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Question 19 - CWAP-404 discussion

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What is used to respond with an uplink transmission to an MU-RTS trigger frame in the 802.11ax PHY?

A.
HE SU PPDU
Answers
A.
HE SU PPDU
B.
HE MU PPDU
Answers
B.
HE MU PPDU
C.
HE TB PPDU
Answers
C.
HE TB PPDU
D.
VHT PPDU
Answers
D.
VHT PPDU
Suggested answer: C

Explanation:

An HE TB PPDU (High Efficiency Trigger-Based Packet Data Unit) is used to respond with an uplink transmission to an MU-RTS trigger frame in the 802.11ax PHY (Physical Layer). An MU-RTS trigger frame is a frame that initiates a multi-user transmission opportunity (MU-TXOP) by requesting multiple stations (STAs) to send clear-to-send (CTS) frames on different spatial streams or resource units (RUs). An HE TB PPDU is a frame that contains data from multiple STAs that have been allocated RUs by an MU-RTS trigger frame or another type of trigger frame. An HE SU PPDU (High Efficiency Single User Packet Data Unit) is a frame that contains data from a single STA using all available spatial streams or RUs. An HE MU PPDU (High Efficiency Multi User Packet Data Unit) is a frame that contains data from multiple STAs using different spatial streams or RUs without being triggered by another frame. A VHT PPDU (Very High Throughput Packet Data Unit) is a frame that uses the 802.11ac PHY and does not support multi-user transmissions.

Reference:

CWAP-404 Study Guide, Chapter 3: 802.11 MAC Layer Frame Formats and Technologies, page 101

CWAP-404 Objectives, Section 3.4: Analyze multi-user transmissions

CWAP-404 Study Guide, Chapter 3: 802.11 MAC Layer Frame Formats and Technologies, page 99

asked 16/09/2024
Ignacio Negrete
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