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EP-4738772-A2 - SUBCARRIER SPACING FOR UE-TO-UE CROSS LINK INTERFERENCE MEASUREMENT

EP4738772A2EP 4738772 A2EP4738772 A2EP 4738772A2EP-4738772-A2

Abstract

Methods, systems, and devices for wireless communications 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 UEs 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 stations may configure the UEs with one or more parameters for generating and measuring a signal used to manage the CLI. The parameters may be based on the uplink SCS of the aggressor and the downlink SCS of the victim. The aggressor UE may apply the parameters to generate the CLI measurement signal, and the victim UE may apply the parameters to measure the CLI measurement signal, so the signal from the transmitter fits into the resource grid of the receiver.

Inventors

  • XU, HUILIN
  • MANOLAKOS, Alexandros
  • JI, TINGFANG

Assignees

  • QUALCOMM Incorporated

Dates

Publication Date
20260506
Application Date
20200110

Claims (4)

  1. A user equipment, UE, comprising: one or more memories storing processor-executable code; and one processor, or multiple processors collectively, coupled with the one or more memories and operable to execute the code to cause the UE to: receive, a configuration for performing a reference signal receive power, RSRP-type cross-link interference, CLI, measurement of a signal, wherein the UE is configured for communication using a first subcarrier spacing of an active downlink bandwidth part of the UE and the configuration indicates a second subcarrier spacing associated with the signal, and wherein a requirement to perform the RSRP-type CLI measurement is not applied based at least in part on the second subcarrier spacing being different from the first subcarrier spacing; receive a second configuration for performing a receive signal strength indicator, RSSI-type CLI measurement at a subcarrier spacing of an aggressor UE; and perform the RSSI-type CLI measurement based at least in part on the subcarrier spacing of the aggressor UE and the first subcarrier spacing being the same or different in accordance with the second configuration for performing the RSSI-type CLI measurement.
  2. The UE of claim 1, wherein the one processor is, or the multiple processors collectively are, operable to execute the code to cause the UE to: report a characteristic measured from the RSSI-type CLI measurement to a serving network device.
  3. A method for wireless communications, comprising: receiving, at a user equipment, UE, configured for communication using a first subcarrier spacing of an active downlink bandwidth part of the UE, a configuration for performing a reference signal receive power, RSRP-type cross-link interference, CLI, measurement of a signal, wherein the configuration indicates a second subcarrier spacing associated with the signal, and wherein a requirement to perform the RSRP-type CLI measurement is not applied based at least in part on the second subcarrier spacing being different from the first subcarrier spacing; receiving a second configuration for performing a receive signal strength indicator, RSSI-type CLI measurement at a subcarrier spacing of an aggressor UE; and performing the RSSI-type CLI measurement based at least in part on the subcarrier spacing of the aggressor UE and the first subcarrier spacing being the same or different in accordance with the second configuration for performing the RSSI-type CLI measurement.
  4. The method of claim 3, further comprising: reporting a characteristic measured from the RSSI-type CLI measurement to a serving network device.

Description

CROSS REFERENCE The present Application for Patent claims priority to U.S. Patent Application No. 16738969 by XU et al., entitled "SUBCARRIER SPACING FOR UE-TO-UE CROSS LINK INTERFERENCE MEASUREMENT," filed January 9, 2020, and Greece Provisional Patent Application No. 20190100018 by XU, et al., entitled "SUBCARRIER SPACING FOR UE-TO-UE CROSS LINK INTERFERENCE MEASUREMENT," filed January 11, 2019, each of which is assigned to the assignee hereof. BACKGROUND The following relates generally to wireless communications, and more specifically to subcarrier spacing for UE-to-UE cross link interference measurement. Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power). Examples of such multiple-access systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which may be referred to as New Radio (NR) systems. These systems may employ technologies such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple-access communications system may include a number of base stations or network access nodes, each simultaneously supporting communication for multiple communication devices, which may be otherwise known as user equipment (UE). Neighboring cells in a time domain duplexed (TDD) system may use different configurations for TDD communications. In some cases, the different TDD configurations may lead to overlap for transmission in opposite directions. For example, an uplink transmission by a first UE may interfere with downlink reception at a second UE if the uplink transmission and downlink reception are scheduled for the same time. Interference between UEs associated with different TDD configurations in a TDD system may be known as cross-link interference (CLI). Current techniques for managing CLI in a TDD system may result in inefficient use of communication resources. SUMMARY The described techniques relate to improved methods, systems, devices, and apparatuses that support subcarrier spacing (SCS) for user equipment (UE)-to-UE cross-link interference (CLI) measurement. Generally, the described techniques provide for applying a transmission configuration at a transmitting UE and a reception configuration at a receiving UE such that the transmitting UE can transmit a signal used for CLI management to the receiving UE, even if the transmitting UE and the receiving UE have different SCS. SCS for a UE in a cell may be configured by a base station providing the cell. SCS may be configured per cell or per bandwidth part (BWP), where the SCS configuration is indicated to the UE via higher layer signaling, such as radio resource control (RRC) signaling. SCS may also be separately configured for uplink communications and downlink communications. Based on the independent and separate configuration of SCS, the uplink SCS of a first UE may be different from the downlink SCS of a 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 result in CLI, an aggressor UE may transmit a signal (e.g., a reference signal) to be measured by a 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 be unable to successfully receive the signal and perform the measurement. To enable measuring CLI for UEs with different SCS configurations, the UEs involved in the CLI measurement may apply parameters associated with transmission or reception of signals used for the CLI measurement (e.g., reference signals). The parameters may be provided by the serving base station(s) (e.g., in a configuration), and the UEs may adjust their transmission or reception configurations such that the uplink subcarriers of transmitting UEs align with downlink subcarriers of receiving UEs. Additionally, or alternatively, the UEs may apply the parameters such that the signal symbols of the UE with the higher SCS are repeated to match the symbol duration of the UE with the lower SCS. The parameters may include indicators for a 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, a number of measurement OFDM symbols, an amount of phase shifting, or any combination thereof. In some cases, some of the parameters may be based on a ratio between