Network MIMO Coordination for Cell-Edge Throughput
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Solution Overview
Problem
In MIMO communication systems, cell-edge mobile stations require high transmission power due to fluctuating channel conditions, and existing technologies struggle to efficiently manage communication with multiple base stations, leading to coverage and throughput limitations.
Innovation Solution
A mobile station equipped with multiple receive antennas and a control system that receives data from both a master and slave base station, enabling network MIMO communication by coordinating transmissions and retransmissions between multiple base stations, using space-time coding and precoding techniques to optimize signal reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a receiver is geographically located at the edge of a communication cell, then the receiver requires large transmission power, but this leads to coverage and throughput limitations
Solution Approach 1:
The patent combines multiple base stations into a network MIMO system where multiple transmitters work together to serve a single receiver. By merging the transmission capabilities of multiple base stations, the system achieves cooperative transmission that improves both coverage and throughput for cell-edge receivers without requiring excessive transmission power from any single base station.
Solution Approach 2:
The patent segments the transmission task across multiple base stations, dividing the overall communication function among several transmitters. Each base station transmits a portion of the data to the receiver, and the receiver combines these segments to reconstruct the complete information, thereby distributing the power requirement and improving system efficiency.
2Productivity
If network MIMO communication is implemented with multiple base stations, then coverage and throughput are improved, but system complexity increases
Solution Approach 1:
The patent creates a universal network MIMO framework that can be applied across different cellular network configurations. The system defines standardized procedures for multiple base stations to cooperate in serving receivers, making the solution broadly applicable and reducing the need for complex, custom-designed coordination mechanisms for each specific scenario.
Solution Approach 2:
The patent implements feedback mechanisms where receivers report channel state information and transmission status to multiple base stations. This feedback enables the base stations to adjust their transmissions dynamically, optimizing performance while maintaining manageable system complexity through standardized feedback loops rather than complex ad-hoc coordination.
3Reliability
If multiple transmitting antennas are used, then spatial diversity is provided, but channel conditions fluctuate significantly due to receiver movement
Solution Approach 1:
The patent merges the spatial diversity provided by multiple antennas at multiple base stations into a coordinated network MIMO system. By combining the signals from multiple transmitters with multiple antennas each, the system creates a more robust diversity effect that compensates for channel fluctuations caused by receiver movement, thereby improving reliability while maintaining stability.
Data Source
AI summary
A multiple-input, multiple-output (MIMO) communication system comprising a master base station and a slave base station. The master base station has a plurality of transmit antennas and transmits a first set of data to a mobile station in a first transmission. The slave base station has a plurality of transmit antennas and transmits a second set of data to the mobile station in the first transmission. The master base station retransmits the second set of data to the mobile station during a first retransmission and the slave base station retransmits the first set of data to the mobile station during the first retransmission.