Interference Replica Signal for Coordinated Cancellation
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Solution Overview
Problem
Existing CoMP schemes in mobile communication systems face inefficiencies in radio resource utilization and high device costs due to interference and antenna requirements.
Innovation Solution
A coordinated interference cancellation scheme where a base station generates an interference replica signal to cancel interference at the user terminal, improving Signal-to-Interference Ratio (SIR) and radio resource efficiency without needing multiple antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If JT-CoMP, DPS-CoMP, or CS-CoMP schemes are used to improve communication reliability, then interference is reduced, but radio resource use efficiency deteriorates because each point consumes radio resources for one user terminal
Solution Approach 1:
The patent creates a replica of the interference signal from the neighboring cell and transmits it from the serving cell. This copy of the interference signal allows the user terminal to cancel the actual interference through subtraction, achieving interference mitigation without requiring the neighboring cell to allocate resources exclusively for this user, thus maintaining radio resource efficiency while improving communication reliability
2Productivity
If CB-CoMP scheme is used to improve radio resource use efficiency, then resource consumption is reduced, but device cost deteriorates because each point needs to have a plurality of antennas
Solution Approach 1:
Instead of requiring multiple antennas at the base station for beamforming and null steering, the patent uses signal processing to create and transmit an interference replica. This approach achieves interference cancellation through software-based signal manipulation rather than hardware-based antenna arrays, reducing device complexity and cost while maintaining radio resource use efficiency
Solution Approach 2:
The patent replaces the mechanical/physical system of multiple antennas and beamforming hardware with a signal processing system that generates and transmits interference replicas. This substitution of physical hardware with software-based signal manipulation reduces device complexity while achieving the same interference mitigation goal
3Reliability
If interference cancellation is performed to improve SIR, then communication quality is enhanced, but system complexity deteriorates due to coordination between base stations
Solution Approach 1:
The patent uses dedicated signaling as an intermediary mechanism to transmit interference cancellation information from the serving cell to the user terminal. This standardized signaling approach provides a clear and efficient communication path for coordinating interference cancellation between base stations and user terminals, managing system complexity through established protocol interfaces
Data Source
AI summary
A mobile communication system comprises: a user terminal that receives a desired wave signal from a serving cell while receiving an interference wave signal from a neighboring cell adjacent to the serving cell; and a base station that manages the serving cell. The base station comprises: a controller that generates an interference replica signal corresponding to the interference wave signal and superposes the interference replica signal on the desired wave signal; and a transmitter that transmits the desired wave signal superposed with the interference replica signal to the user terminal The controller generates the interference replica signal such that the interference replica signal cancels the interference wave signal in a location of the user terminal. The interference replica signal acts as a disturbing signal, which disturbs demodulation of the desired wave signal, in a location other than the location of the user terminal.