UE Power Control for Shared Spectrum Interference

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Solution Overview

Problem

Current wireless communication systems face challenges in managing interference between overlapping networks with different priority levels, particularly in shared spectrum scenarios, where precise location information and accurate channel models are difficult to obtain due to mobility and changing conditions, leading to potential interference that affects the ability to provide high-priority traffic like eURLLC services.

Innovation Solution

The system allows user equipment (UE) and base stations in a first network to independently adjust their transmit power levels based on detecting neighboring networks with higher priority, by receiving power control and reference signal measurement configurations, and using these to determine and adjust transmission power limits to maintain interference below a threshold level, thereby preventing interference with higher priority networks.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If wireless devices operate in shared spectrum without interference coordination, then spectrum utilization and network coverage are improved, but interference between overlapping networks deteriorates

Engineering Contradiction:

Improvespectrum utilizationVSAvoidinterference

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent implements a feedback mechanism where UEs measure reference signals from neighboring networks and report interference levels to the serving base station. The base station uses this feedback to dynamically adjust transmit power levels, creating a closed-loop interference management system that adapts to changing spectrum conditions.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent introduces dynamic power control where transmit power levels are not fixed but continuously adjusted based on real-time interference measurements. The system dynamically modifies power spectral density limits and transmission parameters to optimize spectrum sharing between overlapping networks.

Inventive Principle:

Principle #15Dynamics

2Reliability

If transmit power levels are increased to maintain signal quality, then communication reliability is improved, but interference to higher priority networks deteriorates

Engineering Contradiction:

Improvesignal qualityVSAvoidinterference to higher priority network

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the transmit power parameter dynamically based on interference conditions. Instead of using a fixed power level, the system adjusts power spectral density limits and transmission power according to measured interference from higher priority networks, allowing optimization of signal quality while preventing harmful interference.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies different power control strategies to different spatial locations and network conditions. Each UE adjusts its transmit power independently based on local interference measurements from neighboring networks, creating localized power optimization rather than uniform power control.

Inventive Principle:

Principle #3Local quality

3Measurement precision

If network devices continuously monitor and adjust power levels, then interference management precision is improved, but system complexity and processing overhead increase

Engineering Contradiction:

Improveinterference level measurementVSAvoidpower control system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent implements self-service interference management where UEs autonomously measure reference signals and determine their own interference levels without requiring centralized control. Each UE independently adjusts its power levels based on local measurements, reducing the complexity of network-side management while maintaining precise interference control.

Inventive Principle:

Principle #25Self-service

4Reliability

If power control configurations are implemented to protect higher priority networks, then quality of high-priority traffic is improved, but adaptability to varying network conditions deteriorates

Engineering Contradiction:

Improvequality of high-priority trafficVSAvoidadaptability to network conditions

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent implements dynamic power control that continuously adapts to changing network conditions. Power spectral density limits and transmission parameters are adjusted in real-time based on measured interference levels, allowing the system to maintain protection of higher priority networks while adapting to varying spectrum conditions and mobility patterns.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS11838229B2Enhanced ultra-reliable/low-latency communications over-the-air mechanism for shared spectrum

Publication Date: 2023.12.05 QUALCOMM INC

AI summary

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive, from a base station serving the UE in a first network, a power control configuration and a reference signal measurement configuration. The UE may receive, based at least in part on the reference signal measurement configuration, a reference signal from at least one wireless device of a second network. The UE may determine, based at least in part on the power control configuration and the received reference signal, an interference level for the second network introduced by the first network. The UE may adjust a transmission power limit for the UE based at least in part on the determined interference level and the power control configuration. The UE may transmit signals to the base station according to the adjusted transmission power limit.