PDCCH Skipping During CDRX for Lower UE Power Use
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Solution Overview
Problem
Existing wireless communication technologies face challenges in reducing power consumption of user equipment (UE) during Connected Mode Discontinuous Reception (CDRX) operations, particularly in extended reality (XR) services, due to the need to monitor physical downlink control channels (PDCCH) frequently, which leads to increased power consumption.
Innovation Solution
Implementing PDCCH skipping techniques, where the UE refrains from monitoring the PDCCH during designated intervals aligned with DRX retransmission timers, allowing for extended sleep states and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE monitors the PDCCH continuously during CDRX operation, then the reliability of receiving control information is improved, but the power consumption increases
Solution Approach 1:
The patent implements periodic PDCCH monitoring during CDRX operation by defining specific monitoring periods (e.g., every N slots) rather than continuous monitoring. The UE monitors PDCCH only during designated active periods and skips monitoring during sleep periods, achieving periodic action that reduces power consumption while maintaining necessary reliability for receiving control information at critical intervals.
Solution Approach 2:
The patent applies PDCCH skipping by allowing the UE to skip monitoring during specific time intervals (PDCCH skip intervals) when no downlink data is expected. This skipping mechanism enables the UE to transition to low-power state during these intervals, significantly reducing power consumption while the network ensures reliability by scheduling control information only during monitored periods.
2Use of energy by moving object
If the UE enters sleep state during CDRX operation, then the power consumption is reduced, but the ability to receive timely control information deteriorates
Solution Approach 1:
The patent applies preliminary action by having the UE wake up from sleep state in advance before actual data transmission occurs. The UE monitors PDCCH during predetermined active periods to receive control information before the sleep state would cause missed transmissions. This advance wake-up and monitoring ensures the UE is ready to receive control information timely while still benefiting from power savings during sleep intervals.
Solution Approach 2:
The patent implements feedback mechanisms where the network provides downlink control information through PDCCH during active periods, and the UE uses this feedback to determine when to wake up and when can safely remain in sleep state. The feedback loop ensures reliable communication by allowing the UE to adjust its monitoring behavior based on network scheduling, maintaining the ability to receive control information while maximizing power savings.
3Use of energy by moving object
If the UE skips PDCCH monitoring during DRX retransmission timer interval, then the sleep duration is extended and power consumption decreases, but the complexity of timing management increases
Solution Approach 1:
The patent merges multiple timing functions into a unified approach by combining the DRX retransmission timer interval with PDCCH skip interval determination. Instead of independently managing separate timing mechanisms, the UE uses the DRX retransmission timer to automatically define when PDCCH skipping should occur, merging power saving timing with data retransmission timing management. This integration reduces overall system complexity while achieving extended sleep durations.
Solution Approach 2:
The patent applies self-service by enabling the UE to autonomously determine PDCCH skip intervals based on its own DRX configuration and timer states without requiring additional network signaling. The UE uses its internal DRX retransmission timer to automatically identify suitable skip intervals, making the timing management self-managed and reducing the complexity of coordinating multiple timing parameters across UE and network.
Data Source
AI summary
Disclosed are methods, systems, and computer-readable medium to perform operations including: determining a first configured grant (CG) opportunity during a first Connected Mode Discontinuous Reception (CDRX) ON duration; transmitting data during the first CG opportunity; determining a Physical Downlink Control Channel (PDCCH) skip interval, where a beginning of the PDCCH skip interval corresponds to a start of a DRX-retransmission timer subsequent to the first CDRX ON duration, and where an end of the PDCCH skip interval corresponds to at least one of: a beginning of a second CG opportunity, or a beginning of a second CDRX ON duration; and refraining from monitoring the PDCCH during the PDCCH skip interval.