PDF- -Simulation of GSM Mobile Networks Planning Using ATOLL - How to Plan MAIO and HSN

Plan MAIO and HSN

Description

How to Plan MAIO and HSN For telecom engineers,

it is very help full to know about MAIO

Basically there is a set of frequencies where the channels are hop to avoid interference that set of frequencies is called MA-LIST

suppose MALIST contained frequencies [A,B,C,D,E,F,G,H,I,J,K,L]

#### Then MAIO corresponds the starting point of hopping sequence

suppose there are four TRx in one sector

• then MAIO will be,
• for example,
• for first TRx for traffic,
• the MAIO is 0

means that hopping sequence starts from first frequency in the MALIST,

• that is frequency A

and for MAIO 2 it starts from frequency C and for MAIO 4 it starts from frequency E

Also HSN (hopping sequence number),

• ranges from 0 to 63
• if we use HSN as,

for example 4 it means that for MAIO 0,

the sequence starts from frequency A and repeats frequencies in following manner

For MAIO 0 and HSN 4 A,F,K,D,I,B,G,L,E,J,C,H,A,F For MAIO 2 and HSN 4 C,H,A,F,K,D,I,B,G,L,E,J,C,H For MAIO 4 and HSN 4 E,J,C,H,A,F,K,D,I,B,G,L,E,J DEAR SHANKAR,

HSN:(Hopping Sequence number) there are 1 to 63 pseudorandom sequences used for interference reduction

MAIO:(Mobile Allocation Index Ofset) it basically decides the start of hopping in MA LIST Explanation with the help of Example: let say we are using frequency planning 1*3 which means one MA list for 3 sectors

MA list= (10,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26)mhz for e

g Now each sector will have different MAIO 1-e HoppingTrx trx1 trx2 trx3 sector1 0 2 4 sector2 6 8 10 sector3 12 14 16 NOTE: For every sector there are 4 trxs normally one for BCCH & rest of them are for hopping

• hsn=63 for e

This means for sector 1 frequency hopping will start from 10mhz and for sector 2 it will start from 17mhz and for sector 3 it will start from 23mhz

### The benefit of selecting these maio is,

hopping sequence will start from different frequencies coz of which there ll be a very less chance of facing interference and interference reduction is a important issue to be reduced

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