Dual-DRX Timer Scheduling for Cross-Carrier Grant Monitoring
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Solution Overview
Problem
In cross-carrier scheduling scenarios with dual DRX configurations, UEs face inefficiencies in power consumption and monitoring due to mismatched inactivity timer durations across different sets of cells, leading to unnecessary power usage and potential missed scheduling opportunities.
Innovation Solution
Implementing a method where UEs maintain two distinct inactivity timers, one for each set of cells, and adjust the timer duration based on whether the scheduling is self-scheduling or cross-carrier scheduling, ensuring efficient monitoring of subsequent grants by aligning the timer duration with the scheduled cell's configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the UE uses a single inactivity timer duration for all cells, then the device complexity is reduced, but power consumption increases due to unnecessary monitoring and scheduling opportunities may be missed
Solution Approach 1:
The patent segments the inactivity timer configuration by creating separate timer values for different cell types (scheduling cell vs. scheduled cell). This segmentation allows the UE to apply appropriate timer durations based on the specific cell relationship, preventing unnecessary extended monitoring periods while ensuring sufficient coverage for actual scheduling opportunities, thereby reducing overall power consumption without requiring complex unified timer management
Solution Approach 2:
The patent applies local quality by assigning different inactivity timer durations based on the local characteristics of cell relationships. Specifically, when a scheduling cell schedules a scheduled cell, a first inactivity timer duration is applied; when self-scheduling occurs, a second inactivity timer duration is applied. This localized differentiation optimizes power consumption for each specific scheduling scenario without increasing overall device complexity
2Reliability
If the UE extends the monitoring period to ensure no scheduling opportunities are missed, then reliability improves, but power consumption increases due to unnecessary monitoring
Solution Approach 1:
The patent changes the inactivity timer parameter based on the scheduling scenario. By setting different timer durations (first duration for cross-carrier scheduling, second duration for self-scheduling), the system dynamically adjusts the monitoring period to match the actual scheduling behavior. This ensures reliable reception of scheduling opportunities while avoiding unnecessary extended monitoring that would waste power
3Use of energy by moving object
If the UE uses different inactivity timer durations for different cell sets, then power efficiency improves, but device complexity increases due to multiple timer management requirements
Solution Approach 1:
The patent implements dynamics by making the inactivity timer duration adaptive to the scheduling scenario. The UE dynamically selects between the first inactivity timer duration and the second inactivity timer duration based on whether the scheduling cell is different from or the same as the scheduled cell. This dynamic adaptation optimizes power consumption without requiring complex static timer management structures
Data Source
AI summary
A method is disclosed to operate a wireless device configured for communication with a wireless network using first and second sets of cells. The first set of cells is associated with a first inactivity timer duration, the second set of cells is associated with a second inactivity timer duration, and the first and second inactivity timer durations are different. A scheduling grant is received for a cell of the second set of cells using a cell of the first set of cells. Responsive to receiving the scheduling grant, the cell of the first set of cells is monitored for subsequent grants for the cell of the second set of cells for a period following the scheduling grant defined by the first inactivity timer duration or defined by the second inactivity timer duration. Related wireless devices are also discussed.