PDCCH Repetition Monitoring Under Blind Decode Limits
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Solution Overview
Problem
Existing wireless communication systems face challenges in enhancing the coverage of physical downlink control channels (PDCCH) for reduced capability wireless transmit/receive units (WTRUs, such as in 5G new radio (NR) networks, particularly in managing blind decodes and beam coverage.
Innovation Solution
Implementing overbooking rules to limit the number of blind decodes, applying coverage enhancement (CE) levels, and configuring PDCCH monitoring with repetitions, along with determining priority between search spaces to optimize PDCCH monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDCCH repetitions are configured to enhance coverage, then coverage reliability is improved, but the number of blind decodes increases exceeding the decoding limit
Solution Approach 1:
The patent segments the search space into first and second search spaces with different monitoring requirements. The first search space monitors PDCCH candidates without repetitions (lower decoding count), while the second search space monitors PDCCH candidates with repetitions (higher decoding count). This segmentation allows the device to manage blind decode limits effectively while maintaining coverage reliability for reduced capability WTRUs.
2Reliability
If multiple search spaces are monitored to ensure complete PDCCH detection, then detection reliability is improved, but processing complexity increases
Solution Approach 1:
The patent implements dynamic monitoring selection where the device determines which search space(s) to monitor based on priority rules and decoding limits. The device can selectively monitor the first search space, the second search space, or both depending on the configured parameters and current operational requirements. This dynamic approach maintains detection reliability while managing processing complexity through adaptive monitoring strategies.
Data Source
AI summary
Systems, methods, and instrumentalities are described herein for physical downlink control channel (PDCCH) coverage enhancement for reduced capability wireless transmit/receive units (WTRUs). Overbooking rules may be applied, for example, to limit the number of blind decodes, e.g., if/when PDCCH is repeated. A coverage enhancement (CE) level may be determined for a beam. Link recovery may be performed with CE levels. A PDCCH monitoring configuration may include repetitions. The number of blind decodes with repetitions may be limited. A WTRU may report an indication of a best repetition. A WTRU may be configured to perform a measurement associated with a PDCCH repetition, e.g., if/when a PDCCH subject to PDCCH repetition is successfully decoded.