Back to results
US 5,479,595 AGranted
Mobile telephony system
AssigneeTelefonaktiebolaget LM Ericsson
InventorPer V. Israelsson
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeTelefonaktiebolaget LM Ericsson
InventorPer V. Israelsson
Estimating the term…
A mobile telephony system intended for use by outdoor subscribers, for instance in cars, while affording, at the same time, high traffic capacity and relatively disturbance-free speech transmission to subscribers located within a building, for instance an office building. Signal transmission between mobile stations (MS, MSI) and base stations (BS1, BSI) is effected with radio waves in a first part-system (7), for instance intended for telephony traffic via car telephones, and with light, at least in the area nearest the mobile stations (MSI), in a second part-system (6) intended, for instance, for an office building. Signal transmission with light can also be effected in areas that contain electronic apparatus which is sensitive to radio disturbances, for instance in hospitals and/or in areas in which strong radio disturbances capable of preventing mobile telephony transmission with radio waves occur. Certain mobile stations may be capable of being switched between signal transmission with radio waves and signal transmission with light, which enables these stations to be used in both part-systems (7, 6).
A mobile telephony system comprising mobile stations and base stations, intended for use in areas which are normally relatively different with regard to the required traffic capacity, sensitivity to radio disturbances and the occurrence of radio disturbances, comprising a first part-system (7) intended for use in areas populated by vehicular mobile stations, and a second part-system (6) intended for use in buildings;
Dependencies are inferred from the claim text.