PUSCH Rank Information Placement via Bottom-Up OFDM Selection
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Solution Overview
Problem
Current systems for reporting rank information (RI) on a physical uplink shared channel (PUSCH) face limitations in efficiently integrating RI with data resources, as existing methods often require RI to be reported alongside control information in the same subframe, leading to resource constraints.
Innovation Solution
The solution involves a base station selecting two or more orthogonal frequency-division multiplexing (OFDM) symbols from the bottom of the PUSCH and replacing data resources with rank information (RI) resources, ensuring RI is punctured starting from the bottom of the channel, allowing for efficient reporting of RI in data resources while maintaining separation from reference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If RI is reported alongside control information in the same subframe, then control information can be transmitted efficiently, but resource constraints are imposed and flexibility is reduced
Solution Approach 1:
The patent segments the PUSCH resources by separating RI reporting from control information transmission. RI is reported in dedicated resources starting from the bottom OFDM symbol, while control information is transmitted in separate resources. This segmentation allows independent optimization of each function and provides flexibility in resource allocation without being constrained by fixed subframe requirements.
Solution Approach 2:
The patent introduces a new dimension for RI reporting by utilizing the OFDM symbol domain vertically (from bottom to top) rather than confining RI to the same subframe as control information. This dimensional separation allows RI to be reported at different times and in different resources, enhancing flexibility while maintaining transmission efficiency.
2Productivity
If RI resources are punctured into data resources, then RI can be reported in data resources improving utilization, but separation from reference signals must be maintained
Solution Approach 1:
The patent applies local quality by ensuring that RI resources have specific local characteristics - they are positioned in the bottom OFDM symbols and are separated from reference signals by at least one symbol. This localized positioning ensures optimal performance for RI transmission while maintaining overall system efficiency. The separation requirement creates a specific quality attribute for RI resources that differs from other data resources.
3Reliability
If RI is repeated in multiple OFDM symbols, then reliability of RI transmission is improved, but the number of symbols occupied increases
Solution Approach 1:
The patent applies partial action by repeating RI in only the necessary number of OFDM symbols (two or more) rather than using all available symbols. The repetition is performed in the bottom OFDM symbols starting from the bottom, which provides sufficient reliability through diversity while minimizing the total symbol occupancy. This partial repetition strategy balances reliability improvement with efficient resource utilization.
Data Source
AI summary
A wireless communication network comprising a plurality of base stations capable of wireless communication with a plurality of subscriber stations within a coverage area of the network, wherein at least one of the plurality of base stations is capable of selecting two or more orthogonal frequency-division multiplexing (OFDM) symbols in a subframe of a physical uplink shared channel, the two or more OFDM symbols are selected starting from the bottom of the physical uplink shared channel in a bottom-up manner, and repeating one or more rank information (RI) coded bits in each of the selected two or more OFDM symbols.