Mobile/Personal Satcoms System Alternatives — Satellite and Network Aspects

Abstract

Present satellite networks are built up as extension to public networks. They provide subscriber access via satellite for those areas where telecommunications do not exist. The switching functions are relatively simple, the radio interfaces have high signal delay and require high power. Such systems will not be acceptable in a future in which personal and mobile communications dominate the wireless market in many countries of the world. Subscribers will compare with mobile standards like GSM expecting a higher level of service. If such a level can be achieved with satellites the demand for satellite based Personal Communications Networks (PCNs) will increase. The targets should be: Global coverage, personal numbering/roaming, voice and data, pager services, handhelds and lower tariffs.