05343512 is referenced by 92 patents and cites 27 patents.

A distributed communication network includes switching offices (SOs), moving-orbit satellites, and subscriber information managers (SIMs). A population of mobile units (MUs) communicates through the network. A MU automatically determines its location and communicates with the network so that this information is kept current at a SO serving the MU and at a home SIM for the MU. The terrestrial nodes of the network have information showing which MUs are logged on at any given time. This knowledge is used to block calls to MUs known to be logged off. Calls are setup through cooperation between SOs. When calls are being setup to MUs, call-originating SOs determine appropriate SIMs and obtains the current location of the MUs from those SIMs. This current location corresponds to a call-destination SO with which the originating SO may cooperate in setting up a call.

Title
Call setup method for use with a network having mobile end users
Application Number
7/859206
Publication Number
5343512
Application Date
March 27, 1992
Publication Date
August 30, 1994
Inventor
Steven H Moritz
Phoenix
AZ, US
Raymond J Leopold
Colorado Springs
CO, US
Theresa C Y Wang
Scottsdale
AZ, US
Agent
Robert M Handy
Frederick M Fliegel
Harold C McGurk
Assignee
Motorola
IL, US
IPC
G01S 3/02
H04B 1/00
H04B 7/185
H04M 11/00
View Original Source