Interference Replica Signal Generation for Mobile Communication Systems
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Solution Overview
Problem
Existing CoMP schemes in mobile communication systems face issues such as reduced radio resource efficiency and high device and installation costs due to the need for multiple antennas, particularly in JT-CoMP, DPS-CoMP, and CS-CoMP, while CB-CoMP struggles with maintaining resource efficiency and cost effectiveness.
Innovation Solution
A mobile communication system that generates an interference replica signal to cancel interference waves received by user terminals, allowing for improved Signal-to-Interference Ratio (SIR) without requiring multiple antennas at base stations, thus enhancing radio resource efficiency and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If JT-CoMP, DPS-CoMP, or CS-CoMP schemes are used, then coordination between multiple base stations is achieved, but radio resource use efficiency is reduced because each point consumes radio resources for one user terminal
Solution Approach 1:
The serving base station creates a replica of the interference signal from the interfering base station and transmits it as an interference replica signal. This copying approach allows the interfering signal to be reproduced and canceled without requiring the interfering base station to allocate dedicated resources for coordination, thereby maintaining radio resource efficiency while achieving interference cancellation.
2Productivity
If CB-CoMP scheme is used, then radio resource use efficiency is maintained, but device cost and installation cost increase because each point needs to have a plurality of antennas
Solution Approach 1:
The invention extracts only the necessary interference cancellation function from the complex multi-antenna beamforming system. Instead of requiring multiple antennas for beamforming and null steering, the system extracts the interference signal characteristics and creates a simplified replica transmission approach that achieves interference cancellation with a single antenna configuration, thereby reducing device and installation costs.
3Reliability
If interference cancellation is implemented, then Signal-to-Interference Ratio (SIR) is improved, but system complexity increases due to interference replica signal generation and superposition
Solution Approach 1:
The interference replica signal is generated by copying the structure and characteristics of the actual interference signal. The serving base station obtains interference signal information (such as resource allocation, modulation scheme, and coding rate) from the interfering base station or through measurement, then creates a simplified replica that can be superposed on the desired signal. This copying approach maintains SIR improvement while keeping the processing complexity manageable through standardized signal replication procedures.
Data Source
AI summary
A mobile communication system comprises: a user terminal that receives a desired wave signal from a serving cell and an interference wave signal that is a signal to another user terminal; and a first base station that manages the serving cell. The first base station includes: a control unit configured to generate configured to an interference replica signal corresponding to the interference wave signal and to superpose the interference replica signal on the desired wave signal; and a transmission unit configured to transmit the desired wave signal superposed with the interference replica signal to the user terminal. The control unit generates the interference replica signal such that the interference replica signal received by the user terminal cancels the interference wave signal received by the user terminal.