NTN UE Measurement Configuration for Timing Offset Management
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Solution Overview
Problem
Next-generation wireless networks, particularly non-terrestrial networks, face complexities due to increased diversity and number of communication devices, leading to challenges in measurement accuracy and timing differences caused by large propagation delays between serving and neighbor cells.
Innovation Solution
Implementing multiple Signaling System/Physical Broadcast Channel (SS/PBCH) Block Measurement Timing Configurations (SMTCs) with different offsets and periodicities to allow UEs to correctly measure reference signals from serving and neighbor cells, even when they are not simultaneously transmitting/receiving, by configuring measurement gaps and scheduling restrictions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs measure reference signals from serving and neighbor cells in non-terrestrial networks, then mobility management is enabled, but large propagation delays cause timing differences that lead to measurement failures
Solution Approach 1:
The patent divides the measurement timing configuration into multiple separate SMTC objects, each with its own timing parameters (offset, periodicity, duration). This segmentation allows the UE to measure different neighbor cell groups with different timing characteristics independently, resolving the contradiction by enabling reliable measurements despite varying propagation delays across different cell directions.
Solution Approach 2:
The patent introduces dynamic timing adjustment mechanisms where SMTC parameters can be configured differently for different neighbor cell groups based on their specific propagation delay characteristics. This dynamic configuration allows the system to adapt measurement timing to the actual propagation conditions, maintaining measurement accuracy while ensuring reliability in high-latency NTN environments.
2Adaptability or versatility
If multiple neighbor cells are measured simultaneously, then comprehensive mobility information is obtained, but timing differences due to propagation delays cause measurement failures
Solution Approach 1:
The patent segments neighbor cells into different groups, each with dedicated SMTC configurations. This allows comprehensive mobility information to be gathered across multiple groups while each group is measured with timing optimized for its specific propagation characteristics, preventing measurement failures due to timing conflicts.
Solution Approach 2:
The patent adds a temporal dimension to measurement organization by introducing multiple SMTC objects with different time offsets and periodicities. This dimensional expansion allows the system to handle multiple neighbor cells with different propagation delays by measuring them at appropriately spaced time intervals, maintaining both versatility and precision.
3Measurement precision
If measurement gaps are configured for NTN UEs, then measurement accuracy is improved, but network complexity increases due to additional configuration parameters
Solution Approach 1:
The patent creates a universal SMTC configuration framework that handles both terrestrial and non-terrestrial networks through the same basic mechanism. While NTN requires additional parameters like longer durations and specific offsets, the fundamental SMTC structure remains universal, managing complexity by reusing existing measurement gap and timing configuration mechanisms rather than creating entirely separate systems.
Data Source
AI summary
An apparatus and system of enabling reference signal measurements in a non-terrestrial network (NTN) system are described. The UE provides capability information that indicates a maximum number of synchronization signal block (SSB)-based measurement timing configurations (SMTCs) simultaneously supported by the UE for measurement of reference signals from cells in the NTN system and receives SMTCs based on the capability information and a real time estimate of timing differences among the cells. The UE sends/receives data based on the SMTCs and whether the UE supports simultaneous data communication and measurement. Broadcast system information contains a flag that indicates which of dynamic and semi-static configuration is used, the maximum SMTC's dependent on the flag value. Radio resource control (RRC) signalling is used to send sets of SMTCs that have different offsets. Different sets are activated using dynamic signaling according to real time estimates of the timing differences.