H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 7/26 (2006.01) H04Q 7/36 (2006.01)
Patent
CA 2046274
(57) Abstract The present invention relates to a method for planning radio cells. The method utilizes an exclusion matrix calculated on the basis of measured field strengths and an iterative allocating algorithm, which allows an adaptation of the cell planning to pre- vailing traffic demand. The method includes the following steps: the traffic demand is geographically estimated; an acceptable coverage of the traffic demand is produced with the aid of a number of cells with suitable transmitter powers and antenna ar- rangements; each cell is allocated a number of channels, which corresponds to the estimated traffic demand, having regard to a margin for acceptable blocking; coverage and interference measurements are carried out for the cells, which measurement results are stored in a measurement data base; an exclusion matrix is calculated on the basis of the measurement results, which matrix represents the interaction between the cells in the system; an allocating algorithm is iterated, which algorithm, by utilizing a ran- dom technique, provides different collections of channel allocations for the cells; if the channel allocation is not possible with re- gard to the number of channels in a given frequency band, a new attempt is made and the subsequent steps are repeated; if the number of channels was sufficiently high, a radio cell design is obtained which is acceptable from the point of view of interfer- ence and the point of view of blocking. The present invention also provides a method for constructing the exclusion matrix and a method for determining uplink interferences. . . _ .. ... _ __ . . .
Gunmar Krister
Tegth Ulf
Smart & Biggar
Televerket
LandOfFree
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