How to Plan MAIO and HSN – Download as Word Doc .doc), PDF File .pdf), Text File .txt) 8 OMO BSC GSM V9R11R12R13 Frequency Hopping. A mobile allocation index offset (MAIO) refers a time delay separating traffic channels. When a Thus, the MA Table, MAIO and the Hopping Sequence Number (HSN) completely configure a hopping sequence procedure GSM standard. View Test Prep – Frequency hopping from ECE at D A V College Cheeka. What is HSN and MAIO in GSM? – + February S M T W T F.
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The advantage of this scheme is it provides better isolation between sites using same hopping frequencies.
Combination of DTx and multiframes. Cell Broadcast Facility j. BCCH carrier is very important for logging on to the network or staying in the network. It has to be changed on a case to case basis. Conventionally there are 3 main reuse patterns followed for hopping frequencies. Defines a hopping system, made up by an associated set of frequencies MA to hop over and sequence of hopping HSN. But then interference from BCCH 48 must be considered.
MAIO is used on per carrier basis to provide offset for starting frequency in hopping sequence and avoid hits among carriers of the site.
Further details regarding FHI planning are discussed later in the document. This may result in quality degradation. The reason is to avoid continuous interference from BCCH carriers. What is Splitter and Combiner? NBCCH full power in hopping environment q.
Gdm is possible to define all 4 FHIs in a single cell.
Mobile Allocation Index Offset
Channel 47, which is guard channel between hopping and non-hopping is used selectively, in an area where 46 is not in hopping sequence. The benefits of hopping increase if more frequencies are available for hopping.
Thus 1×3 hopping plan restricts carrier addition in sites that has carriers. Using the MA table and the MAIO, the mobile station will hop in the exact sequence as the cell in dedicated mode to achieve frequency diversity. Press the button to post your message.
First 15 channels from 32 to 46 is to be used as hopping frequencies. Also there is a plan to reserve these for micro cells. This mainly affects stationary or quasi-stationary mobiles.
Work of MA, HSN and MAIO in GSM |
No changes have been made in parameters that were working in fixed frequency plan. In sectors that have 3 NBCCH Carriers, it is observed that there is degradation in performance of surrounding sectors with inn MA list during the peak hours.
Otherwise, just understand that it is why we say that the Frequency Hopping somehow averages the interference across the network.
Implementtaion of 1 x 3 hopping plan in the network Monitoring Customer Complaints c. The traffic channels with the same HSN hop over the same frequencies in the same order but are separated in time by a mobile allocation index offset MAIO.
Since there are 5 frequencies in each sector, as per definition of loading factor, there can be only 2 NBCCH carriers equipped on each sector. JP Road V2 – both 4. If a network running with fixed frequency plan is switched over to BBH BCCH included in MA list without any frequency changes, significant quality improvement can be observed in the network.
Hopping Issue (HSN and MAIO patterns)
Reasons for such division are: Extended paging active, DTx enabled. Their operation differs in the way they establish the Base to Mobile Station link downlinkhowever there is not difference at all between Mobile Station to Base Station link in both qnd of hopping.
Alternatively, for the existing network quality additional capacity can be provided. But the BCCH plan for new maioo is more difficult. Call success rate will depend on the cleanliness of BCCH carriers. So come on and try to understand better This article provides insufficient context for those unfamiliar with the subject.