Remote wireless unit having reduced power operating mode for a discrete multitone spread spectrum communications system
First Claim
1. In a wireless communications network, a method in a base station to communicate with a remote unit that is in a sleep mode, the remote unit having a unique identification value, comprising the steps of:
- establishing a periodic reference instant at the base station and at the remote station;
determining a delay interval following said periodic reference instant at the base station, said delay interval being derived from said unique identification value of said remote unit; and
transmitting a message from the base station to the remote unit at a second instant following said delay interval, said remote unit having changed from said sleep mode to a standby mode after said delay interval.
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Accused Products
Abstract
A remote unit for a personal wireless area network includes a receiver, an AC power supply, a battery-backup power supply and a controller. The battery-backup becomes operative when the AC power supply fails and supplied power to the receiver. The controller detects when the AC power supply fails and controls the receiver and the battery-backup power supply by invoking a sleep mode of operation. The sleep mode of operation is periodically interrupted by the controller controlling the receiver and the battery-backup power supply to enter a standby mode of operation in which the receiver scans for a CONNECT message from a base station indicating an incoming call. The controller coordinates the sleep mode and the standby mode of operations based on a frame count that is generated from an identification number of the remote unit. A highly bandwidth-efficient communications method is employed in the base station to enable it to coordinate communication with the remote unit when it changes from the sleep mode to the standby mode.
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Citations
25 Claims
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1. In a wireless communications network, a method in a base station to communicate with a remote unit that is in a sleep mode, the remote unit having a unique identification value, comprising the steps of:
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establishing a periodic reference instant at the base station and at the remote station;
determining a delay interval following said periodic reference instant at the base station, said delay interval being derived from said unique identification value of said remote unit; and
transmitting a message from the base station to the remote unit at a second instant following said delay interval, said remote unit having changed from said sleep mode to a standby mode after said delay interval. - View Dependent Claims (2, 3, 4, 5)
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6. In a wireless communications network, a method in a base station to communicate with a remote unit that is in a sleep mode, the remote unit having a unique identification value, comprising the steps of:
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establishing a periodic reference instant at the base station and at the remote station;
determining a delay interval following said periodic reference instant at the base station, said delay interval being derived from said unique identification value of said remote unit;
attempting to initiate a communication from said base station to said remote unit;
concluding at the base station that the remote unit is in a sleep mode if said attempting step fails to initiate communications with the remote unit;
waiting for said delay interval following said periodic reference instant at the base station; and
transmitting a message from the base station to the remote unit at a second instant following said delay interval, said remote unit having changed from said sleep mode to a standby mode after said delay interval. - View Dependent Claims (7, 8, 9, 10)
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11. A highly bandwidth-efficient communications method in a base station to communicate with a remote unit that is in a sleep mode, the remote unit having a unique identification value, comprising the steps of:
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establishing a periodic reference instant at the base station and at the remote station;
determining a delay interval following said periodic reference instant at the base station, said delay interval being derived from said unique identification value of said remote unit;
receiving at a base station a spread signal comprising an incoming data traffic signal spread over a plurality of discrete traffic frequencies;
adaptively despreading the signals received at the base station by using despreading weights;
attempting to initiate a communication from said base station to said remote unit;
concluding at the base station that the remote unit is in a sleep mode if said attempting step fails to initiate communications with the remote unit;
waiting for said delay interval following said periodic reference instant at the base station; and
transmitting at the base station to the remote unit a spread signal comprising an outgoing data traffic signal spread over a plurality of discrete traffic frequencies. - View Dependent Claims (12, 13, 14, 15)
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16. A remote unit for a personal wireless area network comprising:
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a receiver;
an AC power supply coupled to the receiver and supplying power to the receiver;
a battery-backup power supply coupled to the receiver, the battery-backup power supply becoming operative to supply power to the receiver when the AC power supply fails; and
a controller coupled to the receiver, the AC power supply and the battery-backup power supply, the controller detecting when the AC power supply fails and in response controls the receiver and the battery-backup power supply by invoking a sleep mode of operation, the sleep mode operation being periodically interrupted by the controller controlling the receiver and the battery-backup power supply to enter a standby mode of operation in which the receiver scans for a CONNECT message indicating an incoming call, the controller controlling the sleep mode and the standby mode of operations based on a frame count that is generated from an identification number of the remote unit. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A method for reducing power consumption of a remote unit in a PWAN system, comprising the steps of:
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powering a remote unit using a battery backup power supply when an AC power supply fails at the remote unit;
entering a sleep mode of operation at the remote unit, the sleep mode having a reduced power consumption for the battery backup power supply;
entering a standby mode of operation at the remote unit a predetermined period of time after entering the sleep mode of operation scanning for a CONNECT message indicating an incoming call for the remote unit; and
reentering the sleep mode of operation when no CONNECT message is received. - View Dependent Claims (23, 24, 25)
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Specification