DMRS Spacing Pattern for Multi-Slot Time Domain Allocation
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Solution Overview
Problem
Existing DMRS configurations and patterns are inadequate for time domain resource allocations (TDRA) that span multiple slots, leading to improper DMRS configuration, which can degrade channel estimation performance and waste network resources.
Innovation Solution
Implementing a DMRS pattern with time domain spacing pattern information, including a time domain spacing parameter and offset parameter, to ensure appropriate DMRS instances and spacing within TDRA, even when it spans multiple slots, enhancing synchronization and scheduling flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing DMRS configurations are used for TDRA spanning multiple slots, then device complexity is reduced, but channel estimation performance deteriorates and resource utilization becomes inefficient
Solution Approach 1:
The patent applies dynamics by making the DMRS configuration adaptive rather than static. The network node dynamically determines DMRS time domain locations based on the actual TDRA parameters (start symbol and length) when they span multiple slots. This allows the DMRS pattern to adjust automatically to different scheduling scenarios, improving channel estimation performance without requiring complex pre-configured patterns for every possible case.
Solution Approach 2:
The patent changes the parameter representation by introducing a new parameter format for indicating DMRS time domain locations. Instead of using fixed patterns, the configuration includes a start symbol indicator and a spacing indicator that can represent multiple time domain locations. This parameter transformation enables flexible DMRS placement across multiple slots while keeping the signaling overhead manageable.
2Reliability
If DMRS instances are increased for multi-slot TDRA, then channel estimation performance improves, but network resource utilization deteriorates
Solution Approach 1:
The patent applies local quality by placing DMRS instances selectively at specific time domain locations rather than uniformly across all slots. The spacing indicator parameter determines where DMRS instances are inserted based on local channel conditions and scheduling requirements. This ensures sufficient channel estimation performance at critical locations while avoiding unnecessary DMRS transmissions in other regions, thus reducing resource wastage.
3Adaptability or versatility
If flexible TDRA scheduling is implemented, then scheduling flexibility improves, but DMRS configuration complexity increases
Solution Approach 1:
The patent achieves universality by designing a DMRS configuration framework that can handle multiple scheduling scenarios with a unified parameter structure. The same configuration parameters (start symbol indicator, spacing indicator) work whether the TDRA spans one slot or multiple slots. This multi-functional approach enables flexible scheduling across different time domains without requiring separate configuration mechanisms for each scenario.
4Measurement precision
If proper DMRS spacing is ensured in multi-slot TDRA, then channel estimation performance improves, but signaling overhead increases
Solution Approach 1:
The patent applies partial action by using a compact parameter representation that indicates DMRS time domain locations without specifying every single detail. The spacing indicator parameter provides a condensed way to represent multiple time domain locations, transmitting only the essential information needed for proper DMRS spacing while avoiding excessive signaling overhead.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a configuration indicating a time domain spacing pattern information for a demodulation reference signal (DMRS), the time domain spacing pattern information indicating a time domain spacing parameter and a time domain offset parameter. The UE may receive a start and length indicator value (SLIV) indicating a time domain resource allocation associated with a channel. The UE may communicate, during the time domain resource allocation, one or more DMRSs associated with the channel at respective time domain locations that are based at least in part on the SLIV and the time domain spacing pattern information. Numerous other aspects are described.