Patent number: 5195090
Abstract: A wireless-access communications system, such as a CDMA cellular radio-telephone system (FIG. 2), comprises a packet-switched communications network (202, 207, 201) that interconnects cells (base stations; 202) with each other and with the public telephone network (100). Traffic of individual calls is packetized, and packet-bearing frames (300 in FIG. 7) of a plurality of calls are then statistically multiplexed and frame-relayed through the network to yield the high capacity, efficiency, and speed of traffic transport and handoff required for a CDMA cellular system. At each call processing unit (264 in FIG. 5), individual calls are handled by individual service circuits (602 and 612) which perform speech-processing functions such as coding and decoding, tone insertion, and echo cancellation, and packet-to-circuit-switched-PCM traffic conversion.
Type:
Grant
Filed:
July 9, 1991
Date of Patent:
March 16, 1993
Assignee:
AT&T Bell Laboratories
Inventors:
Brian D. Bolliger, Talmage P. Bursh, Jr., Marc K. Dennison, Michael J. English, Charles Y. Farwell, Michel L. Hearn, Richard M. Heidebrecht, Kelvin K. Ho, Kenneth Y. Ho, David M. Kissel, Paul E. Miller, Richard D. Miller, Alan S. Mulberg, LaJeana N. Roberts, Michael A. Smith, Kenneth F. Smolik, Douglas A. Spencer, Kenneth W. Strom, John S. Thompson, Richard A. Windhausen