UE Signal Detection via Autonomous Interference Power Estimation
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Solution Overview
Problem
In OFDMA systems like 3GPP LTE, user equipment (UE) faces challenges in signal detection due to interference from dominant interference cells, as it lacks the necessary power offset information to effectively handle inter-cell interference, leading to performance degradation at the cell edge.
Innovation Solution
The UE estimates and acquires power offset information of the dominant inter-cell interference signal independently, using a control unit to process this information for improved signal detection, enabling joint detection and interference cancellation without relying on the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the base station provides power ratio information to the UE, then the UE can correctly demodulate data signals using channel estimation from pilot signals, but the UE still experiences performance degradation at cell edge due to dominant inter-cell interference
Solution Approach 1:
The UE performs preliminary estimation of dominant interference cell power offset information before signal detection. By acquiring this information in advance through autonomous estimation (without base station signaling), the UE prepares interference cancellation parameters that enable reliable signal detection at cell edge locations
Solution Approach 2:
The UE converts the harmful dominant inter-cell interference into a beneficial signal by estimating the interference cell's power offset information and using it for interference cancellation. The previously harmful interference signal becomes a known quantity that can be subtracted from the received signal, improving detection performance
2Reliability
If the UE autonomously estimates dominant interference cell power offset information, then signal detection performance is improved by enabling interference cancellation, but the device complexity increases
Solution Approach 1:
The UE performs self-service by autonomously estimating the dominant interference cell power offset information without requiring additional signaling from the base station. The UE uses its own received signals and internal processing capabilities to acquire the necessary interference cancellation parameters, reducing network overhead while improving performance
Data Source
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AI summary
A method and an apparatus for detecting signals in a cellular system are provided. The method includes estimating power of a dominant interference cell and detecting a signal by reducing a detection performance degradation caused by an interference signal of the dominant interference cell. The dominant interference cell includes a cell, other than a serving cell, causing an interference.