DRX Timer Management for Wireless State Transitions
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Solution Overview
Problem
The existing DRX operation in wireless communications systems does not effectively stop timer T319 when a UE transitions from the CELL_PCH state to the CELL_FACH state due to uplink data transmission, leading to potential system malfunctions due to imperfect error protection.
Innovation Solution
A method that stops timer T319 when a UE with a dedicated HS-DSCH Radio Network Temporary Identifier moves from the CELL_PCH state to the CELL_FACH state due to uplink data transmission, and initiates a second DRX cycle based on a different coefficient upon expiration, ensuring timely termination of the first DRX cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the timer T319 is only stopped when the UE initiates cell update procedure or URA update procedure, then the DRX operation can be simplified, but the timer may not be stopped timely when the UE leaves CELL_PCH or URA_PCH state through other paths, causing system malfunction
Solution Approach 1:
The patent introduces a feedback mechanism where the UE monitors its own state transitions and provides feedback by stopping the timer T319 whenever it leaves CELL_PCH or URA_PCH state through any path. This self-monitoring and self-correction mechanism ensures the timer is always stopped timely, preventing system malfunctions while maintaining operational simplicity.
Solution Approach 2:
The patent applies preliminary action by stopping the timer T319 at the moment the UE leaves CELL_PCH or URA_PCH state, rather than waiting for subsequent procedures. This proactive approach ensures the timer is stopped before any potential system malfunction can occur, regardless of the transition path taken.
2Use of energy by moving object
If the UE uses DRX operation to restrict downlink reception times, then power consumption is reduced, but the timer T319 may continue running after state transition, causing incorrect DRX cycle application
Solution Approach 1:
The patent implements a feedback mechanism where the UE continuously monitors its RRC state and provides feedback by stopping the timer T319 immediately upon leaving CELL_PCH or URA_PCH state. This ensures the DRX operation parameters are correctly updated without delay, maintaining both low power consumption and operational reliability.
Solution Approach 2:
The patent applies preliminary action by stopping the timer T319 at the exact moment of state transition, before the UE applies new DRX parameters. This prevents incorrect DRX cycle application and ensures seamless transition between different DRX configurations, maintaining both energy efficiency and reliability.
3Productivity
If the UE transitions from CELL_PCH to CELL_FACH state due to uplink data transmission without cell update procedure, then transmission efficiency is improved, but the timer T319 is not stopped, leading to potential system malfunction
Solution Approach 1:
The patent introduces a comprehensive feedback mechanism that monitors all state transition paths, including direct transitions from CELL_PCH to CELL_FACH state. When such a transition is detected, the UE immediately stops the timer T319, ensuring system reliability is maintained even when transmission efficiency is optimized through direct state transitions.
Solution Approach 2:
The patent applies preliminary action by stopping the timer T319 at the moment of state transition to CELL_FACH state, before any potential system malfunction can occur. This ensures that even efficient direct state transitions do not compromise system reliability.
Data Source
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AI summary
In order to avoid system malfunction, the present invention provides a method for improving Discontinuous Downlink Reception (DRX) operation for a user equipment (UE) in a wireless communications system. The method includes stopping a timer when the UE includes a dedicated HS-DSCH Radio Network Temporary Identifier (H-RNTI) and moves from a CELL_PCH state to a CELL_FACH state due to a uplink data transmission, wherein the timer is started when the UE enters the CELL_PCH state and is utilized for determining a time length for using a first DRX cycle (302).