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Voltage-standing-wave-ratio-measurement-apparatus-and-use-in-a-cellular-communications-system

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Voltage standing-wave ratio measurement apparatus and use in a cellular communications system

Details

Inventors: Finnell, John Fitzgerald; Groves, Thomas Paul; Bishop, Peter William;
Assignee: Motorola, Inc. (Schaumburg, IL)
Primary Examiner: Trost; William
Assistant Examiner: Zeawdu; Meless
Attorney, Agent or Firm:

An apparatus for monitoring a cellular communications system; comprising a plurality of voltage standing-wave ratio (VSWR) measurement means located at respective connections to antennas of said communications system and at respective discontinuities in radio transmission lines to said distributed antennas; wherein each said VSWR measurement means is individually identifiable, has a respective threshold, and is arranged to compare its measured VSWR value to its respective threshold and identifiably indicate an error status if its measured VSWR value exceeds its threshold. Also described is a corresponding method of monitoring a cellular communications system. Also described is a VSWR measurement apparatus, and an antenna arrangement comprising an antenna and such a VSWR measurement apparatus.

DETAILED DESCRIPTION The present invention addresses some or all of the above disadvantages by providing apparatus for detecting a fault in a system such as a cellular communications system and which apparatus includes voltage standing-wave ratio (VSWR) measurement apparatus.
The present invention advantageously allows for sensitive monitoring at different points along a radio transmission line, to a sensitivity level improved over what would be the case if only the whole link could be monitored as one item.
Also, the present invention usefully indicates the location within the system of an irregular VSWR measurement.
This is particularly useful in systems with distributed antennas, such as a system incorporating an in-building picocellular arrangement.
The present invention also facilitates different threshold settings at different locations, accommodating different contributions of reflective power at different stages of a radio transmission line.
Additional specific advantages are apparent from the following description and figures which relate to a merely exemplary embodiment of the present invention.

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