TBS Determination for Multi-TRP FDM Schemes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing methods for determining Transport Block Size (TBS) in New Radio (NR) Rel-15 are inadequate for Frequency Domain Multiplexing (FDM) schemes with single codeword-single Redundancy Version (RV) and multiple codewords-multiple RVs, as they cannot directly apply the Frequency Domain Resource Allocation field in Downlink Control Information (DCI) for these schemes.
Innovation Solution
The proposed solution involves receiving an indication of the type of FDM scheme from the base station and applying different rules to determine TBS, specifically using Rel-15 TBS determination for single codeword-single RV FDM schemes and only the PRBs corresponding to the first codeword with the first RV for multiple codeword-multiple RV FDM schemes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing TBS determination methods from NR Rel-15 are applied to FDM schemes, then the method is simple and straightforward, but it cannot accurately determine TBS for single codeword-single RV and multiple codewords-multiple RVs FDM schemes
Solution Approach 1:
The patent segments the FDM scheme into two distinct types (single codeword-single RV and multiple codewords-multiple RVs) and applies different TBS determination rules for each type. This segmentation allows accurate TBS determination for each specific FDM scheme while maintaining clarity in the determination process.
Solution Approach 2:
The patent introduces dynamic adaptability by selecting different TBS determination methods based on the indicated FDM scheme type. The system dynamically adjusts the determination rule according to the specific FDM configuration, enabling accurate TBS calculation across different transmission scenarios without using a fixed complex method for all cases.
2Reliability
If different rules are applied for different FDM schemes, then TBS determination accuracy is improved, but the complexity of the determination process increases
Solution Approach 1:
The base station performs preliminary action by indicating the FDM scheme type to the UE before TBS determination is needed. This advance indication allows the UE to select the appropriate TBS determination rule without complex real-time analysis, improving reliability while keeping the processing complexity manageable through pre-defined rules.
Solution Approach 2:
The patent changes the parameter of TBS determination rules based on the FDM scheme type parameter. By linking the determination rule selection to the indicated FDM scheme, the system achieves reliable TBS determination for different transmission modes while maintaining a systematic approach that limits complexity growth.
Data Source
AI summary
Systems and methods for determining Transport Block Size (TBS) are provided. In some embodiments, a method performed by a wireless device for determining (TBS) includes: receiving an indication of the type of Frequency Domain Multiplexing (FDM) scheme from a base station; and applying different rules to determine TBS depending on which type of FDM scheme was indicated. In this way, different rules of how to determine TBS are provided when both flavors (i.e., single codeword-single Redundancy Version (RV) scheme, and multiple codewords-multiple RVs scheme) of FDM schemes are supported by NR Rel-16.