Apparatus and method for adapting a digital radiotelephone system to increased subscriber traffic

Patent 5649299 Issued on July 15, 1997. Estimated Expiration Date:

July 15, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

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Inventors

Assignee

Motorola, Inc.

Application

No. 144166 filed on 10/27/1993

US Classes:

455/62, Optimum frequency selection370/311, Signaling for performing battery saving375/222, Modems (data sets)455/574Power conservation

Examiners

Primary: Urban, Edward F.

Attorney, Agent or Firm

Warren; Raymond J.

International Class

H04Q 007/32

Abstract

A digital radiotelephone system employs vocoders to convert between analog speech and a digital format suitable for transmission via radio. Under most circumstances, the highest data rate is selected for optimum audio quality. When the system occupancy exceeds a particular threshold, as detected at the fixed site of the system, some or all of the vocoders are instructed to switch to a lower data rate to provide for an increase in the number of communication channels. Further, a portable subscriber unit may autonomously change its vocoder data rate depending upon the charge state of its battery.