Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1996-11-06
1999-07-13
Wolfe, Willis R.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455 674, 455424, 455561, 379 21, H04B 1700
Patent
active
059240296
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a mobile radio communications system, more particularly, a communications system formed by cordless telephones for a private branch exchange, which system comprises at least a base station to be connected to a data interface, and at least a mobile station.
The invention further relates to a base station, a mobile station and a measuring case for such a mobile radio communications system.
BACKGROUND OF THE INVENTION
Such a mobile radio communications system is used, for example, in so-called in-house radio networks. A plurality of base stations instead of conventional telephone sets or in combination with them can then be connected to a private branch exchange. The base stations make the connection possible to a plurality of cordless telephones within the radio coverage area of the base stations. The coverage of such base stations is generally about 50 to 300 meters depending on the radio environment. For larger complexes of buildings and office or factory sites which are to be covered by such a mobile radio communications system, the problem occurs that, already in the planning phase of the mobile radio communications system, there has to be determined where and how many base stations are necessary for covering the complex of buildings or the office or factory site.
Such a mobile radio communications system is known from EP 0 565 150 A1.
SUMMARY OF THE INVENTION
It is the object of the invention to provide a mobile radio communications system of the type defined in the opening paragraph, which makes a measurement of the mobile radio communications system possible in a simple manner.
This object is achieved in a mobile radio communications system of the type defined in the opening paragraph, in that the base station includes detection means for detecting whether the data interface is connected to a data line and in that the base station includes transmitter means for transmitting a test signal to the mobile station when there is detected that the data interface is not connected to a data line.
The invention is based on the recognition that when such a mobile radio communications system is planned, the complex of buildings or the office or factory site to be covered by radio often does not yet comprise the necessary infrastructure for connecting the base station or the base stations to a switching center, because, for example, the building is only finished as a carcass building. Thus, in many cases, regular operation of a switching center with cordless telephones cannot possibly be tested. An effective measurement of the radio coverage area is then made possible in that the base station or base stations are only connected to an internal or external power supply. The base station then detects that there is no regular operation in a switching center and changes to a test mode in which it sends out a test signal. Via an accordingly arranged mobile station for receiving and detecting the test signal, the radio coverage area to be screened can now be detected and be optimized by purposefully locating further base stations until a complete radio coverage of the area is ensured. The basis for the planning or completion of such a mobile radio communications system may then be inexpensive standard components, in which the base station only needs to have the detection means and the mobile station needs to have the means for detecting the test signal transmitted by the base station. As a result, a reliable, simple and cost-effective dimensioning of the mobile radio communications system is made possible. The use of standard components furthermore enables the service engineer working on the spot, who is responsible both for covering existing mobile radio communications systems and planning new mobile radio communications systems, only needs to have one set of measuring equipment. As a rule, this is a measuring case which can be used both for testing communications systems which already exist and for measuring mobile radio communications systems which are to be plann
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Schroter Andreas
Sohngen Burkhard
Halajian Dicran
U.S. Philips Corporation
Vo Hieu T.
Wolfe Willis R.
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