WONS 2004

Madonna di Campiglio
(Trento, Italy)

January 21-23, 2004

First Working Conference
Wireless On-demand Network Systems

(sponsored by IFIP WG 6.3 and 6.8)

Media Access Control Schemes for Mobile Ad Hoc Networks

Chunhung Lin (National Sun Yat-Sen University),
Chien-yuan Liu (National Sun Yat-sen University)

Abstract - Multi-rate capabilities are supported by the physical layers of most 802.11 devices. To enhance the network throughput of MANETs, transfer rate adaptation at MAC layer should employ the multi-rate capability at physical and the information of previous transmissions provided by MAC and physical layers. In this paper, we propose a transfer rate adaptation scheme plus back-to-back frame transmissions, and fragmentation at MAC layer, named TRAF. TRAF adopts a bi-direction-based approach with an extended option to select an appropriate rate for frame transmission under fast changing channel conditions. Consecutive back-to-back frame transmissions to fully utilize good channel quality during a coherent time interval and fragmentation algorithm to maintain high throughput under worse channel conditions are recommended in TRAF. Extensive simulation is experimented to evaluate the performance of TRAF. Regarding simulation results, frame delivery ratio, and network throughput of TRAF are significantly improved by comparing to that of other protocols.
Published in:
Wireless On-Demand Network Systems
Proceedings of WONS2004
Lecture Notes in Computer Science LNCS2928, Springer 2004.

Pages 56-71

To browse the conference proceedings, please go to the Springer's LNCS2928 Page.