PDCCH Overlap Handling for Large Subcarrier Spacing
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Solution Overview
Problem
Current wireless communication systems, particularly in New Radio (NR) and LTE technologies, face challenges in efficiently managing control channel overlaps due to large subcarrier spacing, which leads to beam switching delays and resource allocation inefficiencies.
Innovation Solution
The implementation of a method to detect soft overlap conditions between physical downlink control channel (PDCCH) monitoring occasions and apply prioritization rules to determine which occasions to monitor, incorporating a threshold value for determining beam switching gaps and optimizing resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam switching is performed between PDCCH monitoring occasions with large subcarrier spacing, then coverage and connectivity are maintained, but beam switching delays increase and resource allocation efficiency decreases
Solution Approach 1:
The patent applies partial action by introducing a soft overlap threshold that allows monitoring of only some PDCCH monitoring occasions when overlap is detected. Instead of monitoring all occasions (excessive action) or none (insufficient action), the system selectively monitors based on whether the time distance exceeds the threshold, achieving partial monitoring that balances reliability and timing efficiency
Solution Approach 2:
The patent changes the parameter of monitoring behavior based on the time distance parameter between PDCCH monitoring occasions. By dynamically adjusting whether to monitor based on the threshold comparison, the system adapts its operation to resolve the contradiction between maintaining coverage (monitoring) and reducing delays (skipping monitoring when appropriate)
2Reliability
If beam switching is performed between PDCCH monitoring occasions with large subcarrier spacing, then coverage and connectivity are maintained, but resource allocation efficiency decreases
Solution Approach 1:
The patent applies partial action by introducing a soft overlap threshold that allows monitoring of only some PDCCH monitoring occasions when overlap is detected. Instead of monitoring all occasions (excessive action) or none (insufficient action), the system selectively monitors based on whether the time distance exceeds the threshold, achieving partial monitoring that balances reliability and timing efficiency
Solution Approach 2:
The patent changes the parameter of monitoring behavior based on the time distance parameter between PDCCH monitoring occasions. By dynamically adjusting whether to monitor based on the threshold comparison, the system adapts its operation to resolve the contradiction between maintaining coverage (monitoring) and reducing delays (skipping monitoring when appropriate)
3Loss of information
If all PDCCH monitoring occasions are monitored without overlap handling, then no control information is missed, but beam switching delays and processing complexity increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring the soft overlap threshold value before PDCCH monitoring occurs. This threshold is determined in advance based on system parameters like subcarrier spacing, and is stored for later comparison when monitoring occasions are evaluated, avoiding complex real-time calculations and reducing processing complexity
Solution Approach 2:
The patent applies partial action by introducing a soft overlap threshold that allows monitoring of only some PDCCH monitoring occasions when overlap is detected. Instead of monitoring all occasions (excessive action) or none (insufficient action), the system selectively monitors based on whether the time distance exceeds the threshold, achieving partial monitoring that balances reliability and timing efficiency
Data Source
AI summary
Aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for applying a beam switch interruption time across one or more active component carriers. In some cases a UE may be able to detect an actual overlap condition in which two physical downlink control channels (PDCCHs) monitoring occasions with different beam parameters overlap in time or a soft overlap condition in which a distance between the two PDCCH monitoring occasions in time is less than a threshold value; and to apply a prioritization rule to determine which of the PDCCH monitoring occasions to monitor for PDCCHs in response to detect the actual overlap or a soft overlap (e.g., almost immediately in contact in time or the gap is very small compared to the slot size).