Shared Channel Resource Mapping for PRS-Aware TBS Determination
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Solution Overview
Problem
The challenge of determining an accurate transport block size (TBS) in a slot that includes a symbol for positioning reference signal (PRS) transmission is not adequately addressed in existing GNSS systems, impacting positioning accuracy in applications with high accuracy requirements.
Innovation Solution
A method to determine the transport block size (TBS) by considering the quantity of resources occupied by the PRS within a frequency domain unit, using parameters such as time domain subunits and frequency domain intervals, and employing indication information for accurate resource allocation and multiplexing methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the TBS is determined without considering the quantity of time domain subunits occupied by the PRS, then the calculation process is simpler, but the TBS accuracy deteriorates and transmission performance is affected
Solution Approach 1:
The patent applies preliminary action by pre-determining the quantity of time domain subunits occupied by the PRS and using this information before TBS calculation. The first device determines the PRS resource occupancy in advance, then uses this predetermined information to accurately calculate the first resource quantity and subsequent TBS, avoiding the need to reconsider PRS occupancy during each TBS calculation while maintaining high accuracy.
2Measurement precision
If the TBS is determined by considering the PRS resource occupancy, then the TBS accuracy is improved, but the calculation complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the TBS determination process into distinct stages: first determining the quantity of time domain subunits occupied by the PRS, then calculating the first resource quantity based on this segmented information, and finally determining the TBS. This segmentation allows the system to handle complex calculations in manageable steps, improving accuracy while keeping the complexity organized and controllable.
Solution Approach 2:
The patent applies parameter changes by using the quantity of time domain subunits occupied by the PRS as a key parameter that changes the resource quantity calculation. By introducing this specific parameter (M_SLPRS) into the TBS determination formula, the system accurately reflects the actual available resources for data transmission, thereby improving TBS accuracy without requiring overly complex calculation mechanisms.
3Productivity
If the PRS and the second physical shared channel are located in the same time domain unit, then the resource utilization is more efficient, but the TBS determination becomes more difficult
Solution Approach 1:
The patent applies preliminary action by pre-determining the quantity of time domain subunits occupied by the PRS before the TBS calculation process. The first device determines M_SLPRS in advance, then uses this predetermined value to calculate the first resource quantity and subsequently the TBS. This preliminary determination simplifies the overall process by having the challenging measurement done once rather than repeatedly during TBS calculations.
Solution Approach 2:
The patent applies parameter changes by introducing the quantity of time domain subunits occupied by the PRS (M_SLPRS) as a specific parameter that modifies the resource quantity calculation. This parameter change allows the system to accurately account for PRS occupancy in the TBS determination formula, making the measurement process systematic and manageable despite the co-location of PRS and data channel.
Data Source
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Figure 2(a)~2(b)
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AI summary
Embodiments of this application provide a data transmission method and a communication apparatus. According to this application, a first device can determine, based on a quantity of time domain subunits occupied by a PRS, a quantity of resources of a first physical shared channel within a first frequency domain unit, and determine, based on the quantity of resources of the first physical shared channel within the first frequency domain unit, a TBS of a first TB transmitted on the first physical shared channel, to improve accuracy of the determined TBS and improve transmission performance.