Fixed Tracking Areas for Satellite-Terrestrial Network Integration
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Solution Overview
Problem
Satellite-based communication systems face challenges in integrating with terrestrial wireless networks due to differences in coverage areas, movement, propagation delays, and carrier frequencies, necessitating optimized support for tracking areas to minimize impact on the core network.
Innovation Solution
Implementing fixed tracking areas (TAs) in satellite radio cells, where UE access is managed by broadcasting TA identities, and a core network node determines access permission based on these identities, using a method involving Radio Access Network (RAN) and core network nodes to facilitate satellite wireless access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If satellite-based communication systems integrate with terrestrial wireless networks, then ubiquitous outdoor coverage is achieved, but network complexity increases due to differences in coverage areas, movement, propagation delays, and carrier frequencies
Solution Approach 1:
The network is segmented into distinct satellite and terrestrial components, each managed independently. Satellite-specific parameters (coverage areas, propagation delays, frequencies) are handled separately from terrestrial network operations, allowing integration without overwhelming complexity
Solution Approach 2:
A satellite access network introduces itself to the core network as a terrestrial base station, acting as an intermediary that translates between satellite and terrestrial protocols. This mediator layer handles the complexity of satellite-specific parameters while presenting a standardized interface to the core network
2Device complexity
If satellite radio cells use fixed tracking areas, then core network impact is minimized, but tracking precision may be reduced due to satellite movement
Solution Approach 1:
The system uses dynamic tracking area updates where the RAN node determines the UE's current TA based on satellite position and provides this information to the core network. This dynamic approach maintains fixed TA structures for simplicity while adapting to satellite movement through periodic updates
Solution Approach 2:
The RAN node pre-calculates and determines the appropriate tracking area based on satellite ephemeris data and UE location before the UE needs to access the network. This preliminary determination ensures accurate tracking information is available when needed without real-time computational overhead
3Ease of operation
If TA identities are broadcast in satellite radio cells, then UE access management is simplified, but information overhead increases
Solution Approach 1:
TA identity information is broadcast locally in satellite radio cells only where needed for access management, rather than being propagated throughout the entire network. This localized approach simplifies UE access decisions while minimizing unnecessary information transmission across the network
Data Source
AI summary
Techniques are described for supporting satellite wireless access for a user equipment (UE) using fixed tracking areas (TAs). TA identities (TAIs) are broadcast in a satellite radio cell by a base station indicating which TAs are covered by the radio cell. A UE can access a radio cell if at least one broadcast TAI is not forbidden for the UE. A base station provides the TAIs broadcast in a radio cell and a TAI for a TA in which a UE is located to a core network node to support access by the UE. The core network node uses the broadcast TAIs to decide whether UE access is allowed and uses the broadcast TAIs and the TAI to assign a UE registration area. The UE may transfer all the broadcast TAIs to a forbidden TAI list if UE access is rejected by the core network node.