DMRS Power Measurement for PDCCH Blind Decoding Optimization
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Solution Overview
Problem
In wireless communication systems, user equipment (UE) faces challenges in decoding physical downlink control channels (PDCCH) due to complex decoding processes and poor signal strength, leading to resource-intensive blind decoding attempts and unreliable channel quality.
Innovation Solution
A method where a scheduled entity measures the power level of a demodulation reference signal (DMRS) before blind decoding a PDCCH candidate, only proceeding if the power level is above a predetermined threshold, and a scheduling entity configures blind decoding settings to enable this measurement for multiple PDCCH candidates, limiting the number of blind decodings to optimize resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs blind decoding on all PDCCH candidates in the search space, then the UE can potentially decode control information from any candidate, but the resource expenditure increases and reliability decreases due to poor signal strength on some candidates
Solution Approach 1:
The UE performs DMRS power level measurement before blind decoding to pre-assess the quality of each PDCCH candidate. This preliminary action allows the UE to identify and filter out candidates with insufficient power levels, avoiding wasted decoding attempts on unreliable signals and thereby improving overall channel quality while reducing resource expenditure.
2Reliability
If the UE filters PDCCH candidates based on DMRS power level, then the quality and reliability of decoded DCI improves, but the complexity of the decoding process increases
Solution Approach 1:
The filtering based on DMRS power level measurement is performed before blind decoding, serving as a preliminary quality assessment step. This approach improves DCI reliability by eliminating poor-quality candidates while the added complexity is minimal compared to the full blind decoding process, as it only requires power level comparison against a threshold.
3Productivity
If the UE decodes PDCCH candidates with poor signal strength, then more candidates are processed, but the channel quality and reliability of the decoded information deteriorates
Solution Approach 1:
The UE extracts and removes PDCCH candidates with DMRS power levels below the threshold from the set of candidates to be blindly decoded. This extraction process ensures that only candidates meeting the minimum quality requirement are processed, maintaining high channel quality and reliability while still allowing a sufficient number of viable candidates to be decoded.
Data Source
AI summary
A scheduled entity measures a power level of a demodulation reference signal (DMRS) prior to blind decoding a physical downlink control channel (PDCCH) candidate associated with the DMRS. The scheduled entity performs blind decoding of the PDCCH candidate if the power level is above a predetermined threshold or foregoes blind decoding if the power level is below the predetermined threshold. A scheduling entity transmits a blind decoding configuration setting to the scheduled entity. The scheduling entity enables, via the blind decoding configuration setting, measurement, at the scheduled entity, of power levels of a plurality of DMRSs prior to blind decoding a plurality of respective PDCCH candidates associated with the plurality of DMRSs. Only PDCCH candidates associated with DMRSs having power levels that are above the predetermined threshold are blind decoded. A predetermined number of PDCCH candidates are scheduled for blind decoding. Blind decoding stops when the predetermined number is reached.