Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1997-11-03
1998-12-08
Hudspeth, David R.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455446, 455428, 455422, 455431, H04Q 700
Patent
active
058483594
ABSTRACT:
A cellular system (FIG. 4) is expanded to allow communication between mobile ground-based units (70 and 72) and mobile air-based units (80 and 78) where the air base units (e.g., a unit in airplane 78) operate above a threshold elevation. Mobile units below the threshold elevation level use local conventional cellular service area and cells whereas mobile units above the threshold are transferred to a frequency reuse pattern having a higher altitude of service and a larger service surface area. Switching between the air cells (41a-41g) and the land cells (26) is performed by determining if two land cell controllers operate at a same frequency both are receiving transmission from the mobile unit. If two land cells of the same frequency receive the same mobile unit transmission, then the mobile unit is above the threshold elevation and assigned to an air cell, else a land cell is used.
REFERENCES:
patent: 5067172 (1991-11-01), Schloemer
patent: 5123112 (1992-06-01), Choate
patent: 5289527 (1994-02-01), Tiedemann, Jr.
patent: 5365571 (1994-11-01), Rha et al.
patent: 5519761 (1996-05-01), Gilhousen
patent: 5557656 (1996-09-01), Ray et al.
patent: 5574968 (1996-11-01), Olds et al.
Abebe Daniel
Hudspeth David R.
Motorola Inc.
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