Mobile Relay Area Scheduling for Congestion-Aware IoT Uplinks
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Solution Overview
Problem
In IoT systems, data transmission from multiple IoT terminals can cause communication congestion and reduce reliability due to varying congestion levels, as existing techniques do not effectively manage transmission schedules based on the occupancy status of the base station.
Innovation Solution
A wireless communication system where a mobile relay apparatus, such as a LEO satellite, divides the communication area into small areas based on the positions and congestion levels of IoT terminals, and transmits area information to manage transmission timings, ensuring uniform congestion levels across these areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If uniform transmission scheduling is used for IoT terminals, then transmission simplicity is improved, but communication reliability deteriorates when congestion levels vary
Solution Approach 1:
The patent applies dynamics by transitioning from static uniform scheduling to dynamic congestion-aware scheduling. The base station measures congestion levels in real-time and adjusts transmission schedules accordingly, allowing the system to adapt to varying traffic conditions while maintaining reliability without sacrificing operational simplicity
Solution Approach 2:
The patent implements feedback mechanisms where the base station measures congestion levels and uses this information to adjust transmission schedules. This closed-loop approach ensures that transmission timing is optimized based on actual network conditions, resolving the contradiction between scheduling simplicity and communication reliability
2Loss of time
If LEO satellite is used as relay station, then communication latency and propagation loss are reduced, but visible time slot is limited
Solution Approach 1:
The patent applies preliminary action by having IoT terminals perform area division and determine their own transmission timing before actual communication occurs. Terminals pre-calculate whether they should transmit based on their position relative to divided areas, allowing efficient use of limited visible time slots without waiting for real-time base station control
Solution Approach 2:
The patent segments the communication area into multiple sub-areas managed by different LEO satellites. This segmentation allows terminals to be served by the most appropriate satellite at any given time, maximizing the utilization of limited visible time slots and reducing overall communication latency through parallel operations across multiple satellites
3Area of stationary object
If number of IoT terminals increases, then system coverage is improved, but data packet collisions increase
Solution Approach 1:
The patent segments the service area into multiple sub-areas, each served by a specific LEO satellite. This spatial segmentation allows the system to scale coverage by adding more satellites without proportionally increasing collisions, as terminals in different segments use different time slots and frequencies
Solution Approach 2:
The patent applies local quality by assigning different transmission characteristics to different spatial regions. Each sub-area has customized transmission parameters based on local congestion conditions and satellite coverage, allowing the system to handle increasing numbers of terminals in different locations with differentiated service quality
Data Source
AI summary
In a wireless communication system in which a relay apparatus provided in a mobile object wirelessly communicates with a plurality of communication apparatuses placed at different locations, the relay apparatus includes a receiver that receives a signal transmitted from each of the plurality of communication apparatus, the signal including position information indicating a position of each communication apparatus, a measurement unit that measures a congestion level of communication, a control unit that divides a communication target area into a plurality of small areas in accordance with the positions of the plurality of communication apparatuses and the congestion level of communication and generates area information indicating a position of each of the small areas, and a transmitter that sequentially transmits a plurality of pieces of the area information when the relay apparatus is positioned in a range in which the relay apparatus can communicate with the communication apparatuses, and each communication apparatus includes a storage unit that stores transmission data, a receiver that receives the area information, a control unit that determines whether a position of the communication apparatus is included in the small area in accordance with the area information, and a transmitter that transmits a signal including the transmission data and position information indicating a position of the communication apparatus to the relay apparatus when the position of the communication apparatus is included in the small area.