What should be the minimum distance kept between two co-channel cells in order to avoid any interference?

Solution

What will be maximum number of channels that the network can use at any given time?

Answer 2-a

Question – 1
Consider a network consisting of 3 clusters. Each cluster uses the frequency reuse parameters i=1 and j=3 to allocate frequency channel to the cells in the clusters. You are required to draw cell pattern showing all three clusters and label the co-channel cells with same name.

Cyberian Solution

Question – 2
Consider a situation where a cellular network is allocated 300 duplex channels to provide network services in a service region. The company decides to replicate the clusters 10 times and uses a frequency reuse factor of 12. The radius of each cell will be 2 miles. For the given scenario, answer the following questions:

What will be maximum number of channels that the network can use at any given time?
What should be the minimum distance kept between two co-channel cells in order to avoid any interference?

Answer:

Co-channels cells distance(D)= 12
Radius of the cell = 2
K = 12
D/R= √3K 》1/12÷2=√3(12) 》6 = 6
Minimum distance = 6

Question – 1
Consider a network consisting of 3 clusters. Each cluster uses the frequency reuse parameters i=1 and j=3 to allocate frequency channel to the cells in the clusters. You are required to draw cell pattern showing all three clusters and label the co-channel cells with same name.

Answer:

Cell cluster  size K= 12
Frequency reuse factor = 1/12
No. of duplex channels (T)=300
Total channels (N) = T/K 》300/12 = 25 channels per cell 
K=12 , N= 25 Channels/cell
Cluster are replicated M= 10 , T=300
System  capacity = M×T 》10 ×300 =3000 Total Channels