Adaptive SMTC Window Offsets for NTN SSB Measurement Timing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In 5G/NR communication systems, particularly in non-terrestrial networks (NTN), the varying propagation delay differences between serving and neighboring cells lead to challenges in accurately configuring the SS/PBCH block measurement timing configuration (SMTC), resulting in inadequate SSB detection and measurement by user equipment (UE).
Innovation Solution
User equipment (UE) adjusts SMTC windows and measurement gaps based on propagation delay differences using assistance information and location data to ensure accurate SSB measurements from neighboring cells, regardless of static configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If static SMTC configuration is used, then device complexity is reduced, but measurement precision deteriorates due to varying propagation delays in NTN
Solution Approach 1:
The patent applies dynamics by making the SMTC configuration adaptive rather than static. The network configures multiple SMTC windows with different offsets, and the UE dynamically selects the appropriate window based on measured propagation delay differences. This dynamic adaptation resolves the contradiction by allowing measurement precision to improve through delay compensation while keeping the configuration manageable through predefined options.
Solution Approach 2:
The patent changes the timing offset parameter of SMTC windows based on propagation delay conditions. By providing multiple SMTC window configurations with different offsets and enabling UE to select based on measured delay differences, the system adapts timing parameters to match actual propagation conditions, thereby improving SSB detection accuracy without requiring completely new configuration mechanisms.
2Adaptability or versatility
If multiple SMTC windows with different offsets are configured, then adaptability to varying propagation delays is improved, but device complexity increases
Solution Approach 1:
The patent implements partial action by providing a set of predefined SMTC window configurations with different offsets, but requiring the UE to only select and activate the one that matches its measured propagation delay condition. This approach achieves adaptability across multiple scenarios while keeping actual device operations simple, as the UE only needs to compare its measured delay against thresholds and select from predefined options rather than managing all configurations simultaneously.
3Measurement precision
If UE autonomously adjusts SMTC windows based on propagation delay, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent implements self-service by enabling the UE to autonomously measure propagation delay differences between serving and neighboring cells, compare these measurements against configured thresholds, and automatically select the appropriate SMTC window configuration. This self-service capability improves measurement precision through accurate delay compensation while maintaining ease of operation, as the UE performs these adjustments automatically without requiring manual intervention or complex user procedures.
Data Source
AI summary
Methods and apparatuses for adjustment of SMTC configuration in a wireless communication system. A method of a UE comprises: receiving system information including assistance information and an SMTC including offsets for one or more SMTC windows; acquiring location information of the UE; determine, based on the assistance information and the location information, a propagation delay difference between a serving cell of the UE and a neighboring cell; adjust, based on the propagation delay difference, the offsets for one or more SMTC windows; and measuring an SSB received from a neighboring cell within the adjusted one or more SMTC windows.