User Apparatus Interference Reduction via Network Precoding
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Solution Overview
Problem
In LTE-Advanced systems, user apparatuses face challenges in achieving high interference reduction ability due to a shortage of necessary information for performing Interference Rejection Combining (IRC) Type 1 and Successive Interference Cancellation (SIC), leading to inferior interference reduction capabilities.
Innovation Solution
The system dynamically or semi-statically sends necessary information for IRC Type 1 channel estimation from the network side to the user apparatus, including precoding information, using physical layer control signals or RRC signaling, to enhance interference reduction capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the user apparatus performs IRC Type 1 and SIC without sufficient information from the network side, then the device complexity is reduced, but the interference reduction ability deteriorates
Solution Approach 1:
The network side performs preliminary actions by pre-calculating and transmitting precoding information, interference signal parameters, and channel state information to the user apparatus before the user apparatus needs to perform interference reduction. This allows the user apparatus to execute IRC Type 1 and SIC with sufficient information without increasing its own processing complexity.
Solution Approach 2:
The network side acts as an intermediary that bridges the gap between the interference base station and the user apparatus. It collects information from the interference base station, processes it, and delivers the necessary precoding and channel information to the user apparatus, enabling effective interference reduction without requiring direct complex interactions between the user apparatus and interference sources.
2Reliability
If the network side sends necessary information for IRC Type 1 using physical layer control signals or RRC signaling, then the interference reduction ability is improved, but the loss of information transmission resources increases
Solution Approach 1:
The precoding information and interference signal parameters transmitted by the network side serve multiple functions: they enable IRC Type 1 processing, support SIC operations, and provide channel state information for multiple users. This multi-functionality reduces the overall information overhead compared to transmitting separate dedicated signals for each purpose.
Solution Approach 2:
The network side dynamically adjusts the precision and granularity of precoding information based on channel conditions and interference levels. When interference is severe, more detailed information is transmitted; when conditions are favorable, compressed or approximate information suffices, thereby optimizing the trade-off between interference reduction performance and control signal overhead.
Data Source
AI summary
A user apparatus, in a radio communication system including a plurality of base stations, including a reception unit configured to receive, from a connecting base station, control information to be used for reducing an interference signal sent from an interference base station for the user apparatus; and an interference reducing unit configured to reduce the interference signal by using the control information to obtain a desired signal sent from the connecting base station.