PDCCH Candidate Indication for Reduced Blind Decoding
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Solution Overview
Problem
The increasing demand for wireless data traffic in 5G communication systems necessitates improvements in radio interface efficiency and coverage, particularly in managing the high number of blind decodings required for downlink control channels, which can be resource-intensive and inefficient.
Innovation Solution
Implementing reduced blind decoding techniques for downlink control channels by providing user equipment and base stations with transceivers and processors to identify and transmit PDCCH candidates based on specific starting control channel elements and aggregation levels, optimizing the decoding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional blind decoding is used for downlink control channels, then the UE can detect all possible PDCCH candidates, but the number of blind decodings becomes excessively high causing high power consumption and processing burden
Solution Approach 1:
The patent applies preliminary action by having the gNB transmit indication information before the actual PDCCH transmission. This indication information tells the UE which specific PDCCH candidates it needs to decode, allowing the UE to perform blind decoding only for indicated candidates rather than all possible candidates, thereby reducing power consumption while maintaining detection reliability for relevant control information
Solution Approach 2:
The patent extracts the essential function of blind decoding by removing the unnecessary part of decoding all possible PDCCH candidates. Instead, the system extracts only the indicated PDCCH candidates that the UE actually needs, separating the useful decoding operations from the wasteful ones, thus reducing overall power consumption while preserving necessary detection capability
2Productivity
If the gNB transmits indication information for PDCCH candidates, then the number of blind decodings is reduced, but the signaling overhead increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the decoding parameters based on channel conditions and UE requirements. The gNB changes parameters such as aggregation level, starting CCE index, and number of candidates to be decoded based on actual transmission needs, allowing flexible adaptation that reduces overhead compared to fixed comprehensive decoding configurations
Solution Approach 2:
The patent implements dynamics by making the blind decoding configuration adaptive rather than static. The indication information transmitted by the gNB varies based on real-time conditions, allowing the system to dynamically adjust which PDCCH candidates need decoding, thereby optimizing the balance between signaling overhead and decoding efficiency for different scenarios
3Reliability
If multiple PDCCH candidates are monitored, then the coverage and reliability of control channel reception is improved, but the processing time and computational burden increase
Solution Approach 1:
The patent applies preliminary action by having the gNB prepare and transmit indication information that specifies which PDCCH candidates are relevant before the UE needs to process them. This allows the UE to focus computational resources only on indicated candidates rather than systematically processing all possible candidates, reducing processing time while maintaining reception reliability for important control information
Data Source
AI summary
Methods and apparatuses for reduced blind decoding for downlink (DL) control channels. A method of operating a user equipment (UE) includes receiving first information for a search space (SS) set, receiving second information for a first channel associated with the SS set, and receiving an instance of the first channel. The instance of the first channel includes third information. The instance of the first channel is associated with a physical downlink control channel (PDCCH) monitoring occasion (MO) of the SS set. The method further includes, based on the third information, identifying a first PDCCH candidate in the PDCCH MO and receiving the first PDCCH candidate. The third information includes a starting control channel element (CCE) of the first PDCCH candidate and an aggregation level (AL) of the first PDCCH candidate.