Land Mobile Communications Satellite Missions (LAMOCOSAMIS) Task 2: Functional Requirements

摘要

Existing, planned, and foreseeable land mobile communication services in Europe were reviewed. Functional characteristics of available and new services were studied. Assumptions on global architecture were made. Regulatory aspects were investigated. The system should offer two-way telephony with the same quality as for the wire network; continous coverage, except in the low population density area, and including coverage of the coastal area; at least 10 Erlangs/sq km, allowing for a 25 mE per subscriber to serve 400 subscribers/sq km; possibility to call a mobile subscriber without knowing its geographical position, switched-on mobile terminal being permanently located by the system (roaming); automatic switchover of calls without break when a mobile moves from one cell to another (handover); service to users of public transport; possibility to use portable or pocket mobile terminal; and data transmission either by using a modem on the actual analog systems, or directly on the future digital systems, allowing message transmission or facsimile, connection of computer or terminals, with the possibility of integration in the future Integrated Service Digital Network.