Wireless UE AGC Tuning for Cross-Link Interference Measurement
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Solution Overview
Problem
Cross-link interference (CLI) in wireless communication systems causes analog-to-digital converter (ADC) saturation in user equipment (UE), leading to unstable communication and impaired CLI measurement in 6G communication systems.
Innovation Solution
A method and device for cross-link interference-reference signal (CLI-RS) resource allocation and automatic gain control (AGC) tuning are implemented to prevent ADC saturation by controlling input signal levels and measuring CLI, using control information exchanged between UEs and a base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex technology is used to enhance frequency efficiency in 6G communication systems, then uplink and downlink can simultaneously utilize the same frequency resource, but cross-link interference occurs between user equipments causing ADC saturation and unstable communication
Solution Approach 1:
The patent applies preliminary action by performing AGC tuning before CLI measurement. The base station first transmits AGC tuning signals to adjust the receiver gain of user equipment, ensuring the ADC operates within its linear range. Only after this preliminary gain adjustment are CLI measurement signals transmitted and measured, preventing ADC saturation that would occur if measurement were performed without prior gain control.
Solution Approach 2:
The patent employs parameter changes by dynamically adjusting the receiver gain parameter through AGC tuning based on the received signal strength. The base station measures the power of AGC tuning signals and configures appropriate gain values, then transmits these gain configuration parameters to user equipment. This parameter adjustment ensures that subsequent CLI measurements are performed under optimal conditions without ADC saturation.
2Device complexity
If CLI measurement is performed without AGC tuning, then the measurement process is simplified, but ADC saturation occurs leading to impaired CLI measurement accuracy
Solution Approach 1:
The patent applies preliminary action by performing AGC tuning before CLI measurement. The base station first transmits AGC tuning signals to adjust the receiver gain of user equipment, ensuring the ADC operates within its linear range. Only after this preliminary gain adjustment are CLI measurement signals transmitted and measured, preventing ADC saturation that would occur if measurement were performed without prior gain control.
Solution Approach 2:
The patent implements feedback by having user equipment report received signal strength indicators (RSSI) for AGC tuning signals to the base station. The base station uses this feedback information to determine appropriate gain values and configure the AGC accordingly. This closed-loop feedback mechanism ensures optimal gain settings are established before CLI measurements begin, improving measurement accuracy without significantly increasing overall system complexity.
Data Source
AI summary
The disclosure relates to a 5th-generation (5G) or 6th-generation (6G) communication system for supporting a higher data transmission rate. A method performed by a first user equipment (UE) in a wireless communication system in which cross-link interference (CLI) exists is provided. The method includes receiving, from a base station, control information related to automatic gain control (AGC) tuning and CLI measurement, receiving, from a second UE, a first signal for the AGC tuning based on the control information, controlling an input signal level of an analog-to-digital converter (ADC) in the first UE based on the first signal, receiving, from the second UE, a second signal for the CLI measurement based on the control information, and transmitting, to the base station, a report message including a CLI measurement result measured based on the second signal.