HEMS Terminal Address Setting via Router Advertisement
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Solution Overview
Problem
In home area networks with multiple wireless devices serving as edge routers, HEMS terminals face high processing loads when selecting multiple IPv6 addresses for packet transmission, which is inefficient due to limited resources.
Innovation Solution
A method where a first wireless device sends a router advertisement, allowing a second wireless device and a wireless terminal to generate an address based on the advertisement prefix, confirming connection to an external server, and setting the packet route through the second wireless device, replacing the source address prefix to minimize address selection processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HEMS terminals are assigned multiple IPv6 addresses from multiple edge routers, then connectivity to external servers is improved, but processing load increases due to address selection requirements
Solution Approach 1:
The patent introduces a router advertisement message as an intermediary mechanism that carries routing information from edge routers to HEMS terminals. This message includes a prefix list with multiple entries, each containing a prefix, valid lifetime, and preferred lifetime. The terminal uses this pre-delivered information to automatically select addresses without complex real-time selection processing, thus improving connectivity while reducing processing load.
Solution Approach 2:
The patent implements preliminary action by having edge routers send router advertisement messages in advance that contain pre-configured prefix information. The HEMS terminals receive and store this information before actual communication needs arise, allowing them to quickly determine source addresses without complex selection algorithms during packet transmission, thereby reducing processing load while maintaining reliable connectivity.
2Measurement precision
If HEMS terminals perform address selection processing, then packet routing accuracy is improved, but energy consumption increases due to limited terminal resources
Solution Approach 1:
The patent enables self-service by designing the router advertisement message to contain all necessary routing information (prefix list with valid and preferred lifetimes) that allows HEMS terminals to autonomously determine source addresses without requiring complex selection algorithms. The terminal simply matches its interface addresses with the received prefix information, significantly reducing computational energy consumption while maintaining accurate packet routing.
3Adaptability or versatility
If multiple edge routers are deployed in home networks, then network coverage and connectivity are improved, but address management complexity increases for wireless terminals
Solution Approach 1:
The patent uses router advertisement messages as intermediaries that consolidate routing information from multiple edge routers into a single structured format. The messages contain prefix lists with validity and preference information, allowing terminals to manage multiple network connections through a unified mechanism rather than handling each router separately, thus reducing address management complexity while maintaining broad network coverage.
Solution Approach 2:
The patent applies parameter changes by introducing valid lifetime and preferred lifetime parameters in the router advertisement messages. These parameters dynamically control which prefix should be used as the default source address, allowing terminals to automatically adapt to changing network conditions and router availability without complex management logic, thereby simplifying address management while supporting multiple edge routers.
Data Source
AI summary
An address setting method of a wireless communication system includes the steps of generating an address by each of a HEMS controller and a HEMS terminal based on an address prefix included in a router advertisement of a smart meter, and setting, by the HEMS terminal, a route of a packet sent to a HEMS server to a route by way of the HEMS controller. The HEMS controller performs NAT setting by replacing an address prefix of a source address of the packet sent to the HEMS server with an address prefix of the HEMS controller.