UE Interference Measurement Feedback for Backoff Adaptation
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing power amplifier non-linear distortions, which cause in-band and out-of-band interference, particularly in 5G NR networks, due to power backoff adaptations in neighboring cells without clear identification of interference sources.
Innovation Solution
UEs and network entities perform interference measurements before and after power backoff adaptations, sending reports to confirm interference origins, allowing networks to adjust power backoff settings and reduce signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If power backoff adaptation is applied to reduce PA non-linear distortions, then power efficiency is improved, but inter-cell interference increases
Solution Approach 1:
The patent implements a feedback mechanism where UEs measure downlink interference from neighboring cells and report these measurements to the serving base station. The serving base station then communicates with the neighboring base station to provide feedback about the interference level. This feedback loop enables the neighboring base station to adjust its power backoff adaptation settings to optimize the trade-off between power efficiency and interference generation.
Solution Approach 2:
The patent introduces an intermediary signaling mechanism involving multiple network entities (serving base station, neighboring base station, and UE) that mediates the interference management process. The serving base station acts as an intermediary to relay interference information and control decisions between the UE and the neighboring base station, enabling coordinated interference management without direct interference between the conflicting parties.
2Measurement precision
If interference measurements and reporting are performed to identify interference sources, then interference management accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent implements partial measurement and reporting by having UEs measure interference only from specific neighboring cells that are configured as potential interference sources. The measurement and reporting are performed selectively based on network configuration and actual interference conditions, rather than continuously for all possible sources. This reduces signaling overhead while maintaining sufficient accuracy for interference management.
3Reliability
If continuous interference monitoring is performed to track backoff adaptation impact, then interference management reliability is improved, but processing resources are consumed
Solution Approach 1:
The patent implements periodic interference monitoring where UEs perform interference measurements at specific intervals rather than continuously. The measurement periodicity is configured by the network based on the dynamics of the wireless environment and the importance of interference management for the particular service. This periodic approach maintains reliability for interference management while significantly reducing processing resource consumption compared to continuous monitoring.
Data Source
AI summary
Aspects are provided that allow a user equipment (UE) to facilitate interference measurements configuration for assessing impact of network entity backoff adaptation relaxation. The UE may obtain interference measurements of one or more first reference signals including a measurement prior to and after a backoff adaptation associated with a first network entity, and signal strength measurements of a second reference signal received from the first network entity. The UE also may send, to a second network entity of a serving cell, an interference report indicating whether downlink interference originates from the first network entity based at least in part on the interference measurements and the signal strength measurements. After obtaining the report, the second network entity may send, to the first network entity, a feedback signal indicating whether the first network entity is to modify the backoff adaptation based on the downlink interference to the UE.