Cooperative MIMO Feedback Path Selection for Delay Reduction
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Solution Overview
Problem
In cooperative MIMO mobile communication systems, data transmission delays and feedback control command performance are hindered by inter-cell interference and channel changes, particularly in closed-loop precoding schemes where large amounts of feedback information are cumbersome.
Innovation Solution
A method is introduced to selectively transmit precoding-related feedback control information through optimized paths, including direct paths or relay stations, based on delay sensitivity and availability of feedback channels, allowing for improved channel management and reduced interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If closed-loop precoding schemes are used in cooperative MIMO systems, then MIMO efficiency is improved through feedback information, but data transmission delays increase due to large amounts of feedback information
Solution Approach 1:
The patent extracts only the essential precoding-related feedback control information from the complete feedback information set. Instead of transmitting all feedback information, the system selectively transmits only the precoding matrix indicator (PMI) and rank indicator (RI) that are critical for precoding operations, thereby reducing feedback overhead and transmission delay while maintaining MIMO efficiency.
Solution Approach 2:
The patent segments feedback information transmission into different paths based on delay sensitivity. Urgent precoding-related feedback is transmitted through direct paths or priority channels, while less time-sensitive feedback can use relayed paths. This segmentation allows critical control information to reach the transmitter quickly without being bottlenecked by general feedback traffic.
2Adaptability or versatility
If feedback information is transmitted through relay stations, then system flexibility is improved, but transmission delays increase
Solution Approach 1:
The patent implements dynamic path selection where the feedback transmission route is adaptively chosen based on real-time system conditions. When direct transmission is available and urgent, the system uses direct paths; when relayed transmission is necessary for coverage or load balancing, relay paths are used. This dynamic approach optimizes the trade-off between flexibility and delay based on current operational needs.
Solution Approach 2:
The patent introduces relay stations as optional intermediaries for feedback transmission. These relays provide flexibility for users in coverage areas where direct transmission to the serving base station is not feasible. The system can dynamically activate or deactivate relay usage based on channel conditions, user location, and traffic requirements, making the feedback mechanism adaptable to diverse deployment scenarios.
3Measurement precision
If all feedback information is transmitted to all cooperative base stations, then coordination accuracy is improved, but feedback overhead and processing complexity increase
Solution Approach 1:
The patent applies local quality by providing different feedback information to different cooperative base stations based on their specific roles and channel conditions. Each base station receives the precoding-related feedback that is most relevant to its function in the cooperative MIMO system, rather than all base stations receiving identical complete feedback sets. This reduces overall feedback overhead while maintaining the coordination accuracy needed for effective cooperative transmission.
Data Source
AI summary
A method for transmitting and receiving data in a cooperative Multiple-Input Multiple-Output (MIMO) mobile communication system is disclosed. The method includes selecting a transmission path for transmitting precoding-related feedback control information to one or more cooperative base stations operating in the cooperative MIMO mode, and transmitting the precoding-related feedback control information to the one or more cooperative base stations through the selected transmission path.