sanhita-multichannel

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

Info iconThis preview shows pages 1–12. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 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 • 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 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 1 2 802.11 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) 802.11 Distributed Coordination Function A B C D A B C D Time 802.11 Distributed Coordination Function A B C D A B C D RTS Time RTS 802.11 Distributed Coordination Function A B C D A B C D RTS CTS SIFS NAV Time CTS 802.11 Distributed Coordination Function A B C D A B C D RTS CTS DATA SIFS NAV NAV Time DATA 802.11 Distributed Coordination Function A B C D A B C D RTS CTS DATA SIFS ACK NAV NAV Time ACK 802.11 Distributed Coordination Function A B C D A B C D RTS CTS DATA SIFS ACK NAV NAV DIFS Time Contention Window 802.11 Power Saving Mechanism802....
View Full Document

This note was uploaded on 01/16/2012 for the course ECE 256 taught by Professor Choudhury during the Spring '11 term at Duke.

Page1 / 36

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

This preview shows document pages 1 - 12. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online