Data Rate Based Grouping Scheme for Cooperative Communications in Wireless LANs
Authors: Sunmyeng Kim
IEEE 802.11a/b/g standards provide multiple transmission rates, which can be changed dynamically according to the channel condition. Cooperative communications were introduced to improve the overall performance of wireless LANs with the help of relay nodes with higher transmission rates. The cooperative communications are based on the fact that the transmission is much faster when sending data packets to a destination node through a relay node with higher transmission rate, rather than sending data directly to the destination node at low transmission rate. To apply the cooperative communications in wireless LAN, several MAC protocols have been proposed. Some of them can result in collisions among relay nodes in a dense network. In order to solve this problem, we propose a new protocol. Relay nodes are grouped based on their transmission rates. And then, relay nodes only in the highest group try to get channel access. Performance evaluation is conducted using simulation, and shows that the proposed protocol significantly outperforms the previous protocol in terms of throughput and collision probability.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1099954Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1603
 P. Liu, Z. Tao, S. Narayanan, T. Korakis, and S. S. Panwar, “CoopMAC: a cooperative MAC for wireless LANs,” IEEE Journal on Selected Areas in Communications, vol. 25, no. 2, pp. 340-354, Feb. 2007.
 T. Guo and R. Carrasco, “CRBAR: cooperative relay-based auto rate MAC for multi-rate wireless networks,” IEEE Transactions on Wireless Communications, vol. 8, no. 12, pp. 5938-5947, Dec. 2009.
 Cooperative MAC Design in Multi-hop Wireless Networks: Part I: When Source and Destination are within the Transmission Range of Each Other
 X. He and F. Y. Li, “Optimization of the Relay Selection Scheme in Cooperative Retransmission Networks,” IEEE VTC Spring 2011, pp. 1-5, May 2011.
 J. Alonso-Zarate, E. Kartsakli, C. Verikoukis, and L. Alonso, “Persistent RCSMA: a MAC protocol for a distributed cooperative ARQ scheme in wireless networks,” EURASIP Journal on Advances in Signal Processing, vol. 2008, May 2008.
 K. Lu, S. Fu, and Y. Qian, “Increasing the throughput of wireless LANs via cooperative retransmission,” IEEE GLOBECOM ’07, pp. 5231-5235, Nov. 2007.