NTN Neighbor Cell Information Layout for Seamless UE Mobility
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Solution Overview
Problem
Existing wireless communication systems, particularly in non-terrestrial networks (NTN), face challenges in efficiently conveying system information for neighboring cells due to the unique characteristics of NTN platforms, such as high-gain narrow-beam directional antennas and predictable movement, which complicates the categorization and broadcasting of system information for seamless UE mobility.
Innovation Solution
The proposed solution involves categorizing neighboring cells into intra-platform and inter-platform cells in NTN systems, utilizing existing NR SIB structures with platform identifiers and differential information to minimize structural changes, and broadcasting platform-specific and cell-specific information efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If system information for neighboring cells is broadcast using existing NR SIB structures, then compatibility with existing NR standards is maintained, but the unique characteristics of NTN platforms (high-gain narrow-beam directional antennas, predictable movement) are not adequately addressed
Solution Approach 1:
The patent segments neighboring cells into two distinct categories: intra-platform cells (same NTN platform) and inter-platform cells (different NTN platforms). This segmentation allows tailored information broadcasting for each category, addressing NTN-specific characteristics without overhauling the entire SIB structure. The segmentation enables efficient resource allocation and mobility management by applying different information sets to different cell types.
Solution Approach 2:
The patent introduces dynamic parameters for NTN platforms including platform identifier, platform-specific downlink reference signal configuration, and differential information that can change as platforms move. This dynamic approach accommodates the predictable movement characteristics of NTN platforms while maintaining structured information delivery through the existing SIB framework.
2Reliability
If comprehensive system information is provided for all neighboring cells, then UE mobility is facilitated, but resource overhead increases
Solution Approach 1:
The patent extracts and separates platform-specific information from cell-specific information. By taking out the platform identifier and platform-specific downlink reference signal configuration as separate elements, the system avoids redundant broadcasting of identical information across all neighboring cells. This extraction reduces resource overhead while maintaining comprehensive mobility information where needed.
Solution Approach 2:
The patent applies partial information broadcasting by providing full system information only for intra-platform cells while using differential information for inter-platform cells. This partial action approach ensures reliable UE mobility within the same platform while reducing resource overhead for inter-platform transitions, applying exactly the right amount of information for each scenario.
3Measurement precision
If platform-specific information is included for all neighboring cells, then accurate mobility management is achieved, but information redundancy increases
Solution Approach 1:
The patent applies local quality by providing platform-specific information selectively based on the cell category. Intra-platform cells receive complete platform-specific downlink reference signal configuration information, while inter-platform cells receive differential information that references the serving platform's configuration. This local quality approach ensures measurement precision where needed while eliminating redundant information transmission.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive system information associated with a set of neighboring cells included in a non-terrestrial network (NTN). The UE may be connected to or camped in a current cell included in the NTN. The current cell may be associated with a current platform. The UE may monitor a neighboring cell, of the set of neighboring cells, based at least in part on the system information. Numerous other aspects are provided.