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Method for determining the spatial distribution of the traffic volume within a mobile radio communications network
| Details |
Inventors: Collmann, Ralf;
Assignee: Alcatel (Paris, FR)
Primary Examiner: Urban; Edward F.
Assistant Examiner: Gesesse; Tilahun
Attorney, Agent or Firm: Ware, Fressola, Van Der Sluys & Adolphson LLP, Oliver; Milton
For determining the spatial distribution of the traffic volume within a radio cell of a cellular mobile radio communications network, a test signal transmitter is usually installed at a test location. Each mobile station which receives the test signal, measures and reports the receive level to a computer for evaluating the test location. The test location is deemed to be suitable for the installation of a new base station if the majority of the mobile stations receives a test signal of sufficient strength. In order to provide a simple method for determining the spatial distribution, it is proposed to first subdivide the radio cell (RC1) into several segments or sections (A1, A2, A3, . . . , D4) and to associated respective reference values (e.g. reference receive levels) with these segments or sections. The reference values are calculated with the help of a Radio Communications Network Planning Tool, wherein the distances from the segment or section (C2) to at least two of the base stations (BS1, BS2) can be derived from the reference values. Subsequently, measured values (e.g. the actual receive level) which depend on the length of the radio transmission paths, are determined for each mobile station (MS). After the reference values are compared with the actual values, the respective segment or section (C2) in which the mobile station (MS) is currently located, is determined. A counter state indicating the traffic volume in this segment or section (C2) is then incremented for this segment (C2). A test signal transmitter is not required, because that section (C2) of the cell which has the highest count state, representing the highest traffic volume, has been shown to be a desirable location for a reliever base station, without having to put a test transmitter there. |
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DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS FIG.
1a illustrates schematically the organization of a cellular mobile radio communications network MRN comprising several radio cells RC1 to RC3 which are serviced by base stations BS1 to BS3.
The base stations are connected to a computation unit COMP which will be described below and which is connected to a database DB.
It is the object to determine the spatial distribution of the traffic volume within the radio cell RC1.
At this moment, several mobile stations are located in the radio cell RC1, which is serviced by the base station BS1, with only one of the mobile stations MS illustrated as an example.
In order to determine the number and the exact location of mobile stations located within the radio cell RC1, the radio cell RC1 is subdivided into several segments.
In FIG.
1a, there is shown by way of example a group of segments SG which consists of 16 grid squares, each side of a square having a length of d=20 m.
Accordingly, in the present example, the radio cell RC1 which in general has a diameter of about 15 to 30 km, is subdivided into small grid squares, with each grid square only covering an area of 20 m.
times.
20 m.
The group of grid squares SG is denoted in FIG.
1a by dashed lines and covers only a portion of the area of the entire radio cell RC1.
As shown in FIG.
1b, the group of segments SG consists of the following segments: A1 to A4, B1 to B4, C1 to C4 and D1 to D4.
The segments in this example have the shape of squares and are therefore also called grid squares A1 to D4.
Other shapes are also feasible, such as a honeycomb shape.
In the following, the grid square C2 will be considered more closely: With the grid square C2, as with any other grid square, there is associated a reference data set comprising at least two reference values which are stored in the database DB.
The reference values are determined with the help of a computer which contains a program for planning a radio communications network.
Computers of this type are known to the artisan under the name "Radio Communications Network Planning Tools"
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Telecommunications 
