Abstract
The third generation UMTS (Universal Mobile Telecommunication System) provides worldwide multimedia wireless services in a host of environments encompassing indoor picocells to satellite megacells. The UMTS and Satellite-UMTS consists of two modes, a frequency division duplex (FDD) mode and a time division duplex (TDD) mode. The agreement recommends the use of Wideband Code Division Multiple access (WCDMA) for FDD and Time Division-Code Division Multiple Access (TD-CDMA) for TDD mode. In this article two MAC (Medium Access Control) protocols are compared analytically and by simulation for LEO (Low Earth Orbit) satellite used in UMTS. The goal of this comparison is to choose the protocol that benefits from efficient statistical multiplexing on the large common pool of available resources.Key wordssatellite-UMTSLEOMACPRMACDMA
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