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Laboratory work # 1
Theme: Study of general principles of mobile communication systems
Purpose of work: to study the basic principles of mobile networks. To
study the principle of organization of mobile networks based on the subsystem
of GSM-900 base stations.
Perform territorial-frequency planning of the subsystem of base
stations of
GSM-900 network in a given territory. The territory is an urban development,
divided into two zones: Central and peripheral. For each zone, the radius R, the
number of subscribers N in the PLH, the load from one subscriber Y in the PLH
are given. The following limitations must be considered in the calculation. peak
load hour:
• 27 frequency channels are allocated for the
implementation of the system,
• the probability of call blocking is 5%,
• in the cluster are combined 3-4 cells,
• each cell is divided into 3 sectors,
• radius of cells in urban areas 0.4-6 km,
• the efficiency of the frequency channel should be 70-100%.
It is necessary to calculate the number of cells in the system, the number of
frequency channels in the cell, to assign frequencies in the cluster.
It is also necessary to calculate the amount of BSS equipment, using Huawei
equipment in the construction of the network.
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