NTN Scheduling Request Handling for High-Delay Collision Avoidance
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Solution Overview
Problem
Existing scheduling mechanisms in non-terrestrial networks (NTNs) face challenges in efficiently managing scheduling requests (SRs) due to high propagation delays and varying network conditions, leading to inefficiencies and potential collisions in satellite-based communication systems.
Innovation Solution
Implementing enhanced SR procedures tailored for NTNs, including adaptive timing adjustments and collision avoidance mechanisms, to optimize SR handling in high-latency environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing scheduling mechanisms are used in NTN, then device complexity is reduced, but SR management efficiency deteriorates due to high propagation delays and collisions
Solution Approach 1:
The patent implements dynamic SR procedure adjustments based on satellite position, velocity, and propagation delay conditions. The scheduling mechanism adapts timing parameters and collision avoidance strategies in real-time according to changing NTN network conditions, resolving the contradiction between efficiency and complexity by making the system responsive rather than static
Solution Approach 2:
The patent modifies scheduling parameters such as timing windows, transmission intervals, and collision detection thresholds to optimize SR management under high propagation delay conditions. By adjusting these parameters dynamically based on satellite orbit characteristics and network load, the system achieves better efficiency without proportionally increasing complexity
2Reliability
If adaptive timing adjustments are implemented, then SR collision avoidance improves, but system complexity increases
Solution Approach 1:
The patent performs preliminary timing calculations and collision detection before SR transmission occurs. By pre-computing safe transmission windows based on predicted satellite positions and current network state, the system avoids collisions proactively rather than reacting to them, improving reliability while keeping the complexity manageable through preparation rather than continuous complex processing
3Reliability
If enhanced SR procedures are implemented, then communication reliability improves, but processing time increases
Solution Approach 1:
The patent implements periodic SR transmission opportunities with optimized intervals rather than continuous or random transmission attempts. By establishing regular scheduling cycles that account for propagation delays, the system achieves reliable communication through consistent timing patterns while reducing processing time compared to continuous adaptive approaches
Data Source
AI summary
A media access control (MAC) layer of a wireless device sends a first indication indicating transmission of a scheduling request (SR) to a physical layer of the wireless device. The MAC layer receives from the physical layer a second indication indicating the SR is being dropped. In some cases, the MAC layer may receive one or more SR configuration parameters indicating at least one of: an SR prohibit timer; a maximum SR transmission counter; or one or more physical uplink control channel (PUCCH) resources. Based on the receiving the second indication, the MAC layer stops the SR prohibit timer and decrements an SR counter.