Uplink Synchronization Using Time of Arrival Values
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In high-speed and dynamic wireless communication scenarios, existing timing advance (TA) correction mechanisms struggle to maintain uplink synchronization due to rapid changes in relative speeds and positions of base stations and user equipment, leading to inefficiencies and potential loss of network access.
Innovation Solution
The method employs time of arrival (TOA) based timing advance values for uplink channel synchronization, allowing user equipment to autonomously determine and apply timing adjustments based on signal propagation delays, eliminating the need for frequent downlink radio resources and positioning reports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional timing advance correction mechanisms are used, then uplink synchronization can be maintained in static or low-speed scenarios, but synchronization accuracy deteriorates in high-speed and dynamic scenarios due to rapid changes in relative positions and speeds
Solution Approach 1:
The patent changes the fundamental parameter for timing advance calculation from network-estimated values to UE-measured TOA values. The UE autonomously measures the time of arrival of downlink signals and calculates timing advance based on these direct measurements, adapting to rapid changes in relative position and speed. This parameter change enables accurate synchronization maintenance in high-speed scenarios where traditional mechanisms fail.
2Measurement precision
If frequent downlink radio resources and positioning reports are used for TA correction, then uplink synchronization accuracy improves, but signaling overhead and system complexity increase
Solution Approach 1:
The patent implements self-service by enabling the UE to autonomously measure TOA of downlink signals and calculate its own timing advance values without requiring frequent network intervention. The UE independently determines uplink transmission timing based on its measurements, eliminating the need for continuous downlink TA correction resources and positioning reports, thus reducing signaling overhead while maintaining synchronization accuracy.
3Reliability
If traditional TA correction mechanisms are used, then network control over timing is maintained, but uplink synchronization latency increases in dynamic scenarios
Solution Approach 1:
The patent applies preliminary action by having the UE pre-measure TOA values and calculate timing advance corrections based on its own observations rather than waiting for network-triggered corrections. This allows the UE to proactively adjust its uplink timing in response to detected changes in relative motion, reducing synchronization latency while the network maintains oversight through validation of UE-reported TOA values.
Data Source
AI summary
A method, apparatus, and a computer-readable storage medium are provided for using time of arrival (TOA) based TTOAVAL or TTOA value for uplink to downlink channel synchronization at a user equipment (UE) required for required for establishing an RRC connection and/or maintaining the RRC connection due to UE mobility. In an example implementation, the method may include determining, by a user equipment (UE), a first time of arrival (TOA) based timing advance index value; and performing, by the user equipment (UE), uplink channel synchronization based at least on the first time of arrival (TOA) based timing advance index value.