Siemens IEEE802.11 Manuel d'utilisateur télécharger pdf (Page 35)

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STA “B”

cannot receive

data from

STA “A”

Problem – Stations contending for the medium do not

Hear

each other

STA “B” STA“A”

RTS-Range

Access Point

CTS-Range

RTS

CTS

STA A

AP

STA B

DIFS

STA “B” cannot detect carrier from STA “A”

Next MPDU

Time period to defer access

is based on duration in CTS Back off after defer

Ack

Data

Solution – Optional use of the

Duration

field in RTS and CTS frames with AP

“Hidden Node” Provisions

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