Nuruddin S Ladhani

US Patent:

6714795, Mar 30, 2004

Filed:

Jun 26, 2000

Appl. No.:

09/603099

Inventors:

Earle G. Long - Chesterfield MO
Michael H. Retzer - Palatine IL
Nuruddin Ladhani - Chicago IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 700

US Classification:

455518, 455519, 455520, 455515, 455416

Abstract:

A one-to-many dispatch method for use in a TDMA or other wireless telephone system. The one-to-many dispatch call is placed by sending a Request message from a Personal Station PS to a Control Center Station (CS) which assigns a channel with an Assignment message. The PS sends a call setup message over the control channel resulting in a channel assign message being broadcast repeatedly. Call connect messages over the Assigned Channel AC are also repeated from the CS to indicate the open connection. A hang timer is started when the PS ceases transmission of voice and the connection is torn down upon expiry of the hang timer unless another PS transmits a call setup message on the Assigned Channel AC before the expiry of the hang timer.