1 / 9

Cooperative Opportunistic Routing using Transmit Diversity in Wireless Mesh Networks

Cooperative Opportunistic Routing using Transmit Diversity in Wireless Mesh Networks. Jongryool Kim Networked Media Laboratory School of Information & Mechatronics Gwangju Institute of Science & Technology http://netmedia.gist.ac.kr. Introduction. Cooperation

lynley
Download Presentation

Cooperative Opportunistic Routing using Transmit Diversity in Wireless Mesh Networks

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Cooperative Opportunistic Routing using Transmit Diversity in Wireless Mesh Networks Jongryool Kim Networked Media Laboratory School of Information & Mechatronics Gwangju Institute of Science & Technology http://netmedia.gist.ac.kr

  2. Introduction • Cooperation • A generation of the relay data to multiple nodes with information to transmit that also serve as relays for each other • Neighboring nodes cooperate and assist in transmitting and receiving frames. • Transmit diversity : multiple transmit elements (MISO) • Opportunistic Routing • Some wireless network link’s error rate may be rather high for other links • This bring up the opportunity that a packet might skip a few nodes on its forwarding path if current radio propagation conditions are favorable

  3. ExOR (Extremely Opportunistic Routing) @sigcomm 05 src A B C D E dst src src A A B Traditional Routing B ExOR C C D D E E dst dst • Traditional routing suffers high overhead because of much retransmission • ExOR can take advantages of broadcast reach unexpectedly short or far

  4. Limitation of ExOR • Limitation of ExOR • The State-of-the-art opp. routing, ExOR imposes a global scheduler: • Selection Requires full coordination; every node must know who received what (too hard implementation) • Only one node transmits at a time, others listen (lost spatial reuse) packet packet packet packet A B src dst packet packet packet packet packet C

  5. MORE (MAC-independent Opportunistic Routing) @ sigcomm 07 • MORE • Source sends packets in batches • Forwarders keep all heard packets in a buffer • Nodes transmit linear combinations of buffered packets • Destination decodes once it receives enough combinations • Destination acks batch, and source moves to next batch P1 R1 αP1+ß P2 P2 src dst Batch P1 R2 γP1+δP2 P2 Batch

  6. TDiCOR (Transmit Diversity based on Cooperative Opportunistic Routing) @ Infocom 08 • Multiuser and transmit diversity -> overall throughput in WMN. • Cooperative Acknowledgements • MAC header contains the candidate set instead on a single receiver. • Only nodes enlisted in the header reply with ack after SIFS. • However, for reducing congestion at the downstream nodes(due to multiple ack) it uses the candidate equivalent backoff (scaled by the number of candidates) • It only requires at least one candidate successfully receives the packet. • Passive Forward Selection • Dynamic assignment of the forwarding responsibility to one node (one node at every point)

  7. TDiCOR (Transmit Diversity based on Cooperative Opportunistic Routing) @ Infocom 08 • Cooperative Data Transmission using transmit diversity • It reduces the waste of network resource at the Passive Forward Selection • However, C2 done not have to receive same data frame D from S1 • Cancelation of non-innovative Transmissions • S1 miss ACK from receivers • It uses two consecutive ACK frame

  8. Results

  9. Conclusion • Conclusion • This paper proposes a cooperative forwarding protocol based on opportunistic routing and transmit diversity. • TDiCOR outperforms traditional routing (DSR) in terms of throughput by 30%(indoor) and by 50%(outdoor) with less complexity • Disscusion • This is only simulation • Without power control and congestion control.

More Related