Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Patent
1997-02-06
2000-07-04
To, Doris H.
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
455343, H04B 116
Patent
active
060851147
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.
REFERENCES:
patent: 5361397 (1994-11-01), Wright
patent: 5509015 (1996-04-01), Tiedemann, Jr. et al.
patent: 5745860 (1998-04-01), Kallin
patent: 5752202 (1998-05-01), Obright
Vandendorpe L. et al.: "Analysis of Residual Interference After MSE Linear Equalization of Multitone Spread Spectrum Signals", Communications--Gateway to Globalization Proceedings of the Conference on Communications, Seattle, Jun. 18-22, 1995, vol. 3, pp. 1673-1677.
Vandendorpe L. et al.: "Performance Analysis of Linear Joint Multiple Access Interference Cancellation-Equalization for Asynchronous Multitone CDMA" IEEE, Sep. 25, 1995, pp.537-541, XP000610292.
Gibbons David
Golden James Timothy
AT&T Wireless Systems Inc.
To Doris H.
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