Microsoft Patent: power saving Wi-Fi tethering

Microsoft has filed a patent called “power saving Wi-Fi tethering” to save power consumption during Wi-Fi Internet sharing or tethering.

According to patent, “this techniques reduce the power consumption of a Wi-Fi tethering device by switching the Wi-Fi functionality of the Wi-Fi tethering device from a normal operational mode to a sleep mode during idle intervals.”

Microsoft Patent power saving Wi-Fi tethering
This image shows an overview how the technique works to save power during Wi-Fi tethering. Image/ Patentscope

This technique uses a sleep protocol, where a sleep schedule is established between Wi-Fi tethering device and Wi-Fi client.

“The techniques describe a sleep interval adaptation algorithm to establish sleep duration intervals based on data packet exchange patterns associated with different applications executing on the Wi-Fi client device and/or different operations being performed by the Wi-Fi client device” says the patent application.

Wi-Fi tethering allow you to share Internet connection with other mobile devices via a Wi-Fi interface. A Wi-Fi tethering device may connect to the Internet and then act as a mobile software access point (SoftAP) for the other devices located within a threshold distance from the Wi-Fi tethering device.

However, operating a mobile hotspot via Wi-Fi tethering significantly increases the power consumption of the Wi-Fi tethering device, and thereby reduces operation time when the Wi-Fi tethering device is powered by a battery. For example, when the Wi-Fi tethering device operates as a SoftAP and shares an Internet connection, the Wi-Fi interface of the Wi-Fi tethering device is always in a high power consumption state even when the Wi-Fi tethering device is not exchanging data packets with or routing data packets to the other devices.

SOURCEPATENTSCOPE
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