Downbanded cellular systems and methods

Details Downbanded cellular systems and methods Downbanded cellular systems and methods

1996-03-27

1999-01-19

Chin, Wellington

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

455453, 455509, 370343, H04Q 728

Patent

active

058624864

ABSTRACT:
The present invention provides techniques for adapting the portion of the frequency spectrum allocated to Land Mobile Radio (LMR) for use as downbanded cellular channels. These downbanded cellular channels can be employed, for example, either to supplement a cellular operator's system capacity or as a stand alone cellular-style system which can provide complementary geographic coverage which may, for example, bridge existing Cellular systems. According to a first aspect of the present invention, the conventional channelization of the LMR spectrum is redefined in a manner which provides significant advantages. More specifically, for every six originally specified, 25 KHz LMR channels, five new 30 KHz DBC channels are specified. In this way, complete compatibility with cellular systems, e.g,. allowing roaming between cellular and DBC systems, is achieved according to the present invention.

REFERENCES:
patent: 4914651 (1990-04-01), Lusignan
patent: 5119397 (1992-06-01), Dahlin et al.
patent: 5371898 (1994-12-01), Grube et al.
patent: 5497503 (1996-03-01), Rydberg et al.
Electronics & Communications In Japan, "Method of Rejecting Channel Interference Using an Adaptive Equalizer", Part 1, vol. 72, No. 11, Nov. 1989, pp. 1-10.
PCT International Search Report for International Application No. PCT/US 97/03808, dated Jun. 30, 1997.

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