Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
1999-06-28
2001-02-20
Trost, William G. (Department: 2681)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S067700, C455S453000
Reexamination Certificate
active
06192247
ABSTRACT:
FIELD OF THE INVENTION
The invention relates generally to communication systems, and more particularly to a method for extending the cell radius between a mobile station and a base station.
BACKGROUND OF THE INVENTION
In current cellular communication systems, a mobile station communicates with a base station. The mobile station must be located within a predetermined distance from the base station. In IS-95 cellular systems, an implementation limitation of 55 kilometers has been set. Consequently, a mobile station must be within 55 kilometers in order to communicate with a base station.
When a mobile station is distant from its serving base station, the propagation delay can become significant. If the power at the mobile station is sufficient to reach the base station, the limitation comes from the ability of the base station to find the signal transmitted by the mobile station from the distant location. In IS-95 systems, a base station typically searches for energy within an interval of +/−226 PN chips, which translates to about 0.184 ms. This corresponds to a distance of about 55.176 km. Beyond this distance, the searcher can not see the mobile station's transmitted signal.
However, when the mobile station has enough power to reach the base station, the inability to communicate is caused by the inability of the base station to find the signal within a predetermined search window. Thus, a need exists for a method for extending the cell radius between a mobile station and a base station.
REFERENCES:
patent: 4850032 (1989-07-01), Freeburg
patent: 5471649 (1995-11-01), Rees et al.
patent: 5485632 (1996-01-01), Ng et al.
patent: 5625627 (1997-04-01), Ishi
patent: 5678193 (1997-10-01), Helm et al.
patent: 5831974 (1998-11-01), Suonvieri
patent: 6061565 (2000-05-01), Innes et al.
Dillon Matthew James
Nedelcu Bogdan Romulus
Craver Charles
Haas Kenneth A.
MacIntyre John B.
Motorola Inc.
Trost William G.
LandOfFree
Method for extending the cell radius between a mobile... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for extending the cell radius between a mobile..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for extending the cell radius between a mobile... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2609014