Terminal Device Multi-Slot PUSCH Transmission for Channel Estimation
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Solution Overview
Problem
In NR Rel-15 and 16, increasing resources in the frequency domain for PUSCH transmission leads to lower power density and worse channel estimation accuracy, while relying solely on time domain resources results in inefficient channel utilization and increased latency.
Innovation Solution
The method involves configuring a terminal device to transmit a TB over multiple slots, utilizing parameters such as S, L, and N to determine symbol allocation across slots, with options for frequency hopping and different types of TBOMS transmissions to optimize resource use and reduce CRC overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If resources in frequency domain are increased for PUSCH transmission, then data rate is improved, but power density decreases and channel estimation accuracy worsens
Solution Approach 1:
The patent extends TB transmission from a single slot to multiple slots (time dimension), allowing the same TB to be transmitted across N slots with configurable symbol allocations. This temporal extension provides additional resources for transmission without increasing frequency domain resources, thereby maintaining power density while improving overall transmission capacity and reliability through time-diversity.
Solution Approach 2:
The patent introduces configurable parameters (S, L, N) to dynamically adjust the transmission characteristics. Parameter N controls the number of slots for TB transmission, parameter S controls the starting symbol, and parameter L controls the number of contiguous symbols. These parameter changes enable flexible adaptation of time domain resources to achieve the desired data rate while maintaining adequate power density and channel estimation accuracy.
2Measurement precision
If resources in time domain are increased for PUSCH transmission, then channel estimation accuracy is improved, but latency increases
Solution Approach 1:
The patent enables dynamic configuration of time domain resources through parameters S, L, and N, allowing the system to adapt the number of slots and symbol allocations based on channel conditions and latency requirements. This dynamic adjustment optimizes the trade-off between channel estimation accuracy (achieved through sufficient time domain resources) and latency (controlled by limiting the maximum number of slots N).
Solution Approach 2:
By configuring parameter N to control the maximum number of slots for TB transmission, the patent allows flexible adjustment of time domain resources. When latency is critical, N can be set to a smaller value, limiting the time extension. When channel estimation accuracy is more important, N can be increased to provide more time domain resources, thus dynamically optimizing the trade-off between these two objectives.
3Loss of information
If TB transmission is extended over multiple slots, then CRC overhead is reduced and coding rate is improved, but device complexity increases
Solution Approach 1:
The patent segments the TB transmission across multiple slots (N slots) rather than confining it to a single slot. This segmentation allows the CRC overhead to be amortized over a larger total number of transmitted symbols, effectively reducing the relative CRC overhead and improving the coding rate. The configuration parameters (S, L, N) provide a systematic way to manage this segmentation while controlling complexity through standardized configuration procedures.
Data Source
AI summary
The present disclosure provides a method in a network device. The method includes: determining a configuration for a terminal device to transmit a Transmission Block, TB, the configuration indicating at least a transmission mode in which a single TB is allowed to be transmitted over more than one slot; transmitting the configuration to the terminal device; and receiving the TB that is transmitted from the terminal device according to the configuration.