Transport Block Size Computation for Shortened Transmission Time Interval Channels
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Solution Overview
Problem
Existing wireless communication systems face challenges in determining optimal transport block sizes for shortened transmission time intervals (sTTI) channels, as they have fewer resources compared to legacy TTI channels, leading to inefficiencies in resource utilization and potential coding rate issues.
Innovation Solution
The solution involves using baseline and translation tables to determine an initial transport block size for sTTI channels, scaling it based on the available resources, and selecting the appropriate table to ensure efficient resource allocation, which includes rounding the scaled size to a valid TBS value, thereby maintaining proportional reduction and avoiding excessive coding rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If sTTI channels use shorter transmission time interval, then latency is reduced, but available resources decrease leading to smaller transport block size
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the transport block size based on the number of available resource blocks and the specific TBS table selected. The formula TBS = f(N_PRB, TBS table) allows the system to adapt the block size to the reduced resources in sTTI channels while maintaining efficient resource utilization and appropriate coding rates.
2Productivity
If transport block size is reduced for sTTI channels, then resource utilization efficiency improves, but coding rate may become excessive
Solution Approach 1:
The patent incorporates feedback mechanisms through the selection of different TBS tables (first TBS table, second TBS table, or combined TBS table) based on the number of resource blocks. This feedback-driven table selection ensures that the transport block size is appropriately scaled to maintain coding rates within reliable ranges while maximizing resource utilization efficiency.
3Productivity
If TBS is scaled proportionally to resource reduction, then resource allocation efficiency improves, but computational complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-defining multiple TBS tables with predetermined entries that map resource block counts to appropriate transport block sizes. These tables are prepared in advance and selected based on the number of resource blocks, eliminating the need for complex real-time calculations and reducing computational complexity while maintaining efficient resource allocation.
Data Source
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AI summary
Systems, apparatuses, and methods for computing transport block size (TBS) for channels with shortened transmission time interval (sTTI). An initial size may be determined based on one or more TBS tables. The initial size may be scaled by a factor associated with an sTTI channel. A TBS table is selected based on the one or more TBS tables. The scaled size may be rounded based on the selected TBS table to generate a TBS for the sTTI channel.