PDCCH Repetition Scheduling for NR-Lite Coverage
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Solution Overview
Problem
The coverage loss in NR-lite terminals due to capacity reduction necessitates enhanced PDCCH transmission, as existing methods are inadequate for repeated transmissions.
Innovation Solution
A method involving sending a search space configuration parameter that includes a quantity of repeated transmissions, determining candidate time units based on this parameter, and transmitting PDCCH on these units to ensure effective coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDCCH transmission is enhanced for NR-lite terminals to compensate for capacity reduction, then coverage is improved, but transmission complexity increases
Solution Approach 1:
The PDCCH transmission is segmented into multiple repeated transmissions across different time units. Each repetition can be independently decoded by the terminal, increasing the probability of successful reception and thereby improving coverage without requiring complex modulation schemes
Solution Approach 2:
The patent implements periodic repeated transmissions of PDCCH at configured intervals. This periodic repetition allows terminals to accumulate signal energy over time and perform combining operations, enhancing coverage while maintaining relatively simple transmission structure through regular timing patterns
2Reliability
If repeated transmissions of PDCCH are implemented, then coverage is enhanced, but time resources are consumed
Solution Approach 1:
The base station pre-configures search space parameters including the number of repetitions and time unit patterns before actual PDCCH transmission. This preliminary configuration allows terminals to predict and prepare for repeated transmissions, reducing the need for extended blind detection periods and optimizing time resource utilization
Solution Approach 2:
The patent configures a specific number of repetitions based on terminal capability and channel conditions rather than always transmitting maximum repetitions. This partial action approach ensures sufficient coverage enhancement while avoiding excessive time resource consumption when fewer repetitions are adequate
3Reliability
If blind detection is performed on multiple candidate time units, then PDCCH detection reliability is improved, but detection complexity increases
Solution Approach 1:
The patent configures different search space parameters for different candidate time units, allowing terminals to focus blind detection efforts on specific time units with higher probability of containing PDCCH. This localized approach reduces the overall detection complexity compared to uniform detection across all possible time units while maintaining detection reliability
Data Source
AI summary
A method for transmitting a physical downlink control channel is performed by a base station, which in the transmission process of a physical downlink control channel, sends a search space configuration parameter of a terminal, the search space configuration parameter including a quantity of repeated transmissions; determines at least one candidate time unit corresponding to the quantity of repeated transmissions according to the search space configuration parameter; and transmits the PDCCH to the terminal on a target time unit in the at least one candidate time unit according to the quantity of repeated transmissions.