PDCCH Receive Time Determination via PDSCH Reference Symbols
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Solution Overview
Problem
Current wireless communication systems face challenges in accurately determining the receive time of the Physical Downlink Control Channel (PDCCH) due to the reliance on the latest reference symbol of the PDCCH itself, which can lead to timing inaccuracies affecting various operations.
Innovation Solution
The proposed solution involves using a reference symbol associated with the Physical Downlink Shared Channel (PDSCH) to determine the effective receive time of the PDCCH, particularly when the PDSCH includes a piggybacked DCI for one or more UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the latest reference symbol of the PDCCH itself is used to determine receive time, then the timing determination is straightforward, but timing inaccuracies occur affecting CSI reporting, PUSCH timing, PDSCH timing, and beam switching
Solution Approach 1:
The patent introduces an intermediary reference signal (DMRS or other reference signals in PDSCH) to mediate the timing determination process. Instead of directly using PDCCH reference symbols, the UE determines PDCCH receive time based on reference symbols in PDSCH, which serve as an intermediate reference point. This intermediary approach resolves the timing accuracy issue while maintaining manageable system complexity.
Solution Approach 2:
The patent changes the reference parameter from PDCCH reference symbols to PDSCH reference symbols (such as DMRS). By changing which reference signal is used as the timing baseline, the system achieves more accurate timing determination for subsequent operations without fundamentally altering the timing determination mechanism's complexity.
2Productivity
If PDCCH receive time is determined without considering PDSCH reference symbol, then the processing is simpler, but various operations such as CSI reporting and beam switching experience performance degradation
Solution Approach 1:
The PDSCH reference symbol acts as an intermediary that connects the PDCCH reception timing with subsequent operations. By using this intermediary reference point, the system achieves both operational efficiency and timing accuracy, as the reference symbol provides a precise timing anchor that propagates through all dependent operations.
Solution Approach 2:
The patent establishes the timing relationship between PDCCH and PDSCH in advance through pre-configuration. The UE is预先 configured with the timing offset between PDCCH receive time and PDSCH reference symbol, allowing accurate timing determination before actual operations occur, thus ensuring both efficiency and precision.
3Loss of information
If two-stage DCI is transmitted with second DCI in PDSCH, then signaling efficiency is improved, but accurate timing determination for PDCCH becomes more difficult
Solution Approach 1:
In the two-stage DCI transmission scenario, the PDSCH reference symbol serves as an intermediary that enables accurate PDCCH timing determination even when the second DCI is embedded in PDSCH. This intermediary reference allows the UE to accurately determine PDCCH receive time, which is critical for correctly interpreting the two-stage DCI structure and maintaining signaling efficiency.
Solution Approach 2:
The patent changes the timing reference parameter from PDCCH-specific reference symbols to PDSCH reference symbols when two-stage DCI is used. This parameter change resolves the timing determination difficulty introduced by the complex two-stage DCI structure while preserving the signaling efficiency benefits of the two-stage approach.
Data Source
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AI summary
In an aspect, a PDCCH and a PDSCH are transmitted by a BS to a UE, whereby the PDCCH includes a first DCI part and the PDSCH includes a second DCI part (e.g., a 2-part DCI). In an example, the BS and UE each determine at least one timing value associated with an effective receive time for the PDCCH based upon a reference symbol of the PDSCH.