Radio Cell Planning



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2G Cell planning

Frequency Hopping

  • Algorithm
    • At frequency hopping MAIO values are used (together with the HSN and the current FN) to point out the frequencies to be used from the HFS at an instant in time.
    • HFS : Hopping Frequency Set
    • Cyclic hopping
      • "pointer" = (MAIO+FN) modulo (number of frequencies in HFS)
    • Random hopping
      • "pointer" = (MAIO+ random value) modulo (number of frequencies in HFS)

Example

Cyclic hopping, 3 TRX:s in a cell, nine frequencies in the HFS. The current FN is 1.

The first TRX use frequency number:

(FN+MAIO) mod (# of frequencies in HFS) = (1+0) mod 9 = 1 (which will relate the pointer to the second frequency in the HFS

The next time FN=2 and the pointers will be shifted downwards one step.

0, 2, 4


Default MAIO list:

HFS

0

1

2

3

4

5

6

7

8

2

4

7

12

17

21

22

31

33

Pos.

4

2



0


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