communication system where communication systems operate conjunctivelyUS5546443 *Oct 26, 1992Aug 13, 1996Ericsson Ge Mobile Communications, Inc.Communication management technique for a radiotelephone system including microcellsUS5548802 *Mar 28, 1995Aug 20, 1996E. F. Johnson CompanyMethod and apparatus for a remote network switch for a land mobile transmission trunked communication systemUS5613196