Jerol M Lind

US Patent:

44750102, Oct 2, 1984

Filed:

May 5, 1983

Appl. No.:

6/491905

Inventors:

George D. Huensch - Aurora IL
Robert L. Lien - Batavia IL
Jerol M. Lind - Wheaton IL
Verne H. MacDonald - Elberon NJ

Assignee:

AT&T Bell Laboratories - Murray Hill NJ

International Classification:

H04Q 704

US Classification:

179 2EB

Abstract:

In a cellular mobile telecommunication system, a method and apparatus for controlling the process of locating a mobile unit from the cell sites. When a mobile unit goes beyond the radio range of its associated controlling cell site, that cell site sends a message to nearby cell sites to measure and report the strength of the received signal from that mobile on each of their directional antennas and to report radio channel availability. These reports are returned to the controlling cell site which compares the received signal strength mesurements against stored thresholds. The controlling cell site generates and transmits to the mobile telecommunications switching office (MTSO) a hand-off request message including a list of candidate hand-off cell sites and directional antennas. The MTSO then selects an available channel associated with one of the candidate cell sites and antennas and generates a sequence of messages to hand-off communications control from the controlling cell site to a candidate cell site.