Dynamic PDCCH Candidate Adaptation for Low-Power Wireless Devices
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Solution Overview
Problem
The monitoring complexity of physical downlink control channels (PDCCH) in wireless communication systems, particularly in devices with low power operation, is high due to the need to continuously scan for control information, leading to increased power consumption and inefficiency.
Innovation Solution
Implementing dynamic configuration and adaptation of PDCCH candidates, where a base station explicitly indicates adjustments to user equipment (UE) through PDCCH messages, allowing the UE to autonomously adjust its monitoring based on algorithms or rules, synchronizing with the base station to optimize the number and aggregation levels of PDCCH candidates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE continuously monitors PDCCH candidates to receive control information, then the reliability of downlink control information reception is improved, but the power consumption and monitoring complexity increase
Solution Approach 1:
The patent implements dynamic PDCCH monitoring adaptation where the UE adjusts its monitoring behavior based on decoded DCI content. The monitoring configuration is changed from static to dynamic, allowing the UE to adaptively modify monitoring parameters such as the number of candidates and aggregation levels based on actual control information requirements, thereby reducing unnecessary power consumption while maintaining reliability
Solution Approach 2:
The patent changes monitoring parameters (number of PDCCH candidates, aggregation levels, monitoring occasions) dynamically based on decoded DCI messages. The base station signals parameter adjustments through DCI formats, and the UE modifies its monitoring configuration accordingly, transforming fixed parameters into adaptable ones that respond to actual communication needs, thus reducing power consumption while preserving reception reliability
2Reliability
If a UE monitors a large number of PDCCH candidates with high aggregation levels, then the reliability of control information reception is improved, but the monitoring complexity and processing load increase
Solution Approach 1:
The patent makes the PDCCH monitoring configuration dynamic by allowing the UE to adjust the number of monitored candidates and aggregation levels based on decoded DCI content. This dynamic adaptation reduces monitoring complexity by only maintaining high monitoring levels when actually needed for reliable reception, rather than continuously maintaining maximum monitoring complexity
Solution Approach 2:
The patent implements a feedback mechanism where the UE decodes DCI messages and uses the decoded information to determine subsequent monitoring parameters. The base station signals monitoring parameter adjustments through DCI, creating a closed-loop system where monitoring complexity is adjusted based on actual control information requirements, thereby reducing unnecessary processing load while maintaining reliability
3Adaptability or versatility
If the UE autonomously adjusts PDCCH monitoring parameters, then the adaptability and efficiency are improved, but the synchronization with the base station becomes more challenging
Solution Approach 1:
The patent establishes a feedback-based coordination mechanism where the base station signals monitoring parameter adjustments through DCI messages sent to the UE. The UE autonomously adapts its monitoring parameters based on these signals, and the base station applies the same adaptation rules to maintain synchronization. This feedback loop enables adaptability while preserving system consistency
Solution Approach 2:
The patent enables the UE to autonomously determine and adjust its PDCCH monitoring parameters based on decoded DCI content and predefined adaptation rules. The UE serves itself by making intelligent monitoring decisions without requiring explicit reconfiguration for each change, while the base station maintains synchronization by applying identical adaptation logic, thus achieving both autonomy and consistency
Data Source
AI summary
Methods, systems, and devices for configuring physical downlink control channel candidates are described. The method may include monitoring, by a UE, an initial set of physical downlink control channel candidates in a first slot, receiving, by the UE, an indication of an adjusted set of physical downlink control channel candidates to monitor in a second slot based on decoding a physical downlink control channel candidate in the initial set, and monitoring, by the UE in the second slot, the adjusted set of physical downlink control channel candidates. The method may also include adaptively (e.g., autonomously) determining, by the UE, the adjusted set of physical downlink control channel candidates, and corresponding determinations by the base station.