Multiplex communications – Wide area network – Packet switching
Patent
1993-10-22
1995-05-02
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 953, 455 62, 455 63, 455 671, 379 59, H04Q 700, H04B 726, H04B 1500
Patent
active
054126584
ABSTRACT:
A system for spectrum sharing between a point-to-point microwave system and a TDM/TDMA wireless communications system in a common geographical area is described. Each transmitter/receiver in the point-to-point microwave system transmits, in addition to its normal information signal, a beacon signal which is uniquely associated with the receiver receive frequency. In selecting uplink and downlink frequencies for port assignment, each port monitors the beacon frequencies and selects as uplink and downlink frequencies, frequencies which associated beacons fall below a predetermined threshold. Similarly, before accessing the wireless communications system through a selected port, a portable monitors the beacons associated with the selected port's uplink frequency. If the beacon associated with the uplink frequency exceeds a threshold, the portable selects an alternate port through which to access the network. Also, during a call an emergency link transfer to another port is made if the monitored beacon corresponding to the portable's uplink frequency rises above the threshold.
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Arnold Hamilton W.
Devasirvathan Daniel M.
Sollenberger Nelson R.
Sutliff Larrie G.
Varma Vijay K.
Bell Communications Research Inc.
Gurey Stephen M.
Jung Min
Olms Douglas W.
Suchyta Leonard Charles
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