In the 802.11 frame, which message is used for the terminal to receive data packets in power saving mode?

Question

Options

• ARTS
• BCTS
• CACK
• DPS-Poll

• A
  6% (3)
• B
  79% (41)
• C
  12% (6)
• D
  4% (2)

Explanation

There appears to be an error in the provided answer key. The correct answer to this question is D (PS-Poll), not B (CTS).

PS-Poll (Power Save Poll) is a control frame defined specifically in the 802.11 standard for power saving mode. When a station operating in power save mode wakes up from sleep, it sends a PS-Poll frame to the access point to retrieve any data packets the AP has buffered on its behalf. RTS (Request to Send) is used to reserve the wireless medium before a transmission to reduce collisions, and CTS (Clear to Send) is the AP or receiver's reply to an RTS frame - neither is related to power saving. ACK is an acknowledgment frame sent after successfully receiving a data frame, confirming delivery. A useful memory tip: PS-Poll stands for "Power Save Poll," which directly describes the action - a sleeping station polling the AP for its buffered frames when it wakes up.

Please verify this question against your course materials, as the listed correct answer of B (CTS) does not match standard 802.11 power saving operation.

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