Wireless access telephone-to-telephone network interface architecture

US5305308A · kind A · utility

Assignee

• AT&T Bell Laboratories · US

Inventors

• Michael J. English · Aurora, US
• Charles Y. Farwell · Denver, US
• Michael Lee Hearn · Broomfield, US
• Richard M. Heidebrecht · Boulder, US
• David M. Kissel · Boulder, US
• Paul E. Miller · Tacoma, US
• Richard D. Miller · Yellow Springs, US
• Alan Stuart Mulberg · Denver, US
• Michael A. Smith · Pittsburgh, US
• Douglas A. Spencer · Boulder, US
• John S. Thompson · Oxnard, US
• Richard A. Windhausen · Boulder, US

Key dates

• Filing date: Oct 29, 1992
• Grant date: Apr 19, 1994
• Expiry date: Oct 29, 2012

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04J3/0632
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

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 & 612) which perform speech-processing functions such as coding and decoding, tone insertion, and echo cancellation, and packet-to-circuit-switched-PCM traffic conversion. Processors (602) adapt call processing unit timing to compensate for asynchrony between cells and call processing units and variations in call path transmission delays. Cell-to-cell communications, fixed call path addressing, and packetized control message transfers ensure that the same service circuit handles a call through even multiple so…