FDRA Signaling for Shared DMRS in Non-Contiguous Downlink PRGs
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Solution Overview
Problem
Existing frequency domain resource allocation (FDRA) signaling for frequency division multiplexed downlink transmissions with demodulation reference signal (DMRS) sharing faces challenges in efficiently indicating non-contiguous frequency allocations and controlling PRGs and RBGs, leading to inefficiencies in resource utilization and channel estimation.
Innovation Solution
Partitioning the bandwidth part (BWP) into multiple precoding resource block groups (PRGs) and using bitmaps or resource indicator values (RIVs) to indicate the PRGs occupied by a common wideband DMRS, along with interleaver depths or explicit RBG indexing to control RBG allocations, enabling flexible and efficient FDRA signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing FDRA signaling is used for frequency division multiplexed downlink transmissions with DMRS sharing, then resource allocation can be indicated, but it faces challenges in efficiently indicating non-contiguous frequency allocations and controlling PRGs and RBGs, leading to inefficiencies in resource utilization and channel estimation
Solution Approach 1:
The bandwidth part is segmented into multiple precoding resource block groups (PRGs), and bitmaps or resource indicator values (RIVs) are used to indicate the PRGs occupied by a common wideband DMRS. This segmentation enables flexible and efficient FDRA signaling for non-contiguous frequency allocations, directly resolving the contradiction by improving resource utilization efficiency while managing signaling complexity through structured division.
Solution Approach 2:
The patent employs dynamic control mechanisms for PRG and RBG allocations using interleaver depths or explicit RBG indexing. This dynamic approach allows the system to adaptively optimize resource allocation for different transmission scenarios, improving productivity by enabling efficient non-contiguous frequency allocations while maintaining manageable signaling complexity through flexible configuration.
2Measurement precision
If existing FDRA signaling is used for frequency division multiplexed downlink transmissions with DMRS sharing, then resource allocation can be indicated, but it leads to inefficiencies in channel estimation due to inability to effectively control PRGs and RBGs
Solution Approach 1:
By segmenting the bandwidth part into multiple PRGs and using bitmaps or RIVs to indicate DMRS-occupied PRGs, the patent enables precise control over the frequency resources used for channel estimation. This segmentation improves measurement precision by allowing targeted channel estimation across specific PRGs while managing signaling structure complexity through systematic organization.
Solution Approach 2:
The patent applies local quality control by enabling different PRGs and RBGs to have specific configurations optimized for their local characteristics. This allows channel estimation to be performed with appropriate precision for each local region, improving overall measurement precision while the structured signaling approach keeps complexity manageable.
3Productivity
If existing FDRA signaling is used for frequency division multiplexed downlink transmissions with DMRS sharing, then basic resource allocation can be performed, but it results in inefficiencies in resource utilization due to inability to flexibly indicate non-contiguous allocations
Solution Approach 1:
The segmentation of bandwidth into PRGs with bitmap or RIV-based indication enables compact representation of non-contiguous frequency allocations. This approach improves productivity by efficiently indicating complex allocation patterns while reducing signaling overhead compared to traditional methods that would require more extensive signaling for the same level of flexibility.
Solution Approach 2:
The patent utilizes parameter changes through interleaver depths and explicit RBG indexing to control resource allocations dynamically. By changing these parameters, the system can efficiently represent various allocation patterns including non-contiguous allocations, improving resource utilization efficiency while maintaining compact signaling that minimizes 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 downlink control information (DCI) that includes a first frequency domain resource allocation (FDRA) indicating a set of precoding resource block groups (PRGs) occupied by a demodulation reference signal (DMRS) and a second FDRA indicating a set of resource blocks (RBs) occupied by a physical downlink shared channel (PDSCH) within each PRG in the set of the PRGs occupied by the DMRS. The UE may receive the DMRS in accordance with the first FDRA. The UE may receive the PDSCH in accordance with the second FDRA. Numerous other aspects are described.