Cell-State-Aware DRX Timing for PDCCH Monitoring Power Saving
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently determining the active time of user terminals during discontinuous reception (DRX) due to the lack of consideration for the state of serving cells, leading to suboptimal power saving performance and potential signal missed detection.
Innovation Solution
A method for configuring a DRX group that takes into account the state of cells within the group, determining the active time based on cells not being in a specific state, and using timers to manage power consumption, including mechanisms for dynamic scheduling and signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal monitors PDCCH during the entire DRX cycle, then signal reception reliability is improved, but power consumption increases
Solution Approach 1:
The terminal adopts discontinuous reception (DRX) mechanism, periodically switching between active and sleep states. During active time, the terminal monitors PDCCH for signal reception; during sleep time, it stops monitoring to save power. This periodic action resolves the contradiction by making monitoring intermittent rather than continuous.
Solution Approach 2:
The terminal dynamically adjusts its monitoring behavior based on the active time configuration. The network configures active time parameters (drx-OnDurationTimer, drx-InactivityTimer, etc.), and the terminal adapts its PDCCH monitoring accordingly - monitoring during active time, sleeping during inactive time. This dynamic adjustment optimizes the balance between reliability and power consumption.
2Use of energy by moving object
If the terminal leaves active time early when all cells are in a specific state, then power saving is improved, but signal detection reliability deteriorates
Solution Approach 1:
The invention introduces cell-state-aware active time management. Different cells within the same DRX group can have different states (e.g., SCell activation state), and the terminal's monitoring behavior is adjusted based on the local state of each cell. This allows the terminal to optimize power saving for cells in a specific state while maintaining reliability for cells that require monitoring.
Solution Approach 2:
The network provides feedback about cell states to the terminal through RRC configuration and DCI signaling. The terminal uses this feedback to determine whether to continue or exit active time. This feedback mechanism ensures that the terminal makes informed decisions about active time extension, balancing power saving with the need to detect signals on cells that may transition out of the specific state.
3Reliability
If the terminal extends active time to cover all cells, then signal reception reliability is improved, but power consumption increases
Solution Approach 1:
The DRX configuration is segmented by cell state. The network configures different active time parameters for cells in different states (e.g., SCell deactivated vs. activated). The terminal applies different monitoring strategies to different cell groups, extending active time only when necessary for cells that require signal reception, while allowing earlier exit for cells in states where signals are not expected.
4Device complexity
If the system configures DRX without considering cell state, then configuration simplicity is maintained, but power saving performance deteriorates
Solution Approach 1:
The DRX configuration mechanism is enhanced to serve multiple functions: it not only manages general DRX operation but also adapts to cell-specific states (particularly SCell activation states). The same DRX configuration framework handles both traditional DRX timing and cell-state-dependent active time adjustment, avoiding the need for completely separate configuration systems while improving power saving.
Data Source
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AI summary
Disclosed in the present application are a method used for wireless communication and a device. The method comprises: receiving first signaling and second signaling, the first signaling being used for configuring a first DRX group, the first DRX group comprising a first cell set, and the second signaling being used for configuring a first state of at least one cell in the first cell set; and monitoring a PDCCH during the active time of the first DRX group, the active time of the first DRX group only comprising the time during which said at least one cell in the first cell set is not in the first state. The first signaling is used for configuring a first timer, and the operation period of the first timer is used for determining the active time of the first DRX group, the first timer only operating at the beginning of one DRX cycle. The present application can better save power by means of the indication of the first signaling and the second signaling.