sanhita-multichannel

sanhita-multichannel - Multi-Channel MAC for Ad Hoc...

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Multi-Channel MAC for Ad Hoc Networks: Handling Multi-Channel Hidden Terminals Using A Single Transceiver Jungmin So and Nitin Vaidya University of Illinois at Urbana-Champaign
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Multiple Channels available in IEEE 802.11 3 channels in 802.11b 12 channels in 802.11a Utilizing multiple channels can improve throughput Allow simultaneous transmissions Motivation 1 defer 1 2 Single channel Multiple Channels
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Problem Statement Using k channels does not translate into throughput improvement by a factor of k Nodes listening on different channels cannot talk to each other Requires modification of coordination schemes among the nodes Constraint: Each node has only a single transceiver Capable of listening to one channel at a time Goal: Design a MAC protocol that utilizes multiple channels to improve overall performance Modify 802.11 DCF to work in multi-channel environment 1 2
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802.11 Distributed Coordination Function Virtual carrier sensing Sender sends Ready-To-Send (RTS) Receiver sends Clear-To-Send (CTS) RTS and CTS reserves the area around sender and receiver for the duration of dialogue Nodes that overhear RTS and CTS defer transmissions by setting Network Allocation Vector (NAV)
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802.11 Distributed Coordination Function A B C D A B C D Time
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802.11 Distributed Coordination Function A B C D A B C D RTS Time RTS
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802.11 Distributed Coordination Function A B C D A B C D RTS CTS SIFS NAV Time CTS
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802.11 Distributed Coordination Function A B C D A B C D RTS CTS DATA SIFS NAV NAV Time DATA
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802.11 Distributed Coordination Function A B C D A B C D RTS CTS DATA SIFS ACK NAV NAV Time ACK
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802.11 Distributed Coordination Function A B C D A B C D RTS CTS DATA SIFS ACK NAV NAV DIFS Time Contention Window
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802.11 Power Saving Mechanism
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