Speed-Based UE Uplink Timing Adjustment Above 120 km/h
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Solution Overview
Problem
Existing timing adjustment rules for User Equipment (UE) are inadequate for speeds exceeding 120 km/h, leading to communication delays or failures due to inaccuracies in uplink transmission timing.
Innovation Solution
A method for timing adjustment that involves obtaining information from a network device, determining a timing adjustment scheme based on UE type or speed, and adjusting uplink transmission timing accordingly, using either a first scheme with smaller adjustments for low speeds or a second scheme with larger adjustments for high speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed timing adjustment rule is used for all UEs, then the system is simple to implement, but timing accuracy deteriorates for high-speed UEs exceeding 120 km/h
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed timing adjustment rule to a dynamic rule that adapts based on UE speed. The network device determines whether to apply a first timing adjustment rule or a second timing adjustment rule based on the UE's speed relative to a threshold, allowing the system to respond to changing conditions and maintain timing accuracy for high-speed UEs while keeping the system manageable.
Solution Approach 2:
The patent changes the parameter of timing adjustment rules based on UE speed. By introducing a speed threshold parameter, the system switches between different timing adjustment rules (first rule for low-speed UEs, second rule for high-speed UEs), thereby adapting the timing mechanism to the specific operational conditions of each UE and resolving the contradiction between simplicity and precision.
2Reliability
If a timing adjustment rule optimized for low speeds is used, then timing accuracy is maintained for slow UEs, but communication failures occur for high-speed UEs
Solution Approach 1:
The patent applies local quality by tailoring different timing adjustment rules to different UE speed categories. Instead of using a single universal rule, the system implements a first timing adjustment rule for low-speed UEs (ensuring reliability) and a second timing adjustment rule for high-speed UEs (ensuring adaptability), allowing each local group of UEs to receive optimized timing handling based on their specific speed characteristics.
Solution Approach 2:
The system dynamically selects which timing adjustment rule to apply based on real-time speed measurement of the UE. This dynamic adaptation ensures that low-speed UEs continue to benefit from the first rule (maintaining communication reliability) while high-speed UEs switch to the second rule (improving adaptability), thus resolving the contradiction between reliability for slow UEs and adaptability for fast UEs.
3Device complexity
If a timing adjustment rule designed for speeds under 120 km/h is applied to high-speed UEs, then the rule remains simple, but timing error exceeds the acceptable threshold
Solution Approach 1:
The patent makes the timing adjustment rule dynamic by introducing speed-based conditionality. The network device measures UE speed and dynamically determines which rule to apply: the first timing adjustment rule for UEs under 120 km/h (maintaining simplicity) and the second timing adjustment rule for UEs exceeding 120 km/h (improving precision), thereby resolving the contradiction between rule simplicity and timing precision for high-speed scenarios.
Solution Approach 2:
The system changes the timing adjustment parameters based on the UE speed parameter. By using speed as a threshold parameter to switch between different adjustment rules, the system maintains simple rules for low-speed operation while implementing more precise adjustments for high-speed operation, thus resolving the contradiction between rule simplicity and timing precision without requiring a completely complex unified rule.
Data Source
AI summary
A method for timing adjustment, performed by a user equipment (UE), includes: obtaining information sent by a network device; determining a timing adjustment scheme based on the information; and adjusting an uplink transmission timing of the UE based on the timing adjustment scheme.