Flexible PDCCH Repetition for Reduced-Complexity UE Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In fifth-generation cellular systems, devices with reduced antennas and RF bandwidth face inefficiencies in PDCCH/PDSCH channel coverage and reliability, necessitating improved communication methods to enhance reception and transmission reliability and flexibility.
Innovation Solution
The implementation of flexible PDCCH repetition methods, where user equipment (UE) and base stations determine optimal PDCCH repetition based on received information, allowing for efficient PDCCH monitoring and PDSCH transmission scheduling to maintain communication flexibility and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the number of Rx/Tx antennas and RF bandwidth are reduced to lower UE complexity and cost, then device complexity is reduced, but PDCCH/PDSCH channel coverage and reception reliability deteriorate
Solution Approach 1:
The patent implements dynamic PDCCH repetition where the base station determines the number of repetitions (K) based on channel conditions and UE capabilities. The UE monitors PDCCH repetitions across multiple slots with flexible configuration, allowing the system to adapt between 1-32 repetitions. This dynamic approach maintains reliability for reduced-complexity UEs by increasing repetition count when needed, while avoiding unnecessary overhead when channel conditions are good.
2Device complexity
If the number of Rx/Tx antennas and RF bandwidth are reduced to lower UE complexity and cost, then device complexity is reduced, but channel coverage deteriorates
Solution Approach 1:
The patent employs dynamic PDCCH repetition with the base station determining the repetition count K (1-32) based on channel quality indicators and UE feedback. Reduced-complexity UEs can be configured with higher repetition counts to extend coverage, while UEs with better channel conditions use fewer repetitions. This dynamic adaptation allows coverage extension for low-complexity devices without mandating high repetition counts for all UEs.
3Reliability
If flexible PDCCH repetition is implemented to improve reception reliability and coverage, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements self-service mechanisms where the base station determines the PDCCH repetition count K and provides configuration information to the UE. The UE autonomously monitors PDCCH repetitions based on received configuration parameters without requiring complex decision-making logic. The network side handles the complexity of determining optimal repetition counts, while UEs simply follow configured monitoring patterns, thus achieving high reliability without significantly increasing UE complexity.
Data Source
AI summary
A user equipment (UE) includes reception circuitry configured to receive, from a base station, first information indicating a slot format and second information indicating a maximum number of PDCCH repetition, and to monitor, based on the second information, PDCCH repetitions for a first search space set in a first CORESET, and processing circuitry configured to determine, based on the first information, whether to omit monitoring a PDCCH repetition for each PDCCH repetition among the PDCCH repetitions, wherein Downlink Control Information (DCI) is carried by the PDCCH repetition, the DCI schedules a PDSCH, and the DCI includes third information indicating a first number and forth information indicating timing of the PDSCH, and to determine, based on the third information, a first slot in which the last one PDCCH repetition of the PDCCH repetitions with the first number is located, and to determine a starting slot of a PDSCH transmission based on the forth information and the first slot.