RLC Status Report Segment Concatenation for Overhead Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, the overhead required for generating status reports can be large, leading to increased latency when the full status report format does not fit into a transport block, and the ability to send RLC status feedback is constrained, especially in NR TDD systems with mostly downlink-only slot patterns.
Innovation Solution
The solution involves concatenating non-adjacent NACKed segment information into a single NACK field to reduce overhead and decrease latency, allowing the receiver to request retransmission of entire portions of the SDU, even if some segments were successfully received, by determining conditions such as overhead savings and transport block size limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the full status report format is used to report all non-adjacent NACKed segments, then complete reception status information is provided, but the overhead increases and latency increases when the report does not fit into transport block
Solution Approach 1:
The patent segments the status report into multiple parts, with each part containing a subset of NACKed segment information. Instead of reporting all non-adjacent NACKed segments in a single large report, the receiver divides the report into smaller chunks that can fit into transport blocks, reducing latency while maintaining complete information coverage across multiple reports.
Solution Approach 2:
The patent applies partial action by reporting only a subset of NACKed segments in each status report rather than all segments. This allows the status report to fit into transport blocks with reduced overhead and latency, while ensuring complete coverage of all NACKed segments across multiple sequential status reports.
2Loss of information
If the full status report format is used to report all non-adjacent NACKed segments, then complete reception status information is provided, but the overhead increases
Solution Approach 1:
The status report is segmented into multiple smaller reports, each containing a subset of NACKed segment information. This segmentation reduces the overhead of each individual status report, allowing them to fit into transport blocks more efficiently, while the complete information is conveyed across the series of segmented reports.
Solution Approach 2:
Each status report contains only a partial set of NACKed segment information rather than the complete set. This partial action reduces the overhead of each status report, making them fit into transport blocks with less resource consumption, while ensuring all necessary information is transmitted across multiple reports.
3Measurement precision
If individual NACK fields are sent for each non-adjacent segment, then precise segment identification is achieved, but the status report size increases and may not fit into transport block
Solution Approach 1:
The patent merges multiple NACK fields into a single consolidated NACK field that contains information about multiple non-adjacent segments. This merging reduces the total status report size, allowing it to fit into transport blocks, while maintaining the ability to precisely identify individual segments through encoding schemes within the merged field.
Solution Approach 2:
The patent uses a compact encoding scheme in the merged NACK field that provides precise segment identification with fewer bits than individual NACK fields. This partial action approach achieves sufficient precision for segment identification while significantly reducing the overall status report size to fit within transport block constraints.
Data Source
AI summary
A method of operating a receiver in a communications network includes receiving a protocol data unit, PDU, from a transmitter, wherein the PDU carries at least part of a service data unit, SDU, determining that first and second non-adjacent segments of the SDU were not successfully received at the receiver, and requesting retransmission by the transmitter of a portion of the SDU from a beginning of the first non-adjacent segment to an end of the second non-adjacent segment.