Sidelink establishment based on cross-link interference (CLI) measurement

Abstract

The present disclosure provides systems, methods, and apparatuses for establishing sidelink connections between user equipment (UEs), including computer programs encoded on computer storage media. In some embodiments, a first UE receives a CLI measurement configuration carrying an identifier of a second UE for cross-link interference (CLI) measurement, and selectively establishes a sidelink connection with the second UE using the identifier carried in the CLI measurement configuration.

Description

Technical Field

[0001] The present disclosure generally relates to wireless communication, and more particularly, to establishing a sidelink connection with a wireless communication device. Background Art

[0002] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcasts, etc. These systems are capable of supporting communication with multiple users by sharing available system resources, such as time, frequency, and power. Examples of such multi-access systems include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, and Orthogonal Frequency Division Multiple Access (OFDMA) systems (such as Long Term Evolution (LTE) systems or Fifth Generation (5G) New Radio (NR) systems). A wireless multi-access communication system may include multiple base stations or network access nodes, each of which simultaneously supports communication for multiple communication devices, which may also be referred to as user equipment (UE).

[0003] These multi-access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate within a city, country, region, or even globally. An example telecommunication standard is 5G New Radio (NR), which is part of the continuous mobile broadband evolution promulgated by the Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability, and other requirements. 5G NR includes services associated with enhanced mobile broadband (eMBB), massive machine type communication (mMTC), and ultra-reliable low-latency communication (URLLC). There is a need for further improvement in 5G NR technology. These improvements may also be applicable to other multi-access technologies and telecommunication standards that employ these technologies. Summary of the Invention

[0004] The systems, methods, and devices of the present disclosure each have several innovative aspects, none of which alone is solely responsible for the desired attributes disclosed herein.

[0005] One innovative aspect of the subject matter described in the present disclosure may be implemented as a method for wireless communication. The method may be performed by a first user equipment (UE) and includes: receiving a CLI measurement configuration carrying an identifier of a second UE for cross-link interference (CLI) measurement, and selectively establishing a sidelink connection with the second UE using the identifier carried in the CLI measurement configuration. The identifier may be any suitable identifier or value that the first UE can use to address a message or signal to the second UE for establishing a sidelink connection with the second UE. In some cases, the identifier may be a user equipment identifier (UE ID).

[0006] A CLI measurement configuration can be received via radio resource control (RRC) configuration and can carry a mapping between a UE ID and at least one of a cell radio network temporary identifier (C-RNTI), a temporary mobile station identifier (TMSI), an international mobile subscriber identity (IMSI), a media access control (MAC) address, or any other suitable identity or address assigned to or otherwise associated with a second UE. The CLI measurement configuration can also indicate one or more CLI measurement resources on which the first UE will measure a CLI associated with a UL transmission from the second UE. In some aspects, the CLI measurement configuration can indicate one or more of a periodicity, an offset, a number of resource blocks (RBs), or a number of orthogonal frequency division multiplexing (OFDM) symbols corresponding to the CLI measurement resources on which the second UE will send one or more CLI measurement signals.

[0007] In some embodiments, the first UE can selectively establish a sidelink connection with the second UE based on measurement metrics of one or more CLI measurement signals received from the second UE. In some aspects, the method can further include: receiving a CLI measurement signal from the second UE on one or more indicated CLI measurement resources; determining measurement metrics of the received CLI measurement signal; and determining whether to establish a sidelink connection with the second UE based on the measurement metrics of the CLI measurement signal relative to a value. In some cases, when the measurement metrics of the CLI measurement signal are greater than the value, the first UE establishes a sidelink connection with the second UE, and when the measurement metrics of the CLI measurement signal are not greater than the value, the first UE avoids establishing a sidelink connection. The first UE can determine that the second UE is within a distance of the first UE based on the measurement metrics of the CLI measurement signal being greater than the value. The first UE can also determine that the second UE is greater than a distance from the first UE based on the measurement metrics of the CLI measurement signal not being greater than the value.

[0008] The measurement metric can be any suitable metric, value, or characteristic based on which a first UE can determine the strength or quality of a CLI measurement signal transmitted by a second UE. In some cases, the measurement metric can be a reference signal received power (RSRP) or a reference signal received quality (RSRQ), and the reference signal can be a sounding reference signal (SRS), an uplink demodulation reference signal (DM-RS), or a channel state information (CSI) reference signal (CSI-RS). The CLI measurement configuration can also indicate a reference signal received power type measurement CLI procedure, and the CLI measurement signal can include one or more SRS resource sets or DM-RS resource sets. In other cases, the measurement metric can be a received power measurement, such as a received signal strength indicator (RSSI) of the CLI measurement signal. In some other cases, the measurement metric can be an interference measurement, such as a signal-to-noise ratio (SNR) or a signal-to-interference plus noise ratio (SINR).

[0009] In other embodiments, the first UE can selectively establish a sidelink connection with the second UE based on the presence of a CLI on a downlink (DL) channel or transmission. In some aspects, the method can further include: detecting a CLI on the DL channel caused by an uplink (UL) transmission from the second UE; determining one or more dedicated resources associated with the second UE at least in part based on an identifier; and establishing a sidelink connection with the second UE on the one or more dedicated resources. In some cases, the first UE establishes a sidelink connection with the second UE when the measurement metric of the DL channel is less than a value, and avoids establishing a sidelink connection with the second UE when the measurement metric of the DL channel is not less than the value. In other cases, the first UE can establish a sidelink connection with the second UE when the power consumption associated with sending data to the second UE via the sidelink connection is less than the power consumption associated with sending data to a base station on the UL channel by at least a value. The first UE can also avoid establishing a sidelink connection with the second UE when the power consumption associated with sending data to the second UE is not less than the power consumption associated with sending data to the base station by at least the value.

[0010] Another innovative aspect of the subject matter described in this disclosure can be implemented in a wireless communication device. In some embodiments, the wireless communication device can be a first UE that includes at least one modem, at least one processor communicatively coupled to the at least one modem, and at least one memory communicatively coupled to the at least one processor. The memory can store instructions that, when executed by the at least one processor in conjunction with the at least one modem, cause the first UE to perform operations including: receiving a CLI measurement configuration carrying an identifier uniquely identifying a second UE for CLI measurement; and selectively establishing a sidelink connection with the second UE using the identifier carried in the CLI measurement configuration. The identifier can be any suitable identifier or value used to address a message or signal to the second UE for establishing a sidelink connection with the second UE. In some cases, the identifier can be a UE ID.

[0011] The CLI measurement configuration can be received via RRC configuration and can carry a mapping between the UE ID and at least one of a C-RNTI, TMSI, IMSI, MAC address, or any other suitable identification or address assigned to or otherwise associated with the second UE. The CLI measurement configuration can also indicate one or more CLI measurement resources on which the first UE will measure the CLI associated with UL transmissions from the second UE. In some aspects, the CLI measurement configuration can indicate one or more of a period, an offset, a number of RBs, or a number of OFDM symbols corresponding to the CLI measurement resources on which the second UE will send one or more CLI measurement signals.

[0012] In some embodiments, the first UE can selectively establish a sidelink connection with the second UE based on measurement metrics of one or more CLI measurement signals received from the second UE. In some aspects, the execution of the instructions causes the first UE to perform operations further including: receiving CLI measurement signals from the second UE on one or more indicated CLI measurement resources; determining measurement metrics of the received CLI measurement signals; and determining whether to establish a sidelink connection with the second UE based on the measurement metrics of the CLI measurement signals relative to a value. In some cases, when the measurement metrics of the CLI measurement signals are greater than the value, the first UE establishes a sidelink connection with the second UE, and when the measurement metrics of the CLI measurement signals are not greater than the value, the first UE avoids establishing a sidelink connection. The first UE can determine that the second UE is within a distance of the first UE based on the measurement metrics of the CLI measurement signals being greater than the value. The first UE can also determine that the second UE is greater than a distance from the first UE based on the measurement metrics of the CLI measurement signals not being greater than the value.

[0013] The measurement metric can be any suitable metric, value, or characteristic based on which the first UE can determine the strength or quality of the CLI measurement signal transmitted by the second UE. In some cases, the measurement metric can be RSRP or RSRQ, and the reference signal can be SRS, UL DMRS, or CSI-RS. The CLI measurement configuration can also indicate a reference signal received power type measurement CLI procedure, and the CLI measurement signal can include one or more SRS resource sets or DM-RS resource sets. In other cases, the measurement metric can be a received power measurement, such as RSSI of the CLI measurement signal. In some other cases, the measurement metric can be an interference measurement, such as SNR or SINR.

[0014] In other embodiments, the first UE can selectively establish a sidelink connection with the second UE based on the presence of a CLI on a DL channel or transmission. In some aspects, the execution of the instructions causes the first UE to perform operations that also include: detecting a CLI on the DL channel caused by a UL transmission from the second UE; determining one or more dedicated resources associated with the second UE at least in part based on an identifier; and establishing a sidelink connection with the second UE on the one or more dedicated resources. In some cases, when the measurement metric of the DL channel is less than a value, the first UE establishes a sidelink connection with the second UE, and when the measurement metric of the DL channel is not less than the value, avoids establishing a sidelink connection with the second UE. In other cases, when the power consumption associated with sending data to the second UE via the sidelink connection is less than the power consumption associated with sending data to the base station on the UL channel by at least a value, the first UE can establish a sidelink connection with the second UE. When the power consumption associated with sending data to the second UE is not less than the power consumption associated with sending data to the base station by at least that value, the first UE can also avoid establishing a sidelink connection with the second UE.

[0015] Another innovative aspect of the subject matter described in this disclosure can be implemented in a wireless communication device. In some embodiments, the wireless communication device can be the first UE, which includes: components for receiving a CLI measurement carrying an identifier uniquely identifying the second UE for CLI measurement, and components for selectively establishing a sidelink connection with the second UE using the identifier carried in the CLI measurement configuration. The identifier can be any suitable identifier or value used to address a message or signal to the second UE for establishing a sidelink connection with the second UE. In some cases, the identifier can be a UE ID.

[0016] The CLI measurement configuration can be received via RRC configuration and can carry a mapping between the UE ID and at least one of the C-RNTI, TMSI, IMSI, MAC address, or any other suitable identifier or address assigned to or otherwise associated with a second UE. The CLI measurement configuration can also indicate one or more CLI measurement resources on which the first UE will measure the CLI associated with the UL transmission from the second UE. In some aspects, the CLI measurement configuration can indicate one or more of the periodicity, offset, number of RBs, or number of OFDM symbols corresponding to the CLI measurement resources on which the second UE will transmit one or more CLI measurement signals.

[0017] In some embodiments, the first UE can selectively establish a sidelink connection with the second UE based on the measurement metrics of one or more CLI measurement signals received from the second UE. In some aspects, the first UE can further include: components for receiving CLI measurement signals from the second UE on one or more indicated CLI measurement resources; components for determining the measurement metrics of the received CLI measurement signals; and components for determining whether to establish a sidelink connection with the second UE based on the measurement metrics of the CLI measurement signals relative to a value. In some cases, when the measurement metrics of the CLI measurement signals are greater than the value, the first UE establishes a sidelink connection with the second UE, and when the measurement metrics of the CLI measurement signals are not greater than the value, it avoids establishing a sidelink connection. The first UE can determine that the second UE is within a distance of the first UE based on the measurement metrics of the CLI measurement signals being greater than the value. The first UE can also determine that the second UE is at a distance greater than a distance from the first UE based on the measurement metrics of the CLI measurement signals not being greater than the value.

[0018] The measurement metric can be any suitable metric, value, or characteristic based on which the first UE can determine the strength or quality of the CLI measurement signals transmitted by the second UE. In some cases, the measurement metric can be RSRP or RSRQ, and the reference signal can be SRS, UL DMRS, or CSI-RS. The CLI measurement configuration can also indicate the reference signal received power type for measuring the CLI process, and the CLI measurement signals can include one or more SRS resource sets or DM-RS resource sets. In other cases, the measurement metric can be a received power measurement, such as the RSSI of the CLI measurement signals. In some other cases, the measurement metric can be an interference measurement, such as SNR or SINR.

[0019] In other embodiments, the first UE may selectively establish a sidelink connection with the second UE based on the presence of a CLI on a DL channel or transmission. In some aspects, the first UE may include: components for detecting a CLI on a DL channel caused by a UL transmission from the second UE; components for determining one or more dedicated resources associated with the second UE based at least in part on an identifier; and components for establishing a sidelink connection with the second UE on the one or more dedicated resources. In some cases, when the measurement metric of the DL channel is less than a value, the first UE establishes a sidelink connection with the second UE, and when the measurement metric of the DL channel is not less than the value, it avoids establishing a sidelink connection with the second UE. In other cases, when the power consumption associated with sending data to the second UE via a sidelink connection is less than the power consumption associated with sending data to the base station on a UL channel by at least a value, the first UE may establish a sidelink connection with the second UE. When the power consumption associated with sending data to the second UE is not less than the power consumption associated with sending data to the base station by at least that value, the first UE may also avoid establishing a sidelink connection with the second UE.

[0020] Details of one or more embodiments of the subject matter described in this disclosure are set forth in the accompanying drawings and the following description. Other features, aspects, and advantages will become apparent from the description, the drawings, and the claims. Note that the relative dimensions of the following drawings may not be drawn to scale. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A diagram showing an example wireless communication system is presented.

[0022] Figure 2A An example of a first 5G NR frame is shown.

[0023] Figure 2B An example of a downlink (DL) channel within a 5G NR time slot is shown.

[0024] Figure 2C An example of a second 5G NR frame is shown.

[0025] Figure 2D An example of an uplink (UL) channel within a 5G NR time slot is shown.

[0026] Figure 3 A diagram showing an example base station and user equipment (UE) in an access network is presented.

[0027] Figure 4 A diagram depicting an example UL / DL time division duplex (TDD) transmission scheme supporting cross-link interference (CLI) measurement is presented.

[0028] Figure 5AShows a diagram depicting an example coverage area of a base station according to some embodiments;

[0029] Figure 5B Shows a diagram depicting another example coverage area of a base station according to some embodiments;

[0030] Figure 6A Shows a sequence diagram of wireless communication supporting the establishment of a sidelink channel according to some embodiments.

[0031] Figure 6B Shows a sequence diagram of wireless communication supporting the establishment of a sidelink channel according to some other embodiments.

[0032] Figure 7 Shows a flowchart depicting an example operation of wireless communication for supporting the establishment of a sidelink channel according to some embodiments.

[0033] Figure 8 Shows a flowchart depicting an example operation of wireless communication for supporting the establishment of a sidelink channel according to some embodiments.

[0034] Figure 9 Shows a flowchart depicting an example operation of wireless communication for supporting the establishment of a sidelink channel according to some embodiments.

[0035] Figure 10 Shows a flowchart depicting an example operation of wireless communication for supporting the establishment of a sidelink channel according to some embodiments.

[0036] Figure 11 Shows a flowchart depicting an example operation of wireless communication for supporting the establishment of a sidelink channel according to some embodiments.

[0037] Figure 12 Shows a flowchart depicting an example operation of wireless communication for supporting the establishment of a sidelink channel according to some embodiments.

[0038] Figure 13 Shows a block diagram of an example wireless communication device according to some embodiments.

[0039] Like reference numerals and names in the various figures indicate the same elements.

[0040] Embodiments

[0041] To describe the innovative aspects of the present disclosure, the following description is directed to some specific embodiments. However, those of ordinary skill in the art will readily recognize that the teachings herein can be applied in many different ways. The described embodiments can be implemented in any device, system, or network capable of sending and receiving radio frequency (RF) signals according to one or more of the Long Term Evolution (LTE), 3G, 4G, or 5G (New Radio (NR)) standards released by the Third Generation Partnership Project (3GPP), the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standards, the IEEE 802.15 standards, or the standards defined by the Bluetooth Special Interest Group (SIG), etc. The described embodiments can be implemented in any device, system, or network capable of sending and receiving RF signals according to one or more of the following technologies or techniques: Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal FDMA (OFDMA), Single Carrier FDMA (SC-FDMA), Single User (SU) Multiple Input Multiple Output (MIMO), and Multi-User (MU) MIMO. The described embodiments can also be implemented using other wireless communication protocols or RF signals suitable for use in one or more of Wireless Wide Area Networks (WWANs), Wireless Personal Area Networks (WPANs), Wireless Local Area Networks (WLANs), or Internet of Things (IoT) networks.

[0042] Embodiments of the subject matter described in the present disclosure may allow a UE to establish a sidelink connection with other UEs based on the presence of cross-link interference (CLI) between the UEs or based on the information carried in a CLI measurement configuration. According to various aspects of the present disclosure, a first UE may receive a CLI measurement configuration carrying an identifier of a second UE that uniquely identifies the second UE for CLI measurement. The first UE may selectively establish a sidelink connection with the second UE using the identifier based on one or more of a measurement metric of a CLI measurement signal received from the second UE, a measurement metric of a DL channel between the first UE and a base station, a CLI level on the DL channel, a power consumption level associated with sending data to the second UE on the sidelink connection, or a power consumption level associated with sending data to the base station on the UL channel. In some cases, the identifier may be a UE ID.

[0043] Measurement metrics may include one or more of RSRP, RSRQ, RSSI, SNR, or SINR. In some cases, the measurement metrics may be indicated in a CLI measurement configuration. In some other instances, the CLI measurement configuration may indicate the CLI measurement resources on which the first UE will receive the CLI measurement signal, the CLI measurement resources on which the first UE will measure the CLI associated with the UL transmission from the second UE, or one or more of at least one of the periodicity, offset, RB, or OFDM symbol corresponding to the CLI measurement resources.

[0044] In some cases, when the measurement metrics determined for one or more CLI measurement signals are greater than a value, the first UE may establish a sidelink connection with the second UE, or when the determined measurement metrics are not greater than the value, the first UE may avoid establishing a sidelink connection with the second UE. In other cases, when the measurement metrics of the DL channel are less than a value, the first UE may establish a sidelink connection with the second UE, and when the measurement metrics of the DL channel are not less than the value, the first UE may avoid establishing a sidelink connection with the second UE. In some other cases, when the power consumption associated with sending data to the second UE via a sidelink connection is less than the power consumption associated with sending data to the base station on the UL channel by at least a value, the first UE may establish a sidelink connection with the second UE.

[0045] Specific embodiments of the subject matter described in this disclosure may be implemented to achieve one or more of the following potential advantages. By allowing the first UE to determine whether to establish a sidelink connection with the second UE based on the presence of the CLI, the measurement metrics of the CLI measurement signal or the DL channel, or the power consumption associated with the transmission on the potential sidelink connection, when the first UE is no longer within the coverage area of the base station, the first UE may maintain a connection with the base station via the sidelink connection and the second UE. In this way, the coverage area provided by the base station for the first UE can be effectively extended by the first UE, for example, without the help of the base station or without changing or modifying the operating parameters of the base station. This may be particularly important when the first UE has limited capabilities (such as a Reduced Capability (RedCap) UE or a Low Complexity UE with reduced bandwidth (BL UE)) and may fall outside the coverage area of the base station while other nearby UEs (such as the second UE) remain within the coverage area of the base station.

[0046] Among other advantages, allowing the first UE to select or determine the above value can ensure that at least one of the signal strength, signal quality, or channel conditions of the sidelink connection established with another UE is better than the corresponding signal strength, signal quality, or channel conditions of the access channel between the first UE and the base station. In this way, the first UE can increase the likelihood that a specific sidelink connection with another UE can be used to effectively extend the coverage area provided for the first UE.

[0047] Aspects of a telecommunications system will now be presented with reference to various apparatuses and methods. These apparatuses and methods will be described in the following embodiments and depicted in the drawings by various modules, components, circuits, processes, algorithms, etc. (collectively referred to as "elements"). These elements can be implemented using electronic hardware, computer software, or any combination thereof. Whether these elements are implemented as hardware or software depends on the particular application and the design constraints imposed on the overall system.

[0048] By way of example, an element, or any portion of an element, or any combination of elements can be implemented as a "processing system" that includes one or more processors. Examples of processors include microprocessors, microcontrollers, graphics processing units (GPUs), central processing units (CPUs), application processors, digital signal processors (DSPs), reduced instruction set computing (RISC) processors, system on a chip (SOC), baseband processors, field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functions described throughout this disclosure. One or more processors in the processing system can execute software. Software should be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0049] Thus, in one or more exemplary embodiments, the described functions can be implemented in hardware, software, or any combination thereof. If implemented in software, the functions can be stored on or encoded as one or more instructions or code on a computer-readable medium. Computer-readable media includes computer storage media. Storage media can be any available media that can be accessed by a computer. By way of example and not limitation, such computer-readable media can include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), optical disk storage, magnetic disk storage, or other magnetic storage devices, combinations of the aforementioned types of computer-readable media, or any other medium that can be used to store computer-executable code in the form of instructions or data structures that can be accessed by a computer.

[0050] Figure 1A diagram showing an example of a wireless communication system 100. The wireless communication system 100 (which may be a Next Generation RAN (NG-RAN)) includes a base station 102, a UE 104, an Evolved Packet Core (EPC) 160, and another core network 190. The base station 102 may include a macro cell (high-power cellular base station) or a small cell (low-power cellular base station). Macro cells include base stations. Small cells include femtocells, picocells, and microcells.

[0051] The base station 102 configured for 4G LTE (collectively referred to as the Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN)) can interface with the EPC 160 via the S1 interface through the backhaul link 132, and the base station 102 configured for 5G NR can interface with the core network 190 via the N2 and N3 interfaces through the backhaul link 184. The base stations 102 can communicate with each other via the X2 interface through one or more backhaul links 134. The base station 102 can perform multiple functions, including (but not limited to): transmission of user data, radio channel encryption and decryption, integrity protection, header compression, mobility control functions (such as handover, dual connectivity), inter-cell interference coordination, connection establishment and release, load balancing, distribution of non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS), subscriber and device tracking, radio access network information management (RIM), paging, positioning, and delivery of warning messages.

[0052] Each of the base stations 102 can provide communication coverage for a corresponding geographical coverage area 110. There may be overlapping geographical coverage areas 110. For example, the small cell 102' may have a coverage area 110' that overlaps with the coverage areas 110 of one or more macro base stations 102. A network that includes both small cells and macro cells can be referred to as a heterogeneous network. The heterogeneous network may also include a Home Evolved Node B (HeNB), which can provide services to a restricted group called a Closed Subscriber Group (CSG).

[0053] The wireless communication system 100 may utilize licensed and unlicensed radio spectrum bands. For example, the wireless communication system 100 may employ Licensed-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 an unlicensed radio spectrum band, devices such as the base station 105 and the UE 404 may employ carrier sensing for collision detection and avoidance. In some cases, operation in the unlicensed band may be based on a carrier aggregation configuration in combination with a component carrier operating in a licensed band (e.g., LAA). Operations in the unlicensed spectrum may include downlink transmission, uplink transmission, P2P transmission, D2D transmission, etc.

[0054] The wireless communication system may also include a Wi-Fi Access Point (AP) 150 that communicates with a Wi-Fi Station (STA) 152 via a communication link 154 in the 2.4 GHz unlicensed spectrum, the 5 GHz unlicensed spectrum, or both. When communicating in the unlicensed spectrum, the STA 152 and the AP 150 may perform a Clear Channel Assessment (CCA) before communication to determine whether the channel is available.

[0055] A given base station 102 may also be referred to as a gNB, Node B, evolved Node B (eNB), access point, base station transceiver, radio base station, radio transceiver, transceiver function, Basic Service Set (BSS), Extended Service Set (ESS), Transmission and Reception Point (TRP), or some other suitable term. The base station 102 provides an access point for the UE 104 to the EPC 160 or the core network 190. Examples of the UE 104 include cellular phones, smart phones, Session Initiation Protocol (SIP) phones, laptop computers, personal digital assistants (PDAs), satellite radios, global positioning systems, multimedia devices, video devices, digital audio players (such as MP3 players), cameras, gaming consoles, tablet computers, smart devices, wearable devices, vehicles, electric meters, gas pumps, large or small kitchen appliances, healthcare devices, implants, sensors / actuators, displays, or any other similar functional device. Some UEs 104 may be referred to as IoT devices (such as parking meters, gas pumps, toasters, vehicles, heart monitors, etc.). Other UEs 104 may be referred to as Cellular IoT (CIoT) devices (such as smart phones capable of narrowband communication designed for IoT devices based on one or more). The UE 104 may also be referred to as a station, mobile station, subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.

[0056] Base station 102, whether it is a small cell 102' or a large cell (such as a macro base station), may include an eNB, a gNodeB (gNB), or other types of base stations. Some base stations (such as gNB 180) may communicate with UE 104 in a millimeter wave (mmW) frequency and / or near mmW frequency in a traditional sub-6 GHz spectrum. When gNB 180 operates at mmW or near mmW frequencies, gNB 180 may be referred to as a millimeter wave or mmW base station. Extremely high frequency (EHF) is a part of RF in the electromagnetic spectrum. The range of EHF is from 30 GHz to 300 GHz, and the wavelength is between 1 millimeter and 10 millimeters. The radio waves in this frequency band may be referred to as millimeter waves. Near mmW may extend down to 3 GHz frequency with a 100 millimeter wavelength. The super high frequency (SHF) band extends between 3 GHz and 30 GHz and is also known as centimeter waves.

[0057] Communication using a radio frequency band of millimeter wave or near millimeter wave (such as between 3 GHz and 300 GHz) has extremely high path loss and short distance. The mmW base station 180 may utilize beamforming 182 with the UE 104 to compensate for the extremely high path loss and short distance. 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 (such as base station 102 or UE 104) to shape or direct an antenna beam along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining signals communicated via antenna elements of an antenna array such that some signals propagating in a particular direction relative to the antenna array experience constructive interference while other signals experience destructive interference. The adjustment of the signals communicated via the antenna elements may include the transmitting device or the receiving device applying a certain amplitude offset, phase offset, or both to the signals carried via the antenna elements associated with that device. The adjustment associated with each antenna element may be defined by a set of beamforming weights associated with a particular direction (such as relative to the antenna array of the transmitting device or receiving device, or relative to some other direction).

[0058] For example, the base station 180 may transmit beamformed signals to the UE 104 in one or more transmission directions 182'. The UE 104 may receive beamformed signals from the base station 180 in one or more reception directions 182". The UE 104 may also transmit beamformed signals to the base station 180 in one or more transmission directions. The base station 180 may receive beamformed signals from the UE 104 in one or more reception directions. The base station 180 and the UE 104 may perform beam training to determine the optimal reception and transmission directions for each of the base station 180 and the UE 104. The transmission and reception directions of the base station 180 may be the same or different. The transmission and reception directions of the UE 104 may be the same or different.

[0059] The base stations 102 and 104 may communicate wirelessly with each other via one or more communication links 120 using one or more carriers. The term "carrier" may refer to a set of radio spectrum resources having a defined physical layer structure for supporting the communication link 120. For example, a carrier for the communication link 120 may include a portion of a radio spectrum band (such as a bandwidth part (BWP)) that operates according to physical layer channels for a given radio access technology. Each physical layer channel may carry acquisition signaling (such as synchronization signals, system information), control signaling for coordinating carrier operation, user data, or other signaling. The wireless communication system 100 may support communication between the base stations 102 and the UE 104 using carrier aggregation or multi-carrier operation. Carrier aggregation may be used with both frequency division duplex (FDD) and time division duplex (TDD) component carriers. The allocation of carriers may be asymmetric with respect to DL and UL channels, for example, such that the UL and DL channels may include different numbers of carriers. Component carriers may include a primary component carrier and one or more secondary component carriers. The primary component carrier may be referred to as the primary cell (PCell), and the secondary component carriers may be referred to as secondary cells (SCells).

[0060] In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types (such as MTC, NB-IoT, enhanced mobile broadband (eMBB)) or others that may provide access for different types of devices.

[0061] The communication link 120 can include an uplink (UL) transmission from the UE 104 to the base station 102 or a downlink (DL) transmission from the base station 102 to the UE 104. The communication link 120 can use multiple-input and multiple-output (MIMO) antennas, for example, to provide spatial multiplexing, beamforming, or transmit diversity. The base station 102 and the UE 104 can use a spectral bandwidth of up to Y MHz (e.g., 5 MHz, 10 MHz, 15 MHz, 20 MHz, 100 MHz, 400 MHz, etc.) on each carrier allocated in a carrier aggregation of up to a total of Yx MHz (e.g., x component carriers) for transmission in each direction. The carriers can be adjacent to each other or non-adjacent.

[0062] Some UEs 104 can communicate with each other using device-to-device (D2D) communication links 158. The D2D communication links 158 can use DL / UL WWAN spectrum. The D2D communication links 158 can use one or more sidelink channels, such as the Physical Sidelink Broadcast Channel (PSBCH), the Physical Sidelink Discovery Channel (PSDCH), the Physical Sidelink Shared Channel (PSSCH), and the Physical Sidelink Control Channel (PSCCH). D2D communication can be performed via various wireless D2D communication systems, such as, for example, FlashLinQ, WiMedia, Bluetooth, ZigBee, Wi-Fi based on the IEEE 802.11 standard, LTE, or NR.

[0063] Some UEs 104 (such as MTC or IoT devices) can be low-cost or low-complexity devices and can provide automated communication between machines (such as by using machine-to-machine (M2M) communication). M2M communication or MTC can refer to data communication technologies that allow devices to communicate with each other or with the base station 102 without human intervention. In some examples, M2M communication or MTC can include communication from devices that integrate sensors or meters to measure or capture information and relay such information to a central server or application that uses the information or presents the information to a human interacting with the application. Some UEs 104 can be designed to collect information or implement automated behavior of machines or other devices. Examples of applications of MTC devices include smart metering, inventory monitoring, water level monitoring, device 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.

[0064] The wireless communication system 100 can be a packet-based network operating according to a hierarchical protocol stack. In the user plane, the communication on the bearer or Packet Data Convergence Protocol (PDCP) layer can be IP-based. The Radio Link Control (RLC) layer can perform packet segmentation and reassembly for communication over logical channels. The Medium Access Control (MAC) layer can perform priority handling and multiplex logical channels into transport channels. The MAC layer can also use error detection techniques, error correction techniques, or both to support retransmission at the MAC layer to improve link efficiency. In the control plane, the RRC protocol layer can provide the establishment, configuration, and maintenance of the RRC connection between the UE 104 and the base station 102 or the EPC 160 that supports the radio bearers for user plane data. At the physical layer, the transport channels can be mapped to physical channels.

[0065] The EPC 160 can provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. In some embodiments, the EPC 160 can include a Mobility Management Entity (MME) 162, other MMEs 164, a Serving Gateway 166, a Multimedia Broadcast Multicast Service (MBMS) Gateway 168, a Broadcast Multicast Service Center (BM-SC) 170, and a Packet Data Network (PDN) Gateway 172. The MME 162 is a control plane entity that manages access and mobility and can communicate with the Home Subscriber Server (HSS) 174. The MME 162 can manage the non-access stratum (NAS) functions of the UE 104 served by the base station 104 associated with the EPC 160, such as mobility, authentication, and bearer management, and can handle the signaling between the UE 104 and the EPC 160. All user IP packets are transmitted through the Serving Gateway 166, which is connected to the PDN Gateway 172. The PDN Gateway 172 provides UE IP address allocation and other functions. The PDN Gateway 172 and the BM-SC 170 are connected to the IP services 176. The IP services 176 can include the Internet, an intranet, an IP Multimedia Subsystem (IMS), a PS streaming service, or other IP services. The BM-SC 170 can provide functions for MBMS user service provision and delivery. The BM-SC 170 can serve as an entry point for content provider MBMS transmissions, can be used to authorize and initiate MBMS bearer services within a Public Land Mobile Network (PLMN), and can be used to schedule MBMS transmissions. The MBMS Gateway 168 can be used to distribute MBMS traffic to the base stations 102 belonging to a Multicast Broadcast Single Frequency Network (MBSFN) area for a particular broadcast service and can be responsible for session management (start / stop) and collecting MBMS-related charging information.

[0066] The core network 190 may include an Access and Mobility Management Function (AMF) 192, one or more other AMFs 193, a Session Management Function (SMF) 194, and a User Plane Function (UPF) 195. The AMF 192 may communicate with a Unified Data Management (UDM) 196. The AMF 192 is a control node that processes signaling between the UE 104 and the core network 190. Generally, the AMF 192 provides QoS flow and session management. User IP packets are transmitted through the UPF 195. The UPF 195 provides UE IP address allocation and other functions. The UPF 195 is connected to an IP service 197. The IP service 197 may include the Internet, an intranet, an IP Multimedia Subsystem (IMS), a PS streaming service, and / or other IP services.

[0067] Referring again to Figure 1 , in some aspects, the base station 102 / 180 may be configured to select a beam for transmitting DL data to the UE 104 based on one or more of the RSRP level of a reference signal received by the UE 104, the delay spread value of reference data received by the UE 104, the SINR value of a reference signal received by the UE 104, and / or multiple settings or capabilities of an equalizer used by the UE 104 to equalize the channel delay spread associated with data received from the base station.

[0068] Figure 2A An example of a first time slot 200 within the 5G NR frame structure is shown. Figure 2B An example of a DL channel 230 within a 5G NR time slot is shown. Figure 2C An example of a second time slot 250 within the 5G NR frame structure is shown. Figure 2D An example of a UL channel 280 within a 5G NR time slot is shown. In some cases, the 5G NR frame structure may be FDD, where for a particular set of subcarriers (carrier system bandwidth), the time slots within the set of subcarriers are dedicated to DL or UL transmission. In some other cases, the 5G NR frame structure may be TDD, where for a particular set of subcarriers (carrier system bandwidth), the time slots within the set of subcarriers are dedicated to both DL and UL transmission simultaneously. In Figure 2A and Figure 2CIn the example shown, the 5G / NR frame structure is based on TDD. Slot 4 is configured in slot format 28 (mainly DL), where D indicates DL, U indicates UL, and X indicates that the slot is flexibly used between DL / UL. And slot 3 is configured in slot format 34 (mainly UL). Although slot 3 and slot 4 are shown in slot formats 34 and 28 respectively, any particular slot can be configured in any one of the various available slot formats 0–61. Slot formats 0 and 1 are DL and UL respectively. The other slot formats 2–61 include a mixture of DL, UL, and flexible symbols. The UE can configure the slot format dynamically via downlink control information (DCI) or semi-statically via radio resource control (RRC) signaling via a slot format indicator (SFI). The configured slot format can also be applied to the 5G NR frame structure based on FDD.

[0069] Other wireless communication technologies may have different frame structures or different channels. A frame can be divided into multiple subframes of equal size. For example, a frame with a duration of 10 milliseconds (ms) can be divided into 10 subframes of equal size, each subframe having a duration of 1 ms. Each subframe can include one or more slots. A subframe can also include mini-slots, which can include 7, 4, or 2 symbols. Each slot can include 7 or 14 symbols, depending on the slot configuration. For slot configuration 0, each slot can include 14 symbols, and for slot configuration 1, each slot can include 7 symbols. The symbols on the DL can be cyclic prefix (CP) OFDM (CP-OFDM) symbols. The symbols on the UL can be CP-OFDM symbols (such as for high-throughput scenarios) or discrete Fourier transform (DFT) spread OFDM (DFT-s-OFDM) symbols (also known as single-carrier frequency-division multiple access (SC-FDMA) symbols) (such as for power-constrained scenarios).

[0070] The number of slots within a subframe is based on the slot configuration and the parameter set. For slot configuration 0, different parameter sets (μ) 0 to 5 allow 1, 2, 4, 8, 16, and 32 slots per subframe respectively. For slot configuration 1, different parameter sets 0 to 2 allow 2, 4, and 8 slots per subframe respectively. Thus, for slot configuration 0 and parameter set μ, each slot has 14 symbols and each subframe has 2^μ slots. The subcarrier spacing and symbol length / duration are functions of the parameter set. The subcarrier spacing can be equal to 2^μ * 15 kHz, where μ is the parameter set from 0 to 5. In this way, parameter set μ = 0 has a subcarrier spacing of 15 kHz, and parameter set μ = 5 has a subcarrier spacing of 480 kHz. The symbol length / duration is inversely proportional to the subcarrier spacing. Figures 2A to 2DAn example of slot configuration 0 with 14 symbols per slot and parameter set μ = 0 with 1 slot per subframe is provided. The subcarrier spacing is 15 kHz, and the symbol duration is approximately 66.7 microseconds (μs).

[0071] A resource grid can be used to represent the frame structure. Each slot includes resource blocks (RBs) (also known as physical RBs (PRBs)), which span 12 consecutive subcarriers and extend across multiple symbols. The subcarriers intersect and span 14 symbols. The intersection of subcarriers and RBs defines a number of resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.

[0072] As Figure 2A shown, some REs carry reference signals (RSs) for the UE. In some configurations, one or more REs can carry demodulation reference signals (DM-RSs) (designated as Rx for a particular configuration, where 100x is the port number, but other DM-RS configurations are also possible). In some configurations, one or more REs can carry channel state information reference signals (CSI-RSs) for channel measurements at the UE. REs can also include beam measurement reference signals (BRSs), beam refinement reference signals (BR-RSs), and phase tracking reference signals (PT-RSs).

[0073] Figure 2B Examples of various DL channels within a subframe of a frame are shown. The physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs), each CCE including nine resource element groups (REGs), each REG including four consecutive REs in an OFDM symbol. The primary synchronization signal (PSS) can be in symbol 2 of a particular subframe of the frame. UE 104 uses the PSS to determine subframe or symbol timing and the physical layer identity. The secondary synchronization signal (SSS) can be in symbol 4 of a particular subframe of the frame. The UE uses the SSS to determine the physical layer cell identity group number and radio frame timing. Based on the physical layer identity and the physical layer cell identity group number, the UE can determine the physical cell identifier (PCI). Based on the PCI, the UE can determine the location of the above DM-RS. The physical broadcast channel (PBCH) carrying the master information block (MIB) can be logically grouped with the PSS and SSS to form a synchronization signal (SS) / PBCH block. The MIB provides a number of RBs in the system bandwidth and the system frame number (SFN). The physical downlink shared channel (PDSCH) carries user data, broadcast system information not sent via the PBCH (such as system information blocks (SIBs)), and paging messages.

[0074] As Figure 2CAs shown, some REs carry DM-RS (indicated as R for a specific configuration, but other DM-RS configurations are possible) for channel estimation at the base station. The UE can send DM-RS for the physical uplink control channel (PUCCH) and DM-RS for the physical uplink shared channel (PUSCH). The PUSCH DM-RS can be sent in the previous one or two symbols of the PUSCH. The PUCCH DM-RS can be sent in different configurations, depending on whether a short PUCCH or a long PUCCH is sent and depending on the specific PUCCH format used. Although not shown, the UE can send a sounding reference signal (SRS). The base station can use the SRS for channel quality estimation to enable frequency-dependent scheduling on the UL.

[0075] Figure 2D Examples of various UL channels within a subframe of a frame are shown. The PUCCH can be located as indicated in one configuration. The PUCCH carries uplink control information (UCI), such as a scheduling request, a channel quality indicator (CQI), a precoding matrix indicator (PMI), a rank indicator (RI), and HARQ ACK / NACK feedback. The PUSCH carries data and can additionally be used to carry a buffer status report (BSR), a power headroom report (PHR), or UCI.

[0076] Figure 3Shows a block diagram of an example base station 310 and a UE 350 in an access network. In the DL, IP packets from the EPC 160 can be provided to the controller / processor 375. The controller / processor 375 implements Layer 3 and Layer 2 functions. Layer 3 includes the Radio Resource Control (RRC) layer, and Layer 2 includes the Service Data Adaptation Protocol (SDAP) layer, the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer, and the Media Access Control (MAC) layer. The controller / processor 375 provides the following functions: RRC layer functions associated with the broadcast of system information (such as MIB, SIB), RRC connection control (such as RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release), radio access technology (RAT) mobility, and measurement configuration for UE measurement reporting; PDCP layer functions associated with header compression / decompression, security (encryption, decryption, integrity protection, integrity verification), and handover support functions; RLC layer functions associated with the transmission of upper layer packet data units (PDUs), error correction via ARQ, concatenation, segmentation, and reassembly of RLC service data units (SDUs), re-segmentation of RLC data PDUs, and re-ordering of RLC data PDUs; and MAC layer functions associated with the mapping between logical channels and transport channels, multiplexing of MAC SDUs into transport blocks (TBs), demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction via HARQ, priority handling, and logical channel prioritization.

[0077] The transmit (TX) processor 316 and the receive (RX) processor 370 implement layer 1 functions associated with various signal processing functions. Layer 1, which includes the physical (PHY) layer, may include error detection on the transport channel, forward error correction (FEC) encoding / decoding of the transport channel, interleaving, rate matching, mapping to the physical channel, modulation / demodulation of the physical channel, and MIMO antenna processing. The TX processor 316 processes the mapping to the signal constellation based on various modulation schemes such as binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), M-phase shift keying (M-PSK), and M-quadrature amplitude modulation (M-QAM). The encoded and modulated symbols can then be segmented into parallel streams. Each stream can then be mapped to OFDM subcarriers, multiplexed with reference signals such as pilot signals in the time and / or frequency domain, and then combined using an inverse fast Fourier transform (IFFT) to generate a physical channel carrying a stream of time-domain OFDM symbols. The OFDM stream is precoded in space to generate multiple spatial streams. Channel estimates from the channel estimator 374 can be used to determine the encoding and modulation schemes, as well as for spatial processing. The channel estimates can be derived from reference signals transmitted by the UE 350 or channel condition feedback. Each spatial stream can then be provided to a different antenna 320 via a separate transmitter 318TX. Each transmitter 318TX can modulate an RF carrier with the corresponding spatial stream for transmission.

[0078] At the UE 350, each receiver 354RX receives signals via its corresponding antenna 352. Each receiver 354RX recovers the information modulated onto the RF carrier and provides the information to the receive (RX) processor 356. The TX processor 368 and the RX processor 356 implement layer 1 functions associated with various signal processing functions. The RX processor 356 can perform spatial processing on the information to recover any spatial streams destined for the UE 350. If multiple spatial streams are destined for the UE 350, they can be combined by the RX processor 356 into a single OFDM symbol stream. The RX processor 356 then uses a fast Fourier transform (FFT) to convert the OFDM symbol stream from the time domain to the frequency domain. The frequency-domain signal includes a separate OFDM symbol stream for each subcarrier of the OFDM signal. By determining the most likely signal constellation points transmitted by the base station 310, the symbols on each subcarrier and the reference signals can be recovered and demodulated. These soft decisions can be based on the channel estimates computed by the channel estimator 358. The soft decisions are then decoded and deinterleaved to recover the data and control signals originally transmitted by the base station 310 on the physical channel. The data and control signals are then provided to the controller / processor 359, which implements layer 3 and layer 2 functions.

[0079] The controller / processor 359 may be associated with a memory 360 that stores program code and data. The memory 360 may be referred to as a computer-readable medium. In the UL, the controller / processor 359 provides demultiplexing between transport channels and logical channels, packet reassembly, decryption, header decompression, and control signal processing to recover IP packets from the EPC 160. The controller / processor 359 is also responsible for error detection using the ACK or NACK protocol to support HARQ operations.

[0080] Similar to the functions described in connection with the DL transmission of the base station 310, the controller / processor 359 provides the following functions: RRC layer functions associated with system information (such as MIB and SIB) acquisition, RRC connection, and measurement reporting; PDCP layer functions associated with header compression / decompression and security (encryption, decryption, integrity protection, integrity verification); RLC layer functions associated with the transmission of upper layer PDUs, error correction via ARQ, concatenation, segmentation, and reassembly of RLC SDUs, re-segmentation of RLC data PDUs, and re-ordering of RLC data PDUs; and MAC layer functions associated with the mapping between logical channels and transport channels, multiplexing of MAC SDUs into transport blocks, demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction via HARQ, priority handling, and logical channel prioritization.

[0081] Channel estimates derived from reference signals or feedback sent by the channel estimator 358 from the base station 310 may be used by the TX processor 368 to select an appropriate coding and modulation scheme and to assist with spatial processing. The spatial streams generated by the TX processor 368 may be provided to different antennas 352 via a separate transmitter 354TX. Each transmitter 354TX may modulate an RF carrier using the corresponding spatial stream for transmission.

[0082] In a manner similar to that described in connection with the receiver function at the UE 350, UL transmissions are processed at the base station 310. Each receiver 318RX receives signals via its corresponding antenna 320. Each receiver 318RX recovers the information modulated onto the RF carrier and provides this information to the RX processor 370.

[0083] The controller / processor 375 may be associated with a memory 376 that stores program code and data. The memory 376 may be referred to as a computer-readable medium. In the UL, the controller / processor 375 provides demultiplexing between transport channels and logical channels, packet reassembly, decryption, header decompression, control signal processing to recover IP packets from the UE 350. The IP packets from the controller / processor 375 may be provided to the EPC 160. The controller / processor 375 is also responsible for error detection using the ACK or NACK protocol to support HARQ operations. Information to be wirelessly communicated, such as LTE- or NR-based communication, is encoded at the PHY layer and mapped to one or more radio channels for transmission.

[0084] In Figure 3 the example of, each antenna 352 of the UE 350 is coupled to a corresponding transmitter 354TX. However, in some other embodiments, the UE 350 may include fewer transmitters (or transmit chains) than receive (RX) antennas. Although not shown for simplicity, each transmitter may be coupled to a corresponding power amplifier (PA) that amplifies the signal to be transmitted. The combination of the transmitter and the PA may be referred to herein as a "transmit chain" or "TX chain". To save cost or die area, the same PA may be reused to transmit signals through multiple RX antennas. In other words, one or more TX chains of the UE may be selectively coupled to multiple RX antenna ports.

[0085] Figure 4 FIG. 400 shows an illustration of an example UL / DL time division duplex (TDD) transmission scheme that supports cross-link interference (CLI) measurement according to some embodiments. The TDD transmission scheme may be implemented in a wireless communication system that includes a first base station 402A, a second base station 402B, a first UE 404A, and a second UE 404B. The first base station 402A may be any base station, access node, access terminal, TRP, or network entity capable of providing wireless signal coverage for its corresponding cell 420A. Similarly, the second base station 402B may be any base station, access node, access terminal, TRP, or network entity capable of providing wireless signal coverage for its corresponding cell 420B. In some cases, the first base station 402A and the second base station 402B may be the same base station. The first UE 404A and the second UE 404B may be any suitable wireless communication device, such as Figure 1 the UE 104 of Figure 3 the UE350. In some embodiments, the first UE 404A may be designated as the victim UE, and the second UE 404B may be designated as the aggressor UE.

[0086] A wireless communication system may employ TDD communication to allow UL and DL transmissions on a shared wireless medium. In some embodiments, each of base stations 402A and 402B may determine the TDD configuration of its corresponding cell. For example, the first base station 402A may select or determine a first TDD configuration 410A to be used in the corresponding cell 410A, and the second base station 402B may select or determine a second TDD configuration 410B to be used in the corresponding cell 410B. The TDD configurations 410A and 410B may be cell-specific, UE-specific, or a combination of both. Each of the TDD configurations 410A and 410B may include one or more downlink "D" symbols 412, one or more uplink "U" symbols 414, and / or one or more flexible "X" symbols 416. That is, the time slots represented by each of the TDD configurations 410A and 410B may include one or more symbol periods for DL symbols, one or more symbol periods for UL symbols, and / or one or more symbol periods for flexible symbols.

[0087] Base stations 402A and 402B may transmit DL data in one or more DL symbols 412 of the respective TDD configurations 410A and 410B, and UEs 404A and 404B may transmit UL data in one or more UL symbols 414 of the respective TDD configurations 410A and 410B. In some cases, the flexible symbol 416 may be used as a guard period between UL and DL transmissions configured by the TDD configurations 410A and 410B. The guard period may prevent inter-symbol interference (ISI), and may also provide additional time for a UE (such as UEs 404A and 404B) to adjust the radio frequency when switching between receiving DL data and transmitting UL data. In some cases, the flexible symbol 416 may be converted to a UL or DL symbol based on a higher layer configuration (such as provided by RRC signaling) or a dynamic configuration (such as provided by a DCI message).

[0088] The use of the TDD configurations 410A and 410B by the respective base stations 402A and 402B may result in concurrent UL and DL transmissions in the same symbol period(s) of a time slot, which in turn may result in a conflict on the wireless medium. For example, two UL symbols 414C in the first TDD configuration 410A overlap in time, but have different transmission directions from two DL symbols 412C in the second TDD configuration 410B. In Figure 4In the example, cells 420A and 420B are adjacent cells, and the first UE 404A is relatively close to the second UE 404B (such as being less than a distance apart from each other). The relative proximity between UEs 404A and 404B can increase the likelihood that an UL (uplink) transmission from the second UE 404B interferes with the concurrent reception of DL (downlink) data by the first UE 404A.

[0089] This type of interference is generally referred to as cross-link interference (CLI). For example, an UL transmission using UL symbol 414C from the second UE 404B may cause CLI to appear in the DL data sent to the first UE 404A using DL symbol 412C. In some cases, a UE may use the amount of CLI caused by an UL transmission as an indicator of the signal strength, integrity, and / or power level of a candidate channel on which to establish a sidelink connection with the second UE 404B. In other cases, a UE may use the amount of CLI generated by an UL transmission as an indicator of the signal strength, integrity, and / or power level of a signal or message sent from the second UE 404B.

[0090] The amount of cross-link interference on a DL channel caused by an UL transmission from the second UE 404B can be used by the first UE 404A to determine whether to establish a sidelink connection with the second UE 604B. In some embodiments, a signal transmitted by the second UE 404B using UL symbol 414C may manifest as CLI to the first UE 404A. The first UE 404A can receive these signals based on a CLI measurement configuration. The first UE 404A can also determine measurement metrics (such as RSRP, RSRQ, or RSSI values) of these signals. In some cases, the base station 402 may schedule resources for sidelink communication between the first UE 404A and the second UE 404B. For example, the base station 402 may send a PDCCH that carries a general permission for sidelink communication or a link-specific permission for sidelink communication.

[0091] Figure 5A Illustration 500 shows an illustration depicting an example coverage area of a base station according to some embodiments. Illustration 500 shows a base station 502, a first UE 504A, and a second UE 504B. The base station 502 may exchange data and information with the first UE 504A on a first access channel or link (L1), and may exchange data and information with the second UE 504B on a second access channel or link (L2). Also shown is a first coverage area 510A corresponding to the first access channel (L1) and a second coverage area 510B corresponding to the second access channel (L2). In Figure 5AIn the example, the first UE 504A operates within the first coverage area 510A, and the second UE 504B operates within the second coverage area 510B (which is shown as including the first coverage area 510A). The access channels L1 and L2 can provide sufficient communication links between the base station 502 and the respective UEs 504A and 504B, or can provide a better communication link than the potential sidelink connection between the UEs 504A and 504B, and there may be no performance advantage associated with establishing a sidelink connection. Under these conditions, the first UE 504A can avoid establishing a sidelink connection with the second UE 504B.

[0092] Figure 5B Illustration 550 shows another example coverage area depicting a base station according to some embodiments. Illustration 550 depicts that the first UE 504A no longer operates within the first coverage area 510A, and depicts that the second UE 504B is no longer within the first coverage area 510A but remains within the second coverage area 510B. In some cases, when the first UE 504A is not operating within the first coverage area 510A, it may no longer have an RRC connection with the base station 502. For embodiments in which the first UE 504A is a Reduced Capability (RedCap) UE, a Bandwidth Reduced Low Complexity UE (BL UE), an eMTC device, or an NB-IoT device, the limited capabilities, reduced antenna size, and / or fewer number of antennas of the first UE 504A (such as relative to the second UE 504B) may cause the first UE 504A to fall outside its coverage area 510A while nearby UEs remain within their respective coverage areas.

[0093] According to some aspects of the present disclosure, the first UE 504A can use power measurements of DL transmissions from the base station 502 to determine whether a sidelink connection is likely to provide a better communication medium for the first UE 504A than the access channels (such as PDSCH, PDCCH, PUSCH, PUCCH, etc.) provided by the base station 502. In some cases, the first UE 504A can use the sidelink connection as a relay to exchange data and other information with the base station 502 via the second UE 504B. Additionally, or in an alternative, the first UE 504A can offload one or more processing functions to the second UE 504B.

[0094] The first UE 504A may also measure the CLI of other UEs 551–552 and use the measured CLI information to identify which of the other UEs 551-552 is most likely to provide the highest quality sidelink channel with the first UE 504A. In some cases, the first UE 504A may establish a sidelink connection with the identified other UE. In other cases, the first UE 504A may use one or more measurement metrics determined for each of the other UEs 551–552 to predict or estimate the quality of a potential sidelink connection with the corresponding one of the other UEs 551-552.

[0095] Figure 6B Sequence diagram 600 shows an example message exchange between a base station 602, a first UE 604A, and a second UE 604B that depicts support for establishing a sidelink channel according to some embodiments. The base station 602 may be Figure 1 an example of base station 102 or Figure 3 an example of base station 310, the first UE 604A may be Figure 1 an example of UE 104, Figure 3 an example of UE 350, or Figure 5A and Figure 5B an example of the first UE 504A, and the second UE 604B may be Figure 1 an example of UE 104, Figure 3 an example of UE 350, or Figure 5A and Figure 5B an example of the second UE 504B. In some cases, the first UE 604A and the second UE 604B may be served by the base station 602. In other cases, one of the first UE 604A and the second UE 604B may be served by the base station 602, and the other of the first UE 604A and the second UE 604B may be served by another base station (not shown for simplicity) associated with a cell or tracking area different from the base station 602.

[0096] The first UE 604A receives an inter-cell interference (CLI) measurement configuration carrying an identifier of the second UE 604B that uniquely identifies one or more CLI measurement procedures. In some cases, the first UE 604A may receive the CLI measurement configuration via RRC signaling. The first UE 604A determines an identifier of the second UE 604B, which may be used to address messages and signals to the second UE 604B. In some cases, the first UE 604A may use the identifier as the destination address of a ready-to-send (RTS) message, which may be used to establish a sidelink connection when sending to the second UE 604B. The second UE 604B may receive the RTS message and may send a clear-to-send (CTS) message to the first UE 604A. The CTS message may also notify other nearby wireless communication devices that the channel associated with the sidelink connection is busy. The sidelink channel may include a physical sidelink synchronization channel (PSSCH), a physical sidelink broadcast channel (PSBCH), or a physical sidelink control channel (PSCCH).

[0097] The CLI measurement configuration may also indicate CLI measurement resources on which the first UE 604A will measure the CLI associated with UL transmissions from the second UE 604B. For example, the CLI measurement configuration may indicate the periodicity, offset, number of RBs, or number of OFDM symbols corresponding to the indicated CLI measurement resources. In some cases, the second UE 604B may also receive the CLI measurement configuration, or at least receive an indication of the CLI measurement resources on which the second UE 604B will transmit CLI measurement signals.

[0098] As discussed, the identifier may be any suitable identifier or value that the first UE 604A can use to address messages or signals to the second UE 604B. For example, the identifier may be a UE ID assigned to the second UE 604B by a core network (not shown for simplicity) associated with the base station 602. In some cases, the CLI measurement configuration carries a mapping between the UE ID of the second UE 604B and a cell radio network temporary identifier (C-RNTI), a temporary mobile station identifier (TMSI), an international mobile subscriber identity (IMSI), a media access control (MAC) address, or another suitable identity or address assigned to or otherwise associated with the second UE 604B.

[0099] The second UE 604B transmits a CLI measurement signal on one or more CLI measurement resources (such as indicated by a CLI measurement configuration). The CLI measurement resources may be configured to occupy multiple time slots, RBs, and / or OFDM symbols of the base station 602 for DL transmission to the first UE 604A. For example, such that the first UE 604A receives the CLI measurement signal while concurrently receiving at least a portion of the DL transmission from the base station 602.

[0100] The first UE 604A receives the CLI measurement signal and determines a measurement metric of the received CLI measurement signal. The measurement metric may be one or more of the reference signal received power (RSRP), reference signal received quality (RSRQ), received signal strength indicator (RSSI), signal-to-noise ratio (SNR), or signal-to-interference plus noise ratio (SINR) of the CLI measurement signal. In some aspects, the first UE 604A may determine the SINR of a signal or transmission according to procedures specified in one or more 3GPP releases. In some cases, the measurement metric may be the RSRP or RSRQ of a UL reference signal (e.g., sounding reference signal (SRS), uplink demodulation reference signal (DM-RS), or channel state information (CSI) reference signal (CSI-RS)). The SRS signal may be a set of SRS resources, and the UL DMRS signal may be a set of DM-RS resources. If the RSRP measurement is configured by the CLI measurement configuration, the CLI measurement configuration may also indicate the SRS resources to be measured by the first UE 604A. In other cases, the measurement metric may be the RSSI value of the CLI measurement signal.

[0101] The first UE 604A may selectively establish a sidelink connection with the second UE 604B using the identifier carried in the CLI measurement configuration, at least in part based on the determined measurement metric of the CLI measurement signal. In some cases, when the determined measurement metric is greater than a value, the first UE 604A uses the identifier to establish a sidelink connection with the second UE 604B, and when the measurement metric of the CLI measurement signal is not greater than the value, does not establish (or avoids establishing) a sidelink connection with the second UE 604B.

[0102] According to some aspects of the present disclosure, the selection or determination of the value may ensure that the signal strength, signal quality, and / or channel conditions of the sidelink connection to be established with the second UE 604B are greater than or better than a threshold. The threshold may be selected to have a value such that the first UE 604A can ensure (or at least increase the likelihood) that the sidelink connection with the second UE 604B provides better coverage, higher throughput, lower latency, and / or higher signal quality than the UL access channel (such as PUSCH) to the base station 602.

[0103] In some cases, the first UE 604A may determine that the second UE 604B is within a distance of the first UE 604A based on the measurement metric of the signal measured based on the CLI being greater than this value. The first UE 604A may also determine that the second UE 604B is at a distance greater than a distance from the first UE 604A based on the measurement metric of the signal measured based on the CLI not being greater than this value. For example, when the RSRP, RSRQ, or RSSI of the CLI measurement signal received from the second UE 604B is relatively high (such as greater than this value), the second UE 604B is likely to be relatively close to the first UE 604A (such as within this distance of it). Conversely, when the RSRP, RSRQ, or RSSI of the CLI measurement signal received from the second UE 604B is relatively low (such as less than this value), the second UE 604B is likely to be relatively far from the first UE 604A (such as greater than this distance).

[0104] Once established, the sidelink connection between the first UE 604A and the second UE 604B can be used for any number of suitable functions or purposes. For example, in some cases, the first UE 604A may use the sidelink connection as a relay connection, through which the first UE 604A can use the second UE 604B as a relay or proxy device to send data to and / or receive data from the base station 602. In this way, establishing a sidelink connection with the second UE 604B can effectively extend the coverage area provided by the base station 602 for the first UE 604A. For example, as Figure 5B shown, the second UE 504B can relay communications between the base station 502 and the first UE 504A (which is outside the coverage area of the base station 502) through the sidelink connection.

[0105] Figure 6B Shows a sequence diagram 650 depicting an example message exchange between a base station 602, a first UE 604A, and a second UE 604B that supports the establishment of a sidelink channel according to some other embodiments. Figure 6B The message exchange of can be used by the first UE 604A to selectively establish a sidelink connection with the second UE 604B based on the presence of a DL channel or a CLI on a transmission.

[0106] The first UE 604A receives a CLI measurement configuration carrying an identifier that uniquely identifies the second UE 604B for one or more CLI measurement procedures. As discussed, the CLI measurement configuration may also indicate the CLI measurement resources on which the second UE 604B sends the CLI measurement signal, and the CLI measurement resources on which the first UE 604A measures the CLI caused by UL transmissions from the second UE 604B. The second UE 604B can identify the CLI measurement resources from the CLI measurement configuration or from other suitable signaling.

[0107] The first UE 604A determines an identifier of the second UE 604B, which, as discussed, can be used to address messages and signals to the second UE 604. The first UE 604A receives a DL transmission from the base station 602 on a DL channel. The first UE 604A detects the presence of a CLI on the DL channel caused by a UL transmission from the second UE 604B. The DL channel can be any suitable physical or logical access channel (such as a PDSCH). The UL transmission can include a signal sent by the second UE 604B according to the CLI measurement configuration, as described in the sequence diagram 600 of the reference Figure 6A as described. In some cases, the UL transmission can carry one or more reference signals based on which measurement metrics can be determined.

[0108] The first UE 604A determines one or more dedicated resources associated with the second UE 604B at least in part based on the determined identifier. As discussed, the identifier can be any suitable identifier or value that the first UE 604A can use to address a message or signal to the second UE 604B. In some cases, the identifier can be a UE ID. Additionally, or in an alternative, the CLI measurement configuration can carry a mapping between the UE ID and a C-RNTI, TMSI, IMSI, or MAC address assigned to or otherwise associated with the second UE 604B.

[0109] The first UE 604A can use the identifier determined from the CLI measurement configuration to establish a sidelink connection with the second UE 604B on one or more dedicated resources. In some embodiments, when the measurement metric of the DL channel is less than a value, the first UE 604A establishes a sidelink connection with the second UE 604B, and when the measurement metric of the DL channel is not less than the value, it does not establish (or avoids establishing) a sidelink connection with the second UE 604B. As discussed, the measurement metric can be one or more of RSRP, RSRQ, RSSI, SNR, or SINR of the CLI measurement signal. The selection or determination of the value can ensure that the signal strength, signal quality, and / or channel conditions of the sidelink connection to be established with the second UE 604B provide better coverage, higher throughput, lower latency, and / or higher signal quality than the UL channel between the first UE 604A and the base station 602.

[0110] In other embodiments, the first UE 604A establishes a sidelink connection with the second UE 604B when the power consumption associated with sending data to the second UE 604B via a sidelink connection is less than the power consumption associated with sending data to the base station 602 (on the UL access channel) by at least a value. When the power consumption associated with sending data to the second UE 604B is not less than the power consumption associated with sending data to the base station 602 by at least this value, the first UE 604A may avoid establishing a sidelink connection with the second UE 604B. The selection or determination of this value can ensure that the signal strength, signal quality, and / or channel conditions of the sidelink connection to be established with the second UE 604B provide better coverage, higher throughput, lower latency, and / or higher signal quality than the UL channel between the first UE 604A and the base station 602.

[0111] Figure 7 FIG. 700 is a flow chart depicting an example operation 700 for supporting the establishment of a sidelink channel for wireless communication in accordance with some embodiments. Operation 700 may be performed by a wireless communication device, such as Figure 1 UE 104, Figure 3 UE 350, Figure 5A and Figure 5B the first UE 504A of Figure 6A and Figure 6B the first UE 604A of

[0112] At block 702, the first UE 604A receives a CLI measurement configuration carrying an identifier of the second UE that uniquely identifies the second UE for cross-link interference (CLI) measurement. At block 704, the first UE 604A selectively establishes a sidelink connection with the second UE 604B using the identifier carried in the CLI measurement configuration. In some cases, the CLI measurement configuration may be received via a radio resource control (RRC) configuration. In some other instances, the CLI measurement configuration may be received in a DL message, e.g., a downlink control information (DCI) message.

[0113] The identifier can be any suitable identifier, address, or value that the first UE 604A can use to address a message or signal to the second UE 604B to establish a sidelink connection. In some embodiments, the identifier can be a User Equipment Identifier (UE ID). In some cases, the CLI measurement configuration can carry a mapping between the UE ID and at least one of a Cell Radio Network Temporary Identifier (C-RNTI), a Temporary Mobile Station Identifier (TMSI), an International Mobile Subscriber Identity (IMSI), or a Media Access Control (MAC) address assigned to the second UE 604B. The CLI measurement configuration can also indicate one or more CLI measurement resources on which the first UE 604A will measure the CLI associated with UL transmissions from the second UE 604B.

[0114] Figure 8 A flowchart showing an example operation 800 for supporting wireless communication for establishing a sidelink channel according to some embodiments is shown. Operation 800 can be performed by a wireless communication device, such as Figure 1 UE 104, Figure 3 UE 350, Figure 5A and Figure 5B the first UE 504A of Figure 6A and Figure 6B the first UE 604A of

[0115] In some embodiments, operation 800 can be an example of selectively establishing a sidelink connection in block 704 of Figure 7 For example, at block 802, the first UE 604A receives a CLI measurement signal from the second UE 604B on one or more indicated CLI measurement resources. At block 804, the first UE 604A determines a measurement metric of the received CLI measurement signal. At block 806, the first UE 604A determines whether to establish a sidelink connection with the second UE 604B based on the determined measurement metric relative to a value.

[0116] The CLI measurement signal can be received according to the CLI measurement configuration. In some cases, the CLI measurement configuration can indicate one or more of a period, an offset, a number of RBs, or a number of OFDM symbols corresponding to the CLI measurement resources on which the second UE 604B transmits the CLI measurement signal.

[0117] The measurement metric can be any suitable metric, value, or characteristic based on which the first UE 604A can determine the strength or quality of the CLI measurement signal transmitted by the second UE 604B. In some cases, the measurement metric can be RSRP or RSRQ, and the reference signal can be SRS, DMRS, or CSI-RS. For example, in some embodiments, the CLI measurement configuration can indicate a reference signal received power type measurement CLI procedure, and the CLI measurement signal can include one or more SRS resource sets or DM-RS resource sets. In other cases, the measurement metric can be a received power measurement, such as the RSSI of the CLI measurement signal. In some other cases, the measurement metric can be an interference measurement, such as SNR or SINR.

[0118] Figure 9 A flowchart showing an example operation 900 for supporting the establishment of a sidelink channel for wireless communication according to some embodiments is shown. Operation 900 can be performed by a wireless communication device, such as Figure 1 UE 104, Figure 3 UE 350, Figure 5A and Figure 5B the first UE 504A of Figure 6A and Figure 6B the first UE 604A of

[0119] In some embodiments, operation 900 can be an example of determining whether to establish a sidelink connection in block 806 of Figure 8 . For example, at block 902, the first UE 604A determines whether the measurement metric of the received CLI measurement signal is greater than the value. If the measurement metric is greater than the value, then at block 904, the first UE 604A establishes a sidelink connection with the second UE 604B. In some cases, at block 906, the first UE 604A can determine that the second UE 604B is within a distance of the first UE 604A based on the determined CLI measurement metric being greater than the value. Conversely, if the measurement metric is not greater than the value, then at block 908, the first UE 604A can avoid establishing a sidelink connection with the second UE. In some cases, at block 910, the first UE 604A can determine that the second UE 604B is greater than a distance from the first UE 604B based on the determined CLI measurement metric not being greater than the value.

[0120] Figure 10A flow chart depicting example operations 1000 for supporting wireless communications to establish a sidelink channel in accordance with some embodiments is shown. Operations 1000 may be performed by a wireless communications device, such as Figure 1 UE 104, Figure 3 UE350, Figure 5A and Figure 5B The first UE 504A or Figure 6A and Figure 6B Although described with reference to the first UE 604A, the operations 1000 may be performed by other suitable wireless communication devices in conjunction with other suitable UEs, base stations, access nodes, TRPs, or network entities.

[0121] In some implementations, operation 1000 may be performed in Figure 7 1004, the first UE 604A selectively establishes a sidelink connection in block 704 of the present invention. For example, at block 1002, the first UE 604A detects a CLI on a downlink (DL) channel caused by an uplink (UL) transmission from a second UE 604B. At block 1004, in response to detecting the CLI on the DL channel, the first UE 604A determines one or more dedicated resources associated with the second UE 604B based at least in part on an identifier. At block 1006, the first UE 604A establishes a sidelink connection with the second UE 604B on the one or more dedicated resources.

[0122] In some cases, detecting the presence of CLI on the DL channel may trigger the first UE 604A to establish a sidelink connection with the second UE 604B. In some other cases, for example, as shown in FIG. Figure 11 and Figure 12 As described above, the first UE 604A may establish a sidelink connection with the second UE 604B based on a measurement metric of a DL channel or a transmission power consumption metric of the first UE 604A (or both).

[0123] Figure 11 A flow chart depicting example operations 1100 for supporting wireless communications to establish a sidelink channel in accordance with some embodiments is shown. Operations 1100 may be performed by a wireless communications device, such as Figure 1 UE 104, Figure 3 UE350, Figure 5A and Figure 5B The first UE 504A or Figure 6A and Figure 6B Although described with reference to the first UE 604A, the operations 1100 may be performed by other suitable wireless communication devices in conjunction with other suitable UEs, base stations, access nodes, TRPs, or network entities.

[0124] In some embodiments, operation 1100 can be an example of establishing a sidelink connection in Figure 10 box 1006. For example, at box 1102, the first UE 604A determines whether a measurement metric of the DL channel is less than a value. If the DL channel measurement metric is less than the value, then at box 1104, the first UE 604A can establish a sidelink connection with the second UE. Conversely, if the DL channel measurement metric is not less than the value, then at box 1106, the first UE 604A can avoid establishing a sidelink connection with the second UE. The measurement metric of the DL channel can be the RSRP or RSRQ of the DL reference signal, the RSSI value of the DL transmission, or the SNR or SINR of the DL channel. In some cases, the DL channel can be the physical downlink shared channel (PDSCH). In other cases, the DL channel can be the physical downlink control channel (PDCCH).

[0125] Figure 12 A flowchart showing an example operation 1200 for supporting wireless communication for establishing a sidelink channel according to some embodiments is shown. Operation 1200 can be performed by a wireless communication device, such as Figure 1 UE 104 of Figure 3 UE350 of Figure 5A and Figure 5B the first UE 504A of Figure 6A and Figure 6B the first UE 604A of

[0126] In some embodiments, operation 1200 can be another example of establishing a sidelink connection in Figure 10 box 1006. For example, at box 1202, the first UE 604A determines whether the power consumption associated with transmitting data to the second UE 604B via a sidelink connection is less than the power consumption associated with transmitting data to the base station on the UL channel by at least a value. If the power consumption associated with data transmission to the second UE 604B is less than the power consumption associated with data transmission to the base station by at least that value, then at box 1204, the first UE 604A can establish a sidelink connection with the second UE 604B. Conversely, if the power consumption associated with data transmission to the second UE 604B is not less than the power consumption associated with data transmission to the base station by at least that value, then at box 1206, the first UE 604A can avoid establishing a sidelink connection with the second UE 604.

[0127] Figure 13FIG. shows a block diagram of an example wireless communication device 1300 according to some embodiments. The wireless communication device 1300 can be any suitable device capable of transmitting or receiving wireless signals according to one or more forms, versions, or modifications of wireless communication standards or protocols. In some embodiments, the wireless communication device 1300 can be Figure 1 UE 104 of Figure 3 UE 350 of Figure 5A and Figure 5B a first UE 504A of Figure 6A and Figure 6B a first UE 604A of

[0128] The wireless communication device 1300 includes a receiving component 1310, a communication manager 1320, and a transmitting component 1330. The communication manager 1320 can include a CLI detection component 1322, a measurement metric determination component 1324, and a sidelink connection component 1326. Portions of one or more of the components 1322, 1324, and 1326 can be implemented at least in part in hardware or firmware. In some embodiments, at least one of the components 1322, 1324, or 1326 is implemented at least in part as software stored in a memory (such as memory 360). For example, portions of one or more of the components 1322, 1324, and 1326 can be implemented as non-transitory instructions or code executable by a processor (such as processor 359) to perform the functions or operations of the corresponding components.

[0129] The receiving component 1310 is configured to receive CLI measurement configurations, CLI measurement signals, DL transmissions, reference signals, sidelink connection establishment messages, or other suitable signaling associated with Figure 1 the wireless communication system 100. The communication manager 1320 is configured to selectively establish a sidelink connection with another second UE using the identifier carried in the CLI measurement configuration. The measurement metric determination component 1324 can be used to measure one or more measurement metrics, such as reference signal received power (RSRP), reference signal received quality (RSRQ), received signal strength indicator (RSSI), signal-to-noise ratio (SNR), or signal-to-interference plus noise ratio (SINR). The sidelink connection establishment component 1326 can be configured to establish a sidelink connection with another UE. The TX signal can include (but is not limited to) UL transmissions to a base station, or peer-to-peer transmissions on a sidelink connection or channel.

[0130] As used herein, the phrase "at least one" in reference to a list of items refers to any combination of those items, including a single member. For example, "at least one of a, b, or c" is intended to cover: a, b, c, a - b, a - c, b - c, and a - b - c.

[0131] The various illustrative logical, logical blocks, modules, circuits, and algorithmic processes described in connection with the embodiments disclosed herein can be implemented as electronic hardware, computer software, or a combination of both. The interchangeability of hardware and software has been generally described in functional terms and illustrated in the various illustrative components, blocks, modules, circuits, and processes described above. Whether such functionality is implemented as hardware or software depends upon the particular application and the design constraints imposed on the overall system.

[0132] The hardware and data processing apparatus for implementing the various illustrative logics, logical blocks, modules, and circuits described in connection with the aspects disclosed herein can be implemented or performed with a general - purpose single - chip or multi - chip processor, a 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 herein. A general - purpose processor can be a microprocessor, or any conventional processor, controller, microcontroller, or state machine. The processor can also be implemented as a combination of computing devices (such as 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. In some embodiments, the particular processes and methods can be performed by circuitry specific to a given function.

[0133] In one or more aspects, the described functionality can be implemented in hardware, digital electronic circuits, computer software, firmware, including the structures disclosed in this specification and their structural equivalents, or any combination thereof. Embodiments of the subject matter described in this specification can also be implemented as one or more computer programs, i.e., one or more modules of computer program instructions, encoded on a computer storage medium for execution by, or to control the operation of, a data processing apparatus.

[0134] If implemented in software, the functions may be stored on or transmitted via a computer-readable medium as one or more instructions or code. The processes of the methods or algorithms disclosed herein may be implemented as a software module executable by a processor, which may reside on a computer-readable medium. A computer-readable medium includes both a computer storage medium and a communication medium including any medium that can transfer a computer program from one place to another. The storage medium may be any available medium that can be accessed by a computer. By way of example, and not limitation, such computer-readable medium can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired program code in the form of instructions or data structures and that can be accessed by a computer. Additionally, any connection is properly termed a computer-readable medium. As used herein, disks and discs include compact disc (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 should also be included within the scope of computer-readable medium. Additionally, operations of a method or algorithm may reside as one or any combination or set of codes and instructions on a machine-readable medium and a computer-readable medium, which may be incorporated into a computer program product.

[0135] Various modifications to the described embodiments in this disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the claims are not intended to be limited to the embodiments shown herein but are to be accorded the widest scope consistent with the disclosure, the principles disclosed herein, and the novel features.

[0136] The following are further examples of innovative aspects included in this disclosure:

[0137] 1. A method for wireless communication performed by a first user equipment (UE), comprising:

[0138] receiving a CLI measurement configuration carrying an identifier of a second UE for cross-link interference (CLI) measurement; and

[0139] selectively establishing a sidelink connection with the second UE using the identifier carried in the CLI measurement configuration.

[0140] 2. The method according to example 1, wherein the CLI measurement configuration is received via radio resource control (RRC) configuration.

[0141] 3. The method according to any one of the foregoing examples, wherein the identifier includes a user equipment identifier (UE ID).

[0142] 4. The method according to any one of the foregoing examples, wherein the CLI measurement configuration carries a mapping between the UE ID and at least one of a cell radio network temporary identifier (C-RNTI), a temporary mobile station identifier (TMSI), an international mobile subscriber identity (IMSI), or a media access control (MAC) address.

[0143] 5. The method according to any one of the foregoing examples, wherein the CLI measurement configuration indicates one or more CLI measurement resources on which to measure the CLI associated with an uplink (UL) transmission from a second UE.

[0144] 6. The method according to any one of the foregoing examples, wherein selectively establishing a sidelink connection includes:

[0145] Receiving a CLI measurement signal from the second UE on one or more indicated CLI measurement resources;

[0146] Determining a measurement metric of the received CLI measurement signal; and

[0147] Determining whether to establish the sidelink connection with the second UE based on the determined measurement metric of the received CLI measurement signal relative to a value.

[0148] 7. The method according to any one of the foregoing examples, wherein the measurement metric includes at least one of a reference signal received power (RSRP), a reference signal received quality (RSRQ), a received signal strength indicator (RSSI), a signal-to-noise ratio (SNR), or a signal-to-interference plus noise ratio (SINR).

[0149] 8. The method according to any one of the foregoing examples, wherein the CLI measurement configuration further indicates one or more of a periodicity, an offset, a number of resource blocks (RBs), or a number of orthogonal frequency division multiplexing (OFDM) symbols corresponding to the transmission of the CLI measurement signal on one or more indicated CLI measurement resources.

[0150] 9. The method according to any one of the foregoing examples, wherein the CLI measurement signal is received according to the CLI measurement configuration.

[0151] 10. The method according to any one of the foregoing examples, wherein the CLI measurement signal includes one of a sounding reference signal (SRS), an uplink demodulation reference signal (DM-RS), or a channel state information (CSI) reference signal (CSI-RS).

[0152] 11. The method according to any one of the foregoing examples, wherein the CLI measurement configuration indicates a reference signal received power type measurement CLI procedure, and the CLI measurement signal includes one or more sounding reference signal (SRS) resource sets or demodulation reference signal (DM-RS) resource sets.

[0153] 12. The method according to any one of the foregoing examples, wherein the CLI measurement configuration identifies one or more SRS resource sets or DMRS resource sets.

[0154] 13. The method according to any one of the foregoing examples, wherein the determined measurement metric indicates the proximity of the first UE to the second UE.

[0155] 14. The method according to any one of the foregoing examples, wherein determining whether to establish a sidelink connection includes:

[0156] Establishing a sidelink connection with the second UE based on the determined measurement metric of the received CLI measurement signal being greater than a value.

[0157] 15. The method according to any one of the foregoing examples, further comprising:

[0158] Determining that the second UE is within a distance of the first UE based on the determined measurement metric being greater than the value.

[0159] 16. The method according to any one of the foregoing examples, wherein determining whether to establish a sidelink connection includes:

[0160] Avoiding establishing a sidelink connection with the second UE based on the determined measurement metric of the received CLI measurement signal being less than a value.

[0161] 17. The method according to any one of the foregoing examples, further comprising:

[0162] Determining that the second UE is at a distance greater than a distance from the first UE based on the determined measurement metric being less than the value.

[0163] 18. The method according to any one of the foregoing examples, wherein selectively establishing a sidelink connection includes:

[0164] Detecting a CLI on a downlink (DL) channel caused by an uplink (UL) transmission from the second UE;

[0165] Responsive to detecting the CLI on the DL channel, determining one or more dedicated resources associated with the second UE based at least in part on an identifier; and

[0166] Establishing a sidelink connection with the second UE on one or more dedicated resources.

[0167] 19. The method according to any one of the foregoing examples, wherein establishing a sidelink connection further comprises:

[0168] Based on a measurement metric of a DL channel being less than a value, establishing a sidelink connection with a second UE on one or more dedicated resources; or

[0169] Based on the measurement metric of the DL channel being greater than the value, avoiding establishing a sidelink connection with the second UE.

[0170] 20. The method according to any one of the foregoing examples, wherein the measurement metric comprises at least one of reference signal received power (RSRP), reference signal received quality (RSRQ), received signal strength indicator (RSSI), signal-to-noise ratio (SNR), or signal-to-interference plus noise ratio (SINR).

[0171] 21. The method according to any one of the foregoing examples, wherein establishing a sidelink connection further comprises:

[0172] Based on the power consumption associated with transmitting data to a second UE via a sidelink connection being less than the power consumption associated with transmitting data to a base station on a UL channel by at least a value, establishing a sidelink connection with the second UE on one or more dedicated resources; or

[0173] Based on the power consumption associated with transmitting data to a second UE via a sidelink connection being not less than the power consumption associated with transmitting data to a base station on a UL channel by at least the value, avoiding establishing a sidelink connection with the second UE.

[0174] 22. The method according to any one of the foregoing examples, wherein the identifier is at least partially based on a correlation between the identifier and one or more operating parameters of a dedicated resource or channel.

[0175] 23. A first user equipment (UE), comprising:

[0176] At least one modem;

[0177] At least one processor communicatively coupled to the at least one modem; and

[0178] At least one memory communicatively coupled to the at least one processor and storing instructions that, when executed by the at least one processor in combination with the at least one modem, cause the first UE to perform operations comprising:

[0179] Receiving a CLI measurement configuration carrying an identifier of a second UE for cross-link interference (CLI) measurement; and

[0180] Selectively establishing a sidelink connection with the second UE using the identifier carried in the CLI measurement configuration.

[0181] 24. The first UE according to Example 23, wherein the CLI measurement configuration is received via radio resource control (RRC) configuration.

[0182] 25. The first UE according to any one of the preceding Examples 23–24, wherein the identifier includes a user equipment identifier (UE ID).

[0183] 26. The first UE according to any one of the preceding Examples 23–25, wherein the CLI measurement configuration carries a mapping between the UE ID and at least one of a cell radio network temporary identifier (C-RNTI), a temporary mobile station identifier (TMSI), an international mobile subscriber identity (IMSI), or a media access control (MAC) address.

[0184] 27. The first UE according to any one of the preceding Examples 23–26, wherein the CLI measurement configuration indicates one or more CLI measurement resources on which to measure the CLI associated with an uplink (UL) transmission from a second UE.

[0185] 28. The first UE according to any one of the preceding Examples 23–27, wherein executing the instruction to establish a sidelink connection causes the first UE to:

[0186] Receive a CLI measurement signal from the second UE on one or more indicated CLI measurement resources;

[0187] Determine a measurement metric of the received CLI measurement signal; and

[0188] Determine whether to establish a sidelink connection with the second UE based on the determined measurement metric of the received CLI measurement signal relative to a value.

[0189] 29. The first UE according to any one of the preceding Examples 23–28, wherein the measurement metric includes at least one of a reference signal received power (RSRP), a reference signal received quality (RSRQ), a received signal strength indicator (RSSI), a signal-to-noise ratio (SNR), or a signal-to-interference plus noise ratio (SINR).

[0190] 30. The first UE according to any one of the preceding Examples 23–29, wherein the CLI measurement configuration further indicates one or more of a periodicity, an offset, a number of resource blocks (RBs), or a number of orthogonal frequency division multiplexing (OFDM) symbols corresponding to the transmission of the CLI measurement signal on one or more indicated CLI measurement resources.

[0191] 31. The first UE according to any one of the preceding Examples 23–30, wherein the CLI measurement signal is received according to the CLI measurement configuration.

[0192] 32. The first UE according to any one of the foregoing examples 23–31, wherein the CLI measurement signal includes one of a sounding reference signal (SRS), an uplink demodulation reference signal (DM-RS), or a channel state information (CSI) reference signal (CSI-RS).

[0193] 33. The first UE according to any one of the foregoing examples 23–32, wherein the CLI measurement configuration indicates a reference signal received power type measurement CLI procedure, and the CLI measurement signal includes one or more sounding reference signal (SRS) resource sets or demodulation reference signal (DM-RS) resource sets.

[0194] 34. The first UE according to any one of the foregoing examples 23–33, wherein the CLI measurement configuration identifies one or more SRS resource sets or DMRS resource sets.

[0195] 35. The first UE according to any one of the foregoing examples 23–34, wherein the determined measurement metric indicates the proximity of the first UE to the second UE.

[0196] 36. The first UE according to any one of the foregoing examples 23–35, wherein executing the instruction for determining whether to establish a sidelink connection causes the first UE to:

[0197] Establish a sidelink connection with the second UE based on the determined measurement metric of the received CLI measurement signal being greater than a value.

[0198] 37. The first UE according to any one of the foregoing examples 23–36, wherein executing the instruction causes the first UE to perform an operation that further includes the following operations:

[0199] Determine that the second UE is within a distance of the first UE based on the determined measurement metric being greater than the value.

[0200] 38. The first UE according to any one of the foregoing examples 23–37, wherein executing the instruction for determining whether to establish a sidelink connection further causes the first UE to:

[0201] Avoid establishing a sidelink connection with the second UE based on the determined measurement metric of the received CLI measurement signal being less than a value.

[0202] 39. The first UE according to any one of the foregoing examples 23–38, wherein executing the instruction causes the first UE to perform an operation that further includes the following operations:

[0203] Determine that the second UE is greater than a distance from the first UE based on the determined measurement metric being less than the value.

[0204] 40. The first UE according to any one of the foregoing examples 23–39, wherein executing the instructions for selectively establishing a sidelink connection causes the first UE to:

[0205] Detect a CLI on a downlink (DL) channel caused by an uplink (UL) transmission from a second UE;

[0206] In response to detecting the CLI on the DL channel, determine one or more dedicated resources associated with the second UE based at least in part on an identifier; and

[0207] Establish a sidelink connection with the second UE on the one or more dedicated resources.

[0208] 41. The first UE according to any one of the foregoing examples 23–40, wherein executing the instructions for establishing a sidelink connection causes the first UE to:

[0209] Establish a sidelink connection with the second UE on one or more dedicated resources based on a measurement metric of the DL channel being less than a value; or

[0210] Avoid establishing a sidelink connection with the second UE based on the measurement metric of the DL channel being greater than the value.

[0211] 42. The first UE according to any one of the foregoing examples 23–41, wherein the measurement metric includes at least one of reference signal received power (RSRP), reference signal received quality (RSRQ), received signal strength indicator (RSSI), signal-to-noise ratio (SNR), or signal-to-interference plus noise ratio (SINR).

[0212] 43. The first UE according to any one of the foregoing examples 23–42, wherein executing the instructions for establishing a sidelink connection causes the first UE to:

[0213] Establish a sidelink connection with the second UE on one or more dedicated resources based on the power consumption associated with sending data to the second UE via the sidelink connection being less than the power consumption associated with sending data to a base station on the UL channel by at least a value; or

[0214] Avoid establishing a sidelink connection with the second UE based on the power consumption associated with sending data to the second UE via the sidelink connection being not less than the power consumption associated with sending data to a base station on the UL channel by at least the value.

[0215] 44. The first UE according to any one of the foregoing examples 23–43, wherein the identifier is based at least in part on a correlation between the identifier and one or more operating parameters of a dedicated resource or a channel.

[0216] 45. A first user equipment (UE) comprising:

[0217] A component for receiving a CLI measurement configuration that carries an identifier of a second UE for cross-link interference (CLI) measurement; and

[0218] A component for selectively establishing a sidelink connection with the second UE using the identifier carried in the CLI measurement configuration.

[0219] 46. The first UE according to example 45, wherein the CLI measurement configuration is received via radio resource control (RRC) configuration.

[0220] 47. The first UE according to any one of the preceding examples 45–46, wherein the identifier includes a user equipment identifier (UE ID).

[0221] 48. The first UE according to any one of the preceding examples 45–47, wherein the CLI measurement configuration carries a mapping between the UE ID and at least one of a cell radio network temporary identifier (C-RNTI), a temporary mobile station identifier (TMSI), an international mobile subscriber identity (IMSI), or a media access control (MAC) address.

[0222] 49. The first UE according to any one of the preceding examples 45–48, wherein the CLI measurement configuration indicates one or more CLI measurement resources on which to measure the CLI associated with an uplink (UL) transmission from the second UE.

[0223] 50. The first UE according to any one of the preceding examples 45–49, wherein the component for selectively establishing a sidelink connection will:

[0224] Receive a CLI measurement signal from the second UE on one or more indicated CLI measurement resources;

[0225] Determine a measurement metric of the received CLI measurement signal; and

[0226] Determine whether to establish a sidelink connection with the second UE based on the determined measurement metric of the received CLI measurement signal relative to a value.

[0227] 51. The first UE according to any one of the preceding examples 45–50, wherein the measurement metric includes at least one of a reference signal received power (RSRP), a reference signal received quality (RSRQ), a received signal strength indicator (RSSI), a signal-to-noise ratio (SNR), or a signal-to-interference-plus-noise ratio (SINR).

[0228] 52. The first UE according to any one of the foregoing examples 45–51, wherein the CLI measurement configuration further indicates one or more of a periodicity, an offset, a number of resource blocks (RBs), or a number of orthogonal frequency division multiplexing (OFDM) symbols corresponding to transmitting a CLI measurement signal on one or more indicated CLI measurement resources.

[0229] 53. The first UE according to any one of the foregoing examples 45–52, wherein the CLI measurement signal is received according to the CLI measurement configuration.

[0230] 54. The first UE according to any one of the foregoing examples 45–53, wherein the CLI measurement signal includes one of a sounding reference signal (SRS), an uplink demodulation reference signal (DM-RS), or a channel state information (CSI) reference signal (CSI-RS).

[0231] 55. The first UE according to any one of the foregoing examples 45–54, wherein the CLI measurement configuration indicates a reference signal received power type measurement CLI procedure, and the CLI measurement signal includes one or more sounding reference signal (SRS) resource sets or demodulation reference signal (DM-RS) resource sets.

[0232] 56. The first UE according to any one of the foregoing examples 45–55, wherein the CLI measurement configuration identifies one or more SRS resource sets or DMRS resource sets.

[0233] 57. The first UE according to any one of the foregoing examples 45–56, wherein the determined measurement metric indicates the proximity of the first UE to the second UE.

[0234] 58. The first UE according to any one of the foregoing examples 45–57, wherein the component for determining whether to establish a sidelink connection will:

[0235] Establish a sidelink connection with the second UE based on the determined measurement metric of the received CLI measurement signal being greater than a value.

[0236] 59. The first UE according to any one of the foregoing examples 45–58, further comprising:

[0237] A component for determining that the second UE is within a distance of the first UE based on the determined measurement metric being greater than the value.

[0238] 60. The first UE according to any one of the foregoing examples 45–59, wherein the component for determining whether to establish a sidelink connection will:

[0239] Avoid establishing a sidelink connection with the second UE based on the determined measurement metric of the received CLI measurement signal being less than a value.

[0240] The first UE according to any one of the foregoing examples 45–60 further comprises:

[0241] A component for determining that a second UE is at a distance greater than a certain distance from the first UE based on the determined measurement metric being less than this value.

[0242] The first UE according to any one of the foregoing examples 45–61, wherein the component for selectively establishing a sidelink connection will:

[0243] Detect a CLI on a downlink (DL) channel caused by an uplink (UL) transmission from a second UE;

[0244] In response to detecting a CLI on the DL channel, determine one or more dedicated resources associated with the second UE at least partly based on an identifier; and

[0245] Establish a sidelink connection with the second UE on one or more dedicated resources.

[0246] The first UE according to any one of the foregoing examples 45–62, wherein the component for establishing a sidelink connection will further:

[0247] Based on the measurement metric of the DL channel being less than a value, establish a sidelink connection with the second UE on one or more dedicated resources; or

[0248] Based on the measurement metric of the DL channel being greater than this value, avoid establishing a sidelink connection with the second UE.

[0249] The first UE according to any one of the foregoing examples 45–63, wherein the measurement metric includes at least one of reference signal received power (RSRP), reference signal received quality (RSRQ), received signal strength indicator (RSSI), signal-to-noise ratio (SNR), or signal-to-interference plus noise ratio (SINR).

[0250] The first UE according to any one of the foregoing examples 45–64, wherein the component for establishing a sidelink connection will further:

[0251] Based on the power consumption associated with sending data to the second UE via a sidelink connection being less than the power consumption associated with sending data to a base station on an UL channel by at least a certain value, establish a sidelink connection with the second UE on one or more dedicated resources; or

[0252] Based on the power consumption associated with sending data to the second UE via a sidelink connection being not less than the power consumption associated with sending data to a base station on an UL channel by at least this value, avoid establishing a sidelink connection with the second UE.

[0253] The first UE according to any one of the foregoing examples 45–65, wherein the identifier is at least partially based on a correlation between the identifier and one or more operating parameters of a dedicated resource or channel.

Claims

1. A method for wireless communication to be performed at a first user equipment (UE), comprising: receiving a cross-link interference (CLI) measurement configuration carrying an identifier of a second UE uniquely identifying the second UE for CLI measurement; selectively establishing a sidelink connection with the second UE using the identifier carried in the CLI measurement configuration; and after establishing the sidelink connection with the second UE, using the sidelink connection as a relay connection via which the first UE can use the second UE as a relay or proxy device to send data to and / or receive data from a network entity.

2. The method according to claim 1, wherein the CLI measurement configuration is received via radio resource control (RRC) configuration.

3. The method according to claim 1, wherein the identifier includes a user equipment identifier (UE ID).

4. The method according to claim 3, wherein the CLI measurement configuration carries a mapping between the UE ID and at least one of a cell radio network temporary identifier (C-RNTI), a temporary mobile station identifier (TMSI), an international mobile subscriber identity (IMSI), or a media access control (MAC) address.

5. The method according to claim 1, wherein the CLI measurement configuration indicates one or more CLI measurement resources on which to measure the CLI associated with an uplink (UL) transmission from the second UE.

6. The method according to claim 5, wherein selectively establishing the sidelink connection comprises: receiving a CLI measurement signal from the second UE on one or more indicated CLI measurement resources; determining a measurement metric of the received CLI measurement signal; and determining whether to establish the sidelink connection with the second UE based on the determined measurement metric of the received CLI measurement signal relative to a value.

7. The method according to claim 6, wherein the measurement metric includes at least one of a reference signal received power (RSRP), a reference signal received quality (RSRQ), a received signal strength indicator (RSSI), a signal-to-noise ratio (SNR), or a signal-to-interference plus noise ratio (SINR).

8. The method according to claim 6, wherein the CLI measurement configuration further indicates one or more of a periodicity, an offset, a number of resource blocks (RBs), or a number of orthogonal frequency division multiplexing (OFDM) symbols corresponding to the transmission of the CLI measurement signal on one or more indicated CLI measurement resources.

9. The method according to claim 6, wherein the CLI measurement signal is received according to the CLI measurement configuration.

10. The method according to claim 6, wherein the CLI measurement signal includes one of a sounding reference signal (SRS), a demodulation reference signal (DM-RS), or a channel state information CSI reference signal (CSI-RS).

11. The method according to claim 6, wherein the CLI measurement configuration indicates a reference signal received power type measurement CLI procedure, and the CLI measurement signal includes one or more sounding reference signal (SRS) resource sets or demodulation reference signal (DM-RS) resource sets.

12. The method according to claim 11, wherein the CLI measurement configuration identifies the one or more SRS resource sets or DMRS resource sets.

13. The method according to claim 6, wherein the determined measurement metric indicates the proximity of the first UE to the second UE.

14. The method according to claim 6, wherein determining whether to establish the sidelink connection comprises: establishing the sidelink connection with the second UE based on the determined measurement metric of the received CLI measurement signal being greater than a value.

15. The method according to claim 14, further comprises: determining that the second UE is within a distance of the first UE based on the determined measurement metric being greater than the value.

16. The method according to claim 6, wherein determining whether to establish the sidelink connection comprises: avoiding establishing the sidelink connection with the second UE based on the determined measurement metric of the received CLI measurement signal being less than a value.

17. The method according to claim 16, further comprises: determining that the second UE is at a distance greater than a distance from the first UE based on the determined measurement metric being less than the value.

18. The method according to claim 1, wherein selectively establishing the sidelink connection comprises: detecting a CLI on a downlink (DL) channel caused by an uplink (UL) transmission from the second UE; responsive to detecting the CLI on the DL channel, determining one or more dedicated resources associated with the second UE at least in part based on the identifier; and establishing the sidelink connection with the second UE on the one or more dedicated resources.

19. The method according to claim 18, wherein establishing the sidelink connection further comprises: establishing the sidelink connection with the second UE on the one or more dedicated resources based on the measurement metric of the DL channel being less than a value; or avoiding establishing the sidelink connection with the second UE based on the measurement metric of the DL channel being greater than the value.

20. The method according to claim 19, wherein the measurement metric includes at least one of a reference signal received power (RSRP), a reference signal received quality (RSRQ), a received signal strength indicator (RSSI), a signal-to-noise ratio (SNR), or a signal-to-interference plus noise ratio (SINR).

21. The method according to claim 18, wherein establishing the sidelink connection further comprises: establishing the sidelink connection with the second UE on the one or more dedicated resources based on the power consumption associated with sending data to the second UE via the sidelink connection being less than the power consumption associated with sending data to the network entity on the UL channel by at least a value; or Avoid establishing the sidelink connection with the second UE based on the power consumption associated with sending data to the second UE via the sidelink connection being not less than the value by at least the power consumption associated with sending data to the network entity on the UL channel.

22. The method according to claim 18, wherein the identifier is at least partially based on a correlation between the identifier and one or more operating parameters of the dedicated resource or channel.

23. A first user equipment UE, comprising: at least one modem; at least one processor communicatively coupled to the at least one modem; and at least one memory communicatively coupled to the at least one processor and storing instructions which, when executed by the at least one processor in combination with the at least one modem, cause the first UE to perform operations comprising the following: Receive a CLI measurement configuration carrying an identifier uniquely identifying a second UE for cross-link interference CLI measurement; Selectively establish a sidelink connection with the second UE using the identifier carried in the CLI measurement configuration; and After establishing the sidelink connection with the second UE, use the sidelink connection as a relay connection via which the first UE can use the second UE as a relay or proxy device to send data to and / or receive data from a network entity.

24. The first UE according to claim 23, wherein the CLI measurement configuration is received via a radio resource controller RRC configuration.

25. The first UE according to claim 23, wherein the identifier comprises a user equipment identifier UE ID.

26. The first UE according to claim 25, wherein the CLI measurement configuration carries a mapping between the UE ID and at least one of a cell radio network temporary identifier C-RNTI, a temporary mobile station identifier TMSI, an international mobile subscriber identity IMSI, or a media access control MAC address.

27. The first UE according to claim 23, wherein the CLI measurement configuration indicates one or more CLI measurement resources on which to measure the CLI associated with an uplink UL transmission from the second UE.

28. The first UE according to claim 27, wherein the instructions for establishing the sidelink connection cause the first UE to: Receive a CLI measurement signal from the second UE on one or more indicated CLI measurement resources; Determine a measurement metric of the received CLI measurement signal; and Determine whether to establish the sidelink connection with the second UE based on the determined measurement metric of the received CLI measurement signal relative to a value.

29. The first UE according to claim 28, wherein the measurement metric comprises at least one of a reference signal received power RSRP, a reference signal received quality RSRQ, a received signal strength indicator RSSI, a signal-to-noise ratio SNR, or a signal-to-interference plus noise ratio SINR.

30. The first UE according to claim 28, wherein the CLI measurement configuration further indicates one or more of a periodicity, an offset, a number of resource blocks (RBs), or a number of orthogonal frequency division multiplexing (OFDM) symbols corresponding to the transmission of the CLI measurement signal on one or more indicated CLI measurement resources.

31. The first UE according to claim 28, wherein the CLI measurement signal is received according to the CLI measurement configuration.

32. The first UE according to claim 28, wherein the CLI measurement signal includes one of a sounding reference signal (SRS), a demodulation reference signal (DM-RS), or a channel state information (CSI) reference signal (CSI-RS).

33. The first UE according to claim 28, wherein the CLI measurement configuration indicates a reference signal received power (RSRP)-type measurement CLI procedure, and the CLI measurement signal includes one or more SRS resource sets or DM-RS resource sets.

34. The first UE according to claim 33, wherein the CLI measurement configuration identifies the one or more SRS resource sets or DMRS resource sets.

35. The first UE according to claim 28, wherein the determined measurement metric indicates the proximity of the first UE to the second UE.

36. The first UE according to claim 28, wherein executing the instruction for determining whether to establish the sidelink connection causes the first UE to: Establish the sidelink connection with the second UE based on the determined measurement metric of the received CLI measurement signal being greater than a value.

37. The first UE according to claim 36, wherein executing the instruction causes the first UE to perform an operation that further includes the following: Determine that the second UE is within a distance of the first UE based on the determined measurement metric being greater than the value.

38. The first UE according to claim 28, wherein executing the instruction for determining whether to establish the sidelink connection further causes the first UE to: Avoid establishing the sidelink connection with the second UE based on the determined measurement metric of the received CLI measurement signal being less than a value.

39. The first UE according to claim 38, wherein executing the instruction causes the first UE to perform an operation that further includes the following: Determine that the second UE is at a distance greater than a distance from the first UE based on the determined measurement metric being less than the value.

40. The first UE according to claim 23, wherein executing the instruction for selectively establishing the sidelink connection causes the first UE to: Detect a CLI on a downlink (DL) channel caused by an uplink (UL) transmission from the second UE; Determine one or more dedicated resources associated with the second UE at least in part based on the identifier in response to detecting the CLI on the DL channel; and Establish the sidelink connection with the second UE on the one or more dedicated resources.

41. The first UE according to claim 40, wherein executing the instructions for establishing the sidelink connection causes the first UE to: establish the sidelink connection with the second UE on the one or more dedicated resources based on a measurement metric of the DL channel being less than a value; or avoid establishing the sidelink connection with the second UE based on the measurement metric of the DL channel being greater than the value.

42. The first UE according to claim 41, wherein the measurement metric includes at least one of reference signal received power (RSRP), reference signal received quality (RSRQ), received signal strength indicator (RSSI), signal-to-noise ratio (SNR), or signal-to-interference plus noise ratio (SINR).

43. The first UE according to claim 41, wherein executing the instructions for establishing the sidelink connection causes the first UE to: establish the sidelink connection with the second UE on the one or more dedicated resources based on power consumption associated with sending data to the second UE via the sidelink connection being less than power consumption associated with sending data to the network entity on the UL channel by at least a value; or avoid establishing the sidelink connection with the second UE based on power consumption associated with sending data to the second UE via the sidelink connection being not less than power consumption associated with sending data to the network entity on the UL channel by at least the value.

44. The first UE according to claim 41, wherein the identifier is at least partially based on a correlation between the identifier and one or more operating parameters of the dedicated resource or channel.

45. A first user equipment (UE), comprising: means for receiving a CLI measurement configuration carrying an identifier uniquely identifying a second UE for cross-link interference (CLI) measurement; means for selectively establishing a sidelink connection with the second UE using the identifier carried in the CLI measurement configuration; and means for, after establishing the sidelink connection with the second UE, using the sidelink connection as a relay connection via which the first UE can use the second UE as a relay or proxy device to send data to and / or receive data from a network entity.

46. The first UE according to claim 45, wherein the CLI measurement configuration is received via radio resource control (RRC) configuration.

47. The first UE according to claim 45, wherein the identifier includes a user equipment identifier (UE ID).

48. The first UE according to claim 47, wherein the CLI measurement configuration carries a mapping between the UE ID and at least one of a cell radio network temporary identifier (C-RNTI), a temporary mobile station identifier (TMSI), an international mobile subscriber identity (IMSI), or a media access control (MAC) address.

49. The first UE according to claim 45, wherein the CLI measurement configuration indicates one or more CLI measurement resources on which to measure the CLI associated with an uplink (UL) transmission from the second UE.

50. The first UE according to claim 49, wherein the means for selectively establishing the sidelink connection will: receive a CLI measurement signal from the second UE on one or more indicated CLI measurement resources; determine a measurement metric of the received CLI measurement signal; and determine whether to establish the sidelink connection with the second UE based on the determined measurement metric of the received CLI measurement signal relative to a value.

51. The first UE according to claim 50, wherein the measurement metric includes at least one of reference signal received power (RSRP), reference signal received quality (RSRQ), received signal strength indicator (RSSI), signal-to-noise ratio (SNR), or signal-to-interference plus noise ratio (SINR).

52. The first UE according to claim 50, wherein the CLI measurement configuration further indicates one or more of a periodicity, an offset, a number of resource blocks (RBs), or a number of orthogonal frequency division multiplexing (OFDM) symbols corresponding to the transmission of the CLI measurement signal on one or more indicated CLI measurement resources.

53. The first UE according to claim 50, wherein the CLI measurement signal is received according to the CLI measurement configuration.

54. The first UE according to claim 50, wherein the CLI measurement signal includes one of a sounding reference signal (SRS), a demodulation reference signal (DM-RS), or a channel state information CSI reference signal (CSI-RS).

55. The first UE according to claim 50, wherein the CLI measurement configuration indicates a reference signal received power type measurement CLI procedure, and the CLI measurement signal includes one or more sets of sounding reference signal (SRS) resources or sets of demodulation reference signal (DM-RS) resources.

56. The first UE according to claim 55, wherein the CLI measurement configuration identifies the one or more sets of SRS resources or sets of DMRS resources.

57. The first UE according to claim 50, wherein the determined measurement metric indicates the proximity of the first UE to the second UE.

58. The first UE according to claim 50, wherein the means for determining whether to establish the sidelink connection will: establish the sidelink connection with the second UE based on the determined measurement metric of the received CLI measurement signal being greater than a value.

59. The first UE according to claim 58, further comprising: means for determining that the second UE is within a distance of the first UE based on the determined measurement metric being greater than the value.

60. The first UE according to claim 50, wherein the means for determining whether to establish the sidelink connection will: avoid establishing the sidelink connection with the second UE based on the determined measurement metric of the received CLI measurement signal being less than a value.

61. The first UE according to claim 60, further comprising: a component for determining that the second UE is at a distance greater than a distance from the first UE based on the determined measurement metric being less than the value.

62. The first UE according to claim 45, wherein the component for selectively establishing the sidelink connection will: detect a CLI on a downlink DL channel caused by an uplink UL transmission from the second UE; in response to detecting the CLI on the DL channel, determine one or more dedicated resources associated with the second UE at least in part based on the identifier; and establish the sidelink connection with the second UE on the one or more dedicated resources.

63. The first UE according to claim 62, wherein the component for establishing the sidelink connection will: establish the sidelink connection with the second UE on the one or more dedicated resources based on a measurement metric of the DL channel being less than a value; or avoid establishing the sidelink connection with the second UE based on the measurement metric of the DL channel being greater than the value.

64. The first UE according to claim 63, wherein the measurement metric includes at least one of a reference signal received power RSRP, a reference signal received quality RSRQ, a received signal strength indicator RSSI, a signal-to-noise ratio SNR, or a signal-to-interference-plus-noise ratio SINR.

65. The first UE according to claim 62, wherein the component for establishing the sidelink connection will: establish the sidelink connection with the second UE on the one or more dedicated resources based on a power consumption associated with sending data to the second UE via the sidelink connection being less than a value by at least a power consumption associated with sending data to the network entity on the UL channel; or avoid establishing the sidelink connection with the second UE based on the power consumption associated with sending data to the second UE via the sidelink connection being not less than the value by at least the power consumption associated with sending data to the network entity on the UL channel.

66. The first UE according to claim 62, wherein the identifier is at least in part based on a correlation between the identifier and one or more operating parameters of the dedicated resources or channels.

67. A computer-readable medium having instructions stored thereon, which when executed by a processor cause the processor to perform operations, the operations comprising: receiving a CLI measurement configuration carrying an identifier uniquely identifying a second UE for cross-link interference CLI measurement; selectively establishing a sidelink connection with the second UE using the identifier carried in the CLI measurement configuration; and after establishing the sidelink connection with the second UE, using the sidelink connection as a relay connection via which the first UE can use the second UE as a relay or proxy device to send data to and / or receive data from a network entity.

68. A computer program product comprising computer instructions which, when executed by a processor, cause the processor to perform operations, the operations comprising: receiving a CLI measurement configuration carrying an identifier of a second UE that uniquely identifies the second UE for cross-link interference CLI measurement; selectively establishing a sidelink connection with the second UE using the identifier carried in the CLI measurement configuration; and after establishing the sidelink connection with the second UE, using the sidelink connection as a relay connection via which the first UE can use the second UE as a relay or proxy device to send data to and / or receive data from a network entity.

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