Group Common DMRS Allocation for Wider PDSCH Channel Estimation
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Solution Overview
Problem
Existing wireless communication systems face challenges in effective channel estimation due to interference and limited resource allocation of demodulation reference signals, which arbitrarily restrict the effectiveness of channel estimation by user equipments (UEs).
Innovation Solution
The implementation of a group common demodulation reference signal (GC-DMRS) that is allocated the same size as physical downlink shared channels (PDSCHs) for a group of UEs, allowing for a wideband signal and non-contiguous resource allocation patterns to improve channel estimation and diversity gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a UE-specific DMRS is allocated to match the size of individual UE PDSCH, then channel estimation is limited to the specific UE's resource allocation, but this arbitrarily restricts the effectiveness of channel estimation and does not utilize available resources efficiently
Solution Approach 1:
The patent introduces a group common DMRS that serves multiple UEs simultaneously, making the reference signal universal rather than UE-specific. The group common DMRS is allocated to match the overall PDSCH resources for a group of UEs, enabling any UE in the group to use this shared reference signal for channel estimation across the entire allocated bandwidth, thus improving channel estimation effectiveness while efficiently utilizing available resources.
2Productivity
If DMRS resources are allocated to match individual UE PDSCH size, then resource allocation is UE-specific and limited, but this results in arbitrary limitations on channel estimation effectiveness and wasted resources
Solution Approach 1:
The patent merges the DMRS resources for multiple UEs into a single group common DMRS allocation. Instead of allocating separate UE-specific DMRS resources that match individual PDSCH sizes, the group common DMRS is allocated to match the overall PDSCH resources for the entire group, combining resources efficiently and enabling all UEs in the group to benefit from the full resource allocation for channel estimation.
3Ease of operation
If contiguous resource allocation is used for PDSCH, then resource allocation is simple and continuous, but this limits diversity gain and channel estimation effectiveness
Solution Approach 1:
The patent segments the overall PDSCH resources for a group of UEs into non-contiguous resource blocks. The group common DMRS is allocated across these non-contiguous resources, allowing UEs to perform channel estimation over a wider, more distributed frequency range. This segmentation provides frequency diversity gain and improves channel estimation effectiveness while maintaining manageable allocation through standardized signaling.
Data Source
AI summary
In some implementations, a method of wireless communication includes obtaining, at a user equipment (UE), an allocation of frequency resources for a group common demodulation reference signal (GC-DMRS) associated with a plurality of UEs that include the UE. The method also includes receiving, at the UE from a base station, a frequency domain resource allocation (FDRA) for a physical downlink shared channel (PDSCH) scheduled for transmission to the UE. The method includes receiving, from the base station, the GC-DMRS and the PDSCH. The method also includes generating a channel estimate based on the GC-DMRS and the allocation of frequency resources to the GC-DMRS. The method further includes demodulating the PDSCH based on the channel estimate. Other aspects and features are also claimed and described.