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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Hopping sequence number T1: This plan needs to be done very carefully as the system monitors cells based on the BCCH frequency only. Drive test areawise — collection of drive data and anlaysis.
Mobile Allocation Index Offset – Wikipedia
However BBH without additional hardware will result in quality improvements and provide scope of additional capacity as compared to fixed frequency plan though the benefits may not be as significant as seen in SFH. Thus 1×3 hopping plan restricts carrier addition in sites that has carriers.
As a result, the decoding and de-interleaving processes can more effectively remove bit errors caused by bursts received whilst on fading frequencies errors will be randomly distributed instead of having long bursts of errors. No problems found 5. TCH multiframe number T3: Implementation of hopping plan on trial basis in Vashi BSC 7.
Change in MA List No. MA list is same for all the cells of the site — In this case HSN is kept same for all the cells of the site. This factor is a major distinguishing factor between 1 x 1 and 1 x 3. It did not help? Enable combined and non-combined multiframe. The frequency is changed on a per burst basis, which means that all the bits in a burst are transmitted in the same frequency. Due to the MA List gwm only 5 carriers and ysn due to the loading problem, further carriers cannot be added in the 1×3 Plan.
MA list is same for the cells of maoi sites — In this case HSN should be different for all such cells.
This article provides insufficient context for those unfamiliar with the subject. Further details regarding FHI planning are discussed later in the document.
Due to Rayleigh fading, short-term variations in received level are frequently observed. Hopping Sequence number there are 1 to 63 pseudorandom sequences used for interference reduction. Super frame number T2: The advantage of this scheme is it provides better isolation between sites using same hopping frequencies. The value of FHI varies between 0 to 3. 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.
In cases where there are large numbers of hits, MAIO change can be effective as it adds the offset in the hopping sequence and hit-rate can be reduced. Also it was observed that for files of size KB, the data transmission takes at a speed of 8KB to 8. Optimisation of BCCH plan. Please help improve the article with a good introductory style. Motorola has defined an additional parameter, FHI. Timeslot 0 of BCCH will not hop.
This is very useful to identify the change in any of the areas and the cause. It either carries traffic in timeslots 1 to 7 or it transmits dummy bursts. This is not recommended in the urban environment where frequency reuse is more. Frequency Hopping is mechanism in which the system changes the frequency uplink and downlink during transmission at regular intervals.
Frequency Hopping plan differs from the conventional fixed frequency plan. What is Splitter and Combiner? Maximum of 63 frequencies gms be defined in the MA list.
Mobile allocation offset 0 to N-1where N is the number of frequencies defined in MA. When a GSM Global System for Mobile Communications mobile phone is served by a cell that is hopping over a set of frequencies, the separate traffic channels hop over maioo allocated frequencies according to a hopping sequence number HSN.
This scheme is very commonly used in Motorola networks. It is presumed that addition of the site is very easy in SFH.
Mobile Allocation Index Offset
This reuse scheme is suitable for homogeneous network with minimum overlapping areas. Addition of Site e. The problem with this method is that, addition of new site may require frequency replan for the area. Other messages Other messages: Frequency Hopping — or FH: Tools for simulation and drive test: As a result of dynamic nature of the transmit frequency, broadband hybrid combining of the transmitters is necessary.