PUSCH Consecutive Slot Scheduling for Better DMRS Channel Estimation
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Solution Overview
Problem
In new radio (NR) systems, the limited number of physical uplink shared channel (PUSCH) demodulation reference signals (DMRSs) in special slots leads to poor channel estimation and degraded system performance.
Innovation Solution
Consecutive slot scheduling is employed, where a second demodulation reference signal in a subsequent slot is scheduled based on a first demodulation reference signal in a special slot, utilizing common frequency, transmit power, and antenna alignment for improved channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the duration of scheduled PUSCH resources is limited in special slots, then the slot can be used for both downlink and uplink transmissions, but the number of PUSCH DMRSs is limited to one or two resulting in poor channel estimation
Solution Approach 1:
The patent schedules a subsequent slot with additional DMRS positions before the special slot transmission completes. By preparing the subsequent slot in advance with proper DMRS configuration, the system can compensate for the limited DMRS positions in the special slot, improving channel estimation accuracy without sacrificing slot flexibility.
Solution Approach 2:
The patent extends channel estimation into the time dimension by utilizing DMRS from consecutive slots (current slot and subsequent slot). This adds a temporal dimension to the channel estimation process, allowing the receiver to gather more reference signals across multiple time instances, thereby improving estimation accuracy while maintaining the limited DMRS count per slot.
2Duration of action of moving object
If the number of PUSCH DMRSs is limited to one or two in special slots, then the slot duration can be reduced for special transmission, but channel estimation performance degrades
Solution Approach 1:
The system pre-schedules the subsequent slot with appropriate DMRS positions before the special slot transmission begins. This preliminary scheduling ensures that when the special slot transmission completes, the receiver already has the necessary DMRS information from the subsequent slot to perform accurate channel estimation, compensating for the limited DMRS count in the special slot.
Solution Approach 2:
The patent maintains continuous channel estimation action across multiple slots by utilizing DMRS from both the special slot and the subsequent slot. This continuity allows the receiver to gather reference signals continuously over time, improving estimation accuracy while the PUSCH transmission duration in the special slot remains limited.
3Measurement precision
If consecutive slot scheduling is implemented with common frequency and antenna alignment, then channel estimation is improved, but the scheduling complexity increases
Solution Approach 1:
The patent makes the subsequent slot serve multiple functions: it carries both its own PUSCH transmission and provides additional DMRS signals for channel estimation of the special slot. By making the subsequent slot multi-functional, the system improves channel estimation accuracy without requiring separate dedicated resources, thereby limiting the increase in scheduling complexity.
Data Source
AI summary
Consecutive slot scheduling for physical uplink shared channel resources (e.g., using a computerized tool), is enabled. For example, a system can comprise: a processor and a memory that stores executable instructions that, when executed by the processor, facilitate performance of operations, comprising: determining a first demodulation reference signal of a special slot of a physical uplink shared channel, and based on the first demodulation reference signal, scheduling a second demodulation reference signal of a subsequent slot of the physical uplink shared channel, subsequent to the special slot, for uplink transmission via a user equipment common to the special slot and the subsequent slot.