Radio Wave Generation Device Floor Entry Detection
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Solution Overview
Problem
Existing techniques fail to easily and effectively obtain information on wireless terminals that have newly entered an area subject to position determination.
Innovation Solution
A radio wave generation device with packet transmission and reception capabilities, a floor entry determination mechanism based on sensor data, and an address association function that associates MAC addresses of newly entered wireless terminals with their IP addresses by transmitting ARP request packets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If broadcast ARP requests are used to obtain information on wireless terminals, then all wireless terminals in the area can be detected, but network load increases and battery drain occurs on terminal devices
Solution Approach 1:
The system performs preliminary actions by maintaining an ARP table with pre-associated MAC address and IP address mappings. When a wireless terminal enters the coverage area, the system already has the terminal's MAC address from sensor data and can directly query the ARP table for its IP address without needing to send broadcast requests, thus reducing network load while still obtaining the necessary terminal information
Solution Approach 2:
The invention extracts only the necessary information (MAC address and IP address) and stores it in advance in the ARP table. This extracted information is then used for direct querying when terminals enter the area, eliminating the need for broadcast ARP requests and reducing overall network traffic while maintaining the ability to obtain terminal information efficiently
2Loss of information
If broadcast ARP requests are transmitted to detect wireless terminals, then terminal information can be obtained, but battery drain occurs on terminal devices
Solution Approach 1:
The system uses sensor data that is already being collected for position determination purposes to obtain MAC addresses of wireless terminals. This self-service approach leverages existing sensor data infrastructure to acquire terminal information without requiring additional active participation from the terminals themselves, thus avoiding battery drain while still obtaining the necessary terminal information
Solution Approach 2:
The system performs preliminary association of MAC addresses with IP addresses in the ARP table before terminals enter the coverage area. This pre-computed information is then directly queryable when terminals are detected via sensor data, eliminating the need for terminals to respond to ARP requests and thus preventing battery drain while maintaining information acquisition capability
3Measurement precision
If ARP table is updated frequently to maintain accurate terminal information, then terminal information accuracy improves, but processing time and system load increase
Solution Approach 1:
The system updates the ARP table periodically or event-driven (when sensor data indicates a terminal has entered or left the area) rather than continuously or on every network event. This periodic update approach maintains terminal information accuracy by refreshing the ARP table only when necessary, while minimizing processing time and system load by avoiding unnecessary updates
Data Source
AI summary
A radio wave generation device transmits and receives packets by radio waves. The radio wave generation device determines, based on sensor data acquired from a server, whether a wireless terminal has newly entered a floor subject to position determination. When it is determined that the wireless terminal has newly entered the floor subject to position determination, the radio wave generation device performs association of a MAC address of a floor entry terminal with an IP address, the floor entry terminal being the wireless terminal determined to have newly entered the floor subject to position determination. The radio wave generation device performs the association by transmitting a packet requesting a response from the floor entry terminal.