NTN Terminal Timing Advance Reporting Mechanism
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Solution Overview
Problem
In Non Terrestrial Networks (NTNs), the existing mechanisms for Timing Advance (TA) reporting by User Equipment (UE) are inadequate, particularly in determining when to trigger TA reporting based on variations in TA values, leading to inefficiencies in maintaining uplink synchronization due to large propagation delays.
Innovation Solution
A method where a terminal device in an NTN triggers TA reporting upon receiving a TA reporting event or function configuration/reconfiguration message from a network device, allowing for event-based or periodic reporting, thereby addressing the inefficiencies in existing TA reporting mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If event-triggering TA reporting mechanism is used, then TA reporting is triggered based on TA value variation exceeding a threshold, but the triggering condition and timing are not clearly defined
Solution Approach 1:
The patent changes the parameter from continuous TA value monitoring to discrete event-based triggering. By defining specific triggering conditions (TA value variation exceeding a threshold) and associated timing relationships (K_offset), the system transforms an ambiguous continuous monitoring process into a clearly defined discrete event mechanism, resolving the contradiction between reliability and ease of operation.
2Reliability
If TA reporting is triggered based on TA value variation, then uplink synchronization is maintained, but the scheduling complexity increases due to uncertain reporting timing
Solution Approach 1:
The patent applies preliminary action by pre-configuring the K_offset parameter that defines the timing relationship between TA value determination and reporting. This allows the network to prepare scheduling resources in advance based on known timing relationships, reducing scheduling complexity while maintaining synchronization reliability through event-triggered reporting.
3Measurement precision
If frequent TA reporting is performed, then uplink synchronization accuracy is improved, but signaling overhead and network resource consumption increase
Solution Approach 1:
The patent implements periodic action through event-triggered TA reporting where reporting occurs only when specific conditions are met (TA value variation exceeds threshold). This transforms continuous frequent reporting into conditional periodic reporting, maintaining synchronization accuracy by reporting when changes occur while reducing signaling overhead by avoiding redundant reports during stable conditions.
Data Source
AI summary
A method of a terminal device reporting a Timing Advance TA in a Non Terrestrial Network NTN, a terminal device, and a network device are provided. The method includes triggering TA reporting, by the terminal device, in response to the terminal device in a Radio Access Control RRC connection state receiving a TA reporting event configuration/reconfiguration message from a network device, or receiving a TA reporting function configuration/reconfiguration message from the network device.