Our network is entirely Ericsson and use hopping in Urban areas. We have only 3 sector sites. We use only 3 MAIO numbers for a cell. We use this pattern in entire hopping sites.
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Our network is entirely Ericsson and use hopping in Urban areas. We have only 3 sector sites. We use only 3 MAIO numbers for a cell. We use this pattern in entire hopping sites. Of course you need one frequency list. To get a better understanding, if we use 2 frequency lists then what should be the changes in MAIOs? So MAIO values will be same at each sector ex: 0,2,4, Shankerkanaka gmail. HSN: Hopping Sequence number there are 1 to 63 pseudorandom sequences used for interference reduction.
HoppingTrx trx1 trx2 trx3 sector1 0 2 4 sector2 6 8 10 sector3 12 14 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.
If not, then your MAIO is the best possible way. The interference will not be due to MAIO. Also, please check the max.
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Generic selectors. Exact matches only. Search in title. Search in content. Search in excerpt. Search in posts. Search in pages. This topic has 17 replies, 1 voice, and was last updated 9 years, 3 months ago by M. Viewing 15 posts - 1 through 15 of 18 total. Mahesh Guest. But we experience heavy interference only in hopping channel group.
Is this senario is OK? Tomar Guest. Hi Mahesh, are you using Hopping 1by1 or 1by3? BR Tomar. Dear Tomar, What did you mean by 1by1 and 1by3? Sorry I havent heared these terms before. Anyway we use 3 MAIO numbers for a cell. That means 9 MAIO numbers for a 3 sector site. BR Mahesh. Simanullang Guest. Thanks again Simanullang. In our case following configuration is suitable, isnt it? This is just to clarify your answer.
Ok Simanullang, I will try this configuration in our network and tell you the results. Shanker Kanaka Guest. Neeraj Singh Guest. Brother Guest. MAIO is just a start number take it like this, it is simply an offset of trx to start hopping. Prabeen Guest.
How to Plan MAIO and HSN
Necessary info is as follows:. I have 30 frequencies. I reserved 12 of them for BCCH,and divided the remaining into 3 frequency groups. I guess above configuration will work.
Hopping Issue (HSN and MAIO patterns)
What is Frequency Hopping? Frequency Hopping is an old technique introduced firstly in military transmission system to ensure the secrecy of communications and combat jamming. Frequency Hopping is mechanism in which the system changes the frequency uplink and downlink during transmission at regular intervals. The frequency is changed on a per burst basis, which means that all the bits in a burst are transmitted in the same frequency.
HSN and MAIO planning in a 1/3 Network
Note: The goal here is not to teach HSN and MAIO planning, since this task involves many possible configurations and scenarios, which would escape the scope of our tutorial. Frequency Hopping — or FH : one of the great advantages of the GSM system, in the constant search to reduce interference. More on the FH due to a new tutorial. MA List : set of frequencies channels assigned to a particular sector, ie are those channels that can be used to attend calls from users. It is a number that defines the frequency hopping algorithm, and can vary from 0 to 63, ie there are 64 hopping algorithms to be used in GSM. In our example, the MA List is small - just three frequencies. It is the frequency that TRX uses so get hopping.