Satellite Beam Area Signaling for Reliable NTN Handover
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Solution Overview
Problem
User equipment in non-terrestrial networks, such as satellite systems, face challenges in performing cell handovers between different regions or areas due to large cell coverage areas and shared PCIs, leading to refused connections and interference issues, especially for drones with varying flight characteristics.
Innovation Solution
A communication method and apparatus that provides first information and signals to user equipment for determining service and coverage areas, allowing operations like satellite handover, cell handover, and synchronization, by differentiating between beams and satellites using synchronization signals and configuration information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the same PCI is used for beams within one satellite coverage, then resource sharing is simplified, but UE cannot distinguish coverage boundaries and cell handover fails
Solution Approach 1:
The patent segments the coverage area identification by introducing area information that divides the large satellite coverage into distinguishable regions. This allows the same PCI to be reused across different segments (areas) while enabling UE to identify which segment it is in, thus maintaining resource sharing efficiency while enabling proper handover decisions.
Solution Approach 2:
The patent introduces area information as an intermediary element between the PCI and the coverage boundary identification. This intermediary carries additional spatial context without changing the PCI structure, allowing UE to distinguish coverage boundaries while maintaining the simplicity of PCI-based resource sharing.
2Ease of operation
If conventional measurement and reporting based on PCI is used, then the system is simple to operate, but cell handover cannot be achieved across multiple regions
Solution Approach 1:
The patent merges the conventional PCI-based measurement approach with area information to create a hybrid identification mechanism. UE continues to use simple RSRP/RSRQ measurements based on PCI but enhances this with area information to make informed handover decisions across regional boundaries, maintaining operational simplicity while achieving reliable handover.
3Adaptability or versatility
If drones use conventional physical cell modes, then all UEs share the same resources, but drones experience significant interference and service degradation
Solution Approach 1:
The patent applies local quality by allowing different area information configurations for different spatial locations. Drones operating in specific areas can be assigned area information that differentiates their service region from ground UEs, enabling localized resource allocation and reducing interference while maintaining overall system adaptability.
4Extent of automation
If fast-moving drones or drones during takeoff/landing use conventional handover procedures, then the system maintains standard protocols, but service performance deteriorates due to frequent handovers and signaling overhead
Solution Approach 1:
The patent enables preliminary action by providing area information in advance to UE, particularly beneficial for fast-moving drones. This allows drones to pre-identify upcoming coverage areas and plan handovers more efficiently, reducing the frequency and overhead of actual handover executions while maintaining automated protocol operation.
Data Source
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AI summary
This disclosure provides a communication method and apparatus, user equipment, and network device. The method includes: obtaining first information and/or a first signal sent by a network device, the first information and/or the first signal being used for indicating a service area and/or a coverage area provided by a first target object, and/or, the first information being used for indicating a relevant operation to be performed; and performing the relevant operation according to the first information and/or the first signal; the relevant operation includes one or more of satellite handover, cell handover, roaming request, beam switching, and uplink/downlink synchronization.