Abstract
This paper deals with low earth orbit mobile satellite systems (LEO-MSSs)
belonging to third-generation mobile networks and proposes a novel
packet-access scheme suitable for a hybrid time--code wide-band air
interface. This medium-access control (MAC) protocol is a modification
of the packet-reservation multiple-access scheme with hindering states
(PRMA-HS) and is called code-division PRMA-HS (CD-PRMA-HS). Each
mobile terminal that needs to transmit makes random accesses on available
time--code resources until it receives a positive acknowledgment
from the satellite. Both real-time voice and Web-traffic sources
have been considered in our LEO-MSS scenario. An in-depth analysis
of the random-access phase has been carried out, thus, identifying
the conditions that allow a good CD-PRMA-HS behavior. Finally, a
performance analysis has been developed in order to evaluate the
quality of service parameters for both voice andWebtraffic sources.
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