Consider the frequency spectrum allocation for the GSM network and determine the

Question

Consider the frequency spectrum allocation for the GSM network and determine the following: The cluster size N if the required signal to co-channel interference ratio from tier 1 interferes is 14 dB assuming a path loss exponent of 4. The number of channels per cell under the given S/I condition. The required number of base stations to cover an area of 312 square km assuming that each base station has 2 km coverage radius. Use the hexagonal cell layout model. The maximum number of simultaneous users in the network. The maximum number of simultaneous users in the network if S/I from tier 1 interferes is reduced to 10 dB. Compute the frequency reuse distance for both S/I cases.

Explanation / Answer

Cluster size N = T/K = 4

Here the bandwidth is given = 25000000 Hz = 25MHz

Signal to interference channel = 124

Using frequency reuse and umbrella cell concept 8 voice channel support.

Total no. of 156 user in the network.

Using frequency reuse concept f = 2Hz. For S/I = 1/10 = 0.1

And distance is 2 km.Because of Guard band present between 124 channel and frequency is 100 Khz.

Here time division multiplexing is used so frequency used in each slot is 8000 Hz.

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