Satellite Mode Switching for Intermittent Feeder Link Availability
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Solution Overview
Problem
Satellite network entities in non-terrestrial networks experience intermittent connectivity due to Earth's rotation and satellite movement, leading to inefficiencies in communication modes and resource overheads in system information updates.
Innovation Solution
Implement signaling mechanisms for user equipment (UE) and satellite network entities to indicate cell-barred status and store-and-forward operation mode availability, enabling dynamic switching between modes based on feeder link availability and UE capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If satellite network entities use normal communication mode continuously, then communication reliability is maintained when feeder link is available, but communication fails when feeder link is intermittent due to satellite movement and Earth rotation
Solution Approach 1:
The system dynamically switches between normal communication mode and store-and-forward mode based on feeder link availability. The satellite network entity and UE adapt their communication behavior in real-time according to connectivity conditions, transitioning from continuous normal mode to intermittent store-and-forward mode when feeder link becomes unavailable due to satellite movement and Earth rotation.
Solution Approach 2:
The communication mode parameter is changed based on feeder link status. When feeder link is available, normal mode is used; when feeder link becomes intermittent, the system transitions to store-and-forward mode by changing the operational parameters, allowing the same system to function reliably under varying connectivity conditions.
2Adaptability or versatility
If satellite network entities frequently update system information to indicate mode availability, then UE can adapt to changing connectivity conditions, but resource overhead increases
Solution Approach 1:
Instead of continuously updating system information, the satellite network entity performs partial updates only when necessary - specifically when transitioning between normal mode and store-and-forward mode. This reduces the frequency of system information updates while still providing sufficient information for UE to adapt to connectivity changes, thereby reducing resource overhead.
Solution Approach 2:
The system uses feedback mechanisms where the satellite network entity monitors feeder link availability and selectively updates system information based on actual mode transitions. This feedback-driven approach ensures UE receives updates only when needed, avoiding unnecessary resource consumption from frequent redundant updates.
3Reliability
If satellite network entities always operate in store-and-forward mode, then communication is maintained during feeder link unavailability, but communication efficiency decreases when feeder link is available
Solution Approach 1:
The communication mode is made dynamic rather than static. The system operates in normal mode when feeder link is available to maximize efficiency, and automatically transitions to store-and-forward mode when feeder link becomes unavailable to maintain reliability. This dynamic adaptation optimizes both efficiency and reliability based on real-time conditions.
Solution Approach 2:
The operational parameters are changed based on feeder link status. When feeder link is available, parameters are set for normal efficient communication; when feeder link becomes unavailable, parameters are changed to store-and-forward mode. This parameter adaptation ensures optimal communication efficiency during available periods while maintaining reliability during unavailability.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive, from a satellite network entity, signaling that includes a first indicator of a cell-barred operation status indicative of whether a set of UEs is barred from communications and a second indicator of whether a store and forward operation mode is available for communications. A UE that receives such signaling may evaluate a combination of a first value for the first indicator and a second value of the second indicator and determine an availability of the satellite network entity for communication. The combination of values may be used by the UE to determine whether to initiate connections or communications, refrain from communicating, or communicate in accordance with a store and forward mode. Additionally, the satellite network entity may update the indications in response to a condition associated with a feeder link connection changing.