DMRS Time Domain Mapping in Multi-Slot Transport Blocks
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR and LTE, face challenges in accurately mapping time domain positions for demodulation reference signals (DMRS) across multiple slots, leading to suboptimal channel estimation and uplink performance in multi-slot transport block transmissions.
Innovation Solution
The technique involves identifying and mapping time domain positions for DMRS within multi-slot transport blocks, enabling channel estimation at the receiver and supporting DMRS bundling, which reduces signaling overhead and improves uplink performance by ensuring accurate data rate and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If DMRS is transmitted across multiple slots, then channel estimation accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent segments the multi-slot TB transmission into individual slots, with each slot containing its own DMRS. This allows the receiver to perform channel estimation per slot while maintaining the benefits of multi-slot transmission. The segmentation enables accurate channel estimation without requiring excessive signaling overhead by distributing DMRS across multiple smaller units.
Solution Approach 2:
The patent performs preliminary identification and mapping of time domain positions for DMRS before the actual transmission. By pre-determining the exact positions of DMRS within each slot of the multi-slot TB, the system enables accurate channel estimation without requiring additional signaling during transmission, thus reducing overhead while maintaining estimation accuracy.
2Device complexity
If DMRS time domain positions are not accurately mapped, then device complexity is reduced, but uplink performance deteriorates
Solution Approach 1:
The patent employs parameter changes by identifying and mapping specific time domain positions for DMRS within each slot of the multi-slot TB. By systematically determining the exact temporal locations of DMRS and configuring the transmission parameters accordingly, the system achieves accurate channel estimation and improved uplink performance without excessive complexity in the mapping process.
3Productivity
If multi-slot TB transmission is used, then data rate is improved, but latency increases
Solution Approach 1:
The patent segments the multi-slot TB transmission into individual slots with DMRS in each slot. This segmentation allows for more efficient channel estimation and faster processing at the receiver, reducing the overall latency while maintaining the high data rates enabled by multi-slot transmission. The per-slot DMRS structure enables parallel processing and reduces waiting time.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for mapping time domain positions for a demodulation reference signal (DMRS). A method that may be performed by a user equipment (UE) includes identifying time domain positions for a DMRS to be transmitted with a transport block (TB) sent across multiple slots and transmitting the TB across the multiple slots with the DMRS in the time domain positions.