Hidden node” provisions – Siemens IEEE802.11 User Manual
Page 35
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© Siemens, 2002
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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