Dual Transceiver Data Concentrator for Wireless Key Update Reliability
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Solution Overview
Problem
Wireless networks with asymmetric computing resources face challenges in ensuring all nodes receive encryption key updates due to interference and RF propagation issues, leading to incomplete key updates.
Innovation Solution
A wireless communication system with a data concentrator equipped with two transceivers, where one transceiver acts as primary for normal communication and the other as secondary for key updates, ensuring all nodes successfully update encryption keys by re-sending the new key if necessary, and transitioning roles for efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single transceiver is used for key update communication, then device complexity is reduced, but reliability of key update delivery deteriorates due to interference and RF propagation issues
Solution Approach 1:
The communication function is segmented into two separate transceivers: a first transceiver for normal data communication and a second transceiver dedicated to key update communication. This segmentation isolates key update traffic from regular data traffic, preventing interference and ensuring reliable key delivery even in challenging RF conditions.
Solution Approach 2:
The second transceiver acts as an intermediary channel specifically for key update messages. By introducing this dedicated intermediary communication path, the system ensures that key updates are transmitted through a separate, protected channel that is not subject to the same interference as the primary data communication channel.
2Reliability
If the data concentrator waits for all nodes to update keys before switching transceivers, then reliability of key update is improved, but productivity of the system deteriorates due to extended update time
Solution Approach 1:
The system sends key update messages using the second transceiver before formally switching to use the first transceiver for normal communication. This preliminary action allows the key updates to be in progress on the dedicated channel before the system transitions, ensuring that nodes receive updates without requiring the system to wait for all nodes to complete updates before switching transceivers.
Solution Approach 2:
The system employs periodic transmission of key update messages through the second transceiver to multiple nodes. Rather than waiting for acknowledgment from each node sequentially, the data concentrator periodically sends updates to different nodes using the dedicated second transceiver, enabling parallel progress across the network and improving overall update speed while maintaining reliability.
3Reliability
If the secondary transceiver continues monitoring with the old key, then reliability of detecting missed updates is improved, but use of energy deteriorates due to extended monitoring period
Solution Approach 1:
The system dynamically adjusts the monitoring behavior of the second transceiver based on the update phase. During the key transition period, the second transceiver actively monitors for nodes that missed updates by attempting to decrypt their messages with the old key. After a predetermined time period or upon successful detection, the monitoring behavior is reduced or stopped, allowing the transceiver to enter lower-power states and reducing overall energy consumption while maintaining necessary reliability.
Data Source
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AI summary
A wireless communication system and method includes a first wireless node and a data concentrator configured to provide a new encryption key updated from a current encryption key to the first wireless node (52). The data concentrator includes first and second transceivers. The data concentrator provides a key update message that includes the new encryption key to the first wireless node via the first transceiver (54). The key update message is encrypted using the current encryption key (56). The data concentrator is configured to decrypt first transmissions from the first wireless node via the second transceiver using the new encryption key, and decrypt the first transmissions via the first transceiver using the current encryption key.