Per-TTI Rank Control for Downlink CoMP
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Solution Overview
Problem
In wireless communication systems, especially in 5G networks, the existing methods for managing transmission opportunities (TxOP) in downlink coordinated multipoint (CoMP) operations face challenges in optimizing channel quality indicators (CQI) and rank adjustments across multiple transmission time intervals (TTIs, leading to suboptimal performance due to interference and inefficient resource allocation.
Innovation Solution
A method where a base station determines and updates the rank and data rate for each TTI within a TxOP by computing CQI back-offs using outer loop adaptation processes, allowing for per-TTI adjustments in rank and data rate to optimize transmission parameters and minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If rank and data rate are determined at the beginning of a transmission opportunity for the entire TxOP, then device complexity is reduced and ease of operation is improved, but transmission efficiency deteriorates and adaptability to changing channel conditions worsens
Solution Approach 1:
The patent divides the transmission opportunity (TxOP) into multiple transmission time intervals (TTIs) and applies separate rank and data rate determination for each TTI. This segmentation allows the system to adapt to changing channel conditions in each TTI while maintaining a simplified overall structure, resolving the contradiction between ease of operation and transmission efficiency.
Solution Approach 2:
The patent implements dynamic rank and data rate adjustment for each TTI within the TxOP based on real-time channel conditions and interference patterns. This dynamic approach enables the system to optimize transmission efficiency for each time interval while maintaining operational simplicity through automated per-TTI control, addressing the contradiction between static simplicity and dynamic efficiency.
2Productivity
If per-TTI rank and data rate updates are implemented, then transmission efficiency is improved and adaptability to changing conditions is enhanced, but device complexity and computational load increase
Solution Approach 1:
The patent performs preliminary determination of rank and data rate at the beginning of the TxOP, then applies CQI back-off adjustments for each subsequent TTI. This preliminary action reduces computational complexity by establishing baseline parameters upfront, while still enabling per-TTI optimization through simpler adjustment mechanisms, thus resolving the contradiction between complexity and efficiency.
Solution Approach 2:
The patent implements a feedback mechanism using CQI (Channel Quality Indicator) measurements and outer loop adaptation processes to update rank and data rate for each TTI. This feedback-based approach automates the complex per-TTI optimization, reducing manual intervention and device complexity while maintaining high transmission efficiency through continuous adaptation to channel conditions.
3Measurement precision
If CQI back-offs are computed for each TTI using outer loop adaptation processes, then measurement precision and transmission optimization are improved, but loss of time and processing overhead increase
Solution Approach 1:
The patent applies CQI back-off computation selectively for each TTI only when channel conditions warrant adjustment, rather than performing full recalculations for every TTI. This partial action approach maintains measurement precision where needed while reducing overall processing time and computational overhead, resolving the contradiction between precision and time loss.
Data Source
AI summary
A per-transmit time interval (TTI) rank control within a transmission opportunity (TxOP) is described for downlink coordinated multiple point (CoMP) operations. In operation, a base station may determine rank and data rate for communication during a transmission opportunity (TxOP) at the beginning of the TxOP. Each TxOP may include a plurality of transmission time intervals (TTIs). For each TTI of the TxOP, the base station computes one or more channel quality indicator (CQI) back-offs using one or more outer loop adaptation processes per TTI, and updates rank and the data rate using the CQI back-offs. Once updated, the base station transmits the downlink data during each TTI according to the updated rank and the data rate.