When compared with legacy Power Save mode, how does VHT TXOP power save improve battery life for devices on a WLAN?

Question

Options

• ALegacy Power Save mode was removed in the 802.11ac amendment.
• BVHT TXOP power save allows the WLAN transceiver to disable more components when in a low
• CVHT TXOP power save uses the partial AID in the preamble to allow clients to identify frames
• DVHT TXOP power save allows stations to enter sleep mode and legacy Power Save does not.

• A
  6% (2)
• B
  88% (30)
• C
  3% (1)
• D
  3% (1)

Explanation

VHT TXOP (Very High Throughput Transmit Opportunity) power save is a feature introduced with the 802.11ac amendment, which is designed to improve the power efficiency of devices connected to a WLAN. This feature enhances battery life in several ways, compared to the legacy Power Save mode: Enhanced Power Saving: VHT TXOP power save allows devices to disable more components of the WLAN transceiver when they are in a low power state. This reduces the power consumption during periods when the device is not actively transmitting or receiving data. Intelligent Wake-Up Mechanisms: It employs more sophisticated mechanisms for devices to determine when they need to wake up and listen to the channel, further reducing unnecessary power usage. Optimized Operation: This power save mode is optimized for the high-throughput environment of 802.11ac networks, allowing devices to efficiently manage power while maintaining high Legacy Power Save mode, introduced in earlier versions of the 802.11 standards, does not provide the same level of component disablement or the intelligent wake-up mechanisms found in VHT TXOP power save, making option B the correct answer.

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