H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 7/26 (2006.01) H04B 10/22 (2006.01) H04Q 7/36 (2006.01)
Patent
CA 2045301
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 and base stations is effected with radio waves in a first sub-system for instance intended for telephony traffic via car telephones, and with light, at least in the area nearest the mobile stations, in a second sub-system 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 subsystems.
Israelsson Per Viktor
Marks & Clerk
Telefonaktiebolaget Lm Ericsson
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