Buffer Status Report Numerology Selection for Uplink Resource Efficiency
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Solution Overview
Problem
In wireless communication systems, particularly in the LTE and NR frameworks, the existing methods for transmitting buffer status reports (BSR) lead to duplicated reports when multiple numerologies are mapped to a logical channel, resulting in inefficient use of uplink resources as the network allocates resources based on redundant information.
Innovation Solution
A method where user equipment (UE) receives logical channel configuration information, selects a buffer size reporting numerology for each logical channel based on the shortest TTI length or widest OFDM subcarrier spacing, and calculates the buffer size excluding non-selected numerologies, thereby avoiding duplicated BSRs by only reporting the selected numerology's buffer size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple numerologies are mapped to a logical channel for flexible resource allocation, then adaptability is improved, but duplicate BSR transmissions occur causing resource waste
Solution Approach 1:
The patent segments the buffer size reporting by numerology type. Instead of reporting buffer status for all numerologies mapped to a logical channel, the UE divides the reporting into separate segments - one for the first numerology type and another for the second numerology type. This segmentation prevents duplicate reporting while maintaining the ability to track buffer status for each numerology independently, thus resolving the contradiction between flexible resource allocation and resource waste from duplicate reports.
2Measurement precision
If buffer size is reported for all mapped numerologies, then measurement precision is improved, but device complexity increases due to multiple reporting mechanisms
Solution Approach 1:
The patent extracts the buffer status information for different numerology types into separate reporting structures. Instead of including all numerology buffer statuses in a single complex report, the UE extracts and reports buffer status for the first numerology type in one BSR and for the second numerology type in another BSR. This extraction approach maintains measurement precision for each numerology while simplifying the reporting mechanism by avoiding the need to handle all numerologies in a single complex report structure.
Data Source
AI summary
The method for a user equipment (UE) transmitting a buffer status report (BSR) comprises receiving logical channel configuration information from a network, the logical channel configuration information including information related to a plurality of numerologies mapped to each logical channel; when the BSR is triggered, selecting a buffer size reporting numerology for each logical channel; calculating a buffer size for a numerology by including a buffer size of logical channels having the buffer size reporting numerology as the numerology; and reporting the BSR including information of the calculated buffer size.