[54] MULTIPROTOCOL MOBILE TELEPHONE NETWORK HAVING HIGH TIER AND LOW TIER SYSTEMS
[75] Inventors: Enrique Laborde, Gaithersburg;
Lenard S. Golding, Potomac, both of
Md.
[73] Assignee: Hughes Electronics Corporation, Los
Angeles, Calif.
[21] Appl. No.: 680,896
[22] Filed: Jul. 16, 1996
Related U.S. Application Data
[63] Continuation of Ser. No. 312,916, Sep. 30,1994, abandoned.
[51] Int. CI. II04Q 7/22
[52] U.S. CI 455/444; 455/445; 455/448
[58] Field of Search 455/69, 126, 127,
455/74, 444, 445, 448, 507, 517, 524, 526;
379/58, 59, 63; 375/200-205, 220
[56] References Cited
U.S. PATENT DOCUMENTS
4,989,230 1/1991 Gillig et al 455/74
