Subcarrier spacing for UE-to-UE cross-link interference measurements

Abstract

Methods, systems, and devices for wireless communication are described. A first user equipment (UE) served by a first cell and a second UE served by a second cell may experience cross-link interference (CLI). The UE may have different subcarrier spacing (SCS) configurations. For example, the uplink SCS of the aggressor UE may be different from the downlink SCS of the victim UE. The serving base station may configure the UE with one or more parameters for generating and measuring signals for managing CLI. These parameters may be based on the uplink SCS of the attacker and the downlink SCS of the victim. The attacker UE may apply these parameters to generate the CLI measurement signal, while the victim UE may apply these parameters to measure the CLI measurement signal, so that the signal from the transmitter is adapted to the resource grid of the receiver.

Description

[0001] This application is a divisional application of the invention patent application with application number 202080008020.7 filed on January 10, 2020 and invention name “Subcarrier Spacing for UE-to-UE Cross-Link Interference Measurement”.

[0002] Cross-references

[0003] This patent application claims priority to U.S. Patent Application No. 16738969, filed by XU et al. on January 9, 2020, entitled “SUBCARRIER SPACING FOR UE-TO-UE CROSS LINK INTERFERENCE MEASUREMENT” and Greek Provisional Patent Application No. 20190100018, filed by XU et al. on January 11, 2019, entitled “UBCARRIER SPACING FOR UE-TO-UE CROSS LINK INTERFERENCE MEASUREMENT”, each of which is assigned to the present assignee. Background Art

[0004] The following relates generally to wireless communications, and more particularly to subcarrier spacing for UE-to-UE cross-link interference measurements.

[0005] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcast, etc. These systems may be able to support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth generation (4G) systems, such as long term evolution (LTE) systems, LTE advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems (which may be referred to as new radio (NR) systems). These systems may use techniques such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include multiple base stations or network access nodes, each of which simultaneously supports communication with multiple communication devices, which may be referred to as user equipment (UE).

[0006] Neighboring cells in a time domain duplex (TDD) system may use different configurations for TDD communications. In some cases, different TDD configurations may result in overlapping transmissions in opposite directions. For example, if uplink transmission and downlink reception are scheduled simultaneously, the uplink transmission of the first UE may interfere with the downlink reception at the second UE. Interference between UEs associated with different TDD configurations in a TDD system may be referred to as cross link interference (CLI). Current techniques for managing CLI in a TDD system may result in inefficient use of communication resources. Summary of the invention

[0007] The described technology relates to improved methods, systems, devices and apparatuses for supporting subcarrier spacing (SCS) for user equipment (UE) to UE cross link interference (CLI) measurement. In general, the described technology provides for applying a transmission configuration at a transmitting UE and a reception configuration at a receiving UE so that the transmitting UE can send a signal for CLI management to the receiving UE even if the transmitting UE and the receiving UE have different SCSs. The SCS of a UE in a cell can be configured by a base station providing the cell. The SCS can be configured per cell or per bandwidth part (BWP), wherein the SCS configuration is indicated to the UE via higher layer signaling such as radio resource control (RRC) signaling. The SCS can also be configured for uplink communication and downlink communication, respectively. Based on the independent and separate configuration of the SCS, the uplink SCS of the first UE can be different from the downlink SCS of the second UE. If a first time division duplex (TDD) configuration for the first UE and a second TDD configuration for the second UE are configured to cause CLI, the attacking UE can send a signal (e.g., a reference signal) to be measured by the victim UE. However, if the uplink SCS configuration of the aggressor UE does not match the downlink SCS configuration of the victim UE, the victim UE may not be able to successfully receive the signal and perform measurements.

[0008] In order to enable measurement of CLI for UEs with different SCS configurations, the UE involved in the CLI measurement may apply parameters associated with the transmission or reception of a signal (e.g., a reference signal) used for CLI measurement. These parameters may be provided by a serving base station (e.g., in a configuration), and the UE may adjust its transmission or reception configuration so that the uplink subcarriers of the transmitting UE are aligned with the downlink subcarriers of the receiving UE. Additionally or alternatively, the UE may apply these parameters so that the signal symbols of the UE with a higher SCS are repeated to match the symbol duration of the UE with a lower SCS. These parameters may include indicators for configuration of a receiver frequency domain comb factor, a transmitter frequency domain comb factor, a receiver frequency domain comb offset, a transmitter frequency domain comb offset, the number of measured OFDM symbols, a phase shift amount, or any combination thereof. In some cases, some parameters may be based on the ratio between the uplink SCS of the transmitting UE and the downlink SCS of the receiving UE. If the uplink SCS is greater than the downlink SCS, the ratio can be uplink SCS to downlink SCS; if the downlink SCS is greater than the uplink SCS, the ratio can be downlink SCS to uplink SCS.

[0009] A method of wireless communication is described. The method may include, at a first UE configured to communicate using a first subcarrier spacing, receiving a configuration for performing a CLI measurement on a signal sent from a second UE at a second subcarrier spacing, determining whether the second subcarrier spacing is different from the first subcarrier spacing, and refraining from performing the CLI measurement if the second subcarrier spacing is different from the first subcarrier spacing.

[0010] An apparatus for wireless communication is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the apparatus, at a first UE configured to communicate using a first subcarrier spacing, to receive a configuration for performing a CLI measurement on a signal sent from a second UE with a second subcarrier spacing, determine whether the second subcarrier spacing is different from the first subcarrier spacing, and avoid performing the CLI measurement if the second subcarrier spacing is different from the first subcarrier spacing.

[0011] Another apparatus for wireless communication is described. The apparatus may include components for: at a first UE configured to communicate using a first subcarrier spacing, receiving a configuration for performing a CLI measurement on a signal sent from a second UE at a second subcarrier spacing, determining whether the second subcarrier spacing is different from the first subcarrier spacing, and refraining from performing the CLI measurement if the second subcarrier spacing is different from the first subcarrier spacing.

[0012] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by a processor to, at a first UE configured to communicate using a first subcarrier spacing, receive a configuration for performing a CLI measurement on a signal sent from a second UE at a second subcarrier spacing, determine whether the second subcarrier spacing is different from the first subcarrier spacing, and avoid performing the CLI measurement if the second subcarrier spacing is different from the first subcarrier spacing.

[0013] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for: if the second subcarrier spacing is the same as the first subcarrier spacing, performing CLI measurements on the signal to obtain signal characteristics associated with the signal, and reporting the signal characteristics to a serving base station.

[0014] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a configuration includes a first configuration associated with a signal received power type CLI measurement, and performing the CLI measurement may be avoided based on the signal received power type CLI measurement.

[0015] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for: receiving a second configuration for performing received power type CLI measurements with a second subcarrier spacing, performing received power type CLI measurements with the second subcarrier spacing, and reporting characteristics measured from the received power type CLI measurements to a serving base station.

[0016] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a first UE may be served by a first cell of a first base station and a second UE may be served by a second cell of a second, different base station.

[0017] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first UE and the second UE may be served by the same cell.

[0018] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for: receiving a measurement gap for performing CLI measurement, wherein the measurement gap may be configured based on a type of CLI measurement, a first subcarrier spacing, and a second subcarrier spacing, switching to the second subcarrier spacing for the measurement gap, performing CLI measurement of a signal from a second UE based on the type of CLI measurement to obtain a signal characteristic of the signal, and reporting the signal characteristic to a serving base station.

[0019] A method of wireless communication is described. The method may include identifying, at a first UE associated with a first subcarrier spacing, parameters for receiving a signal from a second UE at a second subcarrier spacing, determining a type of CLI measurement procedure to perform, measuring a signal characteristic of the signal from the second UE based on the parameters and the type of CLI measurement procedure, and reporting the signal characteristic to a serving base station.

[0020] An apparatus for wireless communication is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the apparatus to: identify, at a first UE associated with a first subcarrier spacing, parameters for receiving a signal from a second UE at a second subcarrier spacing, determine a type of CLI measurement procedure to perform, measure a signal characteristic of the signal from the second UE based on the parameters and the type of CLI measurement procedure, and report the signal characteristic to a serving base station.

[0021] Another apparatus for wireless communication is described. The apparatus may include components for: at a first UE associated with a first subcarrier spacing, identifying parameters for receiving a signal from a second UE at a second subcarrier spacing, determining a type of CLI measurement procedure to perform, measuring a signal characteristic of the signal from the second UE based on the parameters and the type of CLI measurement procedure, and reporting the signal characteristic to a serving base station.

[0022] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by a processor to: identify, at a first UE associated with a first subcarrier spacing, parameters for receiving a signal from a second UE at a second subcarrier spacing, determine a type of CLI measurement procedure to perform, measure a signal characteristic of the signal from the second UE based on the parameters and the type of CLI measurement procedure, and report the signal characteristic to a serving base station.

[0023] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a parameter indicates that a first subcarrier spacing may be less than a second subcarrier spacing, and wherein measuring the signal characteristic may include operations, features, components, or instructions for adjusting a frequency domain comb factor of a receiver based on the parameter.

[0024] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a parameter indicates that a first subcarrier spacing may be less than a second subcarrier spacing, and wherein measuring the signal characteristic may include operations, features, components, or instructions for adjusting a frequency domain comb offset of a receiver based on the parameter.

[0025] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a parameter indicates that a first subcarrier spacing may be greater than a second subcarrier spacing, and wherein measuring the signal characteristic may include operations, features, components, or instructions for adjusting a number of measurement symbols used to measure the signal characteristic based on the parameter.

[0026] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, measuring a signal characteristic may include operations, features, components, or instructions for applying a rotation to at least one of the measurement symbols to demodulate the signal.

[0027] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for applying a rotation including a time domain rotation of at least one symbol or a frequency domain phase ramping of at least one symbol.

[0028] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for measuring a signal characteristic, which may be based on phase continuity between measured symbols of the signal.

[0029] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the type of CLI measurement procedure includes a signal received power type CLI measurement procedure.

[0030] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the type of CLI measurement procedure can be based on the first subcarrier spacing being equal to the second subcarrier spacing.

[0031] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the type of CLI measurement procedure may be a total received power type of CLI measurement procedure.

[0032] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the type of CLI measurement procedure can be based at least in part on the first subcarrier spacing being different from the second subcarrier spacing.

[0033] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a first UE may be served by a first cell of a first base station and a second UE may be served by a second cell of a second, different base station.

[0034] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first UE and the second UE may be served by the same cell.

[0035] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, measuring signal characteristics may include operations, features, components, or instructions for receiving a configuration of a dedicated measurement gap for a CLI measurement procedure, wherein the measurement gap may be configured based on a type of the CLI measurement procedure, a first subcarrier spacing, and a second subcarrier spacing, and switching to a second subcarrier spacing for the measurement gap.

[0036] A method of wireless communication is described. The method may include identifying, at a first UE, a parameter for sending a signal to a second UE, wherein the first UE is configured to communicate using a first subcarrier spacing and the second UE is configured to communicate using a second subcarrier spacing, generating a signal based on the parameter, and sending the signal to the second UE.

[0037] An apparatus for wireless communication is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the apparatus to identify, at a first UE, parameters for sending a signal to a second UE, wherein the first UE is configured to communicate using a first subcarrier spacing and the second UE is configured to communicate using a second subcarrier spacing, generate a signal based on the parameter, and send the signal to the second UE.

[0038] Another apparatus for wireless communication is described. The apparatus may include means for identifying, at a first UE, parameters for sending a signal to a second UE, wherein the first UE is configured to communicate using a first subcarrier spacing and the second UE is configured to communicate using a second subcarrier spacing, generating a signal based on the parameters, and sending the signal to the second UE.

[0039] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by a processor to identify, at a first UE, parameters for sending a signal to a second UE, wherein the first UE is configured to communicate using a first subcarrier spacing and the second UE is configured to communicate using a second subcarrier spacing, generate a signal based on the parameter, and send the signal to the second UE.

[0040] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a parameter indicates that a first subcarrier spacing may be smaller than a second subcarrier spacing, and wherein generating a signal may include operations, features, components, or instructions for adjusting a frequency domain comb factor used to generate the signal based on the parameter.

[0041] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a parameter indicates that a first subcarrier spacing may be less than a second subcarrier spacing, and wherein generating a signal may include operations, features, components, or instructions for adjusting a frequency domain comb offset used to generate the signal based on the parameter.

[0042] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a parameter indicates that a first subcarrier spacing may be greater than a second subcarrier spacing, and wherein generating a signal may include operations, features, components, or instructions for adjusting a number of transmitted symbols for the signal based on the parameter.

[0043] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, generating a signal may include operations, features, components, or instructions for applying a rotation to at least one of the transmitted symbols to maintain phase continuity of the transmitted symbols.

[0044] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for applying a rotation including a time domain rotation of at least one symbol or a frequency domain phase ramp of at least one symbol.

[0045] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a first UE may be served by a first cell of a first base station and a second UE may be served by a second cell of a second, different base station.

[0046] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first UE and the second UE may be served by the same cell.

[0047] A method of wireless communication is described. The method may include identifying, at a base station serving a first UE, an overlap between a downlink symbol or a flexible symbol for the first UE and an uplink symbol for a second UE, wherein the first UE is configured to communicate using a first subcarrier spacing and the second UE is configured to communicate using a second subcarrier spacing, determining a type of CLI measurement to be performed by the first UE, sending to the first UE a configuration for receiving a signal transmitted from the second UE with the second subcarrier spacing for the CLI measurement, and receiving a signal characteristic measured by the first UE for the CLI measurement.

[0048] An apparatus for wireless communication is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the apparatus to: identify, at a base station serving a first UE, an overlap between a downlink symbol or a flexible symbol for the first UE and an uplink symbol for a second UE, wherein the first UE is configured to communicate using a first subcarrier spacing and the second UE is configured to communicate using a second subcarrier spacing, determine a type of CLI measurement to be performed by the first UE, send to the first UE a configuration for receiving a signal sent from the second UE with the second subcarrier spacing for CLI measurement, and receive a signal characteristic measured by the first UE for CLI measurement.

[0049] Another apparatus for wireless communication is described. The apparatus may include components for: identifying, at a base station serving a first UE, an overlap between a downlink symbol or a flexible symbol for the first UE and an uplink symbol for a second UE, wherein the first UE is configured to communicate using a first subcarrier spacing and the second UE is configured to communicate using a second subcarrier spacing, determining a type of CLI measurement to be performed by the first UE, sending to the first UE a configuration for receiving a signal sent from the second UE with the second subcarrier spacing for the CLI measurement, and receiving a signal characteristic measured by the first UE for the CLI measurement.

[0050] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by a processor to: identify, at a base station serving a first UE, an overlap between a downlink symbol or a flexible symbol for the first UE and an uplink symbol for a second UE, wherein the first UE is configured to communicate using a first subcarrier spacing and the second UE is configured to communicate using a second subcarrier spacing, determine a type of CLI measurement to be performed by the first UE, send to the first UE a configuration for receiving a signal sent from the second UE with the second subcarrier spacing for CLI measurement, and receive a signal characteristic measured by the first UE for CLI measurement.

[0051] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the type of CLI measurement may be a signal received power type CLI measurement, and the configuration includes a ratio of the second subcarrier spacing to the first subcarrier spacing.

[0052] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for determining that the type of CLI measurement is a signal received power type CLI measurement based on the first subcarrier spacing being equal to the second subcarrier spacing.

[0053] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for determining that the type of CLI measurement is a total received power type CLI measurement based on the first subcarrier spacing being different from the second subcarrier spacing.

[0054] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a base station serves a first UE via a first cell, and a second UE may be served by a second cell of a second, different base station.

[0055] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a base station serves a first UE and a second UE via a same cell.

[0056] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, measuring signal characteristics may include operations, features, components, or instructions for configuring a dedicated measurement gap for performing CLI measurements based on a type of CLI measurement, a first subcarrier spacing, and a second subcarrier spacing and sending an indicator of the dedicated measurement gap to the first UE.

[0057] A method of wireless communication is described. The method may include identifying, at a base station serving a first UE, an overlap between uplink symbols for the first UE and downlink or flexible symbols for a second UE, wherein the first UE is configured to communicate using a first subcarrier spacing and the second UE is configured to communicate using a second subcarrier spacing, determining a type of CLI measurement to be performed by the second UE, and sending a configuration to the first UE to send a signal to the second UE with the first subcarrier spacing to perform the CLI measurement.

[0058] An apparatus for wireless communication is described. The apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the apparatus to: identify, at a base station serving a first UE, an overlap between uplink symbols for the first UE and downlink or flexible symbols for a second UE, wherein the first UE is configured to communicate using a first subcarrier spacing and the second UE is configured to communicate using a second subcarrier spacing, determine a type of CLI measurement to be performed by the second UE, and send a configuration to the first UE for sending a signal to the second UE with the first subcarrier spacing to perform the CLI measurement.

[0059] Another apparatus for wireless communication is described. The apparatus may include components for: identifying, at a base station serving a first UE, an overlap between uplink symbols for the first UE and downlink or flexible symbols for a second UE, wherein the first UE is configured to communicate using a first subcarrier spacing and the second UE is configured to communicate using a second subcarrier spacing, determining a type of CLI measurement to be performed by the second UE, and sending a configuration to the first UE for sending a signal to the second UE with the first subcarrier spacing to perform the CLI measurement.

[0060] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by a processor to, at a base station serving a first UE, identify an overlap between uplink symbols for the first UE and downlink or flexible symbols for a second UE, wherein the first UE is configured to communicate using a first subcarrier spacing and the second UE is configured to communicate using a second subcarrier spacing, determine a type of CLI measurement to be performed by the second UE, and send a configuration to the first UE to send a signal to the second UE with the first subcarrier spacing to perform the CLI measurement.

[0061] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the type of CLI measurement procedure may be an RSRP type CLI measurement, and the configuration includes a ratio of the second subcarrier spacing to the first subcarrier spacing.

[0062] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for determining that the type of CLI measurement is a signal received power type CLI measurement based on the first subcarrier spacing being equal to the second subcarrier spacing.

[0063] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for determining that the type of CLI measurement is a total received power type CLI measurement based on the first subcarrier spacing being different from the second subcarrier spacing.

[0064] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for adjusting a symbol pattern of the first UE for a time slot including a transmission of a signal based on the first subcarrier spacing being different from the second subcarrier spacing.

[0065] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, adjusting the symbol pattern includes determining each symbol for the first UE that overlaps with a received symbol of a signal for the second UE as an uplink symbol.

[0066] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a base station serves a first UE via a first cell, and a second UE may be served by a second cell of a second, different base station.

[0067] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a base station serves a first UE and a second UE via a same cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Figure 1 An example of a system for wireless communications supporting subcarrier spacing for user equipment (UE)-to-UE cross-link interference measurements according to aspects of the present disclosure is shown.

[0069] Figure 2 An example of a wireless communication system supporting subcarrier spacing for UE-to-UE cross-link interference measurement according to aspects of the present disclosure is shown.

[0070] Figures 3A to 4B Examples of time domain configuration and frequency domain configuration of subcarrier spacing supporting UE-to-UE cross-link interference measurement according to aspects of the present disclosure are shown.

[0071] Figure 5 An example of a process flow to support subcarrier spacing for UE-to-UE cross-link interference measurements according to aspects of the present disclosure is shown.

[0072] Figure 6 and 7 A block diagram of an apparatus supporting subcarrier spacing for UE-to-UE cross-link interference measurement according to aspects of the present disclosure is shown.

[0073] Figure 8 A block diagram of a communications manager supporting subcarrier spacing for UE-to-UE cross-link interference measurements according to aspects of the present disclosure is shown.

[0074] Fig. 9

[0013] A diagram of a system including a device supporting subcarrier spacing for UE-to-UE cross-link interference measurement according to aspects of the present disclosure is shown.

[0075] Fig.10 and 11 A block diagram of an apparatus supporting subcarrier spacing for UE-to-UE cross-link interference measurement according to aspects of the present disclosure is shown.

[0076] Fig.12 A block diagram of a communications manager supporting subcarrier spacing for UE-to-UE cross-link interference measurements according to aspects of the present disclosure is shown.

[0077] Fig.13

[0013] A diagram of a system including a device supporting subcarrier spacing for UE-to-UE cross-link interference measurement according to aspects of the present disclosure is shown.

[0078] Figures 14 to 19 A flow chart illustrating a method of supporting subcarrier spacing for UE-to-UE cross-link interference measurements according to aspects of the present disclosure is shown. DETAILED DESCRIPTION

[0079] Wireless communication systems may use time division duplex (TDD) communications, where a radio channel or carrier is used for uplink transmission and downlink transmission. In some cases, a cell may modify the time slot format for a UE or UE group to follow changes in traffic volume. For example, if the traffic in the cell moves in a direction that is heavier for the uplink, the cell may change the time slot format of the TDD configuration of one or more UEs to a time slot that uses more uplink symbol periods. The base station may indicate a dynamic TDD configuration to the UE in the cell, and the UE may communicate using the new TDD configuration. In some cases, different UEs in adjacent cells or cells may use different TDD configurations, which may result in conflicting symbol periods. For example, a symbol period may be configured for the downlink of a first UE, where the same symbol period is configured for the uplink of a second UE. In some cases, the uplink transmission of a first UE may interfere with the downlink reception at a second UE. This type of interference may be referred to as cross link interference (CLI).

[0080] To manage CLI, the attacker UE may send a signal, such as a reference signal, which is received and measured by the victim UE. The victim UE may measure the signal to estimate the CLI strength. In some cases, the measurement may include determining the reference signal received power (RSRP), reference signal received quality (RSRQ), or received signal strength indicator (RSSI) of the transmitted signal. Each cell may also independently configure a subcarrier spacing (SCS) for uplink and downlink communications for each UE. Based on the independent and separate configuration of the SCS, the uplink SCS of the attacker UE may be different from the downlink SCS of the victim UE. For example, the first base station serving the attacker UE may configure the attacker UE with an uplink SCS value of 15kHz, and the second base station serving the victim UE may configure the victim UE with a downlink SCS value of 30kHz. If the uplink SCS configuration of the attacker UE does not match the downlink SCS configuration of the victim UE, the victim UE may not be able to successfully receive the signal and perform the measurement. In this case, the current technology may not be able to detect or accurately measure the reference signal.

[0081] To account for the difference in SCS at the victim and attacker UEs, the base station serving the UE may configure the UE with parameters associated with sending (e.g., for the attacker UE) or receiving (e.g., for the victim UE) a CLI measurement signal. The attacker UE may apply the transmit parameters when generating the CLI measurement signal, and the victim UE may apply the receive parameters when receiving or measuring the CLI measurement signal. The transmit configuration of the attacker UE may then be compatible with the receive configuration at the victim UE. Typically, the UE may be configured to use a technique that causes the subcarriers of the uplink used by the attacker UE to transmit signals to correspond to the subcarriers of the downlink of the receiver. In addition, signal symbols may be repeated for higher SCS UEs to match the symbol duration of lower SCS UEs. Signals from the attacker UE may fit into the frequency domain and time domain resource grids of the victim UE as if the signals were associated with the same SCS.

[0082] Which parameters to adjust and at which UE (e.g., attacker UE or victim UE) can be based on whether the uplink SCS of the attacker UE is greater than or less than the downlink SCS of the victim UE. For example, if the uplink SCS is greater than the downlink SCS, the victim UE can apply a receiver frequency domain comb factor and a receiver frequency domain comb offset based on the ratio of the uplink SCS to the downlink SCS (e.g., proportionally). Additionally or alternatively, the attacker UE can adjust the number of symbols in the CLI measurement signal based on the ratio of the uplink SCS to the downlink SCS (e.g., proportionally) and perform a linear phase shift on the waveform of the signal. If the downlink SCS is greater than the uplink SCS, the attacker UE can apply a transmitter frequency domain comb factor and a transmitter frequency domain comb offset in proportion to the ratio of the downlink SCS to the uplink SCS. Additionally or alternatively, the victim UE may adjust the number of symbols used for reception and perform a linear phase shift on the received signal, where the number of measured symbols and the amount of phase shift may be proportional to the ratio of the downlink SCS to the uplink SCS.

[0083] In some cases, transmit and receive parameters (e.g., receiver comb factor, receiver comb offset, transmitter comb factor, transmitter comb offset, number of measurement symbols, phase shift amount, or any combination thereof) may be applied to cases where the CLI measurement is based on RSRP or another signal received power type CLI measurement process. In some other examples, if the uplink SCS of the attacker UE is different from the downlink SCS of the victim UE, RSRP-based CLI measurement may not be used. For example, RSRP-based CLI measurement can only be supported when the uplink SCS of the transmitter is the same as the downlink SCS of the receiver. In some cases, if the uplink SCS is different from the downlink SCS, the attacker and victim UEs and their corresponding base stations may use RSSI-based CLI measurement (e.g., without using RSRP or RSRQ-based CLI measurement). In some cases, if the cell is using RSSI-based CLI measurement (e.g., or some other type of total received power type CLI measurement procedure), and the victim UE has a downlink SCS that is less than the uplink SCS of the aggressor UE, then the corresponding symbol in the timeslot at the transmitter may be configured as an uplink symbol. In some cases, if the uplink SCS of the aggressor UE and the downlink SCS of the victim UE are different, CLI measurement may not be supported.

[0084] Aspects of the present disclosure are initially described in the context of wireless communication systems. Aspects of the present disclosure are further illustrated and described by reference to apparatus diagrams, system diagrams, and flow charts related to subcarrier spacing for UE-to-UE cross-link interference measurements.

[0085] Figure 1 An example of a wireless communication system 100 supporting subcarrier spacing for UE-to-UE cross-link interference measurement according to aspects of the present disclosure is shown. The wireless communication system 100 includes a base station 105, a UE 115, and a core network 130. In some examples, the wireless communication system 100 may be a long term evolution (LTE) network, an LTE advanced (LTE-A) network, an LTE-A Pro network, or a new radio (NR) network. In some cases, the wireless communication system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission-critical) communications, low-latency communications, or communications with low-cost and low-complexity devices.

[0086] The base station 105 may communicate wirelessly with the UE 115 via one or more base station antennas. The base station 105 described herein may include or may be referred to by those skilled in the art as a base transceiver, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB), a next generation NodeB or a giga-NodeB (any of which may be referred to as a gNB), a home NodeB, a home eNodeB, or some other suitable terminology. The wireless communication system 100 may include different types of base stations 105 (e.g., macro or small cell base stations). The UE 115 described herein may be able to communicate with various types of base stations 105 and network devices including macro eNBs, small cell eNBs, gNBs, relay base stations, etc.

[0087] Each base station 105 may be associated with a particular geographic coverage area 110 in which communications with various UEs 115 are supported. Each base station 105 may provide communications coverage for the respective geographic coverage area 110 via a communications link 125, and the communications link 125 between the base station 105 and the UE 115 may utilize one or more carriers. The communications link 125 shown in the wireless communication system 100 may include an uplink transmission from the UE 115 to the base station 105, or a downlink transmission from the base station 105 to the UE 115. Downlink transmissions may also be referred to as forward link transmissions, and uplink transmissions may also be referred to as reverse link transmissions.

[0088] The geographic coverage area 110 of the base station 105 can be divided into sectors that constitute a portion of the geographic coverage area 110, and each sector can be associated with a cell. For example, each base station 105 can provide communication coverage for a macro cell, a small cell, a hotspot, or other types of cells, or various combinations thereof. In some examples, the base station 105 can be mobile, thereby providing communication coverage for a mobile geographic coverage area 110. In some examples, different geographic coverage areas 110 associated with different technologies can overlap, and overlapping geographic coverage areas 110 associated with different technologies can be supported by the same base station 105 or different base stations 105. The wireless communication system 100 may include, for example, a heterogeneous LTE / LTE-A / LTE-A Pro or NR network, in which different types of base stations 105 provide coverage for various geographic coverage areas 110.

[0089] The term "cell" refers to a logical communication entity for communicating with a base station 105 (e.g., via a carrier), and may be associated with an identifier (e.g., a physical cell identifier (PCID), a virtual cell identifier (VCID)) for distinguishing adjacent cells operating via the same or different carriers. In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types that may provide access to different types of devices (e.g., machine type communication (MTC), narrowband Internet of Things (NB-IoT), enhanced mobile broadband (eMBB), or other). In some cases, the term "cell" may refer to a portion of a geographic coverage area 110 (e.g., a sector) on which the logical entity operates.

[0090] UE 115 can be dispersed throughout the wireless communication system 100, and each UE 115 can be stationary or mobile. UE 115 can also be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where "device" can also be referred to as a unit, a station, a terminal, or a client. UE 115 can also be a personal electronic device, such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, UE 115 can also refer to a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or an MTC device, etc., which can be implemented in various items such as household appliances, vehicles, meters, etc.

[0091] Some UEs 115, such as MTC or IoT devices, may be low-cost or low-complexity devices and may provide automatic communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC may refer to data communication technology that allows devices to communicate with each other or with a base station 105 without human intervention. In some examples, M2M communication or MTC may include communications from devices that integrate sensors or meters to measure or capture information and relay that information to a central server or application that may utilize or present the information to a person interacting with the program or application. Some UEs 115 may be designed to collect information or implement automated behavior of machines. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based business charging.

[0092] Some UEs 115 may be configured to employ operating modes that reduce power consumption, such as half-duplex communication (e.g., a mode that supports one-way communication via transmission or reception, but not simultaneous transmission and reception). In some examples, half-duplex communication may be performed at a reduced peak rate. Other power saving techniques for UE 115 include entering a power saving "deep sleep" mode when not engaged in active communications, or operating over limited bandwidth (e.g., in accordance with narrowband communications). In some cases, UE 115 may be designed to support critical functions (e.g., mission critical functions), and the wireless communication system 100 may be configured to provide ultra-reliable communications for these functions.

[0093] In some cases, the UE 115 may also communicate directly with other UEs 115 (e.g., using a peer-to-peer (P2P) or device-to-device (D2D) protocol). One or more of the group of UEs 115 utilizing D2D communication may be within the geographic coverage area 110 of the base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of the base station 105, or may not be able to receive transmissions from the base station 105 for other reasons. In some cases, the group of UEs 115 communicating via D2D communication may utilize a one-to-many (1:M) system in which each UE 115 transmits to each other UE 115 in the group. In some cases, the base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between UEs 115 without involving the base station 105.

[0094] The base stations 105 may communicate with the core network 130 and with each other. For example, the base stations 105 may interface with the core network 130 via a backhaul link 132 (e.g., via an S1, N2, N3, or other interface). The base stations 105 may communicate with each other directly (e.g., directly between the base stations 105) or indirectly (e.g., via the core network 130) via a backhaul link 134 (e.g., via an X2, Xn, or other interface).

[0095] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connections, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC), which may include at least one mobile management entity (MME), at least one serving gateway (S-GW), and at least one packet data network (PDN) gateway (P-GW). The MME may manage non-access stratum (e.g., control plane) functions of the UE 115 served by the base station 105 associated with the EPC, such as mobility, authentication, and bearer management. User IP packets may be transmitted through the S-GW, which itself may be connected to the P-GW. The P-GW may provide IP address allocation and other functions. The P-GW may be connected to network operator IP services. Operator IP services may include access to the Internet, (multiple) intranets, IP multimedia subsystems (IMS), or packet switched (PS) streaming services.

[0096] At least some network devices, such as base stations 105, may include subcomponents such as access network entities, which may be examples of access node controllers (ANCs). Each access network entity may communicate with UE 115 through several other access network transmission entities, which may be referred to as radio heads, smart radio heads, or transmit / receive points (TRPs). In some configurations, the various functions of each access network entity or base station 105 may be distributed across various network devices (e.g., radio heads and access network controllers) or integrated into a single network device (e.g., base station 105).

[0097] The wireless communication system 100 can operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Typically, the region of 300 MHz to 3 GHz is referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelength range is approximately 1 decimeter to 1 meter long. UHF waves may be blocked or redirected by buildings and environmental features. However, these waves can penetrate structures enough to allow macro cells to serve UEs 115 indoors. Transmissions using UHF waves can be associated with smaller antennas and shorter ranges (e.g., less than 100 km) than transmissions using smaller frequencies and longer waves in the high frequency (HF) or very high frequency (VHF) portions of the spectrum with frequencies less than 300 MHz.

[0098] The wireless communication system 100 may also operate in the Super High Frequency (SHF) region using frequency bands from 3 GHz to 30 GHz (also known as the centimeter wave bands). The SHF region includes frequency bands such as the 5 GHz Industrial, Scientific, and Medical (ISM) band, which may be used by devices that can tolerate interference from other users.

[0099] The wireless communication system 100 can also operate in the extremely high frequency (EHF) region (e.g., from 30 GHz to 300 GHz), also known as the millimeter wave band. In some examples, the wireless communication system 100 can support millimeter wave (mmW) communications between the UE 115 and the base station 105, and the extremely high frequency antennas of each device can be smaller and closer than the ultra-high frequency antennas. In some cases, this can facilitate the use of antenna arrays within the UE 115. However, the propagation of EHF transmissions may be subject to greater atmospheric attenuation and shorter range than SHF or UHF transmissions. The techniques disclosed herein can be employed across transmissions using one or more different frequency regions, and the designated use of frequency bands across these frequency regions may vary by country or regulatory agency.

[0100] In some cases, the wireless communication system 100 can utilize licensed and unlicensed radio spectrum bands. For example, the wireless communication system 100 can adopt license assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band such as the 5GHz ISM band. When operating in an unlicensed radio spectrum band, wireless devices such as base stations 105 and UE 115 can use a listen-before-talk (LBT) process to ensure that the channel is clear before sending data. In some cases, operations in unlicensed bands can be based on carrier aggregation configurations and component carriers operating in licensed bands (e.g., LAA). Operations in unlicensed spectrum can include downlink transmissions, uplink transmissions, peer-to-peer transmissions, or a combination of these. Duplexing in unlicensed spectrum can be based on frequency division duplexing (FDD), time division duplexing (TDD), or a combination of both.

[0101] In some examples, the base station 105 or the UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. For example, the wireless communication system 100 may use a transmission scheme between a transmitting device (e.g., a base station 105) and a receiving device (e.g., a UE 115), wherein the transmitting device is equipped with multiple antennas and the receiving device is equipped with one or more antennas. MIMO communication may employ multipath signal propagation to improve spectral efficiency by transmitting or receiving multiple signals via different spatial layers, which may be referred to as spatial multiplexing. For example, multiple signals may be transmitted by a transmitting device via different antennas or different combinations of antennas. Similarly, multiple signals may be received by a receiving device via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams. Different spatial layers may be associated with different antenna ports for channel measurement and reporting. MIMO technology includes single-user MIMO (SU-MIMO), in which multiple spatial layers are sent to the same receiving device, and multi-user MIMO (MU-MIMO), in which multiple spatial layers are sent to multiple devices.

[0102] Beamforming, which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station 105 or a UE 115) to shape or direct an antenna beam (e.g., a transmit beam or a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining signals transmitted via antenna elements of an antenna array so that signals propagating in a particular direction relative to the antenna array experience constructive interference while other signals experience destructive interference. Adjustments to signals transmitted via antenna elements may include the transmitting device or the receiving device applying certain amplitude and phase offsets to signals transmitted via each antenna element associated with the device. Adjustments associated with each antenna element may be defined by a set of beamforming weights associated with a particular direction (e.g., relative to the antenna array of the transmitting device or the receiving device, or relative to some other direction).

[0103] In one example, the base station 105 may use multiple antennas or antenna arrays to perform beamforming operations for directional communication with the UE 115. For example, the base station 105 may transmit some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) multiple times in different directions, which may include signals transmitted according to different beamforming weight sets associated with different transmission directions. The transmission of different beam directions can be used to identify (e.g., by the base station 105 or a receiving device, such as the UE 115) a beam direction for subsequent transmission and / or reception by the base station 105.

[0104] Some signals, such as data signals associated with a particular receiving device, may be transmitted by base station 105 in a single beam direction (e.g., a direction associated with a receiving device such as UE 115). In some examples, a beam direction associated with transmitting along a single beam direction may be determined based at least in part on signals transmitted in different beam directions. For example, UE 115 may receive one or more of the signals transmitted by base station 105 in different directions, and UE 115 may report to base station 105 an indication of the signal it received with the highest signal quality or other acceptable signal quality. Although these techniques are described with reference to signals transmitted by base station 105 in one or more directions, UE 115 may employ similar techniques for transmitting signals multiple times in different directions (e.g., for identifying a beam direction for subsequent transmission or reception by UE 115), or for transmitting signals in a single direction (e.g., for transmitting data to a receiving device).

[0105] A receiving device (e.g., UE 115, which may be an example of a millimeter wave receiving device) may try multiple receive beams when receiving various signals from base station 105 (e.g., synchronization signals, reference signals, beam selection signals, or other control signals). For example, the receiving device may try multiple receive directions by receiving via different antenna subarrays, by processing received signals according to different antenna subarrays, by receiving according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, or by processing received signals according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, any of which may be referred to as "listening" according to different receive beams or receive directions. In some examples, the receiving device may receive along a single beam direction using a single receive beam (e.g., when receiving a data signal). The single receive beam may be aligned in a beam direction determined at least in part based on listening according to different receive beam directions (e.g., a beam direction with the highest signal strength, the highest signal-to-noise ratio, or otherwise acceptable signal quality determined at least in part based on listening according to multiple beam directions).

[0106] In some cases, the antennas of a base station 105 or a UE 115 may be located within one or more antenna arrays that may support MIMO operations, or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located on an antenna assembly (e.g., an antenna tower). In some cases, the antennas or antenna arrays associated with a base station 105 may be located in different geographic locations. A base station 105 may have an antenna array with several rows and columns of antenna ports that the base station 105 may use to support beamforming for communications with a UE 115. Similarly, a UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations.

[0107] In some cases, the wireless communication system 100 can be a packet-based network operating according to a layered protocol stack. In the user plane, the communication at the bearer or packet data aggregation protocol (PDCP) layer can be IP-based. The radio link control (RLC) layer can perform packet segmentation and reorganization to communicate on a logical channel. The medium access control (MAC) layer can perform priority processing and multiplex logical channels into transport channels. The MAC layer can also use hybrid automatic repeat request (HARQ) to provide retransmission at the MAC layer to improve link efficiency. In the control plane, the radio resource control (RRC) protocol layer can provide the establishment, configuration and maintenance of the RRC connection between the base station 105 or the core network 130 that supports the radio bearer for user plane data. At the physical layer, the transport channel can be mapped to the physical channel.

[0108] In some cases, UE 115 and base station 105 may support retransmission of data to increase the possibility of successfully receiving data. HARQ feedback is a technique to increase the possibility of correctly receiving data through communication link 125. HARQ may include a combination of error detection (e.g., using cyclic redundancy check (CRC)), forward error correction (FEC) and retransmission (e.g., automatic repeat request (ARQ)). HARQ can improve the throughput of the MAC layer under poor radio conditions (e.g., signal-to-noise ratio conditions). In some cases, a wireless device may support same-slot HARQ feedback, where the device may provide HARQ feedback in a specific time slot for data received in a previous symbol in the time slot. In other cases, the device may provide HARQ feedback in a subsequent time slot or according to some other time interval.

[0109] The time interval in LTE or NR can be expressed as a multiple of the basic time unit. For example, the basic time unit can refer to T s=1 / 30720000 second sampling period. The time interval of the communication resources can be organized according to each radio frame having a duration of 10 milliseconds (ms), where the frame period can be represented as T f =307200T s . A radio frame may be identified by a system frame number (SFN) ranging from 0 to 1023. Each frame may include 10 subframes numbered 0 to 9, and each subframe may have a duration of 1 ms. A subframe may be further divided into 2 slots, each slot having a duration of 0.5 ms, and each slot may contain 6 or 7 modulation symbol periods (e.g., depending on the length of the cyclic prefix preceding each symbol period). In addition to the cyclic prefix, each symbol period may contain 2048 sampling periods. In some cases, a subframe may be the minimum scheduling unit of the wireless communication system 100 and may be referred to as a transmission time interval (TTI). In other cases, the minimum scheduling unit of the wireless communication system 100 may be shorter than a subframe, or may be dynamically selected (e.g., in a burst of a shortened TTI (sTTI), or in a component carrier selected using an sTTI).

[0110] In some wireless communication systems, a time slot may be further divided into multiple mini-slots containing one or more symbols. In some cases, a symbol of a mini-slot or a mini-slot may be the minimum unit of scheduling. For example, the duration of each symbol may vary depending on the subcarrier spacing or the operating frequency band. In addition, some wireless communication systems may implement time slot aggregation, where multiple time slots or mini-slots are aggregated together and used for communication between UE 115 and base station 105.

[0111] The term "carrier" refers to a collection of radio frequency spectrum resources with a defined physical layer structure for supporting communication over the communication link 125. For example, a carrier of the communication link 125 may include a portion of a radio frequency spectrum band that operates according to a physical layer channel for a given radio access technology. Each physical layer channel may carry user data, control information, or other signaling. A carrier may be associated with a predefined frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute Radio Frequency Channel Number (EARFCN)) and may be located according to a channel raster to be discovered by a UE 115. A carrier may be a downlink or uplink (e.g., in FDD mode), or may be configured to carry downlink and uplink communications (e.g., in TDD mode). In some examples, a signal waveform transmitted over a carrier may be composed of multiple subcarriers (e.g., using a multi-carrier modulation (MCM) technique such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)).

[0112] The organization structure of the carrier may be different for different radio access technologies (e.g., LTE, LTE-A, LTE-A Pro, NR). For example, communications on a carrier can be organized based on TTIs or time slots, where each TTI or time slot can include user data and control information or signaling to support decoding of the user data. The carrier may also include dedicated acquisition signaling (e.g., synchronization signals or system information, etc.) and control signaling to coordinate the operation of the carrier. In some examples (e.g., in a carrier aggregation configuration), the carrier may also have acquisition signaling or control signaling to coordinate the operation of other carriers.

[0113] Physical channels can be multiplexed on a carrier according to various techniques. Physical control channels and physical data channels can be multiplexed on a downlink carrier, for example, using time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques. In some examples, the control information sent in the physical control channel can be distributed in a cascaded manner between different control regions (e.g., between a common control region or common search space and one or more UE-specific control regions or UE-specific search spaces).

[0114] A carrier may be associated with a particular bandwidth of the radio frequency spectrum, and in some examples, the carrier bandwidth may be referred to as the "system bandwidth" of the carrier or wireless communication system 100. For example, the carrier bandwidth may be one of several predetermined bandwidths of a carrier for a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz). In some examples, each served UE 115 may be configured to operate on part or all of the carrier bandwidth. In other examples, some UEs 115 may be configured to operate using a narrowband protocol type associated with a predefined portion or range (e.g., a set of subcarriers or RBs) within a carrier (e.g., an "in-band" deployment of a narrowband protocol type).

[0115] In a system using MCM technology, a resource element may include a symbol period (e.g., the duration of a modulation symbol) and a subcarrier, where the symbol period and the subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme). Therefore, the more resource elements received by UE 115 and the higher the order of the modulation scheme, the higher the data rate may be for UE 115. In a MIMO system, wireless communication resources may refer to a combination of radio spectrum resources, time resources, and space resources (e.g., space layers), and the use of multiple space layers may further increase the data rate used to communicate with UE 115.

[0116] A device of the wireless communication system 100 (e.g., a base station 105 or a UE 115) may have a hardware configuration that supports communication on a specific carrier bandwidth, or may be configured to support communication on one of a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 and / or a UE 115 that supports simultaneous communication via carriers associated with more than one different carrier bandwidths.

[0117] The wireless communication system 100 may support communication with the UE 115 on multiple cells or carriers, a feature which may be referred to as carrier aggregation or multi-carrier operation. The UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used with both FDD and TDD component carriers.

[0118] In some cases, the wireless communication system 100 can utilize an enhanced component carrier (eCC). An eCC can have one or more characteristics, including a wider carrier or frequency channel bandwidth, a shorter symbol duration, a shorter TTI duration, or a modified control channel configuration. In some cases, an eCC can be associated with a carrier aggregation configuration or a dual connectivity configuration (e.g., when multiple serving cells have suboptimal or non-ideal backhaul links). An eCC can also be configured for use with unlicensed spectrum or shared spectrum (e.g., allowing multiple operators to use the spectrum). An eCC characterized by a wide carrier bandwidth can include one or more segments that can be used by a UE 115 that is not able to monitor the entire carrier bandwidth or is otherwise configured to use a limited carrier bandwidth (e.g., to save power).

[0119] In some cases, an eCC may use a symbol duration different from that of other component carriers, which may include using a reduced symbol duration compared to the symbol duration of other component carriers. A shorter symbol duration may be associated with an increased spacing between adjacent subcarriers. A device utilizing an eCC, such as a UE 115 or a base station 105, may transmit a wideband signal (e.g., based on a frequency channel or carrier bandwidth of 20, 40, 60, 80 MHz, etc.) at a reduced symbol duration (e.g., 16.67 microseconds). A TTI in an eCC may consist of one or more symbol periods. In some cases, the TTI duration (i.e., the number of symbol periods in a TTI) may be variable.

[0120] The wireless communication system 100 may be an NR system that may utilize any combination of licensed, shared, and unlicensed spectrum bands, etc. The flexibility of eCC symbol duration and subcarrier spacing may allow eCC to be used across multiple spectrums. In some examples, NR shared spectrum may improve spectrum utilization and spectrum efficiency, particularly through dynamic vertical (e.g., across frequency domain) and horizontal (e.g., across time domain) resource sharing.

[0121] To manage CLI, the attacker UE 115 may send a signal, such as a reference signal, which is received and measured by the victim UE 115. The victim UE 115 may measure the signal to estimate the CLI strength. In some cases, the measurement may include determining the RSRP, RSRQ, or RSSI of the transmitted signal. The cell may also independently configure the SCS for uplink and downlink communications for each UE 115. Based on the independent and separate configuration of the SCS, the uplink SCS of the attacker UE 115 may be different from the downlink SCS of the victim UE 115. For example, the first base station 105 serving the attacker UE 115 may configure the attacker UE 115 with an uplink SCS value of 15kHz, and the second base station serving the victim UE 115 may configure the victim UE 115 with a downlink SCS value of 30kHz. If the uplink SCS configuration of the aggressor UE 115 does not match the downlink SCS configuration of the victim UE 115, the victim UE 115 may not be able to successfully receive the signal and perform measurements. In this case, current techniques may not be able to detect the reference signal.

[0122] To account for the difference in SCS at the victim and attacker UEs 115, the base station 105 serving the UE 115 may configure the UE 115 with a configuration including one or more parameters associated with sending (e.g., for the attacker UE 115) or receiving (e.g., for the victim UE 115) a CLI measurement signal. The attacker UE 115 may apply the transmit parameters when generating the CLI measurement signal, and the victim UE 115 may apply the receive parameters when receiving or measuring the CLI measurement signal. The transmit configuration of the attacker UE 115 may then be compatible with the receive configuration at the victim UE 115. In general, the UE 115 may be configured to use a technique that causes the subcarriers of the uplink used by the attacker UE 115 to transmit the signal to correspond to the subcarriers of the downlink of the receiver. In addition, the signal symbols may be repeated for the higher SCS UE 115 to match the symbol duration of the lower SCS UE 115. The signals from the aggressor UE 115 may fit into the frequency and time domain resource grids of the victim UE 115 as if the signals were from the same serving cell and using the same TDD configuration.

[0123] Figure 2 An example of a wireless communication system 200 that supports subcarrier spacing for UE-to-UE cross-link interference measurement according to aspects of the present disclosure is shown. In some examples, the wireless communication system 200 can implement aspects of the wireless communication system 100. In some examples, the wireless communication system 200 can implement aspects of the wireless communication system 100. The wireless communication system 200 can include a UE 115-a and a UE 115-b, each of which can be an example of a UE 115 as described herein. The wireless communication system 200 can include a UE 115-a and a UE 115-b, each of which can be an example of a UE 115 as described herein. The wireless communication system 200 can also include a base station 105-a and a base station 105-b, each of which can be an example of a base station 105 as described herein. The base station 105-a and the base station 105-b can each be an example of a small cell. The base stations 105 can each be associated with a cell that provides wireless communication with the base station 105 within the coverage area 110. For example, base station 105 - a may provide a cell within coverage area 110 - a , and base station 105 - b may provide a cell within coverage area 110 - b .

[0124] The wireless communication system 200 may adopt TDD communication, wherein the wireless communication channel is used for uplink transmission and downlink transmission. Each cell may configure a TDD configuration 205 for the cell. For example, the first cell of the base station 105-a may use the first TDD configuration 205-a, and the second cell of the base station 105-b may use the second TDD configuration 205-b. The UE 115 in these cells may communicate with the base station 105 based on the corresponding TDD configuration 205 of the cell. For example, the time slot of the TDD configuration 205 may include a symbol period for a downlink symbol 210, a flexible symbol 215, or an uplink symbol 220, or any combination thereof. The base station 105 may send a downlink transmission in the downlink symbol 210, and the UE 115 may send an uplink transmission in the uplink symbol 220. In some cases, the flexible symbol 215 may be used as a guard period between the uplink transmission and the downlink transmission. The guard period may prevent inter-symbol interference, or may provide time for the UE 115 to adjust the radio frequency hardware. In some cases, the flexible symbol 215 may be dynamically reconfigured as a downlink symbol 210 or an uplink symbol 220 .

[0125] The base station 105 can dynamically change the TDD configuration 205. In one example, the traffic in the first cell can move in the direction of a heavier uplink, so the first TDD configuration 205-a of the first cell can be changed to use a time slot configuration with more uplink symbol periods. In some cases, the TDD configuration 205 can be dynamically indicated to the UE in the cell by the SFI in the DCI. The DCI that transmits the SFI can be sent in one of the first few downlink symbols 210 of the time slot, and the TDD configuration 205 for one or more additional time slots can be transmitted. That is, for the illustrated time slot, an SFI including the TDD configuration 205 can be received in the time slot or in a previous time slot. Additionally or alternatively, the TDD configuration 250 can be semi-statically configured (e.g., included in the RRC configuration) by higher layer signaling such as RRC signaling.

[0126] In some cases, the different TDD configurations 205 used by adjacent cells may cause the transmission direction conflicts of some symbol periods of the time slot. For example, the 9th and 10th symbol periods of the time slot shown may have conflicting directions for the first TDD configuration 205-a and the second TDD configuration 205-b. When the TDD configuration 205-b has the configured downlink symbol 210, the TDD configuration 205-a may have the configured uplink symbol 220. Therefore, the UE 115-a in the first cell may be configured to send uplink transmission, and the UE 115-b in the second cell is configured to receive downlink transmission. The first cell and the second cell may be adjacent cells, and UE 115-b and UE 115-a may be close to each other at the edge of their respective cells. In some cases, the uplink transmission of UE 115-a may interfere with the reception of the downlink transmission at UE 115-b. This type of interference may be referred to as UE to UE CLI, shown by CLI 225 at the conflict symbol period. Typically, when an uplink symbol of one cell collides with a downlink symbol of another nearby cell, a different TDD configuration 205 may result in a UE-to-UE CLI 225. CLI 225 may occur near or between cell edge UEs of neighboring cells. The UE 115 that transmits the uplink signal (here, for example, UE 115-a) may be referred to as the aggressor UE 115, and the UE 115 that is receiving the affected downlink transmission (here, for example, UE 115-b) may be referred to as the victim UE 115. In some cases, CLI 225 may occur between one or more aggressor UEs 115 and one or more victim UEs 115.

[0127] In order to manage CLI 225 in the wireless communication system 200, the attacking UE 115 may send a signal during one or more symbol periods in which CLI 225 may occur. The victim UE 115 may be configured to receive and measure the CLI measurement signal during these symbol periods. The CLI measurement signal may be a reference signal such as SRS. In some cases, the SRS may be sent across a wide bandwidth (e.g., up to or including the entire cell bandwidth). The SRS may not be associated with an uplink grant. For example, the SRS may be sent in resources different from those granted for uplink shared channel transmissions. In some conventional wireless systems, the SRS may be sent by the UE 115 to the base station 105. The base station 105 in these conventional systems may measure the SRS to determine which parts of the frequency bandwidth provide the strongest channel quality or condition for the UE 115. The base station 105 may use these measurements when configuring resources for the UE 115. In some other examples, the CLI measurement signal may be, for example, a demodulation reference signal (DMRS).

[0128] In this example, UE 115-a may send a CLI measurement signal in the 9th and 10th symbol periods of a time slot (e.g., corresponding to uplink symbol 220), which are scheduled to cause CLI 225. UE 115-b may receive the CLI measurement signal (e.g., in the corresponding downlink symbol 210) and perform a measurement process using the CLI measurement signal. UE 115-b may send a measurement report including a measurement of the CLI measurement signal (e.g., a signal received power type measurement, such as RSRP or RSRQ, a total received power type measurement, such as RSSI) to base station 105-b. Configurations for sending the CLI measurement signal at the attacker UE 115 and receiving and measuring the CLI measurement signal at the victim UE 115 may be determined and configured at respective serving cells for the attacker and victim UEs 115. For example, base station 105-a may send a first configuration to UE 115-a, and UE 115-a may send a CLI measurement signal based on the configuration. The base station 105-b may send a second configuration to the UE 115-b, and the UE 115-b may monitor, receive, and measure the CLI measurement signal based on the second configuration.

[0129] The network may use the measurement reports to determine whether the UE-to-UE CLI 225 causes too much performance degradation at UE 115-b, or whether UE 115-b can handle more interference. In some cases, the network may determine that UE 115-b can handle more interference from CLI 225 and implement a more aggressive TDD configuration 205 for one or both cells. A more aggressive TDD configuration 205 may introduce more overlapping symbols and more CLI 225, but may introduce higher throughput. In some cases, the network may determine that the interference from CLI 225 affects the downlink reception at UE 115-b too much, and the network may implement a less aggressive TDD configuration 205 for one or both cells. A less aggressive TDD configuration 205 may reduce the number of overlapping symbols and reduce UE-to-UE CLI 225, which may improve the channel conditions of the victim UE 115. In some examples, the determination may be based on a threshold or tolerance. For example, if the channel quality, RSRP, RSSI, RSRQ, or another measurement metric at the victim UE 115 is above a threshold, the serving cell of the victim UE 115 may implement a less aggressive TDD configuration 205. In some cases, one or more of the base stations 105 may determine whether to use a more aggressive or less aggressive TDD configuration 205. Additionally or alternatively, a control unit (CU), a gNB, or some other entity may determine one or more TDD configurations 205 based on measurements.

[0130] In some cases, either the victim UE 115 or the attacker UE 115 may measure the CLI strength. For example, the victim UE 115-b may measure the signal sent by the attacker UE 115-a. Additionally or alternatively, the UE 115-a may measure the signal sent by the UE 115-b. Based on the channel reciprocity of the TDD channel, the measurement made by the UE 115-a may also reflect the interference strength of the attacker to the victim.

[0131] As described herein, the CLI measurement may be an RSRP, RSRQ, or RSSI measurement, or a combination of these measurements. RSRP may measure the received reference signal power of a configured reference signal resource. RSSI may indicate the total received power measured in a selected OFDM symbol (e.g., including thermal noise, interference, signal strength, etc.). The measurement may be based on different levels of CLI measurement signals. For example, the measurement may be cell-specific, where all UEs 115 in a cell send the same CLI measurement signal. In some cases, the measurement may be group-specific, where a subset of UEs 115 in a cell sends the same CLI measurement signal. In some examples, the measurement may be UE-specific, where each UE 115 in a cell sends a different CLI measurement signal that is unique to the UE 115. This may provide different levels of granularity for determining CLI strength, tolerance, and impact.

[0132] In some cases, the base station 105 may configure the UE 115 with an SCS. The SCS may be configured on a per-cell or per-BWP basis. If each of the cells and the BWPs of the cell has an SCS configuration, the BWP configuration may override the cell-specific configuration. In some cases, the base station 105 may configure the SCS separately for uplink and downlink transmissions, and these values ​​may be different from each other (e.g., the SCS may be 15 kHz for uplink transmissions and 30 kHz for downlink transmissions). Some examples of SCS values ​​(e.g., for NR SCS) may include 15 kHz, 20 kHz, 30 kHz, 40 kHz, 50 kHz, 60 kHz, 70 kHz, 80 kHz, 90 kHz, 100 kHz, ...80 kHz, 90 kHz, 100 kHz, 30 kHz, 40 kHz, 50 kHz, 80 kHz, 90 kHz, 100 kHz, 30 kHz, 40 kHz, 50 kHz, 80

[0133] 30kHz, 60kHz, 120kHz, or 240kHz, although some other values ​​may also be used. In some cases, the symbol duration, cyclic prefix (CP) length, or both may be inversely proportional to a given SCS. For example, the symbol duration of a UE 115 using an SCS of 15kHz may be twice the symbol duration of a UE 115 using an SCS of 30kHz.

[0134] In the case where the uplink SCS at the aggressor UE 115 is different from the downlink SCS at the victim UE 115, the transmitter and the receiver may adjust their transmission configuration and reception configuration, respectively, for the CLI measurement signaling. Using the described techniques, the transmitting, aggressor UE 115 or the receiving, victim UE 115, or both may adjust the frequency domain configuration so that the subcarriers used for uplink transmission correspond to the subcarriers used for downlink reception. In some cases, the transmitter may use certain uplink subcarriers by applying a transmitter comb factor and a transmitter comb offset. Additionally or alternatively, the receiver may monitor certain downlink subcarriers by applying a receiver comb factor and a receiver comb offset.

[0135] In some cases, the UE 115 with the smaller SCS may modify the comb factor and comb offset (if configured). For example, if the uplink SCS of the aggressor UE 115 is half of the downlink SCS of the victim UE 115, the aggressor UE 115 may apply a transmitter comb factor or a transmitter comb offset or both to transmit every other subcarrier. Figure 3A This example is described in more detail in . In another example, if the uplink SCS of the aggressor UE 115 is twice the downlink SCS of the victim UE 115, the victim UE 115 may use the receiver comb factor and the receiver comb offset (if configured) to adjust the uplink subcarriers so that the victim UE 115 expects to transmit on every other configured subcarrier. Figure 4A This example is described in more detail in .

[0136] In some cases, UE 115 may also adjust the time domain configuration for CLI measurements. For example, reference signal symbols may be repeated at UE 115 with a higher SCS to match the symbol duration of UE 115 with a lower SCS. For example, if the symbol duration of aggressor UE 115 is twice that of victim UE 115, victim UE 115 may be configured to receive and measure two symbols. Victim UE 115 may be indicated that there is phase continuity between two symbols. Figure 3B This example may be described in more detail in . In another example, if the symbol duration of the aggressor UE 115 is half the symbol duration of the victim UE 115, the aggressor UE 115 may then send two reference signals within the span of one victim UE 115 symbol period. This may be done in Figure 4B In some cases, a phase offset may be applied at a UE 115 having a higher SCS to match the phase of the UE 115 to a lower SCS.

[0137] In some cases, the frequency domain and time domain configuration adjustments can be based on the ratio between the larger SCS and the smaller SCS. In some cases, the attacker and victim UE 115 can each receive parameters including the ratio from the serving base station 105. For example, the base station 105-a can provide the parameters to the UE 115-a, and the base station 105-b can provide the parameters to the UE 115-b. For example, if the uplink SCS of the attacker UE 115 is greater than the downlink SCS of the victim UE 115, the serving base stations 105 of the attacker and victim UEs 115 can send indicators of the ratio of the uplink SCS to the downlink SCS to the attacker and victim UEs 115. Alternatively, if the uplink SCS of the attacker UE 115 is less than the downlink SCS of the victim UE 115, the base station can instead send an indicator of the ratio of the downlink SCS to the uplink SCS. In either case, a receiver comb factor, a receiver comb offset, a transmitter comb factor, a transmitter comb factor, an OFDM measurement symbol, a phase offset, or a combination thereof may be determined based on the ratio. In some cases, the ratio may be determined based on the base station 105 exchanging TDD configurations (including SCS information) associated with the UE 115 it serves.

[0138] In one example, if the uplink SCS of the attacker UE 115 is 15kHz and the downlink SCS of the victim UE 115 is 30kHz, the ratio N may be equal to 2. Conversely, if the uplink SCS of the attacker UE 115 is 30kHz and the downlink SCS of the victim UE 115 is 15kHz, the ratio may still be equal to 2. In general, the ratio may be equal to the larger SCS divided by the smaller SCS. In another example, if the uplink SCS of the attacker UE 115 is 30kHz and the downlink SCS of the victim UE 115 is 120kHz, the ratio N may be equal to 4. When the ratio is applied to the frequency domain configuration, the UE 115 with the smaller SCS may use a comb factor and a comb offset (if configured) that is N times the comb factor and comb offset of the UE 115 with the larger SCS. This ratio may also be applied to a time domain configuration, where a UE 115 with a larger SCS may send N CLI measurement signals or monitor a CLI measurement signal spanning N CLI measurement signals.

[0139] In the case where the CLI measurement is based on RSRP, the UE 115 may receive one or more reference signals and may attempt to perform coherent processing on the one or more reference signals. For example, the UE 115 may perform operations for channel estimation and filtering to reduce noise. In the case where the CLI measurement is based on RSSI, the UE 115 may measure the total power of all received signals and thus may perform the measurement even without receiving reference signals or coherently processing the reference signals. Thus, the application of the described transmit and receive parameters may generally be associated with RSRP-based CLI measurements, although RSSI-based CLI measurements may also include the application of these parameters in some cases.

[0140] The measurement type used for CLI management can be based on the relationship between the uplink SCS and the downlink SCS. For example, in some cases, RSRP-based CLI measurements can be used only when the uplink SCS of the transmitter is the same as the downlink SCS of the receiver. In some cases, RSSI-based CLI measurements can be used for any configuration of the uplink SCS and the downlink SCS (for example, if the uplink SCS is smaller, larger, or the same as the downlink SCS, RSSI-based CLI measurements can be used). In some cases of RSSI-based CLI measurements, where the victim UE 115 has a smaller SCS and / or a larger symbol duration, each symbol of the attacking UE 115 corresponding to the downlink symbol for receiving the measurement signal can be configured as an uplink symbol 220, so that the measurement results are unbiased and / or less biased than when some symbols are downlink symbols 210 or flexible symbols 215. In some cases, if the reference subcarrier spacing is larger than the subcarrier spacing of the configured active downlink bandwidth portion, the network may configure the starting position and number of symbols to be a multiple of the reference subcarrier spacing divided by the subcarrier spacing of the active bandwidth portion. In some other examples, if the downlink SCS of the victim UE 115 and the uplink SCS of the aggressor UE 115 are different, the wireless communication system 200 may not support CLI measurements.

[0141] In some cases, a device receiving a CLI SRS may avoid performing CLI measurements on the CLI SRS. In some cases, when the subcarrier spacing of the transmitting UE 115 is different from the subcarrier spacing of the downlink active bandwidth portion, the UE 115 may not be required to measure the SRS. For example, if the uplink subcarrier spacing of the transmitter is the same as the downlink subcarrier spacing of the receiver, RSRP-based CLI measurements may be supported. In some examples, the subcarrier spacing for the CLI measurement resource configuration may be the same or different from the SCS of the active bandwidth portion. In some cases, when the uplink resources of the transmitter and the downlink resources of the receiver have different subcarrier spacings, RSSI-based CLI measurements may be supported. For example, if the uplink SCS is different from the downlink SCS, the base station 105 or UE 115 may avoid performing RSRP-based CLI measurements. In some cases, if the receiving device avoids performing RSRP-based CLI measurements, the receiving device may use another type of CLI measurement (e.g., RSSI). In some examples, if the transmitter and the receiver do not have the same SCS, CLI measurements between UEs may not be performed.

[0142] Configuring the signal from the aggressor UE 115 to match the time domain (e.g., symbol duration) and frequency domain (subcarriers) of the resource grid of the victim UE 115 can provide enhanced signal reception and measurement at the victim UE 115. This can result in efficient CLI management of the wireless communication system 200. In general, the techniques described herein configure the transmission from the aggressor UE 115 for CLI measurement to be suitable for receiving, the resource grid of the victim UE 115, as if the transmitter and the receiver were configured with the same SCS. Therefore, the CLI measurement can be based on the normal SCS configuration of the victim UE 115. Therefore, the UE 115 can perform CLI measurements without having to configure a dedicated measurement gap for only sending or receiving CLI measurement signals. Therefore, the UE 115 can maintain the same SCS configuration without being configured to switch to a different SCS configuration to perform CLI measurements. The UE 115 can quickly switch from control and data signaling with the serving cell to performing CLI measurements without having to wait for the measurement gap to be configured and then wait for the configured measurement gap to start. For example, the receiving UE 115 may receive the CLI measurement signal in symbols adjacent to symbols used for control or data signaling.

[0143] Despite Figure 2105-a and 105-b may actually be performed by a single base station 105 to manage CLI occurring within a cell provided by the single base station 105. This may occur based on the single base station 105 configuring different SCS configurations (e.g., different uplink and downlink SCSs) for UEs 115 within the cell.

[0144] In some cases, the signal used for CLI measurement can be multiplexed with other signals or channels (e.g., control or data signaling). In some examples, the multiplexing can be based on resource element level rate matching of the uplink shared channel and the downlink shared channel around the CLI signal. In some cases, signals from different cells, UE groups, UE 115, or any combination thereof can be multiplexed even if the signals from these different sources have different SCS configurations. This can improve resource usage efficiency. In some examples, UE 115 can instead simply switch to a different SCS and use the configured measurement gap.

[0145] Some techniques described herein may support CLI signal measurements without configuring dedicated measurement gaps at the receiving, victim UE 115. For example, for RSRP-based CLI measurements, if the uplink SCS of the attacker UE 115 and the downlink SCS of the victim UE 115 are different, the attacker UE 115 and the victim UE 115 may apply transmit parameters and receive parameters to adjust their respective time domain or frequency domain configurations, as described herein. In some cases, implementing CLI measurements at the UE 115 with so few restrictions may increase UE complexity. Therefore, in some cases, the CLI measurement configuration may be based on some conditions. For example, in some other examples, RSRP-based CLI measurements may be supported only when the uplink SCS of the attacker UE 115 is the same as the downlink SCS of the victim UE 115. In some cases, these two techniques may be implemented when dedicated measurement gaps for CLI RSRP measurements are not configured at the receiving, victim UE 115.

[0146] In some cases, when no dedicated measurement gap is configured at the receiving end UE 115 and the CLI measurement process is based on RSSI measurement, the corresponding symbols in the time slot of the transmitter can all be configured as uplink symbols so that the measurement results are not biased. For example, for RSSI-based measurements at a receiver UE with a smaller subcarrier spacing and a larger symbol duration, the corresponding symbols in the time slot of the transmitter can all be uplink. In some examples, it is possible to avoid configuring a dedicated measurement gap for CLI RSSI measurement, regardless of whether the uplink SCS of the attacker UE 115 and the downlink SCS of the victim UE 115 are the same or different. In some cases, CLI measurements between UEs 115 can be supported only when the transmitter and receiver use the same SCS (e.g., no dedicated CLI measurement gap is configured at the receiver). In some cases, a dedicated measurement gap can be configured for at least CLI RSRP measurements between UEs 115 with different SCS configurations. In the dedicated measurement gap, the victim UE 115 can switch to a different SCS to perform measurements of the CLI measurement signal. In some cases, dedicated measurement gaps may be configured based on the type of CLI measurement process, the first SCS, and the second SCS.

[0147] Figure 3A An example of a frequency domain configuration 300-a supporting subcarrier spacing for UE-to-UE cross-link interference measurement according to aspects of the present disclosure is shown. In some examples, the frequency domain configuration 300-a can be implemented by aspects of wireless communication systems 100 and 200. The frequency domain configuration 300-a can be implemented by base station 105 and UE 115, as shown in reference Figure 1 and 2 described.

[0148] The frequency domain configuration 300-a may include a transmit frequency range 305-a and a receive frequency range 305-b. The transmit frequency range 305-a may be associated with the attacker UE 115, and the receive frequency range 305-b may be associated with the victim UE 115. Each frequency range 305 may be associated with an SCS 310. For example, the transmit frequency range 305-a may be associated with an uplink SCS 310-a, and the receive frequency range 305-b may be associated with a downlink SCS 310-b. The frequency domain configuration 300-a may correspond to an example in which the uplink SCS 310-a of the attacker UE 115 is smaller than the downlink SCS 310-b of the victim UE 115. In this example, the ratio of the larger SCS to the smaller SCS is equal to 2.

[0149] Each subcarrier of the frequency range 305 can be a reference signal subcarrier 315 or a non-reference signal subcarrier 320 (e.g., a subcarrier carrying a null symbol). Each subcarrier of the receiving frequency range 305-b can be a reference signal subcarrier 315. The determination of which subcarriers of the transmitting frequency range 305-a are reference signal subcarriers 315 and which are non-reference signal subcarriers 320 (e.g., null symbols) can be based on a transmitter comb factor and a transmitter comb offset. The transmitter comb factor P can indicate that a reference signal will be transmitted once for every P subcarriers of the transmitting frequency range 305-a. For example, in this example, a reference signal can be transmitted once for every 2 subcarriers. Therefore, the transmitter comb factor can be 2. The transmitter comb offset can determine the starting subcarrier for reference signal transmission within an RB within a resource block. For example, the transmitter comb offset Q can indicate that the first reference signal will be transmitted in the Qth subcarrier of the RB. In some cases, the transmitter comb factor and the transmitter comb offset may be based on the ratio of the downlink SCS 310-b to the uplink SCS 310-a, the receiver comb factor and the receiver comb offset used by the victim UE 115. For example, if the ratio of the downlink SCS 310-b to the uplink SCS 310-a is N, the transmitter comb factor may be equal to N times the receiver comb factor, and the transmitter comb offset may be equal to N times the receiver comb offset. In this example, the receiver comb factor may be equal to 1, so the configured transmitter comb factor may be 2, where N*1=2.

[0150] Figure 3B An example of a time domain configuration 300-b of subcarrier spacing supporting UE-to-UE cross-link interference measurement according to aspects of the present disclosure is shown. In some examples, the time domain configuration 300-b can be implemented by aspects of wireless communication systems 100 and 200. The time domain configuration 300-b can be implemented by base station 105 and / or UE 115, as shown in reference Figure 1 If the uplink SCS of the attacker UE 115 is greater than the downlink SCS of the victim UE 115, the attacker UE 115, the victim UE 115 and / or their corresponding base stations 105 may implement the time domain configuration 300-b.

[0151] The time domain configuration 300-b may include a transmitter waveform 325-a and a receiver waveform 325-b. The transmitter waveform 325-a may be a waveform transmitted by the aggressor UE 115, and the receiver waveform 325-b may be the same waveform received by the victim UE 115. Although the channel modification is not shown in the time domain configuration 300-b, it should be understood that the receiver waveform 325-b may have one or more channel modifications or other variations without departing from the scope of the present disclosure. It should also be understood that for ease of illustration, the waveforms are shown as linear ramps and do not depict actual OFDM symbol waveforms.

[0152] Each waveform 325 may include one or more CP regions 330 and one or more OFDM symbol regions 335. The aggressor UE 115 may generate a transmitter waveform 325-a having a CP region 330-a and an OFDM symbol region 335-a. The duration of the transmitter waveform 325-a may correspond to time X. The victim UE 115 may receive a receiver waveform 325-b. Although the shapes of the waveforms 325 may be similar, the difference in symbol period duration (e.g., based on the difference in SCS) may affect how the victim UE 115 processes the CP region 330 and the OFDM symbol region 335. For example, the victim UE 115 may identify a CP region 330-b, followed by an OFDM symbol region 335-b, followed by a CP region 330-c, followed by an OFDM symbol region 335-c. The duration of the CP and OFDM symbols in the transmit waveform may span X', where the ratio between X and X' is proportional to the ratio of the larger SCS to the smaller SCS. In this example, X may be twice as long as X'.Both the duration of the symbol without the CP and the CP itself may be twice as long as the corresponding duration at the receiver.

[0153] For each OFDM symbol configured to be transmitted by the aggressor UE 115, N OFDM symbols may be configured to be measured by the receiving, victim UE 115, where N is based on the ratio between the uplink SCS of the aggressor UE 115 and the downlink SCS of the victim UE 115. Here, the high-value SCS corresponding to the downlink SCS 310-b of the victim UE 115 may be twice the low-value SCS corresponding to the uplink SCS 310-a of the aggressor UE 115. Thus, the victim UE 115 may be configured to measure two OFDM symbols. The two OFDM symbols may correspond to the OFDM symbol region 335-b and the OFDM symbol region 335-c.

[0154] The serving base station 105 of the victim UE 115 may indicate to the victim UE 115 that there is phase continuity between adjacent symbols within every N OFDM symbols. The end of the first OFDM symbol at the receiver and the beginning of the second OFDM symbol may be continuous in phase. For example, as long as the first and second OFDM symbols correspond to the same transmission from the attacking UE 115, there may be no jump or change in phase between the first OFDM symbol and the second OFDM symbol. In some cases, the victim UE 115 may coherently combine the two symbols received in the receiver waveform 325-b. The waveforms of the first symbol and the second symbol at the receiver may not be independent. For example, the second symbol may be a periodic extension of the first symbol. For example, if a phase rotation is applied to the OFDM symbol region 335-c, the victim UE 115 may be able to add two OFDM symbols. For example, the victim UE 115 may apply symbol rotation to the symbol region 335-c in the time domain, or compensate the OFDM symbol region 335-c in the frequency domain with a linear phase slope. The victim UE 115 may then perform a coherent combination of the two symbols.

[0155] Figure 4A An example of a frequency domain configuration 400-a supporting subcarrier spacing for UE-to-UE cross-link interference measurement according to aspects of the present disclosure is shown. In some examples, the frequency domain configuration 400-a can implement aspects of wireless communication systems 100 and 200. The frequency domain configuration 400-a can be implemented by the base station 105 and / or the UE 115, as shown in FIG. Figure 1 If the downlink SCS of the victim UE 115 is greater than the uplink SCS of the attacker UE 115, the attacker UE 115, the victim UE 115 and / or its corresponding base station 105 may implement frequency domain configuration 400-a.

[0156] The frequency domain configuration 400-a may include a transmit frequency range 405-a and a receive frequency range 405-b. The transmit frequency range 405-a may be associated with the attacker UE 115, and the receive frequency range 405-b may be associated with the victim UE 115. Each frequency range 405 may be associated with an SCS 410. For example, the transmit frequency range 405-a may be associated with an uplink SCS 410-a, and the receive frequency range 405-b may be associated with a downlink SCS 410-b. The frequency domain configuration 300-a may correspond to an example in which the uplink SCS 310-a of the attacker UE 115 is smaller than the downlink SCS 310-b of the victim UE 115. In this example, the ratio of the larger SCS to the smaller SCS is equal to 2.

[0157] Each subcarrier of the frequency range 405 can be a reference signal subcarrier 415 or a non-reference signal subcarrier 420 (e.g., a subcarrier that does not carry a reference signal). All subcarriers of the transmission frequency range 405-a can be reference signal subcarriers 415. Determining which subcarriers of the receiving frequency range 405-b are reference signal subcarriers 415 and which are non-reference signal subcarriers 420 can depend on a receiver comb factor and / or a receiver comb offset. The receiver comb factor I can indicate that a reference signal will be received once for every I subcarriers of the receiving frequency range 405-b. For example, in this example, a reference signal can be received once for every 2 subcarriers. Therefore, the receiver comb factor can be 2. The receiver comb offset can determine the starting subcarrier for reference signal reception within an RB within a resource block. For example, a receiver comb offset J can indicate that the first reference signal will be received in the Jth subcarrier of the RB. In some cases, the receiver comb factor and / or receiver comb offset may depend on a ratio of uplink SCS 410-a to downlink SCS 410-b and a corresponding transmitter comb factor and / or transmitter comb offset (e.g., of aggressor UE 115). For example, if the ratio of uplink SCS 410-a to downlink SCS 410-b is N, the receiver comb factor may be equal to N times the transmitter comb factor, and the receiver comb offset may be equal to N times the transmitter comb offset.

[0158] Figure 4B An example of a time domain configuration 400-b supporting subcarrier spacing for UE-to-UE cross-link interference measurement according to aspects of the present disclosure is shown. In some examples, the time domain configuration 400-b can implement aspects of wireless communication systems 100 and 200. The time domain configuration 400-b can be implemented by the base station 105 and / or the UE 115, as described in reference to Figure 1 If the uplink SCS of the attacker UE 115 is less than the downlink SCS of the victim UE 115, the attacker UE 115, the victim UE 115 and / or their corresponding base stations 105 may implement the time domain configuration 400-b.

[0159] The time domain configuration 400-b may include a transmit waveform 425-a and a receive waveform 425-b. The transmit waveform 425-a may be a waveform transmitted by the aggressor UE 115, and the receive waveform 425-b may be the same waveform received by the victim UE 115. Although the channel modification is not shown in the time domain configuration 400-b, it should be understood that the receive waveform 425-b may have one or more channel modifications or other variations without departing from the scope of the present disclosure. It should also be understood that for ease of illustration, the waveforms are shown as linear ramps and do not depict actual OFDM symbol waveforms.

[0160] Each waveform 425 may include one or more CP regions 430 and one or more OFDM symbol regions 435. The transmitter waveform 425-a generated by the aggressor UE 115 may include a CP region 430-a, followed by an OFDM symbol region 435-a, followed by a CP region 430-b, followed by an OFDM symbol region 435-b. The receiver waveform 425-b may include a CP region 430-c, followed by an OFDM symbol region 435-c. The single CP region 430 and the single OFDM symbol region 435 of the aggressor UE 115 transmitting the transmitter waveform 425-a may correspond to time Y'. Meanwhile, the single CP region 430 and the single OFDM symbol region 435 of the victim UE 115 receiving the receive waveform 425-b may span time Y. The ratio between Y and Y' may be proportional to the ratio between the larger SCS (e.g., the uplink SCS 410-a) and the smaller SCS (e.g., the downlink SCS 410-b). In this example, Y may be twice as long as Y'.

[0161] A victim UE 115 having a shorter SCS and a longer symbol duration may be configured to measure one OFDM symbol for every N OFDM symbols configured to be sent by the attacker UE 115, where N is the ratio between the larger SCS (e.g., uplink SCS 410-a) and the smaller SCS (e.g., downlink SCS 410-b). In this example, N may be equal to 2, so the victim UE 115 may be configured to measure one OFDM symbol while the attacker UE 115 is configured to send two OFDM symbols. The serving base station 105 of the attacker UE 115 may send an indicator to the attacker UE 115 indicating that the attacker UE 115 will send N CPs and OFDM symbols. The attacker UE 115 may then apply a phase shift to the N CPs and OFDM symbols so that the transmitter waveform 425-a is continuous in phase. For example, the next symbol starting from CP region 430-b has a phase as if it is an extension of OFDM symbol region 435-a. This may correspond to a circular rotation of one or more symbols in the OFDM symbol waveform so that the end of the OFDM symbol is at the beginning of OFDM symbol region 435. The circular rotation may be obtained by a time domain symbol rotation or a linear phase ramp in the frequency domain. In this way, phase continuity may be maintained between adjacent symbols within every N OFDM symbols at the transmitter.

[0162] Figure 5An example of a process flow 500 for supporting subcarrier spacing for UE-to-UE cross-link interference measurement according to aspects of the present disclosure is shown. In some examples, the process flow 500 can be implemented by aspects of the wireless communication system 100. The process flow 500 can include a UE 115-c and a UE 115-d, each of which can be an example of a UE 115 as described herein. The process flow 500 also includes a base station 105-c and a base station 105-d, each of which can be an example of a base station 105 as described herein. In some cases, the base station 105-c and the base station 105-d can each be an example of a small cell. The base stations 105 can each be associated with a cell that provides wireless communications with the base station 105 within a coverage area. The UE 115-c can be served by a first cell associated with the base station 105-c. The UE 115-d can be served by a second cell associated with the base station 105-d. In some other examples, the UE 115-c and the UE 115-d can be served by the same cell. In some cases, base station 105-c and base station 105-d may actually be a single base station 105 serving two UEs. The following alternative examples may be implemented in which some of the steps are performed in a different order than described or not performed at all. In some cases, the steps may include additional features not mentioned below, or further steps may be added.

[0163] At 505, base station 105-c and base station 105-d may exchange TDD configurations. For example, base station 105 may exchange SCS information for its cells, configured BWPs, transmit directions, or a combination thereof. In some cases, base station 105 may also share mobility information of UE 115 served by it. At 510, base station 105-c and base station 105-d may identify overlap between downlink symbols or flexible symbols of UE 115-c and uplink symbols of UE 115-d, where UE 115-c is configured for a first SCS and UE 115-d is configured for a second SCS.

[0164] At 515, base station 105-c may determine the type of CLI measurement or the type of CLI measurement procedure to be performed by UE 115-c. Base station 105-d may determine the type of CLI measurement to be performed by UE 115-d. Both base stations 105 may determine the same type of CLI measurement so that UE 115 performs the same type of measurement. In some cases, the type of measurement may be a signal received power type CLI measurement. For example, the CLI measurement may be an RSRP measurement. In some other examples, the type of measurement may be a total received power type CLI measurement. For example, the CLI measurement may be an RSSI measurement.

[0165] At 520, the base station 105-c may send a configuration including parameters for sending a signal to the UE 115-d for CLI measurement. The base station 105-d may send parameters to the UE 115-d to receive a signal sent from the UE 115-c for CLI measurement. In the case where the type of CLI measurement is a signal received power type CLI measurement, the parameters may include a ratio of the second subcarrier spacing to the first subcarrier spacing. The UE 115-c may identify the parameters for sending a signal to the UE 115-d. The UE 115-d may identify the parameters for receiving a signal from the UE 115-c. At 525, the UE 115-d may determine the type of CLI measurement to be performed.

[0166] UE 115-c may generate a signal based on the configuration and send the signal to UE 115-d at 530. In some cases, the parameter may indicate that an SCS of UE 115-c is less than an SCS of UE 115-d, wherein generating the signal includes adjusting a frequency domain comb factor used to generate the signal based on the parameter. In some cases, the parameter may indicate that an SCS of UE 115-c is less than an SCS of UE 115-d, wherein generating the signal may include adjusting a frequency domain comb offset used to generate the signal based on the parameter.

[0167] In some examples, the parameter may indicate that the SCS of UE 115-d is greater than the SCS of UE 115-c, wherein generating the signal includes adjusting the number of symbols of the signal based on the parameter. In some cases, generating the signal may include applying a rotation to at least one of the transmitted symbols to maintain phase continuity of the transmitted symbols. In some cases, applying the rotation may include a time domain rotation of at least one symbol or a frequency domain phase ramp of at least one symbol.

[0168] At 535, UE 115-d may measure a signal characteristic of a signal from UE 115-c based on the parameter and the type of CLI measurement. In some cases, the parameter may indicate that the SCS of UE 115-d is less than the SCS of UE 115-c. In this example, UE 115-d may adjust a frequency domain comb of a receiver based on the parameter. In some cases, UE 115-d may also adjust a frequency domain comb offset of a receiver based on the parameter.

[0169] In some cases, the parameter may indicate that the SCS of UE 115-d is greater than the SCS of UE 115-c, and measuring the signal characteristic may include adjusting the number of measurement symbols used to measure the signal characteristic based on the parameter. In some cases, UE 115-d may apply a rotation to at least one of the measurement symbols to demodulate the signal. In some cases, applying the rotation includes a time domain rotation for at least one symbol or a frequency domain phase ramp for at least one symbol. In some cases, the signal characteristic may be based on phase continuity between measurement symbols of the signal. At 540, UE 115-d may report the signal characteristic to base station 105-d.

[0170] Figure 6 A block diagram 600 of a device 605 supporting subcarrier spacing for UE-to-UE cross-link interference measurement according to aspects of the present disclosure is shown. The device 605 may be an example of aspects of the UE 115 as described herein. The device 605 may include a receiver 610, a communication manager 615, and a transmitter 620. The device 605 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0171] The receiver 610 may receive information 625, such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to subcarrier spacing for UE-to-UE cross-link interference measurement, etc.). The information 630 may be passed to other components of the device 605. The receiver 610 may be a reference Fig. 9 Receiver 610 may utilize a single antenna or a set of antennas. In some cases, some operations of communication manager 615 may be based on information 630 received from receiver 610. For example, information 630 may include a configuration for transmitting a CLIS RS, or a configuration for determining whether to measure a CSL I SRS transmitted by another UE 115.

[0172] The communication manager 615 can identify, at a first UE associated with a first subcarrier spacing, parameters for receiving a signal from a second UE with a second subcarrier spacing, determine a type of CLI measurement process to be performed, measure signal characteristics of the signal from the second UE based on the parameters and the type of CLI measurement process, and report the signal characteristics to a serving base station.

[0173] In some cases, the communication manager 615 can identify, at a first UE, parameters for sending a signal to a second UE, where the first UE is configured to communicate using a first subcarrier spacing and the second UE is configured to communicate using a second subcarrier spacing, generate a signal based on the parameters, and send the signal to the second UE.

[0174] In some cases, the communication manager 615 may receive, at a first UE configured to communicate using a first subcarrier spacing, a configuration for performing a CLI measurement on a signal sent from a second UE at a second subcarrier spacing, determine whether the second subcarrier spacing is different from the first subcarrier spacing, and avoid performing the CLI measurement if the second subcarrier spacing is different from the first subcarrier spacing. The communication manager 615 may be an example of aspects of the communication manager 910 described herein.

[0175] The communication manager 615 or its subcomponents may be implemented by hardware, code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 615 or its subcomponents may be performed by a general purpose processor, a DSP, an application specific integrated circuit (ASIC), an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

[0176] The communication manager 615 or its subcomponents can be physically located in a variety of locations, including being distributed so that portions of the functionality are implemented by one or more physical components at different physical locations. In some examples, the communication manager 615 or its subcomponents can be independent and distinct components according to various aspects of the present disclosure. In some examples, the communication manager 615 or its subcomponents can be combined with one or more other hardware components, including but not limited to input / output (I / O) components, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof according to various aspects of the present disclosure.

[0177] The transmitter 620 may transmit a signal 640 generated by other components of the device 605. The transmitter 620 may transmit the signal 640 based on the information 635 received from the communication manager 615. For example, the transmitter signal 640 may include a CLI SRS (which may be prepared for transmission based on the information 635) or a measurement report based on measuring the CLI SRS. In some examples, the transmitter 620 may be co-located with the receiver 610 in a transceiver module. For example, the transmitter 620 may be a reference Fig. 9 Examples of aspects of the transceiver 920 are described. The transmitter 620 may utilize a single antenna or a collection of antennas.

[0178] Figure 7A block diagram 700 of a device 705 supporting subcarrier spacing for UE-to-UE cross-link interference measurement according to aspects of the present disclosure is shown. The device 705 may be an example of aspects of the device 605 or UE 115 as described herein. The device 705 may include a receiver 710, a communication manager 715, and a transmitter 765. The device 705 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0179] The receiver 710 may receive information 770, such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to subcarrier spacing for UE-to-UE cross-link interference measurement, etc.). The information 775 may be passed to other components of the device 705. The receiver 710 may be a reference Fig. 9 Examples of aspects of the transceiver 920 are described. The receiver 710 may utilize a single antenna or a collection of antennas.

[0180] The communication manager 715 may be an example of aspects of the communication manager 615 as described herein. The communication manager 715 may include a CLI parameter component 720, a CLI measurement type component 725, a CLI signal measurement component 730, a measurement reporting component 735, a CLI signal generation component 740, and a CLI signal transmission component 745. The communication manager 715 may be an example of aspects of the communication manager 910 described herein.

[0181] In some cases, some operations of the communication manager 715 may be based on the information 775 received from the receiver 710. For example, the information 775 may include a configuration for transmitting a CLI SRS or a configuration for determining whether to monitor a CLI SRS.

[0182] The CLI parameter component 720 may identify, at a first UE associated with a first subcarrier spacing, parameters for receiving a signal from a second UE at a second subcarrier spacing. The CLI measurement type component 725 may determine a type of CLI measurement to be performed. The CLI signal measurement component 730 may measure a signal characteristic of a signal from the second UE based on the parameter and the type of CLI measurement. The measurement reporting component 735 may report the signal characteristic to a serving base station.

[0183] The CLI parameter component 720 can identify parameters for sending a signal to a second UE at a first UE, wherein the first UE is configured to communicate using a first subcarrier spacing and the second UE is configured to communicate using a second subcarrier spacing. The CLI signal generation component 740 can generate a signal based on the parameters. The CLI signal transmission component 745 can send a signal to the second UE.

[0184] The CLI configuration component 750 can receive, at a first UE configured to communicate using a first subcarrier spacing, a configuration for performing CLI measurements on a signal sent from a second UE at a second subcarrier spacing. The subcarrier spacing component 755 can determine whether the second subcarrier spacing is different from the first subcarrier spacing. If the second subcarrier spacing is different from the first subcarrier spacing, the measurement avoidance component 760 can avoid performing CLI measurements.

[0185] Transmitter 765 can transmit signals 785 generated by other components of device 705. In some examples, transmitter 765 can be co-located with receiver 710 in a transceiver module. For example, transmitter 765 can be a reference Fig. 9 780. The transmitter 765 may utilize a single antenna or a collection of antennas. The transmitter 765 may transmit a signal 785 based on the information 780 received from the communication manager 715. For example, the transmitted signal 785 may include a CLI SRS or a measurement report for a CLI SRS, which may be prepared for transmission based on the information 780.

[0186] Figure 8 A block diagram 800 of a communication manager 805 supporting subcarrier spacing for UE-to-UE cross-link interference measurements according to aspects of the present disclosure is shown. The communication manager 805 can be an example of aspects of the communication manager 615, the communication manager 715, or the communication manager 910 described herein. The communication manager 805 can include a CLI parameter component 810, a CLI measurement type component 815, a CLI signal measurement component 820, a measurement reporting component 825, a CLI signal generation component 830, and a CLI signal transmission component 835. Each of these modules can be in communication with each other directly or indirectly (e.g., via one or more buses).

[0187] The CLI parameter component 810 can identify, at a first UE associated with a first subcarrier spacing, parameters 812 for receiving a signal from a second UE at a second subcarrier spacing. In some cases, the first UE is served by a first cell of a first base station, and the second UE is served by a second cell of a second different base station. In some cases, the first UE and the second UE are served by the same cell. In some cases, the first UE is served by a first cell of a first base station, and the second UE is served by a second cell of a second different base station. The first UE 115 can send the parameters 812 for receiving to the CLI signal measurement component 820.

[0188] The CLI measurement type component 815 can determine a type of CLI measurement procedure to be performed. In some cases, the type of CLI measurement procedure includes a signal received power type CLI measurement procedure. In some cases, the type of CLI measurement procedure is based on the first subcarrier spacing being equal to the second subcarrier spacing. In some cases, the type of CLI measurement procedure is a total received power type CLI measurement procedure. In some cases, the type of CLI measurement procedure is based at least in part on the first subcarrier spacing being different from the second subcarrier spacing. In some cases, the CLI measurement type component 815 can send an indication 817 of the CLI measurement type to the CLI signal measurement component 820.

[0189] The CLI signal measuring component 820 can measure the signal characteristics of the signal 819 from the second UE based on the parameter 812 and the type of CLI measurement process (e.g., sent in the indication 817). In some examples, the CLI signal measuring component 820 can adjust the frequency domain comb factor of the receiver based on the parameter. In some examples, the CLI signal measuring component 820 can adjust the frequency domain comb offset of the receiver based on the parameter.

[0190] In some examples, the CLI signal measurement component 820 may adjust the number of measurement symbols used to measure the signal characteristic based on the parameter. In some examples, measuring the signal characteristic includes applying a rotation to at least one of the measurement symbols to demodulate the signal. In some examples, applying the rotation includes a time domain rotation of at least one symbol or a frequency domain phase ramp of at least one symbol. In some examples, the CLI signal measurement component 820 may measure the signal characteristic based on phase continuity between the measurement symbols of the signal. In some examples, the CLI signal measurement component 820 may receive a configuration of a dedicated measurement gap for a CLI measurement process, wherein the measurement gap is configured based in part on the type of the CLI measurement process, the first subcarrier spacing, and the second subcarrier spacing. In some cases, the CLI signal measurement component 820 may switch to the second subcarrier spacing for the measurement gap. The measurement reporting component 825 may report the signal characteristic 827 to the serving base station. In some cases, the measurement reporting component 825 may receive the signal characteristic in the indication 822 from the CLI signal measurement component 820.

[0191] In some examples, the CLI parameter component 810 can identify, at a first UE, a parameter 829 for sending a signal to a second UE, wherein the first UE is configured to communicate using a first subcarrier spacing and the second UE is configured to communicate using a second subcarrier spacing. The CLI signal generation component 830 can generate a signal 832 based on the parameter 829. In some examples, the CLI signal generation component 830 can adjust a frequency domain comb factor for generating a signal based on the parameter. In some examples, the CLI signal generation component 830 can adjust a frequency domain comb offset for generating a signal based on the parameter.

[0192] In some examples, the CLI signal generation component 830 can adjust the number of transmitted symbols of the signal based on the parameter. In some examples, generating the signal includes applying a rotation to at least one of the transmitted symbols to maintain phase continuity of the transmitted symbols. In some examples, applying the rotation includes a time domain rotation of at least one symbol or a frequency domain phase ramp of at least one symbol. The CLI signal transmission component 835 can send a signal 837 to the second UE.

[0193] CLI configuration component 840 can receive, at a first UE configured to communicate using a first subcarrier spacing, a configuration 842 for performing CLI measurements on a signal 844 sent from a second UE at a second subcarrier spacing. In some examples, if the second subcarrier spacing is the same as the first subcarrier spacing, CLI configuration component 840 can perform CLI measurements on the signal to obtain signal characteristics associated with the signal.

[0194] In some examples, CLI configuration component 840 can report the signal characteristics to the serving base station. In some examples, CLI configuration component 840 can receive a second configuration for performing a received power type CLI measurement at a second subcarrier spacing. In some examples, CLI configuration component 840 can perform a received power type CLI measurement at a second subcarrier spacing.

[0195] In some examples, the CLI configuration component 840 can report features measured from a received power type CLI measurement to a serving base station. In some cases, the configuration includes a first configuration associated with a signal received power type CLI measurement, and avoiding performing the CLI measurement is based on the signal received power type CLI measurement. In some cases, a first UE is served by a first cell of a first base station, and a second UE is served by a second cell of a second different base station. In some cases, the first UE and the second UE are served by the same cell. The subcarrier spacing component 845 can determine whether the second subcarrier spacing is different from the first subcarrier spacing. In some cases, the subcarrier spacing component 845 can determine that the subcarrier spacing is different based on an indication 847 received from the CLI configuration component. The subcarrier spacing component 845 can send an indication 849 of a different subcarrier spacing to the measurement avoidance component 850.

[0196] If the second subcarrier spacing is different from the first subcarrier spacing, the measurement avoiding component 850 can avoid performing (e.g., refrain from performing) the CLI measurement. The measurement gap component 855 can receive a measurement gap for performing the CLI measurement, wherein the measurement gap is configured based on the type of the CLI measurement, the first subcarrier spacing, and the second subcarrier spacing. In some cases, the measurement gap component 855 can receive an indication 857 of the measurement gap (e.g., from the base station 105). The measurement gap component 855 can send an indication 859 of the measurement gap to the measurement avoiding component 850 or the CLI configuring component 840 or both. In some examples, the measurement gap component 855 can switch to the second subcarrier spacing for the measurement gap. In some examples, the measurement gap component 855 can perform a CLI measurement of the signal from the second UE based on the type of the CLI measurement to obtain a signal characteristic of the signal. In some examples, the measurement gap component 855 can report the signal characteristic to the serving base station.

[0197] Fig. 9 A diagram of a system 900 including a device 905 supporting subcarrier spacing for UE-to-UE cross-link interference measurement according to aspects of the present disclosure is shown. The device 905 may be an example of or include components of a device 605, a device 705, or a UE 115 as described herein. The device 905 may include components for two-way voice and data communications, including components for sending and receiving communications, including a communication manager 910, an I / O controller 915, a transceiver 920, an antenna 925, a memory 930, and a processor 940. These components may be in electronic communication via one or more buses (e.g., a bus 945).

[0198] The communication manager 910 can identify, at a first UE associated with a first subcarrier spacing, a parameter for receiving a signal from a second UE at a second subcarrier spacing, determine a type of CLI measurement process to be performed, measure a signal characteristic of the signal from the second UE based on the parameter and the type of CLI measurement process, and report the signal characteristic to a serving base station. The communication manager 910 can also identify, at a first UE, a parameter for sending a signal to a second UE, wherein the first UE is configured to communicate using the first subcarrier spacing and the second UE is configured to communicate using the second subcarrier spacing, generate a signal based on the parameter, and send the signal to the second UE.

[0199] I / O controller 915 can manage input and output signals of device 905. I / O controller 915 can also manage peripheral devices that are not integrated into device 905. In some cases, I / O controller 915 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 915 can utilize a computer such as a Or another known operating system. In other cases, I / O controller 915 can be represented or interacted with by a modem, keyboard, mouse, touch screen, or similar device. In some cases, I / O controller 915 can be implemented as part of a processor. In some cases, a user can interact with device 905 via I / O controller 915 or via hardware components controlled by I / O controller 915.

[0200] The transceiver 920 can communicate bidirectionally via one or more antennas, wired or wireless links as described above. For example, the transceiver 920 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 920 can also include a modem for modulating packets and providing the modulated packets to an antenna for transmission, and demodulating packets received from an antenna.

[0201] In some cases, a wireless device may include a single antenna 925. However, in some cases, a device may have more than one antenna 925, which may be capable of transmitting or receiving multiple wireless transmissions simultaneously.

[0202] The memory 930 may include RAM and ROM. The memory 930 may store computer-readable computer executable code 935, which includes instructions that, when executed, cause the processor to perform various functions described herein. In some cases, the memory 930 may contain BIOS, etc., which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0203] The processor 940 may include an intelligent hardware device (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor 940 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into the processor 940. The processor 940 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 930) to cause the device 905 to perform various functions (e.g., functions or tasks that support subcarrier spacing for UE-to-UE cross-link interference measurements).

[0204] The code 935 may include instructions to implement aspects of the present disclosure, including instructions to support wireless communications. The code 935 may be stored in a non-transitory computer-readable medium such as a system memory or other type of memory. In some cases, the code 935 may not be directly executed by the processor 940, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0205] Fig.10 A block diagram 1000 of a device 1005 supporting subcarrier spacing for UE-to-UE cross-link interference measurement according to aspects of the present disclosure is shown. The device 1005 may be an example of aspects of a base station 105 as described herein. The device 1005 may include a receiver 1010, a communication manager 1015, and a transmitter 1020. The device 1005 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0206] The receiver 1010 may receive information 1025, such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to subcarrier spacing for UE-to-UE cross-link interference measurement, etc.). The information 1030 may be passed to other components of the device 1005. The receiver 1010 may be a reference Fig.13 Examples of aspects of the transceiver 1320 are described. The receiver 1010 may utilize a single antenna or a collection of antennas.

[0207] The communication manager 1015 may identify an overlap between a downlink symbol or a flexible symbol for the first UE and an uplink symbol for a second UE at a base station serving the first UE, wherein the first UE is configured to communicate using a first subcarrier spacing and the second UE is configured to communicate using a second subcarrier spacing, determine a type of CLI measurement to be performed by the first UE, send a configuration to the first UE for receiving a signal sent from the second UE with the second subcarrier spacing for CLI measurement, and receive signal characteristics measured by the first UE for CLI measurement.

[0208] The communication manager 1015 may also identify, at a base station serving a first UE, an overlap between uplink symbols for the first UE and downlink or flexible symbols for a second UE, wherein the first UE is configured to communicate using a first subcarrier spacing and the second UE is configured to communicate using a second subcarrier spacing, determine a type of CLI measurement to be performed by the second UE, and send a configuration to the first UE to send a signal to the second UE with the first subcarrier spacing to perform the CLI measurement. The communication manager 1015 may be an example of aspects of the communication manager 1310 described herein.

[0209] The communication manager 1015 or its subcomponents may be implemented by hardware, code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 1015 or its subcomponents may be performed by a general purpose processor, a DSP, an application specific integrated circuit (ASIC), an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

[0210] The communication manager 1015 or its subcomponents can be physically located in a variety of locations, including being distributed so that portions of the functionality are implemented by one or more physical components at different physical locations. In some examples, the communication manager 1015 or its subcomponents can be independent and distinct components according to various aspects of the present disclosure. In some examples, the communication manager 1015 or its subcomponents can be combined with one or more other hardware components, including but not limited to input / output (I / O) components, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof according to various aspects of the present disclosure.

[0211] The transmitter 1020 may transmit signals 1040 generated by other components of the device 1005. In some cases, the transmitter 1020 may generate the signals 1040 based on the operation of the communication manager 1015. For example, the communication manager 1015 may transmit information 1035 to configure the UE 115 to transmit or monitor the CLI SRS. In some examples, the transmitter 1020 may be co-located with the receiver 1010 in a transceiver module. For example, the transmitter 1020 may be a reference Fig.13 Examples of aspects of the transceiver 1320 are described. The transmitter 1020 may utilize a single antenna or a collection of antennas.

[0212] Fig.11 A block diagram 1100 of a device 1105 supporting subcarrier spacing for UE-to-UE cross-link interference measurement according to aspects of the present disclosure is shown. The device 1105 may be an example of aspects of the device 1005 or base station 105 as described herein. The device 1105 may include a receiver 1110, a communication manager 1115, and a transmitter 1145. The device 1105 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0213] The receiver 1110 may receive information 1155, such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to subcarrier spacing for UE-to-UE cross-link interference measurement, etc.). The information 1160 may be passed to other components of the device 1105. The receiver 1110 may be a reference Fig.13 Examples of aspects of transceiver 1320 are described. Receiver 1110 may utilize a single antenna or a collection of antennas.

[0214] The communication manager 1115 can be an example of aspects of the communication manager 1015 as described herein. The communication manager 1115 can include an overlap identification component 1120, a CLI measurement type component 1125, a receive parameter component 1130, a characteristic reporting component 1135, and a send parameter component 1140. The communication manager 1115 can be an example of aspects of the communication manager 1310 described herein.

[0215] The overlap identification component 1120 may identify an overlap between a downlink symbol or a flexible symbol for the first UE and an uplink symbol for a second UE at a base station serving the first UE, wherein the first UE is configured to communicate using a first subcarrier spacing and the second UE is configured to communicate using a second subcarrier spacing. The CLI measurement type component 1125 may determine the type of CLI measurement to be performed by the first UE. The reception parameter component 1130 may send a configuration to the first UE for receiving a signal sent from the second UE at the second subcarrier spacing for CLI measurement. The characteristic reporting component 1135 may receive a signal characteristic measured by the first UE for CLI measurement.

[0216] The overlap identification component 1120 may identify an overlap between an uplink symbol for a first UE and a downlink or flexible symbol for a second UE at a base station serving the first UE, wherein the first UE is configured to communicate using a first subcarrier spacing and the second UE is configured to communicate using a second subcarrier spacing. The CLI measurement type component 1125 may determine a type of CLI measurement to be performed by the second UE. The transmit parameter component 1140 may transmit to the first UE a configuration for a signal transmitted to the second UE at the first subcarrier spacing for CLI measurement.

[0217] The transmitter 1145 may transmit a signal 1170 generated by other components of the device 1105. For example, the transmitter 1145 may receive information 1165 from the communication manager 1115, and the signal 1170 may be based on the information 1165. For example, the information 1165 may include a configuration for the UE 115 to transmit, receive, or measure the CLI SRS, or a configuration for the UE 115 to send a measurement report for the CLI SRS. In some examples, the transmitter 1145 may be co-located with the receiver 1110 in a transceiver module. For example, the transmitter 1145 may be a reference Fig.13 Examples of aspects of the transceiver 1320 are described. The transmitter 1145 may utilize a single antenna or a collection of antennas.

[0218] Fig.12 A block diagram 1200 of a communication manager 1205 supporting subcarrier spacing for UE-to-UE cross-link interference measurements according to aspects of the present disclosure is shown. The communication manager 1205 can be an example of aspects of the communication manager 1015, the communication manager 1115, or the communication manager 1310 described herein. The communication manager 1205 can include an overlap identification component 1210, a CLI measurement type component 1215, a receive parameter component 1220, a characteristic reporting component 1225, a transmit parameter component 1230, and a symbol mode adjustment component 1235. Each of these modules can be in communication with each other directly or indirectly (e.g., via one or more buses).

[0219] The overlap identification component 1210 can identify an overlap between a downlink symbol or a flexible symbol for a first UE and an uplink symbol for a second UE at a base station serving the first UE, wherein the first UE is configured to communicate using a first subcarrier spacing and the second UE is configured to communicate using a second subcarrier spacing.

[0220] In some examples, the overlap identification component 1210 may identify an overlap between an uplink symbol for the first UE and a downlink or flexible symbol for the second UE at a base station serving the first UE, wherein the first UE is configured to communicate using a first subcarrier spacing and the second UE is configured to communicate using a second subcarrier spacing. In some cases, the base station serves the first UE via a first cell, and the second UE is served by a second cell of a second different base station. In some cases, the base station serves the first UE and the second UE via the same cell.

[0221] The CLI measurement type component 1215 can determine a type of CLI measurement to be performed by the first UE. In some examples, the overlap identification component 1210 can send an overlap indication 1240 of the identified symbol overlap, and the type of CLI measurement can be based on the identified symbol overlap. In some examples, the CLI measurement type component 1215 can determine a type of CLI measurement to be performed by the second UE. In some examples, the CLI measurement type component 1215 can determine that the type of CLI measurement is a signal received power type CLI measurement based on the first subcarrier spacing being equal to the second subcarrier spacing.

[0222] In some examples, CLI measurement type component 1215 can configure a dedicated measurement gap for CLI measurement based on the type of CLI measurement, the first subcarrier spacing, and the second subcarrier spacing. In some examples, CLI measurement type component 1215 can send an indicator of the dedicated measurement gap to the first UE.

[0223] In some examples, the CLI measurement type component 1215 may determine that the type of CLI measurement is a total received power type CLI measurement based on the first subcarrier spacing being different from the second subcarrier spacing. In some examples, the CLI measurement type component 1215 may determine that the type of CLI measurement is a signal received power type CLI measurement based on the first subcarrier spacing being equal to the second subcarrier spacing. In some examples, the CLI measurement type component 1215 may determine that the type of CLI measurement is a total received power type CLI measurement based on the first subcarrier spacing being different from the second subcarrier spacing. In some cases, the type of CLI measurement is a signal received power type CLI measurement, and the parameter includes a ratio of the second subcarrier spacing to the first subcarrier spacing. In some cases, the type of CLI measurement is an RSRP type CLI measurement, and the parameter includes a ratio of the second subcarrier spacing to the first subcarrier spacing.

[0224] Receive parameter component 1220 can send a configuration 1245 to the first UE for receiving a signal sent from the second UE at the second subcarrier spacing for CLI measurement. In some cases, configuration 1245 can be based on a measurement type to be performed by the first UE, which can be indicated to receive parameter component 1220 via indication 1250 from CLI measurement type component 1215. In some examples, configuration 1245 can include one or more parameters for receiving a signal.

[0225] The characteristic reporting component 1225 may receive a signal characteristic 1255 measured by the first UE for CLI measurement. In some cases, the characteristic reporting component 1225 may send signal characteristic information 1260 to the transmission parameter component 1230. The transmission parameter component 1230 may send a configuration 1265 for transmitting a signal to the second UE at a first subcarrier spacing to the first UE for CLI measurement. In some cases, the configuration 1265 may include one or more parameters for the transmission of the signal. The symbol mode adjustment component 1235 may adjust (e.g., via an adjustment indication 1270) the symbol mode of the first UE for a time slot including the transmission of the signal based on the first subcarrier spacing being different from the second subcarrier spacing. In some examples, the symbol mode adjustment may be performed based on the signal characteristic 1255 or the signal characteristic information 1260. In some cases, adjusting the symbol mode includes determining each symbol for the first UE that overlaps with a received symbol of the signal for the second UE as an uplink symbol.

[0226] Fig.13A diagram of a system 1300 including a device 1305 supporting subcarrier spacing for UE-to-UE cross-link interference measurement according to aspects of the present disclosure is shown. The device 1305 may be an example of or include components of the device 1005, device 1105, or base station 105 as described herein. The device 1305 may include components for two-way voice and data communications, including components for sending and receiving communications, including a communication manager 1310, a network communication manager 1315, a transceiver 1320, an antenna 1325, a memory 1330, a processor 1340, and an inter-station communication manager 1345. These components may be in electronic communication via one or more buses (e.g., bus 1350).

[0227] The communication manager 1310 may identify, at a base station serving a first UE, an overlap between a downlink symbol or a flexible symbol for the first UE and an uplink symbol for a second UE, wherein the first UE is configured to communicate using a first subcarrier spacing and the second UE is configured to communicate using a second subcarrier spacing, determine a type of CLI measurement to be performed by the first UE, send to the first UE a configuration for receiving a signal sent from the second UE with the second subcarrier spacing for CLI measurement, and receive signal characteristics measured by the first UE for CLI measurement.

[0228] The communication manager 1310 may also identify, at a base station serving the first UE, an overlap between uplink symbols for the first UE and downlink or flexible symbols for a second UE, wherein the first UE is configured to communicate using a first subcarrier spacing and the second UE is configured to communicate using a second subcarrier spacing, determine a type of CLI measurement to be performed by the second UE, and send a configuration to the first UE for sending a signal to the second UE with the first subcarrier spacing for CLI measurement.

[0229] The network communications manager 1315 may manage communications with the core network (eg, via one or more wired backhaul links). For example, the network communications manager 1315 may manage the delivery of data communications for client devices such as one or more UEs 115.

[0230] The transceiver 1320 can communicate bidirectionally via one or more antennas, wired or wireless links as described above. For example, the transceiver 1320 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 1320 can also include a modem for modulating packets and providing the modulated packets to an antenna for transmission, and demodulating packets received from an antenna.

[0231] In some cases, a wireless device may include a single antenna 1325. However, in some cases, a device may have more than one antenna 1325, which may be capable of transmitting or receiving multiple wireless transmissions simultaneously.

[0232] The memory 1330 may include RAM, ROM, or a combination thereof. The memory 1330 may store computer readable code 1335, which includes instructions that, when executed by a processor (e.g., processor 1340), cause the device to perform various functions described herein. In some cases, the memory 1330 may contain a BIOS, etc., which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0233] Processor 1340 may include an intelligent hardware device (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, processor 1340 may be configured to operate a memory array using a memory controller. In some cases, the memory controller may be integrated into processor 1340. Processor 1340 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1330) to cause device 1305 to perform various functions (e.g., functions or tasks that support subcarrier spacing for UE-to-UE cross-link interference measurements).

[0234] The inter-site communication manager 1345 may manage communications with other base stations 105 and may include a controller or scheduler for controlling communications with UE 115 in collaboration with other base stations 105. For example, the inter-site communication manager 1345 may coordinate scheduling of transmissions to UE 115 for various interference mitigation techniques such as beamforming or joint transmission. In some examples, the inter-site communication manager 1345 may provide an X2 interface within an LTE / LTE-A wireless communication network technology to provide communications between base stations 105.

[0235] The code 1335 may include instructions to implement aspects of the present disclosure, including instructions to support wireless communications. The code 1335 may be stored in a non-transitory computer-readable medium such as a system memory or other type of memory. In some cases, the code 1335 may not be directly executed by the processor 1340, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0236] Fig.14A flow chart illustrating a method 1400 for supporting subcarrier spacing for UE-to-UE cross-link interference measurement according to aspects of the present disclosure is shown. The operations of the method 1400 may be implemented by the UE 115 or a component thereof, as described herein. For example, the operations of the method 1400 may be performed by a communication manager, as described in reference to Figures 6 to 9 In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the functions described below.

[0237] At 1405, the UE may identify, at a first UE associated with a first subcarrier spacing, parameters for receiving a signal from a second UE at a second subcarrier spacing. The operations of 1405 may be performed according to the methods described herein. In some examples, aspects of the operations of 1405 may be as described in reference to Figures 6 to 9 The CLI parameters component to execute.

[0238] At 1410, the UE may determine the type of CLI measurement procedure to be performed or the type of CLI measurement to be performed. The operations of 1410 may be performed according to the methods described herein. In some examples, aspects of the operations of 1410 may be as described in reference to Figures 6 to 9 The CLI measurement component is used to perform the

[0239] At 1415, the UE may measure a signal characteristic of a signal from a second UE based on the parameter and the type of CLI measurement. The operations of 1415 may be performed according to the methods described herein. In some examples, aspects of the operations of 1415 may be as described in reference to Figures 6 to 9 The CLI signal measurement component is used to perform the measurement.

[0240] At 1420, the UE may report the signal characteristics to the serving base station. The operations of 1420 may be performed according to the methods described herein. In some examples, aspects of the operations of 1420 may be as described in reference to Figures 6 to 9 The measurement reporting component is used to perform the above operation.

[0241] Fig.15 A flow chart illustrating a method 1500 for supporting subcarrier spacing for UE-to-UE cross-link interference measurement according to aspects of the present disclosure is shown. The operations of the method 1500 may be implemented by the UE 115 or a component thereof, as described herein. For example, the operations of the method 1500 may be performed by a communication manager, as described with reference to Figures 6 to 9 In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the functions described below.

[0242] At 1505, the UE may identify, at a first UE, parameters for sending a signal to a second UE, wherein the first UE is configured to communicate using a first subcarrier spacing and the second UE is configured to communicate using a second subcarrier spacing. The operations of 1505 may be performed according to the methods described herein. In some examples, aspects of the operations of 1505 may be as described in reference to Figures 6 to 9 The CLI parameters component to execute.

[0243] At 1510, the UE may generate a signal based on the parameter. The operations of 1510 may be performed according to the methods described herein. In some examples, aspects of the operations of 1510 may be as described in reference to Figures 6 to 9 The CLI signal generation component is executed.

[0244] At 1515, the UE may send a signal to the second UE. The operations of 1515 may be performed according to the methods described herein. In some examples, aspects of the operations of 1515 may be as described in reference to Figures 6 to 9 The CLI signals the component to execute.

[0245] Fig.16 A flow chart illustrating a method 1600 for supporting subcarrier spacing for UE-to-UE cross-link interference measurement according to aspects of the present disclosure is shown. The operations of the method 1600 may be implemented by the base station 105 or components thereof, as described herein. For example, the operations of the method 1600 may be performed by a communication manager, as described in reference to Figure 10 to Figure 13 In some examples, the base station may execute a set of instructions to control functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform aspects of the functions described below.

[0246] At 1605, a base station may identify an overlap between a downlink symbol or a flexible symbol for a first UE and an uplink symbol for a second UE at a base station serving a first UE, wherein the first UE is configured to communicate using a first subcarrier spacing and the second UE is configured to communicate using a second subcarrier spacing. The operations of 1605 may be performed according to the methods described herein. In some examples, such as reference Figures 10 to 13 As described, aspects of the operation of 1605 may be performed by an overlapping identification component.

[0247] At 1610, the base station may determine a type of CLI measurement to be performed by the first UE. The operations of 1610 may be performed according to the methods described herein. In some examples, aspects of the operations of 1610 may be as described in reference to Figures 10 to 13 The CLI measurement component is used to perform the

[0248] At 1615, the base station may send a configuration to the first UE for receiving a signal sent from the second UE at the second subcarrier spacing for CLI measurement. The operation of 1615 may be performed according to the methods described herein. In some examples, aspects of the operation of 1615 may be as described in reference to Figures 10 to 13 The receiving parameter component is executed.

[0249] At 1620, the base station may receive signal characteristics measured by the first UE for CLI.

[0250] The operations of 1620 may be performed according to the methods described herein. In some examples, aspects of the operations of 1620 may be performed as described in reference to Figures 10 to 13 The characteristic reporting component is executed.

[0251] Fig.17 A flow chart illustrating a method 1700 for supporting subcarrier spacing for UE-to-UE cross-link interference measurement according to aspects of the present disclosure is shown. The operations of the method 1700 may be implemented by the base station 105 or components thereof, as described herein. For example, the operations of the method 1700 may be performed by a communication manager, as described with reference to Figure 10 to Figure 13 In some examples, the base station may execute a set of instructions to control functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform aspects of the functions described below.

[0252] At 1705, a base station may identify an overlap between an uplink symbol for a first UE and a downlink or flexible symbol for a second UE at a base station serving a first UE, wherein the first UE is configured to communicate using a first subcarrier spacing and the second UE is configured to communicate using a second subcarrier spacing. The operations of 1705 may be performed according to the methods described herein. In some examples, such as reference Figures 10 to 13 As described, aspects of the operation of 1705 may be performed by an overlapping identification component.

[0253] At 1710, the base station may determine a type of CLI measurement or a type of CLI measurement procedure to be performed by the second UE. The operations of 1710 may be performed according to the methods described herein. In some examples, aspects of the operations of 1710 may be as described in reference to Figures 10 to 13 The CLI measurement component is used to perform the

[0254] At 1715, the base station may send a configuration to the first UE for sending a signal to the second UE at the first subcarrier spacing for performing a CLI measurement procedure. The operation of 1715 may be performed according to the methods described herein. In some examples, aspects of the operation of 1715 may be as described in reference to Figures 10 to 13 The sending parameter component is used to execute.

[0255] Fig.18 A flow chart illustrating a method 1800 for supporting subcarrier spacing for UE-to-UE cross-link interference measurement according to aspects of the present disclosure is shown. The operations of the method 1800 may be implemented by the UE 115 or a component thereof, as described herein. For example, the operations of the method 1800 may be performed by a communication manager, as described with reference to Figures 6 to 9 In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the functions described below.

[0256] At 1805, the UE may receive, at a first UE configured to communicate using a first subcarrier spacing, a configuration for performing CLI measurements on a signal sent from a second UE at a second subcarrier spacing. The operations of 1805 may be performed according to the methods described herein. In some examples, aspects of the operations of 1805 may be as described with reference to Figures 6 to 9 The CLI configuration component is executed.

[0257] At 1810, the UE may determine whether the second subcarrier spacing is different from the first subcarrier spacing. The operations of 1810 may be performed according to the methods described herein. In some examples, aspects of the operations of 1810 may be as described in reference to Figures 6 to 9 The subcarrier spacing component is used to perform.

[0258] At 1815, if the second subcarrier spacing is different from the first subcarrier spacing, the UE may avoid performing CLI measurements. The operations of 1815 may be performed according to the methods described herein. In some examples, aspects of the operations of 1815 may be as described in reference to Figures 6 to 9 The measurements described are performed by component avoidance.

[0259] Fig.19 A flow chart illustrating a method 1900 for supporting subcarrier spacing for UE-to-UE cross-link interference measurement according to aspects of the present disclosure is shown. The operations of the method 1900 may be implemented by the UE 115 or a component thereof, as described herein. For example, the operations of the method 1900 may be performed by a communication manager, as described with reference to Figures 6 to 9 In some examples, the UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the functions described below.

[0260] At 1905, the UE may receive a CLI measurement configuration. The UE may be a first UE configured to communicate using a first subcarrier spacing, and the CLI measurement configuration may be a configuration for performing CLI measurements on a signal sent from a second UE at a second subcarrier spacing. The operations of 1905 may be performed according to the methods described herein. In some examples, aspects of the operations of 1905 may be as described with reference to Figures 6 to 9 The CLI configuration component is executed.

[0261] At 1910, the UE may determine that the SCS does not match the CLI measurement. For example, the UE may determine that the second subcarrier spacing is different from the first subcarrier spacing. The operations of 1910 may be performed according to the methods described herein. In some examples, aspects of the operations of 1910 may be as described in reference to Figures 6 to 9 The subcarrier spacing component is used to perform.

[0262] At 1915, the UE may avoid performing CLI measurements. For example, the UE may avoid performing CLI measurements based on determining that the second subcarrier spacing is different from the first subcarrier spacing. For example, the UE may be configured to perform some CLI measurements only when the SCS of the transmitter matches the SCS of the receiver. The operations of 1915 may be performed according to the methods described herein. In some examples, aspects of the operations of 1915 may be as described in reference to Figures 6 to 9 The measurements described are performed by component avoidance.

[0263] It should be noted that the methods described herein describe possible implementations, and that operations and steps may be rearranged or otherwise modified, and other implementations are possible. Furthermore, aspects from two or more methods may be combined.

[0264] The techniques described herein may be used for various wireless communication systems such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and other systems. A CDMA system may implement a radio technology such as CDMA2000, Universal Terrestrial Radio Access (UTRA), etc. CDMA2000 covers IS-

[0265] The IS-2000, IS-95 and IS-856 standards. The IS-2000 version may be generally referred to as CDMA2000 1X, 1X, etc. IS-856 (TIA-856) is generally referred to as CDMA2000 1xEV-DO, High Rate Packet Data (HRPD), etc. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. A TDMA system may implement a radio technology such as Global System for Mobile Communications (GSM).

[0266] An OFDMA system may implement radio technologies such as Ultra Mobile Broadband (UMB), Evolved UTRA (E-UTRA), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, etc. UTRA and E-UTRA are part of Universal Mobile Telecommunications System (UMTS). LTE, LTE-A, and LTE-A Pro are versions of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, LTE-APro, NR, and GSM are described in documents from an organization named "3rd Generation Partnership Project" (3GPP). CDMA2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP).

[0267] The techniques described herein may be used for the systems and radio technologies mentioned herein as well as other systems and radio technologies. Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for example purposes, and the terminology LTE, LTE-A, LTE-A Pro, or NR may be used in much of the description, the techniques described herein are applicable to applications other than LTE, LTE-A, LTE-A Pro, or NR applications.

[0268] A macro cell typically covers a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access to a UE through a service subscription with a network provider. A small cell may be associated with a base station with lower power than a macro cell, and the small cell may operate in the same or different (e.g., licensed, unlicensed, etc.) frequency band as a macro cell. According to various examples, a small cell may include a pico cell, a femto cell, and a micro cell. For example, a pico cell may cover a small geographic area and may allow unrestricted access to a UE through a service subscription with a network provider. A femto cell may also cover a small geographic area (e.g., a home) and may provide restricted access to a UE associated with the femto cell (e.g., a UE in a closed subscriber group (CSG), a UE for a user in a home, etc.). An eNB for a macro cell may be referred to as a macro eNB. An eNB for a small cell may be referred to as a small cell eNB, a pico eNB, a femto eNB, or a home eNB. An eNB may support one or more (e.g., two, three, four, etc.) cells and may also support communications using one or more component carriers.

[0269] The wireless communication systems described herein may support synchronous or asynchronous operation. For synchronous operation, the base stations may have similar frame timing, and transmissions from different base stations may be approximately aligned in time. For asynchronous operation, the base stations may have different frame timing, and transmissions from different base stations may not be aligned in time. The techniques described herein may be used for synchronous or asynchronous operation.

[0270] The information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltage, current, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0271] The various illustrative blocks and modules described in conjunction with the disclosure herein may be implemented or executed using a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in an alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in combination with a DSP core, or any other such configuration.

[0272] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted on a computer-readable medium as one or more instructions or codes. Other examples and implementations are within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hard wiring, or any combination of these. Features that implement the functions may also be physically located in various locations, including being distributed so that portions of the functions are implemented in different physical locations.

[0273] Computer readable medium includes both non-transitory computer storage medium and communication medium, and computer storage medium and communication medium include any medium that helps to transfer computer program from one place to another place.Non-transitory storage medium can be any available medium that can be accessed by general or special-purpose computer.As an example and not limitation, non-transitory computer readable medium may include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), flash memory, compact disk (CD) ROM or other compact disk storage, disk storage or other magnetic storage device or can be used for carrying or storing required program code mode in the form of instruction or data structure and can be accessed by general or special-purpose computer or general or special-purpose processor Any other non-transitory medium.In addition, any connection is appropriately referred to as computer readable medium.For example, if coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wireless technology (such as infrared, radio and microwave) are used to send software from website, server or other remote source, coaxial cable, fiber optic cable, twisted pair, DSL or wireless technology (such as infrared, radio and microwave) are included in the definition of medium. Disk and disc, as used herein, includes CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc, where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

[0274] As used herein, including in the claims, "or" as used in a list of items (e.g., a list of items preceded by a phrase such as "at least one" or "one or more"), indicates an inclusive list, so that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). In addition, as used herein, the phrase "based on" should not be interpreted as a reference to a closed set of conditions. For example, an exemplary step described as "based on condition A" can be based on both condition A and condition B without departing from the scope of this disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on."

[0275] In the drawings, similar components or features may have the same reference label. In addition, various components of the same type may be distinguished by following the reference label with a dash and a second label that distinguishes between similar components. If only the first reference label is used in the specification, the specification applies to any one similar component having the same first reference label, regardless of the second reference label or other subsequent reference labels.

[0276] The descriptions set forth herein in conjunction with the accompanying drawings describe example configurations and do not represent all examples that may be implemented or within the scope of the claims. The term "exemplary" as used herein means "serving as an example, instance, or illustration," rather than "preferred" or "superior to other examples." For the purpose of providing an understanding of the described technology, the detailed description includes specific details. However, the technologies may be practiced without these specific details. In some cases, in order to avoid obscuring the concepts of the described examples, known structures and devices are shown in block diagram form.

[0277] The description provided herein enables those skilled in the art to make or use the present disclosure. Various modifications to the present disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Therefore, the present disclosure is not limited to the examples and designs described herein, but conforms to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication, comprising: At a first user equipment (UE) configured to communicate using a first subcarrier spacing, receiving a configuration for performing a cross-link interference (CLI) measurement on a signal transmitted from a second UE at a second subcarrier spacing; determining whether the second subcarrier spacing is different from the first subcarrier spacing; and If the second subcarrier spacing is different from the first subcarrier spacing, avoiding performing the CLI measurement.

2. The method according to claim 1, further comprising: If the second subcarrier spacing is the same as the first subcarrier spacing, performing the CLI measurement on the signal to obtain a signal characteristic associated with the signal; as well as The signal characteristics are reported to a serving base station.

3. The method of claim 1 , wherein the configuration comprises a first configuration associated with a signal received power type CLI measurement, and refraining from performing the CLI measurement based at least in part on the signal received power type CLI measurement.

4. The method according to claim 3, further comprising: receiving a second configuration for performing a received power type CLI measurement with the second subcarrier spacing; performing the received power type CLI measurement with the second subcarrier spacing; as well as The characteristics measured from the received power type CLI measurement are reported to a serving base station. 5 . The method of claim 1 , wherein the first UE is served by a first cell of a first base station and the second UE is served by a second cell of a second, different base station. The method of claim 1 , wherein the first UE and the second UE are served by the same cell.

7. The method according to claim 1, further comprising: receiving a measurement gap for performing the CLI measurement, wherein the measurement gap is configured based at least in part on a type of the CLI measurement, the first subcarrier spacing, and the second subcarrier spacing; switching to a second subcarrier spacing for the measurement gap; performing the CLI measurement on the signal from the second UE to obtain a signal characteristic of the signal based at least in part on a type of the CLI measurement; as well as The signal characteristics are reported to a serving base station.

8. A method for wireless communication, comprising: identifying, at a base station serving a first user equipment (UE), an overlap between a downlink symbol or a flexible symbol for the first UE and an uplink symbol for a second UE, wherein the first UE is configured to communicate using a first subcarrier spacing and the second UE is configured to communicate using a second subcarrier spacing; determining a type of cross-link interference (CLI) measurement to be performed by the first UE based at least in part on the first subcarrier spacing and the second subcarrier spacing; sending, to the first UE, a configuration for receiving a signal sent from the second UE at the second subcarrier spacing, to perform the CLI measurement; and A signal characteristic measured by the first UE is received to perform the CLI measurement.

9. The method according to claim 8, further comprising: Based at least in part on the first subcarrier spacing being different from the second subcarrier spacing, determining that the type of the CLI measurement is a total received power type CLI measurement.

10. The method of claim 8, wherein the type of CLI measurement is a signal received power type CLI measurement, and the configuring is based at least in part on a ratio of the second subcarrier spacing to the first subcarrier spacing.

11. The method according to claim 8, further comprising: Based at least in part on the first subcarrier spacing being equal to the second subcarrier spacing, determining that the type of the CLI measurement is a signal received power type CLI measurement.

12. The method of claim 8, wherein the base station serves the first UE via a first cell, and the second UE is served by a second cell of a second different base station.

13. The method of claim 8, wherein the base station serves the first UE and the second UE via the same cell.

14. The method of claim 8, wherein sending the configuration comprises: configuring a measurement gap for the second UE to perform the CLI measurement based at least in part on a type of the CLI measurement, the first subcarrier spacing, and the second subcarrier spacing; and Sending an indicator of the measurement gap to the first UE.

15. A method for wireless communication, comprising: identifying, at a base station serving a first user equipment (UE), an overlap between uplink symbols for the first UE and downlink or flexible symbols for a second UE, wherein the first UE is configured to communicate using a first subcarrier spacing and the second UE is configured to communicate using a second subcarrier spacing; determining a type of cross-link interference (CLI) measurement to be performed by the second UE; as well as Sending to the first UE a configuration for sending a signal to the second UE with the first subcarrier spacing to perform the CLI measurement.

16. The method according to claim 15, further comprising: Based at least in part on the first subcarrier spacing being different than the second subcarrier spacing, a symbol pattern of the first UE is adjusted for a time slot including transmission of the signal.

17. The method of claim 16, wherein the adjusting the symbol pattern comprises determining each symbol for the first UE that overlaps with a received symbol of a signal for the second UE as an uplink symbol.

18. The method of claim 15, wherein the base station serves the first UE via a first cell, and the second UE is served by a second cell of a second different base station.

19. The method of claim 15, wherein the base station serves the first UE and the second UE via the same cell.

20. An apparatus for wireless communication, comprising: means for receiving, at a first user equipment (UE) configured to communicate using a first subcarrier spacing, a configuration for performing cross-link interference (CLI) measurements on a signal transmitted from a second UE at a second subcarrier spacing; means for determining whether the second subcarrier spacing is different from the first subcarrier spacing; as well as means for refraining from performing the CLI measurement if the second subcarrier spacing is different from the first subcarrier spacing.

21. The apparatus according to claim 20, further comprising: means for performing the CLI measurement on the signal to obtain a signal characteristic associated with the signal if the second subcarrier spacing is the same as the first subcarrier spacing; as well as Means for reporting said signal characteristics to a serving base station.

22. The apparatus of claim 20, wherein the configuration comprises a first configuration associated with a signal received power type CLI measurement, and wherein performing the CLI measurement is refrained from based at least in part on the signal received power type CLI measurement.

23. The apparatus according to claim 22, further comprising: means for receiving a second configuration for performing received power type CLI measurements with said second subcarrier spacing; means for performing said received power type CLI measurement at said second subcarrier spacing; as well as Means for reporting to a serving base station characteristics measured from said received power type CLI measurement.

24. The apparatus of claim 20, wherein the first UE is served by a first cell of a first base station and the second UE is served by a second cell of a second, different base station.

25. The apparatus of claim 20, wherein the first UE and the second UE are served by the same cell.

26. The apparatus of claim 20, further comprising: means for receiving a measurement gap for performing the CLI measurement, wherein the measurement gap is configured based at least in part on a type of the CLI measurement, the first subcarrier spacing, and the second subcarrier spacing; means for switching to a second subcarrier spacing for said measurement gap; means for performing the CLI measurement on the signal from the second UE to obtain a signal characteristic of the signal based at least in part on a type of the CLI measurement; as well as Means for reporting said signal characteristics to a serving base station.

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