Uplink Metric Reporting via Cross-Link Interference Detection
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Solution Overview
Problem
Current wireless communication systems face challenges in accurately and reliably reporting uplink metrics, particularly due to cross-link interference, which can lead to inefficiencies and increased latency in full-duplex operations.
Innovation Solution
A method where a first user equipment (UE) receives a pathloss reference signal from a second UE, determines cross-link interference, adjusts its transmit power setting, and transmits an uplink metric report to the base station, including metrics such as power headroom or power management maximum power reduction, to mitigate interference and improve channel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex communications are established between base station and multiple UEs, then spectral efficiency and throughput are improved, but cross-link interference between UEs increases
Solution Approach 1:
The base station proactively configures pathloss reference signals and interference measurement resources before full-duplex communication begins. UEs are pre-configured with measurement configurations and reporting settings, enabling them to measure and report cross-link interference conditions in advance, allowing the base station to adjust scheduling and power settings before interference becomes problematic.
Solution Approach 2:
The patent implements a feedback mechanism where UEs measure cross-link interference using pathloss reference signals and report these measurements to the base station. The base station uses this feedback information to dynamically adjust uplink power settings, scheduling decisions, and full-duplex operation parameters, creating a closed-loop system that continuously optimizes performance while managing interference.
2Ease of operation
If uplink metric reporting is performed without considering cross-link interference, then reporting simplicity is maintained, but accuracy and reliability of uplink metrics deteriorate
Solution Approach 1:
The patent introduces pathloss reference signals as intermediary measurement resources that UEs use to assess cross-link interference conditions. These reference signals serve as a mediator between the physical interference environment and the uplink metric reporting process, enabling UEs to incorporate interference information into their reports without fundamentally changing the reporting mechanism itself.
Solution Approach 2:
The patent modifies uplink metric parameters by incorporating cross-link interference measurements into power headroom reports and other uplink metric calculations. UEs adjust reported power values based on measured interference levels, changing the parameters they report to reflect actual channel conditions while maintaining compatibility with existing base station processing.
3Productivity
If transmit power is increased to improve uplink throughput, then data rate increases, but cross-link interference to other UEs increases
Solution Approach 1:
The patent implements dynamic transmit power adjustment where UEs continuously adapt their power settings based on real-time cross-link interference measurements and base station feedback. Power levels are not fixed but dynamically optimized to achieve the highest possible throughput while maintaining interference below acceptable thresholds, allowing the system to respond to changing channel conditions.
Solution Approach 2:
The patent changes the transmit power parameter based on measured cross-link interference conditions. UEs adjust their power settings by modifying key parameters such as power headroom and maximum power reduction values, enabling flexible power control that optimizes throughput while managing interference to other users in the network.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. The method may include a base station establishing full-duplex communications with a first user equipment (UE) and a second UE. The method may include the first UE receiving an interference threshold from the base station, receiving a pathloss reference signal from the second UE, and determining cross-link interference between the first UE and the second UE based on the pathloss reference signal. The method may include the first UE adjusting a transmit power setting of the first UE in accordance with the cross-link interference and transmitting to the base station an uplink metric report, the uplink metric report including an uplink metric of the first UE that is based on the adjusted transmit power setting of the first UE.