Title :
Improvement of slotted Aloha for land-mobile satellite communications, using channel state information
Author :
Jahn, Axel ; Böttcher, Axel
Author_Institution :
DLR-German Aerosp. Res. Establ., Wessling, Germany
Abstract :
A slotted Aloha based modified channel access strategy for highly unreliable channels is proposed and investigated. It requires all mobile stations to estimate the link quality before starting a transmission. Transmissions are postponed when the link quality is poor. The performance of this modification is evaluated using a hybrid simulation tool. Measured channel data are included. The most important result is that slotted Aloha can be significantly improved when the users make use of information about the link quality. Then, slotted-Aloha outperforms collision-free multiple-access protocols
Keywords :
access protocols; fading; hybrid simulation; land mobile radio; mobile satellite communication; state estimation; telecommunication network reliability; time-varying channels; channel state information; highly unreliable channels; hybrid simulation; land-mobile satellite communications; link quality; modified channel access strategy; slotted Aloha; Access protocols; Channel state information; Communications technology; Delay; Error probability; Fading; Feedback; Satellite broadcasting; Satellite communication; Shadow mapping;
Conference_Titel :
Vehicular Technology Conference, 1993., 43rd IEEE
Conference_Location :
Secaucus, NJ
Print_ISBN :
0-7803-1267-8
DOI :
10.1109/VETEC.1993.507207
