Staged Wake-Up Scheme for Implantable Medical Device Communication
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Solution Overview
Problem
Implantable medical devices face challenges in reducing power consumption during wake-up schemes for communication, as conventional methods consume significant power due to frequent and lengthy scans for polling messages, which shortens battery life and delays communication responses.
Innovation Solution
A staged detection wake-up scheme with dynamic parameter adaptation, where initial low-level scans trigger more thorough scans based on signal characteristics and ambient conditions, reducing the number of high-power scans and optimizing detection sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the transceiver performs frequent and lengthy scans for polling messages, then the communication response time is reduced, but the power consumption increases significantly
Solution Approach 1:
The wake-up scheme is divided into multiple stages: an initial low-power energy detection stage that performs brief scans to assess RF energy levels, and a subsequent high-power full scan stage that only executes when the initial stage detects potential polling messages. This segmentation allows the system to respond quickly when needed while minimizing power consumption during most periods when no communication is required.
Solution Approach 2:
The system performs a preliminary energy detection scan before initiating a full communication scan. This preliminary action assesses whether RF energy consistent with polling messages is present, and only triggers the power-intensive full scan if the preliminary detection indicates potential communication activity, thereby avoiding unnecessary high-power scans and reducing overall power consumption.
2Duration of action of stationary object
If the transceiver is kept in a powered-off or low power state, then the battery life is extended, but the communication response time increases
Solution Approach 1:
The transceiver operates in a periodic wake-up cycle, transitioning between powered-off/low-power states and active scanning states. The system periodically performs brief low-power energy detection scans to monitor for polling messages, and only transitions to full-power operation when necessary. This periodic action extends battery life by keeping the transceiver off most of the time while ensuring timely communication responses when external devices attempt to connect.
3Measurement precision
If the RF receiver is enabled for a long period to perform thorough scans, then the detection accuracy is improved, but the power consumption increases
Solution Approach 1:
The system dynamically adjusts the duration and intensity of RF receiver operation based on detected conditions. During initial wake-up phases, the receiver operates at reduced power with shorter scan durations. When energy detection indicates potential polling messages, the system transitions to higher-power full scan mode with longer detection periods. This dynamic adjustment ensures accurate detection when needed while minimizing power consumption during low-activity periods.
Data Source
AI summary
A communication wake-up scheme for an implantable medical device may involve repeatedly activating a receiver to determine whether an external device is attempting to establish communication with the implantable device. To reduce the amount of power consumed by the implantable device in conjunction with the wake-up scheme, the scheme may involve conducting preliminary radio frequency signal detections as a precursor to conducting a full scan. In this way, power may be conserved since the more power intensive full scans may be performed less frequently. This preliminary detection of radio frequency signals also may be adapted to reduce the number of full scans performed by the implantable device that do not result in communication with the external device. In some embodiments the adaptation involves adjusting one or more thresholds that are used in conjunction with the preliminary detection of radio frequency signals.