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Spread-spectrum based cellular mobile radio system, and a control arrangement, a radio based station, and a mobile radio station
| Details |
Inventors: Duque-Anton, Jesus-Manuel; Kunz, Dietmar W.; Ruber, Bernhard J.; Ullrich, Meinhard D.;
Assignee: U.S. Philips Corporation (New York, NY)
Primary Examiner: Pham; Chi H.
Assistant Examiner: Webster; Bryan
Attorney, Agent or Firm:
A spread-spectrum based cellular mobile radio system resolves average mutual interferences (I.sup.u (j).sub.av, I.sup.d (j).sub.av) between radio zones j, j') from a total interference experienced in a radio zone (j), using statistical methods. First, interference measurements are carried out in the radio zones (Z1, Z2), and data is transmitted to a central control arrangement (CA) which resolves the average mutual interferences. Then, these average mutual interference (I.sup.u (j).sub.av, I.sup.d (j).sub.av) are used in an optimization process for acquiring access control parameters (x) for controlling traffic per radio zone (Z1, Z2). In the optimizing process various objective functions may be applied so as to fulfil system operator demands. Thus, system overload is avoided, and further, a flexible tool is provided for satisfying operator demands. |
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DETAILED DESCRIPTION It is an object of the present invention to provide a spread-spectrum based cellular mobile radio system of the above kind allowing access or traffic control under interference conditions, inter alia.
To this end the spread-spectrum radio system according to the present invention is characterized in that the system comprises statistics based inter-zone interference establishing means for establishing inter-zone interference information introduced in a given zone per unit of traffic in another zone.
Thus, access control data are obtained for either semi-automatically or fully automatically controlling access of mobile radio stations to radio zones.
The present invention is based upon the insight that, for the purpose of access control, when using statistical methods, pair-wise interference introduced by mobile radio stations in a neighbouring radio zone or more remote radio zone with regard to a given radio zone can be decomposed from general interference measurements.
Such a control is not time-critical since using statistics requires many events to be significant.
The present invention is further based upon the insight that admitting too many mobile radio stations in one radio zone could cause an overload situation in a neighbouring radio zone, while intra-zone interference causes less interference problems when using a proper CDMA technique.
In an embodiment of the system according to the present invention, the interference per element is established as an average interference power in the given zone per unit of traffic in the other zone, the average interference power being decomposed with regard to the number of active mobile radio stations in the other zone.
Thus, an average interference contribution caused by mobile radio stations in one radio zone to a radio base station in another radio zone is achieved, obtained average interferences for all pairs of radio zones forming the interference matrix.
With an increasing number of mobile radio stations per radio zone the deviation of the interference signal from its average tends to zero
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Multiplexer-related 
