Adaptive Frequency Hopping for Interference-Resilient WBMS Links
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Solution Overview
Problem
Battery packs with complex chemistries require efficient monitoring and control of battery cells to maintain balance and extend performance, while wireless connections face interference from other wireless devices in unlicensed frequency bands.
Innovation Solution
Adaptive frequency hopping technique for wireless battery management systems (WBMS) that dynamically switches channels based on statistical analysis to avoid interference, using a primary node to coordinate channel switching with secondary nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wireless connections use unlicensed frequency bands for battery management systems, then ease of operation and adaptability are improved, but communication reliability deteriorates due to interference from other wireless devices
Solution Approach 1:
The system dynamically switches between different frequency channels based on measured interference conditions. The primary node and secondary nodes continuously monitor channel quality and adaptively hop to alternative channels when interference is detected, transforming a static frequency assignment into a dynamic, responsive communication system that maintains reliability while using unlicensed bands.
Solution Approach 2:
The system changes the frequency parameter of communication channels based on measured statistics. By adjusting the operating frequency away from interfered channels and toward cleaner channels, the system maintains communication reliability while operating in flexible unlicensed bands. This parameter adaptation allows the system to evade interference without requiring licensed spectrum.
2Reliability
If adaptive frequency hopping is implemented to avoid interference, then communication reliability is improved, but device complexity increases due to channel switching coordination
Solution Approach 1:
The frequency hopping function is segmented between primary nodes and secondary nodes. Primary nodes perform comprehensive channel measurements and determine the set of usable channels, then instruct secondary nodes on channel switching. This segmentation allows the more complex measurement and decision-making functions to be centralized in primary nodes, while secondary nodes execute simpler switching commands, reducing overall system complexity.
Solution Approach 2:
The primary node acts as an intermediary that coordinates channel switching for the entire group. Instead of each node independently managing frequency hopping (which would be complex), the primary node measures channels, determines usable frequencies, and provides switching instructions to secondary nodes. This intermediary approach simplifies individual node complexity while maintaining group-wide reliability.
3Ease of operation
If channel switching coordination is centralized at primary nodes, then ease of operation is improved, but loss of time increases due to measurement and instruction transmission delays
Solution Approach 1:
Primary nodes perform channel measurements and determine the set of usable channels in advance, before secondary nodes need to switch. By proactively identifying suitable alternative channels and preparing switching instructions, the system reduces the actual switching delay when interference is detected. The preliminary channel assessment work is done continuously in the background, so when hopping is needed, the transition can occur more quickly.
Data Source
AI summary
A method for channel switching by a secondary node. The method includes: receiving, from a primary node, a downlink transmission, measuring one or more statistics about the downlink transmission, determining, from the downlink transmission, an uplink interval, transmitting, to the primary node during the uplink interval, the measured one or more statistics about the downlink transmission, receiving, from the primary node, an indication of a set of useable channels, determining, based on the set of useable channels and at least one of the primary node or the secondary node, a next channel from the set of useable channels, and switching to the next channel based on a switch indication from the primary node.