Collaborative MAC Protocols

In ad hoc networks, multi-hop routing is used to deliver messages from a source to a destination. In the conventional approach, if a packet is not successfully delivered then the desired recipient will transmit back a negative acknowledgment (NACK) or fail to transmit a positive acknowledgment (ACK). However, other neighbors of the transmitting radio may have successfully received the packet and thus may be able to relay that message on to the desired recipient. By allowing these radios to act as relays for the packet, cooperative diversity can be achieved. In this research, we develope MAC protocols to provide such cooperative diversity.

Sponsors: NSF and ONR

Publications

  1. J. M. Shea, T. F. Wong, and W.-H. Wong, "Cooperative Diversity Slotted ALOHA," ACM Wirless Networks, Sep. 2005. Invited paper. Accepted for publication.
  2. W.-H. Wong, J. M. Shea, and T. F. Wong, "Cooperative Diversity Slotted ALOHA," in Proceedings of the 2nd International Conference on Quality of Service in Heterogeneous Wired/Wireless Networks (QShine), Orlando, FL, Aug. 2005.

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Last modified: 11/10/02