PDCCH Assistance Information for Reduced Blind Decoding
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Solution Overview
Problem
The increasing demand for wireless data traffic in 5G communication systems necessitates improved radio interface efficiency and coverage, particularly in high-frequency bands, where blind decoding for downlink control channels is resource-intensive and inefficient.
Innovation Solution
Implementing reduced blind decoding techniques by providing assistance information (PAI) for PDCCH candidates in subsequent slots or monitoring occasions, allowing devices to determine and monitor specific PDCCH candidates based on this information, thereby optimizing decoding processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If blind decoding is performed for all PDCCH candidates in all slots, then downlink control reliability is improved, but computational burden and resource usage increase significantly
Solution Approach 1:
The patent applies preliminary action by providing assistance information (PAI) in advance that indicates which PDCCH candidates are likely to contain valid DCI formats. This allows the UE to perform blind decoding only on indicated candidates rather than all possible candidates, reducing computational burden while maintaining reliability through targeted decoding based on network-provided hints.
Solution Approach 2:
The patent extracts the essential function of blind decoding by removing the unnecessary part of decoding all PDCCH candidates. Through PAI indication, the system extracts only the necessary candidates that contain valid DCI formats, eliminating redundant decoding operations and reducing computational resources required while maintaining control reliability.
2Reliability
If blind decoding is performed for all PDCCH candidates in all slots, then downlink control coverage is improved, but processing time and efficiency deteriorate
Solution Approach 1:
The network provides assistance information in advance that pre-indicates which PDCCH candidates are likely to contain valid DCI formats. This allows the UE to focus decoding efforts only on indicated candidates, improving decoding efficiency by avoiding unnecessary processing of unlikely candidates while maintaining comprehensive coverage through the network's intelligent indication mechanism.
Solution Approach 2:
The patent extracts the inefficient part of blind decoding by removing the requirement to decode all PDCCH candidates. Through PAI, the system extracts only the necessary candidates for decoding, significantly improving processing efficiency and reducing time consumption while maintaining adequate control coverage through targeted decoding.
3Productivity
If assistance information is provided for PDCCH candidates in subsequent slots, then blind decoding efficiency is improved, but system complexity increases
Solution Approach 1:
The patent introduces assistance information (PAI) as an intermediary element that bridges the network and UE. This PAI mechanism, transmitted through existing downlink control channels, provides decoding hints without requiring fundamental changes to the core PDCCH structure. The intermediary PAI enables efficient blind decoding by guiding the UE to relevant candidates while maintaining compatibility with existing system architecture.
Solution Approach 2:
The assistance information mechanism is designed to be universally applicable across different PDCCH candidates and slots. The same PAI indication approach works for various DCI formats and scheduling scenarios, providing multi-functional benefit without requiring separate complex mechanisms for different cases. This universal approach improves decoding efficiency across the board while avoiding the need for case-specific complexity.
Data Source
AI summary
Methods and apparatuses for reduced blind decoding for downlink control. A method for a user equipment (UE) includes receiving first information for a first control resource set (CORESET) and receiving a first physical downlink control channel (PDCCH) in a CORESET. The reception of the PDCCH is in a first slot or a first PDCCH monitoring occasion (MO). The first PDCCH provides a first downlink control information (DCI) format. The first DCI format includes PDCCH assistance information (PAI) associated with a second PDCCH in a second slot or a second PDCCH MO. The CORESET is the first CORESET or a second CORESET. The method further includes determining, based on the PAI, second one or more PDCCH candidates within the first CORESET and monitoring the second PDCCH in the second one or more PDCCH candidates and the second slot or the second PDCCH MO.