Smart Meter Network Switching for PLC Interference
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Solution Overview
Problem
Powerline communication networks for smart electricity meters face interference and unreliability due to crosstalk, noise, and impedance mismatches, leading to packet loss and disconnections, which complicates the transmission of encrypted information to management entities, requiring improved security and efficiency while maintaining low costs.
Innovation Solution
A method that encrypts information using shared keys within the communication network, automatically switches between primary and secondary communication networks (such as LPWAN) based on connection stability and acknowledgment receipt, ensuring encrypted information is transmitted independently of the selected network, utilizing LoRaWan or PRIME/G3-PLC standards for reliable data transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If power line communication networks are used for transmitting information from smart electricity meters to management entities, then the transmission can be performed using existing infrastructure, but the transmission reliability deteriorates due to crosstalk, noise, and impedance mismatches
Solution Approach 1:
The system dynamically switches between primary power line communication network and secondary LPWAN network based on real-time connection status and packet loss detection. The smart electricity meter monitors communication quality and automatically selects the appropriate network, making the system adaptive to changing conditions rather than static
Solution Approach 2:
The patent introduces an intermediary selection mechanism that chooses between two communication networks based on reliability conditions. When the primary network fails or shows high packet loss, the system uses the secondary network as an intermediary path to deliver information, ensuring continuous communication
2Object-affected harmful factors
If encryption keys are shared between smart electricity meters and management entity, then information security is improved, but the complexity of key management increases
Solution Approach 1:
The smart electricity meter autonomously manages encryption keys and performs encryption operations locally without requiring key distribution infrastructure or complex key management systems. The meter uses pre-shared keys to encrypt information before transmission, making the system self-sufficient in security operations
Solution Approach 2:
Encryption keys are pre-shared between smart electricity meters and management entities before communication begins. This preliminary key establishment simplifies ongoing communication security, as the meters can encrypt information using these pre-configured keys without requiring complex key exchange protocols during data transmission
3Reliability
If automatic network switching is implemented to improve transmission reliability, then the response time to network failures decreases, but the device complexity increases
Solution Approach 1:
The smart electricity meter continuously monitors communication quality through feedback mechanisms, detecting packet loss and connection status. Based on this feedback, the system automatically determines when to switch between primary and secondary networks, creating a closed-loop control system that responds to actual communication conditions
Solution Approach 2:
The network switching decision is made autonomously by the smart electricity meter itself based on local monitoring of communication quality. The meter independently evaluates network conditions and selects the appropriate transmission path without requiring centralized control or complex switching infrastructure
Data Source
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AI summary
Encrypted information is to be transmitted to a management entity in a system comprising smart electricity meters connected to a concentrator device via a primary power line communication (PLC) network, and connected to a data collection gateway via a secondary LPWAN network. Each smart electricity meter wishing to transmit this information: encrypts (302) the information using keys shared with the management entity within an application-level encryption context established via the primary network; selects (303) the primary network by default, and switches (303) to the secondary network following malfunctions of the primary network; and transmits (304, 305) a frame to the management entity via the selected network, the frame being such that its payload consists of the encrypted information, so that the information is encrypted regardless of the network actually selected.