CIR Group Feedback in UWB Communication to Cut Indication Overhead
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Solution Overview
Problem
Current UWB communication systems face high indication overheads in channel impulse response (CIR) tap feedback mechanisms due to the need to indicate each tap individually, which is inefficient.
Innovation Solution
Implement a method where CIR taps are grouped and indicated as a whole, reducing overheads by using first indication information to specify CIR groups within a CIR window, allowing for flexible grouping settings and reduced signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If each CIR tap is indicated individually in the feedback mechanism, then the sensing result can be accurately fed back, but the indication overheads become high
Solution Approach 1:
The patent divides the CIR window into multiple CIR groups, where each group contains multiple CIR taps. Instead of indicating each tap individually, the system indicates groups of taps collectively. This segmentation approach reduces the number of indication signals required while maintaining the ability to accurately identify which taps need feedback, thereby resolving the contradiction between measurement precision and indication overheads.
Solution Approach 2:
The patent merges multiple CIR taps into CIR groups for collective indication. By combining multiple taps into a single group unit, the system reduces the total number of indication signals needed. The first indication information indicates multiple CIR groups, and the second indication information indicates specific CIR taps within those groups, achieving efficient compression of indication overheads while preserving sensing accuracy.
2Reliability
If all CIR taps in the CIR window are fed back, then complete sensing information is provided, but the feedback overhead increases
Solution Approach 1:
The patent extracts only the necessary CIR information for feedback by using a two-stage indication mechanism. The first indication information identifies relevant CIR groups, and the second indication information specifies the exact CIR taps within those groups that need feedback. This extraction approach ensures that only essential sensing information is transmitted, maintaining reliability while reducing feedback overhead significantly.
Solution Approach 2:
Instead of feedback all CIR taps unconditionally, the system applies partial action by selectively indicating only the necessary CIR groups and taps based on the indication information. This partial feedback approach provides sufficient sensing information for the intended application while avoiding the excessive overhead of complete CIR window feedback.
3Adaptability or versatility
If the indication mechanism covers the entire CIR window, then all possible sensing results can be indicated, but the complexity of the indication system increases
Solution Approach 1:
The patent segments the CIR window into multiple CIR groups, creating a hierarchical indication structure. This segmentation allows the system to cover the entire CIR window while managing complexity through organized grouping. The first indication information operates at the group level and the second indication information operates at the tap level within groups, making the overall system more manageable and less complex than indicating every tap individually across the entire window.
Solution Approach 2:
The patent introduces a two-dimensional indication structure: the first dimension (first indication information) indicates CIR groups at a coarser granularity, and the second dimension (second indication information) indicates specific taps within those groups at a finer granularity. This dimensional approach allows comprehensive coverage of the CIR window while reducing overall system complexity through hierarchical organization of the indication process.
Data Source
AI summary
A communication method includes: receiving first indication information, and sending first channel impulse response (CIR) information based on the first indication information. The first indication information indicates one or more CIR groups that need to be fed back in a CIR window, and each CIR group that needs to be fed back includes an (I)th CIR tap and a (II)th CIR tap that are in the CIR window, and all CIR taps between the (I)th CIR tap and the (II)th CIR tap. The first CIR information is the one or more CIR groups that are indicated by the first indication information and that need to be fed back.