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US 5,862,486 AGranted
Downbanded cellular systems and methods
AssigneeEricsson Inc.
InventorThomas A. Przelomiec
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AssigneeEricsson Inc.
InventorThomas A. Przelomiec
Estimating the term…
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.
A method for using an LMR portion of a frequency spectrum, which LMR portion is typically used to provide transmission trunked communication on channels having 25 KHz bandwidths, to instead provide downbanded cellular radiocommunication service, the method comprising the steps of:
A method for providing downbanded cellular (DBC) radiocommunications services comprising the steps of:
Dependencies are inferred from the claim text.