Methods and apparatus for contingency communications
First Claim
1. A portable device configured to connect to a long-term evolution (LTE) system, using a multi-frame structure, wherein a frame contains a plurality of subframes and a subframe contains a plurality of orthogonal frequency division multiplexing (OFDM) symbols, the portable device comprising:
- a receiver configured to receive an LTE signal from an LTE base station; and
a transmitter configured to repeatedly transmit an LTE primary synchronization signal over multiple consecutive OFDM symbols in an assigned transmission subframe, wherein the LTE primary synchronization signal contains a Zadoff-Chu sequence.
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Accused Products
Abstract
Methods and systems for contingency communication are disclosed. In one embodiment, a method for providing emergency services may be performed by a base station operating in a communication system In an embodiment, the method for providing emergency services includes transmitting a beacon signal to indicate an emergency status to enable portable devices to operate in a stress mode. A distress signal may be transmitted by a mobile device in response to the beacon signal to the base station, wherein the distress signal carries information at least comprising user identity associated with the mobile device, geolocation of the mobile device, or biometrics of a user of the mobile device.
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Citations
15 Claims
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1. A portable device configured to connect to a long-term evolution (LTE) system, using a multi-frame structure, wherein a frame contains a plurality of subframes and a subframe contains a plurality of orthogonal frequency division multiplexing (OFDM) symbols, the portable device comprising:
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a receiver configured to receive an LTE signal from an LTE base station; and a transmitter configured to repeatedly transmit an LTE primary synchronization signal over multiple consecutive OFDM symbols in an assigned transmission subframe, wherein the LTE primary synchronization signal contains a Zadoff-Chu sequence. - View Dependent Claims (2, 3, 4, 5)
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6. A method for a mobile device connected to a long-term evolution (LTE) system using a multi-frame structure, wherein a frame contains a plurality of subframes and a subframe contains a plurality of orthogonal frequency division multiplexing (OFDM) symbols, the method comprising:
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receiving an LTE signal from an LTE base station in the LTE system; and repeatedly transmitting, by the mobile device, an LTE primary synchronization signal containing a Zadoff-Chu sequence over multiple consecutive OFDM symbols in a transmission subframe assigned by the LTE system. - View Dependent Claims (7, 8, 9, 10)
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11. A communications device comprising a processor and memory storing thereon executable instructions that, when executed by the processor, cause the communications device to:
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receive an LTE signal from an LTE base station in an LTE system, the LTE system employing a multi-frame structure, wherein a frame contains a plurality of subframes and a subframe contains a plurality of orthogonal frequency division multiplexing (OFDM) symbols; and repeatedly transmit an LTE primary synchronization signal over multiple consecutive orthogonal frequency division multiplexing (OFDM) symbols in a transmission subframe assigned by the LTE system that is in communications with the communications device, wherein the LTE primary synchronization signal contains a Zadoff-Chu sequence. - View Dependent Claims (12, 13, 14, 15)
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Specification