Full-Duplex Beam Switching for Self-Interference Minimization
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Solution Overview
Problem
In full-duplex radio communication systems, there is a challenge in determining optimal transmission beams that balance self-interference and cross-link interference, which affects the performance of user equipment (UE) in wireless communication systems.
Innovation Solution
A method where a user equipment (UE) receives information about beam switching from a base station, generates transmission beam patterns, transmits a reference signal, measures self-interference, and communicates this information back to the base station, which then determines and provides optimal beam patterns considering both self-interference and cross-link interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If beam switching is implemented to reduce self-interference, then self-interference is minimized, but cross-link interference to other UEs increases
Solution Approach 1:
The patent implements a feedback mechanism where the UE measures self-interference using reference signals, reports the measured self-interference information to the BS, and the BS determines optimal beam patterns based on this feedback. This closed-loop feedback system enables dynamic adjustment of beam patterns to minimize self-interference while considering cross-link interference to other UEs.
Solution Approach 2:
The patent changes beam pattern parameters dynamically by generating multiple transmission beam patterns, measuring self-interference for each pattern, and selecting the optimal beam pattern based on measured self-interference levels. The BS adjusts beam pattern parameters considering both self-interference minimization and cross-link interference protection for other UEs.
2Object-generated harmful factors
If beam patterns are optimized for self-interference cancellation, then self-interference is reduced, but system complexity increases
Solution Approach 1:
The patent performs preliminary actions by pre-generating multiple transmission beam patterns before actual data transmission. The UE prepares beam patterns in advance, measures self-interference using reference signals, and reports measurements to the BS, which determines optimal beam patterns before data transmission begins. This preliminary preparation simplifies the real-time transmission process.
Solution Approach 2:
The UE performs self-measurement of self-interference using transmitted reference signals and generates self-interference information autonomously. The UE services itself by measuring, evaluating, and reporting its own self-interference characteristics to the BS, reducing the need for complex external measurement and control infrastructure.
3Reliability
If multiple beam patterns are generated and measured, then optimal beam selection improves performance, but measurement and processing time increases
Solution Approach 1:
The patent applies partial action by generating and measuring a limited number of candidate beam patterns rather than exhaustively evaluating all possible beam patterns. The UE generates at least one transmission beam pattern (typically a limited set of candidates), measures self-interference for these candidates, and selects the optimal one, achieving good performance without exhaustive measurement.
Solution Approach 2:
The patent implements periodic beam pattern measurement and updating, where the UE periodically measures self-interference using reference signals and reports to the BS. The BS periodically determines optimal beam patterns based on changing channel conditions and self-interference characteristics, balancing measurement overhead with the need for accurate beam selection.
Data Source
AI summary
A method of transmitting and receiving a signal by a user equipment (UE) in a wireless communication system is disclosure. The method includes receiving information related to beam switching from a base station (BS), generating at least one transmission beam pattern based on the information related to the beam switching, transmitting a reference signal by using the at least one transmission beam pattern, measuring a self-interference signal based on the reference signal, transmitting information about the measured self-interference signal to the BS, and receiving beam pattern information based on the measured self-interference signal from the BS. The beam pattern information indicates a beam pattern determined by the BS, and the information related to the beam switching includes information about one of whether beam switching is requested, a beam switching interval, and the number of beam switching candidates.