Satellite Relay Queue Prioritization for Time-Limited IoT Uplinks
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Solution Overview
Problem
Satellite IoT systems using low earth orbit satellites face delays in data transfer due to limited communication time periods, complicating device design with the need for multiple satellite channels, which is challenging for IoT terminals in remote areas that require simplicity, smaller size, and low power consumption.
Innovation Solution
A wireless communication system with a mobile relay device mounted on a satellite that sorts and stores transmission data into priority and general queues based on preamble patterns or reception timing, prioritizing specific service data for timely transfer to base stations, while maintaining device simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple satellite channels are allocated to reduce data transfer delays, then data transfer efficiency is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-sorting uplink data into priority queues before the satellite passes overhead. The relay station categorizes data based on service types (e.g., safety-critical vs. non-critical) and stores them in separate queues. When the satellite becomes visible, the relay station can immediately transmit high-priority data without waiting for satellite availability, thereby reducing delays without requiring multiple satellite channels or complex terminal devices.
2Use of energy by moving object
If LPWA is used for satellite IoT communication, then power consumption is reduced, but data transfer speed decreases
Solution Approach 1:
The patent applies preliminary action by pre-sorting uplink data into priority queues before the satellite passes overhead. The relay station categorizes data based on service types (e.g., safety-critical vs. non-critical) and stores them in separate queues. When the satellite becomes visible, the relay station can immediately transmit high-priority data without waiting for satellite availability, thereby reducing delays without requiring multiple satellite channels or complex terminal devices.
3Loss of time
If low earth orbit satellite is used, then communication delay is reduced, but communication time period is limited
Solution Approach 1:
The patent applies preliminary action by pre-sorting uplink data into priority queues before the satellite passes overhead. The relay station categorizes data based on service types (e.g., safety-critical vs. non-critical) and stores them in separate queues. When the satellite becomes visible, the relay station can immediately transmit high-priority data without waiting for satellite availability, thereby reducing delays without requiring multiple satellite channels or complex terminal devices.
Data Source
AI summary
Provided is a wireless communication system including a plurality of terminal devices, a relay device mounted on a mobile object, and at least one base station device, in which the terminal device includes a terminal device transmission unit that transmits a signal including transmission data to the relay device, and the relay device includes: a relay device reception unit that receives the signal transmitted from the terminal device; a plurality of queues that stores the transmission data included in the signal; a sorting unit that sorts and records the transmission data included in the signal into any one of the plurality of queues on the basis of a preamble pattern included in the signal or a reception timing of the signal; and a relay device transmission unit that transmits signals indicating the transmission data recorded in the plurality of queues to the base station device at a timing at which communication with the base station device is possible, while prioritizing transmission data recorded in a predetermined queue among the plurality of queues.