Bandwidth Part Restriction Bit Map Overhead Reduction
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Solution Overview
Problem
In next-generation wireless communication systems, such as 5G, the overhead in higher layer signaling is significant due to the need to repeat restriction bit maps for each bandwidth part, leading to inefficient resource management and increased signaling complexity.
Innovation Solution
Encoding a confirmation bit in each bandwidth part to indicate that the user equipment can use the restriction bit map from the primary bandwidth part, thereby reducing the need to transmit the same bit maps for secondary bandwidth parts, thus minimizing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If restriction bit maps are repeated for each bandwidth part, then configuration accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent applies the copying principle by creating a simplified copy (confirmation bit) that references the original restriction bit map configuration. Instead of transmitting full bit maps for each bandwidth part, the system transmits a confirmation bit that copies the reference to the primary bandwidth part's restriction bit map, thereby reducing signaling overhead while maintaining configuration accuracy.
Solution Approach 2:
The patent implements universality by making the primary bandwidth part's restriction bit map configuration universally applicable to multiple bandwidth parts. A single restriction bit map configuration serves multiple purposes across different bandwidth parts, and the confirmation bit mechanism enables this universal application while reducing the need for redundant signaling.
2Loss of information
If restriction bit maps are transmitted for each bandwidth part, then configuration completeness is improved, but signaling complexity increases
Solution Approach 1:
The patent extracts the essential configuration information from the full restriction bit maps and separates it into two parts: the primary configuration (transmitted once) and the confirmation indicators (transmitted for each bandwidth part). This extraction removes redundant information while preserving configuration completeness, thereby reducing signaling complexity.
Solution Approach 2:
The patent segments the restriction bit map configuration into a primary component (applied to the first bandwidth part) and secondary components (indicated by confirmation bits for other bandwidth parts). This segmentation allows the system to maintain complete configuration information while reducing the overall signaling complexity by avoiding repetition of the entire bit map for each bandwidth part.
Data Source
AI summary
Various embodiments disclosed herein provide for reduced overhead signaling when a user equipment device is being configured with multiple bandwidth parts for downlink transmission. When a user equipment device is being configured with multiple bandwidth parts (channels on an aggregate carrier), the signaling that indicates the codebook subset restriction bit map, rank restriction bit map, and beam restriction bit map needs to be repeated for each bandwidth part. Often however, the restriction bit maps are repeated in the bandwidth parts, and so overhead can be reduced by encoding a confirmation bit in each bandwidth part, such that if the confirmation bit is set to “1”, the user equipment device can know to apply the restriction bit map from the primary bandwidth part to the secondary bandwidth part, without having to encode the secondary bandwidth part restriction bit map.