Telecommunications – Transmitter and receiver at separate stations
Patent
1996-01-04
1997-06-17
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
455 541, 455 62, 4551662, H04B 726
Patent
active
056406754
ABSTRACT:
Periodically, when a mobile is in its normal mode of operation, a first list of control frequencies transmitted by respective base stations of the geographical area in which the mobile is located is stored in a SIM card and a second list of control frequencies and associated respective maximal second receive levels measured by the mobile is stored in RAM. In response to being switched on, the mobile measures a first receive level for each of the control frequencies defined in the network and a comparator compares the first and second receive levels for each of the control frequencies of the second list, to assess movement of the mobile. To synchronize to a given network constituting a subnetwork of the radio communication network, the mobile uses the control frequencies defined in the radio communication network or the control frequencies from the first list, respectively, according to whether the mobile has moved or not.
REFERENCES:
patent: 5189413 (1993-02-01), Gaskill et al.
patent: 5517677 (1996-05-01), Moon
Mouly et al, "GSM System for Mobile Communications", Europe Media, 1993, pp. 456-458.
Jouin Christophe
Pinault Francis
Alcatel Mobile Phones
Eisenzopf Reinhard J.
Kincaid Lester G.
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