Technique for efficient spectrum utilization in mobile radio systems using space diversity

Patent 4355411 Issued on October 19, 1982. Estimated Expiration Date:

June 22, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3310741

3582787

3913017

Method and apparatus for radio system cochannel interference suppression
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Inventor: Addeo

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Cellular radiotelephone system structured for flexible use of different cell sizes
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Inventors

Assignee

Bell Telephone Laboratories, Incorporated

Application

No. 06/276255 filed on 06/22/1981

US Classes:

455/437, Mobile assisted or initiated455/504Fading compensation

Examiners

Primary: Bookbinder, Marc E.

Attorney, Agent or Firm

Pfeifle; Erwin w.

International Classes

H04B 7/26 (20060101)
H04Q 7/36 (20060101)

Abstract

The present invention relates to a technique for efficient spectrum utilization in mobile radio systems divided into a plurality of geometrically-shaped cells (10-21). Mobiles (24) in each cell are served by at least one base station (30-40) comprising a directional antenna having a beamwidth corresponding to the overall area of the associated cell. Each base station communicates with mobiles within the associated cell using separate primary channels (Cp) within a first portion of the system frequency spectrum when a mobile is not experiencing interference above a predetermined interference level, and switches a mobile to a separate secondary channel (Cp) within a selected section (f1, f2, f3) of the remaining second portion (fi) of the system frequency spectrum when the interference at a mobile exceeds the predetermined interference level. Each selected section used in adjacent portions of adjacent cells being within a different frequency subband of the second portion.

Other References

"The Cellular Concept"-V. H. MacDonald-B.S.T.J., vol. 58, No. 1, Jan. 1979, pp. 15-41
"Cell Site Hardware"-N. Ehrlich et al.-B.S.T.J., vol. 58, No. 1, Jan. 1979, pp. 153-173
"Efficient Spectrum Utilization for Mobile Radio Systems Using Space Diversity"-Y. S. Yeh et al., Int'l. Conf. on Radio Spectrum Conservation Techniques, London, England, Jul. 7-9, 1980, pp. 12-16