other neighboring aggressor UEs 115 for sidelink connection purposes. In a second example of a channel triggering event, victim UE 115-f may determine that the CLI measurement from UE 115-e for the current sidelink connection 310-a is below the pre-configured CLI threshold, and victim UE 115-f may start measuring CLI from other neighboring aggressor UEs 115 for sidelink connection purposes (e.g., to find another aggressor UE 115 to connect to for relay purposes) .

In some cases, victim UE 115-f may maintain a history of CLI measurements from neighboring UEs 115 that victim UE 115-f may or may not have previously connected to, and one or more of the channel triggering events may be based on the CLI measurement history. The CLI measurement history may include a CLI measurement that victim UE 115-f may select (e.g., which may be the strongest or highest CLI measurement included in the CLI measurement history) . For example, a channel triggering event may occur if victim UE 115-f determines that a CLI measurement from a nearby aggressor UE 115, such as aggressor UE 115-g, is higher by a threshold than the current CLI measurement from a UE 115 that has the strongest or highest CLI measurement in the CLI measurement history, victim UE 115-f may identify the CLI measurement from aggressor UE 115-g as the new UE 115, and victim UE 115-f may consider connecting to aggressor UE 115-g accordingly. Additionally or alternatively, victim UE 115-f may determine that a CLI measurement from another aggressor UE 115 that is not previously considered as the strongest UE 115 in terms of CLI measurement is higher than a pre-configured threshold (e.g., the CLI measurement may be better than the previous CLI measurement) , and victim UE 115-f may attempt to establish a sidelink connection 310 with the corresponding aggressor UE 115. In some examples, the CLI measurement of the UE 115 that may have been previously identified as the strongest aggressor UE 115 in history may drop below a first threshold, and a CLI measurement of second aggressor UE 115 may be greater than a second threshold. In such examples, victim UE 115-f may determine to establish a connection with the second aggressor UE 115.

Victim UE 115-f may be configured with a CLI timer that may be used to determine a reliability and consistency associated with the CLI measurements during the channel triggering events. For example, victim UE 115-f may identify one or more of the channel triggering events outlined previously, and UE 115-f may start a timer (e.g., for a pre-configured period of time, such as a CLI trigger period) such that UE 115-f may determine that the channel triggering condition consistently holds. For example, UE 115-f may identify that the CLI measurement from UE 115-e is the strongest CLI measurement in the CLI measurement history stored at UE 115-f. UE 115-f may subsequently determine that the CLI measurement from UE 115-g is higher than the current CLI measurement by the respective pre-configured CLI threshold. UE 115-f may therefore attempt to establish sidelink connection 310-b with UE 115-g if the CLI measurement remains higher by at least the pre-configured threshold for at least the pre-configured CLI trigger period. If the CLI measurement drops below the pre-configured threshold within the CLI trigger period, victim UE 115-f may determine that the channel triggering condition was not met, and the channel triggering event may be invalid.

If victim UE 115-f identifies a channel triggering event that indicates victim UE 115-f may establish a new sidelink connection 310 or switch sidelink connections 310, victim UE 115-f may establish the sidelink connection 310 autonomously, based on signaling from a sidelink connected UE 115, or signaling from base station 105-c. For example, victim UE 115-f may autonomously determine to disconnect from current sidelink connection 310-a and establish a new sidelink connection 310 once victim UE 115-f measures a channel triggering condition. Additionally or alternatively, if victim UE 115-f is currently connected to aggressor UE 115-e, victim UE 115-f may report the channel triggering condition to connected aggressor UE 115-e, and aggressor UE 115-e may determine when victim UE 115-f is to switch sidelink connections 310 (e.g., aggressor UE 115-e may indicate that victim UE 115-f is to disconnect from sidelink connection 310-a immediately or after a duration of time that allows for the current sidelink communications to finish) . In another example, if victim UE 115-f is connected to base station 105-c, victim UE 115-f may report the channel triggering condition to base station 105-c and base station 105-c may determine when victim UE 115-f is to switch sidelink connections 310.

In some examples, a victim UE 115 may receive interference, such as CLI, from an aggressor UE 115 even if the victim UE 115 establishes a sidelink connection 310 with the aggressor UE 115. For example, victim UE 115-f may establish sidelink connection 310-a with aggressor UE 115-e, but aggressor UE 115-e may still transmit uplink data to base station 105-c via communication channel 305-a. The uplink communications between aggressor UE 115-e and base station 105-c may be received at victim UE 115-f as CLI regardless of the sidelink connection 310-a. Thus, victim UE 115-f may determine to establish sidelink connections 310-a or 310-b with aggressor UEs 115-e or 115-g, respectively, but victim UE 115-f may still receive CLI from one or both of the aggressor UEs 115-e and 115-g.

As described herein, a victim UE 115 may be configured to detect and measure CLI from one or more neighboring aggressor UEs 115, and the victim UE 115 may select an aggressor UE 115 for sidelink communications based on the CLI measurements. In some cases, the victim UE 115 may be connected to a first aggressor UE 115, and the victim UE 115 may determine to switch the sidelink connection based on one or more channel triggering events, thereby using fewer resources to maintain and improve sidelink communications and connect to the network.

FIG. 4 illustrates an example of a CLI measurement curve 400 that supports interference measurements for sidelink communications in accordance with one or more aspects of the present disclosure. In some examples, CLI measurement curve 400 may implement aspects of

wireless communications systems

100, 200, or 300.

The CLI measurement curve 400 may include plots of CLI measurements 405-a and 405-b over time, which may be examples of CLI measured by a victim UE 115 from a first aggressor UE 115 and a second aggressor UE 115, respectively, as described with reference to FIGs. 2 and 3. The CLI measurement curve 400 may include CLI offsets 410-a and 410-b and corresponding plots of CLI measurements with offset 415-a and 415-b over time. In some examples, a victim UE 115 may use the CLI measurements 405 and associated CLI parameters shown by the CLI measurement curve 400 for selecting an aggressor UE 115 for sidelink communications, determining to switch sidelink connections, or both, as described herein and with reference to FIGs. 2 and 3.

The CLI measurement curve 400 may be an example of a channel triggering event as described with reference to FIG. 3. For example, CLI measurement 405-a may correspond to CLI received and measured by a victim UE 115 from a first aggressor UE 115, and CLI measurement 405-b may correspond to CLI received and measured by the victim UE 115 from a second aggressor UE 115. The CLI measurement curve 400 may illustrate an example of CLI measurements 405 that may result in a victim UE 115 entering a triggering condition.

In the example of FIG. 4, the UE 115 measuring the CLI from the aggressor UEs 115 may not be connected with the first aggressor UE 115 or the second aggressor UE 115 via a sidelink connection, and the victim UE 115 may be measuring the CLI from the two aggressor UEs 115 in order to select an aggressor UE 115 for sidelink communications or to determine a CLI measurement 405. In one example, the victim UE 115 may determine that CLI measurement 405-a is the CLI measurement 405 (e.g., because the curve associated with CLI measurement 405-a may be greater than the curve associated with CLI measurement 405-b at the beginning of the CLI measurement curve 400) . For example, the victim UE 115 may maintain a history of CLI measurements 405 from one or more nearby aggressor UEs 115, and CLI measurement 405-a may be the strongest. As such, the victim UE 115 may attempt to establish a sidelink connection with the first aggressor UE associated with CLI measurement 405-a unless the victim UE 115 identifies a channel triggering event, as described with reference to FIG. 3. In the example shown by the CLI measurement curve 400, the current CLI measurement 405-a may decrease over time and CLI measurement 405-b may increase over time (e.g., the first aggressor UE 115 may move away from the victim UE 115, and the second aggressor UE 115 may move closer to the victim UE 115) .

The victim UE 115 may determine that a channel triggering event may occur based on the values of the CLI measurements 405 and one or more additional CLI measuring parameters such as the offsets 410 and the CLI trigger period 420. For example, the victim UE 115 may apply offsets 410-a and 410-b to CLI measurements 405-a and 405-b, respectively, as a buffer for comparing the CLI measurements 405. By comparing CLI measurements with offsets 415-a and 415-b, the victim UE 115 may determine that one of the CLI measurements 405 is greater than the other by at least a threshold, and the victim UE 115 may account for delays associated with the measurements (e.g., the offsets 410 may account for hysteresis for entering the triggering event) . For example, the victim UE 115 may apply offset 410-a to CLI measurement 405-a over time, and the victim UE 115 may treat the CLI measurement with offset 415-a as the value of the measured CLI from the first aggressor UE 115. Additionally or alternatively, the victim UE 115 may decrease the CLI measurement 405-b by offset 410-b, to equal CLI measurement with offset 415-b. As such, the victim UE 115 may not determine that a channel triggering event has started at the time when CLI measurement 405-b is greater than the CLI measurement 405-a. Instead, the victim UE 115 may determine that a channel triggering event has started when the CLI measurement with offset 415-b is greater than the CLI measurement with offset 415-a. The offsets 410 may thereby provide a buffer for the victim UE 115 to determine a consistency and validity of each of the respective CLI measurements 405.

If the victim UE 115 determines that a channel triggering event has started, the victim UE 115 may start a pre-configured CLI timer with a duration equal to the CLI trigger period 420. The victim UE 115 may determine that a channel triggering event has occurred if the CLI measurement with offset 415-b is greater than the CLI measurement with offset 415-a after the CLI trigger period 420. The victim UE 115 may then identify the second aggressor UE 115 associated with CLI measurement 405-b as the current UE 115 (e.g., the first aggressor UE 115 may no longer be considered the UE 115) , and the victim UE 115 may attempt to establish a sidelink connection with the second aggressor UE 115.

As described herein, the CLI measurement curve 400 may be an example of CLI measurements 405 over time that may result in a CLI triggering event (e.g., an event that may trigger the CLI measuring UE 115 to identify a CLI measurement 405 or to establish a sidelink connection with an aggressor UE 115 based on the CLI measurements 405) . It is understood that the measurements and events described by the CLI measurement curve 400 may assume values and occur in orders that are not illustrated. For instance, CLI measurement 405-a may remain greater than CLI measurement 405-b over time, or vice versa. As another example, the CLI offsets 410 may assume different values, and the CLI trigger period 420 may be different lengths, or may not be used for CLI measurements.

FIG. 5 illustrates an example of a process flow 500 that supports interference measurements for sidelink communications in accordance with one or more aspects of the present disclosure. In some examples, process flow 500 may implement aspects of

wireless communications systems

100, 200, or 300. Process flow 500 illustrates communications between a UE 115-i, a UE 115-h, and a UE 115-j, which may be examples of UEs 115 as described with reference to FIG. 1. It is understood that the devices and nodes described by the process flow 500 may communicate with or be coupled with other devices or nodes that are not illustrated. For instance, UE 115-h may communicate with and measure CLI from UEs 115-i and 115-j or one or more other UEs 115. Alternative examples of the following may be implemented, where some steps are performed in a different order than described or are not performed at all. In some cases, a step may include additional features not mentioned below, or further steps may be added.

At 505, in some cases, UE 115-h may establish a sidelink communications link with another UE 115, such as UE 115-j. In some cases, the sidelink communications link may be established by UE 115-h, UE 115-j, or some other network entity.

At 510, UE 115-h may receive a configuration indicating a set of measurement resources designated for performing interference measurements by UE 115-h. UE 115-h may receive the CLI measurement resource configuration from a base station 105, or from another UE 115, such as UE 115-i or UE 115-j. The CLI measurement resource configuration may indicate a set of measurement resources for performing CLI measurements.

At 515, UE 115-h may measure interference from one or more candidate UEs 115 over the set of measurement resources indicated by the CLI measurement resource configuration. For example, UE 115-h may receive and measure CLI from UE 115-i and UE 115-j. In some examples, UE 115-h may receive and measure CLI from one or more additional UEs 115.

At 520, in some cases, UE 115-h may determine that a measured interference exceeds a threshold. For example, in some cases, UE 115-h may determine that the CLI measured from UE 115-i exceeds a preconfigured CLI threshold. Additionally or alternatively, UE 115-h may determine that the CLI from UE 115-i exceeds a CLI measurement associated with a previously measured UE 115, such as UE 115-j, by a threshold. In some examples, UE 115-h may refrain from measuring interference from the one or more candidate UEs 115 based on determining that the measured interference associated with target UE 115-i exceeds the threshold.

At 525, UE 115-h may select a target UE 115 from the one or more candidate UEs 115 for a sidelink connection based on the measured interference from the candidate UEs 115. For example, UE 115-h may select UE 115-i as a target UE 115 based on the CLI from UE 115-i exceeding a preconfigured threshold.

At 530, in some cases, UE 115-h may disconnect from the sidelink connection with UE 115-j. UE 115-h may disconnect from the sidelink communications link with UE 115-j based on selecting UE 115-i. In some examples, UE 115-j may receive a measurement report from UE 115-h indicating that a CLI measurement from UE 115-i is stronger than the CLI measured from UE 115-j, and UE 115-j may transmit a sidelink connection release message to UE 115-h to release the sidelink communications link.

At 535, UE 115-h may establish a sidelink communications link with UE 115-i based on selecting UE 115-i as the target UE 115.

At 540, UE 115-h may measure interference from one or more other UEs 115. For example, UE 115-h may measure CLI from UE 115-i, UE 115-j or one or more other UEs 115. In some examples, UE 115-h may determine that the CLI from UE 115-j exceeds the CLI from UE 115-i by a threshold.

At 545, UE 115-i may receive a report from UE 115-h indicating that a measured interference associated with a third UE 115, such as UE 115-j, exceeds an interference measurement associated with UE 115-i by a threshold. For example, UE 115-j may have moved closer to UE 115-h than UE 115-i, and the CLI from UE 115-j may be stronger than the CLI from UE 115-i.

At 550, UE 115-i may transmit a sidelink connection release message to UE 115-h in response to the CLI measurement report received at 545. The sidelink connection release message may instruct UE 115-h to disconnect the sidelink communications link.

At 555, In some examples, UE 115-h may establish the communications link with UE 115-j based on the disconnection of the sidelink communications link with UE 115-i and the measured CLI from UE 115-j being stronger than the CLI from UE 115-i by a threshold.

FIG. 6 shows a block diagram 600 of a device 605 that supports interference measurements for sidelink communications in accordance with one or more aspects of the present disclosure. The device 605 may be an example of aspects of a UE 115 as described herein. The device 605 may include a receiver 610, a communications manager 615, and a transmitter 620. The device 605 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .

The receiver 610 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to interference measurements for sidelink communications, etc. ) . Information may be passed on to other components of the device 605. The receiver 610 may be an example of aspects of the transceiver 920 described with reference to FIG. 9. The receiver 610 may utilize a single antenna or a set of antennas.

The communications manager 615 may receive a configuration indicating a set of measurement resources designated for performing interference measurements by the UE, measure interference from one or more candidate UEs over the set of measurement resources, select a target UE from the one or more candidate UEs for a sidelink connection with the UE based on the measured interference from the one or more candidate UEs, and establish a sidelink communications link with the target UE based on selecting the target UE. The communications manager 615 may also establish a sidelink communications link with a second UE, receive, from the second UE, a report indicating that a measured interference associated with a third UE exceeds an interference measurement associated with the first UE by a threshold, and transmit, to the second UE, a sidelink connection release message in response to the report, the sidelink connection release message instructing the second UE to disconnect the sidelink communications link. The communications manager 615 may be an example of aspects of the communications manager 910 described herein.

The communications manager 615, or its sub-components, may be implemented in hardware, code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communications manager 615, or its sub-components may be executed by a general-purpose processor, digital signal processor (DSP) , an application-specific integrated circuit (ASIC) , a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

The communications manager 615, or its sub-components, may be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations by one or more physical components. In some examples, the communications manager 615, or its sub-components, may be a separate and distinct component in accordance with various aspects of the present disclosure. In some examples, the communications manager 615, or its sub-components, may be combined with one or more other hardware components, including but not limited to an input/output (I/O) component, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof in accordance with various aspects of the present disclosure.

The transmitter 620 may transmit signals generated by other components of the device 605. In some examples, the transmitter 620 may be collocated with a receiver 610 in a transceiver module. For example, the transmitter 620 may be an example of aspects of the transceiver 920 described with reference to FIG. 9. The transmitter 620 may utilize a single antenna or a set of antennas.

The communications manager 615 may be an example of means for performing various aspects of interference measurements for sidelink communications as described herein. The communications manager 615, or its sub-components, may be implemented in hardware (e.g., in communications management circuitry) . The circuitry may comprise of processor, a DSP, an ASIC, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

In another implementation, the communications manager 615, or its sub-components, may be implemented in code (e.g., as communications management software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communications manager 615, or its sub-components may be executed by a general-purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device.

In some examples, the communication manager 515 may be configured to perform various operations (e.g., receiving, determining, transmitting) using or otherwise in cooperation with the receiver 510, the transmitter 520, or both.

The communications manager 615 as described herein may be implemented to realize one or more potential advantages. One implementation may allow the device 605 to establish sidelink connections using fewer resources by selecting a target device for sidelink communications based on one or more CLI measurements at the device 605. For example, the device 605 (e.g., a victim UE 115) may be configured to measure CLI from one or more neighboring UEs 115. By using the configured CLI measurement resources, the device 605 may refrain from using other resources for selecting a sidelink connection. As such, the device 605 may reduce overhead associated with the communications.

Additionally or alternatively, the device 605 may establish more stable sidelink connections by using the one or more CLI measurements to determine an associated sidelink channel quality. For example, the device 605 may determine that a current sidelink connection is poor based on a low CLI measurement, and the device 605 may establish a second sidelink connection based on a high CLI measurement associated with the second sidelink connection (e.g., with a target device) . As such, the device 605 may reduce latency associated with communications, and may thereby improve user experience.

FIG. 7 shows a block diagram 700 of a device 705 that supports interference measurements for sidelink communications in accordance with one or more aspects of the present disclosure. The device 705 may be an example of aspects of a device 605, or a UE 115 as described herein. The device 705 may include a receiver 710, a communications manager 715, and a transmitter 755. The device 705 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .

The receiver 710 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to interference measurements for sidelink communications, etc. ) . Information may be passed on to other components of the device 705. The receiver 710 may be an example of aspects of the transceiver 920 described with reference to FIG. 9. The receiver 710 may utilize a single antenna or a set of antennas.

The communications manager 715 may be an example of aspects of the communications manager 615 as described herein. The communications manager 715 may include a configuration receiver 720, a measurement manager 725, a target selection manager 730, a sidelink communications component 735, a sidelink manager 740, a report receiver 745, and a release message transmitter 750. The communications manager 715 may be an example of aspects of the communications manager 910 described herein.

The configuration receiver 720 may receive a configuration indicating a set of measurement resources designated for performing interference measurements by the UE.

The measurement manager 725 may measure interference from one or more candidate UEs over the set of measurement resources.

The target selection manager 730 may select a target UE from the one or more candidate UEs for a sidelink connection with the UE based on the measured interference from the one or more candidate UEs.

The sidelink communications component 735 may establish a sidelink communications link with the target UE based on selecting the target UE.

The sidelink manager 740 may establish a sidelink communications link with a second UE.

The report receiver 745 may receive, from the second UE, a report indicating that a measured interference associated with a third UE exceeds an interference measurement associated with the first UE by a threshold.

The release message transmitter 750 may transmit, to the second UE, a sidelink connection release message in response to the report, the sidelink connection release message instructing the second UE to disconnect the sidelink communications link.

The transmitter 755 may transmit signals generated by other components of the device 705. In some examples, the transmitter 755 may be collocated with a receiver 710 in a transceiver module. For example, the transmitter 755 may be an example of aspects of the transceiver 920 described with reference to FIG. 9. The transmitter 755 may utilize a single antenna or a set of antennas.

FIG. 8 shows a block diagram 800 of a communications manager 805 that supports interference measurements for sidelink communications in accordance with one or more aspects of the present disclosure. The communications manager 805 may be an example of aspects of a communications manager 615, a communications manager 715, or a communications manager 910 described herein. The communications manager 805 may include a configuration receiver 810, a measurement manager 815, a target selection manager 820, a sidelink communications component 825, a measurement threshold component 830, a report transmitter 835, a release message receiver 840, a sidelink manager 845, a report receiver 850, a release message transmitter 855, and a delay manager 860. Each of these modules may communicate, directly or indirectly, with one another (e.g., via one or more buses) .

The configuration receiver 810 may receive a configuration indicating a set of measurement resources designated for performing interference measurements by the UE.

In some examples, the configuration receiver 810 may receive the configuration from a base station or a sidelink UE connected to the UE, the sidelink UE different from the target UE.

In some examples, the configuration receiver 810 may receive an indication of a measurement threshold, a set of hysteresis values, one or more measurement offsets, a time to trigger duration, or any combination thereof, where the target UE is selected based on the measurement threshold, the set of hysteresis values, the one or more measurement offsets, the time to trigger duration, or any combination thereof.

The measurement manager 815 may measure interference from one or more candidate UEs over the set of measurement resources.

In some examples, the measurement manager 815 may refrain from measuring interference from the one or more candidate UEs other than the target UE over a subsequent set of measurement resources based on determining that the measured interference associated with the target UE exceeds the threshold.

In some examples, the measurement manager 815 may initiate the measuring of the interference from the one or more candidate UEs over the set of measurement resources after determining that the measured interference associated with the sidelink UE is below the threshold.

In some examples, the measurement manager 815 may measure interference from a second UE over a subsequent set of measurement resources after measuring interference from one or more candidate UEs over the set of measurement resources, where the one or more candidate UEs excludes the second UE.

In some examples, the measurement manager 815 may determine that a measured interference associated with the target UE exceeds a threshold based on the measuring.

The target selection manager 820 may select a target UE from the one or more candidate UEs for a sidelink connection with the UE based on the measured interference from the one or more candidate UEs.

In some examples, the target selection manager 820 may select the target UE for the sidelink connection with the UE based on the measured interference exceeding the threshold and the interference measurement associated with the previously measured UE being below a second threshold.

The sidelink communications component 825 may establish a sidelink communications link with the target UE based on selecting the target UE.

In some examples, the sidelink communications component 825 may establish an initial sidelink connection with the previously measured UE before determining that the measured interference associated with the target UE exceeds the interference measurement associated with the previously measured UE by the threshold.

In some examples, the sidelink communications component 825 may disconnect from the previously measured UE based on determining that the measured interference associated with the target UE exceeds the interference measurement associated with the previously measured UE by the threshold.

In some examples, the sidelink communications component 825 may establish the sidelink communications link with the target UE based on disconnecting from the previously measured UE.

In some examples, the sidelink communications component 825 may establish a second sidelink communications link with the second UE based on determining that the measured interference associated with the second UE exceeds the threshold.

The sidelink manager 845 may establish a sidelink communications link with a second UE.

The report receiver 850 may receive, from the second UE, a report indicating that a measured interference associated with a third UE exceeds an interference measurement associated with the first UE by a threshold.

The release message transmitter 855 may transmit, to the second UE, a sidelink connection release message in response to the report, the sidelink connection release message instructing the second UE to disconnect the sidelink communications link.

In some examples, the release message transmitter 855 may transmit an indication to delay disconnection of the sidelink communications link for a time period.

In some cases, the time period corresponds to a timing for completion of an ongoing communication via the sidelink communications link.

The measurement threshold component 830 may determine that a measured interference associated with the target UE exceeds a threshold based on the measuring, where the target UE is selected based on the measured interference exceeding the threshold.

In some examples, the measurement threshold component 830 may determine that a measured interference associated with a sidelink UE connected to the UE is below a threshold based on the measuring.

In some examples, the measurement threshold component 830 may determine that a measured interference associated with the target UE exceeds an interference measurement associated with a previously measured UE by a threshold, where the target UE is selected based on the measured interference exceeding the interference measurement by the threshold.

In some examples, the measurement threshold component 830 may determine that a measured interference associated with the second UE exceeds a threshold based on measuring interference from the second UE over the subsequent set of measurement resources.

In some examples, the measurement threshold component 830 may determine that an interference measurement associated with a previously measured UE is below a threshold based on the measuring.

The report transmitter 835 may transmit, to the previously measured UE, a report indicating that the measured interference associated with the target UE exceeds the interference measurement associated with the previously measured UE by the threshold.

In some examples, the report transmitter 835 may transmit, to a base station serving the UE, a report indicating that the measured interference associated with the target UE exceeds the interference measurement associated with the previously measured UE by the threshold.

The release message receiver 840 may receive a sidelink connection release message from the previously measured UE in response to the report.

The delay manager 860 may delay transmission of the sidelink connection release message until completion of an ongoing communication via the sidelink communications link.

FIG. 9 shows a diagram of a system 900 including a device 905 that supports interference measurements for sidelink communications in accordance with one or more aspects of the present disclosure. The device 905 may be an example of or include the components of device 605, device 705, or a UE 115 as described herein. The device 905 may include components for bi-directional voice and data communications including components for transmitting and receiving communications, including a communications manager 910, an I/O controller 915, a transceiver 920, an antenna 925, memory 930, and a processor 940. These components may be in electronic communication via one or more buses (e.g., bus 945) .

The communications manager 910 may receive a configuration indicating a set of measurement resources designated for performing interference measurements by the UE, measure interference from one or more candidate UEs over the set of measurement resources, select a target UE from the one or more candidate UEs for a sidelink connection with the UE based on the measured interference from the one or more candidate UEs, and establish a sidelink communications link with the target UE based on selecting the target UE. The communications manager 910 may also establish a sidelink communications link with a second UE, receive, from the second UE, a report indicating that a measured interference associated with a third UE exceeds an interference measurement associated with the first UE by a threshold, and transmit, to the second UE, a sidelink connection release message in response to the report, the sidelink connection release message instructing the second UE to disconnect the sidelink communications link.

The I/O controller 915 may manage input and output signals for the device 905. The I/O controller 915 may also manage peripherals not integrated into the device 905. In some cases, the I/O controller 915 may represent a physical connection or port to an external peripheral. In some cases, the I/O controller 915 may utilize an operating system such as

or another known operating system. In other cases, the I/O controller 915 may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device. In some cases, the I/O controller 915 may be implemented as part of a processor. In some cases, a user may interact with the device 905 via the I/O controller 915 or via hardware components controlled by the I/O controller 915.

The transceiver 920 may communicate bi-directionally, via one or more antennas, wired, or wireless links as described above. For example, the transceiver 920 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 920 may also include a modem to modulate the packets and provide the modulated packets to the antennas for transmission, and to demodulate packets received from the antennas.

In some cases, the wireless device may include a single antenna 925. However, in some cases the device may have more than one antenna 925, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.

The memory 930 may include random-access memory (RAM) and read-only memory (ROM) . The memory 930 may store computer-readable, computer-executable code 935 including instructions that, when executed, cause the processor to perform various functions described herein. In some cases, the memory 930 may contain, among other things, a basic I/O system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices.

The processor 940 may include an intelligent hardware device, (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) . In some cases, the processor 940 may be configured to operate a memory array using a memory controller. In other cases, a memory controller may be integrated into the processor 940. The processor 940 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 930) to cause the device 905 to perform various functions (e.g., functions or tasks supporting interference measurements for sidelink communications) .

The code 935 may include instructions to implement aspects of the present disclosure, including instructions to support wireless communications. The code 935 may be stored in a non-transitory computer-readable medium such as system memory or other type of memory. In some cases, the code 935 may not be directly executable by the processor 940 but may cause a computer (e.g., when compiled and executed) to perform functions described herein.

FIG. 10 shows a flowchart illustrating a method 1000 that supports interference measurements for sidelink communications in accordance with one or more aspects of the present disclosure. The operations of method 1000 may be implemented by a UE 115 or its components as described herein. For example, the operations of method 1000 may be performed by a communications manager as described with reference to FIGs. 6 through 9. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.

At 1005, the UE may receive a configuration indicating a set of measurement resources designated for performing interference measurements by the UE. The operations of 1005 may be performed according to the methods described herein. In some examples, aspects of the operations of 1005 may be performed by a configuration receiver as described with reference to FIGs. 6 through 9.

At 1010, the UE may measure interference from one or more candidate UEs over the set of measurement resources. The operations of 1010 may be performed according to the methods described herein. In some examples, aspects of the operations of 1010 may be performed by a measurement manager as described with reference to FIGs. 6 through 9.

At 1015, the UE may select a target UE from the one or more candidate UEs for a sidelink connection with the UE based on the measured interference from the one or more candidate UEs. The operations of 1015 may be performed according to the methods described herein. In some examples, aspects of the operations of 1015 may be performed by a target selection manager as described with reference to FIGs. 6 through 9.

At 1020, the UE may establish a sidelink communications link with the target UE based on selecting the target UE. The operations of 1020 may be performed according to the methods described herein. In some examples, aspects of the operations of 1020 may be performed by a sidelink communications component as described with reference to FIGs. 6 through 9.

FIG. 11 shows a flowchart illustrating a method 1100 that supports interference measurements for sidelink communications in accordance with one or more aspects of the present disclosure. The operations of method 1100 may be implemented by a UE 115 or its components as described herein. For example, the operations of method 1100 may be performed by a communications manager as described with reference to FIGs. 6 through 9. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.

At 1105, the UE may receive a configuration indicating a set of measurement resources designated for performing interference measurements by the UE. The operations of 1105 may be performed according to the methods described herein. In some examples, aspects of the operations of 1105 may be performed by a configuration receiver as described with reference to FIGs. 6 through 9.

At 1110, the UE may measure interference from one or more candidate UEs over the set of measurement resources. The operations of 1110 may be performed according to the methods described herein. In some examples, aspects of the operations of 1110 may be performed by a measurement manager as described with reference to FIGs. 6 through 9.

At 1115, the UE may determine that a measured interference associated with the target UE exceeds a threshold based on the measuring. The operations of 1115 may be performed according to the methods described herein. In some examples, aspects of the operations of 1115 may be performed by a measurement threshold component as described with reference to FIGs. 6 through 9.

At 1120, the UE may select a target UE from the one or more candidate UEs for a sidelink connection with the UE based on the measured interference from the one or more candidate UEs, where the target UE is selected based on the measured interference exceeding the threshold. The operations of 1120 may be performed according to the methods described herein. In some examples, aspects of the operations of 1120 may be performed by a target selection manager as described with reference to FIGs. 6 through 9.

At 1125, the UE may establish a sidelink communications link with the target UE based on selecting the target UE. The operations of 1125 may be performed according to the methods described herein. In some examples, aspects of the operations of 1125 may be performed by a sidelink communications component as described with reference to FIGs. 6 through 9.

FIG. 12 shows a flowchart illustrating a method 1200 that supports interference measurements for sidelink communications in accordance with one or more aspects of the present disclosure. The operations of method 1200 may be implemented by a UE 115 or its components as described herein. For example, the operations of method 1200 may be performed by a communications manager as described with reference to FIGs. 6 through 9. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.

At 1205, the UE may receive a configuration indicating a set of measurement resources designated for performing interference measurements by the UE. The operations of 1205 may be performed according to the methods described herein. In some examples, aspects of the operations of 1205 may be performed by a configuration receiver as described with reference to FIGs. 6 through 9.

At 1210, the UE may determine that a measured interference associated with a sidelink UE connected to the UE is below a threshold based on the measuring. The operations of 1210 may be performed according to the methods described herein. In some examples, aspects of the operations of 1210 may be performed by a measurement threshold component as described with reference to FIGs. 6 through 9.

At 1215, the UE may initiate the measuring of the interference from the one or more candidate UEs over the set of measurement resources after determining that the measured interference associated with the sidelink UE is below the threshold. The operations of 1215 may be performed according to the methods described herein. In some examples, aspects of the operations of 1215 may be performed by a measurement manager as described with reference to FIGs. 6 through 9.

At 1220, the UE may measure interference from one or more candidate UEs over the set of measurement resources. The operations of 1220 may be performed according to the methods described herein. In some examples, aspects of the operations of 1220 may be performed by a measurement manager as described with reference to FIGs. 6 through 9.

At 1225, the UE may select a target UE from the one or more candidate UEs for a sidelink connection with the UE based on the measured interference from the one or more candidate UEs. The operations of 1225 may be performed according to the methods described herein. In some examples, aspects of the operations of 1225 may be performed by a target selection manager as described with reference to FIGs. 6 through 9.

At 1230, the UE may establish a sidelink communications link with the target UE based on selecting the target UE. The operations of 1230 may be performed according to the methods described herein. In some examples, aspects of the operations of 1230 may be performed by a sidelink communications component as described with reference to FIGs. 6 through 9.

FIG. 13 shows a flowchart illustrating a method 1300 that supports interference measurements for sidelink communications in accordance with one or more aspects of the present disclosure. The operations of method 1300 may be implemented by a UE 115 or its components as described herein. For example, the operations of method 1300 may be performed by a communications manager as described with reference to FIGs. 6 through 9. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.

At 1305, the UE may receive a configuration indicating a set of measurement resources designated for performing interference measurements by the UE. The operations of 1305 may be performed according to the methods described herein. In some examples, aspects of the operations of 1305 may be performed by a configuration receiver as described with reference to FIGs. 6 through 9.

At 1310, the UE may measure interference from one or more candidate UEs over the set of measurement resources. The operations of 1310 may be performed according to the methods described herein. In some examples, aspects of the operations of 1310 may be performed by a measurement manager as described with reference to FIGs. 6 through 9.

At 1315, the UE may determine that a measured interference associated with the target UE exceeds an interference measurement associated with a previously measured UE by a threshold. The operations of 1315 may be performed according to the methods described herein. In some examples, aspects of the operations of 1315 may be performed by a measurement threshold component as described with reference to FIGs. 6 through 9.

At 1320, the UE may select a target UE from the one or more candidate UEs for a sidelink connection with the UE based on the measured interference from the one or more candidate UEs, where the target UE is selected based on the measured interference exceeding the interference measurement by the threshold. The operations of 1320 may be performed according to the methods described herein. In some examples, aspects of the operations of 1320 may be performed by a target selection manager as described with reference to FIGs. 6 through 9.

At 1325, the UE may establish a sidelink communications link with the target UE based on selecting the target UE. The operations of 1325 may be performed according to the methods described herein. In some examples, aspects of the operations of 1325 may be performed by a sidelink communications component as described with reference to FIGs. 6 through 9.

FIG. 14 shows a flowchart illustrating a method 1400 that supports interference measurements for sidelink communications in accordance with one or more aspects of the present disclosure. The operations of method 1400 may be implemented by a UE 115 or its components as described herein. For example, the operations of method 1400 may be performed by a communications manager as described with reference to FIGs. 6 through 9. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.

At 1405, the UE may establish a sidelink communications link with a second UE. The operations of 1405 may be performed according to the methods described herein. In some examples, aspects of the operations of 1405 may be performed by a sidelink manager as described with reference to FIGs. 6 through 9.

At 1410, the UE may receive, from the second UE, a report indicating that a measured interference associated with a third UE exceeds an interference measurement associated with the first UE by a threshold. The operations of 1410 may be performed according to the methods described herein. In some examples, aspects of the operations of 1410 may be performed by a report receiver as described with reference to FIGs. 6 through 9.

At 1415, the UE may transmit, to the second UE, a sidelink connection release message in response to the report, the sidelink connection release message instructing the second UE to disconnect the sidelink communications link. The operations of 1415 may be performed according to the methods described herein. In some examples, aspects of the operations of 1415 may be performed by a release message transmitter as described with reference to FIGs. 6 through 9.

FIG. 15 shows a flowchart illustrating a method 1500 that supports interference measurements for sidelink communications in accordance with one or more aspects of the present disclosure. The operations of method 1500 may be implemented by a UE 115 or its components as described herein. For example, the operations of method 1500 may be performed by a communications manager as described with reference to FIGs. 6 through 9. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.

At 1505, the UE may establish a sidelink communications link with a second UE. The operations of 1505 may be performed according to the methods described herein. In some examples, aspects of the operations of 1505 may be performed by a sidelink manager as described with reference to FIGs. 6 through 9.

At 1510, the UE may receive, from the second UE, a report indicating that a measured interference associated with a third UE exceeds an interference measurement associated with the first UE by a threshold. The operations of 1510 may be performed according to the methods described herein. In some examples, aspects of the operations of 1510 may be performed by a report receiver as described with reference to FIGs. 6 through 9.

At 1515, the UE may transmit an indication to delay disconnection of the sidelink communications link for a time period. The operations of 1515 may be performed according to the methods described herein. In some examples, aspects of the operations of 1515 may be performed by a release message transmitter as described with reference to FIGs. 6 through 9.

At 1520, the UE may transmit, to the second UE, a sidelink connection release message in response to the report, the sidelink connection release message instructing the second UE to disconnect the sidelink communications link. The operations of 1520 may be performed according to the methods described herein. In some examples, aspects of the operations of 1520 may be performed by a release message transmitter as described with reference to FIGs. 6 through 9.

FIG. 16 shows a flowchart illustrating a method 1600 that supports interference measurements for sidelink communications in accordance with one or more aspects of the present disclosure. The operations of method 1600 may be implemented by a UE 115 or its components as described herein. For example, the operations of method 1600 may be performed by a communications manager as described with reference to FIGs. 6 through 9. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.

At 1605, the UE may establish a sidelink communications link with a second UE. The operations of 1605 may be performed according to the methods described herein. In some examples, aspects of the operations of 1605 may be performed by a sidelink manager as described with reference to FIGs. 6 through 9.

At 1610, the UE may receive, from the second UE, a report indicating that a measured interference associated with a third UE exceeds an interference measurement associated with the first UE by a threshold. The operations of 1610 may be performed according to the methods described herein. In some examples, aspects of the operations of 1610 may be performed by a report receiver as described with reference to FIGs. 6 through 9.

At 1615, the UE may delay transmission of the sidelink connection release message until completion of an ongoing communication via the sidelink communications link. The operations of 1615 may be performed according to the methods described herein. In some examples, aspects of the operations of 1615 may be performed by a delay manager as described with reference to FIGs. 6 through 9.

At 1620, the UE may transmit, to the second UE, a sidelink connection release message in response to the report, the sidelink connection release message instructing the second UE to disconnect the sidelink communications link. The operations of 1620 may be performed according to the methods described herein. In some examples, aspects of the operations of 1620 may be performed by a release message transmitter as described with reference to FIGs. 6 through 9.

It should be noted that the methods described herein describe possible implementations, and that the operations and the steps may be rearranged or otherwise modified and that other implementations are possible. Further, aspects from two or more of the methods may be combined.

The following provides an overview of examples of the present disclosure:

Example 1: A method for wireless communications at a UE, comprising receiving a configuration indicating a set of measurement resources designated for performing interference measurements by the UE; measuring interference from one or more candidate UEs over the set of measurement resources; selecting a target UE from the one or more candidate UEs for a sidelink connection with the UE based at least in part on the measured interference from the one or more candidate UEs; and establishing a sidelink communications link with the target UE based at least in part on selecting the target UE.

Example 2: The method of example 1, further comprising: determining that a measured interference associated with the target UE exceeds a threshold based at least in part on the measuring, wherein the target UE is selected based at least in part on the measured interference exceeding the threshold.

Example 3: The method of any one of examples 1 and 2, further comprising: refraining from measuring interference from the one or more candidate UEs other than the target UE over a subsequent set of measurement resources based at least in part on determining that the measured interference associated with the target UE exceeds the threshold.

Example 4: The method of example 1, further comprising determining that a measured interference associated with a sidelink UE connected to the UE is below a threshold based at least in part on the measuring; and initiating the measuring of the interference from the one or more candidate UEs over the set of measurement resources after determining that the measured interference associated with the sidelink UE is below the threshold.

Example 5: The method of example 1, further comprising: determining that a measured interference associated with the target UE exceeds an interference measurement associated with a previously measured UE by a threshold, wherein the target UE is selected based at least in part on the measured interference exceeding the interference measurement by the threshold.

Example 6: The method of any one of examples 1 and 5, further comprising: establishing an initial sidelink connection with the previously measured UE before determining that the measured interference associated with the target UE exceeds the interference measurement associated with the previously measured UE by the threshold.

Example 7: The method of any one of examples 1, 5, and 6, further comprising: disconnecting from the previously measured UE based at least in part on determining that the measured interference associated with the target UE exceeds the interference measurement associated with the previously measured UE by the threshold.

Example 8: The method of any one of examples 1 and 5 through 7, wherein establishing the sidelink communications link comprises: establishing the sidelink communications link with the target UE based at least in part on disconnecting from the previously measured UE.

Example 9: The method of any one of examples 1 and 5 through 8, further comprising: transmitting, to the previously measured UE, a report indicating that the measured interference associated with the target UE exceeds the interference measurement associated with the previously measured UE by the threshold.

Example 10: The method of any one of examples 1 and 5 through 9, further comprising: receiving a sidelink connection release message from the previously measured UE in response to the report.

Example 11: The method of any one of examples 1 and 5 through 10, further comprising: transmitting, to a base station serving the UE, a report indicating that the measured interference associated with the target UE exceeds the interference measurement associated with the previously measured UE by the threshold.

Example 12: The method of any one of examples 1 through 3, further comprising: measuring interference from a second UE over a subsequent set of measurement resources after measuring interference from one or more candidate UEs over the set of measurement resources, wherein the one or more candidate UEs excludes the second UE; determining that a measured interference associated with the second UE exceeds a threshold based at least in part on measuring interference from the second UE over the subsequent set of measurement resources; and establishing a second sidelink communications link with the second UE based at least in part on determining that the measured interference associated with the second UE exceeds the threshold.

Example 13: The method of any one of examples 1 through 3 and 12, further comprising: determining that a measured interference associated with the target UE exceeds a threshold based at least in part on the measuring; determining that an interference measurement associated with a previously measured UE is below a threshold based at least in part on the measuring; and selecting the target UE for the sidelink connection with the UE based at least in part on the measured interference exceeding the threshold and the interference measurement associated with the previously measured UE being below a second threshold

Example 14: The method of example 1, wherein receiving the configuration comprises: receiving the configuration from a base station or a sidelink UE connected to the UE, the sidelink UE different from the target UE.

Example 15: The method of any one of examples 1 and 14, wherein receiving the configuration comprises: receiving an indication of a measurement threshold, a set of hysteresis values, one or more measurement offsets, a time to trigger duration, or any combination thereof, wherein the target UE is selected based at least in part on the measurement threshold, the set of hysteresis values, the one or more measurement offsets, the time to trigger duration, or any combination thereof.

Example 16: A method for wireless communications at a first user equipment (UE) , comprising: establishing a sidelink communications link with a second UE; receiving, from the second UE, a report indicating that a measured interference associated with a third UE exceeds an interference measurement associated with the first UE by a threshold; and transmitting, to the second UE, a sidelink connection release message in response to the report, the sidelink connection release message instructing the second UE to disconnect the sidelink communications link.

Example 17: The method of example 16, wherein transmitting the sidelink connection release message comprises: transmitting an indication to delay disconnection of the sidelink communications link for a time period.

Example 18: The method of any one of examples 16 and 17, wherein the time period corresponds to a timing for completion of an ongoing communication via the sidelink communications link.

Example 19: The method of any one of examples 16 through 18, further comprising: delaying transmission of the sidelink connection release message until completion of an ongoing communication via the sidelink communications link.

Example 20: An apparatus for wireless communication comprising at least one means for performing a method of any one of examples 1 through 15.

Example 21: An apparatus for wireless communication comprising a processor and memory coupled to the processor, the processor and memory configured to perform a method of any one of examples 1 through 15.

Example 22: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform a method of any one of examples 1 through 15.

Example 23: An apparatus for wireless communication comprising at least one means for performing a method of any one of examples 16 through 19.

Example 24: An apparatus for wireless communication comprising a processor and memory coupled to the processor, the processor and memory configured to perform a method of any one of examples 16 through 19.

Example 25: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform a method of any one of examples 16 through 19.

Although aspects of an LTE, LTE-A, LTE-A Pro, or NR system may be described for purposes of example, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques may be applicable to various other wireless communications systems such as Ultra Mobile Broadband (UMB) , Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20, Flash-OFDM, as well as other systems and radio technologies not explicitly mentioned herein.

Information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

The various illustrative blocks and components described in connection with the disclosure herein may be implemented or performed with a general-purpose processor, a DSP, an ASIC, a CPU, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration) .

The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.

Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special purpose computer. By way of example, and not limitation, non-transitory computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM) , flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) , or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of computer-readable medium. Disk and disc, as used herein, include CD, laser disc, optical disc, digital versatile disc (DVD) , floppy disk and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

As used herein, including in the claims, “or” as used in a list of items (e.g., a list of items prefaced by a phrase such as “at least one of” or “one or more of” ) indicates an inclusive list such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C) . Also, as used herein, the phrase “based on” shall not be construed as a reference to a closed set of conditions. For example, an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on. ”

In the appended figures, similar components or features may have the same reference label. Further, various components of the same type may be distinguished by following the reference label by a dash and a second label that distinguishes among the similar components. If just the first reference label is used in the specification, the description is applicable to any one of the similar components having the same first reference label irrespective of the second reference label, or other subsequent reference label.

The description set forth herein, in connection with the appended drawings, describes example configurations and does not represent all the examples that may be implemented or that are within the scope of the claims. The term “example” used herein means “serving as an example, instance, or illustration, ” and not “preferred” or “advantageous over other examples. ” The detailed description includes specific details for the purpose of providing an understanding of the described techniques. These techniques, however, may be practiced without these specific details. In some instances, known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described examples.

The description herein is provided to enable a person having ordinary skill in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to a person having ordinary skill in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not limited to the examples and designs described herein, but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.

Claims

A method for wireless communications at a user equipment (UE) , comprising:

receiving a configuration indicating a set of measurement resources designated for performing interference measurements by the UE;

measuring interference from one or more candidate UEs over the set of measurement resources;

selecting a target UE from the one or more candidate UEs for a sidelink connection with the UE based at least in part on the measured interference from the one or more candidate UEs; and

establishing a sidelink communications link with the target UE based at least in part on selecting the target UE.
The method of claim 1, further comprising:

determining that a measured interference associated with the target UE exceeds a threshold based at least in part on the measuring, wherein the target UE is selected based at least in part on the measured interference exceeding the threshold.
The method of claim 2, further comprising:

refraining from measuring interference from the one or more candidate UEs other than the target UE over a subsequent set of measurement resources based at least in part on determining that the measured interference associated with the target UE exceeds the threshold.
The method of claim 1, further comprising:

determining that a measured interference associated with a sidelink UE connected to the UE is below a threshold based at least in part on the measuring; and

initiating the measuring of the interference from the one or more candidate UEs over the set of measurement resources after determining that the measured interference associated with the sidelink UE is below the threshold.
The method of claim 1, further comprising:

determining that a measured interference associated with the target UE exceeds an interference measurement associated with a previously measured UE by a threshold, wherein the target UE is selected based at least in part on the measured interference exceeding the interference measurement by the threshold.
The method of claim 5, further comprising:

establishing an initial sidelink connection with the previously measured UE before determining that the measured interference associated with the target UE exceeds the interference measurement associated with the previously measured UE by the threshold.
The method of claim 5, further comprising:

disconnecting from the previously measured UE based at least in part on determining that the measured interference associated with the target UE exceeds the interference measurement associated with the previously measured UE by the threshold.
The method of claim 7, the establishing the sidelink communications link comprising:

establishing the sidelink communications link with the target UE based at least in part on disconnecting from the previously measured UE.
The method of claim 5, further comprising:

transmitting, to the previously measured UE, a report indicating that the measured interference associated with the target UE exceeds the interference measurement associated with the previously measured UE by the threshold.
The method of claim 9, further comprising:

receiving a sidelink connection release message from the previously measured UE in response to the report.
The method of claim 5, further comprising:

transmitting, to a base station serving the UE, a report indicating that the measured interference associated with the target UE exceeds the interference measurement associated with the previously measured UE by the threshold.
The method of claim 1, further comprising:

measuring interference from a second UE over a subsequent set of measurement resources after measuring interference from one or more candidate UEs over the set of measurement resources, wherein the one or more candidate UEs excludes the second UE;

determining that a measured interference associated with the second UE exceeds a threshold based at least in part on measuring interference from the second UE over the subsequent set of measurement resources; and

establishing a second sidelink communications link with the second UE based at least in part on determining that the measured interference associated with the second UE exceeds the threshold.
The method of claim 1, further comprising:

determining that a measured interference associated with the target UE exceeds a threshold based at least in part on the measuring;

determining that an interference measurement associated with a previously measured UE is below a threshold based at least in part on the measuring; and

selecting the target UE for the sidelink connection with the UE based at least in part on the measured interference exceeding the threshold and the interference measurement associated with the previously measured UE being below a second threshold.
The method of claim 1, the receiving the configuration comprising:

receiving the configuration from a base station or a sidelink UE connected to the UE, the sidelink UE different from the target UE.
The method of claim 1, the receiving the configuration comprising:

receiving an indication of a measurement threshold, a set of hysteresis values, one or more measurement offsets, a time to trigger duration, or any combination thereof, wherein the target UE is selected based at least in part on the measurement threshold, the set of hysteresis values, the one or more measurement offsets, the time to trigger duration, or any combination thereof.
A method for wireless communications at a first user equipment (UE) , comprising:

establishing a sidelink communications link with a second UE;

receiving, from the second UE, a report indicating that a measured interference associated with a third UE exceeds an interference measurement associated with the first UE by a threshold; and

transmitting, to the second UE, a sidelink connection release message in response to the report, the sidelink connection release message instructing the second UE to disconnect the sidelink communications link.
The method of claim 16, the transmitting the sidelink connection release message comprising:

transmitting an indication to delay disconnection of the sidelink communications link for a time period.
The method of claim 17, wherein the time period corresponds to a timing for completion of an ongoing communication via the sidelink communications link.
The method of claim 16, further comprising:

delaying transmission of the sidelink connection release message until completion of an ongoing communication via the sidelink communications link.
An apparatus for wireless communications at a user equipment (UE) , comprising:

a processor,

memory coupled to the processor, the processor and memory configured to:

receive a configuration indicating a set of measurement resources designated for performing interference measurements by the UE;

measure interference from one or more candidate UEs over the set of measurement resources;

select a target UE from the one or more candidate UEs for a sidelink connection with the UE based at least in part on the measured interference from the one or more candidate UEs; and

establish a sidelink communications link with the target UE based at least in part on selecting the target UE.
The apparatus of claim 20, wherein the processor and memory are further configured to:

determine that a measured interference associated with the target UE exceeds a threshold based at least in part on the measuring, wherein the target UE is selected based at least in part on the measured interference exceeding the threshold.
The apparatus of claim 21, wherein the processor and memory are further configured to:

refrain from measuring interference from the one or more candidate UEs other than the target UE over a subsequent set of measurement resources based at least in part on determining that the measured interference associated with the target UE exceeds the threshold.
The apparatus of claim 20, wherein the processor and memory are further configured to:

determine that a measured interference associated with a sidelink UE connected to the UE is below a threshold based at least in part on the measuring; and

initiate the measuring of the interference from the one or more candidate UEs over the set of measurement resources after determining that the measured interference associated with the sidelink UE is below the threshold.
The apparatus of claim 20, wherein the processor and memory are further configured to:

determine that a measured interference associated with the target UE exceeds an interference measurement associated with a previously measured UE by a threshold, wherein the target UE is selected based at least in part on the measured interference exceeding the interference measurement by the threshold.
The apparatus of claim 24, wherein the processor and memory are further configured to:

establish an initial sidelink connection with the previously measured UE before determining that the measured interference associated with the target UE exceeds the interference measurement associated with the previously measured UE by the threshold.
The apparatus of claim 24, wherein the processor and memory are further configured to:

disconnect from the previously measured UE based at least in part on determining that the measured interference associated with the target UE exceeds the interference measurement associated with the previously measured UE by the threshold.
The apparatus of claim 26, wherein, to establish the sidelink communications link, the processor and memory are further configured to:

establish the sidelink communications link with the target UE based at least in part on disconnecting from the previously measured UE.
The apparatus of claim 24, wherein the processor and memory are further configured to:

transmit, to the previously measured UE, a report indicating that the measured interference associated with the target UE exceeds the interference measurement associated with the previously measured UE by the threshold.
The apparatus of claim 28, wherein the processor and memory are further configured to:

receive a sidelink connection release message from the previously measured UE in response to the report.
The apparatus of claim 24, wherein the processor and memory are further configured to:

transmit, to a base station serving the UE, a report indicating that the measured interference associated with the target UE exceeds the interference measurement associated with the previously measured UE by the threshold.
The apparatus of claim 20, wherein the processor and memory are further configured to:

measure interference from a second UE over a subsequent set of measurement resources after measuring interference from one or more candidate UEs over the set of measurement resources, wherein the one or more candidate UEs excludes the second UE;

determine that a measured interference associated with the second UE exceeds a threshold based at least in part on measuring interference from the second UE over the subsequent set of measurement resources; and

establish a second sidelink communications link with the second UE based at least in part on determining that the measured interference associated with the second UE exceeds the threshold.
The apparatus of claim 20, wherein the processor and memory are further configured to:

determine that a measured interference associated with the target UE exceeds a threshold based at least in part on the measuring;

determine that an interference measurement associated with a previously measured UE is below a threshold based at least in part on the measuring; and

select the target UE for the sidelink connection with the UE based at least in part on the measured interference exceeding the threshold and the interference measurement associated with the previously measured UE being below a second threshold.
The apparatus of claim 20, wherein the processor and memory are further configured to:

receive the configuration from a base station or a sidelink UE connected to the UE, the sidelink UE different from the target UE.
The apparatus of claim 20, wherein the processor and memory are further configured to:

receive an indication of a measurement threshold, a set of hysteresis values, one or more measurement offsets, a time to trigger duration, or any combination thereof, wherein the target UE is selected based at least in part on the measurement threshold, the set of hysteresis values, the one or more measurement offsets, the time to trigger duration, or any combination thereof.
An apparatus for wireless communications at a first user equipment (UE) , comprising:

a processor,

memory coupled to the processor, the processor and memory configured to:

establish a sidelink communications link with a second UE;

receive, from the second UE, a report indicating that a measured interference associated with a third UE exceeds an interference measurement associated with the first UE by a threshold; and

transmit, to the second UE, a sidelink connection release message in response to the report, the sidelink connection release message instructing the second UE to disconnect the sidelink communications link.
The apparatus of claim 35, wherein, to transmit the sidelink connection release message, the processor and memory are configured to:

transmit an indication to delay disconnection of the sidelink communications link for a time period.
The apparatus of claim 36, wherein the time period corresponds to a timing for completion of an ongoing communication via the sidelink communications link.
The apparatus of claim 35, wherein the processor and memory are further configured to:

delay transmission of the sidelink connection release message until completion of an ongoing communication via the sidelink communications link.
An apparatus for wireless communications at a user equipment (UE) , comprising:

means for receiving a configuration indicating a set of measurement resources designated for performing interference measurements by the UE;

means for measuring interference from one or more candidate UEs over the set of measurement resources;

means for selecting a target UE from the one or more candidate UEs for a sidelink connection with the UE based at least in part on the measured interference from the one or more candidate UEs; and

means for establishing a sidelink communications link with the target UE based at least in part on selecting the target UE.
The apparatus of claim 39, further comprising:

means for determining that a measured interference associated with the target UE exceeds a threshold based at least in part on the measuring, wherein the target UE is selected based at least in part on the measured interference exceeding the threshold.
The apparatus of claim 40, further comprising:

means for refraining from measuring interference from the one or more candidate UEs other than the target UE over a subsequent set of measurement resources based at least in part on determining that the measured interference associated with the target UE exceeds the threshold.
The apparatus of claim 39, further comprising:

means for determining that a measured interference associated with a sidelink UE connected to the UE is below a threshold based at least in part on the measuring; and

means for initiating the measuring of the interference from the one or more candidate UEs over the set of measurement resources after determining that the measured interference associated with the sidelink UE is below the threshold.
The apparatus of claim 39, further comprising:

means for determining that a measured interference associated with the target UE exceeds an interference measurement associated with a previously measured UE by a threshold, wherein the target UE is selected based at least in part on the measured interference exceeding the interference measurement by the threshold.
The apparatus of claim 43, further comprising:

means for establishing an initial sidelink connection with the previously measured UE before determining that the measured interference associated with the target UE exceeds the interference measurement associated with the previously measured UE by the threshold.
The apparatus of claim 43, further comprising:

means for disconnecting from the previously measured UE based at least in part on determining that the measured interference associated with the target UE exceeds the interference measurement associated with the previously measured UE by the threshold.
The apparatus of claim 45, wherein the means for establishing the sidelink communications link comprises:

means for establishing the sidelink communications link with the target UE based at least in part on disconnecting from the previously measured UE.
The apparatus of claim 43, further comprising:

means for transmitting, to the previously measured UE, a report indicating that the measured interference associated with the target UE exceeds the interference measurement associated with the previously measured UE by the threshold.
The apparatus of claim 47, further comprising:

means for receiving a sidelink connection release message from the previously measured UE in response to the report.
The apparatus of claim 43, further comprising:

means for transmitting, to a base station serving the UE, a report indicating that the measured interference associated with the target UE exceeds the interference measurement associated with the previously measured UE by the threshold.
The apparatus of claim 39, further comprising:

means for measuring interference from a second UE over a subsequent set of measurement resources after measuring interference from one or more candidate UEs over the set of measurement resources, wherein the one or more candidate UEs excludes the second UE;

means for determining that a measured interference associated with the second UE exceeds a threshold based at least in part on measuring interference from the second UE over the subsequent set of measurement resources; and

means for establishing a second sidelink communications link with the second UE based at least in part on determining that the measured interference associated with the second UE exceeds the threshold.
The apparatus of claim 39, further comprising:

means for determining that a measured interference associated with the target UE exceeds a threshold based at least in part on the measuring;

means for determining that an interference measurement associated with a previously measured UE is below a threshold based at least in part on the measuring; and

means for selecting the target UE for the sidelink connection with the UE based at least in part on the measured interference exceeding the threshold and the interference measurement associated with the previously measured UE being below a second threshold.
The apparatus of claim 39, wherein the means for receiving the configuration comprises:

means for receiving the configuration from a base station or a sidelink UE connected to the UE, the sidelink UE different from the target UE.
The apparatus of claim 39, wherein the means for receiving the configuration comprises:

means for receiving an indication of a measurement threshold, a set of hysteresis values, one or more measurement offsets, a time to trigger duration, or any combination thereof, wherein the target UE is selected based at least in part on the measurement threshold, the set of hysteresis values, the one or more measurement offsets, the time to trigger duration, or any combination thereof.
An apparatus for wireless communications at a first user equipment (UE) , comprising:

means for establishing a sidelink communications link with a second UE;

means for receiving, from the second UE, a report indicating that a measured interference associated with a third UE exceeds an interference measurement associated with the first UE by a threshold; and

means for transmitting, to the second UE, a sidelink connection release message in response to the report, the sidelink connection release message instructing the second UE to disconnect the sidelink communications link.
The apparatus of claim 54, wherein the means for transmitting the sidelink connection release message comprises:

means for transmitting an indication to delay disconnection of the sidelink communications link for a time period.
The apparatus of claim 55, wherein the time period corresponds to a timing for completion of an ongoing communication via the sidelink communications link.
The apparatus of claim 54, further comprising:

means for delaying transmission of the sidelink connection release message until completion of an ongoing communication via the sidelink communications link.
A non-transitory computer-readable medium storing code for wireless communications at a user equipment (UE) , the code comprising instructions executable by a processor to:

receive a configuration indicating a set of measurement resources designated for performing interference measurements by the UE;

measure interference from one or more candidate UEs over the set of measurement resources;

select a target UE from the one or more candidate UEs for a sidelink connection with the UE based at least in part on the measured interference from the one or more candidate UEs; and

establish a sidelink communications link with the target UE based at least in part on selecting the target UE.
The non-transitory computer-readable medium of claim 58, wherein the instructions are further executable to:

determine that a measured interference associated with the target UE exceeds a threshold based at least in part on the measuring, wherein the target UE is selected based at least in part on the measured interference exceeding the threshold.
The non-transitory computer-readable medium of claim 59, wherein the instructions are further executable to:

refrain from measuring interference from the one or more candidate UEs other than the target UE over a subsequent set of measurement resources based at least in part on determining that the measured interference associated with the target UE exceeds the threshold.
The non-transitory computer-readable medium of claim 58, wherein the instructions are further executable to:

determine that a measured interference associated with a sidelink UE connected to the UE is below a threshold based at least in part on the measuring; and

initiate the measuring of the interference from the one or more candidate UEs over the set of measurement resources after determining that the measured interference associated with the sidelink UE is below the threshold.
The non-transitory computer-readable medium of claim 58, wherein the instructions are further executable to:

determine that a measured interference associated with the target UE exceeds an interference measurement associated with a previously measured UE by a threshold, wherein the target UE is selected based at least in part on the measured interference exceeding the interference measurement by the threshold.
The non-transitory computer-readable medium of claim 62, wherein the instructions are further executable to:

establish an initial sidelink connection with the previously measured UE before determining that the measured interference associated with the target UE exceeds the interference measurement associated with the previously measured UE by the threshold.
The non-transitory computer-readable medium of claim 62, wherein the instructions are further executable to:

disconnect from the previously measured UE based at least in part on determining that the measured interference associated with the target UE exceeds the interference measurement associated with the previously measured UE by the threshold.
The non-transitory computer-readable medium of claim 64, wherein the instructions to establish the sidelink communications link are executable to:

establish the sidelink communications link with the target UE based at least in part on disconnecting from the previously measured UE.
The non-transitory computer-readable medium of claim 62, wherein the instructions are further executable to:

transmit, to the previously measured UE, a report indicating that the measured interference associated with the target UE exceeds the interference measurement associated with the previously measured UE by the threshold.
The non-transitory computer-readable medium of claim 66, wherein the instructions are further executable to:

receive a sidelink connection release message from the previously measured UE in response to the report.
The non-transitory computer-readable medium of claim 62, wherein the instructions are further executable to:

transmit, to a base station serving the UE, a report indicating that the measured interference associated with the target UE exceeds the interference measurement associated with the previously measured UE by the threshold.
The non-transitory computer-readable medium of claim 58, wherein the instructions are further executable to:

measure interference from a second UE over a subsequent set of measurement resources after measuring interference from one or more candidate UEs over the set of measurement resources, wherein the one or more candidate UEs excludes the second UE;

determine that a measured interference associated with the second UE exceeds a threshold based at least in part on measuring interference from the second UE over the subsequent set of measurement resources; and

establish a second sidelink communications link with the second UE based at least in part on determining that the measured interference associated with the second UE exceeds the threshold.
The non-transitory computer-readable medium of claim 58, wherein the instructions are further executable to:

determine that a measured interference associated with the target UE exceeds a threshold based at least in part on the measuring;

determine that an interference measurement associated with a previously measured UE is below a threshold based at least in part on the measuring; and

select the target UE for the sidelink connection with the UE based at least in part on the measured interference exceeding the threshold and the interference measurement associated with the previously measured UE being below a second threshold.
The non-transitory computer-readable medium of claim 58, wherein the instructions to receive the configuration are executable to:

receive the configuration from a base station or a sidelink UE connected to the UE, the sidelink UE different from the target UE.
The non-transitory computer-readable medium of claim 58, wherein the instructions to receive the configuration are executable to:

receive an indication of a measurement threshold, a set of hysteresis values, one or more measurement offsets, a time to trigger duration, or any combination thereof, wherein the target UE is selected based at least in part on the measurement threshold, the set of hysteresis values, the one or more measurement offsets, the time to trigger duration, or any combination thereof.
A non-transitory computer-readable medium storing code for wireless communications at a first user equipment (UE) , the code comprising instructions executable by a processor to:

establish a sidelink communications link with a second UE;

receive, from the second UE, a report indicating that a measured interference associated with a third UE exceeds an interference measurement associated with the first UE by a threshold; and

transmit, to the second UE, a sidelink connection release message in response to the report, the sidelink connection release message instructing the second UE to disconnect the sidelink communications link.
The non-transitory computer-readable medium of claim 73, wherein the instructions to transmit the sidelink connection release message are executable to:

transmit an indication to delay disconnection of the sidelink communications link for a time period.
The non-transitory computer-readable medium of claim 74, wherein the time period corresponds to a timing for completion of an ongoing communication via the sidelink communications link.
The non-transitory computer-readable medium of claim 73, wherein the instructions are further executable to:

delay transmission of the sidelink connection release message until completion of an ongoing communication via the sidelink communications link.