SSB Measurement Time Configuration for NTN Timing Offset
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Solution Overview
Problem
In communication networks, especially in satellite-based Non-Terrestrial Networks (NTN), the propagation delay caused by moving base stations or satellites leads to timing offsets in Synchronization Signal Block (SSB) measurements, resulting in incomplete measurement of SSB and interference in measurement results.
Innovation Solution
A method and apparatus are provided to enhance SSB Measurement Time Configuration (SMTC) by determining a first configuration for SSB measurement time and a second configuration for indicating an offset related to the SSB measurement time, and transmitting these configurations to wireless devices to adjust their SSB measurement accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a terminal device measures SSB in a predetermined measurement time window, then the measurement process is simple and fast, but propagation delay from moving base stations or satellites causes timing offsets that result in incomplete SSB measurement and interference in measurement results
Solution Approach 1:
The patent applies dynamics by making the measurement time window configurable and adaptable rather than fixed. The network node dynamically adjusts the measurement time window parameters (duration, periodicity, offset) based on propagation delay characteristics of moving base stations or satellites, allowing the system to adapt to changing timing conditions while maintaining measurement accuracy
Solution Approach 2:
The patent changes key parameters of the measurement time window including duration, periodicity, and time offset. By adjusting these parameters based on propagation delay measurements, the system optimizes the measurement window to capture complete SSB signals from moving transmitters, thereby resolving the timing offset problem without sacrificing measurement speed
2Measurement precision
If the SSB measurement time window is extended to capture complete SSB signals, then measurement accuracy improves, but the measurement time and system complexity increase
Solution Approach 1:
The patent implements feedback mechanisms where the network node receives measurement results from terminal devices and uses this information to adjust measurement time window parameters. This closed-loop feedback system allows the network to optimize measurement window duration and timing based on actual propagation delay conditions, achieving high measurement accuracy without requiring overly complex fixed configurations
Solution Approach 2:
The network node performs preliminary actions by pre-configuring measurement time window parameters based on expected propagation delay characteristics before terminal devices begin measurements. This preliminary configuration reduces the complexity of real-time adjustments while ensuring measurement windows are appropriately sized to capture complete SSB signals
Data Source
AI summary
Embodiments of the present disclosure provide methods and apparatuses for enhancing SMTC in communication network. A method (100) performed by a network node may comprise: determining (S102) a first configuration for a synchronization signal block, SSB, measurement time; determining (S104) a second configuration for indicating an offset related to the SSB measurement time; and transmitting (S106) the first configuration and the second configuration to a wireless device, for indicating that the wireless device performs a SSB measurement, based at least on the first configuration and/or the second configuration. SSB refers to a combination of synchronization signal and physical broadcast channel. A method (200) performed by a wireless device may comprise: receiving (S202), a first configuration and a second configuration from a network node in a communication network; and performing (S204) a SSB measurement, based at least on the first configuration and/or the second configuration. The first configuration is for a SSB measurement time, and the second configuration is for indicating an offset related to the SSB measurement time. According to embodiments of the present disclosure, an offset related to the SSB measurement time may be indicated.