MIMO Transport Format Selection via Partial Channel State Construction
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Solution Overview
Problem
Current MIMO channel technologies face limitations in determining an optimal transport format due to partial channel state knowledge, leading to potential failures in rank adaptation and link adaptation, especially when the number of transmit antenna elements is less than the number of receive antenna elements, resulting in reduced channel estimation and coverage.
Innovation Solution
A method is introduced to select a transport format for a MIMO channel by performing channel estimation based on reference signals from a subset of antenna ports, constructing extended channel states, and evaluating a metric to switch between different channel states, allowing for higher or lower ranks, thereby compensating for channel quality overestimation and improving data transmission reliability and throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If channel estimation is performed based on reference signals from all antenna ports, then channel state knowledge is complete, but signaling overhead and measurement complexity increase
Solution Approach 1:
The patent segments the channel estimation process by dividing antenna ports into two groups: those covered by reference signals (with measured channel states) and those without reference signals (with constructed channel states). This segmentation allows the system to perform measurements only on necessary antenna ports while constructing states for others, reducing measurement complexity while maintaining complete channel state knowledge.
Solution Approach 2:
The patent introduces channel construction as an intermediary process that generates channel state information for antenna ports lacking reference signals. By using the measured channel states from other ports as intermediaries and applying channel construction algorithms, the system derives the channel states for all antenna ports without directly measuring them, thus reducing measurement overhead.
2Device complexity
If the number of transmit antenna elements is reduced, then device complexity decreases, but channel estimation accuracy and coverage deteriorate
Solution Approach 1:
The patent uses channel construction to create copies or estimates of channel states for antenna ports without direct reference signals. By copying channel characteristics from measured ports and adapting them through construction algorithms, the system recovers the channel state information that would otherwise be lost due to reduced transmit antenna elements, maintaining estimation accuracy with lower complexity.
3Adaptability or versatility
If transport format selection is based on constructed channel states, then adaptability improves, but reliability decreases due to potential overestimation
Solution Approach 1:
The patent implements a feedback mechanism where the selected transport format is monitored for actual performance. If the constructed channel state leads to transport format selection that performs poorly (indicating overestimation), the system receives feedback and adjusts future transport format selections accordingly, balancing adaptability with reliability through learned experience.
Solution Approach 2:
The patent allows dynamic adjustment of channel construction parameters and transport format selection criteria based on channel conditions and performance feedback. By changing parameters such as construction algorithm selection, confidence thresholds, and transport format margins, the system optimizes the balance between adaptability and reliability under different operating conditions.
Data Source
AI summary
A technique for selecting a transport format for a multiple-input multiple-output, MIMO, channel between a first station and a second station is described. The first station comprises M first antenna ports, wherein M≥2. The second station comprises N second antenna ports, wherein N≥2. As to a method aspect of the technique, a channel estimation is performed based on reference signals received at the M first antenna ports from a subset comprising X0 second antenna ports among the N second antenna ports, wherein 1≤X0<N≤M. The channel estimation results in a partial channel state relating to the X0 second antenna ports to the M first antenna ports. At least one extended channel state is constructed based on the partial channel state.