LTE Access Retry Timing Based on Mobile Terminal Speed
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Mobile terminals experience low efficiency in accessing LTE networks due to continuous failure to attach or perform tracking area updates, leading to prolonged T3402 timer activation and disabling of E-UTRA capability, which prevents immediate re-access even when moving into better network conditions.
Innovation Solution
Adjust the duration of the T3402 timer based on the mobile terminal's moving speed, allowing quicker re-access to the LTE network by disabling E-UTRA capability when a threshold of attach or TAU failures is reached, enabling re-attempting access upon expiration of the adjusted timer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile terminal uses the default T3402 timer duration of 12 minutes after attach or TAU failures, then the network access reliability is improved by preventing continuous failed attempts, but the network access speed deteriorates because the terminal cannot re-access even when moving into better coverage areas
Solution Approach 1:
The patent applies dynamics by making the T3402 timer duration adjustable rather than fixed. The terminal determines its moving speed and selects different timer durations (first duration for high speed, second duration for low speed) based on movement state. This dynamic adjustment allows the system to balance reliability and speed: when moving fast, the terminal can quickly reach better coverage areas so a shorter timer is appropriate, while when stationary, a longer timer prevents continuous failed attempts.
2Speed
If the mobile terminal continuously attempts to access the network despite failures, then the network access speed is improved by immediate re-attempt, but the network access reliability deteriorates due to continuous failures consuming resources and causing interference
Solution Approach 1:
The patent applies parameter changes by modifying the T3402 timer duration parameter based on the terminal's moving speed. Instead of continuously attempting access with a fixed timer, the terminal changes the timer parameter to match its movement state. This parameter adjustment resolves the contradiction by ensuring that when the terminal is moving (likely entering better coverage), the timer is shortened to enable faster re-access, while when stationary, the timer is lengthened to prevent resource waste from continuous failed attempts.
3Productivity
If the T3402 timer duration is reduced for mobile terminals moving at high speed, then the network access efficiency is improved by allowing quicker re-access to LTE network, but the device complexity increases due to the need to detect and respond to moving speed changes
Solution Approach 1:
The patent applies self-service by enabling the mobile terminal to autonomously detect its own moving speed and automatically adjust the T3402 timer duration without external network intervention. The terminal uses its built-in sensors and processing capabilities to determine movement state and select appropriate timer values. This self-service approach improves network access efficiency for moving terminals while avoiding the need for complex network-side detection and control mechanisms, thus limiting the increase in overall system complexity.
Data Source
AI summary
In a method, when a quantity of attach failures or TAU failures reaches a threshold, a mobile terminal starts a T3402 timer and disables an E-UTRA capability, and attempts to access the LTE network again after the T3402 timer expires. Duration of the T3402 timer is determined by a moving speed of the mobile terminal. When the moving speed reaches a first value, a value of the T3402 timer is less than a default duration. After the T3402 timer expires, the mobile terminal searches for the LTE network again, and sends an attach request to a network device of the LTE network.