FDMed PDSCH Rate Matching With Shared DMRS for Frequency Diversity
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Solution Overview
Problem
FDMed PDSCHs in wireless communications systems are vulnerable to fading and interference due to confinement within smaller frequency portions, leading to poor spectral efficiency and user experience, as they do not span the entire frequency band.
Innovation Solution
Implement joint frequency domain PDSCH rate matching techniques, where a network entity provides a first FDRA indicating a continuous set of frequency resources for multiple PDSCH transmissions and a second FDRA specifying a subset of resources for individual UE transmissions, spreading FDMed PDSCHs across the entire frequency band to enhance frequency diversity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If FDMed PDSCHs are allocated continuous frequency resources for multiple UEs, then spectral efficiency is improved, but frequency diversity is reduced due to confinement within smaller frequency portions
Solution Approach 1:
The continuous frequency resources are segmented into multiple subsets, where each subset is allocated to different UEs for FDMed PDSCH transmissions. This segmentation allows multiple UEs to share the same frequency band while maintaining frequency diversity by distributing them across different frequency portions within the continuous set.
Solution Approach 2:
The patent introduces a new dimension of frequency resource allocation by transitioning from individual UE allocations to a continuous set that spans multiple UEs. This dimensional change enables the system to achieve both spectral efficiency (through continuous allocation) and frequency diversity (through multi-UE distribution across the continuous set).
2Adaptability or versatility
If FDMed PDSCHs are confined to smaller frequency portions, then resource allocation flexibility is improved, but susceptibility to fading and interference increases
Solution Approach 1:
Multiple individual frequency allocations for different UEs are merged into a single continuous set of frequency resources. This merging approach maintains the flexibility of individual UE allocations while collectively spanning a broader frequency range, thereby reducing susceptibility to fading and interference through frequency diversity.
3Reliability
If the entire frequency band is allocated to a single UE, then frequency diversity is maximized, but spectral efficiency decreases due to underutilization
Solution Approach 1:
The continuous set of frequency resources is designed to serve multiple UEs simultaneously through FDMed PDSCH transmissions. This universal allocation approach allows the entire frequency band to be utilized across multiple UEs, achieving both high spectral efficiency and maintained frequency diversity through the distributed nature of the allocation.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for demodulation reference signal (DMRS) sharing and physical downlink shared channel (PDSCH) rate matching for frequency division multiplexed (FDMed) PDSCHs. A method performed by a user equipment (UE) may include receiving a first frequency domain resource allocation (FDRA) comprising an indication of a continuous set of frequency resources allocated for transmission of a plurality of FDMed PDSCH transmissions for a plurality of UEs, including the UE, receiving a second FDRA comprising an indication of a subset of frequency resources, of the continuous set of frequency resources, on which one or more PDSCH transmissions, of the plurality of FDMed PDSCH transmissions, for the UE are scheduled, and receiving, using the first FDRA and the second FDRA, the one or more PDSCH transmissions for the UE on the subset of frequency resources.