Multi-cell Cooperative Communication System for Interference Management
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Solution Overview
Problem
In conventional cellular communication, terminals located at cell boundaries experience reduced data transmission rates due to interference from neighbor cell base stations, limiting the increase in data transmission rates.
Innovation Solution
A multi-cell cooperative communication system where multiple base stations, each with at least one antenna, cooperate to perform multi-antenna communication with a terminal by using a shared code book for precoding data signals and sharing radio resources, allowing for improved channel estimation and feedback mechanisms to optimize data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional cellular communication is used, then system simplicity is maintained, but data transmission rate is limited due to interference from neighbor cell base stations
Solution Approach 1:
Multiple base stations (serving cell and neighbor cells) are merged into a cooperative communication system where they jointly transmit data signals to the terminal using a shared code book and radio resources, transforming independent transmissions into a coordinated MIMO system that improves data transmission rate while managing interference
Solution Approach 2:
The code book is made universal and shared among all participating base stations, enabling them to perform precoding operations consistently. This universal code book approach allows multiple base stations to cooperate effectively while maintaining system simplicity in the precoding mechanism
2Productivity
If multiple base stations cooperate for multi-antenna communication, then data transmission rate is improved, but system complexity increases
Solution Approach 1:
A single universal code book is shared among all base stations, which simplifies the system by eliminating the need for each base station to maintain its own separate code book. This universality reduces operational complexity while enabling multi-antenna communication across multiple base stations
Solution Approach 2:
The system changes the parameter of code book sharing from individual base station-specific to network-wide universal, which fundamentally simplifies the coordination mechanism and reduces system complexity while maintaining the benefits of multi-base station cooperation
3Productivity
If neighbor cell base stations transmit data signals, then data transmission rate can be improved through cooperation, but interference to serving cell terminal increases
Solution Approach 1:
The patent converts the previously harmful interference signals from neighbor cells into beneficial cooperative transmission signals. By having neighbor cells transmit data signals as part of the cooperative MIMO system, the interference is transformed into useful signal diversity that improves overall data transmission rate
Solution Approach 2:
The system merges the transmissions from serving cell and neighbor cells into a unified cooperative communication framework, where both types of transmissions are treated as beneficial signals rather than interfering with each other, thereby eliminating the harmful effect of neighbor cell interference
Data Source
AI summary
Disclosed is a data transmission system that transmits data by using relay. The relay may select a transmission terminal from among a plurality of terminals accessing a base station. The base station may transmit base station data to the relay during a first time slot, the transmission terminal may transmit terminal data to the relay. The relay may transmit the terminal data to the base station and may transmit the base station data to the transmission terminal during a second time slot.