Adaptive Inter-Slot DMRS Patterns for High-Frequency Channel Tracking
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Solution Overview
Problem
In high-frequency communication scenarios, such as those using the sub-THz frequency band, transmitting demodulation reference signals (DMRS) in each slot leads to unnecessary resource consumption due to channel coherency spanning multiple slots and sensitivity to uncompensated sampling time offset, resulting in degraded communication performance.
Innovation Solution
Implementing intra-slot and inter-slot DMRS patterns dynamically, where DMRSs are transmitted only in a subset of slots based on factors like Doppler shift, SNR, and synchronization reference signal periodicity, reducing signaling overhead and improving time and frequency tracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DMRS are transmitted in each slot, then channel estimation accuracy is maintained, but resource consumption increases unnecessarily due to channel coherency spanning multiple slots
Solution Approach 1:
The patent applies periodic action by transmitting DMRS only in specific slots rather than continuously in every slot. The network entity determines DMRS transmission based on channel coherency characteristics, creating a periodic transmission pattern that reduces resource consumption while maintaining estimation accuracy. This is achieved through dynamic determination of DMRS transmission timing based on channel conditions.
Solution Approach 2:
The patent implements dynamics by making DMRS transmission adaptive rather than static. The network entity dynamically determines whether to transmit DMRS in a given slot based on real-time channel coherency assessment, Doppler shift, SNR, and synchronization reference signal periodicity. This dynamic approach allows the system to optimize resource consumption while maintaining reliability.
2Reliability
If DMRS are transmitted in each slot, then channel estimation is performed continuously, but time and frequency tracking performance degrades due to sensitivity to uncompensated sampling time offset
Solution Approach 1:
The patent applies feedback by using channel coherency information, Doppler shift measurements, SNR values, and synchronization reference signal periodicity to dynamically determine DMRS transmission timing. This feedback mechanism allows the system to optimize tracking performance by transmitting DMRS only when necessary, reducing the impact of sampling time offset accumulation.
3Loss of energy
If DMRS transmission is reduced to save resources, then resource consumption decreases, but channel estimation may become insufficient for accurate demodulation
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting DMRS transmission parameters based on channel conditions. The network entity changes transmission timing, frequency, and pattern parameters according to channel coherency, Doppler shift, SNR, and synchronization reference signal periodicity. This allows the system to maintain estimation sufficiency while reducing resource consumption through adaptive parameter adjustment.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a network entity, a demodulation reference signal (DMRS) configuration indicating an intra-slot DMRS pattern. The UE may receive, from the network entity, an indication of an inter-slot DMRS pattern. The UE may communicate, with the network entity, a message that is associated with a time domain resource allocation that includes multiple slots, the message including one or more DMRSs in accordance with the intra-slot DMRS pattern and the inter-slot DMRS pattern. Numerous other aspects are provided.