Priority-Aware Ephemeris Broadcast Scheduling for NTN Uplink Conflicts
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Solution Overview
Problem
Existing 5G wireless communication systems face challenges in managing variable resource demands from mobile devices due to differing quality-of-service classes, particularly in non-terrestrial networks, where ephemeris information delivery can overwhelm user equipment during uplink traffic periods, leading to synchronization issues.
Innovation Solution
A method is introduced where a non-terrestrial radio network node assigns priority to ephemeris system information blocks, allowing user equipment to manage ephemeris information reception based on priority indications, avoiding conflicts with uplink traffic by determining and applying system information block priorities using ephemeris parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ephemeris information is delivered continuously to all user equipment, then synchronization accuracy is improved, but network resource consumption and user equipment processing load increase
Solution Approach 1:
The patent applies local quality by differentiating ephemeris information delivery based on user equipment characteristics. User equipment is categorized into different groups (e.g., half-duplex vs. full-duplex, different capability levels) and receives appropriately tailored ephemeris information. This ensures synchronization accuracy for each group without unnecessarily consuming network resources for all equipment uniformly.
Solution Approach 2:
The patent implements dynamic ephemeris information delivery where the network node adjusts the frequency and content of ephemeris broadcasts based on current system conditions, user equipment states, and traffic patterns. This dynamic approach maintains synchronization accuracy when needed while reducing resource consumption during periods of low demand or stable conditions.
2Reliability
If ephemeris information is delivered during all time periods, then synchronization is maintained, but uplink traffic transmission is interfered with
Solution Approach 1:
The patent implements periodic ephemeris information delivery where broadcasts occur at specific intervals rather than continuously. The timing is coordinated to avoid conflicts with uplink traffic periods. For example, ephemeris information may be delivered during downlink periods or during scheduled intervals that do not overlap with uplink transmissions, thus maintaining synchronization while preserving uplink productivity.
Solution Approach 2:
The network node performs preliminary scheduling of ephemeris information delivery to avoid conflicts with uplink traffic. By planning and announcing delivery times in advance, user equipment can prepare to receive ephemeris information during appropriate windows without interfering with scheduled uplink transmissions, thus maintaining both synchronization and uplink productivity.
3Productivity
If priority assignment is implemented for ephemeris information blocks, then resource management efficiency is improved, but system complexity increases
Solution Approach 1:
The patent segments ephemeris information into different priority levels or categories (e.g., critical synchronization data vs. routine updates). This segmentation allows the network to apply different resource management strategies to different segments, improving overall efficiency without requiring complex management of all information uniformly. The segmentation approach simplifies priority handling by creating clear categories rather than continuous complexity.
Data Source
AI summary
A non-terrestrial radio network node receives, and transmits to a user equipment, ephemeris system information block priority configuration information. The non-terrestrial node determines parameter value change(s) corresponding to an upcoming ephemeris system information block occasion group with respect to a previous/preceding occasion group. The non-terrestrial node assigns, and transmits to the user equipment, an assigned priority, corresponding to the upcoming group, that is based on the determined parameter value change(s) or a rate of change corresponding thereto. From the priority configuration information, the user equipment determines a worst-case parameter value(s) of parameter range(s) corresponding to the assigned priority. The user equipment may determine to avoid receiving updated ephemeris information via an upcoming group occasion if the worst-case parameter value(s) does/do not exceed a configured corresponding asynchronization criterion and may instead transmit uplink traffic during upcoming group occasions.