H - Electricity – 04 – B
Patent
H - Electricity
04
B
363/2
H04B 7/26 (2006.01) H04Q 7/38 (2006.01)
Patent
CA 1272816
ABSTRACT Method of and circuit arrangement for switching-through a radio connection to another radio cell of a digital radio transmission system. Base radio stations are spatially arranged in a radio transmission system in accordance with a cellular system, separating the message transmission channels from adjacent base stations being effected either by using the frequency-division multiplex method or by using the code- division multiplex method or by using a combination of these multiples methods. In appropriately large spatial distances the same set of channels can be repeated in a further radio cell. If a mobile radio station moves during the conversation from one radio cell into another, then it is necessary to switch-through the then existing radio connection. Additional receivers are provided in the base stations and after comparing the receiving voltages at the output of the additional receivers, a switch is made, when a predetermined threshold value is fallen short off, to that additional receiver at whose output the highest receiving voltage is found. To avoid the necessity of using such additional receivers in each base station and to prevent a repeated switch forward and back in the event of high co-channel interferences the measurements to be effected for the radio cell allocation and consequently for the switch-through decision are effected in the mobile radio station. In that situation the reception quality of the co-channel message transmission channels of remote base stations are additionally measured in the mobile station during the existence of a radio connection to a near base station.
531224
Fetherstonhaugh & Co.
Koninklijke Philips Electronics N.v.
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