PDCCH DMRS Distinction for Efficient Downlink Channel Combining
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Solution Overview
Problem
User equipment (UE) faces challenges in distinguishing between RMSI PDCCH candidates and other PDCCH types, leading to inefficient PDCCH combination and increased memory burden due to excess PDSCH buffering, which affects energy efficiency.
Innovation Solution
Assigning a unique RMSI PDCCH-specific DMRS scrambling identifier and including a one-bit indication in the MIB to help the UE accurately identify RMSI PDCCH, allowing for efficient PDCCH combination and reducing buffering requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If UE monitors multiple PDCCH search spaces for DCI without channel-specific DMRS distinction, then UE can receive downlink control information, but UE cannot accurately distinguish RMSI PDCCH candidates from other PDCCH types leading to inefficient PDCCH combination
Solution Approach 1:
The patent segments the PDCCH search spaces into different types (first PDCCH search space and second PDCCH search space) associated with different DMRS scrambling identifiers. This segmentation allows the UE to distinguish between RMSI PDCCH candidates and other PDCCH types by monitoring specific search spaces with unique DMRS identifiers, thereby improving identification accuracy while managing complexity through structured organization.
Solution Approach 2:
The patent applies local quality by assigning channel-specific DMRS scrambling identifiers to different PDCCH search spaces. Each search space has a unique DMRS identifier that provides local distinction, enabling the UE to accurately identify RMSI PDCCH candidates without requiring complex global differentiation mechanisms across all search spaces.
2Reliability
If UE buffers all PDSCH candidates without accurate PDCCH distinction, then UE ensures complete data reception, but UE increases memory burden and energy consumption due to excess buffering
Solution Approach 1:
The patent enables preliminary action by using DMRS scrambling identifiers to pre-identify and distinguish RMSI PDCCH candidates before the UE needs to buffer PDSCH data. This preliminary distinction allows the UE to selectively buffer only the necessary PDSCH candidates associated with RMSI PDCCH, reducing unnecessary buffering and associated energy consumption while maintaining reception reliability.
Solution Approach 2:
The patent changes the parameter of DMRS scrambling identifier to enable differentiation between PDCCH types. By utilizing this parameter change, the UE can accurately identify which PDSCH candidates correspond to RMSI PDCCH and buffer only those, optimizing memory usage and energy expenditure while ensuring reliable reception of critical system information.
3Productivity
If UE combines PDCCH candidates without channel-specific DMRS identification, then UE simplifies processing, but UE cannot efficiently combine RMSI PDCCH from multiple search spaces
Solution Approach 1:
The patent segments the PDCCH candidates into different groups based on their associated DMRS scrambling identifiers. This segmentation enables the UE to efficiently combine RMSI PDCCH candidates from multiple search spaces by using the DMRS identifier as a grouping key, improving combination efficiency while maintaining relatively simple processing through structured categorization.
Solution Approach 2:
The patent introduces DMRS scrambling identifier as an intermediary element that mediates between different PDCCH search spaces and the UE's processing functions. This intermediary allows the UE to efficiently combine PDCCH candidates from multiple search spaces by using the DMRS identifier as a common reference point, simplifying the combination process while improving productivity.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described herein. A user equipment (UE) may utilize system information signaling to initiate and maintain synchronized communications. The UE may monitor a first physical downlink control channel (PDCCH) search space and a second PDCCH search space for downlink control information (DCI) associated with a channel-specific demodulation reference signal (DMRS) scrambling identifier. In some aspects, the channel-specific DMRS scrambling identifier may identify a remaining minimum system information (RMSI)-specific PDCCH, or other PDCCH types. The UE may receive DCI associated with the channel-specific DMRS scrambling identifier according to the monitoring, such that the DCI is received in accordance with a combination of a first DCI candidate of the first PDCCH search space and a second DCI candidate of the second PDCCH search space. The UE may then receive a physical downlink shared channel (PDSCH) transmission in accordance with scheduling included in the DCI.