Reciprocity-Based UE Uplink Power Control for Cross-Link Interference
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Solution Overview
Problem
In wireless communications systems, cross-link interference (CLI) occurs when UEs with different timing or resource configurations interfere with each other, leading to increased interference and communication issues, with existing solutions failing to effectively manage this reciprocity-based interference.
Innovation Solution
A method for a first UE to adjust its uplink transmission power based on CLI measurements and pathloss estimation with a second UE, using reciprocity-based configurations and indications from a base station to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UEs transmit signals in overlapping time resources with different configurations, then communication flexibility and resource utilization are improved, but cross-link interference increases between UEs
Solution Approach 1:
The patent implements feedback mechanisms where UEs measure CLI from other UEs and report these measurements to the base station. The base station then adjusts uplink power control parameters based on this feedback to mitigate interference while maintaining flexible resource allocation. This closed-loop feedback system enables dynamic adaptation to interference conditions.
Solution Approach 2:
The patent dynamically changes power control parameters (such as pathloss reference signals and power adjustment factors) based on measured CLI conditions. By adjusting these parameters in response to interference measurements, the system maintains communication flexibility while adapting power levels to reduce cross-link interference between UEs with different configurations.
2Adaptability or versatility
If UEs use different timing configurations to support diverse communication needs, then service diversity is improved, but interference management complexity increases
Solution Approach 1:
The base station acts as an intermediary that coordinates timing configurations and power control parameters for UEs with different service requirements. It receives CLI measurements from UEs, processes this information, and sends adjusted power control commands to mitigate interference. This intermediary approach simplifies the complexity by centralizing interference management while allowing diverse timing configurations.
Solution Approach 2:
The system performs preliminary power control adjustments based on configured pathloss reference signals before actual data transmission. By pre-configuring power parameters and performing initial interference measurements, the system reduces the complexity of real-time interference management while supporting diverse timing configurations for different services.
3Reliability
If uplink transmission power is increased to overcome pathloss, then communication reliability is improved, but cross-link interference to other UEs worsens
Solution Approach 1:
The patent applies local quality by configuring UE-specific pathloss reference signals and power control parameters tailored to each UE's local interference environment. Instead of uniform power control, each UE adjusts its power based on its specific CLI measurements and configured parameters, achieving reliable communication for each link while minimizing overall interference through localized optimization.
Solution Approach 2:
The system implements dynamic power control where uplink transmission power is continuously adjusted based on real-time CLI measurements and base station commands. This dynamic adjustment allows the system to maintain communication reliability by increasing power when needed while reducing power to minimize cross-link interference, adapting continuously to changing conditions rather than using fixed power levels.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A first user equipment (UE) may receive, from a base station, a configuration indicating an interference reciprocity between the first UE and a second UE, where the interference reciprocity is associated with cross link interference (CLI) between the first UE and the second UE. The first UE may also receive, from the base station, an indication of a transmit power of the second UE. The first UE may measure a pathloss associated with the CLI between the first UE and the second UE based at least in part on the received transmit power of the second UE. The first UE may determine a transmit power for transmission of one or more uplink messages based at least in part on the measured pathloss and transmit the uplink messaged using the determined transmit power.