NOVUS LABS - Redpine signals wireless interoperability and power consumption under
congestion Across 100 routers



Publication date:   22 March 2019


Widespread adoption of Smart IoT devices such as smart locks, video door bells, and smart watches rely on device vendors meeting two key challenges unique to these devices - staying connected securely to their Wi-Fi Access Point (routers) and cloud while adhering to ultra-low power budgets that are much more stringent than a Smartphone. Connectivity and power consumption of an always-ON connection measured under ideal conditions with only a few wireless routers doesn't show the complete picture. Wireless channel congestion, router make and model, can affect interoperability and power consumption.

Given the importance of the interoperability and "connected power" metric for IoT devices - Redpine Signals commissioned Novus Labs to evaluate interoperability and power consumption of their silicon by connecting securely across 100 popular wireless routers. For each router a 25-minute test was conducted to check robustness and measure the power consumption and under varying levels of network congestion. The end-results have been tabulated by Novus Labs and can be used by device vendors, looking at using Redpine Wireless chips, as a measure of robustness, to compute battery life under various real-life conditions and predict variations across routers in their user base.

The power consumption of the Redpine Signals solutions was dramatically lower than the competition in every test scenario.


Key Highlights

Below are key highlights from the testing conducted on Redpine Signals Wireless MCU SoC:

1. Robust secure connectivity and interoperability observed during the whole test for all 100 routers with:

  • Zero Wi-Fi disconnects
  • Zero TCP disconnects
  • 100% reception of application messages sent once every 55 seconds during the test.

2. Ultra-Low power consumption

  • With clean channel, average of only 113uA across all 100 routers
  • With 'close to saturation' channel utilization of 90% the average power consumption increases to only 293uA averaged across all 100 routers
  • 98% of the routers were within 2x of the 100-router average power consumption

3. Significant battery life Achievable:

  • Based on above measurements the typical battery life for an "Always Connected" Smart-lock application is 3 years for a low congestion environment (e.g., single-family home) and 2 years for a dense and congested wireless environment (e.g., some apartments, offices and hotels) (see Appendix B)


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