Stochastic modelling and analysis: a computational approach
Stochastic modelling and analysis: a computational approach
Optimal policies for handoff and channel assignment in networks of LEO satellites using CDMA
Wireless Networks - Special issue: hybrid and satellite communication networks
A modified CDMA/PRMA medium access control protocol for integrated services in LEO satellite systems
WOWMOM '00 Proceedings of the 3rd ACM international workshop on Wireless mobile multimedia
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Efficient policies are derived for admitting voice and data traffic into networks of low-earth-orbit (LEO) satellites using code-division multiple-access (CDMA) with direct-sequence spread-spectrum (DS/SS) signaling. The satellites act as bent-pipes; no on-board processing or intersatellite links are present. Dual satellite diversity is used to mitigate the effects of shadowing. The policies assume a movable boundary form, allocate optimally the CDMA capacity (PN codes) to voice and data users, and can increase significantly the number of users served while satisfying their bit error rate (BER) requirements. In contrast to direct admission policies that do not take into consideration the statistical features of the traffic, the new policies do account for the different nature of voice and data traffic and the history of prior transmissions/admissions. Two priority schemes are considered: voice users have higher priority than data users, or voice and data users have the same priority. A modified version of our policies can handle two classes of data users: one with high priority which requires real-time delivery and another with low priority that can be queued; the BER requirements of the two data types may differ. Optimal policies have lower voice blocking rates and data packet error rates than direct admission policies.