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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Change in MA List No. Reuse pattern for hopping carriers: So remaining 4 frequencies will be used selectively.
In this case all the sites should be considered as omni sites for planning frequency reuse. Motorola has defined an additional parameter, FHI.
FHI can be defined on a timeslot basis. Using very less frequencies for BCCH plan might result in poor quality on BCCH carrier and the advantages of having quality improvement on hopping carriers may be lost.
The hopping sequence algorithm takes HSN and FN as an input and the output of the hopping sequence generation is a Mobile Allocation Index MAI which is a number ranging from 0 to the number of frequencies in the MA-list subtracted by one.
HSN is set to 0 — This is the case of cyclic hopping. This scheme is very commonly used in Motorola networks. Plan for 1 x 1 plan. Super frame number T2: If HSN is zero, the frequency hopping sequence is cyclic, ie without changes. This reduction may fet compensated due ib improvement in quality of hopping carriers improvement in TCH assignment success rate.
Frequency Hopping – GSM
Separate BCCH plan is required to be made for that period. The MA-list is automatically generated if the baseband hopping is used. Retrieved from ” https: TEMS is one of the drive test tools that can be used for the purpose.
Following sectors were found to be degraded: If not, then your MAIO is the best possible way. For example, in two hopping sequences, if we have the same HSN and different MAIO, we guarantee that they never overlap, or in other words, are orthogonal.
Please help improve this article by adding citations to reliable sources. The power level and coverage were the same as it was gzm the Fixed plan.
There always exists a trade-off between BCCH and hopping plans. First, the definition of HSN: Premium quality termination for wholesale carriers with their own VoIP switch.
Hopping Issue (HSN and MAIO patterns)
mauo In the following sectors wehave observed that the Idle Channel Interference was very high during some parts of the peak hour. Well, first defining MAIO: The MA-list is a subset of the CA list. 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.
Planned events for implementation: However the new BCCH plan is made just from the 15 frequencies. What is Splitter and Combiner? They transmit dummy burst when BCCH frequency is not in the burst. This type of reuse is useful in urban areas, where capacity requirement is large. 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 hs types of hopping.
In this case, the DRCU would have fixed tuned transmitters combined either in low loss tuned combiners or hybrid combiners. Also, please check the max.
Mobile Allocation Index Offset
The value of FHI varies between 0 to 3. This problem is not visible on field but it results in degradation in HSR.
Related Posts What is Envelope Tracking? Rate this Content 4. 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. 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.
The results are dependent on the traffic loading carried during the drive and also on the quality of BCCH or the hopping carriers. Other messages Other messages: The reason is to avoid continuous interference from BCCH carriers.