Synchronizing P-TAU Timing with eDRX Cycles
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Solution Overview
Problem
The Periodic Tracking Area Update (P-TAU) period and Discontinuous Reception (DRX) period in wireless communication systems are often misaligned, leading to increased power consumption in user equipment as they wake up frequently for both procedures, reducing device lifespan, especially in scenarios where P-TAU and Paging times differ.
Innovation Solution
A method to synchronize the P-TAU timing with the Extended Discontinuous Reception (eDRX) timing by adjusting the P-TAU period based on eDRX application timing, allowing user equipment to perform P-TAU and Paging procedures together, thereby reducing the frequency of awakenings and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the P-TAU period and DRX period are independently configured with different timing, then the user equipment can perform P-TAU and Paging procedures separately, but the user equipment must awake multiple times which increases power consumption
Solution Approach 1:
The patent combines the P-TAU procedure and Paging procedure into a single awakening event by aligning their timing. The P-TAU period is configured to be synchronized with the DRX period, allowing the user equipment to perform both procedures simultaneously during one wake-up, thereby reducing the number of awakenings and lowering power consumption
2Stability of the object's composition
If the P-TAU period is configured to be the same as the DRX period with different timing, then the procedures can be performed with consistent periodicity, but the user equipment still needs to awake twice causing increased power consumption
Solution Approach 1:
The patent merges the timing of P-TAU and Paging by configuring them to occur at the same time instances. This is achieved by setting the P-TAU period equal to the DRX period and aligning their starting points, so that both procedures are executed during the same awakening event, maintaining periodic consistency while reducing awakenings to once per cycle
Solution Approach 2:
The patent performs preliminary timing alignment configuration to ensure that P-TAU and Paging are scheduled to occur simultaneously. By pre-configuring the P-TAU period and timing to match the DRX parameters, the system prepares the scheduling in advance to avoid multiple awakenings
Data Source
AI summary
According to an aspect of the present invention, a method for adjusting a Periodic-Tracking Area Update (P-TAU) timing performed by a user equipment in a wireless communication system may include transmitting P-TAU support information indicating that an adjustment of the P-TAU timing is available to a Mobility Management Entity (MME) through an Attach request message or a TAU request message; receiving a request accept message with respect to the Attach request message or the TAU request message; and adjusting the P-TAU timing in accordance with an eDRX application timing based on the P-TAU timing adjustment condition information when the request accept message includes the −TAU timing adjustment condition information.