Radio Terminal DRX State Transition Management
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Solution Overview
Problem
Current 3GPP specifications lack clear state transition rules between extended DRX and conventional DRX states, leading to an indefinite relationship between the two, which affects power consumption and communication efficiency in radio terminals.
Innovation Solution
A radio terminal with a controller that transitions between DRX states (long and short) and extended DRX states based on thresholds for control signal reception, MAC control elements, and data transmission/reception, allowing for adaptive DRX cycle management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If extended DRX cycle is used to reduce power consumption, then power consumption is reduced, but the relationship and state transition rules between extended DRX and conventional DRX states become indefinite
Solution Approach 1:
The patent applies dynamics by making the DRX cycle length adaptable rather than fixed. The system dynamically transitions between conventional DRX states (short and long) and extended DRX state based on data activity detection. When data activity is detected, the terminal transitions from extended DRX to conventional DRX; when no data activity occurs, it transitions to extended DRX. This dynamic adaptation resolves the contradiction by allowing the system to optimize power consumption through extended DRX while maintaining clear, manageable state transition rules.
Solution Approach 2:
The patent changes the DRX cycle parameter from a fixed value to a variable that can take multiple values (short DRX cycle, long DRX cycle, and extended DRX cycle). The terminal can switch between these different parameter values based on network conditions and data activity. This parameter change approach allows the system to achieve lower power consumption through extended cycles while maintaining operational flexibility through defined transition rules between different parameter states.
2Use of energy by moving object
If extended DRX state is introduced, then power consumption is reduced, but the number of DRX states increases making state management more complex
Solution Approach 1:
The patent segments the DRX operation into distinct, well-defined states: short DRX state, long DRX state, and extended DRX state. Each state has specific characteristics and clear transition conditions. This segmentation approach manages the complexity by breaking down the overall DRX operation into manageable segments with explicit rules, rather than having a single complex extended DRX state. The segmentation maintains adaptability because the system can choose which state to enter based on conditions.
Solution Approach 2:
The patent implements feedback mechanisms where the terminal monitors data activity and uses this information to determine state transitions. The network also provides feedback through downlink control information to indicate whether the terminal should remain in extended DRX or transition to conventional DRX. This feedback loop simplifies state management by providing clear decision criteria, reducing the complexity that would otherwise arise from having multiple DRX states.
3Reliability
If clear state transition rules are established between extended DRX and conventional DRX, then system operation becomes more predictable, but the configuration complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the terminal with multiple DRX parameters (short DRX cycle, long DRX cycle, and extended DRX cycle) before operation begins. The network also pre-configures the conditions and rules for transitioning between these states. This preliminary configuration establishes predictable state transition behavior without requiring complex real-time decision-making, as the rules are predetermined and clearly defined in advance.
Data Source
AI summary
A base station comprises a transmitter configured to transmit, to a user terminal, information indicating at least any one of a first DRX cycle, a second DRX cycle, and a third DRX cycle. The DRX cycle indicates a cycle during which a user terminal discontinuously monitors a downlink control channel transmitted from a base station. The second DRX cycle has a cycle longer than the first DRX cycle. The third DRX cycle has a cycle longer than the second DRX cycle.