PUSCH Transport Block Sizing with OCC-Based Scaling
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Solution Overview
Problem
There is a need for improved methods to determine transport block sizes in uplink transmissions for wireless communication systems, particularly in 5G NR, to enhance data rate, latency, and reliability, especially for diverse use cases like eMBB, mMTC, and URLLC.
Innovation Solution
A user equipment (UE) is equipped with computer-executable instructions to determine the transport block size for a Physical Uplink Shared Channel (PUSCH) transmission by considering factors such as the application of Orthogonal Cover Code (OCC), spreading factor, and modulation-and-coding-scheme (MCS), using a scaling factor based on these conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed transport block size determination method is used, then the method is simple to implement, but it cannot optimize for different use cases (eMBB, mMTC, URLLC) and achieves poor data rate and reliability performance
Solution Approach 1:
The patent implements dynamic transport block size determination by introducing a scaling factor that adapts the TBS based on the actual number of allocated resource elements. The method dynamically adjusts the TBS according to real-time channel conditions and resource allocation, transitioning from a fixed determination method to a dynamic one that optimizes performance for different use cases including eMBB, mMTC, and URLLC.
Solution Approach 2:
The patent changes the parameter of transport block size by introducing a scaling factor that modifies the determined TBS based on the ratio of actual to expected resource elements. This parameter change allows the system to adapt the TBS to different channel conditions and resource allocation scenarios, improving data rate and reliability while maintaining implementation simplicity through a straightforward scaling operation.
2Productivity
If the transport block size is increased to improve data rate, then data transmission speed improves, but transmission reliability decreases due to higher error rates
Solution Approach 1:
The patent optimizes the balance between data rate and reliability by dynamically adjusting the transport block size parameter based on the scaling factor. The scaling factor, which is determined by the ratio of actual to expected resource elements, allows the system to increase TBS when channel conditions are good (improving data rate) while decreasing TBS when channel conditions deteriorate (maintaining reliability), thus achieving adaptive optimization of both parameters.
3Reliability
If the transport block size is decreased to improve reliability, then transmission reliability improves, but data transmission efficiency decreases
Solution Approach 1:
The patent prevents the system from unnecessarily decreasing the transport block size by introducing a scaling mechanism that maintains TBS at optimal levels. The scaling factor ensures that even when resource elements are reduced, the TBS is adjusted proportionally to maintain efficient data transmission, avoiding excessive TBS reduction that would harm productivity while still improving reliability when needed.
4Reliability
If OCC is applied to PUSCH transmission to improve reliability, then transmission reliability improves, but the complexity of determining transport block size increases
Solution Approach 1:
The patent handles the OCC complexity by incorporating it into the existing resource element allocation framework. The scaling factor method naturally accounts for OCC overhead by using the actual number of allocated resource elements, which already reflects the impact of OCC application. This approach integrates OCC considerations into the TBS determination without adding separate complex calculation steps.
Data Source
AI summary
A user equipment (UE) that includes one or more non-transitory computer-readable media storing one or more computer-executable instructions for determining the transport block size for a Physical Uplink Shared Channel (PUSCH) transmission and at least one processor coupled to the one or more non-transitory computer-readable media is provided. The processor is configured to execute the one or more computer-executable instructions to cause the UE to determine whether an Orthogonal Cover Code (OCC) is applied to the PUSCH transmission; determine a spreading factor of the OCC in a case that the OCC is applied to the PUSCH transmission; determine whether a condition is satisfied for determining the transport block size; and determine the transport block size using a scaling factor in a case the condition is satisfied, the scaling factor being determined based on the spreading factor.