Transport Block Size Determination Across RedCap UE Capabilities
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Solution Overview
Problem
Existing LTE and 5G NR access technology communication systems face inefficiencies in determining transport block sizes (TBS) for physical uplink and downlink shared channels due to limitations in parameter determination methods, particularly for reduced capability UEs like RedCap devices with varying requirements on data rate, latency, and battery life.
Innovation Solution
A method for determining transport block size (TBS) that involves modifying intermediate TBS based on transmission parameters, such as DCI formats, RNTIs, and UE capabilities, using specific steps and tables to ensure accurate TBS determination for both uplink and downlink channels, accommodating different UE categories and events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single TBS determination procedure is used for all UEs, then the procedure is simple and easy to implement, but it cannot accommodate diverse UE capabilities and requirements (e.g., RedCap devices with varying data rate, latency, and battery life requirements)
Solution Approach 1:
The patent segments the TBS determination procedure into multiple steps (first step, second step, third step, fourth step) with different calculation methods for different cases. It also segments UE categories into different types (e.g., RedCap UEs with capability indication versus regular UEs), allowing each segment to use the most appropriate determination method for its specific requirements.
Solution Approach 2:
The patent introduces dynamic adaptation mechanisms where the TBS determination procedure can switch between different calculation methods based on UE capability indications and transmission conditions. The system dynamically selects between simplified procedures for RedCap devices and full procedures for regular UEs, adapting to real-time requirements.
2Measurement precision
If detailed parameter determination is performed for accurate TBS calculation, then TBS accuracy is improved, but the processing time and computational complexity increase
Solution Approach 1:
The patent performs preliminary determination of key parameters (number of PRBs, modulation order, code rate) before final TBS calculation. By pre-determining these critical parameters based on UE capability and transmission conditions, the system avoids redundant calculations during the final TBS determination, reducing processing time while maintaining accuracy.
Solution Approach 2:
The patent applies different levels of calculation detail to different parts of the TBS determination process based on local requirements. For example, RedCap UEs with limited capabilities use simplified local calculation methods appropriate to their constraints, while full-capability UEs use comprehensive calculation methods where detailed parameter determination is performed.
3Adaptability or versatility
If multiple MCS tables are supported for different transmission modes, then adaptability to different transmission requirements is improved, but the complexity of selecting and managing appropriate tables increases
Solution Approach 1:
The patent implements self-service mechanisms where the UE autonomously selects the appropriate MCS table based on its capability indication and the transmission conditions. The UE itself determines which table (e.g., 64QAM table, 256QAM table, or RedCap-specific table) to use without requiring complex network-side table management, reducing overall system complexity while maintaining adaptability.
Solution Approach 2:
The patent creates a universal framework that accommodates multiple MCS tables through a common selection mechanism. The same UE capability indication and parameter determination procedure work across different table types, allowing the system to handle various transmission modes (64QAM, 256QAM, RedCap) through a unified multi-functional approach rather than separate specialized procedures.
Data Source
AI summary
A wireless communication method for use in a wireless terminal is disclosed. The wireless communication method comprises determining an intermediate transport block size (TBS) for a transport block transmitted between the wireless terminal and a wireless network node based on a plurality of transmission parameters, modifying the intermediate TBS to generate a modified TBS in response to at least one event, and determining a final TBS based on the modified TBS and a specific step in response to the at least one event, wherein the specific step is determined based on the plurality of transmission parameters.