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Busy ToneChannel

ChannelData

Time

Random Backoffprocedure

Random Backoffprocedure

Stage 1: Stage 1:

transmissionData /ACK Collisions Detection

RTS/CTS handshake transmissionData /ACK

RTS/CTS handshake

Packet 1 Packet 2

Stage 2:Collisions Detection

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DSCRIEEE 802.11

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Topology Index

DSCRIEEE 802.11

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DSCRIEEE 802.11

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Station that sense BT1:

BT1BT1BT1BT1BT1

DIFS backoff stage blackburst

(a) ......DATA

......ACK

......CTS

......RTS

BT2

(b)

BT2 BT2 BT2 BT2BT1 BT1 BT1 BT1BT1

High priority source station:

(c)

BT2 BT2 BT2 BT2 BT2

Busy Data Channel

Station that sense BT2:

of a low priority packet is deferred for the RTS/CTS handshake durationThe arrows indicate a sensed BT1. After BT1 is sensed, transmission

The arrows indicate a sensed BT2. After BT2 is sensed, transmission of a low priority packet is deferred for the RTS/CTS handshake duration

in their actual lengths due to space limitation. RTS, CTS, DATA, and ACK are not represented Note: One tick represents one half of a slot.

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1 2 0

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Station2

Station1

BT1 BT1 BT1 BT1 BT1

BT1 BT1 BT1 BT1 BT1 BT1

Transmit Packet

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M−1 M−1 M−1 M−1 Mt0 t2

t1

flow 1 flow 2High priority flows

interferencerange

flow 3low priority flow

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