6 omp110070 gsm capacity dimensioning issue1.01

8/13/2019 6 OMP110070 GSM Capacity Dimensioning ISSUE1.01

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Capacity Dimensioning



The network construction requires the consideration of economic feasibility and rationality.Therefore, a reasonable investment decision must be based on the prediction of the

network capacity of the early and late stage.





In busy hr, the traffic of each subscriber is 0.025 Erl in urban areas and 0.020 Erl insuburban areas.





By Frequency Reuse: The type of frequency reuse is given. It decides max TRX number ofevery cell. By traffic prediction, calculate max user number per cell. According to the total

traffic and user number, Obtain site and cell number. By Max Coverage: By coverage planning, obtain the max coverage of one cell. By the total

area of whole network, calculate the required cell number. By traffic prediction, obtainthe traffic of every cell, then calculate the TRX number.





After the SDCCH dynamic adjustment process is triggered, dynamicadjustment can be started under the following conditions:

There should not be a resource check ongoing (usually at night during low traffic hour).

The BSC internal flow control level should be less than 0 (i.e. the BSC is not in overload).

Dynamic adjustment of other SDCCH in the cell should not be in progress (one conversion

at a time).

“SD Dynamic Allocation Allowed” should be “Yes” (feature enabled).

The number of the SDCCHs +8 should be less than “Cell SD Maximum”.

IF the number of the cell idle TCH/F + (the number of the cell idle TCH/H)/2 ≤ 4 AND ≤ the

number of the TRXs in the cell THEN the dynamic SDCCH adjustment is not allowed. ELSEallowed.

Then a suitable TCH/F should be selected for conversion. Parameter: Cell SD Maximum

Range:0~255

Default: Configured SDCCHs + 8 (i.e single dynamic)

Description: The maximum number of SDCCHs in the cell.

Parameter: SD Dynamic Allocation Allowed

Range: Yes, No

Default: Yes

Description: Indicates whether SDCCH dynamic allocation is allowed.





The estimation of the number of TCHFs and TCHHs in a cell paves the way for the properconfiguration of the TCHFs and TCHHs in the cell. Also, with the estimated proportion

between the TCHFs and TCHHs you can set the TCH Traffic Busy Threshold moreaccurately.





Co-BCCH cell, also has some other names:

1、Co-Cell

2、Multiband Cell

3、900/1800 mix cell





When the MS supports the frequencies of both the overlay and underlay cells, assign thechannel according to the channel assignment policy of the concentric cell. Otherwise,

assign the channel in the overlay cell only.



6 omp110070 gsm capacity dimensioning issue1.01

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