5G NR Secondary Cell Dormant State Management
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Solution Overview
Problem
The current 5G New Radio (NR) system lacks a dormant state for Secondary Cells (Scells), which is necessary for rapid recovery and efficient resource management, leading to increased activation delays and reduced efficiency in carrier aggregation scenarios.
Innovation Solution
Introduce a cell state management method that configures Scells to have an active state with dormancy or non-dormancy behavior, allowing for the selection of dormant or active BWP configurations through RRC signaling, enabling faster state transitions and resource optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a dormant state mechanism similar to LTE is introduced in NR to achieve rapid Scell recovery, then cell recovery speed is improved, but the mechanism becomes more complicated and introduces long time delay
Solution Approach 1:
The patent changes the state parameters of the Scell by introducing two active states (dormant and non-dormant) instead of traditional active and inactive states. This parameter change allows the cell to maintain activity while adjusting resource usage, achieving fast recovery without the complexity and delay of traditional dormant state mechanisms.
Solution Approach 2:
The patent makes the Scell state dynamic by allowing transitions between dormant and non-dormant active states based on traffic conditions. This dynamic state management enables the system to adapt quickly to changing requirements without the rigid state transitions that cause delay in traditional mechanisms.
2Device complexity
If traditional active and inactive states are used for Scell in NR, then the mechanism is simpler, but activation delays increase and resource management efficiency decreases
Solution Approach 1:
The patent applies preliminary action by maintaining the Scell in an active dormant state where basic monitoring is performed in advance. This preliminary monitoring prepares the cell for rapid activation when needed, reducing activation delay while keeping the mechanism relatively simple compared to full dormant state implementations.
Data Source
AI summary
The embodiments of the present disclosure provide a cell state management method and an apparatus, a terminal device, and a network device. The method includes receiving, by a terminal device, first configuration information sent by a network device, where the first configuration information is used to indicate whether a state of a first cell is a first state or a second state, the first state represents an active state with a dormancy behavior, and the second state represents an active state with a non-dormancy behavior.