SMTC Parameter Adjustment for RTT Changes in LEO HAPS Networks
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Solution Overview
Problem
In 5G wireless telecommunication systems, changes in signal arrival times due to feeder link or inter-satellite link adjustments can cause synchronization signal block measurement failures, leading to handover failures and reduced network performance.
Innovation Solution
A method and apparatus for identifying link changes corresponding to round trip time (RTT) changes, transmitting indications of these changes to serving network entities, and adjusting synchronization signal block measurement time configuration (SMTC) parameters to maintain accurate signal measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feeder link or inter-satellite link adjustments are made to optimize signal transmission, then signal quality may improve, but signal arrival time changes cause synchronization signal block measurement failures
Solution Approach 1:
The network entity proactively identifies link changes and calculates RTT changes before they affect measurement accuracy. By transmitting indications of link changes and RTT changes in advance, the system allows user equipment to adjust SMTC parameters preemptively, ensuring measurements are not compromised when signal arrival times change
Solution Approach 2:
The system establishes a feedback loop where the network entity continuously monitors link status, identifies changes, and communicates RTT variations back to serving network entities. This feedback mechanism enables dynamic adjustment of measurement configurations to maintain accuracy despite changing propagation conditions
2Device complexity
If SMTC parameters are kept fixed for stable configuration, then device complexity is reduced, but measurement accuracy deteriorates when propagation delays vary
Solution Approach 1:
The system transitions from static SMTC parameters to dynamic parameters that automatically adapt to changing propagation conditions. When link changes are detected and RTT variations are communicated, the SMTC parameters are adjusted accordingly, allowing the configuration to remain simple while responding dynamically to environmental changes
Solution Approach 2:
The invention changes the state of SMTC parameters from fixed to variable based on propagation delay conditions. By receiving indications of RTT changes and adjusting parameters such as measurement timing offsets and window durations, the system maintains measurement accuracy without requiring complex manual reconfiguration
3Measurement precision
If link changes are monitored and communicated in real-time, then measurement accuracy is maintained, but network signaling overhead increases
Solution Approach 1:
The invention extracts only the essential information needed for measurement adjustment - specifically link change indications and RTT change values - and transmits them separately from full configuration messages. This selective transmission of critical parameters reduces signaling overhead while maintaining the ability to adjust measurements accurately
Data Source
AI summary
A method and apparatus may include identifying, by a network entity, at least one link change corresponding with at least one round trip time (RTT) change, and transmitting, by the network entity, at least one first indication of the at least one link change to at least one serving network entity. The at least one first indication is configured to cause the at least one serving network entity to transmit at least one second indication of the at least one RTT change to at least one user equipment.