IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0185859
(1998-11-04)
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발명자
/ 주소 |
- Jarett, Keith
- Williams, Roland E.
- Raffel, Michael A.
- Nelson, Roderick
- Leuca, Ileana A.
- Lee, Tony S.
- Lawrence, Christopher G.
- Kibria, Masud
- Glass, David R.
- Bamburak, Michael D.
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출원인 / 주소 |
- AT&T Wireless Services, Inc.
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
58 인용 특허 :
104 |
초록
▼
A mobile station communicates with both a cellular network, by which it is assigned a mobile identification number, and to a cordless cellular base station utilizing the same cellular frequency range and communications protocol. The cordless cellular base station is preferably connected to a public
A mobile station communicates with both a cellular network, by which it is assigned a mobile identification number, and to a cordless cellular base station utilizing the same cellular frequency range and communications protocol. The cordless cellular base station is preferably connected to a public switched telephone network and is assigned a landline number. The cordless cellular base station acts as a conduit between the mobile station and the public switched telephone network. When the mobile station comes within range of a cordless cellular base station, it deregisters automatically from the cellular network and register with the cordless cellular base station. Once the mobile station is communicating with the cordless cellular base station, the cordless cellular base station communicates with the cellular network to instruct the cellular network to route all calls for mobile identification number to the cordless cellular base station's landline number. In addition, all calls placed on the mobile station are sent through the cordless cellular base station to the public switched telephone network. When the mobile station severs contact with the cordless cellular base station, the mobile station registers with the regional cellular base station of the regional cellular network. The cordless cellular base station then sends a network forwarding cancellation message to the cellular network to cancel the forwarding of calls for the mobile station's identification number. Once the mobile station is registered with the regional cell, calls to the mobile stations identification number are directly routed by the cellular network to the mobile station.
대표청구항
▼
A mobile station communicates with both a cellular network, by which it is assigned a mobile identification number, and to a cordless cellular base station utilizing the same cellular frequency range and communications protocol. The cordless cellular base station is preferably connected to a public
A mobile station communicates with both a cellular network, by which it is assigned a mobile identification number, and to a cordless cellular base station utilizing the same cellular frequency range and communications protocol. The cordless cellular base station is preferably connected to a public switched telephone network and is assigned a landline number. The cordless cellular base station acts as a conduit between the mobile station and the public switched telephone network. When the mobile station comes within range of a cordless cellular base station, it deregisters automatically from the cellular network and register with the cordless cellular base station. Once the mobile station is communicating with the cordless cellular base station, the cordless cellular base station communicates with the cellular network to instruct the cellular network to route all calls for mobile identification number to the cordless cellular base station's landline number. In addition, all calls placed on the mobile station are sent through the cordless cellular base station to the public switched telephone network. When the mobile station severs contact with the cordless cellular base station, the mobile station registers with the regional cellular base station of the regional cellular network. The cordless cellular base station then sends a network forwarding cancellation message to the cellular network to cancel the forwarding of calls for the mobile station's identification number. Once the mobile station is registered with the regional cell, calls to the mobile stations identification number are directly routed by the cellular network to the mobile station. nal; a CPU that receives at least one of the first clock signal from said first oscillator and the second clock signal from said second oscillator, outputs a switching signal to said switching device that repeatedly switches said switching device between the ON state and the OFF state; a first timer that receives the clock signal from the first oscillator and outputs a first timer signal; a second timer that receives the clock signal from the second oscillator and outputs a second timer signal; and a protection circuit that switches said switching device to the OFF state in response to either the first timer signal or the second timer signal, independently of the switching signal from said CPU. 2. A strobe control apparatus according to claim 1, wherein when said switching device is performing its ON/OFF switching operation in accordance with the switching signals from said CPU, and when the switching device has been switched to the ON state for a time period equal to or longer than a predetermined time period after said switching device was changed-over from the OFF state to the ON state, said protection circuit switches said switching device to the OFF state in accordance with the first timer signal or the second timer signal.3. An apparatus according to claim 1, wherein the first oscillator is a high-speed driving oscillator that supplies a first clock signal having a first frequency capable of driving the CPU in a first mode, and the second oscillator is a low-speed driving oscillator that supplies a second clock signal having a second frequency, lower than the first frequency, capable of driving the CPU in a second mode.4. An electrical flash control apparatus comprising: a main capacitor that stores a charge for exciting a flash tube; a switching device having an ON state and an OFF state; a transformer, connected to said switching device, that generates a charging current for charging said main capacitor; a CPU that outputs a switch signal to said switching device that repeatedly switches said switching device between the ON state and the OFF state; a clock circuit that supplies to the CPU a first clock signal having a first frequency capable of driving the CPU in a first mode, and a second clock signal having a second frequency, lower than the first frequency, and capable of driving the CPU in a second mode; a first timer that receives the first clock signal from the clock circuit and outputs a first timer signal; a second timer that receives the second clock signal from the clock circuit and outputs a second timer signal; and a protection circuit that switches said switching device to the OFF state in response to either the first timer signal or the second timer signal, independently of the switching signal from said CPU. 5. A strobe control apparatus according to claim 4, wherein when said switching device is performing an ON/OFF switching operation in accordance with the switching signals from said CPU, and when said switching device has been switched to the ON state for a time period equal to or longer than a predetermined time period after said switching device was changed-over from the OFF state to the ON state, said protection circuit switches said switching device to the OFF state in accordance with the first timer signal or the second timer signal. US-5991324, 19991100, Knowles et al., 372/057; US-5999318, 19991200, Morton et al., 359/572; US-6005880, 19991200, Basting et al., 372/038; US-6014206, 20000100, Basting et al., 356/138; US-6014398, 20000100, Hofmann et al., 372/060; US-6018537, 20000100, Hofmann et al., 372/025; US-6020723, 20000200, Desor et al., 320/166; US-6028872, 20000200, Partlo et al., 372/038; US-6028880, 20000200, Carlesi et al., 372/058; US-6061382, 20000500, Govorkov et al., 372/101; US-6081542, 20000600, Scaggs, 372/070; US-6128323, 20001000, Myers et al., 372/038.1; US-6154470, 20001100, Basting et al., 372/019; US-6157662, 20001200, Scaggs et al., 372/060; US-6160831, 20001200, Kleinschmidt et al., 372/057; US-6160832, 20001200, Kleinschmidt et al., 372/057; US-6243405, 20010600, Borneis et al., 372/025; US-6381256, 20020400, Stamm et al., 372/100; US-6421365, 20020700, Kleinschmidt et al., 372/108; US-6424666, 20020700, Stamm, 372/100; US-6442182, 20020800, Govorkov et al., 372/102
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